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sock: Introduce cred_to_ucred
[deliverable/linux.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>
3f551f94 113#include <linux/user_namespace.h>
1da177e4
LT		 114
115#include <asm/uaccess.h>
116#include <asm/system.h>
117
118#include <linux/netdevice.h>
119#include <net/protocol.h>
120#include <linux/skbuff.h>
457c4cbc 121#include <net/net_namespace.h>
2e6599cb 122#include <net/request_sock.h>
1da177e4 123#include <net/sock.h>
20d49473 124#include <linux/net_tstamp.h>
1da177e4
LT		 125#include <net/xfrm.h>
126#include <linux/ipsec.h>
f8451725 127#include <net/cls_cgroup.h>
1da177e4
LT		 128
129#include <linux/filter.h>
130
131#ifdef CONFIG_INET
132#include <net/tcp.h>
133#endif
134
da21f24d
IM		 135/*
136 * Each address family might have different locking rules, so we have
137 * one slock key per address family:
138 */
a5b5bb9a
IM		 139static struct lock_class_key af_family_keys[AF_MAX];
140static struct lock_class_key af_family_slock_keys[AF_MAX];
141
a5b5bb9a
IM		 142/*
143 * Make lock validator output more readable. (we pre-construct these
144 * strings build-time, so that runtime initialization of socket
145 * locks is fast):
146 */
36cbd3dc 147static const char *const af_family_key_strings[AF_MAX+1] = {
a5b5bb9a
IM		 148 "sk_lock-AF_UNSPEC", "sk_lock-AF_UNIX" , "sk_lock-AF_INET" ,
149 "sk_lock-AF_AX25" , "sk_lock-AF_IPX" , "sk_lock-AF_APPLETALK",
150 "sk_lock-AF_NETROM", "sk_lock-AF_BRIDGE" , "sk_lock-AF_ATMPVC" ,
151 "sk_lock-AF_X25" , "sk_lock-AF_INET6" , "sk_lock-AF_ROSE" ,
152 "sk_lock-AF_DECnet", "sk_lock-AF_NETBEUI" , "sk_lock-AF_SECURITY" ,
153 "sk_lock-AF_KEY" , "sk_lock-AF_NETLINK" , "sk_lock-AF_PACKET" ,
154 "sk_lock-AF_ASH" , "sk_lock-AF_ECONET" , "sk_lock-AF_ATMSVC" ,
cbd151bf 155 "sk_lock-AF_RDS" , "sk_lock-AF_SNA" , "sk_lock-AF_IRDA" ,
a5b5bb9a 156 "sk_lock-AF_PPPOX" , "sk_lock-AF_WANPIPE" , "sk_lock-AF_LLC" ,
cd05acfe 157 "sk_lock-27" , "sk_lock-28" , "sk_lock-AF_CAN" ,
17926a79 158 "sk_lock-AF_TIPC" , "sk_lock-AF_BLUETOOTH", "sk_lock-IUCV" ,
bce7b154 159 "sk_lock-AF_RXRPC" , "sk_lock-AF_ISDN" , "sk_lock-AF_PHONET" ,
fe33147a 160 "sk_lock-AF_IEEE802154", "sk_lock-AF_CAIF" ,
bce7b154 161 "sk_lock-AF_MAX"
a5b5bb9a 162};
36cbd3dc 163static const char *const af_family_slock_key_strings[AF_MAX+1] = {
a5b5bb9a
IM		 164 "slock-AF_UNSPEC", "slock-AF_UNIX" , "slock-AF_INET" ,
165 "slock-AF_AX25" , "slock-AF_IPX" , "slock-AF_APPLETALK",
166 "slock-AF_NETROM", "slock-AF_BRIDGE" , "slock-AF_ATMPVC" ,
167 "slock-AF_X25" , "slock-AF_INET6" , "slock-AF_ROSE" ,
168 "slock-AF_DECnet", "slock-AF_NETBEUI" , "slock-AF_SECURITY" ,
169 "slock-AF_KEY" , "slock-AF_NETLINK" , "slock-AF_PACKET" ,
170 "slock-AF_ASH" , "slock-AF_ECONET" , "slock-AF_ATMSVC" ,
cbd151bf 171 "slock-AF_RDS" , "slock-AF_SNA" , "slock-AF_IRDA" ,
a5b5bb9a 172 "slock-AF_PPPOX" , "slock-AF_WANPIPE" , "slock-AF_LLC" ,
cd05acfe 173 "slock-27" , "slock-28" , "slock-AF_CAN" ,
17926a79 174 "slock-AF_TIPC" , "slock-AF_BLUETOOTH", "slock-AF_IUCV" ,
bce7b154 175 "slock-AF_RXRPC" , "slock-AF_ISDN" , "slock-AF_PHONET" ,
fe33147a 176 "slock-AF_IEEE802154", "slock-AF_CAIF" ,
bce7b154 177 "slock-AF_MAX"
a5b5bb9a 178};
36cbd3dc 179static const char *const af_family_clock_key_strings[AF_MAX+1] = {
443aef0e
PZ		 180 "clock-AF_UNSPEC", "clock-AF_UNIX" , "clock-AF_INET" ,
181 "clock-AF_AX25" , "clock-AF_IPX" , "clock-AF_APPLETALK",
182 "clock-AF_NETROM", "clock-AF_BRIDGE" , "clock-AF_ATMPVC" ,
183 "clock-AF_X25" , "clock-AF_INET6" , "clock-AF_ROSE" ,
184 "clock-AF_DECnet", "clock-AF_NETBEUI" , "clock-AF_SECURITY" ,
185 "clock-AF_KEY" , "clock-AF_NETLINK" , "clock-AF_PACKET" ,
186 "clock-AF_ASH" , "clock-AF_ECONET" , "clock-AF_ATMSVC" ,
cbd151bf 187 "clock-AF_RDS" , "clock-AF_SNA" , "clock-AF_IRDA" ,
443aef0e 188 "clock-AF_PPPOX" , "clock-AF_WANPIPE" , "clock-AF_LLC" ,
b4942af6 189 "clock-27" , "clock-28" , "clock-AF_CAN" ,
e51f802b 190 "clock-AF_TIPC" , "clock-AF_BLUETOOTH", "clock-AF_IUCV" ,
bce7b154 191 "clock-AF_RXRPC" , "clock-AF_ISDN" , "clock-AF_PHONET" ,
fe33147a 192 "clock-AF_IEEE802154", "clock-AF_CAIF" ,
bce7b154 193 "clock-AF_MAX"
443aef0e 194};
da21f24d
IM		 195
196/*
197 * sk_callback_lock locking rules are per-address-family,
198 * so split the lock classes by using a per-AF key:
199 */
200static struct lock_class_key af_callback_keys[AF_MAX];
201
1da177e4
LT		 202/* Take into consideration the size of the struct sk_buff overhead in the
203 * determination of these values, since that is non-constant across
204 * platforms. This makes socket queueing behavior and performance
205 * not depend upon such differences.
206 */
207#define _SK_MEM_PACKETS 256
208#define _SK_MEM_OVERHEAD (sizeof(struct sk_buff) + 256)
209#define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
210#define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
211
212/* Run time adjustable parameters. */
ab32ea5d
BH		 213__u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX;
214__u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX;
215__u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX;
216__u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX;
1da177e4
LT		 217
218/* Maximal space eaten by iovec or ancilliary data plus some space */
ab32ea5d 219int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512);
2a91525c 220EXPORT_SYMBOL(sysctl_optmem_max);
1da177e4 221
f8451725
HX		 222#if defined(CONFIG_CGROUPS) && !defined(CONFIG_NET_CLS_CGROUP)
223int net_cls_subsys_id = -1;
224EXPORT_SYMBOL_GPL(net_cls_subsys_id);
225#endif
226
1da177e4
LT		 227static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen)
228{
229 struct timeval tv;
230
231 if (optlen < sizeof(tv))
232 return -EINVAL;
233 if (copy_from_user(&tv, optval, sizeof(tv)))
234 return -EFAULT;
ba78073e
VA		 235 if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC)
236 return -EDOM;
1da177e4 237
ba78073e 238 if (tv.tv_sec < 0) {
6f11df83
AM		 239 static int warned __read_mostly;
240
ba78073e 241 *timeo_p = 0;
50aab54f 242 if (warned < 10 && net_ratelimit()) {
ba78073e
VA		 243 warned++;
244 printk(KERN_INFO "sock_set_timeout: `%s' (pid %d) "
245 "tries to set negative timeout\n",
ba25f9dc 246 current->comm, task_pid_nr(current));
50aab54f 247 }
ba78073e
VA		 248 return 0;
249 }
1da177e4
LT		 250 *timeo_p = MAX_SCHEDULE_TIMEOUT;
251 if (tv.tv_sec == 0 && tv.tv_usec == 0)
252 return 0;
253 if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1))
254 *timeo_p = tv.tv_sec*HZ + (tv.tv_usec+(1000000/HZ-1))/(1000000/HZ);
255 return 0;
256}
257
258static void sock_warn_obsolete_bsdism(const char *name)
259{
260 static int warned;
261 static char warncomm[TASK_COMM_LEN];
4ec93edb
YH		 262 if (strcmp(warncomm, current->comm) && warned < 5) {
263 strcpy(warncomm, current->comm);
1da177e4
LT		 264 printk(KERN_WARNING "process `%s' is using obsolete "
265 "%s SO_BSDCOMPAT\n", warncomm, name);
266 warned++;
267 }
268}
269
20d49473 270static void sock_disable_timestamp(struct sock *sk, int flag)
4ec93edb 271{
20d49473
PO		 272 if (sock_flag(sk, flag)) {
273 sock_reset_flag(sk, flag);
274 if (!sock_flag(sk, SOCK_TIMESTAMP) &&
275 !sock_flag(sk, SOCK_TIMESTAMPING_RX_SOFTWARE)) {
276 net_disable_timestamp();
277 }
1da177e4
LT		 278 }
279}
280
281
f0088a50
DV		 282int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
283{
766e9037 284 int err;
f0088a50 285 int skb_len;
3b885787
NH		 286 unsigned long flags;
287 struct sk_buff_head *list = &sk->sk_receive_queue;
f0088a50 288
9ee6b7f1 289 /* Cast sk->rcvbuf to unsigned... It's pointless, but reduces
f0088a50
DV		 290 number of warnings when compiling with -W --ANK
291 */
292 if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >=
293 (unsigned)sk->sk_rcvbuf) {
766e9037
ED		 294 atomic_inc(&sk->sk_drops);
295 return -ENOMEM;
f0088a50
DV		 296 }
297
fda9ef5d 298 err = sk_filter(sk, skb);
f0088a50 299 if (err)
766e9037 300 return err;
f0088a50 301
3ab224be 302 if (!sk_rmem_schedule(sk, skb->truesize)) {
766e9037
ED		 303 atomic_inc(&sk->sk_drops);
304 return -ENOBUFS;
3ab224be
HA		 305 }
306
f0088a50
DV		 307 skb->dev = NULL;
308 skb_set_owner_r(skb, sk);
49ad9599 309
f0088a50
DV		 310 /* Cache the SKB length before we tack it onto the receive
311 * queue. Once it is added it no longer belongs to us and
312 * may be freed by other threads of control pulling packets
313 * from the queue.
314 */
315 skb_len = skb->len;
316
7fee226a
ED		 317 /* we escape from rcu protected region, make sure we dont leak
318 * a norefcounted dst
319 */
320 skb_dst_force(skb);
321
3b885787
NH		 322 spin_lock_irqsave(&list->lock, flags);
323 skb->dropcount = atomic_read(&sk->sk_drops);
324 __skb_queue_tail(list, skb);
325 spin_unlock_irqrestore(&list->lock, flags);
f0088a50
DV		 326
327 if (!sock_flag(sk, SOCK_DEAD))
328 sk->sk_data_ready(sk, skb_len);
766e9037 329 return 0;
f0088a50
DV		 330}
331EXPORT_SYMBOL(sock_queue_rcv_skb);
332
58a5a7b9 333int sk_receive_skb(struct sock *sk, struct sk_buff *skb, const int nested)
f0088a50
DV		 334{
335 int rc = NET_RX_SUCCESS;
336
fda9ef5d 337 if (sk_filter(sk, skb))
f0088a50
DV		 338 goto discard_and_relse;
339
340 skb->dev = NULL;
341
c377411f
ED		 342 if (sk_rcvqueues_full(sk, skb)) {
343 atomic_inc(&sk->sk_drops);
344 goto discard_and_relse;
345 }
58a5a7b9
ACM		 346 if (nested)
347 bh_lock_sock_nested(sk);
348 else
349 bh_lock_sock(sk);
a5b5bb9a
IM		 350 if (!sock_owned_by_user(sk)) {
351 /*
352 * trylock + unlock semantics:
353 */
354 mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_);
355
c57943a1 356 rc = sk_backlog_rcv(sk, skb);
a5b5bb9a
IM		 357
358 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
a3a858ff 359 } else if (sk_add_backlog(sk, skb)) {
8eae939f
ZY		 360 bh_unlock_sock(sk);
361 atomic_inc(&sk->sk_drops);
362 goto discard_and_relse;
363 }
364
f0088a50
DV		 365 bh_unlock_sock(sk);
366out:
367 sock_put(sk);
368 return rc;
369discard_and_relse:
370 kfree_skb(skb);
371 goto out;
372}
373EXPORT_SYMBOL(sk_receive_skb);
374
ea94ff3b
KK		 375void sk_reset_txq(struct sock *sk)
376{
377 sk_tx_queue_clear(sk);
378}
379EXPORT_SYMBOL(sk_reset_txq);
380
f0088a50
DV		 381struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie)
382{
b6c6712a 383 struct dst_entry *dst = __sk_dst_get(sk);
f0088a50
DV		 384
385 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
e022f0b4 386 sk_tx_queue_clear(sk);
b6c6712a 387 rcu_assign_pointer(sk->sk_dst_cache, NULL);
f0088a50
DV		 388 dst_release(dst);
389 return NULL;
390 }
391
392 return dst;
393}
394EXPORT_SYMBOL(__sk_dst_check);
395
396struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie)
397{
398 struct dst_entry *dst = sk_dst_get(sk);
399
400 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
401 sk_dst_reset(sk);
402 dst_release(dst);
403 return NULL;
404 }
405
406 return dst;
407}
408EXPORT_SYMBOL(sk_dst_check);
409
4878809f
DM		 410static int sock_bindtodevice(struct sock *sk, char __user *optval, int optlen)
411{
412 int ret = -ENOPROTOOPT;
413#ifdef CONFIG_NETDEVICES
3b1e0a65 414 struct net *net = sock_net(sk);
4878809f
DM		 415 char devname[IFNAMSIZ];
416 int index;
417
418 /* Sorry... */
419 ret = -EPERM;
420 if (!capable(CAP_NET_RAW))
421 goto out;
422
423 ret = -EINVAL;
424 if (optlen < 0)
425 goto out;
426
427 /* Bind this socket to a particular device like "eth0",
428 * as specified in the passed interface name. If the
429 * name is "" or the option length is zero the socket
430 * is not bound.
431 */
432 if (optlen > IFNAMSIZ - 1)
433 optlen = IFNAMSIZ - 1;
434 memset(devname, 0, sizeof(devname));
435
436 ret = -EFAULT;
437 if (copy_from_user(devname, optval, optlen))
438 goto out;
439
000ba2e4
DM		 440 index = 0;
441 if (devname[0] != '\0') {
bf8e56bf 442 struct net_device *dev;
4878809f 443
bf8e56bf
ED		 444 rcu_read_lock();
445 dev = dev_get_by_name_rcu(net, devname);
446 if (dev)
447 index = dev->ifindex;
448 rcu_read_unlock();
4878809f
DM		 449 ret = -ENODEV;
450 if (!dev)
451 goto out;
4878809f
DM		 452 }
453
454 lock_sock(sk);
455 sk->sk_bound_dev_if = index;
456 sk_dst_reset(sk);
457 release_sock(sk);
458
459 ret = 0;
460
461out:
462#endif
463
464 return ret;
465}
466
c0ef877b
PE		 467static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool)
468{
469 if (valbool)
470 sock_set_flag(sk, bit);
471 else
472 sock_reset_flag(sk, bit);
473}
474
1da177e4
LT		 475/*
476 * This is meant for all protocols to use and covers goings on
477 * at the socket level. Everything here is generic.
478 */
479
480int sock_setsockopt(struct socket *sock, int level, int optname,
b7058842 481 char __user *optval, unsigned int optlen)
1da177e4 482{
2a91525c 483 struct sock *sk = sock->sk;
1da177e4
LT		 484 int val;
485 int valbool;
486 struct linger ling;
487 int ret = 0;
4ec93edb 488
1da177e4
LT		 489 /*
490 * Options without arguments
491 */
492
4878809f
DM		 493 if (optname == SO_BINDTODEVICE)
494 return sock_bindtodevice(sk, optval, optlen);
495
e71a4783
SH		 496 if (optlen < sizeof(int))
497 return -EINVAL;
4ec93edb 498
1da177e4
LT		 499 if (get_user(val, (int __user *)optval))
500 return -EFAULT;
4ec93edb 501
2a91525c 502 valbool = val ? 1 : 0;
1da177e4
LT		 503
504 lock_sock(sk);
505
2a91525c 506 switch (optname) {
e71a4783 507 case SO_DEBUG:
2a91525c 508 if (val && !capable(CAP_NET_ADMIN))
e71a4783 509 ret = -EACCES;
2a91525c 510 else
c0ef877b 511 sock_valbool_flag(sk, SOCK_DBG, valbool);
e71a4783
SH		 512 break;
513 case SO_REUSEADDR:
514 sk->sk_reuse = valbool;
515 break;
516 case SO_TYPE:
49c794e9 517 case SO_PROTOCOL:
0d6038ee 518 case SO_DOMAIN:
e71a4783
SH		 519 case SO_ERROR:
520 ret = -ENOPROTOOPT;
521 break;
522 case SO_DONTROUTE:
c0ef877b 523 sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool);
e71a4783
SH		 524 break;
525 case SO_BROADCAST:
526 sock_valbool_flag(sk, SOCK_BROADCAST, valbool);
527 break;
528 case SO_SNDBUF:
529 /* Don't error on this BSD doesn't and if you think
530 about it this is right. Otherwise apps have to
531 play 'guess the biggest size' games. RCVBUF/SNDBUF
532 are treated in BSD as hints */
533
534 if (val > sysctl_wmem_max)
535 val = sysctl_wmem_max;
b0573dea 536set_sndbuf:
e71a4783
SH		 537 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
538 if ((val * 2) < SOCK_MIN_SNDBUF)
539 sk->sk_sndbuf = SOCK_MIN_SNDBUF;
540 else
541 sk->sk_sndbuf = val * 2;
1da177e4 542
e71a4783
SH		 543 /*
544 * Wake up sending tasks if we
545 * upped the value.
546 */
547 sk->sk_write_space(sk);
548 break;
1da177e4 549
e71a4783
SH		 550 case SO_SNDBUFFORCE:
551 if (!capable(CAP_NET_ADMIN)) {
552 ret = -EPERM;
553 break;
554 }
555 goto set_sndbuf;
b0573dea 556
e71a4783
SH		 557 case SO_RCVBUF:
558 /* Don't error on this BSD doesn't and if you think
559 about it this is right. Otherwise apps have to
560 play 'guess the biggest size' games. RCVBUF/SNDBUF
561 are treated in BSD as hints */
4ec93edb 562
e71a4783
SH		 563 if (val > sysctl_rmem_max)
564 val = sysctl_rmem_max;
b0573dea 565set_rcvbuf:
e71a4783
SH		 566 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
567 /*
568 * We double it on the way in to account for
569 * "struct sk_buff" etc. overhead. Applications
570 * assume that the SO_RCVBUF setting they make will
571 * allow that much actual data to be received on that
572 * socket.
573 *
574 * Applications are unaware that "struct sk_buff" and
575 * other overheads allocate from the receive buffer
576 * during socket buffer allocation.
577 *
578 * And after considering the possible alternatives,
579 * returning the value we actually used in getsockopt
580 * is the most desirable behavior.
581 */
582 if ((val * 2) < SOCK_MIN_RCVBUF)
583 sk->sk_rcvbuf = SOCK_MIN_RCVBUF;
584 else
585 sk->sk_rcvbuf = val * 2;
586 break;
587
588 case SO_RCVBUFFORCE:
589 if (!capable(CAP_NET_ADMIN)) {
590 ret = -EPERM;
1da177e4 591 break;
e71a4783
SH		 592 }
593 goto set_rcvbuf;
1da177e4 594
e71a4783 595 case SO_KEEPALIVE:
1da177e4 596#ifdef CONFIG_INET
e71a4783
SH		 597 if (sk->sk_protocol == IPPROTO_TCP)
598 tcp_set_keepalive(sk, valbool);
1da177e4 599#endif
e71a4783
SH		 600 sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool);
601 break;
602
603 case SO_OOBINLINE:
604 sock_valbool_flag(sk, SOCK_URGINLINE, valbool);
605 break;
606
607 case SO_NO_CHECK:
608 sk->sk_no_check = valbool;
609 break;
610
611 case SO_PRIORITY:
612 if ((val >= 0 && val <= 6) || capable(CAP_NET_ADMIN))
613 sk->sk_priority = val;
614 else
615 ret = -EPERM;
616 break;
617
618 case SO_LINGER:
619 if (optlen < sizeof(ling)) {
620 ret = -EINVAL; /* 1003.1g */
1da177e4 621 break;
e71a4783 622 }
2a91525c 623 if (copy_from_user(&ling, optval, sizeof(ling))) {
e71a4783 624 ret = -EFAULT;
1da177e4 625 break;
e71a4783
SH		 626 }
627 if (!ling.l_onoff)
628 sock_reset_flag(sk, SOCK_LINGER);
629 else {
1da177e4 630#if (BITS_PER_LONG == 32)
e71a4783
SH		 631 if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ)
632 sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT;
1da177e4 633 else
e71a4783
SH		 634#endif
635 sk->sk_lingertime = (unsigned int)ling.l_linger * HZ;
636 sock_set_flag(sk, SOCK_LINGER);
637 }
638 break;
639
640 case SO_BSDCOMPAT:
641 sock_warn_obsolete_bsdism("setsockopt");
642 break;
643
644 case SO_PASSCRED:
645 if (valbool)
646 set_bit(SOCK_PASSCRED, &sock->flags);
647 else
648 clear_bit(SOCK_PASSCRED, &sock->flags);
649 break;
650
651 case SO_TIMESTAMP:
92f37fd2 652 case SO_TIMESTAMPNS:
e71a4783 653 if (valbool) {
92f37fd2
ED		 654 if (optname == SO_TIMESTAMP)
655 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
656 else
657 sock_set_flag(sk, SOCK_RCVTSTAMPNS);
e71a4783 658 sock_set_flag(sk, SOCK_RCVTSTAMP);
20d49473 659 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
92f37fd2 660 } else {
e71a4783 661 sock_reset_flag(sk, SOCK_RCVTSTAMP);
92f37fd2
ED		 662 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
663 }
e71a4783
SH		 664 break;
665
20d49473
PO		 666 case SO_TIMESTAMPING:
667 if (val & ~SOF_TIMESTAMPING_MASK) {
f249fb78 668 ret = -EINVAL;
20d49473
PO		 669 break;
670 }
671 sock_valbool_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE,
672 val & SOF_TIMESTAMPING_TX_HARDWARE);
673 sock_valbool_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE,
674 val & SOF_TIMESTAMPING_TX_SOFTWARE);
675 sock_valbool_flag(sk, SOCK_TIMESTAMPING_RX_HARDWARE,
676 val & SOF_TIMESTAMPING_RX_HARDWARE);
677 if (val & SOF_TIMESTAMPING_RX_SOFTWARE)
678 sock_enable_timestamp(sk,
679 SOCK_TIMESTAMPING_RX_SOFTWARE);
680 else
681 sock_disable_timestamp(sk,
682 SOCK_TIMESTAMPING_RX_SOFTWARE);
683 sock_valbool_flag(sk, SOCK_TIMESTAMPING_SOFTWARE,
684 val & SOF_TIMESTAMPING_SOFTWARE);
685 sock_valbool_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE,
686 val & SOF_TIMESTAMPING_SYS_HARDWARE);
687 sock_valbool_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE,
688 val & SOF_TIMESTAMPING_RAW_HARDWARE);
689 break;
690
e71a4783
SH		 691 case SO_RCVLOWAT:
692 if (val < 0)
693 val = INT_MAX;
694 sk->sk_rcvlowat = val ? : 1;
695 break;
696
697 case SO_RCVTIMEO:
698 ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen);
699 break;
700
701 case SO_SNDTIMEO:
702 ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen);
703 break;
1da177e4 704
e71a4783
SH		 705 case SO_ATTACH_FILTER:
706 ret = -EINVAL;
707 if (optlen == sizeof(struct sock_fprog)) {
708 struct sock_fprog fprog;
1da177e4 709
e71a4783
SH		 710 ret = -EFAULT;
711 if (copy_from_user(&fprog, optval, sizeof(fprog)))
1da177e4 712 break;
e71a4783
SH		 713
714 ret = sk_attach_filter(&fprog, sk);
715 }
716 break;
717
718 case SO_DETACH_FILTER:
55b33325 719 ret = sk_detach_filter(sk);
e71a4783 720 break;
1da177e4 721
e71a4783
SH		 722 case SO_PASSSEC:
723 if (valbool)
724 set_bit(SOCK_PASSSEC, &sock->flags);
725 else
726 clear_bit(SOCK_PASSSEC, &sock->flags);
727 break;
4a19ec58
LAT		 728 case SO_MARK:
729 if (!capable(CAP_NET_ADMIN))
730 ret = -EPERM;
2a91525c 731 else
4a19ec58 732 sk->sk_mark = val;
4a19ec58 733 break;
877ce7c1 734
1da177e4
LT		 735 /* We implement the SO_SNDLOWAT etc to
736 not be settable (1003.1g 5.3) */
3b885787
NH		 737 case SO_RXQ_OVFL:
738 if (valbool)
739 sock_set_flag(sk, SOCK_RXQ_OVFL);
740 else
741 sock_reset_flag(sk, SOCK_RXQ_OVFL);
742 break;
e71a4783
SH		 743 default:
744 ret = -ENOPROTOOPT;
745 break;
4ec93edb 746 }
1da177e4
LT		 747 release_sock(sk);
748 return ret;
749}
2a91525c 750EXPORT_SYMBOL(sock_setsockopt);
1da177e4
LT		 751
752
3f551f94
EB		 753void cred_to_ucred(struct pid *pid, const struct cred *cred,
754 struct ucred *ucred)
755{
756 ucred->pid = pid_vnr(pid);
757 ucred->uid = ucred->gid = -1;
758 if (cred) {
759 struct user_namespace *current_ns = current_user_ns();
760
761 ucred->uid = user_ns_map_uid(current_ns, cred, cred->euid);
762 ucred->gid = user_ns_map_gid(current_ns, cred, cred->egid);
763 }
764}
765
1da177e4
LT		 766int sock_getsockopt(struct socket *sock, int level, int optname,
767 char __user *optval, int __user *optlen)
768{
769 struct sock *sk = sock->sk;
4ec93edb 770
e71a4783 771 union {
4ec93edb
YH		 772 int val;
773 struct linger ling;
1da177e4
LT		 774 struct timeval tm;
775 } v;
4ec93edb 776
4d0392be 777 int lv = sizeof(int);
1da177e4 778 int len;
4ec93edb 779
e71a4783 780 if (get_user(len, optlen))
4ec93edb 781 return -EFAULT;
e71a4783 782 if (len < 0)
1da177e4 783 return -EINVAL;
4ec93edb 784
50fee1de 785 memset(&v, 0, sizeof(v));
df0bca04 786
2a91525c 787 switch (optname) {
e71a4783
SH		 788 case SO_DEBUG:
789 v.val = sock_flag(sk, SOCK_DBG);
790 break;
791
792 case SO_DONTROUTE:
793 v.val = sock_flag(sk, SOCK_LOCALROUTE);
794 break;
795
796 case SO_BROADCAST:
797 v.val = !!sock_flag(sk, SOCK_BROADCAST);
798 break;
799
800 case SO_SNDBUF:
801 v.val = sk->sk_sndbuf;
802 break;
803
804 case SO_RCVBUF:
805 v.val = sk->sk_rcvbuf;
806 break;
807
808 case SO_REUSEADDR:
809 v.val = sk->sk_reuse;
810 break;
811
812 case SO_KEEPALIVE:
813 v.val = !!sock_flag(sk, SOCK_KEEPOPEN);
814 break;
815
816 case SO_TYPE:
817 v.val = sk->sk_type;
818 break;
819
49c794e9
JE		 820 case SO_PROTOCOL:
821 v.val = sk->sk_protocol;
822 break;
823
0d6038ee
JE		 824 case SO_DOMAIN:
825 v.val = sk->sk_family;
826 break;
827
e71a4783
SH		 828 case SO_ERROR:
829 v.val = -sock_error(sk);
2a91525c 830 if (v.val == 0)
e71a4783
SH		 831 v.val = xchg(&sk->sk_err_soft, 0);
832 break;
833
834 case SO_OOBINLINE:
835 v.val = !!sock_flag(sk, SOCK_URGINLINE);
836 break;
837
838 case SO_NO_CHECK:
839 v.val = sk->sk_no_check;
840 break;
841
842 case SO_PRIORITY:
843 v.val = sk->sk_priority;
844 break;
845
846 case SO_LINGER:
847 lv = sizeof(v.ling);
848 v.ling.l_onoff = !!sock_flag(sk, SOCK_LINGER);
849 v.ling.l_linger = sk->sk_lingertime / HZ;
850 break;
851
852 case SO_BSDCOMPAT:
853 sock_warn_obsolete_bsdism("getsockopt");
854 break;
855
856 case SO_TIMESTAMP:
92f37fd2
ED		 857 v.val = sock_flag(sk, SOCK_RCVTSTAMP) &&
858 !sock_flag(sk, SOCK_RCVTSTAMPNS);
859 break;
860
861 case SO_TIMESTAMPNS:
862 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS);
e71a4783
SH		 863 break;
864
20d49473
PO		 865 case SO_TIMESTAMPING:
866 v.val = 0;
867 if (sock_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE))
868 v.val |= SOF_TIMESTAMPING_TX_HARDWARE;
869 if (sock_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE))
870 v.val |= SOF_TIMESTAMPING_TX_SOFTWARE;
871 if (sock_flag(sk, SOCK_TIMESTAMPING_RX_HARDWARE))
872 v.val |= SOF_TIMESTAMPING_RX_HARDWARE;
873 if (sock_flag(sk, SOCK_TIMESTAMPING_RX_SOFTWARE))
874 v.val |= SOF_TIMESTAMPING_RX_SOFTWARE;
875 if (sock_flag(sk, SOCK_TIMESTAMPING_SOFTWARE))
876 v.val |= SOF_TIMESTAMPING_SOFTWARE;
877 if (sock_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE))
878 v.val |= SOF_TIMESTAMPING_SYS_HARDWARE;
879 if (sock_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE))
880 v.val |= SOF_TIMESTAMPING_RAW_HARDWARE;
881 break;
882
e71a4783 883 case SO_RCVTIMEO:
2a91525c 884 lv = sizeof(struct timeval);
e71a4783
SH		 885 if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) {
886 v.tm.tv_sec = 0;
887 v.tm.tv_usec = 0;
888 } else {
889 v.tm.tv_sec = sk->sk_rcvtimeo / HZ;
890 v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ;
891 }
892 break;
893
894 case SO_SNDTIMEO:
2a91525c 895 lv = sizeof(struct timeval);
e71a4783
SH		 896 if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) {
897 v.tm.tv_sec = 0;
898 v.tm.tv_usec = 0;
899 } else {
900 v.tm.tv_sec = sk->sk_sndtimeo / HZ;
901 v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ;
902 }
903 break;
1da177e4 904
e71a4783
SH		 905 case SO_RCVLOWAT:
906 v.val = sk->sk_rcvlowat;
907 break;
1da177e4 908
e71a4783 909 case SO_SNDLOWAT:
2a91525c 910 v.val = 1;
e71a4783 911 break;
1da177e4 912
e71a4783
SH		 913 case SO_PASSCRED:
914 v.val = test_bit(SOCK_PASSCRED, &sock->flags) ? 1 : 0;
915 break;
1da177e4 916
e71a4783
SH		 917 case SO_PEERCRED:
918 if (len > sizeof(sk->sk_peercred))
919 len = sizeof(sk->sk_peercred);
920 if (copy_to_user(optval, &sk->sk_peercred, len))
921 return -EFAULT;
922 goto lenout;
1da177e4 923
e71a4783
SH		 924 case SO_PEERNAME:
925 {
926 char address[128];
927
928 if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2))
929 return -ENOTCONN;
930 if (lv < len)
931 return -EINVAL;
932 if (copy_to_user(optval, address, len))
933 return -EFAULT;
934 goto lenout;
935 }
1da177e4 936
e71a4783
SH		 937 /* Dubious BSD thing... Probably nobody even uses it, but
938 * the UNIX standard wants it for whatever reason... -DaveM
939 */
940 case SO_ACCEPTCONN:
941 v.val = sk->sk_state == TCP_LISTEN;
942 break;
1da177e4 943
e71a4783
SH		 944 case SO_PASSSEC:
945 v.val = test_bit(SOCK_PASSSEC, &sock->flags) ? 1 : 0;
946 break;
877ce7c1 947
e71a4783
SH		 948 case SO_PEERSEC:
949 return security_socket_getpeersec_stream(sock, optval, optlen, len);
1da177e4 950
4a19ec58
LAT		 951 case SO_MARK:
952 v.val = sk->sk_mark;
953 break;
954
3b885787
NH		 955 case SO_RXQ_OVFL:
956 v.val = !!sock_flag(sk, SOCK_RXQ_OVFL);
957 break;
958
e71a4783
SH		 959 default:
960 return -ENOPROTOOPT;
1da177e4 961 }
e71a4783 962
1da177e4
LT		 963 if (len > lv)
964 len = lv;
965 if (copy_to_user(optval, &v, len))
966 return -EFAULT;
967lenout:
4ec93edb
YH		 968 if (put_user(len, optlen))
969 return -EFAULT;
970 return 0;
1da177e4
LT		 971}
972
a5b5bb9a
IM		 973/*
974 * Initialize an sk_lock.
975 *
976 * (We also register the sk_lock with the lock validator.)
977 */
b6f99a21 978static inline void sock_lock_init(struct sock *sk)
a5b5bb9a 979{
ed07536e
PZ		 980 sock_lock_init_class_and_name(sk,
981 af_family_slock_key_strings[sk->sk_family],
982 af_family_slock_keys + sk->sk_family,
983 af_family_key_strings[sk->sk_family],
984 af_family_keys + sk->sk_family);
a5b5bb9a
IM		 985}
986
4dc6dc71
ED		 987/*
988 * Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet,
989 * even temporarly, because of RCU lookups. sk_node should also be left as is.
990 */
f1a6c4da
PE		 991static void sock_copy(struct sock *nsk, const struct sock *osk)
992{
993#ifdef CONFIG_SECURITY_NETWORK
994 void *sptr = nsk->sk_security;
995#endif
4dc6dc71 996 BUILD_BUG_ON(offsetof(struct sock, sk_copy_start) !=
e022f0b4
KK		 997 sizeof(osk->sk_node) + sizeof(osk->sk_refcnt) +
998 sizeof(osk->sk_tx_queue_mapping));
4dc6dc71
ED		 999 memcpy(&nsk->sk_copy_start, &osk->sk_copy_start,
1000 osk->sk_prot->obj_size - offsetof(struct sock, sk_copy_start));
f1a6c4da
PE		 1001#ifdef CONFIG_SECURITY_NETWORK
1002 nsk->sk_security = sptr;
1003 security_sk_clone(osk, nsk);
1004#endif
1005}
1006
2e4afe7b
PE		 1007static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority,
1008 int family)
c308c1b2
PE		 1009{
1010 struct sock *sk;
1011 struct kmem_cache *slab;
1012
1013 slab = prot->slab;
e912b114
ED		 1014 if (slab != NULL) {
1015 sk = kmem_cache_alloc(slab, priority & ~__GFP_ZERO);
1016 if (!sk)
1017 return sk;
1018 if (priority & __GFP_ZERO) {
1019 /*
1020 * caches using SLAB_DESTROY_BY_RCU should let
1021 * sk_node.next un-modified. Special care is taken
1022 * when initializing object to zero.
1023 */
1024 if (offsetof(struct sock, sk_node.next) != 0)
1025 memset(sk, 0, offsetof(struct sock, sk_node.next));
1026 memset(&sk->sk_node.pprev, 0,
1027 prot->obj_size - offsetof(struct sock,
1028 sk_node.pprev));
1029 }
1030 }
c308c1b2
PE		 1031 else
1032 sk = kmalloc(prot->obj_size, priority);
1033
2e4afe7b 1034 if (sk != NULL) {
a98b65a3
VN		 1035 kmemcheck_annotate_bitfield(sk, flags);
1036
2e4afe7b
PE		 1037 if (security_sk_alloc(sk, family, priority))
1038 goto out_free;
1039
1040 if (!try_module_get(prot->owner))
1041 goto out_free_sec;
e022f0b4 1042 sk_tx_queue_clear(sk);
2e4afe7b
PE		 1043 }
1044
c308c1b2 1045 return sk;
2e4afe7b
PE		 1046
1047out_free_sec:
1048 security_sk_free(sk);
1049out_free:
1050 if (slab != NULL)
1051 kmem_cache_free(slab, sk);
1052 else
1053 kfree(sk);
1054 return NULL;
c308c1b2
PE		 1055}
1056
1057static void sk_prot_free(struct proto *prot, struct sock *sk)
1058{
1059 struct kmem_cache *slab;
2e4afe7b 1060 struct module *owner;
c308c1b2 1061
2e4afe7b 1062 owner = prot->owner;
c308c1b2 1063 slab = prot->slab;
2e4afe7b
PE		 1064
1065 security_sk_free(sk);
c308c1b2
PE		 1066 if (slab != NULL)
1067 kmem_cache_free(slab, sk);
1068 else
1069 kfree(sk);
2e4afe7b 1070 module_put(owner);
c308c1b2
PE		 1071}
1072
f8451725
HX		 1073#ifdef CONFIG_CGROUPS
1074void sock_update_classid(struct sock *sk)
1075{
1076 u32 classid = task_cls_classid(current);
1077
1078 if (classid && classid != sk->sk_classid)
1079 sk->sk_classid = classid;
1080}
82862742 1081EXPORT_SYMBOL(sock_update_classid);
f8451725
HX		 1082#endif
1083
1da177e4
LT		 1084/**
1085 * sk_alloc - All socket objects are allocated here
c4ea43c5 1086 * @net: the applicable net namespace
4dc3b16b
PP		 1087 * @family: protocol family
1088 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1089 * @prot: struct proto associated with this new sock instance
1da177e4 1090 */
1b8d7ae4 1091struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
6257ff21 1092 struct proto *prot)
1da177e4 1093{
c308c1b2 1094 struct sock *sk;
1da177e4 1095
154adbc8 1096 sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family);
1da177e4 1097 if (sk) {
154adbc8
PE		 1098 sk->sk_family = family;
1099 /*
1100 * See comment in struct sock definition to understand
1101 * why we need sk_prot_creator -acme
1102 */
1103 sk->sk_prot = sk->sk_prot_creator = prot;
1104 sock_lock_init(sk);
3b1e0a65 1105 sock_net_set(sk, get_net(net));
d66ee058 1106 atomic_set(&sk->sk_wmem_alloc, 1);
f8451725
HX		 1107
1108 sock_update_classid(sk);
1da177e4 1109 }
a79af59e 1110
2e4afe7b 1111 return sk;
1da177e4 1112}
2a91525c 1113EXPORT_SYMBOL(sk_alloc);
1da177e4 1114
2b85a34e 1115static void __sk_free(struct sock *sk)
1da177e4
LT		 1116{
1117 struct sk_filter *filter;
1da177e4
LT		 1118
1119 if (sk->sk_destruct)
1120 sk->sk_destruct(sk);
1121
a898def2
PM		 1122 filter = rcu_dereference_check(sk->sk_filter,
1123 atomic_read(&sk->sk_wmem_alloc) == 0);
1da177e4 1124 if (filter) {
309dd5fc 1125 sk_filter_uncharge(sk, filter);
fda9ef5d 1126 rcu_assign_pointer(sk->sk_filter, NULL);
1da177e4
LT		 1127 }
1128
20d49473
PO		 1129 sock_disable_timestamp(sk, SOCK_TIMESTAMP);
1130 sock_disable_timestamp(sk, SOCK_TIMESTAMPING_RX_SOFTWARE);
1da177e4
LT		 1131
1132 if (atomic_read(&sk->sk_omem_alloc))
1133 printk(KERN_DEBUG "%s: optmem leakage (%d bytes) detected.\n",
0dc47877 1134 __func__, atomic_read(&sk->sk_omem_alloc));
1da177e4 1135
3b1e0a65 1136 put_net(sock_net(sk));
c308c1b2 1137 sk_prot_free(sk->sk_prot_creator, sk);
1da177e4 1138}
2b85a34e
ED		 1139
1140void sk_free(struct sock *sk)
1141{
1142 /*
1143 * We substract one from sk_wmem_alloc and can know if
1144 * some packets are still in some tx queue.
1145 * If not null, sock_wfree() will call __sk_free(sk) later
1146 */
1147 if (atomic_dec_and_test(&sk->sk_wmem_alloc))
1148 __sk_free(sk);
1149}
2a91525c 1150EXPORT_SYMBOL(sk_free);
1da177e4 1151
edf02087
DL		 1152/*
1153 * Last sock_put should drop referrence to sk->sk_net. It has already
1154 * been dropped in sk_change_net. Taking referrence to stopping namespace
1155 * is not an option.
1156 * Take referrence to a socket to remove it from hash _alive_ and after that
1157 * destroy it in the context of init_net.
1158 */
1159void sk_release_kernel(struct sock *sk)
1160{
1161 if (sk == NULL || sk->sk_socket == NULL)
1162 return;
1163
1164 sock_hold(sk);
1165 sock_release(sk->sk_socket);
65a18ec5 1166 release_net(sock_net(sk));
3b1e0a65 1167 sock_net_set(sk, get_net(&init_net));
edf02087
DL		 1168 sock_put(sk);
1169}
45af1754 1170EXPORT_SYMBOL(sk_release_kernel);
edf02087 1171
dd0fc66f 1172struct sock *sk_clone(const struct sock *sk, const gfp_t priority)
87d11ceb 1173{
8fd1d178 1174 struct sock *newsk;
87d11ceb 1175
8fd1d178 1176 newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family);
87d11ceb
ACM		 1177 if (newsk != NULL) {
1178 struct sk_filter *filter;
1179
892c141e 1180 sock_copy(newsk, sk);
87d11ceb
ACM		 1181
1182 /* SANITY */
3b1e0a65 1183 get_net(sock_net(newsk));
87d11ceb
ACM		 1184 sk_node_init(&newsk->sk_node);
1185 sock_lock_init(newsk);
1186 bh_lock_sock(newsk);
fa438ccf 1187 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL;
8eae939f 1188 newsk->sk_backlog.len = 0;
87d11ceb
ACM		 1189
1190 atomic_set(&newsk->sk_rmem_alloc, 0);
2b85a34e
ED		 1191 /*
1192 * sk_wmem_alloc set to one (see sk_free() and sock_wfree())
1193 */
1194 atomic_set(&newsk->sk_wmem_alloc, 1);
87d11ceb
ACM		 1195 atomic_set(&newsk->sk_omem_alloc, 0);
1196 skb_queue_head_init(&newsk->sk_receive_queue);
1197 skb_queue_head_init(&newsk->sk_write_queue);
97fc2f08
CL		 1198#ifdef CONFIG_NET_DMA
1199 skb_queue_head_init(&newsk->sk_async_wait_queue);
1200#endif
87d11ceb 1201
b6c6712a 1202 spin_lock_init(&newsk->sk_dst_lock);
87d11ceb 1203 rwlock_init(&newsk->sk_callback_lock);
443aef0e
PZ		 1204 lockdep_set_class_and_name(&newsk->sk_callback_lock,
1205 af_callback_keys + newsk->sk_family,
1206 af_family_clock_key_strings[newsk->sk_family]);
87d11ceb
ACM		 1207
1208 newsk->sk_dst_cache = NULL;
1209 newsk->sk_wmem_queued = 0;
1210 newsk->sk_forward_alloc = 0;
1211 newsk->sk_send_head = NULL;
87d11ceb
ACM		 1212 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
1213
1214 sock_reset_flag(newsk, SOCK_DONE);
1215 skb_queue_head_init(&newsk->sk_error_queue);
1216
1217 filter = newsk->sk_filter;
1218 if (filter != NULL)
1219 sk_filter_charge(newsk, filter);
1220
1221 if (unlikely(xfrm_sk_clone_policy(newsk))) {
1222 /* It is still raw copy of parent, so invalidate
1223 * destructor and make plain sk_free() */
1224 newsk->sk_destruct = NULL;
1225 sk_free(newsk);
1226 newsk = NULL;
1227 goto out;
1228 }
1229
1230 newsk->sk_err = 0;
1231 newsk->sk_priority = 0;
4dc6dc71
ED		 1232 /*
1233 * Before updating sk_refcnt, we must commit prior changes to memory
1234 * (Documentation/RCU/rculist_nulls.txt for details)
1235 */
1236 smp_wmb();
87d11ceb
ACM		 1237 atomic_set(&newsk->sk_refcnt, 2);
1238
1239 /*
1240 * Increment the counter in the same struct proto as the master
1241 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
1242 * is the same as sk->sk_prot->socks, as this field was copied
1243 * with memcpy).
1244 *
1245 * This _changes_ the previous behaviour, where
1246 * tcp_create_openreq_child always was incrementing the
1247 * equivalent to tcp_prot->socks (inet_sock_nr), so this have
1248 * to be taken into account in all callers. -acme
1249 */
1250 sk_refcnt_debug_inc(newsk);
972692e0 1251 sk_set_socket(newsk, NULL);
43815482 1252 newsk->sk_wq = NULL;
87d11ceb
ACM		 1253
1254 if (newsk->sk_prot->sockets_allocated)
1748376b 1255 percpu_counter_inc(newsk->sk_prot->sockets_allocated);
704da560
OP		 1256
1257 if (sock_flag(newsk, SOCK_TIMESTAMP) ||
1258 sock_flag(newsk, SOCK_TIMESTAMPING_RX_SOFTWARE))
1259 net_enable_timestamp();
87d11ceb
ACM		 1260 }
1261out:
1262 return newsk;
1263}
87d11ceb
ACM		 1264EXPORT_SYMBOL_GPL(sk_clone);
1265
9958089a
AK		 1266void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
1267{
1268 __sk_dst_set(sk, dst);
1269 sk->sk_route_caps = dst->dev->features;
1270 if (sk->sk_route_caps & NETIF_F_GSO)
4fcd6b99 1271 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE;
a465419b 1272 sk->sk_route_caps &= ~sk->sk_route_nocaps;
9958089a 1273 if (sk_can_gso(sk)) {
82cc1a7a 1274 if (dst->header_len) {
9958089a 1275 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
82cc1a7a 1276 } else {
9958089a 1277 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
82cc1a7a
PWJ		 1278 sk->sk_gso_max_size = dst->dev->gso_max_size;
1279 }
9958089a
AK		 1280 }
1281}
1282EXPORT_SYMBOL_GPL(sk_setup_caps);
1283
1da177e4
LT		 1284void __init sk_init(void)
1285{
4481374c 1286 if (totalram_pages <= 4096) {
1da177e4
LT		 1287 sysctl_wmem_max = 32767;
1288 sysctl_rmem_max = 32767;
1289 sysctl_wmem_default = 32767;
1290 sysctl_rmem_default = 32767;
4481374c 1291 } else if (totalram_pages >= 131072) {
1da177e4
LT		 1292 sysctl_wmem_max = 131071;
1293 sysctl_rmem_max = 131071;
1294 }
1295}
1296
1297/*
1298 * Simple resource managers for sockets.
1299 */
1300
1301
4ec93edb
YH		 1302/*
1303 * Write buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1304 */
1305void sock_wfree(struct sk_buff *skb)
1306{
1307 struct sock *sk = skb->sk;
d99927f4 1308 unsigned int len = skb->truesize;
1da177e4 1309
d99927f4
ED		 1310 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) {
1311 /*
1312 * Keep a reference on sk_wmem_alloc, this will be released
1313 * after sk_write_space() call
1314 */
1315 atomic_sub(len - 1, &sk->sk_wmem_alloc);
1da177e4 1316 sk->sk_write_space(sk);
d99927f4
ED		 1317 len = 1;
1318 }
2b85a34e 1319 /*
d99927f4
ED		 1320 * if sk_wmem_alloc reaches 0, we must finish what sk_free()
1321 * could not do because of in-flight packets
2b85a34e 1322 */
d99927f4 1323 if (atomic_sub_and_test(len, &sk->sk_wmem_alloc))
2b85a34e 1324 __sk_free(sk);
1da177e4 1325}
2a91525c 1326EXPORT_SYMBOL(sock_wfree);
1da177e4 1327
4ec93edb
YH		 1328/*
1329 * Read buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1330 */
1331void sock_rfree(struct sk_buff *skb)
1332{
1333 struct sock *sk = skb->sk;
1334
1335 atomic_sub(skb->truesize, &sk->sk_rmem_alloc);
3ab224be 1336 sk_mem_uncharge(skb->sk, skb->truesize);
1da177e4 1337}
2a91525c 1338EXPORT_SYMBOL(sock_rfree);
1da177e4
LT		 1339
1340
1341int sock_i_uid(struct sock *sk)
1342{
1343 int uid;
1344
1345 read_lock(&sk->sk_callback_lock);
1346 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : 0;
1347 read_unlock(&sk->sk_callback_lock);
1348 return uid;
1349}
2a91525c 1350EXPORT_SYMBOL(sock_i_uid);
1da177e4
LT		 1351
1352unsigned long sock_i_ino(struct sock *sk)
1353{
1354 unsigned long ino;
1355
1356 read_lock(&sk->sk_callback_lock);
1357 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
1358 read_unlock(&sk->sk_callback_lock);
1359 return ino;
1360}
2a91525c 1361EXPORT_SYMBOL(sock_i_ino);
1da177e4
LT		 1362
1363/*
1364 * Allocate a skb from the socket's send buffer.
1365 */
86a76caf 1366struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
dd0fc66f 1367 gfp_t priority)
1da177e4
LT		 1368{
1369 if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
2a91525c 1370 struct sk_buff *skb = alloc_skb(size, priority);
1da177e4
LT		 1371 if (skb) {
1372 skb_set_owner_w(skb, sk);
1373 return skb;
1374 }
1375 }
1376 return NULL;
1377}
2a91525c 1378EXPORT_SYMBOL(sock_wmalloc);
1da177e4
LT		 1379
1380/*
1381 * Allocate a skb from the socket's receive buffer.
4ec93edb 1382 */
86a76caf 1383struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force,
dd0fc66f 1384 gfp_t priority)
1da177e4
LT		 1385{
1386 if (force || atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) {
1387 struct sk_buff *skb = alloc_skb(size, priority);
1388 if (skb) {
1389 skb_set_owner_r(skb, sk);
1390 return skb;
1391 }
1392 }
1393 return NULL;
1394}
1395
4ec93edb 1396/*
1da177e4 1397 * Allocate a memory block from the socket's option memory buffer.
4ec93edb 1398 */
dd0fc66f 1399void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
1da177e4
LT		 1400{
1401 if ((unsigned)size <= sysctl_optmem_max &&
1402 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) {
1403 void *mem;
1404 /* First do the add, to avoid the race if kmalloc
4ec93edb 1405 * might sleep.
1da177e4
LT		 1406 */
1407 atomic_add(size, &sk->sk_omem_alloc);
1408 mem = kmalloc(size, priority);
1409 if (mem)
1410 return mem;
1411 atomic_sub(size, &sk->sk_omem_alloc);
1412 }
1413 return NULL;
1414}
2a91525c 1415EXPORT_SYMBOL(sock_kmalloc);
1da177e4
LT		 1416
1417/*
1418 * Free an option memory block.
1419 */
1420void sock_kfree_s(struct sock *sk, void *mem, int size)
1421{
1422 kfree(mem);
1423 atomic_sub(size, &sk->sk_omem_alloc);
1424}
2a91525c 1425EXPORT_SYMBOL(sock_kfree_s);
1da177e4
LT		 1426
1427/* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
1428 I think, these locks should be removed for datagram sockets.
1429 */
2a91525c 1430static long sock_wait_for_wmem(struct sock *sk, long timeo)
1da177e4
LT		 1431{
1432 DEFINE_WAIT(wait);
1433
1434 clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1435 for (;;) {
1436 if (!timeo)
1437 break;
1438 if (signal_pending(current))
1439 break;
1440 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
aa395145 1441 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1da177e4
LT		 1442 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf)
1443 break;
1444 if (sk->sk_shutdown & SEND_SHUTDOWN)
1445 break;
1446 if (sk->sk_err)
1447 break;
1448 timeo = schedule_timeout(timeo);
1449 }
aa395145 1450 finish_wait(sk_sleep(sk), &wait);
1da177e4
LT		 1451 return timeo;
1452}
1453
1454
1455/*
1456 * Generic send/receive buffer handlers
1457 */
1458
4cc7f68d
HX		 1459struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len,
1460 unsigned long data_len, int noblock,
1461 int *errcode)
1da177e4
LT		 1462{
1463 struct sk_buff *skb;
7d877f3b 1464 gfp_t gfp_mask;
1da177e4
LT		 1465 long timeo;
1466 int err;
1467
1468 gfp_mask = sk->sk_allocation;
1469 if (gfp_mask & __GFP_WAIT)
1470 gfp_mask |= __GFP_REPEAT;
1471
1472 timeo = sock_sndtimeo(sk, noblock);
1473 while (1) {
1474 err = sock_error(sk);
1475 if (err != 0)
1476 goto failure;
1477
1478 err = -EPIPE;
1479 if (sk->sk_shutdown & SEND_SHUTDOWN)
1480 goto failure;
1481
1482 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
db38c179 1483 skb = alloc_skb(header_len, gfp_mask);
1da177e4
LT		 1484 if (skb) {
1485 int npages;
1486 int i;
1487
1488 /* No pages, we're done... */
1489 if (!data_len)
1490 break;
1491
1492 npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
1493 skb->truesize += data_len;
1494 skb_shinfo(skb)->nr_frags = npages;
1495 for (i = 0; i < npages; i++) {
1496 struct page *page;
1497 skb_frag_t *frag;
1498
1499 page = alloc_pages(sk->sk_allocation, 0);
1500 if (!page) {
1501 err = -ENOBUFS;
1502 skb_shinfo(skb)->nr_frags = i;
1503 kfree_skb(skb);
1504 goto failure;
1505 }
1506
1507 frag = &skb_shinfo(skb)->frags[i];
1508 frag->page = page;
1509 frag->page_offset = 0;
1510 frag->size = (data_len >= PAGE_SIZE ?
1511 PAGE_SIZE :
1512 data_len);
1513 data_len -= PAGE_SIZE;
1514 }
1515
1516 /* Full success... */
1517 break;
1518 }
1519 err = -ENOBUFS;
1520 goto failure;
1521 }
1522 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1523 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1524 err = -EAGAIN;
1525 if (!timeo)
1526 goto failure;
1527 if (signal_pending(current))
1528 goto interrupted;
1529 timeo = sock_wait_for_wmem(sk, timeo);
1530 }
1531
1532 skb_set_owner_w(skb, sk);
1533 return skb;
1534
1535interrupted:
1536 err = sock_intr_errno(timeo);
1537failure:
1538 *errcode = err;
1539 return NULL;
1540}
4cc7f68d 1541EXPORT_SYMBOL(sock_alloc_send_pskb);
1da177e4 1542
4ec93edb 1543struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
1da177e4
LT		 1544 int noblock, int *errcode)
1545{
1546 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode);
1547}
2a91525c 1548EXPORT_SYMBOL(sock_alloc_send_skb);
1da177e4
LT		 1549
1550static void __lock_sock(struct sock *sk)
1551{
1552 DEFINE_WAIT(wait);
1553
e71a4783 1554 for (;;) {
1da177e4
LT		 1555 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
1556 TASK_UNINTERRUPTIBLE);
1557 spin_unlock_bh(&sk->sk_lock.slock);
1558 schedule();
1559 spin_lock_bh(&sk->sk_lock.slock);
e71a4783 1560 if (!sock_owned_by_user(sk))
1da177e4
LT		 1561 break;
1562 }
1563 finish_wait(&sk->sk_lock.wq, &wait);
1564}
1565
1566static void __release_sock(struct sock *sk)
1567{
1568 struct sk_buff *skb = sk->sk_backlog.head;
1569
1570 do {
1571 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
1572 bh_unlock_sock(sk);
1573
1574 do {
1575 struct sk_buff *next = skb->next;
1576
7fee226a 1577 WARN_ON_ONCE(skb_dst_is_noref(skb));
1da177e4 1578 skb->next = NULL;
c57943a1 1579 sk_backlog_rcv(sk, skb);
1da177e4
LT		 1580
1581 /*
1582 * We are in process context here with softirqs
1583 * disabled, use cond_resched_softirq() to preempt.
1584 * This is safe to do because we've taken the backlog
1585 * queue private:
1586 */
1587 cond_resched_softirq();
1588
1589 skb = next;
1590 } while (skb != NULL);
1591
1592 bh_lock_sock(sk);
e71a4783 1593 } while ((skb = sk->sk_backlog.head) != NULL);
8eae939f
ZY		 1594
1595 /*
1596 * Doing the zeroing here guarantee we can not loop forever
1597 * while a wild producer attempts to flood us.
1598 */
1599 sk->sk_backlog.len = 0;
1da177e4
LT		 1600}
1601
1602/**
1603 * sk_wait_data - wait for data to arrive at sk_receive_queue
4dc3b16b
PP		 1604 * @sk: sock to wait on
1605 * @timeo: for how long
1da177e4
LT		 1606 *
1607 * Now socket state including sk->sk_err is changed only under lock,
1608 * hence we may omit checks after joining wait queue.
1609 * We check receive queue before schedule() only as optimization;
1610 * it is very likely that release_sock() added new data.
1611 */
1612int sk_wait_data(struct sock *sk, long *timeo)
1613{
1614 int rc;
1615 DEFINE_WAIT(wait);
1616
aa395145 1617 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1da177e4
LT		 1618 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1619 rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue));
1620 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
aa395145 1621 finish_wait(sk_sleep(sk), &wait);
1da177e4
LT		 1622 return rc;
1623}
1da177e4
LT		 1624EXPORT_SYMBOL(sk_wait_data);
1625
3ab224be
HA		 1626/**
1627 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated
1628 * @sk: socket
1629 * @size: memory size to allocate
1630 * @kind: allocation type
1631 *
1632 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means
1633 * rmem allocation. This function assumes that protocols which have
1634 * memory_pressure use sk_wmem_queued as write buffer accounting.
1635 */
1636int __sk_mem_schedule(struct sock *sk, int size, int kind)
1637{
1638 struct proto *prot = sk->sk_prot;
1639 int amt = sk_mem_pages(size);
1640 int allocated;
1641
1642 sk->sk_forward_alloc += amt * SK_MEM_QUANTUM;
1643 allocated = atomic_add_return(amt, prot->memory_allocated);
1644
1645 /* Under limit. */
1646 if (allocated <= prot->sysctl_mem[0]) {
1647 if (prot->memory_pressure && *prot->memory_pressure)
1648 *prot->memory_pressure = 0;
1649 return 1;
1650 }
1651
1652 /* Under pressure. */
1653 if (allocated > prot->sysctl_mem[1])
1654 if (prot->enter_memory_pressure)
5c52ba17 1655 prot->enter_memory_pressure(sk);
3ab224be
HA		 1656
1657 /* Over hard limit. */
1658 if (allocated > prot->sysctl_mem[2])
1659 goto suppress_allocation;
1660
1661 /* guarantee minimum buffer size under pressure */
1662 if (kind == SK_MEM_RECV) {
1663 if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0])
1664 return 1;
1665 } else { /* SK_MEM_SEND */
1666 if (sk->sk_type == SOCK_STREAM) {
1667 if (sk->sk_wmem_queued < prot->sysctl_wmem[0])
1668 return 1;
1669 } else if (atomic_read(&sk->sk_wmem_alloc) <
1670 prot->sysctl_wmem[0])
1671 return 1;
1672 }
1673
1674 if (prot->memory_pressure) {
1748376b
ED		 1675 int alloc;
1676
1677 if (!*prot->memory_pressure)
1678 return 1;
1679 alloc = percpu_counter_read_positive(prot->sockets_allocated);
1680 if (prot->sysctl_mem[2] > alloc *
3ab224be
HA		 1681 sk_mem_pages(sk->sk_wmem_queued +
1682 atomic_read(&sk->sk_rmem_alloc) +
1683 sk->sk_forward_alloc))
1684 return 1;
1685 }
1686
1687suppress_allocation:
1688
1689 if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) {
1690 sk_stream_moderate_sndbuf(sk);
1691
1692 /* Fail only if socket is _under_ its sndbuf.
1693 * In this case we cannot block, so that we have to fail.
1694 */
1695 if (sk->sk_wmem_queued + size >= sk->sk_sndbuf)
1696 return 1;
1697 }
1698
1699 /* Alas. Undo changes. */
1700 sk->sk_forward_alloc -= amt * SK_MEM_QUANTUM;
1701 atomic_sub(amt, prot->memory_allocated);
1702 return 0;
1703}
3ab224be
HA		 1704EXPORT_SYMBOL(__sk_mem_schedule);
1705
1706/**
1707 * __sk_reclaim - reclaim memory_allocated
1708 * @sk: socket
1709 */
1710void __sk_mem_reclaim(struct sock *sk)
1711{
1712 struct proto *prot = sk->sk_prot;
1713
680a5a50 1714 atomic_sub(sk->sk_forward_alloc >> SK_MEM_QUANTUM_SHIFT,
3ab224be
HA		 1715 prot->memory_allocated);
1716 sk->sk_forward_alloc &= SK_MEM_QUANTUM - 1;
1717
1718 if (prot->memory_pressure && *prot->memory_pressure &&
1719 (atomic_read(prot->memory_allocated) < prot->sysctl_mem[0]))
1720 *prot->memory_pressure = 0;
1721}
3ab224be
HA		 1722EXPORT_SYMBOL(__sk_mem_reclaim);
1723
1724
1da177e4
LT		 1725/*
1726 * Set of default routines for initialising struct proto_ops when
1727 * the protocol does not support a particular function. In certain
1728 * cases where it makes no sense for a protocol to have a "do nothing"
1729 * function, some default processing is provided.
1730 */
1731
1732int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
1733{
1734 return -EOPNOTSUPP;
1735}
2a91525c 1736EXPORT_SYMBOL(sock_no_bind);
1da177e4 1737
4ec93edb 1738int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 1739 int len, int flags)
1740{
1741 return -EOPNOTSUPP;
1742}
2a91525c 1743EXPORT_SYMBOL(sock_no_connect);
1da177e4
LT		 1744
1745int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
1746{
1747 return -EOPNOTSUPP;
1748}
2a91525c 1749EXPORT_SYMBOL(sock_no_socketpair);
1da177e4
LT		 1750
1751int sock_no_accept(struct socket *sock, struct socket *newsock, int flags)
1752{
1753 return -EOPNOTSUPP;
1754}
2a91525c 1755EXPORT_SYMBOL(sock_no_accept);
1da177e4 1756
4ec93edb 1757int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 1758 int *len, int peer)
1759{
1760 return -EOPNOTSUPP;
1761}
2a91525c 1762EXPORT_SYMBOL(sock_no_getname);
1da177e4 1763
2a91525c 1764unsigned int sock_no_poll(struct file *file, struct socket *sock, poll_table *pt)
1da177e4
LT		 1765{
1766 return 0;
1767}
2a91525c 1768EXPORT_SYMBOL(sock_no_poll);
1da177e4
LT		 1769
1770int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1771{
1772 return -EOPNOTSUPP;
1773}
2a91525c 1774EXPORT_SYMBOL(sock_no_ioctl);
1da177e4
LT		 1775
1776int sock_no_listen(struct socket *sock, int backlog)
1777{
1778 return -EOPNOTSUPP;
1779}
2a91525c 1780EXPORT_SYMBOL(sock_no_listen);
1da177e4
LT		 1781
1782int sock_no_shutdown(struct socket *sock, int how)
1783{
1784 return -EOPNOTSUPP;
1785}
2a91525c 1786EXPORT_SYMBOL(sock_no_shutdown);
1da177e4
LT		 1787
1788int sock_no_setsockopt(struct socket *sock, int level, int optname,
b7058842 1789 char __user *optval, unsigned int optlen)
1da177e4
LT		 1790{
1791 return -EOPNOTSUPP;
1792}
2a91525c 1793EXPORT_SYMBOL(sock_no_setsockopt);
1da177e4
LT		 1794
1795int sock_no_getsockopt(struct socket *sock, int level, int optname,
1796 char __user *optval, int __user *optlen)
1797{
1798 return -EOPNOTSUPP;
1799}
2a91525c 1800EXPORT_SYMBOL(sock_no_getsockopt);
1da177e4
LT		 1801
1802int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
1803 size_t len)
1804{
1805 return -EOPNOTSUPP;
1806}
2a91525c 1807EXPORT_SYMBOL(sock_no_sendmsg);
1da177e4
LT		 1808
1809int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
1810 size_t len, int flags)
1811{
1812 return -EOPNOTSUPP;
1813}
2a91525c 1814EXPORT_SYMBOL(sock_no_recvmsg);
1da177e4
LT		 1815
1816int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
1817{
1818 /* Mirror missing mmap method error code */
1819 return -ENODEV;
1820}
2a91525c 1821EXPORT_SYMBOL(sock_no_mmap);
1da177e4
LT		 1822
1823ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
1824{
1825 ssize_t res;
1826 struct msghdr msg = {.msg_flags = flags};
1827 struct kvec iov;
1828 char *kaddr = kmap(page);
1829 iov.iov_base = kaddr + offset;
1830 iov.iov_len = size;
1831 res = kernel_sendmsg(sock, &msg, &iov, 1, size);
1832 kunmap(page);
1833 return res;
1834}
2a91525c 1835EXPORT_SYMBOL(sock_no_sendpage);
1da177e4
LT		 1836
1837/*
1838 * Default Socket Callbacks
1839 */
1840
1841static void sock_def_wakeup(struct sock *sk)
1842{
43815482
ED		 1843 struct socket_wq *wq;
1844
1845 rcu_read_lock();
1846 wq = rcu_dereference(sk->sk_wq);
1847 if (wq_has_sleeper(wq))
1848 wake_up_interruptible_all(&wq->wait);
1849 rcu_read_unlock();
1da177e4
LT		 1850}
1851
1852static void sock_def_error_report(struct sock *sk)
1853{
43815482
ED		 1854 struct socket_wq *wq;
1855
1856 rcu_read_lock();
1857 wq = rcu_dereference(sk->sk_wq);
1858 if (wq_has_sleeper(wq))
1859 wake_up_interruptible_poll(&wq->wait, POLLERR);
8d8ad9d7 1860 sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR);
43815482 1861 rcu_read_unlock();
1da177e4
LT		 1862}
1863
1864static void sock_def_readable(struct sock *sk, int len)
1865{
43815482
ED		 1866 struct socket_wq *wq;
1867
1868 rcu_read_lock();
1869 wq = rcu_dereference(sk->sk_wq);
1870 if (wq_has_sleeper(wq))
1871 wake_up_interruptible_sync_poll(&wq->wait, POLLIN |
37e5540b 1872 POLLRDNORM | POLLRDBAND);
8d8ad9d7 1873 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
43815482 1874 rcu_read_unlock();
1da177e4
LT		 1875}
1876
1877static void sock_def_write_space(struct sock *sk)
1878{
43815482
ED		 1879 struct socket_wq *wq;
1880
1881 rcu_read_lock();
1da177e4
LT		 1882
1883 /* Do not wake up a writer until he can make "significant"
1884 * progress. --DaveM
1885 */
e71a4783 1886 if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) {
43815482
ED		 1887 wq = rcu_dereference(sk->sk_wq);
1888 if (wq_has_sleeper(wq))
1889 wake_up_interruptible_sync_poll(&wq->wait, POLLOUT |
37e5540b 1890 POLLWRNORM | POLLWRBAND);
1da177e4
LT		 1891
1892 /* Should agree with poll, otherwise some programs break */
1893 if (sock_writeable(sk))
8d8ad9d7 1894 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
1da177e4
LT		 1895 }
1896
43815482 1897 rcu_read_unlock();
1da177e4
LT		 1898}
1899
1900static void sock_def_destruct(struct sock *sk)
1901{
a51482bd 1902 kfree(sk->sk_protinfo);
1da177e4
LT		 1903}
1904
1905void sk_send_sigurg(struct sock *sk)
1906{
1907 if (sk->sk_socket && sk->sk_socket->file)
1908 if (send_sigurg(&sk->sk_socket->file->f_owner))
8d8ad9d7 1909 sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI);
1da177e4 1910}
2a91525c 1911EXPORT_SYMBOL(sk_send_sigurg);
1da177e4
LT		 1912
1913void sk_reset_timer(struct sock *sk, struct timer_list* timer,
1914 unsigned long expires)
1915{
1916 if (!mod_timer(timer, expires))
1917 sock_hold(sk);
1918}
1da177e4
LT		 1919EXPORT_SYMBOL(sk_reset_timer);
1920
1921void sk_stop_timer(struct sock *sk, struct timer_list* timer)
1922{
1923 if (timer_pending(timer) && del_timer(timer))
1924 __sock_put(sk);
1925}
1da177e4
LT		 1926EXPORT_SYMBOL(sk_stop_timer);
1927
1928void sock_init_data(struct socket *sock, struct sock *sk)
1929{
1930 skb_queue_head_init(&sk->sk_receive_queue);
1931 skb_queue_head_init(&sk->sk_write_queue);
1932 skb_queue_head_init(&sk->sk_error_queue);
97fc2f08
CL		 1933#ifdef CONFIG_NET_DMA
1934 skb_queue_head_init(&sk->sk_async_wait_queue);
1935#endif
1da177e4
LT		 1936
1937 sk->sk_send_head = NULL;
1938
1939 init_timer(&sk->sk_timer);
4ec93edb 1940
1da177e4
LT		 1941 sk->sk_allocation = GFP_KERNEL;
1942 sk->sk_rcvbuf = sysctl_rmem_default;
1943 sk->sk_sndbuf = sysctl_wmem_default;
1944 sk->sk_state = TCP_CLOSE;
972692e0 1945 sk_set_socket(sk, sock);
1da177e4
LT		 1946
1947 sock_set_flag(sk, SOCK_ZAPPED);
1948
e71a4783 1949 if (sock) {
1da177e4 1950 sk->sk_type = sock->type;
43815482 1951 sk->sk_wq = sock->wq;
1da177e4
LT		 1952 sock->sk = sk;
1953 } else
43815482 1954 sk->sk_wq = NULL;
1da177e4 1955
b6c6712a 1956 spin_lock_init(&sk->sk_dst_lock);
1da177e4 1957 rwlock_init(&sk->sk_callback_lock);
443aef0e
PZ		 1958 lockdep_set_class_and_name(&sk->sk_callback_lock,
1959 af_callback_keys + sk->sk_family,
1960 af_family_clock_key_strings[sk->sk_family]);
1da177e4
LT		 1961
1962 sk->sk_state_change = sock_def_wakeup;
1963 sk->sk_data_ready = sock_def_readable;
1964 sk->sk_write_space = sock_def_write_space;
1965 sk->sk_error_report = sock_def_error_report;
1966 sk->sk_destruct = sock_def_destruct;
1967
1968 sk->sk_sndmsg_page = NULL;
1969 sk->sk_sndmsg_off = 0;
1970
1971 sk->sk_peercred.pid = 0;
1972 sk->sk_peercred.uid = -1;
1973 sk->sk_peercred.gid = -1;
1974 sk->sk_write_pending = 0;
1975 sk->sk_rcvlowat = 1;
1976 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
1977 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
1978
f37f0afb 1979 sk->sk_stamp = ktime_set(-1L, 0);
1da177e4 1980
4dc6dc71
ED		 1981 /*
1982 * Before updating sk_refcnt, we must commit prior changes to memory
1983 * (Documentation/RCU/rculist_nulls.txt for details)
1984 */
1985 smp_wmb();
1da177e4 1986 atomic_set(&sk->sk_refcnt, 1);
33c732c3 1987 atomic_set(&sk->sk_drops, 0);
1da177e4 1988}
2a91525c 1989EXPORT_SYMBOL(sock_init_data);
1da177e4 1990
b5606c2d 1991void lock_sock_nested(struct sock *sk, int subclass)
1da177e4
LT		 1992{
1993 might_sleep();
a5b5bb9a 1994 spin_lock_bh(&sk->sk_lock.slock);
d2e9117c 1995 if (sk->sk_lock.owned)
1da177e4 1996 __lock_sock(sk);
d2e9117c 1997 sk->sk_lock.owned = 1;
a5b5bb9a
IM		 1998 spin_unlock(&sk->sk_lock.slock);
1999 /*
2000 * The sk_lock has mutex_lock() semantics here:
2001 */
fcc70d5f 2002 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
a5b5bb9a 2003 local_bh_enable();
1da177e4 2004}
fcc70d5f 2005EXPORT_SYMBOL(lock_sock_nested);
1da177e4 2006
b5606c2d 2007void release_sock(struct sock *sk)
1da177e4 2008{
a5b5bb9a
IM		 2009 /*
2010 * The sk_lock has mutex_unlock() semantics:
2011 */
2012 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
2013
2014 spin_lock_bh(&sk->sk_lock.slock);
1da177e4
LT		 2015 if (sk->sk_backlog.tail)
2016 __release_sock(sk);
d2e9117c 2017 sk->sk_lock.owned = 0;
a5b5bb9a
IM		 2018 if (waitqueue_active(&sk->sk_lock.wq))
2019 wake_up(&sk->sk_lock.wq);
2020 spin_unlock_bh(&sk->sk_lock.slock);
1da177e4
LT		 2021}
2022EXPORT_SYMBOL(release_sock);
2023
8a74ad60
ED		 2024/**
2025 * lock_sock_fast - fast version of lock_sock
2026 * @sk: socket
2027 *
2028 * This version should be used for very small section, where process wont block
2029 * return false if fast path is taken
2030 * sk_lock.slock locked, owned = 0, BH disabled
2031 * return true if slow path is taken
2032 * sk_lock.slock unlocked, owned = 1, BH enabled
2033 */
2034bool lock_sock_fast(struct sock *sk)
2035{
2036 might_sleep();
2037 spin_lock_bh(&sk->sk_lock.slock);
2038
2039 if (!sk->sk_lock.owned)
2040 /*
2041 * Note : We must disable BH
2042 */
2043 return false;
2044
2045 __lock_sock(sk);
2046 sk->sk_lock.owned = 1;
2047 spin_unlock(&sk->sk_lock.slock);
2048 /*
2049 * The sk_lock has mutex_lock() semantics here:
2050 */
2051 mutex_acquire(&sk->sk_lock.dep_map, 0, 0, _RET_IP_);
2052 local_bh_enable();
2053 return true;
2054}
2055EXPORT_SYMBOL(lock_sock_fast);
2056
1da177e4 2057int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
4ec93edb 2058{
b7aa0bf7 2059 struct timeval tv;
1da177e4 2060 if (!sock_flag(sk, SOCK_TIMESTAMP))
20d49473 2061 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
b7aa0bf7
ED		 2062 tv = ktime_to_timeval(sk->sk_stamp);
2063 if (tv.tv_sec == -1)
1da177e4 2064 return -ENOENT;
b7aa0bf7
ED		 2065 if (tv.tv_sec == 0) {
2066 sk->sk_stamp = ktime_get_real();
2067 tv = ktime_to_timeval(sk->sk_stamp);
2068 }
2069 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0;
4ec93edb 2070}
1da177e4
LT		 2071EXPORT_SYMBOL(sock_get_timestamp);
2072
ae40eb1e
ED		 2073int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
2074{
2075 struct timespec ts;
2076 if (!sock_flag(sk, SOCK_TIMESTAMP))
20d49473 2077 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
ae40eb1e
ED		 2078 ts = ktime_to_timespec(sk->sk_stamp);
2079 if (ts.tv_sec == -1)
2080 return -ENOENT;
2081 if (ts.tv_sec == 0) {
2082 sk->sk_stamp = ktime_get_real();
2083 ts = ktime_to_timespec(sk->sk_stamp);
2084 }
2085 return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0;
2086}
2087EXPORT_SYMBOL(sock_get_timestampns);
2088
20d49473 2089void sock_enable_timestamp(struct sock *sk, int flag)
4ec93edb 2090{
20d49473
PO		 2091 if (!sock_flag(sk, flag)) {
2092 sock_set_flag(sk, flag);
2093 /*
2094 * we just set one of the two flags which require net
2095 * time stamping, but time stamping might have been on
2096 * already because of the other one
2097 */
2098 if (!sock_flag(sk,
2099 flag == SOCK_TIMESTAMP ?
2100 SOCK_TIMESTAMPING_RX_SOFTWARE :
2101 SOCK_TIMESTAMP))
2102 net_enable_timestamp();
1da177e4
LT		 2103 }
2104}
1da177e4
LT		 2105
2106/*
2107 * Get a socket option on an socket.
2108 *
2109 * FIX: POSIX 1003.1g is very ambiguous here. It states that
2110 * asynchronous errors should be reported by getsockopt. We assume
2111 * this means if you specify SO_ERROR (otherwise whats the point of it).
2112 */
2113int sock_common_getsockopt(struct socket *sock, int level, int optname,
2114 char __user *optval, int __user *optlen)
2115{
2116 struct sock *sk = sock->sk;
2117
2118 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2119}
1da177e4
LT		 2120EXPORT_SYMBOL(sock_common_getsockopt);
2121
3fdadf7d 2122#ifdef CONFIG_COMPAT
543d9cfe
ACM		 2123int compat_sock_common_getsockopt(struct socket *sock, int level, int optname,
2124 char __user *optval, int __user *optlen)
3fdadf7d
DM		 2125{
2126 struct sock *sk = sock->sk;
2127
1e51f951 2128 if (sk->sk_prot->compat_getsockopt != NULL)
543d9cfe
ACM		 2129 return sk->sk_prot->compat_getsockopt(sk, level, optname,
2130 optval, optlen);
3fdadf7d
DM		 2131 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2132}
2133EXPORT_SYMBOL(compat_sock_common_getsockopt);
2134#endif
2135
1da177e4
LT		 2136int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock,
2137 struct msghdr *msg, size_t size, int flags)
2138{
2139 struct sock *sk = sock->sk;
2140 int addr_len = 0;
2141 int err;
2142
2143 err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT,
2144 flags & ~MSG_DONTWAIT, &addr_len);
2145 if (err >= 0)
2146 msg->msg_namelen = addr_len;
2147 return err;
2148}
1da177e4
LT		 2149EXPORT_SYMBOL(sock_common_recvmsg);
2150
2151/*
2152 * Set socket options on an inet socket.
2153 */
2154int sock_common_setsockopt(struct socket *sock, int level, int optname,
b7058842 2155 char __user *optval, unsigned int optlen)
1da177e4
LT		 2156{
2157 struct sock *sk = sock->sk;
2158
2159 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2160}
1da177e4
LT		 2161EXPORT_SYMBOL(sock_common_setsockopt);
2162
3fdadf7d 2163#ifdef CONFIG_COMPAT
543d9cfe 2164int compat_sock_common_setsockopt(struct socket *sock, int level, int optname,
b7058842 2165 char __user *optval, unsigned int optlen)
3fdadf7d
DM		 2166{
2167 struct sock *sk = sock->sk;
2168
543d9cfe
ACM		 2169 if (sk->sk_prot->compat_setsockopt != NULL)
2170 return sk->sk_prot->compat_setsockopt(sk, level, optname,
2171 optval, optlen);
3fdadf7d
DM		 2172 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2173}
2174EXPORT_SYMBOL(compat_sock_common_setsockopt);
2175#endif
2176
1da177e4
LT		 2177void sk_common_release(struct sock *sk)
2178{
2179 if (sk->sk_prot->destroy)
2180 sk->sk_prot->destroy(sk);
2181
2182 /*
2183 * Observation: when sock_common_release is called, processes have
2184 * no access to socket. But net still has.
2185 * Step one, detach it from networking:
2186 *
2187 * A. Remove from hash tables.
2188 */
2189
2190 sk->sk_prot->unhash(sk);
2191
2192 /*
2193 * In this point socket cannot receive new packets, but it is possible
2194 * that some packets are in flight because some CPU runs receiver and
2195 * did hash table lookup before we unhashed socket. They will achieve
2196 * receive queue and will be purged by socket destructor.
2197 *
2198 * Also we still have packets pending on receive queue and probably,
2199 * our own packets waiting in device queues. sock_destroy will drain
2200 * receive queue, but transmitted packets will delay socket destruction
2201 * until the last reference will be released.
2202 */
2203
2204 sock_orphan(sk);
2205
2206 xfrm_sk_free_policy(sk);
2207
e6848976 2208 sk_refcnt_debug_release(sk);
1da177e4
LT		 2209 sock_put(sk);
2210}
1da177e4
LT		 2211EXPORT_SYMBOL(sk_common_release);
2212
2213static DEFINE_RWLOCK(proto_list_lock);
2214static LIST_HEAD(proto_list);
2215
13ff3d6f
PE		 2216#ifdef CONFIG_PROC_FS
2217#define PROTO_INUSE_NR 64 /* should be enough for the first time */
1338d466
PE		 2218struct prot_inuse {
2219 int val[PROTO_INUSE_NR];
2220};
13ff3d6f
PE		 2221
2222static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR);
70ee1159
PE		 2223
2224#ifdef CONFIG_NET_NS
2225void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
2226{
2227 int cpu = smp_processor_id();
2228 per_cpu_ptr(net->core.inuse, cpu)->val[prot->inuse_idx] += val;
2229}
2230EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2231
2232int sock_prot_inuse_get(struct net *net, struct proto *prot)
2233{
2234 int cpu, idx = prot->inuse_idx;
2235 int res = 0;
2236
2237 for_each_possible_cpu(cpu)
2238 res += per_cpu_ptr(net->core.inuse, cpu)->val[idx];
2239
2240 return res >= 0 ? res : 0;
2241}
2242EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
2243
2c8c1e72 2244static int __net_init sock_inuse_init_net(struct net *net)
70ee1159
PE		 2245{
2246 net->core.inuse = alloc_percpu(struct prot_inuse);
2247 return net->core.inuse ? 0 : -ENOMEM;
2248}
2249
2c8c1e72 2250static void __net_exit sock_inuse_exit_net(struct net *net)
70ee1159
PE		 2251{
2252 free_percpu(net->core.inuse);
2253}
2254
2255static struct pernet_operations net_inuse_ops = {
2256 .init = sock_inuse_init_net,
2257 .exit = sock_inuse_exit_net,
2258};
2259
2260static __init int net_inuse_init(void)
2261{
2262 if (register_pernet_subsys(&net_inuse_ops))
2263 panic("Cannot initialize net inuse counters");
2264
2265 return 0;
2266}
2267
2268core_initcall(net_inuse_init);
2269#else
1338d466
PE		 2270static DEFINE_PER_CPU(struct prot_inuse, prot_inuse);
2271
c29a0bc4 2272void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
1338d466
PE		 2273{
2274 __get_cpu_var(prot_inuse).val[prot->inuse_idx] += val;
2275}
2276EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2277
c29a0bc4 2278int sock_prot_inuse_get(struct net *net, struct proto *prot)
1338d466
PE		 2279{
2280 int cpu, idx = prot->inuse_idx;
2281 int res = 0;
2282
2283 for_each_possible_cpu(cpu)
2284 res += per_cpu(prot_inuse, cpu).val[idx];
2285
2286 return res >= 0 ? res : 0;
2287}
2288EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
70ee1159 2289#endif
13ff3d6f
PE		 2290
2291static void assign_proto_idx(struct proto *prot)
2292{
2293 prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR);
2294
2295 if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) {
2296 printk(KERN_ERR "PROTO_INUSE_NR exhausted\n");
2297 return;
2298 }
2299
2300 set_bit(prot->inuse_idx, proto_inuse_idx);
2301}
2302
2303static void release_proto_idx(struct proto *prot)
2304{
2305 if (prot->inuse_idx != PROTO_INUSE_NR - 1)
2306 clear_bit(prot->inuse_idx, proto_inuse_idx);
2307}
2308#else
2309static inline void assign_proto_idx(struct proto *prot)
2310{
2311}
2312
2313static inline void release_proto_idx(struct proto *prot)
2314{
2315}
2316#endif
2317
b733c007
PE		 2318int proto_register(struct proto *prot, int alloc_slab)
2319{
1da177e4
LT		 2320 if (alloc_slab) {
2321 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0,
271b72c7
ED		 2322 SLAB_HWCACHE_ALIGN | prot->slab_flags,
2323 NULL);
1da177e4
LT		 2324
2325 if (prot->slab == NULL) {
2326 printk(KERN_CRIT "%s: Can't create sock SLAB cache!\n",
2327 prot->name);
60e7663d 2328 goto out;
1da177e4 2329 }
2e6599cb
ACM		 2330
2331 if (prot->rsk_prot != NULL) {
faf23422 2332 prot->rsk_prot->slab_name = kasprintf(GFP_KERNEL, "request_sock_%s", prot->name);
7e56b5d6 2333 if (prot->rsk_prot->slab_name == NULL)
2e6599cb
ACM		 2334 goto out_free_sock_slab;
2335
7e56b5d6 2336 prot->rsk_prot->slab = kmem_cache_create(prot->rsk_prot->slab_name,
2e6599cb 2337 prot->rsk_prot->obj_size, 0,
20c2df83 2338 SLAB_HWCACHE_ALIGN, NULL);
2e6599cb
ACM		 2339
2340 if (prot->rsk_prot->slab == NULL) {
2341 printk(KERN_CRIT "%s: Can't create request sock SLAB cache!\n",
2342 prot->name);
2343 goto out_free_request_sock_slab_name;
2344 }
2345 }
8feaf0c0 2346
6d6ee43e 2347 if (prot->twsk_prot != NULL) {
faf23422 2348 prot->twsk_prot->twsk_slab_name = kasprintf(GFP_KERNEL, "tw_sock_%s", prot->name);
8feaf0c0 2349
7e56b5d6 2350 if (prot->twsk_prot->twsk_slab_name == NULL)
8feaf0c0
ACM		 2351 goto out_free_request_sock_slab;
2352
6d6ee43e 2353 prot->twsk_prot->twsk_slab =
7e56b5d6 2354 kmem_cache_create(prot->twsk_prot->twsk_slab_name,
6d6ee43e 2355 prot->twsk_prot->twsk_obj_size,
3ab5aee7
ED		 2356 0,
2357 SLAB_HWCACHE_ALIGN |
2358 prot->slab_flags,
20c2df83 2359 NULL);
6d6ee43e 2360 if (prot->twsk_prot->twsk_slab == NULL)
8feaf0c0
ACM		 2361 goto out_free_timewait_sock_slab_name;
2362 }
1da177e4
LT		 2363 }
2364
2a278051 2365 write_lock(&proto_list_lock);
1da177e4 2366 list_add(&prot->node, &proto_list);
13ff3d6f 2367 assign_proto_idx(prot);
1da177e4 2368 write_unlock(&proto_list_lock);
b733c007
PE		 2369 return 0;
2370
8feaf0c0 2371out_free_timewait_sock_slab_name:
7e56b5d6 2372 kfree(prot->twsk_prot->twsk_slab_name);
8feaf0c0
ACM		 2373out_free_request_sock_slab:
2374 if (prot->rsk_prot && prot->rsk_prot->slab) {
2375 kmem_cache_destroy(prot->rsk_prot->slab);
2376 prot->rsk_prot->slab = NULL;
2377 }
2e6599cb 2378out_free_request_sock_slab_name:
72150e9b
DC		 2379 if (prot->rsk_prot)
2380 kfree(prot->rsk_prot->slab_name);
2e6599cb
ACM		 2381out_free_sock_slab:
2382 kmem_cache_destroy(prot->slab);
2383 prot->slab = NULL;
b733c007
PE		 2384out:
2385 return -ENOBUFS;
1da177e4 2386}
1da177e4
LT		 2387EXPORT_SYMBOL(proto_register);
2388
2389void proto_unregister(struct proto *prot)
2390{
2391 write_lock(&proto_list_lock);
13ff3d6f 2392 release_proto_idx(prot);
0a3f4358
PM		 2393 list_del(&prot->node);
2394 write_unlock(&proto_list_lock);
1da177e4
LT		 2395
2396 if (prot->slab != NULL) {
2397 kmem_cache_destroy(prot->slab);
2398 prot->slab = NULL;
2399 }
2400
2e6599cb 2401 if (prot->rsk_prot != NULL && prot->rsk_prot->slab != NULL) {
2e6599cb 2402 kmem_cache_destroy(prot->rsk_prot->slab);
7e56b5d6 2403 kfree(prot->rsk_prot->slab_name);
2e6599cb
ACM		 2404 prot->rsk_prot->slab = NULL;
2405 }
2406
6d6ee43e 2407 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) {
6d6ee43e 2408 kmem_cache_destroy(prot->twsk_prot->twsk_slab);
7e56b5d6 2409 kfree(prot->twsk_prot->twsk_slab_name);
6d6ee43e 2410 prot->twsk_prot->twsk_slab = NULL;
8feaf0c0 2411 }
1da177e4 2412}
1da177e4
LT		 2413EXPORT_SYMBOL(proto_unregister);
2414
2415#ifdef CONFIG_PROC_FS
1da177e4 2416static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
9a429c49 2417 __acquires(proto_list_lock)
1da177e4
LT		 2418{
2419 read_lock(&proto_list_lock);
60f0438a 2420 return seq_list_start_head(&proto_list, *pos);
1da177e4
LT		 2421}
2422
2423static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2424{
60f0438a 2425 return seq_list_next(v, &proto_list, pos);
1da177e4
LT		 2426}
2427
2428static void proto_seq_stop(struct seq_file *seq, void *v)
9a429c49 2429 __releases(proto_list_lock)
1da177e4
LT		 2430{
2431 read_unlock(&proto_list_lock);
2432}
2433
2434static char proto_method_implemented(const void *method)
2435{
2436 return method == NULL ? 'n' : 'y';
2437}
2438
2439static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
2440{
2441 seq_printf(seq, "%-9s %4u %6d %6d %-3s %6u %-3s %-10s "
2442 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
2443 proto->name,
2444 proto->obj_size,
14e943db 2445 sock_prot_inuse_get(seq_file_net(seq), proto),
1da177e4
LT		 2446 proto->memory_allocated != NULL ? atomic_read(proto->memory_allocated) : -1,
2447 proto->memory_pressure != NULL ? *proto->memory_pressure ? "yes" : "no" : "NI",
2448 proto->max_header,
2449 proto->slab == NULL ? "no" : "yes",
2450 module_name(proto->owner),
2451 proto_method_implemented(proto->close),
2452 proto_method_implemented(proto->connect),
2453 proto_method_implemented(proto->disconnect),
2454 proto_method_implemented(proto->accept),
2455 proto_method_implemented(proto->ioctl),
2456 proto_method_implemented(proto->init),
2457 proto_method_implemented(proto->destroy),
2458 proto_method_implemented(proto->shutdown),
2459 proto_method_implemented(proto->setsockopt),
2460 proto_method_implemented(proto->getsockopt),
2461 proto_method_implemented(proto->sendmsg),
2462 proto_method_implemented(proto->recvmsg),
2463 proto_method_implemented(proto->sendpage),
2464 proto_method_implemented(proto->bind),
2465 proto_method_implemented(proto->backlog_rcv),
2466 proto_method_implemented(proto->hash),
2467 proto_method_implemented(proto->unhash),
2468 proto_method_implemented(proto->get_port),
2469 proto_method_implemented(proto->enter_memory_pressure));
2470}
2471
2472static int proto_seq_show(struct seq_file *seq, void *v)
2473{
60f0438a 2474 if (v == &proto_list)
1da177e4
LT		 2475 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
2476 "protocol",
2477 "size",
2478 "sockets",
2479 "memory",
2480 "press",
2481 "maxhdr",
2482 "slab",
2483 "module",
2484 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
2485 else
60f0438a 2486 proto_seq_printf(seq, list_entry(v, struct proto, node));
1da177e4
LT		 2487 return 0;
2488}
2489
f690808e 2490static const struct seq_operations proto_seq_ops = {
1da177e4
LT		 2491 .start = proto_seq_start,
2492 .next = proto_seq_next,
2493 .stop = proto_seq_stop,
2494 .show = proto_seq_show,
2495};
2496
2497static int proto_seq_open(struct inode *inode, struct file *file)
2498{
14e943db
ED		 2499 return seq_open_net(inode, file, &proto_seq_ops,
2500 sizeof(struct seq_net_private));
1da177e4
LT		 2501}
2502
9a32144e 2503static const struct file_operations proto_seq_fops = {
1da177e4
LT		 2504 .owner = THIS_MODULE,
2505 .open = proto_seq_open,
2506 .read = seq_read,
2507 .llseek = seq_lseek,
14e943db
ED		 2508 .release = seq_release_net,
2509};
2510
2511static __net_init int proto_init_net(struct net *net)
2512{
2513 if (!proc_net_fops_create(net, "protocols", S_IRUGO, &proto_seq_fops))
2514 return -ENOMEM;
2515
2516 return 0;
2517}
2518
2519static __net_exit void proto_exit_net(struct net *net)
2520{
2521 proc_net_remove(net, "protocols");
2522}
2523
2524
2525static __net_initdata struct pernet_operations proto_net_ops = {
2526 .init = proto_init_net,
2527 .exit = proto_exit_net,
1da177e4
LT		 2528};
2529
2530static int __init proto_init(void)
2531{
14e943db 2532 return register_pernet_subsys(&proto_net_ops);
1da177e4
LT		 2533}
2534
2535subsys_initcall(proto_init);
2536
2537#endif /* PROC_FS */
Linux kernel - Deliverables
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