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