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