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_ipsec.h" 69 #include "opt_route.h" 70 71 #include <sys/param.h> 72 #include <sys/kernel.h> 73 #include <sys/malloc.h> 74 #include <sys/mbuf.h> 75 #include <sys/errno.h> 76 #include <sys/priv.h> 77 #include <sys/proc.h> 78 #include <sys/protosw.h> 79 #include <sys/socket.h> 80 #include <sys/socketvar.h> 81 #include <sys/ucred.h> 82 #include <sys/vimage.h> 83 84 #include <net/if.h> 85 #include <net/netisr.h> 86 #include <net/route.h> 87 #include <net/pfil.h> 88 #include <net/vnet.h> 89 90 #include <netinet/in.h> 91 #include <netinet/in_var.h> 92 #include <netinet6/in6_var.h> 93 #include <netinet/ip6.h> 94 #include <netinet/icmp6.h> 95 #include <netinet6/ip6_var.h> 96 #include <netinet/in_pcb.h> 97 #include <netinet/tcp_var.h> 98 #include <netinet6/nd6.h> 99 #include <netinet/vinet.h> 100 101 #ifdef IPSEC 102 #include <netipsec/ipsec.h> 103 #include <netipsec/ipsec6.h> 104 #include <netipsec/key.h> 105 #include <netinet6/ip6_ipsec.h> 106 #endif /* IPSEC */ 107 108 #include <netinet6/ip6protosw.h> 109 #include <netinet6/scope6_var.h> 110 #include <netinet6/vinet6.h> 111 112 static MALLOC_DEFINE(M_IP6MOPTS, "ip6_moptions", "internet multicast options"); 113 114 struct ip6_exthdrs { 115 struct mbuf *ip6e_ip6; 116 struct mbuf *ip6e_hbh; 117 struct mbuf *ip6e_dest1; 118 struct mbuf *ip6e_rthdr; 119 struct mbuf *ip6e_dest2; 120 }; 121 122 static int ip6_pcbopt __P((int, u_char *, int, struct ip6_pktopts **, 123 struct ucred *, int)); 124 static int ip6_pcbopts __P((struct ip6_pktopts **, struct mbuf *, 125 struct socket *, struct sockopt *)); 126 static int ip6_getpcbopt(struct ip6_pktopts *, int, struct sockopt *); 127 static int ip6_setpktopt __P((int, u_char *, int, struct ip6_pktopts *, 128 struct ucred *, int, int, int)); 129 130 static int ip6_setmoptions(int, struct ip6_moptions **, struct mbuf *); 131 static int ip6_getmoptions(int, struct ip6_moptions *, struct mbuf **); 132 static int ip6_copyexthdr(struct mbuf **, caddr_t, int); 133 static int ip6_insertfraghdr __P((struct mbuf *, struct mbuf *, int, 134 struct ip6_frag **)); 135 static int ip6_insert_jumboopt(struct ip6_exthdrs *, u_int32_t); 136 static int ip6_splithdr(struct mbuf *, struct ip6_exthdrs *); 137 static int ip6_getpmtu __P((struct route_in6 *, struct route_in6 *, 138 struct ifnet *, struct in6_addr *, u_long *, int *)); 139 static int copypktopts(struct ip6_pktopts *, struct ip6_pktopts *, int); 140 141 142 /* 143 * Make an extension header from option data. hp is the source, and 144 * mp is the destination. 145 */ 146 #define MAKE_EXTHDR(hp, mp) \ 147 do { \ 148 if (hp) { \ 149 struct ip6_ext *eh = (struct ip6_ext *)(hp); \ 150 error = ip6_copyexthdr((mp), (caddr_t)(hp), \ 151 ((eh)->ip6e_len + 1) << 3); \ 152 if (error) \ 153 goto freehdrs; \ 154 } \ 155 } while (/*CONSTCOND*/ 0) 156 157 /* 158 * Form a chain of extension headers. 159 * m is the extension header mbuf 160 * mp is the previous mbuf in the chain 161 * p is the next header 162 * i is the type of option. 163 */ 164 #define MAKE_CHAIN(m, mp, p, i)\ 165 do {\ 166 if (m) {\ 167 if (!hdrsplit) \ 168 panic("assumption failed: hdr not split"); \ 169 *mtod((m), u_char *) = *(p);\ 170 *(p) = (i);\ 171 p = mtod((m), u_char *);\ 172 (m)->m_next = (mp)->m_next;\ 173 (mp)->m_next = (m);\ 174 (mp) = (m);\ 175 }\ 176 } while (/*CONSTCOND*/ 0) 177 178 /* 179 * IP6 output. The packet in mbuf chain m contains a skeletal IP6 180 * header (with pri, len, nxt, hlim, src, dst). 181 * This function may modify ver and hlim only. 182 * The mbuf chain containing the packet will be freed. 183 * The mbuf opt, if present, will not be freed. 184 * 185 * type of "mtu": rt_rmx.rmx_mtu is u_long, ifnet.ifr_mtu is int, and 186 * nd_ifinfo.linkmtu is u_int32_t. so we use u_long to hold largest one, 187 * which is rt_rmx.rmx_mtu. 188 * 189 * ifpp - XXX: just for statistics 190 */ 191 int 192 ip6_output(struct mbuf *m0, struct ip6_pktopts *opt, 193 struct route_in6 *ro, int flags, struct ip6_moptions *im6o, 194 struct ifnet **ifpp, struct inpcb *inp) 195 { 196 INIT_VNET_NET(curvnet); 197 INIT_VNET_INET6(curvnet); 198 struct ip6_hdr *ip6, *mhip6; 199 struct ifnet *ifp, *origifp; 200 struct mbuf *m = m0; 201 struct mbuf *mprev = NULL; 202 int hlen, tlen, len, off; 203 struct route_in6 ip6route; 204 struct rtentry *rt = NULL; 205 struct sockaddr_in6 *dst, src_sa, dst_sa; 206 struct in6_addr odst; 207 int error = 0; 208 struct in6_ifaddr *ia = NULL; 209 u_long mtu; 210 int alwaysfrag, dontfrag; 211 u_int32_t optlen = 0, plen = 0, unfragpartlen = 0; 212 struct ip6_exthdrs exthdrs; 213 struct in6_addr finaldst, src0, dst0; 214 u_int32_t zone; 215 struct route_in6 *ro_pmtu = NULL; 216 int hdrsplit = 0; 217 int needipsec = 0; 218 #ifdef IPSEC 219 struct ipsec_output_state state; 220 struct ip6_rthdr *rh = NULL; 221 int needipsectun = 0; 222 int segleft_org = 0; 223 struct secpolicy *sp = NULL; 224 #endif /* IPSEC */ 225 226 ip6 = mtod(m, struct ip6_hdr *); 227 if (ip6 == NULL) { 228 printf ("ip6 is NULL"); 229 goto bad; 230 } 231 232 finaldst = ip6->ip6_dst; 233 234 bzero(&exthdrs, sizeof(exthdrs)); 235 236 if (opt) { 237 /* Hop-by-Hop options header */ 238 MAKE_EXTHDR(opt->ip6po_hbh, &exthdrs.ip6e_hbh); 239 /* Destination options header(1st part) */ 240 if (opt->ip6po_rthdr) { 241 /* 242 * Destination options header(1st part) 243 * This only makes sense with a routing header. 244 * See Section 9.2 of RFC 3542. 245 * Disabling this part just for MIP6 convenience is 246 * a bad idea. We need to think carefully about a 247 * way to make the advanced API coexist with MIP6 248 * options, which might automatically be inserted in 249 * the kernel. 250 */ 251 MAKE_EXTHDR(opt->ip6po_dest1, &exthdrs.ip6e_dest1); 252 } 253 /* Routing header */ 254 MAKE_EXTHDR(opt->ip6po_rthdr, &exthdrs.ip6e_rthdr); 255 /* Destination options header(2nd part) */ 256 MAKE_EXTHDR(opt->ip6po_dest2, &exthdrs.ip6e_dest2); 257 } 258 259 /* 260 * IPSec checking which handles several cases. 261 * FAST IPSEC: We re-injected the packet. 262 */ 263 #ifdef IPSEC 264 switch(ip6_ipsec_output(&m, inp, &flags, &error, &ifp, &sp)) 265 { 266 case 1: /* Bad packet */ 267 goto freehdrs; 268 case -1: /* Do IPSec */ 269 needipsec = 1; 270 case 0: /* No IPSec */ 271 default: 272 break; 273 } 274 #endif /* IPSEC */ 275 276 /* 277 * Calculate the total length of the extension header chain. 278 * Keep the length of the unfragmentable part for fragmentation. 279 */ 280 optlen = 0; 281 if (exthdrs.ip6e_hbh) 282 optlen += exthdrs.ip6e_hbh->m_len; 283 if (exthdrs.ip6e_dest1) 284 optlen += exthdrs.ip6e_dest1->m_len; 285 if (exthdrs.ip6e_rthdr) 286 optlen += exthdrs.ip6e_rthdr->m_len; 287 unfragpartlen = optlen + sizeof(struct ip6_hdr); 288 289 /* NOTE: we don't add AH/ESP length here. do that later. */ 290 if (exthdrs.ip6e_dest2) 291 optlen += exthdrs.ip6e_dest2->m_len; 292 293 /* 294 * If we need IPsec, or there is at least one extension header, 295 * separate IP6 header from the payload. 296 */ 297 if ((needipsec || optlen) && !hdrsplit) { 298 if ((error = ip6_splithdr(m, &exthdrs)) != 0) { 299 m = NULL; 300 goto freehdrs; 301 } 302 m = exthdrs.ip6e_ip6; 303 hdrsplit++; 304 } 305 306 /* adjust pointer */ 307 ip6 = mtod(m, struct ip6_hdr *); 308 309 /* adjust mbuf packet header length */ 310 m->m_pkthdr.len += optlen; 311 plen = m->m_pkthdr.len - sizeof(*ip6); 312 313 /* If this is a jumbo payload, insert a jumbo payload option. */ 314 if (plen > IPV6_MAXPACKET) { 315 if (!hdrsplit) { 316 if ((error = ip6_splithdr(m, &exthdrs)) != 0) { 317 m = NULL; 318 goto freehdrs; 319 } 320 m = exthdrs.ip6e_ip6; 321 hdrsplit++; 322 } 323 /* adjust pointer */ 324 ip6 = mtod(m, struct ip6_hdr *); 325 if ((error = ip6_insert_jumboopt(&exthdrs, plen)) != 0) 326 goto freehdrs; 327 ip6->ip6_plen = 0; 328 } else 329 ip6->ip6_plen = htons(plen); 330 331 /* 332 * Concatenate headers and fill in next header fields. 333 * Here we have, on "m" 334 * IPv6 payload 335 * and we insert headers accordingly. Finally, we should be getting: 336 * IPv6 hbh dest1 rthdr ah* [esp* dest2 payload] 337 * 338 * during the header composing process, "m" points to IPv6 header. 339 * "mprev" points to an extension header prior to esp. 340 */ 341 u_char *nexthdrp = &ip6->ip6_nxt; 342 mprev = m; 343 344 /* 345 * we treat dest2 specially. this makes IPsec processing 346 * much easier. the goal here is to make mprev point the 347 * mbuf prior to dest2. 348 * 349 * result: IPv6 dest2 payload 350 * m and mprev will point to IPv6 header. 351 */ 352 if (exthdrs.ip6e_dest2) { 353 if (!hdrsplit) 354 panic("assumption failed: hdr not split"); 355 exthdrs.ip6e_dest2->m_next = m->m_next; 356 m->m_next = exthdrs.ip6e_dest2; 357 *mtod(exthdrs.ip6e_dest2, u_char *) = ip6->ip6_nxt; 358 ip6->ip6_nxt = IPPROTO_DSTOPTS; 359 } 360 361 /* 362 * result: IPv6 hbh dest1 rthdr dest2 payload 363 * m will point to IPv6 header. mprev will point to the 364 * extension header prior to dest2 (rthdr in the above case). 365 */ 366 MAKE_CHAIN(exthdrs.ip6e_hbh, mprev, nexthdrp, IPPROTO_HOPOPTS); 367 MAKE_CHAIN(exthdrs.ip6e_dest1, mprev, nexthdrp, 368 IPPROTO_DSTOPTS); 369 MAKE_CHAIN(exthdrs.ip6e_rthdr, mprev, nexthdrp, 370 IPPROTO_ROUTING); 371 372 #ifdef IPSEC 373 if (!needipsec) 374 goto skip_ipsec2; 375 376 /* 377 * pointers after IPsec headers are not valid any more. 378 * other pointers need a great care too. 379 * (IPsec routines should not mangle mbufs prior to AH/ESP) 380 */ 381 exthdrs.ip6e_dest2 = NULL; 382 383 if (exthdrs.ip6e_rthdr) { 384 rh = mtod(exthdrs.ip6e_rthdr, struct ip6_rthdr *); 385 segleft_org = rh->ip6r_segleft; 386 rh->ip6r_segleft = 0; 387 } 388 389 bzero(&state, sizeof(state)); 390 state.m = m; 391 error = ipsec6_output_trans(&state, nexthdrp, mprev, sp, flags, 392 &needipsectun); 393 m = state.m; 394 if (error == EJUSTRETURN) { 395 /* 396 * We had a SP with a level of 'use' and no SA. We 397 * will just continue to process the packet without 398 * IPsec processing. 399 */ 400 ; 401 } else if (error) { 402 /* mbuf is already reclaimed in ipsec6_output_trans. */ 403 m = NULL; 404 switch (error) { 405 case EHOSTUNREACH: 406 case ENETUNREACH: 407 case EMSGSIZE: 408 case ENOBUFS: 409 case ENOMEM: 410 break; 411 default: 412 printf("[%s:%d] (ipsec): error code %d\n", 413 __func__, __LINE__, error); 414 /* FALLTHROUGH */ 415 case ENOENT: 416 /* don't show these error codes to the user */ 417 error = 0; 418 break; 419 } 420 goto bad; 421 } else if (!needipsectun) { 422 /* 423 * In the FAST IPSec case we have already 424 * re-injected the packet and it has been freed 425 * by the ipsec_done() function. So, just clean 426 * up after ourselves. 427 */ 428 m = NULL; 429 goto done; 430 } 431 if (exthdrs.ip6e_rthdr) { 432 /* ah6_output doesn't modify mbuf chain */ 433 rh->ip6r_segleft = segleft_org; 434 } 435 skip_ipsec2:; 436 #endif /* IPSEC */ 437 438 /* 439 * If there is a routing header, replace the destination address field 440 * with the first hop of the routing header. 441 */ 442 if (exthdrs.ip6e_rthdr) { 443 struct ip6_rthdr *rh = 444 (struct ip6_rthdr *)(mtod(exthdrs.ip6e_rthdr, 445 struct ip6_rthdr *)); 446 struct ip6_rthdr0 *rh0; 447 struct in6_addr *addr; 448 struct sockaddr_in6 sa; 449 450 switch (rh->ip6r_type) { 451 case IPV6_RTHDR_TYPE_0: 452 rh0 = (struct ip6_rthdr0 *)rh; 453 addr = (struct in6_addr *)(rh0 + 1); 454 455 /* 456 * construct a sockaddr_in6 form of 457 * the first hop. 458 * 459 * XXX: we may not have enough 460 * information about its scope zone; 461 * there is no standard API to pass 462 * the information from the 463 * application. 464 */ 465 bzero(&sa, sizeof(sa)); 466 sa.sin6_family = AF_INET6; 467 sa.sin6_len = sizeof(sa); 468 sa.sin6_addr = addr[0]; 469 if ((error = sa6_embedscope(&sa, 470 V_ip6_use_defzone)) != 0) { 471 goto bad; 472 } 473 ip6->ip6_dst = sa.sin6_addr; 474 bcopy(&addr[1], &addr[0], sizeof(struct in6_addr) 475 * (rh0->ip6r0_segleft - 1)); 476 addr[rh0->ip6r0_segleft - 1] = finaldst; 477 /* XXX */ 478 in6_clearscope(addr + rh0->ip6r0_segleft - 1); 479 break; 480 default: /* is it possible? */ 481 error = EINVAL; 482 goto bad; 483 } 484 } 485 486 /* Source address validation */ 487 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) && 488 (flags & IPV6_UNSPECSRC) == 0) { 489 error = EOPNOTSUPP; 490 V_ip6stat.ip6s_badscope++; 491 goto bad; 492 } 493 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src)) { 494 error = EOPNOTSUPP; 495 V_ip6stat.ip6s_badscope++; 496 goto bad; 497 } 498 499 V_ip6stat.ip6s_localout++; 500 501 /* 502 * Route packet. 503 */ 504 if (ro == 0) { 505 ro = &ip6route; 506 bzero((caddr_t)ro, sizeof(*ro)); 507 } 508 ro_pmtu = ro; 509 if (opt && opt->ip6po_rthdr) 510 ro = &opt->ip6po_route; 511 dst = (struct sockaddr_in6 *)&ro->ro_dst; 512 513 again: 514 /* 515 * if specified, try to fill in the traffic class field. 516 * do not override if a non-zero value is already set. 517 * we check the diffserv field and the ecn field separately. 518 */ 519 if (opt && opt->ip6po_tclass >= 0) { 520 int mask = 0; 521 522 if ((ip6->ip6_flow & htonl(0xfc << 20)) == 0) 523 mask |= 0xfc; 524 if ((ip6->ip6_flow & htonl(0x03 << 20)) == 0) 525 mask |= 0x03; 526 if (mask != 0) 527 ip6->ip6_flow |= htonl((opt->ip6po_tclass & mask) << 20); 528 } 529 530 /* fill in or override the hop limit field, if necessary. */ 531 if (opt && opt->ip6po_hlim != -1) 532 ip6->ip6_hlim = opt->ip6po_hlim & 0xff; 533 else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 534 if (im6o != NULL) 535 ip6->ip6_hlim = im6o->im6o_multicast_hlim; 536 else 537 ip6->ip6_hlim = V_ip6_defmcasthlim; 538 } 539 540 #ifdef IPSEC 541 /* 542 * We may re-inject packets into the stack here. 543 */ 544 if (needipsec && needipsectun) { 545 struct ipsec_output_state state; 546 547 /* 548 * All the extension headers will become inaccessible 549 * (since they can be encrypted). 550 * Don't panic, we need no more updates to extension headers 551 * on inner IPv6 packet (since they are now encapsulated). 552 * 553 * IPv6 [ESP|AH] IPv6 [extension headers] payload 554 */ 555 bzero(&exthdrs, sizeof(exthdrs)); 556 exthdrs.ip6e_ip6 = m; 557 558 bzero(&state, sizeof(state)); 559 state.m = m; 560 state.ro = (struct route *)ro; 561 state.dst = (struct sockaddr *)dst; 562 563 error = ipsec6_output_tunnel(&state, sp, flags); 564 565 m = state.m; 566 ro = (struct route_in6 *)state.ro; 567 dst = (struct sockaddr_in6 *)state.dst; 568 if (error == EJUSTRETURN) { 569 /* 570 * We had a SP with a level of 'use' and no SA. We 571 * will just continue to process the packet without 572 * IPsec processing. 573 */ 574 ; 575 } else if (error) { 576 /* mbuf is already reclaimed in ipsec6_output_tunnel. */ 577 m0 = m = NULL; 578 m = NULL; 579 switch (error) { 580 case EHOSTUNREACH: 581 case ENETUNREACH: 582 case EMSGSIZE: 583 case ENOBUFS: 584 case ENOMEM: 585 break; 586 default: 587 printf("[%s:%d] (ipsec): error code %d\n", 588 __func__, __LINE__, error); 589 /* FALLTHROUGH */ 590 case ENOENT: 591 /* don't show these error codes to the user */ 592 error = 0; 593 break; 594 } 595 goto bad; 596 } else { 597 /* 598 * In the FAST IPSec case we have already 599 * re-injected the packet and it has been freed 600 * by the ipsec_done() function. So, just clean 601 * up after ourselves. 602 */ 603 m = NULL; 604 goto done; 605 } 606 607 exthdrs.ip6e_ip6 = m; 608 } 609 #endif /* IPSEC */ 610 611 /* adjust pointer */ 612 ip6 = mtod(m, struct ip6_hdr *); 613 614 bzero(&dst_sa, sizeof(dst_sa)); 615 dst_sa.sin6_family = AF_INET6; 616 dst_sa.sin6_len = sizeof(dst_sa); 617 dst_sa.sin6_addr = ip6->ip6_dst; 618 if ((error = in6_selectroute(&dst_sa, opt, im6o, ro, 619 &ifp, &rt)) != 0) { 620 switch (error) { 621 case EHOSTUNREACH: 622 V_ip6stat.ip6s_noroute++; 623 break; 624 case EADDRNOTAVAIL: 625 default: 626 break; /* XXX statistics? */ 627 } 628 if (ifp != NULL) 629 in6_ifstat_inc(ifp, ifs6_out_discard); 630 goto bad; 631 } 632 if (rt == NULL) { 633 /* 634 * If in6_selectroute() does not return a route entry, 635 * dst may not have been updated. 636 */ 637 *dst = dst_sa; /* XXX */ 638 } 639 640 /* 641 * then rt (for unicast) and ifp must be non-NULL valid values. 642 */ 643 if ((flags & IPV6_FORWARDING) == 0) { 644 /* XXX: the FORWARDING flag can be set for mrouting. */ 645 in6_ifstat_inc(ifp, ifs6_out_request); 646 } 647 if (rt != NULL) { 648 ia = (struct in6_ifaddr *)(rt->rt_ifa); 649 rt->rt_use++; 650 } 651 652 /* 653 * The outgoing interface must be in the zone of source and 654 * destination addresses. We should use ia_ifp to support the 655 * case of sending packets to an address of our own. 656 */ 657 if (ia != NULL && ia->ia_ifp) 658 origifp = ia->ia_ifp; 659 else 660 origifp = ifp; 661 662 src0 = ip6->ip6_src; 663 if (in6_setscope(&src0, origifp, &zone)) 664 goto badscope; 665 bzero(&src_sa, sizeof(src_sa)); 666 src_sa.sin6_family = AF_INET6; 667 src_sa.sin6_len = sizeof(src_sa); 668 src_sa.sin6_addr = ip6->ip6_src; 669 if (sa6_recoverscope(&src_sa) || zone != src_sa.sin6_scope_id) 670 goto badscope; 671 672 dst0 = ip6->ip6_dst; 673 if (in6_setscope(&dst0, origifp, &zone)) 674 goto badscope; 675 /* re-initialize to be sure */ 676 bzero(&dst_sa, sizeof(dst_sa)); 677 dst_sa.sin6_family = AF_INET6; 678 dst_sa.sin6_len = sizeof(dst_sa); 679 dst_sa.sin6_addr = ip6->ip6_dst; 680 if (sa6_recoverscope(&dst_sa) || zone != dst_sa.sin6_scope_id) { 681 goto badscope; 682 } 683 684 /* scope check is done. */ 685 goto routefound; 686 687 badscope: 688 V_ip6stat.ip6s_badscope++; 689 in6_ifstat_inc(origifp, ifs6_out_discard); 690 if (error == 0) 691 error = EHOSTUNREACH; /* XXX */ 692 goto bad; 693 694 routefound: 695 if (rt && !IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 696 if (opt && opt->ip6po_nextroute.ro_rt) { 697 /* 698 * The nexthop is explicitly specified by the 699 * application. We assume the next hop is an IPv6 700 * address. 701 */ 702 dst = (struct sockaddr_in6 *)opt->ip6po_nexthop; 703 } 704 else if ((rt->rt_flags & RTF_GATEWAY)) 705 dst = (struct sockaddr_in6 *)rt->rt_gateway; 706 } 707 708 if (!IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 709 m->m_flags &= ~(M_BCAST | M_MCAST); /* just in case */ 710 } else { 711 struct in6_multi *in6m; 712 713 m->m_flags = (m->m_flags & ~M_BCAST) | M_MCAST; 714 715 in6_ifstat_inc(ifp, ifs6_out_mcast); 716 717 /* 718 * Confirm that the outgoing interface supports multicast. 719 */ 720 if (!(ifp->if_flags & IFF_MULTICAST)) { 721 V_ip6stat.ip6s_noroute++; 722 in6_ifstat_inc(ifp, ifs6_out_discard); 723 error = ENETUNREACH; 724 goto bad; 725 } 726 IN6_LOOKUP_MULTI(ip6->ip6_dst, ifp, in6m); 727 if (in6m != NULL && 728 (im6o == NULL || im6o->im6o_multicast_loop)) { 729 /* 730 * If we belong to the destination multicast group 731 * on the outgoing interface, and the caller did not 732 * forbid loopback, loop back a copy. 733 */ 734 ip6_mloopback(ifp, m, dst); 735 } else { 736 /* 737 * If we are acting as a multicast router, perform 738 * multicast forwarding as if the packet had just 739 * arrived on the interface to which we are about 740 * to send. The multicast forwarding function 741 * recursively calls this function, using the 742 * IPV6_FORWARDING flag to prevent infinite recursion. 743 * 744 * Multicasts that are looped back by ip6_mloopback(), 745 * above, will be forwarded by the ip6_input() routine, 746 * if necessary. 747 */ 748 if (ip6_mrouter && (flags & IPV6_FORWARDING) == 0) { 749 /* 750 * XXX: ip6_mforward expects that rcvif is NULL 751 * when it is called from the originating path. 752 * However, it is not always the case, since 753 * some versions of MGETHDR() does not 754 * initialize the field. 755 */ 756 m->m_pkthdr.rcvif = NULL; 757 if (ip6_mforward(ip6, ifp, m) != 0) { 758 m_freem(m); 759 goto done; 760 } 761 } 762 } 763 /* 764 * Multicasts with a hoplimit of zero may be looped back, 765 * above, but must not be transmitted on a network. 766 * Also, multicasts addressed to the loopback interface 767 * are not sent -- the above call to ip6_mloopback() will 768 * loop back a copy if this host actually belongs to the 769 * destination group on the loopback interface. 770 */ 771 if (ip6->ip6_hlim == 0 || (ifp->if_flags & IFF_LOOPBACK) || 772 IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst)) { 773 m_freem(m); 774 goto done; 775 } 776 } 777 778 /* 779 * Fill the outgoing inteface to tell the upper layer 780 * to increment per-interface statistics. 781 */ 782 if (ifpp) 783 *ifpp = ifp; 784 785 /* Determine path MTU. */ 786 if ((error = ip6_getpmtu(ro_pmtu, ro, ifp, &finaldst, &mtu, 787 &alwaysfrag)) != 0) 788 goto bad; 789 790 /* 791 * The caller of this function may specify to use the minimum MTU 792 * in some cases. 793 * An advanced API option (IPV6_USE_MIN_MTU) can also override MTU 794 * setting. The logic is a bit complicated; by default, unicast 795 * packets will follow path MTU while multicast packets will be sent at 796 * the minimum MTU. If IP6PO_MINMTU_ALL is specified, all packets 797 * including unicast ones will be sent at the minimum MTU. Multicast 798 * packets will always be sent at the minimum MTU unless 799 * IP6PO_MINMTU_DISABLE is explicitly specified. 800 * See RFC 3542 for more details. 801 */ 802 if (mtu > IPV6_MMTU) { 803 if ((flags & IPV6_MINMTU)) 804 mtu = IPV6_MMTU; 805 else if (opt && opt->ip6po_minmtu == IP6PO_MINMTU_ALL) 806 mtu = IPV6_MMTU; 807 else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) && 808 (opt == NULL || 809 opt->ip6po_minmtu != IP6PO_MINMTU_DISABLE)) { 810 mtu = IPV6_MMTU; 811 } 812 } 813 814 /* 815 * clear embedded scope identifiers if necessary. 816 * in6_clearscope will touch the addresses only when necessary. 817 */ 818 in6_clearscope(&ip6->ip6_src); 819 in6_clearscope(&ip6->ip6_dst); 820 821 /* 822 * If the outgoing packet contains a hop-by-hop options header, 823 * it must be examined and processed even by the source node. 824 * (RFC 2460, section 4.) 825 */ 826 if (exthdrs.ip6e_hbh) { 827 struct ip6_hbh *hbh = mtod(exthdrs.ip6e_hbh, struct ip6_hbh *); 828 u_int32_t dummy; /* XXX unused */ 829 u_int32_t plen = 0; /* XXX: ip6_process will check the value */ 830 831 #ifdef DIAGNOSTIC 832 if ((hbh->ip6h_len + 1) << 3 > exthdrs.ip6e_hbh->m_len) 833 panic("ip6e_hbh is not continuous"); 834 #endif 835 /* 836 * XXX: if we have to send an ICMPv6 error to the sender, 837 * we need the M_LOOP flag since icmp6_error() expects 838 * the IPv6 and the hop-by-hop options header are 839 * continuous unless the flag is set. 840 */ 841 m->m_flags |= M_LOOP; 842 m->m_pkthdr.rcvif = ifp; 843 if (ip6_process_hopopts(m, (u_int8_t *)(hbh + 1), 844 ((hbh->ip6h_len + 1) << 3) - sizeof(struct ip6_hbh), 845 &dummy, &plen) < 0) { 846 /* m was already freed at this point */ 847 error = EINVAL;/* better error? */ 848 goto done; 849 } 850 m->m_flags &= ~M_LOOP; /* XXX */ 851 m->m_pkthdr.rcvif = NULL; 852 } 853 854 /* Jump over all PFIL processing if hooks are not active. */ 855 if (!PFIL_HOOKED(&inet6_pfil_hook)) 856 goto passout; 857 858 odst = ip6->ip6_dst; 859 /* Run through list of hooks for output packets. */ 860 error = pfil_run_hooks(&inet6_pfil_hook, &m, ifp, PFIL_OUT, inp); 861 if (error != 0 || m == NULL) 862 goto done; 863 ip6 = mtod(m, struct ip6_hdr *); 864 865 /* See if destination IP address was changed by packet filter. */ 866 if (!IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst)) { 867 m->m_flags |= M_SKIP_FIREWALL; 868 /* If destination is now ourself drop to ip6_input(). */ 869 if (in6_localaddr(&ip6->ip6_dst)) { 870 if (m->m_pkthdr.rcvif == NULL) 871 m->m_pkthdr.rcvif = V_loif; 872 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) { 873 m->m_pkthdr.csum_flags |= 874 CSUM_DATA_VALID | CSUM_PSEUDO_HDR; 875 m->m_pkthdr.csum_data = 0xffff; 876 } 877 m->m_pkthdr.csum_flags |= 878 CSUM_IP_CHECKED | CSUM_IP_VALID; 879 error = netisr_queue(NETISR_IPV6, m); 880 goto done; 881 } else 882 goto again; /* Redo the routing table lookup. */ 883 } 884 885 /* XXX: IPFIREWALL_FORWARD */ 886 887 passout: 888 /* 889 * Send the packet to the outgoing interface. 890 * If necessary, do IPv6 fragmentation before sending. 891 * 892 * the logic here is rather complex: 893 * 1: normal case (dontfrag == 0, alwaysfrag == 0) 894 * 1-a: send as is if tlen <= path mtu 895 * 1-b: fragment if tlen > path mtu 896 * 897 * 2: if user asks us not to fragment (dontfrag == 1) 898 * 2-a: send as is if tlen <= interface mtu 899 * 2-b: error if tlen > interface mtu 900 * 901 * 3: if we always need to attach fragment header (alwaysfrag == 1) 902 * always fragment 903 * 904 * 4: if dontfrag == 1 && alwaysfrag == 1 905 * error, as we cannot handle this conflicting request 906 */ 907 tlen = m->m_pkthdr.len; 908 909 if (opt && (opt->ip6po_flags & IP6PO_DONTFRAG)) 910 dontfrag = 1; 911 else 912 dontfrag = 0; 913 if (dontfrag && alwaysfrag) { /* case 4 */ 914 /* conflicting request - can't transmit */ 915 error = EMSGSIZE; 916 goto bad; 917 } 918 if (dontfrag && tlen > IN6_LINKMTU(ifp)) { /* case 2-b */ 919 /* 920 * Even if the DONTFRAG option is specified, we cannot send the 921 * packet when the data length is larger than the MTU of the 922 * outgoing interface. 923 * Notify the error by sending IPV6_PATHMTU ancillary data as 924 * well as returning an error code (the latter is not described 925 * in the API spec.) 926 */ 927 u_int32_t mtu32; 928 struct ip6ctlparam ip6cp; 929 930 mtu32 = (u_int32_t)mtu; 931 bzero(&ip6cp, sizeof(ip6cp)); 932 ip6cp.ip6c_cmdarg = (void *)&mtu32; 933 pfctlinput2(PRC_MSGSIZE, (struct sockaddr *)&ro_pmtu->ro_dst, 934 (void *)&ip6cp); 935 936 error = EMSGSIZE; 937 goto bad; 938 } 939 940 /* 941 * transmit packet without fragmentation 942 */ 943 if (dontfrag || (!alwaysfrag && tlen <= mtu)) { /* case 1-a and 2-a */ 944 struct in6_ifaddr *ia6; 945 946 ip6 = mtod(m, struct ip6_hdr *); 947 ia6 = in6_ifawithifp(ifp, &ip6->ip6_src); 948 if (ia6) { 949 /* Record statistics for this interface address. */ 950 ia6->ia_ifa.if_opackets++; 951 ia6->ia_ifa.if_obytes += m->m_pkthdr.len; 952 } 953 error = nd6_output(ifp, origifp, m, dst, ro->ro_rt); 954 goto done; 955 } 956 957 /* 958 * try to fragment the packet. case 1-b and 3 959 */ 960 if (mtu < IPV6_MMTU) { 961 /* path MTU cannot be less than IPV6_MMTU */ 962 error = EMSGSIZE; 963 in6_ifstat_inc(ifp, ifs6_out_fragfail); 964 goto bad; 965 } else if (ip6->ip6_plen == 0) { 966 /* jumbo payload cannot be fragmented */ 967 error = EMSGSIZE; 968 in6_ifstat_inc(ifp, ifs6_out_fragfail); 969 goto bad; 970 } else { 971 struct mbuf **mnext, *m_frgpart; 972 struct ip6_frag *ip6f; 973 u_int32_t id = htonl(ip6_randomid()); 974 u_char nextproto; 975 976 int qslots = ifp->if_snd.ifq_maxlen - ifp->if_snd.ifq_len; 977 978 /* 979 * Too large for the destination or interface; 980 * fragment if possible. 981 * Must be able to put at least 8 bytes per fragment. 982 */ 983 hlen = unfragpartlen; 984 if (mtu > IPV6_MAXPACKET) 985 mtu = IPV6_MAXPACKET; 986 987 len = (mtu - hlen - sizeof(struct ip6_frag)) & ~7; 988 if (len < 8) { 989 error = EMSGSIZE; 990 in6_ifstat_inc(ifp, ifs6_out_fragfail); 991 goto bad; 992 } 993 994 /* 995 * Verify that we have any chance at all of being able to queue 996 * the packet or packet fragments 997 */ 998 if (qslots <= 0 || ((u_int)qslots * (mtu - hlen) 999 < tlen /* - hlen */)) { 1000 error = ENOBUFS; 1001 V_ip6stat.ip6s_odropped++; 1002 goto bad; 1003 } 1004 1005 mnext = &m->m_nextpkt; 1006 1007 /* 1008 * Change the next header field of the last header in the 1009 * unfragmentable part. 1010 */ 1011 if (exthdrs.ip6e_rthdr) { 1012 nextproto = *mtod(exthdrs.ip6e_rthdr, u_char *); 1013 *mtod(exthdrs.ip6e_rthdr, u_char *) = IPPROTO_FRAGMENT; 1014 } else if (exthdrs.ip6e_dest1) { 1015 nextproto = *mtod(exthdrs.ip6e_dest1, u_char *); 1016 *mtod(exthdrs.ip6e_dest1, u_char *) = IPPROTO_FRAGMENT; 1017 } else if (exthdrs.ip6e_hbh) { 1018 nextproto = *mtod(exthdrs.ip6e_hbh, u_char *); 1019 *mtod(exthdrs.ip6e_hbh, u_char *) = IPPROTO_FRAGMENT; 1020 } else { 1021 nextproto = ip6->ip6_nxt; 1022 ip6->ip6_nxt = IPPROTO_FRAGMENT; 1023 } 1024 1025 /* 1026 * Loop through length of segment after first fragment, 1027 * make new header and copy data of each part and link onto 1028 * chain. 1029 */ 1030 m0 = m; 1031 for (off = hlen; off < tlen; off += len) { 1032 MGETHDR(m, M_DONTWAIT, MT_HEADER); 1033 if (!m) { 1034 error = ENOBUFS; 1035 V_ip6stat.ip6s_odropped++; 1036 goto sendorfree; 1037 } 1038 m->m_pkthdr.rcvif = NULL; 1039 m->m_flags = m0->m_flags & M_COPYFLAGS; 1040 *mnext = m; 1041 mnext = &m->m_nextpkt; 1042 m->m_data += max_linkhdr; 1043 mhip6 = mtod(m, struct ip6_hdr *); 1044 *mhip6 = *ip6; 1045 m->m_len = sizeof(*mhip6); 1046 error = ip6_insertfraghdr(m0, m, hlen, &ip6f); 1047 if (error) { 1048 V_ip6stat.ip6s_odropped++; 1049 goto sendorfree; 1050 } 1051 ip6f->ip6f_offlg = htons((u_short)((off - hlen) & ~7)); 1052 if (off + len >= tlen) 1053 len = tlen - off; 1054 else 1055 ip6f->ip6f_offlg |= IP6F_MORE_FRAG; 1056 mhip6->ip6_plen = htons((u_short)(len + hlen + 1057 sizeof(*ip6f) - sizeof(struct ip6_hdr))); 1058 if ((m_frgpart = m_copy(m0, off, len)) == 0) { 1059 error = ENOBUFS; 1060 V_ip6stat.ip6s_odropped++; 1061 goto sendorfree; 1062 } 1063 m_cat(m, m_frgpart); 1064 m->m_pkthdr.len = len + hlen + sizeof(*ip6f); 1065 m->m_pkthdr.rcvif = NULL; 1066 ip6f->ip6f_reserved = 0; 1067 ip6f->ip6f_ident = id; 1068 ip6f->ip6f_nxt = nextproto; 1069 V_ip6stat.ip6s_ofragments++; 1070 in6_ifstat_inc(ifp, ifs6_out_fragcreat); 1071 } 1072 1073 in6_ifstat_inc(ifp, ifs6_out_fragok); 1074 } 1075 1076 /* 1077 * Remove leading garbages. 1078 */ 1079 sendorfree: 1080 m = m0->m_nextpkt; 1081 m0->m_nextpkt = 0; 1082 m_freem(m0); 1083 for (m0 = m; m; m = m0) { 1084 m0 = m->m_nextpkt; 1085 m->m_nextpkt = 0; 1086 if (error == 0) { 1087 /* Record statistics for this interface address. */ 1088 if (ia) { 1089 ia->ia_ifa.if_opackets++; 1090 ia->ia_ifa.if_obytes += m->m_pkthdr.len; 1091 } 1092 error = nd6_output(ifp, origifp, m, dst, ro->ro_rt); 1093 } else 1094 m_freem(m); 1095 } 1096 1097 if (error == 0) 1098 V_ip6stat.ip6s_fragmented++; 1099 1100 done: 1101 if (ro == &ip6route && ro->ro_rt) { /* brace necessary for RTFREE */ 1102 RTFREE(ro->ro_rt); 1103 } else if (ro_pmtu == &ip6route && ro_pmtu->ro_rt) { 1104 RTFREE(ro_pmtu->ro_rt); 1105 } 1106 #ifdef IPSEC 1107 if (sp != NULL) 1108 KEY_FREESP(&sp); 1109 #endif 1110 1111 return (error); 1112 1113 freehdrs: 1114 m_freem(exthdrs.ip6e_hbh); /* m_freem will check if mbuf is 0 */ 1115 m_freem(exthdrs.ip6e_dest1); 1116 m_freem(exthdrs.ip6e_rthdr); 1117 m_freem(exthdrs.ip6e_dest2); 1118 /* FALLTHROUGH */ 1119 bad: 1120 if (m) 1121 m_freem(m); 1122 goto done; 1123 } 1124 1125 static int 1126 ip6_copyexthdr(struct mbuf **mp, caddr_t hdr, int hlen) 1127 { 1128 struct mbuf *m; 1129 1130 if (hlen > MCLBYTES) 1131 return (ENOBUFS); /* XXX */ 1132 1133 MGET(m, M_DONTWAIT, MT_DATA); 1134 if (!m) 1135 return (ENOBUFS); 1136 1137 if (hlen > MLEN) { 1138 MCLGET(m, M_DONTWAIT); 1139 if ((m->m_flags & M_EXT) == 0) { 1140 m_free(m); 1141 return (ENOBUFS); 1142 } 1143 } 1144 m->m_len = hlen; 1145 if (hdr) 1146 bcopy(hdr, mtod(m, caddr_t), hlen); 1147 1148 *mp = m; 1149 return (0); 1150 } 1151 1152 /* 1153 * Insert jumbo payload option. 1154 */ 1155 static int 1156 ip6_insert_jumboopt(struct ip6_exthdrs *exthdrs, u_int32_t plen) 1157 { 1158 struct mbuf *mopt; 1159 u_char *optbuf; 1160 u_int32_t v; 1161 1162 #define JUMBOOPTLEN 8 /* length of jumbo payload option and padding */ 1163 1164 /* 1165 * If there is no hop-by-hop options header, allocate new one. 1166 * If there is one but it doesn't have enough space to store the 1167 * jumbo payload option, allocate a cluster to store the whole options. 1168 * Otherwise, use it to store the options. 1169 */ 1170 if (exthdrs->ip6e_hbh == 0) { 1171 MGET(mopt, M_DONTWAIT, MT_DATA); 1172 if (mopt == 0) 1173 return (ENOBUFS); 1174 mopt->m_len = JUMBOOPTLEN; 1175 optbuf = mtod(mopt, u_char *); 1176 optbuf[1] = 0; /* = ((JUMBOOPTLEN) >> 3) - 1 */ 1177 exthdrs->ip6e_hbh = mopt; 1178 } else { 1179 struct ip6_hbh *hbh; 1180 1181 mopt = exthdrs->ip6e_hbh; 1182 if (M_TRAILINGSPACE(mopt) < JUMBOOPTLEN) { 1183 /* 1184 * XXX assumption: 1185 * - exthdrs->ip6e_hbh is not referenced from places 1186 * other than exthdrs. 1187 * - exthdrs->ip6e_hbh is not an mbuf chain. 1188 */ 1189 int oldoptlen = mopt->m_len; 1190 struct mbuf *n; 1191 1192 /* 1193 * XXX: give up if the whole (new) hbh header does 1194 * not fit even in an mbuf cluster. 1195 */ 1196 if (oldoptlen + JUMBOOPTLEN > MCLBYTES) 1197 return (ENOBUFS); 1198 1199 /* 1200 * As a consequence, we must always prepare a cluster 1201 * at this point. 1202 */ 1203 MGET(n, M_DONTWAIT, MT_DATA); 1204 if (n) { 1205 MCLGET(n, M_DONTWAIT); 1206 if ((n->m_flags & M_EXT) == 0) { 1207 m_freem(n); 1208 n = NULL; 1209 } 1210 } 1211 if (!n) 1212 return (ENOBUFS); 1213 n->m_len = oldoptlen + JUMBOOPTLEN; 1214 bcopy(mtod(mopt, caddr_t), mtod(n, caddr_t), 1215 oldoptlen); 1216 optbuf = mtod(n, caddr_t) + oldoptlen; 1217 m_freem(mopt); 1218 mopt = exthdrs->ip6e_hbh = n; 1219 } else { 1220 optbuf = mtod(mopt, u_char *) + mopt->m_len; 1221 mopt->m_len += JUMBOOPTLEN; 1222 } 1223 optbuf[0] = IP6OPT_PADN; 1224 optbuf[1] = 1; 1225 1226 /* 1227 * Adjust the header length according to the pad and 1228 * the jumbo payload option. 1229 */ 1230 hbh = mtod(mopt, struct ip6_hbh *); 1231 hbh->ip6h_len += (JUMBOOPTLEN >> 3); 1232 } 1233 1234 /* fill in the option. */ 1235 optbuf[2] = IP6OPT_JUMBO; 1236 optbuf[3] = 4; 1237 v = (u_int32_t)htonl(plen + JUMBOOPTLEN); 1238 bcopy(&v, &optbuf[4], sizeof(u_int32_t)); 1239 1240 /* finally, adjust the packet header length */ 1241 exthdrs->ip6e_ip6->m_pkthdr.len += JUMBOOPTLEN; 1242 1243 return (0); 1244 #undef JUMBOOPTLEN 1245 } 1246 1247 /* 1248 * Insert fragment header and copy unfragmentable header portions. 1249 */ 1250 static int 1251 ip6_insertfraghdr(struct mbuf *m0, struct mbuf *m, int hlen, 1252 struct ip6_frag **frghdrp) 1253 { 1254 struct mbuf *n, *mlast; 1255 1256 if (hlen > sizeof(struct ip6_hdr)) { 1257 n = m_copym(m0, sizeof(struct ip6_hdr), 1258 hlen - sizeof(struct ip6_hdr), M_DONTWAIT); 1259 if (n == 0) 1260 return (ENOBUFS); 1261 m->m_next = n; 1262 } else 1263 n = m; 1264 1265 /* Search for the last mbuf of unfragmentable part. */ 1266 for (mlast = n; mlast->m_next; mlast = mlast->m_next) 1267 ; 1268 1269 if ((mlast->m_flags & M_EXT) == 0 && 1270 M_TRAILINGSPACE(mlast) >= sizeof(struct ip6_frag)) { 1271 /* use the trailing space of the last mbuf for the fragment hdr */ 1272 *frghdrp = (struct ip6_frag *)(mtod(mlast, caddr_t) + 1273 mlast->m_len); 1274 mlast->m_len += sizeof(struct ip6_frag); 1275 m->m_pkthdr.len += sizeof(struct ip6_frag); 1276 } else { 1277 /* allocate a new mbuf for the fragment header */ 1278 struct mbuf *mfrg; 1279 1280 MGET(mfrg, M_DONTWAIT, MT_DATA); 1281 if (mfrg == 0) 1282 return (ENOBUFS); 1283 mfrg->m_len = sizeof(struct ip6_frag); 1284 *frghdrp = mtod(mfrg, struct ip6_frag *); 1285 mlast->m_next = mfrg; 1286 } 1287 1288 return (0); 1289 } 1290 1291 static int 1292 ip6_getpmtu(struct route_in6 *ro_pmtu, struct route_in6 *ro, 1293 struct ifnet *ifp, struct in6_addr *dst, u_long *mtup, 1294 int *alwaysfragp) 1295 { 1296 u_int32_t mtu = 0; 1297 int alwaysfrag = 0; 1298 int error = 0; 1299 1300 if (ro_pmtu != ro) { 1301 /* The first hop and the final destination may differ. */ 1302 struct sockaddr_in6 *sa6_dst = 1303 (struct sockaddr_in6 *)&ro_pmtu->ro_dst; 1304 if (ro_pmtu->ro_rt && 1305 ((ro_pmtu->ro_rt->rt_flags & RTF_UP) == 0 || 1306 !IN6_ARE_ADDR_EQUAL(&sa6_dst->sin6_addr, dst))) { 1307 RTFREE(ro_pmtu->ro_rt); 1308 ro_pmtu->ro_rt = (struct rtentry *)NULL; 1309 } 1310 if (ro_pmtu->ro_rt == NULL) { 1311 bzero(sa6_dst, sizeof(*sa6_dst)); 1312 sa6_dst->sin6_family = AF_INET6; 1313 sa6_dst->sin6_len = sizeof(struct sockaddr_in6); 1314 sa6_dst->sin6_addr = *dst; 1315 1316 rtalloc((struct route *)ro_pmtu); 1317 } 1318 } 1319 if (ro_pmtu->ro_rt) { 1320 u_int32_t ifmtu; 1321 struct in_conninfo inc; 1322 1323 bzero(&inc, sizeof(inc)); 1324 inc.inc_flags |= INC_ISIPV6; 1325 inc.inc6_faddr = *dst; 1326 1327 if (ifp == NULL) 1328 ifp = ro_pmtu->ro_rt->rt_ifp; 1329 ifmtu = IN6_LINKMTU(ifp); 1330 mtu = tcp_hc_getmtu(&inc); 1331 if (mtu) 1332 mtu = min(mtu, ro_pmtu->ro_rt->rt_rmx.rmx_mtu); 1333 else 1334 mtu = ro_pmtu->ro_rt->rt_rmx.rmx_mtu; 1335 if (mtu == 0) 1336 mtu = ifmtu; 1337 else if (mtu < IPV6_MMTU) { 1338 /* 1339 * RFC2460 section 5, last paragraph: 1340 * if we record ICMPv6 too big message with 1341 * mtu < IPV6_MMTU, transmit packets sized IPV6_MMTU 1342 * or smaller, with framgent header attached. 1343 * (fragment header is needed regardless from the 1344 * packet size, for translators to identify packets) 1345 */ 1346 alwaysfrag = 1; 1347 mtu = IPV6_MMTU; 1348 } else if (mtu > ifmtu) { 1349 /* 1350 * The MTU on the route is larger than the MTU on 1351 * the interface! This shouldn't happen, unless the 1352 * MTU of the interface has been changed after the 1353 * interface was brought up. Change the MTU in the 1354 * route to match the interface MTU (as long as the 1355 * field isn't locked). 1356 */ 1357 mtu = ifmtu; 1358 ro_pmtu->ro_rt->rt_rmx.rmx_mtu = mtu; 1359 } 1360 } else if (ifp) { 1361 mtu = IN6_LINKMTU(ifp); 1362 } else 1363 error = EHOSTUNREACH; /* XXX */ 1364 1365 *mtup = mtu; 1366 if (alwaysfragp) 1367 *alwaysfragp = alwaysfrag; 1368 return (error); 1369 } 1370 1371 /* 1372 * IP6 socket option processing. 1373 */ 1374 int 1375 ip6_ctloutput(struct socket *so, struct sockopt *sopt) 1376 { 1377 int optdatalen, uproto; 1378 void *optdata; 1379 struct inpcb *in6p = sotoinpcb(so); 1380 int error, optval; 1381 int level, op, optname; 1382 int optlen; 1383 struct thread *td; 1384 1385 level = sopt->sopt_level; 1386 op = sopt->sopt_dir; 1387 optname = sopt->sopt_name; 1388 optlen = sopt->sopt_valsize; 1389 td = sopt->sopt_td; 1390 error = 0; 1391 optval = 0; 1392 uproto = (int)so->so_proto->pr_protocol; 1393 1394 if (level == IPPROTO_IPV6) { 1395 switch (op) { 1396 1397 case SOPT_SET: 1398 switch (optname) { 1399 case IPV6_2292PKTOPTIONS: 1400 #ifdef IPV6_PKTOPTIONS 1401 case IPV6_PKTOPTIONS: 1402 #endif 1403 { 1404 struct mbuf *m; 1405 1406 error = soopt_getm(sopt, &m); /* XXX */ 1407 if (error != 0) 1408 break; 1409 error = soopt_mcopyin(sopt, m); /* XXX */ 1410 if (error != 0) 1411 break; 1412 error = ip6_pcbopts(&in6p->in6p_outputopts, 1413 m, so, sopt); 1414 m_freem(m); /* XXX */ 1415 break; 1416 } 1417 1418 /* 1419 * Use of some Hop-by-Hop options or some 1420 * Destination options, might require special 1421 * privilege. That is, normal applications 1422 * (without special privilege) might be forbidden 1423 * from setting certain options in outgoing packets, 1424 * and might never see certain options in received 1425 * packets. [RFC 2292 Section 6] 1426 * KAME specific note: 1427 * KAME prevents non-privileged users from sending or 1428 * receiving ANY hbh/dst options in order to avoid 1429 * overhead of parsing options in the kernel. 1430 */ 1431 case IPV6_RECVHOPOPTS: 1432 case IPV6_RECVDSTOPTS: 1433 case IPV6_RECVRTHDRDSTOPTS: 1434 if (td != NULL) { 1435 error = priv_check(td, 1436 PRIV_NETINET_SETHDROPTS); 1437 if (error) 1438 break; 1439 } 1440 /* FALLTHROUGH */ 1441 case IPV6_UNICAST_HOPS: 1442 case IPV6_HOPLIMIT: 1443 case IPV6_FAITH: 1444 1445 case IPV6_RECVPKTINFO: 1446 case IPV6_RECVHOPLIMIT: 1447 case IPV6_RECVRTHDR: 1448 case IPV6_RECVPATHMTU: 1449 case IPV6_RECVTCLASS: 1450 case IPV6_V6ONLY: 1451 case IPV6_AUTOFLOWLABEL: 1452 if (optlen != sizeof(int)) { 1453 error = EINVAL; 1454 break; 1455 } 1456 error = sooptcopyin(sopt, &optval, 1457 sizeof optval, sizeof optval); 1458 if (error) 1459 break; 1460 switch (optname) { 1461 1462 case IPV6_UNICAST_HOPS: 1463 if (optval < -1 || optval >= 256) 1464 error = EINVAL; 1465 else { 1466 /* -1 = kernel default */ 1467 in6p->in6p_hops = optval; 1468 if ((in6p->inp_vflag & 1469 INP_IPV4) != 0) 1470 in6p->inp_ip_ttl = optval; 1471 } 1472 break; 1473 #define OPTSET(bit) \ 1474 do { \ 1475 if (optval) \ 1476 in6p->inp_flags |= (bit); \ 1477 else \ 1478 in6p->inp_flags &= ~(bit); \ 1479 } while (/*CONSTCOND*/ 0) 1480 #define OPTSET2292(bit) \ 1481 do { \ 1482 in6p->inp_flags |= IN6P_RFC2292; \ 1483 if (optval) \ 1484 in6p->inp_flags |= (bit); \ 1485 else \ 1486 in6p->inp_flags &= ~(bit); \ 1487 } while (/*CONSTCOND*/ 0) 1488 #define OPTBIT(bit) (in6p->inp_flags & (bit) ? 1 : 0) 1489 1490 case IPV6_RECVPKTINFO: 1491 /* cannot mix with RFC2292 */ 1492 if (OPTBIT(IN6P_RFC2292)) { 1493 error = EINVAL; 1494 break; 1495 } 1496 OPTSET(IN6P_PKTINFO); 1497 break; 1498 1499 case IPV6_HOPLIMIT: 1500 { 1501 struct ip6_pktopts **optp; 1502 1503 /* cannot mix with RFC2292 */ 1504 if (OPTBIT(IN6P_RFC2292)) { 1505 error = EINVAL; 1506 break; 1507 } 1508 optp = &in6p->in6p_outputopts; 1509 error = ip6_pcbopt(IPV6_HOPLIMIT, 1510 (u_char *)&optval, sizeof(optval), 1511 optp, (td != NULL) ? td->td_ucred : 1512 NULL, uproto); 1513 break; 1514 } 1515 1516 case IPV6_RECVHOPLIMIT: 1517 /* cannot mix with RFC2292 */ 1518 if (OPTBIT(IN6P_RFC2292)) { 1519 error = EINVAL; 1520 break; 1521 } 1522 OPTSET(IN6P_HOPLIMIT); 1523 break; 1524 1525 case IPV6_RECVHOPOPTS: 1526 /* cannot mix with RFC2292 */ 1527 if (OPTBIT(IN6P_RFC2292)) { 1528 error = EINVAL; 1529 break; 1530 } 1531 OPTSET(IN6P_HOPOPTS); 1532 break; 1533 1534 case IPV6_RECVDSTOPTS: 1535 /* cannot mix with RFC2292 */ 1536 if (OPTBIT(IN6P_RFC2292)) { 1537 error = EINVAL; 1538 break; 1539 } 1540 OPTSET(IN6P_DSTOPTS); 1541 break; 1542 1543 case IPV6_RECVRTHDRDSTOPTS: 1544 /* cannot mix with RFC2292 */ 1545 if (OPTBIT(IN6P_RFC2292)) { 1546 error = EINVAL; 1547 break; 1548 } 1549 OPTSET(IN6P_RTHDRDSTOPTS); 1550 break; 1551 1552 case IPV6_RECVRTHDR: 1553 /* cannot mix with RFC2292 */ 1554 if (OPTBIT(IN6P_RFC2292)) { 1555 error = EINVAL; 1556 break; 1557 } 1558 OPTSET(IN6P_RTHDR); 1559 break; 1560 1561 case IPV6_FAITH: 1562 OPTSET(INP_FAITH); 1563 break; 1564 1565 case IPV6_RECVPATHMTU: 1566 /* 1567 * We ignore this option for TCP 1568 * sockets. 1569 * (RFC3542 leaves this case 1570 * unspecified.) 1571 */ 1572 if (uproto != IPPROTO_TCP) 1573 OPTSET(IN6P_MTU); 1574 break; 1575 1576 case IPV6_V6ONLY: 1577 /* 1578 * make setsockopt(IPV6_V6ONLY) 1579 * available only prior to bind(2). 1580 * see ipng mailing list, Jun 22 2001. 1581 */ 1582 if (in6p->inp_lport || 1583 !IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) { 1584 error = EINVAL; 1585 break; 1586 } 1587 OPTSET(IN6P_IPV6_V6ONLY); 1588 if (optval) 1589 in6p->inp_vflag &= ~INP_IPV4; 1590 else 1591 in6p->inp_vflag |= INP_IPV4; 1592 break; 1593 case IPV6_RECVTCLASS: 1594 /* cannot mix with RFC2292 XXX */ 1595 if (OPTBIT(IN6P_RFC2292)) { 1596 error = EINVAL; 1597 break; 1598 } 1599 OPTSET(IN6P_TCLASS); 1600 break; 1601 case IPV6_AUTOFLOWLABEL: 1602 OPTSET(IN6P_AUTOFLOWLABEL); 1603 break; 1604 1605 } 1606 break; 1607 1608 case IPV6_TCLASS: 1609 case IPV6_DONTFRAG: 1610 case IPV6_USE_MIN_MTU: 1611 case IPV6_PREFER_TEMPADDR: 1612 if (optlen != sizeof(optval)) { 1613 error = EINVAL; 1614 break; 1615 } 1616 error = sooptcopyin(sopt, &optval, 1617 sizeof optval, sizeof optval); 1618 if (error) 1619 break; 1620 { 1621 struct ip6_pktopts **optp; 1622 optp = &in6p->in6p_outputopts; 1623 error = ip6_pcbopt(optname, 1624 (u_char *)&optval, sizeof(optval), 1625 optp, (td != NULL) ? td->td_ucred : 1626 NULL, uproto); 1627 break; 1628 } 1629 1630 case IPV6_2292PKTINFO: 1631 case IPV6_2292HOPLIMIT: 1632 case IPV6_2292HOPOPTS: 1633 case IPV6_2292DSTOPTS: 1634 case IPV6_2292RTHDR: 1635 /* RFC 2292 */ 1636 if (optlen != sizeof(int)) { 1637 error = EINVAL; 1638 break; 1639 } 1640 error = sooptcopyin(sopt, &optval, 1641 sizeof optval, sizeof optval); 1642 if (error) 1643 break; 1644 switch (optname) { 1645 case IPV6_2292PKTINFO: 1646 OPTSET2292(IN6P_PKTINFO); 1647 break; 1648 case IPV6_2292HOPLIMIT: 1649 OPTSET2292(IN6P_HOPLIMIT); 1650 break; 1651 case IPV6_2292HOPOPTS: 1652 /* 1653 * Check super-user privilege. 1654 * See comments for IPV6_RECVHOPOPTS. 1655 */ 1656 if (td != NULL) { 1657 error = priv_check(td, 1658 PRIV_NETINET_SETHDROPTS); 1659 if (error) 1660 return (error); 1661 } 1662 OPTSET2292(IN6P_HOPOPTS); 1663 break; 1664 case IPV6_2292DSTOPTS: 1665 if (td != NULL) { 1666 error = priv_check(td, 1667 PRIV_NETINET_SETHDROPTS); 1668 if (error) 1669 return (error); 1670 } 1671 OPTSET2292(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); /* XXX */ 1672 break; 1673 case IPV6_2292RTHDR: 1674 OPTSET2292(IN6P_RTHDR); 1675 break; 1676 } 1677 break; 1678 case IPV6_PKTINFO: 1679 case IPV6_HOPOPTS: 1680 case IPV6_RTHDR: 1681 case IPV6_DSTOPTS: 1682 case IPV6_RTHDRDSTOPTS: 1683 case IPV6_NEXTHOP: 1684 { 1685 /* new advanced API (RFC3542) */ 1686 u_char *optbuf; 1687 u_char optbuf_storage[MCLBYTES]; 1688 int optlen; 1689 struct ip6_pktopts **optp; 1690 1691 /* cannot mix with RFC2292 */ 1692 if (OPTBIT(IN6P_RFC2292)) { 1693 error = EINVAL; 1694 break; 1695 } 1696 1697 /* 1698 * We only ensure valsize is not too large 1699 * here. Further validation will be done 1700 * later. 1701 */ 1702 error = sooptcopyin(sopt, optbuf_storage, 1703 sizeof(optbuf_storage), 0); 1704 if (error) 1705 break; 1706 optlen = sopt->sopt_valsize; 1707 optbuf = optbuf_storage; 1708 optp = &in6p->in6p_outputopts; 1709 error = ip6_pcbopt(optname, optbuf, optlen, 1710 optp, (td != NULL) ? td->td_ucred : NULL, 1711 uproto); 1712 break; 1713 } 1714 #undef OPTSET 1715 1716 case IPV6_MULTICAST_IF: 1717 case IPV6_MULTICAST_HOPS: 1718 case IPV6_MULTICAST_LOOP: 1719 case IPV6_JOIN_GROUP: 1720 case IPV6_LEAVE_GROUP: 1721 { 1722 if (sopt->sopt_valsize > MLEN) { 1723 error = EMSGSIZE; 1724 break; 1725 } 1726 /* XXX */ 1727 } 1728 /* FALLTHROUGH */ 1729 { 1730 struct mbuf *m; 1731 1732 if (sopt->sopt_valsize > MCLBYTES) { 1733 error = EMSGSIZE; 1734 break; 1735 } 1736 /* XXX */ 1737 MGET(m, sopt->sopt_td ? M_WAIT : M_DONTWAIT, MT_DATA); 1738 if (m == 0) { 1739 error = ENOBUFS; 1740 break; 1741 } 1742 if (sopt->sopt_valsize > MLEN) { 1743 MCLGET(m, sopt->sopt_td ? M_WAIT : M_DONTWAIT); 1744 if ((m->m_flags & M_EXT) == 0) { 1745 m_free(m); 1746 error = ENOBUFS; 1747 break; 1748 } 1749 } 1750 m->m_len = sopt->sopt_valsize; 1751 error = sooptcopyin(sopt, mtod(m, char *), 1752 m->m_len, m->m_len); 1753 if (error) { 1754 (void)m_free(m); 1755 break; 1756 } 1757 error = ip6_setmoptions(sopt->sopt_name, 1758 &in6p->in6p_moptions, 1759 m); 1760 (void)m_free(m); 1761 } 1762 break; 1763 1764 case IPV6_PORTRANGE: 1765 error = sooptcopyin(sopt, &optval, 1766 sizeof optval, sizeof optval); 1767 if (error) 1768 break; 1769 1770 switch (optval) { 1771 case IPV6_PORTRANGE_DEFAULT: 1772 in6p->inp_flags &= ~(INP_LOWPORT); 1773 in6p->inp_flags &= ~(INP_HIGHPORT); 1774 break; 1775 1776 case IPV6_PORTRANGE_HIGH: 1777 in6p->inp_flags &= ~(INP_LOWPORT); 1778 in6p->inp_flags |= INP_HIGHPORT; 1779 break; 1780 1781 case IPV6_PORTRANGE_LOW: 1782 in6p->inp_flags &= ~(INP_HIGHPORT); 1783 in6p->inp_flags |= INP_LOWPORT; 1784 break; 1785 1786 default: 1787 error = EINVAL; 1788 break; 1789 } 1790 break; 1791 1792 #ifdef IPSEC 1793 case IPV6_IPSEC_POLICY: 1794 { 1795 caddr_t req; 1796 struct mbuf *m; 1797 1798 if ((error = soopt_getm(sopt, &m)) != 0) /* XXX */ 1799 break; 1800 if ((error = soopt_mcopyin(sopt, m)) != 0) /* XXX */ 1801 break; 1802 req = mtod(m, caddr_t); 1803 error = ipsec_set_policy(in6p, optname, req, 1804 m->m_len, (sopt->sopt_td != NULL) ? 1805 sopt->sopt_td->td_ucred : NULL); 1806 m_freem(m); 1807 break; 1808 } 1809 #endif /* IPSEC */ 1810 1811 default: 1812 error = ENOPROTOOPT; 1813 break; 1814 } 1815 break; 1816 1817 case SOPT_GET: 1818 switch (optname) { 1819 1820 case IPV6_2292PKTOPTIONS: 1821 #ifdef IPV6_PKTOPTIONS 1822 case IPV6_PKTOPTIONS: 1823 #endif 1824 /* 1825 * RFC3542 (effectively) deprecated the 1826 * semantics of the 2292-style pktoptions. 1827 * Since it was not reliable in nature (i.e., 1828 * applications had to expect the lack of some 1829 * information after all), it would make sense 1830 * to simplify this part by always returning 1831 * empty data. 1832 */ 1833 sopt->sopt_valsize = 0; 1834 break; 1835 1836 case IPV6_RECVHOPOPTS: 1837 case IPV6_RECVDSTOPTS: 1838 case IPV6_RECVRTHDRDSTOPTS: 1839 case IPV6_UNICAST_HOPS: 1840 case IPV6_RECVPKTINFO: 1841 case IPV6_RECVHOPLIMIT: 1842 case IPV6_RECVRTHDR: 1843 case IPV6_RECVPATHMTU: 1844 1845 case IPV6_FAITH: 1846 case IPV6_V6ONLY: 1847 case IPV6_PORTRANGE: 1848 case IPV6_RECVTCLASS: 1849 case IPV6_AUTOFLOWLABEL: 1850 switch (optname) { 1851 1852 case IPV6_RECVHOPOPTS: 1853 optval = OPTBIT(IN6P_HOPOPTS); 1854 break; 1855 1856 case IPV6_RECVDSTOPTS: 1857 optval = OPTBIT(IN6P_DSTOPTS); 1858 break; 1859 1860 case IPV6_RECVRTHDRDSTOPTS: 1861 optval = OPTBIT(IN6P_RTHDRDSTOPTS); 1862 break; 1863 1864 case IPV6_UNICAST_HOPS: 1865 optval = in6p->in6p_hops; 1866 break; 1867 1868 case IPV6_RECVPKTINFO: 1869 optval = OPTBIT(IN6P_PKTINFO); 1870 break; 1871 1872 case IPV6_RECVHOPLIMIT: 1873 optval = OPTBIT(IN6P_HOPLIMIT); 1874 break; 1875 1876 case IPV6_RECVRTHDR: 1877 optval = OPTBIT(IN6P_RTHDR); 1878 break; 1879 1880 case IPV6_RECVPATHMTU: 1881 optval = OPTBIT(IN6P_MTU); 1882 break; 1883 1884 case IPV6_FAITH: 1885 optval = OPTBIT(INP_FAITH); 1886 break; 1887 1888 case IPV6_V6ONLY: 1889 optval = OPTBIT(IN6P_IPV6_V6ONLY); 1890 break; 1891 1892 case IPV6_PORTRANGE: 1893 { 1894 int flags; 1895 flags = in6p->inp_flags; 1896 if (flags & INP_HIGHPORT) 1897 optval = IPV6_PORTRANGE_HIGH; 1898 else if (flags & INP_LOWPORT) 1899 optval = IPV6_PORTRANGE_LOW; 1900 else 1901 optval = 0; 1902 break; 1903 } 1904 case IPV6_RECVTCLASS: 1905 optval = OPTBIT(IN6P_TCLASS); 1906 break; 1907 1908 case IPV6_AUTOFLOWLABEL: 1909 optval = OPTBIT(IN6P_AUTOFLOWLABEL); 1910 break; 1911 } 1912 if (error) 1913 break; 1914 error = sooptcopyout(sopt, &optval, 1915 sizeof optval); 1916 break; 1917 1918 case IPV6_PATHMTU: 1919 { 1920 u_long pmtu = 0; 1921 struct ip6_mtuinfo mtuinfo; 1922 struct route_in6 sro; 1923 1924 bzero(&sro, sizeof(sro)); 1925 1926 if (!(so->so_state & SS_ISCONNECTED)) 1927 return (ENOTCONN); 1928 /* 1929 * XXX: we dot not consider the case of source 1930 * routing, or optional information to specify 1931 * the outgoing interface. 1932 */ 1933 error = ip6_getpmtu(&sro, NULL, NULL, 1934 &in6p->in6p_faddr, &pmtu, NULL); 1935 if (sro.ro_rt) 1936 RTFREE(sro.ro_rt); 1937 if (error) 1938 break; 1939 if (pmtu > IPV6_MAXPACKET) 1940 pmtu = IPV6_MAXPACKET; 1941 1942 bzero(&mtuinfo, sizeof(mtuinfo)); 1943 mtuinfo.ip6m_mtu = (u_int32_t)pmtu; 1944 optdata = (void *)&mtuinfo; 1945 optdatalen = sizeof(mtuinfo); 1946 error = sooptcopyout(sopt, optdata, 1947 optdatalen); 1948 break; 1949 } 1950 1951 case IPV6_2292PKTINFO: 1952 case IPV6_2292HOPLIMIT: 1953 case IPV6_2292HOPOPTS: 1954 case IPV6_2292RTHDR: 1955 case IPV6_2292DSTOPTS: 1956 switch (optname) { 1957 case IPV6_2292PKTINFO: 1958 optval = OPTBIT(IN6P_PKTINFO); 1959 break; 1960 case IPV6_2292HOPLIMIT: 1961 optval = OPTBIT(IN6P_HOPLIMIT); 1962 break; 1963 case IPV6_2292HOPOPTS: 1964 optval = OPTBIT(IN6P_HOPOPTS); 1965 break; 1966 case IPV6_2292RTHDR: 1967 optval = OPTBIT(IN6P_RTHDR); 1968 break; 1969 case IPV6_2292DSTOPTS: 1970 optval = OPTBIT(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); 1971 break; 1972 } 1973 error = sooptcopyout(sopt, &optval, 1974 sizeof optval); 1975 break; 1976 case IPV6_PKTINFO: 1977 case IPV6_HOPOPTS: 1978 case IPV6_RTHDR: 1979 case IPV6_DSTOPTS: 1980 case IPV6_RTHDRDSTOPTS: 1981 case IPV6_NEXTHOP: 1982 case IPV6_TCLASS: 1983 case IPV6_DONTFRAG: 1984 case IPV6_USE_MIN_MTU: 1985 case IPV6_PREFER_TEMPADDR: 1986 error = ip6_getpcbopt(in6p->in6p_outputopts, 1987 optname, sopt); 1988 break; 1989 1990 case IPV6_MULTICAST_IF: 1991 case IPV6_MULTICAST_HOPS: 1992 case IPV6_MULTICAST_LOOP: 1993 case IPV6_JOIN_GROUP: 1994 case IPV6_LEAVE_GROUP: 1995 { 1996 struct mbuf *m; 1997 error = ip6_getmoptions(sopt->sopt_name, 1998 in6p->in6p_moptions, &m); 1999 if (error == 0) 2000 error = sooptcopyout(sopt, 2001 mtod(m, char *), m->m_len); 2002 m_freem(m); 2003 } 2004 break; 2005 2006 #ifdef IPSEC 2007 case IPV6_IPSEC_POLICY: 2008 { 2009 caddr_t req = NULL; 2010 size_t len = 0; 2011 struct mbuf *m = NULL; 2012 struct mbuf **mp = &m; 2013 size_t ovalsize = sopt->sopt_valsize; 2014 caddr_t oval = (caddr_t)sopt->sopt_val; 2015 2016 error = soopt_getm(sopt, &m); /* XXX */ 2017 if (error != 0) 2018 break; 2019 error = soopt_mcopyin(sopt, m); /* XXX */ 2020 if (error != 0) 2021 break; 2022 sopt->sopt_valsize = ovalsize; 2023 sopt->sopt_val = oval; 2024 if (m) { 2025 req = mtod(m, caddr_t); 2026 len = m->m_len; 2027 } 2028 error = ipsec_get_policy(in6p, req, len, mp); 2029 if (error == 0) 2030 error = soopt_mcopyout(sopt, m); /* XXX */ 2031 if (error == 0 && m) 2032 m_freem(m); 2033 break; 2034 } 2035 #endif /* IPSEC */ 2036 2037 default: 2038 error = ENOPROTOOPT; 2039 break; 2040 } 2041 break; 2042 } 2043 } else { /* level != IPPROTO_IPV6 */ 2044 error = EINVAL; 2045 } 2046 return (error); 2047 } 2048 2049 int 2050 ip6_raw_ctloutput(struct socket *so, struct sockopt *sopt) 2051 { 2052 int error = 0, optval, optlen; 2053 const int icmp6off = offsetof(struct icmp6_hdr, icmp6_cksum); 2054 struct inpcb *in6p = sotoinpcb(so); 2055 int level, op, optname; 2056 2057 level = sopt->sopt_level; 2058 op = sopt->sopt_dir; 2059 optname = sopt->sopt_name; 2060 optlen = sopt->sopt_valsize; 2061 2062 if (level != IPPROTO_IPV6) { 2063 return (EINVAL); 2064 } 2065 2066 switch (optname) { 2067 case IPV6_CHECKSUM: 2068 /* 2069 * For ICMPv6 sockets, no modification allowed for checksum 2070 * offset, permit "no change" values to help existing apps. 2071 * 2072 * RFC3542 says: "An attempt to set IPV6_CHECKSUM 2073 * for an ICMPv6 socket will fail." 2074 * The current behavior does not meet RFC3542. 2075 */ 2076 switch (op) { 2077 case SOPT_SET: 2078 if (optlen != sizeof(int)) { 2079 error = EINVAL; 2080 break; 2081 } 2082 error = sooptcopyin(sopt, &optval, sizeof(optval), 2083 sizeof(optval)); 2084 if (error) 2085 break; 2086 if ((optval % 2) != 0) { 2087 /* the API assumes even offset values */ 2088 error = EINVAL; 2089 } else if (so->so_proto->pr_protocol == 2090 IPPROTO_ICMPV6) { 2091 if (optval != icmp6off) 2092 error = EINVAL; 2093 } else 2094 in6p->in6p_cksum = optval; 2095 break; 2096 2097 case SOPT_GET: 2098 if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) 2099 optval = icmp6off; 2100 else 2101 optval = in6p->in6p_cksum; 2102 2103 error = sooptcopyout(sopt, &optval, sizeof(optval)); 2104 break; 2105 2106 default: 2107 error = EINVAL; 2108 break; 2109 } 2110 break; 2111 2112 default: 2113 error = ENOPROTOOPT; 2114 break; 2115 } 2116 2117 return (error); 2118 } 2119 2120 /* 2121 * Set up IP6 options in pcb for insertion in output packets or 2122 * specifying behavior of outgoing packets. 2123 */ 2124 static int 2125 ip6_pcbopts(struct ip6_pktopts **pktopt, struct mbuf *m, 2126 struct socket *so, struct sockopt *sopt) 2127 { 2128 struct ip6_pktopts *opt = *pktopt; 2129 int error = 0; 2130 struct thread *td = sopt->sopt_td; 2131 2132 /* turn off any old options. */ 2133 if (opt) { 2134 #ifdef DIAGNOSTIC 2135 if (opt->ip6po_pktinfo || opt->ip6po_nexthop || 2136 opt->ip6po_hbh || opt->ip6po_dest1 || opt->ip6po_dest2 || 2137 opt->ip6po_rhinfo.ip6po_rhi_rthdr) 2138 printf("ip6_pcbopts: all specified options are cleared.\n"); 2139 #endif 2140 ip6_clearpktopts(opt, -1); 2141 } else 2142 opt = malloc(sizeof(*opt), M_IP6OPT, M_WAITOK); 2143 *pktopt = NULL; 2144 2145 if (!m || m->m_len == 0) { 2146 /* 2147 * Only turning off any previous options, regardless of 2148 * whether the opt is just created or given. 2149 */ 2150 free(opt, M_IP6OPT); 2151 return (0); 2152 } 2153 2154 /* set options specified by user. */ 2155 if ((error = ip6_setpktopts(m, opt, NULL, (td != NULL) ? 2156 td->td_ucred : NULL, so->so_proto->pr_protocol)) != 0) { 2157 ip6_clearpktopts(opt, -1); /* XXX: discard all options */ 2158 free(opt, M_IP6OPT); 2159 return (error); 2160 } 2161 *pktopt = opt; 2162 return (0); 2163 } 2164 2165 /* 2166 * initialize ip6_pktopts. beware that there are non-zero default values in 2167 * the struct. 2168 */ 2169 void 2170 ip6_initpktopts(struct ip6_pktopts *opt) 2171 { 2172 2173 bzero(opt, sizeof(*opt)); 2174 opt->ip6po_hlim = -1; /* -1 means default hop limit */ 2175 opt->ip6po_tclass = -1; /* -1 means default traffic class */ 2176 opt->ip6po_minmtu = IP6PO_MINMTU_MCASTONLY; 2177 opt->ip6po_prefer_tempaddr = IP6PO_TEMPADDR_SYSTEM; 2178 } 2179 2180 static int 2181 ip6_pcbopt(int optname, u_char *buf, int len, struct ip6_pktopts **pktopt, 2182 struct ucred *cred, int uproto) 2183 { 2184 struct ip6_pktopts *opt; 2185 2186 if (*pktopt == NULL) { 2187 *pktopt = malloc(sizeof(struct ip6_pktopts), M_IP6OPT, 2188 M_WAITOK); 2189 ip6_initpktopts(*pktopt); 2190 } 2191 opt = *pktopt; 2192 2193 return (ip6_setpktopt(optname, buf, len, opt, cred, 1, 0, uproto)); 2194 } 2195 2196 static int 2197 ip6_getpcbopt(struct ip6_pktopts *pktopt, int optname, struct sockopt *sopt) 2198 { 2199 void *optdata = NULL; 2200 int optdatalen = 0; 2201 struct ip6_ext *ip6e; 2202 int error = 0; 2203 struct in6_pktinfo null_pktinfo; 2204 int deftclass = 0, on; 2205 int defminmtu = IP6PO_MINMTU_MCASTONLY; 2206 int defpreftemp = IP6PO_TEMPADDR_SYSTEM; 2207 2208 switch (optname) { 2209 case IPV6_PKTINFO: 2210 if (pktopt && pktopt->ip6po_pktinfo) 2211 optdata = (void *)pktopt->ip6po_pktinfo; 2212 else { 2213 /* XXX: we don't have to do this every time... */ 2214 bzero(&null_pktinfo, sizeof(null_pktinfo)); 2215 optdata = (void *)&null_pktinfo; 2216 } 2217 optdatalen = sizeof(struct in6_pktinfo); 2218 break; 2219 case IPV6_TCLASS: 2220 if (pktopt && pktopt->ip6po_tclass >= 0) 2221 optdata = (void *)&pktopt->ip6po_tclass; 2222 else 2223 optdata = (void *)&deftclass; 2224 optdatalen = sizeof(int); 2225 break; 2226 case IPV6_HOPOPTS: 2227 if (pktopt && pktopt->ip6po_hbh) { 2228 optdata = (void *)pktopt->ip6po_hbh; 2229 ip6e = (struct ip6_ext *)pktopt->ip6po_hbh; 2230 optdatalen = (ip6e->ip6e_len + 1) << 3; 2231 } 2232 break; 2233 case IPV6_RTHDR: 2234 if (pktopt && pktopt->ip6po_rthdr) { 2235 optdata = (void *)pktopt->ip6po_rthdr; 2236 ip6e = (struct ip6_ext *)pktopt->ip6po_rthdr; 2237 optdatalen = (ip6e->ip6e_len + 1) << 3; 2238 } 2239 break; 2240 case IPV6_RTHDRDSTOPTS: 2241 if (pktopt && pktopt->ip6po_dest1) { 2242 optdata = (void *)pktopt->ip6po_dest1; 2243 ip6e = (struct ip6_ext *)pktopt->ip6po_dest1; 2244 optdatalen = (ip6e->ip6e_len + 1) << 3; 2245 } 2246 break; 2247 case IPV6_DSTOPTS: 2248 if (pktopt && pktopt->ip6po_dest2) { 2249 optdata = (void *)pktopt->ip6po_dest2; 2250 ip6e = (struct ip6_ext *)pktopt->ip6po_dest2; 2251 optdatalen = (ip6e->ip6e_len + 1) << 3; 2252 } 2253 break; 2254 case IPV6_NEXTHOP: 2255 if (pktopt && pktopt->ip6po_nexthop) { 2256 optdata = (void *)pktopt->ip6po_nexthop; 2257 optdatalen = pktopt->ip6po_nexthop->sa_len; 2258 } 2259 break; 2260 case IPV6_USE_MIN_MTU: 2261 if (pktopt) 2262 optdata = (void *)&pktopt->ip6po_minmtu; 2263 else 2264 optdata = (void *)&defminmtu; 2265 optdatalen = sizeof(int); 2266 break; 2267 case IPV6_DONTFRAG: 2268 if (pktopt && ((pktopt->ip6po_flags) & IP6PO_DONTFRAG)) 2269 on = 1; 2270 else 2271 on = 0; 2272 optdata = (void *)&on; 2273 optdatalen = sizeof(on); 2274 break; 2275 case IPV6_PREFER_TEMPADDR: 2276 if (pktopt) 2277 optdata = (void *)&pktopt->ip6po_prefer_tempaddr; 2278 else 2279 optdata = (void *)&defpreftemp; 2280 optdatalen = sizeof(int); 2281 break; 2282 default: /* should not happen */ 2283 #ifdef DIAGNOSTIC 2284 panic("ip6_getpcbopt: unexpected option\n"); 2285 #endif 2286 return (ENOPROTOOPT); 2287 } 2288 2289 error = sooptcopyout(sopt, optdata, optdatalen); 2290 2291 return (error); 2292 } 2293 2294 void 2295 ip6_clearpktopts(struct ip6_pktopts *pktopt, int optname) 2296 { 2297 if (pktopt == NULL) 2298 return; 2299 2300 if (optname == -1 || optname == IPV6_PKTINFO) { 2301 if (pktopt->ip6po_pktinfo) 2302 free(pktopt->ip6po_pktinfo, M_IP6OPT); 2303 pktopt->ip6po_pktinfo = NULL; 2304 } 2305 if (optname == -1 || optname == IPV6_HOPLIMIT) 2306 pktopt->ip6po_hlim = -1; 2307 if (optname == -1 || optname == IPV6_TCLASS) 2308 pktopt->ip6po_tclass = -1; 2309 if (optname == -1 || optname == IPV6_NEXTHOP) { 2310 if (pktopt->ip6po_nextroute.ro_rt) { 2311 RTFREE(pktopt->ip6po_nextroute.ro_rt); 2312 pktopt->ip6po_nextroute.ro_rt = NULL; 2313 } 2314 if (pktopt->ip6po_nexthop) 2315 free(pktopt->ip6po_nexthop, M_IP6OPT); 2316 pktopt->ip6po_nexthop = NULL; 2317 } 2318 if (optname == -1 || optname == IPV6_HOPOPTS) { 2319 if (pktopt->ip6po_hbh) 2320 free(pktopt->ip6po_hbh, M_IP6OPT); 2321 pktopt->ip6po_hbh = NULL; 2322 } 2323 if (optname == -1 || optname == IPV6_RTHDRDSTOPTS) { 2324 if (pktopt->ip6po_dest1) 2325 free(pktopt->ip6po_dest1, M_IP6OPT); 2326 pktopt->ip6po_dest1 = NULL; 2327 } 2328 if (optname == -1 || optname == IPV6_RTHDR) { 2329 if (pktopt->ip6po_rhinfo.ip6po_rhi_rthdr) 2330 free(pktopt->ip6po_rhinfo.ip6po_rhi_rthdr, M_IP6OPT); 2331 pktopt->ip6po_rhinfo.ip6po_rhi_rthdr = NULL; 2332 if (pktopt->ip6po_route.ro_rt) { 2333 RTFREE(pktopt->ip6po_route.ro_rt); 2334 pktopt->ip6po_route.ro_rt = NULL; 2335 } 2336 } 2337 if (optname == -1 || optname == IPV6_DSTOPTS) { 2338 if (pktopt->ip6po_dest2) 2339 free(pktopt->ip6po_dest2, M_IP6OPT); 2340 pktopt->ip6po_dest2 = NULL; 2341 } 2342 } 2343 2344 #define PKTOPT_EXTHDRCPY(type) \ 2345 do {\ 2346 if (src->type) {\ 2347 int hlen = (((struct ip6_ext *)src->type)->ip6e_len + 1) << 3;\ 2348 dst->type = malloc(hlen, M_IP6OPT, canwait);\ 2349 if (dst->type == NULL && canwait == M_NOWAIT)\ 2350 goto bad;\ 2351 bcopy(src->type, dst->type, hlen);\ 2352 }\ 2353 } while (/*CONSTCOND*/ 0) 2354 2355 static int 2356 copypktopts(struct ip6_pktopts *dst, struct ip6_pktopts *src, int canwait) 2357 { 2358 if (dst == NULL || src == NULL) { 2359 printf("ip6_clearpktopts: invalid argument\n"); 2360 return (EINVAL); 2361 } 2362 2363 dst->ip6po_hlim = src->ip6po_hlim; 2364 dst->ip6po_tclass = src->ip6po_tclass; 2365 dst->ip6po_flags = src->ip6po_flags; 2366 if (src->ip6po_pktinfo) { 2367 dst->ip6po_pktinfo = malloc(sizeof(*dst->ip6po_pktinfo), 2368 M_IP6OPT, canwait); 2369 if (dst->ip6po_pktinfo == NULL) 2370 goto bad; 2371 *dst->ip6po_pktinfo = *src->ip6po_pktinfo; 2372 } 2373 if (src->ip6po_nexthop) { 2374 dst->ip6po_nexthop = malloc(src->ip6po_nexthop->sa_len, 2375 M_IP6OPT, canwait); 2376 if (dst->ip6po_nexthop == NULL) 2377 goto bad; 2378 bcopy(src->ip6po_nexthop, dst->ip6po_nexthop, 2379 src->ip6po_nexthop->sa_len); 2380 } 2381 PKTOPT_EXTHDRCPY(ip6po_hbh); 2382 PKTOPT_EXTHDRCPY(ip6po_dest1); 2383 PKTOPT_EXTHDRCPY(ip6po_dest2); 2384 PKTOPT_EXTHDRCPY(ip6po_rthdr); /* not copy the cached route */ 2385 return (0); 2386 2387 bad: 2388 ip6_clearpktopts(dst, -1); 2389 return (ENOBUFS); 2390 } 2391 #undef PKTOPT_EXTHDRCPY 2392 2393 struct ip6_pktopts * 2394 ip6_copypktopts(struct ip6_pktopts *src, int canwait) 2395 { 2396 int error; 2397 struct ip6_pktopts *dst; 2398 2399 dst = malloc(sizeof(*dst), M_IP6OPT, canwait); 2400 if (dst == NULL) 2401 return (NULL); 2402 ip6_initpktopts(dst); 2403 2404 if ((error = copypktopts(dst, src, canwait)) != 0) { 2405 free(dst, M_IP6OPT); 2406 return (NULL); 2407 } 2408 2409 return (dst); 2410 } 2411 2412 void 2413 ip6_freepcbopts(struct ip6_pktopts *pktopt) 2414 { 2415 if (pktopt == NULL) 2416 return; 2417 2418 ip6_clearpktopts(pktopt, -1); 2419 2420 free(pktopt, M_IP6OPT); 2421 } 2422 2423 /* 2424 * Set the IP6 multicast options in response to user setsockopt(). 2425 */ 2426 static int 2427 ip6_setmoptions(int optname, struct ip6_moptions **im6op, struct mbuf *m) 2428 { 2429 INIT_VNET_NET(curvnet); 2430 INIT_VNET_INET6(curvnet); 2431 int error = 0; 2432 u_int loop, ifindex; 2433 struct ipv6_mreq *mreq; 2434 struct ifnet *ifp; 2435 struct ip6_moptions *im6o = *im6op; 2436 struct route_in6 ro; 2437 struct in6_multi_mship *imm; 2438 2439 if (im6o == NULL) { 2440 /* 2441 * No multicast option buffer attached to the pcb; 2442 * allocate one and initialize to default values. 2443 */ 2444 im6o = (struct ip6_moptions *) 2445 malloc(sizeof(*im6o), M_IP6MOPTS, M_WAITOK); 2446 2447 if (im6o == NULL) 2448 return (ENOBUFS); 2449 *im6op = im6o; 2450 im6o->im6o_multicast_ifp = NULL; 2451 im6o->im6o_multicast_hlim = V_ip6_defmcasthlim; 2452 im6o->im6o_multicast_loop = IPV6_DEFAULT_MULTICAST_LOOP; 2453 LIST_INIT(&im6o->im6o_memberships); 2454 } 2455 2456 switch (optname) { 2457 2458 case IPV6_MULTICAST_IF: 2459 /* 2460 * Select the interface for outgoing multicast packets. 2461 */ 2462 if (m == NULL || m->m_len != sizeof(u_int)) { 2463 error = EINVAL; 2464 break; 2465 } 2466 bcopy(mtod(m, u_int *), &ifindex, sizeof(ifindex)); 2467 if (ifindex < 0 || V_if_index < ifindex) { 2468 error = ENXIO; /* XXX EINVAL? */ 2469 break; 2470 } 2471 ifp = ifnet_byindex(ifindex); 2472 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0) { 2473 error = EADDRNOTAVAIL; 2474 break; 2475 } 2476 im6o->im6o_multicast_ifp = ifp; 2477 break; 2478 2479 case IPV6_MULTICAST_HOPS: 2480 { 2481 /* 2482 * Set the IP6 hoplimit for outgoing multicast packets. 2483 */ 2484 int optval; 2485 if (m == NULL || m->m_len != sizeof(int)) { 2486 error = EINVAL; 2487 break; 2488 } 2489 bcopy(mtod(m, u_int *), &optval, sizeof(optval)); 2490 if (optval < -1 || optval >= 256) 2491 error = EINVAL; 2492 else if (optval == -1) 2493 im6o->im6o_multicast_hlim = V_ip6_defmcasthlim; 2494 else 2495 im6o->im6o_multicast_hlim = optval; 2496 break; 2497 } 2498 2499 case IPV6_MULTICAST_LOOP: 2500 /* 2501 * Set the loopback flag for outgoing multicast packets. 2502 * Must be zero or one. 2503 */ 2504 if (m == NULL || m->m_len != sizeof(u_int)) { 2505 error = EINVAL; 2506 break; 2507 } 2508 bcopy(mtod(m, u_int *), &loop, sizeof(loop)); 2509 if (loop > 1) { 2510 error = EINVAL; 2511 break; 2512 } 2513 im6o->im6o_multicast_loop = loop; 2514 break; 2515 2516 case IPV6_JOIN_GROUP: 2517 /* 2518 * Add a multicast group membership. 2519 * Group must be a valid IP6 multicast address. 2520 */ 2521 if (m == NULL || m->m_len != sizeof(struct ipv6_mreq)) { 2522 error = EINVAL; 2523 break; 2524 } 2525 mreq = mtod(m, struct ipv6_mreq *); 2526 2527 if (IN6_IS_ADDR_UNSPECIFIED(&mreq->ipv6mr_multiaddr)) { 2528 /* 2529 * We use the unspecified address to specify to accept 2530 * all multicast addresses. Only super user is allowed 2531 * to do this. 2532 */ 2533 /* XXX-BZ might need a better PRIV_NETINET_x for this */ 2534 error = priv_check(curthread, PRIV_NETINET_MROUTE); 2535 if (error) 2536 break; 2537 } else if (!IN6_IS_ADDR_MULTICAST(&mreq->ipv6mr_multiaddr)) { 2538 error = EINVAL; 2539 break; 2540 } 2541 2542 /* 2543 * If no interface was explicitly specified, choose an 2544 * appropriate one according to the given multicast address. 2545 */ 2546 if (mreq->ipv6mr_interface == 0) { 2547 struct sockaddr_in6 *dst; 2548 2549 /* 2550 * Look up the routing table for the 2551 * address, and choose the outgoing interface. 2552 * XXX: is it a good approach? 2553 */ 2554 ro.ro_rt = NULL; 2555 dst = (struct sockaddr_in6 *)&ro.ro_dst; 2556 bzero(dst, sizeof(*dst)); 2557 dst->sin6_family = AF_INET6; 2558 dst->sin6_len = sizeof(*dst); 2559 dst->sin6_addr = mreq->ipv6mr_multiaddr; 2560 rtalloc((struct route *)&ro); 2561 if (ro.ro_rt == NULL) { 2562 error = EADDRNOTAVAIL; 2563 break; 2564 } 2565 ifp = ro.ro_rt->rt_ifp; 2566 RTFREE(ro.ro_rt); 2567 } else { 2568 /* 2569 * If the interface is specified, validate it. 2570 */ 2571 if (mreq->ipv6mr_interface < 0 || 2572 V_if_index < mreq->ipv6mr_interface) { 2573 error = ENXIO; /* XXX EINVAL? */ 2574 break; 2575 } 2576 ifp = ifnet_byindex(mreq->ipv6mr_interface); 2577 if (!ifp) { 2578 error = ENXIO; /* XXX EINVAL? */ 2579 break; 2580 } 2581 } 2582 2583 /* 2584 * See if we found an interface, and confirm that it 2585 * supports multicast 2586 */ 2587 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0) { 2588 error = EADDRNOTAVAIL; 2589 break; 2590 } 2591 2592 if (in6_setscope(&mreq->ipv6mr_multiaddr, ifp, NULL)) { 2593 error = EADDRNOTAVAIL; /* XXX: should not happen */ 2594 break; 2595 } 2596 2597 /* 2598 * See if the membership already exists. 2599 */ 2600 for (imm = im6o->im6o_memberships.lh_first; 2601 imm != NULL; imm = imm->i6mm_chain.le_next) 2602 if (imm->i6mm_maddr->in6m_ifp == ifp && 2603 IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr, 2604 &mreq->ipv6mr_multiaddr)) 2605 break; 2606 if (imm != NULL) { 2607 error = EADDRINUSE; 2608 break; 2609 } 2610 /* 2611 * Everything looks good; add a new record to the multicast 2612 * address list for the given interface. 2613 */ 2614 imm = in6_joingroup(ifp, &mreq->ipv6mr_multiaddr, &error, 0); 2615 if (imm == NULL) 2616 break; 2617 LIST_INSERT_HEAD(&im6o->im6o_memberships, imm, i6mm_chain); 2618 break; 2619 2620 case IPV6_LEAVE_GROUP: 2621 /* 2622 * Drop a multicast group membership. 2623 * Group must be a valid IP6 multicast address. 2624 */ 2625 if (m == NULL || m->m_len != sizeof(struct ipv6_mreq)) { 2626 error = EINVAL; 2627 break; 2628 } 2629 mreq = mtod(m, struct ipv6_mreq *); 2630 2631 /* 2632 * If an interface address was specified, get a pointer 2633 * to its ifnet structure. 2634 */ 2635 if (mreq->ipv6mr_interface < 0 || 2636 V_if_index < mreq->ipv6mr_interface) { 2637 error = ENXIO; /* XXX EINVAL? */ 2638 break; 2639 } 2640 if (mreq->ipv6mr_interface == 0) 2641 ifp = NULL; 2642 else 2643 ifp = ifnet_byindex(mreq->ipv6mr_interface); 2644 2645 /* Fill in the scope zone ID */ 2646 if (ifp) { 2647 if (in6_setscope(&mreq->ipv6mr_multiaddr, ifp, NULL)) { 2648 /* XXX: should not happen */ 2649 error = EADDRNOTAVAIL; 2650 break; 2651 } 2652 } else if (mreq->ipv6mr_interface != 0) { 2653 /* 2654 * This case happens when the (positive) index is in 2655 * the valid range, but the corresponding interface has 2656 * been detached dynamically (XXX). 2657 */ 2658 error = EADDRNOTAVAIL; 2659 break; 2660 } else { /* ipv6mr_interface == 0 */ 2661 struct sockaddr_in6 sa6_mc; 2662 2663 /* 2664 * The API spec says as follows: 2665 * If the interface index is specified as 0, the 2666 * system may choose a multicast group membership to 2667 * drop by matching the multicast address only. 2668 * On the other hand, we cannot disambiguate the scope 2669 * zone unless an interface is provided. Thus, we 2670 * check if there's ambiguity with the default scope 2671 * zone as the last resort. 2672 */ 2673 bzero(&sa6_mc, sizeof(sa6_mc)); 2674 sa6_mc.sin6_family = AF_INET6; 2675 sa6_mc.sin6_len = sizeof(sa6_mc); 2676 sa6_mc.sin6_addr = mreq->ipv6mr_multiaddr; 2677 error = sa6_embedscope(&sa6_mc, V_ip6_use_defzone); 2678 if (error != 0) 2679 break; 2680 mreq->ipv6mr_multiaddr = sa6_mc.sin6_addr; 2681 } 2682 2683 /* 2684 * Find the membership in the membership list. 2685 */ 2686 for (imm = im6o->im6o_memberships.lh_first; 2687 imm != NULL; imm = imm->i6mm_chain.le_next) { 2688 if ((ifp == NULL || imm->i6mm_maddr->in6m_ifp == ifp) && 2689 IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr, 2690 &mreq->ipv6mr_multiaddr)) 2691 break; 2692 } 2693 if (imm == NULL) { 2694 /* Unable to resolve interface */ 2695 error = EADDRNOTAVAIL; 2696 break; 2697 } 2698 /* 2699 * Give up the multicast address record to which the 2700 * membership points. 2701 */ 2702 LIST_REMOVE(imm, i6mm_chain); 2703 in6_delmulti(imm->i6mm_maddr); 2704 free(imm, M_IP6MADDR); 2705 break; 2706 2707 default: 2708 error = EOPNOTSUPP; 2709 break; 2710 } 2711 2712 /* 2713 * If all options have default values, no need to keep the mbuf. 2714 */ 2715 if (im6o->im6o_multicast_ifp == NULL && 2716 im6o->im6o_multicast_hlim == V_ip6_defmcasthlim && 2717 im6o->im6o_multicast_loop == IPV6_DEFAULT_MULTICAST_LOOP && 2718 im6o->im6o_memberships.lh_first == NULL) { 2719 free(*im6op, M_IP6MOPTS); 2720 *im6op = NULL; 2721 } 2722 2723 return (error); 2724 } 2725 2726 /* 2727 * Return the IP6 multicast options in response to user getsockopt(). 2728 */ 2729 static int 2730 ip6_getmoptions(int optname, struct ip6_moptions *im6o, struct mbuf **mp) 2731 { 2732 INIT_VNET_INET6(curvnet); 2733 u_int *hlim, *loop, *ifindex; 2734 2735 *mp = m_get(M_WAIT, MT_HEADER); /* XXX */ 2736 2737 switch (optname) { 2738 2739 case IPV6_MULTICAST_IF: 2740 ifindex = mtod(*mp, u_int *); 2741 (*mp)->m_len = sizeof(u_int); 2742 if (im6o == NULL || im6o->im6o_multicast_ifp == NULL) 2743 *ifindex = 0; 2744 else 2745 *ifindex = im6o->im6o_multicast_ifp->if_index; 2746 return (0); 2747 2748 case IPV6_MULTICAST_HOPS: 2749 hlim = mtod(*mp, u_int *); 2750 (*mp)->m_len = sizeof(u_int); 2751 if (im6o == NULL) 2752 *hlim = V_ip6_defmcasthlim; 2753 else 2754 *hlim = im6o->im6o_multicast_hlim; 2755 return (0); 2756 2757 case IPV6_MULTICAST_LOOP: 2758 loop = mtod(*mp, u_int *); 2759 (*mp)->m_len = sizeof(u_int); 2760 if (im6o == NULL) 2761 *loop = V_ip6_defmcasthlim; 2762 else 2763 *loop = im6o->im6o_multicast_loop; 2764 return (0); 2765 2766 default: 2767 return (EOPNOTSUPP); 2768 } 2769 } 2770 2771 /* 2772 * Discard the IP6 multicast options. 2773 */ 2774 void 2775 ip6_freemoptions(struct ip6_moptions *im6o) 2776 { 2777 struct in6_multi_mship *imm; 2778 2779 if (im6o == NULL) 2780 return; 2781 2782 while ((imm = im6o->im6o_memberships.lh_first) != NULL) { 2783 LIST_REMOVE(imm, i6mm_chain); 2784 if (imm->i6mm_maddr) 2785 in6_delmulti(imm->i6mm_maddr); 2786 free(imm, M_IP6MADDR); 2787 } 2788 free(im6o, M_IP6MOPTS); 2789 } 2790 2791 /* 2792 * Set IPv6 outgoing packet options based on advanced API. 2793 */ 2794 int 2795 ip6_setpktopts(struct mbuf *control, struct ip6_pktopts *opt, 2796 struct ip6_pktopts *stickyopt, struct ucred *cred, int uproto) 2797 { 2798 struct cmsghdr *cm = 0; 2799 2800 if (control == NULL || opt == NULL) 2801 return (EINVAL); 2802 2803 ip6_initpktopts(opt); 2804 if (stickyopt) { 2805 int error; 2806 2807 /* 2808 * If stickyopt is provided, make a local copy of the options 2809 * for this particular packet, then override them by ancillary 2810 * objects. 2811 * XXX: copypktopts() does not copy the cached route to a next 2812 * hop (if any). This is not very good in terms of efficiency, 2813 * but we can allow this since this option should be rarely 2814 * used. 2815 */ 2816 if ((error = copypktopts(opt, stickyopt, M_NOWAIT)) != 0) 2817 return (error); 2818 } 2819 2820 /* 2821 * XXX: Currently, we assume all the optional information is stored 2822 * in a single mbuf. 2823 */ 2824 if (control->m_next) 2825 return (EINVAL); 2826 2827 for (; control->m_len > 0; control->m_data += CMSG_ALIGN(cm->cmsg_len), 2828 control->m_len -= CMSG_ALIGN(cm->cmsg_len)) { 2829 int error; 2830 2831 if (control->m_len < CMSG_LEN(0)) 2832 return (EINVAL); 2833 2834 cm = mtod(control, struct cmsghdr *); 2835 if (cm->cmsg_len == 0 || cm->cmsg_len > control->m_len) 2836 return (EINVAL); 2837 if (cm->cmsg_level != IPPROTO_IPV6) 2838 continue; 2839 2840 error = ip6_setpktopt(cm->cmsg_type, CMSG_DATA(cm), 2841 cm->cmsg_len - CMSG_LEN(0), opt, cred, 0, 1, uproto); 2842 if (error) 2843 return (error); 2844 } 2845 2846 return (0); 2847 } 2848 2849 /* 2850 * Set a particular packet option, as a sticky option or an ancillary data 2851 * item. "len" can be 0 only when it's a sticky option. 2852 * We have 4 cases of combination of "sticky" and "cmsg": 2853 * "sticky=0, cmsg=0": impossible 2854 * "sticky=0, cmsg=1": RFC2292 or RFC3542 ancillary data 2855 * "sticky=1, cmsg=0": RFC3542 socket option 2856 * "sticky=1, cmsg=1": RFC2292 socket option 2857 */ 2858 static int 2859 ip6_setpktopt(int optname, u_char *buf, int len, struct ip6_pktopts *opt, 2860 struct ucred *cred, int sticky, int cmsg, int uproto) 2861 { 2862 INIT_VNET_NET(curvnet); 2863 INIT_VNET_INET6(curvnet); 2864 int minmtupolicy, preftemp; 2865 int error; 2866 2867 if (!sticky && !cmsg) { 2868 #ifdef DIAGNOSTIC 2869 printf("ip6_setpktopt: impossible case\n"); 2870 #endif 2871 return (EINVAL); 2872 } 2873 2874 /* 2875 * IPV6_2292xxx is for backward compatibility to RFC2292, and should 2876 * not be specified in the context of RFC3542. Conversely, 2877 * RFC3542 types should not be specified in the context of RFC2292. 2878 */ 2879 if (!cmsg) { 2880 switch (optname) { 2881 case IPV6_2292PKTINFO: 2882 case IPV6_2292HOPLIMIT: 2883 case IPV6_2292NEXTHOP: 2884 case IPV6_2292HOPOPTS: 2885 case IPV6_2292DSTOPTS: 2886 case IPV6_2292RTHDR: 2887 case IPV6_2292PKTOPTIONS: 2888 return (ENOPROTOOPT); 2889 } 2890 } 2891 if (sticky && cmsg) { 2892 switch (optname) { 2893 case IPV6_PKTINFO: 2894 case IPV6_HOPLIMIT: 2895 case IPV6_NEXTHOP: 2896 case IPV6_HOPOPTS: 2897 case IPV6_DSTOPTS: 2898 case IPV6_RTHDRDSTOPTS: 2899 case IPV6_RTHDR: 2900 case IPV6_USE_MIN_MTU: 2901 case IPV6_DONTFRAG: 2902 case IPV6_TCLASS: 2903 case IPV6_PREFER_TEMPADDR: /* XXX: not an RFC3542 option */ 2904 return (ENOPROTOOPT); 2905 } 2906 } 2907 2908 switch (optname) { 2909 case IPV6_2292PKTINFO: 2910 case IPV6_PKTINFO: 2911 { 2912 struct ifnet *ifp = NULL; 2913 struct in6_pktinfo *pktinfo; 2914 2915 if (len != sizeof(struct in6_pktinfo)) 2916 return (EINVAL); 2917 2918 pktinfo = (struct in6_pktinfo *)buf; 2919 2920 /* 2921 * An application can clear any sticky IPV6_PKTINFO option by 2922 * doing a "regular" setsockopt with ipi6_addr being 2923 * in6addr_any and ipi6_ifindex being zero. 2924 * [RFC 3542, Section 6] 2925 */ 2926 if (optname == IPV6_PKTINFO && opt->ip6po_pktinfo && 2927 pktinfo->ipi6_ifindex == 0 && 2928 IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) { 2929 ip6_clearpktopts(opt, optname); 2930 break; 2931 } 2932 2933 if (uproto == IPPROTO_TCP && optname == IPV6_PKTINFO && 2934 sticky && !IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) { 2935 return (EINVAL); 2936 } 2937 2938 /* validate the interface index if specified. */ 2939 if (pktinfo->ipi6_ifindex > V_if_index || 2940 pktinfo->ipi6_ifindex < 0) { 2941 return (ENXIO); 2942 } 2943 if (pktinfo->ipi6_ifindex) { 2944 ifp = ifnet_byindex(pktinfo->ipi6_ifindex); 2945 if (ifp == NULL) 2946 return (ENXIO); 2947 } 2948 2949 /* 2950 * We store the address anyway, and let in6_selectsrc() 2951 * validate the specified address. This is because ipi6_addr 2952 * may not have enough information about its scope zone, and 2953 * we may need additional information (such as outgoing 2954 * interface or the scope zone of a destination address) to 2955 * disambiguate the scope. 2956 * XXX: the delay of the validation may confuse the 2957 * application when it is used as a sticky option. 2958 */ 2959 if (opt->ip6po_pktinfo == NULL) { 2960 opt->ip6po_pktinfo = malloc(sizeof(*pktinfo), 2961 M_IP6OPT, M_NOWAIT); 2962 if (opt->ip6po_pktinfo == NULL) 2963 return (ENOBUFS); 2964 } 2965 bcopy(pktinfo, opt->ip6po_pktinfo, sizeof(*pktinfo)); 2966 break; 2967 } 2968 2969 case IPV6_2292HOPLIMIT: 2970 case IPV6_HOPLIMIT: 2971 { 2972 int *hlimp; 2973 2974 /* 2975 * RFC 3542 deprecated the usage of sticky IPV6_HOPLIMIT 2976 * to simplify the ordering among hoplimit options. 2977 */ 2978 if (optname == IPV6_HOPLIMIT && sticky) 2979 return (ENOPROTOOPT); 2980 2981 if (len != sizeof(int)) 2982 return (EINVAL); 2983 hlimp = (int *)buf; 2984 if (*hlimp < -1 || *hlimp > 255) 2985 return (EINVAL); 2986 2987 opt->ip6po_hlim = *hlimp; 2988 break; 2989 } 2990 2991 case IPV6_TCLASS: 2992 { 2993 int tclass; 2994 2995 if (len != sizeof(int)) 2996 return (EINVAL); 2997 tclass = *(int *)buf; 2998 if (tclass < -1 || tclass > 255) 2999 return (EINVAL); 3000 3001 opt->ip6po_tclass = tclass; 3002 break; 3003 } 3004 3005 case IPV6_2292NEXTHOP: 3006 case IPV6_NEXTHOP: 3007 if (cred != NULL) { 3008 error = priv_check_cred(cred, 3009 PRIV_NETINET_SETHDROPTS, 0); 3010 if (error) 3011 return (error); 3012 } 3013 3014 if (len == 0) { /* just remove the option */ 3015 ip6_clearpktopts(opt, IPV6_NEXTHOP); 3016 break; 3017 } 3018 3019 /* check if cmsg_len is large enough for sa_len */ 3020 if (len < sizeof(struct sockaddr) || len < *buf) 3021 return (EINVAL); 3022 3023 switch (((struct sockaddr *)buf)->sa_family) { 3024 case AF_INET6: 3025 { 3026 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)buf; 3027 int error; 3028 3029 if (sa6->sin6_len != sizeof(struct sockaddr_in6)) 3030 return (EINVAL); 3031 3032 if (IN6_IS_ADDR_UNSPECIFIED(&sa6->sin6_addr) || 3033 IN6_IS_ADDR_MULTICAST(&sa6->sin6_addr)) { 3034 return (EINVAL); 3035 } 3036 if ((error = sa6_embedscope(sa6, V_ip6_use_defzone)) 3037 != 0) { 3038 return (error); 3039 } 3040 break; 3041 } 3042 case AF_LINK: /* should eventually be supported */ 3043 default: 3044 return (EAFNOSUPPORT); 3045 } 3046 3047 /* turn off the previous option, then set the new option. */ 3048 ip6_clearpktopts(opt, IPV6_NEXTHOP); 3049 opt->ip6po_nexthop = malloc(*buf, M_IP6OPT, M_NOWAIT); 3050 if (opt->ip6po_nexthop == NULL) 3051 return (ENOBUFS); 3052 bcopy(buf, opt->ip6po_nexthop, *buf); 3053 break; 3054 3055 case IPV6_2292HOPOPTS: 3056 case IPV6_HOPOPTS: 3057 { 3058 struct ip6_hbh *hbh; 3059 int hbhlen; 3060 3061 /* 3062 * XXX: We don't allow a non-privileged user to set ANY HbH 3063 * options, since per-option restriction has too much 3064 * overhead. 3065 */ 3066 if (cred != NULL) { 3067 error = priv_check_cred(cred, 3068 PRIV_NETINET_SETHDROPTS, 0); 3069 if (error) 3070 return (error); 3071 } 3072 3073 if (len == 0) { 3074 ip6_clearpktopts(opt, IPV6_HOPOPTS); 3075 break; /* just remove the option */ 3076 } 3077 3078 /* message length validation */ 3079 if (len < sizeof(struct ip6_hbh)) 3080 return (EINVAL); 3081 hbh = (struct ip6_hbh *)buf; 3082 hbhlen = (hbh->ip6h_len + 1) << 3; 3083 if (len != hbhlen) 3084 return (EINVAL); 3085 3086 /* turn off the previous option, then set the new option. */ 3087 ip6_clearpktopts(opt, IPV6_HOPOPTS); 3088 opt->ip6po_hbh = malloc(hbhlen, M_IP6OPT, M_NOWAIT); 3089 if (opt->ip6po_hbh == NULL) 3090 return (ENOBUFS); 3091 bcopy(hbh, opt->ip6po_hbh, hbhlen); 3092 3093 break; 3094 } 3095 3096 case IPV6_2292DSTOPTS: 3097 case IPV6_DSTOPTS: 3098 case IPV6_RTHDRDSTOPTS: 3099 { 3100 struct ip6_dest *dest, **newdest = NULL; 3101 int destlen; 3102 3103 if (cred != NULL) { /* XXX: see the comment for IPV6_HOPOPTS */ 3104 error = priv_check_cred(cred, 3105 PRIV_NETINET_SETHDROPTS, 0); 3106 if (error) 3107 return (error); 3108 } 3109 3110 if (len == 0) { 3111 ip6_clearpktopts(opt, optname); 3112 break; /* just remove the option */ 3113 } 3114 3115 /* message length validation */ 3116 if (len < sizeof(struct ip6_dest)) 3117 return (EINVAL); 3118 dest = (struct ip6_dest *)buf; 3119 destlen = (dest->ip6d_len + 1) << 3; 3120 if (len != destlen) 3121 return (EINVAL); 3122 3123 /* 3124 * Determine the position that the destination options header 3125 * should be inserted; before or after the routing header. 3126 */ 3127 switch (optname) { 3128 case IPV6_2292DSTOPTS: 3129 /* 3130 * The old advacned API is ambiguous on this point. 3131 * Our approach is to determine the position based 3132 * according to the existence of a routing header. 3133 * Note, however, that this depends on the order of the 3134 * extension headers in the ancillary data; the 1st 3135 * part of the destination options header must appear 3136 * before the routing header in the ancillary data, 3137 * too. 3138 * RFC3542 solved the ambiguity by introducing 3139 * separate ancillary data or option types. 3140 */ 3141 if (opt->ip6po_rthdr == NULL) 3142 newdest = &opt->ip6po_dest1; 3143 else 3144 newdest = &opt->ip6po_dest2; 3145 break; 3146 case IPV6_RTHDRDSTOPTS: 3147 newdest = &opt->ip6po_dest1; 3148 break; 3149 case IPV6_DSTOPTS: 3150 newdest = &opt->ip6po_dest2; 3151 break; 3152 } 3153 3154 /* turn off the previous option, then set the new option. */ 3155 ip6_clearpktopts(opt, optname); 3156 *newdest = malloc(destlen, M_IP6OPT, M_NOWAIT); 3157 if (*newdest == NULL) 3158 return (ENOBUFS); 3159 bcopy(dest, *newdest, destlen); 3160 3161 break; 3162 } 3163 3164 case IPV6_2292RTHDR: 3165 case IPV6_RTHDR: 3166 { 3167 struct ip6_rthdr *rth; 3168 int rthlen; 3169 3170 if (len == 0) { 3171 ip6_clearpktopts(opt, IPV6_RTHDR); 3172 break; /* just remove the option */ 3173 } 3174 3175 /* message length validation */ 3176 if (len < sizeof(struct ip6_rthdr)) 3177 return (EINVAL); 3178 rth = (struct ip6_rthdr *)buf; 3179 rthlen = (rth->ip6r_len + 1) << 3; 3180 if (len != rthlen) 3181 return (EINVAL); 3182 3183 switch (rth->ip6r_type) { 3184 case IPV6_RTHDR_TYPE_0: 3185 if (rth->ip6r_len == 0) /* must contain one addr */ 3186 return (EINVAL); 3187 if (rth->ip6r_len % 2) /* length must be even */ 3188 return (EINVAL); 3189 if (rth->ip6r_len / 2 != rth->ip6r_segleft) 3190 return (EINVAL); 3191 break; 3192 default: 3193 return (EINVAL); /* not supported */ 3194 } 3195 3196 /* turn off the previous option */ 3197 ip6_clearpktopts(opt, IPV6_RTHDR); 3198 opt->ip6po_rthdr = malloc(rthlen, M_IP6OPT, M_NOWAIT); 3199 if (opt->ip6po_rthdr == NULL) 3200 return (ENOBUFS); 3201 bcopy(rth, opt->ip6po_rthdr, rthlen); 3202 3203 break; 3204 } 3205 3206 case IPV6_USE_MIN_MTU: 3207 if (len != sizeof(int)) 3208 return (EINVAL); 3209 minmtupolicy = *(int *)buf; 3210 if (minmtupolicy != IP6PO_MINMTU_MCASTONLY && 3211 minmtupolicy != IP6PO_MINMTU_DISABLE && 3212 minmtupolicy != IP6PO_MINMTU_ALL) { 3213 return (EINVAL); 3214 } 3215 opt->ip6po_minmtu = minmtupolicy; 3216 break; 3217 3218 case IPV6_DONTFRAG: 3219 if (len != sizeof(int)) 3220 return (EINVAL); 3221 3222 if (uproto == IPPROTO_TCP || *(int *)buf == 0) { 3223 /* 3224 * we ignore this option for TCP sockets. 3225 * (RFC3542 leaves this case unspecified.) 3226 */ 3227 opt->ip6po_flags &= ~IP6PO_DONTFRAG; 3228 } else 3229 opt->ip6po_flags |= IP6PO_DONTFRAG; 3230 break; 3231 3232 case IPV6_PREFER_TEMPADDR: 3233 if (len != sizeof(int)) 3234 return (EINVAL); 3235 preftemp = *(int *)buf; 3236 if (preftemp != IP6PO_TEMPADDR_SYSTEM && 3237 preftemp != IP6PO_TEMPADDR_NOTPREFER && 3238 preftemp != IP6PO_TEMPADDR_PREFER) { 3239 return (EINVAL); 3240 } 3241 opt->ip6po_prefer_tempaddr = preftemp; 3242 break; 3243 3244 default: 3245 return (ENOPROTOOPT); 3246 } /* end of switch */ 3247 3248 return (0); 3249 } 3250 3251 /* 3252 * Routine called from ip6_output() to loop back a copy of an IP6 multicast 3253 * packet to the input queue of a specified interface. Note that this 3254 * calls the output routine of the loopback "driver", but with an interface 3255 * pointer that might NOT be &loif -- easier than replicating that code here. 3256 */ 3257 void 3258 ip6_mloopback(struct ifnet *ifp, struct mbuf *m, struct sockaddr_in6 *dst) 3259 { 3260 struct mbuf *copym; 3261 struct ip6_hdr *ip6; 3262 3263 copym = m_copy(m, 0, M_COPYALL); 3264 if (copym == NULL) 3265 return; 3266 3267 /* 3268 * Make sure to deep-copy IPv6 header portion in case the data 3269 * is in an mbuf cluster, so that we can safely override the IPv6 3270 * header portion later. 3271 */ 3272 if ((copym->m_flags & M_EXT) != 0 || 3273 copym->m_len < sizeof(struct ip6_hdr)) { 3274 copym = m_pullup(copym, sizeof(struct ip6_hdr)); 3275 if (copym == NULL) 3276 return; 3277 } 3278 3279 #ifdef DIAGNOSTIC 3280 if (copym->m_len < sizeof(*ip6)) { 3281 m_freem(copym); 3282 return; 3283 } 3284 #endif 3285 3286 ip6 = mtod(copym, struct ip6_hdr *); 3287 /* 3288 * clear embedded scope identifiers if necessary. 3289 * in6_clearscope will touch the addresses only when necessary. 3290 */ 3291 in6_clearscope(&ip6->ip6_src); 3292 in6_clearscope(&ip6->ip6_dst); 3293 3294 (void)if_simloop(ifp, copym, dst->sin6_family, 0); 3295 } 3296 3297 /* 3298 * Chop IPv6 header off from the payload. 3299 */ 3300 static int 3301 ip6_splithdr(struct mbuf *m, struct ip6_exthdrs *exthdrs) 3302 { 3303 struct mbuf *mh; 3304 struct ip6_hdr *ip6; 3305 3306 ip6 = mtod(m, struct ip6_hdr *); 3307 if (m->m_len > sizeof(*ip6)) { 3308 MGETHDR(mh, M_DONTWAIT, MT_HEADER); 3309 if (mh == 0) { 3310 m_freem(m); 3311 return ENOBUFS; 3312 } 3313 M_MOVE_PKTHDR(mh, m); 3314 MH_ALIGN(mh, sizeof(*ip6)); 3315 m->m_len -= sizeof(*ip6); 3316 m->m_data += sizeof(*ip6); 3317 mh->m_next = m; 3318 m = mh; 3319 m->m_len = sizeof(*ip6); 3320 bcopy((caddr_t)ip6, mtod(m, caddr_t), sizeof(*ip6)); 3321 } 3322 exthdrs->ip6e_ip6 = m; 3323 return 0; 3324 } 3325 3326 /* 3327 * Compute IPv6 extension header length. 3328 */ 3329 int 3330 ip6_optlen(struct inpcb *in6p) 3331 { 3332 int len; 3333 3334 if (!in6p->in6p_outputopts) 3335 return 0; 3336 3337 len = 0; 3338 #define elen(x) \ 3339 (((struct ip6_ext *)(x)) ? (((struct ip6_ext *)(x))->ip6e_len + 1) << 3 : 0) 3340 3341 len += elen(in6p->in6p_outputopts->ip6po_hbh); 3342 if (in6p->in6p_outputopts->ip6po_rthdr) 3343 /* dest1 is valid with rthdr only */ 3344 len += elen(in6p->in6p_outputopts->ip6po_dest1); 3345 len += elen(in6p->in6p_outputopts->ip6po_rthdr); 3346 len += elen(in6p->in6p_outputopts->ip6po_dest2); 3347 return len; 3348 #undef elen 3349 } 3350