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 40 #include <net/sock.h> 41 #include <net/snmp.h> 42 #include <net/ipv6.h> 43 #include <net/ndisc.h> 44 #include <net/protocol.h> 45 #include <net/transp_v6.h> 46 #include <net/ip6_route.h> 47 #include <net/addrconf.h> 48 #include <net/inet_common.h> 49 #include <net/tcp.h> 50 #include <net/udp.h> 51 #include <net/udplite.h> 52 #include <net/xfrm.h> 53 #include <net/compat.h> 54 55 #include <asm/uaccess.h> 56 57 DEFINE_SNMP_STAT(struct ipstats_mib, ipv6_statistics) __read_mostly; 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)->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 == NULL) { 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 static 103 struct ipv6_txoptions *ipv6_update_options(struct sock *sk, 104 struct ipv6_txoptions *opt) 105 { 106 if (inet_sk(sk)->is_icsk) { 107 if (opt && 108 !((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) && 109 inet_sk(sk)->daddr != LOOPBACK4_IPV6) { 110 struct inet_connection_sock *icsk = inet_csk(sk); 111 icsk->icsk_ext_hdr_len = opt->opt_flen + opt->opt_nflen; 112 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie); 113 } 114 opt = xchg(&inet6_sk(sk)->opt, opt); 115 } else { 116 write_lock(&sk->sk_dst_lock); 117 opt = xchg(&inet6_sk(sk)->opt, opt); 118 write_unlock(&sk->sk_dst_lock); 119 } 120 sk_dst_reset(sk); 121 122 return opt; 123 } 124 125 static int do_ipv6_setsockopt(struct sock *sk, int level, int optname, 126 char __user *optval, unsigned int optlen) 127 { 128 struct ipv6_pinfo *np = inet6_sk(sk); 129 struct net *net = sock_net(sk); 130 int val, valbool; 131 int retv = -ENOPROTOOPT; 132 133 if (optval == NULL) 134 val=0; 135 else { 136 if (optlen >= sizeof(int)) { 137 if (get_user(val, (int __user *) optval)) 138 return -EFAULT; 139 } else 140 val = 0; 141 } 142 143 valbool = (val!=0); 144 145 if (ip6_mroute_opt(optname)) 146 return ip6_mroute_setsockopt(sk, optname, optval, optlen); 147 148 lock_sock(sk); 149 150 switch (optname) { 151 152 case IPV6_ADDRFORM: 153 if (optlen < sizeof(int)) 154 goto e_inval; 155 if (val == PF_INET) { 156 struct ipv6_txoptions *opt; 157 struct sk_buff *pktopt; 158 159 if (sk->sk_type == SOCK_RAW) 160 break; 161 162 if (sk->sk_protocol == IPPROTO_UDP || 163 sk->sk_protocol == IPPROTO_UDPLITE) { 164 struct udp_sock *up = udp_sk(sk); 165 if (up->pending == AF_INET6) { 166 retv = -EBUSY; 167 break; 168 } 169 } else if (sk->sk_protocol != IPPROTO_TCP) 170 break; 171 172 if (sk->sk_state != TCP_ESTABLISHED) { 173 retv = -ENOTCONN; 174 break; 175 } 176 177 if (ipv6_only_sock(sk) || 178 !ipv6_addr_v4mapped(&np->daddr)) { 179 retv = -EADDRNOTAVAIL; 180 break; 181 } 182 183 fl6_free_socklist(sk); 184 ipv6_sock_mc_close(sk); 185 186 /* 187 * Sock is moving from IPv6 to IPv4 (sk_prot), so 188 * remove it from the refcnt debug socks count in the 189 * original family... 190 */ 191 sk_refcnt_debug_dec(sk); 192 193 if (sk->sk_protocol == IPPROTO_TCP) { 194 struct inet_connection_sock *icsk = inet_csk(sk); 195 local_bh_disable(); 196 sock_prot_inuse_add(net, sk->sk_prot, -1); 197 sock_prot_inuse_add(net, &tcp_prot, 1); 198 local_bh_enable(); 199 sk->sk_prot = &tcp_prot; 200 icsk->icsk_af_ops = &ipv4_specific; 201 sk->sk_socket->ops = &inet_stream_ops; 202 sk->sk_family = PF_INET; 203 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie); 204 } else { 205 struct proto *prot = &udp_prot; 206 207 if (sk->sk_protocol == IPPROTO_UDPLITE) 208 prot = &udplite_prot; 209 local_bh_disable(); 210 sock_prot_inuse_add(net, sk->sk_prot, -1); 211 sock_prot_inuse_add(net, prot, 1); 212 local_bh_enable(); 213 sk->sk_prot = prot; 214 sk->sk_socket->ops = &inet_dgram_ops; 215 sk->sk_family = PF_INET; 216 } 217 opt = xchg(&np->opt, NULL); 218 if (opt) 219 sock_kfree_s(sk, opt, opt->tot_len); 220 pktopt = xchg(&np->pktoptions, NULL); 221 kfree_skb(pktopt); 222 223 sk->sk_destruct = inet_sock_destruct; 224 /* 225 * ... and add it to the refcnt debug socks count 226 * in the new family. -acme 227 */ 228 sk_refcnt_debug_inc(sk); 229 module_put(THIS_MODULE); 230 retv = 0; 231 break; 232 } 233 goto e_inval; 234 235 case IPV6_V6ONLY: 236 if (optlen < sizeof(int) || 237 inet_sk(sk)->num) 238 goto e_inval; 239 np->ipv6only = valbool; 240 retv = 0; 241 break; 242 243 case IPV6_RECVPKTINFO: 244 if (optlen < sizeof(int)) 245 goto e_inval; 246 np->rxopt.bits.rxinfo = valbool; 247 retv = 0; 248 break; 249 250 case IPV6_2292PKTINFO: 251 if (optlen < sizeof(int)) 252 goto e_inval; 253 np->rxopt.bits.rxoinfo = valbool; 254 retv = 0; 255 break; 256 257 case IPV6_RECVHOPLIMIT: 258 if (optlen < sizeof(int)) 259 goto e_inval; 260 np->rxopt.bits.rxhlim = valbool; 261 retv = 0; 262 break; 263 264 case IPV6_2292HOPLIMIT: 265 if (optlen < sizeof(int)) 266 goto e_inval; 267 np->rxopt.bits.rxohlim = valbool; 268 retv = 0; 269 break; 270 271 case IPV6_RECVRTHDR: 272 if (optlen < sizeof(int)) 273 goto e_inval; 274 np->rxopt.bits.srcrt = valbool; 275 retv = 0; 276 break; 277 278 case IPV6_2292RTHDR: 279 if (optlen < sizeof(int)) 280 goto e_inval; 281 np->rxopt.bits.osrcrt = valbool; 282 retv = 0; 283 break; 284 285 case IPV6_RECVHOPOPTS: 286 if (optlen < sizeof(int)) 287 goto e_inval; 288 np->rxopt.bits.hopopts = valbool; 289 retv = 0; 290 break; 291 292 case IPV6_2292HOPOPTS: 293 if (optlen < sizeof(int)) 294 goto e_inval; 295 np->rxopt.bits.ohopopts = valbool; 296 retv = 0; 297 break; 298 299 case IPV6_RECVDSTOPTS: 300 if (optlen < sizeof(int)) 301 goto e_inval; 302 np->rxopt.bits.dstopts = valbool; 303 retv = 0; 304 break; 305 306 case IPV6_2292DSTOPTS: 307 if (optlen < sizeof(int)) 308 goto e_inval; 309 np->rxopt.bits.odstopts = valbool; 310 retv = 0; 311 break; 312 313 case IPV6_TCLASS: 314 if (optlen < sizeof(int)) 315 goto e_inval; 316 if (val < -1 || val > 0xff) 317 goto e_inval; 318 /* RFC 3542, 6.5: default traffic class of 0x0 */ 319 if (val == -1) 320 val = 0; 321 np->tclass = val; 322 retv = 0; 323 break; 324 325 case IPV6_RECVTCLASS: 326 if (optlen < sizeof(int)) 327 goto e_inval; 328 np->rxopt.bits.rxtclass = valbool; 329 retv = 0; 330 break; 331 332 case IPV6_FLOWINFO: 333 if (optlen < sizeof(int)) 334 goto e_inval; 335 np->rxopt.bits.rxflow = valbool; 336 retv = 0; 337 break; 338 339 case IPV6_HOPOPTS: 340 case IPV6_RTHDRDSTOPTS: 341 case IPV6_RTHDR: 342 case IPV6_DSTOPTS: 343 { 344 struct ipv6_txoptions *opt; 345 346 /* remove any sticky options header with a zero option 347 * length, per RFC3542. 348 */ 349 if (optlen == 0) 350 optval = NULL; 351 else if (optval == NULL) 352 goto e_inval; 353 else if (optlen < sizeof(struct ipv6_opt_hdr) || 354 optlen & 0x7 || optlen > 8 * 255) 355 goto e_inval; 356 357 /* hop-by-hop / destination options are privileged option */ 358 retv = -EPERM; 359 if (optname != IPV6_RTHDR && !capable(CAP_NET_RAW)) 360 break; 361 362 opt = ipv6_renew_options(sk, np->opt, optname, 363 (struct ipv6_opt_hdr __user *)optval, 364 optlen); 365 if (IS_ERR(opt)) { 366 retv = PTR_ERR(opt); 367 break; 368 } 369 370 /* routing header option needs extra check */ 371 retv = -EINVAL; 372 if (optname == IPV6_RTHDR && opt && opt->srcrt) { 373 struct ipv6_rt_hdr *rthdr = opt->srcrt; 374 switch (rthdr->type) { 375 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 376 case IPV6_SRCRT_TYPE_2: 377 if (rthdr->hdrlen != 2 || 378 rthdr->segments_left != 1) 379 goto sticky_done; 380 381 break; 382 #endif 383 default: 384 goto sticky_done; 385 } 386 } 387 388 retv = 0; 389 opt = ipv6_update_options(sk, opt); 390 sticky_done: 391 if (opt) 392 sock_kfree_s(sk, opt, opt->tot_len); 393 break; 394 } 395 396 case IPV6_PKTINFO: 397 { 398 struct in6_pktinfo pkt; 399 400 if (optlen == 0) 401 goto e_inval; 402 else if (optlen < sizeof(struct in6_pktinfo) || optval == NULL) 403 goto e_inval; 404 405 if (copy_from_user(&pkt, optval, sizeof(struct in6_pktinfo))) { 406 retv = -EFAULT; 407 break; 408 } 409 if (sk->sk_bound_dev_if && pkt.ipi6_ifindex != sk->sk_bound_dev_if) 410 goto e_inval; 411 412 np->sticky_pktinfo.ipi6_ifindex = pkt.ipi6_ifindex; 413 ipv6_addr_copy(&np->sticky_pktinfo.ipi6_addr, &pkt.ipi6_addr); 414 retv = 0; 415 break; 416 } 417 418 case IPV6_2292PKTOPTIONS: 419 { 420 struct ipv6_txoptions *opt = NULL; 421 struct msghdr msg; 422 struct flowi fl; 423 int junk; 424 425 fl.fl6_flowlabel = 0; 426 fl.oif = sk->sk_bound_dev_if; 427 428 if (optlen == 0) 429 goto update; 430 431 /* 1K is probably excessive 432 * 1K is surely not enough, 2K per standard header is 16K. 433 */ 434 retv = -EINVAL; 435 if (optlen > 64*1024) 436 break; 437 438 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL); 439 retv = -ENOBUFS; 440 if (opt == NULL) 441 break; 442 443 memset(opt, 0, sizeof(*opt)); 444 opt->tot_len = sizeof(*opt) + optlen; 445 retv = -EFAULT; 446 if (copy_from_user(opt+1, optval, optlen)) 447 goto done; 448 449 msg.msg_controllen = optlen; 450 msg.msg_control = (void*)(opt+1); 451 452 retv = datagram_send_ctl(net, &msg, &fl, opt, &junk, &junk); 453 if (retv) 454 goto done; 455 update: 456 retv = 0; 457 opt = ipv6_update_options(sk, opt); 458 done: 459 if (opt) 460 sock_kfree_s(sk, opt, opt->tot_len); 461 break; 462 } 463 case IPV6_UNICAST_HOPS: 464 if (optlen < sizeof(int)) 465 goto e_inval; 466 if (val > 255 || val < -1) 467 goto e_inval; 468 np->hop_limit = val; 469 retv = 0; 470 break; 471 472 case IPV6_MULTICAST_HOPS: 473 if (sk->sk_type == SOCK_STREAM) 474 break; 475 if (optlen < sizeof(int)) 476 goto e_inval; 477 if (val > 255 || val < -1) 478 goto e_inval; 479 np->mcast_hops = val; 480 retv = 0; 481 break; 482 483 case IPV6_MULTICAST_LOOP: 484 if (optlen < sizeof(int)) 485 goto e_inval; 486 if (val != valbool) 487 goto e_inval; 488 np->mc_loop = valbool; 489 retv = 0; 490 break; 491 492 case IPV6_MULTICAST_IF: 493 if (sk->sk_type == SOCK_STREAM) 494 break; 495 if (optlen < sizeof(int)) 496 goto e_inval; 497 498 if (val) { 499 struct net_device *dev; 500 501 if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != val) 502 goto e_inval; 503 504 dev = dev_get_by_index(net, val); 505 if (!dev) { 506 retv = -ENODEV; 507 break; 508 } 509 dev_put(dev); 510 } 511 np->mcast_oif = val; 512 retv = 0; 513 break; 514 case IPV6_ADD_MEMBERSHIP: 515 case IPV6_DROP_MEMBERSHIP: 516 { 517 struct ipv6_mreq mreq; 518 519 if (optlen < sizeof(struct ipv6_mreq)) 520 goto e_inval; 521 522 retv = -EPROTO; 523 if (inet_sk(sk)->is_icsk) 524 break; 525 526 retv = -EFAULT; 527 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq))) 528 break; 529 530 if (optname == IPV6_ADD_MEMBERSHIP) 531 retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr); 532 else 533 retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr); 534 break; 535 } 536 case IPV6_JOIN_ANYCAST: 537 case IPV6_LEAVE_ANYCAST: 538 { 539 struct ipv6_mreq mreq; 540 541 if (optlen < sizeof(struct ipv6_mreq)) 542 goto e_inval; 543 544 retv = -EFAULT; 545 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq))) 546 break; 547 548 if (optname == IPV6_JOIN_ANYCAST) 549 retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr); 550 else 551 retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr); 552 break; 553 } 554 case MCAST_JOIN_GROUP: 555 case MCAST_LEAVE_GROUP: 556 { 557 struct group_req greq; 558 struct sockaddr_in6 *psin6; 559 560 if (optlen < sizeof(struct group_req)) 561 goto e_inval; 562 563 retv = -EFAULT; 564 if (copy_from_user(&greq, optval, sizeof(struct group_req))) 565 break; 566 if (greq.gr_group.ss_family != AF_INET6) { 567 retv = -EADDRNOTAVAIL; 568 break; 569 } 570 psin6 = (struct sockaddr_in6 *)&greq.gr_group; 571 if (optname == MCAST_JOIN_GROUP) 572 retv = ipv6_sock_mc_join(sk, greq.gr_interface, 573 &psin6->sin6_addr); 574 else 575 retv = ipv6_sock_mc_drop(sk, greq.gr_interface, 576 &psin6->sin6_addr); 577 break; 578 } 579 case MCAST_JOIN_SOURCE_GROUP: 580 case MCAST_LEAVE_SOURCE_GROUP: 581 case MCAST_BLOCK_SOURCE: 582 case MCAST_UNBLOCK_SOURCE: 583 { 584 struct group_source_req greqs; 585 int omode, add; 586 587 if (optlen < sizeof(struct group_source_req)) 588 goto e_inval; 589 if (copy_from_user(&greqs, optval, sizeof(greqs))) { 590 retv = -EFAULT; 591 break; 592 } 593 if (greqs.gsr_group.ss_family != AF_INET6 || 594 greqs.gsr_source.ss_family != AF_INET6) { 595 retv = -EADDRNOTAVAIL; 596 break; 597 } 598 if (optname == MCAST_BLOCK_SOURCE) { 599 omode = MCAST_EXCLUDE; 600 add = 1; 601 } else if (optname == MCAST_UNBLOCK_SOURCE) { 602 omode = MCAST_EXCLUDE; 603 add = 0; 604 } else if (optname == MCAST_JOIN_SOURCE_GROUP) { 605 struct sockaddr_in6 *psin6; 606 607 psin6 = (struct sockaddr_in6 *)&greqs.gsr_group; 608 retv = ipv6_sock_mc_join(sk, greqs.gsr_interface, 609 &psin6->sin6_addr); 610 /* prior join w/ different source is ok */ 611 if (retv && retv != -EADDRINUSE) 612 break; 613 omode = MCAST_INCLUDE; 614 add = 1; 615 } else /* MCAST_LEAVE_SOURCE_GROUP */ { 616 omode = MCAST_INCLUDE; 617 add = 0; 618 } 619 retv = ip6_mc_source(add, omode, sk, &greqs); 620 break; 621 } 622 case MCAST_MSFILTER: 623 { 624 extern int sysctl_mld_max_msf; 625 struct group_filter *gsf; 626 627 if (optlen < GROUP_FILTER_SIZE(0)) 628 goto e_inval; 629 if (optlen > sysctl_optmem_max) { 630 retv = -ENOBUFS; 631 break; 632 } 633 gsf = kmalloc(optlen,GFP_KERNEL); 634 if (!gsf) { 635 retv = -ENOBUFS; 636 break; 637 } 638 retv = -EFAULT; 639 if (copy_from_user(gsf, optval, optlen)) { 640 kfree(gsf); 641 break; 642 } 643 /* numsrc >= (4G-140)/128 overflow in 32 bits */ 644 if (gsf->gf_numsrc >= 0x1ffffffU || 645 gsf->gf_numsrc > sysctl_mld_max_msf) { 646 kfree(gsf); 647 retv = -ENOBUFS; 648 break; 649 } 650 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) { 651 kfree(gsf); 652 retv = -EINVAL; 653 break; 654 } 655 retv = ip6_mc_msfilter(sk, gsf); 656 kfree(gsf); 657 658 break; 659 } 660 case IPV6_ROUTER_ALERT: 661 if (optlen < sizeof(int)) 662 goto e_inval; 663 retv = ip6_ra_control(sk, val); 664 break; 665 case IPV6_MTU_DISCOVER: 666 if (optlen < sizeof(int)) 667 goto e_inval; 668 if (val<0 || val>3) 669 goto e_inval; 670 np->pmtudisc = val; 671 retv = 0; 672 break; 673 case IPV6_MTU: 674 if (optlen < sizeof(int)) 675 goto e_inval; 676 if (val && val < IPV6_MIN_MTU) 677 goto e_inval; 678 np->frag_size = val; 679 retv = 0; 680 break; 681 case IPV6_RECVERR: 682 if (optlen < sizeof(int)) 683 goto e_inval; 684 np->recverr = valbool; 685 if (!val) 686 skb_queue_purge(&sk->sk_error_queue); 687 retv = 0; 688 break; 689 case IPV6_FLOWINFO_SEND: 690 if (optlen < sizeof(int)) 691 goto e_inval; 692 np->sndflow = valbool; 693 retv = 0; 694 break; 695 case IPV6_FLOWLABEL_MGR: 696 retv = ipv6_flowlabel_opt(sk, optval, optlen); 697 break; 698 case IPV6_IPSEC_POLICY: 699 case IPV6_XFRM_POLICY: 700 retv = -EPERM; 701 if (!capable(CAP_NET_ADMIN)) 702 break; 703 retv = xfrm_user_policy(sk, optname, optval, optlen); 704 break; 705 706 case IPV6_ADDR_PREFERENCES: 707 { 708 unsigned int pref = 0; 709 unsigned int prefmask = ~0; 710 711 if (optlen < sizeof(int)) 712 goto e_inval; 713 714 retv = -EINVAL; 715 716 /* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */ 717 switch (val & (IPV6_PREFER_SRC_PUBLIC| 718 IPV6_PREFER_SRC_TMP| 719 IPV6_PREFER_SRC_PUBTMP_DEFAULT)) { 720 case IPV6_PREFER_SRC_PUBLIC: 721 pref |= IPV6_PREFER_SRC_PUBLIC; 722 break; 723 case IPV6_PREFER_SRC_TMP: 724 pref |= IPV6_PREFER_SRC_TMP; 725 break; 726 case IPV6_PREFER_SRC_PUBTMP_DEFAULT: 727 break; 728 case 0: 729 goto pref_skip_pubtmp; 730 default: 731 goto e_inval; 732 } 733 734 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC| 735 IPV6_PREFER_SRC_TMP); 736 pref_skip_pubtmp: 737 738 /* check HOME/COA conflicts */ 739 switch (val & (IPV6_PREFER_SRC_HOME|IPV6_PREFER_SRC_COA)) { 740 case IPV6_PREFER_SRC_HOME: 741 break; 742 case IPV6_PREFER_SRC_COA: 743 pref |= IPV6_PREFER_SRC_COA; 744 case 0: 745 goto pref_skip_coa; 746 default: 747 goto e_inval; 748 } 749 750 prefmask &= ~IPV6_PREFER_SRC_COA; 751 pref_skip_coa: 752 753 /* check CGA/NONCGA conflicts */ 754 switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) { 755 case IPV6_PREFER_SRC_CGA: 756 case IPV6_PREFER_SRC_NONCGA: 757 case 0: 758 break; 759 default: 760 goto e_inval; 761 } 762 763 np->srcprefs = (np->srcprefs & prefmask) | pref; 764 retv = 0; 765 766 break; 767 } 768 } 769 770 release_sock(sk); 771 772 return retv; 773 774 e_inval: 775 release_sock(sk); 776 return -EINVAL; 777 } 778 779 int ipv6_setsockopt(struct sock *sk, int level, int optname, 780 char __user *optval, unsigned int optlen) 781 { 782 int err; 783 784 if (level == SOL_IP && sk->sk_type != SOCK_RAW) 785 return udp_prot.setsockopt(sk, level, optname, optval, optlen); 786 787 if (level != SOL_IPV6) 788 return -ENOPROTOOPT; 789 790 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen); 791 #ifdef CONFIG_NETFILTER 792 /* we need to exclude all possible ENOPROTOOPTs except default case */ 793 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY && 794 optname != IPV6_XFRM_POLICY) { 795 lock_sock(sk); 796 err = nf_setsockopt(sk, PF_INET6, optname, optval, 797 optlen); 798 release_sock(sk); 799 } 800 #endif 801 return err; 802 } 803 804 EXPORT_SYMBOL(ipv6_setsockopt); 805 806 #ifdef CONFIG_COMPAT 807 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname, 808 char __user *optval, unsigned int optlen) 809 { 810 int err; 811 812 if (level == SOL_IP && sk->sk_type != SOCK_RAW) { 813 if (udp_prot.compat_setsockopt != NULL) 814 return udp_prot.compat_setsockopt(sk, level, optname, 815 optval, optlen); 816 return udp_prot.setsockopt(sk, level, optname, optval, optlen); 817 } 818 819 if (level != SOL_IPV6) 820 return -ENOPROTOOPT; 821 822 if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER) 823 return compat_mc_setsockopt(sk, level, optname, optval, optlen, 824 ipv6_setsockopt); 825 826 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen); 827 #ifdef CONFIG_NETFILTER 828 /* we need to exclude all possible ENOPROTOOPTs except default case */ 829 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY && 830 optname != IPV6_XFRM_POLICY) { 831 lock_sock(sk); 832 err = compat_nf_setsockopt(sk, PF_INET6, optname, 833 optval, optlen); 834 release_sock(sk); 835 } 836 #endif 837 return err; 838 } 839 840 EXPORT_SYMBOL(compat_ipv6_setsockopt); 841 #endif 842 843 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt, 844 int optname, char __user *optval, int len) 845 { 846 struct ipv6_opt_hdr *hdr; 847 848 if (!opt) 849 return 0; 850 851 switch(optname) { 852 case IPV6_HOPOPTS: 853 hdr = opt->hopopt; 854 break; 855 case IPV6_RTHDRDSTOPTS: 856 hdr = opt->dst0opt; 857 break; 858 case IPV6_RTHDR: 859 hdr = (struct ipv6_opt_hdr *)opt->srcrt; 860 break; 861 case IPV6_DSTOPTS: 862 hdr = opt->dst1opt; 863 break; 864 default: 865 return -EINVAL; /* should not happen */ 866 } 867 868 if (!hdr) 869 return 0; 870 871 len = min_t(unsigned int, len, ipv6_optlen(hdr)); 872 if (copy_to_user(optval, hdr, len)) 873 return -EFAULT; 874 return len; 875 } 876 877 static int do_ipv6_getsockopt(struct sock *sk, int level, int optname, 878 char __user *optval, int __user *optlen) 879 { 880 struct ipv6_pinfo *np = inet6_sk(sk); 881 int len; 882 int val; 883 884 if (ip6_mroute_opt(optname)) 885 return ip6_mroute_getsockopt(sk, optname, optval, optlen); 886 887 if (get_user(len, optlen)) 888 return -EFAULT; 889 switch (optname) { 890 case IPV6_ADDRFORM: 891 if (sk->sk_protocol != IPPROTO_UDP && 892 sk->sk_protocol != IPPROTO_UDPLITE && 893 sk->sk_protocol != IPPROTO_TCP) 894 return -ENOPROTOOPT; 895 if (sk->sk_state != TCP_ESTABLISHED) 896 return -ENOTCONN; 897 val = sk->sk_family; 898 break; 899 case MCAST_MSFILTER: 900 { 901 struct group_filter gsf; 902 int err; 903 904 if (len < GROUP_FILTER_SIZE(0)) 905 return -EINVAL; 906 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) 907 return -EFAULT; 908 if (gsf.gf_group.ss_family != AF_INET6) 909 return -EADDRNOTAVAIL; 910 lock_sock(sk); 911 err = ip6_mc_msfget(sk, &gsf, 912 (struct group_filter __user *)optval, optlen); 913 release_sock(sk); 914 return err; 915 } 916 917 case IPV6_2292PKTOPTIONS: 918 { 919 struct msghdr msg; 920 struct sk_buff *skb; 921 922 if (sk->sk_type != SOCK_STREAM) 923 return -ENOPROTOOPT; 924 925 msg.msg_control = optval; 926 msg.msg_controllen = len; 927 msg.msg_flags = 0; 928 929 lock_sock(sk); 930 skb = np->pktoptions; 931 if (skb) 932 atomic_inc(&skb->users); 933 release_sock(sk); 934 935 if (skb) { 936 int err = datagram_recv_ctl(sk, &msg, skb); 937 kfree_skb(skb); 938 if (err) 939 return err; 940 } else { 941 if (np->rxopt.bits.rxinfo) { 942 struct in6_pktinfo src_info; 943 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif : 944 np->sticky_pktinfo.ipi6_ifindex; 945 np->mcast_oif? ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr) : 946 ipv6_addr_copy(&src_info.ipi6_addr, &(np->sticky_pktinfo.ipi6_addr)); 947 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info); 948 } 949 if (np->rxopt.bits.rxhlim) { 950 int hlim = np->mcast_hops; 951 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim); 952 } 953 if (np->rxopt.bits.rxoinfo) { 954 struct in6_pktinfo src_info; 955 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif : 956 np->sticky_pktinfo.ipi6_ifindex; 957 np->mcast_oif? ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr) : 958 ipv6_addr_copy(&src_info.ipi6_addr, &(np->sticky_pktinfo.ipi6_addr)); 959 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info); 960 } 961 if (np->rxopt.bits.rxohlim) { 962 int hlim = np->mcast_hops; 963 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim); 964 } 965 } 966 len -= msg.msg_controllen; 967 return put_user(len, optlen); 968 } 969 case IPV6_MTU: 970 { 971 struct dst_entry *dst; 972 val = 0; 973 lock_sock(sk); 974 dst = sk_dst_get(sk); 975 if (dst) { 976 val = dst_mtu(dst); 977 dst_release(dst); 978 } 979 release_sock(sk); 980 if (!val) 981 return -ENOTCONN; 982 break; 983 } 984 985 case IPV6_V6ONLY: 986 val = np->ipv6only; 987 break; 988 989 case IPV6_RECVPKTINFO: 990 val = np->rxopt.bits.rxinfo; 991 break; 992 993 case IPV6_2292PKTINFO: 994 val = np->rxopt.bits.rxoinfo; 995 break; 996 997 case IPV6_RECVHOPLIMIT: 998 val = np->rxopt.bits.rxhlim; 999 break; 1000 1001 case IPV6_2292HOPLIMIT: 1002 val = np->rxopt.bits.rxohlim; 1003 break; 1004 1005 case IPV6_RECVRTHDR: 1006 val = np->rxopt.bits.srcrt; 1007 break; 1008 1009 case IPV6_2292RTHDR: 1010 val = np->rxopt.bits.osrcrt; 1011 break; 1012 1013 case IPV6_HOPOPTS: 1014 case IPV6_RTHDRDSTOPTS: 1015 case IPV6_RTHDR: 1016 case IPV6_DSTOPTS: 1017 { 1018 1019 lock_sock(sk); 1020 len = ipv6_getsockopt_sticky(sk, np->opt, 1021 optname, optval, len); 1022 release_sock(sk); 1023 /* check if ipv6_getsockopt_sticky() returns err code */ 1024 if (len < 0) 1025 return len; 1026 return put_user(len, optlen); 1027 } 1028 1029 case IPV6_RECVHOPOPTS: 1030 val = np->rxopt.bits.hopopts; 1031 break; 1032 1033 case IPV6_2292HOPOPTS: 1034 val = np->rxopt.bits.ohopopts; 1035 break; 1036 1037 case IPV6_RECVDSTOPTS: 1038 val = np->rxopt.bits.dstopts; 1039 break; 1040 1041 case IPV6_2292DSTOPTS: 1042 val = np->rxopt.bits.odstopts; 1043 break; 1044 1045 case IPV6_TCLASS: 1046 val = np->tclass; 1047 break; 1048 1049 case IPV6_RECVTCLASS: 1050 val = np->rxopt.bits.rxtclass; 1051 break; 1052 1053 case IPV6_FLOWINFO: 1054 val = np->rxopt.bits.rxflow; 1055 break; 1056 1057 case IPV6_UNICAST_HOPS: 1058 case IPV6_MULTICAST_HOPS: 1059 { 1060 struct dst_entry *dst; 1061 1062 if (optname == IPV6_UNICAST_HOPS) 1063 val = np->hop_limit; 1064 else 1065 val = np->mcast_hops; 1066 1067 dst = sk_dst_get(sk); 1068 if (dst) { 1069 if (val < 0) 1070 val = ip6_dst_hoplimit(dst); 1071 dst_release(dst); 1072 } 1073 if (val < 0) 1074 val = sock_net(sk)->ipv6.devconf_all->hop_limit; 1075 break; 1076 } 1077 1078 case IPV6_MULTICAST_LOOP: 1079 val = np->mc_loop; 1080 break; 1081 1082 case IPV6_MULTICAST_IF: 1083 val = np->mcast_oif; 1084 break; 1085 1086 case IPV6_MTU_DISCOVER: 1087 val = np->pmtudisc; 1088 break; 1089 1090 case IPV6_RECVERR: 1091 val = np->recverr; 1092 break; 1093 1094 case IPV6_FLOWINFO_SEND: 1095 val = np->sndflow; 1096 break; 1097 1098 case IPV6_ADDR_PREFERENCES: 1099 val = 0; 1100 1101 if (np->srcprefs & IPV6_PREFER_SRC_TMP) 1102 val |= IPV6_PREFER_SRC_TMP; 1103 else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC) 1104 val |= IPV6_PREFER_SRC_PUBLIC; 1105 else { 1106 /* XXX: should we return system default? */ 1107 val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT; 1108 } 1109 1110 if (np->srcprefs & IPV6_PREFER_SRC_COA) 1111 val |= IPV6_PREFER_SRC_COA; 1112 else 1113 val |= IPV6_PREFER_SRC_HOME; 1114 break; 1115 1116 default: 1117 return -ENOPROTOOPT; 1118 } 1119 len = min_t(unsigned int, sizeof(int), len); 1120 if(put_user(len, optlen)) 1121 return -EFAULT; 1122 if(copy_to_user(optval,&val,len)) 1123 return -EFAULT; 1124 return 0; 1125 } 1126 1127 int ipv6_getsockopt(struct sock *sk, int level, int optname, 1128 char __user *optval, int __user *optlen) 1129 { 1130 int err; 1131 1132 if (level == SOL_IP && sk->sk_type != SOCK_RAW) 1133 return udp_prot.getsockopt(sk, level, optname, optval, optlen); 1134 1135 if(level != SOL_IPV6) 1136 return -ENOPROTOOPT; 1137 1138 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen); 1139 #ifdef CONFIG_NETFILTER 1140 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1141 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) { 1142 int len; 1143 1144 if (get_user(len, optlen)) 1145 return -EFAULT; 1146 1147 lock_sock(sk); 1148 err = nf_getsockopt(sk, PF_INET6, optname, optval, 1149 &len); 1150 release_sock(sk); 1151 if (err >= 0) 1152 err = put_user(len, optlen); 1153 } 1154 #endif 1155 return err; 1156 } 1157 1158 EXPORT_SYMBOL(ipv6_getsockopt); 1159 1160 #ifdef CONFIG_COMPAT 1161 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname, 1162 char __user *optval, int __user *optlen) 1163 { 1164 int err; 1165 1166 if (level == SOL_IP && sk->sk_type != SOCK_RAW) { 1167 if (udp_prot.compat_getsockopt != NULL) 1168 return udp_prot.compat_getsockopt(sk, level, optname, 1169 optval, optlen); 1170 return udp_prot.getsockopt(sk, level, optname, optval, optlen); 1171 } 1172 1173 if (level != SOL_IPV6) 1174 return -ENOPROTOOPT; 1175 1176 if (optname == MCAST_MSFILTER) 1177 return compat_mc_getsockopt(sk, level, optname, optval, optlen, 1178 ipv6_getsockopt); 1179 1180 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen); 1181 #ifdef CONFIG_NETFILTER 1182 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1183 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) { 1184 int len; 1185 1186 if (get_user(len, optlen)) 1187 return -EFAULT; 1188 1189 lock_sock(sk); 1190 err = compat_nf_getsockopt(sk, PF_INET6, 1191 optname, optval, &len); 1192 release_sock(sk); 1193 if (err >= 0) 1194 err = put_user(len, optlen); 1195 } 1196 #endif 1197 return err; 1198 } 1199 1200 EXPORT_SYMBOL(compat_ipv6_getsockopt); 1201 #endif 1202 1203