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; 598 599 if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != val) 600 goto e_inval; 601 602 dev = dev_get_by_index(net, val); 603 if (!dev) { 604 retv = -ENODEV; 605 break; 606 } 607 dev_put(dev); 608 } 609 np->mcast_oif = val; 610 retv = 0; 611 break; 612 case IPV6_ADD_MEMBERSHIP: 613 case IPV6_DROP_MEMBERSHIP: 614 { 615 struct ipv6_mreq mreq; 616 617 if (optlen < sizeof(struct ipv6_mreq)) 618 goto e_inval; 619 620 retv = -EPROTO; 621 if (inet_sk(sk)->is_icsk) 622 break; 623 624 retv = -EFAULT; 625 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq))) 626 break; 627 628 if (optname == IPV6_ADD_MEMBERSHIP) 629 retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr); 630 else 631 retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr); 632 break; 633 } 634 case IPV6_JOIN_ANYCAST: 635 case IPV6_LEAVE_ANYCAST: 636 { 637 struct ipv6_mreq mreq; 638 639 if (optlen < sizeof(struct ipv6_mreq)) 640 goto e_inval; 641 642 retv = -EFAULT; 643 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq))) 644 break; 645 646 if (optname == IPV6_JOIN_ANYCAST) 647 retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr); 648 else 649 retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr); 650 break; 651 } 652 case MCAST_JOIN_GROUP: 653 case MCAST_LEAVE_GROUP: 654 { 655 struct group_req greq; 656 struct sockaddr_in6 *psin6; 657 658 if (optlen < sizeof(struct group_req)) 659 goto e_inval; 660 661 retv = -EFAULT; 662 if (copy_from_user(&greq, optval, sizeof(struct group_req))) 663 break; 664 if (greq.gr_group.ss_family != AF_INET6) { 665 retv = -EADDRNOTAVAIL; 666 break; 667 } 668 psin6 = (struct sockaddr_in6 *)&greq.gr_group; 669 if (optname == MCAST_JOIN_GROUP) 670 retv = ipv6_sock_mc_join(sk, greq.gr_interface, 671 &psin6->sin6_addr); 672 else 673 retv = ipv6_sock_mc_drop(sk, greq.gr_interface, 674 &psin6->sin6_addr); 675 break; 676 } 677 case MCAST_JOIN_SOURCE_GROUP: 678 case MCAST_LEAVE_SOURCE_GROUP: 679 case MCAST_BLOCK_SOURCE: 680 case MCAST_UNBLOCK_SOURCE: 681 { 682 struct group_source_req greqs; 683 int omode, add; 684 685 if (optlen < sizeof(struct group_source_req)) 686 goto e_inval; 687 if (copy_from_user(&greqs, optval, sizeof(greqs))) { 688 retv = -EFAULT; 689 break; 690 } 691 if (greqs.gsr_group.ss_family != AF_INET6 || 692 greqs.gsr_source.ss_family != AF_INET6) { 693 retv = -EADDRNOTAVAIL; 694 break; 695 } 696 if (optname == MCAST_BLOCK_SOURCE) { 697 omode = MCAST_EXCLUDE; 698 add = 1; 699 } else if (optname == MCAST_UNBLOCK_SOURCE) { 700 omode = MCAST_EXCLUDE; 701 add = 0; 702 } else if (optname == MCAST_JOIN_SOURCE_GROUP) { 703 struct sockaddr_in6 *psin6; 704 705 psin6 = (struct sockaddr_in6 *)&greqs.gsr_group; 706 retv = ipv6_sock_mc_join(sk, greqs.gsr_interface, 707 &psin6->sin6_addr); 708 /* prior join w/ different source is ok */ 709 if (retv && retv != -EADDRINUSE) 710 break; 711 omode = MCAST_INCLUDE; 712 add = 1; 713 } else /* MCAST_LEAVE_SOURCE_GROUP */ { 714 omode = MCAST_INCLUDE; 715 add = 0; 716 } 717 retv = ip6_mc_source(add, omode, sk, &greqs); 718 break; 719 } 720 case MCAST_MSFILTER: 721 { 722 struct group_filter *gsf; 723 724 if (optlen < GROUP_FILTER_SIZE(0)) 725 goto e_inval; 726 if (optlen > sysctl_optmem_max) { 727 retv = -ENOBUFS; 728 break; 729 } 730 gsf = kmalloc(optlen, GFP_KERNEL); 731 if (!gsf) { 732 retv = -ENOBUFS; 733 break; 734 } 735 retv = -EFAULT; 736 if (copy_from_user(gsf, optval, optlen)) { 737 kfree(gsf); 738 break; 739 } 740 /* numsrc >= (4G-140)/128 overflow in 32 bits */ 741 if (gsf->gf_numsrc >= 0x1ffffffU || 742 gsf->gf_numsrc > sysctl_mld_max_msf) { 743 kfree(gsf); 744 retv = -ENOBUFS; 745 break; 746 } 747 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) { 748 kfree(gsf); 749 retv = -EINVAL; 750 break; 751 } 752 retv = ip6_mc_msfilter(sk, gsf); 753 kfree(gsf); 754 755 break; 756 } 757 case IPV6_ROUTER_ALERT: 758 if (optlen < sizeof(int)) 759 goto e_inval; 760 retv = ip6_ra_control(sk, val); 761 break; 762 case IPV6_MTU_DISCOVER: 763 if (optlen < sizeof(int)) 764 goto e_inval; 765 if (val < IPV6_PMTUDISC_DONT || val > IPV6_PMTUDISC_OMIT) 766 goto e_inval; 767 np->pmtudisc = val; 768 retv = 0; 769 break; 770 case IPV6_MTU: 771 if (optlen < sizeof(int)) 772 goto e_inval; 773 if (val && val < IPV6_MIN_MTU) 774 goto e_inval; 775 np->frag_size = val; 776 retv = 0; 777 break; 778 case IPV6_RECVERR: 779 if (optlen < sizeof(int)) 780 goto e_inval; 781 np->recverr = valbool; 782 if (!val) 783 skb_queue_purge(&sk->sk_error_queue); 784 retv = 0; 785 break; 786 case IPV6_FLOWINFO_SEND: 787 if (optlen < sizeof(int)) 788 goto e_inval; 789 np->sndflow = valbool; 790 retv = 0; 791 break; 792 case IPV6_FLOWLABEL_MGR: 793 retv = ipv6_flowlabel_opt(sk, optval, optlen); 794 break; 795 case IPV6_IPSEC_POLICY: 796 case IPV6_XFRM_POLICY: 797 retv = -EPERM; 798 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 799 break; 800 retv = xfrm_user_policy(sk, optname, optval, optlen); 801 break; 802 803 case IPV6_ADDR_PREFERENCES: 804 { 805 unsigned int pref = 0; 806 unsigned int prefmask = ~0; 807 808 if (optlen < sizeof(int)) 809 goto e_inval; 810 811 retv = -EINVAL; 812 813 /* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */ 814 switch (val & (IPV6_PREFER_SRC_PUBLIC| 815 IPV6_PREFER_SRC_TMP| 816 IPV6_PREFER_SRC_PUBTMP_DEFAULT)) { 817 case IPV6_PREFER_SRC_PUBLIC: 818 pref |= IPV6_PREFER_SRC_PUBLIC; 819 break; 820 case IPV6_PREFER_SRC_TMP: 821 pref |= IPV6_PREFER_SRC_TMP; 822 break; 823 case IPV6_PREFER_SRC_PUBTMP_DEFAULT: 824 break; 825 case 0: 826 goto pref_skip_pubtmp; 827 default: 828 goto e_inval; 829 } 830 831 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC| 832 IPV6_PREFER_SRC_TMP); 833 pref_skip_pubtmp: 834 835 /* check HOME/COA conflicts */ 836 switch (val & (IPV6_PREFER_SRC_HOME|IPV6_PREFER_SRC_COA)) { 837 case IPV6_PREFER_SRC_HOME: 838 break; 839 case IPV6_PREFER_SRC_COA: 840 pref |= IPV6_PREFER_SRC_COA; 841 case 0: 842 goto pref_skip_coa; 843 default: 844 goto e_inval; 845 } 846 847 prefmask &= ~IPV6_PREFER_SRC_COA; 848 pref_skip_coa: 849 850 /* check CGA/NONCGA conflicts */ 851 switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) { 852 case IPV6_PREFER_SRC_CGA: 853 case IPV6_PREFER_SRC_NONCGA: 854 case 0: 855 break; 856 default: 857 goto e_inval; 858 } 859 860 np->srcprefs = (np->srcprefs & prefmask) | pref; 861 retv = 0; 862 863 break; 864 } 865 case IPV6_MINHOPCOUNT: 866 if (optlen < sizeof(int)) 867 goto e_inval; 868 if (val < 0 || val > 255) 869 goto e_inval; 870 np->min_hopcount = val; 871 retv = 0; 872 break; 873 case IPV6_DONTFRAG: 874 np->dontfrag = valbool; 875 retv = 0; 876 break; 877 case IPV6_AUTOFLOWLABEL: 878 np->autoflowlabel = valbool; 879 retv = 0; 880 break; 881 case IPV6_RECVFRAGSIZE: 882 np->rxopt.bits.recvfragsize = valbool; 883 retv = 0; 884 break; 885 } 886 887 release_sock(sk); 888 if (needs_rtnl) 889 rtnl_unlock(); 890 891 return retv; 892 893 e_inval: 894 release_sock(sk); 895 if (needs_rtnl) 896 rtnl_unlock(); 897 return -EINVAL; 898 } 899 900 int ipv6_setsockopt(struct sock *sk, int level, int optname, 901 char __user *optval, unsigned int optlen) 902 { 903 int err; 904 905 if (level == SOL_IP && sk->sk_type != SOCK_RAW) 906 return udp_prot.setsockopt(sk, level, optname, optval, optlen); 907 908 if (level != SOL_IPV6) 909 return -ENOPROTOOPT; 910 911 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen); 912 #ifdef CONFIG_NETFILTER 913 /* we need to exclude all possible ENOPROTOOPTs except default case */ 914 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY && 915 optname != IPV6_XFRM_POLICY) { 916 lock_sock(sk); 917 err = nf_setsockopt(sk, PF_INET6, optname, optval, 918 optlen); 919 release_sock(sk); 920 } 921 #endif 922 return err; 923 } 924 EXPORT_SYMBOL(ipv6_setsockopt); 925 926 #ifdef CONFIG_COMPAT 927 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname, 928 char __user *optval, unsigned int optlen) 929 { 930 int err; 931 932 if (level == SOL_IP && sk->sk_type != SOCK_RAW) { 933 if (udp_prot.compat_setsockopt != NULL) 934 return udp_prot.compat_setsockopt(sk, level, optname, 935 optval, optlen); 936 return udp_prot.setsockopt(sk, level, optname, optval, optlen); 937 } 938 939 if (level != SOL_IPV6) 940 return -ENOPROTOOPT; 941 942 if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER) 943 return compat_mc_setsockopt(sk, level, optname, optval, optlen, 944 ipv6_setsockopt); 945 946 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen); 947 #ifdef CONFIG_NETFILTER 948 /* we need to exclude all possible ENOPROTOOPTs except default case */ 949 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY && 950 optname != IPV6_XFRM_POLICY) { 951 lock_sock(sk); 952 err = compat_nf_setsockopt(sk, PF_INET6, optname, 953 optval, optlen); 954 release_sock(sk); 955 } 956 #endif 957 return err; 958 } 959 EXPORT_SYMBOL(compat_ipv6_setsockopt); 960 #endif 961 962 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt, 963 int optname, char __user *optval, int len) 964 { 965 struct ipv6_opt_hdr *hdr; 966 967 if (!opt) 968 return 0; 969 970 switch (optname) { 971 case IPV6_HOPOPTS: 972 hdr = opt->hopopt; 973 break; 974 case IPV6_RTHDRDSTOPTS: 975 hdr = opt->dst0opt; 976 break; 977 case IPV6_RTHDR: 978 hdr = (struct ipv6_opt_hdr *)opt->srcrt; 979 break; 980 case IPV6_DSTOPTS: 981 hdr = opt->dst1opt; 982 break; 983 default: 984 return -EINVAL; /* should not happen */ 985 } 986 987 if (!hdr) 988 return 0; 989 990 len = min_t(unsigned int, len, ipv6_optlen(hdr)); 991 if (copy_to_user(optval, hdr, len)) 992 return -EFAULT; 993 return len; 994 } 995 996 static int do_ipv6_getsockopt(struct sock *sk, int level, int optname, 997 char __user *optval, int __user *optlen, unsigned int flags) 998 { 999 struct ipv6_pinfo *np = inet6_sk(sk); 1000 int len; 1001 int val; 1002 1003 if (ip6_mroute_opt(optname)) 1004 return ip6_mroute_getsockopt(sk, optname, optval, optlen); 1005 1006 if (get_user(len, optlen)) 1007 return -EFAULT; 1008 switch (optname) { 1009 case IPV6_ADDRFORM: 1010 if (sk->sk_protocol != IPPROTO_UDP && 1011 sk->sk_protocol != IPPROTO_UDPLITE && 1012 sk->sk_protocol != IPPROTO_TCP) 1013 return -ENOPROTOOPT; 1014 if (sk->sk_state != TCP_ESTABLISHED) 1015 return -ENOTCONN; 1016 val = sk->sk_family; 1017 break; 1018 case MCAST_MSFILTER: 1019 { 1020 struct group_filter gsf; 1021 int err; 1022 1023 if (len < GROUP_FILTER_SIZE(0)) 1024 return -EINVAL; 1025 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) 1026 return -EFAULT; 1027 if (gsf.gf_group.ss_family != AF_INET6) 1028 return -EADDRNOTAVAIL; 1029 lock_sock(sk); 1030 err = ip6_mc_msfget(sk, &gsf, 1031 (struct group_filter __user *)optval, optlen); 1032 release_sock(sk); 1033 return err; 1034 } 1035 1036 case IPV6_2292PKTOPTIONS: 1037 { 1038 struct msghdr msg; 1039 struct sk_buff *skb; 1040 1041 if (sk->sk_type != SOCK_STREAM) 1042 return -ENOPROTOOPT; 1043 1044 msg.msg_control = optval; 1045 msg.msg_controllen = len; 1046 msg.msg_flags = flags; 1047 1048 lock_sock(sk); 1049 skb = np->pktoptions; 1050 if (skb) 1051 ip6_datagram_recv_ctl(sk, &msg, skb); 1052 release_sock(sk); 1053 if (!skb) { 1054 if (np->rxopt.bits.rxinfo) { 1055 struct in6_pktinfo src_info; 1056 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif : 1057 np->sticky_pktinfo.ipi6_ifindex; 1058 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr : np->sticky_pktinfo.ipi6_addr; 1059 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info); 1060 } 1061 if (np->rxopt.bits.rxhlim) { 1062 int hlim = np->mcast_hops; 1063 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim); 1064 } 1065 if (np->rxopt.bits.rxtclass) { 1066 int tclass = (int)ip6_tclass(np->rcv_flowinfo); 1067 1068 put_cmsg(&msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass); 1069 } 1070 if (np->rxopt.bits.rxoinfo) { 1071 struct in6_pktinfo src_info; 1072 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif : 1073 np->sticky_pktinfo.ipi6_ifindex; 1074 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr : 1075 np->sticky_pktinfo.ipi6_addr; 1076 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info); 1077 } 1078 if (np->rxopt.bits.rxohlim) { 1079 int hlim = np->mcast_hops; 1080 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim); 1081 } 1082 if (np->rxopt.bits.rxflow) { 1083 __be32 flowinfo = np->rcv_flowinfo; 1084 1085 put_cmsg(&msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo); 1086 } 1087 } 1088 len -= msg.msg_controllen; 1089 return put_user(len, optlen); 1090 } 1091 case IPV6_MTU: 1092 { 1093 struct dst_entry *dst; 1094 1095 val = 0; 1096 rcu_read_lock(); 1097 dst = __sk_dst_get(sk); 1098 if (dst) 1099 val = dst_mtu(dst); 1100 rcu_read_unlock(); 1101 if (!val) 1102 return -ENOTCONN; 1103 break; 1104 } 1105 1106 case IPV6_V6ONLY: 1107 val = sk->sk_ipv6only; 1108 break; 1109 1110 case IPV6_RECVPKTINFO: 1111 val = np->rxopt.bits.rxinfo; 1112 break; 1113 1114 case IPV6_2292PKTINFO: 1115 val = np->rxopt.bits.rxoinfo; 1116 break; 1117 1118 case IPV6_RECVHOPLIMIT: 1119 val = np->rxopt.bits.rxhlim; 1120 break; 1121 1122 case IPV6_2292HOPLIMIT: 1123 val = np->rxopt.bits.rxohlim; 1124 break; 1125 1126 case IPV6_RECVRTHDR: 1127 val = np->rxopt.bits.srcrt; 1128 break; 1129 1130 case IPV6_2292RTHDR: 1131 val = np->rxopt.bits.osrcrt; 1132 break; 1133 1134 case IPV6_HOPOPTS: 1135 case IPV6_RTHDRDSTOPTS: 1136 case IPV6_RTHDR: 1137 case IPV6_DSTOPTS: 1138 { 1139 struct ipv6_txoptions *opt; 1140 1141 lock_sock(sk); 1142 opt = rcu_dereference_protected(np->opt, 1143 lockdep_sock_is_held(sk)); 1144 len = ipv6_getsockopt_sticky(sk, opt, optname, optval, len); 1145 release_sock(sk); 1146 /* check if ipv6_getsockopt_sticky() returns err code */ 1147 if (len < 0) 1148 return len; 1149 return put_user(len, optlen); 1150 } 1151 1152 case IPV6_RECVHOPOPTS: 1153 val = np->rxopt.bits.hopopts; 1154 break; 1155 1156 case IPV6_2292HOPOPTS: 1157 val = np->rxopt.bits.ohopopts; 1158 break; 1159 1160 case IPV6_RECVDSTOPTS: 1161 val = np->rxopt.bits.dstopts; 1162 break; 1163 1164 case IPV6_2292DSTOPTS: 1165 val = np->rxopt.bits.odstopts; 1166 break; 1167 1168 case IPV6_TCLASS: 1169 val = np->tclass; 1170 break; 1171 1172 case IPV6_RECVTCLASS: 1173 val = np->rxopt.bits.rxtclass; 1174 break; 1175 1176 case IPV6_FLOWINFO: 1177 val = np->rxopt.bits.rxflow; 1178 break; 1179 1180 case IPV6_RECVPATHMTU: 1181 val = np->rxopt.bits.rxpmtu; 1182 break; 1183 1184 case IPV6_PATHMTU: 1185 { 1186 struct dst_entry *dst; 1187 struct ip6_mtuinfo mtuinfo; 1188 1189 if (len < sizeof(mtuinfo)) 1190 return -EINVAL; 1191 1192 len = sizeof(mtuinfo); 1193 memset(&mtuinfo, 0, sizeof(mtuinfo)); 1194 1195 rcu_read_lock(); 1196 dst = __sk_dst_get(sk); 1197 if (dst) 1198 mtuinfo.ip6m_mtu = dst_mtu(dst); 1199 rcu_read_unlock(); 1200 if (!mtuinfo.ip6m_mtu) 1201 return -ENOTCONN; 1202 1203 if (put_user(len, optlen)) 1204 return -EFAULT; 1205 if (copy_to_user(optval, &mtuinfo, len)) 1206 return -EFAULT; 1207 1208 return 0; 1209 } 1210 1211 case IPV6_TRANSPARENT: 1212 val = inet_sk(sk)->transparent; 1213 break; 1214 1215 case IPV6_RECVORIGDSTADDR: 1216 val = np->rxopt.bits.rxorigdstaddr; 1217 break; 1218 1219 case IPV6_UNICAST_HOPS: 1220 case IPV6_MULTICAST_HOPS: 1221 { 1222 struct dst_entry *dst; 1223 1224 if (optname == IPV6_UNICAST_HOPS) 1225 val = np->hop_limit; 1226 else 1227 val = np->mcast_hops; 1228 1229 if (val < 0) { 1230 rcu_read_lock(); 1231 dst = __sk_dst_get(sk); 1232 if (dst) 1233 val = ip6_dst_hoplimit(dst); 1234 rcu_read_unlock(); 1235 } 1236 1237 if (val < 0) 1238 val = sock_net(sk)->ipv6.devconf_all->hop_limit; 1239 break; 1240 } 1241 1242 case IPV6_MULTICAST_LOOP: 1243 val = np->mc_loop; 1244 break; 1245 1246 case IPV6_MULTICAST_IF: 1247 val = np->mcast_oif; 1248 break; 1249 1250 case IPV6_UNICAST_IF: 1251 val = (__force int)htonl((__u32) np->ucast_oif); 1252 break; 1253 1254 case IPV6_MTU_DISCOVER: 1255 val = np->pmtudisc; 1256 break; 1257 1258 case IPV6_RECVERR: 1259 val = np->recverr; 1260 break; 1261 1262 case IPV6_FLOWINFO_SEND: 1263 val = np->sndflow; 1264 break; 1265 1266 case IPV6_FLOWLABEL_MGR: 1267 { 1268 struct in6_flowlabel_req freq; 1269 int flags; 1270 1271 if (len < sizeof(freq)) 1272 return -EINVAL; 1273 1274 if (copy_from_user(&freq, optval, sizeof(freq))) 1275 return -EFAULT; 1276 1277 if (freq.flr_action != IPV6_FL_A_GET) 1278 return -EINVAL; 1279 1280 len = sizeof(freq); 1281 flags = freq.flr_flags; 1282 1283 memset(&freq, 0, sizeof(freq)); 1284 1285 val = ipv6_flowlabel_opt_get(sk, &freq, flags); 1286 if (val < 0) 1287 return val; 1288 1289 if (put_user(len, optlen)) 1290 return -EFAULT; 1291 if (copy_to_user(optval, &freq, len)) 1292 return -EFAULT; 1293 1294 return 0; 1295 } 1296 1297 case IPV6_ADDR_PREFERENCES: 1298 val = 0; 1299 1300 if (np->srcprefs & IPV6_PREFER_SRC_TMP) 1301 val |= IPV6_PREFER_SRC_TMP; 1302 else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC) 1303 val |= IPV6_PREFER_SRC_PUBLIC; 1304 else { 1305 /* XXX: should we return system default? */ 1306 val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT; 1307 } 1308 1309 if (np->srcprefs & IPV6_PREFER_SRC_COA) 1310 val |= IPV6_PREFER_SRC_COA; 1311 else 1312 val |= IPV6_PREFER_SRC_HOME; 1313 break; 1314 1315 case IPV6_MINHOPCOUNT: 1316 val = np->min_hopcount; 1317 break; 1318 1319 case IPV6_DONTFRAG: 1320 val = np->dontfrag; 1321 break; 1322 1323 case IPV6_AUTOFLOWLABEL: 1324 val = np->autoflowlabel; 1325 break; 1326 1327 case IPV6_RECVFRAGSIZE: 1328 val = np->rxopt.bits.recvfragsize; 1329 break; 1330 1331 default: 1332 return -ENOPROTOOPT; 1333 } 1334 len = min_t(unsigned int, sizeof(int), len); 1335 if (put_user(len, optlen)) 1336 return -EFAULT; 1337 if (copy_to_user(optval, &val, len)) 1338 return -EFAULT; 1339 return 0; 1340 } 1341 1342 int ipv6_getsockopt(struct sock *sk, int level, int optname, 1343 char __user *optval, int __user *optlen) 1344 { 1345 int err; 1346 1347 if (level == SOL_IP && sk->sk_type != SOCK_RAW) 1348 return udp_prot.getsockopt(sk, level, optname, optval, optlen); 1349 1350 if (level != SOL_IPV6) 1351 return -ENOPROTOOPT; 1352 1353 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen, 0); 1354 #ifdef CONFIG_NETFILTER 1355 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1356 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) { 1357 int len; 1358 1359 if (get_user(len, optlen)) 1360 return -EFAULT; 1361 1362 lock_sock(sk); 1363 err = nf_getsockopt(sk, PF_INET6, optname, optval, 1364 &len); 1365 release_sock(sk); 1366 if (err >= 0) 1367 err = put_user(len, optlen); 1368 } 1369 #endif 1370 return err; 1371 } 1372 EXPORT_SYMBOL(ipv6_getsockopt); 1373 1374 #ifdef CONFIG_COMPAT 1375 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname, 1376 char __user *optval, int __user *optlen) 1377 { 1378 int err; 1379 1380 if (level == SOL_IP && sk->sk_type != SOCK_RAW) { 1381 if (udp_prot.compat_getsockopt != NULL) 1382 return udp_prot.compat_getsockopt(sk, level, optname, 1383 optval, optlen); 1384 return udp_prot.getsockopt(sk, level, optname, optval, optlen); 1385 } 1386 1387 if (level != SOL_IPV6) 1388 return -ENOPROTOOPT; 1389 1390 if (optname == MCAST_MSFILTER) 1391 return compat_mc_getsockopt(sk, level, optname, optval, optlen, 1392 ipv6_getsockopt); 1393 1394 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen, 1395 MSG_CMSG_COMPAT); 1396 #ifdef CONFIG_NETFILTER 1397 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1398 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) { 1399 int len; 1400 1401 if (get_user(len, optlen)) 1402 return -EFAULT; 1403 1404 lock_sock(sk); 1405 err = compat_nf_getsockopt(sk, PF_INET6, 1406 optname, optval, &len); 1407 release_sock(sk); 1408 if (err >= 0) 1409 err = put_user(len, optlen); 1410 } 1411 #endif 1412 return err; 1413 } 1414 EXPORT_SYMBOL(compat_ipv6_getsockopt); 1415 #endif 1416 1417