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sys/netinet6/ip6_output.c
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1 /* $FreeBSD$ */ 2 /* $KAME: ip6_output.c,v 1.279 2002/01/26 06:12:30 jinmei Exp $ */ 3 4 /*- 5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the project nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 /*- 34 * Copyright (c) 1982, 1986, 1988, 1990, 1993 35 * The Regents of the University of California. All rights reserved. 36 * 37 * Redistribution and use in source and binary forms, with or without 38 * modification, are permitted provided that the following conditions 39 * are met: 40 * 1. Redistributions of source code must retain the above copyright 41 * notice, this list of conditions and the following disclaimer. 42 * 2. Redistributions in binary form must reproduce the above copyright 43 * notice, this list of conditions and the following disclaimer in the 44 * documentation and/or other materials provided with the distribution. 45 * 4. Neither the name of the University nor the names of its contributors 46 * may be used to endorse or promote products derived from this software 47 * without specific prior written permission. 48 * 49 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 50 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 51 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 52 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 53 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 54 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 55 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 56 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 57 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 58 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 59 * SUCH DAMAGE. 60 * 61 * @(#)ip_output.c 8.3 (Berkeley) 1/21/94 62 */ 63 64 #include "opt_ip6fw.h" 65 #include "opt_inet.h" 66 #include "opt_inet6.h" 67 #include "opt_ipsec.h" 68 69 #include <sys/param.h> 70 #include <sys/malloc.h> 71 #include <sys/mbuf.h> 72 #include <sys/proc.h> 73 #include <sys/errno.h> 74 #include <sys/protosw.h> 75 #include <sys/socket.h> 76 #include <sys/socketvar.h> 77 #include <sys/systm.h> 78 #include <sys/kernel.h> 79 80 #include <net/if.h> 81 #include <net/route.h> 82 #include <net/pfil.h> 83 84 #include <netinet/in.h> 85 #include <netinet/in_var.h> 86 #include <netinet6/in6_var.h> 87 #include <netinet/ip6.h> 88 #include <netinet/icmp6.h> 89 #include <netinet6/ip6_var.h> 90 #include <netinet/in_pcb.h> 91 #include <netinet/tcp_var.h> 92 #include <netinet6/nd6.h> 93 94 #ifdef IPSEC 95 #include <netinet6/ipsec.h> 96 #ifdef INET6 97 #include <netinet6/ipsec6.h> 98 #endif 99 #include <netkey/key.h> 100 #endif /* IPSEC */ 101 102 #ifdef FAST_IPSEC 103 #include <netipsec/ipsec.h> 104 #include <netipsec/ipsec6.h> 105 #include <netipsec/key.h> 106 #endif /* FAST_IPSEC */ 107 108 #include <netinet6/ip6_fw.h> 109 110 #include <net/net_osdep.h> 111 112 #include <netinet6/ip6protosw.h> 113 114 static MALLOC_DEFINE(M_IPMOPTS, "ip6_moptions", "internet multicast options"); 115 116 struct ip6_exthdrs { 117 struct mbuf *ip6e_ip6; 118 struct mbuf *ip6e_hbh; 119 struct mbuf *ip6e_dest1; 120 struct mbuf *ip6e_rthdr; 121 struct mbuf *ip6e_dest2; 122 }; 123 124 static int ip6_pcbopt __P((int, u_char *, int, struct ip6_pktopts **, 125 int, int)); 126 static int ip6_pcbopts __P((struct ip6_pktopts **, struct mbuf *, 127 struct socket *, struct sockopt *)); 128 static int ip6_getpcbopt __P((struct ip6_pktopts *, int, struct sockopt *)); 129 static int ip6_setpktopt __P((int, u_char *, int, struct ip6_pktopts *, int, 130 int, int, int)); 131 132 static int ip6_setmoptions __P((int, struct ip6_moptions **, struct mbuf *)); 133 static int ip6_getmoptions __P((int, struct ip6_moptions *, struct mbuf **)); 134 static int ip6_copyexthdr __P((struct mbuf **, caddr_t, int)); 135 static int ip6_insertfraghdr __P((struct mbuf *, struct mbuf *, int, 136 struct ip6_frag **)); 137 static int ip6_insert_jumboopt __P((struct ip6_exthdrs *, u_int32_t)); 138 static int ip6_splithdr __P((struct mbuf *, struct ip6_exthdrs *)); 139 static int ip6_getpmtu __P((struct route_in6 *, struct route_in6 *, 140 struct ifnet *, struct in6_addr *, u_long *, int *)); 141 142 143 /* 144 * IP6 output. The packet in mbuf chain m contains a skeletal IP6 145 * header (with pri, len, nxt, hlim, src, dst). 146 * This function may modify ver and hlim only. 147 * The mbuf chain containing the packet will be freed. 148 * The mbuf opt, if present, will not be freed. 149 * 150 * type of "mtu": rt_rmx.rmx_mtu is u_long, ifnet.ifr_mtu is int, and 151 * nd_ifinfo.linkmtu is u_int32_t. so we use u_long to hold largest one, 152 * which is rt_rmx.rmx_mtu. 153 */ 154 int 155 ip6_output(m0, opt, ro, flags, im6o, ifpp, inp) 156 struct mbuf *m0; 157 struct ip6_pktopts *opt; 158 struct route_in6 *ro; 159 int flags; 160 struct ip6_moptions *im6o; 161 struct ifnet **ifpp; /* XXX: just for statistics */ 162 struct inpcb *inp; 163 { 164 struct ip6_hdr *ip6, *mhip6; 165 struct ifnet *ifp, *origifp; 166 struct mbuf *m = m0; 167 int hlen, tlen, len, off; 168 struct route_in6 ip6route; 169 struct sockaddr_in6 *dst; 170 int error = 0; 171 struct in6_ifaddr *ia = NULL; 172 u_long mtu; 173 int alwaysfrag, dontfrag; 174 u_int32_t optlen = 0, plen = 0, unfragpartlen = 0; 175 struct ip6_exthdrs exthdrs; 176 struct in6_addr finaldst; 177 struct route_in6 *ro_pmtu = NULL; 178 int hdrsplit = 0; 179 int needipsec = 0; 180 #if defined(IPSEC) || defined(FAST_IPSEC) 181 int needipsectun = 0; 182 struct secpolicy *sp = NULL; 183 #endif /*IPSEC || FAST_IPSEC*/ 184 185 ip6 = mtod(m, struct ip6_hdr *); 186 finaldst = ip6->ip6_dst; 187 188 #define MAKE_EXTHDR(hp, mp) \ 189 do { \ 190 if (hp) { \ 191 struct ip6_ext *eh = (struct ip6_ext *)(hp); \ 192 error = ip6_copyexthdr((mp), (caddr_t)(hp), \ 193 ((eh)->ip6e_len + 1) << 3); \ 194 if (error) \ 195 goto freehdrs; \ 196 } \ 197 } while (/*CONSTCOND*/ 0) 198 199 bzero(&exthdrs, sizeof(exthdrs)); 200 201 if (opt) { 202 /* Hop-by-Hop options header */ 203 MAKE_EXTHDR(opt->ip6po_hbh, &exthdrs.ip6e_hbh); 204 /* Destination options header(1st part) */ 205 if (opt->ip6po_rthdr) { 206 /* 207 * Destination options header(1st part) 208 * This only makes sence with a routing header. 209 * See Section 9.2 of RFC 3542. 210 * Disabling this part just for MIP6 convenience is 211 * a bad idea. We need to think carefully about a 212 * way to make the advanced API coexist with MIP6 213 * options, which might automatically be inserted in 214 * the kernel. 215 */ 216 MAKE_EXTHDR(opt->ip6po_dest1, &exthdrs.ip6e_dest1); 217 } 218 /* Routing header */ 219 MAKE_EXTHDR(opt->ip6po_rthdr, &exthdrs.ip6e_rthdr); 220 /* Destination options header(2nd part) */ 221 MAKE_EXTHDR(opt->ip6po_dest2, &exthdrs.ip6e_dest2); 222 } 223 224 #ifdef IPSEC 225 /* get a security policy for this packet */ 226 if (inp == NULL) 227 sp = ipsec6_getpolicybyaddr(m, IPSEC_DIR_OUTBOUND, 0, &error); 228 else 229 sp = ipsec6_getpolicybypcb(m, IPSEC_DIR_OUTBOUND, inp, &error); 230 231 if (sp == NULL) { 232 ipsec6stat.out_inval++; 233 goto freehdrs; 234 } 235 236 error = 0; 237 238 /* check policy */ 239 switch (sp->policy) { 240 case IPSEC_POLICY_DISCARD: 241 /* 242 * This packet is just discarded. 243 */ 244 ipsec6stat.out_polvio++; 245 goto freehdrs; 246 247 case IPSEC_POLICY_BYPASS: 248 case IPSEC_POLICY_NONE: 249 /* no need to do IPsec. */ 250 needipsec = 0; 251 break; 252 253 case IPSEC_POLICY_IPSEC: 254 if (sp->req == NULL) { 255 /* acquire a policy */ 256 error = key_spdacquire(sp); 257 goto freehdrs; 258 } 259 needipsec = 1; 260 break; 261 262 case IPSEC_POLICY_ENTRUST: 263 default: 264 printf("ip6_output: Invalid policy found. %d\n", sp->policy); 265 } 266 #endif /* IPSEC */ 267 #ifdef FAST_IPSEC 268 /* get a security policy for this packet */ 269 if (inp == NULL) 270 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_OUTBOUND, 0, &error); 271 else 272 sp = ipsec_getpolicybysock(m, IPSEC_DIR_OUTBOUND, inp, &error); 273 274 if (sp == NULL) { 275 newipsecstat.ips_out_inval++; 276 goto freehdrs; 277 } 278 279 error = 0; 280 281 /* check policy */ 282 switch (sp->policy) { 283 case IPSEC_POLICY_DISCARD: 284 /* 285 * This packet is just discarded. 286 */ 287 newipsecstat.ips_out_polvio++; 288 goto freehdrs; 289 290 case IPSEC_POLICY_BYPASS: 291 case IPSEC_POLICY_NONE: 292 /* no need to do IPsec. */ 293 needipsec = 0; 294 break; 295 296 case IPSEC_POLICY_IPSEC: 297 if (sp->req == NULL) { 298 /* acquire a policy */ 299 error = key_spdacquire(sp); 300 goto freehdrs; 301 } 302 needipsec = 1; 303 break; 304 305 case IPSEC_POLICY_ENTRUST: 306 default: 307 printf("ip6_output: Invalid policy found. %d\n", sp->policy); 308 } 309 #endif /* FAST_IPSEC */ 310 311 /* 312 * Calculate the total length of the extension header chain. 313 * Keep the length of the unfragmentable part for fragmentation. 314 */ 315 optlen = 0; 316 if (exthdrs.ip6e_hbh) optlen += exthdrs.ip6e_hbh->m_len; 317 if (exthdrs.ip6e_dest1) optlen += exthdrs.ip6e_dest1->m_len; 318 if (exthdrs.ip6e_rthdr) optlen += exthdrs.ip6e_rthdr->m_len; 319 unfragpartlen = optlen + sizeof(struct ip6_hdr); 320 /* NOTE: we don't add AH/ESP length here. do that later. */ 321 if (exthdrs.ip6e_dest2) optlen += exthdrs.ip6e_dest2->m_len; 322 323 /* 324 * If we need IPsec, or there is at least one extension header, 325 * separate IP6 header from the payload. 326 */ 327 if ((needipsec || optlen) && !hdrsplit) { 328 if ((error = ip6_splithdr(m, &exthdrs)) != 0) { 329 m = NULL; 330 goto freehdrs; 331 } 332 m = exthdrs.ip6e_ip6; 333 hdrsplit++; 334 } 335 336 /* adjust pointer */ 337 ip6 = mtod(m, struct ip6_hdr *); 338 339 /* adjust mbuf packet header length */ 340 m->m_pkthdr.len += optlen; 341 plen = m->m_pkthdr.len - sizeof(*ip6); 342 343 /* If this is a jumbo payload, insert a jumbo payload option. */ 344 if (plen > IPV6_MAXPACKET) { 345 if (!hdrsplit) { 346 if ((error = ip6_splithdr(m, &exthdrs)) != 0) { 347 m = NULL; 348 goto freehdrs; 349 } 350 m = exthdrs.ip6e_ip6; 351 hdrsplit++; 352 } 353 /* adjust pointer */ 354 ip6 = mtod(m, struct ip6_hdr *); 355 if ((error = ip6_insert_jumboopt(&exthdrs, plen)) != 0) 356 goto freehdrs; 357 ip6->ip6_plen = 0; 358 } else 359 ip6->ip6_plen = htons(plen); 360 361 /* 362 * Concatenate headers and fill in next header fields. 363 * Here we have, on "m" 364 * IPv6 payload 365 * and we insert headers accordingly. Finally, we should be getting: 366 * IPv6 hbh dest1 rthdr ah* [esp* dest2 payload] 367 * 368 * during the header composing process, "m" points to IPv6 header. 369 * "mprev" points to an extension header prior to esp. 370 */ 371 { 372 u_char *nexthdrp = &ip6->ip6_nxt; 373 struct mbuf *mprev = m; 374 375 /* 376 * we treat dest2 specially. this makes IPsec processing 377 * much easier. the goal here is to make mprev point the 378 * mbuf prior to dest2. 379 * 380 * result: IPv6 dest2 payload 381 * m and mprev will point to IPv6 header. 382 */ 383 if (exthdrs.ip6e_dest2) { 384 if (!hdrsplit) 385 panic("assumption failed: hdr not split"); 386 exthdrs.ip6e_dest2->m_next = m->m_next; 387 m->m_next = exthdrs.ip6e_dest2; 388 *mtod(exthdrs.ip6e_dest2, u_char *) = ip6->ip6_nxt; 389 ip6->ip6_nxt = IPPROTO_DSTOPTS; 390 } 391 392 #define MAKE_CHAIN(m, mp, p, i)\ 393 do {\ 394 if (m) {\ 395 if (!hdrsplit) \ 396 panic("assumption failed: hdr not split"); \ 397 *mtod((m), u_char *) = *(p);\ 398 *(p) = (i);\ 399 p = mtod((m), u_char *);\ 400 (m)->m_next = (mp)->m_next;\ 401 (mp)->m_next = (m);\ 402 (mp) = (m);\ 403 }\ 404 } while (/*CONSTCOND*/ 0) 405 /* 406 * result: IPv6 hbh dest1 rthdr dest2 payload 407 * m will point to IPv6 header. mprev will point to the 408 * extension header prior to dest2 (rthdr in the above case). 409 */ 410 MAKE_CHAIN(exthdrs.ip6e_hbh, mprev, nexthdrp, IPPROTO_HOPOPTS); 411 MAKE_CHAIN(exthdrs.ip6e_dest1, mprev, nexthdrp, 412 IPPROTO_DSTOPTS); 413 MAKE_CHAIN(exthdrs.ip6e_rthdr, mprev, nexthdrp, 414 IPPROTO_ROUTING); 415 416 #if defined(IPSEC) || defined(FAST_IPSEC) 417 if (!needipsec) 418 goto skip_ipsec2; 419 420 /* 421 * pointers after IPsec headers are not valid any more. 422 * other pointers need a great care too. 423 * (IPsec routines should not mangle mbufs prior to AH/ESP) 424 */ 425 exthdrs.ip6e_dest2 = NULL; 426 427 { 428 struct ip6_rthdr *rh = NULL; 429 int segleft_org = 0; 430 struct ipsec_output_state state; 431 432 if (exthdrs.ip6e_rthdr) { 433 rh = mtod(exthdrs.ip6e_rthdr, struct ip6_rthdr *); 434 segleft_org = rh->ip6r_segleft; 435 rh->ip6r_segleft = 0; 436 } 437 438 bzero(&state, sizeof(state)); 439 state.m = m; 440 error = ipsec6_output_trans(&state, nexthdrp, mprev, sp, flags, 441 &needipsectun); 442 m = state.m; 443 if (error) { 444 /* mbuf is already reclaimed in ipsec6_output_trans. */ 445 m = NULL; 446 switch (error) { 447 case EHOSTUNREACH: 448 case ENETUNREACH: 449 case EMSGSIZE: 450 case ENOBUFS: 451 case ENOMEM: 452 break; 453 default: 454 printf("ip6_output (ipsec): error code %d\n", error); 455 /* FALLTHROUGH */ 456 case ENOENT: 457 /* don't show these error codes to the user */ 458 error = 0; 459 break; 460 } 461 goto bad; 462 } 463 if (exthdrs.ip6e_rthdr) { 464 /* ah6_output doesn't modify mbuf chain */ 465 rh->ip6r_segleft = segleft_org; 466 } 467 } 468 skip_ipsec2:; 469 #endif 470 } 471 472 /* 473 * If there is a routing header, replace the destination address field 474 * with the first hop of the routing header. 475 */ 476 if (exthdrs.ip6e_rthdr) { 477 struct ip6_rthdr *rh = 478 (struct ip6_rthdr *)(mtod(exthdrs.ip6e_rthdr, 479 struct ip6_rthdr *)); 480 struct ip6_rthdr0 *rh0; 481 struct in6_addr *addrs; 482 483 switch (rh->ip6r_type) { 484 case IPV6_RTHDR_TYPE_0: 485 rh0 = (struct ip6_rthdr0 *)rh; 486 addrs = (struct in6_addr *)(rh0 + 1); 487 488 ip6->ip6_dst = *addrs; 489 bcopy((caddr_t)(addrs + 1), (caddr_t)addrs, 490 sizeof(struct in6_addr)*(rh0->ip6r0_segleft - 1) 491 ); 492 *(addrs + rh0->ip6r0_segleft - 1) = finaldst; 493 break; 494 default: /* is it possible? */ 495 error = EINVAL; 496 goto bad; 497 } 498 } 499 500 /* Source address validation */ 501 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) && 502 (flags & IPV6_DADOUTPUT) == 0) { 503 error = EOPNOTSUPP; 504 ip6stat.ip6s_badscope++; 505 goto bad; 506 } 507 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src)) { 508 error = EOPNOTSUPP; 509 ip6stat.ip6s_badscope++; 510 goto bad; 511 } 512 513 ip6stat.ip6s_localout++; 514 515 /* 516 * Route packet. 517 */ 518 if (ro == 0) { 519 ro = &ip6route; 520 bzero((caddr_t)ro, sizeof(*ro)); 521 } 522 ro_pmtu = ro; 523 if (opt && opt->ip6po_rthdr) 524 ro = &opt->ip6po_route; 525 dst = (struct sockaddr_in6 *)&ro->ro_dst; 526 527 /* 528 * If there is a cached route, 529 * check that it is to the same destination 530 * and is still up. If not, free it and try again. 531 */ 532 if (ro->ro_rt && ((ro->ro_rt->rt_flags & RTF_UP) == 0 || 533 dst->sin6_family != AF_INET6 || 534 !IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &ip6->ip6_dst))) { 535 RTFREE(ro->ro_rt); 536 ro->ro_rt = (struct rtentry *)0; 537 } 538 if (ro->ro_rt == 0) { 539 bzero(dst, sizeof(*dst)); 540 dst->sin6_family = AF_INET6; 541 dst->sin6_len = sizeof(struct sockaddr_in6); 542 dst->sin6_addr = ip6->ip6_dst; 543 } 544 545 /* 546 * if specified, try to fill in the traffic class field. 547 * do not override if a non-zero value is already set. 548 * we check the diffserv field and the ecn field separately. 549 */ 550 if (opt && opt->ip6po_tclass >= 0) { 551 int mask = 0; 552 553 if ((ip6->ip6_flow & htonl(0xfc << 20)) == 0) 554 mask |= 0xfc; 555 if ((ip6->ip6_flow & htonl(0x03 << 20)) == 0) 556 mask |= 0x03; 557 if (mask != 0) 558 ip6->ip6_flow |= htonl((opt->ip6po_tclass & mask) << 20); 559 } 560 561 /* fill in or override the hop limit field, if necessary. */ 562 if (opt && opt->ip6po_hlim != -1) 563 ip6->ip6_hlim = opt->ip6po_hlim & 0xff; 564 else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 565 if (im6o != NULL) 566 ip6->ip6_hlim = im6o->im6o_multicast_hlim; 567 else 568 ip6->ip6_hlim = ip6_defmcasthlim; 569 } 570 571 #if defined(IPSEC) || defined(FAST_IPSEC) 572 if (needipsec && needipsectun) { 573 struct ipsec_output_state state; 574 575 /* 576 * All the extension headers will become inaccessible 577 * (since they can be encrypted). 578 * Don't panic, we need no more updates to extension headers 579 * on inner IPv6 packet (since they are now encapsulated). 580 * 581 * IPv6 [ESP|AH] IPv6 [extension headers] payload 582 */ 583 bzero(&exthdrs, sizeof(exthdrs)); 584 exthdrs.ip6e_ip6 = m; 585 586 bzero(&state, sizeof(state)); 587 state.m = m; 588 state.ro = (struct route *)ro; 589 state.dst = (struct sockaddr *)dst; 590 591 error = ipsec6_output_tunnel(&state, sp, flags); 592 593 m = state.m; 594 ro = (struct route_in6 *)state.ro; 595 dst = (struct sockaddr_in6 *)state.dst; 596 if (error) { 597 /* mbuf is already reclaimed in ipsec6_output_tunnel. */ 598 m0 = m = NULL; 599 m = NULL; 600 switch (error) { 601 case EHOSTUNREACH: 602 case ENETUNREACH: 603 case EMSGSIZE: 604 case ENOBUFS: 605 case ENOMEM: 606 break; 607 default: 608 printf("ip6_output (ipsec): error code %d\n", error); 609 /* FALLTHROUGH */ 610 case ENOENT: 611 /* don't show these error codes to the user */ 612 error = 0; 613 break; 614 } 615 goto bad; 616 } 617 618 exthdrs.ip6e_ip6 = m; 619 } 620 #endif /* IPSEC */ 621 622 if (!IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 623 /* Unicast */ 624 625 #define ifatoia6(ifa) ((struct in6_ifaddr *)(ifa)) 626 #define sin6tosa(sin6) ((struct sockaddr *)(sin6)) 627 /* xxx 628 * interface selection comes here 629 * if an interface is specified from an upper layer, 630 * ifp must point it. 631 */ 632 if (ro->ro_rt == 0) { 633 /* 634 * non-bsdi always clone routes, if parent is 635 * PRF_CLONING. 636 */ 637 rtalloc((struct route *)ro); 638 } 639 if (ro->ro_rt == 0) { 640 ip6stat.ip6s_noroute++; 641 error = EHOSTUNREACH; 642 /* XXX in6_ifstat_inc(ifp, ifs6_out_discard); */ 643 goto bad; 644 } 645 /* XXX rt not locked */ 646 ia = ifatoia6(ro->ro_rt->rt_ifa); 647 ifp = ro->ro_rt->rt_ifp; 648 ro->ro_rt->rt_rmx.rmx_pksent++; 649 if (ro->ro_rt->rt_flags & RTF_GATEWAY) 650 dst = (struct sockaddr_in6 *)ro->ro_rt->rt_gateway; 651 m->m_flags &= ~(M_BCAST | M_MCAST); /* just in case */ 652 653 in6_ifstat_inc(ifp, ifs6_out_request); 654 655 /* 656 * Check if the outgoing interface conflicts with 657 * the interface specified by ifi6_ifindex (if specified). 658 * Note that loopback interface is always okay. 659 * (this may happen when we are sending a packet to one of 660 * our own addresses.) 661 */ 662 if (opt && opt->ip6po_pktinfo 663 && opt->ip6po_pktinfo->ipi6_ifindex) { 664 if (!(ifp->if_flags & IFF_LOOPBACK) 665 && ifp->if_index != opt->ip6po_pktinfo->ipi6_ifindex) { 666 ip6stat.ip6s_noroute++; 667 in6_ifstat_inc(ifp, ifs6_out_discard); 668 error = EHOSTUNREACH; 669 goto bad; 670 } 671 } 672 673 if (opt && opt->ip6po_hlim != -1) 674 ip6->ip6_hlim = opt->ip6po_hlim & 0xff; 675 } else { 676 /* Multicast */ 677 struct in6_multi *in6m; 678 679 m->m_flags = (m->m_flags & ~M_BCAST) | M_MCAST; 680 681 /* 682 * See if the caller provided any multicast options 683 */ 684 ifp = NULL; 685 if (im6o != NULL) { 686 ip6->ip6_hlim = im6o->im6o_multicast_hlim; 687 if (im6o->im6o_multicast_ifp != NULL) 688 ifp = im6o->im6o_multicast_ifp; 689 } else 690 ip6->ip6_hlim = ip6_defmcasthlim; 691 692 /* 693 * See if the caller provided the outgoing interface 694 * as an ancillary data. 695 * Boundary check for ifindex is assumed to be already done. 696 */ 697 if (opt && opt->ip6po_pktinfo && opt->ip6po_pktinfo->ipi6_ifindex) 698 ifp = ifnet_byindex(opt->ip6po_pktinfo->ipi6_ifindex); 699 700 /* 701 * If the destination is a node-local scope multicast, 702 * the packet should be loop-backed only. 703 */ 704 if (IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst)) { 705 /* 706 * If the outgoing interface is already specified, 707 * it should be a loopback interface. 708 */ 709 if (ifp && (ifp->if_flags & IFF_LOOPBACK) == 0) { 710 ip6stat.ip6s_badscope++; 711 error = ENETUNREACH; /* XXX: better error? */ 712 /* XXX correct ifp? */ 713 in6_ifstat_inc(ifp, ifs6_out_discard); 714 goto bad; 715 } else { 716 ifp = &loif[0]; 717 } 718 } 719 720 if (opt && opt->ip6po_hlim != -1) 721 ip6->ip6_hlim = opt->ip6po_hlim & 0xff; 722 723 /* 724 * If caller did not provide an interface lookup a 725 * default in the routing table. This is either a 726 * default for the speicfied group (i.e. a host 727 * route), or a multicast default (a route for the 728 * ``net'' ff00::/8). 729 */ 730 if (ifp == NULL) { 731 if (ro->ro_rt == 0) 732 ro->ro_rt = rtalloc1((struct sockaddr *) 733 &ro->ro_dst, 0, 0UL); 734 else 735 RT_LOCK(ro->ro_rt); 736 if (ro->ro_rt == 0) { 737 ip6stat.ip6s_noroute++; 738 error = EHOSTUNREACH; 739 /* XXX in6_ifstat_inc(ifp, ifs6_out_discard) */ 740 goto bad; 741 } 742 ia = ifatoia6(ro->ro_rt->rt_ifa); 743 ifp = ro->ro_rt->rt_ifp; 744 ro->ro_rt->rt_rmx.rmx_pksent++; 745 RT_UNLOCK(ro->ro_rt); 746 } 747 748 if ((flags & IPV6_FORWARDING) == 0) 749 in6_ifstat_inc(ifp, ifs6_out_request); 750 in6_ifstat_inc(ifp, ifs6_out_mcast); 751 752 /* 753 * Confirm that the outgoing interface supports multicast. 754 */ 755 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 756 ip6stat.ip6s_noroute++; 757 in6_ifstat_inc(ifp, ifs6_out_discard); 758 error = ENETUNREACH; 759 goto bad; 760 } 761 IN6_LOOKUP_MULTI(ip6->ip6_dst, ifp, in6m); 762 if (in6m != NULL && 763 (im6o == NULL || im6o->im6o_multicast_loop)) { 764 /* 765 * If we belong to the destination multicast group 766 * on the outgoing interface, and the caller did not 767 * forbid loopback, loop back a copy. 768 */ 769 ip6_mloopback(ifp, m, dst); 770 } else { 771 /* 772 * If we are acting as a multicast router, perform 773 * multicast forwarding as if the packet had just 774 * arrived on the interface to which we are about 775 * to send. The multicast forwarding function 776 * recursively calls this function, using the 777 * IPV6_FORWARDING flag to prevent infinite recursion. 778 * 779 * Multicasts that are looped back by ip6_mloopback(), 780 * above, will be forwarded by the ip6_input() routine, 781 * if necessary. 782 */ 783 if (ip6_mrouter && (flags & IPV6_FORWARDING) == 0) { 784 if (ip6_mforward(ip6, ifp, m) != 0) { 785 m_freem(m); 786 goto done; 787 } 788 } 789 } 790 /* 791 * Multicasts with a hoplimit of zero may be looped back, 792 * above, but must not be transmitted on a network. 793 * Also, multicasts addressed to the loopback interface 794 * are not sent -- the above call to ip6_mloopback() will 795 * loop back a copy if this host actually belongs to the 796 * destination group on the loopback interface. 797 */ 798 if (ip6->ip6_hlim == 0 || (ifp->if_flags & IFF_LOOPBACK) || 799 IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst)) { 800 m_freem(m); 801 goto done; 802 } 803 } 804 805 /* 806 * Fill the outgoing inteface to tell the upper layer 807 * to increment per-interface statistics. 808 */ 809 if (ifpp) 810 *ifpp = ifp; 811 812 /* Determine path MTU. */ 813 if ((error = ip6_getpmtu(ro_pmtu, ro, ifp, &finaldst, &mtu, 814 &alwaysfrag)) != 0) 815 goto bad; 816 817 /* 818 * The caller of this function may specify to use the minimum MTU 819 * in some cases. 820 * An advanced API option (IPV6_USE_MIN_MTU) can also override MTU 821 * setting. The logic is a bit complicated; by default, unicast 822 * packets will follow path MTU while multicast packets will be sent at 823 * the minimum MTU. If IP6PO_MINMTU_ALL is specified, all packets 824 * including unicast ones will be sent at the minimum MTU. Multicast 825 * packets will always be sent at the minimum MTU unless 826 * IP6PO_MINMTU_DISABLE is explicitly specified. 827 * See RFC 3542 for more details. 828 */ 829 if (mtu > IPV6_MMTU) { 830 if ((flags & IPV6_MINMTU)) 831 mtu = IPV6_MMTU; 832 else if (opt && opt->ip6po_minmtu == IP6PO_MINMTU_ALL) 833 mtu = IPV6_MMTU; 834 else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) && 835 (opt == NULL || 836 opt->ip6po_minmtu != IP6PO_MINMTU_DISABLE)) { 837 mtu = IPV6_MMTU; 838 } 839 } 840 841 /* Fake scoped addresses */ 842 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 843 /* 844 * If source or destination address is a scoped address, and 845 * the packet is going to be sent to a loopback interface, 846 * we should keep the original interface. 847 */ 848 849 /* 850 * XXX: this is a very experimental and temporary solution. 851 * We eventually have sockaddr_in6 and use the sin6_scope_id 852 * field of the structure here. 853 * We rely on the consistency between two scope zone ids 854 * of source and destination, which should already be assured. 855 * Larger scopes than link will be supported in the future. 856 */ 857 origifp = NULL; 858 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) 859 origifp = ifnet_byindex(ntohs(ip6->ip6_src.s6_addr16[1])); 860 else if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) 861 origifp = ifnet_byindex(ntohs(ip6->ip6_dst.s6_addr16[1])); 862 /* 863 * XXX: origifp can be NULL even in those two cases above. 864 * For example, if we remove the (only) link-local address 865 * from the loopback interface, and try to send a link-local 866 * address without link-id information. Then the source 867 * address is ::1, and the destination address is the 868 * link-local address with its s6_addr16[1] being zero. 869 * What is worse, if the packet goes to the loopback interface 870 * by a default rejected route, the null pointer would be 871 * passed to looutput, and the kernel would hang. 872 * The following last resort would prevent such disaster. 873 */ 874 if (origifp == NULL) 875 origifp = ifp; 876 } 877 else 878 origifp = ifp; 879 /* 880 * clear embedded scope identifiers if necessary. 881 * in6_clearscope will touch the addresses only when necessary. 882 */ 883 in6_clearscope(&ip6->ip6_src); 884 in6_clearscope(&ip6->ip6_dst); 885 886 /* 887 * Check with the firewall... 888 */ 889 if (ip6_fw_enable && ip6_fw_chk_ptr) { 890 u_short port = 0; 891 m->m_pkthdr.rcvif = NULL; /* XXX */ 892 /* If ipfw says divert, we have to just drop packet */ 893 if ((*ip6_fw_chk_ptr)(&ip6, ifp, &port, &m)) { 894 m_freem(m); 895 goto done; 896 } 897 if (!m) { 898 error = EACCES; 899 goto done; 900 } 901 } 902 903 /* 904 * If the outgoing packet contains a hop-by-hop options header, 905 * it must be examined and processed even by the source node. 906 * (RFC 2460, section 4.) 907 */ 908 if (exthdrs.ip6e_hbh) { 909 struct ip6_hbh *hbh = mtod(exthdrs.ip6e_hbh, struct ip6_hbh *); 910 u_int32_t dummy; /* XXX unused */ 911 u_int32_t plen = 0; /* XXX: ip6_process will check the value */ 912 913 #ifdef DIAGNOSTIC 914 if ((hbh->ip6h_len + 1) << 3 > exthdrs.ip6e_hbh->m_len) 915 panic("ip6e_hbh is not continuous"); 916 #endif 917 /* 918 * XXX: if we have to send an ICMPv6 error to the sender, 919 * we need the M_LOOP flag since icmp6_error() expects 920 * the IPv6 and the hop-by-hop options header are 921 * continuous unless the flag is set. 922 */ 923 m->m_flags |= M_LOOP; 924 m->m_pkthdr.rcvif = ifp; 925 if (ip6_process_hopopts(m, (u_int8_t *)(hbh + 1), 926 ((hbh->ip6h_len + 1) << 3) - sizeof(struct ip6_hbh), 927 &dummy, &plen) < 0) { 928 /* m was already freed at this point */ 929 error = EINVAL;/* better error? */ 930 goto done; 931 } 932 m->m_flags &= ~M_LOOP; /* XXX */ 933 m->m_pkthdr.rcvif = NULL; 934 } 935 936 /* Jump over all PFIL processing if hooks are not active. */ 937 if (inet6_pfil_hook.ph_busy_count == -1) 938 goto passout; 939 940 /* Run through list of hooks for output packets. */ 941 error = pfil_run_hooks(&inet6_pfil_hook, &m, ifp, PFIL_OUT, inp); 942 if (error != 0 || m == NULL) 943 goto done; 944 ip6 = mtod(m, struct ip6_hdr *); 945 946 passout: 947 /* 948 * Send the packet to the outgoing interface. 949 * If necessary, do IPv6 fragmentation before sending. 950 * 951 * the logic here is rather complex: 952 * 1: normal case (dontfrag == 0, alwaysfrag == 0) 953 * 1-a: send as is if tlen <= path mtu 954 * 1-b: fragment if tlen > path mtu 955 * 956 * 2: if user asks us not to fragment (dontfrag == 1) 957 * 2-a: send as is if tlen <= interface mtu 958 * 2-b: error if tlen > interface mtu 959 * 960 * 3: if we always need to attach fragment header (alwaysfrag == 1) 961 * always fragment 962 * 963 * 4: if dontfrag == 1 && alwaysfrag == 1 964 * error, as we cannot handle this conflicting request 965 */ 966 tlen = m->m_pkthdr.len; 967 968 if (opt && (opt->ip6po_flags & IP6PO_DONTFRAG)) 969 dontfrag = 1; 970 else 971 dontfrag = 0; 972 if (dontfrag && alwaysfrag) { /* case 4 */ 973 /* conflicting request - can't transmit */ 974 error = EMSGSIZE; 975 goto bad; 976 } 977 if (dontfrag && tlen > IN6_LINKMTU(ifp)) { /* case 2-b */ 978 /* 979 * Even if the DONTFRAG option is specified, we cannot send the 980 * packet when the data length is larger than the MTU of the 981 * outgoing interface. 982 * Notify the error by sending IPV6_PATHMTU ancillary data as 983 * well as returning an error code (the latter is not described 984 * in the API spec.) 985 */ 986 u_int32_t mtu32; 987 struct ip6ctlparam ip6cp; 988 989 mtu32 = (u_int32_t)mtu; 990 bzero(&ip6cp, sizeof(ip6cp)); 991 ip6cp.ip6c_cmdarg = (void *)&mtu32; 992 pfctlinput2(PRC_MSGSIZE, (struct sockaddr *)&ro_pmtu->ro_dst, 993 (void *)&ip6cp); 994 995 error = EMSGSIZE; 996 goto bad; 997 } 998 999 /* 1000 * transmit packet without fragmentation 1001 */ 1002 if (dontfrag || (!alwaysfrag && tlen <= mtu)) { /* case 1-a and 2-a */ 1003 struct in6_ifaddr *ia6; 1004 1005 ip6 = mtod(m, struct ip6_hdr *); 1006 ia6 = in6_ifawithifp(ifp, &ip6->ip6_src); 1007 if (ia6) { 1008 /* Record statistics for this interface address. */ 1009 ia6->ia_ifa.if_opackets++; 1010 ia6->ia_ifa.if_obytes += m->m_pkthdr.len; 1011 } 1012 #ifdef IPSEC 1013 /* clean ipsec history once it goes out of the node */ 1014 ipsec_delaux(m); 1015 #endif 1016 error = nd6_output(ifp, origifp, m, dst, ro->ro_rt); 1017 goto done; 1018 } 1019 1020 /* 1021 * try to fragment the packet. case 1-b and 3 1022 */ 1023 if (mtu < IPV6_MMTU) { 1024 /* path MTU cannot be less than IPV6_MMTU */ 1025 error = EMSGSIZE; 1026 in6_ifstat_inc(ifp, ifs6_out_fragfail); 1027 goto bad; 1028 } else if (ip6->ip6_plen == 0) { 1029 /* jumbo payload cannot be fragmented */ 1030 error = EMSGSIZE; 1031 in6_ifstat_inc(ifp, ifs6_out_fragfail); 1032 goto bad; 1033 } else { 1034 struct mbuf **mnext, *m_frgpart; 1035 struct ip6_frag *ip6f; 1036 u_int32_t id = htonl(ip6_randomid()); 1037 u_char nextproto; 1038 #if 0 1039 struct ip6ctlparam ip6cp; 1040 u_int32_t mtu32; 1041 #endif 1042 int qslots = ifp->if_snd.ifq_maxlen - ifp->if_snd.ifq_len; 1043 1044 /* 1045 * Too large for the destination or interface; 1046 * fragment if possible. 1047 * Must be able to put at least 8 bytes per fragment. 1048 */ 1049 hlen = unfragpartlen; 1050 if (mtu > IPV6_MAXPACKET) 1051 mtu = IPV6_MAXPACKET; 1052 1053 #if 0 1054 /* 1055 * It is believed this code is a leftover from the 1056 * development of the IPV6_RECVPATHMTU sockopt and 1057 * associated work to implement RFC3542. 1058 * It's not entirely clear what the intent of the API 1059 * is at this point, so disable this code for now. 1060 * The IPV6_RECVPATHMTU sockopt and/or IPV6_DONTFRAG 1061 * will send notifications if the application requests. 1062 */ 1063 1064 /* Notify a proper path MTU to applications. */ 1065 mtu32 = (u_int32_t)mtu; 1066 bzero(&ip6cp, sizeof(ip6cp)); 1067 ip6cp.ip6c_cmdarg = (void *)&mtu32; 1068 pfctlinput2(PRC_MSGSIZE, (struct sockaddr *)&ro_pmtu->ro_dst, 1069 (void *)&ip6cp); 1070 #endif 1071 1072 len = (mtu - hlen - sizeof(struct ip6_frag)) & ~7; 1073 if (len < 8) { 1074 error = EMSGSIZE; 1075 in6_ifstat_inc(ifp, ifs6_out_fragfail); 1076 goto bad; 1077 } 1078 1079 /* 1080 * Verify that we have any chance at all of being able to queue 1081 * the packet or packet fragments 1082 */ 1083 if (qslots <= 0 || ((u_int)qslots * (mtu - hlen) 1084 < tlen /* - hlen */)) { 1085 error = ENOBUFS; 1086 ip6stat.ip6s_odropped++; 1087 goto bad; 1088 } 1089 1090 mnext = &m->m_nextpkt; 1091 1092 /* 1093 * Change the next header field of the last header in the 1094 * unfragmentable part. 1095 */ 1096 if (exthdrs.ip6e_rthdr) { 1097 nextproto = *mtod(exthdrs.ip6e_rthdr, u_char *); 1098 *mtod(exthdrs.ip6e_rthdr, u_char *) = IPPROTO_FRAGMENT; 1099 } else if (exthdrs.ip6e_dest1) { 1100 nextproto = *mtod(exthdrs.ip6e_dest1, u_char *); 1101 *mtod(exthdrs.ip6e_dest1, u_char *) = IPPROTO_FRAGMENT; 1102 } else if (exthdrs.ip6e_hbh) { 1103 nextproto = *mtod(exthdrs.ip6e_hbh, u_char *); 1104 *mtod(exthdrs.ip6e_hbh, u_char *) = IPPROTO_FRAGMENT; 1105 } else { 1106 nextproto = ip6->ip6_nxt; 1107 ip6->ip6_nxt = IPPROTO_FRAGMENT; 1108 } 1109 1110 /* 1111 * Loop through length of segment after first fragment, 1112 * make new header and copy data of each part and link onto 1113 * chain. 1114 */ 1115 m0 = m; 1116 for (off = hlen; off < tlen; off += len) { 1117 MGETHDR(m, M_DONTWAIT, MT_HEADER); 1118 if (!m) { 1119 error = ENOBUFS; 1120 ip6stat.ip6s_odropped++; 1121 goto sendorfree; 1122 } 1123 m->m_pkthdr.rcvif = NULL; 1124 m->m_flags = m0->m_flags & M_COPYFLAGS; 1125 *mnext = m; 1126 mnext = &m->m_nextpkt; 1127 m->m_data += max_linkhdr; 1128 mhip6 = mtod(m, struct ip6_hdr *); 1129 *mhip6 = *ip6; 1130 m->m_len = sizeof(*mhip6); 1131 error = ip6_insertfraghdr(m0, m, hlen, &ip6f); 1132 if (error) { 1133 ip6stat.ip6s_odropped++; 1134 goto sendorfree; 1135 } 1136 ip6f->ip6f_offlg = htons((u_short)((off - hlen) & ~7)); 1137 if (off + len >= tlen) 1138 len = tlen - off; 1139 else 1140 ip6f->ip6f_offlg |= IP6F_MORE_FRAG; 1141 mhip6->ip6_plen = htons((u_short)(len + hlen + 1142 sizeof(*ip6f) - sizeof(struct ip6_hdr))); 1143 if ((m_frgpart = m_copy(m0, off, len)) == 0) { 1144 error = ENOBUFS; 1145 ip6stat.ip6s_odropped++; 1146 goto sendorfree; 1147 } 1148 m_cat(m, m_frgpart); 1149 m->m_pkthdr.len = len + hlen + sizeof(*ip6f); 1150 m->m_pkthdr.rcvif = (struct ifnet *)0; 1151 ip6f->ip6f_reserved = 0; 1152 ip6f->ip6f_ident = id; 1153 ip6f->ip6f_nxt = nextproto; 1154 ip6stat.ip6s_ofragments++; 1155 in6_ifstat_inc(ifp, ifs6_out_fragcreat); 1156 } 1157 1158 in6_ifstat_inc(ifp, ifs6_out_fragok); 1159 } 1160 1161 /* 1162 * Remove leading garbages. 1163 */ 1164 sendorfree: 1165 m = m0->m_nextpkt; 1166 m0->m_nextpkt = 0; 1167 m_freem(m0); 1168 for (m0 = m; m; m = m0) { 1169 m0 = m->m_nextpkt; 1170 m->m_nextpkt = 0; 1171 if (error == 0) { 1172 /* Record statistics for this interface address. */ 1173 if (ia) { 1174 ia->ia_ifa.if_opackets++; 1175 ia->ia_ifa.if_obytes += m->m_pkthdr.len; 1176 } 1177 #ifdef IPSEC 1178 /* clean ipsec history once it goes out of the node */ 1179 ipsec_delaux(m); 1180 #endif 1181 error = nd6_output(ifp, origifp, m, dst, ro->ro_rt); 1182 } else 1183 m_freem(m); 1184 } 1185 1186 if (error == 0) 1187 ip6stat.ip6s_fragmented++; 1188 1189 done: 1190 if (ro == &ip6route && ro->ro_rt) { /* brace necessary for RTFREE */ 1191 RTFREE(ro->ro_rt); 1192 } else if (ro_pmtu == &ip6route && ro_pmtu->ro_rt) { 1193 RTFREE(ro_pmtu->ro_rt); 1194 } 1195 1196 #ifdef IPSEC 1197 if (sp != NULL) 1198 key_freesp(sp); 1199 #endif /* IPSEC */ 1200 #ifdef FAST_IPSEC 1201 if (sp != NULL) 1202 KEY_FREESP(&sp); 1203 #endif /* FAST_IPSEC */ 1204 1205 return (error); 1206 1207 freehdrs: 1208 m_freem(exthdrs.ip6e_hbh); /* m_freem will check if mbuf is 0 */ 1209 m_freem(exthdrs.ip6e_dest1); 1210 m_freem(exthdrs.ip6e_rthdr); 1211 m_freem(exthdrs.ip6e_dest2); 1212 /* FALLTHROUGH */ 1213 bad: 1214 m_freem(m); 1215 goto done; 1216 } 1217 1218 static int 1219 ip6_copyexthdr(mp, hdr, hlen) 1220 struct mbuf **mp; 1221 caddr_t hdr; 1222 int hlen; 1223 { 1224 struct mbuf *m; 1225 1226 if (hlen > MCLBYTES) 1227 return (ENOBUFS); /* XXX */ 1228 1229 MGET(m, M_DONTWAIT, MT_DATA); 1230 if (!m) 1231 return (ENOBUFS); 1232 1233 if (hlen > MLEN) { 1234 MCLGET(m, M_DONTWAIT); 1235 if ((m->m_flags & M_EXT) == 0) { 1236 m_free(m); 1237 return (ENOBUFS); 1238 } 1239 } 1240 m->m_len = hlen; 1241 if (hdr) 1242 bcopy(hdr, mtod(m, caddr_t), hlen); 1243 1244 *mp = m; 1245 return (0); 1246 } 1247 1248 /* 1249 * Insert jumbo payload option. 1250 */ 1251 static int 1252 ip6_insert_jumboopt(exthdrs, plen) 1253 struct ip6_exthdrs *exthdrs; 1254 u_int32_t plen; 1255 { 1256 struct mbuf *mopt; 1257 u_char *optbuf; 1258 u_int32_t v; 1259 1260 #define JUMBOOPTLEN 8 /* length of jumbo payload option and padding */ 1261 1262 /* 1263 * If there is no hop-by-hop options header, allocate new one. 1264 * If there is one but it doesn't have enough space to store the 1265 * jumbo payload option, allocate a cluster to store the whole options. 1266 * Otherwise, use it to store the options. 1267 */ 1268 if (exthdrs->ip6e_hbh == 0) { 1269 MGET(mopt, M_DONTWAIT, MT_DATA); 1270 if (mopt == 0) 1271 return (ENOBUFS); 1272 mopt->m_len = JUMBOOPTLEN; 1273 optbuf = mtod(mopt, u_char *); 1274 optbuf[1] = 0; /* = ((JUMBOOPTLEN) >> 3) - 1 */ 1275 exthdrs->ip6e_hbh = mopt; 1276 } else { 1277 struct ip6_hbh *hbh; 1278 1279 mopt = exthdrs->ip6e_hbh; 1280 if (M_TRAILINGSPACE(mopt) < JUMBOOPTLEN) { 1281 /* 1282 * XXX assumption: 1283 * - exthdrs->ip6e_hbh is not referenced from places 1284 * other than exthdrs. 1285 * - exthdrs->ip6e_hbh is not an mbuf chain. 1286 */ 1287 int oldoptlen = mopt->m_len; 1288 struct mbuf *n; 1289 1290 /* 1291 * XXX: give up if the whole (new) hbh header does 1292 * not fit even in an mbuf cluster. 1293 */ 1294 if (oldoptlen + JUMBOOPTLEN > MCLBYTES) 1295 return (ENOBUFS); 1296 1297 /* 1298 * As a consequence, we must always prepare a cluster 1299 * at this point. 1300 */ 1301 MGET(n, M_DONTWAIT, MT_DATA); 1302 if (n) { 1303 MCLGET(n, M_DONTWAIT); 1304 if ((n->m_flags & M_EXT) == 0) { 1305 m_freem(n); 1306 n = NULL; 1307 } 1308 } 1309 if (!n) 1310 return (ENOBUFS); 1311 n->m_len = oldoptlen + JUMBOOPTLEN; 1312 bcopy(mtod(mopt, caddr_t), mtod(n, caddr_t), 1313 oldoptlen); 1314 optbuf = mtod(n, caddr_t) + oldoptlen; 1315 m_freem(mopt); 1316 mopt = exthdrs->ip6e_hbh = n; 1317 } else { 1318 optbuf = mtod(mopt, u_char *) + mopt->m_len; 1319 mopt->m_len += JUMBOOPTLEN; 1320 } 1321 optbuf[0] = IP6OPT_PADN; 1322 optbuf[1] = 1; 1323 1324 /* 1325 * Adjust the header length according to the pad and 1326 * the jumbo payload option. 1327 */ 1328 hbh = mtod(mopt, struct ip6_hbh *); 1329 hbh->ip6h_len += (JUMBOOPTLEN >> 3); 1330 } 1331 1332 /* fill in the option. */ 1333 optbuf[2] = IP6OPT_JUMBO; 1334 optbuf[3] = 4; 1335 v = (u_int32_t)htonl(plen + JUMBOOPTLEN); 1336 bcopy(&v, &optbuf[4], sizeof(u_int32_t)); 1337 1338 /* finally, adjust the packet header length */ 1339 exthdrs->ip6e_ip6->m_pkthdr.len += JUMBOOPTLEN; 1340 1341 return (0); 1342 #undef JUMBOOPTLEN 1343 } 1344 1345 /* 1346 * Insert fragment header and copy unfragmentable header portions. 1347 */ 1348 static int 1349 ip6_insertfraghdr(m0, m, hlen, frghdrp) 1350 struct mbuf *m0, *m; 1351 int hlen; 1352 struct ip6_frag **frghdrp; 1353 { 1354 struct mbuf *n, *mlast; 1355 1356 if (hlen > sizeof(struct ip6_hdr)) { 1357 n = m_copym(m0, sizeof(struct ip6_hdr), 1358 hlen - sizeof(struct ip6_hdr), M_DONTWAIT); 1359 if (n == 0) 1360 return (ENOBUFS); 1361 m->m_next = n; 1362 } else 1363 n = m; 1364 1365 /* Search for the last mbuf of unfragmentable part. */ 1366 for (mlast = n; mlast->m_next; mlast = mlast->m_next) 1367 ; 1368 1369 if ((mlast->m_flags & M_EXT) == 0 && 1370 M_TRAILINGSPACE(mlast) >= sizeof(struct ip6_frag)) { 1371 /* use the trailing space of the last mbuf for the fragment hdr */ 1372 *frghdrp = (struct ip6_frag *)(mtod(mlast, caddr_t) + 1373 mlast->m_len); 1374 mlast->m_len += sizeof(struct ip6_frag); 1375 m->m_pkthdr.len += sizeof(struct ip6_frag); 1376 } else { 1377 /* allocate a new mbuf for the fragment header */ 1378 struct mbuf *mfrg; 1379 1380 MGET(mfrg, M_DONTWAIT, MT_DATA); 1381 if (mfrg == 0) 1382 return (ENOBUFS); 1383 mfrg->m_len = sizeof(struct ip6_frag); 1384 *frghdrp = mtod(mfrg, struct ip6_frag *); 1385 mlast->m_next = mfrg; 1386 } 1387 1388 return (0); 1389 } 1390 1391 static int 1392 ip6_getpmtu(ro_pmtu, ro, ifp, dst, mtup, alwaysfragp) 1393 struct route_in6 *ro_pmtu, *ro; 1394 struct ifnet *ifp; 1395 struct in6_addr *dst; 1396 u_long *mtup; 1397 int *alwaysfragp; 1398 { 1399 u_int32_t mtu = 0; 1400 int alwaysfrag = 0; 1401 int error = 0; 1402 1403 if (ro_pmtu != ro) { 1404 /* The first hop and the final destination may differ. */ 1405 struct sockaddr_in6 *sa6_dst = 1406 (struct sockaddr_in6 *)&ro_pmtu->ro_dst; 1407 if (ro_pmtu->ro_rt && 1408 ((ro_pmtu->ro_rt->rt_flags & RTF_UP) == 0 || 1409 !IN6_ARE_ADDR_EQUAL(&sa6_dst->sin6_addr, dst))) { 1410 RTFREE(ro_pmtu->ro_rt); 1411 ro_pmtu->ro_rt = (struct rtentry *)NULL; 1412 } 1413 if (ro_pmtu->ro_rt == NULL) { 1414 bzero(sa6_dst, sizeof(*sa6_dst)); 1415 sa6_dst->sin6_family = AF_INET6; 1416 sa6_dst->sin6_len = sizeof(struct sockaddr_in6); 1417 sa6_dst->sin6_addr = *dst; 1418 1419 rtalloc((struct route *)ro_pmtu); 1420 } 1421 } 1422 if (ro_pmtu->ro_rt) { 1423 u_int32_t ifmtu; 1424 struct in_conninfo inc; 1425 1426 bzero(&inc, sizeof(inc)); 1427 inc.inc_flags = 1; /* IPv6 */ 1428 inc.inc6_faddr = *dst; 1429 1430 if (ifp == NULL) 1431 ifp = ro_pmtu->ro_rt->rt_ifp; 1432 ifmtu = IN6_LINKMTU(ifp); 1433 mtu = tcp_hc_getmtu(&inc); 1434 if (mtu) 1435 mtu = min(mtu, ro_pmtu->ro_rt->rt_rmx.rmx_mtu); 1436 else 1437 mtu = ro_pmtu->ro_rt->rt_rmx.rmx_mtu; 1438 if (mtu == 0) 1439 mtu = ifmtu; 1440 else if (mtu < IPV6_MMTU) { 1441 /* 1442 * RFC2460 section 5, last paragraph: 1443 * if we record ICMPv6 too big message with 1444 * mtu < IPV6_MMTU, transmit packets sized IPV6_MMTU 1445 * or smaller, with framgent header attached. 1446 * (fragment header is needed regardless from the 1447 * packet size, for translators to identify packets) 1448 */ 1449 alwaysfrag = 1; 1450 mtu = IPV6_MMTU; 1451 } else if (mtu > ifmtu) { 1452 /* 1453 * The MTU on the route is larger than the MTU on 1454 * the interface! This shouldn't happen, unless the 1455 * MTU of the interface has been changed after the 1456 * interface was brought up. Change the MTU in the 1457 * route to match the interface MTU (as long as the 1458 * field isn't locked). 1459 */ 1460 mtu = ifmtu; 1461 ro_pmtu->ro_rt->rt_rmx.rmx_mtu = mtu; 1462 } 1463 } else if (ifp) { 1464 mtu = IN6_LINKMTU(ifp); 1465 } else 1466 error = EHOSTUNREACH; /* XXX */ 1467 1468 *mtup = mtu; 1469 if (alwaysfragp) 1470 *alwaysfragp = alwaysfrag; 1471 return (error); 1472 } 1473 1474 /* 1475 * IP6 socket option processing. 1476 */ 1477 int 1478 ip6_ctloutput(so, sopt) 1479 struct socket *so; 1480 struct sockopt *sopt; 1481 { 1482 int privileged, optdatalen, uproto; 1483 void *optdata; 1484 struct inpcb *in6p = sotoinpcb(so); 1485 int error, optval; 1486 int level, op, optname; 1487 int optlen; 1488 struct thread *td; 1489 1490 if (sopt) { 1491 level = sopt->sopt_level; 1492 op = sopt->sopt_dir; 1493 optname = sopt->sopt_name; 1494 optlen = sopt->sopt_valsize; 1495 td = sopt->sopt_td; 1496 } else { 1497 panic("ip6_ctloutput: arg soopt is NULL"); 1498 } 1499 error = optval = 0; 1500 1501 privileged = (td == 0 || suser(td)) ? 0 : 1; 1502 uproto = (int)so->so_proto->pr_protocol; 1503 1504 if (level == IPPROTO_IPV6) { 1505 switch (op) { 1506 1507 case SOPT_SET: 1508 switch (optname) { 1509 case IPV6_2292PKTOPTIONS: 1510 #ifdef IPV6_PKTOPTIONS 1511 case IPV6_PKTOPTIONS: 1512 #endif 1513 { 1514 struct mbuf *m; 1515 1516 error = soopt_getm(sopt, &m); /* XXX */ 1517 if (error != 0) 1518 break; 1519 error = soopt_mcopyin(sopt, m); /* XXX */ 1520 if (error != 0) 1521 break; 1522 error = ip6_pcbopts(&in6p->in6p_outputopts, 1523 m, so, sopt); 1524 m_freem(m); /* XXX */ 1525 break; 1526 } 1527 1528 /* 1529 * Use of some Hop-by-Hop options or some 1530 * Destination options, might require special 1531 * privilege. That is, normal applications 1532 * (without special privilege) might be forbidden 1533 * from setting certain options in outgoing packets, 1534 * and might never see certain options in received 1535 * packets. [RFC 2292 Section 6] 1536 * KAME specific note: 1537 * KAME prevents non-privileged users from sending or 1538 * receiving ANY hbh/dst options in order to avoid 1539 * overhead of parsing options in the kernel. 1540 */ 1541 case IPV6_RECVHOPOPTS: 1542 case IPV6_RECVDSTOPTS: 1543 case IPV6_RECVRTHDRDSTOPTS: 1544 if (!privileged) { 1545 error = EPERM; 1546 break; 1547 } 1548 /* FALLTHROUGH */ 1549 case IPV6_UNICAST_HOPS: 1550 case IPV6_HOPLIMIT: 1551 case IPV6_FAITH: 1552 1553 case IPV6_RECVPKTINFO: 1554 case IPV6_RECVHOPLIMIT: 1555 case IPV6_RECVRTHDR: 1556 case IPV6_RECVPATHMTU: 1557 case IPV6_RECVTCLASS: 1558 case IPV6_V6ONLY: 1559 case IPV6_AUTOFLOWLABEL: 1560 if (optlen != sizeof(int)) { 1561 error = EINVAL; 1562 break; 1563 } 1564 error = sooptcopyin(sopt, &optval, 1565 sizeof optval, sizeof optval); 1566 if (error) 1567 break; 1568 switch (optname) { 1569 1570 case IPV6_UNICAST_HOPS: 1571 if (optval < -1 || optval >= 256) 1572 error = EINVAL; 1573 else { 1574 /* -1 = kernel default */ 1575 in6p->in6p_hops = optval; 1576 if ((in6p->in6p_vflag & 1577 INP_IPV4) != 0) 1578 in6p->inp_ip_ttl = optval; 1579 } 1580 break; 1581 #define OPTSET(bit) \ 1582 do { \ 1583 if (optval) \ 1584 in6p->in6p_flags |= (bit); \ 1585 else \ 1586 in6p->in6p_flags &= ~(bit); \ 1587 } while (/*CONSTCOND*/ 0) 1588 #define OPTSET2292(bit) \ 1589 do { \ 1590 in6p->in6p_flags |= IN6P_RFC2292; \ 1591 if (optval) \ 1592 in6p->in6p_flags |= (bit); \ 1593 else \ 1594 in6p->in6p_flags &= ~(bit); \ 1595 } while (/*CONSTCOND*/ 0) 1596 #define OPTBIT(bit) (in6p->in6p_flags & (bit) ? 1 : 0) 1597 1598 case IPV6_RECVPKTINFO: 1599 /* cannot mix with RFC2292 */ 1600 if (OPTBIT(IN6P_RFC2292)) { 1601 error = EINVAL; 1602 break; 1603 } 1604 OPTSET(IN6P_PKTINFO); 1605 break; 1606 1607 case IPV6_HOPLIMIT: 1608 { 1609 struct ip6_pktopts **optp; 1610 1611 /* cannot mix with RFC2292 */ 1612 if (OPTBIT(IN6P_RFC2292)) { 1613 error = EINVAL; 1614 break; 1615 } 1616 optp = &in6p->in6p_outputopts; 1617 error = ip6_pcbopt(IPV6_HOPLIMIT, 1618 (u_char *)&optval, 1619 sizeof(optval), 1620 optp, 1621 privileged, uproto); 1622 break; 1623 } 1624 1625 case IPV6_RECVHOPLIMIT: 1626 /* cannot mix with RFC2292 */ 1627 if (OPTBIT(IN6P_RFC2292)) { 1628 error = EINVAL; 1629 break; 1630 } 1631 OPTSET(IN6P_HOPLIMIT); 1632 break; 1633 1634 case IPV6_RECVHOPOPTS: 1635 /* cannot mix with RFC2292 */ 1636 if (OPTBIT(IN6P_RFC2292)) { 1637 error = EINVAL; 1638 break; 1639 } 1640 OPTSET(IN6P_HOPOPTS); 1641 break; 1642 1643 case IPV6_RECVDSTOPTS: 1644 /* cannot mix with RFC2292 */ 1645 if (OPTBIT(IN6P_RFC2292)) { 1646 error = EINVAL; 1647 break; 1648 } 1649 OPTSET(IN6P_DSTOPTS); 1650 break; 1651 1652 case IPV6_RECVRTHDRDSTOPTS: 1653 /* cannot mix with RFC2292 */ 1654 if (OPTBIT(IN6P_RFC2292)) { 1655 error = EINVAL; 1656 break; 1657 } 1658 OPTSET(IN6P_RTHDRDSTOPTS); 1659 break; 1660 1661 case IPV6_RECVRTHDR: 1662 /* cannot mix with RFC2292 */ 1663 if (OPTBIT(IN6P_RFC2292)) { 1664 error = EINVAL; 1665 break; 1666 } 1667 OPTSET(IN6P_RTHDR); 1668 break; 1669 1670 case IPV6_FAITH: 1671 OPTSET(IN6P_FAITH); 1672 break; 1673 1674 case IPV6_RECVPATHMTU: 1675 /* 1676 * We ignore this option for TCP 1677 * sockets. 1678 * (RFC3542 leaves this case 1679 * unspecified.) 1680 */ 1681 if (uproto != IPPROTO_TCP) 1682 OPTSET(IN6P_MTU); 1683 break; 1684 1685 case IPV6_V6ONLY: 1686 /* 1687 * make setsockopt(IPV6_V6ONLY) 1688 * available only prior to bind(2). 1689 * see ipng mailing list, Jun 22 2001. 1690 */ 1691 if (in6p->in6p_lport || 1692 !IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) { 1693 error = EINVAL; 1694 break; 1695 } 1696 OPTSET(IN6P_IPV6_V6ONLY); 1697 if (optval) 1698 in6p->in6p_vflag &= ~INP_IPV4; 1699 else 1700 in6p->in6p_vflag |= INP_IPV4; 1701 break; 1702 case IPV6_RECVTCLASS: 1703 /* cannot mix with RFC2292 XXX */ 1704 if (OPTBIT(IN6P_RFC2292)) { 1705 error = EINVAL; 1706 break; 1707 } 1708 OPTSET(IN6P_TCLASS); 1709 break; 1710 case IPV6_AUTOFLOWLABEL: 1711 OPTSET(IN6P_AUTOFLOWLABEL); 1712 break; 1713 1714 } 1715 break; 1716 1717 case IPV6_TCLASS: 1718 case IPV6_DONTFRAG: 1719 case IPV6_USE_MIN_MTU: 1720 case IPV6_PREFER_TEMPADDR: 1721 if (optlen != sizeof(optval)) { 1722 error = EINVAL; 1723 break; 1724 } 1725 error = sooptcopyin(sopt, &optval, 1726 sizeof optval, sizeof optval); 1727 if (error) 1728 break; 1729 { 1730 struct ip6_pktopts **optp; 1731 optp = &in6p->in6p_outputopts; 1732 error = ip6_pcbopt(optname, 1733 (u_char *)&optval, 1734 sizeof(optval), 1735 optp, 1736 privileged, uproto); 1737 break; 1738 } 1739 1740 case IPV6_2292PKTINFO: 1741 case IPV6_2292HOPLIMIT: 1742 case IPV6_2292HOPOPTS: 1743 case IPV6_2292DSTOPTS: 1744 case IPV6_2292RTHDR: 1745 /* RFC 2292 */ 1746 if (optlen != sizeof(int)) { 1747 error = EINVAL; 1748 break; 1749 } 1750 error = sooptcopyin(sopt, &optval, 1751 sizeof optval, sizeof optval); 1752 if (error) 1753 break; 1754 switch (optname) { 1755 case IPV6_2292PKTINFO: 1756 OPTSET2292(IN6P_PKTINFO); 1757 break; 1758 case IPV6_2292HOPLIMIT: 1759 OPTSET2292(IN6P_HOPLIMIT); 1760 break; 1761 case IPV6_2292HOPOPTS: 1762 /* 1763 * Check super-user privilege. 1764 * See comments for IPV6_RECVHOPOPTS. 1765 */ 1766 if (!privileged) 1767 return (EPERM); 1768 OPTSET2292(IN6P_HOPOPTS); 1769 break; 1770 case IPV6_2292DSTOPTS: 1771 if (!privileged) 1772 return (EPERM); 1773 OPTSET2292(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); /* XXX */ 1774 break; 1775 case IPV6_2292RTHDR: 1776 OPTSET2292(IN6P_RTHDR); 1777 break; 1778 } 1779 break; 1780 case IPV6_PKTINFO: 1781 case IPV6_HOPOPTS: 1782 case IPV6_RTHDR: 1783 case IPV6_DSTOPTS: 1784 case IPV6_RTHDRDSTOPTS: 1785 case IPV6_NEXTHOP: 1786 { 1787 /* new advanced API (RFC3542) */ 1788 u_char *optbuf; 1789 int optlen; 1790 struct ip6_pktopts **optp; 1791 1792 /* cannot mix with RFC2292 */ 1793 if (OPTBIT(IN6P_RFC2292)) { 1794 error = EINVAL; 1795 break; 1796 } 1797 1798 switch (optname) { 1799 case IPV6_HOPOPTS: 1800 case IPV6_DSTOPTS: 1801 case IPV6_RTHDRDSTOPTS: 1802 case IPV6_NEXTHOP: 1803 if (!privileged) 1804 error = EPERM; 1805 break; 1806 } 1807 if (error) 1808 break; 1809 1810 switch (optname) { 1811 case IPV6_PKTINFO: 1812 optlen = sizeof(struct in6_pktinfo); 1813 break; 1814 case IPV6_NEXTHOP: 1815 optlen = SOCK_MAXADDRLEN; 1816 break; 1817 default: 1818 optlen = IPV6_MAXOPTHDR; 1819 break; 1820 } 1821 if (sopt->sopt_valsize > optlen) { 1822 error = EINVAL; 1823 break; 1824 } 1825 1826 optlen = sopt->sopt_valsize; 1827 optbuf = malloc(optlen, M_TEMP, M_WAITOK); 1828 error = sooptcopyin(sopt, optbuf, optlen, 1829 optlen); 1830 if (error) { 1831 free(optbuf, M_TEMP); 1832 break; 1833 } 1834 1835 optp = &in6p->in6p_outputopts; 1836 error = ip6_pcbopt(optname, 1837 optbuf, optlen, 1838 optp, privileged, uproto); 1839 free(optbuf, M_TEMP); 1840 break; 1841 } 1842 #undef OPTSET 1843 1844 case IPV6_MULTICAST_IF: 1845 case IPV6_MULTICAST_HOPS: 1846 case IPV6_MULTICAST_LOOP: 1847 case IPV6_JOIN_GROUP: 1848 case IPV6_LEAVE_GROUP: 1849 { 1850 if (sopt->sopt_valsize > MLEN) { 1851 error = EMSGSIZE; 1852 break; 1853 } 1854 /* XXX */ 1855 } 1856 /* FALLTHROUGH */ 1857 { 1858 struct mbuf *m; 1859 1860 if (sopt->sopt_valsize > MCLBYTES) { 1861 error = EMSGSIZE; 1862 break; 1863 } 1864 /* XXX */ 1865 MGET(m, sopt->sopt_td ? M_WAIT : M_DONTWAIT, MT_HEADER); 1866 if (m == 0) { 1867 error = ENOBUFS; 1868 break; 1869 } 1870 if (sopt->sopt_valsize > MLEN) { 1871 MCLGET(m, sopt->sopt_td ? M_WAIT : M_DONTWAIT); 1872 if ((m->m_flags & M_EXT) == 0) { 1873 m_free(m); 1874 error = ENOBUFS; 1875 break; 1876 } 1877 } 1878 m->m_len = sopt->sopt_valsize; 1879 error = sooptcopyin(sopt, mtod(m, char *), 1880 m->m_len, m->m_len); 1881 if (error) { 1882 (void)m_free(m); 1883 break; 1884 } 1885 error = ip6_setmoptions(sopt->sopt_name, 1886 &in6p->in6p_moptions, 1887 m); 1888 (void)m_free(m); 1889 } 1890 break; 1891 1892 case IPV6_PORTRANGE: 1893 error = sooptcopyin(sopt, &optval, 1894 sizeof optval, sizeof optval); 1895 if (error) 1896 break; 1897 1898 switch (optval) { 1899 case IPV6_PORTRANGE_DEFAULT: 1900 in6p->in6p_flags &= ~(IN6P_LOWPORT); 1901 in6p->in6p_flags &= ~(IN6P_HIGHPORT); 1902 break; 1903 1904 case IPV6_PORTRANGE_HIGH: 1905 in6p->in6p_flags &= ~(IN6P_LOWPORT); 1906 in6p->in6p_flags |= IN6P_HIGHPORT; 1907 break; 1908 1909 case IPV6_PORTRANGE_LOW: 1910 in6p->in6p_flags &= ~(IN6P_HIGHPORT); 1911 in6p->in6p_flags |= IN6P_LOWPORT; 1912 break; 1913 1914 default: 1915 error = EINVAL; 1916 break; 1917 } 1918 break; 1919 1920 #if defined(IPSEC) || defined(FAST_IPSEC) 1921 case IPV6_IPSEC_POLICY: 1922 { 1923 caddr_t req = NULL; 1924 size_t len = 0; 1925 struct mbuf *m; 1926 1927 if ((error = soopt_getm(sopt, &m)) != 0) /* XXX */ 1928 break; 1929 if ((error = soopt_mcopyin(sopt, m)) != 0) /* XXX */ 1930 break; 1931 if (m) { 1932 req = mtod(m, caddr_t); 1933 len = m->m_len; 1934 } 1935 error = ipsec6_set_policy(in6p, optname, req, 1936 len, privileged); 1937 m_freem(m); 1938 } 1939 break; 1940 #endif /* KAME IPSEC */ 1941 1942 case IPV6_FW_ADD: 1943 case IPV6_FW_DEL: 1944 case IPV6_FW_FLUSH: 1945 case IPV6_FW_ZERO: 1946 { 1947 struct mbuf *m; 1948 struct mbuf **mp = &m; 1949 1950 if (ip6_fw_ctl_ptr == NULL) 1951 return EINVAL; 1952 /* XXX */ 1953 if ((error = soopt_getm(sopt, &m)) != 0) 1954 break; 1955 /* XXX */ 1956 if ((error = soopt_mcopyin(sopt, m)) != 0) 1957 break; 1958 error = (*ip6_fw_ctl_ptr)(optname, mp); 1959 m = *mp; 1960 } 1961 break; 1962 1963 default: 1964 error = ENOPROTOOPT; 1965 break; 1966 } 1967 break; 1968 1969 case SOPT_GET: 1970 switch (optname) { 1971 1972 case IPV6_2292PKTOPTIONS: 1973 #ifdef IPV6_PKTOPTIONS 1974 case IPV6_PKTOPTIONS: 1975 #endif 1976 /* 1977 * RFC3542 (effectively) deprecated the 1978 * semantics of the 2292-style pktoptions. 1979 * Since it was not reliable in nature (i.e., 1980 * applications had to expect the lack of some 1981 * information after all), it would make sense 1982 * to simplify this part by always returning 1983 * empty data. 1984 */ 1985 sopt->sopt_valsize = 0; 1986 break; 1987 1988 case IPV6_RECVHOPOPTS: 1989 case IPV6_RECVDSTOPTS: 1990 case IPV6_RECVRTHDRDSTOPTS: 1991 case IPV6_UNICAST_HOPS: 1992 case IPV6_RECVPKTINFO: 1993 case IPV6_RECVHOPLIMIT: 1994 case IPV6_RECVRTHDR: 1995 case IPV6_RECVPATHMTU: 1996 1997 case IPV6_FAITH: 1998 case IPV6_V6ONLY: 1999 case IPV6_PORTRANGE: 2000 case IPV6_RECVTCLASS: 2001 case IPV6_AUTOFLOWLABEL: 2002 switch (optname) { 2003 2004 case IPV6_RECVHOPOPTS: 2005 optval = OPTBIT(IN6P_HOPOPTS); 2006 break; 2007 2008 case IPV6_RECVDSTOPTS: 2009 optval = OPTBIT(IN6P_DSTOPTS); 2010 break; 2011 2012 case IPV6_RECVRTHDRDSTOPTS: 2013 optval = OPTBIT(IN6P_RTHDRDSTOPTS); 2014 break; 2015 2016 case IPV6_UNICAST_HOPS: 2017 optval = in6p->in6p_hops; 2018 break; 2019 2020 case IPV6_RECVPKTINFO: 2021 optval = OPTBIT(IN6P_PKTINFO); 2022 break; 2023 2024 case IPV6_RECVHOPLIMIT: 2025 optval = OPTBIT(IN6P_HOPLIMIT); 2026 break; 2027 2028 case IPV6_RECVRTHDR: 2029 optval = OPTBIT(IN6P_RTHDR); 2030 break; 2031 2032 case IPV6_RECVPATHMTU: 2033 optval = OPTBIT(IN6P_MTU); 2034 break; 2035 2036 case IPV6_FAITH: 2037 optval = OPTBIT(IN6P_FAITH); 2038 break; 2039 2040 case IPV6_V6ONLY: 2041 optval = OPTBIT(IN6P_IPV6_V6ONLY); 2042 break; 2043 2044 case IPV6_PORTRANGE: 2045 { 2046 int flags; 2047 flags = in6p->in6p_flags; 2048 if (flags & IN6P_HIGHPORT) 2049 optval = IPV6_PORTRANGE_HIGH; 2050 else if (flags & IN6P_LOWPORT) 2051 optval = IPV6_PORTRANGE_LOW; 2052 else 2053 optval = 0; 2054 break; 2055 } 2056 case IPV6_RECVTCLASS: 2057 optval = OPTBIT(IN6P_TCLASS); 2058 break; 2059 2060 case IPV6_AUTOFLOWLABEL: 2061 optval = OPTBIT(IN6P_AUTOFLOWLABEL); 2062 break; 2063 } 2064 if (error) 2065 break; 2066 error = sooptcopyout(sopt, &optval, 2067 sizeof optval); 2068 break; 2069 2070 case IPV6_PATHMTU: 2071 { 2072 u_long pmtu = 0; 2073 struct ip6_mtuinfo mtuinfo; 2074 struct route_in6 sro; 2075 2076 bzero(&sro, sizeof(sro)); 2077 2078 if (!(so->so_state & SS_ISCONNECTED)) 2079 return (ENOTCONN); 2080 /* 2081 * XXX: we dot not consider the case of source 2082 * routing, or optional information to specify 2083 * the outgoing interface. 2084 */ 2085 error = ip6_getpmtu(&sro, NULL, NULL, 2086 &in6p->in6p_faddr, &pmtu, NULL); 2087 if (sro.ro_rt) 2088 RTFREE(sro.ro_rt); 2089 if (error) 2090 break; 2091 if (pmtu > IPV6_MAXPACKET) 2092 pmtu = IPV6_MAXPACKET; 2093 2094 bzero(&mtuinfo, sizeof(mtuinfo)); 2095 mtuinfo.ip6m_mtu = (u_int32_t)pmtu; 2096 optdata = (void *)&mtuinfo; 2097 optdatalen = sizeof(mtuinfo); 2098 error = sooptcopyout(sopt, optdata, 2099 optdatalen); 2100 break; 2101 } 2102 2103 case IPV6_2292PKTINFO: 2104 case IPV6_2292HOPLIMIT: 2105 case IPV6_2292HOPOPTS: 2106 case IPV6_2292RTHDR: 2107 case IPV6_2292DSTOPTS: 2108 switch (optname) { 2109 case IPV6_2292PKTINFO: 2110 optval = OPTBIT(IN6P_PKTINFO); 2111 break; 2112 case IPV6_2292HOPLIMIT: 2113 optval = OPTBIT(IN6P_HOPLIMIT); 2114 break; 2115 case IPV6_2292HOPOPTS: 2116 optval = OPTBIT(IN6P_HOPOPTS); 2117 break; 2118 case IPV6_2292RTHDR: 2119 optval = OPTBIT(IN6P_RTHDR); 2120 break; 2121 case IPV6_2292DSTOPTS: 2122 optval = OPTBIT(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); 2123 break; 2124 } 2125 error = sooptcopyout(sopt, &optval, 2126 sizeof optval); 2127 break; 2128 case IPV6_PKTINFO: 2129 case IPV6_HOPOPTS: 2130 case IPV6_RTHDR: 2131 case IPV6_DSTOPTS: 2132 case IPV6_RTHDRDSTOPTS: 2133 case IPV6_NEXTHOP: 2134 case IPV6_TCLASS: 2135 case IPV6_DONTFRAG: 2136 case IPV6_USE_MIN_MTU: 2137 case IPV6_PREFER_TEMPADDR: 2138 error = ip6_getpcbopt(in6p->in6p_outputopts, 2139 optname, sopt); 2140 break; 2141 2142 case IPV6_MULTICAST_IF: 2143 case IPV6_MULTICAST_HOPS: 2144 case IPV6_MULTICAST_LOOP: 2145 case IPV6_JOIN_GROUP: 2146 case IPV6_LEAVE_GROUP: 2147 { 2148 struct mbuf *m; 2149 error = ip6_getmoptions(sopt->sopt_name, 2150 in6p->in6p_moptions, &m); 2151 if (error == 0) 2152 error = sooptcopyout(sopt, 2153 mtod(m, char *), m->m_len); 2154 m_freem(m); 2155 } 2156 break; 2157 2158 #if defined(IPSEC) || defined(FAST_IPSEC) 2159 case IPV6_IPSEC_POLICY: 2160 { 2161 caddr_t req = NULL; 2162 size_t len = 0; 2163 struct mbuf *m = NULL; 2164 struct mbuf **mp = &m; 2165 size_t ovalsize = sopt->sopt_valsize; 2166 caddr_t oval = (caddr_t)sopt->sopt_val; 2167 2168 error = soopt_getm(sopt, &m); /* XXX */ 2169 if (error != 0) 2170 break; 2171 error = soopt_mcopyin(sopt, m); /* XXX */ 2172 if (error != 0) 2173 break; 2174 sopt->sopt_valsize = ovalsize; 2175 sopt->sopt_val = oval; 2176 if (m) { 2177 req = mtod(m, caddr_t); 2178 len = m->m_len; 2179 } 2180 error = ipsec6_get_policy(in6p, req, len, mp); 2181 if (error == 0) 2182 error = soopt_mcopyout(sopt, m); /* XXX */ 2183 if (error == 0 && m) 2184 m_freem(m); 2185 break; 2186 } 2187 #endif /* KAME IPSEC */ 2188 2189 case IPV6_FW_GET: 2190 { 2191 struct mbuf *m; 2192 struct mbuf **mp = &m; 2193 2194 if (ip6_fw_ctl_ptr == NULL) 2195 { 2196 return EINVAL; 2197 } 2198 error = (*ip6_fw_ctl_ptr)(optname, mp); 2199 if (error == 0) 2200 error = soopt_mcopyout(sopt, m); /* XXX */ 2201 if (error == 0 && m) 2202 m_freem(m); 2203 } 2204 break; 2205 2206 default: 2207 error = ENOPROTOOPT; 2208 break; 2209 } 2210 break; 2211 } 2212 } else { /* level != IPPROTO_IPV6 */ 2213 error = EINVAL; 2214 } 2215 return (error); 2216 } 2217 2218 int 2219 ip6_raw_ctloutput(so, sopt) 2220 struct socket *so; 2221 struct sockopt *sopt; 2222 { 2223 int error = 0, optval, optlen; 2224 const int icmp6off = offsetof(struct icmp6_hdr, icmp6_cksum); 2225 struct in6pcb *in6p = sotoin6pcb(so); 2226 int level, op, optname; 2227 2228 if (sopt) { 2229 level = sopt->sopt_level; 2230 op = sopt->sopt_dir; 2231 optname = sopt->sopt_name; 2232 optlen = sopt->sopt_valsize; 2233 } else 2234 panic("ip6_raw_ctloutput: arg soopt is NULL"); 2235 2236 if (level != IPPROTO_IPV6) { 2237 return (EINVAL); 2238 } 2239 2240 switch (optname) { 2241 case IPV6_CHECKSUM: 2242 /* 2243 * For ICMPv6 sockets, no modification allowed for checksum 2244 * offset, permit "no change" values to help existing apps. 2245 * 2246 * RFC3542 says: "An attempt to set IPV6_CHECKSUM 2247 * for an ICMPv6 socket will fail." 2248 * The current behavior does not meet RFC3542. 2249 */ 2250 switch (op) { 2251 case SOPT_SET: 2252 if (optlen != sizeof(int)) { 2253 error = EINVAL; 2254 break; 2255 } 2256 error = sooptcopyin(sopt, &optval, sizeof(optval), 2257 sizeof(optval)); 2258 if (error) 2259 break; 2260 if ((optval % 2) != 0) { 2261 /* the API assumes even offset values */ 2262 error = EINVAL; 2263 } else if (so->so_proto->pr_protocol == 2264 IPPROTO_ICMPV6) { 2265 if (optval != icmp6off) 2266 error = EINVAL; 2267 } else 2268 in6p->in6p_cksum = optval; 2269 break; 2270 2271 case SOPT_GET: 2272 if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) 2273 optval = icmp6off; 2274 else 2275 optval = in6p->in6p_cksum; 2276 2277 error = sooptcopyout(sopt, &optval, sizeof(optval)); 2278 break; 2279 2280 default: 2281 error = EINVAL; 2282 break; 2283 } 2284 break; 2285 2286 default: 2287 error = ENOPROTOOPT; 2288 break; 2289 } 2290 2291 return (error); 2292 } 2293 2294 /* 2295 * Set up IP6 options in pcb for insertion in output packets or 2296 * specifying behavior of outgoing packets. 2297 */ 2298 static int 2299 ip6_pcbopts(pktopt, m, so, sopt) 2300 struct ip6_pktopts **pktopt; 2301 struct mbuf *m; 2302 struct socket *so; 2303 struct sockopt *sopt; 2304 { 2305 struct ip6_pktopts *opt = *pktopt; 2306 int error = 0; 2307 struct thread *td = sopt->sopt_td; 2308 int priv = 0; 2309 2310 /* turn off any old options. */ 2311 if (opt) { 2312 #ifdef DIAGNOSTIC 2313 if (opt->ip6po_pktinfo || opt->ip6po_nexthop || 2314 opt->ip6po_hbh || opt->ip6po_dest1 || opt->ip6po_dest2 || 2315 opt->ip6po_rhinfo.ip6po_rhi_rthdr) 2316 printf("ip6_pcbopts: all specified options are cleared.\n"); 2317 #endif 2318 ip6_clearpktopts(opt, -1); 2319 } else 2320 opt = malloc(sizeof(*opt), M_IP6OPT, M_WAITOK); 2321 *pktopt = NULL; 2322 2323 if (!m || m->m_len == 0) { 2324 /* 2325 * Only turning off any previous options, regardless of 2326 * whether the opt is just created or given. 2327 */ 2328 free(opt, M_IP6OPT); 2329 return (0); 2330 } 2331 2332 /* set options specified by user. */ 2333 if (td && !suser(td)) 2334 priv = 1; 2335 if ((error = ip6_setpktopts(m, opt, NULL, priv, 1, 2336 so->so_proto->pr_protocol)) != 0) { 2337 ip6_clearpktopts(opt, -1); /* XXX: discard all options */ 2338 free(opt, M_IP6OPT); 2339 return (error); 2340 } 2341 *pktopt = opt; 2342 return (0); 2343 } 2344 2345 /* 2346 * initialize ip6_pktopts. beware that there are non-zero default values in 2347 * the struct. 2348 */ 2349 void 2350 ip6_initpktopts(opt) 2351 struct ip6_pktopts *opt; 2352 { 2353 2354 bzero(opt, sizeof(*opt)); 2355 opt->ip6po_hlim = -1; /* -1 means default hop limit */ 2356 opt->ip6po_tclass = -1; /* -1 means default traffic class */ 2357 opt->ip6po_minmtu = IP6PO_MINMTU_MCASTONLY; 2358 opt->ip6po_prefer_tempaddr = IP6PO_TEMPADDR_SYSTEM; 2359 } 2360 2361 static int 2362 ip6_pcbopt(optname, buf, len, pktopt, priv, uproto) 2363 int optname, len, priv; 2364 u_char *buf; 2365 struct ip6_pktopts **pktopt; 2366 int uproto; 2367 { 2368 struct ip6_pktopts *opt; 2369 2370 if (*pktopt == NULL) { 2371 *pktopt = malloc(sizeof(struct ip6_pktopts), M_IP6OPT, 2372 M_WAITOK); 2373 ip6_initpktopts(*pktopt); 2374 (*pktopt)->needfree = 1; 2375 } 2376 opt = *pktopt; 2377 2378 return (ip6_setpktopt(optname, buf, len, opt, priv, 1, 0, uproto)); 2379 } 2380 2381 static int 2382 ip6_getpcbopt(pktopt, optname, sopt) 2383 struct ip6_pktopts *pktopt; 2384 struct sockopt *sopt; 2385 int optname; 2386 { 2387 void *optdata = NULL; 2388 int optdatalen = 0; 2389 struct ip6_ext *ip6e; 2390 int error = 0; 2391 struct in6_pktinfo null_pktinfo; 2392 int deftclass = 0, on; 2393 int defminmtu = IP6PO_MINMTU_MCASTONLY; 2394 int defpreftemp = IP6PO_TEMPADDR_SYSTEM; 2395 2396 switch (optname) { 2397 case IPV6_PKTINFO: 2398 if (pktopt && pktopt->ip6po_pktinfo) 2399 optdata = (void *)pktopt->ip6po_pktinfo; 2400 else { 2401 /* XXX: we don't have to do this every time... */ 2402 bzero(&null_pktinfo, sizeof(null_pktinfo)); 2403 optdata = (void *)&null_pktinfo; 2404 } 2405 optdatalen = sizeof(struct in6_pktinfo); 2406 break; 2407 case IPV6_TCLASS: 2408 if (pktopt && pktopt->ip6po_tclass >= 0) 2409 optdata = (void *)&pktopt->ip6po_tclass; 2410 else 2411 optdata = (void *)&deftclass; 2412 optdatalen = sizeof(int); 2413 break; 2414 case IPV6_HOPOPTS: 2415 if (pktopt && pktopt->ip6po_hbh) { 2416 optdata = (void *)pktopt->ip6po_hbh; 2417 ip6e = (struct ip6_ext *)pktopt->ip6po_hbh; 2418 optdatalen = (ip6e->ip6e_len + 1) << 3; 2419 } 2420 break; 2421 case IPV6_RTHDR: 2422 if (pktopt && pktopt->ip6po_rthdr) { 2423 optdata = (void *)pktopt->ip6po_rthdr; 2424 ip6e = (struct ip6_ext *)pktopt->ip6po_rthdr; 2425 optdatalen = (ip6e->ip6e_len + 1) << 3; 2426 } 2427 break; 2428 case IPV6_RTHDRDSTOPTS: 2429 if (pktopt && pktopt->ip6po_dest1) { 2430 optdata = (void *)pktopt->ip6po_dest1; 2431 ip6e = (struct ip6_ext *)pktopt->ip6po_dest1; 2432 optdatalen = (ip6e->ip6e_len + 1) << 3; 2433 } 2434 break; 2435 case IPV6_DSTOPTS: 2436 if (pktopt && pktopt->ip6po_dest2) { 2437 optdata = (void *)pktopt->ip6po_dest2; 2438 ip6e = (struct ip6_ext *)pktopt->ip6po_dest2; 2439 optdatalen = (ip6e->ip6e_len + 1) << 3; 2440 } 2441 break; 2442 case IPV6_NEXTHOP: 2443 if (pktopt && pktopt->ip6po_nexthop) { 2444 optdata = (void *)pktopt->ip6po_nexthop; 2445 optdatalen = pktopt->ip6po_nexthop->sa_len; 2446 } 2447 break; 2448 case IPV6_USE_MIN_MTU: 2449 if (pktopt) 2450 optdata = (void *)&pktopt->ip6po_minmtu; 2451 else 2452 optdata = (void *)&defminmtu; 2453 optdatalen = sizeof(int); 2454 break; 2455 case IPV6_DONTFRAG: 2456 if (pktopt && ((pktopt->ip6po_flags) & IP6PO_DONTFRAG)) 2457 on = 1; 2458 else 2459 on = 0; 2460 optdata = (void *)&on; 2461 optdatalen = sizeof(on); 2462 break; 2463 case IPV6_PREFER_TEMPADDR: 2464 if (pktopt) 2465 optdata = (void *)&pktopt->ip6po_prefer_tempaddr; 2466 else 2467 optdata = (void *)&defpreftemp; 2468 optdatalen = sizeof(int); 2469 break; 2470 default: /* should not happen */ 2471 #ifdef DIAGNOSTIC 2472 panic("ip6_getpcbopt: unexpected option\n"); 2473 #endif 2474 return (ENOPROTOOPT); 2475 } 2476 2477 error = sooptcopyout(sopt, optdata, optdatalen); 2478 2479 return (error); 2480 } 2481 2482 void 2483 ip6_clearpktopts(pktopt, optname) 2484 struct ip6_pktopts *pktopt; 2485 int optname; 2486 { 2487 int needfree; 2488 2489 if (pktopt == NULL) 2490 return; 2491 2492 needfree = pktopt->needfree; 2493 2494 if (optname == -1 || optname == IPV6_PKTINFO) { 2495 if (needfree && pktopt->ip6po_pktinfo) 2496 free(pktopt->ip6po_pktinfo, M_IP6OPT); 2497 pktopt->ip6po_pktinfo = NULL; 2498 } 2499 if (optname == -1 || optname == IPV6_HOPLIMIT) 2500 pktopt->ip6po_hlim = -1; 2501 if (optname == -1 || optname == IPV6_TCLASS) 2502 pktopt->ip6po_tclass = -1; 2503 if (optname == -1 || optname == IPV6_NEXTHOP) { 2504 if (pktopt->ip6po_nextroute.ro_rt) { 2505 RTFREE(pktopt->ip6po_nextroute.ro_rt); 2506 pktopt->ip6po_nextroute.ro_rt = NULL; 2507 } 2508 if (needfree && pktopt->ip6po_nexthop) 2509 free(pktopt->ip6po_nexthop, M_IP6OPT); 2510 pktopt->ip6po_nexthop = NULL; 2511 } 2512 if (optname == -1 || optname == IPV6_HOPOPTS) { 2513 if (needfree && pktopt->ip6po_hbh) 2514 free(pktopt->ip6po_hbh, M_IP6OPT); 2515 pktopt->ip6po_hbh = NULL; 2516 } 2517 if (optname == -1 || optname == IPV6_RTHDRDSTOPTS) { 2518 if (needfree && pktopt->ip6po_dest1) 2519 free(pktopt->ip6po_dest1, M_IP6OPT); 2520 pktopt->ip6po_dest1 = NULL; 2521 } 2522 if (optname == -1 || optname == IPV6_RTHDR) { 2523 if (needfree && pktopt->ip6po_rhinfo.ip6po_rhi_rthdr) 2524 free(pktopt->ip6po_rhinfo.ip6po_rhi_rthdr, M_IP6OPT); 2525 pktopt->ip6po_rhinfo.ip6po_rhi_rthdr = NULL; 2526 if (pktopt->ip6po_route.ro_rt) { 2527 RTFREE(pktopt->ip6po_route.ro_rt); 2528 pktopt->ip6po_route.ro_rt = NULL; 2529 } 2530 } 2531 if (optname == -1 || optname == IPV6_DSTOPTS) { 2532 if (needfree && pktopt->ip6po_dest2) 2533 free(pktopt->ip6po_dest2, M_IP6OPT); 2534 pktopt->ip6po_dest2 = NULL; 2535 } 2536 } 2537 2538 #define PKTOPT_EXTHDRCPY(type) \ 2539 do {\ 2540 if (src->type) {\ 2541 int hlen = (((struct ip6_ext *)src->type)->ip6e_len + 1) << 3;\ 2542 dst->type = malloc(hlen, M_IP6OPT, canwait);\ 2543 if (dst->type == NULL && canwait == M_NOWAIT)\ 2544 goto bad;\ 2545 bcopy(src->type, dst->type, hlen);\ 2546 }\ 2547 } while (/*CONSTCOND*/ 0) 2548 2549 struct ip6_pktopts * 2550 ip6_copypktopts(src, canwait) 2551 struct ip6_pktopts *src; 2552 int canwait; 2553 { 2554 struct ip6_pktopts *dst; 2555 2556 if (src == NULL) { 2557 printf("ip6_clearpktopts: invalid argument\n"); 2558 return (NULL); 2559 } 2560 2561 dst = malloc(sizeof(*dst), M_IP6OPT, canwait); 2562 if (dst == NULL && canwait == M_NOWAIT) 2563 return (NULL); 2564 bzero(dst, sizeof(*dst)); 2565 dst->needfree = 1; 2566 2567 dst->ip6po_hlim = src->ip6po_hlim; 2568 dst->ip6po_tclass = src->ip6po_tclass; 2569 dst->ip6po_flags = src->ip6po_flags; 2570 if (src->ip6po_pktinfo) { 2571 dst->ip6po_pktinfo = malloc(sizeof(*dst->ip6po_pktinfo), 2572 M_IP6OPT, canwait); 2573 if (dst->ip6po_pktinfo == NULL && canwait == M_NOWAIT) 2574 goto bad; 2575 *dst->ip6po_pktinfo = *src->ip6po_pktinfo; 2576 } 2577 if (src->ip6po_nexthop) { 2578 dst->ip6po_nexthop = malloc(src->ip6po_nexthop->sa_len, 2579 M_IP6OPT, canwait); 2580 if (dst->ip6po_nexthop == NULL) 2581 goto bad; 2582 bcopy(src->ip6po_nexthop, dst->ip6po_nexthop, 2583 src->ip6po_nexthop->sa_len); 2584 } 2585 PKTOPT_EXTHDRCPY(ip6po_hbh); 2586 PKTOPT_EXTHDRCPY(ip6po_dest1); 2587 PKTOPT_EXTHDRCPY(ip6po_dest2); 2588 PKTOPT_EXTHDRCPY(ip6po_rthdr); /* not copy the cached route */ 2589 return (dst); 2590 2591 bad: 2592 if (dst->ip6po_pktinfo) free(dst->ip6po_pktinfo, M_IP6OPT); 2593 if (dst->ip6po_nexthop) free(dst->ip6po_nexthop, M_IP6OPT); 2594 if (dst->ip6po_hbh) free(dst->ip6po_hbh, M_IP6OPT); 2595 if (dst->ip6po_dest1) free(dst->ip6po_dest1, M_IP6OPT); 2596 if (dst->ip6po_dest2) free(dst->ip6po_dest2, M_IP6OPT); 2597 if (dst->ip6po_rthdr) free(dst->ip6po_rthdr, M_IP6OPT); 2598 free(dst, M_IP6OPT); 2599 return (NULL); 2600 } 2601 #undef PKTOPT_EXTHDRCPY 2602 2603 void 2604 ip6_freepcbopts(pktopt) 2605 struct ip6_pktopts *pktopt; 2606 { 2607 if (pktopt == NULL) 2608 return; 2609 2610 ip6_clearpktopts(pktopt, -1); 2611 2612 free(pktopt, M_IP6OPT); 2613 } 2614 2615 /* 2616 * Set the IP6 multicast options in response to user setsockopt(). 2617 */ 2618 static int 2619 ip6_setmoptions(optname, im6op, m) 2620 int optname; 2621 struct ip6_moptions **im6op; 2622 struct mbuf *m; 2623 { 2624 int error = 0; 2625 u_int loop, ifindex; 2626 struct ipv6_mreq *mreq; 2627 struct ifnet *ifp; 2628 struct ip6_moptions *im6o = *im6op; 2629 struct route_in6 ro; 2630 struct sockaddr_in6 *dst; 2631 struct in6_multi_mship *imm; 2632 struct thread *td = curthread; 2633 2634 if (im6o == NULL) { 2635 /* 2636 * No multicast option buffer attached to the pcb; 2637 * allocate one and initialize to default values. 2638 */ 2639 im6o = (struct ip6_moptions *) 2640 malloc(sizeof(*im6o), M_IPMOPTS, M_WAITOK); 2641 2642 if (im6o == NULL) 2643 return (ENOBUFS); 2644 *im6op = im6o; 2645 im6o->im6o_multicast_ifp = NULL; 2646 im6o->im6o_multicast_hlim = ip6_defmcasthlim; 2647 im6o->im6o_multicast_loop = IPV6_DEFAULT_MULTICAST_LOOP; 2648 LIST_INIT(&im6o->im6o_memberships); 2649 } 2650 2651 switch (optname) { 2652 2653 case IPV6_MULTICAST_IF: 2654 /* 2655 * Select the interface for outgoing multicast packets. 2656 */ 2657 if (m == NULL || m->m_len != sizeof(u_int)) { 2658 error = EINVAL; 2659 break; 2660 } 2661 bcopy(mtod(m, u_int *), &ifindex, sizeof(ifindex)); 2662 if (ifindex < 0 || if_index < ifindex) { 2663 error = ENXIO; /* XXX EINVAL? */ 2664 break; 2665 } 2666 ifp = ifnet_byindex(ifindex); 2667 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0) { 2668 error = EADDRNOTAVAIL; 2669 break; 2670 } 2671 im6o->im6o_multicast_ifp = ifp; 2672 break; 2673 2674 case IPV6_MULTICAST_HOPS: 2675 { 2676 /* 2677 * Set the IP6 hoplimit for outgoing multicast packets. 2678 */ 2679 int optval; 2680 if (m == NULL || m->m_len != sizeof(int)) { 2681 error = EINVAL; 2682 break; 2683 } 2684 bcopy(mtod(m, u_int *), &optval, sizeof(optval)); 2685 if (optval < -1 || optval >= 256) 2686 error = EINVAL; 2687 else if (optval == -1) 2688 im6o->im6o_multicast_hlim = ip6_defmcasthlim; 2689 else 2690 im6o->im6o_multicast_hlim = optval; 2691 break; 2692 } 2693 2694 case IPV6_MULTICAST_LOOP: 2695 /* 2696 * Set the loopback flag for outgoing multicast packets. 2697 * Must be zero or one. 2698 */ 2699 if (m == NULL || m->m_len != sizeof(u_int)) { 2700 error = EINVAL; 2701 break; 2702 } 2703 bcopy(mtod(m, u_int *), &loop, sizeof(loop)); 2704 if (loop > 1) { 2705 error = EINVAL; 2706 break; 2707 } 2708 im6o->im6o_multicast_loop = loop; 2709 break; 2710 2711 case IPV6_JOIN_GROUP: 2712 /* 2713 * Add a multicast group membership. 2714 * Group must be a valid IP6 multicast address. 2715 */ 2716 if (m == NULL || m->m_len != sizeof(struct ipv6_mreq)) { 2717 error = EINVAL; 2718 break; 2719 } 2720 mreq = mtod(m, struct ipv6_mreq *); 2721 if (IN6_IS_ADDR_UNSPECIFIED(&mreq->ipv6mr_multiaddr)) { 2722 /* 2723 * We use the unspecified address to specify to accept 2724 * all multicast addresses. Only super user is allowed 2725 * to do this. 2726 */ 2727 if (suser(td)) { 2728 error = EACCES; 2729 break; 2730 } 2731 } else if (!IN6_IS_ADDR_MULTICAST(&mreq->ipv6mr_multiaddr)) { 2732 error = EINVAL; 2733 break; 2734 } 2735 2736 /* 2737 * If the interface is specified, validate it. 2738 */ 2739 if (mreq->ipv6mr_interface < 0 || 2740 if_index < mreq->ipv6mr_interface) { 2741 error = ENXIO; /* XXX EINVAL? */ 2742 break; 2743 } 2744 /* 2745 * If no interface was explicitly specified, choose an 2746 * appropriate one according to the given multicast address. 2747 */ 2748 if (mreq->ipv6mr_interface == 0) { 2749 /* 2750 * If the multicast address is in node-local scope, 2751 * the interface should be a loopback interface. 2752 * Otherwise, look up the routing table for the 2753 * address, and choose the outgoing interface. 2754 * XXX: is it a good approach? 2755 */ 2756 if (IN6_IS_ADDR_MC_INTFACELOCAL(&mreq->ipv6mr_multiaddr)) { 2757 ifp = &loif[0]; 2758 } else { 2759 ro.ro_rt = NULL; 2760 dst = (struct sockaddr_in6 *)&ro.ro_dst; 2761 bzero(dst, sizeof(*dst)); 2762 dst->sin6_len = sizeof(struct sockaddr_in6); 2763 dst->sin6_family = AF_INET6; 2764 dst->sin6_addr = mreq->ipv6mr_multiaddr; 2765 rtalloc((struct route *)&ro); 2766 if (ro.ro_rt == NULL) { 2767 error = EADDRNOTAVAIL; 2768 break; 2769 } 2770 ifp = ro.ro_rt->rt_ifp; 2771 RTFREE(ro.ro_rt); 2772 } 2773 } else 2774 ifp = ifnet_byindex(mreq->ipv6mr_interface); 2775 2776 /* 2777 * See if we found an interface, and confirm that it 2778 * supports multicast 2779 */ 2780 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0) { 2781 error = EADDRNOTAVAIL; 2782 break; 2783 } 2784 /* 2785 * Put interface index into the multicast address, 2786 * if the address has link-local scope. 2787 */ 2788 if (IN6_IS_ADDR_MC_LINKLOCAL(&mreq->ipv6mr_multiaddr)) { 2789 mreq->ipv6mr_multiaddr.s6_addr16[1] = 2790 htons(ifp->if_index); 2791 } 2792 /* 2793 * See if the membership already exists. 2794 */ 2795 for (imm = im6o->im6o_memberships.lh_first; 2796 imm != NULL; imm = imm->i6mm_chain.le_next) 2797 if (imm->i6mm_maddr->in6m_ifp == ifp && 2798 IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr, 2799 &mreq->ipv6mr_multiaddr)) 2800 break; 2801 if (imm != NULL) { 2802 error = EADDRINUSE; 2803 break; 2804 } 2805 /* 2806 * Everything looks good; add a new record to the multicast 2807 * address list for the given interface. 2808 */ 2809 imm = malloc(sizeof(*imm), M_IPMADDR, M_WAITOK); 2810 if (imm == NULL) { 2811 error = ENOBUFS; 2812 break; 2813 } 2814 if ((imm->i6mm_maddr = 2815 in6_addmulti(&mreq->ipv6mr_multiaddr, ifp, &error)) == NULL) { 2816 free(imm, M_IPMADDR); 2817 break; 2818 } 2819 LIST_INSERT_HEAD(&im6o->im6o_memberships, imm, i6mm_chain); 2820 break; 2821 2822 case IPV6_LEAVE_GROUP: 2823 /* 2824 * Drop a multicast group membership. 2825 * Group must be a valid IP6 multicast address. 2826 */ 2827 if (m == NULL || m->m_len != sizeof(struct ipv6_mreq)) { 2828 error = EINVAL; 2829 break; 2830 } 2831 mreq = mtod(m, struct ipv6_mreq *); 2832 if (IN6_IS_ADDR_UNSPECIFIED(&mreq->ipv6mr_multiaddr)) { 2833 if (suser(td)) { 2834 error = EACCES; 2835 break; 2836 } 2837 } else if (!IN6_IS_ADDR_MULTICAST(&mreq->ipv6mr_multiaddr)) { 2838 error = EINVAL; 2839 break; 2840 } 2841 /* 2842 * If an interface address was specified, get a pointer 2843 * to its ifnet structure. 2844 */ 2845 if (mreq->ipv6mr_interface < 0 2846 || if_index < mreq->ipv6mr_interface) { 2847 error = ENXIO; /* XXX EINVAL? */ 2848 break; 2849 } 2850 ifp = ifnet_byindex(mreq->ipv6mr_interface); 2851 /* 2852 * Put interface index into the multicast address, 2853 * if the address has link-local scope. 2854 */ 2855 if (IN6_IS_ADDR_MC_LINKLOCAL(&mreq->ipv6mr_multiaddr)) { 2856 mreq->ipv6mr_multiaddr.s6_addr16[1] 2857 = htons(mreq->ipv6mr_interface); 2858 } 2859 2860 /* 2861 * Find the membership in the membership list. 2862 */ 2863 for (imm = im6o->im6o_memberships.lh_first; 2864 imm != NULL; imm = imm->i6mm_chain.le_next) { 2865 if ((ifp == NULL || imm->i6mm_maddr->in6m_ifp == ifp) && 2866 IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr, 2867 &mreq->ipv6mr_multiaddr)) 2868 break; 2869 } 2870 if (imm == NULL) { 2871 /* Unable to resolve interface */ 2872 error = EADDRNOTAVAIL; 2873 break; 2874 } 2875 /* 2876 * Give up the multicast address record to which the 2877 * membership points. 2878 */ 2879 LIST_REMOVE(imm, i6mm_chain); 2880 in6_delmulti(imm->i6mm_maddr); 2881 free(imm, M_IPMADDR); 2882 break; 2883 2884 default: 2885 error = EOPNOTSUPP; 2886 break; 2887 } 2888 2889 /* 2890 * If all options have default values, no need to keep the mbuf. 2891 */ 2892 if (im6o->im6o_multicast_ifp == NULL && 2893 im6o->im6o_multicast_hlim == ip6_defmcasthlim && 2894 im6o->im6o_multicast_loop == IPV6_DEFAULT_MULTICAST_LOOP && 2895 im6o->im6o_memberships.lh_first == NULL) { 2896 free(*im6op, M_IPMOPTS); 2897 *im6op = NULL; 2898 } 2899 2900 return (error); 2901 } 2902 2903 /* 2904 * Return the IP6 multicast options in response to user getsockopt(). 2905 */ 2906 static int 2907 ip6_getmoptions(optname, im6o, mp) 2908 int optname; 2909 struct ip6_moptions *im6o; 2910 struct mbuf **mp; 2911 { 2912 u_int *hlim, *loop, *ifindex; 2913 2914 *mp = m_get(M_TRYWAIT, MT_HEADER); /* XXX */ 2915 2916 switch (optname) { 2917 2918 case IPV6_MULTICAST_IF: 2919 ifindex = mtod(*mp, u_int *); 2920 (*mp)->m_len = sizeof(u_int); 2921 if (im6o == NULL || im6o->im6o_multicast_ifp == NULL) 2922 *ifindex = 0; 2923 else 2924 *ifindex = im6o->im6o_multicast_ifp->if_index; 2925 return (0); 2926 2927 case IPV6_MULTICAST_HOPS: 2928 hlim = mtod(*mp, u_int *); 2929 (*mp)->m_len = sizeof(u_int); 2930 if (im6o == NULL) 2931 *hlim = ip6_defmcasthlim; 2932 else 2933 *hlim = im6o->im6o_multicast_hlim; 2934 return (0); 2935 2936 case IPV6_MULTICAST_LOOP: 2937 loop = mtod(*mp, u_int *); 2938 (*mp)->m_len = sizeof(u_int); 2939 if (im6o == NULL) 2940 *loop = ip6_defmcasthlim; 2941 else 2942 *loop = im6o->im6o_multicast_loop; 2943 return (0); 2944 2945 default: 2946 return (EOPNOTSUPP); 2947 } 2948 } 2949 2950 /* 2951 * Discard the IP6 multicast options. 2952 */ 2953 void 2954 ip6_freemoptions(im6o) 2955 struct ip6_moptions *im6o; 2956 { 2957 struct in6_multi_mship *imm; 2958 2959 if (im6o == NULL) 2960 return; 2961 2962 while ((imm = im6o->im6o_memberships.lh_first) != NULL) { 2963 LIST_REMOVE(imm, i6mm_chain); 2964 if (imm->i6mm_maddr) 2965 in6_delmulti(imm->i6mm_maddr); 2966 free(imm, M_IPMADDR); 2967 } 2968 free(im6o, M_IPMOPTS); 2969 } 2970 2971 /* 2972 * Set IPv6 outgoing packet options based on advanced API. 2973 */ 2974 int 2975 ip6_setpktopts(control, opt, stickyopt, priv, needcopy, uproto) 2976 struct mbuf *control; 2977 struct ip6_pktopts *opt, *stickyopt; 2978 int priv, needcopy, uproto; 2979 { 2980 struct cmsghdr *cm = 0; 2981 2982 if (control == NULL || opt == NULL) 2983 return (EINVAL); 2984 2985 if (stickyopt) { 2986 /* 2987 * If stickyopt is provided, make a local copy of the options 2988 * for this particular packet, then override them by ancillary 2989 * objects. 2990 * XXX: need to gain a reference for the cached route of the 2991 * next hop in case of the overriding. 2992 */ 2993 *opt = *stickyopt; 2994 if (opt->ip6po_nextroute.ro_rt) { 2995 RT_LOCK(opt->ip6po_nextroute.ro_rt); 2996 RT_ADDREF(opt->ip6po_nextroute.ro_rt); 2997 RT_UNLOCK(opt->ip6po_nextroute.ro_rt); 2998 } 2999 } else 3000 ip6_initpktopts(opt); 3001 opt->needfree = needcopy; 3002 3003 /* 3004 * XXX: Currently, we assume all the optional information is stored 3005 * in a single mbuf. 3006 */ 3007 if (control->m_next) 3008 return (EINVAL); 3009 3010 for (; control->m_len; control->m_data += CMSG_ALIGN(cm->cmsg_len), 3011 control->m_len -= CMSG_ALIGN(cm->cmsg_len)) { 3012 int error; 3013 3014 if (control->m_len < CMSG_LEN(0)) 3015 return (EINVAL); 3016 3017 cm = mtod(control, struct cmsghdr *); 3018 if (cm->cmsg_len == 0 || cm->cmsg_len > control->m_len) 3019 return (EINVAL); 3020 if (cm->cmsg_level != IPPROTO_IPV6) 3021 continue; 3022 3023 error = ip6_setpktopt(cm->cmsg_type, CMSG_DATA(cm), 3024 cm->cmsg_len - CMSG_LEN(0), opt, priv, needcopy, 1, uproto); 3025 if (error) 3026 return (error); 3027 } 3028 3029 return (0); 3030 } 3031 3032 /* 3033 * Set a particular packet option, as a sticky option or an ancillary data 3034 * item. "len" can be 0 only when it's a sticky option. 3035 * We have 4 cases of combination of "sticky" and "cmsg": 3036 * "sticky=0, cmsg=0": impossible 3037 * "sticky=0, cmsg=1": RFC2292 or RFC3542 ancillary data 3038 * "sticky=1, cmsg=0": RFC3542 socket option 3039 * "sticky=1, cmsg=1": RFC2292 socket option 3040 */ 3041 static int 3042 ip6_setpktopt(optname, buf, len, opt, priv, sticky, cmsg, uproto) 3043 int optname, len, priv, sticky, cmsg, uproto; 3044 u_char *buf; 3045 struct ip6_pktopts *opt; 3046 { 3047 int minmtupolicy, preftemp; 3048 3049 if (!sticky && !cmsg) { 3050 #ifdef DIAGNOSTIC 3051 printf("ip6_setpktopt: impossible case\n"); 3052 #endif 3053 return (EINVAL); 3054 } 3055 3056 /* 3057 * IPV6_2292xxx is for backward compatibility to RFC2292, and should 3058 * not be specified in the context of RFC3542. Conversely, 3059 * RFC3542 types should not be specified in the context of RFC2292. 3060 */ 3061 if (!cmsg) { 3062 switch (optname) { 3063 case IPV6_2292PKTINFO: 3064 case IPV6_2292HOPLIMIT: 3065 case IPV6_2292NEXTHOP: 3066 case IPV6_2292HOPOPTS: 3067 case IPV6_2292DSTOPTS: 3068 case IPV6_2292RTHDR: 3069 case IPV6_2292PKTOPTIONS: 3070 return (ENOPROTOOPT); 3071 } 3072 } 3073 if (sticky && cmsg) { 3074 switch (optname) { 3075 case IPV6_PKTINFO: 3076 case IPV6_HOPLIMIT: 3077 case IPV6_NEXTHOP: 3078 case IPV6_HOPOPTS: 3079 case IPV6_DSTOPTS: 3080 case IPV6_RTHDRDSTOPTS: 3081 case IPV6_RTHDR: 3082 case IPV6_USE_MIN_MTU: 3083 case IPV6_DONTFRAG: 3084 case IPV6_TCLASS: 3085 case IPV6_PREFER_TEMPADDR: /* XXX: not an RFC3542 option */ 3086 return (ENOPROTOOPT); 3087 } 3088 } 3089 3090 switch (optname) { 3091 case IPV6_2292PKTINFO: 3092 case IPV6_PKTINFO: 3093 { 3094 struct ifnet *ifp = NULL; 3095 struct in6_pktinfo *pktinfo; 3096 3097 if (len != sizeof(struct in6_pktinfo)) 3098 return (EINVAL); 3099 3100 pktinfo = (struct in6_pktinfo *)buf; 3101 3102 /* 3103 * An application can clear any sticky IPV6_PKTINFO option by 3104 * doing a "regular" setsockopt with ipi6_addr being 3105 * in6addr_any and ipi6_ifindex being zero. 3106 * [RFC 3542, Section 6] 3107 */ 3108 if (optname == IPV6_PKTINFO && opt->ip6po_pktinfo && 3109 pktinfo->ipi6_ifindex == 0 && 3110 IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) { 3111 ip6_clearpktopts(opt, optname); 3112 break; 3113 } 3114 3115 if (uproto == IPPROTO_TCP && optname == IPV6_PKTINFO && 3116 sticky && !IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) { 3117 return (EINVAL); 3118 } 3119 3120 /* validate the interface index if specified. */ 3121 if (pktinfo->ipi6_ifindex > if_index || 3122 pktinfo->ipi6_ifindex < 0) { 3123 return (ENXIO); 3124 } 3125 if (pktinfo->ipi6_ifindex) { 3126 ifp = ifnet_byindex(pktinfo->ipi6_ifindex); 3127 if (ifp == NULL) 3128 return (ENXIO); 3129 } 3130 3131 /* 3132 * We store the address anyway, and let in6_selectsrc() 3133 * validate the specified address. This is because ipi6_addr 3134 * may not have enough information about its scope zone, and 3135 * we may need additional information (such as outgoing 3136 * interface or the scope zone of a destination address) to 3137 * disambiguate the scope. 3138 * XXX: the delay of the validation may confuse the 3139 * application when it is used as a sticky option. 3140 */ 3141 if (sticky) { 3142 if (opt->ip6po_pktinfo == NULL) { 3143 opt->ip6po_pktinfo = malloc(sizeof(*pktinfo), 3144 M_IP6OPT, M_WAITOK); 3145 } 3146 bcopy(pktinfo, opt->ip6po_pktinfo, sizeof(*pktinfo)); 3147 } else 3148 opt->ip6po_pktinfo = pktinfo; 3149 break; 3150 } 3151 3152 case IPV6_2292HOPLIMIT: 3153 case IPV6_HOPLIMIT: 3154 { 3155 int *hlimp; 3156 3157 /* 3158 * RFC 3542 deprecated the usage of sticky IPV6_HOPLIMIT 3159 * to simplify the ordering among hoplimit options. 3160 */ 3161 if (optname == IPV6_HOPLIMIT && sticky) 3162 return (ENOPROTOOPT); 3163 3164 if (len != sizeof(int)) 3165 return (EINVAL); 3166 hlimp = (int *)buf; 3167 if (*hlimp < -1 || *hlimp > 255) 3168 return (EINVAL); 3169 3170 opt->ip6po_hlim = *hlimp; 3171 break; 3172 } 3173 3174 case IPV6_TCLASS: 3175 { 3176 int tclass; 3177 3178 if (len != sizeof(int)) 3179 return (EINVAL); 3180 tclass = *(int *)buf; 3181 if (tclass < -1 || tclass > 255) 3182 return (EINVAL); 3183 3184 opt->ip6po_tclass = tclass; 3185 break; 3186 } 3187 3188 case IPV6_2292NEXTHOP: 3189 case IPV6_NEXTHOP: 3190 if (!priv) 3191 return (EPERM); 3192 3193 if (len == 0) { /* just remove the option */ 3194 ip6_clearpktopts(opt, IPV6_NEXTHOP); 3195 break; 3196 } 3197 3198 /* check if cmsg_len is large enough for sa_len */ 3199 if (len < sizeof(struct sockaddr) || len < *buf) 3200 return (EINVAL); 3201 3202 switch (((struct sockaddr *)buf)->sa_family) { 3203 case AF_INET6: 3204 { 3205 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)buf; 3206 #if 0 3207 int error; 3208 #endif 3209 3210 if (sa6->sin6_len != sizeof(struct sockaddr_in6)) 3211 return (EINVAL); 3212 3213 if (IN6_IS_ADDR_UNSPECIFIED(&sa6->sin6_addr) || 3214 IN6_IS_ADDR_MULTICAST(&sa6->sin6_addr)) { 3215 return (EINVAL); 3216 } 3217 #if 0 3218 if ((error = scope6_check_id(sa6, ip6_use_defzone)) 3219 != 0) { 3220 return (error); 3221 } 3222 #endif 3223 sa6->sin6_scope_id = 0; /* XXX */ 3224 break; 3225 } 3226 case AF_LINK: /* should eventually be supported */ 3227 default: 3228 return (EAFNOSUPPORT); 3229 } 3230 3231 /* turn off the previous option, then set the new option. */ 3232 ip6_clearpktopts(opt, IPV6_NEXTHOP); 3233 if (sticky) { 3234 opt->ip6po_nexthop = malloc(*buf, M_IP6OPT, M_WAITOK); 3235 bcopy(buf, opt->ip6po_nexthop, *buf); 3236 } else 3237 opt->ip6po_nexthop = (struct sockaddr *)buf; 3238 break; 3239 3240 case IPV6_2292HOPOPTS: 3241 case IPV6_HOPOPTS: 3242 { 3243 struct ip6_hbh *hbh; 3244 int hbhlen; 3245 3246 /* 3247 * XXX: We don't allow a non-privileged user to set ANY HbH 3248 * options, since per-option restriction has too much 3249 * overhead. 3250 */ 3251 if (!priv) 3252 return (EPERM); 3253 3254 if (len == 0) { 3255 ip6_clearpktopts(opt, IPV6_HOPOPTS); 3256 break; /* just remove the option */ 3257 } 3258 3259 /* message length validation */ 3260 if (len < sizeof(struct ip6_hbh)) 3261 return (EINVAL); 3262 hbh = (struct ip6_hbh *)buf; 3263 hbhlen = (hbh->ip6h_len + 1) << 3; 3264 if (len != hbhlen) 3265 return (EINVAL); 3266 3267 /* turn off the previous option, then set the new option. */ 3268 ip6_clearpktopts(opt, IPV6_HOPOPTS); 3269 if (sticky) { 3270 opt->ip6po_hbh = malloc(hbhlen, M_IP6OPT, M_WAITOK); 3271 bcopy(hbh, opt->ip6po_hbh, hbhlen); 3272 } else 3273 opt->ip6po_hbh = hbh; 3274 3275 break; 3276 } 3277 3278 case IPV6_2292DSTOPTS: 3279 case IPV6_DSTOPTS: 3280 case IPV6_RTHDRDSTOPTS: 3281 { 3282 struct ip6_dest *dest, **newdest = NULL; 3283 int destlen; 3284 3285 if (!priv) /* XXX: see the comment for IPV6_HOPOPTS */ 3286 return (EPERM); 3287 3288 if (len == 0) { 3289 ip6_clearpktopts(opt, optname); 3290 break; /* just remove the option */ 3291 } 3292 3293 /* message length validation */ 3294 if (len < sizeof(struct ip6_dest)) 3295 return (EINVAL); 3296 dest = (struct ip6_dest *)buf; 3297 destlen = (dest->ip6d_len + 1) << 3; 3298 if (len != destlen) 3299 return (EINVAL); 3300 3301 /* 3302 * Determine the position that the destination options header 3303 * should be inserted; before or after the routing header. 3304 */ 3305 switch (optname) { 3306 case IPV6_2292DSTOPTS: 3307 /* 3308 * The old advacned API is ambiguous on this point. 3309 * Our approach is to determine the position based 3310 * according to the existence of a routing header. 3311 * Note, however, that this depends on the order of the 3312 * extension headers in the ancillary data; the 1st 3313 * part of the destination options header must appear 3314 * before the routing header in the ancillary data, 3315 * too. 3316 * RFC3542 solved the ambiguity by introducing 3317 * separate ancillary data or option types. 3318 */ 3319 if (opt->ip6po_rthdr == NULL) 3320 newdest = &opt->ip6po_dest1; 3321 else 3322 newdest = &opt->ip6po_dest2; 3323 break; 3324 case IPV6_RTHDRDSTOPTS: 3325 newdest = &opt->ip6po_dest1; 3326 break; 3327 case IPV6_DSTOPTS: 3328 newdest = &opt->ip6po_dest2; 3329 break; 3330 } 3331 3332 /* turn off the previous option, then set the new option. */ 3333 ip6_clearpktopts(opt, optname); 3334 if (sticky) { 3335 *newdest = malloc(destlen, M_IP6OPT, M_WAITOK); 3336 bcopy(dest, *newdest, destlen); 3337 } else 3338 *newdest = dest; 3339 3340 break; 3341 } 3342 3343 case IPV6_2292RTHDR: 3344 case IPV6_RTHDR: 3345 { 3346 struct ip6_rthdr *rth; 3347 int rthlen; 3348 3349 if (len == 0) { 3350 ip6_clearpktopts(opt, IPV6_RTHDR); 3351 break; /* just remove the option */ 3352 } 3353 3354 /* message length validation */ 3355 if (len < sizeof(struct ip6_rthdr)) 3356 return (EINVAL); 3357 rth = (struct ip6_rthdr *)buf; 3358 rthlen = (rth->ip6r_len + 1) << 3; 3359 if (len != rthlen) 3360 return (EINVAL); 3361 3362 switch (rth->ip6r_type) { 3363 case IPV6_RTHDR_TYPE_0: 3364 if (rth->ip6r_len == 0) /* must contain one addr */ 3365 return (EINVAL); 3366 if (rth->ip6r_len % 2) /* length must be even */ 3367 return (EINVAL); 3368 if (rth->ip6r_len / 2 != rth->ip6r_segleft) 3369 return (EINVAL); 3370 break; 3371 default: 3372 return (EINVAL); /* not supported */ 3373 } 3374 3375 /* turn off the previous option */ 3376 ip6_clearpktopts(opt, IPV6_RTHDR); 3377 if (sticky) { 3378 opt->ip6po_rthdr = malloc(rthlen, M_IP6OPT, M_WAITOK); 3379 bcopy(rth, opt->ip6po_rthdr, rthlen); 3380 } else 3381 opt->ip6po_rthdr = rth; 3382 3383 break; 3384 } 3385 3386 case IPV6_USE_MIN_MTU: 3387 if (len != sizeof(int)) 3388 return (EINVAL); 3389 minmtupolicy = *(int *)buf; 3390 if (minmtupolicy != IP6PO_MINMTU_MCASTONLY && 3391 minmtupolicy != IP6PO_MINMTU_DISABLE && 3392 minmtupolicy != IP6PO_MINMTU_ALL) { 3393 return (EINVAL); 3394 } 3395 opt->ip6po_minmtu = minmtupolicy; 3396 break; 3397 3398 case IPV6_DONTFRAG: 3399 if (len != sizeof(int)) 3400 return (EINVAL); 3401 3402 if (uproto == IPPROTO_TCP || *(int *)buf == 0) { 3403 /* 3404 * we ignore this option for TCP sockets. 3405 * (RFC3542 leaves this case unspecified.) 3406 */ 3407 opt->ip6po_flags &= ~IP6PO_DONTFRAG; 3408 } else 3409 opt->ip6po_flags |= IP6PO_DONTFRAG; 3410 break; 3411 3412 case IPV6_PREFER_TEMPADDR: 3413 if (len != sizeof(int)) 3414 return (EINVAL); 3415 preftemp = *(int *)buf; 3416 if (preftemp != IP6PO_TEMPADDR_SYSTEM && 3417 preftemp != IP6PO_TEMPADDR_NOTPREFER && 3418 preftemp != IP6PO_TEMPADDR_PREFER) { 3419 return (EINVAL); 3420 } 3421 opt->ip6po_prefer_tempaddr = preftemp; 3422 break; 3423 3424 default: 3425 return (ENOPROTOOPT); 3426 } /* end of switch */ 3427 3428 return (0); 3429 } 3430 3431 /* 3432 * Routine called from ip6_output() to loop back a copy of an IP6 multicast 3433 * packet to the input queue of a specified interface. Note that this 3434 * calls the output routine of the loopback "driver", but with an interface 3435 * pointer that might NOT be &loif -- easier than replicating that code here. 3436 */ 3437 void 3438 ip6_mloopback(ifp, m, dst) 3439 struct ifnet *ifp; 3440 struct mbuf *m; 3441 struct sockaddr_in6 *dst; 3442 { 3443 struct mbuf *copym; 3444 struct ip6_hdr *ip6; 3445 3446 copym = m_copy(m, 0, M_COPYALL); 3447 if (copym == NULL) 3448 return; 3449 3450 /* 3451 * Make sure to deep-copy IPv6 header portion in case the data 3452 * is in an mbuf cluster, so that we can safely override the IPv6 3453 * header portion later. 3454 */ 3455 if ((copym->m_flags & M_EXT) != 0 || 3456 copym->m_len < sizeof(struct ip6_hdr)) { 3457 copym = m_pullup(copym, sizeof(struct ip6_hdr)); 3458 if (copym == NULL) 3459 return; 3460 } 3461 3462 #ifdef DIAGNOSTIC 3463 if (copym->m_len < sizeof(*ip6)) { 3464 m_freem(copym); 3465 return; 3466 } 3467 #endif 3468 3469 ip6 = mtod(copym, struct ip6_hdr *); 3470 /* 3471 * clear embedded scope identifiers if necessary. 3472 * in6_clearscope will touch the addresses only when necessary. 3473 */ 3474 in6_clearscope(&ip6->ip6_src); 3475 in6_clearscope(&ip6->ip6_dst); 3476 3477 (void)if_simloop(ifp, copym, dst->sin6_family, 0); 3478 } 3479 3480 /* 3481 * Chop IPv6 header off from the payload. 3482 */ 3483 static int 3484 ip6_splithdr(m, exthdrs) 3485 struct mbuf *m; 3486 struct ip6_exthdrs *exthdrs; 3487 { 3488 struct mbuf *mh; 3489 struct ip6_hdr *ip6; 3490 3491 ip6 = mtod(m, struct ip6_hdr *); 3492 if (m->m_len > sizeof(*ip6)) { 3493 MGETHDR(mh, M_DONTWAIT, MT_HEADER); 3494 if (mh == 0) { 3495 m_freem(m); 3496 return ENOBUFS; 3497 } 3498 M_MOVE_PKTHDR(mh, m); 3499 MH_ALIGN(mh, sizeof(*ip6)); 3500 m->m_len -= sizeof(*ip6); 3501 m->m_data += sizeof(*ip6); 3502 mh->m_next = m; 3503 m = mh; 3504 m->m_len = sizeof(*ip6); 3505 bcopy((caddr_t)ip6, mtod(m, caddr_t), sizeof(*ip6)); 3506 } 3507 exthdrs->ip6e_ip6 = m; 3508 return 0; 3509 } 3510 3511 /* 3512 * Compute IPv6 extension header length. 3513 */ 3514 int 3515 ip6_optlen(in6p) 3516 struct in6pcb *in6p; 3517 { 3518 int len; 3519 3520 if (!in6p->in6p_outputopts) 3521 return 0; 3522 3523 len = 0; 3524 #define elen(x) \ 3525 (((struct ip6_ext *)(x)) ? (((struct ip6_ext *)(x))->ip6e_len + 1) << 3 : 0) 3526 3527 len += elen(in6p->in6p_outputopts->ip6po_hbh); 3528 if (in6p->in6p_outputopts->ip6po_rthdr) 3529 /* dest1 is valid with rthdr only */ 3530 len += elen(in6p->in6p_outputopts->ip6po_dest1); 3531 len += elen(in6p->in6p_outputopts->ip6po_rthdr); 3532 len += elen(in6p->in6p_outputopts->ip6po_dest2); 3533 return len; 3534 #undef elen 3535 }
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