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         clr_vx_info(&sk->sk_vx_info);
 675         sk->sk_xid = -1;
 676         clr_nx_info(&sk->sk_nx_info);
 677         sk->sk_nid = -1;
 678         kmem_cache_free(sk->sk_slab, sk);
 679         module_put(owner);
 680 }
 681
 682 void __init sk_init(void)
 683 {
 684         sk_cachep = kmem_cache_create("sock", sizeof(struct sock), 0,
 685                                       SLAB_HWCACHE_ALIGN, NULL, NULL);
 686         if (!sk_cachep)
 687                 printk(KERN_CRIT "sk_init: Cannot create sock SLAB cache!");
 688
 689         if (num_physpages <= 4096) {
 690                 sysctl_wmem_max = 32767;
 691                 sysctl_rmem_max = 32767;
 692                 sysctl_wmem_default = 32767;
 693                 sysctl_rmem_default = 32767;
 694         } else if (num_physpages >= 131072) {
 695                 sysctl_wmem_max = 131071;
 696                 sysctl_rmem_max = 131071;
 697         }
 698 }
 699
 700 /*
 701  *      Simple resource managers for sockets.
 702  */
 703
 704
 705 /*
 706  * Write buffer destructor automatically called from kfree_skb.
 707  */
 708 void sock_wfree(struct sk_buff *skb)
 709 {
 710         struct sock *sk = skb->sk;
 711
 712         /* In case it might be waiting for more memory. */
 713         atomic_sub(skb->truesize, &sk->sk_wmem_alloc);
 714         if (!sk->sk_use_write_queue)
 715                 sk->sk_write_space(sk);
 716         sock_put(sk);
 717 }
 718
 719 /*
 720  * Read buffer destructor automatically called from kfree_skb.
 721  */
 722 void sock_rfree(struct sk_buff *skb)
 723 {
 724         struct sock *sk = skb->sk;
 725
 726         atomic_sub(skb->truesize, &sk->sk_rmem_alloc);
 727 }
 728
 729
 730 int sock_i_uid(struct sock *sk)
 731 {
 732         int uid;
 733
 734         read_lock(&sk->sk_callback_lock);
 735         uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : 0;
 736         read_unlock(&sk->sk_callback_lock);
 737         return uid;
 738 }
 739
 740 unsigned long sock_i_ino(struct sock *sk)
 741 {
 742         unsigned long ino;
 743
 744         read_lock(&sk->sk_callback_lock);
 745         ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
 746         read_unlock(&sk->sk_callback_lock);
 747         return ino;
 748 }
 749
 750 /*
 751  * Allocate a skb from the socket's send buffer.
 752  */
 753 struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force, int priority)
 754 {
 755         if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
 756                 struct sk_buff * skb = alloc_skb(size, priority);
 757                 if (skb) {
 758                         skb_set_owner_w(skb, sk);
 759                         return skb;
 760                 }
 761         }
 762         return NULL;
 763 }
 764
 765 /*
 766  * Allocate a skb from the socket's receive buffer.
 767  */
 768 struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force, int priority)
 769 {
 770         if (force || atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) {
 771                 struct sk_buff *skb = alloc_skb(size, priority);
 772                 if (skb) {
 773                         skb_set_owner_r(skb, sk);
 774                         return skb;
 775                 }
 776         }
 777         return NULL;
 778 }
 779
 780 /*
 781  * Allocate a memory block from the socket's option memory buffer.
 782  */
 783 void *sock_kmalloc(struct sock *sk, int size, int priority)
 784 {
 785         if ((unsigned)size <= sysctl_optmem_max &&
 786             atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) {
 787                 void *mem;
 788                 /* First do the add, to avoid the race if kmalloc
 789                  * might sleep.
 790                  */
 791                 atomic_add(size, &sk->sk_omem_alloc);
 792                 mem = kmalloc(size, priority);
 793                 if (mem)
 794                         return mem;
 795                 atomic_sub(size, &sk->sk_omem_alloc);
 796         }
 797         return NULL;
 798 }
 799
 800 /*
 801  * Free an option memory block.
 802  */
 803 void sock_kfree_s(struct sock *sk, void *mem, int size)
 804 {
 805         kfree(mem);
 806         atomic_sub(size, &sk->sk_omem_alloc);
 807 }
 808
 809 /* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
 810    I think, these locks should be removed for datagram sockets.
 811  */
 812 static long sock_wait_for_wmem(struct sock * sk, long timeo)
 813 {
 814         DEFINE_WAIT(wait);
 815
 816         clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
 817         for (;;) {
 818                 if (!timeo)
 819                         break;
 820                 if (signal_pending(current))
 821                         break;
 822                 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
 823                 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
 824                 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf)
 825                         break;
 826                 if (sk->sk_shutdown & SEND_SHUTDOWN)
 827                         break;
 828                 if (sk->sk_err)
 829                         break;
 830                 timeo = schedule_timeout(timeo);
 831         }
 832         finish_wait(sk->sk_sleep, &wait);
 833         return timeo;
 834 }
 835
 836
 837 /*
 838  *      Generic send/receive buffer handlers
 839  */
 840
 841 static struct sk_buff *sock_alloc_send_pskb(struct sock *sk,
 842                                             unsigned long header_len,
 843                                             unsigned long data_len,
 844                                             int noblock, int *errcode)
 845 {
 846         struct sk_buff *skb;
 847         unsigned int gfp_mask;
 848         long timeo;
 849         int err;
 850
 851         gfp_mask = sk->sk_allocation;
 852         if (gfp_mask & __GFP_WAIT)
 853                 gfp_mask |= __GFP_REPEAT;
 854
 855         timeo = sock_sndtimeo(sk, noblock);
 856         while (1) {
 857                 err = sock_error(sk);
 858                 if (err != 0)
 859                         goto failure;
 860
 861                 err = -EPIPE;
 862                 if (sk->sk_shutdown & SEND_SHUTDOWN)
 863                         goto failure;
 864
 865                 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
 866                         skb = alloc_skb(header_len, sk->sk_allocation);
 867                         if (skb) {
 868                                 int npages;
 869                                 int i;
 870
 871                                 /* No pages, we're done... */
 872                                 if (!data_len)
 873                                         break;
 874
 875                                 npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
 876                                 skb->truesize += data_len;
 877                                 skb_shinfo(skb)->nr_frags = npages;
 878                                 for (i = 0; i < npages; i++) {
 879                                         struct page *page;
 880                                         skb_frag_t *frag;
 881
 882                                         page = alloc_pages(sk->sk_allocation, 0);
 883                                         if (!page) {
 884                                                 err = -ENOBUFS;
 885                                                 skb_shinfo(skb)->nr_frags = i;
 886                                                 kfree_skb(skb);
 887                                                 goto failure;
 888                                         }
 889
 890                                         frag = &skb_shinfo(skb)->frags[i];
 891                                         frag->page = page;
 892                                         frag->page_offset = 0;
 893                                         frag->size = (data_len >= PAGE_SIZE ?
 894                                                       PAGE_SIZE :
 895                                                       data_len);
 896                                         data_len -= PAGE_SIZE;
 897                                 }
 898
 899                                 /* Full success... */
 900                                 break;
 901                         }
 902                         err = -ENOBUFS;
 903                         goto failure;
 904                 }
 905                 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
 906                 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
 907                 err = -EAGAIN;
 908                 if (!timeo)
 909                         goto failure;
 910                 if (signal_pending(current))
 911                         goto interrupted;
 912                 timeo = sock_wait_for_wmem(sk, timeo);
 913         }
 914
 915         skb_set_owner_w(skb, sk);
 916         return skb;
 917
 918 interrupted:
 919         err = sock_intr_errno(timeo);
 920 failure:
 921         *errcode = err;
 922         return NULL;
 923 }
 924
 925 struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
 926                                     int noblock, int *errcode)
 927 {
 928         return sock_alloc_send_pskb(sk, size, 0, noblock, errcode);
 929 }
 930
 931 static void __lock_sock(struct sock *sk)
 932 {
 933         DEFINE_WAIT(wait);
 934
 935         for(;;) {
 936                 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
 937                                         TASK_UNINTERRUPTIBLE);
 938                 spin_unlock_bh(&sk->sk_lock.slock);
 939                 schedule();
 940                 spin_lock_bh(&sk->sk_lock.slock);
 941                 if(!sock_owned_by_user(sk))
 942                         break;
 943         }
 944         finish_wait(&sk->sk_lock.wq, &wait);
 945 }
 946
 947 static void __release_sock(struct sock *sk)
 948 {
 949         struct sk_buff *skb = sk->sk_backlog.head;
 950
 951         do {
 952                 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
 953                 bh_unlock_sock(sk);
 954
 955                 do {
 956                         struct sk_buff *next = skb->next;
 957
 958                         skb->next = NULL;
 959                         sk->sk_backlog_rcv(sk, skb);
 960
 961                         /*
 962                          * We are in process context here with softirqs
 963                          * disabled, use cond_resched_softirq() to preempt.
 964                          * This is safe to do because we've taken the backlog
 965                          * queue private:
 966                          */
 967                         cond_resched_softirq();
 968
 969                         skb = next;
 970                 } while (skb != NULL);
 971
 972                 bh_lock_sock(sk);
 973         } while((skb = sk->sk_backlog.head) != NULL);
 974 }
 975
 976 /**
 977  * sk_wait_data - wait for data to arrive at sk_receive_queue
 978  * sk - sock to wait on
 979  * timeo - for how long
 980  *
 981  * Now socket state including sk->sk_err is changed only under lock,
 982  * hence we may omit checks after joining wait queue.
 983  * We check receive queue before schedule() only as optimization;
 984  * it is very likely that release_sock() added new data.
 985  */
 986 int sk_wait_data(struct sock *sk, long *timeo)
 987 {
 988         int rc;
 989         DEFINE_WAIT(wait);
 990
 991         prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
 992         set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
 993         rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue));
 994         clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
 995         finish_wait(sk->sk_sleep, &wait);
 996         return rc;
 997 }
 998
 999 EXPORT_SYMBOL(sk_wait_data);
1000
1001 /*
1002  * Set of default routines for initialising struct proto_ops when
1003  * the protocol does not support a particular function. In certain
1004  * cases where it makes no sense for a protocol to have a "do nothing"
1005  * function, some default processing is provided.
1006  */
1007
1008 int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
1009 {
1010         return -EOPNOTSUPP;
1011 }
1012
1013 int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
1014                     int len, int flags)
1015 {
1016         return -EOPNOTSUPP;
1017 }
1018
1019 int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
1020 {
1021         return -EOPNOTSUPP;
1022 }
1023
1024 int sock_no_accept(struct socket *sock, struct socket *newsock, int flags)
1025 {
1026         return -EOPNOTSUPP;
1027 }
1028
1029 int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
1030                     int *len, int peer)
1031 {
1032         return -EOPNOTSUPP;
1033 }
1034
1035 unsigned int sock_no_poll(struct file * file, struct socket *sock, poll_table *pt)
1036 {
1037         return 0;
1038 }
1039
1040 int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1041 {
1042         return -EOPNOTSUPP;
1043 }
1044
1045 int sock_no_listen(struct socket *sock, int backlog)
1046 {
1047         return -EOPNOTSUPP;
1048 }
1049
1050 int sock_no_shutdown(struct socket *sock, int how)
1051 {
1052         return -EOPNOTSUPP;
1053 }
1054
1055 int sock_no_setsockopt(struct socket *sock, int level, int optname,
1056                     char __user *optval, int optlen)
1057 {
1058         return -EOPNOTSUPP;
1059 }
1060
1061 int sock_no_getsockopt(struct socket *sock, int level, int optname,
1062                     char __user *optval, int __user *optlen)
1063 {
1064         return -EOPNOTSUPP;
1065 }
1066
1067 int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
1068                     size_t len)
1069 {
1070         return -EOPNOTSUPP;
1071 }
1072
1073 int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
1074                     size_t len, int flags)
1075 {
1076         return -EOPNOTSUPP;
1077 }
1078
1079 int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
1080 {
1081         /* Mirror missing mmap method error code */
1082         return -ENODEV;
1083 }
1084
1085 ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
1086 {
1087         ssize_t res;
1088         struct msghdr msg = {.msg_flags = flags};
1089         struct kvec iov;
1090         char *kaddr = kmap(page);
1091         iov.iov_base = kaddr + offset;
1092         iov.iov_len = size;
1093         res = kernel_sendmsg(sock, &msg, &iov, 1, size);
1094         kunmap(page);
1095         return res;
1096 }
1097
1098 /*
1099  *      Default Socket Callbacks
1100  */
1101
1102 static void sock_def_wakeup(struct sock *sk)
1103 {
1104         read_lock(&sk->sk_callback_lock);
1105         if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
1106                 wake_up_interruptible_all(sk->sk_sleep);
1107         read_unlock(&sk->sk_callback_lock);
1108 }
1109
1110 static void sock_def_error_report(struct sock *sk)
1111 {
1112         read_lock(&sk->sk_callback_lock);
1113         if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
1114                 wake_up_interruptible(sk->sk_sleep);
1115         sk_wake_async(sk,0,POLL_ERR);
1116         read_unlock(&sk->sk_callback_lock);
1117 }
1118
1119 static void sock_def_readable(struct sock *sk, int len)
1120 {
1121         read_lock(&sk->sk_callback_lock);
1122         if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
1123                 wake_up_interruptible(sk->sk_sleep);
1124         sk_wake_async(sk,1,POLL_IN);
1125         read_unlock(&sk->sk_callback_lock);
1126 }
1127
1128 static void sock_def_write_space(struct sock *sk)
1129 {
1130         read_lock(&sk->sk_callback_lock);
1131
1132         /* Do not wake up a writer until he can make "significant"
1133          * progress.  --DaveM
1134          */
1135         if((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) {
1136                 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
1137                         wake_up_interruptible(sk->sk_sleep);
1138
1139                 /* Should agree with poll, otherwise some programs break */
1140                 if (sock_writeable(sk))
1141                         sk_wake_async(sk, 2, POLL_OUT);
1142         }
1143
1144         read_unlock(&sk->sk_callback_lock);
1145 }
1146
1147 static void sock_def_destruct(struct sock *sk)
1148 {
1149         if (sk->sk_protinfo)
1150                 kfree(sk->sk_protinfo);
1151 }
1152
1153 void sk_send_sigurg(struct sock *sk)
1154 {
1155         if (sk->sk_socket && sk->sk_socket->file)
1156                 if (send_sigurg(&sk->sk_socket->file->f_owner))
1157                         sk_wake_async(sk, 3, POLL_PRI);
1158 }
1159
1160 void sk_reset_timer(struct sock *sk, struct timer_list* timer,
1161                     unsigned long expires)
1162 {
1163         if (!mod_timer(timer, expires))
1164                 sock_hold(sk);
1165 }
1166
1167 EXPORT_SYMBOL(sk_reset_timer);
1168
1169 void sk_stop_timer(struct sock *sk, struct timer_list* timer)
1170 {
1171         if (timer_pending(timer) && del_timer(timer))
1172                 __sock_put(sk);
1173 }
1174
1175 EXPORT_SYMBOL(sk_stop_timer);
1176
1177 void sock_init_data(struct socket *sock, struct sock *sk)
1178 {
1179         skb_queue_head_init(&sk->sk_receive_queue);
1180         skb_queue_head_init(&sk->sk_write_queue);
1181         skb_queue_head_init(&sk->sk_error_queue);
1182
1183         sk->sk_send_head        =       NULL;
1184
1185         init_timer(&sk->sk_timer);
1186
1187         sk->sk_allocation       =       GFP_KERNEL;
1188         sk->sk_rcvbuf           =       sysctl_rmem_default;
1189         sk->sk_sndbuf           =       sysctl_wmem_default;
1190         sk->sk_state            =       TCP_CLOSE;
1191         sk->sk_zapped           =       1;
1192         sk->sk_socket           =       sock;
1193
1194         if(sock)
1195         {
1196                 sk->sk_type     =       sock->type;
1197                 sk->sk_sleep    =       &sock->wait;
1198                 sock->sk        =       sk;
1199         } else
1200                 sk->sk_sleep    =       NULL;
1201
1202         rwlock_init(&sk->sk_dst_lock);
1203         rwlock_init(&sk->sk_callback_lock);
1204
1205         sk->sk_state_change     =       sock_def_wakeup;
1206         sk->sk_data_ready       =       sock_def_readable;
1207         sk->sk_write_space      =       sock_def_write_space;
1208         sk->sk_error_report     =       sock_def_error_report;
1209         sk->sk_destruct         =       sock_def_destruct;
1210
1211         sk->sk_sndmsg_page      =       NULL;
1212         sk->sk_sndmsg_off       =       0;
1213
1214         sk->sk_peercred.pid     =       0;
1215         sk->sk_peercred.uid     =       -1;
1216         sk->sk_peercred.gid     =       -1;
1217         sk->sk_write_pending    =       0;
1218         sk->sk_rcvlowat         =       1;
1219         sk->sk_rcvtimeo         =       MAX_SCHEDULE_TIMEOUT;
1220         sk->sk_sndtimeo         =       MAX_SCHEDULE_TIMEOUT;
1221         sk->sk_owner            =       NULL;
1222
1223         sk->sk_stamp.tv_sec     = -1L;
1224         sk->sk_stamp.tv_usec    = -1L;
1225
1226         set_vx_info(&sk->sk_vx_info, current->vx_info);
1227         sk->sk_xid = vx_current_xid();
1228         vx_sock_inc(sk);
1229         set_nx_info(&sk->sk_nx_info, current->nx_info);
1230         sk->sk_nid = nx_current_nid();
1231         atomic_set(&sk->sk_refcnt, 1);
1232 }
1233
1234 void fastcall lock_sock(struct sock *sk)
1235 {
1236         might_sleep();
1237         spin_lock_bh(&(sk->sk_lock.slock));
1238         if (sk->sk_lock.owner)
1239                 __lock_sock(sk);
1240         sk->sk_lock.owner = (void *)1;
1241         spin_unlock_bh(&(sk->sk_lock.slock));
1242 }
1243
1244 EXPORT_SYMBOL(lock_sock);
1245
1246 void fastcall release_sock(struct sock *sk)
1247 {
1248         spin_lock_bh(&(sk->sk_lock.slock));
1249         if (sk->sk_backlog.tail)
1250                 __release_sock(sk);
1251         sk->sk_lock.owner = NULL;
1252         if (waitqueue_active(&(sk->sk_lock.wq)))
1253                 wake_up(&(sk->sk_lock.wq));
1254         spin_unlock_bh(&(sk->sk_lock.slock));
1255 }
1256 EXPORT_SYMBOL(release_sock);
1257
1258 int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
1259 {
1260         if (!sock_flag(sk, SOCK_TIMESTAMP))
1261                 sock_enable_timestamp(sk);
1262         if (sk->sk_stamp.tv_sec == -1)
1263                 return -ENOENT;
1264         if (sk->sk_stamp.tv_sec == 0)
1265                 do_gettimeofday(&sk->sk_stamp);
1266         return copy_to_user(userstamp, &sk->sk_stamp, sizeof(struct timeval)) ?
1267                 -EFAULT : 0;
1268 }
1269 EXPORT_SYMBOL(sock_get_timestamp);
1270
1271 void sock_enable_timestamp(struct sock *sk)
1272 {
1273         if (!sock_flag(sk, SOCK_TIMESTAMP)) {
1274                 sock_set_flag(sk, SOCK_TIMESTAMP);
1275                 net_enable_timestamp();
1276         }
1277 }
1278 EXPORT_SYMBOL(sock_enable_timestamp);
1279
1280 /*
1281  *      Get a socket option on an socket.
1282  *
1283  *      FIX: POSIX 1003.1g is very ambiguous here. It states that
1284  *      asynchronous errors should be reported by getsockopt. We assume
1285  *      this means if you specify SO_ERROR (otherwise whats the point of it).
1286  */
1287 int sock_common_getsockopt(struct socket *sock, int level, int optname,
1288                            char __user *optval, int __user *optlen)
1289 {
1290         struct sock *sk = sock->sk;
1291
1292         return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
1293 }
1294
1295 EXPORT_SYMBOL(sock_common_getsockopt);
1296
1297 int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock,
1298                         struct msghdr *msg, size_t size, int flags)
1299 {
1300         struct sock *sk = sock->sk;
1301         int addr_len = 0;
1302         int err;
1303
1304         err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT,
1305                                    flags & ~MSG_DONTWAIT, &addr_len);
1306         if (err >= 0)
1307                 msg->msg_namelen = addr_len;
1308         return err;
1309 }
1310
1311 EXPORT_SYMBOL(sock_common_recvmsg);
1312
1313 /*
1314  *      Set socket options on an inet socket.
1315  */
1316 int sock_common_setsockopt(struct socket *sock, int level, int optname,
1317                            char __user *optval, int optlen)
1318 {
1319         struct sock *sk = sock->sk;
1320
1321         return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
1322 }
1323
1324 EXPORT_SYMBOL(sock_common_setsockopt);
1325
1326 void sk_common_release(struct sock *sk)
1327 {
1328         if (sk->sk_prot->destroy)
1329                 sk->sk_prot->destroy(sk);
1330
1331         /*
1332          * Observation: when sock_common_release is called, processes have
1333          * no access to socket. But net still has.
1334          * Step one, detach it from networking:
1335          *
1336          * A. Remove from hash tables.
1337          */
1338
1339         sk->sk_prot->unhash(sk);
1340
1341         /*
1342          * In this point socket cannot receive new packets, but it is possible
1343          * that some packets are in flight because some CPU runs receiver and
1344          * did hash table lookup before we unhashed socket. They will achieve
1345          * receive queue and will be purged by socket destructor.
1346          *
1347          * Also we still have packets pending on receive queue and probably,
1348          * our own packets waiting in device queues. sock_destroy will drain
1349          * receive queue, but transmitted packets will delay socket destruction
1350          * until the last reference will be released.
1351          */
1352
1353         sock_orphan(sk);
1354
1355         xfrm_sk_free_policy(sk);
1356
1357 #ifdef INET_REFCNT_DEBUG
1358         if (atomic_read(&sk->sk_refcnt) != 1)
1359                 printk(KERN_DEBUG "Destruction of the socket %p delayed, c=%d\n",
1360                        sk, atomic_read(&sk->sk_refcnt));
1361 #endif
1362         sock_put(sk);
1363 }
1364
1365 EXPORT_SYMBOL(sk_common_release);
1366
1367 int sk_alloc_slab(struct proto *prot, char *name)
1368 {
1369         prot->slab = kmem_cache_create(name,
1370                                        prot->slab_obj_size, 0,
1371                                        SLAB_HWCACHE_ALIGN, NULL, NULL);
1372
1373         return prot->slab != NULL ? 0 : -ENOBUFS;
1374 }
1375
1376 EXPORT_SYMBOL(sk_alloc_slab);
1377
1378 void sk_free_slab(struct proto *prot)
1379 {
1380         if (prot->slab != NULL) {
1381                 kmem_cache_destroy(prot->slab);
1382                 prot->slab = NULL;
1383         }
1384 }
1385
1386 EXPORT_SYMBOL(sk_free_slab);
1387
1388 EXPORT_SYMBOL(sk_alloc);
1389 EXPORT_SYMBOL(sk_free);
1390 EXPORT_SYMBOL(sk_send_sigurg);
1391 EXPORT_SYMBOL(sock_alloc_send_skb);
1392 EXPORT_SYMBOL(sock_init_data);
1393 EXPORT_SYMBOL(sock_kfree_s);
1394 EXPORT_SYMBOL(sock_kmalloc);
1395 EXPORT_SYMBOL(sock_no_accept);
1396 EXPORT_SYMBOL(sock_no_bind);
1397 EXPORT_SYMBOL(sock_no_connect);
1398 EXPORT_SYMBOL(sock_no_getname);
1399 EXPORT_SYMBOL(sock_no_getsockopt);
1400 EXPORT_SYMBOL(sock_no_ioctl);
1401 EXPORT_SYMBOL(sock_no_listen);
1402 EXPORT_SYMBOL(sock_no_mmap);
1403 EXPORT_SYMBOL(sock_no_poll);
1404 EXPORT_SYMBOL(sock_no_recvmsg);
1405 EXPORT_SYMBOL(sock_no_sendmsg);
1406 EXPORT_SYMBOL(sock_no_sendpage);
1407 EXPORT_SYMBOL(sock_no_setsockopt);
1408 EXPORT_SYMBOL(sock_no_shutdown);
1409 EXPORT_SYMBOL(sock_no_socketpair);
1410 EXPORT_SYMBOL(sock_rfree);
1411 EXPORT_SYMBOL(sock_setsockopt);
1412 EXPORT_SYMBOL(sock_wfree);
1413 EXPORT_SYMBOL(sock_wmalloc);
1414 EXPORT_SYMBOL(sock_i_uid);
1415 EXPORT_SYMBOL(sock_i_ino);
1416 #ifdef CONFIG_SYSCTL
1417 EXPORT_SYMBOL(sysctl_optmem_max);
1418 EXPORT_SYMBOL(sysctl_rmem_max);
1419 EXPORT_SYMBOL(sysctl_wmem_max);
1420 #endif