ip6_output.c revision 1.100
1 /* $NetBSD: ip6_output.c,v 1.100 2006/07/12 13:11:27 tron Exp $ */ 2 /* $KAME: ip6_output.c,v 1.172 2001/03/25 09:55:56 itojun Exp $ */ 3 4 /* 5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the project nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 /* 34 * Copyright (c) 1982, 1986, 1988, 1990, 1993 35 * The Regents of the University of California. All rights reserved. 36 * 37 * Redistribution and use in source and binary forms, with or without 38 * modification, are permitted provided that the following conditions 39 * are met: 40 * 1. Redistributions of source code must retain the above copyright 41 * notice, this list of conditions and the following disclaimer. 42 * 2. Redistributions in binary form must reproduce the above copyright 43 * notice, this list of conditions and the following disclaimer in the 44 * documentation and/or other materials provided with the distribution. 45 * 3. 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 <sys/cdefs.h> 65 __KERNEL_RCSID(0, "$NetBSD: ip6_output.c,v 1.100 2006/07/12 13:11:27 tron Exp $"); 66 67 #include "opt_inet.h" 68 #include "opt_inet6.h" 69 #include "opt_ipsec.h" 70 #include "opt_pfil_hooks.h" 71 72 #include <sys/param.h> 73 #include <sys/malloc.h> 74 #include <sys/mbuf.h> 75 #include <sys/errno.h> 76 #include <sys/protosw.h> 77 #include <sys/socket.h> 78 #include <sys/socketvar.h> 79 #include <sys/systm.h> 80 #include <sys/proc.h> 81 #include <sys/kauth.h> 82 83 #include <net/if.h> 84 #include <net/route.h> 85 #ifdef PFIL_HOOKS 86 #include <net/pfil.h> 87 #endif 88 89 #include <netinet/in.h> 90 #include <netinet/in_var.h> 91 #include <netinet/ip6.h> 92 #include <netinet/icmp6.h> 93 #include <netinet/in_offload.h> 94 #include <netinet6/ip6_var.h> 95 #include <netinet6/in6_pcb.h> 96 #include <netinet6/nd6.h> 97 #include <netinet6/ip6protosw.h> 98 #include <netinet6/scope6_var.h> 99 100 #ifdef IPSEC 101 #include <netinet6/ipsec.h> 102 #include <netkey/key.h> 103 #endif /* IPSEC */ 104 105 #include <net/net_osdep.h> 106 107 #ifdef PFIL_HOOKS 108 extern struct pfil_head inet6_pfil_hook; /* XXX */ 109 #endif 110 111 struct ip6_exthdrs { 112 struct mbuf *ip6e_ip6; 113 struct mbuf *ip6e_hbh; 114 struct mbuf *ip6e_dest1; 115 struct mbuf *ip6e_rthdr; 116 struct mbuf *ip6e_dest2; 117 }; 118 119 static int ip6_pcbopt __P((int, u_char *, int, struct ip6_pktopts **, 120 int, int)); 121 static int ip6_getpcbopt __P((struct ip6_pktopts *, int, struct mbuf **)); 122 static int ip6_setpktopt __P((int, u_char *, int, struct ip6_pktopts *, int, 123 int, int, int)); 124 static int ip6_setmoptions __P((int, struct ip6_moptions **, struct mbuf *)); 125 static int ip6_getmoptions __P((int, struct ip6_moptions *, struct mbuf **)); 126 static int ip6_copyexthdr __P((struct mbuf **, caddr_t, int)); 127 static int ip6_insertfraghdr __P((struct mbuf *, struct mbuf *, int, 128 struct ip6_frag **)); 129 static int ip6_insert_jumboopt __P((struct ip6_exthdrs *, u_int32_t)); 130 static int ip6_splithdr __P((struct mbuf *, struct ip6_exthdrs *)); 131 static int ip6_getpmtu __P((struct route_in6 *, struct route_in6 *, 132 struct ifnet *, struct in6_addr *, u_long *, int *)); 133 static int copypktopts __P((struct ip6_pktopts *, struct ip6_pktopts *, int)); 134 135 #ifdef RFC2292 136 static int ip6_pcbopts __P((struct ip6_pktopts **, struct mbuf *, 137 struct socket *)); 138 #endif 139 140 #define IN6_NEED_CHECKSUM(ifp, csum_flags) \ 141 (__predict_true(((ifp)->if_flags & IFF_LOOPBACK) == 0 || \ 142 (((csum_flags) & M_CSUM_UDPv6) != 0 && udp_do_loopback_cksum) || \ 143 (((csum_flags) & M_CSUM_TCPv6) != 0 && tcp_do_loopback_cksum))) 144 145 /* 146 * IP6 output. The packet in mbuf chain m contains a skeletal IP6 147 * header (with pri, len, nxt, hlim, src, dst). 148 * This function may modify ver and hlim only. 149 * The mbuf chain containing the packet will be freed. 150 * The mbuf opt, if present, will not be freed. 151 * 152 * type of "mtu": rt_rmx.rmx_mtu is u_long, ifnet.ifr_mtu is int, and 153 * nd_ifinfo.linkmtu is u_int32_t. so we use u_long to hold largest one, 154 * which is rt_rmx.rmx_mtu. 155 */ 156 int 157 ip6_output(m0, opt, ro, flags, im6o, so, ifpp) 158 struct mbuf *m0; 159 struct ip6_pktopts *opt; 160 struct route_in6 *ro; 161 int flags; 162 struct ip6_moptions *im6o; 163 struct socket *so; 164 struct ifnet **ifpp; /* XXX: just for statistics */ 165 { 166 struct ip6_hdr *ip6, *mhip6; 167 struct ifnet *ifp, *origifp; 168 struct mbuf *m = m0; 169 int hlen, tlen, len, off; 170 struct route_in6 ip6route; 171 struct rtentry *rt = NULL; 172 struct sockaddr_in6 *dst, src_sa, dst_sa; 173 int error = 0; 174 struct in6_ifaddr *ia = NULL; 175 u_long mtu; 176 int alwaysfrag, dontfrag; 177 u_int32_t optlen = 0, plen = 0, unfragpartlen = 0; 178 struct ip6_exthdrs exthdrs; 179 struct in6_addr finaldst, src0, dst0; 180 u_int32_t zone; 181 struct route_in6 *ro_pmtu = NULL; 182 int hdrsplit = 0; 183 int needipsec = 0; 184 #ifdef IPSEC 185 int needipsectun = 0; 186 struct secpolicy *sp = NULL; 187 188 ip6 = mtod(m, struct ip6_hdr *); 189 #endif /* IPSEC */ 190 191 #ifdef DIAGNOSTIC 192 if ((m->m_flags & M_PKTHDR) == 0) 193 panic("ip6_output: no HDR"); 194 195 if ((m->m_pkthdr.csum_flags & 196 (M_CSUM_TCPv4|M_CSUM_UDPv4|M_CSUM_TSOv4)) != 0) { 197 panic("ip6_output: IPv4 checksum offload flags: %d", 198 m->m_pkthdr.csum_flags); 199 } 200 201 if ((m->m_pkthdr.csum_flags & (M_CSUM_TCPv6|M_CSUM_UDPv6)) == 202 (M_CSUM_TCPv6|M_CSUM_UDPv6)) { 203 panic("ip6_output: conflicting checksum offload flags: %d", 204 m->m_pkthdr.csum_flags); 205 } 206 #endif 207 208 M_CSUM_DATA_IPv6_HL_SET(m->m_pkthdr.csum_data, sizeof(struct ip6_hdr)); 209 210 #define MAKE_EXTHDR(hp, mp) \ 211 do { \ 212 if (hp) { \ 213 struct ip6_ext *eh = (struct ip6_ext *)(hp); \ 214 error = ip6_copyexthdr((mp), (caddr_t)(hp), \ 215 ((eh)->ip6e_len + 1) << 3); \ 216 if (error) \ 217 goto freehdrs; \ 218 } \ 219 } while (/*CONSTCOND*/ 0) 220 221 bzero(&exthdrs, sizeof(exthdrs)); 222 if (opt) { 223 /* Hop-by-Hop options header */ 224 MAKE_EXTHDR(opt->ip6po_hbh, &exthdrs.ip6e_hbh); 225 /* Destination options header(1st part) */ 226 MAKE_EXTHDR(opt->ip6po_dest1, &exthdrs.ip6e_dest1); 227 /* Routing header */ 228 MAKE_EXTHDR(opt->ip6po_rthdr, &exthdrs.ip6e_rthdr); 229 /* Destination options header(2nd part) */ 230 MAKE_EXTHDR(opt->ip6po_dest2, &exthdrs.ip6e_dest2); 231 } 232 233 #ifdef IPSEC 234 if ((flags & IPV6_FORWARDING) != 0) { 235 needipsec = 0; 236 goto skippolicycheck; 237 } 238 239 /* get a security policy for this packet */ 240 if (so == NULL) 241 sp = ipsec6_getpolicybyaddr(m, IPSEC_DIR_OUTBOUND, 0, &error); 242 else { 243 if (IPSEC_PCB_SKIP_IPSEC(sotoinpcb_hdr(so)->inph_sp, 244 IPSEC_DIR_OUTBOUND)) { 245 needipsec = 0; 246 goto skippolicycheck; 247 } 248 sp = ipsec6_getpolicybysock(m, IPSEC_DIR_OUTBOUND, so, &error); 249 } 250 251 if (sp == NULL) { 252 ipsec6stat.out_inval++; 253 goto freehdrs; 254 } 255 256 error = 0; 257 258 /* check policy */ 259 switch (sp->policy) { 260 case IPSEC_POLICY_DISCARD: 261 /* 262 * This packet is just discarded. 263 */ 264 ipsec6stat.out_polvio++; 265 goto freehdrs; 266 267 case IPSEC_POLICY_BYPASS: 268 case IPSEC_POLICY_NONE: 269 /* no need to do IPsec. */ 270 needipsec = 0; 271 break; 272 273 case IPSEC_POLICY_IPSEC: 274 if (sp->req == NULL) { 275 /* XXX should be panic ? */ 276 printf("ip6_output: No IPsec request specified.\n"); 277 error = EINVAL; 278 goto freehdrs; 279 } 280 needipsec = 1; 281 break; 282 283 case IPSEC_POLICY_ENTRUST: 284 default: 285 printf("ip6_output: Invalid policy found. %d\n", sp->policy); 286 } 287 288 skippolicycheck:; 289 #endif /* IPSEC */ 290 291 if (needipsec && 292 (m->m_pkthdr.csum_flags & (M_CSUM_UDPv6|M_CSUM_TCPv6)) != 0) { 293 in6_delayed_cksum(m); 294 m->m_pkthdr.csum_flags &= ~(M_CSUM_UDPv6|M_CSUM_TCPv6); 295 } 296 297 /* 298 * Calculate the total length of the extension header chain. 299 * Keep the length of the unfragmentable part for fragmentation. 300 */ 301 optlen = 0; 302 if (exthdrs.ip6e_hbh) optlen += exthdrs.ip6e_hbh->m_len; 303 if (exthdrs.ip6e_dest1) optlen += exthdrs.ip6e_dest1->m_len; 304 if (exthdrs.ip6e_rthdr) optlen += exthdrs.ip6e_rthdr->m_len; 305 unfragpartlen = optlen + sizeof(struct ip6_hdr); 306 /* NOTE: we don't add AH/ESP length here. do that later. */ 307 if (exthdrs.ip6e_dest2) optlen += exthdrs.ip6e_dest2->m_len; 308 309 /* 310 * If we need IPsec, or there is at least one extension header, 311 * separate IP6 header from the payload. 312 */ 313 if ((needipsec || optlen) && !hdrsplit) { 314 if ((error = ip6_splithdr(m, &exthdrs)) != 0) { 315 m = NULL; 316 goto freehdrs; 317 } 318 m = exthdrs.ip6e_ip6; 319 hdrsplit++; 320 } 321 322 /* adjust pointer */ 323 ip6 = mtod(m, struct ip6_hdr *); 324 325 /* adjust mbuf packet header length */ 326 m->m_pkthdr.len += optlen; 327 plen = m->m_pkthdr.len - sizeof(*ip6); 328 329 /* If this is a jumbo payload, insert a jumbo payload option. */ 330 if (plen > IPV6_MAXPACKET) { 331 if (!hdrsplit) { 332 if ((error = ip6_splithdr(m, &exthdrs)) != 0) { 333 m = NULL; 334 goto freehdrs; 335 } 336 m = exthdrs.ip6e_ip6; 337 hdrsplit++; 338 } 339 /* adjust pointer */ 340 ip6 = mtod(m, struct ip6_hdr *); 341 if ((error = ip6_insert_jumboopt(&exthdrs, plen)) != 0) 342 goto freehdrs; 343 optlen += 8; /* XXX JUMBOOPTLEN */ 344 ip6->ip6_plen = 0; 345 } else 346 ip6->ip6_plen = htons(plen); 347 348 /* 349 * Concatenate headers and fill in next header fields. 350 * Here we have, on "m" 351 * IPv6 payload 352 * and we insert headers accordingly. Finally, we should be getting: 353 * IPv6 hbh dest1 rthdr ah* [esp* dest2 payload] 354 * 355 * during the header composing process, "m" points to IPv6 header. 356 * "mprev" points to an extension header prior to esp. 357 */ 358 { 359 u_char *nexthdrp = &ip6->ip6_nxt; 360 struct mbuf *mprev = m; 361 362 /* 363 * we treat dest2 specially. this makes IPsec processing 364 * much easier. the goal here is to make mprev point the 365 * mbuf prior to dest2. 366 * 367 * result: IPv6 dest2 payload 368 * m and mprev will point to IPv6 header. 369 */ 370 if (exthdrs.ip6e_dest2) { 371 if (!hdrsplit) 372 panic("assumption failed: hdr not split"); 373 exthdrs.ip6e_dest2->m_next = m->m_next; 374 m->m_next = exthdrs.ip6e_dest2; 375 *mtod(exthdrs.ip6e_dest2, u_char *) = ip6->ip6_nxt; 376 ip6->ip6_nxt = IPPROTO_DSTOPTS; 377 } 378 379 #define MAKE_CHAIN(m, mp, p, i)\ 380 do {\ 381 if (m) {\ 382 if (!hdrsplit) \ 383 panic("assumption failed: hdr not split"); \ 384 *mtod((m), u_char *) = *(p);\ 385 *(p) = (i);\ 386 p = mtod((m), u_char *);\ 387 (m)->m_next = (mp)->m_next;\ 388 (mp)->m_next = (m);\ 389 (mp) = (m);\ 390 }\ 391 } while (/*CONSTCOND*/ 0) 392 /* 393 * result: IPv6 hbh dest1 rthdr dest2 payload 394 * m will point to IPv6 header. mprev will point to the 395 * extension header prior to dest2 (rthdr in the above case). 396 */ 397 MAKE_CHAIN(exthdrs.ip6e_hbh, mprev, nexthdrp, IPPROTO_HOPOPTS); 398 MAKE_CHAIN(exthdrs.ip6e_dest1, mprev, nexthdrp, 399 IPPROTO_DSTOPTS); 400 MAKE_CHAIN(exthdrs.ip6e_rthdr, mprev, nexthdrp, 401 IPPROTO_ROUTING); 402 403 M_CSUM_DATA_IPv6_HL_SET(m->m_pkthdr.csum_data, 404 sizeof(struct ip6_hdr) + optlen); 405 406 #ifdef IPSEC 407 if (!needipsec) 408 goto skip_ipsec2; 409 410 /* 411 * pointers after IPsec headers are not valid any more. 412 * other pointers need a great care too. 413 * (IPsec routines should not mangle mbufs prior to AH/ESP) 414 */ 415 exthdrs.ip6e_dest2 = NULL; 416 417 { 418 struct ip6_rthdr *rh = NULL; 419 int segleft_org = 0; 420 struct ipsec_output_state state; 421 422 if (exthdrs.ip6e_rthdr) { 423 rh = mtod(exthdrs.ip6e_rthdr, struct ip6_rthdr *); 424 segleft_org = rh->ip6r_segleft; 425 rh->ip6r_segleft = 0; 426 } 427 428 bzero(&state, sizeof(state)); 429 state.m = m; 430 error = ipsec6_output_trans(&state, nexthdrp, mprev, sp, flags, 431 &needipsectun); 432 m = state.m; 433 if (error) { 434 /* mbuf is already reclaimed in ipsec6_output_trans. */ 435 m = NULL; 436 switch (error) { 437 case EHOSTUNREACH: 438 case ENETUNREACH: 439 case EMSGSIZE: 440 case ENOBUFS: 441 case ENOMEM: 442 break; 443 default: 444 printf("ip6_output (ipsec): error code %d\n", error); 445 /* FALLTHROUGH */ 446 case ENOENT: 447 /* don't show these error codes to the user */ 448 error = 0; 449 break; 450 } 451 goto bad; 452 } 453 if (exthdrs.ip6e_rthdr) { 454 /* ah6_output doesn't modify mbuf chain */ 455 rh->ip6r_segleft = segleft_org; 456 } 457 } 458 skip_ipsec2:; 459 #endif 460 } 461 462 /* 463 * If there is a routing header, replace destination address field 464 * with the first hop of the routing header. 465 */ 466 if (exthdrs.ip6e_rthdr) { 467 struct ip6_rthdr *rh; 468 struct ip6_rthdr0 *rh0; 469 struct in6_addr *addr; 470 struct sockaddr_in6 sa; 471 472 rh = (struct ip6_rthdr *)(mtod(exthdrs.ip6e_rthdr, 473 struct ip6_rthdr *)); 474 finaldst = ip6->ip6_dst; 475 switch (rh->ip6r_type) { 476 case IPV6_RTHDR_TYPE_0: 477 rh0 = (struct ip6_rthdr0 *)rh; 478 addr = (struct in6_addr *)(rh0 + 1); 479 480 /* 481 * construct a sockaddr_in6 form of 482 * the first hop. 483 * 484 * XXX: we may not have enough 485 * information about its scope zone; 486 * there is no standard API to pass 487 * the information from the 488 * application. 489 */ 490 bzero(&sa, sizeof(sa)); 491 sa.sin6_family = AF_INET6; 492 sa.sin6_len = sizeof(sa); 493 sa.sin6_addr = addr[0]; 494 if ((error = sa6_embedscope(&sa, 495 ip6_use_defzone)) != 0) { 496 goto bad; 497 } 498 ip6->ip6_dst = sa.sin6_addr; 499 (void)memmove(&addr[0], &addr[1], 500 sizeof(struct in6_addr) * 501 (rh0->ip6r0_segleft - 1)); 502 addr[rh0->ip6r0_segleft - 1] = finaldst; 503 /* XXX */ 504 in6_clearscope(addr + rh0->ip6r0_segleft - 1); 505 break; 506 default: /* is it possible? */ 507 error = EINVAL; 508 goto bad; 509 } 510 } 511 512 /* Source address validation */ 513 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) && 514 (flags & IPV6_UNSPECSRC) == 0) { 515 error = EOPNOTSUPP; 516 ip6stat.ip6s_badscope++; 517 goto bad; 518 } 519 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src)) { 520 error = EOPNOTSUPP; 521 ip6stat.ip6s_badscope++; 522 goto bad; 523 } 524 525 ip6stat.ip6s_localout++; 526 527 /* 528 * Route packet. 529 */ 530 /* initialize cached route */ 531 if (ro == 0) { 532 ro = &ip6route; 533 bzero((caddr_t)ro, sizeof(*ro)); 534 } 535 ro_pmtu = ro; 536 if (opt && opt->ip6po_rthdr) 537 ro = &opt->ip6po_route; 538 dst = (struct sockaddr_in6 *)&ro->ro_dst; 539 540 /* 541 * if specified, try to fill in the traffic class field. 542 * do not override if a non-zero value is already set. 543 * we check the diffserv field and the ecn field separately. 544 */ 545 if (opt && opt->ip6po_tclass >= 0) { 546 int mask = 0; 547 548 if ((ip6->ip6_flow & htonl(0xfc << 20)) == 0) 549 mask |= 0xfc; 550 if ((ip6->ip6_flow & htonl(0x03 << 20)) == 0) 551 mask |= 0x03; 552 if (mask != 0) 553 ip6->ip6_flow |= htonl((opt->ip6po_tclass & mask) << 20); 554 } 555 556 /* fill in or override the hop limit field, if necessary. */ 557 if (opt && opt->ip6po_hlim != -1) 558 ip6->ip6_hlim = opt->ip6po_hlim & 0xff; 559 else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 560 if (im6o != NULL) 561 ip6->ip6_hlim = im6o->im6o_multicast_hlim; 562 else 563 ip6->ip6_hlim = ip6_defmcasthlim; 564 } 565 566 #ifdef IPSEC 567 if (needipsec && needipsectun) { 568 struct ipsec_output_state state; 569 570 /* 571 * All the extension headers will become inaccessible 572 * (since they can be encrypted). 573 * Don't panic, we need no more updates to extension headers 574 * on inner IPv6 packet (since they are now encapsulated). 575 * 576 * IPv6 [ESP|AH] IPv6 [extension headers] payload 577 */ 578 bzero(&exthdrs, sizeof(exthdrs)); 579 exthdrs.ip6e_ip6 = m; 580 581 bzero(&state, sizeof(state)); 582 state.m = m; 583 state.ro = (struct route *)ro; 584 state.dst = (struct sockaddr *)dst; 585 586 error = ipsec6_output_tunnel(&state, sp, flags); 587 588 m = state.m; 589 ro_pmtu = ro = (struct route_in6 *)state.ro; 590 dst = (struct sockaddr_in6 *)state.dst; 591 if (error) { 592 /* mbuf is already reclaimed in ipsec6_output_tunnel. */ 593 m0 = m = NULL; 594 m = NULL; 595 switch (error) { 596 case EHOSTUNREACH: 597 case ENETUNREACH: 598 case EMSGSIZE: 599 case ENOBUFS: 600 case ENOMEM: 601 break; 602 default: 603 printf("ip6_output (ipsec): error code %d\n", error); 604 /* FALLTHROUGH */ 605 case ENOENT: 606 /* don't show these error codes to the user */ 607 error = 0; 608 break; 609 } 610 goto bad; 611 } 612 613 exthdrs.ip6e_ip6 = m; 614 } 615 #endif /* IPSEC */ 616 617 /* adjust pointer */ 618 ip6 = mtod(m, struct ip6_hdr *); 619 620 bzero(&dst_sa, sizeof(dst_sa)); 621 dst_sa.sin6_family = AF_INET6; 622 dst_sa.sin6_len = sizeof(dst_sa); 623 dst_sa.sin6_addr = ip6->ip6_dst; 624 if ((error = in6_selectroute(&dst_sa, opt, im6o, ro, &ifp, &rt, 0)) 625 != 0) { 626 switch (error) { 627 case EHOSTUNREACH: 628 ip6stat.ip6s_noroute++; 629 break; 630 case EADDRNOTAVAIL: 631 default: 632 break; /* XXX statistics? */ 633 } 634 if (ifp != NULL) 635 in6_ifstat_inc(ifp, ifs6_out_discard); 636 goto bad; 637 } 638 if (rt == NULL) { 639 /* 640 * If in6_selectroute() does not return a route entry, 641 * dst may not have been updated. 642 */ 643 *dst = dst_sa; /* XXX */ 644 } 645 646 /* 647 * then rt (for unicast) and ifp must be non-NULL valid values. 648 */ 649 if ((flags & IPV6_FORWARDING) == 0) { 650 /* XXX: the FORWARDING flag can be set for mrouting. */ 651 in6_ifstat_inc(ifp, ifs6_out_request); 652 } 653 if (rt != NULL) { 654 ia = (struct in6_ifaddr *)(rt->rt_ifa); 655 rt->rt_use++; 656 } 657 658 /* 659 * The outgoing interface must be in the zone of source and 660 * destination addresses. We should use ia_ifp to support the 661 * case of sending packets to an address of our own. 662 */ 663 if (ia != NULL && ia->ia_ifp) 664 origifp = ia->ia_ifp; 665 else 666 origifp = ifp; 667 668 src0 = ip6->ip6_src; 669 if (in6_setscope(&src0, origifp, &zone)) 670 goto badscope; 671 bzero(&src_sa, sizeof(src_sa)); 672 src_sa.sin6_family = AF_INET6; 673 src_sa.sin6_len = sizeof(src_sa); 674 src_sa.sin6_addr = ip6->ip6_src; 675 if (sa6_recoverscope(&src_sa) || zone != src_sa.sin6_scope_id) 676 goto badscope; 677 678 dst0 = ip6->ip6_dst; 679 if (in6_setscope(&dst0, origifp, &zone)) 680 goto badscope; 681 /* re-initialize to be sure */ 682 bzero(&dst_sa, sizeof(dst_sa)); 683 dst_sa.sin6_family = AF_INET6; 684 dst_sa.sin6_len = sizeof(dst_sa); 685 dst_sa.sin6_addr = ip6->ip6_dst; 686 if (sa6_recoverscope(&dst_sa) || zone != dst_sa.sin6_scope_id) 687 goto badscope; 688 689 /* scope check is done. */ 690 goto routefound; 691 692 badscope: 693 ip6stat.ip6s_badscope++; 694 in6_ifstat_inc(origifp, ifs6_out_discard); 695 if (error == 0) 696 error = EHOSTUNREACH; /* XXX */ 697 goto bad; 698 699 routefound: 700 if (rt && !IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 701 if (opt && opt->ip6po_nextroute.ro_rt) { 702 /* 703 * The nexthop is explicitly specified by the 704 * application. We assume the next hop is an IPv6 705 * address. 706 */ 707 dst = (struct sockaddr_in6 *)opt->ip6po_nexthop; 708 } else if ((rt->rt_flags & RTF_GATEWAY)) 709 dst = (struct sockaddr_in6 *)rt->rt_gateway; 710 } 711 712 /* 713 * XXXXXX: original code follows: 714 */ 715 if (!IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) 716 m->m_flags &= ~(M_BCAST | M_MCAST); /* just in case */ 717 else { 718 struct in6_multi *in6m; 719 720 m->m_flags = (m->m_flags & ~M_BCAST) | M_MCAST; 721 722 in6_ifstat_inc(ifp, ifs6_out_mcast); 723 724 /* 725 * Confirm that the outgoing interface supports multicast. 726 */ 727 if (!(ifp->if_flags & IFF_MULTICAST)) { 728 ip6stat.ip6s_noroute++; 729 in6_ifstat_inc(ifp, ifs6_out_discard); 730 error = ENETUNREACH; 731 goto bad; 732 } 733 734 IN6_LOOKUP_MULTI(ip6->ip6_dst, ifp, in6m); 735 if (in6m != NULL && 736 (im6o == NULL || im6o->im6o_multicast_loop)) { 737 /* 738 * If we belong to the destination multicast group 739 * on the outgoing interface, and the caller did not 740 * forbid loopback, loop back a copy. 741 */ 742 ip6_mloopback(ifp, m, dst); 743 } else { 744 /* 745 * If we are acting as a multicast router, perform 746 * multicast forwarding as if the packet had just 747 * arrived on the interface to which we are about 748 * to send. The multicast forwarding function 749 * recursively calls this function, using the 750 * IPV6_FORWARDING flag to prevent infinite recursion. 751 * 752 * Multicasts that are looped back by ip6_mloopback(), 753 * above, will be forwarded by the ip6_input() routine, 754 * if necessary. 755 */ 756 if (ip6_mrouter && (flags & IPV6_FORWARDING) == 0) { 757 if (ip6_mforward(ip6, ifp, m) != 0) { 758 m_freem(m); 759 goto done; 760 } 761 } 762 } 763 /* 764 * Multicasts with a hoplimit of zero may be looped back, 765 * above, but must not be transmitted on a network. 766 * Also, multicasts addressed to the loopback interface 767 * are not sent -- the above call to ip6_mloopback() will 768 * loop back a copy if this host actually belongs to the 769 * destination group on the loopback interface. 770 */ 771 if (ip6->ip6_hlim == 0 || (ifp->if_flags & IFF_LOOPBACK) || 772 IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst)) { 773 m_freem(m); 774 goto done; 775 } 776 } 777 778 /* 779 * Fill the outgoing inteface to tell the upper layer 780 * to increment per-interface statistics. 781 */ 782 if (ifpp) 783 *ifpp = ifp; 784 785 /* Determine path MTU. */ 786 if ((error = ip6_getpmtu(ro_pmtu, ro, ifp, &finaldst, &mtu, 787 &alwaysfrag)) != 0) 788 goto bad; 789 #ifdef IPSEC 790 if (needipsectun) 791 mtu = IPV6_MMTU; 792 #endif 793 794 /* 795 * The caller of this function may specify to use the minimum MTU 796 * in some cases. 797 * An advanced API option (IPV6_USE_MIN_MTU) can also override MTU 798 * setting. The logic is a bit complicated; by default, unicast 799 * packets will follow path MTU while multicast packets will be sent at 800 * the minimum MTU. If IP6PO_MINMTU_ALL is specified, all packets 801 * including unicast ones will be sent at the minimum MTU. Multicast 802 * packets will always be sent at the minimum MTU unless 803 * IP6PO_MINMTU_DISABLE is explicitly specified. 804 * See RFC 3542 for more details. 805 */ 806 if (mtu > IPV6_MMTU) { 807 if ((flags & IPV6_MINMTU)) 808 mtu = IPV6_MMTU; 809 else if (opt && opt->ip6po_minmtu == IP6PO_MINMTU_ALL) 810 mtu = IPV6_MMTU; 811 else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) && 812 (opt == NULL || 813 opt->ip6po_minmtu != IP6PO_MINMTU_DISABLE)) { 814 mtu = IPV6_MMTU; 815 } 816 } 817 818 /* 819 * clear embedded scope identifiers if necessary. 820 * in6_clearscope will touch the addresses only when necessary. 821 */ 822 in6_clearscope(&ip6->ip6_src); 823 in6_clearscope(&ip6->ip6_dst); 824 825 /* 826 * If the outgoing packet contains a hop-by-hop options header, 827 * it must be examined and processed even by the source node. 828 * (RFC 2460, section 4.) 829 */ 830 if (exthdrs.ip6e_hbh) { 831 struct ip6_hbh *hbh = mtod(exthdrs.ip6e_hbh, struct ip6_hbh *); 832 u_int32_t dummy1; /* XXX unused */ 833 u_int32_t dummy2; /* XXX unused */ 834 835 /* 836 * XXX: if we have to send an ICMPv6 error to the sender, 837 * we need the M_LOOP flag since icmp6_error() expects 838 * the IPv6 and the hop-by-hop options header are 839 * continuous unless the flag is set. 840 */ 841 m->m_flags |= M_LOOP; 842 m->m_pkthdr.rcvif = ifp; 843 if (ip6_process_hopopts(m, (u_int8_t *)(hbh + 1), 844 ((hbh->ip6h_len + 1) << 3) - sizeof(struct ip6_hbh), 845 &dummy1, &dummy2) < 0) { 846 /* m was already freed at this point */ 847 error = EINVAL;/* better error? */ 848 goto done; 849 } 850 m->m_flags &= ~M_LOOP; /* XXX */ 851 m->m_pkthdr.rcvif = NULL; 852 } 853 854 #ifdef PFIL_HOOKS 855 /* 856 * Run through list of hooks for output packets. 857 */ 858 if ((error = pfil_run_hooks(&inet6_pfil_hook, &m, ifp, PFIL_OUT)) != 0) 859 goto done; 860 if (m == NULL) 861 goto done; 862 ip6 = mtod(m, struct ip6_hdr *); 863 #endif /* PFIL_HOOKS */ 864 /* 865 * Send the packet to the outgoing interface. 866 * If necessary, do IPv6 fragmentation before sending. 867 * 868 * the logic here is rather complex: 869 * 1: normal case (dontfrag == 0, alwaysfrag == 0) 870 * 1-a: send as is if tlen <= path mtu 871 * 1-b: fragment if tlen > path mtu 872 * 873 * 2: if user asks us not to fragment (dontfrag == 1) 874 * 2-a: send as is if tlen <= interface mtu 875 * 2-b: error if tlen > interface mtu 876 * 877 * 3: if we always need to attach fragment header (alwaysfrag == 1) 878 * always fragment 879 * 880 * 4: if dontfrag == 1 && alwaysfrag == 1 881 * error, as we cannot handle this conflicting request 882 */ 883 tlen = m->m_pkthdr.len; 884 885 if (opt && (opt->ip6po_flags & IP6PO_DONTFRAG)) 886 dontfrag = 1; 887 else 888 dontfrag = 0; 889 890 if (dontfrag && alwaysfrag) { /* case 4 */ 891 /* conflicting request - can't transmit */ 892 error = EMSGSIZE; 893 goto bad; 894 } 895 if (dontfrag && tlen > IN6_LINKMTU(ifp)) { /* case 2-b */ 896 /* 897 * Even if the DONTFRAG option is specified, we cannot send the 898 * packet when the data length is larger than the MTU of the 899 * outgoing interface. 900 * Notify the error by sending IPV6_PATHMTU ancillary data as 901 * well as returning an error code (the latter is not described 902 * in the API spec.) 903 */ 904 u_int32_t mtu32; 905 struct ip6ctlparam ip6cp; 906 907 mtu32 = (u_int32_t)mtu; 908 bzero(&ip6cp, sizeof(ip6cp)); 909 ip6cp.ip6c_cmdarg = (void *)&mtu32; 910 pfctlinput2(PRC_MSGSIZE, (struct sockaddr *)&ro_pmtu->ro_dst, 911 (void *)&ip6cp); 912 913 error = EMSGSIZE; 914 goto bad; 915 } 916 917 /* 918 * transmit packet without fragmentation 919 */ 920 if (dontfrag || (!alwaysfrag && tlen <= mtu)) { /* case 1-a and 2-a */ 921 struct in6_ifaddr *ia6; 922 int sw_csum; 923 924 ip6 = mtod(m, struct ip6_hdr *); 925 ia6 = in6_ifawithifp(ifp, &ip6->ip6_src); 926 if (ia6) { 927 /* Record statistics for this interface address. */ 928 ia6->ia_ifa.ifa_data.ifad_outbytes += m->m_pkthdr.len; 929 } 930 #ifdef IPSEC 931 /* clean ipsec history once it goes out of the node */ 932 ipsec_delaux(m); 933 #endif 934 935 sw_csum = m->m_pkthdr.csum_flags & ~ifp->if_csum_flags_tx; 936 if ((sw_csum & (M_CSUM_UDPv6|M_CSUM_TCPv6)) != 0) { 937 if (IN6_NEED_CHECKSUM(ifp, 938 sw_csum & (M_CSUM_UDPv6|M_CSUM_TCPv6))) { 939 in6_delayed_cksum(m); 940 } 941 m->m_pkthdr.csum_flags &= ~(M_CSUM_UDPv6|M_CSUM_TCPv6); 942 } 943 944 error = nd6_output(ifp, origifp, m, dst, rt); 945 goto done; 946 } 947 948 /* 949 * try to fragment the packet. case 1-b and 3 950 */ 951 if (mtu < IPV6_MMTU) { 952 /* path MTU cannot be less than IPV6_MMTU */ 953 error = EMSGSIZE; 954 in6_ifstat_inc(ifp, ifs6_out_fragfail); 955 goto bad; 956 } else if (ip6->ip6_plen == 0) { 957 /* jumbo payload cannot be fragmented */ 958 error = EMSGSIZE; 959 in6_ifstat_inc(ifp, ifs6_out_fragfail); 960 goto bad; 961 } else { 962 struct mbuf **mnext, *m_frgpart; 963 struct ip6_frag *ip6f; 964 u_int32_t id = htonl(ip6_randomid()); 965 u_char nextproto; 966 #if 0 /* see below */ 967 struct ip6ctlparam ip6cp; 968 u_int32_t mtu32; 969 #endif 970 971 /* 972 * Too large for the destination or interface; 973 * fragment if possible. 974 * Must be able to put at least 8 bytes per fragment. 975 */ 976 hlen = unfragpartlen; 977 if (mtu > IPV6_MAXPACKET) 978 mtu = IPV6_MAXPACKET; 979 980 #if 0 981 /* 982 * It is believed this code is a leftover from the 983 * development of the IPV6_RECVPATHMTU sockopt and 984 * associated work to implement RFC3542. 985 * It's not entirely clear what the intent of the API 986 * is at this point, so disable this code for now. 987 * The IPV6_RECVPATHMTU sockopt and/or IPV6_DONTFRAG 988 * will send notifications if the application requests. 989 */ 990 991 /* Notify a proper path MTU to applications. */ 992 mtu32 = (u_int32_t)mtu; 993 bzero(&ip6cp, sizeof(ip6cp)); 994 ip6cp.ip6c_cmdarg = (void *)&mtu32; 995 pfctlinput2(PRC_MSGSIZE, (struct sockaddr *)&ro_pmtu->ro_dst, 996 (void *)&ip6cp); 997 #endif 998 999 len = (mtu - hlen - sizeof(struct ip6_frag)) & ~7; 1000 if (len < 8) { 1001 error = EMSGSIZE; 1002 in6_ifstat_inc(ifp, ifs6_out_fragfail); 1003 goto bad; 1004 } 1005 1006 mnext = &m->m_nextpkt; 1007 1008 /* 1009 * Change the next header field of the last header in the 1010 * unfragmentable part. 1011 */ 1012 if (exthdrs.ip6e_rthdr) { 1013 nextproto = *mtod(exthdrs.ip6e_rthdr, u_char *); 1014 *mtod(exthdrs.ip6e_rthdr, u_char *) = IPPROTO_FRAGMENT; 1015 } else if (exthdrs.ip6e_dest1) { 1016 nextproto = *mtod(exthdrs.ip6e_dest1, u_char *); 1017 *mtod(exthdrs.ip6e_dest1, u_char *) = IPPROTO_FRAGMENT; 1018 } else if (exthdrs.ip6e_hbh) { 1019 nextproto = *mtod(exthdrs.ip6e_hbh, u_char *); 1020 *mtod(exthdrs.ip6e_hbh, u_char *) = IPPROTO_FRAGMENT; 1021 } else { 1022 nextproto = ip6->ip6_nxt; 1023 ip6->ip6_nxt = IPPROTO_FRAGMENT; 1024 } 1025 1026 if ((m->m_pkthdr.csum_flags & (M_CSUM_UDPv6|M_CSUM_TCPv6)) 1027 != 0) { 1028 if (IN6_NEED_CHECKSUM(ifp, 1029 m->m_pkthdr.csum_flags & 1030 (M_CSUM_UDPv6|M_CSUM_TCPv6))) { 1031 in6_delayed_cksum(m); 1032 } 1033 m->m_pkthdr.csum_flags &= ~(M_CSUM_UDPv6|M_CSUM_TCPv6); 1034 } 1035 1036 /* 1037 * Loop through length of segment after first fragment, 1038 * make new header and copy data of each part and link onto 1039 * chain. 1040 */ 1041 m0 = m; 1042 for (off = hlen; off < tlen; off += len) { 1043 struct mbuf *mlast; 1044 1045 MGETHDR(m, M_DONTWAIT, MT_HEADER); 1046 if (!m) { 1047 error = ENOBUFS; 1048 ip6stat.ip6s_odropped++; 1049 goto sendorfree; 1050 } 1051 m->m_pkthdr.rcvif = NULL; 1052 m->m_flags = m0->m_flags & M_COPYFLAGS; 1053 *mnext = m; 1054 mnext = &m->m_nextpkt; 1055 m->m_data += max_linkhdr; 1056 mhip6 = mtod(m, struct ip6_hdr *); 1057 *mhip6 = *ip6; 1058 m->m_len = sizeof(*mhip6); 1059 error = ip6_insertfraghdr(m0, m, hlen, &ip6f); 1060 if (error) { 1061 ip6stat.ip6s_odropped++; 1062 goto sendorfree; 1063 } 1064 ip6f->ip6f_offlg = htons((u_int16_t)((off - hlen) & ~7)); 1065 if (off + len >= tlen) 1066 len = tlen - off; 1067 else 1068 ip6f->ip6f_offlg |= IP6F_MORE_FRAG; 1069 mhip6->ip6_plen = htons((u_int16_t)(len + hlen + 1070 sizeof(*ip6f) - sizeof(struct ip6_hdr))); 1071 if ((m_frgpart = m_copy(m0, off, len)) == 0) { 1072 error = ENOBUFS; 1073 ip6stat.ip6s_odropped++; 1074 goto sendorfree; 1075 } 1076 for (mlast = m; mlast->m_next; mlast = mlast->m_next) 1077 ; 1078 mlast->m_next = m_frgpart; 1079 m->m_pkthdr.len = len + hlen + sizeof(*ip6f); 1080 m->m_pkthdr.rcvif = (struct ifnet *)0; 1081 ip6f->ip6f_reserved = 0; 1082 ip6f->ip6f_ident = id; 1083 ip6f->ip6f_nxt = nextproto; 1084 ip6stat.ip6s_ofragments++; 1085 in6_ifstat_inc(ifp, ifs6_out_fragcreat); 1086 } 1087 1088 in6_ifstat_inc(ifp, ifs6_out_fragok); 1089 } 1090 1091 /* 1092 * Remove leading garbages. 1093 */ 1094 sendorfree: 1095 m = m0->m_nextpkt; 1096 m0->m_nextpkt = 0; 1097 m_freem(m0); 1098 for (m0 = m; m; m = m0) { 1099 m0 = m->m_nextpkt; 1100 m->m_nextpkt = 0; 1101 if (error == 0) { 1102 struct in6_ifaddr *ia6; 1103 ip6 = mtod(m, struct ip6_hdr *); 1104 ia6 = in6_ifawithifp(ifp, &ip6->ip6_src); 1105 if (ia6) { 1106 /* 1107 * Record statistics for this interface 1108 * address. 1109 */ 1110 ia6->ia_ifa.ifa_data.ifad_outbytes += 1111 m->m_pkthdr.len; 1112 } 1113 #ifdef IPSEC 1114 /* clean ipsec history once it goes out of the node */ 1115 ipsec_delaux(m); 1116 #endif 1117 error = nd6_output(ifp, origifp, m, dst, rt); 1118 } else 1119 m_freem(m); 1120 } 1121 1122 if (error == 0) 1123 ip6stat.ip6s_fragmented++; 1124 1125 done: 1126 if (ro == &ip6route && ro->ro_rt) { /* brace necessary for RTFREE */ 1127 RTFREE(ro->ro_rt); 1128 } else if (ro_pmtu == &ip6route && ro_pmtu->ro_rt) { 1129 RTFREE(ro_pmtu->ro_rt); 1130 } 1131 1132 #ifdef IPSEC 1133 if (sp != NULL) 1134 key_freesp(sp); 1135 #endif /* IPSEC */ 1136 1137 return (error); 1138 1139 freehdrs: 1140 m_freem(exthdrs.ip6e_hbh); /* m_freem will check if mbuf is 0 */ 1141 m_freem(exthdrs.ip6e_dest1); 1142 m_freem(exthdrs.ip6e_rthdr); 1143 m_freem(exthdrs.ip6e_dest2); 1144 /* FALLTHROUGH */ 1145 bad: 1146 m_freem(m); 1147 goto done; 1148 } 1149 1150 static int 1151 ip6_copyexthdr(mp, hdr, hlen) 1152 struct mbuf **mp; 1153 caddr_t hdr; 1154 int hlen; 1155 { 1156 struct mbuf *m; 1157 1158 if (hlen > MCLBYTES) 1159 return (ENOBUFS); /* XXX */ 1160 1161 MGET(m, M_DONTWAIT, MT_DATA); 1162 if (!m) 1163 return (ENOBUFS); 1164 1165 if (hlen > MLEN) { 1166 MCLGET(m, M_DONTWAIT); 1167 if ((m->m_flags & M_EXT) == 0) { 1168 m_free(m); 1169 return (ENOBUFS); 1170 } 1171 } 1172 m->m_len = hlen; 1173 if (hdr) 1174 bcopy(hdr, mtod(m, caddr_t), hlen); 1175 1176 *mp = m; 1177 return (0); 1178 } 1179 1180 /* 1181 * Process a delayed payload checksum calculation. 1182 */ 1183 void 1184 in6_delayed_cksum(struct mbuf *m) 1185 { 1186 uint16_t csum, offset; 1187 1188 KASSERT((m->m_pkthdr.csum_flags & (M_CSUM_UDPv6|M_CSUM_TCPv6)) != 0); 1189 KASSERT((~m->m_pkthdr.csum_flags & (M_CSUM_UDPv6|M_CSUM_TCPv6)) != 0); 1190 KASSERT((m->m_pkthdr.csum_flags 1191 & (M_CSUM_UDPv4|M_CSUM_TCPv4|M_CSUM_TSOv4)) == 0); 1192 1193 offset = M_CSUM_DATA_IPv6_HL(m->m_pkthdr.csum_data); 1194 csum = in6_cksum(m, 0, offset, m->m_pkthdr.len - offset); 1195 if (csum == 0 && (m->m_pkthdr.csum_flags & M_CSUM_UDPv6) != 0) { 1196 csum = 0xffff; 1197 } 1198 1199 offset += M_CSUM_DATA_IPv6_OFFSET(m->m_pkthdr.csum_data); 1200 if ((offset + sizeof(csum)) > m->m_len) { 1201 m_copyback(m, offset, sizeof(csum), &csum); 1202 } else { 1203 *(uint16_t *)(mtod(m, caddr_t) + offset) = csum; 1204 } 1205 } 1206 1207 /* 1208 * Insert jumbo payload option. 1209 */ 1210 static int 1211 ip6_insert_jumboopt(exthdrs, plen) 1212 struct ip6_exthdrs *exthdrs; 1213 u_int32_t plen; 1214 { 1215 struct mbuf *mopt; 1216 u_int8_t *optbuf; 1217 u_int32_t v; 1218 1219 #define JUMBOOPTLEN 8 /* length of jumbo payload option and padding */ 1220 1221 /* 1222 * If there is no hop-by-hop options header, allocate new one. 1223 * If there is one but it doesn't have enough space to store the 1224 * jumbo payload option, allocate a cluster to store the whole options. 1225 * Otherwise, use it to store the options. 1226 */ 1227 if (exthdrs->ip6e_hbh == 0) { 1228 MGET(mopt, M_DONTWAIT, MT_DATA); 1229 if (mopt == 0) 1230 return (ENOBUFS); 1231 mopt->m_len = JUMBOOPTLEN; 1232 optbuf = mtod(mopt, u_int8_t *); 1233 optbuf[1] = 0; /* = ((JUMBOOPTLEN) >> 3) - 1 */ 1234 exthdrs->ip6e_hbh = mopt; 1235 } else { 1236 struct ip6_hbh *hbh; 1237 1238 mopt = exthdrs->ip6e_hbh; 1239 if (M_TRAILINGSPACE(mopt) < JUMBOOPTLEN) { 1240 /* 1241 * XXX assumption: 1242 * - exthdrs->ip6e_hbh is not referenced from places 1243 * other than exthdrs. 1244 * - exthdrs->ip6e_hbh is not an mbuf chain. 1245 */ 1246 int oldoptlen = mopt->m_len; 1247 struct mbuf *n; 1248 1249 /* 1250 * XXX: give up if the whole (new) hbh header does 1251 * not fit even in an mbuf cluster. 1252 */ 1253 if (oldoptlen + JUMBOOPTLEN > MCLBYTES) 1254 return (ENOBUFS); 1255 1256 /* 1257 * As a consequence, we must always prepare a cluster 1258 * at this point. 1259 */ 1260 MGET(n, M_DONTWAIT, MT_DATA); 1261 if (n) { 1262 MCLGET(n, M_DONTWAIT); 1263 if ((n->m_flags & M_EXT) == 0) { 1264 m_freem(n); 1265 n = NULL; 1266 } 1267 } 1268 if (!n) 1269 return (ENOBUFS); 1270 n->m_len = oldoptlen + JUMBOOPTLEN; 1271 bcopy(mtod(mopt, caddr_t), mtod(n, caddr_t), 1272 oldoptlen); 1273 optbuf = mtod(n, u_int8_t *) + oldoptlen; 1274 m_freem(mopt); 1275 mopt = exthdrs->ip6e_hbh = n; 1276 } else { 1277 optbuf = mtod(mopt, u_int8_t *) + mopt->m_len; 1278 mopt->m_len += JUMBOOPTLEN; 1279 } 1280 optbuf[0] = IP6OPT_PADN; 1281 optbuf[1] = 0; 1282 1283 /* 1284 * Adjust the header length according to the pad and 1285 * the jumbo payload option. 1286 */ 1287 hbh = mtod(mopt, struct ip6_hbh *); 1288 hbh->ip6h_len += (JUMBOOPTLEN >> 3); 1289 } 1290 1291 /* fill in the option. */ 1292 optbuf[2] = IP6OPT_JUMBO; 1293 optbuf[3] = 4; 1294 v = (u_int32_t)htonl(plen + JUMBOOPTLEN); 1295 bcopy(&v, &optbuf[4], sizeof(u_int32_t)); 1296 1297 /* finally, adjust the packet header length */ 1298 exthdrs->ip6e_ip6->m_pkthdr.len += JUMBOOPTLEN; 1299 1300 return (0); 1301 #undef JUMBOOPTLEN 1302 } 1303 1304 /* 1305 * Insert fragment header and copy unfragmentable header portions. 1306 */ 1307 static int 1308 ip6_insertfraghdr(m0, m, hlen, frghdrp) 1309 struct mbuf *m0, *m; 1310 int hlen; 1311 struct ip6_frag **frghdrp; 1312 { 1313 struct mbuf *n, *mlast; 1314 1315 if (hlen > sizeof(struct ip6_hdr)) { 1316 n = m_copym(m0, sizeof(struct ip6_hdr), 1317 hlen - sizeof(struct ip6_hdr), M_DONTWAIT); 1318 if (n == 0) 1319 return (ENOBUFS); 1320 m->m_next = n; 1321 } else 1322 n = m; 1323 1324 /* Search for the last mbuf of unfragmentable part. */ 1325 for (mlast = n; mlast->m_next; mlast = mlast->m_next) 1326 ; 1327 1328 if ((mlast->m_flags & M_EXT) == 0 && 1329 M_TRAILINGSPACE(mlast) >= sizeof(struct ip6_frag)) { 1330 /* use the trailing space of the last mbuf for the fragment hdr */ 1331 *frghdrp = (struct ip6_frag *)(mtod(mlast, caddr_t) + 1332 mlast->m_len); 1333 mlast->m_len += sizeof(struct ip6_frag); 1334 m->m_pkthdr.len += sizeof(struct ip6_frag); 1335 } else { 1336 /* allocate a new mbuf for the fragment header */ 1337 struct mbuf *mfrg; 1338 1339 MGET(mfrg, M_DONTWAIT, MT_DATA); 1340 if (mfrg == 0) 1341 return (ENOBUFS); 1342 mfrg->m_len = sizeof(struct ip6_frag); 1343 *frghdrp = mtod(mfrg, struct ip6_frag *); 1344 mlast->m_next = mfrg; 1345 } 1346 1347 return (0); 1348 } 1349 1350 static int 1351 ip6_getpmtu(ro_pmtu, ro, ifp, dst, mtup, alwaysfragp) 1352 struct route_in6 *ro_pmtu, *ro; 1353 struct ifnet *ifp; 1354 struct in6_addr *dst; 1355 u_long *mtup; 1356 int *alwaysfragp; 1357 { 1358 u_int32_t mtu = 0; 1359 int alwaysfrag = 0; 1360 int error = 0; 1361 1362 if (ro_pmtu != ro) { 1363 /* The first hop and the final destination may differ. */ 1364 struct sockaddr_in6 *sa6_dst = 1365 (struct sockaddr_in6 *)&ro_pmtu->ro_dst; 1366 if (ro_pmtu->ro_rt && 1367 ((ro_pmtu->ro_rt->rt_flags & RTF_UP) == 0 || 1368 !IN6_ARE_ADDR_EQUAL(&sa6_dst->sin6_addr, dst))) { 1369 RTFREE(ro_pmtu->ro_rt); 1370 ro_pmtu->ro_rt = (struct rtentry *)NULL; 1371 } 1372 if (ro_pmtu->ro_rt == NULL) { 1373 bzero(sa6_dst, sizeof(*sa6_dst)); /* for safety */ 1374 sa6_dst->sin6_family = AF_INET6; 1375 sa6_dst->sin6_len = sizeof(struct sockaddr_in6); 1376 sa6_dst->sin6_addr = *dst; 1377 1378 rtalloc((struct route *)ro_pmtu); 1379 } 1380 } 1381 if (ro_pmtu->ro_rt) { 1382 u_int32_t ifmtu; 1383 1384 if (ifp == NULL) 1385 ifp = ro_pmtu->ro_rt->rt_ifp; 1386 ifmtu = IN6_LINKMTU(ifp); 1387 mtu = ro_pmtu->ro_rt->rt_rmx.rmx_mtu; 1388 if (mtu == 0) 1389 mtu = ifmtu; 1390 else if (mtu < IPV6_MMTU) { 1391 /* 1392 * RFC2460 section 5, last paragraph: 1393 * if we record ICMPv6 too big message with 1394 * mtu < IPV6_MMTU, transmit packets sized IPV6_MMTU 1395 * or smaller, with fragment header attached. 1396 * (fragment header is needed regardless from the 1397 * packet size, for translators to identify packets) 1398 */ 1399 alwaysfrag = 1; 1400 mtu = IPV6_MMTU; 1401 } else if (mtu > ifmtu) { 1402 /* 1403 * The MTU on the route is larger than the MTU on 1404 * the interface! This shouldn't happen, unless the 1405 * MTU of the interface has been changed after the 1406 * interface was brought up. Change the MTU in the 1407 * route to match the interface MTU (as long as the 1408 * field isn't locked). 1409 */ 1410 mtu = ifmtu; 1411 if (!(ro_pmtu->ro_rt->rt_rmx.rmx_locks & RTV_MTU)) 1412 ro_pmtu->ro_rt->rt_rmx.rmx_mtu = mtu; 1413 } 1414 } else if (ifp) { 1415 mtu = IN6_LINKMTU(ifp); 1416 } else 1417 error = EHOSTUNREACH; /* XXX */ 1418 1419 *mtup = mtu; 1420 if (alwaysfragp) 1421 *alwaysfragp = alwaysfrag; 1422 return (error); 1423 } 1424 1425 /* 1426 * IP6 socket option processing. 1427 */ 1428 int 1429 ip6_ctloutput(op, so, level, optname, mp) 1430 int op; 1431 struct socket *so; 1432 int level, optname; 1433 struct mbuf **mp; 1434 { 1435 int privileged, optdatalen, uproto; 1436 void *optdata; 1437 struct in6pcb *in6p = sotoin6pcb(so); 1438 struct mbuf *m = *mp; 1439 int error, optval; 1440 int optlen; 1441 struct proc *p = curproc; /* XXX */ 1442 1443 optlen = m ? m->m_len : 0; 1444 error = optval = 0; 1445 privileged = (p == 0 || kauth_authorize_generic(p->p_cred, KAUTH_GENERIC_ISSUSER, &p->p_acflag)) ? 0 : 1; 1446 uproto = (int)so->so_proto->pr_protocol; 1447 1448 if (level == IPPROTO_IPV6) { 1449 switch (op) { 1450 case PRCO_SETOPT: 1451 switch (optname) { 1452 #ifdef RFC2292 1453 case IPV6_2292PKTOPTIONS: 1454 /* m is freed in ip6_pcbopts */ 1455 error = ip6_pcbopts(&in6p->in6p_outputopts, 1456 m, so); 1457 break; 1458 #endif 1459 1460 /* 1461 * Use of some Hop-by-Hop options or some 1462 * Destination options, might require special 1463 * privilege. That is, normal applications 1464 * (without special privilege) might be forbidden 1465 * from setting certain options in outgoing packets, 1466 * and might never see certain options in received 1467 * packets. [RFC 2292 Section 6] 1468 * KAME specific note: 1469 * KAME prevents non-privileged users from sending or 1470 * receiving ANY hbh/dst options in order to avoid 1471 * overhead of parsing options in the kernel. 1472 */ 1473 case IPV6_RECVHOPOPTS: 1474 case IPV6_RECVDSTOPTS: 1475 case IPV6_RECVRTHDRDSTOPTS: 1476 if (!privileged) { 1477 error = EPERM; 1478 break; 1479 } 1480 /* FALLTHROUGH */ 1481 case IPV6_UNICAST_HOPS: 1482 case IPV6_HOPLIMIT: 1483 case IPV6_FAITH: 1484 1485 case IPV6_RECVPKTINFO: 1486 case IPV6_RECVHOPLIMIT: 1487 case IPV6_RECVRTHDR: 1488 case IPV6_RECVPATHMTU: 1489 case IPV6_RECVTCLASS: 1490 case IPV6_V6ONLY: 1491 if (optlen != sizeof(int)) { 1492 error = EINVAL; 1493 break; 1494 } 1495 optval = *mtod(m, int *); 1496 switch (optname) { 1497 1498 case IPV6_UNICAST_HOPS: 1499 if (optval < -1 || optval >= 256) 1500 error = EINVAL; 1501 else { 1502 /* -1 = kernel default */ 1503 in6p->in6p_hops = optval; 1504 } 1505 break; 1506 #define OPTSET(bit) \ 1507 do { \ 1508 if (optval) \ 1509 in6p->in6p_flags |= (bit); \ 1510 else \ 1511 in6p->in6p_flags &= ~(bit); \ 1512 } while (/*CONSTCOND*/ 0) 1513 1514 #ifdef RFC2292 1515 #define OPTSET2292(bit) \ 1516 do { \ 1517 in6p->in6p_flags |= IN6P_RFC2292; \ 1518 if (optval) \ 1519 in6p->in6p_flags |= (bit); \ 1520 else \ 1521 in6p->in6p_flags &= ~(bit); \ 1522 } while (/*CONSTCOND*/ 0) 1523 #endif 1524 1525 #define OPTBIT(bit) (in6p->in6p_flags & (bit) ? 1 : 0) 1526 1527 case IPV6_RECVPKTINFO: 1528 #ifdef RFC2292 1529 /* cannot mix with RFC2292 */ 1530 if (OPTBIT(IN6P_RFC2292)) { 1531 error = EINVAL; 1532 break; 1533 } 1534 #endif 1535 OPTSET(IN6P_PKTINFO); 1536 break; 1537 1538 case IPV6_HOPLIMIT: 1539 { 1540 struct ip6_pktopts **optp; 1541 1542 #ifdef RFC2292 1543 /* cannot mix with RFC2292 */ 1544 if (OPTBIT(IN6P_RFC2292)) { 1545 error = EINVAL; 1546 break; 1547 } 1548 #endif 1549 optp = &in6p->in6p_outputopts; 1550 error = ip6_pcbopt(IPV6_HOPLIMIT, 1551 (u_char *)&optval, 1552 sizeof(optval), 1553 optp, 1554 privileged, uproto); 1555 break; 1556 } 1557 1558 case IPV6_RECVHOPLIMIT: 1559 #ifdef RFC2292 1560 /* cannot mix with RFC2292 */ 1561 if (OPTBIT(IN6P_RFC2292)) { 1562 error = EINVAL; 1563 break; 1564 } 1565 #endif 1566 OPTSET(IN6P_HOPLIMIT); 1567 break; 1568 1569 case IPV6_RECVHOPOPTS: 1570 #ifdef RFC2292 1571 /* cannot mix with RFC2292 */ 1572 if (OPTBIT(IN6P_RFC2292)) { 1573 error = EINVAL; 1574 break; 1575 } 1576 #endif 1577 OPTSET(IN6P_HOPOPTS); 1578 break; 1579 1580 case IPV6_RECVDSTOPTS: 1581 #ifdef RFC2292 1582 /* cannot mix with RFC2292 */ 1583 if (OPTBIT(IN6P_RFC2292)) { 1584 error = EINVAL; 1585 break; 1586 } 1587 #endif 1588 OPTSET(IN6P_DSTOPTS); 1589 break; 1590 1591 case IPV6_RECVRTHDRDSTOPTS: 1592 #ifdef RFC2292 1593 /* cannot mix with RFC2292 */ 1594 if (OPTBIT(IN6P_RFC2292)) { 1595 error = EINVAL; 1596 break; 1597 } 1598 #endif 1599 OPTSET(IN6P_RTHDRDSTOPTS); 1600 break; 1601 1602 case IPV6_RECVRTHDR: 1603 #ifdef RFC2292 1604 /* cannot mix with RFC2292 */ 1605 if (OPTBIT(IN6P_RFC2292)) { 1606 error = EINVAL; 1607 break; 1608 } 1609 #endif 1610 OPTSET(IN6P_RTHDR); 1611 break; 1612 1613 case IPV6_FAITH: 1614 OPTSET(IN6P_FAITH); 1615 break; 1616 1617 case IPV6_RECVPATHMTU: 1618 /* 1619 * We ignore this option for TCP 1620 * sockets. 1621 * (RFC3542 leaves this case 1622 * unspecified.) 1623 */ 1624 if (uproto != IPPROTO_TCP) 1625 OPTSET(IN6P_MTU); 1626 break; 1627 1628 case IPV6_V6ONLY: 1629 /* 1630 * make setsockopt(IPV6_V6ONLY) 1631 * available only prior to bind(2). 1632 * see ipng mailing list, Jun 22 2001. 1633 */ 1634 if (in6p->in6p_lport || 1635 !IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) { 1636 error = EINVAL; 1637 break; 1638 } 1639 #ifdef INET6_BINDV6ONLY 1640 if (!optval) 1641 error = EINVAL; 1642 #else 1643 OPTSET(IN6P_IPV6_V6ONLY); 1644 #endif 1645 break; 1646 case IPV6_RECVTCLASS: 1647 #ifdef RFC2292 1648 /* cannot mix with RFC2292 XXX */ 1649 if (OPTBIT(IN6P_RFC2292)) { 1650 error = EINVAL; 1651 break; 1652 } 1653 #endif 1654 OPTSET(IN6P_TCLASS); 1655 break; 1656 1657 } 1658 break; 1659 1660 case IPV6_OTCLASS: 1661 { 1662 struct ip6_pktopts **optp; 1663 u_int8_t tclass; 1664 1665 if (optlen != sizeof(tclass)) { 1666 error = EINVAL; 1667 break; 1668 } 1669 tclass = *mtod(m, u_int8_t *); 1670 optp = &in6p->in6p_outputopts; 1671 error = ip6_pcbopt(optname, 1672 (u_char *)&tclass, 1673 sizeof(tclass), 1674 optp, 1675 privileged, uproto); 1676 break; 1677 } 1678 1679 case IPV6_TCLASS: 1680 case IPV6_DONTFRAG: 1681 case IPV6_USE_MIN_MTU: 1682 if (optlen != sizeof(optval)) { 1683 error = EINVAL; 1684 break; 1685 } 1686 optval = *mtod(m, int *); 1687 { 1688 struct ip6_pktopts **optp; 1689 optp = &in6p->in6p_outputopts; 1690 error = ip6_pcbopt(optname, 1691 (u_char *)&optval, 1692 sizeof(optval), 1693 optp, 1694 privileged, uproto); 1695 break; 1696 } 1697 1698 #ifdef RFC2292 1699 case IPV6_2292PKTINFO: 1700 case IPV6_2292HOPLIMIT: 1701 case IPV6_2292HOPOPTS: 1702 case IPV6_2292DSTOPTS: 1703 case IPV6_2292RTHDR: 1704 /* RFC 2292 */ 1705 if (optlen != sizeof(int)) { 1706 error = EINVAL; 1707 break; 1708 } 1709 optval = *mtod(m, int *); 1710 switch (optname) { 1711 case IPV6_2292PKTINFO: 1712 OPTSET2292(IN6P_PKTINFO); 1713 break; 1714 case IPV6_2292HOPLIMIT: 1715 OPTSET2292(IN6P_HOPLIMIT); 1716 break; 1717 case IPV6_2292HOPOPTS: 1718 /* 1719 * Check super-user privilege. 1720 * See comments for IPV6_RECVHOPOPTS. 1721 */ 1722 if (!privileged) 1723 return (EPERM); 1724 OPTSET2292(IN6P_HOPOPTS); 1725 break; 1726 case IPV6_2292DSTOPTS: 1727 if (!privileged) 1728 return (EPERM); 1729 OPTSET2292(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); /* XXX */ 1730 break; 1731 case IPV6_2292RTHDR: 1732 OPTSET2292(IN6P_RTHDR); 1733 break; 1734 } 1735 break; 1736 #endif 1737 case IPV6_PKTINFO: 1738 case IPV6_HOPOPTS: 1739 case IPV6_RTHDR: 1740 case IPV6_DSTOPTS: 1741 case IPV6_RTHDRDSTOPTS: 1742 case IPV6_NEXTHOP: 1743 { 1744 /* new advanced API (RFC3542) */ 1745 u_char *optbuf; 1746 int optbuflen; 1747 struct ip6_pktopts **optp; 1748 1749 #ifdef RFC2292 1750 /* cannot mix with RFC2292 */ 1751 if (OPTBIT(IN6P_RFC2292)) { 1752 error = EINVAL; 1753 break; 1754 } 1755 #endif 1756 1757 if (m && m->m_next) { 1758 error = EINVAL; /* XXX */ 1759 break; 1760 } 1761 if (m) { 1762 optbuf = mtod(m, u_char *); 1763 optbuflen = m->m_len; 1764 } else { 1765 optbuf = NULL; 1766 optbuflen = 0; 1767 } 1768 optp = &in6p->in6p_outputopts; 1769 error = ip6_pcbopt(optname, 1770 optbuf, optbuflen, 1771 optp, privileged, uproto); 1772 break; 1773 } 1774 #undef OPTSET 1775 1776 case IPV6_MULTICAST_IF: 1777 case IPV6_MULTICAST_HOPS: 1778 case IPV6_MULTICAST_LOOP: 1779 case IPV6_JOIN_GROUP: 1780 case IPV6_LEAVE_GROUP: 1781 error = ip6_setmoptions(optname, 1782 &in6p->in6p_moptions, m); 1783 break; 1784 1785 case IPV6_PORTRANGE: 1786 optval = *mtod(m, int *); 1787 1788 switch (optval) { 1789 case IPV6_PORTRANGE_DEFAULT: 1790 in6p->in6p_flags &= ~(IN6P_LOWPORT); 1791 in6p->in6p_flags &= ~(IN6P_HIGHPORT); 1792 break; 1793 1794 case IPV6_PORTRANGE_HIGH: 1795 in6p->in6p_flags &= ~(IN6P_LOWPORT); 1796 in6p->in6p_flags |= IN6P_HIGHPORT; 1797 break; 1798 1799 case IPV6_PORTRANGE_LOW: 1800 in6p->in6p_flags &= ~(IN6P_HIGHPORT); 1801 in6p->in6p_flags |= IN6P_LOWPORT; 1802 break; 1803 1804 default: 1805 error = EINVAL; 1806 break; 1807 } 1808 break; 1809 1810 #ifdef IPSEC 1811 case IPV6_IPSEC_POLICY: 1812 { 1813 caddr_t req = NULL; 1814 size_t len = 0; 1815 if (m) { 1816 req = mtod(m, caddr_t); 1817 len = m->m_len; 1818 } 1819 error = ipsec6_set_policy(in6p, optname, req, 1820 len, privileged); 1821 } 1822 break; 1823 #endif /* IPSEC */ 1824 1825 default: 1826 error = ENOPROTOOPT; 1827 break; 1828 } 1829 if (m) 1830 (void)m_free(m); 1831 break; 1832 1833 case PRCO_GETOPT: 1834 switch (optname) { 1835 #ifdef RFC2292 1836 case IPV6_2292PKTOPTIONS: 1837 /* 1838 * RFC3542 (effectively) deprecated the 1839 * semantics of the 2292-style pktoptions. 1840 * Since it was not reliable in nature (i.e., 1841 * applications had to expect the lack of some 1842 * information after all), it would make sense 1843 * to simplify this part by always returning 1844 * empty data. 1845 */ 1846 *mp = m_get(M_WAIT, MT_SOOPTS); 1847 (*mp)->m_len = 0; 1848 break; 1849 #endif 1850 1851 case IPV6_RECVHOPOPTS: 1852 case IPV6_RECVDSTOPTS: 1853 case IPV6_RECVRTHDRDSTOPTS: 1854 case IPV6_UNICAST_HOPS: 1855 case IPV6_RECVPKTINFO: 1856 case IPV6_RECVHOPLIMIT: 1857 case IPV6_RECVRTHDR: 1858 case IPV6_RECVPATHMTU: 1859 1860 case IPV6_FAITH: 1861 case IPV6_V6ONLY: 1862 case IPV6_PORTRANGE: 1863 case IPV6_RECVTCLASS: 1864 switch (optname) { 1865 1866 case IPV6_RECVHOPOPTS: 1867 optval = OPTBIT(IN6P_HOPOPTS); 1868 break; 1869 1870 case IPV6_RECVDSTOPTS: 1871 optval = OPTBIT(IN6P_DSTOPTS); 1872 break; 1873 1874 case IPV6_RECVRTHDRDSTOPTS: 1875 optval = OPTBIT(IN6P_RTHDRDSTOPTS); 1876 break; 1877 1878 case IPV6_UNICAST_HOPS: 1879 optval = in6p->in6p_hops; 1880 break; 1881 1882 case IPV6_RECVPKTINFO: 1883 optval = OPTBIT(IN6P_PKTINFO); 1884 break; 1885 1886 case IPV6_RECVHOPLIMIT: 1887 optval = OPTBIT(IN6P_HOPLIMIT); 1888 break; 1889 1890 case IPV6_RECVRTHDR: 1891 optval = OPTBIT(IN6P_RTHDR); 1892 break; 1893 1894 case IPV6_RECVPATHMTU: 1895 optval = OPTBIT(IN6P_MTU); 1896 break; 1897 1898 case IPV6_FAITH: 1899 optval = OPTBIT(IN6P_FAITH); 1900 break; 1901 1902 case IPV6_V6ONLY: 1903 optval = OPTBIT(IN6P_IPV6_V6ONLY); 1904 break; 1905 1906 case IPV6_PORTRANGE: 1907 { 1908 int flags; 1909 flags = in6p->in6p_flags; 1910 if (flags & IN6P_HIGHPORT) 1911 optval = IPV6_PORTRANGE_HIGH; 1912 else if (flags & IN6P_LOWPORT) 1913 optval = IPV6_PORTRANGE_LOW; 1914 else 1915 optval = 0; 1916 break; 1917 } 1918 case IPV6_RECVTCLASS: 1919 optval = OPTBIT(IN6P_TCLASS); 1920 break; 1921 1922 } 1923 if (error) 1924 break; 1925 *mp = m = m_get(M_WAIT, MT_SOOPTS); 1926 m->m_len = sizeof(int); 1927 *mtod(m, int *) = optval; 1928 break; 1929 1930 case IPV6_PATHMTU: 1931 { 1932 u_long pmtu = 0; 1933 struct ip6_mtuinfo mtuinfo; 1934 struct route_in6 *ro = (struct route_in6 *)&in6p 1935 ->in6p_route; 1936 1937 if (!(so->so_state & SS_ISCONNECTED)) 1938 return (ENOTCONN); 1939 /* 1940 * XXX: we dot not consider the case of source 1941 * routing, or optional information to specify 1942 * the outgoing interface. 1943 */ 1944 error = ip6_getpmtu(ro, NULL, NULL, 1945 &in6p->in6p_faddr, &pmtu, NULL); 1946 if (error) 1947 break; 1948 if (pmtu > IPV6_MAXPACKET) 1949 pmtu = IPV6_MAXPACKET; 1950 1951 memset(&mtuinfo, 0, sizeof(mtuinfo)); 1952 mtuinfo.ip6m_mtu = (u_int32_t)pmtu; 1953 optdata = (void *)&mtuinfo; 1954 optdatalen = sizeof(mtuinfo); 1955 if (optdatalen > MCLBYTES) 1956 return (EMSGSIZE); /* XXX */ 1957 *mp = m = m_get(M_WAIT, MT_SOOPTS); 1958 if (optdatalen > MLEN) 1959 MCLGET(m, M_WAIT); 1960 m->m_len = optdatalen; 1961 memcpy(mtod(m, void *), optdata, optdatalen); 1962 break; 1963 } 1964 1965 #ifdef RFC2292 1966 case IPV6_2292PKTINFO: 1967 case IPV6_2292HOPLIMIT: 1968 case IPV6_2292HOPOPTS: 1969 case IPV6_2292RTHDR: 1970 case IPV6_2292DSTOPTS: 1971 switch (optname) { 1972 case IPV6_2292PKTINFO: 1973 optval = OPTBIT(IN6P_PKTINFO); 1974 break; 1975 case IPV6_2292HOPLIMIT: 1976 optval = OPTBIT(IN6P_HOPLIMIT); 1977 break; 1978 case IPV6_2292HOPOPTS: 1979 optval = OPTBIT(IN6P_HOPOPTS); 1980 break; 1981 case IPV6_2292RTHDR: 1982 optval = OPTBIT(IN6P_RTHDR); 1983 break; 1984 case IPV6_2292DSTOPTS: 1985 optval = OPTBIT(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); 1986 break; 1987 } 1988 *mp = m = m_get(M_WAIT, MT_SOOPTS); 1989 m->m_len = sizeof(int); 1990 *mtod(m, int *) = optval; 1991 break; 1992 #endif 1993 case IPV6_PKTINFO: 1994 case IPV6_HOPOPTS: 1995 case IPV6_RTHDR: 1996 case IPV6_DSTOPTS: 1997 case IPV6_RTHDRDSTOPTS: 1998 case IPV6_NEXTHOP: 1999 case IPV6_OTCLASS: 2000 case IPV6_TCLASS: 2001 case IPV6_DONTFRAG: 2002 case IPV6_USE_MIN_MTU: 2003 error = ip6_getpcbopt(in6p->in6p_outputopts, 2004 optname, mp); 2005 break; 2006 2007 case IPV6_MULTICAST_IF: 2008 case IPV6_MULTICAST_HOPS: 2009 case IPV6_MULTICAST_LOOP: 2010 case IPV6_JOIN_GROUP: 2011 case IPV6_LEAVE_GROUP: 2012 error = ip6_getmoptions(optname, 2013 in6p->in6p_moptions, mp); 2014 break; 2015 2016 #ifdef IPSEC 2017 case IPV6_IPSEC_POLICY: 2018 { 2019 caddr_t req = NULL; 2020 size_t len = 0; 2021 if (m) { 2022 req = mtod(m, caddr_t); 2023 len = m->m_len; 2024 } 2025 error = ipsec6_get_policy(in6p, req, len, mp); 2026 break; 2027 } 2028 #endif /* IPSEC */ 2029 2030 2031 2032 2033 default: 2034 error = ENOPROTOOPT; 2035 break; 2036 } 2037 break; 2038 } 2039 } else { 2040 error = EINVAL; 2041 if (op == PRCO_SETOPT && *mp) 2042 (void)m_free(*mp); 2043 } 2044 return (error); 2045 } 2046 2047 int 2048 ip6_raw_ctloutput(op, so, level, optname, mp) 2049 int op; 2050 struct socket *so; 2051 int level, optname; 2052 struct mbuf **mp; 2053 { 2054 int error = 0, optval, optlen; 2055 const int icmp6off = offsetof(struct icmp6_hdr, icmp6_cksum); 2056 struct in6pcb *in6p = sotoin6pcb(so); 2057 struct mbuf *m = *mp; 2058 2059 optlen = m ? m->m_len : 0; 2060 2061 if (level != IPPROTO_IPV6) { 2062 if (op == PRCO_SETOPT && *mp) 2063 (void)m_free(*mp); 2064 return (EINVAL); 2065 } 2066 2067 switch (optname) { 2068 case IPV6_CHECKSUM: 2069 /* 2070 * For ICMPv6 sockets, no modification allowed for checksum 2071 * offset, permit "no change" values to help existing apps. 2072 * 2073 * XXX RFC3542 says: "An attempt to set IPV6_CHECKSUM 2074 * for an ICMPv6 socket will fail." The current 2075 * behavior does not meet RFC3542. 2076 */ 2077 switch (op) { 2078 case PRCO_SETOPT: 2079 if (optlen != sizeof(int)) { 2080 error = EINVAL; 2081 break; 2082 } 2083 optval = *mtod(m, int *); 2084 if ((optval % 2) != 0) { 2085 /* the API assumes even offset values */ 2086 error = EINVAL; 2087 } else if (so->so_proto->pr_protocol == 2088 IPPROTO_ICMPV6) { 2089 if (optval != icmp6off) 2090 error = EINVAL; 2091 } else 2092 in6p->in6p_cksum = optval; 2093 break; 2094 2095 case PRCO_GETOPT: 2096 if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) 2097 optval = icmp6off; 2098 else 2099 optval = in6p->in6p_cksum; 2100 2101 *mp = m = m_get(M_WAIT, MT_SOOPTS); 2102 m->m_len = sizeof(int); 2103 *mtod(m, int *) = optval; 2104 break; 2105 2106 default: 2107 error = EINVAL; 2108 break; 2109 } 2110 break; 2111 2112 default: 2113 error = ENOPROTOOPT; 2114 break; 2115 } 2116 2117 if (op == PRCO_SETOPT && m) 2118 (void)m_free(m); 2119 2120 return (error); 2121 } 2122 2123 #ifdef RFC2292 2124 /* 2125 * Set up IP6 options in pcb for insertion in output packets or 2126 * specifying behavior of outgoing packets. 2127 */ 2128 static int 2129 ip6_pcbopts(pktopt, m, so) 2130 struct ip6_pktopts **pktopt; 2131 struct mbuf *m; 2132 struct socket *so; 2133 { 2134 struct ip6_pktopts *opt = *pktopt; 2135 int error = 0; 2136 struct proc *p = curproc; /* XXX */ 2137 int priv = 0; 2138 2139 /* turn off any old options. */ 2140 if (opt) { 2141 #ifdef DIAGNOSTIC 2142 if (opt->ip6po_pktinfo || opt->ip6po_nexthop || 2143 opt->ip6po_hbh || opt->ip6po_dest1 || opt->ip6po_dest2 || 2144 opt->ip6po_rhinfo.ip6po_rhi_rthdr) 2145 printf("ip6_pcbopts: all specified options are cleared.\n"); 2146 #endif 2147 ip6_clearpktopts(opt, -1); 2148 } else 2149 opt = malloc(sizeof(*opt), M_IP6OPT, M_WAITOK); 2150 *pktopt = NULL; 2151 2152 if (!m || m->m_len == 0) { 2153 /* 2154 * Only turning off any previous options, regardless of 2155 * whether the opt is just created or given. 2156 */ 2157 free(opt, M_IP6OPT); 2158 return (0); 2159 } 2160 2161 /* set options specified by user. */ 2162 if (p && !kauth_authorize_generic(p->p_cred, KAUTH_GENERIC_ISSUSER, &p->p_acflag)) 2163 priv = 1; 2164 if ((error = ip6_setpktopts(m, opt, NULL, priv, 2165 so->so_proto->pr_protocol)) != 0) { 2166 ip6_clearpktopts(opt, -1); /* XXX: discard all options */ 2167 free(opt, M_IP6OPT); 2168 return (error); 2169 } 2170 *pktopt = opt; 2171 return (0); 2172 } 2173 #endif 2174 2175 /* 2176 * initialize ip6_pktopts. beware that there are non-zero default values in 2177 * the struct. 2178 */ 2179 void 2180 ip6_initpktopts(struct ip6_pktopts *opt) 2181 { 2182 2183 memset(opt, 0, sizeof(*opt)); 2184 opt->ip6po_hlim = -1; /* -1 means default hop limit */ 2185 opt->ip6po_tclass = -1; /* -1 means default traffic class */ 2186 opt->ip6po_minmtu = IP6PO_MINMTU_MCASTONLY; 2187 } 2188 2189 #define sin6tosa(sin6) ((struct sockaddr *)(sin6)) /* XXX */ 2190 static int 2191 ip6_pcbopt(int optname, u_char *buf, int len, struct ip6_pktopts **pktopt, 2192 int priv, int uproto) 2193 { 2194 struct ip6_pktopts *opt; 2195 2196 if (*pktopt == NULL) { 2197 *pktopt = malloc(sizeof(struct ip6_pktopts), M_IP6OPT, 2198 M_WAITOK); 2199 ip6_initpktopts(*pktopt); 2200 } 2201 opt = *pktopt; 2202 2203 return (ip6_setpktopt(optname, buf, len, opt, priv, 1, 0, uproto)); 2204 } 2205 2206 static int 2207 ip6_getpcbopt(struct ip6_pktopts *pktopt, int optname, struct mbuf **mp) 2208 { 2209 void *optdata = NULL; 2210 int optdatalen = 0; 2211 struct ip6_ext *ip6e; 2212 int error = 0; 2213 struct in6_pktinfo null_pktinfo; 2214 int deftclass = 0, on; 2215 int defminmtu = IP6PO_MINMTU_MCASTONLY; 2216 struct mbuf *m; 2217 2218 switch (optname) { 2219 case IPV6_PKTINFO: 2220 if (pktopt && pktopt->ip6po_pktinfo) 2221 optdata = (void *)pktopt->ip6po_pktinfo; 2222 else { 2223 /* XXX: we don't have to do this every time... */ 2224 memset(&null_pktinfo, 0, sizeof(null_pktinfo)); 2225 optdata = (void *)&null_pktinfo; 2226 } 2227 optdatalen = sizeof(struct in6_pktinfo); 2228 break; 2229 case IPV6_OTCLASS: 2230 /* XXX */ 2231 return (EINVAL); 2232 case IPV6_TCLASS: 2233 if (pktopt && pktopt->ip6po_tclass >= 0) 2234 optdata = (void *)&pktopt->ip6po_tclass; 2235 else 2236 optdata = (void *)&deftclass; 2237 optdatalen = sizeof(int); 2238 break; 2239 case IPV6_HOPOPTS: 2240 if (pktopt && pktopt->ip6po_hbh) { 2241 optdata = (void *)pktopt->ip6po_hbh; 2242 ip6e = (struct ip6_ext *)pktopt->ip6po_hbh; 2243 optdatalen = (ip6e->ip6e_len + 1) << 3; 2244 } 2245 break; 2246 case IPV6_RTHDR: 2247 if (pktopt && pktopt->ip6po_rthdr) { 2248 optdata = (void *)pktopt->ip6po_rthdr; 2249 ip6e = (struct ip6_ext *)pktopt->ip6po_rthdr; 2250 optdatalen = (ip6e->ip6e_len + 1) << 3; 2251 } 2252 break; 2253 case IPV6_RTHDRDSTOPTS: 2254 if (pktopt && pktopt->ip6po_dest1) { 2255 optdata = (void *)pktopt->ip6po_dest1; 2256 ip6e = (struct ip6_ext *)pktopt->ip6po_dest1; 2257 optdatalen = (ip6e->ip6e_len + 1) << 3; 2258 } 2259 break; 2260 case IPV6_DSTOPTS: 2261 if (pktopt && pktopt->ip6po_dest2) { 2262 optdata = (void *)pktopt->ip6po_dest2; 2263 ip6e = (struct ip6_ext *)pktopt->ip6po_dest2; 2264 optdatalen = (ip6e->ip6e_len + 1) << 3; 2265 } 2266 break; 2267 case IPV6_NEXTHOP: 2268 if (pktopt && pktopt->ip6po_nexthop) { 2269 optdata = (void *)pktopt->ip6po_nexthop; 2270 optdatalen = pktopt->ip6po_nexthop->sa_len; 2271 } 2272 break; 2273 case IPV6_USE_MIN_MTU: 2274 if (pktopt) 2275 optdata = (void *)&pktopt->ip6po_minmtu; 2276 else 2277 optdata = (void *)&defminmtu; 2278 optdatalen = sizeof(int); 2279 break; 2280 case IPV6_DONTFRAG: 2281 if (pktopt && ((pktopt->ip6po_flags) & IP6PO_DONTFRAG)) 2282 on = 1; 2283 else 2284 on = 0; 2285 optdata = (void *)&on; 2286 optdatalen = sizeof(on); 2287 break; 2288 default: /* should not happen */ 2289 #ifdef DIAGNOSTIC 2290 panic("ip6_getpcbopt: unexpected option\n"); 2291 #endif 2292 return (ENOPROTOOPT); 2293 } 2294 2295 if (optdatalen > MCLBYTES) 2296 return (EMSGSIZE); /* XXX */ 2297 *mp = m = m_get(M_WAIT, MT_SOOPTS); 2298 if (optdatalen > MLEN) 2299 MCLGET(m, M_WAIT); 2300 m->m_len = optdatalen; 2301 if (optdatalen) 2302 memcpy(mtod(m, void *), optdata, optdatalen); 2303 2304 return (error); 2305 } 2306 2307 void 2308 ip6_clearpktopts(struct ip6_pktopts *pktopt, int optname) 2309 { 2310 if (optname == -1 || optname == IPV6_PKTINFO) { 2311 if (pktopt->ip6po_pktinfo) 2312 free(pktopt->ip6po_pktinfo, M_IP6OPT); 2313 pktopt->ip6po_pktinfo = NULL; 2314 } 2315 if (optname == -1 || optname == IPV6_HOPLIMIT) 2316 pktopt->ip6po_hlim = -1; 2317 if (optname == -1 || optname == IPV6_TCLASS) 2318 pktopt->ip6po_tclass = -1; 2319 if (optname == -1 || optname == IPV6_NEXTHOP) { 2320 if (pktopt->ip6po_nextroute.ro_rt) { 2321 RTFREE(pktopt->ip6po_nextroute.ro_rt); 2322 pktopt->ip6po_nextroute.ro_rt = NULL; 2323 } 2324 if (pktopt->ip6po_nexthop) 2325 free(pktopt->ip6po_nexthop, M_IP6OPT); 2326 pktopt->ip6po_nexthop = NULL; 2327 } 2328 if (optname == -1 || optname == IPV6_HOPOPTS) { 2329 if (pktopt->ip6po_hbh) 2330 free(pktopt->ip6po_hbh, M_IP6OPT); 2331 pktopt->ip6po_hbh = NULL; 2332 } 2333 if (optname == -1 || optname == IPV6_RTHDRDSTOPTS) { 2334 if (pktopt->ip6po_dest1) 2335 free(pktopt->ip6po_dest1, M_IP6OPT); 2336 pktopt->ip6po_dest1 = NULL; 2337 } 2338 if (optname == -1 || optname == IPV6_RTHDR) { 2339 if (pktopt->ip6po_rhinfo.ip6po_rhi_rthdr) 2340 free(pktopt->ip6po_rhinfo.ip6po_rhi_rthdr, M_IP6OPT); 2341 pktopt->ip6po_rhinfo.ip6po_rhi_rthdr = NULL; 2342 if (pktopt->ip6po_route.ro_rt) { 2343 RTFREE(pktopt->ip6po_route.ro_rt); 2344 pktopt->ip6po_route.ro_rt = NULL; 2345 } 2346 } 2347 if (optname == -1 || optname == IPV6_DSTOPTS) { 2348 if (pktopt->ip6po_dest2) 2349 free(pktopt->ip6po_dest2, M_IP6OPT); 2350 pktopt->ip6po_dest2 = NULL; 2351 } 2352 } 2353 2354 #define PKTOPT_EXTHDRCPY(type) \ 2355 do { \ 2356 if (src->type) { \ 2357 int hlen = (((struct ip6_ext *)src->type)->ip6e_len + 1) << 3;\ 2358 dst->type = malloc(hlen, M_IP6OPT, canwait); \ 2359 if (dst->type == NULL && canwait == M_NOWAIT) \ 2360 goto bad; \ 2361 memcpy(dst->type, src->type, hlen); \ 2362 } \ 2363 } while (/*CONSTCOND*/ 0) 2364 2365 static int 2366 copypktopts(struct ip6_pktopts *dst, struct ip6_pktopts *src, int canwait) 2367 { 2368 dst->ip6po_hlim = src->ip6po_hlim; 2369 dst->ip6po_tclass = src->ip6po_tclass; 2370 dst->ip6po_flags = src->ip6po_flags; 2371 if (src->ip6po_pktinfo) { 2372 dst->ip6po_pktinfo = malloc(sizeof(*dst->ip6po_pktinfo), 2373 M_IP6OPT, canwait); 2374 if (dst->ip6po_pktinfo == NULL && canwait == M_NOWAIT) 2375 goto bad; 2376 *dst->ip6po_pktinfo = *src->ip6po_pktinfo; 2377 } 2378 if (src->ip6po_nexthop) { 2379 dst->ip6po_nexthop = malloc(src->ip6po_nexthop->sa_len, 2380 M_IP6OPT, canwait); 2381 if (dst->ip6po_nexthop == NULL && canwait == M_NOWAIT) 2382 goto bad; 2383 memcpy(dst->ip6po_nexthop, src->ip6po_nexthop, 2384 src->ip6po_nexthop->sa_len); 2385 } 2386 PKTOPT_EXTHDRCPY(ip6po_hbh); 2387 PKTOPT_EXTHDRCPY(ip6po_dest1); 2388 PKTOPT_EXTHDRCPY(ip6po_dest2); 2389 PKTOPT_EXTHDRCPY(ip6po_rthdr); /* not copy the cached route */ 2390 return (0); 2391 2392 bad: 2393 if (dst->ip6po_pktinfo) free(dst->ip6po_pktinfo, M_IP6OPT); 2394 if (dst->ip6po_nexthop) free(dst->ip6po_nexthop, M_IP6OPT); 2395 if (dst->ip6po_hbh) free(dst->ip6po_hbh, M_IP6OPT); 2396 if (dst->ip6po_dest1) free(dst->ip6po_dest1, M_IP6OPT); 2397 if (dst->ip6po_dest2) free(dst->ip6po_dest2, M_IP6OPT); 2398 if (dst->ip6po_rthdr) free(dst->ip6po_rthdr, M_IP6OPT); 2399 2400 return (ENOBUFS); 2401 } 2402 #undef PKTOPT_EXTHDRCPY 2403 2404 struct ip6_pktopts * 2405 ip6_copypktopts(struct ip6_pktopts *src, int canwait) 2406 { 2407 int error; 2408 struct ip6_pktopts *dst; 2409 2410 dst = malloc(sizeof(*dst), M_IP6OPT, canwait); 2411 if (dst == NULL && canwait == M_NOWAIT) 2412 return (NULL); 2413 ip6_initpktopts(dst); 2414 2415 if ((error = copypktopts(dst, src, canwait)) != 0) { 2416 free(dst, M_IP6OPT); 2417 return (NULL); 2418 } 2419 2420 return (dst); 2421 } 2422 2423 void 2424 ip6_freepcbopts(struct ip6_pktopts *pktopt) 2425 { 2426 if (pktopt == NULL) 2427 return; 2428 2429 ip6_clearpktopts(pktopt, -1); 2430 2431 free(pktopt, M_IP6OPT); 2432 } 2433 2434 /* 2435 * Set the IP6 multicast options in response to user setsockopt(). 2436 */ 2437 static int 2438 ip6_setmoptions(optname, im6op, m) 2439 int optname; 2440 struct ip6_moptions **im6op; 2441 struct mbuf *m; 2442 { 2443 int error = 0; 2444 u_int loop, ifindex; 2445 struct ipv6_mreq *mreq; 2446 struct ifnet *ifp; 2447 struct ip6_moptions *im6o = *im6op; 2448 struct route_in6 ro; 2449 struct in6_multi_mship *imm; 2450 struct proc *p = curproc; /* XXX */ 2451 2452 if (im6o == NULL) { 2453 /* 2454 * No multicast option buffer attached to the pcb; 2455 * allocate one and initialize to default values. 2456 */ 2457 im6o = (struct ip6_moptions *) 2458 malloc(sizeof(*im6o), M_IPMOPTS, M_WAITOK); 2459 2460 if (im6o == NULL) 2461 return (ENOBUFS); 2462 *im6op = im6o; 2463 im6o->im6o_multicast_ifp = NULL; 2464 im6o->im6o_multicast_hlim = ip6_defmcasthlim; 2465 im6o->im6o_multicast_loop = IPV6_DEFAULT_MULTICAST_LOOP; 2466 LIST_INIT(&im6o->im6o_memberships); 2467 } 2468 2469 switch (optname) { 2470 2471 case IPV6_MULTICAST_IF: 2472 /* 2473 * Select the interface for outgoing multicast packets. 2474 */ 2475 if (m == NULL || m->m_len != sizeof(u_int)) { 2476 error = EINVAL; 2477 break; 2478 } 2479 bcopy(mtod(m, u_int *), &ifindex, sizeof(ifindex)); 2480 if (ifindex != 0) { 2481 if (ifindex < 0 || if_indexlim <= ifindex || 2482 !ifindex2ifnet[ifindex]) { 2483 error = ENXIO; /* XXX EINVAL? */ 2484 break; 2485 } 2486 ifp = ifindex2ifnet[ifindex]; 2487 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 2488 error = EADDRNOTAVAIL; 2489 break; 2490 } 2491 } else 2492 ifp = NULL; 2493 im6o->im6o_multicast_ifp = ifp; 2494 break; 2495 2496 case IPV6_MULTICAST_HOPS: 2497 { 2498 /* 2499 * Set the IP6 hoplimit for outgoing multicast packets. 2500 */ 2501 int optval; 2502 if (m == NULL || m->m_len != sizeof(int)) { 2503 error = EINVAL; 2504 break; 2505 } 2506 bcopy(mtod(m, u_int *), &optval, sizeof(optval)); 2507 if (optval < -1 || optval >= 256) 2508 error = EINVAL; 2509 else if (optval == -1) 2510 im6o->im6o_multicast_hlim = ip6_defmcasthlim; 2511 else 2512 im6o->im6o_multicast_hlim = optval; 2513 break; 2514 } 2515 2516 case IPV6_MULTICAST_LOOP: 2517 /* 2518 * Set the loopback flag for outgoing multicast packets. 2519 * Must be zero or one. 2520 */ 2521 if (m == NULL || m->m_len != sizeof(u_int)) { 2522 error = EINVAL; 2523 break; 2524 } 2525 bcopy(mtod(m, u_int *), &loop, sizeof(loop)); 2526 if (loop > 1) { 2527 error = EINVAL; 2528 break; 2529 } 2530 im6o->im6o_multicast_loop = loop; 2531 break; 2532 2533 case IPV6_JOIN_GROUP: 2534 /* 2535 * Add a multicast group membership. 2536 * Group must be a valid IP6 multicast address. 2537 */ 2538 if (m == NULL || m->m_len != sizeof(struct ipv6_mreq)) { 2539 error = EINVAL; 2540 break; 2541 } 2542 mreq = mtod(m, struct ipv6_mreq *); 2543 if (IN6_IS_ADDR_UNSPECIFIED(&mreq->ipv6mr_multiaddr)) { 2544 /* 2545 * We use the unspecified address to specify to accept 2546 * all multicast addresses. Only super user is allowed 2547 * to do this. 2548 */ 2549 if (kauth_authorize_generic(p->p_cred, KAUTH_GENERIC_ISSUSER, &p->p_acflag)) 2550 { 2551 error = EACCES; 2552 break; 2553 } 2554 } else if (!IN6_IS_ADDR_MULTICAST(&mreq->ipv6mr_multiaddr)) { 2555 error = EINVAL; 2556 break; 2557 } 2558 2559 /* 2560 * If no interface was explicitly specified, choose an 2561 * appropriate one according to the given multicast address. 2562 */ 2563 if (mreq->ipv6mr_interface == 0) { 2564 struct sockaddr_in6 *dst; 2565 2566 /* 2567 * Look up the routing table for the 2568 * address, and choose the outgoing interface. 2569 * XXX: is it a good approach? 2570 */ 2571 ro.ro_rt = NULL; 2572 dst = (struct sockaddr_in6 *)&ro.ro_dst; 2573 bzero(dst, sizeof(*dst)); 2574 dst->sin6_family = AF_INET6; 2575 dst->sin6_len = sizeof(*dst); 2576 dst->sin6_addr = mreq->ipv6mr_multiaddr; 2577 rtalloc((struct route *)&ro); 2578 if (ro.ro_rt == NULL) { 2579 error = EADDRNOTAVAIL; 2580 break; 2581 } 2582 ifp = ro.ro_rt->rt_ifp; 2583 rtfree(ro.ro_rt); 2584 } else { 2585 /* 2586 * If the interface is specified, validate it. 2587 */ 2588 if (mreq->ipv6mr_interface < 0 || 2589 if_indexlim <= mreq->ipv6mr_interface || 2590 !ifindex2ifnet[mreq->ipv6mr_interface]) { 2591 error = ENXIO; /* XXX EINVAL? */ 2592 break; 2593 } 2594 ifp = ifindex2ifnet[mreq->ipv6mr_interface]; 2595 } 2596 2597 /* 2598 * See if we found an interface, and confirm that it 2599 * supports multicast 2600 */ 2601 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0) { 2602 error = EADDRNOTAVAIL; 2603 break; 2604 } 2605 2606 if (in6_setscope(&mreq->ipv6mr_multiaddr, ifp, NULL)) { 2607 error = EADDRNOTAVAIL; /* XXX: should not happen */ 2608 break; 2609 } 2610 2611 /* 2612 * See if the membership already exists. 2613 */ 2614 for (imm = im6o->im6o_memberships.lh_first; 2615 imm != NULL; imm = imm->i6mm_chain.le_next) 2616 if (imm->i6mm_maddr->in6m_ifp == ifp && 2617 IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr, 2618 &mreq->ipv6mr_multiaddr)) 2619 break; 2620 if (imm != NULL) { 2621 error = EADDRINUSE; 2622 break; 2623 } 2624 /* 2625 * Everything looks good; add a new record to the multicast 2626 * address list for the given interface. 2627 */ 2628 imm = in6_joingroup(ifp, &mreq->ipv6mr_multiaddr, &error, 0); 2629 if (imm == NULL) 2630 break; 2631 LIST_INSERT_HEAD(&im6o->im6o_memberships, imm, i6mm_chain); 2632 break; 2633 2634 case IPV6_LEAVE_GROUP: 2635 /* 2636 * Drop a multicast group membership. 2637 * Group must be a valid IP6 multicast address. 2638 */ 2639 if (m == NULL || m->m_len != sizeof(struct ipv6_mreq)) { 2640 error = EINVAL; 2641 break; 2642 } 2643 mreq = mtod(m, struct ipv6_mreq *); 2644 2645 /* 2646 * If an interface address was specified, get a pointer 2647 * to its ifnet structure. 2648 */ 2649 if (mreq->ipv6mr_interface != 0) { 2650 if (mreq->ipv6mr_interface < 0 || 2651 if_indexlim <= mreq->ipv6mr_interface || 2652 !ifindex2ifnet[mreq->ipv6mr_interface]) { 2653 error = ENXIO; /* XXX EINVAL? */ 2654 break; 2655 } 2656 ifp = ifindex2ifnet[mreq->ipv6mr_interface]; 2657 } else 2658 ifp = NULL; 2659 2660 /* Fill in the scope zone ID */ 2661 if (ifp) { 2662 if (in6_setscope(&mreq->ipv6mr_multiaddr, ifp, NULL)) { 2663 /* XXX: should not happen */ 2664 error = EADDRNOTAVAIL; 2665 break; 2666 } 2667 } else if (mreq->ipv6mr_interface != 0) { 2668 /* 2669 * XXX: This case would happens when the (positive) 2670 * index is in the valid range, but the corresponding 2671 * interface has been detached dynamically. The above 2672 * check probably avoids such case to happen here, but 2673 * we check it explicitly for safety. 2674 */ 2675 error = EADDRNOTAVAIL; 2676 break; 2677 } else { /* ipv6mr_interface == 0 */ 2678 struct sockaddr_in6 sa6_mc; 2679 2680 /* 2681 * The API spec says as follows: 2682 * If the interface index is specified as 0, the 2683 * system may choose a multicast group membership to 2684 * drop by matching the multicast address only. 2685 * On the other hand, we cannot disambiguate the scope 2686 * zone unless an interface is provided. Thus, we 2687 * check if there's ambiguity with the default scope 2688 * zone as the last resort. 2689 */ 2690 bzero(&sa6_mc, sizeof(sa6_mc)); 2691 sa6_mc.sin6_family = AF_INET6; 2692 sa6_mc.sin6_len = sizeof(sa6_mc); 2693 sa6_mc.sin6_addr = mreq->ipv6mr_multiaddr; 2694 error = sa6_embedscope(&sa6_mc, ip6_use_defzone); 2695 if (error != 0) 2696 break; 2697 mreq->ipv6mr_multiaddr = sa6_mc.sin6_addr; 2698 } 2699 2700 /* 2701 * Find the membership in the membership list. 2702 */ 2703 for (imm = im6o->im6o_memberships.lh_first; 2704 imm != NULL; imm = imm->i6mm_chain.le_next) { 2705 if ((ifp == NULL || imm->i6mm_maddr->in6m_ifp == ifp) && 2706 IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr, 2707 &mreq->ipv6mr_multiaddr)) 2708 break; 2709 } 2710 if (imm == NULL) { 2711 /* Unable to resolve interface */ 2712 error = EADDRNOTAVAIL; 2713 break; 2714 } 2715 /* 2716 * Give up the multicast address record to which the 2717 * membership points. 2718 */ 2719 LIST_REMOVE(imm, i6mm_chain); 2720 in6_leavegroup(imm); 2721 break; 2722 2723 default: 2724 error = EOPNOTSUPP; 2725 break; 2726 } 2727 2728 /* 2729 * If all options have default values, no need to keep the mbuf. 2730 */ 2731 if (im6o->im6o_multicast_ifp == NULL && 2732 im6o->im6o_multicast_hlim == ip6_defmcasthlim && 2733 im6o->im6o_multicast_loop == IPV6_DEFAULT_MULTICAST_LOOP && 2734 im6o->im6o_memberships.lh_first == NULL) { 2735 free(*im6op, M_IPMOPTS); 2736 *im6op = NULL; 2737 } 2738 2739 return (error); 2740 } 2741 2742 /* 2743 * Return the IP6 multicast options in response to user getsockopt(). 2744 */ 2745 static int 2746 ip6_getmoptions(optname, im6o, mp) 2747 int optname; 2748 struct ip6_moptions *im6o; 2749 struct mbuf **mp; 2750 { 2751 u_int *hlim, *loop, *ifindex; 2752 2753 *mp = m_get(M_WAIT, MT_SOOPTS); 2754 2755 switch (optname) { 2756 2757 case IPV6_MULTICAST_IF: 2758 ifindex = mtod(*mp, u_int *); 2759 (*mp)->m_len = sizeof(u_int); 2760 if (im6o == NULL || im6o->im6o_multicast_ifp == NULL) 2761 *ifindex = 0; 2762 else 2763 *ifindex = im6o->im6o_multicast_ifp->if_index; 2764 return (0); 2765 2766 case IPV6_MULTICAST_HOPS: 2767 hlim = mtod(*mp, u_int *); 2768 (*mp)->m_len = sizeof(u_int); 2769 if (im6o == NULL) 2770 *hlim = ip6_defmcasthlim; 2771 else 2772 *hlim = im6o->im6o_multicast_hlim; 2773 return (0); 2774 2775 case IPV6_MULTICAST_LOOP: 2776 loop = mtod(*mp, u_int *); 2777 (*mp)->m_len = sizeof(u_int); 2778 if (im6o == NULL) 2779 *loop = ip6_defmcasthlim; 2780 else 2781 *loop = im6o->im6o_multicast_loop; 2782 return (0); 2783 2784 default: 2785 return (EOPNOTSUPP); 2786 } 2787 } 2788 2789 /* 2790 * Discard the IP6 multicast options. 2791 */ 2792 void 2793 ip6_freemoptions(im6o) 2794 struct ip6_moptions *im6o; 2795 { 2796 struct in6_multi_mship *imm; 2797 2798 if (im6o == NULL) 2799 return; 2800 2801 while ((imm = im6o->im6o_memberships.lh_first) != NULL) { 2802 LIST_REMOVE(imm, i6mm_chain); 2803 in6_leavegroup(imm); 2804 } 2805 free(im6o, M_IPMOPTS); 2806 } 2807 2808 /* 2809 * Set IPv6 outgoing packet options based on advanced API. 2810 */ 2811 int 2812 ip6_setpktopts(control, opt, stickyopt, priv, uproto) 2813 struct mbuf *control; 2814 struct ip6_pktopts *opt, *stickyopt; 2815 int priv, uproto; 2816 { 2817 struct cmsghdr *cm = 0; 2818 2819 if (control == NULL || opt == NULL) 2820 return (EINVAL); 2821 2822 ip6_initpktopts(opt); 2823 if (stickyopt) { 2824 int error; 2825 2826 /* 2827 * If stickyopt is provided, make a local copy of the options 2828 * for this particular packet, then override them by ancillary 2829 * objects. 2830 * XXX: copypktopts() does not copy the cached route to a next 2831 * hop (if any). This is not very good in terms of efficiency, 2832 * but we can allow this since this option should be rarely 2833 * used. 2834 */ 2835 if ((error = copypktopts(opt, stickyopt, M_NOWAIT)) != 0) 2836 return (error); 2837 } 2838 2839 /* 2840 * XXX: Currently, we assume all the optional information is stored 2841 * in a single mbuf. 2842 */ 2843 if (control->m_next) 2844 return (EINVAL); 2845 2846 for (; control->m_len; control->m_data += CMSG_ALIGN(cm->cmsg_len), 2847 control->m_len -= CMSG_ALIGN(cm->cmsg_len)) { 2848 int error; 2849 2850 if (control->m_len < CMSG_LEN(0)) 2851 return (EINVAL); 2852 2853 cm = mtod(control, struct cmsghdr *); 2854 if (cm->cmsg_len == 0 || cm->cmsg_len > control->m_len) 2855 return (EINVAL); 2856 if (cm->cmsg_level != IPPROTO_IPV6) 2857 continue; 2858 2859 error = ip6_setpktopt(cm->cmsg_type, CMSG_DATA(cm), 2860 cm->cmsg_len - CMSG_LEN(0), opt, priv, 0, 1, uproto); 2861 if (error) 2862 return (error); 2863 } 2864 2865 return (0); 2866 } 2867 2868 /* 2869 * Set a particular packet option, as a sticky option or an ancillary data 2870 * item. "len" can be 0 only when it's a sticky option. 2871 * We have 4 cases of combination of "sticky" and "cmsg": 2872 * "sticky=0, cmsg=0": impossible 2873 * "sticky=0, cmsg=1": RFC2292 or RFC3542 ancillary data 2874 * "sticky=1, cmsg=0": RFC3542 socket option 2875 * "sticky=1, cmsg=1": RFC2292 socket option 2876 */ 2877 static int 2878 ip6_setpktopt(int optname, u_char *buf, int len, struct ip6_pktopts *opt, 2879 int priv, int sticky, int cmsg, int uproto) 2880 { 2881 int minmtupolicy; 2882 2883 if (!sticky && !cmsg) { 2884 #ifdef DIAGNOSTIC 2885 printf("ip6_setpktopt: impossible case\n"); 2886 #endif 2887 return (EINVAL); 2888 } 2889 2890 /* 2891 * IPV6_2292xxx is for backward compatibility to RFC2292, and should 2892 * not be specified in the context of RFC3542. Conversely, 2893 * RFC3542 types should not be specified in the context of RFC2292. 2894 */ 2895 if (!cmsg) { 2896 switch (optname) { 2897 case IPV6_2292PKTINFO: 2898 case IPV6_2292HOPLIMIT: 2899 case IPV6_2292NEXTHOP: 2900 case IPV6_2292HOPOPTS: 2901 case IPV6_2292DSTOPTS: 2902 case IPV6_2292RTHDR: 2903 case IPV6_2292PKTOPTIONS: 2904 return (ENOPROTOOPT); 2905 } 2906 } 2907 if (sticky && cmsg) { 2908 switch (optname) { 2909 case IPV6_PKTINFO: 2910 case IPV6_HOPLIMIT: 2911 case IPV6_NEXTHOP: 2912 case IPV6_HOPOPTS: 2913 case IPV6_DSTOPTS: 2914 case IPV6_RTHDRDSTOPTS: 2915 case IPV6_RTHDR: 2916 case IPV6_USE_MIN_MTU: 2917 case IPV6_DONTFRAG: 2918 case IPV6_OTCLASS: 2919 case IPV6_TCLASS: 2920 return (ENOPROTOOPT); 2921 } 2922 } 2923 2924 switch (optname) { 2925 #ifdef RFC2292 2926 case IPV6_2292PKTINFO: 2927 #endif 2928 case IPV6_PKTINFO: 2929 { 2930 struct ifnet *ifp = NULL; 2931 struct in6_pktinfo *pktinfo; 2932 2933 if (len != sizeof(struct in6_pktinfo)) 2934 return (EINVAL); 2935 2936 pktinfo = (struct in6_pktinfo *)buf; 2937 2938 /* 2939 * An application can clear any sticky IPV6_PKTINFO option by 2940 * doing a "regular" setsockopt with ipi6_addr being 2941 * in6addr_any and ipi6_ifindex being zero. 2942 * [RFC 3542, Section 6] 2943 */ 2944 if (optname == IPV6_PKTINFO && opt->ip6po_pktinfo && 2945 pktinfo->ipi6_ifindex == 0 && 2946 IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) { 2947 ip6_clearpktopts(opt, optname); 2948 break; 2949 } 2950 2951 if (uproto == IPPROTO_TCP && optname == IPV6_PKTINFO && 2952 sticky && !IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) { 2953 return (EINVAL); 2954 } 2955 2956 /* validate the interface index if specified. */ 2957 if (pktinfo->ipi6_ifindex >= if_indexlim || 2958 pktinfo->ipi6_ifindex < 0) { 2959 return (ENXIO); 2960 } 2961 if (pktinfo->ipi6_ifindex) { 2962 ifp = ifindex2ifnet[pktinfo->ipi6_ifindex]; 2963 if (ifp == NULL) 2964 return (ENXIO); 2965 } 2966 2967 /* 2968 * We store the address anyway, and let in6_selectsrc() 2969 * validate the specified address. This is because ipi6_addr 2970 * may not have enough information about its scope zone, and 2971 * we may need additional information (such as outgoing 2972 * interface or the scope zone of a destination address) to 2973 * disambiguate the scope. 2974 * XXX: the delay of the validation may confuse the 2975 * application when it is used as a sticky option. 2976 */ 2977 if (opt->ip6po_pktinfo == NULL) { 2978 opt->ip6po_pktinfo = malloc(sizeof(*pktinfo), 2979 M_IP6OPT, M_NOWAIT); 2980 if (opt->ip6po_pktinfo == NULL) 2981 return (ENOBUFS); 2982 } 2983 memcpy(opt->ip6po_pktinfo, pktinfo, sizeof(*pktinfo)); 2984 break; 2985 } 2986 2987 #ifdef RFC2292 2988 case IPV6_2292HOPLIMIT: 2989 #endif 2990 case IPV6_HOPLIMIT: 2991 { 2992 int *hlimp; 2993 2994 /* 2995 * RFC 3542 deprecated the usage of sticky IPV6_HOPLIMIT 2996 * to simplify the ordering among hoplimit options. 2997 */ 2998 if (optname == IPV6_HOPLIMIT && sticky) 2999 return (ENOPROTOOPT); 3000 3001 if (len != sizeof(int)) 3002 return (EINVAL); 3003 hlimp = (int *)buf; 3004 if (*hlimp < -1 || *hlimp > 255) 3005 return (EINVAL); 3006 3007 opt->ip6po_hlim = *hlimp; 3008 break; 3009 } 3010 3011 case IPV6_OTCLASS: 3012 if (len != sizeof(u_int8_t)) 3013 return (EINVAL); 3014 3015 opt->ip6po_tclass = *(u_int8_t *)buf; 3016 break; 3017 3018 case IPV6_TCLASS: 3019 { 3020 int tclass; 3021 3022 if (len != sizeof(int)) 3023 return (EINVAL); 3024 tclass = *(int *)buf; 3025 if (tclass < -1 || tclass > 255) 3026 return (EINVAL); 3027 3028 opt->ip6po_tclass = tclass; 3029 break; 3030 } 3031 3032 #ifdef RFC2292 3033 case IPV6_2292NEXTHOP: 3034 #endif 3035 case IPV6_NEXTHOP: 3036 if (!priv) 3037 return (EPERM); 3038 3039 if (len == 0) { /* just remove the option */ 3040 ip6_clearpktopts(opt, IPV6_NEXTHOP); 3041 break; 3042 } 3043 3044 /* check if cmsg_len is large enough for sa_len */ 3045 if (len < sizeof(struct sockaddr) || len < *buf) 3046 return (EINVAL); 3047 3048 switch (((struct sockaddr *)buf)->sa_family) { 3049 case AF_INET6: 3050 { 3051 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)buf; 3052 int error; 3053 3054 if (sa6->sin6_len != sizeof(struct sockaddr_in6)) 3055 return (EINVAL); 3056 3057 if (IN6_IS_ADDR_UNSPECIFIED(&sa6->sin6_addr) || 3058 IN6_IS_ADDR_MULTICAST(&sa6->sin6_addr)) { 3059 return (EINVAL); 3060 } 3061 if ((error = sa6_embedscope(sa6, ip6_use_defzone)) 3062 != 0) { 3063 return (error); 3064 } 3065 break; 3066 } 3067 case AF_LINK: /* eventually be supported? */ 3068 default: 3069 return (EAFNOSUPPORT); 3070 } 3071 3072 /* turn off the previous option, then set the new option. */ 3073 ip6_clearpktopts(opt, IPV6_NEXTHOP); 3074 opt->ip6po_nexthop = malloc(*buf, M_IP6OPT, M_NOWAIT); 3075 if (opt->ip6po_nexthop == NULL) 3076 return (ENOBUFS); 3077 memcpy(opt->ip6po_nexthop, buf, *buf); 3078 break; 3079 3080 #ifdef RFC2292 3081 case IPV6_2292HOPOPTS: 3082 #endif 3083 case IPV6_HOPOPTS: 3084 { 3085 struct ip6_hbh *hbh; 3086 int hbhlen; 3087 3088 /* 3089 * XXX: We don't allow a non-privileged user to set ANY HbH 3090 * options, since per-option restriction has too much 3091 * overhead. 3092 */ 3093 if (!priv) 3094 return (EPERM); 3095 3096 if (len == 0) { 3097 ip6_clearpktopts(opt, IPV6_HOPOPTS); 3098 break; /* just remove the option */ 3099 } 3100 3101 /* message length validation */ 3102 if (len < sizeof(struct ip6_hbh)) 3103 return (EINVAL); 3104 hbh = (struct ip6_hbh *)buf; 3105 hbhlen = (hbh->ip6h_len + 1) << 3; 3106 if (len != hbhlen) 3107 return (EINVAL); 3108 3109 /* turn off the previous option, then set the new option. */ 3110 ip6_clearpktopts(opt, IPV6_HOPOPTS); 3111 opt->ip6po_hbh = malloc(hbhlen, M_IP6OPT, M_NOWAIT); 3112 if (opt->ip6po_hbh == NULL) 3113 return (ENOBUFS); 3114 memcpy(opt->ip6po_hbh, hbh, hbhlen); 3115 3116 break; 3117 } 3118 3119 #ifdef RFC2292 3120 case IPV6_2292DSTOPTS: 3121 #endif 3122 case IPV6_DSTOPTS: 3123 case IPV6_RTHDRDSTOPTS: 3124 { 3125 struct ip6_dest *dest, **newdest = NULL; 3126 int destlen; 3127 3128 if (!priv) /* XXX: see the comment for IPV6_HOPOPTS */ 3129 return (EPERM); 3130 3131 if (len == 0) { 3132 ip6_clearpktopts(opt, optname); 3133 break; /* just remove the option */ 3134 } 3135 3136 /* message length validation */ 3137 if (len < sizeof(struct ip6_dest)) 3138 return (EINVAL); 3139 dest = (struct ip6_dest *)buf; 3140 destlen = (dest->ip6d_len + 1) << 3; 3141 if (len != destlen) 3142 return (EINVAL); 3143 /* 3144 * Determine the position that the destination options header 3145 * should be inserted; before or after the routing header. 3146 */ 3147 switch (optname) { 3148 case IPV6_2292DSTOPTS: 3149 /* 3150 * The old advanced API is ambiguous on this point. 3151 * Our approach is to determine the position based 3152 * according to the existence of a routing header. 3153 * Note, however, that this depends on the order of the 3154 * extension headers in the ancillary data; the 1st 3155 * part of the destination options header must appear 3156 * before the routing header in the ancillary data, 3157 * too. 3158 * RFC3542 solved the ambiguity by introducing 3159 * separate ancillary data or option types. 3160 */ 3161 if (opt->ip6po_rthdr == NULL) 3162 newdest = &opt->ip6po_dest1; 3163 else 3164 newdest = &opt->ip6po_dest2; 3165 break; 3166 case IPV6_RTHDRDSTOPTS: 3167 newdest = &opt->ip6po_dest1; 3168 break; 3169 case IPV6_DSTOPTS: 3170 newdest = &opt->ip6po_dest2; 3171 break; 3172 } 3173 3174 /* turn off the previous option, then set the new option. */ 3175 ip6_clearpktopts(opt, optname); 3176 *newdest = malloc(destlen, M_IP6OPT, M_NOWAIT); 3177 if (*newdest == NULL) 3178 return (ENOBUFS); 3179 memcpy(*newdest, dest, destlen); 3180 3181 break; 3182 } 3183 3184 #ifdef RFC2292 3185 case IPV6_2292RTHDR: 3186 #endif 3187 case IPV6_RTHDR: 3188 { 3189 struct ip6_rthdr *rth; 3190 int rthlen; 3191 3192 if (len == 0) { 3193 ip6_clearpktopts(opt, IPV6_RTHDR); 3194 break; /* just remove the option */ 3195 } 3196 3197 /* message length validation */ 3198 if (len < sizeof(struct ip6_rthdr)) 3199 return (EINVAL); 3200 rth = (struct ip6_rthdr *)buf; 3201 rthlen = (rth->ip6r_len + 1) << 3; 3202 if (len != rthlen) 3203 return (EINVAL); 3204 switch (rth->ip6r_type) { 3205 case IPV6_RTHDR_TYPE_0: 3206 if (rth->ip6r_len == 0) /* must contain one addr */ 3207 return (EINVAL); 3208 if (rth->ip6r_len % 2) /* length must be even */ 3209 return (EINVAL); 3210 if (rth->ip6r_len / 2 != rth->ip6r_segleft) 3211 return (EINVAL); 3212 break; 3213 default: 3214 return (EINVAL); /* not supported */ 3215 } 3216 /* turn off the previous option */ 3217 ip6_clearpktopts(opt, IPV6_RTHDR); 3218 opt->ip6po_rthdr = malloc(rthlen, M_IP6OPT, M_NOWAIT); 3219 if (opt->ip6po_rthdr == NULL) 3220 return (ENOBUFS); 3221 memcpy(opt->ip6po_rthdr, rth, rthlen); 3222 break; 3223 } 3224 3225 case IPV6_USE_MIN_MTU: 3226 if (len != sizeof(int)) 3227 return (EINVAL); 3228 minmtupolicy = *(int *)buf; 3229 if (minmtupolicy != IP6PO_MINMTU_MCASTONLY && 3230 minmtupolicy != IP6PO_MINMTU_DISABLE && 3231 minmtupolicy != IP6PO_MINMTU_ALL) { 3232 return (EINVAL); 3233 } 3234 opt->ip6po_minmtu = minmtupolicy; 3235 break; 3236 3237 case IPV6_DONTFRAG: 3238 if (len != sizeof(int)) 3239 return (EINVAL); 3240 3241 if (uproto == IPPROTO_TCP || *(int *)buf == 0) { 3242 /* 3243 * we ignore this option for TCP sockets. 3244 * (RFC3542 leaves this case unspecified.) 3245 */ 3246 opt->ip6po_flags &= ~IP6PO_DONTFRAG; 3247 } else 3248 opt->ip6po_flags |= IP6PO_DONTFRAG; 3249 break; 3250 3251 default: 3252 return (ENOPROTOOPT); 3253 } /* end of switch */ 3254 3255 return (0); 3256 } 3257 3258 /* 3259 * Routine called from ip6_output() to loop back a copy of an IP6 multicast 3260 * packet to the input queue of a specified interface. Note that this 3261 * calls the output routine of the loopback "driver", but with an interface 3262 * pointer that might NOT be lo0ifp -- easier than replicating that code here. 3263 */ 3264 void 3265 ip6_mloopback(ifp, m, dst) 3266 struct ifnet *ifp; 3267 struct mbuf *m; 3268 struct sockaddr_in6 *dst; 3269 { 3270 struct mbuf *copym; 3271 struct ip6_hdr *ip6; 3272 3273 copym = m_copy(m, 0, M_COPYALL); 3274 if (copym == NULL) 3275 return; 3276 3277 /* 3278 * Make sure to deep-copy IPv6 header portion in case the data 3279 * is in an mbuf cluster, so that we can safely override the IPv6 3280 * header portion later. 3281 */ 3282 if ((copym->m_flags & M_EXT) != 0 || 3283 copym->m_len < sizeof(struct ip6_hdr)) { 3284 copym = m_pullup(copym, sizeof(struct ip6_hdr)); 3285 if (copym == NULL) 3286 return; 3287 } 3288 3289 #ifdef DIAGNOSTIC 3290 if (copym->m_len < sizeof(*ip6)) { 3291 m_freem(copym); 3292 return; 3293 } 3294 #endif 3295 3296 ip6 = mtod(copym, struct ip6_hdr *); 3297 /* 3298 * clear embedded scope identifiers if necessary. 3299 * in6_clearscope will touch the addresses only when necessary. 3300 */ 3301 in6_clearscope(&ip6->ip6_src); 3302 in6_clearscope(&ip6->ip6_dst); 3303 3304 (void)looutput(ifp, copym, (struct sockaddr *)dst, NULL); 3305 } 3306 3307 /* 3308 * Chop IPv6 header off from the payload. 3309 */ 3310 static int 3311 ip6_splithdr(m, exthdrs) 3312 struct mbuf *m; 3313 struct ip6_exthdrs *exthdrs; 3314 { 3315 struct mbuf *mh; 3316 struct ip6_hdr *ip6; 3317 3318 ip6 = mtod(m, struct ip6_hdr *); 3319 if (m->m_len > sizeof(*ip6)) { 3320 MGETHDR(mh, M_DONTWAIT, MT_HEADER); 3321 if (mh == 0) { 3322 m_freem(m); 3323 return ENOBUFS; 3324 } 3325 M_MOVE_PKTHDR(mh, m); 3326 MH_ALIGN(mh, sizeof(*ip6)); 3327 m->m_len -= sizeof(*ip6); 3328 m->m_data += sizeof(*ip6); 3329 mh->m_next = m; 3330 m = mh; 3331 m->m_len = sizeof(*ip6); 3332 bcopy((caddr_t)ip6, mtod(m, caddr_t), sizeof(*ip6)); 3333 } 3334 exthdrs->ip6e_ip6 = m; 3335 return 0; 3336 } 3337 3338 /* 3339 * Compute IPv6 extension header length. 3340 */ 3341 int 3342 ip6_optlen(in6p) 3343 struct in6pcb *in6p; 3344 { 3345 int len; 3346 3347 if (!in6p->in6p_outputopts) 3348 return 0; 3349 3350 len = 0; 3351 #define elen(x) \ 3352 (((struct ip6_ext *)(x)) ? (((struct ip6_ext *)(x))->ip6e_len + 1) << 3 : 0) 3353 3354 len += elen(in6p->in6p_outputopts->ip6po_hbh); 3355 len += elen(in6p->in6p_outputopts->ip6po_dest1); 3356 len += elen(in6p->in6p_outputopts->ip6po_rthdr); 3357 len += elen(in6p->in6p_outputopts->ip6po_dest2); 3358 return len; 3359 #undef elen 3360 } 3361
Indexes created Thu Sep 25 16:09:42 GMT 2025