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sys/netinet6/ip6_output.c
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1 /*- 2 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the project nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * $KAME: ip6_output.c,v 1.279 2002/01/26 06:12:30 jinmei Exp $ 30 */ 31 32 /*- 33 * Copyright (c) 1982, 1986, 1988, 1990, 1993 34 * The Regents of the University of California. All rights reserved. 35 * 36 * Redistribution and use in source and binary forms, with or without 37 * modification, are permitted provided that the following conditions 38 * are met: 39 * 1. Redistributions of source code must retain the above copyright 40 * notice, this list of conditions and the following disclaimer. 41 * 2. Redistributions in binary form must reproduce the above copyright 42 * notice, this list of conditions and the following disclaimer in the 43 * documentation and/or other materials provided with the distribution. 44 * 4. Neither the name of the University nor the names of its contributors 45 * may be used to endorse or promote products derived from this software 46 * without specific prior written permission. 47 * 48 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 49 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 50 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 51 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 52 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 53 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 54 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 55 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 56 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 57 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 58 * SUCH DAMAGE. 59 * 60 * @(#)ip_output.c 8.3 (Berkeley) 1/21/94 61 */ 62 63 #include <sys/cdefs.h> 64 __FBSDID("$FreeBSD: releng/8.4/sys/netinet6/ip6_output.c 239985 2012-09-01 10:39:01Z trociny $"); 65 66 #include "opt_inet.h" 67 #include "opt_inet6.h" 68 #include "opt_ipsec.h" 69 #include "opt_sctp.h" 70 71 #include <sys/param.h> 72 #include <sys/kernel.h> 73 #include <sys/malloc.h> 74 #include <sys/mbuf.h> 75 #include <sys/errno.h> 76 #include <sys/priv.h> 77 #include <sys/proc.h> 78 #include <sys/protosw.h> 79 #include <sys/socket.h> 80 #include <sys/socketvar.h> 81 #include <sys/syslog.h> 82 #include <sys/ucred.h> 83 84 #include <net/if.h> 85 #include <net/netisr.h> 86 #include <net/route.h> 87 #include <net/pfil.h> 88 #include <net/vnet.h> 89 90 #include <netinet/in.h> 91 #include <netinet/in_var.h> 92 #include <netinet6/in6_var.h> 93 #include <netinet/ip6.h> 94 #include <netinet/icmp6.h> 95 #include <netinet6/ip6_var.h> 96 #include <netinet/in_pcb.h> 97 #include <netinet/tcp_var.h> 98 #include <netinet6/nd6.h> 99 100 #ifdef IPSEC 101 #include <netipsec/ipsec.h> 102 #include <netipsec/ipsec6.h> 103 #include <netipsec/key.h> 104 #include <netinet6/ip6_ipsec.h> 105 #endif /* IPSEC */ 106 #ifdef SCTP 107 #include <netinet/sctp.h> 108 #include <netinet/sctp_crc32.h> 109 #endif 110 111 #include <netinet6/ip6protosw.h> 112 #include <netinet6/scope6_var.h> 113 114 extern int in6_mcast_loop; 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 struct ucred *, int)); 126 static int ip6_pcbopts __P((struct ip6_pktopts **, struct mbuf *, 127 struct socket *, struct sockopt *)); 128 static int ip6_getpcbopt(struct ip6_pktopts *, int, struct sockopt *); 129 static int ip6_setpktopt __P((int, u_char *, int, struct ip6_pktopts *, 130 struct ucred *, int, int, int)); 131 132 static int ip6_copyexthdr(struct mbuf **, caddr_t, int); 133 static int ip6_insertfraghdr __P((struct mbuf *, struct mbuf *, int, 134 struct ip6_frag **)); 135 static int ip6_insert_jumboopt(struct ip6_exthdrs *, u_int32_t); 136 static int ip6_splithdr(struct mbuf *, struct ip6_exthdrs *); 137 static int ip6_getpmtu __P((struct route_in6 *, struct route_in6 *, 138 struct ifnet *, struct in6_addr *, u_long *, int *, u_int)); 139 static int copypktopts(struct ip6_pktopts *, struct ip6_pktopts *, int); 140 141 142 /* 143 * Make an extension header from option data. hp is the source, and 144 * mp is the destination. 145 */ 146 #define MAKE_EXTHDR(hp, mp) \ 147 do { \ 148 if (hp) { \ 149 struct ip6_ext *eh = (struct ip6_ext *)(hp); \ 150 error = ip6_copyexthdr((mp), (caddr_t)(hp), \ 151 ((eh)->ip6e_len + 1) << 3); \ 152 if (error) \ 153 goto freehdrs; \ 154 } \ 155 } while (/*CONSTCOND*/ 0) 156 157 /* 158 * Form a chain of extension headers. 159 * m is the extension header mbuf 160 * mp is the previous mbuf in the chain 161 * p is the next header 162 * i is the type of option. 163 */ 164 #define MAKE_CHAIN(m, mp, p, i)\ 165 do {\ 166 if (m) {\ 167 if (!hdrsplit) \ 168 panic("assumption failed: hdr not split"); \ 169 *mtod((m), u_char *) = *(p);\ 170 *(p) = (i);\ 171 p = mtod((m), u_char *);\ 172 (m)->m_next = (mp)->m_next;\ 173 (mp)->m_next = (m);\ 174 (mp) = (m);\ 175 }\ 176 } while (/*CONSTCOND*/ 0) 177 178 /* 179 * IP6 output. The packet in mbuf chain m contains a skeletal IP6 180 * header (with pri, len, nxt, hlim, src, dst). 181 * This function may modify ver and hlim only. 182 * The mbuf chain containing the packet will be freed. 183 * The mbuf opt, if present, will not be freed. 184 * 185 * type of "mtu": rt_rmx.rmx_mtu is u_long, ifnet.ifr_mtu is int, and 186 * nd_ifinfo.linkmtu is u_int32_t. so we use u_long to hold largest one, 187 * which is rt_rmx.rmx_mtu. 188 * 189 * ifpp - XXX: just for statistics 190 */ 191 int 192 ip6_output(struct mbuf *m0, struct ip6_pktopts *opt, 193 struct route_in6 *ro, int flags, struct ip6_moptions *im6o, 194 struct ifnet **ifpp, struct inpcb *inp) 195 { 196 struct ip6_hdr *ip6, *mhip6; 197 struct ifnet *ifp, *origifp; 198 struct mbuf *m = m0; 199 struct mbuf *mprev = NULL; 200 int hlen, tlen, len, off; 201 struct route_in6 ip6route; 202 struct rtentry *rt = NULL; 203 struct sockaddr_in6 *dst, src_sa, dst_sa; 204 struct in6_addr odst; 205 int error = 0; 206 struct in6_ifaddr *ia = NULL; 207 u_long mtu; 208 int alwaysfrag, dontfrag; 209 u_int32_t optlen = 0, plen = 0, unfragpartlen = 0; 210 struct ip6_exthdrs exthdrs; 211 struct in6_addr finaldst, src0, dst0; 212 u_int32_t zone; 213 struct route_in6 *ro_pmtu = NULL; 214 int hdrsplit = 0; 215 int needipsec = 0; 216 #ifdef SCTP 217 int sw_csum; 218 #endif 219 #ifdef IPSEC 220 struct ipsec_output_state state; 221 struct ip6_rthdr *rh = NULL; 222 int needipsectun = 0; 223 int segleft_org = 0; 224 struct secpolicy *sp = NULL; 225 #endif /* IPSEC */ 226 227 ip6 = mtod(m, struct ip6_hdr *); 228 if (ip6 == NULL) { 229 printf ("ip6 is NULL"); 230 goto bad; 231 } 232 233 if (inp != NULL) 234 M_SETFIB(m, inp->inp_inc.inc_fibnum); 235 236 finaldst = ip6->ip6_dst; 237 238 bzero(&exthdrs, sizeof(exthdrs)); 239 240 if (opt) { 241 /* Hop-by-Hop options header */ 242 MAKE_EXTHDR(opt->ip6po_hbh, &exthdrs.ip6e_hbh); 243 /* Destination options header(1st part) */ 244 if (opt->ip6po_rthdr) { 245 /* 246 * Destination options header(1st part) 247 * This only makes sense with a routing header. 248 * See Section 9.2 of RFC 3542. 249 * Disabling this part just for MIP6 convenience is 250 * a bad idea. We need to think carefully about a 251 * way to make the advanced API coexist with MIP6 252 * options, which might automatically be inserted in 253 * the kernel. 254 */ 255 MAKE_EXTHDR(opt->ip6po_dest1, &exthdrs.ip6e_dest1); 256 } 257 /* Routing header */ 258 MAKE_EXTHDR(opt->ip6po_rthdr, &exthdrs.ip6e_rthdr); 259 /* Destination options header(2nd part) */ 260 MAKE_EXTHDR(opt->ip6po_dest2, &exthdrs.ip6e_dest2); 261 } 262 263 #ifdef IPSEC 264 /* 265 * IPSec checking which handles several cases. 266 * FAST IPSEC: We re-injected the packet. 267 */ 268 switch(ip6_ipsec_output(&m, inp, &flags, &error, &ifp, &sp)) 269 { 270 case 1: /* Bad packet */ 271 goto freehdrs; 272 case -1: /* Do IPSec */ 273 needipsec = 1; 274 case 0: /* No IPSec */ 275 default: 276 break; 277 } 278 #endif /* IPSEC */ 279 280 /* 281 * Calculate the total length of the extension header chain. 282 * Keep the length of the unfragmentable part for fragmentation. 283 */ 284 optlen = 0; 285 if (exthdrs.ip6e_hbh) 286 optlen += exthdrs.ip6e_hbh->m_len; 287 if (exthdrs.ip6e_dest1) 288 optlen += exthdrs.ip6e_dest1->m_len; 289 if (exthdrs.ip6e_rthdr) 290 optlen += exthdrs.ip6e_rthdr->m_len; 291 unfragpartlen = optlen + sizeof(struct ip6_hdr); 292 293 /* NOTE: we don't add AH/ESP length here. do that later. */ 294 if (exthdrs.ip6e_dest2) 295 optlen += exthdrs.ip6e_dest2->m_len; 296 297 /* 298 * If we need IPsec, or there is at least one extension header, 299 * separate IP6 header from the payload. 300 */ 301 if ((needipsec || optlen) && !hdrsplit) { 302 if ((error = ip6_splithdr(m, &exthdrs)) != 0) { 303 m = NULL; 304 goto freehdrs; 305 } 306 m = exthdrs.ip6e_ip6; 307 hdrsplit++; 308 } 309 310 /* adjust pointer */ 311 ip6 = mtod(m, struct ip6_hdr *); 312 313 /* adjust mbuf packet header length */ 314 m->m_pkthdr.len += optlen; 315 plen = m->m_pkthdr.len - sizeof(*ip6); 316 317 /* If this is a jumbo payload, insert a jumbo payload option. */ 318 if (plen > IPV6_MAXPACKET) { 319 if (!hdrsplit) { 320 if ((error = ip6_splithdr(m, &exthdrs)) != 0) { 321 m = NULL; 322 goto freehdrs; 323 } 324 m = exthdrs.ip6e_ip6; 325 hdrsplit++; 326 } 327 /* adjust pointer */ 328 ip6 = mtod(m, struct ip6_hdr *); 329 if ((error = ip6_insert_jumboopt(&exthdrs, plen)) != 0) 330 goto freehdrs; 331 ip6->ip6_plen = 0; 332 } else 333 ip6->ip6_plen = htons(plen); 334 335 /* 336 * Concatenate headers and fill in next header fields. 337 * Here we have, on "m" 338 * IPv6 payload 339 * and we insert headers accordingly. Finally, we should be getting: 340 * IPv6 hbh dest1 rthdr ah* [esp* dest2 payload] 341 * 342 * during the header composing process, "m" points to IPv6 header. 343 * "mprev" points to an extension header prior to esp. 344 */ 345 u_char *nexthdrp = &ip6->ip6_nxt; 346 mprev = m; 347 348 /* 349 * we treat dest2 specially. this makes IPsec processing 350 * much easier. the goal here is to make mprev point the 351 * mbuf prior to dest2. 352 * 353 * result: IPv6 dest2 payload 354 * m and mprev will point to IPv6 header. 355 */ 356 if (exthdrs.ip6e_dest2) { 357 if (!hdrsplit) 358 panic("assumption failed: hdr not split"); 359 exthdrs.ip6e_dest2->m_next = m->m_next; 360 m->m_next = exthdrs.ip6e_dest2; 361 *mtod(exthdrs.ip6e_dest2, u_char *) = ip6->ip6_nxt; 362 ip6->ip6_nxt = IPPROTO_DSTOPTS; 363 } 364 365 /* 366 * result: IPv6 hbh dest1 rthdr dest2 payload 367 * m will point to IPv6 header. mprev will point to the 368 * extension header prior to dest2 (rthdr in the above case). 369 */ 370 MAKE_CHAIN(exthdrs.ip6e_hbh, mprev, nexthdrp, IPPROTO_HOPOPTS); 371 MAKE_CHAIN(exthdrs.ip6e_dest1, mprev, nexthdrp, 372 IPPROTO_DSTOPTS); 373 MAKE_CHAIN(exthdrs.ip6e_rthdr, mprev, nexthdrp, 374 IPPROTO_ROUTING); 375 376 #ifdef IPSEC 377 if (!needipsec) 378 goto skip_ipsec2; 379 380 /* 381 * pointers after IPsec headers are not valid any more. 382 * other pointers need a great care too. 383 * (IPsec routines should not mangle mbufs prior to AH/ESP) 384 */ 385 exthdrs.ip6e_dest2 = NULL; 386 387 if (exthdrs.ip6e_rthdr) { 388 rh = mtod(exthdrs.ip6e_rthdr, struct ip6_rthdr *); 389 segleft_org = rh->ip6r_segleft; 390 rh->ip6r_segleft = 0; 391 } 392 393 bzero(&state, sizeof(state)); 394 state.m = m; 395 error = ipsec6_output_trans(&state, nexthdrp, mprev, sp, flags, 396 &needipsectun); 397 m = state.m; 398 if (error == EJUSTRETURN) { 399 /* 400 * We had a SP with a level of 'use' and no SA. We 401 * will just continue to process the packet without 402 * IPsec processing. 403 */ 404 ; 405 } else if (error) { 406 /* mbuf is already reclaimed in ipsec6_output_trans. */ 407 m = NULL; 408 switch (error) { 409 case EHOSTUNREACH: 410 case ENETUNREACH: 411 case EMSGSIZE: 412 case ENOBUFS: 413 case ENOMEM: 414 break; 415 default: 416 printf("[%s:%d] (ipsec): error code %d\n", 417 __func__, __LINE__, error); 418 /* FALLTHROUGH */ 419 case ENOENT: 420 /* don't show these error codes to the user */ 421 error = 0; 422 break; 423 } 424 goto bad; 425 } else if (!needipsectun) { 426 /* 427 * In the FAST IPSec case we have already 428 * re-injected the packet and it has been freed 429 * by the ipsec_done() function. So, just clean 430 * up after ourselves. 431 */ 432 m = NULL; 433 goto done; 434 } 435 if (exthdrs.ip6e_rthdr) { 436 /* ah6_output doesn't modify mbuf chain */ 437 rh->ip6r_segleft = segleft_org; 438 } 439 skip_ipsec2:; 440 #endif /* IPSEC */ 441 442 /* 443 * If there is a routing header, discard the packet. 444 */ 445 if (exthdrs.ip6e_rthdr) { 446 error = EINVAL; 447 goto bad; 448 } 449 450 /* Source address validation */ 451 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) && 452 (flags & IPV6_UNSPECSRC) == 0) { 453 error = EOPNOTSUPP; 454 V_ip6stat.ip6s_badscope++; 455 goto bad; 456 } 457 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src)) { 458 error = EOPNOTSUPP; 459 V_ip6stat.ip6s_badscope++; 460 goto bad; 461 } 462 463 V_ip6stat.ip6s_localout++; 464 465 /* 466 * Route packet. 467 */ 468 if (ro == 0) { 469 ro = &ip6route; 470 bzero((caddr_t)ro, sizeof(*ro)); 471 } 472 ro_pmtu = ro; 473 if (opt && opt->ip6po_rthdr) 474 ro = &opt->ip6po_route; 475 dst = (struct sockaddr_in6 *)&ro->ro_dst; 476 477 again: 478 /* 479 * if specified, try to fill in the traffic class field. 480 * do not override if a non-zero value is already set. 481 * we check the diffserv field and the ecn field separately. 482 */ 483 if (opt && opt->ip6po_tclass >= 0) { 484 int mask = 0; 485 486 if ((ip6->ip6_flow & htonl(0xfc << 20)) == 0) 487 mask |= 0xfc; 488 if ((ip6->ip6_flow & htonl(0x03 << 20)) == 0) 489 mask |= 0x03; 490 if (mask != 0) 491 ip6->ip6_flow |= htonl((opt->ip6po_tclass & mask) << 20); 492 } 493 494 /* fill in or override the hop limit field, if necessary. */ 495 if (opt && opt->ip6po_hlim != -1) 496 ip6->ip6_hlim = opt->ip6po_hlim & 0xff; 497 else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 498 if (im6o != NULL) 499 ip6->ip6_hlim = im6o->im6o_multicast_hlim; 500 else 501 ip6->ip6_hlim = V_ip6_defmcasthlim; 502 } 503 504 #ifdef IPSEC 505 /* 506 * We may re-inject packets into the stack here. 507 */ 508 if (needipsec && needipsectun) { 509 struct ipsec_output_state state; 510 511 /* 512 * All the extension headers will become inaccessible 513 * (since they can be encrypted). 514 * Don't panic, we need no more updates to extension headers 515 * on inner IPv6 packet (since they are now encapsulated). 516 * 517 * IPv6 [ESP|AH] IPv6 [extension headers] payload 518 */ 519 bzero(&exthdrs, sizeof(exthdrs)); 520 exthdrs.ip6e_ip6 = m; 521 522 bzero(&state, sizeof(state)); 523 state.m = m; 524 state.ro = (struct route *)ro; 525 state.dst = (struct sockaddr *)dst; 526 527 error = ipsec6_output_tunnel(&state, sp, flags); 528 529 m = state.m; 530 ro = (struct route_in6 *)state.ro; 531 dst = (struct sockaddr_in6 *)state.dst; 532 if (error == EJUSTRETURN) { 533 /* 534 * We had a SP with a level of 'use' and no SA. We 535 * will just continue to process the packet without 536 * IPsec processing. 537 */ 538 ; 539 } else if (error) { 540 /* mbuf is already reclaimed in ipsec6_output_tunnel. */ 541 m0 = m = NULL; 542 m = NULL; 543 switch (error) { 544 case EHOSTUNREACH: 545 case ENETUNREACH: 546 case EMSGSIZE: 547 case ENOBUFS: 548 case ENOMEM: 549 break; 550 default: 551 printf("[%s:%d] (ipsec): error code %d\n", 552 __func__, __LINE__, error); 553 /* FALLTHROUGH */ 554 case ENOENT: 555 /* don't show these error codes to the user */ 556 error = 0; 557 break; 558 } 559 goto bad; 560 } else { 561 /* 562 * In the FAST IPSec case we have already 563 * re-injected the packet and it has been freed 564 * by the ipsec_done() function. So, just clean 565 * up after ourselves. 566 */ 567 m = NULL; 568 goto done; 569 } 570 571 exthdrs.ip6e_ip6 = m; 572 } 573 #endif /* IPSEC */ 574 575 /* adjust pointer */ 576 ip6 = mtod(m, struct ip6_hdr *); 577 578 bzero(&dst_sa, sizeof(dst_sa)); 579 dst_sa.sin6_family = AF_INET6; 580 dst_sa.sin6_len = sizeof(dst_sa); 581 dst_sa.sin6_addr = ip6->ip6_dst; 582 if ((error = in6_selectroute_fib(&dst_sa, opt, im6o, ro, 583 &ifp, &rt, inp ? inp->inp_inc.inc_fibnum : M_GETFIB(m))) != 0) { 584 switch (error) { 585 case EHOSTUNREACH: 586 V_ip6stat.ip6s_noroute++; 587 break; 588 case EADDRNOTAVAIL: 589 default: 590 break; /* XXX statistics? */ 591 } 592 if (ifp != NULL) 593 in6_ifstat_inc(ifp, ifs6_out_discard); 594 goto bad; 595 } 596 if (rt == NULL) { 597 /* 598 * If in6_selectroute() does not return a route entry, 599 * dst may not have been updated. 600 */ 601 *dst = dst_sa; /* XXX */ 602 } 603 604 /* 605 * then rt (for unicast) and ifp must be non-NULL valid values. 606 */ 607 if ((flags & IPV6_FORWARDING) == 0) { 608 /* XXX: the FORWARDING flag can be set for mrouting. */ 609 in6_ifstat_inc(ifp, ifs6_out_request); 610 } 611 if (rt != NULL) { 612 ia = (struct in6_ifaddr *)(rt->rt_ifa); 613 rt->rt_use++; 614 } 615 616 617 /* 618 * The outgoing interface must be in the zone of source and 619 * destination addresses. 620 */ 621 origifp = ifp; 622 623 src0 = ip6->ip6_src; 624 if (in6_setscope(&src0, origifp, &zone)) 625 goto badscope; 626 bzero(&src_sa, sizeof(src_sa)); 627 src_sa.sin6_family = AF_INET6; 628 src_sa.sin6_len = sizeof(src_sa); 629 src_sa.sin6_addr = ip6->ip6_src; 630 if (sa6_recoverscope(&src_sa) || zone != src_sa.sin6_scope_id) 631 goto badscope; 632 633 dst0 = ip6->ip6_dst; 634 if (in6_setscope(&dst0, origifp, &zone)) 635 goto badscope; 636 /* re-initialize to be sure */ 637 bzero(&dst_sa, sizeof(dst_sa)); 638 dst_sa.sin6_family = AF_INET6; 639 dst_sa.sin6_len = sizeof(dst_sa); 640 dst_sa.sin6_addr = ip6->ip6_dst; 641 if (sa6_recoverscope(&dst_sa) || zone != dst_sa.sin6_scope_id) { 642 goto badscope; 643 } 644 645 /* We should use ia_ifp to support the case of 646 * sending packets to an address of our own. 647 */ 648 if (ia != NULL && ia->ia_ifp) 649 ifp = ia->ia_ifp; 650 651 /* scope check is done. */ 652 goto routefound; 653 654 badscope: 655 V_ip6stat.ip6s_badscope++; 656 in6_ifstat_inc(origifp, ifs6_out_discard); 657 if (error == 0) 658 error = EHOSTUNREACH; /* XXX */ 659 goto bad; 660 661 routefound: 662 if (rt && !IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 663 if (opt && opt->ip6po_nextroute.ro_rt) { 664 /* 665 * The nexthop is explicitly specified by the 666 * application. We assume the next hop is an IPv6 667 * address. 668 */ 669 dst = (struct sockaddr_in6 *)opt->ip6po_nexthop; 670 } 671 else if ((rt->rt_flags & RTF_GATEWAY)) 672 dst = (struct sockaddr_in6 *)rt->rt_gateway; 673 } 674 675 if (!IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 676 m->m_flags &= ~(M_BCAST | M_MCAST); /* just in case */ 677 } else { 678 m->m_flags = (m->m_flags & ~M_BCAST) | M_MCAST; 679 in6_ifstat_inc(ifp, ifs6_out_mcast); 680 /* 681 * Confirm that the outgoing interface supports multicast. 682 */ 683 if (!(ifp->if_flags & IFF_MULTICAST)) { 684 V_ip6stat.ip6s_noroute++; 685 in6_ifstat_inc(ifp, ifs6_out_discard); 686 error = ENETUNREACH; 687 goto bad; 688 } 689 if ((im6o == NULL && in6_mcast_loop) || 690 (im6o && im6o->im6o_multicast_loop)) { 691 /* 692 * Loop back multicast datagram if not expressly 693 * forbidden to do so, even if we have not joined 694 * the address; protocols will filter it later, 695 * thus deferring a hash lookup and lock acquisition 696 * at the expense of an m_copym(). 697 */ 698 ip6_mloopback(ifp, m, dst); 699 } else { 700 /* 701 * If we are acting as a multicast router, perform 702 * multicast forwarding as if the packet had just 703 * arrived on the interface to which we are about 704 * to send. The multicast forwarding function 705 * recursively calls this function, using the 706 * IPV6_FORWARDING flag to prevent infinite recursion. 707 * 708 * Multicasts that are looped back by ip6_mloopback(), 709 * above, will be forwarded by the ip6_input() routine, 710 * if necessary. 711 */ 712 if (V_ip6_mrouter && (flags & IPV6_FORWARDING) == 0) { 713 /* 714 * XXX: ip6_mforward expects that rcvif is NULL 715 * when it is called from the originating path. 716 * However, it is not always the case, since 717 * some versions of MGETHDR() does not 718 * initialize the field. 719 */ 720 m->m_pkthdr.rcvif = NULL; 721 if (ip6_mforward(ip6, ifp, m) != 0) { 722 m_freem(m); 723 goto done; 724 } 725 } 726 } 727 /* 728 * Multicasts with a hoplimit of zero may be looped back, 729 * above, but must not be transmitted on a network. 730 * Also, multicasts addressed to the loopback interface 731 * are not sent -- the above call to ip6_mloopback() will 732 * loop back a copy if this host actually belongs to the 733 * destination group on the loopback interface. 734 */ 735 if (ip6->ip6_hlim == 0 || (ifp->if_flags & IFF_LOOPBACK) || 736 IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst)) { 737 m_freem(m); 738 goto done; 739 } 740 } 741 742 /* 743 * Fill the outgoing inteface to tell the upper layer 744 * to increment per-interface statistics. 745 */ 746 if (ifpp) 747 *ifpp = ifp; 748 749 /* Determine path MTU. */ 750 if ((error = ip6_getpmtu(ro_pmtu, ro, ifp, &finaldst, &mtu, 751 &alwaysfrag, inp ? inp->inp_inc.inc_fibnum : M_GETFIB(m))) != 0) 752 goto bad; 753 754 /* 755 * The caller of this function may specify to use the minimum MTU 756 * in some cases. 757 * An advanced API option (IPV6_USE_MIN_MTU) can also override MTU 758 * setting. The logic is a bit complicated; by default, unicast 759 * packets will follow path MTU while multicast packets will be sent at 760 * the minimum MTU. If IP6PO_MINMTU_ALL is specified, all packets 761 * including unicast ones will be sent at the minimum MTU. Multicast 762 * packets will always be sent at the minimum MTU unless 763 * IP6PO_MINMTU_DISABLE is explicitly specified. 764 * See RFC 3542 for more details. 765 */ 766 if (mtu > IPV6_MMTU) { 767 if ((flags & IPV6_MINMTU)) 768 mtu = IPV6_MMTU; 769 else if (opt && opt->ip6po_minmtu == IP6PO_MINMTU_ALL) 770 mtu = IPV6_MMTU; 771 else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) && 772 (opt == NULL || 773 opt->ip6po_minmtu != IP6PO_MINMTU_DISABLE)) { 774 mtu = IPV6_MMTU; 775 } 776 } 777 778 /* 779 * clear embedded scope identifiers if necessary. 780 * in6_clearscope will touch the addresses only when necessary. 781 */ 782 in6_clearscope(&ip6->ip6_src); 783 in6_clearscope(&ip6->ip6_dst); 784 785 /* 786 * If the outgoing packet contains a hop-by-hop options header, 787 * it must be examined and processed even by the source node. 788 * (RFC 2460, section 4.) 789 */ 790 if (exthdrs.ip6e_hbh) { 791 struct ip6_hbh *hbh = mtod(exthdrs.ip6e_hbh, struct ip6_hbh *); 792 u_int32_t dummy; /* XXX unused */ 793 u_int32_t plen = 0; /* XXX: ip6_process will check the value */ 794 795 #ifdef DIAGNOSTIC 796 if ((hbh->ip6h_len + 1) << 3 > exthdrs.ip6e_hbh->m_len) 797 panic("ip6e_hbh is not continuous"); 798 #endif 799 /* 800 * XXX: if we have to send an ICMPv6 error to the sender, 801 * we need the M_LOOP flag since icmp6_error() expects 802 * the IPv6 and the hop-by-hop options header are 803 * continuous unless the flag is set. 804 */ 805 m->m_flags |= M_LOOP; 806 m->m_pkthdr.rcvif = ifp; 807 if (ip6_process_hopopts(m, (u_int8_t *)(hbh + 1), 808 ((hbh->ip6h_len + 1) << 3) - sizeof(struct ip6_hbh), 809 &dummy, &plen) < 0) { 810 /* m was already freed at this point */ 811 error = EINVAL;/* better error? */ 812 goto done; 813 } 814 m->m_flags &= ~M_LOOP; /* XXX */ 815 m->m_pkthdr.rcvif = NULL; 816 } 817 818 /* Jump over all PFIL processing if hooks are not active. */ 819 if (!PFIL_HOOKED(&V_inet6_pfil_hook)) 820 goto passout; 821 822 odst = ip6->ip6_dst; 823 /* Run through list of hooks for output packets. */ 824 error = pfil_run_hooks(&V_inet6_pfil_hook, &m, ifp, PFIL_OUT, inp); 825 if (error != 0 || m == NULL) 826 goto done; 827 ip6 = mtod(m, struct ip6_hdr *); 828 829 /* See if destination IP address was changed by packet filter. */ 830 if (!IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst)) { 831 m->m_flags |= M_SKIP_FIREWALL; 832 /* If destination is now ourself drop to ip6_input(). */ 833 if (in6_localaddr(&ip6->ip6_dst)) { 834 if (m->m_pkthdr.rcvif == NULL) 835 m->m_pkthdr.rcvif = V_loif; 836 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) { 837 m->m_pkthdr.csum_flags |= 838 CSUM_DATA_VALID | CSUM_PSEUDO_HDR; 839 m->m_pkthdr.csum_data = 0xffff; 840 } 841 m->m_pkthdr.csum_flags |= 842 CSUM_IP_CHECKED | CSUM_IP_VALID; 843 #ifdef SCTP 844 if (m->m_pkthdr.csum_flags & CSUM_SCTP) 845 m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID; 846 #endif 847 error = netisr_queue(NETISR_IPV6, m); 848 goto done; 849 } else 850 goto again; /* Redo the routing table lookup. */ 851 } 852 853 /* XXX: IPFIREWALL_FORWARD */ 854 855 passout: 856 /* 857 * Send the packet to the outgoing interface. 858 * If necessary, do IPv6 fragmentation before sending. 859 * 860 * the logic here is rather complex: 861 * 1: normal case (dontfrag == 0, alwaysfrag == 0) 862 * 1-a: send as is if tlen <= path mtu 863 * 1-b: fragment if tlen > path mtu 864 * 865 * 2: if user asks us not to fragment (dontfrag == 1) 866 * 2-a: send as is if tlen <= interface mtu 867 * 2-b: error if tlen > interface mtu 868 * 869 * 3: if we always need to attach fragment header (alwaysfrag == 1) 870 * always fragment 871 * 872 * 4: if dontfrag == 1 && alwaysfrag == 1 873 * error, as we cannot handle this conflicting request 874 */ 875 #ifdef SCTP 876 sw_csum = m->m_pkthdr.csum_flags & ~ifp->if_hwassist; 877 if (sw_csum & CSUM_SCTP) { 878 sctp_delayed_cksum(m, sizeof(struct ip6_hdr)); 879 sw_csum &= ~CSUM_SCTP; 880 } 881 #endif 882 tlen = m->m_pkthdr.len; 883 884 if (opt && (opt->ip6po_flags & IP6PO_DONTFRAG)) 885 dontfrag = 1; 886 else 887 dontfrag = 0; 888 if (dontfrag && alwaysfrag) { /* case 4 */ 889 /* conflicting request - can't transmit */ 890 error = EMSGSIZE; 891 goto bad; 892 } 893 if (dontfrag && tlen > IN6_LINKMTU(ifp)) { /* case 2-b */ 894 /* 895 * Even if the DONTFRAG option is specified, we cannot send the 896 * packet when the data length is larger than the MTU of the 897 * outgoing interface. 898 * Notify the error by sending IPV6_PATHMTU ancillary data as 899 * well as returning an error code (the latter is not described 900 * in the API spec.) 901 */ 902 u_int32_t mtu32; 903 struct ip6ctlparam ip6cp; 904 905 mtu32 = (u_int32_t)mtu; 906 bzero(&ip6cp, sizeof(ip6cp)); 907 ip6cp.ip6c_cmdarg = (void *)&mtu32; 908 pfctlinput2(PRC_MSGSIZE, (struct sockaddr *)&ro_pmtu->ro_dst, 909 (void *)&ip6cp); 910 911 error = EMSGSIZE; 912 goto bad; 913 } 914 915 /* 916 * transmit packet without fragmentation 917 */ 918 if (dontfrag || (!alwaysfrag && tlen <= mtu)) { /* case 1-a and 2-a */ 919 struct in6_ifaddr *ia6; 920 921 ip6 = mtod(m, struct ip6_hdr *); 922 ia6 = in6_ifawithifp(ifp, &ip6->ip6_src); 923 if (ia6) { 924 /* Record statistics for this interface address. */ 925 ia6->ia_ifa.if_opackets++; 926 ia6->ia_ifa.if_obytes += m->m_pkthdr.len; 927 ifa_free(&ia6->ia_ifa); 928 } 929 error = nd6_output(ifp, origifp, m, dst, ro->ro_rt); 930 goto done; 931 } 932 933 /* 934 * try to fragment the packet. case 1-b and 3 935 */ 936 if (mtu < IPV6_MMTU) { 937 /* path MTU cannot be less than IPV6_MMTU */ 938 error = EMSGSIZE; 939 in6_ifstat_inc(ifp, ifs6_out_fragfail); 940 goto bad; 941 } else if (ip6->ip6_plen == 0) { 942 /* jumbo payload cannot be fragmented */ 943 error = EMSGSIZE; 944 in6_ifstat_inc(ifp, ifs6_out_fragfail); 945 goto bad; 946 } else { 947 struct mbuf **mnext, *m_frgpart; 948 struct ip6_frag *ip6f; 949 u_int32_t id = htonl(ip6_randomid()); 950 u_char nextproto; 951 952 int qslots = ifp->if_snd.ifq_maxlen - ifp->if_snd.ifq_len; 953 954 /* 955 * Too large for the destination or interface; 956 * fragment if possible. 957 * Must be able to put at least 8 bytes per fragment. 958 */ 959 hlen = unfragpartlen; 960 if (mtu > IPV6_MAXPACKET) 961 mtu = IPV6_MAXPACKET; 962 963 len = (mtu - hlen - sizeof(struct ip6_frag)) & ~7; 964 if (len < 8) { 965 error = EMSGSIZE; 966 in6_ifstat_inc(ifp, ifs6_out_fragfail); 967 goto bad; 968 } 969 970 /* 971 * Verify that we have any chance at all of being able to queue 972 * the packet or packet fragments 973 */ 974 if (qslots <= 0 || ((u_int)qslots * (mtu - hlen) 975 < tlen /* - hlen */)) { 976 error = ENOBUFS; 977 V_ip6stat.ip6s_odropped++; 978 goto bad; 979 } 980 981 mnext = &m->m_nextpkt; 982 983 /* 984 * Change the next header field of the last header in the 985 * unfragmentable part. 986 */ 987 if (exthdrs.ip6e_rthdr) { 988 nextproto = *mtod(exthdrs.ip6e_rthdr, u_char *); 989 *mtod(exthdrs.ip6e_rthdr, u_char *) = IPPROTO_FRAGMENT; 990 } else if (exthdrs.ip6e_dest1) { 991 nextproto = *mtod(exthdrs.ip6e_dest1, u_char *); 992 *mtod(exthdrs.ip6e_dest1, u_char *) = IPPROTO_FRAGMENT; 993 } else if (exthdrs.ip6e_hbh) { 994 nextproto = *mtod(exthdrs.ip6e_hbh, u_char *); 995 *mtod(exthdrs.ip6e_hbh, u_char *) = IPPROTO_FRAGMENT; 996 } else { 997 nextproto = ip6->ip6_nxt; 998 ip6->ip6_nxt = IPPROTO_FRAGMENT; 999 } 1000 1001 /* 1002 * Loop through length of segment after first fragment, 1003 * make new header and copy data of each part and link onto 1004 * chain. 1005 */ 1006 m0 = m; 1007 for (off = hlen; off < tlen; off += len) { 1008 MGETHDR(m, M_DONTWAIT, MT_HEADER); 1009 if (!m) { 1010 error = ENOBUFS; 1011 V_ip6stat.ip6s_odropped++; 1012 goto sendorfree; 1013 } 1014 m->m_pkthdr.rcvif = NULL; 1015 m->m_flags = m0->m_flags & M_COPYFLAGS; /* incl. FIB */ 1016 *mnext = m; 1017 mnext = &m->m_nextpkt; 1018 m->m_data += max_linkhdr; 1019 mhip6 = mtod(m, struct ip6_hdr *); 1020 *mhip6 = *ip6; 1021 m->m_len = sizeof(*mhip6); 1022 error = ip6_insertfraghdr(m0, m, hlen, &ip6f); 1023 if (error) { 1024 V_ip6stat.ip6s_odropped++; 1025 goto sendorfree; 1026 } 1027 ip6f->ip6f_offlg = htons((u_short)((off - hlen) & ~7)); 1028 if (off + len >= tlen) 1029 len = tlen - off; 1030 else 1031 ip6f->ip6f_offlg |= IP6F_MORE_FRAG; 1032 mhip6->ip6_plen = htons((u_short)(len + hlen + 1033 sizeof(*ip6f) - sizeof(struct ip6_hdr))); 1034 if ((m_frgpart = m_copy(m0, off, len)) == 0) { 1035 error = ENOBUFS; 1036 V_ip6stat.ip6s_odropped++; 1037 goto sendorfree; 1038 } 1039 m_cat(m, m_frgpart); 1040 m->m_pkthdr.len = len + hlen + sizeof(*ip6f); 1041 m->m_pkthdr.rcvif = NULL; 1042 ip6f->ip6f_reserved = 0; 1043 ip6f->ip6f_ident = id; 1044 ip6f->ip6f_nxt = nextproto; 1045 V_ip6stat.ip6s_ofragments++; 1046 in6_ifstat_inc(ifp, ifs6_out_fragcreat); 1047 } 1048 1049 in6_ifstat_inc(ifp, ifs6_out_fragok); 1050 } 1051 1052 /* 1053 * Remove leading garbages. 1054 */ 1055 sendorfree: 1056 m = m0->m_nextpkt; 1057 m0->m_nextpkt = 0; 1058 m_freem(m0); 1059 for (m0 = m; m; m = m0) { 1060 m0 = m->m_nextpkt; 1061 m->m_nextpkt = 0; 1062 if (error == 0) { 1063 /* Record statistics for this interface address. */ 1064 if (ia) { 1065 ia->ia_ifa.if_opackets++; 1066 ia->ia_ifa.if_obytes += m->m_pkthdr.len; 1067 } 1068 error = nd6_output(ifp, origifp, m, dst, ro->ro_rt); 1069 } else 1070 m_freem(m); 1071 } 1072 1073 if (error == 0) 1074 V_ip6stat.ip6s_fragmented++; 1075 1076 done: 1077 if (ro == &ip6route && ro->ro_rt) { /* brace necessary for RTFREE */ 1078 RTFREE(ro->ro_rt); 1079 } else if (ro_pmtu == &ip6route && ro_pmtu->ro_rt) { 1080 RTFREE(ro_pmtu->ro_rt); 1081 } 1082 #ifdef IPSEC 1083 if (sp != NULL) 1084 KEY_FREESP(&sp); 1085 #endif 1086 1087 return (error); 1088 1089 freehdrs: 1090 m_freem(exthdrs.ip6e_hbh); /* m_freem will check if mbuf is 0 */ 1091 m_freem(exthdrs.ip6e_dest1); 1092 m_freem(exthdrs.ip6e_rthdr); 1093 m_freem(exthdrs.ip6e_dest2); 1094 /* FALLTHROUGH */ 1095 bad: 1096 if (m) 1097 m_freem(m); 1098 goto done; 1099 } 1100 1101 static int 1102 ip6_copyexthdr(struct mbuf **mp, caddr_t hdr, int hlen) 1103 { 1104 struct mbuf *m; 1105 1106 if (hlen > MCLBYTES) 1107 return (ENOBUFS); /* XXX */ 1108 1109 MGET(m, M_DONTWAIT, MT_DATA); 1110 if (!m) 1111 return (ENOBUFS); 1112 1113 if (hlen > MLEN) { 1114 MCLGET(m, M_DONTWAIT); 1115 if ((m->m_flags & M_EXT) == 0) { 1116 m_free(m); 1117 return (ENOBUFS); 1118 } 1119 } 1120 m->m_len = hlen; 1121 if (hdr) 1122 bcopy(hdr, mtod(m, caddr_t), hlen); 1123 1124 *mp = m; 1125 return (0); 1126 } 1127 1128 /* 1129 * Insert jumbo payload option. 1130 */ 1131 static int 1132 ip6_insert_jumboopt(struct ip6_exthdrs *exthdrs, u_int32_t plen) 1133 { 1134 struct mbuf *mopt; 1135 u_char *optbuf; 1136 u_int32_t v; 1137 1138 #define JUMBOOPTLEN 8 /* length of jumbo payload option and padding */ 1139 1140 /* 1141 * If there is no hop-by-hop options header, allocate new one. 1142 * If there is one but it doesn't have enough space to store the 1143 * jumbo payload option, allocate a cluster to store the whole options. 1144 * Otherwise, use it to store the options. 1145 */ 1146 if (exthdrs->ip6e_hbh == 0) { 1147 MGET(mopt, M_DONTWAIT, MT_DATA); 1148 if (mopt == 0) 1149 return (ENOBUFS); 1150 mopt->m_len = JUMBOOPTLEN; 1151 optbuf = mtod(mopt, u_char *); 1152 optbuf[1] = 0; /* = ((JUMBOOPTLEN) >> 3) - 1 */ 1153 exthdrs->ip6e_hbh = mopt; 1154 } else { 1155 struct ip6_hbh *hbh; 1156 1157 mopt = exthdrs->ip6e_hbh; 1158 if (M_TRAILINGSPACE(mopt) < JUMBOOPTLEN) { 1159 /* 1160 * XXX assumption: 1161 * - exthdrs->ip6e_hbh is not referenced from places 1162 * other than exthdrs. 1163 * - exthdrs->ip6e_hbh is not an mbuf chain. 1164 */ 1165 int oldoptlen = mopt->m_len; 1166 struct mbuf *n; 1167 1168 /* 1169 * XXX: give up if the whole (new) hbh header does 1170 * not fit even in an mbuf cluster. 1171 */ 1172 if (oldoptlen + JUMBOOPTLEN > MCLBYTES) 1173 return (ENOBUFS); 1174 1175 /* 1176 * As a consequence, we must always prepare a cluster 1177 * at this point. 1178 */ 1179 MGET(n, M_DONTWAIT, MT_DATA); 1180 if (n) { 1181 MCLGET(n, M_DONTWAIT); 1182 if ((n->m_flags & M_EXT) == 0) { 1183 m_freem(n); 1184 n = NULL; 1185 } 1186 } 1187 if (!n) 1188 return (ENOBUFS); 1189 n->m_len = oldoptlen + JUMBOOPTLEN; 1190 bcopy(mtod(mopt, caddr_t), mtod(n, caddr_t), 1191 oldoptlen); 1192 optbuf = mtod(n, caddr_t) + oldoptlen; 1193 m_freem(mopt); 1194 mopt = exthdrs->ip6e_hbh = n; 1195 } else { 1196 optbuf = mtod(mopt, u_char *) + mopt->m_len; 1197 mopt->m_len += JUMBOOPTLEN; 1198 } 1199 optbuf[0] = IP6OPT_PADN; 1200 optbuf[1] = 1; 1201 1202 /* 1203 * Adjust the header length according to the pad and 1204 * the jumbo payload option. 1205 */ 1206 hbh = mtod(mopt, struct ip6_hbh *); 1207 hbh->ip6h_len += (JUMBOOPTLEN >> 3); 1208 } 1209 1210 /* fill in the option. */ 1211 optbuf[2] = IP6OPT_JUMBO; 1212 optbuf[3] = 4; 1213 v = (u_int32_t)htonl(plen + JUMBOOPTLEN); 1214 bcopy(&v, &optbuf[4], sizeof(u_int32_t)); 1215 1216 /* finally, adjust the packet header length */ 1217 exthdrs->ip6e_ip6->m_pkthdr.len += JUMBOOPTLEN; 1218 1219 return (0); 1220 #undef JUMBOOPTLEN 1221 } 1222 1223 /* 1224 * Insert fragment header and copy unfragmentable header portions. 1225 */ 1226 static int 1227 ip6_insertfraghdr(struct mbuf *m0, struct mbuf *m, int hlen, 1228 struct ip6_frag **frghdrp) 1229 { 1230 struct mbuf *n, *mlast; 1231 1232 if (hlen > sizeof(struct ip6_hdr)) { 1233 n = m_copym(m0, sizeof(struct ip6_hdr), 1234 hlen - sizeof(struct ip6_hdr), M_DONTWAIT); 1235 if (n == 0) 1236 return (ENOBUFS); 1237 m->m_next = n; 1238 } else 1239 n = m; 1240 1241 /* Search for the last mbuf of unfragmentable part. */ 1242 for (mlast = n; mlast->m_next; mlast = mlast->m_next) 1243 ; 1244 1245 if ((mlast->m_flags & M_EXT) == 0 && 1246 M_TRAILINGSPACE(mlast) >= sizeof(struct ip6_frag)) { 1247 /* use the trailing space of the last mbuf for the fragment hdr */ 1248 *frghdrp = (struct ip6_frag *)(mtod(mlast, caddr_t) + 1249 mlast->m_len); 1250 mlast->m_len += sizeof(struct ip6_frag); 1251 m->m_pkthdr.len += sizeof(struct ip6_frag); 1252 } else { 1253 /* allocate a new mbuf for the fragment header */ 1254 struct mbuf *mfrg; 1255 1256 MGET(mfrg, M_DONTWAIT, MT_DATA); 1257 if (mfrg == 0) 1258 return (ENOBUFS); 1259 mfrg->m_len = sizeof(struct ip6_frag); 1260 *frghdrp = mtod(mfrg, struct ip6_frag *); 1261 mlast->m_next = mfrg; 1262 } 1263 1264 return (0); 1265 } 1266 1267 static int 1268 ip6_getpmtu(struct route_in6 *ro_pmtu, struct route_in6 *ro, 1269 struct ifnet *ifp, struct in6_addr *dst, u_long *mtup, 1270 int *alwaysfragp, u_int fibnum) 1271 { 1272 u_int32_t mtu = 0; 1273 int alwaysfrag = 0; 1274 int error = 0; 1275 1276 if (ro_pmtu != ro) { 1277 /* The first hop and the final destination may differ. */ 1278 struct sockaddr_in6 *sa6_dst = 1279 (struct sockaddr_in6 *)&ro_pmtu->ro_dst; 1280 if (ro_pmtu->ro_rt && 1281 ((ro_pmtu->ro_rt->rt_flags & RTF_UP) == 0 || 1282 !IN6_ARE_ADDR_EQUAL(&sa6_dst->sin6_addr, dst))) { 1283 RTFREE(ro_pmtu->ro_rt); 1284 ro_pmtu->ro_rt = (struct rtentry *)NULL; 1285 } 1286 if (ro_pmtu->ro_rt == NULL) { 1287 bzero(sa6_dst, sizeof(*sa6_dst)); 1288 sa6_dst->sin6_family = AF_INET6; 1289 sa6_dst->sin6_len = sizeof(struct sockaddr_in6); 1290 sa6_dst->sin6_addr = *dst; 1291 1292 in6_rtalloc(ro_pmtu, fibnum); 1293 } 1294 } 1295 if (ro_pmtu->ro_rt) { 1296 u_int32_t ifmtu; 1297 struct in_conninfo inc; 1298 1299 bzero(&inc, sizeof(inc)); 1300 inc.inc_flags |= INC_ISIPV6; 1301 inc.inc6_faddr = *dst; 1302 1303 if (ifp == NULL) 1304 ifp = ro_pmtu->ro_rt->rt_ifp; 1305 ifmtu = IN6_LINKMTU(ifp); 1306 mtu = tcp_hc_getmtu(&inc); 1307 if (mtu) 1308 mtu = min(mtu, ro_pmtu->ro_rt->rt_rmx.rmx_mtu); 1309 else 1310 mtu = ro_pmtu->ro_rt->rt_rmx.rmx_mtu; 1311 if (mtu == 0) 1312 mtu = ifmtu; 1313 else if (mtu < IPV6_MMTU) { 1314 /* 1315 * RFC2460 section 5, last paragraph: 1316 * if we record ICMPv6 too big message with 1317 * mtu < IPV6_MMTU, transmit packets sized IPV6_MMTU 1318 * or smaller, with framgent header attached. 1319 * (fragment header is needed regardless from the 1320 * packet size, for translators to identify packets) 1321 */ 1322 alwaysfrag = 1; 1323 mtu = IPV6_MMTU; 1324 } else if (mtu > ifmtu) { 1325 /* 1326 * The MTU on the route is larger than the MTU on 1327 * the interface! This shouldn't happen, unless the 1328 * MTU of the interface has been changed after the 1329 * interface was brought up. Change the MTU in the 1330 * route to match the interface MTU (as long as the 1331 * field isn't locked). 1332 */ 1333 mtu = ifmtu; 1334 ro_pmtu->ro_rt->rt_rmx.rmx_mtu = mtu; 1335 } 1336 } else if (ifp) { 1337 mtu = IN6_LINKMTU(ifp); 1338 } else 1339 error = EHOSTUNREACH; /* XXX */ 1340 1341 *mtup = mtu; 1342 if (alwaysfragp) 1343 *alwaysfragp = alwaysfrag; 1344 return (error); 1345 } 1346 1347 /* 1348 * IP6 socket option processing. 1349 */ 1350 int 1351 ip6_ctloutput(struct socket *so, struct sockopt *sopt) 1352 { 1353 int optdatalen, uproto; 1354 void *optdata; 1355 struct inpcb *in6p = sotoinpcb(so); 1356 int error, optval; 1357 int level, op, optname; 1358 int optlen; 1359 struct thread *td; 1360 1361 level = sopt->sopt_level; 1362 op = sopt->sopt_dir; 1363 optname = sopt->sopt_name; 1364 optlen = sopt->sopt_valsize; 1365 td = sopt->sopt_td; 1366 error = 0; 1367 optval = 0; 1368 uproto = (int)so->so_proto->pr_protocol; 1369 1370 if (level != IPPROTO_IPV6) { 1371 error = EINVAL; 1372 1373 if (sopt->sopt_level == SOL_SOCKET && 1374 sopt->sopt_dir == SOPT_SET) { 1375 switch (sopt->sopt_name) { 1376 case SO_SETFIB: 1377 INP_WLOCK(in6p); 1378 in6p->inp_inc.inc_fibnum = so->so_fibnum; 1379 INP_WUNLOCK(in6p); 1380 error = 0; 1381 break; 1382 default: 1383 break; 1384 } 1385 } 1386 } else { 1387 switch (op) { 1388 1389 case SOPT_SET: 1390 switch (optname) { 1391 case IPV6_2292PKTOPTIONS: 1392 #ifdef IPV6_PKTOPTIONS 1393 case IPV6_PKTOPTIONS: 1394 #endif 1395 { 1396 struct mbuf *m; 1397 1398 error = soopt_getm(sopt, &m); /* XXX */ 1399 if (error != 0) 1400 break; 1401 error = soopt_mcopyin(sopt, m); /* XXX */ 1402 if (error != 0) 1403 break; 1404 error = ip6_pcbopts(&in6p->in6p_outputopts, 1405 m, so, sopt); 1406 m_freem(m); /* XXX */ 1407 break; 1408 } 1409 1410 /* 1411 * Use of some Hop-by-Hop options or some 1412 * Destination options, might require special 1413 * privilege. That is, normal applications 1414 * (without special privilege) might be forbidden 1415 * from setting certain options in outgoing packets, 1416 * and might never see certain options in received 1417 * packets. [RFC 2292 Section 6] 1418 * KAME specific note: 1419 * KAME prevents non-privileged users from sending or 1420 * receiving ANY hbh/dst options in order to avoid 1421 * overhead of parsing options in the kernel. 1422 */ 1423 case IPV6_RECVHOPOPTS: 1424 case IPV6_RECVDSTOPTS: 1425 case IPV6_RECVRTHDRDSTOPTS: 1426 if (td != NULL) { 1427 error = priv_check(td, 1428 PRIV_NETINET_SETHDROPTS); 1429 if (error) 1430 break; 1431 } 1432 /* FALLTHROUGH */ 1433 case IPV6_UNICAST_HOPS: 1434 case IPV6_HOPLIMIT: 1435 case IPV6_FAITH: 1436 1437 case IPV6_RECVPKTINFO: 1438 case IPV6_RECVHOPLIMIT: 1439 case IPV6_RECVRTHDR: 1440 case IPV6_RECVPATHMTU: 1441 case IPV6_RECVTCLASS: 1442 case IPV6_V6ONLY: 1443 case IPV6_AUTOFLOWLABEL: 1444 case IPV6_BINDANY: 1445 if (optname == IPV6_BINDANY && td != NULL) { 1446 error = priv_check(td, 1447 PRIV_NETINET_BINDANY); 1448 if (error) 1449 break; 1450 } 1451 1452 if (optlen != sizeof(int)) { 1453 error = EINVAL; 1454 break; 1455 } 1456 error = sooptcopyin(sopt, &optval, 1457 sizeof optval, sizeof optval); 1458 if (error) 1459 break; 1460 switch (optname) { 1461 1462 case IPV6_UNICAST_HOPS: 1463 if (optval < -1 || optval >= 256) 1464 error = EINVAL; 1465 else { 1466 /* -1 = kernel default */ 1467 in6p->in6p_hops = optval; 1468 if ((in6p->inp_vflag & 1469 INP_IPV4) != 0) 1470 in6p->inp_ip_ttl = optval; 1471 } 1472 break; 1473 #define OPTSET(bit) \ 1474 do { \ 1475 INP_WLOCK(in6p); \ 1476 if (optval) \ 1477 in6p->inp_flags |= (bit); \ 1478 else \ 1479 in6p->inp_flags &= ~(bit); \ 1480 INP_WUNLOCK(in6p); \ 1481 } while (/*CONSTCOND*/ 0) 1482 #define OPTSET2292(bit) \ 1483 do { \ 1484 INP_WLOCK(in6p); \ 1485 in6p->inp_flags |= IN6P_RFC2292; \ 1486 if (optval) \ 1487 in6p->inp_flags |= (bit); \ 1488 else \ 1489 in6p->inp_flags &= ~(bit); \ 1490 INP_WUNLOCK(in6p); \ 1491 } while (/*CONSTCOND*/ 0) 1492 #define OPTBIT(bit) (in6p->inp_flags & (bit) ? 1 : 0) 1493 1494 case IPV6_RECVPKTINFO: 1495 /* cannot mix with RFC2292 */ 1496 if (OPTBIT(IN6P_RFC2292)) { 1497 error = EINVAL; 1498 break; 1499 } 1500 OPTSET(IN6P_PKTINFO); 1501 break; 1502 1503 case IPV6_HOPLIMIT: 1504 { 1505 struct ip6_pktopts **optp; 1506 1507 /* cannot mix with RFC2292 */ 1508 if (OPTBIT(IN6P_RFC2292)) { 1509 error = EINVAL; 1510 break; 1511 } 1512 optp = &in6p->in6p_outputopts; 1513 error = ip6_pcbopt(IPV6_HOPLIMIT, 1514 (u_char *)&optval, sizeof(optval), 1515 optp, (td != NULL) ? td->td_ucred : 1516 NULL, uproto); 1517 break; 1518 } 1519 1520 case IPV6_RECVHOPLIMIT: 1521 /* cannot mix with RFC2292 */ 1522 if (OPTBIT(IN6P_RFC2292)) { 1523 error = EINVAL; 1524 break; 1525 } 1526 OPTSET(IN6P_HOPLIMIT); 1527 break; 1528 1529 case IPV6_RECVHOPOPTS: 1530 /* cannot mix with RFC2292 */ 1531 if (OPTBIT(IN6P_RFC2292)) { 1532 error = EINVAL; 1533 break; 1534 } 1535 OPTSET(IN6P_HOPOPTS); 1536 break; 1537 1538 case IPV6_RECVDSTOPTS: 1539 /* cannot mix with RFC2292 */ 1540 if (OPTBIT(IN6P_RFC2292)) { 1541 error = EINVAL; 1542 break; 1543 } 1544 OPTSET(IN6P_DSTOPTS); 1545 break; 1546 1547 case IPV6_RECVRTHDRDSTOPTS: 1548 /* cannot mix with RFC2292 */ 1549 if (OPTBIT(IN6P_RFC2292)) { 1550 error = EINVAL; 1551 break; 1552 } 1553 OPTSET(IN6P_RTHDRDSTOPTS); 1554 break; 1555 1556 case IPV6_RECVRTHDR: 1557 /* cannot mix with RFC2292 */ 1558 if (OPTBIT(IN6P_RFC2292)) { 1559 error = EINVAL; 1560 break; 1561 } 1562 OPTSET(IN6P_RTHDR); 1563 break; 1564 1565 case IPV6_FAITH: 1566 OPTSET(INP_FAITH); 1567 break; 1568 1569 case IPV6_RECVPATHMTU: 1570 /* 1571 * We ignore this option for TCP 1572 * sockets. 1573 * (RFC3542 leaves this case 1574 * unspecified.) 1575 */ 1576 if (uproto != IPPROTO_TCP) 1577 OPTSET(IN6P_MTU); 1578 break; 1579 1580 case IPV6_V6ONLY: 1581 /* 1582 * make setsockopt(IPV6_V6ONLY) 1583 * available only prior to bind(2). 1584 * see ipng mailing list, Jun 22 2001. 1585 */ 1586 if (in6p->inp_lport || 1587 !IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) { 1588 error = EINVAL; 1589 break; 1590 } 1591 OPTSET(IN6P_IPV6_V6ONLY); 1592 if (optval) 1593 in6p->inp_vflag &= ~INP_IPV4; 1594 else 1595 in6p->inp_vflag |= INP_IPV4; 1596 break; 1597 case IPV6_RECVTCLASS: 1598 /* cannot mix with RFC2292 XXX */ 1599 if (OPTBIT(IN6P_RFC2292)) { 1600 error = EINVAL; 1601 break; 1602 } 1603 OPTSET(IN6P_TCLASS); 1604 break; 1605 case IPV6_AUTOFLOWLABEL: 1606 OPTSET(IN6P_AUTOFLOWLABEL); 1607 break; 1608 1609 case IPV6_BINDANY: 1610 OPTSET(INP_BINDANY); 1611 break; 1612 } 1613 break; 1614 1615 case IPV6_TCLASS: 1616 case IPV6_DONTFRAG: 1617 case IPV6_USE_MIN_MTU: 1618 case IPV6_PREFER_TEMPADDR: 1619 if (optlen != sizeof(optval)) { 1620 error = EINVAL; 1621 break; 1622 } 1623 error = sooptcopyin(sopt, &optval, 1624 sizeof optval, sizeof optval); 1625 if (error) 1626 break; 1627 { 1628 struct ip6_pktopts **optp; 1629 optp = &in6p->in6p_outputopts; 1630 error = ip6_pcbopt(optname, 1631 (u_char *)&optval, sizeof(optval), 1632 optp, (td != NULL) ? td->td_ucred : 1633 NULL, uproto); 1634 break; 1635 } 1636 1637 case IPV6_2292PKTINFO: 1638 case IPV6_2292HOPLIMIT: 1639 case IPV6_2292HOPOPTS: 1640 case IPV6_2292DSTOPTS: 1641 case IPV6_2292RTHDR: 1642 /* RFC 2292 */ 1643 if (optlen != sizeof(int)) { 1644 error = EINVAL; 1645 break; 1646 } 1647 error = sooptcopyin(sopt, &optval, 1648 sizeof optval, sizeof optval); 1649 if (error) 1650 break; 1651 switch (optname) { 1652 case IPV6_2292PKTINFO: 1653 OPTSET2292(IN6P_PKTINFO); 1654 break; 1655 case IPV6_2292HOPLIMIT: 1656 OPTSET2292(IN6P_HOPLIMIT); 1657 break; 1658 case IPV6_2292HOPOPTS: 1659 /* 1660 * Check super-user privilege. 1661 * See comments for IPV6_RECVHOPOPTS. 1662 */ 1663 if (td != NULL) { 1664 error = priv_check(td, 1665 PRIV_NETINET_SETHDROPTS); 1666 if (error) 1667 return (error); 1668 } 1669 OPTSET2292(IN6P_HOPOPTS); 1670 break; 1671 case IPV6_2292DSTOPTS: 1672 if (td != NULL) { 1673 error = priv_check(td, 1674 PRIV_NETINET_SETHDROPTS); 1675 if (error) 1676 return (error); 1677 } 1678 OPTSET2292(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); /* XXX */ 1679 break; 1680 case IPV6_2292RTHDR: 1681 OPTSET2292(IN6P_RTHDR); 1682 break; 1683 } 1684 break; 1685 case IPV6_PKTINFO: 1686 case IPV6_HOPOPTS: 1687 case IPV6_RTHDR: 1688 case IPV6_DSTOPTS: 1689 case IPV6_RTHDRDSTOPTS: 1690 case IPV6_NEXTHOP: 1691 { 1692 /* new advanced API (RFC3542) */ 1693 u_char *optbuf; 1694 u_char optbuf_storage[MCLBYTES]; 1695 int optlen; 1696 struct ip6_pktopts **optp; 1697 1698 /* cannot mix with RFC2292 */ 1699 if (OPTBIT(IN6P_RFC2292)) { 1700 error = EINVAL; 1701 break; 1702 } 1703 1704 /* 1705 * We only ensure valsize is not too large 1706 * here. Further validation will be done 1707 * later. 1708 */ 1709 error = sooptcopyin(sopt, optbuf_storage, 1710 sizeof(optbuf_storage), 0); 1711 if (error) 1712 break; 1713 optlen = sopt->sopt_valsize; 1714 optbuf = optbuf_storage; 1715 optp = &in6p->in6p_outputopts; 1716 error = ip6_pcbopt(optname, optbuf, optlen, 1717 optp, (td != NULL) ? td->td_ucred : NULL, 1718 uproto); 1719 break; 1720 } 1721 #undef OPTSET 1722 1723 case IPV6_MULTICAST_IF: 1724 case IPV6_MULTICAST_HOPS: 1725 case IPV6_MULTICAST_LOOP: 1726 case IPV6_JOIN_GROUP: 1727 case IPV6_LEAVE_GROUP: 1728 case IPV6_MSFILTER: 1729 case MCAST_BLOCK_SOURCE: 1730 case MCAST_UNBLOCK_SOURCE: 1731 case MCAST_JOIN_GROUP: 1732 case MCAST_LEAVE_GROUP: 1733 case MCAST_JOIN_SOURCE_GROUP: 1734 case MCAST_LEAVE_SOURCE_GROUP: 1735 error = ip6_setmoptions(in6p, sopt); 1736 break; 1737 1738 case IPV6_PORTRANGE: 1739 error = sooptcopyin(sopt, &optval, 1740 sizeof optval, sizeof optval); 1741 if (error) 1742 break; 1743 1744 INP_WLOCK(in6p); 1745 switch (optval) { 1746 case IPV6_PORTRANGE_DEFAULT: 1747 in6p->inp_flags &= ~(INP_LOWPORT); 1748 in6p->inp_flags &= ~(INP_HIGHPORT); 1749 break; 1750 1751 case IPV6_PORTRANGE_HIGH: 1752 in6p->inp_flags &= ~(INP_LOWPORT); 1753 in6p->inp_flags |= INP_HIGHPORT; 1754 break; 1755 1756 case IPV6_PORTRANGE_LOW: 1757 in6p->inp_flags &= ~(INP_HIGHPORT); 1758 in6p->inp_flags |= INP_LOWPORT; 1759 break; 1760 1761 default: 1762 error = EINVAL; 1763 break; 1764 } 1765 INP_WUNLOCK(in6p); 1766 break; 1767 1768 #ifdef IPSEC 1769 case IPV6_IPSEC_POLICY: 1770 { 1771 caddr_t req; 1772 struct mbuf *m; 1773 1774 if ((error = soopt_getm(sopt, &m)) != 0) /* XXX */ 1775 break; 1776 if ((error = soopt_mcopyin(sopt, m)) != 0) /* XXX */ 1777 break; 1778 req = mtod(m, caddr_t); 1779 error = ipsec_set_policy(in6p, optname, req, 1780 m->m_len, (sopt->sopt_td != NULL) ? 1781 sopt->sopt_td->td_ucred : NULL); 1782 m_freem(m); 1783 break; 1784 } 1785 #endif /* IPSEC */ 1786 1787 default: 1788 error = ENOPROTOOPT; 1789 break; 1790 } 1791 break; 1792 1793 case SOPT_GET: 1794 switch (optname) { 1795 1796 case IPV6_2292PKTOPTIONS: 1797 #ifdef IPV6_PKTOPTIONS 1798 case IPV6_PKTOPTIONS: 1799 #endif 1800 /* 1801 * RFC3542 (effectively) deprecated the 1802 * semantics of the 2292-style pktoptions. 1803 * Since it was not reliable in nature (i.e., 1804 * applications had to expect the lack of some 1805 * information after all), it would make sense 1806 * to simplify this part by always returning 1807 * empty data. 1808 */ 1809 sopt->sopt_valsize = 0; 1810 break; 1811 1812 case IPV6_RECVHOPOPTS: 1813 case IPV6_RECVDSTOPTS: 1814 case IPV6_RECVRTHDRDSTOPTS: 1815 case IPV6_UNICAST_HOPS: 1816 case IPV6_RECVPKTINFO: 1817 case IPV6_RECVHOPLIMIT: 1818 case IPV6_RECVRTHDR: 1819 case IPV6_RECVPATHMTU: 1820 1821 case IPV6_FAITH: 1822 case IPV6_V6ONLY: 1823 case IPV6_PORTRANGE: 1824 case IPV6_RECVTCLASS: 1825 case IPV6_AUTOFLOWLABEL: 1826 case IPV6_BINDANY: 1827 switch (optname) { 1828 1829 case IPV6_RECVHOPOPTS: 1830 optval = OPTBIT(IN6P_HOPOPTS); 1831 break; 1832 1833 case IPV6_RECVDSTOPTS: 1834 optval = OPTBIT(IN6P_DSTOPTS); 1835 break; 1836 1837 case IPV6_RECVRTHDRDSTOPTS: 1838 optval = OPTBIT(IN6P_RTHDRDSTOPTS); 1839 break; 1840 1841 case IPV6_UNICAST_HOPS: 1842 optval = in6p->in6p_hops; 1843 break; 1844 1845 case IPV6_RECVPKTINFO: 1846 optval = OPTBIT(IN6P_PKTINFO); 1847 break; 1848 1849 case IPV6_RECVHOPLIMIT: 1850 optval = OPTBIT(IN6P_HOPLIMIT); 1851 break; 1852 1853 case IPV6_RECVRTHDR: 1854 optval = OPTBIT(IN6P_RTHDR); 1855 break; 1856 1857 case IPV6_RECVPATHMTU: 1858 optval = OPTBIT(IN6P_MTU); 1859 break; 1860 1861 case IPV6_FAITH: 1862 optval = OPTBIT(INP_FAITH); 1863 break; 1864 1865 case IPV6_V6ONLY: 1866 optval = OPTBIT(IN6P_IPV6_V6ONLY); 1867 break; 1868 1869 case IPV6_PORTRANGE: 1870 { 1871 int flags; 1872 flags = in6p->inp_flags; 1873 if (flags & INP_HIGHPORT) 1874 optval = IPV6_PORTRANGE_HIGH; 1875 else if (flags & INP_LOWPORT) 1876 optval = IPV6_PORTRANGE_LOW; 1877 else 1878 optval = 0; 1879 break; 1880 } 1881 case IPV6_RECVTCLASS: 1882 optval = OPTBIT(IN6P_TCLASS); 1883 break; 1884 1885 case IPV6_AUTOFLOWLABEL: 1886 optval = OPTBIT(IN6P_AUTOFLOWLABEL); 1887 break; 1888 1889 case IPV6_BINDANY: 1890 optval = OPTBIT(INP_BINDANY); 1891 break; 1892 } 1893 if (error) 1894 break; 1895 error = sooptcopyout(sopt, &optval, 1896 sizeof optval); 1897 break; 1898 1899 case IPV6_PATHMTU: 1900 { 1901 u_long pmtu = 0; 1902 struct ip6_mtuinfo mtuinfo; 1903 struct route_in6 sro; 1904 1905 bzero(&sro, sizeof(sro)); 1906 1907 if (!(so->so_state & SS_ISCONNECTED)) 1908 return (ENOTCONN); 1909 /* 1910 * XXX: we dot not consider the case of source 1911 * routing, or optional information to specify 1912 * the outgoing interface. 1913 */ 1914 error = ip6_getpmtu(&sro, NULL, NULL, 1915 &in6p->in6p_faddr, &pmtu, NULL, 1916 so->so_fibnum); 1917 if (sro.ro_rt) 1918 RTFREE(sro.ro_rt); 1919 if (error) 1920 break; 1921 if (pmtu > IPV6_MAXPACKET) 1922 pmtu = IPV6_MAXPACKET; 1923 1924 bzero(&mtuinfo, sizeof(mtuinfo)); 1925 mtuinfo.ip6m_mtu = (u_int32_t)pmtu; 1926 optdata = (void *)&mtuinfo; 1927 optdatalen = sizeof(mtuinfo); 1928 error = sooptcopyout(sopt, optdata, 1929 optdatalen); 1930 break; 1931 } 1932 1933 case IPV6_2292PKTINFO: 1934 case IPV6_2292HOPLIMIT: 1935 case IPV6_2292HOPOPTS: 1936 case IPV6_2292RTHDR: 1937 case IPV6_2292DSTOPTS: 1938 switch (optname) { 1939 case IPV6_2292PKTINFO: 1940 optval = OPTBIT(IN6P_PKTINFO); 1941 break; 1942 case IPV6_2292HOPLIMIT: 1943 optval = OPTBIT(IN6P_HOPLIMIT); 1944 break; 1945 case IPV6_2292HOPOPTS: 1946 optval = OPTBIT(IN6P_HOPOPTS); 1947 break; 1948 case IPV6_2292RTHDR: 1949 optval = OPTBIT(IN6P_RTHDR); 1950 break; 1951 case IPV6_2292DSTOPTS: 1952 optval = OPTBIT(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); 1953 break; 1954 } 1955 error = sooptcopyout(sopt, &optval, 1956 sizeof optval); 1957 break; 1958 case IPV6_PKTINFO: 1959 case IPV6_HOPOPTS: 1960 case IPV6_RTHDR: 1961 case IPV6_DSTOPTS: 1962 case IPV6_RTHDRDSTOPTS: 1963 case IPV6_NEXTHOP: 1964 case IPV6_TCLASS: 1965 case IPV6_DONTFRAG: 1966 case IPV6_USE_MIN_MTU: 1967 case IPV6_PREFER_TEMPADDR: 1968 error = ip6_getpcbopt(in6p->in6p_outputopts, 1969 optname, sopt); 1970 break; 1971 1972 case IPV6_MULTICAST_IF: 1973 case IPV6_MULTICAST_HOPS: 1974 case IPV6_MULTICAST_LOOP: 1975 case IPV6_MSFILTER: 1976 error = ip6_getmoptions(in6p, sopt); 1977 break; 1978 1979 #ifdef IPSEC 1980 case IPV6_IPSEC_POLICY: 1981 { 1982 caddr_t req = NULL; 1983 size_t len = 0; 1984 struct mbuf *m = NULL; 1985 struct mbuf **mp = &m; 1986 size_t ovalsize = sopt->sopt_valsize; 1987 caddr_t oval = (caddr_t)sopt->sopt_val; 1988 1989 error = soopt_getm(sopt, &m); /* XXX */ 1990 if (error != 0) 1991 break; 1992 error = soopt_mcopyin(sopt, m); /* XXX */ 1993 if (error != 0) 1994 break; 1995 sopt->sopt_valsize = ovalsize; 1996 sopt->sopt_val = oval; 1997 if (m) { 1998 req = mtod(m, caddr_t); 1999 len = m->m_len; 2000 } 2001 error = ipsec_get_policy(in6p, req, len, mp); 2002 if (error == 0) 2003 error = soopt_mcopyout(sopt, m); /* XXX */ 2004 if (error == 0 && m) 2005 m_freem(m); 2006 break; 2007 } 2008 #endif /* IPSEC */ 2009 2010 default: 2011 error = ENOPROTOOPT; 2012 break; 2013 } 2014 break; 2015 } 2016 } 2017 return (error); 2018 } 2019 2020 int 2021 ip6_raw_ctloutput(struct socket *so, struct sockopt *sopt) 2022 { 2023 int error = 0, optval, optlen; 2024 const int icmp6off = offsetof(struct icmp6_hdr, icmp6_cksum); 2025 struct inpcb *in6p = sotoinpcb(so); 2026 int level, op, optname; 2027 2028 level = sopt->sopt_level; 2029 op = sopt->sopt_dir; 2030 optname = sopt->sopt_name; 2031 optlen = sopt->sopt_valsize; 2032 2033 if (level != IPPROTO_IPV6) { 2034 return (EINVAL); 2035 } 2036 2037 switch (optname) { 2038 case IPV6_CHECKSUM: 2039 /* 2040 * For ICMPv6 sockets, no modification allowed for checksum 2041 * offset, permit "no change" values to help existing apps. 2042 * 2043 * RFC3542 says: "An attempt to set IPV6_CHECKSUM 2044 * for an ICMPv6 socket will fail." 2045 * The current behavior does not meet RFC3542. 2046 */ 2047 switch (op) { 2048 case SOPT_SET: 2049 if (optlen != sizeof(int)) { 2050 error = EINVAL; 2051 break; 2052 } 2053 error = sooptcopyin(sopt, &optval, sizeof(optval), 2054 sizeof(optval)); 2055 if (error) 2056 break; 2057 if ((optval % 2) != 0) { 2058 /* the API assumes even offset values */ 2059 error = EINVAL; 2060 } else if (so->so_proto->pr_protocol == 2061 IPPROTO_ICMPV6) { 2062 if (optval != icmp6off) 2063 error = EINVAL; 2064 } else 2065 in6p->in6p_cksum = optval; 2066 break; 2067 2068 case SOPT_GET: 2069 if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) 2070 optval = icmp6off; 2071 else 2072 optval = in6p->in6p_cksum; 2073 2074 error = sooptcopyout(sopt, &optval, sizeof(optval)); 2075 break; 2076 2077 default: 2078 error = EINVAL; 2079 break; 2080 } 2081 break; 2082 2083 default: 2084 error = ENOPROTOOPT; 2085 break; 2086 } 2087 2088 return (error); 2089 } 2090 2091 /* 2092 * Set up IP6 options in pcb for insertion in output packets or 2093 * specifying behavior of outgoing packets. 2094 */ 2095 static int 2096 ip6_pcbopts(struct ip6_pktopts **pktopt, struct mbuf *m, 2097 struct socket *so, struct sockopt *sopt) 2098 { 2099 struct ip6_pktopts *opt = *pktopt; 2100 int error = 0; 2101 struct thread *td = sopt->sopt_td; 2102 2103 /* turn off any old options. */ 2104 if (opt) { 2105 #ifdef DIAGNOSTIC 2106 if (opt->ip6po_pktinfo || opt->ip6po_nexthop || 2107 opt->ip6po_hbh || opt->ip6po_dest1 || opt->ip6po_dest2 || 2108 opt->ip6po_rhinfo.ip6po_rhi_rthdr) 2109 printf("ip6_pcbopts: all specified options are cleared.\n"); 2110 #endif 2111 ip6_clearpktopts(opt, -1); 2112 } else 2113 opt = malloc(sizeof(*opt), M_IP6OPT, M_WAITOK); 2114 *pktopt = NULL; 2115 2116 if (!m || m->m_len == 0) { 2117 /* 2118 * Only turning off any previous options, regardless of 2119 * whether the opt is just created or given. 2120 */ 2121 free(opt, M_IP6OPT); 2122 return (0); 2123 } 2124 2125 /* set options specified by user. */ 2126 if ((error = ip6_setpktopts(m, opt, NULL, (td != NULL) ? 2127 td->td_ucred : NULL, so->so_proto->pr_protocol)) != 0) { 2128 ip6_clearpktopts(opt, -1); /* XXX: discard all options */ 2129 free(opt, M_IP6OPT); 2130 return (error); 2131 } 2132 *pktopt = opt; 2133 return (0); 2134 } 2135 2136 /* 2137 * initialize ip6_pktopts. beware that there are non-zero default values in 2138 * the struct. 2139 */ 2140 void 2141 ip6_initpktopts(struct ip6_pktopts *opt) 2142 { 2143 2144 bzero(opt, sizeof(*opt)); 2145 opt->ip6po_hlim = -1; /* -1 means default hop limit */ 2146 opt->ip6po_tclass = -1; /* -1 means default traffic class */ 2147 opt->ip6po_minmtu = IP6PO_MINMTU_MCASTONLY; 2148 opt->ip6po_prefer_tempaddr = IP6PO_TEMPADDR_SYSTEM; 2149 } 2150 2151 static int 2152 ip6_pcbopt(int optname, u_char *buf, int len, struct ip6_pktopts **pktopt, 2153 struct ucred *cred, int uproto) 2154 { 2155 struct ip6_pktopts *opt; 2156 2157 if (*pktopt == NULL) { 2158 *pktopt = malloc(sizeof(struct ip6_pktopts), M_IP6OPT, 2159 M_WAITOK); 2160 ip6_initpktopts(*pktopt); 2161 } 2162 opt = *pktopt; 2163 2164 return (ip6_setpktopt(optname, buf, len, opt, cred, 1, 0, uproto)); 2165 } 2166 2167 static int 2168 ip6_getpcbopt(struct ip6_pktopts *pktopt, int optname, struct sockopt *sopt) 2169 { 2170 void *optdata = NULL; 2171 int optdatalen = 0; 2172 struct ip6_ext *ip6e; 2173 int error = 0; 2174 struct in6_pktinfo null_pktinfo; 2175 int deftclass = 0, on; 2176 int defminmtu = IP6PO_MINMTU_MCASTONLY; 2177 int defpreftemp = IP6PO_TEMPADDR_SYSTEM; 2178 2179 switch (optname) { 2180 case IPV6_PKTINFO: 2181 if (pktopt && pktopt->ip6po_pktinfo) 2182 optdata = (void *)pktopt->ip6po_pktinfo; 2183 else { 2184 /* XXX: we don't have to do this every time... */ 2185 bzero(&null_pktinfo, sizeof(null_pktinfo)); 2186 optdata = (void *)&null_pktinfo; 2187 } 2188 optdatalen = sizeof(struct in6_pktinfo); 2189 break; 2190 case IPV6_TCLASS: 2191 if (pktopt && pktopt->ip6po_tclass >= 0) 2192 optdata = (void *)&pktopt->ip6po_tclass; 2193 else 2194 optdata = (void *)&deftclass; 2195 optdatalen = sizeof(int); 2196 break; 2197 case IPV6_HOPOPTS: 2198 if (pktopt && pktopt->ip6po_hbh) { 2199 optdata = (void *)pktopt->ip6po_hbh; 2200 ip6e = (struct ip6_ext *)pktopt->ip6po_hbh; 2201 optdatalen = (ip6e->ip6e_len + 1) << 3; 2202 } 2203 break; 2204 case IPV6_RTHDR: 2205 if (pktopt && pktopt->ip6po_rthdr) { 2206 optdata = (void *)pktopt->ip6po_rthdr; 2207 ip6e = (struct ip6_ext *)pktopt->ip6po_rthdr; 2208 optdatalen = (ip6e->ip6e_len + 1) << 3; 2209 } 2210 break; 2211 case IPV6_RTHDRDSTOPTS: 2212 if (pktopt && pktopt->ip6po_dest1) { 2213 optdata = (void *)pktopt->ip6po_dest1; 2214 ip6e = (struct ip6_ext *)pktopt->ip6po_dest1; 2215 optdatalen = (ip6e->ip6e_len + 1) << 3; 2216 } 2217 break; 2218 case IPV6_DSTOPTS: 2219 if (pktopt && pktopt->ip6po_dest2) { 2220 optdata = (void *)pktopt->ip6po_dest2; 2221 ip6e = (struct ip6_ext *)pktopt->ip6po_dest2; 2222 optdatalen = (ip6e->ip6e_len + 1) << 3; 2223 } 2224 break; 2225 case IPV6_NEXTHOP: 2226 if (pktopt && pktopt->ip6po_nexthop) { 2227 optdata = (void *)pktopt->ip6po_nexthop; 2228 optdatalen = pktopt->ip6po_nexthop->sa_len; 2229 } 2230 break; 2231 case IPV6_USE_MIN_MTU: 2232 if (pktopt) 2233 optdata = (void *)&pktopt->ip6po_minmtu; 2234 else 2235 optdata = (void *)&defminmtu; 2236 optdatalen = sizeof(int); 2237 break; 2238 case IPV6_DONTFRAG: 2239 if (pktopt && ((pktopt->ip6po_flags) & IP6PO_DONTFRAG)) 2240 on = 1; 2241 else 2242 on = 0; 2243 optdata = (void *)&on; 2244 optdatalen = sizeof(on); 2245 break; 2246 case IPV6_PREFER_TEMPADDR: 2247 if (pktopt) 2248 optdata = (void *)&pktopt->ip6po_prefer_tempaddr; 2249 else 2250 optdata = (void *)&defpreftemp; 2251 optdatalen = sizeof(int); 2252 break; 2253 default: /* should not happen */ 2254 #ifdef DIAGNOSTIC 2255 panic("ip6_getpcbopt: unexpected option\n"); 2256 #endif 2257 return (ENOPROTOOPT); 2258 } 2259 2260 error = sooptcopyout(sopt, optdata, optdatalen); 2261 2262 return (error); 2263 } 2264 2265 void 2266 ip6_clearpktopts(struct ip6_pktopts *pktopt, int optname) 2267 { 2268 if (pktopt == NULL) 2269 return; 2270 2271 if (optname == -1 || optname == IPV6_PKTINFO) { 2272 if (pktopt->ip6po_pktinfo) 2273 free(pktopt->ip6po_pktinfo, M_IP6OPT); 2274 pktopt->ip6po_pktinfo = NULL; 2275 } 2276 if (optname == -1 || optname == IPV6_HOPLIMIT) 2277 pktopt->ip6po_hlim = -1; 2278 if (optname == -1 || optname == IPV6_TCLASS) 2279 pktopt->ip6po_tclass = -1; 2280 if (optname == -1 || optname == IPV6_NEXTHOP) { 2281 if (pktopt->ip6po_nextroute.ro_rt) { 2282 RTFREE(pktopt->ip6po_nextroute.ro_rt); 2283 pktopt->ip6po_nextroute.ro_rt = NULL; 2284 } 2285 if (pktopt->ip6po_nexthop) 2286 free(pktopt->ip6po_nexthop, M_IP6OPT); 2287 pktopt->ip6po_nexthop = NULL; 2288 } 2289 if (optname == -1 || optname == IPV6_HOPOPTS) { 2290 if (pktopt->ip6po_hbh) 2291 free(pktopt->ip6po_hbh, M_IP6OPT); 2292 pktopt->ip6po_hbh = NULL; 2293 } 2294 if (optname == -1 || optname == IPV6_RTHDRDSTOPTS) { 2295 if (pktopt->ip6po_dest1) 2296 free(pktopt->ip6po_dest1, M_IP6OPT); 2297 pktopt->ip6po_dest1 = NULL; 2298 } 2299 if (optname == -1 || optname == IPV6_RTHDR) { 2300 if (pktopt->ip6po_rhinfo.ip6po_rhi_rthdr) 2301 free(pktopt->ip6po_rhinfo.ip6po_rhi_rthdr, M_IP6OPT); 2302 pktopt->ip6po_rhinfo.ip6po_rhi_rthdr = NULL; 2303 if (pktopt->ip6po_route.ro_rt) { 2304 RTFREE(pktopt->ip6po_route.ro_rt); 2305 pktopt->ip6po_route.ro_rt = NULL; 2306 } 2307 } 2308 if (optname == -1 || optname == IPV6_DSTOPTS) { 2309 if (pktopt->ip6po_dest2) 2310 free(pktopt->ip6po_dest2, M_IP6OPT); 2311 pktopt->ip6po_dest2 = NULL; 2312 } 2313 } 2314 2315 #define PKTOPT_EXTHDRCPY(type) \ 2316 do {\ 2317 if (src->type) {\ 2318 int hlen = (((struct ip6_ext *)src->type)->ip6e_len + 1) << 3;\ 2319 dst->type = malloc(hlen, M_IP6OPT, canwait);\ 2320 if (dst->type == NULL && canwait == M_NOWAIT)\ 2321 goto bad;\ 2322 bcopy(src->type, dst->type, hlen);\ 2323 }\ 2324 } while (/*CONSTCOND*/ 0) 2325 2326 static int 2327 copypktopts(struct ip6_pktopts *dst, struct ip6_pktopts *src, int canwait) 2328 { 2329 if (dst == NULL || src == NULL) { 2330 printf("ip6_clearpktopts: invalid argument\n"); 2331 return (EINVAL); 2332 } 2333 2334 dst->ip6po_hlim = src->ip6po_hlim; 2335 dst->ip6po_tclass = src->ip6po_tclass; 2336 dst->ip6po_flags = src->ip6po_flags; 2337 dst->ip6po_minmtu = src->ip6po_minmtu; 2338 dst->ip6po_prefer_tempaddr = src->ip6po_prefer_tempaddr; 2339 if (src->ip6po_pktinfo) { 2340 dst->ip6po_pktinfo = malloc(sizeof(*dst->ip6po_pktinfo), 2341 M_IP6OPT, canwait); 2342 if (dst->ip6po_pktinfo == NULL) 2343 goto bad; 2344 *dst->ip6po_pktinfo = *src->ip6po_pktinfo; 2345 } 2346 if (src->ip6po_nexthop) { 2347 dst->ip6po_nexthop = malloc(src->ip6po_nexthop->sa_len, 2348 M_IP6OPT, canwait); 2349 if (dst->ip6po_nexthop == NULL) 2350 goto bad; 2351 bcopy(src->ip6po_nexthop, dst->ip6po_nexthop, 2352 src->ip6po_nexthop->sa_len); 2353 } 2354 PKTOPT_EXTHDRCPY(ip6po_hbh); 2355 PKTOPT_EXTHDRCPY(ip6po_dest1); 2356 PKTOPT_EXTHDRCPY(ip6po_dest2); 2357 PKTOPT_EXTHDRCPY(ip6po_rthdr); /* not copy the cached route */ 2358 return (0); 2359 2360 bad: 2361 ip6_clearpktopts(dst, -1); 2362 return (ENOBUFS); 2363 } 2364 #undef PKTOPT_EXTHDRCPY 2365 2366 struct ip6_pktopts * 2367 ip6_copypktopts(struct ip6_pktopts *src, int canwait) 2368 { 2369 int error; 2370 struct ip6_pktopts *dst; 2371 2372 dst = malloc(sizeof(*dst), M_IP6OPT, canwait); 2373 if (dst == NULL) 2374 return (NULL); 2375 ip6_initpktopts(dst); 2376 2377 if ((error = copypktopts(dst, src, canwait)) != 0) { 2378 free(dst, M_IP6OPT); 2379 return (NULL); 2380 } 2381 2382 return (dst); 2383 } 2384 2385 void 2386 ip6_freepcbopts(struct ip6_pktopts *pktopt) 2387 { 2388 if (pktopt == NULL) 2389 return; 2390 2391 ip6_clearpktopts(pktopt, -1); 2392 2393 free(pktopt, M_IP6OPT); 2394 } 2395 2396 /* 2397 * Set IPv6 outgoing packet options based on advanced API. 2398 */ 2399 int 2400 ip6_setpktopts(struct mbuf *control, struct ip6_pktopts *opt, 2401 struct ip6_pktopts *stickyopt, struct ucred *cred, int uproto) 2402 { 2403 struct cmsghdr *cm = 0; 2404 2405 if (control == NULL || opt == NULL) 2406 return (EINVAL); 2407 2408 ip6_initpktopts(opt); 2409 if (stickyopt) { 2410 int error; 2411 2412 /* 2413 * If stickyopt is provided, make a local copy of the options 2414 * for this particular packet, then override them by ancillary 2415 * objects. 2416 * XXX: copypktopts() does not copy the cached route to a next 2417 * hop (if any). This is not very good in terms of efficiency, 2418 * but we can allow this since this option should be rarely 2419 * used. 2420 */ 2421 if ((error = copypktopts(opt, stickyopt, M_NOWAIT)) != 0) 2422 return (error); 2423 } 2424 2425 /* 2426 * XXX: Currently, we assume all the optional information is stored 2427 * in a single mbuf. 2428 */ 2429 if (control->m_next) 2430 return (EINVAL); 2431 2432 for (; control->m_len > 0; control->m_data += CMSG_ALIGN(cm->cmsg_len), 2433 control->m_len -= CMSG_ALIGN(cm->cmsg_len)) { 2434 int error; 2435 2436 if (control->m_len < CMSG_LEN(0)) 2437 return (EINVAL); 2438 2439 cm = mtod(control, struct cmsghdr *); 2440 if (cm->cmsg_len == 0 || cm->cmsg_len > control->m_len) 2441 return (EINVAL); 2442 if (cm->cmsg_level != IPPROTO_IPV6) 2443 continue; 2444 2445 error = ip6_setpktopt(cm->cmsg_type, CMSG_DATA(cm), 2446 cm->cmsg_len - CMSG_LEN(0), opt, cred, 0, 1, uproto); 2447 if (error) 2448 return (error); 2449 } 2450 2451 return (0); 2452 } 2453 2454 /* 2455 * Set a particular packet option, as a sticky option or an ancillary data 2456 * item. "len" can be 0 only when it's a sticky option. 2457 * We have 4 cases of combination of "sticky" and "cmsg": 2458 * "sticky=0, cmsg=0": impossible 2459 * "sticky=0, cmsg=1": RFC2292 or RFC3542 ancillary data 2460 * "sticky=1, cmsg=0": RFC3542 socket option 2461 * "sticky=1, cmsg=1": RFC2292 socket option 2462 */ 2463 static int 2464 ip6_setpktopt(int optname, u_char *buf, int len, struct ip6_pktopts *opt, 2465 struct ucred *cred, int sticky, int cmsg, int uproto) 2466 { 2467 int minmtupolicy, preftemp; 2468 int error; 2469 2470 if (!sticky && !cmsg) { 2471 #ifdef DIAGNOSTIC 2472 printf("ip6_setpktopt: impossible case\n"); 2473 #endif 2474 return (EINVAL); 2475 } 2476 2477 /* 2478 * IPV6_2292xxx is for backward compatibility to RFC2292, and should 2479 * not be specified in the context of RFC3542. Conversely, 2480 * RFC3542 types should not be specified in the context of RFC2292. 2481 */ 2482 if (!cmsg) { 2483 switch (optname) { 2484 case IPV6_2292PKTINFO: 2485 case IPV6_2292HOPLIMIT: 2486 case IPV6_2292NEXTHOP: 2487 case IPV6_2292HOPOPTS: 2488 case IPV6_2292DSTOPTS: 2489 case IPV6_2292RTHDR: 2490 case IPV6_2292PKTOPTIONS: 2491 return (ENOPROTOOPT); 2492 } 2493 } 2494 if (sticky && cmsg) { 2495 switch (optname) { 2496 case IPV6_PKTINFO: 2497 case IPV6_HOPLIMIT: 2498 case IPV6_NEXTHOP: 2499 case IPV6_HOPOPTS: 2500 case IPV6_DSTOPTS: 2501 case IPV6_RTHDRDSTOPTS: 2502 case IPV6_RTHDR: 2503 case IPV6_USE_MIN_MTU: 2504 case IPV6_DONTFRAG: 2505 case IPV6_TCLASS: 2506 case IPV6_PREFER_TEMPADDR: /* XXX: not an RFC3542 option */ 2507 return (ENOPROTOOPT); 2508 } 2509 } 2510 2511 switch (optname) { 2512 case IPV6_2292PKTINFO: 2513 case IPV6_PKTINFO: 2514 { 2515 struct ifnet *ifp = NULL; 2516 struct in6_pktinfo *pktinfo; 2517 2518 if (len != sizeof(struct in6_pktinfo)) 2519 return (EINVAL); 2520 2521 pktinfo = (struct in6_pktinfo *)buf; 2522 2523 /* 2524 * An application can clear any sticky IPV6_PKTINFO option by 2525 * doing a "regular" setsockopt with ipi6_addr being 2526 * in6addr_any and ipi6_ifindex being zero. 2527 * [RFC 3542, Section 6] 2528 */ 2529 if (optname == IPV6_PKTINFO && opt->ip6po_pktinfo && 2530 pktinfo->ipi6_ifindex == 0 && 2531 IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) { 2532 ip6_clearpktopts(opt, optname); 2533 break; 2534 } 2535 2536 if (uproto == IPPROTO_TCP && optname == IPV6_PKTINFO && 2537 sticky && !IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) { 2538 return (EINVAL); 2539 } 2540 2541 /* validate the interface index if specified. */ 2542 if (pktinfo->ipi6_ifindex > V_if_index || 2543 pktinfo->ipi6_ifindex < 0) { 2544 return (ENXIO); 2545 } 2546 if (pktinfo->ipi6_ifindex) { 2547 ifp = ifnet_byindex(pktinfo->ipi6_ifindex); 2548 if (ifp == NULL) 2549 return (ENXIO); 2550 } 2551 2552 /* 2553 * We store the address anyway, and let in6_selectsrc() 2554 * validate the specified address. This is because ipi6_addr 2555 * may not have enough information about its scope zone, and 2556 * we may need additional information (such as outgoing 2557 * interface or the scope zone of a destination address) to 2558 * disambiguate the scope. 2559 * XXX: the delay of the validation may confuse the 2560 * application when it is used as a sticky option. 2561 */ 2562 if (opt->ip6po_pktinfo == NULL) { 2563 opt->ip6po_pktinfo = malloc(sizeof(*pktinfo), 2564 M_IP6OPT, M_NOWAIT); 2565 if (opt->ip6po_pktinfo == NULL) 2566 return (ENOBUFS); 2567 } 2568 bcopy(pktinfo, opt->ip6po_pktinfo, sizeof(*pktinfo)); 2569 break; 2570 } 2571 2572 case IPV6_2292HOPLIMIT: 2573 case IPV6_HOPLIMIT: 2574 { 2575 int *hlimp; 2576 2577 /* 2578 * RFC 3542 deprecated the usage of sticky IPV6_HOPLIMIT 2579 * to simplify the ordering among hoplimit options. 2580 */ 2581 if (optname == IPV6_HOPLIMIT && sticky) 2582 return (ENOPROTOOPT); 2583 2584 if (len != sizeof(int)) 2585 return (EINVAL); 2586 hlimp = (int *)buf; 2587 if (*hlimp < -1 || *hlimp > 255) 2588 return (EINVAL); 2589 2590 opt->ip6po_hlim = *hlimp; 2591 break; 2592 } 2593 2594 case IPV6_TCLASS: 2595 { 2596 int tclass; 2597 2598 if (len != sizeof(int)) 2599 return (EINVAL); 2600 tclass = *(int *)buf; 2601 if (tclass < -1 || tclass > 255) 2602 return (EINVAL); 2603 2604 opt->ip6po_tclass = tclass; 2605 break; 2606 } 2607 2608 case IPV6_2292NEXTHOP: 2609 case IPV6_NEXTHOP: 2610 if (cred != NULL) { 2611 error = priv_check_cred(cred, 2612 PRIV_NETINET_SETHDROPTS, 0); 2613 if (error) 2614 return (error); 2615 } 2616 2617 if (len == 0) { /* just remove the option */ 2618 ip6_clearpktopts(opt, IPV6_NEXTHOP); 2619 break; 2620 } 2621 2622 /* check if cmsg_len is large enough for sa_len */ 2623 if (len < sizeof(struct sockaddr) || len < *buf) 2624 return (EINVAL); 2625 2626 switch (((struct sockaddr *)buf)->sa_family) { 2627 case AF_INET6: 2628 { 2629 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)buf; 2630 int error; 2631 2632 if (sa6->sin6_len != sizeof(struct sockaddr_in6)) 2633 return (EINVAL); 2634 2635 if (IN6_IS_ADDR_UNSPECIFIED(&sa6->sin6_addr) || 2636 IN6_IS_ADDR_MULTICAST(&sa6->sin6_addr)) { 2637 return (EINVAL); 2638 } 2639 if ((error = sa6_embedscope(sa6, V_ip6_use_defzone)) 2640 != 0) { 2641 return (error); 2642 } 2643 break; 2644 } 2645 case AF_LINK: /* should eventually be supported */ 2646 default: 2647 return (EAFNOSUPPORT); 2648 } 2649 2650 /* turn off the previous option, then set the new option. */ 2651 ip6_clearpktopts(opt, IPV6_NEXTHOP); 2652 opt->ip6po_nexthop = malloc(*buf, M_IP6OPT, M_NOWAIT); 2653 if (opt->ip6po_nexthop == NULL) 2654 return (ENOBUFS); 2655 bcopy(buf, opt->ip6po_nexthop, *buf); 2656 break; 2657 2658 case IPV6_2292HOPOPTS: 2659 case IPV6_HOPOPTS: 2660 { 2661 struct ip6_hbh *hbh; 2662 int hbhlen; 2663 2664 /* 2665 * XXX: We don't allow a non-privileged user to set ANY HbH 2666 * options, since per-option restriction has too much 2667 * overhead. 2668 */ 2669 if (cred != NULL) { 2670 error = priv_check_cred(cred, 2671 PRIV_NETINET_SETHDROPTS, 0); 2672 if (error) 2673 return (error); 2674 } 2675 2676 if (len == 0) { 2677 ip6_clearpktopts(opt, IPV6_HOPOPTS); 2678 break; /* just remove the option */ 2679 } 2680 2681 /* message length validation */ 2682 if (len < sizeof(struct ip6_hbh)) 2683 return (EINVAL); 2684 hbh = (struct ip6_hbh *)buf; 2685 hbhlen = (hbh->ip6h_len + 1) << 3; 2686 if (len != hbhlen) 2687 return (EINVAL); 2688 2689 /* turn off the previous option, then set the new option. */ 2690 ip6_clearpktopts(opt, IPV6_HOPOPTS); 2691 opt->ip6po_hbh = malloc(hbhlen, M_IP6OPT, M_NOWAIT); 2692 if (opt->ip6po_hbh == NULL) 2693 return (ENOBUFS); 2694 bcopy(hbh, opt->ip6po_hbh, hbhlen); 2695 2696 break; 2697 } 2698 2699 case IPV6_2292DSTOPTS: 2700 case IPV6_DSTOPTS: 2701 case IPV6_RTHDRDSTOPTS: 2702 { 2703 struct ip6_dest *dest, **newdest = NULL; 2704 int destlen; 2705 2706 if (cred != NULL) { /* XXX: see the comment for IPV6_HOPOPTS */ 2707 error = priv_check_cred(cred, 2708 PRIV_NETINET_SETHDROPTS, 0); 2709 if (error) 2710 return (error); 2711 } 2712 2713 if (len == 0) { 2714 ip6_clearpktopts(opt, optname); 2715 break; /* just remove the option */ 2716 } 2717 2718 /* message length validation */ 2719 if (len < sizeof(struct ip6_dest)) 2720 return (EINVAL); 2721 dest = (struct ip6_dest *)buf; 2722 destlen = (dest->ip6d_len + 1) << 3; 2723 if (len != destlen) 2724 return (EINVAL); 2725 2726 /* 2727 * Determine the position that the destination options header 2728 * should be inserted; before or after the routing header. 2729 */ 2730 switch (optname) { 2731 case IPV6_2292DSTOPTS: 2732 /* 2733 * The old advacned API is ambiguous on this point. 2734 * Our approach is to determine the position based 2735 * according to the existence of a routing header. 2736 * Note, however, that this depends on the order of the 2737 * extension headers in the ancillary data; the 1st 2738 * part of the destination options header must appear 2739 * before the routing header in the ancillary data, 2740 * too. 2741 * RFC3542 solved the ambiguity by introducing 2742 * separate ancillary data or option types. 2743 */ 2744 if (opt->ip6po_rthdr == NULL) 2745 newdest = &opt->ip6po_dest1; 2746 else 2747 newdest = &opt->ip6po_dest2; 2748 break; 2749 case IPV6_RTHDRDSTOPTS: 2750 newdest = &opt->ip6po_dest1; 2751 break; 2752 case IPV6_DSTOPTS: 2753 newdest = &opt->ip6po_dest2; 2754 break; 2755 } 2756 2757 /* turn off the previous option, then set the new option. */ 2758 ip6_clearpktopts(opt, optname); 2759 *newdest = malloc(destlen, M_IP6OPT, M_NOWAIT); 2760 if (*newdest == NULL) 2761 return (ENOBUFS); 2762 bcopy(dest, *newdest, destlen); 2763 2764 break; 2765 } 2766 2767 case IPV6_2292RTHDR: 2768 case IPV6_RTHDR: 2769 { 2770 struct ip6_rthdr *rth; 2771 int rthlen; 2772 2773 if (len == 0) { 2774 ip6_clearpktopts(opt, IPV6_RTHDR); 2775 break; /* just remove the option */ 2776 } 2777 2778 /* message length validation */ 2779 if (len < sizeof(struct ip6_rthdr)) 2780 return (EINVAL); 2781 rth = (struct ip6_rthdr *)buf; 2782 rthlen = (rth->ip6r_len + 1) << 3; 2783 if (len != rthlen) 2784 return (EINVAL); 2785 2786 switch (rth->ip6r_type) { 2787 case IPV6_RTHDR_TYPE_0: 2788 if (rth->ip6r_len == 0) /* must contain one addr */ 2789 return (EINVAL); 2790 if (rth->ip6r_len % 2) /* length must be even */ 2791 return (EINVAL); 2792 if (rth->ip6r_len / 2 != rth->ip6r_segleft) 2793 return (EINVAL); 2794 break; 2795 default: 2796 return (EINVAL); /* not supported */ 2797 } 2798 2799 /* turn off the previous option */ 2800 ip6_clearpktopts(opt, IPV6_RTHDR); 2801 opt->ip6po_rthdr = malloc(rthlen, M_IP6OPT, M_NOWAIT); 2802 if (opt->ip6po_rthdr == NULL) 2803 return (ENOBUFS); 2804 bcopy(rth, opt->ip6po_rthdr, rthlen); 2805 2806 break; 2807 } 2808 2809 case IPV6_USE_MIN_MTU: 2810 if (len != sizeof(int)) 2811 return (EINVAL); 2812 minmtupolicy = *(int *)buf; 2813 if (minmtupolicy != IP6PO_MINMTU_MCASTONLY && 2814 minmtupolicy != IP6PO_MINMTU_DISABLE && 2815 minmtupolicy != IP6PO_MINMTU_ALL) { 2816 return (EINVAL); 2817 } 2818 opt->ip6po_minmtu = minmtupolicy; 2819 break; 2820 2821 case IPV6_DONTFRAG: 2822 if (len != sizeof(int)) 2823 return (EINVAL); 2824 2825 if (uproto == IPPROTO_TCP || *(int *)buf == 0) { 2826 /* 2827 * we ignore this option for TCP sockets. 2828 * (RFC3542 leaves this case unspecified.) 2829 */ 2830 opt->ip6po_flags &= ~IP6PO_DONTFRAG; 2831 } else 2832 opt->ip6po_flags |= IP6PO_DONTFRAG; 2833 break; 2834 2835 case IPV6_PREFER_TEMPADDR: 2836 if (len != sizeof(int)) 2837 return (EINVAL); 2838 preftemp = *(int *)buf; 2839 if (preftemp != IP6PO_TEMPADDR_SYSTEM && 2840 preftemp != IP6PO_TEMPADDR_NOTPREFER && 2841 preftemp != IP6PO_TEMPADDR_PREFER) { 2842 return (EINVAL); 2843 } 2844 opt->ip6po_prefer_tempaddr = preftemp; 2845 break; 2846 2847 default: 2848 return (ENOPROTOOPT); 2849 } /* end of switch */ 2850 2851 return (0); 2852 } 2853 2854 /* 2855 * Routine called from ip6_output() to loop back a copy of an IP6 multicast 2856 * packet to the input queue of a specified interface. Note that this 2857 * calls the output routine of the loopback "driver", but with an interface 2858 * pointer that might NOT be &loif -- easier than replicating that code here. 2859 */ 2860 void 2861 ip6_mloopback(struct ifnet *ifp, struct mbuf *m, struct sockaddr_in6 *dst) 2862 { 2863 struct mbuf *copym; 2864 struct ip6_hdr *ip6; 2865 2866 copym = m_copy(m, 0, M_COPYALL); 2867 if (copym == NULL) 2868 return; 2869 2870 /* 2871 * Make sure to deep-copy IPv6 header portion in case the data 2872 * is in an mbuf cluster, so that we can safely override the IPv6 2873 * header portion later. 2874 */ 2875 if ((copym->m_flags & M_EXT) != 0 || 2876 copym->m_len < sizeof(struct ip6_hdr)) { 2877 copym = m_pullup(copym, sizeof(struct ip6_hdr)); 2878 if (copym == NULL) 2879 return; 2880 } 2881 2882 #ifdef DIAGNOSTIC 2883 if (copym->m_len < sizeof(*ip6)) { 2884 m_freem(copym); 2885 return; 2886 } 2887 #endif 2888 2889 ip6 = mtod(copym, struct ip6_hdr *); 2890 /* 2891 * clear embedded scope identifiers if necessary. 2892 * in6_clearscope will touch the addresses only when necessary. 2893 */ 2894 in6_clearscope(&ip6->ip6_src); 2895 in6_clearscope(&ip6->ip6_dst); 2896 2897 (void)if_simloop(ifp, copym, dst->sin6_family, 0); 2898 } 2899 2900 /* 2901 * Chop IPv6 header off from the payload. 2902 */ 2903 static int 2904 ip6_splithdr(struct mbuf *m, struct ip6_exthdrs *exthdrs) 2905 { 2906 struct mbuf *mh; 2907 struct ip6_hdr *ip6; 2908 2909 ip6 = mtod(m, struct ip6_hdr *); 2910 if (m->m_len > sizeof(*ip6)) { 2911 MGETHDR(mh, M_DONTWAIT, MT_HEADER); 2912 if (mh == 0) { 2913 m_freem(m); 2914 return ENOBUFS; 2915 } 2916 M_MOVE_PKTHDR(mh, m); 2917 MH_ALIGN(mh, sizeof(*ip6)); 2918 m->m_len -= sizeof(*ip6); 2919 m->m_data += sizeof(*ip6); 2920 mh->m_next = m; 2921 m = mh; 2922 m->m_len = sizeof(*ip6); 2923 bcopy((caddr_t)ip6, mtod(m, caddr_t), sizeof(*ip6)); 2924 } 2925 exthdrs->ip6e_ip6 = m; 2926 return 0; 2927 } 2928 2929 /* 2930 * Compute IPv6 extension header length. 2931 */ 2932 int 2933 ip6_optlen(struct inpcb *in6p) 2934 { 2935 int len; 2936 2937 if (!in6p->in6p_outputopts) 2938 return 0; 2939 2940 len = 0; 2941 #define elen(x) \ 2942 (((struct ip6_ext *)(x)) ? (((struct ip6_ext *)(x))->ip6e_len + 1) << 3 : 0) 2943 2944 len += elen(in6p->in6p_outputopts->ip6po_hbh); 2945 if (in6p->in6p_outputopts->ip6po_rthdr) 2946 /* dest1 is valid with rthdr only */ 2947 len += elen(in6p->in6p_outputopts->ip6po_dest1); 2948 len += elen(in6p->in6p_outputopts->ip6po_rthdr); 2949 len += elen(in6p->in6p_outputopts->ip6po_dest2); 2950 return len; 2951 #undef elen 2952 }
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