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 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 np->tclass = val; 319 retv = 0; 320 break; 321 322 case IPV6_RECVTCLASS: 323 if (optlen < sizeof(int)) 324 goto e_inval; 325 np->rxopt.bits.rxtclass = valbool; 326 retv = 0; 327 break; 328 329 case IPV6_FLOWINFO: 330 if (optlen < sizeof(int)) 331 goto e_inval; 332 np->rxopt.bits.rxflow = valbool; 333 retv = 0; 334 break; 335 336 case IPV6_HOPOPTS: 337 case IPV6_RTHDRDSTOPTS: 338 case IPV6_RTHDR: 339 case IPV6_DSTOPTS: 340 { 341 struct ipv6_txoptions *opt; 342 343 /* remove any sticky options header with a zero option 344 * length, per RFC3542. 345 */ 346 if (optlen == 0) 347 optval = NULL; 348 else if (optval == NULL) 349 goto e_inval; 350 else if (optlen < sizeof(struct ipv6_opt_hdr) || 351 optlen & 0x7 || optlen > 8 * 255) 352 goto e_inval; 353 354 /* hop-by-hop / destination options are privileged option */ 355 retv = -EPERM; 356 if (optname != IPV6_RTHDR && !capable(CAP_NET_RAW)) 357 break; 358 359 opt = ipv6_renew_options(sk, np->opt, optname, 360 (struct ipv6_opt_hdr __user *)optval, 361 optlen); 362 if (IS_ERR(opt)) { 363 retv = PTR_ERR(opt); 364 break; 365 } 366 367 /* routing header option needs extra check */ 368 retv = -EINVAL; 369 if (optname == IPV6_RTHDR && opt && opt->srcrt) { 370 struct ipv6_rt_hdr *rthdr = opt->srcrt; 371 switch (rthdr->type) { 372 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 373 case IPV6_SRCRT_TYPE_2: 374 if (rthdr->hdrlen != 2 || 375 rthdr->segments_left != 1) 376 goto sticky_done; 377 378 break; 379 #endif 380 default: 381 goto sticky_done; 382 } 383 384 if ((rthdr->hdrlen & 1) || 385 (rthdr->hdrlen >> 1) != rthdr->segments_left) 386 goto sticky_done; 387 } 388 389 retv = 0; 390 opt = ipv6_update_options(sk, opt); 391 sticky_done: 392 if (opt) 393 sock_kfree_s(sk, opt, opt->tot_len); 394 break; 395 } 396 397 case IPV6_PKTINFO: 398 { 399 struct in6_pktinfo pkt; 400 401 if (optlen == 0) 402 goto e_inval; 403 else if (optlen < sizeof(struct in6_pktinfo) || optval == NULL) 404 goto e_inval; 405 406 if (copy_from_user(&pkt, optval, sizeof(struct in6_pktinfo))) { 407 retv = -EFAULT; 408 break; 409 } 410 if (sk->sk_bound_dev_if && pkt.ipi6_ifindex != sk->sk_bound_dev_if) 411 goto e_inval; 412 413 np->sticky_pktinfo.ipi6_ifindex = pkt.ipi6_ifindex; 414 ipv6_addr_copy(&np->sticky_pktinfo.ipi6_addr, &pkt.ipi6_addr); 415 retv = 0; 416 break; 417 } 418 419 case IPV6_2292PKTOPTIONS: 420 { 421 struct ipv6_txoptions *opt = NULL; 422 struct msghdr msg; 423 struct flowi fl; 424 int junk; 425 426 fl.fl6_flowlabel = 0; 427 fl.oif = sk->sk_bound_dev_if; 428 429 if (optlen == 0) 430 goto update; 431 432 /* 1K is probably excessive 433 * 1K is surely not enough, 2K per standard header is 16K. 434 */ 435 retv = -EINVAL; 436 if (optlen > 64*1024) 437 break; 438 439 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL); 440 retv = -ENOBUFS; 441 if (opt == NULL) 442 break; 443 444 memset(opt, 0, sizeof(*opt)); 445 opt->tot_len = sizeof(*opt) + optlen; 446 retv = -EFAULT; 447 if (copy_from_user(opt+1, optval, optlen)) 448 goto done; 449 450 msg.msg_controllen = optlen; 451 msg.msg_control = (void*)(opt+1); 452 453 retv = datagram_send_ctl(net, &msg, &fl, opt, &junk, &junk); 454 if (retv) 455 goto done; 456 update: 457 retv = 0; 458 opt = ipv6_update_options(sk, opt); 459 done: 460 if (opt) 461 sock_kfree_s(sk, opt, opt->tot_len); 462 break; 463 } 464 case IPV6_UNICAST_HOPS: 465 if (optlen < sizeof(int)) 466 goto e_inval; 467 if (val > 255 || val < -1) 468 goto e_inval; 469 np->hop_limit = val; 470 retv = 0; 471 break; 472 473 case IPV6_MULTICAST_HOPS: 474 if (sk->sk_type == SOCK_STREAM) 475 break; 476 if (optlen < sizeof(int)) 477 goto e_inval; 478 if (val > 255 || val < -1) 479 goto e_inval; 480 np->mcast_hops = val; 481 retv = 0; 482 break; 483 484 case IPV6_MULTICAST_LOOP: 485 if (optlen < sizeof(int)) 486 goto e_inval; 487 if (val != valbool) 488 goto e_inval; 489 np->mc_loop = valbool; 490 retv = 0; 491 break; 492 493 case IPV6_MULTICAST_IF: 494 if (sk->sk_type == SOCK_STREAM) 495 break; 496 if (optlen < sizeof(int)) 497 goto e_inval; 498 499 if (val) { 500 if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != val) 501 goto e_inval; 502 503 if (__dev_get_by_index(net, val) == NULL) { 504 retv = -ENODEV; 505 break; 506 } 507 } 508 np->mcast_oif = val; 509 retv = 0; 510 break; 511 case IPV6_ADD_MEMBERSHIP: 512 case IPV6_DROP_MEMBERSHIP: 513 { 514 struct ipv6_mreq mreq; 515 516 if (optlen < sizeof(struct ipv6_mreq)) 517 goto e_inval; 518 519 retv = -EPROTO; 520 if (inet_sk(sk)->is_icsk) 521 break; 522 523 retv = -EFAULT; 524 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq))) 525 break; 526 527 if (optname == IPV6_ADD_MEMBERSHIP) 528 retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr); 529 else 530 retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr); 531 break; 532 } 533 case IPV6_JOIN_ANYCAST: 534 case IPV6_LEAVE_ANYCAST: 535 { 536 struct ipv6_mreq mreq; 537 538 if (optlen < sizeof(struct ipv6_mreq)) 539 goto e_inval; 540 541 retv = -EFAULT; 542 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq))) 543 break; 544 545 if (optname == IPV6_JOIN_ANYCAST) 546 retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr); 547 else 548 retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr); 549 break; 550 } 551 case MCAST_JOIN_GROUP: 552 case MCAST_LEAVE_GROUP: 553 { 554 struct group_req greq; 555 struct sockaddr_in6 *psin6; 556 557 if (optlen < sizeof(struct group_req)) 558 goto e_inval; 559 560 retv = -EFAULT; 561 if (copy_from_user(&greq, optval, sizeof(struct group_req))) 562 break; 563 if (greq.gr_group.ss_family != AF_INET6) { 564 retv = -EADDRNOTAVAIL; 565 break; 566 } 567 psin6 = (struct sockaddr_in6 *)&greq.gr_group; 568 if (optname == MCAST_JOIN_GROUP) 569 retv = ipv6_sock_mc_join(sk, greq.gr_interface, 570 &psin6->sin6_addr); 571 else 572 retv = ipv6_sock_mc_drop(sk, greq.gr_interface, 573 &psin6->sin6_addr); 574 break; 575 } 576 case MCAST_JOIN_SOURCE_GROUP: 577 case MCAST_LEAVE_SOURCE_GROUP: 578 case MCAST_BLOCK_SOURCE: 579 case MCAST_UNBLOCK_SOURCE: 580 { 581 struct group_source_req greqs; 582 int omode, add; 583 584 if (optlen < sizeof(struct group_source_req)) 585 goto e_inval; 586 if (copy_from_user(&greqs, optval, sizeof(greqs))) { 587 retv = -EFAULT; 588 break; 589 } 590 if (greqs.gsr_group.ss_family != AF_INET6 || 591 greqs.gsr_source.ss_family != AF_INET6) { 592 retv = -EADDRNOTAVAIL; 593 break; 594 } 595 if (optname == MCAST_BLOCK_SOURCE) { 596 omode = MCAST_EXCLUDE; 597 add = 1; 598 } else if (optname == MCAST_UNBLOCK_SOURCE) { 599 omode = MCAST_EXCLUDE; 600 add = 0; 601 } else if (optname == MCAST_JOIN_SOURCE_GROUP) { 602 struct sockaddr_in6 *psin6; 603 604 psin6 = (struct sockaddr_in6 *)&greqs.gsr_group; 605 retv = ipv6_sock_mc_join(sk, greqs.gsr_interface, 606 &psin6->sin6_addr); 607 /* prior join w/ different source is ok */ 608 if (retv && retv != -EADDRINUSE) 609 break; 610 omode = MCAST_INCLUDE; 611 add = 1; 612 } else /* MCAST_LEAVE_SOURCE_GROUP */ { 613 omode = MCAST_INCLUDE; 614 add = 0; 615 } 616 retv = ip6_mc_source(add, omode, sk, &greqs); 617 break; 618 } 619 case MCAST_MSFILTER: 620 { 621 extern int sysctl_mld_max_msf; 622 struct group_filter *gsf; 623 624 if (optlen < GROUP_FILTER_SIZE(0)) 625 goto e_inval; 626 if (optlen > sysctl_optmem_max) { 627 retv = -ENOBUFS; 628 break; 629 } 630 gsf = kmalloc(optlen,GFP_KERNEL); 631 if (!gsf) { 632 retv = -ENOBUFS; 633 break; 634 } 635 retv = -EFAULT; 636 if (copy_from_user(gsf, optval, optlen)) { 637 kfree(gsf); 638 break; 639 } 640 /* numsrc >= (4G-140)/128 overflow in 32 bits */ 641 if (gsf->gf_numsrc >= 0x1ffffffU || 642 gsf->gf_numsrc > sysctl_mld_max_msf) { 643 kfree(gsf); 644 retv = -ENOBUFS; 645 break; 646 } 647 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) { 648 kfree(gsf); 649 retv = -EINVAL; 650 break; 651 } 652 retv = ip6_mc_msfilter(sk, gsf); 653 kfree(gsf); 654 655 break; 656 } 657 case IPV6_ROUTER_ALERT: 658 if (optlen < sizeof(int)) 659 goto e_inval; 660 retv = ip6_ra_control(sk, val); 661 break; 662 case IPV6_MTU_DISCOVER: 663 if (optlen < sizeof(int)) 664 goto e_inval; 665 if (val<0 || val>3) 666 goto e_inval; 667 np->pmtudisc = val; 668 retv = 0; 669 break; 670 case IPV6_MTU: 671 if (optlen < sizeof(int)) 672 goto e_inval; 673 if (val && val < IPV6_MIN_MTU) 674 goto e_inval; 675 np->frag_size = val; 676 retv = 0; 677 break; 678 case IPV6_RECVERR: 679 if (optlen < sizeof(int)) 680 goto e_inval; 681 np->recverr = valbool; 682 if (!val) 683 skb_queue_purge(&sk->sk_error_queue); 684 retv = 0; 685 break; 686 case IPV6_FLOWINFO_SEND: 687 if (optlen < sizeof(int)) 688 goto e_inval; 689 np->sndflow = valbool; 690 retv = 0; 691 break; 692 case IPV6_FLOWLABEL_MGR: 693 retv = ipv6_flowlabel_opt(sk, optval, optlen); 694 break; 695 case IPV6_IPSEC_POLICY: 696 case IPV6_XFRM_POLICY: 697 retv = -EPERM; 698 if (!capable(CAP_NET_ADMIN)) 699 break; 700 retv = xfrm_user_policy(sk, optname, optval, optlen); 701 break; 702 703 case IPV6_ADDR_PREFERENCES: 704 { 705 unsigned int pref = 0; 706 unsigned int prefmask = ~0; 707 708 if (optlen < sizeof(int)) 709 goto e_inval; 710 711 retv = -EINVAL; 712 713 /* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */ 714 switch (val & (IPV6_PREFER_SRC_PUBLIC| 715 IPV6_PREFER_SRC_TMP| 716 IPV6_PREFER_SRC_PUBTMP_DEFAULT)) { 717 case IPV6_PREFER_SRC_PUBLIC: 718 pref |= IPV6_PREFER_SRC_PUBLIC; 719 break; 720 case IPV6_PREFER_SRC_TMP: 721 pref |= IPV6_PREFER_SRC_TMP; 722 break; 723 case IPV6_PREFER_SRC_PUBTMP_DEFAULT: 724 break; 725 case 0: 726 goto pref_skip_pubtmp; 727 default: 728 goto e_inval; 729 } 730 731 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC| 732 IPV6_PREFER_SRC_TMP); 733 pref_skip_pubtmp: 734 735 /* check HOME/COA conflicts */ 736 switch (val & (IPV6_PREFER_SRC_HOME|IPV6_PREFER_SRC_COA)) { 737 case IPV6_PREFER_SRC_HOME: 738 break; 739 case IPV6_PREFER_SRC_COA: 740 pref |= IPV6_PREFER_SRC_COA; 741 case 0: 742 goto pref_skip_coa; 743 default: 744 goto e_inval; 745 } 746 747 prefmask &= ~IPV6_PREFER_SRC_COA; 748 pref_skip_coa: 749 750 /* check CGA/NONCGA conflicts */ 751 switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) { 752 case IPV6_PREFER_SRC_CGA: 753 case IPV6_PREFER_SRC_NONCGA: 754 case 0: 755 break; 756 default: 757 goto e_inval; 758 } 759 760 np->srcprefs = (np->srcprefs & prefmask) | pref; 761 retv = 0; 762 763 break; 764 } 765 } 766 767 release_sock(sk); 768 769 return retv; 770 771 e_inval: 772 release_sock(sk); 773 return -EINVAL; 774 } 775 776 int ipv6_setsockopt(struct sock *sk, int level, int optname, 777 char __user *optval, int optlen) 778 { 779 int err; 780 781 if (level == SOL_IP && sk->sk_type != SOCK_RAW) 782 return udp_prot.setsockopt(sk, level, optname, optval, optlen); 783 784 if (level != SOL_IPV6) 785 return -ENOPROTOOPT; 786 787 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen); 788 #ifdef CONFIG_NETFILTER 789 /* we need to exclude all possible ENOPROTOOPTs except default case */ 790 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY && 791 optname != IPV6_XFRM_POLICY) { 792 lock_sock(sk); 793 err = nf_setsockopt(sk, PF_INET6, optname, optval, 794 optlen); 795 release_sock(sk); 796 } 797 #endif 798 return err; 799 } 800 801 EXPORT_SYMBOL(ipv6_setsockopt); 802 803 #ifdef CONFIG_COMPAT 804 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname, 805 char __user *optval, int optlen) 806 { 807 int err; 808 809 if (level == SOL_IP && sk->sk_type != SOCK_RAW) { 810 if (udp_prot.compat_setsockopt != NULL) 811 return udp_prot.compat_setsockopt(sk, level, optname, 812 optval, optlen); 813 return udp_prot.setsockopt(sk, level, optname, optval, optlen); 814 } 815 816 if (level != SOL_IPV6) 817 return -ENOPROTOOPT; 818 819 if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER) 820 return compat_mc_setsockopt(sk, level, optname, optval, optlen, 821 ipv6_setsockopt); 822 823 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen); 824 #ifdef CONFIG_NETFILTER 825 /* we need to exclude all possible ENOPROTOOPTs except default case */ 826 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY && 827 optname != IPV6_XFRM_POLICY) { 828 lock_sock(sk); 829 err = compat_nf_setsockopt(sk, PF_INET6, optname, 830 optval, optlen); 831 release_sock(sk); 832 } 833 #endif 834 return err; 835 } 836 837 EXPORT_SYMBOL(compat_ipv6_setsockopt); 838 #endif 839 840 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt, 841 int optname, char __user *optval, int len) 842 { 843 struct ipv6_opt_hdr *hdr; 844 845 if (!opt) 846 return 0; 847 848 switch(optname) { 849 case IPV6_HOPOPTS: 850 hdr = opt->hopopt; 851 break; 852 case IPV6_RTHDRDSTOPTS: 853 hdr = opt->dst0opt; 854 break; 855 case IPV6_RTHDR: 856 hdr = (struct ipv6_opt_hdr *)opt->srcrt; 857 break; 858 case IPV6_DSTOPTS: 859 hdr = opt->dst1opt; 860 break; 861 default: 862 return -EINVAL; /* should not happen */ 863 } 864 865 if (!hdr) 866 return 0; 867 868 len = min_t(unsigned int, len, ipv6_optlen(hdr)); 869 if (copy_to_user(optval, hdr, len)) 870 return -EFAULT; 871 return len; 872 } 873 874 static int do_ipv6_getsockopt(struct sock *sk, int level, int optname, 875 char __user *optval, int __user *optlen) 876 { 877 struct ipv6_pinfo *np = inet6_sk(sk); 878 int len; 879 int val; 880 881 if (ip6_mroute_opt(optname)) 882 return ip6_mroute_getsockopt(sk, optname, optval, optlen); 883 884 if (get_user(len, optlen)) 885 return -EFAULT; 886 switch (optname) { 887 case IPV6_ADDRFORM: 888 if (sk->sk_protocol != IPPROTO_UDP && 889 sk->sk_protocol != IPPROTO_UDPLITE && 890 sk->sk_protocol != IPPROTO_TCP) 891 return -ENOPROTOOPT; 892 if (sk->sk_state != TCP_ESTABLISHED) 893 return -ENOTCONN; 894 val = sk->sk_family; 895 break; 896 case MCAST_MSFILTER: 897 { 898 struct group_filter gsf; 899 int err; 900 901 if (len < GROUP_FILTER_SIZE(0)) 902 return -EINVAL; 903 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) 904 return -EFAULT; 905 if (gsf.gf_group.ss_family != AF_INET6) 906 return -EADDRNOTAVAIL; 907 lock_sock(sk); 908 err = ip6_mc_msfget(sk, &gsf, 909 (struct group_filter __user *)optval, optlen); 910 release_sock(sk); 911 return err; 912 } 913 914 case IPV6_2292PKTOPTIONS: 915 { 916 struct msghdr msg; 917 struct sk_buff *skb; 918 919 if (sk->sk_type != SOCK_STREAM) 920 return -ENOPROTOOPT; 921 922 msg.msg_control = optval; 923 msg.msg_controllen = len; 924 msg.msg_flags = 0; 925 926 lock_sock(sk); 927 skb = np->pktoptions; 928 if (skb) 929 atomic_inc(&skb->users); 930 release_sock(sk); 931 932 if (skb) { 933 int err = datagram_recv_ctl(sk, &msg, skb); 934 kfree_skb(skb); 935 if (err) 936 return err; 937 } else { 938 if (np->rxopt.bits.rxinfo) { 939 struct in6_pktinfo src_info; 940 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif : 941 np->sticky_pktinfo.ipi6_ifindex; 942 np->mcast_oif? ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr) : 943 ipv6_addr_copy(&src_info.ipi6_addr, &(np->sticky_pktinfo.ipi6_addr)); 944 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info); 945 } 946 if (np->rxopt.bits.rxhlim) { 947 int hlim = np->mcast_hops; 948 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim); 949 } 950 if (np->rxopt.bits.rxoinfo) { 951 struct in6_pktinfo src_info; 952 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif : 953 np->sticky_pktinfo.ipi6_ifindex; 954 np->mcast_oif? ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr) : 955 ipv6_addr_copy(&src_info.ipi6_addr, &(np->sticky_pktinfo.ipi6_addr)); 956 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info); 957 } 958 if (np->rxopt.bits.rxohlim) { 959 int hlim = np->mcast_hops; 960 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim); 961 } 962 } 963 len -= msg.msg_controllen; 964 return put_user(len, optlen); 965 } 966 case IPV6_MTU: 967 { 968 struct dst_entry *dst; 969 val = 0; 970 lock_sock(sk); 971 dst = sk_dst_get(sk); 972 if (dst) { 973 val = dst_mtu(dst); 974 dst_release(dst); 975 } 976 release_sock(sk); 977 if (!val) 978 return -ENOTCONN; 979 break; 980 } 981 982 case IPV6_V6ONLY: 983 val = np->ipv6only; 984 break; 985 986 case IPV6_RECVPKTINFO: 987 val = np->rxopt.bits.rxinfo; 988 break; 989 990 case IPV6_2292PKTINFO: 991 val = np->rxopt.bits.rxoinfo; 992 break; 993 994 case IPV6_RECVHOPLIMIT: 995 val = np->rxopt.bits.rxhlim; 996 break; 997 998 case IPV6_2292HOPLIMIT: 999 val = np->rxopt.bits.rxohlim; 1000 break; 1001 1002 case IPV6_RECVRTHDR: 1003 val = np->rxopt.bits.srcrt; 1004 break; 1005 1006 case IPV6_2292RTHDR: 1007 val = np->rxopt.bits.osrcrt; 1008 break; 1009 1010 case IPV6_HOPOPTS: 1011 case IPV6_RTHDRDSTOPTS: 1012 case IPV6_RTHDR: 1013 case IPV6_DSTOPTS: 1014 { 1015 1016 lock_sock(sk); 1017 len = ipv6_getsockopt_sticky(sk, np->opt, 1018 optname, optval, len); 1019 release_sock(sk); 1020 /* check if ipv6_getsockopt_sticky() returns err code */ 1021 if (len < 0) 1022 return len; 1023 return put_user(len, optlen); 1024 } 1025 1026 case IPV6_RECVHOPOPTS: 1027 val = np->rxopt.bits.hopopts; 1028 break; 1029 1030 case IPV6_2292HOPOPTS: 1031 val = np->rxopt.bits.ohopopts; 1032 break; 1033 1034 case IPV6_RECVDSTOPTS: 1035 val = np->rxopt.bits.dstopts; 1036 break; 1037 1038 case IPV6_2292DSTOPTS: 1039 val = np->rxopt.bits.odstopts; 1040 break; 1041 1042 case IPV6_TCLASS: 1043 val = np->tclass; 1044 if (val < 0) 1045 val = 0; 1046 break; 1047 1048 case IPV6_RECVTCLASS: 1049 val = np->rxopt.bits.rxtclass; 1050 break; 1051 1052 case IPV6_FLOWINFO: 1053 val = np->rxopt.bits.rxflow; 1054 break; 1055 1056 case IPV6_UNICAST_HOPS: 1057 case IPV6_MULTICAST_HOPS: 1058 { 1059 struct dst_entry *dst; 1060 1061 if (optname == IPV6_UNICAST_HOPS) 1062 val = np->hop_limit; 1063 else 1064 val = np->mcast_hops; 1065 1066 dst = sk_dst_get(sk); 1067 if (dst) { 1068 if (val < 0) 1069 val = ip6_dst_hoplimit(dst); 1070 dst_release(dst); 1071 } 1072 if (val < 0) 1073 val = sock_net(sk)->ipv6.devconf_all->hop_limit; 1074 break; 1075 } 1076 1077 case IPV6_MULTICAST_LOOP: 1078 val = np->mc_loop; 1079 break; 1080 1081 case IPV6_MULTICAST_IF: 1082 val = np->mcast_oif; 1083 break; 1084 1085 case IPV6_MTU_DISCOVER: 1086 val = np->pmtudisc; 1087 break; 1088 1089 case IPV6_RECVERR: 1090 val = np->recverr; 1091 break; 1092 1093 case IPV6_FLOWINFO_SEND: 1094 val = np->sndflow; 1095 break; 1096 1097 case IPV6_ADDR_PREFERENCES: 1098 val = 0; 1099 1100 if (np->srcprefs & IPV6_PREFER_SRC_TMP) 1101 val |= IPV6_PREFER_SRC_TMP; 1102 else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC) 1103 val |= IPV6_PREFER_SRC_PUBLIC; 1104 else { 1105 /* XXX: should we return system default? */ 1106 val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT; 1107 } 1108 1109 if (np->srcprefs & IPV6_PREFER_SRC_COA) 1110 val |= IPV6_PREFER_SRC_COA; 1111 else 1112 val |= IPV6_PREFER_SRC_HOME; 1113 break; 1114 1115 default: 1116 return -ENOPROTOOPT; 1117 } 1118 len = min_t(unsigned int, sizeof(int), len); 1119 if(put_user(len, optlen)) 1120 return -EFAULT; 1121 if(copy_to_user(optval,&val,len)) 1122 return -EFAULT; 1123 return 0; 1124 } 1125 1126 int ipv6_getsockopt(struct sock *sk, int level, int optname, 1127 char __user *optval, int __user *optlen) 1128 { 1129 int err; 1130 1131 if (level == SOL_IP && sk->sk_type != SOCK_RAW) 1132 return udp_prot.getsockopt(sk, level, optname, optval, optlen); 1133 1134 if(level != SOL_IPV6) 1135 return -ENOPROTOOPT; 1136 1137 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen); 1138 #ifdef CONFIG_NETFILTER 1139 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1140 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) { 1141 int len; 1142 1143 if (get_user(len, optlen)) 1144 return -EFAULT; 1145 1146 lock_sock(sk); 1147 err = nf_getsockopt(sk, PF_INET6, optname, optval, 1148 &len); 1149 release_sock(sk); 1150 if (err >= 0) 1151 err = put_user(len, optlen); 1152 } 1153 #endif 1154 return err; 1155 } 1156 1157 EXPORT_SYMBOL(ipv6_getsockopt); 1158 1159 #ifdef CONFIG_COMPAT 1160 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname, 1161 char __user *optval, int __user *optlen) 1162 { 1163 int err; 1164 1165 if (level == SOL_IP && sk->sk_type != SOCK_RAW) { 1166 if (udp_prot.compat_getsockopt != NULL) 1167 return udp_prot.compat_getsockopt(sk, level, optname, 1168 optval, optlen); 1169 return udp_prot.getsockopt(sk, level, optname, optval, optlen); 1170 } 1171 1172 if (level != SOL_IPV6) 1173 return -ENOPROTOOPT; 1174 1175 if (optname == MCAST_MSFILTER) 1176 return compat_mc_getsockopt(sk, level, optname, optval, optlen, 1177 ipv6_getsockopt); 1178 1179 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen); 1180 #ifdef CONFIG_NETFILTER 1181 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1182 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) { 1183 int len; 1184 1185 if (get_user(len, optlen)) 1186 return -EFAULT; 1187 1188 lock_sock(sk); 1189 err = compat_nf_getsockopt(sk, PF_INET6, 1190 optname, optval, &len); 1191 release_sock(sk); 1192 if (err >= 0) 1193 err = put_user(len, optlen); 1194 } 1195 #endif 1196 return err; 1197 } 1198 1199 EXPORT_SYMBOL(compat_ipv6_getsockopt); 1200 #endif 1201 1202