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user_ns: Introduce user_nsmap_uid and user_ns_map_gid.
[linux.git] / net / core / sock.c
CommitLineData
1da177e4
LT		 1/*
2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
5 *
6 * Generic socket support routines. Memory allocators, socket lock/release
7 * handler for protocols to use and generic option handler.
8 *
9 *
02c30a84 10 * Authors: Ross Biro
1da177e4
LT		 11 * Fred N. van Kempen, <[email protected]>
12 * Florian La Roche, <[email protected]>
13 * Alan Cox, <[email protected]>
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" ,
fe33147a 159 "sk_lock-AF_IEEE802154", "sk_lock-AF_CAIF" ,
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" ,
fe33147a 175 "slock-AF_IEEE802154", "slock-AF_CAIF" ,
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" ,
fe33147a 191 "clock-AF_IEEE802154", "clock-AF_CAIF" ,
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}
82862742 1067EXPORT_SYMBOL(sock_update_classid);
f8451725
HX		 1068#endif
1069
1da177e4
LT		 1070/**
1071 * sk_alloc - All socket objects are allocated here
c4ea43c5 1072 * @net: the applicable net namespace
4dc3b16b
PP		 1073 * @family: protocol family
1074 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1075 * @prot: struct proto associated with this new sock instance
1da177e4 1076 */
1b8d7ae4 1077struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
6257ff21 1078 struct proto *prot)
1da177e4 1079{
c308c1b2 1080 struct sock *sk;
1da177e4 1081
154adbc8 1082 sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family);
1da177e4 1083 if (sk) {
154adbc8
PE		 1084 sk->sk_family = family;
1085 /*
1086 * See comment in struct sock definition to understand
1087 * why we need sk_prot_creator -acme
1088 */
1089 sk->sk_prot = sk->sk_prot_creator = prot;
1090 sock_lock_init(sk);
3b1e0a65 1091 sock_net_set(sk, get_net(net));
d66ee058 1092 atomic_set(&sk->sk_wmem_alloc, 1);
f8451725
HX		 1093
1094 sock_update_classid(sk);
1da177e4 1095 }
a79af59e 1096
2e4afe7b 1097 return sk;
1da177e4 1098}
2a91525c 1099EXPORT_SYMBOL(sk_alloc);
1da177e4 1100
2b85a34e 1101static void __sk_free(struct sock *sk)
1da177e4
LT		 1102{
1103 struct sk_filter *filter;
1da177e4
LT		 1104
1105 if (sk->sk_destruct)
1106 sk->sk_destruct(sk);
1107
a898def2
PM		 1108 filter = rcu_dereference_check(sk->sk_filter,
1109 atomic_read(&sk->sk_wmem_alloc) == 0);
1da177e4 1110 if (filter) {
309dd5fc 1111 sk_filter_uncharge(sk, filter);
fda9ef5d 1112 rcu_assign_pointer(sk->sk_filter, NULL);
1da177e4
LT		 1113 }
1114
20d49473
PO		 1115 sock_disable_timestamp(sk, SOCK_TIMESTAMP);
1116 sock_disable_timestamp(sk, SOCK_TIMESTAMPING_RX_SOFTWARE);
1da177e4
LT		 1117
1118 if (atomic_read(&sk->sk_omem_alloc))
1119 printk(KERN_DEBUG "%s: optmem leakage (%d bytes) detected.\n",
0dc47877 1120 __func__, atomic_read(&sk->sk_omem_alloc));
1da177e4 1121
3b1e0a65 1122 put_net(sock_net(sk));
c308c1b2 1123 sk_prot_free(sk->sk_prot_creator, sk);
1da177e4 1124}
2b85a34e
ED		 1125
1126void sk_free(struct sock *sk)
1127{
1128 /*
1129 * We substract one from sk_wmem_alloc and can know if
1130 * some packets are still in some tx queue.
1131 * If not null, sock_wfree() will call __sk_free(sk) later
1132 */
1133 if (atomic_dec_and_test(&sk->sk_wmem_alloc))
1134 __sk_free(sk);
1135}
2a91525c 1136EXPORT_SYMBOL(sk_free);
1da177e4 1137
edf02087
DL		 1138/*
1139 * Last sock_put should drop referrence to sk->sk_net. It has already
1140 * been dropped in sk_change_net. Taking referrence to stopping namespace
1141 * is not an option.
1142 * Take referrence to a socket to remove it from hash _alive_ and after that
1143 * destroy it in the context of init_net.
1144 */
1145void sk_release_kernel(struct sock *sk)
1146{
1147 if (sk == NULL || sk->sk_socket == NULL)
1148 return;
1149
1150 sock_hold(sk);
1151 sock_release(sk->sk_socket);
65a18ec5 1152 release_net(sock_net(sk));
3b1e0a65 1153 sock_net_set(sk, get_net(&init_net));
edf02087
DL		 1154 sock_put(sk);
1155}
45af1754 1156EXPORT_SYMBOL(sk_release_kernel);
edf02087 1157
dd0fc66f 1158struct sock *sk_clone(const struct sock *sk, const gfp_t priority)
87d11ceb 1159{
8fd1d178 1160 struct sock *newsk;
87d11ceb 1161
8fd1d178 1162 newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family);
87d11ceb
ACM		 1163 if (newsk != NULL) {
1164 struct sk_filter *filter;
1165
892c141e 1166 sock_copy(newsk, sk);
87d11ceb
ACM		 1167
1168 /* SANITY */
3b1e0a65 1169 get_net(sock_net(newsk));
87d11ceb
ACM		 1170 sk_node_init(&newsk->sk_node);
1171 sock_lock_init(newsk);
1172 bh_lock_sock(newsk);
fa438ccf 1173 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL;
8eae939f 1174 newsk->sk_backlog.len = 0;
87d11ceb
ACM		 1175
1176 atomic_set(&newsk->sk_rmem_alloc, 0);
2b85a34e
ED		 1177 /*
1178 * sk_wmem_alloc set to one (see sk_free() and sock_wfree())
1179 */
1180 atomic_set(&newsk->sk_wmem_alloc, 1);
87d11ceb
ACM		 1181 atomic_set(&newsk->sk_omem_alloc, 0);
1182 skb_queue_head_init(&newsk->sk_receive_queue);
1183 skb_queue_head_init(&newsk->sk_write_queue);
97fc2f08
CL		 1184#ifdef CONFIG_NET_DMA
1185 skb_queue_head_init(&newsk->sk_async_wait_queue);
1186#endif
87d11ceb 1187
b6c6712a 1188 spin_lock_init(&newsk->sk_dst_lock);
87d11ceb 1189 rwlock_init(&newsk->sk_callback_lock);
443aef0e
PZ		 1190 lockdep_set_class_and_name(&newsk->sk_callback_lock,
1191 af_callback_keys + newsk->sk_family,
1192 af_family_clock_key_strings[newsk->sk_family]);
87d11ceb
ACM		 1193
1194 newsk->sk_dst_cache = NULL;
1195 newsk->sk_wmem_queued = 0;
1196 newsk->sk_forward_alloc = 0;
1197 newsk->sk_send_head = NULL;
87d11ceb
ACM		 1198 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
1199
1200 sock_reset_flag(newsk, SOCK_DONE);
1201 skb_queue_head_init(&newsk->sk_error_queue);
1202
1203 filter = newsk->sk_filter;
1204 if (filter != NULL)
1205 sk_filter_charge(newsk, filter);
1206
1207 if (unlikely(xfrm_sk_clone_policy(newsk))) {
1208 /* It is still raw copy of parent, so invalidate
1209 * destructor and make plain sk_free() */
1210 newsk->sk_destruct = NULL;
1211 sk_free(newsk);
1212 newsk = NULL;
1213 goto out;
1214 }
1215
1216 newsk->sk_err = 0;
1217 newsk->sk_priority = 0;
4dc6dc71
ED		 1218 /*
1219 * Before updating sk_refcnt, we must commit prior changes to memory
1220 * (Documentation/RCU/rculist_nulls.txt for details)
1221 */
1222 smp_wmb();
87d11ceb
ACM		 1223 atomic_set(&newsk->sk_refcnt, 2);
1224
1225 /*
1226 * Increment the counter in the same struct proto as the master
1227 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
1228 * is the same as sk->sk_prot->socks, as this field was copied
1229 * with memcpy).
1230 *
1231 * This _changes_ the previous behaviour, where
1232 * tcp_create_openreq_child always was incrementing the
1233 * equivalent to tcp_prot->socks (inet_sock_nr), so this have
1234 * to be taken into account in all callers. -acme
1235 */
1236 sk_refcnt_debug_inc(newsk);
972692e0 1237 sk_set_socket(newsk, NULL);
43815482 1238 newsk->sk_wq = NULL;
87d11ceb
ACM		 1239
1240 if (newsk->sk_prot->sockets_allocated)
1748376b 1241 percpu_counter_inc(newsk->sk_prot->sockets_allocated);
704da560
OP		 1242
1243 if (sock_flag(newsk, SOCK_TIMESTAMP) ||
1244 sock_flag(newsk, SOCK_TIMESTAMPING_RX_SOFTWARE))
1245 net_enable_timestamp();
87d11ceb
ACM		 1246 }
1247out:
1248 return newsk;
1249}
87d11ceb
ACM		 1250EXPORT_SYMBOL_GPL(sk_clone);
1251
9958089a
AK		 1252void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
1253{
1254 __sk_dst_set(sk, dst);
1255 sk->sk_route_caps = dst->dev->features;
1256 if (sk->sk_route_caps & NETIF_F_GSO)
4fcd6b99 1257 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE;
a465419b 1258 sk->sk_route_caps &= ~sk->sk_route_nocaps;
9958089a 1259 if (sk_can_gso(sk)) {
82cc1a7a 1260 if (dst->header_len) {
9958089a 1261 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
82cc1a7a 1262 } else {
9958089a 1263 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
82cc1a7a
PWJ		 1264 sk->sk_gso_max_size = dst->dev->gso_max_size;
1265 }
9958089a
AK		 1266 }
1267}
1268EXPORT_SYMBOL_GPL(sk_setup_caps);
1269
1da177e4
LT		 1270void __init sk_init(void)
1271{
4481374c 1272 if (totalram_pages <= 4096) {
1da177e4
LT		 1273 sysctl_wmem_max = 32767;
1274 sysctl_rmem_max = 32767;
1275 sysctl_wmem_default = 32767;
1276 sysctl_rmem_default = 32767;
4481374c 1277 } else if (totalram_pages >= 131072) {
1da177e4
LT		 1278 sysctl_wmem_max = 131071;
1279 sysctl_rmem_max = 131071;
1280 }
1281}
1282
1283/*
1284 * Simple resource managers for sockets.
1285 */
1286
1287
4ec93edb
YH		 1288/*
1289 * Write buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1290 */
1291void sock_wfree(struct sk_buff *skb)
1292{
1293 struct sock *sk = skb->sk;
d99927f4 1294 unsigned int len = skb->truesize;
1da177e4 1295
d99927f4
ED		 1296 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) {
1297 /*
1298 * Keep a reference on sk_wmem_alloc, this will be released
1299 * after sk_write_space() call
1300 */
1301 atomic_sub(len - 1, &sk->sk_wmem_alloc);
1da177e4 1302 sk->sk_write_space(sk);
d99927f4
ED		 1303 len = 1;
1304 }
2b85a34e 1305 /*
d99927f4
ED		 1306 * if sk_wmem_alloc reaches 0, we must finish what sk_free()
1307 * could not do because of in-flight packets
2b85a34e 1308 */
d99927f4 1309 if (atomic_sub_and_test(len, &sk->sk_wmem_alloc))
2b85a34e 1310 __sk_free(sk);
1da177e4 1311}
2a91525c 1312EXPORT_SYMBOL(sock_wfree);
1da177e4 1313
4ec93edb
YH		 1314/*
1315 * Read buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1316 */
1317void sock_rfree(struct sk_buff *skb)
1318{
1319 struct sock *sk = skb->sk;
1320
1321 atomic_sub(skb->truesize, &sk->sk_rmem_alloc);
3ab224be 1322 sk_mem_uncharge(skb->sk, skb->truesize);
1da177e4 1323}
2a91525c 1324EXPORT_SYMBOL(sock_rfree);
1da177e4
LT		 1325
1326
1327int sock_i_uid(struct sock *sk)
1328{
1329 int uid;
1330
1331 read_lock(&sk->sk_callback_lock);
1332 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : 0;
1333 read_unlock(&sk->sk_callback_lock);
1334 return uid;
1335}
2a91525c 1336EXPORT_SYMBOL(sock_i_uid);
1da177e4
LT		 1337
1338unsigned long sock_i_ino(struct sock *sk)
1339{
1340 unsigned long ino;
1341
1342 read_lock(&sk->sk_callback_lock);
1343 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
1344 read_unlock(&sk->sk_callback_lock);
1345 return ino;
1346}
2a91525c 1347EXPORT_SYMBOL(sock_i_ino);
1da177e4
LT		 1348
1349/*
1350 * Allocate a skb from the socket's send buffer.
1351 */
86a76caf 1352struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
dd0fc66f 1353 gfp_t priority)
1da177e4
LT		 1354{
1355 if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
2a91525c 1356 struct sk_buff *skb = alloc_skb(size, priority);
1da177e4
LT		 1357 if (skb) {
1358 skb_set_owner_w(skb, sk);
1359 return skb;
1360 }
1361 }
1362 return NULL;
1363}
2a91525c 1364EXPORT_SYMBOL(sock_wmalloc);
1da177e4
LT		 1365
1366/*
1367 * Allocate a skb from the socket's receive buffer.
4ec93edb 1368 */
86a76caf 1369struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force,
dd0fc66f 1370 gfp_t priority)
1da177e4
LT		 1371{
1372 if (force || atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) {
1373 struct sk_buff *skb = alloc_skb(size, priority);
1374 if (skb) {
1375 skb_set_owner_r(skb, sk);
1376 return skb;
1377 }
1378 }
1379 return NULL;
1380}
1381
4ec93edb 1382/*
1da177e4 1383 * Allocate a memory block from the socket's option memory buffer.
4ec93edb 1384 */
dd0fc66f 1385void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
1da177e4
LT		 1386{
1387 if ((unsigned)size <= sysctl_optmem_max &&
1388 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) {
1389 void *mem;
1390 /* First do the add, to avoid the race if kmalloc
4ec93edb 1391 * might sleep.
1da177e4
LT		 1392 */
1393 atomic_add(size, &sk->sk_omem_alloc);
1394 mem = kmalloc(size, priority);
1395 if (mem)
1396 return mem;
1397 atomic_sub(size, &sk->sk_omem_alloc);
1398 }
1399 return NULL;
1400}
2a91525c 1401EXPORT_SYMBOL(sock_kmalloc);
1da177e4
LT		 1402
1403/*
1404 * Free an option memory block.
1405 */
1406void sock_kfree_s(struct sock *sk, void *mem, int size)
1407{
1408 kfree(mem);
1409 atomic_sub(size, &sk->sk_omem_alloc);
1410}
2a91525c 1411EXPORT_SYMBOL(sock_kfree_s);
1da177e4
LT		 1412
1413/* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
1414 I think, these locks should be removed for datagram sockets.
1415 */
2a91525c 1416static long sock_wait_for_wmem(struct sock *sk, long timeo)
1da177e4
LT		 1417{
1418 DEFINE_WAIT(wait);
1419
1420 clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1421 for (;;) {
1422 if (!timeo)
1423 break;
1424 if (signal_pending(current))
1425 break;
1426 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
aa395145 1427 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1da177e4
LT		 1428 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf)
1429 break;
1430 if (sk->sk_shutdown & SEND_SHUTDOWN)
1431 break;
1432 if (sk->sk_err)
1433 break;
1434 timeo = schedule_timeout(timeo);
1435 }
aa395145 1436 finish_wait(sk_sleep(sk), &wait);
1da177e4
LT		 1437 return timeo;
1438}
1439
1440
1441/*
1442 * Generic send/receive buffer handlers
1443 */
1444
4cc7f68d
HX		 1445struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len,
1446 unsigned long data_len, int noblock,
1447 int *errcode)
1da177e4
LT		 1448{
1449 struct sk_buff *skb;
7d877f3b 1450 gfp_t gfp_mask;
1da177e4
LT		 1451 long timeo;
1452 int err;
1453
1454 gfp_mask = sk->sk_allocation;
1455 if (gfp_mask & __GFP_WAIT)
1456 gfp_mask |= __GFP_REPEAT;
1457
1458 timeo = sock_sndtimeo(sk, noblock);
1459 while (1) {
1460 err = sock_error(sk);
1461 if (err != 0)
1462 goto failure;
1463
1464 err = -EPIPE;
1465 if (sk->sk_shutdown & SEND_SHUTDOWN)
1466 goto failure;
1467
1468 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
db38c179 1469 skb = alloc_skb(header_len, gfp_mask);
1da177e4
LT		 1470 if (skb) {
1471 int npages;
1472 int i;
1473
1474 /* No pages, we're done... */
1475 if (!data_len)
1476 break;
1477
1478 npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
1479 skb->truesize += data_len;
1480 skb_shinfo(skb)->nr_frags = npages;
1481 for (i = 0; i < npages; i++) {
1482 struct page *page;
1483 skb_frag_t *frag;
1484
1485 page = alloc_pages(sk->sk_allocation, 0);
1486 if (!page) {
1487 err = -ENOBUFS;
1488 skb_shinfo(skb)->nr_frags = i;
1489 kfree_skb(skb);
1490 goto failure;
1491 }
1492
1493 frag = &skb_shinfo(skb)->frags[i];
1494 frag->page = page;
1495 frag->page_offset = 0;
1496 frag->size = (data_len >= PAGE_SIZE ?
1497 PAGE_SIZE :
1498 data_len);
1499 data_len -= PAGE_SIZE;
1500 }
1501
1502 /* Full success... */
1503 break;
1504 }
1505 err = -ENOBUFS;
1506 goto failure;
1507 }
1508 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1509 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1510 err = -EAGAIN;
1511 if (!timeo)
1512 goto failure;
1513 if (signal_pending(current))
1514 goto interrupted;
1515 timeo = sock_wait_for_wmem(sk, timeo);
1516 }
1517
1518 skb_set_owner_w(skb, sk);
1519 return skb;
1520
1521interrupted:
1522 err = sock_intr_errno(timeo);
1523failure:
1524 *errcode = err;
1525 return NULL;
1526}
4cc7f68d 1527EXPORT_SYMBOL(sock_alloc_send_pskb);
1da177e4 1528
4ec93edb 1529struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
1da177e4
LT		 1530 int noblock, int *errcode)
1531{
1532 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode);
1533}
2a91525c 1534EXPORT_SYMBOL(sock_alloc_send_skb);
1da177e4
LT		 1535
1536static void __lock_sock(struct sock *sk)
1537{
1538 DEFINE_WAIT(wait);
1539
e71a4783 1540 for (;;) {
1da177e4
LT		 1541 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
1542 TASK_UNINTERRUPTIBLE);
1543 spin_unlock_bh(&sk->sk_lock.slock);
1544 schedule();
1545 spin_lock_bh(&sk->sk_lock.slock);
e71a4783 1546 if (!sock_owned_by_user(sk))
1da177e4
LT		 1547 break;
1548 }
1549 finish_wait(&sk->sk_lock.wq, &wait);
1550}
1551
1552static void __release_sock(struct sock *sk)
1553{
1554 struct sk_buff *skb = sk->sk_backlog.head;
1555
1556 do {
1557 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
1558 bh_unlock_sock(sk);
1559
1560 do {
1561 struct sk_buff *next = skb->next;
1562
7fee226a 1563 WARN_ON_ONCE(skb_dst_is_noref(skb));
1da177e4 1564 skb->next = NULL;
c57943a1 1565 sk_backlog_rcv(sk, skb);
1da177e4
LT		 1566
1567 /*
1568 * We are in process context here with softirqs
1569 * disabled, use cond_resched_softirq() to preempt.
1570 * This is safe to do because we've taken the backlog
1571 * queue private:
1572 */
1573 cond_resched_softirq();
1574
1575 skb = next;
1576 } while (skb != NULL);
1577
1578 bh_lock_sock(sk);
e71a4783 1579 } while ((skb = sk->sk_backlog.head) != NULL);
8eae939f
ZY		 1580
1581 /*
1582 * Doing the zeroing here guarantee we can not loop forever
1583 * while a wild producer attempts to flood us.
1584 */
1585 sk->sk_backlog.len = 0;
1da177e4
LT		 1586}
1587
1588/**
1589 * sk_wait_data - wait for data to arrive at sk_receive_queue
4dc3b16b
PP		 1590 * @sk: sock to wait on
1591 * @timeo: for how long
1da177e4
LT		 1592 *
1593 * Now socket state including sk->sk_err is changed only under lock,
1594 * hence we may omit checks after joining wait queue.
1595 * We check receive queue before schedule() only as optimization;
1596 * it is very likely that release_sock() added new data.
1597 */
1598int sk_wait_data(struct sock *sk, long *timeo)
1599{
1600 int rc;
1601 DEFINE_WAIT(wait);
1602
aa395145 1603 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1da177e4
LT		 1604 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1605 rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue));
1606 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
aa395145 1607 finish_wait(sk_sleep(sk), &wait);
1da177e4
LT		 1608 return rc;
1609}
1da177e4
LT		 1610EXPORT_SYMBOL(sk_wait_data);
1611
3ab224be
HA		 1612/**
1613 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated
1614 * @sk: socket
1615 * @size: memory size to allocate
1616 * @kind: allocation type
1617 *
1618 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means
1619 * rmem allocation. This function assumes that protocols which have
1620 * memory_pressure use sk_wmem_queued as write buffer accounting.
1621 */
1622int __sk_mem_schedule(struct sock *sk, int size, int kind)
1623{
1624 struct proto *prot = sk->sk_prot;
1625 int amt = sk_mem_pages(size);
1626 int allocated;
1627
1628 sk->sk_forward_alloc += amt * SK_MEM_QUANTUM;
1629 allocated = atomic_add_return(amt, prot->memory_allocated);
1630
1631 /* Under limit. */
1632 if (allocated <= prot->sysctl_mem[0]) {
1633 if (prot->memory_pressure && *prot->memory_pressure)
1634 *prot->memory_pressure = 0;
1635 return 1;
1636 }
1637
1638 /* Under pressure. */
1639 if (allocated > prot->sysctl_mem[1])
1640 if (prot->enter_memory_pressure)
5c52ba17 1641 prot->enter_memory_pressure(sk);
3ab224be
HA		 1642
1643 /* Over hard limit. */
1644 if (allocated > prot->sysctl_mem[2])
1645 goto suppress_allocation;
1646
1647 /* guarantee minimum buffer size under pressure */
1648 if (kind == SK_MEM_RECV) {
1649 if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0])
1650 return 1;
1651 } else { /* SK_MEM_SEND */
1652 if (sk->sk_type == SOCK_STREAM) {
1653 if (sk->sk_wmem_queued < prot->sysctl_wmem[0])
1654 return 1;
1655 } else if (atomic_read(&sk->sk_wmem_alloc) <
1656 prot->sysctl_wmem[0])
1657 return 1;
1658 }
1659
1660 if (prot->memory_pressure) {
1748376b
ED		 1661 int alloc;
1662
1663 if (!*prot->memory_pressure)
1664 return 1;
1665 alloc = percpu_counter_read_positive(prot->sockets_allocated);
1666 if (prot->sysctl_mem[2] > alloc *
3ab224be
HA		 1667 sk_mem_pages(sk->sk_wmem_queued +
1668 atomic_read(&sk->sk_rmem_alloc) +
1669 sk->sk_forward_alloc))
1670 return 1;
1671 }
1672
1673suppress_allocation:
1674
1675 if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) {
1676 sk_stream_moderate_sndbuf(sk);
1677
1678 /* Fail only if socket is _under_ its sndbuf.
1679 * In this case we cannot block, so that we have to fail.
1680 */
1681 if (sk->sk_wmem_queued + size >= sk->sk_sndbuf)
1682 return 1;
1683 }
1684
1685 /* Alas. Undo changes. */
1686 sk->sk_forward_alloc -= amt * SK_MEM_QUANTUM;
1687 atomic_sub(amt, prot->memory_allocated);
1688 return 0;
1689}
3ab224be
HA		 1690EXPORT_SYMBOL(__sk_mem_schedule);
1691
1692/**
1693 * __sk_reclaim - reclaim memory_allocated
1694 * @sk: socket
1695 */
1696void __sk_mem_reclaim(struct sock *sk)
1697{
1698 struct proto *prot = sk->sk_prot;
1699
680a5a50 1700 atomic_sub(sk->sk_forward_alloc >> SK_MEM_QUANTUM_SHIFT,
3ab224be
HA		 1701 prot->memory_allocated);
1702 sk->sk_forward_alloc &= SK_MEM_QUANTUM - 1;
1703
1704 if (prot->memory_pressure && *prot->memory_pressure &&
1705 (atomic_read(prot->memory_allocated) < prot->sysctl_mem[0]))
1706 *prot->memory_pressure = 0;
1707}
3ab224be
HA		 1708EXPORT_SYMBOL(__sk_mem_reclaim);
1709
1710
1da177e4
LT		 1711/*
1712 * Set of default routines for initialising struct proto_ops when
1713 * the protocol does not support a particular function. In certain
1714 * cases where it makes no sense for a protocol to have a "do nothing"
1715 * function, some default processing is provided.
1716 */
1717
1718int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
1719{
1720 return -EOPNOTSUPP;
1721}
2a91525c 1722EXPORT_SYMBOL(sock_no_bind);
1da177e4 1723
4ec93edb 1724int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 1725 int len, int flags)
1726{
1727 return -EOPNOTSUPP;
1728}
2a91525c 1729EXPORT_SYMBOL(sock_no_connect);
1da177e4
LT		 1730
1731int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
1732{
1733 return -EOPNOTSUPP;
1734}
2a91525c 1735EXPORT_SYMBOL(sock_no_socketpair);
1da177e4
LT		 1736
1737int sock_no_accept(struct socket *sock, struct socket *newsock, int flags)
1738{
1739 return -EOPNOTSUPP;
1740}
2a91525c 1741EXPORT_SYMBOL(sock_no_accept);
1da177e4 1742
4ec93edb 1743int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 1744 int *len, int peer)
1745{
1746 return -EOPNOTSUPP;
1747}
2a91525c 1748EXPORT_SYMBOL(sock_no_getname);
1da177e4 1749
2a91525c 1750unsigned int sock_no_poll(struct file *file, struct socket *sock, poll_table *pt)
1da177e4
LT		 1751{
1752 return 0;
1753}
2a91525c 1754EXPORT_SYMBOL(sock_no_poll);
1da177e4
LT		 1755
1756int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1757{
1758 return -EOPNOTSUPP;
1759}
2a91525c 1760EXPORT_SYMBOL(sock_no_ioctl);
1da177e4
LT		 1761
1762int sock_no_listen(struct socket *sock, int backlog)
1763{
1764 return -EOPNOTSUPP;
1765}
2a91525c 1766EXPORT_SYMBOL(sock_no_listen);
1da177e4
LT		 1767
1768int sock_no_shutdown(struct socket *sock, int how)
1769{
1770 return -EOPNOTSUPP;
1771}
2a91525c 1772EXPORT_SYMBOL(sock_no_shutdown);
1da177e4
LT		 1773
1774int sock_no_setsockopt(struct socket *sock, int level, int optname,
b7058842 1775 char __user *optval, unsigned int optlen)
1da177e4
LT		 1776{
1777 return -EOPNOTSUPP;
1778}
2a91525c 1779EXPORT_SYMBOL(sock_no_setsockopt);
1da177e4
LT		 1780
1781int sock_no_getsockopt(struct socket *sock, int level, int optname,
1782 char __user *optval, int __user *optlen)
1783{
1784 return -EOPNOTSUPP;
1785}
2a91525c 1786EXPORT_SYMBOL(sock_no_getsockopt);
1da177e4
LT		 1787
1788int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
1789 size_t len)
1790{
1791 return -EOPNOTSUPP;
1792}
2a91525c 1793EXPORT_SYMBOL(sock_no_sendmsg);
1da177e4
LT		 1794
1795int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
1796 size_t len, int flags)
1797{
1798 return -EOPNOTSUPP;
1799}
2a91525c 1800EXPORT_SYMBOL(sock_no_recvmsg);
1da177e4
LT		 1801
1802int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
1803{
1804 /* Mirror missing mmap method error code */
1805 return -ENODEV;
1806}
2a91525c 1807EXPORT_SYMBOL(sock_no_mmap);
1da177e4
LT		 1808
1809ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
1810{
1811 ssize_t res;
1812 struct msghdr msg = {.msg_flags = flags};
1813 struct kvec iov;
1814 char *kaddr = kmap(page);
1815 iov.iov_base = kaddr + offset;
1816 iov.iov_len = size;
1817 res = kernel_sendmsg(sock, &msg, &iov, 1, size);
1818 kunmap(page);
1819 return res;
1820}
2a91525c 1821EXPORT_SYMBOL(sock_no_sendpage);
1da177e4
LT		 1822
1823/*
1824 * Default Socket Callbacks
1825 */
1826
1827static void sock_def_wakeup(struct sock *sk)
1828{
43815482
ED		 1829 struct socket_wq *wq;
1830
1831 rcu_read_lock();
1832 wq = rcu_dereference(sk->sk_wq);
1833 if (wq_has_sleeper(wq))
1834 wake_up_interruptible_all(&wq->wait);
1835 rcu_read_unlock();
1da177e4
LT		 1836}
1837
1838static void sock_def_error_report(struct sock *sk)
1839{
43815482
ED		 1840 struct socket_wq *wq;
1841
1842 rcu_read_lock();
1843 wq = rcu_dereference(sk->sk_wq);
1844 if (wq_has_sleeper(wq))
1845 wake_up_interruptible_poll(&wq->wait, POLLERR);
8d8ad9d7 1846 sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR);
43815482 1847 rcu_read_unlock();
1da177e4
LT		 1848}
1849
1850static void sock_def_readable(struct sock *sk, int len)
1851{
43815482
ED		 1852 struct socket_wq *wq;
1853
1854 rcu_read_lock();
1855 wq = rcu_dereference(sk->sk_wq);
1856 if (wq_has_sleeper(wq))
1857 wake_up_interruptible_sync_poll(&wq->wait, POLLIN |
37e5540b 1858 POLLRDNORM | POLLRDBAND);
8d8ad9d7 1859 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
43815482 1860 rcu_read_unlock();
1da177e4
LT		 1861}
1862
1863static void sock_def_write_space(struct sock *sk)
1864{
43815482
ED		 1865 struct socket_wq *wq;
1866
1867 rcu_read_lock();
1da177e4
LT		 1868
1869 /* Do not wake up a writer until he can make "significant"
1870 * progress. --DaveM
1871 */
e71a4783 1872 if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) {
43815482
ED		 1873 wq = rcu_dereference(sk->sk_wq);
1874 if (wq_has_sleeper(wq))
1875 wake_up_interruptible_sync_poll(&wq->wait, POLLOUT |
37e5540b 1876 POLLWRNORM | POLLWRBAND);
1da177e4
LT		 1877
1878 /* Should agree with poll, otherwise some programs break */
1879 if (sock_writeable(sk))
8d8ad9d7 1880 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
1da177e4
LT		 1881 }
1882
43815482 1883 rcu_read_unlock();
1da177e4
LT		 1884}
1885
1886static void sock_def_destruct(struct sock *sk)
1887{
a51482bd 1888 kfree(sk->sk_protinfo);
1da177e4
LT		 1889}
1890
1891void sk_send_sigurg(struct sock *sk)
1892{
1893 if (sk->sk_socket && sk->sk_socket->file)
1894 if (send_sigurg(&sk->sk_socket->file->f_owner))
8d8ad9d7 1895 sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI);
1da177e4 1896}
2a91525c 1897EXPORT_SYMBOL(sk_send_sigurg);
1da177e4
LT		 1898
1899void sk_reset_timer(struct sock *sk, struct timer_list* timer,
1900 unsigned long expires)
1901{
1902 if (!mod_timer(timer, expires))
1903 sock_hold(sk);
1904}
1da177e4
LT		 1905EXPORT_SYMBOL(sk_reset_timer);
1906
1907void sk_stop_timer(struct sock *sk, struct timer_list* timer)
1908{
1909 if (timer_pending(timer) && del_timer(timer))
1910 __sock_put(sk);
1911}
1da177e4
LT		 1912EXPORT_SYMBOL(sk_stop_timer);
1913
1914void sock_init_data(struct socket *sock, struct sock *sk)
1915{
1916 skb_queue_head_init(&sk->sk_receive_queue);
1917 skb_queue_head_init(&sk->sk_write_queue);
1918 skb_queue_head_init(&sk->sk_error_queue);
97fc2f08
CL		 1919#ifdef CONFIG_NET_DMA
1920 skb_queue_head_init(&sk->sk_async_wait_queue);
1921#endif
1da177e4
LT		 1922
1923 sk->sk_send_head = NULL;
1924
1925 init_timer(&sk->sk_timer);
4ec93edb 1926
1da177e4
LT		 1927 sk->sk_allocation = GFP_KERNEL;
1928 sk->sk_rcvbuf = sysctl_rmem_default;
1929 sk->sk_sndbuf = sysctl_wmem_default;
1930 sk->sk_state = TCP_CLOSE;
972692e0 1931 sk_set_socket(sk, sock);
1da177e4
LT		 1932
1933 sock_set_flag(sk, SOCK_ZAPPED);
1934
e71a4783 1935 if (sock) {
1da177e4 1936 sk->sk_type = sock->type;
43815482 1937 sk->sk_wq = sock->wq;
1da177e4
LT		 1938 sock->sk = sk;
1939 } else
43815482 1940 sk->sk_wq = NULL;
1da177e4 1941
b6c6712a 1942 spin_lock_init(&sk->sk_dst_lock);
1da177e4 1943 rwlock_init(&sk->sk_callback_lock);
443aef0e
PZ		 1944 lockdep_set_class_and_name(&sk->sk_callback_lock,
1945 af_callback_keys + sk->sk_family,
1946 af_family_clock_key_strings[sk->sk_family]);
1da177e4
LT		 1947
1948 sk->sk_state_change = sock_def_wakeup;
1949 sk->sk_data_ready = sock_def_readable;
1950 sk->sk_write_space = sock_def_write_space;
1951 sk->sk_error_report = sock_def_error_report;
1952 sk->sk_destruct = sock_def_destruct;
1953
1954 sk->sk_sndmsg_page = NULL;
1955 sk->sk_sndmsg_off = 0;
1956
1957 sk->sk_peercred.pid = 0;
1958 sk->sk_peercred.uid = -1;
1959 sk->sk_peercred.gid = -1;
1960 sk->sk_write_pending = 0;
1961 sk->sk_rcvlowat = 1;
1962 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
1963 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
1964
f37f0afb 1965 sk->sk_stamp = ktime_set(-1L, 0);
1da177e4 1966
4dc6dc71
ED		 1967 /*
1968 * Before updating sk_refcnt, we must commit prior changes to memory
1969 * (Documentation/RCU/rculist_nulls.txt for details)
1970 */
1971 smp_wmb();
1da177e4 1972 atomic_set(&sk->sk_refcnt, 1);
33c732c3 1973 atomic_set(&sk->sk_drops, 0);
1da177e4 1974}
2a91525c 1975EXPORT_SYMBOL(sock_init_data);
1da177e4 1976
b5606c2d 1977void lock_sock_nested(struct sock *sk, int subclass)
1da177e4
LT		 1978{
1979 might_sleep();
a5b5bb9a 1980 spin_lock_bh(&sk->sk_lock.slock);
d2e9117c 1981 if (sk->sk_lock.owned)
1da177e4 1982 __lock_sock(sk);
d2e9117c 1983 sk->sk_lock.owned = 1;
a5b5bb9a
IM		 1984 spin_unlock(&sk->sk_lock.slock);
1985 /*
1986 * The sk_lock has mutex_lock() semantics here:
1987 */
fcc70d5f 1988 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
a5b5bb9a 1989 local_bh_enable();
1da177e4 1990}
fcc70d5f 1991EXPORT_SYMBOL(lock_sock_nested);
1da177e4 1992
b5606c2d 1993void release_sock(struct sock *sk)
1da177e4 1994{
a5b5bb9a
IM		 1995 /*
1996 * The sk_lock has mutex_unlock() semantics:
1997 */
1998 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
1999
2000 spin_lock_bh(&sk->sk_lock.slock);
1da177e4
LT		 2001 if (sk->sk_backlog.tail)
2002 __release_sock(sk);
d2e9117c 2003 sk->sk_lock.owned = 0;
a5b5bb9a
IM		 2004 if (waitqueue_active(&sk->sk_lock.wq))
2005 wake_up(&sk->sk_lock.wq);
2006 spin_unlock_bh(&sk->sk_lock.slock);
1da177e4
LT		 2007}
2008EXPORT_SYMBOL(release_sock);
2009
8a74ad60
ED		 2010/**
2011 * lock_sock_fast - fast version of lock_sock
2012 * @sk: socket
2013 *
2014 * This version should be used for very small section, where process wont block
2015 * return false if fast path is taken
2016 * sk_lock.slock locked, owned = 0, BH disabled
2017 * return true if slow path is taken
2018 * sk_lock.slock unlocked, owned = 1, BH enabled
2019 */
2020bool lock_sock_fast(struct sock *sk)
2021{
2022 might_sleep();
2023 spin_lock_bh(&sk->sk_lock.slock);
2024
2025 if (!sk->sk_lock.owned)
2026 /*
2027 * Note : We must disable BH
2028 */
2029 return false;
2030
2031 __lock_sock(sk);
2032 sk->sk_lock.owned = 1;
2033 spin_unlock(&sk->sk_lock.slock);
2034 /*
2035 * The sk_lock has mutex_lock() semantics here:
2036 */
2037 mutex_acquire(&sk->sk_lock.dep_map, 0, 0, _RET_IP_);
2038 local_bh_enable();
2039 return true;
2040}
2041EXPORT_SYMBOL(lock_sock_fast);
2042
1da177e4 2043int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
4ec93edb 2044{
b7aa0bf7 2045 struct timeval tv;
1da177e4 2046 if (!sock_flag(sk, SOCK_TIMESTAMP))
20d49473 2047 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
b7aa0bf7
ED		 2048 tv = ktime_to_timeval(sk->sk_stamp);
2049 if (tv.tv_sec == -1)
1da177e4 2050 return -ENOENT;
b7aa0bf7
ED		 2051 if (tv.tv_sec == 0) {
2052 sk->sk_stamp = ktime_get_real();
2053 tv = ktime_to_timeval(sk->sk_stamp);
2054 }
2055 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0;
4ec93edb 2056}
1da177e4
LT		 2057EXPORT_SYMBOL(sock_get_timestamp);
2058
ae40eb1e
ED		 2059int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
2060{
2061 struct timespec ts;
2062 if (!sock_flag(sk, SOCK_TIMESTAMP))
20d49473 2063 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
ae40eb1e
ED		 2064 ts = ktime_to_timespec(sk->sk_stamp);
2065 if (ts.tv_sec == -1)
2066 return -ENOENT;
2067 if (ts.tv_sec == 0) {
2068 sk->sk_stamp = ktime_get_real();
2069 ts = ktime_to_timespec(sk->sk_stamp);
2070 }
2071 return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0;
2072}
2073EXPORT_SYMBOL(sock_get_timestampns);
2074
20d49473 2075void sock_enable_timestamp(struct sock *sk, int flag)
4ec93edb 2076{
20d49473
PO		 2077 if (!sock_flag(sk, flag)) {
2078 sock_set_flag(sk, flag);
2079 /*
2080 * we just set one of the two flags which require net
2081 * time stamping, but time stamping might have been on
2082 * already because of the other one
2083 */
2084 if (!sock_flag(sk,
2085 flag == SOCK_TIMESTAMP ?
2086 SOCK_TIMESTAMPING_RX_SOFTWARE :
2087 SOCK_TIMESTAMP))
2088 net_enable_timestamp();
1da177e4
LT		 2089 }
2090}
1da177e4
LT		 2091
2092/*
2093 * Get a socket option on an socket.
2094 *
2095 * FIX: POSIX 1003.1g is very ambiguous here. It states that
2096 * asynchronous errors should be reported by getsockopt. We assume
2097 * this means if you specify SO_ERROR (otherwise whats the point of it).
2098 */
2099int sock_common_getsockopt(struct socket *sock, int level, int optname,
2100 char __user *optval, int __user *optlen)
2101{
2102 struct sock *sk = sock->sk;
2103
2104 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2105}
1da177e4
LT		 2106EXPORT_SYMBOL(sock_common_getsockopt);
2107
3fdadf7d 2108#ifdef CONFIG_COMPAT
543d9cfe
ACM		 2109int compat_sock_common_getsockopt(struct socket *sock, int level, int optname,
2110 char __user *optval, int __user *optlen)
3fdadf7d
DM		 2111{
2112 struct sock *sk = sock->sk;
2113
1e51f951 2114 if (sk->sk_prot->compat_getsockopt != NULL)
543d9cfe
ACM		 2115 return sk->sk_prot->compat_getsockopt(sk, level, optname,
2116 optval, optlen);
3fdadf7d
DM		 2117 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2118}
2119EXPORT_SYMBOL(compat_sock_common_getsockopt);
2120#endif
2121
1da177e4
LT		 2122int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock,
2123 struct msghdr *msg, size_t size, int flags)
2124{
2125 struct sock *sk = sock->sk;
2126 int addr_len = 0;
2127 int err;
2128
2129 err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT,
2130 flags & ~MSG_DONTWAIT, &addr_len);
2131 if (err >= 0)
2132 msg->msg_namelen = addr_len;
2133 return err;
2134}
1da177e4
LT		 2135EXPORT_SYMBOL(sock_common_recvmsg);
2136
2137/*
2138 * Set socket options on an inet socket.
2139 */
2140int sock_common_setsockopt(struct socket *sock, int level, int optname,
b7058842 2141 char __user *optval, unsigned int optlen)
1da177e4
LT		 2142{
2143 struct sock *sk = sock->sk;
2144
2145 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2146}
1da177e4
LT		 2147EXPORT_SYMBOL(sock_common_setsockopt);
2148
3fdadf7d 2149#ifdef CONFIG_COMPAT
543d9cfe 2150int compat_sock_common_setsockopt(struct socket *sock, int level, int optname,
b7058842 2151 char __user *optval, unsigned int optlen)
3fdadf7d
DM		 2152{
2153 struct sock *sk = sock->sk;
2154
543d9cfe
ACM		 2155 if (sk->sk_prot->compat_setsockopt != NULL)
2156 return sk->sk_prot->compat_setsockopt(sk, level, optname,
2157 optval, optlen);
3fdadf7d
DM		 2158 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2159}
2160EXPORT_SYMBOL(compat_sock_common_setsockopt);
2161#endif
2162
1da177e4
LT		 2163void sk_common_release(struct sock *sk)
2164{
2165 if (sk->sk_prot->destroy)
2166 sk->sk_prot->destroy(sk);
2167
2168 /*
2169 * Observation: when sock_common_release is called, processes have
2170 * no access to socket. But net still has.
2171 * Step one, detach it from networking:
2172 *
2173 * A. Remove from hash tables.
2174 */
2175
2176 sk->sk_prot->unhash(sk);
2177
2178 /*
2179 * In this point socket cannot receive new packets, but it is possible
2180 * that some packets are in flight because some CPU runs receiver and
2181 * did hash table lookup before we unhashed socket. They will achieve
2182 * receive queue and will be purged by socket destructor.
2183 *
2184 * Also we still have packets pending on receive queue and probably,
2185 * our own packets waiting in device queues. sock_destroy will drain
2186 * receive queue, but transmitted packets will delay socket destruction
2187 * until the last reference will be released.
2188 */
2189
2190 sock_orphan(sk);
2191
2192 xfrm_sk_free_policy(sk);
2193
e6848976 2194 sk_refcnt_debug_release(sk);
1da177e4
LT		 2195 sock_put(sk);
2196}
1da177e4
LT		 2197EXPORT_SYMBOL(sk_common_release);
2198
2199static DEFINE_RWLOCK(proto_list_lock);
2200static LIST_HEAD(proto_list);
2201
13ff3d6f
PE		 2202#ifdef CONFIG_PROC_FS
2203#define PROTO_INUSE_NR 64 /* should be enough for the first time */
1338d466
PE		 2204struct prot_inuse {
2205 int val[PROTO_INUSE_NR];
2206};
13ff3d6f
PE		 2207
2208static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR);
70ee1159
PE		 2209
2210#ifdef CONFIG_NET_NS
2211void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
2212{
2213 int cpu = smp_processor_id();
2214 per_cpu_ptr(net->core.inuse, cpu)->val[prot->inuse_idx] += val;
2215}
2216EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2217
2218int sock_prot_inuse_get(struct net *net, struct proto *prot)
2219{
2220 int cpu, idx = prot->inuse_idx;
2221 int res = 0;
2222
2223 for_each_possible_cpu(cpu)
2224 res += per_cpu_ptr(net->core.inuse, cpu)->val[idx];
2225
2226 return res >= 0 ? res : 0;
2227}
2228EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
2229
2c8c1e72 2230static int __net_init sock_inuse_init_net(struct net *net)
70ee1159
PE		 2231{
2232 net->core.inuse = alloc_percpu(struct prot_inuse);
2233 return net->core.inuse ? 0 : -ENOMEM;
2234}
2235
2c8c1e72 2236static void __net_exit sock_inuse_exit_net(struct net *net)
70ee1159
PE		 2237{
2238 free_percpu(net->core.inuse);
2239}
2240
2241static struct pernet_operations net_inuse_ops = {
2242 .init = sock_inuse_init_net,
2243 .exit = sock_inuse_exit_net,
2244};
2245
2246static __init int net_inuse_init(void)
2247{
2248 if (register_pernet_subsys(&net_inuse_ops))
2249 panic("Cannot initialize net inuse counters");
2250
2251 return 0;
2252}
2253
2254core_initcall(net_inuse_init);
2255#else
1338d466
PE		 2256static DEFINE_PER_CPU(struct prot_inuse, prot_inuse);
2257
c29a0bc4 2258void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
1338d466
PE		 2259{
2260 __get_cpu_var(prot_inuse).val[prot->inuse_idx] += val;
2261}
2262EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2263
c29a0bc4 2264int sock_prot_inuse_get(struct net *net, struct proto *prot)
1338d466
PE		 2265{
2266 int cpu, idx = prot->inuse_idx;
2267 int res = 0;
2268
2269 for_each_possible_cpu(cpu)
2270 res += per_cpu(prot_inuse, cpu).val[idx];
2271
2272 return res >= 0 ? res : 0;
2273}
2274EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
70ee1159 2275#endif
13ff3d6f
PE		 2276
2277static void assign_proto_idx(struct proto *prot)
2278{
2279 prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR);
2280
2281 if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) {
2282 printk(KERN_ERR "PROTO_INUSE_NR exhausted\n");
2283 return;
2284 }
2285
2286 set_bit(prot->inuse_idx, proto_inuse_idx);
2287}
2288
2289static void release_proto_idx(struct proto *prot)
2290{
2291 if (prot->inuse_idx != PROTO_INUSE_NR - 1)
2292 clear_bit(prot->inuse_idx, proto_inuse_idx);
2293}
2294#else
2295static inline void assign_proto_idx(struct proto *prot)
2296{
2297}
2298
2299static inline void release_proto_idx(struct proto *prot)
2300{
2301}
2302#endif
2303
b733c007
PE		 2304int proto_register(struct proto *prot, int alloc_slab)
2305{
1da177e4
LT		 2306 if (alloc_slab) {
2307 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0,
271b72c7
ED		 2308 SLAB_HWCACHE_ALIGN | prot->slab_flags,
2309 NULL);
1da177e4
LT		 2310
2311 if (prot->slab == NULL) {
2312 printk(KERN_CRIT "%s: Can't create sock SLAB cache!\n",
2313 prot->name);
60e7663d 2314 goto out;
1da177e4 2315 }
2e6599cb
ACM		 2316
2317 if (prot->rsk_prot != NULL) {
faf23422 2318 prot->rsk_prot->slab_name = kasprintf(GFP_KERNEL, "request_sock_%s", prot->name);
7e56b5d6 2319 if (prot->rsk_prot->slab_name == NULL)
2e6599cb
ACM		 2320 goto out_free_sock_slab;
2321
7e56b5d6 2322 prot->rsk_prot->slab = kmem_cache_create(prot->rsk_prot->slab_name,
2e6599cb 2323 prot->rsk_prot->obj_size, 0,
20c2df83 2324 SLAB_HWCACHE_ALIGN, NULL);
2e6599cb
ACM		 2325
2326 if (prot->rsk_prot->slab == NULL) {
2327 printk(KERN_CRIT "%s: Can't create request sock SLAB cache!\n",
2328 prot->name);
2329 goto out_free_request_sock_slab_name;
2330 }
2331 }
8feaf0c0 2332
6d6ee43e 2333 if (prot->twsk_prot != NULL) {
faf23422 2334 prot->twsk_prot->twsk_slab_name = kasprintf(GFP_KERNEL, "tw_sock_%s", prot->name);
8feaf0c0 2335
7e56b5d6 2336 if (prot->twsk_prot->twsk_slab_name == NULL)
8feaf0c0
ACM		 2337 goto out_free_request_sock_slab;
2338
6d6ee43e 2339 prot->twsk_prot->twsk_slab =
7e56b5d6 2340 kmem_cache_create(prot->twsk_prot->twsk_slab_name,
6d6ee43e 2341 prot->twsk_prot->twsk_obj_size,
3ab5aee7
ED		 2342 0,
2343 SLAB_HWCACHE_ALIGN |
2344 prot->slab_flags,
20c2df83 2345 NULL);
6d6ee43e 2346 if (prot->twsk_prot->twsk_slab == NULL)
8feaf0c0
ACM		 2347 goto out_free_timewait_sock_slab_name;
2348 }
1da177e4
LT		 2349 }
2350
2a278051 2351 write_lock(&proto_list_lock);
1da177e4 2352 list_add(&prot->node, &proto_list);
13ff3d6f 2353 assign_proto_idx(prot);
1da177e4 2354 write_unlock(&proto_list_lock);
b733c007
PE		 2355 return 0;
2356
8feaf0c0 2357out_free_timewait_sock_slab_name:
7e56b5d6 2358 kfree(prot->twsk_prot->twsk_slab_name);
8feaf0c0
ACM		 2359out_free_request_sock_slab:
2360 if (prot->rsk_prot && prot->rsk_prot->slab) {
2361 kmem_cache_destroy(prot->rsk_prot->slab);
2362 prot->rsk_prot->slab = NULL;
2363 }
2e6599cb 2364out_free_request_sock_slab_name:
72150e9b
DC		 2365 if (prot->rsk_prot)
2366 kfree(prot->rsk_prot->slab_name);
2e6599cb
ACM		 2367out_free_sock_slab:
2368 kmem_cache_destroy(prot->slab);
2369 prot->slab = NULL;
b733c007
PE		 2370out:
2371 return -ENOBUFS;
1da177e4 2372}
1da177e4
LT		 2373EXPORT_SYMBOL(proto_register);
2374
2375void proto_unregister(struct proto *prot)
2376{
2377 write_lock(&proto_list_lock);
13ff3d6f 2378 release_proto_idx(prot);
0a3f4358
PM		 2379 list_del(&prot->node);
2380 write_unlock(&proto_list_lock);
1da177e4
LT		 2381
2382 if (prot->slab != NULL) {
2383 kmem_cache_destroy(prot->slab);
2384 prot->slab = NULL;
2385 }
2386
2e6599cb 2387 if (prot->rsk_prot != NULL && prot->rsk_prot->slab != NULL) {
2e6599cb 2388 kmem_cache_destroy(prot->rsk_prot->slab);
7e56b5d6 2389 kfree(prot->rsk_prot->slab_name);
2e6599cb
ACM		 2390 prot->rsk_prot->slab = NULL;
2391 }
2392
6d6ee43e 2393 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) {
6d6ee43e 2394 kmem_cache_destroy(prot->twsk_prot->twsk_slab);
7e56b5d6 2395 kfree(prot->twsk_prot->twsk_slab_name);
6d6ee43e 2396 prot->twsk_prot->twsk_slab = NULL;
8feaf0c0 2397 }
1da177e4 2398}
1da177e4
LT		 2399EXPORT_SYMBOL(proto_unregister);
2400
2401#ifdef CONFIG_PROC_FS
1da177e4 2402static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
9a429c49 2403 __acquires(proto_list_lock)
1da177e4
LT		 2404{
2405 read_lock(&proto_list_lock);
60f0438a 2406 return seq_list_start_head(&proto_list, *pos);
1da177e4
LT		 2407}
2408
2409static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2410{
60f0438a 2411 return seq_list_next(v, &proto_list, pos);
1da177e4
LT		 2412}
2413
2414static void proto_seq_stop(struct seq_file *seq, void *v)
9a429c49 2415 __releases(proto_list_lock)
1da177e4
LT		 2416{
2417 read_unlock(&proto_list_lock);
2418}
2419
2420static char proto_method_implemented(const void *method)
2421{
2422 return method == NULL ? 'n' : 'y';
2423}
2424
2425static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
2426{
2427 seq_printf(seq, "%-9s %4u %6d %6d %-3s %6u %-3s %-10s "
2428 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
2429 proto->name,
2430 proto->obj_size,
14e943db 2431 sock_prot_inuse_get(seq_file_net(seq), proto),
1da177e4
LT		 2432 proto->memory_allocated != NULL ? atomic_read(proto->memory_allocated) : -1,
2433 proto->memory_pressure != NULL ? *proto->memory_pressure ? "yes" : "no" : "NI",
2434 proto->max_header,
2435 proto->slab == NULL ? "no" : "yes",
2436 module_name(proto->owner),
2437 proto_method_implemented(proto->close),
2438 proto_method_implemented(proto->connect),
2439 proto_method_implemented(proto->disconnect),
2440 proto_method_implemented(proto->accept),
2441 proto_method_implemented(proto->ioctl),
2442 proto_method_implemented(proto->init),
2443 proto_method_implemented(proto->destroy),
2444 proto_method_implemented(proto->shutdown),
2445 proto_method_implemented(proto->setsockopt),
2446 proto_method_implemented(proto->getsockopt),
2447 proto_method_implemented(proto->sendmsg),
2448 proto_method_implemented(proto->recvmsg),
2449 proto_method_implemented(proto->sendpage),
2450 proto_method_implemented(proto->bind),
2451 proto_method_implemented(proto->backlog_rcv),
2452 proto_method_implemented(proto->hash),
2453 proto_method_implemented(proto->unhash),
2454 proto_method_implemented(proto->get_port),
2455 proto_method_implemented(proto->enter_memory_pressure));
2456}
2457
2458static int proto_seq_show(struct seq_file *seq, void *v)
2459{
60f0438a 2460 if (v == &proto_list)
1da177e4
LT		 2461 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
2462 "protocol",
2463 "size",
2464 "sockets",
2465 "memory",
2466 "press",
2467 "maxhdr",
2468 "slab",
2469 "module",
2470 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
2471 else
60f0438a 2472 proto_seq_printf(seq, list_entry(v, struct proto, node));
1da177e4
LT		 2473 return 0;
2474}
2475
f690808e 2476static const struct seq_operations proto_seq_ops = {
1da177e4
LT		 2477 .start = proto_seq_start,
2478 .next = proto_seq_next,
2479 .stop = proto_seq_stop,
2480 .show = proto_seq_show,
2481};
2482
2483static int proto_seq_open(struct inode *inode, struct file *file)
2484{
14e943db
ED		 2485 return seq_open_net(inode, file, &proto_seq_ops,
2486 sizeof(struct seq_net_private));
1da177e4
LT		 2487}
2488
9a32144e 2489static const struct file_operations proto_seq_fops = {
1da177e4
LT		 2490 .owner = THIS_MODULE,
2491 .open = proto_seq_open,
2492 .read = seq_read,
2493 .llseek = seq_lseek,
14e943db
ED		 2494 .release = seq_release_net,
2495};
2496
2497static __net_init int proto_init_net(struct net *net)
2498{
2499 if (!proc_net_fops_create(net, "protocols", S_IRUGO, &proto_seq_fops))
2500 return -ENOMEM;
2501
2502 return 0;
2503}
2504
2505static __net_exit void proto_exit_net(struct net *net)
2506{
2507 proc_net_remove(net, "protocols");
2508}
2509
2510
2511static __net_initdata struct pernet_operations proto_net_ops = {
2512 .init = proto_init_net,
2513 .exit = proto_exit_net,
1da177e4
LT		 2514};
2515
2516static int __init proto_init(void)
2517{
14e943db 2518 return register_pernet_subsys(&proto_net_ops);
1da177e4
LT		 2519}
2520
2521subsys_initcall(proto_init);
2522
2523#endif /* PROC_FS */
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