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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("$FreeBSD$"); 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 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 if 1000 * application wanted to know the MTU value. Also return an 1001 * error code (this is not described in the API spec). 1002 */ 1003 if (inp != NULL) 1004 ip6_notify_pmtu(inp, &dst_sa, (u_int32_t)mtu); 1005 error = EMSGSIZE; 1006 goto bad; 1007 } 1008 1009 /* 1010 * transmit packet without fragmentation 1011 */ 1012 if (dontfrag || (!alwaysfrag && tlen <= mtu)) { /* case 1-a and 2-a */ 1013 struct in6_ifaddr *ia6; 1014 1015 ip6 = mtod(m, struct ip6_hdr *); 1016 ia6 = in6_ifawithifp(ifp, &ip6->ip6_src); 1017 if (ia6) { 1018 /* Record statistics for this interface address. */ 1019 ia6->ia_ifa.if_opackets++; 1020 ia6->ia_ifa.if_obytes += m->m_pkthdr.len; 1021 ifa_free(&ia6->ia_ifa); 1022 } 1023 error = nd6_output(ifp, origifp, m, dst, ro->ro_rt); 1024 goto done; 1025 } 1026 1027 /* 1028 * try to fragment the packet. case 1-b and 3 1029 */ 1030 if (mtu < IPV6_MMTU) { 1031 /* path MTU cannot be less than IPV6_MMTU */ 1032 error = EMSGSIZE; 1033 in6_ifstat_inc(ifp, ifs6_out_fragfail); 1034 goto bad; 1035 } else if (ip6->ip6_plen == 0) { 1036 /* jumbo payload cannot be fragmented */ 1037 error = EMSGSIZE; 1038 in6_ifstat_inc(ifp, ifs6_out_fragfail); 1039 goto bad; 1040 } else { 1041 struct mbuf **mnext, *m_frgpart; 1042 struct ip6_frag *ip6f; 1043 u_int32_t id = htonl(ip6_randomid()); 1044 u_char nextproto; 1045 1046 int qslots = ifp->if_snd.ifq_maxlen - ifp->if_snd.ifq_len; 1047 1048 /* 1049 * Too large for the destination or interface; 1050 * fragment if possible. 1051 * Must be able to put at least 8 bytes per fragment. 1052 */ 1053 hlen = unfragpartlen; 1054 if (mtu > IPV6_MAXPACKET) 1055 mtu = IPV6_MAXPACKET; 1056 1057 len = (mtu - hlen - sizeof(struct ip6_frag)) & ~7; 1058 if (len < 8) { 1059 error = EMSGSIZE; 1060 in6_ifstat_inc(ifp, ifs6_out_fragfail); 1061 goto bad; 1062 } 1063 1064 /* 1065 * Verify that we have any chance at all of being able to queue 1066 * the packet or packet fragments 1067 */ 1068 if (qslots <= 0 || ((u_int)qslots * (mtu - hlen) 1069 < tlen /* - hlen */)) { 1070 error = ENOBUFS; 1071 IP6STAT_INC(ip6s_odropped); 1072 goto bad; 1073 } 1074 1075 1076 /* 1077 * If the interface will not calculate checksums on 1078 * fragmented packets, then do it here. 1079 * XXX-BZ handle the hw offloading case. Need flags. 1080 */ 1081 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6) { 1082 in6_delayed_cksum(m, plen, hlen); 1083 m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA_IPV6; 1084 } 1085 #ifdef SCTP 1086 if (m->m_pkthdr.csum_flags & CSUM_SCTP_IPV6) { 1087 sctp_delayed_cksum(m, hlen); 1088 m->m_pkthdr.csum_flags &= ~CSUM_SCTP_IPV6; 1089 } 1090 #endif 1091 mnext = &m->m_nextpkt; 1092 1093 /* 1094 * Change the next header field of the last header in the 1095 * unfragmentable part. 1096 */ 1097 if (exthdrs.ip6e_rthdr) { 1098 nextproto = *mtod(exthdrs.ip6e_rthdr, u_char *); 1099 *mtod(exthdrs.ip6e_rthdr, u_char *) = IPPROTO_FRAGMENT; 1100 } else if (exthdrs.ip6e_dest1) { 1101 nextproto = *mtod(exthdrs.ip6e_dest1, u_char *); 1102 *mtod(exthdrs.ip6e_dest1, u_char *) = IPPROTO_FRAGMENT; 1103 } else if (exthdrs.ip6e_hbh) { 1104 nextproto = *mtod(exthdrs.ip6e_hbh, u_char *); 1105 *mtod(exthdrs.ip6e_hbh, u_char *) = IPPROTO_FRAGMENT; 1106 } else { 1107 nextproto = ip6->ip6_nxt; 1108 ip6->ip6_nxt = IPPROTO_FRAGMENT; 1109 } 1110 1111 /* 1112 * Loop through length of segment after first fragment, 1113 * make new header and copy data of each part and link onto 1114 * chain. 1115 */ 1116 m0 = m; 1117 for (off = hlen; off < tlen; off += len) { 1118 MGETHDR(m, M_DONTWAIT, MT_HEADER); 1119 if (!m) { 1120 error = ENOBUFS; 1121 IP6STAT_INC(ip6s_odropped); 1122 goto sendorfree; 1123 } 1124 m->m_pkthdr.rcvif = NULL; 1125 m->m_flags = m0->m_flags & M_COPYFLAGS; /* incl. FIB */ 1126 *mnext = m; 1127 mnext = &m->m_nextpkt; 1128 m->m_data += max_linkhdr; 1129 mhip6 = mtod(m, struct ip6_hdr *); 1130 *mhip6 = *ip6; 1131 m->m_len = sizeof(*mhip6); 1132 error = ip6_insertfraghdr(m0, m, hlen, &ip6f); 1133 if (error) { 1134 IP6STAT_INC(ip6s_odropped); 1135 goto sendorfree; 1136 } 1137 ip6f->ip6f_offlg = htons((u_short)((off - hlen) & ~7)); 1138 if (off + len >= tlen) 1139 len = tlen - off; 1140 else 1141 ip6f->ip6f_offlg |= IP6F_MORE_FRAG; 1142 mhip6->ip6_plen = htons((u_short)(len + hlen + 1143 sizeof(*ip6f) - sizeof(struct ip6_hdr))); 1144 if ((m_frgpart = m_copy(m0, off, len)) == 0) { 1145 error = ENOBUFS; 1146 IP6STAT_INC(ip6s_odropped); 1147 goto sendorfree; 1148 } 1149 m_cat(m, m_frgpart); 1150 m->m_pkthdr.len = len + hlen + sizeof(*ip6f); 1151 m->m_pkthdr.rcvif = NULL; 1152 ip6f->ip6f_reserved = 0; 1153 ip6f->ip6f_ident = id; 1154 ip6f->ip6f_nxt = nextproto; 1155 IP6STAT_INC(ip6s_ofragments); 1156 in6_ifstat_inc(ifp, ifs6_out_fragcreat); 1157 } 1158 1159 in6_ifstat_inc(ifp, ifs6_out_fragok); 1160 } 1161 1162 /* 1163 * Remove leading garbages. 1164 */ 1165 sendorfree: 1166 m = m0->m_nextpkt; 1167 m0->m_nextpkt = 0; 1168 m_freem(m0); 1169 for (m0 = m; m; m = m0) { 1170 m0 = m->m_nextpkt; 1171 m->m_nextpkt = 0; 1172 if (error == 0) { 1173 /* Record statistics for this interface address. */ 1174 if (ia) { 1175 ia->ia_ifa.if_opackets++; 1176 ia->ia_ifa.if_obytes += m->m_pkthdr.len; 1177 } 1178 error = nd6_output(ifp, origifp, m, dst, ro->ro_rt); 1179 } else 1180 m_freem(m); 1181 } 1182 1183 if (error == 0) 1184 IP6STAT_INC(ip6s_fragmented); 1185 1186 done: 1187 if (ro == &ip6route) 1188 RO_RTFREE(ro); 1189 if (ro_pmtu == &ip6route) 1190 RO_RTFREE(ro_pmtu); 1191 #ifdef IPSEC 1192 if (sp != NULL) 1193 KEY_FREESP(&sp); 1194 #endif 1195 1196 return (error); 1197 1198 freehdrs: 1199 m_freem(exthdrs.ip6e_hbh); /* m_freem will check if mbuf is 0 */ 1200 m_freem(exthdrs.ip6e_dest1); 1201 m_freem(exthdrs.ip6e_rthdr); 1202 m_freem(exthdrs.ip6e_dest2); 1203 /* FALLTHROUGH */ 1204 bad: 1205 if (m) 1206 m_freem(m); 1207 goto done; 1208 } 1209 1210 static int 1211 ip6_copyexthdr(struct mbuf **mp, caddr_t hdr, int hlen) 1212 { 1213 struct mbuf *m; 1214 1215 if (hlen > MCLBYTES) 1216 return (ENOBUFS); /* XXX */ 1217 1218 MGET(m, M_DONTWAIT, MT_DATA); 1219 if (!m) 1220 return (ENOBUFS); 1221 1222 if (hlen > MLEN) { 1223 MCLGET(m, M_DONTWAIT); 1224 if ((m->m_flags & M_EXT) == 0) { 1225 m_free(m); 1226 return (ENOBUFS); 1227 } 1228 } 1229 m->m_len = hlen; 1230 if (hdr) 1231 bcopy(hdr, mtod(m, caddr_t), hlen); 1232 1233 *mp = m; 1234 return (0); 1235 } 1236 1237 /* 1238 * Insert jumbo payload option. 1239 */ 1240 static int 1241 ip6_insert_jumboopt(struct ip6_exthdrs *exthdrs, u_int32_t plen) 1242 { 1243 struct mbuf *mopt; 1244 u_char *optbuf; 1245 u_int32_t v; 1246 1247 #define JUMBOOPTLEN 8 /* length of jumbo payload option and padding */ 1248 1249 /* 1250 * If there is no hop-by-hop options header, allocate new one. 1251 * If there is one but it doesn't have enough space to store the 1252 * jumbo payload option, allocate a cluster to store the whole options. 1253 * Otherwise, use it to store the options. 1254 */ 1255 if (exthdrs->ip6e_hbh == 0) { 1256 MGET(mopt, M_DONTWAIT, MT_DATA); 1257 if (mopt == 0) 1258 return (ENOBUFS); 1259 mopt->m_len = JUMBOOPTLEN; 1260 optbuf = mtod(mopt, u_char *); 1261 optbuf[1] = 0; /* = ((JUMBOOPTLEN) >> 3) - 1 */ 1262 exthdrs->ip6e_hbh = mopt; 1263 } else { 1264 struct ip6_hbh *hbh; 1265 1266 mopt = exthdrs->ip6e_hbh; 1267 if (M_TRAILINGSPACE(mopt) < JUMBOOPTLEN) { 1268 /* 1269 * XXX assumption: 1270 * - exthdrs->ip6e_hbh is not referenced from places 1271 * other than exthdrs. 1272 * - exthdrs->ip6e_hbh is not an mbuf chain. 1273 */ 1274 int oldoptlen = mopt->m_len; 1275 struct mbuf *n; 1276 1277 /* 1278 * XXX: give up if the whole (new) hbh header does 1279 * not fit even in an mbuf cluster. 1280 */ 1281 if (oldoptlen + JUMBOOPTLEN > MCLBYTES) 1282 return (ENOBUFS); 1283 1284 /* 1285 * As a consequence, we must always prepare a cluster 1286 * at this point. 1287 */ 1288 MGET(n, M_DONTWAIT, MT_DATA); 1289 if (n) { 1290 MCLGET(n, M_DONTWAIT); 1291 if ((n->m_flags & M_EXT) == 0) { 1292 m_freem(n); 1293 n = NULL; 1294 } 1295 } 1296 if (!n) 1297 return (ENOBUFS); 1298 n->m_len = oldoptlen + JUMBOOPTLEN; 1299 bcopy(mtod(mopt, caddr_t), mtod(n, caddr_t), 1300 oldoptlen); 1301 optbuf = mtod(n, caddr_t) + oldoptlen; 1302 m_freem(mopt); 1303 mopt = exthdrs->ip6e_hbh = n; 1304 } else { 1305 optbuf = mtod(mopt, u_char *) + mopt->m_len; 1306 mopt->m_len += JUMBOOPTLEN; 1307 } 1308 optbuf[0] = IP6OPT_PADN; 1309 optbuf[1] = 1; 1310 1311 /* 1312 * Adjust the header length according to the pad and 1313 * the jumbo payload option. 1314 */ 1315 hbh = mtod(mopt, struct ip6_hbh *); 1316 hbh->ip6h_len += (JUMBOOPTLEN >> 3); 1317 } 1318 1319 /* fill in the option. */ 1320 optbuf[2] = IP6OPT_JUMBO; 1321 optbuf[3] = 4; 1322 v = (u_int32_t)htonl(plen + JUMBOOPTLEN); 1323 bcopy(&v, &optbuf[4], sizeof(u_int32_t)); 1324 1325 /* finally, adjust the packet header length */ 1326 exthdrs->ip6e_ip6->m_pkthdr.len += JUMBOOPTLEN; 1327 1328 return (0); 1329 #undef JUMBOOPTLEN 1330 } 1331 1332 /* 1333 * Insert fragment header and copy unfragmentable header portions. 1334 */ 1335 static int 1336 ip6_insertfraghdr(struct mbuf *m0, struct mbuf *m, int hlen, 1337 struct ip6_frag **frghdrp) 1338 { 1339 struct mbuf *n, *mlast; 1340 1341 if (hlen > sizeof(struct ip6_hdr)) { 1342 n = m_copym(m0, sizeof(struct ip6_hdr), 1343 hlen - sizeof(struct ip6_hdr), M_DONTWAIT); 1344 if (n == 0) 1345 return (ENOBUFS); 1346 m->m_next = n; 1347 } else 1348 n = m; 1349 1350 /* Search for the last mbuf of unfragmentable part. */ 1351 for (mlast = n; mlast->m_next; mlast = mlast->m_next) 1352 ; 1353 1354 if ((mlast->m_flags & M_EXT) == 0 && 1355 M_TRAILINGSPACE(mlast) >= sizeof(struct ip6_frag)) { 1356 /* use the trailing space of the last mbuf for the fragment hdr */ 1357 *frghdrp = (struct ip6_frag *)(mtod(mlast, caddr_t) + 1358 mlast->m_len); 1359 mlast->m_len += sizeof(struct ip6_frag); 1360 m->m_pkthdr.len += sizeof(struct ip6_frag); 1361 } else { 1362 /* allocate a new mbuf for the fragment header */ 1363 struct mbuf *mfrg; 1364 1365 MGET(mfrg, M_DONTWAIT, MT_DATA); 1366 if (mfrg == 0) 1367 return (ENOBUFS); 1368 mfrg->m_len = sizeof(struct ip6_frag); 1369 *frghdrp = mtod(mfrg, struct ip6_frag *); 1370 mlast->m_next = mfrg; 1371 } 1372 1373 return (0); 1374 } 1375 1376 static int 1377 ip6_getpmtu(struct route_in6 *ro_pmtu, struct route_in6 *ro, 1378 struct ifnet *ifp, struct in6_addr *dst, u_long *mtup, 1379 int *alwaysfragp, u_int fibnum) 1380 { 1381 u_int32_t mtu = 0; 1382 int alwaysfrag = 0; 1383 int error = 0; 1384 1385 if (ro_pmtu != ro) { 1386 /* The first hop and the final destination may differ. */ 1387 struct sockaddr_in6 *sa6_dst = 1388 (struct sockaddr_in6 *)&ro_pmtu->ro_dst; 1389 if (ro_pmtu->ro_rt && 1390 ((ro_pmtu->ro_rt->rt_flags & RTF_UP) == 0 || 1391 !IN6_ARE_ADDR_EQUAL(&sa6_dst->sin6_addr, dst))) { 1392 RTFREE(ro_pmtu->ro_rt); 1393 ro_pmtu->ro_rt = (struct rtentry *)NULL; 1394 } 1395 if (ro_pmtu->ro_rt == NULL) { 1396 bzero(sa6_dst, sizeof(*sa6_dst)); 1397 sa6_dst->sin6_family = AF_INET6; 1398 sa6_dst->sin6_len = sizeof(struct sockaddr_in6); 1399 sa6_dst->sin6_addr = *dst; 1400 1401 in6_rtalloc(ro_pmtu, fibnum); 1402 } 1403 } 1404 if (ro_pmtu->ro_rt) { 1405 u_int32_t ifmtu; 1406 struct in_conninfo inc; 1407 1408 bzero(&inc, sizeof(inc)); 1409 inc.inc_flags |= INC_ISIPV6; 1410 inc.inc6_faddr = *dst; 1411 1412 if (ifp == NULL) 1413 ifp = ro_pmtu->ro_rt->rt_ifp; 1414 ifmtu = IN6_LINKMTU(ifp); 1415 mtu = tcp_hc_getmtu(&inc); 1416 if (mtu) 1417 mtu = min(mtu, ro_pmtu->ro_rt->rt_rmx.rmx_mtu); 1418 else 1419 mtu = ro_pmtu->ro_rt->rt_rmx.rmx_mtu; 1420 if (mtu == 0) 1421 mtu = ifmtu; 1422 else if (mtu < IPV6_MMTU) { 1423 /* 1424 * RFC2460 section 5, last paragraph: 1425 * if we record ICMPv6 too big message with 1426 * mtu < IPV6_MMTU, transmit packets sized IPV6_MMTU 1427 * or smaller, with framgent header attached. 1428 * (fragment header is needed regardless from the 1429 * packet size, for translators to identify packets) 1430 */ 1431 alwaysfrag = 1; 1432 mtu = IPV6_MMTU; 1433 } else if (mtu > ifmtu) { 1434 /* 1435 * The MTU on the route is larger than the MTU on 1436 * the interface! This shouldn't happen, unless the 1437 * MTU of the interface has been changed after the 1438 * interface was brought up. Change the MTU in the 1439 * route to match the interface MTU (as long as the 1440 * field isn't locked). 1441 */ 1442 mtu = ifmtu; 1443 ro_pmtu->ro_rt->rt_rmx.rmx_mtu = mtu; 1444 } 1445 } else if (ifp) { 1446 mtu = IN6_LINKMTU(ifp); 1447 } else 1448 error = EHOSTUNREACH; /* XXX */ 1449 1450 *mtup = mtu; 1451 if (alwaysfragp) 1452 *alwaysfragp = alwaysfrag; 1453 return (error); 1454 } 1455 1456 /* 1457 * IP6 socket option processing. 1458 */ 1459 int 1460 ip6_ctloutput(struct socket *so, struct sockopt *sopt) 1461 { 1462 int optdatalen, uproto; 1463 void *optdata; 1464 struct inpcb *in6p = sotoinpcb(so); 1465 int error, optval; 1466 int level, op, optname; 1467 int optlen; 1468 struct thread *td; 1469 1470 level = sopt->sopt_level; 1471 op = sopt->sopt_dir; 1472 optname = sopt->sopt_name; 1473 optlen = sopt->sopt_valsize; 1474 td = sopt->sopt_td; 1475 error = 0; 1476 optval = 0; 1477 uproto = (int)so->so_proto->pr_protocol; 1478 1479 if (level != IPPROTO_IPV6) { 1480 error = EINVAL; 1481 1482 if (sopt->sopt_level == SOL_SOCKET && 1483 sopt->sopt_dir == SOPT_SET) { 1484 switch (sopt->sopt_name) { 1485 case SO_REUSEADDR: 1486 INP_WLOCK(in6p); 1487 if ((so->so_options & SO_REUSEADDR) != 0) 1488 in6p->inp_flags2 |= INP_REUSEADDR; 1489 else 1490 in6p->inp_flags2 &= ~INP_REUSEADDR; 1491 INP_WUNLOCK(in6p); 1492 error = 0; 1493 break; 1494 case SO_REUSEPORT: 1495 INP_WLOCK(in6p); 1496 if ((so->so_options & SO_REUSEPORT) != 0) 1497 in6p->inp_flags2 |= INP_REUSEPORT; 1498 else 1499 in6p->inp_flags2 &= ~INP_REUSEPORT; 1500 INP_WUNLOCK(in6p); 1501 error = 0; 1502 break; 1503 case SO_SETFIB: 1504 INP_WLOCK(in6p); 1505 in6p->inp_inc.inc_fibnum = so->so_fibnum; 1506 INP_WUNLOCK(in6p); 1507 error = 0; 1508 break; 1509 default: 1510 break; 1511 } 1512 } 1513 } else { /* level == IPPROTO_IPV6 */ 1514 switch (op) { 1515 1516 case SOPT_SET: 1517 switch (optname) { 1518 case IPV6_2292PKTOPTIONS: 1519 #ifdef IPV6_PKTOPTIONS 1520 case IPV6_PKTOPTIONS: 1521 #endif 1522 { 1523 struct mbuf *m; 1524 1525 error = soopt_getm(sopt, &m); /* XXX */ 1526 if (error != 0) 1527 break; 1528 error = soopt_mcopyin(sopt, m); /* XXX */ 1529 if (error != 0) 1530 break; 1531 error = ip6_pcbopts(&in6p->in6p_outputopts, 1532 m, so, sopt); 1533 m_freem(m); /* XXX */ 1534 break; 1535 } 1536 1537 /* 1538 * Use of some Hop-by-Hop options or some 1539 * Destination options, might require special 1540 * privilege. That is, normal applications 1541 * (without special privilege) might be forbidden 1542 * from setting certain options in outgoing packets, 1543 * and might never see certain options in received 1544 * packets. [RFC 2292 Section 6] 1545 * KAME specific note: 1546 * KAME prevents non-privileged users from sending or 1547 * receiving ANY hbh/dst options in order to avoid 1548 * overhead of parsing options in the kernel. 1549 */ 1550 case IPV6_RECVHOPOPTS: 1551 case IPV6_RECVDSTOPTS: 1552 case IPV6_RECVRTHDRDSTOPTS: 1553 if (td != NULL) { 1554 error = priv_check(td, 1555 PRIV_NETINET_SETHDROPTS); 1556 if (error) 1557 break; 1558 } 1559 /* FALLTHROUGH */ 1560 case IPV6_UNICAST_HOPS: 1561 case IPV6_HOPLIMIT: 1562 case IPV6_FAITH: 1563 1564 case IPV6_RECVPKTINFO: 1565 case IPV6_RECVHOPLIMIT: 1566 case IPV6_RECVRTHDR: 1567 case IPV6_RECVPATHMTU: 1568 case IPV6_RECVTCLASS: 1569 case IPV6_V6ONLY: 1570 case IPV6_AUTOFLOWLABEL: 1571 case IPV6_BINDANY: 1572 if (optname == IPV6_BINDANY && td != NULL) { 1573 error = priv_check(td, 1574 PRIV_NETINET_BINDANY); 1575 if (error) 1576 break; 1577 } 1578 1579 if (optlen != sizeof(int)) { 1580 error = EINVAL; 1581 break; 1582 } 1583 error = sooptcopyin(sopt, &optval, 1584 sizeof optval, sizeof optval); 1585 if (error) 1586 break; 1587 switch (optname) { 1588 1589 case IPV6_UNICAST_HOPS: 1590 if (optval < -1 || optval >= 256) 1591 error = EINVAL; 1592 else { 1593 /* -1 = kernel default */ 1594 in6p->in6p_hops = optval; 1595 if ((in6p->inp_vflag & 1596 INP_IPV4) != 0) 1597 in6p->inp_ip_ttl = optval; 1598 } 1599 break; 1600 #define OPTSET(bit) \ 1601 do { \ 1602 INP_WLOCK(in6p); \ 1603 if (optval) \ 1604 in6p->inp_flags |= (bit); \ 1605 else \ 1606 in6p->inp_flags &= ~(bit); \ 1607 INP_WUNLOCK(in6p); \ 1608 } while (/*CONSTCOND*/ 0) 1609 #define OPTSET2292(bit) \ 1610 do { \ 1611 INP_WLOCK(in6p); \ 1612 in6p->inp_flags |= IN6P_RFC2292; \ 1613 if (optval) \ 1614 in6p->inp_flags |= (bit); \ 1615 else \ 1616 in6p->inp_flags &= ~(bit); \ 1617 INP_WUNLOCK(in6p); \ 1618 } while (/*CONSTCOND*/ 0) 1619 #define OPTBIT(bit) (in6p->inp_flags & (bit) ? 1 : 0) 1620 1621 case IPV6_RECVPKTINFO: 1622 /* cannot mix with RFC2292 */ 1623 if (OPTBIT(IN6P_RFC2292)) { 1624 error = EINVAL; 1625 break; 1626 } 1627 OPTSET(IN6P_PKTINFO); 1628 break; 1629 1630 case IPV6_HOPLIMIT: 1631 { 1632 struct ip6_pktopts **optp; 1633 1634 /* cannot mix with RFC2292 */ 1635 if (OPTBIT(IN6P_RFC2292)) { 1636 error = EINVAL; 1637 break; 1638 } 1639 optp = &in6p->in6p_outputopts; 1640 error = ip6_pcbopt(IPV6_HOPLIMIT, 1641 (u_char *)&optval, sizeof(optval), 1642 optp, (td != NULL) ? td->td_ucred : 1643 NULL, uproto); 1644 break; 1645 } 1646 1647 case IPV6_RECVHOPLIMIT: 1648 /* cannot mix with RFC2292 */ 1649 if (OPTBIT(IN6P_RFC2292)) { 1650 error = EINVAL; 1651 break; 1652 } 1653 OPTSET(IN6P_HOPLIMIT); 1654 break; 1655 1656 case IPV6_RECVHOPOPTS: 1657 /* cannot mix with RFC2292 */ 1658 if (OPTBIT(IN6P_RFC2292)) { 1659 error = EINVAL; 1660 break; 1661 } 1662 OPTSET(IN6P_HOPOPTS); 1663 break; 1664 1665 case IPV6_RECVDSTOPTS: 1666 /* cannot mix with RFC2292 */ 1667 if (OPTBIT(IN6P_RFC2292)) { 1668 error = EINVAL; 1669 break; 1670 } 1671 OPTSET(IN6P_DSTOPTS); 1672 break; 1673 1674 case IPV6_RECVRTHDRDSTOPTS: 1675 /* cannot mix with RFC2292 */ 1676 if (OPTBIT(IN6P_RFC2292)) { 1677 error = EINVAL; 1678 break; 1679 } 1680 OPTSET(IN6P_RTHDRDSTOPTS); 1681 break; 1682 1683 case IPV6_RECVRTHDR: 1684 /* cannot mix with RFC2292 */ 1685 if (OPTBIT(IN6P_RFC2292)) { 1686 error = EINVAL; 1687 break; 1688 } 1689 OPTSET(IN6P_RTHDR); 1690 break; 1691 1692 case IPV6_FAITH: 1693 OPTSET(INP_FAITH); 1694 break; 1695 1696 case IPV6_RECVPATHMTU: 1697 /* 1698 * We ignore this option for TCP 1699 * sockets. 1700 * (RFC3542 leaves this case 1701 * unspecified.) 1702 */ 1703 if (uproto != IPPROTO_TCP) 1704 OPTSET(IN6P_MTU); 1705 break; 1706 1707 case IPV6_V6ONLY: 1708 /* 1709 * make setsockopt(IPV6_V6ONLY) 1710 * available only prior to bind(2). 1711 * see ipng mailing list, Jun 22 2001. 1712 */ 1713 if (in6p->inp_lport || 1714 !IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) { 1715 error = EINVAL; 1716 break; 1717 } 1718 OPTSET(IN6P_IPV6_V6ONLY); 1719 if (optval) 1720 in6p->inp_vflag &= ~INP_IPV4; 1721 else 1722 in6p->inp_vflag |= INP_IPV4; 1723 break; 1724 case IPV6_RECVTCLASS: 1725 /* cannot mix with RFC2292 XXX */ 1726 if (OPTBIT(IN6P_RFC2292)) { 1727 error = EINVAL; 1728 break; 1729 } 1730 OPTSET(IN6P_TCLASS); 1731 break; 1732 case IPV6_AUTOFLOWLABEL: 1733 OPTSET(IN6P_AUTOFLOWLABEL); 1734 break; 1735 1736 case IPV6_BINDANY: 1737 OPTSET(INP_BINDANY); 1738 break; 1739 } 1740 break; 1741 1742 case IPV6_TCLASS: 1743 case IPV6_DONTFRAG: 1744 case IPV6_USE_MIN_MTU: 1745 case IPV6_PREFER_TEMPADDR: 1746 if (optlen != sizeof(optval)) { 1747 error = EINVAL; 1748 break; 1749 } 1750 error = sooptcopyin(sopt, &optval, 1751 sizeof optval, sizeof optval); 1752 if (error) 1753 break; 1754 { 1755 struct ip6_pktopts **optp; 1756 optp = &in6p->in6p_outputopts; 1757 error = ip6_pcbopt(optname, 1758 (u_char *)&optval, sizeof(optval), 1759 optp, (td != NULL) ? td->td_ucred : 1760 NULL, uproto); 1761 break; 1762 } 1763 1764 case IPV6_2292PKTINFO: 1765 case IPV6_2292HOPLIMIT: 1766 case IPV6_2292HOPOPTS: 1767 case IPV6_2292DSTOPTS: 1768 case IPV6_2292RTHDR: 1769 /* RFC 2292 */ 1770 if (optlen != sizeof(int)) { 1771 error = EINVAL; 1772 break; 1773 } 1774 error = sooptcopyin(sopt, &optval, 1775 sizeof optval, sizeof optval); 1776 if (error) 1777 break; 1778 switch (optname) { 1779 case IPV6_2292PKTINFO: 1780 OPTSET2292(IN6P_PKTINFO); 1781 break; 1782 case IPV6_2292HOPLIMIT: 1783 OPTSET2292(IN6P_HOPLIMIT); 1784 break; 1785 case IPV6_2292HOPOPTS: 1786 /* 1787 * Check super-user privilege. 1788 * See comments for IPV6_RECVHOPOPTS. 1789 */ 1790 if (td != NULL) { 1791 error = priv_check(td, 1792 PRIV_NETINET_SETHDROPTS); 1793 if (error) 1794 return (error); 1795 } 1796 OPTSET2292(IN6P_HOPOPTS); 1797 break; 1798 case IPV6_2292DSTOPTS: 1799 if (td != NULL) { 1800 error = priv_check(td, 1801 PRIV_NETINET_SETHDROPTS); 1802 if (error) 1803 return (error); 1804 } 1805 OPTSET2292(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); /* XXX */ 1806 break; 1807 case IPV6_2292RTHDR: 1808 OPTSET2292(IN6P_RTHDR); 1809 break; 1810 } 1811 break; 1812 case IPV6_PKTINFO: 1813 case IPV6_HOPOPTS: 1814 case IPV6_RTHDR: 1815 case IPV6_DSTOPTS: 1816 case IPV6_RTHDRDSTOPTS: 1817 case IPV6_NEXTHOP: 1818 { 1819 /* new advanced API (RFC3542) */ 1820 u_char *optbuf; 1821 u_char optbuf_storage[MCLBYTES]; 1822 int optlen; 1823 struct ip6_pktopts **optp; 1824 1825 /* cannot mix with RFC2292 */ 1826 if (OPTBIT(IN6P_RFC2292)) { 1827 error = EINVAL; 1828 break; 1829 } 1830 1831 /* 1832 * We only ensure valsize is not too large 1833 * here. Further validation will be done 1834 * later. 1835 */ 1836 error = sooptcopyin(sopt, optbuf_storage, 1837 sizeof(optbuf_storage), 0); 1838 if (error) 1839 break; 1840 optlen = sopt->sopt_valsize; 1841 optbuf = optbuf_storage; 1842 optp = &in6p->in6p_outputopts; 1843 error = ip6_pcbopt(optname, optbuf, optlen, 1844 optp, (td != NULL) ? td->td_ucred : NULL, 1845 uproto); 1846 break; 1847 } 1848 #undef OPTSET 1849 1850 case IPV6_MULTICAST_IF: 1851 case IPV6_MULTICAST_HOPS: 1852 case IPV6_MULTICAST_LOOP: 1853 case IPV6_JOIN_GROUP: 1854 case IPV6_LEAVE_GROUP: 1855 case IPV6_MSFILTER: 1856 case MCAST_BLOCK_SOURCE: 1857 case MCAST_UNBLOCK_SOURCE: 1858 case MCAST_JOIN_GROUP: 1859 case MCAST_LEAVE_GROUP: 1860 case MCAST_JOIN_SOURCE_GROUP: 1861 case MCAST_LEAVE_SOURCE_GROUP: 1862 error = ip6_setmoptions(in6p, sopt); 1863 break; 1864 1865 case IPV6_PORTRANGE: 1866 error = sooptcopyin(sopt, &optval, 1867 sizeof optval, sizeof optval); 1868 if (error) 1869 break; 1870 1871 INP_WLOCK(in6p); 1872 switch (optval) { 1873 case IPV6_PORTRANGE_DEFAULT: 1874 in6p->inp_flags &= ~(INP_LOWPORT); 1875 in6p->inp_flags &= ~(INP_HIGHPORT); 1876 break; 1877 1878 case IPV6_PORTRANGE_HIGH: 1879 in6p->inp_flags &= ~(INP_LOWPORT); 1880 in6p->inp_flags |= INP_HIGHPORT; 1881 break; 1882 1883 case IPV6_PORTRANGE_LOW: 1884 in6p->inp_flags &= ~(INP_HIGHPORT); 1885 in6p->inp_flags |= INP_LOWPORT; 1886 break; 1887 1888 default: 1889 error = EINVAL; 1890 break; 1891 } 1892 INP_WUNLOCK(in6p); 1893 break; 1894 1895 #ifdef IPSEC 1896 case IPV6_IPSEC_POLICY: 1897 { 1898 caddr_t req; 1899 struct mbuf *m; 1900 1901 if ((error = soopt_getm(sopt, &m)) != 0) /* XXX */ 1902 break; 1903 if ((error = soopt_mcopyin(sopt, m)) != 0) /* XXX */ 1904 break; 1905 req = mtod(m, caddr_t); 1906 error = ipsec_set_policy(in6p, optname, req, 1907 m->m_len, (sopt->sopt_td != NULL) ? 1908 sopt->sopt_td->td_ucred : NULL); 1909 m_freem(m); 1910 break; 1911 } 1912 #endif /* IPSEC */ 1913 1914 default: 1915 error = ENOPROTOOPT; 1916 break; 1917 } 1918 break; 1919 1920 case SOPT_GET: 1921 switch (optname) { 1922 1923 case IPV6_2292PKTOPTIONS: 1924 #ifdef IPV6_PKTOPTIONS 1925 case IPV6_PKTOPTIONS: 1926 #endif 1927 /* 1928 * RFC3542 (effectively) deprecated the 1929 * semantics of the 2292-style pktoptions. 1930 * Since it was not reliable in nature (i.e., 1931 * applications had to expect the lack of some 1932 * information after all), it would make sense 1933 * to simplify this part by always returning 1934 * empty data. 1935 */ 1936 sopt->sopt_valsize = 0; 1937 break; 1938 1939 case IPV6_RECVHOPOPTS: 1940 case IPV6_RECVDSTOPTS: 1941 case IPV6_RECVRTHDRDSTOPTS: 1942 case IPV6_UNICAST_HOPS: 1943 case IPV6_RECVPKTINFO: 1944 case IPV6_RECVHOPLIMIT: 1945 case IPV6_RECVRTHDR: 1946 case IPV6_RECVPATHMTU: 1947 1948 case IPV6_FAITH: 1949 case IPV6_V6ONLY: 1950 case IPV6_PORTRANGE: 1951 case IPV6_RECVTCLASS: 1952 case IPV6_AUTOFLOWLABEL: 1953 case IPV6_BINDANY: 1954 switch (optname) { 1955 1956 case IPV6_RECVHOPOPTS: 1957 optval = OPTBIT(IN6P_HOPOPTS); 1958 break; 1959 1960 case IPV6_RECVDSTOPTS: 1961 optval = OPTBIT(IN6P_DSTOPTS); 1962 break; 1963 1964 case IPV6_RECVRTHDRDSTOPTS: 1965 optval = OPTBIT(IN6P_RTHDRDSTOPTS); 1966 break; 1967 1968 case IPV6_UNICAST_HOPS: 1969 optval = in6p->in6p_hops; 1970 break; 1971 1972 case IPV6_RECVPKTINFO: 1973 optval = OPTBIT(IN6P_PKTINFO); 1974 break; 1975 1976 case IPV6_RECVHOPLIMIT: 1977 optval = OPTBIT(IN6P_HOPLIMIT); 1978 break; 1979 1980 case IPV6_RECVRTHDR: 1981 optval = OPTBIT(IN6P_RTHDR); 1982 break; 1983 1984 case IPV6_RECVPATHMTU: 1985 optval = OPTBIT(IN6P_MTU); 1986 break; 1987 1988 case IPV6_FAITH: 1989 optval = OPTBIT(INP_FAITH); 1990 break; 1991 1992 case IPV6_V6ONLY: 1993 optval = OPTBIT(IN6P_IPV6_V6ONLY); 1994 break; 1995 1996 case IPV6_PORTRANGE: 1997 { 1998 int flags; 1999 flags = in6p->inp_flags; 2000 if (flags & INP_HIGHPORT) 2001 optval = IPV6_PORTRANGE_HIGH; 2002 else if (flags & INP_LOWPORT) 2003 optval = IPV6_PORTRANGE_LOW; 2004 else 2005 optval = 0; 2006 break; 2007 } 2008 case IPV6_RECVTCLASS: 2009 optval = OPTBIT(IN6P_TCLASS); 2010 break; 2011 2012 case IPV6_AUTOFLOWLABEL: 2013 optval = OPTBIT(IN6P_AUTOFLOWLABEL); 2014 break; 2015 2016 case IPV6_BINDANY: 2017 optval = OPTBIT(INP_BINDANY); 2018 break; 2019 } 2020 if (error) 2021 break; 2022 error = sooptcopyout(sopt, &optval, 2023 sizeof optval); 2024 break; 2025 2026 case IPV6_PATHMTU: 2027 { 2028 u_long pmtu = 0; 2029 struct ip6_mtuinfo mtuinfo; 2030 struct route_in6 sro; 2031 2032 bzero(&sro, sizeof(sro)); 2033 2034 if (!(so->so_state & SS_ISCONNECTED)) 2035 return (ENOTCONN); 2036 /* 2037 * XXX: we dot not consider the case of source 2038 * routing, or optional information to specify 2039 * the outgoing interface. 2040 */ 2041 error = ip6_getpmtu(&sro, NULL, NULL, 2042 &in6p->in6p_faddr, &pmtu, NULL, 2043 so->so_fibnum); 2044 if (sro.ro_rt) 2045 RTFREE(sro.ro_rt); 2046 if (error) 2047 break; 2048 if (pmtu > IPV6_MAXPACKET) 2049 pmtu = IPV6_MAXPACKET; 2050 2051 bzero(&mtuinfo, sizeof(mtuinfo)); 2052 mtuinfo.ip6m_mtu = (u_int32_t)pmtu; 2053 optdata = (void *)&mtuinfo; 2054 optdatalen = sizeof(mtuinfo); 2055 error = sooptcopyout(sopt, optdata, 2056 optdatalen); 2057 break; 2058 } 2059 2060 case IPV6_2292PKTINFO: 2061 case IPV6_2292HOPLIMIT: 2062 case IPV6_2292HOPOPTS: 2063 case IPV6_2292RTHDR: 2064 case IPV6_2292DSTOPTS: 2065 switch (optname) { 2066 case IPV6_2292PKTINFO: 2067 optval = OPTBIT(IN6P_PKTINFO); 2068 break; 2069 case IPV6_2292HOPLIMIT: 2070 optval = OPTBIT(IN6P_HOPLIMIT); 2071 break; 2072 case IPV6_2292HOPOPTS: 2073 optval = OPTBIT(IN6P_HOPOPTS); 2074 break; 2075 case IPV6_2292RTHDR: 2076 optval = OPTBIT(IN6P_RTHDR); 2077 break; 2078 case IPV6_2292DSTOPTS: 2079 optval = OPTBIT(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); 2080 break; 2081 } 2082 error = sooptcopyout(sopt, &optval, 2083 sizeof optval); 2084 break; 2085 case IPV6_PKTINFO: 2086 case IPV6_HOPOPTS: 2087 case IPV6_RTHDR: 2088 case IPV6_DSTOPTS: 2089 case IPV6_RTHDRDSTOPTS: 2090 case IPV6_NEXTHOP: 2091 case IPV6_TCLASS: 2092 case IPV6_DONTFRAG: 2093 case IPV6_USE_MIN_MTU: 2094 case IPV6_PREFER_TEMPADDR: 2095 error = ip6_getpcbopt(in6p->in6p_outputopts, 2096 optname, sopt); 2097 break; 2098 2099 case IPV6_MULTICAST_IF: 2100 case IPV6_MULTICAST_HOPS: 2101 case IPV6_MULTICAST_LOOP: 2102 case IPV6_MSFILTER: 2103 error = ip6_getmoptions(in6p, sopt); 2104 break; 2105 2106 #ifdef IPSEC 2107 case IPV6_IPSEC_POLICY: 2108 { 2109 caddr_t req = NULL; 2110 size_t len = 0; 2111 struct mbuf *m = NULL; 2112 struct mbuf **mp = &m; 2113 size_t ovalsize = sopt->sopt_valsize; 2114 caddr_t oval = (caddr_t)sopt->sopt_val; 2115 2116 error = soopt_getm(sopt, &m); /* XXX */ 2117 if (error != 0) 2118 break; 2119 error = soopt_mcopyin(sopt, m); /* XXX */ 2120 if (error != 0) 2121 break; 2122 sopt->sopt_valsize = ovalsize; 2123 sopt->sopt_val = oval; 2124 if (m) { 2125 req = mtod(m, caddr_t); 2126 len = m->m_len; 2127 } 2128 error = ipsec_get_policy(in6p, req, len, mp); 2129 if (error == 0) 2130 error = soopt_mcopyout(sopt, m); /* XXX */ 2131 if (error == 0 && m) 2132 m_freem(m); 2133 break; 2134 } 2135 #endif /* IPSEC */ 2136 2137 default: 2138 error = ENOPROTOOPT; 2139 break; 2140 } 2141 break; 2142 } 2143 } 2144 return (error); 2145 } 2146 2147 int 2148 ip6_raw_ctloutput(struct socket *so, struct sockopt *sopt) 2149 { 2150 int error = 0, optval, optlen; 2151 const int icmp6off = offsetof(struct icmp6_hdr, icmp6_cksum); 2152 struct inpcb *in6p = sotoinpcb(so); 2153 int level, op, optname; 2154 2155 level = sopt->sopt_level; 2156 op = sopt->sopt_dir; 2157 optname = sopt->sopt_name; 2158 optlen = sopt->sopt_valsize; 2159 2160 if (level != IPPROTO_IPV6) { 2161 return (EINVAL); 2162 } 2163 2164 switch (optname) { 2165 case IPV6_CHECKSUM: 2166 /* 2167 * For ICMPv6 sockets, no modification allowed for checksum 2168 * offset, permit "no change" values to help existing apps. 2169 * 2170 * RFC3542 says: "An attempt to set IPV6_CHECKSUM 2171 * for an ICMPv6 socket will fail." 2172 * The current behavior does not meet RFC3542. 2173 */ 2174 switch (op) { 2175 case SOPT_SET: 2176 if (optlen != sizeof(int)) { 2177 error = EINVAL; 2178 break; 2179 } 2180 error = sooptcopyin(sopt, &optval, sizeof(optval), 2181 sizeof(optval)); 2182 if (error) 2183 break; 2184 if ((optval % 2) != 0) { 2185 /* the API assumes even offset values */ 2186 error = EINVAL; 2187 } else if (so->so_proto->pr_protocol == 2188 IPPROTO_ICMPV6) { 2189 if (optval != icmp6off) 2190 error = EINVAL; 2191 } else 2192 in6p->in6p_cksum = optval; 2193 break; 2194 2195 case SOPT_GET: 2196 if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) 2197 optval = icmp6off; 2198 else 2199 optval = in6p->in6p_cksum; 2200 2201 error = sooptcopyout(sopt, &optval, sizeof(optval)); 2202 break; 2203 2204 default: 2205 error = EINVAL; 2206 break; 2207 } 2208 break; 2209 2210 default: 2211 error = ENOPROTOOPT; 2212 break; 2213 } 2214 2215 return (error); 2216 } 2217 2218 /* 2219 * Set up IP6 options in pcb for insertion in output packets or 2220 * specifying behavior of outgoing packets. 2221 */ 2222 static int 2223 ip6_pcbopts(struct ip6_pktopts **pktopt, struct mbuf *m, 2224 struct socket *so, struct sockopt *sopt) 2225 { 2226 struct ip6_pktopts *opt = *pktopt; 2227 int error = 0; 2228 struct thread *td = sopt->sopt_td; 2229 2230 /* turn off any old options. */ 2231 if (opt) { 2232 #ifdef DIAGNOSTIC 2233 if (opt->ip6po_pktinfo || opt->ip6po_nexthop || 2234 opt->ip6po_hbh || opt->ip6po_dest1 || opt->ip6po_dest2 || 2235 opt->ip6po_rhinfo.ip6po_rhi_rthdr) 2236 printf("ip6_pcbopts: all specified options are cleared.\n"); 2237 #endif 2238 ip6_clearpktopts(opt, -1); 2239 } else 2240 opt = malloc(sizeof(*opt), M_IP6OPT, M_WAITOK); 2241 *pktopt = NULL; 2242 2243 if (!m || m->m_len == 0) { 2244 /* 2245 * Only turning off any previous options, regardless of 2246 * whether the opt is just created or given. 2247 */ 2248 free(opt, M_IP6OPT); 2249 return (0); 2250 } 2251 2252 /* set options specified by user. */ 2253 if ((error = ip6_setpktopts(m, opt, NULL, (td != NULL) ? 2254 td->td_ucred : NULL, so->so_proto->pr_protocol)) != 0) { 2255 ip6_clearpktopts(opt, -1); /* XXX: discard all options */ 2256 free(opt, M_IP6OPT); 2257 return (error); 2258 } 2259 *pktopt = opt; 2260 return (0); 2261 } 2262 2263 /* 2264 * initialize ip6_pktopts. beware that there are non-zero default values in 2265 * the struct. 2266 */ 2267 void 2268 ip6_initpktopts(struct ip6_pktopts *opt) 2269 { 2270 2271 bzero(opt, sizeof(*opt)); 2272 opt->ip6po_hlim = -1; /* -1 means default hop limit */ 2273 opt->ip6po_tclass = -1; /* -1 means default traffic class */ 2274 opt->ip6po_minmtu = IP6PO_MINMTU_MCASTONLY; 2275 opt->ip6po_prefer_tempaddr = IP6PO_TEMPADDR_SYSTEM; 2276 } 2277 2278 static int 2279 ip6_pcbopt(int optname, u_char *buf, int len, struct ip6_pktopts **pktopt, 2280 struct ucred *cred, int uproto) 2281 { 2282 struct ip6_pktopts *opt; 2283 2284 if (*pktopt == NULL) { 2285 *pktopt = malloc(sizeof(struct ip6_pktopts), M_IP6OPT, 2286 M_WAITOK); 2287 ip6_initpktopts(*pktopt); 2288 } 2289 opt = *pktopt; 2290 2291 return (ip6_setpktopt(optname, buf, len, opt, cred, 1, 0, uproto)); 2292 } 2293 2294 static int 2295 ip6_getpcbopt(struct ip6_pktopts *pktopt, int optname, struct sockopt *sopt) 2296 { 2297 void *optdata = NULL; 2298 int optdatalen = 0; 2299 struct ip6_ext *ip6e; 2300 int error = 0; 2301 struct in6_pktinfo null_pktinfo; 2302 int deftclass = 0, on; 2303 int defminmtu = IP6PO_MINMTU_MCASTONLY; 2304 int defpreftemp = IP6PO_TEMPADDR_SYSTEM; 2305 2306 switch (optname) { 2307 case IPV6_PKTINFO: 2308 if (pktopt && pktopt->ip6po_pktinfo) 2309 optdata = (void *)pktopt->ip6po_pktinfo; 2310 else { 2311 /* XXX: we don't have to do this every time... */ 2312 bzero(&null_pktinfo, sizeof(null_pktinfo)); 2313 optdata = (void *)&null_pktinfo; 2314 } 2315 optdatalen = sizeof(struct in6_pktinfo); 2316 break; 2317 case IPV6_TCLASS: 2318 if (pktopt && pktopt->ip6po_tclass >= 0) 2319 optdata = (void *)&pktopt->ip6po_tclass; 2320 else 2321 optdata = (void *)&deftclass; 2322 optdatalen = sizeof(int); 2323 break; 2324 case IPV6_HOPOPTS: 2325 if (pktopt && pktopt->ip6po_hbh) { 2326 optdata = (void *)pktopt->ip6po_hbh; 2327 ip6e = (struct ip6_ext *)pktopt->ip6po_hbh; 2328 optdatalen = (ip6e->ip6e_len + 1) << 3; 2329 } 2330 break; 2331 case IPV6_RTHDR: 2332 if (pktopt && pktopt->ip6po_rthdr) { 2333 optdata = (void *)pktopt->ip6po_rthdr; 2334 ip6e = (struct ip6_ext *)pktopt->ip6po_rthdr; 2335 optdatalen = (ip6e->ip6e_len + 1) << 3; 2336 } 2337 break; 2338 case IPV6_RTHDRDSTOPTS: 2339 if (pktopt && pktopt->ip6po_dest1) { 2340 optdata = (void *)pktopt->ip6po_dest1; 2341 ip6e = (struct ip6_ext *)pktopt->ip6po_dest1; 2342 optdatalen = (ip6e->ip6e_len + 1) << 3; 2343 } 2344 break; 2345 case IPV6_DSTOPTS: 2346 if (pktopt && pktopt->ip6po_dest2) { 2347 optdata = (void *)pktopt->ip6po_dest2; 2348 ip6e = (struct ip6_ext *)pktopt->ip6po_dest2; 2349 optdatalen = (ip6e->ip6e_len + 1) << 3; 2350 } 2351 break; 2352 case IPV6_NEXTHOP: 2353 if (pktopt && pktopt->ip6po_nexthop) { 2354 optdata = (void *)pktopt->ip6po_nexthop; 2355 optdatalen = pktopt->ip6po_nexthop->sa_len; 2356 } 2357 break; 2358 case IPV6_USE_MIN_MTU: 2359 if (pktopt) 2360 optdata = (void *)&pktopt->ip6po_minmtu; 2361 else 2362 optdata = (void *)&defminmtu; 2363 optdatalen = sizeof(int); 2364 break; 2365 case IPV6_DONTFRAG: 2366 if (pktopt && ((pktopt->ip6po_flags) & IP6PO_DONTFRAG)) 2367 on = 1; 2368 else 2369 on = 0; 2370 optdata = (void *)&on; 2371 optdatalen = sizeof(on); 2372 break; 2373 case IPV6_PREFER_TEMPADDR: 2374 if (pktopt) 2375 optdata = (void *)&pktopt->ip6po_prefer_tempaddr; 2376 else 2377 optdata = (void *)&defpreftemp; 2378 optdatalen = sizeof(int); 2379 break; 2380 default: /* should not happen */ 2381 #ifdef DIAGNOSTIC 2382 panic("ip6_getpcbopt: unexpected option\n"); 2383 #endif 2384 return (ENOPROTOOPT); 2385 } 2386 2387 error = sooptcopyout(sopt, optdata, optdatalen); 2388 2389 return (error); 2390 } 2391 2392 void 2393 ip6_clearpktopts(struct ip6_pktopts *pktopt, int optname) 2394 { 2395 if (pktopt == NULL) 2396 return; 2397 2398 if (optname == -1 || optname == IPV6_PKTINFO) { 2399 if (pktopt->ip6po_pktinfo) 2400 free(pktopt->ip6po_pktinfo, M_IP6OPT); 2401 pktopt->ip6po_pktinfo = NULL; 2402 } 2403 if (optname == -1 || optname == IPV6_HOPLIMIT) 2404 pktopt->ip6po_hlim = -1; 2405 if (optname == -1 || optname == IPV6_TCLASS) 2406 pktopt->ip6po_tclass = -1; 2407 if (optname == -1 || optname == IPV6_NEXTHOP) { 2408 if (pktopt->ip6po_nextroute.ro_rt) { 2409 RTFREE(pktopt->ip6po_nextroute.ro_rt); 2410 pktopt->ip6po_nextroute.ro_rt = NULL; 2411 } 2412 if (pktopt->ip6po_nexthop) 2413 free(pktopt->ip6po_nexthop, M_IP6OPT); 2414 pktopt->ip6po_nexthop = NULL; 2415 } 2416 if (optname == -1 || optname == IPV6_HOPOPTS) { 2417 if (pktopt->ip6po_hbh) 2418 free(pktopt->ip6po_hbh, M_IP6OPT); 2419 pktopt->ip6po_hbh = NULL; 2420 } 2421 if (optname == -1 || optname == IPV6_RTHDRDSTOPTS) { 2422 if (pktopt->ip6po_dest1) 2423 free(pktopt->ip6po_dest1, M_IP6OPT); 2424 pktopt->ip6po_dest1 = NULL; 2425 } 2426 if (optname == -1 || optname == IPV6_RTHDR) { 2427 if (pktopt->ip6po_rhinfo.ip6po_rhi_rthdr) 2428 free(pktopt->ip6po_rhinfo.ip6po_rhi_rthdr, M_IP6OPT); 2429 pktopt->ip6po_rhinfo.ip6po_rhi_rthdr = NULL; 2430 if (pktopt->ip6po_route.ro_rt) { 2431 RTFREE(pktopt->ip6po_route.ro_rt); 2432 pktopt->ip6po_route.ro_rt = NULL; 2433 } 2434 } 2435 if (optname == -1 || optname == IPV6_DSTOPTS) { 2436 if (pktopt->ip6po_dest2) 2437 free(pktopt->ip6po_dest2, M_IP6OPT); 2438 pktopt->ip6po_dest2 = NULL; 2439 } 2440 } 2441 2442 #define PKTOPT_EXTHDRCPY(type) \ 2443 do {\ 2444 if (src->type) {\ 2445 int hlen = (((struct ip6_ext *)src->type)->ip6e_len + 1) << 3;\ 2446 dst->type = malloc(hlen, M_IP6OPT, canwait);\ 2447 if (dst->type == NULL && canwait == M_NOWAIT)\ 2448 goto bad;\ 2449 bcopy(src->type, dst->type, hlen);\ 2450 }\ 2451 } while (/*CONSTCOND*/ 0) 2452 2453 static int 2454 copypktopts(struct ip6_pktopts *dst, struct ip6_pktopts *src, int canwait) 2455 { 2456 if (dst == NULL || src == NULL) { 2457 printf("ip6_clearpktopts: invalid argument\n"); 2458 return (EINVAL); 2459 } 2460 2461 dst->ip6po_hlim = src->ip6po_hlim; 2462 dst->ip6po_tclass = src->ip6po_tclass; 2463 dst->ip6po_flags = src->ip6po_flags; 2464 dst->ip6po_minmtu = src->ip6po_minmtu; 2465 dst->ip6po_prefer_tempaddr = src->ip6po_prefer_tempaddr; 2466 if (src->ip6po_pktinfo) { 2467 dst->ip6po_pktinfo = malloc(sizeof(*dst->ip6po_pktinfo), 2468 M_IP6OPT, canwait); 2469 if (dst->ip6po_pktinfo == NULL) 2470 goto bad; 2471 *dst->ip6po_pktinfo = *src->ip6po_pktinfo; 2472 } 2473 if (src->ip6po_nexthop) { 2474 dst->ip6po_nexthop = malloc(src->ip6po_nexthop->sa_len, 2475 M_IP6OPT, canwait); 2476 if (dst->ip6po_nexthop == NULL) 2477 goto bad; 2478 bcopy(src->ip6po_nexthop, dst->ip6po_nexthop, 2479 src->ip6po_nexthop->sa_len); 2480 } 2481 PKTOPT_EXTHDRCPY(ip6po_hbh); 2482 PKTOPT_EXTHDRCPY(ip6po_dest1); 2483 PKTOPT_EXTHDRCPY(ip6po_dest2); 2484 PKTOPT_EXTHDRCPY(ip6po_rthdr); /* not copy the cached route */ 2485 return (0); 2486 2487 bad: 2488 ip6_clearpktopts(dst, -1); 2489 return (ENOBUFS); 2490 } 2491 #undef PKTOPT_EXTHDRCPY 2492 2493 struct ip6_pktopts * 2494 ip6_copypktopts(struct ip6_pktopts *src, int canwait) 2495 { 2496 int error; 2497 struct ip6_pktopts *dst; 2498 2499 dst = malloc(sizeof(*dst), M_IP6OPT, canwait); 2500 if (dst == NULL) 2501 return (NULL); 2502 ip6_initpktopts(dst); 2503 2504 if ((error = copypktopts(dst, src, canwait)) != 0) { 2505 free(dst, M_IP6OPT); 2506 return (NULL); 2507 } 2508 2509 return (dst); 2510 } 2511 2512 void 2513 ip6_freepcbopts(struct ip6_pktopts *pktopt) 2514 { 2515 if (pktopt == NULL) 2516 return; 2517 2518 ip6_clearpktopts(pktopt, -1); 2519 2520 free(pktopt, M_IP6OPT); 2521 } 2522 2523 /* 2524 * Set IPv6 outgoing packet options based on advanced API. 2525 */ 2526 int 2527 ip6_setpktopts(struct mbuf *control, struct ip6_pktopts *opt, 2528 struct ip6_pktopts *stickyopt, struct ucred *cred, int uproto) 2529 { 2530 struct cmsghdr *cm = 0; 2531 2532 if (control == NULL || opt == NULL) 2533 return (EINVAL); 2534 2535 ip6_initpktopts(opt); 2536 if (stickyopt) { 2537 int error; 2538 2539 /* 2540 * If stickyopt is provided, make a local copy of the options 2541 * for this particular packet, then override them by ancillary 2542 * objects. 2543 * XXX: copypktopts() does not copy the cached route to a next 2544 * hop (if any). This is not very good in terms of efficiency, 2545 * but we can allow this since this option should be rarely 2546 * used. 2547 */ 2548 if ((error = copypktopts(opt, stickyopt, M_NOWAIT)) != 0) 2549 return (error); 2550 } 2551 2552 /* 2553 * XXX: Currently, we assume all the optional information is stored 2554 * in a single mbuf. 2555 */ 2556 if (control->m_next) 2557 return (EINVAL); 2558 2559 for (; control->m_len > 0; control->m_data += CMSG_ALIGN(cm->cmsg_len), 2560 control->m_len -= CMSG_ALIGN(cm->cmsg_len)) { 2561 int error; 2562 2563 if (control->m_len < CMSG_LEN(0)) 2564 return (EINVAL); 2565 2566 cm = mtod(control, struct cmsghdr *); 2567 if (cm->cmsg_len == 0 || cm->cmsg_len > control->m_len) 2568 return (EINVAL); 2569 if (cm->cmsg_level != IPPROTO_IPV6) 2570 continue; 2571 2572 error = ip6_setpktopt(cm->cmsg_type, CMSG_DATA(cm), 2573 cm->cmsg_len - CMSG_LEN(0), opt, cred, 0, 1, uproto); 2574 if (error) 2575 return (error); 2576 } 2577 2578 return (0); 2579 } 2580 2581 /* 2582 * Set a particular packet option, as a sticky option or an ancillary data 2583 * item. "len" can be 0 only when it's a sticky option. 2584 * We have 4 cases of combination of "sticky" and "cmsg": 2585 * "sticky=0, cmsg=0": impossible 2586 * "sticky=0, cmsg=1": RFC2292 or RFC3542 ancillary data 2587 * "sticky=1, cmsg=0": RFC3542 socket option 2588 * "sticky=1, cmsg=1": RFC2292 socket option 2589 */ 2590 static int 2591 ip6_setpktopt(int optname, u_char *buf, int len, struct ip6_pktopts *opt, 2592 struct ucred *cred, int sticky, int cmsg, int uproto) 2593 { 2594 int minmtupolicy, preftemp; 2595 int error; 2596 2597 if (!sticky && !cmsg) { 2598 #ifdef DIAGNOSTIC 2599 printf("ip6_setpktopt: impossible case\n"); 2600 #endif 2601 return (EINVAL); 2602 } 2603 2604 /* 2605 * IPV6_2292xxx is for backward compatibility to RFC2292, and should 2606 * not be specified in the context of RFC3542. Conversely, 2607 * RFC3542 types should not be specified in the context of RFC2292. 2608 */ 2609 if (!cmsg) { 2610 switch (optname) { 2611 case IPV6_2292PKTINFO: 2612 case IPV6_2292HOPLIMIT: 2613 case IPV6_2292NEXTHOP: 2614 case IPV6_2292HOPOPTS: 2615 case IPV6_2292DSTOPTS: 2616 case IPV6_2292RTHDR: 2617 case IPV6_2292PKTOPTIONS: 2618 return (ENOPROTOOPT); 2619 } 2620 } 2621 if (sticky && cmsg) { 2622 switch (optname) { 2623 case IPV6_PKTINFO: 2624 case IPV6_HOPLIMIT: 2625 case IPV6_NEXTHOP: 2626 case IPV6_HOPOPTS: 2627 case IPV6_DSTOPTS: 2628 case IPV6_RTHDRDSTOPTS: 2629 case IPV6_RTHDR: 2630 case IPV6_USE_MIN_MTU: 2631 case IPV6_DONTFRAG: 2632 case IPV6_TCLASS: 2633 case IPV6_PREFER_TEMPADDR: /* XXX: not an RFC3542 option */ 2634 return (ENOPROTOOPT); 2635 } 2636 } 2637 2638 switch (optname) { 2639 case IPV6_2292PKTINFO: 2640 case IPV6_PKTINFO: 2641 { 2642 struct ifnet *ifp = NULL; 2643 struct in6_pktinfo *pktinfo; 2644 2645 if (len != sizeof(struct in6_pktinfo)) 2646 return (EINVAL); 2647 2648 pktinfo = (struct in6_pktinfo *)buf; 2649 2650 /* 2651 * An application can clear any sticky IPV6_PKTINFO option by 2652 * doing a "regular" setsockopt with ipi6_addr being 2653 * in6addr_any and ipi6_ifindex being zero. 2654 * [RFC 3542, Section 6] 2655 */ 2656 if (optname == IPV6_PKTINFO && opt->ip6po_pktinfo && 2657 pktinfo->ipi6_ifindex == 0 && 2658 IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) { 2659 ip6_clearpktopts(opt, optname); 2660 break; 2661 } 2662 2663 if (uproto == IPPROTO_TCP && optname == IPV6_PKTINFO && 2664 sticky && !IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) { 2665 return (EINVAL); 2666 } 2667 2668 /* validate the interface index if specified. */ 2669 if (pktinfo->ipi6_ifindex > V_if_index || 2670 pktinfo->ipi6_ifindex < 0) { 2671 return (ENXIO); 2672 } 2673 if (pktinfo->ipi6_ifindex) { 2674 ifp = ifnet_byindex(pktinfo->ipi6_ifindex); 2675 if (ifp == NULL) 2676 return (ENXIO); 2677 } 2678 2679 /* 2680 * We store the address anyway, and let in6_selectsrc() 2681 * validate the specified address. This is because ipi6_addr 2682 * may not have enough information about its scope zone, and 2683 * we may need additional information (such as outgoing 2684 * interface or the scope zone of a destination address) to 2685 * disambiguate the scope. 2686 * XXX: the delay of the validation may confuse the 2687 * application when it is used as a sticky option. 2688 */ 2689 if (opt->ip6po_pktinfo == NULL) { 2690 opt->ip6po_pktinfo = malloc(sizeof(*pktinfo), 2691 M_IP6OPT, M_NOWAIT); 2692 if (opt->ip6po_pktinfo == NULL) 2693 return (ENOBUFS); 2694 } 2695 bcopy(pktinfo, opt->ip6po_pktinfo, sizeof(*pktinfo)); 2696 break; 2697 } 2698 2699 case IPV6_2292HOPLIMIT: 2700 case IPV6_HOPLIMIT: 2701 { 2702 int *hlimp; 2703 2704 /* 2705 * RFC 3542 deprecated the usage of sticky IPV6_HOPLIMIT 2706 * to simplify the ordering among hoplimit options. 2707 */ 2708 if (optname == IPV6_HOPLIMIT && sticky) 2709 return (ENOPROTOOPT); 2710 2711 if (len != sizeof(int)) 2712 return (EINVAL); 2713 hlimp = (int *)buf; 2714 if (*hlimp < -1 || *hlimp > 255) 2715 return (EINVAL); 2716 2717 opt->ip6po_hlim = *hlimp; 2718 break; 2719 } 2720 2721 case IPV6_TCLASS: 2722 { 2723 int tclass; 2724 2725 if (len != sizeof(int)) 2726 return (EINVAL); 2727 tclass = *(int *)buf; 2728 if (tclass < -1 || tclass > 255) 2729 return (EINVAL); 2730 2731 opt->ip6po_tclass = tclass; 2732 break; 2733 } 2734 2735 case IPV6_2292NEXTHOP: 2736 case IPV6_NEXTHOP: 2737 if (cred != NULL) { 2738 error = priv_check_cred(cred, 2739 PRIV_NETINET_SETHDROPTS, 0); 2740 if (error) 2741 return (error); 2742 } 2743 2744 if (len == 0) { /* just remove the option */ 2745 ip6_clearpktopts(opt, IPV6_NEXTHOP); 2746 break; 2747 } 2748 2749 /* check if cmsg_len is large enough for sa_len */ 2750 if (len < sizeof(struct sockaddr) || len < *buf) 2751 return (EINVAL); 2752 2753 switch (((struct sockaddr *)buf)->sa_family) { 2754 case AF_INET6: 2755 { 2756 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)buf; 2757 int error; 2758 2759 if (sa6->sin6_len != sizeof(struct sockaddr_in6)) 2760 return (EINVAL); 2761 2762 if (IN6_IS_ADDR_UNSPECIFIED(&sa6->sin6_addr) || 2763 IN6_IS_ADDR_MULTICAST(&sa6->sin6_addr)) { 2764 return (EINVAL); 2765 } 2766 if ((error = sa6_embedscope(sa6, V_ip6_use_defzone)) 2767 != 0) { 2768 return (error); 2769 } 2770 break; 2771 } 2772 case AF_LINK: /* should eventually be supported */ 2773 default: 2774 return (EAFNOSUPPORT); 2775 } 2776 2777 /* turn off the previous option, then set the new option. */ 2778 ip6_clearpktopts(opt, IPV6_NEXTHOP); 2779 opt->ip6po_nexthop = malloc(*buf, M_IP6OPT, M_NOWAIT); 2780 if (opt->ip6po_nexthop == NULL) 2781 return (ENOBUFS); 2782 bcopy(buf, opt->ip6po_nexthop, *buf); 2783 break; 2784 2785 case IPV6_2292HOPOPTS: 2786 case IPV6_HOPOPTS: 2787 { 2788 struct ip6_hbh *hbh; 2789 int hbhlen; 2790 2791 /* 2792 * XXX: We don't allow a non-privileged user to set ANY HbH 2793 * options, since per-option restriction has too much 2794 * overhead. 2795 */ 2796 if (cred != NULL) { 2797 error = priv_check_cred(cred, 2798 PRIV_NETINET_SETHDROPTS, 0); 2799 if (error) 2800 return (error); 2801 } 2802 2803 if (len == 0) { 2804 ip6_clearpktopts(opt, IPV6_HOPOPTS); 2805 break; /* just remove the option */ 2806 } 2807 2808 /* message length validation */ 2809 if (len < sizeof(struct ip6_hbh)) 2810 return (EINVAL); 2811 hbh = (struct ip6_hbh *)buf; 2812 hbhlen = (hbh->ip6h_len + 1) << 3; 2813 if (len != hbhlen) 2814 return (EINVAL); 2815 2816 /* turn off the previous option, then set the new option. */ 2817 ip6_clearpktopts(opt, IPV6_HOPOPTS); 2818 opt->ip6po_hbh = malloc(hbhlen, M_IP6OPT, M_NOWAIT); 2819 if (opt->ip6po_hbh == NULL) 2820 return (ENOBUFS); 2821 bcopy(hbh, opt->ip6po_hbh, hbhlen); 2822 2823 break; 2824 } 2825 2826 case IPV6_2292DSTOPTS: 2827 case IPV6_DSTOPTS: 2828 case IPV6_RTHDRDSTOPTS: 2829 { 2830 struct ip6_dest *dest, **newdest = NULL; 2831 int destlen; 2832 2833 if (cred != NULL) { /* XXX: see the comment for IPV6_HOPOPTS */ 2834 error = priv_check_cred(cred, 2835 PRIV_NETINET_SETHDROPTS, 0); 2836 if (error) 2837 return (error); 2838 } 2839 2840 if (len == 0) { 2841 ip6_clearpktopts(opt, optname); 2842 break; /* just remove the option */ 2843 } 2844 2845 /* message length validation */ 2846 if (len < sizeof(struct ip6_dest)) 2847 return (EINVAL); 2848 dest = (struct ip6_dest *)buf; 2849 destlen = (dest->ip6d_len + 1) << 3; 2850 if (len != destlen) 2851 return (EINVAL); 2852 2853 /* 2854 * Determine the position that the destination options header 2855 * should be inserted; before or after the routing header. 2856 */ 2857 switch (optname) { 2858 case IPV6_2292DSTOPTS: 2859 /* 2860 * The old advacned API is ambiguous on this point. 2861 * Our approach is to determine the position based 2862 * according to the existence of a routing header. 2863 * Note, however, that this depends on the order of the 2864 * extension headers in the ancillary data; the 1st 2865 * part of the destination options header must appear 2866 * before the routing header in the ancillary data, 2867 * too. 2868 * RFC3542 solved the ambiguity by introducing 2869 * separate ancillary data or option types. 2870 */ 2871 if (opt->ip6po_rthdr == NULL) 2872 newdest = &opt->ip6po_dest1; 2873 else 2874 newdest = &opt->ip6po_dest2; 2875 break; 2876 case IPV6_RTHDRDSTOPTS: 2877 newdest = &opt->ip6po_dest1; 2878 break; 2879 case IPV6_DSTOPTS: 2880 newdest = &opt->ip6po_dest2; 2881 break; 2882 } 2883 2884 /* turn off the previous option, then set the new option. */ 2885 ip6_clearpktopts(opt, optname); 2886 *newdest = malloc(destlen, M_IP6OPT, M_NOWAIT); 2887 if (*newdest == NULL) 2888 return (ENOBUFS); 2889 bcopy(dest, *newdest, destlen); 2890 2891 break; 2892 } 2893 2894 case IPV6_2292RTHDR: 2895 case IPV6_RTHDR: 2896 { 2897 struct ip6_rthdr *rth; 2898 int rthlen; 2899 2900 if (len == 0) { 2901 ip6_clearpktopts(opt, IPV6_RTHDR); 2902 break; /* just remove the option */ 2903 } 2904 2905 /* message length validation */ 2906 if (len < sizeof(struct ip6_rthdr)) 2907 return (EINVAL); 2908 rth = (struct ip6_rthdr *)buf; 2909 rthlen = (rth->ip6r_len + 1) << 3; 2910 if (len != rthlen) 2911 return (EINVAL); 2912 2913 switch (rth->ip6r_type) { 2914 case IPV6_RTHDR_TYPE_0: 2915 if (rth->ip6r_len == 0) /* must contain one addr */ 2916 return (EINVAL); 2917 if (rth->ip6r_len % 2) /* length must be even */ 2918 return (EINVAL); 2919 if (rth->ip6r_len / 2 != rth->ip6r_segleft) 2920 return (EINVAL); 2921 break; 2922 default: 2923 return (EINVAL); /* not supported */ 2924 } 2925 2926 /* turn off the previous option */ 2927 ip6_clearpktopts(opt, IPV6_RTHDR); 2928 opt->ip6po_rthdr = malloc(rthlen, M_IP6OPT, M_NOWAIT); 2929 if (opt->ip6po_rthdr == NULL) 2930 return (ENOBUFS); 2931 bcopy(rth, opt->ip6po_rthdr, rthlen); 2932 2933 break; 2934 } 2935 2936 case IPV6_USE_MIN_MTU: 2937 if (len != sizeof(int)) 2938 return (EINVAL); 2939 minmtupolicy = *(int *)buf; 2940 if (minmtupolicy != IP6PO_MINMTU_MCASTONLY && 2941 minmtupolicy != IP6PO_MINMTU_DISABLE && 2942 minmtupolicy != IP6PO_MINMTU_ALL) { 2943 return (EINVAL); 2944 } 2945 opt->ip6po_minmtu = minmtupolicy; 2946 break; 2947 2948 case IPV6_DONTFRAG: 2949 if (len != sizeof(int)) 2950 return (EINVAL); 2951 2952 if (uproto == IPPROTO_TCP || *(int *)buf == 0) { 2953 /* 2954 * we ignore this option for TCP sockets. 2955 * (RFC3542 leaves this case unspecified.) 2956 */ 2957 opt->ip6po_flags &= ~IP6PO_DONTFRAG; 2958 } else 2959 opt->ip6po_flags |= IP6PO_DONTFRAG; 2960 break; 2961 2962 case IPV6_PREFER_TEMPADDR: 2963 if (len != sizeof(int)) 2964 return (EINVAL); 2965 preftemp = *(int *)buf; 2966 if (preftemp != IP6PO_TEMPADDR_SYSTEM && 2967 preftemp != IP6PO_TEMPADDR_NOTPREFER && 2968 preftemp != IP6PO_TEMPADDR_PREFER) { 2969 return (EINVAL); 2970 } 2971 opt->ip6po_prefer_tempaddr = preftemp; 2972 break; 2973 2974 default: 2975 return (ENOPROTOOPT); 2976 } /* end of switch */ 2977 2978 return (0); 2979 } 2980 2981 /* 2982 * Routine called from ip6_output() to loop back a copy of an IP6 multicast 2983 * packet to the input queue of a specified interface. Note that this 2984 * calls the output routine of the loopback "driver", but with an interface 2985 * pointer that might NOT be &loif -- easier than replicating that code here. 2986 */ 2987 void 2988 ip6_mloopback(struct ifnet *ifp, struct mbuf *m, struct sockaddr_in6 *dst) 2989 { 2990 struct mbuf *copym; 2991 struct ip6_hdr *ip6; 2992 2993 copym = m_copy(m, 0, M_COPYALL); 2994 if (copym == NULL) 2995 return; 2996 2997 /* 2998 * Make sure to deep-copy IPv6 header portion in case the data 2999 * is in an mbuf cluster, so that we can safely override the IPv6 3000 * header portion later. 3001 */ 3002 if ((copym->m_flags & M_EXT) != 0 || 3003 copym->m_len < sizeof(struct ip6_hdr)) { 3004 copym = m_pullup(copym, sizeof(struct ip6_hdr)); 3005 if (copym == NULL) 3006 return; 3007 } 3008 ip6 = mtod(copym, struct ip6_hdr *); 3009 /* 3010 * clear embedded scope identifiers if necessary. 3011 * in6_clearscope will touch the addresses only when necessary. 3012 */ 3013 in6_clearscope(&ip6->ip6_src); 3014 in6_clearscope(&ip6->ip6_dst); 3015 if (copym->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6) { 3016 copym->m_pkthdr.csum_flags |= CSUM_DATA_VALID_IPV6 | 3017 CSUM_PSEUDO_HDR; 3018 copym->m_pkthdr.csum_data = 0xffff; 3019 } 3020 (void)if_simloop(ifp, copym, dst->sin6_family, 0); 3021 } 3022 3023 /* 3024 * Chop IPv6 header off from the payload. 3025 */ 3026 static int 3027 ip6_splithdr(struct mbuf *m, struct ip6_exthdrs *exthdrs) 3028 { 3029 struct mbuf *mh; 3030 struct ip6_hdr *ip6; 3031 3032 ip6 = mtod(m, struct ip6_hdr *); 3033 if (m->m_len > sizeof(*ip6)) { 3034 MGETHDR(mh, M_DONTWAIT, MT_HEADER); 3035 if (mh == 0) { 3036 m_freem(m); 3037 return ENOBUFS; 3038 } 3039 M_MOVE_PKTHDR(mh, m); 3040 MH_ALIGN(mh, sizeof(*ip6)); 3041 m->m_len -= sizeof(*ip6); 3042 m->m_data += sizeof(*ip6); 3043 mh->m_next = m; 3044 m = mh; 3045 m->m_len = sizeof(*ip6); 3046 bcopy((caddr_t)ip6, mtod(m, caddr_t), sizeof(*ip6)); 3047 } 3048 exthdrs->ip6e_ip6 = m; 3049 return 0; 3050 } 3051 3052 /* 3053 * Compute IPv6 extension header length. 3054 */ 3055 int 3056 ip6_optlen(struct inpcb *in6p) 3057 { 3058 int len; 3059 3060 if (!in6p->in6p_outputopts) 3061 return 0; 3062 3063 len = 0; 3064 #define elen(x) \ 3065 (((struct ip6_ext *)(x)) ? (((struct ip6_ext *)(x))->ip6e_len + 1) << 3 : 0) 3066 3067 len += elen(in6p->in6p_outputopts->ip6po_hbh); 3068 if (in6p->in6p_outputopts->ip6po_rthdr) 3069 /* dest1 is valid with rthdr only */ 3070 len += elen(in6p->in6p_outputopts->ip6po_dest1); 3071 len += elen(in6p->in6p_outputopts->ip6po_rthdr); 3072 len += elen(in6p->in6p_outputopts->ip6po_dest2); 3073 return len; 3074 #undef elen 3075 }
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