net/ipv4/ip_sockglue.c

   1 /*
   2  * INET         An implementation of the TCP/IP protocol suite for the LINUX
   3  *              operating system.  INET is implemented using the  BSD Socket
   4  *              interface as the means of communication with the user level.
   5  *
   6  *              The IP to API glue.
   7  *
   8  * Authors:     see ip.c
   9  *
  10  * Fixes:
  11  *              Many            :       Split from ip.c , see ip.c for history.
  12  *              Martin Mares    :       TOS setting fixed.
  13  *              Alan Cox        :       Fixed a couple of oopses in Martin's
  14  *                                      TOS tweaks.
  15  *              Mike McLagan    :       Routing by source
  16  */
  17
  18 #include <linux/module.h>
  19 #include <linux/types.h>
  20 #include <linux/mm.h>
  21 #include <linux/skbuff.h>
  22 #include <linux/ip.h>
  23 #include <linux/icmp.h>
  24 #include <linux/inetdevice.h>
  25 #include <linux/netdevice.h>
  26 #include <linux/slab.h>
  27 #include <net/sock.h>
  28 #include <net/ip.h>
  29 #include <net/icmp.h>
  30 #include <net/tcp_states.h>
  31 #include <linux/udp.h>
  32 #include <linux/igmp.h>
  33 #include <linux/netfilter.h>
  34 #include <linux/route.h>
  35 #include <linux/mroute.h>
  36 #include <net/route.h>
  37 #include <net/xfrm.h>
  38 #include <net/compat.h>
  39 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
  40 #include <net/transp_v6.h>
  41 #endif
  42
  43 #include <linux/errqueue.h>
  44 #include <asm/uaccess.h>
  45
  46 #define IP_CMSG_PKTINFO         1
  47 #define IP_CMSG_TTL             2
  48 #define IP_CMSG_TOS             4
  49 #define IP_CMSG_RECVOPTS        8
  50 #define IP_CMSG_RETOPTS         16
  51 #define IP_CMSG_PASSSEC         32
  52 #define IP_CMSG_ORIGDSTADDR     64
  53
  54 /*
  55  *      SOL_IP control messages.
  56  */
  57
  58 static void ip_cmsg_recv_pktinfo(struct msghdr *msg, struct sk_buff *skb)
  59 {
  60         struct in_pktinfo info;
  61         struct rtable *rt = skb_rtable(skb);
  62
  63         info.ipi_addr.s_addr = ip_hdr(skb)->daddr;
  64         if (rt) {
  65                 info.ipi_ifindex = rt->rt_iif;
  66                 info.ipi_spec_dst.s_addr = rt->rt_spec_dst;
  67         } else {
  68                 info.ipi_ifindex = 0;
  69                 info.ipi_spec_dst.s_addr = 0;
  70         }
  71
  72         put_cmsg(msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
  73 }
  74
  75 static void ip_cmsg_recv_ttl(struct msghdr *msg, struct sk_buff *skb)
  76 {
  77         int ttl = ip_hdr(skb)->ttl;
  78         put_cmsg(msg, SOL_IP, IP_TTL, sizeof(int), &ttl);
  79 }
  80
  81 static void ip_cmsg_recv_tos(struct msghdr *msg, struct sk_buff *skb)
  82 {
  83         put_cmsg(msg, SOL_IP, IP_TOS, 1, &ip_hdr(skb)->tos);
  84 }
  85
  86 static void ip_cmsg_recv_opts(struct msghdr *msg, struct sk_buff *skb)
  87 {
  88         if (IPCB(skb)->opt.optlen == 0)
  89                 return;
  90
  91         put_cmsg(msg, SOL_IP, IP_RECVOPTS, IPCB(skb)->opt.optlen,
  92                  ip_hdr(skb) + 1);
  93 }
  94
  95
  96 static void ip_cmsg_recv_retopts(struct msghdr *msg, struct sk_buff *skb)
  97 {
  98         unsigned char optbuf[sizeof(struct ip_options) + 40];
  99         struct ip_options * opt = (struct ip_options *)optbuf;
 100
 101         if (IPCB(skb)->opt.optlen == 0)
 102                 return;
 103
 104         if (ip_options_echo(opt, skb)) {
 105                 msg->msg_flags |= MSG_CTRUNC;
 106                 return;
 107         }
 108         ip_options_undo(opt);
 109
 110         put_cmsg(msg, SOL_IP, IP_RETOPTS, opt->optlen, opt->__data);
 111 }
 112
 113 static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb)
 114 {
 115         char *secdata;
 116         u32 seclen, secid;
 117         int err;
 118
 119         err = security_socket_getpeersec_dgram(NULL, skb, &secid);
 120         if (err)
 121                 return;
 122
 123         err = security_secid_to_secctx(secid, &secdata, &seclen);
 124         if (err)
 125                 return;
 126
 127         put_cmsg(msg, SOL_IP, SCM_SECURITY, seclen, secdata);
 128         security_release_secctx(secdata, seclen);
 129 }
 130
 131 static void ip_cmsg_recv_dstaddr(struct msghdr *msg, struct sk_buff *skb)
 132 {
 133         struct sockaddr_in sin;
 134         struct iphdr *iph = ip_hdr(skb);
 135         __be16 *ports = (__be16 *)skb_transport_header(skb);
 136
 137         if (skb_transport_offset(skb) + 4 > skb->len)
 138                 return;
 139
 140         /* All current transport protocols have the port numbers in the
 141          * first four bytes of the transport header and this function is
 142          * written with this assumption in mind.
 143          */
 144
 145         sin.sin_family = AF_INET;
 146         sin.sin_addr.s_addr = iph->daddr;
 147         sin.sin_port = ports[1];
 148         memset(sin.sin_zero, 0, sizeof(sin.sin_zero));
 149
 150         put_cmsg(msg, SOL_IP, IP_ORIGDSTADDR, sizeof(sin), &sin);
 151 }
 152
 153 void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb)
 154 {
 155         struct inet_sock *inet = inet_sk(skb->sk);
 156         unsigned flags = inet->cmsg_flags;
 157
 158         /* Ordered by supposed usage frequency */
 159         if (flags & 1)
 160                 ip_cmsg_recv_pktinfo(msg, skb);
 161         if ((flags >>= 1) == 0)
 162                 return;
 163
 164         if (flags & 1)
 165                 ip_cmsg_recv_ttl(msg, skb);
 166         if ((flags >>= 1) == 0)
 167                 return;
 168
 169         if (flags & 1)
 170                 ip_cmsg_recv_tos(msg, skb);
 171         if ((flags >>= 1) == 0)
 172                 return;
 173
 174         if (flags & 1)
 175                 ip_cmsg_recv_opts(msg, skb);
 176         if ((flags >>= 1) == 0)
 177                 return;
 178
 179         if (flags & 1)
 180                 ip_cmsg_recv_retopts(msg, skb);
 181         if ((flags >>= 1) == 0)
 182                 return;
 183
 184         if (flags & 1)
 185                 ip_cmsg_recv_security(msg, skb);
 186
 187         if ((flags >>= 1) == 0)
 188                 return;
 189         if (flags & 1)
 190                 ip_cmsg_recv_dstaddr(msg, skb);
 191
 192 }
 193 EXPORT_SYMBOL(ip_cmsg_recv);
 194
 195 int ip_cmsg_send(struct net *net, struct msghdr *msg, struct ipcm_cookie *ipc)
 196 {
 197         int err;
 198         struct cmsghdr *cmsg;
 199
 200         for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) {
 201                 if (!CMSG_OK(msg, cmsg))
 202                         return -EINVAL;
 203                 if (cmsg->cmsg_level != SOL_IP)
 204                         continue;
 205                 switch (cmsg->cmsg_type) {
 206                 case IP_RETOPTS:
 207                         err = cmsg->cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr));
 208                         err = ip_options_get(net, &ipc->opt, CMSG_DATA(cmsg),
 209                                              err < 40 ? err : 40);
 210                         if (err)
 211                                 return err;
 212                         break;
 213                 case IP_PKTINFO:
 214                 {
 215                         struct in_pktinfo *info;
 216                         if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct in_pktinfo)))
 217                                 return -EINVAL;
 218                         info = (struct in_pktinfo *)CMSG_DATA(cmsg);
 219                         ipc->oif = info->ipi_ifindex;
 220                         ipc->addr = info->ipi_spec_dst.s_addr;
 221                         break;
 222                 }
 223                 default:
 224                         return -EINVAL;
 225                 }
 226         }
 227         return 0;
 228 }
 229
 230
 231 /* Special input handler for packets caught by router alert option.
 232    They are selected only by protocol field, and then processed likely
 233    local ones; but only if someone wants them! Otherwise, router
 234    not running rsvpd will kill RSVP.
 235
 236    It is user level problem, what it will make with them.
 237    I have no idea, how it will masquearde or NAT them (it is joke, joke :-)),
 238    but receiver should be enough clever f.e. to forward mtrace requests,
 239    sent to multicast group to reach destination designated router.
 240  */
 241 struct ip_ra_chain *ip_ra_chain;
 242 DEFINE_RWLOCK(ip_ra_lock);
 243
 244 int ip_ra_control(struct sock *sk, unsigned char on,
 245                   void (*destructor)(struct sock *))
 246 {
 247         struct ip_ra_chain *ra, *new_ra, **rap;
 248
 249         if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num == IPPROTO_RAW)
 250                 return -EINVAL;
 251
 252         new_ra = on ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
 253
 254         write_lock_bh(&ip_ra_lock);
 255         for (rap = &ip_ra_chain; (ra = *rap) != NULL; rap = &ra->next) {
 256                 if (ra->sk == sk) {
 257                         if (on) {
 258                                 write_unlock_bh(&ip_ra_lock);
 259                                 kfree(new_ra);
 260                                 return -EADDRINUSE;
 261                         }
 262                         *rap = ra->next;
 263                         write_unlock_bh(&ip_ra_lock);
 264
 265                         if (ra->destructor)
 266                                 ra->destructor(sk);
 267                         sock_put(sk);
 268                         kfree(ra);
 269                         return 0;
 270                 }
 271         }
 272         if (new_ra == NULL) {
 273                 write_unlock_bh(&ip_ra_lock);
 274                 return -ENOBUFS;
 275         }
 276         new_ra->sk = sk;
 277         new_ra->destructor = destructor;
 278
 279         new_ra->next = ra;
 280         *rap = new_ra;
 281         sock_hold(sk);
 282         write_unlock_bh(&ip_ra_lock);
 283
 284         return 0;
 285 }
 286
 287 void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
 288                    __be16 port, u32 info, u8 *payload)
 289 {
 290         struct sock_exterr_skb *serr;
 291
 292         skb = skb_clone(skb, GFP_ATOMIC);
 293         if (!skb)
 294                 return;
 295
 296         serr = SKB_EXT_ERR(skb);
 297         serr->ee.ee_errno = err;
 298         serr->ee.ee_origin = SO_EE_ORIGIN_ICMP;
 299         serr->ee.ee_type = icmp_hdr(skb)->type;
 300         serr->ee.ee_code = icmp_hdr(skb)->code;
 301         serr->ee.ee_pad = 0;
 302         serr->ee.ee_info = info;
 303         serr->ee.ee_data = 0;
 304         serr->addr_offset = (u8 *)&(((struct iphdr *)(icmp_hdr(skb) + 1))->daddr) -
 305                                    skb_network_header(skb);
 306         serr->port = port;
 307
 308         if (skb_pull(skb, payload - skb->data) != NULL) {
 309                 skb_reset_transport_header(skb);
 310                 if (sock_queue_err_skb(sk, skb) == 0)
 311                         return;
 312         }
 313         kfree_skb(skb);
 314 }
 315
 316 void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 port, u32 info)
 317 {
 318         struct inet_sock *inet = inet_sk(sk);
 319         struct sock_exterr_skb *serr;
 320         struct iphdr *iph;
 321         struct sk_buff *skb;
 322
 323         if (!inet->recverr)
 324                 return;
 325
 326         skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC);
 327         if (!skb)
 328                 return;
 329
 330         skb_put(skb, sizeof(struct iphdr));
 331         skb_reset_network_header(skb);
 332         iph = ip_hdr(skb);
 333         iph->daddr = daddr;
 334
 335         serr = SKB_EXT_ERR(skb);
 336         serr->ee.ee_errno = err;
 337         serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
 338         serr->ee.ee_type = 0;
 339         serr->ee.ee_code = 0;
 340         serr->ee.ee_pad = 0;
 341         serr->ee.ee_info = info;
 342         serr->ee.ee_data = 0;
 343         serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb);
 344         serr->port = port;
 345
 346         __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
 347         skb_reset_transport_header(skb);
 348
 349         if (sock_queue_err_skb(sk, skb))
 350                 kfree_skb(skb);
 351 }
 352
 353 /*
 354  *      Handle MSG_ERRQUEUE
 355  */
 356 int ip_recv_error(struct sock *sk, struct msghdr *msg, int len)
 357 {
 358         struct sock_exterr_skb *serr;
 359         struct sk_buff *skb, *skb2;
 360         struct sockaddr_in *sin;
 361         struct {
 362                 struct sock_extended_err ee;
 363                 struct sockaddr_in       offender;
 364         } errhdr;
 365         int err;
 366         int copied;
 367
 368         err = -EAGAIN;
 369         skb = skb_dequeue(&sk->sk_error_queue);
 370         if (skb == NULL)
 371                 goto out;
 372
 373         copied = skb->len;
 374         if (copied > len) {
 375                 msg->msg_flags |= MSG_TRUNC;
 376                 copied = len;
 377         }
 378         err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
 379         if (err)
 380                 goto out_free_skb;
 381
 382         sock_recv_timestamp(msg, sk, skb);
 383
 384         serr = SKB_EXT_ERR(skb);
 385
 386         sin = (struct sockaddr_in *)msg->msg_name;
 387         if (sin) {
 388                 sin->sin_family = AF_INET;
 389                 sin->sin_addr.s_addr = *(__be32 *)(skb_network_header(skb) +
 390                                                    serr->addr_offset);
 391                 sin->sin_port = serr->port;
 392                 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
 393         }
 394
 395         memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
 396         sin = &errhdr.offender;
 397         sin->sin_family = AF_UNSPEC;
 398         if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP) {
 399                 struct inet_sock *inet = inet_sk(sk);
 400
 401                 sin->sin_family = AF_INET;
 402                 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
 403                 sin->sin_port = 0;
 404                 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
 405                 if (inet->cmsg_flags)
 406                         ip_cmsg_recv(msg, skb);
 407         }
 408
 409         put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr);
 410
 411         /* Now we could try to dump offended packet options */
 412
 413         msg->msg_flags |= MSG_ERRQUEUE;
 414         err = copied;
 415
 416         /* Reset and regenerate socket error */
 417         spin_lock_bh(&sk->sk_error_queue.lock);
 418         sk->sk_err = 0;
 419         skb2 = skb_peek(&sk->sk_error_queue);
 420         if (skb2 != NULL) {
 421                 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
 422                 spin_unlock_bh(&sk->sk_error_queue.lock);
 423                 sk->sk_error_report(sk);
 424         } else
 425                 spin_unlock_bh(&sk->sk_error_queue.lock);
 426
 427 out_free_skb:
 428         kfree_skb(skb);
 429 out:
 430         return err;
 431 }
 432
 433
 434 /*
 435  *      Socket option code for IP. This is the end of the line after any
 436  *      TCP,UDP etc options on an IP socket.
 437  */
 438
 439 static int do_ip_setsockopt(struct sock *sk, int level,
 440                             int optname, char __user *optval, unsigned int optlen)
 441 {
 442         struct inet_sock *inet = inet_sk(sk);
 443         int val = 0, err;
 444
 445         if (((1<<optname) & ((1<<IP_PKTINFO) | (1<<IP_RECVTTL) |
 446                              (1<<IP_RECVOPTS) | (1<<IP_RECVTOS) |
 447                              (1<<IP_RETOPTS) | (1<<IP_TOS) |
 448                              (1<<IP_TTL) | (1<<IP_HDRINCL) |
 449                              (1<<IP_MTU_DISCOVER) | (1<<IP_RECVERR) |
 450                              (1<<IP_ROUTER_ALERT) | (1<<IP_FREEBIND) |
 451                              (1<<IP_PASSSEC) | (1<<IP_TRANSPARENT) |
 452                              (1<<IP_MINTTL))) ||
 453             optname == IP_MULTICAST_TTL ||
 454             optname == IP_MULTICAST_ALL ||
 455             optname == IP_MULTICAST_LOOP ||
 456             optname == IP_RECVORIGDSTADDR) {
 457                 if (optlen >= sizeof(int)) {
 458                         if (get_user(val, (int __user *) optval))
 459                                 return -EFAULT;
 460                 } else if (optlen >= sizeof(char)) {
 461                         unsigned char ucval;
 462
 463                         if (get_user(ucval, (unsigned char __user *) optval))
 464                                 return -EFAULT;
 465                         val = (int) ucval;
 466                 }
 467         }
 468
 469         /* If optlen==0, it is equivalent to val == 0 */
 470
 471         if (ip_mroute_opt(optname))
 472                 return ip_mroute_setsockopt(sk, optname, optval, optlen);
 473
 474         err = 0;
 475         lock_sock(sk);
 476
 477         switch (optname) {
 478         case IP_OPTIONS:
 479         {
 480                 struct ip_options *opt = NULL;
 481                 if (optlen > 40)
 482                         goto e_inval;
 483                 err = ip_options_get_from_user(sock_net(sk), &opt,
 484                                                optval, optlen);
 485                 if (err)
 486                         break;
 487                 if (inet->is_icsk) {
 488                         struct inet_connection_sock *icsk = inet_csk(sk);
 489 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 490                         if (sk->sk_family == PF_INET ||
 491                             (!((1 << sk->sk_state) &
 492                                (TCPF_LISTEN | TCPF_CLOSE)) &&
 493                              inet->inet_daddr != LOOPBACK4_IPV6)) {
 494 #endif
 495                                 if (inet->opt)
 496                                         icsk->icsk_ext_hdr_len -= inet->opt->optlen;
 497                                 if (opt)
 498                                         icsk->icsk_ext_hdr_len += opt->optlen;
 499                                 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
 500 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 501                         }
 502 #endif
 503                 }
 504                 opt = xchg(&inet->opt, opt);
 505                 kfree(opt);
 506                 break;
 507         }
 508         case IP_PKTINFO:
 509                 if (val)
 510                         inet->cmsg_flags |= IP_CMSG_PKTINFO;
 511                 else
 512                         inet->cmsg_flags &= ~IP_CMSG_PKTINFO;
 513                 break;
 514         case IP_RECVTTL:
 515                 if (val)
 516                         inet->cmsg_flags |=  IP_CMSG_TTL;
 517                 else
 518                         inet->cmsg_flags &= ~IP_CMSG_TTL;
 519                 break;
 520         case IP_RECVTOS:
 521                 if (val)
 522                         inet->cmsg_flags |=  IP_CMSG_TOS;
 523                 else
 524                         inet->cmsg_flags &= ~IP_CMSG_TOS;
 525                 break;
 526         case IP_RECVOPTS:
 527                 if (val)
 528                         inet->cmsg_flags |=  IP_CMSG_RECVOPTS;
 529                 else
 530                         inet->cmsg_flags &= ~IP_CMSG_RECVOPTS;
 531                 break;
 532         case IP_RETOPTS:
 533                 if (val)
 534                         inet->cmsg_flags |= IP_CMSG_RETOPTS;
 535                 else
 536                         inet->cmsg_flags &= ~IP_CMSG_RETOPTS;
 537                 break;
 538         case IP_PASSSEC:
 539                 if (val)
 540                         inet->cmsg_flags |= IP_CMSG_PASSSEC;
 541                 else
 542                         inet->cmsg_flags &= ~IP_CMSG_PASSSEC;
 543                 break;
 544         case IP_RECVORIGDSTADDR:
 545                 if (val)
 546                         inet->cmsg_flags |= IP_CMSG_ORIGDSTADDR;
 547                 else
 548                         inet->cmsg_flags &= ~IP_CMSG_ORIGDSTADDR;
 549                 break;
 550         case IP_TOS:    /* This sets both TOS and Precedence */
 551                 if (sk->sk_type == SOCK_STREAM) {
 552                         val &= ~3;
 553                         val |= inet->tos & 3;
 554                 }
 555                 if (inet->tos != val) {
 556                         inet->tos = val;
 557                         sk->sk_priority = rt_tos2priority(val);
 558                         sk_dst_reset(sk);
 559                 }
 560                 break;
 561         case IP_TTL:
 562                 if (optlen < 1)
 563                         goto e_inval;
 564                 if (val != -1 && (val < 0 || val > 255))
 565                         goto e_inval;
 566                 inet->uc_ttl = val;
 567                 break;
 568         case IP_HDRINCL:
 569                 if (sk->sk_type != SOCK_RAW) {
 570                         err = -ENOPROTOOPT;
 571                         break;
 572                 }
 573                 inet->hdrincl = val ? 1 : 0;
 574                 break;
 575         case IP_MTU_DISCOVER:
 576                 if (val < IP_PMTUDISC_DONT || val > IP_PMTUDISC_PROBE)
 577                         goto e_inval;
 578                 inet->pmtudisc = val;
 579                 break;
 580         case IP_RECVERR:
 581                 inet->recverr = !!val;
 582                 if (!val)
 583                         skb_queue_purge(&sk->sk_error_queue);
 584                 break;
 585         case IP_MULTICAST_TTL:
 586                 if (sk->sk_type == SOCK_STREAM)
 587                         goto e_inval;
 588                 if (optlen < 1)
 589                         goto e_inval;
 590                 if (val == -1)
 591                         val = 1;
 592                 if (val < 0 || val > 255)
 593                         goto e_inval;
 594                 inet->mc_ttl = val;
 595                 break;
 596         case IP_MULTICAST_LOOP:
 597                 if (optlen < 1)
 598                         goto e_inval;
 599                 inet->mc_loop = !!val;
 600                 break;
 601         case IP_MULTICAST_IF:
 602         {
 603                 struct ip_mreqn mreq;
 604                 struct net_device *dev = NULL;
 605
 606                 if (sk->sk_type == SOCK_STREAM)
 607                         goto e_inval;
 608                 /*
 609                  *      Check the arguments are allowable
 610                  */
 611
 612                 if (optlen < sizeof(struct in_addr))
 613                         goto e_inval;
 614
 615                 err = -EFAULT;
 616                 if (optlen >= sizeof(struct ip_mreqn)) {
 617                         if (copy_from_user(&mreq, optval, sizeof(mreq)))
 618                                 break;
 619                 } else {
 620                         memset(&mreq, 0, sizeof(mreq));
 621                         if (optlen >= sizeof(struct in_addr) &&
 622                             copy_from_user(&mreq.imr_address, optval,
 623                                            sizeof(struct in_addr)))
 624                                 break;
 625                 }
 626
 627                 if (!mreq.imr_ifindex) {
 628                         if (mreq.imr_address.s_addr == htonl(INADDR_ANY)) {
 629                                 inet->mc_index = 0;
 630                                 inet->mc_addr  = 0;
 631                                 err = 0;
 632                                 break;
 633                         }
 634                         dev = ip_dev_find(sock_net(sk), mreq.imr_address.s_addr);
 635                         if (dev)
 636                                 mreq.imr_ifindex = dev->ifindex;
 637                 } else
 638                         dev = dev_get_by_index(sock_net(sk), mreq.imr_ifindex);
 639
 640
 641                 err = -EADDRNOTAVAIL;
 642                 if (!dev)
 643                         break;
 644                 dev_put(dev);
 645
 646                 err = -EINVAL;
 647                 if (sk->sk_bound_dev_if &&
 648                     mreq.imr_ifindex != sk->sk_bound_dev_if)
 649                         break;
 650
 651                 inet->mc_index = mreq.imr_ifindex;
 652                 inet->mc_addr  = mreq.imr_address.s_addr;
 653                 err = 0;
 654                 break;
 655         }
 656
 657         case IP_ADD_MEMBERSHIP:
 658         case IP_DROP_MEMBERSHIP:
 659         {
 660                 struct ip_mreqn mreq;
 661
 662                 err = -EPROTO;
 663                 if (inet_sk(sk)->is_icsk)
 664                         break;
 665
 666                 if (optlen < sizeof(struct ip_mreq))
 667                         goto e_inval;
 668                 err = -EFAULT;
 669                 if (optlen >= sizeof(struct ip_mreqn)) {
 670                         if (copy_from_user(&mreq, optval, sizeof(mreq)))
 671                                 break;
 672                 } else {
 673                         memset(&mreq, 0, sizeof(mreq));
 674                         if (copy_from_user(&mreq, optval, sizeof(struct ip_mreq)))
 675                                 break;
 676                 }
 677
 678                 if (optname == IP_ADD_MEMBERSHIP)
 679                         err = ip_mc_join_group(sk, &mreq);
 680                 else
 681                         err = ip_mc_leave_group(sk, &mreq);
 682                 break;
 683         }
 684         case IP_MSFILTER:
 685         {
 686                 struct ip_msfilter *msf;
 687
 688                 if (optlen < IP_MSFILTER_SIZE(0))
 689                         goto e_inval;
 690                 if (optlen > sysctl_optmem_max) {
 691                         err = -ENOBUFS;
 692                         break;
 693                 }
 694                 msf = kmalloc(optlen, GFP_KERNEL);
 695                 if (!msf) {
 696                         err = -ENOBUFS;
 697                         break;
 698                 }
 699                 err = -EFAULT;
 700                 if (copy_from_user(msf, optval, optlen)) {
 701                         kfree(msf);
 702                         break;
 703                 }
 704                 /* numsrc >= (1G-4) overflow in 32 bits */
 705                 if (msf->imsf_numsrc >= 0x3ffffffcU ||
 706                     msf->imsf_numsrc > sysctl_igmp_max_msf) {
 707                         kfree(msf);
 708                         err = -ENOBUFS;
 709                         break;
 710                 }
 711                 if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) {
 712                         kfree(msf);
 713                         err = -EINVAL;
 714                         break;
 715                 }
 716                 err = ip_mc_msfilter(sk, msf, 0);
 717                 kfree(msf);
 718                 break;
 719         }
 720         case IP_BLOCK_SOURCE:
 721         case IP_UNBLOCK_SOURCE:
 722         case IP_ADD_SOURCE_MEMBERSHIP:
 723         case IP_DROP_SOURCE_MEMBERSHIP:
 724         {
 725                 struct ip_mreq_source mreqs;
 726                 int omode, add;
 727
 728                 if (optlen != sizeof(struct ip_mreq_source))
 729                         goto e_inval;
 730                 if (copy_from_user(&mreqs, optval, sizeof(mreqs))) {
 731                         err = -EFAULT;
 732                         break;
 733                 }
 734                 if (optname == IP_BLOCK_SOURCE) {
 735                         omode = MCAST_EXCLUDE;
 736                         add = 1;
 737                 } else if (optname == IP_UNBLOCK_SOURCE) {
 738                         omode = MCAST_EXCLUDE;
 739                         add = 0;
 740                 } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) {
 741                         struct ip_mreqn mreq;
 742
 743                         mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr;
 744                         mreq.imr_address.s_addr = mreqs.imr_interface;
 745                         mreq.imr_ifindex = 0;
 746                         err = ip_mc_join_group(sk, &mreq);
 747                         if (err && err != -EADDRINUSE)
 748                                 break;
 749                         omode = MCAST_INCLUDE;
 750                         add = 1;
 751                 } else /* IP_DROP_SOURCE_MEMBERSHIP */ {
 752                         omode = MCAST_INCLUDE;
 753                         add = 0;
 754                 }
 755                 err = ip_mc_source(add, omode, sk, &mreqs, 0);
 756                 break;
 757         }
 758         case MCAST_JOIN_GROUP:
 759         case MCAST_LEAVE_GROUP:
 760         {
 761                 struct group_req greq;
 762                 struct sockaddr_in *psin;
 763                 struct ip_mreqn mreq;
 764
 765                 if (optlen < sizeof(struct group_req))
 766                         goto e_inval;
 767                 err = -EFAULT;
 768                 if (copy_from_user(&greq, optval, sizeof(greq)))
 769                         break;
 770                 psin = (struct sockaddr_in *)&greq.gr_group;
 771                 if (psin->sin_family != AF_INET)
 772                         goto e_inval;
 773                 memset(&mreq, 0, sizeof(mreq));
 774                 mreq.imr_multiaddr = psin->sin_addr;
 775                 mreq.imr_ifindex = greq.gr_interface;
 776
 777                 if (optname == MCAST_JOIN_GROUP)
 778                         err = ip_mc_join_group(sk, &mreq);
 779                 else
 780                         err = ip_mc_leave_group(sk, &mreq);
 781                 break;
 782         }
 783         case MCAST_JOIN_SOURCE_GROUP:
 784         case MCAST_LEAVE_SOURCE_GROUP:
 785         case MCAST_BLOCK_SOURCE:
 786         case MCAST_UNBLOCK_SOURCE:
 787         {
 788                 struct group_source_req greqs;
 789                 struct ip_mreq_source mreqs;
 790                 struct sockaddr_in *psin;
 791                 int omode, add;
 792
 793                 if (optlen != sizeof(struct group_source_req))
 794                         goto e_inval;
 795                 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
 796                         err = -EFAULT;
 797                         break;
 798                 }
 799                 if (greqs.gsr_group.ss_family != AF_INET ||
 800                     greqs.gsr_source.ss_family != AF_INET) {
 801                         err = -EADDRNOTAVAIL;
 802                         break;
 803                 }
 804                 psin = (struct sockaddr_in *)&greqs.gsr_group;
 805                 mreqs.imr_multiaddr = psin->sin_addr.s_addr;
 806                 psin = (struct sockaddr_in *)&greqs.gsr_source;
 807                 mreqs.imr_sourceaddr = psin->sin_addr.s_addr;
 808                 mreqs.imr_interface = 0; /* use index for mc_source */
 809
 810                 if (optname == MCAST_BLOCK_SOURCE) {
 811                         omode = MCAST_EXCLUDE;
 812                         add = 1;
 813                 } else if (optname == MCAST_UNBLOCK_SOURCE) {
 814                         omode = MCAST_EXCLUDE;
 815                         add = 0;
 816                 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
 817                         struct ip_mreqn mreq;
 818
 819                         psin = (struct sockaddr_in *)&greqs.gsr_group;
 820                         mreq.imr_multiaddr = psin->sin_addr;
 821                         mreq.imr_address.s_addr = 0;
 822                         mreq.imr_ifindex = greqs.gsr_interface;
 823                         err = ip_mc_join_group(sk, &mreq);
 824                         if (err && err != -EADDRINUSE)
 825                                 break;
 826                         greqs.gsr_interface = mreq.imr_ifindex;
 827                         omode = MCAST_INCLUDE;
 828                         add = 1;
 829                 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
 830                         omode = MCAST_INCLUDE;
 831                         add = 0;
 832                 }
 833                 err = ip_mc_source(add, omode, sk, &mreqs,
 834                                    greqs.gsr_interface);
 835                 break;
 836         }
 837         case MCAST_MSFILTER:
 838         {
 839                 struct sockaddr_in *psin;
 840                 struct ip_msfilter *msf = NULL;
 841                 struct group_filter *gsf = NULL;
 842                 int msize, i, ifindex;
 843
 844                 if (optlen < GROUP_FILTER_SIZE(0))
 845                         goto e_inval;
 846                 if (optlen > sysctl_optmem_max) {
 847                         err = -ENOBUFS;
 848                         break;
 849                 }
 850                 gsf = kmalloc(optlen, GFP_KERNEL);
 851                 if (!gsf) {
 852                         err = -ENOBUFS;
 853                         break;
 854                 }
 855                 err = -EFAULT;
 856                 if (copy_from_user(gsf, optval, optlen))
 857                         goto mc_msf_out;
 858
 859                 /* numsrc >= (4G-140)/128 overflow in 32 bits */
 860                 if (gsf->gf_numsrc >= 0x1ffffff ||
 861                     gsf->gf_numsrc > sysctl_igmp_max_msf) {
 862                         err = -ENOBUFS;
 863                         goto mc_msf_out;
 864                 }
 865                 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
 866                         err = -EINVAL;
 867                         goto mc_msf_out;
 868                 }
 869                 msize = IP_MSFILTER_SIZE(gsf->gf_numsrc);
 870                 msf = kmalloc(msize, GFP_KERNEL);
 871                 if (!msf) {
 872                         err = -ENOBUFS;
 873                         goto mc_msf_out;
 874                 }
 875                 ifindex = gsf->gf_interface;
 876                 psin = (struct sockaddr_in *)&gsf->gf_group;
 877                 if (psin->sin_family != AF_INET) {
 878                         err = -EADDRNOTAVAIL;
 879                         goto mc_msf_out;
 880                 }
 881                 msf->imsf_multiaddr = psin->sin_addr.s_addr;
 882                 msf->imsf_interface = 0;
 883                 msf->imsf_fmode = gsf->gf_fmode;
 884                 msf->imsf_numsrc = gsf->gf_numsrc;
 885                 err = -EADDRNOTAVAIL;
 886                 for (i = 0; i < gsf->gf_numsrc; ++i) {
 887                         psin = (struct sockaddr_in *)&gsf->gf_slist[i];
 888
 889                         if (psin->sin_family != AF_INET)
 890                                 goto mc_msf_out;
 891                         msf->imsf_slist[i] = psin->sin_addr.s_addr;
 892                 }
 893                 kfree(gsf);
 894                 gsf = NULL;
 895
 896                 err = ip_mc_msfilter(sk, msf, ifindex);
 897 mc_msf_out:
 898                 kfree(msf);
 899                 kfree(gsf);
 900                 break;
 901         }
 902         case IP_MULTICAST_ALL:
 903                 if (optlen < 1)
 904                         goto e_inval;
 905                 if (val != 0 && val != 1)
 906                         goto e_inval;
 907                 inet->mc_all = val;
 908                 break;
 909         case IP_ROUTER_ALERT:
 910                 err = ip_ra_control(sk, val ? 1 : 0, NULL);
 911                 break;
 912
 913         case IP_FREEBIND:
 914                 if (optlen < 1)
 915                         goto e_inval;
 916                 inet->freebind = !!val;
 917                 break;
 918
 919         case IP_IPSEC_POLICY:
 920         case IP_XFRM_POLICY:
 921                 err = -EPERM;
 922                 if (!capable(CAP_NET_ADMIN))
 923                         break;
 924                 err = xfrm_user_policy(sk, optname, optval, optlen);
 925                 break;
 926
 927         case IP_TRANSPARENT:
 928                 if (!capable(CAP_NET_ADMIN)) {
 929                         err = -EPERM;
 930                         break;
 931                 }
 932                 if (optlen < 1)
 933                         goto e_inval;
 934                 inet->transparent = !!val;
 935                 break;
 936
 937         case IP_MINTTL:
 938                 if (optlen < 1)
 939                         goto e_inval;
 940                 if (val < 0 || val > 255)
 941                         goto e_inval;
 942                 inet->min_ttl = val;
 943                 break;
 944
 945         default:
 946                 err = -ENOPROTOOPT;
 947                 break;
 948         }
 949         release_sock(sk);
 950         return err;
 951
 952 e_inval:
 953         release_sock(sk);
 954         return -EINVAL;
 955 }
 956
 957 /**
 958  * ip_queue_rcv_skb - Queue an skb into sock receive queue
 959  * @sk: socket
 960  * @skb: buffer
 961  *
 962  * Queues an skb into socket receive queue. If IP_CMSG_PKTINFO option
 963  * is not set, we drop skb dst entry now, while dst cache line is hot.
 964  */
 965 int ip_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
 966 {
 967         if (!(inet_sk(sk)->cmsg_flags & IP_CMSG_PKTINFO))
 968                 skb_dst_drop(skb);
 969         return sock_queue_rcv_skb(sk, skb);
 970 }
 971 EXPORT_SYMBOL(ip_queue_rcv_skb);
 972
 973 int ip_setsockopt(struct sock *sk, int level,
 974                 int optname, char __user *optval, unsigned int optlen)
 975 {
 976         int err;
 977
 978         if (level != SOL_IP)
 979                 return -ENOPROTOOPT;
 980
 981         err = do_ip_setsockopt(sk, level, optname, optval, optlen);
 982 #ifdef CONFIG_NETFILTER
 983         /* we need to exclude all possible ENOPROTOOPTs except default case */
 984         if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
 985                         optname != IP_IPSEC_POLICY &&
 986                         optname != IP_XFRM_POLICY &&
 987                         !ip_mroute_opt(optname)) {
 988                 lock_sock(sk);
 989                 err = nf_setsockopt(sk, PF_INET, optname, optval, optlen);
 990                 release_sock(sk);
 991         }
 992 #endif
 993         return err;
 994 }
 995 EXPORT_SYMBOL(ip_setsockopt);
 996
 997 #ifdef CONFIG_COMPAT
 998 int compat_ip_setsockopt(struct sock *sk, int level, int optname,
 999                          char __user *optval, unsigned int optlen)
1000 {
1001         int err;
1002
1003         if (level != SOL_IP)
1004                 return -ENOPROTOOPT;
1005
1006         if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
1007                 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
1008                         ip_setsockopt);
1009
1010         err = do_ip_setsockopt(sk, level, optname, optval, optlen);
1011 #ifdef CONFIG_NETFILTER
1012         /* we need to exclude all possible ENOPROTOOPTs except default case */
1013         if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
1014                         optname != IP_IPSEC_POLICY &&
1015                         optname != IP_XFRM_POLICY &&
1016                         !ip_mroute_opt(optname)) {
1017                 lock_sock(sk);
1018                 err = compat_nf_setsockopt(sk, PF_INET, optname,
1019                                            optval, optlen);
1020                 release_sock(sk);
1021         }
1022 #endif
1023         return err;
1024 }
1025 EXPORT_SYMBOL(compat_ip_setsockopt);
1026 #endif
1027
1028 /*
1029  *      Get the options. Note for future reference. The GET of IP options gets
1030  *      the _received_ ones. The set sets the _sent_ ones.
1031  */
1032
1033 static int do_ip_getsockopt(struct sock *sk, int level, int optname,
1034                             char __user *optval, int __user *optlen)
1035 {
1036         struct inet_sock *inet = inet_sk(sk);
1037         int val;
1038         int len;
1039
1040         if (level != SOL_IP)
1041                 return -EOPNOTSUPP;
1042
1043         if (ip_mroute_opt(optname))
1044                 return ip_mroute_getsockopt(sk, optname, optval, optlen);
1045
1046         if (get_user(len, optlen))
1047                 return -EFAULT;
1048         if (len < 0)
1049                 return -EINVAL;
1050
1051         lock_sock(sk);
1052
1053         switch (optname) {
1054         case IP_OPTIONS:
1055         {
1056                 unsigned char optbuf[sizeof(struct ip_options)+40];
1057                 struct ip_options * opt = (struct ip_options *)optbuf;
1058                 opt->optlen = 0;
1059                 if (inet->opt)
1060                         memcpy(optbuf, inet->opt,
1061                                sizeof(struct ip_options)+
1062                                inet->opt->optlen);
1063                 release_sock(sk);
1064
1065                 if (opt->optlen == 0)
1066                         return put_user(0, optlen);
1067
1068                 ip_options_undo(opt);
1069
1070                 len = min_t(unsigned int, len, opt->optlen);
1071                 if (put_user(len, optlen))
1072                         return -EFAULT;
1073                 if (copy_to_user(optval, opt->__data, len))
1074                         return -EFAULT;
1075                 return 0;
1076         }
1077         case IP_PKTINFO:
1078                 val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0;
1079                 break;
1080         case IP_RECVTTL:
1081                 val = (inet->cmsg_flags & IP_CMSG_TTL) != 0;
1082                 break;
1083         case IP_RECVTOS:
1084                 val = (inet->cmsg_flags & IP_CMSG_TOS) != 0;
1085                 break;
1086         case IP_RECVOPTS:
1087                 val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0;
1088                 break;
1089         case IP_RETOPTS:
1090                 val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0;
1091                 break;
1092         case IP_PASSSEC:
1093                 val = (inet->cmsg_flags & IP_CMSG_PASSSEC) != 0;
1094                 break;
1095         case IP_RECVORIGDSTADDR:
1096                 val = (inet->cmsg_flags & IP_CMSG_ORIGDSTADDR) != 0;
1097                 break;
1098         case IP_TOS:
1099                 val = inet->tos;
1100                 break;
1101         case IP_TTL:
1102                 val = (inet->uc_ttl == -1 ?
1103                        sysctl_ip_default_ttl :
1104                        inet->uc_ttl);
1105                 break;
1106         case IP_HDRINCL:
1107                 val = inet->hdrincl;
1108                 break;
1109         case IP_MTU_DISCOVER:
1110                 val = inet->pmtudisc;
1111                 break;
1112         case IP_MTU:
1113         {
1114                 struct dst_entry *dst;
1115                 val = 0;
1116                 dst = sk_dst_get(sk);
1117                 if (dst) {
1118                         val = dst_mtu(dst);
1119                         dst_release(dst);
1120                 }
1121                 if (!val) {
1122                         release_sock(sk);
1123                         return -ENOTCONN;
1124                 }
1125                 break;
1126         }
1127         case IP_RECVERR:
1128                 val = inet->recverr;
1129                 break;
1130         case IP_MULTICAST_TTL:
1131                 val = inet->mc_ttl;
1132                 break;
1133         case IP_MULTICAST_LOOP:
1134                 val = inet->mc_loop;
1135                 break;
1136         case IP_MULTICAST_IF:
1137         {
1138                 struct in_addr addr;
1139                 len = min_t(unsigned int, len, sizeof(struct in_addr));
1140                 addr.s_addr = inet->mc_addr;
1141                 release_sock(sk);
1142
1143                 if (put_user(len, optlen))
1144                         return -EFAULT;
1145                 if (copy_to_user(optval, &addr, len))
1146                         return -EFAULT;
1147                 return 0;
1148         }
1149         case IP_MSFILTER:
1150         {
1151                 struct ip_msfilter msf;
1152                 int err;
1153
1154                 if (len < IP_MSFILTER_SIZE(0)) {
1155                         release_sock(sk);
1156                         return -EINVAL;
1157                 }
1158                 if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) {
1159                         release_sock(sk);
1160                         return -EFAULT;
1161                 }
1162                 err = ip_mc_msfget(sk, &msf,
1163                                    (struct ip_msfilter __user *)optval, optlen);
1164                 release_sock(sk);
1165                 return err;
1166         }
1167         case MCAST_MSFILTER:
1168         {
1169                 struct group_filter gsf;
1170                 int err;
1171
1172                 if (len < GROUP_FILTER_SIZE(0)) {
1173                         release_sock(sk);
1174                         return -EINVAL;
1175                 }
1176                 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) {
1177                         release_sock(sk);
1178                         return -EFAULT;
1179                 }
1180                 err = ip_mc_gsfget(sk, &gsf,
1181                                    (struct group_filter __user *)optval,
1182                                    optlen);
1183                 release_sock(sk);
1184                 return err;
1185         }
1186         case IP_MULTICAST_ALL:
1187                 val = inet->mc_all;
1188                 break;
1189         case IP_PKTOPTIONS:
1190         {
1191                 struct msghdr msg;
1192
1193                 release_sock(sk);
1194
1195                 if (sk->sk_type != SOCK_STREAM)
1196                         return -ENOPROTOOPT;
1197
1198                 msg.msg_control = optval;
1199                 msg.msg_controllen = len;
1200                 msg.msg_flags = 0;
1201
1202                 if (inet->cmsg_flags & IP_CMSG_PKTINFO) {
1203                         struct in_pktinfo info;
1204
1205                         info.ipi_addr.s_addr = inet->inet_rcv_saddr;
1206                         info.ipi_spec_dst.s_addr = inet->inet_rcv_saddr;
1207                         info.ipi_ifindex = inet->mc_index;
1208                         put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
1209                 }
1210                 if (inet->cmsg_flags & IP_CMSG_TTL) {
1211                         int hlim = inet->mc_ttl;
1212                         put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim);
1213                 }
1214                 len -= msg.msg_controllen;
1215                 return put_user(len, optlen);
1216         }
1217         case IP_FREEBIND:
1218                 val = inet->freebind;
1219                 break;
1220         case IP_TRANSPARENT:
1221                 val = inet->transparent;
1222                 break;
1223         case IP_MINTTL:
1224                 val = inet->min_ttl;
1225                 break;
1226         default:
1227                 release_sock(sk);
1228                 return -ENOPROTOOPT;
1229         }
1230         release_sock(sk);
1231
1232         if (len < sizeof(int) && len > 0 && val >= 0 && val <= 255) {
1233                 unsigned char ucval = (unsigned char)val;
1234                 len = 1;
1235                 if (put_user(len, optlen))
1236                         return -EFAULT;
1237                 if (copy_to_user(optval, &ucval, 1))
1238                         return -EFAULT;
1239         } else {
1240                 len = min_t(unsigned int, sizeof(int), len);
1241                 if (put_user(len, optlen))
1242                         return -EFAULT;
1243                 if (copy_to_user(optval, &val, len))
1244                         return -EFAULT;
1245         }
1246         return 0;
1247 }
1248
1249 int ip_getsockopt(struct sock *sk, int level,
1250                   int optname, char __user *optval, int __user *optlen)
1251 {
1252         int err;
1253
1254         err = do_ip_getsockopt(sk, level, optname, optval, optlen);
1255 #ifdef CONFIG_NETFILTER
1256         /* we need to exclude all possible ENOPROTOOPTs except default case */
1257         if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS &&
1258                         !ip_mroute_opt(optname)) {
1259                 int len;
1260
1261                 if (get_user(len, optlen))
1262                         return -EFAULT;
1263
1264                 lock_sock(sk);
1265                 err = nf_getsockopt(sk, PF_INET, optname, optval,
1266                                 &len);
1267                 release_sock(sk);
1268                 if (err >= 0)
1269                         err = put_user(len, optlen);
1270                 return err;
1271         }
1272 #endif
1273         return err;
1274 }
1275 EXPORT_SYMBOL(ip_getsockopt);
1276
1277 #ifdef CONFIG_COMPAT
1278 int compat_ip_getsockopt(struct sock *sk, int level, int optname,
1279                          char __user *optval, int __user *optlen)
1280 {
1281         int err;
1282
1283         if (optname == MCAST_MSFILTER)
1284                 return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1285                         ip_getsockopt);
1286
1287         err = do_ip_getsockopt(sk, level, optname, optval, optlen);
1288
1289 #ifdef CONFIG_NETFILTER
1290         /* we need to exclude all possible ENOPROTOOPTs except default case */
1291         if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS &&
1292                         !ip_mroute_opt(optname)) {
1293                 int len;
1294
1295                 if (get_user(len, optlen))
1296                         return -EFAULT;
1297
1298                 lock_sock(sk);
1299                 err = compat_nf_getsockopt(sk, PF_INET, optname, optval, &len);
1300                 release_sock(sk);
1301                 if (err >= 0)
1302                         err = put_user(len, optlen);
1303                 return err;
1304         }
1305 #endif
1306         return err;
1307 }
1308 EXPORT_SYMBOL(compat_ip_getsockopt);
1309 #endif