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  * Authors:     Ross Biro
  11  *              Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
  12  *              Florian La Roche, <flla@stud.uni-sb.de>
  13  *              Alan Cox, <A.Cox@swansea.ac.uk>
  14  *
  15  * Fixes:
  16  *              Alan Cox        :       Numerous verify_area() problems
  17  *              Alan Cox        :       Connecting on a connecting socket
  18  *                                      now returns an error for tcp.
  19  *              Alan Cox        :       sock->protocol is set correctly.
  20  *                                      and is not sometimes left as 0.
  21  *              Alan Cox        :       connect handles icmp errors on a
  22  *                                      connect properly. Unfortunately there
  23  *                                      is a restart syscall nasty there. I
  24  *                                      can't match BSD without hacking the C
  25  *                                      library. Ideas urgently sought!
  26  *              Alan Cox        :       Disallow bind() to addresses that are
  27  *                                      not ours - especially broadcast ones!!
  28  *              Alan Cox        :       Socket 1024 _IS_ ok for users. (fencepost)
  29  *              Alan Cox        :       sock_wfree/sock_rfree don't destroy sockets,
  30  *                                      instead they leave that for the DESTROY timer.
  31  *              Alan Cox        :       Clean up error flag in accept
  32  *              Alan Cox        :       TCP ack handling is buggy, the DESTROY timer
  33  *                                      was buggy. Put a remove_sock() in the handler
  34  *                                      for memory when we hit 0. Also altered the timer
  35  *                                      code. The ACK stuff can wait and needs major
  36  *                                      TCP layer surgery.
  37  *              Alan Cox        :       Fixed TCP ack bug, removed remove sock
  38  *                                      and fixed timer/inet_bh race.
  39  *              Alan Cox        :       Added zapped flag for TCP
  40  *              Alan Cox        :       Move kfree_skb into skbuff.c and tidied up surplus code
  41  *              Alan Cox        :       for new sk_buff allocations wmalloc/rmalloc now call alloc_skb
  42  *              Alan Cox        :       kfree_s calls now are kfree_skbmem so we can track skb resources
  43  *              Alan Cox        :       Supports socket option broadcast now as does udp. Packet and raw need fixing.
  44  *              Alan Cox        :       Added RCVBUF,SNDBUF size setting. It suddenly occurred to me how easy it was so...
  45  *              Rick Sladkey    :       Relaxed UDP rules for matching packets.
  46  *              C.E.Hawkins     :       IFF_PROMISC/SIOCGHWADDR support
  47  *      Pauline Middelink       :       identd support
  48  *              Alan Cox        :       Fixed connect() taking signals I think.
  49  *              Alan Cox        :       SO_LINGER supported
  50  *              Alan Cox        :       Error reporting fixes
  51  *              Anonymous       :       inet_create tidied up (sk->reuse setting)
  52  *              Alan Cox        :       inet sockets don't set sk->type!
  53  *              Alan Cox        :       Split socket option code
  54  *              Alan Cox        :       Callbacks
  55  *              Alan Cox        :       Nagle flag for Charles & Johannes stuff
  56  *              Alex            :       Removed restriction on inet fioctl
  57  *              Alan Cox        :       Splitting INET from NET core
  58  *              Alan Cox        :       Fixed bogus SO_TYPE handling in getsockopt()
  59  *              Adam Caldwell   :       Missing return in SO_DONTROUTE/SO_DEBUG code
  60  *              Alan Cox        :       Split IP from generic code
  61  *              Alan Cox        :       New kfree_skbmem()
  62  *              Alan Cox        :       Make SO_DEBUG superuser only.
  63  *              Alan Cox        :       Allow anyone to clear SO_DEBUG
  64  *                                      (compatibility fix)
  65  *              Alan Cox        :       Added optimistic memory grabbing for AF_UNIX throughput.
  66  *              Alan Cox        :       Allocator for a socket is settable.
  67  *              Alan Cox        :       SO_ERROR includes soft errors.
  68  *              Alan Cox        :       Allow NULL arguments on some SO_ opts
  69  *              Alan Cox        :       Generic socket allocation to make hooks
  70  *                                      easier (suggested by Craig Metz).
  71  *              Michael Pall    :       SO_ERROR returns positive errno again
  72  *              Steve Whitehouse:       Added default destructor to free
  73  *                                      protocol private data.
  74  *              Steve Whitehouse:       Added various other default routines
  75  *                                      common to several socket families.
  76  *              Chris Evans     :       Call suser() check last on F_SETOWN
  77  *              Jay Schulist    :       Added SO_ATTACH_FILTER and SO_DETACH_FILTER.
  78  *              Andi Kleen      :       Add sock_kmalloc()/sock_kfree_s()
  79  *              Andi Kleen      :       Fix write_space callback
  80  *              Chris Evans     :       Security fixes - signedness again
  81  *              Arnaldo C. Melo :       cleanups, use skb_queue_purge
  82  *
  83  * To Fix:
  84  *
  85  *
  86  *              This program is free software; you can redistribute it and/or
  87  *              modify it under the terms of the GNU General Public License
  88  *              as published by the Free Software Foundation; either version
  89  *              2 of the License, or (at your option) any later version.
  90  */
  91
  92 #include <linux/capability.h>
  93 #include <linux/errno.h>
  94 #include <linux/types.h>
  95 #include <linux/socket.h>
  96 #include <linux/in.h>
  97 #include <linux/kernel.h>
  98 #include <linux/module.h>
  99 #include <linux/proc_fs.h>
 100 #include <linux/seq_file.h>
 101 #include <linux/sched.h>
 102 #include <linux/timer.h>
 103 #include <linux/string.h>
 104 #include <linux/sockios.h>
 105 #include <linux/net.h>
 106 #include <linux/mm.h>
 107 #include <linux/slab.h>
 108 #include <linux/interrupt.h>
 109 #include <linux/poll.h>
 110 #include <linux/tcp.h>
 111 #include <linux/init.h>
 112 #include <linux/highmem.h>
 113 #include <linux/user_namespace.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/net_namespace.h>
 122 #include <net/request_sock.h>
 123 #include <net/sock.h>
 124 #include <linux/net_tstamp.h>
 125 #include <net/xfrm.h>
 126 #include <linux/ipsec.h>
 127 #include <net/cls_cgroup.h>
 128
 129 #include <linux/filter.h>
 130
 131 #ifdef CONFIG_INET
 132 #include <net/tcp.h>
 133 #endif
 134
 135 /*
 136  * Each address family might have different locking rules, so we have
 137  * one slock key per address family:
 138  */
 139 static struct lock_class_key af_family_keys[AF_MAX];
 140 static struct lock_class_key af_family_slock_keys[AF_MAX];
 141
 142 /*
 143  * Make lock validator output more readable. (we pre-construct these
 144  * strings build-time, so that runtime initialization of socket
 145  * locks is fast):
 146  */
 147 static const char *const af_family_key_strings[AF_MAX+1] = {
 148   "sk_lock-AF_UNSPEC", "sk_lock-AF_UNIX"     , "sk_lock-AF_INET"     ,
 149   "sk_lock-AF_AX25"  , "sk_lock-AF_IPX"      , "sk_lock-AF_APPLETALK",
 150   "sk_lock-AF_NETROM", "sk_lock-AF_BRIDGE"   , "sk_lock-AF_ATMPVC"   ,
 151   "sk_lock-AF_X25"   , "sk_lock-AF_INET6"    , "sk_lock-AF_ROSE"     ,
 152   "sk_lock-AF_DECnet", "sk_lock-AF_NETBEUI"  , "sk_lock-AF_SECURITY" ,
 153   "sk_lock-AF_KEY"   , "sk_lock-AF_NETLINK"  , "sk_lock-AF_PACKET"   ,
 154   "sk_lock-AF_ASH"   , "sk_lock-AF_ECONET"   , "sk_lock-AF_ATMSVC"   ,
 155   "sk_lock-AF_RDS"   , "sk_lock-AF_SNA"      , "sk_lock-AF_IRDA"     ,
 156   "sk_lock-AF_PPPOX" , "sk_lock-AF_WANPIPE"  , "sk_lock-AF_LLC"      ,
 157   "sk_lock-27"       , "sk_lock-28"          , "sk_lock-AF_CAN"      ,
 158   "sk_lock-AF_TIPC"  , "sk_lock-AF_BLUETOOTH", "sk_lock-IUCV"        ,
 159   "sk_lock-AF_RXRPC" , "sk_lock-AF_ISDN"     , "sk_lock-AF_PHONET"   ,
 160   "sk_lock-AF_IEEE802154", "sk_lock-AF_CAIF" ,
 161   "sk_lock-AF_MAX"
 162 };
 163 static const char *const af_family_slock_key_strings[AF_MAX+1] = {
 164   "slock-AF_UNSPEC", "slock-AF_UNIX"     , "slock-AF_INET"     ,
 165   "slock-AF_AX25"  , "slock-AF_IPX"      , "slock-AF_APPLETALK",
 166   "slock-AF_NETROM", "slock-AF_BRIDGE"   , "slock-AF_ATMPVC"   ,
 167   "slock-AF_X25"   , "slock-AF_INET6"    , "slock-AF_ROSE"     ,
 168   "slock-AF_DECnet", "slock-AF_NETBEUI"  , "slock-AF_SECURITY" ,
 169   "slock-AF_KEY"   , "slock-AF_NETLINK"  , "slock-AF_PACKET"   ,
 170   "slock-AF_ASH"   , "slock-AF_ECONET"   , "slock-AF_ATMSVC"   ,
 171   "slock-AF_RDS"   , "slock-AF_SNA"      , "slock-AF_IRDA"     ,
 172   "slock-AF_PPPOX" , "slock-AF_WANPIPE"  , "slock-AF_LLC"      ,
 173   "slock-27"       , "slock-28"          , "slock-AF_CAN"      ,
 174   "slock-AF_TIPC"  , "slock-AF_BLUETOOTH", "slock-AF_IUCV"     ,
 175   "slock-AF_RXRPC" , "slock-AF_ISDN"     , "slock-AF_PHONET"   ,
 176   "slock-AF_IEEE802154", "slock-AF_CAIF" ,
 177   "slock-AF_MAX"
 178 };
 179 static const char *const af_family_clock_key_strings[AF_MAX+1] = {
 180   "clock-AF_UNSPEC", "clock-AF_UNIX"     , "clock-AF_INET"     ,
 181   "clock-AF_AX25"  , "clock-AF_IPX"      , "clock-AF_APPLETALK",
 182   "clock-AF_NETROM", "clock-AF_BRIDGE"   , "clock-AF_ATMPVC"   ,
 183   "clock-AF_X25"   , "clock-AF_INET6"    , "clock-AF_ROSE"     ,
 184   "clock-AF_DECnet", "clock-AF_NETBEUI"  , "clock-AF_SECURITY" ,
 185   "clock-AF_KEY"   , "clock-AF_NETLINK"  , "clock-AF_PACKET"   ,
 186   "clock-AF_ASH"   , "clock-AF_ECONET"   , "clock-AF_ATMSVC"   ,
 187   "clock-AF_RDS"   , "clock-AF_SNA"      , "clock-AF_IRDA"     ,
 188   "clock-AF_PPPOX" , "clock-AF_WANPIPE"  , "clock-AF_LLC"      ,
 189   "clock-27"       , "clock-28"          , "clock-AF_CAN"      ,
 190   "clock-AF_TIPC"  , "clock-AF_BLUETOOTH", "clock-AF_IUCV"     ,
 191   "clock-AF_RXRPC" , "clock-AF_ISDN"     , "clock-AF_PHONET"   ,
 192   "clock-AF_IEEE802154", "clock-AF_CAIF" ,
 193   "clock-AF_MAX"
 194 };
 195
 196 /*
 197  * sk_callback_lock locking rules are per-address-family,
 198  * so split the lock classes by using a per-AF key:
 199  */
 200 static struct lock_class_key af_callback_keys[AF_MAX];
 201
 202 /* Take into consideration the size of the struct sk_buff overhead in the
 203  * determination of these values, since that is non-constant across
 204  * platforms.  This makes socket queueing behavior and performance
 205  * not depend upon such differences.
 206  */
 207 #define _SK_MEM_PACKETS         256
 208 #define _SK_MEM_OVERHEAD        (sizeof(struct sk_buff) + 256)
 209 #define SK_WMEM_MAX             (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
 210 #define SK_RMEM_MAX             (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
 211
 212 /* Run time adjustable parameters. */
 213 __u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX;
 214 __u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX;
 215 __u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX;
 216 __u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX;
 217
 218 /* Maximal space eaten by iovec or ancilliary data plus some space */
 219 int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512);
 220 EXPORT_SYMBOL(sysctl_optmem_max);
 221
 222 #if defined(CONFIG_CGROUPS) && !defined(CONFIG_NET_CLS_CGROUP)
 223 int net_cls_subsys_id = -1;
 224 EXPORT_SYMBOL_GPL(net_cls_subsys_id);
 225 #endif
 226
 227 static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen)
 228 {
 229         struct timeval tv;
 230
 231         if (optlen < sizeof(tv))
 232                 return -EINVAL;
 233         if (copy_from_user(&tv, optval, sizeof(tv)))
 234                 return -EFAULT;
 235         if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC)
 236                 return -EDOM;
 237
 238         if (tv.tv_sec < 0) {
 239                 static int warned __read_mostly;
 240
 241                 *timeo_p = 0;
 242                 if (warned < 10 && net_ratelimit()) {
 243                         warned++;
 244                         printk(KERN_INFO "sock_set_timeout: `%s' (pid %d) "
 245                                "tries to set negative timeout\n",
 246                                 current->comm, task_pid_nr(current));
 247                 }
 248                 return 0;
 249         }
 250         *timeo_p = MAX_SCHEDULE_TIMEOUT;
 251         if (tv.tv_sec == 0 && tv.tv_usec == 0)
 252                 return 0;
 253         if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1))
 254                 *timeo_p = tv.tv_sec*HZ + (tv.tv_usec+(1000000/HZ-1))/(1000000/HZ);
 255         return 0;
 256 }
 257
 258 static void sock_warn_obsolete_bsdism(const char *name)
 259 {
 260         static int warned;
 261         static char warncomm[TASK_COMM_LEN];
 262         if (strcmp(warncomm, current->comm) && warned < 5) {
 263                 strcpy(warncomm,  current->comm);
 264                 printk(KERN_WARNING "process `%s' is using obsolete "
 265                        "%s SO_BSDCOMPAT\n", warncomm, name);
 266                 warned++;
 267         }
 268 }
 269
 270 static void sock_disable_timestamp(struct sock *sk, int flag)
 271 {
 272         if (sock_flag(sk, flag)) {
 273                 sock_reset_flag(sk, flag);
 274                 if (!sock_flag(sk, SOCK_TIMESTAMP) &&
 275                     !sock_flag(sk, SOCK_TIMESTAMPING_RX_SOFTWARE)) {
 276                         net_disable_timestamp();
 277                 }
 278         }
 279 }
 280
 281
 282 int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
 283 {
 284         int err;
 285         int skb_len;
 286         unsigned long flags;
 287         struct sk_buff_head *list = &sk->sk_receive_queue;
 288
 289         /* Cast sk->rcvbuf to unsigned... It's pointless, but reduces
 290            number of warnings when compiling with -W --ANK
 291          */
 292         if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >=
 293             (unsigned)sk->sk_rcvbuf) {
 294                 atomic_inc(&sk->sk_drops);
 295                 return -ENOMEM;
 296         }
 297
 298         err = sk_filter(sk, skb);
 299         if (err)
 300                 return err;
 301
 302         if (!sk_rmem_schedule(sk, skb->truesize)) {
 303                 atomic_inc(&sk->sk_drops);
 304                 return -ENOBUFS;
 305         }
 306
 307         skb->dev = NULL;
 308         skb_set_owner_r(skb, sk);
 309
 310         /* Cache the SKB length before we tack it onto the receive
 311          * queue.  Once it is added it no longer belongs to us and
 312          * may be freed by other threads of control pulling packets
 313          * from the queue.
 314          */
 315         skb_len = skb->len;
 316
 317         /* we escape from rcu protected region, make sure we dont leak
 318          * a norefcounted dst
 319          */
 320         skb_dst_force(skb);
 321
 322         spin_lock_irqsave(&list->lock, flags);
 323         skb->dropcount = atomic_read(&sk->sk_drops);
 324         __skb_queue_tail(list, skb);
 325         spin_unlock_irqrestore(&list->lock, flags);
 326
 327         if (!sock_flag(sk, SOCK_DEAD))
 328                 sk->sk_data_ready(sk, skb_len);
 329         return 0;
 330 }
 331 EXPORT_SYMBOL(sock_queue_rcv_skb);
 332
 333 int sk_receive_skb(struct sock *sk, struct sk_buff *skb, const int nested)
 334 {
 335         int rc = NET_RX_SUCCESS;
 336
 337         if (sk_filter(sk, skb))
 338                 goto discard_and_relse;
 339
 340         skb->dev = NULL;
 341
 342         if (sk_rcvqueues_full(sk, skb)) {
 343                 atomic_inc(&sk->sk_drops);
 344                 goto discard_and_relse;
 345         }
 346         if (nested)
 347                 bh_lock_sock_nested(sk);
 348         else
 349                 bh_lock_sock(sk);
 350         if (!sock_owned_by_user(sk)) {
 351                 /*
 352                  * trylock + unlock semantics:
 353                  */
 354                 mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_);
 355
 356                 rc = sk_backlog_rcv(sk, skb);
 357
 358                 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
 359         } else if (sk_add_backlog(sk, skb)) {
 360                 bh_unlock_sock(sk);
 361                 atomic_inc(&sk->sk_drops);
 362                 goto discard_and_relse;
 363         }
 364
 365         bh_unlock_sock(sk);
 366 out:
 367         sock_put(sk);
 368         return rc;
 369 discard_and_relse:
 370         kfree_skb(skb);
 371         goto out;
 372 }
 373 EXPORT_SYMBOL(sk_receive_skb);
 374
 375 void sk_reset_txq(struct sock *sk)
 376 {
 377         sk_tx_queue_clear(sk);
 378 }
 379 EXPORT_SYMBOL(sk_reset_txq);
 380
 381 struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie)
 382 {
 383         struct dst_entry *dst = __sk_dst_get(sk);
 384
 385         if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
 386                 sk_tx_queue_clear(sk);
 387                 rcu_assign_pointer(sk->sk_dst_cache, NULL);
 388                 dst_release(dst);
 389                 return NULL;
 390         }
 391
 392         return dst;
 393 }
 394 EXPORT_SYMBOL(__sk_dst_check);
 395
 396 struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie)
 397 {
 398         struct dst_entry *dst = sk_dst_get(sk);
 399
 400         if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
 401                 sk_dst_reset(sk);
 402                 dst_release(dst);
 403                 return NULL;
 404         }
 405
 406         return dst;
 407 }
 408 EXPORT_SYMBOL(sk_dst_check);
 409
 410 static int sock_bindtodevice(struct sock *sk, char __user *optval, int optlen)
 411 {
 412         int ret = -ENOPROTOOPT;
 413 #ifdef CONFIG_NETDEVICES
 414         struct net *net = sock_net(sk);
 415         char devname[IFNAMSIZ];
 416         int index;
 417
 418         /* Sorry... */
 419         ret = -EPERM;
 420         if (!capable(CAP_NET_RAW))
 421                 goto out;
 422
 423         ret = -EINVAL;
 424         if (optlen < 0)
 425                 goto out;
 426
 427         /* Bind this socket to a particular device like "eth0",
 428          * as specified in the passed interface name. If the
 429          * name is "" or the option length is zero the socket
 430          * is not bound.
 431          */
 432         if (optlen > IFNAMSIZ - 1)
 433                 optlen = IFNAMSIZ - 1;
 434         memset(devname, 0, sizeof(devname));
 435
 436         ret = -EFAULT;
 437         if (copy_from_user(devname, optval, optlen))
 438                 goto out;
 439
 440         index = 0;
 441         if (devname[0] != '\0') {
 442                 struct net_device *dev;
 443
 444                 rcu_read_lock();
 445                 dev = dev_get_by_name_rcu(net, devname);
 446                 if (dev)
 447                         index = dev->ifindex;
 448                 rcu_read_unlock();
 449                 ret = -ENODEV;
 450                 if (!dev)
 451                         goto out;
 452         }
 453
 454         lock_sock(sk);
 455         sk->sk_bound_dev_if = index;
 456         sk_dst_reset(sk);
 457         release_sock(sk);
 458
 459         ret = 0;
 460
 461 out:
 462 #endif
 463
 464         return ret;
 465 }
 466
 467 static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool)
 468 {
 469         if (valbool)
 470                 sock_set_flag(sk, bit);
 471         else
 472                 sock_reset_flag(sk, bit);
 473 }
 474
 475 /*
 476  *      This is meant for all protocols to use and covers goings on
 477  *      at the socket level. Everything here is generic.
 478  */
 479
 480 int sock_setsockopt(struct socket *sock, int level, int optname,
 481                     char __user *optval, unsigned int optlen)
 482 {
 483         struct sock *sk = sock->sk;
 484         int val;
 485         int valbool;
 486         struct linger ling;
 487         int ret = 0;
 488
 489         /*
 490          *      Options without arguments
 491          */
 492
 493         if (optname == SO_BINDTODEVICE)
 494                 return sock_bindtodevice(sk, optval, optlen);
 495
 496         if (optlen < sizeof(int))
 497                 return -EINVAL;
 498
 499         if (get_user(val, (int __user *)optval))
 500                 return -EFAULT;
 501
 502         valbool = val ? 1 : 0;
 503
 504         lock_sock(sk);
 505
 506         switch (optname) {
 507         case SO_DEBUG:
 508                 if (val && !capable(CAP_NET_ADMIN))
 509                         ret = -EACCES;
 510                 else
 511                         sock_valbool_flag(sk, SOCK_DBG, valbool);
 512                 break;
 513         case SO_REUSEADDR:
 514                 sk->sk_reuse = valbool;
 515                 break;
 516         case SO_TYPE:
 517         case SO_PROTOCOL:
 518         case SO_DOMAIN:
 519         case SO_ERROR:
 520                 ret = -ENOPROTOOPT;
 521                 break;
 522         case SO_DONTROUTE:
 523                 sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool);
 524                 break;
 525         case SO_BROADCAST:
 526                 sock_valbool_flag(sk, SOCK_BROADCAST, valbool);
 527                 break;
 528         case SO_SNDBUF:
 529                 /* Don't error on this BSD doesn't and if you think
 530                    about it this is right. Otherwise apps have to
 531                    play 'guess the biggest size' games. RCVBUF/SNDBUF
 532                    are treated in BSD as hints */
 533
 534                 if (val > sysctl_wmem_max)
 535                         val = sysctl_wmem_max;
 536 set_sndbuf:
 537                 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
 538                 if ((val * 2) < SOCK_MIN_SNDBUF)
 539                         sk->sk_sndbuf = SOCK_MIN_SNDBUF;
 540                 else
 541                         sk->sk_sndbuf = val * 2;
 542
 543                 /*
 544                  *      Wake up sending tasks if we
 545                  *      upped the value.
 546                  */
 547                 sk->sk_write_space(sk);
 548                 break;
 549
 550         case SO_SNDBUFFORCE:
 551                 if (!capable(CAP_NET_ADMIN)) {
 552                         ret = -EPERM;
 553                         break;
 554                 }
 555                 goto set_sndbuf;
 556
 557         case SO_RCVBUF:
 558                 /* Don't error on this BSD doesn't and if you think
 559                    about it this is right. Otherwise apps have to
 560                    play 'guess the biggest size' games. RCVBUF/SNDBUF
 561                    are treated in BSD as hints */
 562
 563                 if (val > sysctl_rmem_max)
 564                         val = sysctl_rmem_max;
 565 set_rcvbuf:
 566                 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
 567                 /*
 568                  * We double it on the way in to account for
 569                  * "struct sk_buff" etc. overhead.   Applications
 570                  * assume that the SO_RCVBUF setting they make will
 571                  * allow that much actual data to be received on that
 572                  * socket.
 573                  *
 574                  * Applications are unaware that "struct sk_buff" and
 575                  * other overheads allocate from the receive buffer
 576                  * during socket buffer allocation.
 577                  *
 578                  * And after considering the possible alternatives,
 579                  * returning the value we actually used in getsockopt
 580                  * is the most desirable behavior.
 581                  */
 582                 if ((val * 2) < SOCK_MIN_RCVBUF)
 583                         sk->sk_rcvbuf = SOCK_MIN_RCVBUF;
 584                 else
 585                         sk->sk_rcvbuf = val * 2;
 586                 break;
 587
 588         case SO_RCVBUFFORCE:
 589                 if (!capable(CAP_NET_ADMIN)) {
 590                         ret = -EPERM;
 591                         break;
 592                 }
 593                 goto set_rcvbuf;
 594
 595         case SO_KEEPALIVE:
 596 #ifdef CONFIG_INET
 597                 if (sk->sk_protocol == IPPROTO_TCP)
 598                         tcp_set_keepalive(sk, valbool);
 599 #endif
 600                 sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool);
 601                 break;
 602
 603         case SO_OOBINLINE:
 604                 sock_valbool_flag(sk, SOCK_URGINLINE, valbool);
 605                 break;
 606
 607         case SO_NO_CHECK:
 608                 sk->sk_no_check = valbool;
 609                 break;
 610
 611         case SO_PRIORITY:
 612                 if ((val >= 0 && val <= 6) || capable(CAP_NET_ADMIN))
 613                         sk->sk_priority = val;
 614                 else
 615                         ret = -EPERM;
 616                 break;
 617
 618         case SO_LINGER:
 619                 if (optlen < sizeof(ling)) {
 620                         ret = -EINVAL;  /* 1003.1g */
 621                         break;
 622                 }
 623                 if (copy_from_user(&ling, optval, sizeof(ling))) {
 624                         ret = -EFAULT;
 625                         break;
 626                 }
 627                 if (!ling.l_onoff)
 628                         sock_reset_flag(sk, SOCK_LINGER);
 629                 else {
 630 #if (BITS_PER_LONG == 32)
 631                         if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ)
 632                                 sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT;
 633                         else
 634 #endif
 635                                 sk->sk_lingertime = (unsigned int)ling.l_linger * HZ;
 636                         sock_set_flag(sk, SOCK_LINGER);
 637                 }
 638                 break;
 639
 640         case SO_BSDCOMPAT:
 641                 sock_warn_obsolete_bsdism("setsockopt");
 642                 break;
 643
 644         case SO_PASSCRED:
 645                 if (valbool)
 646                         set_bit(SOCK_PASSCRED, &sock->flags);
 647                 else
 648                         clear_bit(SOCK_PASSCRED, &sock->flags);
 649                 break;
 650
 651         case SO_TIMESTAMP:
 652         case SO_TIMESTAMPNS:
 653                 if (valbool)  {
 654                         if (optname == SO_TIMESTAMP)
 655                                 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
 656                         else
 657                                 sock_set_flag(sk, SOCK_RCVTSTAMPNS);
 658                         sock_set_flag(sk, SOCK_RCVTSTAMP);
 659                         sock_enable_timestamp(sk, SOCK_TIMESTAMP);
 660                 } else {
 661                         sock_reset_flag(sk, SOCK_RCVTSTAMP);
 662                         sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
 663                 }
 664                 break;
 665
 666         case SO_TIMESTAMPING:
 667                 if (val & ~SOF_TIMESTAMPING_MASK) {
 668                         ret = -EINVAL;
 669                         break;
 670                 }
 671                 sock_valbool_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE,
 672                                   val & SOF_TIMESTAMPING_TX_HARDWARE);
 673                 sock_valbool_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE,
 674                                   val & SOF_TIMESTAMPING_TX_SOFTWARE);
 675                 sock_valbool_flag(sk, SOCK_TIMESTAMPING_RX_HARDWARE,
 676                                   val & SOF_TIMESTAMPING_RX_HARDWARE);
 677                 if (val & SOF_TIMESTAMPING_RX_SOFTWARE)
 678                         sock_enable_timestamp(sk,
 679                                               SOCK_TIMESTAMPING_RX_SOFTWARE);
 680                 else
 681                         sock_disable_timestamp(sk,
 682                                                SOCK_TIMESTAMPING_RX_SOFTWARE);
 683                 sock_valbool_flag(sk, SOCK_TIMESTAMPING_SOFTWARE,
 684                                   val & SOF_TIMESTAMPING_SOFTWARE);
 685                 sock_valbool_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE,
 686                                   val & SOF_TIMESTAMPING_SYS_HARDWARE);
 687                 sock_valbool_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE,
 688                                   val & SOF_TIMESTAMPING_RAW_HARDWARE);
 689                 break;
 690
 691         case SO_RCVLOWAT:
 692                 if (val < 0)
 693                         val = INT_MAX;
 694                 sk->sk_rcvlowat = val ? : 1;
 695                 break;
 696
 697         case SO_RCVTIMEO:
 698                 ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen);
 699                 break;
 700
 701         case SO_SNDTIMEO:
 702                 ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen);
 703                 break;
 704
 705         case SO_ATTACH_FILTER:
 706                 ret = -EINVAL;
 707                 if (optlen == sizeof(struct sock_fprog)) {
 708                         struct sock_fprog fprog;
 709
 710                         ret = -EFAULT;
 711                         if (copy_from_user(&fprog, optval, sizeof(fprog)))
 712                                 break;
 713
 714                         ret = sk_attach_filter(&fprog, sk);
 715                 }
 716                 break;
 717
 718         case SO_DETACH_FILTER:
 719                 ret = sk_detach_filter(sk);
 720                 break;
 721
 722         case SO_PASSSEC:
 723                 if (valbool)
 724                         set_bit(SOCK_PASSSEC, &sock->flags);
 725                 else
 726                         clear_bit(SOCK_PASSSEC, &sock->flags);
 727                 break;
 728         case SO_MARK:
 729                 if (!capable(CAP_NET_ADMIN))
 730                         ret = -EPERM;
 731                 else
 732                         sk->sk_mark = val;
 733                 break;
 734
 735                 /* We implement the SO_SNDLOWAT etc to
 736                    not be settable (1003.1g 5.3) */
 737         case SO_RXQ_OVFL:
 738                 if (valbool)
 739                         sock_set_flag(sk, SOCK_RXQ_OVFL);
 740                 else
 741                         sock_reset_flag(sk, SOCK_RXQ_OVFL);
 742                 break;
 743         default:
 744                 ret = -ENOPROTOOPT;
 745                 break;
 746         }
 747         release_sock(sk);
 748         return ret;
 749 }
 750 EXPORT_SYMBOL(sock_setsockopt);
 751
 752
 753 void cred_to_ucred(struct pid *pid, const struct cred *cred,
 754                    struct ucred *ucred)
 755 {
 756         ucred->pid = pid_vnr(pid);
 757         ucred->uid = ucred->gid = -1;
 758         if (cred) {
 759                 struct user_namespace *current_ns = current_user_ns();
 760
 761                 ucred->uid = user_ns_map_uid(current_ns, cred, cred->euid);
 762                 ucred->gid = user_ns_map_gid(current_ns, cred, cred->egid);
 763         }
 764 }
 765 EXPORT_SYMBOL_GPL(cred_to_ucred);
 766
 767 int sock_getsockopt(struct socket *sock, int level, int optname,
 768                     char __user *optval, int __user *optlen)
 769 {
 770         struct sock *sk = sock->sk;
 771
 772         union {
 773                 int val;
 774                 struct linger ling;
 775                 struct timeval tm;
 776         } v;
 777
 778         int lv = sizeof(int);
 779         int len;
 780
 781         if (get_user(len, optlen))
 782                 return -EFAULT;
 783         if (len < 0)
 784                 return -EINVAL;
 785
 786         memset(&v, 0, sizeof(v));
 787
 788         switch (optname) {
 789         case SO_DEBUG:
 790                 v.val = sock_flag(sk, SOCK_DBG);
 791                 break;
 792
 793         case SO_DONTROUTE:
 794                 v.val = sock_flag(sk, SOCK_LOCALROUTE);
 795                 break;
 796
 797         case SO_BROADCAST:
 798                 v.val = !!sock_flag(sk, SOCK_BROADCAST);
 799                 break;
 800
 801         case SO_SNDBUF:
 802                 v.val = sk->sk_sndbuf;
 803                 break;
 804
 805         case SO_RCVBUF:
 806                 v.val = sk->sk_rcvbuf;
 807                 break;
 808
 809         case SO_REUSEADDR:
 810                 v.val = sk->sk_reuse;
 811                 break;
 812
 813         case SO_KEEPALIVE:
 814                 v.val = !!sock_flag(sk, SOCK_KEEPOPEN);
 815                 break;
 816
 817         case SO_TYPE:
 818                 v.val = sk->sk_type;
 819                 break;
 820
 821         case SO_PROTOCOL:
 822                 v.val = sk->sk_protocol;
 823                 break;
 824
 825         case SO_DOMAIN:
 826                 v.val = sk->sk_family;
 827                 break;
 828
 829         case SO_ERROR:
 830                 v.val = -sock_error(sk);
 831                 if (v.val == 0)
 832                         v.val = xchg(&sk->sk_err_soft, 0);
 833                 break;
 834
 835         case SO_OOBINLINE:
 836                 v.val = !!sock_flag(sk, SOCK_URGINLINE);
 837                 break;
 838
 839         case SO_NO_CHECK:
 840                 v.val = sk->sk_no_check;
 841                 break;
 842
 843         case SO_PRIORITY:
 844                 v.val = sk->sk_priority;
 845                 break;
 846
 847         case SO_LINGER:
 848                 lv              = sizeof(v.ling);
 849                 v.ling.l_onoff  = !!sock_flag(sk, SOCK_LINGER);
 850                 v.ling.l_linger = sk->sk_lingertime / HZ;
 851                 break;
 852
 853         case SO_BSDCOMPAT:
 854                 sock_warn_obsolete_bsdism("getsockopt");
 855                 break;
 856
 857         case SO_TIMESTAMP:
 858                 v.val = sock_flag(sk, SOCK_RCVTSTAMP) &&
 859                                 !sock_flag(sk, SOCK_RCVTSTAMPNS);
 860                 break;
 861
 862         case SO_TIMESTAMPNS:
 863                 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS);
 864                 break;
 865
 866         case SO_TIMESTAMPING:
 867                 v.val = 0;
 868                 if (sock_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE))
 869                         v.val |= SOF_TIMESTAMPING_TX_HARDWARE;
 870                 if (sock_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE))
 871                         v.val |= SOF_TIMESTAMPING_TX_SOFTWARE;
 872                 if (sock_flag(sk, SOCK_TIMESTAMPING_RX_HARDWARE))
 873                         v.val |= SOF_TIMESTAMPING_RX_HARDWARE;
 874                 if (sock_flag(sk, SOCK_TIMESTAMPING_RX_SOFTWARE))
 875                         v.val |= SOF_TIMESTAMPING_RX_SOFTWARE;
 876                 if (sock_flag(sk, SOCK_TIMESTAMPING_SOFTWARE))
 877                         v.val |= SOF_TIMESTAMPING_SOFTWARE;
 878                 if (sock_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE))
 879                         v.val |= SOF_TIMESTAMPING_SYS_HARDWARE;
 880                 if (sock_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE))
 881                         v.val |= SOF_TIMESTAMPING_RAW_HARDWARE;
 882                 break;
 883
 884         case SO_RCVTIMEO:
 885                 lv = sizeof(struct timeval);
 886                 if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) {
 887                         v.tm.tv_sec = 0;
 888                         v.tm.tv_usec = 0;
 889                 } else {
 890                         v.tm.tv_sec = sk->sk_rcvtimeo / HZ;
 891                         v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ;
 892                 }
 893                 break;
 894
 895         case SO_SNDTIMEO:
 896                 lv = sizeof(struct timeval);
 897                 if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) {
 898                         v.tm.tv_sec = 0;
 899                         v.tm.tv_usec = 0;
 900                 } else {
 901                         v.tm.tv_sec = sk->sk_sndtimeo / HZ;
 902                         v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ;
 903                 }
 904                 break;
 905
 906         case SO_RCVLOWAT:
 907                 v.val = sk->sk_rcvlowat;
 908                 break;
 909
 910         case SO_SNDLOWAT:
 911                 v.val = 1;
 912                 break;
 913
 914         case SO_PASSCRED:
 915                 v.val = test_bit(SOCK_PASSCRED, &sock->flags) ? 1 : 0;
 916                 break;
 917
 918         case SO_PEERCRED:
 919         {
 920                 struct ucred peercred;
 921                 if (len > sizeof(peercred))
 922                         len = sizeof(peercred);
 923                 cred_to_ucred(sk->sk_peer_pid, sk->sk_peer_cred, &peercred);
 924                 if (copy_to_user(optval, &peercred, len))
 925                         return -EFAULT;
 926                 goto lenout;
 927         }
 928
 929         case SO_PEERNAME:
 930         {
 931                 char address[128];
 932
 933                 if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2))
 934                         return -ENOTCONN;
 935                 if (lv < len)
 936                         return -EINVAL;
 937                 if (copy_to_user(optval, address, len))
 938                         return -EFAULT;
 939                 goto lenout;
 940         }
 941
 942         /* Dubious BSD thing... Probably nobody even uses it, but
 943          * the UNIX standard wants it for whatever reason... -DaveM
 944          */
 945         case SO_ACCEPTCONN:
 946                 v.val = sk->sk_state == TCP_LISTEN;
 947                 break;
 948
 949         case SO_PASSSEC:
 950                 v.val = test_bit(SOCK_PASSSEC, &sock->flags) ? 1 : 0;
 951                 break;
 952
 953         case SO_PEERSEC:
 954                 return security_socket_getpeersec_stream(sock, optval, optlen, len);
 955
 956         case SO_MARK:
 957                 v.val = sk->sk_mark;
 958                 break;
 959
 960         case SO_RXQ_OVFL:
 961                 v.val = !!sock_flag(sk, SOCK_RXQ_OVFL);
 962                 break;
 963
 964         default:
 965                 return -ENOPROTOOPT;
 966         }
 967
 968         if (len > lv)
 969                 len = lv;
 970         if (copy_to_user(optval, &v, len))
 971                 return -EFAULT;
 972 lenout:
 973         if (put_user(len, optlen))
 974                 return -EFAULT;
 975         return 0;
 976 }
 977
 978 /*
 979  * Initialize an sk_lock.
 980  *
 981  * (We also register the sk_lock with the lock validator.)
 982  */
 983 static inline void sock_lock_init(struct sock *sk)
 984 {
 985         sock_lock_init_class_and_name(sk,
 986                         af_family_slock_key_strings[sk->sk_family],
 987                         af_family_slock_keys + sk->sk_family,
 988                         af_family_key_strings[sk->sk_family],
 989                         af_family_keys + sk->sk_family);
 990 }
 991
 992 /*
 993  * Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet,
 994  * even temporarly, because of RCU lookups. sk_node should also be left as is.
 995  */
 996 static void sock_copy(struct sock *nsk, const struct sock *osk)
 997 {
 998 #ifdef CONFIG_SECURITY_NETWORK
 999         void *sptr = nsk->sk_security;
1000 #endif
1001         BUILD_BUG_ON(offsetof(struct sock, sk_copy_start) !=
1002                      sizeof(osk->sk_node) + sizeof(osk->sk_refcnt) +
1003                      sizeof(osk->sk_tx_queue_mapping));
1004         memcpy(&nsk->sk_copy_start, &osk->sk_copy_start,
1005                osk->sk_prot->obj_size - offsetof(struct sock, sk_copy_start));
1006 #ifdef CONFIG_SECURITY_NETWORK
1007         nsk->sk_security = sptr;
1008         security_sk_clone(osk, nsk);
1009 #endif
1010 }
1011
1012 static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority,
1013                 int family)
1014 {
1015         struct sock *sk;
1016         struct kmem_cache *slab;
1017
1018         slab = prot->slab;
1019         if (slab != NULL) {
1020                 sk = kmem_cache_alloc(slab, priority & ~__GFP_ZERO);
1021                 if (!sk)
1022                         return sk;
1023                 if (priority & __GFP_ZERO) {
1024                         /*
1025                          * caches using SLAB_DESTROY_BY_RCU should let
1026                          * sk_node.next un-modified. Special care is taken
1027                          * when initializing object to zero.
1028                          */
1029                         if (offsetof(struct sock, sk_node.next) != 0)
1030                                 memset(sk, 0, offsetof(struct sock, sk_node.next));
1031                         memset(&sk->sk_node.pprev, 0,
1032                                prot->obj_size - offsetof(struct sock,
1033                                                          sk_node.pprev));
1034                 }
1035         }
1036         else
1037                 sk = kmalloc(prot->obj_size, priority);
1038
1039         if (sk != NULL) {
1040                 kmemcheck_annotate_bitfield(sk, flags);
1041
1042                 if (security_sk_alloc(sk, family, priority))
1043                         goto out_free;
1044
1045                 if (!try_module_get(prot->owner))
1046                         goto out_free_sec;
1047                 sk_tx_queue_clear(sk);
1048         }
1049
1050         return sk;
1051
1052 out_free_sec:
1053         security_sk_free(sk);
1054 out_free:
1055         if (slab != NULL)
1056                 kmem_cache_free(slab, sk);
1057         else
1058                 kfree(sk);
1059         return NULL;
1060 }
1061
1062 static void sk_prot_free(struct proto *prot, struct sock *sk)
1063 {
1064         struct kmem_cache *slab;
1065         struct module *owner;
1066
1067         owner = prot->owner;
1068         slab = prot->slab;
1069
1070         security_sk_free(sk);
1071         if (slab != NULL)
1072                 kmem_cache_free(slab, sk);
1073         else
1074                 kfree(sk);
1075         module_put(owner);
1076 }
1077
1078 #ifdef CONFIG_CGROUPS
1079 void sock_update_classid(struct sock *sk)
1080 {
1081         u32 classid = task_cls_classid(current);
1082
1083         if (classid && classid != sk->sk_classid)
1084                 sk->sk_classid = classid;
1085 }
1086 EXPORT_SYMBOL(sock_update_classid);
1087 #endif
1088
1089 /**
1090  *      sk_alloc - All socket objects are allocated here
1091  *      @net: the applicable net namespace
1092  *      @family: protocol family
1093  *      @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1094  *      @prot: struct proto associated with this new sock instance
1095  */
1096 struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
1097                       struct proto *prot)
1098 {
1099         struct sock *sk;
1100
1101         sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family);
1102         if (sk) {
1103                 sk->sk_family = family;
1104                 /*
1105                  * See comment in struct sock definition to understand
1106                  * why we need sk_prot_creator -acme
1107                  */
1108                 sk->sk_prot = sk->sk_prot_creator = prot;
1109                 sock_lock_init(sk);
1110                 sock_net_set(sk, get_net(net));
1111                 atomic_set(&sk->sk_wmem_alloc, 1);
1112
1113                 sock_update_classid(sk);
1114         }
1115
1116         return sk;
1117 }
1118 EXPORT_SYMBOL(sk_alloc);
1119
1120 static void __sk_free(struct sock *sk)
1121 {
1122         struct sk_filter *filter;
1123
1124         if (sk->sk_destruct)
1125                 sk->sk_destruct(sk);
1126
1127         filter = rcu_dereference_check(sk->sk_filter,
1128                                        atomic_read(&sk->sk_wmem_alloc) == 0);
1129         if (filter) {
1130                 sk_filter_uncharge(sk, filter);
1131                 rcu_assign_pointer(sk->sk_filter, NULL);
1132         }
1133
1134         sock_disable_timestamp(sk, SOCK_TIMESTAMP);
1135         sock_disable_timestamp(sk, SOCK_TIMESTAMPING_RX_SOFTWARE);
1136
1137         if (atomic_read(&sk->sk_omem_alloc))
1138                 printk(KERN_DEBUG "%s: optmem leakage (%d bytes) detected.\n",
1139                        __func__, atomic_read(&sk->sk_omem_alloc));
1140
1141         if (sk->sk_peer_cred)
1142                 put_cred(sk->sk_peer_cred);
1143         put_pid(sk->sk_peer_pid);
1144         put_net(sock_net(sk));
1145         sk_prot_free(sk->sk_prot_creator, sk);
1146 }
1147
1148 void sk_free(struct sock *sk)
1149 {
1150         /*
1151          * We substract one from sk_wmem_alloc and can know if
1152          * some packets are still in some tx queue.
1153          * If not null, sock_wfree() will call __sk_free(sk) later
1154          */
1155         if (atomic_dec_and_test(&sk->sk_wmem_alloc))
1156                 __sk_free(sk);
1157 }
1158 EXPORT_SYMBOL(sk_free);
1159
1160 /*
1161  * Last sock_put should drop referrence to sk->sk_net. It has already
1162  * been dropped in sk_change_net. Taking referrence to stopping namespace
1163  * is not an option.
1164  * Take referrence to a socket to remove it from hash _alive_ and after that
1165  * destroy it in the context of init_net.
1166  */
1167 void sk_release_kernel(struct sock *sk)
1168 {
1169         if (sk == NULL || sk->sk_socket == NULL)
1170                 return;
1171
1172         sock_hold(sk);
1173         sock_release(sk->sk_socket);
1174         release_net(sock_net(sk));
1175         sock_net_set(sk, get_net(&init_net));
1176         sock_put(sk);
1177 }
1178 EXPORT_SYMBOL(sk_release_kernel);
1179
1180 struct sock *sk_clone(const struct sock *sk, const gfp_t priority)
1181 {
1182         struct sock *newsk;
1183
1184         newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family);
1185         if (newsk != NULL) {
1186                 struct sk_filter *filter;
1187
1188                 sock_copy(newsk, sk);
1189
1190                 /* SANITY */
1191                 get_net(sock_net(newsk));
1192                 sk_node_init(&newsk->sk_node);
1193                 sock_lock_init(newsk);
1194                 bh_lock_sock(newsk);
1195                 newsk->sk_backlog.head  = newsk->sk_backlog.tail = NULL;
1196                 newsk->sk_backlog.len = 0;
1197
1198                 atomic_set(&newsk->sk_rmem_alloc, 0);
1199                 /*
1200                  * sk_wmem_alloc set to one (see sk_free() and sock_wfree())
1201                  */
1202                 atomic_set(&newsk->sk_wmem_alloc, 1);
1203                 atomic_set(&newsk->sk_omem_alloc, 0);
1204                 skb_queue_head_init(&newsk->sk_receive_queue);
1205                 skb_queue_head_init(&newsk->sk_write_queue);
1206 #ifdef CONFIG_NET_DMA
1207                 skb_queue_head_init(&newsk->sk_async_wait_queue);
1208 #endif
1209
1210                 spin_lock_init(&newsk->sk_dst_lock);
1211                 rwlock_init(&newsk->sk_callback_lock);
1212                 lockdep_set_class_and_name(&newsk->sk_callback_lock,
1213                                 af_callback_keys + newsk->sk_family,
1214                                 af_family_clock_key_strings[newsk->sk_family]);
1215
1216                 newsk->sk_dst_cache     = NULL;
1217                 newsk->sk_wmem_queued   = 0;
1218                 newsk->sk_forward_alloc = 0;
1219                 newsk->sk_send_head     = NULL;
1220                 newsk->sk_userlocks     = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
1221
1222                 sock_reset_flag(newsk, SOCK_DONE);
1223                 skb_queue_head_init(&newsk->sk_error_queue);
1224
1225                 filter = newsk->sk_filter;
1226                 if (filter != NULL)
1227                         sk_filter_charge(newsk, filter);
1228
1229                 if (unlikely(xfrm_sk_clone_policy(newsk))) {
1230                         /* It is still raw copy of parent, so invalidate
1231                          * destructor and make plain sk_free() */
1232                         newsk->sk_destruct = NULL;
1233                         sk_free(newsk);
1234                         newsk = NULL;
1235                         goto out;
1236                 }
1237
1238                 newsk->sk_err      = 0;
1239                 newsk->sk_priority = 0;
1240                 /*
1241                  * Before updating sk_refcnt, we must commit prior changes to memory
1242                  * (Documentation/RCU/rculist_nulls.txt for details)
1243                  */
1244                 smp_wmb();
1245                 atomic_set(&newsk->sk_refcnt, 2);
1246
1247                 /*
1248                  * Increment the counter in the same struct proto as the master
1249                  * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
1250                  * is the same as sk->sk_prot->socks, as this field was copied
1251                  * with memcpy).
1252                  *
1253                  * This _changes_ the previous behaviour, where
1254                  * tcp_create_openreq_child always was incrementing the
1255                  * equivalent to tcp_prot->socks (inet_sock_nr), so this have
1256                  * to be taken into account in all callers. -acme
1257                  */
1258                 sk_refcnt_debug_inc(newsk);
1259                 sk_set_socket(newsk, NULL);
1260                 newsk->sk_wq = NULL;
1261
1262                 if (newsk->sk_prot->sockets_allocated)
1263                         percpu_counter_inc(newsk->sk_prot->sockets_allocated);
1264
1265                 if (sock_flag(newsk, SOCK_TIMESTAMP) ||
1266                     sock_flag(newsk, SOCK_TIMESTAMPING_RX_SOFTWARE))
1267                         net_enable_timestamp();
1268         }
1269 out:
1270         return newsk;
1271 }
1272 EXPORT_SYMBOL_GPL(sk_clone);
1273
1274 void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
1275 {
1276         __sk_dst_set(sk, dst);
1277         sk->sk_route_caps = dst->dev->features;
1278         if (sk->sk_route_caps & NETIF_F_GSO)
1279                 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE;
1280         sk->sk_route_caps &= ~sk->sk_route_nocaps;
1281         if (sk_can_gso(sk)) {
1282                 if (dst->header_len) {
1283                         sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
1284                 } else {
1285                         sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
1286                         sk->sk_gso_max_size = dst->dev->gso_max_size;
1287                 }
1288         }
1289 }
1290 EXPORT_SYMBOL_GPL(sk_setup_caps);
1291
1292 void __init sk_init(void)
1293 {
1294         if (totalram_pages <= 4096) {
1295                 sysctl_wmem_max = 32767;
1296                 sysctl_rmem_max = 32767;
1297                 sysctl_wmem_default = 32767;
1298                 sysctl_rmem_default = 32767;
1299         } else if (totalram_pages >= 131072) {
1300                 sysctl_wmem_max = 131071;
1301                 sysctl_rmem_max = 131071;
1302         }
1303 }
1304
1305 /*
1306  *      Simple resource managers for sockets.
1307  */
1308
1309
1310 /*
1311  * Write buffer destructor automatically called from kfree_skb.
1312  */
1313 void sock_wfree(struct sk_buff *skb)
1314 {
1315         struct sock *sk = skb->sk;
1316         unsigned int len = skb->truesize;
1317
1318         if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) {
1319                 /*
1320                  * Keep a reference on sk_wmem_alloc, this will be released
1321                  * after sk_write_space() call
1322                  */
1323                 atomic_sub(len - 1, &sk->sk_wmem_alloc);
1324                 sk->sk_write_space(sk);
1325                 len = 1;
1326         }
1327         /*
1328          * if sk_wmem_alloc reaches 0, we must finish what sk_free()
1329          * could not do because of in-flight packets
1330          */
1331         if (atomic_sub_and_test(len, &sk->sk_wmem_alloc))
1332                 __sk_free(sk);
1333 }
1334 EXPORT_SYMBOL(sock_wfree);
1335
1336 /*
1337  * Read buffer destructor automatically called from kfree_skb.
1338  */
1339 void sock_rfree(struct sk_buff *skb)
1340 {
1341         struct sock *sk = skb->sk;
1342         unsigned int len = skb->truesize;
1343
1344         atomic_sub(len, &sk->sk_rmem_alloc);
1345         sk_mem_uncharge(sk, len);
1346 }
1347 EXPORT_SYMBOL(sock_rfree);
1348
1349
1350 int sock_i_uid(struct sock *sk)
1351 {
1352         int uid;
1353
1354         read_lock_bh(&sk->sk_callback_lock);
1355         uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : 0;
1356         read_unlock_bh(&sk->sk_callback_lock);
1357         return uid;
1358 }
1359 EXPORT_SYMBOL(sock_i_uid);
1360
1361 unsigned long sock_i_ino(struct sock *sk)
1362 {
1363         unsigned long ino;
1364
1365         read_lock_bh(&sk->sk_callback_lock);
1366         ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
1367         read_unlock_bh(&sk->sk_callback_lock);
1368         return ino;
1369 }
1370 EXPORT_SYMBOL(sock_i_ino);
1371
1372 /*
1373  * Allocate a skb from the socket's send buffer.
1374  */
1375 struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
1376                              gfp_t priority)
1377 {
1378         if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
1379                 struct sk_buff *skb = alloc_skb(size, priority);
1380                 if (skb) {
1381                         skb_set_owner_w(skb, sk);
1382                         return skb;
1383                 }
1384         }
1385         return NULL;
1386 }
1387 EXPORT_SYMBOL(sock_wmalloc);
1388
1389 /*
1390  * Allocate a skb from the socket's receive buffer.
1391  */
1392 struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force,
1393                              gfp_t priority)
1394 {
1395         if (force || atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) {
1396                 struct sk_buff *skb = alloc_skb(size, priority);
1397                 if (skb) {
1398                         skb_set_owner_r(skb, sk);
1399                         return skb;
1400                 }
1401         }
1402         return NULL;
1403 }
1404
1405 /*
1406  * Allocate a memory block from the socket's option memory buffer.
1407  */
1408 void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
1409 {
1410         if ((unsigned)size <= sysctl_optmem_max &&
1411             atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) {
1412                 void *mem;
1413                 /* First do the add, to avoid the race if kmalloc
1414                  * might sleep.
1415                  */
1416                 atomic_add(size, &sk->sk_omem_alloc);
1417                 mem = kmalloc(size, priority);
1418                 if (mem)
1419                         return mem;
1420                 atomic_sub(size, &sk->sk_omem_alloc);
1421         }
1422         return NULL;
1423 }
1424 EXPORT_SYMBOL(sock_kmalloc);
1425
1426 /*
1427  * Free an option memory block.
1428  */
1429 void sock_kfree_s(struct sock *sk, void *mem, int size)
1430 {
1431         kfree(mem);
1432         atomic_sub(size, &sk->sk_omem_alloc);
1433 }
1434 EXPORT_SYMBOL(sock_kfree_s);
1435
1436 /* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
1437    I think, these locks should be removed for datagram sockets.
1438  */
1439 static long sock_wait_for_wmem(struct sock *sk, long timeo)
1440 {
1441         DEFINE_WAIT(wait);
1442
1443         clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1444         for (;;) {
1445                 if (!timeo)
1446                         break;
1447                 if (signal_pending(current))
1448                         break;
1449                 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1450                 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1451                 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf)
1452                         break;
1453                 if (sk->sk_shutdown & SEND_SHUTDOWN)
1454                         break;
1455                 if (sk->sk_err)
1456                         break;
1457                 timeo = schedule_timeout(timeo);
1458         }
1459         finish_wait(sk_sleep(sk), &wait);
1460         return timeo;
1461 }
1462
1463
1464 /*
1465  *      Generic send/receive buffer handlers
1466  */
1467
1468 struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len,
1469                                      unsigned long data_len, int noblock,
1470                                      int *errcode)
1471 {
1472         struct sk_buff *skb;
1473         gfp_t gfp_mask;
1474         long timeo;
1475         int err;
1476
1477         gfp_mask = sk->sk_allocation;
1478         if (gfp_mask & __GFP_WAIT)
1479                 gfp_mask |= __GFP_REPEAT;
1480
1481         timeo = sock_sndtimeo(sk, noblock);
1482         while (1) {
1483                 err = sock_error(sk);
1484                 if (err != 0)
1485                         goto failure;
1486
1487                 err = -EPIPE;
1488                 if (sk->sk_shutdown & SEND_SHUTDOWN)
1489                         goto failure;
1490
1491                 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
1492                         skb = alloc_skb(header_len, gfp_mask);
1493                         if (skb) {
1494                                 int npages;
1495                                 int i;
1496
1497                                 /* No pages, we're done... */
1498                                 if (!data_len)
1499                                         break;
1500
1501                                 npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
1502                                 skb->truesize += data_len;
1503                                 skb_shinfo(skb)->nr_frags = npages;
1504                                 for (i = 0; i < npages; i++) {
1505                                         struct page *page;
1506                                         skb_frag_t *frag;
1507
1508                                         page = alloc_pages(sk->sk_allocation, 0);
1509                                         if (!page) {
1510                                                 err = -ENOBUFS;
1511                                                 skb_shinfo(skb)->nr_frags = i;
1512                                                 kfree_skb(skb);
1513                                                 goto failure;
1514                                         }
1515
1516                                         frag = &skb_shinfo(skb)->frags[i];
1517                                         frag->page = page;
1518                                         frag->page_offset = 0;
1519                                         frag->size = (data_len >= PAGE_SIZE ?
1520                                                       PAGE_SIZE :
1521                                                       data_len);
1522                                         data_len -= PAGE_SIZE;
1523                                 }
1524
1525                                 /* Full success... */
1526                                 break;
1527                         }
1528                         err = -ENOBUFS;
1529                         goto failure;
1530                 }
1531                 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1532                 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1533                 err = -EAGAIN;
1534                 if (!timeo)
1535                         goto failure;
1536                 if (signal_pending(current))
1537                         goto interrupted;
1538                 timeo = sock_wait_for_wmem(sk, timeo);
1539         }
1540
1541         skb_set_owner_w(skb, sk);
1542         return skb;
1543
1544 interrupted:
1545         err = sock_intr_errno(timeo);
1546 failure:
1547         *errcode = err;
1548         return NULL;
1549 }
1550 EXPORT_SYMBOL(sock_alloc_send_pskb);
1551
1552 struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
1553                                     int noblock, int *errcode)
1554 {
1555         return sock_alloc_send_pskb(sk, size, 0, noblock, errcode);
1556 }
1557 EXPORT_SYMBOL(sock_alloc_send_skb);
1558
1559 static void __lock_sock(struct sock *sk)
1560         __releases(&sk->sk_lock.slock)
1561         __acquires(&sk->sk_lock.slock)
1562 {
1563         DEFINE_WAIT(wait);
1564
1565         for (;;) {
1566                 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
1567                                         TASK_UNINTERRUPTIBLE);
1568                 spin_unlock_bh(&sk->sk_lock.slock);
1569                 schedule();
1570                 spin_lock_bh(&sk->sk_lock.slock);
1571                 if (!sock_owned_by_user(sk))
1572                         break;
1573         }
1574         finish_wait(&sk->sk_lock.wq, &wait);
1575 }
1576
1577 static void __release_sock(struct sock *sk)
1578         __releases(&sk->sk_lock.slock)
1579         __acquires(&sk->sk_lock.slock)
1580 {
1581         struct sk_buff *skb = sk->sk_backlog.head;
1582
1583         do {
1584                 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
1585                 bh_unlock_sock(sk);
1586
1587                 do {
1588                         struct sk_buff *next = skb->next;
1589
1590                         WARN_ON_ONCE(skb_dst_is_noref(skb));
1591                         skb->next = NULL;
1592                         sk_backlog_rcv(sk, skb);
1593
1594                         /*
1595                          * We are in process context here with softirqs
1596                          * disabled, use cond_resched_softirq() to preempt.
1597                          * This is safe to do because we've taken the backlog
1598                          * queue private:
1599                          */
1600                         cond_resched_softirq();
1601
1602                         skb = next;
1603                 } while (skb != NULL);
1604
1605                 bh_lock_sock(sk);
1606         } while ((skb = sk->sk_backlog.head) != NULL);
1607
1608         /*
1609          * Doing the zeroing here guarantee we can not loop forever
1610          * while a wild producer attempts to flood us.
1611          */
1612         sk->sk_backlog.len = 0;
1613 }
1614
1615 /**
1616  * sk_wait_data - wait for data to arrive at sk_receive_queue
1617  * @sk:    sock to wait on
1618  * @timeo: for how long
1619  *
1620  * Now socket state including sk->sk_err is changed only under lock,
1621  * hence we may omit checks after joining wait queue.
1622  * We check receive queue before schedule() only as optimization;
1623  * it is very likely that release_sock() added new data.
1624  */
1625 int sk_wait_data(struct sock *sk, long *timeo)
1626 {
1627         int rc;
1628         DEFINE_WAIT(wait);
1629
1630         prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1631         set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1632         rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue));
1633         clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1634         finish_wait(sk_sleep(sk), &wait);
1635         return rc;
1636 }
1637 EXPORT_SYMBOL(sk_wait_data);
1638
1639 /**
1640  *      __sk_mem_schedule - increase sk_forward_alloc and memory_allocated
1641  *      @sk: socket
1642  *      @size: memory size to allocate
1643  *      @kind: allocation type
1644  *
1645  *      If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means
1646  *      rmem allocation. This function assumes that protocols which have
1647  *      memory_pressure use sk_wmem_queued as write buffer accounting.
1648  */
1649 int __sk_mem_schedule(struct sock *sk, int size, int kind)
1650 {
1651         struct proto *prot = sk->sk_prot;
1652         int amt = sk_mem_pages(size);
1653         int allocated;
1654
1655         sk->sk_forward_alloc += amt * SK_MEM_QUANTUM;
1656         allocated = atomic_add_return(amt, prot->memory_allocated);
1657
1658         /* Under limit. */
1659         if (allocated <= prot->sysctl_mem[0]) {
1660                 if (prot->memory_pressure && *prot->memory_pressure)
1661                         *prot->memory_pressure = 0;
1662                 return 1;
1663         }
1664
1665         /* Under pressure. */
1666         if (allocated > prot->sysctl_mem[1])
1667                 if (prot->enter_memory_pressure)
1668                         prot->enter_memory_pressure(sk);
1669
1670         /* Over hard limit. */
1671         if (allocated > prot->sysctl_mem[2])
1672                 goto suppress_allocation;
1673
1674         /* guarantee minimum buffer size under pressure */
1675         if (kind == SK_MEM_RECV) {
1676                 if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0])
1677                         return 1;
1678         } else { /* SK_MEM_SEND */
1679                 if (sk->sk_type == SOCK_STREAM) {
1680                         if (sk->sk_wmem_queued < prot->sysctl_wmem[0])
1681                                 return 1;
1682                 } else if (atomic_read(&sk->sk_wmem_alloc) <
1683                            prot->sysctl_wmem[0])
1684                                 return 1;
1685         }
1686
1687         if (prot->memory_pressure) {
1688                 int alloc;
1689
1690                 if (!*prot->memory_pressure)
1691                         return 1;
1692                 alloc = percpu_counter_read_positive(prot->sockets_allocated);
1693                 if (prot->sysctl_mem[2] > alloc *
1694                     sk_mem_pages(sk->sk_wmem_queued +
1695                                  atomic_read(&sk->sk_rmem_alloc) +
1696                                  sk->sk_forward_alloc))
1697                         return 1;
1698         }
1699
1700 suppress_allocation:
1701
1702         if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) {
1703                 sk_stream_moderate_sndbuf(sk);
1704
1705                 /* Fail only if socket is _under_ its sndbuf.
1706                  * In this case we cannot block, so that we have to fail.
1707                  */
1708                 if (sk->sk_wmem_queued + size >= sk->sk_sndbuf)
1709                         return 1;
1710         }
1711
1712         /* Alas. Undo changes. */
1713         sk->sk_forward_alloc -= amt * SK_MEM_QUANTUM;
1714         atomic_sub(amt, prot->memory_allocated);
1715         return 0;
1716 }
1717 EXPORT_SYMBOL(__sk_mem_schedule);
1718
1719 /**
1720  *      __sk_reclaim - reclaim memory_allocated
1721  *      @sk: socket
1722  */
1723 void __sk_mem_reclaim(struct sock *sk)
1724 {
1725         struct proto *prot = sk->sk_prot;
1726
1727         atomic_sub(sk->sk_forward_alloc >> SK_MEM_QUANTUM_SHIFT,
1728                    prot->memory_allocated);
1729         sk->sk_forward_alloc &= SK_MEM_QUANTUM - 1;
1730
1731         if (prot->memory_pressure && *prot->memory_pressure &&
1732             (atomic_read(prot->memory_allocated) < prot->sysctl_mem[0]))
1733                 *prot->memory_pressure = 0;
1734 }
1735 EXPORT_SYMBOL(__sk_mem_reclaim);
1736
1737
1738 /*
1739  * Set of default routines for initialising struct proto_ops when
1740  * the protocol does not support a particular function. In certain
1741  * cases where it makes no sense for a protocol to have a "do nothing"
1742  * function, some default processing is provided.
1743  */
1744
1745 int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
1746 {
1747         return -EOPNOTSUPP;
1748 }
1749 EXPORT_SYMBOL(sock_no_bind);
1750
1751 int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
1752                     int len, int flags)
1753 {
1754         return -EOPNOTSUPP;
1755 }
1756 EXPORT_SYMBOL(sock_no_connect);
1757
1758 int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
1759 {
1760         return -EOPNOTSUPP;
1761 }
1762 EXPORT_SYMBOL(sock_no_socketpair);
1763
1764 int sock_no_accept(struct socket *sock, struct socket *newsock, int flags)
1765 {
1766         return -EOPNOTSUPP;
1767 }
1768 EXPORT_SYMBOL(sock_no_accept);
1769
1770 int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
1771                     int *len, int peer)
1772 {
1773         return -EOPNOTSUPP;
1774 }
1775 EXPORT_SYMBOL(sock_no_getname);
1776
1777 unsigned int sock_no_poll(struct file *file, struct socket *sock, poll_table *pt)
1778 {
1779         return 0;
1780 }
1781 EXPORT_SYMBOL(sock_no_poll);
1782
1783 int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1784 {
1785         return -EOPNOTSUPP;
1786 }
1787 EXPORT_SYMBOL(sock_no_ioctl);
1788
1789 int sock_no_listen(struct socket *sock, int backlog)
1790 {
1791         return -EOPNOTSUPP;
1792 }
1793 EXPORT_SYMBOL(sock_no_listen);
1794
1795 int sock_no_shutdown(struct socket *sock, int how)
1796 {
1797         return -EOPNOTSUPP;
1798 }
1799 EXPORT_SYMBOL(sock_no_shutdown);
1800
1801 int sock_no_setsockopt(struct socket *sock, int level, int optname,
1802                     char __user *optval, unsigned int optlen)
1803 {
1804         return -EOPNOTSUPP;
1805 }
1806 EXPORT_SYMBOL(sock_no_setsockopt);
1807
1808 int sock_no_getsockopt(struct socket *sock, int level, int optname,
1809                     char __user *optval, int __user *optlen)
1810 {
1811         return -EOPNOTSUPP;
1812 }
1813 EXPORT_SYMBOL(sock_no_getsockopt);
1814
1815 int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
1816                     size_t len)
1817 {
1818         return -EOPNOTSUPP;
1819 }
1820 EXPORT_SYMBOL(sock_no_sendmsg);
1821
1822 int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
1823                     size_t len, int flags)
1824 {
1825         return -EOPNOTSUPP;
1826 }
1827 EXPORT_SYMBOL(sock_no_recvmsg);
1828
1829 int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
1830 {
1831         /* Mirror missing mmap method error code */
1832         return -ENODEV;
1833 }
1834 EXPORT_SYMBOL(sock_no_mmap);
1835
1836 ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
1837 {
1838         ssize_t res;
1839         struct msghdr msg = {.msg_flags = flags};
1840         struct kvec iov;
1841         char *kaddr = kmap(page);
1842         iov.iov_base = kaddr + offset;
1843         iov.iov_len = size;
1844         res = kernel_sendmsg(sock, &msg, &iov, 1, size);
1845         kunmap(page);
1846         return res;
1847 }
1848 EXPORT_SYMBOL(sock_no_sendpage);
1849
1850 /*
1851  *      Default Socket Callbacks
1852  */
1853
1854 static void sock_def_wakeup(struct sock *sk)
1855 {
1856         struct socket_wq *wq;
1857
1858         rcu_read_lock();
1859         wq = rcu_dereference(sk->sk_wq);
1860         if (wq_has_sleeper(wq))
1861                 wake_up_interruptible_all(&wq->wait);
1862         rcu_read_unlock();
1863 }
1864
1865 static void sock_def_error_report(struct sock *sk)
1866 {
1867         struct socket_wq *wq;
1868
1869         rcu_read_lock();
1870         wq = rcu_dereference(sk->sk_wq);
1871         if (wq_has_sleeper(wq))
1872                 wake_up_interruptible_poll(&wq->wait, POLLERR);
1873         sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR);
1874         rcu_read_unlock();
1875 }
1876
1877 static void sock_def_readable(struct sock *sk, int len)
1878 {
1879         struct socket_wq *wq;
1880
1881         rcu_read_lock();
1882         wq = rcu_dereference(sk->sk_wq);
1883         if (wq_has_sleeper(wq))
1884                 wake_up_interruptible_sync_poll(&wq->wait, POLLIN |
1885                                                 POLLRDNORM | POLLRDBAND);
1886         sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
1887         rcu_read_unlock();
1888 }
1889
1890 static void sock_def_write_space(struct sock *sk)
1891 {
1892         struct socket_wq *wq;
1893
1894         rcu_read_lock();
1895
1896         /* Do not wake up a writer until he can make "significant"
1897          * progress.  --DaveM
1898          */
1899         if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) {
1900                 wq = rcu_dereference(sk->sk_wq);
1901                 if (wq_has_sleeper(wq))
1902                         wake_up_interruptible_sync_poll(&wq->wait, POLLOUT |
1903                                                 POLLWRNORM | POLLWRBAND);
1904
1905                 /* Should agree with poll, otherwise some programs break */
1906                 if (sock_writeable(sk))
1907                         sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
1908         }
1909
1910         rcu_read_unlock();
1911 }
1912
1913 static void sock_def_destruct(struct sock *sk)
1914 {
1915         kfree(sk->sk_protinfo);
1916 }
1917
1918 void sk_send_sigurg(struct sock *sk)
1919 {
1920         if (sk->sk_socket && sk->sk_socket->file)
1921                 if (send_sigurg(&sk->sk_socket->file->f_owner))
1922                         sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI);
1923 }
1924 EXPORT_SYMBOL(sk_send_sigurg);
1925
1926 void sk_reset_timer(struct sock *sk, struct timer_list* timer,
1927                     unsigned long expires)
1928 {
1929         if (!mod_timer(timer, expires))
1930                 sock_hold(sk);
1931 }
1932 EXPORT_SYMBOL(sk_reset_timer);
1933
1934 void sk_stop_timer(struct sock *sk, struct timer_list* timer)
1935 {
1936         if (timer_pending(timer) && del_timer(timer))
1937                 __sock_put(sk);
1938 }
1939 EXPORT_SYMBOL(sk_stop_timer);
1940
1941 void sock_init_data(struct socket *sock, struct sock *sk)
1942 {
1943         skb_queue_head_init(&sk->sk_receive_queue);
1944         skb_queue_head_init(&sk->sk_write_queue);
1945         skb_queue_head_init(&sk->sk_error_queue);
1946 #ifdef CONFIG_NET_DMA
1947         skb_queue_head_init(&sk->sk_async_wait_queue);
1948 #endif
1949
1950         sk->sk_send_head        =       NULL;
1951
1952         init_timer(&sk->sk_timer);
1953
1954         sk->sk_allocation       =       GFP_KERNEL;
1955         sk->sk_rcvbuf           =       sysctl_rmem_default;
1956         sk->sk_sndbuf           =       sysctl_wmem_default;
1957         sk->sk_state            =       TCP_CLOSE;
1958         sk_set_socket(sk, sock);
1959
1960         sock_set_flag(sk, SOCK_ZAPPED);
1961
1962         if (sock) {
1963                 sk->sk_type     =       sock->type;
1964                 sk->sk_wq       =       sock->wq;
1965                 sock->sk        =       sk;
1966         } else
1967                 sk->sk_wq       =       NULL;
1968
1969         spin_lock_init(&sk->sk_dst_lock);
1970         rwlock_init(&sk->sk_callback_lock);
1971         lockdep_set_class_and_name(&sk->sk_callback_lock,
1972                         af_callback_keys + sk->sk_family,
1973                         af_family_clock_key_strings[sk->sk_family]);
1974
1975         sk->sk_state_change     =       sock_def_wakeup;
1976         sk->sk_data_ready       =       sock_def_readable;
1977         sk->sk_write_space      =       sock_def_write_space;
1978         sk->sk_error_report     =       sock_def_error_report;
1979         sk->sk_destruct         =       sock_def_destruct;
1980
1981         sk->sk_sndmsg_page      =       NULL;
1982         sk->sk_sndmsg_off       =       0;
1983
1984         sk->sk_peer_pid         =       NULL;
1985         sk->sk_peer_cred        =       NULL;
1986         sk->sk_write_pending    =       0;
1987         sk->sk_rcvlowat         =       1;
1988         sk->sk_rcvtimeo         =       MAX_SCHEDULE_TIMEOUT;
1989         sk->sk_sndtimeo         =       MAX_SCHEDULE_TIMEOUT;
1990
1991         sk->sk_stamp = ktime_set(-1L, 0);
1992
1993         /*
1994          * Before updating sk_refcnt, we must commit prior changes to memory
1995          * (Documentation/RCU/rculist_nulls.txt for details)
1996          */
1997         smp_wmb();
1998         atomic_set(&sk->sk_refcnt, 1);
1999         atomic_set(&sk->sk_drops, 0);
2000 }
2001 EXPORT_SYMBOL(sock_init_data);
2002
2003 void lock_sock_nested(struct sock *sk, int subclass)
2004 {
2005         might_sleep();
2006         spin_lock_bh(&sk->sk_lock.slock);
2007         if (sk->sk_lock.owned)
2008                 __lock_sock(sk);
2009         sk->sk_lock.owned = 1;
2010         spin_unlock(&sk->sk_lock.slock);
2011         /*
2012          * The sk_lock has mutex_lock() semantics here:
2013          */
2014         mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
2015         local_bh_enable();
2016 }
2017 EXPORT_SYMBOL(lock_sock_nested);
2018
2019 void release_sock(struct sock *sk)
2020 {
2021         /*
2022          * The sk_lock has mutex_unlock() semantics:
2023          */
2024         mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
2025
2026         spin_lock_bh(&sk->sk_lock.slock);
2027         if (sk->sk_backlog.tail)
2028                 __release_sock(sk);
2029         sk->sk_lock.owned = 0;
2030         if (waitqueue_active(&sk->sk_lock.wq))
2031                 wake_up(&sk->sk_lock.wq);
2032         spin_unlock_bh(&sk->sk_lock.slock);
2033 }
2034 EXPORT_SYMBOL(release_sock);
2035
2036 /**
2037  * lock_sock_fast - fast version of lock_sock
2038  * @sk: socket
2039  *
2040  * This version should be used for very small section, where process wont block
2041  * return false if fast path is taken
2042  *   sk_lock.slock locked, owned = 0, BH disabled
2043  * return true if slow path is taken
2044  *   sk_lock.slock unlocked, owned = 1, BH enabled
2045  */
2046 bool lock_sock_fast(struct sock *sk)
2047 {
2048         might_sleep();
2049         spin_lock_bh(&sk->sk_lock.slock);
2050
2051         if (!sk->sk_lock.owned)
2052                 /*
2053                  * Note : We must disable BH
2054                  */
2055                 return false;
2056
2057         __lock_sock(sk);
2058         sk->sk_lock.owned = 1;
2059         spin_unlock(&sk->sk_lock.slock);
2060         /*
2061          * The sk_lock has mutex_lock() semantics here:
2062          */
2063         mutex_acquire(&sk->sk_lock.dep_map, 0, 0, _RET_IP_);
2064         local_bh_enable();
2065         return true;
2066 }
2067 EXPORT_SYMBOL(lock_sock_fast);
2068
2069 int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
2070 {
2071         struct timeval tv;
2072         if (!sock_flag(sk, SOCK_TIMESTAMP))
2073                 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
2074         tv = ktime_to_timeval(sk->sk_stamp);
2075         if (tv.tv_sec == -1)
2076                 return -ENOENT;
2077         if (tv.tv_sec == 0) {
2078                 sk->sk_stamp = ktime_get_real();
2079                 tv = ktime_to_timeval(sk->sk_stamp);
2080         }
2081         return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0;
2082 }
2083 EXPORT_SYMBOL(sock_get_timestamp);
2084
2085 int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
2086 {
2087         struct timespec ts;
2088         if (!sock_flag(sk, SOCK_TIMESTAMP))
2089                 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
2090         ts = ktime_to_timespec(sk->sk_stamp);
2091         if (ts.tv_sec == -1)
2092                 return -ENOENT;
2093         if (ts.tv_sec == 0) {
2094                 sk->sk_stamp = ktime_get_real();
2095                 ts = ktime_to_timespec(sk->sk_stamp);
2096         }
2097         return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0;
2098 }
2099 EXPORT_SYMBOL(sock_get_timestampns);
2100
2101 void sock_enable_timestamp(struct sock *sk, int flag)
2102 {
2103         if (!sock_flag(sk, flag)) {
2104                 sock_set_flag(sk, flag);
2105                 /*
2106                  * we just set one of the two flags which require net
2107                  * time stamping, but time stamping might have been on
2108                  * already because of the other one
2109                  */
2110                 if (!sock_flag(sk,
2111                                 flag == SOCK_TIMESTAMP ?
2112                                 SOCK_TIMESTAMPING_RX_SOFTWARE :
2113                                 SOCK_TIMESTAMP))
2114                         net_enable_timestamp();
2115         }
2116 }
2117
2118 /*
2119  *      Get a socket option on an socket.
2120  *
2121  *      FIX: POSIX 1003.1g is very ambiguous here. It states that
2122  *      asynchronous errors should be reported by getsockopt. We assume
2123  *      this means if you specify SO_ERROR (otherwise whats the point of it).
2124  */
2125 int sock_common_getsockopt(struct socket *sock, int level, int optname,
2126                            char __user *optval, int __user *optlen)
2127 {
2128         struct sock *sk = sock->sk;
2129
2130         return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2131 }
2132 EXPORT_SYMBOL(sock_common_getsockopt);
2133
2134 #ifdef CONFIG_COMPAT
2135 int compat_sock_common_getsockopt(struct socket *sock, int level, int optname,
2136                                   char __user *optval, int __user *optlen)
2137 {
2138         struct sock *sk = sock->sk;
2139
2140         if (sk->sk_prot->compat_getsockopt != NULL)
2141                 return sk->sk_prot->compat_getsockopt(sk, level, optname,
2142                                                       optval, optlen);
2143         return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2144 }
2145 EXPORT_SYMBOL(compat_sock_common_getsockopt);
2146 #endif
2147
2148 int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock,
2149                         struct msghdr *msg, size_t size, int flags)
2150 {
2151         struct sock *sk = sock->sk;
2152         int addr_len = 0;
2153         int err;
2154
2155         err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT,
2156                                    flags & ~MSG_DONTWAIT, &addr_len);
2157         if (err >= 0)
2158                 msg->msg_namelen = addr_len;
2159         return err;
2160 }
2161 EXPORT_SYMBOL(sock_common_recvmsg);
2162
2163 /*
2164  *      Set socket options on an inet socket.
2165  */
2166 int sock_common_setsockopt(struct socket *sock, int level, int optname,
2167                            char __user *optval, unsigned int optlen)
2168 {
2169         struct sock *sk = sock->sk;
2170
2171         return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2172 }
2173 EXPORT_SYMBOL(sock_common_setsockopt);
2174
2175 #ifdef CONFIG_COMPAT
2176 int compat_sock_common_setsockopt(struct socket *sock, int level, int optname,
2177                                   char __user *optval, unsigned int optlen)
2178 {
2179         struct sock *sk = sock->sk;
2180
2181         if (sk->sk_prot->compat_setsockopt != NULL)
2182                 return sk->sk_prot->compat_setsockopt(sk, level, optname,
2183                                                       optval, optlen);
2184         return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2185 }
2186 EXPORT_SYMBOL(compat_sock_common_setsockopt);
2187 #endif
2188
2189 void sk_common_release(struct sock *sk)
2190 {
2191         if (sk->sk_prot->destroy)
2192                 sk->sk_prot->destroy(sk);
2193
2194         /*
2195          * Observation: when sock_common_release is called, processes have
2196          * no access to socket. But net still has.
2197          * Step one, detach it from networking:
2198          *
2199          * A. Remove from hash tables.
2200          */
2201
2202         sk->sk_prot->unhash(sk);
2203
2204         /*
2205          * In this point socket cannot receive new packets, but it is possible
2206          * that some packets are in flight because some CPU runs receiver and
2207          * did hash table lookup before we unhashed socket. They will achieve
2208          * receive queue and will be purged by socket destructor.
2209          *
2210          * Also we still have packets pending on receive queue and probably,
2211          * our own packets waiting in device queues. sock_destroy will drain
2212          * receive queue, but transmitted packets will delay socket destruction
2213          * until the last reference will be released.
2214          */
2215
2216         sock_orphan(sk);
2217
2218         xfrm_sk_free_policy(sk);
2219
2220         sk_refcnt_debug_release(sk);
2221         sock_put(sk);
2222 }
2223 EXPORT_SYMBOL(sk_common_release);
2224
2225 static DEFINE_RWLOCK(proto_list_lock);
2226 static LIST_HEAD(proto_list);
2227
2228 #ifdef CONFIG_PROC_FS
2229 #define PROTO_INUSE_NR  64      /* should be enough for the first time */
2230 struct prot_inuse {
2231         int val[PROTO_INUSE_NR];
2232 };
2233
2234 static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR);
2235
2236 #ifdef CONFIG_NET_NS
2237 void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
2238 {
2239         __this_cpu_add(net->core.inuse->val[prot->inuse_idx], val);
2240 }
2241 EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2242
2243 int sock_prot_inuse_get(struct net *net, struct proto *prot)
2244 {
2245         int cpu, idx = prot->inuse_idx;
2246         int res = 0;
2247
2248         for_each_possible_cpu(cpu)
2249                 res += per_cpu_ptr(net->core.inuse, cpu)->val[idx];
2250
2251         return res >= 0 ? res : 0;
2252 }
2253 EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
2254
2255 static int __net_init sock_inuse_init_net(struct net *net)
2256 {
2257         net->core.inuse = alloc_percpu(struct prot_inuse);
2258         return net->core.inuse ? 0 : -ENOMEM;
2259 }
2260
2261 static void __net_exit sock_inuse_exit_net(struct net *net)
2262 {
2263         free_percpu(net->core.inuse);
2264 }
2265
2266 static struct pernet_operations net_inuse_ops = {
2267         .init = sock_inuse_init_net,
2268         .exit = sock_inuse_exit_net,
2269 };
2270
2271 static __init int net_inuse_init(void)
2272 {
2273         if (register_pernet_subsys(&net_inuse_ops))
2274                 panic("Cannot initialize net inuse counters");
2275
2276         return 0;
2277 }
2278
2279 core_initcall(net_inuse_init);
2280 #else
2281 static DEFINE_PER_CPU(struct prot_inuse, prot_inuse);
2282
2283 void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
2284 {
2285         __this_cpu_add(prot_inuse.val[prot->inuse_idx], val);
2286 }
2287 EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2288
2289 int sock_prot_inuse_get(struct net *net, struct proto *prot)
2290 {
2291         int cpu, idx = prot->inuse_idx;
2292         int res = 0;
2293
2294         for_each_possible_cpu(cpu)
2295                 res += per_cpu(prot_inuse, cpu).val[idx];
2296
2297         return res >= 0 ? res : 0;
2298 }
2299 EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
2300 #endif
2301
2302 static void assign_proto_idx(struct proto *prot)
2303 {
2304         prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR);
2305
2306         if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) {
2307                 printk(KERN_ERR "PROTO_INUSE_NR exhausted\n");
2308                 return;
2309         }
2310
2311         set_bit(prot->inuse_idx, proto_inuse_idx);
2312 }
2313
2314 static void release_proto_idx(struct proto *prot)
2315 {
2316         if (prot->inuse_idx != PROTO_INUSE_NR - 1)
2317                 clear_bit(prot->inuse_idx, proto_inuse_idx);
2318 }
2319 #else
2320 static inline void assign_proto_idx(struct proto *prot)
2321 {
2322 }
2323
2324 static inline void release_proto_idx(struct proto *prot)
2325 {
2326 }
2327 #endif
2328
2329 int proto_register(struct proto *prot, int alloc_slab)
2330 {
2331         if (alloc_slab) {
2332                 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0,
2333                                         SLAB_HWCACHE_ALIGN | prot->slab_flags,
2334                                         NULL);
2335
2336                 if (prot->slab == NULL) {
2337                         printk(KERN_CRIT "%s: Can't create sock SLAB cache!\n",
2338                                prot->name);
2339                         goto out;
2340                 }
2341
2342                 if (prot->rsk_prot != NULL) {
2343                         prot->rsk_prot->slab_name = kasprintf(GFP_KERNEL, "request_sock_%s", prot->name);
2344                         if (prot->rsk_prot->slab_name == NULL)
2345                                 goto out_free_sock_slab;
2346
2347                         prot->rsk_prot->slab = kmem_cache_create(prot->rsk_prot->slab_name,
2348                                                                  prot->rsk_prot->obj_size, 0,
2349                                                                  SLAB_HWCACHE_ALIGN, NULL);
2350
2351                         if (prot->rsk_prot->slab == NULL) {
2352                                 printk(KERN_CRIT "%s: Can't create request sock SLAB cache!\n",
2353                                        prot->name);
2354                                 goto out_free_request_sock_slab_name;
2355                         }
2356                 }
2357
2358                 if (prot->twsk_prot != NULL) {
2359                         prot->twsk_prot->twsk_slab_name = kasprintf(GFP_KERNEL, "tw_sock_%s", prot->name);
2360
2361                         if (prot->twsk_prot->twsk_slab_name == NULL)
2362                                 goto out_free_request_sock_slab;
2363
2364                         prot->twsk_prot->twsk_slab =
2365                                 kmem_cache_create(prot->twsk_prot->twsk_slab_name,
2366                                                   prot->twsk_prot->twsk_obj_size,
2367                                                   0,
2368                                                   SLAB_HWCACHE_ALIGN |
2369                                                         prot->slab_flags,
2370                                                   NULL);
2371                         if (prot->twsk_prot->twsk_slab == NULL)
2372                                 goto out_free_timewait_sock_slab_name;
2373                 }
2374         }
2375
2376         write_lock(&proto_list_lock);
2377         list_add(&prot->node, &proto_list);
2378         assign_proto_idx(prot);
2379         write_unlock(&proto_list_lock);
2380         return 0;
2381
2382 out_free_timewait_sock_slab_name:
2383         kfree(prot->twsk_prot->twsk_slab_name);
2384 out_free_request_sock_slab:
2385         if (prot->rsk_prot && prot->rsk_prot->slab) {
2386                 kmem_cache_destroy(prot->rsk_prot->slab);
2387                 prot->rsk_prot->slab = NULL;
2388         }
2389 out_free_request_sock_slab_name:
2390         if (prot->rsk_prot)
2391                 kfree(prot->rsk_prot->slab_name);
2392 out_free_sock_slab:
2393         kmem_cache_destroy(prot->slab);
2394         prot->slab = NULL;
2395 out:
2396         return -ENOBUFS;
2397 }
2398 EXPORT_SYMBOL(proto_register);
2399
2400 void proto_unregister(struct proto *prot)
2401 {
2402         write_lock(&proto_list_lock);
2403         release_proto_idx(prot);
2404         list_del(&prot->node);
2405         write_unlock(&proto_list_lock);
2406
2407         if (prot->slab != NULL) {
2408                 kmem_cache_destroy(prot->slab);
2409                 prot->slab = NULL;
2410         }
2411
2412         if (prot->rsk_prot != NULL && prot->rsk_prot->slab != NULL) {
2413                 kmem_cache_destroy(prot->rsk_prot->slab);
2414                 kfree(prot->rsk_prot->slab_name);
2415                 prot->rsk_prot->slab = NULL;
2416         }
2417
2418         if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) {
2419                 kmem_cache_destroy(prot->twsk_prot->twsk_slab);
2420                 kfree(prot->twsk_prot->twsk_slab_name);
2421                 prot->twsk_prot->twsk_slab = NULL;
2422         }
2423 }
2424 EXPORT_SYMBOL(proto_unregister);
2425
2426 #ifdef CONFIG_PROC_FS
2427 static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
2428         __acquires(proto_list_lock)
2429 {
2430         read_lock(&proto_list_lock);
2431         return seq_list_start_head(&proto_list, *pos);
2432 }
2433
2434 static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2435 {
2436         return seq_list_next(v, &proto_list, pos);
2437 }
2438
2439 static void proto_seq_stop(struct seq_file *seq, void *v)
2440         __releases(proto_list_lock)
2441 {
2442         read_unlock(&proto_list_lock);
2443 }
2444
2445 static char proto_method_implemented(const void *method)
2446 {
2447         return method == NULL ? 'n' : 'y';
2448 }
2449
2450 static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
2451 {
2452         seq_printf(seq, "%-9s %4u %6d  %6d   %-3s %6u   %-3s  %-10s "
2453                         "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
2454                    proto->name,
2455                    proto->obj_size,
2456                    sock_prot_inuse_get(seq_file_net(seq), proto),
2457                    proto->memory_allocated != NULL ? atomic_read(proto->memory_allocated) : -1,
2458                    proto->memory_pressure != NULL ? *proto->memory_pressure ? "yes" : "no" : "NI",
2459                    proto->max_header,
2460                    proto->slab == NULL ? "no" : "yes",
2461                    module_name(proto->owner),
2462                    proto_method_implemented(proto->close),
2463                    proto_method_implemented(proto->connect),
2464                    proto_method_implemented(proto->disconnect),
2465                    proto_method_implemented(proto->accept),
2466                    proto_method_implemented(proto->ioctl),
2467                    proto_method_implemented(proto->init),
2468                    proto_method_implemented(proto->destroy),
2469                    proto_method_implemented(proto->shutdown),
2470                    proto_method_implemented(proto->setsockopt),
2471                    proto_method_implemented(proto->getsockopt),
2472                    proto_method_implemented(proto->sendmsg),
2473                    proto_method_implemented(proto->recvmsg),
2474                    proto_method_implemented(proto->sendpage),
2475                    proto_method_implemented(proto->bind),
2476                    proto_method_implemented(proto->backlog_rcv),
2477                    proto_method_implemented(proto->hash),
2478                    proto_method_implemented(proto->unhash),
2479                    proto_method_implemented(proto->get_port),
2480                    proto_method_implemented(proto->enter_memory_pressure));
2481 }
2482
2483 static int proto_seq_show(struct seq_file *seq, void *v)
2484 {
2485         if (v == &proto_list)
2486                 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
2487                            "protocol",
2488                            "size",
2489                            "sockets",
2490                            "memory",
2491                            "press",
2492                            "maxhdr",
2493                            "slab",
2494                            "module",
2495                            "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
2496         else
2497                 proto_seq_printf(seq, list_entry(v, struct proto, node));
2498         return 0;
2499 }
2500
2501 static const struct seq_operations proto_seq_ops = {
2502         .start  = proto_seq_start,
2503         .next   = proto_seq_next,
2504         .stop   = proto_seq_stop,
2505         .show   = proto_seq_show,
2506 };
2507
2508 static int proto_seq_open(struct inode *inode, struct file *file)
2509 {
2510         return seq_open_net(inode, file, &proto_seq_ops,
2511                             sizeof(struct seq_net_private));
2512 }
2513
2514 static const struct file_operations proto_seq_fops = {
2515         .owner          = THIS_MODULE,
2516         .open           = proto_seq_open,
2517         .read           = seq_read,
2518         .llseek         = seq_lseek,
2519         .release        = seq_release_net,
2520 };
2521
2522 static __net_init int proto_init_net(struct net *net)
2523 {
2524         if (!proc_net_fops_create(net, "protocols", S_IRUGO, &proto_seq_fops))
2525                 return -ENOMEM;
2526
2527         return 0;
2528 }
2529
2530 static __net_exit void proto_exit_net(struct net *net)
2531 {
2532         proc_net_remove(net, "protocols");
2533 }
2534
2535
2536 static __net_initdata struct pernet_operations proto_net_ops = {
2537         .init = proto_init_net,
2538         .exit = proto_exit_net,
2539 };
2540
2541 static int __init proto_init(void)
2542 {
2543         return register_pernet_subsys(&proto_net_ops);
2544 }
2545
2546 subsys_initcall(proto_init);
2547
2548 #endif /* PROC_FS */