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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/9.1/sys/netinet6/ip6_output.c 240194 2012-09-07 09:45:08Z bz $"); 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 122 123 extern int in6_mcast_loop; 124 125 struct 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 }; 132 133 static int ip6_pcbopt __P((int, u_char *, int, struct ip6_pktopts **, 134 struct ucred *, int)); 135 static int ip6_pcbopts __P((struct ip6_pktopts **, struct mbuf *, 136 struct socket *, struct sockopt *)); 137 static int ip6_getpcbopt(struct ip6_pktopts *, int, struct sockopt *); 138 static int ip6_setpktopt __P((int, u_char *, int, struct ip6_pktopts *, 139 struct ucred *, int, int, int)); 140 141 static int ip6_copyexthdr(struct mbuf **, caddr_t, int); 142 static int ip6_insertfraghdr __P((struct mbuf *, struct mbuf *, int, 143 struct ip6_frag **)); 144 static int ip6_insert_jumboopt(struct ip6_exthdrs *, u_int32_t); 145 static int ip6_splithdr(struct mbuf *, struct ip6_exthdrs *); 146 static int ip6_getpmtu __P((struct route_in6 *, struct route_in6 *, 147 struct ifnet *, struct in6_addr *, u_long *, int *, u_int)); 148 static 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) 186 187 static void 188 in6_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 * 218 * type of "mtu": rt_rmx.rmx_mtu is u_long, ifnet.ifr_mtu is int, and 219 * nd_ifinfo.linkmtu is u_int32_t. so we use u_long to hold largest one, 220 * which is rt_rmx.rmx_mtu. 221 * 222 * ifpp - XXX: just for statistics 223 */ 224 int 225 ip6_output(struct mbuf *m0, struct ip6_pktopts *opt, 226 struct route_in6 *ro, int flags, struct ip6_moptions *im6o, 227 struct ifnet **ifpp, struct inpcb *inp) 228 { 229 struct ip6_hdr *ip6, *mhip6; 230 struct ifnet *ifp, *origifp; 231 struct mbuf *m = m0; 232 struct mbuf *mprev = NULL; 233 int hlen, tlen, len, off; 234 struct route_in6 ip6route; 235 struct rtentry *rt = NULL; 236 struct sockaddr_in6 *dst, src_sa, dst_sa; 237 struct in6_addr odst; 238 int error = 0; 239 struct in6_ifaddr *ia = NULL; 240 u_long mtu; 241 int alwaysfrag, dontfrag; 242 u_int32_t optlen = 0, plen = 0, unfragpartlen = 0; 243 struct ip6_exthdrs exthdrs; 244 struct in6_addr finaldst, src0, dst0; 245 u_int32_t zone; 246 struct route_in6 *ro_pmtu = NULL; 247 int flevalid = 0; 248 int hdrsplit = 0; 249 int needipsec = 0; 250 int sw_csum, tso; 251 #ifdef IPSEC 252 struct ipsec_output_state state; 253 struct ip6_rthdr *rh = NULL; 254 int needipsectun = 0; 255 int segleft_org = 0; 256 struct secpolicy *sp = NULL; 257 #endif /* IPSEC */ 258 #ifdef IPFIREWALL_FORWARD 259 struct m_tag *fwd_tag; 260 #endif 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 } 486 skip_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 == &ip6route) { 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 if ((fle = flowtable_lookup_mbuf(V_ip6_ft, m, AF_INET6)) != NULL) { 534 flow_to_route_in6(fle, ro); 535 if (ro->ro_rt != NULL && ro->ro_lle != NULL) 536 flevalid = 1; 537 } 538 } 539 #endif 540 again: 541 /* 542 * if specified, try to fill in the traffic class field. 543 * do not override if a non-zero value is already set. 544 * we check the diffserv field and the ecn field separately. 545 */ 546 if (opt && opt->ip6po_tclass >= 0) { 547 int mask = 0; 548 549 if ((ip6->ip6_flow & htonl(0xfc << 20)) == 0) 550 mask |= 0xfc; 551 if ((ip6->ip6_flow & htonl(0x03 << 20)) == 0) 552 mask |= 0x03; 553 if (mask != 0) 554 ip6->ip6_flow |= htonl((opt->ip6po_tclass & mask) << 20); 555 } 556 557 /* fill in or override the hop limit field, if necessary. */ 558 if (opt && opt->ip6po_hlim != -1) 559 ip6->ip6_hlim = opt->ip6po_hlim & 0xff; 560 else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 561 if (im6o != NULL) 562 ip6->ip6_hlim = im6o->im6o_multicast_hlim; 563 else 564 ip6->ip6_hlim = V_ip6_defmcasthlim; 565 } 566 567 #ifdef IPSEC 568 /* 569 * We may re-inject packets into the stack here. 570 */ 571 if (needipsec && needipsectun) { 572 struct ipsec_output_state state; 573 574 /* 575 * All the extension headers will become inaccessible 576 * (since they can be encrypted). 577 * Don't panic, we need no more updates to extension headers 578 * on inner IPv6 packet (since they are now encapsulated). 579 * 580 * IPv6 [ESP|AH] IPv6 [extension headers] payload 581 */ 582 bzero(&exthdrs, sizeof(exthdrs)); 583 exthdrs.ip6e_ip6 = m; 584 585 bzero(&state, sizeof(state)); 586 state.m = m; 587 state.ro = (struct route *)ro; 588 state.dst = (struct sockaddr *)dst; 589 590 error = ipsec6_output_tunnel(&state, sp, flags); 591 592 m = state.m; 593 ro = (struct route_in6 *)state.ro; 594 dst = (struct sockaddr_in6 *)state.dst; 595 if (error == EJUSTRETURN) { 596 /* 597 * We had a SP with a level of 'use' and no SA. We 598 * will just continue to process the packet without 599 * IPsec processing. 600 */ 601 ; 602 } else if (error) { 603 /* mbuf is already reclaimed in ipsec6_output_tunnel. */ 604 m0 = m = NULL; 605 m = NULL; 606 switch (error) { 607 case EHOSTUNREACH: 608 case ENETUNREACH: 609 case EMSGSIZE: 610 case ENOBUFS: 611 case ENOMEM: 612 break; 613 default: 614 printf("[%s:%d] (ipsec): error code %d\n", 615 __func__, __LINE__, error); 616 /* FALLTHROUGH */ 617 case ENOENT: 618 /* don't show these error codes to the user */ 619 error = 0; 620 break; 621 } 622 goto bad; 623 } else { 624 /* 625 * In the FAST IPSec case we have already 626 * re-injected the packet and it has been freed 627 * by the ipsec_done() function. So, just clean 628 * up after ourselves. 629 */ 630 m = NULL; 631 goto done; 632 } 633 634 exthdrs.ip6e_ip6 = m; 635 } 636 #endif /* IPSEC */ 637 638 /* adjust pointer */ 639 ip6 = mtod(m, struct ip6_hdr *); 640 641 bzero(&dst_sa, sizeof(dst_sa)); 642 dst_sa.sin6_family = AF_INET6; 643 dst_sa.sin6_len = sizeof(dst_sa); 644 dst_sa.sin6_addr = ip6->ip6_dst; 645 if (flevalid) { 646 rt = ro->ro_rt; 647 ifp = ro->ro_rt->rt_ifp; 648 } else if ((error = in6_selectroute_fib(&dst_sa, opt, im6o, ro, 649 &ifp, &rt, inp ? inp->inp_inc.inc_fibnum : M_GETFIB(m))) != 0) { 650 switch (error) { 651 case EHOSTUNREACH: 652 V_ip6stat.ip6s_noroute++; 653 break; 654 case EADDRNOTAVAIL: 655 default: 656 break; /* XXX statistics? */ 657 } 658 if (ifp != NULL) 659 in6_ifstat_inc(ifp, ifs6_out_discard); 660 goto bad; 661 } 662 if (rt == NULL) { 663 /* 664 * If in6_selectroute() does not return a route entry, 665 * dst may not have been updated. 666 */ 667 *dst = dst_sa; /* XXX */ 668 } 669 670 /* 671 * then rt (for unicast) and ifp must be non-NULL valid values. 672 */ 673 if ((flags & IPV6_FORWARDING) == 0) { 674 /* XXX: the FORWARDING flag can be set for mrouting. */ 675 in6_ifstat_inc(ifp, ifs6_out_request); 676 } 677 if (rt != NULL) { 678 ia = (struct in6_ifaddr *)(rt->rt_ifa); 679 rt->rt_use++; 680 } 681 682 683 /* 684 * The outgoing interface must be in the zone of source and 685 * destination addresses. 686 */ 687 origifp = ifp; 688 689 src0 = ip6->ip6_src; 690 if (in6_setscope(&src0, origifp, &zone)) 691 goto badscope; 692 bzero(&src_sa, sizeof(src_sa)); 693 src_sa.sin6_family = AF_INET6; 694 src_sa.sin6_len = sizeof(src_sa); 695 src_sa.sin6_addr = ip6->ip6_src; 696 if (sa6_recoverscope(&src_sa) || zone != src_sa.sin6_scope_id) 697 goto badscope; 698 699 dst0 = ip6->ip6_dst; 700 if (in6_setscope(&dst0, origifp, &zone)) 701 goto badscope; 702 /* re-initialize to be sure */ 703 bzero(&dst_sa, sizeof(dst_sa)); 704 dst_sa.sin6_family = AF_INET6; 705 dst_sa.sin6_len = sizeof(dst_sa); 706 dst_sa.sin6_addr = ip6->ip6_dst; 707 if (sa6_recoverscope(&dst_sa) || zone != dst_sa.sin6_scope_id) { 708 goto badscope; 709 } 710 711 /* We should use ia_ifp to support the case of 712 * sending packets to an address of our own. 713 */ 714 if (ia != NULL && ia->ia_ifp) 715 ifp = ia->ia_ifp; 716 717 /* scope check is done. */ 718 goto routefound; 719 720 badscope: 721 V_ip6stat.ip6s_badscope++; 722 in6_ifstat_inc(origifp, ifs6_out_discard); 723 if (error == 0) 724 error = EHOSTUNREACH; /* XXX */ 725 goto bad; 726 727 routefound: 728 if (rt && !IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 729 if (opt && opt->ip6po_nextroute.ro_rt) { 730 /* 731 * The nexthop is explicitly specified by the 732 * application. We assume the next hop is an IPv6 733 * address. 734 */ 735 dst = (struct sockaddr_in6 *)opt->ip6po_nexthop; 736 } 737 else if ((rt->rt_flags & RTF_GATEWAY)) 738 dst = (struct sockaddr_in6 *)rt->rt_gateway; 739 } 740 741 if (!IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 742 m->m_flags &= ~(M_BCAST | M_MCAST); /* just in case */ 743 } else { 744 m->m_flags = (m->m_flags & ~M_BCAST) | M_MCAST; 745 in6_ifstat_inc(ifp, ifs6_out_mcast); 746 /* 747 * Confirm that the outgoing interface supports multicast. 748 */ 749 if (!(ifp->if_flags & IFF_MULTICAST)) { 750 V_ip6stat.ip6s_noroute++; 751 in6_ifstat_inc(ifp, ifs6_out_discard); 752 error = ENETUNREACH; 753 goto bad; 754 } 755 if ((im6o == NULL && in6_mcast_loop) || 756 (im6o && im6o->im6o_multicast_loop)) { 757 /* 758 * Loop back multicast datagram if not expressly 759 * forbidden to do so, even if we have not joined 760 * the address; protocols will filter it later, 761 * thus deferring a hash lookup and lock acquisition 762 * at the expense of an m_copym(). 763 */ 764 ip6_mloopback(ifp, m, dst); 765 } else { 766 /* 767 * If we are acting as a multicast router, perform 768 * multicast forwarding as if the packet had just 769 * arrived on the interface to which we are about 770 * to send. The multicast forwarding function 771 * recursively calls this function, using the 772 * IPV6_FORWARDING flag to prevent infinite recursion. 773 * 774 * Multicasts that are looped back by ip6_mloopback(), 775 * above, will be forwarded by the ip6_input() routine, 776 * if necessary. 777 */ 778 if (V_ip6_mrouter && (flags & IPV6_FORWARDING) == 0) { 779 /* 780 * XXX: ip6_mforward expects that rcvif is NULL 781 * when it is called from the originating path. 782 * However, it is not always the case, since 783 * some versions of MGETHDR() does not 784 * initialize the field. 785 */ 786 m->m_pkthdr.rcvif = NULL; 787 if (ip6_mforward(ip6, ifp, m) != 0) { 788 m_freem(m); 789 goto done; 790 } 791 } 792 } 793 /* 794 * Multicasts with a hoplimit of zero may be looped back, 795 * above, but must not be transmitted on a network. 796 * Also, multicasts addressed to the loopback interface 797 * are not sent -- the above call to ip6_mloopback() will 798 * loop back a copy if this host actually belongs to the 799 * destination group on the loopback interface. 800 */ 801 if (ip6->ip6_hlim == 0 || (ifp->if_flags & IFF_LOOPBACK) || 802 IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst)) { 803 m_freem(m); 804 goto done; 805 } 806 } 807 808 /* 809 * Fill the outgoing inteface to tell the upper layer 810 * to increment per-interface statistics. 811 */ 812 if (ifpp) 813 *ifpp = ifp; 814 815 /* Determine path MTU. */ 816 if ((error = ip6_getpmtu(ro_pmtu, ro, ifp, &finaldst, &mtu, 817 &alwaysfrag, inp ? inp->inp_inc.inc_fibnum : M_GETFIB(m))) != 0) 818 goto bad; 819 820 /* 821 * The caller of this function may specify to use the minimum MTU 822 * in some cases. 823 * An advanced API option (IPV6_USE_MIN_MTU) can also override MTU 824 * setting. The logic is a bit complicated; by default, unicast 825 * packets will follow path MTU while multicast packets will be sent at 826 * the minimum MTU. If IP6PO_MINMTU_ALL is specified, all packets 827 * including unicast ones will be sent at the minimum MTU. Multicast 828 * packets will always be sent at the minimum MTU unless 829 * IP6PO_MINMTU_DISABLE is explicitly specified. 830 * See RFC 3542 for more details. 831 */ 832 if (mtu > IPV6_MMTU) { 833 if ((flags & IPV6_MINMTU)) 834 mtu = IPV6_MMTU; 835 else if (opt && opt->ip6po_minmtu == IP6PO_MINMTU_ALL) 836 mtu = IPV6_MMTU; 837 else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) && 838 (opt == NULL || 839 opt->ip6po_minmtu != IP6PO_MINMTU_DISABLE)) { 840 mtu = IPV6_MMTU; 841 } 842 } 843 844 /* 845 * clear embedded scope identifiers if necessary. 846 * in6_clearscope will touch the addresses only when necessary. 847 */ 848 in6_clearscope(&ip6->ip6_src); 849 in6_clearscope(&ip6->ip6_dst); 850 851 /* 852 * If the outgoing packet contains a hop-by-hop options header, 853 * it must be examined and processed even by the source node. 854 * (RFC 2460, section 4.) 855 */ 856 if (exthdrs.ip6e_hbh) { 857 struct ip6_hbh *hbh = mtod(exthdrs.ip6e_hbh, struct ip6_hbh *); 858 u_int32_t dummy; /* XXX unused */ 859 u_int32_t plen = 0; /* XXX: ip6_process will check the value */ 860 861 #ifdef DIAGNOSTIC 862 if ((hbh->ip6h_len + 1) << 3 > exthdrs.ip6e_hbh->m_len) 863 panic("ip6e_hbh is not contiguous"); 864 #endif 865 /* 866 * XXX: if we have to send an ICMPv6 error to the sender, 867 * we need the M_LOOP flag since icmp6_error() expects 868 * the IPv6 and the hop-by-hop options header are 869 * contiguous unless the flag is set. 870 */ 871 m->m_flags |= M_LOOP; 872 m->m_pkthdr.rcvif = ifp; 873 if (ip6_process_hopopts(m, (u_int8_t *)(hbh + 1), 874 ((hbh->ip6h_len + 1) << 3) - sizeof(struct ip6_hbh), 875 &dummy, &plen) < 0) { 876 /* m was already freed at this point */ 877 error = EINVAL;/* better error? */ 878 goto done; 879 } 880 m->m_flags &= ~M_LOOP; /* XXX */ 881 m->m_pkthdr.rcvif = NULL; 882 } 883 884 /* Jump over all PFIL processing if hooks are not active. */ 885 if (!PFIL_HOOKED(&V_inet6_pfil_hook)) 886 goto passout; 887 888 odst = ip6->ip6_dst; 889 /* Run through list of hooks for output packets. */ 890 error = pfil_run_hooks(&V_inet6_pfil_hook, &m, ifp, PFIL_OUT, inp); 891 if (error != 0 || m == NULL) 892 goto done; 893 ip6 = mtod(m, struct ip6_hdr *); 894 895 /* See if destination IP address was changed by packet filter. */ 896 if (!IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst)) { 897 m->m_flags |= M_SKIP_FIREWALL; 898 /* If destination is now ourself drop to ip6_input(). */ 899 if (in6_localip(&ip6->ip6_dst)) { 900 m->m_flags |= M_FASTFWD_OURS; 901 if (m->m_pkthdr.rcvif == NULL) 902 m->m_pkthdr.rcvif = V_loif; 903 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6) { 904 m->m_pkthdr.csum_flags |= 905 CSUM_DATA_VALID_IPV6 | CSUM_PSEUDO_HDR; 906 m->m_pkthdr.csum_data = 0xffff; 907 } 908 #ifdef SCTP 909 if (m->m_pkthdr.csum_flags & CSUM_SCTP_IPV6) 910 m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID; 911 #endif 912 error = netisr_queue(NETISR_IPV6, m); 913 goto done; 914 } else 915 goto again; /* Redo the routing table lookup. */ 916 } 917 918 #ifdef IPFIREWALL_FORWARD 919 /* See if local, if yes, send it to netisr. */ 920 if (m->m_flags & M_FASTFWD_OURS) { 921 if (m->m_pkthdr.rcvif == NULL) 922 m->m_pkthdr.rcvif = V_loif; 923 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6) { 924 m->m_pkthdr.csum_flags |= 925 CSUM_DATA_VALID_IPV6 | CSUM_PSEUDO_HDR; 926 m->m_pkthdr.csum_data = 0xffff; 927 } 928 #ifdef SCTP 929 if (m->m_pkthdr.csum_flags & CSUM_SCTP_IPV6) 930 m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID; 931 #endif 932 error = netisr_queue(NETISR_IPV6, m); 933 goto done; 934 } 935 /* Or forward to some other address? */ 936 fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL); 937 if (fwd_tag) { 938 dst = (struct sockaddr_in6 *)&ro->ro_dst; 939 bcopy((fwd_tag+1), dst, sizeof(struct sockaddr_in6)); 940 m->m_flags |= M_SKIP_FIREWALL; 941 m_tag_delete(m, fwd_tag); 942 goto again; 943 } 944 #endif /* IPFIREWALL_FORWARD */ 945 946 passout: 947 /* 948 * Send the packet to the outgoing interface. 949 * If necessary, do IPv6 fragmentation before sending. 950 * 951 * the logic here is rather complex: 952 * 1: normal case (dontfrag == 0, alwaysfrag == 0) 953 * 1-a: send as is if tlen <= path mtu 954 * 1-b: fragment if tlen > path mtu 955 * 956 * 2: if user asks us not to fragment (dontfrag == 1) 957 * 2-a: send as is if tlen <= interface mtu 958 * 2-b: error if tlen > interface mtu 959 * 960 * 3: if we always need to attach fragment header (alwaysfrag == 1) 961 * always fragment 962 * 963 * 4: if dontfrag == 1 && alwaysfrag == 1 964 * error, as we cannot handle this conflicting request 965 */ 966 sw_csum = m->m_pkthdr.csum_flags; 967 if (!hdrsplit) { 968 tso = ((sw_csum & ifp->if_hwassist & CSUM_TSO) != 0) ? 1 : 0; 969 sw_csum &= ~ifp->if_hwassist; 970 } else 971 tso = 0; 972 /* 973 * If we added extension headers, we will not do TSO and calculate the 974 * checksums ourselves for now. 975 * XXX-BZ Need a framework to know when the NIC can handle it, even 976 * with ext. hdrs. 977 */ 978 if (sw_csum & CSUM_DELAY_DATA_IPV6) { 979 sw_csum &= ~CSUM_DELAY_DATA_IPV6; 980 in6_delayed_cksum(m, plen, sizeof(struct ip6_hdr)); 981 } 982 #ifdef SCTP 983 if (sw_csum & CSUM_SCTP_IPV6) { 984 sw_csum &= ~CSUM_SCTP_IPV6; 985 sctp_delayed_cksum(m, sizeof(struct ip6_hdr)); 986 } 987 #endif 988 m->m_pkthdr.csum_flags &= ifp->if_hwassist; 989 tlen = m->m_pkthdr.len; 990 991 if ((opt && (opt->ip6po_flags & IP6PO_DONTFRAG)) || tso) 992 dontfrag = 1; 993 else 994 dontfrag = 0; 995 if (dontfrag && alwaysfrag) { /* case 4 */ 996 /* conflicting request - can't transmit */ 997 error = EMSGSIZE; 998 goto bad; 999 } 1000 if (dontfrag && tlen > IN6_LINKMTU(ifp) && !tso) { /* case 2-b */ 1001 /* 1002 * Even if the DONTFRAG option is specified, we cannot send the 1003 * packet when the data length is larger than the MTU of the 1004 * outgoing interface. 1005 * Notify the error by sending IPV6_PATHMTU ancillary data as 1006 * well as returning an error code (the latter is not described 1007 * in the API spec.) 1008 */ 1009 u_int32_t mtu32; 1010 struct ip6ctlparam ip6cp; 1011 1012 mtu32 = (u_int32_t)mtu; 1013 bzero(&ip6cp, sizeof(ip6cp)); 1014 ip6cp.ip6c_cmdarg = (void *)&mtu32; 1015 pfctlinput2(PRC_MSGSIZE, (struct sockaddr *)&ro_pmtu->ro_dst, 1016 (void *)&ip6cp); 1017 1018 error = EMSGSIZE; 1019 goto bad; 1020 } 1021 1022 /* 1023 * transmit packet without fragmentation 1024 */ 1025 if (dontfrag || (!alwaysfrag && tlen <= mtu)) { /* case 1-a and 2-a */ 1026 struct in6_ifaddr *ia6; 1027 1028 ip6 = mtod(m, struct ip6_hdr *); 1029 ia6 = in6_ifawithifp(ifp, &ip6->ip6_src); 1030 if (ia6) { 1031 /* Record statistics for this interface address. */ 1032 ia6->ia_ifa.if_opackets++; 1033 ia6->ia_ifa.if_obytes += m->m_pkthdr.len; 1034 ifa_free(&ia6->ia_ifa); 1035 } 1036 error = nd6_output(ifp, origifp, m, dst, ro->ro_rt); 1037 goto done; 1038 } 1039 1040 /* 1041 * try to fragment the packet. case 1-b and 3 1042 */ 1043 if (mtu < IPV6_MMTU) { 1044 /* path MTU cannot be less than IPV6_MMTU */ 1045 error = EMSGSIZE; 1046 in6_ifstat_inc(ifp, ifs6_out_fragfail); 1047 goto bad; 1048 } else if (ip6->ip6_plen == 0) { 1049 /* jumbo payload cannot be fragmented */ 1050 error = EMSGSIZE; 1051 in6_ifstat_inc(ifp, ifs6_out_fragfail); 1052 goto bad; 1053 } else { 1054 struct mbuf **mnext, *m_frgpart; 1055 struct ip6_frag *ip6f; 1056 u_int32_t id = htonl(ip6_randomid()); 1057 u_char nextproto; 1058 1059 int qslots = ifp->if_snd.ifq_maxlen - ifp->if_snd.ifq_len; 1060 1061 /* 1062 * Too large for the destination or interface; 1063 * fragment if possible. 1064 * Must be able to put at least 8 bytes per fragment. 1065 */ 1066 hlen = unfragpartlen; 1067 if (mtu > IPV6_MAXPACKET) 1068 mtu = IPV6_MAXPACKET; 1069 1070 len = (mtu - hlen - sizeof(struct ip6_frag)) & ~7; 1071 if (len < 8) { 1072 error = EMSGSIZE; 1073 in6_ifstat_inc(ifp, ifs6_out_fragfail); 1074 goto bad; 1075 } 1076 1077 /* 1078 * Verify that we have any chance at all of being able to queue 1079 * the packet or packet fragments 1080 */ 1081 if (qslots <= 0 || ((u_int)qslots * (mtu - hlen) 1082 < tlen /* - hlen */)) { 1083 error = ENOBUFS; 1084 V_ip6stat.ip6s_odropped++; 1085 goto bad; 1086 } 1087 1088 1089 /* 1090 * If the interface will not calculate checksums on 1091 * fragmented packets, then do it here. 1092 * XXX-BZ handle the hw offloading case. Need flags. 1093 */ 1094 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6) { 1095 in6_delayed_cksum(m, plen, hlen); 1096 m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA_IPV6; 1097 } 1098 #ifdef SCTP 1099 if (m->m_pkthdr.csum_flags & CSUM_SCTP_IPV6) { 1100 sctp_delayed_cksum(m, hlen); 1101 m->m_pkthdr.csum_flags &= ~CSUM_SCTP_IPV6; 1102 } 1103 #endif 1104 mnext = &m->m_nextpkt; 1105 1106 /* 1107 * Change the next header field of the last header in the 1108 * unfragmentable part. 1109 */ 1110 if (exthdrs.ip6e_rthdr) { 1111 nextproto = *mtod(exthdrs.ip6e_rthdr, u_char *); 1112 *mtod(exthdrs.ip6e_rthdr, u_char *) = IPPROTO_FRAGMENT; 1113 } else if (exthdrs.ip6e_dest1) { 1114 nextproto = *mtod(exthdrs.ip6e_dest1, u_char *); 1115 *mtod(exthdrs.ip6e_dest1, u_char *) = IPPROTO_FRAGMENT; 1116 } else if (exthdrs.ip6e_hbh) { 1117 nextproto = *mtod(exthdrs.ip6e_hbh, u_char *); 1118 *mtod(exthdrs.ip6e_hbh, u_char *) = IPPROTO_FRAGMENT; 1119 } else { 1120 nextproto = ip6->ip6_nxt; 1121 ip6->ip6_nxt = IPPROTO_FRAGMENT; 1122 } 1123 1124 /* 1125 * Loop through length of segment after first fragment, 1126 * make new header and copy data of each part and link onto 1127 * chain. 1128 */ 1129 m0 = m; 1130 for (off = hlen; off < tlen; off += len) { 1131 MGETHDR(m, M_DONTWAIT, MT_HEADER); 1132 if (!m) { 1133 error = ENOBUFS; 1134 V_ip6stat.ip6s_odropped++; 1135 goto sendorfree; 1136 } 1137 m->m_pkthdr.rcvif = NULL; 1138 m->m_flags = m0->m_flags & M_COPYFLAGS; /* incl. FIB */ 1139 *mnext = m; 1140 mnext = &m->m_nextpkt; 1141 m->m_data += max_linkhdr; 1142 mhip6 = mtod(m, struct ip6_hdr *); 1143 *mhip6 = *ip6; 1144 m->m_len = sizeof(*mhip6); 1145 error = ip6_insertfraghdr(m0, m, hlen, &ip6f); 1146 if (error) { 1147 V_ip6stat.ip6s_odropped++; 1148 goto sendorfree; 1149 } 1150 ip6f->ip6f_offlg = htons((u_short)((off - hlen) & ~7)); 1151 if (off + len >= tlen) 1152 len = tlen - off; 1153 else 1154 ip6f->ip6f_offlg |= IP6F_MORE_FRAG; 1155 mhip6->ip6_plen = htons((u_short)(len + hlen + 1156 sizeof(*ip6f) - sizeof(struct ip6_hdr))); 1157 if ((m_frgpart = m_copy(m0, off, len)) == 0) { 1158 error = ENOBUFS; 1159 V_ip6stat.ip6s_odropped++; 1160 goto sendorfree; 1161 } 1162 m_cat(m, m_frgpart); 1163 m->m_pkthdr.len = len + hlen + sizeof(*ip6f); 1164 m->m_pkthdr.rcvif = NULL; 1165 ip6f->ip6f_reserved = 0; 1166 ip6f->ip6f_ident = id; 1167 ip6f->ip6f_nxt = nextproto; 1168 V_ip6stat.ip6s_ofragments++; 1169 in6_ifstat_inc(ifp, ifs6_out_fragcreat); 1170 } 1171 1172 in6_ifstat_inc(ifp, ifs6_out_fragok); 1173 } 1174 1175 /* 1176 * Remove leading garbages. 1177 */ 1178 sendorfree: 1179 m = m0->m_nextpkt; 1180 m0->m_nextpkt = 0; 1181 m_freem(m0); 1182 for (m0 = m; m; m = m0) { 1183 m0 = m->m_nextpkt; 1184 m->m_nextpkt = 0; 1185 if (error == 0) { 1186 /* Record statistics for this interface address. */ 1187 if (ia) { 1188 ia->ia_ifa.if_opackets++; 1189 ia->ia_ifa.if_obytes += m->m_pkthdr.len; 1190 } 1191 error = nd6_output(ifp, origifp, m, dst, ro->ro_rt); 1192 } else 1193 m_freem(m); 1194 } 1195 1196 if (error == 0) 1197 V_ip6stat.ip6s_fragmented++; 1198 1199 done: 1200 if (ro == &ip6route && ro->ro_rt && flevalid == 0) { 1201 /* brace necessary for RTFREE */ 1202 RTFREE(ro->ro_rt); 1203 } else if (ro_pmtu == &ip6route && ro_pmtu->ro_rt && 1204 ((flevalid == 0) || (ro_pmtu != ro))) { 1205 RTFREE(ro_pmtu->ro_rt); 1206 } 1207 #ifdef IPSEC 1208 if (sp != NULL) 1209 KEY_FREESP(&sp); 1210 #endif 1211 1212 return (error); 1213 1214 freehdrs: 1215 m_freem(exthdrs.ip6e_hbh); /* m_freem will check if mbuf is 0 */ 1216 m_freem(exthdrs.ip6e_dest1); 1217 m_freem(exthdrs.ip6e_rthdr); 1218 m_freem(exthdrs.ip6e_dest2); 1219 /* FALLTHROUGH */ 1220 bad: 1221 if (m) 1222 m_freem(m); 1223 goto done; 1224 } 1225 1226 static int 1227 ip6_copyexthdr(struct mbuf **mp, caddr_t hdr, int hlen) 1228 { 1229 struct mbuf *m; 1230 1231 if (hlen > MCLBYTES) 1232 return (ENOBUFS); /* XXX */ 1233 1234 MGET(m, M_DONTWAIT, MT_DATA); 1235 if (!m) 1236 return (ENOBUFS); 1237 1238 if (hlen > MLEN) { 1239 MCLGET(m, M_DONTWAIT); 1240 if ((m->m_flags & M_EXT) == 0) { 1241 m_free(m); 1242 return (ENOBUFS); 1243 } 1244 } 1245 m->m_len = hlen; 1246 if (hdr) 1247 bcopy(hdr, mtod(m, caddr_t), hlen); 1248 1249 *mp = m; 1250 return (0); 1251 } 1252 1253 /* 1254 * Insert jumbo payload option. 1255 */ 1256 static int 1257 ip6_insert_jumboopt(struct ip6_exthdrs *exthdrs, u_int32_t plen) 1258 { 1259 struct mbuf *mopt; 1260 u_char *optbuf; 1261 u_int32_t v; 1262 1263 #define JUMBOOPTLEN 8 /* length of jumbo payload option and padding */ 1264 1265 /* 1266 * If there is no hop-by-hop options header, allocate new one. 1267 * If there is one but it doesn't have enough space to store the 1268 * jumbo payload option, allocate a cluster to store the whole options. 1269 * Otherwise, use it to store the options. 1270 */ 1271 if (exthdrs->ip6e_hbh == 0) { 1272 MGET(mopt, M_DONTWAIT, MT_DATA); 1273 if (mopt == 0) 1274 return (ENOBUFS); 1275 mopt->m_len = JUMBOOPTLEN; 1276 optbuf = mtod(mopt, u_char *); 1277 optbuf[1] = 0; /* = ((JUMBOOPTLEN) >> 3) - 1 */ 1278 exthdrs->ip6e_hbh = mopt; 1279 } else { 1280 struct ip6_hbh *hbh; 1281 1282 mopt = exthdrs->ip6e_hbh; 1283 if (M_TRAILINGSPACE(mopt) < JUMBOOPTLEN) { 1284 /* 1285 * XXX assumption: 1286 * - exthdrs->ip6e_hbh is not referenced from places 1287 * other than exthdrs. 1288 * - exthdrs->ip6e_hbh is not an mbuf chain. 1289 */ 1290 int oldoptlen = mopt->m_len; 1291 struct mbuf *n; 1292 1293 /* 1294 * XXX: give up if the whole (new) hbh header does 1295 * not fit even in an mbuf cluster. 1296 */ 1297 if (oldoptlen + JUMBOOPTLEN > MCLBYTES) 1298 return (ENOBUFS); 1299 1300 /* 1301 * As a consequence, we must always prepare a cluster 1302 * at this point. 1303 */ 1304 MGET(n, M_DONTWAIT, MT_DATA); 1305 if (n) { 1306 MCLGET(n, M_DONTWAIT); 1307 if ((n->m_flags & M_EXT) == 0) { 1308 m_freem(n); 1309 n = NULL; 1310 } 1311 } 1312 if (!n) 1313 return (ENOBUFS); 1314 n->m_len = oldoptlen + JUMBOOPTLEN; 1315 bcopy(mtod(mopt, caddr_t), mtod(n, caddr_t), 1316 oldoptlen); 1317 optbuf = mtod(n, caddr_t) + oldoptlen; 1318 m_freem(mopt); 1319 mopt = exthdrs->ip6e_hbh = n; 1320 } else { 1321 optbuf = mtod(mopt, u_char *) + mopt->m_len; 1322 mopt->m_len += JUMBOOPTLEN; 1323 } 1324 optbuf[0] = IP6OPT_PADN; 1325 optbuf[1] = 1; 1326 1327 /* 1328 * Adjust the header length according to the pad and 1329 * the jumbo payload option. 1330 */ 1331 hbh = mtod(mopt, struct ip6_hbh *); 1332 hbh->ip6h_len += (JUMBOOPTLEN >> 3); 1333 } 1334 1335 /* fill in the option. */ 1336 optbuf[2] = IP6OPT_JUMBO; 1337 optbuf[3] = 4; 1338 v = (u_int32_t)htonl(plen + JUMBOOPTLEN); 1339 bcopy(&v, &optbuf[4], sizeof(u_int32_t)); 1340 1341 /* finally, adjust the packet header length */ 1342 exthdrs->ip6e_ip6->m_pkthdr.len += JUMBOOPTLEN; 1343 1344 return (0); 1345 #undef JUMBOOPTLEN 1346 } 1347 1348 /* 1349 * Insert fragment header and copy unfragmentable header portions. 1350 */ 1351 static int 1352 ip6_insertfraghdr(struct mbuf *m0, struct mbuf *m, int hlen, 1353 struct ip6_frag **frghdrp) 1354 { 1355 struct mbuf *n, *mlast; 1356 1357 if (hlen > sizeof(struct ip6_hdr)) { 1358 n = m_copym(m0, sizeof(struct ip6_hdr), 1359 hlen - sizeof(struct ip6_hdr), M_DONTWAIT); 1360 if (n == 0) 1361 return (ENOBUFS); 1362 m->m_next = n; 1363 } else 1364 n = m; 1365 1366 /* Search for the last mbuf of unfragmentable part. */ 1367 for (mlast = n; mlast->m_next; mlast = mlast->m_next) 1368 ; 1369 1370 if ((mlast->m_flags & M_EXT) == 0 && 1371 M_TRAILINGSPACE(mlast) >= sizeof(struct ip6_frag)) { 1372 /* use the trailing space of the last mbuf for the fragment hdr */ 1373 *frghdrp = (struct ip6_frag *)(mtod(mlast, caddr_t) + 1374 mlast->m_len); 1375 mlast->m_len += sizeof(struct ip6_frag); 1376 m->m_pkthdr.len += sizeof(struct ip6_frag); 1377 } else { 1378 /* allocate a new mbuf for the fragment header */ 1379 struct mbuf *mfrg; 1380 1381 MGET(mfrg, M_DONTWAIT, MT_DATA); 1382 if (mfrg == 0) 1383 return (ENOBUFS); 1384 mfrg->m_len = sizeof(struct ip6_frag); 1385 *frghdrp = mtod(mfrg, struct ip6_frag *); 1386 mlast->m_next = mfrg; 1387 } 1388 1389 return (0); 1390 } 1391 1392 static int 1393 ip6_getpmtu(struct route_in6 *ro_pmtu, struct route_in6 *ro, 1394 struct ifnet *ifp, struct in6_addr *dst, u_long *mtup, 1395 int *alwaysfragp, u_int fibnum) 1396 { 1397 u_int32_t mtu = 0; 1398 int alwaysfrag = 0; 1399 int error = 0; 1400 1401 if (ro_pmtu != ro) { 1402 /* The first hop and the final destination may differ. */ 1403 struct sockaddr_in6 *sa6_dst = 1404 (struct sockaddr_in6 *)&ro_pmtu->ro_dst; 1405 if (ro_pmtu->ro_rt && 1406 ((ro_pmtu->ro_rt->rt_flags & RTF_UP) == 0 || 1407 !IN6_ARE_ADDR_EQUAL(&sa6_dst->sin6_addr, dst))) { 1408 RTFREE(ro_pmtu->ro_rt); 1409 ro_pmtu->ro_rt = (struct rtentry *)NULL; 1410 } 1411 if (ro_pmtu->ro_rt == NULL) { 1412 bzero(sa6_dst, sizeof(*sa6_dst)); 1413 sa6_dst->sin6_family = AF_INET6; 1414 sa6_dst->sin6_len = sizeof(struct sockaddr_in6); 1415 sa6_dst->sin6_addr = *dst; 1416 1417 in6_rtalloc(ro_pmtu, fibnum); 1418 } 1419 } 1420 if (ro_pmtu->ro_rt) { 1421 u_int32_t ifmtu; 1422 struct in_conninfo inc; 1423 1424 bzero(&inc, sizeof(inc)); 1425 inc.inc_flags |= INC_ISIPV6; 1426 inc.inc6_faddr = *dst; 1427 1428 if (ifp == NULL) 1429 ifp = ro_pmtu->ro_rt->rt_ifp; 1430 ifmtu = IN6_LINKMTU(ifp); 1431 mtu = tcp_hc_getmtu(&inc); 1432 if (mtu) 1433 mtu = min(mtu, ro_pmtu->ro_rt->rt_rmx.rmx_mtu); 1434 else 1435 mtu = ro_pmtu->ro_rt->rt_rmx.rmx_mtu; 1436 if (mtu == 0) 1437 mtu = ifmtu; 1438 else if (mtu < IPV6_MMTU) { 1439 /* 1440 * RFC2460 section 5, last paragraph: 1441 * if we record ICMPv6 too big message with 1442 * mtu < IPV6_MMTU, transmit packets sized IPV6_MMTU 1443 * or smaller, with framgent header attached. 1444 * (fragment header is needed regardless from the 1445 * packet size, for translators to identify packets) 1446 */ 1447 alwaysfrag = 1; 1448 mtu = IPV6_MMTU; 1449 } else if (mtu > ifmtu) { 1450 /* 1451 * The MTU on the route is larger than the MTU on 1452 * the interface! This shouldn't happen, unless the 1453 * MTU of the interface has been changed after the 1454 * interface was brought up. Change the MTU in the 1455 * route to match the interface MTU (as long as the 1456 * field isn't locked). 1457 */ 1458 mtu = ifmtu; 1459 ro_pmtu->ro_rt->rt_rmx.rmx_mtu = mtu; 1460 } 1461 } else if (ifp) { 1462 mtu = IN6_LINKMTU(ifp); 1463 } else 1464 error = EHOSTUNREACH; /* XXX */ 1465 1466 *mtup = mtu; 1467 if (alwaysfragp) 1468 *alwaysfragp = alwaysfrag; 1469 return (error); 1470 } 1471 1472 /* 1473 * IP6 socket option processing. 1474 */ 1475 int 1476 ip6_ctloutput(struct socket *so, struct sockopt *sopt) 1477 { 1478 int optdatalen, uproto; 1479 void *optdata; 1480 struct inpcb *in6p = sotoinpcb(so); 1481 int error, optval; 1482 int level, op, optname; 1483 int optlen; 1484 struct thread *td; 1485 1486 level = sopt->sopt_level; 1487 op = sopt->sopt_dir; 1488 optname = sopt->sopt_name; 1489 optlen = sopt->sopt_valsize; 1490 td = sopt->sopt_td; 1491 error = 0; 1492 optval = 0; 1493 uproto = (int)so->so_proto->pr_protocol; 1494 1495 if (level != IPPROTO_IPV6) { 1496 error = EINVAL; 1497 1498 if (sopt->sopt_level == SOL_SOCKET && 1499 sopt->sopt_dir == SOPT_SET) { 1500 switch (sopt->sopt_name) { 1501 case SO_REUSEADDR: 1502 INP_WLOCK(in6p); 1503 if (IN_MULTICAST(ntohl(in6p->inp_laddr.s_addr))) { 1504 if ((so->so_options & 1505 (SO_REUSEADDR | SO_REUSEPORT)) != 0) 1506 in6p->inp_flags2 |= INP_REUSEPORT; 1507 else 1508 in6p->inp_flags2 &= ~INP_REUSEPORT; 1509 } 1510 INP_WUNLOCK(in6p); 1511 error = 0; 1512 break; 1513 case SO_REUSEPORT: 1514 INP_WLOCK(in6p); 1515 if ((so->so_options & SO_REUSEPORT) != 0) 1516 in6p->inp_flags2 |= INP_REUSEPORT; 1517 else 1518 in6p->inp_flags2 &= ~INP_REUSEPORT; 1519 INP_WUNLOCK(in6p); 1520 error = 0; 1521 break; 1522 case SO_SETFIB: 1523 INP_WLOCK(in6p); 1524 in6p->inp_inc.inc_fibnum = so->so_fibnum; 1525 INP_WUNLOCK(in6p); 1526 error = 0; 1527 break; 1528 default: 1529 break; 1530 } 1531 } 1532 } else { /* level == IPPROTO_IPV6 */ 1533 switch (op) { 1534 1535 case SOPT_SET: 1536 switch (optname) { 1537 case IPV6_2292PKTOPTIONS: 1538 #ifdef IPV6_PKTOPTIONS 1539 case IPV6_PKTOPTIONS: 1540 #endif 1541 { 1542 struct mbuf *m; 1543 1544 error = soopt_getm(sopt, &m); /* XXX */ 1545 if (error != 0) 1546 break; 1547 error = soopt_mcopyin(sopt, m); /* XXX */ 1548 if (error != 0) 1549 break; 1550 error = ip6_pcbopts(&in6p->in6p_outputopts, 1551 m, so, sopt); 1552 m_freem(m); /* XXX */ 1553 break; 1554 } 1555 1556 /* 1557 * Use of some Hop-by-Hop options or some 1558 * Destination options, might require special 1559 * privilege. That is, normal applications 1560 * (without special privilege) might be forbidden 1561 * from setting certain options in outgoing packets, 1562 * and might never see certain options in received 1563 * packets. [RFC 2292 Section 6] 1564 * KAME specific note: 1565 * KAME prevents non-privileged users from sending or 1566 * receiving ANY hbh/dst options in order to avoid 1567 * overhead of parsing options in the kernel. 1568 */ 1569 case IPV6_RECVHOPOPTS: 1570 case IPV6_RECVDSTOPTS: 1571 case IPV6_RECVRTHDRDSTOPTS: 1572 if (td != NULL) { 1573 error = priv_check(td, 1574 PRIV_NETINET_SETHDROPTS); 1575 if (error) 1576 break; 1577 } 1578 /* FALLTHROUGH */ 1579 case IPV6_UNICAST_HOPS: 1580 case IPV6_HOPLIMIT: 1581 case IPV6_FAITH: 1582 1583 case IPV6_RECVPKTINFO: 1584 case IPV6_RECVHOPLIMIT: 1585 case IPV6_RECVRTHDR: 1586 case IPV6_RECVPATHMTU: 1587 case IPV6_RECVTCLASS: 1588 case IPV6_V6ONLY: 1589 case IPV6_AUTOFLOWLABEL: 1590 case IPV6_BINDANY: 1591 if (optname == IPV6_BINDANY && td != NULL) { 1592 error = priv_check(td, 1593 PRIV_NETINET_BINDANY); 1594 if (error) 1595 break; 1596 } 1597 1598 if (optlen != sizeof(int)) { 1599 error = EINVAL; 1600 break; 1601 } 1602 error = sooptcopyin(sopt, &optval, 1603 sizeof optval, sizeof optval); 1604 if (error) 1605 break; 1606 switch (optname) { 1607 1608 case IPV6_UNICAST_HOPS: 1609 if (optval < -1 || optval >= 256) 1610 error = EINVAL; 1611 else { 1612 /* -1 = kernel default */ 1613 in6p->in6p_hops = optval; 1614 if ((in6p->inp_vflag & 1615 INP_IPV4) != 0) 1616 in6p->inp_ip_ttl = optval; 1617 } 1618 break; 1619 #define OPTSET(bit) \ 1620 do { \ 1621 if (optval) \ 1622 in6p->inp_flags |= (bit); \ 1623 else \ 1624 in6p->inp_flags &= ~(bit); \ 1625 } while (/*CONSTCOND*/ 0) 1626 #define OPTSET2292(bit) \ 1627 do { \ 1628 in6p->inp_flags |= IN6P_RFC2292; \ 1629 if (optval) \ 1630 in6p->inp_flags |= (bit); \ 1631 else \ 1632 in6p->inp_flags &= ~(bit); \ 1633 } while (/*CONSTCOND*/ 0) 1634 #define OPTBIT(bit) (in6p->inp_flags & (bit) ? 1 : 0) 1635 1636 case IPV6_RECVPKTINFO: 1637 /* cannot mix with RFC2292 */ 1638 if (OPTBIT(IN6P_RFC2292)) { 1639 error = EINVAL; 1640 break; 1641 } 1642 OPTSET(IN6P_PKTINFO); 1643 break; 1644 1645 case IPV6_HOPLIMIT: 1646 { 1647 struct ip6_pktopts **optp; 1648 1649 /* cannot mix with RFC2292 */ 1650 if (OPTBIT(IN6P_RFC2292)) { 1651 error = EINVAL; 1652 break; 1653 } 1654 optp = &in6p->in6p_outputopts; 1655 error = ip6_pcbopt(IPV6_HOPLIMIT, 1656 (u_char *)&optval, sizeof(optval), 1657 optp, (td != NULL) ? td->td_ucred : 1658 NULL, uproto); 1659 break; 1660 } 1661 1662 case IPV6_RECVHOPLIMIT: 1663 /* cannot mix with RFC2292 */ 1664 if (OPTBIT(IN6P_RFC2292)) { 1665 error = EINVAL; 1666 break; 1667 } 1668 OPTSET(IN6P_HOPLIMIT); 1669 break; 1670 1671 case IPV6_RECVHOPOPTS: 1672 /* cannot mix with RFC2292 */ 1673 if (OPTBIT(IN6P_RFC2292)) { 1674 error = EINVAL; 1675 break; 1676 } 1677 OPTSET(IN6P_HOPOPTS); 1678 break; 1679 1680 case IPV6_RECVDSTOPTS: 1681 /* cannot mix with RFC2292 */ 1682 if (OPTBIT(IN6P_RFC2292)) { 1683 error = EINVAL; 1684 break; 1685 } 1686 OPTSET(IN6P_DSTOPTS); 1687 break; 1688 1689 case IPV6_RECVRTHDRDSTOPTS: 1690 /* cannot mix with RFC2292 */ 1691 if (OPTBIT(IN6P_RFC2292)) { 1692 error = EINVAL; 1693 break; 1694 } 1695 OPTSET(IN6P_RTHDRDSTOPTS); 1696 break; 1697 1698 case IPV6_RECVRTHDR: 1699 /* cannot mix with RFC2292 */ 1700 if (OPTBIT(IN6P_RFC2292)) { 1701 error = EINVAL; 1702 break; 1703 } 1704 OPTSET(IN6P_RTHDR); 1705 break; 1706 1707 case IPV6_FAITH: 1708 OPTSET(INP_FAITH); 1709 break; 1710 1711 case IPV6_RECVPATHMTU: 1712 /* 1713 * We ignore this option for TCP 1714 * sockets. 1715 * (RFC3542 leaves this case 1716 * unspecified.) 1717 */ 1718 if (uproto != IPPROTO_TCP) 1719 OPTSET(IN6P_MTU); 1720 break; 1721 1722 case IPV6_V6ONLY: 1723 /* 1724 * make setsockopt(IPV6_V6ONLY) 1725 * available only prior to bind(2). 1726 * see ipng mailing list, Jun 22 2001. 1727 */ 1728 if (in6p->inp_lport || 1729 !IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) { 1730 error = EINVAL; 1731 break; 1732 } 1733 OPTSET(IN6P_IPV6_V6ONLY); 1734 if (optval) 1735 in6p->inp_vflag &= ~INP_IPV4; 1736 else 1737 in6p->inp_vflag |= INP_IPV4; 1738 break; 1739 case IPV6_RECVTCLASS: 1740 /* cannot mix with RFC2292 XXX */ 1741 if (OPTBIT(IN6P_RFC2292)) { 1742 error = EINVAL; 1743 break; 1744 } 1745 OPTSET(IN6P_TCLASS); 1746 break; 1747 case IPV6_AUTOFLOWLABEL: 1748 OPTSET(IN6P_AUTOFLOWLABEL); 1749 break; 1750 1751 case IPV6_BINDANY: 1752 OPTSET(INP_BINDANY); 1753 break; 1754 } 1755 break; 1756 1757 case IPV6_TCLASS: 1758 case IPV6_DONTFRAG: 1759 case IPV6_USE_MIN_MTU: 1760 case IPV6_PREFER_TEMPADDR: 1761 if (optlen != sizeof(optval)) { 1762 error = EINVAL; 1763 break; 1764 } 1765 error = sooptcopyin(sopt, &optval, 1766 sizeof optval, sizeof optval); 1767 if (error) 1768 break; 1769 { 1770 struct ip6_pktopts **optp; 1771 optp = &in6p->in6p_outputopts; 1772 error = ip6_pcbopt(optname, 1773 (u_char *)&optval, sizeof(optval), 1774 optp, (td != NULL) ? td->td_ucred : 1775 NULL, uproto); 1776 break; 1777 } 1778 1779 case IPV6_2292PKTINFO: 1780 case IPV6_2292HOPLIMIT: 1781 case IPV6_2292HOPOPTS: 1782 case IPV6_2292DSTOPTS: 1783 case IPV6_2292RTHDR: 1784 /* RFC 2292 */ 1785 if (optlen != sizeof(int)) { 1786 error = EINVAL; 1787 break; 1788 } 1789 error = sooptcopyin(sopt, &optval, 1790 sizeof optval, sizeof optval); 1791 if (error) 1792 break; 1793 switch (optname) { 1794 case IPV6_2292PKTINFO: 1795 OPTSET2292(IN6P_PKTINFO); 1796 break; 1797 case IPV6_2292HOPLIMIT: 1798 OPTSET2292(IN6P_HOPLIMIT); 1799 break; 1800 case IPV6_2292HOPOPTS: 1801 /* 1802 * Check super-user privilege. 1803 * See comments for IPV6_RECVHOPOPTS. 1804 */ 1805 if (td != NULL) { 1806 error = priv_check(td, 1807 PRIV_NETINET_SETHDROPTS); 1808 if (error) 1809 return (error); 1810 } 1811 OPTSET2292(IN6P_HOPOPTS); 1812 break; 1813 case IPV6_2292DSTOPTS: 1814 if (td != NULL) { 1815 error = priv_check(td, 1816 PRIV_NETINET_SETHDROPTS); 1817 if (error) 1818 return (error); 1819 } 1820 OPTSET2292(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); /* XXX */ 1821 break; 1822 case IPV6_2292RTHDR: 1823 OPTSET2292(IN6P_RTHDR); 1824 break; 1825 } 1826 break; 1827 case IPV6_PKTINFO: 1828 case IPV6_HOPOPTS: 1829 case IPV6_RTHDR: 1830 case IPV6_DSTOPTS: 1831 case IPV6_RTHDRDSTOPTS: 1832 case IPV6_NEXTHOP: 1833 { 1834 /* new advanced API (RFC3542) */ 1835 u_char *optbuf; 1836 u_char optbuf_storage[MCLBYTES]; 1837 int optlen; 1838 struct ip6_pktopts **optp; 1839 1840 /* cannot mix with RFC2292 */ 1841 if (OPTBIT(IN6P_RFC2292)) { 1842 error = EINVAL; 1843 break; 1844 } 1845 1846 /* 1847 * We only ensure valsize is not too large 1848 * here. Further validation will be done 1849 * later. 1850 */ 1851 error = sooptcopyin(sopt, optbuf_storage, 1852 sizeof(optbuf_storage), 0); 1853 if (error) 1854 break; 1855 optlen = sopt->sopt_valsize; 1856 optbuf = optbuf_storage; 1857 optp = &in6p->in6p_outputopts; 1858 error = ip6_pcbopt(optname, optbuf, optlen, 1859 optp, (td != NULL) ? td->td_ucred : NULL, 1860 uproto); 1861 break; 1862 } 1863 #undef OPTSET 1864 1865 case IPV6_MULTICAST_IF: 1866 case IPV6_MULTICAST_HOPS: 1867 case IPV6_MULTICAST_LOOP: 1868 case IPV6_JOIN_GROUP: 1869 case IPV6_LEAVE_GROUP: 1870 case IPV6_MSFILTER: 1871 case MCAST_BLOCK_SOURCE: 1872 case MCAST_UNBLOCK_SOURCE: 1873 case MCAST_JOIN_GROUP: 1874 case MCAST_LEAVE_GROUP: 1875 case MCAST_JOIN_SOURCE_GROUP: 1876 case MCAST_LEAVE_SOURCE_GROUP: 1877 error = ip6_setmoptions(in6p, sopt); 1878 break; 1879 1880 case IPV6_PORTRANGE: 1881 error = sooptcopyin(sopt, &optval, 1882 sizeof optval, sizeof optval); 1883 if (error) 1884 break; 1885 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 break; 1907 1908 #ifdef IPSEC 1909 case IPV6_IPSEC_POLICY: 1910 { 1911 caddr_t req; 1912 struct mbuf *m; 1913 1914 if ((error = soopt_getm(sopt, &m)) != 0) /* XXX */ 1915 break; 1916 if ((error = soopt_mcopyin(sopt, m)) != 0) /* XXX */ 1917 break; 1918 req = mtod(m, caddr_t); 1919 error = ipsec_set_policy(in6p, optname, req, 1920 m->m_len, (sopt->sopt_td != NULL) ? 1921 sopt->sopt_td->td_ucred : NULL); 1922 m_freem(m); 1923 break; 1924 } 1925 #endif /* IPSEC */ 1926 1927 default: 1928 error = ENOPROTOOPT; 1929 break; 1930 } 1931 break; 1932 1933 case SOPT_GET: 1934 switch (optname) { 1935 1936 case IPV6_2292PKTOPTIONS: 1937 #ifdef IPV6_PKTOPTIONS 1938 case IPV6_PKTOPTIONS: 1939 #endif 1940 /* 1941 * RFC3542 (effectively) deprecated the 1942 * semantics of the 2292-style pktoptions. 1943 * Since it was not reliable in nature (i.e., 1944 * applications had to expect the lack of some 1945 * information after all), it would make sense 1946 * to simplify this part by always returning 1947 * empty data. 1948 */ 1949 sopt->sopt_valsize = 0; 1950 break; 1951 1952 case IPV6_RECVHOPOPTS: 1953 case IPV6_RECVDSTOPTS: 1954 case IPV6_RECVRTHDRDSTOPTS: 1955 case IPV6_UNICAST_HOPS: 1956 case IPV6_RECVPKTINFO: 1957 case IPV6_RECVHOPLIMIT: 1958 case IPV6_RECVRTHDR: 1959 case IPV6_RECVPATHMTU: 1960 1961 case IPV6_FAITH: 1962 case IPV6_V6ONLY: 1963 case IPV6_PORTRANGE: 1964 case IPV6_RECVTCLASS: 1965 case IPV6_AUTOFLOWLABEL: 1966 case IPV6_BINDANY: 1967 switch (optname) { 1968 1969 case IPV6_RECVHOPOPTS: 1970 optval = OPTBIT(IN6P_HOPOPTS); 1971 break; 1972 1973 case IPV6_RECVDSTOPTS: 1974 optval = OPTBIT(IN6P_DSTOPTS); 1975 break; 1976 1977 case IPV6_RECVRTHDRDSTOPTS: 1978 optval = OPTBIT(IN6P_RTHDRDSTOPTS); 1979 break; 1980 1981 case IPV6_UNICAST_HOPS: 1982 optval = in6p->in6p_hops; 1983 break; 1984 1985 case IPV6_RECVPKTINFO: 1986 optval = OPTBIT(IN6P_PKTINFO); 1987 break; 1988 1989 case IPV6_RECVHOPLIMIT: 1990 optval = OPTBIT(IN6P_HOPLIMIT); 1991 break; 1992 1993 case IPV6_RECVRTHDR: 1994 optval = OPTBIT(IN6P_RTHDR); 1995 break; 1996 1997 case IPV6_RECVPATHMTU: 1998 optval = OPTBIT(IN6P_MTU); 1999 break; 2000 2001 case IPV6_FAITH: 2002 optval = OPTBIT(INP_FAITH); 2003 break; 2004 2005 case IPV6_V6ONLY: 2006 optval = OPTBIT(IN6P_IPV6_V6ONLY); 2007 break; 2008 2009 case IPV6_PORTRANGE: 2010 { 2011 int flags; 2012 flags = in6p->inp_flags; 2013 if (flags & INP_HIGHPORT) 2014 optval = IPV6_PORTRANGE_HIGH; 2015 else if (flags & INP_LOWPORT) 2016 optval = IPV6_PORTRANGE_LOW; 2017 else 2018 optval = 0; 2019 break; 2020 } 2021 case IPV6_RECVTCLASS: 2022 optval = OPTBIT(IN6P_TCLASS); 2023 break; 2024 2025 case IPV6_AUTOFLOWLABEL: 2026 optval = OPTBIT(IN6P_AUTOFLOWLABEL); 2027 break; 2028 2029 case IPV6_BINDANY: 2030 optval = OPTBIT(INP_BINDANY); 2031 break; 2032 } 2033 if (error) 2034 break; 2035 error = sooptcopyout(sopt, &optval, 2036 sizeof optval); 2037 break; 2038 2039 case IPV6_PATHMTU: 2040 { 2041 u_long pmtu = 0; 2042 struct ip6_mtuinfo mtuinfo; 2043 struct route_in6 sro; 2044 2045 bzero(&sro, sizeof(sro)); 2046 2047 if (!(so->so_state & SS_ISCONNECTED)) 2048 return (ENOTCONN); 2049 /* 2050 * XXX: we dot not consider the case of source 2051 * routing, or optional information to specify 2052 * the outgoing interface. 2053 */ 2054 error = ip6_getpmtu(&sro, NULL, NULL, 2055 &in6p->in6p_faddr, &pmtu, NULL, 2056 so->so_fibnum); 2057 if (sro.ro_rt) 2058 RTFREE(sro.ro_rt); 2059 if (error) 2060 break; 2061 if (pmtu > IPV6_MAXPACKET) 2062 pmtu = IPV6_MAXPACKET; 2063 2064 bzero(&mtuinfo, sizeof(mtuinfo)); 2065 mtuinfo.ip6m_mtu = (u_int32_t)pmtu; 2066 optdata = (void *)&mtuinfo; 2067 optdatalen = sizeof(mtuinfo); 2068 error = sooptcopyout(sopt, optdata, 2069 optdatalen); 2070 break; 2071 } 2072 2073 case IPV6_2292PKTINFO: 2074 case IPV6_2292HOPLIMIT: 2075 case IPV6_2292HOPOPTS: 2076 case IPV6_2292RTHDR: 2077 case IPV6_2292DSTOPTS: 2078 switch (optname) { 2079 case IPV6_2292PKTINFO: 2080 optval = OPTBIT(IN6P_PKTINFO); 2081 break; 2082 case IPV6_2292HOPLIMIT: 2083 optval = OPTBIT(IN6P_HOPLIMIT); 2084 break; 2085 case IPV6_2292HOPOPTS: 2086 optval = OPTBIT(IN6P_HOPOPTS); 2087 break; 2088 case IPV6_2292RTHDR: 2089 optval = OPTBIT(IN6P_RTHDR); 2090 break; 2091 case IPV6_2292DSTOPTS: 2092 optval = OPTBIT(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); 2093 break; 2094 } 2095 error = sooptcopyout(sopt, &optval, 2096 sizeof optval); 2097 break; 2098 case IPV6_PKTINFO: 2099 case IPV6_HOPOPTS: 2100 case IPV6_RTHDR: 2101 case IPV6_DSTOPTS: 2102 case IPV6_RTHDRDSTOPTS: 2103 case IPV6_NEXTHOP: 2104 case IPV6_TCLASS: 2105 case IPV6_DONTFRAG: 2106 case IPV6_USE_MIN_MTU: 2107 case IPV6_PREFER_TEMPADDR: 2108 error = ip6_getpcbopt(in6p->in6p_outputopts, 2109 optname, sopt); 2110 break; 2111 2112 case IPV6_MULTICAST_IF: 2113 case IPV6_MULTICAST_HOPS: 2114 case IPV6_MULTICAST_LOOP: 2115 case IPV6_MSFILTER: 2116 error = ip6_getmoptions(in6p, sopt); 2117 break; 2118 2119 #ifdef IPSEC 2120 case IPV6_IPSEC_POLICY: 2121 { 2122 caddr_t req = NULL; 2123 size_t len = 0; 2124 struct mbuf *m = NULL; 2125 struct mbuf **mp = &m; 2126 size_t ovalsize = sopt->sopt_valsize; 2127 caddr_t oval = (caddr_t)sopt->sopt_val; 2128 2129 error = soopt_getm(sopt, &m); /* XXX */ 2130 if (error != 0) 2131 break; 2132 error = soopt_mcopyin(sopt, m); /* XXX */ 2133 if (error != 0) 2134 break; 2135 sopt->sopt_valsize = ovalsize; 2136 sopt->sopt_val = oval; 2137 if (m) { 2138 req = mtod(m, caddr_t); 2139 len = m->m_len; 2140 } 2141 error = ipsec_get_policy(in6p, req, len, mp); 2142 if (error == 0) 2143 error = soopt_mcopyout(sopt, m); /* XXX */ 2144 if (error == 0 && m) 2145 m_freem(m); 2146 break; 2147 } 2148 #endif /* IPSEC */ 2149 2150 default: 2151 error = ENOPROTOOPT; 2152 break; 2153 } 2154 break; 2155 } 2156 } 2157 return (error); 2158 } 2159 2160 int 2161 ip6_raw_ctloutput(struct socket *so, struct sockopt *sopt) 2162 { 2163 int error = 0, optval, optlen; 2164 const int icmp6off = offsetof(struct icmp6_hdr, icmp6_cksum); 2165 struct inpcb *in6p = sotoinpcb(so); 2166 int level, op, optname; 2167 2168 level = sopt->sopt_level; 2169 op = sopt->sopt_dir; 2170 optname = sopt->sopt_name; 2171 optlen = sopt->sopt_valsize; 2172 2173 if (level != IPPROTO_IPV6) { 2174 return (EINVAL); 2175 } 2176 2177 switch (optname) { 2178 case IPV6_CHECKSUM: 2179 /* 2180 * For ICMPv6 sockets, no modification allowed for checksum 2181 * offset, permit "no change" values to help existing apps. 2182 * 2183 * RFC3542 says: "An attempt to set IPV6_CHECKSUM 2184 * for an ICMPv6 socket will fail." 2185 * The current behavior does not meet RFC3542. 2186 */ 2187 switch (op) { 2188 case SOPT_SET: 2189 if (optlen != sizeof(int)) { 2190 error = EINVAL; 2191 break; 2192 } 2193 error = sooptcopyin(sopt, &optval, sizeof(optval), 2194 sizeof(optval)); 2195 if (error) 2196 break; 2197 if ((optval % 2) != 0) { 2198 /* the API assumes even offset values */ 2199 error = EINVAL; 2200 } else if (so->so_proto->pr_protocol == 2201 IPPROTO_ICMPV6) { 2202 if (optval != icmp6off) 2203 error = EINVAL; 2204 } else 2205 in6p->in6p_cksum = optval; 2206 break; 2207 2208 case SOPT_GET: 2209 if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) 2210 optval = icmp6off; 2211 else 2212 optval = in6p->in6p_cksum; 2213 2214 error = sooptcopyout(sopt, &optval, sizeof(optval)); 2215 break; 2216 2217 default: 2218 error = EINVAL; 2219 break; 2220 } 2221 break; 2222 2223 default: 2224 error = ENOPROTOOPT; 2225 break; 2226 } 2227 2228 return (error); 2229 } 2230 2231 /* 2232 * Set up IP6 options in pcb for insertion in output packets or 2233 * specifying behavior of outgoing packets. 2234 */ 2235 static int 2236 ip6_pcbopts(struct ip6_pktopts **pktopt, struct mbuf *m, 2237 struct socket *so, struct sockopt *sopt) 2238 { 2239 struct ip6_pktopts *opt = *pktopt; 2240 int error = 0; 2241 struct thread *td = sopt->sopt_td; 2242 2243 /* turn off any old options. */ 2244 if (opt) { 2245 #ifdef DIAGNOSTIC 2246 if (opt->ip6po_pktinfo || opt->ip6po_nexthop || 2247 opt->ip6po_hbh || opt->ip6po_dest1 || opt->ip6po_dest2 || 2248 opt->ip6po_rhinfo.ip6po_rhi_rthdr) 2249 printf("ip6_pcbopts: all specified options are cleared.\n"); 2250 #endif 2251 ip6_clearpktopts(opt, -1); 2252 } else 2253 opt = malloc(sizeof(*opt), M_IP6OPT, M_WAITOK); 2254 *pktopt = NULL; 2255 2256 if (!m || m->m_len == 0) { 2257 /* 2258 * Only turning off any previous options, regardless of 2259 * whether the opt is just created or given. 2260 */ 2261 free(opt, M_IP6OPT); 2262 return (0); 2263 } 2264 2265 /* set options specified by user. */ 2266 if ((error = ip6_setpktopts(m, opt, NULL, (td != NULL) ? 2267 td->td_ucred : NULL, so->so_proto->pr_protocol)) != 0) { 2268 ip6_clearpktopts(opt, -1); /* XXX: discard all options */ 2269 free(opt, M_IP6OPT); 2270 return (error); 2271 } 2272 *pktopt = opt; 2273 return (0); 2274 } 2275 2276 /* 2277 * initialize ip6_pktopts. beware that there are non-zero default values in 2278 * the struct. 2279 */ 2280 void 2281 ip6_initpktopts(struct ip6_pktopts *opt) 2282 { 2283 2284 bzero(opt, sizeof(*opt)); 2285 opt->ip6po_hlim = -1; /* -1 means default hop limit */ 2286 opt->ip6po_tclass = -1; /* -1 means default traffic class */ 2287 opt->ip6po_minmtu = IP6PO_MINMTU_MCASTONLY; 2288 opt->ip6po_prefer_tempaddr = IP6PO_TEMPADDR_SYSTEM; 2289 } 2290 2291 static int 2292 ip6_pcbopt(int optname, u_char *buf, int len, struct ip6_pktopts **pktopt, 2293 struct ucred *cred, int uproto) 2294 { 2295 struct ip6_pktopts *opt; 2296 2297 if (*pktopt == NULL) { 2298 *pktopt = malloc(sizeof(struct ip6_pktopts), M_IP6OPT, 2299 M_WAITOK); 2300 ip6_initpktopts(*pktopt); 2301 } 2302 opt = *pktopt; 2303 2304 return (ip6_setpktopt(optname, buf, len, opt, cred, 1, 0, uproto)); 2305 } 2306 2307 static int 2308 ip6_getpcbopt(struct ip6_pktopts *pktopt, int optname, struct sockopt *sopt) 2309 { 2310 void *optdata = NULL; 2311 int optdatalen = 0; 2312 struct ip6_ext *ip6e; 2313 int error = 0; 2314 struct in6_pktinfo null_pktinfo; 2315 int deftclass = 0, on; 2316 int defminmtu = IP6PO_MINMTU_MCASTONLY; 2317 int defpreftemp = IP6PO_TEMPADDR_SYSTEM; 2318 2319 switch (optname) { 2320 case IPV6_PKTINFO: 2321 if (pktopt && pktopt->ip6po_pktinfo) 2322 optdata = (void *)pktopt->ip6po_pktinfo; 2323 else { 2324 /* XXX: we don't have to do this every time... */ 2325 bzero(&null_pktinfo, sizeof(null_pktinfo)); 2326 optdata = (void *)&null_pktinfo; 2327 } 2328 optdatalen = sizeof(struct in6_pktinfo); 2329 break; 2330 case IPV6_TCLASS: 2331 if (pktopt && pktopt->ip6po_tclass >= 0) 2332 optdata = (void *)&pktopt->ip6po_tclass; 2333 else 2334 optdata = (void *)&deftclass; 2335 optdatalen = sizeof(int); 2336 break; 2337 case IPV6_HOPOPTS: 2338 if (pktopt && pktopt->ip6po_hbh) { 2339 optdata = (void *)pktopt->ip6po_hbh; 2340 ip6e = (struct ip6_ext *)pktopt->ip6po_hbh; 2341 optdatalen = (ip6e->ip6e_len + 1) << 3; 2342 } 2343 break; 2344 case IPV6_RTHDR: 2345 if (pktopt && pktopt->ip6po_rthdr) { 2346 optdata = (void *)pktopt->ip6po_rthdr; 2347 ip6e = (struct ip6_ext *)pktopt->ip6po_rthdr; 2348 optdatalen = (ip6e->ip6e_len + 1) << 3; 2349 } 2350 break; 2351 case IPV6_RTHDRDSTOPTS: 2352 if (pktopt && pktopt->ip6po_dest1) { 2353 optdata = (void *)pktopt->ip6po_dest1; 2354 ip6e = (struct ip6_ext *)pktopt->ip6po_dest1; 2355 optdatalen = (ip6e->ip6e_len + 1) << 3; 2356 } 2357 break; 2358 case IPV6_DSTOPTS: 2359 if (pktopt && pktopt->ip6po_dest2) { 2360 optdata = (void *)pktopt->ip6po_dest2; 2361 ip6e = (struct ip6_ext *)pktopt->ip6po_dest2; 2362 optdatalen = (ip6e->ip6e_len + 1) << 3; 2363 } 2364 break; 2365 case IPV6_NEXTHOP: 2366 if (pktopt && pktopt->ip6po_nexthop) { 2367 optdata = (void *)pktopt->ip6po_nexthop; 2368 optdatalen = pktopt->ip6po_nexthop->sa_len; 2369 } 2370 break; 2371 case IPV6_USE_MIN_MTU: 2372 if (pktopt) 2373 optdata = (void *)&pktopt->ip6po_minmtu; 2374 else 2375 optdata = (void *)&defminmtu; 2376 optdatalen = sizeof(int); 2377 break; 2378 case IPV6_DONTFRAG: 2379 if (pktopt && ((pktopt->ip6po_flags) & IP6PO_DONTFRAG)) 2380 on = 1; 2381 else 2382 on = 0; 2383 optdata = (void *)&on; 2384 optdatalen = sizeof(on); 2385 break; 2386 case IPV6_PREFER_TEMPADDR: 2387 if (pktopt) 2388 optdata = (void *)&pktopt->ip6po_prefer_tempaddr; 2389 else 2390 optdata = (void *)&defpreftemp; 2391 optdatalen = sizeof(int); 2392 break; 2393 default: /* should not happen */ 2394 #ifdef DIAGNOSTIC 2395 panic("ip6_getpcbopt: unexpected option\n"); 2396 #endif 2397 return (ENOPROTOOPT); 2398 } 2399 2400 error = sooptcopyout(sopt, optdata, optdatalen); 2401 2402 return (error); 2403 } 2404 2405 void 2406 ip6_clearpktopts(struct ip6_pktopts *pktopt, int optname) 2407 { 2408 if (pktopt == NULL) 2409 return; 2410 2411 if (optname == -1 || optname == IPV6_PKTINFO) { 2412 if (pktopt->ip6po_pktinfo) 2413 free(pktopt->ip6po_pktinfo, M_IP6OPT); 2414 pktopt->ip6po_pktinfo = NULL; 2415 } 2416 if (optname == -1 || optname == IPV6_HOPLIMIT) 2417 pktopt->ip6po_hlim = -1; 2418 if (optname == -1 || optname == IPV6_TCLASS) 2419 pktopt->ip6po_tclass = -1; 2420 if (optname == -1 || optname == IPV6_NEXTHOP) { 2421 if (pktopt->ip6po_nextroute.ro_rt) { 2422 RTFREE(pktopt->ip6po_nextroute.ro_rt); 2423 pktopt->ip6po_nextroute.ro_rt = NULL; 2424 } 2425 if (pktopt->ip6po_nexthop) 2426 free(pktopt->ip6po_nexthop, M_IP6OPT); 2427 pktopt->ip6po_nexthop = NULL; 2428 } 2429 if (optname == -1 || optname == IPV6_HOPOPTS) { 2430 if (pktopt->ip6po_hbh) 2431 free(pktopt->ip6po_hbh, M_IP6OPT); 2432 pktopt->ip6po_hbh = NULL; 2433 } 2434 if (optname == -1 || optname == IPV6_RTHDRDSTOPTS) { 2435 if (pktopt->ip6po_dest1) 2436 free(pktopt->ip6po_dest1, M_IP6OPT); 2437 pktopt->ip6po_dest1 = NULL; 2438 } 2439 if (optname == -1 || optname == IPV6_RTHDR) { 2440 if (pktopt->ip6po_rhinfo.ip6po_rhi_rthdr) 2441 free(pktopt->ip6po_rhinfo.ip6po_rhi_rthdr, M_IP6OPT); 2442 pktopt->ip6po_rhinfo.ip6po_rhi_rthdr = NULL; 2443 if (pktopt->ip6po_route.ro_rt) { 2444 RTFREE(pktopt->ip6po_route.ro_rt); 2445 pktopt->ip6po_route.ro_rt = NULL; 2446 } 2447 } 2448 if (optname == -1 || optname == IPV6_DSTOPTS) { 2449 if (pktopt->ip6po_dest2) 2450 free(pktopt->ip6po_dest2, M_IP6OPT); 2451 pktopt->ip6po_dest2 = NULL; 2452 } 2453 } 2454 2455 #define PKTOPT_EXTHDRCPY(type) \ 2456 do {\ 2457 if (src->type) {\ 2458 int hlen = (((struct ip6_ext *)src->type)->ip6e_len + 1) << 3;\ 2459 dst->type = malloc(hlen, M_IP6OPT, canwait);\ 2460 if (dst->type == NULL && canwait == M_NOWAIT)\ 2461 goto bad;\ 2462 bcopy(src->type, dst->type, hlen);\ 2463 }\ 2464 } while (/*CONSTCOND*/ 0) 2465 2466 static int 2467 copypktopts(struct ip6_pktopts *dst, struct ip6_pktopts *src, int canwait) 2468 { 2469 if (dst == NULL || src == NULL) { 2470 printf("ip6_clearpktopts: invalid argument\n"); 2471 return (EINVAL); 2472 } 2473 2474 dst->ip6po_hlim = src->ip6po_hlim; 2475 dst->ip6po_tclass = src->ip6po_tclass; 2476 dst->ip6po_flags = src->ip6po_flags; 2477 dst->ip6po_minmtu = src->ip6po_minmtu; 2478 dst->ip6po_prefer_tempaddr = src->ip6po_prefer_tempaddr; 2479 if (src->ip6po_pktinfo) { 2480 dst->ip6po_pktinfo = malloc(sizeof(*dst->ip6po_pktinfo), 2481 M_IP6OPT, canwait); 2482 if (dst->ip6po_pktinfo == NULL) 2483 goto bad; 2484 *dst->ip6po_pktinfo = *src->ip6po_pktinfo; 2485 } 2486 if (src->ip6po_nexthop) { 2487 dst->ip6po_nexthop = malloc(src->ip6po_nexthop->sa_len, 2488 M_IP6OPT, canwait); 2489 if (dst->ip6po_nexthop == NULL) 2490 goto bad; 2491 bcopy(src->ip6po_nexthop, dst->ip6po_nexthop, 2492 src->ip6po_nexthop->sa_len); 2493 } 2494 PKTOPT_EXTHDRCPY(ip6po_hbh); 2495 PKTOPT_EXTHDRCPY(ip6po_dest1); 2496 PKTOPT_EXTHDRCPY(ip6po_dest2); 2497 PKTOPT_EXTHDRCPY(ip6po_rthdr); /* not copy the cached route */ 2498 return (0); 2499 2500 bad: 2501 ip6_clearpktopts(dst, -1); 2502 return (ENOBUFS); 2503 } 2504 #undef PKTOPT_EXTHDRCPY 2505 2506 struct ip6_pktopts * 2507 ip6_copypktopts(struct ip6_pktopts *src, int canwait) 2508 { 2509 int error; 2510 struct ip6_pktopts *dst; 2511 2512 dst = malloc(sizeof(*dst), M_IP6OPT, canwait); 2513 if (dst == NULL) 2514 return (NULL); 2515 ip6_initpktopts(dst); 2516 2517 if ((error = copypktopts(dst, src, canwait)) != 0) { 2518 free(dst, M_IP6OPT); 2519 return (NULL); 2520 } 2521 2522 return (dst); 2523 } 2524 2525 void 2526 ip6_freepcbopts(struct ip6_pktopts *pktopt) 2527 { 2528 if (pktopt == NULL) 2529 return; 2530 2531 ip6_clearpktopts(pktopt, -1); 2532 2533 free(pktopt, M_IP6OPT); 2534 } 2535 2536 /* 2537 * Set IPv6 outgoing packet options based on advanced API. 2538 */ 2539 int 2540 ip6_setpktopts(struct mbuf *control, struct ip6_pktopts *opt, 2541 struct ip6_pktopts *stickyopt, struct ucred *cred, int uproto) 2542 { 2543 struct cmsghdr *cm = 0; 2544 2545 if (control == NULL || opt == NULL) 2546 return (EINVAL); 2547 2548 ip6_initpktopts(opt); 2549 if (stickyopt) { 2550 int error; 2551 2552 /* 2553 * If stickyopt is provided, make a local copy of the options 2554 * for this particular packet, then override them by ancillary 2555 * objects. 2556 * XXX: copypktopts() does not copy the cached route to a next 2557 * hop (if any). This is not very good in terms of efficiency, 2558 * but we can allow this since this option should be rarely 2559 * used. 2560 */ 2561 if ((error = copypktopts(opt, stickyopt, M_NOWAIT)) != 0) 2562 return (error); 2563 } 2564 2565 /* 2566 * XXX: Currently, we assume all the optional information is stored 2567 * in a single mbuf. 2568 */ 2569 if (control->m_next) 2570 return (EINVAL); 2571 2572 for (; control->m_len > 0; control->m_data += CMSG_ALIGN(cm->cmsg_len), 2573 control->m_len -= CMSG_ALIGN(cm->cmsg_len)) { 2574 int error; 2575 2576 if (control->m_len < CMSG_LEN(0)) 2577 return (EINVAL); 2578 2579 cm = mtod(control, struct cmsghdr *); 2580 if (cm->cmsg_len == 0 || cm->cmsg_len > control->m_len) 2581 return (EINVAL); 2582 if (cm->cmsg_level != IPPROTO_IPV6) 2583 continue; 2584 2585 error = ip6_setpktopt(cm->cmsg_type, CMSG_DATA(cm), 2586 cm->cmsg_len - CMSG_LEN(0), opt, cred, 0, 1, uproto); 2587 if (error) 2588 return (error); 2589 } 2590 2591 return (0); 2592 } 2593 2594 /* 2595 * Set a particular packet option, as a sticky option or an ancillary data 2596 * item. "len" can be 0 only when it's a sticky option. 2597 * We have 4 cases of combination of "sticky" and "cmsg": 2598 * "sticky=0, cmsg=0": impossible 2599 * "sticky=0, cmsg=1": RFC2292 or RFC3542 ancillary data 2600 * "sticky=1, cmsg=0": RFC3542 socket option 2601 * "sticky=1, cmsg=1": RFC2292 socket option 2602 */ 2603 static int 2604 ip6_setpktopt(int optname, u_char *buf, int len, struct ip6_pktopts *opt, 2605 struct ucred *cred, int sticky, int cmsg, int uproto) 2606 { 2607 int minmtupolicy, preftemp; 2608 int error; 2609 2610 if (!sticky && !cmsg) { 2611 #ifdef DIAGNOSTIC 2612 printf("ip6_setpktopt: impossible case\n"); 2613 #endif 2614 return (EINVAL); 2615 } 2616 2617 /* 2618 * IPV6_2292xxx is for backward compatibility to RFC2292, and should 2619 * not be specified in the context of RFC3542. Conversely, 2620 * RFC3542 types should not be specified in the context of RFC2292. 2621 */ 2622 if (!cmsg) { 2623 switch (optname) { 2624 case IPV6_2292PKTINFO: 2625 case IPV6_2292HOPLIMIT: 2626 case IPV6_2292NEXTHOP: 2627 case IPV6_2292HOPOPTS: 2628 case IPV6_2292DSTOPTS: 2629 case IPV6_2292RTHDR: 2630 case IPV6_2292PKTOPTIONS: 2631 return (ENOPROTOOPT); 2632 } 2633 } 2634 if (sticky && cmsg) { 2635 switch (optname) { 2636 case IPV6_PKTINFO: 2637 case IPV6_HOPLIMIT: 2638 case IPV6_NEXTHOP: 2639 case IPV6_HOPOPTS: 2640 case IPV6_DSTOPTS: 2641 case IPV6_RTHDRDSTOPTS: 2642 case IPV6_RTHDR: 2643 case IPV6_USE_MIN_MTU: 2644 case IPV6_DONTFRAG: 2645 case IPV6_TCLASS: 2646 case IPV6_PREFER_TEMPADDR: /* XXX: not an RFC3542 option */ 2647 return (ENOPROTOOPT); 2648 } 2649 } 2650 2651 switch (optname) { 2652 case IPV6_2292PKTINFO: 2653 case IPV6_PKTINFO: 2654 { 2655 struct ifnet *ifp = NULL; 2656 struct in6_pktinfo *pktinfo; 2657 2658 if (len != sizeof(struct in6_pktinfo)) 2659 return (EINVAL); 2660 2661 pktinfo = (struct in6_pktinfo *)buf; 2662 2663 /* 2664 * An application can clear any sticky IPV6_PKTINFO option by 2665 * doing a "regular" setsockopt with ipi6_addr being 2666 * in6addr_any and ipi6_ifindex being zero. 2667 * [RFC 3542, Section 6] 2668 */ 2669 if (optname == IPV6_PKTINFO && opt->ip6po_pktinfo && 2670 pktinfo->ipi6_ifindex == 0 && 2671 IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) { 2672 ip6_clearpktopts(opt, optname); 2673 break; 2674 } 2675 2676 if (uproto == IPPROTO_TCP && optname == IPV6_PKTINFO && 2677 sticky && !IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) { 2678 return (EINVAL); 2679 } 2680 2681 /* validate the interface index if specified. */ 2682 if (pktinfo->ipi6_ifindex > V_if_index || 2683 pktinfo->ipi6_ifindex < 0) { 2684 return (ENXIO); 2685 } 2686 if (pktinfo->ipi6_ifindex) { 2687 ifp = ifnet_byindex(pktinfo->ipi6_ifindex); 2688 if (ifp == NULL) 2689 return (ENXIO); 2690 } 2691 2692 /* 2693 * We store the address anyway, and let in6_selectsrc() 2694 * validate the specified address. This is because ipi6_addr 2695 * may not have enough information about its scope zone, and 2696 * we may need additional information (such as outgoing 2697 * interface or the scope zone of a destination address) to 2698 * disambiguate the scope. 2699 * XXX: the delay of the validation may confuse the 2700 * application when it is used as a sticky option. 2701 */ 2702 if (opt->ip6po_pktinfo == NULL) { 2703 opt->ip6po_pktinfo = malloc(sizeof(*pktinfo), 2704 M_IP6OPT, M_NOWAIT); 2705 if (opt->ip6po_pktinfo == NULL) 2706 return (ENOBUFS); 2707 } 2708 bcopy(pktinfo, opt->ip6po_pktinfo, sizeof(*pktinfo)); 2709 break; 2710 } 2711 2712 case IPV6_2292HOPLIMIT: 2713 case IPV6_HOPLIMIT: 2714 { 2715 int *hlimp; 2716 2717 /* 2718 * RFC 3542 deprecated the usage of sticky IPV6_HOPLIMIT 2719 * to simplify the ordering among hoplimit options. 2720 */ 2721 if (optname == IPV6_HOPLIMIT && sticky) 2722 return (ENOPROTOOPT); 2723 2724 if (len != sizeof(int)) 2725 return (EINVAL); 2726 hlimp = (int *)buf; 2727 if (*hlimp < -1 || *hlimp > 255) 2728 return (EINVAL); 2729 2730 opt->ip6po_hlim = *hlimp; 2731 break; 2732 } 2733 2734 case IPV6_TCLASS: 2735 { 2736 int tclass; 2737 2738 if (len != sizeof(int)) 2739 return (EINVAL); 2740 tclass = *(int *)buf; 2741 if (tclass < -1 || tclass > 255) 2742 return (EINVAL); 2743 2744 opt->ip6po_tclass = tclass; 2745 break; 2746 } 2747 2748 case IPV6_2292NEXTHOP: 2749 case IPV6_NEXTHOP: 2750 if (cred != NULL) { 2751 error = priv_check_cred(cred, 2752 PRIV_NETINET_SETHDROPTS, 0); 2753 if (error) 2754 return (error); 2755 } 2756 2757 if (len == 0) { /* just remove the option */ 2758 ip6_clearpktopts(opt, IPV6_NEXTHOP); 2759 break; 2760 } 2761 2762 /* check if cmsg_len is large enough for sa_len */ 2763 if (len < sizeof(struct sockaddr) || len < *buf) 2764 return (EINVAL); 2765 2766 switch (((struct sockaddr *)buf)->sa_family) { 2767 case AF_INET6: 2768 { 2769 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)buf; 2770 int error; 2771 2772 if (sa6->sin6_len != sizeof(struct sockaddr_in6)) 2773 return (EINVAL); 2774 2775 if (IN6_IS_ADDR_UNSPECIFIED(&sa6->sin6_addr) || 2776 IN6_IS_ADDR_MULTICAST(&sa6->sin6_addr)) { 2777 return (EINVAL); 2778 } 2779 if ((error = sa6_embedscope(sa6, V_ip6_use_defzone)) 2780 != 0) { 2781 return (error); 2782 } 2783 break; 2784 } 2785 case AF_LINK: /* should eventually be supported */ 2786 default: 2787 return (EAFNOSUPPORT); 2788 } 2789 2790 /* turn off the previous option, then set the new option. */ 2791 ip6_clearpktopts(opt, IPV6_NEXTHOP); 2792 opt->ip6po_nexthop = malloc(*buf, M_IP6OPT, M_NOWAIT); 2793 if (opt->ip6po_nexthop == NULL) 2794 return (ENOBUFS); 2795 bcopy(buf, opt->ip6po_nexthop, *buf); 2796 break; 2797 2798 case IPV6_2292HOPOPTS: 2799 case IPV6_HOPOPTS: 2800 { 2801 struct ip6_hbh *hbh; 2802 int hbhlen; 2803 2804 /* 2805 * XXX: We don't allow a non-privileged user to set ANY HbH 2806 * options, since per-option restriction has too much 2807 * overhead. 2808 */ 2809 if (cred != NULL) { 2810 error = priv_check_cred(cred, 2811 PRIV_NETINET_SETHDROPTS, 0); 2812 if (error) 2813 return (error); 2814 } 2815 2816 if (len == 0) { 2817 ip6_clearpktopts(opt, IPV6_HOPOPTS); 2818 break; /* just remove the option */ 2819 } 2820 2821 /* message length validation */ 2822 if (len < sizeof(struct ip6_hbh)) 2823 return (EINVAL); 2824 hbh = (struct ip6_hbh *)buf; 2825 hbhlen = (hbh->ip6h_len + 1) << 3; 2826 if (len != hbhlen) 2827 return (EINVAL); 2828 2829 /* turn off the previous option, then set the new option. */ 2830 ip6_clearpktopts(opt, IPV6_HOPOPTS); 2831 opt->ip6po_hbh = malloc(hbhlen, M_IP6OPT, M_NOWAIT); 2832 if (opt->ip6po_hbh == NULL) 2833 return (ENOBUFS); 2834 bcopy(hbh, opt->ip6po_hbh, hbhlen); 2835 2836 break; 2837 } 2838 2839 case IPV6_2292DSTOPTS: 2840 case IPV6_DSTOPTS: 2841 case IPV6_RTHDRDSTOPTS: 2842 { 2843 struct ip6_dest *dest, **newdest = NULL; 2844 int destlen; 2845 2846 if (cred != NULL) { /* XXX: see the comment for IPV6_HOPOPTS */ 2847 error = priv_check_cred(cred, 2848 PRIV_NETINET_SETHDROPTS, 0); 2849 if (error) 2850 return (error); 2851 } 2852 2853 if (len == 0) { 2854 ip6_clearpktopts(opt, optname); 2855 break; /* just remove the option */ 2856 } 2857 2858 /* message length validation */ 2859 if (len < sizeof(struct ip6_dest)) 2860 return (EINVAL); 2861 dest = (struct ip6_dest *)buf; 2862 destlen = (dest->ip6d_len + 1) << 3; 2863 if (len != destlen) 2864 return (EINVAL); 2865 2866 /* 2867 * Determine the position that the destination options header 2868 * should be inserted; before or after the routing header. 2869 */ 2870 switch (optname) { 2871 case IPV6_2292DSTOPTS: 2872 /* 2873 * The old advacned API is ambiguous on this point. 2874 * Our approach is to determine the position based 2875 * according to the existence of a routing header. 2876 * Note, however, that this depends on the order of the 2877 * extension headers in the ancillary data; the 1st 2878 * part of the destination options header must appear 2879 * before the routing header in the ancillary data, 2880 * too. 2881 * RFC3542 solved the ambiguity by introducing 2882 * separate ancillary data or option types. 2883 */ 2884 if (opt->ip6po_rthdr == NULL) 2885 newdest = &opt->ip6po_dest1; 2886 else 2887 newdest = &opt->ip6po_dest2; 2888 break; 2889 case IPV6_RTHDRDSTOPTS: 2890 newdest = &opt->ip6po_dest1; 2891 break; 2892 case IPV6_DSTOPTS: 2893 newdest = &opt->ip6po_dest2; 2894 break; 2895 } 2896 2897 /* turn off the previous option, then set the new option. */ 2898 ip6_clearpktopts(opt, optname); 2899 *newdest = malloc(destlen, M_IP6OPT, M_NOWAIT); 2900 if (*newdest == NULL) 2901 return (ENOBUFS); 2902 bcopy(dest, *newdest, destlen); 2903 2904 break; 2905 } 2906 2907 case IPV6_2292RTHDR: 2908 case IPV6_RTHDR: 2909 { 2910 struct ip6_rthdr *rth; 2911 int rthlen; 2912 2913 if (len == 0) { 2914 ip6_clearpktopts(opt, IPV6_RTHDR); 2915 break; /* just remove the option */ 2916 } 2917 2918 /* message length validation */ 2919 if (len < sizeof(struct ip6_rthdr)) 2920 return (EINVAL); 2921 rth = (struct ip6_rthdr *)buf; 2922 rthlen = (rth->ip6r_len + 1) << 3; 2923 if (len != rthlen) 2924 return (EINVAL); 2925 2926 switch (rth->ip6r_type) { 2927 case IPV6_RTHDR_TYPE_0: 2928 if (rth->ip6r_len == 0) /* must contain one addr */ 2929 return (EINVAL); 2930 if (rth->ip6r_len % 2) /* length must be even */ 2931 return (EINVAL); 2932 if (rth->ip6r_len / 2 != rth->ip6r_segleft) 2933 return (EINVAL); 2934 break; 2935 default: 2936 return (EINVAL); /* not supported */ 2937 } 2938 2939 /* turn off the previous option */ 2940 ip6_clearpktopts(opt, IPV6_RTHDR); 2941 opt->ip6po_rthdr = malloc(rthlen, M_IP6OPT, M_NOWAIT); 2942 if (opt->ip6po_rthdr == NULL) 2943 return (ENOBUFS); 2944 bcopy(rth, opt->ip6po_rthdr, rthlen); 2945 2946 break; 2947 } 2948 2949 case IPV6_USE_MIN_MTU: 2950 if (len != sizeof(int)) 2951 return (EINVAL); 2952 minmtupolicy = *(int *)buf; 2953 if (minmtupolicy != IP6PO_MINMTU_MCASTONLY && 2954 minmtupolicy != IP6PO_MINMTU_DISABLE && 2955 minmtupolicy != IP6PO_MINMTU_ALL) { 2956 return (EINVAL); 2957 } 2958 opt->ip6po_minmtu = minmtupolicy; 2959 break; 2960 2961 case IPV6_DONTFRAG: 2962 if (len != sizeof(int)) 2963 return (EINVAL); 2964 2965 if (uproto == IPPROTO_TCP || *(int *)buf == 0) { 2966 /* 2967 * we ignore this option for TCP sockets. 2968 * (RFC3542 leaves this case unspecified.) 2969 */ 2970 opt->ip6po_flags &= ~IP6PO_DONTFRAG; 2971 } else 2972 opt->ip6po_flags |= IP6PO_DONTFRAG; 2973 break; 2974 2975 case IPV6_PREFER_TEMPADDR: 2976 if (len != sizeof(int)) 2977 return (EINVAL); 2978 preftemp = *(int *)buf; 2979 if (preftemp != IP6PO_TEMPADDR_SYSTEM && 2980 preftemp != IP6PO_TEMPADDR_NOTPREFER && 2981 preftemp != IP6PO_TEMPADDR_PREFER) { 2982 return (EINVAL); 2983 } 2984 opt->ip6po_prefer_tempaddr = preftemp; 2985 break; 2986 2987 default: 2988 return (ENOPROTOOPT); 2989 } /* end of switch */ 2990 2991 return (0); 2992 } 2993 2994 /* 2995 * Routine called from ip6_output() to loop back a copy of an IP6 multicast 2996 * packet to the input queue of a specified interface. Note that this 2997 * calls the output routine of the loopback "driver", but with an interface 2998 * pointer that might NOT be &loif -- easier than replicating that code here. 2999 */ 3000 void 3001 ip6_mloopback(struct ifnet *ifp, struct mbuf *m, struct sockaddr_in6 *dst) 3002 { 3003 struct mbuf *copym; 3004 struct ip6_hdr *ip6; 3005 3006 copym = m_copy(m, 0, M_COPYALL); 3007 if (copym == NULL) 3008 return; 3009 3010 /* 3011 * Make sure to deep-copy IPv6 header portion in case the data 3012 * is in an mbuf cluster, so that we can safely override the IPv6 3013 * header portion later. 3014 */ 3015 if ((copym->m_flags & M_EXT) != 0 || 3016 copym->m_len < sizeof(struct ip6_hdr)) { 3017 copym = m_pullup(copym, sizeof(struct ip6_hdr)); 3018 if (copym == NULL) 3019 return; 3020 } 3021 3022 #ifdef DIAGNOSTIC 3023 if (copym->m_len < sizeof(*ip6)) { 3024 m_freem(copym); 3025 return; 3026 } 3027 #endif 3028 3029 ip6 = mtod(copym, struct ip6_hdr *); 3030 /* 3031 * clear embedded scope identifiers if necessary. 3032 * in6_clearscope will touch the addresses only when necessary. 3033 */ 3034 in6_clearscope(&ip6->ip6_src); 3035 in6_clearscope(&ip6->ip6_dst); 3036 3037 (void)if_simloop(ifp, copym, dst->sin6_family, 0); 3038 } 3039 3040 /* 3041 * Chop IPv6 header off from the payload. 3042 */ 3043 static int 3044 ip6_splithdr(struct mbuf *m, struct ip6_exthdrs *exthdrs) 3045 { 3046 struct mbuf *mh; 3047 struct ip6_hdr *ip6; 3048 3049 ip6 = mtod(m, struct ip6_hdr *); 3050 if (m->m_len > sizeof(*ip6)) { 3051 MGETHDR(mh, M_DONTWAIT, MT_HEADER); 3052 if (mh == 0) { 3053 m_freem(m); 3054 return ENOBUFS; 3055 } 3056 M_MOVE_PKTHDR(mh, m); 3057 MH_ALIGN(mh, sizeof(*ip6)); 3058 m->m_len -= sizeof(*ip6); 3059 m->m_data += sizeof(*ip6); 3060 mh->m_next = m; 3061 m = mh; 3062 m->m_len = sizeof(*ip6); 3063 bcopy((caddr_t)ip6, mtod(m, caddr_t), sizeof(*ip6)); 3064 } 3065 exthdrs->ip6e_ip6 = m; 3066 return 0; 3067 } 3068 3069 /* 3070 * Compute IPv6 extension header length. 3071 */ 3072 int 3073 ip6_optlen(struct inpcb *in6p) 3074 { 3075 int len; 3076 3077 if (!in6p->in6p_outputopts) 3078 return 0; 3079 3080 len = 0; 3081 #define elen(x) \ 3082 (((struct ip6_ext *)(x)) ? (((struct ip6_ext *)(x))->ip6e_len + 1) << 3 : 0) 3083 3084 len += elen(in6p->in6p_outputopts->ip6po_hbh); 3085 if (in6p->in6p_outputopts->ip6po_rthdr) 3086 /* dest1 is valid with rthdr only */ 3087 len += elen(in6p->in6p_outputopts->ip6po_dest1); 3088 len += elen(in6p->in6p_outputopts->ip6po_rthdr); 3089 len += elen(in6p->in6p_outputopts->ip6po_dest2); 3090 return len; 3091 #undef elen 3092 }
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