1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * IPv6 BSD socket options interface 4 * Linux INET6 implementation 5 * 6 * Authors: 7 * Pedro Roque <roque@di.fc.ul.pt> 8 * 9 * Based on linux/net/ipv4/ip_sockglue.c 10 * 11 * FIXME: Make the setsockopt code POSIX compliant: That is 12 * 13 * o Truncate getsockopt returns 14 * o Return an optlen of the truncated length if need be 15 * 16 * Changes: 17 * David L Stevens <dlstevens@us.ibm.com>: 18 * - added multicast source filtering API for MLDv2 19 */ 20 21 #include <linux/module.h> 22 #include <linux/capability.h> 23 #include <linux/errno.h> 24 #include <linux/types.h> 25 #include <linux/socket.h> 26 #include <linux/sockios.h> 27 #include <linux/net.h> 28 #include <linux/in6.h> 29 #include <linux/mroute6.h> 30 #include <linux/netdevice.h> 31 #include <linux/if_arp.h> 32 #include <linux/init.h> 33 #include <linux/sysctl.h> 34 #include <linux/netfilter.h> 35 #include <linux/slab.h> 36 37 #include <net/sock.h> 38 #include <net/snmp.h> 39 #include <net/ipv6.h> 40 #include <net/ndisc.h> 41 #include <net/protocol.h> 42 #include <net/transp_v6.h> 43 #include <net/ip6_route.h> 44 #include <net/addrconf.h> 45 #include <net/inet_common.h> 46 #include <net/tcp.h> 47 #include <net/udp.h> 48 #include <net/udplite.h> 49 #include <net/xfrm.h> 50 #include <net/compat.h> 51 #include <net/seg6.h> 52 53 #include <linux/uaccess.h> 54 55 struct ip6_ra_chain *ip6_ra_chain; 56 DEFINE_RWLOCK(ip6_ra_lock); 57 58 int ip6_ra_control(struct sock *sk, int sel) 59 { 60 struct ip6_ra_chain *ra, *new_ra, **rap; 61 62 /* RA packet may be delivered ONLY to IPPROTO_RAW socket */ 63 if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num != IPPROTO_RAW) 64 return -ENOPROTOOPT; 65 66 new_ra = (sel >= 0) ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL; 67 if (sel >= 0 && !new_ra) 68 return -ENOMEM; 69 70 write_lock_bh(&ip6_ra_lock); 71 for (rap = &ip6_ra_chain; (ra = *rap) != NULL; rap = &ra->next) { 72 if (ra->sk == sk) { 73 if (sel >= 0) { 74 write_unlock_bh(&ip6_ra_lock); 75 kfree(new_ra); 76 return -EADDRINUSE; 77 } 78 79 *rap = ra->next; 80 write_unlock_bh(&ip6_ra_lock); 81 82 sock_put(sk); 83 kfree(ra); 84 return 0; 85 } 86 } 87 if (!new_ra) { 88 write_unlock_bh(&ip6_ra_lock); 89 return -ENOBUFS; 90 } 91 new_ra->sk = sk; 92 new_ra->sel = sel; 93 new_ra->next = ra; 94 *rap = new_ra; 95 sock_hold(sk); 96 write_unlock_bh(&ip6_ra_lock); 97 return 0; 98 } 99 100 struct ipv6_txoptions *ipv6_update_options(struct sock *sk, 101 struct ipv6_txoptions *opt) 102 { 103 if (inet_sk(sk)->is_icsk) { 104 if (opt && 105 !((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) && 106 inet_sk(sk)->inet_daddr != LOOPBACK4_IPV6) { 107 struct inet_connection_sock *icsk = inet_csk(sk); 108 icsk->icsk_ext_hdr_len = opt->opt_flen + opt->opt_nflen; 109 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie); 110 } 111 } 112 opt = xchg((__force struct ipv6_txoptions **)&inet6_sk(sk)->opt, 113 opt); 114 sk_dst_reset(sk); 115 116 return opt; 117 } 118 119 static bool setsockopt_needs_rtnl(int optname) 120 { 121 switch (optname) { 122 case IPV6_ADDRFORM: 123 case IPV6_ADD_MEMBERSHIP: 124 case IPV6_DROP_MEMBERSHIP: 125 case IPV6_JOIN_ANYCAST: 126 case IPV6_LEAVE_ANYCAST: 127 case MCAST_JOIN_GROUP: 128 case MCAST_LEAVE_GROUP: 129 case MCAST_JOIN_SOURCE_GROUP: 130 case MCAST_LEAVE_SOURCE_GROUP: 131 case MCAST_BLOCK_SOURCE: 132 case MCAST_UNBLOCK_SOURCE: 133 case MCAST_MSFILTER: 134 return true; 135 } 136 return false; 137 } 138 139 static int do_ipv6_mcast_group_source(struct sock *sk, int optname, 140 struct group_source_req *greqs) 141 { 142 int omode, add; 143 144 if (greqs->gsr_group.ss_family != AF_INET6 || 145 greqs->gsr_source.ss_family != AF_INET6) 146 return -EADDRNOTAVAIL; 147 148 if (optname == MCAST_BLOCK_SOURCE) { 149 omode = MCAST_EXCLUDE; 150 add = 1; 151 } else if (optname == MCAST_UNBLOCK_SOURCE) { 152 omode = MCAST_EXCLUDE; 153 add = 0; 154 } else if (optname == MCAST_JOIN_SOURCE_GROUP) { 155 struct sockaddr_in6 *psin6; 156 int retv; 157 158 psin6 = (struct sockaddr_in6 *)&greqs->gsr_group; 159 retv = ipv6_sock_mc_join_ssm(sk, greqs->gsr_interface, 160 &psin6->sin6_addr, 161 MCAST_INCLUDE); 162 /* prior join w/ different source is ok */ 163 if (retv && retv != -EADDRINUSE) 164 return retv; 165 omode = MCAST_INCLUDE; 166 add = 1; 167 } else /* MCAST_LEAVE_SOURCE_GROUP */ { 168 omode = MCAST_INCLUDE; 169 add = 0; 170 } 171 return ip6_mc_source(add, omode, sk, greqs); 172 } 173 174 static int do_ipv6_setsockopt(struct sock *sk, int level, int optname, 175 char __user *optval, unsigned int optlen) 176 { 177 struct ipv6_pinfo *np = inet6_sk(sk); 178 struct net *net = sock_net(sk); 179 int val, valbool; 180 int retv = -ENOPROTOOPT; 181 bool needs_rtnl = setsockopt_needs_rtnl(optname); 182 183 if (!optval) 184 val = 0; 185 else { 186 if (optlen >= sizeof(int)) { 187 if (get_user(val, (int __user *) optval)) 188 return -EFAULT; 189 } else 190 val = 0; 191 } 192 193 valbool = (val != 0); 194 195 if (ip6_mroute_opt(optname)) 196 return ip6_mroute_setsockopt(sk, optname, optval, optlen); 197 198 if (needs_rtnl) 199 rtnl_lock(); 200 lock_sock(sk); 201 202 switch (optname) { 203 204 case IPV6_ADDRFORM: 205 if (optlen < sizeof(int)) 206 goto e_inval; 207 if (val == PF_INET) { 208 struct ipv6_txoptions *opt; 209 struct sk_buff *pktopt; 210 211 if (sk->sk_type == SOCK_RAW) 212 break; 213 214 if (sk->sk_protocol == IPPROTO_UDP || 215 sk->sk_protocol == IPPROTO_UDPLITE) { 216 struct udp_sock *up = udp_sk(sk); 217 if (up->pending == AF_INET6) { 218 retv = -EBUSY; 219 break; 220 } 221 } else if (sk->sk_protocol == IPPROTO_TCP) { 222 if (sk->sk_prot != &tcpv6_prot) { 223 retv = -EBUSY; 224 break; 225 } 226 } else { 227 break; 228 } 229 230 if (sk->sk_state != TCP_ESTABLISHED) { 231 retv = -ENOTCONN; 232 break; 233 } 234 235 if (ipv6_only_sock(sk) || 236 !ipv6_addr_v4mapped(&sk->sk_v6_daddr)) { 237 retv = -EADDRNOTAVAIL; 238 break; 239 } 240 241 fl6_free_socklist(sk); 242 __ipv6_sock_mc_close(sk); 243 __ipv6_sock_ac_close(sk); 244 245 /* 246 * Sock is moving from IPv6 to IPv4 (sk_prot), so 247 * remove it from the refcnt debug socks count in the 248 * original family... 249 */ 250 sk_refcnt_debug_dec(sk); 251 252 if (sk->sk_protocol == IPPROTO_TCP) { 253 struct inet_connection_sock *icsk = inet_csk(sk); 254 local_bh_disable(); 255 sock_prot_inuse_add(net, sk->sk_prot, -1); 256 sock_prot_inuse_add(net, &tcp_prot, 1); 257 local_bh_enable(); 258 sk->sk_prot = &tcp_prot; 259 icsk->icsk_af_ops = &ipv4_specific; 260 sk->sk_socket->ops = &inet_stream_ops; 261 sk->sk_family = PF_INET; 262 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie); 263 } else { 264 struct proto *prot = &udp_prot; 265 266 if (sk->sk_protocol == IPPROTO_UDPLITE) 267 prot = &udplite_prot; 268 local_bh_disable(); 269 sock_prot_inuse_add(net, sk->sk_prot, -1); 270 sock_prot_inuse_add(net, prot, 1); 271 local_bh_enable(); 272 sk->sk_prot = prot; 273 sk->sk_socket->ops = &inet_dgram_ops; 274 sk->sk_family = PF_INET; 275 } 276 opt = xchg((__force struct ipv6_txoptions **)&np->opt, 277 NULL); 278 if (opt) { 279 atomic_sub(opt->tot_len, &sk->sk_omem_alloc); 280 txopt_put(opt); 281 } 282 pktopt = xchg(&np->pktoptions, NULL); 283 kfree_skb(pktopt); 284 285 /* 286 * ... and add it to the refcnt debug socks count 287 * in the new family. -acme 288 */ 289 sk_refcnt_debug_inc(sk); 290 module_put(THIS_MODULE); 291 retv = 0; 292 break; 293 } 294 goto e_inval; 295 296 case IPV6_V6ONLY: 297 if (optlen < sizeof(int) || 298 inet_sk(sk)->inet_num) 299 goto e_inval; 300 sk->sk_ipv6only = valbool; 301 retv = 0; 302 break; 303 304 case IPV6_RECVPKTINFO: 305 if (optlen < sizeof(int)) 306 goto e_inval; 307 np->rxopt.bits.rxinfo = valbool; 308 retv = 0; 309 break; 310 311 case IPV6_2292PKTINFO: 312 if (optlen < sizeof(int)) 313 goto e_inval; 314 np->rxopt.bits.rxoinfo = valbool; 315 retv = 0; 316 break; 317 318 case IPV6_RECVHOPLIMIT: 319 if (optlen < sizeof(int)) 320 goto e_inval; 321 np->rxopt.bits.rxhlim = valbool; 322 retv = 0; 323 break; 324 325 case IPV6_2292HOPLIMIT: 326 if (optlen < sizeof(int)) 327 goto e_inval; 328 np->rxopt.bits.rxohlim = valbool; 329 retv = 0; 330 break; 331 332 case IPV6_RECVRTHDR: 333 if (optlen < sizeof(int)) 334 goto e_inval; 335 np->rxopt.bits.srcrt = valbool; 336 retv = 0; 337 break; 338 339 case IPV6_2292RTHDR: 340 if (optlen < sizeof(int)) 341 goto e_inval; 342 np->rxopt.bits.osrcrt = valbool; 343 retv = 0; 344 break; 345 346 case IPV6_RECVHOPOPTS: 347 if (optlen < sizeof(int)) 348 goto e_inval; 349 np->rxopt.bits.hopopts = valbool; 350 retv = 0; 351 break; 352 353 case IPV6_2292HOPOPTS: 354 if (optlen < sizeof(int)) 355 goto e_inval; 356 np->rxopt.bits.ohopopts = valbool; 357 retv = 0; 358 break; 359 360 case IPV6_RECVDSTOPTS: 361 if (optlen < sizeof(int)) 362 goto e_inval; 363 np->rxopt.bits.dstopts = valbool; 364 retv = 0; 365 break; 366 367 case IPV6_2292DSTOPTS: 368 if (optlen < sizeof(int)) 369 goto e_inval; 370 np->rxopt.bits.odstopts = valbool; 371 retv = 0; 372 break; 373 374 case IPV6_TCLASS: 375 if (optlen < sizeof(int)) 376 goto e_inval; 377 if (val < -1 || val > 0xff) 378 goto e_inval; 379 /* RFC 3542, 6.5: default traffic class of 0x0 */ 380 if (val == -1) 381 val = 0; 382 np->tclass = val; 383 retv = 0; 384 break; 385 386 case IPV6_RECVTCLASS: 387 if (optlen < sizeof(int)) 388 goto e_inval; 389 np->rxopt.bits.rxtclass = valbool; 390 retv = 0; 391 break; 392 393 case IPV6_FLOWINFO: 394 if (optlen < sizeof(int)) 395 goto e_inval; 396 np->rxopt.bits.rxflow = valbool; 397 retv = 0; 398 break; 399 400 case IPV6_RECVPATHMTU: 401 if (optlen < sizeof(int)) 402 goto e_inval; 403 np->rxopt.bits.rxpmtu = valbool; 404 retv = 0; 405 break; 406 407 case IPV6_TRANSPARENT: 408 if (valbool && !ns_capable(net->user_ns, CAP_NET_RAW) && 409 !ns_capable(net->user_ns, CAP_NET_ADMIN)) { 410 retv = -EPERM; 411 break; 412 } 413 if (optlen < sizeof(int)) 414 goto e_inval; 415 /* we don't have a separate transparent bit for IPV6 we use the one in the IPv4 socket */ 416 inet_sk(sk)->transparent = valbool; 417 retv = 0; 418 break; 419 420 case IPV6_FREEBIND: 421 if (optlen < sizeof(int)) 422 goto e_inval; 423 /* we also don't have a separate freebind bit for IPV6 */ 424 inet_sk(sk)->freebind = valbool; 425 retv = 0; 426 break; 427 428 case IPV6_RECVORIGDSTADDR: 429 if (optlen < sizeof(int)) 430 goto e_inval; 431 np->rxopt.bits.rxorigdstaddr = valbool; 432 retv = 0; 433 break; 434 435 case IPV6_HOPOPTS: 436 case IPV6_RTHDRDSTOPTS: 437 case IPV6_RTHDR: 438 case IPV6_DSTOPTS: 439 { 440 struct ipv6_txoptions *opt; 441 struct ipv6_opt_hdr *new = NULL; 442 443 /* hop-by-hop / destination options are privileged option */ 444 retv = -EPERM; 445 if (optname != IPV6_RTHDR && !ns_capable(net->user_ns, CAP_NET_RAW)) 446 break; 447 448 /* remove any sticky options header with a zero option 449 * length, per RFC3542. 450 */ 451 if (optlen == 0) 452 optval = NULL; 453 else if (!optval) 454 goto e_inval; 455 else if (optlen < sizeof(struct ipv6_opt_hdr) || 456 optlen & 0x7 || optlen > 8 * 255) 457 goto e_inval; 458 else { 459 new = memdup_user(optval, optlen); 460 if (IS_ERR(new)) { 461 retv = PTR_ERR(new); 462 break; 463 } 464 if (unlikely(ipv6_optlen(new) > optlen)) { 465 kfree(new); 466 goto e_inval; 467 } 468 } 469 470 opt = rcu_dereference_protected(np->opt, 471 lockdep_sock_is_held(sk)); 472 opt = ipv6_renew_options(sk, opt, optname, new); 473 kfree(new); 474 if (IS_ERR(opt)) { 475 retv = PTR_ERR(opt); 476 break; 477 } 478 479 /* routing header option needs extra check */ 480 retv = -EINVAL; 481 if (optname == IPV6_RTHDR && opt && opt->srcrt) { 482 struct ipv6_rt_hdr *rthdr = opt->srcrt; 483 switch (rthdr->type) { 484 #if IS_ENABLED(CONFIG_IPV6_MIP6) 485 case IPV6_SRCRT_TYPE_2: 486 if (rthdr->hdrlen != 2 || 487 rthdr->segments_left != 1) 488 goto sticky_done; 489 490 break; 491 #endif 492 case IPV6_SRCRT_TYPE_4: 493 { 494 struct ipv6_sr_hdr *srh = (struct ipv6_sr_hdr *) 495 opt->srcrt; 496 497 if (!seg6_validate_srh(srh, optlen, false)) 498 goto sticky_done; 499 break; 500 } 501 default: 502 goto sticky_done; 503 } 504 } 505 506 retv = 0; 507 opt = ipv6_update_options(sk, opt); 508 sticky_done: 509 if (opt) { 510 atomic_sub(opt->tot_len, &sk->sk_omem_alloc); 511 txopt_put(opt); 512 } 513 break; 514 } 515 516 case IPV6_PKTINFO: 517 { 518 struct in6_pktinfo pkt; 519 520 if (optlen == 0) 521 goto e_inval; 522 else if (optlen < sizeof(struct in6_pktinfo) || !optval) 523 goto e_inval; 524 525 if (copy_from_user(&pkt, optval, sizeof(struct in6_pktinfo))) { 526 retv = -EFAULT; 527 break; 528 } 529 if (!sk_dev_equal_l3scope(sk, pkt.ipi6_ifindex)) 530 goto e_inval; 531 532 np->sticky_pktinfo.ipi6_ifindex = pkt.ipi6_ifindex; 533 np->sticky_pktinfo.ipi6_addr = pkt.ipi6_addr; 534 retv = 0; 535 break; 536 } 537 538 case IPV6_2292PKTOPTIONS: 539 { 540 struct ipv6_txoptions *opt = NULL; 541 struct msghdr msg; 542 struct flowi6 fl6; 543 struct ipcm6_cookie ipc6; 544 545 memset(&fl6, 0, sizeof(fl6)); 546 fl6.flowi6_oif = sk->sk_bound_dev_if; 547 fl6.flowi6_mark = sk->sk_mark; 548 549 if (optlen == 0) 550 goto update; 551 552 /* 1K is probably excessive 553 * 1K is surely not enough, 2K per standard header is 16K. 554 */ 555 retv = -EINVAL; 556 if (optlen > 64*1024) 557 break; 558 559 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL); 560 retv = -ENOBUFS; 561 if (!opt) 562 break; 563 564 memset(opt, 0, sizeof(*opt)); 565 refcount_set(&opt->refcnt, 1); 566 opt->tot_len = sizeof(*opt) + optlen; 567 retv = -EFAULT; 568 if (copy_from_user(opt+1, optval, optlen)) 569 goto done; 570 571 msg.msg_controllen = optlen; 572 msg.msg_control = (void *)(opt+1); 573 ipc6.opt = opt; 574 575 retv = ip6_datagram_send_ctl(net, sk, &msg, &fl6, &ipc6); 576 if (retv) 577 goto done; 578 update: 579 retv = 0; 580 opt = ipv6_update_options(sk, opt); 581 done: 582 if (opt) { 583 atomic_sub(opt->tot_len, &sk->sk_omem_alloc); 584 txopt_put(opt); 585 } 586 break; 587 } 588 case IPV6_UNICAST_HOPS: 589 if (optlen < sizeof(int)) 590 goto e_inval; 591 if (val > 255 || val < -1) 592 goto e_inval; 593 np->hop_limit = val; 594 retv = 0; 595 break; 596 597 case IPV6_MULTICAST_HOPS: 598 if (sk->sk_type == SOCK_STREAM) 599 break; 600 if (optlen < sizeof(int)) 601 goto e_inval; 602 if (val > 255 || val < -1) 603 goto e_inval; 604 np->mcast_hops = (val == -1 ? IPV6_DEFAULT_MCASTHOPS : val); 605 retv = 0; 606 break; 607 608 case IPV6_MULTICAST_LOOP: 609 if (optlen < sizeof(int)) 610 goto e_inval; 611 if (val != valbool) 612 goto e_inval; 613 np->mc_loop = valbool; 614 retv = 0; 615 break; 616 617 case IPV6_UNICAST_IF: 618 { 619 struct net_device *dev = NULL; 620 int ifindex; 621 622 if (optlen != sizeof(int)) 623 goto e_inval; 624 625 ifindex = (__force int)ntohl((__force __be32)val); 626 if (ifindex == 0) { 627 np->ucast_oif = 0; 628 retv = 0; 629 break; 630 } 631 632 dev = dev_get_by_index(net, ifindex); 633 retv = -EADDRNOTAVAIL; 634 if (!dev) 635 break; 636 dev_put(dev); 637 638 retv = -EINVAL; 639 if (sk->sk_bound_dev_if) 640 break; 641 642 np->ucast_oif = ifindex; 643 retv = 0; 644 break; 645 } 646 647 case IPV6_MULTICAST_IF: 648 if (sk->sk_type == SOCK_STREAM) 649 break; 650 if (optlen < sizeof(int)) 651 goto e_inval; 652 653 if (val) { 654 struct net_device *dev; 655 int midx; 656 657 rcu_read_lock(); 658 659 dev = dev_get_by_index_rcu(net, val); 660 if (!dev) { 661 rcu_read_unlock(); 662 retv = -ENODEV; 663 break; 664 } 665 midx = l3mdev_master_ifindex_rcu(dev); 666 667 rcu_read_unlock(); 668 669 if (sk->sk_bound_dev_if && 670 sk->sk_bound_dev_if != val && 671 (!midx || midx != sk->sk_bound_dev_if)) 672 goto e_inval; 673 } 674 np->mcast_oif = val; 675 retv = 0; 676 break; 677 case IPV6_ADD_MEMBERSHIP: 678 case IPV6_DROP_MEMBERSHIP: 679 { 680 struct ipv6_mreq mreq; 681 682 if (optlen < sizeof(struct ipv6_mreq)) 683 goto e_inval; 684 685 retv = -EPROTO; 686 if (inet_sk(sk)->is_icsk) 687 break; 688 689 retv = -EFAULT; 690 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq))) 691 break; 692 693 if (optname == IPV6_ADD_MEMBERSHIP) 694 retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr); 695 else 696 retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr); 697 break; 698 } 699 case IPV6_JOIN_ANYCAST: 700 case IPV6_LEAVE_ANYCAST: 701 { 702 struct ipv6_mreq mreq; 703 704 if (optlen < sizeof(struct ipv6_mreq)) 705 goto e_inval; 706 707 retv = -EFAULT; 708 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq))) 709 break; 710 711 if (optname == IPV6_JOIN_ANYCAST) 712 retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr); 713 else 714 retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr); 715 break; 716 } 717 case IPV6_MULTICAST_ALL: 718 if (optlen < sizeof(int)) 719 goto e_inval; 720 np->mc_all = valbool; 721 retv = 0; 722 break; 723 724 case MCAST_JOIN_GROUP: 725 case MCAST_LEAVE_GROUP: 726 { 727 struct group_req greq; 728 struct sockaddr_in6 *psin6; 729 730 if (optlen < sizeof(struct group_req)) 731 goto e_inval; 732 733 retv = -EFAULT; 734 if (copy_from_user(&greq, optval, sizeof(struct group_req))) 735 break; 736 if (greq.gr_group.ss_family != AF_INET6) { 737 retv = -EADDRNOTAVAIL; 738 break; 739 } 740 psin6 = (struct sockaddr_in6 *)&greq.gr_group; 741 if (optname == MCAST_JOIN_GROUP) 742 retv = ipv6_sock_mc_join(sk, greq.gr_interface, 743 &psin6->sin6_addr); 744 else 745 retv = ipv6_sock_mc_drop(sk, greq.gr_interface, 746 &psin6->sin6_addr); 747 break; 748 } 749 case MCAST_JOIN_SOURCE_GROUP: 750 case MCAST_LEAVE_SOURCE_GROUP: 751 case MCAST_BLOCK_SOURCE: 752 case MCAST_UNBLOCK_SOURCE: 753 { 754 struct group_source_req greqs; 755 756 if (optlen < sizeof(struct group_source_req)) 757 goto e_inval; 758 if (copy_from_user(&greqs, optval, sizeof(greqs))) { 759 retv = -EFAULT; 760 break; 761 } 762 retv = do_ipv6_mcast_group_source(sk, optname, &greqs); 763 break; 764 } 765 case MCAST_MSFILTER: 766 { 767 struct group_filter *gsf; 768 769 if (optlen < GROUP_FILTER_SIZE(0)) 770 goto e_inval; 771 if (optlen > sysctl_optmem_max) { 772 retv = -ENOBUFS; 773 break; 774 } 775 gsf = memdup_user(optval, optlen); 776 if (IS_ERR(gsf)) { 777 retv = PTR_ERR(gsf); 778 break; 779 } 780 /* numsrc >= (4G-140)/128 overflow in 32 bits */ 781 if (gsf->gf_numsrc >= 0x1ffffffU || 782 gsf->gf_numsrc > sysctl_mld_max_msf) { 783 kfree(gsf); 784 retv = -ENOBUFS; 785 break; 786 } 787 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) { 788 kfree(gsf); 789 retv = -EINVAL; 790 break; 791 } 792 retv = ip6_mc_msfilter(sk, gsf, gsf->gf_slist); 793 kfree(gsf); 794 795 break; 796 } 797 case IPV6_ROUTER_ALERT: 798 if (optlen < sizeof(int)) 799 goto e_inval; 800 retv = ip6_ra_control(sk, val); 801 break; 802 case IPV6_ROUTER_ALERT_ISOLATE: 803 if (optlen < sizeof(int)) 804 goto e_inval; 805 np->rtalert_isolate = valbool; 806 retv = 0; 807 break; 808 case IPV6_MTU_DISCOVER: 809 if (optlen < sizeof(int)) 810 goto e_inval; 811 if (val < IPV6_PMTUDISC_DONT || val > IPV6_PMTUDISC_OMIT) 812 goto e_inval; 813 np->pmtudisc = val; 814 retv = 0; 815 break; 816 case IPV6_MTU: 817 if (optlen < sizeof(int)) 818 goto e_inval; 819 if (val && val < IPV6_MIN_MTU) 820 goto e_inval; 821 np->frag_size = val; 822 retv = 0; 823 break; 824 case IPV6_RECVERR: 825 if (optlen < sizeof(int)) 826 goto e_inval; 827 np->recverr = valbool; 828 if (!val) 829 skb_queue_purge(&sk->sk_error_queue); 830 retv = 0; 831 break; 832 case IPV6_FLOWINFO_SEND: 833 if (optlen < sizeof(int)) 834 goto e_inval; 835 np->sndflow = valbool; 836 retv = 0; 837 break; 838 case IPV6_FLOWLABEL_MGR: 839 retv = ipv6_flowlabel_opt(sk, optval, optlen); 840 break; 841 case IPV6_IPSEC_POLICY: 842 case IPV6_XFRM_POLICY: 843 retv = -EPERM; 844 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 845 break; 846 retv = xfrm_user_policy(sk, optname, optval, optlen); 847 break; 848 849 case IPV6_ADDR_PREFERENCES: 850 if (optlen < sizeof(int)) 851 goto e_inval; 852 retv = __ip6_sock_set_addr_preferences(sk, val); 853 break; 854 case IPV6_MINHOPCOUNT: 855 if (optlen < sizeof(int)) 856 goto e_inval; 857 if (val < 0 || val > 255) 858 goto e_inval; 859 np->min_hopcount = val; 860 retv = 0; 861 break; 862 case IPV6_DONTFRAG: 863 np->dontfrag = valbool; 864 retv = 0; 865 break; 866 case IPV6_AUTOFLOWLABEL: 867 np->autoflowlabel = valbool; 868 np->autoflowlabel_set = 1; 869 retv = 0; 870 break; 871 case IPV6_RECVFRAGSIZE: 872 np->rxopt.bits.recvfragsize = valbool; 873 retv = 0; 874 break; 875 } 876 877 release_sock(sk); 878 if (needs_rtnl) 879 rtnl_unlock(); 880 881 return retv; 882 883 e_inval: 884 release_sock(sk); 885 if (needs_rtnl) 886 rtnl_unlock(); 887 return -EINVAL; 888 } 889 890 int ipv6_setsockopt(struct sock *sk, int level, int optname, 891 char __user *optval, unsigned int optlen) 892 { 893 int err; 894 895 if (level == SOL_IP && sk->sk_type != SOCK_RAW) 896 return udp_prot.setsockopt(sk, level, optname, optval, optlen); 897 898 if (level != SOL_IPV6) 899 return -ENOPROTOOPT; 900 901 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen); 902 #ifdef CONFIG_NETFILTER 903 /* we need to exclude all possible ENOPROTOOPTs except default case */ 904 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY && 905 optname != IPV6_XFRM_POLICY) 906 err = nf_setsockopt(sk, PF_INET6, optname, optval, optlen); 907 #endif 908 return err; 909 } 910 EXPORT_SYMBOL(ipv6_setsockopt); 911 912 #ifdef CONFIG_COMPAT 913 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname, 914 char __user *optval, unsigned int optlen) 915 { 916 int err; 917 918 if (level == SOL_IP && sk->sk_type != SOCK_RAW) { 919 if (udp_prot.compat_setsockopt != NULL) 920 return udp_prot.compat_setsockopt(sk, level, optname, 921 optval, optlen); 922 return udp_prot.setsockopt(sk, level, optname, optval, optlen); 923 } 924 925 if (level != SOL_IPV6) 926 return -ENOPROTOOPT; 927 928 switch (optname) { 929 case MCAST_JOIN_GROUP: 930 case MCAST_LEAVE_GROUP: 931 { 932 struct compat_group_req __user *gr32 = (void __user *)optval; 933 struct group_req greq; 934 struct sockaddr_in6 *psin6 = (struct sockaddr_in6 *)&greq.gr_group; 935 936 if (optlen < sizeof(struct compat_group_req)) 937 return -EINVAL; 938 939 if (get_user(greq.gr_interface, &gr32->gr_interface) || 940 copy_from_user(&greq.gr_group, &gr32->gr_group, 941 sizeof(greq.gr_group))) 942 return -EFAULT; 943 944 if (greq.gr_group.ss_family != AF_INET6) 945 return -EADDRNOTAVAIL; 946 947 rtnl_lock(); 948 lock_sock(sk); 949 if (optname == MCAST_JOIN_GROUP) 950 err = ipv6_sock_mc_join(sk, greq.gr_interface, 951 &psin6->sin6_addr); 952 else 953 err = ipv6_sock_mc_drop(sk, greq.gr_interface, 954 &psin6->sin6_addr); 955 release_sock(sk); 956 rtnl_unlock(); 957 return err; 958 } 959 case MCAST_JOIN_SOURCE_GROUP: 960 case MCAST_LEAVE_SOURCE_GROUP: 961 case MCAST_BLOCK_SOURCE: 962 case MCAST_UNBLOCK_SOURCE: 963 { 964 struct compat_group_source_req __user *gsr32 = (void __user *)optval; 965 struct group_source_req greqs; 966 967 if (optlen < sizeof(struct compat_group_source_req)) 968 return -EINVAL; 969 970 if (get_user(greqs.gsr_interface, &gsr32->gsr_interface) || 971 copy_from_user(&greqs.gsr_group, &gsr32->gsr_group, 972 sizeof(greqs.gsr_group)) || 973 copy_from_user(&greqs.gsr_source, &gsr32->gsr_source, 974 sizeof(greqs.gsr_source))) 975 return -EFAULT; 976 977 rtnl_lock(); 978 lock_sock(sk); 979 err = do_ipv6_mcast_group_source(sk, optname, &greqs); 980 release_sock(sk); 981 rtnl_unlock(); 982 return err; 983 } 984 case MCAST_MSFILTER: 985 { 986 const int size0 = offsetof(struct compat_group_filter, gf_slist); 987 struct compat_group_filter *gf32; 988 void *p; 989 int n; 990 991 if (optlen < size0) 992 return -EINVAL; 993 if (optlen > sysctl_optmem_max - 4) 994 return -ENOBUFS; 995 996 p = kmalloc(optlen + 4, GFP_KERNEL); 997 if (!p) 998 return -ENOMEM; 999 1000 gf32 = p + 4; /* we want ->gf_group and ->gf_slist aligned */ 1001 if (copy_from_user(gf32, optval, optlen)) { 1002 err = -EFAULT; 1003 goto mc_msf_out; 1004 } 1005 1006 n = gf32->gf_numsrc; 1007 /* numsrc >= (4G-140)/128 overflow in 32 bits */ 1008 if (n >= 0x1ffffffU || 1009 n > sysctl_mld_max_msf) { 1010 err = -ENOBUFS; 1011 goto mc_msf_out; 1012 } 1013 if (offsetof(struct compat_group_filter, gf_slist[n]) > optlen) { 1014 err = -EINVAL; 1015 goto mc_msf_out; 1016 } 1017 1018 rtnl_lock(); 1019 lock_sock(sk); 1020 err = ip6_mc_msfilter(sk, &(struct group_filter){ 1021 .gf_interface = gf32->gf_interface, 1022 .gf_group = gf32->gf_group, 1023 .gf_fmode = gf32->gf_fmode, 1024 .gf_numsrc = gf32->gf_numsrc}, gf32->gf_slist); 1025 release_sock(sk); 1026 rtnl_unlock(); 1027 mc_msf_out: 1028 kfree(p); 1029 return err; 1030 } 1031 } 1032 1033 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen); 1034 #ifdef CONFIG_NETFILTER 1035 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1036 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY && 1037 optname != IPV6_XFRM_POLICY) 1038 err = compat_nf_setsockopt(sk, PF_INET6, optname, optval, 1039 optlen); 1040 #endif 1041 return err; 1042 } 1043 EXPORT_SYMBOL(compat_ipv6_setsockopt); 1044 #endif 1045 1046 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt, 1047 int optname, char __user *optval, int len) 1048 { 1049 struct ipv6_opt_hdr *hdr; 1050 1051 if (!opt) 1052 return 0; 1053 1054 switch (optname) { 1055 case IPV6_HOPOPTS: 1056 hdr = opt->hopopt; 1057 break; 1058 case IPV6_RTHDRDSTOPTS: 1059 hdr = opt->dst0opt; 1060 break; 1061 case IPV6_RTHDR: 1062 hdr = (struct ipv6_opt_hdr *)opt->srcrt; 1063 break; 1064 case IPV6_DSTOPTS: 1065 hdr = opt->dst1opt; 1066 break; 1067 default: 1068 return -EINVAL; /* should not happen */ 1069 } 1070 1071 if (!hdr) 1072 return 0; 1073 1074 len = min_t(unsigned int, len, ipv6_optlen(hdr)); 1075 if (copy_to_user(optval, hdr, len)) 1076 return -EFAULT; 1077 return len; 1078 } 1079 1080 static int do_ipv6_getsockopt(struct sock *sk, int level, int optname, 1081 char __user *optval, int __user *optlen, unsigned int flags) 1082 { 1083 struct ipv6_pinfo *np = inet6_sk(sk); 1084 int len; 1085 int val; 1086 1087 if (ip6_mroute_opt(optname)) 1088 return ip6_mroute_getsockopt(sk, optname, optval, optlen); 1089 1090 if (get_user(len, optlen)) 1091 return -EFAULT; 1092 switch (optname) { 1093 case IPV6_ADDRFORM: 1094 if (sk->sk_protocol != IPPROTO_UDP && 1095 sk->sk_protocol != IPPROTO_UDPLITE && 1096 sk->sk_protocol != IPPROTO_TCP) 1097 return -ENOPROTOOPT; 1098 if (sk->sk_state != TCP_ESTABLISHED) 1099 return -ENOTCONN; 1100 val = sk->sk_family; 1101 break; 1102 case MCAST_MSFILTER: 1103 { 1104 struct group_filter __user *p = (void __user *)optval; 1105 struct group_filter gsf; 1106 const int size0 = offsetof(struct group_filter, gf_slist); 1107 int num; 1108 int err; 1109 1110 if (len < size0) 1111 return -EINVAL; 1112 if (copy_from_user(&gsf, p, size0)) 1113 return -EFAULT; 1114 if (gsf.gf_group.ss_family != AF_INET6) 1115 return -EADDRNOTAVAIL; 1116 num = gsf.gf_numsrc; 1117 lock_sock(sk); 1118 err = ip6_mc_msfget(sk, &gsf, p->gf_slist); 1119 if (!err) { 1120 if (num > gsf.gf_numsrc) 1121 num = gsf.gf_numsrc; 1122 if (put_user(GROUP_FILTER_SIZE(num), optlen) || 1123 copy_to_user(p, &gsf, size0)) 1124 err = -EFAULT; 1125 } 1126 release_sock(sk); 1127 return err; 1128 } 1129 1130 case IPV6_2292PKTOPTIONS: 1131 { 1132 struct msghdr msg; 1133 struct sk_buff *skb; 1134 1135 if (sk->sk_type != SOCK_STREAM) 1136 return -ENOPROTOOPT; 1137 1138 msg.msg_control = optval; 1139 msg.msg_controllen = len; 1140 msg.msg_flags = flags; 1141 msg.msg_control_is_user = true; 1142 1143 lock_sock(sk); 1144 skb = np->pktoptions; 1145 if (skb) 1146 ip6_datagram_recv_ctl(sk, &msg, skb); 1147 release_sock(sk); 1148 if (!skb) { 1149 if (np->rxopt.bits.rxinfo) { 1150 struct in6_pktinfo src_info; 1151 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif : 1152 np->sticky_pktinfo.ipi6_ifindex; 1153 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr : np->sticky_pktinfo.ipi6_addr; 1154 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info); 1155 } 1156 if (np->rxopt.bits.rxhlim) { 1157 int hlim = np->mcast_hops; 1158 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim); 1159 } 1160 if (np->rxopt.bits.rxtclass) { 1161 int tclass = (int)ip6_tclass(np->rcv_flowinfo); 1162 1163 put_cmsg(&msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass); 1164 } 1165 if (np->rxopt.bits.rxoinfo) { 1166 struct in6_pktinfo src_info; 1167 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif : 1168 np->sticky_pktinfo.ipi6_ifindex; 1169 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr : 1170 np->sticky_pktinfo.ipi6_addr; 1171 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info); 1172 } 1173 if (np->rxopt.bits.rxohlim) { 1174 int hlim = np->mcast_hops; 1175 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim); 1176 } 1177 if (np->rxopt.bits.rxflow) { 1178 __be32 flowinfo = np->rcv_flowinfo; 1179 1180 put_cmsg(&msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo); 1181 } 1182 } 1183 len -= msg.msg_controllen; 1184 return put_user(len, optlen); 1185 } 1186 case IPV6_MTU: 1187 { 1188 struct dst_entry *dst; 1189 1190 val = 0; 1191 rcu_read_lock(); 1192 dst = __sk_dst_get(sk); 1193 if (dst) 1194 val = dst_mtu(dst); 1195 rcu_read_unlock(); 1196 if (!val) 1197 return -ENOTCONN; 1198 break; 1199 } 1200 1201 case IPV6_V6ONLY: 1202 val = sk->sk_ipv6only; 1203 break; 1204 1205 case IPV6_RECVPKTINFO: 1206 val = np->rxopt.bits.rxinfo; 1207 break; 1208 1209 case IPV6_2292PKTINFO: 1210 val = np->rxopt.bits.rxoinfo; 1211 break; 1212 1213 case IPV6_RECVHOPLIMIT: 1214 val = np->rxopt.bits.rxhlim; 1215 break; 1216 1217 case IPV6_2292HOPLIMIT: 1218 val = np->rxopt.bits.rxohlim; 1219 break; 1220 1221 case IPV6_RECVRTHDR: 1222 val = np->rxopt.bits.srcrt; 1223 break; 1224 1225 case IPV6_2292RTHDR: 1226 val = np->rxopt.bits.osrcrt; 1227 break; 1228 1229 case IPV6_HOPOPTS: 1230 case IPV6_RTHDRDSTOPTS: 1231 case IPV6_RTHDR: 1232 case IPV6_DSTOPTS: 1233 { 1234 struct ipv6_txoptions *opt; 1235 1236 lock_sock(sk); 1237 opt = rcu_dereference_protected(np->opt, 1238 lockdep_sock_is_held(sk)); 1239 len = ipv6_getsockopt_sticky(sk, opt, optname, optval, len); 1240 release_sock(sk); 1241 /* check if ipv6_getsockopt_sticky() returns err code */ 1242 if (len < 0) 1243 return len; 1244 return put_user(len, optlen); 1245 } 1246 1247 case IPV6_RECVHOPOPTS: 1248 val = np->rxopt.bits.hopopts; 1249 break; 1250 1251 case IPV6_2292HOPOPTS: 1252 val = np->rxopt.bits.ohopopts; 1253 break; 1254 1255 case IPV6_RECVDSTOPTS: 1256 val = np->rxopt.bits.dstopts; 1257 break; 1258 1259 case IPV6_2292DSTOPTS: 1260 val = np->rxopt.bits.odstopts; 1261 break; 1262 1263 case IPV6_TCLASS: 1264 val = np->tclass; 1265 break; 1266 1267 case IPV6_RECVTCLASS: 1268 val = np->rxopt.bits.rxtclass; 1269 break; 1270 1271 case IPV6_FLOWINFO: 1272 val = np->rxopt.bits.rxflow; 1273 break; 1274 1275 case IPV6_RECVPATHMTU: 1276 val = np->rxopt.bits.rxpmtu; 1277 break; 1278 1279 case IPV6_PATHMTU: 1280 { 1281 struct dst_entry *dst; 1282 struct ip6_mtuinfo mtuinfo; 1283 1284 if (len < sizeof(mtuinfo)) 1285 return -EINVAL; 1286 1287 len = sizeof(mtuinfo); 1288 memset(&mtuinfo, 0, sizeof(mtuinfo)); 1289 1290 rcu_read_lock(); 1291 dst = __sk_dst_get(sk); 1292 if (dst) 1293 mtuinfo.ip6m_mtu = dst_mtu(dst); 1294 rcu_read_unlock(); 1295 if (!mtuinfo.ip6m_mtu) 1296 return -ENOTCONN; 1297 1298 if (put_user(len, optlen)) 1299 return -EFAULT; 1300 if (copy_to_user(optval, &mtuinfo, len)) 1301 return -EFAULT; 1302 1303 return 0; 1304 } 1305 1306 case IPV6_TRANSPARENT: 1307 val = inet_sk(sk)->transparent; 1308 break; 1309 1310 case IPV6_FREEBIND: 1311 val = inet_sk(sk)->freebind; 1312 break; 1313 1314 case IPV6_RECVORIGDSTADDR: 1315 val = np->rxopt.bits.rxorigdstaddr; 1316 break; 1317 1318 case IPV6_UNICAST_HOPS: 1319 case IPV6_MULTICAST_HOPS: 1320 { 1321 struct dst_entry *dst; 1322 1323 if (optname == IPV6_UNICAST_HOPS) 1324 val = np->hop_limit; 1325 else 1326 val = np->mcast_hops; 1327 1328 if (val < 0) { 1329 rcu_read_lock(); 1330 dst = __sk_dst_get(sk); 1331 if (dst) 1332 val = ip6_dst_hoplimit(dst); 1333 rcu_read_unlock(); 1334 } 1335 1336 if (val < 0) 1337 val = sock_net(sk)->ipv6.devconf_all->hop_limit; 1338 break; 1339 } 1340 1341 case IPV6_MULTICAST_LOOP: 1342 val = np->mc_loop; 1343 break; 1344 1345 case IPV6_MULTICAST_IF: 1346 val = np->mcast_oif; 1347 break; 1348 1349 case IPV6_MULTICAST_ALL: 1350 val = np->mc_all; 1351 break; 1352 1353 case IPV6_UNICAST_IF: 1354 val = (__force int)htonl((__u32) np->ucast_oif); 1355 break; 1356 1357 case IPV6_MTU_DISCOVER: 1358 val = np->pmtudisc; 1359 break; 1360 1361 case IPV6_RECVERR: 1362 val = np->recverr; 1363 break; 1364 1365 case IPV6_FLOWINFO_SEND: 1366 val = np->sndflow; 1367 break; 1368 1369 case IPV6_FLOWLABEL_MGR: 1370 { 1371 struct in6_flowlabel_req freq; 1372 int flags; 1373 1374 if (len < sizeof(freq)) 1375 return -EINVAL; 1376 1377 if (copy_from_user(&freq, optval, sizeof(freq))) 1378 return -EFAULT; 1379 1380 if (freq.flr_action != IPV6_FL_A_GET) 1381 return -EINVAL; 1382 1383 len = sizeof(freq); 1384 flags = freq.flr_flags; 1385 1386 memset(&freq, 0, sizeof(freq)); 1387 1388 val = ipv6_flowlabel_opt_get(sk, &freq, flags); 1389 if (val < 0) 1390 return val; 1391 1392 if (put_user(len, optlen)) 1393 return -EFAULT; 1394 if (copy_to_user(optval, &freq, len)) 1395 return -EFAULT; 1396 1397 return 0; 1398 } 1399 1400 case IPV6_ADDR_PREFERENCES: 1401 val = 0; 1402 1403 if (np->srcprefs & IPV6_PREFER_SRC_TMP) 1404 val |= IPV6_PREFER_SRC_TMP; 1405 else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC) 1406 val |= IPV6_PREFER_SRC_PUBLIC; 1407 else { 1408 /* XXX: should we return system default? */ 1409 val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT; 1410 } 1411 1412 if (np->srcprefs & IPV6_PREFER_SRC_COA) 1413 val |= IPV6_PREFER_SRC_COA; 1414 else 1415 val |= IPV6_PREFER_SRC_HOME; 1416 break; 1417 1418 case IPV6_MINHOPCOUNT: 1419 val = np->min_hopcount; 1420 break; 1421 1422 case IPV6_DONTFRAG: 1423 val = np->dontfrag; 1424 break; 1425 1426 case IPV6_AUTOFLOWLABEL: 1427 val = ip6_autoflowlabel(sock_net(sk), np); 1428 break; 1429 1430 case IPV6_RECVFRAGSIZE: 1431 val = np->rxopt.bits.recvfragsize; 1432 break; 1433 1434 case IPV6_ROUTER_ALERT_ISOLATE: 1435 val = np->rtalert_isolate; 1436 break; 1437 1438 default: 1439 return -ENOPROTOOPT; 1440 } 1441 len = min_t(unsigned int, sizeof(int), len); 1442 if (put_user(len, optlen)) 1443 return -EFAULT; 1444 if (copy_to_user(optval, &val, len)) 1445 return -EFAULT; 1446 return 0; 1447 } 1448 1449 int ipv6_getsockopt(struct sock *sk, int level, int optname, 1450 char __user *optval, int __user *optlen) 1451 { 1452 int err; 1453 1454 if (level == SOL_IP && sk->sk_type != SOCK_RAW) 1455 return udp_prot.getsockopt(sk, level, optname, optval, optlen); 1456 1457 if (level != SOL_IPV6) 1458 return -ENOPROTOOPT; 1459 1460 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen, 0); 1461 #ifdef CONFIG_NETFILTER 1462 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1463 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) { 1464 int len; 1465 1466 if (get_user(len, optlen)) 1467 return -EFAULT; 1468 1469 err = nf_getsockopt(sk, PF_INET6, optname, optval, &len); 1470 if (err >= 0) 1471 err = put_user(len, optlen); 1472 } 1473 #endif 1474 return err; 1475 } 1476 EXPORT_SYMBOL(ipv6_getsockopt); 1477 1478 #ifdef CONFIG_COMPAT 1479 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname, 1480 char __user *optval, int __user *optlen) 1481 { 1482 int err; 1483 1484 if (level == SOL_IP && sk->sk_type != SOCK_RAW) { 1485 if (udp_prot.compat_getsockopt != NULL) 1486 return udp_prot.compat_getsockopt(sk, level, optname, 1487 optval, optlen); 1488 return udp_prot.getsockopt(sk, level, optname, optval, optlen); 1489 } 1490 1491 if (level != SOL_IPV6) 1492 return -ENOPROTOOPT; 1493 1494 if (optname == MCAST_MSFILTER) { 1495 const int size0 = offsetof(struct compat_group_filter, gf_slist); 1496 struct compat_group_filter __user *p = (void __user *)optval; 1497 struct compat_group_filter gf32; 1498 struct group_filter gf; 1499 int ulen, err; 1500 int num; 1501 1502 if (get_user(ulen, optlen)) 1503 return -EFAULT; 1504 1505 if (ulen < size0) 1506 return -EINVAL; 1507 1508 if (copy_from_user(&gf32, p, size0)) 1509 return -EFAULT; 1510 1511 gf.gf_interface = gf32.gf_interface; 1512 gf.gf_fmode = gf32.gf_fmode; 1513 num = gf.gf_numsrc = gf32.gf_numsrc; 1514 gf.gf_group = gf32.gf_group; 1515 1516 if (gf.gf_group.ss_family != AF_INET6) 1517 return -EADDRNOTAVAIL; 1518 lock_sock(sk); 1519 err = ip6_mc_msfget(sk, &gf, p->gf_slist); 1520 release_sock(sk); 1521 if (err) 1522 return err; 1523 if (num > gf.gf_numsrc) 1524 num = gf.gf_numsrc; 1525 ulen = GROUP_FILTER_SIZE(num) - (sizeof(gf)-sizeof(gf32)); 1526 if (put_user(ulen, optlen) || 1527 put_user(gf.gf_fmode, &p->gf_fmode) || 1528 put_user(gf.gf_numsrc, &p->gf_numsrc)) 1529 return -EFAULT; 1530 return 0; 1531 } 1532 1533 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen, 1534 MSG_CMSG_COMPAT); 1535 #ifdef CONFIG_NETFILTER 1536 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1537 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) { 1538 int len; 1539 1540 if (get_user(len, optlen)) 1541 return -EFAULT; 1542 1543 err = compat_nf_getsockopt(sk, PF_INET6, optname, optval, &len); 1544 if (err >= 0) 1545 err = put_user(len, optlen); 1546 } 1547 #endif 1548 return err; 1549 } 1550 EXPORT_SYMBOL(compat_ipv6_getsockopt); 1551 #endif 1552