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 <net/xfrm.h>
 122 #include <linux/ipsec.h>
 123
 124 #include <linux/filter.h>
 125 #include <linux/vs_socket.h>
 126 #include <linux/vs_limit.h>
 127 #include <linux/vs_context.h>
 128
 129 #ifdef CONFIG_INET
 130 #include <net/tcp.h>
 131 #endif
 132
 133 /* Take into consideration the size of the struct sk_buff overhead in the
 134  * determination of these values, since that is non-constant across
 135  * platforms.  This makes socket queueing behavior and performance
 136  * not depend upon such differences.
 137  */
 138 #define _SK_MEM_PACKETS         256
 139 #define _SK_MEM_OVERHEAD        (sizeof(struct sk_buff) + 256)
 140 #define SK_WMEM_MAX             (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
 141 #define SK_RMEM_MAX             (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
 142
 143 /* Run time adjustable parameters. */
 144 __u32 sysctl_wmem_max = SK_WMEM_MAX;
 145 __u32 sysctl_rmem_max = SK_RMEM_MAX;
 146 __u32 sysctl_wmem_default = SK_WMEM_MAX;
 147 __u32 sysctl_rmem_default = SK_RMEM_MAX;
 148
 149 /* Maximal space eaten by iovec or ancilliary data plus some space */
 150 int sysctl_optmem_max = sizeof(unsigned long)*(2*UIO_MAXIOV + 512);
 151
 152 static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen)
 153 {
 154         struct timeval tv;
 155
 156         if (optlen < sizeof(tv))
 157                 return -EINVAL;
 158         if (copy_from_user(&tv, optval, sizeof(tv)))
 159                 return -EFAULT;
 160
 161         *timeo_p = MAX_SCHEDULE_TIMEOUT;
 162         if (tv.tv_sec == 0 && tv.tv_usec == 0)
 163                 return 0;
 164         if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1))
 165                 *timeo_p = tv.tv_sec*HZ + (tv.tv_usec+(1000000/HZ-1))/(1000000/HZ);
 166         return 0;
 167 }
 168
 169 static void sock_warn_obsolete_bsdism(const char *name)
 170 {
 171         static int warned;
 172         static char warncomm[TASK_COMM_LEN];
 173         if (strcmp(warncomm, current->comm) && warned < 5) {
 174                 strcpy(warncomm,  current->comm);
 175                 printk(KERN_WARNING "process `%s' is using obsolete "
 176                        "%s SO_BSDCOMPAT\n", warncomm, name);
 177                 warned++;
 178         }
 179 }
 180
 181 static void sock_disable_timestamp(struct sock *sk)
 182 {
 183         if (sock_flag(sk, SOCK_TIMESTAMP)) {
 184                 sock_reset_flag(sk, SOCK_TIMESTAMP);
 185                 net_disable_timestamp();
 186         }
 187 }
 188
 189
 190 /*
 191  *      This is meant for all protocols to use and covers goings on
 192  *      at the socket level. Everything here is generic.
 193  */
 194
 195 int sock_setsockopt(struct socket *sock, int level, int optname,
 196                     char __user *optval, int optlen)
 197 {
 198         struct sock *sk=sock->sk;
 199         struct sk_filter *filter;
 200         int val;
 201         int valbool;
 202         struct linger ling;
 203         int ret = 0;
 204
 205         /*
 206          *      Options without arguments
 207          */
 208
 209 #ifdef SO_DONTLINGER            /* Compatibility item... */
 210         switch (optname) {
 211                 case SO_DONTLINGER:
 212                         sock_reset_flag(sk, SOCK_LINGER);
 213                         return 0;
 214         }
 215 #endif
 216
 217         if(optlen<sizeof(int))
 218                 return(-EINVAL);
 219
 220         if (get_user(val, (int __user *)optval))
 221                 return -EFAULT;
 222
 223         valbool = val?1:0;
 224
 225         lock_sock(sk);
 226
 227         switch(optname)
 228         {
 229                 case SO_DEBUG:
 230                         if(val && !capable(CAP_NET_ADMIN))
 231                         {
 232                                 ret = -EACCES;
 233                         }
 234                         else
 235                                 sk->sk_debug = valbool;
 236                         break;
 237                 case SO_REUSEADDR:
 238                         sk->sk_reuse = valbool;
 239                         break;
 240                 case SO_TYPE:
 241                 case SO_ERROR:
 242                         ret = -ENOPROTOOPT;
 243                         break;
 244                 case SO_DONTROUTE:
 245                         sk->sk_localroute = valbool;
 246                         break;
 247                 case SO_BROADCAST:
 248                         sock_valbool_flag(sk, SOCK_BROADCAST, valbool);
 249                         break;
 250                 case SO_SNDBUF:
 251                         /* Don't error on this BSD doesn't and if you think
 252                            about it this is right. Otherwise apps have to
 253                            play 'guess the biggest size' games. RCVBUF/SNDBUF
 254                            are treated in BSD as hints */
 255
 256                         if (val > sysctl_wmem_max)
 257                                 val = sysctl_wmem_max;
 258
 259                         sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
 260                         if ((val * 2) < SOCK_MIN_SNDBUF)
 261                                 sk->sk_sndbuf = SOCK_MIN_SNDBUF;
 262                         else
 263                                 sk->sk_sndbuf = val * 2;
 264
 265                         /*
 266                          *      Wake up sending tasks if we
 267                          *      upped the value.
 268                          */
 269                         sk->sk_write_space(sk);
 270                         break;
 271
 272                 case SO_RCVBUF:
 273                         /* Don't error on this BSD doesn't and if you think
 274                            about it this is right. Otherwise apps have to
 275                            play 'guess the biggest size' games. RCVBUF/SNDBUF
 276                            are treated in BSD as hints */
 277
 278                         if (val > sysctl_rmem_max)
 279                                 val = sysctl_rmem_max;
 280
 281                         sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
 282                         /* FIXME: is this lower bound the right one? */
 283                         if ((val * 2) < SOCK_MIN_RCVBUF)
 284                                 sk->sk_rcvbuf = SOCK_MIN_RCVBUF;
 285                         else
 286                                 sk->sk_rcvbuf = val * 2;
 287                         break;
 288
 289                 case SO_KEEPALIVE:
 290 #ifdef CONFIG_INET
 291                         if (sk->sk_protocol == IPPROTO_TCP)
 292                                 tcp_set_keepalive(sk, valbool);
 293 #endif
 294                         sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool);
 295                         break;
 296
 297                 case SO_OOBINLINE:
 298                         sock_valbool_flag(sk, SOCK_URGINLINE, valbool);
 299                         break;
 300
 301                 case SO_NO_CHECK:
 302                         sk->sk_no_check = valbool;
 303                         break;
 304
 305                 case SO_PRIORITY:
 306                         if ((val >= 0 && val <= 6) || capable(CAP_NET_ADMIN))
 307                                 sk->sk_priority = val;
 308                         else
 309                                 ret = -EPERM;
 310                         break;
 311
 312                 case SO_LINGER:
 313                         if(optlen<sizeof(ling)) {
 314                                 ret = -EINVAL;  /* 1003.1g */
 315                                 break;
 316                         }
 317                         if (copy_from_user(&ling,optval,sizeof(ling))) {
 318                                 ret = -EFAULT;
 319                                 break;
 320                         }
 321                         if (!ling.l_onoff)
 322                                 sock_reset_flag(sk, SOCK_LINGER);
 323                         else {
 324 #if (BITS_PER_LONG == 32)
 325                                 if (ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ)
 326                                         sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT;
 327                                 else
 328 #endif
 329                                         sk->sk_lingertime = ling.l_linger * HZ;
 330                                 sock_set_flag(sk, SOCK_LINGER);
 331                         }
 332                         break;
 333
 334                 case SO_BSDCOMPAT:
 335                         sock_warn_obsolete_bsdism("setsockopt");
 336                         break;
 337
 338                 case SO_PASSCRED:
 339                         if (valbool)
 340                                 set_bit(SOCK_PASS_CRED, &sock->flags);
 341                         else
 342                                 clear_bit(SOCK_PASS_CRED, &sock->flags);
 343                         break;
 344
 345                 case SO_TIMESTAMP:
 346                         sk->sk_rcvtstamp = valbool;
 347                         if (valbool)
 348                                 sock_enable_timestamp(sk);
 349                         break;
 350
 351                 case SO_RCVLOWAT:
 352                         if (val < 0)
 353                                 val = INT_MAX;
 354                         sk->sk_rcvlowat = val ? : 1;
 355                         break;
 356
 357                 case SO_RCVTIMEO:
 358                         ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen);
 359                         break;
 360
 361                 case SO_SNDTIMEO:
 362                         ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen);
 363                         break;
 364
 365 #ifdef CONFIG_NETDEVICES
 366                 case SO_BINDTODEVICE:
 367                 {
 368                         char devname[IFNAMSIZ];
 369
 370                         /* Sorry... */
 371                         if (!capable(CAP_NET_RAW)) {
 372                                 ret = -EPERM;
 373                                 break;
 374                         }
 375
 376                         /* Bind this socket to a particular device like "eth0",
 377                          * as specified in the passed interface name. If the
 378                          * name is "" or the option length is zero the socket
 379                          * is not bound.
 380                          */
 381
 382                         if (!valbool) {
 383                                 sk->sk_bound_dev_if = 0;
 384                         } else {
 385                                 if (optlen > IFNAMSIZ)
 386                                         optlen = IFNAMSIZ;
 387                                 if (copy_from_user(devname, optval, optlen)) {
 388                                         ret = -EFAULT;
 389                                         break;
 390                                 }
 391
 392                                 /* Remove any cached route for this socket. */
 393                                 sk_dst_reset(sk);
 394
 395                                 if (devname[0] == '\0') {
 396                                         sk->sk_bound_dev_if = 0;
 397                                 } else {
 398                                         struct net_device *dev = dev_get_by_name(devname);
 399                                         if (!dev) {
 400                                                 ret = -ENODEV;
 401                                                 break;
 402                                         }
 403                                         sk->sk_bound_dev_if = dev->ifindex;
 404                                         dev_put(dev);
 405                                 }
 406                         }
 407                         break;
 408                 }
 409 #endif
 410
 411
 412                 case SO_ATTACH_FILTER:
 413                         ret = -EINVAL;
 414                         if (optlen == sizeof(struct sock_fprog)) {
 415                                 struct sock_fprog fprog;
 416
 417                                 ret = -EFAULT;
 418                                 if (copy_from_user(&fprog, optval, sizeof(fprog)))
 419                                         break;
 420
 421                                 ret = sk_attach_filter(&fprog, sk);
 422                         }
 423                         break;
 424
 425                 case SO_DETACH_FILTER:
 426                         spin_lock_bh(&sk->sk_lock.slock);
 427                         filter = sk->sk_filter;
 428                         if (filter) {
 429                                 sk->sk_filter = NULL;
 430                                 spin_unlock_bh(&sk->sk_lock.slock);
 431                                 sk_filter_release(sk, filter);
 432                                 break;
 433                         }
 434                         spin_unlock_bh(&sk->sk_lock.slock);
 435                         ret = -ENONET;
 436                         break;
 437
 438                 /* We implement the SO_SNDLOWAT etc to
 439                    not be settable (1003.1g 5.3) */
 440                 default:
 441                         ret = -ENOPROTOOPT;
 442                         break;
 443         }
 444         release_sock(sk);
 445         return ret;
 446 }
 447
 448
 449 int sock_getsockopt(struct socket *sock, int level, int optname,
 450                     char __user *optval, int __user *optlen)
 451 {
 452         struct sock *sk = sock->sk;
 453
 454         union
 455         {
 456                 int val;
 457                 struct linger ling;
 458                 struct timeval tm;
 459         } v;
 460
 461         unsigned int lv = sizeof(int);
 462         int len;
 463
 464         if(get_user(len,optlen))
 465                 return -EFAULT;
 466         if(len < 0)
 467                 return -EINVAL;
 468
 469         switch(optname)
 470         {
 471                 case SO_DEBUG:
 472                         v.val = sk->sk_debug;
 473                         break;
 474
 475                 case SO_DONTROUTE:
 476                         v.val = sk->sk_localroute;
 477                         break;
 478
 479                 case SO_BROADCAST:
 480                         v.val = !!sock_flag(sk, SOCK_BROADCAST);
 481                         break;
 482
 483                 case SO_SNDBUF:
 484                         v.val = sk->sk_sndbuf;
 485                         break;
 486
 487                 case SO_RCVBUF:
 488                         v.val = sk->sk_rcvbuf;
 489                         break;
 490
 491                 case SO_REUSEADDR:
 492                         v.val = sk->sk_reuse;
 493                         break;
 494
 495                 case SO_KEEPALIVE:
 496                         v.val = !!sock_flag(sk, SOCK_KEEPOPEN);
 497                         break;
 498
 499                 case SO_TYPE:
 500                         v.val = sk->sk_type;
 501                         break;
 502
 503                 case SO_ERROR:
 504                         v.val = -sock_error(sk);
 505                         if(v.val==0)
 506                                 v.val = xchg(&sk->sk_err_soft, 0);
 507                         break;
 508
 509                 case SO_OOBINLINE:
 510                         v.val = !!sock_flag(sk, SOCK_URGINLINE);
 511                         break;
 512
 513                 case SO_NO_CHECK:
 514                         v.val = sk->sk_no_check;
 515                         break;
 516
 517                 case SO_PRIORITY:
 518                         v.val = sk->sk_priority;
 519                         break;
 520
 521                 case SO_LINGER:
 522                         lv              = sizeof(v.ling);
 523                         v.ling.l_onoff  = !!sock_flag(sk, SOCK_LINGER);
 524                         v.ling.l_linger = sk->sk_lingertime / HZ;
 525                         break;
 526
 527                 case SO_BSDCOMPAT:
 528                         sock_warn_obsolete_bsdism("getsockopt");
 529                         break;
 530
 531                 case SO_TIMESTAMP:
 532                         v.val = sk->sk_rcvtstamp;
 533                         break;
 534
 535                 case SO_RCVTIMEO:
 536                         lv=sizeof(struct timeval);
 537                         if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) {
 538                                 v.tm.tv_sec = 0;
 539                                 v.tm.tv_usec = 0;
 540                         } else {
 541                                 v.tm.tv_sec = sk->sk_rcvtimeo / HZ;
 542                                 v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ;
 543                         }
 544                         break;
 545
 546                 case SO_SNDTIMEO:
 547                         lv=sizeof(struct timeval);
 548                         if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) {
 549                                 v.tm.tv_sec = 0;
 550                                 v.tm.tv_usec = 0;
 551                         } else {
 552                                 v.tm.tv_sec = sk->sk_sndtimeo / HZ;
 553                                 v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ;
 554                         }
 555                         break;
 556
 557                 case SO_RCVLOWAT:
 558                         v.val = sk->sk_rcvlowat;
 559                         break;
 560
 561                 case SO_SNDLOWAT:
 562                         v.val=1;
 563                         break;
 564
 565                 case SO_PASSCRED:
 566                         v.val = test_bit(SOCK_PASS_CRED, &sock->flags)?1:0;
 567                         break;
 568
 569                 case SO_PEERCRED:
 570                         if (len > sizeof(sk->sk_peercred))
 571                                 len = sizeof(sk->sk_peercred);
 572                         if (copy_to_user(optval, &sk->sk_peercred, len))
 573                                 return -EFAULT;
 574                         goto lenout;
 575
 576                 case SO_PEERNAME:
 577                 {
 578                         char address[128];
 579
 580                         if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2))
 581                                 return -ENOTCONN;
 582                         if (lv < len)
 583                                 return -EINVAL;
 584                         if (copy_to_user(optval, address, len))
 585                                 return -EFAULT;
 586                         goto lenout;
 587                 }
 588
 589                 /* Dubious BSD thing... Probably nobody even uses it, but
 590                  * the UNIX standard wants it for whatever reason... -DaveM
 591                  */
 592                 case SO_ACCEPTCONN:
 593                         v.val = sk->sk_state == TCP_LISTEN;
 594                         break;
 595
 596                 case SO_PEERSEC:
 597                         return security_socket_getpeersec(sock, optval, optlen, len);
 598
 599                 default:
 600                         return(-ENOPROTOOPT);
 601         }
 602         if (len > lv)
 603                 len = lv;
 604         if (copy_to_user(optval, &v, len))
 605                 return -EFAULT;
 606 lenout:
 607         if (put_user(len, optlen))
 608                 return -EFAULT;
 609         return 0;
 610 }
 611
 612 static kmem_cache_t *sk_cachep;
 613
 614 /**
 615  *      sk_alloc - All socket objects are allocated here
 616  *      @family - protocol family
 617  *      @priority - for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
 618  *      @zero_it - zeroes the allocated sock
 619  *      @slab - alternate slab
 620  *
 621  *      All socket objects are allocated here. If @zero_it is non-zero
 622  *      it should have the size of the are to be zeroed, because the
 623  *      private slabcaches have different sizes of the generic struct sock.
 624  *      1 has been kept as a way to say sizeof(struct sock).
 625  */
 626 struct sock *sk_alloc(int family, int priority, int zero_it, kmem_cache_t *slab)
 627 {
 628         struct sock *sk = NULL;
 629
 630         if (!slab)
 631                 slab = sk_cachep;
 632         sk = kmem_cache_alloc(slab, priority);
 633         if (sk) {
 634                 if (zero_it) {
 635                         memset(sk, 0,
 636                                zero_it == 1 ? sizeof(struct sock) : zero_it);
 637                         sk->sk_family = family;
 638                         sock_lock_init(sk);
 639                 }
 640                 sk->sk_slab = slab;
 641                 sock_vx_init(sk);
 642                 sock_nx_init(sk);
 643
 644                 if (security_sk_alloc(sk, family, priority)) {
 645                         kmem_cache_free(slab, sk);
 646                         sk = NULL;
 647                 }
 648         }
 649         return sk;
 650 }
 651
 652 void sk_free(struct sock *sk)
 653 {
 654         struct sk_filter *filter;
 655         struct module *owner = sk->sk_owner;
 656
 657         if (sk->sk_destruct)
 658                 sk->sk_destruct(sk);
 659
 660         filter = sk->sk_filter;
 661         if (filter) {
 662                 sk_filter_release(sk, filter);
 663                 sk->sk_filter = NULL;
 664         }
 665
 666         sock_disable_timestamp(sk);
 667
 668         if (atomic_read(&sk->sk_omem_alloc))
 669                 printk(KERN_DEBUG "%s: optmem leakage (%d bytes) detected.\n",
 670                        __FUNCTION__, atomic_read(&sk->sk_omem_alloc));
 671
 672         security_sk_free(sk);
 673         vx_sock_dec(sk);
 674         // BUG_ON(sk->sk_vx_info);
 675         clr_vx_info(&sk->sk_vx_info);
 676         sk->sk_xid = -1;
 677         // BUG_ON(sk->sk_nx_info);
 678         clr_nx_info(&sk->sk_nx_info);
 679         sk->sk_nid = -1;
 680         kmem_cache_free(sk->sk_slab, sk);
 681         module_put(owner);
 682 }
 683
 684 void __init sk_init(void)
 685 {
 686         sk_cachep = kmem_cache_create("sock", sizeof(struct sock), 0,
 687                                       SLAB_HWCACHE_ALIGN, NULL, NULL);
 688         if (!sk_cachep)
 689                 printk(KERN_CRIT "sk_init: Cannot create sock SLAB cache!");
 690
 691         if (num_physpages <= 4096) {
 692                 sysctl_wmem_max = 32767;
 693                 sysctl_rmem_max = 32767;
 694                 sysctl_wmem_default = 32767;
 695                 sysctl_rmem_default = 32767;
 696         } else if (num_physpages >= 131072) {
 697                 sysctl_wmem_max = 131071;
 698                 sysctl_rmem_max = 131071;
 699         }
 700 }
 701
 702 /*
 703  *      Simple resource managers for sockets.
 704  */
 705
 706
 707 /*
 708  * Write buffer destructor automatically called from kfree_skb.
 709  */
 710 void sock_wfree(struct sk_buff *skb)
 711 {
 712         struct sock *sk = skb->sk;
 713
 714         /* In case it might be waiting for more memory. */
 715         atomic_sub(skb->truesize, &sk->sk_wmem_alloc);
 716         if (!sk->sk_use_write_queue)
 717                 sk->sk_write_space(sk);
 718         sock_put(sk);
 719 }
 720
 721 /*
 722  * Read buffer destructor automatically called from kfree_skb.
 723  */
 724 void sock_rfree(struct sk_buff *skb)
 725 {
 726         struct sock *sk = skb->sk;
 727
 728         atomic_sub(skb->truesize, &sk->sk_rmem_alloc);
 729 }
 730
 731
 732 int sock_i_uid(struct sock *sk)
 733 {
 734         int uid;
 735
 736         read_lock(&sk->sk_callback_lock);
 737         uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : 0;
 738         read_unlock(&sk->sk_callback_lock);
 739         return uid;
 740 }
 741
 742 unsigned long sock_i_ino(struct sock *sk)
 743 {
 744         unsigned long ino;
 745
 746         read_lock(&sk->sk_callback_lock);
 747         ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
 748         read_unlock(&sk->sk_callback_lock);
 749         return ino;
 750 }
 751
 752 /*
 753  * Allocate a skb from the socket's send buffer.
 754  */
 755 struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force, int priority)
 756 {
 757         if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
 758                 struct sk_buff * skb = alloc_skb(size, priority);
 759                 if (skb) {
 760                         skb_set_owner_w(skb, sk);
 761                         return skb;
 762                 }
 763         }
 764         return NULL;
 765 }
 766
 767 /*
 768  * Allocate a skb from the socket's receive buffer.
 769  */
 770 struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force, int priority)
 771 {
 772         if (force || atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) {
 773                 struct sk_buff *skb = alloc_skb(size, priority);
 774                 if (skb) {
 775                         skb_set_owner_r(skb, sk);
 776                         return skb;
 777                 }
 778         }
 779         return NULL;
 780 }
 781
 782 /*
 783  * Allocate a memory block from the socket's option memory buffer.
 784  */
 785 void *sock_kmalloc(struct sock *sk, int size, int priority)
 786 {
 787         if ((unsigned)size <= sysctl_optmem_max &&
 788             atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) {
 789                 void *mem;
 790                 /* First do the add, to avoid the race if kmalloc
 791                  * might sleep.
 792                  */
 793                 atomic_add(size, &sk->sk_omem_alloc);
 794                 mem = kmalloc(size, priority);
 795                 if (mem)
 796                         return mem;
 797                 atomic_sub(size, &sk->sk_omem_alloc);
 798         }
 799         return NULL;
 800 }
 801
 802 /*
 803  * Free an option memory block.
 804  */
 805 void sock_kfree_s(struct sock *sk, void *mem, int size)
 806 {
 807         kfree(mem);
 808         atomic_sub(size, &sk->sk_omem_alloc);
 809 }
 810
 811 /* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
 812    I think, these locks should be removed for datagram sockets.
 813  */
 814 static long sock_wait_for_wmem(struct sock * sk, long timeo)
 815 {
 816         DEFINE_WAIT(wait);
 817
 818         clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
 819         for (;;) {
 820                 if (!timeo)
 821                         break;
 822                 if (signal_pending(current))
 823                         break;
 824                 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
 825                 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
 826                 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf)
 827                         break;
 828                 if (sk->sk_shutdown & SEND_SHUTDOWN)
 829                         break;
 830                 if (sk->sk_err)
 831                         break;
 832                 timeo = schedule_timeout(timeo);
 833         }
 834         finish_wait(sk->sk_sleep, &wait);
 835         return timeo;
 836 }
 837
 838
 839 /*
 840  *      Generic send/receive buffer handlers
 841  */
 842
 843 static struct sk_buff *sock_alloc_send_pskb(struct sock *sk,
 844                                             unsigned long header_len,
 845                                             unsigned long data_len,
 846                                             int noblock, int *errcode)
 847 {
 848         struct sk_buff *skb;
 849         unsigned int gfp_mask;
 850         long timeo;
 851         int err;
 852
 853         gfp_mask = sk->sk_allocation;
 854         if (gfp_mask & __GFP_WAIT)
 855                 gfp_mask |= __GFP_REPEAT;
 856
 857         timeo = sock_sndtimeo(sk, noblock);
 858         while (1) {
 859                 err = sock_error(sk);
 860                 if (err != 0)
 861                         goto failure;
 862
 863                 err = -EPIPE;
 864                 if (sk->sk_shutdown & SEND_SHUTDOWN)
 865                         goto failure;
 866
 867                 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
 868                         skb = alloc_skb(header_len, sk->sk_allocation);
 869                         if (skb) {
 870                                 int npages;
 871                                 int i;
 872
 873                                 /* No pages, we're done... */
 874                                 if (!data_len)
 875                                         break;
 876
 877                                 npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
 878                                 skb->truesize += data_len;
 879                                 skb_shinfo(skb)->nr_frags = npages;
 880                                 for (i = 0; i < npages; i++) {
 881                                         struct page *page;
 882                                         skb_frag_t *frag;
 883
 884                                         page = alloc_pages(sk->sk_allocation, 0);
 885                                         if (!page) {
 886                                                 err = -ENOBUFS;
 887                                                 skb_shinfo(skb)->nr_frags = i;
 888                                                 kfree_skb(skb);
 889                                                 goto failure;
 890                                         }
 891
 892                                         frag = &skb_shinfo(skb)->frags[i];
 893                                         frag->page = page;
 894                                         frag->page_offset = 0;
 895                                         frag->size = (data_len >= PAGE_SIZE ?
 896                                                       PAGE_SIZE :
 897                                                       data_len);
 898                                         data_len -= PAGE_SIZE;
 899                                 }
 900
 901                                 /* Full success... */
 902                                 break;
 903                         }
 904                         err = -ENOBUFS;
 905                         goto failure;
 906                 }
 907                 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
 908                 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
 909                 err = -EAGAIN;
 910                 if (!timeo)
 911                         goto failure;
 912                 if (signal_pending(current))
 913                         goto interrupted;
 914                 timeo = sock_wait_for_wmem(sk, timeo);
 915         }
 916
 917         skb_set_owner_w(skb, sk);
 918         return skb;
 919
 920 interrupted:
 921         err = sock_intr_errno(timeo);
 922 failure:
 923         *errcode = err;
 924         return NULL;
 925 }
 926
 927 struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
 928                                     int noblock, int *errcode)
 929 {
 930         return sock_alloc_send_pskb(sk, size, 0, noblock, errcode);
 931 }
 932
 933 static void __lock_sock(struct sock *sk)
 934 {
 935         DEFINE_WAIT(wait);
 936
 937         for(;;) {
 938                 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
 939                                         TASK_UNINTERRUPTIBLE);
 940                 spin_unlock_bh(&sk->sk_lock.slock);
 941                 schedule();
 942                 spin_lock_bh(&sk->sk_lock.slock);
 943                 if(!sock_owned_by_user(sk))
 944                         break;
 945         }
 946         finish_wait(&sk->sk_lock.wq, &wait);
 947 }
 948
 949 static void __release_sock(struct sock *sk)
 950 {
 951         struct sk_buff *skb = sk->sk_backlog.head;
 952
 953         do {
 954                 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
 955                 bh_unlock_sock(sk);
 956
 957                 do {
 958                         struct sk_buff *next = skb->next;
 959
 960                         skb->next = NULL;
 961                         sk->sk_backlog_rcv(sk, skb);
 962
 963                         /*
 964                          * We are in process context here with softirqs
 965                          * disabled, use cond_resched_softirq() to preempt.
 966                          * This is safe to do because we've taken the backlog
 967                          * queue private:
 968                          */
 969                         cond_resched_softirq();
 970
 971                         skb = next;
 972                 } while (skb != NULL);
 973
 974                 bh_lock_sock(sk);
 975         } while((skb = sk->sk_backlog.head) != NULL);
 976 }
 977
 978 /**
 979  * sk_wait_data - wait for data to arrive at sk_receive_queue
 980  * sk - sock to wait on
 981  * timeo - for how long
 982  *
 983  * Now socket state including sk->sk_err is changed only under lock,
 984  * hence we may omit checks after joining wait queue.
 985  * We check receive queue before schedule() only as optimization;
 986  * it is very likely that release_sock() added new data.
 987  */
 988 int sk_wait_data(struct sock *sk, long *timeo)
 989 {
 990         int rc;
 991         DEFINE_WAIT(wait);
 992
 993         prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
 994         set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
 995         rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue));
 996         clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
 997         finish_wait(sk->sk_sleep, &wait);
 998         return rc;
 999 }
1000
1001 EXPORT_SYMBOL(sk_wait_data);
1002
1003 /*
1004  * Set of default routines for initialising struct proto_ops when
1005  * the protocol does not support a particular function. In certain
1006  * cases where it makes no sense for a protocol to have a "do nothing"
1007  * function, some default processing is provided.
1008  */
1009
1010 int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
1011 {
1012         return -EOPNOTSUPP;
1013 }
1014
1015 int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
1016                     int len, int flags)
1017 {
1018         return -EOPNOTSUPP;
1019 }
1020
1021 int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
1022 {
1023         return -EOPNOTSUPP;
1024 }
1025
1026 int sock_no_accept(struct socket *sock, struct socket *newsock, int flags)
1027 {
1028         return -EOPNOTSUPP;
1029 }
1030
1031 int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
1032                     int *len, int peer)
1033 {
1034         return -EOPNOTSUPP;
1035 }
1036
1037 unsigned int sock_no_poll(struct file * file, struct socket *sock, poll_table *pt)
1038 {
1039         return 0;
1040 }
1041
1042 int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1043 {
1044         return -EOPNOTSUPP;
1045 }
1046
1047 int sock_no_listen(struct socket *sock, int backlog)
1048 {
1049         return -EOPNOTSUPP;
1050 }
1051
1052 int sock_no_shutdown(struct socket *sock, int how)
1053 {
1054         return -EOPNOTSUPP;
1055 }
1056
1057 int sock_no_setsockopt(struct socket *sock, int level, int optname,
1058                     char __user *optval, int optlen)
1059 {
1060         return -EOPNOTSUPP;
1061 }
1062
1063 int sock_no_getsockopt(struct socket *sock, int level, int optname,
1064                     char __user *optval, int __user *optlen)
1065 {
1066         return -EOPNOTSUPP;
1067 }
1068
1069 int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
1070                     size_t len)
1071 {
1072         return -EOPNOTSUPP;
1073 }
1074
1075 int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
1076                     size_t len, int flags)
1077 {
1078         return -EOPNOTSUPP;
1079 }
1080
1081 int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
1082 {
1083         /* Mirror missing mmap method error code */
1084         return -ENODEV;
1085 }
1086
1087 ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
1088 {
1089         ssize_t res;
1090         struct msghdr msg = {.msg_flags = flags};
1091         struct kvec iov;
1092         char *kaddr = kmap(page);
1093         iov.iov_base = kaddr + offset;
1094         iov.iov_len = size;
1095         res = kernel_sendmsg(sock, &msg, &iov, 1, size);
1096         kunmap(page);
1097         return res;
1098 }
1099
1100 /*
1101  *      Default Socket Callbacks
1102  */
1103
1104 static void sock_def_wakeup(struct sock *sk)
1105 {
1106         read_lock(&sk->sk_callback_lock);
1107         if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
1108                 wake_up_interruptible_all(sk->sk_sleep);
1109         read_unlock(&sk->sk_callback_lock);
1110 }
1111
1112 static void sock_def_error_report(struct sock *sk)
1113 {
1114         read_lock(&sk->sk_callback_lock);
1115         if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
1116                 wake_up_interruptible(sk->sk_sleep);
1117         sk_wake_async(sk,0,POLL_ERR);
1118         read_unlock(&sk->sk_callback_lock);
1119 }
1120
1121 static void sock_def_readable(struct sock *sk, int len)
1122 {
1123         read_lock(&sk->sk_callback_lock);
1124         if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
1125                 wake_up_interruptible(sk->sk_sleep);
1126         sk_wake_async(sk,1,POLL_IN);
1127         read_unlock(&sk->sk_callback_lock);
1128 }
1129
1130 static void sock_def_write_space(struct sock *sk)
1131 {
1132         read_lock(&sk->sk_callback_lock);
1133
1134         /* Do not wake up a writer until he can make "significant"
1135          * progress.  --DaveM
1136          */
1137         if((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) {
1138                 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
1139                         wake_up_interruptible(sk->sk_sleep);
1140
1141                 /* Should agree with poll, otherwise some programs break */
1142                 if (sock_writeable(sk))
1143                         sk_wake_async(sk, 2, POLL_OUT);
1144         }
1145
1146         read_unlock(&sk->sk_callback_lock);
1147 }
1148
1149 static void sock_def_destruct(struct sock *sk)
1150 {
1151         if (sk->sk_protinfo)
1152                 kfree(sk->sk_protinfo);
1153 }
1154
1155 void sk_send_sigurg(struct sock *sk)
1156 {
1157         if (sk->sk_socket && sk->sk_socket->file)
1158                 if (send_sigurg(&sk->sk_socket->file->f_owner))
1159                         sk_wake_async(sk, 3, POLL_PRI);
1160 }
1161
1162 void sk_reset_timer(struct sock *sk, struct timer_list* timer,
1163                     unsigned long expires)
1164 {
1165         if (!mod_timer(timer, expires))
1166                 sock_hold(sk);
1167 }
1168
1169 EXPORT_SYMBOL(sk_reset_timer);
1170
1171 void sk_stop_timer(struct sock *sk, struct timer_list* timer)
1172 {
1173         if (timer_pending(timer) && del_timer(timer))
1174                 __sock_put(sk);
1175 }
1176
1177 EXPORT_SYMBOL(sk_stop_timer);
1178
1179 void sock_init_data(struct socket *sock, struct sock *sk)
1180 {
1181         skb_queue_head_init(&sk->sk_receive_queue);
1182         skb_queue_head_init(&sk->sk_write_queue);
1183         skb_queue_head_init(&sk->sk_error_queue);
1184
1185         sk->sk_send_head        =       NULL;
1186
1187         init_timer(&sk->sk_timer);
1188
1189         sk->sk_allocation       =       GFP_KERNEL;
1190         sk->sk_rcvbuf           =       sysctl_rmem_default;
1191         sk->sk_sndbuf           =       sysctl_wmem_default;
1192         sk->sk_state            =       TCP_CLOSE;
1193         sk->sk_zapped           =       1;
1194         sk->sk_socket           =       sock;
1195
1196         if(sock)
1197         {
1198                 sk->sk_type     =       sock->type;
1199                 sk->sk_sleep    =       &sock->wait;
1200                 sock->sk        =       sk;
1201         } else
1202                 sk->sk_sleep    =       NULL;
1203
1204         rwlock_init(&sk->sk_dst_lock);
1205         rwlock_init(&sk->sk_callback_lock);
1206
1207         sk->sk_state_change     =       sock_def_wakeup;
1208         sk->sk_data_ready       =       sock_def_readable;
1209         sk->sk_write_space      =       sock_def_write_space;
1210         sk->sk_error_report     =       sock_def_error_report;
1211         sk->sk_destruct         =       sock_def_destruct;
1212
1213         sk->sk_sndmsg_page      =       NULL;
1214         sk->sk_sndmsg_off       =       0;
1215
1216         sk->sk_peercred.pid     =       0;
1217         sk->sk_peercred.uid     =       -1;
1218         sk->sk_peercred.gid     =       -1;
1219         sk->sk_write_pending    =       0;
1220         sk->sk_rcvlowat         =       1;
1221         sk->sk_rcvtimeo         =       MAX_SCHEDULE_TIMEOUT;
1222         sk->sk_sndtimeo         =       MAX_SCHEDULE_TIMEOUT;
1223         sk->sk_owner            =       NULL;
1224
1225         sk->sk_stamp.tv_sec     = -1L;
1226         sk->sk_stamp.tv_usec    = -1L;
1227
1228         set_vx_info(&sk->sk_vx_info, current->vx_info);
1229         sk->sk_xid = vx_current_xid();
1230         vx_sock_inc(sk);
1231         set_nx_info(&sk->sk_nx_info, current->nx_info);
1232         sk->sk_nid = nx_current_nid();
1233         atomic_set(&sk->sk_refcnt, 1);
1234 }
1235
1236 void fastcall lock_sock(struct sock *sk)
1237 {
1238         might_sleep();
1239         spin_lock_bh(&(sk->sk_lock.slock));
1240         if (sk->sk_lock.owner)
1241                 __lock_sock(sk);
1242         sk->sk_lock.owner = (void *)1;
1243         spin_unlock_bh(&(sk->sk_lock.slock));
1244 }
1245
1246 EXPORT_SYMBOL(lock_sock);
1247
1248 void fastcall release_sock(struct sock *sk)
1249 {
1250         spin_lock_bh(&(sk->sk_lock.slock));
1251         if (sk->sk_backlog.tail)
1252                 __release_sock(sk);
1253         sk->sk_lock.owner = NULL;
1254         if (waitqueue_active(&(sk->sk_lock.wq)))
1255                 wake_up(&(sk->sk_lock.wq));
1256         spin_unlock_bh(&(sk->sk_lock.slock));
1257 }
1258 EXPORT_SYMBOL(release_sock);
1259
1260 int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
1261 {
1262         if (!sock_flag(sk, SOCK_TIMESTAMP))
1263                 sock_enable_timestamp(sk);
1264         if (sk->sk_stamp.tv_sec == -1)
1265                 return -ENOENT;
1266         if (sk->sk_stamp.tv_sec == 0)
1267                 do_gettimeofday(&sk->sk_stamp);
1268         return copy_to_user(userstamp, &sk->sk_stamp, sizeof(struct timeval)) ?
1269                 -EFAULT : 0;
1270 }
1271 EXPORT_SYMBOL(sock_get_timestamp);
1272
1273 void sock_enable_timestamp(struct sock *sk)
1274 {
1275         if (!sock_flag(sk, SOCK_TIMESTAMP)) {
1276                 sock_set_flag(sk, SOCK_TIMESTAMP);
1277                 net_enable_timestamp();
1278         }
1279 }
1280 EXPORT_SYMBOL(sock_enable_timestamp);
1281
1282 /*
1283  *      Get a socket option on an socket.
1284  *
1285  *      FIX: POSIX 1003.1g is very ambiguous here. It states that
1286  *      asynchronous errors should be reported by getsockopt. We assume
1287  *      this means if you specify SO_ERROR (otherwise whats the point of it).
1288  */
1289 int sock_common_getsockopt(struct socket *sock, int level, int optname,
1290                            char __user *optval, int __user *optlen)
1291 {
1292         struct sock *sk = sock->sk;
1293
1294         return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
1295 }
1296
1297 EXPORT_SYMBOL(sock_common_getsockopt);
1298
1299 int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock,
1300                         struct msghdr *msg, size_t size, int flags)
1301 {
1302         struct sock *sk = sock->sk;
1303         int addr_len = 0;
1304         int err;
1305
1306         err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT,
1307                                    flags & ~MSG_DONTWAIT, &addr_len);
1308         if (err >= 0)
1309                 msg->msg_namelen = addr_len;
1310         return err;
1311 }
1312
1313 EXPORT_SYMBOL(sock_common_recvmsg);
1314
1315 /*
1316  *      Set socket options on an inet socket.
1317  */
1318 int sock_common_setsockopt(struct socket *sock, int level, int optname,
1319                            char __user *optval, int optlen)
1320 {
1321         struct sock *sk = sock->sk;
1322
1323         return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
1324 }
1325
1326 EXPORT_SYMBOL(sock_common_setsockopt);
1327
1328 void sk_common_release(struct sock *sk)
1329 {
1330         if (sk->sk_prot->destroy)
1331                 sk->sk_prot->destroy(sk);
1332
1333         /*
1334          * Observation: when sock_common_release is called, processes have
1335          * no access to socket. But net still has.
1336          * Step one, detach it from networking:
1337          *
1338          * A. Remove from hash tables.
1339          */
1340
1341         sk->sk_prot->unhash(sk);
1342
1343         /*
1344          * In this point socket cannot receive new packets, but it is possible
1345          * that some packets are in flight because some CPU runs receiver and
1346          * did hash table lookup before we unhashed socket. They will achieve
1347          * receive queue and will be purged by socket destructor.
1348          *
1349          * Also we still have packets pending on receive queue and probably,
1350          * our own packets waiting in device queues. sock_destroy will drain
1351          * receive queue, but transmitted packets will delay socket destruction
1352          * until the last reference will be released.
1353          */
1354
1355         sock_orphan(sk);
1356
1357         xfrm_sk_free_policy(sk);
1358
1359 #ifdef INET_REFCNT_DEBUG
1360         if (atomic_read(&sk->sk_refcnt) != 1)
1361                 printk(KERN_DEBUG "Destruction of the socket %p delayed, c=%d\n",
1362                        sk, atomic_read(&sk->sk_refcnt));
1363 #endif
1364         sock_put(sk);
1365 }
1366
1367 EXPORT_SYMBOL(sk_common_release);
1368
1369 int sk_alloc_slab(struct proto *prot, char *name)
1370 {
1371         prot->slab = kmem_cache_create(name,
1372                                        prot->slab_obj_size, 0,
1373                                        SLAB_HWCACHE_ALIGN, NULL, NULL);
1374
1375         return prot->slab != NULL ? 0 : -ENOBUFS;
1376 }
1377
1378 EXPORT_SYMBOL(sk_alloc_slab);
1379
1380 void sk_free_slab(struct proto *prot)
1381 {
1382         if (prot->slab != NULL) {
1383                 kmem_cache_destroy(prot->slab);
1384                 prot->slab = NULL;
1385         }
1386 }
1387
1388 EXPORT_SYMBOL(sk_free_slab);
1389
1390 EXPORT_SYMBOL(sk_alloc);
1391 EXPORT_SYMBOL(sk_free);
1392 EXPORT_SYMBOL(sk_send_sigurg);
1393 EXPORT_SYMBOL(sock_alloc_send_skb);
1394 EXPORT_SYMBOL(sock_init_data);
1395 EXPORT_SYMBOL(sock_kfree_s);
1396 EXPORT_SYMBOL(sock_kmalloc);
1397 EXPORT_SYMBOL(sock_no_accept);
1398 EXPORT_SYMBOL(sock_no_bind);
1399 EXPORT_SYMBOL(sock_no_connect);
1400 EXPORT_SYMBOL(sock_no_getname);
1401 EXPORT_SYMBOL(sock_no_getsockopt);
1402 EXPORT_SYMBOL(sock_no_ioctl);
1403 EXPORT_SYMBOL(sock_no_listen);
1404 EXPORT_SYMBOL(sock_no_mmap);
1405 EXPORT_SYMBOL(sock_no_poll);
1406 EXPORT_SYMBOL(sock_no_recvmsg);
1407 EXPORT_SYMBOL(sock_no_sendmsg);
1408 EXPORT_SYMBOL(sock_no_sendpage);
1409 EXPORT_SYMBOL(sock_no_setsockopt);
1410 EXPORT_SYMBOL(sock_no_shutdown);
1411 EXPORT_SYMBOL(sock_no_socketpair);
1412 EXPORT_SYMBOL(sock_rfree);
1413 EXPORT_SYMBOL(sock_setsockopt);
1414 EXPORT_SYMBOL(sock_wfree);
1415 EXPORT_SYMBOL(sock_wmalloc);
1416 EXPORT_SYMBOL(sock_i_uid);
1417 EXPORT_SYMBOL(sock_i_ino);
1418 #ifdef CONFIG_SYSCTL
1419 EXPORT_SYMBOL(sysctl_optmem_max);
1420 EXPORT_SYMBOL(sysctl_rmem_max);
1421 EXPORT_SYMBOL(sysctl_wmem_max);
1422 #endif