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af_unix: Allow connecting to sockets in other network namespaces.
[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 917 case SO_PEERCRED:
109f6e39
EB		 918 {
919 struct ucred peercred;
920 if (len > sizeof(peercred))
921 len = sizeof(peercred);
922 cred_to_ucred(sk->sk_peer_pid, sk->sk_peer_cred, &peercred);
923 if (copy_to_user(optval, &peercred, len))
e71a4783
SH		 924 return -EFAULT;
925 goto lenout;
109f6e39 926 }
1da177e4 927
e71a4783
SH		 928 case SO_PEERNAME:
929 {
930 char address[128];
931
932 if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2))
933 return -ENOTCONN;
934 if (lv < len)
935 return -EINVAL;
936 if (copy_to_user(optval, address, len))
937 return -EFAULT;
938 goto lenout;
939 }
1da177e4 940
e71a4783
SH		 941 /* Dubious BSD thing... Probably nobody even uses it, but
942 * the UNIX standard wants it for whatever reason... -DaveM
943 */
944 case SO_ACCEPTCONN:
945 v.val = sk->sk_state == TCP_LISTEN;
946 break;
1da177e4 947
e71a4783
SH		 948 case SO_PASSSEC:
949 v.val = test_bit(SOCK_PASSSEC, &sock->flags) ? 1 : 0;
950 break;
877ce7c1 951
e71a4783
SH		 952 case SO_PEERSEC:
953 return security_socket_getpeersec_stream(sock, optval, optlen, len);
1da177e4 954
4a19ec58
LAT		 955 case SO_MARK:
956 v.val = sk->sk_mark;
957 break;
958
3b885787
NH		 959 case SO_RXQ_OVFL:
960 v.val = !!sock_flag(sk, SOCK_RXQ_OVFL);
961 break;
962
e71a4783
SH		 963 default:
964 return -ENOPROTOOPT;
1da177e4 965 }
e71a4783 966
1da177e4
LT		 967 if (len > lv)
968 len = lv;
969 if (copy_to_user(optval, &v, len))
970 return -EFAULT;
971lenout:
4ec93edb
YH		 972 if (put_user(len, optlen))
973 return -EFAULT;
974 return 0;
1da177e4
LT		 975}
976
a5b5bb9a
IM		 977/*
978 * Initialize an sk_lock.
979 *
980 * (We also register the sk_lock with the lock validator.)
981 */
b6f99a21 982static inline void sock_lock_init(struct sock *sk)
a5b5bb9a 983{
ed07536e
PZ		 984 sock_lock_init_class_and_name(sk,
985 af_family_slock_key_strings[sk->sk_family],
986 af_family_slock_keys + sk->sk_family,
987 af_family_key_strings[sk->sk_family],
988 af_family_keys + sk->sk_family);
a5b5bb9a
IM		 989}
990
4dc6dc71
ED		 991/*
992 * Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet,
993 * even temporarly, because of RCU lookups. sk_node should also be left as is.
994 */
f1a6c4da
PE		 995static void sock_copy(struct sock *nsk, const struct sock *osk)
996{
997#ifdef CONFIG_SECURITY_NETWORK
998 void *sptr = nsk->sk_security;
999#endif
4dc6dc71 1000 BUILD_BUG_ON(offsetof(struct sock, sk_copy_start) !=
e022f0b4
KK		 1001 sizeof(osk->sk_node) + sizeof(osk->sk_refcnt) +
1002 sizeof(osk->sk_tx_queue_mapping));
4dc6dc71
ED		 1003 memcpy(&nsk->sk_copy_start, &osk->sk_copy_start,
1004 osk->sk_prot->obj_size - offsetof(struct sock, sk_copy_start));
f1a6c4da
PE		 1005#ifdef CONFIG_SECURITY_NETWORK
1006 nsk->sk_security = sptr;
1007 security_sk_clone(osk, nsk);
1008#endif
1009}
1010
2e4afe7b
PE		 1011static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority,
1012 int family)
c308c1b2
PE		 1013{
1014 struct sock *sk;
1015 struct kmem_cache *slab;
1016
1017 slab = prot->slab;
e912b114
ED		 1018 if (slab != NULL) {
1019 sk = kmem_cache_alloc(slab, priority & ~__GFP_ZERO);
1020 if (!sk)
1021 return sk;
1022 if (priority & __GFP_ZERO) {
1023 /*
1024 * caches using SLAB_DESTROY_BY_RCU should let
1025 * sk_node.next un-modified. Special care is taken
1026 * when initializing object to zero.
1027 */
1028 if (offsetof(struct sock, sk_node.next) != 0)
1029 memset(sk, 0, offsetof(struct sock, sk_node.next));
1030 memset(&sk->sk_node.pprev, 0,
1031 prot->obj_size - offsetof(struct sock,
1032 sk_node.pprev));
1033 }
1034 }
c308c1b2
PE		 1035 else
1036 sk = kmalloc(prot->obj_size, priority);
1037
2e4afe7b 1038 if (sk != NULL) {
a98b65a3
VN		 1039 kmemcheck_annotate_bitfield(sk, flags);
1040
2e4afe7b
PE		 1041 if (security_sk_alloc(sk, family, priority))
1042 goto out_free;
1043
1044 if (!try_module_get(prot->owner))
1045 goto out_free_sec;
e022f0b4 1046 sk_tx_queue_clear(sk);
2e4afe7b
PE		 1047 }
1048
c308c1b2 1049 return sk;
2e4afe7b
PE		 1050
1051out_free_sec:
1052 security_sk_free(sk);
1053out_free:
1054 if (slab != NULL)
1055 kmem_cache_free(slab, sk);
1056 else
1057 kfree(sk);
1058 return NULL;
c308c1b2
PE		 1059}
1060
1061static void sk_prot_free(struct proto *prot, struct sock *sk)
1062{
1063 struct kmem_cache *slab;
2e4afe7b 1064 struct module *owner;
c308c1b2 1065
2e4afe7b 1066 owner = prot->owner;
c308c1b2 1067 slab = prot->slab;
2e4afe7b
PE		 1068
1069 security_sk_free(sk);
c308c1b2
PE		 1070 if (slab != NULL)
1071 kmem_cache_free(slab, sk);
1072 else
1073 kfree(sk);
2e4afe7b 1074 module_put(owner);
c308c1b2
PE		 1075}
1076
f8451725
HX		 1077#ifdef CONFIG_CGROUPS
1078void sock_update_classid(struct sock *sk)
1079{
1080 u32 classid = task_cls_classid(current);
1081
1082 if (classid && classid != sk->sk_classid)
1083 sk->sk_classid = classid;
1084}
82862742 1085EXPORT_SYMBOL(sock_update_classid);
f8451725
HX		 1086#endif
1087
1da177e4
LT		 1088/**
1089 * sk_alloc - All socket objects are allocated here
c4ea43c5 1090 * @net: the applicable net namespace
4dc3b16b
PP		 1091 * @family: protocol family
1092 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1093 * @prot: struct proto associated with this new sock instance
1da177e4 1094 */
1b8d7ae4 1095struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
6257ff21 1096 struct proto *prot)
1da177e4 1097{
c308c1b2 1098 struct sock *sk;
1da177e4 1099
154adbc8 1100 sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family);
1da177e4 1101 if (sk) {
154adbc8
PE		 1102 sk->sk_family = family;
1103 /*
1104 * See comment in struct sock definition to understand
1105 * why we need sk_prot_creator -acme
1106 */
1107 sk->sk_prot = sk->sk_prot_creator = prot;
1108 sock_lock_init(sk);
3b1e0a65 1109 sock_net_set(sk, get_net(net));
d66ee058 1110 atomic_set(&sk->sk_wmem_alloc, 1);
f8451725
HX		 1111
1112 sock_update_classid(sk);
1da177e4 1113 }
a79af59e 1114
2e4afe7b 1115 return sk;
1da177e4 1116}
2a91525c 1117EXPORT_SYMBOL(sk_alloc);
1da177e4 1118
2b85a34e 1119static void __sk_free(struct sock *sk)
1da177e4
LT		 1120{
1121 struct sk_filter *filter;
1da177e4
LT		 1122
1123 if (sk->sk_destruct)
1124 sk->sk_destruct(sk);
1125
a898def2
PM		 1126 filter = rcu_dereference_check(sk->sk_filter,
1127 atomic_read(&sk->sk_wmem_alloc) == 0);
1da177e4 1128 if (filter) {
309dd5fc 1129 sk_filter_uncharge(sk, filter);
fda9ef5d 1130 rcu_assign_pointer(sk->sk_filter, NULL);
1da177e4
LT		 1131 }
1132
20d49473
PO		 1133 sock_disable_timestamp(sk, SOCK_TIMESTAMP);
1134 sock_disable_timestamp(sk, SOCK_TIMESTAMPING_RX_SOFTWARE);
1da177e4
LT		 1135
1136 if (atomic_read(&sk->sk_omem_alloc))
1137 printk(KERN_DEBUG "%s: optmem leakage (%d bytes) detected.\n",
0dc47877 1138 __func__, atomic_read(&sk->sk_omem_alloc));
1da177e4 1139
109f6e39
EB		 1140 if (sk->sk_peer_cred)
1141 put_cred(sk->sk_peer_cred);
1142 put_pid(sk->sk_peer_pid);
3b1e0a65 1143 put_net(sock_net(sk));
c308c1b2 1144 sk_prot_free(sk->sk_prot_creator, sk);
1da177e4 1145}
2b85a34e
ED		 1146
1147void sk_free(struct sock *sk)
1148{
1149 /*
1150 * We substract one from sk_wmem_alloc and can know if
1151 * some packets are still in some tx queue.
1152 * If not null, sock_wfree() will call __sk_free(sk) later
1153 */
1154 if (atomic_dec_and_test(&sk->sk_wmem_alloc))
1155 __sk_free(sk);
1156}
2a91525c 1157EXPORT_SYMBOL(sk_free);
1da177e4 1158
edf02087
DL		 1159/*
1160 * Last sock_put should drop referrence to sk->sk_net. It has already
1161 * been dropped in sk_change_net. Taking referrence to stopping namespace
1162 * is not an option.
1163 * Take referrence to a socket to remove it from hash _alive_ and after that
1164 * destroy it in the context of init_net.
1165 */
1166void sk_release_kernel(struct sock *sk)
1167{
1168 if (sk == NULL || sk->sk_socket == NULL)
1169 return;
1170
1171 sock_hold(sk);
1172 sock_release(sk->sk_socket);
65a18ec5 1173 release_net(sock_net(sk));
3b1e0a65 1174 sock_net_set(sk, get_net(&init_net));
edf02087
DL		 1175 sock_put(sk);
1176}
45af1754 1177EXPORT_SYMBOL(sk_release_kernel);
edf02087 1178
dd0fc66f 1179struct sock *sk_clone(const struct sock *sk, const gfp_t priority)
87d11ceb 1180{
8fd1d178 1181 struct sock *newsk;
87d11ceb 1182
8fd1d178 1183 newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family);
87d11ceb
ACM		 1184 if (newsk != NULL) {
1185 struct sk_filter *filter;
1186
892c141e 1187 sock_copy(newsk, sk);
87d11ceb
ACM		 1188
1189 /* SANITY */
3b1e0a65 1190 get_net(sock_net(newsk));
87d11ceb
ACM		 1191 sk_node_init(&newsk->sk_node);
1192 sock_lock_init(newsk);
1193 bh_lock_sock(newsk);
fa438ccf 1194 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL;
8eae939f 1195 newsk->sk_backlog.len = 0;
87d11ceb
ACM		 1196
1197 atomic_set(&newsk->sk_rmem_alloc, 0);
2b85a34e
ED		 1198 /*
1199 * sk_wmem_alloc set to one (see sk_free() and sock_wfree())
1200 */
1201 atomic_set(&newsk->sk_wmem_alloc, 1);
87d11ceb
ACM		 1202 atomic_set(&newsk->sk_omem_alloc, 0);
1203 skb_queue_head_init(&newsk->sk_receive_queue);
1204 skb_queue_head_init(&newsk->sk_write_queue);
97fc2f08
CL		 1205#ifdef CONFIG_NET_DMA
1206 skb_queue_head_init(&newsk->sk_async_wait_queue);
1207#endif
87d11ceb 1208
b6c6712a 1209 spin_lock_init(&newsk->sk_dst_lock);
87d11ceb 1210 rwlock_init(&newsk->sk_callback_lock);
443aef0e
PZ		 1211 lockdep_set_class_and_name(&newsk->sk_callback_lock,
1212 af_callback_keys + newsk->sk_family,
1213 af_family_clock_key_strings[newsk->sk_family]);
87d11ceb
ACM		 1214
1215 newsk->sk_dst_cache = NULL;
1216 newsk->sk_wmem_queued = 0;
1217 newsk->sk_forward_alloc = 0;
1218 newsk->sk_send_head = NULL;
87d11ceb
ACM		 1219 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
1220
1221 sock_reset_flag(newsk, SOCK_DONE);
1222 skb_queue_head_init(&newsk->sk_error_queue);
1223
1224 filter = newsk->sk_filter;
1225 if (filter != NULL)
1226 sk_filter_charge(newsk, filter);
1227
1228 if (unlikely(xfrm_sk_clone_policy(newsk))) {
1229 /* It is still raw copy of parent, so invalidate
1230 * destructor and make plain sk_free() */
1231 newsk->sk_destruct = NULL;
1232 sk_free(newsk);
1233 newsk = NULL;
1234 goto out;
1235 }
1236
1237 newsk->sk_err = 0;
1238 newsk->sk_priority = 0;
4dc6dc71
ED		 1239 /*
1240 * Before updating sk_refcnt, we must commit prior changes to memory
1241 * (Documentation/RCU/rculist_nulls.txt for details)
1242 */
1243 smp_wmb();
87d11ceb
ACM		 1244 atomic_set(&newsk->sk_refcnt, 2);
1245
1246 /*
1247 * Increment the counter in the same struct proto as the master
1248 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
1249 * is the same as sk->sk_prot->socks, as this field was copied
1250 * with memcpy).
1251 *
1252 * This _changes_ the previous behaviour, where
1253 * tcp_create_openreq_child always was incrementing the
1254 * equivalent to tcp_prot->socks (inet_sock_nr), so this have
1255 * to be taken into account in all callers. -acme
1256 */
1257 sk_refcnt_debug_inc(newsk);
972692e0 1258 sk_set_socket(newsk, NULL);
43815482 1259 newsk->sk_wq = NULL;
87d11ceb
ACM		 1260
1261 if (newsk->sk_prot->sockets_allocated)
1748376b 1262 percpu_counter_inc(newsk->sk_prot->sockets_allocated);
704da560
OP		 1263
1264 if (sock_flag(newsk, SOCK_TIMESTAMP) ||
1265 sock_flag(newsk, SOCK_TIMESTAMPING_RX_SOFTWARE))
1266 net_enable_timestamp();
87d11ceb
ACM		 1267 }
1268out:
1269 return newsk;
1270}
87d11ceb
ACM		 1271EXPORT_SYMBOL_GPL(sk_clone);
1272
9958089a
AK		 1273void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
1274{
1275 __sk_dst_set(sk, dst);
1276 sk->sk_route_caps = dst->dev->features;
1277 if (sk->sk_route_caps & NETIF_F_GSO)
4fcd6b99 1278 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE;
a465419b 1279 sk->sk_route_caps &= ~sk->sk_route_nocaps;
9958089a 1280 if (sk_can_gso(sk)) {
82cc1a7a 1281 if (dst->header_len) {
9958089a 1282 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
82cc1a7a 1283 } else {
9958089a 1284 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
82cc1a7a
PWJ		 1285 sk->sk_gso_max_size = dst->dev->gso_max_size;
1286 }
9958089a
AK		 1287 }
1288}
1289EXPORT_SYMBOL_GPL(sk_setup_caps);
1290
1da177e4
LT		 1291void __init sk_init(void)
1292{
4481374c 1293 if (totalram_pages <= 4096) {
1da177e4
LT		 1294 sysctl_wmem_max = 32767;
1295 sysctl_rmem_max = 32767;
1296 sysctl_wmem_default = 32767;
1297 sysctl_rmem_default = 32767;
4481374c 1298 } else if (totalram_pages >= 131072) {
1da177e4
LT		 1299 sysctl_wmem_max = 131071;
1300 sysctl_rmem_max = 131071;
1301 }
1302}
1303
1304/*
1305 * Simple resource managers for sockets.
1306 */
1307
1308
4ec93edb
YH		 1309/*
1310 * Write buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1311 */
1312void sock_wfree(struct sk_buff *skb)
1313{
1314 struct sock *sk = skb->sk;
d99927f4 1315 unsigned int len = skb->truesize;
1da177e4 1316
d99927f4
ED		 1317 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) {
1318 /*
1319 * Keep a reference on sk_wmem_alloc, this will be released
1320 * after sk_write_space() call
1321 */
1322 atomic_sub(len - 1, &sk->sk_wmem_alloc);
1da177e4 1323 sk->sk_write_space(sk);
d99927f4
ED		 1324 len = 1;
1325 }
2b85a34e 1326 /*
d99927f4
ED		 1327 * if sk_wmem_alloc reaches 0, we must finish what sk_free()
1328 * could not do because of in-flight packets
2b85a34e 1329 */
d99927f4 1330 if (atomic_sub_and_test(len, &sk->sk_wmem_alloc))
2b85a34e 1331 __sk_free(sk);
1da177e4 1332}
2a91525c 1333EXPORT_SYMBOL(sock_wfree);
1da177e4 1334
4ec93edb
YH		 1335/*
1336 * Read buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1337 */
1338void sock_rfree(struct sk_buff *skb)
1339{
1340 struct sock *sk = skb->sk;
1341
1342 atomic_sub(skb->truesize, &sk->sk_rmem_alloc);
3ab224be 1343 sk_mem_uncharge(skb->sk, skb->truesize);
1da177e4 1344}
2a91525c 1345EXPORT_SYMBOL(sock_rfree);
1da177e4
LT		 1346
1347
1348int sock_i_uid(struct sock *sk)
1349{
1350 int uid;
1351
1352 read_lock(&sk->sk_callback_lock);
1353 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : 0;
1354 read_unlock(&sk->sk_callback_lock);
1355 return uid;
1356}
2a91525c 1357EXPORT_SYMBOL(sock_i_uid);
1da177e4
LT		 1358
1359unsigned long sock_i_ino(struct sock *sk)
1360{
1361 unsigned long ino;
1362
1363 read_lock(&sk->sk_callback_lock);
1364 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
1365 read_unlock(&sk->sk_callback_lock);
1366 return ino;
1367}
2a91525c 1368EXPORT_SYMBOL(sock_i_ino);
1da177e4
LT		 1369
1370/*
1371 * Allocate a skb from the socket's send buffer.
1372 */
86a76caf 1373struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
dd0fc66f 1374 gfp_t priority)
1da177e4
LT		 1375{
1376 if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
2a91525c 1377 struct sk_buff *skb = alloc_skb(size, priority);
1da177e4
LT		 1378 if (skb) {
1379 skb_set_owner_w(skb, sk);
1380 return skb;
1381 }
1382 }
1383 return NULL;
1384}
2a91525c 1385EXPORT_SYMBOL(sock_wmalloc);
1da177e4
LT		 1386
1387/*
1388 * Allocate a skb from the socket's receive buffer.
4ec93edb 1389 */
86a76caf 1390struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force,
dd0fc66f 1391 gfp_t priority)
1da177e4
LT		 1392{
1393 if (force || atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) {
1394 struct sk_buff *skb = alloc_skb(size, priority);
1395 if (skb) {
1396 skb_set_owner_r(skb, sk);
1397 return skb;
1398 }
1399 }
1400 return NULL;
1401}
1402
4ec93edb 1403/*
1da177e4 1404 * Allocate a memory block from the socket's option memory buffer.
4ec93edb 1405 */
dd0fc66f 1406void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
1da177e4
LT		 1407{
1408 if ((unsigned)size <= sysctl_optmem_max &&
1409 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) {
1410 void *mem;
1411 /* First do the add, to avoid the race if kmalloc
4ec93edb 1412 * might sleep.
1da177e4
LT		 1413 */
1414 atomic_add(size, &sk->sk_omem_alloc);
1415 mem = kmalloc(size, priority);
1416 if (mem)
1417 return mem;
1418 atomic_sub(size, &sk->sk_omem_alloc);
1419 }
1420 return NULL;
1421}
2a91525c 1422EXPORT_SYMBOL(sock_kmalloc);
1da177e4
LT		 1423
1424/*
1425 * Free an option memory block.
1426 */
1427void sock_kfree_s(struct sock *sk, void *mem, int size)
1428{
1429 kfree(mem);
1430 atomic_sub(size, &sk->sk_omem_alloc);
1431}
2a91525c 1432EXPORT_SYMBOL(sock_kfree_s);
1da177e4
LT		 1433
1434/* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
1435 I think, these locks should be removed for datagram sockets.
1436 */
2a91525c 1437static long sock_wait_for_wmem(struct sock *sk, long timeo)
1da177e4
LT		 1438{
1439 DEFINE_WAIT(wait);
1440
1441 clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1442 for (;;) {
1443 if (!timeo)
1444 break;
1445 if (signal_pending(current))
1446 break;
1447 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
aa395145 1448 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1da177e4
LT		 1449 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf)
1450 break;
1451 if (sk->sk_shutdown & SEND_SHUTDOWN)
1452 break;
1453 if (sk->sk_err)
1454 break;
1455 timeo = schedule_timeout(timeo);
1456 }
aa395145 1457 finish_wait(sk_sleep(sk), &wait);
1da177e4
LT		 1458 return timeo;
1459}
1460
1461
1462/*
1463 * Generic send/receive buffer handlers
1464 */
1465
4cc7f68d
HX		 1466struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len,
1467 unsigned long data_len, int noblock,
1468 int *errcode)
1da177e4
LT		 1469{
1470 struct sk_buff *skb;
7d877f3b 1471 gfp_t gfp_mask;
1da177e4
LT		 1472 long timeo;
1473 int err;
1474
1475 gfp_mask = sk->sk_allocation;
1476 if (gfp_mask & __GFP_WAIT)
1477 gfp_mask |= __GFP_REPEAT;
1478
1479 timeo = sock_sndtimeo(sk, noblock);
1480 while (1) {
1481 err = sock_error(sk);
1482 if (err != 0)
1483 goto failure;
1484
1485 err = -EPIPE;
1486 if (sk->sk_shutdown & SEND_SHUTDOWN)
1487 goto failure;
1488
1489 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
db38c179 1490 skb = alloc_skb(header_len, gfp_mask);
1da177e4
LT		 1491 if (skb) {
1492 int npages;
1493 int i;
1494
1495 /* No pages, we're done... */
1496 if (!data_len)
1497 break;
1498
1499 npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
1500 skb->truesize += data_len;
1501 skb_shinfo(skb)->nr_frags = npages;
1502 for (i = 0; i < npages; i++) {
1503 struct page *page;
1504 skb_frag_t *frag;
1505
1506 page = alloc_pages(sk->sk_allocation, 0);
1507 if (!page) {
1508 err = -ENOBUFS;
1509 skb_shinfo(skb)->nr_frags = i;
1510 kfree_skb(skb);
1511 goto failure;
1512 }
1513
1514 frag = &skb_shinfo(skb)->frags[i];
1515 frag->page = page;
1516 frag->page_offset = 0;
1517 frag->size = (data_len >= PAGE_SIZE ?
1518 PAGE_SIZE :
1519 data_len);
1520 data_len -= PAGE_SIZE;
1521 }
1522
1523 /* Full success... */
1524 break;
1525 }
1526 err = -ENOBUFS;
1527 goto failure;
1528 }
1529 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1530 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1531 err = -EAGAIN;
1532 if (!timeo)
1533 goto failure;
1534 if (signal_pending(current))
1535 goto interrupted;
1536 timeo = sock_wait_for_wmem(sk, timeo);
1537 }
1538
1539 skb_set_owner_w(skb, sk);
1540 return skb;
1541
1542interrupted:
1543 err = sock_intr_errno(timeo);
1544failure:
1545 *errcode = err;
1546 return NULL;
1547}
4cc7f68d 1548EXPORT_SYMBOL(sock_alloc_send_pskb);
1da177e4 1549
4ec93edb 1550struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
1da177e4
LT		 1551 int noblock, int *errcode)
1552{
1553 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode);
1554}
2a91525c 1555EXPORT_SYMBOL(sock_alloc_send_skb);
1da177e4
LT		 1556
1557static void __lock_sock(struct sock *sk)
1558{
1559 DEFINE_WAIT(wait);
1560
e71a4783 1561 for (;;) {
1da177e4
LT		 1562 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
1563 TASK_UNINTERRUPTIBLE);
1564 spin_unlock_bh(&sk->sk_lock.slock);
1565 schedule();
1566 spin_lock_bh(&sk->sk_lock.slock);
e71a4783 1567 if (!sock_owned_by_user(sk))
1da177e4
LT		 1568 break;
1569 }
1570 finish_wait(&sk->sk_lock.wq, &wait);
1571}
1572
1573static void __release_sock(struct sock *sk)
1574{
1575 struct sk_buff *skb = sk->sk_backlog.head;
1576
1577 do {
1578 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
1579 bh_unlock_sock(sk);
1580
1581 do {
1582 struct sk_buff *next = skb->next;
1583
7fee226a 1584 WARN_ON_ONCE(skb_dst_is_noref(skb));
1da177e4 1585 skb->next = NULL;
c57943a1 1586 sk_backlog_rcv(sk, skb);
1da177e4
LT		 1587
1588 /*
1589 * We are in process context here with softirqs
1590 * disabled, use cond_resched_softirq() to preempt.
1591 * This is safe to do because we've taken the backlog
1592 * queue private:
1593 */
1594 cond_resched_softirq();
1595
1596 skb = next;
1597 } while (skb != NULL);
1598
1599 bh_lock_sock(sk);
e71a4783 1600 } while ((skb = sk->sk_backlog.head) != NULL);
8eae939f
ZY		 1601
1602 /*
1603 * Doing the zeroing here guarantee we can not loop forever
1604 * while a wild producer attempts to flood us.
1605 */
1606 sk->sk_backlog.len = 0;
1da177e4
LT		 1607}
1608
1609/**
1610 * sk_wait_data - wait for data to arrive at sk_receive_queue
4dc3b16b
PP		 1611 * @sk: sock to wait on
1612 * @timeo: for how long
1da177e4
LT		 1613 *
1614 * Now socket state including sk->sk_err is changed only under lock,
1615 * hence we may omit checks after joining wait queue.
1616 * We check receive queue before schedule() only as optimization;
1617 * it is very likely that release_sock() added new data.
1618 */
1619int sk_wait_data(struct sock *sk, long *timeo)
1620{
1621 int rc;
1622 DEFINE_WAIT(wait);
1623
aa395145 1624 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1da177e4
LT		 1625 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1626 rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue));
1627 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
aa395145 1628 finish_wait(sk_sleep(sk), &wait);
1da177e4
LT		 1629 return rc;
1630}
1da177e4
LT		 1631EXPORT_SYMBOL(sk_wait_data);
1632
3ab224be
HA		 1633/**
1634 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated
1635 * @sk: socket
1636 * @size: memory size to allocate
1637 * @kind: allocation type
1638 *
1639 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means
1640 * rmem allocation. This function assumes that protocols which have
1641 * memory_pressure use sk_wmem_queued as write buffer accounting.
1642 */
1643int __sk_mem_schedule(struct sock *sk, int size, int kind)
1644{
1645 struct proto *prot = sk->sk_prot;
1646 int amt = sk_mem_pages(size);
1647 int allocated;
1648
1649 sk->sk_forward_alloc += amt * SK_MEM_QUANTUM;
1650 allocated = atomic_add_return(amt, prot->memory_allocated);
1651
1652 /* Under limit. */
1653 if (allocated <= prot->sysctl_mem[0]) {
1654 if (prot->memory_pressure && *prot->memory_pressure)
1655 *prot->memory_pressure = 0;
1656 return 1;
1657 }
1658
1659 /* Under pressure. */
1660 if (allocated > prot->sysctl_mem[1])
1661 if (prot->enter_memory_pressure)
5c52ba17 1662 prot->enter_memory_pressure(sk);
3ab224be
HA		 1663
1664 /* Over hard limit. */
1665 if (allocated > prot->sysctl_mem[2])
1666 goto suppress_allocation;
1667
1668 /* guarantee minimum buffer size under pressure */
1669 if (kind == SK_MEM_RECV) {
1670 if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0])
1671 return 1;
1672 } else { /* SK_MEM_SEND */
1673 if (sk->sk_type == SOCK_STREAM) {
1674 if (sk->sk_wmem_queued < prot->sysctl_wmem[0])
1675 return 1;
1676 } else if (atomic_read(&sk->sk_wmem_alloc) <
1677 prot->sysctl_wmem[0])
1678 return 1;
1679 }
1680
1681 if (prot->memory_pressure) {
1748376b
ED		 1682 int alloc;
1683
1684 if (!*prot->memory_pressure)
1685 return 1;
1686 alloc = percpu_counter_read_positive(prot->sockets_allocated);
1687 if (prot->sysctl_mem[2] > alloc *
3ab224be
HA		 1688 sk_mem_pages(sk->sk_wmem_queued +
1689 atomic_read(&sk->sk_rmem_alloc) +
1690 sk->sk_forward_alloc))
1691 return 1;
1692 }
1693
1694suppress_allocation:
1695
1696 if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) {
1697 sk_stream_moderate_sndbuf(sk);
1698
1699 /* Fail only if socket is _under_ its sndbuf.
1700 * In this case we cannot block, so that we have to fail.
1701 */
1702 if (sk->sk_wmem_queued + size >= sk->sk_sndbuf)
1703 return 1;
1704 }
1705
1706 /* Alas. Undo changes. */
1707 sk->sk_forward_alloc -= amt * SK_MEM_QUANTUM;
1708 atomic_sub(amt, prot->memory_allocated);
1709 return 0;
1710}
3ab224be
HA		 1711EXPORT_SYMBOL(__sk_mem_schedule);
1712
1713/**
1714 * __sk_reclaim - reclaim memory_allocated
1715 * @sk: socket
1716 */
1717void __sk_mem_reclaim(struct sock *sk)
1718{
1719 struct proto *prot = sk->sk_prot;
1720
680a5a50 1721 atomic_sub(sk->sk_forward_alloc >> SK_MEM_QUANTUM_SHIFT,
3ab224be
HA		 1722 prot->memory_allocated);
1723 sk->sk_forward_alloc &= SK_MEM_QUANTUM - 1;
1724
1725 if (prot->memory_pressure && *prot->memory_pressure &&
1726 (atomic_read(prot->memory_allocated) < prot->sysctl_mem[0]))
1727 *prot->memory_pressure = 0;
1728}
3ab224be
HA		 1729EXPORT_SYMBOL(__sk_mem_reclaim);
1730
1731
1da177e4
LT		 1732/*
1733 * Set of default routines for initialising struct proto_ops when
1734 * the protocol does not support a particular function. In certain
1735 * cases where it makes no sense for a protocol to have a "do nothing"
1736 * function, some default processing is provided.
1737 */
1738
1739int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
1740{
1741 return -EOPNOTSUPP;
1742}
2a91525c 1743EXPORT_SYMBOL(sock_no_bind);
1da177e4 1744
4ec93edb 1745int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 1746 int len, int flags)
1747{
1748 return -EOPNOTSUPP;
1749}
2a91525c 1750EXPORT_SYMBOL(sock_no_connect);
1da177e4
LT		 1751
1752int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
1753{
1754 return -EOPNOTSUPP;
1755}
2a91525c 1756EXPORT_SYMBOL(sock_no_socketpair);
1da177e4
LT		 1757
1758int sock_no_accept(struct socket *sock, struct socket *newsock, int flags)
1759{
1760 return -EOPNOTSUPP;
1761}
2a91525c 1762EXPORT_SYMBOL(sock_no_accept);
1da177e4 1763
4ec93edb 1764int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 1765 int *len, int peer)
1766{
1767 return -EOPNOTSUPP;
1768}
2a91525c 1769EXPORT_SYMBOL(sock_no_getname);
1da177e4 1770
2a91525c 1771unsigned int sock_no_poll(struct file *file, struct socket *sock, poll_table *pt)
1da177e4
LT		 1772{
1773 return 0;
1774}
2a91525c 1775EXPORT_SYMBOL(sock_no_poll);
1da177e4
LT		 1776
1777int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1778{
1779 return -EOPNOTSUPP;
1780}
2a91525c 1781EXPORT_SYMBOL(sock_no_ioctl);
1da177e4
LT		 1782
1783int sock_no_listen(struct socket *sock, int backlog)
1784{
1785 return -EOPNOTSUPP;
1786}
2a91525c 1787EXPORT_SYMBOL(sock_no_listen);
1da177e4
LT		 1788
1789int sock_no_shutdown(struct socket *sock, int how)
1790{
1791 return -EOPNOTSUPP;
1792}
2a91525c 1793EXPORT_SYMBOL(sock_no_shutdown);
1da177e4
LT		 1794
1795int sock_no_setsockopt(struct socket *sock, int level, int optname,
b7058842 1796 char __user *optval, unsigned int optlen)
1da177e4
LT		 1797{
1798 return -EOPNOTSUPP;
1799}
2a91525c 1800EXPORT_SYMBOL(sock_no_setsockopt);
1da177e4
LT		 1801
1802int sock_no_getsockopt(struct socket *sock, int level, int optname,
1803 char __user *optval, int __user *optlen)
1804{
1805 return -EOPNOTSUPP;
1806}
2a91525c 1807EXPORT_SYMBOL(sock_no_getsockopt);
1da177e4
LT		 1808
1809int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
1810 size_t len)
1811{
1812 return -EOPNOTSUPP;
1813}
2a91525c 1814EXPORT_SYMBOL(sock_no_sendmsg);
1da177e4
LT		 1815
1816int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
1817 size_t len, int flags)
1818{
1819 return -EOPNOTSUPP;
1820}
2a91525c 1821EXPORT_SYMBOL(sock_no_recvmsg);
1da177e4
LT		 1822
1823int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
1824{
1825 /* Mirror missing mmap method error code */
1826 return -ENODEV;
1827}
2a91525c 1828EXPORT_SYMBOL(sock_no_mmap);
1da177e4
LT		 1829
1830ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
1831{
1832 ssize_t res;
1833 struct msghdr msg = {.msg_flags = flags};
1834 struct kvec iov;
1835 char *kaddr = kmap(page);
1836 iov.iov_base = kaddr + offset;
1837 iov.iov_len = size;
1838 res = kernel_sendmsg(sock, &msg, &iov, 1, size);
1839 kunmap(page);
1840 return res;
1841}
2a91525c 1842EXPORT_SYMBOL(sock_no_sendpage);
1da177e4
LT		 1843
1844/*
1845 * Default Socket Callbacks
1846 */
1847
1848static void sock_def_wakeup(struct sock *sk)
1849{
43815482
ED		 1850 struct socket_wq *wq;
1851
1852 rcu_read_lock();
1853 wq = rcu_dereference(sk->sk_wq);
1854 if (wq_has_sleeper(wq))
1855 wake_up_interruptible_all(&wq->wait);
1856 rcu_read_unlock();
1da177e4
LT		 1857}
1858
1859static void sock_def_error_report(struct sock *sk)
1860{
43815482
ED		 1861 struct socket_wq *wq;
1862
1863 rcu_read_lock();
1864 wq = rcu_dereference(sk->sk_wq);
1865 if (wq_has_sleeper(wq))
1866 wake_up_interruptible_poll(&wq->wait, POLLERR);
8d8ad9d7 1867 sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR);
43815482 1868 rcu_read_unlock();
1da177e4
LT		 1869}
1870
1871static void sock_def_readable(struct sock *sk, int len)
1872{
43815482
ED		 1873 struct socket_wq *wq;
1874
1875 rcu_read_lock();
1876 wq = rcu_dereference(sk->sk_wq);
1877 if (wq_has_sleeper(wq))
1878 wake_up_interruptible_sync_poll(&wq->wait, POLLIN |
37e5540b 1879 POLLRDNORM | POLLRDBAND);
8d8ad9d7 1880 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
43815482 1881 rcu_read_unlock();
1da177e4
LT		 1882}
1883
1884static void sock_def_write_space(struct sock *sk)
1885{
43815482
ED		 1886 struct socket_wq *wq;
1887
1888 rcu_read_lock();
1da177e4
LT		 1889
1890 /* Do not wake up a writer until he can make "significant"
1891 * progress. --DaveM
1892 */
e71a4783 1893 if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) {
43815482
ED		 1894 wq = rcu_dereference(sk->sk_wq);
1895 if (wq_has_sleeper(wq))
1896 wake_up_interruptible_sync_poll(&wq->wait, POLLOUT |
37e5540b 1897 POLLWRNORM | POLLWRBAND);
1da177e4
LT		 1898
1899 /* Should agree with poll, otherwise some programs break */
1900 if (sock_writeable(sk))
8d8ad9d7 1901 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
1da177e4
LT		 1902 }
1903
43815482 1904 rcu_read_unlock();
1da177e4
LT		 1905}
1906
1907static void sock_def_destruct(struct sock *sk)
1908{
a51482bd 1909 kfree(sk->sk_protinfo);
1da177e4
LT		 1910}
1911
1912void sk_send_sigurg(struct sock *sk)
1913{
1914 if (sk->sk_socket && sk->sk_socket->file)
1915 if (send_sigurg(&sk->sk_socket->file->f_owner))
8d8ad9d7 1916 sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI);
1da177e4 1917}
2a91525c 1918EXPORT_SYMBOL(sk_send_sigurg);
1da177e4
LT		 1919
1920void sk_reset_timer(struct sock *sk, struct timer_list* timer,
1921 unsigned long expires)
1922{
1923 if (!mod_timer(timer, expires))
1924 sock_hold(sk);
1925}
1da177e4
LT		 1926EXPORT_SYMBOL(sk_reset_timer);
1927
1928void sk_stop_timer(struct sock *sk, struct timer_list* timer)
1929{
1930 if (timer_pending(timer) && del_timer(timer))
1931 __sock_put(sk);
1932}
1da177e4
LT		 1933EXPORT_SYMBOL(sk_stop_timer);
1934
1935void sock_init_data(struct socket *sock, struct sock *sk)
1936{
1937 skb_queue_head_init(&sk->sk_receive_queue);
1938 skb_queue_head_init(&sk->sk_write_queue);
1939 skb_queue_head_init(&sk->sk_error_queue);
97fc2f08
CL		 1940#ifdef CONFIG_NET_DMA
1941 skb_queue_head_init(&sk->sk_async_wait_queue);
1942#endif
1da177e4
LT		 1943
1944 sk->sk_send_head = NULL;
1945
1946 init_timer(&sk->sk_timer);
4ec93edb 1947
1da177e4
LT		 1948 sk->sk_allocation = GFP_KERNEL;
1949 sk->sk_rcvbuf = sysctl_rmem_default;
1950 sk->sk_sndbuf = sysctl_wmem_default;
1951 sk->sk_state = TCP_CLOSE;
972692e0 1952 sk_set_socket(sk, sock);
1da177e4
LT		 1953
1954 sock_set_flag(sk, SOCK_ZAPPED);
1955
e71a4783 1956 if (sock) {
1da177e4 1957 sk->sk_type = sock->type;
43815482 1958 sk->sk_wq = sock->wq;
1da177e4
LT		 1959 sock->sk = sk;
1960 } else
43815482 1961 sk->sk_wq = NULL;
1da177e4 1962
b6c6712a 1963 spin_lock_init(&sk->sk_dst_lock);
1da177e4 1964 rwlock_init(&sk->sk_callback_lock);
443aef0e
PZ		 1965 lockdep_set_class_and_name(&sk->sk_callback_lock,
1966 af_callback_keys + sk->sk_family,
1967 af_family_clock_key_strings[sk->sk_family]);
1da177e4
LT		 1968
1969 sk->sk_state_change = sock_def_wakeup;
1970 sk->sk_data_ready = sock_def_readable;
1971 sk->sk_write_space = sock_def_write_space;
1972 sk->sk_error_report = sock_def_error_report;
1973 sk->sk_destruct = sock_def_destruct;
1974
1975 sk->sk_sndmsg_page = NULL;
1976 sk->sk_sndmsg_off = 0;
1977
109f6e39
EB		 1978 sk->sk_peer_pid = NULL;
1979 sk->sk_peer_cred = NULL;
1da177e4
LT		 1980 sk->sk_write_pending = 0;
1981 sk->sk_rcvlowat = 1;
1982 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
1983 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
1984
f37f0afb 1985 sk->sk_stamp = ktime_set(-1L, 0);
1da177e4 1986
4dc6dc71
ED		 1987 /*
1988 * Before updating sk_refcnt, we must commit prior changes to memory
1989 * (Documentation/RCU/rculist_nulls.txt for details)
1990 */
1991 smp_wmb();
1da177e4 1992 atomic_set(&sk->sk_refcnt, 1);
33c732c3 1993 atomic_set(&sk->sk_drops, 0);
1da177e4 1994}
2a91525c 1995EXPORT_SYMBOL(sock_init_data);
1da177e4 1996
b5606c2d 1997void lock_sock_nested(struct sock *sk, int subclass)
1da177e4
LT		 1998{
1999 might_sleep();
a5b5bb9a 2000 spin_lock_bh(&sk->sk_lock.slock);
d2e9117c 2001 if (sk->sk_lock.owned)
1da177e4 2002 __lock_sock(sk);
d2e9117c 2003 sk->sk_lock.owned = 1;
a5b5bb9a
IM		 2004 spin_unlock(&sk->sk_lock.slock);
2005 /*
2006 * The sk_lock has mutex_lock() semantics here:
2007 */
fcc70d5f 2008 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
a5b5bb9a 2009 local_bh_enable();
1da177e4 2010}
fcc70d5f 2011EXPORT_SYMBOL(lock_sock_nested);
1da177e4 2012
b5606c2d 2013void release_sock(struct sock *sk)
1da177e4 2014{
a5b5bb9a
IM		 2015 /*
2016 * The sk_lock has mutex_unlock() semantics:
2017 */
2018 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
2019
2020 spin_lock_bh(&sk->sk_lock.slock);
1da177e4
LT		 2021 if (sk->sk_backlog.tail)
2022 __release_sock(sk);
d2e9117c 2023 sk->sk_lock.owned = 0;
a5b5bb9a
IM		 2024 if (waitqueue_active(&sk->sk_lock.wq))
2025 wake_up(&sk->sk_lock.wq);
2026 spin_unlock_bh(&sk->sk_lock.slock);
1da177e4
LT		 2027}
2028EXPORT_SYMBOL(release_sock);
2029
8a74ad60
ED		 2030/**
2031 * lock_sock_fast - fast version of lock_sock
2032 * @sk: socket
2033 *
2034 * This version should be used for very small section, where process wont block
2035 * return false if fast path is taken
2036 * sk_lock.slock locked, owned = 0, BH disabled
2037 * return true if slow path is taken
2038 * sk_lock.slock unlocked, owned = 1, BH enabled
2039 */
2040bool lock_sock_fast(struct sock *sk)
2041{
2042 might_sleep();
2043 spin_lock_bh(&sk->sk_lock.slock);
2044
2045 if (!sk->sk_lock.owned)
2046 /*
2047 * Note : We must disable BH
2048 */
2049 return false;
2050
2051 __lock_sock(sk);
2052 sk->sk_lock.owned = 1;
2053 spin_unlock(&sk->sk_lock.slock);
2054 /*
2055 * The sk_lock has mutex_lock() semantics here:
2056 */
2057 mutex_acquire(&sk->sk_lock.dep_map, 0, 0, _RET_IP_);
2058 local_bh_enable();
2059 return true;
2060}
2061EXPORT_SYMBOL(lock_sock_fast);
2062
1da177e4 2063int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
4ec93edb 2064{
b7aa0bf7 2065 struct timeval tv;
1da177e4 2066 if (!sock_flag(sk, SOCK_TIMESTAMP))
20d49473 2067 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
b7aa0bf7
ED		 2068 tv = ktime_to_timeval(sk->sk_stamp);
2069 if (tv.tv_sec == -1)
1da177e4 2070 return -ENOENT;
b7aa0bf7
ED		 2071 if (tv.tv_sec == 0) {
2072 sk->sk_stamp = ktime_get_real();
2073 tv = ktime_to_timeval(sk->sk_stamp);
2074 }
2075 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0;
4ec93edb 2076}
1da177e4
LT		 2077EXPORT_SYMBOL(sock_get_timestamp);
2078
ae40eb1e
ED		 2079int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
2080{
2081 struct timespec ts;
2082 if (!sock_flag(sk, SOCK_TIMESTAMP))
20d49473 2083 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
ae40eb1e
ED		 2084 ts = ktime_to_timespec(sk->sk_stamp);
2085 if (ts.tv_sec == -1)
2086 return -ENOENT;
2087 if (ts.tv_sec == 0) {
2088 sk->sk_stamp = ktime_get_real();
2089 ts = ktime_to_timespec(sk->sk_stamp);
2090 }
2091 return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0;
2092}
2093EXPORT_SYMBOL(sock_get_timestampns);
2094
20d49473 2095void sock_enable_timestamp(struct sock *sk, int flag)
4ec93edb 2096{
20d49473
PO		 2097 if (!sock_flag(sk, flag)) {
2098 sock_set_flag(sk, flag);
2099 /*
2100 * we just set one of the two flags which require net
2101 * time stamping, but time stamping might have been on
2102 * already because of the other one
2103 */
2104 if (!sock_flag(sk,
2105 flag == SOCK_TIMESTAMP ?
2106 SOCK_TIMESTAMPING_RX_SOFTWARE :
2107 SOCK_TIMESTAMP))
2108 net_enable_timestamp();
1da177e4
LT		 2109 }
2110}
1da177e4
LT		 2111
2112/*
2113 * Get a socket option on an socket.
2114 *
2115 * FIX: POSIX 1003.1g is very ambiguous here. It states that
2116 * asynchronous errors should be reported by getsockopt. We assume
2117 * this means if you specify SO_ERROR (otherwise whats the point of it).
2118 */
2119int sock_common_getsockopt(struct socket *sock, int level, int optname,
2120 char __user *optval, int __user *optlen)
2121{
2122 struct sock *sk = sock->sk;
2123
2124 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2125}
1da177e4
LT		 2126EXPORT_SYMBOL(sock_common_getsockopt);
2127
3fdadf7d 2128#ifdef CONFIG_COMPAT
543d9cfe
ACM		 2129int compat_sock_common_getsockopt(struct socket *sock, int level, int optname,
2130 char __user *optval, int __user *optlen)
3fdadf7d
DM		 2131{
2132 struct sock *sk = sock->sk;
2133
1e51f951 2134 if (sk->sk_prot->compat_getsockopt != NULL)
543d9cfe
ACM		 2135 return sk->sk_prot->compat_getsockopt(sk, level, optname,
2136 optval, optlen);
3fdadf7d
DM		 2137 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2138}
2139EXPORT_SYMBOL(compat_sock_common_getsockopt);
2140#endif
2141
1da177e4
LT		 2142int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock,
2143 struct msghdr *msg, size_t size, int flags)
2144{
2145 struct sock *sk = sock->sk;
2146 int addr_len = 0;
2147 int err;
2148
2149 err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT,
2150 flags & ~MSG_DONTWAIT, &addr_len);
2151 if (err >= 0)
2152 msg->msg_namelen = addr_len;
2153 return err;
2154}
1da177e4
LT		 2155EXPORT_SYMBOL(sock_common_recvmsg);
2156
2157/*
2158 * Set socket options on an inet socket.
2159 */
2160int sock_common_setsockopt(struct socket *sock, int level, int optname,
b7058842 2161 char __user *optval, unsigned int optlen)
1da177e4
LT		 2162{
2163 struct sock *sk = sock->sk;
2164
2165 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2166}
1da177e4
LT		 2167EXPORT_SYMBOL(sock_common_setsockopt);
2168
3fdadf7d 2169#ifdef CONFIG_COMPAT
543d9cfe 2170int compat_sock_common_setsockopt(struct socket *sock, int level, int optname,
b7058842 2171 char __user *optval, unsigned int optlen)
3fdadf7d
DM		 2172{
2173 struct sock *sk = sock->sk;
2174
543d9cfe
ACM		 2175 if (sk->sk_prot->compat_setsockopt != NULL)
2176 return sk->sk_prot->compat_setsockopt(sk, level, optname,
2177 optval, optlen);
3fdadf7d
DM		 2178 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2179}
2180EXPORT_SYMBOL(compat_sock_common_setsockopt);
2181#endif
2182
1da177e4
LT		 2183void sk_common_release(struct sock *sk)
2184{
2185 if (sk->sk_prot->destroy)
2186 sk->sk_prot->destroy(sk);
2187
2188 /*
2189 * Observation: when sock_common_release is called, processes have
2190 * no access to socket. But net still has.
2191 * Step one, detach it from networking:
2192 *
2193 * A. Remove from hash tables.
2194 */
2195
2196 sk->sk_prot->unhash(sk);
2197
2198 /*
2199 * In this point socket cannot receive new packets, but it is possible
2200 * that some packets are in flight because some CPU runs receiver and
2201 * did hash table lookup before we unhashed socket. They will achieve
2202 * receive queue and will be purged by socket destructor.
2203 *
2204 * Also we still have packets pending on receive queue and probably,
2205 * our own packets waiting in device queues. sock_destroy will drain
2206 * receive queue, but transmitted packets will delay socket destruction
2207 * until the last reference will be released.
2208 */
2209
2210 sock_orphan(sk);
2211
2212 xfrm_sk_free_policy(sk);
2213
e6848976 2214 sk_refcnt_debug_release(sk);
1da177e4
LT		 2215 sock_put(sk);
2216}
1da177e4
LT		 2217EXPORT_SYMBOL(sk_common_release);
2218
2219static DEFINE_RWLOCK(proto_list_lock);
2220static LIST_HEAD(proto_list);
2221
13ff3d6f
PE		 2222#ifdef CONFIG_PROC_FS
2223#define PROTO_INUSE_NR 64 /* should be enough for the first time */
1338d466
PE		 2224struct prot_inuse {
2225 int val[PROTO_INUSE_NR];
2226};
13ff3d6f
PE		 2227
2228static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR);
70ee1159
PE		 2229
2230#ifdef CONFIG_NET_NS
2231void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
2232{
2233 int cpu = smp_processor_id();
2234 per_cpu_ptr(net->core.inuse, cpu)->val[prot->inuse_idx] += val;
2235}
2236EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2237
2238int sock_prot_inuse_get(struct net *net, struct proto *prot)
2239{
2240 int cpu, idx = prot->inuse_idx;
2241 int res = 0;
2242
2243 for_each_possible_cpu(cpu)
2244 res += per_cpu_ptr(net->core.inuse, cpu)->val[idx];
2245
2246 return res >= 0 ? res : 0;
2247}
2248EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
2249
2c8c1e72 2250static int __net_init sock_inuse_init_net(struct net *net)
70ee1159
PE		 2251{
2252 net->core.inuse = alloc_percpu(struct prot_inuse);
2253 return net->core.inuse ? 0 : -ENOMEM;
2254}
2255
2c8c1e72 2256static void __net_exit sock_inuse_exit_net(struct net *net)
70ee1159
PE		 2257{
2258 free_percpu(net->core.inuse);
2259}
2260
2261static struct pernet_operations net_inuse_ops = {
2262 .init = sock_inuse_init_net,
2263 .exit = sock_inuse_exit_net,
2264};
2265
2266static __init int net_inuse_init(void)
2267{
2268 if (register_pernet_subsys(&net_inuse_ops))
2269 panic("Cannot initialize net inuse counters");
2270
2271 return 0;
2272}
2273
2274core_initcall(net_inuse_init);
2275#else
1338d466
PE		 2276static DEFINE_PER_CPU(struct prot_inuse, prot_inuse);
2277
c29a0bc4 2278void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
1338d466
PE		 2279{
2280 __get_cpu_var(prot_inuse).val[prot->inuse_idx] += val;
2281}
2282EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2283
c29a0bc4 2284int sock_prot_inuse_get(struct net *net, struct proto *prot)
1338d466
PE		 2285{
2286 int cpu, idx = prot->inuse_idx;
2287 int res = 0;
2288
2289 for_each_possible_cpu(cpu)
2290 res += per_cpu(prot_inuse, cpu).val[idx];
2291
2292 return res >= 0 ? res : 0;
2293}
2294EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
70ee1159 2295#endif
13ff3d6f
PE		 2296
2297static void assign_proto_idx(struct proto *prot)
2298{
2299 prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR);
2300
2301 if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) {
2302 printk(KERN_ERR "PROTO_INUSE_NR exhausted\n");
2303 return;
2304 }
2305
2306 set_bit(prot->inuse_idx, proto_inuse_idx);
2307}
2308
2309static void release_proto_idx(struct proto *prot)
2310{
2311 if (prot->inuse_idx != PROTO_INUSE_NR - 1)
2312 clear_bit(prot->inuse_idx, proto_inuse_idx);
2313}
2314#else
2315static inline void assign_proto_idx(struct proto *prot)
2316{
2317}
2318
2319static inline void release_proto_idx(struct proto *prot)
2320{
2321}
2322#endif
2323
b733c007
PE		 2324int proto_register(struct proto *prot, int alloc_slab)
2325{
1da177e4
LT		 2326 if (alloc_slab) {
2327 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0,
271b72c7
ED		 2328 SLAB_HWCACHE_ALIGN | prot->slab_flags,
2329 NULL);
1da177e4
LT		 2330
2331 if (prot->slab == NULL) {
2332 printk(KERN_CRIT "%s: Can't create sock SLAB cache!\n",
2333 prot->name);
60e7663d 2334 goto out;
1da177e4 2335 }
2e6599cb
ACM		 2336
2337 if (prot->rsk_prot != NULL) {
faf23422 2338 prot->rsk_prot->slab_name = kasprintf(GFP_KERNEL, "request_sock_%s", prot->name);
7e56b5d6 2339 if (prot->rsk_prot->slab_name == NULL)
2e6599cb
ACM		 2340 goto out_free_sock_slab;
2341
7e56b5d6 2342 prot->rsk_prot->slab = kmem_cache_create(prot->rsk_prot->slab_name,
2e6599cb 2343 prot->rsk_prot->obj_size, 0,
20c2df83 2344 SLAB_HWCACHE_ALIGN, NULL);
2e6599cb
ACM		 2345
2346 if (prot->rsk_prot->slab == NULL) {
2347 printk(KERN_CRIT "%s: Can't create request sock SLAB cache!\n",
2348 prot->name);
2349 goto out_free_request_sock_slab_name;
2350 }
2351 }
8feaf0c0 2352
6d6ee43e 2353 if (prot->twsk_prot != NULL) {
faf23422 2354 prot->twsk_prot->twsk_slab_name = kasprintf(GFP_KERNEL, "tw_sock_%s", prot->name);
8feaf0c0 2355
7e56b5d6 2356 if (prot->twsk_prot->twsk_slab_name == NULL)
8feaf0c0
ACM		 2357 goto out_free_request_sock_slab;
2358
6d6ee43e 2359 prot->twsk_prot->twsk_slab =
7e56b5d6 2360 kmem_cache_create(prot->twsk_prot->twsk_slab_name,
6d6ee43e 2361 prot->twsk_prot->twsk_obj_size,
3ab5aee7
ED		 2362 0,
2363 SLAB_HWCACHE_ALIGN |
2364 prot->slab_flags,
20c2df83 2365 NULL);
6d6ee43e 2366 if (prot->twsk_prot->twsk_slab == NULL)
8feaf0c0
ACM		 2367 goto out_free_timewait_sock_slab_name;
2368 }
1da177e4
LT		 2369 }
2370
2a278051 2371 write_lock(&proto_list_lock);
1da177e4 2372 list_add(&prot->node, &proto_list);
13ff3d6f 2373 assign_proto_idx(prot);
1da177e4 2374 write_unlock(&proto_list_lock);
b733c007
PE		 2375 return 0;
2376
8feaf0c0 2377out_free_timewait_sock_slab_name:
7e56b5d6 2378 kfree(prot->twsk_prot->twsk_slab_name);
8feaf0c0
ACM		 2379out_free_request_sock_slab:
2380 if (prot->rsk_prot && prot->rsk_prot->slab) {
2381 kmem_cache_destroy(prot->rsk_prot->slab);
2382 prot->rsk_prot->slab = NULL;
2383 }
2e6599cb 2384out_free_request_sock_slab_name:
72150e9b
DC		 2385 if (prot->rsk_prot)
2386 kfree(prot->rsk_prot->slab_name);
2e6599cb
ACM		 2387out_free_sock_slab:
2388 kmem_cache_destroy(prot->slab);
2389 prot->slab = NULL;
b733c007
PE		 2390out:
2391 return -ENOBUFS;
1da177e4 2392}
1da177e4
LT		 2393EXPORT_SYMBOL(proto_register);
2394
2395void proto_unregister(struct proto *prot)
2396{
2397 write_lock(&proto_list_lock);
13ff3d6f 2398 release_proto_idx(prot);
0a3f4358
PM		 2399 list_del(&prot->node);
2400 write_unlock(&proto_list_lock);
1da177e4
LT		 2401
2402 if (prot->slab != NULL) {
2403 kmem_cache_destroy(prot->slab);
2404 prot->slab = NULL;
2405 }
2406
2e6599cb 2407 if (prot->rsk_prot != NULL && prot->rsk_prot->slab != NULL) {
2e6599cb 2408 kmem_cache_destroy(prot->rsk_prot->slab);
7e56b5d6 2409 kfree(prot->rsk_prot->slab_name);
2e6599cb
ACM		 2410 prot->rsk_prot->slab = NULL;
2411 }
2412
6d6ee43e 2413 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) {
6d6ee43e 2414 kmem_cache_destroy(prot->twsk_prot->twsk_slab);
7e56b5d6 2415 kfree(prot->twsk_prot->twsk_slab_name);
6d6ee43e 2416 prot->twsk_prot->twsk_slab = NULL;
8feaf0c0 2417 }
1da177e4 2418}
1da177e4
LT		 2419EXPORT_SYMBOL(proto_unregister);
2420
2421#ifdef CONFIG_PROC_FS
1da177e4 2422static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
9a429c49 2423 __acquires(proto_list_lock)
1da177e4
LT		 2424{
2425 read_lock(&proto_list_lock);
60f0438a 2426 return seq_list_start_head(&proto_list, *pos);
1da177e4
LT		 2427}
2428
2429static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2430{
60f0438a 2431 return seq_list_next(v, &proto_list, pos);
1da177e4
LT		 2432}
2433
2434static void proto_seq_stop(struct seq_file *seq, void *v)
9a429c49 2435 __releases(proto_list_lock)
1da177e4
LT		 2436{
2437 read_unlock(&proto_list_lock);
2438}
2439
2440static char proto_method_implemented(const void *method)
2441{
2442 return method == NULL ? 'n' : 'y';
2443}
2444
2445static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
2446{
2447 seq_printf(seq, "%-9s %4u %6d %6d %-3s %6u %-3s %-10s "
2448 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
2449 proto->name,
2450 proto->obj_size,
14e943db 2451 sock_prot_inuse_get(seq_file_net(seq), proto),
1da177e4
LT		 2452 proto->memory_allocated != NULL ? atomic_read(proto->memory_allocated) : -1,
2453 proto->memory_pressure != NULL ? *proto->memory_pressure ? "yes" : "no" : "NI",
2454 proto->max_header,
2455 proto->slab == NULL ? "no" : "yes",
2456 module_name(proto->owner),
2457 proto_method_implemented(proto->close),
2458 proto_method_implemented(proto->connect),
2459 proto_method_implemented(proto->disconnect),
2460 proto_method_implemented(proto->accept),
2461 proto_method_implemented(proto->ioctl),
2462 proto_method_implemented(proto->init),
2463 proto_method_implemented(proto->destroy),
2464 proto_method_implemented(proto->shutdown),
2465 proto_method_implemented(proto->setsockopt),
2466 proto_method_implemented(proto->getsockopt),
2467 proto_method_implemented(proto->sendmsg),
2468 proto_method_implemented(proto->recvmsg),
2469 proto_method_implemented(proto->sendpage),
2470 proto_method_implemented(proto->bind),
2471 proto_method_implemented(proto->backlog_rcv),
2472 proto_method_implemented(proto->hash),
2473 proto_method_implemented(proto->unhash),
2474 proto_method_implemented(proto->get_port),
2475 proto_method_implemented(proto->enter_memory_pressure));
2476}
2477
2478static int proto_seq_show(struct seq_file *seq, void *v)
2479{
60f0438a 2480 if (v == &proto_list)
1da177e4
LT		 2481 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
2482 "protocol",
2483 "size",
2484 "sockets",
2485 "memory",
2486 "press",
2487 "maxhdr",
2488 "slab",
2489 "module",
2490 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
2491 else
60f0438a 2492 proto_seq_printf(seq, list_entry(v, struct proto, node));
1da177e4
LT		 2493 return 0;
2494}
2495
f690808e 2496static const struct seq_operations proto_seq_ops = {
1da177e4
LT		 2497 .start = proto_seq_start,
2498 .next = proto_seq_next,
2499 .stop = proto_seq_stop,
2500 .show = proto_seq_show,
2501};
2502
2503static int proto_seq_open(struct inode *inode, struct file *file)
2504{
14e943db
ED		 2505 return seq_open_net(inode, file, &proto_seq_ops,
2506 sizeof(struct seq_net_private));
1da177e4
LT		 2507}
2508
9a32144e 2509static const struct file_operations proto_seq_fops = {
1da177e4
LT		 2510 .owner = THIS_MODULE,
2511 .open = proto_seq_open,
2512 .read = seq_read,
2513 .llseek = seq_lseek,
14e943db
ED		 2514 .release = seq_release_net,
2515};
2516
2517static __net_init int proto_init_net(struct net *net)
2518{
2519 if (!proc_net_fops_create(net, "protocols", S_IRUGO, &proto_seq_fops))
2520 return -ENOMEM;
2521
2522 return 0;
2523}
2524
2525static __net_exit void proto_exit_net(struct net *net)
2526{
2527 proc_net_remove(net, "protocols");
2528}
2529
2530
2531static __net_initdata struct pernet_operations proto_net_ops = {
2532 .init = proto_init_net,
2533 .exit = proto_exit_net,
1da177e4
LT		 2534};
2535
2536static int __init proto_init(void)
2537{
14e943db 2538 return register_pernet_subsys(&proto_net_ops);
1da177e4
LT		 2539}
2540
2541subsys_initcall(proto_init);
2542
2543#endif /* PROC_FS */
Linux kernel - Deliverables
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