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 DEFINE_STATIC_KEY_FALSE(ip6_min_hopcount);
  59
  60 int ip6_ra_control(struct sock *sk, int sel)
  61 {
  62         struct ip6_ra_chain *ra, *new_ra, **rap;
  63
  64         /* RA packet may be delivered ONLY to IPPROTO_RAW socket */
  65         if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num != IPPROTO_RAW)
  66                 return -ENOPROTOOPT;
  67
  68         new_ra = (sel >= 0) ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
  69         if (sel >= 0 && !new_ra)
  70                 return -ENOMEM;
  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) {
  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 struct ipv6_txoptions *ipv6_update_options(struct sock *sk,
 103                                            struct ipv6_txoptions *opt)
 104 {
 105         if (inet_sk(sk)->is_icsk) {
 106                 if (opt &&
 107                     !((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) &&
 108                     inet_sk(sk)->inet_daddr != LOOPBACK4_IPV6) {
 109                         struct inet_connection_sock *icsk = inet_csk(sk);
 110                         icsk->icsk_ext_hdr_len = opt->opt_flen + opt->opt_nflen;
 111                         icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
 112                 }
 113         }
 114         opt = xchg((__force struct ipv6_txoptions **)&inet6_sk(sk)->opt,
 115                    opt);
 116         sk_dst_reset(sk);
 117
 118         return opt;
 119 }
 120
 121 static bool setsockopt_needs_rtnl(int optname)
 122 {
 123         switch (optname) {
 124         case IPV6_ADDRFORM:
 125         case IPV6_ADD_MEMBERSHIP:
 126         case IPV6_DROP_MEMBERSHIP:
 127         case IPV6_JOIN_ANYCAST:
 128         case IPV6_LEAVE_ANYCAST:
 129         case MCAST_JOIN_GROUP:
 130         case MCAST_LEAVE_GROUP:
 131         case MCAST_JOIN_SOURCE_GROUP:
 132         case MCAST_LEAVE_SOURCE_GROUP:
 133         case MCAST_BLOCK_SOURCE:
 134         case MCAST_UNBLOCK_SOURCE:
 135         case MCAST_MSFILTER:
 136                 return true;
 137         }
 138         return false;
 139 }
 140
 141 static int copy_group_source_from_sockptr(struct group_source_req *greqs,
 142                 sockptr_t optval, int optlen)
 143 {
 144         if (in_compat_syscall()) {
 145                 struct compat_group_source_req gr32;
 146
 147                 if (optlen < sizeof(gr32))
 148                         return -EINVAL;
 149                 if (copy_from_sockptr(&gr32, optval, sizeof(gr32)))
 150                         return -EFAULT;
 151                 greqs->gsr_interface = gr32.gsr_interface;
 152                 greqs->gsr_group = gr32.gsr_group;
 153                 greqs->gsr_source = gr32.gsr_source;
 154         } else {
 155                 if (optlen < sizeof(*greqs))
 156                         return -EINVAL;
 157                 if (copy_from_sockptr(greqs, optval, sizeof(*greqs)))
 158                         return -EFAULT;
 159         }
 160
 161         return 0;
 162 }
 163
 164 static int do_ipv6_mcast_group_source(struct sock *sk, int optname,
 165                 sockptr_t optval, int optlen)
 166 {
 167         struct group_source_req greqs;
 168         int omode, add;
 169         int ret;
 170
 171         ret = copy_group_source_from_sockptr(&greqs, optval, optlen);
 172         if (ret)
 173                 return ret;
 174
 175         if (greqs.gsr_group.ss_family != AF_INET6 ||
 176             greqs.gsr_source.ss_family != AF_INET6)
 177                 return -EADDRNOTAVAIL;
 178
 179         if (optname == MCAST_BLOCK_SOURCE) {
 180                 omode = MCAST_EXCLUDE;
 181                 add = 1;
 182         } else if (optname == MCAST_UNBLOCK_SOURCE) {
 183                 omode = MCAST_EXCLUDE;
 184                 add = 0;
 185         } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
 186                 struct sockaddr_in6 *psin6;
 187                 int retv;
 188
 189                 psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
 190                 retv = ipv6_sock_mc_join_ssm(sk, greqs.gsr_interface,
 191                                              &psin6->sin6_addr,
 192                                              MCAST_INCLUDE);
 193                 /* prior join w/ different source is ok */
 194                 if (retv && retv != -EADDRINUSE)
 195                         return retv;
 196                 omode = MCAST_INCLUDE;
 197                 add = 1;
 198         } else /* MCAST_LEAVE_SOURCE_GROUP */ {
 199                 omode = MCAST_INCLUDE;
 200                 add = 0;
 201         }
 202         return ip6_mc_source(add, omode, sk, &greqs);
 203 }
 204
 205 static int ipv6_set_mcast_msfilter(struct sock *sk, sockptr_t optval,
 206                 int optlen)
 207 {
 208         struct group_filter *gsf;
 209         int ret;
 210
 211         if (optlen < GROUP_FILTER_SIZE(0))
 212                 return -EINVAL;
 213         if (optlen > sysctl_optmem_max)
 214                 return -ENOBUFS;
 215
 216         gsf = memdup_sockptr(optval, optlen);
 217         if (IS_ERR(gsf))
 218                 return PTR_ERR(gsf);
 219
 220         /* numsrc >= (4G-140)/128 overflow in 32 bits */
 221         ret = -ENOBUFS;
 222         if (gsf->gf_numsrc >= 0x1ffffffU ||
 223             gsf->gf_numsrc > sysctl_mld_max_msf)
 224                 goto out_free_gsf;
 225
 226         ret = -EINVAL;
 227         if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen)
 228                 goto out_free_gsf;
 229
 230         ret = ip6_mc_msfilter(sk, gsf, gsf->gf_slist_flex);
 231 out_free_gsf:
 232         kfree(gsf);
 233         return ret;
 234 }
 235
 236 static int compat_ipv6_set_mcast_msfilter(struct sock *sk, sockptr_t optval,
 237                 int optlen)
 238 {
 239         const int size0 = offsetof(struct compat_group_filter, gf_slist_flex);
 240         struct compat_group_filter *gf32;
 241         void *p;
 242         int ret;
 243         int n;
 244
 245         if (optlen < size0)
 246                 return -EINVAL;
 247         if (optlen > sysctl_optmem_max - 4)
 248                 return -ENOBUFS;
 249
 250         p = kmalloc(optlen + 4, GFP_KERNEL);
 251         if (!p)
 252                 return -ENOMEM;
 253
 254         gf32 = p + 4; /* we want ->gf_group and ->gf_slist_flex aligned */
 255         ret = -EFAULT;
 256         if (copy_from_sockptr(gf32, optval, optlen))
 257                 goto out_free_p;
 258
 259         /* numsrc >= (4G-140)/128 overflow in 32 bits */
 260         ret = -ENOBUFS;
 261         n = gf32->gf_numsrc;
 262         if (n >= 0x1ffffffU || n > sysctl_mld_max_msf)
 263                 goto out_free_p;
 264
 265         ret = -EINVAL;
 266         if (offsetof(struct compat_group_filter, gf_slist_flex[n]) > optlen)
 267                 goto out_free_p;
 268
 269         ret = ip6_mc_msfilter(sk, &(struct group_filter){
 270                         .gf_interface = gf32->gf_interface,
 271                         .gf_group = gf32->gf_group,
 272                         .gf_fmode = gf32->gf_fmode,
 273                         .gf_numsrc = gf32->gf_numsrc}, gf32->gf_slist_flex);
 274
 275 out_free_p:
 276         kfree(p);
 277         return ret;
 278 }
 279
 280 static int ipv6_mcast_join_leave(struct sock *sk, int optname,
 281                 sockptr_t optval, int optlen)
 282 {
 283         struct sockaddr_in6 *psin6;
 284         struct group_req greq;
 285
 286         if (optlen < sizeof(greq))
 287                 return -EINVAL;
 288         if (copy_from_sockptr(&greq, optval, sizeof(greq)))
 289                 return -EFAULT;
 290
 291         if (greq.gr_group.ss_family != AF_INET6)
 292                 return -EADDRNOTAVAIL;
 293         psin6 = (struct sockaddr_in6 *)&greq.gr_group;
 294         if (optname == MCAST_JOIN_GROUP)
 295                 return ipv6_sock_mc_join(sk, greq.gr_interface,
 296                                          &psin6->sin6_addr);
 297         return ipv6_sock_mc_drop(sk, greq.gr_interface, &psin6->sin6_addr);
 298 }
 299
 300 static int compat_ipv6_mcast_join_leave(struct sock *sk, int optname,
 301                 sockptr_t optval, int optlen)
 302 {
 303         struct compat_group_req gr32;
 304         struct sockaddr_in6 *psin6;
 305
 306         if (optlen < sizeof(gr32))
 307                 return -EINVAL;
 308         if (copy_from_sockptr(&gr32, optval, sizeof(gr32)))
 309                 return -EFAULT;
 310
 311         if (gr32.gr_group.ss_family != AF_INET6)
 312                 return -EADDRNOTAVAIL;
 313         psin6 = (struct sockaddr_in6 *)&gr32.gr_group;
 314         if (optname == MCAST_JOIN_GROUP)
 315                 return ipv6_sock_mc_join(sk, gr32.gr_interface,
 316                                         &psin6->sin6_addr);
 317         return ipv6_sock_mc_drop(sk, gr32.gr_interface, &psin6->sin6_addr);
 318 }
 319
 320 static int ipv6_set_opt_hdr(struct sock *sk, int optname, sockptr_t optval,
 321                 int optlen)
 322 {
 323         struct ipv6_pinfo *np = inet6_sk(sk);
 324         struct ipv6_opt_hdr *new = NULL;
 325         struct net *net = sock_net(sk);
 326         struct ipv6_txoptions *opt;
 327         int err;
 328
 329         /* hop-by-hop / destination options are privileged option */
 330         if (optname != IPV6_RTHDR && !ns_capable(net->user_ns, CAP_NET_RAW))
 331                 return -EPERM;
 332
 333         /* remove any sticky options header with a zero option
 334          * length, per RFC3542.
 335          */
 336         if (optlen > 0) {
 337                 if (sockptr_is_null(optval))
 338                         return -EINVAL;
 339                 if (optlen < sizeof(struct ipv6_opt_hdr) ||
 340                     optlen & 0x7 ||
 341                     optlen > 8 * 255)
 342                         return -EINVAL;
 343
 344                 new = memdup_sockptr(optval, optlen);
 345                 if (IS_ERR(new))
 346                         return PTR_ERR(new);
 347                 if (unlikely(ipv6_optlen(new) > optlen)) {
 348                         kfree(new);
 349                         return -EINVAL;
 350                 }
 351         }
 352
 353         opt = rcu_dereference_protected(np->opt, lockdep_sock_is_held(sk));
 354         opt = ipv6_renew_options(sk, opt, optname, new);
 355         kfree(new);
 356         if (IS_ERR(opt))
 357                 return PTR_ERR(opt);
 358
 359         /* routing header option needs extra check */
 360         err = -EINVAL;
 361         if (optname == IPV6_RTHDR && opt && opt->srcrt) {
 362                 struct ipv6_rt_hdr *rthdr = opt->srcrt;
 363                 switch (rthdr->type) {
 364 #if IS_ENABLED(CONFIG_IPV6_MIP6)
 365                 case IPV6_SRCRT_TYPE_2:
 366                         if (rthdr->hdrlen != 2 || rthdr->segments_left != 1)
 367                                 goto sticky_done;
 368                         break;
 369 #endif
 370                 case IPV6_SRCRT_TYPE_4:
 371                 {
 372                         struct ipv6_sr_hdr *srh =
 373                                 (struct ipv6_sr_hdr *)opt->srcrt;
 374
 375                         if (!seg6_validate_srh(srh, optlen, false))
 376                                 goto sticky_done;
 377                         break;
 378                 }
 379                 default:
 380                         goto sticky_done;
 381                 }
 382         }
 383
 384         err = 0;
 385         opt = ipv6_update_options(sk, opt);
 386 sticky_done:
 387         if (opt) {
 388                 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
 389                 txopt_put(opt);
 390         }
 391         return err;
 392 }
 393
 394 static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
 395                    sockptr_t optval, unsigned int optlen)
 396 {
 397         struct ipv6_pinfo *np = inet6_sk(sk);
 398         struct net *net = sock_net(sk);
 399         int val, valbool;
 400         int retv = -ENOPROTOOPT;
 401         bool needs_rtnl = setsockopt_needs_rtnl(optname);
 402
 403         if (sockptr_is_null(optval))
 404                 val = 0;
 405         else {
 406                 if (optlen >= sizeof(int)) {
 407                         if (copy_from_sockptr(&val, optval, sizeof(val)))
 408                                 return -EFAULT;
 409                 } else
 410                         val = 0;
 411         }
 412
 413         valbool = (val != 0);
 414
 415         if (ip6_mroute_opt(optname))
 416                 return ip6_mroute_setsockopt(sk, optname, optval, optlen);
 417
 418         if (needs_rtnl)
 419                 rtnl_lock();
 420         lock_sock(sk);
 421
 422         switch (optname) {
 423
 424         case IPV6_ADDRFORM:
 425                 if (optlen < sizeof(int))
 426                         goto e_inval;
 427                 if (val == PF_INET) {
 428                         struct ipv6_txoptions *opt;
 429                         struct sk_buff *pktopt;
 430
 431                         if (sk->sk_type == SOCK_RAW)
 432                                 break;
 433
 434                         if (sk->sk_protocol == IPPROTO_UDP ||
 435                             sk->sk_protocol == IPPROTO_UDPLITE) {
 436                                 struct udp_sock *up = udp_sk(sk);
 437                                 if (up->pending == AF_INET6) {
 438                                         retv = -EBUSY;
 439                                         break;
 440                                 }
 441                         } else if (sk->sk_protocol == IPPROTO_TCP) {
 442                                 if (sk->sk_prot != &tcpv6_prot) {
 443                                         retv = -EBUSY;
 444                                         break;
 445                                 }
 446                         } else {
 447                                 break;
 448                         }
 449
 450                         if (sk->sk_state != TCP_ESTABLISHED) {
 451                                 retv = -ENOTCONN;
 452                                 break;
 453                         }
 454
 455                         if (ipv6_only_sock(sk) ||
 456                             !ipv6_addr_v4mapped(&sk->sk_v6_daddr)) {
 457                                 retv = -EADDRNOTAVAIL;
 458                                 break;
 459                         }
 460
 461                         fl6_free_socklist(sk);
 462                         __ipv6_sock_mc_close(sk);
 463                         __ipv6_sock_ac_close(sk);
 464
 465                         /*
 466                          * Sock is moving from IPv6 to IPv4 (sk_prot), so
 467                          * remove it from the refcnt debug socks count in the
 468                          * original family...
 469                          */
 470                         sk_refcnt_debug_dec(sk);
 471
 472                         if (sk->sk_protocol == IPPROTO_TCP) {
 473                                 struct inet_connection_sock *icsk = inet_csk(sk);
 474
 475                                 sock_prot_inuse_add(net, sk->sk_prot, -1);
 476                                 sock_prot_inuse_add(net, &tcp_prot, 1);
 477
 478                                 sk->sk_prot = &tcp_prot;
 479                                 icsk->icsk_af_ops = &ipv4_specific;
 480                                 sk->sk_socket->ops = &inet_stream_ops;
 481                                 sk->sk_family = PF_INET;
 482                                 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
 483                         } else {
 484                                 struct proto *prot = &udp_prot;
 485
 486                                 if (sk->sk_protocol == IPPROTO_UDPLITE)
 487                                         prot = &udplite_prot;
 488
 489                                 sock_prot_inuse_add(net, sk->sk_prot, -1);
 490                                 sock_prot_inuse_add(net, prot, 1);
 491
 492                                 sk->sk_prot = prot;
 493                                 sk->sk_socket->ops = &inet_dgram_ops;
 494                                 sk->sk_family = PF_INET;
 495                         }
 496                         opt = xchg((__force struct ipv6_txoptions **)&np->opt,
 497                                    NULL);
 498                         if (opt) {
 499                                 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
 500                                 txopt_put(opt);
 501                         }
 502                         pktopt = xchg(&np->pktoptions, NULL);
 503                         kfree_skb(pktopt);
 504
 505                         /*
 506                          * ... and add it to the refcnt debug socks count
 507                          * in the new family. -acme
 508                          */
 509                         sk_refcnt_debug_inc(sk);
 510                         module_put(THIS_MODULE);
 511                         retv = 0;
 512                         break;
 513                 }
 514                 goto e_inval;
 515
 516         case IPV6_V6ONLY:
 517                 if (optlen < sizeof(int) ||
 518                     inet_sk(sk)->inet_num)
 519                         goto e_inval;
 520                 sk->sk_ipv6only = valbool;
 521                 retv = 0;
 522                 break;
 523
 524         case IPV6_RECVPKTINFO:
 525                 if (optlen < sizeof(int))
 526                         goto e_inval;
 527                 np->rxopt.bits.rxinfo = valbool;
 528                 retv = 0;
 529                 break;
 530
 531         case IPV6_2292PKTINFO:
 532                 if (optlen < sizeof(int))
 533                         goto e_inval;
 534                 np->rxopt.bits.rxoinfo = valbool;
 535                 retv = 0;
 536                 break;
 537
 538         case IPV6_RECVHOPLIMIT:
 539                 if (optlen < sizeof(int))
 540                         goto e_inval;
 541                 np->rxopt.bits.rxhlim = valbool;
 542                 retv = 0;
 543                 break;
 544
 545         case IPV6_2292HOPLIMIT:
 546                 if (optlen < sizeof(int))
 547                         goto e_inval;
 548                 np->rxopt.bits.rxohlim = valbool;
 549                 retv = 0;
 550                 break;
 551
 552         case IPV6_RECVRTHDR:
 553                 if (optlen < sizeof(int))
 554                         goto e_inval;
 555                 np->rxopt.bits.srcrt = valbool;
 556                 retv = 0;
 557                 break;
 558
 559         case IPV6_2292RTHDR:
 560                 if (optlen < sizeof(int))
 561                         goto e_inval;
 562                 np->rxopt.bits.osrcrt = valbool;
 563                 retv = 0;
 564                 break;
 565
 566         case IPV6_RECVHOPOPTS:
 567                 if (optlen < sizeof(int))
 568                         goto e_inval;
 569                 np->rxopt.bits.hopopts = valbool;
 570                 retv = 0;
 571                 break;
 572
 573         case IPV6_2292HOPOPTS:
 574                 if (optlen < sizeof(int))
 575                         goto e_inval;
 576                 np->rxopt.bits.ohopopts = valbool;
 577                 retv = 0;
 578                 break;
 579
 580         case IPV6_RECVDSTOPTS:
 581                 if (optlen < sizeof(int))
 582                         goto e_inval;
 583                 np->rxopt.bits.dstopts = valbool;
 584                 retv = 0;
 585                 break;
 586
 587         case IPV6_2292DSTOPTS:
 588                 if (optlen < sizeof(int))
 589                         goto e_inval;
 590                 np->rxopt.bits.odstopts = valbool;
 591                 retv = 0;
 592                 break;
 593
 594         case IPV6_TCLASS:
 595                 if (optlen < sizeof(int))
 596                         goto e_inval;
 597                 if (val < -1 || val > 0xff)
 598                         goto e_inval;
 599                 /* RFC 3542, 6.5: default traffic class of 0x0 */
 600                 if (val == -1)
 601                         val = 0;
 602                 if (sk->sk_type == SOCK_STREAM) {
 603                         val &= ~INET_ECN_MASK;
 604                         val |= np->tclass & INET_ECN_MASK;
 605                 }
 606                 if (np->tclass != val) {
 607                         np->tclass = val;
 608                         sk_dst_reset(sk);
 609                 }
 610                 retv = 0;
 611                 break;
 612
 613         case IPV6_RECVTCLASS:
 614                 if (optlen < sizeof(int))
 615                         goto e_inval;
 616                 np->rxopt.bits.rxtclass = valbool;
 617                 retv = 0;
 618                 break;
 619
 620         case IPV6_FLOWINFO:
 621                 if (optlen < sizeof(int))
 622                         goto e_inval;
 623                 np->rxopt.bits.rxflow = valbool;
 624                 retv = 0;
 625                 break;
 626
 627         case IPV6_RECVPATHMTU:
 628                 if (optlen < sizeof(int))
 629                         goto e_inval;
 630                 np->rxopt.bits.rxpmtu = valbool;
 631                 retv = 0;
 632                 break;
 633
 634         case IPV6_TRANSPARENT:
 635                 if (valbool && !ns_capable(net->user_ns, CAP_NET_RAW) &&
 636                     !ns_capable(net->user_ns, CAP_NET_ADMIN)) {
 637                         retv = -EPERM;
 638                         break;
 639                 }
 640                 if (optlen < sizeof(int))
 641                         goto e_inval;
 642                 /* we don't have a separate transparent bit for IPV6 we use the one in the IPv4 socket */
 643                 inet_sk(sk)->transparent = valbool;
 644                 retv = 0;
 645                 break;
 646
 647         case IPV6_FREEBIND:
 648                 if (optlen < sizeof(int))
 649                         goto e_inval;
 650                 /* we also don't have a separate freebind bit for IPV6 */
 651                 inet_sk(sk)->freebind = valbool;
 652                 retv = 0;
 653                 break;
 654
 655         case IPV6_RECVORIGDSTADDR:
 656                 if (optlen < sizeof(int))
 657                         goto e_inval;
 658                 np->rxopt.bits.rxorigdstaddr = valbool;
 659                 retv = 0;
 660                 break;
 661
 662         case IPV6_HOPOPTS:
 663         case IPV6_RTHDRDSTOPTS:
 664         case IPV6_RTHDR:
 665         case IPV6_DSTOPTS:
 666                 retv = ipv6_set_opt_hdr(sk, optname, optval, optlen);
 667                 break;
 668
 669         case IPV6_PKTINFO:
 670         {
 671                 struct in6_pktinfo pkt;
 672
 673                 if (optlen == 0)
 674                         goto e_inval;
 675                 else if (optlen < sizeof(struct in6_pktinfo) ||
 676                          sockptr_is_null(optval))
 677                         goto e_inval;
 678
 679                 if (copy_from_sockptr(&pkt, optval, sizeof(pkt))) {
 680                         retv = -EFAULT;
 681                         break;
 682                 }
 683                 if (!sk_dev_equal_l3scope(sk, pkt.ipi6_ifindex))
 684                         goto e_inval;
 685
 686                 np->sticky_pktinfo.ipi6_ifindex = pkt.ipi6_ifindex;
 687                 np->sticky_pktinfo.ipi6_addr = pkt.ipi6_addr;
 688                 retv = 0;
 689                 break;
 690         }
 691
 692         case IPV6_2292PKTOPTIONS:
 693         {
 694                 struct ipv6_txoptions *opt = NULL;
 695                 struct msghdr msg;
 696                 struct flowi6 fl6;
 697                 struct ipcm6_cookie ipc6;
 698
 699                 memset(&fl6, 0, sizeof(fl6));
 700                 fl6.flowi6_oif = sk->sk_bound_dev_if;
 701                 fl6.flowi6_mark = sk->sk_mark;
 702
 703                 if (optlen == 0)
 704                         goto update;
 705
 706                 /* 1K is probably excessive
 707                  * 1K is surely not enough, 2K per standard header is 16K.
 708                  */
 709                 retv = -EINVAL;
 710                 if (optlen > 64*1024)
 711                         break;
 712
 713                 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
 714                 retv = -ENOBUFS;
 715                 if (!opt)
 716                         break;
 717
 718                 memset(opt, 0, sizeof(*opt));
 719                 refcount_set(&opt->refcnt, 1);
 720                 opt->tot_len = sizeof(*opt) + optlen;
 721                 retv = -EFAULT;
 722                 if (copy_from_sockptr(opt + 1, optval, optlen))
 723                         goto done;
 724
 725                 msg.msg_controllen = optlen;
 726                 msg.msg_control = (void *)(opt+1);
 727                 ipc6.opt = opt;
 728
 729                 retv = ip6_datagram_send_ctl(net, sk, &msg, &fl6, &ipc6);
 730                 if (retv)
 731                         goto done;
 732 update:
 733                 retv = 0;
 734                 opt = ipv6_update_options(sk, opt);
 735 done:
 736                 if (opt) {
 737                         atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
 738                         txopt_put(opt);
 739                 }
 740                 break;
 741         }
 742         case IPV6_UNICAST_HOPS:
 743                 if (optlen < sizeof(int))
 744                         goto e_inval;
 745                 if (val > 255 || val < -1)
 746                         goto e_inval;
 747                 np->hop_limit = val;
 748                 retv = 0;
 749                 break;
 750
 751         case IPV6_MULTICAST_HOPS:
 752                 if (sk->sk_type == SOCK_STREAM)
 753                         break;
 754                 if (optlen < sizeof(int))
 755                         goto e_inval;
 756                 if (val > 255 || val < -1)
 757                         goto e_inval;
 758                 np->mcast_hops = (val == -1 ? IPV6_DEFAULT_MCASTHOPS : val);
 759                 retv = 0;
 760                 break;
 761
 762         case IPV6_MULTICAST_LOOP:
 763                 if (optlen < sizeof(int))
 764                         goto e_inval;
 765                 if (val != valbool)
 766                         goto e_inval;
 767                 np->mc_loop = valbool;
 768                 retv = 0;
 769                 break;
 770
 771         case IPV6_UNICAST_IF:
 772         {
 773                 struct net_device *dev = NULL;
 774                 int ifindex;
 775
 776                 if (optlen != sizeof(int))
 777                         goto e_inval;
 778
 779                 ifindex = (__force int)ntohl((__force __be32)val);
 780                 if (ifindex == 0) {
 781                         np->ucast_oif = 0;
 782                         retv = 0;
 783                         break;
 784                 }
 785
 786                 dev = dev_get_by_index(net, ifindex);
 787                 retv = -EADDRNOTAVAIL;
 788                 if (!dev)
 789                         break;
 790                 dev_put(dev);
 791
 792                 retv = -EINVAL;
 793                 if (sk->sk_bound_dev_if)
 794                         break;
 795
 796                 np->ucast_oif = ifindex;
 797                 retv = 0;
 798                 break;
 799         }
 800
 801         case IPV6_MULTICAST_IF:
 802                 if (sk->sk_type == SOCK_STREAM)
 803                         break;
 804                 if (optlen < sizeof(int))
 805                         goto e_inval;
 806
 807                 if (val) {
 808                         struct net_device *dev;
 809                         int midx;
 810
 811                         rcu_read_lock();
 812
 813                         dev = dev_get_by_index_rcu(net, val);
 814                         if (!dev) {
 815                                 rcu_read_unlock();
 816                                 retv = -ENODEV;
 817                                 break;
 818                         }
 819                         midx = l3mdev_master_ifindex_rcu(dev);
 820
 821                         rcu_read_unlock();
 822
 823                         if (sk->sk_bound_dev_if &&
 824                             sk->sk_bound_dev_if != val &&
 825                             (!midx || midx != sk->sk_bound_dev_if))
 826                                 goto e_inval;
 827                 }
 828                 np->mcast_oif = val;
 829                 retv = 0;
 830                 break;
 831         case IPV6_ADD_MEMBERSHIP:
 832         case IPV6_DROP_MEMBERSHIP:
 833         {
 834                 struct ipv6_mreq mreq;
 835
 836                 if (optlen < sizeof(struct ipv6_mreq))
 837                         goto e_inval;
 838
 839                 retv = -EPROTO;
 840                 if (inet_sk(sk)->is_icsk)
 841                         break;
 842
 843                 retv = -EFAULT;
 844                 if (copy_from_sockptr(&mreq, optval, sizeof(struct ipv6_mreq)))
 845                         break;
 846
 847                 if (optname == IPV6_ADD_MEMBERSHIP)
 848                         retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 849                 else
 850                         retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 851                 break;
 852         }
 853         case IPV6_JOIN_ANYCAST:
 854         case IPV6_LEAVE_ANYCAST:
 855         {
 856                 struct ipv6_mreq mreq;
 857
 858                 if (optlen < sizeof(struct ipv6_mreq))
 859                         goto e_inval;
 860
 861                 retv = -EFAULT;
 862                 if (copy_from_sockptr(&mreq, optval, sizeof(struct ipv6_mreq)))
 863                         break;
 864
 865                 if (optname == IPV6_JOIN_ANYCAST)
 866                         retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
 867                 else
 868                         retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
 869                 break;
 870         }
 871         case IPV6_MULTICAST_ALL:
 872                 if (optlen < sizeof(int))
 873                         goto e_inval;
 874                 np->mc_all = valbool;
 875                 retv = 0;
 876                 break;
 877
 878         case MCAST_JOIN_GROUP:
 879         case MCAST_LEAVE_GROUP:
 880                 if (in_compat_syscall())
 881                         retv = compat_ipv6_mcast_join_leave(sk, optname, optval,
 882                                                             optlen);
 883                 else
 884                         retv = ipv6_mcast_join_leave(sk, optname, optval,
 885                                                      optlen);
 886                 break;
 887         case MCAST_JOIN_SOURCE_GROUP:
 888         case MCAST_LEAVE_SOURCE_GROUP:
 889         case MCAST_BLOCK_SOURCE:
 890         case MCAST_UNBLOCK_SOURCE:
 891                 retv = do_ipv6_mcast_group_source(sk, optname, optval, optlen);
 892                 break;
 893         case MCAST_MSFILTER:
 894                 if (in_compat_syscall())
 895                         retv = compat_ipv6_set_mcast_msfilter(sk, optval,
 896                                                               optlen);
 897                 else
 898                         retv = ipv6_set_mcast_msfilter(sk, optval, optlen);
 899                 break;
 900         case IPV6_ROUTER_ALERT:
 901                 if (optlen < sizeof(int))
 902                         goto e_inval;
 903                 retv = ip6_ra_control(sk, val);
 904                 break;
 905         case IPV6_ROUTER_ALERT_ISOLATE:
 906                 if (optlen < sizeof(int))
 907                         goto e_inval;
 908                 np->rtalert_isolate = valbool;
 909                 retv = 0;
 910                 break;
 911         case IPV6_MTU_DISCOVER:
 912                 if (optlen < sizeof(int))
 913                         goto e_inval;
 914                 if (val < IPV6_PMTUDISC_DONT || val > IPV6_PMTUDISC_OMIT)
 915                         goto e_inval;
 916                 np->pmtudisc = val;
 917                 retv = 0;
 918                 break;
 919         case IPV6_MTU:
 920                 if (optlen < sizeof(int))
 921                         goto e_inval;
 922                 if (val && val < IPV6_MIN_MTU)
 923                         goto e_inval;
 924                 np->frag_size = val;
 925                 retv = 0;
 926                 break;
 927         case IPV6_RECVERR:
 928                 if (optlen < sizeof(int))
 929                         goto e_inval;
 930                 np->recverr = valbool;
 931                 if (!val)
 932                         skb_queue_purge(&sk->sk_error_queue);
 933                 retv = 0;
 934                 break;
 935         case IPV6_FLOWINFO_SEND:
 936                 if (optlen < sizeof(int))
 937                         goto e_inval;
 938                 np->sndflow = valbool;
 939                 retv = 0;
 940                 break;
 941         case IPV6_FLOWLABEL_MGR:
 942                 retv = ipv6_flowlabel_opt(sk, optval, optlen);
 943                 break;
 944         case IPV6_IPSEC_POLICY:
 945         case IPV6_XFRM_POLICY:
 946                 retv = -EPERM;
 947                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 948                         break;
 949                 retv = xfrm_user_policy(sk, optname, optval, optlen);
 950                 break;
 951
 952         case IPV6_ADDR_PREFERENCES:
 953                 if (optlen < sizeof(int))
 954                         goto e_inval;
 955                 retv = __ip6_sock_set_addr_preferences(sk, val);
 956                 break;
 957         case IPV6_MINHOPCOUNT:
 958                 if (optlen < sizeof(int))
 959                         goto e_inval;
 960                 if (val < 0 || val > 255)
 961                         goto e_inval;
 962
 963                 if (val)
 964                         static_branch_enable(&ip6_min_hopcount);
 965
 966                 /* tcp_v6_err() and tcp_v6_rcv() might read min_hopcount
 967                  * while we are changing it.
 968                  */
 969                 WRITE_ONCE(np->min_hopcount, val);
 970                 retv = 0;
 971                 break;
 972         case IPV6_DONTFRAG:
 973                 np->dontfrag = valbool;
 974                 retv = 0;
 975                 break;
 976         case IPV6_AUTOFLOWLABEL:
 977                 np->autoflowlabel = valbool;
 978                 np->autoflowlabel_set = 1;
 979                 retv = 0;
 980                 break;
 981         case IPV6_RECVFRAGSIZE:
 982                 np->rxopt.bits.recvfragsize = valbool;
 983                 retv = 0;
 984                 break;
 985         case IPV6_RECVERR_RFC4884:
 986                 if (optlen < sizeof(int))
 987                         goto e_inval;
 988                 if (val < 0 || val > 1)
 989                         goto e_inval;
 990                 np->recverr_rfc4884 = valbool;
 991                 retv = 0;
 992                 break;
 993         }
 994
 995         release_sock(sk);
 996         if (needs_rtnl)
 997                 rtnl_unlock();
 998
 999         return retv;
1000
1001 e_inval:
1002         release_sock(sk);
1003         if (needs_rtnl)
1004                 rtnl_unlock();
1005         return -EINVAL;
1006 }
1007
1008 int ipv6_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval,
1009                     unsigned int optlen)
1010 {
1011         int err;
1012
1013         if (level == SOL_IP && sk->sk_type != SOCK_RAW)
1014                 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
1015
1016         if (level != SOL_IPV6)
1017                 return -ENOPROTOOPT;
1018
1019         err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
1020 #ifdef CONFIG_NETFILTER
1021         /* we need to exclude all possible ENOPROTOOPTs except default case */
1022         if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
1023                         optname != IPV6_XFRM_POLICY)
1024                 err = nf_setsockopt(sk, PF_INET6, optname, optval, optlen);
1025 #endif
1026         return err;
1027 }
1028 EXPORT_SYMBOL(ipv6_setsockopt);
1029
1030 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
1031                                   int optname, char __user *optval, int len)
1032 {
1033         struct ipv6_opt_hdr *hdr;
1034
1035         if (!opt)
1036                 return 0;
1037
1038         switch (optname) {
1039         case IPV6_HOPOPTS:
1040                 hdr = opt->hopopt;
1041                 break;
1042         case IPV6_RTHDRDSTOPTS:
1043                 hdr = opt->dst0opt;
1044                 break;
1045         case IPV6_RTHDR:
1046                 hdr = (struct ipv6_opt_hdr *)opt->srcrt;
1047                 break;
1048         case IPV6_DSTOPTS:
1049                 hdr = opt->dst1opt;
1050                 break;
1051         default:
1052                 return -EINVAL; /* should not happen */
1053         }
1054
1055         if (!hdr)
1056                 return 0;
1057
1058         len = min_t(unsigned int, len, ipv6_optlen(hdr));
1059         if (copy_to_user(optval, hdr, len))
1060                 return -EFAULT;
1061         return len;
1062 }
1063
1064 static int ipv6_get_msfilter(struct sock *sk, void __user *optval,
1065                 int __user *optlen, int len)
1066 {
1067         const int size0 = offsetof(struct group_filter, gf_slist_flex);
1068         struct group_filter __user *p = optval;
1069         struct group_filter gsf;
1070         int num;
1071         int err;
1072
1073         if (len < size0)
1074                 return -EINVAL;
1075         if (copy_from_user(&gsf, p, size0))
1076                 return -EFAULT;
1077         if (gsf.gf_group.ss_family != AF_INET6)
1078                 return -EADDRNOTAVAIL;
1079         num = gsf.gf_numsrc;
1080         lock_sock(sk);
1081         err = ip6_mc_msfget(sk, &gsf, p->gf_slist_flex);
1082         if (!err) {
1083                 if (num > gsf.gf_numsrc)
1084                         num = gsf.gf_numsrc;
1085                 if (put_user(GROUP_FILTER_SIZE(num), optlen) ||
1086                     copy_to_user(p, &gsf, size0))
1087                         err = -EFAULT;
1088         }
1089         release_sock(sk);
1090         return err;
1091 }
1092
1093 static int compat_ipv6_get_msfilter(struct sock *sk, void __user *optval,
1094                 int __user *optlen)
1095 {
1096         const int size0 = offsetof(struct compat_group_filter, gf_slist_flex);
1097         struct compat_group_filter __user *p = optval;
1098         struct compat_group_filter gf32;
1099         struct group_filter gf;
1100         int len, err;
1101         int num;
1102
1103         if (get_user(len, optlen))
1104                 return -EFAULT;
1105         if (len < size0)
1106                 return -EINVAL;
1107
1108         if (copy_from_user(&gf32, p, size0))
1109                 return -EFAULT;
1110         gf.gf_interface = gf32.gf_interface;
1111         gf.gf_fmode = gf32.gf_fmode;
1112         num = gf.gf_numsrc = gf32.gf_numsrc;
1113         gf.gf_group = gf32.gf_group;
1114
1115         if (gf.gf_group.ss_family != AF_INET6)
1116                 return -EADDRNOTAVAIL;
1117
1118         lock_sock(sk);
1119         err = ip6_mc_msfget(sk, &gf, p->gf_slist_flex);
1120         release_sock(sk);
1121         if (err)
1122                 return err;
1123         if (num > gf.gf_numsrc)
1124                 num = gf.gf_numsrc;
1125         len = GROUP_FILTER_SIZE(num) - (sizeof(gf)-sizeof(gf32));
1126         if (put_user(len, optlen) ||
1127             put_user(gf.gf_fmode, &p->gf_fmode) ||
1128             put_user(gf.gf_numsrc, &p->gf_numsrc))
1129                 return -EFAULT;
1130         return 0;
1131 }
1132
1133 static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
1134                     char __user *optval, int __user *optlen, unsigned int flags)
1135 {
1136         struct ipv6_pinfo *np = inet6_sk(sk);
1137         int len;
1138         int val;
1139
1140         if (ip6_mroute_opt(optname))
1141                 return ip6_mroute_getsockopt(sk, optname, optval, optlen);
1142
1143         if (get_user(len, optlen))
1144                 return -EFAULT;
1145         switch (optname) {
1146         case IPV6_ADDRFORM:
1147                 if (sk->sk_protocol != IPPROTO_UDP &&
1148                     sk->sk_protocol != IPPROTO_UDPLITE &&
1149                     sk->sk_protocol != IPPROTO_TCP)
1150                         return -ENOPROTOOPT;
1151                 if (sk->sk_state != TCP_ESTABLISHED)
1152                         return -ENOTCONN;
1153                 val = sk->sk_family;
1154                 break;
1155         case MCAST_MSFILTER:
1156                 if (in_compat_syscall())
1157                         return compat_ipv6_get_msfilter(sk, optval, optlen);
1158                 return ipv6_get_msfilter(sk, optval, optlen, len);
1159         case IPV6_2292PKTOPTIONS:
1160         {
1161                 struct msghdr msg;
1162                 struct sk_buff *skb;
1163
1164                 if (sk->sk_type != SOCK_STREAM)
1165                         return -ENOPROTOOPT;
1166
1167                 msg.msg_control_user = optval;
1168                 msg.msg_controllen = len;
1169                 msg.msg_flags = flags;
1170                 msg.msg_control_is_user = true;
1171
1172                 lock_sock(sk);
1173                 skb = np->pktoptions;
1174                 if (skb)
1175                         ip6_datagram_recv_ctl(sk, &msg, skb);
1176                 release_sock(sk);
1177                 if (!skb) {
1178                         if (np->rxopt.bits.rxinfo) {
1179                                 struct in6_pktinfo src_info;
1180                                 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
1181                                         np->sticky_pktinfo.ipi6_ifindex;
1182                                 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr : np->sticky_pktinfo.ipi6_addr;
1183                                 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
1184                         }
1185                         if (np->rxopt.bits.rxhlim) {
1186                                 int hlim = np->mcast_hops;
1187                                 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
1188                         }
1189                         if (np->rxopt.bits.rxtclass) {
1190                                 int tclass = (int)ip6_tclass(np->rcv_flowinfo);
1191
1192                                 put_cmsg(&msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
1193                         }
1194                         if (np->rxopt.bits.rxoinfo) {
1195                                 struct in6_pktinfo src_info;
1196                                 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
1197                                         np->sticky_pktinfo.ipi6_ifindex;
1198                                 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr :
1199                                                                      np->sticky_pktinfo.ipi6_addr;
1200                                 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
1201                         }
1202                         if (np->rxopt.bits.rxohlim) {
1203                                 int hlim = np->mcast_hops;
1204                                 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
1205                         }
1206                         if (np->rxopt.bits.rxflow) {
1207                                 __be32 flowinfo = np->rcv_flowinfo;
1208
1209                                 put_cmsg(&msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
1210                         }
1211                 }
1212                 len -= msg.msg_controllen;
1213                 return put_user(len, optlen);
1214         }
1215         case IPV6_MTU:
1216         {
1217                 struct dst_entry *dst;
1218
1219                 val = 0;
1220                 rcu_read_lock();
1221                 dst = __sk_dst_get(sk);
1222                 if (dst)
1223                         val = dst_mtu(dst);
1224                 rcu_read_unlock();
1225                 if (!val)
1226                         return -ENOTCONN;
1227                 break;
1228         }
1229
1230         case IPV6_V6ONLY:
1231                 val = sk->sk_ipv6only;
1232                 break;
1233
1234         case IPV6_RECVPKTINFO:
1235                 val = np->rxopt.bits.rxinfo;
1236                 break;
1237
1238         case IPV6_2292PKTINFO:
1239                 val = np->rxopt.bits.rxoinfo;
1240                 break;
1241
1242         case IPV6_RECVHOPLIMIT:
1243                 val = np->rxopt.bits.rxhlim;
1244                 break;
1245
1246         case IPV6_2292HOPLIMIT:
1247                 val = np->rxopt.bits.rxohlim;
1248                 break;
1249
1250         case IPV6_RECVRTHDR:
1251                 val = np->rxopt.bits.srcrt;
1252                 break;
1253
1254         case IPV6_2292RTHDR:
1255                 val = np->rxopt.bits.osrcrt;
1256                 break;
1257
1258         case IPV6_HOPOPTS:
1259         case IPV6_RTHDRDSTOPTS:
1260         case IPV6_RTHDR:
1261         case IPV6_DSTOPTS:
1262         {
1263                 struct ipv6_txoptions *opt;
1264
1265                 lock_sock(sk);
1266                 opt = rcu_dereference_protected(np->opt,
1267                                                 lockdep_sock_is_held(sk));
1268                 len = ipv6_getsockopt_sticky(sk, opt, optname, optval, len);
1269                 release_sock(sk);
1270                 /* check if ipv6_getsockopt_sticky() returns err code */
1271                 if (len < 0)
1272                         return len;
1273                 return put_user(len, optlen);
1274         }
1275
1276         case IPV6_RECVHOPOPTS:
1277                 val = np->rxopt.bits.hopopts;
1278                 break;
1279
1280         case IPV6_2292HOPOPTS:
1281                 val = np->rxopt.bits.ohopopts;
1282                 break;
1283
1284         case IPV6_RECVDSTOPTS:
1285                 val = np->rxopt.bits.dstopts;
1286                 break;
1287
1288         case IPV6_2292DSTOPTS:
1289                 val = np->rxopt.bits.odstopts;
1290                 break;
1291
1292         case IPV6_TCLASS:
1293                 val = np->tclass;
1294                 break;
1295
1296         case IPV6_RECVTCLASS:
1297                 val = np->rxopt.bits.rxtclass;
1298                 break;
1299
1300         case IPV6_FLOWINFO:
1301                 val = np->rxopt.bits.rxflow;
1302                 break;
1303
1304         case IPV6_RECVPATHMTU:
1305                 val = np->rxopt.bits.rxpmtu;
1306                 break;
1307
1308         case IPV6_PATHMTU:
1309         {
1310                 struct dst_entry *dst;
1311                 struct ip6_mtuinfo mtuinfo;
1312
1313                 if (len < sizeof(mtuinfo))
1314                         return -EINVAL;
1315
1316                 len = sizeof(mtuinfo);
1317                 memset(&mtuinfo, 0, sizeof(mtuinfo));
1318
1319                 rcu_read_lock();
1320                 dst = __sk_dst_get(sk);
1321                 if (dst)
1322                         mtuinfo.ip6m_mtu = dst_mtu(dst);
1323                 rcu_read_unlock();
1324                 if (!mtuinfo.ip6m_mtu)
1325                         return -ENOTCONN;
1326
1327                 if (put_user(len, optlen))
1328                         return -EFAULT;
1329                 if (copy_to_user(optval, &mtuinfo, len))
1330                         return -EFAULT;
1331
1332                 return 0;
1333         }
1334
1335         case IPV6_TRANSPARENT:
1336                 val = inet_sk(sk)->transparent;
1337                 break;
1338
1339         case IPV6_FREEBIND:
1340                 val = inet_sk(sk)->freebind;
1341                 break;
1342
1343         case IPV6_RECVORIGDSTADDR:
1344                 val = np->rxopt.bits.rxorigdstaddr;
1345                 break;
1346
1347         case IPV6_UNICAST_HOPS:
1348         case IPV6_MULTICAST_HOPS:
1349         {
1350                 struct dst_entry *dst;
1351
1352                 if (optname == IPV6_UNICAST_HOPS)
1353                         val = np->hop_limit;
1354                 else
1355                         val = np->mcast_hops;
1356
1357                 if (val < 0) {
1358                         rcu_read_lock();
1359                         dst = __sk_dst_get(sk);
1360                         if (dst)
1361                                 val = ip6_dst_hoplimit(dst);
1362                         rcu_read_unlock();
1363                 }
1364
1365                 if (val < 0)
1366                         val = sock_net(sk)->ipv6.devconf_all->hop_limit;
1367                 break;
1368         }
1369
1370         case IPV6_MULTICAST_LOOP:
1371                 val = np->mc_loop;
1372                 break;
1373
1374         case IPV6_MULTICAST_IF:
1375                 val = np->mcast_oif;
1376                 break;
1377
1378         case IPV6_MULTICAST_ALL:
1379                 val = np->mc_all;
1380                 break;
1381
1382         case IPV6_UNICAST_IF:
1383                 val = (__force int)htonl((__u32) np->ucast_oif);
1384                 break;
1385
1386         case IPV6_MTU_DISCOVER:
1387                 val = np->pmtudisc;
1388                 break;
1389
1390         case IPV6_RECVERR:
1391                 val = np->recverr;
1392                 break;
1393
1394         case IPV6_FLOWINFO_SEND:
1395                 val = np->sndflow;
1396                 break;
1397
1398         case IPV6_FLOWLABEL_MGR:
1399         {
1400                 struct in6_flowlabel_req freq;
1401                 int flags;
1402
1403                 if (len < sizeof(freq))
1404                         return -EINVAL;
1405
1406                 if (copy_from_user(&freq, optval, sizeof(freq)))
1407                         return -EFAULT;
1408
1409                 if (freq.flr_action != IPV6_FL_A_GET)
1410                         return -EINVAL;
1411
1412                 len = sizeof(freq);
1413                 flags = freq.flr_flags;
1414
1415                 memset(&freq, 0, sizeof(freq));
1416
1417                 val = ipv6_flowlabel_opt_get(sk, &freq, flags);
1418                 if (val < 0)
1419                         return val;
1420
1421                 if (put_user(len, optlen))
1422                         return -EFAULT;
1423                 if (copy_to_user(optval, &freq, len))
1424                         return -EFAULT;
1425
1426                 return 0;
1427         }
1428
1429         case IPV6_ADDR_PREFERENCES:
1430                 val = 0;
1431
1432                 if (np->srcprefs & IPV6_PREFER_SRC_TMP)
1433                         val |= IPV6_PREFER_SRC_TMP;
1434                 else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC)
1435                         val |= IPV6_PREFER_SRC_PUBLIC;
1436                 else {
1437                         /* XXX: should we return system default? */
1438                         val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT;
1439                 }
1440
1441                 if (np->srcprefs & IPV6_PREFER_SRC_COA)
1442                         val |= IPV6_PREFER_SRC_COA;
1443                 else
1444                         val |= IPV6_PREFER_SRC_HOME;
1445                 break;
1446
1447         case IPV6_MINHOPCOUNT:
1448                 val = np->min_hopcount;
1449                 break;
1450
1451         case IPV6_DONTFRAG:
1452                 val = np->dontfrag;
1453                 break;
1454
1455         case IPV6_AUTOFLOWLABEL:
1456                 val = ip6_autoflowlabel(sock_net(sk), np);
1457                 break;
1458
1459         case IPV6_RECVFRAGSIZE:
1460                 val = np->rxopt.bits.recvfragsize;
1461                 break;
1462
1463         case IPV6_ROUTER_ALERT_ISOLATE:
1464                 val = np->rtalert_isolate;
1465                 break;
1466
1467         case IPV6_RECVERR_RFC4884:
1468                 val = np->recverr_rfc4884;
1469                 break;
1470
1471         default:
1472                 return -ENOPROTOOPT;
1473         }
1474         len = min_t(unsigned int, sizeof(int), len);
1475         if (put_user(len, optlen))
1476                 return -EFAULT;
1477         if (copy_to_user(optval, &val, len))
1478                 return -EFAULT;
1479         return 0;
1480 }
1481
1482 int ipv6_getsockopt(struct sock *sk, int level, int optname,
1483                     char __user *optval, int __user *optlen)
1484 {
1485         int err;
1486
1487         if (level == SOL_IP && sk->sk_type != SOCK_RAW)
1488                 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1489
1490         if (level != SOL_IPV6)
1491                 return -ENOPROTOOPT;
1492
1493         err = do_ipv6_getsockopt(sk, level, optname, optval, optlen, 0);
1494 #ifdef CONFIG_NETFILTER
1495         /* we need to exclude all possible ENOPROTOOPTs except default case */
1496         if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1497                 int len;
1498
1499                 if (get_user(len, optlen))
1500                         return -EFAULT;
1501
1502                 err = nf_getsockopt(sk, PF_INET6, optname, optval, &len);
1503                 if (err >= 0)
1504                         err = put_user(len, optlen);
1505         }
1506 #endif
1507         return err;
1508 }
1509 EXPORT_SYMBOL(ipv6_getsockopt);