net/ipv6/ipv6_sockglue.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *      IPv6 BSD socket options interface
   4  *      Linux INET6 implementation
   5  *
   6  *      Authors:
   7  *      Pedro Roque             <roque@di.fc.ul.pt>
   8  *
   9  *      Based on linux/net/ipv4/ip_sockglue.c
  10  *
  11  *      FIXME: Make the setsockopt code POSIX compliant: That is
  12  *
  13  *      o       Truncate getsockopt returns
  14  *      o       Return an optlen of the truncated length if need be
  15  *
  16  *      Changes:
  17  *      David L Stevens <dlstevens@us.ibm.com>:
  18  *              - added multicast source filtering API for MLDv2
  19  */
  20
  21 #include <linux/module.h>
  22 #include <linux/capability.h>
  23 #include <linux/errno.h>
  24 #include <linux/types.h>
  25 #include <linux/socket.h>
  26 #include <linux/sockios.h>
  27 #include <linux/net.h>
  28 #include <linux/in6.h>
  29 #include <linux/mroute6.h>
  30 #include <linux/netdevice.h>
  31 #include <linux/if_arp.h>
  32 #include <linux/init.h>
  33 #include <linux/sysctl.h>
  34 #include <linux/netfilter.h>
  35 #include <linux/slab.h>
  36
  37 #include <net/sock.h>
  38 #include <net/snmp.h>
  39 #include <net/ipv6.h>
  40 #include <net/ndisc.h>
  41 #include <net/protocol.h>
  42 #include <net/transp_v6.h>
  43 #include <net/ip6_route.h>
  44 #include <net/addrconf.h>
  45 #include <net/inet_common.h>
  46 #include <net/tcp.h>
  47 #include <net/udp.h>
  48 #include <net/udplite.h>
  49 #include <net/xfrm.h>
  50 #include <net/compat.h>
  51 #include <net/seg6.h>
  52
  53 #include <linux/uaccess.h>
  54
  55 struct ip6_ra_chain *ip6_ra_chain;
  56 DEFINE_RWLOCK(ip6_ra_lock);
  57
  58 int ip6_ra_control(struct sock *sk, int sel)
  59 {
  60         struct ip6_ra_chain *ra, *new_ra, **rap;
  61
  62         /* RA packet may be delivered ONLY to IPPROTO_RAW socket */
  63         if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num != IPPROTO_RAW)
  64                 return -ENOPROTOOPT;
  65
  66         new_ra = (sel >= 0) ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
  67         if (sel >= 0 && !new_ra)
  68                 return -ENOMEM;
  69
  70         write_lock_bh(&ip6_ra_lock);
  71         for (rap = &ip6_ra_chain; (ra = *rap) != NULL; rap = &ra->next) {
  72                 if (ra->sk == sk) {
  73                         if (sel >= 0) {
  74                                 write_unlock_bh(&ip6_ra_lock);
  75                                 kfree(new_ra);
  76                                 return -EADDRINUSE;
  77                         }
  78
  79                         *rap = ra->next;
  80                         write_unlock_bh(&ip6_ra_lock);
  81
  82                         sock_put(sk);
  83                         kfree(ra);
  84                         return 0;
  85                 }
  86         }
  87         if (!new_ra) {
  88                 write_unlock_bh(&ip6_ra_lock);
  89                 return -ENOBUFS;
  90         }
  91         new_ra->sk = sk;
  92         new_ra->sel = sel;
  93         new_ra->next = ra;
  94         *rap = new_ra;
  95         sock_hold(sk);
  96         write_unlock_bh(&ip6_ra_lock);
  97         return 0;
  98 }
  99
 100 struct ipv6_txoptions *ipv6_update_options(struct sock *sk,
 101                                            struct ipv6_txoptions *opt)
 102 {
 103         if (inet_sk(sk)->is_icsk) {
 104                 if (opt &&
 105                     !((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) &&
 106                     inet_sk(sk)->inet_daddr != LOOPBACK4_IPV6) {
 107                         struct inet_connection_sock *icsk = inet_csk(sk);
 108                         icsk->icsk_ext_hdr_len = opt->opt_flen + opt->opt_nflen;
 109                         icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
 110                 }
 111         }
 112         opt = xchg((__force struct ipv6_txoptions **)&inet6_sk(sk)->opt,
 113                    opt);
 114         sk_dst_reset(sk);
 115
 116         return opt;
 117 }
 118
 119 static bool setsockopt_needs_rtnl(int optname)
 120 {
 121         switch (optname) {
 122         case IPV6_ADDRFORM:
 123         case IPV6_ADD_MEMBERSHIP:
 124         case IPV6_DROP_MEMBERSHIP:
 125         case IPV6_JOIN_ANYCAST:
 126         case IPV6_LEAVE_ANYCAST:
 127         case MCAST_JOIN_GROUP:
 128         case MCAST_LEAVE_GROUP:
 129         case MCAST_JOIN_SOURCE_GROUP:
 130         case MCAST_LEAVE_SOURCE_GROUP:
 131         case MCAST_BLOCK_SOURCE:
 132         case MCAST_UNBLOCK_SOURCE:
 133         case MCAST_MSFILTER:
 134                 return true;
 135         }
 136         return false;
 137 }
 138
 139 static int do_ipv6_mcast_group_source(struct sock *sk, int optname,
 140                                       struct group_source_req *greqs)
 141 {
 142         int omode, add;
 143
 144         if (greqs->gsr_group.ss_family != AF_INET6 ||
 145             greqs->gsr_source.ss_family != AF_INET6)
 146                 return -EADDRNOTAVAIL;
 147
 148         if (optname == MCAST_BLOCK_SOURCE) {
 149                 omode = MCAST_EXCLUDE;
 150                 add = 1;
 151         } else if (optname == MCAST_UNBLOCK_SOURCE) {
 152                 omode = MCAST_EXCLUDE;
 153                 add = 0;
 154         } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
 155                 struct sockaddr_in6 *psin6;
 156                 int retv;
 157
 158                 psin6 = (struct sockaddr_in6 *)&greqs->gsr_group;
 159                 retv = ipv6_sock_mc_join_ssm(sk, greqs->gsr_interface,
 160                                              &psin6->sin6_addr,
 161                                              MCAST_INCLUDE);
 162                 /* prior join w/ different source is ok */
 163                 if (retv && retv != -EADDRINUSE)
 164                         return retv;
 165                 omode = MCAST_INCLUDE;
 166                 add = 1;
 167         } else /* MCAST_LEAVE_SOURCE_GROUP */ {
 168                 omode = MCAST_INCLUDE;
 169                 add = 0;
 170         }
 171         return ip6_mc_source(add, omode, sk, greqs);
 172 }
 173
 174 static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
 175                     char __user *optval, unsigned int optlen)
 176 {
 177         struct ipv6_pinfo *np = inet6_sk(sk);
 178         struct net *net = sock_net(sk);
 179         int val, valbool;
 180         int retv = -ENOPROTOOPT;
 181         bool needs_rtnl = setsockopt_needs_rtnl(optname);
 182
 183         if (!optval)
 184                 val = 0;
 185         else {
 186                 if (optlen >= sizeof(int)) {
 187                         if (get_user(val, (int __user *) optval))
 188                                 return -EFAULT;
 189                 } else
 190                         val = 0;
 191         }
 192
 193         valbool = (val != 0);
 194
 195         if (ip6_mroute_opt(optname))
 196                 return ip6_mroute_setsockopt(sk, optname, optval, optlen);
 197
 198         if (needs_rtnl)
 199                 rtnl_lock();
 200         lock_sock(sk);
 201
 202         switch (optname) {
 203
 204         case IPV6_ADDRFORM:
 205                 if (optlen < sizeof(int))
 206                         goto e_inval;
 207                 if (val == PF_INET) {
 208                         struct ipv6_txoptions *opt;
 209                         struct sk_buff *pktopt;
 210
 211                         if (sk->sk_type == SOCK_RAW)
 212                                 break;
 213
 214                         if (sk->sk_protocol == IPPROTO_UDP ||
 215                             sk->sk_protocol == IPPROTO_UDPLITE) {
 216                                 struct udp_sock *up = udp_sk(sk);
 217                                 if (up->pending == AF_INET6) {
 218                                         retv = -EBUSY;
 219                                         break;
 220                                 }
 221                         } else if (sk->sk_protocol == IPPROTO_TCP) {
 222                                 if (sk->sk_prot != &tcpv6_prot) {
 223                                         retv = -EBUSY;
 224                                         break;
 225                                 }
 226                         } else {
 227                                 break;
 228                         }
 229
 230                         if (sk->sk_state != TCP_ESTABLISHED) {
 231                                 retv = -ENOTCONN;
 232                                 break;
 233                         }
 234
 235                         if (ipv6_only_sock(sk) ||
 236                             !ipv6_addr_v4mapped(&sk->sk_v6_daddr)) {
 237                                 retv = -EADDRNOTAVAIL;
 238                                 break;
 239                         }
 240
 241                         fl6_free_socklist(sk);
 242                         __ipv6_sock_mc_close(sk);
 243
 244                         /*
 245                          * Sock is moving from IPv6 to IPv4 (sk_prot), so
 246                          * remove it from the refcnt debug socks count in the
 247                          * original family...
 248                          */
 249                         sk_refcnt_debug_dec(sk);
 250
 251                         if (sk->sk_protocol == IPPROTO_TCP) {
 252                                 struct inet_connection_sock *icsk = inet_csk(sk);
 253                                 local_bh_disable();
 254                                 sock_prot_inuse_add(net, sk->sk_prot, -1);
 255                                 sock_prot_inuse_add(net, &tcp_prot, 1);
 256                                 local_bh_enable();
 257                                 sk->sk_prot = &tcp_prot;
 258                                 icsk->icsk_af_ops = &ipv4_specific;
 259                                 sk->sk_socket->ops = &inet_stream_ops;
 260                                 sk->sk_family = PF_INET;
 261                                 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
 262                         } else {
 263                                 struct proto *prot = &udp_prot;
 264
 265                                 if (sk->sk_protocol == IPPROTO_UDPLITE)
 266                                         prot = &udplite_prot;
 267                                 local_bh_disable();
 268                                 sock_prot_inuse_add(net, sk->sk_prot, -1);
 269                                 sock_prot_inuse_add(net, prot, 1);
 270                                 local_bh_enable();
 271                                 sk->sk_prot = prot;
 272                                 sk->sk_socket->ops = &inet_dgram_ops;
 273                                 sk->sk_family = PF_INET;
 274                         }
 275                         opt = xchg((__force struct ipv6_txoptions **)&np->opt,
 276                                    NULL);
 277                         if (opt) {
 278                                 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
 279                                 txopt_put(opt);
 280                         }
 281                         pktopt = xchg(&np->pktoptions, NULL);
 282                         kfree_skb(pktopt);
 283
 284                         /*
 285                          * ... and add it to the refcnt debug socks count
 286                          * in the new family. -acme
 287                          */
 288                         sk_refcnt_debug_inc(sk);
 289                         module_put(THIS_MODULE);
 290                         retv = 0;
 291                         break;
 292                 }
 293                 goto e_inval;
 294
 295         case IPV6_V6ONLY:
 296                 if (optlen < sizeof(int) ||
 297                     inet_sk(sk)->inet_num)
 298                         goto e_inval;
 299                 sk->sk_ipv6only = valbool;
 300                 retv = 0;
 301                 break;
 302
 303         case IPV6_RECVPKTINFO:
 304                 if (optlen < sizeof(int))
 305                         goto e_inval;
 306                 np->rxopt.bits.rxinfo = valbool;
 307                 retv = 0;
 308                 break;
 309
 310         case IPV6_2292PKTINFO:
 311                 if (optlen < sizeof(int))
 312                         goto e_inval;
 313                 np->rxopt.bits.rxoinfo = valbool;
 314                 retv = 0;
 315                 break;
 316
 317         case IPV6_RECVHOPLIMIT:
 318                 if (optlen < sizeof(int))
 319                         goto e_inval;
 320                 np->rxopt.bits.rxhlim = valbool;
 321                 retv = 0;
 322                 break;
 323
 324         case IPV6_2292HOPLIMIT:
 325                 if (optlen < sizeof(int))
 326                         goto e_inval;
 327                 np->rxopt.bits.rxohlim = valbool;
 328                 retv = 0;
 329                 break;
 330
 331         case IPV6_RECVRTHDR:
 332                 if (optlen < sizeof(int))
 333                         goto e_inval;
 334                 np->rxopt.bits.srcrt = valbool;
 335                 retv = 0;
 336                 break;
 337
 338         case IPV6_2292RTHDR:
 339                 if (optlen < sizeof(int))
 340                         goto e_inval;
 341                 np->rxopt.bits.osrcrt = valbool;
 342                 retv = 0;
 343                 break;
 344
 345         case IPV6_RECVHOPOPTS:
 346                 if (optlen < sizeof(int))
 347                         goto e_inval;
 348                 np->rxopt.bits.hopopts = valbool;
 349                 retv = 0;
 350                 break;
 351
 352         case IPV6_2292HOPOPTS:
 353                 if (optlen < sizeof(int))
 354                         goto e_inval;
 355                 np->rxopt.bits.ohopopts = valbool;
 356                 retv = 0;
 357                 break;
 358
 359         case IPV6_RECVDSTOPTS:
 360                 if (optlen < sizeof(int))
 361                         goto e_inval;
 362                 np->rxopt.bits.dstopts = valbool;
 363                 retv = 0;
 364                 break;
 365
 366         case IPV6_2292DSTOPTS:
 367                 if (optlen < sizeof(int))
 368                         goto e_inval;
 369                 np->rxopt.bits.odstopts = valbool;
 370                 retv = 0;
 371                 break;
 372
 373         case IPV6_TCLASS:
 374                 if (optlen < sizeof(int))
 375                         goto e_inval;
 376                 if (val < -1 || val > 0xff)
 377                         goto e_inval;
 378                 /* RFC 3542, 6.5: default traffic class of 0x0 */
 379                 if (val == -1)
 380                         val = 0;
 381                 np->tclass = val;
 382                 retv = 0;
 383                 break;
 384
 385         case IPV6_RECVTCLASS:
 386                 if (optlen < sizeof(int))
 387                         goto e_inval;
 388                 np->rxopt.bits.rxtclass = valbool;
 389                 retv = 0;
 390                 break;
 391
 392         case IPV6_FLOWINFO:
 393                 if (optlen < sizeof(int))
 394                         goto e_inval;
 395                 np->rxopt.bits.rxflow = valbool;
 396                 retv = 0;
 397                 break;
 398
 399         case IPV6_RECVPATHMTU:
 400                 if (optlen < sizeof(int))
 401                         goto e_inval;
 402                 np->rxopt.bits.rxpmtu = valbool;
 403                 retv = 0;
 404                 break;
 405
 406         case IPV6_TRANSPARENT:
 407                 if (valbool && !ns_capable(net->user_ns, CAP_NET_RAW) &&
 408                     !ns_capable(net->user_ns, CAP_NET_ADMIN)) {
 409                         retv = -EPERM;
 410                         break;
 411                 }
 412                 if (optlen < sizeof(int))
 413                         goto e_inval;
 414                 /* we don't have a separate transparent bit for IPV6 we use the one in the IPv4 socket */
 415                 inet_sk(sk)->transparent = valbool;
 416                 retv = 0;
 417                 break;
 418
 419         case IPV6_FREEBIND:
 420                 if (optlen < sizeof(int))
 421                         goto e_inval;
 422                 /* we also don't have a separate freebind bit for IPV6 */
 423                 inet_sk(sk)->freebind = valbool;
 424                 retv = 0;
 425                 break;
 426
 427         case IPV6_RECVORIGDSTADDR:
 428                 if (optlen < sizeof(int))
 429                         goto e_inval;
 430                 np->rxopt.bits.rxorigdstaddr = valbool;
 431                 retv = 0;
 432                 break;
 433
 434         case IPV6_HOPOPTS:
 435         case IPV6_RTHDRDSTOPTS:
 436         case IPV6_RTHDR:
 437         case IPV6_DSTOPTS:
 438         {
 439                 struct ipv6_txoptions *opt;
 440                 struct ipv6_opt_hdr *new = NULL;
 441
 442                 /* hop-by-hop / destination options are privileged option */
 443                 retv = -EPERM;
 444                 if (optname != IPV6_RTHDR && !ns_capable(net->user_ns, CAP_NET_RAW))
 445                         break;
 446
 447                 /* remove any sticky options header with a zero option
 448                  * length, per RFC3542.
 449                  */
 450                 if (optlen == 0)
 451                         optval = NULL;
 452                 else if (!optval)
 453                         goto e_inval;
 454                 else if (optlen < sizeof(struct ipv6_opt_hdr) ||
 455                          optlen & 0x7 || optlen > 8 * 255)
 456                         goto e_inval;
 457                 else {
 458                         new = memdup_user(optval, optlen);
 459                         if (IS_ERR(new)) {
 460                                 retv = PTR_ERR(new);
 461                                 break;
 462                         }
 463                         if (unlikely(ipv6_optlen(new) > optlen)) {
 464                                 kfree(new);
 465                                 goto e_inval;
 466                         }
 467                 }
 468
 469                 opt = rcu_dereference_protected(np->opt,
 470                                                 lockdep_sock_is_held(sk));
 471                 opt = ipv6_renew_options(sk, opt, optname, new);
 472                 kfree(new);
 473                 if (IS_ERR(opt)) {
 474                         retv = PTR_ERR(opt);
 475                         break;
 476                 }
 477
 478                 /* routing header option needs extra check */
 479                 retv = -EINVAL;
 480                 if (optname == IPV6_RTHDR && opt && opt->srcrt) {
 481                         struct ipv6_rt_hdr *rthdr = opt->srcrt;
 482                         switch (rthdr->type) {
 483 #if IS_ENABLED(CONFIG_IPV6_MIP6)
 484                         case IPV6_SRCRT_TYPE_2:
 485                                 if (rthdr->hdrlen != 2 ||
 486                                     rthdr->segments_left != 1)
 487                                         goto sticky_done;
 488
 489                                 break;
 490 #endif
 491                         case IPV6_SRCRT_TYPE_4:
 492                         {
 493                                 struct ipv6_sr_hdr *srh = (struct ipv6_sr_hdr *)
 494                                                           opt->srcrt;
 495
 496                                 if (!seg6_validate_srh(srh, optlen))
 497                                         goto sticky_done;
 498                                 break;
 499                         }
 500                         default:
 501                                 goto sticky_done;
 502                         }
 503                 }
 504
 505                 retv = 0;
 506                 opt = ipv6_update_options(sk, opt);
 507 sticky_done:
 508                 if (opt) {
 509                         atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
 510                         txopt_put(opt);
 511                 }
 512                 break;
 513         }
 514
 515         case IPV6_PKTINFO:
 516         {
 517                 struct in6_pktinfo pkt;
 518
 519                 if (optlen == 0)
 520                         goto e_inval;
 521                 else if (optlen < sizeof(struct in6_pktinfo) || !optval)
 522                         goto e_inval;
 523
 524                 if (copy_from_user(&pkt, optval, sizeof(struct in6_pktinfo))) {
 525                                 retv = -EFAULT;
 526                                 break;
 527                 }
 528                 if (!sk_dev_equal_l3scope(sk, pkt.ipi6_ifindex))
 529                         goto e_inval;
 530
 531                 np->sticky_pktinfo.ipi6_ifindex = pkt.ipi6_ifindex;
 532                 np->sticky_pktinfo.ipi6_addr = pkt.ipi6_addr;
 533                 retv = 0;
 534                 break;
 535         }
 536
 537         case IPV6_2292PKTOPTIONS:
 538         {
 539                 struct ipv6_txoptions *opt = NULL;
 540                 struct msghdr msg;
 541                 struct flowi6 fl6;
 542                 struct ipcm6_cookie ipc6;
 543
 544                 memset(&fl6, 0, sizeof(fl6));
 545                 fl6.flowi6_oif = sk->sk_bound_dev_if;
 546                 fl6.flowi6_mark = sk->sk_mark;
 547
 548                 if (optlen == 0)
 549                         goto update;
 550
 551                 /* 1K is probably excessive
 552                  * 1K is surely not enough, 2K per standard header is 16K.
 553                  */
 554                 retv = -EINVAL;
 555                 if (optlen > 64*1024)
 556                         break;
 557
 558                 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
 559                 retv = -ENOBUFS;
 560                 if (!opt)
 561                         break;
 562
 563                 memset(opt, 0, sizeof(*opt));
 564                 refcount_set(&opt->refcnt, 1);
 565                 opt->tot_len = sizeof(*opt) + optlen;
 566                 retv = -EFAULT;
 567                 if (copy_from_user(opt+1, optval, optlen))
 568                         goto done;
 569
 570                 msg.msg_controllen = optlen;
 571                 msg.msg_control = (void *)(opt+1);
 572                 ipc6.opt = opt;
 573
 574                 retv = ip6_datagram_send_ctl(net, sk, &msg, &fl6, &ipc6);
 575                 if (retv)
 576                         goto done;
 577 update:
 578                 retv = 0;
 579                 opt = ipv6_update_options(sk, opt);
 580 done:
 581                 if (opt) {
 582                         atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
 583                         txopt_put(opt);
 584                 }
 585                 break;
 586         }
 587         case IPV6_UNICAST_HOPS:
 588                 if (optlen < sizeof(int))
 589                         goto e_inval;
 590                 if (val > 255 || val < -1)
 591                         goto e_inval;
 592                 np->hop_limit = val;
 593                 retv = 0;
 594                 break;
 595
 596         case IPV6_MULTICAST_HOPS:
 597                 if (sk->sk_type == SOCK_STREAM)
 598                         break;
 599                 if (optlen < sizeof(int))
 600                         goto e_inval;
 601                 if (val > 255 || val < -1)
 602                         goto e_inval;
 603                 np->mcast_hops = (val == -1 ? IPV6_DEFAULT_MCASTHOPS : val);
 604                 retv = 0;
 605                 break;
 606
 607         case IPV6_MULTICAST_LOOP:
 608                 if (optlen < sizeof(int))
 609                         goto e_inval;
 610                 if (val != valbool)
 611                         goto e_inval;
 612                 np->mc_loop = valbool;
 613                 retv = 0;
 614                 break;
 615
 616         case IPV6_UNICAST_IF:
 617         {
 618                 struct net_device *dev = NULL;
 619                 int ifindex;
 620
 621                 if (optlen != sizeof(int))
 622                         goto e_inval;
 623
 624                 ifindex = (__force int)ntohl((__force __be32)val);
 625                 if (ifindex == 0) {
 626                         np->ucast_oif = 0;
 627                         retv = 0;
 628                         break;
 629                 }
 630
 631                 dev = dev_get_by_index(net, ifindex);
 632                 retv = -EADDRNOTAVAIL;
 633                 if (!dev)
 634                         break;
 635                 dev_put(dev);
 636
 637                 retv = -EINVAL;
 638                 if (sk->sk_bound_dev_if)
 639                         break;
 640
 641                 np->ucast_oif = ifindex;
 642                 retv = 0;
 643                 break;
 644         }
 645
 646         case IPV6_MULTICAST_IF:
 647                 if (sk->sk_type == SOCK_STREAM)
 648                         break;
 649                 if (optlen < sizeof(int))
 650                         goto e_inval;
 651
 652                 if (val) {
 653                         struct net_device *dev;
 654                         int midx;
 655
 656                         rcu_read_lock();
 657
 658                         dev = dev_get_by_index_rcu(net, val);
 659                         if (!dev) {
 660                                 rcu_read_unlock();
 661                                 retv = -ENODEV;
 662                                 break;
 663                         }
 664                         midx = l3mdev_master_ifindex_rcu(dev);
 665
 666                         rcu_read_unlock();
 667
 668                         if (sk->sk_bound_dev_if &&
 669                             sk->sk_bound_dev_if != val &&
 670                             (!midx || midx != sk->sk_bound_dev_if))
 671                                 goto e_inval;
 672                 }
 673                 np->mcast_oif = val;
 674                 retv = 0;
 675                 break;
 676         case IPV6_ADD_MEMBERSHIP:
 677         case IPV6_DROP_MEMBERSHIP:
 678         {
 679                 struct ipv6_mreq mreq;
 680
 681                 if (optlen < sizeof(struct ipv6_mreq))
 682                         goto e_inval;
 683
 684                 retv = -EPROTO;
 685                 if (inet_sk(sk)->is_icsk)
 686                         break;
 687
 688                 retv = -EFAULT;
 689                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
 690                         break;
 691
 692                 if (optname == IPV6_ADD_MEMBERSHIP)
 693                         retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 694                 else
 695                         retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 696                 break;
 697         }
 698         case IPV6_JOIN_ANYCAST:
 699         case IPV6_LEAVE_ANYCAST:
 700         {
 701                 struct ipv6_mreq mreq;
 702
 703                 if (optlen < sizeof(struct ipv6_mreq))
 704                         goto e_inval;
 705
 706                 retv = -EFAULT;
 707                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
 708                         break;
 709
 710                 if (optname == IPV6_JOIN_ANYCAST)
 711                         retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
 712                 else
 713                         retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
 714                 break;
 715         }
 716         case IPV6_MULTICAST_ALL:
 717                 if (optlen < sizeof(int))
 718                         goto e_inval;
 719                 np->mc_all = valbool;
 720                 retv = 0;
 721                 break;
 722
 723         case MCAST_JOIN_GROUP:
 724         case MCAST_LEAVE_GROUP:
 725         {
 726                 struct group_req greq;
 727                 struct sockaddr_in6 *psin6;
 728
 729                 if (optlen < sizeof(struct group_req))
 730                         goto e_inval;
 731
 732                 retv = -EFAULT;
 733                 if (copy_from_user(&greq, optval, sizeof(struct group_req)))
 734                         break;
 735                 if (greq.gr_group.ss_family != AF_INET6) {
 736                         retv = -EADDRNOTAVAIL;
 737                         break;
 738                 }
 739                 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
 740                 if (optname == MCAST_JOIN_GROUP)
 741                         retv = ipv6_sock_mc_join(sk, greq.gr_interface,
 742                                                  &psin6->sin6_addr);
 743                 else
 744                         retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
 745                                                  &psin6->sin6_addr);
 746                 break;
 747         }
 748         case MCAST_JOIN_SOURCE_GROUP:
 749         case MCAST_LEAVE_SOURCE_GROUP:
 750         case MCAST_BLOCK_SOURCE:
 751         case MCAST_UNBLOCK_SOURCE:
 752         {
 753                 struct group_source_req greqs;
 754
 755                 if (optlen < sizeof(struct group_source_req))
 756                         goto e_inval;
 757                 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
 758                         retv = -EFAULT;
 759                         break;
 760                 }
 761                 retv = do_ipv6_mcast_group_source(sk, optname, &greqs);
 762                 break;
 763         }
 764         case MCAST_MSFILTER:
 765         {
 766                 struct group_filter *gsf;
 767
 768                 if (optlen < GROUP_FILTER_SIZE(0))
 769                         goto e_inval;
 770                 if (optlen > sysctl_optmem_max) {
 771                         retv = -ENOBUFS;
 772                         break;
 773                 }
 774                 gsf = memdup_user(optval, optlen);
 775                 if (IS_ERR(gsf)) {
 776                         retv = PTR_ERR(gsf);
 777                         break;
 778                 }
 779                 /* numsrc >= (4G-140)/128 overflow in 32 bits */
 780                 if (gsf->gf_numsrc >= 0x1ffffffU ||
 781                     gsf->gf_numsrc > sysctl_mld_max_msf) {
 782                         kfree(gsf);
 783                         retv = -ENOBUFS;
 784                         break;
 785                 }
 786                 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
 787                         kfree(gsf);
 788                         retv = -EINVAL;
 789                         break;
 790                 }
 791                 retv = ip6_mc_msfilter(sk, gsf, gsf->gf_slist);
 792                 kfree(gsf);
 793
 794                 break;
 795         }
 796         case IPV6_ROUTER_ALERT:
 797                 if (optlen < sizeof(int))
 798                         goto e_inval;
 799                 retv = ip6_ra_control(sk, val);
 800                 break;
 801         case IPV6_ROUTER_ALERT_ISOLATE:
 802                 if (optlen < sizeof(int))
 803                         goto e_inval;
 804                 np->rtalert_isolate = valbool;
 805                 retv = 0;
 806                 break;
 807         case IPV6_MTU_DISCOVER:
 808                 if (optlen < sizeof(int))
 809                         goto e_inval;
 810                 if (val < IPV6_PMTUDISC_DONT || val > IPV6_PMTUDISC_OMIT)
 811                         goto e_inval;
 812                 np->pmtudisc = val;
 813                 retv = 0;
 814                 break;
 815         case IPV6_MTU:
 816                 if (optlen < sizeof(int))
 817                         goto e_inval;
 818                 if (val && val < IPV6_MIN_MTU)
 819                         goto e_inval;
 820                 np->frag_size = val;
 821                 retv = 0;
 822                 break;
 823         case IPV6_RECVERR:
 824                 if (optlen < sizeof(int))
 825                         goto e_inval;
 826                 np->recverr = valbool;
 827                 if (!val)
 828                         skb_queue_purge(&sk->sk_error_queue);
 829                 retv = 0;
 830                 break;
 831         case IPV6_FLOWINFO_SEND:
 832                 if (optlen < sizeof(int))
 833                         goto e_inval;
 834                 np->sndflow = valbool;
 835                 retv = 0;
 836                 break;
 837         case IPV6_FLOWLABEL_MGR:
 838                 retv = ipv6_flowlabel_opt(sk, optval, optlen);
 839                 break;
 840         case IPV6_IPSEC_POLICY:
 841         case IPV6_XFRM_POLICY:
 842                 retv = -EPERM;
 843                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 844                         break;
 845                 retv = xfrm_user_policy(sk, optname, optval, optlen);
 846                 break;
 847
 848         case IPV6_ADDR_PREFERENCES:
 849                 if (optlen < sizeof(int))
 850                         goto e_inval;
 851                 retv = __ip6_sock_set_addr_preferences(sk, val);
 852                 break;
 853         case IPV6_MINHOPCOUNT:
 854                 if (optlen < sizeof(int))
 855                         goto e_inval;
 856                 if (val < 0 || val > 255)
 857                         goto e_inval;
 858                 np->min_hopcount = val;
 859                 retv = 0;
 860                 break;
 861         case IPV6_DONTFRAG:
 862                 np->dontfrag = valbool;
 863                 retv = 0;
 864                 break;
 865         case IPV6_AUTOFLOWLABEL:
 866                 np->autoflowlabel = valbool;
 867                 np->autoflowlabel_set = 1;
 868                 retv = 0;
 869                 break;
 870         case IPV6_RECVFRAGSIZE:
 871                 np->rxopt.bits.recvfragsize = valbool;
 872                 retv = 0;
 873                 break;
 874         }
 875
 876         release_sock(sk);
 877         if (needs_rtnl)
 878                 rtnl_unlock();
 879
 880         return retv;
 881
 882 e_inval:
 883         release_sock(sk);
 884         if (needs_rtnl)
 885                 rtnl_unlock();
 886         return -EINVAL;
 887 }
 888
 889 int ipv6_setsockopt(struct sock *sk, int level, int optname,
 890                     char __user *optval, unsigned int optlen)
 891 {
 892         int err;
 893
 894         if (level == SOL_IP && sk->sk_type != SOCK_RAW)
 895                 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
 896
 897         if (level != SOL_IPV6)
 898                 return -ENOPROTOOPT;
 899
 900         err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
 901 #ifdef CONFIG_NETFILTER
 902         /* we need to exclude all possible ENOPROTOOPTs except default case */
 903         if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
 904                         optname != IPV6_XFRM_POLICY)
 905                 err = nf_setsockopt(sk, PF_INET6, optname, optval, optlen);
 906 #endif
 907         return err;
 908 }
 909 EXPORT_SYMBOL(ipv6_setsockopt);
 910
 911 #ifdef CONFIG_COMPAT
 912 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
 913                            char __user *optval, unsigned int optlen)
 914 {
 915         int err;
 916
 917         if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
 918                 if (udp_prot.compat_setsockopt != NULL)
 919                         return udp_prot.compat_setsockopt(sk, level, optname,
 920                                                           optval, optlen);
 921                 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
 922         }
 923
 924         if (level != SOL_IPV6)
 925                 return -ENOPROTOOPT;
 926
 927         switch (optname) {
 928         case MCAST_JOIN_GROUP:
 929         case MCAST_LEAVE_GROUP:
 930         {
 931                 struct compat_group_req __user *gr32 = (void __user *)optval;
 932                 struct group_req greq;
 933                 struct sockaddr_in6 *psin6 = (struct sockaddr_in6 *)&greq.gr_group;
 934
 935                 if (optlen < sizeof(struct compat_group_req))
 936                         return -EINVAL;
 937
 938                 if (get_user(greq.gr_interface, &gr32->gr_interface) ||
 939                     copy_from_user(&greq.gr_group, &gr32->gr_group,
 940                                 sizeof(greq.gr_group)))
 941                         return -EFAULT;
 942
 943                 if (greq.gr_group.ss_family != AF_INET6)
 944                         return -EADDRNOTAVAIL;
 945
 946                 rtnl_lock();
 947                 lock_sock(sk);
 948                 if (optname == MCAST_JOIN_GROUP)
 949                         err = ipv6_sock_mc_join(sk, greq.gr_interface,
 950                                                  &psin6->sin6_addr);
 951                 else
 952                         err = ipv6_sock_mc_drop(sk, greq.gr_interface,
 953                                                  &psin6->sin6_addr);
 954                 release_sock(sk);
 955                 rtnl_unlock();
 956                 return err;
 957         }
 958         case MCAST_JOIN_SOURCE_GROUP:
 959         case MCAST_LEAVE_SOURCE_GROUP:
 960         case MCAST_BLOCK_SOURCE:
 961         case MCAST_UNBLOCK_SOURCE:
 962         {
 963                 struct compat_group_source_req __user *gsr32 = (void __user *)optval;
 964                 struct group_source_req greqs;
 965
 966                 if (optlen < sizeof(struct compat_group_source_req))
 967                         return -EINVAL;
 968
 969                 if (get_user(greqs.gsr_interface, &gsr32->gsr_interface) ||
 970                     copy_from_user(&greqs.gsr_group, &gsr32->gsr_group,
 971                                 sizeof(greqs.gsr_group)) ||
 972                     copy_from_user(&greqs.gsr_source, &gsr32->gsr_source,
 973                                 sizeof(greqs.gsr_source)))
 974                         return -EFAULT;
 975
 976                 rtnl_lock();
 977                 lock_sock(sk);
 978                 err = do_ipv6_mcast_group_source(sk, optname, &greqs);
 979                 release_sock(sk);
 980                 rtnl_unlock();
 981                 return err;
 982         }
 983         case MCAST_MSFILTER:
 984         {
 985                 const int size0 = offsetof(struct compat_group_filter, gf_slist);
 986                 struct compat_group_filter *gf32;
 987                 void *p;
 988                 int n;
 989
 990                 if (optlen < size0)
 991                         return -EINVAL;
 992                 if (optlen > sysctl_optmem_max - 4)
 993                         return -ENOBUFS;
 994
 995                 p = kmalloc(optlen + 4, GFP_KERNEL);
 996                 if (!p)
 997                         return -ENOMEM;
 998
 999                 gf32 = p + 4; /* we want ->gf_group and ->gf_slist aligned */
1000                 if (copy_from_user(gf32, optval, optlen)) {
1001                         err = -EFAULT;
1002                         goto mc_msf_out;
1003                 }
1004
1005                 n = gf32->gf_numsrc;
1006                 /* numsrc >= (4G-140)/128 overflow in 32 bits */
1007                 if (n >= 0x1ffffffU ||
1008                     n > sysctl_mld_max_msf) {
1009                         err = -ENOBUFS;
1010                         goto mc_msf_out;
1011                 }
1012                 if (offsetof(struct compat_group_filter, gf_slist[n]) > optlen) {
1013                         err = -EINVAL;
1014                         goto mc_msf_out;
1015                 }
1016
1017                 rtnl_lock();
1018                 lock_sock(sk);
1019                 err = ip6_mc_msfilter(sk, &(struct group_filter){
1020                                 .gf_interface = gf32->gf_interface,
1021                                 .gf_group = gf32->gf_group,
1022                                 .gf_fmode = gf32->gf_fmode,
1023                                 .gf_numsrc = gf32->gf_numsrc}, gf32->gf_slist);
1024                 release_sock(sk);
1025                 rtnl_unlock();
1026 mc_msf_out:
1027                 kfree(p);
1028                 return err;
1029         }
1030         }
1031
1032         err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
1033 #ifdef CONFIG_NETFILTER
1034         /* we need to exclude all possible ENOPROTOOPTs except default case */
1035         if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
1036             optname != IPV6_XFRM_POLICY)
1037                 err = compat_nf_setsockopt(sk, PF_INET6, optname, optval,
1038                                            optlen);
1039 #endif
1040         return err;
1041 }
1042 EXPORT_SYMBOL(compat_ipv6_setsockopt);
1043 #endif
1044
1045 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
1046                                   int optname, char __user *optval, int len)
1047 {
1048         struct ipv6_opt_hdr *hdr;
1049
1050         if (!opt)
1051                 return 0;
1052
1053         switch (optname) {
1054         case IPV6_HOPOPTS:
1055                 hdr = opt->hopopt;
1056                 break;
1057         case IPV6_RTHDRDSTOPTS:
1058                 hdr = opt->dst0opt;
1059                 break;
1060         case IPV6_RTHDR:
1061                 hdr = (struct ipv6_opt_hdr *)opt->srcrt;
1062                 break;
1063         case IPV6_DSTOPTS:
1064                 hdr = opt->dst1opt;
1065                 break;
1066         default:
1067                 return -EINVAL; /* should not happen */
1068         }
1069
1070         if (!hdr)
1071                 return 0;
1072
1073         len = min_t(unsigned int, len, ipv6_optlen(hdr));
1074         if (copy_to_user(optval, hdr, len))
1075                 return -EFAULT;
1076         return len;
1077 }
1078
1079 static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
1080                     char __user *optval, int __user *optlen, unsigned int flags)
1081 {
1082         struct ipv6_pinfo *np = inet6_sk(sk);
1083         int len;
1084         int val;
1085
1086         if (ip6_mroute_opt(optname))
1087                 return ip6_mroute_getsockopt(sk, optname, optval, optlen);
1088
1089         if (get_user(len, optlen))
1090                 return -EFAULT;
1091         switch (optname) {
1092         case IPV6_ADDRFORM:
1093                 if (sk->sk_protocol != IPPROTO_UDP &&
1094                     sk->sk_protocol != IPPROTO_UDPLITE &&
1095                     sk->sk_protocol != IPPROTO_TCP)
1096                         return -ENOPROTOOPT;
1097                 if (sk->sk_state != TCP_ESTABLISHED)
1098                         return -ENOTCONN;
1099                 val = sk->sk_family;
1100                 break;
1101         case MCAST_MSFILTER:
1102         {
1103                 struct group_filter __user *p = (void __user *)optval;
1104                 struct group_filter gsf;
1105                 const int size0 = offsetof(struct group_filter, gf_slist);
1106                 int num;
1107                 int err;
1108
1109                 if (len < size0)
1110                         return -EINVAL;
1111                 if (copy_from_user(&gsf, p, size0))
1112                         return -EFAULT;
1113                 if (gsf.gf_group.ss_family != AF_INET6)
1114                         return -EADDRNOTAVAIL;
1115                 num = gsf.gf_numsrc;
1116                 lock_sock(sk);
1117                 err = ip6_mc_msfget(sk, &gsf, p->gf_slist);
1118                 if (!err) {
1119                         if (num > gsf.gf_numsrc)
1120                                 num = gsf.gf_numsrc;
1121                         if (put_user(GROUP_FILTER_SIZE(num), optlen) ||
1122                             copy_to_user(p, &gsf, size0))
1123                                 err = -EFAULT;
1124                 }
1125                 release_sock(sk);
1126                 return err;
1127         }
1128
1129         case IPV6_2292PKTOPTIONS:
1130         {
1131                 struct msghdr msg;
1132                 struct sk_buff *skb;
1133
1134                 if (sk->sk_type != SOCK_STREAM)
1135                         return -ENOPROTOOPT;
1136
1137                 msg.msg_control = optval;
1138                 msg.msg_controllen = len;
1139                 msg.msg_flags = flags;
1140                 msg.msg_control_is_user = true;
1141
1142                 lock_sock(sk);
1143                 skb = np->pktoptions;
1144                 if (skb)
1145                         ip6_datagram_recv_ctl(sk, &msg, skb);
1146                 release_sock(sk);
1147                 if (!skb) {
1148                         if (np->rxopt.bits.rxinfo) {
1149                                 struct in6_pktinfo src_info;
1150                                 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
1151                                         np->sticky_pktinfo.ipi6_ifindex;
1152                                 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr : np->sticky_pktinfo.ipi6_addr;
1153                                 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
1154                         }
1155                         if (np->rxopt.bits.rxhlim) {
1156                                 int hlim = np->mcast_hops;
1157                                 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
1158                         }
1159                         if (np->rxopt.bits.rxtclass) {
1160                                 int tclass = (int)ip6_tclass(np->rcv_flowinfo);
1161
1162                                 put_cmsg(&msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
1163                         }
1164                         if (np->rxopt.bits.rxoinfo) {
1165                                 struct in6_pktinfo src_info;
1166                                 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
1167                                         np->sticky_pktinfo.ipi6_ifindex;
1168                                 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr :
1169                                                                      np->sticky_pktinfo.ipi6_addr;
1170                                 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
1171                         }
1172                         if (np->rxopt.bits.rxohlim) {
1173                                 int hlim = np->mcast_hops;
1174                                 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
1175                         }
1176                         if (np->rxopt.bits.rxflow) {
1177                                 __be32 flowinfo = np->rcv_flowinfo;
1178
1179                                 put_cmsg(&msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
1180                         }
1181                 }
1182                 len -= msg.msg_controllen;
1183                 return put_user(len, optlen);
1184         }
1185         case IPV6_MTU:
1186         {
1187                 struct dst_entry *dst;
1188
1189                 val = 0;
1190                 rcu_read_lock();
1191                 dst = __sk_dst_get(sk);
1192                 if (dst)
1193                         val = dst_mtu(dst);
1194                 rcu_read_unlock();
1195                 if (!val)
1196                         return -ENOTCONN;
1197                 break;
1198         }
1199
1200         case IPV6_V6ONLY:
1201                 val = sk->sk_ipv6only;
1202                 break;
1203
1204         case IPV6_RECVPKTINFO:
1205                 val = np->rxopt.bits.rxinfo;
1206                 break;
1207
1208         case IPV6_2292PKTINFO:
1209                 val = np->rxopt.bits.rxoinfo;
1210                 break;
1211
1212         case IPV6_RECVHOPLIMIT:
1213                 val = np->rxopt.bits.rxhlim;
1214                 break;
1215
1216         case IPV6_2292HOPLIMIT:
1217                 val = np->rxopt.bits.rxohlim;
1218                 break;
1219
1220         case IPV6_RECVRTHDR:
1221                 val = np->rxopt.bits.srcrt;
1222                 break;
1223
1224         case IPV6_2292RTHDR:
1225                 val = np->rxopt.bits.osrcrt;
1226                 break;
1227
1228         case IPV6_HOPOPTS:
1229         case IPV6_RTHDRDSTOPTS:
1230         case IPV6_RTHDR:
1231         case IPV6_DSTOPTS:
1232         {
1233                 struct ipv6_txoptions *opt;
1234
1235                 lock_sock(sk);
1236                 opt = rcu_dereference_protected(np->opt,
1237                                                 lockdep_sock_is_held(sk));
1238                 len = ipv6_getsockopt_sticky(sk, opt, optname, optval, len);
1239                 release_sock(sk);
1240                 /* check if ipv6_getsockopt_sticky() returns err code */
1241                 if (len < 0)
1242                         return len;
1243                 return put_user(len, optlen);
1244         }
1245
1246         case IPV6_RECVHOPOPTS:
1247                 val = np->rxopt.bits.hopopts;
1248                 break;
1249
1250         case IPV6_2292HOPOPTS:
1251                 val = np->rxopt.bits.ohopopts;
1252                 break;
1253
1254         case IPV6_RECVDSTOPTS:
1255                 val = np->rxopt.bits.dstopts;
1256                 break;
1257
1258         case IPV6_2292DSTOPTS:
1259                 val = np->rxopt.bits.odstopts;
1260                 break;
1261
1262         case IPV6_TCLASS:
1263                 val = np->tclass;
1264                 break;
1265
1266         case IPV6_RECVTCLASS:
1267                 val = np->rxopt.bits.rxtclass;
1268                 break;
1269
1270         case IPV6_FLOWINFO:
1271                 val = np->rxopt.bits.rxflow;
1272                 break;
1273
1274         case IPV6_RECVPATHMTU:
1275                 val = np->rxopt.bits.rxpmtu;
1276                 break;
1277
1278         case IPV6_PATHMTU:
1279         {
1280                 struct dst_entry *dst;
1281                 struct ip6_mtuinfo mtuinfo;
1282
1283                 if (len < sizeof(mtuinfo))
1284                         return -EINVAL;
1285
1286                 len = sizeof(mtuinfo);
1287                 memset(&mtuinfo, 0, sizeof(mtuinfo));
1288
1289                 rcu_read_lock();
1290                 dst = __sk_dst_get(sk);
1291                 if (dst)
1292                         mtuinfo.ip6m_mtu = dst_mtu(dst);
1293                 rcu_read_unlock();
1294                 if (!mtuinfo.ip6m_mtu)
1295                         return -ENOTCONN;
1296
1297                 if (put_user(len, optlen))
1298                         return -EFAULT;
1299                 if (copy_to_user(optval, &mtuinfo, len))
1300                         return -EFAULT;
1301
1302                 return 0;
1303         }
1304
1305         case IPV6_TRANSPARENT:
1306                 val = inet_sk(sk)->transparent;
1307                 break;
1308
1309         case IPV6_FREEBIND:
1310                 val = inet_sk(sk)->freebind;
1311                 break;
1312
1313         case IPV6_RECVORIGDSTADDR:
1314                 val = np->rxopt.bits.rxorigdstaddr;
1315                 break;
1316
1317         case IPV6_UNICAST_HOPS:
1318         case IPV6_MULTICAST_HOPS:
1319         {
1320                 struct dst_entry *dst;
1321
1322                 if (optname == IPV6_UNICAST_HOPS)
1323                         val = np->hop_limit;
1324                 else
1325                         val = np->mcast_hops;
1326
1327                 if (val < 0) {
1328                         rcu_read_lock();
1329                         dst = __sk_dst_get(sk);
1330                         if (dst)
1331                                 val = ip6_dst_hoplimit(dst);
1332                         rcu_read_unlock();
1333                 }
1334
1335                 if (val < 0)
1336                         val = sock_net(sk)->ipv6.devconf_all->hop_limit;
1337                 break;
1338         }
1339
1340         case IPV6_MULTICAST_LOOP:
1341                 val = np->mc_loop;
1342                 break;
1343
1344         case IPV6_MULTICAST_IF:
1345                 val = np->mcast_oif;
1346                 break;
1347
1348         case IPV6_MULTICAST_ALL:
1349                 val = np->mc_all;
1350                 break;
1351
1352         case IPV6_UNICAST_IF:
1353                 val = (__force int)htonl((__u32) np->ucast_oif);
1354                 break;
1355
1356         case IPV6_MTU_DISCOVER:
1357                 val = np->pmtudisc;
1358                 break;
1359
1360         case IPV6_RECVERR:
1361                 val = np->recverr;
1362                 break;
1363
1364         case IPV6_FLOWINFO_SEND:
1365                 val = np->sndflow;
1366                 break;
1367
1368         case IPV6_FLOWLABEL_MGR:
1369         {
1370                 struct in6_flowlabel_req freq;
1371                 int flags;
1372
1373                 if (len < sizeof(freq))
1374                         return -EINVAL;
1375
1376                 if (copy_from_user(&freq, optval, sizeof(freq)))
1377                         return -EFAULT;
1378
1379                 if (freq.flr_action != IPV6_FL_A_GET)
1380                         return -EINVAL;
1381
1382                 len = sizeof(freq);
1383                 flags = freq.flr_flags;
1384
1385                 memset(&freq, 0, sizeof(freq));
1386
1387                 val = ipv6_flowlabel_opt_get(sk, &freq, flags);
1388                 if (val < 0)
1389                         return val;
1390
1391                 if (put_user(len, optlen))
1392                         return -EFAULT;
1393                 if (copy_to_user(optval, &freq, len))
1394                         return -EFAULT;
1395
1396                 return 0;
1397         }
1398
1399         case IPV6_ADDR_PREFERENCES:
1400                 val = 0;
1401
1402                 if (np->srcprefs & IPV6_PREFER_SRC_TMP)
1403                         val |= IPV6_PREFER_SRC_TMP;
1404                 else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC)
1405                         val |= IPV6_PREFER_SRC_PUBLIC;
1406                 else {
1407                         /* XXX: should we return system default? */
1408                         val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT;
1409                 }
1410
1411                 if (np->srcprefs & IPV6_PREFER_SRC_COA)
1412                         val |= IPV6_PREFER_SRC_COA;
1413                 else
1414                         val |= IPV6_PREFER_SRC_HOME;
1415                 break;
1416
1417         case IPV6_MINHOPCOUNT:
1418                 val = np->min_hopcount;
1419                 break;
1420
1421         case IPV6_DONTFRAG:
1422                 val = np->dontfrag;
1423                 break;
1424
1425         case IPV6_AUTOFLOWLABEL:
1426                 val = ip6_autoflowlabel(sock_net(sk), np);
1427                 break;
1428
1429         case IPV6_RECVFRAGSIZE:
1430                 val = np->rxopt.bits.recvfragsize;
1431                 break;
1432
1433         case IPV6_ROUTER_ALERT_ISOLATE:
1434                 val = np->rtalert_isolate;
1435                 break;
1436
1437         default:
1438                 return -ENOPROTOOPT;
1439         }
1440         len = min_t(unsigned int, sizeof(int), len);
1441         if (put_user(len, optlen))
1442                 return -EFAULT;
1443         if (copy_to_user(optval, &val, len))
1444                 return -EFAULT;
1445         return 0;
1446 }
1447
1448 int ipv6_getsockopt(struct sock *sk, int level, int optname,
1449                     char __user *optval, int __user *optlen)
1450 {
1451         int err;
1452
1453         if (level == SOL_IP && sk->sk_type != SOCK_RAW)
1454                 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1455
1456         if (level != SOL_IPV6)
1457                 return -ENOPROTOOPT;
1458
1459         err = do_ipv6_getsockopt(sk, level, optname, optval, optlen, 0);
1460 #ifdef CONFIG_NETFILTER
1461         /* we need to exclude all possible ENOPROTOOPTs except default case */
1462         if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1463                 int len;
1464
1465                 if (get_user(len, optlen))
1466                         return -EFAULT;
1467
1468                 err = nf_getsockopt(sk, PF_INET6, optname, optval, &len);
1469                 if (err >= 0)
1470                         err = put_user(len, optlen);
1471         }
1472 #endif
1473         return err;
1474 }
1475 EXPORT_SYMBOL(ipv6_getsockopt);
1476
1477 #ifdef CONFIG_COMPAT
1478 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
1479                            char __user *optval, int __user *optlen)
1480 {
1481         int err;
1482
1483         if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
1484                 if (udp_prot.compat_getsockopt != NULL)
1485                         return udp_prot.compat_getsockopt(sk, level, optname,
1486                                                           optval, optlen);
1487                 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1488         }
1489
1490         if (level != SOL_IPV6)
1491                 return -ENOPROTOOPT;
1492
1493         if (optname == MCAST_MSFILTER) {
1494                 const int size0 = offsetof(struct compat_group_filter, gf_slist);
1495                 struct compat_group_filter __user *p = (void __user *)optval;
1496                 struct compat_group_filter gf32;
1497                 struct group_filter gf;
1498                 int ulen, err;
1499                 int num;
1500
1501                 if (get_user(ulen, optlen))
1502                         return -EFAULT;
1503
1504                 if (ulen < size0)
1505                         return -EINVAL;
1506
1507                 if (copy_from_user(&gf32, p, size0))
1508                         return -EFAULT;
1509
1510                 gf.gf_interface = gf32.gf_interface;
1511                 gf.gf_fmode = gf32.gf_fmode;
1512                 num = gf.gf_numsrc = gf32.gf_numsrc;
1513                 gf.gf_group = gf32.gf_group;
1514
1515                 if (gf.gf_group.ss_family != AF_INET6)
1516                         return -EADDRNOTAVAIL;
1517                 lock_sock(sk);
1518                 err = ip6_mc_msfget(sk, &gf, p->gf_slist);
1519                 release_sock(sk);
1520                 if (err)
1521                         return err;
1522                 if (num > gf.gf_numsrc)
1523                         num = gf.gf_numsrc;
1524                 ulen = GROUP_FILTER_SIZE(num) - (sizeof(gf)-sizeof(gf32));
1525                 if (put_user(ulen, optlen) ||
1526                     put_user(gf.gf_fmode, &p->gf_fmode) ||
1527                     put_user(gf.gf_numsrc, &p->gf_numsrc))
1528                         return -EFAULT;
1529                 return 0;
1530         }
1531
1532         err = do_ipv6_getsockopt(sk, level, optname, optval, optlen,
1533                                  MSG_CMSG_COMPAT);
1534 #ifdef CONFIG_NETFILTER
1535         /* we need to exclude all possible ENOPROTOOPTs except default case */
1536         if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1537                 int len;
1538
1539                 if (get_user(len, optlen))
1540                         return -EFAULT;
1541
1542                 err = compat_nf_getsockopt(sk, PF_INET6, optname, optval, &len);
1543                 if (err >= 0)
1544                         err = put_user(len, optlen);
1545         }
1546 #endif
1547         return err;
1548 }
1549 EXPORT_SYMBOL(compat_ipv6_getsockopt);
1550 #endif