ip6_output.c revision 242079
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: head/sys/netinet6/ip6_output.c 242079 2012-10-25 09:39:14Z ae $"); 65 66#include "opt_inet.h" 67#include "opt_inet6.h" 68#include "opt_ipfw.h" 69#include "opt_ipsec.h" 70#include "opt_sctp.h" 71#include "opt_route.h" 72 73#include <sys/param.h> 74#include <sys/kernel.h> 75#include <sys/malloc.h> 76#include <sys/mbuf.h> 77#include <sys/errno.h> 78#include <sys/priv.h> 79#include <sys/proc.h> 80#include <sys/protosw.h> 81#include <sys/socket.h> 82#include <sys/socketvar.h> 83#include <sys/syslog.h> 84#include <sys/ucred.h> 85 86#include <machine/in_cksum.h> 87 88#include <net/if.h> 89#include <net/netisr.h> 90#include <net/route.h> 91#include <net/pfil.h> 92#include <net/vnet.h> 93 94#include <netinet/in.h> 95#include <netinet/in_var.h> 96#include <netinet/ip_var.h> 97#include <netinet6/in6_var.h> 98#include <netinet/ip6.h> 99#include <netinet/icmp6.h> 100#include <netinet6/ip6_var.h> 101#include <netinet/in_pcb.h> 102#include <netinet/tcp_var.h> 103#include <netinet6/nd6.h> 104 105#ifdef IPSEC 106#include <netipsec/ipsec.h> 107#include <netipsec/ipsec6.h> 108#include <netipsec/key.h> 109#include <netinet6/ip6_ipsec.h> 110#endif /* IPSEC */ 111#ifdef SCTP 112#include <netinet/sctp.h> 113#include <netinet/sctp_crc32.h> 114#endif 115 116#include <netinet6/ip6protosw.h> 117#include <netinet6/scope6_var.h> 118 119#ifdef FLOWTABLE 120#include <net/flowtable.h> 121#endif 122 123extern int in6_mcast_loop; 124 125struct ip6_exthdrs { 126 struct mbuf *ip6e_ip6; 127 struct mbuf *ip6e_hbh; 128 struct mbuf *ip6e_dest1; 129 struct mbuf *ip6e_rthdr; 130 struct mbuf *ip6e_dest2; 131}; 132 133static int ip6_pcbopt(int, u_char *, int, struct ip6_pktopts **, 134 struct ucred *, int); 135static int ip6_pcbopts(struct ip6_pktopts **, struct mbuf *, 136 struct socket *, struct sockopt *); 137static int ip6_getpcbopt(struct ip6_pktopts *, int, struct sockopt *); 138static int ip6_setpktopt(int, u_char *, int, struct ip6_pktopts *, 139 struct ucred *, int, int, int); 140 141static int ip6_copyexthdr(struct mbuf **, caddr_t, int); 142static int ip6_insertfraghdr(struct mbuf *, struct mbuf *, int, 143 struct ip6_frag **); 144static int ip6_insert_jumboopt(struct ip6_exthdrs *, u_int32_t); 145static int ip6_splithdr(struct mbuf *, struct ip6_exthdrs *); 146static int ip6_getpmtu(struct route_in6 *, struct route_in6 *, 147 struct ifnet *, struct in6_addr *, u_long *, int *, u_int); 148static int copypktopts(struct ip6_pktopts *, struct ip6_pktopts *, int); 149 150 151/* 152 * Make an extension header from option data. hp is the source, and 153 * mp is the destination. 154 */ 155#define MAKE_EXTHDR(hp, mp) \ 156 do { \ 157 if (hp) { \ 158 struct ip6_ext *eh = (struct ip6_ext *)(hp); \ 159 error = ip6_copyexthdr((mp), (caddr_t)(hp), \ 160 ((eh)->ip6e_len + 1) << 3); \ 161 if (error) \ 162 goto freehdrs; \ 163 } \ 164 } while (/*CONSTCOND*/ 0) 165 166/* 167 * Form a chain of extension headers. 168 * m is the extension header mbuf 169 * mp is the previous mbuf in the chain 170 * p is the next header 171 * i is the type of option. 172 */ 173#define MAKE_CHAIN(m, mp, p, i)\ 174 do {\ 175 if (m) {\ 176 if (!hdrsplit) \ 177 panic("assumption failed: hdr not split"); \ 178 *mtod((m), u_char *) = *(p);\ 179 *(p) = (i);\ 180 p = mtod((m), u_char *);\ 181 (m)->m_next = (mp)->m_next;\ 182 (mp)->m_next = (m);\ 183 (mp) = (m);\ 184 }\ 185 } while (/*CONSTCOND*/ 0) 186 187static void 188in6_delayed_cksum(struct mbuf *m, uint32_t plen, u_short offset) 189{ 190 u_short csum; 191 192 csum = in_cksum_skip(m, offset + plen, offset); 193 if (m->m_pkthdr.csum_flags & CSUM_UDP_IPV6 && csum == 0) 194 csum = 0xffff; 195 offset += m->m_pkthdr.csum_data; /* checksum offset */ 196 197 if (offset + sizeof(u_short) > m->m_len) { 198 printf("%s: delayed m_pullup, m->len: %d plen %u off %u " 199 "csum_flags=0x%04x\n", __func__, m->m_len, plen, offset, 200 m->m_pkthdr.csum_flags); 201 /* 202 * XXX this should not happen, but if it does, the correct 203 * behavior may be to insert the checksum in the appropriate 204 * next mbuf in the chain. 205 */ 206 return; 207 } 208 *(u_short *)(m->m_data + offset) = csum; 209} 210 211/* 212 * IP6 output. The packet in mbuf chain m contains a skeletal IP6 213 * header (with pri, len, nxt, hlim, src, dst). 214 * This function may modify ver and hlim only. 215 * The mbuf chain containing the packet will be freed. 216 * The mbuf opt, if present, will not be freed. 217 * If route_in6 ro is present and has ro_rt initialized, route lookup would be 218 * skipped and ro->ro_rt would be used. If ro is present but ro->ro_rt is NULL, 219 * then result of route lookup is stored in ro->ro_rt. 220 * 221 * type of "mtu": rt_rmx.rmx_mtu is u_long, ifnet.ifr_mtu is int, and 222 * nd_ifinfo.linkmtu is u_int32_t. so we use u_long to hold largest one, 223 * which is rt_rmx.rmx_mtu. 224 * 225 * ifpp - XXX: just for statistics 226 */ 227int 228ip6_output(struct mbuf *m0, struct ip6_pktopts *opt, 229 struct route_in6 *ro, int flags, struct ip6_moptions *im6o, 230 struct ifnet **ifpp, struct inpcb *inp) 231{ 232 struct ip6_hdr *ip6, *mhip6; 233 struct ifnet *ifp, *origifp; 234 struct mbuf *m = m0; 235 struct mbuf *mprev = NULL; 236 int hlen, tlen, len, off; 237 struct route_in6 ip6route; 238 struct rtentry *rt = NULL; 239 struct sockaddr_in6 *dst, src_sa, dst_sa; 240 struct in6_addr odst; 241 int error = 0; 242 struct in6_ifaddr *ia = NULL; 243 u_long mtu; 244 int alwaysfrag, dontfrag; 245 u_int32_t optlen = 0, plen = 0, unfragpartlen = 0; 246 struct ip6_exthdrs exthdrs; 247 struct in6_addr finaldst, src0, dst0; 248 u_int32_t zone; 249 struct route_in6 *ro_pmtu = NULL; 250 int hdrsplit = 0; 251 int needipsec = 0; 252 int sw_csum, tso; 253#ifdef IPSEC 254 struct ipsec_output_state state; 255 struct ip6_rthdr *rh = NULL; 256 int needipsectun = 0; 257 int segleft_org = 0; 258 struct secpolicy *sp = NULL; 259#endif /* IPSEC */ 260 struct m_tag *fwd_tag; 261 262 ip6 = mtod(m, struct ip6_hdr *); 263 if (ip6 == NULL) { 264 printf ("ip6 is NULL"); 265 goto bad; 266 } 267 268 if (inp != NULL) 269 M_SETFIB(m, inp->inp_inc.inc_fibnum); 270 271 finaldst = ip6->ip6_dst; 272 bzero(&exthdrs, sizeof(exthdrs)); 273 if (opt) { 274 /* Hop-by-Hop options header */ 275 MAKE_EXTHDR(opt->ip6po_hbh, &exthdrs.ip6e_hbh); 276 /* Destination options header(1st part) */ 277 if (opt->ip6po_rthdr) { 278 /* 279 * Destination options header(1st part) 280 * This only makes sense with a routing header. 281 * See Section 9.2 of RFC 3542. 282 * Disabling this part just for MIP6 convenience is 283 * a bad idea. We need to think carefully about a 284 * way to make the advanced API coexist with MIP6 285 * options, which might automatically be inserted in 286 * the kernel. 287 */ 288 MAKE_EXTHDR(opt->ip6po_dest1, &exthdrs.ip6e_dest1); 289 } 290 /* Routing header */ 291 MAKE_EXTHDR(opt->ip6po_rthdr, &exthdrs.ip6e_rthdr); 292 /* Destination options header(2nd part) */ 293 MAKE_EXTHDR(opt->ip6po_dest2, &exthdrs.ip6e_dest2); 294 } 295 296#ifdef IPSEC 297 /* 298 * IPSec checking which handles several cases. 299 * FAST IPSEC: We re-injected the packet. 300 */ 301 switch(ip6_ipsec_output(&m, inp, &flags, &error, &ifp, &sp)) 302 { 303 case 1: /* Bad packet */ 304 goto freehdrs; 305 case -1: /* Do IPSec */ 306 needipsec = 1; 307 /* 308 * Do delayed checksums now, as we may send before returning. 309 */ 310 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6) { 311 plen = m->m_pkthdr.len - sizeof(*ip6); 312 in6_delayed_cksum(m, plen, sizeof(struct ip6_hdr)); 313 m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA_IPV6; 314 } 315#ifdef SCTP 316 if (m->m_pkthdr.csum_flags & CSUM_SCTP_IPV6) { 317 sctp_delayed_cksum(m, sizeof(struct ip6_hdr)); 318 m->m_pkthdr.csum_flags &= ~CSUM_SCTP_IPV6; 319 } 320#endif 321 case 0: /* No IPSec */ 322 default: 323 break; 324 } 325#endif /* IPSEC */ 326 327 /* 328 * Calculate the total length of the extension header chain. 329 * Keep the length of the unfragmentable part for fragmentation. 330 */ 331 optlen = 0; 332 if (exthdrs.ip6e_hbh) 333 optlen += exthdrs.ip6e_hbh->m_len; 334 if (exthdrs.ip6e_dest1) 335 optlen += exthdrs.ip6e_dest1->m_len; 336 if (exthdrs.ip6e_rthdr) 337 optlen += exthdrs.ip6e_rthdr->m_len; 338 unfragpartlen = optlen + sizeof(struct ip6_hdr); 339 340 /* NOTE: we don't add AH/ESP length here. do that later. */ 341 if (exthdrs.ip6e_dest2) 342 optlen += exthdrs.ip6e_dest2->m_len; 343 344 /* 345 * If we need IPsec, or there is at least one extension header, 346 * separate IP6 header from the payload. 347 */ 348 if ((needipsec || optlen) && !hdrsplit) { 349 if ((error = ip6_splithdr(m, &exthdrs)) != 0) { 350 m = NULL; 351 goto freehdrs; 352 } 353 m = exthdrs.ip6e_ip6; 354 hdrsplit++; 355 } 356 357 /* adjust pointer */ 358 ip6 = mtod(m, struct ip6_hdr *); 359 360 /* adjust mbuf packet header length */ 361 m->m_pkthdr.len += optlen; 362 plen = m->m_pkthdr.len - sizeof(*ip6); 363 364 /* If this is a jumbo payload, insert a jumbo payload option. */ 365 if (plen > IPV6_MAXPACKET) { 366 if (!hdrsplit) { 367 if ((error = ip6_splithdr(m, &exthdrs)) != 0) { 368 m = NULL; 369 goto freehdrs; 370 } 371 m = exthdrs.ip6e_ip6; 372 hdrsplit++; 373 } 374 /* adjust pointer */ 375 ip6 = mtod(m, struct ip6_hdr *); 376 if ((error = ip6_insert_jumboopt(&exthdrs, plen)) != 0) 377 goto freehdrs; 378 ip6->ip6_plen = 0; 379 } else 380 ip6->ip6_plen = htons(plen); 381 382 /* 383 * Concatenate headers and fill in next header fields. 384 * Here we have, on "m" 385 * IPv6 payload 386 * and we insert headers accordingly. Finally, we should be getting: 387 * IPv6 hbh dest1 rthdr ah* [esp* dest2 payload] 388 * 389 * during the header composing process, "m" points to IPv6 header. 390 * "mprev" points to an extension header prior to esp. 391 */ 392 u_char *nexthdrp = &ip6->ip6_nxt; 393 mprev = m; 394 395 /* 396 * we treat dest2 specially. this makes IPsec processing 397 * much easier. the goal here is to make mprev point the 398 * mbuf prior to dest2. 399 * 400 * result: IPv6 dest2 payload 401 * m and mprev will point to IPv6 header. 402 */ 403 if (exthdrs.ip6e_dest2) { 404 if (!hdrsplit) 405 panic("assumption failed: hdr not split"); 406 exthdrs.ip6e_dest2->m_next = m->m_next; 407 m->m_next = exthdrs.ip6e_dest2; 408 *mtod(exthdrs.ip6e_dest2, u_char *) = ip6->ip6_nxt; 409 ip6->ip6_nxt = IPPROTO_DSTOPTS; 410 } 411 412 /* 413 * result: IPv6 hbh dest1 rthdr dest2 payload 414 * m will point to IPv6 header. mprev will point to the 415 * extension header prior to dest2 (rthdr in the above case). 416 */ 417 MAKE_CHAIN(exthdrs.ip6e_hbh, mprev, nexthdrp, IPPROTO_HOPOPTS); 418 MAKE_CHAIN(exthdrs.ip6e_dest1, mprev, nexthdrp, 419 IPPROTO_DSTOPTS); 420 MAKE_CHAIN(exthdrs.ip6e_rthdr, mprev, nexthdrp, 421 IPPROTO_ROUTING); 422 423#ifdef IPSEC 424 if (!needipsec) 425 goto skip_ipsec2; 426 427 /* 428 * pointers after IPsec headers are not valid any more. 429 * other pointers need a great care too. 430 * (IPsec routines should not mangle mbufs prior to AH/ESP) 431 */ 432 exthdrs.ip6e_dest2 = NULL; 433 434 if (exthdrs.ip6e_rthdr) { 435 rh = mtod(exthdrs.ip6e_rthdr, struct ip6_rthdr *); 436 segleft_org = rh->ip6r_segleft; 437 rh->ip6r_segleft = 0; 438 } 439 440 bzero(&state, sizeof(state)); 441 state.m = m; 442 error = ipsec6_output_trans(&state, nexthdrp, mprev, sp, flags, 443 &needipsectun); 444 m = state.m; 445 if (error == EJUSTRETURN) { 446 /* 447 * We had a SP with a level of 'use' and no SA. We 448 * will just continue to process the packet without 449 * IPsec processing. 450 */ 451 ; 452 } else if (error) { 453 /* mbuf is already reclaimed in ipsec6_output_trans. */ 454 m = NULL; 455 switch (error) { 456 case EHOSTUNREACH: 457 case ENETUNREACH: 458 case EMSGSIZE: 459 case ENOBUFS: 460 case ENOMEM: 461 break; 462 default: 463 printf("[%s:%d] (ipsec): error code %d\n", 464 __func__, __LINE__, error); 465 /* FALLTHROUGH */ 466 case ENOENT: 467 /* don't show these error codes to the user */ 468 error = 0; 469 break; 470 } 471 goto bad; 472 } else if (!needipsectun) { 473 /* 474 * In the FAST IPSec case we have already 475 * re-injected the packet and it has been freed 476 * by the ipsec_done() function. So, just clean 477 * up after ourselves. 478 */ 479 m = NULL; 480 goto done; 481 } 482 if (exthdrs.ip6e_rthdr) { 483 /* ah6_output doesn't modify mbuf chain */ 484 rh->ip6r_segleft = segleft_org; 485 } 486skip_ipsec2:; 487#endif /* IPSEC */ 488 489 /* 490 * If there is a routing header, discard the packet. 491 */ 492 if (exthdrs.ip6e_rthdr) { 493 error = EINVAL; 494 goto bad; 495 } 496 497 /* Source address validation */ 498 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) && 499 (flags & IPV6_UNSPECSRC) == 0) { 500 error = EOPNOTSUPP; 501 V_ip6stat.ip6s_badscope++; 502 goto bad; 503 } 504 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src)) { 505 error = EOPNOTSUPP; 506 V_ip6stat.ip6s_badscope++; 507 goto bad; 508 } 509 510 V_ip6stat.ip6s_localout++; 511 512 /* 513 * Route packet. 514 */ 515 if (ro == 0) { 516 ro = &ip6route; 517 bzero((caddr_t)ro, sizeof(*ro)); 518 } 519 ro_pmtu = ro; 520 if (opt && opt->ip6po_rthdr) 521 ro = &opt->ip6po_route; 522 dst = (struct sockaddr_in6 *)&ro->ro_dst; 523#ifdef FLOWTABLE 524 if (ro->ro_rt == NULL) { 525 struct flentry *fle; 526 527 /* 528 * The flow table returns route entries valid for up to 30 529 * seconds; we rely on the remainder of ip_output() taking no 530 * longer than that long for the stability of ro_rt. The 531 * flow ID assignment must have happened before this point. 532 */ 533 fle = flowtable_lookup_mbuf(V_ip6_ft, m, AF_INET6); 534 if (fle != NULL) 535 flow_to_route_in6(fle, ro); 536 } 537#endif 538again: 539 /* 540 * if specified, try to fill in the traffic class field. 541 * do not override if a non-zero value is already set. 542 * we check the diffserv field and the ecn field separately. 543 */ 544 if (opt && opt->ip6po_tclass >= 0) { 545 int mask = 0; 546 547 if ((ip6->ip6_flow & htonl(0xfc << 20)) == 0) 548 mask |= 0xfc; 549 if ((ip6->ip6_flow & htonl(0x03 << 20)) == 0) 550 mask |= 0x03; 551 if (mask != 0) 552 ip6->ip6_flow |= htonl((opt->ip6po_tclass & mask) << 20); 553 } 554 555 /* fill in or override the hop limit field, if necessary. */ 556 if (opt && opt->ip6po_hlim != -1) 557 ip6->ip6_hlim = opt->ip6po_hlim & 0xff; 558 else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 559 if (im6o != NULL) 560 ip6->ip6_hlim = im6o->im6o_multicast_hlim; 561 else 562 ip6->ip6_hlim = V_ip6_defmcasthlim; 563 } 564 565#ifdef IPSEC 566 /* 567 * We may re-inject packets into the stack here. 568 */ 569 if (needipsec && needipsectun) { 570 struct ipsec_output_state state; 571 572 /* 573 * All the extension headers will become inaccessible 574 * (since they can be encrypted). 575 * Don't panic, we need no more updates to extension headers 576 * on inner IPv6 packet (since they are now encapsulated). 577 * 578 * IPv6 [ESP|AH] IPv6 [extension headers] payload 579 */ 580 bzero(&exthdrs, sizeof(exthdrs)); 581 exthdrs.ip6e_ip6 = m; 582 583 bzero(&state, sizeof(state)); 584 state.m = m; 585 state.ro = (struct route *)ro; 586 state.dst = (struct sockaddr *)dst; 587 588 error = ipsec6_output_tunnel(&state, sp, flags); 589 590 m = state.m; 591 ro = (struct route_in6 *)state.ro; 592 dst = (struct sockaddr_in6 *)state.dst; 593 if (error == EJUSTRETURN) { 594 /* 595 * We had a SP with a level of 'use' and no SA. We 596 * will just continue to process the packet without 597 * IPsec processing. 598 */ 599 ; 600 } else if (error) { 601 /* mbuf is already reclaimed in ipsec6_output_tunnel. */ 602 m0 = m = NULL; 603 m = NULL; 604 switch (error) { 605 case EHOSTUNREACH: 606 case ENETUNREACH: 607 case EMSGSIZE: 608 case ENOBUFS: 609 case ENOMEM: 610 break; 611 default: 612 printf("[%s:%d] (ipsec): error code %d\n", 613 __func__, __LINE__, error); 614 /* FALLTHROUGH */ 615 case ENOENT: 616 /* don't show these error codes to the user */ 617 error = 0; 618 break; 619 } 620 goto bad; 621 } else { 622 /* 623 * In the FAST IPSec case we have already 624 * re-injected the packet and it has been freed 625 * by the ipsec_done() function. So, just clean 626 * up after ourselves. 627 */ 628 m = NULL; 629 goto done; 630 } 631 632 exthdrs.ip6e_ip6 = m; 633 } 634#endif /* IPSEC */ 635 636 /* adjust pointer */ 637 ip6 = mtod(m, struct ip6_hdr *); 638 639 bzero(&dst_sa, sizeof(dst_sa)); 640 dst_sa.sin6_family = AF_INET6; 641 dst_sa.sin6_len = sizeof(dst_sa); 642 dst_sa.sin6_addr = ip6->ip6_dst; 643 if (ro->ro_rt) { 644 rt = ro->ro_rt; 645 ifp = ro->ro_rt->rt_ifp; 646 } else if ((error = in6_selectroute_fib(&dst_sa, opt, im6o, ro, 647 &ifp, &rt, inp ? inp->inp_inc.inc_fibnum : M_GETFIB(m))) != 0) { 648 switch (error) { 649 case EHOSTUNREACH: 650 V_ip6stat.ip6s_noroute++; 651 break; 652 case EADDRNOTAVAIL: 653 default: 654 break; /* XXX statistics? */ 655 } 656 if (ifp != NULL) 657 in6_ifstat_inc(ifp, ifs6_out_discard); 658 goto bad; 659 } 660 if (rt == NULL) { 661 /* 662 * If in6_selectroute() does not return a route entry, 663 * dst may not have been updated. 664 */ 665 *dst = dst_sa; /* XXX */ 666 } 667 668 /* 669 * then rt (for unicast) and ifp must be non-NULL valid values. 670 */ 671 if ((flags & IPV6_FORWARDING) == 0) { 672 /* XXX: the FORWARDING flag can be set for mrouting. */ 673 in6_ifstat_inc(ifp, ifs6_out_request); 674 } 675 if (rt != NULL) { 676 ia = (struct in6_ifaddr *)(rt->rt_ifa); 677 rt->rt_use++; 678 } 679 680 681 /* 682 * The outgoing interface must be in the zone of source and 683 * destination addresses. 684 */ 685 origifp = ifp; 686 687 src0 = ip6->ip6_src; 688 if (in6_setscope(&src0, origifp, &zone)) 689 goto badscope; 690 bzero(&src_sa, sizeof(src_sa)); 691 src_sa.sin6_family = AF_INET6; 692 src_sa.sin6_len = sizeof(src_sa); 693 src_sa.sin6_addr = ip6->ip6_src; 694 if (sa6_recoverscope(&src_sa) || zone != src_sa.sin6_scope_id) 695 goto badscope; 696 697 dst0 = ip6->ip6_dst; 698 if (in6_setscope(&dst0, origifp, &zone)) 699 goto badscope; 700 /* re-initialize to be sure */ 701 bzero(&dst_sa, sizeof(dst_sa)); 702 dst_sa.sin6_family = AF_INET6; 703 dst_sa.sin6_len = sizeof(dst_sa); 704 dst_sa.sin6_addr = ip6->ip6_dst; 705 if (sa6_recoverscope(&dst_sa) || zone != dst_sa.sin6_scope_id) { 706 goto badscope; 707 } 708 709 /* We should use ia_ifp to support the case of 710 * sending packets to an address of our own. 711 */ 712 if (ia != NULL && ia->ia_ifp) 713 ifp = ia->ia_ifp; 714 715 /* scope check is done. */ 716 goto routefound; 717 718 badscope: 719 V_ip6stat.ip6s_badscope++; 720 in6_ifstat_inc(origifp, ifs6_out_discard); 721 if (error == 0) 722 error = EHOSTUNREACH; /* XXX */ 723 goto bad; 724 725 routefound: 726 if (rt && !IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 727 if (opt && opt->ip6po_nextroute.ro_rt) { 728 /* 729 * The nexthop is explicitly specified by the 730 * application. We assume the next hop is an IPv6 731 * address. 732 */ 733 dst = (struct sockaddr_in6 *)opt->ip6po_nexthop; 734 } 735 else if ((rt->rt_flags & RTF_GATEWAY)) 736 dst = (struct sockaddr_in6 *)rt->rt_gateway; 737 } 738 739 if (!IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 740 m->m_flags &= ~(M_BCAST | M_MCAST); /* just in case */ 741 } else { 742 m->m_flags = (m->m_flags & ~M_BCAST) | M_MCAST; 743 in6_ifstat_inc(ifp, ifs6_out_mcast); 744 /* 745 * Confirm that the outgoing interface supports multicast. 746 */ 747 if (!(ifp->if_flags & IFF_MULTICAST)) { 748 V_ip6stat.ip6s_noroute++; 749 in6_ifstat_inc(ifp, ifs6_out_discard); 750 error = ENETUNREACH; 751 goto bad; 752 } 753 if ((im6o == NULL && in6_mcast_loop) || 754 (im6o && im6o->im6o_multicast_loop)) { 755 /* 756 * Loop back multicast datagram if not expressly 757 * forbidden to do so, even if we have not joined 758 * the address; protocols will filter it later, 759 * thus deferring a hash lookup and lock acquisition 760 * at the expense of an m_copym(). 761 */ 762 ip6_mloopback(ifp, m, dst); 763 } else { 764 /* 765 * If we are acting as a multicast router, perform 766 * multicast forwarding as if the packet had just 767 * arrived on the interface to which we are about 768 * to send. The multicast forwarding function 769 * recursively calls this function, using the 770 * IPV6_FORWARDING flag to prevent infinite recursion. 771 * 772 * Multicasts that are looped back by ip6_mloopback(), 773 * above, will be forwarded by the ip6_input() routine, 774 * if necessary. 775 */ 776 if (V_ip6_mrouter && (flags & IPV6_FORWARDING) == 0) { 777 /* 778 * XXX: ip6_mforward expects that rcvif is NULL 779 * when it is called from the originating path. 780 * However, it is not always the case, since 781 * some versions of MGETHDR() does not 782 * initialize the field. 783 */ 784 m->m_pkthdr.rcvif = NULL; 785 if (ip6_mforward(ip6, ifp, m) != 0) { 786 m_freem(m); 787 goto done; 788 } 789 } 790 } 791 /* 792 * Multicasts with a hoplimit of zero may be looped back, 793 * above, but must not be transmitted on a network. 794 * Also, multicasts addressed to the loopback interface 795 * are not sent -- the above call to ip6_mloopback() will 796 * loop back a copy if this host actually belongs to the 797 * destination group on the loopback interface. 798 */ 799 if (ip6->ip6_hlim == 0 || (ifp->if_flags & IFF_LOOPBACK) || 800 IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst)) { 801 m_freem(m); 802 goto done; 803 } 804 } 805 806 /* 807 * Fill the outgoing inteface to tell the upper layer 808 * to increment per-interface statistics. 809 */ 810 if (ifpp) 811 *ifpp = ifp; 812 813 /* Determine path MTU. */ 814 if ((error = ip6_getpmtu(ro_pmtu, ro, ifp, &finaldst, &mtu, 815 &alwaysfrag, inp ? inp->inp_inc.inc_fibnum : M_GETFIB(m))) != 0) 816 goto bad; 817 818 /* 819 * The caller of this function may specify to use the minimum MTU 820 * in some cases. 821 * An advanced API option (IPV6_USE_MIN_MTU) can also override MTU 822 * setting. The logic is a bit complicated; by default, unicast 823 * packets will follow path MTU while multicast packets will be sent at 824 * the minimum MTU. If IP6PO_MINMTU_ALL is specified, all packets 825 * including unicast ones will be sent at the minimum MTU. Multicast 826 * packets will always be sent at the minimum MTU unless 827 * IP6PO_MINMTU_DISABLE is explicitly specified. 828 * See RFC 3542 for more details. 829 */ 830 if (mtu > IPV6_MMTU) { 831 if ((flags & IPV6_MINMTU)) 832 mtu = IPV6_MMTU; 833 else if (opt && opt->ip6po_minmtu == IP6PO_MINMTU_ALL) 834 mtu = IPV6_MMTU; 835 else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) && 836 (opt == NULL || 837 opt->ip6po_minmtu != IP6PO_MINMTU_DISABLE)) { 838 mtu = IPV6_MMTU; 839 } 840 } 841 842 /* 843 * clear embedded scope identifiers if necessary. 844 * in6_clearscope will touch the addresses only when necessary. 845 */ 846 in6_clearscope(&ip6->ip6_src); 847 in6_clearscope(&ip6->ip6_dst); 848 849 /* 850 * If the outgoing packet contains a hop-by-hop options header, 851 * it must be examined and processed even by the source node. 852 * (RFC 2460, section 4.) 853 */ 854 if (exthdrs.ip6e_hbh) { 855 struct ip6_hbh *hbh = mtod(exthdrs.ip6e_hbh, struct ip6_hbh *); 856 u_int32_t dummy; /* XXX unused */ 857 u_int32_t plen = 0; /* XXX: ip6_process will check the value */ 858 859#ifdef DIAGNOSTIC 860 if ((hbh->ip6h_len + 1) << 3 > exthdrs.ip6e_hbh->m_len) 861 panic("ip6e_hbh is not contiguous"); 862#endif 863 /* 864 * XXX: if we have to send an ICMPv6 error to the sender, 865 * we need the M_LOOP flag since icmp6_error() expects 866 * the IPv6 and the hop-by-hop options header are 867 * contiguous unless the flag is set. 868 */ 869 m->m_flags |= M_LOOP; 870 m->m_pkthdr.rcvif = ifp; 871 if (ip6_process_hopopts(m, (u_int8_t *)(hbh + 1), 872 ((hbh->ip6h_len + 1) << 3) - sizeof(struct ip6_hbh), 873 &dummy, &plen) < 0) { 874 /* m was already freed at this point */ 875 error = EINVAL;/* better error? */ 876 goto done; 877 } 878 m->m_flags &= ~M_LOOP; /* XXX */ 879 m->m_pkthdr.rcvif = NULL; 880 } 881 882 /* Jump over all PFIL processing if hooks are not active. */ 883 if (!PFIL_HOOKED(&V_inet6_pfil_hook)) 884 goto passout; 885 886 odst = ip6->ip6_dst; 887 /* Run through list of hooks for output packets. */ 888 error = pfil_run_hooks(&V_inet6_pfil_hook, &m, ifp, PFIL_OUT, inp); 889 if (error != 0 || m == NULL) 890 goto done; 891 ip6 = mtod(m, struct ip6_hdr *); 892 893 /* See if destination IP address was changed by packet filter. */ 894 if (!IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst)) { 895 m->m_flags |= M_SKIP_FIREWALL; 896 /* If destination is now ourself drop to ip6_input(). */ 897 if (in6_localip(&ip6->ip6_dst)) { 898 m->m_flags |= M_FASTFWD_OURS; 899 if (m->m_pkthdr.rcvif == NULL) 900 m->m_pkthdr.rcvif = V_loif; 901 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6) { 902 m->m_pkthdr.csum_flags |= 903 CSUM_DATA_VALID_IPV6 | CSUM_PSEUDO_HDR; 904 m->m_pkthdr.csum_data = 0xffff; 905 } 906#ifdef SCTP 907 if (m->m_pkthdr.csum_flags & CSUM_SCTP_IPV6) 908 m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID; 909#endif 910 error = netisr_queue(NETISR_IPV6, m); 911 goto done; 912 } else 913 goto again; /* Redo the routing table lookup. */ 914 } 915 916 if (V_pfilforward == 0) 917 goto passout; 918 /* See if local, if yes, send it to netisr. */ 919 if (m->m_flags & M_FASTFWD_OURS) { 920 if (m->m_pkthdr.rcvif == NULL) 921 m->m_pkthdr.rcvif = V_loif; 922 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6) { 923 m->m_pkthdr.csum_flags |= 924 CSUM_DATA_VALID_IPV6 | CSUM_PSEUDO_HDR; 925 m->m_pkthdr.csum_data = 0xffff; 926 } 927#ifdef SCTP 928 if (m->m_pkthdr.csum_flags & CSUM_SCTP_IPV6) 929 m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID; 930#endif 931 error = netisr_queue(NETISR_IPV6, m); 932 goto done; 933 } 934 /* Or forward to some other address? */ 935 fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL); 936 if (fwd_tag) { 937 dst = (struct sockaddr_in6 *)&ro->ro_dst; 938 bcopy((fwd_tag+1), dst, sizeof(struct sockaddr_in6)); 939 m->m_flags |= M_SKIP_FIREWALL; 940 m_tag_delete(m, fwd_tag); 941 goto again; 942 } 943 944passout: 945 /* 946 * Send the packet to the outgoing interface. 947 * If necessary, do IPv6 fragmentation before sending. 948 * 949 * the logic here is rather complex: 950 * 1: normal case (dontfrag == 0, alwaysfrag == 0) 951 * 1-a: send as is if tlen <= path mtu 952 * 1-b: fragment if tlen > path mtu 953 * 954 * 2: if user asks us not to fragment (dontfrag == 1) 955 * 2-a: send as is if tlen <= interface mtu 956 * 2-b: error if tlen > interface mtu 957 * 958 * 3: if we always need to attach fragment header (alwaysfrag == 1) 959 * always fragment 960 * 961 * 4: if dontfrag == 1 && alwaysfrag == 1 962 * error, as we cannot handle this conflicting request 963 */ 964 sw_csum = m->m_pkthdr.csum_flags; 965 if (!hdrsplit) { 966 tso = ((sw_csum & ifp->if_hwassist & CSUM_TSO) != 0) ? 1 : 0; 967 sw_csum &= ~ifp->if_hwassist; 968 } else 969 tso = 0; 970 /* 971 * If we added extension headers, we will not do TSO and calculate the 972 * checksums ourselves for now. 973 * XXX-BZ Need a framework to know when the NIC can handle it, even 974 * with ext. hdrs. 975 */ 976 if (sw_csum & CSUM_DELAY_DATA_IPV6) { 977 sw_csum &= ~CSUM_DELAY_DATA_IPV6; 978 in6_delayed_cksum(m, plen, sizeof(struct ip6_hdr)); 979 } 980#ifdef SCTP 981 if (sw_csum & CSUM_SCTP_IPV6) { 982 sw_csum &= ~CSUM_SCTP_IPV6; 983 sctp_delayed_cksum(m, sizeof(struct ip6_hdr)); 984 } 985#endif 986 m->m_pkthdr.csum_flags &= ifp->if_hwassist; 987 tlen = m->m_pkthdr.len; 988 989 if ((opt && (opt->ip6po_flags & IP6PO_DONTFRAG)) || tso) 990 dontfrag = 1; 991 else 992 dontfrag = 0; 993 if (dontfrag && alwaysfrag) { /* case 4 */ 994 /* conflicting request - can't transmit */ 995 error = EMSGSIZE; 996 goto bad; 997 } 998 if (dontfrag && tlen > IN6_LINKMTU(ifp) && !tso) { /* case 2-b */ 999 /* 1000 * Even if the DONTFRAG option is specified, we cannot send the 1001 * packet when the data length is larger than the MTU of the 1002 * outgoing interface. 1003 * Notify the error by sending IPV6_PATHMTU ancillary data as 1004 * well as returning an error code (the latter is not described 1005 * in the API spec.) 1006 */ 1007 u_int32_t mtu32; 1008 struct ip6ctlparam ip6cp; 1009 1010 mtu32 = (u_int32_t)mtu; 1011 bzero(&ip6cp, sizeof(ip6cp)); 1012 ip6cp.ip6c_cmdarg = (void *)&mtu32; 1013 pfctlinput2(PRC_MSGSIZE, (struct sockaddr *)&ro_pmtu->ro_dst, 1014 (void *)&ip6cp); 1015 1016 error = EMSGSIZE; 1017 goto bad; 1018 } 1019 1020 /* 1021 * transmit packet without fragmentation 1022 */ 1023 if (dontfrag || (!alwaysfrag && tlen <= mtu)) { /* case 1-a and 2-a */ 1024 struct in6_ifaddr *ia6; 1025 1026 ip6 = mtod(m, struct ip6_hdr *); 1027 ia6 = in6_ifawithifp(ifp, &ip6->ip6_src); 1028 if (ia6) { 1029 /* Record statistics for this interface address. */ 1030 ia6->ia_ifa.if_opackets++; 1031 ia6->ia_ifa.if_obytes += m->m_pkthdr.len; 1032 ifa_free(&ia6->ia_ifa); 1033 } 1034 error = nd6_output(ifp, origifp, m, dst, ro->ro_rt); 1035 goto done; 1036 } 1037 1038 /* 1039 * try to fragment the packet. case 1-b and 3 1040 */ 1041 if (mtu < IPV6_MMTU) { 1042 /* path MTU cannot be less than IPV6_MMTU */ 1043 error = EMSGSIZE; 1044 in6_ifstat_inc(ifp, ifs6_out_fragfail); 1045 goto bad; 1046 } else if (ip6->ip6_plen == 0) { 1047 /* jumbo payload cannot be fragmented */ 1048 error = EMSGSIZE; 1049 in6_ifstat_inc(ifp, ifs6_out_fragfail); 1050 goto bad; 1051 } else { 1052 struct mbuf **mnext, *m_frgpart; 1053 struct ip6_frag *ip6f; 1054 u_int32_t id = htonl(ip6_randomid()); 1055 u_char nextproto; 1056 1057 int qslots = ifp->if_snd.ifq_maxlen - ifp->if_snd.ifq_len; 1058 1059 /* 1060 * Too large for the destination or interface; 1061 * fragment if possible. 1062 * Must be able to put at least 8 bytes per fragment. 1063 */ 1064 hlen = unfragpartlen; 1065 if (mtu > IPV6_MAXPACKET) 1066 mtu = IPV6_MAXPACKET; 1067 1068 len = (mtu - hlen - sizeof(struct ip6_frag)) & ~7; 1069 if (len < 8) { 1070 error = EMSGSIZE; 1071 in6_ifstat_inc(ifp, ifs6_out_fragfail); 1072 goto bad; 1073 } 1074 1075 /* 1076 * Verify that we have any chance at all of being able to queue 1077 * the packet or packet fragments 1078 */ 1079 if (qslots <= 0 || ((u_int)qslots * (mtu - hlen) 1080 < tlen /* - hlen */)) { 1081 error = ENOBUFS; 1082 V_ip6stat.ip6s_odropped++; 1083 goto bad; 1084 } 1085 1086 1087 /* 1088 * If the interface will not calculate checksums on 1089 * fragmented packets, then do it here. 1090 * XXX-BZ handle the hw offloading case. Need flags. 1091 */ 1092 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6) { 1093 in6_delayed_cksum(m, plen, hlen); 1094 m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA_IPV6; 1095 } 1096#ifdef SCTP 1097 if (m->m_pkthdr.csum_flags & CSUM_SCTP_IPV6) { 1098 sctp_delayed_cksum(m, hlen); 1099 m->m_pkthdr.csum_flags &= ~CSUM_SCTP_IPV6; 1100 } 1101#endif 1102 mnext = &m->m_nextpkt; 1103 1104 /* 1105 * Change the next header field of the last header in the 1106 * unfragmentable part. 1107 */ 1108 if (exthdrs.ip6e_rthdr) { 1109 nextproto = *mtod(exthdrs.ip6e_rthdr, u_char *); 1110 *mtod(exthdrs.ip6e_rthdr, u_char *) = IPPROTO_FRAGMENT; 1111 } else if (exthdrs.ip6e_dest1) { 1112 nextproto = *mtod(exthdrs.ip6e_dest1, u_char *); 1113 *mtod(exthdrs.ip6e_dest1, u_char *) = IPPROTO_FRAGMENT; 1114 } else if (exthdrs.ip6e_hbh) { 1115 nextproto = *mtod(exthdrs.ip6e_hbh, u_char *); 1116 *mtod(exthdrs.ip6e_hbh, u_char *) = IPPROTO_FRAGMENT; 1117 } else { 1118 nextproto = ip6->ip6_nxt; 1119 ip6->ip6_nxt = IPPROTO_FRAGMENT; 1120 } 1121 1122 /* 1123 * Loop through length of segment after first fragment, 1124 * make new header and copy data of each part and link onto 1125 * chain. 1126 */ 1127 m0 = m; 1128 for (off = hlen; off < tlen; off += len) { 1129 MGETHDR(m, M_DONTWAIT, MT_HEADER); 1130 if (!m) { 1131 error = ENOBUFS; 1132 V_ip6stat.ip6s_odropped++; 1133 goto sendorfree; 1134 } 1135 m->m_pkthdr.rcvif = NULL; 1136 m->m_flags = m0->m_flags & M_COPYFLAGS; /* incl. FIB */ 1137 *mnext = m; 1138 mnext = &m->m_nextpkt; 1139 m->m_data += max_linkhdr; 1140 mhip6 = mtod(m, struct ip6_hdr *); 1141 *mhip6 = *ip6; 1142 m->m_len = sizeof(*mhip6); 1143 error = ip6_insertfraghdr(m0, m, hlen, &ip6f); 1144 if (error) { 1145 V_ip6stat.ip6s_odropped++; 1146 goto sendorfree; 1147 } 1148 ip6f->ip6f_offlg = htons((u_short)((off - hlen) & ~7)); 1149 if (off + len >= tlen) 1150 len = tlen - off; 1151 else 1152 ip6f->ip6f_offlg |= IP6F_MORE_FRAG; 1153 mhip6->ip6_plen = htons((u_short)(len + hlen + 1154 sizeof(*ip6f) - sizeof(struct ip6_hdr))); 1155 if ((m_frgpart = m_copy(m0, off, len)) == 0) { 1156 error = ENOBUFS; 1157 V_ip6stat.ip6s_odropped++; 1158 goto sendorfree; 1159 } 1160 m_cat(m, m_frgpart); 1161 m->m_pkthdr.len = len + hlen + sizeof(*ip6f); 1162 m->m_pkthdr.rcvif = NULL; 1163 ip6f->ip6f_reserved = 0; 1164 ip6f->ip6f_ident = id; 1165 ip6f->ip6f_nxt = nextproto; 1166 V_ip6stat.ip6s_ofragments++; 1167 in6_ifstat_inc(ifp, ifs6_out_fragcreat); 1168 } 1169 1170 in6_ifstat_inc(ifp, ifs6_out_fragok); 1171 } 1172 1173 /* 1174 * Remove leading garbages. 1175 */ 1176sendorfree: 1177 m = m0->m_nextpkt; 1178 m0->m_nextpkt = 0; 1179 m_freem(m0); 1180 for (m0 = m; m; m = m0) { 1181 m0 = m->m_nextpkt; 1182 m->m_nextpkt = 0; 1183 if (error == 0) { 1184 /* Record statistics for this interface address. */ 1185 if (ia) { 1186 ia->ia_ifa.if_opackets++; 1187 ia->ia_ifa.if_obytes += m->m_pkthdr.len; 1188 } 1189 error = nd6_output(ifp, origifp, m, dst, ro->ro_rt); 1190 } else 1191 m_freem(m); 1192 } 1193 1194 if (error == 0) 1195 V_ip6stat.ip6s_fragmented++; 1196 1197done: 1198 if (ro == &ip6route) 1199 RO_RTFREE(ro); 1200 if (ro_pmtu == &ip6route) 1201 RO_RTFREE(ro_pmtu); 1202#ifdef IPSEC 1203 if (sp != NULL) 1204 KEY_FREESP(&sp); 1205#endif 1206 1207 return (error); 1208 1209freehdrs: 1210 m_freem(exthdrs.ip6e_hbh); /* m_freem will check if mbuf is 0 */ 1211 m_freem(exthdrs.ip6e_dest1); 1212 m_freem(exthdrs.ip6e_rthdr); 1213 m_freem(exthdrs.ip6e_dest2); 1214 /* FALLTHROUGH */ 1215bad: 1216 if (m) 1217 m_freem(m); 1218 goto done; 1219} 1220 1221static int 1222ip6_copyexthdr(struct mbuf **mp, caddr_t hdr, int hlen) 1223{ 1224 struct mbuf *m; 1225 1226 if (hlen > MCLBYTES) 1227 return (ENOBUFS); /* XXX */ 1228 1229 MGET(m, M_DONTWAIT, MT_DATA); 1230 if (!m) 1231 return (ENOBUFS); 1232 1233 if (hlen > MLEN) { 1234 MCLGET(m, M_DONTWAIT); 1235 if ((m->m_flags & M_EXT) == 0) { 1236 m_free(m); 1237 return (ENOBUFS); 1238 } 1239 } 1240 m->m_len = hlen; 1241 if (hdr) 1242 bcopy(hdr, mtod(m, caddr_t), hlen); 1243 1244 *mp = m; 1245 return (0); 1246} 1247 1248/* 1249 * Insert jumbo payload option. 1250 */ 1251static int 1252ip6_insert_jumboopt(struct ip6_exthdrs *exthdrs, u_int32_t plen) 1253{ 1254 struct mbuf *mopt; 1255 u_char *optbuf; 1256 u_int32_t v; 1257 1258#define JUMBOOPTLEN 8 /* length of jumbo payload option and padding */ 1259 1260 /* 1261 * If there is no hop-by-hop options header, allocate new one. 1262 * If there is one but it doesn't have enough space to store the 1263 * jumbo payload option, allocate a cluster to store the whole options. 1264 * Otherwise, use it to store the options. 1265 */ 1266 if (exthdrs->ip6e_hbh == 0) { 1267 MGET(mopt, M_DONTWAIT, MT_DATA); 1268 if (mopt == 0) 1269 return (ENOBUFS); 1270 mopt->m_len = JUMBOOPTLEN; 1271 optbuf = mtod(mopt, u_char *); 1272 optbuf[1] = 0; /* = ((JUMBOOPTLEN) >> 3) - 1 */ 1273 exthdrs->ip6e_hbh = mopt; 1274 } else { 1275 struct ip6_hbh *hbh; 1276 1277 mopt = exthdrs->ip6e_hbh; 1278 if (M_TRAILINGSPACE(mopt) < JUMBOOPTLEN) { 1279 /* 1280 * XXX assumption: 1281 * - exthdrs->ip6e_hbh is not referenced from places 1282 * other than exthdrs. 1283 * - exthdrs->ip6e_hbh is not an mbuf chain. 1284 */ 1285 int oldoptlen = mopt->m_len; 1286 struct mbuf *n; 1287 1288 /* 1289 * XXX: give up if the whole (new) hbh header does 1290 * not fit even in an mbuf cluster. 1291 */ 1292 if (oldoptlen + JUMBOOPTLEN > MCLBYTES) 1293 return (ENOBUFS); 1294 1295 /* 1296 * As a consequence, we must always prepare a cluster 1297 * at this point. 1298 */ 1299 MGET(n, M_DONTWAIT, MT_DATA); 1300 if (n) { 1301 MCLGET(n, M_DONTWAIT); 1302 if ((n->m_flags & M_EXT) == 0) { 1303 m_freem(n); 1304 n = NULL; 1305 } 1306 } 1307 if (!n) 1308 return (ENOBUFS); 1309 n->m_len = oldoptlen + JUMBOOPTLEN; 1310 bcopy(mtod(mopt, caddr_t), mtod(n, caddr_t), 1311 oldoptlen); 1312 optbuf = mtod(n, caddr_t) + oldoptlen; 1313 m_freem(mopt); 1314 mopt = exthdrs->ip6e_hbh = n; 1315 } else { 1316 optbuf = mtod(mopt, u_char *) + mopt->m_len; 1317 mopt->m_len += JUMBOOPTLEN; 1318 } 1319 optbuf[0] = IP6OPT_PADN; 1320 optbuf[1] = 1; 1321 1322 /* 1323 * Adjust the header length according to the pad and 1324 * the jumbo payload option. 1325 */ 1326 hbh = mtod(mopt, struct ip6_hbh *); 1327 hbh->ip6h_len += (JUMBOOPTLEN >> 3); 1328 } 1329 1330 /* fill in the option. */ 1331 optbuf[2] = IP6OPT_JUMBO; 1332 optbuf[3] = 4; 1333 v = (u_int32_t)htonl(plen + JUMBOOPTLEN); 1334 bcopy(&v, &optbuf[4], sizeof(u_int32_t)); 1335 1336 /* finally, adjust the packet header length */ 1337 exthdrs->ip6e_ip6->m_pkthdr.len += JUMBOOPTLEN; 1338 1339 return (0); 1340#undef JUMBOOPTLEN 1341} 1342 1343/* 1344 * Insert fragment header and copy unfragmentable header portions. 1345 */ 1346static int 1347ip6_insertfraghdr(struct mbuf *m0, struct mbuf *m, int hlen, 1348 struct ip6_frag **frghdrp) 1349{ 1350 struct mbuf *n, *mlast; 1351 1352 if (hlen > sizeof(struct ip6_hdr)) { 1353 n = m_copym(m0, sizeof(struct ip6_hdr), 1354 hlen - sizeof(struct ip6_hdr), M_DONTWAIT); 1355 if (n == 0) 1356 return (ENOBUFS); 1357 m->m_next = n; 1358 } else 1359 n = m; 1360 1361 /* Search for the last mbuf of unfragmentable part. */ 1362 for (mlast = n; mlast->m_next; mlast = mlast->m_next) 1363 ; 1364 1365 if ((mlast->m_flags & M_EXT) == 0 && 1366 M_TRAILINGSPACE(mlast) >= sizeof(struct ip6_frag)) { 1367 /* use the trailing space of the last mbuf for the fragment hdr */ 1368 *frghdrp = (struct ip6_frag *)(mtod(mlast, caddr_t) + 1369 mlast->m_len); 1370 mlast->m_len += sizeof(struct ip6_frag); 1371 m->m_pkthdr.len += sizeof(struct ip6_frag); 1372 } else { 1373 /* allocate a new mbuf for the fragment header */ 1374 struct mbuf *mfrg; 1375 1376 MGET(mfrg, M_DONTWAIT, MT_DATA); 1377 if (mfrg == 0) 1378 return (ENOBUFS); 1379 mfrg->m_len = sizeof(struct ip6_frag); 1380 *frghdrp = mtod(mfrg, struct ip6_frag *); 1381 mlast->m_next = mfrg; 1382 } 1383 1384 return (0); 1385} 1386 1387static int 1388ip6_getpmtu(struct route_in6 *ro_pmtu, struct route_in6 *ro, 1389 struct ifnet *ifp, struct in6_addr *dst, u_long *mtup, 1390 int *alwaysfragp, u_int fibnum) 1391{ 1392 u_int32_t mtu = 0; 1393 int alwaysfrag = 0; 1394 int error = 0; 1395 1396 if (ro_pmtu != ro) { 1397 /* The first hop and the final destination may differ. */ 1398 struct sockaddr_in6 *sa6_dst = 1399 (struct sockaddr_in6 *)&ro_pmtu->ro_dst; 1400 if (ro_pmtu->ro_rt && 1401 ((ro_pmtu->ro_rt->rt_flags & RTF_UP) == 0 || 1402 !IN6_ARE_ADDR_EQUAL(&sa6_dst->sin6_addr, dst))) { 1403 RTFREE(ro_pmtu->ro_rt); 1404 ro_pmtu->ro_rt = (struct rtentry *)NULL; 1405 } 1406 if (ro_pmtu->ro_rt == NULL) { 1407 bzero(sa6_dst, sizeof(*sa6_dst)); 1408 sa6_dst->sin6_family = AF_INET6; 1409 sa6_dst->sin6_len = sizeof(struct sockaddr_in6); 1410 sa6_dst->sin6_addr = *dst; 1411 1412 in6_rtalloc(ro_pmtu, fibnum); 1413 } 1414 } 1415 if (ro_pmtu->ro_rt) { 1416 u_int32_t ifmtu; 1417 struct in_conninfo inc; 1418 1419 bzero(&inc, sizeof(inc)); 1420 inc.inc_flags |= INC_ISIPV6; 1421 inc.inc6_faddr = *dst; 1422 1423 if (ifp == NULL) 1424 ifp = ro_pmtu->ro_rt->rt_ifp; 1425 ifmtu = IN6_LINKMTU(ifp); 1426 mtu = tcp_hc_getmtu(&inc); 1427 if (mtu) 1428 mtu = min(mtu, ro_pmtu->ro_rt->rt_rmx.rmx_mtu); 1429 else 1430 mtu = ro_pmtu->ro_rt->rt_rmx.rmx_mtu; 1431 if (mtu == 0) 1432 mtu = ifmtu; 1433 else if (mtu < IPV6_MMTU) { 1434 /* 1435 * RFC2460 section 5, last paragraph: 1436 * if we record ICMPv6 too big message with 1437 * mtu < IPV6_MMTU, transmit packets sized IPV6_MMTU 1438 * or smaller, with framgent header attached. 1439 * (fragment header is needed regardless from the 1440 * packet size, for translators to identify packets) 1441 */ 1442 alwaysfrag = 1; 1443 mtu = IPV6_MMTU; 1444 } else if (mtu > ifmtu) { 1445 /* 1446 * The MTU on the route is larger than the MTU on 1447 * the interface! This shouldn't happen, unless the 1448 * MTU of the interface has been changed after the 1449 * interface was brought up. Change the MTU in the 1450 * route to match the interface MTU (as long as the 1451 * field isn't locked). 1452 */ 1453 mtu = ifmtu; 1454 ro_pmtu->ro_rt->rt_rmx.rmx_mtu = mtu; 1455 } 1456 } else if (ifp) { 1457 mtu = IN6_LINKMTU(ifp); 1458 } else 1459 error = EHOSTUNREACH; /* XXX */ 1460 1461 *mtup = mtu; 1462 if (alwaysfragp) 1463 *alwaysfragp = alwaysfrag; 1464 return (error); 1465} 1466 1467/* 1468 * IP6 socket option processing. 1469 */ 1470int 1471ip6_ctloutput(struct socket *so, struct sockopt *sopt) 1472{ 1473 int optdatalen, uproto; 1474 void *optdata; 1475 struct inpcb *in6p = sotoinpcb(so); 1476 int error, optval; 1477 int level, op, optname; 1478 int optlen; 1479 struct thread *td; 1480 1481 level = sopt->sopt_level; 1482 op = sopt->sopt_dir; 1483 optname = sopt->sopt_name; 1484 optlen = sopt->sopt_valsize; 1485 td = sopt->sopt_td; 1486 error = 0; 1487 optval = 0; 1488 uproto = (int)so->so_proto->pr_protocol; 1489 1490 if (level != IPPROTO_IPV6) { 1491 error = EINVAL; 1492 1493 if (sopt->sopt_level == SOL_SOCKET && 1494 sopt->sopt_dir == SOPT_SET) { 1495 switch (sopt->sopt_name) { 1496 case SO_REUSEADDR: 1497 INP_WLOCK(in6p); 1498 if (IN_MULTICAST(ntohl(in6p->inp_laddr.s_addr))) { 1499 if ((so->so_options & 1500 (SO_REUSEADDR | SO_REUSEPORT)) != 0) 1501 in6p->inp_flags2 |= INP_REUSEPORT; 1502 else 1503 in6p->inp_flags2 &= ~INP_REUSEPORT; 1504 } 1505 INP_WUNLOCK(in6p); 1506 error = 0; 1507 break; 1508 case SO_REUSEPORT: 1509 INP_WLOCK(in6p); 1510 if ((so->so_options & SO_REUSEPORT) != 0) 1511 in6p->inp_flags2 |= INP_REUSEPORT; 1512 else 1513 in6p->inp_flags2 &= ~INP_REUSEPORT; 1514 INP_WUNLOCK(in6p); 1515 error = 0; 1516 break; 1517 case SO_SETFIB: 1518 INP_WLOCK(in6p); 1519 in6p->inp_inc.inc_fibnum = so->so_fibnum; 1520 INP_WUNLOCK(in6p); 1521 error = 0; 1522 break; 1523 default: 1524 break; 1525 } 1526 } 1527 } else { /* level == IPPROTO_IPV6 */ 1528 switch (op) { 1529 1530 case SOPT_SET: 1531 switch (optname) { 1532 case IPV6_2292PKTOPTIONS: 1533#ifdef IPV6_PKTOPTIONS 1534 case IPV6_PKTOPTIONS: 1535#endif 1536 { 1537 struct mbuf *m; 1538 1539 error = soopt_getm(sopt, &m); /* XXX */ 1540 if (error != 0) 1541 break; 1542 error = soopt_mcopyin(sopt, m); /* XXX */ 1543 if (error != 0) 1544 break; 1545 error = ip6_pcbopts(&in6p->in6p_outputopts, 1546 m, so, sopt); 1547 m_freem(m); /* XXX */ 1548 break; 1549 } 1550 1551 /* 1552 * Use of some Hop-by-Hop options or some 1553 * Destination options, might require special 1554 * privilege. That is, normal applications 1555 * (without special privilege) might be forbidden 1556 * from setting certain options in outgoing packets, 1557 * and might never see certain options in received 1558 * packets. [RFC 2292 Section 6] 1559 * KAME specific note: 1560 * KAME prevents non-privileged users from sending or 1561 * receiving ANY hbh/dst options in order to avoid 1562 * overhead of parsing options in the kernel. 1563 */ 1564 case IPV6_RECVHOPOPTS: 1565 case IPV6_RECVDSTOPTS: 1566 case IPV6_RECVRTHDRDSTOPTS: 1567 if (td != NULL) { 1568 error = priv_check(td, 1569 PRIV_NETINET_SETHDROPTS); 1570 if (error) 1571 break; 1572 } 1573 /* FALLTHROUGH */ 1574 case IPV6_UNICAST_HOPS: 1575 case IPV6_HOPLIMIT: 1576 case IPV6_FAITH: 1577 1578 case IPV6_RECVPKTINFO: 1579 case IPV6_RECVHOPLIMIT: 1580 case IPV6_RECVRTHDR: 1581 case IPV6_RECVPATHMTU: 1582 case IPV6_RECVTCLASS: 1583 case IPV6_V6ONLY: 1584 case IPV6_AUTOFLOWLABEL: 1585 case IPV6_BINDANY: 1586 if (optname == IPV6_BINDANY && td != NULL) { 1587 error = priv_check(td, 1588 PRIV_NETINET_BINDANY); 1589 if (error) 1590 break; 1591 } 1592 1593 if (optlen != sizeof(int)) { 1594 error = EINVAL; 1595 break; 1596 } 1597 error = sooptcopyin(sopt, &optval, 1598 sizeof optval, sizeof optval); 1599 if (error) 1600 break; 1601 switch (optname) { 1602 1603 case IPV6_UNICAST_HOPS: 1604 if (optval < -1 || optval >= 256) 1605 error = EINVAL; 1606 else { 1607 /* -1 = kernel default */ 1608 in6p->in6p_hops = optval; 1609 if ((in6p->inp_vflag & 1610 INP_IPV4) != 0) 1611 in6p->inp_ip_ttl = optval; 1612 } 1613 break; 1614#define OPTSET(bit) \ 1615do { \ 1616 INP_WLOCK(in6p); \ 1617 if (optval) \ 1618 in6p->inp_flags |= (bit); \ 1619 else \ 1620 in6p->inp_flags &= ~(bit); \ 1621 INP_WUNLOCK(in6p); \ 1622} while (/*CONSTCOND*/ 0) 1623#define OPTSET2292(bit) \ 1624do { \ 1625 INP_WLOCK(in6p); \ 1626 in6p->inp_flags |= IN6P_RFC2292; \ 1627 if (optval) \ 1628 in6p->inp_flags |= (bit); \ 1629 else \ 1630 in6p->inp_flags &= ~(bit); \ 1631 INP_WUNLOCK(in6p); \ 1632} while (/*CONSTCOND*/ 0) 1633#define OPTBIT(bit) (in6p->inp_flags & (bit) ? 1 : 0) 1634 1635 case IPV6_RECVPKTINFO: 1636 /* cannot mix with RFC2292 */ 1637 if (OPTBIT(IN6P_RFC2292)) { 1638 error = EINVAL; 1639 break; 1640 } 1641 OPTSET(IN6P_PKTINFO); 1642 break; 1643 1644 case IPV6_HOPLIMIT: 1645 { 1646 struct ip6_pktopts **optp; 1647 1648 /* cannot mix with RFC2292 */ 1649 if (OPTBIT(IN6P_RFC2292)) { 1650 error = EINVAL; 1651 break; 1652 } 1653 optp = &in6p->in6p_outputopts; 1654 error = ip6_pcbopt(IPV6_HOPLIMIT, 1655 (u_char *)&optval, sizeof(optval), 1656 optp, (td != NULL) ? td->td_ucred : 1657 NULL, uproto); 1658 break; 1659 } 1660 1661 case IPV6_RECVHOPLIMIT: 1662 /* cannot mix with RFC2292 */ 1663 if (OPTBIT(IN6P_RFC2292)) { 1664 error = EINVAL; 1665 break; 1666 } 1667 OPTSET(IN6P_HOPLIMIT); 1668 break; 1669 1670 case IPV6_RECVHOPOPTS: 1671 /* cannot mix with RFC2292 */ 1672 if (OPTBIT(IN6P_RFC2292)) { 1673 error = EINVAL; 1674 break; 1675 } 1676 OPTSET(IN6P_HOPOPTS); 1677 break; 1678 1679 case IPV6_RECVDSTOPTS: 1680 /* cannot mix with RFC2292 */ 1681 if (OPTBIT(IN6P_RFC2292)) { 1682 error = EINVAL; 1683 break; 1684 } 1685 OPTSET(IN6P_DSTOPTS); 1686 break; 1687 1688 case IPV6_RECVRTHDRDSTOPTS: 1689 /* cannot mix with RFC2292 */ 1690 if (OPTBIT(IN6P_RFC2292)) { 1691 error = EINVAL; 1692 break; 1693 } 1694 OPTSET(IN6P_RTHDRDSTOPTS); 1695 break; 1696 1697 case IPV6_RECVRTHDR: 1698 /* cannot mix with RFC2292 */ 1699 if (OPTBIT(IN6P_RFC2292)) { 1700 error = EINVAL; 1701 break; 1702 } 1703 OPTSET(IN6P_RTHDR); 1704 break; 1705 1706 case IPV6_FAITH: 1707 OPTSET(INP_FAITH); 1708 break; 1709 1710 case IPV6_RECVPATHMTU: 1711 /* 1712 * We ignore this option for TCP 1713 * sockets. 1714 * (RFC3542 leaves this case 1715 * unspecified.) 1716 */ 1717 if (uproto != IPPROTO_TCP) 1718 OPTSET(IN6P_MTU); 1719 break; 1720 1721 case IPV6_V6ONLY: 1722 /* 1723 * make setsockopt(IPV6_V6ONLY) 1724 * available only prior to bind(2). 1725 * see ipng mailing list, Jun 22 2001. 1726 */ 1727 if (in6p->inp_lport || 1728 !IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) { 1729 error = EINVAL; 1730 break; 1731 } 1732 OPTSET(IN6P_IPV6_V6ONLY); 1733 if (optval) 1734 in6p->inp_vflag &= ~INP_IPV4; 1735 else 1736 in6p->inp_vflag |= INP_IPV4; 1737 break; 1738 case IPV6_RECVTCLASS: 1739 /* cannot mix with RFC2292 XXX */ 1740 if (OPTBIT(IN6P_RFC2292)) { 1741 error = EINVAL; 1742 break; 1743 } 1744 OPTSET(IN6P_TCLASS); 1745 break; 1746 case IPV6_AUTOFLOWLABEL: 1747 OPTSET(IN6P_AUTOFLOWLABEL); 1748 break; 1749 1750 case IPV6_BINDANY: 1751 OPTSET(INP_BINDANY); 1752 break; 1753 } 1754 break; 1755 1756 case IPV6_TCLASS: 1757 case IPV6_DONTFRAG: 1758 case IPV6_USE_MIN_MTU: 1759 case IPV6_PREFER_TEMPADDR: 1760 if (optlen != sizeof(optval)) { 1761 error = EINVAL; 1762 break; 1763 } 1764 error = sooptcopyin(sopt, &optval, 1765 sizeof optval, sizeof optval); 1766 if (error) 1767 break; 1768 { 1769 struct ip6_pktopts **optp; 1770 optp = &in6p->in6p_outputopts; 1771 error = ip6_pcbopt(optname, 1772 (u_char *)&optval, sizeof(optval), 1773 optp, (td != NULL) ? td->td_ucred : 1774 NULL, uproto); 1775 break; 1776 } 1777 1778 case IPV6_2292PKTINFO: 1779 case IPV6_2292HOPLIMIT: 1780 case IPV6_2292HOPOPTS: 1781 case IPV6_2292DSTOPTS: 1782 case IPV6_2292RTHDR: 1783 /* RFC 2292 */ 1784 if (optlen != sizeof(int)) { 1785 error = EINVAL; 1786 break; 1787 } 1788 error = sooptcopyin(sopt, &optval, 1789 sizeof optval, sizeof optval); 1790 if (error) 1791 break; 1792 switch (optname) { 1793 case IPV6_2292PKTINFO: 1794 OPTSET2292(IN6P_PKTINFO); 1795 break; 1796 case IPV6_2292HOPLIMIT: 1797 OPTSET2292(IN6P_HOPLIMIT); 1798 break; 1799 case IPV6_2292HOPOPTS: 1800 /* 1801 * Check super-user privilege. 1802 * See comments for IPV6_RECVHOPOPTS. 1803 */ 1804 if (td != NULL) { 1805 error = priv_check(td, 1806 PRIV_NETINET_SETHDROPTS); 1807 if (error) 1808 return (error); 1809 } 1810 OPTSET2292(IN6P_HOPOPTS); 1811 break; 1812 case IPV6_2292DSTOPTS: 1813 if (td != NULL) { 1814 error = priv_check(td, 1815 PRIV_NETINET_SETHDROPTS); 1816 if (error) 1817 return (error); 1818 } 1819 OPTSET2292(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); /* XXX */ 1820 break; 1821 case IPV6_2292RTHDR: 1822 OPTSET2292(IN6P_RTHDR); 1823 break; 1824 } 1825 break; 1826 case IPV6_PKTINFO: 1827 case IPV6_HOPOPTS: 1828 case IPV6_RTHDR: 1829 case IPV6_DSTOPTS: 1830 case IPV6_RTHDRDSTOPTS: 1831 case IPV6_NEXTHOP: 1832 { 1833 /* new advanced API (RFC3542) */ 1834 u_char *optbuf; 1835 u_char optbuf_storage[MCLBYTES]; 1836 int optlen; 1837 struct ip6_pktopts **optp; 1838 1839 /* cannot mix with RFC2292 */ 1840 if (OPTBIT(IN6P_RFC2292)) { 1841 error = EINVAL; 1842 break; 1843 } 1844 1845 /* 1846 * We only ensure valsize is not too large 1847 * here. Further validation will be done 1848 * later. 1849 */ 1850 error = sooptcopyin(sopt, optbuf_storage, 1851 sizeof(optbuf_storage), 0); 1852 if (error) 1853 break; 1854 optlen = sopt->sopt_valsize; 1855 optbuf = optbuf_storage; 1856 optp = &in6p->in6p_outputopts; 1857 error = ip6_pcbopt(optname, optbuf, optlen, 1858 optp, (td != NULL) ? td->td_ucred : NULL, 1859 uproto); 1860 break; 1861 } 1862#undef OPTSET 1863 1864 case IPV6_MULTICAST_IF: 1865 case IPV6_MULTICAST_HOPS: 1866 case IPV6_MULTICAST_LOOP: 1867 case IPV6_JOIN_GROUP: 1868 case IPV6_LEAVE_GROUP: 1869 case IPV6_MSFILTER: 1870 case MCAST_BLOCK_SOURCE: 1871 case MCAST_UNBLOCK_SOURCE: 1872 case MCAST_JOIN_GROUP: 1873 case MCAST_LEAVE_GROUP: 1874 case MCAST_JOIN_SOURCE_GROUP: 1875 case MCAST_LEAVE_SOURCE_GROUP: 1876 error = ip6_setmoptions(in6p, sopt); 1877 break; 1878 1879 case IPV6_PORTRANGE: 1880 error = sooptcopyin(sopt, &optval, 1881 sizeof optval, sizeof optval); 1882 if (error) 1883 break; 1884 1885 INP_WLOCK(in6p); 1886 switch (optval) { 1887 case IPV6_PORTRANGE_DEFAULT: 1888 in6p->inp_flags &= ~(INP_LOWPORT); 1889 in6p->inp_flags &= ~(INP_HIGHPORT); 1890 break; 1891 1892 case IPV6_PORTRANGE_HIGH: 1893 in6p->inp_flags &= ~(INP_LOWPORT); 1894 in6p->inp_flags |= INP_HIGHPORT; 1895 break; 1896 1897 case IPV6_PORTRANGE_LOW: 1898 in6p->inp_flags &= ~(INP_HIGHPORT); 1899 in6p->inp_flags |= INP_LOWPORT; 1900 break; 1901 1902 default: 1903 error = EINVAL; 1904 break; 1905 } 1906 INP_WUNLOCK(in6p); 1907 break; 1908 1909#ifdef IPSEC 1910 case IPV6_IPSEC_POLICY: 1911 { 1912 caddr_t req; 1913 struct mbuf *m; 1914 1915 if ((error = soopt_getm(sopt, &m)) != 0) /* XXX */ 1916 break; 1917 if ((error = soopt_mcopyin(sopt, m)) != 0) /* XXX */ 1918 break; 1919 req = mtod(m, caddr_t); 1920 error = ipsec_set_policy(in6p, optname, req, 1921 m->m_len, (sopt->sopt_td != NULL) ? 1922 sopt->sopt_td->td_ucred : NULL); 1923 m_freem(m); 1924 break; 1925 } 1926#endif /* IPSEC */ 1927 1928 default: 1929 error = ENOPROTOOPT; 1930 break; 1931 } 1932 break; 1933 1934 case SOPT_GET: 1935 switch (optname) { 1936 1937 case IPV6_2292PKTOPTIONS: 1938#ifdef IPV6_PKTOPTIONS 1939 case IPV6_PKTOPTIONS: 1940#endif 1941 /* 1942 * RFC3542 (effectively) deprecated the 1943 * semantics of the 2292-style pktoptions. 1944 * Since it was not reliable in nature (i.e., 1945 * applications had to expect the lack of some 1946 * information after all), it would make sense 1947 * to simplify this part by always returning 1948 * empty data. 1949 */ 1950 sopt->sopt_valsize = 0; 1951 break; 1952 1953 case IPV6_RECVHOPOPTS: 1954 case IPV6_RECVDSTOPTS: 1955 case IPV6_RECVRTHDRDSTOPTS: 1956 case IPV6_UNICAST_HOPS: 1957 case IPV6_RECVPKTINFO: 1958 case IPV6_RECVHOPLIMIT: 1959 case IPV6_RECVRTHDR: 1960 case IPV6_RECVPATHMTU: 1961 1962 case IPV6_FAITH: 1963 case IPV6_V6ONLY: 1964 case IPV6_PORTRANGE: 1965 case IPV6_RECVTCLASS: 1966 case IPV6_AUTOFLOWLABEL: 1967 case IPV6_BINDANY: 1968 switch (optname) { 1969 1970 case IPV6_RECVHOPOPTS: 1971 optval = OPTBIT(IN6P_HOPOPTS); 1972 break; 1973 1974 case IPV6_RECVDSTOPTS: 1975 optval = OPTBIT(IN6P_DSTOPTS); 1976 break; 1977 1978 case IPV6_RECVRTHDRDSTOPTS: 1979 optval = OPTBIT(IN6P_RTHDRDSTOPTS); 1980 break; 1981 1982 case IPV6_UNICAST_HOPS: 1983 optval = in6p->in6p_hops; 1984 break; 1985 1986 case IPV6_RECVPKTINFO: 1987 optval = OPTBIT(IN6P_PKTINFO); 1988 break; 1989 1990 case IPV6_RECVHOPLIMIT: 1991 optval = OPTBIT(IN6P_HOPLIMIT); 1992 break; 1993 1994 case IPV6_RECVRTHDR: 1995 optval = OPTBIT(IN6P_RTHDR); 1996 break; 1997 1998 case IPV6_RECVPATHMTU: 1999 optval = OPTBIT(IN6P_MTU); 2000 break; 2001 2002 case IPV6_FAITH: 2003 optval = OPTBIT(INP_FAITH); 2004 break; 2005 2006 case IPV6_V6ONLY: 2007 optval = OPTBIT(IN6P_IPV6_V6ONLY); 2008 break; 2009 2010 case IPV6_PORTRANGE: 2011 { 2012 int flags; 2013 flags = in6p->inp_flags; 2014 if (flags & INP_HIGHPORT) 2015 optval = IPV6_PORTRANGE_HIGH; 2016 else if (flags & INP_LOWPORT) 2017 optval = IPV6_PORTRANGE_LOW; 2018 else 2019 optval = 0; 2020 break; 2021 } 2022 case IPV6_RECVTCLASS: 2023 optval = OPTBIT(IN6P_TCLASS); 2024 break; 2025 2026 case IPV6_AUTOFLOWLABEL: 2027 optval = OPTBIT(IN6P_AUTOFLOWLABEL); 2028 break; 2029 2030 case IPV6_BINDANY: 2031 optval = OPTBIT(INP_BINDANY); 2032 break; 2033 } 2034 if (error) 2035 break; 2036 error = sooptcopyout(sopt, &optval, 2037 sizeof optval); 2038 break; 2039 2040 case IPV6_PATHMTU: 2041 { 2042 u_long pmtu = 0; 2043 struct ip6_mtuinfo mtuinfo; 2044 struct route_in6 sro; 2045 2046 bzero(&sro, sizeof(sro)); 2047 2048 if (!(so->so_state & SS_ISCONNECTED)) 2049 return (ENOTCONN); 2050 /* 2051 * XXX: we dot not consider the case of source 2052 * routing, or optional information to specify 2053 * the outgoing interface. 2054 */ 2055 error = ip6_getpmtu(&sro, NULL, NULL, 2056 &in6p->in6p_faddr, &pmtu, NULL, 2057 so->so_fibnum); 2058 if (sro.ro_rt) 2059 RTFREE(sro.ro_rt); 2060 if (error) 2061 break; 2062 if (pmtu > IPV6_MAXPACKET) 2063 pmtu = IPV6_MAXPACKET; 2064 2065 bzero(&mtuinfo, sizeof(mtuinfo)); 2066 mtuinfo.ip6m_mtu = (u_int32_t)pmtu; 2067 optdata = (void *)&mtuinfo; 2068 optdatalen = sizeof(mtuinfo); 2069 error = sooptcopyout(sopt, optdata, 2070 optdatalen); 2071 break; 2072 } 2073 2074 case IPV6_2292PKTINFO: 2075 case IPV6_2292HOPLIMIT: 2076 case IPV6_2292HOPOPTS: 2077 case IPV6_2292RTHDR: 2078 case IPV6_2292DSTOPTS: 2079 switch (optname) { 2080 case IPV6_2292PKTINFO: 2081 optval = OPTBIT(IN6P_PKTINFO); 2082 break; 2083 case IPV6_2292HOPLIMIT: 2084 optval = OPTBIT(IN6P_HOPLIMIT); 2085 break; 2086 case IPV6_2292HOPOPTS: 2087 optval = OPTBIT(IN6P_HOPOPTS); 2088 break; 2089 case IPV6_2292RTHDR: 2090 optval = OPTBIT(IN6P_RTHDR); 2091 break; 2092 case IPV6_2292DSTOPTS: 2093 optval = OPTBIT(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); 2094 break; 2095 } 2096 error = sooptcopyout(sopt, &optval, 2097 sizeof optval); 2098 break; 2099 case IPV6_PKTINFO: 2100 case IPV6_HOPOPTS: 2101 case IPV6_RTHDR: 2102 case IPV6_DSTOPTS: 2103 case IPV6_RTHDRDSTOPTS: 2104 case IPV6_NEXTHOP: 2105 case IPV6_TCLASS: 2106 case IPV6_DONTFRAG: 2107 case IPV6_USE_MIN_MTU: 2108 case IPV6_PREFER_TEMPADDR: 2109 error = ip6_getpcbopt(in6p->in6p_outputopts, 2110 optname, sopt); 2111 break; 2112 2113 case IPV6_MULTICAST_IF: 2114 case IPV6_MULTICAST_HOPS: 2115 case IPV6_MULTICAST_LOOP: 2116 case IPV6_MSFILTER: 2117 error = ip6_getmoptions(in6p, sopt); 2118 break; 2119 2120#ifdef IPSEC 2121 case IPV6_IPSEC_POLICY: 2122 { 2123 caddr_t req = NULL; 2124 size_t len = 0; 2125 struct mbuf *m = NULL; 2126 struct mbuf **mp = &m; 2127 size_t ovalsize = sopt->sopt_valsize; 2128 caddr_t oval = (caddr_t)sopt->sopt_val; 2129 2130 error = soopt_getm(sopt, &m); /* XXX */ 2131 if (error != 0) 2132 break; 2133 error = soopt_mcopyin(sopt, m); /* XXX */ 2134 if (error != 0) 2135 break; 2136 sopt->sopt_valsize = ovalsize; 2137 sopt->sopt_val = oval; 2138 if (m) { 2139 req = mtod(m, caddr_t); 2140 len = m->m_len; 2141 } 2142 error = ipsec_get_policy(in6p, req, len, mp); 2143 if (error == 0) 2144 error = soopt_mcopyout(sopt, m); /* XXX */ 2145 if (error == 0 && m) 2146 m_freem(m); 2147 break; 2148 } 2149#endif /* IPSEC */ 2150 2151 default: 2152 error = ENOPROTOOPT; 2153 break; 2154 } 2155 break; 2156 } 2157 } 2158 return (error); 2159} 2160 2161int 2162ip6_raw_ctloutput(struct socket *so, struct sockopt *sopt) 2163{ 2164 int error = 0, optval, optlen; 2165 const int icmp6off = offsetof(struct icmp6_hdr, icmp6_cksum); 2166 struct inpcb *in6p = sotoinpcb(so); 2167 int level, op, optname; 2168 2169 level = sopt->sopt_level; 2170 op = sopt->sopt_dir; 2171 optname = sopt->sopt_name; 2172 optlen = sopt->sopt_valsize; 2173 2174 if (level != IPPROTO_IPV6) { 2175 return (EINVAL); 2176 } 2177 2178 switch (optname) { 2179 case IPV6_CHECKSUM: 2180 /* 2181 * For ICMPv6 sockets, no modification allowed for checksum 2182 * offset, permit "no change" values to help existing apps. 2183 * 2184 * RFC3542 says: "An attempt to set IPV6_CHECKSUM 2185 * for an ICMPv6 socket will fail." 2186 * The current behavior does not meet RFC3542. 2187 */ 2188 switch (op) { 2189 case SOPT_SET: 2190 if (optlen != sizeof(int)) { 2191 error = EINVAL; 2192 break; 2193 } 2194 error = sooptcopyin(sopt, &optval, sizeof(optval), 2195 sizeof(optval)); 2196 if (error) 2197 break; 2198 if ((optval % 2) != 0) { 2199 /* the API assumes even offset values */ 2200 error = EINVAL; 2201 } else if (so->so_proto->pr_protocol == 2202 IPPROTO_ICMPV6) { 2203 if (optval != icmp6off) 2204 error = EINVAL; 2205 } else 2206 in6p->in6p_cksum = optval; 2207 break; 2208 2209 case SOPT_GET: 2210 if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) 2211 optval = icmp6off; 2212 else 2213 optval = in6p->in6p_cksum; 2214 2215 error = sooptcopyout(sopt, &optval, sizeof(optval)); 2216 break; 2217 2218 default: 2219 error = EINVAL; 2220 break; 2221 } 2222 break; 2223 2224 default: 2225 error = ENOPROTOOPT; 2226 break; 2227 } 2228 2229 return (error); 2230} 2231 2232/* 2233 * Set up IP6 options in pcb for insertion in output packets or 2234 * specifying behavior of outgoing packets. 2235 */ 2236static int 2237ip6_pcbopts(struct ip6_pktopts **pktopt, struct mbuf *m, 2238 struct socket *so, struct sockopt *sopt) 2239{ 2240 struct ip6_pktopts *opt = *pktopt; 2241 int error = 0; 2242 struct thread *td = sopt->sopt_td; 2243 2244 /* turn off any old options. */ 2245 if (opt) { 2246#ifdef DIAGNOSTIC 2247 if (opt->ip6po_pktinfo || opt->ip6po_nexthop || 2248 opt->ip6po_hbh || opt->ip6po_dest1 || opt->ip6po_dest2 || 2249 opt->ip6po_rhinfo.ip6po_rhi_rthdr) 2250 printf("ip6_pcbopts: all specified options are cleared.\n"); 2251#endif 2252 ip6_clearpktopts(opt, -1); 2253 } else 2254 opt = malloc(sizeof(*opt), M_IP6OPT, M_WAITOK); 2255 *pktopt = NULL; 2256 2257 if (!m || m->m_len == 0) { 2258 /* 2259 * Only turning off any previous options, regardless of 2260 * whether the opt is just created or given. 2261 */ 2262 free(opt, M_IP6OPT); 2263 return (0); 2264 } 2265 2266 /* set options specified by user. */ 2267 if ((error = ip6_setpktopts(m, opt, NULL, (td != NULL) ? 2268 td->td_ucred : NULL, so->so_proto->pr_protocol)) != 0) { 2269 ip6_clearpktopts(opt, -1); /* XXX: discard all options */ 2270 free(opt, M_IP6OPT); 2271 return (error); 2272 } 2273 *pktopt = opt; 2274 return (0); 2275} 2276 2277/* 2278 * initialize ip6_pktopts. beware that there are non-zero default values in 2279 * the struct. 2280 */ 2281void 2282ip6_initpktopts(struct ip6_pktopts *opt) 2283{ 2284 2285 bzero(opt, sizeof(*opt)); 2286 opt->ip6po_hlim = -1; /* -1 means default hop limit */ 2287 opt->ip6po_tclass = -1; /* -1 means default traffic class */ 2288 opt->ip6po_minmtu = IP6PO_MINMTU_MCASTONLY; 2289 opt->ip6po_prefer_tempaddr = IP6PO_TEMPADDR_SYSTEM; 2290} 2291 2292static int 2293ip6_pcbopt(int optname, u_char *buf, int len, struct ip6_pktopts **pktopt, 2294 struct ucred *cred, int uproto) 2295{ 2296 struct ip6_pktopts *opt; 2297 2298 if (*pktopt == NULL) { 2299 *pktopt = malloc(sizeof(struct ip6_pktopts), M_IP6OPT, 2300 M_WAITOK); 2301 ip6_initpktopts(*pktopt); 2302 } 2303 opt = *pktopt; 2304 2305 return (ip6_setpktopt(optname, buf, len, opt, cred, 1, 0, uproto)); 2306} 2307 2308static int 2309ip6_getpcbopt(struct ip6_pktopts *pktopt, int optname, struct sockopt *sopt) 2310{ 2311 void *optdata = NULL; 2312 int optdatalen = 0; 2313 struct ip6_ext *ip6e; 2314 int error = 0; 2315 struct in6_pktinfo null_pktinfo; 2316 int deftclass = 0, on; 2317 int defminmtu = IP6PO_MINMTU_MCASTONLY; 2318 int defpreftemp = IP6PO_TEMPADDR_SYSTEM; 2319 2320 switch (optname) { 2321 case IPV6_PKTINFO: 2322 if (pktopt && pktopt->ip6po_pktinfo) 2323 optdata = (void *)pktopt->ip6po_pktinfo; 2324 else { 2325 /* XXX: we don't have to do this every time... */ 2326 bzero(&null_pktinfo, sizeof(null_pktinfo)); 2327 optdata = (void *)&null_pktinfo; 2328 } 2329 optdatalen = sizeof(struct in6_pktinfo); 2330 break; 2331 case IPV6_TCLASS: 2332 if (pktopt && pktopt->ip6po_tclass >= 0) 2333 optdata = (void *)&pktopt->ip6po_tclass; 2334 else 2335 optdata = (void *)&deftclass; 2336 optdatalen = sizeof(int); 2337 break; 2338 case IPV6_HOPOPTS: 2339 if (pktopt && pktopt->ip6po_hbh) { 2340 optdata = (void *)pktopt->ip6po_hbh; 2341 ip6e = (struct ip6_ext *)pktopt->ip6po_hbh; 2342 optdatalen = (ip6e->ip6e_len + 1) << 3; 2343 } 2344 break; 2345 case IPV6_RTHDR: 2346 if (pktopt && pktopt->ip6po_rthdr) { 2347 optdata = (void *)pktopt->ip6po_rthdr; 2348 ip6e = (struct ip6_ext *)pktopt->ip6po_rthdr; 2349 optdatalen = (ip6e->ip6e_len + 1) << 3; 2350 } 2351 break; 2352 case IPV6_RTHDRDSTOPTS: 2353 if (pktopt && pktopt->ip6po_dest1) { 2354 optdata = (void *)pktopt->ip6po_dest1; 2355 ip6e = (struct ip6_ext *)pktopt->ip6po_dest1; 2356 optdatalen = (ip6e->ip6e_len + 1) << 3; 2357 } 2358 break; 2359 case IPV6_DSTOPTS: 2360 if (pktopt && pktopt->ip6po_dest2) { 2361 optdata = (void *)pktopt->ip6po_dest2; 2362 ip6e = (struct ip6_ext *)pktopt->ip6po_dest2; 2363 optdatalen = (ip6e->ip6e_len + 1) << 3; 2364 } 2365 break; 2366 case IPV6_NEXTHOP: 2367 if (pktopt && pktopt->ip6po_nexthop) { 2368 optdata = (void *)pktopt->ip6po_nexthop; 2369 optdatalen = pktopt->ip6po_nexthop->sa_len; 2370 } 2371 break; 2372 case IPV6_USE_MIN_MTU: 2373 if (pktopt) 2374 optdata = (void *)&pktopt->ip6po_minmtu; 2375 else 2376 optdata = (void *)&defminmtu; 2377 optdatalen = sizeof(int); 2378 break; 2379 case IPV6_DONTFRAG: 2380 if (pktopt && ((pktopt->ip6po_flags) & IP6PO_DONTFRAG)) 2381 on = 1; 2382 else 2383 on = 0; 2384 optdata = (void *)&on; 2385 optdatalen = sizeof(on); 2386 break; 2387 case IPV6_PREFER_TEMPADDR: 2388 if (pktopt) 2389 optdata = (void *)&pktopt->ip6po_prefer_tempaddr; 2390 else 2391 optdata = (void *)&defpreftemp; 2392 optdatalen = sizeof(int); 2393 break; 2394 default: /* should not happen */ 2395#ifdef DIAGNOSTIC 2396 panic("ip6_getpcbopt: unexpected option\n"); 2397#endif 2398 return (ENOPROTOOPT); 2399 } 2400 2401 error = sooptcopyout(sopt, optdata, optdatalen); 2402 2403 return (error); 2404} 2405 2406void 2407ip6_clearpktopts(struct ip6_pktopts *pktopt, int optname) 2408{ 2409 if (pktopt == NULL) 2410 return; 2411 2412 if (optname == -1 || optname == IPV6_PKTINFO) { 2413 if (pktopt->ip6po_pktinfo) 2414 free(pktopt->ip6po_pktinfo, M_IP6OPT); 2415 pktopt->ip6po_pktinfo = NULL; 2416 } 2417 if (optname == -1 || optname == IPV6_HOPLIMIT) 2418 pktopt->ip6po_hlim = -1; 2419 if (optname == -1 || optname == IPV6_TCLASS) 2420 pktopt->ip6po_tclass = -1; 2421 if (optname == -1 || optname == IPV6_NEXTHOP) { 2422 if (pktopt->ip6po_nextroute.ro_rt) { 2423 RTFREE(pktopt->ip6po_nextroute.ro_rt); 2424 pktopt->ip6po_nextroute.ro_rt = NULL; 2425 } 2426 if (pktopt->ip6po_nexthop) 2427 free(pktopt->ip6po_nexthop, M_IP6OPT); 2428 pktopt->ip6po_nexthop = NULL; 2429 } 2430 if (optname == -1 || optname == IPV6_HOPOPTS) { 2431 if (pktopt->ip6po_hbh) 2432 free(pktopt->ip6po_hbh, M_IP6OPT); 2433 pktopt->ip6po_hbh = NULL; 2434 } 2435 if (optname == -1 || optname == IPV6_RTHDRDSTOPTS) { 2436 if (pktopt->ip6po_dest1) 2437 free(pktopt->ip6po_dest1, M_IP6OPT); 2438 pktopt->ip6po_dest1 = NULL; 2439 } 2440 if (optname == -1 || optname == IPV6_RTHDR) { 2441 if (pktopt->ip6po_rhinfo.ip6po_rhi_rthdr) 2442 free(pktopt->ip6po_rhinfo.ip6po_rhi_rthdr, M_IP6OPT); 2443 pktopt->ip6po_rhinfo.ip6po_rhi_rthdr = NULL; 2444 if (pktopt->ip6po_route.ro_rt) { 2445 RTFREE(pktopt->ip6po_route.ro_rt); 2446 pktopt->ip6po_route.ro_rt = NULL; 2447 } 2448 } 2449 if (optname == -1 || optname == IPV6_DSTOPTS) { 2450 if (pktopt->ip6po_dest2) 2451 free(pktopt->ip6po_dest2, M_IP6OPT); 2452 pktopt->ip6po_dest2 = NULL; 2453 } 2454} 2455 2456#define PKTOPT_EXTHDRCPY(type) \ 2457do {\ 2458 if (src->type) {\ 2459 int hlen = (((struct ip6_ext *)src->type)->ip6e_len + 1) << 3;\ 2460 dst->type = malloc(hlen, M_IP6OPT, canwait);\ 2461 if (dst->type == NULL && canwait == M_NOWAIT)\ 2462 goto bad;\ 2463 bcopy(src->type, dst->type, hlen);\ 2464 }\ 2465} while (/*CONSTCOND*/ 0) 2466 2467static int 2468copypktopts(struct ip6_pktopts *dst, struct ip6_pktopts *src, int canwait) 2469{ 2470 if (dst == NULL || src == NULL) { 2471 printf("ip6_clearpktopts: invalid argument\n"); 2472 return (EINVAL); 2473 } 2474 2475 dst->ip6po_hlim = src->ip6po_hlim; 2476 dst->ip6po_tclass = src->ip6po_tclass; 2477 dst->ip6po_flags = src->ip6po_flags; 2478 dst->ip6po_minmtu = src->ip6po_minmtu; 2479 dst->ip6po_prefer_tempaddr = src->ip6po_prefer_tempaddr; 2480 if (src->ip6po_pktinfo) { 2481 dst->ip6po_pktinfo = malloc(sizeof(*dst->ip6po_pktinfo), 2482 M_IP6OPT, canwait); 2483 if (dst->ip6po_pktinfo == NULL) 2484 goto bad; 2485 *dst->ip6po_pktinfo = *src->ip6po_pktinfo; 2486 } 2487 if (src->ip6po_nexthop) { 2488 dst->ip6po_nexthop = malloc(src->ip6po_nexthop->sa_len, 2489 M_IP6OPT, canwait); 2490 if (dst->ip6po_nexthop == NULL) 2491 goto bad; 2492 bcopy(src->ip6po_nexthop, dst->ip6po_nexthop, 2493 src->ip6po_nexthop->sa_len); 2494 } 2495 PKTOPT_EXTHDRCPY(ip6po_hbh); 2496 PKTOPT_EXTHDRCPY(ip6po_dest1); 2497 PKTOPT_EXTHDRCPY(ip6po_dest2); 2498 PKTOPT_EXTHDRCPY(ip6po_rthdr); /* not copy the cached route */ 2499 return (0); 2500 2501 bad: 2502 ip6_clearpktopts(dst, -1); 2503 return (ENOBUFS); 2504} 2505#undef PKTOPT_EXTHDRCPY 2506 2507struct ip6_pktopts * 2508ip6_copypktopts(struct ip6_pktopts *src, int canwait) 2509{ 2510 int error; 2511 struct ip6_pktopts *dst; 2512 2513 dst = malloc(sizeof(*dst), M_IP6OPT, canwait); 2514 if (dst == NULL) 2515 return (NULL); 2516 ip6_initpktopts(dst); 2517 2518 if ((error = copypktopts(dst, src, canwait)) != 0) { 2519 free(dst, M_IP6OPT); 2520 return (NULL); 2521 } 2522 2523 return (dst); 2524} 2525 2526void 2527ip6_freepcbopts(struct ip6_pktopts *pktopt) 2528{ 2529 if (pktopt == NULL) 2530 return; 2531 2532 ip6_clearpktopts(pktopt, -1); 2533 2534 free(pktopt, M_IP6OPT); 2535} 2536 2537/* 2538 * Set IPv6 outgoing packet options based on advanced API. 2539 */ 2540int 2541ip6_setpktopts(struct mbuf *control, struct ip6_pktopts *opt, 2542 struct ip6_pktopts *stickyopt, struct ucred *cred, int uproto) 2543{ 2544 struct cmsghdr *cm = 0; 2545 2546 if (control == NULL || opt == NULL) 2547 return (EINVAL); 2548 2549 ip6_initpktopts(opt); 2550 if (stickyopt) { 2551 int error; 2552 2553 /* 2554 * If stickyopt is provided, make a local copy of the options 2555 * for this particular packet, then override them by ancillary 2556 * objects. 2557 * XXX: copypktopts() does not copy the cached route to a next 2558 * hop (if any). This is not very good in terms of efficiency, 2559 * but we can allow this since this option should be rarely 2560 * used. 2561 */ 2562 if ((error = copypktopts(opt, stickyopt, M_NOWAIT)) != 0) 2563 return (error); 2564 } 2565 2566 /* 2567 * XXX: Currently, we assume all the optional information is stored 2568 * in a single mbuf. 2569 */ 2570 if (control->m_next) 2571 return (EINVAL); 2572 2573 for (; control->m_len > 0; control->m_data += CMSG_ALIGN(cm->cmsg_len), 2574 control->m_len -= CMSG_ALIGN(cm->cmsg_len)) { 2575 int error; 2576 2577 if (control->m_len < CMSG_LEN(0)) 2578 return (EINVAL); 2579 2580 cm = mtod(control, struct cmsghdr *); 2581 if (cm->cmsg_len == 0 || cm->cmsg_len > control->m_len) 2582 return (EINVAL); 2583 if (cm->cmsg_level != IPPROTO_IPV6) 2584 continue; 2585 2586 error = ip6_setpktopt(cm->cmsg_type, CMSG_DATA(cm), 2587 cm->cmsg_len - CMSG_LEN(0), opt, cred, 0, 1, uproto); 2588 if (error) 2589 return (error); 2590 } 2591 2592 return (0); 2593} 2594 2595/* 2596 * Set a particular packet option, as a sticky option or an ancillary data 2597 * item. "len" can be 0 only when it's a sticky option. 2598 * We have 4 cases of combination of "sticky" and "cmsg": 2599 * "sticky=0, cmsg=0": impossible 2600 * "sticky=0, cmsg=1": RFC2292 or RFC3542 ancillary data 2601 * "sticky=1, cmsg=0": RFC3542 socket option 2602 * "sticky=1, cmsg=1": RFC2292 socket option 2603 */ 2604static int 2605ip6_setpktopt(int optname, u_char *buf, int len, struct ip6_pktopts *opt, 2606 struct ucred *cred, int sticky, int cmsg, int uproto) 2607{ 2608 int minmtupolicy, preftemp; 2609 int error; 2610 2611 if (!sticky && !cmsg) { 2612#ifdef DIAGNOSTIC 2613 printf("ip6_setpktopt: impossible case\n"); 2614#endif 2615 return (EINVAL); 2616 } 2617 2618 /* 2619 * IPV6_2292xxx is for backward compatibility to RFC2292, and should 2620 * not be specified in the context of RFC3542. Conversely, 2621 * RFC3542 types should not be specified in the context of RFC2292. 2622 */ 2623 if (!cmsg) { 2624 switch (optname) { 2625 case IPV6_2292PKTINFO: 2626 case IPV6_2292HOPLIMIT: 2627 case IPV6_2292NEXTHOP: 2628 case IPV6_2292HOPOPTS: 2629 case IPV6_2292DSTOPTS: 2630 case IPV6_2292RTHDR: 2631 case IPV6_2292PKTOPTIONS: 2632 return (ENOPROTOOPT); 2633 } 2634 } 2635 if (sticky && cmsg) { 2636 switch (optname) { 2637 case IPV6_PKTINFO: 2638 case IPV6_HOPLIMIT: 2639 case IPV6_NEXTHOP: 2640 case IPV6_HOPOPTS: 2641 case IPV6_DSTOPTS: 2642 case IPV6_RTHDRDSTOPTS: 2643 case IPV6_RTHDR: 2644 case IPV6_USE_MIN_MTU: 2645 case IPV6_DONTFRAG: 2646 case IPV6_TCLASS: 2647 case IPV6_PREFER_TEMPADDR: /* XXX: not an RFC3542 option */ 2648 return (ENOPROTOOPT); 2649 } 2650 } 2651 2652 switch (optname) { 2653 case IPV6_2292PKTINFO: 2654 case IPV6_PKTINFO: 2655 { 2656 struct ifnet *ifp = NULL; 2657 struct in6_pktinfo *pktinfo; 2658 2659 if (len != sizeof(struct in6_pktinfo)) 2660 return (EINVAL); 2661 2662 pktinfo = (struct in6_pktinfo *)buf; 2663 2664 /* 2665 * An application can clear any sticky IPV6_PKTINFO option by 2666 * doing a "regular" setsockopt with ipi6_addr being 2667 * in6addr_any and ipi6_ifindex being zero. 2668 * [RFC 3542, Section 6] 2669 */ 2670 if (optname == IPV6_PKTINFO && opt->ip6po_pktinfo && 2671 pktinfo->ipi6_ifindex == 0 && 2672 IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) { 2673 ip6_clearpktopts(opt, optname); 2674 break; 2675 } 2676 2677 if (uproto == IPPROTO_TCP && optname == IPV6_PKTINFO && 2678 sticky && !IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) { 2679 return (EINVAL); 2680 } 2681 2682 /* validate the interface index if specified. */ 2683 if (pktinfo->ipi6_ifindex > V_if_index || 2684 pktinfo->ipi6_ifindex < 0) { 2685 return (ENXIO); 2686 } 2687 if (pktinfo->ipi6_ifindex) { 2688 ifp = ifnet_byindex(pktinfo->ipi6_ifindex); 2689 if (ifp == NULL) 2690 return (ENXIO); 2691 } 2692 2693 /* 2694 * We store the address anyway, and let in6_selectsrc() 2695 * validate the specified address. This is because ipi6_addr 2696 * may not have enough information about its scope zone, and 2697 * we may need additional information (such as outgoing 2698 * interface or the scope zone of a destination address) to 2699 * disambiguate the scope. 2700 * XXX: the delay of the validation may confuse the 2701 * application when it is used as a sticky option. 2702 */ 2703 if (opt->ip6po_pktinfo == NULL) { 2704 opt->ip6po_pktinfo = malloc(sizeof(*pktinfo), 2705 M_IP6OPT, M_NOWAIT); 2706 if (opt->ip6po_pktinfo == NULL) 2707 return (ENOBUFS); 2708 } 2709 bcopy(pktinfo, opt->ip6po_pktinfo, sizeof(*pktinfo)); 2710 break; 2711 } 2712 2713 case IPV6_2292HOPLIMIT: 2714 case IPV6_HOPLIMIT: 2715 { 2716 int *hlimp; 2717 2718 /* 2719 * RFC 3542 deprecated the usage of sticky IPV6_HOPLIMIT 2720 * to simplify the ordering among hoplimit options. 2721 */ 2722 if (optname == IPV6_HOPLIMIT && sticky) 2723 return (ENOPROTOOPT); 2724 2725 if (len != sizeof(int)) 2726 return (EINVAL); 2727 hlimp = (int *)buf; 2728 if (*hlimp < -1 || *hlimp > 255) 2729 return (EINVAL); 2730 2731 opt->ip6po_hlim = *hlimp; 2732 break; 2733 } 2734 2735 case IPV6_TCLASS: 2736 { 2737 int tclass; 2738 2739 if (len != sizeof(int)) 2740 return (EINVAL); 2741 tclass = *(int *)buf; 2742 if (tclass < -1 || tclass > 255) 2743 return (EINVAL); 2744 2745 opt->ip6po_tclass = tclass; 2746 break; 2747 } 2748 2749 case IPV6_2292NEXTHOP: 2750 case IPV6_NEXTHOP: 2751 if (cred != NULL) { 2752 error = priv_check_cred(cred, 2753 PRIV_NETINET_SETHDROPTS, 0); 2754 if (error) 2755 return (error); 2756 } 2757 2758 if (len == 0) { /* just remove the option */ 2759 ip6_clearpktopts(opt, IPV6_NEXTHOP); 2760 break; 2761 } 2762 2763 /* check if cmsg_len is large enough for sa_len */ 2764 if (len < sizeof(struct sockaddr) || len < *buf) 2765 return (EINVAL); 2766 2767 switch (((struct sockaddr *)buf)->sa_family) { 2768 case AF_INET6: 2769 { 2770 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)buf; 2771 int error; 2772 2773 if (sa6->sin6_len != sizeof(struct sockaddr_in6)) 2774 return (EINVAL); 2775 2776 if (IN6_IS_ADDR_UNSPECIFIED(&sa6->sin6_addr) || 2777 IN6_IS_ADDR_MULTICAST(&sa6->sin6_addr)) { 2778 return (EINVAL); 2779 } 2780 if ((error = sa6_embedscope(sa6, V_ip6_use_defzone)) 2781 != 0) { 2782 return (error); 2783 } 2784 break; 2785 } 2786 case AF_LINK: /* should eventually be supported */ 2787 default: 2788 return (EAFNOSUPPORT); 2789 } 2790 2791 /* turn off the previous option, then set the new option. */ 2792 ip6_clearpktopts(opt, IPV6_NEXTHOP); 2793 opt->ip6po_nexthop = malloc(*buf, M_IP6OPT, M_NOWAIT); 2794 if (opt->ip6po_nexthop == NULL) 2795 return (ENOBUFS); 2796 bcopy(buf, opt->ip6po_nexthop, *buf); 2797 break; 2798 2799 case IPV6_2292HOPOPTS: 2800 case IPV6_HOPOPTS: 2801 { 2802 struct ip6_hbh *hbh; 2803 int hbhlen; 2804 2805 /* 2806 * XXX: We don't allow a non-privileged user to set ANY HbH 2807 * options, since per-option restriction has too much 2808 * overhead. 2809 */ 2810 if (cred != NULL) { 2811 error = priv_check_cred(cred, 2812 PRIV_NETINET_SETHDROPTS, 0); 2813 if (error) 2814 return (error); 2815 } 2816 2817 if (len == 0) { 2818 ip6_clearpktopts(opt, IPV6_HOPOPTS); 2819 break; /* just remove the option */ 2820 } 2821 2822 /* message length validation */ 2823 if (len < sizeof(struct ip6_hbh)) 2824 return (EINVAL); 2825 hbh = (struct ip6_hbh *)buf; 2826 hbhlen = (hbh->ip6h_len + 1) << 3; 2827 if (len != hbhlen) 2828 return (EINVAL); 2829 2830 /* turn off the previous option, then set the new option. */ 2831 ip6_clearpktopts(opt, IPV6_HOPOPTS); 2832 opt->ip6po_hbh = malloc(hbhlen, M_IP6OPT, M_NOWAIT); 2833 if (opt->ip6po_hbh == NULL) 2834 return (ENOBUFS); 2835 bcopy(hbh, opt->ip6po_hbh, hbhlen); 2836 2837 break; 2838 } 2839 2840 case IPV6_2292DSTOPTS: 2841 case IPV6_DSTOPTS: 2842 case IPV6_RTHDRDSTOPTS: 2843 { 2844 struct ip6_dest *dest, **newdest = NULL; 2845 int destlen; 2846 2847 if (cred != NULL) { /* XXX: see the comment for IPV6_HOPOPTS */ 2848 error = priv_check_cred(cred, 2849 PRIV_NETINET_SETHDROPTS, 0); 2850 if (error) 2851 return (error); 2852 } 2853 2854 if (len == 0) { 2855 ip6_clearpktopts(opt, optname); 2856 break; /* just remove the option */ 2857 } 2858 2859 /* message length validation */ 2860 if (len < sizeof(struct ip6_dest)) 2861 return (EINVAL); 2862 dest = (struct ip6_dest *)buf; 2863 destlen = (dest->ip6d_len + 1) << 3; 2864 if (len != destlen) 2865 return (EINVAL); 2866 2867 /* 2868 * Determine the position that the destination options header 2869 * should be inserted; before or after the routing header. 2870 */ 2871 switch (optname) { 2872 case IPV6_2292DSTOPTS: 2873 /* 2874 * The old advacned API is ambiguous on this point. 2875 * Our approach is to determine the position based 2876 * according to the existence of a routing header. 2877 * Note, however, that this depends on the order of the 2878 * extension headers in the ancillary data; the 1st 2879 * part of the destination options header must appear 2880 * before the routing header in the ancillary data, 2881 * too. 2882 * RFC3542 solved the ambiguity by introducing 2883 * separate ancillary data or option types. 2884 */ 2885 if (opt->ip6po_rthdr == NULL) 2886 newdest = &opt->ip6po_dest1; 2887 else 2888 newdest = &opt->ip6po_dest2; 2889 break; 2890 case IPV6_RTHDRDSTOPTS: 2891 newdest = &opt->ip6po_dest1; 2892 break; 2893 case IPV6_DSTOPTS: 2894 newdest = &opt->ip6po_dest2; 2895 break; 2896 } 2897 2898 /* turn off the previous option, then set the new option. */ 2899 ip6_clearpktopts(opt, optname); 2900 *newdest = malloc(destlen, M_IP6OPT, M_NOWAIT); 2901 if (*newdest == NULL) 2902 return (ENOBUFS); 2903 bcopy(dest, *newdest, destlen); 2904 2905 break; 2906 } 2907 2908 case IPV6_2292RTHDR: 2909 case IPV6_RTHDR: 2910 { 2911 struct ip6_rthdr *rth; 2912 int rthlen; 2913 2914 if (len == 0) { 2915 ip6_clearpktopts(opt, IPV6_RTHDR); 2916 break; /* just remove the option */ 2917 } 2918 2919 /* message length validation */ 2920 if (len < sizeof(struct ip6_rthdr)) 2921 return (EINVAL); 2922 rth = (struct ip6_rthdr *)buf; 2923 rthlen = (rth->ip6r_len + 1) << 3; 2924 if (len != rthlen) 2925 return (EINVAL); 2926 2927 switch (rth->ip6r_type) { 2928 case IPV6_RTHDR_TYPE_0: 2929 if (rth->ip6r_len == 0) /* must contain one addr */ 2930 return (EINVAL); 2931 if (rth->ip6r_len % 2) /* length must be even */ 2932 return (EINVAL); 2933 if (rth->ip6r_len / 2 != rth->ip6r_segleft) 2934 return (EINVAL); 2935 break; 2936 default: 2937 return (EINVAL); /* not supported */ 2938 } 2939 2940 /* turn off the previous option */ 2941 ip6_clearpktopts(opt, IPV6_RTHDR); 2942 opt->ip6po_rthdr = malloc(rthlen, M_IP6OPT, M_NOWAIT); 2943 if (opt->ip6po_rthdr == NULL) 2944 return (ENOBUFS); 2945 bcopy(rth, opt->ip6po_rthdr, rthlen); 2946 2947 break; 2948 } 2949 2950 case IPV6_USE_MIN_MTU: 2951 if (len != sizeof(int)) 2952 return (EINVAL); 2953 minmtupolicy = *(int *)buf; 2954 if (minmtupolicy != IP6PO_MINMTU_MCASTONLY && 2955 minmtupolicy != IP6PO_MINMTU_DISABLE && 2956 minmtupolicy != IP6PO_MINMTU_ALL) { 2957 return (EINVAL); 2958 } 2959 opt->ip6po_minmtu = minmtupolicy; 2960 break; 2961 2962 case IPV6_DONTFRAG: 2963 if (len != sizeof(int)) 2964 return (EINVAL); 2965 2966 if (uproto == IPPROTO_TCP || *(int *)buf == 0) { 2967 /* 2968 * we ignore this option for TCP sockets. 2969 * (RFC3542 leaves this case unspecified.) 2970 */ 2971 opt->ip6po_flags &= ~IP6PO_DONTFRAG; 2972 } else 2973 opt->ip6po_flags |= IP6PO_DONTFRAG; 2974 break; 2975 2976 case IPV6_PREFER_TEMPADDR: 2977 if (len != sizeof(int)) 2978 return (EINVAL); 2979 preftemp = *(int *)buf; 2980 if (preftemp != IP6PO_TEMPADDR_SYSTEM && 2981 preftemp != IP6PO_TEMPADDR_NOTPREFER && 2982 preftemp != IP6PO_TEMPADDR_PREFER) { 2983 return (EINVAL); 2984 } 2985 opt->ip6po_prefer_tempaddr = preftemp; 2986 break; 2987 2988 default: 2989 return (ENOPROTOOPT); 2990 } /* end of switch */ 2991 2992 return (0); 2993} 2994 2995/* 2996 * Routine called from ip6_output() to loop back a copy of an IP6 multicast 2997 * packet to the input queue of a specified interface. Note that this 2998 * calls the output routine of the loopback "driver", but with an interface 2999 * pointer that might NOT be &loif -- easier than replicating that code here. 3000 */ 3001void 3002ip6_mloopback(struct ifnet *ifp, struct mbuf *m, struct sockaddr_in6 *dst) 3003{ 3004 struct mbuf *copym; 3005 struct ip6_hdr *ip6; 3006 3007 copym = m_copy(m, 0, M_COPYALL); 3008 if (copym == NULL) 3009 return; 3010 3011 /* 3012 * Make sure to deep-copy IPv6 header portion in case the data 3013 * is in an mbuf cluster, so that we can safely override the IPv6 3014 * header portion later. 3015 */ 3016 if ((copym->m_flags & M_EXT) != 0 || 3017 copym->m_len < sizeof(struct ip6_hdr)) { 3018 copym = m_pullup(copym, sizeof(struct ip6_hdr)); 3019 if (copym == NULL) 3020 return; 3021 } 3022 3023#ifdef DIAGNOSTIC 3024 if (copym->m_len < sizeof(*ip6)) { 3025 m_freem(copym); 3026 return; 3027 } 3028#endif 3029 3030 ip6 = mtod(copym, struct ip6_hdr *); 3031 /* 3032 * clear embedded scope identifiers if necessary. 3033 * in6_clearscope will touch the addresses only when necessary. 3034 */ 3035 in6_clearscope(&ip6->ip6_src); 3036 in6_clearscope(&ip6->ip6_dst); 3037 3038 (void)if_simloop(ifp, copym, dst->sin6_family, 0); 3039} 3040 3041/* 3042 * Chop IPv6 header off from the payload. 3043 */ 3044static int 3045ip6_splithdr(struct mbuf *m, struct ip6_exthdrs *exthdrs) 3046{ 3047 struct mbuf *mh; 3048 struct ip6_hdr *ip6; 3049 3050 ip6 = mtod(m, struct ip6_hdr *); 3051 if (m->m_len > sizeof(*ip6)) { 3052 MGETHDR(mh, M_DONTWAIT, MT_HEADER); 3053 if (mh == 0) { 3054 m_freem(m); 3055 return ENOBUFS; 3056 } 3057 M_MOVE_PKTHDR(mh, m); 3058 MH_ALIGN(mh, sizeof(*ip6)); 3059 m->m_len -= sizeof(*ip6); 3060 m->m_data += sizeof(*ip6); 3061 mh->m_next = m; 3062 m = mh; 3063 m->m_len = sizeof(*ip6); 3064 bcopy((caddr_t)ip6, mtod(m, caddr_t), sizeof(*ip6)); 3065 } 3066 exthdrs->ip6e_ip6 = m; 3067 return 0; 3068} 3069 3070/* 3071 * Compute IPv6 extension header length. 3072 */ 3073int 3074ip6_optlen(struct inpcb *in6p) 3075{ 3076 int len; 3077 3078 if (!in6p->in6p_outputopts) 3079 return 0; 3080 3081 len = 0; 3082#define elen(x) \ 3083 (((struct ip6_ext *)(x)) ? (((struct ip6_ext *)(x))->ip6e_len + 1) << 3 : 0) 3084 3085 len += elen(in6p->in6p_outputopts->ip6po_hbh); 3086 if (in6p->in6p_outputopts->ip6po_rthdr) 3087 /* dest1 is valid with rthdr only */ 3088 len += elen(in6p->in6p_outputopts->ip6po_dest1); 3089 len += elen(in6p->in6p_outputopts->ip6po_rthdr); 3090 len += elen(in6p->in6p_outputopts->ip6po_dest2); 3091 return len; 3092#undef elen 3093} 3094