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 * $Id: ipv6_sockglue.c,v 1.41 2002/02/01 22:01:04 davem Exp $ 11 * 12 * This program is free software; you can redistribute it and/or 13 * modify it under the terms of the GNU General Public License 14 * as published by the Free Software Foundation; either version 15 * 2 of the License, or (at your option) any later version. 16 * 17 * FIXME: Make the setsockopt code POSIX compliant: That is 18 * 19 * o Return -EINVAL for setsockopt of short lengths 20 * o Truncate getsockopt returns 21 * o Return an optlen of the truncated length if need be 22 * 23 * Changes: 24 * David L Stevens <dlstevens@us.ibm.com>: 25 * - added multicast source filtering API for MLDv2 26 */ 27 28 #include <linux/module.h> 29 #include <linux/config.h> 30 #include <linux/errno.h> 31 #include <linux/types.h> 32 #include <linux/socket.h> 33 #include <linux/sockios.h> 34 #include <linux/sched.h> 35 #include <linux/net.h> 36 #include <linux/in6.h> 37 #include <linux/netdevice.h> 38 #include <linux/if_arp.h> 39 #include <linux/init.h> 40 #include <linux/sysctl.h> 41 #include <linux/netfilter.h> 42 43 #include <net/sock.h> 44 #include <net/snmp.h> 45 #include <net/ipv6.h> 46 #include <net/ndisc.h> 47 #include <net/protocol.h> 48 #include <net/transp_v6.h> 49 #include <net/ip6_route.h> 50 #include <net/addrconf.h> 51 #include <net/inet_common.h> 52 #include <net/tcp.h> 53 #include <net/udp.h> 54 #include <net/xfrm.h> 55 56 #include <asm/uaccess.h> 57 58 DEFINE_SNMP_STAT(struct ipstats_mib, ipv6_statistics) __read_mostly; 59 60 static struct packet_type ipv6_packet_type = { 61 .type = __constant_htons(ETH_P_IPV6), 62 .func = ipv6_rcv, 63 }; 64 65 struct ip6_ra_chain *ip6_ra_chain; 66 DEFINE_RWLOCK(ip6_ra_lock); 67 68 int ip6_ra_control(struct sock *sk, int sel, void (*destructor)(struct sock *)) 69 { 70 struct ip6_ra_chain *ra, *new_ra, **rap; 71 72 /* RA packet may be delivered ONLY to IPPROTO_RAW socket */ 73 if (sk->sk_type != SOCK_RAW || inet_sk(sk)->num != IPPROTO_RAW) 74 return -EINVAL; 75 76 new_ra = (sel>=0) ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL; 77 78 write_lock_bh(&ip6_ra_lock); 79 for (rap = &ip6_ra_chain; (ra=*rap) != NULL; rap = &ra->next) { 80 if (ra->sk == sk) { 81 if (sel>=0) { 82 write_unlock_bh(&ip6_ra_lock); 83 if (new_ra) 84 kfree(new_ra); 85 return -EADDRINUSE; 86 } 87 88 *rap = ra->next; 89 write_unlock_bh(&ip6_ra_lock); 90 91 if (ra->destructor) 92 ra->destructor(sk); 93 sock_put(sk); 94 kfree(ra); 95 return 0; 96 } 97 } 98 if (new_ra == NULL) { 99 write_unlock_bh(&ip6_ra_lock); 100 return -ENOBUFS; 101 } 102 new_ra->sk = sk; 103 new_ra->sel = sel; 104 new_ra->destructor = destructor; 105 new_ra->next = ra; 106 *rap = new_ra; 107 sock_hold(sk); 108 write_unlock_bh(&ip6_ra_lock); 109 return 0; 110 } 111 112 int ipv6_setsockopt(struct sock *sk, int level, int optname, 113 char __user *optval, int optlen) 114 { 115 struct ipv6_pinfo *np = inet6_sk(sk); 116 int val, valbool; 117 int retv = -ENOPROTOOPT; 118 119 if (level == SOL_IP && sk->sk_type != SOCK_RAW) 120 return udp_prot.setsockopt(sk, level, optname, optval, optlen); 121 122 if(level!=SOL_IPV6) 123 goto out; 124 125 if (optval == NULL) 126 val=0; 127 else if (get_user(val, (int __user *) optval)) 128 return -EFAULT; 129 130 valbool = (val!=0); 131 132 lock_sock(sk); 133 134 switch (optname) { 135 136 case IPV6_ADDRFORM: 137 if (val == PF_INET) { 138 struct ipv6_txoptions *opt; 139 struct sk_buff *pktopt; 140 141 if (sk->sk_protocol != IPPROTO_UDP && 142 sk->sk_protocol != IPPROTO_TCP) 143 break; 144 145 if (sk->sk_state != TCP_ESTABLISHED) { 146 retv = -ENOTCONN; 147 break; 148 } 149 150 if (ipv6_only_sock(sk) || 151 !(ipv6_addr_type(&np->daddr) & IPV6_ADDR_MAPPED)) { 152 retv = -EADDRNOTAVAIL; 153 break; 154 } 155 156 fl6_free_socklist(sk); 157 ipv6_sock_mc_close(sk); 158 159 /* 160 * Sock is moving from IPv6 to IPv4 (sk_prot), so 161 * remove it from the refcnt debug socks count in the 162 * original family... 163 */ 164 sk_refcnt_debug_dec(sk); 165 166 if (sk->sk_protocol == IPPROTO_TCP) { 167 struct tcp_sock *tp = tcp_sk(sk); 168 169 local_bh_disable(); 170 sock_prot_dec_use(sk->sk_prot); 171 sock_prot_inc_use(&tcp_prot); 172 local_bh_enable(); 173 sk->sk_prot = &tcp_prot; 174 tp->af_specific = &ipv4_specific; 175 sk->sk_socket->ops = &inet_stream_ops; 176 sk->sk_family = PF_INET; 177 tcp_sync_mss(sk, tp->pmtu_cookie); 178 } else { 179 local_bh_disable(); 180 sock_prot_dec_use(sk->sk_prot); 181 sock_prot_inc_use(&udp_prot); 182 local_bh_enable(); 183 sk->sk_prot = &udp_prot; 184 sk->sk_socket->ops = &inet_dgram_ops; 185 sk->sk_family = PF_INET; 186 } 187 opt = xchg(&np->opt, NULL); 188 if (opt) 189 sock_kfree_s(sk, opt, opt->tot_len); 190 pktopt = xchg(&np->pktoptions, NULL); 191 if (pktopt) 192 kfree_skb(pktopt); 193 194 sk->sk_destruct = inet_sock_destruct; 195 /* 196 * ... and add it to the refcnt debug socks count 197 * in the new family. -acme 198 */ 199 sk_refcnt_debug_inc(sk); 200 module_put(THIS_MODULE); 201 retv = 0; 202 break; 203 } 204 goto e_inval; 205 206 case IPV6_V6ONLY: 207 if (inet_sk(sk)->num) 208 goto e_inval; 209 np->ipv6only = valbool; 210 retv = 0; 211 break; 212 213 case IPV6_RECVPKTINFO: 214 np->rxopt.bits.rxinfo = valbool; 215 retv = 0; 216 break; 217 218 case IPV6_2292PKTINFO: 219 np->rxopt.bits.rxoinfo = valbool; 220 retv = 0; 221 break; 222 223 case IPV6_RECVHOPLIMIT: 224 np->rxopt.bits.rxhlim = valbool; 225 retv = 0; 226 break; 227 228 case IPV6_2292HOPLIMIT: 229 np->rxopt.bits.rxohlim = valbool; 230 retv = 0; 231 break; 232 233 case IPV6_RECVRTHDR: 234 if (val < 0 || val > 2) 235 goto e_inval; 236 np->rxopt.bits.srcrt = val; 237 retv = 0; 238 break; 239 240 case IPV6_2292RTHDR: 241 if (val < 0 || val > 2) 242 goto e_inval; 243 np->rxopt.bits.osrcrt = val; 244 retv = 0; 245 break; 246 247 case IPV6_RECVHOPOPTS: 248 np->rxopt.bits.hopopts = valbool; 249 retv = 0; 250 break; 251 252 case IPV6_2292HOPOPTS: 253 np->rxopt.bits.ohopopts = valbool; 254 retv = 0; 255 break; 256 257 case IPV6_RECVDSTOPTS: 258 np->rxopt.bits.dstopts = valbool; 259 retv = 0; 260 break; 261 262 case IPV6_2292DSTOPTS: 263 np->rxopt.bits.odstopts = valbool; 264 retv = 0; 265 break; 266 267 case IPV6_TCLASS: 268 if (val < 0 || val > 0xff) 269 goto e_inval; 270 np->tclass = val; 271 retv = 0; 272 break; 273 274 case IPV6_RECVTCLASS: 275 np->rxopt.bits.rxtclass = valbool; 276 retv = 0; 277 break; 278 279 case IPV6_FLOWINFO: 280 np->rxopt.bits.rxflow = valbool; 281 retv = 0; 282 break; 283 284 case IPV6_HOPOPTS: 285 case IPV6_RTHDRDSTOPTS: 286 case IPV6_RTHDR: 287 case IPV6_DSTOPTS: 288 { 289 struct ipv6_txoptions *opt; 290 if (optlen == 0) 291 optval = 0; 292 293 /* hop-by-hop / destination options are privileged option */ 294 retv = -EPERM; 295 if (optname != IPV6_RTHDR && !capable(CAP_NET_RAW)) 296 break; 297 298 retv = -EINVAL; 299 if (optlen & 0x7 || optlen > 8 * 255) 300 break; 301 302 opt = ipv6_renew_options(sk, np->opt, optname, 303 (struct ipv6_opt_hdr __user *)optval, 304 optlen); 305 if (IS_ERR(opt)) { 306 retv = PTR_ERR(opt); 307 break; 308 } 309 310 /* routing header option needs extra check */ 311 if (optname == IPV6_RTHDR && opt->srcrt) { 312 struct ipv6_rt_hdr *rthdr = opt->srcrt; 313 if (rthdr->type) 314 goto sticky_done; 315 if ((rthdr->hdrlen & 1) || 316 (rthdr->hdrlen >> 1) != rthdr->segments_left) 317 goto sticky_done; 318 } 319 320 retv = 0; 321 if (sk->sk_type == SOCK_STREAM) { 322 if (opt) { 323 struct tcp_sock *tp = tcp_sk(sk); 324 if (!((1 << sk->sk_state) & 325 (TCPF_LISTEN | TCPF_CLOSE)) 326 && inet_sk(sk)->daddr != LOOPBACK4_IPV6) { 327 tp->ext_header_len = opt->opt_flen + opt->opt_nflen; 328 tcp_sync_mss(sk, tp->pmtu_cookie); 329 } 330 } 331 opt = xchg(&np->opt, opt); 332 sk_dst_reset(sk); 333 } else { 334 write_lock(&sk->sk_dst_lock); 335 opt = xchg(&np->opt, opt); 336 write_unlock(&sk->sk_dst_lock); 337 sk_dst_reset(sk); 338 } 339 sticky_done: 340 if (opt) 341 sock_kfree_s(sk, opt, opt->tot_len); 342 break; 343 } 344 345 case IPV6_2292PKTOPTIONS: 346 { 347 struct ipv6_txoptions *opt = NULL; 348 struct msghdr msg; 349 struct flowi fl; 350 int junk; 351 352 fl.fl6_flowlabel = 0; 353 fl.oif = sk->sk_bound_dev_if; 354 355 if (optlen == 0) 356 goto update; 357 358 /* 1K is probably excessive 359 * 1K is surely not enough, 2K per standard header is 16K. 360 */ 361 retv = -EINVAL; 362 if (optlen > 64*1024) 363 break; 364 365 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL); 366 retv = -ENOBUFS; 367 if (opt == NULL) 368 break; 369 370 memset(opt, 0, sizeof(*opt)); 371 opt->tot_len = sizeof(*opt) + optlen; 372 retv = -EFAULT; 373 if (copy_from_user(opt+1, optval, optlen)) 374 goto done; 375 376 msg.msg_controllen = optlen; 377 msg.msg_control = (void*)(opt+1); 378 379 retv = datagram_send_ctl(&msg, &fl, opt, &junk, &junk); 380 if (retv) 381 goto done; 382 update: 383 retv = 0; 384 if (sk->sk_type == SOCK_STREAM) { 385 if (opt) { 386 struct tcp_sock *tp = tcp_sk(sk); 387 if (!((1 << sk->sk_state) & 388 (TCPF_LISTEN | TCPF_CLOSE)) 389 && inet_sk(sk)->daddr != LOOPBACK4_IPV6) { 390 tp->ext_header_len = opt->opt_flen + opt->opt_nflen; 391 tcp_sync_mss(sk, tp->pmtu_cookie); 392 } 393 } 394 opt = xchg(&np->opt, opt); 395 sk_dst_reset(sk); 396 } else { 397 write_lock(&sk->sk_dst_lock); 398 opt = xchg(&np->opt, opt); 399 write_unlock(&sk->sk_dst_lock); 400 sk_dst_reset(sk); 401 } 402 403 done: 404 if (opt) 405 sock_kfree_s(sk, opt, opt->tot_len); 406 break; 407 } 408 case IPV6_UNICAST_HOPS: 409 if (val > 255 || val < -1) 410 goto e_inval; 411 np->hop_limit = val; 412 retv = 0; 413 break; 414 415 case IPV6_MULTICAST_HOPS: 416 if (sk->sk_type == SOCK_STREAM) 417 goto e_inval; 418 if (val > 255 || val < -1) 419 goto e_inval; 420 np->mcast_hops = val; 421 retv = 0; 422 break; 423 424 case IPV6_MULTICAST_LOOP: 425 np->mc_loop = valbool; 426 retv = 0; 427 break; 428 429 case IPV6_MULTICAST_IF: 430 if (sk->sk_type == SOCK_STREAM) 431 goto e_inval; 432 if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != val) 433 goto e_inval; 434 435 if (__dev_get_by_index(val) == NULL) { 436 retv = -ENODEV; 437 break; 438 } 439 np->mcast_oif = val; 440 retv = 0; 441 break; 442 case IPV6_ADD_MEMBERSHIP: 443 case IPV6_DROP_MEMBERSHIP: 444 { 445 struct ipv6_mreq mreq; 446 447 retv = -EFAULT; 448 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq))) 449 break; 450 451 if (optname == IPV6_ADD_MEMBERSHIP) 452 retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr); 453 else 454 retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr); 455 break; 456 } 457 case IPV6_JOIN_ANYCAST: 458 case IPV6_LEAVE_ANYCAST: 459 { 460 struct ipv6_mreq mreq; 461 462 if (optlen != sizeof(struct ipv6_mreq)) 463 goto e_inval; 464 465 retv = -EFAULT; 466 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq))) 467 break; 468 469 if (optname == IPV6_JOIN_ANYCAST) 470 retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr); 471 else 472 retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr); 473 break; 474 } 475 case MCAST_JOIN_GROUP: 476 case MCAST_LEAVE_GROUP: 477 { 478 struct group_req greq; 479 struct sockaddr_in6 *psin6; 480 481 retv = -EFAULT; 482 if (copy_from_user(&greq, optval, sizeof(struct group_req))) 483 break; 484 if (greq.gr_group.ss_family != AF_INET6) { 485 retv = -EADDRNOTAVAIL; 486 break; 487 } 488 psin6 = (struct sockaddr_in6 *)&greq.gr_group; 489 if (optname == MCAST_JOIN_GROUP) 490 retv = ipv6_sock_mc_join(sk, greq.gr_interface, 491 &psin6->sin6_addr); 492 else 493 retv = ipv6_sock_mc_drop(sk, greq.gr_interface, 494 &psin6->sin6_addr); 495 break; 496 } 497 case MCAST_JOIN_SOURCE_GROUP: 498 case MCAST_LEAVE_SOURCE_GROUP: 499 case MCAST_BLOCK_SOURCE: 500 case MCAST_UNBLOCK_SOURCE: 501 { 502 struct group_source_req greqs; 503 int omode, add; 504 505 if (optlen != sizeof(struct group_source_req)) 506 goto e_inval; 507 if (copy_from_user(&greqs, optval, sizeof(greqs))) { 508 retv = -EFAULT; 509 break; 510 } 511 if (greqs.gsr_group.ss_family != AF_INET6 || 512 greqs.gsr_source.ss_family != AF_INET6) { 513 retv = -EADDRNOTAVAIL; 514 break; 515 } 516 if (optname == MCAST_BLOCK_SOURCE) { 517 omode = MCAST_EXCLUDE; 518 add = 1; 519 } else if (optname == MCAST_UNBLOCK_SOURCE) { 520 omode = MCAST_EXCLUDE; 521 add = 0; 522 } else if (optname == MCAST_JOIN_SOURCE_GROUP) { 523 struct sockaddr_in6 *psin6; 524 525 psin6 = (struct sockaddr_in6 *)&greqs.gsr_group; 526 retv = ipv6_sock_mc_join(sk, greqs.gsr_interface, 527 &psin6->sin6_addr); 528 /* prior join w/ different source is ok */ 529 if (retv && retv != -EADDRINUSE) 530 break; 531 omode = MCAST_INCLUDE; 532 add = 1; 533 } else /* MCAST_LEAVE_SOURCE_GROUP */ { 534 omode = MCAST_INCLUDE; 535 add = 0; 536 } 537 retv = ip6_mc_source(add, omode, sk, &greqs); 538 break; 539 } 540 case MCAST_MSFILTER: 541 { 542 extern int sysctl_mld_max_msf; 543 struct group_filter *gsf; 544 545 if (optlen < GROUP_FILTER_SIZE(0)) 546 goto e_inval; 547 if (optlen > sysctl_optmem_max) { 548 retv = -ENOBUFS; 549 break; 550 } 551 gsf = (struct group_filter *)kmalloc(optlen,GFP_KERNEL); 552 if (gsf == 0) { 553 retv = -ENOBUFS; 554 break; 555 } 556 retv = -EFAULT; 557 if (copy_from_user(gsf, optval, optlen)) { 558 kfree(gsf); 559 break; 560 } 561 /* numsrc >= (4G-140)/128 overflow in 32 bits */ 562 if (gsf->gf_numsrc >= 0x1ffffffU || 563 gsf->gf_numsrc > sysctl_mld_max_msf) { 564 kfree(gsf); 565 retv = -ENOBUFS; 566 break; 567 } 568 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) { 569 kfree(gsf); 570 retv = -EINVAL; 571 break; 572 } 573 retv = ip6_mc_msfilter(sk, gsf); 574 kfree(gsf); 575 576 break; 577 } 578 case IPV6_ROUTER_ALERT: 579 retv = ip6_ra_control(sk, val, NULL); 580 break; 581 case IPV6_MTU_DISCOVER: 582 if (val<0 || val>2) 583 goto e_inval; 584 np->pmtudisc = val; 585 retv = 0; 586 break; 587 case IPV6_MTU: 588 if (val && val < IPV6_MIN_MTU) 589 goto e_inval; 590 np->frag_size = val; 591 retv = 0; 592 break; 593 case IPV6_RECVERR: 594 np->recverr = valbool; 595 if (!val) 596 skb_queue_purge(&sk->sk_error_queue); 597 retv = 0; 598 break; 599 case IPV6_FLOWINFO_SEND: 600 np->sndflow = valbool; 601 retv = 0; 602 break; 603 case IPV6_FLOWLABEL_MGR: 604 retv = ipv6_flowlabel_opt(sk, optval, optlen); 605 break; 606 case IPV6_IPSEC_POLICY: 607 case IPV6_XFRM_POLICY: 608 retv = -EPERM; 609 if (!capable(CAP_NET_ADMIN)) 610 break; 611 retv = xfrm_user_policy(sk, optname, optval, optlen); 612 break; 613 614 #ifdef CONFIG_NETFILTER 615 default: 616 retv = nf_setsockopt(sk, PF_INET6, optname, optval, 617 optlen); 618 break; 619 #endif 620 621 } 622 release_sock(sk); 623 624 out: 625 return retv; 626 627 e_inval: 628 release_sock(sk); 629 return -EINVAL; 630 } 631 632 int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_opt_hdr *hdr, 633 char __user *optval, int len) 634 { 635 if (!hdr) 636 return 0; 637 len = min_t(int, len, ipv6_optlen(hdr)); 638 if (copy_to_user(optval, hdr, ipv6_optlen(hdr))) 639 return -EFAULT; 640 return len; 641 } 642 643 int ipv6_getsockopt(struct sock *sk, int level, int optname, 644 char __user *optval, int __user *optlen) 645 { 646 struct ipv6_pinfo *np = inet6_sk(sk); 647 int len; 648 int val; 649 650 if (level == SOL_IP && sk->sk_type != SOCK_RAW) 651 return udp_prot.getsockopt(sk, level, optname, optval, optlen); 652 if(level!=SOL_IPV6) 653 return -ENOPROTOOPT; 654 if (get_user(len, optlen)) 655 return -EFAULT; 656 switch (optname) { 657 case IPV6_ADDRFORM: 658 if (sk->sk_protocol != IPPROTO_UDP && 659 sk->sk_protocol != IPPROTO_TCP) 660 return -EINVAL; 661 if (sk->sk_state != TCP_ESTABLISHED) 662 return -ENOTCONN; 663 val = sk->sk_family; 664 break; 665 case MCAST_MSFILTER: 666 { 667 struct group_filter gsf; 668 int err; 669 670 if (len < GROUP_FILTER_SIZE(0)) 671 return -EINVAL; 672 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) 673 return -EFAULT; 674 lock_sock(sk); 675 err = ip6_mc_msfget(sk, &gsf, 676 (struct group_filter __user *)optval, optlen); 677 release_sock(sk); 678 return err; 679 } 680 681 case IPV6_2292PKTOPTIONS: 682 { 683 struct msghdr msg; 684 struct sk_buff *skb; 685 686 if (sk->sk_type != SOCK_STREAM) 687 return -ENOPROTOOPT; 688 689 msg.msg_control = optval; 690 msg.msg_controllen = len; 691 msg.msg_flags = 0; 692 693 lock_sock(sk); 694 skb = np->pktoptions; 695 if (skb) 696 atomic_inc(&skb->users); 697 release_sock(sk); 698 699 if (skb) { 700 int err = datagram_recv_ctl(sk, &msg, skb); 701 kfree_skb(skb); 702 if (err) 703 return err; 704 } else { 705 if (np->rxopt.bits.rxinfo) { 706 struct in6_pktinfo src_info; 707 src_info.ipi6_ifindex = np->mcast_oif; 708 ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr); 709 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info); 710 } 711 if (np->rxopt.bits.rxhlim) { 712 int hlim = np->mcast_hops; 713 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim); 714 } 715 if (np->rxopt.bits.rxoinfo) { 716 struct in6_pktinfo src_info; 717 src_info.ipi6_ifindex = np->mcast_oif; 718 ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr); 719 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info); 720 } 721 if (np->rxopt.bits.rxohlim) { 722 int hlim = np->mcast_hops; 723 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim); 724 } 725 } 726 len -= msg.msg_controllen; 727 return put_user(len, optlen); 728 } 729 case IPV6_MTU: 730 { 731 struct dst_entry *dst; 732 val = 0; 733 lock_sock(sk); 734 dst = sk_dst_get(sk); 735 if (dst) { 736 val = dst_mtu(dst); 737 dst_release(dst); 738 } 739 release_sock(sk); 740 if (!val) 741 return -ENOTCONN; 742 break; 743 } 744 745 case IPV6_V6ONLY: 746 val = np->ipv6only; 747 break; 748 749 case IPV6_RECVPKTINFO: 750 val = np->rxopt.bits.rxinfo; 751 break; 752 753 case IPV6_2292PKTINFO: 754 val = np->rxopt.bits.rxoinfo; 755 break; 756 757 case IPV6_RECVHOPLIMIT: 758 val = np->rxopt.bits.rxhlim; 759 break; 760 761 case IPV6_2292HOPLIMIT: 762 val = np->rxopt.bits.rxohlim; 763 break; 764 765 case IPV6_RECVRTHDR: 766 val = np->rxopt.bits.srcrt; 767 break; 768 769 case IPV6_2292RTHDR: 770 val = np->rxopt.bits.osrcrt; 771 break; 772 773 case IPV6_HOPOPTS: 774 case IPV6_RTHDRDSTOPTS: 775 case IPV6_RTHDR: 776 case IPV6_DSTOPTS: 777 { 778 779 lock_sock(sk); 780 len = ipv6_getsockopt_sticky(sk, np->opt->hopopt, 781 optval, len); 782 release_sock(sk); 783 return put_user(len, optlen); 784 } 785 786 case IPV6_RECVHOPOPTS: 787 val = np->rxopt.bits.hopopts; 788 break; 789 790 case IPV6_2292HOPOPTS: 791 val = np->rxopt.bits.ohopopts; 792 break; 793 794 case IPV6_RECVDSTOPTS: 795 val = np->rxopt.bits.dstopts; 796 break; 797 798 case IPV6_2292DSTOPTS: 799 val = np->rxopt.bits.odstopts; 800 break; 801 802 case IPV6_TCLASS: 803 val = np->tclass; 804 break; 805 806 case IPV6_RECVTCLASS: 807 val = np->rxopt.bits.rxtclass; 808 break; 809 810 case IPV6_FLOWINFO: 811 val = np->rxopt.bits.rxflow; 812 break; 813 814 case IPV6_UNICAST_HOPS: 815 val = np->hop_limit; 816 break; 817 818 case IPV6_MULTICAST_HOPS: 819 val = np->mcast_hops; 820 break; 821 822 case IPV6_MULTICAST_LOOP: 823 val = np->mc_loop; 824 break; 825 826 case IPV6_MULTICAST_IF: 827 val = np->mcast_oif; 828 break; 829 830 case IPV6_MTU_DISCOVER: 831 val = np->pmtudisc; 832 break; 833 834 case IPV6_RECVERR: 835 val = np->recverr; 836 break; 837 838 case IPV6_FLOWINFO_SEND: 839 val = np->sndflow; 840 break; 841 842 default: 843 #ifdef CONFIG_NETFILTER 844 lock_sock(sk); 845 val = nf_getsockopt(sk, PF_INET6, optname, optval, 846 &len); 847 release_sock(sk); 848 if (val >= 0) 849 val = put_user(len, optlen); 850 return val; 851 #else 852 return -EINVAL; 853 #endif 854 } 855 len = min_t(unsigned int, sizeof(int), len); 856 if(put_user(len, optlen)) 857 return -EFAULT; 858 if(copy_to_user(optval,&val,len)) 859 return -EFAULT; 860 return 0; 861 } 862 863 void __init ipv6_packet_init(void) 864 { 865 dev_add_pack(&ipv6_packet_type); 866 } 867 868 void ipv6_packet_cleanup(void) 869 { 870 dev_remove_pack(&ipv6_packet_type); 871 } 872