net/core/sock.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  *              Generic socket support routines. Memory allocators, socket lock/release
   7  *              handler for protocols to use and generic option handler.
   8  *
   9  *
  10  * Version:     $Id: sock.c,v 1.117 2002/02/01 22:01:03 davem Exp $
  11  *
  12  * Authors:     Ross Biro, <bir7@leland.Stanford.Edu>
  13  *              Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
  14  *              Florian La Roche, <flla@stud.uni-sb.de>
  15  *              Alan Cox, <A.Cox@swansea.ac.uk>
  16  *
  17  * Fixes:
  18  *              Alan Cox        :       Numerous verify_area() problems
  19  *              Alan Cox        :       Connecting on a connecting socket
  20  *                                      now returns an error for tcp.
  21  *              Alan Cox        :       sock->protocol is set correctly.
  22  *                                      and is not sometimes left as 0.
  23  *              Alan Cox        :       connect handles icmp errors on a
  24  *                                      connect properly. Unfortunately there
  25  *                                      is a restart syscall nasty there. I
  26  *                                      can't match BSD without hacking the C
  27  *                                      library. Ideas urgently sought!
  28  *              Alan Cox        :       Disallow bind() to addresses that are
  29  *                                      not ours - especially broadcast ones!!
  30  *              Alan Cox        :       Socket 1024 _IS_ ok for users. (fencepost)
  31  *              Alan Cox        :       sock_wfree/sock_rfree don't destroy sockets,
  32  *                                      instead they leave that for the DESTROY timer.
  33  *              Alan Cox        :       Clean up error flag in accept
  34  *              Alan Cox        :       TCP ack handling is buggy, the DESTROY timer
  35  *                                      was buggy. Put a remove_sock() in the handler
  36  *                                      for memory when we hit 0. Also altered the timer
  37  *                                      code. The ACK stuff can wait and needs major
  38  *                                      TCP layer surgery.
  39  *              Alan Cox        :       Fixed TCP ack bug, removed remove sock
  40  *                                      and fixed timer/inet_bh race.
  41  *              Alan Cox        :       Added zapped flag for TCP
  42  *              Alan Cox        :       Move kfree_skb into skbuff.c and tidied up surplus code
  43  *              Alan Cox        :       for new sk_buff allocations wmalloc/rmalloc now call alloc_skb
  44  *              Alan Cox        :       kfree_s calls now are kfree_skbmem so we can track skb resources
  45  *              Alan Cox        :       Supports socket option broadcast now as does udp. Packet and raw need fixing.
  46  *              Alan Cox        :       Added RCVBUF,SNDBUF size setting. It suddenly occurred to me how easy it was so...
  47  *              Rick Sladkey    :       Relaxed UDP rules for matching packets.
  48  *              C.E.Hawkins     :       IFF_PROMISC/SIOCGHWADDR support
  49  *      Pauline Middelink       :       identd support
  50  *              Alan Cox        :       Fixed connect() taking signals I think.
  51  *              Alan Cox        :       SO_LINGER supported
  52  *              Alan Cox        :       Error reporting fixes
  53  *              Anonymous       :       inet_create tidied up (sk->reuse setting)
  54  *              Alan Cox        :       inet sockets don't set sk->type!
  55  *              Alan Cox        :       Split socket option code
  56  *              Alan Cox        :       Callbacks
  57  *              Alan Cox        :       Nagle flag for Charles & Johannes stuff
  58  *              Alex            :       Removed restriction on inet fioctl
  59  *              Alan Cox        :       Splitting INET from NET core
  60  *              Alan Cox        :       Fixed bogus SO_TYPE handling in getsockopt()
  61  *              Adam Caldwell   :       Missing return in SO_DONTROUTE/SO_DEBUG code
  62  *              Alan Cox        :       Split IP from generic code
  63  *              Alan Cox        :       New kfree_skbmem()
  64  *              Alan Cox        :       Make SO_DEBUG superuser only.
  65  *              Alan Cox        :       Allow anyone to clear SO_DEBUG
  66  *                                      (compatibility fix)
  67  *              Alan Cox        :       Added optimistic memory grabbing for AF_UNIX throughput.
  68  *              Alan Cox        :       Allocator for a socket is settable.
  69  *              Alan Cox        :       SO_ERROR includes soft errors.
  70  *              Alan Cox        :       Allow NULL arguments on some SO_ opts
  71  *              Alan Cox        :       Generic socket allocation to make hooks
  72  *                                      easier (suggested by Craig Metz).
  73  *              Michael Pall    :       SO_ERROR returns positive errno again
  74  *              Steve Whitehouse:       Added default destructor to free
  75  *                                      protocol private data.
  76  *              Steve Whitehouse:       Added various other default routines
  77  *                                      common to several socket families.
  78  *              Chris Evans     :       Call suser() check last on F_SETOWN
  79  *              Jay Schulist    :       Added SO_ATTACH_FILTER and SO_DETACH_FILTER.
  80  *              Andi Kleen      :       Add sock_kmalloc()/sock_kfree_s()
  81  *              Andi Kleen      :       Fix write_space callback
  82  *              Chris Evans     :       Security fixes - signedness again
  83  *              Arnaldo C. Melo :       cleanups, use skb_queue_purge
  84  *
  85  * To Fix:
  86  *
  87  *
  88  *              This program is free software; you can redistribute it and/or
  89  *              modify it under the terms of the GNU General Public License
  90  *              as published by the Free Software Foundation; either version
  91  *              2 of the License, or (at your option) any later version.
  92  */
  93
  94 #include <linux/config.h>
  95 #include <linux/errno.h>
  96 #include <linux/types.h>
  97 #include <linux/socket.h>
  98 #include <linux/in.h>
  99 #include <linux/kernel.h>
 100 #include <linux/major.h>
 101 #include <linux/module.h>
 102 #include <linux/sched.h>
 103 #include <linux/timer.h>
 104 #include <linux/string.h>
 105 #include <linux/sockios.h>
 106 #include <linux/net.h>
 107 #include <linux/mm.h>
 108 #include <linux/slab.h>
 109 #include <linux/interrupt.h>
 110 #include <linux/poll.h>
 111 #include <linux/tcp.h>
 112 #include <linux/init.h>
 113
 114 #include <asm/uaccess.h>
 115 #include <asm/system.h>
 116
 117 #include <linux/netdevice.h>
 118 #include <net/protocol.h>
 119 #include <linux/skbuff.h>
 120 #include <net/sock.h>
 121 #include <linux/ipsec.h>
 122
 123 #include <linux/filter.h>
 124 #include <linux/vs_socket.h>
 125
 126 #ifdef CONFIG_INET
 127 #include <net/tcp.h>
 128 #endif
 129
 130 /* Take into consideration the size of the struct sk_buff overhead in the
 131  * determination of these values, since that is non-constant across
 132  * platforms.  This makes socket queueing behavior and performance
 133  * not depend upon such differences.
 134  */
 135 #define _SK_MEM_PACKETS         256
 136 #define _SK_MEM_OVERHEAD        (sizeof(struct sk_buff) + 256)
 137 #define SK_WMEM_MAX             (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
 138 #define SK_RMEM_MAX             (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
 139
 140 /* Run time adjustable parameters. */
 141 __u32 sysctl_wmem_max = SK_WMEM_MAX;
 142 __u32 sysctl_rmem_max = SK_RMEM_MAX;
 143 __u32 sysctl_wmem_default = SK_WMEM_MAX;
 144 __u32 sysctl_rmem_default = SK_RMEM_MAX;
 145
 146 /* Maximal space eaten by iovec or ancilliary data plus some space */
 147 int sysctl_optmem_max = sizeof(unsigned long)*(2*UIO_MAXIOV + 512);
 148
 149 static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen)
 150 {
 151         struct timeval tv;
 152
 153         if (optlen < sizeof(tv))
 154                 return -EINVAL;
 155         if (copy_from_user(&tv, optval, sizeof(tv)))
 156                 return -EFAULT;
 157
 158         *timeo_p = MAX_SCHEDULE_TIMEOUT;
 159         if (tv.tv_sec == 0 && tv.tv_usec == 0)
 160                 return 0;
 161         if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1))
 162                 *timeo_p = tv.tv_sec*HZ + (tv.tv_usec+(1000000/HZ-1))/(1000000/HZ);
 163         return 0;
 164 }
 165
 166 static void sock_warn_obsolete_bsdism(const char *name)
 167 {
 168         static int warned;
 169         static char warncomm[16];
 170         if (strcmp(warncomm, current->comm) && warned < 5) {
 171                 strcpy(warncomm,  current->comm);
 172                 printk(KERN_WARNING "process `%s' is using obsolete "
 173                        "%s SO_BSDCOMPAT\n", warncomm, name);
 174                 warned++;
 175         }
 176 }
 177
 178 /*
 179  *      This is meant for all protocols to use and covers goings on
 180  *      at the socket level. Everything here is generic.
 181  */
 182
 183 int sock_setsockopt(struct socket *sock, int level, int optname,
 184                     char __user *optval, int optlen)
 185 {
 186         struct sock *sk=sock->sk;
 187         struct sk_filter *filter;
 188         int val;
 189         int valbool;
 190         struct linger ling;
 191         int ret = 0;
 192
 193         /*
 194          *      Options without arguments
 195          */
 196
 197 #ifdef SO_DONTLINGER            /* Compatibility item... */
 198         switch (optname) {
 199                 case SO_DONTLINGER:
 200                         sock_reset_flag(sk, SOCK_LINGER);
 201                         return 0;
 202         }
 203 #endif
 204
 205         if(optlen<sizeof(int))
 206                 return(-EINVAL);
 207
 208         if (get_user(val, (int __user *)optval))
 209                 return -EFAULT;
 210
 211         valbool = val?1:0;
 212
 213         lock_sock(sk);
 214
 215         switch(optname)
 216         {
 217                 case SO_DEBUG:
 218                         if(val && !capable(CAP_NET_ADMIN))
 219                         {
 220                                 ret = -EACCES;
 221                         }
 222                         else
 223                                 sk->sk_debug = valbool;
 224                         break;
 225                 case SO_REUSEADDR:
 226                         sk->sk_reuse = valbool;
 227                         break;
 228                 case SO_TYPE:
 229                 case SO_ERROR:
 230                         ret = -ENOPROTOOPT;
 231                         break;
 232                 case SO_DONTROUTE:
 233                         sk->sk_localroute = valbool;
 234                         break;
 235                 case SO_BROADCAST:
 236                         sock_valbool_flag(sk, SOCK_BROADCAST, valbool);
 237                         break;
 238                 case SO_SNDBUF:
 239                         /* Don't error on this BSD doesn't and if you think
 240                            about it this is right. Otherwise apps have to
 241                            play 'guess the biggest size' games. RCVBUF/SNDBUF
 242                            are treated in BSD as hints */
 243
 244                         if (val > sysctl_wmem_max)
 245                                 val = sysctl_wmem_max;
 246
 247                         sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
 248                         if ((val * 2) < SOCK_MIN_SNDBUF)
 249                                 sk->sk_sndbuf = SOCK_MIN_SNDBUF;
 250                         else
 251                                 sk->sk_sndbuf = val * 2;
 252
 253                         /*
 254                          *      Wake up sending tasks if we
 255                          *      upped the value.
 256                          */
 257                         sk->sk_write_space(sk);
 258                         break;
 259
 260                 case SO_RCVBUF:
 261                         /* Don't error on this BSD doesn't and if you think
 262                            about it this is right. Otherwise apps have to
 263                            play 'guess the biggest size' games. RCVBUF/SNDBUF
 264                            are treated in BSD as hints */
 265
 266                         if (val > sysctl_rmem_max)
 267                                 val = sysctl_rmem_max;
 268
 269                         sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
 270                         /* FIXME: is this lower bound the right one? */
 271                         if ((val * 2) < SOCK_MIN_RCVBUF)
 272                                 sk->sk_rcvbuf = SOCK_MIN_RCVBUF;
 273                         else
 274                                 sk->sk_rcvbuf = val * 2;
 275                         break;
 276
 277                 case SO_KEEPALIVE:
 278 #ifdef CONFIG_INET
 279                         if (sk->sk_protocol == IPPROTO_TCP)
 280                                 tcp_set_keepalive(sk, valbool);
 281 #endif
 282                         sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool);
 283                         break;
 284
 285                 case SO_OOBINLINE:
 286                         sock_valbool_flag(sk, SOCK_URGINLINE, valbool);
 287                         break;
 288
 289                 case SO_NO_CHECK:
 290                         sk->sk_no_check = valbool;
 291                         break;
 292
 293                 case SO_PRIORITY:
 294                         if ((val >= 0 && val <= 6) || capable(CAP_NET_ADMIN))
 295                                 sk->sk_priority = val;
 296                         else
 297                                 ret = -EPERM;
 298                         break;
 299
 300                 case SO_LINGER:
 301                         if(optlen<sizeof(ling)) {
 302                                 ret = -EINVAL;  /* 1003.1g */
 303                                 break;
 304                         }
 305                         if (copy_from_user(&ling,optval,sizeof(ling))) {
 306                                 ret = -EFAULT;
 307                                 break;
 308                         }
 309                         if (!ling.l_onoff)
 310                                 sock_reset_flag(sk, SOCK_LINGER);
 311                         else {
 312 #if (BITS_PER_LONG == 32)
 313                                 if (ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ)
 314                                         sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT;
 315                                 else
 316 #endif
 317                                         sk->sk_lingertime = ling.l_linger * HZ;
 318                                 sock_set_flag(sk, SOCK_LINGER);
 319                         }
 320                         break;
 321
 322                 case SO_BSDCOMPAT:
 323                         sock_warn_obsolete_bsdism("setsockopt");
 324                         break;
 325
 326                 case SO_PASSCRED:
 327                         if (valbool)
 328                                 set_bit(SOCK_PASS_CRED, &sock->flags);
 329                         else
 330                                 clear_bit(SOCK_PASS_CRED, &sock->flags);
 331                         break;
 332
 333                 case SO_TIMESTAMP:
 334                         sk->sk_rcvtstamp = valbool;
 335                         if (valbool)
 336                                 sock_enable_timestamp(sk);
 337                         break;
 338
 339                 case SO_RCVLOWAT:
 340                         if (val < 0)
 341                                 val = INT_MAX;
 342                         sk->sk_rcvlowat = val ? : 1;
 343                         break;
 344
 345                 case SO_RCVTIMEO:
 346                         ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen);
 347                         break;
 348
 349                 case SO_SNDTIMEO:
 350                         ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen);
 351                         break;
 352
 353 #ifdef CONFIG_NETDEVICES
 354                 case SO_BINDTODEVICE:
 355                 {
 356                         char devname[IFNAMSIZ];
 357
 358                         /* Sorry... */
 359                         if (!capable(CAP_NET_RAW)) {
 360                                 ret = -EPERM;
 361                                 break;
 362                         }
 363
 364                         /* Bind this socket to a particular device like "eth0",
 365                          * as specified in the passed interface name. If the
 366                          * name is "" or the option length is zero the socket
 367                          * is not bound.
 368                          */
 369
 370                         if (!valbool) {
 371                                 sk->sk_bound_dev_if = 0;
 372                         } else {
 373                                 if (optlen > IFNAMSIZ)
 374                                         optlen = IFNAMSIZ;
 375                                 if (copy_from_user(devname, optval, optlen)) {
 376                                         ret = -EFAULT;
 377                                         break;
 378                                 }
 379
 380                                 /* Remove any cached route for this socket. */
 381                                 sk_dst_reset(sk);
 382
 383                                 if (devname[0] == '\0') {
 384                                         sk->sk_bound_dev_if = 0;
 385                                 } else {
 386                                         struct net_device *dev = dev_get_by_name(devname);
 387                                         if (!dev) {
 388                                                 ret = -ENODEV;
 389                                                 break;
 390                                         }
 391                                         sk->sk_bound_dev_if = dev->ifindex;
 392                                         dev_put(dev);
 393                                 }
 394                         }
 395                         break;
 396                 }
 397 #endif
 398
 399
 400                 case SO_ATTACH_FILTER:
 401                         ret = -EINVAL;
 402                         if (optlen == sizeof(struct sock_fprog)) {
 403                                 struct sock_fprog fprog;
 404
 405                                 ret = -EFAULT;
 406                                 if (copy_from_user(&fprog, optval, sizeof(fprog)))
 407                                         break;
 408
 409                                 ret = sk_attach_filter(&fprog, sk);
 410                         }
 411                         break;
 412
 413                 case SO_DETACH_FILTER:
 414                         spin_lock_bh(&sk->sk_lock.slock);
 415                         filter = sk->sk_filter;
 416                         if (filter) {
 417                                 sk->sk_filter = NULL;
 418                                 spin_unlock_bh(&sk->sk_lock.slock);
 419                                 sk_filter_release(sk, filter);
 420                                 break;
 421                         }
 422                         spin_unlock_bh(&sk->sk_lock.slock);
 423                         ret = -ENONET;
 424                         break;
 425
 426                 /* We implement the SO_SNDLOWAT etc to
 427                    not be settable (1003.1g 5.3) */
 428                 default:
 429                         ret = -ENOPROTOOPT;
 430                         break;
 431         }
 432         release_sock(sk);
 433         return ret;
 434 }
 435
 436
 437 int sock_getsockopt(struct socket *sock, int level, int optname,
 438                     char __user *optval, int __user *optlen)
 439 {
 440         struct sock *sk = sock->sk;
 441
 442         union
 443         {
 444                 int val;
 445                 struct linger ling;
 446                 struct timeval tm;
 447         } v;
 448
 449         unsigned int lv=sizeof(int),len;
 450
 451         if(get_user(len,optlen))
 452                 return -EFAULT;
 453         if(len < 0)
 454                 return -EINVAL;
 455
 456         switch(optname)
 457         {
 458                 case SO_DEBUG:
 459                         v.val = sk->sk_debug;
 460                         break;
 461
 462                 case SO_DONTROUTE:
 463                         v.val = sk->sk_localroute;
 464                         break;
 465
 466                 case SO_BROADCAST:
 467                         v.val = !!sock_flag(sk, SOCK_BROADCAST);
 468                         break;
 469
 470                 case SO_SNDBUF:
 471                         v.val = sk->sk_sndbuf;
 472                         break;
 473
 474                 case SO_RCVBUF:
 475                         v.val = sk->sk_rcvbuf;
 476                         break;
 477
 478                 case SO_REUSEADDR:
 479                         v.val = sk->sk_reuse;
 480                         break;
 481
 482                 case SO_KEEPALIVE:
 483                         v.val = !!sock_flag(sk, SOCK_KEEPOPEN);
 484                         break;
 485
 486                 case SO_TYPE:
 487                         v.val = sk->sk_type;
 488                         break;
 489
 490                 case SO_ERROR:
 491                         v.val = -sock_error(sk);
 492                         if(v.val==0)
 493                                 v.val = xchg(&sk->sk_err_soft, 0);
 494                         break;
 495
 496                 case SO_OOBINLINE:
 497                         v.val = !!sock_flag(sk, SOCK_URGINLINE);
 498                         break;
 499
 500                 case SO_NO_CHECK:
 501                         v.val = sk->sk_no_check;
 502                         break;
 503
 504                 case SO_PRIORITY:
 505                         v.val = sk->sk_priority;
 506                         break;
 507
 508                 case SO_LINGER:
 509                         lv              = sizeof(v.ling);
 510                         v.ling.l_onoff  = !!sock_flag(sk, SOCK_LINGER);
 511                         v.ling.l_linger = sk->sk_lingertime / HZ;
 512                         break;
 513
 514                 case SO_BSDCOMPAT:
 515                         sock_warn_obsolete_bsdism("getsockopt");
 516                         break;
 517
 518                 case SO_TIMESTAMP:
 519                         v.val = sk->sk_rcvtstamp;
 520                         break;
 521
 522                 case SO_RCVTIMEO:
 523                         lv=sizeof(struct timeval);
 524                         if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) {
 525                                 v.tm.tv_sec = 0;
 526                                 v.tm.tv_usec = 0;
 527                         } else {
 528                                 v.tm.tv_sec = sk->sk_rcvtimeo / HZ;
 529                                 v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000) / HZ;
 530                         }
 531                         break;
 532
 533                 case SO_SNDTIMEO:
 534                         lv=sizeof(struct timeval);
 535                         if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) {
 536                                 v.tm.tv_sec = 0;
 537                                 v.tm.tv_usec = 0;
 538                         } else {
 539                                 v.tm.tv_sec = sk->sk_sndtimeo / HZ;
 540                                 v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000) / HZ;
 541                         }
 542                         break;
 543
 544                 case SO_RCVLOWAT:
 545                         v.val = sk->sk_rcvlowat;
 546                         break;
 547
 548                 case SO_SNDLOWAT:
 549                         v.val=1;
 550                         break;
 551
 552                 case SO_PASSCRED:
 553                         v.val = test_bit(SOCK_PASS_CRED, &sock->flags)?1:0;
 554                         break;
 555
 556                 case SO_PEERCRED:
 557                         if (len > sizeof(sk->sk_peercred))
 558                                 len = sizeof(sk->sk_peercred);
 559                         if (copy_to_user(optval, &sk->sk_peercred, len))
 560                                 return -EFAULT;
 561                         goto lenout;
 562
 563                 case SO_PEERNAME:
 564                 {
 565                         char address[128];
 566
 567                         if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2))
 568                                 return -ENOTCONN;
 569                         if (lv < len)
 570                                 return -EINVAL;
 571                         if (copy_to_user(optval, address, len))
 572                                 return -EFAULT;
 573                         goto lenout;
 574                 }
 575
 576                 /* Dubious BSD thing... Probably nobody even uses it, but
 577                  * the UNIX standard wants it for whatever reason... -DaveM
 578                  */
 579                 case SO_ACCEPTCONN:
 580                         v.val = sk->sk_state == TCP_LISTEN;
 581                         break;
 582
 583                 case SO_PEERSEC:
 584                         return security_socket_getpeersec(sock, optval, optlen, len);
 585
 586                 default:
 587                         return(-ENOPROTOOPT);
 588         }
 589         if (len > lv)
 590                 len = lv;
 591         if (copy_to_user(optval, &v, len))
 592                 return -EFAULT;
 593 lenout:
 594         if (put_user(len, optlen))
 595                 return -EFAULT;
 596         return 0;
 597 }
 598
 599 static kmem_cache_t *sk_cachep;
 600
 601 /**
 602  *      sk_alloc - All socket objects are allocated here
 603  *      @family - protocol family
 604  *      @priority - for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
 605  *      @zero_it - zeroes the allocated sock
 606  *      @slab - alternate slab
 607  *
 608  *      All socket objects are allocated here. If @zero_it is non-zero
 609  *      it should have the size of the are to be zeroed, because the
 610  *      private slabcaches have different sizes of the generic struct sock.
 611  *      1 has been kept as a way to say sizeof(struct sock).
 612  */
 613 struct sock *sk_alloc(int family, int priority, int zero_it, kmem_cache_t *slab)
 614 {
 615         struct sock *sk = NULL;
 616
 617         if (!slab)
 618                 slab = sk_cachep;
 619         sk = kmem_cache_alloc(slab, priority);
 620         if (sk) {
 621                 if (zero_it) {
 622                         memset(sk, 0,
 623                                zero_it == 1 ? sizeof(struct sock) : zero_it);
 624                         sk->sk_family = family;
 625                         sock_lock_init(sk);
 626                 }
 627                 sk->sk_slab = slab;
 628                 sock_vx_init(sk);
 629                 sock_nx_init(sk);
 630
 631                 if (security_sk_alloc(sk, family, priority)) {
 632                         kmem_cache_free(slab, sk);
 633                         sk = NULL;
 634                 }
 635         }
 636         return sk;
 637 }
 638
 639 void sk_free(struct sock *sk)
 640 {
 641         struct sk_filter *filter;
 642         struct module *owner = sk->sk_owner;
 643
 644         if (sk->sk_destruct)
 645                 sk->sk_destruct(sk);
 646
 647         filter = sk->sk_filter;
 648         if (filter) {
 649                 sk_filter_release(sk, filter);
 650                 sk->sk_filter = NULL;
 651         }
 652
 653         sock_disable_timestamp(sk);
 654
 655         if (atomic_read(&sk->sk_omem_alloc))
 656                 printk(KERN_DEBUG "%s: optmem leakage (%d bytes) detected.\n",
 657                        __FUNCTION__, atomic_read(&sk->sk_omem_alloc));
 658
 659         security_sk_free(sk);
 660         BUG_ON(sk->sk_vx_info);
 661         BUG_ON(sk->sk_nx_info);
 662         kmem_cache_free(sk->sk_slab, sk);
 663         module_put(owner);
 664 }
 665
 666 void __init sk_init(void)
 667 {
 668         sk_cachep = kmem_cache_create("sock", sizeof(struct sock), 0,
 669                                       SLAB_HWCACHE_ALIGN, 0, 0);
 670         if (!sk_cachep)
 671                 printk(KERN_CRIT "sk_init: Cannot create sock SLAB cache!");
 672
 673         if (num_physpages <= 4096) {
 674                 sysctl_wmem_max = 32767;
 675                 sysctl_rmem_max = 32767;
 676                 sysctl_wmem_default = 32767;
 677                 sysctl_rmem_default = 32767;
 678         } else if (num_physpages >= 131072) {
 679                 sysctl_wmem_max = 131071;
 680                 sysctl_rmem_max = 131071;
 681         }
 682 }
 683
 684 /*
 685  *      Simple resource managers for sockets.
 686  */
 687
 688
 689 /*
 690  * Write buffer destructor automatically called from kfree_skb.
 691  */
 692 void sock_wfree(struct sk_buff *skb)
 693 {
 694         struct sock *sk = skb->sk;
 695
 696         /* In case it might be waiting for more memory. */
 697         atomic_sub(skb->truesize, &sk->sk_wmem_alloc);
 698         if (!sk->sk_use_write_queue)
 699                 sk->sk_write_space(sk);
 700         sock_put(sk);
 701 }
 702
 703 /*
 704  * Read buffer destructor automatically called from kfree_skb.
 705  */
 706 void sock_rfree(struct sk_buff *skb)
 707 {
 708         struct sock *sk = skb->sk;
 709
 710         atomic_sub(skb->truesize, &sk->sk_rmem_alloc);
 711 }
 712
 713 /*
 714  * Allocate a skb from the socket's send buffer.
 715  */
 716 struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force, int priority)
 717 {
 718         if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
 719                 struct sk_buff * skb = alloc_skb(size, priority);
 720                 if (skb) {
 721                         skb_set_owner_w(skb, sk);
 722                         return skb;
 723                 }
 724         }
 725         return NULL;
 726 }
 727
 728 /*
 729  * Allocate a skb from the socket's receive buffer.
 730  */
 731 struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force, int priority)
 732 {
 733         if (force || atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) {
 734                 struct sk_buff *skb = alloc_skb(size, priority);
 735                 if (skb) {
 736                         skb_set_owner_r(skb, sk);
 737                         return skb;
 738                 }
 739         }
 740         return NULL;
 741 }
 742
 743 /*
 744  * Allocate a memory block from the socket's option memory buffer.
 745  */
 746 void *sock_kmalloc(struct sock *sk, int size, int priority)
 747 {
 748         if ((unsigned)size <= sysctl_optmem_max &&
 749             atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) {
 750                 void *mem;
 751                 /* First do the add, to avoid the race if kmalloc
 752                  * might sleep.
 753                  */
 754                 atomic_add(size, &sk->sk_omem_alloc);
 755                 mem = kmalloc(size, priority);
 756                 if (mem)
 757                         return mem;
 758                 atomic_sub(size, &sk->sk_omem_alloc);
 759         }
 760         return NULL;
 761 }
 762
 763 /*
 764  * Free an option memory block.
 765  */
 766 void sock_kfree_s(struct sock *sk, void *mem, int size)
 767 {
 768         kfree(mem);
 769         atomic_sub(size, &sk->sk_omem_alloc);
 770 }
 771
 772 /* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
 773    I think, these locks should be removed for datagram sockets.
 774  */
 775 static long sock_wait_for_wmem(struct sock * sk, long timeo)
 776 {
 777         DEFINE_WAIT(wait);
 778
 779         clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
 780         for (;;) {
 781                 if (!timeo)
 782                         break;
 783                 if (signal_pending(current))
 784                         break;
 785                 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
 786                 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
 787                 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf)
 788                         break;
 789                 if (sk->sk_shutdown & SEND_SHUTDOWN)
 790                         break;
 791                 if (sk->sk_err)
 792                         break;
 793                 timeo = schedule_timeout(timeo);
 794         }
 795         finish_wait(sk->sk_sleep, &wait);
 796         return timeo;
 797 }
 798
 799
 800 /*
 801  *      Generic send/receive buffer handlers
 802  */
 803
 804 struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len,
 805                                      unsigned long data_len, int noblock, int *errcode)
 806 {
 807         struct sk_buff *skb;
 808         unsigned int gfp_mask;
 809         long timeo;
 810         int err;
 811
 812         gfp_mask = sk->sk_allocation;
 813         if (gfp_mask & __GFP_WAIT)
 814                 gfp_mask |= __GFP_REPEAT;
 815
 816         timeo = sock_sndtimeo(sk, noblock);
 817         while (1) {
 818                 err = sock_error(sk);
 819                 if (err != 0)
 820                         goto failure;
 821
 822                 err = -EPIPE;
 823                 if (sk->sk_shutdown & SEND_SHUTDOWN)
 824                         goto failure;
 825
 826                 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
 827                         skb = alloc_skb(header_len, sk->sk_allocation);
 828                         if (skb) {
 829                                 int npages;
 830                                 int i;
 831
 832                                 /* No pages, we're done... */
 833                                 if (!data_len)
 834                                         break;
 835
 836                                 npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
 837                                 skb->truesize += data_len;
 838                                 skb_shinfo(skb)->nr_frags = npages;
 839                                 for (i = 0; i < npages; i++) {
 840                                         struct page *page;
 841                                         skb_frag_t *frag;
 842
 843                                         page = alloc_pages(sk->sk_allocation, 0);
 844                                         if (!page) {
 845                                                 err = -ENOBUFS;
 846                                                 skb_shinfo(skb)->nr_frags = i;
 847                                                 kfree_skb(skb);
 848                                                 goto failure;
 849                                         }
 850
 851                                         frag = &skb_shinfo(skb)->frags[i];
 852                                         frag->page = page;
 853                                         frag->page_offset = 0;
 854                                         frag->size = (data_len >= PAGE_SIZE ?
 855                                                       PAGE_SIZE :
 856                                                       data_len);
 857                                         data_len -= PAGE_SIZE;
 858                                 }
 859
 860                                 /* Full success... */
 861                                 break;
 862                         }
 863                         err = -ENOBUFS;
 864                         goto failure;
 865                 }
 866                 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
 867                 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
 868                 err = -EAGAIN;
 869                 if (!timeo)
 870                         goto failure;
 871                 if (signal_pending(current))
 872                         goto interrupted;
 873                 timeo = sock_wait_for_wmem(sk, timeo);
 874         }
 875
 876         skb_set_owner_w(skb, sk);
 877         return skb;
 878
 879 interrupted:
 880         err = sock_intr_errno(timeo);
 881 failure:
 882         *errcode = err;
 883         return NULL;
 884 }
 885
 886 struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
 887                                     int noblock, int *errcode)
 888 {
 889         return sock_alloc_send_pskb(sk, size, 0, noblock, errcode);
 890 }
 891
 892 void __lock_sock(struct sock *sk)
 893 {
 894         DEFINE_WAIT(wait);
 895
 896         for(;;) {
 897                 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
 898                                         TASK_UNINTERRUPTIBLE);
 899                 spin_unlock_bh(&sk->sk_lock.slock);
 900                 schedule();
 901                 spin_lock_bh(&sk->sk_lock.slock);
 902                 if(!sock_owned_by_user(sk))
 903                         break;
 904         }
 905         finish_wait(&sk->sk_lock.wq, &wait);
 906 }
 907
 908 void __release_sock(struct sock *sk)
 909 {
 910         struct sk_buff *skb = sk->sk_backlog.head;
 911
 912         do {
 913                 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
 914                 bh_unlock_sock(sk);
 915
 916                 do {
 917                         struct sk_buff *next = skb->next;
 918
 919                         skb->next = NULL;
 920                         sk->sk_backlog_rcv(sk, skb);
 921                         skb = next;
 922                 } while (skb != NULL);
 923
 924                 bh_lock_sock(sk);
 925         } while((skb = sk->sk_backlog.head) != NULL);
 926 }
 927
 928 /**
 929  * sk_wait_data - wait for data to arrive at sk_receive_queue
 930  * sk - sock to wait on
 931  * timeo - for how long
 932  *
 933  * Now socket state including sk->sk_err is changed only under lock,
 934  * hence we may omit checks after joining wait queue.
 935  * We check receive queue before schedule() only as optimization;
 936  * it is very likely that release_sock() added new data.
 937  */
 938 int sk_wait_data(struct sock *sk, long *timeo)
 939 {
 940         int rc;
 941         DEFINE_WAIT(wait);
 942
 943         prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
 944         set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
 945         rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue));
 946         clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
 947         finish_wait(sk->sk_sleep, &wait);
 948         return rc;
 949 }
 950
 951 EXPORT_SYMBOL(sk_wait_data);
 952
 953 /*
 954  * Set of default routines for initialising struct proto_ops when
 955  * the protocol does not support a particular function. In certain
 956  * cases where it makes no sense for a protocol to have a "do nothing"
 957  * function, some default processing is provided.
 958  */
 959
 960 int sock_no_release(struct socket *sock)
 961 {
 962         return 0;
 963 }
 964
 965 int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
 966 {
 967         return -EOPNOTSUPP;
 968 }
 969
 970 int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
 971                     int len, int flags)
 972 {
 973         return -EOPNOTSUPP;
 974 }
 975
 976 int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
 977 {
 978         return -EOPNOTSUPP;
 979 }
 980
 981 int sock_no_accept(struct socket *sock, struct socket *newsock, int flags)
 982 {
 983         return -EOPNOTSUPP;
 984 }
 985
 986 int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
 987                     int *len, int peer)
 988 {
 989         return -EOPNOTSUPP;
 990 }
 991
 992 unsigned int sock_no_poll(struct file * file, struct socket *sock, poll_table *pt)
 993 {
 994         return 0;
 995 }
 996
 997 int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 998 {
 999         return -EOPNOTSUPP;
1000 }
1001
1002 int sock_no_listen(struct socket *sock, int backlog)
1003 {
1004         return -EOPNOTSUPP;
1005 }
1006
1007 int sock_no_shutdown(struct socket *sock, int how)
1008 {
1009         return -EOPNOTSUPP;
1010 }
1011
1012 int sock_no_setsockopt(struct socket *sock, int level, int optname,
1013                     char __user *optval, int optlen)
1014 {
1015         return -EOPNOTSUPP;
1016 }
1017
1018 int sock_no_getsockopt(struct socket *sock, int level, int optname,
1019                     char __user *optval, int __user *optlen)
1020 {
1021         return -EOPNOTSUPP;
1022 }
1023
1024 int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
1025                     size_t len)
1026 {
1027         return -EOPNOTSUPP;
1028 }
1029
1030 int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
1031                     size_t len, int flags)
1032 {
1033         return -EOPNOTSUPP;
1034 }
1035
1036 int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
1037 {
1038         /* Mirror missing mmap method error code */
1039         return -ENODEV;
1040 }
1041
1042 ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
1043 {
1044         ssize_t res;
1045         struct msghdr msg;
1046         struct iovec iov;
1047         mm_segment_t old_fs;
1048         char *kaddr;
1049
1050         kaddr = kmap(page);
1051
1052         msg.msg_name = NULL;
1053         msg.msg_namelen = 0;
1054         msg.msg_iov = &iov;
1055         msg.msg_iovlen = 1;
1056         msg.msg_control = NULL;
1057         msg.msg_controllen = 0;
1058         msg.msg_flags = flags;
1059
1060         /* This cast is ok because of the "set_fs(KERNEL_DS)" */
1061         iov.iov_base = (void __user *) (kaddr + offset);
1062         iov.iov_len = size;
1063
1064         old_fs = get_fs();
1065         set_fs(KERNEL_DS);
1066         res = sock_sendmsg(sock, &msg, size);
1067         set_fs(old_fs);
1068
1069         kunmap(page);
1070         return res;
1071 }
1072
1073 /*
1074  *      Default Socket Callbacks
1075  */
1076
1077 void sock_def_wakeup(struct sock *sk)
1078 {
1079         read_lock(&sk->sk_callback_lock);
1080         if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
1081                 wake_up_interruptible_all(sk->sk_sleep);
1082         read_unlock(&sk->sk_callback_lock);
1083 }
1084
1085 void sock_def_error_report(struct sock *sk)
1086 {
1087         read_lock(&sk->sk_callback_lock);
1088         if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
1089                 wake_up_interruptible(sk->sk_sleep);
1090         sk_wake_async(sk,0,POLL_ERR);
1091         read_unlock(&sk->sk_callback_lock);
1092 }
1093
1094 void sock_def_readable(struct sock *sk, int len)
1095 {
1096         read_lock(&sk->sk_callback_lock);
1097         if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
1098                 wake_up_interruptible(sk->sk_sleep);
1099         sk_wake_async(sk,1,POLL_IN);
1100         read_unlock(&sk->sk_callback_lock);
1101 }
1102
1103 void sock_def_write_space(struct sock *sk)
1104 {
1105         read_lock(&sk->sk_callback_lock);
1106
1107         /* Do not wake up a writer until he can make "significant"
1108          * progress.  --DaveM
1109          */
1110         if((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) {
1111                 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
1112                         wake_up_interruptible(sk->sk_sleep);
1113
1114                 /* Should agree with poll, otherwise some programs break */
1115                 if (sock_writeable(sk))
1116                         sk_wake_async(sk, 2, POLL_OUT);
1117         }
1118
1119         read_unlock(&sk->sk_callback_lock);
1120 }
1121
1122 void sock_def_destruct(struct sock *sk)
1123 {
1124         if (sk->sk_protinfo)
1125                 kfree(sk->sk_protinfo);
1126 }
1127
1128 void sk_send_sigurg(struct sock *sk)
1129 {
1130         if (sk->sk_socket && sk->sk_socket->file)
1131                 if (send_sigurg(&sk->sk_socket->file->f_owner))
1132                         sk_wake_async(sk, 3, POLL_PRI);
1133 }
1134
1135 void sk_reset_timer(struct sock *sk, struct timer_list* timer,
1136                     unsigned long expires)
1137 {
1138         if (!mod_timer(timer, expires))
1139                 sock_hold(sk);
1140 }
1141
1142 EXPORT_SYMBOL(sk_reset_timer);
1143
1144 void sk_stop_timer(struct sock *sk, struct timer_list* timer)
1145 {
1146         if (timer_pending(timer) && del_timer(timer))
1147                 __sock_put(sk);
1148 }
1149
1150 EXPORT_SYMBOL(sk_stop_timer);
1151
1152 void sock_init_data(struct socket *sock, struct sock *sk)
1153 {
1154         skb_queue_head_init(&sk->sk_receive_queue);
1155         skb_queue_head_init(&sk->sk_write_queue);
1156         skb_queue_head_init(&sk->sk_error_queue);
1157
1158         init_timer(&sk->sk_timer);
1159
1160         sk->sk_allocation       =       GFP_KERNEL;
1161         sk->sk_rcvbuf           =       sysctl_rmem_default;
1162         sk->sk_sndbuf           =       sysctl_wmem_default;
1163         sk->sk_state            =       TCP_CLOSE;
1164         sk->sk_zapped           =       1;
1165         sk->sk_socket           =       sock;
1166
1167         if(sock)
1168         {
1169                 sk->sk_type     =       sock->type;
1170                 sk->sk_sleep    =       &sock->wait;
1171                 sock->sk        =       sk;
1172         } else
1173                 sk->sk_sleep    =       NULL;
1174
1175         sk->sk_dst_lock         =       RW_LOCK_UNLOCKED;
1176         sk->sk_callback_lock    =       RW_LOCK_UNLOCKED;
1177
1178         sk->sk_state_change     =       sock_def_wakeup;
1179         sk->sk_data_ready       =       sock_def_readable;
1180         sk->sk_write_space      =       sock_def_write_space;
1181         sk->sk_error_report     =       sock_def_error_report;
1182         sk->sk_destruct         =       sock_def_destruct;
1183
1184         sk->sk_peercred.pid     =       0;
1185         sk->sk_peercred.uid     =       -1;
1186         sk->sk_peercred.gid     =       -1;
1187         sk->sk_rcvlowat         =       1;
1188         sk->sk_rcvtimeo         =       MAX_SCHEDULE_TIMEOUT;
1189         sk->sk_sndtimeo         =       MAX_SCHEDULE_TIMEOUT;
1190         sk->sk_owner            =       NULL;
1191
1192         sk->sk_stamp.tv_sec     = -1L;
1193         sk->sk_stamp.tv_usec    = -1L;
1194
1195         sk->sk_vx_info          =       NULL;
1196         sk->sk_xid              =       0;
1197         sk->sk_nx_info          =       NULL;
1198         sk->sk_nid              =       0;
1199
1200         atomic_set(&sk->sk_refcnt, 1);
1201 }
1202
1203 void fastcall lock_sock(struct sock *sk)
1204 {
1205         might_sleep();
1206         spin_lock_bh(&(sk->sk_lock.slock));
1207         if (sk->sk_lock.owner)
1208                 __lock_sock(sk);
1209         sk->sk_lock.owner = (void *)1;
1210         spin_unlock_bh(&(sk->sk_lock.slock));
1211 }
1212
1213 EXPORT_SYMBOL(lock_sock);
1214
1215 void fastcall release_sock(struct sock *sk)
1216 {
1217         spin_lock_bh(&(sk->sk_lock.slock));
1218         if (sk->sk_backlog.tail)
1219                 __release_sock(sk);
1220         sk->sk_lock.owner = NULL;
1221         if (waitqueue_active(&(sk->sk_lock.wq)))
1222                 wake_up(&(sk->sk_lock.wq));
1223         spin_unlock_bh(&(sk->sk_lock.slock));
1224 }
1225 EXPORT_SYMBOL(release_sock);
1226
1227 /* When > 0 there are consumers of rx skb time stamps */
1228 atomic_t netstamp_needed = ATOMIC_INIT(0);
1229
1230 int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
1231 {
1232         if (!sock_flag(sk, SOCK_TIMESTAMP))
1233                 sock_enable_timestamp(sk);
1234         if (sk->sk_stamp.tv_sec == -1)
1235                 return -ENOENT;
1236         if (sk->sk_stamp.tv_sec == 0)
1237                 do_gettimeofday(&sk->sk_stamp);
1238         return copy_to_user(userstamp, &sk->sk_stamp, sizeof(struct timeval)) ?
1239                 -EFAULT : 0;
1240 }
1241 EXPORT_SYMBOL(sock_get_timestamp);
1242
1243 void sock_enable_timestamp(struct sock *sk)
1244 {
1245         if (!sock_flag(sk, SOCK_TIMESTAMP)) {
1246                 sock_set_flag(sk, SOCK_TIMESTAMP);
1247                 atomic_inc(&netstamp_needed);
1248         }
1249 }
1250 EXPORT_SYMBOL(sock_enable_timestamp);
1251
1252 void sock_disable_timestamp(struct sock *sk)
1253 {
1254         if (sock_flag(sk, SOCK_TIMESTAMP)) {
1255                 sock_reset_flag(sk, SOCK_TIMESTAMP);
1256                 atomic_dec(&netstamp_needed);
1257         }
1258 }
1259 EXPORT_SYMBOL(sock_disable_timestamp);
1260
1261 EXPORT_SYMBOL(__lock_sock);
1262 EXPORT_SYMBOL(__release_sock);
1263 EXPORT_SYMBOL(sk_alloc);
1264 EXPORT_SYMBOL(sk_free);
1265 EXPORT_SYMBOL(sk_send_sigurg);
1266 EXPORT_SYMBOL(sock_alloc_send_pskb);
1267 EXPORT_SYMBOL(sock_alloc_send_skb);
1268 EXPORT_SYMBOL(sock_getsockopt);
1269 EXPORT_SYMBOL(sock_init_data);
1270 EXPORT_SYMBOL(sock_kfree_s);
1271 EXPORT_SYMBOL(sock_kmalloc);
1272 EXPORT_SYMBOL(sock_no_accept);
1273 EXPORT_SYMBOL(sock_no_bind);
1274 EXPORT_SYMBOL(sock_no_connect);
1275 EXPORT_SYMBOL(sock_no_getname);
1276 EXPORT_SYMBOL(sock_no_getsockopt);
1277 EXPORT_SYMBOL(sock_no_ioctl);
1278 EXPORT_SYMBOL(sock_no_listen);
1279 EXPORT_SYMBOL(sock_no_mmap);
1280 EXPORT_SYMBOL(sock_no_poll);
1281 EXPORT_SYMBOL(sock_no_recvmsg);
1282 EXPORT_SYMBOL(sock_no_release);
1283 EXPORT_SYMBOL(sock_no_sendmsg);
1284 EXPORT_SYMBOL(sock_no_sendpage);
1285 EXPORT_SYMBOL(sock_no_setsockopt);
1286 EXPORT_SYMBOL(sock_no_shutdown);
1287 EXPORT_SYMBOL(sock_no_socketpair);
1288 EXPORT_SYMBOL(sock_rfree);
1289 EXPORT_SYMBOL(sock_rmalloc);
1290 EXPORT_SYMBOL(sock_setsockopt);
1291 EXPORT_SYMBOL(sock_wfree);
1292 EXPORT_SYMBOL(sock_wmalloc);
1293 #ifdef CONFIG_SYSCTL
1294 EXPORT_SYMBOL(sysctl_optmem_max);
1295 EXPORT_SYMBOL(sysctl_rmem_max);
1296 EXPORT_SYMBOL(sysctl_wmem_max);
1297 #endif