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 * This program is free software; you can redistribute it and/or 11 * modify it under the terms of the GNU General Public License 12 * as published by the Free Software Foundation; either version 13 * 2 of the License, or (at your option) any later version. 14 * 15 * FIXME: Make the setsockopt code POSIX compliant: That is 16 * 17 * o Truncate getsockopt returns 18 * o Return an optlen of the truncated length if need be 19 * 20 * Changes: 21 * David L Stevens <dlstevens@us.ibm.com>: 22 * - added multicast source filtering API for MLDv2 23 */ 24 25 #include <linux/module.h> 26 #include <linux/capability.h> 27 #include <linux/errno.h> 28 #include <linux/types.h> 29 #include <linux/socket.h> 30 #include <linux/sockios.h> 31 #include <linux/net.h> 32 #include <linux/in6.h> 33 #include <linux/mroute6.h> 34 #include <linux/netdevice.h> 35 #include <linux/if_arp.h> 36 #include <linux/init.h> 37 #include <linux/sysctl.h> 38 #include <linux/netfilter.h> 39 40 #include <net/sock.h> 41 #include <net/snmp.h> 42 #include <net/ipv6.h> 43 #include <net/ndisc.h> 44 #include <net/protocol.h> 45 #include <net/transp_v6.h> 46 #include <net/ip6_route.h> 47 #include <net/addrconf.h> 48 #include <net/inet_common.h> 49 #include <net/tcp.h> 50 #include <net/udp.h> 51 #include <net/udplite.h> 52 #include <net/xfrm.h> 53 #include <net/compat.h> 54 55 #include <asm/uaccess.h> 56 57 DEFINE_SNMP_STAT(struct ipstats_mib, ipv6_statistics) __read_mostly; 58 59 struct ip6_ra_chain *ip6_ra_chain; 60 DEFINE_RWLOCK(ip6_ra_lock); 61 62 int ip6_ra_control(struct sock *sk, int sel) 63 { 64 struct ip6_ra_chain *ra, *new_ra, **rap; 65 66 /* RA packet may be delivered ONLY to IPPROTO_RAW socket */ 67 if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num != IPPROTO_RAW) 68 return -ENOPROTOOPT; 69 70 new_ra = (sel>=0) ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL; 71 72 write_lock_bh(&ip6_ra_lock); 73 for (rap = &ip6_ra_chain; (ra=*rap) != NULL; rap = &ra->next) { 74 if (ra->sk == sk) { 75 if (sel>=0) { 76 write_unlock_bh(&ip6_ra_lock); 77 kfree(new_ra); 78 return -EADDRINUSE; 79 } 80 81 *rap = ra->next; 82 write_unlock_bh(&ip6_ra_lock); 83 84 sock_put(sk); 85 kfree(ra); 86 return 0; 87 } 88 } 89 if (new_ra == NULL) { 90 write_unlock_bh(&ip6_ra_lock); 91 return -ENOBUFS; 92 } 93 new_ra->sk = sk; 94 new_ra->sel = sel; 95 new_ra->next = ra; 96 *rap = new_ra; 97 sock_hold(sk); 98 write_unlock_bh(&ip6_ra_lock); 99 return 0; 100 } 101 102 static 103 struct ipv6_txoptions *ipv6_update_options(struct sock *sk, 104 struct ipv6_txoptions *opt) 105 { 106 if (inet_sk(sk)->is_icsk) { 107 if (opt && 108 !((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) && 109 inet_sk(sk)->inet_daddr != LOOPBACK4_IPV6) { 110 struct inet_connection_sock *icsk = inet_csk(sk); 111 icsk->icsk_ext_hdr_len = opt->opt_flen + opt->opt_nflen; 112 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie); 113 } 114 opt = xchg(&inet6_sk(sk)->opt, opt); 115 } else { 116 write_lock(&sk->sk_dst_lock); 117 opt = xchg(&inet6_sk(sk)->opt, opt); 118 write_unlock(&sk->sk_dst_lock); 119 } 120 sk_dst_reset(sk); 121 122 return opt; 123 } 124 125 static int do_ipv6_setsockopt(struct sock *sk, int level, int optname, 126 char __user *optval, unsigned int optlen) 127 { 128 struct ipv6_pinfo *np = inet6_sk(sk); 129 struct net *net = sock_net(sk); 130 int val, valbool; 131 int retv = -ENOPROTOOPT; 132 133 if (optval == NULL) 134 val=0; 135 else { 136 if (optlen >= sizeof(int)) { 137 if (get_user(val, (int __user *) optval)) 138 return -EFAULT; 139 } else 140 val = 0; 141 } 142 143 valbool = (val!=0); 144 145 if (ip6_mroute_opt(optname)) 146 return ip6_mroute_setsockopt(sk, optname, optval, optlen); 147 148 lock_sock(sk); 149 150 switch (optname) { 151 152 case IPV6_ADDRFORM: 153 if (optlen < sizeof(int)) 154 goto e_inval; 155 if (val == PF_INET) { 156 struct ipv6_txoptions *opt; 157 struct sk_buff *pktopt; 158 159 if (sk->sk_type == SOCK_RAW) 160 break; 161 162 if (sk->sk_protocol == IPPROTO_UDP || 163 sk->sk_protocol == IPPROTO_UDPLITE) { 164 struct udp_sock *up = udp_sk(sk); 165 if (up->pending == AF_INET6) { 166 retv = -EBUSY; 167 break; 168 } 169 } else if (sk->sk_protocol != IPPROTO_TCP) 170 break; 171 172 if (sk->sk_state != TCP_ESTABLISHED) { 173 retv = -ENOTCONN; 174 break; 175 } 176 177 if (ipv6_only_sock(sk) || 178 !ipv6_addr_v4mapped(&np->daddr)) { 179 retv = -EADDRNOTAVAIL; 180 break; 181 } 182 183 fl6_free_socklist(sk); 184 ipv6_sock_mc_close(sk); 185 186 /* 187 * Sock is moving from IPv6 to IPv4 (sk_prot), so 188 * remove it from the refcnt debug socks count in the 189 * original family... 190 */ 191 sk_refcnt_debug_dec(sk); 192 193 if (sk->sk_protocol == IPPROTO_TCP) { 194 struct inet_connection_sock *icsk = inet_csk(sk); 195 local_bh_disable(); 196 sock_prot_inuse_add(net, sk->sk_prot, -1); 197 sock_prot_inuse_add(net, &tcp_prot, 1); 198 local_bh_enable(); 199 sk->sk_prot = &tcp_prot; 200 icsk->icsk_af_ops = &ipv4_specific; 201 sk->sk_socket->ops = &inet_stream_ops; 202 sk->sk_family = PF_INET; 203 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie); 204 } else { 205 struct proto *prot = &udp_prot; 206 207 if (sk->sk_protocol == IPPROTO_UDPLITE) 208 prot = &udplite_prot; 209 local_bh_disable(); 210 sock_prot_inuse_add(net, sk->sk_prot, -1); 211 sock_prot_inuse_add(net, prot, 1); 212 local_bh_enable(); 213 sk->sk_prot = prot; 214 sk->sk_socket->ops = &inet_dgram_ops; 215 sk->sk_family = PF_INET; 216 } 217 opt = xchg(&np->opt, NULL); 218 if (opt) 219 sock_kfree_s(sk, opt, opt->tot_len); 220 pktopt = xchg(&np->pktoptions, NULL); 221 kfree_skb(pktopt); 222 223 sk->sk_destruct = inet_sock_destruct; 224 /* 225 * ... and add it to the refcnt debug socks count 226 * in the new family. -acme 227 */ 228 sk_refcnt_debug_inc(sk); 229 module_put(THIS_MODULE); 230 retv = 0; 231 break; 232 } 233 goto e_inval; 234 235 case IPV6_V6ONLY: 236 if (optlen < sizeof(int) || 237 inet_sk(sk)->inet_num) 238 goto e_inval; 239 np->ipv6only = valbool; 240 retv = 0; 241 break; 242 243 case IPV6_RECVPKTINFO: 244 if (optlen < sizeof(int)) 245 goto e_inval; 246 np->rxopt.bits.rxinfo = valbool; 247 retv = 0; 248 break; 249 250 case IPV6_2292PKTINFO: 251 if (optlen < sizeof(int)) 252 goto e_inval; 253 np->rxopt.bits.rxoinfo = valbool; 254 retv = 0; 255 break; 256 257 case IPV6_RECVHOPLIMIT: 258 if (optlen < sizeof(int)) 259 goto e_inval; 260 np->rxopt.bits.rxhlim = valbool; 261 retv = 0; 262 break; 263 264 case IPV6_2292HOPLIMIT: 265 if (optlen < sizeof(int)) 266 goto e_inval; 267 np->rxopt.bits.rxohlim = valbool; 268 retv = 0; 269 break; 270 271 case IPV6_RECVRTHDR: 272 if (optlen < sizeof(int)) 273 goto e_inval; 274 np->rxopt.bits.srcrt = valbool; 275 retv = 0; 276 break; 277 278 case IPV6_2292RTHDR: 279 if (optlen < sizeof(int)) 280 goto e_inval; 281 np->rxopt.bits.osrcrt = valbool; 282 retv = 0; 283 break; 284 285 case IPV6_RECVHOPOPTS: 286 if (optlen < sizeof(int)) 287 goto e_inval; 288 np->rxopt.bits.hopopts = valbool; 289 retv = 0; 290 break; 291 292 case IPV6_2292HOPOPTS: 293 if (optlen < sizeof(int)) 294 goto e_inval; 295 np->rxopt.bits.ohopopts = valbool; 296 retv = 0; 297 break; 298 299 case IPV6_RECVDSTOPTS: 300 if (optlen < sizeof(int)) 301 goto e_inval; 302 np->rxopt.bits.dstopts = valbool; 303 retv = 0; 304 break; 305 306 case IPV6_2292DSTOPTS: 307 if (optlen < sizeof(int)) 308 goto e_inval; 309 np->rxopt.bits.odstopts = valbool; 310 retv = 0; 311 break; 312 313 case IPV6_TCLASS: 314 if (optlen < sizeof(int)) 315 goto e_inval; 316 if (val < -1 || val > 0xff) 317 goto e_inval; 318 /* RFC 3542, 6.5: default traffic class of 0x0 */ 319 if (val == -1) 320 val = 0; 321 np->tclass = val; 322 retv = 0; 323 break; 324 325 case IPV6_RECVTCLASS: 326 if (optlen < sizeof(int)) 327 goto e_inval; 328 np->rxopt.bits.rxtclass = valbool; 329 retv = 0; 330 break; 331 332 case IPV6_FLOWINFO: 333 if (optlen < sizeof(int)) 334 goto e_inval; 335 np->rxopt.bits.rxflow = valbool; 336 retv = 0; 337 break; 338 339 case IPV6_HOPOPTS: 340 case IPV6_RTHDRDSTOPTS: 341 case IPV6_RTHDR: 342 case IPV6_DSTOPTS: 343 { 344 struct ipv6_txoptions *opt; 345 346 /* remove any sticky options header with a zero option 347 * length, per RFC3542. 348 */ 349 if (optlen == 0) 350 optval = NULL; 351 else if (optval == NULL) 352 goto e_inval; 353 else if (optlen < sizeof(struct ipv6_opt_hdr) || 354 optlen & 0x7 || optlen > 8 * 255) 355 goto e_inval; 356 357 /* hop-by-hop / destination options are privileged option */ 358 retv = -EPERM; 359 if (optname != IPV6_RTHDR && !capable(CAP_NET_RAW)) 360 break; 361 362 opt = ipv6_renew_options(sk, np->opt, optname, 363 (struct ipv6_opt_hdr __user *)optval, 364 optlen); 365 if (IS_ERR(opt)) { 366 retv = PTR_ERR(opt); 367 break; 368 } 369 370 /* routing header option needs extra check */ 371 retv = -EINVAL; 372 if (optname == IPV6_RTHDR && opt && opt->srcrt) { 373 struct ipv6_rt_hdr *rthdr = opt->srcrt; 374 switch (rthdr->type) { 375 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 376 case IPV6_SRCRT_TYPE_2: 377 if (rthdr->hdrlen != 2 || 378 rthdr->segments_left != 1) 379 goto sticky_done; 380 381 break; 382 #endif 383 default: 384 goto sticky_done; 385 } 386 } 387 388 retv = 0; 389 opt = ipv6_update_options(sk, opt); 390 sticky_done: 391 if (opt) 392 sock_kfree_s(sk, opt, opt->tot_len); 393 break; 394 } 395 396 case IPV6_PKTINFO: 397 { 398 struct in6_pktinfo pkt; 399 400 if (optlen == 0) 401 goto e_inval; 402 else if (optlen < sizeof(struct in6_pktinfo) || optval == NULL) 403 goto e_inval; 404 405 if (copy_from_user(&pkt, optval, sizeof(struct in6_pktinfo))) { 406 retv = -EFAULT; 407 break; 408 } 409 if (sk->sk_bound_dev_if && pkt.ipi6_ifindex != sk->sk_bound_dev_if) 410 goto e_inval; 411 412 np->sticky_pktinfo.ipi6_ifindex = pkt.ipi6_ifindex; 413 ipv6_addr_copy(&np->sticky_pktinfo.ipi6_addr, &pkt.ipi6_addr); 414 retv = 0; 415 break; 416 } 417 418 case IPV6_2292PKTOPTIONS: 419 { 420 struct ipv6_txoptions *opt = NULL; 421 struct msghdr msg; 422 struct flowi fl; 423 int junk; 424 425 fl.fl6_flowlabel = 0; 426 fl.oif = sk->sk_bound_dev_if; 427 fl.mark = sk->sk_mark; 428 429 if (optlen == 0) 430 goto update; 431 432 /* 1K is probably excessive 433 * 1K is surely not enough, 2K per standard header is 16K. 434 */ 435 retv = -EINVAL; 436 if (optlen > 64*1024) 437 break; 438 439 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL); 440 retv = -ENOBUFS; 441 if (opt == NULL) 442 break; 443 444 memset(opt, 0, sizeof(*opt)); 445 opt->tot_len = sizeof(*opt) + optlen; 446 retv = -EFAULT; 447 if (copy_from_user(opt+1, optval, optlen)) 448 goto done; 449 450 msg.msg_controllen = optlen; 451 msg.msg_control = (void*)(opt+1); 452 453 retv = datagram_send_ctl(net, &msg, &fl, opt, &junk, &junk); 454 if (retv) 455 goto done; 456 update: 457 retv = 0; 458 opt = ipv6_update_options(sk, opt); 459 done: 460 if (opt) 461 sock_kfree_s(sk, opt, opt->tot_len); 462 break; 463 } 464 case IPV6_UNICAST_HOPS: 465 if (optlen < sizeof(int)) 466 goto e_inval; 467 if (val > 255 || val < -1) 468 goto e_inval; 469 np->hop_limit = val; 470 retv = 0; 471 break; 472 473 case IPV6_MULTICAST_HOPS: 474 if (sk->sk_type == SOCK_STREAM) 475 break; 476 if (optlen < sizeof(int)) 477 goto e_inval; 478 if (val > 255 || val < -1) 479 goto e_inval; 480 np->mcast_hops = val; 481 retv = 0; 482 break; 483 484 case IPV6_MULTICAST_LOOP: 485 if (optlen < sizeof(int)) 486 goto e_inval; 487 if (val != valbool) 488 goto e_inval; 489 np->mc_loop = valbool; 490 retv = 0; 491 break; 492 493 case IPV6_MULTICAST_IF: 494 if (sk->sk_type == SOCK_STREAM) 495 break; 496 if (optlen < sizeof(int)) 497 goto e_inval; 498 499 if (val) { 500 struct net_device *dev; 501 502 if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != val) 503 goto e_inval; 504 505 dev = dev_get_by_index(net, val); 506 if (!dev) { 507 retv = -ENODEV; 508 break; 509 } 510 dev_put(dev); 511 } 512 np->mcast_oif = val; 513 retv = 0; 514 break; 515 case IPV6_ADD_MEMBERSHIP: 516 case IPV6_DROP_MEMBERSHIP: 517 { 518 struct ipv6_mreq mreq; 519 520 if (optlen < sizeof(struct ipv6_mreq)) 521 goto e_inval; 522 523 retv = -EPROTO; 524 if (inet_sk(sk)->is_icsk) 525 break; 526 527 retv = -EFAULT; 528 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq))) 529 break; 530 531 if (optname == IPV6_ADD_MEMBERSHIP) 532 retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr); 533 else 534 retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr); 535 break; 536 } 537 case IPV6_JOIN_ANYCAST: 538 case IPV6_LEAVE_ANYCAST: 539 { 540 struct ipv6_mreq mreq; 541 542 if (optlen < sizeof(struct ipv6_mreq)) 543 goto e_inval; 544 545 retv = -EFAULT; 546 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq))) 547 break; 548 549 if (optname == IPV6_JOIN_ANYCAST) 550 retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr); 551 else 552 retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr); 553 break; 554 } 555 case MCAST_JOIN_GROUP: 556 case MCAST_LEAVE_GROUP: 557 { 558 struct group_req greq; 559 struct sockaddr_in6 *psin6; 560 561 if (optlen < sizeof(struct group_req)) 562 goto e_inval; 563 564 retv = -EFAULT; 565 if (copy_from_user(&greq, optval, sizeof(struct group_req))) 566 break; 567 if (greq.gr_group.ss_family != AF_INET6) { 568 retv = -EADDRNOTAVAIL; 569 break; 570 } 571 psin6 = (struct sockaddr_in6 *)&greq.gr_group; 572 if (optname == MCAST_JOIN_GROUP) 573 retv = ipv6_sock_mc_join(sk, greq.gr_interface, 574 &psin6->sin6_addr); 575 else 576 retv = ipv6_sock_mc_drop(sk, greq.gr_interface, 577 &psin6->sin6_addr); 578 break; 579 } 580 case MCAST_JOIN_SOURCE_GROUP: 581 case MCAST_LEAVE_SOURCE_GROUP: 582 case MCAST_BLOCK_SOURCE: 583 case MCAST_UNBLOCK_SOURCE: 584 { 585 struct group_source_req greqs; 586 int omode, add; 587 588 if (optlen < sizeof(struct group_source_req)) 589 goto e_inval; 590 if (copy_from_user(&greqs, optval, sizeof(greqs))) { 591 retv = -EFAULT; 592 break; 593 } 594 if (greqs.gsr_group.ss_family != AF_INET6 || 595 greqs.gsr_source.ss_family != AF_INET6) { 596 retv = -EADDRNOTAVAIL; 597 break; 598 } 599 if (optname == MCAST_BLOCK_SOURCE) { 600 omode = MCAST_EXCLUDE; 601 add = 1; 602 } else if (optname == MCAST_UNBLOCK_SOURCE) { 603 omode = MCAST_EXCLUDE; 604 add = 0; 605 } else if (optname == MCAST_JOIN_SOURCE_GROUP) { 606 struct sockaddr_in6 *psin6; 607 608 psin6 = (struct sockaddr_in6 *)&greqs.gsr_group; 609 retv = ipv6_sock_mc_join(sk, greqs.gsr_interface, 610 &psin6->sin6_addr); 611 /* prior join w/ different source is ok */ 612 if (retv && retv != -EADDRINUSE) 613 break; 614 omode = MCAST_INCLUDE; 615 add = 1; 616 } else /* MCAST_LEAVE_SOURCE_GROUP */ { 617 omode = MCAST_INCLUDE; 618 add = 0; 619 } 620 retv = ip6_mc_source(add, omode, sk, &greqs); 621 break; 622 } 623 case MCAST_MSFILTER: 624 { 625 extern int sysctl_mld_max_msf; 626 struct group_filter *gsf; 627 628 if (optlen < GROUP_FILTER_SIZE(0)) 629 goto e_inval; 630 if (optlen > sysctl_optmem_max) { 631 retv = -ENOBUFS; 632 break; 633 } 634 gsf = kmalloc(optlen,GFP_KERNEL); 635 if (!gsf) { 636 retv = -ENOBUFS; 637 break; 638 } 639 retv = -EFAULT; 640 if (copy_from_user(gsf, optval, optlen)) { 641 kfree(gsf); 642 break; 643 } 644 /* numsrc >= (4G-140)/128 overflow in 32 bits */ 645 if (gsf->gf_numsrc >= 0x1ffffffU || 646 gsf->gf_numsrc > sysctl_mld_max_msf) { 647 kfree(gsf); 648 retv = -ENOBUFS; 649 break; 650 } 651 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) { 652 kfree(gsf); 653 retv = -EINVAL; 654 break; 655 } 656 retv = ip6_mc_msfilter(sk, gsf); 657 kfree(gsf); 658 659 break; 660 } 661 case IPV6_ROUTER_ALERT: 662 if (optlen < sizeof(int)) 663 goto e_inval; 664 retv = ip6_ra_control(sk, val); 665 break; 666 case IPV6_MTU_DISCOVER: 667 if (optlen < sizeof(int)) 668 goto e_inval; 669 if (val < IP_PMTUDISC_DONT || val > IP_PMTUDISC_PROBE) 670 goto e_inval; 671 np->pmtudisc = val; 672 retv = 0; 673 break; 674 case IPV6_MTU: 675 if (optlen < sizeof(int)) 676 goto e_inval; 677 if (val && val < IPV6_MIN_MTU) 678 goto e_inval; 679 np->frag_size = val; 680 retv = 0; 681 break; 682 case IPV6_RECVERR: 683 if (optlen < sizeof(int)) 684 goto e_inval; 685 np->recverr = valbool; 686 if (!val) 687 skb_queue_purge(&sk->sk_error_queue); 688 retv = 0; 689 break; 690 case IPV6_FLOWINFO_SEND: 691 if (optlen < sizeof(int)) 692 goto e_inval; 693 np->sndflow = valbool; 694 retv = 0; 695 break; 696 case IPV6_FLOWLABEL_MGR: 697 retv = ipv6_flowlabel_opt(sk, optval, optlen); 698 break; 699 case IPV6_IPSEC_POLICY: 700 case IPV6_XFRM_POLICY: 701 retv = -EPERM; 702 if (!capable(CAP_NET_ADMIN)) 703 break; 704 retv = xfrm_user_policy(sk, optname, optval, optlen); 705 break; 706 707 case IPV6_ADDR_PREFERENCES: 708 { 709 unsigned int pref = 0; 710 unsigned int prefmask = ~0; 711 712 if (optlen < sizeof(int)) 713 goto e_inval; 714 715 retv = -EINVAL; 716 717 /* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */ 718 switch (val & (IPV6_PREFER_SRC_PUBLIC| 719 IPV6_PREFER_SRC_TMP| 720 IPV6_PREFER_SRC_PUBTMP_DEFAULT)) { 721 case IPV6_PREFER_SRC_PUBLIC: 722 pref |= IPV6_PREFER_SRC_PUBLIC; 723 break; 724 case IPV6_PREFER_SRC_TMP: 725 pref |= IPV6_PREFER_SRC_TMP; 726 break; 727 case IPV6_PREFER_SRC_PUBTMP_DEFAULT: 728 break; 729 case 0: 730 goto pref_skip_pubtmp; 731 default: 732 goto e_inval; 733 } 734 735 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC| 736 IPV6_PREFER_SRC_TMP); 737 pref_skip_pubtmp: 738 739 /* check HOME/COA conflicts */ 740 switch (val & (IPV6_PREFER_SRC_HOME|IPV6_PREFER_SRC_COA)) { 741 case IPV6_PREFER_SRC_HOME: 742 break; 743 case IPV6_PREFER_SRC_COA: 744 pref |= IPV6_PREFER_SRC_COA; 745 case 0: 746 goto pref_skip_coa; 747 default: 748 goto e_inval; 749 } 750 751 prefmask &= ~IPV6_PREFER_SRC_COA; 752 pref_skip_coa: 753 754 /* check CGA/NONCGA conflicts */ 755 switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) { 756 case IPV6_PREFER_SRC_CGA: 757 case IPV6_PREFER_SRC_NONCGA: 758 case 0: 759 break; 760 default: 761 goto e_inval; 762 } 763 764 np->srcprefs = (np->srcprefs & prefmask) | pref; 765 retv = 0; 766 767 break; 768 } 769 } 770 771 release_sock(sk); 772 773 return retv; 774 775 e_inval: 776 release_sock(sk); 777 return -EINVAL; 778 } 779 780 int ipv6_setsockopt(struct sock *sk, int level, int optname, 781 char __user *optval, unsigned int optlen) 782 { 783 int err; 784 785 if (level == SOL_IP && sk->sk_type != SOCK_RAW) 786 return udp_prot.setsockopt(sk, level, optname, optval, optlen); 787 788 if (level != SOL_IPV6) 789 return -ENOPROTOOPT; 790 791 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen); 792 #ifdef CONFIG_NETFILTER 793 /* we need to exclude all possible ENOPROTOOPTs except default case */ 794 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY && 795 optname != IPV6_XFRM_POLICY) { 796 lock_sock(sk); 797 err = nf_setsockopt(sk, PF_INET6, optname, optval, 798 optlen); 799 release_sock(sk); 800 } 801 #endif 802 return err; 803 } 804 805 EXPORT_SYMBOL(ipv6_setsockopt); 806 807 #ifdef CONFIG_COMPAT 808 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname, 809 char __user *optval, unsigned int optlen) 810 { 811 int err; 812 813 if (level == SOL_IP && sk->sk_type != SOCK_RAW) { 814 if (udp_prot.compat_setsockopt != NULL) 815 return udp_prot.compat_setsockopt(sk, level, optname, 816 optval, optlen); 817 return udp_prot.setsockopt(sk, level, optname, optval, optlen); 818 } 819 820 if (level != SOL_IPV6) 821 return -ENOPROTOOPT; 822 823 if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER) 824 return compat_mc_setsockopt(sk, level, optname, optval, optlen, 825 ipv6_setsockopt); 826 827 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen); 828 #ifdef CONFIG_NETFILTER 829 /* we need to exclude all possible ENOPROTOOPTs except default case */ 830 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY && 831 optname != IPV6_XFRM_POLICY) { 832 lock_sock(sk); 833 err = compat_nf_setsockopt(sk, PF_INET6, optname, 834 optval, optlen); 835 release_sock(sk); 836 } 837 #endif 838 return err; 839 } 840 841 EXPORT_SYMBOL(compat_ipv6_setsockopt); 842 #endif 843 844 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt, 845 int optname, char __user *optval, int len) 846 { 847 struct ipv6_opt_hdr *hdr; 848 849 if (!opt) 850 return 0; 851 852 switch(optname) { 853 case IPV6_HOPOPTS: 854 hdr = opt->hopopt; 855 break; 856 case IPV6_RTHDRDSTOPTS: 857 hdr = opt->dst0opt; 858 break; 859 case IPV6_RTHDR: 860 hdr = (struct ipv6_opt_hdr *)opt->srcrt; 861 break; 862 case IPV6_DSTOPTS: 863 hdr = opt->dst1opt; 864 break; 865 default: 866 return -EINVAL; /* should not happen */ 867 } 868 869 if (!hdr) 870 return 0; 871 872 len = min_t(unsigned int, len, ipv6_optlen(hdr)); 873 if (copy_to_user(optval, hdr, len)) 874 return -EFAULT; 875 return len; 876 } 877 878 static int do_ipv6_getsockopt(struct sock *sk, int level, int optname, 879 char __user *optval, int __user *optlen) 880 { 881 struct ipv6_pinfo *np = inet6_sk(sk); 882 int len; 883 int val; 884 885 if (ip6_mroute_opt(optname)) 886 return ip6_mroute_getsockopt(sk, optname, optval, optlen); 887 888 if (get_user(len, optlen)) 889 return -EFAULT; 890 switch (optname) { 891 case IPV6_ADDRFORM: 892 if (sk->sk_protocol != IPPROTO_UDP && 893 sk->sk_protocol != IPPROTO_UDPLITE && 894 sk->sk_protocol != IPPROTO_TCP) 895 return -ENOPROTOOPT; 896 if (sk->sk_state != TCP_ESTABLISHED) 897 return -ENOTCONN; 898 val = sk->sk_family; 899 break; 900 case MCAST_MSFILTER: 901 { 902 struct group_filter gsf; 903 int err; 904 905 if (len < GROUP_FILTER_SIZE(0)) 906 return -EINVAL; 907 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) 908 return -EFAULT; 909 if (gsf.gf_group.ss_family != AF_INET6) 910 return -EADDRNOTAVAIL; 911 lock_sock(sk); 912 err = ip6_mc_msfget(sk, &gsf, 913 (struct group_filter __user *)optval, optlen); 914 release_sock(sk); 915 return err; 916 } 917 918 case IPV6_2292PKTOPTIONS: 919 { 920 struct msghdr msg; 921 struct sk_buff *skb; 922 923 if (sk->sk_type != SOCK_STREAM) 924 return -ENOPROTOOPT; 925 926 msg.msg_control = optval; 927 msg.msg_controllen = len; 928 msg.msg_flags = 0; 929 930 lock_sock(sk); 931 skb = np->pktoptions; 932 if (skb) 933 atomic_inc(&skb->users); 934 release_sock(sk); 935 936 if (skb) { 937 int err = datagram_recv_ctl(sk, &msg, skb); 938 kfree_skb(skb); 939 if (err) 940 return err; 941 } else { 942 if (np->rxopt.bits.rxinfo) { 943 struct in6_pktinfo src_info; 944 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif : 945 np->sticky_pktinfo.ipi6_ifindex; 946 np->mcast_oif? ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr) : 947 ipv6_addr_copy(&src_info.ipi6_addr, &(np->sticky_pktinfo.ipi6_addr)); 948 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info); 949 } 950 if (np->rxopt.bits.rxhlim) { 951 int hlim = np->mcast_hops; 952 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim); 953 } 954 if (np->rxopt.bits.rxoinfo) { 955 struct in6_pktinfo src_info; 956 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif : 957 np->sticky_pktinfo.ipi6_ifindex; 958 np->mcast_oif? ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr) : 959 ipv6_addr_copy(&src_info.ipi6_addr, &(np->sticky_pktinfo.ipi6_addr)); 960 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info); 961 } 962 if (np->rxopt.bits.rxohlim) { 963 int hlim = np->mcast_hops; 964 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim); 965 } 966 } 967 len -= msg.msg_controllen; 968 return put_user(len, optlen); 969 } 970 case IPV6_MTU: 971 { 972 struct dst_entry *dst; 973 val = 0; 974 lock_sock(sk); 975 dst = sk_dst_get(sk); 976 if (dst) { 977 val = dst_mtu(dst); 978 dst_release(dst); 979 } 980 release_sock(sk); 981 if (!val) 982 return -ENOTCONN; 983 break; 984 } 985 986 case IPV6_V6ONLY: 987 val = np->ipv6only; 988 break; 989 990 case IPV6_RECVPKTINFO: 991 val = np->rxopt.bits.rxinfo; 992 break; 993 994 case IPV6_2292PKTINFO: 995 val = np->rxopt.bits.rxoinfo; 996 break; 997 998 case IPV6_RECVHOPLIMIT: 999 val = np->rxopt.bits.rxhlim; 1000 break; 1001 1002 case IPV6_2292HOPLIMIT: 1003 val = np->rxopt.bits.rxohlim; 1004 break; 1005 1006 case IPV6_RECVRTHDR: 1007 val = np->rxopt.bits.srcrt; 1008 break; 1009 1010 case IPV6_2292RTHDR: 1011 val = np->rxopt.bits.osrcrt; 1012 break; 1013 1014 case IPV6_HOPOPTS: 1015 case IPV6_RTHDRDSTOPTS: 1016 case IPV6_RTHDR: 1017 case IPV6_DSTOPTS: 1018 { 1019 1020 lock_sock(sk); 1021 len = ipv6_getsockopt_sticky(sk, np->opt, 1022 optname, optval, len); 1023 release_sock(sk); 1024 /* check if ipv6_getsockopt_sticky() returns err code */ 1025 if (len < 0) 1026 return len; 1027 return put_user(len, optlen); 1028 } 1029 1030 case IPV6_RECVHOPOPTS: 1031 val = np->rxopt.bits.hopopts; 1032 break; 1033 1034 case IPV6_2292HOPOPTS: 1035 val = np->rxopt.bits.ohopopts; 1036 break; 1037 1038 case IPV6_RECVDSTOPTS: 1039 val = np->rxopt.bits.dstopts; 1040 break; 1041 1042 case IPV6_2292DSTOPTS: 1043 val = np->rxopt.bits.odstopts; 1044 break; 1045 1046 case IPV6_TCLASS: 1047 val = np->tclass; 1048 break; 1049 1050 case IPV6_RECVTCLASS: 1051 val = np->rxopt.bits.rxtclass; 1052 break; 1053 1054 case IPV6_FLOWINFO: 1055 val = np->rxopt.bits.rxflow; 1056 break; 1057 1058 case IPV6_UNICAST_HOPS: 1059 case IPV6_MULTICAST_HOPS: 1060 { 1061 struct dst_entry *dst; 1062 1063 if (optname == IPV6_UNICAST_HOPS) 1064 val = np->hop_limit; 1065 else 1066 val = np->mcast_hops; 1067 1068 dst = sk_dst_get(sk); 1069 if (dst) { 1070 if (val < 0) 1071 val = ip6_dst_hoplimit(dst); 1072 dst_release(dst); 1073 } 1074 if (val < 0) 1075 val = sock_net(sk)->ipv6.devconf_all->hop_limit; 1076 break; 1077 } 1078 1079 case IPV6_MULTICAST_LOOP: 1080 val = np->mc_loop; 1081 break; 1082 1083 case IPV6_MULTICAST_IF: 1084 val = np->mcast_oif; 1085 break; 1086 1087 case IPV6_MTU_DISCOVER: 1088 val = np->pmtudisc; 1089 break; 1090 1091 case IPV6_RECVERR: 1092 val = np->recverr; 1093 break; 1094 1095 case IPV6_FLOWINFO_SEND: 1096 val = np->sndflow; 1097 break; 1098 1099 case IPV6_ADDR_PREFERENCES: 1100 val = 0; 1101 1102 if (np->srcprefs & IPV6_PREFER_SRC_TMP) 1103 val |= IPV6_PREFER_SRC_TMP; 1104 else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC) 1105 val |= IPV6_PREFER_SRC_PUBLIC; 1106 else { 1107 /* XXX: should we return system default? */ 1108 val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT; 1109 } 1110 1111 if (np->srcprefs & IPV6_PREFER_SRC_COA) 1112 val |= IPV6_PREFER_SRC_COA; 1113 else 1114 val |= IPV6_PREFER_SRC_HOME; 1115 break; 1116 1117 default: 1118 return -ENOPROTOOPT; 1119 } 1120 len = min_t(unsigned int, sizeof(int), len); 1121 if(put_user(len, optlen)) 1122 return -EFAULT; 1123 if(copy_to_user(optval,&val,len)) 1124 return -EFAULT; 1125 return 0; 1126 } 1127 1128 int ipv6_getsockopt(struct sock *sk, int level, int optname, 1129 char __user *optval, int __user *optlen) 1130 { 1131 int err; 1132 1133 if (level == SOL_IP && sk->sk_type != SOCK_RAW) 1134 return udp_prot.getsockopt(sk, level, optname, optval, optlen); 1135 1136 if(level != SOL_IPV6) 1137 return -ENOPROTOOPT; 1138 1139 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen); 1140 #ifdef CONFIG_NETFILTER 1141 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1142 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) { 1143 int len; 1144 1145 if (get_user(len, optlen)) 1146 return -EFAULT; 1147 1148 lock_sock(sk); 1149 err = nf_getsockopt(sk, PF_INET6, optname, optval, 1150 &len); 1151 release_sock(sk); 1152 if (err >= 0) 1153 err = put_user(len, optlen); 1154 } 1155 #endif 1156 return err; 1157 } 1158 1159 EXPORT_SYMBOL(ipv6_getsockopt); 1160 1161 #ifdef CONFIG_COMPAT 1162 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname, 1163 char __user *optval, int __user *optlen) 1164 { 1165 int err; 1166 1167 if (level == SOL_IP && sk->sk_type != SOCK_RAW) { 1168 if (udp_prot.compat_getsockopt != NULL) 1169 return udp_prot.compat_getsockopt(sk, level, optname, 1170 optval, optlen); 1171 return udp_prot.getsockopt(sk, level, optname, optval, optlen); 1172 } 1173 1174 if (level != SOL_IPV6) 1175 return -ENOPROTOOPT; 1176 1177 if (optname == MCAST_MSFILTER) 1178 return compat_mc_getsockopt(sk, level, optname, optval, optlen, 1179 ipv6_getsockopt); 1180 1181 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen); 1182 #ifdef CONFIG_NETFILTER 1183 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1184 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) { 1185 int len; 1186 1187 if (get_user(len, optlen)) 1188 return -EFAULT; 1189 1190 lock_sock(sk); 1191 err = compat_nf_getsockopt(sk, PF_INET6, 1192 optname, optval, &len); 1193 release_sock(sk); 1194 if (err >= 0) 1195 err = put_user(len, optlen); 1196 } 1197 #endif 1198 return err; 1199 } 1200 1201 EXPORT_SYMBOL(compat_ipv6_getsockopt); 1202 #endif 1203 1204