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net: sk_sleep() helper
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / net / core / sock.c
CommitLineData
1da177e4
LT		 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 *
02c30a84 10 * Authors: Ross Biro
1da177e4
LT		 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
4ec93edb 35 * code. The ACK stuff can wait and needs major
1da177e4
LT		 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
4fc268d2 92#include <linux/capability.h>
1da177e4
LT		 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>
1da177e4
LT		 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>
a1f8e7f7 112#include <linux/highmem.h>
1da177e4
LT		 113
114#include <asm/uaccess.h>
115#include <asm/system.h>
116
117#include <linux/netdevice.h>
118#include <net/protocol.h>
119#include <linux/skbuff.h>
457c4cbc 120#include <net/net_namespace.h>
2e6599cb 121#include <net/request_sock.h>
1da177e4 122#include <net/sock.h>
20d49473 123#include <linux/net_tstamp.h>
1da177e4
LT		 124#include <net/xfrm.h>
125#include <linux/ipsec.h>
126
127#include <linux/filter.h>
128
129#ifdef CONFIG_INET
130#include <net/tcp.h>
131#endif
132
da21f24d
IM		 133/*
134 * Each address family might have different locking rules, so we have
135 * one slock key per address family:
136 */
a5b5bb9a
IM		 137static struct lock_class_key af_family_keys[AF_MAX];
138static struct lock_class_key af_family_slock_keys[AF_MAX];
139
a5b5bb9a
IM		 140/*
141 * Make lock validator output more readable. (we pre-construct these
142 * strings build-time, so that runtime initialization of socket
143 * locks is fast):
144 */
36cbd3dc 145static const char *const af_family_key_strings[AF_MAX+1] = {
a5b5bb9a
IM		 146 "sk_lock-AF_UNSPEC", "sk_lock-AF_UNIX" , "sk_lock-AF_INET" ,
147 "sk_lock-AF_AX25" , "sk_lock-AF_IPX" , "sk_lock-AF_APPLETALK",
148 "sk_lock-AF_NETROM", "sk_lock-AF_BRIDGE" , "sk_lock-AF_ATMPVC" ,
149 "sk_lock-AF_X25" , "sk_lock-AF_INET6" , "sk_lock-AF_ROSE" ,
150 "sk_lock-AF_DECnet", "sk_lock-AF_NETBEUI" , "sk_lock-AF_SECURITY" ,
151 "sk_lock-AF_KEY" , "sk_lock-AF_NETLINK" , "sk_lock-AF_PACKET" ,
152 "sk_lock-AF_ASH" , "sk_lock-AF_ECONET" , "sk_lock-AF_ATMSVC" ,
cbd151bf 153 "sk_lock-AF_RDS" , "sk_lock-AF_SNA" , "sk_lock-AF_IRDA" ,
a5b5bb9a 154 "sk_lock-AF_PPPOX" , "sk_lock-AF_WANPIPE" , "sk_lock-AF_LLC" ,
cd05acfe 155 "sk_lock-27" , "sk_lock-28" , "sk_lock-AF_CAN" ,
17926a79 156 "sk_lock-AF_TIPC" , "sk_lock-AF_BLUETOOTH", "sk_lock-IUCV" ,
bce7b154 157 "sk_lock-AF_RXRPC" , "sk_lock-AF_ISDN" , "sk_lock-AF_PHONET" ,
fcb94e42 158 "sk_lock-AF_IEEE802154",
bce7b154 159 "sk_lock-AF_MAX"
a5b5bb9a 160};
36cbd3dc 161static const char *const af_family_slock_key_strings[AF_MAX+1] = {
a5b5bb9a
IM		 162 "slock-AF_UNSPEC", "slock-AF_UNIX" , "slock-AF_INET" ,
163 "slock-AF_AX25" , "slock-AF_IPX" , "slock-AF_APPLETALK",
164 "slock-AF_NETROM", "slock-AF_BRIDGE" , "slock-AF_ATMPVC" ,
165 "slock-AF_X25" , "slock-AF_INET6" , "slock-AF_ROSE" ,
166 "slock-AF_DECnet", "slock-AF_NETBEUI" , "slock-AF_SECURITY" ,
167 "slock-AF_KEY" , "slock-AF_NETLINK" , "slock-AF_PACKET" ,
168 "slock-AF_ASH" , "slock-AF_ECONET" , "slock-AF_ATMSVC" ,
cbd151bf 169 "slock-AF_RDS" , "slock-AF_SNA" , "slock-AF_IRDA" ,
a5b5bb9a 170 "slock-AF_PPPOX" , "slock-AF_WANPIPE" , "slock-AF_LLC" ,
cd05acfe 171 "slock-27" , "slock-28" , "slock-AF_CAN" ,
17926a79 172 "slock-AF_TIPC" , "slock-AF_BLUETOOTH", "slock-AF_IUCV" ,
bce7b154 173 "slock-AF_RXRPC" , "slock-AF_ISDN" , "slock-AF_PHONET" ,
fcb94e42 174 "slock-AF_IEEE802154",
bce7b154 175 "slock-AF_MAX"
a5b5bb9a 176};
36cbd3dc 177static const char *const af_family_clock_key_strings[AF_MAX+1] = {
443aef0e
PZ		 178 "clock-AF_UNSPEC", "clock-AF_UNIX" , "clock-AF_INET" ,
179 "clock-AF_AX25" , "clock-AF_IPX" , "clock-AF_APPLETALK",
180 "clock-AF_NETROM", "clock-AF_BRIDGE" , "clock-AF_ATMPVC" ,
181 "clock-AF_X25" , "clock-AF_INET6" , "clock-AF_ROSE" ,
182 "clock-AF_DECnet", "clock-AF_NETBEUI" , "clock-AF_SECURITY" ,
183 "clock-AF_KEY" , "clock-AF_NETLINK" , "clock-AF_PACKET" ,
184 "clock-AF_ASH" , "clock-AF_ECONET" , "clock-AF_ATMSVC" ,
cbd151bf 185 "clock-AF_RDS" , "clock-AF_SNA" , "clock-AF_IRDA" ,
443aef0e 186 "clock-AF_PPPOX" , "clock-AF_WANPIPE" , "clock-AF_LLC" ,
b4942af6 187 "clock-27" , "clock-28" , "clock-AF_CAN" ,
e51f802b 188 "clock-AF_TIPC" , "clock-AF_BLUETOOTH", "clock-AF_IUCV" ,
bce7b154 189 "clock-AF_RXRPC" , "clock-AF_ISDN" , "clock-AF_PHONET" ,
fcb94e42 190 "clock-AF_IEEE802154",
bce7b154 191 "clock-AF_MAX"
443aef0e 192};
da21f24d
IM		 193
194/*
195 * sk_callback_lock locking rules are per-address-family,
196 * so split the lock classes by using a per-AF key:
197 */
198static struct lock_class_key af_callback_keys[AF_MAX];
199
1da177e4
LT		 200/* Take into consideration the size of the struct sk_buff overhead in the
201 * determination of these values, since that is non-constant across
202 * platforms. This makes socket queueing behavior and performance
203 * not depend upon such differences.
204 */
205#define _SK_MEM_PACKETS 256
206#define _SK_MEM_OVERHEAD (sizeof(struct sk_buff) + 256)
207#define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
208#define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
209
210/* Run time adjustable parameters. */
ab32ea5d
BH		 211__u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX;
212__u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX;
213__u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX;
214__u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX;
1da177e4
LT		 215
216/* Maximal space eaten by iovec or ancilliary data plus some space */
ab32ea5d 217int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512);
2a91525c 218EXPORT_SYMBOL(sysctl_optmem_max);
1da177e4
LT		 219
220static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen)
221{
222 struct timeval tv;
223
224 if (optlen < sizeof(tv))
225 return -EINVAL;
226 if (copy_from_user(&tv, optval, sizeof(tv)))
227 return -EFAULT;
ba78073e
VA		 228 if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC)
229 return -EDOM;
1da177e4 230
ba78073e 231 if (tv.tv_sec < 0) {
6f11df83
AM		 232 static int warned __read_mostly;
233
ba78073e 234 *timeo_p = 0;
50aab54f 235 if (warned < 10 && net_ratelimit()) {
ba78073e
VA		 236 warned++;
237 printk(KERN_INFO "sock_set_timeout: `%s' (pid %d) "
238 "tries to set negative timeout\n",
ba25f9dc 239 current->comm, task_pid_nr(current));
50aab54f 240 }
ba78073e
VA		 241 return 0;
242 }
1da177e4
LT		 243 *timeo_p = MAX_SCHEDULE_TIMEOUT;
244 if (tv.tv_sec == 0 && tv.tv_usec == 0)
245 return 0;
246 if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1))
247 *timeo_p = tv.tv_sec*HZ + (tv.tv_usec+(1000000/HZ-1))/(1000000/HZ);
248 return 0;
249}
250
251static void sock_warn_obsolete_bsdism(const char *name)
252{
253 static int warned;
254 static char warncomm[TASK_COMM_LEN];
4ec93edb
YH		 255 if (strcmp(warncomm, current->comm) && warned < 5) {
256 strcpy(warncomm, current->comm);
1da177e4
LT		 257 printk(KERN_WARNING "process `%s' is using obsolete "
258 "%s SO_BSDCOMPAT\n", warncomm, name);
259 warned++;
260 }
261}
262
20d49473 263static void sock_disable_timestamp(struct sock *sk, int flag)
4ec93edb 264{
20d49473
PO		 265 if (sock_flag(sk, flag)) {
266 sock_reset_flag(sk, flag);
267 if (!sock_flag(sk, SOCK_TIMESTAMP) &&
268 !sock_flag(sk, SOCK_TIMESTAMPING_RX_SOFTWARE)) {
269 net_disable_timestamp();
270 }
1da177e4
LT		 271 }
272}
273
274
f0088a50
DV		 275int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
276{
766e9037 277 int err;
f0088a50 278 int skb_len;
3b885787
NH		 279 unsigned long flags;
280 struct sk_buff_head *list = &sk->sk_receive_queue;
f0088a50 281
9ee6b7f1 282 /* Cast sk->rcvbuf to unsigned... It's pointless, but reduces
f0088a50
DV		 283 number of warnings when compiling with -W --ANK
284 */
285 if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >=
286 (unsigned)sk->sk_rcvbuf) {
766e9037
ED		 287 atomic_inc(&sk->sk_drops);
288 return -ENOMEM;
f0088a50
DV		 289 }
290
fda9ef5d 291 err = sk_filter(sk, skb);
f0088a50 292 if (err)
766e9037 293 return err;
f0088a50 294
3ab224be 295 if (!sk_rmem_schedule(sk, skb->truesize)) {
766e9037
ED		 296 atomic_inc(&sk->sk_drops);
297 return -ENOBUFS;
3ab224be
HA		 298 }
299
f0088a50
DV		 300 skb->dev = NULL;
301 skb_set_owner_r(skb, sk);
49ad9599 302
f0088a50
DV		 303 /* Cache the SKB length before we tack it onto the receive
304 * queue. Once it is added it no longer belongs to us and
305 * may be freed by other threads of control pulling packets
306 * from the queue.
307 */
308 skb_len = skb->len;
309
3b885787
NH		 310 spin_lock_irqsave(&list->lock, flags);
311 skb->dropcount = atomic_read(&sk->sk_drops);
312 __skb_queue_tail(list, skb);
313 spin_unlock_irqrestore(&list->lock, flags);
f0088a50
DV		 314
315 if (!sock_flag(sk, SOCK_DEAD))
316 sk->sk_data_ready(sk, skb_len);
766e9037 317 return 0;
f0088a50
DV		 318}
319EXPORT_SYMBOL(sock_queue_rcv_skb);
320
58a5a7b9 321int sk_receive_skb(struct sock *sk, struct sk_buff *skb, const int nested)
f0088a50
DV		 322{
323 int rc = NET_RX_SUCCESS;
324
fda9ef5d 325 if (sk_filter(sk, skb))
f0088a50
DV		 326 goto discard_and_relse;
327
328 skb->dev = NULL;
329
58a5a7b9
ACM		 330 if (nested)
331 bh_lock_sock_nested(sk);
332 else
333 bh_lock_sock(sk);
a5b5bb9a
IM		 334 if (!sock_owned_by_user(sk)) {
335 /*
336 * trylock + unlock semantics:
337 */
338 mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_);
339
c57943a1 340 rc = sk_backlog_rcv(sk, skb);
a5b5bb9a
IM		 341
342 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
a3a858ff 343 } else if (sk_add_backlog(sk, skb)) {
8eae939f
ZY		 344 bh_unlock_sock(sk);
345 atomic_inc(&sk->sk_drops);
346 goto discard_and_relse;
347 }
348
f0088a50
DV		 349 bh_unlock_sock(sk);
350out:
351 sock_put(sk);
352 return rc;
353discard_and_relse:
354 kfree_skb(skb);
355 goto out;
356}
357EXPORT_SYMBOL(sk_receive_skb);
358
ea94ff3b
KK		 359void sk_reset_txq(struct sock *sk)
360{
361 sk_tx_queue_clear(sk);
362}
363EXPORT_SYMBOL(sk_reset_txq);
364
f0088a50
DV		 365struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie)
366{
b6c6712a 367 struct dst_entry *dst = __sk_dst_get(sk);
f0088a50
DV		 368
369 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
e022f0b4 370 sk_tx_queue_clear(sk);
b6c6712a 371 rcu_assign_pointer(sk->sk_dst_cache, NULL);
f0088a50
DV		 372 dst_release(dst);
373 return NULL;
374 }
375
376 return dst;
377}
378EXPORT_SYMBOL(__sk_dst_check);
379
380struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie)
381{
382 struct dst_entry *dst = sk_dst_get(sk);
383
384 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
385 sk_dst_reset(sk);
386 dst_release(dst);
387 return NULL;
388 }
389
390 return dst;
391}
392EXPORT_SYMBOL(sk_dst_check);
393
4878809f
DM		 394static int sock_bindtodevice(struct sock *sk, char __user *optval, int optlen)
395{
396 int ret = -ENOPROTOOPT;
397#ifdef CONFIG_NETDEVICES
3b1e0a65 398 struct net *net = sock_net(sk);
4878809f
DM		 399 char devname[IFNAMSIZ];
400 int index;
401
402 /* Sorry... */
403 ret = -EPERM;
404 if (!capable(CAP_NET_RAW))
405 goto out;
406
407 ret = -EINVAL;
408 if (optlen < 0)
409 goto out;
410
411 /* Bind this socket to a particular device like "eth0",
412 * as specified in the passed interface name. If the
413 * name is "" or the option length is zero the socket
414 * is not bound.
415 */
416 if (optlen > IFNAMSIZ - 1)
417 optlen = IFNAMSIZ - 1;
418 memset(devname, 0, sizeof(devname));
419
420 ret = -EFAULT;
421 if (copy_from_user(devname, optval, optlen))
422 goto out;
423
000ba2e4
DM		 424 index = 0;
425 if (devname[0] != '\0') {
bf8e56bf 426 struct net_device *dev;
4878809f 427
bf8e56bf
ED		 428 rcu_read_lock();
429 dev = dev_get_by_name_rcu(net, devname);
430 if (dev)
431 index = dev->ifindex;
432 rcu_read_unlock();
4878809f
DM		 433 ret = -ENODEV;
434 if (!dev)
435 goto out;
4878809f
DM		 436 }
437
438 lock_sock(sk);
439 sk->sk_bound_dev_if = index;
440 sk_dst_reset(sk);
441 release_sock(sk);
442
443 ret = 0;
444
445out:
446#endif
447
448 return ret;
449}
450
c0ef877b
PE		 451static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool)
452{
453 if (valbool)
454 sock_set_flag(sk, bit);
455 else
456 sock_reset_flag(sk, bit);
457}
458
1da177e4
LT		 459/*
460 * This is meant for all protocols to use and covers goings on
461 * at the socket level. Everything here is generic.
462 */
463
464int sock_setsockopt(struct socket *sock, int level, int optname,
b7058842 465 char __user *optval, unsigned int optlen)
1da177e4 466{
2a91525c 467 struct sock *sk = sock->sk;
1da177e4
LT		 468 int val;
469 int valbool;
470 struct linger ling;
471 int ret = 0;
4ec93edb 472
1da177e4
LT		 473 /*
474 * Options without arguments
475 */
476
4878809f
DM		 477 if (optname == SO_BINDTODEVICE)
478 return sock_bindtodevice(sk, optval, optlen);
479
e71a4783
SH		 480 if (optlen < sizeof(int))
481 return -EINVAL;
4ec93edb 482
1da177e4
LT		 483 if (get_user(val, (int __user *)optval))
484 return -EFAULT;
4ec93edb 485
2a91525c 486 valbool = val ? 1 : 0;
1da177e4
LT		 487
488 lock_sock(sk);
489
2a91525c 490 switch (optname) {
e71a4783 491 case SO_DEBUG:
2a91525c 492 if (val && !capable(CAP_NET_ADMIN))
e71a4783 493 ret = -EACCES;
2a91525c 494 else
c0ef877b 495 sock_valbool_flag(sk, SOCK_DBG, valbool);
e71a4783
SH		 496 break;
497 case SO_REUSEADDR:
498 sk->sk_reuse = valbool;
499 break;
500 case SO_TYPE:
49c794e9 501 case SO_PROTOCOL:
0d6038ee 502 case SO_DOMAIN:
e71a4783
SH		 503 case SO_ERROR:
504 ret = -ENOPROTOOPT;
505 break;
506 case SO_DONTROUTE:
c0ef877b 507 sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool);
e71a4783
SH		 508 break;
509 case SO_BROADCAST:
510 sock_valbool_flag(sk, SOCK_BROADCAST, valbool);
511 break;
512 case SO_SNDBUF:
513 /* Don't error on this BSD doesn't and if you think
514 about it this is right. Otherwise apps have to
515 play 'guess the biggest size' games. RCVBUF/SNDBUF
516 are treated in BSD as hints */
517
518 if (val > sysctl_wmem_max)
519 val = sysctl_wmem_max;
b0573dea 520set_sndbuf:
e71a4783
SH		 521 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
522 if ((val * 2) < SOCK_MIN_SNDBUF)
523 sk->sk_sndbuf = SOCK_MIN_SNDBUF;
524 else
525 sk->sk_sndbuf = val * 2;
1da177e4 526
e71a4783
SH		 527 /*
528 * Wake up sending tasks if we
529 * upped the value.
530 */
531 sk->sk_write_space(sk);
532 break;
1da177e4 533
e71a4783
SH		 534 case SO_SNDBUFFORCE:
535 if (!capable(CAP_NET_ADMIN)) {
536 ret = -EPERM;
537 break;
538 }
539 goto set_sndbuf;
b0573dea 540
e71a4783
SH		 541 case SO_RCVBUF:
542 /* Don't error on this BSD doesn't and if you think
543 about it this is right. Otherwise apps have to
544 play 'guess the biggest size' games. RCVBUF/SNDBUF
545 are treated in BSD as hints */
4ec93edb 546
e71a4783
SH		 547 if (val > sysctl_rmem_max)
548 val = sysctl_rmem_max;
b0573dea 549set_rcvbuf:
e71a4783
SH		 550 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
551 /*
552 * We double it on the way in to account for
553 * "struct sk_buff" etc. overhead. Applications
554 * assume that the SO_RCVBUF setting they make will
555 * allow that much actual data to be received on that
556 * socket.
557 *
558 * Applications are unaware that "struct sk_buff" and
559 * other overheads allocate from the receive buffer
560 * during socket buffer allocation.
561 *
562 * And after considering the possible alternatives,
563 * returning the value we actually used in getsockopt
564 * is the most desirable behavior.
565 */
566 if ((val * 2) < SOCK_MIN_RCVBUF)
567 sk->sk_rcvbuf = SOCK_MIN_RCVBUF;
568 else
569 sk->sk_rcvbuf = val * 2;
570 break;
571
572 case SO_RCVBUFFORCE:
573 if (!capable(CAP_NET_ADMIN)) {
574 ret = -EPERM;
1da177e4 575 break;
e71a4783
SH		 576 }
577 goto set_rcvbuf;
1da177e4 578
e71a4783 579 case SO_KEEPALIVE:
1da177e4 580#ifdef CONFIG_INET
e71a4783
SH		 581 if (sk->sk_protocol == IPPROTO_TCP)
582 tcp_set_keepalive(sk, valbool);
1da177e4 583#endif
e71a4783
SH		 584 sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool);
585 break;
586
587 case SO_OOBINLINE:
588 sock_valbool_flag(sk, SOCK_URGINLINE, valbool);
589 break;
590
591 case SO_NO_CHECK:
592 sk->sk_no_check = valbool;
593 break;
594
595 case SO_PRIORITY:
596 if ((val >= 0 && val <= 6) || capable(CAP_NET_ADMIN))
597 sk->sk_priority = val;
598 else
599 ret = -EPERM;
600 break;
601
602 case SO_LINGER:
603 if (optlen < sizeof(ling)) {
604 ret = -EINVAL; /* 1003.1g */
1da177e4 605 break;
e71a4783 606 }
2a91525c 607 if (copy_from_user(&ling, optval, sizeof(ling))) {
e71a4783 608 ret = -EFAULT;
1da177e4 609 break;
e71a4783
SH		 610 }
611 if (!ling.l_onoff)
612 sock_reset_flag(sk, SOCK_LINGER);
613 else {
1da177e4 614#if (BITS_PER_LONG == 32)
e71a4783
SH		 615 if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ)
616 sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT;
1da177e4 617 else
e71a4783
SH		 618#endif
619 sk->sk_lingertime = (unsigned int)ling.l_linger * HZ;
620 sock_set_flag(sk, SOCK_LINGER);
621 }
622 break;
623
624 case SO_BSDCOMPAT:
625 sock_warn_obsolete_bsdism("setsockopt");
626 break;
627
628 case SO_PASSCRED:
629 if (valbool)
630 set_bit(SOCK_PASSCRED, &sock->flags);
631 else
632 clear_bit(SOCK_PASSCRED, &sock->flags);
633 break;
634
635 case SO_TIMESTAMP:
92f37fd2 636 case SO_TIMESTAMPNS:
e71a4783 637 if (valbool) {
92f37fd2
ED		 638 if (optname == SO_TIMESTAMP)
639 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
640 else
641 sock_set_flag(sk, SOCK_RCVTSTAMPNS);
e71a4783 642 sock_set_flag(sk, SOCK_RCVTSTAMP);
20d49473 643 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
92f37fd2 644 } else {
e71a4783 645 sock_reset_flag(sk, SOCK_RCVTSTAMP);
92f37fd2
ED		 646 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
647 }
e71a4783
SH		 648 break;
649
20d49473
PO		 650 case SO_TIMESTAMPING:
651 if (val & ~SOF_TIMESTAMPING_MASK) {
f249fb78 652 ret = -EINVAL;
20d49473
PO		 653 break;
654 }
655 sock_valbool_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE,
656 val & SOF_TIMESTAMPING_TX_HARDWARE);
657 sock_valbool_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE,
658 val & SOF_TIMESTAMPING_TX_SOFTWARE);
659 sock_valbool_flag(sk, SOCK_TIMESTAMPING_RX_HARDWARE,
660 val & SOF_TIMESTAMPING_RX_HARDWARE);
661 if (val & SOF_TIMESTAMPING_RX_SOFTWARE)
662 sock_enable_timestamp(sk,
663 SOCK_TIMESTAMPING_RX_SOFTWARE);
664 else
665 sock_disable_timestamp(sk,
666 SOCK_TIMESTAMPING_RX_SOFTWARE);
667 sock_valbool_flag(sk, SOCK_TIMESTAMPING_SOFTWARE,
668 val & SOF_TIMESTAMPING_SOFTWARE);
669 sock_valbool_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE,
670 val & SOF_TIMESTAMPING_SYS_HARDWARE);
671 sock_valbool_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE,
672 val & SOF_TIMESTAMPING_RAW_HARDWARE);
673 break;
674
e71a4783
SH		 675 case SO_RCVLOWAT:
676 if (val < 0)
677 val = INT_MAX;
678 sk->sk_rcvlowat = val ? : 1;
679 break;
680
681 case SO_RCVTIMEO:
682 ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen);
683 break;
684
685 case SO_SNDTIMEO:
686 ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen);
687 break;
1da177e4 688
e71a4783
SH		 689 case SO_ATTACH_FILTER:
690 ret = -EINVAL;
691 if (optlen == sizeof(struct sock_fprog)) {
692 struct sock_fprog fprog;
1da177e4 693
e71a4783
SH		 694 ret = -EFAULT;
695 if (copy_from_user(&fprog, optval, sizeof(fprog)))
1da177e4 696 break;
e71a4783
SH		 697
698 ret = sk_attach_filter(&fprog, sk);
699 }
700 break;
701
702 case SO_DETACH_FILTER:
55b33325 703 ret = sk_detach_filter(sk);
e71a4783 704 break;
1da177e4 705
e71a4783
SH		 706 case SO_PASSSEC:
707 if (valbool)
708 set_bit(SOCK_PASSSEC, &sock->flags);
709 else
710 clear_bit(SOCK_PASSSEC, &sock->flags);
711 break;
4a19ec58
LAT		 712 case SO_MARK:
713 if (!capable(CAP_NET_ADMIN))
714 ret = -EPERM;
2a91525c 715 else
4a19ec58 716 sk->sk_mark = val;
4a19ec58 717 break;
877ce7c1 718
1da177e4
LT		 719 /* We implement the SO_SNDLOWAT etc to
720 not be settable (1003.1g 5.3) */
3b885787
NH		 721 case SO_RXQ_OVFL:
722 if (valbool)
723 sock_set_flag(sk, SOCK_RXQ_OVFL);
724 else
725 sock_reset_flag(sk, SOCK_RXQ_OVFL);
726 break;
e71a4783
SH		 727 default:
728 ret = -ENOPROTOOPT;
729 break;
4ec93edb 730 }
1da177e4
LT		 731 release_sock(sk);
732 return ret;
733}
2a91525c 734EXPORT_SYMBOL(sock_setsockopt);
1da177e4
LT		 735
736
737int sock_getsockopt(struct socket *sock, int level, int optname,
738 char __user *optval, int __user *optlen)
739{
740 struct sock *sk = sock->sk;
4ec93edb 741
e71a4783 742 union {
4ec93edb
YH		 743 int val;
744 struct linger ling;
1da177e4
LT		 745 struct timeval tm;
746 } v;
4ec93edb 747
4d0392be 748 int lv = sizeof(int);
1da177e4 749 int len;
4ec93edb 750
e71a4783 751 if (get_user(len, optlen))
4ec93edb 752 return -EFAULT;
e71a4783 753 if (len < 0)
1da177e4 754 return -EINVAL;
4ec93edb 755
50fee1de 756 memset(&v, 0, sizeof(v));
df0bca04 757
2a91525c 758 switch (optname) {
e71a4783
SH		 759 case SO_DEBUG:
760 v.val = sock_flag(sk, SOCK_DBG);
761 break;
762
763 case SO_DONTROUTE:
764 v.val = sock_flag(sk, SOCK_LOCALROUTE);
765 break;
766
767 case SO_BROADCAST:
768 v.val = !!sock_flag(sk, SOCK_BROADCAST);
769 break;
770
771 case SO_SNDBUF:
772 v.val = sk->sk_sndbuf;
773 break;
774
775 case SO_RCVBUF:
776 v.val = sk->sk_rcvbuf;
777 break;
778
779 case SO_REUSEADDR:
780 v.val = sk->sk_reuse;
781 break;
782
783 case SO_KEEPALIVE:
784 v.val = !!sock_flag(sk, SOCK_KEEPOPEN);
785 break;
786
787 case SO_TYPE:
788 v.val = sk->sk_type;
789 break;
790
49c794e9
JE		 791 case SO_PROTOCOL:
792 v.val = sk->sk_protocol;
793 break;
794
0d6038ee
JE		 795 case SO_DOMAIN:
796 v.val = sk->sk_family;
797 break;
798
e71a4783
SH		 799 case SO_ERROR:
800 v.val = -sock_error(sk);
2a91525c 801 if (v.val == 0)
e71a4783
SH		 802 v.val = xchg(&sk->sk_err_soft, 0);
803 break;
804
805 case SO_OOBINLINE:
806 v.val = !!sock_flag(sk, SOCK_URGINLINE);
807 break;
808
809 case SO_NO_CHECK:
810 v.val = sk->sk_no_check;
811 break;
812
813 case SO_PRIORITY:
814 v.val = sk->sk_priority;
815 break;
816
817 case SO_LINGER:
818 lv = sizeof(v.ling);
819 v.ling.l_onoff = !!sock_flag(sk, SOCK_LINGER);
820 v.ling.l_linger = sk->sk_lingertime / HZ;
821 break;
822
823 case SO_BSDCOMPAT:
824 sock_warn_obsolete_bsdism("getsockopt");
825 break;
826
827 case SO_TIMESTAMP:
92f37fd2
ED		 828 v.val = sock_flag(sk, SOCK_RCVTSTAMP) &&
829 !sock_flag(sk, SOCK_RCVTSTAMPNS);
830 break;
831
832 case SO_TIMESTAMPNS:
833 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS);
e71a4783
SH		 834 break;
835
20d49473
PO		 836 case SO_TIMESTAMPING:
837 v.val = 0;
838 if (sock_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE))
839 v.val |= SOF_TIMESTAMPING_TX_HARDWARE;
840 if (sock_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE))
841 v.val |= SOF_TIMESTAMPING_TX_SOFTWARE;
842 if (sock_flag(sk, SOCK_TIMESTAMPING_RX_HARDWARE))
843 v.val |= SOF_TIMESTAMPING_RX_HARDWARE;
844 if (sock_flag(sk, SOCK_TIMESTAMPING_RX_SOFTWARE))
845 v.val |= SOF_TIMESTAMPING_RX_SOFTWARE;
846 if (sock_flag(sk, SOCK_TIMESTAMPING_SOFTWARE))
847 v.val |= SOF_TIMESTAMPING_SOFTWARE;
848 if (sock_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE))
849 v.val |= SOF_TIMESTAMPING_SYS_HARDWARE;
850 if (sock_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE))
851 v.val |= SOF_TIMESTAMPING_RAW_HARDWARE;
852 break;
853
e71a4783 854 case SO_RCVTIMEO:
2a91525c 855 lv = sizeof(struct timeval);
e71a4783
SH		 856 if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) {
857 v.tm.tv_sec = 0;
858 v.tm.tv_usec = 0;
859 } else {
860 v.tm.tv_sec = sk->sk_rcvtimeo / HZ;
861 v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ;
862 }
863 break;
864
865 case SO_SNDTIMEO:
2a91525c 866 lv = sizeof(struct timeval);
e71a4783
SH		 867 if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) {
868 v.tm.tv_sec = 0;
869 v.tm.tv_usec = 0;
870 } else {
871 v.tm.tv_sec = sk->sk_sndtimeo / HZ;
872 v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ;
873 }
874 break;
1da177e4 875
e71a4783
SH		 876 case SO_RCVLOWAT:
877 v.val = sk->sk_rcvlowat;
878 break;
1da177e4 879
e71a4783 880 case SO_SNDLOWAT:
2a91525c 881 v.val = 1;
e71a4783 882 break;
1da177e4 883
e71a4783
SH		 884 case SO_PASSCRED:
885 v.val = test_bit(SOCK_PASSCRED, &sock->flags) ? 1 : 0;
886 break;
1da177e4 887
e71a4783
SH		 888 case SO_PEERCRED:
889 if (len > sizeof(sk->sk_peercred))
890 len = sizeof(sk->sk_peercred);
891 if (copy_to_user(optval, &sk->sk_peercred, len))
892 return -EFAULT;
893 goto lenout;
1da177e4 894
e71a4783
SH		 895 case SO_PEERNAME:
896 {
897 char address[128];
898
899 if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2))
900 return -ENOTCONN;
901 if (lv < len)
902 return -EINVAL;
903 if (copy_to_user(optval, address, len))
904 return -EFAULT;
905 goto lenout;
906 }
1da177e4 907
e71a4783
SH		 908 /* Dubious BSD thing... Probably nobody even uses it, but
909 * the UNIX standard wants it for whatever reason... -DaveM
910 */
911 case SO_ACCEPTCONN:
912 v.val = sk->sk_state == TCP_LISTEN;
913 break;
1da177e4 914
e71a4783
SH		 915 case SO_PASSSEC:
916 v.val = test_bit(SOCK_PASSSEC, &sock->flags) ? 1 : 0;
917 break;
877ce7c1 918
e71a4783
SH		 919 case SO_PEERSEC:
920 return security_socket_getpeersec_stream(sock, optval, optlen, len);
1da177e4 921
4a19ec58
LAT		 922 case SO_MARK:
923 v.val = sk->sk_mark;
924 break;
925
3b885787
NH		 926 case SO_RXQ_OVFL:
927 v.val = !!sock_flag(sk, SOCK_RXQ_OVFL);
928 break;
929
e71a4783
SH		 930 default:
931 return -ENOPROTOOPT;
1da177e4 932 }
e71a4783 933
1da177e4
LT		 934 if (len > lv)
935 len = lv;
936 if (copy_to_user(optval, &v, len))
937 return -EFAULT;
938lenout:
4ec93edb
YH		 939 if (put_user(len, optlen))
940 return -EFAULT;
941 return 0;
1da177e4
LT		 942}
943
a5b5bb9a
IM		 944/*
945 * Initialize an sk_lock.
946 *
947 * (We also register the sk_lock with the lock validator.)
948 */
b6f99a21 949static inline void sock_lock_init(struct sock *sk)
a5b5bb9a 950{
ed07536e
PZ		 951 sock_lock_init_class_and_name(sk,
952 af_family_slock_key_strings[sk->sk_family],
953 af_family_slock_keys + sk->sk_family,
954 af_family_key_strings[sk->sk_family],
955 af_family_keys + sk->sk_family);
a5b5bb9a
IM		 956}
957
4dc6dc71
ED		 958/*
959 * Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet,
960 * even temporarly, because of RCU lookups. sk_node should also be left as is.
961 */
f1a6c4da
PE		 962static void sock_copy(struct sock *nsk, const struct sock *osk)
963{
964#ifdef CONFIG_SECURITY_NETWORK
965 void *sptr = nsk->sk_security;
966#endif
4dc6dc71 967 BUILD_BUG_ON(offsetof(struct sock, sk_copy_start) !=
e022f0b4
KK		 968 sizeof(osk->sk_node) + sizeof(osk->sk_refcnt) +
969 sizeof(osk->sk_tx_queue_mapping));
4dc6dc71
ED		 970 memcpy(&nsk->sk_copy_start, &osk->sk_copy_start,
971 osk->sk_prot->obj_size - offsetof(struct sock, sk_copy_start));
f1a6c4da
PE		 972#ifdef CONFIG_SECURITY_NETWORK
973 nsk->sk_security = sptr;
974 security_sk_clone(osk, nsk);
975#endif
976}
977
2e4afe7b
PE		 978static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority,
979 int family)
c308c1b2
PE		 980{
981 struct sock *sk;
982 struct kmem_cache *slab;
983
984 slab = prot->slab;
e912b114
ED		 985 if (slab != NULL) {
986 sk = kmem_cache_alloc(slab, priority & ~__GFP_ZERO);
987 if (!sk)
988 return sk;
989 if (priority & __GFP_ZERO) {
990 /*
991 * caches using SLAB_DESTROY_BY_RCU should let
992 * sk_node.next un-modified. Special care is taken
993 * when initializing object to zero.
994 */
995 if (offsetof(struct sock, sk_node.next) != 0)
996 memset(sk, 0, offsetof(struct sock, sk_node.next));
997 memset(&sk->sk_node.pprev, 0,
998 prot->obj_size - offsetof(struct sock,
999 sk_node.pprev));
1000 }
1001 }
c308c1b2
PE		 1002 else
1003 sk = kmalloc(prot->obj_size, priority);
1004
2e4afe7b 1005 if (sk != NULL) {
a98b65a3
VN		 1006 kmemcheck_annotate_bitfield(sk, flags);
1007
2e4afe7b
PE		 1008 if (security_sk_alloc(sk, family, priority))
1009 goto out_free;
1010
1011 if (!try_module_get(prot->owner))
1012 goto out_free_sec;
e022f0b4 1013 sk_tx_queue_clear(sk);
2e4afe7b
PE		 1014 }
1015
c308c1b2 1016 return sk;
2e4afe7b
PE		 1017
1018out_free_sec:
1019 security_sk_free(sk);
1020out_free:
1021 if (slab != NULL)
1022 kmem_cache_free(slab, sk);
1023 else
1024 kfree(sk);
1025 return NULL;
c308c1b2
PE		 1026}
1027
1028static void sk_prot_free(struct proto *prot, struct sock *sk)
1029{
1030 struct kmem_cache *slab;
2e4afe7b 1031 struct module *owner;
c308c1b2 1032
2e4afe7b 1033 owner = prot->owner;
c308c1b2 1034 slab = prot->slab;
2e4afe7b
PE		 1035
1036 security_sk_free(sk);
c308c1b2
PE		 1037 if (slab != NULL)
1038 kmem_cache_free(slab, sk);
1039 else
1040 kfree(sk);
2e4afe7b 1041 module_put(owner);
c308c1b2
PE		 1042}
1043
1da177e4
LT		 1044/**
1045 * sk_alloc - All socket objects are allocated here
c4ea43c5 1046 * @net: the applicable net namespace
4dc3b16b
PP		 1047 * @family: protocol family
1048 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1049 * @prot: struct proto associated with this new sock instance
1da177e4 1050 */
1b8d7ae4 1051struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
6257ff21 1052 struct proto *prot)
1da177e4 1053{
c308c1b2 1054 struct sock *sk;
1da177e4 1055
154adbc8 1056 sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family);
1da177e4 1057 if (sk) {
154adbc8
PE		 1058 sk->sk_family = family;
1059 /*
1060 * See comment in struct sock definition to understand
1061 * why we need sk_prot_creator -acme
1062 */
1063 sk->sk_prot = sk->sk_prot_creator = prot;
1064 sock_lock_init(sk);
3b1e0a65 1065 sock_net_set(sk, get_net(net));
d66ee058 1066 atomic_set(&sk->sk_wmem_alloc, 1);
1da177e4 1067 }
a79af59e 1068
2e4afe7b 1069 return sk;
1da177e4 1070}
2a91525c 1071EXPORT_SYMBOL(sk_alloc);
1da177e4 1072
2b85a34e 1073static void __sk_free(struct sock *sk)
1da177e4
LT		 1074{
1075 struct sk_filter *filter;
1da177e4
LT		 1076
1077 if (sk->sk_destruct)
1078 sk->sk_destruct(sk);
1079
a898def2
PM		 1080 filter = rcu_dereference_check(sk->sk_filter,
1081 atomic_read(&sk->sk_wmem_alloc) == 0);
1da177e4 1082 if (filter) {
309dd5fc 1083 sk_filter_uncharge(sk, filter);
fda9ef5d 1084 rcu_assign_pointer(sk->sk_filter, NULL);
1da177e4
LT		 1085 }
1086
20d49473
PO		 1087 sock_disable_timestamp(sk, SOCK_TIMESTAMP);
1088 sock_disable_timestamp(sk, SOCK_TIMESTAMPING_RX_SOFTWARE);
1da177e4
LT		 1089
1090 if (atomic_read(&sk->sk_omem_alloc))
1091 printk(KERN_DEBUG "%s: optmem leakage (%d bytes) detected.\n",
0dc47877 1092 __func__, atomic_read(&sk->sk_omem_alloc));
1da177e4 1093
3b1e0a65 1094 put_net(sock_net(sk));
c308c1b2 1095 sk_prot_free(sk->sk_prot_creator, sk);
1da177e4 1096}
2b85a34e
ED		 1097
1098void sk_free(struct sock *sk)
1099{
1100 /*
1101 * We substract one from sk_wmem_alloc and can know if
1102 * some packets are still in some tx queue.
1103 * If not null, sock_wfree() will call __sk_free(sk) later
1104 */
1105 if (atomic_dec_and_test(&sk->sk_wmem_alloc))
1106 __sk_free(sk);
1107}
2a91525c 1108EXPORT_SYMBOL(sk_free);
1da177e4 1109
edf02087
DL		 1110/*
1111 * Last sock_put should drop referrence to sk->sk_net. It has already
1112 * been dropped in sk_change_net. Taking referrence to stopping namespace
1113 * is not an option.
1114 * Take referrence to a socket to remove it from hash _alive_ and after that
1115 * destroy it in the context of init_net.
1116 */
1117void sk_release_kernel(struct sock *sk)
1118{
1119 if (sk == NULL || sk->sk_socket == NULL)
1120 return;
1121
1122 sock_hold(sk);
1123 sock_release(sk->sk_socket);
65a18ec5 1124 release_net(sock_net(sk));
3b1e0a65 1125 sock_net_set(sk, get_net(&init_net));
edf02087
DL		 1126 sock_put(sk);
1127}
45af1754 1128EXPORT_SYMBOL(sk_release_kernel);
edf02087 1129
dd0fc66f 1130struct sock *sk_clone(const struct sock *sk, const gfp_t priority)
87d11ceb 1131{
8fd1d178 1132 struct sock *newsk;
87d11ceb 1133
8fd1d178 1134 newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family);
87d11ceb
ACM		 1135 if (newsk != NULL) {
1136 struct sk_filter *filter;
1137
892c141e 1138 sock_copy(newsk, sk);
87d11ceb
ACM		 1139
1140 /* SANITY */
3b1e0a65 1141 get_net(sock_net(newsk));
87d11ceb
ACM		 1142 sk_node_init(&newsk->sk_node);
1143 sock_lock_init(newsk);
1144 bh_lock_sock(newsk);
fa438ccf 1145 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL;
8eae939f 1146 newsk->sk_backlog.len = 0;
87d11ceb
ACM		 1147
1148 atomic_set(&newsk->sk_rmem_alloc, 0);
2b85a34e
ED		 1149 /*
1150 * sk_wmem_alloc set to one (see sk_free() and sock_wfree())
1151 */
1152 atomic_set(&newsk->sk_wmem_alloc, 1);
87d11ceb
ACM		 1153 atomic_set(&newsk->sk_omem_alloc, 0);
1154 skb_queue_head_init(&newsk->sk_receive_queue);
1155 skb_queue_head_init(&newsk->sk_write_queue);
97fc2f08
CL		 1156#ifdef CONFIG_NET_DMA
1157 skb_queue_head_init(&newsk->sk_async_wait_queue);
1158#endif
87d11ceb 1159
b6c6712a 1160 spin_lock_init(&newsk->sk_dst_lock);
87d11ceb 1161 rwlock_init(&newsk->sk_callback_lock);
443aef0e
PZ		 1162 lockdep_set_class_and_name(&newsk->sk_callback_lock,
1163 af_callback_keys + newsk->sk_family,
1164 af_family_clock_key_strings[newsk->sk_family]);
87d11ceb
ACM		 1165
1166 newsk->sk_dst_cache = NULL;
1167 newsk->sk_wmem_queued = 0;
1168 newsk->sk_forward_alloc = 0;
1169 newsk->sk_send_head = NULL;
87d11ceb
ACM		 1170 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
1171
1172 sock_reset_flag(newsk, SOCK_DONE);
1173 skb_queue_head_init(&newsk->sk_error_queue);
1174
1175 filter = newsk->sk_filter;
1176 if (filter != NULL)
1177 sk_filter_charge(newsk, filter);
1178
1179 if (unlikely(xfrm_sk_clone_policy(newsk))) {
1180 /* It is still raw copy of parent, so invalidate
1181 * destructor and make plain sk_free() */
1182 newsk->sk_destruct = NULL;
1183 sk_free(newsk);
1184 newsk = NULL;
1185 goto out;
1186 }
1187
1188 newsk->sk_err = 0;
1189 newsk->sk_priority = 0;
4dc6dc71
ED		 1190 /*
1191 * Before updating sk_refcnt, we must commit prior changes to memory
1192 * (Documentation/RCU/rculist_nulls.txt for details)
1193 */
1194 smp_wmb();
87d11ceb
ACM		 1195 atomic_set(&newsk->sk_refcnt, 2);
1196
1197 /*
1198 * Increment the counter in the same struct proto as the master
1199 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
1200 * is the same as sk->sk_prot->socks, as this field was copied
1201 * with memcpy).
1202 *
1203 * This _changes_ the previous behaviour, where
1204 * tcp_create_openreq_child always was incrementing the
1205 * equivalent to tcp_prot->socks (inet_sock_nr), so this have
1206 * to be taken into account in all callers. -acme
1207 */
1208 sk_refcnt_debug_inc(newsk);
972692e0 1209 sk_set_socket(newsk, NULL);
87d11ceb
ACM		 1210 newsk->sk_sleep = NULL;
1211
1212 if (newsk->sk_prot->sockets_allocated)
1748376b 1213 percpu_counter_inc(newsk->sk_prot->sockets_allocated);
704da560
OP		 1214
1215 if (sock_flag(newsk, SOCK_TIMESTAMP) ||
1216 sock_flag(newsk, SOCK_TIMESTAMPING_RX_SOFTWARE))
1217 net_enable_timestamp();
87d11ceb
ACM		 1218 }
1219out:
1220 return newsk;
1221}
87d11ceb
ACM		 1222EXPORT_SYMBOL_GPL(sk_clone);
1223
9958089a
AK		 1224void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
1225{
1226 __sk_dst_set(sk, dst);
1227 sk->sk_route_caps = dst->dev->features;
1228 if (sk->sk_route_caps & NETIF_F_GSO)
4fcd6b99 1229 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE;
9958089a 1230 if (sk_can_gso(sk)) {
82cc1a7a 1231 if (dst->header_len) {
9958089a 1232 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
82cc1a7a 1233 } else {
9958089a 1234 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
82cc1a7a
PWJ		 1235 sk->sk_gso_max_size = dst->dev->gso_max_size;
1236 }
9958089a
AK		 1237 }
1238}
1239EXPORT_SYMBOL_GPL(sk_setup_caps);
1240
1da177e4
LT		 1241void __init sk_init(void)
1242{
4481374c 1243 if (totalram_pages <= 4096) {
1da177e4
LT		 1244 sysctl_wmem_max = 32767;
1245 sysctl_rmem_max = 32767;
1246 sysctl_wmem_default = 32767;
1247 sysctl_rmem_default = 32767;
4481374c 1248 } else if (totalram_pages >= 131072) {
1da177e4
LT		 1249 sysctl_wmem_max = 131071;
1250 sysctl_rmem_max = 131071;
1251 }
1252}
1253
1254/*
1255 * Simple resource managers for sockets.
1256 */
1257
1258
4ec93edb
YH		 1259/*
1260 * Write buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1261 */
1262void sock_wfree(struct sk_buff *skb)
1263{
1264 struct sock *sk = skb->sk;
d99927f4 1265 unsigned int len = skb->truesize;
1da177e4 1266
d99927f4
ED		 1267 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) {
1268 /*
1269 * Keep a reference on sk_wmem_alloc, this will be released
1270 * after sk_write_space() call
1271 */
1272 atomic_sub(len - 1, &sk->sk_wmem_alloc);
1da177e4 1273 sk->sk_write_space(sk);
d99927f4
ED		 1274 len = 1;
1275 }
2b85a34e 1276 /*
d99927f4
ED		 1277 * if sk_wmem_alloc reaches 0, we must finish what sk_free()
1278 * could not do because of in-flight packets
2b85a34e 1279 */
d99927f4 1280 if (atomic_sub_and_test(len, &sk->sk_wmem_alloc))
2b85a34e 1281 __sk_free(sk);
1da177e4 1282}
2a91525c 1283EXPORT_SYMBOL(sock_wfree);
1da177e4 1284
4ec93edb
YH		 1285/*
1286 * Read buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1287 */
1288void sock_rfree(struct sk_buff *skb)
1289{
1290 struct sock *sk = skb->sk;
1291
1292 atomic_sub(skb->truesize, &sk->sk_rmem_alloc);
3ab224be 1293 sk_mem_uncharge(skb->sk, skb->truesize);
1da177e4 1294}
2a91525c 1295EXPORT_SYMBOL(sock_rfree);
1da177e4
LT		 1296
1297
1298int sock_i_uid(struct sock *sk)
1299{
1300 int uid;
1301
1302 read_lock(&sk->sk_callback_lock);
1303 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : 0;
1304 read_unlock(&sk->sk_callback_lock);
1305 return uid;
1306}
2a91525c 1307EXPORT_SYMBOL(sock_i_uid);
1da177e4
LT		 1308
1309unsigned long sock_i_ino(struct sock *sk)
1310{
1311 unsigned long ino;
1312
1313 read_lock(&sk->sk_callback_lock);
1314 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
1315 read_unlock(&sk->sk_callback_lock);
1316 return ino;
1317}
2a91525c 1318EXPORT_SYMBOL(sock_i_ino);
1da177e4
LT		 1319
1320/*
1321 * Allocate a skb from the socket's send buffer.
1322 */
86a76caf 1323struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
dd0fc66f 1324 gfp_t priority)
1da177e4
LT		 1325{
1326 if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
2a91525c 1327 struct sk_buff *skb = alloc_skb(size, priority);
1da177e4
LT		 1328 if (skb) {
1329 skb_set_owner_w(skb, sk);
1330 return skb;
1331 }
1332 }
1333 return NULL;
1334}
2a91525c 1335EXPORT_SYMBOL(sock_wmalloc);
1da177e4
LT		 1336
1337/*
1338 * Allocate a skb from the socket's receive buffer.
4ec93edb 1339 */
86a76caf 1340struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force,
dd0fc66f 1341 gfp_t priority)
1da177e4
LT		 1342{
1343 if (force || atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) {
1344 struct sk_buff *skb = alloc_skb(size, priority);
1345 if (skb) {
1346 skb_set_owner_r(skb, sk);
1347 return skb;
1348 }
1349 }
1350 return NULL;
1351}
1352
4ec93edb 1353/*
1da177e4 1354 * Allocate a memory block from the socket's option memory buffer.
4ec93edb 1355 */
dd0fc66f 1356void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
1da177e4
LT		 1357{
1358 if ((unsigned)size <= sysctl_optmem_max &&
1359 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) {
1360 void *mem;
1361 /* First do the add, to avoid the race if kmalloc
4ec93edb 1362 * might sleep.
1da177e4
LT		 1363 */
1364 atomic_add(size, &sk->sk_omem_alloc);
1365 mem = kmalloc(size, priority);
1366 if (mem)
1367 return mem;
1368 atomic_sub(size, &sk->sk_omem_alloc);
1369 }
1370 return NULL;
1371}
2a91525c 1372EXPORT_SYMBOL(sock_kmalloc);
1da177e4
LT		 1373
1374/*
1375 * Free an option memory block.
1376 */
1377void sock_kfree_s(struct sock *sk, void *mem, int size)
1378{
1379 kfree(mem);
1380 atomic_sub(size, &sk->sk_omem_alloc);
1381}
2a91525c 1382EXPORT_SYMBOL(sock_kfree_s);
1da177e4
LT		 1383
1384/* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
1385 I think, these locks should be removed for datagram sockets.
1386 */
2a91525c 1387static long sock_wait_for_wmem(struct sock *sk, long timeo)
1da177e4
LT		 1388{
1389 DEFINE_WAIT(wait);
1390
1391 clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1392 for (;;) {
1393 if (!timeo)
1394 break;
1395 if (signal_pending(current))
1396 break;
1397 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
aa395145 1398 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1da177e4
LT		 1399 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf)
1400 break;
1401 if (sk->sk_shutdown & SEND_SHUTDOWN)
1402 break;
1403 if (sk->sk_err)
1404 break;
1405 timeo = schedule_timeout(timeo);
1406 }
aa395145 1407 finish_wait(sk_sleep(sk), &wait);
1da177e4
LT		 1408 return timeo;
1409}
1410
1411
1412/*
1413 * Generic send/receive buffer handlers
1414 */
1415
4cc7f68d
HX		 1416struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len,
1417 unsigned long data_len, int noblock,
1418 int *errcode)
1da177e4
LT		 1419{
1420 struct sk_buff *skb;
7d877f3b 1421 gfp_t gfp_mask;
1da177e4
LT		 1422 long timeo;
1423 int err;
1424
1425 gfp_mask = sk->sk_allocation;
1426 if (gfp_mask & __GFP_WAIT)
1427 gfp_mask |= __GFP_REPEAT;
1428
1429 timeo = sock_sndtimeo(sk, noblock);
1430 while (1) {
1431 err = sock_error(sk);
1432 if (err != 0)
1433 goto failure;
1434
1435 err = -EPIPE;
1436 if (sk->sk_shutdown & SEND_SHUTDOWN)
1437 goto failure;
1438
1439 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
db38c179 1440 skb = alloc_skb(header_len, gfp_mask);
1da177e4
LT		 1441 if (skb) {
1442 int npages;
1443 int i;
1444
1445 /* No pages, we're done... */
1446 if (!data_len)
1447 break;
1448
1449 npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
1450 skb->truesize += data_len;
1451 skb_shinfo(skb)->nr_frags = npages;
1452 for (i = 0; i < npages; i++) {
1453 struct page *page;
1454 skb_frag_t *frag;
1455
1456 page = alloc_pages(sk->sk_allocation, 0);
1457 if (!page) {
1458 err = -ENOBUFS;
1459 skb_shinfo(skb)->nr_frags = i;
1460 kfree_skb(skb);
1461 goto failure;
1462 }
1463
1464 frag = &skb_shinfo(skb)->frags[i];
1465 frag->page = page;
1466 frag->page_offset = 0;
1467 frag->size = (data_len >= PAGE_SIZE ?
1468 PAGE_SIZE :
1469 data_len);
1470 data_len -= PAGE_SIZE;
1471 }
1472
1473 /* Full success... */
1474 break;
1475 }
1476 err = -ENOBUFS;
1477 goto failure;
1478 }
1479 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1480 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1481 err = -EAGAIN;
1482 if (!timeo)
1483 goto failure;
1484 if (signal_pending(current))
1485 goto interrupted;
1486 timeo = sock_wait_for_wmem(sk, timeo);
1487 }
1488
1489 skb_set_owner_w(skb, sk);
1490 return skb;
1491
1492interrupted:
1493 err = sock_intr_errno(timeo);
1494failure:
1495 *errcode = err;
1496 return NULL;
1497}
4cc7f68d 1498EXPORT_SYMBOL(sock_alloc_send_pskb);
1da177e4 1499
4ec93edb 1500struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
1da177e4
LT		 1501 int noblock, int *errcode)
1502{
1503 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode);
1504}
2a91525c 1505EXPORT_SYMBOL(sock_alloc_send_skb);
1da177e4
LT		 1506
1507static void __lock_sock(struct sock *sk)
1508{
1509 DEFINE_WAIT(wait);
1510
e71a4783 1511 for (;;) {
1da177e4
LT		 1512 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
1513 TASK_UNINTERRUPTIBLE);
1514 spin_unlock_bh(&sk->sk_lock.slock);
1515 schedule();
1516 spin_lock_bh(&sk->sk_lock.slock);
e71a4783 1517 if (!sock_owned_by_user(sk))
1da177e4
LT		 1518 break;
1519 }
1520 finish_wait(&sk->sk_lock.wq, &wait);
1521}
1522
1523static void __release_sock(struct sock *sk)
1524{
1525 struct sk_buff *skb = sk->sk_backlog.head;
1526
1527 do {
1528 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
1529 bh_unlock_sock(sk);
1530
1531 do {
1532 struct sk_buff *next = skb->next;
1533
1534 skb->next = NULL;
c57943a1 1535 sk_backlog_rcv(sk, skb);
1da177e4
LT		 1536
1537 /*
1538 * We are in process context here with softirqs
1539 * disabled, use cond_resched_softirq() to preempt.
1540 * This is safe to do because we've taken the backlog
1541 * queue private:
1542 */
1543 cond_resched_softirq();
1544
1545 skb = next;
1546 } while (skb != NULL);
1547
1548 bh_lock_sock(sk);
e71a4783 1549 } while ((skb = sk->sk_backlog.head) != NULL);
8eae939f
ZY		 1550
1551 /*
1552 * Doing the zeroing here guarantee we can not loop forever
1553 * while a wild producer attempts to flood us.
1554 */
1555 sk->sk_backlog.len = 0;
1da177e4
LT		 1556}
1557
1558/**
1559 * sk_wait_data - wait for data to arrive at sk_receive_queue
4dc3b16b
PP		 1560 * @sk: sock to wait on
1561 * @timeo: for how long
1da177e4
LT		 1562 *
1563 * Now socket state including sk->sk_err is changed only under lock,
1564 * hence we may omit checks after joining wait queue.
1565 * We check receive queue before schedule() only as optimization;
1566 * it is very likely that release_sock() added new data.
1567 */
1568int sk_wait_data(struct sock *sk, long *timeo)
1569{
1570 int rc;
1571 DEFINE_WAIT(wait);
1572
aa395145 1573 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1da177e4
LT		 1574 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1575 rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue));
1576 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
aa395145 1577 finish_wait(sk_sleep(sk), &wait);
1da177e4
LT		 1578 return rc;
1579}
1da177e4
LT		 1580EXPORT_SYMBOL(sk_wait_data);
1581
3ab224be
HA		 1582/**
1583 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated
1584 * @sk: socket
1585 * @size: memory size to allocate
1586 * @kind: allocation type
1587 *
1588 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means
1589 * rmem allocation. This function assumes that protocols which have
1590 * memory_pressure use sk_wmem_queued as write buffer accounting.
1591 */
1592int __sk_mem_schedule(struct sock *sk, int size, int kind)
1593{
1594 struct proto *prot = sk->sk_prot;
1595 int amt = sk_mem_pages(size);
1596 int allocated;
1597
1598 sk->sk_forward_alloc += amt * SK_MEM_QUANTUM;
1599 allocated = atomic_add_return(amt, prot->memory_allocated);
1600
1601 /* Under limit. */
1602 if (allocated <= prot->sysctl_mem[0]) {
1603 if (prot->memory_pressure && *prot->memory_pressure)
1604 *prot->memory_pressure = 0;
1605 return 1;
1606 }
1607
1608 /* Under pressure. */
1609 if (allocated > prot->sysctl_mem[1])
1610 if (prot->enter_memory_pressure)
5c52ba17 1611 prot->enter_memory_pressure(sk);
3ab224be
HA		 1612
1613 /* Over hard limit. */
1614 if (allocated > prot->sysctl_mem[2])
1615 goto suppress_allocation;
1616
1617 /* guarantee minimum buffer size under pressure */
1618 if (kind == SK_MEM_RECV) {
1619 if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0])
1620 return 1;
1621 } else { /* SK_MEM_SEND */
1622 if (sk->sk_type == SOCK_STREAM) {
1623 if (sk->sk_wmem_queued < prot->sysctl_wmem[0])
1624 return 1;
1625 } else if (atomic_read(&sk->sk_wmem_alloc) <
1626 prot->sysctl_wmem[0])
1627 return 1;
1628 }
1629
1630 if (prot->memory_pressure) {
1748376b
ED		 1631 int alloc;
1632
1633 if (!*prot->memory_pressure)
1634 return 1;
1635 alloc = percpu_counter_read_positive(prot->sockets_allocated);
1636 if (prot->sysctl_mem[2] > alloc *
3ab224be
HA		 1637 sk_mem_pages(sk->sk_wmem_queued +
1638 atomic_read(&sk->sk_rmem_alloc) +
1639 sk->sk_forward_alloc))
1640 return 1;
1641 }
1642
1643suppress_allocation:
1644
1645 if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) {
1646 sk_stream_moderate_sndbuf(sk);
1647
1648 /* Fail only if socket is _under_ its sndbuf.
1649 * In this case we cannot block, so that we have to fail.
1650 */
1651 if (sk->sk_wmem_queued + size >= sk->sk_sndbuf)
1652 return 1;
1653 }
1654
1655 /* Alas. Undo changes. */
1656 sk->sk_forward_alloc -= amt * SK_MEM_QUANTUM;
1657 atomic_sub(amt, prot->memory_allocated);
1658 return 0;
1659}
3ab224be
HA		 1660EXPORT_SYMBOL(__sk_mem_schedule);
1661
1662/**
1663 * __sk_reclaim - reclaim memory_allocated
1664 * @sk: socket
1665 */
1666void __sk_mem_reclaim(struct sock *sk)
1667{
1668 struct proto *prot = sk->sk_prot;
1669
680a5a50 1670 atomic_sub(sk->sk_forward_alloc >> SK_MEM_QUANTUM_SHIFT,
3ab224be
HA		 1671 prot->memory_allocated);
1672 sk->sk_forward_alloc &= SK_MEM_QUANTUM - 1;
1673
1674 if (prot->memory_pressure && *prot->memory_pressure &&
1675 (atomic_read(prot->memory_allocated) < prot->sysctl_mem[0]))
1676 *prot->memory_pressure = 0;
1677}
3ab224be
HA		 1678EXPORT_SYMBOL(__sk_mem_reclaim);
1679
1680
1da177e4
LT		 1681/*
1682 * Set of default routines for initialising struct proto_ops when
1683 * the protocol does not support a particular function. In certain
1684 * cases where it makes no sense for a protocol to have a "do nothing"
1685 * function, some default processing is provided.
1686 */
1687
1688int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
1689{
1690 return -EOPNOTSUPP;
1691}
2a91525c 1692EXPORT_SYMBOL(sock_no_bind);
1da177e4 1693
4ec93edb 1694int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 1695 int len, int flags)
1696{
1697 return -EOPNOTSUPP;
1698}
2a91525c 1699EXPORT_SYMBOL(sock_no_connect);
1da177e4
LT		 1700
1701int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
1702{
1703 return -EOPNOTSUPP;
1704}
2a91525c 1705EXPORT_SYMBOL(sock_no_socketpair);
1da177e4
LT		 1706
1707int sock_no_accept(struct socket *sock, struct socket *newsock, int flags)
1708{
1709 return -EOPNOTSUPP;
1710}
2a91525c 1711EXPORT_SYMBOL(sock_no_accept);
1da177e4 1712
4ec93edb 1713int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 1714 int *len, int peer)
1715{
1716 return -EOPNOTSUPP;
1717}
2a91525c 1718EXPORT_SYMBOL(sock_no_getname);
1da177e4 1719
2a91525c 1720unsigned int sock_no_poll(struct file *file, struct socket *sock, poll_table *pt)
1da177e4
LT		 1721{
1722 return 0;
1723}
2a91525c 1724EXPORT_SYMBOL(sock_no_poll);
1da177e4
LT		 1725
1726int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1727{
1728 return -EOPNOTSUPP;
1729}
2a91525c 1730EXPORT_SYMBOL(sock_no_ioctl);
1da177e4
LT		 1731
1732int sock_no_listen(struct socket *sock, int backlog)
1733{
1734 return -EOPNOTSUPP;
1735}
2a91525c 1736EXPORT_SYMBOL(sock_no_listen);
1da177e4
LT		 1737
1738int sock_no_shutdown(struct socket *sock, int how)
1739{
1740 return -EOPNOTSUPP;
1741}
2a91525c 1742EXPORT_SYMBOL(sock_no_shutdown);
1da177e4
LT		 1743
1744int sock_no_setsockopt(struct socket *sock, int level, int optname,
b7058842 1745 char __user *optval, unsigned int optlen)
1da177e4
LT		 1746{
1747 return -EOPNOTSUPP;
1748}
2a91525c 1749EXPORT_SYMBOL(sock_no_setsockopt);
1da177e4
LT		 1750
1751int sock_no_getsockopt(struct socket *sock, int level, int optname,
1752 char __user *optval, int __user *optlen)
1753{
1754 return -EOPNOTSUPP;
1755}
2a91525c 1756EXPORT_SYMBOL(sock_no_getsockopt);
1da177e4
LT		 1757
1758int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
1759 size_t len)
1760{
1761 return -EOPNOTSUPP;
1762}
2a91525c 1763EXPORT_SYMBOL(sock_no_sendmsg);
1da177e4
LT		 1764
1765int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
1766 size_t len, int flags)
1767{
1768 return -EOPNOTSUPP;
1769}
2a91525c 1770EXPORT_SYMBOL(sock_no_recvmsg);
1da177e4
LT		 1771
1772int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
1773{
1774 /* Mirror missing mmap method error code */
1775 return -ENODEV;
1776}
2a91525c 1777EXPORT_SYMBOL(sock_no_mmap);
1da177e4
LT		 1778
1779ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
1780{
1781 ssize_t res;
1782 struct msghdr msg = {.msg_flags = flags};
1783 struct kvec iov;
1784 char *kaddr = kmap(page);
1785 iov.iov_base = kaddr + offset;
1786 iov.iov_len = size;
1787 res = kernel_sendmsg(sock, &msg, &iov, 1, size);
1788 kunmap(page);
1789 return res;
1790}
2a91525c 1791EXPORT_SYMBOL(sock_no_sendpage);
1da177e4
LT		 1792
1793/*
1794 * Default Socket Callbacks
1795 */
1796
1797static void sock_def_wakeup(struct sock *sk)
1798{
1799 read_lock(&sk->sk_callback_lock);
a57de0b4 1800 if (sk_has_sleeper(sk))
aa395145 1801 wake_up_interruptible_all(sk_sleep(sk));
1da177e4
LT		 1802 read_unlock(&sk->sk_callback_lock);
1803}
1804
1805static void sock_def_error_report(struct sock *sk)
1806{
1807 read_lock(&sk->sk_callback_lock);
a57de0b4 1808 if (sk_has_sleeper(sk))
aa395145 1809 wake_up_interruptible_poll(sk_sleep(sk), POLLERR);
8d8ad9d7 1810 sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR);
1da177e4
LT		 1811 read_unlock(&sk->sk_callback_lock);
1812}
1813
1814static void sock_def_readable(struct sock *sk, int len)
1815{
1816 read_lock(&sk->sk_callback_lock);
a57de0b4 1817 if (sk_has_sleeper(sk))
aa395145 1818 wake_up_interruptible_sync_poll(sk_sleep(sk), POLLIN |
37e5540b 1819 POLLRDNORM | POLLRDBAND);
8d8ad9d7 1820 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
1da177e4
LT		 1821 read_unlock(&sk->sk_callback_lock);
1822}
1823
1824static void sock_def_write_space(struct sock *sk)
1825{
1826 read_lock(&sk->sk_callback_lock);
1827
1828 /* Do not wake up a writer until he can make "significant"
1829 * progress. --DaveM
1830 */
e71a4783 1831 if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) {
a57de0b4 1832 if (sk_has_sleeper(sk))
aa395145 1833 wake_up_interruptible_sync_poll(sk_sleep(sk), POLLOUT |
37e5540b 1834 POLLWRNORM | POLLWRBAND);
1da177e4
LT		 1835
1836 /* Should agree with poll, otherwise some programs break */
1837 if (sock_writeable(sk))
8d8ad9d7 1838 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
1da177e4
LT		 1839 }
1840
1841 read_unlock(&sk->sk_callback_lock);
1842}
1843
1844static void sock_def_destruct(struct sock *sk)
1845{
a51482bd 1846 kfree(sk->sk_protinfo);
1da177e4
LT		 1847}
1848
1849void sk_send_sigurg(struct sock *sk)
1850{
1851 if (sk->sk_socket && sk->sk_socket->file)
1852 if (send_sigurg(&sk->sk_socket->file->f_owner))
8d8ad9d7 1853 sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI);
1da177e4 1854}
2a91525c 1855EXPORT_SYMBOL(sk_send_sigurg);
1da177e4
LT		 1856
1857void sk_reset_timer(struct sock *sk, struct timer_list* timer,
1858 unsigned long expires)
1859{
1860 if (!mod_timer(timer, expires))
1861 sock_hold(sk);
1862}
1da177e4
LT		 1863EXPORT_SYMBOL(sk_reset_timer);
1864
1865void sk_stop_timer(struct sock *sk, struct timer_list* timer)
1866{
1867 if (timer_pending(timer) && del_timer(timer))
1868 __sock_put(sk);
1869}
1da177e4
LT		 1870EXPORT_SYMBOL(sk_stop_timer);
1871
1872void sock_init_data(struct socket *sock, struct sock *sk)
1873{
1874 skb_queue_head_init(&sk->sk_receive_queue);
1875 skb_queue_head_init(&sk->sk_write_queue);
1876 skb_queue_head_init(&sk->sk_error_queue);
97fc2f08
CL		 1877#ifdef CONFIG_NET_DMA
1878 skb_queue_head_init(&sk->sk_async_wait_queue);
1879#endif
1da177e4
LT		 1880
1881 sk->sk_send_head = NULL;
1882
1883 init_timer(&sk->sk_timer);
4ec93edb 1884
1da177e4
LT		 1885 sk->sk_allocation = GFP_KERNEL;
1886 sk->sk_rcvbuf = sysctl_rmem_default;
1887 sk->sk_sndbuf = sysctl_wmem_default;
8eae939f 1888 sk->sk_backlog.limit = sk->sk_rcvbuf << 1;
1da177e4 1889 sk->sk_state = TCP_CLOSE;
972692e0 1890 sk_set_socket(sk, sock);
1da177e4
LT		 1891
1892 sock_set_flag(sk, SOCK_ZAPPED);
1893
e71a4783 1894 if (sock) {
1da177e4
LT		 1895 sk->sk_type = sock->type;
1896 sk->sk_sleep = &sock->wait;
1897 sock->sk = sk;
1898 } else
1899 sk->sk_sleep = NULL;
1900
b6c6712a 1901 spin_lock_init(&sk->sk_dst_lock);
1da177e4 1902 rwlock_init(&sk->sk_callback_lock);
443aef0e
PZ		 1903 lockdep_set_class_and_name(&sk->sk_callback_lock,
1904 af_callback_keys + sk->sk_family,
1905 af_family_clock_key_strings[sk->sk_family]);
1da177e4
LT		 1906
1907 sk->sk_state_change = sock_def_wakeup;
1908 sk->sk_data_ready = sock_def_readable;
1909 sk->sk_write_space = sock_def_write_space;
1910 sk->sk_error_report = sock_def_error_report;
1911 sk->sk_destruct = sock_def_destruct;
1912
1913 sk->sk_sndmsg_page = NULL;
1914 sk->sk_sndmsg_off = 0;
1915
1916 sk->sk_peercred.pid = 0;
1917 sk->sk_peercred.uid = -1;
1918 sk->sk_peercred.gid = -1;
1919 sk->sk_write_pending = 0;
1920 sk->sk_rcvlowat = 1;
1921 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
1922 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
1923
f37f0afb 1924 sk->sk_stamp = ktime_set(-1L, 0);
1da177e4 1925
4dc6dc71
ED		 1926 /*
1927 * Before updating sk_refcnt, we must commit prior changes to memory
1928 * (Documentation/RCU/rculist_nulls.txt for details)
1929 */
1930 smp_wmb();
1da177e4 1931 atomic_set(&sk->sk_refcnt, 1);
33c732c3 1932 atomic_set(&sk->sk_drops, 0);
1da177e4 1933}
2a91525c 1934EXPORT_SYMBOL(sock_init_data);
1da177e4 1935
b5606c2d 1936void lock_sock_nested(struct sock *sk, int subclass)
1da177e4
LT		 1937{
1938 might_sleep();
a5b5bb9a 1939 spin_lock_bh(&sk->sk_lock.slock);
d2e9117c 1940 if (sk->sk_lock.owned)
1da177e4 1941 __lock_sock(sk);
d2e9117c 1942 sk->sk_lock.owned = 1;
a5b5bb9a
IM		 1943 spin_unlock(&sk->sk_lock.slock);
1944 /*
1945 * The sk_lock has mutex_lock() semantics here:
1946 */
fcc70d5f 1947 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
a5b5bb9a 1948 local_bh_enable();
1da177e4 1949}
fcc70d5f 1950EXPORT_SYMBOL(lock_sock_nested);
1da177e4 1951
b5606c2d 1952void release_sock(struct sock *sk)
1da177e4 1953{
a5b5bb9a
IM		 1954 /*
1955 * The sk_lock has mutex_unlock() semantics:
1956 */
1957 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
1958
1959 spin_lock_bh(&sk->sk_lock.slock);
1da177e4
LT		 1960 if (sk->sk_backlog.tail)
1961 __release_sock(sk);
d2e9117c 1962 sk->sk_lock.owned = 0;
a5b5bb9a
IM		 1963 if (waitqueue_active(&sk->sk_lock.wq))
1964 wake_up(&sk->sk_lock.wq);
1965 spin_unlock_bh(&sk->sk_lock.slock);
1da177e4
LT		 1966}
1967EXPORT_SYMBOL(release_sock);
1968
1969int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
4ec93edb 1970{
b7aa0bf7 1971 struct timeval tv;
1da177e4 1972 if (!sock_flag(sk, SOCK_TIMESTAMP))
20d49473 1973 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
b7aa0bf7
ED		 1974 tv = ktime_to_timeval(sk->sk_stamp);
1975 if (tv.tv_sec == -1)
1da177e4 1976 return -ENOENT;
b7aa0bf7
ED		 1977 if (tv.tv_sec == 0) {
1978 sk->sk_stamp = ktime_get_real();
1979 tv = ktime_to_timeval(sk->sk_stamp);
1980 }
1981 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0;
4ec93edb 1982}
1da177e4
LT		 1983EXPORT_SYMBOL(sock_get_timestamp);
1984
ae40eb1e
ED		 1985int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
1986{
1987 struct timespec ts;
1988 if (!sock_flag(sk, SOCK_TIMESTAMP))
20d49473 1989 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
ae40eb1e
ED		 1990 ts = ktime_to_timespec(sk->sk_stamp);
1991 if (ts.tv_sec == -1)
1992 return -ENOENT;
1993 if (ts.tv_sec == 0) {
1994 sk->sk_stamp = ktime_get_real();
1995 ts = ktime_to_timespec(sk->sk_stamp);
1996 }
1997 return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0;
1998}
1999EXPORT_SYMBOL(sock_get_timestampns);
2000
20d49473 2001void sock_enable_timestamp(struct sock *sk, int flag)
4ec93edb 2002{
20d49473
PO		 2003 if (!sock_flag(sk, flag)) {
2004 sock_set_flag(sk, flag);
2005 /*
2006 * we just set one of the two flags which require net
2007 * time stamping, but time stamping might have been on
2008 * already because of the other one
2009 */
2010 if (!sock_flag(sk,
2011 flag == SOCK_TIMESTAMP ?
2012 SOCK_TIMESTAMPING_RX_SOFTWARE :
2013 SOCK_TIMESTAMP))
2014 net_enable_timestamp();
1da177e4
LT		 2015 }
2016}
1da177e4
LT		 2017
2018/*
2019 * Get a socket option on an socket.
2020 *
2021 * FIX: POSIX 1003.1g is very ambiguous here. It states that
2022 * asynchronous errors should be reported by getsockopt. We assume
2023 * this means if you specify SO_ERROR (otherwise whats the point of it).
2024 */
2025int sock_common_getsockopt(struct socket *sock, int level, int optname,
2026 char __user *optval, int __user *optlen)
2027{
2028 struct sock *sk = sock->sk;
2029
2030 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2031}
1da177e4
LT		 2032EXPORT_SYMBOL(sock_common_getsockopt);
2033
3fdadf7d 2034#ifdef CONFIG_COMPAT
543d9cfe
ACM		 2035int compat_sock_common_getsockopt(struct socket *sock, int level, int optname,
2036 char __user *optval, int __user *optlen)
3fdadf7d
DM		 2037{
2038 struct sock *sk = sock->sk;
2039
1e51f951 2040 if (sk->sk_prot->compat_getsockopt != NULL)
543d9cfe
ACM		 2041 return sk->sk_prot->compat_getsockopt(sk, level, optname,
2042 optval, optlen);
3fdadf7d
DM		 2043 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2044}
2045EXPORT_SYMBOL(compat_sock_common_getsockopt);
2046#endif
2047
1da177e4
LT		 2048int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock,
2049 struct msghdr *msg, size_t size, int flags)
2050{
2051 struct sock *sk = sock->sk;
2052 int addr_len = 0;
2053 int err;
2054
2055 err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT,
2056 flags & ~MSG_DONTWAIT, &addr_len);
2057 if (err >= 0)
2058 msg->msg_namelen = addr_len;
2059 return err;
2060}
1da177e4
LT		 2061EXPORT_SYMBOL(sock_common_recvmsg);
2062
2063/*
2064 * Set socket options on an inet socket.
2065 */
2066int sock_common_setsockopt(struct socket *sock, int level, int optname,
b7058842 2067 char __user *optval, unsigned int optlen)
1da177e4
LT		 2068{
2069 struct sock *sk = sock->sk;
2070
2071 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2072}
1da177e4
LT		 2073EXPORT_SYMBOL(sock_common_setsockopt);
2074
3fdadf7d 2075#ifdef CONFIG_COMPAT
543d9cfe 2076int compat_sock_common_setsockopt(struct socket *sock, int level, int optname,
b7058842 2077 char __user *optval, unsigned int optlen)
3fdadf7d
DM		 2078{
2079 struct sock *sk = sock->sk;
2080
543d9cfe
ACM		 2081 if (sk->sk_prot->compat_setsockopt != NULL)
2082 return sk->sk_prot->compat_setsockopt(sk, level, optname,
2083 optval, optlen);
3fdadf7d
DM		 2084 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2085}
2086EXPORT_SYMBOL(compat_sock_common_setsockopt);
2087#endif
2088
1da177e4
LT		 2089void sk_common_release(struct sock *sk)
2090{
2091 if (sk->sk_prot->destroy)
2092 sk->sk_prot->destroy(sk);
2093
2094 /*
2095 * Observation: when sock_common_release is called, processes have
2096 * no access to socket. But net still has.
2097 * Step one, detach it from networking:
2098 *
2099 * A. Remove from hash tables.
2100 */
2101
2102 sk->sk_prot->unhash(sk);
2103
2104 /*
2105 * In this point socket cannot receive new packets, but it is possible
2106 * that some packets are in flight because some CPU runs receiver and
2107 * did hash table lookup before we unhashed socket. They will achieve
2108 * receive queue and will be purged by socket destructor.
2109 *
2110 * Also we still have packets pending on receive queue and probably,
2111 * our own packets waiting in device queues. sock_destroy will drain
2112 * receive queue, but transmitted packets will delay socket destruction
2113 * until the last reference will be released.
2114 */
2115
2116 sock_orphan(sk);
2117
2118 xfrm_sk_free_policy(sk);
2119
e6848976 2120 sk_refcnt_debug_release(sk);
1da177e4
LT		 2121 sock_put(sk);
2122}
1da177e4
LT		 2123EXPORT_SYMBOL(sk_common_release);
2124
2125static DEFINE_RWLOCK(proto_list_lock);
2126static LIST_HEAD(proto_list);
2127
13ff3d6f
PE		 2128#ifdef CONFIG_PROC_FS
2129#define PROTO_INUSE_NR 64 /* should be enough for the first time */
1338d466
PE		 2130struct prot_inuse {
2131 int val[PROTO_INUSE_NR];
2132};
13ff3d6f
PE		 2133
2134static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR);
70ee1159
PE		 2135
2136#ifdef CONFIG_NET_NS
2137void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
2138{
2139 int cpu = smp_processor_id();
2140 per_cpu_ptr(net->core.inuse, cpu)->val[prot->inuse_idx] += val;
2141}
2142EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2143
2144int sock_prot_inuse_get(struct net *net, struct proto *prot)
2145{
2146 int cpu, idx = prot->inuse_idx;
2147 int res = 0;
2148
2149 for_each_possible_cpu(cpu)
2150 res += per_cpu_ptr(net->core.inuse, cpu)->val[idx];
2151
2152 return res >= 0 ? res : 0;
2153}
2154EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
2155
2c8c1e72 2156static int __net_init sock_inuse_init_net(struct net *net)
70ee1159
PE		 2157{
2158 net->core.inuse = alloc_percpu(struct prot_inuse);
2159 return net->core.inuse ? 0 : -ENOMEM;
2160}
2161
2c8c1e72 2162static void __net_exit sock_inuse_exit_net(struct net *net)
70ee1159
PE		 2163{
2164 free_percpu(net->core.inuse);
2165}
2166
2167static struct pernet_operations net_inuse_ops = {
2168 .init = sock_inuse_init_net,
2169 .exit = sock_inuse_exit_net,
2170};
2171
2172static __init int net_inuse_init(void)
2173{
2174 if (register_pernet_subsys(&net_inuse_ops))
2175 panic("Cannot initialize net inuse counters");
2176
2177 return 0;
2178}
2179
2180core_initcall(net_inuse_init);
2181#else
1338d466
PE		 2182static DEFINE_PER_CPU(struct prot_inuse, prot_inuse);
2183
c29a0bc4 2184void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
1338d466
PE		 2185{
2186 __get_cpu_var(prot_inuse).val[prot->inuse_idx] += val;
2187}
2188EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2189
c29a0bc4 2190int sock_prot_inuse_get(struct net *net, struct proto *prot)
1338d466
PE		 2191{
2192 int cpu, idx = prot->inuse_idx;
2193 int res = 0;
2194
2195 for_each_possible_cpu(cpu)
2196 res += per_cpu(prot_inuse, cpu).val[idx];
2197
2198 return res >= 0 ? res : 0;
2199}
2200EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
70ee1159 2201#endif
13ff3d6f
PE		 2202
2203static void assign_proto_idx(struct proto *prot)
2204{
2205 prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR);
2206
2207 if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) {
2208 printk(KERN_ERR "PROTO_INUSE_NR exhausted\n");
2209 return;
2210 }
2211
2212 set_bit(prot->inuse_idx, proto_inuse_idx);
2213}
2214
2215static void release_proto_idx(struct proto *prot)
2216{
2217 if (prot->inuse_idx != PROTO_INUSE_NR - 1)
2218 clear_bit(prot->inuse_idx, proto_inuse_idx);
2219}
2220#else
2221static inline void assign_proto_idx(struct proto *prot)
2222{
2223}
2224
2225static inline void release_proto_idx(struct proto *prot)
2226{
2227}
2228#endif
2229
b733c007
PE		 2230int proto_register(struct proto *prot, int alloc_slab)
2231{
1da177e4
LT		 2232 if (alloc_slab) {
2233 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0,
271b72c7
ED		 2234 SLAB_HWCACHE_ALIGN | prot->slab_flags,
2235 NULL);
1da177e4
LT		 2236
2237 if (prot->slab == NULL) {
2238 printk(KERN_CRIT "%s: Can't create sock SLAB cache!\n",
2239 prot->name);
60e7663d 2240 goto out;
1da177e4 2241 }
2e6599cb
ACM		 2242
2243 if (prot->rsk_prot != NULL) {
faf23422 2244 prot->rsk_prot->slab_name = kasprintf(GFP_KERNEL, "request_sock_%s", prot->name);
7e56b5d6 2245 if (prot->rsk_prot->slab_name == NULL)
2e6599cb
ACM		 2246 goto out_free_sock_slab;
2247
7e56b5d6 2248 prot->rsk_prot->slab = kmem_cache_create(prot->rsk_prot->slab_name,
2e6599cb 2249 prot->rsk_prot->obj_size, 0,
20c2df83 2250 SLAB_HWCACHE_ALIGN, NULL);
2e6599cb
ACM		 2251
2252 if (prot->rsk_prot->slab == NULL) {
2253 printk(KERN_CRIT "%s: Can't create request sock SLAB cache!\n",
2254 prot->name);
2255 goto out_free_request_sock_slab_name;
2256 }
2257 }
8feaf0c0 2258
6d6ee43e 2259 if (prot->twsk_prot != NULL) {
faf23422 2260 prot->twsk_prot->twsk_slab_name = kasprintf(GFP_KERNEL, "tw_sock_%s", prot->name);
8feaf0c0 2261
7e56b5d6 2262 if (prot->twsk_prot->twsk_slab_name == NULL)
8feaf0c0
ACM		 2263 goto out_free_request_sock_slab;
2264
6d6ee43e 2265 prot->twsk_prot->twsk_slab =
7e56b5d6 2266 kmem_cache_create(prot->twsk_prot->twsk_slab_name,
6d6ee43e 2267 prot->twsk_prot->twsk_obj_size,
3ab5aee7
ED		 2268 0,
2269 SLAB_HWCACHE_ALIGN |
2270 prot->slab_flags,
20c2df83 2271 NULL);
6d6ee43e 2272 if (prot->twsk_prot->twsk_slab == NULL)
8feaf0c0
ACM		 2273 goto out_free_timewait_sock_slab_name;
2274 }
1da177e4
LT		 2275 }
2276
2a278051 2277 write_lock(&proto_list_lock);
1da177e4 2278 list_add(&prot->node, &proto_list);
13ff3d6f 2279 assign_proto_idx(prot);
1da177e4 2280 write_unlock(&proto_list_lock);
b733c007
PE		 2281 return 0;
2282
8feaf0c0 2283out_free_timewait_sock_slab_name:
7e56b5d6 2284 kfree(prot->twsk_prot->twsk_slab_name);
8feaf0c0
ACM		 2285out_free_request_sock_slab:
2286 if (prot->rsk_prot && prot->rsk_prot->slab) {
2287 kmem_cache_destroy(prot->rsk_prot->slab);
2288 prot->rsk_prot->slab = NULL;
2289 }
2e6599cb 2290out_free_request_sock_slab_name:
72150e9b
DC		 2291 if (prot->rsk_prot)
2292 kfree(prot->rsk_prot->slab_name);
2e6599cb
ACM		 2293out_free_sock_slab:
2294 kmem_cache_destroy(prot->slab);
2295 prot->slab = NULL;
b733c007
PE		 2296out:
2297 return -ENOBUFS;
1da177e4 2298}
1da177e4
LT		 2299EXPORT_SYMBOL(proto_register);
2300
2301void proto_unregister(struct proto *prot)
2302{
2303 write_lock(&proto_list_lock);
13ff3d6f 2304 release_proto_idx(prot);
0a3f4358
PM		 2305 list_del(&prot->node);
2306 write_unlock(&proto_list_lock);
1da177e4
LT		 2307
2308 if (prot->slab != NULL) {
2309 kmem_cache_destroy(prot->slab);
2310 prot->slab = NULL;
2311 }
2312
2e6599cb 2313 if (prot->rsk_prot != NULL && prot->rsk_prot->slab != NULL) {
2e6599cb 2314 kmem_cache_destroy(prot->rsk_prot->slab);
7e56b5d6 2315 kfree(prot->rsk_prot->slab_name);
2e6599cb
ACM		 2316 prot->rsk_prot->slab = NULL;
2317 }
2318
6d6ee43e 2319 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) {
6d6ee43e 2320 kmem_cache_destroy(prot->twsk_prot->twsk_slab);
7e56b5d6 2321 kfree(prot->twsk_prot->twsk_slab_name);
6d6ee43e 2322 prot->twsk_prot->twsk_slab = NULL;
8feaf0c0 2323 }
1da177e4 2324}
1da177e4
LT		 2325EXPORT_SYMBOL(proto_unregister);
2326
2327#ifdef CONFIG_PROC_FS
1da177e4 2328static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
9a429c49 2329 __acquires(proto_list_lock)
1da177e4
LT		 2330{
2331 read_lock(&proto_list_lock);
60f0438a 2332 return seq_list_start_head(&proto_list, *pos);
1da177e4
LT		 2333}
2334
2335static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2336{
60f0438a 2337 return seq_list_next(v, &proto_list, pos);
1da177e4
LT		 2338}
2339
2340static void proto_seq_stop(struct seq_file *seq, void *v)
9a429c49 2341 __releases(proto_list_lock)
1da177e4
LT		 2342{
2343 read_unlock(&proto_list_lock);
2344}
2345
2346static char proto_method_implemented(const void *method)
2347{
2348 return method == NULL ? 'n' : 'y';
2349}
2350
2351static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
2352{
2353 seq_printf(seq, "%-9s %4u %6d %6d %-3s %6u %-3s %-10s "
2354 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
2355 proto->name,
2356 proto->obj_size,
14e943db 2357 sock_prot_inuse_get(seq_file_net(seq), proto),
1da177e4
LT		 2358 proto->memory_allocated != NULL ? atomic_read(proto->memory_allocated) : -1,
2359 proto->memory_pressure != NULL ? *proto->memory_pressure ? "yes" : "no" : "NI",
2360 proto->max_header,
2361 proto->slab == NULL ? "no" : "yes",
2362 module_name(proto->owner),
2363 proto_method_implemented(proto->close),
2364 proto_method_implemented(proto->connect),
2365 proto_method_implemented(proto->disconnect),
2366 proto_method_implemented(proto->accept),
2367 proto_method_implemented(proto->ioctl),
2368 proto_method_implemented(proto->init),
2369 proto_method_implemented(proto->destroy),
2370 proto_method_implemented(proto->shutdown),
2371 proto_method_implemented(proto->setsockopt),
2372 proto_method_implemented(proto->getsockopt),
2373 proto_method_implemented(proto->sendmsg),
2374 proto_method_implemented(proto->recvmsg),
2375 proto_method_implemented(proto->sendpage),
2376 proto_method_implemented(proto->bind),
2377 proto_method_implemented(proto->backlog_rcv),
2378 proto_method_implemented(proto->hash),
2379 proto_method_implemented(proto->unhash),
2380 proto_method_implemented(proto->get_port),
2381 proto_method_implemented(proto->enter_memory_pressure));
2382}
2383
2384static int proto_seq_show(struct seq_file *seq, void *v)
2385{
60f0438a 2386 if (v == &proto_list)
1da177e4
LT		 2387 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
2388 "protocol",
2389 "size",
2390 "sockets",
2391 "memory",
2392 "press",
2393 "maxhdr",
2394 "slab",
2395 "module",
2396 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
2397 else
60f0438a 2398 proto_seq_printf(seq, list_entry(v, struct proto, node));
1da177e4
LT		 2399 return 0;
2400}
2401
f690808e 2402static const struct seq_operations proto_seq_ops = {
1da177e4
LT		 2403 .start = proto_seq_start,
2404 .next = proto_seq_next,
2405 .stop = proto_seq_stop,
2406 .show = proto_seq_show,
2407};
2408
2409static int proto_seq_open(struct inode *inode, struct file *file)
2410{
14e943db
ED		 2411 return seq_open_net(inode, file, &proto_seq_ops,
2412 sizeof(struct seq_net_private));
1da177e4
LT		 2413}
2414
9a32144e 2415static const struct file_operations proto_seq_fops = {
1da177e4
LT		 2416 .owner = THIS_MODULE,
2417 .open = proto_seq_open,
2418 .read = seq_read,
2419 .llseek = seq_lseek,
14e943db
ED		 2420 .release = seq_release_net,
2421};
2422
2423static __net_init int proto_init_net(struct net *net)
2424{
2425 if (!proc_net_fops_create(net, "protocols", S_IRUGO, &proto_seq_fops))
2426 return -ENOMEM;
2427
2428 return 0;
2429}
2430
2431static __net_exit void proto_exit_net(struct net *net)
2432{
2433 proc_net_remove(net, "protocols");
2434}
2435
2436
2437static __net_initdata struct pernet_operations proto_net_ops = {
2438 .init = proto_init_net,
2439 .exit = proto_exit_net,
1da177e4
LT		 2440};
2441
2442static int __init proto_init(void)
2443{
14e943db 2444 return register_pernet_subsys(&proto_net_ops);
1da177e4
LT		 2445}
2446
2447subsys_initcall(proto_init);
2448
2449#endif /* PROC_FS */
kernel source for telekom puls (alcatel/mediatek)