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; 401 402 /* remove any sticky options header with a zero option 403 * length, per RFC3542. 404 */ 405 if (optlen == 0) 406 optval = NULL; 407 else if (!optval) 408 goto e_inval; 409 else if (optlen < sizeof(struct ipv6_opt_hdr) || 410 optlen & 0x7 || optlen > 8 * 255) 411 goto e_inval; 412 413 /* hop-by-hop / destination options are privileged option */ 414 retv = -EPERM; 415 if (optname != IPV6_RTHDR && !ns_capable(net->user_ns, CAP_NET_RAW)) 416 break; 417 418 opt = rcu_dereference_protected(np->opt, 419 lockdep_sock_is_held(sk)); 420 opt = ipv6_renew_options(sk, opt, optname, 421 (struct ipv6_opt_hdr __user *)optval, 422 optlen); 423 if (IS_ERR(opt)) { 424 retv = PTR_ERR(opt); 425 break; 426 } 427 428 /* routing header option needs extra check */ 429 retv = -EINVAL; 430 if (optname == IPV6_RTHDR && opt && opt->srcrt) { 431 struct ipv6_rt_hdr *rthdr = opt->srcrt; 432 switch (rthdr->type) { 433 #if IS_ENABLED(CONFIG_IPV6_MIP6) 434 case IPV6_SRCRT_TYPE_2: 435 if (rthdr->hdrlen != 2 || 436 rthdr->segments_left != 1) 437 goto sticky_done; 438 439 break; 440 #endif 441 case IPV6_SRCRT_TYPE_4: 442 { 443 struct ipv6_sr_hdr *srh = (struct ipv6_sr_hdr *) 444 opt->srcrt; 445 446 if (!seg6_validate_srh(srh, optlen)) 447 goto sticky_done; 448 break; 449 } 450 default: 451 goto sticky_done; 452 } 453 } 454 455 retv = 0; 456 opt = ipv6_update_options(sk, opt); 457 sticky_done: 458 if (opt) { 459 atomic_sub(opt->tot_len, &sk->sk_omem_alloc); 460 txopt_put(opt); 461 } 462 break; 463 } 464 465 case IPV6_PKTINFO: 466 { 467 struct in6_pktinfo pkt; 468 469 if (optlen == 0) 470 goto e_inval; 471 else if (optlen < sizeof(struct in6_pktinfo) || !optval) 472 goto e_inval; 473 474 if (copy_from_user(&pkt, optval, sizeof(struct in6_pktinfo))) { 475 retv = -EFAULT; 476 break; 477 } 478 if (sk->sk_bound_dev_if && pkt.ipi6_ifindex != sk->sk_bound_dev_if) 479 goto e_inval; 480 481 np->sticky_pktinfo.ipi6_ifindex = pkt.ipi6_ifindex; 482 np->sticky_pktinfo.ipi6_addr = pkt.ipi6_addr; 483 retv = 0; 484 break; 485 } 486 487 case IPV6_2292PKTOPTIONS: 488 { 489 struct ipv6_txoptions *opt = NULL; 490 struct msghdr msg; 491 struct flowi6 fl6; 492 struct sockcm_cookie sockc_junk; 493 struct ipcm6_cookie ipc6; 494 495 memset(&fl6, 0, sizeof(fl6)); 496 fl6.flowi6_oif = sk->sk_bound_dev_if; 497 fl6.flowi6_mark = sk->sk_mark; 498 499 if (optlen == 0) 500 goto update; 501 502 /* 1K is probably excessive 503 * 1K is surely not enough, 2K per standard header is 16K. 504 */ 505 retv = -EINVAL; 506 if (optlen > 64*1024) 507 break; 508 509 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL); 510 retv = -ENOBUFS; 511 if (!opt) 512 break; 513 514 memset(opt, 0, sizeof(*opt)); 515 refcount_set(&opt->refcnt, 1); 516 opt->tot_len = sizeof(*opt) + optlen; 517 retv = -EFAULT; 518 if (copy_from_user(opt+1, optval, optlen)) 519 goto done; 520 521 msg.msg_controllen = optlen; 522 msg.msg_control = (void *)(opt+1); 523 ipc6.opt = opt; 524 525 retv = ip6_datagram_send_ctl(net, sk, &msg, &fl6, &ipc6, &sockc_junk); 526 if (retv) 527 goto done; 528 update: 529 retv = 0; 530 opt = ipv6_update_options(sk, opt); 531 done: 532 if (opt) { 533 atomic_sub(opt->tot_len, &sk->sk_omem_alloc); 534 txopt_put(opt); 535 } 536 break; 537 } 538 case IPV6_UNICAST_HOPS: 539 if (optlen < sizeof(int)) 540 goto e_inval; 541 if (val > 255 || val < -1) 542 goto e_inval; 543 np->hop_limit = val; 544 retv = 0; 545 break; 546 547 case IPV6_MULTICAST_HOPS: 548 if (sk->sk_type == SOCK_STREAM) 549 break; 550 if (optlen < sizeof(int)) 551 goto e_inval; 552 if (val > 255 || val < -1) 553 goto e_inval; 554 np->mcast_hops = (val == -1 ? IPV6_DEFAULT_MCASTHOPS : val); 555 retv = 0; 556 break; 557 558 case IPV6_MULTICAST_LOOP: 559 if (optlen < sizeof(int)) 560 goto e_inval; 561 if (val != valbool) 562 goto e_inval; 563 np->mc_loop = valbool; 564 retv = 0; 565 break; 566 567 case IPV6_UNICAST_IF: 568 { 569 struct net_device *dev = NULL; 570 int ifindex; 571 572 if (optlen != sizeof(int)) 573 goto e_inval; 574 575 ifindex = (__force int)ntohl((__force __be32)val); 576 if (ifindex == 0) { 577 np->ucast_oif = 0; 578 retv = 0; 579 break; 580 } 581 582 dev = dev_get_by_index(net, ifindex); 583 retv = -EADDRNOTAVAIL; 584 if (!dev) 585 break; 586 dev_put(dev); 587 588 retv = -EINVAL; 589 if (sk->sk_bound_dev_if) 590 break; 591 592 np->ucast_oif = ifindex; 593 retv = 0; 594 break; 595 } 596 597 case IPV6_MULTICAST_IF: 598 if (sk->sk_type == SOCK_STREAM) 599 break; 600 if (optlen < sizeof(int)) 601 goto e_inval; 602 603 if (val) { 604 struct net_device *dev; 605 int midx; 606 607 rcu_read_lock(); 608 609 dev = dev_get_by_index_rcu(net, val); 610 if (!dev) { 611 rcu_read_unlock(); 612 retv = -ENODEV; 613 break; 614 } 615 midx = l3mdev_master_ifindex_rcu(dev); 616 617 rcu_read_unlock(); 618 619 if (sk->sk_bound_dev_if && 620 sk->sk_bound_dev_if != val && 621 (!midx || midx != sk->sk_bound_dev_if)) 622 goto e_inval; 623 } 624 np->mcast_oif = val; 625 retv = 0; 626 break; 627 case IPV6_ADD_MEMBERSHIP: 628 case IPV6_DROP_MEMBERSHIP: 629 { 630 struct ipv6_mreq mreq; 631 632 if (optlen < sizeof(struct ipv6_mreq)) 633 goto e_inval; 634 635 retv = -EPROTO; 636 if (inet_sk(sk)->is_icsk) 637 break; 638 639 retv = -EFAULT; 640 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq))) 641 break; 642 643 if (optname == IPV6_ADD_MEMBERSHIP) 644 retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr); 645 else 646 retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr); 647 break; 648 } 649 case IPV6_JOIN_ANYCAST: 650 case IPV6_LEAVE_ANYCAST: 651 { 652 struct ipv6_mreq mreq; 653 654 if (optlen < sizeof(struct ipv6_mreq)) 655 goto e_inval; 656 657 retv = -EFAULT; 658 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq))) 659 break; 660 661 if (optname == IPV6_JOIN_ANYCAST) 662 retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr); 663 else 664 retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr); 665 break; 666 } 667 case MCAST_JOIN_GROUP: 668 case MCAST_LEAVE_GROUP: 669 { 670 struct group_req greq; 671 struct sockaddr_in6 *psin6; 672 673 if (optlen < sizeof(struct group_req)) 674 goto e_inval; 675 676 retv = -EFAULT; 677 if (copy_from_user(&greq, optval, sizeof(struct group_req))) 678 break; 679 if (greq.gr_group.ss_family != AF_INET6) { 680 retv = -EADDRNOTAVAIL; 681 break; 682 } 683 psin6 = (struct sockaddr_in6 *)&greq.gr_group; 684 if (optname == MCAST_JOIN_GROUP) 685 retv = ipv6_sock_mc_join(sk, greq.gr_interface, 686 &psin6->sin6_addr); 687 else 688 retv = ipv6_sock_mc_drop(sk, greq.gr_interface, 689 &psin6->sin6_addr); 690 break; 691 } 692 case MCAST_JOIN_SOURCE_GROUP: 693 case MCAST_LEAVE_SOURCE_GROUP: 694 case MCAST_BLOCK_SOURCE: 695 case MCAST_UNBLOCK_SOURCE: 696 { 697 struct group_source_req greqs; 698 int omode, add; 699 700 if (optlen < sizeof(struct group_source_req)) 701 goto e_inval; 702 if (copy_from_user(&greqs, optval, sizeof(greqs))) { 703 retv = -EFAULT; 704 break; 705 } 706 if (greqs.gsr_group.ss_family != AF_INET6 || 707 greqs.gsr_source.ss_family != AF_INET6) { 708 retv = -EADDRNOTAVAIL; 709 break; 710 } 711 if (optname == MCAST_BLOCK_SOURCE) { 712 omode = MCAST_EXCLUDE; 713 add = 1; 714 } else if (optname == MCAST_UNBLOCK_SOURCE) { 715 omode = MCAST_EXCLUDE; 716 add = 0; 717 } else if (optname == MCAST_JOIN_SOURCE_GROUP) { 718 struct sockaddr_in6 *psin6; 719 720 psin6 = (struct sockaddr_in6 *)&greqs.gsr_group; 721 retv = ipv6_sock_mc_join(sk, greqs.gsr_interface, 722 &psin6->sin6_addr); 723 /* prior join w/ different source is ok */ 724 if (retv && retv != -EADDRINUSE) 725 break; 726 omode = MCAST_INCLUDE; 727 add = 1; 728 } else /* MCAST_LEAVE_SOURCE_GROUP */ { 729 omode = MCAST_INCLUDE; 730 add = 0; 731 } 732 retv = ip6_mc_source(add, omode, sk, &greqs); 733 break; 734 } 735 case MCAST_MSFILTER: 736 { 737 struct group_filter *gsf; 738 739 if (optlen < GROUP_FILTER_SIZE(0)) 740 goto e_inval; 741 if (optlen > sysctl_optmem_max) { 742 retv = -ENOBUFS; 743 break; 744 } 745 gsf = memdup_user(optval, optlen); 746 if (IS_ERR(gsf)) { 747 retv = PTR_ERR(gsf); 748 break; 749 } 750 /* numsrc >= (4G-140)/128 overflow in 32 bits */ 751 if (gsf->gf_numsrc >= 0x1ffffffU || 752 gsf->gf_numsrc > sysctl_mld_max_msf) { 753 kfree(gsf); 754 retv = -ENOBUFS; 755 break; 756 } 757 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) { 758 kfree(gsf); 759 retv = -EINVAL; 760 break; 761 } 762 retv = ip6_mc_msfilter(sk, gsf); 763 kfree(gsf); 764 765 break; 766 } 767 case IPV6_ROUTER_ALERT: 768 if (optlen < sizeof(int)) 769 goto e_inval; 770 retv = ip6_ra_control(sk, val); 771 break; 772 case IPV6_MTU_DISCOVER: 773 if (optlen < sizeof(int)) 774 goto e_inval; 775 if (val < IPV6_PMTUDISC_DONT || val > IPV6_PMTUDISC_OMIT) 776 goto e_inval; 777 np->pmtudisc = val; 778 retv = 0; 779 break; 780 case IPV6_MTU: 781 if (optlen < sizeof(int)) 782 goto e_inval; 783 if (val && val < IPV6_MIN_MTU) 784 goto e_inval; 785 np->frag_size = val; 786 retv = 0; 787 break; 788 case IPV6_RECVERR: 789 if (optlen < sizeof(int)) 790 goto e_inval; 791 np->recverr = valbool; 792 if (!val) 793 skb_queue_purge(&sk->sk_error_queue); 794 retv = 0; 795 break; 796 case IPV6_FLOWINFO_SEND: 797 if (optlen < sizeof(int)) 798 goto e_inval; 799 np->sndflow = valbool; 800 retv = 0; 801 break; 802 case IPV6_FLOWLABEL_MGR: 803 retv = ipv6_flowlabel_opt(sk, optval, optlen); 804 break; 805 case IPV6_IPSEC_POLICY: 806 case IPV6_XFRM_POLICY: 807 retv = -EPERM; 808 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 809 break; 810 retv = xfrm_user_policy(sk, optname, optval, optlen); 811 break; 812 813 case IPV6_ADDR_PREFERENCES: 814 { 815 unsigned int pref = 0; 816 unsigned int prefmask = ~0; 817 818 if (optlen < sizeof(int)) 819 goto e_inval; 820 821 retv = -EINVAL; 822 823 /* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */ 824 switch (val & (IPV6_PREFER_SRC_PUBLIC| 825 IPV6_PREFER_SRC_TMP| 826 IPV6_PREFER_SRC_PUBTMP_DEFAULT)) { 827 case IPV6_PREFER_SRC_PUBLIC: 828 pref |= IPV6_PREFER_SRC_PUBLIC; 829 break; 830 case IPV6_PREFER_SRC_TMP: 831 pref |= IPV6_PREFER_SRC_TMP; 832 break; 833 case IPV6_PREFER_SRC_PUBTMP_DEFAULT: 834 break; 835 case 0: 836 goto pref_skip_pubtmp; 837 default: 838 goto e_inval; 839 } 840 841 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC| 842 IPV6_PREFER_SRC_TMP); 843 pref_skip_pubtmp: 844 845 /* check HOME/COA conflicts */ 846 switch (val & (IPV6_PREFER_SRC_HOME|IPV6_PREFER_SRC_COA)) { 847 case IPV6_PREFER_SRC_HOME: 848 break; 849 case IPV6_PREFER_SRC_COA: 850 pref |= IPV6_PREFER_SRC_COA; 851 case 0: 852 goto pref_skip_coa; 853 default: 854 goto e_inval; 855 } 856 857 prefmask &= ~IPV6_PREFER_SRC_COA; 858 pref_skip_coa: 859 860 /* check CGA/NONCGA conflicts */ 861 switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) { 862 case IPV6_PREFER_SRC_CGA: 863 case IPV6_PREFER_SRC_NONCGA: 864 case 0: 865 break; 866 default: 867 goto e_inval; 868 } 869 870 np->srcprefs = (np->srcprefs & prefmask) | pref; 871 retv = 0; 872 873 break; 874 } 875 case IPV6_MINHOPCOUNT: 876 if (optlen < sizeof(int)) 877 goto e_inval; 878 if (val < 0 || val > 255) 879 goto e_inval; 880 np->min_hopcount = val; 881 retv = 0; 882 break; 883 case IPV6_DONTFRAG: 884 np->dontfrag = valbool; 885 retv = 0; 886 break; 887 case IPV6_AUTOFLOWLABEL: 888 np->autoflowlabel = valbool; 889 np->autoflowlabel_set = 1; 890 retv = 0; 891 break; 892 case IPV6_RECVFRAGSIZE: 893 np->rxopt.bits.recvfragsize = valbool; 894 retv = 0; 895 break; 896 } 897 898 release_sock(sk); 899 if (needs_rtnl) 900 rtnl_unlock(); 901 902 return retv; 903 904 e_inval: 905 release_sock(sk); 906 if (needs_rtnl) 907 rtnl_unlock(); 908 return -EINVAL; 909 } 910 911 int ipv6_setsockopt(struct sock *sk, int level, int optname, 912 char __user *optval, unsigned int optlen) 913 { 914 int err; 915 916 if (level == SOL_IP && sk->sk_type != SOCK_RAW) 917 return udp_prot.setsockopt(sk, level, optname, optval, optlen); 918 919 if (level != SOL_IPV6) 920 return -ENOPROTOOPT; 921 922 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen); 923 #ifdef CONFIG_NETFILTER 924 /* we need to exclude all possible ENOPROTOOPTs except default case */ 925 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY && 926 optname != IPV6_XFRM_POLICY) 927 err = nf_setsockopt(sk, PF_INET6, optname, optval, optlen); 928 #endif 929 return err; 930 } 931 EXPORT_SYMBOL(ipv6_setsockopt); 932 933 #ifdef CONFIG_COMPAT 934 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname, 935 char __user *optval, unsigned int optlen) 936 { 937 int err; 938 939 if (level == SOL_IP && sk->sk_type != SOCK_RAW) { 940 if (udp_prot.compat_setsockopt != NULL) 941 return udp_prot.compat_setsockopt(sk, level, optname, 942 optval, optlen); 943 return udp_prot.setsockopt(sk, level, optname, optval, optlen); 944 } 945 946 if (level != SOL_IPV6) 947 return -ENOPROTOOPT; 948 949 if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER) 950 return compat_mc_setsockopt(sk, level, optname, optval, optlen, 951 ipv6_setsockopt); 952 953 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen); 954 #ifdef CONFIG_NETFILTER 955 /* we need to exclude all possible ENOPROTOOPTs except default case */ 956 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY && 957 optname != IPV6_XFRM_POLICY) 958 err = compat_nf_setsockopt(sk, PF_INET6, optname, optval, 959 optlen); 960 #endif 961 return err; 962 } 963 EXPORT_SYMBOL(compat_ipv6_setsockopt); 964 #endif 965 966 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt, 967 int optname, char __user *optval, int len) 968 { 969 struct ipv6_opt_hdr *hdr; 970 971 if (!opt) 972 return 0; 973 974 switch (optname) { 975 case IPV6_HOPOPTS: 976 hdr = opt->hopopt; 977 break; 978 case IPV6_RTHDRDSTOPTS: 979 hdr = opt->dst0opt; 980 break; 981 case IPV6_RTHDR: 982 hdr = (struct ipv6_opt_hdr *)opt->srcrt; 983 break; 984 case IPV6_DSTOPTS: 985 hdr = opt->dst1opt; 986 break; 987 default: 988 return -EINVAL; /* should not happen */ 989 } 990 991 if (!hdr) 992 return 0; 993 994 len = min_t(unsigned int, len, ipv6_optlen(hdr)); 995 if (copy_to_user(optval, hdr, len)) 996 return -EFAULT; 997 return len; 998 } 999 1000 static int do_ipv6_getsockopt(struct sock *sk, int level, int optname, 1001 char __user *optval, int __user *optlen, unsigned int flags) 1002 { 1003 struct ipv6_pinfo *np = inet6_sk(sk); 1004 int len; 1005 int val; 1006 1007 if (ip6_mroute_opt(optname)) 1008 return ip6_mroute_getsockopt(sk, optname, optval, optlen); 1009 1010 if (get_user(len, optlen)) 1011 return -EFAULT; 1012 switch (optname) { 1013 case IPV6_ADDRFORM: 1014 if (sk->sk_protocol != IPPROTO_UDP && 1015 sk->sk_protocol != IPPROTO_UDPLITE && 1016 sk->sk_protocol != IPPROTO_TCP) 1017 return -ENOPROTOOPT; 1018 if (sk->sk_state != TCP_ESTABLISHED) 1019 return -ENOTCONN; 1020 val = sk->sk_family; 1021 break; 1022 case MCAST_MSFILTER: 1023 { 1024 struct group_filter gsf; 1025 int err; 1026 1027 if (len < GROUP_FILTER_SIZE(0)) 1028 return -EINVAL; 1029 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) 1030 return -EFAULT; 1031 if (gsf.gf_group.ss_family != AF_INET6) 1032 return -EADDRNOTAVAIL; 1033 lock_sock(sk); 1034 err = ip6_mc_msfget(sk, &gsf, 1035 (struct group_filter __user *)optval, optlen); 1036 release_sock(sk); 1037 return err; 1038 } 1039 1040 case IPV6_2292PKTOPTIONS: 1041 { 1042 struct msghdr msg; 1043 struct sk_buff *skb; 1044 1045 if (sk->sk_type != SOCK_STREAM) 1046 return -ENOPROTOOPT; 1047 1048 msg.msg_control = optval; 1049 msg.msg_controllen = len; 1050 msg.msg_flags = flags; 1051 1052 lock_sock(sk); 1053 skb = np->pktoptions; 1054 if (skb) 1055 ip6_datagram_recv_ctl(sk, &msg, skb); 1056 release_sock(sk); 1057 if (!skb) { 1058 if (np->rxopt.bits.rxinfo) { 1059 struct in6_pktinfo src_info; 1060 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif : 1061 np->sticky_pktinfo.ipi6_ifindex; 1062 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr : np->sticky_pktinfo.ipi6_addr; 1063 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info); 1064 } 1065 if (np->rxopt.bits.rxhlim) { 1066 int hlim = np->mcast_hops; 1067 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim); 1068 } 1069 if (np->rxopt.bits.rxtclass) { 1070 int tclass = (int)ip6_tclass(np->rcv_flowinfo); 1071 1072 put_cmsg(&msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass); 1073 } 1074 if (np->rxopt.bits.rxoinfo) { 1075 struct in6_pktinfo src_info; 1076 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif : 1077 np->sticky_pktinfo.ipi6_ifindex; 1078 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr : 1079 np->sticky_pktinfo.ipi6_addr; 1080 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info); 1081 } 1082 if (np->rxopt.bits.rxohlim) { 1083 int hlim = np->mcast_hops; 1084 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim); 1085 } 1086 if (np->rxopt.bits.rxflow) { 1087 __be32 flowinfo = np->rcv_flowinfo; 1088 1089 put_cmsg(&msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo); 1090 } 1091 } 1092 len -= msg.msg_controllen; 1093 return put_user(len, optlen); 1094 } 1095 case IPV6_MTU: 1096 { 1097 struct dst_entry *dst; 1098 1099 val = 0; 1100 rcu_read_lock(); 1101 dst = __sk_dst_get(sk); 1102 if (dst) 1103 val = dst_mtu(dst); 1104 rcu_read_unlock(); 1105 if (!val) 1106 return -ENOTCONN; 1107 break; 1108 } 1109 1110 case IPV6_V6ONLY: 1111 val = sk->sk_ipv6only; 1112 break; 1113 1114 case IPV6_RECVPKTINFO: 1115 val = np->rxopt.bits.rxinfo; 1116 break; 1117 1118 case IPV6_2292PKTINFO: 1119 val = np->rxopt.bits.rxoinfo; 1120 break; 1121 1122 case IPV6_RECVHOPLIMIT: 1123 val = np->rxopt.bits.rxhlim; 1124 break; 1125 1126 case IPV6_2292HOPLIMIT: 1127 val = np->rxopt.bits.rxohlim; 1128 break; 1129 1130 case IPV6_RECVRTHDR: 1131 val = np->rxopt.bits.srcrt; 1132 break; 1133 1134 case IPV6_2292RTHDR: 1135 val = np->rxopt.bits.osrcrt; 1136 break; 1137 1138 case IPV6_HOPOPTS: 1139 case IPV6_RTHDRDSTOPTS: 1140 case IPV6_RTHDR: 1141 case IPV6_DSTOPTS: 1142 { 1143 struct ipv6_txoptions *opt; 1144 1145 lock_sock(sk); 1146 opt = rcu_dereference_protected(np->opt, 1147 lockdep_sock_is_held(sk)); 1148 len = ipv6_getsockopt_sticky(sk, opt, optname, optval, len); 1149 release_sock(sk); 1150 /* check if ipv6_getsockopt_sticky() returns err code */ 1151 if (len < 0) 1152 return len; 1153 return put_user(len, optlen); 1154 } 1155 1156 case IPV6_RECVHOPOPTS: 1157 val = np->rxopt.bits.hopopts; 1158 break; 1159 1160 case IPV6_2292HOPOPTS: 1161 val = np->rxopt.bits.ohopopts; 1162 break; 1163 1164 case IPV6_RECVDSTOPTS: 1165 val = np->rxopt.bits.dstopts; 1166 break; 1167 1168 case IPV6_2292DSTOPTS: 1169 val = np->rxopt.bits.odstopts; 1170 break; 1171 1172 case IPV6_TCLASS: 1173 val = np->tclass; 1174 break; 1175 1176 case IPV6_RECVTCLASS: 1177 val = np->rxopt.bits.rxtclass; 1178 break; 1179 1180 case IPV6_FLOWINFO: 1181 val = np->rxopt.bits.rxflow; 1182 break; 1183 1184 case IPV6_RECVPATHMTU: 1185 val = np->rxopt.bits.rxpmtu; 1186 break; 1187 1188 case IPV6_PATHMTU: 1189 { 1190 struct dst_entry *dst; 1191 struct ip6_mtuinfo mtuinfo; 1192 1193 if (len < sizeof(mtuinfo)) 1194 return -EINVAL; 1195 1196 len = sizeof(mtuinfo); 1197 memset(&mtuinfo, 0, sizeof(mtuinfo)); 1198 1199 rcu_read_lock(); 1200 dst = __sk_dst_get(sk); 1201 if (dst) 1202 mtuinfo.ip6m_mtu = dst_mtu(dst); 1203 rcu_read_unlock(); 1204 if (!mtuinfo.ip6m_mtu) 1205 return -ENOTCONN; 1206 1207 if (put_user(len, optlen)) 1208 return -EFAULT; 1209 if (copy_to_user(optval, &mtuinfo, len)) 1210 return -EFAULT; 1211 1212 return 0; 1213 } 1214 1215 case IPV6_TRANSPARENT: 1216 val = inet_sk(sk)->transparent; 1217 break; 1218 1219 case IPV6_FREEBIND: 1220 val = inet_sk(sk)->freebind; 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 = ip6_autoflowlabel(sock_net(sk), np); 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 err = nf_getsockopt(sk, PF_INET6, optname, optval, &len); 1371 if (err >= 0) 1372 err = put_user(len, optlen); 1373 } 1374 #endif 1375 return err; 1376 } 1377 EXPORT_SYMBOL(ipv6_getsockopt); 1378 1379 #ifdef CONFIG_COMPAT 1380 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname, 1381 char __user *optval, int __user *optlen) 1382 { 1383 int err; 1384 1385 if (level == SOL_IP && sk->sk_type != SOCK_RAW) { 1386 if (udp_prot.compat_getsockopt != NULL) 1387 return udp_prot.compat_getsockopt(sk, level, optname, 1388 optval, optlen); 1389 return udp_prot.getsockopt(sk, level, optname, optval, optlen); 1390 } 1391 1392 if (level != SOL_IPV6) 1393 return -ENOPROTOOPT; 1394 1395 if (optname == MCAST_MSFILTER) 1396 return compat_mc_getsockopt(sk, level, optname, optval, optlen, 1397 ipv6_getsockopt); 1398 1399 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen, 1400 MSG_CMSG_COMPAT); 1401 #ifdef CONFIG_NETFILTER 1402 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1403 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) { 1404 int len; 1405 1406 if (get_user(len, optlen)) 1407 return -EFAULT; 1408 1409 err = compat_nf_getsockopt(sk, PF_INET6, optname, optval, &len); 1410 if (err >= 0) 1411 err = put_user(len, optlen); 1412 } 1413 #endif 1414 return err; 1415 } 1416 EXPORT_SYMBOL(compat_ipv6_getsockopt); 1417 #endif 1418