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[net-next-2.6.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}
3924773a 765EXPORT_SYMBOL_GPL(cred_to_ucred);
3f551f94 766
1da177e4
LT		 767int sock_getsockopt(struct socket *sock, int level, int optname,
768 char __user *optval, int __user *optlen)
769{
770 struct sock *sk = sock->sk;
4ec93edb 771
e71a4783 772 union {
4ec93edb
YH		 773 int val;
774 struct linger ling;
1da177e4
LT		 775 struct timeval tm;
776 } v;
4ec93edb 777
4d0392be 778 int lv = sizeof(int);
1da177e4 779 int len;
4ec93edb 780
e71a4783 781 if (get_user(len, optlen))
4ec93edb 782 return -EFAULT;
e71a4783 783 if (len < 0)
1da177e4 784 return -EINVAL;
4ec93edb 785
50fee1de 786 memset(&v, 0, sizeof(v));
df0bca04 787
2a91525c 788 switch (optname) {
e71a4783
SH		 789 case SO_DEBUG:
790 v.val = sock_flag(sk, SOCK_DBG);
791 break;
792
793 case SO_DONTROUTE:
794 v.val = sock_flag(sk, SOCK_LOCALROUTE);
795 break;
796
797 case SO_BROADCAST:
798 v.val = !!sock_flag(sk, SOCK_BROADCAST);
799 break;
800
801 case SO_SNDBUF:
802 v.val = sk->sk_sndbuf;
803 break;
804
805 case SO_RCVBUF:
806 v.val = sk->sk_rcvbuf;
807 break;
808
809 case SO_REUSEADDR:
810 v.val = sk->sk_reuse;
811 break;
812
813 case SO_KEEPALIVE:
814 v.val = !!sock_flag(sk, SOCK_KEEPOPEN);
815 break;
816
817 case SO_TYPE:
818 v.val = sk->sk_type;
819 break;
820
49c794e9
JE		 821 case SO_PROTOCOL:
822 v.val = sk->sk_protocol;
823 break;
824
0d6038ee
JE		 825 case SO_DOMAIN:
826 v.val = sk->sk_family;
827 break;
828
e71a4783
SH		 829 case SO_ERROR:
830 v.val = -sock_error(sk);
2a91525c 831 if (v.val == 0)
e71a4783
SH		 832 v.val = xchg(&sk->sk_err_soft, 0);
833 break;
834
835 case SO_OOBINLINE:
836 v.val = !!sock_flag(sk, SOCK_URGINLINE);
837 break;
838
839 case SO_NO_CHECK:
840 v.val = sk->sk_no_check;
841 break;
842
843 case SO_PRIORITY:
844 v.val = sk->sk_priority;
845 break;
846
847 case SO_LINGER:
848 lv = sizeof(v.ling);
849 v.ling.l_onoff = !!sock_flag(sk, SOCK_LINGER);
850 v.ling.l_linger = sk->sk_lingertime / HZ;
851 break;
852
853 case SO_BSDCOMPAT:
854 sock_warn_obsolete_bsdism("getsockopt");
855 break;
856
857 case SO_TIMESTAMP:
92f37fd2
ED		 858 v.val = sock_flag(sk, SOCK_RCVTSTAMP) &&
859 !sock_flag(sk, SOCK_RCVTSTAMPNS);
860 break;
861
862 case SO_TIMESTAMPNS:
863 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS);
e71a4783
SH		 864 break;
865
20d49473
PO		 866 case SO_TIMESTAMPING:
867 v.val = 0;
868 if (sock_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE))
869 v.val |= SOF_TIMESTAMPING_TX_HARDWARE;
870 if (sock_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE))
871 v.val |= SOF_TIMESTAMPING_TX_SOFTWARE;
872 if (sock_flag(sk, SOCK_TIMESTAMPING_RX_HARDWARE))
873 v.val |= SOF_TIMESTAMPING_RX_HARDWARE;
874 if (sock_flag(sk, SOCK_TIMESTAMPING_RX_SOFTWARE))
875 v.val |= SOF_TIMESTAMPING_RX_SOFTWARE;
876 if (sock_flag(sk, SOCK_TIMESTAMPING_SOFTWARE))
877 v.val |= SOF_TIMESTAMPING_SOFTWARE;
878 if (sock_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE))
879 v.val |= SOF_TIMESTAMPING_SYS_HARDWARE;
880 if (sock_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE))
881 v.val |= SOF_TIMESTAMPING_RAW_HARDWARE;
882 break;
883
e71a4783 884 case SO_RCVTIMEO:
2a91525c 885 lv = sizeof(struct timeval);
e71a4783
SH		 886 if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) {
887 v.tm.tv_sec = 0;
888 v.tm.tv_usec = 0;
889 } else {
890 v.tm.tv_sec = sk->sk_rcvtimeo / HZ;
891 v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ;
892 }
893 break;
894
895 case SO_SNDTIMEO:
2a91525c 896 lv = sizeof(struct timeval);
e71a4783
SH		 897 if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) {
898 v.tm.tv_sec = 0;
899 v.tm.tv_usec = 0;
900 } else {
901 v.tm.tv_sec = sk->sk_sndtimeo / HZ;
902 v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ;
903 }
904 break;
1da177e4 905
e71a4783
SH		 906 case SO_RCVLOWAT:
907 v.val = sk->sk_rcvlowat;
908 break;
1da177e4 909
e71a4783 910 case SO_SNDLOWAT:
2a91525c 911 v.val = 1;
e71a4783 912 break;
1da177e4 913
e71a4783
SH		 914 case SO_PASSCRED:
915 v.val = test_bit(SOCK_PASSCRED, &sock->flags) ? 1 : 0;
916 break;
1da177e4 917
e71a4783 918 case SO_PEERCRED:
109f6e39
EB		 919 {
920 struct ucred peercred;
921 if (len > sizeof(peercred))
922 len = sizeof(peercred);
923 cred_to_ucred(sk->sk_peer_pid, sk->sk_peer_cred, &peercred);
924 if (copy_to_user(optval, &peercred, len))
e71a4783
SH		 925 return -EFAULT;
926 goto lenout;
109f6e39 927 }
1da177e4 928
e71a4783
SH		 929 case SO_PEERNAME:
930 {
931 char address[128];
932
933 if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2))
934 return -ENOTCONN;
935 if (lv < len)
936 return -EINVAL;
937 if (copy_to_user(optval, address, len))
938 return -EFAULT;
939 goto lenout;
940 }
1da177e4 941
e71a4783
SH		 942 /* Dubious BSD thing... Probably nobody even uses it, but
943 * the UNIX standard wants it for whatever reason... -DaveM
944 */
945 case SO_ACCEPTCONN:
946 v.val = sk->sk_state == TCP_LISTEN;
947 break;
1da177e4 948
e71a4783
SH		 949 case SO_PASSSEC:
950 v.val = test_bit(SOCK_PASSSEC, &sock->flags) ? 1 : 0;
951 break;
877ce7c1 952
e71a4783
SH		 953 case SO_PEERSEC:
954 return security_socket_getpeersec_stream(sock, optval, optlen, len);
1da177e4 955
4a19ec58
LAT		 956 case SO_MARK:
957 v.val = sk->sk_mark;
958 break;
959
3b885787
NH		 960 case SO_RXQ_OVFL:
961 v.val = !!sock_flag(sk, SOCK_RXQ_OVFL);
962 break;
963
e71a4783
SH		 964 default:
965 return -ENOPROTOOPT;
1da177e4 966 }
e71a4783 967
1da177e4
LT		 968 if (len > lv)
969 len = lv;
970 if (copy_to_user(optval, &v, len))
971 return -EFAULT;
972lenout:
4ec93edb
YH		 973 if (put_user(len, optlen))
974 return -EFAULT;
975 return 0;
1da177e4
LT		 976}
977
a5b5bb9a
IM		 978/*
979 * Initialize an sk_lock.
980 *
981 * (We also register the sk_lock with the lock validator.)
982 */
b6f99a21 983static inline void sock_lock_init(struct sock *sk)
a5b5bb9a 984{
ed07536e
PZ		 985 sock_lock_init_class_and_name(sk,
986 af_family_slock_key_strings[sk->sk_family],
987 af_family_slock_keys + sk->sk_family,
988 af_family_key_strings[sk->sk_family],
989 af_family_keys + sk->sk_family);
a5b5bb9a
IM		 990}
991
4dc6dc71
ED		 992/*
993 * Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet,
994 * even temporarly, because of RCU lookups. sk_node should also be left as is.
995 */
f1a6c4da
PE		 996static void sock_copy(struct sock *nsk, const struct sock *osk)
997{
998#ifdef CONFIG_SECURITY_NETWORK
999 void *sptr = nsk->sk_security;
1000#endif
4dc6dc71 1001 BUILD_BUG_ON(offsetof(struct sock, sk_copy_start) !=
e022f0b4
KK		 1002 sizeof(osk->sk_node) + sizeof(osk->sk_refcnt) +
1003 sizeof(osk->sk_tx_queue_mapping));
4dc6dc71
ED		 1004 memcpy(&nsk->sk_copy_start, &osk->sk_copy_start,
1005 osk->sk_prot->obj_size - offsetof(struct sock, sk_copy_start));
f1a6c4da
PE		 1006#ifdef CONFIG_SECURITY_NETWORK
1007 nsk->sk_security = sptr;
1008 security_sk_clone(osk, nsk);
1009#endif
1010}
1011
2e4afe7b
PE		 1012static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority,
1013 int family)
c308c1b2
PE		 1014{
1015 struct sock *sk;
1016 struct kmem_cache *slab;
1017
1018 slab = prot->slab;
e912b114
ED		 1019 if (slab != NULL) {
1020 sk = kmem_cache_alloc(slab, priority & ~__GFP_ZERO);
1021 if (!sk)
1022 return sk;
1023 if (priority & __GFP_ZERO) {
1024 /*
1025 * caches using SLAB_DESTROY_BY_RCU should let
1026 * sk_node.next un-modified. Special care is taken
1027 * when initializing object to zero.
1028 */
1029 if (offsetof(struct sock, sk_node.next) != 0)
1030 memset(sk, 0, offsetof(struct sock, sk_node.next));
1031 memset(&sk->sk_node.pprev, 0,
1032 prot->obj_size - offsetof(struct sock,
1033 sk_node.pprev));
1034 }
1035 }
c308c1b2
PE		 1036 else
1037 sk = kmalloc(prot->obj_size, priority);
1038
2e4afe7b 1039 if (sk != NULL) {
a98b65a3
VN		 1040 kmemcheck_annotate_bitfield(sk, flags);
1041
2e4afe7b
PE		 1042 if (security_sk_alloc(sk, family, priority))
1043 goto out_free;
1044
1045 if (!try_module_get(prot->owner))
1046 goto out_free_sec;
e022f0b4 1047 sk_tx_queue_clear(sk);
2e4afe7b
PE		 1048 }
1049
c308c1b2 1050 return sk;
2e4afe7b
PE		 1051
1052out_free_sec:
1053 security_sk_free(sk);
1054out_free:
1055 if (slab != NULL)
1056 kmem_cache_free(slab, sk);
1057 else
1058 kfree(sk);
1059 return NULL;
c308c1b2
PE		 1060}
1061
1062static void sk_prot_free(struct proto *prot, struct sock *sk)
1063{
1064 struct kmem_cache *slab;
2e4afe7b 1065 struct module *owner;
c308c1b2 1066
2e4afe7b 1067 owner = prot->owner;
c308c1b2 1068 slab = prot->slab;
2e4afe7b
PE		 1069
1070 security_sk_free(sk);
c308c1b2
PE		 1071 if (slab != NULL)
1072 kmem_cache_free(slab, sk);
1073 else
1074 kfree(sk);
2e4afe7b 1075 module_put(owner);
c308c1b2
PE		 1076}
1077
f8451725
HX		 1078#ifdef CONFIG_CGROUPS
1079void sock_update_classid(struct sock *sk)
1080{
1081 u32 classid = task_cls_classid(current);
1082
1083 if (classid && classid != sk->sk_classid)
1084 sk->sk_classid = classid;
1085}
82862742 1086EXPORT_SYMBOL(sock_update_classid);
f8451725
HX		 1087#endif
1088
1da177e4
LT		 1089/**
1090 * sk_alloc - All socket objects are allocated here
c4ea43c5 1091 * @net: the applicable net namespace
4dc3b16b
PP		 1092 * @family: protocol family
1093 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1094 * @prot: struct proto associated with this new sock instance
1da177e4 1095 */
1b8d7ae4 1096struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
6257ff21 1097 struct proto *prot)
1da177e4 1098{
c308c1b2 1099 struct sock *sk;
1da177e4 1100
154adbc8 1101 sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family);
1da177e4 1102 if (sk) {
154adbc8
PE		 1103 sk->sk_family = family;
1104 /*
1105 * See comment in struct sock definition to understand
1106 * why we need sk_prot_creator -acme
1107 */
1108 sk->sk_prot = sk->sk_prot_creator = prot;
1109 sock_lock_init(sk);
3b1e0a65 1110 sock_net_set(sk, get_net(net));
d66ee058 1111 atomic_set(&sk->sk_wmem_alloc, 1);
f8451725
HX		 1112
1113 sock_update_classid(sk);
1da177e4 1114 }
a79af59e 1115
2e4afe7b 1116 return sk;
1da177e4 1117}
2a91525c 1118EXPORT_SYMBOL(sk_alloc);
1da177e4 1119
2b85a34e 1120static void __sk_free(struct sock *sk)
1da177e4
LT		 1121{
1122 struct sk_filter *filter;
1da177e4
LT		 1123
1124 if (sk->sk_destruct)
1125 sk->sk_destruct(sk);
1126
a898def2
PM		 1127 filter = rcu_dereference_check(sk->sk_filter,
1128 atomic_read(&sk->sk_wmem_alloc) == 0);
1da177e4 1129 if (filter) {
309dd5fc 1130 sk_filter_uncharge(sk, filter);
fda9ef5d 1131 rcu_assign_pointer(sk->sk_filter, NULL);
1da177e4
LT		 1132 }
1133
20d49473
PO		 1134 sock_disable_timestamp(sk, SOCK_TIMESTAMP);
1135 sock_disable_timestamp(sk, SOCK_TIMESTAMPING_RX_SOFTWARE);
1da177e4
LT		 1136
1137 if (atomic_read(&sk->sk_omem_alloc))
1138 printk(KERN_DEBUG "%s: optmem leakage (%d bytes) detected.\n",
0dc47877 1139 __func__, atomic_read(&sk->sk_omem_alloc));
1da177e4 1140
109f6e39
EB		 1141 if (sk->sk_peer_cred)
1142 put_cred(sk->sk_peer_cred);
1143 put_pid(sk->sk_peer_pid);
3b1e0a65 1144 put_net(sock_net(sk));
c308c1b2 1145 sk_prot_free(sk->sk_prot_creator, sk);
1da177e4 1146}
2b85a34e
ED		 1147
1148void sk_free(struct sock *sk)
1149{
1150 /*
1151 * We substract one from sk_wmem_alloc and can know if
1152 * some packets are still in some tx queue.
1153 * If not null, sock_wfree() will call __sk_free(sk) later
1154 */
1155 if (atomic_dec_and_test(&sk->sk_wmem_alloc))
1156 __sk_free(sk);
1157}
2a91525c 1158EXPORT_SYMBOL(sk_free);
1da177e4 1159
edf02087
DL		 1160/*
1161 * Last sock_put should drop referrence to sk->sk_net. It has already
1162 * been dropped in sk_change_net. Taking referrence to stopping namespace
1163 * is not an option.
1164 * Take referrence to a socket to remove it from hash _alive_ and after that
1165 * destroy it in the context of init_net.
1166 */
1167void sk_release_kernel(struct sock *sk)
1168{
1169 if (sk == NULL || sk->sk_socket == NULL)
1170 return;
1171
1172 sock_hold(sk);
1173 sock_release(sk->sk_socket);
65a18ec5 1174 release_net(sock_net(sk));
3b1e0a65 1175 sock_net_set(sk, get_net(&init_net));
edf02087
DL		 1176 sock_put(sk);
1177}
45af1754 1178EXPORT_SYMBOL(sk_release_kernel);
edf02087 1179
dd0fc66f 1180struct sock *sk_clone(const struct sock *sk, const gfp_t priority)
87d11ceb 1181{
8fd1d178 1182 struct sock *newsk;
87d11ceb 1183
8fd1d178 1184 newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family);
87d11ceb
ACM		 1185 if (newsk != NULL) {
1186 struct sk_filter *filter;
1187
892c141e 1188 sock_copy(newsk, sk);
87d11ceb
ACM		 1189
1190 /* SANITY */
3b1e0a65 1191 get_net(sock_net(newsk));
87d11ceb
ACM		 1192 sk_node_init(&newsk->sk_node);
1193 sock_lock_init(newsk);
1194 bh_lock_sock(newsk);
fa438ccf 1195 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL;
8eae939f 1196 newsk->sk_backlog.len = 0;
87d11ceb
ACM		 1197
1198 atomic_set(&newsk->sk_rmem_alloc, 0);
2b85a34e
ED		 1199 /*
1200 * sk_wmem_alloc set to one (see sk_free() and sock_wfree())
1201 */
1202 atomic_set(&newsk->sk_wmem_alloc, 1);
87d11ceb
ACM		 1203 atomic_set(&newsk->sk_omem_alloc, 0);
1204 skb_queue_head_init(&newsk->sk_receive_queue);
1205 skb_queue_head_init(&newsk->sk_write_queue);
97fc2f08
CL		 1206#ifdef CONFIG_NET_DMA
1207 skb_queue_head_init(&newsk->sk_async_wait_queue);
1208#endif
87d11ceb 1209
b6c6712a 1210 spin_lock_init(&newsk->sk_dst_lock);
87d11ceb 1211 rwlock_init(&newsk->sk_callback_lock);
443aef0e
PZ		 1212 lockdep_set_class_and_name(&newsk->sk_callback_lock,
1213 af_callback_keys + newsk->sk_family,
1214 af_family_clock_key_strings[newsk->sk_family]);
87d11ceb
ACM		 1215
1216 newsk->sk_dst_cache = NULL;
1217 newsk->sk_wmem_queued = 0;
1218 newsk->sk_forward_alloc = 0;
1219 newsk->sk_send_head = NULL;
87d11ceb
ACM		 1220 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
1221
1222 sock_reset_flag(newsk, SOCK_DONE);
1223 skb_queue_head_init(&newsk->sk_error_queue);
1224
1225 filter = newsk->sk_filter;
1226 if (filter != NULL)
1227 sk_filter_charge(newsk, filter);
1228
1229 if (unlikely(xfrm_sk_clone_policy(newsk))) {
1230 /* It is still raw copy of parent, so invalidate
1231 * destructor and make plain sk_free() */
1232 newsk->sk_destruct = NULL;
1233 sk_free(newsk);
1234 newsk = NULL;
1235 goto out;
1236 }
1237
1238 newsk->sk_err = 0;
1239 newsk->sk_priority = 0;
4dc6dc71
ED		 1240 /*
1241 * Before updating sk_refcnt, we must commit prior changes to memory
1242 * (Documentation/RCU/rculist_nulls.txt for details)
1243 */
1244 smp_wmb();
87d11ceb
ACM		 1245 atomic_set(&newsk->sk_refcnt, 2);
1246
1247 /*
1248 * Increment the counter in the same struct proto as the master
1249 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
1250 * is the same as sk->sk_prot->socks, as this field was copied
1251 * with memcpy).
1252 *
1253 * This _changes_ the previous behaviour, where
1254 * tcp_create_openreq_child always was incrementing the
1255 * equivalent to tcp_prot->socks (inet_sock_nr), so this have
1256 * to be taken into account in all callers. -acme
1257 */
1258 sk_refcnt_debug_inc(newsk);
972692e0 1259 sk_set_socket(newsk, NULL);
43815482 1260 newsk->sk_wq = NULL;
87d11ceb
ACM		 1261
1262 if (newsk->sk_prot->sockets_allocated)
1748376b 1263 percpu_counter_inc(newsk->sk_prot->sockets_allocated);
704da560
OP		 1264
1265 if (sock_flag(newsk, SOCK_TIMESTAMP) ||
1266 sock_flag(newsk, SOCK_TIMESTAMPING_RX_SOFTWARE))
1267 net_enable_timestamp();
87d11ceb
ACM		 1268 }
1269out:
1270 return newsk;
1271}
87d11ceb
ACM		 1272EXPORT_SYMBOL_GPL(sk_clone);
1273
9958089a
AK		 1274void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
1275{
1276 __sk_dst_set(sk, dst);
1277 sk->sk_route_caps = dst->dev->features;
1278 if (sk->sk_route_caps & NETIF_F_GSO)
4fcd6b99 1279 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE;
a465419b 1280 sk->sk_route_caps &= ~sk->sk_route_nocaps;
9958089a 1281 if (sk_can_gso(sk)) {
82cc1a7a 1282 if (dst->header_len) {
9958089a 1283 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
82cc1a7a 1284 } else {
9958089a 1285 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
82cc1a7a
PWJ		 1286 sk->sk_gso_max_size = dst->dev->gso_max_size;
1287 }
9958089a
AK		 1288 }
1289}
1290EXPORT_SYMBOL_GPL(sk_setup_caps);
1291
1da177e4
LT		 1292void __init sk_init(void)
1293{
4481374c 1294 if (totalram_pages <= 4096) {
1da177e4
LT		 1295 sysctl_wmem_max = 32767;
1296 sysctl_rmem_max = 32767;
1297 sysctl_wmem_default = 32767;
1298 sysctl_rmem_default = 32767;
4481374c 1299 } else if (totalram_pages >= 131072) {
1da177e4
LT		 1300 sysctl_wmem_max = 131071;
1301 sysctl_rmem_max = 131071;
1302 }
1303}
1304
1305/*
1306 * Simple resource managers for sockets.
1307 */
1308
1309
4ec93edb
YH		 1310/*
1311 * Write buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1312 */
1313void sock_wfree(struct sk_buff *skb)
1314{
1315 struct sock *sk = skb->sk;
d99927f4 1316 unsigned int len = skb->truesize;
1da177e4 1317
d99927f4
ED		 1318 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) {
1319 /*
1320 * Keep a reference on sk_wmem_alloc, this will be released
1321 * after sk_write_space() call
1322 */
1323 atomic_sub(len - 1, &sk->sk_wmem_alloc);
1da177e4 1324 sk->sk_write_space(sk);
d99927f4
ED		 1325 len = 1;
1326 }
2b85a34e 1327 /*
d99927f4
ED		 1328 * if sk_wmem_alloc reaches 0, we must finish what sk_free()
1329 * could not do because of in-flight packets
2b85a34e 1330 */
d99927f4 1331 if (atomic_sub_and_test(len, &sk->sk_wmem_alloc))
2b85a34e 1332 __sk_free(sk);
1da177e4 1333}
2a91525c 1334EXPORT_SYMBOL(sock_wfree);
1da177e4 1335
4ec93edb
YH		 1336/*
1337 * Read buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1338 */
1339void sock_rfree(struct sk_buff *skb)
1340{
1341 struct sock *sk = skb->sk;
1342
1343 atomic_sub(skb->truesize, &sk->sk_rmem_alloc);
3ab224be 1344 sk_mem_uncharge(skb->sk, skb->truesize);
1da177e4 1345}
2a91525c 1346EXPORT_SYMBOL(sock_rfree);
1da177e4
LT		 1347
1348
1349int sock_i_uid(struct sock *sk)
1350{
1351 int uid;
1352
1353 read_lock(&sk->sk_callback_lock);
1354 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : 0;
1355 read_unlock(&sk->sk_callback_lock);
1356 return uid;
1357}
2a91525c 1358EXPORT_SYMBOL(sock_i_uid);
1da177e4
LT		 1359
1360unsigned long sock_i_ino(struct sock *sk)
1361{
1362 unsigned long ino;
1363
1364 read_lock(&sk->sk_callback_lock);
1365 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
1366 read_unlock(&sk->sk_callback_lock);
1367 return ino;
1368}
2a91525c 1369EXPORT_SYMBOL(sock_i_ino);
1da177e4
LT		 1370
1371/*
1372 * Allocate a skb from the socket's send buffer.
1373 */
86a76caf 1374struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
dd0fc66f 1375 gfp_t priority)
1da177e4
LT		 1376{
1377 if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
2a91525c 1378 struct sk_buff *skb = alloc_skb(size, priority);
1da177e4
LT		 1379 if (skb) {
1380 skb_set_owner_w(skb, sk);
1381 return skb;
1382 }
1383 }
1384 return NULL;
1385}
2a91525c 1386EXPORT_SYMBOL(sock_wmalloc);
1da177e4
LT		 1387
1388/*
1389 * Allocate a skb from the socket's receive buffer.
4ec93edb 1390 */
86a76caf 1391struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force,
dd0fc66f 1392 gfp_t priority)
1da177e4
LT		 1393{
1394 if (force || atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) {
1395 struct sk_buff *skb = alloc_skb(size, priority);
1396 if (skb) {
1397 skb_set_owner_r(skb, sk);
1398 return skb;
1399 }
1400 }
1401 return NULL;
1402}
1403
4ec93edb 1404/*
1da177e4 1405 * Allocate a memory block from the socket's option memory buffer.
4ec93edb 1406 */
dd0fc66f 1407void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
1da177e4
LT		 1408{
1409 if ((unsigned)size <= sysctl_optmem_max &&
1410 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) {
1411 void *mem;
1412 /* First do the add, to avoid the race if kmalloc
4ec93edb 1413 * might sleep.
1da177e4
LT		 1414 */
1415 atomic_add(size, &sk->sk_omem_alloc);
1416 mem = kmalloc(size, priority);
1417 if (mem)
1418 return mem;
1419 atomic_sub(size, &sk->sk_omem_alloc);
1420 }
1421 return NULL;
1422}
2a91525c 1423EXPORT_SYMBOL(sock_kmalloc);
1da177e4
LT		 1424
1425/*
1426 * Free an option memory block.
1427 */
1428void sock_kfree_s(struct sock *sk, void *mem, int size)
1429{
1430 kfree(mem);
1431 atomic_sub(size, &sk->sk_omem_alloc);
1432}
2a91525c 1433EXPORT_SYMBOL(sock_kfree_s);
1da177e4
LT		 1434
1435/* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
1436 I think, these locks should be removed for datagram sockets.
1437 */
2a91525c 1438static long sock_wait_for_wmem(struct sock *sk, long timeo)
1da177e4
LT		 1439{
1440 DEFINE_WAIT(wait);
1441
1442 clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1443 for (;;) {
1444 if (!timeo)
1445 break;
1446 if (signal_pending(current))
1447 break;
1448 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
aa395145 1449 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1da177e4
LT		 1450 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf)
1451 break;
1452 if (sk->sk_shutdown & SEND_SHUTDOWN)
1453 break;
1454 if (sk->sk_err)
1455 break;
1456 timeo = schedule_timeout(timeo);
1457 }
aa395145 1458 finish_wait(sk_sleep(sk), &wait);
1da177e4
LT		 1459 return timeo;
1460}
1461
1462
1463/*
1464 * Generic send/receive buffer handlers
1465 */
1466
4cc7f68d
HX		 1467struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len,
1468 unsigned long data_len, int noblock,
1469 int *errcode)
1da177e4
LT		 1470{
1471 struct sk_buff *skb;
7d877f3b 1472 gfp_t gfp_mask;
1da177e4
LT		 1473 long timeo;
1474 int err;
1475
1476 gfp_mask = sk->sk_allocation;
1477 if (gfp_mask & __GFP_WAIT)
1478 gfp_mask |= __GFP_REPEAT;
1479
1480 timeo = sock_sndtimeo(sk, noblock);
1481 while (1) {
1482 err = sock_error(sk);
1483 if (err != 0)
1484 goto failure;
1485
1486 err = -EPIPE;
1487 if (sk->sk_shutdown & SEND_SHUTDOWN)
1488 goto failure;
1489
1490 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
db38c179 1491 skb = alloc_skb(header_len, gfp_mask);
1da177e4
LT		 1492 if (skb) {
1493 int npages;
1494 int i;
1495
1496 /* No pages, we're done... */
1497 if (!data_len)
1498 break;
1499
1500 npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
1501 skb->truesize += data_len;
1502 skb_shinfo(skb)->nr_frags = npages;
1503 for (i = 0; i < npages; i++) {
1504 struct page *page;
1505 skb_frag_t *frag;
1506
1507 page = alloc_pages(sk->sk_allocation, 0);
1508 if (!page) {
1509 err = -ENOBUFS;
1510 skb_shinfo(skb)->nr_frags = i;
1511 kfree_skb(skb);
1512 goto failure;
1513 }
1514
1515 frag = &skb_shinfo(skb)->frags[i];
1516 frag->page = page;
1517 frag->page_offset = 0;
1518 frag->size = (data_len >= PAGE_SIZE ?
1519 PAGE_SIZE :
1520 data_len);
1521 data_len -= PAGE_SIZE;
1522 }
1523
1524 /* Full success... */
1525 break;
1526 }
1527 err = -ENOBUFS;
1528 goto failure;
1529 }
1530 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1531 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1532 err = -EAGAIN;
1533 if (!timeo)
1534 goto failure;
1535 if (signal_pending(current))
1536 goto interrupted;
1537 timeo = sock_wait_for_wmem(sk, timeo);
1538 }
1539
1540 skb_set_owner_w(skb, sk);
1541 return skb;
1542
1543interrupted:
1544 err = sock_intr_errno(timeo);
1545failure:
1546 *errcode = err;
1547 return NULL;
1548}
4cc7f68d 1549EXPORT_SYMBOL(sock_alloc_send_pskb);
1da177e4 1550
4ec93edb 1551struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
1da177e4
LT		 1552 int noblock, int *errcode)
1553{
1554 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode);
1555}
2a91525c 1556EXPORT_SYMBOL(sock_alloc_send_skb);
1da177e4
LT		 1557
1558static void __lock_sock(struct sock *sk)
1559{
1560 DEFINE_WAIT(wait);
1561
e71a4783 1562 for (;;) {
1da177e4
LT		 1563 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
1564 TASK_UNINTERRUPTIBLE);
1565 spin_unlock_bh(&sk->sk_lock.slock);
1566 schedule();
1567 spin_lock_bh(&sk->sk_lock.slock);
e71a4783 1568 if (!sock_owned_by_user(sk))
1da177e4
LT		 1569 break;
1570 }
1571 finish_wait(&sk->sk_lock.wq, &wait);
1572}
1573
1574static void __release_sock(struct sock *sk)
1575{
1576 struct sk_buff *skb = sk->sk_backlog.head;
1577
1578 do {
1579 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
1580 bh_unlock_sock(sk);
1581
1582 do {
1583 struct sk_buff *next = skb->next;
1584
7fee226a 1585 WARN_ON_ONCE(skb_dst_is_noref(skb));
1da177e4 1586 skb->next = NULL;
c57943a1 1587 sk_backlog_rcv(sk, skb);
1da177e4
LT		 1588
1589 /*
1590 * We are in process context here with softirqs
1591 * disabled, use cond_resched_softirq() to preempt.
1592 * This is safe to do because we've taken the backlog
1593 * queue private:
1594 */
1595 cond_resched_softirq();
1596
1597 skb = next;
1598 } while (skb != NULL);
1599
1600 bh_lock_sock(sk);
e71a4783 1601 } while ((skb = sk->sk_backlog.head) != NULL);
8eae939f
ZY		 1602
1603 /*
1604 * Doing the zeroing here guarantee we can not loop forever
1605 * while a wild producer attempts to flood us.
1606 */
1607 sk->sk_backlog.len = 0;
1da177e4
LT		 1608}
1609
1610/**
1611 * sk_wait_data - wait for data to arrive at sk_receive_queue
4dc3b16b
PP		 1612 * @sk: sock to wait on
1613 * @timeo: for how long
1da177e4
LT		 1614 *
1615 * Now socket state including sk->sk_err is changed only under lock,
1616 * hence we may omit checks after joining wait queue.
1617 * We check receive queue before schedule() only as optimization;
1618 * it is very likely that release_sock() added new data.
1619 */
1620int sk_wait_data(struct sock *sk, long *timeo)
1621{
1622 int rc;
1623 DEFINE_WAIT(wait);
1624
aa395145 1625 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1da177e4
LT		 1626 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1627 rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue));
1628 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
aa395145 1629 finish_wait(sk_sleep(sk), &wait);
1da177e4
LT		 1630 return rc;
1631}
1da177e4
LT		 1632EXPORT_SYMBOL(sk_wait_data);
1633
3ab224be
HA		 1634/**
1635 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated
1636 * @sk: socket
1637 * @size: memory size to allocate
1638 * @kind: allocation type
1639 *
1640 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means
1641 * rmem allocation. This function assumes that protocols which have
1642 * memory_pressure use sk_wmem_queued as write buffer accounting.
1643 */
1644int __sk_mem_schedule(struct sock *sk, int size, int kind)
1645{
1646 struct proto *prot = sk->sk_prot;
1647 int amt = sk_mem_pages(size);
1648 int allocated;
1649
1650 sk->sk_forward_alloc += amt * SK_MEM_QUANTUM;
1651 allocated = atomic_add_return(amt, prot->memory_allocated);
1652
1653 /* Under limit. */
1654 if (allocated <= prot->sysctl_mem[0]) {
1655 if (prot->memory_pressure && *prot->memory_pressure)
1656 *prot->memory_pressure = 0;
1657 return 1;
1658 }
1659
1660 /* Under pressure. */
1661 if (allocated > prot->sysctl_mem[1])
1662 if (prot->enter_memory_pressure)
5c52ba17 1663 prot->enter_memory_pressure(sk);
3ab224be
HA		 1664
1665 /* Over hard limit. */
1666 if (allocated > prot->sysctl_mem[2])
1667 goto suppress_allocation;
1668
1669 /* guarantee minimum buffer size under pressure */
1670 if (kind == SK_MEM_RECV) {
1671 if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0])
1672 return 1;
1673 } else { /* SK_MEM_SEND */
1674 if (sk->sk_type == SOCK_STREAM) {
1675 if (sk->sk_wmem_queued < prot->sysctl_wmem[0])
1676 return 1;
1677 } else if (atomic_read(&sk->sk_wmem_alloc) <
1678 prot->sysctl_wmem[0])
1679 return 1;
1680 }
1681
1682 if (prot->memory_pressure) {
1748376b
ED		 1683 int alloc;
1684
1685 if (!*prot->memory_pressure)
1686 return 1;
1687 alloc = percpu_counter_read_positive(prot->sockets_allocated);
1688 if (prot->sysctl_mem[2] > alloc *
3ab224be
HA		 1689 sk_mem_pages(sk->sk_wmem_queued +
1690 atomic_read(&sk->sk_rmem_alloc) +
1691 sk->sk_forward_alloc))
1692 return 1;
1693 }
1694
1695suppress_allocation:
1696
1697 if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) {
1698 sk_stream_moderate_sndbuf(sk);
1699
1700 /* Fail only if socket is _under_ its sndbuf.
1701 * In this case we cannot block, so that we have to fail.
1702 */
1703 if (sk->sk_wmem_queued + size >= sk->sk_sndbuf)
1704 return 1;
1705 }
1706
1707 /* Alas. Undo changes. */
1708 sk->sk_forward_alloc -= amt * SK_MEM_QUANTUM;
1709 atomic_sub(amt, prot->memory_allocated);
1710 return 0;
1711}
3ab224be
HA		 1712EXPORT_SYMBOL(__sk_mem_schedule);
1713
1714/**
1715 * __sk_reclaim - reclaim memory_allocated
1716 * @sk: socket
1717 */
1718void __sk_mem_reclaim(struct sock *sk)
1719{
1720 struct proto *prot = sk->sk_prot;
1721
680a5a50 1722 atomic_sub(sk->sk_forward_alloc >> SK_MEM_QUANTUM_SHIFT,
3ab224be
HA		 1723 prot->memory_allocated);
1724 sk->sk_forward_alloc &= SK_MEM_QUANTUM - 1;
1725
1726 if (prot->memory_pressure && *prot->memory_pressure &&
1727 (atomic_read(prot->memory_allocated) < prot->sysctl_mem[0]))
1728 *prot->memory_pressure = 0;
1729}
3ab224be
HA		 1730EXPORT_SYMBOL(__sk_mem_reclaim);
1731
1732
1da177e4
LT		 1733/*
1734 * Set of default routines for initialising struct proto_ops when
1735 * the protocol does not support a particular function. In certain
1736 * cases where it makes no sense for a protocol to have a "do nothing"
1737 * function, some default processing is provided.
1738 */
1739
1740int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
1741{
1742 return -EOPNOTSUPP;
1743}
2a91525c 1744EXPORT_SYMBOL(sock_no_bind);
1da177e4 1745
4ec93edb 1746int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 1747 int len, int flags)
1748{
1749 return -EOPNOTSUPP;
1750}
2a91525c 1751EXPORT_SYMBOL(sock_no_connect);
1da177e4
LT		 1752
1753int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
1754{
1755 return -EOPNOTSUPP;
1756}
2a91525c 1757EXPORT_SYMBOL(sock_no_socketpair);
1da177e4
LT		 1758
1759int sock_no_accept(struct socket *sock, struct socket *newsock, int flags)
1760{
1761 return -EOPNOTSUPP;
1762}
2a91525c 1763EXPORT_SYMBOL(sock_no_accept);
1da177e4 1764
4ec93edb 1765int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 1766 int *len, int peer)
1767{
1768 return -EOPNOTSUPP;
1769}
2a91525c 1770EXPORT_SYMBOL(sock_no_getname);
1da177e4 1771
2a91525c 1772unsigned int sock_no_poll(struct file *file, struct socket *sock, poll_table *pt)
1da177e4
LT		 1773{
1774 return 0;
1775}
2a91525c 1776EXPORT_SYMBOL(sock_no_poll);
1da177e4
LT		 1777
1778int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1779{
1780 return -EOPNOTSUPP;
1781}
2a91525c 1782EXPORT_SYMBOL(sock_no_ioctl);
1da177e4
LT		 1783
1784int sock_no_listen(struct socket *sock, int backlog)
1785{
1786 return -EOPNOTSUPP;
1787}
2a91525c 1788EXPORT_SYMBOL(sock_no_listen);
1da177e4
LT		 1789
1790int sock_no_shutdown(struct socket *sock, int how)
1791{
1792 return -EOPNOTSUPP;
1793}
2a91525c 1794EXPORT_SYMBOL(sock_no_shutdown);
1da177e4
LT		 1795
1796int sock_no_setsockopt(struct socket *sock, int level, int optname,
b7058842 1797 char __user *optval, unsigned int optlen)
1da177e4
LT		 1798{
1799 return -EOPNOTSUPP;
1800}
2a91525c 1801EXPORT_SYMBOL(sock_no_setsockopt);
1da177e4
LT		 1802
1803int sock_no_getsockopt(struct socket *sock, int level, int optname,
1804 char __user *optval, int __user *optlen)
1805{
1806 return -EOPNOTSUPP;
1807}
2a91525c 1808EXPORT_SYMBOL(sock_no_getsockopt);
1da177e4
LT		 1809
1810int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
1811 size_t len)
1812{
1813 return -EOPNOTSUPP;
1814}
2a91525c 1815EXPORT_SYMBOL(sock_no_sendmsg);
1da177e4
LT		 1816
1817int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
1818 size_t len, int flags)
1819{
1820 return -EOPNOTSUPP;
1821}
2a91525c 1822EXPORT_SYMBOL(sock_no_recvmsg);
1da177e4
LT		 1823
1824int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
1825{
1826 /* Mirror missing mmap method error code */
1827 return -ENODEV;
1828}
2a91525c 1829EXPORT_SYMBOL(sock_no_mmap);
1da177e4
LT		 1830
1831ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
1832{
1833 ssize_t res;
1834 struct msghdr msg = {.msg_flags = flags};
1835 struct kvec iov;
1836 char *kaddr = kmap(page);
1837 iov.iov_base = kaddr + offset;
1838 iov.iov_len = size;
1839 res = kernel_sendmsg(sock, &msg, &iov, 1, size);
1840 kunmap(page);
1841 return res;
1842}
2a91525c 1843EXPORT_SYMBOL(sock_no_sendpage);
1da177e4
LT		 1844
1845/*
1846 * Default Socket Callbacks
1847 */
1848
1849static void sock_def_wakeup(struct sock *sk)
1850{
43815482
ED		 1851 struct socket_wq *wq;
1852
1853 rcu_read_lock();
1854 wq = rcu_dereference(sk->sk_wq);
1855 if (wq_has_sleeper(wq))
1856 wake_up_interruptible_all(&wq->wait);
1857 rcu_read_unlock();
1da177e4
LT		 1858}
1859
1860static void sock_def_error_report(struct sock *sk)
1861{
43815482
ED		 1862 struct socket_wq *wq;
1863
1864 rcu_read_lock();
1865 wq = rcu_dereference(sk->sk_wq);
1866 if (wq_has_sleeper(wq))
1867 wake_up_interruptible_poll(&wq->wait, POLLERR);
8d8ad9d7 1868 sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR);
43815482 1869 rcu_read_unlock();
1da177e4
LT		 1870}
1871
1872static void sock_def_readable(struct sock *sk, int len)
1873{
43815482
ED		 1874 struct socket_wq *wq;
1875
1876 rcu_read_lock();
1877 wq = rcu_dereference(sk->sk_wq);
1878 if (wq_has_sleeper(wq))
1879 wake_up_interruptible_sync_poll(&wq->wait, POLLIN |
37e5540b 1880 POLLRDNORM | POLLRDBAND);
8d8ad9d7 1881 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
43815482 1882 rcu_read_unlock();
1da177e4
LT		 1883}
1884
1885static void sock_def_write_space(struct sock *sk)
1886{
43815482
ED		 1887 struct socket_wq *wq;
1888
1889 rcu_read_lock();
1da177e4
LT		 1890
1891 /* Do not wake up a writer until he can make "significant"
1892 * progress. --DaveM
1893 */
e71a4783 1894 if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) {
43815482
ED		 1895 wq = rcu_dereference(sk->sk_wq);
1896 if (wq_has_sleeper(wq))
1897 wake_up_interruptible_sync_poll(&wq->wait, POLLOUT |
37e5540b 1898 POLLWRNORM | POLLWRBAND);
1da177e4
LT		 1899
1900 /* Should agree with poll, otherwise some programs break */
1901 if (sock_writeable(sk))
8d8ad9d7 1902 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
1da177e4
LT		 1903 }
1904
43815482 1905 rcu_read_unlock();
1da177e4
LT		 1906}
1907
1908static void sock_def_destruct(struct sock *sk)
1909{
a51482bd 1910 kfree(sk->sk_protinfo);
1da177e4
LT		 1911}
1912
1913void sk_send_sigurg(struct sock *sk)
1914{
1915 if (sk->sk_socket && sk->sk_socket->file)
1916 if (send_sigurg(&sk->sk_socket->file->f_owner))
8d8ad9d7 1917 sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI);
1da177e4 1918}
2a91525c 1919EXPORT_SYMBOL(sk_send_sigurg);
1da177e4
LT		 1920
1921void sk_reset_timer(struct sock *sk, struct timer_list* timer,
1922 unsigned long expires)
1923{
1924 if (!mod_timer(timer, expires))
1925 sock_hold(sk);
1926}
1da177e4
LT		 1927EXPORT_SYMBOL(sk_reset_timer);
1928
1929void sk_stop_timer(struct sock *sk, struct timer_list* timer)
1930{
1931 if (timer_pending(timer) && del_timer(timer))
1932 __sock_put(sk);
1933}
1da177e4
LT		 1934EXPORT_SYMBOL(sk_stop_timer);
1935
1936void sock_init_data(struct socket *sock, struct sock *sk)
1937{
1938 skb_queue_head_init(&sk->sk_receive_queue);
1939 skb_queue_head_init(&sk->sk_write_queue);
1940 skb_queue_head_init(&sk->sk_error_queue);
97fc2f08
CL		 1941#ifdef CONFIG_NET_DMA
1942 skb_queue_head_init(&sk->sk_async_wait_queue);
1943#endif
1da177e4
LT		 1944
1945 sk->sk_send_head = NULL;
1946
1947 init_timer(&sk->sk_timer);
4ec93edb 1948
1da177e4
LT		 1949 sk->sk_allocation = GFP_KERNEL;
1950 sk->sk_rcvbuf = sysctl_rmem_default;
1951 sk->sk_sndbuf = sysctl_wmem_default;
1952 sk->sk_state = TCP_CLOSE;
972692e0 1953 sk_set_socket(sk, sock);
1da177e4
LT		 1954
1955 sock_set_flag(sk, SOCK_ZAPPED);
1956
e71a4783 1957 if (sock) {
1da177e4 1958 sk->sk_type = sock->type;
43815482 1959 sk->sk_wq = sock->wq;
1da177e4
LT		 1960 sock->sk = sk;
1961 } else
43815482 1962 sk->sk_wq = NULL;
1da177e4 1963
b6c6712a 1964 spin_lock_init(&sk->sk_dst_lock);
1da177e4 1965 rwlock_init(&sk->sk_callback_lock);
443aef0e
PZ		 1966 lockdep_set_class_and_name(&sk->sk_callback_lock,
1967 af_callback_keys + sk->sk_family,
1968 af_family_clock_key_strings[sk->sk_family]);
1da177e4
LT		 1969
1970 sk->sk_state_change = sock_def_wakeup;
1971 sk->sk_data_ready = sock_def_readable;
1972 sk->sk_write_space = sock_def_write_space;
1973 sk->sk_error_report = sock_def_error_report;
1974 sk->sk_destruct = sock_def_destruct;
1975
1976 sk->sk_sndmsg_page = NULL;
1977 sk->sk_sndmsg_off = 0;
1978
109f6e39
EB		 1979 sk->sk_peer_pid = NULL;
1980 sk->sk_peer_cred = NULL;
1da177e4
LT		 1981 sk->sk_write_pending = 0;
1982 sk->sk_rcvlowat = 1;
1983 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
1984 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
1985
f37f0afb 1986 sk->sk_stamp = ktime_set(-1L, 0);
1da177e4 1987
4dc6dc71
ED		 1988 /*
1989 * Before updating sk_refcnt, we must commit prior changes to memory
1990 * (Documentation/RCU/rculist_nulls.txt for details)
1991 */
1992 smp_wmb();
1da177e4 1993 atomic_set(&sk->sk_refcnt, 1);
33c732c3 1994 atomic_set(&sk->sk_drops, 0);
1da177e4 1995}
2a91525c 1996EXPORT_SYMBOL(sock_init_data);
1da177e4 1997
b5606c2d 1998void lock_sock_nested(struct sock *sk, int subclass)
1da177e4
LT		 1999{
2000 might_sleep();
a5b5bb9a 2001 spin_lock_bh(&sk->sk_lock.slock);
d2e9117c 2002 if (sk->sk_lock.owned)
1da177e4 2003 __lock_sock(sk);
d2e9117c 2004 sk->sk_lock.owned = 1;
a5b5bb9a
IM		 2005 spin_unlock(&sk->sk_lock.slock);
2006 /*
2007 * The sk_lock has mutex_lock() semantics here:
2008 */
fcc70d5f 2009 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
a5b5bb9a 2010 local_bh_enable();
1da177e4 2011}
fcc70d5f 2012EXPORT_SYMBOL(lock_sock_nested);
1da177e4 2013
b5606c2d 2014void release_sock(struct sock *sk)
1da177e4 2015{
a5b5bb9a
IM		 2016 /*
2017 * The sk_lock has mutex_unlock() semantics:
2018 */
2019 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
2020
2021 spin_lock_bh(&sk->sk_lock.slock);
1da177e4
LT		 2022 if (sk->sk_backlog.tail)
2023 __release_sock(sk);
d2e9117c 2024 sk->sk_lock.owned = 0;
a5b5bb9a
IM		 2025 if (waitqueue_active(&sk->sk_lock.wq))
2026 wake_up(&sk->sk_lock.wq);
2027 spin_unlock_bh(&sk->sk_lock.slock);
1da177e4
LT		 2028}
2029EXPORT_SYMBOL(release_sock);
2030
8a74ad60
ED		 2031/**
2032 * lock_sock_fast - fast version of lock_sock
2033 * @sk: socket
2034 *
2035 * This version should be used for very small section, where process wont block
2036 * return false if fast path is taken
2037 * sk_lock.slock locked, owned = 0, BH disabled
2038 * return true if slow path is taken
2039 * sk_lock.slock unlocked, owned = 1, BH enabled
2040 */
2041bool lock_sock_fast(struct sock *sk)
2042{
2043 might_sleep();
2044 spin_lock_bh(&sk->sk_lock.slock);
2045
2046 if (!sk->sk_lock.owned)
2047 /*
2048 * Note : We must disable BH
2049 */
2050 return false;
2051
2052 __lock_sock(sk);
2053 sk->sk_lock.owned = 1;
2054 spin_unlock(&sk->sk_lock.slock);
2055 /*
2056 * The sk_lock has mutex_lock() semantics here:
2057 */
2058 mutex_acquire(&sk->sk_lock.dep_map, 0, 0, _RET_IP_);
2059 local_bh_enable();
2060 return true;
2061}
2062EXPORT_SYMBOL(lock_sock_fast);
2063
1da177e4 2064int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
4ec93edb 2065{
b7aa0bf7 2066 struct timeval tv;
1da177e4 2067 if (!sock_flag(sk, SOCK_TIMESTAMP))
20d49473 2068 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
b7aa0bf7
ED		 2069 tv = ktime_to_timeval(sk->sk_stamp);
2070 if (tv.tv_sec == -1)
1da177e4 2071 return -ENOENT;
b7aa0bf7
ED		 2072 if (tv.tv_sec == 0) {
2073 sk->sk_stamp = ktime_get_real();
2074 tv = ktime_to_timeval(sk->sk_stamp);
2075 }
2076 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0;
4ec93edb 2077}
1da177e4
LT		 2078EXPORT_SYMBOL(sock_get_timestamp);
2079
ae40eb1e
ED		 2080int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
2081{
2082 struct timespec ts;
2083 if (!sock_flag(sk, SOCK_TIMESTAMP))
20d49473 2084 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
ae40eb1e
ED		 2085 ts = ktime_to_timespec(sk->sk_stamp);
2086 if (ts.tv_sec == -1)
2087 return -ENOENT;
2088 if (ts.tv_sec == 0) {
2089 sk->sk_stamp = ktime_get_real();
2090 ts = ktime_to_timespec(sk->sk_stamp);
2091 }
2092 return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0;
2093}
2094EXPORT_SYMBOL(sock_get_timestampns);
2095
20d49473 2096void sock_enable_timestamp(struct sock *sk, int flag)
4ec93edb 2097{
20d49473
PO		 2098 if (!sock_flag(sk, flag)) {
2099 sock_set_flag(sk, flag);
2100 /*
2101 * we just set one of the two flags which require net
2102 * time stamping, but time stamping might have been on
2103 * already because of the other one
2104 */
2105 if (!sock_flag(sk,
2106 flag == SOCK_TIMESTAMP ?
2107 SOCK_TIMESTAMPING_RX_SOFTWARE :
2108 SOCK_TIMESTAMP))
2109 net_enable_timestamp();
1da177e4
LT		 2110 }
2111}
1da177e4
LT		 2112
2113/*
2114 * Get a socket option on an socket.
2115 *
2116 * FIX: POSIX 1003.1g is very ambiguous here. It states that
2117 * asynchronous errors should be reported by getsockopt. We assume
2118 * this means if you specify SO_ERROR (otherwise whats the point of it).
2119 */
2120int sock_common_getsockopt(struct socket *sock, int level, int optname,
2121 char __user *optval, int __user *optlen)
2122{
2123 struct sock *sk = sock->sk;
2124
2125 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2126}
1da177e4
LT		 2127EXPORT_SYMBOL(sock_common_getsockopt);
2128
3fdadf7d 2129#ifdef CONFIG_COMPAT
543d9cfe
ACM		 2130int compat_sock_common_getsockopt(struct socket *sock, int level, int optname,
2131 char __user *optval, int __user *optlen)
3fdadf7d
DM		 2132{
2133 struct sock *sk = sock->sk;
2134
1e51f951 2135 if (sk->sk_prot->compat_getsockopt != NULL)
543d9cfe
ACM		 2136 return sk->sk_prot->compat_getsockopt(sk, level, optname,
2137 optval, optlen);
3fdadf7d
DM		 2138 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2139}
2140EXPORT_SYMBOL(compat_sock_common_getsockopt);
2141#endif
2142
1da177e4
LT		 2143int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock,
2144 struct msghdr *msg, size_t size, int flags)
2145{
2146 struct sock *sk = sock->sk;
2147 int addr_len = 0;
2148 int err;
2149
2150 err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT,
2151 flags & ~MSG_DONTWAIT, &addr_len);
2152 if (err >= 0)
2153 msg->msg_namelen = addr_len;
2154 return err;
2155}
1da177e4
LT		 2156EXPORT_SYMBOL(sock_common_recvmsg);
2157
2158/*
2159 * Set socket options on an inet socket.
2160 */
2161int sock_common_setsockopt(struct socket *sock, int level, int optname,
b7058842 2162 char __user *optval, unsigned int optlen)
1da177e4
LT		 2163{
2164 struct sock *sk = sock->sk;
2165
2166 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2167}
1da177e4
LT		 2168EXPORT_SYMBOL(sock_common_setsockopt);
2169
3fdadf7d 2170#ifdef CONFIG_COMPAT
543d9cfe 2171int compat_sock_common_setsockopt(struct socket *sock, int level, int optname,
b7058842 2172 char __user *optval, unsigned int optlen)
3fdadf7d
DM		 2173{
2174 struct sock *sk = sock->sk;
2175
543d9cfe
ACM		 2176 if (sk->sk_prot->compat_setsockopt != NULL)
2177 return sk->sk_prot->compat_setsockopt(sk, level, optname,
2178 optval, optlen);
3fdadf7d
DM		 2179 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2180}
2181EXPORT_SYMBOL(compat_sock_common_setsockopt);
2182#endif
2183
1da177e4
LT		 2184void sk_common_release(struct sock *sk)
2185{
2186 if (sk->sk_prot->destroy)
2187 sk->sk_prot->destroy(sk);
2188
2189 /*
2190 * Observation: when sock_common_release is called, processes have
2191 * no access to socket. But net still has.
2192 * Step one, detach it from networking:
2193 *
2194 * A. Remove from hash tables.
2195 */
2196
2197 sk->sk_prot->unhash(sk);
2198
2199 /*
2200 * In this point socket cannot receive new packets, but it is possible
2201 * that some packets are in flight because some CPU runs receiver and
2202 * did hash table lookup before we unhashed socket. They will achieve
2203 * receive queue and will be purged by socket destructor.
2204 *
2205 * Also we still have packets pending on receive queue and probably,
2206 * our own packets waiting in device queues. sock_destroy will drain
2207 * receive queue, but transmitted packets will delay socket destruction
2208 * until the last reference will be released.
2209 */
2210
2211 sock_orphan(sk);
2212
2213 xfrm_sk_free_policy(sk);
2214
e6848976 2215 sk_refcnt_debug_release(sk);
1da177e4
LT		 2216 sock_put(sk);
2217}
1da177e4
LT		 2218EXPORT_SYMBOL(sk_common_release);
2219
2220static DEFINE_RWLOCK(proto_list_lock);
2221static LIST_HEAD(proto_list);
2222
13ff3d6f
PE		 2223#ifdef CONFIG_PROC_FS
2224#define PROTO_INUSE_NR 64 /* should be enough for the first time */
1338d466
PE		 2225struct prot_inuse {
2226 int val[PROTO_INUSE_NR];
2227};
13ff3d6f
PE		 2228
2229static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR);
70ee1159
PE		 2230
2231#ifdef CONFIG_NET_NS
2232void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
2233{
2234 int cpu = smp_processor_id();
2235 per_cpu_ptr(net->core.inuse, cpu)->val[prot->inuse_idx] += val;
2236}
2237EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2238
2239int sock_prot_inuse_get(struct net *net, struct proto *prot)
2240{
2241 int cpu, idx = prot->inuse_idx;
2242 int res = 0;
2243
2244 for_each_possible_cpu(cpu)
2245 res += per_cpu_ptr(net->core.inuse, cpu)->val[idx];
2246
2247 return res >= 0 ? res : 0;
2248}
2249EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
2250
2c8c1e72 2251static int __net_init sock_inuse_init_net(struct net *net)
70ee1159
PE		 2252{
2253 net->core.inuse = alloc_percpu(struct prot_inuse);
2254 return net->core.inuse ? 0 : -ENOMEM;
2255}
2256
2c8c1e72 2257static void __net_exit sock_inuse_exit_net(struct net *net)
70ee1159
PE		 2258{
2259 free_percpu(net->core.inuse);
2260}
2261
2262static struct pernet_operations net_inuse_ops = {
2263 .init = sock_inuse_init_net,
2264 .exit = sock_inuse_exit_net,
2265};
2266
2267static __init int net_inuse_init(void)
2268{
2269 if (register_pernet_subsys(&net_inuse_ops))
2270 panic("Cannot initialize net inuse counters");
2271
2272 return 0;
2273}
2274
2275core_initcall(net_inuse_init);
2276#else
1338d466
PE		 2277static DEFINE_PER_CPU(struct prot_inuse, prot_inuse);
2278
c29a0bc4 2279void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
1338d466
PE		 2280{
2281 __get_cpu_var(prot_inuse).val[prot->inuse_idx] += val;
2282}
2283EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2284
c29a0bc4 2285int sock_prot_inuse_get(struct net *net, struct proto *prot)
1338d466
PE		 2286{
2287 int cpu, idx = prot->inuse_idx;
2288 int res = 0;
2289
2290 for_each_possible_cpu(cpu)
2291 res += per_cpu(prot_inuse, cpu).val[idx];
2292
2293 return res >= 0 ? res : 0;
2294}
2295EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
70ee1159 2296#endif
13ff3d6f
PE		 2297
2298static void assign_proto_idx(struct proto *prot)
2299{
2300 prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR);
2301
2302 if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) {
2303 printk(KERN_ERR "PROTO_INUSE_NR exhausted\n");
2304 return;
2305 }
2306
2307 set_bit(prot->inuse_idx, proto_inuse_idx);
2308}
2309
2310static void release_proto_idx(struct proto *prot)
2311{
2312 if (prot->inuse_idx != PROTO_INUSE_NR - 1)
2313 clear_bit(prot->inuse_idx, proto_inuse_idx);
2314}
2315#else
2316static inline void assign_proto_idx(struct proto *prot)
2317{
2318}
2319
2320static inline void release_proto_idx(struct proto *prot)
2321{
2322}
2323#endif
2324
b733c007
PE		 2325int proto_register(struct proto *prot, int alloc_slab)
2326{
1da177e4
LT		 2327 if (alloc_slab) {
2328 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0,
271b72c7
ED		 2329 SLAB_HWCACHE_ALIGN | prot->slab_flags,
2330 NULL);
1da177e4
LT		 2331
2332 if (prot->slab == NULL) {
2333 printk(KERN_CRIT "%s: Can't create sock SLAB cache!\n",
2334 prot->name);
60e7663d 2335 goto out;
1da177e4 2336 }
2e6599cb
ACM		 2337
2338 if (prot->rsk_prot != NULL) {
faf23422 2339 prot->rsk_prot->slab_name = kasprintf(GFP_KERNEL, "request_sock_%s", prot->name);
7e56b5d6 2340 if (prot->rsk_prot->slab_name == NULL)
2e6599cb
ACM		 2341 goto out_free_sock_slab;
2342
7e56b5d6 2343 prot->rsk_prot->slab = kmem_cache_create(prot->rsk_prot->slab_name,
2e6599cb 2344 prot->rsk_prot->obj_size, 0,
20c2df83 2345 SLAB_HWCACHE_ALIGN, NULL);
2e6599cb
ACM		 2346
2347 if (prot->rsk_prot->slab == NULL) {
2348 printk(KERN_CRIT "%s: Can't create request sock SLAB cache!\n",
2349 prot->name);
2350 goto out_free_request_sock_slab_name;
2351 }
2352 }
8feaf0c0 2353
6d6ee43e 2354 if (prot->twsk_prot != NULL) {
faf23422 2355 prot->twsk_prot->twsk_slab_name = kasprintf(GFP_KERNEL, "tw_sock_%s", prot->name);
8feaf0c0 2356
7e56b5d6 2357 if (prot->twsk_prot->twsk_slab_name == NULL)
8feaf0c0
ACM		 2358 goto out_free_request_sock_slab;
2359
6d6ee43e 2360 prot->twsk_prot->twsk_slab =
7e56b5d6 2361 kmem_cache_create(prot->twsk_prot->twsk_slab_name,
6d6ee43e 2362 prot->twsk_prot->twsk_obj_size,
3ab5aee7
ED		 2363 0,
2364 SLAB_HWCACHE_ALIGN |
2365 prot->slab_flags,
20c2df83 2366 NULL);
6d6ee43e 2367 if (prot->twsk_prot->twsk_slab == NULL)
8feaf0c0
ACM		 2368 goto out_free_timewait_sock_slab_name;
2369 }
1da177e4
LT		 2370 }
2371
2a278051 2372 write_lock(&proto_list_lock);
1da177e4 2373 list_add(&prot->node, &proto_list);
13ff3d6f 2374 assign_proto_idx(prot);
1da177e4 2375 write_unlock(&proto_list_lock);
b733c007
PE		 2376 return 0;
2377
8feaf0c0 2378out_free_timewait_sock_slab_name:
7e56b5d6 2379 kfree(prot->twsk_prot->twsk_slab_name);
8feaf0c0
ACM		 2380out_free_request_sock_slab:
2381 if (prot->rsk_prot && prot->rsk_prot->slab) {
2382 kmem_cache_destroy(prot->rsk_prot->slab);
2383 prot->rsk_prot->slab = NULL;
2384 }
2e6599cb 2385out_free_request_sock_slab_name:
72150e9b
DC		 2386 if (prot->rsk_prot)
2387 kfree(prot->rsk_prot->slab_name);
2e6599cb
ACM		 2388out_free_sock_slab:
2389 kmem_cache_destroy(prot->slab);
2390 prot->slab = NULL;
b733c007
PE		 2391out:
2392 return -ENOBUFS;
1da177e4 2393}
1da177e4
LT		 2394EXPORT_SYMBOL(proto_register);
2395
2396void proto_unregister(struct proto *prot)
2397{
2398 write_lock(&proto_list_lock);
13ff3d6f 2399 release_proto_idx(prot);
0a3f4358
PM		 2400 list_del(&prot->node);
2401 write_unlock(&proto_list_lock);
1da177e4
LT		 2402
2403 if (prot->slab != NULL) {
2404 kmem_cache_destroy(prot->slab);
2405 prot->slab = NULL;
2406 }
2407
2e6599cb 2408 if (prot->rsk_prot != NULL && prot->rsk_prot->slab != NULL) {
2e6599cb 2409 kmem_cache_destroy(prot->rsk_prot->slab);
7e56b5d6 2410 kfree(prot->rsk_prot->slab_name);
2e6599cb
ACM		 2411 prot->rsk_prot->slab = NULL;
2412 }
2413
6d6ee43e 2414 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) {
6d6ee43e 2415 kmem_cache_destroy(prot->twsk_prot->twsk_slab);
7e56b5d6 2416 kfree(prot->twsk_prot->twsk_slab_name);
6d6ee43e 2417 prot->twsk_prot->twsk_slab = NULL;
8feaf0c0 2418 }
1da177e4 2419}
1da177e4
LT		 2420EXPORT_SYMBOL(proto_unregister);
2421
2422#ifdef CONFIG_PROC_FS
1da177e4 2423static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
9a429c49 2424 __acquires(proto_list_lock)
1da177e4
LT		 2425{
2426 read_lock(&proto_list_lock);
60f0438a 2427 return seq_list_start_head(&proto_list, *pos);
1da177e4
LT		 2428}
2429
2430static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2431{
60f0438a 2432 return seq_list_next(v, &proto_list, pos);
1da177e4
LT		 2433}
2434
2435static void proto_seq_stop(struct seq_file *seq, void *v)
9a429c49 2436 __releases(proto_list_lock)
1da177e4
LT		 2437{
2438 read_unlock(&proto_list_lock);
2439}
2440
2441static char proto_method_implemented(const void *method)
2442{
2443 return method == NULL ? 'n' : 'y';
2444}
2445
2446static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
2447{
2448 seq_printf(seq, "%-9s %4u %6d %6d %-3s %6u %-3s %-10s "
2449 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
2450 proto->name,
2451 proto->obj_size,
14e943db 2452 sock_prot_inuse_get(seq_file_net(seq), proto),
1da177e4
LT		 2453 proto->memory_allocated != NULL ? atomic_read(proto->memory_allocated) : -1,
2454 proto->memory_pressure != NULL ? *proto->memory_pressure ? "yes" : "no" : "NI",
2455 proto->max_header,
2456 proto->slab == NULL ? "no" : "yes",
2457 module_name(proto->owner),
2458 proto_method_implemented(proto->close),
2459 proto_method_implemented(proto->connect),
2460 proto_method_implemented(proto->disconnect),
2461 proto_method_implemented(proto->accept),
2462 proto_method_implemented(proto->ioctl),
2463 proto_method_implemented(proto->init),
2464 proto_method_implemented(proto->destroy),
2465 proto_method_implemented(proto->shutdown),
2466 proto_method_implemented(proto->setsockopt),
2467 proto_method_implemented(proto->getsockopt),
2468 proto_method_implemented(proto->sendmsg),
2469 proto_method_implemented(proto->recvmsg),
2470 proto_method_implemented(proto->sendpage),
2471 proto_method_implemented(proto->bind),
2472 proto_method_implemented(proto->backlog_rcv),
2473 proto_method_implemented(proto->hash),
2474 proto_method_implemented(proto->unhash),
2475 proto_method_implemented(proto->get_port),
2476 proto_method_implemented(proto->enter_memory_pressure));
2477}
2478
2479static int proto_seq_show(struct seq_file *seq, void *v)
2480{
60f0438a 2481 if (v == &proto_list)
1da177e4
LT		 2482 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
2483 "protocol",
2484 "size",
2485 "sockets",
2486 "memory",
2487 "press",
2488 "maxhdr",
2489 "slab",
2490 "module",
2491 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
2492 else
60f0438a 2493 proto_seq_printf(seq, list_entry(v, struct proto, node));
1da177e4
LT		 2494 return 0;
2495}
2496
f690808e 2497static const struct seq_operations proto_seq_ops = {
1da177e4
LT		 2498 .start = proto_seq_start,
2499 .next = proto_seq_next,
2500 .stop = proto_seq_stop,
2501 .show = proto_seq_show,
2502};
2503
2504static int proto_seq_open(struct inode *inode, struct file *file)
2505{
14e943db
ED		 2506 return seq_open_net(inode, file, &proto_seq_ops,
2507 sizeof(struct seq_net_private));
1da177e4
LT		 2508}
2509
9a32144e 2510static const struct file_operations proto_seq_fops = {
1da177e4
LT		 2511 .owner = THIS_MODULE,
2512 .open = proto_seq_open,
2513 .read = seq_read,
2514 .llseek = seq_lseek,
14e943db
ED		 2515 .release = seq_release_net,
2516};
2517
2518static __net_init int proto_init_net(struct net *net)
2519{
2520 if (!proc_net_fops_create(net, "protocols", S_IRUGO, &proto_seq_fops))
2521 return -ENOMEM;
2522
2523 return 0;
2524}
2525
2526static __net_exit void proto_exit_net(struct net *net)
2527{
2528 proc_net_remove(net, "protocols");
2529}
2530
2531
2532static __net_initdata struct pernet_operations proto_net_ops = {
2533 .init = proto_init_net,
2534 .exit = proto_exit_net,
1da177e4
LT		 2535};
2536
2537static int __init proto_init(void)
2538{
14e943db 2539 return register_pernet_subsys(&proto_net_ops);
1da177e4
LT		 2540}
2541
2542subsys_initcall(proto_init);
2543
2544#endif /* PROC_FS */
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