1 /* 2 * IPv6 BSD socket options interface 3 * Linux INET6 implementation 4 * 5 * Authors: 6 * Pedro Roque <roque@di.fc.ul.pt> 7 * 8 * Based on linux/net/ipv4/ip_sockglue.c 9 * 10 * $Id: ipv6_sockglue.c,v 1.41 2002/02/01 22:01:04 davem Exp $ 11 * 12 * This program is free software; you can redistribute it and/or 13 * modify it under the terms of the GNU General Public License 14 * as published by the Free Software Foundation; either version 15 * 2 of the License, or (at your option) any later version. 16 * 17 * FIXME: Make the setsockopt code POSIX compliant: That is 18 * 19 * o Truncate getsockopt returns 20 * o Return an optlen of the truncated length if need be 21 * 22 * Changes: 23 * David L Stevens <dlstevens@us.ibm.com>: 24 * - added multicast source filtering API for MLDv2 25 */ 26 27 #include <linux/module.h> 28 #include <linux/capability.h> 29 #include <linux/errno.h> 30 #include <linux/types.h> 31 #include <linux/socket.h> 32 #include <linux/sockios.h> 33 #include <linux/net.h> 34 #include <linux/in6.h> 35 #include <linux/mroute6.h> 36 #include <linux/netdevice.h> 37 #include <linux/if_arp.h> 38 #include <linux/init.h> 39 #include <linux/sysctl.h> 40 #include <linux/netfilter.h> 41 42 #include <net/sock.h> 43 #include <net/snmp.h> 44 #include <net/ipv6.h> 45 #include <net/ndisc.h> 46 #include <net/protocol.h> 47 #include <net/transp_v6.h> 48 #include <net/ip6_route.h> 49 #include <net/addrconf.h> 50 #include <net/inet_common.h> 51 #include <net/tcp.h> 52 #include <net/udp.h> 53 #include <net/udplite.h> 54 #include <net/xfrm.h> 55 #include <net/compat.h> 56 57 #include <asm/uaccess.h> 58 59 DEFINE_SNMP_STAT(struct ipstats_mib, ipv6_statistics) __read_mostly; 60 61 struct ip6_ra_chain *ip6_ra_chain; 62 DEFINE_RWLOCK(ip6_ra_lock); 63 64 int ip6_ra_control(struct sock *sk, int sel, void (*destructor)(struct sock *)) 65 { 66 struct ip6_ra_chain *ra, *new_ra, **rap; 67 68 /* RA packet may be delivered ONLY to IPPROTO_RAW socket */ 69 if (sk->sk_type != SOCK_RAW || inet_sk(sk)->num != IPPROTO_RAW) 70 return -EINVAL; 71 72 new_ra = (sel>=0) ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL; 73 74 write_lock_bh(&ip6_ra_lock); 75 for (rap = &ip6_ra_chain; (ra=*rap) != NULL; rap = &ra->next) { 76 if (ra->sk == sk) { 77 if (sel>=0) { 78 write_unlock_bh(&ip6_ra_lock); 79 kfree(new_ra); 80 return -EADDRINUSE; 81 } 82 83 *rap = ra->next; 84 write_unlock_bh(&ip6_ra_lock); 85 86 if (ra->destructor) 87 ra->destructor(sk); 88 sock_put(sk); 89 kfree(ra); 90 return 0; 91 } 92 } 93 if (new_ra == NULL) { 94 write_unlock_bh(&ip6_ra_lock); 95 return -ENOBUFS; 96 } 97 new_ra->sk = sk; 98 new_ra->sel = sel; 99 new_ra->destructor = destructor; 100 new_ra->next = ra; 101 *rap = new_ra; 102 sock_hold(sk); 103 write_unlock_bh(&ip6_ra_lock); 104 return 0; 105 } 106 107 static 108 struct ipv6_txoptions *ipv6_update_options(struct sock *sk, 109 struct ipv6_txoptions *opt) 110 { 111 if (inet_sk(sk)->is_icsk) { 112 if (opt && 113 !((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) && 114 inet_sk(sk)->daddr != LOOPBACK4_IPV6) { 115 struct inet_connection_sock *icsk = inet_csk(sk); 116 icsk->icsk_ext_hdr_len = opt->opt_flen + opt->opt_nflen; 117 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie); 118 } 119 opt = xchg(&inet6_sk(sk)->opt, opt); 120 } else { 121 write_lock(&sk->sk_dst_lock); 122 opt = xchg(&inet6_sk(sk)->opt, opt); 123 write_unlock(&sk->sk_dst_lock); 124 } 125 sk_dst_reset(sk); 126 127 return opt; 128 } 129 130 static int do_ipv6_setsockopt(struct sock *sk, int level, int optname, 131 char __user *optval, int optlen) 132 { 133 struct ipv6_pinfo *np = inet6_sk(sk); 134 struct net *net = sock_net(sk); 135 int val, valbool; 136 int retv = -ENOPROTOOPT; 137 138 if (optval == NULL) 139 val=0; 140 else { 141 if (optlen >= sizeof(int)) { 142 if (get_user(val, (int __user *) optval)) 143 return -EFAULT; 144 } else 145 val = 0; 146 } 147 148 valbool = (val!=0); 149 150 if (ip6_mroute_opt(optname)) 151 return ip6_mroute_setsockopt(sk, optname, optval, optlen); 152 153 lock_sock(sk); 154 155 switch (optname) { 156 157 case IPV6_ADDRFORM: 158 if (optlen < sizeof(int)) 159 goto e_inval; 160 if (val == PF_INET) { 161 struct ipv6_txoptions *opt; 162 struct sk_buff *pktopt; 163 164 if (sk->sk_type == SOCK_RAW) 165 break; 166 167 if (sk->sk_protocol == IPPROTO_UDP || 168 sk->sk_protocol == IPPROTO_UDPLITE) { 169 struct udp_sock *up = udp_sk(sk); 170 if (up->pending == AF_INET6) { 171 retv = -EBUSY; 172 break; 173 } 174 } else if (sk->sk_protocol != IPPROTO_TCP) 175 break; 176 177 if (sk->sk_state != TCP_ESTABLISHED) { 178 retv = -ENOTCONN; 179 break; 180 } 181 182 if (ipv6_only_sock(sk) || 183 !ipv6_addr_v4mapped(&np->daddr)) { 184 retv = -EADDRNOTAVAIL; 185 break; 186 } 187 188 fl6_free_socklist(sk); 189 ipv6_sock_mc_close(sk); 190 191 /* 192 * Sock is moving from IPv6 to IPv4 (sk_prot), so 193 * remove it from the refcnt debug socks count in the 194 * original family... 195 */ 196 sk_refcnt_debug_dec(sk); 197 198 if (sk->sk_protocol == IPPROTO_TCP) { 199 struct inet_connection_sock *icsk = inet_csk(sk); 200 local_bh_disable(); 201 sock_prot_inuse_add(net, sk->sk_prot, -1); 202 sock_prot_inuse_add(net, &tcp_prot, 1); 203 local_bh_enable(); 204 sk->sk_prot = &tcp_prot; 205 icsk->icsk_af_ops = &ipv4_specific; 206 sk->sk_socket->ops = &inet_stream_ops; 207 sk->sk_family = PF_INET; 208 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie); 209 } else { 210 struct proto *prot = &udp_prot; 211 212 if (sk->sk_protocol == IPPROTO_UDPLITE) 213 prot = &udplite_prot; 214 local_bh_disable(); 215 sock_prot_inuse_add(net, sk->sk_prot, -1); 216 sock_prot_inuse_add(net, prot, 1); 217 local_bh_enable(); 218 sk->sk_prot = prot; 219 sk->sk_socket->ops = &inet_dgram_ops; 220 sk->sk_family = PF_INET; 221 } 222 opt = xchg(&np->opt, NULL); 223 if (opt) 224 sock_kfree_s(sk, opt, opt->tot_len); 225 pktopt = xchg(&np->pktoptions, NULL); 226 if (pktopt) 227 kfree_skb(pktopt); 228 229 sk->sk_destruct = inet_sock_destruct; 230 /* 231 * ... and add it to the refcnt debug socks count 232 * in the new family. -acme 233 */ 234 sk_refcnt_debug_inc(sk); 235 module_put(THIS_MODULE); 236 retv = 0; 237 break; 238 } 239 goto e_inval; 240 241 case IPV6_V6ONLY: 242 if (optlen < sizeof(int) || 243 inet_sk(sk)->num) 244 goto e_inval; 245 np->ipv6only = valbool; 246 retv = 0; 247 break; 248 249 case IPV6_RECVPKTINFO: 250 if (optlen < sizeof(int)) 251 goto e_inval; 252 np->rxopt.bits.rxinfo = valbool; 253 retv = 0; 254 break; 255 256 case IPV6_2292PKTINFO: 257 if (optlen < sizeof(int)) 258 goto e_inval; 259 np->rxopt.bits.rxoinfo = valbool; 260 retv = 0; 261 break; 262 263 case IPV6_RECVHOPLIMIT: 264 if (optlen < sizeof(int)) 265 goto e_inval; 266 np->rxopt.bits.rxhlim = valbool; 267 retv = 0; 268 break; 269 270 case IPV6_2292HOPLIMIT: 271 if (optlen < sizeof(int)) 272 goto e_inval; 273 np->rxopt.bits.rxohlim = valbool; 274 retv = 0; 275 break; 276 277 case IPV6_RECVRTHDR: 278 if (optlen < sizeof(int)) 279 goto e_inval; 280 np->rxopt.bits.srcrt = valbool; 281 retv = 0; 282 break; 283 284 case IPV6_2292RTHDR: 285 if (optlen < sizeof(int)) 286 goto e_inval; 287 np->rxopt.bits.osrcrt = valbool; 288 retv = 0; 289 break; 290 291 case IPV6_RECVHOPOPTS: 292 if (optlen < sizeof(int)) 293 goto e_inval; 294 np->rxopt.bits.hopopts = valbool; 295 retv = 0; 296 break; 297 298 case IPV6_2292HOPOPTS: 299 if (optlen < sizeof(int)) 300 goto e_inval; 301 np->rxopt.bits.ohopopts = valbool; 302 retv = 0; 303 break; 304 305 case IPV6_RECVDSTOPTS: 306 if (optlen < sizeof(int)) 307 goto e_inval; 308 np->rxopt.bits.dstopts = valbool; 309 retv = 0; 310 break; 311 312 case IPV6_2292DSTOPTS: 313 if (optlen < sizeof(int)) 314 goto e_inval; 315 np->rxopt.bits.odstopts = valbool; 316 retv = 0; 317 break; 318 319 case IPV6_TCLASS: 320 if (optlen < sizeof(int)) 321 goto e_inval; 322 if (val < -1 || val > 0xff) 323 goto e_inval; 324 np->tclass = val; 325 retv = 0; 326 break; 327 328 case IPV6_RECVTCLASS: 329 if (optlen < sizeof(int)) 330 goto e_inval; 331 np->rxopt.bits.rxtclass = valbool; 332 retv = 0; 333 break; 334 335 case IPV6_FLOWINFO: 336 if (optlen < sizeof(int)) 337 goto e_inval; 338 np->rxopt.bits.rxflow = valbool; 339 retv = 0; 340 break; 341 342 case IPV6_HOPOPTS: 343 case IPV6_RTHDRDSTOPTS: 344 case IPV6_RTHDR: 345 case IPV6_DSTOPTS: 346 { 347 struct ipv6_txoptions *opt; 348 if (optlen == 0) 349 optval = NULL; 350 351 /* hop-by-hop / destination options are privileged option */ 352 retv = -EPERM; 353 if (optname != IPV6_RTHDR && !capable(CAP_NET_RAW)) 354 break; 355 356 if (optlen < sizeof(struct ipv6_opt_hdr) || 357 optlen & 0x7 || optlen > 8 * 255) 358 goto e_inval; 359 360 opt = ipv6_renew_options(sk, np->opt, optname, 361 (struct ipv6_opt_hdr __user *)optval, 362 optlen); 363 if (IS_ERR(opt)) { 364 retv = PTR_ERR(opt); 365 break; 366 } 367 368 /* routing header option needs extra check */ 369 if (optname == IPV6_RTHDR && opt && opt->srcrt) { 370 struct ipv6_rt_hdr *rthdr = opt->srcrt; 371 switch (rthdr->type) { 372 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 373 case IPV6_SRCRT_TYPE_2: 374 break; 375 #endif 376 default: 377 goto sticky_done; 378 } 379 380 if ((rthdr->hdrlen & 1) || 381 (rthdr->hdrlen >> 1) != rthdr->segments_left) 382 goto sticky_done; 383 } 384 385 retv = 0; 386 opt = ipv6_update_options(sk, opt); 387 sticky_done: 388 if (opt) 389 sock_kfree_s(sk, opt, opt->tot_len); 390 break; 391 } 392 393 case IPV6_2292PKTOPTIONS: 394 { 395 struct ipv6_txoptions *opt = NULL; 396 struct msghdr msg; 397 struct flowi fl; 398 int junk; 399 400 fl.fl6_flowlabel = 0; 401 fl.oif = sk->sk_bound_dev_if; 402 403 if (optlen == 0) 404 goto update; 405 406 /* 1K is probably excessive 407 * 1K is surely not enough, 2K per standard header is 16K. 408 */ 409 retv = -EINVAL; 410 if (optlen > 64*1024) 411 break; 412 413 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL); 414 retv = -ENOBUFS; 415 if (opt == NULL) 416 break; 417 418 memset(opt, 0, sizeof(*opt)); 419 opt->tot_len = sizeof(*opt) + optlen; 420 retv = -EFAULT; 421 if (copy_from_user(opt+1, optval, optlen)) 422 goto done; 423 424 msg.msg_controllen = optlen; 425 msg.msg_control = (void*)(opt+1); 426 427 retv = datagram_send_ctl(net, &msg, &fl, opt, &junk, &junk); 428 if (retv) 429 goto done; 430 update: 431 retv = 0; 432 opt = ipv6_update_options(sk, opt); 433 done: 434 if (opt) 435 sock_kfree_s(sk, opt, opt->tot_len); 436 break; 437 } 438 case IPV6_UNICAST_HOPS: 439 if (optlen < sizeof(int)) 440 goto e_inval; 441 if (val > 255 || val < -1) 442 goto e_inval; 443 np->hop_limit = val; 444 retv = 0; 445 break; 446 447 case IPV6_MULTICAST_HOPS: 448 if (sk->sk_type == SOCK_STREAM) 449 goto e_inval; 450 if (optlen < sizeof(int)) 451 goto e_inval; 452 if (val > 255 || val < -1) 453 goto e_inval; 454 np->mcast_hops = val; 455 retv = 0; 456 break; 457 458 case IPV6_MULTICAST_LOOP: 459 if (optlen < sizeof(int)) 460 goto e_inval; 461 np->mc_loop = valbool; 462 retv = 0; 463 break; 464 465 case IPV6_MULTICAST_IF: 466 if (sk->sk_type == SOCK_STREAM) 467 goto e_inval; 468 if (optlen < sizeof(int)) 469 goto e_inval; 470 471 if (val) { 472 if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != val) 473 goto e_inval; 474 475 if (__dev_get_by_index(net, val) == NULL) { 476 retv = -ENODEV; 477 break; 478 } 479 } 480 np->mcast_oif = val; 481 retv = 0; 482 break; 483 case IPV6_ADD_MEMBERSHIP: 484 case IPV6_DROP_MEMBERSHIP: 485 { 486 struct ipv6_mreq mreq; 487 488 if (optlen < sizeof(struct ipv6_mreq)) 489 goto e_inval; 490 491 retv = -EPROTO; 492 if (inet_sk(sk)->is_icsk) 493 break; 494 495 retv = -EFAULT; 496 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq))) 497 break; 498 499 if (optname == IPV6_ADD_MEMBERSHIP) 500 retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr); 501 else 502 retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr); 503 break; 504 } 505 case IPV6_JOIN_ANYCAST: 506 case IPV6_LEAVE_ANYCAST: 507 { 508 struct ipv6_mreq mreq; 509 510 if (optlen < sizeof(struct ipv6_mreq)) 511 goto e_inval; 512 513 retv = -EFAULT; 514 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq))) 515 break; 516 517 if (optname == IPV6_JOIN_ANYCAST) 518 retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr); 519 else 520 retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr); 521 break; 522 } 523 case MCAST_JOIN_GROUP: 524 case MCAST_LEAVE_GROUP: 525 { 526 struct group_req greq; 527 struct sockaddr_in6 *psin6; 528 529 if (optlen < sizeof(struct group_req)) 530 goto e_inval; 531 532 retv = -EFAULT; 533 if (copy_from_user(&greq, optval, sizeof(struct group_req))) 534 break; 535 if (greq.gr_group.ss_family != AF_INET6) { 536 retv = -EADDRNOTAVAIL; 537 break; 538 } 539 psin6 = (struct sockaddr_in6 *)&greq.gr_group; 540 if (optname == MCAST_JOIN_GROUP) 541 retv = ipv6_sock_mc_join(sk, greq.gr_interface, 542 &psin6->sin6_addr); 543 else 544 retv = ipv6_sock_mc_drop(sk, greq.gr_interface, 545 &psin6->sin6_addr); 546 break; 547 } 548 case MCAST_JOIN_SOURCE_GROUP: 549 case MCAST_LEAVE_SOURCE_GROUP: 550 case MCAST_BLOCK_SOURCE: 551 case MCAST_UNBLOCK_SOURCE: 552 { 553 struct group_source_req greqs; 554 int omode, add; 555 556 if (optlen < sizeof(struct group_source_req)) 557 goto e_inval; 558 if (copy_from_user(&greqs, optval, sizeof(greqs))) { 559 retv = -EFAULT; 560 break; 561 } 562 if (greqs.gsr_group.ss_family != AF_INET6 || 563 greqs.gsr_source.ss_family != AF_INET6) { 564 retv = -EADDRNOTAVAIL; 565 break; 566 } 567 if (optname == MCAST_BLOCK_SOURCE) { 568 omode = MCAST_EXCLUDE; 569 add = 1; 570 } else if (optname == MCAST_UNBLOCK_SOURCE) { 571 omode = MCAST_EXCLUDE; 572 add = 0; 573 } else if (optname == MCAST_JOIN_SOURCE_GROUP) { 574 struct sockaddr_in6 *psin6; 575 576 psin6 = (struct sockaddr_in6 *)&greqs.gsr_group; 577 retv = ipv6_sock_mc_join(sk, greqs.gsr_interface, 578 &psin6->sin6_addr); 579 /* prior join w/ different source is ok */ 580 if (retv && retv != -EADDRINUSE) 581 break; 582 omode = MCAST_INCLUDE; 583 add = 1; 584 } else /* MCAST_LEAVE_SOURCE_GROUP */ { 585 omode = MCAST_INCLUDE; 586 add = 0; 587 } 588 retv = ip6_mc_source(add, omode, sk, &greqs); 589 break; 590 } 591 case MCAST_MSFILTER: 592 { 593 extern int sysctl_mld_max_msf; 594 struct group_filter *gsf; 595 596 if (optlen < GROUP_FILTER_SIZE(0)) 597 goto e_inval; 598 if (optlen > sysctl_optmem_max) { 599 retv = -ENOBUFS; 600 break; 601 } 602 gsf = kmalloc(optlen,GFP_KERNEL); 603 if (!gsf) { 604 retv = -ENOBUFS; 605 break; 606 } 607 retv = -EFAULT; 608 if (copy_from_user(gsf, optval, optlen)) { 609 kfree(gsf); 610 break; 611 } 612 /* numsrc >= (4G-140)/128 overflow in 32 bits */ 613 if (gsf->gf_numsrc >= 0x1ffffffU || 614 gsf->gf_numsrc > sysctl_mld_max_msf) { 615 kfree(gsf); 616 retv = -ENOBUFS; 617 break; 618 } 619 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) { 620 kfree(gsf); 621 retv = -EINVAL; 622 break; 623 } 624 retv = ip6_mc_msfilter(sk, gsf); 625 kfree(gsf); 626 627 break; 628 } 629 case IPV6_ROUTER_ALERT: 630 if (optlen < sizeof(int)) 631 goto e_inval; 632 retv = ip6_ra_control(sk, val, NULL); 633 break; 634 case IPV6_MTU_DISCOVER: 635 if (optlen < sizeof(int)) 636 goto e_inval; 637 if (val<0 || val>3) 638 goto e_inval; 639 np->pmtudisc = val; 640 retv = 0; 641 break; 642 case IPV6_MTU: 643 if (optlen < sizeof(int)) 644 goto e_inval; 645 if (val && val < IPV6_MIN_MTU) 646 goto e_inval; 647 np->frag_size = val; 648 retv = 0; 649 break; 650 case IPV6_RECVERR: 651 if (optlen < sizeof(int)) 652 goto e_inval; 653 np->recverr = valbool; 654 if (!val) 655 skb_queue_purge(&sk->sk_error_queue); 656 retv = 0; 657 break; 658 case IPV6_FLOWINFO_SEND: 659 if (optlen < sizeof(int)) 660 goto e_inval; 661 np->sndflow = valbool; 662 retv = 0; 663 break; 664 case IPV6_FLOWLABEL_MGR: 665 retv = ipv6_flowlabel_opt(sk, optval, optlen); 666 break; 667 case IPV6_IPSEC_POLICY: 668 case IPV6_XFRM_POLICY: 669 retv = -EPERM; 670 if (!capable(CAP_NET_ADMIN)) 671 break; 672 retv = xfrm_user_policy(sk, optname, optval, optlen); 673 break; 674 675 case IPV6_ADDR_PREFERENCES: 676 { 677 unsigned int pref = 0; 678 unsigned int prefmask = ~0; 679 680 if (optlen < sizeof(int)) 681 goto e_inval; 682 683 retv = -EINVAL; 684 685 /* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */ 686 switch (val & (IPV6_PREFER_SRC_PUBLIC| 687 IPV6_PREFER_SRC_TMP| 688 IPV6_PREFER_SRC_PUBTMP_DEFAULT)) { 689 case IPV6_PREFER_SRC_PUBLIC: 690 pref |= IPV6_PREFER_SRC_PUBLIC; 691 break; 692 case IPV6_PREFER_SRC_TMP: 693 pref |= IPV6_PREFER_SRC_TMP; 694 break; 695 case IPV6_PREFER_SRC_PUBTMP_DEFAULT: 696 break; 697 case 0: 698 goto pref_skip_pubtmp; 699 default: 700 goto e_inval; 701 } 702 703 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC| 704 IPV6_PREFER_SRC_TMP); 705 pref_skip_pubtmp: 706 707 /* check HOME/COA conflicts */ 708 switch (val & (IPV6_PREFER_SRC_HOME|IPV6_PREFER_SRC_COA)) { 709 case IPV6_PREFER_SRC_HOME: 710 break; 711 case IPV6_PREFER_SRC_COA: 712 pref |= IPV6_PREFER_SRC_COA; 713 case 0: 714 goto pref_skip_coa; 715 default: 716 goto e_inval; 717 } 718 719 prefmask &= ~IPV6_PREFER_SRC_COA; 720 pref_skip_coa: 721 722 /* check CGA/NONCGA conflicts */ 723 switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) { 724 case IPV6_PREFER_SRC_CGA: 725 case IPV6_PREFER_SRC_NONCGA: 726 case 0: 727 break; 728 default: 729 goto e_inval; 730 } 731 732 np->srcprefs = (np->srcprefs & prefmask) | pref; 733 retv = 0; 734 735 break; 736 } 737 } 738 739 release_sock(sk); 740 741 return retv; 742 743 e_inval: 744 release_sock(sk); 745 return -EINVAL; 746 } 747 748 int ipv6_setsockopt(struct sock *sk, int level, int optname, 749 char __user *optval, int optlen) 750 { 751 int err; 752 753 if (level == SOL_IP && sk->sk_type != SOCK_RAW) 754 return udp_prot.setsockopt(sk, level, optname, optval, optlen); 755 756 if (level != SOL_IPV6) 757 return -ENOPROTOOPT; 758 759 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen); 760 #ifdef CONFIG_NETFILTER 761 /* we need to exclude all possible ENOPROTOOPTs except default case */ 762 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY && 763 optname != IPV6_XFRM_POLICY) { 764 lock_sock(sk); 765 err = nf_setsockopt(sk, PF_INET6, optname, optval, 766 optlen); 767 release_sock(sk); 768 } 769 #endif 770 return err; 771 } 772 773 EXPORT_SYMBOL(ipv6_setsockopt); 774 775 #ifdef CONFIG_COMPAT 776 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname, 777 char __user *optval, int optlen) 778 { 779 int err; 780 781 if (level == SOL_IP && sk->sk_type != SOCK_RAW) { 782 if (udp_prot.compat_setsockopt != NULL) 783 return udp_prot.compat_setsockopt(sk, level, optname, 784 optval, optlen); 785 return udp_prot.setsockopt(sk, level, optname, optval, optlen); 786 } 787 788 if (level != SOL_IPV6) 789 return -ENOPROTOOPT; 790 791 if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER) 792 return compat_mc_setsockopt(sk, level, optname, optval, optlen, 793 ipv6_setsockopt); 794 795 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen); 796 #ifdef CONFIG_NETFILTER 797 /* we need to exclude all possible ENOPROTOOPTs except default case */ 798 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY && 799 optname != IPV6_XFRM_POLICY) { 800 lock_sock(sk); 801 err = compat_nf_setsockopt(sk, PF_INET6, optname, 802 optval, optlen); 803 release_sock(sk); 804 } 805 #endif 806 return err; 807 } 808 809 EXPORT_SYMBOL(compat_ipv6_setsockopt); 810 #endif 811 812 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt, 813 int optname, char __user *optval, int len) 814 { 815 struct ipv6_opt_hdr *hdr; 816 817 if (!opt) 818 return 0; 819 820 switch(optname) { 821 case IPV6_HOPOPTS: 822 hdr = opt->hopopt; 823 break; 824 case IPV6_RTHDRDSTOPTS: 825 hdr = opt->dst0opt; 826 break; 827 case IPV6_RTHDR: 828 hdr = (struct ipv6_opt_hdr *)opt->srcrt; 829 break; 830 case IPV6_DSTOPTS: 831 hdr = opt->dst1opt; 832 break; 833 default: 834 return -EINVAL; /* should not happen */ 835 } 836 837 if (!hdr) 838 return 0; 839 840 len = min_t(unsigned int, len, ipv6_optlen(hdr)); 841 if (copy_to_user(optval, hdr, len)) 842 return -EFAULT; 843 return len; 844 } 845 846 static int do_ipv6_getsockopt(struct sock *sk, int level, int optname, 847 char __user *optval, int __user *optlen) 848 { 849 struct ipv6_pinfo *np = inet6_sk(sk); 850 int len; 851 int val; 852 853 if (ip6_mroute_opt(optname)) 854 return ip6_mroute_getsockopt(sk, optname, optval, optlen); 855 856 if (get_user(len, optlen)) 857 return -EFAULT; 858 switch (optname) { 859 case IPV6_ADDRFORM: 860 if (sk->sk_protocol != IPPROTO_UDP && 861 sk->sk_protocol != IPPROTO_UDPLITE && 862 sk->sk_protocol != IPPROTO_TCP) 863 return -EINVAL; 864 if (sk->sk_state != TCP_ESTABLISHED) 865 return -ENOTCONN; 866 val = sk->sk_family; 867 break; 868 case MCAST_MSFILTER: 869 { 870 struct group_filter gsf; 871 int err; 872 873 if (len < GROUP_FILTER_SIZE(0)) 874 return -EINVAL; 875 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) 876 return -EFAULT; 877 lock_sock(sk); 878 err = ip6_mc_msfget(sk, &gsf, 879 (struct group_filter __user *)optval, optlen); 880 release_sock(sk); 881 return err; 882 } 883 884 case IPV6_2292PKTOPTIONS: 885 { 886 struct msghdr msg; 887 struct sk_buff *skb; 888 889 if (sk->sk_type != SOCK_STREAM) 890 return -ENOPROTOOPT; 891 892 msg.msg_control = optval; 893 msg.msg_controllen = len; 894 msg.msg_flags = 0; 895 896 lock_sock(sk); 897 skb = np->pktoptions; 898 if (skb) 899 atomic_inc(&skb->users); 900 release_sock(sk); 901 902 if (skb) { 903 int err = datagram_recv_ctl(sk, &msg, skb); 904 kfree_skb(skb); 905 if (err) 906 return err; 907 } else { 908 if (np->rxopt.bits.rxinfo) { 909 struct in6_pktinfo src_info; 910 src_info.ipi6_ifindex = np->mcast_oif; 911 ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr); 912 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info); 913 } 914 if (np->rxopt.bits.rxhlim) { 915 int hlim = np->mcast_hops; 916 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim); 917 } 918 if (np->rxopt.bits.rxoinfo) { 919 struct in6_pktinfo src_info; 920 src_info.ipi6_ifindex = np->mcast_oif; 921 ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr); 922 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info); 923 } 924 if (np->rxopt.bits.rxohlim) { 925 int hlim = np->mcast_hops; 926 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim); 927 } 928 } 929 len -= msg.msg_controllen; 930 return put_user(len, optlen); 931 } 932 case IPV6_MTU: 933 { 934 struct dst_entry *dst; 935 val = 0; 936 lock_sock(sk); 937 dst = sk_dst_get(sk); 938 if (dst) { 939 val = dst_mtu(dst); 940 dst_release(dst); 941 } 942 release_sock(sk); 943 if (!val) 944 return -ENOTCONN; 945 break; 946 } 947 948 case IPV6_V6ONLY: 949 val = np->ipv6only; 950 break; 951 952 case IPV6_RECVPKTINFO: 953 val = np->rxopt.bits.rxinfo; 954 break; 955 956 case IPV6_2292PKTINFO: 957 val = np->rxopt.bits.rxoinfo; 958 break; 959 960 case IPV6_RECVHOPLIMIT: 961 val = np->rxopt.bits.rxhlim; 962 break; 963 964 case IPV6_2292HOPLIMIT: 965 val = np->rxopt.bits.rxohlim; 966 break; 967 968 case IPV6_RECVRTHDR: 969 val = np->rxopt.bits.srcrt; 970 break; 971 972 case IPV6_2292RTHDR: 973 val = np->rxopt.bits.osrcrt; 974 break; 975 976 case IPV6_HOPOPTS: 977 case IPV6_RTHDRDSTOPTS: 978 case IPV6_RTHDR: 979 case IPV6_DSTOPTS: 980 { 981 982 lock_sock(sk); 983 len = ipv6_getsockopt_sticky(sk, np->opt, 984 optname, optval, len); 985 release_sock(sk); 986 /* check if ipv6_getsockopt_sticky() returns err code */ 987 if (len < 0) 988 return len; 989 return put_user(len, optlen); 990 } 991 992 case IPV6_RECVHOPOPTS: 993 val = np->rxopt.bits.hopopts; 994 break; 995 996 case IPV6_2292HOPOPTS: 997 val = np->rxopt.bits.ohopopts; 998 break; 999 1000 case IPV6_RECVDSTOPTS: 1001 val = np->rxopt.bits.dstopts; 1002 break; 1003 1004 case IPV6_2292DSTOPTS: 1005 val = np->rxopt.bits.odstopts; 1006 break; 1007 1008 case IPV6_TCLASS: 1009 val = np->tclass; 1010 if (val < 0) 1011 val = 0; 1012 break; 1013 1014 case IPV6_RECVTCLASS: 1015 val = np->rxopt.bits.rxtclass; 1016 break; 1017 1018 case IPV6_FLOWINFO: 1019 val = np->rxopt.bits.rxflow; 1020 break; 1021 1022 case IPV6_UNICAST_HOPS: 1023 case IPV6_MULTICAST_HOPS: 1024 { 1025 struct dst_entry *dst; 1026 1027 if (optname == IPV6_UNICAST_HOPS) 1028 val = np->hop_limit; 1029 else 1030 val = np->mcast_hops; 1031 1032 dst = sk_dst_get(sk); 1033 if (dst) { 1034 if (val < 0) 1035 val = ip6_dst_hoplimit(dst); 1036 dst_release(dst); 1037 } 1038 if (val < 0) 1039 val = ipv6_devconf.hop_limit; 1040 break; 1041 } 1042 1043 case IPV6_MULTICAST_LOOP: 1044 val = np->mc_loop; 1045 break; 1046 1047 case IPV6_MULTICAST_IF: 1048 val = np->mcast_oif; 1049 break; 1050 1051 case IPV6_MTU_DISCOVER: 1052 val = np->pmtudisc; 1053 break; 1054 1055 case IPV6_RECVERR: 1056 val = np->recverr; 1057 break; 1058 1059 case IPV6_FLOWINFO_SEND: 1060 val = np->sndflow; 1061 break; 1062 1063 case IPV6_ADDR_PREFERENCES: 1064 val = 0; 1065 1066 if (np->srcprefs & IPV6_PREFER_SRC_TMP) 1067 val |= IPV6_PREFER_SRC_TMP; 1068 else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC) 1069 val |= IPV6_PREFER_SRC_PUBLIC; 1070 else { 1071 /* XXX: should we return system default? */ 1072 val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT; 1073 } 1074 1075 if (np->srcprefs & IPV6_PREFER_SRC_COA) 1076 val |= IPV6_PREFER_SRC_COA; 1077 else 1078 val |= IPV6_PREFER_SRC_HOME; 1079 break; 1080 1081 default: 1082 return -ENOPROTOOPT; 1083 } 1084 len = min_t(unsigned int, sizeof(int), len); 1085 if(put_user(len, optlen)) 1086 return -EFAULT; 1087 if(copy_to_user(optval,&val,len)) 1088 return -EFAULT; 1089 return 0; 1090 } 1091 1092 int ipv6_getsockopt(struct sock *sk, int level, int optname, 1093 char __user *optval, int __user *optlen) 1094 { 1095 int err; 1096 1097 if (level == SOL_IP && sk->sk_type != SOCK_RAW) 1098 return udp_prot.getsockopt(sk, level, optname, optval, optlen); 1099 1100 if(level != SOL_IPV6) 1101 return -ENOPROTOOPT; 1102 1103 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen); 1104 #ifdef CONFIG_NETFILTER 1105 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1106 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) { 1107 int len; 1108 1109 if (get_user(len, optlen)) 1110 return -EFAULT; 1111 1112 lock_sock(sk); 1113 err = nf_getsockopt(sk, PF_INET6, optname, optval, 1114 &len); 1115 release_sock(sk); 1116 if (err >= 0) 1117 err = put_user(len, optlen); 1118 } 1119 #endif 1120 return err; 1121 } 1122 1123 EXPORT_SYMBOL(ipv6_getsockopt); 1124 1125 #ifdef CONFIG_COMPAT 1126 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname, 1127 char __user *optval, int __user *optlen) 1128 { 1129 int err; 1130 1131 if (level == SOL_IP && sk->sk_type != SOCK_RAW) { 1132 if (udp_prot.compat_getsockopt != NULL) 1133 return udp_prot.compat_getsockopt(sk, level, optname, 1134 optval, optlen); 1135 return udp_prot.getsockopt(sk, level, optname, optval, optlen); 1136 } 1137 1138 if (level != SOL_IPV6) 1139 return -ENOPROTOOPT; 1140 1141 if (optname == MCAST_MSFILTER) 1142 return compat_mc_getsockopt(sk, level, optname, optval, optlen, 1143 ipv6_getsockopt); 1144 1145 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen); 1146 #ifdef CONFIG_NETFILTER 1147 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1148 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) { 1149 int len; 1150 1151 if (get_user(len, optlen)) 1152 return -EFAULT; 1153 1154 lock_sock(sk); 1155 err = compat_nf_getsockopt(sk, PF_INET6, 1156 optname, optval, &len); 1157 release_sock(sk); 1158 if (err >= 0) 1159 err = put_user(len, optlen); 1160 } 1161 #endif 1162 return err; 1163 } 1164 1165 EXPORT_SYMBOL(compat_ipv6_getsockopt); 1166 #endif 1167 1168