ipv6_sockglue.c revision 2a38e6d5aed24bb7f0211e0819fac8c32c2b5791
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#include <linux/slab.h> 40 41#include <net/sock.h> 42#include <net/snmp.h> 43#include <net/ipv6.h> 44#include <net/ndisc.h> 45#include <net/protocol.h> 46#include <net/transp_v6.h> 47#include <net/ip6_route.h> 48#include <net/addrconf.h> 49#include <net/inet_common.h> 50#include <net/tcp.h> 51#include <net/udp.h> 52#include <net/udplite.h> 53#include <net/xfrm.h> 54#include <net/compat.h> 55 56#include <asm/uaccess.h> 57 58struct ip6_ra_chain *ip6_ra_chain; 59DEFINE_RWLOCK(ip6_ra_lock); 60 61int ip6_ra_control(struct sock *sk, int sel) 62{ 63 struct ip6_ra_chain *ra, *new_ra, **rap; 64 65 /* RA packet may be delivered ONLY to IPPROTO_RAW socket */ 66 if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num != IPPROTO_RAW) 67 return -ENOPROTOOPT; 68 69 new_ra = (sel>=0) ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL; 70 71 write_lock_bh(&ip6_ra_lock); 72 for (rap = &ip6_ra_chain; (ra=*rap) != NULL; rap = &ra->next) { 73 if (ra->sk == sk) { 74 if (sel>=0) { 75 write_unlock_bh(&ip6_ra_lock); 76 kfree(new_ra); 77 return -EADDRINUSE; 78 } 79 80 *rap = ra->next; 81 write_unlock_bh(&ip6_ra_lock); 82 83 sock_put(sk); 84 kfree(ra); 85 return 0; 86 } 87 } 88 if (new_ra == NULL) { 89 write_unlock_bh(&ip6_ra_lock); 90 return -ENOBUFS; 91 } 92 new_ra->sk = sk; 93 new_ra->sel = sel; 94 new_ra->next = ra; 95 *rap = new_ra; 96 sock_hold(sk); 97 write_unlock_bh(&ip6_ra_lock); 98 return 0; 99} 100 101static 102struct ipv6_txoptions *ipv6_update_options(struct sock *sk, 103 struct ipv6_txoptions *opt) 104{ 105 if (inet_sk(sk)->is_icsk) { 106 if (opt && 107 !((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) && 108 inet_sk(sk)->inet_daddr != LOOPBACK4_IPV6) { 109 struct inet_connection_sock *icsk = inet_csk(sk); 110 icsk->icsk_ext_hdr_len = opt->opt_flen + opt->opt_nflen; 111 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie); 112 } 113 opt = xchg(&inet6_sk(sk)->opt, opt); 114 } else { 115 spin_lock(&sk->sk_dst_lock); 116 opt = xchg(&inet6_sk(sk)->opt, opt); 117 spin_unlock(&sk->sk_dst_lock); 118 } 119 sk_dst_reset(sk); 120 121 return opt; 122} 123 124static int do_ipv6_setsockopt(struct sock *sk, int level, int optname, 125 char __user *optval, unsigned int optlen) 126{ 127 struct ipv6_pinfo *np = inet6_sk(sk); 128 struct net *net = sock_net(sk); 129 int val, valbool; 130 int retv = -ENOPROTOOPT; 131 132 if (optval == NULL) 133 val=0; 134 else { 135 if (optlen >= sizeof(int)) { 136 if (get_user(val, (int __user *) optval)) 137 return -EFAULT; 138 } else 139 val = 0; 140 } 141 142 valbool = (val!=0); 143 144 if (ip6_mroute_opt(optname)) 145 return ip6_mroute_setsockopt(sk, optname, optval, optlen); 146 147 lock_sock(sk); 148 149 switch (optname) { 150 151 case IPV6_ADDRFORM: 152 if (optlen < sizeof(int)) 153 goto e_inval; 154 if (val == PF_INET) { 155 struct ipv6_txoptions *opt; 156 struct sk_buff *pktopt; 157 158 if (sk->sk_type == SOCK_RAW) 159 break; 160 161 if (sk->sk_protocol == IPPROTO_UDP || 162 sk->sk_protocol == IPPROTO_UDPLITE) { 163 struct udp_sock *up = udp_sk(sk); 164 if (up->pending == AF_INET6) { 165 retv = -EBUSY; 166 break; 167 } 168 } else if (sk->sk_protocol != IPPROTO_TCP) 169 break; 170 171 if (sk->sk_state != TCP_ESTABLISHED) { 172 retv = -ENOTCONN; 173 break; 174 } 175 176 if (ipv6_only_sock(sk) || 177 !ipv6_addr_v4mapped(&np->daddr)) { 178 retv = -EADDRNOTAVAIL; 179 break; 180 } 181 182 fl6_free_socklist(sk); 183 ipv6_sock_mc_close(sk); 184 185 /* 186 * Sock is moving from IPv6 to IPv4 (sk_prot), so 187 * remove it from the refcnt debug socks count in the 188 * original family... 189 */ 190 sk_refcnt_debug_dec(sk); 191 192 if (sk->sk_protocol == IPPROTO_TCP) { 193 struct inet_connection_sock *icsk = inet_csk(sk); 194 local_bh_disable(); 195 sock_prot_inuse_add(net, sk->sk_prot, -1); 196 sock_prot_inuse_add(net, &tcp_prot, 1); 197 local_bh_enable(); 198 sk->sk_prot = &tcp_prot; 199 icsk->icsk_af_ops = &ipv4_specific; 200 sk->sk_socket->ops = &inet_stream_ops; 201 sk->sk_family = PF_INET; 202 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie); 203 } else { 204 struct proto *prot = &udp_prot; 205 206 if (sk->sk_protocol == IPPROTO_UDPLITE) 207 prot = &udplite_prot; 208 local_bh_disable(); 209 sock_prot_inuse_add(net, sk->sk_prot, -1); 210 sock_prot_inuse_add(net, prot, 1); 211 local_bh_enable(); 212 sk->sk_prot = prot; 213 sk->sk_socket->ops = &inet_dgram_ops; 214 sk->sk_family = PF_INET; 215 } 216 opt = xchg(&np->opt, NULL); 217 if (opt) 218 sock_kfree_s(sk, opt, opt->tot_len); 219 pktopt = xchg(&np->pktoptions, NULL); 220 kfree_skb(pktopt); 221 222 sk->sk_destruct = inet_sock_destruct; 223 /* 224 * ... and add it to the refcnt debug socks count 225 * in the new family. -acme 226 */ 227 sk_refcnt_debug_inc(sk); 228 module_put(THIS_MODULE); 229 retv = 0; 230 break; 231 } 232 goto e_inval; 233 234 case IPV6_V6ONLY: 235 if (optlen < sizeof(int) || 236 inet_sk(sk)->inet_num) 237 goto e_inval; 238 np->ipv6only = valbool; 239 retv = 0; 240 break; 241 242 case IPV6_RECVPKTINFO: 243 if (optlen < sizeof(int)) 244 goto e_inval; 245 np->rxopt.bits.rxinfo = valbool; 246 retv = 0; 247 break; 248 249 case IPV6_2292PKTINFO: 250 if (optlen < sizeof(int)) 251 goto e_inval; 252 np->rxopt.bits.rxoinfo = valbool; 253 retv = 0; 254 break; 255 256 case IPV6_RECVHOPLIMIT: 257 if (optlen < sizeof(int)) 258 goto e_inval; 259 np->rxopt.bits.rxhlim = valbool; 260 retv = 0; 261 break; 262 263 case IPV6_2292HOPLIMIT: 264 if (optlen < sizeof(int)) 265 goto e_inval; 266 np->rxopt.bits.rxohlim = valbool; 267 retv = 0; 268 break; 269 270 case IPV6_RECVRTHDR: 271 if (optlen < sizeof(int)) 272 goto e_inval; 273 np->rxopt.bits.srcrt = valbool; 274 retv = 0; 275 break; 276 277 case IPV6_2292RTHDR: 278 if (optlen < sizeof(int)) 279 goto e_inval; 280 np->rxopt.bits.osrcrt = valbool; 281 retv = 0; 282 break; 283 284 case IPV6_RECVHOPOPTS: 285 if (optlen < sizeof(int)) 286 goto e_inval; 287 np->rxopt.bits.hopopts = valbool; 288 retv = 0; 289 break; 290 291 case IPV6_2292HOPOPTS: 292 if (optlen < sizeof(int)) 293 goto e_inval; 294 np->rxopt.bits.ohopopts = valbool; 295 retv = 0; 296 break; 297 298 case IPV6_RECVDSTOPTS: 299 if (optlen < sizeof(int)) 300 goto e_inval; 301 np->rxopt.bits.dstopts = valbool; 302 retv = 0; 303 break; 304 305 case IPV6_2292DSTOPTS: 306 if (optlen < sizeof(int)) 307 goto e_inval; 308 np->rxopt.bits.odstopts = valbool; 309 retv = 0; 310 break; 311 312 case IPV6_TCLASS: 313 if (optlen < sizeof(int)) 314 goto e_inval; 315 if (val < -1 || val > 0xff) 316 goto e_inval; 317 /* RFC 3542, 6.5: default traffic class of 0x0 */ 318 if (val == -1) 319 val = 0; 320 np->tclass = val; 321 retv = 0; 322 break; 323 324 case IPV6_RECVTCLASS: 325 if (optlen < sizeof(int)) 326 goto e_inval; 327 np->rxopt.bits.rxtclass = valbool; 328 retv = 0; 329 break; 330 331 case IPV6_FLOWINFO: 332 if (optlen < sizeof(int)) 333 goto e_inval; 334 np->rxopt.bits.rxflow = valbool; 335 retv = 0; 336 break; 337 338 case IPV6_RECVPATHMTU: 339 if (optlen < sizeof(int)) 340 goto e_inval; 341 np->rxopt.bits.rxpmtu = valbool; 342 retv = 0; 343 break; 344 345 case IPV6_TRANSPARENT: 346 if (valbool && !capable(CAP_NET_ADMIN) && !capable(CAP_NET_RAW)) { 347 retv = -EPERM; 348 break; 349 } 350 if (optlen < sizeof(int)) 351 goto e_inval; 352 /* we don't have a separate transparent bit for IPV6 we use the one in the IPv4 socket */ 353 inet_sk(sk)->transparent = valbool; 354 retv = 0; 355 break; 356 357 case IPV6_RECVORIGDSTADDR: 358 if (optlen < sizeof(int)) 359 goto e_inval; 360 np->rxopt.bits.rxorigdstaddr = valbool; 361 retv = 0; 362 break; 363 364 case IPV6_HOPOPTS: 365 case IPV6_RTHDRDSTOPTS: 366 case IPV6_RTHDR: 367 case IPV6_DSTOPTS: 368 { 369 struct ipv6_txoptions *opt; 370 371 /* remove any sticky options header with a zero option 372 * length, per RFC3542. 373 */ 374 if (optlen == 0) 375 optval = NULL; 376 else if (optval == NULL) 377 goto e_inval; 378 else if (optlen < sizeof(struct ipv6_opt_hdr) || 379 optlen & 0x7 || optlen > 8 * 255) 380 goto e_inval; 381 382 /* hop-by-hop / destination options are privileged option */ 383 retv = -EPERM; 384 if (optname != IPV6_RTHDR && !capable(CAP_NET_RAW)) 385 break; 386 387 opt = ipv6_renew_options(sk, np->opt, optname, 388 (struct ipv6_opt_hdr __user *)optval, 389 optlen); 390 if (IS_ERR(opt)) { 391 retv = PTR_ERR(opt); 392 break; 393 } 394 395 /* routing header option needs extra check */ 396 retv = -EINVAL; 397 if (optname == IPV6_RTHDR && opt && opt->srcrt) { 398 struct ipv6_rt_hdr *rthdr = opt->srcrt; 399 switch (rthdr->type) { 400#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 401 case IPV6_SRCRT_TYPE_2: 402 if (rthdr->hdrlen != 2 || 403 rthdr->segments_left != 1) 404 goto sticky_done; 405 406 break; 407#endif 408 default: 409 goto sticky_done; 410 } 411 } 412 413 retv = 0; 414 opt = ipv6_update_options(sk, opt); 415sticky_done: 416 if (opt) 417 sock_kfree_s(sk, opt, opt->tot_len); 418 break; 419 } 420 421 case IPV6_PKTINFO: 422 { 423 struct in6_pktinfo pkt; 424 425 if (optlen == 0) 426 goto e_inval; 427 else if (optlen < sizeof(struct in6_pktinfo) || optval == NULL) 428 goto e_inval; 429 430 if (copy_from_user(&pkt, optval, sizeof(struct in6_pktinfo))) { 431 retv = -EFAULT; 432 break; 433 } 434 if (sk->sk_bound_dev_if && pkt.ipi6_ifindex != sk->sk_bound_dev_if) 435 goto e_inval; 436 437 np->sticky_pktinfo.ipi6_ifindex = pkt.ipi6_ifindex; 438 ipv6_addr_copy(&np->sticky_pktinfo.ipi6_addr, &pkt.ipi6_addr); 439 retv = 0; 440 break; 441 } 442 443 case IPV6_2292PKTOPTIONS: 444 { 445 struct ipv6_txoptions *opt = NULL; 446 struct msghdr msg; 447 struct flowi6 fl6; 448 int junk; 449 450 memset(&fl6, 0, sizeof(fl6)); 451 fl6.flowi6_oif = sk->sk_bound_dev_if; 452 fl6.flowi6_mark = sk->sk_mark; 453 454 if (optlen == 0) 455 goto update; 456 457 /* 1K is probably excessive 458 * 1K is surely not enough, 2K per standard header is 16K. 459 */ 460 retv = -EINVAL; 461 if (optlen > 64*1024) 462 break; 463 464 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL); 465 retv = -ENOBUFS; 466 if (opt == NULL) 467 break; 468 469 memset(opt, 0, sizeof(*opt)); 470 opt->tot_len = sizeof(*opt) + optlen; 471 retv = -EFAULT; 472 if (copy_from_user(opt+1, optval, optlen)) 473 goto done; 474 475 msg.msg_controllen = optlen; 476 msg.msg_control = (void*)(opt+1); 477 478 retv = datagram_send_ctl(net, sk, &msg, &fl6, opt, &junk, &junk, 479 &junk); 480 if (retv) 481 goto done; 482update: 483 retv = 0; 484 opt = ipv6_update_options(sk, opt); 485done: 486 if (opt) 487 sock_kfree_s(sk, opt, opt->tot_len); 488 break; 489 } 490 case IPV6_UNICAST_HOPS: 491 if (optlen < sizeof(int)) 492 goto e_inval; 493 if (val > 255 || val < -1) 494 goto e_inval; 495 np->hop_limit = val; 496 retv = 0; 497 break; 498 499 case IPV6_MULTICAST_HOPS: 500 if (sk->sk_type == SOCK_STREAM) 501 break; 502 if (optlen < sizeof(int)) 503 goto e_inval; 504 if (val > 255 || val < -1) 505 goto e_inval; 506 np->mcast_hops = (val == -1 ? IPV6_DEFAULT_MCASTHOPS : val); 507 retv = 0; 508 break; 509 510 case IPV6_MULTICAST_LOOP: 511 if (optlen < sizeof(int)) 512 goto e_inval; 513 if (val != valbool) 514 goto e_inval; 515 np->mc_loop = valbool; 516 retv = 0; 517 break; 518 519 case IPV6_MULTICAST_IF: 520 if (sk->sk_type == SOCK_STREAM) 521 break; 522 if (optlen < sizeof(int)) 523 goto e_inval; 524 525 if (val) { 526 struct net_device *dev; 527 528 if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != val) 529 goto e_inval; 530 531 dev = dev_get_by_index(net, val); 532 if (!dev) { 533 retv = -ENODEV; 534 break; 535 } 536 dev_put(dev); 537 } 538 np->mcast_oif = val; 539 retv = 0; 540 break; 541 case IPV6_ADD_MEMBERSHIP: 542 case IPV6_DROP_MEMBERSHIP: 543 { 544 struct ipv6_mreq mreq; 545 546 if (optlen < sizeof(struct ipv6_mreq)) 547 goto e_inval; 548 549 retv = -EPROTO; 550 if (inet_sk(sk)->is_icsk) 551 break; 552 553 retv = -EFAULT; 554 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq))) 555 break; 556 557 if (optname == IPV6_ADD_MEMBERSHIP) 558 retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr); 559 else 560 retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr); 561 break; 562 } 563 case IPV6_JOIN_ANYCAST: 564 case IPV6_LEAVE_ANYCAST: 565 { 566 struct ipv6_mreq mreq; 567 568 if (optlen < sizeof(struct ipv6_mreq)) 569 goto e_inval; 570 571 retv = -EFAULT; 572 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq))) 573 break; 574 575 if (optname == IPV6_JOIN_ANYCAST) 576 retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr); 577 else 578 retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr); 579 break; 580 } 581 case MCAST_JOIN_GROUP: 582 case MCAST_LEAVE_GROUP: 583 { 584 struct group_req greq; 585 struct sockaddr_in6 *psin6; 586 587 if (optlen < sizeof(struct group_req)) 588 goto e_inval; 589 590 retv = -EFAULT; 591 if (copy_from_user(&greq, optval, sizeof(struct group_req))) 592 break; 593 if (greq.gr_group.ss_family != AF_INET6) { 594 retv = -EADDRNOTAVAIL; 595 break; 596 } 597 psin6 = (struct sockaddr_in6 *)&greq.gr_group; 598 if (optname == MCAST_JOIN_GROUP) 599 retv = ipv6_sock_mc_join(sk, greq.gr_interface, 600 &psin6->sin6_addr); 601 else 602 retv = ipv6_sock_mc_drop(sk, greq.gr_interface, 603 &psin6->sin6_addr); 604 break; 605 } 606 case MCAST_JOIN_SOURCE_GROUP: 607 case MCAST_LEAVE_SOURCE_GROUP: 608 case MCAST_BLOCK_SOURCE: 609 case MCAST_UNBLOCK_SOURCE: 610 { 611 struct group_source_req greqs; 612 int omode, add; 613 614 if (optlen < sizeof(struct group_source_req)) 615 goto e_inval; 616 if (copy_from_user(&greqs, optval, sizeof(greqs))) { 617 retv = -EFAULT; 618 break; 619 } 620 if (greqs.gsr_group.ss_family != AF_INET6 || 621 greqs.gsr_source.ss_family != AF_INET6) { 622 retv = -EADDRNOTAVAIL; 623 break; 624 } 625 if (optname == MCAST_BLOCK_SOURCE) { 626 omode = MCAST_EXCLUDE; 627 add = 1; 628 } else if (optname == MCAST_UNBLOCK_SOURCE) { 629 omode = MCAST_EXCLUDE; 630 add = 0; 631 } else if (optname == MCAST_JOIN_SOURCE_GROUP) { 632 struct sockaddr_in6 *psin6; 633 634 psin6 = (struct sockaddr_in6 *)&greqs.gsr_group; 635 retv = ipv6_sock_mc_join(sk, greqs.gsr_interface, 636 &psin6->sin6_addr); 637 /* prior join w/ different source is ok */ 638 if (retv && retv != -EADDRINUSE) 639 break; 640 omode = MCAST_INCLUDE; 641 add = 1; 642 } else /* MCAST_LEAVE_SOURCE_GROUP */ { 643 omode = MCAST_INCLUDE; 644 add = 0; 645 } 646 retv = ip6_mc_source(add, omode, sk, &greqs); 647 break; 648 } 649 case MCAST_MSFILTER: 650 { 651 extern int sysctl_mld_max_msf; 652 struct group_filter *gsf; 653 654 if (optlen < GROUP_FILTER_SIZE(0)) 655 goto e_inval; 656 if (optlen > sysctl_optmem_max) { 657 retv = -ENOBUFS; 658 break; 659 } 660 gsf = kmalloc(optlen,GFP_KERNEL); 661 if (!gsf) { 662 retv = -ENOBUFS; 663 break; 664 } 665 retv = -EFAULT; 666 if (copy_from_user(gsf, optval, optlen)) { 667 kfree(gsf); 668 break; 669 } 670 /* numsrc >= (4G-140)/128 overflow in 32 bits */ 671 if (gsf->gf_numsrc >= 0x1ffffffU || 672 gsf->gf_numsrc > sysctl_mld_max_msf) { 673 kfree(gsf); 674 retv = -ENOBUFS; 675 break; 676 } 677 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) { 678 kfree(gsf); 679 retv = -EINVAL; 680 break; 681 } 682 retv = ip6_mc_msfilter(sk, gsf); 683 kfree(gsf); 684 685 break; 686 } 687 case IPV6_ROUTER_ALERT: 688 if (optlen < sizeof(int)) 689 goto e_inval; 690 retv = ip6_ra_control(sk, val); 691 break; 692 case IPV6_MTU_DISCOVER: 693 if (optlen < sizeof(int)) 694 goto e_inval; 695 if (val < IP_PMTUDISC_DONT || val > IP_PMTUDISC_PROBE) 696 goto e_inval; 697 np->pmtudisc = val; 698 retv = 0; 699 break; 700 case IPV6_MTU: 701 if (optlen < sizeof(int)) 702 goto e_inval; 703 if (val && val < IPV6_MIN_MTU) 704 goto e_inval; 705 np->frag_size = val; 706 retv = 0; 707 break; 708 case IPV6_RECVERR: 709 if (optlen < sizeof(int)) 710 goto e_inval; 711 np->recverr = valbool; 712 if (!val) 713 skb_queue_purge(&sk->sk_error_queue); 714 retv = 0; 715 break; 716 case IPV6_FLOWINFO_SEND: 717 if (optlen < sizeof(int)) 718 goto e_inval; 719 np->sndflow = valbool; 720 retv = 0; 721 break; 722 case IPV6_FLOWLABEL_MGR: 723 retv = ipv6_flowlabel_opt(sk, optval, optlen); 724 break; 725 case IPV6_IPSEC_POLICY: 726 case IPV6_XFRM_POLICY: 727 retv = -EPERM; 728 if (!capable(CAP_NET_ADMIN)) 729 break; 730 retv = xfrm_user_policy(sk, optname, optval, optlen); 731 break; 732 733 case IPV6_ADDR_PREFERENCES: 734 { 735 unsigned int pref = 0; 736 unsigned int prefmask = ~0; 737 738 if (optlen < sizeof(int)) 739 goto e_inval; 740 741 retv = -EINVAL; 742 743 /* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */ 744 switch (val & (IPV6_PREFER_SRC_PUBLIC| 745 IPV6_PREFER_SRC_TMP| 746 IPV6_PREFER_SRC_PUBTMP_DEFAULT)) { 747 case IPV6_PREFER_SRC_PUBLIC: 748 pref |= IPV6_PREFER_SRC_PUBLIC; 749 break; 750 case IPV6_PREFER_SRC_TMP: 751 pref |= IPV6_PREFER_SRC_TMP; 752 break; 753 case IPV6_PREFER_SRC_PUBTMP_DEFAULT: 754 break; 755 case 0: 756 goto pref_skip_pubtmp; 757 default: 758 goto e_inval; 759 } 760 761 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC| 762 IPV6_PREFER_SRC_TMP); 763pref_skip_pubtmp: 764 765 /* check HOME/COA conflicts */ 766 switch (val & (IPV6_PREFER_SRC_HOME|IPV6_PREFER_SRC_COA)) { 767 case IPV6_PREFER_SRC_HOME: 768 break; 769 case IPV6_PREFER_SRC_COA: 770 pref |= IPV6_PREFER_SRC_COA; 771 case 0: 772 goto pref_skip_coa; 773 default: 774 goto e_inval; 775 } 776 777 prefmask &= ~IPV6_PREFER_SRC_COA; 778pref_skip_coa: 779 780 /* check CGA/NONCGA conflicts */ 781 switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) { 782 case IPV6_PREFER_SRC_CGA: 783 case IPV6_PREFER_SRC_NONCGA: 784 case 0: 785 break; 786 default: 787 goto e_inval; 788 } 789 790 np->srcprefs = (np->srcprefs & prefmask) | pref; 791 retv = 0; 792 793 break; 794 } 795 case IPV6_MINHOPCOUNT: 796 if (optlen < sizeof(int)) 797 goto e_inval; 798 if (val < 0 || val > 255) 799 goto e_inval; 800 np->min_hopcount = val; 801 break; 802 case IPV6_DONTFRAG: 803 np->dontfrag = valbool; 804 retv = 0; 805 break; 806 } 807 808 release_sock(sk); 809 810 return retv; 811 812e_inval: 813 release_sock(sk); 814 return -EINVAL; 815} 816 817int ipv6_setsockopt(struct sock *sk, int level, int optname, 818 char __user *optval, unsigned int optlen) 819{ 820 int err; 821 822 if (level == SOL_IP && sk->sk_type != SOCK_RAW) 823 return udp_prot.setsockopt(sk, level, optname, optval, optlen); 824 825 if (level != SOL_IPV6) 826 return -ENOPROTOOPT; 827 828 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen); 829#ifdef CONFIG_NETFILTER 830 /* we need to exclude all possible ENOPROTOOPTs except default case */ 831 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY && 832 optname != IPV6_XFRM_POLICY) { 833 lock_sock(sk); 834 err = nf_setsockopt(sk, PF_INET6, optname, optval, 835 optlen); 836 release_sock(sk); 837 } 838#endif 839 return err; 840} 841 842EXPORT_SYMBOL(ipv6_setsockopt); 843 844#ifdef CONFIG_COMPAT 845int compat_ipv6_setsockopt(struct sock *sk, int level, int optname, 846 char __user *optval, unsigned int optlen) 847{ 848 int err; 849 850 if (level == SOL_IP && sk->sk_type != SOCK_RAW) { 851 if (udp_prot.compat_setsockopt != NULL) 852 return udp_prot.compat_setsockopt(sk, level, optname, 853 optval, optlen); 854 return udp_prot.setsockopt(sk, level, optname, optval, optlen); 855 } 856 857 if (level != SOL_IPV6) 858 return -ENOPROTOOPT; 859 860 if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER) 861 return compat_mc_setsockopt(sk, level, optname, optval, optlen, 862 ipv6_setsockopt); 863 864 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen); 865#ifdef CONFIG_NETFILTER 866 /* we need to exclude all possible ENOPROTOOPTs except default case */ 867 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY && 868 optname != IPV6_XFRM_POLICY) { 869 lock_sock(sk); 870 err = compat_nf_setsockopt(sk, PF_INET6, optname, 871 optval, optlen); 872 release_sock(sk); 873 } 874#endif 875 return err; 876} 877 878EXPORT_SYMBOL(compat_ipv6_setsockopt); 879#endif 880 881static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt, 882 int optname, char __user *optval, int len) 883{ 884 struct ipv6_opt_hdr *hdr; 885 886 if (!opt) 887 return 0; 888 889 switch(optname) { 890 case IPV6_HOPOPTS: 891 hdr = opt->hopopt; 892 break; 893 case IPV6_RTHDRDSTOPTS: 894 hdr = opt->dst0opt; 895 break; 896 case IPV6_RTHDR: 897 hdr = (struct ipv6_opt_hdr *)opt->srcrt; 898 break; 899 case IPV6_DSTOPTS: 900 hdr = opt->dst1opt; 901 break; 902 default: 903 return -EINVAL; /* should not happen */ 904 } 905 906 if (!hdr) 907 return 0; 908 909 len = min_t(unsigned int, len, ipv6_optlen(hdr)); 910 if (copy_to_user(optval, hdr, len)) 911 return -EFAULT; 912 return len; 913} 914 915static int do_ipv6_getsockopt(struct sock *sk, int level, int optname, 916 char __user *optval, int __user *optlen, unsigned flags) 917{ 918 struct ipv6_pinfo *np = inet6_sk(sk); 919 int len; 920 int val; 921 922 if (ip6_mroute_opt(optname)) 923 return ip6_mroute_getsockopt(sk, optname, optval, optlen); 924 925 if (get_user(len, optlen)) 926 return -EFAULT; 927 switch (optname) { 928 case IPV6_ADDRFORM: 929 if (sk->sk_protocol != IPPROTO_UDP && 930 sk->sk_protocol != IPPROTO_UDPLITE && 931 sk->sk_protocol != IPPROTO_TCP) 932 return -ENOPROTOOPT; 933 if (sk->sk_state != TCP_ESTABLISHED) 934 return -ENOTCONN; 935 val = sk->sk_family; 936 break; 937 case MCAST_MSFILTER: 938 { 939 struct group_filter gsf; 940 int err; 941 942 if (len < GROUP_FILTER_SIZE(0)) 943 return -EINVAL; 944 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) 945 return -EFAULT; 946 if (gsf.gf_group.ss_family != AF_INET6) 947 return -EADDRNOTAVAIL; 948 lock_sock(sk); 949 err = ip6_mc_msfget(sk, &gsf, 950 (struct group_filter __user *)optval, optlen); 951 release_sock(sk); 952 return err; 953 } 954 955 case IPV6_2292PKTOPTIONS: 956 { 957 struct msghdr msg; 958 struct sk_buff *skb; 959 960 if (sk->sk_type != SOCK_STREAM) 961 return -ENOPROTOOPT; 962 963 msg.msg_control = optval; 964 msg.msg_controllen = len; 965 msg.msg_flags = flags; 966 967 lock_sock(sk); 968 skb = np->pktoptions; 969 if (skb) 970 atomic_inc(&skb->users); 971 release_sock(sk); 972 973 if (skb) { 974 int err = datagram_recv_ctl(sk, &msg, skb); 975 kfree_skb(skb); 976 if (err) 977 return err; 978 } else { 979 if (np->rxopt.bits.rxinfo) { 980 struct in6_pktinfo src_info; 981 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif : 982 np->sticky_pktinfo.ipi6_ifindex; 983 np->mcast_oif? ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr) : 984 ipv6_addr_copy(&src_info.ipi6_addr, &(np->sticky_pktinfo.ipi6_addr)); 985 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info); 986 } 987 if (np->rxopt.bits.rxhlim) { 988 int hlim = np->mcast_hops; 989 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim); 990 } 991 if (np->rxopt.bits.rxoinfo) { 992 struct in6_pktinfo src_info; 993 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif : 994 np->sticky_pktinfo.ipi6_ifindex; 995 np->mcast_oif? ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr) : 996 ipv6_addr_copy(&src_info.ipi6_addr, &(np->sticky_pktinfo.ipi6_addr)); 997 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info); 998 } 999 if (np->rxopt.bits.rxohlim) { 1000 int hlim = np->mcast_hops; 1001 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim); 1002 } 1003 } 1004 len -= msg.msg_controllen; 1005 return put_user(len, optlen); 1006 } 1007 case IPV6_MTU: 1008 { 1009 struct dst_entry *dst; 1010 1011 val = 0; 1012 rcu_read_lock(); 1013 dst = __sk_dst_get(sk); 1014 if (dst) 1015 val = dst_mtu(dst); 1016 rcu_read_unlock(); 1017 if (!val) 1018 return -ENOTCONN; 1019 break; 1020 } 1021 1022 case IPV6_V6ONLY: 1023 val = np->ipv6only; 1024 break; 1025 1026 case IPV6_RECVPKTINFO: 1027 val = np->rxopt.bits.rxinfo; 1028 break; 1029 1030 case IPV6_2292PKTINFO: 1031 val = np->rxopt.bits.rxoinfo; 1032 break; 1033 1034 case IPV6_RECVHOPLIMIT: 1035 val = np->rxopt.bits.rxhlim; 1036 break; 1037 1038 case IPV6_2292HOPLIMIT: 1039 val = np->rxopt.bits.rxohlim; 1040 break; 1041 1042 case IPV6_RECVRTHDR: 1043 val = np->rxopt.bits.srcrt; 1044 break; 1045 1046 case IPV6_2292RTHDR: 1047 val = np->rxopt.bits.osrcrt; 1048 break; 1049 1050 case IPV6_HOPOPTS: 1051 case IPV6_RTHDRDSTOPTS: 1052 case IPV6_RTHDR: 1053 case IPV6_DSTOPTS: 1054 { 1055 1056 lock_sock(sk); 1057 len = ipv6_getsockopt_sticky(sk, np->opt, 1058 optname, optval, len); 1059 release_sock(sk); 1060 /* check if ipv6_getsockopt_sticky() returns err code */ 1061 if (len < 0) 1062 return len; 1063 return put_user(len, optlen); 1064 } 1065 1066 case IPV6_RECVHOPOPTS: 1067 val = np->rxopt.bits.hopopts; 1068 break; 1069 1070 case IPV6_2292HOPOPTS: 1071 val = np->rxopt.bits.ohopopts; 1072 break; 1073 1074 case IPV6_RECVDSTOPTS: 1075 val = np->rxopt.bits.dstopts; 1076 break; 1077 1078 case IPV6_2292DSTOPTS: 1079 val = np->rxopt.bits.odstopts; 1080 break; 1081 1082 case IPV6_TCLASS: 1083 val = np->tclass; 1084 break; 1085 1086 case IPV6_RECVTCLASS: 1087 val = np->rxopt.bits.rxtclass; 1088 break; 1089 1090 case IPV6_FLOWINFO: 1091 val = np->rxopt.bits.rxflow; 1092 break; 1093 1094 case IPV6_RECVPATHMTU: 1095 val = np->rxopt.bits.rxpmtu; 1096 break; 1097 1098 case IPV6_PATHMTU: 1099 { 1100 struct dst_entry *dst; 1101 struct ip6_mtuinfo mtuinfo; 1102 1103 if (len < sizeof(mtuinfo)) 1104 return -EINVAL; 1105 1106 len = sizeof(mtuinfo); 1107 memset(&mtuinfo, 0, sizeof(mtuinfo)); 1108 1109 rcu_read_lock(); 1110 dst = __sk_dst_get(sk); 1111 if (dst) 1112 mtuinfo.ip6m_mtu = dst_mtu(dst); 1113 rcu_read_unlock(); 1114 if (!mtuinfo.ip6m_mtu) 1115 return -ENOTCONN; 1116 1117 if (put_user(len, optlen)) 1118 return -EFAULT; 1119 if (copy_to_user(optval, &mtuinfo, len)) 1120 return -EFAULT; 1121 1122 return 0; 1123 break; 1124 } 1125 1126 case IPV6_TRANSPARENT: 1127 val = inet_sk(sk)->transparent; 1128 break; 1129 1130 case IPV6_RECVORIGDSTADDR: 1131 val = np->rxopt.bits.rxorigdstaddr; 1132 break; 1133 1134 case IPV6_UNICAST_HOPS: 1135 case IPV6_MULTICAST_HOPS: 1136 { 1137 struct dst_entry *dst; 1138 1139 if (optname == IPV6_UNICAST_HOPS) 1140 val = np->hop_limit; 1141 else 1142 val = np->mcast_hops; 1143 1144 if (val < 0) { 1145 rcu_read_lock(); 1146 dst = __sk_dst_get(sk); 1147 if (dst) 1148 val = ip6_dst_hoplimit(dst); 1149 rcu_read_unlock(); 1150 } 1151 1152 if (val < 0) 1153 val = sock_net(sk)->ipv6.devconf_all->hop_limit; 1154 break; 1155 } 1156 1157 case IPV6_MULTICAST_LOOP: 1158 val = np->mc_loop; 1159 break; 1160 1161 case IPV6_MULTICAST_IF: 1162 val = np->mcast_oif; 1163 break; 1164 1165 case IPV6_MTU_DISCOVER: 1166 val = np->pmtudisc; 1167 break; 1168 1169 case IPV6_RECVERR: 1170 val = np->recverr; 1171 break; 1172 1173 case IPV6_FLOWINFO_SEND: 1174 val = np->sndflow; 1175 break; 1176 1177 case IPV6_ADDR_PREFERENCES: 1178 val = 0; 1179 1180 if (np->srcprefs & IPV6_PREFER_SRC_TMP) 1181 val |= IPV6_PREFER_SRC_TMP; 1182 else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC) 1183 val |= IPV6_PREFER_SRC_PUBLIC; 1184 else { 1185 /* XXX: should we return system default? */ 1186 val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT; 1187 } 1188 1189 if (np->srcprefs & IPV6_PREFER_SRC_COA) 1190 val |= IPV6_PREFER_SRC_COA; 1191 else 1192 val |= IPV6_PREFER_SRC_HOME; 1193 break; 1194 1195 case IPV6_MINHOPCOUNT: 1196 val = np->min_hopcount; 1197 break; 1198 1199 case IPV6_DONTFRAG: 1200 val = np->dontfrag; 1201 break; 1202 1203 default: 1204 return -ENOPROTOOPT; 1205 } 1206 len = min_t(unsigned int, sizeof(int), len); 1207 if(put_user(len, optlen)) 1208 return -EFAULT; 1209 if(copy_to_user(optval,&val,len)) 1210 return -EFAULT; 1211 return 0; 1212} 1213 1214int ipv6_getsockopt(struct sock *sk, int level, int optname, 1215 char __user *optval, int __user *optlen) 1216{ 1217 int err; 1218 1219 if (level == SOL_IP && sk->sk_type != SOCK_RAW) 1220 return udp_prot.getsockopt(sk, level, optname, optval, optlen); 1221 1222 if(level != SOL_IPV6) 1223 return -ENOPROTOOPT; 1224 1225 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen, 0); 1226#ifdef CONFIG_NETFILTER 1227 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1228 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) { 1229 int len; 1230 1231 if (get_user(len, optlen)) 1232 return -EFAULT; 1233 1234 lock_sock(sk); 1235 err = nf_getsockopt(sk, PF_INET6, optname, optval, 1236 &len); 1237 release_sock(sk); 1238 if (err >= 0) 1239 err = put_user(len, optlen); 1240 } 1241#endif 1242 return err; 1243} 1244 1245EXPORT_SYMBOL(ipv6_getsockopt); 1246 1247#ifdef CONFIG_COMPAT 1248int compat_ipv6_getsockopt(struct sock *sk, int level, int optname, 1249 char __user *optval, int __user *optlen) 1250{ 1251 int err; 1252 1253 if (level == SOL_IP && sk->sk_type != SOCK_RAW) { 1254 if (udp_prot.compat_getsockopt != NULL) 1255 return udp_prot.compat_getsockopt(sk, level, optname, 1256 optval, optlen); 1257 return udp_prot.getsockopt(sk, level, optname, optval, optlen); 1258 } 1259 1260 if (level != SOL_IPV6) 1261 return -ENOPROTOOPT; 1262 1263 if (optname == MCAST_MSFILTER) 1264 return compat_mc_getsockopt(sk, level, optname, optval, optlen, 1265 ipv6_getsockopt); 1266 1267 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen, 1268 MSG_CMSG_COMPAT); 1269#ifdef CONFIG_NETFILTER 1270 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1271 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) { 1272 int len; 1273 1274 if (get_user(len, optlen)) 1275 return -EFAULT; 1276 1277 lock_sock(sk); 1278 err = compat_nf_getsockopt(sk, PF_INET6, 1279 optname, optval, &len); 1280 release_sock(sk); 1281 if (err >= 0) 1282 err = put_user(len, optlen); 1283 } 1284#endif 1285 return err; 1286} 1287 1288EXPORT_SYMBOL(compat_ipv6_getsockopt); 1289#endif 1290 1291