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 static DEFINE_SPINLOCK(ip_ra_lock);
 243
 244
 245 static void ip_ra_destroy_rcu(struct rcu_head *head)
 246 {
 247         struct ip_ra_chain *ra = container_of(head, struct ip_ra_chain, rcu);
 248
 249         sock_put(ra->saved_sk);
 250         kfree(ra);
 251 }
 252
 253 int ip_ra_control(struct sock *sk, unsigned char on,
 254                   void (*destructor)(struct sock *))
 255 {
 256         struct ip_ra_chain *ra, *new_ra, **rap;
 257
 258         if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num == IPPROTO_RAW)
 259                 return -EINVAL;
 260
 261         new_ra = on ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
 262
 263         spin_lock_bh(&ip_ra_lock);
 264         for (rap = &ip_ra_chain; (ra = *rap) != NULL; rap = &ra->next) {
 265                 if (ra->sk == sk) {
 266                         if (on) {
 267                                 spin_unlock_bh(&ip_ra_lock);
 268                                 kfree(new_ra);
 269                                 return -EADDRINUSE;
 270                         }
 271                         /* dont let ip_call_ra_chain() use sk again */
 272                         ra->sk = NULL;
 273                         rcu_assign_pointer(*rap, ra->next);
 274                         spin_unlock_bh(&ip_ra_lock);
 275
 276                         if (ra->destructor)
 277                                 ra->destructor(sk);
 278                         /*
 279                          * Delay sock_put(sk) and kfree(ra) after one rcu grace
 280                          * period. This guarantee ip_call_ra_chain() dont need
 281                          * to mess with socket refcounts.
 282                          */
 283                         ra->saved_sk = sk;
 284                         call_rcu(&ra->rcu, ip_ra_destroy_rcu);
 285                         return 0;
 286                 }
 287         }
 288         if (new_ra == NULL) {
 289                 spin_unlock_bh(&ip_ra_lock);
 290                 return -ENOBUFS;
 291         }
 292         new_ra->sk = sk;
 293         new_ra->destructor = destructor;
 294
 295         new_ra->next = ra;
 296         rcu_assign_pointer(*rap, new_ra);
 297         sock_hold(sk);
 298         spin_unlock_bh(&ip_ra_lock);
 299
 300         return 0;
 301 }
 302
 303 void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
 304                    __be16 port, u32 info, u8 *payload)
 305 {
 306         struct sock_exterr_skb *serr;
 307
 308         skb = skb_clone(skb, GFP_ATOMIC);
 309         if (!skb)
 310                 return;
 311
 312         serr = SKB_EXT_ERR(skb);
 313         serr->ee.ee_errno = err;
 314         serr->ee.ee_origin = SO_EE_ORIGIN_ICMP;
 315         serr->ee.ee_type = icmp_hdr(skb)->type;
 316         serr->ee.ee_code = icmp_hdr(skb)->code;
 317         serr->ee.ee_pad = 0;
 318         serr->ee.ee_info = info;
 319         serr->ee.ee_data = 0;
 320         serr->addr_offset = (u8 *)&(((struct iphdr *)(icmp_hdr(skb) + 1))->daddr) -
 321                                    skb_network_header(skb);
 322         serr->port = port;
 323
 324         if (skb_pull(skb, payload - skb->data) != NULL) {
 325                 skb_reset_transport_header(skb);
 326                 if (sock_queue_err_skb(sk, skb) == 0)
 327                         return;
 328         }
 329         kfree_skb(skb);
 330 }
 331
 332 void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 port, u32 info)
 333 {
 334         struct inet_sock *inet = inet_sk(sk);
 335         struct sock_exterr_skb *serr;
 336         struct iphdr *iph;
 337         struct sk_buff *skb;
 338
 339         if (!inet->recverr)
 340                 return;
 341
 342         skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC);
 343         if (!skb)
 344                 return;
 345
 346         skb_put(skb, sizeof(struct iphdr));
 347         skb_reset_network_header(skb);
 348         iph = ip_hdr(skb);
 349         iph->daddr = daddr;
 350
 351         serr = SKB_EXT_ERR(skb);
 352         serr->ee.ee_errno = err;
 353         serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
 354         serr->ee.ee_type = 0;
 355         serr->ee.ee_code = 0;
 356         serr->ee.ee_pad = 0;
 357         serr->ee.ee_info = info;
 358         serr->ee.ee_data = 0;
 359         serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb);
 360         serr->port = port;
 361
 362         __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
 363         skb_reset_transport_header(skb);
 364
 365         if (sock_queue_err_skb(sk, skb))
 366                 kfree_skb(skb);
 367 }
 368
 369 /*
 370  *      Handle MSG_ERRQUEUE
 371  */
 372 int ip_recv_error(struct sock *sk, struct msghdr *msg, int len)
 373 {
 374         struct sock_exterr_skb *serr;
 375         struct sk_buff *skb, *skb2;
 376         struct sockaddr_in *sin;
 377         struct {
 378                 struct sock_extended_err ee;
 379                 struct sockaddr_in       offender;
 380         } errhdr;
 381         int err;
 382         int copied;
 383
 384         err = -EAGAIN;
 385         skb = skb_dequeue(&sk->sk_error_queue);
 386         if (skb == NULL)
 387                 goto out;
 388
 389         copied = skb->len;
 390         if (copied > len) {
 391                 msg->msg_flags |= MSG_TRUNC;
 392                 copied = len;
 393         }
 394         err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
 395         if (err)
 396                 goto out_free_skb;
 397
 398         sock_recv_timestamp(msg, sk, skb);
 399
 400         serr = SKB_EXT_ERR(skb);
 401
 402         sin = (struct sockaddr_in *)msg->msg_name;
 403         if (sin) {
 404                 sin->sin_family = AF_INET;
 405                 sin->sin_addr.s_addr = *(__be32 *)(skb_network_header(skb) +
 406                                                    serr->addr_offset);
 407                 sin->sin_port = serr->port;
 408                 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
 409         }
 410
 411         memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
 412         sin = &errhdr.offender;
 413         sin->sin_family = AF_UNSPEC;
 414         if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP) {
 415                 struct inet_sock *inet = inet_sk(sk);
 416
 417                 sin->sin_family = AF_INET;
 418                 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
 419                 sin->sin_port = 0;
 420                 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
 421                 if (inet->cmsg_flags)
 422                         ip_cmsg_recv(msg, skb);
 423         }
 424
 425         put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr);
 426
 427         /* Now we could try to dump offended packet options */
 428
 429         msg->msg_flags |= MSG_ERRQUEUE;
 430         err = copied;
 431
 432         /* Reset and regenerate socket error */
 433         spin_lock_bh(&sk->sk_error_queue.lock);
 434         sk->sk_err = 0;
 435         skb2 = skb_peek(&sk->sk_error_queue);
 436         if (skb2 != NULL) {
 437                 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
 438                 spin_unlock_bh(&sk->sk_error_queue.lock);
 439                 sk->sk_error_report(sk);
 440         } else
 441                 spin_unlock_bh(&sk->sk_error_queue.lock);
 442
 443 out_free_skb:
 444         kfree_skb(skb);
 445 out:
 446         return err;
 447 }
 448
 449
 450 /*
 451  *      Socket option code for IP. This is the end of the line after any
 452  *      TCP,UDP etc options on an IP socket.
 453  */
 454
 455 static int do_ip_setsockopt(struct sock *sk, int level,
 456                             int optname, char __user *optval, unsigned int optlen)
 457 {
 458         struct inet_sock *inet = inet_sk(sk);
 459         int val = 0, err;
 460
 461         if (((1<<optname) & ((1<<IP_PKTINFO) | (1<<IP_RECVTTL) |
 462                              (1<<IP_RECVOPTS) | (1<<IP_RECVTOS) |
 463                              (1<<IP_RETOPTS) | (1<<IP_TOS) |
 464                              (1<<IP_TTL) | (1<<IP_HDRINCL) |
 465                              (1<<IP_MTU_DISCOVER) | (1<<IP_RECVERR) |
 466                              (1<<IP_ROUTER_ALERT) | (1<<IP_FREEBIND) |
 467                              (1<<IP_PASSSEC) | (1<<IP_TRANSPARENT) |
 468                              (1<<IP_MINTTL) | (1<<IP_NODEFRAG))) ||
 469             optname == IP_MULTICAST_TTL ||
 470             optname == IP_MULTICAST_ALL ||
 471             optname == IP_MULTICAST_LOOP ||
 472             optname == IP_RECVORIGDSTADDR) {
 473                 if (optlen >= sizeof(int)) {
 474                         if (get_user(val, (int __user *) optval))
 475                                 return -EFAULT;
 476                 } else if (optlen >= sizeof(char)) {
 477                         unsigned char ucval;
 478
 479                         if (get_user(ucval, (unsigned char __user *) optval))
 480                                 return -EFAULT;
 481                         val = (int) ucval;
 482                 }
 483         }
 484
 485         /* If optlen==0, it is equivalent to val == 0 */
 486
 487         if (ip_mroute_opt(optname))
 488                 return ip_mroute_setsockopt(sk, optname, optval, optlen);
 489
 490         err = 0;
 491         lock_sock(sk);
 492
 493         switch (optname) {
 494         case IP_OPTIONS:
 495         {
 496                 struct ip_options *opt = NULL;
 497                 if (optlen > 40)
 498                         goto e_inval;
 499                 err = ip_options_get_from_user(sock_net(sk), &opt,
 500                                                optval, optlen);
 501                 if (err)
 502                         break;
 503                 if (inet->is_icsk) {
 504                         struct inet_connection_sock *icsk = inet_csk(sk);
 505 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 506                         if (sk->sk_family == PF_INET ||
 507                             (!((1 << sk->sk_state) &
 508                                (TCPF_LISTEN | TCPF_CLOSE)) &&
 509                              inet->inet_daddr != LOOPBACK4_IPV6)) {
 510 #endif
 511                                 if (inet->opt)
 512                                         icsk->icsk_ext_hdr_len -= inet->opt->optlen;
 513                                 if (opt)
 514                                         icsk->icsk_ext_hdr_len += opt->optlen;
 515                                 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
 516 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 517                         }
 518 #endif
 519                 }
 520                 opt = xchg(&inet->opt, opt);
 521                 kfree(opt);
 522                 break;
 523         }
 524         case IP_PKTINFO:
 525                 if (val)
 526                         inet->cmsg_flags |= IP_CMSG_PKTINFO;
 527                 else
 528                         inet->cmsg_flags &= ~IP_CMSG_PKTINFO;
 529                 break;
 530         case IP_RECVTTL:
 531                 if (val)
 532                         inet->cmsg_flags |=  IP_CMSG_TTL;
 533                 else
 534                         inet->cmsg_flags &= ~IP_CMSG_TTL;
 535                 break;
 536         case IP_RECVTOS:
 537                 if (val)
 538                         inet->cmsg_flags |=  IP_CMSG_TOS;
 539                 else
 540                         inet->cmsg_flags &= ~IP_CMSG_TOS;
 541                 break;
 542         case IP_RECVOPTS:
 543                 if (val)
 544                         inet->cmsg_flags |=  IP_CMSG_RECVOPTS;
 545                 else
 546                         inet->cmsg_flags &= ~IP_CMSG_RECVOPTS;
 547                 break;
 548         case IP_RETOPTS:
 549                 if (val)
 550                         inet->cmsg_flags |= IP_CMSG_RETOPTS;
 551                 else
 552                         inet->cmsg_flags &= ~IP_CMSG_RETOPTS;
 553                 break;
 554         case IP_PASSSEC:
 555                 if (val)
 556                         inet->cmsg_flags |= IP_CMSG_PASSSEC;
 557                 else
 558                         inet->cmsg_flags &= ~IP_CMSG_PASSSEC;
 559                 break;
 560         case IP_RECVORIGDSTADDR:
 561                 if (val)
 562                         inet->cmsg_flags |= IP_CMSG_ORIGDSTADDR;
 563                 else
 564                         inet->cmsg_flags &= ~IP_CMSG_ORIGDSTADDR;
 565                 break;
 566         case IP_TOS:    /* This sets both TOS and Precedence */
 567                 if (sk->sk_type == SOCK_STREAM) {
 568                         val &= ~3;
 569                         val |= inet->tos & 3;
 570                 }
 571                 if (inet->tos != val) {
 572                         inet->tos = val;
 573                         sk->sk_priority = rt_tos2priority(val);
 574                         sk_dst_reset(sk);
 575                 }
 576                 break;
 577         case IP_TTL:
 578                 if (optlen < 1)
 579                         goto e_inval;
 580                 if (val != -1 && (val < 0 || val > 255))
 581                         goto e_inval;
 582                 inet->uc_ttl = val;
 583                 break;
 584         case IP_HDRINCL:
 585                 if (sk->sk_type != SOCK_RAW) {
 586                         err = -ENOPROTOOPT;
 587                         break;
 588                 }
 589                 inet->hdrincl = val ? 1 : 0;
 590                 break;
 591         case IP_NODEFRAG:
 592                 if (sk->sk_type != SOCK_RAW) {
 593                         err = -ENOPROTOOPT;
 594                         break;
 595                 }
 596                 inet->nodefrag = val ? 1 : 0;
 597                 break;
 598         case IP_MTU_DISCOVER:
 599                 if (val < IP_PMTUDISC_DONT || val > IP_PMTUDISC_PROBE)
 600                         goto e_inval;
 601                 inet->pmtudisc = val;
 602                 break;
 603         case IP_RECVERR:
 604                 inet->recverr = !!val;
 605                 if (!val)
 606                         skb_queue_purge(&sk->sk_error_queue);
 607                 break;
 608         case IP_MULTICAST_TTL:
 609                 if (sk->sk_type == SOCK_STREAM)
 610                         goto e_inval;
 611                 if (optlen < 1)
 612                         goto e_inval;
 613                 if (val == -1)
 614                         val = 1;
 615                 if (val < 0 || val > 255)
 616                         goto e_inval;
 617                 inet->mc_ttl = val;
 618                 break;
 619         case IP_MULTICAST_LOOP:
 620                 if (optlen < 1)
 621                         goto e_inval;
 622                 inet->mc_loop = !!val;
 623                 break;
 624         case IP_MULTICAST_IF:
 625         {
 626                 struct ip_mreqn mreq;
 627                 struct net_device *dev = NULL;
 628
 629                 if (sk->sk_type == SOCK_STREAM)
 630                         goto e_inval;
 631                 /*
 632                  *      Check the arguments are allowable
 633                  */
 634
 635                 if (optlen < sizeof(struct in_addr))
 636                         goto e_inval;
 637
 638                 err = -EFAULT;
 639                 if (optlen >= sizeof(struct ip_mreqn)) {
 640                         if (copy_from_user(&mreq, optval, sizeof(mreq)))
 641                                 break;
 642                 } else {
 643                         memset(&mreq, 0, sizeof(mreq));
 644                         if (optlen >= sizeof(struct in_addr) &&
 645                             copy_from_user(&mreq.imr_address, optval,
 646                                            sizeof(struct in_addr)))
 647                                 break;
 648                 }
 649
 650                 if (!mreq.imr_ifindex) {
 651                         if (mreq.imr_address.s_addr == htonl(INADDR_ANY)) {
 652                                 inet->mc_index = 0;
 653                                 inet->mc_addr  = 0;
 654                                 err = 0;
 655                                 break;
 656                         }
 657                         dev = ip_dev_find(sock_net(sk), mreq.imr_address.s_addr);
 658                         if (dev)
 659                                 mreq.imr_ifindex = dev->ifindex;
 660                 } else
 661                         dev = dev_get_by_index(sock_net(sk), mreq.imr_ifindex);
 662
 663
 664                 err = -EADDRNOTAVAIL;
 665                 if (!dev)
 666                         break;
 667                 dev_put(dev);
 668
 669                 err = -EINVAL;
 670                 if (sk->sk_bound_dev_if &&
 671                     mreq.imr_ifindex != sk->sk_bound_dev_if)
 672                         break;
 673
 674                 inet->mc_index = mreq.imr_ifindex;
 675                 inet->mc_addr  = mreq.imr_address.s_addr;
 676                 err = 0;
 677                 break;
 678         }
 679
 680         case IP_ADD_MEMBERSHIP:
 681         case IP_DROP_MEMBERSHIP:
 682         {
 683                 struct ip_mreqn mreq;
 684
 685                 err = -EPROTO;
 686                 if (inet_sk(sk)->is_icsk)
 687                         break;
 688
 689                 if (optlen < sizeof(struct ip_mreq))
 690                         goto e_inval;
 691                 err = -EFAULT;
 692                 if (optlen >= sizeof(struct ip_mreqn)) {
 693                         if (copy_from_user(&mreq, optval, sizeof(mreq)))
 694                                 break;
 695                 } else {
 696                         memset(&mreq, 0, sizeof(mreq));
 697                         if (copy_from_user(&mreq, optval, sizeof(struct ip_mreq)))
 698                                 break;
 699                 }
 700
 701                 if (optname == IP_ADD_MEMBERSHIP)
 702                         err = ip_mc_join_group(sk, &mreq);
 703                 else
 704                         err = ip_mc_leave_group(sk, &mreq);
 705                 break;
 706         }
 707         case IP_MSFILTER:
 708         {
 709                 struct ip_msfilter *msf;
 710
 711                 if (optlen < IP_MSFILTER_SIZE(0))
 712                         goto e_inval;
 713                 if (optlen > sysctl_optmem_max) {
 714                         err = -ENOBUFS;
 715                         break;
 716                 }
 717                 msf = kmalloc(optlen, GFP_KERNEL);
 718                 if (!msf) {
 719                         err = -ENOBUFS;
 720                         break;
 721                 }
 722                 err = -EFAULT;
 723                 if (copy_from_user(msf, optval, optlen)) {
 724                         kfree(msf);
 725                         break;
 726                 }
 727                 /* numsrc >= (1G-4) overflow in 32 bits */
 728                 if (msf->imsf_numsrc >= 0x3ffffffcU ||
 729                     msf->imsf_numsrc > sysctl_igmp_max_msf) {
 730                         kfree(msf);
 731                         err = -ENOBUFS;
 732                         break;
 733                 }
 734                 if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) {
 735                         kfree(msf);
 736                         err = -EINVAL;
 737                         break;
 738                 }
 739                 err = ip_mc_msfilter(sk, msf, 0);
 740                 kfree(msf);
 741                 break;
 742         }
 743         case IP_BLOCK_SOURCE:
 744         case IP_UNBLOCK_SOURCE:
 745         case IP_ADD_SOURCE_MEMBERSHIP:
 746         case IP_DROP_SOURCE_MEMBERSHIP:
 747         {
 748                 struct ip_mreq_source mreqs;
 749                 int omode, add;
 750
 751                 if (optlen != sizeof(struct ip_mreq_source))
 752                         goto e_inval;
 753                 if (copy_from_user(&mreqs, optval, sizeof(mreqs))) {
 754                         err = -EFAULT;
 755                         break;
 756                 }
 757                 if (optname == IP_BLOCK_SOURCE) {
 758                         omode = MCAST_EXCLUDE;
 759                         add = 1;
 760                 } else if (optname == IP_UNBLOCK_SOURCE) {
 761                         omode = MCAST_EXCLUDE;
 762                         add = 0;
 763                 } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) {
 764                         struct ip_mreqn mreq;
 765
 766                         mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr;
 767                         mreq.imr_address.s_addr = mreqs.imr_interface;
 768                         mreq.imr_ifindex = 0;
 769                         err = ip_mc_join_group(sk, &mreq);
 770                         if (err && err != -EADDRINUSE)
 771                                 break;
 772                         omode = MCAST_INCLUDE;
 773                         add = 1;
 774                 } else /* IP_DROP_SOURCE_MEMBERSHIP */ {
 775                         omode = MCAST_INCLUDE;
 776                         add = 0;
 777                 }
 778                 err = ip_mc_source(add, omode, sk, &mreqs, 0);
 779                 break;
 780         }
 781         case MCAST_JOIN_GROUP:
 782         case MCAST_LEAVE_GROUP:
 783         {
 784                 struct group_req greq;
 785                 struct sockaddr_in *psin;
 786                 struct ip_mreqn mreq;
 787
 788                 if (optlen < sizeof(struct group_req))
 789                         goto e_inval;
 790                 err = -EFAULT;
 791                 if (copy_from_user(&greq, optval, sizeof(greq)))
 792                         break;
 793                 psin = (struct sockaddr_in *)&greq.gr_group;
 794                 if (psin->sin_family != AF_INET)
 795                         goto e_inval;
 796                 memset(&mreq, 0, sizeof(mreq));
 797                 mreq.imr_multiaddr = psin->sin_addr;
 798                 mreq.imr_ifindex = greq.gr_interface;
 799
 800                 if (optname == MCAST_JOIN_GROUP)
 801                         err = ip_mc_join_group(sk, &mreq);
 802                 else
 803                         err = ip_mc_leave_group(sk, &mreq);
 804                 break;
 805         }
 806         case MCAST_JOIN_SOURCE_GROUP:
 807         case MCAST_LEAVE_SOURCE_GROUP:
 808         case MCAST_BLOCK_SOURCE:
 809         case MCAST_UNBLOCK_SOURCE:
 810         {
 811                 struct group_source_req greqs;
 812                 struct ip_mreq_source mreqs;
 813                 struct sockaddr_in *psin;
 814                 int omode, add;
 815
 816                 if (optlen != sizeof(struct group_source_req))
 817                         goto e_inval;
 818                 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
 819                         err = -EFAULT;
 820                         break;
 821                 }
 822                 if (greqs.gsr_group.ss_family != AF_INET ||
 823                     greqs.gsr_source.ss_family != AF_INET) {
 824                         err = -EADDRNOTAVAIL;
 825                         break;
 826                 }
 827                 psin = (struct sockaddr_in *)&greqs.gsr_group;
 828                 mreqs.imr_multiaddr = psin->sin_addr.s_addr;
 829                 psin = (struct sockaddr_in *)&greqs.gsr_source;
 830                 mreqs.imr_sourceaddr = psin->sin_addr.s_addr;
 831                 mreqs.imr_interface = 0; /* use index for mc_source */
 832
 833                 if (optname == MCAST_BLOCK_SOURCE) {
 834                         omode = MCAST_EXCLUDE;
 835                         add = 1;
 836                 } else if (optname == MCAST_UNBLOCK_SOURCE) {
 837                         omode = MCAST_EXCLUDE;
 838                         add = 0;
 839                 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
 840                         struct ip_mreqn mreq;
 841
 842                         psin = (struct sockaddr_in *)&greqs.gsr_group;
 843                         mreq.imr_multiaddr = psin->sin_addr;
 844                         mreq.imr_address.s_addr = 0;
 845                         mreq.imr_ifindex = greqs.gsr_interface;
 846                         err = ip_mc_join_group(sk, &mreq);
 847                         if (err && err != -EADDRINUSE)
 848                                 break;
 849                         greqs.gsr_interface = mreq.imr_ifindex;
 850                         omode = MCAST_INCLUDE;
 851                         add = 1;
 852                 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
 853                         omode = MCAST_INCLUDE;
 854                         add = 0;
 855                 }
 856                 err = ip_mc_source(add, omode, sk, &mreqs,
 857                                    greqs.gsr_interface);
 858                 break;
 859         }
 860         case MCAST_MSFILTER:
 861         {
 862                 struct sockaddr_in *psin;
 863                 struct ip_msfilter *msf = NULL;
 864                 struct group_filter *gsf = NULL;
 865                 int msize, i, ifindex;
 866
 867                 if (optlen < GROUP_FILTER_SIZE(0))
 868                         goto e_inval;
 869                 if (optlen > sysctl_optmem_max) {
 870                         err = -ENOBUFS;
 871                         break;
 872                 }
 873                 gsf = kmalloc(optlen, GFP_KERNEL);
 874                 if (!gsf) {
 875                         err = -ENOBUFS;
 876                         break;
 877                 }
 878                 err = -EFAULT;
 879                 if (copy_from_user(gsf, optval, optlen))
 880                         goto mc_msf_out;
 881
 882                 /* numsrc >= (4G-140)/128 overflow in 32 bits */
 883                 if (gsf->gf_numsrc >= 0x1ffffff ||
 884                     gsf->gf_numsrc > sysctl_igmp_max_msf) {
 885                         err = -ENOBUFS;
 886                         goto mc_msf_out;
 887                 }
 888                 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
 889                         err = -EINVAL;
 890                         goto mc_msf_out;
 891                 }
 892                 msize = IP_MSFILTER_SIZE(gsf->gf_numsrc);
 893                 msf = kmalloc(msize, GFP_KERNEL);
 894                 if (!msf) {
 895                         err = -ENOBUFS;
 896                         goto mc_msf_out;
 897                 }
 898                 ifindex = gsf->gf_interface;
 899                 psin = (struct sockaddr_in *)&gsf->gf_group;
 900                 if (psin->sin_family != AF_INET) {
 901                         err = -EADDRNOTAVAIL;
 902                         goto mc_msf_out;
 903                 }
 904                 msf->imsf_multiaddr = psin->sin_addr.s_addr;
 905                 msf->imsf_interface = 0;
 906                 msf->imsf_fmode = gsf->gf_fmode;
 907                 msf->imsf_numsrc = gsf->gf_numsrc;
 908                 err = -EADDRNOTAVAIL;
 909                 for (i = 0; i < gsf->gf_numsrc; ++i) {
 910                         psin = (struct sockaddr_in *)&gsf->gf_slist[i];
 911
 912                         if (psin->sin_family != AF_INET)
 913                                 goto mc_msf_out;
 914                         msf->imsf_slist[i] = psin->sin_addr.s_addr;
 915                 }
 916                 kfree(gsf);
 917                 gsf = NULL;
 918
 919                 err = ip_mc_msfilter(sk, msf, ifindex);
 920 mc_msf_out:
 921                 kfree(msf);
 922                 kfree(gsf);
 923                 break;
 924         }
 925         case IP_MULTICAST_ALL:
 926                 if (optlen < 1)
 927                         goto e_inval;
 928                 if (val != 0 && val != 1)
 929                         goto e_inval;
 930                 inet->mc_all = val;
 931                 break;
 932         case IP_ROUTER_ALERT:
 933                 err = ip_ra_control(sk, val ? 1 : 0, NULL);
 934                 break;
 935
 936         case IP_FREEBIND:
 937                 if (optlen < 1)
 938                         goto e_inval;
 939                 inet->freebind = !!val;
 940                 break;
 941
 942         case IP_IPSEC_POLICY:
 943         case IP_XFRM_POLICY:
 944                 err = -EPERM;
 945                 if (!capable(CAP_NET_ADMIN))
 946                         break;
 947                 err = xfrm_user_policy(sk, optname, optval, optlen);
 948                 break;
 949
 950         case IP_TRANSPARENT:
 951                 if (!capable(CAP_NET_ADMIN)) {
 952                         err = -EPERM;
 953                         break;
 954                 }
 955                 if (optlen < 1)
 956                         goto e_inval;
 957                 inet->transparent = !!val;
 958                 break;
 959
 960         case IP_MINTTL:
 961                 if (optlen < 1)
 962                         goto e_inval;
 963                 if (val < 0 || val > 255)
 964                         goto e_inval;
 965                 inet->min_ttl = val;
 966                 break;
 967
 968         default:
 969                 err = -ENOPROTOOPT;
 970                 break;
 971         }
 972         release_sock(sk);
 973         return err;
 974
 975 e_inval:
 976         release_sock(sk);
 977         return -EINVAL;
 978 }
 979
 980 /**
 981  * ip_queue_rcv_skb - Queue an skb into sock receive queue
 982  * @sk: socket
 983  * @skb: buffer
 984  *
 985  * Queues an skb into socket receive queue. If IP_CMSG_PKTINFO option
 986  * is not set, we drop skb dst entry now, while dst cache line is hot.
 987  */
 988 int ip_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
 989 {
 990         if (!(inet_sk(sk)->cmsg_flags & IP_CMSG_PKTINFO))
 991                 skb_dst_drop(skb);
 992         return sock_queue_rcv_skb(sk, skb);
 993 }
 994 EXPORT_SYMBOL(ip_queue_rcv_skb);
 995
 996 int ip_setsockopt(struct sock *sk, int level,
 997                 int optname, char __user *optval, unsigned int optlen)
 998 {
 999         int err;
1000
1001         if (level != SOL_IP)
1002                 return -ENOPROTOOPT;
1003
1004         err = do_ip_setsockopt(sk, level, optname, optval, optlen);
1005 #ifdef CONFIG_NETFILTER
1006         /* we need to exclude all possible ENOPROTOOPTs except default case */
1007         if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
1008                         optname != IP_IPSEC_POLICY &&
1009                         optname != IP_XFRM_POLICY &&
1010                         !ip_mroute_opt(optname)) {
1011                 lock_sock(sk);
1012                 err = nf_setsockopt(sk, PF_INET, optname, optval, optlen);
1013                 release_sock(sk);
1014         }
1015 #endif
1016         return err;
1017 }
1018 EXPORT_SYMBOL(ip_setsockopt);
1019
1020 #ifdef CONFIG_COMPAT
1021 int compat_ip_setsockopt(struct sock *sk, int level, int optname,
1022                          char __user *optval, unsigned int optlen)
1023 {
1024         int err;
1025
1026         if (level != SOL_IP)
1027                 return -ENOPROTOOPT;
1028
1029         if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
1030                 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
1031                         ip_setsockopt);
1032
1033         err = do_ip_setsockopt(sk, level, optname, optval, optlen);
1034 #ifdef CONFIG_NETFILTER
1035         /* we need to exclude all possible ENOPROTOOPTs except default case */
1036         if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
1037                         optname != IP_IPSEC_POLICY &&
1038                         optname != IP_XFRM_POLICY &&
1039                         !ip_mroute_opt(optname)) {
1040                 lock_sock(sk);
1041                 err = compat_nf_setsockopt(sk, PF_INET, optname,
1042                                            optval, optlen);
1043                 release_sock(sk);
1044         }
1045 #endif
1046         return err;
1047 }
1048 EXPORT_SYMBOL(compat_ip_setsockopt);
1049 #endif
1050
1051 /*
1052  *      Get the options. Note for future reference. The GET of IP options gets
1053  *      the _received_ ones. The set sets the _sent_ ones.
1054  */
1055
1056 static int do_ip_getsockopt(struct sock *sk, int level, int optname,
1057                             char __user *optval, int __user *optlen)
1058 {
1059         struct inet_sock *inet = inet_sk(sk);
1060         int val;
1061         int len;
1062
1063         if (level != SOL_IP)
1064                 return -EOPNOTSUPP;
1065
1066         if (ip_mroute_opt(optname))
1067                 return ip_mroute_getsockopt(sk, optname, optval, optlen);
1068
1069         if (get_user(len, optlen))
1070                 return -EFAULT;
1071         if (len < 0)
1072                 return -EINVAL;
1073
1074         lock_sock(sk);
1075
1076         switch (optname) {
1077         case IP_OPTIONS:
1078         {
1079                 unsigned char optbuf[sizeof(struct ip_options)+40];
1080                 struct ip_options * opt = (struct ip_options *)optbuf;
1081                 opt->optlen = 0;
1082                 if (inet->opt)
1083                         memcpy(optbuf, inet->opt,
1084                                sizeof(struct ip_options)+
1085                                inet->opt->optlen);
1086                 release_sock(sk);
1087
1088                 if (opt->optlen == 0)
1089                         return put_user(0, optlen);
1090
1091                 ip_options_undo(opt);
1092
1093                 len = min_t(unsigned int, len, opt->optlen);
1094                 if (put_user(len, optlen))
1095                         return -EFAULT;
1096                 if (copy_to_user(optval, opt->__data, len))
1097                         return -EFAULT;
1098                 return 0;
1099         }
1100         case IP_PKTINFO:
1101                 val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0;
1102                 break;
1103         case IP_RECVTTL:
1104                 val = (inet->cmsg_flags & IP_CMSG_TTL) != 0;
1105                 break;
1106         case IP_RECVTOS:
1107                 val = (inet->cmsg_flags & IP_CMSG_TOS) != 0;
1108                 break;
1109         case IP_RECVOPTS:
1110                 val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0;
1111                 break;
1112         case IP_RETOPTS:
1113                 val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0;
1114                 break;
1115         case IP_PASSSEC:
1116                 val = (inet->cmsg_flags & IP_CMSG_PASSSEC) != 0;
1117                 break;
1118         case IP_RECVORIGDSTADDR:
1119                 val = (inet->cmsg_flags & IP_CMSG_ORIGDSTADDR) != 0;
1120                 break;
1121         case IP_TOS:
1122                 val = inet->tos;
1123                 break;
1124         case IP_TTL:
1125                 val = (inet->uc_ttl == -1 ?
1126                        sysctl_ip_default_ttl :
1127                        inet->uc_ttl);
1128                 break;
1129         case IP_HDRINCL:
1130                 val = inet->hdrincl;
1131                 break;
1132         case IP_NODEFRAG:
1133                 val = inet->nodefrag;
1134                 break;
1135         case IP_MTU_DISCOVER:
1136                 val = inet->pmtudisc;
1137                 break;
1138         case IP_MTU:
1139         {
1140                 struct dst_entry *dst;
1141                 val = 0;
1142                 dst = sk_dst_get(sk);
1143                 if (dst) {
1144                         val = dst_mtu(dst);
1145                         dst_release(dst);
1146                 }
1147                 if (!val) {
1148                         release_sock(sk);
1149                         return -ENOTCONN;
1150                 }
1151                 break;
1152         }
1153         case IP_RECVERR:
1154                 val = inet->recverr;
1155                 break;
1156         case IP_MULTICAST_TTL:
1157                 val = inet->mc_ttl;
1158                 break;
1159         case IP_MULTICAST_LOOP:
1160                 val = inet->mc_loop;
1161                 break;
1162         case IP_MULTICAST_IF:
1163         {
1164                 struct in_addr addr;
1165                 len = min_t(unsigned int, len, sizeof(struct in_addr));
1166                 addr.s_addr = inet->mc_addr;
1167                 release_sock(sk);
1168
1169                 if (put_user(len, optlen))
1170                         return -EFAULT;
1171                 if (copy_to_user(optval, &addr, len))
1172                         return -EFAULT;
1173                 return 0;
1174         }
1175         case IP_MSFILTER:
1176         {
1177                 struct ip_msfilter msf;
1178                 int err;
1179
1180                 if (len < IP_MSFILTER_SIZE(0)) {
1181                         release_sock(sk);
1182                         return -EINVAL;
1183                 }
1184                 if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) {
1185                         release_sock(sk);
1186                         return -EFAULT;
1187                 }
1188                 err = ip_mc_msfget(sk, &msf,
1189                                    (struct ip_msfilter __user *)optval, optlen);
1190                 release_sock(sk);
1191                 return err;
1192         }
1193         case MCAST_MSFILTER:
1194         {
1195                 struct group_filter gsf;
1196                 int err;
1197
1198                 if (len < GROUP_FILTER_SIZE(0)) {
1199                         release_sock(sk);
1200                         return -EINVAL;
1201                 }
1202                 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) {
1203                         release_sock(sk);
1204                         return -EFAULT;
1205                 }
1206                 err = ip_mc_gsfget(sk, &gsf,
1207                                    (struct group_filter __user *)optval,
1208                                    optlen);
1209                 release_sock(sk);
1210                 return err;
1211         }
1212         case IP_MULTICAST_ALL:
1213                 val = inet->mc_all;
1214                 break;
1215         case IP_PKTOPTIONS:
1216         {
1217                 struct msghdr msg;
1218
1219                 release_sock(sk);
1220
1221                 if (sk->sk_type != SOCK_STREAM)
1222                         return -ENOPROTOOPT;
1223
1224                 msg.msg_control = optval;
1225                 msg.msg_controllen = len;
1226                 msg.msg_flags = 0;
1227
1228                 if (inet->cmsg_flags & IP_CMSG_PKTINFO) {
1229                         struct in_pktinfo info;
1230
1231                         info.ipi_addr.s_addr = inet->inet_rcv_saddr;
1232                         info.ipi_spec_dst.s_addr = inet->inet_rcv_saddr;
1233                         info.ipi_ifindex = inet->mc_index;
1234                         put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
1235                 }
1236                 if (inet->cmsg_flags & IP_CMSG_TTL) {
1237                         int hlim = inet->mc_ttl;
1238                         put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim);
1239                 }
1240                 len -= msg.msg_controllen;
1241                 return put_user(len, optlen);
1242         }
1243         case IP_FREEBIND:
1244                 val = inet->freebind;
1245                 break;
1246         case IP_TRANSPARENT:
1247                 val = inet->transparent;
1248                 break;
1249         case IP_MINTTL:
1250                 val = inet->min_ttl;
1251                 break;
1252         default:
1253                 release_sock(sk);
1254                 return -ENOPROTOOPT;
1255         }
1256         release_sock(sk);
1257
1258         if (len < sizeof(int) && len > 0 && val >= 0 && val <= 255) {
1259                 unsigned char ucval = (unsigned char)val;
1260                 len = 1;
1261                 if (put_user(len, optlen))
1262                         return -EFAULT;
1263                 if (copy_to_user(optval, &ucval, 1))
1264                         return -EFAULT;
1265         } else {
1266                 len = min_t(unsigned int, sizeof(int), len);
1267                 if (put_user(len, optlen))
1268                         return -EFAULT;
1269                 if (copy_to_user(optval, &val, len))
1270                         return -EFAULT;
1271         }
1272         return 0;
1273 }
1274
1275 int ip_getsockopt(struct sock *sk, int level,
1276                   int optname, char __user *optval, int __user *optlen)
1277 {
1278         int err;
1279
1280         err = do_ip_getsockopt(sk, level, optname, optval, optlen);
1281 #ifdef CONFIG_NETFILTER
1282         /* we need to exclude all possible ENOPROTOOPTs except default case */
1283         if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS &&
1284                         !ip_mroute_opt(optname)) {
1285                 int len;
1286
1287                 if (get_user(len, optlen))
1288                         return -EFAULT;
1289
1290                 lock_sock(sk);
1291                 err = nf_getsockopt(sk, PF_INET, optname, optval,
1292                                 &len);
1293                 release_sock(sk);
1294                 if (err >= 0)
1295                         err = put_user(len, optlen);
1296                 return err;
1297         }
1298 #endif
1299         return err;
1300 }
1301 EXPORT_SYMBOL(ip_getsockopt);
1302
1303 #ifdef CONFIG_COMPAT
1304 int compat_ip_getsockopt(struct sock *sk, int level, int optname,
1305                          char __user *optval, int __user *optlen)
1306 {
1307         int err;
1308
1309         if (optname == MCAST_MSFILTER)
1310                 return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1311                         ip_getsockopt);
1312
1313         err = do_ip_getsockopt(sk, level, optname, optval, optlen);
1314
1315 #ifdef CONFIG_NETFILTER
1316         /* we need to exclude all possible ENOPROTOOPTs except default case */
1317         if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS &&
1318                         !ip_mroute_opt(optname)) {
1319                 int len;
1320
1321                 if (get_user(len, optlen))
1322                         return -EFAULT;
1323
1324                 lock_sock(sk);
1325                 err = compat_nf_getsockopt(sk, PF_INET, optname, optval, &len);
1326                 release_sock(sk);
1327                 if (err >= 0)
1328                         err = put_user(len, optlen);
1329                 return err;
1330         }
1331 #endif
1332         return err;
1333 }
1334 EXPORT_SYMBOL(compat_ip_getsockopt);
1335 #endif