]> bbs.cooldavid.org Git - net-next-2.6.git/blame - net/core/sock.c
git://bbs.cooldavid.org / net-next-2.6.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
cls_cgroup: Store classid in struct sock
[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>
1da177e4
LT		 113
114#include <asm/uaccess.h>
115#include <asm/system.h>
116
117#include <linux/netdevice.h>
118#include <net/protocol.h>
119#include <linux/skbuff.h>
457c4cbc 120#include <net/net_namespace.h>
2e6599cb 121#include <net/request_sock.h>
1da177e4 122#include <net/sock.h>
20d49473 123#include <linux/net_tstamp.h>
1da177e4
LT		 124#include <net/xfrm.h>
125#include <linux/ipsec.h>
f8451725 126#include <net/cls_cgroup.h>
1da177e4
LT		 127
128#include <linux/filter.h>
129
130#ifdef CONFIG_INET
131#include <net/tcp.h>
132#endif
133
da21f24d
IM		 134/*
135 * Each address family might have different locking rules, so we have
136 * one slock key per address family:
137 */
a5b5bb9a
IM		 138static struct lock_class_key af_family_keys[AF_MAX];
139static struct lock_class_key af_family_slock_keys[AF_MAX];
140
a5b5bb9a
IM		 141/*
142 * Make lock validator output more readable. (we pre-construct these
143 * strings build-time, so that runtime initialization of socket
144 * locks is fast):
145 */
36cbd3dc 146static const char *const af_family_key_strings[AF_MAX+1] = {
a5b5bb9a
IM		 147 "sk_lock-AF_UNSPEC", "sk_lock-AF_UNIX" , "sk_lock-AF_INET" ,
148 "sk_lock-AF_AX25" , "sk_lock-AF_IPX" , "sk_lock-AF_APPLETALK",
149 "sk_lock-AF_NETROM", "sk_lock-AF_BRIDGE" , "sk_lock-AF_ATMPVC" ,
150 "sk_lock-AF_X25" , "sk_lock-AF_INET6" , "sk_lock-AF_ROSE" ,
151 "sk_lock-AF_DECnet", "sk_lock-AF_NETBEUI" , "sk_lock-AF_SECURITY" ,
152 "sk_lock-AF_KEY" , "sk_lock-AF_NETLINK" , "sk_lock-AF_PACKET" ,
153 "sk_lock-AF_ASH" , "sk_lock-AF_ECONET" , "sk_lock-AF_ATMSVC" ,
cbd151bf 154 "sk_lock-AF_RDS" , "sk_lock-AF_SNA" , "sk_lock-AF_IRDA" ,
a5b5bb9a 155 "sk_lock-AF_PPPOX" , "sk_lock-AF_WANPIPE" , "sk_lock-AF_LLC" ,
cd05acfe 156 "sk_lock-27" , "sk_lock-28" , "sk_lock-AF_CAN" ,
17926a79 157 "sk_lock-AF_TIPC" , "sk_lock-AF_BLUETOOTH", "sk_lock-IUCV" ,
bce7b154 158 "sk_lock-AF_RXRPC" , "sk_lock-AF_ISDN" , "sk_lock-AF_PHONET" ,
fcb94e42 159 "sk_lock-AF_IEEE802154",
bce7b154 160 "sk_lock-AF_MAX"
a5b5bb9a 161};
36cbd3dc 162static const char *const af_family_slock_key_strings[AF_MAX+1] = {
a5b5bb9a
IM		 163 "slock-AF_UNSPEC", "slock-AF_UNIX" , "slock-AF_INET" ,
164 "slock-AF_AX25" , "slock-AF_IPX" , "slock-AF_APPLETALK",
165 "slock-AF_NETROM", "slock-AF_BRIDGE" , "slock-AF_ATMPVC" ,
166 "slock-AF_X25" , "slock-AF_INET6" , "slock-AF_ROSE" ,
167 "slock-AF_DECnet", "slock-AF_NETBEUI" , "slock-AF_SECURITY" ,
168 "slock-AF_KEY" , "slock-AF_NETLINK" , "slock-AF_PACKET" ,
169 "slock-AF_ASH" , "slock-AF_ECONET" , "slock-AF_ATMSVC" ,
cbd151bf 170 "slock-AF_RDS" , "slock-AF_SNA" , "slock-AF_IRDA" ,
a5b5bb9a 171 "slock-AF_PPPOX" , "slock-AF_WANPIPE" , "slock-AF_LLC" ,
cd05acfe 172 "slock-27" , "slock-28" , "slock-AF_CAN" ,
17926a79 173 "slock-AF_TIPC" , "slock-AF_BLUETOOTH", "slock-AF_IUCV" ,
bce7b154 174 "slock-AF_RXRPC" , "slock-AF_ISDN" , "slock-AF_PHONET" ,
fcb94e42 175 "slock-AF_IEEE802154",
bce7b154 176 "slock-AF_MAX"
a5b5bb9a 177};
36cbd3dc 178static const char *const af_family_clock_key_strings[AF_MAX+1] = {
443aef0e
PZ		 179 "clock-AF_UNSPEC", "clock-AF_UNIX" , "clock-AF_INET" ,
180 "clock-AF_AX25" , "clock-AF_IPX" , "clock-AF_APPLETALK",
181 "clock-AF_NETROM", "clock-AF_BRIDGE" , "clock-AF_ATMPVC" ,
182 "clock-AF_X25" , "clock-AF_INET6" , "clock-AF_ROSE" ,
183 "clock-AF_DECnet", "clock-AF_NETBEUI" , "clock-AF_SECURITY" ,
184 "clock-AF_KEY" , "clock-AF_NETLINK" , "clock-AF_PACKET" ,
185 "clock-AF_ASH" , "clock-AF_ECONET" , "clock-AF_ATMSVC" ,
cbd151bf 186 "clock-AF_RDS" , "clock-AF_SNA" , "clock-AF_IRDA" ,
443aef0e 187 "clock-AF_PPPOX" , "clock-AF_WANPIPE" , "clock-AF_LLC" ,
b4942af6 188 "clock-27" , "clock-28" , "clock-AF_CAN" ,
e51f802b 189 "clock-AF_TIPC" , "clock-AF_BLUETOOTH", "clock-AF_IUCV" ,
bce7b154 190 "clock-AF_RXRPC" , "clock-AF_ISDN" , "clock-AF_PHONET" ,
fcb94e42 191 "clock-AF_IEEE802154",
bce7b154 192 "clock-AF_MAX"
443aef0e 193};
da21f24d
IM		 194
195/*
196 * sk_callback_lock locking rules are per-address-family,
197 * so split the lock classes by using a per-AF key:
198 */
199static struct lock_class_key af_callback_keys[AF_MAX];
200
1da177e4
LT		 201/* Take into consideration the size of the struct sk_buff overhead in the
202 * determination of these values, since that is non-constant across
203 * platforms. This makes socket queueing behavior and performance
204 * not depend upon such differences.
205 */
206#define _SK_MEM_PACKETS 256
207#define _SK_MEM_OVERHEAD (sizeof(struct sk_buff) + 256)
208#define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
209#define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
210
211/* Run time adjustable parameters. */
ab32ea5d
BH		 212__u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX;
213__u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX;
214__u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX;
215__u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX;
1da177e4
LT		 216
217/* Maximal space eaten by iovec or ancilliary data plus some space */
ab32ea5d 218int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512);
2a91525c 219EXPORT_SYMBOL(sysctl_optmem_max);
1da177e4 220
f8451725
HX		 221#if defined(CONFIG_CGROUPS) && !defined(CONFIG_NET_CLS_CGROUP)
222int net_cls_subsys_id = -1;
223EXPORT_SYMBOL_GPL(net_cls_subsys_id);
224#endif
225
1da177e4
LT		 226static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen)
227{
228 struct timeval tv;
229
230 if (optlen < sizeof(tv))
231 return -EINVAL;
232 if (copy_from_user(&tv, optval, sizeof(tv)))
233 return -EFAULT;
ba78073e
VA		 234 if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC)
235 return -EDOM;
1da177e4 236
ba78073e 237 if (tv.tv_sec < 0) {
6f11df83
AM		 238 static int warned __read_mostly;
239
ba78073e 240 *timeo_p = 0;
50aab54f 241 if (warned < 10 && net_ratelimit()) {
ba78073e
VA		 242 warned++;
243 printk(KERN_INFO "sock_set_timeout: `%s' (pid %d) "
244 "tries to set negative timeout\n",
ba25f9dc 245 current->comm, task_pid_nr(current));
50aab54f 246 }
ba78073e
VA		 247 return 0;
248 }
1da177e4
LT		 249 *timeo_p = MAX_SCHEDULE_TIMEOUT;
250 if (tv.tv_sec == 0 && tv.tv_usec == 0)
251 return 0;
252 if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1))
253 *timeo_p = tv.tv_sec*HZ + (tv.tv_usec+(1000000/HZ-1))/(1000000/HZ);
254 return 0;
255}
256
257static void sock_warn_obsolete_bsdism(const char *name)
258{
259 static int warned;
260 static char warncomm[TASK_COMM_LEN];
4ec93edb
YH		 261 if (strcmp(warncomm, current->comm) && warned < 5) {
262 strcpy(warncomm, current->comm);
1da177e4
LT		 263 printk(KERN_WARNING "process `%s' is using obsolete "
264 "%s SO_BSDCOMPAT\n", warncomm, name);
265 warned++;
266 }
267}
268
20d49473 269static void sock_disable_timestamp(struct sock *sk, int flag)
4ec93edb 270{
20d49473
PO		 271 if (sock_flag(sk, flag)) {
272 sock_reset_flag(sk, flag);
273 if (!sock_flag(sk, SOCK_TIMESTAMP) &&
274 !sock_flag(sk, SOCK_TIMESTAMPING_RX_SOFTWARE)) {
275 net_disable_timestamp();
276 }
1da177e4
LT		 277 }
278}
279
280
f0088a50
DV		 281int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
282{
766e9037 283 int err;
f0088a50 284 int skb_len;
3b885787
NH		 285 unsigned long flags;
286 struct sk_buff_head *list = &sk->sk_receive_queue;
f0088a50 287
9ee6b7f1 288 /* Cast sk->rcvbuf to unsigned... It's pointless, but reduces
f0088a50
DV		 289 number of warnings when compiling with -W --ANK
290 */
291 if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >=
292 (unsigned)sk->sk_rcvbuf) {
766e9037
ED		 293 atomic_inc(&sk->sk_drops);
294 return -ENOMEM;
f0088a50
DV		 295 }
296
fda9ef5d 297 err = sk_filter(sk, skb);
f0088a50 298 if (err)
766e9037 299 return err;
f0088a50 300
3ab224be 301 if (!sk_rmem_schedule(sk, skb->truesize)) {
766e9037
ED		 302 atomic_inc(&sk->sk_drops);
303 return -ENOBUFS;
3ab224be
HA		 304 }
305
f0088a50
DV		 306 skb->dev = NULL;
307 skb_set_owner_r(skb, sk);
49ad9599 308
f0088a50
DV		 309 /* Cache the SKB length before we tack it onto the receive
310 * queue. Once it is added it no longer belongs to us and
311 * may be freed by other threads of control pulling packets
312 * from the queue.
313 */
314 skb_len = skb->len;
315
7fee226a
ED		 316 /* we escape from rcu protected region, make sure we dont leak
317 * a norefcounted dst
318 */
319 skb_dst_force(skb);
320
3b885787
NH		 321 spin_lock_irqsave(&list->lock, flags);
322 skb->dropcount = atomic_read(&sk->sk_drops);
323 __skb_queue_tail(list, skb);
324 spin_unlock_irqrestore(&list->lock, flags);
f0088a50
DV		 325
326 if (!sock_flag(sk, SOCK_DEAD))
327 sk->sk_data_ready(sk, skb_len);
766e9037 328 return 0;
f0088a50
DV		 329}
330EXPORT_SYMBOL(sock_queue_rcv_skb);
331
58a5a7b9 332int sk_receive_skb(struct sock *sk, struct sk_buff *skb, const int nested)
f0088a50
DV		 333{
334 int rc = NET_RX_SUCCESS;
335
fda9ef5d 336 if (sk_filter(sk, skb))
f0088a50
DV		 337 goto discard_and_relse;
338
339 skb->dev = NULL;
340
c377411f
ED		 341 if (sk_rcvqueues_full(sk, skb)) {
342 atomic_inc(&sk->sk_drops);
343 goto discard_and_relse;
344 }
58a5a7b9
ACM		 345 if (nested)
346 bh_lock_sock_nested(sk);
347 else
348 bh_lock_sock(sk);
a5b5bb9a
IM		 349 if (!sock_owned_by_user(sk)) {
350 /*
351 * trylock + unlock semantics:
352 */
353 mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_);
354
c57943a1 355 rc = sk_backlog_rcv(sk, skb);
a5b5bb9a
IM		 356
357 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
a3a858ff 358 } else if (sk_add_backlog(sk, skb)) {
8eae939f
ZY		 359 bh_unlock_sock(sk);
360 atomic_inc(&sk->sk_drops);
361 goto discard_and_relse;
362 }
363
f0088a50
DV		 364 bh_unlock_sock(sk);
365out:
366 sock_put(sk);
367 return rc;
368discard_and_relse:
369 kfree_skb(skb);
370 goto out;
371}
372EXPORT_SYMBOL(sk_receive_skb);
373
ea94ff3b
KK		 374void sk_reset_txq(struct sock *sk)
375{
376 sk_tx_queue_clear(sk);
377}
378EXPORT_SYMBOL(sk_reset_txq);
379
f0088a50
DV		 380struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie)
381{
b6c6712a 382 struct dst_entry *dst = __sk_dst_get(sk);
f0088a50
DV		 383
384 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
e022f0b4 385 sk_tx_queue_clear(sk);
b6c6712a 386 rcu_assign_pointer(sk->sk_dst_cache, NULL);
f0088a50
DV		 387 dst_release(dst);
388 return NULL;
389 }
390
391 return dst;
392}
393EXPORT_SYMBOL(__sk_dst_check);
394
395struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie)
396{
397 struct dst_entry *dst = sk_dst_get(sk);
398
399 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
400 sk_dst_reset(sk);
401 dst_release(dst);
402 return NULL;
403 }
404
405 return dst;
406}
407EXPORT_SYMBOL(sk_dst_check);
408
4878809f
DM		 409static int sock_bindtodevice(struct sock *sk, char __user *optval, int optlen)
410{
411 int ret = -ENOPROTOOPT;
412#ifdef CONFIG_NETDEVICES
3b1e0a65 413 struct net *net = sock_net(sk);
4878809f
DM		 414 char devname[IFNAMSIZ];
415 int index;
416
417 /* Sorry... */
418 ret = -EPERM;
419 if (!capable(CAP_NET_RAW))
420 goto out;
421
422 ret = -EINVAL;
423 if (optlen < 0)
424 goto out;
425
426 /* Bind this socket to a particular device like "eth0",
427 * as specified in the passed interface name. If the
428 * name is "" or the option length is zero the socket
429 * is not bound.
430 */
431 if (optlen > IFNAMSIZ - 1)
432 optlen = IFNAMSIZ - 1;
433 memset(devname, 0, sizeof(devname));
434
435 ret = -EFAULT;
436 if (copy_from_user(devname, optval, optlen))
437 goto out;
438
000ba2e4
DM		 439 index = 0;
440 if (devname[0] != '\0') {
bf8e56bf 441 struct net_device *dev;
4878809f 442
bf8e56bf
ED		 443 rcu_read_lock();
444 dev = dev_get_by_name_rcu(net, devname);
445 if (dev)
446 index = dev->ifindex;
447 rcu_read_unlock();
4878809f
DM		 448 ret = -ENODEV;
449 if (!dev)
450 goto out;
4878809f
DM		 451 }
452
453 lock_sock(sk);
454 sk->sk_bound_dev_if = index;
455 sk_dst_reset(sk);
456 release_sock(sk);
457
458 ret = 0;
459
460out:
461#endif
462
463 return ret;
464}
465
c0ef877b
PE		 466static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool)
467{
468 if (valbool)
469 sock_set_flag(sk, bit);
470 else
471 sock_reset_flag(sk, bit);
472}
473
1da177e4
LT		 474/*
475 * This is meant for all protocols to use and covers goings on
476 * at the socket level. Everything here is generic.
477 */
478
479int sock_setsockopt(struct socket *sock, int level, int optname,
b7058842 480 char __user *optval, unsigned int optlen)
1da177e4 481{
2a91525c 482 struct sock *sk = sock->sk;
1da177e4
LT		 483 int val;
484 int valbool;
485 struct linger ling;
486 int ret = 0;
4ec93edb 487
1da177e4
LT		 488 /*
489 * Options without arguments
490 */
491
4878809f
DM		 492 if (optname == SO_BINDTODEVICE)
493 return sock_bindtodevice(sk, optval, optlen);
494
e71a4783
SH		 495 if (optlen < sizeof(int))
496 return -EINVAL;
4ec93edb 497
1da177e4
LT		 498 if (get_user(val, (int __user *)optval))
499 return -EFAULT;
4ec93edb 500
2a91525c 501 valbool = val ? 1 : 0;
1da177e4
LT		 502
503 lock_sock(sk);
504
2a91525c 505 switch (optname) {
e71a4783 506 case SO_DEBUG:
2a91525c 507 if (val && !capable(CAP_NET_ADMIN))
e71a4783 508 ret = -EACCES;
2a91525c 509 else
c0ef877b 510 sock_valbool_flag(sk, SOCK_DBG, valbool);
e71a4783
SH		 511 break;
512 case SO_REUSEADDR:
513 sk->sk_reuse = valbool;
514 break;
515 case SO_TYPE:
49c794e9 516 case SO_PROTOCOL:
0d6038ee 517 case SO_DOMAIN:
e71a4783
SH		 518 case SO_ERROR:
519 ret = -ENOPROTOOPT;
520 break;
521 case SO_DONTROUTE:
c0ef877b 522 sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool);
e71a4783
SH		 523 break;
524 case SO_BROADCAST:
525 sock_valbool_flag(sk, SOCK_BROADCAST, valbool);
526 break;
527 case SO_SNDBUF:
528 /* Don't error on this BSD doesn't and if you think
529 about it this is right. Otherwise apps have to
530 play 'guess the biggest size' games. RCVBUF/SNDBUF
531 are treated in BSD as hints */
532
533 if (val > sysctl_wmem_max)
534 val = sysctl_wmem_max;
b0573dea 535set_sndbuf:
e71a4783
SH		 536 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
537 if ((val * 2) < SOCK_MIN_SNDBUF)
538 sk->sk_sndbuf = SOCK_MIN_SNDBUF;
539 else
540 sk->sk_sndbuf = val * 2;
1da177e4 541
e71a4783
SH		 542 /*
543 * Wake up sending tasks if we
544 * upped the value.
545 */
546 sk->sk_write_space(sk);
547 break;
1da177e4 548
e71a4783
SH		 549 case SO_SNDBUFFORCE:
550 if (!capable(CAP_NET_ADMIN)) {
551 ret = -EPERM;
552 break;
553 }
554 goto set_sndbuf;
b0573dea 555
e71a4783
SH		 556 case SO_RCVBUF:
557 /* Don't error on this BSD doesn't and if you think
558 about it this is right. Otherwise apps have to
559 play 'guess the biggest size' games. RCVBUF/SNDBUF
560 are treated in BSD as hints */
4ec93edb 561
e71a4783
SH		 562 if (val > sysctl_rmem_max)
563 val = sysctl_rmem_max;
b0573dea 564set_rcvbuf:
e71a4783
SH		 565 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
566 /*
567 * We double it on the way in to account for
568 * "struct sk_buff" etc. overhead. Applications
569 * assume that the SO_RCVBUF setting they make will
570 * allow that much actual data to be received on that
571 * socket.
572 *
573 * Applications are unaware that "struct sk_buff" and
574 * other overheads allocate from the receive buffer
575 * during socket buffer allocation.
576 *
577 * And after considering the possible alternatives,
578 * returning the value we actually used in getsockopt
579 * is the most desirable behavior.
580 */
581 if ((val * 2) < SOCK_MIN_RCVBUF)
582 sk->sk_rcvbuf = SOCK_MIN_RCVBUF;
583 else
584 sk->sk_rcvbuf = val * 2;
585 break;
586
587 case SO_RCVBUFFORCE:
588 if (!capable(CAP_NET_ADMIN)) {
589 ret = -EPERM;
1da177e4 590 break;
e71a4783
SH		 591 }
592 goto set_rcvbuf;
1da177e4 593
e71a4783 594 case SO_KEEPALIVE:
1da177e4 595#ifdef CONFIG_INET
e71a4783
SH		 596 if (sk->sk_protocol == IPPROTO_TCP)
597 tcp_set_keepalive(sk, valbool);
1da177e4 598#endif
e71a4783
SH		 599 sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool);
600 break;
601
602 case SO_OOBINLINE:
603 sock_valbool_flag(sk, SOCK_URGINLINE, valbool);
604 break;
605
606 case SO_NO_CHECK:
607 sk->sk_no_check = valbool;
608 break;
609
610 case SO_PRIORITY:
611 if ((val >= 0 && val <= 6) || capable(CAP_NET_ADMIN))
612 sk->sk_priority = val;
613 else
614 ret = -EPERM;
615 break;
616
617 case SO_LINGER:
618 if (optlen < sizeof(ling)) {
619 ret = -EINVAL; /* 1003.1g */
1da177e4 620 break;
e71a4783 621 }
2a91525c 622 if (copy_from_user(&ling, optval, sizeof(ling))) {
e71a4783 623 ret = -EFAULT;
1da177e4 624 break;
e71a4783
SH		 625 }
626 if (!ling.l_onoff)
627 sock_reset_flag(sk, SOCK_LINGER);
628 else {
1da177e4 629#if (BITS_PER_LONG == 32)
e71a4783
SH		 630 if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ)
631 sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT;
1da177e4 632 else
e71a4783
SH		 633#endif
634 sk->sk_lingertime = (unsigned int)ling.l_linger * HZ;
635 sock_set_flag(sk, SOCK_LINGER);
636 }
637 break;
638
639 case SO_BSDCOMPAT:
640 sock_warn_obsolete_bsdism("setsockopt");
641 break;
642
643 case SO_PASSCRED:
644 if (valbool)
645 set_bit(SOCK_PASSCRED, &sock->flags);
646 else
647 clear_bit(SOCK_PASSCRED, &sock->flags);
648 break;
649
650 case SO_TIMESTAMP:
92f37fd2 651 case SO_TIMESTAMPNS:
e71a4783 652 if (valbool) {
92f37fd2
ED		 653 if (optname == SO_TIMESTAMP)
654 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
655 else
656 sock_set_flag(sk, SOCK_RCVTSTAMPNS);
e71a4783 657 sock_set_flag(sk, SOCK_RCVTSTAMP);
20d49473 658 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
92f37fd2 659 } else {
e71a4783 660 sock_reset_flag(sk, SOCK_RCVTSTAMP);
92f37fd2
ED		 661 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
662 }
e71a4783
SH		 663 break;
664
20d49473
PO		 665 case SO_TIMESTAMPING:
666 if (val & ~SOF_TIMESTAMPING_MASK) {
f249fb78 667 ret = -EINVAL;
20d49473
PO		 668 break;
669 }
670 sock_valbool_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE,
671 val & SOF_TIMESTAMPING_TX_HARDWARE);
672 sock_valbool_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE,
673 val & SOF_TIMESTAMPING_TX_SOFTWARE);
674 sock_valbool_flag(sk, SOCK_TIMESTAMPING_RX_HARDWARE,
675 val & SOF_TIMESTAMPING_RX_HARDWARE);
676 if (val & SOF_TIMESTAMPING_RX_SOFTWARE)
677 sock_enable_timestamp(sk,
678 SOCK_TIMESTAMPING_RX_SOFTWARE);
679 else
680 sock_disable_timestamp(sk,
681 SOCK_TIMESTAMPING_RX_SOFTWARE);
682 sock_valbool_flag(sk, SOCK_TIMESTAMPING_SOFTWARE,
683 val & SOF_TIMESTAMPING_SOFTWARE);
684 sock_valbool_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE,
685 val & SOF_TIMESTAMPING_SYS_HARDWARE);
686 sock_valbool_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE,
687 val & SOF_TIMESTAMPING_RAW_HARDWARE);
688 break;
689
e71a4783
SH		 690 case SO_RCVLOWAT:
691 if (val < 0)
692 val = INT_MAX;
693 sk->sk_rcvlowat = val ? : 1;
694 break;
695
696 case SO_RCVTIMEO:
697 ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen);
698 break;
699
700 case SO_SNDTIMEO:
701 ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen);
702 break;
1da177e4 703
e71a4783
SH		 704 case SO_ATTACH_FILTER:
705 ret = -EINVAL;
706 if (optlen == sizeof(struct sock_fprog)) {
707 struct sock_fprog fprog;
1da177e4 708
e71a4783
SH		 709 ret = -EFAULT;
710 if (copy_from_user(&fprog, optval, sizeof(fprog)))
1da177e4 711 break;
e71a4783
SH		 712
713 ret = sk_attach_filter(&fprog, sk);
714 }
715 break;
716
717 case SO_DETACH_FILTER:
55b33325 718 ret = sk_detach_filter(sk);
e71a4783 719 break;
1da177e4 720
e71a4783
SH		 721 case SO_PASSSEC:
722 if (valbool)
723 set_bit(SOCK_PASSSEC, &sock->flags);
724 else
725 clear_bit(SOCK_PASSSEC, &sock->flags);
726 break;
4a19ec58
LAT		 727 case SO_MARK:
728 if (!capable(CAP_NET_ADMIN))
729 ret = -EPERM;
2a91525c 730 else
4a19ec58 731 sk->sk_mark = val;
4a19ec58 732 break;
877ce7c1 733
1da177e4
LT		 734 /* We implement the SO_SNDLOWAT etc to
735 not be settable (1003.1g 5.3) */
3b885787
NH		 736 case SO_RXQ_OVFL:
737 if (valbool)
738 sock_set_flag(sk, SOCK_RXQ_OVFL);
739 else
740 sock_reset_flag(sk, SOCK_RXQ_OVFL);
741 break;
e71a4783
SH		 742 default:
743 ret = -ENOPROTOOPT;
744 break;
4ec93edb 745 }
1da177e4
LT		 746 release_sock(sk);
747 return ret;
748}
2a91525c 749EXPORT_SYMBOL(sock_setsockopt);
1da177e4
LT		 750
751
752int sock_getsockopt(struct socket *sock, int level, int optname,
753 char __user *optval, int __user *optlen)
754{
755 struct sock *sk = sock->sk;
4ec93edb 756
e71a4783 757 union {
4ec93edb
YH		 758 int val;
759 struct linger ling;
1da177e4
LT		 760 struct timeval tm;
761 } v;
4ec93edb 762
4d0392be 763 int lv = sizeof(int);
1da177e4 764 int len;
4ec93edb 765
e71a4783 766 if (get_user(len, optlen))
4ec93edb 767 return -EFAULT;
e71a4783 768 if (len < 0)
1da177e4 769 return -EINVAL;
4ec93edb 770
50fee1de 771 memset(&v, 0, sizeof(v));
df0bca04 772
2a91525c 773 switch (optname) {
e71a4783
SH		 774 case SO_DEBUG:
775 v.val = sock_flag(sk, SOCK_DBG);
776 break;
777
778 case SO_DONTROUTE:
779 v.val = sock_flag(sk, SOCK_LOCALROUTE);
780 break;
781
782 case SO_BROADCAST:
783 v.val = !!sock_flag(sk, SOCK_BROADCAST);
784 break;
785
786 case SO_SNDBUF:
787 v.val = sk->sk_sndbuf;
788 break;
789
790 case SO_RCVBUF:
791 v.val = sk->sk_rcvbuf;
792 break;
793
794 case SO_REUSEADDR:
795 v.val = sk->sk_reuse;
796 break;
797
798 case SO_KEEPALIVE:
799 v.val = !!sock_flag(sk, SOCK_KEEPOPEN);
800 break;
801
802 case SO_TYPE:
803 v.val = sk->sk_type;
804 break;
805
49c794e9
JE		 806 case SO_PROTOCOL:
807 v.val = sk->sk_protocol;
808 break;
809
0d6038ee
JE		 810 case SO_DOMAIN:
811 v.val = sk->sk_family;
812 break;
813
e71a4783
SH		 814 case SO_ERROR:
815 v.val = -sock_error(sk);
2a91525c 816 if (v.val == 0)
e71a4783
SH		 817 v.val = xchg(&sk->sk_err_soft, 0);
818 break;
819
820 case SO_OOBINLINE:
821 v.val = !!sock_flag(sk, SOCK_URGINLINE);
822 break;
823
824 case SO_NO_CHECK:
825 v.val = sk->sk_no_check;
826 break;
827
828 case SO_PRIORITY:
829 v.val = sk->sk_priority;
830 break;
831
832 case SO_LINGER:
833 lv = sizeof(v.ling);
834 v.ling.l_onoff = !!sock_flag(sk, SOCK_LINGER);
835 v.ling.l_linger = sk->sk_lingertime / HZ;
836 break;
837
838 case SO_BSDCOMPAT:
839 sock_warn_obsolete_bsdism("getsockopt");
840 break;
841
842 case SO_TIMESTAMP:
92f37fd2
ED		 843 v.val = sock_flag(sk, SOCK_RCVTSTAMP) &&
844 !sock_flag(sk, SOCK_RCVTSTAMPNS);
845 break;
846
847 case SO_TIMESTAMPNS:
848 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS);
e71a4783
SH		 849 break;
850
20d49473
PO		 851 case SO_TIMESTAMPING:
852 v.val = 0;
853 if (sock_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE))
854 v.val |= SOF_TIMESTAMPING_TX_HARDWARE;
855 if (sock_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE))
856 v.val |= SOF_TIMESTAMPING_TX_SOFTWARE;
857 if (sock_flag(sk, SOCK_TIMESTAMPING_RX_HARDWARE))
858 v.val |= SOF_TIMESTAMPING_RX_HARDWARE;
859 if (sock_flag(sk, SOCK_TIMESTAMPING_RX_SOFTWARE))
860 v.val |= SOF_TIMESTAMPING_RX_SOFTWARE;
861 if (sock_flag(sk, SOCK_TIMESTAMPING_SOFTWARE))
862 v.val |= SOF_TIMESTAMPING_SOFTWARE;
863 if (sock_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE))
864 v.val |= SOF_TIMESTAMPING_SYS_HARDWARE;
865 if (sock_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE))
866 v.val |= SOF_TIMESTAMPING_RAW_HARDWARE;
867 break;
868
e71a4783 869 case SO_RCVTIMEO:
2a91525c 870 lv = sizeof(struct timeval);
e71a4783
SH		 871 if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) {
872 v.tm.tv_sec = 0;
873 v.tm.tv_usec = 0;
874 } else {
875 v.tm.tv_sec = sk->sk_rcvtimeo / HZ;
876 v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ;
877 }
878 break;
879
880 case SO_SNDTIMEO:
2a91525c 881 lv = sizeof(struct timeval);
e71a4783
SH		 882 if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) {
883 v.tm.tv_sec = 0;
884 v.tm.tv_usec = 0;
885 } else {
886 v.tm.tv_sec = sk->sk_sndtimeo / HZ;
887 v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ;
888 }
889 break;
1da177e4 890
e71a4783
SH		 891 case SO_RCVLOWAT:
892 v.val = sk->sk_rcvlowat;
893 break;
1da177e4 894
e71a4783 895 case SO_SNDLOWAT:
2a91525c 896 v.val = 1;
e71a4783 897 break;
1da177e4 898
e71a4783
SH		 899 case SO_PASSCRED:
900 v.val = test_bit(SOCK_PASSCRED, &sock->flags) ? 1 : 0;
901 break;
1da177e4 902
e71a4783
SH		 903 case SO_PEERCRED:
904 if (len > sizeof(sk->sk_peercred))
905 len = sizeof(sk->sk_peercred);
906 if (copy_to_user(optval, &sk->sk_peercred, len))
907 return -EFAULT;
908 goto lenout;
1da177e4 909
e71a4783
SH		 910 case SO_PEERNAME:
911 {
912 char address[128];
913
914 if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2))
915 return -ENOTCONN;
916 if (lv < len)
917 return -EINVAL;
918 if (copy_to_user(optval, address, len))
919 return -EFAULT;
920 goto lenout;
921 }
1da177e4 922
e71a4783
SH		 923 /* Dubious BSD thing... Probably nobody even uses it, but
924 * the UNIX standard wants it for whatever reason... -DaveM
925 */
926 case SO_ACCEPTCONN:
927 v.val = sk->sk_state == TCP_LISTEN;
928 break;
1da177e4 929
e71a4783
SH		 930 case SO_PASSSEC:
931 v.val = test_bit(SOCK_PASSSEC, &sock->flags) ? 1 : 0;
932 break;
877ce7c1 933
e71a4783
SH		 934 case SO_PEERSEC:
935 return security_socket_getpeersec_stream(sock, optval, optlen, len);
1da177e4 936
4a19ec58
LAT		 937 case SO_MARK:
938 v.val = sk->sk_mark;
939 break;
940
3b885787
NH		 941 case SO_RXQ_OVFL:
942 v.val = !!sock_flag(sk, SOCK_RXQ_OVFL);
943 break;
944
e71a4783
SH		 945 default:
946 return -ENOPROTOOPT;
1da177e4 947 }
e71a4783 948
1da177e4
LT		 949 if (len > lv)
950 len = lv;
951 if (copy_to_user(optval, &v, len))
952 return -EFAULT;
953lenout:
4ec93edb
YH		 954 if (put_user(len, optlen))
955 return -EFAULT;
956 return 0;
1da177e4
LT		 957}
958
a5b5bb9a
IM		 959/*
960 * Initialize an sk_lock.
961 *
962 * (We also register the sk_lock with the lock validator.)
963 */
b6f99a21 964static inline void sock_lock_init(struct sock *sk)
a5b5bb9a 965{
ed07536e
PZ		 966 sock_lock_init_class_and_name(sk,
967 af_family_slock_key_strings[sk->sk_family],
968 af_family_slock_keys + sk->sk_family,
969 af_family_key_strings[sk->sk_family],
970 af_family_keys + sk->sk_family);
a5b5bb9a
IM		 971}
972
4dc6dc71
ED		 973/*
974 * Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet,
975 * even temporarly, because of RCU lookups. sk_node should also be left as is.
976 */
f1a6c4da
PE		 977static void sock_copy(struct sock *nsk, const struct sock *osk)
978{
979#ifdef CONFIG_SECURITY_NETWORK
980 void *sptr = nsk->sk_security;
981#endif
4dc6dc71 982 BUILD_BUG_ON(offsetof(struct sock, sk_copy_start) !=
e022f0b4
KK		 983 sizeof(osk->sk_node) + sizeof(osk->sk_refcnt) +
984 sizeof(osk->sk_tx_queue_mapping));
4dc6dc71
ED		 985 memcpy(&nsk->sk_copy_start, &osk->sk_copy_start,
986 osk->sk_prot->obj_size - offsetof(struct sock, sk_copy_start));
f1a6c4da
PE		 987#ifdef CONFIG_SECURITY_NETWORK
988 nsk->sk_security = sptr;
989 security_sk_clone(osk, nsk);
990#endif
991}
992
2e4afe7b
PE		 993static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority,
994 int family)
c308c1b2
PE		 995{
996 struct sock *sk;
997 struct kmem_cache *slab;
998
999 slab = prot->slab;
e912b114
ED		 1000 if (slab != NULL) {
1001 sk = kmem_cache_alloc(slab, priority & ~__GFP_ZERO);
1002 if (!sk)
1003 return sk;
1004 if (priority & __GFP_ZERO) {
1005 /*
1006 * caches using SLAB_DESTROY_BY_RCU should let
1007 * sk_node.next un-modified. Special care is taken
1008 * when initializing object to zero.
1009 */
1010 if (offsetof(struct sock, sk_node.next) != 0)
1011 memset(sk, 0, offsetof(struct sock, sk_node.next));
1012 memset(&sk->sk_node.pprev, 0,
1013 prot->obj_size - offsetof(struct sock,
1014 sk_node.pprev));
1015 }
1016 }
c308c1b2
PE		 1017 else
1018 sk = kmalloc(prot->obj_size, priority);
1019
2e4afe7b 1020 if (sk != NULL) {
a98b65a3
VN		 1021 kmemcheck_annotate_bitfield(sk, flags);
1022
2e4afe7b
PE		 1023 if (security_sk_alloc(sk, family, priority))
1024 goto out_free;
1025
1026 if (!try_module_get(prot->owner))
1027 goto out_free_sec;
e022f0b4 1028 sk_tx_queue_clear(sk);
2e4afe7b
PE		 1029 }
1030
c308c1b2 1031 return sk;
2e4afe7b
PE		 1032
1033out_free_sec:
1034 security_sk_free(sk);
1035out_free:
1036 if (slab != NULL)
1037 kmem_cache_free(slab, sk);
1038 else
1039 kfree(sk);
1040 return NULL;
c308c1b2
PE		 1041}
1042
1043static void sk_prot_free(struct proto *prot, struct sock *sk)
1044{
1045 struct kmem_cache *slab;
2e4afe7b 1046 struct module *owner;
c308c1b2 1047
2e4afe7b 1048 owner = prot->owner;
c308c1b2 1049 slab = prot->slab;
2e4afe7b
PE		 1050
1051 security_sk_free(sk);
c308c1b2
PE		 1052 if (slab != NULL)
1053 kmem_cache_free(slab, sk);
1054 else
1055 kfree(sk);
2e4afe7b 1056 module_put(owner);
c308c1b2
PE		 1057}
1058
f8451725
HX		 1059#ifdef CONFIG_CGROUPS
1060void sock_update_classid(struct sock *sk)
1061{
1062 u32 classid = task_cls_classid(current);
1063
1064 if (classid && classid != sk->sk_classid)
1065 sk->sk_classid = classid;
1066}
1067#endif
1068
1da177e4
LT		 1069/**
1070 * sk_alloc - All socket objects are allocated here
c4ea43c5 1071 * @net: the applicable net namespace
4dc3b16b
PP		 1072 * @family: protocol family
1073 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1074 * @prot: struct proto associated with this new sock instance
1da177e4 1075 */
1b8d7ae4 1076struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
6257ff21 1077 struct proto *prot)
1da177e4 1078{
c308c1b2 1079 struct sock *sk;
1da177e4 1080
154adbc8 1081 sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family);
1da177e4 1082 if (sk) {
154adbc8
PE		 1083 sk->sk_family = family;
1084 /*
1085 * See comment in struct sock definition to understand
1086 * why we need sk_prot_creator -acme
1087 */
1088 sk->sk_prot = sk->sk_prot_creator = prot;
1089 sock_lock_init(sk);
3b1e0a65 1090 sock_net_set(sk, get_net(net));
d66ee058 1091 atomic_set(&sk->sk_wmem_alloc, 1);
f8451725
HX		 1092
1093 sock_update_classid(sk);
1da177e4 1094 }
a79af59e 1095
2e4afe7b 1096 return sk;
1da177e4 1097}
2a91525c 1098EXPORT_SYMBOL(sk_alloc);
1da177e4 1099
2b85a34e 1100static void __sk_free(struct sock *sk)
1da177e4
LT		 1101{
1102 struct sk_filter *filter;
1da177e4
LT		 1103
1104 if (sk->sk_destruct)
1105 sk->sk_destruct(sk);
1106
a898def2
PM		 1107 filter = rcu_dereference_check(sk->sk_filter,
1108 atomic_read(&sk->sk_wmem_alloc) == 0);
1da177e4 1109 if (filter) {
309dd5fc 1110 sk_filter_uncharge(sk, filter);
fda9ef5d 1111 rcu_assign_pointer(sk->sk_filter, NULL);
1da177e4
LT		 1112 }
1113
20d49473
PO		 1114 sock_disable_timestamp(sk, SOCK_TIMESTAMP);
1115 sock_disable_timestamp(sk, SOCK_TIMESTAMPING_RX_SOFTWARE);
1da177e4
LT		 1116
1117 if (atomic_read(&sk->sk_omem_alloc))
1118 printk(KERN_DEBUG "%s: optmem leakage (%d bytes) detected.\n",
0dc47877 1119 __func__, atomic_read(&sk->sk_omem_alloc));
1da177e4 1120
3b1e0a65 1121 put_net(sock_net(sk));
c308c1b2 1122 sk_prot_free(sk->sk_prot_creator, sk);
1da177e4 1123}
2b85a34e
ED		 1124
1125void sk_free(struct sock *sk)
1126{
1127 /*
1128 * We substract one from sk_wmem_alloc and can know if
1129 * some packets are still in some tx queue.
1130 * If not null, sock_wfree() will call __sk_free(sk) later
1131 */
1132 if (atomic_dec_and_test(&sk->sk_wmem_alloc))
1133 __sk_free(sk);
1134}
2a91525c 1135EXPORT_SYMBOL(sk_free);
1da177e4 1136
edf02087
DL		 1137/*
1138 * Last sock_put should drop referrence to sk->sk_net. It has already
1139 * been dropped in sk_change_net. Taking referrence to stopping namespace
1140 * is not an option.
1141 * Take referrence to a socket to remove it from hash _alive_ and after that
1142 * destroy it in the context of init_net.
1143 */
1144void sk_release_kernel(struct sock *sk)
1145{
1146 if (sk == NULL || sk->sk_socket == NULL)
1147 return;
1148
1149 sock_hold(sk);
1150 sock_release(sk->sk_socket);
65a18ec5 1151 release_net(sock_net(sk));
3b1e0a65 1152 sock_net_set(sk, get_net(&init_net));
edf02087
DL		 1153 sock_put(sk);
1154}
45af1754 1155EXPORT_SYMBOL(sk_release_kernel);
edf02087 1156
dd0fc66f 1157struct sock *sk_clone(const struct sock *sk, const gfp_t priority)
87d11ceb 1158{
8fd1d178 1159 struct sock *newsk;
87d11ceb 1160
8fd1d178 1161 newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family);
87d11ceb
ACM		 1162 if (newsk != NULL) {
1163 struct sk_filter *filter;
1164
892c141e 1165 sock_copy(newsk, sk);
87d11ceb
ACM		 1166
1167 /* SANITY */
3b1e0a65 1168 get_net(sock_net(newsk));
87d11ceb
ACM		 1169 sk_node_init(&newsk->sk_node);
1170 sock_lock_init(newsk);
1171 bh_lock_sock(newsk);
fa438ccf 1172 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL;
8eae939f 1173 newsk->sk_backlog.len = 0;
87d11ceb
ACM		 1174
1175 atomic_set(&newsk->sk_rmem_alloc, 0);
2b85a34e
ED		 1176 /*
1177 * sk_wmem_alloc set to one (see sk_free() and sock_wfree())
1178 */
1179 atomic_set(&newsk->sk_wmem_alloc, 1);
87d11ceb
ACM		 1180 atomic_set(&newsk->sk_omem_alloc, 0);
1181 skb_queue_head_init(&newsk->sk_receive_queue);
1182 skb_queue_head_init(&newsk->sk_write_queue);
97fc2f08
CL		 1183#ifdef CONFIG_NET_DMA
1184 skb_queue_head_init(&newsk->sk_async_wait_queue);
1185#endif
87d11ceb 1186
b6c6712a 1187 spin_lock_init(&newsk->sk_dst_lock);
87d11ceb 1188 rwlock_init(&newsk->sk_callback_lock);
443aef0e
PZ		 1189 lockdep_set_class_and_name(&newsk->sk_callback_lock,
1190 af_callback_keys + newsk->sk_family,
1191 af_family_clock_key_strings[newsk->sk_family]);
87d11ceb
ACM		 1192
1193 newsk->sk_dst_cache = NULL;
1194 newsk->sk_wmem_queued = 0;
1195 newsk->sk_forward_alloc = 0;
1196 newsk->sk_send_head = NULL;
87d11ceb
ACM		 1197 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
1198
1199 sock_reset_flag(newsk, SOCK_DONE);
1200 skb_queue_head_init(&newsk->sk_error_queue);
1201
1202 filter = newsk->sk_filter;
1203 if (filter != NULL)
1204 sk_filter_charge(newsk, filter);
1205
1206 if (unlikely(xfrm_sk_clone_policy(newsk))) {
1207 /* It is still raw copy of parent, so invalidate
1208 * destructor and make plain sk_free() */
1209 newsk->sk_destruct = NULL;
1210 sk_free(newsk);
1211 newsk = NULL;
1212 goto out;
1213 }
1214
1215 newsk->sk_err = 0;
1216 newsk->sk_priority = 0;
4dc6dc71
ED		 1217 /*
1218 * Before updating sk_refcnt, we must commit prior changes to memory
1219 * (Documentation/RCU/rculist_nulls.txt for details)
1220 */
1221 smp_wmb();
87d11ceb
ACM		 1222 atomic_set(&newsk->sk_refcnt, 2);
1223
1224 /*
1225 * Increment the counter in the same struct proto as the master
1226 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
1227 * is the same as sk->sk_prot->socks, as this field was copied
1228 * with memcpy).
1229 *
1230 * This _changes_ the previous behaviour, where
1231 * tcp_create_openreq_child always was incrementing the
1232 * equivalent to tcp_prot->socks (inet_sock_nr), so this have
1233 * to be taken into account in all callers. -acme
1234 */
1235 sk_refcnt_debug_inc(newsk);
972692e0 1236 sk_set_socket(newsk, NULL);
43815482 1237 newsk->sk_wq = NULL;
87d11ceb
ACM		 1238
1239 if (newsk->sk_prot->sockets_allocated)
1748376b 1240 percpu_counter_inc(newsk->sk_prot->sockets_allocated);
704da560
OP		 1241
1242 if (sock_flag(newsk, SOCK_TIMESTAMP) ||
1243 sock_flag(newsk, SOCK_TIMESTAMPING_RX_SOFTWARE))
1244 net_enable_timestamp();
87d11ceb
ACM		 1245 }
1246out:
1247 return newsk;
1248}
87d11ceb
ACM		 1249EXPORT_SYMBOL_GPL(sk_clone);
1250
9958089a
AK		 1251void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
1252{
1253 __sk_dst_set(sk, dst);
1254 sk->sk_route_caps = dst->dev->features;
1255 if (sk->sk_route_caps & NETIF_F_GSO)
4fcd6b99 1256 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE;
a465419b 1257 sk->sk_route_caps &= ~sk->sk_route_nocaps;
9958089a 1258 if (sk_can_gso(sk)) {
82cc1a7a 1259 if (dst->header_len) {
9958089a 1260 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
82cc1a7a 1261 } else {
9958089a 1262 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
82cc1a7a
PWJ		 1263 sk->sk_gso_max_size = dst->dev->gso_max_size;
1264 }
9958089a
AK		 1265 }
1266}
1267EXPORT_SYMBOL_GPL(sk_setup_caps);
1268
1da177e4
LT		 1269void __init sk_init(void)
1270{
4481374c 1271 if (totalram_pages <= 4096) {
1da177e4
LT		 1272 sysctl_wmem_max = 32767;
1273 sysctl_rmem_max = 32767;
1274 sysctl_wmem_default = 32767;
1275 sysctl_rmem_default = 32767;
4481374c 1276 } else if (totalram_pages >= 131072) {
1da177e4
LT		 1277 sysctl_wmem_max = 131071;
1278 sysctl_rmem_max = 131071;
1279 }
1280}
1281
1282/*
1283 * Simple resource managers for sockets.
1284 */
1285
1286
4ec93edb
YH		 1287/*
1288 * Write buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1289 */
1290void sock_wfree(struct sk_buff *skb)
1291{
1292 struct sock *sk = skb->sk;
d99927f4 1293 unsigned int len = skb->truesize;
1da177e4 1294
d99927f4
ED		 1295 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) {
1296 /*
1297 * Keep a reference on sk_wmem_alloc, this will be released
1298 * after sk_write_space() call
1299 */
1300 atomic_sub(len - 1, &sk->sk_wmem_alloc);
1da177e4 1301 sk->sk_write_space(sk);
d99927f4
ED		 1302 len = 1;
1303 }
2b85a34e 1304 /*
d99927f4
ED		 1305 * if sk_wmem_alloc reaches 0, we must finish what sk_free()
1306 * could not do because of in-flight packets
2b85a34e 1307 */
d99927f4 1308 if (atomic_sub_and_test(len, &sk->sk_wmem_alloc))
2b85a34e 1309 __sk_free(sk);
1da177e4 1310}
2a91525c 1311EXPORT_SYMBOL(sock_wfree);
1da177e4 1312
4ec93edb
YH		 1313/*
1314 * Read buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1315 */
1316void sock_rfree(struct sk_buff *skb)
1317{
1318 struct sock *sk = skb->sk;
1319
1320 atomic_sub(skb->truesize, &sk->sk_rmem_alloc);
3ab224be 1321 sk_mem_uncharge(skb->sk, skb->truesize);
1da177e4 1322}
2a91525c 1323EXPORT_SYMBOL(sock_rfree);
1da177e4
LT		 1324
1325
1326int sock_i_uid(struct sock *sk)
1327{
1328 int uid;
1329
1330 read_lock(&sk->sk_callback_lock);
1331 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : 0;
1332 read_unlock(&sk->sk_callback_lock);
1333 return uid;
1334}
2a91525c 1335EXPORT_SYMBOL(sock_i_uid);
1da177e4
LT		 1336
1337unsigned long sock_i_ino(struct sock *sk)
1338{
1339 unsigned long ino;
1340
1341 read_lock(&sk->sk_callback_lock);
1342 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
1343 read_unlock(&sk->sk_callback_lock);
1344 return ino;
1345}
2a91525c 1346EXPORT_SYMBOL(sock_i_ino);
1da177e4
LT		 1347
1348/*
1349 * Allocate a skb from the socket's send buffer.
1350 */
86a76caf 1351struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
dd0fc66f 1352 gfp_t priority)
1da177e4
LT		 1353{
1354 if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
2a91525c 1355 struct sk_buff *skb = alloc_skb(size, priority);
1da177e4
LT		 1356 if (skb) {
1357 skb_set_owner_w(skb, sk);
1358 return skb;
1359 }
1360 }
1361 return NULL;
1362}
2a91525c 1363EXPORT_SYMBOL(sock_wmalloc);
1da177e4
LT		 1364
1365/*
1366 * Allocate a skb from the socket's receive buffer.
4ec93edb 1367 */
86a76caf 1368struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force,
dd0fc66f 1369 gfp_t priority)
1da177e4
LT		 1370{
1371 if (force || atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) {
1372 struct sk_buff *skb = alloc_skb(size, priority);
1373 if (skb) {
1374 skb_set_owner_r(skb, sk);
1375 return skb;
1376 }
1377 }
1378 return NULL;
1379}
1380
4ec93edb 1381/*
1da177e4 1382 * Allocate a memory block from the socket's option memory buffer.
4ec93edb 1383 */
dd0fc66f 1384void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
1da177e4
LT		 1385{
1386 if ((unsigned)size <= sysctl_optmem_max &&
1387 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) {
1388 void *mem;
1389 /* First do the add, to avoid the race if kmalloc
4ec93edb 1390 * might sleep.
1da177e4
LT		 1391 */
1392 atomic_add(size, &sk->sk_omem_alloc);
1393 mem = kmalloc(size, priority);
1394 if (mem)
1395 return mem;
1396 atomic_sub(size, &sk->sk_omem_alloc);
1397 }
1398 return NULL;
1399}
2a91525c 1400EXPORT_SYMBOL(sock_kmalloc);
1da177e4
LT		 1401
1402/*
1403 * Free an option memory block.
1404 */
1405void sock_kfree_s(struct sock *sk, void *mem, int size)
1406{
1407 kfree(mem);
1408 atomic_sub(size, &sk->sk_omem_alloc);
1409}
2a91525c 1410EXPORT_SYMBOL(sock_kfree_s);
1da177e4
LT		 1411
1412/* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
1413 I think, these locks should be removed for datagram sockets.
1414 */
2a91525c 1415static long sock_wait_for_wmem(struct sock *sk, long timeo)
1da177e4
LT		 1416{
1417 DEFINE_WAIT(wait);
1418
1419 clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1420 for (;;) {
1421 if (!timeo)
1422 break;
1423 if (signal_pending(current))
1424 break;
1425 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
aa395145 1426 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1da177e4
LT		 1427 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf)
1428 break;
1429 if (sk->sk_shutdown & SEND_SHUTDOWN)
1430 break;
1431 if (sk->sk_err)
1432 break;
1433 timeo = schedule_timeout(timeo);
1434 }
aa395145 1435 finish_wait(sk_sleep(sk), &wait);
1da177e4
LT		 1436 return timeo;
1437}
1438
1439
1440/*
1441 * Generic send/receive buffer handlers
1442 */
1443
4cc7f68d
HX		 1444struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len,
1445 unsigned long data_len, int noblock,
1446 int *errcode)
1da177e4
LT		 1447{
1448 struct sk_buff *skb;
7d877f3b 1449 gfp_t gfp_mask;
1da177e4
LT		 1450 long timeo;
1451 int err;
1452
1453 gfp_mask = sk->sk_allocation;
1454 if (gfp_mask & __GFP_WAIT)
1455 gfp_mask |= __GFP_REPEAT;
1456
1457 timeo = sock_sndtimeo(sk, noblock);
1458 while (1) {
1459 err = sock_error(sk);
1460 if (err != 0)
1461 goto failure;
1462
1463 err = -EPIPE;
1464 if (sk->sk_shutdown & SEND_SHUTDOWN)
1465 goto failure;
1466
1467 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
db38c179 1468 skb = alloc_skb(header_len, gfp_mask);
1da177e4
LT		 1469 if (skb) {
1470 int npages;
1471 int i;
1472
1473 /* No pages, we're done... */
1474 if (!data_len)
1475 break;
1476
1477 npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
1478 skb->truesize += data_len;
1479 skb_shinfo(skb)->nr_frags = npages;
1480 for (i = 0; i < npages; i++) {
1481 struct page *page;
1482 skb_frag_t *frag;
1483
1484 page = alloc_pages(sk->sk_allocation, 0);
1485 if (!page) {
1486 err = -ENOBUFS;
1487 skb_shinfo(skb)->nr_frags = i;
1488 kfree_skb(skb);
1489 goto failure;
1490 }
1491
1492 frag = &skb_shinfo(skb)->frags[i];
1493 frag->page = page;
1494 frag->page_offset = 0;
1495 frag->size = (data_len >= PAGE_SIZE ?
1496 PAGE_SIZE :
1497 data_len);
1498 data_len -= PAGE_SIZE;
1499 }
1500
1501 /* Full success... */
1502 break;
1503 }
1504 err = -ENOBUFS;
1505 goto failure;
1506 }
1507 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1508 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1509 err = -EAGAIN;
1510 if (!timeo)
1511 goto failure;
1512 if (signal_pending(current))
1513 goto interrupted;
1514 timeo = sock_wait_for_wmem(sk, timeo);
1515 }
1516
1517 skb_set_owner_w(skb, sk);
1518 return skb;
1519
1520interrupted:
1521 err = sock_intr_errno(timeo);
1522failure:
1523 *errcode = err;
1524 return NULL;
1525}
4cc7f68d 1526EXPORT_SYMBOL(sock_alloc_send_pskb);
1da177e4 1527
4ec93edb 1528struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
1da177e4
LT		 1529 int noblock, int *errcode)
1530{
1531 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode);
1532}
2a91525c 1533EXPORT_SYMBOL(sock_alloc_send_skb);
1da177e4
LT		 1534
1535static void __lock_sock(struct sock *sk)
1536{
1537 DEFINE_WAIT(wait);
1538
e71a4783 1539 for (;;) {
1da177e4
LT		 1540 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
1541 TASK_UNINTERRUPTIBLE);
1542 spin_unlock_bh(&sk->sk_lock.slock);
1543 schedule();
1544 spin_lock_bh(&sk->sk_lock.slock);
e71a4783 1545 if (!sock_owned_by_user(sk))
1da177e4
LT		 1546 break;
1547 }
1548 finish_wait(&sk->sk_lock.wq, &wait);
1549}
1550
1551static void __release_sock(struct sock *sk)
1552{
1553 struct sk_buff *skb = sk->sk_backlog.head;
1554
1555 do {
1556 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
1557 bh_unlock_sock(sk);
1558
1559 do {
1560 struct sk_buff *next = skb->next;
1561
7fee226a 1562 WARN_ON_ONCE(skb_dst_is_noref(skb));
1da177e4 1563 skb->next = NULL;
c57943a1 1564 sk_backlog_rcv(sk, skb);
1da177e4
LT		 1565
1566 /*
1567 * We are in process context here with softirqs
1568 * disabled, use cond_resched_softirq() to preempt.
1569 * This is safe to do because we've taken the backlog
1570 * queue private:
1571 */
1572 cond_resched_softirq();
1573
1574 skb = next;
1575 } while (skb != NULL);
1576
1577 bh_lock_sock(sk);
e71a4783 1578 } while ((skb = sk->sk_backlog.head) != NULL);
8eae939f
ZY		 1579
1580 /*
1581 * Doing the zeroing here guarantee we can not loop forever
1582 * while a wild producer attempts to flood us.
1583 */
1584 sk->sk_backlog.len = 0;
1da177e4
LT		 1585}
1586
1587/**
1588 * sk_wait_data - wait for data to arrive at sk_receive_queue
4dc3b16b
PP		 1589 * @sk: sock to wait on
1590 * @timeo: for how long
1da177e4
LT		 1591 *
1592 * Now socket state including sk->sk_err is changed only under lock,
1593 * hence we may omit checks after joining wait queue.
1594 * We check receive queue before schedule() only as optimization;
1595 * it is very likely that release_sock() added new data.
1596 */
1597int sk_wait_data(struct sock *sk, long *timeo)
1598{
1599 int rc;
1600 DEFINE_WAIT(wait);
1601
aa395145 1602 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1da177e4
LT		 1603 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1604 rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue));
1605 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
aa395145 1606 finish_wait(sk_sleep(sk), &wait);
1da177e4
LT		 1607 return rc;
1608}
1da177e4
LT		 1609EXPORT_SYMBOL(sk_wait_data);
1610
3ab224be
HA		 1611/**
1612 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated
1613 * @sk: socket
1614 * @size: memory size to allocate
1615 * @kind: allocation type
1616 *
1617 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means
1618 * rmem allocation. This function assumes that protocols which have
1619 * memory_pressure use sk_wmem_queued as write buffer accounting.
1620 */
1621int __sk_mem_schedule(struct sock *sk, int size, int kind)
1622{
1623 struct proto *prot = sk->sk_prot;
1624 int amt = sk_mem_pages(size);
1625 int allocated;
1626
1627 sk->sk_forward_alloc += amt * SK_MEM_QUANTUM;
1628 allocated = atomic_add_return(amt, prot->memory_allocated);
1629
1630 /* Under limit. */
1631 if (allocated <= prot->sysctl_mem[0]) {
1632 if (prot->memory_pressure && *prot->memory_pressure)
1633 *prot->memory_pressure = 0;
1634 return 1;
1635 }
1636
1637 /* Under pressure. */
1638 if (allocated > prot->sysctl_mem[1])
1639 if (prot->enter_memory_pressure)
5c52ba17 1640 prot->enter_memory_pressure(sk);
3ab224be
HA		 1641
1642 /* Over hard limit. */
1643 if (allocated > prot->sysctl_mem[2])
1644 goto suppress_allocation;
1645
1646 /* guarantee minimum buffer size under pressure */
1647 if (kind == SK_MEM_RECV) {
1648 if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0])
1649 return 1;
1650 } else { /* SK_MEM_SEND */
1651 if (sk->sk_type == SOCK_STREAM) {
1652 if (sk->sk_wmem_queued < prot->sysctl_wmem[0])
1653 return 1;
1654 } else if (atomic_read(&sk->sk_wmem_alloc) <
1655 prot->sysctl_wmem[0])
1656 return 1;
1657 }
1658
1659 if (prot->memory_pressure) {
1748376b
ED		 1660 int alloc;
1661
1662 if (!*prot->memory_pressure)
1663 return 1;
1664 alloc = percpu_counter_read_positive(prot->sockets_allocated);
1665 if (prot->sysctl_mem[2] > alloc *
3ab224be
HA		 1666 sk_mem_pages(sk->sk_wmem_queued +
1667 atomic_read(&sk->sk_rmem_alloc) +
1668 sk->sk_forward_alloc))
1669 return 1;
1670 }
1671
1672suppress_allocation:
1673
1674 if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) {
1675 sk_stream_moderate_sndbuf(sk);
1676
1677 /* Fail only if socket is _under_ its sndbuf.
1678 * In this case we cannot block, so that we have to fail.
1679 */
1680 if (sk->sk_wmem_queued + size >= sk->sk_sndbuf)
1681 return 1;
1682 }
1683
1684 /* Alas. Undo changes. */
1685 sk->sk_forward_alloc -= amt * SK_MEM_QUANTUM;
1686 atomic_sub(amt, prot->memory_allocated);
1687 return 0;
1688}
3ab224be
HA		 1689EXPORT_SYMBOL(__sk_mem_schedule);
1690
1691/**
1692 * __sk_reclaim - reclaim memory_allocated
1693 * @sk: socket
1694 */
1695void __sk_mem_reclaim(struct sock *sk)
1696{
1697 struct proto *prot = sk->sk_prot;
1698
680a5a50 1699 atomic_sub(sk->sk_forward_alloc >> SK_MEM_QUANTUM_SHIFT,
3ab224be
HA		 1700 prot->memory_allocated);
1701 sk->sk_forward_alloc &= SK_MEM_QUANTUM - 1;
1702
1703 if (prot->memory_pressure && *prot->memory_pressure &&
1704 (atomic_read(prot->memory_allocated) < prot->sysctl_mem[0]))
1705 *prot->memory_pressure = 0;
1706}
3ab224be
HA		 1707EXPORT_SYMBOL(__sk_mem_reclaim);
1708
1709
1da177e4
LT		 1710/*
1711 * Set of default routines for initialising struct proto_ops when
1712 * the protocol does not support a particular function. In certain
1713 * cases where it makes no sense for a protocol to have a "do nothing"
1714 * function, some default processing is provided.
1715 */
1716
1717int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
1718{
1719 return -EOPNOTSUPP;
1720}
2a91525c 1721EXPORT_SYMBOL(sock_no_bind);
1da177e4 1722
4ec93edb 1723int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 1724 int len, int flags)
1725{
1726 return -EOPNOTSUPP;
1727}
2a91525c 1728EXPORT_SYMBOL(sock_no_connect);
1da177e4
LT		 1729
1730int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
1731{
1732 return -EOPNOTSUPP;
1733}
2a91525c 1734EXPORT_SYMBOL(sock_no_socketpair);
1da177e4
LT		 1735
1736int sock_no_accept(struct socket *sock, struct socket *newsock, int flags)
1737{
1738 return -EOPNOTSUPP;
1739}
2a91525c 1740EXPORT_SYMBOL(sock_no_accept);
1da177e4 1741
4ec93edb 1742int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 1743 int *len, int peer)
1744{
1745 return -EOPNOTSUPP;
1746}
2a91525c 1747EXPORT_SYMBOL(sock_no_getname);
1da177e4 1748
2a91525c 1749unsigned int sock_no_poll(struct file *file, struct socket *sock, poll_table *pt)
1da177e4
LT		 1750{
1751 return 0;
1752}
2a91525c 1753EXPORT_SYMBOL(sock_no_poll);
1da177e4
LT		 1754
1755int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1756{
1757 return -EOPNOTSUPP;
1758}
2a91525c 1759EXPORT_SYMBOL(sock_no_ioctl);
1da177e4
LT		 1760
1761int sock_no_listen(struct socket *sock, int backlog)
1762{
1763 return -EOPNOTSUPP;
1764}
2a91525c 1765EXPORT_SYMBOL(sock_no_listen);
1da177e4
LT		 1766
1767int sock_no_shutdown(struct socket *sock, int how)
1768{
1769 return -EOPNOTSUPP;
1770}
2a91525c 1771EXPORT_SYMBOL(sock_no_shutdown);
1da177e4
LT		 1772
1773int sock_no_setsockopt(struct socket *sock, int level, int optname,
b7058842 1774 char __user *optval, unsigned int optlen)
1da177e4
LT		 1775{
1776 return -EOPNOTSUPP;
1777}
2a91525c 1778EXPORT_SYMBOL(sock_no_setsockopt);
1da177e4
LT		 1779
1780int sock_no_getsockopt(struct socket *sock, int level, int optname,
1781 char __user *optval, int __user *optlen)
1782{
1783 return -EOPNOTSUPP;
1784}
2a91525c 1785EXPORT_SYMBOL(sock_no_getsockopt);
1da177e4
LT		 1786
1787int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
1788 size_t len)
1789{
1790 return -EOPNOTSUPP;
1791}
2a91525c 1792EXPORT_SYMBOL(sock_no_sendmsg);
1da177e4
LT		 1793
1794int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
1795 size_t len, int flags)
1796{
1797 return -EOPNOTSUPP;
1798}
2a91525c 1799EXPORT_SYMBOL(sock_no_recvmsg);
1da177e4
LT		 1800
1801int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
1802{
1803 /* Mirror missing mmap method error code */
1804 return -ENODEV;
1805}
2a91525c 1806EXPORT_SYMBOL(sock_no_mmap);
1da177e4
LT		 1807
1808ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
1809{
1810 ssize_t res;
1811 struct msghdr msg = {.msg_flags = flags};
1812 struct kvec iov;
1813 char *kaddr = kmap(page);
1814 iov.iov_base = kaddr + offset;
1815 iov.iov_len = size;
1816 res = kernel_sendmsg(sock, &msg, &iov, 1, size);
1817 kunmap(page);
1818 return res;
1819}
2a91525c 1820EXPORT_SYMBOL(sock_no_sendpage);
1da177e4
LT		 1821
1822/*
1823 * Default Socket Callbacks
1824 */
1825
1826static void sock_def_wakeup(struct sock *sk)
1827{
43815482
ED		 1828 struct socket_wq *wq;
1829
1830 rcu_read_lock();
1831 wq = rcu_dereference(sk->sk_wq);
1832 if (wq_has_sleeper(wq))
1833 wake_up_interruptible_all(&wq->wait);
1834 rcu_read_unlock();
1da177e4
LT		 1835}
1836
1837static void sock_def_error_report(struct sock *sk)
1838{
43815482
ED		 1839 struct socket_wq *wq;
1840
1841 rcu_read_lock();
1842 wq = rcu_dereference(sk->sk_wq);
1843 if (wq_has_sleeper(wq))
1844 wake_up_interruptible_poll(&wq->wait, POLLERR);
8d8ad9d7 1845 sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR);
43815482 1846 rcu_read_unlock();
1da177e4
LT		 1847}
1848
1849static void sock_def_readable(struct sock *sk, int len)
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_sync_poll(&wq->wait, POLLIN |
37e5540b 1857 POLLRDNORM | POLLRDBAND);
8d8ad9d7 1858 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
43815482 1859 rcu_read_unlock();
1da177e4
LT		 1860}
1861
1862static void sock_def_write_space(struct sock *sk)
1863{
43815482
ED		 1864 struct socket_wq *wq;
1865
1866 rcu_read_lock();
1da177e4
LT		 1867
1868 /* Do not wake up a writer until he can make "significant"
1869 * progress. --DaveM
1870 */
e71a4783 1871 if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) {
43815482
ED		 1872 wq = rcu_dereference(sk->sk_wq);
1873 if (wq_has_sleeper(wq))
1874 wake_up_interruptible_sync_poll(&wq->wait, POLLOUT |
37e5540b 1875 POLLWRNORM | POLLWRBAND);
1da177e4
LT		 1876
1877 /* Should agree with poll, otherwise some programs break */
1878 if (sock_writeable(sk))
8d8ad9d7 1879 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
1da177e4
LT		 1880 }
1881
43815482 1882 rcu_read_unlock();
1da177e4
LT		 1883}
1884
1885static void sock_def_destruct(struct sock *sk)
1886{
a51482bd 1887 kfree(sk->sk_protinfo);
1da177e4
LT		 1888}
1889
1890void sk_send_sigurg(struct sock *sk)
1891{
1892 if (sk->sk_socket && sk->sk_socket->file)
1893 if (send_sigurg(&sk->sk_socket->file->f_owner))
8d8ad9d7 1894 sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI);
1da177e4 1895}
2a91525c 1896EXPORT_SYMBOL(sk_send_sigurg);
1da177e4
LT		 1897
1898void sk_reset_timer(struct sock *sk, struct timer_list* timer,
1899 unsigned long expires)
1900{
1901 if (!mod_timer(timer, expires))
1902 sock_hold(sk);
1903}
1da177e4
LT		 1904EXPORT_SYMBOL(sk_reset_timer);
1905
1906void sk_stop_timer(struct sock *sk, struct timer_list* timer)
1907{
1908 if (timer_pending(timer) && del_timer(timer))
1909 __sock_put(sk);
1910}
1da177e4
LT		 1911EXPORT_SYMBOL(sk_stop_timer);
1912
1913void sock_init_data(struct socket *sock, struct sock *sk)
1914{
1915 skb_queue_head_init(&sk->sk_receive_queue);
1916 skb_queue_head_init(&sk->sk_write_queue);
1917 skb_queue_head_init(&sk->sk_error_queue);
97fc2f08
CL		 1918#ifdef CONFIG_NET_DMA
1919 skb_queue_head_init(&sk->sk_async_wait_queue);
1920#endif
1da177e4
LT		 1921
1922 sk->sk_send_head = NULL;
1923
1924 init_timer(&sk->sk_timer);
4ec93edb 1925
1da177e4
LT		 1926 sk->sk_allocation = GFP_KERNEL;
1927 sk->sk_rcvbuf = sysctl_rmem_default;
1928 sk->sk_sndbuf = sysctl_wmem_default;
1929 sk->sk_state = TCP_CLOSE;
972692e0 1930 sk_set_socket(sk, sock);
1da177e4
LT		 1931
1932 sock_set_flag(sk, SOCK_ZAPPED);
1933
e71a4783 1934 if (sock) {
1da177e4 1935 sk->sk_type = sock->type;
43815482 1936 sk->sk_wq = sock->wq;
1da177e4
LT		 1937 sock->sk = sk;
1938 } else
43815482 1939 sk->sk_wq = NULL;
1da177e4 1940
b6c6712a 1941 spin_lock_init(&sk->sk_dst_lock);
1da177e4 1942 rwlock_init(&sk->sk_callback_lock);
443aef0e
PZ		 1943 lockdep_set_class_and_name(&sk->sk_callback_lock,
1944 af_callback_keys + sk->sk_family,
1945 af_family_clock_key_strings[sk->sk_family]);
1da177e4
LT		 1946
1947 sk->sk_state_change = sock_def_wakeup;
1948 sk->sk_data_ready = sock_def_readable;
1949 sk->sk_write_space = sock_def_write_space;
1950 sk->sk_error_report = sock_def_error_report;
1951 sk->sk_destruct = sock_def_destruct;
1952
1953 sk->sk_sndmsg_page = NULL;
1954 sk->sk_sndmsg_off = 0;
1955
1956 sk->sk_peercred.pid = 0;
1957 sk->sk_peercred.uid = -1;
1958 sk->sk_peercred.gid = -1;
1959 sk->sk_write_pending = 0;
1960 sk->sk_rcvlowat = 1;
1961 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
1962 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
1963
f37f0afb 1964 sk->sk_stamp = ktime_set(-1L, 0);
1da177e4 1965
4dc6dc71
ED		 1966 /*
1967 * Before updating sk_refcnt, we must commit prior changes to memory
1968 * (Documentation/RCU/rculist_nulls.txt for details)
1969 */
1970 smp_wmb();
1da177e4 1971 atomic_set(&sk->sk_refcnt, 1);
33c732c3 1972 atomic_set(&sk->sk_drops, 0);
1da177e4 1973}
2a91525c 1974EXPORT_SYMBOL(sock_init_data);
1da177e4 1975
b5606c2d 1976void lock_sock_nested(struct sock *sk, int subclass)
1da177e4
LT		 1977{
1978 might_sleep();
a5b5bb9a 1979 spin_lock_bh(&sk->sk_lock.slock);
d2e9117c 1980 if (sk->sk_lock.owned)
1da177e4 1981 __lock_sock(sk);
d2e9117c 1982 sk->sk_lock.owned = 1;
a5b5bb9a
IM		 1983 spin_unlock(&sk->sk_lock.slock);
1984 /*
1985 * The sk_lock has mutex_lock() semantics here:
1986 */
fcc70d5f 1987 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
a5b5bb9a 1988 local_bh_enable();
1da177e4 1989}
fcc70d5f 1990EXPORT_SYMBOL(lock_sock_nested);
1da177e4 1991
b5606c2d 1992void release_sock(struct sock *sk)
1da177e4 1993{
a5b5bb9a
IM		 1994 /*
1995 * The sk_lock has mutex_unlock() semantics:
1996 */
1997 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
1998
1999 spin_lock_bh(&sk->sk_lock.slock);
1da177e4
LT		 2000 if (sk->sk_backlog.tail)
2001 __release_sock(sk);
d2e9117c 2002 sk->sk_lock.owned = 0;
a5b5bb9a
IM		 2003 if (waitqueue_active(&sk->sk_lock.wq))
2004 wake_up(&sk->sk_lock.wq);
2005 spin_unlock_bh(&sk->sk_lock.slock);
1da177e4
LT		 2006}
2007EXPORT_SYMBOL(release_sock);
2008
2009int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
4ec93edb 2010{
b7aa0bf7 2011 struct timeval tv;
1da177e4 2012 if (!sock_flag(sk, SOCK_TIMESTAMP))
20d49473 2013 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
b7aa0bf7
ED		 2014 tv = ktime_to_timeval(sk->sk_stamp);
2015 if (tv.tv_sec == -1)
1da177e4 2016 return -ENOENT;
b7aa0bf7
ED		 2017 if (tv.tv_sec == 0) {
2018 sk->sk_stamp = ktime_get_real();
2019 tv = ktime_to_timeval(sk->sk_stamp);
2020 }
2021 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0;
4ec93edb 2022}
1da177e4
LT		 2023EXPORT_SYMBOL(sock_get_timestamp);
2024
ae40eb1e
ED		 2025int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
2026{
2027 struct timespec ts;
2028 if (!sock_flag(sk, SOCK_TIMESTAMP))
20d49473 2029 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
ae40eb1e
ED		 2030 ts = ktime_to_timespec(sk->sk_stamp);
2031 if (ts.tv_sec == -1)
2032 return -ENOENT;
2033 if (ts.tv_sec == 0) {
2034 sk->sk_stamp = ktime_get_real();
2035 ts = ktime_to_timespec(sk->sk_stamp);
2036 }
2037 return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0;
2038}
2039EXPORT_SYMBOL(sock_get_timestampns);
2040
20d49473 2041void sock_enable_timestamp(struct sock *sk, int flag)
4ec93edb 2042{
20d49473
PO		 2043 if (!sock_flag(sk, flag)) {
2044 sock_set_flag(sk, flag);
2045 /*
2046 * we just set one of the two flags which require net
2047 * time stamping, but time stamping might have been on
2048 * already because of the other one
2049 */
2050 if (!sock_flag(sk,
2051 flag == SOCK_TIMESTAMP ?
2052 SOCK_TIMESTAMPING_RX_SOFTWARE :
2053 SOCK_TIMESTAMP))
2054 net_enable_timestamp();
1da177e4
LT		 2055 }
2056}
1da177e4
LT		 2057
2058/*
2059 * Get a socket option on an socket.
2060 *
2061 * FIX: POSIX 1003.1g is very ambiguous here. It states that
2062 * asynchronous errors should be reported by getsockopt. We assume
2063 * this means if you specify SO_ERROR (otherwise whats the point of it).
2064 */
2065int sock_common_getsockopt(struct socket *sock, int level, int optname,
2066 char __user *optval, int __user *optlen)
2067{
2068 struct sock *sk = sock->sk;
2069
2070 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2071}
1da177e4
LT		 2072EXPORT_SYMBOL(sock_common_getsockopt);
2073
3fdadf7d 2074#ifdef CONFIG_COMPAT
543d9cfe
ACM		 2075int compat_sock_common_getsockopt(struct socket *sock, int level, int optname,
2076 char __user *optval, int __user *optlen)
3fdadf7d
DM		 2077{
2078 struct sock *sk = sock->sk;
2079
1e51f951 2080 if (sk->sk_prot->compat_getsockopt != NULL)
543d9cfe
ACM		 2081 return sk->sk_prot->compat_getsockopt(sk, level, optname,
2082 optval, optlen);
3fdadf7d
DM		 2083 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2084}
2085EXPORT_SYMBOL(compat_sock_common_getsockopt);
2086#endif
2087
1da177e4
LT		 2088int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock,
2089 struct msghdr *msg, size_t size, int flags)
2090{
2091 struct sock *sk = sock->sk;
2092 int addr_len = 0;
2093 int err;
2094
2095 err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT,
2096 flags & ~MSG_DONTWAIT, &addr_len);
2097 if (err >= 0)
2098 msg->msg_namelen = addr_len;
2099 return err;
2100}
1da177e4
LT		 2101EXPORT_SYMBOL(sock_common_recvmsg);
2102
2103/*
2104 * Set socket options on an inet socket.
2105 */
2106int sock_common_setsockopt(struct socket *sock, int level, int optname,
b7058842 2107 char __user *optval, unsigned int optlen)
1da177e4
LT		 2108{
2109 struct sock *sk = sock->sk;
2110
2111 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2112}
1da177e4
LT		 2113EXPORT_SYMBOL(sock_common_setsockopt);
2114
3fdadf7d 2115#ifdef CONFIG_COMPAT
543d9cfe 2116int compat_sock_common_setsockopt(struct socket *sock, int level, int optname,
b7058842 2117 char __user *optval, unsigned int optlen)
3fdadf7d
DM		 2118{
2119 struct sock *sk = sock->sk;
2120
543d9cfe
ACM		 2121 if (sk->sk_prot->compat_setsockopt != NULL)
2122 return sk->sk_prot->compat_setsockopt(sk, level, optname,
2123 optval, optlen);
3fdadf7d
DM		 2124 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2125}
2126EXPORT_SYMBOL(compat_sock_common_setsockopt);
2127#endif
2128
1da177e4
LT		 2129void sk_common_release(struct sock *sk)
2130{
2131 if (sk->sk_prot->destroy)
2132 sk->sk_prot->destroy(sk);
2133
2134 /*
2135 * Observation: when sock_common_release is called, processes have
2136 * no access to socket. But net still has.
2137 * Step one, detach it from networking:
2138 *
2139 * A. Remove from hash tables.
2140 */
2141
2142 sk->sk_prot->unhash(sk);
2143
2144 /*
2145 * In this point socket cannot receive new packets, but it is possible
2146 * that some packets are in flight because some CPU runs receiver and
2147 * did hash table lookup before we unhashed socket. They will achieve
2148 * receive queue and will be purged by socket destructor.
2149 *
2150 * Also we still have packets pending on receive queue and probably,
2151 * our own packets waiting in device queues. sock_destroy will drain
2152 * receive queue, but transmitted packets will delay socket destruction
2153 * until the last reference will be released.
2154 */
2155
2156 sock_orphan(sk);
2157
2158 xfrm_sk_free_policy(sk);
2159
e6848976 2160 sk_refcnt_debug_release(sk);
1da177e4
LT		 2161 sock_put(sk);
2162}
1da177e4
LT		 2163EXPORT_SYMBOL(sk_common_release);
2164
2165static DEFINE_RWLOCK(proto_list_lock);
2166static LIST_HEAD(proto_list);
2167
13ff3d6f
PE		 2168#ifdef CONFIG_PROC_FS
2169#define PROTO_INUSE_NR 64 /* should be enough for the first time */
1338d466
PE		 2170struct prot_inuse {
2171 int val[PROTO_INUSE_NR];
2172};
13ff3d6f
PE		 2173
2174static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR);
70ee1159
PE		 2175
2176#ifdef CONFIG_NET_NS
2177void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
2178{
2179 int cpu = smp_processor_id();
2180 per_cpu_ptr(net->core.inuse, cpu)->val[prot->inuse_idx] += val;
2181}
2182EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2183
2184int sock_prot_inuse_get(struct net *net, struct proto *prot)
2185{
2186 int cpu, idx = prot->inuse_idx;
2187 int res = 0;
2188
2189 for_each_possible_cpu(cpu)
2190 res += per_cpu_ptr(net->core.inuse, cpu)->val[idx];
2191
2192 return res >= 0 ? res : 0;
2193}
2194EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
2195
2c8c1e72 2196static int __net_init sock_inuse_init_net(struct net *net)
70ee1159
PE		 2197{
2198 net->core.inuse = alloc_percpu(struct prot_inuse);
2199 return net->core.inuse ? 0 : -ENOMEM;
2200}
2201
2c8c1e72 2202static void __net_exit sock_inuse_exit_net(struct net *net)
70ee1159
PE		 2203{
2204 free_percpu(net->core.inuse);
2205}
2206
2207static struct pernet_operations net_inuse_ops = {
2208 .init = sock_inuse_init_net,
2209 .exit = sock_inuse_exit_net,
2210};
2211
2212static __init int net_inuse_init(void)
2213{
2214 if (register_pernet_subsys(&net_inuse_ops))
2215 panic("Cannot initialize net inuse counters");
2216
2217 return 0;
2218}
2219
2220core_initcall(net_inuse_init);
2221#else
1338d466
PE		 2222static DEFINE_PER_CPU(struct prot_inuse, prot_inuse);
2223
c29a0bc4 2224void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
1338d466
PE		 2225{
2226 __get_cpu_var(prot_inuse).val[prot->inuse_idx] += val;
2227}
2228EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2229
c29a0bc4 2230int sock_prot_inuse_get(struct net *net, struct proto *prot)
1338d466
PE		 2231{
2232 int cpu, idx = prot->inuse_idx;
2233 int res = 0;
2234
2235 for_each_possible_cpu(cpu)
2236 res += per_cpu(prot_inuse, cpu).val[idx];
2237
2238 return res >= 0 ? res : 0;
2239}
2240EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
70ee1159 2241#endif
13ff3d6f
PE		 2242
2243static void assign_proto_idx(struct proto *prot)
2244{
2245 prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR);
2246
2247 if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) {
2248 printk(KERN_ERR "PROTO_INUSE_NR exhausted\n");
2249 return;
2250 }
2251
2252 set_bit(prot->inuse_idx, proto_inuse_idx);
2253}
2254
2255static void release_proto_idx(struct proto *prot)
2256{
2257 if (prot->inuse_idx != PROTO_INUSE_NR - 1)
2258 clear_bit(prot->inuse_idx, proto_inuse_idx);
2259}
2260#else
2261static inline void assign_proto_idx(struct proto *prot)
2262{
2263}
2264
2265static inline void release_proto_idx(struct proto *prot)
2266{
2267}
2268#endif
2269
b733c007
PE		 2270int proto_register(struct proto *prot, int alloc_slab)
2271{
1da177e4
LT		 2272 if (alloc_slab) {
2273 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0,
271b72c7
ED		 2274 SLAB_HWCACHE_ALIGN | prot->slab_flags,
2275 NULL);
1da177e4
LT		 2276
2277 if (prot->slab == NULL) {
2278 printk(KERN_CRIT "%s: Can't create sock SLAB cache!\n",
2279 prot->name);
60e7663d 2280 goto out;
1da177e4 2281 }
2e6599cb
ACM		 2282
2283 if (prot->rsk_prot != NULL) {
faf23422 2284 prot->rsk_prot->slab_name = kasprintf(GFP_KERNEL, "request_sock_%s", prot->name);
7e56b5d6 2285 if (prot->rsk_prot->slab_name == NULL)
2e6599cb
ACM		 2286 goto out_free_sock_slab;
2287
7e56b5d6 2288 prot->rsk_prot->slab = kmem_cache_create(prot->rsk_prot->slab_name,
2e6599cb 2289 prot->rsk_prot->obj_size, 0,
20c2df83 2290 SLAB_HWCACHE_ALIGN, NULL);
2e6599cb
ACM		 2291
2292 if (prot->rsk_prot->slab == NULL) {
2293 printk(KERN_CRIT "%s: Can't create request sock SLAB cache!\n",
2294 prot->name);
2295 goto out_free_request_sock_slab_name;
2296 }
2297 }
8feaf0c0 2298
6d6ee43e 2299 if (prot->twsk_prot != NULL) {
faf23422 2300 prot->twsk_prot->twsk_slab_name = kasprintf(GFP_KERNEL, "tw_sock_%s", prot->name);
8feaf0c0 2301
7e56b5d6 2302 if (prot->twsk_prot->twsk_slab_name == NULL)
8feaf0c0
ACM		 2303 goto out_free_request_sock_slab;
2304
6d6ee43e 2305 prot->twsk_prot->twsk_slab =
7e56b5d6 2306 kmem_cache_create(prot->twsk_prot->twsk_slab_name,
6d6ee43e 2307 prot->twsk_prot->twsk_obj_size,
3ab5aee7
ED		 2308 0,
2309 SLAB_HWCACHE_ALIGN |
2310 prot->slab_flags,
20c2df83 2311 NULL);
6d6ee43e 2312 if (prot->twsk_prot->twsk_slab == NULL)
8feaf0c0
ACM		 2313 goto out_free_timewait_sock_slab_name;
2314 }
1da177e4
LT		 2315 }
2316
2a278051 2317 write_lock(&proto_list_lock);
1da177e4 2318 list_add(&prot->node, &proto_list);
13ff3d6f 2319 assign_proto_idx(prot);
1da177e4 2320 write_unlock(&proto_list_lock);
b733c007
PE		 2321 return 0;
2322
8feaf0c0 2323out_free_timewait_sock_slab_name:
7e56b5d6 2324 kfree(prot->twsk_prot->twsk_slab_name);
8feaf0c0
ACM		 2325out_free_request_sock_slab:
2326 if (prot->rsk_prot && prot->rsk_prot->slab) {
2327 kmem_cache_destroy(prot->rsk_prot->slab);
2328 prot->rsk_prot->slab = NULL;
2329 }
2e6599cb 2330out_free_request_sock_slab_name:
72150e9b
DC		 2331 if (prot->rsk_prot)
2332 kfree(prot->rsk_prot->slab_name);
2e6599cb
ACM		 2333out_free_sock_slab:
2334 kmem_cache_destroy(prot->slab);
2335 prot->slab = NULL;
b733c007
PE		 2336out:
2337 return -ENOBUFS;
1da177e4 2338}
1da177e4
LT		 2339EXPORT_SYMBOL(proto_register);
2340
2341void proto_unregister(struct proto *prot)
2342{
2343 write_lock(&proto_list_lock);
13ff3d6f 2344 release_proto_idx(prot);
0a3f4358
PM		 2345 list_del(&prot->node);
2346 write_unlock(&proto_list_lock);
1da177e4
LT		 2347
2348 if (prot->slab != NULL) {
2349 kmem_cache_destroy(prot->slab);
2350 prot->slab = NULL;
2351 }
2352
2e6599cb 2353 if (prot->rsk_prot != NULL && prot->rsk_prot->slab != NULL) {
2e6599cb 2354 kmem_cache_destroy(prot->rsk_prot->slab);
7e56b5d6 2355 kfree(prot->rsk_prot->slab_name);
2e6599cb
ACM		 2356 prot->rsk_prot->slab = NULL;
2357 }
2358
6d6ee43e 2359 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) {
6d6ee43e 2360 kmem_cache_destroy(prot->twsk_prot->twsk_slab);
7e56b5d6 2361 kfree(prot->twsk_prot->twsk_slab_name);
6d6ee43e 2362 prot->twsk_prot->twsk_slab = NULL;
8feaf0c0 2363 }
1da177e4 2364}
1da177e4
LT		 2365EXPORT_SYMBOL(proto_unregister);
2366
2367#ifdef CONFIG_PROC_FS
1da177e4 2368static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
9a429c49 2369 __acquires(proto_list_lock)
1da177e4
LT		 2370{
2371 read_lock(&proto_list_lock);
60f0438a 2372 return seq_list_start_head(&proto_list, *pos);
1da177e4
LT		 2373}
2374
2375static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2376{
60f0438a 2377 return seq_list_next(v, &proto_list, pos);
1da177e4
LT		 2378}
2379
2380static void proto_seq_stop(struct seq_file *seq, void *v)
9a429c49 2381 __releases(proto_list_lock)
1da177e4
LT		 2382{
2383 read_unlock(&proto_list_lock);
2384}
2385
2386static char proto_method_implemented(const void *method)
2387{
2388 return method == NULL ? 'n' : 'y';
2389}
2390
2391static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
2392{
2393 seq_printf(seq, "%-9s %4u %6d %6d %-3s %6u %-3s %-10s "
2394 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
2395 proto->name,
2396 proto->obj_size,
14e943db 2397 sock_prot_inuse_get(seq_file_net(seq), proto),
1da177e4
LT		 2398 proto->memory_allocated != NULL ? atomic_read(proto->memory_allocated) : -1,
2399 proto->memory_pressure != NULL ? *proto->memory_pressure ? "yes" : "no" : "NI",
2400 proto->max_header,
2401 proto->slab == NULL ? "no" : "yes",
2402 module_name(proto->owner),
2403 proto_method_implemented(proto->close),
2404 proto_method_implemented(proto->connect),
2405 proto_method_implemented(proto->disconnect),
2406 proto_method_implemented(proto->accept),
2407 proto_method_implemented(proto->ioctl),
2408 proto_method_implemented(proto->init),
2409 proto_method_implemented(proto->destroy),
2410 proto_method_implemented(proto->shutdown),
2411 proto_method_implemented(proto->setsockopt),
2412 proto_method_implemented(proto->getsockopt),
2413 proto_method_implemented(proto->sendmsg),
2414 proto_method_implemented(proto->recvmsg),
2415 proto_method_implemented(proto->sendpage),
2416 proto_method_implemented(proto->bind),
2417 proto_method_implemented(proto->backlog_rcv),
2418 proto_method_implemented(proto->hash),
2419 proto_method_implemented(proto->unhash),
2420 proto_method_implemented(proto->get_port),
2421 proto_method_implemented(proto->enter_memory_pressure));
2422}
2423
2424static int proto_seq_show(struct seq_file *seq, void *v)
2425{
60f0438a 2426 if (v == &proto_list)
1da177e4
LT		 2427 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
2428 "protocol",
2429 "size",
2430 "sockets",
2431 "memory",
2432 "press",
2433 "maxhdr",
2434 "slab",
2435 "module",
2436 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
2437 else
60f0438a 2438 proto_seq_printf(seq, list_entry(v, struct proto, node));
1da177e4
LT		 2439 return 0;
2440}
2441
f690808e 2442static const struct seq_operations proto_seq_ops = {
1da177e4
LT		 2443 .start = proto_seq_start,
2444 .next = proto_seq_next,
2445 .stop = proto_seq_stop,
2446 .show = proto_seq_show,
2447};
2448
2449static int proto_seq_open(struct inode *inode, struct file *file)
2450{
14e943db
ED		 2451 return seq_open_net(inode, file, &proto_seq_ops,
2452 sizeof(struct seq_net_private));
1da177e4
LT		 2453}
2454
9a32144e 2455static const struct file_operations proto_seq_fops = {
1da177e4
LT		 2456 .owner = THIS_MODULE,
2457 .open = proto_seq_open,
2458 .read = seq_read,
2459 .llseek = seq_lseek,
14e943db
ED		 2460 .release = seq_release_net,
2461};
2462
2463static __net_init int proto_init_net(struct net *net)
2464{
2465 if (!proc_net_fops_create(net, "protocols", S_IRUGO, &proto_seq_fops))
2466 return -ENOMEM;
2467
2468 return 0;
2469}
2470
2471static __net_exit void proto_exit_net(struct net *net)
2472{
2473 proc_net_remove(net, "protocols");
2474}
2475
2476
2477static __net_initdata struct pernet_operations proto_net_ops = {
2478 .init = proto_init_net,
2479 .exit = proto_exit_net,
1da177e4
LT		 2480};
2481
2482static int __init proto_init(void)
2483{
14e943db 2484 return register_pernet_subsys(&proto_net_ops);
1da177e4
LT		 2485}
2486
2487subsys_initcall(proto_init);
2488
2489#endif /* PROC_FS */
Clone of davem's net-next-2.6 tree