projects / linux-2.6-block.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
rcu: Disable lockdep checking in RCU list-traversal primitives
[linux-2.6-block.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_);
343 } else
f0088a50
DV		 344 sk_add_backlog(sk, skb);
345 bh_unlock_sock(sk);
346out:
347 sock_put(sk);
348 return rc;
349discard_and_relse:
350 kfree_skb(skb);
351 goto out;
352}
353EXPORT_SYMBOL(sk_receive_skb);
354
ea94ff3b
KK		 355void sk_reset_txq(struct sock *sk)
356{
357 sk_tx_queue_clear(sk);
358}
359EXPORT_SYMBOL(sk_reset_txq);
360
f0088a50
DV		 361struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie)
362{
363 struct dst_entry *dst = sk->sk_dst_cache;
364
365 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
e022f0b4 366 sk_tx_queue_clear(sk);
f0088a50
DV		 367 sk->sk_dst_cache = NULL;
368 dst_release(dst);
369 return NULL;
370 }
371
372 return dst;
373}
374EXPORT_SYMBOL(__sk_dst_check);
375
376struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie)
377{
378 struct dst_entry *dst = sk_dst_get(sk);
379
380 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
381 sk_dst_reset(sk);
382 dst_release(dst);
383 return NULL;
384 }
385
386 return dst;
387}
388EXPORT_SYMBOL(sk_dst_check);
389
4878809f
DM		 390static int sock_bindtodevice(struct sock *sk, char __user *optval, int optlen)
391{
392 int ret = -ENOPROTOOPT;
393#ifdef CONFIG_NETDEVICES
3b1e0a65 394 struct net *net = sock_net(sk);
4878809f
DM		 395 char devname[IFNAMSIZ];
396 int index;
397
398 /* Sorry... */
399 ret = -EPERM;
400 if (!capable(CAP_NET_RAW))
401 goto out;
402
403 ret = -EINVAL;
404 if (optlen < 0)
405 goto out;
406
407 /* Bind this socket to a particular device like "eth0",
408 * as specified in the passed interface name. If the
409 * name is "" or the option length is zero the socket
410 * is not bound.
411 */
412 if (optlen > IFNAMSIZ - 1)
413 optlen = IFNAMSIZ - 1;
414 memset(devname, 0, sizeof(devname));
415
416 ret = -EFAULT;
417 if (copy_from_user(devname, optval, optlen))
418 goto out;
419
000ba2e4
DM		 420 index = 0;
421 if (devname[0] != '\0') {
bf8e56bf 422 struct net_device *dev;
4878809f 423
bf8e56bf
ED		 424 rcu_read_lock();
425 dev = dev_get_by_name_rcu(net, devname);
426 if (dev)
427 index = dev->ifindex;
428 rcu_read_unlock();
4878809f
DM		 429 ret = -ENODEV;
430 if (!dev)
431 goto out;
4878809f
DM		 432 }
433
434 lock_sock(sk);
435 sk->sk_bound_dev_if = index;
436 sk_dst_reset(sk);
437 release_sock(sk);
438
439 ret = 0;
440
441out:
442#endif
443
444 return ret;
445}
446
c0ef877b
PE		 447static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool)
448{
449 if (valbool)
450 sock_set_flag(sk, bit);
451 else
452 sock_reset_flag(sk, bit);
453}
454
1da177e4
LT		 455/*
456 * This is meant for all protocols to use and covers goings on
457 * at the socket level. Everything here is generic.
458 */
459
460int sock_setsockopt(struct socket *sock, int level, int optname,
b7058842 461 char __user *optval, unsigned int optlen)
1da177e4 462{
2a91525c 463 struct sock *sk = sock->sk;
1da177e4
LT		 464 int val;
465 int valbool;
466 struct linger ling;
467 int ret = 0;
4ec93edb 468
1da177e4
LT		 469 /*
470 * Options without arguments
471 */
472
4878809f
DM		 473 if (optname == SO_BINDTODEVICE)
474 return sock_bindtodevice(sk, optval, optlen);
475
e71a4783
SH		 476 if (optlen < sizeof(int))
477 return -EINVAL;
4ec93edb 478
1da177e4
LT		 479 if (get_user(val, (int __user *)optval))
480 return -EFAULT;
4ec93edb 481
2a91525c 482 valbool = val ? 1 : 0;
1da177e4
LT		 483
484 lock_sock(sk);
485
2a91525c 486 switch (optname) {
e71a4783 487 case SO_DEBUG:
2a91525c 488 if (val && !capable(CAP_NET_ADMIN))
e71a4783 489 ret = -EACCES;
2a91525c 490 else
c0ef877b 491 sock_valbool_flag(sk, SOCK_DBG, valbool);
e71a4783
SH		 492 break;
493 case SO_REUSEADDR:
494 sk->sk_reuse = valbool;
495 break;
496 case SO_TYPE:
49c794e9 497 case SO_PROTOCOL:
0d6038ee 498 case SO_DOMAIN:
e71a4783
SH		 499 case SO_ERROR:
500 ret = -ENOPROTOOPT;
501 break;
502 case SO_DONTROUTE:
c0ef877b 503 sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool);
e71a4783
SH		 504 break;
505 case SO_BROADCAST:
506 sock_valbool_flag(sk, SOCK_BROADCAST, valbool);
507 break;
508 case SO_SNDBUF:
509 /* Don't error on this BSD doesn't and if you think
510 about it this is right. Otherwise apps have to
511 play 'guess the biggest size' games. RCVBUF/SNDBUF
512 are treated in BSD as hints */
513
514 if (val > sysctl_wmem_max)
515 val = sysctl_wmem_max;
b0573dea 516set_sndbuf:
e71a4783
SH		 517 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
518 if ((val * 2) < SOCK_MIN_SNDBUF)
519 sk->sk_sndbuf = SOCK_MIN_SNDBUF;
520 else
521 sk->sk_sndbuf = val * 2;
1da177e4 522
e71a4783
SH		 523 /*
524 * Wake up sending tasks if we
525 * upped the value.
526 */
527 sk->sk_write_space(sk);
528 break;
1da177e4 529
e71a4783
SH		 530 case SO_SNDBUFFORCE:
531 if (!capable(CAP_NET_ADMIN)) {
532 ret = -EPERM;
533 break;
534 }
535 goto set_sndbuf;
b0573dea 536
e71a4783
SH		 537 case SO_RCVBUF:
538 /* Don't error on this BSD doesn't and if you think
539 about it this is right. Otherwise apps have to
540 play 'guess the biggest size' games. RCVBUF/SNDBUF
541 are treated in BSD as hints */
4ec93edb 542
e71a4783
SH		 543 if (val > sysctl_rmem_max)
544 val = sysctl_rmem_max;
b0573dea 545set_rcvbuf:
e71a4783
SH		 546 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
547 /*
548 * We double it on the way in to account for
549 * "struct sk_buff" etc. overhead. Applications
550 * assume that the SO_RCVBUF setting they make will
551 * allow that much actual data to be received on that
552 * socket.
553 *
554 * Applications are unaware that "struct sk_buff" and
555 * other overheads allocate from the receive buffer
556 * during socket buffer allocation.
557 *
558 * And after considering the possible alternatives,
559 * returning the value we actually used in getsockopt
560 * is the most desirable behavior.
561 */
562 if ((val * 2) < SOCK_MIN_RCVBUF)
563 sk->sk_rcvbuf = SOCK_MIN_RCVBUF;
564 else
565 sk->sk_rcvbuf = val * 2;
566 break;
567
568 case SO_RCVBUFFORCE:
569 if (!capable(CAP_NET_ADMIN)) {
570 ret = -EPERM;
1da177e4 571 break;
e71a4783
SH		 572 }
573 goto set_rcvbuf;
1da177e4 574
e71a4783 575 case SO_KEEPALIVE:
1da177e4 576#ifdef CONFIG_INET
e71a4783
SH		 577 if (sk->sk_protocol == IPPROTO_TCP)
578 tcp_set_keepalive(sk, valbool);
1da177e4 579#endif
e71a4783
SH		 580 sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool);
581 break;
582
583 case SO_OOBINLINE:
584 sock_valbool_flag(sk, SOCK_URGINLINE, valbool);
585 break;
586
587 case SO_NO_CHECK:
588 sk->sk_no_check = valbool;
589 break;
590
591 case SO_PRIORITY:
592 if ((val >= 0 && val <= 6) || capable(CAP_NET_ADMIN))
593 sk->sk_priority = val;
594 else
595 ret = -EPERM;
596 break;
597
598 case SO_LINGER:
599 if (optlen < sizeof(ling)) {
600 ret = -EINVAL; /* 1003.1g */
1da177e4 601 break;
e71a4783 602 }
2a91525c 603 if (copy_from_user(&ling, optval, sizeof(ling))) {
e71a4783 604 ret = -EFAULT;
1da177e4 605 break;
e71a4783
SH		 606 }
607 if (!ling.l_onoff)
608 sock_reset_flag(sk, SOCK_LINGER);
609 else {
1da177e4 610#if (BITS_PER_LONG == 32)
e71a4783
SH		 611 if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ)
612 sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT;
1da177e4 613 else
e71a4783
SH		 614#endif
615 sk->sk_lingertime = (unsigned int)ling.l_linger * HZ;
616 sock_set_flag(sk, SOCK_LINGER);
617 }
618 break;
619
620 case SO_BSDCOMPAT:
621 sock_warn_obsolete_bsdism("setsockopt");
622 break;
623
624 case SO_PASSCRED:
625 if (valbool)
626 set_bit(SOCK_PASSCRED, &sock->flags);
627 else
628 clear_bit(SOCK_PASSCRED, &sock->flags);
629 break;
630
631 case SO_TIMESTAMP:
92f37fd2 632 case SO_TIMESTAMPNS:
e71a4783 633 if (valbool) {
92f37fd2
ED		 634 if (optname == SO_TIMESTAMP)
635 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
636 else
637 sock_set_flag(sk, SOCK_RCVTSTAMPNS);
e71a4783 638 sock_set_flag(sk, SOCK_RCVTSTAMP);
20d49473 639 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
92f37fd2 640 } else {
e71a4783 641 sock_reset_flag(sk, SOCK_RCVTSTAMP);
92f37fd2
ED		 642 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
643 }
e71a4783
SH		 644 break;
645
20d49473
PO		 646 case SO_TIMESTAMPING:
647 if (val & ~SOF_TIMESTAMPING_MASK) {
f249fb78 648 ret = -EINVAL;
20d49473
PO		 649 break;
650 }
651 sock_valbool_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE,
652 val & SOF_TIMESTAMPING_TX_HARDWARE);
653 sock_valbool_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE,
654 val & SOF_TIMESTAMPING_TX_SOFTWARE);
655 sock_valbool_flag(sk, SOCK_TIMESTAMPING_RX_HARDWARE,
656 val & SOF_TIMESTAMPING_RX_HARDWARE);
657 if (val & SOF_TIMESTAMPING_RX_SOFTWARE)
658 sock_enable_timestamp(sk,
659 SOCK_TIMESTAMPING_RX_SOFTWARE);
660 else
661 sock_disable_timestamp(sk,
662 SOCK_TIMESTAMPING_RX_SOFTWARE);
663 sock_valbool_flag(sk, SOCK_TIMESTAMPING_SOFTWARE,
664 val & SOF_TIMESTAMPING_SOFTWARE);
665 sock_valbool_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE,
666 val & SOF_TIMESTAMPING_SYS_HARDWARE);
667 sock_valbool_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE,
668 val & SOF_TIMESTAMPING_RAW_HARDWARE);
669 break;
670
e71a4783
SH		 671 case SO_RCVLOWAT:
672 if (val < 0)
673 val = INT_MAX;
674 sk->sk_rcvlowat = val ? : 1;
675 break;
676
677 case SO_RCVTIMEO:
678 ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen);
679 break;
680
681 case SO_SNDTIMEO:
682 ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen);
683 break;
1da177e4 684
e71a4783
SH		 685 case SO_ATTACH_FILTER:
686 ret = -EINVAL;
687 if (optlen == sizeof(struct sock_fprog)) {
688 struct sock_fprog fprog;
1da177e4 689
e71a4783
SH		 690 ret = -EFAULT;
691 if (copy_from_user(&fprog, optval, sizeof(fprog)))
1da177e4 692 break;
e71a4783
SH		 693
694 ret = sk_attach_filter(&fprog, sk);
695 }
696 break;
697
698 case SO_DETACH_FILTER:
55b33325 699 ret = sk_detach_filter(sk);
e71a4783 700 break;
1da177e4 701
e71a4783
SH		 702 case SO_PASSSEC:
703 if (valbool)
704 set_bit(SOCK_PASSSEC, &sock->flags);
705 else
706 clear_bit(SOCK_PASSSEC, &sock->flags);
707 break;
4a19ec58
LAT		 708 case SO_MARK:
709 if (!capable(CAP_NET_ADMIN))
710 ret = -EPERM;
2a91525c 711 else
4a19ec58 712 sk->sk_mark = val;
4a19ec58 713 break;
877ce7c1 714
1da177e4
LT		 715 /* We implement the SO_SNDLOWAT etc to
716 not be settable (1003.1g 5.3) */
3b885787
NH		 717 case SO_RXQ_OVFL:
718 if (valbool)
719 sock_set_flag(sk, SOCK_RXQ_OVFL);
720 else
721 sock_reset_flag(sk, SOCK_RXQ_OVFL);
722 break;
e71a4783
SH		 723 default:
724 ret = -ENOPROTOOPT;
725 break;
4ec93edb 726 }
1da177e4
LT		 727 release_sock(sk);
728 return ret;
729}
2a91525c 730EXPORT_SYMBOL(sock_setsockopt);
1da177e4
LT		 731
732
733int sock_getsockopt(struct socket *sock, int level, int optname,
734 char __user *optval, int __user *optlen)
735{
736 struct sock *sk = sock->sk;
4ec93edb 737
e71a4783 738 union {
4ec93edb
YH		 739 int val;
740 struct linger ling;
1da177e4
LT		 741 struct timeval tm;
742 } v;
4ec93edb 743
1da177e4
LT		 744 unsigned int lv = sizeof(int);
745 int len;
4ec93edb 746
e71a4783 747 if (get_user(len, optlen))
4ec93edb 748 return -EFAULT;
e71a4783 749 if (len < 0)
1da177e4 750 return -EINVAL;
4ec93edb 751
50fee1de 752 memset(&v, 0, sizeof(v));
df0bca04 753
2a91525c 754 switch (optname) {
e71a4783
SH		 755 case SO_DEBUG:
756 v.val = sock_flag(sk, SOCK_DBG);
757 break;
758
759 case SO_DONTROUTE:
760 v.val = sock_flag(sk, SOCK_LOCALROUTE);
761 break;
762
763 case SO_BROADCAST:
764 v.val = !!sock_flag(sk, SOCK_BROADCAST);
765 break;
766
767 case SO_SNDBUF:
768 v.val = sk->sk_sndbuf;
769 break;
770
771 case SO_RCVBUF:
772 v.val = sk->sk_rcvbuf;
773 break;
774
775 case SO_REUSEADDR:
776 v.val = sk->sk_reuse;
777 break;
778
779 case SO_KEEPALIVE:
780 v.val = !!sock_flag(sk, SOCK_KEEPOPEN);
781 break;
782
783 case SO_TYPE:
784 v.val = sk->sk_type;
785 break;
786
49c794e9
JE		 787 case SO_PROTOCOL:
788 v.val = sk->sk_protocol;
789 break;
790
0d6038ee
JE		 791 case SO_DOMAIN:
792 v.val = sk->sk_family;
793 break;
794
e71a4783
SH		 795 case SO_ERROR:
796 v.val = -sock_error(sk);
2a91525c 797 if (v.val == 0)
e71a4783
SH		 798 v.val = xchg(&sk->sk_err_soft, 0);
799 break;
800
801 case SO_OOBINLINE:
802 v.val = !!sock_flag(sk, SOCK_URGINLINE);
803 break;
804
805 case SO_NO_CHECK:
806 v.val = sk->sk_no_check;
807 break;
808
809 case SO_PRIORITY:
810 v.val = sk->sk_priority;
811 break;
812
813 case SO_LINGER:
814 lv = sizeof(v.ling);
815 v.ling.l_onoff = !!sock_flag(sk, SOCK_LINGER);
816 v.ling.l_linger = sk->sk_lingertime / HZ;
817 break;
818
819 case SO_BSDCOMPAT:
820 sock_warn_obsolete_bsdism("getsockopt");
821 break;
822
823 case SO_TIMESTAMP:
92f37fd2
ED		 824 v.val = sock_flag(sk, SOCK_RCVTSTAMP) &&
825 !sock_flag(sk, SOCK_RCVTSTAMPNS);
826 break;
827
828 case SO_TIMESTAMPNS:
829 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS);
e71a4783
SH		 830 break;
831
20d49473
PO		 832 case SO_TIMESTAMPING:
833 v.val = 0;
834 if (sock_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE))
835 v.val |= SOF_TIMESTAMPING_TX_HARDWARE;
836 if (sock_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE))
837 v.val |= SOF_TIMESTAMPING_TX_SOFTWARE;
838 if (sock_flag(sk, SOCK_TIMESTAMPING_RX_HARDWARE))
839 v.val |= SOF_TIMESTAMPING_RX_HARDWARE;
840 if (sock_flag(sk, SOCK_TIMESTAMPING_RX_SOFTWARE))
841 v.val |= SOF_TIMESTAMPING_RX_SOFTWARE;
842 if (sock_flag(sk, SOCK_TIMESTAMPING_SOFTWARE))
843 v.val |= SOF_TIMESTAMPING_SOFTWARE;
844 if (sock_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE))
845 v.val |= SOF_TIMESTAMPING_SYS_HARDWARE;
846 if (sock_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE))
847 v.val |= SOF_TIMESTAMPING_RAW_HARDWARE;
848 break;
849
e71a4783 850 case SO_RCVTIMEO:
2a91525c 851 lv = sizeof(struct timeval);
e71a4783
SH		 852 if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) {
853 v.tm.tv_sec = 0;
854 v.tm.tv_usec = 0;
855 } else {
856 v.tm.tv_sec = sk->sk_rcvtimeo / HZ;
857 v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ;
858 }
859 break;
860
861 case SO_SNDTIMEO:
2a91525c 862 lv = sizeof(struct timeval);
e71a4783
SH		 863 if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) {
864 v.tm.tv_sec = 0;
865 v.tm.tv_usec = 0;
866 } else {
867 v.tm.tv_sec = sk->sk_sndtimeo / HZ;
868 v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ;
869 }
870 break;
1da177e4 871
e71a4783
SH		 872 case SO_RCVLOWAT:
873 v.val = sk->sk_rcvlowat;
874 break;
1da177e4 875
e71a4783 876 case SO_SNDLOWAT:
2a91525c 877 v.val = 1;
e71a4783 878 break;
1da177e4 879
e71a4783
SH		 880 case SO_PASSCRED:
881 v.val = test_bit(SOCK_PASSCRED, &sock->flags) ? 1 : 0;
882 break;
1da177e4 883
e71a4783
SH		 884 case SO_PEERCRED:
885 if (len > sizeof(sk->sk_peercred))
886 len = sizeof(sk->sk_peercred);
887 if (copy_to_user(optval, &sk->sk_peercred, len))
888 return -EFAULT;
889 goto lenout;
1da177e4 890
e71a4783
SH		 891 case SO_PEERNAME:
892 {
893 char address[128];
894
895 if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2))
896 return -ENOTCONN;
897 if (lv < len)
898 return -EINVAL;
899 if (copy_to_user(optval, address, len))
900 return -EFAULT;
901 goto lenout;
902 }
1da177e4 903
e71a4783
SH		 904 /* Dubious BSD thing... Probably nobody even uses it, but
905 * the UNIX standard wants it for whatever reason... -DaveM
906 */
907 case SO_ACCEPTCONN:
908 v.val = sk->sk_state == TCP_LISTEN;
909 break;
1da177e4 910
e71a4783
SH		 911 case SO_PASSSEC:
912 v.val = test_bit(SOCK_PASSSEC, &sock->flags) ? 1 : 0;
913 break;
877ce7c1 914
e71a4783
SH		 915 case SO_PEERSEC:
916 return security_socket_getpeersec_stream(sock, optval, optlen, len);
1da177e4 917
4a19ec58
LAT		 918 case SO_MARK:
919 v.val = sk->sk_mark;
920 break;
921
3b885787
NH		 922 case SO_RXQ_OVFL:
923 v.val = !!sock_flag(sk, SOCK_RXQ_OVFL);
924 break;
925
e71a4783
SH		 926 default:
927 return -ENOPROTOOPT;
1da177e4 928 }
e71a4783 929
1da177e4
LT		 930 if (len > lv)
931 len = lv;
932 if (copy_to_user(optval, &v, len))
933 return -EFAULT;
934lenout:
4ec93edb
YH		 935 if (put_user(len, optlen))
936 return -EFAULT;
937 return 0;
1da177e4
LT		 938}
939
a5b5bb9a
IM		 940/*
941 * Initialize an sk_lock.
942 *
943 * (We also register the sk_lock with the lock validator.)
944 */
b6f99a21 945static inline void sock_lock_init(struct sock *sk)
a5b5bb9a 946{
ed07536e
PZ		 947 sock_lock_init_class_and_name(sk,
948 af_family_slock_key_strings[sk->sk_family],
949 af_family_slock_keys + sk->sk_family,
950 af_family_key_strings[sk->sk_family],
951 af_family_keys + sk->sk_family);
a5b5bb9a
IM		 952}
953
4dc6dc71
ED		 954/*
955 * Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet,
956 * even temporarly, because of RCU lookups. sk_node should also be left as is.
957 */
f1a6c4da
PE		 958static void sock_copy(struct sock *nsk, const struct sock *osk)
959{
960#ifdef CONFIG_SECURITY_NETWORK
961 void *sptr = nsk->sk_security;
962#endif
4dc6dc71 963 BUILD_BUG_ON(offsetof(struct sock, sk_copy_start) !=
e022f0b4
KK		 964 sizeof(osk->sk_node) + sizeof(osk->sk_refcnt) +
965 sizeof(osk->sk_tx_queue_mapping));
4dc6dc71
ED		 966 memcpy(&nsk->sk_copy_start, &osk->sk_copy_start,
967 osk->sk_prot->obj_size - offsetof(struct sock, sk_copy_start));
f1a6c4da
PE		 968#ifdef CONFIG_SECURITY_NETWORK
969 nsk->sk_security = sptr;
970 security_sk_clone(osk, nsk);
971#endif
972}
973
2e4afe7b
PE		 974static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority,
975 int family)
c308c1b2
PE		 976{
977 struct sock *sk;
978 struct kmem_cache *slab;
979
980 slab = prot->slab;
e912b114
ED		 981 if (slab != NULL) {
982 sk = kmem_cache_alloc(slab, priority & ~__GFP_ZERO);
983 if (!sk)
984 return sk;
985 if (priority & __GFP_ZERO) {
986 /*
987 * caches using SLAB_DESTROY_BY_RCU should let
988 * sk_node.next un-modified. Special care is taken
989 * when initializing object to zero.
990 */
991 if (offsetof(struct sock, sk_node.next) != 0)
992 memset(sk, 0, offsetof(struct sock, sk_node.next));
993 memset(&sk->sk_node.pprev, 0,
994 prot->obj_size - offsetof(struct sock,
995 sk_node.pprev));
996 }
997 }
c308c1b2
PE		 998 else
999 sk = kmalloc(prot->obj_size, priority);
1000
2e4afe7b 1001 if (sk != NULL) {
a98b65a3
VN		 1002 kmemcheck_annotate_bitfield(sk, flags);
1003
2e4afe7b
PE		 1004 if (security_sk_alloc(sk, family, priority))
1005 goto out_free;
1006
1007 if (!try_module_get(prot->owner))
1008 goto out_free_sec;
e022f0b4 1009 sk_tx_queue_clear(sk);
2e4afe7b
PE		 1010 }
1011
c308c1b2 1012 return sk;
2e4afe7b
PE		 1013
1014out_free_sec:
1015 security_sk_free(sk);
1016out_free:
1017 if (slab != NULL)
1018 kmem_cache_free(slab, sk);
1019 else
1020 kfree(sk);
1021 return NULL;
c308c1b2
PE		 1022}
1023
1024static void sk_prot_free(struct proto *prot, struct sock *sk)
1025{
1026 struct kmem_cache *slab;
2e4afe7b 1027 struct module *owner;
c308c1b2 1028
2e4afe7b 1029 owner = prot->owner;
c308c1b2 1030 slab = prot->slab;
2e4afe7b
PE		 1031
1032 security_sk_free(sk);
c308c1b2
PE		 1033 if (slab != NULL)
1034 kmem_cache_free(slab, sk);
1035 else
1036 kfree(sk);
2e4afe7b 1037 module_put(owner);
c308c1b2
PE		 1038}
1039
1da177e4
LT		 1040/**
1041 * sk_alloc - All socket objects are allocated here
c4ea43c5 1042 * @net: the applicable net namespace
4dc3b16b
PP		 1043 * @family: protocol family
1044 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1045 * @prot: struct proto associated with this new sock instance
1da177e4 1046 */
1b8d7ae4 1047struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
6257ff21 1048 struct proto *prot)
1da177e4 1049{
c308c1b2 1050 struct sock *sk;
1da177e4 1051
154adbc8 1052 sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family);
1da177e4 1053 if (sk) {
154adbc8
PE		 1054 sk->sk_family = family;
1055 /*
1056 * See comment in struct sock definition to understand
1057 * why we need sk_prot_creator -acme
1058 */
1059 sk->sk_prot = sk->sk_prot_creator = prot;
1060 sock_lock_init(sk);
3b1e0a65 1061 sock_net_set(sk, get_net(net));
d66ee058 1062 atomic_set(&sk->sk_wmem_alloc, 1);
1da177e4 1063 }
a79af59e 1064
2e4afe7b 1065 return sk;
1da177e4 1066}
2a91525c 1067EXPORT_SYMBOL(sk_alloc);
1da177e4 1068
2b85a34e 1069static void __sk_free(struct sock *sk)
1da177e4
LT		 1070{
1071 struct sk_filter *filter;
1da177e4
LT		 1072
1073 if (sk->sk_destruct)
1074 sk->sk_destruct(sk);
1075
fda9ef5d 1076 filter = rcu_dereference(sk->sk_filter);
1da177e4 1077 if (filter) {
309dd5fc 1078 sk_filter_uncharge(sk, filter);
fda9ef5d 1079 rcu_assign_pointer(sk->sk_filter, NULL);
1da177e4
LT		 1080 }
1081
20d49473
PO		 1082 sock_disable_timestamp(sk, SOCK_TIMESTAMP);
1083 sock_disable_timestamp(sk, SOCK_TIMESTAMPING_RX_SOFTWARE);
1da177e4
LT		 1084
1085 if (atomic_read(&sk->sk_omem_alloc))
1086 printk(KERN_DEBUG "%s: optmem leakage (%d bytes) detected.\n",
0dc47877 1087 __func__, atomic_read(&sk->sk_omem_alloc));
1da177e4 1088
3b1e0a65 1089 put_net(sock_net(sk));
c308c1b2 1090 sk_prot_free(sk->sk_prot_creator, sk);
1da177e4 1091}
2b85a34e
ED		 1092
1093void sk_free(struct sock *sk)
1094{
1095 /*
1096 * We substract one from sk_wmem_alloc and can know if
1097 * some packets are still in some tx queue.
1098 * If not null, sock_wfree() will call __sk_free(sk) later
1099 */
1100 if (atomic_dec_and_test(&sk->sk_wmem_alloc))
1101 __sk_free(sk);
1102}
2a91525c 1103EXPORT_SYMBOL(sk_free);
1da177e4 1104
edf02087
DL		 1105/*
1106 * Last sock_put should drop referrence to sk->sk_net. It has already
1107 * been dropped in sk_change_net. Taking referrence to stopping namespace
1108 * is not an option.
1109 * Take referrence to a socket to remove it from hash _alive_ and after that
1110 * destroy it in the context of init_net.
1111 */
1112void sk_release_kernel(struct sock *sk)
1113{
1114 if (sk == NULL || sk->sk_socket == NULL)
1115 return;
1116
1117 sock_hold(sk);
1118 sock_release(sk->sk_socket);
65a18ec5 1119 release_net(sock_net(sk));
3b1e0a65 1120 sock_net_set(sk, get_net(&init_net));
edf02087
DL		 1121 sock_put(sk);
1122}
45af1754 1123EXPORT_SYMBOL(sk_release_kernel);
edf02087 1124
dd0fc66f 1125struct sock *sk_clone(const struct sock *sk, const gfp_t priority)
87d11ceb 1126{
8fd1d178 1127 struct sock *newsk;
87d11ceb 1128
8fd1d178 1129 newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family);
87d11ceb
ACM		 1130 if (newsk != NULL) {
1131 struct sk_filter *filter;
1132
892c141e 1133 sock_copy(newsk, sk);
87d11ceb
ACM		 1134
1135 /* SANITY */
3b1e0a65 1136 get_net(sock_net(newsk));
87d11ceb
ACM		 1137 sk_node_init(&newsk->sk_node);
1138 sock_lock_init(newsk);
1139 bh_lock_sock(newsk);
fa438ccf 1140 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL;
87d11ceb
ACM		 1141
1142 atomic_set(&newsk->sk_rmem_alloc, 0);
2b85a34e
ED		 1143 /*
1144 * sk_wmem_alloc set to one (see sk_free() and sock_wfree())
1145 */
1146 atomic_set(&newsk->sk_wmem_alloc, 1);
87d11ceb
ACM		 1147 atomic_set(&newsk->sk_omem_alloc, 0);
1148 skb_queue_head_init(&newsk->sk_receive_queue);
1149 skb_queue_head_init(&newsk->sk_write_queue);
97fc2f08
CL		 1150#ifdef CONFIG_NET_DMA
1151 skb_queue_head_init(&newsk->sk_async_wait_queue);
1152#endif
87d11ceb
ACM		 1153
1154 rwlock_init(&newsk->sk_dst_lock);
1155 rwlock_init(&newsk->sk_callback_lock);
443aef0e
PZ		 1156 lockdep_set_class_and_name(&newsk->sk_callback_lock,
1157 af_callback_keys + newsk->sk_family,
1158 af_family_clock_key_strings[newsk->sk_family]);
87d11ceb
ACM		 1159
1160 newsk->sk_dst_cache = NULL;
1161 newsk->sk_wmem_queued = 0;
1162 newsk->sk_forward_alloc = 0;
1163 newsk->sk_send_head = NULL;
87d11ceb
ACM		 1164 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
1165
1166 sock_reset_flag(newsk, SOCK_DONE);
1167 skb_queue_head_init(&newsk->sk_error_queue);
1168
1169 filter = newsk->sk_filter;
1170 if (filter != NULL)
1171 sk_filter_charge(newsk, filter);
1172
1173 if (unlikely(xfrm_sk_clone_policy(newsk))) {
1174 /* It is still raw copy of parent, so invalidate
1175 * destructor and make plain sk_free() */
1176 newsk->sk_destruct = NULL;
1177 sk_free(newsk);
1178 newsk = NULL;
1179 goto out;
1180 }
1181
1182 newsk->sk_err = 0;
1183 newsk->sk_priority = 0;
4dc6dc71
ED		 1184 /*
1185 * Before updating sk_refcnt, we must commit prior changes to memory
1186 * (Documentation/RCU/rculist_nulls.txt for details)
1187 */
1188 smp_wmb();
87d11ceb
ACM		 1189 atomic_set(&newsk->sk_refcnt, 2);
1190
1191 /*
1192 * Increment the counter in the same struct proto as the master
1193 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
1194 * is the same as sk->sk_prot->socks, as this field was copied
1195 * with memcpy).
1196 *
1197 * This _changes_ the previous behaviour, where
1198 * tcp_create_openreq_child always was incrementing the
1199 * equivalent to tcp_prot->socks (inet_sock_nr), so this have
1200 * to be taken into account in all callers. -acme
1201 */
1202 sk_refcnt_debug_inc(newsk);
972692e0 1203 sk_set_socket(newsk, NULL);
87d11ceb
ACM		 1204 newsk->sk_sleep = NULL;
1205
1206 if (newsk->sk_prot->sockets_allocated)
1748376b 1207 percpu_counter_inc(newsk->sk_prot->sockets_allocated);
704da560
OP		 1208
1209 if (sock_flag(newsk, SOCK_TIMESTAMP) ||
1210 sock_flag(newsk, SOCK_TIMESTAMPING_RX_SOFTWARE))
1211 net_enable_timestamp();
87d11ceb
ACM		 1212 }
1213out:
1214 return newsk;
1215}
87d11ceb
ACM		 1216EXPORT_SYMBOL_GPL(sk_clone);
1217
9958089a
AK		 1218void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
1219{
1220 __sk_dst_set(sk, dst);
1221 sk->sk_route_caps = dst->dev->features;
1222 if (sk->sk_route_caps & NETIF_F_GSO)
4fcd6b99 1223 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE;
9958089a 1224 if (sk_can_gso(sk)) {
82cc1a7a 1225 if (dst->header_len) {
9958089a 1226 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
82cc1a7a 1227 } else {
9958089a 1228 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
82cc1a7a
PWJ		 1229 sk->sk_gso_max_size = dst->dev->gso_max_size;
1230 }
9958089a
AK		 1231 }
1232}
1233EXPORT_SYMBOL_GPL(sk_setup_caps);
1234
1da177e4
LT		 1235void __init sk_init(void)
1236{
4481374c 1237 if (totalram_pages <= 4096) {
1da177e4
LT		 1238 sysctl_wmem_max = 32767;
1239 sysctl_rmem_max = 32767;
1240 sysctl_wmem_default = 32767;
1241 sysctl_rmem_default = 32767;
4481374c 1242 } else if (totalram_pages >= 131072) {
1da177e4
LT		 1243 sysctl_wmem_max = 131071;
1244 sysctl_rmem_max = 131071;
1245 }
1246}
1247
1248/*
1249 * Simple resource managers for sockets.
1250 */
1251
1252
4ec93edb
YH		 1253/*
1254 * Write buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1255 */
1256void sock_wfree(struct sk_buff *skb)
1257{
1258 struct sock *sk = skb->sk;
d99927f4 1259 unsigned int len = skb->truesize;
1da177e4 1260
d99927f4
ED		 1261 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) {
1262 /*
1263 * Keep a reference on sk_wmem_alloc, this will be released
1264 * after sk_write_space() call
1265 */
1266 atomic_sub(len - 1, &sk->sk_wmem_alloc);
1da177e4 1267 sk->sk_write_space(sk);
d99927f4
ED		 1268 len = 1;
1269 }
2b85a34e 1270 /*
d99927f4
ED		 1271 * if sk_wmem_alloc reaches 0, we must finish what sk_free()
1272 * could not do because of in-flight packets
2b85a34e 1273 */
d99927f4 1274 if (atomic_sub_and_test(len, &sk->sk_wmem_alloc))
2b85a34e 1275 __sk_free(sk);
1da177e4 1276}
2a91525c 1277EXPORT_SYMBOL(sock_wfree);
1da177e4 1278
4ec93edb
YH		 1279/*
1280 * Read buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1281 */
1282void sock_rfree(struct sk_buff *skb)
1283{
1284 struct sock *sk = skb->sk;
1285
1286 atomic_sub(skb->truesize, &sk->sk_rmem_alloc);
3ab224be 1287 sk_mem_uncharge(skb->sk, skb->truesize);
1da177e4 1288}
2a91525c 1289EXPORT_SYMBOL(sock_rfree);
1da177e4
LT		 1290
1291
1292int sock_i_uid(struct sock *sk)
1293{
1294 int uid;
1295
1296 read_lock(&sk->sk_callback_lock);
1297 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : 0;
1298 read_unlock(&sk->sk_callback_lock);
1299 return uid;
1300}
2a91525c 1301EXPORT_SYMBOL(sock_i_uid);
1da177e4
LT		 1302
1303unsigned long sock_i_ino(struct sock *sk)
1304{
1305 unsigned long ino;
1306
1307 read_lock(&sk->sk_callback_lock);
1308 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
1309 read_unlock(&sk->sk_callback_lock);
1310 return ino;
1311}
2a91525c 1312EXPORT_SYMBOL(sock_i_ino);
1da177e4
LT		 1313
1314/*
1315 * Allocate a skb from the socket's send buffer.
1316 */
86a76caf 1317struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
dd0fc66f 1318 gfp_t priority)
1da177e4
LT		 1319{
1320 if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
2a91525c 1321 struct sk_buff *skb = alloc_skb(size, priority);
1da177e4
LT		 1322 if (skb) {
1323 skb_set_owner_w(skb, sk);
1324 return skb;
1325 }
1326 }
1327 return NULL;
1328}
2a91525c 1329EXPORT_SYMBOL(sock_wmalloc);
1da177e4
LT		 1330
1331/*
1332 * Allocate a skb from the socket's receive buffer.
4ec93edb 1333 */
86a76caf 1334struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force,
dd0fc66f 1335 gfp_t priority)
1da177e4
LT		 1336{
1337 if (force || atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) {
1338 struct sk_buff *skb = alloc_skb(size, priority);
1339 if (skb) {
1340 skb_set_owner_r(skb, sk);
1341 return skb;
1342 }
1343 }
1344 return NULL;
1345}
1346
4ec93edb 1347/*
1da177e4 1348 * Allocate a memory block from the socket's option memory buffer.
4ec93edb 1349 */
dd0fc66f 1350void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
1da177e4
LT		 1351{
1352 if ((unsigned)size <= sysctl_optmem_max &&
1353 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) {
1354 void *mem;
1355 /* First do the add, to avoid the race if kmalloc
4ec93edb 1356 * might sleep.
1da177e4
LT		 1357 */
1358 atomic_add(size, &sk->sk_omem_alloc);
1359 mem = kmalloc(size, priority);
1360 if (mem)
1361 return mem;
1362 atomic_sub(size, &sk->sk_omem_alloc);
1363 }
1364 return NULL;
1365}
2a91525c 1366EXPORT_SYMBOL(sock_kmalloc);
1da177e4
LT		 1367
1368/*
1369 * Free an option memory block.
1370 */
1371void sock_kfree_s(struct sock *sk, void *mem, int size)
1372{
1373 kfree(mem);
1374 atomic_sub(size, &sk->sk_omem_alloc);
1375}
2a91525c 1376EXPORT_SYMBOL(sock_kfree_s);
1da177e4
LT		 1377
1378/* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
1379 I think, these locks should be removed for datagram sockets.
1380 */
2a91525c 1381static long sock_wait_for_wmem(struct sock *sk, long timeo)
1da177e4
LT		 1382{
1383 DEFINE_WAIT(wait);
1384
1385 clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1386 for (;;) {
1387 if (!timeo)
1388 break;
1389 if (signal_pending(current))
1390 break;
1391 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1392 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
1393 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf)
1394 break;
1395 if (sk->sk_shutdown & SEND_SHUTDOWN)
1396 break;
1397 if (sk->sk_err)
1398 break;
1399 timeo = schedule_timeout(timeo);
1400 }
1401 finish_wait(sk->sk_sleep, &wait);
1402 return timeo;
1403}
1404
1405
1406/*
1407 * Generic send/receive buffer handlers
1408 */
1409
4cc7f68d
HX		 1410struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len,
1411 unsigned long data_len, int noblock,
1412 int *errcode)
1da177e4
LT		 1413{
1414 struct sk_buff *skb;
7d877f3b 1415 gfp_t gfp_mask;
1da177e4
LT		 1416 long timeo;
1417 int err;
1418
1419 gfp_mask = sk->sk_allocation;
1420 if (gfp_mask & __GFP_WAIT)
1421 gfp_mask |= __GFP_REPEAT;
1422
1423 timeo = sock_sndtimeo(sk, noblock);
1424 while (1) {
1425 err = sock_error(sk);
1426 if (err != 0)
1427 goto failure;
1428
1429 err = -EPIPE;
1430 if (sk->sk_shutdown & SEND_SHUTDOWN)
1431 goto failure;
1432
1433 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
db38c179 1434 skb = alloc_skb(header_len, gfp_mask);
1da177e4
LT		 1435 if (skb) {
1436 int npages;
1437 int i;
1438
1439 /* No pages, we're done... */
1440 if (!data_len)
1441 break;
1442
1443 npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
1444 skb->truesize += data_len;
1445 skb_shinfo(skb)->nr_frags = npages;
1446 for (i = 0; i < npages; i++) {
1447 struct page *page;
1448 skb_frag_t *frag;
1449
1450 page = alloc_pages(sk->sk_allocation, 0);
1451 if (!page) {
1452 err = -ENOBUFS;
1453 skb_shinfo(skb)->nr_frags = i;
1454 kfree_skb(skb);
1455 goto failure;
1456 }
1457
1458 frag = &skb_shinfo(skb)->frags[i];
1459 frag->page = page;
1460 frag->page_offset = 0;
1461 frag->size = (data_len >= PAGE_SIZE ?
1462 PAGE_SIZE :
1463 data_len);
1464 data_len -= PAGE_SIZE;
1465 }
1466
1467 /* Full success... */
1468 break;
1469 }
1470 err = -ENOBUFS;
1471 goto failure;
1472 }
1473 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1474 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1475 err = -EAGAIN;
1476 if (!timeo)
1477 goto failure;
1478 if (signal_pending(current))
1479 goto interrupted;
1480 timeo = sock_wait_for_wmem(sk, timeo);
1481 }
1482
1483 skb_set_owner_w(skb, sk);
1484 return skb;
1485
1486interrupted:
1487 err = sock_intr_errno(timeo);
1488failure:
1489 *errcode = err;
1490 return NULL;
1491}
4cc7f68d 1492EXPORT_SYMBOL(sock_alloc_send_pskb);
1da177e4 1493
4ec93edb 1494struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
1da177e4
LT		 1495 int noblock, int *errcode)
1496{
1497 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode);
1498}
2a91525c 1499EXPORT_SYMBOL(sock_alloc_send_skb);
1da177e4
LT		 1500
1501static void __lock_sock(struct sock *sk)
1502{
1503 DEFINE_WAIT(wait);
1504
e71a4783 1505 for (;;) {
1da177e4
LT		 1506 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
1507 TASK_UNINTERRUPTIBLE);
1508 spin_unlock_bh(&sk->sk_lock.slock);
1509 schedule();
1510 spin_lock_bh(&sk->sk_lock.slock);
e71a4783 1511 if (!sock_owned_by_user(sk))
1da177e4
LT		 1512 break;
1513 }
1514 finish_wait(&sk->sk_lock.wq, &wait);
1515}
1516
1517static void __release_sock(struct sock *sk)
1518{
1519 struct sk_buff *skb = sk->sk_backlog.head;
1520
1521 do {
1522 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
1523 bh_unlock_sock(sk);
1524
1525 do {
1526 struct sk_buff *next = skb->next;
1527
1528 skb->next = NULL;
c57943a1 1529 sk_backlog_rcv(sk, skb);
1da177e4
LT		 1530
1531 /*
1532 * We are in process context here with softirqs
1533 * disabled, use cond_resched_softirq() to preempt.
1534 * This is safe to do because we've taken the backlog
1535 * queue private:
1536 */
1537 cond_resched_softirq();
1538
1539 skb = next;
1540 } while (skb != NULL);
1541
1542 bh_lock_sock(sk);
e71a4783 1543 } while ((skb = sk->sk_backlog.head) != NULL);
1da177e4
LT		 1544}
1545
1546/**
1547 * sk_wait_data - wait for data to arrive at sk_receive_queue
4dc3b16b
PP		 1548 * @sk: sock to wait on
1549 * @timeo: for how long
1da177e4
LT		 1550 *
1551 * Now socket state including sk->sk_err is changed only under lock,
1552 * hence we may omit checks after joining wait queue.
1553 * We check receive queue before schedule() only as optimization;
1554 * it is very likely that release_sock() added new data.
1555 */
1556int sk_wait_data(struct sock *sk, long *timeo)
1557{
1558 int rc;
1559 DEFINE_WAIT(wait);
1560
1561 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
1562 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1563 rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue));
1564 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1565 finish_wait(sk->sk_sleep, &wait);
1566 return rc;
1567}
1da177e4
LT		 1568EXPORT_SYMBOL(sk_wait_data);
1569
3ab224be
HA		 1570/**
1571 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated
1572 * @sk: socket
1573 * @size: memory size to allocate
1574 * @kind: allocation type
1575 *
1576 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means
1577 * rmem allocation. This function assumes that protocols which have
1578 * memory_pressure use sk_wmem_queued as write buffer accounting.
1579 */
1580int __sk_mem_schedule(struct sock *sk, int size, int kind)
1581{
1582 struct proto *prot = sk->sk_prot;
1583 int amt = sk_mem_pages(size);
1584 int allocated;
1585
1586 sk->sk_forward_alloc += amt * SK_MEM_QUANTUM;
1587 allocated = atomic_add_return(amt, prot->memory_allocated);
1588
1589 /* Under limit. */
1590 if (allocated <= prot->sysctl_mem[0]) {
1591 if (prot->memory_pressure && *prot->memory_pressure)
1592 *prot->memory_pressure = 0;
1593 return 1;
1594 }
1595
1596 /* Under pressure. */
1597 if (allocated > prot->sysctl_mem[1])
1598 if (prot->enter_memory_pressure)
5c52ba17 1599 prot->enter_memory_pressure(sk);
3ab224be
HA		 1600
1601 /* Over hard limit. */
1602 if (allocated > prot->sysctl_mem[2])
1603 goto suppress_allocation;
1604
1605 /* guarantee minimum buffer size under pressure */
1606 if (kind == SK_MEM_RECV) {
1607 if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0])
1608 return 1;
1609 } else { /* SK_MEM_SEND */
1610 if (sk->sk_type == SOCK_STREAM) {
1611 if (sk->sk_wmem_queued < prot->sysctl_wmem[0])
1612 return 1;
1613 } else if (atomic_read(&sk->sk_wmem_alloc) <
1614 prot->sysctl_wmem[0])
1615 return 1;
1616 }
1617
1618 if (prot->memory_pressure) {
1748376b
ED		 1619 int alloc;
1620
1621 if (!*prot->memory_pressure)
1622 return 1;
1623 alloc = percpu_counter_read_positive(prot->sockets_allocated);
1624 if (prot->sysctl_mem[2] > alloc *
3ab224be
HA		 1625 sk_mem_pages(sk->sk_wmem_queued +
1626 atomic_read(&sk->sk_rmem_alloc) +
1627 sk->sk_forward_alloc))
1628 return 1;
1629 }
1630
1631suppress_allocation:
1632
1633 if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) {
1634 sk_stream_moderate_sndbuf(sk);
1635
1636 /* Fail only if socket is _under_ its sndbuf.
1637 * In this case we cannot block, so that we have to fail.
1638 */
1639 if (sk->sk_wmem_queued + size >= sk->sk_sndbuf)
1640 return 1;
1641 }
1642
1643 /* Alas. Undo changes. */
1644 sk->sk_forward_alloc -= amt * SK_MEM_QUANTUM;
1645 atomic_sub(amt, prot->memory_allocated);
1646 return 0;
1647}
3ab224be
HA		 1648EXPORT_SYMBOL(__sk_mem_schedule);
1649
1650/**
1651 * __sk_reclaim - reclaim memory_allocated
1652 * @sk: socket
1653 */
1654void __sk_mem_reclaim(struct sock *sk)
1655{
1656 struct proto *prot = sk->sk_prot;
1657
680a5a50 1658 atomic_sub(sk->sk_forward_alloc >> SK_MEM_QUANTUM_SHIFT,
3ab224be
HA		 1659 prot->memory_allocated);
1660 sk->sk_forward_alloc &= SK_MEM_QUANTUM - 1;
1661
1662 if (prot->memory_pressure && *prot->memory_pressure &&
1663 (atomic_read(prot->memory_allocated) < prot->sysctl_mem[0]))
1664 *prot->memory_pressure = 0;
1665}
3ab224be
HA		 1666EXPORT_SYMBOL(__sk_mem_reclaim);
1667
1668
1da177e4
LT		 1669/*
1670 * Set of default routines for initialising struct proto_ops when
1671 * the protocol does not support a particular function. In certain
1672 * cases where it makes no sense for a protocol to have a "do nothing"
1673 * function, some default processing is provided.
1674 */
1675
1676int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
1677{
1678 return -EOPNOTSUPP;
1679}
2a91525c 1680EXPORT_SYMBOL(sock_no_bind);
1da177e4 1681
4ec93edb 1682int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 1683 int len, int flags)
1684{
1685 return -EOPNOTSUPP;
1686}
2a91525c 1687EXPORT_SYMBOL(sock_no_connect);
1da177e4
LT		 1688
1689int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
1690{
1691 return -EOPNOTSUPP;
1692}
2a91525c 1693EXPORT_SYMBOL(sock_no_socketpair);
1da177e4
LT		 1694
1695int sock_no_accept(struct socket *sock, struct socket *newsock, int flags)
1696{
1697 return -EOPNOTSUPP;
1698}
2a91525c 1699EXPORT_SYMBOL(sock_no_accept);
1da177e4 1700
4ec93edb 1701int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 1702 int *len, int peer)
1703{
1704 return -EOPNOTSUPP;
1705}
2a91525c 1706EXPORT_SYMBOL(sock_no_getname);
1da177e4 1707
2a91525c 1708unsigned int sock_no_poll(struct file *file, struct socket *sock, poll_table *pt)
1da177e4
LT		 1709{
1710 return 0;
1711}
2a91525c 1712EXPORT_SYMBOL(sock_no_poll);
1da177e4
LT		 1713
1714int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1715{
1716 return -EOPNOTSUPP;
1717}
2a91525c 1718EXPORT_SYMBOL(sock_no_ioctl);
1da177e4
LT		 1719
1720int sock_no_listen(struct socket *sock, int backlog)
1721{
1722 return -EOPNOTSUPP;
1723}
2a91525c 1724EXPORT_SYMBOL(sock_no_listen);
1da177e4
LT		 1725
1726int sock_no_shutdown(struct socket *sock, int how)
1727{
1728 return -EOPNOTSUPP;
1729}
2a91525c 1730EXPORT_SYMBOL(sock_no_shutdown);
1da177e4
LT		 1731
1732int sock_no_setsockopt(struct socket *sock, int level, int optname,
b7058842 1733 char __user *optval, unsigned int optlen)
1da177e4
LT		 1734{
1735 return -EOPNOTSUPP;
1736}
2a91525c 1737EXPORT_SYMBOL(sock_no_setsockopt);
1da177e4
LT		 1738
1739int sock_no_getsockopt(struct socket *sock, int level, int optname,
1740 char __user *optval, int __user *optlen)
1741{
1742 return -EOPNOTSUPP;
1743}
2a91525c 1744EXPORT_SYMBOL(sock_no_getsockopt);
1da177e4
LT		 1745
1746int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
1747 size_t len)
1748{
1749 return -EOPNOTSUPP;
1750}
2a91525c 1751EXPORT_SYMBOL(sock_no_sendmsg);
1da177e4
LT		 1752
1753int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
1754 size_t len, int flags)
1755{
1756 return -EOPNOTSUPP;
1757}
2a91525c 1758EXPORT_SYMBOL(sock_no_recvmsg);
1da177e4
LT		 1759
1760int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
1761{
1762 /* Mirror missing mmap method error code */
1763 return -ENODEV;
1764}
2a91525c 1765EXPORT_SYMBOL(sock_no_mmap);
1da177e4
LT		 1766
1767ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
1768{
1769 ssize_t res;
1770 struct msghdr msg = {.msg_flags = flags};
1771 struct kvec iov;
1772 char *kaddr = kmap(page);
1773 iov.iov_base = kaddr + offset;
1774 iov.iov_len = size;
1775 res = kernel_sendmsg(sock, &msg, &iov, 1, size);
1776 kunmap(page);
1777 return res;
1778}
2a91525c 1779EXPORT_SYMBOL(sock_no_sendpage);
1da177e4
LT		 1780
1781/*
1782 * Default Socket Callbacks
1783 */
1784
1785static void sock_def_wakeup(struct sock *sk)
1786{
1787 read_lock(&sk->sk_callback_lock);
a57de0b4 1788 if (sk_has_sleeper(sk))
1da177e4
LT		 1789 wake_up_interruptible_all(sk->sk_sleep);
1790 read_unlock(&sk->sk_callback_lock);
1791}
1792
1793static void sock_def_error_report(struct sock *sk)
1794{
1795 read_lock(&sk->sk_callback_lock);
a57de0b4 1796 if (sk_has_sleeper(sk))
37e5540b 1797 wake_up_interruptible_poll(sk->sk_sleep, POLLERR);
8d8ad9d7 1798 sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR);
1da177e4
LT		 1799 read_unlock(&sk->sk_callback_lock);
1800}
1801
1802static void sock_def_readable(struct sock *sk, int len)
1803{
1804 read_lock(&sk->sk_callback_lock);
a57de0b4 1805 if (sk_has_sleeper(sk))
37e5540b
DL		 1806 wake_up_interruptible_sync_poll(sk->sk_sleep, POLLIN |
1807 POLLRDNORM | POLLRDBAND);
8d8ad9d7 1808 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
1da177e4
LT		 1809 read_unlock(&sk->sk_callback_lock);
1810}
1811
1812static void sock_def_write_space(struct sock *sk)
1813{
1814 read_lock(&sk->sk_callback_lock);
1815
1816 /* Do not wake up a writer until he can make "significant"
1817 * progress. --DaveM
1818 */
e71a4783 1819 if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) {
a57de0b4 1820 if (sk_has_sleeper(sk))
37e5540b
DL		 1821 wake_up_interruptible_sync_poll(sk->sk_sleep, POLLOUT |
1822 POLLWRNORM | POLLWRBAND);
1da177e4
LT		 1823
1824 /* Should agree with poll, otherwise some programs break */
1825 if (sock_writeable(sk))
8d8ad9d7 1826 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
1da177e4
LT		 1827 }
1828
1829 read_unlock(&sk->sk_callback_lock);
1830}
1831
1832static void sock_def_destruct(struct sock *sk)
1833{
a51482bd 1834 kfree(sk->sk_protinfo);
1da177e4
LT		 1835}
1836
1837void sk_send_sigurg(struct sock *sk)
1838{
1839 if (sk->sk_socket && sk->sk_socket->file)
1840 if (send_sigurg(&sk->sk_socket->file->f_owner))
8d8ad9d7 1841 sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI);
1da177e4 1842}
2a91525c 1843EXPORT_SYMBOL(sk_send_sigurg);
1da177e4
LT		 1844
1845void sk_reset_timer(struct sock *sk, struct timer_list* timer,
1846 unsigned long expires)
1847{
1848 if (!mod_timer(timer, expires))
1849 sock_hold(sk);
1850}
1da177e4
LT		 1851EXPORT_SYMBOL(sk_reset_timer);
1852
1853void sk_stop_timer(struct sock *sk, struct timer_list* timer)
1854{
1855 if (timer_pending(timer) && del_timer(timer))
1856 __sock_put(sk);
1857}
1da177e4
LT		 1858EXPORT_SYMBOL(sk_stop_timer);
1859
1860void sock_init_data(struct socket *sock, struct sock *sk)
1861{
1862 skb_queue_head_init(&sk->sk_receive_queue);
1863 skb_queue_head_init(&sk->sk_write_queue);
1864 skb_queue_head_init(&sk->sk_error_queue);
97fc2f08
CL		 1865#ifdef CONFIG_NET_DMA
1866 skb_queue_head_init(&sk->sk_async_wait_queue);
1867#endif
1da177e4
LT		 1868
1869 sk->sk_send_head = NULL;
1870
1871 init_timer(&sk->sk_timer);
4ec93edb 1872
1da177e4
LT		 1873 sk->sk_allocation = GFP_KERNEL;
1874 sk->sk_rcvbuf = sysctl_rmem_default;
1875 sk->sk_sndbuf = sysctl_wmem_default;
1876 sk->sk_state = TCP_CLOSE;
972692e0 1877 sk_set_socket(sk, sock);
1da177e4
LT		 1878
1879 sock_set_flag(sk, SOCK_ZAPPED);
1880
e71a4783 1881 if (sock) {
1da177e4
LT		 1882 sk->sk_type = sock->type;
1883 sk->sk_sleep = &sock->wait;
1884 sock->sk = sk;
1885 } else
1886 sk->sk_sleep = NULL;
1887
1888 rwlock_init(&sk->sk_dst_lock);
1889 rwlock_init(&sk->sk_callback_lock);
443aef0e
PZ		 1890 lockdep_set_class_and_name(&sk->sk_callback_lock,
1891 af_callback_keys + sk->sk_family,
1892 af_family_clock_key_strings[sk->sk_family]);
1da177e4
LT		 1893
1894 sk->sk_state_change = sock_def_wakeup;
1895 sk->sk_data_ready = sock_def_readable;
1896 sk->sk_write_space = sock_def_write_space;
1897 sk->sk_error_report = sock_def_error_report;
1898 sk->sk_destruct = sock_def_destruct;
1899
1900 sk->sk_sndmsg_page = NULL;
1901 sk->sk_sndmsg_off = 0;
1902
1903 sk->sk_peercred.pid = 0;
1904 sk->sk_peercred.uid = -1;
1905 sk->sk_peercred.gid = -1;
1906 sk->sk_write_pending = 0;
1907 sk->sk_rcvlowat = 1;
1908 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
1909 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
1910
f37f0afb 1911 sk->sk_stamp = ktime_set(-1L, 0);
1da177e4 1912
4dc6dc71
ED		 1913 /*
1914 * Before updating sk_refcnt, we must commit prior changes to memory
1915 * (Documentation/RCU/rculist_nulls.txt for details)
1916 */
1917 smp_wmb();
1da177e4 1918 atomic_set(&sk->sk_refcnt, 1);
33c732c3 1919 atomic_set(&sk->sk_drops, 0);
1da177e4 1920}
2a91525c 1921EXPORT_SYMBOL(sock_init_data);
1da177e4 1922
b5606c2d 1923void lock_sock_nested(struct sock *sk, int subclass)
1da177e4
LT		 1924{
1925 might_sleep();
a5b5bb9a 1926 spin_lock_bh(&sk->sk_lock.slock);
d2e9117c 1927 if (sk->sk_lock.owned)
1da177e4 1928 __lock_sock(sk);
d2e9117c 1929 sk->sk_lock.owned = 1;
a5b5bb9a
IM		 1930 spin_unlock(&sk->sk_lock.slock);
1931 /*
1932 * The sk_lock has mutex_lock() semantics here:
1933 */
fcc70d5f 1934 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
a5b5bb9a 1935 local_bh_enable();
1da177e4 1936}
fcc70d5f 1937EXPORT_SYMBOL(lock_sock_nested);
1da177e4 1938
b5606c2d 1939void release_sock(struct sock *sk)
1da177e4 1940{
a5b5bb9a
IM		 1941 /*
1942 * The sk_lock has mutex_unlock() semantics:
1943 */
1944 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
1945
1946 spin_lock_bh(&sk->sk_lock.slock);
1da177e4
LT		 1947 if (sk->sk_backlog.tail)
1948 __release_sock(sk);
d2e9117c 1949 sk->sk_lock.owned = 0;
a5b5bb9a
IM		 1950 if (waitqueue_active(&sk->sk_lock.wq))
1951 wake_up(&sk->sk_lock.wq);
1952 spin_unlock_bh(&sk->sk_lock.slock);
1da177e4
LT		 1953}
1954EXPORT_SYMBOL(release_sock);
1955
1956int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
4ec93edb 1957{
b7aa0bf7 1958 struct timeval tv;
1da177e4 1959 if (!sock_flag(sk, SOCK_TIMESTAMP))
20d49473 1960 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
b7aa0bf7
ED		 1961 tv = ktime_to_timeval(sk->sk_stamp);
1962 if (tv.tv_sec == -1)
1da177e4 1963 return -ENOENT;
b7aa0bf7
ED		 1964 if (tv.tv_sec == 0) {
1965 sk->sk_stamp = ktime_get_real();
1966 tv = ktime_to_timeval(sk->sk_stamp);
1967 }
1968 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0;
4ec93edb 1969}
1da177e4
LT		 1970EXPORT_SYMBOL(sock_get_timestamp);
1971
ae40eb1e
ED		 1972int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
1973{
1974 struct timespec ts;
1975 if (!sock_flag(sk, SOCK_TIMESTAMP))
20d49473 1976 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
ae40eb1e
ED		 1977 ts = ktime_to_timespec(sk->sk_stamp);
1978 if (ts.tv_sec == -1)
1979 return -ENOENT;
1980 if (ts.tv_sec == 0) {
1981 sk->sk_stamp = ktime_get_real();
1982 ts = ktime_to_timespec(sk->sk_stamp);
1983 }
1984 return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0;
1985}
1986EXPORT_SYMBOL(sock_get_timestampns);
1987
20d49473 1988void sock_enable_timestamp(struct sock *sk, int flag)
4ec93edb 1989{
20d49473
PO		 1990 if (!sock_flag(sk, flag)) {
1991 sock_set_flag(sk, flag);
1992 /*
1993 * we just set one of the two flags which require net
1994 * time stamping, but time stamping might have been on
1995 * already because of the other one
1996 */
1997 if (!sock_flag(sk,
1998 flag == SOCK_TIMESTAMP ?
1999 SOCK_TIMESTAMPING_RX_SOFTWARE :
2000 SOCK_TIMESTAMP))
2001 net_enable_timestamp();
1da177e4
LT		 2002 }
2003}
1da177e4
LT		 2004
2005/*
2006 * Get a socket option on an socket.
2007 *
2008 * FIX: POSIX 1003.1g is very ambiguous here. It states that
2009 * asynchronous errors should be reported by getsockopt. We assume
2010 * this means if you specify SO_ERROR (otherwise whats the point of it).
2011 */
2012int sock_common_getsockopt(struct socket *sock, int level, int optname,
2013 char __user *optval, int __user *optlen)
2014{
2015 struct sock *sk = sock->sk;
2016
2017 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2018}
1da177e4
LT		 2019EXPORT_SYMBOL(sock_common_getsockopt);
2020
3fdadf7d 2021#ifdef CONFIG_COMPAT
543d9cfe
ACM		 2022int compat_sock_common_getsockopt(struct socket *sock, int level, int optname,
2023 char __user *optval, int __user *optlen)
3fdadf7d
DM		 2024{
2025 struct sock *sk = sock->sk;
2026
1e51f951 2027 if (sk->sk_prot->compat_getsockopt != NULL)
543d9cfe
ACM		 2028 return sk->sk_prot->compat_getsockopt(sk, level, optname,
2029 optval, optlen);
3fdadf7d
DM		 2030 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2031}
2032EXPORT_SYMBOL(compat_sock_common_getsockopt);
2033#endif
2034
1da177e4
LT		 2035int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock,
2036 struct msghdr *msg, size_t size, int flags)
2037{
2038 struct sock *sk = sock->sk;
2039 int addr_len = 0;
2040 int err;
2041
2042 err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT,
2043 flags & ~MSG_DONTWAIT, &addr_len);
2044 if (err >= 0)
2045 msg->msg_namelen = addr_len;
2046 return err;
2047}
1da177e4
LT		 2048EXPORT_SYMBOL(sock_common_recvmsg);
2049
2050/*
2051 * Set socket options on an inet socket.
2052 */
2053int sock_common_setsockopt(struct socket *sock, int level, int optname,
b7058842 2054 char __user *optval, unsigned int optlen)
1da177e4
LT		 2055{
2056 struct sock *sk = sock->sk;
2057
2058 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2059}
1da177e4
LT		 2060EXPORT_SYMBOL(sock_common_setsockopt);
2061
3fdadf7d 2062#ifdef CONFIG_COMPAT
543d9cfe 2063int compat_sock_common_setsockopt(struct socket *sock, int level, int optname,
b7058842 2064 char __user *optval, unsigned int optlen)
3fdadf7d
DM		 2065{
2066 struct sock *sk = sock->sk;
2067
543d9cfe
ACM		 2068 if (sk->sk_prot->compat_setsockopt != NULL)
2069 return sk->sk_prot->compat_setsockopt(sk, level, optname,
2070 optval, optlen);
3fdadf7d
DM		 2071 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2072}
2073EXPORT_SYMBOL(compat_sock_common_setsockopt);
2074#endif
2075
1da177e4
LT		 2076void sk_common_release(struct sock *sk)
2077{
2078 if (sk->sk_prot->destroy)
2079 sk->sk_prot->destroy(sk);
2080
2081 /*
2082 * Observation: when sock_common_release is called, processes have
2083 * no access to socket. But net still has.
2084 * Step one, detach it from networking:
2085 *
2086 * A. Remove from hash tables.
2087 */
2088
2089 sk->sk_prot->unhash(sk);
2090
2091 /*
2092 * In this point socket cannot receive new packets, but it is possible
2093 * that some packets are in flight because some CPU runs receiver and
2094 * did hash table lookup before we unhashed socket. They will achieve
2095 * receive queue and will be purged by socket destructor.
2096 *
2097 * Also we still have packets pending on receive queue and probably,
2098 * our own packets waiting in device queues. sock_destroy will drain
2099 * receive queue, but transmitted packets will delay socket destruction
2100 * until the last reference will be released.
2101 */
2102
2103 sock_orphan(sk);
2104
2105 xfrm_sk_free_policy(sk);
2106
e6848976 2107 sk_refcnt_debug_release(sk);
1da177e4
LT		 2108 sock_put(sk);
2109}
1da177e4
LT		 2110EXPORT_SYMBOL(sk_common_release);
2111
2112static DEFINE_RWLOCK(proto_list_lock);
2113static LIST_HEAD(proto_list);
2114
13ff3d6f
PE		 2115#ifdef CONFIG_PROC_FS
2116#define PROTO_INUSE_NR 64 /* should be enough for the first time */
1338d466
PE		 2117struct prot_inuse {
2118 int val[PROTO_INUSE_NR];
2119};
13ff3d6f
PE		 2120
2121static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR);
70ee1159
PE		 2122
2123#ifdef CONFIG_NET_NS
2124void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
2125{
2126 int cpu = smp_processor_id();
2127 per_cpu_ptr(net->core.inuse, cpu)->val[prot->inuse_idx] += val;
2128}
2129EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2130
2131int sock_prot_inuse_get(struct net *net, struct proto *prot)
2132{
2133 int cpu, idx = prot->inuse_idx;
2134 int res = 0;
2135
2136 for_each_possible_cpu(cpu)
2137 res += per_cpu_ptr(net->core.inuse, cpu)->val[idx];
2138
2139 return res >= 0 ? res : 0;
2140}
2141EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
2142
2143static int sock_inuse_init_net(struct net *net)
2144{
2145 net->core.inuse = alloc_percpu(struct prot_inuse);
2146 return net->core.inuse ? 0 : -ENOMEM;
2147}
2148
2149static void sock_inuse_exit_net(struct net *net)
2150{
2151 free_percpu(net->core.inuse);
2152}
2153
2154static struct pernet_operations net_inuse_ops = {
2155 .init = sock_inuse_init_net,
2156 .exit = sock_inuse_exit_net,
2157};
2158
2159static __init int net_inuse_init(void)
2160{
2161 if (register_pernet_subsys(&net_inuse_ops))
2162 panic("Cannot initialize net inuse counters");
2163
2164 return 0;
2165}
2166
2167core_initcall(net_inuse_init);
2168#else
1338d466
PE		 2169static DEFINE_PER_CPU(struct prot_inuse, prot_inuse);
2170
c29a0bc4 2171void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
1338d466
PE		 2172{
2173 __get_cpu_var(prot_inuse).val[prot->inuse_idx] += val;
2174}
2175EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2176
c29a0bc4 2177int sock_prot_inuse_get(struct net *net, struct proto *prot)
1338d466
PE		 2178{
2179 int cpu, idx = prot->inuse_idx;
2180 int res = 0;
2181
2182 for_each_possible_cpu(cpu)
2183 res += per_cpu(prot_inuse, cpu).val[idx];
2184
2185 return res >= 0 ? res : 0;
2186}
2187EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
70ee1159 2188#endif
13ff3d6f
PE		 2189
2190static void assign_proto_idx(struct proto *prot)
2191{
2192 prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR);
2193
2194 if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) {
2195 printk(KERN_ERR "PROTO_INUSE_NR exhausted\n");
2196 return;
2197 }
2198
2199 set_bit(prot->inuse_idx, proto_inuse_idx);
2200}
2201
2202static void release_proto_idx(struct proto *prot)
2203{
2204 if (prot->inuse_idx != PROTO_INUSE_NR - 1)
2205 clear_bit(prot->inuse_idx, proto_inuse_idx);
2206}
2207#else
2208static inline void assign_proto_idx(struct proto *prot)
2209{
2210}
2211
2212static inline void release_proto_idx(struct proto *prot)
2213{
2214}
2215#endif
2216
b733c007
PE		 2217int proto_register(struct proto *prot, int alloc_slab)
2218{
1da177e4
LT		 2219 if (alloc_slab) {
2220 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0,
271b72c7
ED		 2221 SLAB_HWCACHE_ALIGN | prot->slab_flags,
2222 NULL);
1da177e4
LT		 2223
2224 if (prot->slab == NULL) {
2225 printk(KERN_CRIT "%s: Can't create sock SLAB cache!\n",
2226 prot->name);
60e7663d 2227 goto out;
1da177e4 2228 }
2e6599cb
ACM		 2229
2230 if (prot->rsk_prot != NULL) {
2231 static const char mask[] = "request_sock_%s";
2232
7e56b5d6
CM		 2233 prot->rsk_prot->slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL);
2234 if (prot->rsk_prot->slab_name == NULL)
2e6599cb
ACM		 2235 goto out_free_sock_slab;
2236
7e56b5d6
CM		 2237 sprintf(prot->rsk_prot->slab_name, mask, prot->name);
2238 prot->rsk_prot->slab = kmem_cache_create(prot->rsk_prot->slab_name,
2e6599cb 2239 prot->rsk_prot->obj_size, 0,
20c2df83 2240 SLAB_HWCACHE_ALIGN, NULL);
2e6599cb
ACM		 2241
2242 if (prot->rsk_prot->slab == NULL) {
2243 printk(KERN_CRIT "%s: Can't create request sock SLAB cache!\n",
2244 prot->name);
2245 goto out_free_request_sock_slab_name;
2246 }
2247 }
8feaf0c0 2248
6d6ee43e 2249 if (prot->twsk_prot != NULL) {
8feaf0c0
ACM		 2250 static const char mask[] = "tw_sock_%s";
2251
7e56b5d6 2252 prot->twsk_prot->twsk_slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL);
8feaf0c0 2253
7e56b5d6 2254 if (prot->twsk_prot->twsk_slab_name == NULL)
8feaf0c0
ACM		 2255 goto out_free_request_sock_slab;
2256
7e56b5d6 2257 sprintf(prot->twsk_prot->twsk_slab_name, mask, prot->name);
6d6ee43e 2258 prot->twsk_prot->twsk_slab =
7e56b5d6 2259 kmem_cache_create(prot->twsk_prot->twsk_slab_name,
6d6ee43e 2260 prot->twsk_prot->twsk_obj_size,
3ab5aee7
ED		 2261 0,
2262 SLAB_HWCACHE_ALIGN |
2263 prot->slab_flags,
20c2df83 2264 NULL);
6d6ee43e 2265 if (prot->twsk_prot->twsk_slab == NULL)
8feaf0c0
ACM		 2266 goto out_free_timewait_sock_slab_name;
2267 }
1da177e4
LT		 2268 }
2269
2a278051 2270 write_lock(&proto_list_lock);
1da177e4 2271 list_add(&prot->node, &proto_list);
13ff3d6f 2272 assign_proto_idx(prot);
1da177e4 2273 write_unlock(&proto_list_lock);
b733c007
PE		 2274 return 0;
2275
8feaf0c0 2276out_free_timewait_sock_slab_name:
7e56b5d6 2277 kfree(prot->twsk_prot->twsk_slab_name);
8feaf0c0
ACM		 2278out_free_request_sock_slab:
2279 if (prot->rsk_prot && prot->rsk_prot->slab) {
2280 kmem_cache_destroy(prot->rsk_prot->slab);
2281 prot->rsk_prot->slab = NULL;
2282 }
2e6599cb 2283out_free_request_sock_slab_name:
7e56b5d6 2284 kfree(prot->rsk_prot->slab_name);
2e6599cb
ACM		 2285out_free_sock_slab:
2286 kmem_cache_destroy(prot->slab);
2287 prot->slab = NULL;
b733c007
PE		 2288out:
2289 return -ENOBUFS;
1da177e4 2290}
1da177e4
LT		 2291EXPORT_SYMBOL(proto_register);
2292
2293void proto_unregister(struct proto *prot)
2294{
2295 write_lock(&proto_list_lock);
13ff3d6f 2296 release_proto_idx(prot);
0a3f4358
PM		 2297 list_del(&prot->node);
2298 write_unlock(&proto_list_lock);
1da177e4
LT		 2299
2300 if (prot->slab != NULL) {
2301 kmem_cache_destroy(prot->slab);
2302 prot->slab = NULL;
2303 }
2304
2e6599cb 2305 if (prot->rsk_prot != NULL && prot->rsk_prot->slab != NULL) {
2e6599cb 2306 kmem_cache_destroy(prot->rsk_prot->slab);
7e56b5d6 2307 kfree(prot->rsk_prot->slab_name);
2e6599cb
ACM		 2308 prot->rsk_prot->slab = NULL;
2309 }
2310
6d6ee43e 2311 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) {
6d6ee43e 2312 kmem_cache_destroy(prot->twsk_prot->twsk_slab);
7e56b5d6 2313 kfree(prot->twsk_prot->twsk_slab_name);
6d6ee43e 2314 prot->twsk_prot->twsk_slab = NULL;
8feaf0c0 2315 }
1da177e4 2316}
1da177e4
LT		 2317EXPORT_SYMBOL(proto_unregister);
2318
2319#ifdef CONFIG_PROC_FS
1da177e4 2320static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
9a429c49 2321 __acquires(proto_list_lock)
1da177e4
LT		 2322{
2323 read_lock(&proto_list_lock);
60f0438a 2324 return seq_list_start_head(&proto_list, *pos);
1da177e4
LT		 2325}
2326
2327static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2328{
60f0438a 2329 return seq_list_next(v, &proto_list, pos);
1da177e4
LT		 2330}
2331
2332static void proto_seq_stop(struct seq_file *seq, void *v)
9a429c49 2333 __releases(proto_list_lock)
1da177e4
LT		 2334{
2335 read_unlock(&proto_list_lock);
2336}
2337
2338static char proto_method_implemented(const void *method)
2339{
2340 return method == NULL ? 'n' : 'y';
2341}
2342
2343static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
2344{
2345 seq_printf(seq, "%-9s %4u %6d %6d %-3s %6u %-3s %-10s "
2346 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
2347 proto->name,
2348 proto->obj_size,
14e943db 2349 sock_prot_inuse_get(seq_file_net(seq), proto),
1da177e4
LT		 2350 proto->memory_allocated != NULL ? atomic_read(proto->memory_allocated) : -1,
2351 proto->memory_pressure != NULL ? *proto->memory_pressure ? "yes" : "no" : "NI",
2352 proto->max_header,
2353 proto->slab == NULL ? "no" : "yes",
2354 module_name(proto->owner),
2355 proto_method_implemented(proto->close),
2356 proto_method_implemented(proto->connect),
2357 proto_method_implemented(proto->disconnect),
2358 proto_method_implemented(proto->accept),
2359 proto_method_implemented(proto->ioctl),
2360 proto_method_implemented(proto->init),
2361 proto_method_implemented(proto->destroy),
2362 proto_method_implemented(proto->shutdown),
2363 proto_method_implemented(proto->setsockopt),
2364 proto_method_implemented(proto->getsockopt),
2365 proto_method_implemented(proto->sendmsg),
2366 proto_method_implemented(proto->recvmsg),
2367 proto_method_implemented(proto->sendpage),
2368 proto_method_implemented(proto->bind),
2369 proto_method_implemented(proto->backlog_rcv),
2370 proto_method_implemented(proto->hash),
2371 proto_method_implemented(proto->unhash),
2372 proto_method_implemented(proto->get_port),
2373 proto_method_implemented(proto->enter_memory_pressure));
2374}
2375
2376static int proto_seq_show(struct seq_file *seq, void *v)
2377{
60f0438a 2378 if (v == &proto_list)
1da177e4
LT		 2379 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
2380 "protocol",
2381 "size",
2382 "sockets",
2383 "memory",
2384 "press",
2385 "maxhdr",
2386 "slab",
2387 "module",
2388 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
2389 else
60f0438a 2390 proto_seq_printf(seq, list_entry(v, struct proto, node));
1da177e4
LT		 2391 return 0;
2392}
2393
f690808e 2394static const struct seq_operations proto_seq_ops = {
1da177e4
LT		 2395 .start = proto_seq_start,
2396 .next = proto_seq_next,
2397 .stop = proto_seq_stop,
2398 .show = proto_seq_show,
2399};
2400
2401static int proto_seq_open(struct inode *inode, struct file *file)
2402{
14e943db
ED		 2403 return seq_open_net(inode, file, &proto_seq_ops,
2404 sizeof(struct seq_net_private));
1da177e4
LT		 2405}
2406
9a32144e 2407static const struct file_operations proto_seq_fops = {
1da177e4
LT		 2408 .owner = THIS_MODULE,
2409 .open = proto_seq_open,
2410 .read = seq_read,
2411 .llseek = seq_lseek,
14e943db
ED		 2412 .release = seq_release_net,
2413};
2414
2415static __net_init int proto_init_net(struct net *net)
2416{
2417 if (!proc_net_fops_create(net, "protocols", S_IRUGO, &proto_seq_fops))
2418 return -ENOMEM;
2419
2420 return 0;
2421}
2422
2423static __net_exit void proto_exit_net(struct net *net)
2424{
2425 proc_net_remove(net, "protocols");
2426}
2427
2428
2429static __net_initdata struct pernet_operations proto_net_ops = {
2430 .init = proto_init_net,
2431 .exit = proto_exit_net,
1da177e4
LT		 2432};
2433
2434static int __init proto_init(void)
2435{
14e943db 2436 return register_pernet_subsys(&proto_net_ops);
1da177e4
LT		 2437}
2438
2439subsys_initcall(proto_init);
2440
2441#endif /* PROC_FS */
Linux 6.x block layer and io_uring tree(s)