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 #include <net/seg6.h> 56 57 #include <linux/uaccess.h> 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) { 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 struct 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 } 114 opt = xchg((__force struct ipv6_txoptions **)&inet6_sk(sk)->opt, 115 opt); 116 sk_dst_reset(sk); 117 118 return opt; 119 } 120 121 static bool setsockopt_needs_rtnl(int optname) 122 { 123 switch (optname) { 124 case IPV6_ADDRFORM: 125 case IPV6_ADD_MEMBERSHIP: 126 case IPV6_DROP_MEMBERSHIP: 127 case IPV6_JOIN_ANYCAST: 128 case IPV6_LEAVE_ANYCAST: 129 case MCAST_JOIN_GROUP: 130 case MCAST_LEAVE_GROUP: 131 case MCAST_JOIN_SOURCE_GROUP: 132 case MCAST_LEAVE_SOURCE_GROUP: 133 case MCAST_BLOCK_SOURCE: 134 case MCAST_UNBLOCK_SOURCE: 135 case MCAST_MSFILTER: 136 return true; 137 } 138 return false; 139 } 140 141 static int do_ipv6_setsockopt(struct sock *sk, int level, int optname, 142 char __user *optval, unsigned int optlen) 143 { 144 struct ipv6_pinfo *np = inet6_sk(sk); 145 struct net *net = sock_net(sk); 146 int val, valbool; 147 int retv = -ENOPROTOOPT; 148 bool needs_rtnl = setsockopt_needs_rtnl(optname); 149 150 if (!optval) 151 val = 0; 152 else { 153 if (optlen >= sizeof(int)) { 154 if (get_user(val, (int __user *) optval)) 155 return -EFAULT; 156 } else 157 val = 0; 158 } 159 160 valbool = (val != 0); 161 162 if (ip6_mroute_opt(optname)) 163 return ip6_mroute_setsockopt(sk, optname, optval, optlen); 164 165 if (needs_rtnl) 166 rtnl_lock(); 167 lock_sock(sk); 168 169 switch (optname) { 170 171 case IPV6_ADDRFORM: 172 if (optlen < sizeof(int)) 173 goto e_inval; 174 if (val == PF_INET) { 175 struct ipv6_txoptions *opt; 176 struct sk_buff *pktopt; 177 178 if (sk->sk_type == SOCK_RAW) 179 break; 180 181 if (sk->sk_protocol == IPPROTO_UDP || 182 sk->sk_protocol == IPPROTO_UDPLITE) { 183 struct udp_sock *up = udp_sk(sk); 184 if (up->pending == AF_INET6) { 185 retv = -EBUSY; 186 break; 187 } 188 } else if (sk->sk_protocol != IPPROTO_TCP) 189 break; 190 191 if (sk->sk_state != TCP_ESTABLISHED) { 192 retv = -ENOTCONN; 193 break; 194 } 195 196 if (ipv6_only_sock(sk) || 197 !ipv6_addr_v4mapped(&sk->sk_v6_daddr)) { 198 retv = -EADDRNOTAVAIL; 199 break; 200 } 201 202 fl6_free_socklist(sk); 203 __ipv6_sock_mc_close(sk); 204 205 /* 206 * Sock is moving from IPv6 to IPv4 (sk_prot), so 207 * remove it from the refcnt debug socks count in the 208 * original family... 209 */ 210 sk_refcnt_debug_dec(sk); 211 212 if (sk->sk_protocol == IPPROTO_TCP) { 213 struct inet_connection_sock *icsk = inet_csk(sk); 214 local_bh_disable(); 215 sock_prot_inuse_add(net, sk->sk_prot, -1); 216 sock_prot_inuse_add(net, &tcp_prot, 1); 217 local_bh_enable(); 218 sk->sk_prot = &tcp_prot; 219 icsk->icsk_af_ops = &ipv4_specific; 220 sk->sk_socket->ops = &inet_stream_ops; 221 sk->sk_family = PF_INET; 222 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie); 223 } else { 224 struct proto *prot = &udp_prot; 225 226 if (sk->sk_protocol == IPPROTO_UDPLITE) 227 prot = &udplite_prot; 228 local_bh_disable(); 229 sock_prot_inuse_add(net, sk->sk_prot, -1); 230 sock_prot_inuse_add(net, prot, 1); 231 local_bh_enable(); 232 sk->sk_prot = prot; 233 sk->sk_socket->ops = &inet_dgram_ops; 234 sk->sk_family = PF_INET; 235 } 236 opt = xchg((__force struct ipv6_txoptions **)&np->opt, 237 NULL); 238 if (opt) { 239 atomic_sub(opt->tot_len, &sk->sk_omem_alloc); 240 txopt_put(opt); 241 } 242 pktopt = xchg(&np->pktoptions, NULL); 243 kfree_skb(pktopt); 244 245 /* 246 * ... and add it to the refcnt debug socks count 247 * in the new family. -acme 248 */ 249 sk_refcnt_debug_inc(sk); 250 module_put(THIS_MODULE); 251 retv = 0; 252 break; 253 } 254 goto e_inval; 255 256 case IPV6_V6ONLY: 257 if (optlen < sizeof(int) || 258 inet_sk(sk)->inet_num) 259 goto e_inval; 260 sk->sk_ipv6only = valbool; 261 retv = 0; 262 break; 263 264 case IPV6_RECVPKTINFO: 265 if (optlen < sizeof(int)) 266 goto e_inval; 267 np->rxopt.bits.rxinfo = valbool; 268 retv = 0; 269 break; 270 271 case IPV6_2292PKTINFO: 272 if (optlen < sizeof(int)) 273 goto e_inval; 274 np->rxopt.bits.rxoinfo = valbool; 275 retv = 0; 276 break; 277 278 case IPV6_RECVHOPLIMIT: 279 if (optlen < sizeof(int)) 280 goto e_inval; 281 np->rxopt.bits.rxhlim = valbool; 282 retv = 0; 283 break; 284 285 case IPV6_2292HOPLIMIT: 286 if (optlen < sizeof(int)) 287 goto e_inval; 288 np->rxopt.bits.rxohlim = valbool; 289 retv = 0; 290 break; 291 292 case IPV6_RECVRTHDR: 293 if (optlen < sizeof(int)) 294 goto e_inval; 295 np->rxopt.bits.srcrt = valbool; 296 retv = 0; 297 break; 298 299 case IPV6_2292RTHDR: 300 if (optlen < sizeof(int)) 301 goto e_inval; 302 np->rxopt.bits.osrcrt = valbool; 303 retv = 0; 304 break; 305 306 case IPV6_RECVHOPOPTS: 307 if (optlen < sizeof(int)) 308 goto e_inval; 309 np->rxopt.bits.hopopts = valbool; 310 retv = 0; 311 break; 312 313 case IPV6_2292HOPOPTS: 314 if (optlen < sizeof(int)) 315 goto e_inval; 316 np->rxopt.bits.ohopopts = valbool; 317 retv = 0; 318 break; 319 320 case IPV6_RECVDSTOPTS: 321 if (optlen < sizeof(int)) 322 goto e_inval; 323 np->rxopt.bits.dstopts = valbool; 324 retv = 0; 325 break; 326 327 case IPV6_2292DSTOPTS: 328 if (optlen < sizeof(int)) 329 goto e_inval; 330 np->rxopt.bits.odstopts = valbool; 331 retv = 0; 332 break; 333 334 case IPV6_TCLASS: 335 if (optlen < sizeof(int)) 336 goto e_inval; 337 if (val < -1 || val > 0xff) 338 goto e_inval; 339 /* RFC 3542, 6.5: default traffic class of 0x0 */ 340 if (val == -1) 341 val = 0; 342 np->tclass = val; 343 retv = 0; 344 break; 345 346 case IPV6_RECVTCLASS: 347 if (optlen < sizeof(int)) 348 goto e_inval; 349 np->rxopt.bits.rxtclass = valbool; 350 retv = 0; 351 break; 352 353 case IPV6_FLOWINFO: 354 if (optlen < sizeof(int)) 355 goto e_inval; 356 np->rxopt.bits.rxflow = valbool; 357 retv = 0; 358 break; 359 360 case IPV6_RECVPATHMTU: 361 if (optlen < sizeof(int)) 362 goto e_inval; 363 np->rxopt.bits.rxpmtu = valbool; 364 retv = 0; 365 break; 366 367 case IPV6_TRANSPARENT: 368 if (valbool && !ns_capable(net->user_ns, CAP_NET_ADMIN) && 369 !ns_capable(net->user_ns, CAP_NET_RAW)) { 370 retv = -EPERM; 371 break; 372 } 373 if (optlen < sizeof(int)) 374 goto e_inval; 375 /* we don't have a separate transparent bit for IPV6 we use the one in the IPv4 socket */ 376 inet_sk(sk)->transparent = valbool; 377 retv = 0; 378 break; 379 380 case IPV6_FREEBIND: 381 if (optlen < sizeof(int)) 382 goto e_inval; 383 /* we also don't have a separate freebind bit for IPV6 */ 384 inet_sk(sk)->freebind = valbool; 385 retv = 0; 386 break; 387 388 case IPV6_RECVORIGDSTADDR: 389 if (optlen < sizeof(int)) 390 goto e_inval; 391 np->rxopt.bits.rxorigdstaddr = valbool; 392 retv = 0; 393 break; 394 395 case IPV6_HOPOPTS: 396 case IPV6_RTHDRDSTOPTS: 397 case IPV6_RTHDR: 398 case IPV6_DSTOPTS: 399 { 400 struct ipv6_txoptions *opt; 401 struct ipv6_opt_hdr *new = NULL; 402 403 /* hop-by-hop / destination options are privileged option */ 404 retv = -EPERM; 405 if (optname != IPV6_RTHDR && !ns_capable(net->user_ns, CAP_NET_RAW)) 406 break; 407 408 /* remove any sticky options header with a zero option 409 * length, per RFC3542. 410 */ 411 if (optlen == 0) 412 optval = NULL; 413 else if (!optval) 414 goto e_inval; 415 else if (optlen < sizeof(struct ipv6_opt_hdr) || 416 optlen & 0x7 || optlen > 8 * 255) 417 goto e_inval; 418 else { 419 new = memdup_user(optval, optlen); 420 if (IS_ERR(new)) { 421 retv = PTR_ERR(new); 422 break; 423 } 424 if (unlikely(ipv6_optlen(new) > optlen)) { 425 kfree(new); 426 goto e_inval; 427 } 428 } 429 430 opt = rcu_dereference_protected(np->opt, 431 lockdep_sock_is_held(sk)); 432 opt = ipv6_renew_options(sk, opt, optname, new); 433 kfree(new); 434 if (IS_ERR(opt)) { 435 retv = PTR_ERR(opt); 436 break; 437 } 438 439 /* routing header option needs extra check */ 440 retv = -EINVAL; 441 if (optname == IPV6_RTHDR && opt && opt->srcrt) { 442 struct ipv6_rt_hdr *rthdr = opt->srcrt; 443 switch (rthdr->type) { 444 #if IS_ENABLED(CONFIG_IPV6_MIP6) 445 case IPV6_SRCRT_TYPE_2: 446 if (rthdr->hdrlen != 2 || 447 rthdr->segments_left != 1) 448 goto sticky_done; 449 450 break; 451 #endif 452 case IPV6_SRCRT_TYPE_4: 453 { 454 struct ipv6_sr_hdr *srh = (struct ipv6_sr_hdr *) 455 opt->srcrt; 456 457 if (!seg6_validate_srh(srh, optlen)) 458 goto sticky_done; 459 break; 460 } 461 default: 462 goto sticky_done; 463 } 464 } 465 466 retv = 0; 467 opt = ipv6_update_options(sk, opt); 468 sticky_done: 469 if (opt) { 470 atomic_sub(opt->tot_len, &sk->sk_omem_alloc); 471 txopt_put(opt); 472 } 473 break; 474 } 475 476 case IPV6_PKTINFO: 477 { 478 struct in6_pktinfo pkt; 479 480 if (optlen == 0) 481 goto e_inval; 482 else if (optlen < sizeof(struct in6_pktinfo) || !optval) 483 goto e_inval; 484 485 if (copy_from_user(&pkt, optval, sizeof(struct in6_pktinfo))) { 486 retv = -EFAULT; 487 break; 488 } 489 if (sk->sk_bound_dev_if && pkt.ipi6_ifindex != sk->sk_bound_dev_if) 490 goto e_inval; 491 492 np->sticky_pktinfo.ipi6_ifindex = pkt.ipi6_ifindex; 493 np->sticky_pktinfo.ipi6_addr = pkt.ipi6_addr; 494 retv = 0; 495 break; 496 } 497 498 case IPV6_2292PKTOPTIONS: 499 { 500 struct ipv6_txoptions *opt = NULL; 501 struct msghdr msg; 502 struct flowi6 fl6; 503 struct ipcm6_cookie ipc6; 504 505 memset(&fl6, 0, sizeof(fl6)); 506 fl6.flowi6_oif = sk->sk_bound_dev_if; 507 fl6.flowi6_mark = sk->sk_mark; 508 509 if (optlen == 0) 510 goto update; 511 512 /* 1K is probably excessive 513 * 1K is surely not enough, 2K per standard header is 16K. 514 */ 515 retv = -EINVAL; 516 if (optlen > 64*1024) 517 break; 518 519 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL); 520 retv = -ENOBUFS; 521 if (!opt) 522 break; 523 524 memset(opt, 0, sizeof(*opt)); 525 refcount_set(&opt->refcnt, 1); 526 opt->tot_len = sizeof(*opt) + optlen; 527 retv = -EFAULT; 528 if (copy_from_user(opt+1, optval, optlen)) 529 goto done; 530 531 msg.msg_controllen = optlen; 532 msg.msg_control = (void *)(opt+1); 533 ipc6.opt = opt; 534 535 retv = ip6_datagram_send_ctl(net, sk, &msg, &fl6, &ipc6); 536 if (retv) 537 goto done; 538 update: 539 retv = 0; 540 opt = ipv6_update_options(sk, opt); 541 done: 542 if (opt) { 543 atomic_sub(opt->tot_len, &sk->sk_omem_alloc); 544 txopt_put(opt); 545 } 546 break; 547 } 548 case IPV6_UNICAST_HOPS: 549 if (optlen < sizeof(int)) 550 goto e_inval; 551 if (val > 255 || val < -1) 552 goto e_inval; 553 np->hop_limit = val; 554 retv = 0; 555 break; 556 557 case IPV6_MULTICAST_HOPS: 558 if (sk->sk_type == SOCK_STREAM) 559 break; 560 if (optlen < sizeof(int)) 561 goto e_inval; 562 if (val > 255 || val < -1) 563 goto e_inval; 564 np->mcast_hops = (val == -1 ? IPV6_DEFAULT_MCASTHOPS : val); 565 retv = 0; 566 break; 567 568 case IPV6_MULTICAST_LOOP: 569 if (optlen < sizeof(int)) 570 goto e_inval; 571 if (val != valbool) 572 goto e_inval; 573 np->mc_loop = valbool; 574 retv = 0; 575 break; 576 577 case IPV6_UNICAST_IF: 578 { 579 struct net_device *dev = NULL; 580 int ifindex; 581 582 if (optlen != sizeof(int)) 583 goto e_inval; 584 585 ifindex = (__force int)ntohl((__force __be32)val); 586 if (ifindex == 0) { 587 np->ucast_oif = 0; 588 retv = 0; 589 break; 590 } 591 592 dev = dev_get_by_index(net, ifindex); 593 retv = -EADDRNOTAVAIL; 594 if (!dev) 595 break; 596 dev_put(dev); 597 598 retv = -EINVAL; 599 if (sk->sk_bound_dev_if) 600 break; 601 602 np->ucast_oif = ifindex; 603 retv = 0; 604 break; 605 } 606 607 case IPV6_MULTICAST_IF: 608 if (sk->sk_type == SOCK_STREAM) 609 break; 610 if (optlen < sizeof(int)) 611 goto e_inval; 612 613 if (val) { 614 struct net_device *dev; 615 int midx; 616 617 rcu_read_lock(); 618 619 dev = dev_get_by_index_rcu(net, val); 620 if (!dev) { 621 rcu_read_unlock(); 622 retv = -ENODEV; 623 break; 624 } 625 midx = l3mdev_master_ifindex_rcu(dev); 626 627 rcu_read_unlock(); 628 629 if (sk->sk_bound_dev_if && 630 sk->sk_bound_dev_if != val && 631 (!midx || midx != sk->sk_bound_dev_if)) 632 goto e_inval; 633 } 634 np->mcast_oif = val; 635 retv = 0; 636 break; 637 case IPV6_ADD_MEMBERSHIP: 638 case IPV6_DROP_MEMBERSHIP: 639 { 640 struct ipv6_mreq mreq; 641 642 if (optlen < sizeof(struct ipv6_mreq)) 643 goto e_inval; 644 645 retv = -EPROTO; 646 if (inet_sk(sk)->is_icsk) 647 break; 648 649 retv = -EFAULT; 650 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq))) 651 break; 652 653 if (optname == IPV6_ADD_MEMBERSHIP) 654 retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr); 655 else 656 retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr); 657 break; 658 } 659 case IPV6_JOIN_ANYCAST: 660 case IPV6_LEAVE_ANYCAST: 661 { 662 struct ipv6_mreq mreq; 663 664 if (optlen < sizeof(struct ipv6_mreq)) 665 goto e_inval; 666 667 retv = -EFAULT; 668 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq))) 669 break; 670 671 if (optname == IPV6_JOIN_ANYCAST) 672 retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr); 673 else 674 retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr); 675 break; 676 } 677 case MCAST_JOIN_GROUP: 678 case MCAST_LEAVE_GROUP: 679 { 680 struct group_req greq; 681 struct sockaddr_in6 *psin6; 682 683 if (optlen < sizeof(struct group_req)) 684 goto e_inval; 685 686 retv = -EFAULT; 687 if (copy_from_user(&greq, optval, sizeof(struct group_req))) 688 break; 689 if (greq.gr_group.ss_family != AF_INET6) { 690 retv = -EADDRNOTAVAIL; 691 break; 692 } 693 psin6 = (struct sockaddr_in6 *)&greq.gr_group; 694 if (optname == MCAST_JOIN_GROUP) 695 retv = ipv6_sock_mc_join(sk, greq.gr_interface, 696 &psin6->sin6_addr); 697 else 698 retv = ipv6_sock_mc_drop(sk, greq.gr_interface, 699 &psin6->sin6_addr); 700 break; 701 } 702 case MCAST_JOIN_SOURCE_GROUP: 703 case MCAST_LEAVE_SOURCE_GROUP: 704 case MCAST_BLOCK_SOURCE: 705 case MCAST_UNBLOCK_SOURCE: 706 { 707 struct group_source_req greqs; 708 int omode, add; 709 710 if (optlen < sizeof(struct group_source_req)) 711 goto e_inval; 712 if (copy_from_user(&greqs, optval, sizeof(greqs))) { 713 retv = -EFAULT; 714 break; 715 } 716 if (greqs.gsr_group.ss_family != AF_INET6 || 717 greqs.gsr_source.ss_family != AF_INET6) { 718 retv = -EADDRNOTAVAIL; 719 break; 720 } 721 if (optname == MCAST_BLOCK_SOURCE) { 722 omode = MCAST_EXCLUDE; 723 add = 1; 724 } else if (optname == MCAST_UNBLOCK_SOURCE) { 725 omode = MCAST_EXCLUDE; 726 add = 0; 727 } else if (optname == MCAST_JOIN_SOURCE_GROUP) { 728 struct sockaddr_in6 *psin6; 729 730 psin6 = (struct sockaddr_in6 *)&greqs.gsr_group; 731 retv = ipv6_sock_mc_join_ssm(sk, greqs.gsr_interface, 732 &psin6->sin6_addr, 733 MCAST_INCLUDE); 734 /* prior join w/ different source is ok */ 735 if (retv && retv != -EADDRINUSE) 736 break; 737 omode = MCAST_INCLUDE; 738 add = 1; 739 } else /* MCAST_LEAVE_SOURCE_GROUP */ { 740 omode = MCAST_INCLUDE; 741 add = 0; 742 } 743 retv = ip6_mc_source(add, omode, sk, &greqs); 744 break; 745 } 746 case MCAST_MSFILTER: 747 { 748 struct group_filter *gsf; 749 750 if (optlen < GROUP_FILTER_SIZE(0)) 751 goto e_inval; 752 if (optlen > sysctl_optmem_max) { 753 retv = -ENOBUFS; 754 break; 755 } 756 gsf = memdup_user(optval, optlen); 757 if (IS_ERR(gsf)) { 758 retv = PTR_ERR(gsf); 759 break; 760 } 761 /* numsrc >= (4G-140)/128 overflow in 32 bits */ 762 if (gsf->gf_numsrc >= 0x1ffffffU || 763 gsf->gf_numsrc > sysctl_mld_max_msf) { 764 kfree(gsf); 765 retv = -ENOBUFS; 766 break; 767 } 768 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) { 769 kfree(gsf); 770 retv = -EINVAL; 771 break; 772 } 773 retv = ip6_mc_msfilter(sk, gsf); 774 kfree(gsf); 775 776 break; 777 } 778 case IPV6_ROUTER_ALERT: 779 if (optlen < sizeof(int)) 780 goto e_inval; 781 retv = ip6_ra_control(sk, val); 782 break; 783 case IPV6_MTU_DISCOVER: 784 if (optlen < sizeof(int)) 785 goto e_inval; 786 if (val < IPV6_PMTUDISC_DONT || val > IPV6_PMTUDISC_OMIT) 787 goto e_inval; 788 np->pmtudisc = val; 789 retv = 0; 790 break; 791 case IPV6_MTU: 792 if (optlen < sizeof(int)) 793 goto e_inval; 794 if (val && val < IPV6_MIN_MTU) 795 goto e_inval; 796 np->frag_size = val; 797 retv = 0; 798 break; 799 case IPV6_RECVERR: 800 if (optlen < sizeof(int)) 801 goto e_inval; 802 np->recverr = valbool; 803 if (!val) 804 skb_queue_purge(&sk->sk_error_queue); 805 retv = 0; 806 break; 807 case IPV6_FLOWINFO_SEND: 808 if (optlen < sizeof(int)) 809 goto e_inval; 810 np->sndflow = valbool; 811 retv = 0; 812 break; 813 case IPV6_FLOWLABEL_MGR: 814 retv = ipv6_flowlabel_opt(sk, optval, optlen); 815 break; 816 case IPV6_IPSEC_POLICY: 817 case IPV6_XFRM_POLICY: 818 retv = -EPERM; 819 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 820 break; 821 retv = xfrm_user_policy(sk, optname, optval, optlen); 822 break; 823 824 case IPV6_ADDR_PREFERENCES: 825 { 826 unsigned int pref = 0; 827 unsigned int prefmask = ~0; 828 829 if (optlen < sizeof(int)) 830 goto e_inval; 831 832 retv = -EINVAL; 833 834 /* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */ 835 switch (val & (IPV6_PREFER_SRC_PUBLIC| 836 IPV6_PREFER_SRC_TMP| 837 IPV6_PREFER_SRC_PUBTMP_DEFAULT)) { 838 case IPV6_PREFER_SRC_PUBLIC: 839 pref |= IPV6_PREFER_SRC_PUBLIC; 840 break; 841 case IPV6_PREFER_SRC_TMP: 842 pref |= IPV6_PREFER_SRC_TMP; 843 break; 844 case IPV6_PREFER_SRC_PUBTMP_DEFAULT: 845 break; 846 case 0: 847 goto pref_skip_pubtmp; 848 default: 849 goto e_inval; 850 } 851 852 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC| 853 IPV6_PREFER_SRC_TMP); 854 pref_skip_pubtmp: 855 856 /* check HOME/COA conflicts */ 857 switch (val & (IPV6_PREFER_SRC_HOME|IPV6_PREFER_SRC_COA)) { 858 case IPV6_PREFER_SRC_HOME: 859 break; 860 case IPV6_PREFER_SRC_COA: 861 pref |= IPV6_PREFER_SRC_COA; 862 case 0: 863 goto pref_skip_coa; 864 default: 865 goto e_inval; 866 } 867 868 prefmask &= ~IPV6_PREFER_SRC_COA; 869 pref_skip_coa: 870 871 /* check CGA/NONCGA conflicts */ 872 switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) { 873 case IPV6_PREFER_SRC_CGA: 874 case IPV6_PREFER_SRC_NONCGA: 875 case 0: 876 break; 877 default: 878 goto e_inval; 879 } 880 881 np->srcprefs = (np->srcprefs & prefmask) | pref; 882 retv = 0; 883 884 break; 885 } 886 case IPV6_MINHOPCOUNT: 887 if (optlen < sizeof(int)) 888 goto e_inval; 889 if (val < 0 || val > 255) 890 goto e_inval; 891 np->min_hopcount = val; 892 retv = 0; 893 break; 894 case IPV6_DONTFRAG: 895 np->dontfrag = valbool; 896 retv = 0; 897 break; 898 case IPV6_AUTOFLOWLABEL: 899 np->autoflowlabel = valbool; 900 np->autoflowlabel_set = 1; 901 retv = 0; 902 break; 903 case IPV6_RECVFRAGSIZE: 904 np->rxopt.bits.recvfragsize = valbool; 905 retv = 0; 906 break; 907 } 908 909 release_sock(sk); 910 if (needs_rtnl) 911 rtnl_unlock(); 912 913 return retv; 914 915 e_inval: 916 release_sock(sk); 917 if (needs_rtnl) 918 rtnl_unlock(); 919 return -EINVAL; 920 } 921 922 int ipv6_setsockopt(struct sock *sk, int level, int optname, 923 char __user *optval, unsigned int optlen) 924 { 925 int err; 926 927 if (level == SOL_IP && sk->sk_type != SOCK_RAW) 928 return udp_prot.setsockopt(sk, level, optname, optval, optlen); 929 930 if (level != SOL_IPV6) 931 return -ENOPROTOOPT; 932 933 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen); 934 #ifdef CONFIG_NETFILTER 935 /* we need to exclude all possible ENOPROTOOPTs except default case */ 936 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY && 937 optname != IPV6_XFRM_POLICY) 938 err = nf_setsockopt(sk, PF_INET6, optname, optval, optlen); 939 #endif 940 return err; 941 } 942 EXPORT_SYMBOL(ipv6_setsockopt); 943 944 #ifdef CONFIG_COMPAT 945 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname, 946 char __user *optval, unsigned int optlen) 947 { 948 int err; 949 950 if (level == SOL_IP && sk->sk_type != SOCK_RAW) { 951 if (udp_prot.compat_setsockopt != NULL) 952 return udp_prot.compat_setsockopt(sk, level, optname, 953 optval, optlen); 954 return udp_prot.setsockopt(sk, level, optname, optval, optlen); 955 } 956 957 if (level != SOL_IPV6) 958 return -ENOPROTOOPT; 959 960 if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER) 961 return compat_mc_setsockopt(sk, level, optname, optval, optlen, 962 ipv6_setsockopt); 963 964 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen); 965 #ifdef CONFIG_NETFILTER 966 /* we need to exclude all possible ENOPROTOOPTs except default case */ 967 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY && 968 optname != IPV6_XFRM_POLICY) 969 err = compat_nf_setsockopt(sk, PF_INET6, optname, optval, 970 optlen); 971 #endif 972 return err; 973 } 974 EXPORT_SYMBOL(compat_ipv6_setsockopt); 975 #endif 976 977 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt, 978 int optname, char __user *optval, int len) 979 { 980 struct ipv6_opt_hdr *hdr; 981 982 if (!opt) 983 return 0; 984 985 switch (optname) { 986 case IPV6_HOPOPTS: 987 hdr = opt->hopopt; 988 break; 989 case IPV6_RTHDRDSTOPTS: 990 hdr = opt->dst0opt; 991 break; 992 case IPV6_RTHDR: 993 hdr = (struct ipv6_opt_hdr *)opt->srcrt; 994 break; 995 case IPV6_DSTOPTS: 996 hdr = opt->dst1opt; 997 break; 998 default: 999 return -EINVAL; /* should not happen */ 1000 } 1001 1002 if (!hdr) 1003 return 0; 1004 1005 len = min_t(unsigned int, len, ipv6_optlen(hdr)); 1006 if (copy_to_user(optval, hdr, len)) 1007 return -EFAULT; 1008 return len; 1009 } 1010 1011 static int do_ipv6_getsockopt(struct sock *sk, int level, int optname, 1012 char __user *optval, int __user *optlen, unsigned int flags) 1013 { 1014 struct ipv6_pinfo *np = inet6_sk(sk); 1015 int len; 1016 int val; 1017 1018 if (ip6_mroute_opt(optname)) 1019 return ip6_mroute_getsockopt(sk, optname, optval, optlen); 1020 1021 if (get_user(len, optlen)) 1022 return -EFAULT; 1023 switch (optname) { 1024 case IPV6_ADDRFORM: 1025 if (sk->sk_protocol != IPPROTO_UDP && 1026 sk->sk_protocol != IPPROTO_UDPLITE && 1027 sk->sk_protocol != IPPROTO_TCP) 1028 return -ENOPROTOOPT; 1029 if (sk->sk_state != TCP_ESTABLISHED) 1030 return -ENOTCONN; 1031 val = sk->sk_family; 1032 break; 1033 case MCAST_MSFILTER: 1034 { 1035 struct group_filter gsf; 1036 int err; 1037 1038 if (len < GROUP_FILTER_SIZE(0)) 1039 return -EINVAL; 1040 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) 1041 return -EFAULT; 1042 if (gsf.gf_group.ss_family != AF_INET6) 1043 return -EADDRNOTAVAIL; 1044 lock_sock(sk); 1045 err = ip6_mc_msfget(sk, &gsf, 1046 (struct group_filter __user *)optval, optlen); 1047 release_sock(sk); 1048 return err; 1049 } 1050 1051 case IPV6_2292PKTOPTIONS: 1052 { 1053 struct msghdr msg; 1054 struct sk_buff *skb; 1055 1056 if (sk->sk_type != SOCK_STREAM) 1057 return -ENOPROTOOPT; 1058 1059 msg.msg_control = optval; 1060 msg.msg_controllen = len; 1061 msg.msg_flags = flags; 1062 1063 lock_sock(sk); 1064 skb = np->pktoptions; 1065 if (skb) 1066 ip6_datagram_recv_ctl(sk, &msg, skb); 1067 release_sock(sk); 1068 if (!skb) { 1069 if (np->rxopt.bits.rxinfo) { 1070 struct in6_pktinfo src_info; 1071 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif : 1072 np->sticky_pktinfo.ipi6_ifindex; 1073 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr : np->sticky_pktinfo.ipi6_addr; 1074 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info); 1075 } 1076 if (np->rxopt.bits.rxhlim) { 1077 int hlim = np->mcast_hops; 1078 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim); 1079 } 1080 if (np->rxopt.bits.rxtclass) { 1081 int tclass = (int)ip6_tclass(np->rcv_flowinfo); 1082 1083 put_cmsg(&msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass); 1084 } 1085 if (np->rxopt.bits.rxoinfo) { 1086 struct in6_pktinfo src_info; 1087 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif : 1088 np->sticky_pktinfo.ipi6_ifindex; 1089 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr : 1090 np->sticky_pktinfo.ipi6_addr; 1091 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info); 1092 } 1093 if (np->rxopt.bits.rxohlim) { 1094 int hlim = np->mcast_hops; 1095 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim); 1096 } 1097 if (np->rxopt.bits.rxflow) { 1098 __be32 flowinfo = np->rcv_flowinfo; 1099 1100 put_cmsg(&msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo); 1101 } 1102 } 1103 len -= msg.msg_controllen; 1104 return put_user(len, optlen); 1105 } 1106 case IPV6_MTU: 1107 { 1108 struct dst_entry *dst; 1109 1110 val = 0; 1111 rcu_read_lock(); 1112 dst = __sk_dst_get(sk); 1113 if (dst) 1114 val = dst_mtu(dst); 1115 rcu_read_unlock(); 1116 if (!val) 1117 return -ENOTCONN; 1118 break; 1119 } 1120 1121 case IPV6_V6ONLY: 1122 val = sk->sk_ipv6only; 1123 break; 1124 1125 case IPV6_RECVPKTINFO: 1126 val = np->rxopt.bits.rxinfo; 1127 break; 1128 1129 case IPV6_2292PKTINFO: 1130 val = np->rxopt.bits.rxoinfo; 1131 break; 1132 1133 case IPV6_RECVHOPLIMIT: 1134 val = np->rxopt.bits.rxhlim; 1135 break; 1136 1137 case IPV6_2292HOPLIMIT: 1138 val = np->rxopt.bits.rxohlim; 1139 break; 1140 1141 case IPV6_RECVRTHDR: 1142 val = np->rxopt.bits.srcrt; 1143 break; 1144 1145 case IPV6_2292RTHDR: 1146 val = np->rxopt.bits.osrcrt; 1147 break; 1148 1149 case IPV6_HOPOPTS: 1150 case IPV6_RTHDRDSTOPTS: 1151 case IPV6_RTHDR: 1152 case IPV6_DSTOPTS: 1153 { 1154 struct ipv6_txoptions *opt; 1155 1156 lock_sock(sk); 1157 opt = rcu_dereference_protected(np->opt, 1158 lockdep_sock_is_held(sk)); 1159 len = ipv6_getsockopt_sticky(sk, opt, optname, optval, len); 1160 release_sock(sk); 1161 /* check if ipv6_getsockopt_sticky() returns err code */ 1162 if (len < 0) 1163 return len; 1164 return put_user(len, optlen); 1165 } 1166 1167 case IPV6_RECVHOPOPTS: 1168 val = np->rxopt.bits.hopopts; 1169 break; 1170 1171 case IPV6_2292HOPOPTS: 1172 val = np->rxopt.bits.ohopopts; 1173 break; 1174 1175 case IPV6_RECVDSTOPTS: 1176 val = np->rxopt.bits.dstopts; 1177 break; 1178 1179 case IPV6_2292DSTOPTS: 1180 val = np->rxopt.bits.odstopts; 1181 break; 1182 1183 case IPV6_TCLASS: 1184 val = np->tclass; 1185 break; 1186 1187 case IPV6_RECVTCLASS: 1188 val = np->rxopt.bits.rxtclass; 1189 break; 1190 1191 case IPV6_FLOWINFO: 1192 val = np->rxopt.bits.rxflow; 1193 break; 1194 1195 case IPV6_RECVPATHMTU: 1196 val = np->rxopt.bits.rxpmtu; 1197 break; 1198 1199 case IPV6_PATHMTU: 1200 { 1201 struct dst_entry *dst; 1202 struct ip6_mtuinfo mtuinfo; 1203 1204 if (len < sizeof(mtuinfo)) 1205 return -EINVAL; 1206 1207 len = sizeof(mtuinfo); 1208 memset(&mtuinfo, 0, sizeof(mtuinfo)); 1209 1210 rcu_read_lock(); 1211 dst = __sk_dst_get(sk); 1212 if (dst) 1213 mtuinfo.ip6m_mtu = dst_mtu(dst); 1214 rcu_read_unlock(); 1215 if (!mtuinfo.ip6m_mtu) 1216 return -ENOTCONN; 1217 1218 if (put_user(len, optlen)) 1219 return -EFAULT; 1220 if (copy_to_user(optval, &mtuinfo, len)) 1221 return -EFAULT; 1222 1223 return 0; 1224 } 1225 1226 case IPV6_TRANSPARENT: 1227 val = inet_sk(sk)->transparent; 1228 break; 1229 1230 case IPV6_FREEBIND: 1231 val = inet_sk(sk)->freebind; 1232 break; 1233 1234 case IPV6_RECVORIGDSTADDR: 1235 val = np->rxopt.bits.rxorigdstaddr; 1236 break; 1237 1238 case IPV6_UNICAST_HOPS: 1239 case IPV6_MULTICAST_HOPS: 1240 { 1241 struct dst_entry *dst; 1242 1243 if (optname == IPV6_UNICAST_HOPS) 1244 val = np->hop_limit; 1245 else 1246 val = np->mcast_hops; 1247 1248 if (val < 0) { 1249 rcu_read_lock(); 1250 dst = __sk_dst_get(sk); 1251 if (dst) 1252 val = ip6_dst_hoplimit(dst); 1253 rcu_read_unlock(); 1254 } 1255 1256 if (val < 0) 1257 val = sock_net(sk)->ipv6.devconf_all->hop_limit; 1258 break; 1259 } 1260 1261 case IPV6_MULTICAST_LOOP: 1262 val = np->mc_loop; 1263 break; 1264 1265 case IPV6_MULTICAST_IF: 1266 val = np->mcast_oif; 1267 break; 1268 1269 case IPV6_UNICAST_IF: 1270 val = (__force int)htonl((__u32) np->ucast_oif); 1271 break; 1272 1273 case IPV6_MTU_DISCOVER: 1274 val = np->pmtudisc; 1275 break; 1276 1277 case IPV6_RECVERR: 1278 val = np->recverr; 1279 break; 1280 1281 case IPV6_FLOWINFO_SEND: 1282 val = np->sndflow; 1283 break; 1284 1285 case IPV6_FLOWLABEL_MGR: 1286 { 1287 struct in6_flowlabel_req freq; 1288 int flags; 1289 1290 if (len < sizeof(freq)) 1291 return -EINVAL; 1292 1293 if (copy_from_user(&freq, optval, sizeof(freq))) 1294 return -EFAULT; 1295 1296 if (freq.flr_action != IPV6_FL_A_GET) 1297 return -EINVAL; 1298 1299 len = sizeof(freq); 1300 flags = freq.flr_flags; 1301 1302 memset(&freq, 0, sizeof(freq)); 1303 1304 val = ipv6_flowlabel_opt_get(sk, &freq, flags); 1305 if (val < 0) 1306 return val; 1307 1308 if (put_user(len, optlen)) 1309 return -EFAULT; 1310 if (copy_to_user(optval, &freq, len)) 1311 return -EFAULT; 1312 1313 return 0; 1314 } 1315 1316 case IPV6_ADDR_PREFERENCES: 1317 val = 0; 1318 1319 if (np->srcprefs & IPV6_PREFER_SRC_TMP) 1320 val |= IPV6_PREFER_SRC_TMP; 1321 else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC) 1322 val |= IPV6_PREFER_SRC_PUBLIC; 1323 else { 1324 /* XXX: should we return system default? */ 1325 val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT; 1326 } 1327 1328 if (np->srcprefs & IPV6_PREFER_SRC_COA) 1329 val |= IPV6_PREFER_SRC_COA; 1330 else 1331 val |= IPV6_PREFER_SRC_HOME; 1332 break; 1333 1334 case IPV6_MINHOPCOUNT: 1335 val = np->min_hopcount; 1336 break; 1337 1338 case IPV6_DONTFRAG: 1339 val = np->dontfrag; 1340 break; 1341 1342 case IPV6_AUTOFLOWLABEL: 1343 val = ip6_autoflowlabel(sock_net(sk), np); 1344 break; 1345 1346 case IPV6_RECVFRAGSIZE: 1347 val = np->rxopt.bits.recvfragsize; 1348 break; 1349 1350 default: 1351 return -ENOPROTOOPT; 1352 } 1353 len = min_t(unsigned int, sizeof(int), len); 1354 if (put_user(len, optlen)) 1355 return -EFAULT; 1356 if (copy_to_user(optval, &val, len)) 1357 return -EFAULT; 1358 return 0; 1359 } 1360 1361 int ipv6_getsockopt(struct sock *sk, int level, int optname, 1362 char __user *optval, int __user *optlen) 1363 { 1364 int err; 1365 1366 if (level == SOL_IP && sk->sk_type != SOCK_RAW) 1367 return udp_prot.getsockopt(sk, level, optname, optval, optlen); 1368 1369 if (level != SOL_IPV6) 1370 return -ENOPROTOOPT; 1371 1372 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen, 0); 1373 #ifdef CONFIG_NETFILTER 1374 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1375 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) { 1376 int len; 1377 1378 if (get_user(len, optlen)) 1379 return -EFAULT; 1380 1381 err = nf_getsockopt(sk, PF_INET6, optname, optval, &len); 1382 if (err >= 0) 1383 err = put_user(len, optlen); 1384 } 1385 #endif 1386 return err; 1387 } 1388 EXPORT_SYMBOL(ipv6_getsockopt); 1389 1390 #ifdef CONFIG_COMPAT 1391 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname, 1392 char __user *optval, int __user *optlen) 1393 { 1394 int err; 1395 1396 if (level == SOL_IP && sk->sk_type != SOCK_RAW) { 1397 if (udp_prot.compat_getsockopt != NULL) 1398 return udp_prot.compat_getsockopt(sk, level, optname, 1399 optval, optlen); 1400 return udp_prot.getsockopt(sk, level, optname, optval, optlen); 1401 } 1402 1403 if (level != SOL_IPV6) 1404 return -ENOPROTOOPT; 1405 1406 if (optname == MCAST_MSFILTER) 1407 return compat_mc_getsockopt(sk, level, optname, optval, optlen, 1408 ipv6_getsockopt); 1409 1410 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen, 1411 MSG_CMSG_COMPAT); 1412 #ifdef CONFIG_NETFILTER 1413 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1414 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) { 1415 int len; 1416 1417 if (get_user(len, optlen)) 1418 return -EFAULT; 1419 1420 err = compat_nf_getsockopt(sk, PF_INET6, optname, optval, &len); 1421 if (err >= 0) 1422 err = put_user(len, optlen); 1423 } 1424 #endif 1425 return err; 1426 } 1427 EXPORT_SYMBOL(compat_ipv6_getsockopt); 1428 #endif 1429