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, 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 if (pktopt) 222 kfree_skb(pktopt); 223 224 sk->sk_destruct = inet_sock_destruct; 225 /* 226 * ... and add it to the refcnt debug socks count 227 * in the new family. -acme 228 */ 229 sk_refcnt_debug_inc(sk); 230 module_put(THIS_MODULE); 231 retv = 0; 232 break; 233 } 234 goto e_inval; 235 236 case IPV6_V6ONLY: 237 if (optlen < sizeof(int) || 238 inet_sk(sk)->num) 239 goto e_inval; 240 np->ipv6only = valbool; 241 retv = 0; 242 break; 243 244 case IPV6_RECVPKTINFO: 245 if (optlen < sizeof(int)) 246 goto e_inval; 247 np->rxopt.bits.rxinfo = valbool; 248 retv = 0; 249 break; 250 251 case IPV6_2292PKTINFO: 252 if (optlen < sizeof(int)) 253 goto e_inval; 254 np->rxopt.bits.rxoinfo = valbool; 255 retv = 0; 256 break; 257 258 case IPV6_RECVHOPLIMIT: 259 if (optlen < sizeof(int)) 260 goto e_inval; 261 np->rxopt.bits.rxhlim = valbool; 262 retv = 0; 263 break; 264 265 case IPV6_2292HOPLIMIT: 266 if (optlen < sizeof(int)) 267 goto e_inval; 268 np->rxopt.bits.rxohlim = valbool; 269 retv = 0; 270 break; 271 272 case IPV6_RECVRTHDR: 273 if (optlen < sizeof(int)) 274 goto e_inval; 275 np->rxopt.bits.srcrt = valbool; 276 retv = 0; 277 break; 278 279 case IPV6_2292RTHDR: 280 if (optlen < sizeof(int)) 281 goto e_inval; 282 np->rxopt.bits.osrcrt = valbool; 283 retv = 0; 284 break; 285 286 case IPV6_RECVHOPOPTS: 287 if (optlen < sizeof(int)) 288 goto e_inval; 289 np->rxopt.bits.hopopts = valbool; 290 retv = 0; 291 break; 292 293 case IPV6_2292HOPOPTS: 294 if (optlen < sizeof(int)) 295 goto e_inval; 296 np->rxopt.bits.ohopopts = valbool; 297 retv = 0; 298 break; 299 300 case IPV6_RECVDSTOPTS: 301 if (optlen < sizeof(int)) 302 goto e_inval; 303 np->rxopt.bits.dstopts = valbool; 304 retv = 0; 305 break; 306 307 case IPV6_2292DSTOPTS: 308 if (optlen < sizeof(int)) 309 goto e_inval; 310 np->rxopt.bits.odstopts = valbool; 311 retv = 0; 312 break; 313 314 case IPV6_TCLASS: 315 if (optlen < sizeof(int)) 316 goto e_inval; 317 if (val < -1 || val > 0xff) 318 goto e_inval; 319 np->tclass = val; 320 retv = 0; 321 break; 322 323 case IPV6_RECVTCLASS: 324 if (optlen < sizeof(int)) 325 goto e_inval; 326 np->rxopt.bits.rxtclass = valbool; 327 retv = 0; 328 break; 329 330 case IPV6_FLOWINFO: 331 if (optlen < sizeof(int)) 332 goto e_inval; 333 np->rxopt.bits.rxflow = valbool; 334 retv = 0; 335 break; 336 337 case IPV6_HOPOPTS: 338 case IPV6_RTHDRDSTOPTS: 339 case IPV6_RTHDR: 340 case IPV6_DSTOPTS: 341 { 342 struct ipv6_txoptions *opt; 343 344 /* remove any sticky options header with a zero option 345 * length, per RFC3542. 346 */ 347 if (optlen == 0) 348 optval = NULL; 349 else if (optval == NULL) 350 goto e_inval; 351 else if (optlen < sizeof(struct ipv6_opt_hdr) || 352 optlen & 0x7 || optlen > 8 * 255) 353 goto e_inval; 354 355 /* hop-by-hop / destination options are privileged option */ 356 retv = -EPERM; 357 if (optname != IPV6_RTHDR && !capable(CAP_NET_RAW)) 358 break; 359 360 opt = ipv6_renew_options(sk, np->opt, optname, 361 (struct ipv6_opt_hdr __user *)optval, 362 optlen); 363 if (IS_ERR(opt)) { 364 retv = PTR_ERR(opt); 365 break; 366 } 367 368 /* routing header option needs extra check */ 369 retv = -EINVAL; 370 if (optname == IPV6_RTHDR && opt && opt->srcrt) { 371 struct ipv6_rt_hdr *rthdr = opt->srcrt; 372 switch (rthdr->type) { 373 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 374 case IPV6_SRCRT_TYPE_2: 375 if (rthdr->hdrlen != 2 || 376 rthdr->segments_left != 1) 377 goto sticky_done; 378 379 break; 380 #endif 381 default: 382 goto sticky_done; 383 } 384 385 if ((rthdr->hdrlen & 1) || 386 (rthdr->hdrlen >> 1) != rthdr->segments_left) 387 goto sticky_done; 388 } 389 390 retv = 0; 391 opt = ipv6_update_options(sk, opt); 392 sticky_done: 393 if (opt) 394 sock_kfree_s(sk, opt, opt->tot_len); 395 break; 396 } 397 398 case IPV6_PKTINFO: 399 { 400 struct in6_pktinfo pkt; 401 402 if (optlen == 0) 403 goto e_inval; 404 else if (optlen < sizeof(struct in6_pktinfo) || optval == NULL) 405 goto e_inval; 406 407 if (copy_from_user(&pkt, optval, sizeof(struct in6_pktinfo))) { 408 retv = -EFAULT; 409 break; 410 } 411 if (sk->sk_bound_dev_if && pkt.ipi6_ifindex != sk->sk_bound_dev_if) 412 goto e_inval; 413 414 np->sticky_pktinfo.ipi6_ifindex = pkt.ipi6_ifindex; 415 ipv6_addr_copy(&np->sticky_pktinfo.ipi6_addr, &pkt.ipi6_addr); 416 retv = 0; 417 break; 418 } 419 420 case IPV6_2292PKTOPTIONS: 421 { 422 struct ipv6_txoptions *opt = NULL; 423 struct msghdr msg; 424 struct flowi fl; 425 int junk; 426 427 fl.fl6_flowlabel = 0; 428 fl.oif = sk->sk_bound_dev_if; 429 430 if (optlen == 0) 431 goto update; 432 433 /* 1K is probably excessive 434 * 1K is surely not enough, 2K per standard header is 16K. 435 */ 436 retv = -EINVAL; 437 if (optlen > 64*1024) 438 break; 439 440 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL); 441 retv = -ENOBUFS; 442 if (opt == NULL) 443 break; 444 445 memset(opt, 0, sizeof(*opt)); 446 opt->tot_len = sizeof(*opt) + optlen; 447 retv = -EFAULT; 448 if (copy_from_user(opt+1, optval, optlen)) 449 goto done; 450 451 msg.msg_controllen = optlen; 452 msg.msg_control = (void*)(opt+1); 453 454 retv = datagram_send_ctl(net, &msg, &fl, opt, &junk, &junk); 455 if (retv) 456 goto done; 457 update: 458 retv = 0; 459 opt = ipv6_update_options(sk, opt); 460 done: 461 if (opt) 462 sock_kfree_s(sk, opt, opt->tot_len); 463 break; 464 } 465 case IPV6_UNICAST_HOPS: 466 if (optlen < sizeof(int)) 467 goto e_inval; 468 if (val > 255 || val < -1) 469 goto e_inval; 470 np->hop_limit = val; 471 retv = 0; 472 break; 473 474 case IPV6_MULTICAST_HOPS: 475 if (sk->sk_type == SOCK_STREAM) 476 break; 477 if (optlen < sizeof(int)) 478 goto e_inval; 479 if (val > 255 || val < -1) 480 goto e_inval; 481 np->mcast_hops = val; 482 retv = 0; 483 break; 484 485 case IPV6_MULTICAST_LOOP: 486 if (optlen < sizeof(int)) 487 goto e_inval; 488 if (val != valbool) 489 goto e_inval; 490 np->mc_loop = valbool; 491 retv = 0; 492 break; 493 494 case IPV6_MULTICAST_IF: 495 if (sk->sk_type == SOCK_STREAM) 496 break; 497 if (optlen < sizeof(int)) 498 goto e_inval; 499 500 if (val) { 501 if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != val) 502 goto e_inval; 503 504 if (__dev_get_by_index(net, val) == NULL) { 505 retv = -ENODEV; 506 break; 507 } 508 } 509 np->mcast_oif = val; 510 retv = 0; 511 break; 512 case IPV6_ADD_MEMBERSHIP: 513 case IPV6_DROP_MEMBERSHIP: 514 { 515 struct ipv6_mreq mreq; 516 517 if (optlen < sizeof(struct ipv6_mreq)) 518 goto e_inval; 519 520 retv = -EPROTO; 521 if (inet_sk(sk)->is_icsk) 522 break; 523 524 retv = -EFAULT; 525 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq))) 526 break; 527 528 if (optname == IPV6_ADD_MEMBERSHIP) 529 retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr); 530 else 531 retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr); 532 break; 533 } 534 case IPV6_JOIN_ANYCAST: 535 case IPV6_LEAVE_ANYCAST: 536 { 537 struct ipv6_mreq mreq; 538 539 if (optlen < sizeof(struct ipv6_mreq)) 540 goto e_inval; 541 542 retv = -EFAULT; 543 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq))) 544 break; 545 546 if (optname == IPV6_JOIN_ANYCAST) 547 retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr); 548 else 549 retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr); 550 break; 551 } 552 case MCAST_JOIN_GROUP: 553 case MCAST_LEAVE_GROUP: 554 { 555 struct group_req greq; 556 struct sockaddr_in6 *psin6; 557 558 if (optlen < sizeof(struct group_req)) 559 goto e_inval; 560 561 retv = -EFAULT; 562 if (copy_from_user(&greq, optval, sizeof(struct group_req))) 563 break; 564 if (greq.gr_group.ss_family != AF_INET6) { 565 retv = -EADDRNOTAVAIL; 566 break; 567 } 568 psin6 = (struct sockaddr_in6 *)&greq.gr_group; 569 if (optname == MCAST_JOIN_GROUP) 570 retv = ipv6_sock_mc_join(sk, greq.gr_interface, 571 &psin6->sin6_addr); 572 else 573 retv = ipv6_sock_mc_drop(sk, greq.gr_interface, 574 &psin6->sin6_addr); 575 break; 576 } 577 case MCAST_JOIN_SOURCE_GROUP: 578 case MCAST_LEAVE_SOURCE_GROUP: 579 case MCAST_BLOCK_SOURCE: 580 case MCAST_UNBLOCK_SOURCE: 581 { 582 struct group_source_req greqs; 583 int omode, add; 584 585 if (optlen < sizeof(struct group_source_req)) 586 goto e_inval; 587 if (copy_from_user(&greqs, optval, sizeof(greqs))) { 588 retv = -EFAULT; 589 break; 590 } 591 if (greqs.gsr_group.ss_family != AF_INET6 || 592 greqs.gsr_source.ss_family != AF_INET6) { 593 retv = -EADDRNOTAVAIL; 594 break; 595 } 596 if (optname == MCAST_BLOCK_SOURCE) { 597 omode = MCAST_EXCLUDE; 598 add = 1; 599 } else if (optname == MCAST_UNBLOCK_SOURCE) { 600 omode = MCAST_EXCLUDE; 601 add = 0; 602 } else if (optname == MCAST_JOIN_SOURCE_GROUP) { 603 struct sockaddr_in6 *psin6; 604 605 psin6 = (struct sockaddr_in6 *)&greqs.gsr_group; 606 retv = ipv6_sock_mc_join(sk, greqs.gsr_interface, 607 &psin6->sin6_addr); 608 /* prior join w/ different source is ok */ 609 if (retv && retv != -EADDRINUSE) 610 break; 611 omode = MCAST_INCLUDE; 612 add = 1; 613 } else /* MCAST_LEAVE_SOURCE_GROUP */ { 614 omode = MCAST_INCLUDE; 615 add = 0; 616 } 617 retv = ip6_mc_source(add, omode, sk, &greqs); 618 break; 619 } 620 case MCAST_MSFILTER: 621 { 622 extern int sysctl_mld_max_msf; 623 struct group_filter *gsf; 624 625 if (optlen < GROUP_FILTER_SIZE(0)) 626 goto e_inval; 627 if (optlen > sysctl_optmem_max) { 628 retv = -ENOBUFS; 629 break; 630 } 631 gsf = kmalloc(optlen,GFP_KERNEL); 632 if (!gsf) { 633 retv = -ENOBUFS; 634 break; 635 } 636 retv = -EFAULT; 637 if (copy_from_user(gsf, optval, optlen)) { 638 kfree(gsf); 639 break; 640 } 641 /* numsrc >= (4G-140)/128 overflow in 32 bits */ 642 if (gsf->gf_numsrc >= 0x1ffffffU || 643 gsf->gf_numsrc > sysctl_mld_max_msf) { 644 kfree(gsf); 645 retv = -ENOBUFS; 646 break; 647 } 648 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) { 649 kfree(gsf); 650 retv = -EINVAL; 651 break; 652 } 653 retv = ip6_mc_msfilter(sk, gsf); 654 kfree(gsf); 655 656 break; 657 } 658 case IPV6_ROUTER_ALERT: 659 if (optlen < sizeof(int)) 660 goto e_inval; 661 retv = ip6_ra_control(sk, val); 662 break; 663 case IPV6_MTU_DISCOVER: 664 if (optlen < sizeof(int)) 665 goto e_inval; 666 if (val<0 || val>3) 667 goto e_inval; 668 np->pmtudisc = val; 669 retv = 0; 670 break; 671 case IPV6_MTU: 672 if (optlen < sizeof(int)) 673 goto e_inval; 674 if (val && val < IPV6_MIN_MTU) 675 goto e_inval; 676 np->frag_size = val; 677 retv = 0; 678 break; 679 case IPV6_RECVERR: 680 if (optlen < sizeof(int)) 681 goto e_inval; 682 np->recverr = valbool; 683 if (!val) 684 skb_queue_purge(&sk->sk_error_queue); 685 retv = 0; 686 break; 687 case IPV6_FLOWINFO_SEND: 688 if (optlen < sizeof(int)) 689 goto e_inval; 690 np->sndflow = valbool; 691 retv = 0; 692 break; 693 case IPV6_FLOWLABEL_MGR: 694 retv = ipv6_flowlabel_opt(sk, optval, optlen); 695 break; 696 case IPV6_IPSEC_POLICY: 697 case IPV6_XFRM_POLICY: 698 retv = -EPERM; 699 if (!capable(CAP_NET_ADMIN)) 700 break; 701 retv = xfrm_user_policy(sk, optname, optval, optlen); 702 break; 703 704 case IPV6_ADDR_PREFERENCES: 705 { 706 unsigned int pref = 0; 707 unsigned int prefmask = ~0; 708 709 if (optlen < sizeof(int)) 710 goto e_inval; 711 712 retv = -EINVAL; 713 714 /* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */ 715 switch (val & (IPV6_PREFER_SRC_PUBLIC| 716 IPV6_PREFER_SRC_TMP| 717 IPV6_PREFER_SRC_PUBTMP_DEFAULT)) { 718 case IPV6_PREFER_SRC_PUBLIC: 719 pref |= IPV6_PREFER_SRC_PUBLIC; 720 break; 721 case IPV6_PREFER_SRC_TMP: 722 pref |= IPV6_PREFER_SRC_TMP; 723 break; 724 case IPV6_PREFER_SRC_PUBTMP_DEFAULT: 725 break; 726 case 0: 727 goto pref_skip_pubtmp; 728 default: 729 goto e_inval; 730 } 731 732 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC| 733 IPV6_PREFER_SRC_TMP); 734 pref_skip_pubtmp: 735 736 /* check HOME/COA conflicts */ 737 switch (val & (IPV6_PREFER_SRC_HOME|IPV6_PREFER_SRC_COA)) { 738 case IPV6_PREFER_SRC_HOME: 739 break; 740 case IPV6_PREFER_SRC_COA: 741 pref |= IPV6_PREFER_SRC_COA; 742 case 0: 743 goto pref_skip_coa; 744 default: 745 goto e_inval; 746 } 747 748 prefmask &= ~IPV6_PREFER_SRC_COA; 749 pref_skip_coa: 750 751 /* check CGA/NONCGA conflicts */ 752 switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) { 753 case IPV6_PREFER_SRC_CGA: 754 case IPV6_PREFER_SRC_NONCGA: 755 case 0: 756 break; 757 default: 758 goto e_inval; 759 } 760 761 np->srcprefs = (np->srcprefs & prefmask) | pref; 762 retv = 0; 763 764 break; 765 } 766 } 767 768 release_sock(sk); 769 770 return retv; 771 772 e_inval: 773 release_sock(sk); 774 return -EINVAL; 775 } 776 777 int ipv6_setsockopt(struct sock *sk, int level, int optname, 778 char __user *optval, int optlen) 779 { 780 int err; 781 782 if (level == SOL_IP && sk->sk_type != SOCK_RAW) 783 return udp_prot.setsockopt(sk, level, optname, optval, optlen); 784 785 if (level != SOL_IPV6) 786 return -ENOPROTOOPT; 787 788 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen); 789 #ifdef CONFIG_NETFILTER 790 /* we need to exclude all possible ENOPROTOOPTs except default case */ 791 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY && 792 optname != IPV6_XFRM_POLICY) { 793 lock_sock(sk); 794 err = nf_setsockopt(sk, PF_INET6, optname, optval, 795 optlen); 796 release_sock(sk); 797 } 798 #endif 799 return err; 800 } 801 802 EXPORT_SYMBOL(ipv6_setsockopt); 803 804 #ifdef CONFIG_COMPAT 805 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname, 806 char __user *optval, int optlen) 807 { 808 int err; 809 810 if (level == SOL_IP && sk->sk_type != SOCK_RAW) { 811 if (udp_prot.compat_setsockopt != NULL) 812 return udp_prot.compat_setsockopt(sk, level, optname, 813 optval, optlen); 814 return udp_prot.setsockopt(sk, level, optname, optval, optlen); 815 } 816 817 if (level != SOL_IPV6) 818 return -ENOPROTOOPT; 819 820 if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER) 821 return compat_mc_setsockopt(sk, level, optname, optval, optlen, 822 ipv6_setsockopt); 823 824 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen); 825 #ifdef CONFIG_NETFILTER 826 /* we need to exclude all possible ENOPROTOOPTs except default case */ 827 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY && 828 optname != IPV6_XFRM_POLICY) { 829 lock_sock(sk); 830 err = compat_nf_setsockopt(sk, PF_INET6, optname, 831 optval, optlen); 832 release_sock(sk); 833 } 834 #endif 835 return err; 836 } 837 838 EXPORT_SYMBOL(compat_ipv6_setsockopt); 839 #endif 840 841 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt, 842 int optname, char __user *optval, int len) 843 { 844 struct ipv6_opt_hdr *hdr; 845 846 if (!opt) 847 return 0; 848 849 switch(optname) { 850 case IPV6_HOPOPTS: 851 hdr = opt->hopopt; 852 break; 853 case IPV6_RTHDRDSTOPTS: 854 hdr = opt->dst0opt; 855 break; 856 case IPV6_RTHDR: 857 hdr = (struct ipv6_opt_hdr *)opt->srcrt; 858 break; 859 case IPV6_DSTOPTS: 860 hdr = opt->dst1opt; 861 break; 862 default: 863 return -EINVAL; /* should not happen */ 864 } 865 866 if (!hdr) 867 return 0; 868 869 len = min_t(unsigned int, len, ipv6_optlen(hdr)); 870 if (copy_to_user(optval, hdr, len)) 871 return -EFAULT; 872 return len; 873 } 874 875 static int do_ipv6_getsockopt(struct sock *sk, int level, int optname, 876 char __user *optval, int __user *optlen) 877 { 878 struct ipv6_pinfo *np = inet6_sk(sk); 879 int len; 880 int val; 881 882 if (ip6_mroute_opt(optname)) 883 return ip6_mroute_getsockopt(sk, optname, optval, optlen); 884 885 if (get_user(len, optlen)) 886 return -EFAULT; 887 switch (optname) { 888 case IPV6_ADDRFORM: 889 if (sk->sk_protocol != IPPROTO_UDP && 890 sk->sk_protocol != IPPROTO_UDPLITE && 891 sk->sk_protocol != IPPROTO_TCP) 892 return -ENOPROTOOPT; 893 if (sk->sk_state != TCP_ESTABLISHED) 894 return -ENOTCONN; 895 val = sk->sk_family; 896 break; 897 case MCAST_MSFILTER: 898 { 899 struct group_filter gsf; 900 int err; 901 902 if (len < GROUP_FILTER_SIZE(0)) 903 return -EINVAL; 904 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) 905 return -EFAULT; 906 if (gsf.gf_group.ss_family != AF_INET6) 907 return -EADDRNOTAVAIL; 908 lock_sock(sk); 909 err = ip6_mc_msfget(sk, &gsf, 910 (struct group_filter __user *)optval, optlen); 911 release_sock(sk); 912 return err; 913 } 914 915 case IPV6_2292PKTOPTIONS: 916 { 917 struct msghdr msg; 918 struct sk_buff *skb; 919 920 if (sk->sk_type != SOCK_STREAM) 921 return -ENOPROTOOPT; 922 923 msg.msg_control = optval; 924 msg.msg_controllen = len; 925 msg.msg_flags = 0; 926 927 lock_sock(sk); 928 skb = np->pktoptions; 929 if (skb) 930 atomic_inc(&skb->users); 931 release_sock(sk); 932 933 if (skb) { 934 int err = datagram_recv_ctl(sk, &msg, skb); 935 kfree_skb(skb); 936 if (err) 937 return err; 938 } else { 939 if (np->rxopt.bits.rxinfo) { 940 struct in6_pktinfo src_info; 941 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif : 942 np->sticky_pktinfo.ipi6_ifindex; 943 np->mcast_oif? ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr) : 944 ipv6_addr_copy(&src_info.ipi6_addr, &(np->sticky_pktinfo.ipi6_addr)); 945 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info); 946 } 947 if (np->rxopt.bits.rxhlim) { 948 int hlim = np->mcast_hops; 949 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim); 950 } 951 if (np->rxopt.bits.rxoinfo) { 952 struct in6_pktinfo src_info; 953 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif : 954 np->sticky_pktinfo.ipi6_ifindex; 955 np->mcast_oif? ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr) : 956 ipv6_addr_copy(&src_info.ipi6_addr, &(np->sticky_pktinfo.ipi6_addr)); 957 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info); 958 } 959 if (np->rxopt.bits.rxohlim) { 960 int hlim = np->mcast_hops; 961 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim); 962 } 963 } 964 len -= msg.msg_controllen; 965 return put_user(len, optlen); 966 } 967 case IPV6_MTU: 968 { 969 struct dst_entry *dst; 970 val = 0; 971 lock_sock(sk); 972 dst = sk_dst_get(sk); 973 if (dst) { 974 val = dst_mtu(dst); 975 dst_release(dst); 976 } 977 release_sock(sk); 978 if (!val) 979 return -ENOTCONN; 980 break; 981 } 982 983 case IPV6_V6ONLY: 984 val = np->ipv6only; 985 break; 986 987 case IPV6_RECVPKTINFO: 988 val = np->rxopt.bits.rxinfo; 989 break; 990 991 case IPV6_2292PKTINFO: 992 val = np->rxopt.bits.rxoinfo; 993 break; 994 995 case IPV6_RECVHOPLIMIT: 996 val = np->rxopt.bits.rxhlim; 997 break; 998 999 case IPV6_2292HOPLIMIT: 1000 val = np->rxopt.bits.rxohlim; 1001 break; 1002 1003 case IPV6_RECVRTHDR: 1004 val = np->rxopt.bits.srcrt; 1005 break; 1006 1007 case IPV6_2292RTHDR: 1008 val = np->rxopt.bits.osrcrt; 1009 break; 1010 1011 case IPV6_HOPOPTS: 1012 case IPV6_RTHDRDSTOPTS: 1013 case IPV6_RTHDR: 1014 case IPV6_DSTOPTS: 1015 { 1016 1017 lock_sock(sk); 1018 len = ipv6_getsockopt_sticky(sk, np->opt, 1019 optname, optval, len); 1020 release_sock(sk); 1021 /* check if ipv6_getsockopt_sticky() returns err code */ 1022 if (len < 0) 1023 return len; 1024 return put_user(len, optlen); 1025 } 1026 1027 case IPV6_RECVHOPOPTS: 1028 val = np->rxopt.bits.hopopts; 1029 break; 1030 1031 case IPV6_2292HOPOPTS: 1032 val = np->rxopt.bits.ohopopts; 1033 break; 1034 1035 case IPV6_RECVDSTOPTS: 1036 val = np->rxopt.bits.dstopts; 1037 break; 1038 1039 case IPV6_2292DSTOPTS: 1040 val = np->rxopt.bits.odstopts; 1041 break; 1042 1043 case IPV6_TCLASS: 1044 val = np->tclass; 1045 if (val < 0) 1046 val = 0; 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