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   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
  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/capability.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/module.h>
 101 #include <linux/proc_fs.h>
 102 #include <linux/seq_file.h>
 103 #include <linux/sched.h>
 104 #include <linux/timer.h>
 105 #include <linux/string.h>
 106 #include <linux/sockios.h>
 107 #include <linux/net.h>
 108 #include <linux/mm.h>
 109 #include <linux/slab.h>
 110 #include <linux/interrupt.h>
 111 #include <linux/poll.h>
 112 #include <linux/tcp.h>
 113 #include <linux/init.h>
 114
 115 #include <asm/uaccess.h>
 116 #include <asm/system.h>
 117
 118 #include <linux/netdevice.h>
 119 #include <net/protocol.h>
 120 #include <linux/skbuff.h>
 121 #include <net/request_sock.h>
 122 #include <net/sock.h>
 123 #include <net/xfrm.h>
 124 #include <linux/ipsec.h>
 125
 126 #include <linux/filter.h>
 127
 128 #ifdef CONFIG_INET
 129 #include <net/tcp.h>
 130 #endif
 131
 132 /*
 133  * Each address family might have different locking rules, so we have
 134  * one slock key per address family:
 135  */
 136 static struct lock_class_key af_family_keys[AF_MAX];
 137 static struct lock_class_key af_family_slock_keys[AF_MAX];
 138
 139 #ifdef CONFIG_DEBUG_LOCK_ALLOC
 140 /*
 141  * Make lock validator output more readable. (we pre-construct these
 142  * strings build-time, so that runtime initialization of socket
 143  * locks is fast):
 144  */
 145 static const char *af_family_key_strings[AF_MAX+1] = {
 146   "sk_lock-AF_UNSPEC", "sk_lock-AF_UNIX"     , "sk_lock-AF_INET"     ,
 147   "sk_lock-AF_AX25"  , "sk_lock-AF_IPX"      , "sk_lock-AF_APPLETALK",
 148   "sk_lock-AF_NETROM", "sk_lock-AF_BRIDGE"   , "sk_lock-AF_ATMPVC"   ,
 149   "sk_lock-AF_X25"   , "sk_lock-AF_INET6"    , "sk_lock-AF_ROSE"     ,
 150   "sk_lock-AF_DECnet", "sk_lock-AF_NETBEUI"  , "sk_lock-AF_SECURITY" ,
 151   "sk_lock-AF_KEY"   , "sk_lock-AF_NETLINK"  , "sk_lock-AF_PACKET"   ,
 152   "sk_lock-AF_ASH"   , "sk_lock-AF_ECONET"   , "sk_lock-AF_ATMSVC"   ,
 153   "sk_lock-21"       , "sk_lock-AF_SNA"      , "sk_lock-AF_IRDA"     ,
 154   "sk_lock-AF_PPPOX" , "sk_lock-AF_WANPIPE"  , "sk_lock-AF_LLC"      ,
 155   "sk_lock-27"       , "sk_lock-28"          , "sk_lock-29"          ,
 156   "sk_lock-AF_TIPC"  , "sk_lock-AF_BLUETOOTH", "sk_lock-AF_MAX"
 157 };
 158 static const char *af_family_slock_key_strings[AF_MAX+1] = {
 159   "slock-AF_UNSPEC", "slock-AF_UNIX"     , "slock-AF_INET"     ,
 160   "slock-AF_AX25"  , "slock-AF_IPX"      , "slock-AF_APPLETALK",
 161   "slock-AF_NETROM", "slock-AF_BRIDGE"   , "slock-AF_ATMPVC"   ,
 162   "slock-AF_X25"   , "slock-AF_INET6"    , "slock-AF_ROSE"     ,
 163   "slock-AF_DECnet", "slock-AF_NETBEUI"  , "slock-AF_SECURITY" ,
 164   "slock-AF_KEY"   , "slock-AF_NETLINK"  , "slock-AF_PACKET"   ,
 165   "slock-AF_ASH"   , "slock-AF_ECONET"   , "slock-AF_ATMSVC"   ,
 166   "slock-21"       , "slock-AF_SNA"      , "slock-AF_IRDA"     ,
 167   "slock-AF_PPPOX" , "slock-AF_WANPIPE"  , "slock-AF_LLC"      ,
 168   "slock-27"       , "slock-28"          , "slock-29"          ,
 169   "slock-AF_TIPC"  , "slock-AF_BLUETOOTH", "slock-AF_MAX"
 170 };
 171 #endif
 172
 173 /*
 174  * sk_callback_lock locking rules are per-address-family,
 175  * so split the lock classes by using a per-AF key:
 176  */
 177 static struct lock_class_key af_callback_keys[AF_MAX];
 178
 179 /* Take into consideration the size of the struct sk_buff overhead in the
 180  * determination of these values, since that is non-constant across
 181  * platforms.  This makes socket queueing behavior and performance
 182  * not depend upon such differences.
 183  */
 184 #define _SK_MEM_PACKETS         256
 185 #define _SK_MEM_OVERHEAD        (sizeof(struct sk_buff) + 256)
 186 #define SK_WMEM_MAX             (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
 187 #define SK_RMEM_MAX             (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
 188
 189 /* Run time adjustable parameters. */
 190 __u32 sysctl_wmem_max = SK_WMEM_MAX;
 191 __u32 sysctl_rmem_max = SK_RMEM_MAX;
 192 __u32 sysctl_wmem_default = SK_WMEM_MAX;
 193 __u32 sysctl_rmem_default = SK_RMEM_MAX;
 194
 195 /* Maximal space eaten by iovec or ancilliary data plus some space */
 196 int sysctl_optmem_max = sizeof(unsigned long)*(2*UIO_MAXIOV + 512);
 197
 198 static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen)
 199 {
 200         struct timeval tv;
 201
 202         if (optlen < sizeof(tv))
 203                 return -EINVAL;
 204         if (copy_from_user(&tv, optval, sizeof(tv)))
 205                 return -EFAULT;
 206
 207         *timeo_p = MAX_SCHEDULE_TIMEOUT;
 208         if (tv.tv_sec == 0 && tv.tv_usec == 0)
 209                 return 0;
 210         if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1))
 211                 *timeo_p = tv.tv_sec*HZ + (tv.tv_usec+(1000000/HZ-1))/(1000000/HZ);
 212         return 0;
 213 }
 214
 215 static void sock_warn_obsolete_bsdism(const char *name)
 216 {
 217         static int warned;
 218         static char warncomm[TASK_COMM_LEN];
 219         if (strcmp(warncomm, current->comm) && warned < 5) {
 220                 strcpy(warncomm,  current->comm);
 221                 printk(KERN_WARNING "process `%s' is using obsolete "
 222                        "%s SO_BSDCOMPAT\n", warncomm, name);
 223                 warned++;
 224         }
 225 }
 226
 227 static void sock_disable_timestamp(struct sock *sk)
 228 {
 229         if (sock_flag(sk, SOCK_TIMESTAMP)) {
 230                 sock_reset_flag(sk, SOCK_TIMESTAMP);
 231                 net_disable_timestamp();
 232         }
 233 }
 234
 235
 236 int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
 237 {
 238         int err = 0;
 239         int skb_len;
 240
 241         /* Cast skb->rcvbuf to unsigned... It's pointless, but reduces
 242            number of warnings when compiling with -W --ANK
 243          */
 244         if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >=
 245             (unsigned)sk->sk_rcvbuf) {
 246                 err = -ENOMEM;
 247                 goto out;
 248         }
 249
 250         /* It would be deadlock, if sock_queue_rcv_skb is used
 251            with socket lock! We assume that users of this
 252            function are lock free.
 253         */
 254         err = sk_filter(sk, skb, 1);
 255         if (err)
 256                 goto out;
 257
 258         skb->dev = NULL;
 259         skb_set_owner_r(skb, sk);
 260
 261         /* Cache the SKB length before we tack it onto the receive
 262          * queue.  Once it is added it no longer belongs to us and
 263          * may be freed by other threads of control pulling packets
 264          * from the queue.
 265          */
 266         skb_len = skb->len;
 267
 268         skb_queue_tail(&sk->sk_receive_queue, skb);
 269
 270         if (!sock_flag(sk, SOCK_DEAD))
 271                 sk->sk_data_ready(sk, skb_len);
 272 out:
 273         return err;
 274 }
 275 EXPORT_SYMBOL(sock_queue_rcv_skb);
 276
 277 int sk_receive_skb(struct sock *sk, struct sk_buff *skb)
 278 {
 279         int rc = NET_RX_SUCCESS;
 280
 281         if (sk_filter(sk, skb, 0))
 282                 goto discard_and_relse;
 283
 284         skb->dev = NULL;
 285
 286         bh_lock_sock(sk);
 287         if (!sock_owned_by_user(sk)) {
 288                 /*
 289                  * trylock + unlock semantics:
 290                  */
 291                 mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_);
 292
 293                 rc = sk->sk_backlog_rcv(sk, skb);
 294
 295                 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
 296         } else
 297                 sk_add_backlog(sk, skb);
 298         bh_unlock_sock(sk);
 299 out:
 300         sock_put(sk);
 301         return rc;
 302 discard_and_relse:
 303         kfree_skb(skb);
 304         goto out;
 305 }
 306 EXPORT_SYMBOL(sk_receive_skb);
 307
 308 struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie)
 309 {
 310         struct dst_entry *dst = sk->sk_dst_cache;
 311
 312         if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
 313                 sk->sk_dst_cache = NULL;
 314                 dst_release(dst);
 315                 return NULL;
 316         }
 317
 318         return dst;
 319 }
 320 EXPORT_SYMBOL(__sk_dst_check);
 321
 322 struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie)
 323 {
 324         struct dst_entry *dst = sk_dst_get(sk);
 325
 326         if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
 327                 sk_dst_reset(sk);
 328                 dst_release(dst);
 329                 return NULL;
 330         }
 331
 332         return dst;
 333 }
 334 EXPORT_SYMBOL(sk_dst_check);
 335
 336 /*
 337  *      This is meant for all protocols to use and covers goings on
 338  *      at the socket level. Everything here is generic.
 339  */
 340
 341 int sock_setsockopt(struct socket *sock, int level, int optname,
 342                     char __user *optval, int optlen)
 343 {
 344         struct sock *sk=sock->sk;
 345         struct sk_filter *filter;
 346         int val;
 347         int valbool;
 348         struct linger ling;
 349         int ret = 0;
 350
 351         /*
 352          *      Options without arguments
 353          */
 354
 355 #ifdef SO_DONTLINGER            /* Compatibility item... */
 356         if (optname == SO_DONTLINGER) {
 357                 lock_sock(sk);
 358                 sock_reset_flag(sk, SOCK_LINGER);
 359                 release_sock(sk);
 360                 return 0;
 361         }
 362 #endif
 363
 364         if(optlen<sizeof(int))
 365                 return(-EINVAL);
 366
 367         if (get_user(val, (int __user *)optval))
 368                 return -EFAULT;
 369
 370         valbool = val?1:0;
 371
 372         lock_sock(sk);
 373
 374         switch(optname)
 375         {
 376                 case SO_DEBUG:
 377                         if(val && !capable(CAP_NET_ADMIN))
 378                         {
 379                                 ret = -EACCES;
 380                         }
 381                         else if (valbool)
 382                                 sock_set_flag(sk, SOCK_DBG);
 383                         else
 384                                 sock_reset_flag(sk, SOCK_DBG);
 385                         break;
 386                 case SO_REUSEADDR:
 387                         sk->sk_reuse = valbool;
 388                         break;
 389                 case SO_TYPE:
 390                 case SO_ERROR:
 391                         ret = -ENOPROTOOPT;
 392                         break;
 393                 case SO_DONTROUTE:
 394                         if (valbool)
 395                                 sock_set_flag(sk, SOCK_LOCALROUTE);
 396                         else
 397                                 sock_reset_flag(sk, SOCK_LOCALROUTE);
 398                         break;
 399                 case SO_BROADCAST:
 400                         sock_valbool_flag(sk, SOCK_BROADCAST, valbool);
 401                         break;
 402                 case SO_SNDBUF:
 403                         /* Don't error on this BSD doesn't and if you think
 404                            about it this is right. Otherwise apps have to
 405                            play 'guess the biggest size' games. RCVBUF/SNDBUF
 406                            are treated in BSD as hints */
 407
 408                         if (val > sysctl_wmem_max)
 409                                 val = sysctl_wmem_max;
 410 set_sndbuf:
 411                         sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
 412                         if ((val * 2) < SOCK_MIN_SNDBUF)
 413                                 sk->sk_sndbuf = SOCK_MIN_SNDBUF;
 414                         else
 415                                 sk->sk_sndbuf = val * 2;
 416
 417                         /*
 418                          *      Wake up sending tasks if we
 419                          *      upped the value.
 420                          */
 421                         sk->sk_write_space(sk);
 422                         break;
 423
 424                 case SO_SNDBUFFORCE:
 425                         if (!capable(CAP_NET_ADMIN)) {
 426                                 ret = -EPERM;
 427                                 break;
 428                         }
 429                         goto set_sndbuf;
 430
 431                 case SO_RCVBUF:
 432                         /* Don't error on this BSD doesn't and if you think
 433                            about it this is right. Otherwise apps have to
 434                            play 'guess the biggest size' games. RCVBUF/SNDBUF
 435                            are treated in BSD as hints */
 436
 437                         if (val > sysctl_rmem_max)
 438                                 val = sysctl_rmem_max;
 439 set_rcvbuf:
 440                         sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
 441                         /*
 442                          * We double it on the way in to account for
 443                          * "struct sk_buff" etc. overhead.   Applications
 444                          * assume that the SO_RCVBUF setting they make will
 445                          * allow that much actual data to be received on that
 446                          * socket.
 447                          *
 448                          * Applications are unaware that "struct sk_buff" and
 449                          * other overheads allocate from the receive buffer
 450                          * during socket buffer allocation.
 451                          *
 452                          * And after considering the possible alternatives,
 453                          * returning the value we actually used in getsockopt
 454                          * is the most desirable behavior.
 455                          */
 456                         if ((val * 2) < SOCK_MIN_RCVBUF)
 457                                 sk->sk_rcvbuf = SOCK_MIN_RCVBUF;
 458                         else
 459                                 sk->sk_rcvbuf = val * 2;
 460                         break;
 461
 462                 case SO_RCVBUFFORCE:
 463                         if (!capable(CAP_NET_ADMIN)) {
 464                                 ret = -EPERM;
 465                                 break;
 466                         }
 467                         goto set_rcvbuf;
 468
 469                 case SO_KEEPALIVE:
 470 #ifdef CONFIG_INET
 471                         if (sk->sk_protocol == IPPROTO_TCP)
 472                                 tcp_set_keepalive(sk, valbool);
 473 #endif
 474                         sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool);
 475                         break;
 476
 477                 case SO_OOBINLINE:
 478                         sock_valbool_flag(sk, SOCK_URGINLINE, valbool);
 479                         break;
 480
 481                 case SO_NO_CHECK:
 482                         sk->sk_no_check = valbool;
 483                         break;
 484
 485                 case SO_PRIORITY:
 486                         if ((val >= 0 && val <= 6) || capable(CAP_NET_ADMIN))
 487                                 sk->sk_priority = val;
 488                         else
 489                                 ret = -EPERM;
 490                         break;
 491
 492                 case SO_LINGER:
 493                         if(optlen<sizeof(ling)) {
 494                                 ret = -EINVAL;  /* 1003.1g */
 495                                 break;
 496                         }
 497                         if (copy_from_user(&ling,optval,sizeof(ling))) {
 498                                 ret = -EFAULT;
 499                                 break;
 500                         }
 501                         if (!ling.l_onoff)
 502                                 sock_reset_flag(sk, SOCK_LINGER);
 503                         else {
 504 #if (BITS_PER_LONG == 32)
 505                                 if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ)
 506                                         sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT;
 507                                 else
 508 #endif
 509                                         sk->sk_lingertime = (unsigned int)ling.l_linger * HZ;
 510                                 sock_set_flag(sk, SOCK_LINGER);
 511                         }
 512                         break;
 513
 514                 case SO_BSDCOMPAT:
 515                         sock_warn_obsolete_bsdism("setsockopt");
 516                         break;
 517
 518                 case SO_PASSCRED:
 519                         if (valbool)
 520                                 set_bit(SOCK_PASSCRED, &sock->flags);
 521                         else
 522                                 clear_bit(SOCK_PASSCRED, &sock->flags);
 523                         break;
 524
 525                 case SO_TIMESTAMP:
 526                         if (valbool)  {
 527                                 sock_set_flag(sk, SOCK_RCVTSTAMP);
 528                                 sock_enable_timestamp(sk);
 529                         } else
 530                                 sock_reset_flag(sk, SOCK_RCVTSTAMP);
 531                         break;
 532
 533                 case SO_RCVLOWAT:
 534                         if (val < 0)
 535                                 val = INT_MAX;
 536                         sk->sk_rcvlowat = val ? : 1;
 537                         break;
 538
 539                 case SO_RCVTIMEO:
 540                         ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen);
 541                         break;
 542
 543                 case SO_SNDTIMEO:
 544                         ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen);
 545                         break;
 546
 547 #ifdef CONFIG_NETDEVICES
 548                 case SO_BINDTODEVICE:
 549                 {
 550                         char devname[IFNAMSIZ];
 551
 552                         /* Sorry... */
 553                         if (!capable(CAP_NET_RAW)) {
 554                                 ret = -EPERM;
 555                                 break;
 556                         }
 557
 558                         /* Bind this socket to a particular device like "eth0",
 559                          * as specified in the passed interface name. If the
 560                          * name is "" or the option length is zero the socket
 561                          * is not bound.
 562                          */
 563
 564                         if (!valbool) {
 565                                 sk->sk_bound_dev_if = 0;
 566                         } else {
 567                                 if (optlen > IFNAMSIZ - 1)
 568                                         optlen = IFNAMSIZ - 1;
 569                                 memset(devname, 0, sizeof(devname));
 570                                 if (copy_from_user(devname, optval, optlen)) {
 571                                         ret = -EFAULT;
 572                                         break;
 573                                 }
 574
 575                                 /* Remove any cached route for this socket. */
 576                                 sk_dst_reset(sk);
 577
 578                                 if (devname[0] == '\0') {
 579                                         sk->sk_bound_dev_if = 0;
 580                                 } else {
 581                                         struct net_device *dev = dev_get_by_name(devname);
 582                                         if (!dev) {
 583                                                 ret = -ENODEV;
 584                                                 break;
 585                                         }
 586                                         sk->sk_bound_dev_if = dev->ifindex;
 587                                         dev_put(dev);
 588                                 }
 589                         }
 590                         break;
 591                 }
 592 #endif
 593
 594
 595                 case SO_ATTACH_FILTER:
 596                         ret = -EINVAL;
 597                         if (optlen == sizeof(struct sock_fprog)) {
 598                                 struct sock_fprog fprog;
 599
 600                                 ret = -EFAULT;
 601                                 if (copy_from_user(&fprog, optval, sizeof(fprog)))
 602                                         break;
 603
 604                                 ret = sk_attach_filter(&fprog, sk);
 605                         }
 606                         break;
 607
 608                 case SO_DETACH_FILTER:
 609                         spin_lock_bh(&sk->sk_lock.slock);
 610                         filter = sk->sk_filter;
 611                         if (filter) {
 612                                 sk->sk_filter = NULL;
 613                                 spin_unlock_bh(&sk->sk_lock.slock);
 614                                 sk_filter_release(sk, filter);
 615                                 break;
 616                         }
 617                         spin_unlock_bh(&sk->sk_lock.slock);
 618                         ret = -ENONET;
 619                         break;
 620
 621                 case SO_PASSSEC:
 622                         if (valbool)
 623                                 set_bit(SOCK_PASSSEC, &sock->flags);
 624                         else
 625                                 clear_bit(SOCK_PASSSEC, &sock->flags);
 626                         break;
 627
 628                 /* We implement the SO_SNDLOWAT etc to
 629                    not be settable (1003.1g 5.3) */
 630                 default:
 631                         ret = -ENOPROTOOPT;
 632                         break;
 633         }
 634         release_sock(sk);
 635         return ret;
 636 }
 637
 638
 639 int sock_getsockopt(struct socket *sock, int level, int optname,
 640                     char __user *optval, int __user *optlen)
 641 {
 642         struct sock *sk = sock->sk;
 643
 644         union
 645         {
 646                 int val;
 647                 struct linger ling;
 648                 struct timeval tm;
 649         } v;
 650
 651         unsigned int lv = sizeof(int);
 652         int len;
 653
 654         if(get_user(len,optlen))
 655                 return -EFAULT;
 656         if(len < 0)
 657                 return -EINVAL;
 658
 659         switch(optname)
 660         {
 661                 case SO_DEBUG:
 662                         v.val = sock_flag(sk, SOCK_DBG);
 663                         break;
 664
 665                 case SO_DONTROUTE:
 666                         v.val = sock_flag(sk, SOCK_LOCALROUTE);
 667                         break;
 668
 669                 case SO_BROADCAST:
 670                         v.val = !!sock_flag(sk, SOCK_BROADCAST);
 671                         break;
 672
 673                 case SO_SNDBUF:
 674                         v.val = sk->sk_sndbuf;
 675                         break;
 676
 677                 case SO_RCVBUF:
 678                         v.val = sk->sk_rcvbuf;
 679                         break;
 680
 681                 case SO_REUSEADDR:
 682                         v.val = sk->sk_reuse;
 683                         break;
 684
 685                 case SO_KEEPALIVE:
 686                         v.val = !!sock_flag(sk, SOCK_KEEPOPEN);
 687                         break;
 688
 689                 case SO_TYPE:
 690                         v.val = sk->sk_type;
 691                         break;
 692
 693                 case SO_ERROR:
 694                         v.val = -sock_error(sk);
 695                         if(v.val==0)
 696                                 v.val = xchg(&sk->sk_err_soft, 0);
 697                         break;
 698
 699                 case SO_OOBINLINE:
 700                         v.val = !!sock_flag(sk, SOCK_URGINLINE);
 701                         break;
 702
 703                 case SO_NO_CHECK:
 704                         v.val = sk->sk_no_check;
 705                         break;
 706
 707                 case SO_PRIORITY:
 708                         v.val = sk->sk_priority;
 709                         break;
 710
 711                 case SO_LINGER:
 712                         lv              = sizeof(v.ling);
 713                         v.ling.l_onoff  = !!sock_flag(sk, SOCK_LINGER);
 714                         v.ling.l_linger = sk->sk_lingertime / HZ;
 715                         break;
 716
 717                 case SO_BSDCOMPAT:
 718                         sock_warn_obsolete_bsdism("getsockopt");
 719                         break;
 720
 721                 case SO_TIMESTAMP:
 722                         v.val = sock_flag(sk, SOCK_RCVTSTAMP);
 723                         break;
 724
 725                 case SO_RCVTIMEO:
 726                         lv=sizeof(struct timeval);
 727                         if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) {
 728                                 v.tm.tv_sec = 0;
 729                                 v.tm.tv_usec = 0;
 730                         } else {
 731                                 v.tm.tv_sec = sk->sk_rcvtimeo / HZ;
 732                                 v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ;
 733                         }
 734                         break;
 735
 736                 case SO_SNDTIMEO:
 737                         lv=sizeof(struct timeval);
 738                         if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) {
 739                                 v.tm.tv_sec = 0;
 740                                 v.tm.tv_usec = 0;
 741                         } else {
 742                                 v.tm.tv_sec = sk->sk_sndtimeo / HZ;
 743                                 v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ;
 744                         }
 745                         break;
 746
 747                 case SO_RCVLOWAT:
 748                         v.val = sk->sk_rcvlowat;
 749                         break;
 750
 751                 case SO_SNDLOWAT:
 752                         v.val=1;
 753                         break;
 754
 755                 case SO_PASSCRED:
 756                         v.val = test_bit(SOCK_PASSCRED, &sock->flags) ? 1 : 0;
 757                         break;
 758
 759                 case SO_PEERCRED:
 760                         if (len > sizeof(sk->sk_peercred))
 761                                 len = sizeof(sk->sk_peercred);
 762                         if (copy_to_user(optval, &sk->sk_peercred, len))
 763                                 return -EFAULT;
 764                         goto lenout;
 765
 766                 case SO_PEERNAME:
 767                 {
 768                         char address[128];
 769
 770                         if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2))
 771                                 return -ENOTCONN;
 772                         if (lv < len)
 773                                 return -EINVAL;
 774                         if (copy_to_user(optval, address, len))
 775                                 return -EFAULT;
 776                         goto lenout;
 777                 }
 778
 779                 /* Dubious BSD thing... Probably nobody even uses it, but
 780                  * the UNIX standard wants it for whatever reason... -DaveM
 781                  */
 782                 case SO_ACCEPTCONN:
 783                         v.val = sk->sk_state == TCP_LISTEN;
 784                         break;
 785
 786                 case SO_PASSSEC:
 787                         v.val = test_bit(SOCK_PASSSEC, &sock->flags) ? 1 : 0;
 788                         break;
 789
 790                 case SO_PEERSEC:
 791                         return security_socket_getpeersec_stream(sock, optval, optlen, len);
 792
 793                 default:
 794                         return(-ENOPROTOOPT);
 795         }
 796         if (len > lv)
 797                 len = lv;
 798         if (copy_to_user(optval, &v, len))
 799                 return -EFAULT;
 800 lenout:
 801         if (put_user(len, optlen))
 802                 return -EFAULT;
 803         return 0;
 804 }
 805
 806 /*
 807  * Initialize an sk_lock.
 808  *
 809  * (We also register the sk_lock with the lock validator.)
 810  */
 811 static void inline sock_lock_init(struct sock *sk)
 812 {
 813         spin_lock_init(&sk->sk_lock.slock);
 814         sk->sk_lock.owner = NULL;
 815         init_waitqueue_head(&sk->sk_lock.wq);
 816         /*
 817          * Make sure we are not reinitializing a held lock:
 818          */
 819         debug_check_no_locks_freed((void *)&sk->sk_lock, sizeof(sk->sk_lock));
 820
 821         /*
 822          * Mark both the sk_lock and the sk_lock.slock as a
 823          * per-address-family lock class:
 824          */
 825         lockdep_set_class_and_name(&sk->sk_lock.slock,
 826                                    af_family_slock_keys + sk->sk_family,
 827                                    af_family_slock_key_strings[sk->sk_family]);
 828         lockdep_init_map(&sk->sk_lock.dep_map,
 829                          af_family_key_strings[sk->sk_family],
 830                          af_family_keys + sk->sk_family);
 831 }
 832
 833 /**
 834  *      sk_alloc - All socket objects are allocated here
 835  *      @family: protocol family
 836  *      @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
 837  *      @prot: struct proto associated with this new sock instance
 838  *      @zero_it: if we should zero the newly allocated sock
 839  */
 840 struct sock *sk_alloc(int family, gfp_t priority,
 841                       struct proto *prot, int zero_it)
 842 {
 843         struct sock *sk = NULL;
 844         kmem_cache_t *slab = prot->slab;
 845
 846         if (slab != NULL)
 847                 sk = kmem_cache_alloc(slab, priority);
 848         else
 849                 sk = kmalloc(prot->obj_size, priority);
 850
 851         if (sk) {
 852                 if (zero_it) {
 853                         memset(sk, 0, prot->obj_size);
 854                         sk->sk_family = family;
 855                         /*
 856                          * See comment in struct sock definition to understand
 857                          * why we need sk_prot_creator -acme
 858                          */
 859                         sk->sk_prot = sk->sk_prot_creator = prot;
 860                         sock_lock_init(sk);
 861                 }
 862
 863                 if (security_sk_alloc(sk, family, priority))
 864                         goto out_free;
 865
 866                 if (!try_module_get(prot->owner))
 867                         goto out_free;
 868         }
 869         return sk;
 870
 871 out_free:
 872         if (slab != NULL)
 873                 kmem_cache_free(slab, sk);
 874         else
 875                 kfree(sk);
 876         return NULL;
 877 }
 878
 879 void sk_free(struct sock *sk)
 880 {
 881         struct sk_filter *filter;
 882         struct module *owner = sk->sk_prot_creator->owner;
 883
 884         if (sk->sk_destruct)
 885                 sk->sk_destruct(sk);
 886
 887         filter = sk->sk_filter;
 888         if (filter) {
 889                 sk_filter_release(sk, filter);
 890                 sk->sk_filter = NULL;
 891         }
 892
 893         sock_disable_timestamp(sk);
 894
 895         if (atomic_read(&sk->sk_omem_alloc))
 896                 printk(KERN_DEBUG "%s: optmem leakage (%d bytes) detected.\n",
 897                        __FUNCTION__, atomic_read(&sk->sk_omem_alloc));
 898
 899         security_sk_free(sk);
 900         if (sk->sk_prot_creator->slab != NULL)
 901                 kmem_cache_free(sk->sk_prot_creator->slab, sk);
 902         else
 903                 kfree(sk);
 904         module_put(owner);
 905 }
 906
 907 struct sock *sk_clone(const struct sock *sk, const gfp_t priority)
 908 {
 909         struct sock *newsk = sk_alloc(sk->sk_family, priority, sk->sk_prot, 0);
 910
 911         if (newsk != NULL) {
 912                 struct sk_filter *filter;
 913
 914                 memcpy(newsk, sk, sk->sk_prot->obj_size);
 915
 916                 /* SANITY */
 917                 sk_node_init(&newsk->sk_node);
 918                 sock_lock_init(newsk);
 919                 bh_lock_sock(newsk);
 920
 921                 atomic_set(&newsk->sk_rmem_alloc, 0);
 922                 atomic_set(&newsk->sk_wmem_alloc, 0);
 923                 atomic_set(&newsk->sk_omem_alloc, 0);
 924                 skb_queue_head_init(&newsk->sk_receive_queue);
 925                 skb_queue_head_init(&newsk->sk_write_queue);
 926 #ifdef CONFIG_NET_DMA
 927                 skb_queue_head_init(&newsk->sk_async_wait_queue);
 928 #endif
 929
 930                 rwlock_init(&newsk->sk_dst_lock);
 931                 rwlock_init(&newsk->sk_callback_lock);
 932                 lockdep_set_class(&newsk->sk_callback_lock,
 933                                    af_callback_keys + newsk->sk_family);
 934
 935                 newsk->sk_dst_cache     = NULL;
 936                 newsk->sk_wmem_queued   = 0;
 937                 newsk->sk_forward_alloc = 0;
 938                 newsk->sk_send_head     = NULL;
 939                 newsk->sk_backlog.head  = newsk->sk_backlog.tail = NULL;
 940                 newsk->sk_userlocks     = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
 941
 942                 sock_reset_flag(newsk, SOCK_DONE);
 943                 skb_queue_head_init(&newsk->sk_error_queue);
 944
 945                 filter = newsk->sk_filter;
 946                 if (filter != NULL)
 947                         sk_filter_charge(newsk, filter);
 948
 949                 if (unlikely(xfrm_sk_clone_policy(newsk))) {
 950                         /* It is still raw copy of parent, so invalidate
 951                          * destructor and make plain sk_free() */
 952                         newsk->sk_destruct = NULL;
 953                         sk_free(newsk);
 954                         newsk = NULL;
 955                         goto out;
 956                 }
 957
 958                 newsk->sk_err      = 0;
 959                 newsk->sk_priority = 0;
 960                 atomic_set(&newsk->sk_refcnt, 2);
 961
 962                 /*
 963                  * Increment the counter in the same struct proto as the master
 964                  * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
 965                  * is the same as sk->sk_prot->socks, as this field was copied
 966                  * with memcpy).
 967                  *
 968                  * This _changes_ the previous behaviour, where
 969                  * tcp_create_openreq_child always was incrementing the
 970                  * equivalent to tcp_prot->socks (inet_sock_nr), so this have
 971                  * to be taken into account in all callers. -acme
 972                  */
 973                 sk_refcnt_debug_inc(newsk);
 974                 newsk->sk_socket = NULL;
 975                 newsk->sk_sleep  = NULL;
 976
 977                 if (newsk->sk_prot->sockets_allocated)
 978                         atomic_inc(newsk->sk_prot->sockets_allocated);
 979         }
 980 out:
 981         return newsk;
 982 }
 983
 984 EXPORT_SYMBOL_GPL(sk_clone);
 985
 986 void __init sk_init(void)
 987 {
 988         if (num_physpages <= 4096) {
 989                 sysctl_wmem_max = 32767;
 990                 sysctl_rmem_max = 32767;
 991                 sysctl_wmem_default = 32767;
 992                 sysctl_rmem_default = 32767;
 993         } else if (num_physpages >= 131072) {
 994                 sysctl_wmem_max = 131071;
 995                 sysctl_rmem_max = 131071;
 996         }
 997 }
 998
 999 /*
1000  *      Simple resource managers for sockets.
1001  */
1002
1003
1004 /*
1005  * Write buffer destructor automatically called from kfree_skb.
1006  */
1007 void sock_wfree(struct sk_buff *skb)
1008 {
1009         struct sock *sk = skb->sk;
1010
1011         /* In case it might be waiting for more memory. */
1012         atomic_sub(skb->truesize, &sk->sk_wmem_alloc);
1013         if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE))
1014                 sk->sk_write_space(sk);
1015         sock_put(sk);
1016 }
1017
1018 /*
1019  * Read buffer destructor automatically called from kfree_skb.
1020  */
1021 void sock_rfree(struct sk_buff *skb)
1022 {
1023         struct sock *sk = skb->sk;
1024
1025         atomic_sub(skb->truesize, &sk->sk_rmem_alloc);
1026 }
1027
1028
1029 int sock_i_uid(struct sock *sk)
1030 {
1031         int uid;
1032
1033         read_lock(&sk->sk_callback_lock);
1034         uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : 0;
1035         read_unlock(&sk->sk_callback_lock);
1036         return uid;
1037 }
1038
1039 unsigned long sock_i_ino(struct sock *sk)
1040 {
1041         unsigned long ino;
1042
1043         read_lock(&sk->sk_callback_lock);
1044         ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
1045         read_unlock(&sk->sk_callback_lock);
1046         return ino;
1047 }
1048
1049 /*
1050  * Allocate a skb from the socket's send buffer.
1051  */
1052 struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
1053                              gfp_t priority)
1054 {
1055         if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
1056                 struct sk_buff * skb = alloc_skb(size, priority);
1057                 if (skb) {
1058                         skb_set_owner_w(skb, sk);
1059                         return skb;
1060                 }
1061         }
1062         return NULL;
1063 }
1064
1065 /*
1066  * Allocate a skb from the socket's receive buffer.
1067  */
1068 struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force,
1069                              gfp_t priority)
1070 {
1071         if (force || atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) {
1072                 struct sk_buff *skb = alloc_skb(size, priority);
1073                 if (skb) {
1074                         skb_set_owner_r(skb, sk);
1075                         return skb;
1076                 }
1077         }
1078         return NULL;
1079 }
1080
1081 /*
1082  * Allocate a memory block from the socket's option memory buffer.
1083  */
1084 void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
1085 {
1086         if ((unsigned)size <= sysctl_optmem_max &&
1087             atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) {
1088                 void *mem;
1089                 /* First do the add, to avoid the race if kmalloc
1090                  * might sleep.
1091                  */
1092                 atomic_add(size, &sk->sk_omem_alloc);
1093                 mem = kmalloc(size, priority);
1094                 if (mem)
1095                         return mem;
1096                 atomic_sub(size, &sk->sk_omem_alloc);
1097         }
1098         return NULL;
1099 }
1100
1101 /*
1102  * Free an option memory block.
1103  */
1104 void sock_kfree_s(struct sock *sk, void *mem, int size)
1105 {
1106         kfree(mem);
1107         atomic_sub(size, &sk->sk_omem_alloc);
1108 }
1109
1110 /* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
1111    I think, these locks should be removed for datagram sockets.
1112  */
1113 static long sock_wait_for_wmem(struct sock * sk, long timeo)
1114 {
1115         DEFINE_WAIT(wait);
1116
1117         clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1118         for (;;) {
1119                 if (!timeo)
1120                         break;
1121                 if (signal_pending(current))
1122                         break;
1123                 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1124                 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
1125                 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf)
1126                         break;
1127                 if (sk->sk_shutdown & SEND_SHUTDOWN)
1128                         break;
1129                 if (sk->sk_err)
1130                         break;
1131                 timeo = schedule_timeout(timeo);
1132         }
1133         finish_wait(sk->sk_sleep, &wait);
1134         return timeo;
1135 }
1136
1137
1138 /*
1139  *      Generic send/receive buffer handlers
1140  */
1141
1142 static struct sk_buff *sock_alloc_send_pskb(struct sock *sk,
1143                                             unsigned long header_len,
1144                                             unsigned long data_len,
1145                                             int noblock, int *errcode)
1146 {
1147         struct sk_buff *skb;
1148         gfp_t gfp_mask;
1149         long timeo;
1150         int err;
1151
1152         gfp_mask = sk->sk_allocation;
1153         if (gfp_mask & __GFP_WAIT)
1154                 gfp_mask |= __GFP_REPEAT;
1155
1156         timeo = sock_sndtimeo(sk, noblock);
1157         while (1) {
1158                 err = sock_error(sk);
1159                 if (err != 0)
1160                         goto failure;
1161
1162                 err = -EPIPE;
1163                 if (sk->sk_shutdown & SEND_SHUTDOWN)
1164                         goto failure;
1165
1166                 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
1167                         skb = alloc_skb(header_len, sk->sk_allocation);
1168                         if (skb) {
1169                                 int npages;
1170                                 int i;
1171
1172                                 /* No pages, we're done... */
1173                                 if (!data_len)
1174                                         break;
1175
1176                                 npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
1177                                 skb->truesize += data_len;
1178                                 skb_shinfo(skb)->nr_frags = npages;
1179                                 for (i = 0; i < npages; i++) {
1180                                         struct page *page;
1181                                         skb_frag_t *frag;
1182
1183                                         page = alloc_pages(sk->sk_allocation, 0);
1184                                         if (!page) {
1185                                                 err = -ENOBUFS;
1186                                                 skb_shinfo(skb)->nr_frags = i;
1187                                                 kfree_skb(skb);
1188                                                 goto failure;
1189                                         }
1190
1191                                         frag = &skb_shinfo(skb)->frags[i];
1192                                         frag->page = page;
1193                                         frag->page_offset = 0;
1194                                         frag->size = (data_len >= PAGE_SIZE ?
1195                                                       PAGE_SIZE :
1196                                                       data_len);
1197                                         data_len -= PAGE_SIZE;
1198                                 }
1199
1200                                 /* Full success... */
1201                                 break;
1202                         }
1203                         err = -ENOBUFS;
1204                         goto failure;
1205                 }
1206                 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1207                 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1208                 err = -EAGAIN;
1209                 if (!timeo)
1210                         goto failure;
1211                 if (signal_pending(current))
1212                         goto interrupted;
1213                 timeo = sock_wait_for_wmem(sk, timeo);
1214         }
1215
1216         skb_set_owner_w(skb, sk);
1217         return skb;
1218
1219 interrupted:
1220         err = sock_intr_errno(timeo);
1221 failure:
1222         *errcode = err;
1223         return NULL;
1224 }
1225
1226 struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
1227                                     int noblock, int *errcode)
1228 {
1229         return sock_alloc_send_pskb(sk, size, 0, noblock, errcode);
1230 }
1231
1232 static void __lock_sock(struct sock *sk)
1233 {
1234         DEFINE_WAIT(wait);
1235
1236         for(;;) {
1237                 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
1238                                         TASK_UNINTERRUPTIBLE);
1239                 spin_unlock_bh(&sk->sk_lock.slock);
1240                 schedule();
1241                 spin_lock_bh(&sk->sk_lock.slock);
1242                 if(!sock_owned_by_user(sk))
1243                         break;
1244         }
1245         finish_wait(&sk->sk_lock.wq, &wait);
1246 }
1247
1248 static void __release_sock(struct sock *sk)
1249 {
1250         struct sk_buff *skb = sk->sk_backlog.head;
1251
1252         do {
1253                 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
1254                 bh_unlock_sock(sk);
1255
1256                 do {
1257                         struct sk_buff *next = skb->next;
1258
1259                         skb->next = NULL;
1260                         sk->sk_backlog_rcv(sk, skb);
1261
1262                         /*
1263                          * We are in process context here with softirqs
1264                          * disabled, use cond_resched_softirq() to preempt.
1265                          * This is safe to do because we've taken the backlog
1266                          * queue private:
1267                          */
1268                         cond_resched_softirq();
1269
1270                         skb = next;
1271                 } while (skb != NULL);
1272
1273                 bh_lock_sock(sk);
1274         } while((skb = sk->sk_backlog.head) != NULL);
1275 }
1276
1277 /**
1278  * sk_wait_data - wait for data to arrive at sk_receive_queue
1279  * @sk:    sock to wait on
1280  * @timeo: for how long
1281  *
1282  * Now socket state including sk->sk_err is changed only under lock,
1283  * hence we may omit checks after joining wait queue.
1284  * We check receive queue before schedule() only as optimization;
1285  * it is very likely that release_sock() added new data.
1286  */
1287 int sk_wait_data(struct sock *sk, long *timeo)
1288 {
1289         int rc;
1290         DEFINE_WAIT(wait);
1291
1292         prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
1293         set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1294         rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue));
1295         clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1296         finish_wait(sk->sk_sleep, &wait);
1297         return rc;
1298 }
1299
1300 EXPORT_SYMBOL(sk_wait_data);
1301
1302 /*
1303  * Set of default routines for initialising struct proto_ops when
1304  * the protocol does not support a particular function. In certain
1305  * cases where it makes no sense for a protocol to have a "do nothing"
1306  * function, some default processing is provided.
1307  */
1308
1309 int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
1310 {
1311         return -EOPNOTSUPP;
1312 }
1313
1314 int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
1315                     int len, int flags)
1316 {
1317         return -EOPNOTSUPP;
1318 }
1319
1320 int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
1321 {
1322         return -EOPNOTSUPP;
1323 }
1324
1325 int sock_no_accept(struct socket *sock, struct socket *newsock, int flags)
1326 {
1327         return -EOPNOTSUPP;
1328 }
1329
1330 int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
1331                     int *len, int peer)
1332 {
1333         return -EOPNOTSUPP;
1334 }
1335
1336 unsigned int sock_no_poll(struct file * file, struct socket *sock, poll_table *pt)
1337 {
1338         return 0;
1339 }
1340
1341 int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1342 {
1343         return -EOPNOTSUPP;
1344 }
1345
1346 int sock_no_listen(struct socket *sock, int backlog)
1347 {
1348         return -EOPNOTSUPP;
1349 }
1350
1351 int sock_no_shutdown(struct socket *sock, int how)
1352 {
1353         return -EOPNOTSUPP;
1354 }
1355
1356 int sock_no_setsockopt(struct socket *sock, int level, int optname,
1357                     char __user *optval, int optlen)
1358 {
1359         return -EOPNOTSUPP;
1360 }
1361
1362 int sock_no_getsockopt(struct socket *sock, int level, int optname,
1363                     char __user *optval, int __user *optlen)
1364 {
1365         return -EOPNOTSUPP;
1366 }
1367
1368 int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
1369                     size_t len)
1370 {
1371         return -EOPNOTSUPP;
1372 }
1373
1374 int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
1375                     size_t len, int flags)
1376 {
1377         return -EOPNOTSUPP;
1378 }
1379
1380 int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
1381 {
1382         /* Mirror missing mmap method error code */
1383         return -ENODEV;
1384 }
1385
1386 ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
1387 {
1388         ssize_t res;
1389         struct msghdr msg = {.msg_flags = flags};
1390         struct kvec iov;
1391         char *kaddr = kmap(page);
1392         iov.iov_base = kaddr + offset;
1393         iov.iov_len = size;
1394         res = kernel_sendmsg(sock, &msg, &iov, 1, size);
1395         kunmap(page);
1396         return res;
1397 }
1398
1399 /*
1400  *      Default Socket Callbacks
1401  */
1402
1403 static void sock_def_wakeup(struct sock *sk)
1404 {
1405         read_lock(&sk->sk_callback_lock);
1406         if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
1407                 wake_up_interruptible_all(sk->sk_sleep);
1408         read_unlock(&sk->sk_callback_lock);
1409 }
1410
1411 static void sock_def_error_report(struct sock *sk)
1412 {
1413         read_lock(&sk->sk_callback_lock);
1414         if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
1415                 wake_up_interruptible(sk->sk_sleep);
1416         sk_wake_async(sk,0,POLL_ERR);
1417         read_unlock(&sk->sk_callback_lock);
1418 }
1419
1420 static void sock_def_readable(struct sock *sk, int len)
1421 {
1422         read_lock(&sk->sk_callback_lock);
1423         if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
1424                 wake_up_interruptible(sk->sk_sleep);
1425         sk_wake_async(sk,1,POLL_IN);
1426         read_unlock(&sk->sk_callback_lock);
1427 }
1428
1429 static void sock_def_write_space(struct sock *sk)
1430 {
1431         read_lock(&sk->sk_callback_lock);
1432
1433         /* Do not wake up a writer until he can make "significant"
1434          * progress.  --DaveM
1435          */
1436         if((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) {
1437                 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
1438                         wake_up_interruptible(sk->sk_sleep);
1439
1440                 /* Should agree with poll, otherwise some programs break */
1441                 if (sock_writeable(sk))
1442                         sk_wake_async(sk, 2, POLL_OUT);
1443         }
1444
1445         read_unlock(&sk->sk_callback_lock);
1446 }
1447
1448 static void sock_def_destruct(struct sock *sk)
1449 {
1450         kfree(sk->sk_protinfo);
1451 }
1452
1453 void sk_send_sigurg(struct sock *sk)
1454 {
1455         if (sk->sk_socket && sk->sk_socket->file)
1456                 if (send_sigurg(&sk->sk_socket->file->f_owner))
1457                         sk_wake_async(sk, 3, POLL_PRI);
1458 }
1459
1460 void sk_reset_timer(struct sock *sk, struct timer_list* timer,
1461                     unsigned long expires)
1462 {
1463         if (!mod_timer(timer, expires))
1464                 sock_hold(sk);
1465 }
1466
1467 EXPORT_SYMBOL(sk_reset_timer);
1468
1469 void sk_stop_timer(struct sock *sk, struct timer_list* timer)
1470 {
1471         if (timer_pending(timer) && del_timer(timer))
1472                 __sock_put(sk);
1473 }
1474
1475 EXPORT_SYMBOL(sk_stop_timer);
1476
1477 void sock_init_data(struct socket *sock, struct sock *sk)
1478 {
1479         skb_queue_head_init(&sk->sk_receive_queue);
1480         skb_queue_head_init(&sk->sk_write_queue);
1481         skb_queue_head_init(&sk->sk_error_queue);
1482 #ifdef CONFIG_NET_DMA
1483         skb_queue_head_init(&sk->sk_async_wait_queue);
1484 #endif
1485
1486         sk->sk_send_head        =       NULL;
1487
1488         init_timer(&sk->sk_timer);
1489
1490         sk->sk_allocation       =       GFP_KERNEL;
1491         sk->sk_rcvbuf           =       sysctl_rmem_default;
1492         sk->sk_sndbuf           =       sysctl_wmem_default;
1493         sk->sk_state            =       TCP_CLOSE;
1494         sk->sk_socket           =       sock;
1495
1496         sock_set_flag(sk, SOCK_ZAPPED);
1497
1498         if(sock)
1499         {
1500                 sk->sk_type     =       sock->type;
1501                 sk->sk_sleep    =       &sock->wait;
1502                 sock->sk        =       sk;
1503         } else
1504                 sk->sk_sleep    =       NULL;
1505
1506         rwlock_init(&sk->sk_dst_lock);
1507         rwlock_init(&sk->sk_callback_lock);
1508         lockdep_set_class(&sk->sk_callback_lock,
1509                            af_callback_keys + sk->sk_family);
1510
1511         sk->sk_state_change     =       sock_def_wakeup;
1512         sk->sk_data_ready       =       sock_def_readable;
1513         sk->sk_write_space      =       sock_def_write_space;
1514         sk->sk_error_report     =       sock_def_error_report;
1515         sk->sk_destruct         =       sock_def_destruct;
1516
1517         sk->sk_sndmsg_page      =       NULL;
1518         sk->sk_sndmsg_off       =       0;
1519
1520         sk->sk_peercred.pid     =       0;
1521         sk->sk_peercred.uid     =       -1;
1522         sk->sk_peercred.gid     =       -1;
1523         sk->sk_write_pending    =       0;
1524         sk->sk_rcvlowat         =       1;
1525         sk->sk_rcvtimeo         =       MAX_SCHEDULE_TIMEOUT;
1526         sk->sk_sndtimeo         =       MAX_SCHEDULE_TIMEOUT;
1527
1528         sk->sk_stamp.tv_sec     = -1L;
1529         sk->sk_stamp.tv_usec    = -1L;
1530
1531         atomic_set(&sk->sk_refcnt, 1);
1532 }
1533
1534 void fastcall lock_sock(struct sock *sk)
1535 {
1536         might_sleep();
1537         spin_lock_bh(&sk->sk_lock.slock);
1538         if (sk->sk_lock.owner)
1539                 __lock_sock(sk);
1540         sk->sk_lock.owner = (void *)1;
1541         spin_unlock(&sk->sk_lock.slock);
1542         /*
1543          * The sk_lock has mutex_lock() semantics here:
1544          */
1545         mutex_acquire(&sk->sk_lock.dep_map, 0, 0, _RET_IP_);
1546         local_bh_enable();
1547 }
1548
1549 EXPORT_SYMBOL(lock_sock);
1550
1551 void fastcall release_sock(struct sock *sk)
1552 {
1553         /*
1554          * The sk_lock has mutex_unlock() semantics:
1555          */
1556         mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
1557
1558         spin_lock_bh(&sk->sk_lock.slock);
1559         if (sk->sk_backlog.tail)
1560                 __release_sock(sk);
1561         sk->sk_lock.owner = NULL;
1562         if (waitqueue_active(&sk->sk_lock.wq))
1563                 wake_up(&sk->sk_lock.wq);
1564         spin_unlock_bh(&sk->sk_lock.slock);
1565 }
1566 EXPORT_SYMBOL(release_sock);
1567
1568 int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
1569 {
1570         if (!sock_flag(sk, SOCK_TIMESTAMP))
1571                 sock_enable_timestamp(sk);
1572         if (sk->sk_stamp.tv_sec == -1)
1573                 return -ENOENT;
1574         if (sk->sk_stamp.tv_sec == 0)
1575                 do_gettimeofday(&sk->sk_stamp);
1576         return copy_to_user(userstamp, &sk->sk_stamp, sizeof(struct timeval)) ?
1577                 -EFAULT : 0;
1578 }
1579 EXPORT_SYMBOL(sock_get_timestamp);
1580
1581 void sock_enable_timestamp(struct sock *sk)
1582 {
1583         if (!sock_flag(sk, SOCK_TIMESTAMP)) {
1584                 sock_set_flag(sk, SOCK_TIMESTAMP);
1585                 net_enable_timestamp();
1586         }
1587 }
1588 EXPORT_SYMBOL(sock_enable_timestamp);
1589
1590 /*
1591  *      Get a socket option on an socket.
1592  *
1593  *      FIX: POSIX 1003.1g is very ambiguous here. It states that
1594  *      asynchronous errors should be reported by getsockopt. We assume
1595  *      this means if you specify SO_ERROR (otherwise whats the point of it).
1596  */
1597 int sock_common_getsockopt(struct socket *sock, int level, int optname,
1598                            char __user *optval, int __user *optlen)
1599 {
1600         struct sock *sk = sock->sk;
1601
1602         return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
1603 }
1604
1605 EXPORT_SYMBOL(sock_common_getsockopt);
1606
1607 #ifdef CONFIG_COMPAT
1608 int compat_sock_common_getsockopt(struct socket *sock, int level, int optname,
1609                                   char __user *optval, int __user *optlen)
1610 {
1611         struct sock *sk = sock->sk;
1612
1613         if (sk->sk_prot->compat_setsockopt != NULL)
1614                 return sk->sk_prot->compat_getsockopt(sk, level, optname,
1615                                                       optval, optlen);
1616         return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
1617 }
1618 EXPORT_SYMBOL(compat_sock_common_getsockopt);
1619 #endif
1620
1621 int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock,
1622                         struct msghdr *msg, size_t size, int flags)
1623 {
1624         struct sock *sk = sock->sk;
1625         int addr_len = 0;
1626         int err;
1627
1628         err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT,
1629                                    flags & ~MSG_DONTWAIT, &addr_len);
1630         if (err >= 0)
1631                 msg->msg_namelen = addr_len;
1632         return err;
1633 }
1634
1635 EXPORT_SYMBOL(sock_common_recvmsg);
1636
1637 /*
1638  *      Set socket options on an inet socket.
1639  */
1640 int sock_common_setsockopt(struct socket *sock, int level, int optname,
1641                            char __user *optval, int optlen)
1642 {
1643         struct sock *sk = sock->sk;
1644
1645         return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
1646 }
1647
1648 EXPORT_SYMBOL(sock_common_setsockopt);
1649
1650 #ifdef CONFIG_COMPAT
1651 int compat_sock_common_setsockopt(struct socket *sock, int level, int optname,
1652                                   char __user *optval, int optlen)
1653 {
1654         struct sock *sk = sock->sk;
1655
1656         if (sk->sk_prot->compat_setsockopt != NULL)
1657                 return sk->sk_prot->compat_setsockopt(sk, level, optname,
1658                                                       optval, optlen);
1659         return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
1660 }
1661 EXPORT_SYMBOL(compat_sock_common_setsockopt);
1662 #endif
1663
1664 void sk_common_release(struct sock *sk)
1665 {
1666         if (sk->sk_prot->destroy)
1667                 sk->sk_prot->destroy(sk);
1668
1669         /*
1670          * Observation: when sock_common_release is called, processes have
1671          * no access to socket. But net still has.
1672          * Step one, detach it from networking:
1673          *
1674          * A. Remove from hash tables.
1675          */
1676
1677         sk->sk_prot->unhash(sk);
1678
1679         /*
1680          * In this point socket cannot receive new packets, but it is possible
1681          * that some packets are in flight because some CPU runs receiver and
1682          * did hash table lookup before we unhashed socket. They will achieve
1683          * receive queue and will be purged by socket destructor.
1684          *
1685          * Also we still have packets pending on receive queue and probably,
1686          * our own packets waiting in device queues. sock_destroy will drain
1687          * receive queue, but transmitted packets will delay socket destruction
1688          * until the last reference will be released.
1689          */
1690
1691         sock_orphan(sk);
1692
1693         xfrm_sk_free_policy(sk);
1694
1695         sk_refcnt_debug_release(sk);
1696         sock_put(sk);
1697 }
1698
1699 EXPORT_SYMBOL(sk_common_release);
1700
1701 static DEFINE_RWLOCK(proto_list_lock);
1702 static LIST_HEAD(proto_list);
1703
1704 int proto_register(struct proto *prot, int alloc_slab)
1705 {
1706         char *request_sock_slab_name = NULL;
1707         char *timewait_sock_slab_name;
1708         int rc = -ENOBUFS;
1709
1710         if (alloc_slab) {
1711                 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0,
1712                                                SLAB_HWCACHE_ALIGN, NULL, NULL);
1713
1714                 if (prot->slab == NULL) {
1715                         printk(KERN_CRIT "%s: Can't create sock SLAB cache!\n",
1716                                prot->name);
1717                         goto out;
1718                 }
1719
1720                 if (prot->rsk_prot != NULL) {
1721                         static const char mask[] = "request_sock_%s";
1722
1723                         request_sock_slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL);
1724                         if (request_sock_slab_name == NULL)
1725                                 goto out_free_sock_slab;
1726
1727                         sprintf(request_sock_slab_name, mask, prot->name);
1728                         prot->rsk_prot->slab = kmem_cache_create(request_sock_slab_name,
1729                                                                  prot->rsk_prot->obj_size, 0,
1730                                                                  SLAB_HWCACHE_ALIGN, NULL, NULL);
1731
1732                         if (prot->rsk_prot->slab == NULL) {
1733                                 printk(KERN_CRIT "%s: Can't create request sock SLAB cache!\n",
1734                                        prot->name);
1735                                 goto out_free_request_sock_slab_name;
1736                         }
1737                 }
1738
1739                 if (prot->twsk_prot != NULL) {
1740                         static const char mask[] = "tw_sock_%s";
1741
1742                         timewait_sock_slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL);
1743
1744                         if (timewait_sock_slab_name == NULL)
1745                                 goto out_free_request_sock_slab;
1746
1747                         sprintf(timewait_sock_slab_name, mask, prot->name);
1748                         prot->twsk_prot->twsk_slab =
1749                                 kmem_cache_create(timewait_sock_slab_name,
1750                                                   prot->twsk_prot->twsk_obj_size,
1751                                                   0, SLAB_HWCACHE_ALIGN,
1752                                                   NULL, NULL);
1753                         if (prot->twsk_prot->twsk_slab == NULL)
1754                                 goto out_free_timewait_sock_slab_name;
1755                 }
1756         }
1757
1758         write_lock(&proto_list_lock);
1759         list_add(&prot->node, &proto_list);
1760         write_unlock(&proto_list_lock);
1761         rc = 0;
1762 out:
1763         return rc;
1764 out_free_timewait_sock_slab_name:
1765         kfree(timewait_sock_slab_name);
1766 out_free_request_sock_slab:
1767         if (prot->rsk_prot && prot->rsk_prot->slab) {
1768                 kmem_cache_destroy(prot->rsk_prot->slab);
1769                 prot->rsk_prot->slab = NULL;
1770         }
1771 out_free_request_sock_slab_name:
1772         kfree(request_sock_slab_name);
1773 out_free_sock_slab:
1774         kmem_cache_destroy(prot->slab);
1775         prot->slab = NULL;
1776         goto out;
1777 }
1778
1779 EXPORT_SYMBOL(proto_register);
1780
1781 void proto_unregister(struct proto *prot)
1782 {
1783         write_lock(&proto_list_lock);
1784         list_del(&prot->node);
1785         write_unlock(&proto_list_lock);
1786
1787         if (prot->slab != NULL) {
1788                 kmem_cache_destroy(prot->slab);
1789                 prot->slab = NULL;
1790         }
1791
1792         if (prot->rsk_prot != NULL && prot->rsk_prot->slab != NULL) {
1793                 const char *name = kmem_cache_name(prot->rsk_prot->slab);
1794
1795                 kmem_cache_destroy(prot->rsk_prot->slab);
1796                 kfree(name);
1797                 prot->rsk_prot->slab = NULL;
1798         }
1799
1800         if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) {
1801                 const char *name = kmem_cache_name(prot->twsk_prot->twsk_slab);
1802
1803                 kmem_cache_destroy(prot->twsk_prot->twsk_slab);
1804                 kfree(name);
1805                 prot->twsk_prot->twsk_slab = NULL;
1806         }
1807 }
1808
1809 EXPORT_SYMBOL(proto_unregister);
1810
1811 #ifdef CONFIG_PROC_FS
1812 static inline struct proto *__proto_head(void)
1813 {
1814         return list_entry(proto_list.next, struct proto, node);
1815 }
1816
1817 static inline struct proto *proto_head(void)
1818 {
1819         return list_empty(&proto_list) ? NULL : __proto_head();
1820 }
1821
1822 static inline struct proto *proto_next(struct proto *proto)
1823 {
1824         return proto->node.next == &proto_list ? NULL :
1825                 list_entry(proto->node.next, struct proto, node);
1826 }
1827
1828 static inline struct proto *proto_get_idx(loff_t pos)
1829 {
1830         struct proto *proto;
1831         loff_t i = 0;
1832
1833         list_for_each_entry(proto, &proto_list, node)
1834                 if (i++ == pos)
1835                         goto out;
1836
1837         proto = NULL;
1838 out:
1839         return proto;
1840 }
1841
1842 static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
1843 {
1844         read_lock(&proto_list_lock);
1845         return *pos ? proto_get_idx(*pos - 1) : SEQ_START_TOKEN;
1846 }
1847
1848 static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1849 {
1850         ++*pos;
1851         return v == SEQ_START_TOKEN ? proto_head() : proto_next(v);
1852 }
1853
1854 static void proto_seq_stop(struct seq_file *seq, void *v)
1855 {
1856         read_unlock(&proto_list_lock);
1857 }
1858
1859 static char proto_method_implemented(const void *method)
1860 {
1861         return method == NULL ? 'n' : 'y';
1862 }
1863
1864 static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
1865 {
1866         seq_printf(seq, "%-9s %4u %6d  %6d   %-3s %6u   %-3s  %-10s "
1867                         "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
1868                    proto->name,
1869                    proto->obj_size,
1870                    proto->sockets_allocated != NULL ? atomic_read(proto->sockets_allocated) : -1,
1871                    proto->memory_allocated != NULL ? atomic_read(proto->memory_allocated) : -1,
1872                    proto->memory_pressure != NULL ? *proto->memory_pressure ? "yes" : "no" : "NI",
1873                    proto->max_header,
1874                    proto->slab == NULL ? "no" : "yes",
1875                    module_name(proto->owner),
1876                    proto_method_implemented(proto->close),
1877                    proto_method_implemented(proto->connect),
1878                    proto_method_implemented(proto->disconnect),
1879                    proto_method_implemented(proto->accept),
1880                    proto_method_implemented(proto->ioctl),
1881                    proto_method_implemented(proto->init),
1882                    proto_method_implemented(proto->destroy),
1883                    proto_method_implemented(proto->shutdown),
1884                    proto_method_implemented(proto->setsockopt),
1885                    proto_method_implemented(proto->getsockopt),
1886                    proto_method_implemented(proto->sendmsg),
1887                    proto_method_implemented(proto->recvmsg),
1888                    proto_method_implemented(proto->sendpage),
1889                    proto_method_implemented(proto->bind),
1890                    proto_method_implemented(proto->backlog_rcv),
1891                    proto_method_implemented(proto->hash),
1892                    proto_method_implemented(proto->unhash),
1893                    proto_method_implemented(proto->get_port),
1894                    proto_method_implemented(proto->enter_memory_pressure));
1895 }
1896
1897 static int proto_seq_show(struct seq_file *seq, void *v)
1898 {
1899         if (v == SEQ_START_TOKEN)
1900                 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
1901                            "protocol",
1902                            "size",
1903                            "sockets",
1904                            "memory",
1905                            "press",
1906                            "maxhdr",
1907                            "slab",
1908                            "module",
1909                            "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
1910         else
1911                 proto_seq_printf(seq, v);
1912         return 0;
1913 }
1914
1915 static struct seq_operations proto_seq_ops = {
1916         .start  = proto_seq_start,
1917         .next   = proto_seq_next,
1918         .stop   = proto_seq_stop,
1919         .show   = proto_seq_show,
1920 };
1921
1922 static int proto_seq_open(struct inode *inode, struct file *file)
1923 {
1924         return seq_open(file, &proto_seq_ops);
1925 }
1926
1927 static struct file_operations proto_seq_fops = {
1928         .owner          = THIS_MODULE,
1929         .open           = proto_seq_open,
1930         .read           = seq_read,
1931         .llseek         = seq_lseek,
1932         .release        = seq_release,
1933 };
1934
1935 static int __init proto_init(void)
1936 {
1937         /* register /proc/net/protocols */
1938         return proc_net_fops_create("protocols", S_IRUGO, &proto_seq_fops) == NULL ? -ENOBUFS : 0;
1939 }
1940
1941 subsys_initcall(proto_init);
1942
1943 #endif /* PROC_FS */
1944
1945 EXPORT_SYMBOL(sk_alloc);
1946 EXPORT_SYMBOL(sk_free);
1947 EXPORT_SYMBOL(sk_send_sigurg);
1948 EXPORT_SYMBOL(sock_alloc_send_skb);
1949 EXPORT_SYMBOL(sock_init_data);
1950 EXPORT_SYMBOL(sock_kfree_s);
1951 EXPORT_SYMBOL(sock_kmalloc);
1952 EXPORT_SYMBOL(sock_no_accept);
1953 EXPORT_SYMBOL(sock_no_bind);
1954 EXPORT_SYMBOL(sock_no_connect);
1955 EXPORT_SYMBOL(sock_no_getname);
1956 EXPORT_SYMBOL(sock_no_getsockopt);
1957 EXPORT_SYMBOL(sock_no_ioctl);
1958 EXPORT_SYMBOL(sock_no_listen);
1959 EXPORT_SYMBOL(sock_no_mmap);
1960 EXPORT_SYMBOL(sock_no_poll);
1961 EXPORT_SYMBOL(sock_no_recvmsg);
1962 EXPORT_SYMBOL(sock_no_sendmsg);
1963 EXPORT_SYMBOL(sock_no_sendpage);
1964 EXPORT_SYMBOL(sock_no_setsockopt);
1965 EXPORT_SYMBOL(sock_no_shutdown);
1966 EXPORT_SYMBOL(sock_no_socketpair);
1967 EXPORT_SYMBOL(sock_rfree);
1968 EXPORT_SYMBOL(sock_setsockopt);
1969 EXPORT_SYMBOL(sock_wfree);
1970 EXPORT_SYMBOL(sock_wmalloc);
1971 EXPORT_SYMBOL(sock_i_uid);
1972 EXPORT_SYMBOL(sock_i_ino);
1973 EXPORT_SYMBOL(sysctl_optmem_max);
1974 #ifdef CONFIG_SYSCTL
1975 EXPORT_SYMBOL(sysctl_rmem_max);
1976 EXPORT_SYMBOL(sysctl_wmem_max);
1977 #endif