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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/9.2/sys/netinet6/ip6_output.c 253281 2013-07-12 18:54:47Z trociny $"); 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(int, u_char *, int, struct ip6_pktopts **, 134 struct ucred *, int); 135 static int ip6_pcbopts(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(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(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(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 * 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 */ 227 int 228 ip6_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 = NULL; 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 IP6STAT_INC(ip6s_badscope); 502 goto bad; 503 } 504 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src)) { 505 error = EOPNOTSUPP; 506 IP6STAT_INC(ip6s_badscope); 507 goto bad; 508 } 509 510 IP6STAT_INC(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 538 again: 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 if (ro->ro_rt && fwd_tag == NULL) { 640 rt = ro->ro_rt; 641 ifp = ro->ro_rt->rt_ifp; 642 } else { 643 if (fwd_tag == NULL) { 644 bzero(&dst_sa, sizeof(dst_sa)); 645 dst_sa.sin6_family = AF_INET6; 646 dst_sa.sin6_len = sizeof(dst_sa); 647 dst_sa.sin6_addr = ip6->ip6_dst; 648 } 649 error = in6_selectroute_fib(&dst_sa, opt, im6o, ro, &ifp, 650 &rt, inp ? inp->inp_inc.inc_fibnum : M_GETFIB(m)); 651 if (error != 0) { 652 if (ifp != NULL) 653 in6_ifstat_inc(ifp, ifs6_out_discard); 654 goto bad; 655 } 656 } 657 if (rt == NULL) { 658 /* 659 * If in6_selectroute() does not return a route entry, 660 * dst may not have been updated. 661 */ 662 *dst = dst_sa; /* XXX */ 663 } 664 665 /* 666 * then rt (for unicast) and ifp must be non-NULL valid values. 667 */ 668 if ((flags & IPV6_FORWARDING) == 0) { 669 /* XXX: the FORWARDING flag can be set for mrouting. */ 670 in6_ifstat_inc(ifp, ifs6_out_request); 671 } 672 if (rt != NULL) { 673 ia = (struct in6_ifaddr *)(rt->rt_ifa); 674 rt->rt_use++; 675 } 676 677 678 /* 679 * The outgoing interface must be in the zone of source and 680 * destination addresses. 681 */ 682 origifp = ifp; 683 684 src0 = ip6->ip6_src; 685 if (in6_setscope(&src0, origifp, &zone)) 686 goto badscope; 687 bzero(&src_sa, sizeof(src_sa)); 688 src_sa.sin6_family = AF_INET6; 689 src_sa.sin6_len = sizeof(src_sa); 690 src_sa.sin6_addr = ip6->ip6_src; 691 if (sa6_recoverscope(&src_sa) || zone != src_sa.sin6_scope_id) 692 goto badscope; 693 694 dst0 = ip6->ip6_dst; 695 if (in6_setscope(&dst0, origifp, &zone)) 696 goto badscope; 697 /* re-initialize to be sure */ 698 bzero(&dst_sa, sizeof(dst_sa)); 699 dst_sa.sin6_family = AF_INET6; 700 dst_sa.sin6_len = sizeof(dst_sa); 701 dst_sa.sin6_addr = ip6->ip6_dst; 702 if (sa6_recoverscope(&dst_sa) || zone != dst_sa.sin6_scope_id) { 703 goto badscope; 704 } 705 706 /* We should use ia_ifp to support the case of 707 * sending packets to an address of our own. 708 */ 709 if (ia != NULL && ia->ia_ifp) 710 ifp = ia->ia_ifp; 711 712 /* scope check is done. */ 713 goto routefound; 714 715 badscope: 716 IP6STAT_INC(ip6s_badscope); 717 in6_ifstat_inc(origifp, ifs6_out_discard); 718 if (error == 0) 719 error = EHOSTUNREACH; /* XXX */ 720 goto bad; 721 722 routefound: 723 if (rt && !IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 724 if (opt && opt->ip6po_nextroute.ro_rt) { 725 /* 726 * The nexthop is explicitly specified by the 727 * application. We assume the next hop is an IPv6 728 * address. 729 */ 730 dst = (struct sockaddr_in6 *)opt->ip6po_nexthop; 731 } 732 else if ((rt->rt_flags & RTF_GATEWAY)) 733 dst = (struct sockaddr_in6 *)rt->rt_gateway; 734 } 735 736 if (!IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 737 m->m_flags &= ~(M_BCAST | M_MCAST); /* just in case */ 738 } else { 739 m->m_flags = (m->m_flags & ~M_BCAST) | M_MCAST; 740 in6_ifstat_inc(ifp, ifs6_out_mcast); 741 /* 742 * Confirm that the outgoing interface supports multicast. 743 */ 744 if (!(ifp->if_flags & IFF_MULTICAST)) { 745 IP6STAT_INC(ip6s_noroute); 746 in6_ifstat_inc(ifp, ifs6_out_discard); 747 error = ENETUNREACH; 748 goto bad; 749 } 750 if ((im6o == NULL && in6_mcast_loop) || 751 (im6o && im6o->im6o_multicast_loop)) { 752 /* 753 * Loop back multicast datagram if not expressly 754 * forbidden to do so, even if we have not joined 755 * the address; protocols will filter it later, 756 * thus deferring a hash lookup and lock acquisition 757 * at the expense of an m_copym(). 758 */ 759 ip6_mloopback(ifp, m, dst); 760 } else { 761 /* 762 * If we are acting as a multicast router, perform 763 * multicast forwarding as if the packet had just 764 * arrived on the interface to which we are about 765 * to send. The multicast forwarding function 766 * recursively calls this function, using the 767 * IPV6_FORWARDING flag to prevent infinite recursion. 768 * 769 * Multicasts that are looped back by ip6_mloopback(), 770 * above, will be forwarded by the ip6_input() routine, 771 * if necessary. 772 */ 773 if (V_ip6_mrouter && (flags & IPV6_FORWARDING) == 0) { 774 /* 775 * XXX: ip6_mforward expects that rcvif is NULL 776 * when it is called from the originating path. 777 * However, it is not always the case, since 778 * some versions of MGETHDR() does not 779 * initialize the field. 780 */ 781 m->m_pkthdr.rcvif = NULL; 782 if (ip6_mforward(ip6, ifp, m) != 0) { 783 m_freem(m); 784 goto done; 785 } 786 } 787 } 788 /* 789 * Multicasts with a hoplimit of zero may be looped back, 790 * above, but must not be transmitted on a network. 791 * Also, multicasts addressed to the loopback interface 792 * are not sent -- the above call to ip6_mloopback() will 793 * loop back a copy if this host actually belongs to the 794 * destination group on the loopback interface. 795 */ 796 if (ip6->ip6_hlim == 0 || (ifp->if_flags & IFF_LOOPBACK) || 797 IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst)) { 798 m_freem(m); 799 goto done; 800 } 801 } 802 803 /* 804 * Fill the outgoing inteface to tell the upper layer 805 * to increment per-interface statistics. 806 */ 807 if (ifpp) 808 *ifpp = ifp; 809 810 /* Determine path MTU. */ 811 if ((error = ip6_getpmtu(ro_pmtu, ro, ifp, &finaldst, &mtu, 812 &alwaysfrag, inp ? inp->inp_inc.inc_fibnum : M_GETFIB(m))) != 0) 813 goto bad; 814 815 /* 816 * The caller of this function may specify to use the minimum MTU 817 * in some cases. 818 * An advanced API option (IPV6_USE_MIN_MTU) can also override MTU 819 * setting. The logic is a bit complicated; by default, unicast 820 * packets will follow path MTU while multicast packets will be sent at 821 * the minimum MTU. If IP6PO_MINMTU_ALL is specified, all packets 822 * including unicast ones will be sent at the minimum MTU. Multicast 823 * packets will always be sent at the minimum MTU unless 824 * IP6PO_MINMTU_DISABLE is explicitly specified. 825 * See RFC 3542 for more details. 826 */ 827 if (mtu > IPV6_MMTU) { 828 if ((flags & IPV6_MINMTU)) 829 mtu = IPV6_MMTU; 830 else if (opt && opt->ip6po_minmtu == IP6PO_MINMTU_ALL) 831 mtu = IPV6_MMTU; 832 else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) && 833 (opt == NULL || 834 opt->ip6po_minmtu != IP6PO_MINMTU_DISABLE)) { 835 mtu = IPV6_MMTU; 836 } 837 } 838 839 /* 840 * clear embedded scope identifiers if necessary. 841 * in6_clearscope will touch the addresses only when necessary. 842 */ 843 in6_clearscope(&ip6->ip6_src); 844 in6_clearscope(&ip6->ip6_dst); 845 846 /* 847 * If the outgoing packet contains a hop-by-hop options header, 848 * it must be examined and processed even by the source node. 849 * (RFC 2460, section 4.) 850 */ 851 if (exthdrs.ip6e_hbh) { 852 struct ip6_hbh *hbh = mtod(exthdrs.ip6e_hbh, struct ip6_hbh *); 853 u_int32_t dummy; /* XXX unused */ 854 u_int32_t plen = 0; /* XXX: ip6_process will check the value */ 855 856 #ifdef DIAGNOSTIC 857 if ((hbh->ip6h_len + 1) << 3 > exthdrs.ip6e_hbh->m_len) 858 panic("ip6e_hbh is not contiguous"); 859 #endif 860 /* 861 * XXX: if we have to send an ICMPv6 error to the sender, 862 * we need the M_LOOP flag since icmp6_error() expects 863 * the IPv6 and the hop-by-hop options header are 864 * contiguous unless the flag is set. 865 */ 866 m->m_flags |= M_LOOP; 867 m->m_pkthdr.rcvif = ifp; 868 if (ip6_process_hopopts(m, (u_int8_t *)(hbh + 1), 869 ((hbh->ip6h_len + 1) << 3) - sizeof(struct ip6_hbh), 870 &dummy, &plen) < 0) { 871 /* m was already freed at this point */ 872 error = EINVAL;/* better error? */ 873 goto done; 874 } 875 m->m_flags &= ~M_LOOP; /* XXX */ 876 m->m_pkthdr.rcvif = NULL; 877 } 878 879 /* Jump over all PFIL processing if hooks are not active. */ 880 if (!PFIL_HOOKED(&V_inet6_pfil_hook)) 881 goto passout; 882 883 odst = ip6->ip6_dst; 884 /* Run through list of hooks for output packets. */ 885 error = pfil_run_hooks(&V_inet6_pfil_hook, &m, ifp, PFIL_OUT, inp); 886 if (error != 0 || m == NULL) 887 goto done; 888 ip6 = mtod(m, struct ip6_hdr *); 889 890 /* See if destination IP address was changed by packet filter. */ 891 if (!IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst)) { 892 m->m_flags |= M_SKIP_FIREWALL; 893 /* If destination is now ourself drop to ip6_input(). */ 894 if (in6_localip(&ip6->ip6_dst)) { 895 m->m_flags |= M_FASTFWD_OURS; 896 if (m->m_pkthdr.rcvif == NULL) 897 m->m_pkthdr.rcvif = V_loif; 898 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6) { 899 m->m_pkthdr.csum_flags |= 900 CSUM_DATA_VALID_IPV6 | CSUM_PSEUDO_HDR; 901 m->m_pkthdr.csum_data = 0xffff; 902 } 903 #ifdef SCTP 904 if (m->m_pkthdr.csum_flags & CSUM_SCTP_IPV6) 905 m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID; 906 #endif 907 error = netisr_queue(NETISR_IPV6, m); 908 goto done; 909 } else 910 goto again; /* Redo the routing table lookup. */ 911 } 912 913 /* See if local, if yes, send it to netisr. */ 914 if (m->m_flags & M_FASTFWD_OURS) { 915 if (m->m_pkthdr.rcvif == NULL) 916 m->m_pkthdr.rcvif = V_loif; 917 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6) { 918 m->m_pkthdr.csum_flags |= 919 CSUM_DATA_VALID_IPV6 | CSUM_PSEUDO_HDR; 920 m->m_pkthdr.csum_data = 0xffff; 921 } 922 #ifdef SCTP 923 if (m->m_pkthdr.csum_flags & CSUM_SCTP_IPV6) 924 m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID; 925 #endif 926 error = netisr_queue(NETISR_IPV6, m); 927 goto done; 928 } 929 /* Or forward to some other address? */ 930 if ((m->m_flags & M_IP6_NEXTHOP) && 931 (fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL)) != NULL) { 932 dst = (struct sockaddr_in6 *)&ro->ro_dst; 933 bcopy((fwd_tag+1), &dst_sa, sizeof(struct sockaddr_in6)); 934 m->m_flags |= M_SKIP_FIREWALL; 935 m->m_flags &= ~M_IP6_NEXTHOP; 936 m_tag_delete(m, fwd_tag); 937 goto again; 938 } 939 940 passout: 941 /* 942 * Send the packet to the outgoing interface. 943 * If necessary, do IPv6 fragmentation before sending. 944 * 945 * the logic here is rather complex: 946 * 1: normal case (dontfrag == 0, alwaysfrag == 0) 947 * 1-a: send as is if tlen <= path mtu 948 * 1-b: fragment if tlen > path mtu 949 * 950 * 2: if user asks us not to fragment (dontfrag == 1) 951 * 2-a: send as is if tlen <= interface mtu 952 * 2-b: error if tlen > interface mtu 953 * 954 * 3: if we always need to attach fragment header (alwaysfrag == 1) 955 * always fragment 956 * 957 * 4: if dontfrag == 1 && alwaysfrag == 1 958 * error, as we cannot handle this conflicting request 959 */ 960 sw_csum = m->m_pkthdr.csum_flags; 961 if (!hdrsplit) { 962 tso = ((sw_csum & ifp->if_hwassist & CSUM_TSO) != 0) ? 1 : 0; 963 sw_csum &= ~ifp->if_hwassist; 964 } else 965 tso = 0; 966 /* 967 * If we added extension headers, we will not do TSO and calculate the 968 * checksums ourselves for now. 969 * XXX-BZ Need a framework to know when the NIC can handle it, even 970 * with ext. hdrs. 971 */ 972 if (sw_csum & CSUM_DELAY_DATA_IPV6) { 973 sw_csum &= ~CSUM_DELAY_DATA_IPV6; 974 in6_delayed_cksum(m, plen, sizeof(struct ip6_hdr)); 975 } 976 #ifdef SCTP 977 if (sw_csum & CSUM_SCTP_IPV6) { 978 sw_csum &= ~CSUM_SCTP_IPV6; 979 sctp_delayed_cksum(m, sizeof(struct ip6_hdr)); 980 } 981 #endif 982 m->m_pkthdr.csum_flags &= ifp->if_hwassist; 983 tlen = m->m_pkthdr.len; 984 985 if ((opt && (opt->ip6po_flags & IP6PO_DONTFRAG)) || tso) 986 dontfrag = 1; 987 else 988 dontfrag = 0; 989 if (dontfrag && alwaysfrag) { /* case 4 */ 990 /* conflicting request - can't transmit */ 991 error = EMSGSIZE; 992 goto bad; 993 } 994 if (dontfrag && tlen > IN6_LINKMTU(ifp) && !tso) { /* case 2-b */ 995 /* 996 * Even if the DONTFRAG option is specified, we cannot send the 997 * packet when the data length is larger than the MTU of the 998 * outgoing interface. 999 * Notify the error by sending IPV6_PATHMTU ancillary data as 1000 * well as returning an error code (the latter is not described 1001 * in the API spec.) 1002 */ 1003 u_int32_t mtu32; 1004 struct ip6ctlparam ip6cp; 1005 1006 mtu32 = (u_int32_t)mtu; 1007 bzero(&ip6cp, sizeof(ip6cp)); 1008 ip6cp.ip6c_cmdarg = (void *)&mtu32; 1009 pfctlinput2(PRC_MSGSIZE, (struct sockaddr *)&ro_pmtu->ro_dst, 1010 (void *)&ip6cp); 1011 1012 error = EMSGSIZE; 1013 goto bad; 1014 } 1015 1016 /* 1017 * transmit packet without fragmentation 1018 */ 1019 if (dontfrag || (!alwaysfrag && tlen <= mtu)) { /* case 1-a and 2-a */ 1020 struct in6_ifaddr *ia6; 1021 1022 ip6 = mtod(m, struct ip6_hdr *); 1023 ia6 = in6_ifawithifp(ifp, &ip6->ip6_src); 1024 if (ia6) { 1025 /* Record statistics for this interface address. */ 1026 ia6->ia_ifa.if_opackets++; 1027 ia6->ia_ifa.if_obytes += m->m_pkthdr.len; 1028 ifa_free(&ia6->ia_ifa); 1029 } 1030 error = nd6_output(ifp, origifp, m, dst, ro->ro_rt); 1031 goto done; 1032 } 1033 1034 /* 1035 * try to fragment the packet. case 1-b and 3 1036 */ 1037 if (mtu < IPV6_MMTU) { 1038 /* path MTU cannot be less than IPV6_MMTU */ 1039 error = EMSGSIZE; 1040 in6_ifstat_inc(ifp, ifs6_out_fragfail); 1041 goto bad; 1042 } else if (ip6->ip6_plen == 0) { 1043 /* jumbo payload cannot be fragmented */ 1044 error = EMSGSIZE; 1045 in6_ifstat_inc(ifp, ifs6_out_fragfail); 1046 goto bad; 1047 } else { 1048 struct mbuf **mnext, *m_frgpart; 1049 struct ip6_frag *ip6f; 1050 u_int32_t id = htonl(ip6_randomid()); 1051 u_char nextproto; 1052 1053 int qslots = ifp->if_snd.ifq_maxlen - ifp->if_snd.ifq_len; 1054 1055 /* 1056 * Too large for the destination or interface; 1057 * fragment if possible. 1058 * Must be able to put at least 8 bytes per fragment. 1059 */ 1060 hlen = unfragpartlen; 1061 if (mtu > IPV6_MAXPACKET) 1062 mtu = IPV6_MAXPACKET; 1063 1064 len = (mtu - hlen - sizeof(struct ip6_frag)) & ~7; 1065 if (len < 8) { 1066 error = EMSGSIZE; 1067 in6_ifstat_inc(ifp, ifs6_out_fragfail); 1068 goto bad; 1069 } 1070 1071 /* 1072 * Verify that we have any chance at all of being able to queue 1073 * the packet or packet fragments 1074 */ 1075 if (qslots <= 0 || ((u_int)qslots * (mtu - hlen) 1076 < tlen /* - hlen */)) { 1077 error = ENOBUFS; 1078 IP6STAT_INC(ip6s_odropped); 1079 goto bad; 1080 } 1081 1082 1083 /* 1084 * If the interface will not calculate checksums on 1085 * fragmented packets, then do it here. 1086 * XXX-BZ handle the hw offloading case. Need flags. 1087 */ 1088 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6) { 1089 in6_delayed_cksum(m, plen, hlen); 1090 m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA_IPV6; 1091 } 1092 #ifdef SCTP 1093 if (m->m_pkthdr.csum_flags & CSUM_SCTP_IPV6) { 1094 sctp_delayed_cksum(m, hlen); 1095 m->m_pkthdr.csum_flags &= ~CSUM_SCTP_IPV6; 1096 } 1097 #endif 1098 mnext = &m->m_nextpkt; 1099 1100 /* 1101 * Change the next header field of the last header in the 1102 * unfragmentable part. 1103 */ 1104 if (exthdrs.ip6e_rthdr) { 1105 nextproto = *mtod(exthdrs.ip6e_rthdr, u_char *); 1106 *mtod(exthdrs.ip6e_rthdr, u_char *) = IPPROTO_FRAGMENT; 1107 } else if (exthdrs.ip6e_dest1) { 1108 nextproto = *mtod(exthdrs.ip6e_dest1, u_char *); 1109 *mtod(exthdrs.ip6e_dest1, u_char *) = IPPROTO_FRAGMENT; 1110 } else if (exthdrs.ip6e_hbh) { 1111 nextproto = *mtod(exthdrs.ip6e_hbh, u_char *); 1112 *mtod(exthdrs.ip6e_hbh, u_char *) = IPPROTO_FRAGMENT; 1113 } else { 1114 nextproto = ip6->ip6_nxt; 1115 ip6->ip6_nxt = IPPROTO_FRAGMENT; 1116 } 1117 1118 /* 1119 * Loop through length of segment after first fragment, 1120 * make new header and copy data of each part and link onto 1121 * chain. 1122 */ 1123 m0 = m; 1124 for (off = hlen; off < tlen; off += len) { 1125 MGETHDR(m, M_DONTWAIT, MT_HEADER); 1126 if (!m) { 1127 error = ENOBUFS; 1128 IP6STAT_INC(ip6s_odropped); 1129 goto sendorfree; 1130 } 1131 m->m_pkthdr.rcvif = NULL; 1132 m->m_flags = m0->m_flags & M_COPYFLAGS; /* incl. FIB */ 1133 *mnext = m; 1134 mnext = &m->m_nextpkt; 1135 m->m_data += max_linkhdr; 1136 mhip6 = mtod(m, struct ip6_hdr *); 1137 *mhip6 = *ip6; 1138 m->m_len = sizeof(*mhip6); 1139 error = ip6_insertfraghdr(m0, m, hlen, &ip6f); 1140 if (error) { 1141 IP6STAT_INC(ip6s_odropped); 1142 goto sendorfree; 1143 } 1144 ip6f->ip6f_offlg = htons((u_short)((off - hlen) & ~7)); 1145 if (off + len >= tlen) 1146 len = tlen - off; 1147 else 1148 ip6f->ip6f_offlg |= IP6F_MORE_FRAG; 1149 mhip6->ip6_plen = htons((u_short)(len + hlen + 1150 sizeof(*ip6f) - sizeof(struct ip6_hdr))); 1151 if ((m_frgpart = m_copy(m0, off, len)) == 0) { 1152 error = ENOBUFS; 1153 IP6STAT_INC(ip6s_odropped); 1154 goto sendorfree; 1155 } 1156 m_cat(m, m_frgpart); 1157 m->m_pkthdr.len = len + hlen + sizeof(*ip6f); 1158 m->m_pkthdr.rcvif = NULL; 1159 ip6f->ip6f_reserved = 0; 1160 ip6f->ip6f_ident = id; 1161 ip6f->ip6f_nxt = nextproto; 1162 IP6STAT_INC(ip6s_ofragments); 1163 in6_ifstat_inc(ifp, ifs6_out_fragcreat); 1164 } 1165 1166 in6_ifstat_inc(ifp, ifs6_out_fragok); 1167 } 1168 1169 /* 1170 * Remove leading garbages. 1171 */ 1172 sendorfree: 1173 m = m0->m_nextpkt; 1174 m0->m_nextpkt = 0; 1175 m_freem(m0); 1176 for (m0 = m; m; m = m0) { 1177 m0 = m->m_nextpkt; 1178 m->m_nextpkt = 0; 1179 if (error == 0) { 1180 /* Record statistics for this interface address. */ 1181 if (ia) { 1182 ia->ia_ifa.if_opackets++; 1183 ia->ia_ifa.if_obytes += m->m_pkthdr.len; 1184 } 1185 error = nd6_output(ifp, origifp, m, dst, ro->ro_rt); 1186 } else 1187 m_freem(m); 1188 } 1189 1190 if (error == 0) 1191 IP6STAT_INC(ip6s_fragmented); 1192 1193 done: 1194 if (ro == &ip6route) 1195 RO_RTFREE(ro); 1196 if (ro_pmtu == &ip6route) 1197 RO_RTFREE(ro_pmtu); 1198 #ifdef IPSEC 1199 if (sp != NULL) 1200 KEY_FREESP(&sp); 1201 #endif 1202 1203 return (error); 1204 1205 freehdrs: 1206 m_freem(exthdrs.ip6e_hbh); /* m_freem will check if mbuf is 0 */ 1207 m_freem(exthdrs.ip6e_dest1); 1208 m_freem(exthdrs.ip6e_rthdr); 1209 m_freem(exthdrs.ip6e_dest2); 1210 /* FALLTHROUGH */ 1211 bad: 1212 if (m) 1213 m_freem(m); 1214 goto done; 1215 } 1216 1217 static int 1218 ip6_copyexthdr(struct mbuf **mp, caddr_t hdr, int hlen) 1219 { 1220 struct mbuf *m; 1221 1222 if (hlen > MCLBYTES) 1223 return (ENOBUFS); /* XXX */ 1224 1225 MGET(m, M_DONTWAIT, MT_DATA); 1226 if (!m) 1227 return (ENOBUFS); 1228 1229 if (hlen > MLEN) { 1230 MCLGET(m, M_DONTWAIT); 1231 if ((m->m_flags & M_EXT) == 0) { 1232 m_free(m); 1233 return (ENOBUFS); 1234 } 1235 } 1236 m->m_len = hlen; 1237 if (hdr) 1238 bcopy(hdr, mtod(m, caddr_t), hlen); 1239 1240 *mp = m; 1241 return (0); 1242 } 1243 1244 /* 1245 * Insert jumbo payload option. 1246 */ 1247 static int 1248 ip6_insert_jumboopt(struct ip6_exthdrs *exthdrs, u_int32_t plen) 1249 { 1250 struct mbuf *mopt; 1251 u_char *optbuf; 1252 u_int32_t v; 1253 1254 #define JUMBOOPTLEN 8 /* length of jumbo payload option and padding */ 1255 1256 /* 1257 * If there is no hop-by-hop options header, allocate new one. 1258 * If there is one but it doesn't have enough space to store the 1259 * jumbo payload option, allocate a cluster to store the whole options. 1260 * Otherwise, use it to store the options. 1261 */ 1262 if (exthdrs->ip6e_hbh == 0) { 1263 MGET(mopt, M_DONTWAIT, MT_DATA); 1264 if (mopt == 0) 1265 return (ENOBUFS); 1266 mopt->m_len = JUMBOOPTLEN; 1267 optbuf = mtod(mopt, u_char *); 1268 optbuf[1] = 0; /* = ((JUMBOOPTLEN) >> 3) - 1 */ 1269 exthdrs->ip6e_hbh = mopt; 1270 } else { 1271 struct ip6_hbh *hbh; 1272 1273 mopt = exthdrs->ip6e_hbh; 1274 if (M_TRAILINGSPACE(mopt) < JUMBOOPTLEN) { 1275 /* 1276 * XXX assumption: 1277 * - exthdrs->ip6e_hbh is not referenced from places 1278 * other than exthdrs. 1279 * - exthdrs->ip6e_hbh is not an mbuf chain. 1280 */ 1281 int oldoptlen = mopt->m_len; 1282 struct mbuf *n; 1283 1284 /* 1285 * XXX: give up if the whole (new) hbh header does 1286 * not fit even in an mbuf cluster. 1287 */ 1288 if (oldoptlen + JUMBOOPTLEN > MCLBYTES) 1289 return (ENOBUFS); 1290 1291 /* 1292 * As a consequence, we must always prepare a cluster 1293 * at this point. 1294 */ 1295 MGET(n, M_DONTWAIT, MT_DATA); 1296 if (n) { 1297 MCLGET(n, M_DONTWAIT); 1298 if ((n->m_flags & M_EXT) == 0) { 1299 m_freem(n); 1300 n = NULL; 1301 } 1302 } 1303 if (!n) 1304 return (ENOBUFS); 1305 n->m_len = oldoptlen + JUMBOOPTLEN; 1306 bcopy(mtod(mopt, caddr_t), mtod(n, caddr_t), 1307 oldoptlen); 1308 optbuf = mtod(n, caddr_t) + oldoptlen; 1309 m_freem(mopt); 1310 mopt = exthdrs->ip6e_hbh = n; 1311 } else { 1312 optbuf = mtod(mopt, u_char *) + mopt->m_len; 1313 mopt->m_len += JUMBOOPTLEN; 1314 } 1315 optbuf[0] = IP6OPT_PADN; 1316 optbuf[1] = 1; 1317 1318 /* 1319 * Adjust the header length according to the pad and 1320 * the jumbo payload option. 1321 */ 1322 hbh = mtod(mopt, struct ip6_hbh *); 1323 hbh->ip6h_len += (JUMBOOPTLEN >> 3); 1324 } 1325 1326 /* fill in the option. */ 1327 optbuf[2] = IP6OPT_JUMBO; 1328 optbuf[3] = 4; 1329 v = (u_int32_t)htonl(plen + JUMBOOPTLEN); 1330 bcopy(&v, &optbuf[4], sizeof(u_int32_t)); 1331 1332 /* finally, adjust the packet header length */ 1333 exthdrs->ip6e_ip6->m_pkthdr.len += JUMBOOPTLEN; 1334 1335 return (0); 1336 #undef JUMBOOPTLEN 1337 } 1338 1339 /* 1340 * Insert fragment header and copy unfragmentable header portions. 1341 */ 1342 static int 1343 ip6_insertfraghdr(struct mbuf *m0, struct mbuf *m, int hlen, 1344 struct ip6_frag **frghdrp) 1345 { 1346 struct mbuf *n, *mlast; 1347 1348 if (hlen > sizeof(struct ip6_hdr)) { 1349 n = m_copym(m0, sizeof(struct ip6_hdr), 1350 hlen - sizeof(struct ip6_hdr), M_DONTWAIT); 1351 if (n == 0) 1352 return (ENOBUFS); 1353 m->m_next = n; 1354 } else 1355 n = m; 1356 1357 /* Search for the last mbuf of unfragmentable part. */ 1358 for (mlast = n; mlast->m_next; mlast = mlast->m_next) 1359 ; 1360 1361 if ((mlast->m_flags & M_EXT) == 0 && 1362 M_TRAILINGSPACE(mlast) >= sizeof(struct ip6_frag)) { 1363 /* use the trailing space of the last mbuf for the fragment hdr */ 1364 *frghdrp = (struct ip6_frag *)(mtod(mlast, caddr_t) + 1365 mlast->m_len); 1366 mlast->m_len += sizeof(struct ip6_frag); 1367 m->m_pkthdr.len += sizeof(struct ip6_frag); 1368 } else { 1369 /* allocate a new mbuf for the fragment header */ 1370 struct mbuf *mfrg; 1371 1372 MGET(mfrg, M_DONTWAIT, MT_DATA); 1373 if (mfrg == 0) 1374 return (ENOBUFS); 1375 mfrg->m_len = sizeof(struct ip6_frag); 1376 *frghdrp = mtod(mfrg, struct ip6_frag *); 1377 mlast->m_next = mfrg; 1378 } 1379 1380 return (0); 1381 } 1382 1383 static int 1384 ip6_getpmtu(struct route_in6 *ro_pmtu, struct route_in6 *ro, 1385 struct ifnet *ifp, struct in6_addr *dst, u_long *mtup, 1386 int *alwaysfragp, u_int fibnum) 1387 { 1388 u_int32_t mtu = 0; 1389 int alwaysfrag = 0; 1390 int error = 0; 1391 1392 if (ro_pmtu != ro) { 1393 /* The first hop and the final destination may differ. */ 1394 struct sockaddr_in6 *sa6_dst = 1395 (struct sockaddr_in6 *)&ro_pmtu->ro_dst; 1396 if (ro_pmtu->ro_rt && 1397 ((ro_pmtu->ro_rt->rt_flags & RTF_UP) == 0 || 1398 !IN6_ARE_ADDR_EQUAL(&sa6_dst->sin6_addr, dst))) { 1399 RTFREE(ro_pmtu->ro_rt); 1400 ro_pmtu->ro_rt = (struct rtentry *)NULL; 1401 } 1402 if (ro_pmtu->ro_rt == NULL) { 1403 bzero(sa6_dst, sizeof(*sa6_dst)); 1404 sa6_dst->sin6_family = AF_INET6; 1405 sa6_dst->sin6_len = sizeof(struct sockaddr_in6); 1406 sa6_dst->sin6_addr = *dst; 1407 1408 in6_rtalloc(ro_pmtu, fibnum); 1409 } 1410 } 1411 if (ro_pmtu->ro_rt) { 1412 u_int32_t ifmtu; 1413 struct in_conninfo inc; 1414 1415 bzero(&inc, sizeof(inc)); 1416 inc.inc_flags |= INC_ISIPV6; 1417 inc.inc6_faddr = *dst; 1418 1419 if (ifp == NULL) 1420 ifp = ro_pmtu->ro_rt->rt_ifp; 1421 ifmtu = IN6_LINKMTU(ifp); 1422 mtu = tcp_hc_getmtu(&inc); 1423 if (mtu) 1424 mtu = min(mtu, ro_pmtu->ro_rt->rt_rmx.rmx_mtu); 1425 else 1426 mtu = ro_pmtu->ro_rt->rt_rmx.rmx_mtu; 1427 if (mtu == 0) 1428 mtu = ifmtu; 1429 else if (mtu < IPV6_MMTU) { 1430 /* 1431 * RFC2460 section 5, last paragraph: 1432 * if we record ICMPv6 too big message with 1433 * mtu < IPV6_MMTU, transmit packets sized IPV6_MMTU 1434 * or smaller, with framgent header attached. 1435 * (fragment header is needed regardless from the 1436 * packet size, for translators to identify packets) 1437 */ 1438 alwaysfrag = 1; 1439 mtu = IPV6_MMTU; 1440 } else if (mtu > ifmtu) { 1441 /* 1442 * The MTU on the route is larger than the MTU on 1443 * the interface! This shouldn't happen, unless the 1444 * MTU of the interface has been changed after the 1445 * interface was brought up. Change the MTU in the 1446 * route to match the interface MTU (as long as the 1447 * field isn't locked). 1448 */ 1449 mtu = ifmtu; 1450 ro_pmtu->ro_rt->rt_rmx.rmx_mtu = mtu; 1451 } 1452 } else if (ifp) { 1453 mtu = IN6_LINKMTU(ifp); 1454 } else 1455 error = EHOSTUNREACH; /* XXX */ 1456 1457 *mtup = mtu; 1458 if (alwaysfragp) 1459 *alwaysfragp = alwaysfrag; 1460 return (error); 1461 } 1462 1463 /* 1464 * IP6 socket option processing. 1465 */ 1466 int 1467 ip6_ctloutput(struct socket *so, struct sockopt *sopt) 1468 { 1469 int optdatalen, uproto; 1470 void *optdata; 1471 struct inpcb *in6p = sotoinpcb(so); 1472 int error, optval; 1473 int level, op, optname; 1474 int optlen; 1475 struct thread *td; 1476 1477 level = sopt->sopt_level; 1478 op = sopt->sopt_dir; 1479 optname = sopt->sopt_name; 1480 optlen = sopt->sopt_valsize; 1481 td = sopt->sopt_td; 1482 error = 0; 1483 optval = 0; 1484 uproto = (int)so->so_proto->pr_protocol; 1485 1486 if (level != IPPROTO_IPV6) { 1487 error = EINVAL; 1488 1489 if (sopt->sopt_level == SOL_SOCKET && 1490 sopt->sopt_dir == SOPT_SET) { 1491 switch (sopt->sopt_name) { 1492 case SO_REUSEADDR: 1493 INP_WLOCK(in6p); 1494 if ((so->so_options & SO_REUSEADDR) != 0) 1495 in6p->inp_flags2 |= INP_REUSEADDR; 1496 else 1497 in6p->inp_flags2 &= ~INP_REUSEADDR; 1498 INP_WUNLOCK(in6p); 1499 error = 0; 1500 break; 1501 case SO_REUSEPORT: 1502 INP_WLOCK(in6p); 1503 if ((so->so_options & SO_REUSEPORT) != 0) 1504 in6p->inp_flags2 |= INP_REUSEPORT; 1505 else 1506 in6p->inp_flags2 &= ~INP_REUSEPORT; 1507 INP_WUNLOCK(in6p); 1508 error = 0; 1509 break; 1510 case SO_SETFIB: 1511 INP_WLOCK(in6p); 1512 in6p->inp_inc.inc_fibnum = so->so_fibnum; 1513 INP_WUNLOCK(in6p); 1514 error = 0; 1515 break; 1516 default: 1517 break; 1518 } 1519 } 1520 } else { /* level == IPPROTO_IPV6 */ 1521 switch (op) { 1522 1523 case SOPT_SET: 1524 switch (optname) { 1525 case IPV6_2292PKTOPTIONS: 1526 #ifdef IPV6_PKTOPTIONS 1527 case IPV6_PKTOPTIONS: 1528 #endif 1529 { 1530 struct mbuf *m; 1531 1532 error = soopt_getm(sopt, &m); /* XXX */ 1533 if (error != 0) 1534 break; 1535 error = soopt_mcopyin(sopt, m); /* XXX */ 1536 if (error != 0) 1537 break; 1538 error = ip6_pcbopts(&in6p->in6p_outputopts, 1539 m, so, sopt); 1540 m_freem(m); /* XXX */ 1541 break; 1542 } 1543 1544 /* 1545 * Use of some Hop-by-Hop options or some 1546 * Destination options, might require special 1547 * privilege. That is, normal applications 1548 * (without special privilege) might be forbidden 1549 * from setting certain options in outgoing packets, 1550 * and might never see certain options in received 1551 * packets. [RFC 2292 Section 6] 1552 * KAME specific note: 1553 * KAME prevents non-privileged users from sending or 1554 * receiving ANY hbh/dst options in order to avoid 1555 * overhead of parsing options in the kernel. 1556 */ 1557 case IPV6_RECVHOPOPTS: 1558 case IPV6_RECVDSTOPTS: 1559 case IPV6_RECVRTHDRDSTOPTS: 1560 if (td != NULL) { 1561 error = priv_check(td, 1562 PRIV_NETINET_SETHDROPTS); 1563 if (error) 1564 break; 1565 } 1566 /* FALLTHROUGH */ 1567 case IPV6_UNICAST_HOPS: 1568 case IPV6_HOPLIMIT: 1569 case IPV6_FAITH: 1570 1571 case IPV6_RECVPKTINFO: 1572 case IPV6_RECVHOPLIMIT: 1573 case IPV6_RECVRTHDR: 1574 case IPV6_RECVPATHMTU: 1575 case IPV6_RECVTCLASS: 1576 case IPV6_V6ONLY: 1577 case IPV6_AUTOFLOWLABEL: 1578 case IPV6_BINDANY: 1579 if (optname == IPV6_BINDANY && td != NULL) { 1580 error = priv_check(td, 1581 PRIV_NETINET_BINDANY); 1582 if (error) 1583 break; 1584 } 1585 1586 if (optlen != sizeof(int)) { 1587 error = EINVAL; 1588 break; 1589 } 1590 error = sooptcopyin(sopt, &optval, 1591 sizeof optval, sizeof optval); 1592 if (error) 1593 break; 1594 switch (optname) { 1595 1596 case IPV6_UNICAST_HOPS: 1597 if (optval < -1 || optval >= 256) 1598 error = EINVAL; 1599 else { 1600 /* -1 = kernel default */ 1601 in6p->in6p_hops = optval; 1602 if ((in6p->inp_vflag & 1603 INP_IPV4) != 0) 1604 in6p->inp_ip_ttl = optval; 1605 } 1606 break; 1607 #define OPTSET(bit) \ 1608 do { \ 1609 INP_WLOCK(in6p); \ 1610 if (optval) \ 1611 in6p->inp_flags |= (bit); \ 1612 else \ 1613 in6p->inp_flags &= ~(bit); \ 1614 INP_WUNLOCK(in6p); \ 1615 } while (/*CONSTCOND*/ 0) 1616 #define OPTSET2292(bit) \ 1617 do { \ 1618 INP_WLOCK(in6p); \ 1619 in6p->inp_flags |= IN6P_RFC2292; \ 1620 if (optval) \ 1621 in6p->inp_flags |= (bit); \ 1622 else \ 1623 in6p->inp_flags &= ~(bit); \ 1624 INP_WUNLOCK(in6p); \ 1625 } while (/*CONSTCOND*/ 0) 1626 #define OPTBIT(bit) (in6p->inp_flags & (bit) ? 1 : 0) 1627 1628 case IPV6_RECVPKTINFO: 1629 /* cannot mix with RFC2292 */ 1630 if (OPTBIT(IN6P_RFC2292)) { 1631 error = EINVAL; 1632 break; 1633 } 1634 OPTSET(IN6P_PKTINFO); 1635 break; 1636 1637 case IPV6_HOPLIMIT: 1638 { 1639 struct ip6_pktopts **optp; 1640 1641 /* cannot mix with RFC2292 */ 1642 if (OPTBIT(IN6P_RFC2292)) { 1643 error = EINVAL; 1644 break; 1645 } 1646 optp = &in6p->in6p_outputopts; 1647 error = ip6_pcbopt(IPV6_HOPLIMIT, 1648 (u_char *)&optval, sizeof(optval), 1649 optp, (td != NULL) ? td->td_ucred : 1650 NULL, uproto); 1651 break; 1652 } 1653 1654 case IPV6_RECVHOPLIMIT: 1655 /* cannot mix with RFC2292 */ 1656 if (OPTBIT(IN6P_RFC2292)) { 1657 error = EINVAL; 1658 break; 1659 } 1660 OPTSET(IN6P_HOPLIMIT); 1661 break; 1662 1663 case IPV6_RECVHOPOPTS: 1664 /* cannot mix with RFC2292 */ 1665 if (OPTBIT(IN6P_RFC2292)) { 1666 error = EINVAL; 1667 break; 1668 } 1669 OPTSET(IN6P_HOPOPTS); 1670 break; 1671 1672 case IPV6_RECVDSTOPTS: 1673 /* cannot mix with RFC2292 */ 1674 if (OPTBIT(IN6P_RFC2292)) { 1675 error = EINVAL; 1676 break; 1677 } 1678 OPTSET(IN6P_DSTOPTS); 1679 break; 1680 1681 case IPV6_RECVRTHDRDSTOPTS: 1682 /* cannot mix with RFC2292 */ 1683 if (OPTBIT(IN6P_RFC2292)) { 1684 error = EINVAL; 1685 break; 1686 } 1687 OPTSET(IN6P_RTHDRDSTOPTS); 1688 break; 1689 1690 case IPV6_RECVRTHDR: 1691 /* cannot mix with RFC2292 */ 1692 if (OPTBIT(IN6P_RFC2292)) { 1693 error = EINVAL; 1694 break; 1695 } 1696 OPTSET(IN6P_RTHDR); 1697 break; 1698 1699 case IPV6_FAITH: 1700 OPTSET(INP_FAITH); 1701 break; 1702 1703 case IPV6_RECVPATHMTU: 1704 /* 1705 * We ignore this option for TCP 1706 * sockets. 1707 * (RFC3542 leaves this case 1708 * unspecified.) 1709 */ 1710 if (uproto != IPPROTO_TCP) 1711 OPTSET(IN6P_MTU); 1712 break; 1713 1714 case IPV6_V6ONLY: 1715 /* 1716 * make setsockopt(IPV6_V6ONLY) 1717 * available only prior to bind(2). 1718 * see ipng mailing list, Jun 22 2001. 1719 */ 1720 if (in6p->inp_lport || 1721 !IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) { 1722 error = EINVAL; 1723 break; 1724 } 1725 OPTSET(IN6P_IPV6_V6ONLY); 1726 if (optval) 1727 in6p->inp_vflag &= ~INP_IPV4; 1728 else 1729 in6p->inp_vflag |= INP_IPV4; 1730 break; 1731 case IPV6_RECVTCLASS: 1732 /* cannot mix with RFC2292 XXX */ 1733 if (OPTBIT(IN6P_RFC2292)) { 1734 error = EINVAL; 1735 break; 1736 } 1737 OPTSET(IN6P_TCLASS); 1738 break; 1739 case IPV6_AUTOFLOWLABEL: 1740 OPTSET(IN6P_AUTOFLOWLABEL); 1741 break; 1742 1743 case IPV6_BINDANY: 1744 OPTSET(INP_BINDANY); 1745 break; 1746 } 1747 break; 1748 1749 case IPV6_TCLASS: 1750 case IPV6_DONTFRAG: 1751 case IPV6_USE_MIN_MTU: 1752 case IPV6_PREFER_TEMPADDR: 1753 if (optlen != sizeof(optval)) { 1754 error = EINVAL; 1755 break; 1756 } 1757 error = sooptcopyin(sopt, &optval, 1758 sizeof optval, sizeof optval); 1759 if (error) 1760 break; 1761 { 1762 struct ip6_pktopts **optp; 1763 optp = &in6p->in6p_outputopts; 1764 error = ip6_pcbopt(optname, 1765 (u_char *)&optval, sizeof(optval), 1766 optp, (td != NULL) ? td->td_ucred : 1767 NULL, uproto); 1768 break; 1769 } 1770 1771 case IPV6_2292PKTINFO: 1772 case IPV6_2292HOPLIMIT: 1773 case IPV6_2292HOPOPTS: 1774 case IPV6_2292DSTOPTS: 1775 case IPV6_2292RTHDR: 1776 /* RFC 2292 */ 1777 if (optlen != sizeof(int)) { 1778 error = EINVAL; 1779 break; 1780 } 1781 error = sooptcopyin(sopt, &optval, 1782 sizeof optval, sizeof optval); 1783 if (error) 1784 break; 1785 switch (optname) { 1786 case IPV6_2292PKTINFO: 1787 OPTSET2292(IN6P_PKTINFO); 1788 break; 1789 case IPV6_2292HOPLIMIT: 1790 OPTSET2292(IN6P_HOPLIMIT); 1791 break; 1792 case IPV6_2292HOPOPTS: 1793 /* 1794 * Check super-user privilege. 1795 * See comments for IPV6_RECVHOPOPTS. 1796 */ 1797 if (td != NULL) { 1798 error = priv_check(td, 1799 PRIV_NETINET_SETHDROPTS); 1800 if (error) 1801 return (error); 1802 } 1803 OPTSET2292(IN6P_HOPOPTS); 1804 break; 1805 case IPV6_2292DSTOPTS: 1806 if (td != NULL) { 1807 error = priv_check(td, 1808 PRIV_NETINET_SETHDROPTS); 1809 if (error) 1810 return (error); 1811 } 1812 OPTSET2292(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); /* XXX */ 1813 break; 1814 case IPV6_2292RTHDR: 1815 OPTSET2292(IN6P_RTHDR); 1816 break; 1817 } 1818 break; 1819 case IPV6_PKTINFO: 1820 case IPV6_HOPOPTS: 1821 case IPV6_RTHDR: 1822 case IPV6_DSTOPTS: 1823 case IPV6_RTHDRDSTOPTS: 1824 case IPV6_NEXTHOP: 1825 { 1826 /* new advanced API (RFC3542) */ 1827 u_char *optbuf; 1828 u_char optbuf_storage[MCLBYTES]; 1829 int optlen; 1830 struct ip6_pktopts **optp; 1831 1832 /* cannot mix with RFC2292 */ 1833 if (OPTBIT(IN6P_RFC2292)) { 1834 error = EINVAL; 1835 break; 1836 } 1837 1838 /* 1839 * We only ensure valsize is not too large 1840 * here. Further validation will be done 1841 * later. 1842 */ 1843 error = sooptcopyin(sopt, optbuf_storage, 1844 sizeof(optbuf_storage), 0); 1845 if (error) 1846 break; 1847 optlen = sopt->sopt_valsize; 1848 optbuf = optbuf_storage; 1849 optp = &in6p->in6p_outputopts; 1850 error = ip6_pcbopt(optname, optbuf, optlen, 1851 optp, (td != NULL) ? td->td_ucred : NULL, 1852 uproto); 1853 break; 1854 } 1855 #undef OPTSET 1856 1857 case IPV6_MULTICAST_IF: 1858 case IPV6_MULTICAST_HOPS: 1859 case IPV6_MULTICAST_LOOP: 1860 case IPV6_JOIN_GROUP: 1861 case IPV6_LEAVE_GROUP: 1862 case IPV6_MSFILTER: 1863 case MCAST_BLOCK_SOURCE: 1864 case MCAST_UNBLOCK_SOURCE: 1865 case MCAST_JOIN_GROUP: 1866 case MCAST_LEAVE_GROUP: 1867 case MCAST_JOIN_SOURCE_GROUP: 1868 case MCAST_LEAVE_SOURCE_GROUP: 1869 error = ip6_setmoptions(in6p, sopt); 1870 break; 1871 1872 case IPV6_PORTRANGE: 1873 error = sooptcopyin(sopt, &optval, 1874 sizeof optval, sizeof optval); 1875 if (error) 1876 break; 1877 1878 INP_WLOCK(in6p); 1879 switch (optval) { 1880 case IPV6_PORTRANGE_DEFAULT: 1881 in6p->inp_flags &= ~(INP_LOWPORT); 1882 in6p->inp_flags &= ~(INP_HIGHPORT); 1883 break; 1884 1885 case IPV6_PORTRANGE_HIGH: 1886 in6p->inp_flags &= ~(INP_LOWPORT); 1887 in6p->inp_flags |= INP_HIGHPORT; 1888 break; 1889 1890 case IPV6_PORTRANGE_LOW: 1891 in6p->inp_flags &= ~(INP_HIGHPORT); 1892 in6p->inp_flags |= INP_LOWPORT; 1893 break; 1894 1895 default: 1896 error = EINVAL; 1897 break; 1898 } 1899 INP_WUNLOCK(in6p); 1900 break; 1901 1902 #ifdef IPSEC 1903 case IPV6_IPSEC_POLICY: 1904 { 1905 caddr_t req; 1906 struct mbuf *m; 1907 1908 if ((error = soopt_getm(sopt, &m)) != 0) /* XXX */ 1909 break; 1910 if ((error = soopt_mcopyin(sopt, m)) != 0) /* XXX */ 1911 break; 1912 req = mtod(m, caddr_t); 1913 error = ipsec_set_policy(in6p, optname, req, 1914 m->m_len, (sopt->sopt_td != NULL) ? 1915 sopt->sopt_td->td_ucred : NULL); 1916 m_freem(m); 1917 break; 1918 } 1919 #endif /* IPSEC */ 1920 1921 default: 1922 error = ENOPROTOOPT; 1923 break; 1924 } 1925 break; 1926 1927 case SOPT_GET: 1928 switch (optname) { 1929 1930 case IPV6_2292PKTOPTIONS: 1931 #ifdef IPV6_PKTOPTIONS 1932 case IPV6_PKTOPTIONS: 1933 #endif 1934 /* 1935 * RFC3542 (effectively) deprecated the 1936 * semantics of the 2292-style pktoptions. 1937 * Since it was not reliable in nature (i.e., 1938 * applications had to expect the lack of some 1939 * information after all), it would make sense 1940 * to simplify this part by always returning 1941 * empty data. 1942 */ 1943 sopt->sopt_valsize = 0; 1944 break; 1945 1946 case IPV6_RECVHOPOPTS: 1947 case IPV6_RECVDSTOPTS: 1948 case IPV6_RECVRTHDRDSTOPTS: 1949 case IPV6_UNICAST_HOPS: 1950 case IPV6_RECVPKTINFO: 1951 case IPV6_RECVHOPLIMIT: 1952 case IPV6_RECVRTHDR: 1953 case IPV6_RECVPATHMTU: 1954 1955 case IPV6_FAITH: 1956 case IPV6_V6ONLY: 1957 case IPV6_PORTRANGE: 1958 case IPV6_RECVTCLASS: 1959 case IPV6_AUTOFLOWLABEL: 1960 case IPV6_BINDANY: 1961 switch (optname) { 1962 1963 case IPV6_RECVHOPOPTS: 1964 optval = OPTBIT(IN6P_HOPOPTS); 1965 break; 1966 1967 case IPV6_RECVDSTOPTS: 1968 optval = OPTBIT(IN6P_DSTOPTS); 1969 break; 1970 1971 case IPV6_RECVRTHDRDSTOPTS: 1972 optval = OPTBIT(IN6P_RTHDRDSTOPTS); 1973 break; 1974 1975 case IPV6_UNICAST_HOPS: 1976 optval = in6p->in6p_hops; 1977 break; 1978 1979 case IPV6_RECVPKTINFO: 1980 optval = OPTBIT(IN6P_PKTINFO); 1981 break; 1982 1983 case IPV6_RECVHOPLIMIT: 1984 optval = OPTBIT(IN6P_HOPLIMIT); 1985 break; 1986 1987 case IPV6_RECVRTHDR: 1988 optval = OPTBIT(IN6P_RTHDR); 1989 break; 1990 1991 case IPV6_RECVPATHMTU: 1992 optval = OPTBIT(IN6P_MTU); 1993 break; 1994 1995 case IPV6_FAITH: 1996 optval = OPTBIT(INP_FAITH); 1997 break; 1998 1999 case IPV6_V6ONLY: 2000 optval = OPTBIT(IN6P_IPV6_V6ONLY); 2001 break; 2002 2003 case IPV6_PORTRANGE: 2004 { 2005 int flags; 2006 flags = in6p->inp_flags; 2007 if (flags & INP_HIGHPORT) 2008 optval = IPV6_PORTRANGE_HIGH; 2009 else if (flags & INP_LOWPORT) 2010 optval = IPV6_PORTRANGE_LOW; 2011 else 2012 optval = 0; 2013 break; 2014 } 2015 case IPV6_RECVTCLASS: 2016 optval = OPTBIT(IN6P_TCLASS); 2017 break; 2018 2019 case IPV6_AUTOFLOWLABEL: 2020 optval = OPTBIT(IN6P_AUTOFLOWLABEL); 2021 break; 2022 2023 case IPV6_BINDANY: 2024 optval = OPTBIT(INP_BINDANY); 2025 break; 2026 } 2027 if (error) 2028 break; 2029 error = sooptcopyout(sopt, &optval, 2030 sizeof optval); 2031 break; 2032 2033 case IPV6_PATHMTU: 2034 { 2035 u_long pmtu = 0; 2036 struct ip6_mtuinfo mtuinfo; 2037 struct route_in6 sro; 2038 2039 bzero(&sro, sizeof(sro)); 2040 2041 if (!(so->so_state & SS_ISCONNECTED)) 2042 return (ENOTCONN); 2043 /* 2044 * XXX: we dot not consider the case of source 2045 * routing, or optional information to specify 2046 * the outgoing interface. 2047 */ 2048 error = ip6_getpmtu(&sro, NULL, NULL, 2049 &in6p->in6p_faddr, &pmtu, NULL, 2050 so->so_fibnum); 2051 if (sro.ro_rt) 2052 RTFREE(sro.ro_rt); 2053 if (error) 2054 break; 2055 if (pmtu > IPV6_MAXPACKET) 2056 pmtu = IPV6_MAXPACKET; 2057 2058 bzero(&mtuinfo, sizeof(mtuinfo)); 2059 mtuinfo.ip6m_mtu = (u_int32_t)pmtu; 2060 optdata = (void *)&mtuinfo; 2061 optdatalen = sizeof(mtuinfo); 2062 error = sooptcopyout(sopt, optdata, 2063 optdatalen); 2064 break; 2065 } 2066 2067 case IPV6_2292PKTINFO: 2068 case IPV6_2292HOPLIMIT: 2069 case IPV6_2292HOPOPTS: 2070 case IPV6_2292RTHDR: 2071 case IPV6_2292DSTOPTS: 2072 switch (optname) { 2073 case IPV6_2292PKTINFO: 2074 optval = OPTBIT(IN6P_PKTINFO); 2075 break; 2076 case IPV6_2292HOPLIMIT: 2077 optval = OPTBIT(IN6P_HOPLIMIT); 2078 break; 2079 case IPV6_2292HOPOPTS: 2080 optval = OPTBIT(IN6P_HOPOPTS); 2081 break; 2082 case IPV6_2292RTHDR: 2083 optval = OPTBIT(IN6P_RTHDR); 2084 break; 2085 case IPV6_2292DSTOPTS: 2086 optval = OPTBIT(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); 2087 break; 2088 } 2089 error = sooptcopyout(sopt, &optval, 2090 sizeof optval); 2091 break; 2092 case IPV6_PKTINFO: 2093 case IPV6_HOPOPTS: 2094 case IPV6_RTHDR: 2095 case IPV6_DSTOPTS: 2096 case IPV6_RTHDRDSTOPTS: 2097 case IPV6_NEXTHOP: 2098 case IPV6_TCLASS: 2099 case IPV6_DONTFRAG: 2100 case IPV6_USE_MIN_MTU: 2101 case IPV6_PREFER_TEMPADDR: 2102 error = ip6_getpcbopt(in6p->in6p_outputopts, 2103 optname, sopt); 2104 break; 2105 2106 case IPV6_MULTICAST_IF: 2107 case IPV6_MULTICAST_HOPS: 2108 case IPV6_MULTICAST_LOOP: 2109 case IPV6_MSFILTER: 2110 error = ip6_getmoptions(in6p, sopt); 2111 break; 2112 2113 #ifdef IPSEC 2114 case IPV6_IPSEC_POLICY: 2115 { 2116 caddr_t req = NULL; 2117 size_t len = 0; 2118 struct mbuf *m = NULL; 2119 struct mbuf **mp = &m; 2120 size_t ovalsize = sopt->sopt_valsize; 2121 caddr_t oval = (caddr_t)sopt->sopt_val; 2122 2123 error = soopt_getm(sopt, &m); /* XXX */ 2124 if (error != 0) 2125 break; 2126 error = soopt_mcopyin(sopt, m); /* XXX */ 2127 if (error != 0) 2128 break; 2129 sopt->sopt_valsize = ovalsize; 2130 sopt->sopt_val = oval; 2131 if (m) { 2132 req = mtod(m, caddr_t); 2133 len = m->m_len; 2134 } 2135 error = ipsec_get_policy(in6p, req, len, mp); 2136 if (error == 0) 2137 error = soopt_mcopyout(sopt, m); /* XXX */ 2138 if (error == 0 && m) 2139 m_freem(m); 2140 break; 2141 } 2142 #endif /* IPSEC */ 2143 2144 default: 2145 error = ENOPROTOOPT; 2146 break; 2147 } 2148 break; 2149 } 2150 } 2151 return (error); 2152 } 2153 2154 int 2155 ip6_raw_ctloutput(struct socket *so, struct sockopt *sopt) 2156 { 2157 int error = 0, optval, optlen; 2158 const int icmp6off = offsetof(struct icmp6_hdr, icmp6_cksum); 2159 struct inpcb *in6p = sotoinpcb(so); 2160 int level, op, optname; 2161 2162 level = sopt->sopt_level; 2163 op = sopt->sopt_dir; 2164 optname = sopt->sopt_name; 2165 optlen = sopt->sopt_valsize; 2166 2167 if (level != IPPROTO_IPV6) { 2168 return (EINVAL); 2169 } 2170 2171 switch (optname) { 2172 case IPV6_CHECKSUM: 2173 /* 2174 * For ICMPv6 sockets, no modification allowed for checksum 2175 * offset, permit "no change" values to help existing apps. 2176 * 2177 * RFC3542 says: "An attempt to set IPV6_CHECKSUM 2178 * for an ICMPv6 socket will fail." 2179 * The current behavior does not meet RFC3542. 2180 */ 2181 switch (op) { 2182 case SOPT_SET: 2183 if (optlen != sizeof(int)) { 2184 error = EINVAL; 2185 break; 2186 } 2187 error = sooptcopyin(sopt, &optval, sizeof(optval), 2188 sizeof(optval)); 2189 if (error) 2190 break; 2191 if ((optval % 2) != 0) { 2192 /* the API assumes even offset values */ 2193 error = EINVAL; 2194 } else if (so->so_proto->pr_protocol == 2195 IPPROTO_ICMPV6) { 2196 if (optval != icmp6off) 2197 error = EINVAL; 2198 } else 2199 in6p->in6p_cksum = optval; 2200 break; 2201 2202 case SOPT_GET: 2203 if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) 2204 optval = icmp6off; 2205 else 2206 optval = in6p->in6p_cksum; 2207 2208 error = sooptcopyout(sopt, &optval, sizeof(optval)); 2209 break; 2210 2211 default: 2212 error = EINVAL; 2213 break; 2214 } 2215 break; 2216 2217 default: 2218 error = ENOPROTOOPT; 2219 break; 2220 } 2221 2222 return (error); 2223 } 2224 2225 /* 2226 * Set up IP6 options in pcb for insertion in output packets or 2227 * specifying behavior of outgoing packets. 2228 */ 2229 static int 2230 ip6_pcbopts(struct ip6_pktopts **pktopt, struct mbuf *m, 2231 struct socket *so, struct sockopt *sopt) 2232 { 2233 struct ip6_pktopts *opt = *pktopt; 2234 int error = 0; 2235 struct thread *td = sopt->sopt_td; 2236 2237 /* turn off any old options. */ 2238 if (opt) { 2239 #ifdef DIAGNOSTIC 2240 if (opt->ip6po_pktinfo || opt->ip6po_nexthop || 2241 opt->ip6po_hbh || opt->ip6po_dest1 || opt->ip6po_dest2 || 2242 opt->ip6po_rhinfo.ip6po_rhi_rthdr) 2243 printf("ip6_pcbopts: all specified options are cleared.\n"); 2244 #endif 2245 ip6_clearpktopts(opt, -1); 2246 } else 2247 opt = malloc(sizeof(*opt), M_IP6OPT, M_WAITOK); 2248 *pktopt = NULL; 2249 2250 if (!m || m->m_len == 0) { 2251 /* 2252 * Only turning off any previous options, regardless of 2253 * whether the opt is just created or given. 2254 */ 2255 free(opt, M_IP6OPT); 2256 return (0); 2257 } 2258 2259 /* set options specified by user. */ 2260 if ((error = ip6_setpktopts(m, opt, NULL, (td != NULL) ? 2261 td->td_ucred : NULL, so->so_proto->pr_protocol)) != 0) { 2262 ip6_clearpktopts(opt, -1); /* XXX: discard all options */ 2263 free(opt, M_IP6OPT); 2264 return (error); 2265 } 2266 *pktopt = opt; 2267 return (0); 2268 } 2269 2270 /* 2271 * initialize ip6_pktopts. beware that there are non-zero default values in 2272 * the struct. 2273 */ 2274 void 2275 ip6_initpktopts(struct ip6_pktopts *opt) 2276 { 2277 2278 bzero(opt, sizeof(*opt)); 2279 opt->ip6po_hlim = -1; /* -1 means default hop limit */ 2280 opt->ip6po_tclass = -1; /* -1 means default traffic class */ 2281 opt->ip6po_minmtu = IP6PO_MINMTU_MCASTONLY; 2282 opt->ip6po_prefer_tempaddr = IP6PO_TEMPADDR_SYSTEM; 2283 } 2284 2285 static int 2286 ip6_pcbopt(int optname, u_char *buf, int len, struct ip6_pktopts **pktopt, 2287 struct ucred *cred, int uproto) 2288 { 2289 struct ip6_pktopts *opt; 2290 2291 if (*pktopt == NULL) { 2292 *pktopt = malloc(sizeof(struct ip6_pktopts), M_IP6OPT, 2293 M_WAITOK); 2294 ip6_initpktopts(*pktopt); 2295 } 2296 opt = *pktopt; 2297 2298 return (ip6_setpktopt(optname, buf, len, opt, cred, 1, 0, uproto)); 2299 } 2300 2301 static int 2302 ip6_getpcbopt(struct ip6_pktopts *pktopt, int optname, struct sockopt *sopt) 2303 { 2304 void *optdata = NULL; 2305 int optdatalen = 0; 2306 struct ip6_ext *ip6e; 2307 int error = 0; 2308 struct in6_pktinfo null_pktinfo; 2309 int deftclass = 0, on; 2310 int defminmtu = IP6PO_MINMTU_MCASTONLY; 2311 int defpreftemp = IP6PO_TEMPADDR_SYSTEM; 2312 2313 switch (optname) { 2314 case IPV6_PKTINFO: 2315 if (pktopt && pktopt->ip6po_pktinfo) 2316 optdata = (void *)pktopt->ip6po_pktinfo; 2317 else { 2318 /* XXX: we don't have to do this every time... */ 2319 bzero(&null_pktinfo, sizeof(null_pktinfo)); 2320 optdata = (void *)&null_pktinfo; 2321 } 2322 optdatalen = sizeof(struct in6_pktinfo); 2323 break; 2324 case IPV6_TCLASS: 2325 if (pktopt && pktopt->ip6po_tclass >= 0) 2326 optdata = (void *)&pktopt->ip6po_tclass; 2327 else 2328 optdata = (void *)&deftclass; 2329 optdatalen = sizeof(int); 2330 break; 2331 case IPV6_HOPOPTS: 2332 if (pktopt && pktopt->ip6po_hbh) { 2333 optdata = (void *)pktopt->ip6po_hbh; 2334 ip6e = (struct ip6_ext *)pktopt->ip6po_hbh; 2335 optdatalen = (ip6e->ip6e_len + 1) << 3; 2336 } 2337 break; 2338 case IPV6_RTHDR: 2339 if (pktopt && pktopt->ip6po_rthdr) { 2340 optdata = (void *)pktopt->ip6po_rthdr; 2341 ip6e = (struct ip6_ext *)pktopt->ip6po_rthdr; 2342 optdatalen = (ip6e->ip6e_len + 1) << 3; 2343 } 2344 break; 2345 case IPV6_RTHDRDSTOPTS: 2346 if (pktopt && pktopt->ip6po_dest1) { 2347 optdata = (void *)pktopt->ip6po_dest1; 2348 ip6e = (struct ip6_ext *)pktopt->ip6po_dest1; 2349 optdatalen = (ip6e->ip6e_len + 1) << 3; 2350 } 2351 break; 2352 case IPV6_DSTOPTS: 2353 if (pktopt && pktopt->ip6po_dest2) { 2354 optdata = (void *)pktopt->ip6po_dest2; 2355 ip6e = (struct ip6_ext *)pktopt->ip6po_dest2; 2356 optdatalen = (ip6e->ip6e_len + 1) << 3; 2357 } 2358 break; 2359 case IPV6_NEXTHOP: 2360 if (pktopt && pktopt->ip6po_nexthop) { 2361 optdata = (void *)pktopt->ip6po_nexthop; 2362 optdatalen = pktopt->ip6po_nexthop->sa_len; 2363 } 2364 break; 2365 case IPV6_USE_MIN_MTU: 2366 if (pktopt) 2367 optdata = (void *)&pktopt->ip6po_minmtu; 2368 else 2369 optdata = (void *)&defminmtu; 2370 optdatalen = sizeof(int); 2371 break; 2372 case IPV6_DONTFRAG: 2373 if (pktopt && ((pktopt->ip6po_flags) & IP6PO_DONTFRAG)) 2374 on = 1; 2375 else 2376 on = 0; 2377 optdata = (void *)&on; 2378 optdatalen = sizeof(on); 2379 break; 2380 case IPV6_PREFER_TEMPADDR: 2381 if (pktopt) 2382 optdata = (void *)&pktopt->ip6po_prefer_tempaddr; 2383 else 2384 optdata = (void *)&defpreftemp; 2385 optdatalen = sizeof(int); 2386 break; 2387 default: /* should not happen */ 2388 #ifdef DIAGNOSTIC 2389 panic("ip6_getpcbopt: unexpected option\n"); 2390 #endif 2391 return (ENOPROTOOPT); 2392 } 2393 2394 error = sooptcopyout(sopt, optdata, optdatalen); 2395 2396 return (error); 2397 } 2398 2399 void 2400 ip6_clearpktopts(struct ip6_pktopts *pktopt, int optname) 2401 { 2402 if (pktopt == NULL) 2403 return; 2404 2405 if (optname == -1 || optname == IPV6_PKTINFO) { 2406 if (pktopt->ip6po_pktinfo) 2407 free(pktopt->ip6po_pktinfo, M_IP6OPT); 2408 pktopt->ip6po_pktinfo = NULL; 2409 } 2410 if (optname == -1 || optname == IPV6_HOPLIMIT) 2411 pktopt->ip6po_hlim = -1; 2412 if (optname == -1 || optname == IPV6_TCLASS) 2413 pktopt->ip6po_tclass = -1; 2414 if (optname == -1 || optname == IPV6_NEXTHOP) { 2415 if (pktopt->ip6po_nextroute.ro_rt) { 2416 RTFREE(pktopt->ip6po_nextroute.ro_rt); 2417 pktopt->ip6po_nextroute.ro_rt = NULL; 2418 } 2419 if (pktopt->ip6po_nexthop) 2420 free(pktopt->ip6po_nexthop, M_IP6OPT); 2421 pktopt->ip6po_nexthop = NULL; 2422 } 2423 if (optname == -1 || optname == IPV6_HOPOPTS) { 2424 if (pktopt->ip6po_hbh) 2425 free(pktopt->ip6po_hbh, M_IP6OPT); 2426 pktopt->ip6po_hbh = NULL; 2427 } 2428 if (optname == -1 || optname == IPV6_RTHDRDSTOPTS) { 2429 if (pktopt->ip6po_dest1) 2430 free(pktopt->ip6po_dest1, M_IP6OPT); 2431 pktopt->ip6po_dest1 = NULL; 2432 } 2433 if (optname == -1 || optname == IPV6_RTHDR) { 2434 if (pktopt->ip6po_rhinfo.ip6po_rhi_rthdr) 2435 free(pktopt->ip6po_rhinfo.ip6po_rhi_rthdr, M_IP6OPT); 2436 pktopt->ip6po_rhinfo.ip6po_rhi_rthdr = NULL; 2437 if (pktopt->ip6po_route.ro_rt) { 2438 RTFREE(pktopt->ip6po_route.ro_rt); 2439 pktopt->ip6po_route.ro_rt = NULL; 2440 } 2441 } 2442 if (optname == -1 || optname == IPV6_DSTOPTS) { 2443 if (pktopt->ip6po_dest2) 2444 free(pktopt->ip6po_dest2, M_IP6OPT); 2445 pktopt->ip6po_dest2 = NULL; 2446 } 2447 } 2448 2449 #define PKTOPT_EXTHDRCPY(type) \ 2450 do {\ 2451 if (src->type) {\ 2452 int hlen = (((struct ip6_ext *)src->type)->ip6e_len + 1) << 3;\ 2453 dst->type = malloc(hlen, M_IP6OPT, canwait);\ 2454 if (dst->type == NULL && canwait == M_NOWAIT)\ 2455 goto bad;\ 2456 bcopy(src->type, dst->type, hlen);\ 2457 }\ 2458 } while (/*CONSTCOND*/ 0) 2459 2460 static int 2461 copypktopts(struct ip6_pktopts *dst, struct ip6_pktopts *src, int canwait) 2462 { 2463 if (dst == NULL || src == NULL) { 2464 printf("ip6_clearpktopts: invalid argument\n"); 2465 return (EINVAL); 2466 } 2467 2468 dst->ip6po_hlim = src->ip6po_hlim; 2469 dst->ip6po_tclass = src->ip6po_tclass; 2470 dst->ip6po_flags = src->ip6po_flags; 2471 dst->ip6po_minmtu = src->ip6po_minmtu; 2472 dst->ip6po_prefer_tempaddr = src->ip6po_prefer_tempaddr; 2473 if (src->ip6po_pktinfo) { 2474 dst->ip6po_pktinfo = malloc(sizeof(*dst->ip6po_pktinfo), 2475 M_IP6OPT, canwait); 2476 if (dst->ip6po_pktinfo == NULL) 2477 goto bad; 2478 *dst->ip6po_pktinfo = *src->ip6po_pktinfo; 2479 } 2480 if (src->ip6po_nexthop) { 2481 dst->ip6po_nexthop = malloc(src->ip6po_nexthop->sa_len, 2482 M_IP6OPT, canwait); 2483 if (dst->ip6po_nexthop == NULL) 2484 goto bad; 2485 bcopy(src->ip6po_nexthop, dst->ip6po_nexthop, 2486 src->ip6po_nexthop->sa_len); 2487 } 2488 PKTOPT_EXTHDRCPY(ip6po_hbh); 2489 PKTOPT_EXTHDRCPY(ip6po_dest1); 2490 PKTOPT_EXTHDRCPY(ip6po_dest2); 2491 PKTOPT_EXTHDRCPY(ip6po_rthdr); /* not copy the cached route */ 2492 return (0); 2493 2494 bad: 2495 ip6_clearpktopts(dst, -1); 2496 return (ENOBUFS); 2497 } 2498 #undef PKTOPT_EXTHDRCPY 2499 2500 struct ip6_pktopts * 2501 ip6_copypktopts(struct ip6_pktopts *src, int canwait) 2502 { 2503 int error; 2504 struct ip6_pktopts *dst; 2505 2506 dst = malloc(sizeof(*dst), M_IP6OPT, canwait); 2507 if (dst == NULL) 2508 return (NULL); 2509 ip6_initpktopts(dst); 2510 2511 if ((error = copypktopts(dst, src, canwait)) != 0) { 2512 free(dst, M_IP6OPT); 2513 return (NULL); 2514 } 2515 2516 return (dst); 2517 } 2518 2519 void 2520 ip6_freepcbopts(struct ip6_pktopts *pktopt) 2521 { 2522 if (pktopt == NULL) 2523 return; 2524 2525 ip6_clearpktopts(pktopt, -1); 2526 2527 free(pktopt, M_IP6OPT); 2528 } 2529 2530 /* 2531 * Set IPv6 outgoing packet options based on advanced API. 2532 */ 2533 int 2534 ip6_setpktopts(struct mbuf *control, struct ip6_pktopts *opt, 2535 struct ip6_pktopts *stickyopt, struct ucred *cred, int uproto) 2536 { 2537 struct cmsghdr *cm = 0; 2538 2539 if (control == NULL || opt == NULL) 2540 return (EINVAL); 2541 2542 ip6_initpktopts(opt); 2543 if (stickyopt) { 2544 int error; 2545 2546 /* 2547 * If stickyopt is provided, make a local copy of the options 2548 * for this particular packet, then override them by ancillary 2549 * objects. 2550 * XXX: copypktopts() does not copy the cached route to a next 2551 * hop (if any). This is not very good in terms of efficiency, 2552 * but we can allow this since this option should be rarely 2553 * used. 2554 */ 2555 if ((error = copypktopts(opt, stickyopt, M_NOWAIT)) != 0) 2556 return (error); 2557 } 2558 2559 /* 2560 * XXX: Currently, we assume all the optional information is stored 2561 * in a single mbuf. 2562 */ 2563 if (control->m_next) 2564 return (EINVAL); 2565 2566 for (; control->m_len > 0; control->m_data += CMSG_ALIGN(cm->cmsg_len), 2567 control->m_len -= CMSG_ALIGN(cm->cmsg_len)) { 2568 int error; 2569 2570 if (control->m_len < CMSG_LEN(0)) 2571 return (EINVAL); 2572 2573 cm = mtod(control, struct cmsghdr *); 2574 if (cm->cmsg_len == 0 || cm->cmsg_len > control->m_len) 2575 return (EINVAL); 2576 if (cm->cmsg_level != IPPROTO_IPV6) 2577 continue; 2578 2579 error = ip6_setpktopt(cm->cmsg_type, CMSG_DATA(cm), 2580 cm->cmsg_len - CMSG_LEN(0), opt, cred, 0, 1, uproto); 2581 if (error) 2582 return (error); 2583 } 2584 2585 return (0); 2586 } 2587 2588 /* 2589 * Set a particular packet option, as a sticky option or an ancillary data 2590 * item. "len" can be 0 only when it's a sticky option. 2591 * We have 4 cases of combination of "sticky" and "cmsg": 2592 * "sticky=0, cmsg=0": impossible 2593 * "sticky=0, cmsg=1": RFC2292 or RFC3542 ancillary data 2594 * "sticky=1, cmsg=0": RFC3542 socket option 2595 * "sticky=1, cmsg=1": RFC2292 socket option 2596 */ 2597 static int 2598 ip6_setpktopt(int optname, u_char *buf, int len, struct ip6_pktopts *opt, 2599 struct ucred *cred, int sticky, int cmsg, int uproto) 2600 { 2601 int minmtupolicy, preftemp; 2602 int error; 2603 2604 if (!sticky && !cmsg) { 2605 #ifdef DIAGNOSTIC 2606 printf("ip6_setpktopt: impossible case\n"); 2607 #endif 2608 return (EINVAL); 2609 } 2610 2611 /* 2612 * IPV6_2292xxx is for backward compatibility to RFC2292, and should 2613 * not be specified in the context of RFC3542. Conversely, 2614 * RFC3542 types should not be specified in the context of RFC2292. 2615 */ 2616 if (!cmsg) { 2617 switch (optname) { 2618 case IPV6_2292PKTINFO: 2619 case IPV6_2292HOPLIMIT: 2620 case IPV6_2292NEXTHOP: 2621 case IPV6_2292HOPOPTS: 2622 case IPV6_2292DSTOPTS: 2623 case IPV6_2292RTHDR: 2624 case IPV6_2292PKTOPTIONS: 2625 return (ENOPROTOOPT); 2626 } 2627 } 2628 if (sticky && cmsg) { 2629 switch (optname) { 2630 case IPV6_PKTINFO: 2631 case IPV6_HOPLIMIT: 2632 case IPV6_NEXTHOP: 2633 case IPV6_HOPOPTS: 2634 case IPV6_DSTOPTS: 2635 case IPV6_RTHDRDSTOPTS: 2636 case IPV6_RTHDR: 2637 case IPV6_USE_MIN_MTU: 2638 case IPV6_DONTFRAG: 2639 case IPV6_TCLASS: 2640 case IPV6_PREFER_TEMPADDR: /* XXX: not an RFC3542 option */ 2641 return (ENOPROTOOPT); 2642 } 2643 } 2644 2645 switch (optname) { 2646 case IPV6_2292PKTINFO: 2647 case IPV6_PKTINFO: 2648 { 2649 struct ifnet *ifp = NULL; 2650 struct in6_pktinfo *pktinfo; 2651 2652 if (len != sizeof(struct in6_pktinfo)) 2653 return (EINVAL); 2654 2655 pktinfo = (struct in6_pktinfo *)buf; 2656 2657 /* 2658 * An application can clear any sticky IPV6_PKTINFO option by 2659 * doing a "regular" setsockopt with ipi6_addr being 2660 * in6addr_any and ipi6_ifindex being zero. 2661 * [RFC 3542, Section 6] 2662 */ 2663 if (optname == IPV6_PKTINFO && opt->ip6po_pktinfo && 2664 pktinfo->ipi6_ifindex == 0 && 2665 IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) { 2666 ip6_clearpktopts(opt, optname); 2667 break; 2668 } 2669 2670 if (uproto == IPPROTO_TCP && optname == IPV6_PKTINFO && 2671 sticky && !IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) { 2672 return (EINVAL); 2673 } 2674 2675 /* validate the interface index if specified. */ 2676 if (pktinfo->ipi6_ifindex > V_if_index || 2677 pktinfo->ipi6_ifindex < 0) { 2678 return (ENXIO); 2679 } 2680 if (pktinfo->ipi6_ifindex) { 2681 ifp = ifnet_byindex(pktinfo->ipi6_ifindex); 2682 if (ifp == NULL) 2683 return (ENXIO); 2684 } 2685 2686 /* 2687 * We store the address anyway, and let in6_selectsrc() 2688 * validate the specified address. This is because ipi6_addr 2689 * may not have enough information about its scope zone, and 2690 * we may need additional information (such as outgoing 2691 * interface or the scope zone of a destination address) to 2692 * disambiguate the scope. 2693 * XXX: the delay of the validation may confuse the 2694 * application when it is used as a sticky option. 2695 */ 2696 if (opt->ip6po_pktinfo == NULL) { 2697 opt->ip6po_pktinfo = malloc(sizeof(*pktinfo), 2698 M_IP6OPT, M_NOWAIT); 2699 if (opt->ip6po_pktinfo == NULL) 2700 return (ENOBUFS); 2701 } 2702 bcopy(pktinfo, opt->ip6po_pktinfo, sizeof(*pktinfo)); 2703 break; 2704 } 2705 2706 case IPV6_2292HOPLIMIT: 2707 case IPV6_HOPLIMIT: 2708 { 2709 int *hlimp; 2710 2711 /* 2712 * RFC 3542 deprecated the usage of sticky IPV6_HOPLIMIT 2713 * to simplify the ordering among hoplimit options. 2714 */ 2715 if (optname == IPV6_HOPLIMIT && sticky) 2716 return (ENOPROTOOPT); 2717 2718 if (len != sizeof(int)) 2719 return (EINVAL); 2720 hlimp = (int *)buf; 2721 if (*hlimp < -1 || *hlimp > 255) 2722 return (EINVAL); 2723 2724 opt->ip6po_hlim = *hlimp; 2725 break; 2726 } 2727 2728 case IPV6_TCLASS: 2729 { 2730 int tclass; 2731 2732 if (len != sizeof(int)) 2733 return (EINVAL); 2734 tclass = *(int *)buf; 2735 if (tclass < -1 || tclass > 255) 2736 return (EINVAL); 2737 2738 opt->ip6po_tclass = tclass; 2739 break; 2740 } 2741 2742 case IPV6_2292NEXTHOP: 2743 case IPV6_NEXTHOP: 2744 if (cred != NULL) { 2745 error = priv_check_cred(cred, 2746 PRIV_NETINET_SETHDROPTS, 0); 2747 if (error) 2748 return (error); 2749 } 2750 2751 if (len == 0) { /* just remove the option */ 2752 ip6_clearpktopts(opt, IPV6_NEXTHOP); 2753 break; 2754 } 2755 2756 /* check if cmsg_len is large enough for sa_len */ 2757 if (len < sizeof(struct sockaddr) || len < *buf) 2758 return (EINVAL); 2759 2760 switch (((struct sockaddr *)buf)->sa_family) { 2761 case AF_INET6: 2762 { 2763 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)buf; 2764 int error; 2765 2766 if (sa6->sin6_len != sizeof(struct sockaddr_in6)) 2767 return (EINVAL); 2768 2769 if (IN6_IS_ADDR_UNSPECIFIED(&sa6->sin6_addr) || 2770 IN6_IS_ADDR_MULTICAST(&sa6->sin6_addr)) { 2771 return (EINVAL); 2772 } 2773 if ((error = sa6_embedscope(sa6, V_ip6_use_defzone)) 2774 != 0) { 2775 return (error); 2776 } 2777 break; 2778 } 2779 case AF_LINK: /* should eventually be supported */ 2780 default: 2781 return (EAFNOSUPPORT); 2782 } 2783 2784 /* turn off the previous option, then set the new option. */ 2785 ip6_clearpktopts(opt, IPV6_NEXTHOP); 2786 opt->ip6po_nexthop = malloc(*buf, M_IP6OPT, M_NOWAIT); 2787 if (opt->ip6po_nexthop == NULL) 2788 return (ENOBUFS); 2789 bcopy(buf, opt->ip6po_nexthop, *buf); 2790 break; 2791 2792 case IPV6_2292HOPOPTS: 2793 case IPV6_HOPOPTS: 2794 { 2795 struct ip6_hbh *hbh; 2796 int hbhlen; 2797 2798 /* 2799 * XXX: We don't allow a non-privileged user to set ANY HbH 2800 * options, since per-option restriction has too much 2801 * overhead. 2802 */ 2803 if (cred != NULL) { 2804 error = priv_check_cred(cred, 2805 PRIV_NETINET_SETHDROPTS, 0); 2806 if (error) 2807 return (error); 2808 } 2809 2810 if (len == 0) { 2811 ip6_clearpktopts(opt, IPV6_HOPOPTS); 2812 break; /* just remove the option */ 2813 } 2814 2815 /* message length validation */ 2816 if (len < sizeof(struct ip6_hbh)) 2817 return (EINVAL); 2818 hbh = (struct ip6_hbh *)buf; 2819 hbhlen = (hbh->ip6h_len + 1) << 3; 2820 if (len != hbhlen) 2821 return (EINVAL); 2822 2823 /* turn off the previous option, then set the new option. */ 2824 ip6_clearpktopts(opt, IPV6_HOPOPTS); 2825 opt->ip6po_hbh = malloc(hbhlen, M_IP6OPT, M_NOWAIT); 2826 if (opt->ip6po_hbh == NULL) 2827 return (ENOBUFS); 2828 bcopy(hbh, opt->ip6po_hbh, hbhlen); 2829 2830 break; 2831 } 2832 2833 case IPV6_2292DSTOPTS: 2834 case IPV6_DSTOPTS: 2835 case IPV6_RTHDRDSTOPTS: 2836 { 2837 struct ip6_dest *dest, **newdest = NULL; 2838 int destlen; 2839 2840 if (cred != NULL) { /* XXX: see the comment for IPV6_HOPOPTS */ 2841 error = priv_check_cred(cred, 2842 PRIV_NETINET_SETHDROPTS, 0); 2843 if (error) 2844 return (error); 2845 } 2846 2847 if (len == 0) { 2848 ip6_clearpktopts(opt, optname); 2849 break; /* just remove the option */ 2850 } 2851 2852 /* message length validation */ 2853 if (len < sizeof(struct ip6_dest)) 2854 return (EINVAL); 2855 dest = (struct ip6_dest *)buf; 2856 destlen = (dest->ip6d_len + 1) << 3; 2857 if (len != destlen) 2858 return (EINVAL); 2859 2860 /* 2861 * Determine the position that the destination options header 2862 * should be inserted; before or after the routing header. 2863 */ 2864 switch (optname) { 2865 case IPV6_2292DSTOPTS: 2866 /* 2867 * The old advacned API is ambiguous on this point. 2868 * Our approach is to determine the position based 2869 * according to the existence of a routing header. 2870 * Note, however, that this depends on the order of the 2871 * extension headers in the ancillary data; the 1st 2872 * part of the destination options header must appear 2873 * before the routing header in the ancillary data, 2874 * too. 2875 * RFC3542 solved the ambiguity by introducing 2876 * separate ancillary data or option types. 2877 */ 2878 if (opt->ip6po_rthdr == NULL) 2879 newdest = &opt->ip6po_dest1; 2880 else 2881 newdest = &opt->ip6po_dest2; 2882 break; 2883 case IPV6_RTHDRDSTOPTS: 2884 newdest = &opt->ip6po_dest1; 2885 break; 2886 case IPV6_DSTOPTS: 2887 newdest = &opt->ip6po_dest2; 2888 break; 2889 } 2890 2891 /* turn off the previous option, then set the new option. */ 2892 ip6_clearpktopts(opt, optname); 2893 *newdest = malloc(destlen, M_IP6OPT, M_NOWAIT); 2894 if (*newdest == NULL) 2895 return (ENOBUFS); 2896 bcopy(dest, *newdest, destlen); 2897 2898 break; 2899 } 2900 2901 case IPV6_2292RTHDR: 2902 case IPV6_RTHDR: 2903 { 2904 struct ip6_rthdr *rth; 2905 int rthlen; 2906 2907 if (len == 0) { 2908 ip6_clearpktopts(opt, IPV6_RTHDR); 2909 break; /* just remove the option */ 2910 } 2911 2912 /* message length validation */ 2913 if (len < sizeof(struct ip6_rthdr)) 2914 return (EINVAL); 2915 rth = (struct ip6_rthdr *)buf; 2916 rthlen = (rth->ip6r_len + 1) << 3; 2917 if (len != rthlen) 2918 return (EINVAL); 2919 2920 switch (rth->ip6r_type) { 2921 case IPV6_RTHDR_TYPE_0: 2922 if (rth->ip6r_len == 0) /* must contain one addr */ 2923 return (EINVAL); 2924 if (rth->ip6r_len % 2) /* length must be even */ 2925 return (EINVAL); 2926 if (rth->ip6r_len / 2 != rth->ip6r_segleft) 2927 return (EINVAL); 2928 break; 2929 default: 2930 return (EINVAL); /* not supported */ 2931 } 2932 2933 /* turn off the previous option */ 2934 ip6_clearpktopts(opt, IPV6_RTHDR); 2935 opt->ip6po_rthdr = malloc(rthlen, M_IP6OPT, M_NOWAIT); 2936 if (opt->ip6po_rthdr == NULL) 2937 return (ENOBUFS); 2938 bcopy(rth, opt->ip6po_rthdr, rthlen); 2939 2940 break; 2941 } 2942 2943 case IPV6_USE_MIN_MTU: 2944 if (len != sizeof(int)) 2945 return (EINVAL); 2946 minmtupolicy = *(int *)buf; 2947 if (minmtupolicy != IP6PO_MINMTU_MCASTONLY && 2948 minmtupolicy != IP6PO_MINMTU_DISABLE && 2949 minmtupolicy != IP6PO_MINMTU_ALL) { 2950 return (EINVAL); 2951 } 2952 opt->ip6po_minmtu = minmtupolicy; 2953 break; 2954 2955 case IPV6_DONTFRAG: 2956 if (len != sizeof(int)) 2957 return (EINVAL); 2958 2959 if (uproto == IPPROTO_TCP || *(int *)buf == 0) { 2960 /* 2961 * we ignore this option for TCP sockets. 2962 * (RFC3542 leaves this case unspecified.) 2963 */ 2964 opt->ip6po_flags &= ~IP6PO_DONTFRAG; 2965 } else 2966 opt->ip6po_flags |= IP6PO_DONTFRAG; 2967 break; 2968 2969 case IPV6_PREFER_TEMPADDR: 2970 if (len != sizeof(int)) 2971 return (EINVAL); 2972 preftemp = *(int *)buf; 2973 if (preftemp != IP6PO_TEMPADDR_SYSTEM && 2974 preftemp != IP6PO_TEMPADDR_NOTPREFER && 2975 preftemp != IP6PO_TEMPADDR_PREFER) { 2976 return (EINVAL); 2977 } 2978 opt->ip6po_prefer_tempaddr = preftemp; 2979 break; 2980 2981 default: 2982 return (ENOPROTOOPT); 2983 } /* end of switch */ 2984 2985 return (0); 2986 } 2987 2988 /* 2989 * Routine called from ip6_output() to loop back a copy of an IP6 multicast 2990 * packet to the input queue of a specified interface. Note that this 2991 * calls the output routine of the loopback "driver", but with an interface 2992 * pointer that might NOT be &loif -- easier than replicating that code here. 2993 */ 2994 void 2995 ip6_mloopback(struct ifnet *ifp, struct mbuf *m, struct sockaddr_in6 *dst) 2996 { 2997 struct mbuf *copym; 2998 struct ip6_hdr *ip6; 2999 3000 copym = m_copy(m, 0, M_COPYALL); 3001 if (copym == NULL) 3002 return; 3003 3004 /* 3005 * Make sure to deep-copy IPv6 header portion in case the data 3006 * is in an mbuf cluster, so that we can safely override the IPv6 3007 * header portion later. 3008 */ 3009 if ((copym->m_flags & M_EXT) != 0 || 3010 copym->m_len < sizeof(struct ip6_hdr)) { 3011 copym = m_pullup(copym, sizeof(struct ip6_hdr)); 3012 if (copym == NULL) 3013 return; 3014 } 3015 3016 #ifdef DIAGNOSTIC 3017 if (copym->m_len < sizeof(*ip6)) { 3018 m_freem(copym); 3019 return; 3020 } 3021 #endif 3022 3023 ip6 = mtod(copym, struct ip6_hdr *); 3024 /* 3025 * clear embedded scope identifiers if necessary. 3026 * in6_clearscope will touch the addresses only when necessary. 3027 */ 3028 in6_clearscope(&ip6->ip6_src); 3029 in6_clearscope(&ip6->ip6_dst); 3030 3031 (void)if_simloop(ifp, copym, dst->sin6_family, 0); 3032 } 3033 3034 /* 3035 * Chop IPv6 header off from the payload. 3036 */ 3037 static int 3038 ip6_splithdr(struct mbuf *m, struct ip6_exthdrs *exthdrs) 3039 { 3040 struct mbuf *mh; 3041 struct ip6_hdr *ip6; 3042 3043 ip6 = mtod(m, struct ip6_hdr *); 3044 if (m->m_len > sizeof(*ip6)) { 3045 MGETHDR(mh, M_DONTWAIT, MT_HEADER); 3046 if (mh == 0) { 3047 m_freem(m); 3048 return ENOBUFS; 3049 } 3050 M_MOVE_PKTHDR(mh, m); 3051 MH_ALIGN(mh, sizeof(*ip6)); 3052 m->m_len -= sizeof(*ip6); 3053 m->m_data += sizeof(*ip6); 3054 mh->m_next = m; 3055 m = mh; 3056 m->m_len = sizeof(*ip6); 3057 bcopy((caddr_t)ip6, mtod(m, caddr_t), sizeof(*ip6)); 3058 } 3059 exthdrs->ip6e_ip6 = m; 3060 return 0; 3061 } 3062 3063 /* 3064 * Compute IPv6 extension header length. 3065 */ 3066 int 3067 ip6_optlen(struct inpcb *in6p) 3068 { 3069 int len; 3070 3071 if (!in6p->in6p_outputopts) 3072 return 0; 3073 3074 len = 0; 3075 #define elen(x) \ 3076 (((struct ip6_ext *)(x)) ? (((struct ip6_ext *)(x))->ip6e_len + 1) << 3 : 0) 3077 3078 len += elen(in6p->in6p_outputopts->ip6po_hbh); 3079 if (in6p->in6p_outputopts->ip6po_rthdr) 3080 /* dest1 is valid with rthdr only */ 3081 len += elen(in6p->in6p_outputopts->ip6po_dest1); 3082 len += elen(in6p->in6p_outputopts->ip6po_rthdr); 3083 len += elen(in6p->in6p_outputopts->ip6po_dest2); 3084 return len; 3085 #undef elen 3086 }
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