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net/irda: bfin_sir: IRDA is not affected by anomaly 05000230
[mirror_ubuntu-bionic-kernel.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>
126
127#include <linux/filter.h>
128
129#ifdef CONFIG_INET
130#include <net/tcp.h>
131#endif
132
da21f24d
IM		 133/*
134 * Each address family might have different locking rules, so we have
135 * one slock key per address family:
136 */
a5b5bb9a
IM		 137static struct lock_class_key af_family_keys[AF_MAX];
138static struct lock_class_key af_family_slock_keys[AF_MAX];
139
a5b5bb9a
IM		 140/*
141 * Make lock validator output more readable. (we pre-construct these
142 * strings build-time, so that runtime initialization of socket
143 * locks is fast):
144 */
36cbd3dc 145static const char *const af_family_key_strings[AF_MAX+1] = {
a5b5bb9a
IM		 146 "sk_lock-AF_UNSPEC", "sk_lock-AF_UNIX" , "sk_lock-AF_INET" ,
147 "sk_lock-AF_AX25" , "sk_lock-AF_IPX" , "sk_lock-AF_APPLETALK",
148 "sk_lock-AF_NETROM", "sk_lock-AF_BRIDGE" , "sk_lock-AF_ATMPVC" ,
149 "sk_lock-AF_X25" , "sk_lock-AF_INET6" , "sk_lock-AF_ROSE" ,
150 "sk_lock-AF_DECnet", "sk_lock-AF_NETBEUI" , "sk_lock-AF_SECURITY" ,
151 "sk_lock-AF_KEY" , "sk_lock-AF_NETLINK" , "sk_lock-AF_PACKET" ,
152 "sk_lock-AF_ASH" , "sk_lock-AF_ECONET" , "sk_lock-AF_ATMSVC" ,
cbd151bf 153 "sk_lock-AF_RDS" , "sk_lock-AF_SNA" , "sk_lock-AF_IRDA" ,
a5b5bb9a 154 "sk_lock-AF_PPPOX" , "sk_lock-AF_WANPIPE" , "sk_lock-AF_LLC" ,
cd05acfe 155 "sk_lock-27" , "sk_lock-28" , "sk_lock-AF_CAN" ,
17926a79 156 "sk_lock-AF_TIPC" , "sk_lock-AF_BLUETOOTH", "sk_lock-IUCV" ,
bce7b154 157 "sk_lock-AF_RXRPC" , "sk_lock-AF_ISDN" , "sk_lock-AF_PHONET" ,
fcb94e42 158 "sk_lock-AF_IEEE802154",
bce7b154 159 "sk_lock-AF_MAX"
a5b5bb9a 160};
36cbd3dc 161static const char *const af_family_slock_key_strings[AF_MAX+1] = {
a5b5bb9a
IM		 162 "slock-AF_UNSPEC", "slock-AF_UNIX" , "slock-AF_INET" ,
163 "slock-AF_AX25" , "slock-AF_IPX" , "slock-AF_APPLETALK",
164 "slock-AF_NETROM", "slock-AF_BRIDGE" , "slock-AF_ATMPVC" ,
165 "slock-AF_X25" , "slock-AF_INET6" , "slock-AF_ROSE" ,
166 "slock-AF_DECnet", "slock-AF_NETBEUI" , "slock-AF_SECURITY" ,
167 "slock-AF_KEY" , "slock-AF_NETLINK" , "slock-AF_PACKET" ,
168 "slock-AF_ASH" , "slock-AF_ECONET" , "slock-AF_ATMSVC" ,
cbd151bf 169 "slock-AF_RDS" , "slock-AF_SNA" , "slock-AF_IRDA" ,
a5b5bb9a 170 "slock-AF_PPPOX" , "slock-AF_WANPIPE" , "slock-AF_LLC" ,
cd05acfe 171 "slock-27" , "slock-28" , "slock-AF_CAN" ,
17926a79 172 "slock-AF_TIPC" , "slock-AF_BLUETOOTH", "slock-AF_IUCV" ,
bce7b154 173 "slock-AF_RXRPC" , "slock-AF_ISDN" , "slock-AF_PHONET" ,
fcb94e42 174 "slock-AF_IEEE802154",
bce7b154 175 "slock-AF_MAX"
a5b5bb9a 176};
36cbd3dc 177static const char *const af_family_clock_key_strings[AF_MAX+1] = {
443aef0e
PZ		 178 "clock-AF_UNSPEC", "clock-AF_UNIX" , "clock-AF_INET" ,
179 "clock-AF_AX25" , "clock-AF_IPX" , "clock-AF_APPLETALK",
180 "clock-AF_NETROM", "clock-AF_BRIDGE" , "clock-AF_ATMPVC" ,
181 "clock-AF_X25" , "clock-AF_INET6" , "clock-AF_ROSE" ,
182 "clock-AF_DECnet", "clock-AF_NETBEUI" , "clock-AF_SECURITY" ,
183 "clock-AF_KEY" , "clock-AF_NETLINK" , "clock-AF_PACKET" ,
184 "clock-AF_ASH" , "clock-AF_ECONET" , "clock-AF_ATMSVC" ,
cbd151bf 185 "clock-AF_RDS" , "clock-AF_SNA" , "clock-AF_IRDA" ,
443aef0e 186 "clock-AF_PPPOX" , "clock-AF_WANPIPE" , "clock-AF_LLC" ,
b4942af6 187 "clock-27" , "clock-28" , "clock-AF_CAN" ,
e51f802b 188 "clock-AF_TIPC" , "clock-AF_BLUETOOTH", "clock-AF_IUCV" ,
bce7b154 189 "clock-AF_RXRPC" , "clock-AF_ISDN" , "clock-AF_PHONET" ,
fcb94e42 190 "clock-AF_IEEE802154",
bce7b154 191 "clock-AF_MAX"
443aef0e 192};
da21f24d
IM		 193
194/*
195 * sk_callback_lock locking rules are per-address-family,
196 * so split the lock classes by using a per-AF key:
197 */
198static struct lock_class_key af_callback_keys[AF_MAX];
199
1da177e4
LT		 200/* Take into consideration the size of the struct sk_buff overhead in the
201 * determination of these values, since that is non-constant across
202 * platforms. This makes socket queueing behavior and performance
203 * not depend upon such differences.
204 */
205#define _SK_MEM_PACKETS 256
206#define _SK_MEM_OVERHEAD (sizeof(struct sk_buff) + 256)
207#define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
208#define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
209
210/* Run time adjustable parameters. */
ab32ea5d
BH		 211__u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX;
212__u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX;
213__u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX;
214__u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX;
1da177e4
LT		 215
216/* Maximal space eaten by iovec or ancilliary data plus some space */
ab32ea5d 217int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512);
2a91525c 218EXPORT_SYMBOL(sysctl_optmem_max);
1da177e4
LT		 219
220static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen)
221{
222 struct timeval tv;
223
224 if (optlen < sizeof(tv))
225 return -EINVAL;
226 if (copy_from_user(&tv, optval, sizeof(tv)))
227 return -EFAULT;
ba78073e
VA		 228 if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC)
229 return -EDOM;
1da177e4 230
ba78073e 231 if (tv.tv_sec < 0) {
6f11df83
AM		 232 static int warned __read_mostly;
233
ba78073e 234 *timeo_p = 0;
50aab54f 235 if (warned < 10 && net_ratelimit()) {
ba78073e
VA		 236 warned++;
237 printk(KERN_INFO "sock_set_timeout: `%s' (pid %d) "
238 "tries to set negative timeout\n",
ba25f9dc 239 current->comm, task_pid_nr(current));
50aab54f 240 }
ba78073e
VA		 241 return 0;
242 }
1da177e4
LT		 243 *timeo_p = MAX_SCHEDULE_TIMEOUT;
244 if (tv.tv_sec == 0 && tv.tv_usec == 0)
245 return 0;
246 if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1))
247 *timeo_p = tv.tv_sec*HZ + (tv.tv_usec+(1000000/HZ-1))/(1000000/HZ);
248 return 0;
249}
250
251static void sock_warn_obsolete_bsdism(const char *name)
252{
253 static int warned;
254 static char warncomm[TASK_COMM_LEN];
4ec93edb
YH		 255 if (strcmp(warncomm, current->comm) && warned < 5) {
256 strcpy(warncomm, current->comm);
1da177e4
LT		 257 printk(KERN_WARNING "process `%s' is using obsolete "
258 "%s SO_BSDCOMPAT\n", warncomm, name);
259 warned++;
260 }
261}
262
20d49473 263static void sock_disable_timestamp(struct sock *sk, int flag)
4ec93edb 264{
20d49473
PO		 265 if (sock_flag(sk, flag)) {
266 sock_reset_flag(sk, flag);
267 if (!sock_flag(sk, SOCK_TIMESTAMP) &&
268 !sock_flag(sk, SOCK_TIMESTAMPING_RX_SOFTWARE)) {
269 net_disable_timestamp();
270 }
1da177e4
LT		 271 }
272}
273
274
f0088a50
DV		 275int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
276{
766e9037 277 int err;
f0088a50 278 int skb_len;
3b885787
NH		 279 unsigned long flags;
280 struct sk_buff_head *list = &sk->sk_receive_queue;
f0088a50 281
9ee6b7f1 282 /* Cast sk->rcvbuf to unsigned... It's pointless, but reduces
f0088a50
DV		 283 number of warnings when compiling with -W --ANK
284 */
285 if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >=
286 (unsigned)sk->sk_rcvbuf) {
766e9037
ED		 287 atomic_inc(&sk->sk_drops);
288 return -ENOMEM;
f0088a50
DV		 289 }
290
fda9ef5d 291 err = sk_filter(sk, skb);
f0088a50 292 if (err)
766e9037 293 return err;
f0088a50 294
3ab224be 295 if (!sk_rmem_schedule(sk, skb->truesize)) {
766e9037
ED		 296 atomic_inc(&sk->sk_drops);
297 return -ENOBUFS;
3ab224be
HA		 298 }
299
f0088a50
DV		 300 skb->dev = NULL;
301 skb_set_owner_r(skb, sk);
49ad9599 302
f0088a50
DV		 303 /* Cache the SKB length before we tack it onto the receive
304 * queue. Once it is added it no longer belongs to us and
305 * may be freed by other threads of control pulling packets
306 * from the queue.
307 */
308 skb_len = skb->len;
309
7fee226a
ED		 310 /* we escape from rcu protected region, make sure we dont leak
311 * a norefcounted dst
312 */
313 skb_dst_force(skb);
314
3b885787
NH		 315 spin_lock_irqsave(&list->lock, flags);
316 skb->dropcount = atomic_read(&sk->sk_drops);
317 __skb_queue_tail(list, skb);
318 spin_unlock_irqrestore(&list->lock, flags);
f0088a50
DV		 319
320 if (!sock_flag(sk, SOCK_DEAD))
321 sk->sk_data_ready(sk, skb_len);
766e9037 322 return 0;
f0088a50
DV		 323}
324EXPORT_SYMBOL(sock_queue_rcv_skb);
325
58a5a7b9 326int sk_receive_skb(struct sock *sk, struct sk_buff *skb, const int nested)
f0088a50
DV		 327{
328 int rc = NET_RX_SUCCESS;
329
fda9ef5d 330 if (sk_filter(sk, skb))
f0088a50
DV		 331 goto discard_and_relse;
332
333 skb->dev = NULL;
334
c377411f
ED		 335 if (sk_rcvqueues_full(sk, skb)) {
336 atomic_inc(&sk->sk_drops);
337 goto discard_and_relse;
338 }
58a5a7b9
ACM		 339 if (nested)
340 bh_lock_sock_nested(sk);
341 else
342 bh_lock_sock(sk);
a5b5bb9a
IM		 343 if (!sock_owned_by_user(sk)) {
344 /*
345 * trylock + unlock semantics:
346 */
347 mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_);
348
c57943a1 349 rc = sk_backlog_rcv(sk, skb);
a5b5bb9a
IM		 350
351 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
a3a858ff 352 } else if (sk_add_backlog(sk, skb)) {
8eae939f
ZY		 353 bh_unlock_sock(sk);
354 atomic_inc(&sk->sk_drops);
355 goto discard_and_relse;
356 }
357
f0088a50
DV		 358 bh_unlock_sock(sk);
359out:
360 sock_put(sk);
361 return rc;
362discard_and_relse:
363 kfree_skb(skb);
364 goto out;
365}
366EXPORT_SYMBOL(sk_receive_skb);
367
ea94ff3b
KK		 368void sk_reset_txq(struct sock *sk)
369{
370 sk_tx_queue_clear(sk);
371}
372EXPORT_SYMBOL(sk_reset_txq);
373
f0088a50
DV		 374struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie)
375{
b6c6712a 376 struct dst_entry *dst = __sk_dst_get(sk);
f0088a50
DV		 377
378 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
e022f0b4 379 sk_tx_queue_clear(sk);
b6c6712a 380 rcu_assign_pointer(sk->sk_dst_cache, NULL);
f0088a50
DV		 381 dst_release(dst);
382 return NULL;
383 }
384
385 return dst;
386}
387EXPORT_SYMBOL(__sk_dst_check);
388
389struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie)
390{
391 struct dst_entry *dst = sk_dst_get(sk);
392
393 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
394 sk_dst_reset(sk);
395 dst_release(dst);
396 return NULL;
397 }
398
399 return dst;
400}
401EXPORT_SYMBOL(sk_dst_check);
402
4878809f
DM		 403static int sock_bindtodevice(struct sock *sk, char __user *optval, int optlen)
404{
405 int ret = -ENOPROTOOPT;
406#ifdef CONFIG_NETDEVICES
3b1e0a65 407 struct net *net = sock_net(sk);
4878809f
DM		 408 char devname[IFNAMSIZ];
409 int index;
410
411 /* Sorry... */
412 ret = -EPERM;
413 if (!capable(CAP_NET_RAW))
414 goto out;
415
416 ret = -EINVAL;
417 if (optlen < 0)
418 goto out;
419
420 /* Bind this socket to a particular device like "eth0",
421 * as specified in the passed interface name. If the
422 * name is "" or the option length is zero the socket
423 * is not bound.
424 */
425 if (optlen > IFNAMSIZ - 1)
426 optlen = IFNAMSIZ - 1;
427 memset(devname, 0, sizeof(devname));
428
429 ret = -EFAULT;
430 if (copy_from_user(devname, optval, optlen))
431 goto out;
432
000ba2e4
DM		 433 index = 0;
434 if (devname[0] != '\0') {
bf8e56bf 435 struct net_device *dev;
4878809f 436
bf8e56bf
ED		 437 rcu_read_lock();
438 dev = dev_get_by_name_rcu(net, devname);
439 if (dev)
440 index = dev->ifindex;
441 rcu_read_unlock();
4878809f
DM		 442 ret = -ENODEV;
443 if (!dev)
444 goto out;
4878809f
DM		 445 }
446
447 lock_sock(sk);
448 sk->sk_bound_dev_if = index;
449 sk_dst_reset(sk);
450 release_sock(sk);
451
452 ret = 0;
453
454out:
455#endif
456
457 return ret;
458}
459
c0ef877b
PE		 460static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool)
461{
462 if (valbool)
463 sock_set_flag(sk, bit);
464 else
465 sock_reset_flag(sk, bit);
466}
467
1da177e4
LT		 468/*
469 * This is meant for all protocols to use and covers goings on
470 * at the socket level. Everything here is generic.
471 */
472
473int sock_setsockopt(struct socket *sock, int level, int optname,
b7058842 474 char __user *optval, unsigned int optlen)
1da177e4 475{
2a91525c 476 struct sock *sk = sock->sk;
1da177e4
LT		 477 int val;
478 int valbool;
479 struct linger ling;
480 int ret = 0;
4ec93edb 481
1da177e4
LT		 482 /*
483 * Options without arguments
484 */
485
4878809f
DM		 486 if (optname == SO_BINDTODEVICE)
487 return sock_bindtodevice(sk, optval, optlen);
488
e71a4783
SH		 489 if (optlen < sizeof(int))
490 return -EINVAL;
4ec93edb 491
1da177e4
LT		 492 if (get_user(val, (int __user *)optval))
493 return -EFAULT;
4ec93edb 494
2a91525c 495 valbool = val ? 1 : 0;
1da177e4
LT		 496
497 lock_sock(sk);
498
2a91525c 499 switch (optname) {
e71a4783 500 case SO_DEBUG:
2a91525c 501 if (val && !capable(CAP_NET_ADMIN))
e71a4783 502 ret = -EACCES;
2a91525c 503 else
c0ef877b 504 sock_valbool_flag(sk, SOCK_DBG, valbool);
e71a4783
SH		 505 break;
506 case SO_REUSEADDR:
507 sk->sk_reuse = valbool;
508 break;
509 case SO_TYPE:
49c794e9 510 case SO_PROTOCOL:
0d6038ee 511 case SO_DOMAIN:
e71a4783
SH		 512 case SO_ERROR:
513 ret = -ENOPROTOOPT;
514 break;
515 case SO_DONTROUTE:
c0ef877b 516 sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool);
e71a4783
SH		 517 break;
518 case SO_BROADCAST:
519 sock_valbool_flag(sk, SOCK_BROADCAST, valbool);
520 break;
521 case SO_SNDBUF:
522 /* Don't error on this BSD doesn't and if you think
523 about it this is right. Otherwise apps have to
524 play 'guess the biggest size' games. RCVBUF/SNDBUF
525 are treated in BSD as hints */
526
527 if (val > sysctl_wmem_max)
528 val = sysctl_wmem_max;
b0573dea 529set_sndbuf:
e71a4783
SH		 530 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
531 if ((val * 2) < SOCK_MIN_SNDBUF)
532 sk->sk_sndbuf = SOCK_MIN_SNDBUF;
533 else
534 sk->sk_sndbuf = val * 2;
1da177e4 535
e71a4783
SH		 536 /*
537 * Wake up sending tasks if we
538 * upped the value.
539 */
540 sk->sk_write_space(sk);
541 break;
1da177e4 542
e71a4783
SH		 543 case SO_SNDBUFFORCE:
544 if (!capable(CAP_NET_ADMIN)) {
545 ret = -EPERM;
546 break;
547 }
548 goto set_sndbuf;
b0573dea 549
e71a4783
SH		 550 case SO_RCVBUF:
551 /* Don't error on this BSD doesn't and if you think
552 about it this is right. Otherwise apps have to
553 play 'guess the biggest size' games. RCVBUF/SNDBUF
554 are treated in BSD as hints */
4ec93edb 555
e71a4783
SH		 556 if (val > sysctl_rmem_max)
557 val = sysctl_rmem_max;
b0573dea 558set_rcvbuf:
e71a4783
SH		 559 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
560 /*
561 * We double it on the way in to account for
562 * "struct sk_buff" etc. overhead. Applications
563 * assume that the SO_RCVBUF setting they make will
564 * allow that much actual data to be received on that
565 * socket.
566 *
567 * Applications are unaware that "struct sk_buff" and
568 * other overheads allocate from the receive buffer
569 * during socket buffer allocation.
570 *
571 * And after considering the possible alternatives,
572 * returning the value we actually used in getsockopt
573 * is the most desirable behavior.
574 */
575 if ((val * 2) < SOCK_MIN_RCVBUF)
576 sk->sk_rcvbuf = SOCK_MIN_RCVBUF;
577 else
578 sk->sk_rcvbuf = val * 2;
579 break;
580
581 case SO_RCVBUFFORCE:
582 if (!capable(CAP_NET_ADMIN)) {
583 ret = -EPERM;
1da177e4 584 break;
e71a4783
SH		 585 }
586 goto set_rcvbuf;
1da177e4 587
e71a4783 588 case SO_KEEPALIVE:
1da177e4 589#ifdef CONFIG_INET
e71a4783
SH		 590 if (sk->sk_protocol == IPPROTO_TCP)
591 tcp_set_keepalive(sk, valbool);
1da177e4 592#endif
e71a4783
SH		 593 sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool);
594 break;
595
596 case SO_OOBINLINE:
597 sock_valbool_flag(sk, SOCK_URGINLINE, valbool);
598 break;
599
600 case SO_NO_CHECK:
601 sk->sk_no_check = valbool;
602 break;
603
604 case SO_PRIORITY:
605 if ((val >= 0 && val <= 6) || capable(CAP_NET_ADMIN))
606 sk->sk_priority = val;
607 else
608 ret = -EPERM;
609 break;
610
611 case SO_LINGER:
612 if (optlen < sizeof(ling)) {
613 ret = -EINVAL; /* 1003.1g */
1da177e4 614 break;
e71a4783 615 }
2a91525c 616 if (copy_from_user(&ling, optval, sizeof(ling))) {
e71a4783 617 ret = -EFAULT;
1da177e4 618 break;
e71a4783
SH		 619 }
620 if (!ling.l_onoff)
621 sock_reset_flag(sk, SOCK_LINGER);
622 else {
1da177e4 623#if (BITS_PER_LONG == 32)
e71a4783
SH		 624 if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ)
625 sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT;
1da177e4 626 else
e71a4783
SH		 627#endif
628 sk->sk_lingertime = (unsigned int)ling.l_linger * HZ;
629 sock_set_flag(sk, SOCK_LINGER);
630 }
631 break;
632
633 case SO_BSDCOMPAT:
634 sock_warn_obsolete_bsdism("setsockopt");
635 break;
636
637 case SO_PASSCRED:
638 if (valbool)
639 set_bit(SOCK_PASSCRED, &sock->flags);
640 else
641 clear_bit(SOCK_PASSCRED, &sock->flags);
642 break;
643
644 case SO_TIMESTAMP:
92f37fd2 645 case SO_TIMESTAMPNS:
e71a4783 646 if (valbool) {
92f37fd2
ED		 647 if (optname == SO_TIMESTAMP)
648 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
649 else
650 sock_set_flag(sk, SOCK_RCVTSTAMPNS);
e71a4783 651 sock_set_flag(sk, SOCK_RCVTSTAMP);
20d49473 652 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
92f37fd2 653 } else {
e71a4783 654 sock_reset_flag(sk, SOCK_RCVTSTAMP);
92f37fd2
ED		 655 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
656 }
e71a4783
SH		 657 break;
658
20d49473
PO		 659 case SO_TIMESTAMPING:
660 if (val & ~SOF_TIMESTAMPING_MASK) {
f249fb78 661 ret = -EINVAL;
20d49473
PO		 662 break;
663 }
664 sock_valbool_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE,
665 val & SOF_TIMESTAMPING_TX_HARDWARE);
666 sock_valbool_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE,
667 val & SOF_TIMESTAMPING_TX_SOFTWARE);
668 sock_valbool_flag(sk, SOCK_TIMESTAMPING_RX_HARDWARE,
669 val & SOF_TIMESTAMPING_RX_HARDWARE);
670 if (val & SOF_TIMESTAMPING_RX_SOFTWARE)
671 sock_enable_timestamp(sk,
672 SOCK_TIMESTAMPING_RX_SOFTWARE);
673 else
674 sock_disable_timestamp(sk,
675 SOCK_TIMESTAMPING_RX_SOFTWARE);
676 sock_valbool_flag(sk, SOCK_TIMESTAMPING_SOFTWARE,
677 val & SOF_TIMESTAMPING_SOFTWARE);
678 sock_valbool_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE,
679 val & SOF_TIMESTAMPING_SYS_HARDWARE);
680 sock_valbool_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE,
681 val & SOF_TIMESTAMPING_RAW_HARDWARE);
682 break;
683
e71a4783
SH		 684 case SO_RCVLOWAT:
685 if (val < 0)
686 val = INT_MAX;
687 sk->sk_rcvlowat = val ? : 1;
688 break;
689
690 case SO_RCVTIMEO:
691 ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen);
692 break;
693
694 case SO_SNDTIMEO:
695 ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen);
696 break;
1da177e4 697
e71a4783
SH		 698 case SO_ATTACH_FILTER:
699 ret = -EINVAL;
700 if (optlen == sizeof(struct sock_fprog)) {
701 struct sock_fprog fprog;
1da177e4 702
e71a4783
SH		 703 ret = -EFAULT;
704 if (copy_from_user(&fprog, optval, sizeof(fprog)))
1da177e4 705 break;
e71a4783
SH		 706
707 ret = sk_attach_filter(&fprog, sk);
708 }
709 break;
710
711 case SO_DETACH_FILTER:
55b33325 712 ret = sk_detach_filter(sk);
e71a4783 713 break;
1da177e4 714
e71a4783
SH		 715 case SO_PASSSEC:
716 if (valbool)
717 set_bit(SOCK_PASSSEC, &sock->flags);
718 else
719 clear_bit(SOCK_PASSSEC, &sock->flags);
720 break;
4a19ec58
LAT		 721 case SO_MARK:
722 if (!capable(CAP_NET_ADMIN))
723 ret = -EPERM;
2a91525c 724 else
4a19ec58 725 sk->sk_mark = val;
4a19ec58 726 break;
877ce7c1 727
1da177e4
LT		 728 /* We implement the SO_SNDLOWAT etc to
729 not be settable (1003.1g 5.3) */
3b885787
NH		 730 case SO_RXQ_OVFL:
731 if (valbool)
732 sock_set_flag(sk, SOCK_RXQ_OVFL);
733 else
734 sock_reset_flag(sk, SOCK_RXQ_OVFL);
735 break;
e71a4783
SH		 736 default:
737 ret = -ENOPROTOOPT;
738 break;
4ec93edb 739 }
1da177e4
LT		 740 release_sock(sk);
741 return ret;
742}
2a91525c 743EXPORT_SYMBOL(sock_setsockopt);
1da177e4
LT		 744
745
746int sock_getsockopt(struct socket *sock, int level, int optname,
747 char __user *optval, int __user *optlen)
748{
749 struct sock *sk = sock->sk;
4ec93edb 750
e71a4783 751 union {
4ec93edb
YH		 752 int val;
753 struct linger ling;
1da177e4
LT		 754 struct timeval tm;
755 } v;
4ec93edb 756
4d0392be 757 int lv = sizeof(int);
1da177e4 758 int len;
4ec93edb 759
e71a4783 760 if (get_user(len, optlen))
4ec93edb 761 return -EFAULT;
e71a4783 762 if (len < 0)
1da177e4 763 return -EINVAL;
4ec93edb 764
50fee1de 765 memset(&v, 0, sizeof(v));
df0bca04 766
2a91525c 767 switch (optname) {
e71a4783
SH		 768 case SO_DEBUG:
769 v.val = sock_flag(sk, SOCK_DBG);
770 break;
771
772 case SO_DONTROUTE:
773 v.val = sock_flag(sk, SOCK_LOCALROUTE);
774 break;
775
776 case SO_BROADCAST:
777 v.val = !!sock_flag(sk, SOCK_BROADCAST);
778 break;
779
780 case SO_SNDBUF:
781 v.val = sk->sk_sndbuf;
782 break;
783
784 case SO_RCVBUF:
785 v.val = sk->sk_rcvbuf;
786 break;
787
788 case SO_REUSEADDR:
789 v.val = sk->sk_reuse;
790 break;
791
792 case SO_KEEPALIVE:
793 v.val = !!sock_flag(sk, SOCK_KEEPOPEN);
794 break;
795
796 case SO_TYPE:
797 v.val = sk->sk_type;
798 break;
799
49c794e9
JE		 800 case SO_PROTOCOL:
801 v.val = sk->sk_protocol;
802 break;
803
0d6038ee
JE		 804 case SO_DOMAIN:
805 v.val = sk->sk_family;
806 break;
807
e71a4783
SH		 808 case SO_ERROR:
809 v.val = -sock_error(sk);
2a91525c 810 if (v.val == 0)
e71a4783
SH		 811 v.val = xchg(&sk->sk_err_soft, 0);
812 break;
813
814 case SO_OOBINLINE:
815 v.val = !!sock_flag(sk, SOCK_URGINLINE);
816 break;
817
818 case SO_NO_CHECK:
819 v.val = sk->sk_no_check;
820 break;
821
822 case SO_PRIORITY:
823 v.val = sk->sk_priority;
824 break;
825
826 case SO_LINGER:
827 lv = sizeof(v.ling);
828 v.ling.l_onoff = !!sock_flag(sk, SOCK_LINGER);
829 v.ling.l_linger = sk->sk_lingertime / HZ;
830 break;
831
832 case SO_BSDCOMPAT:
833 sock_warn_obsolete_bsdism("getsockopt");
834 break;
835
836 case SO_TIMESTAMP:
92f37fd2
ED		 837 v.val = sock_flag(sk, SOCK_RCVTSTAMP) &&
838 !sock_flag(sk, SOCK_RCVTSTAMPNS);
839 break;
840
841 case SO_TIMESTAMPNS:
842 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS);
e71a4783
SH		 843 break;
844
20d49473
PO		 845 case SO_TIMESTAMPING:
846 v.val = 0;
847 if (sock_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE))
848 v.val |= SOF_TIMESTAMPING_TX_HARDWARE;
849 if (sock_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE))
850 v.val |= SOF_TIMESTAMPING_TX_SOFTWARE;
851 if (sock_flag(sk, SOCK_TIMESTAMPING_RX_HARDWARE))
852 v.val |= SOF_TIMESTAMPING_RX_HARDWARE;
853 if (sock_flag(sk, SOCK_TIMESTAMPING_RX_SOFTWARE))
854 v.val |= SOF_TIMESTAMPING_RX_SOFTWARE;
855 if (sock_flag(sk, SOCK_TIMESTAMPING_SOFTWARE))
856 v.val |= SOF_TIMESTAMPING_SOFTWARE;
857 if (sock_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE))
858 v.val |= SOF_TIMESTAMPING_SYS_HARDWARE;
859 if (sock_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE))
860 v.val |= SOF_TIMESTAMPING_RAW_HARDWARE;
861 break;
862
e71a4783 863 case SO_RCVTIMEO:
2a91525c 864 lv = sizeof(struct timeval);
e71a4783
SH		 865 if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) {
866 v.tm.tv_sec = 0;
867 v.tm.tv_usec = 0;
868 } else {
869 v.tm.tv_sec = sk->sk_rcvtimeo / HZ;
870 v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ;
871 }
872 break;
873
874 case SO_SNDTIMEO:
2a91525c 875 lv = sizeof(struct timeval);
e71a4783
SH		 876 if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) {
877 v.tm.tv_sec = 0;
878 v.tm.tv_usec = 0;
879 } else {
880 v.tm.tv_sec = sk->sk_sndtimeo / HZ;
881 v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ;
882 }
883 break;
1da177e4 884
e71a4783
SH		 885 case SO_RCVLOWAT:
886 v.val = sk->sk_rcvlowat;
887 break;
1da177e4 888
e71a4783 889 case SO_SNDLOWAT:
2a91525c 890 v.val = 1;
e71a4783 891 break;
1da177e4 892
e71a4783
SH		 893 case SO_PASSCRED:
894 v.val = test_bit(SOCK_PASSCRED, &sock->flags) ? 1 : 0;
895 break;
1da177e4 896
e71a4783
SH		 897 case SO_PEERCRED:
898 if (len > sizeof(sk->sk_peercred))
899 len = sizeof(sk->sk_peercred);
900 if (copy_to_user(optval, &sk->sk_peercred, len))
901 return -EFAULT;
902 goto lenout;
1da177e4 903
e71a4783
SH		 904 case SO_PEERNAME:
905 {
906 char address[128];
907
908 if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2))
909 return -ENOTCONN;
910 if (lv < len)
911 return -EINVAL;
912 if (copy_to_user(optval, address, len))
913 return -EFAULT;
914 goto lenout;
915 }
1da177e4 916
e71a4783
SH		 917 /* Dubious BSD thing... Probably nobody even uses it, but
918 * the UNIX standard wants it for whatever reason... -DaveM
919 */
920 case SO_ACCEPTCONN:
921 v.val = sk->sk_state == TCP_LISTEN;
922 break;
1da177e4 923
e71a4783
SH		 924 case SO_PASSSEC:
925 v.val = test_bit(SOCK_PASSSEC, &sock->flags) ? 1 : 0;
926 break;
877ce7c1 927
e71a4783
SH		 928 case SO_PEERSEC:
929 return security_socket_getpeersec_stream(sock, optval, optlen, len);
1da177e4 930
4a19ec58
LAT		 931 case SO_MARK:
932 v.val = sk->sk_mark;
933 break;
934
3b885787
NH		 935 case SO_RXQ_OVFL:
936 v.val = !!sock_flag(sk, SOCK_RXQ_OVFL);
937 break;
938
e71a4783
SH		 939 default:
940 return -ENOPROTOOPT;
1da177e4 941 }
e71a4783 942
1da177e4
LT		 943 if (len > lv)
944 len = lv;
945 if (copy_to_user(optval, &v, len))
946 return -EFAULT;
947lenout:
4ec93edb
YH		 948 if (put_user(len, optlen))
949 return -EFAULT;
950 return 0;
1da177e4
LT		 951}
952
a5b5bb9a
IM		 953/*
954 * Initialize an sk_lock.
955 *
956 * (We also register the sk_lock with the lock validator.)
957 */
b6f99a21 958static inline void sock_lock_init(struct sock *sk)
a5b5bb9a 959{
ed07536e
PZ		 960 sock_lock_init_class_and_name(sk,
961 af_family_slock_key_strings[sk->sk_family],
962 af_family_slock_keys + sk->sk_family,
963 af_family_key_strings[sk->sk_family],
964 af_family_keys + sk->sk_family);
a5b5bb9a
IM		 965}
966
4dc6dc71
ED		 967/*
968 * Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet,
969 * even temporarly, because of RCU lookups. sk_node should also be left as is.
970 */
f1a6c4da
PE		 971static void sock_copy(struct sock *nsk, const struct sock *osk)
972{
973#ifdef CONFIG_SECURITY_NETWORK
974 void *sptr = nsk->sk_security;
975#endif
4dc6dc71 976 BUILD_BUG_ON(offsetof(struct sock, sk_copy_start) !=
e022f0b4
KK		 977 sizeof(osk->sk_node) + sizeof(osk->sk_refcnt) +
978 sizeof(osk->sk_tx_queue_mapping));
4dc6dc71
ED		 979 memcpy(&nsk->sk_copy_start, &osk->sk_copy_start,
980 osk->sk_prot->obj_size - offsetof(struct sock, sk_copy_start));
f1a6c4da
PE		 981#ifdef CONFIG_SECURITY_NETWORK
982 nsk->sk_security = sptr;
983 security_sk_clone(osk, nsk);
984#endif
985}
986
2e4afe7b
PE		 987static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority,
988 int family)
c308c1b2
PE		 989{
990 struct sock *sk;
991 struct kmem_cache *slab;
992
993 slab = prot->slab;
e912b114
ED		 994 if (slab != NULL) {
995 sk = kmem_cache_alloc(slab, priority & ~__GFP_ZERO);
996 if (!sk)
997 return sk;
998 if (priority & __GFP_ZERO) {
999 /*
1000 * caches using SLAB_DESTROY_BY_RCU should let
1001 * sk_node.next un-modified. Special care is taken
1002 * when initializing object to zero.
1003 */
1004 if (offsetof(struct sock, sk_node.next) != 0)
1005 memset(sk, 0, offsetof(struct sock, sk_node.next));
1006 memset(&sk->sk_node.pprev, 0,
1007 prot->obj_size - offsetof(struct sock,
1008 sk_node.pprev));
1009 }
1010 }
c308c1b2
PE		 1011 else
1012 sk = kmalloc(prot->obj_size, priority);
1013
2e4afe7b 1014 if (sk != NULL) {
a98b65a3
VN		 1015 kmemcheck_annotate_bitfield(sk, flags);
1016
2e4afe7b
PE		 1017 if (security_sk_alloc(sk, family, priority))
1018 goto out_free;
1019
1020 if (!try_module_get(prot->owner))
1021 goto out_free_sec;
e022f0b4 1022 sk_tx_queue_clear(sk);
2e4afe7b
PE		 1023 }
1024
c308c1b2 1025 return sk;
2e4afe7b
PE		 1026
1027out_free_sec:
1028 security_sk_free(sk);
1029out_free:
1030 if (slab != NULL)
1031 kmem_cache_free(slab, sk);
1032 else
1033 kfree(sk);
1034 return NULL;
c308c1b2
PE		 1035}
1036
1037static void sk_prot_free(struct proto *prot, struct sock *sk)
1038{
1039 struct kmem_cache *slab;
2e4afe7b 1040 struct module *owner;
c308c1b2 1041
2e4afe7b 1042 owner = prot->owner;
c308c1b2 1043 slab = prot->slab;
2e4afe7b
PE		 1044
1045 security_sk_free(sk);
c308c1b2
PE		 1046 if (slab != NULL)
1047 kmem_cache_free(slab, sk);
1048 else
1049 kfree(sk);
2e4afe7b 1050 module_put(owner);
c308c1b2
PE		 1051}
1052
1da177e4
LT		 1053/**
1054 * sk_alloc - All socket objects are allocated here
c4ea43c5 1055 * @net: the applicable net namespace
4dc3b16b
PP		 1056 * @family: protocol family
1057 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1058 * @prot: struct proto associated with this new sock instance
1da177e4 1059 */
1b8d7ae4 1060struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
6257ff21 1061 struct proto *prot)
1da177e4 1062{
c308c1b2 1063 struct sock *sk;
1da177e4 1064
154adbc8 1065 sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family);
1da177e4 1066 if (sk) {
154adbc8
PE		 1067 sk->sk_family = family;
1068 /*
1069 * See comment in struct sock definition to understand
1070 * why we need sk_prot_creator -acme
1071 */
1072 sk->sk_prot = sk->sk_prot_creator = prot;
1073 sock_lock_init(sk);
3b1e0a65 1074 sock_net_set(sk, get_net(net));
d66ee058 1075 atomic_set(&sk->sk_wmem_alloc, 1);
1da177e4 1076 }
a79af59e 1077
2e4afe7b 1078 return sk;
1da177e4 1079}
2a91525c 1080EXPORT_SYMBOL(sk_alloc);
1da177e4 1081
2b85a34e 1082static void __sk_free(struct sock *sk)
1da177e4
LT		 1083{
1084 struct sk_filter *filter;
1da177e4
LT		 1085
1086 if (sk->sk_destruct)
1087 sk->sk_destruct(sk);
1088
a898def2
PM		 1089 filter = rcu_dereference_check(sk->sk_filter,
1090 atomic_read(&sk->sk_wmem_alloc) == 0);
1da177e4 1091 if (filter) {
309dd5fc 1092 sk_filter_uncharge(sk, filter);
fda9ef5d 1093 rcu_assign_pointer(sk->sk_filter, NULL);
1da177e4
LT		 1094 }
1095
20d49473
PO		 1096 sock_disable_timestamp(sk, SOCK_TIMESTAMP);
1097 sock_disable_timestamp(sk, SOCK_TIMESTAMPING_RX_SOFTWARE);
1da177e4
LT		 1098
1099 if (atomic_read(&sk->sk_omem_alloc))
1100 printk(KERN_DEBUG "%s: optmem leakage (%d bytes) detected.\n",
0dc47877 1101 __func__, atomic_read(&sk->sk_omem_alloc));
1da177e4 1102
3b1e0a65 1103 put_net(sock_net(sk));
c308c1b2 1104 sk_prot_free(sk->sk_prot_creator, sk);
1da177e4 1105}
2b85a34e
ED		 1106
1107void sk_free(struct sock *sk)
1108{
1109 /*
1110 * We substract one from sk_wmem_alloc and can know if
1111 * some packets are still in some tx queue.
1112 * If not null, sock_wfree() will call __sk_free(sk) later
1113 */
1114 if (atomic_dec_and_test(&sk->sk_wmem_alloc))
1115 __sk_free(sk);
1116}
2a91525c 1117EXPORT_SYMBOL(sk_free);
1da177e4 1118
edf02087
DL		 1119/*
1120 * Last sock_put should drop referrence to sk->sk_net. It has already
1121 * been dropped in sk_change_net. Taking referrence to stopping namespace
1122 * is not an option.
1123 * Take referrence to a socket to remove it from hash _alive_ and after that
1124 * destroy it in the context of init_net.
1125 */
1126void sk_release_kernel(struct sock *sk)
1127{
1128 if (sk == NULL || sk->sk_socket == NULL)
1129 return;
1130
1131 sock_hold(sk);
1132 sock_release(sk->sk_socket);
65a18ec5 1133 release_net(sock_net(sk));
3b1e0a65 1134 sock_net_set(sk, get_net(&init_net));
edf02087
DL		 1135 sock_put(sk);
1136}
45af1754 1137EXPORT_SYMBOL(sk_release_kernel);
edf02087 1138
dd0fc66f 1139struct sock *sk_clone(const struct sock *sk, const gfp_t priority)
87d11ceb 1140{
8fd1d178 1141 struct sock *newsk;
87d11ceb 1142
8fd1d178 1143 newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family);
87d11ceb
ACM		 1144 if (newsk != NULL) {
1145 struct sk_filter *filter;
1146
892c141e 1147 sock_copy(newsk, sk);
87d11ceb
ACM		 1148
1149 /* SANITY */
3b1e0a65 1150 get_net(sock_net(newsk));
87d11ceb
ACM		 1151 sk_node_init(&newsk->sk_node);
1152 sock_lock_init(newsk);
1153 bh_lock_sock(newsk);
fa438ccf 1154 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL;
8eae939f 1155 newsk->sk_backlog.len = 0;
87d11ceb
ACM		 1156
1157 atomic_set(&newsk->sk_rmem_alloc, 0);
2b85a34e
ED		 1158 /*
1159 * sk_wmem_alloc set to one (see sk_free() and sock_wfree())
1160 */
1161 atomic_set(&newsk->sk_wmem_alloc, 1);
87d11ceb
ACM		 1162 atomic_set(&newsk->sk_omem_alloc, 0);
1163 skb_queue_head_init(&newsk->sk_receive_queue);
1164 skb_queue_head_init(&newsk->sk_write_queue);
97fc2f08
CL		 1165#ifdef CONFIG_NET_DMA
1166 skb_queue_head_init(&newsk->sk_async_wait_queue);
1167#endif
87d11ceb 1168
b6c6712a 1169 spin_lock_init(&newsk->sk_dst_lock);
87d11ceb 1170 rwlock_init(&newsk->sk_callback_lock);
443aef0e
PZ		 1171 lockdep_set_class_and_name(&newsk->sk_callback_lock,
1172 af_callback_keys + newsk->sk_family,
1173 af_family_clock_key_strings[newsk->sk_family]);
87d11ceb
ACM		 1174
1175 newsk->sk_dst_cache = NULL;
1176 newsk->sk_wmem_queued = 0;
1177 newsk->sk_forward_alloc = 0;
1178 newsk->sk_send_head = NULL;
87d11ceb
ACM		 1179 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
1180
1181 sock_reset_flag(newsk, SOCK_DONE);
1182 skb_queue_head_init(&newsk->sk_error_queue);
1183
1184 filter = newsk->sk_filter;
1185 if (filter != NULL)
1186 sk_filter_charge(newsk, filter);
1187
1188 if (unlikely(xfrm_sk_clone_policy(newsk))) {
1189 /* It is still raw copy of parent, so invalidate
1190 * destructor and make plain sk_free() */
1191 newsk->sk_destruct = NULL;
1192 sk_free(newsk);
1193 newsk = NULL;
1194 goto out;
1195 }
1196
1197 newsk->sk_err = 0;
1198 newsk->sk_priority = 0;
4dc6dc71
ED		 1199 /*
1200 * Before updating sk_refcnt, we must commit prior changes to memory
1201 * (Documentation/RCU/rculist_nulls.txt for details)
1202 */
1203 smp_wmb();
87d11ceb
ACM		 1204 atomic_set(&newsk->sk_refcnt, 2);
1205
1206 /*
1207 * Increment the counter in the same struct proto as the master
1208 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
1209 * is the same as sk->sk_prot->socks, as this field was copied
1210 * with memcpy).
1211 *
1212 * This _changes_ the previous behaviour, where
1213 * tcp_create_openreq_child always was incrementing the
1214 * equivalent to tcp_prot->socks (inet_sock_nr), so this have
1215 * to be taken into account in all callers. -acme
1216 */
1217 sk_refcnt_debug_inc(newsk);
972692e0 1218 sk_set_socket(newsk, NULL);
43815482 1219 newsk->sk_wq = NULL;
87d11ceb
ACM		 1220
1221 if (newsk->sk_prot->sockets_allocated)
1748376b 1222 percpu_counter_inc(newsk->sk_prot->sockets_allocated);
704da560
OP		 1223
1224 if (sock_flag(newsk, SOCK_TIMESTAMP) ||
1225 sock_flag(newsk, SOCK_TIMESTAMPING_RX_SOFTWARE))
1226 net_enable_timestamp();
87d11ceb
ACM		 1227 }
1228out:
1229 return newsk;
1230}
87d11ceb
ACM		 1231EXPORT_SYMBOL_GPL(sk_clone);
1232
9958089a
AK		 1233void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
1234{
1235 __sk_dst_set(sk, dst);
1236 sk->sk_route_caps = dst->dev->features;
1237 if (sk->sk_route_caps & NETIF_F_GSO)
4fcd6b99 1238 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE;
a465419b 1239 sk->sk_route_caps &= ~sk->sk_route_nocaps;
9958089a 1240 if (sk_can_gso(sk)) {
82cc1a7a 1241 if (dst->header_len) {
9958089a 1242 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
82cc1a7a 1243 } else {
9958089a 1244 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
82cc1a7a
PWJ		 1245 sk->sk_gso_max_size = dst->dev->gso_max_size;
1246 }
9958089a
AK		 1247 }
1248}
1249EXPORT_SYMBOL_GPL(sk_setup_caps);
1250
1da177e4
LT		 1251void __init sk_init(void)
1252{
4481374c 1253 if (totalram_pages <= 4096) {
1da177e4
LT		 1254 sysctl_wmem_max = 32767;
1255 sysctl_rmem_max = 32767;
1256 sysctl_wmem_default = 32767;
1257 sysctl_rmem_default = 32767;
4481374c 1258 } else if (totalram_pages >= 131072) {
1da177e4
LT		 1259 sysctl_wmem_max = 131071;
1260 sysctl_rmem_max = 131071;
1261 }
1262}
1263
1264/*
1265 * Simple resource managers for sockets.
1266 */
1267
1268
4ec93edb
YH		 1269/*
1270 * Write buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1271 */
1272void sock_wfree(struct sk_buff *skb)
1273{
1274 struct sock *sk = skb->sk;
d99927f4 1275 unsigned int len = skb->truesize;
1da177e4 1276
d99927f4
ED		 1277 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) {
1278 /*
1279 * Keep a reference on sk_wmem_alloc, this will be released
1280 * after sk_write_space() call
1281 */
1282 atomic_sub(len - 1, &sk->sk_wmem_alloc);
1da177e4 1283 sk->sk_write_space(sk);
d99927f4
ED		 1284 len = 1;
1285 }
2b85a34e 1286 /*
d99927f4
ED		 1287 * if sk_wmem_alloc reaches 0, we must finish what sk_free()
1288 * could not do because of in-flight packets
2b85a34e 1289 */
d99927f4 1290 if (atomic_sub_and_test(len, &sk->sk_wmem_alloc))
2b85a34e 1291 __sk_free(sk);
1da177e4 1292}
2a91525c 1293EXPORT_SYMBOL(sock_wfree);
1da177e4 1294
4ec93edb
YH		 1295/*
1296 * Read buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1297 */
1298void sock_rfree(struct sk_buff *skb)
1299{
1300 struct sock *sk = skb->sk;
1301
1302 atomic_sub(skb->truesize, &sk->sk_rmem_alloc);
3ab224be 1303 sk_mem_uncharge(skb->sk, skb->truesize);
1da177e4 1304}
2a91525c 1305EXPORT_SYMBOL(sock_rfree);
1da177e4
LT		 1306
1307
1308int sock_i_uid(struct sock *sk)
1309{
1310 int uid;
1311
1312 read_lock(&sk->sk_callback_lock);
1313 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : 0;
1314 read_unlock(&sk->sk_callback_lock);
1315 return uid;
1316}
2a91525c 1317EXPORT_SYMBOL(sock_i_uid);
1da177e4
LT		 1318
1319unsigned long sock_i_ino(struct sock *sk)
1320{
1321 unsigned long ino;
1322
1323 read_lock(&sk->sk_callback_lock);
1324 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
1325 read_unlock(&sk->sk_callback_lock);
1326 return ino;
1327}
2a91525c 1328EXPORT_SYMBOL(sock_i_ino);
1da177e4
LT		 1329
1330/*
1331 * Allocate a skb from the socket's send buffer.
1332 */
86a76caf 1333struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
dd0fc66f 1334 gfp_t priority)
1da177e4
LT		 1335{
1336 if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
2a91525c 1337 struct sk_buff *skb = alloc_skb(size, priority);
1da177e4
LT		 1338 if (skb) {
1339 skb_set_owner_w(skb, sk);
1340 return skb;
1341 }
1342 }
1343 return NULL;
1344}
2a91525c 1345EXPORT_SYMBOL(sock_wmalloc);
1da177e4
LT		 1346
1347/*
1348 * Allocate a skb from the socket's receive buffer.
4ec93edb 1349 */
86a76caf 1350struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force,
dd0fc66f 1351 gfp_t priority)
1da177e4
LT		 1352{
1353 if (force || atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) {
1354 struct sk_buff *skb = alloc_skb(size, priority);
1355 if (skb) {
1356 skb_set_owner_r(skb, sk);
1357 return skb;
1358 }
1359 }
1360 return NULL;
1361}
1362
4ec93edb 1363/*
1da177e4 1364 * Allocate a memory block from the socket's option memory buffer.
4ec93edb 1365 */
dd0fc66f 1366void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
1da177e4
LT		 1367{
1368 if ((unsigned)size <= sysctl_optmem_max &&
1369 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) {
1370 void *mem;
1371 /* First do the add, to avoid the race if kmalloc
4ec93edb 1372 * might sleep.
1da177e4
LT		 1373 */
1374 atomic_add(size, &sk->sk_omem_alloc);
1375 mem = kmalloc(size, priority);
1376 if (mem)
1377 return mem;
1378 atomic_sub(size, &sk->sk_omem_alloc);
1379 }
1380 return NULL;
1381}
2a91525c 1382EXPORT_SYMBOL(sock_kmalloc);
1da177e4
LT		 1383
1384/*
1385 * Free an option memory block.
1386 */
1387void sock_kfree_s(struct sock *sk, void *mem, int size)
1388{
1389 kfree(mem);
1390 atomic_sub(size, &sk->sk_omem_alloc);
1391}
2a91525c 1392EXPORT_SYMBOL(sock_kfree_s);
1da177e4
LT		 1393
1394/* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
1395 I think, these locks should be removed for datagram sockets.
1396 */
2a91525c 1397static long sock_wait_for_wmem(struct sock *sk, long timeo)
1da177e4
LT		 1398{
1399 DEFINE_WAIT(wait);
1400
1401 clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1402 for (;;) {
1403 if (!timeo)
1404 break;
1405 if (signal_pending(current))
1406 break;
1407 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
aa395145 1408 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1da177e4
LT		 1409 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf)
1410 break;
1411 if (sk->sk_shutdown & SEND_SHUTDOWN)
1412 break;
1413 if (sk->sk_err)
1414 break;
1415 timeo = schedule_timeout(timeo);
1416 }
aa395145 1417 finish_wait(sk_sleep(sk), &wait);
1da177e4
LT		 1418 return timeo;
1419}
1420
1421
1422/*
1423 * Generic send/receive buffer handlers
1424 */
1425
4cc7f68d
HX		 1426struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len,
1427 unsigned long data_len, int noblock,
1428 int *errcode)
1da177e4
LT		 1429{
1430 struct sk_buff *skb;
7d877f3b 1431 gfp_t gfp_mask;
1da177e4
LT		 1432 long timeo;
1433 int err;
1434
1435 gfp_mask = sk->sk_allocation;
1436 if (gfp_mask & __GFP_WAIT)
1437 gfp_mask |= __GFP_REPEAT;
1438
1439 timeo = sock_sndtimeo(sk, noblock);
1440 while (1) {
1441 err = sock_error(sk);
1442 if (err != 0)
1443 goto failure;
1444
1445 err = -EPIPE;
1446 if (sk->sk_shutdown & SEND_SHUTDOWN)
1447 goto failure;
1448
1449 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
db38c179 1450 skb = alloc_skb(header_len, gfp_mask);
1da177e4
LT		 1451 if (skb) {
1452 int npages;
1453 int i;
1454
1455 /* No pages, we're done... */
1456 if (!data_len)
1457 break;
1458
1459 npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
1460 skb->truesize += data_len;
1461 skb_shinfo(skb)->nr_frags = npages;
1462 for (i = 0; i < npages; i++) {
1463 struct page *page;
1464 skb_frag_t *frag;
1465
1466 page = alloc_pages(sk->sk_allocation, 0);
1467 if (!page) {
1468 err = -ENOBUFS;
1469 skb_shinfo(skb)->nr_frags = i;
1470 kfree_skb(skb);
1471 goto failure;
1472 }
1473
1474 frag = &skb_shinfo(skb)->frags[i];
1475 frag->page = page;
1476 frag->page_offset = 0;
1477 frag->size = (data_len >= PAGE_SIZE ?
1478 PAGE_SIZE :
1479 data_len);
1480 data_len -= PAGE_SIZE;
1481 }
1482
1483 /* Full success... */
1484 break;
1485 }
1486 err = -ENOBUFS;
1487 goto failure;
1488 }
1489 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1490 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1491 err = -EAGAIN;
1492 if (!timeo)
1493 goto failure;
1494 if (signal_pending(current))
1495 goto interrupted;
1496 timeo = sock_wait_for_wmem(sk, timeo);
1497 }
1498
1499 skb_set_owner_w(skb, sk);
1500 return skb;
1501
1502interrupted:
1503 err = sock_intr_errno(timeo);
1504failure:
1505 *errcode = err;
1506 return NULL;
1507}
4cc7f68d 1508EXPORT_SYMBOL(sock_alloc_send_pskb);
1da177e4 1509
4ec93edb 1510struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
1da177e4
LT		 1511 int noblock, int *errcode)
1512{
1513 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode);
1514}
2a91525c 1515EXPORT_SYMBOL(sock_alloc_send_skb);
1da177e4
LT		 1516
1517static void __lock_sock(struct sock *sk)
1518{
1519 DEFINE_WAIT(wait);
1520
e71a4783 1521 for (;;) {
1da177e4
LT		 1522 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
1523 TASK_UNINTERRUPTIBLE);
1524 spin_unlock_bh(&sk->sk_lock.slock);
1525 schedule();
1526 spin_lock_bh(&sk->sk_lock.slock);
e71a4783 1527 if (!sock_owned_by_user(sk))
1da177e4
LT		 1528 break;
1529 }
1530 finish_wait(&sk->sk_lock.wq, &wait);
1531}
1532
1533static void __release_sock(struct sock *sk)
1534{
1535 struct sk_buff *skb = sk->sk_backlog.head;
1536
1537 do {
1538 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
1539 bh_unlock_sock(sk);
1540
1541 do {
1542 struct sk_buff *next = skb->next;
1543
7fee226a 1544 WARN_ON_ONCE(skb_dst_is_noref(skb));
1da177e4 1545 skb->next = NULL;
c57943a1 1546 sk_backlog_rcv(sk, skb);
1da177e4
LT		 1547
1548 /*
1549 * We are in process context here with softirqs
1550 * disabled, use cond_resched_softirq() to preempt.
1551 * This is safe to do because we've taken the backlog
1552 * queue private:
1553 */
1554 cond_resched_softirq();
1555
1556 skb = next;
1557 } while (skb != NULL);
1558
1559 bh_lock_sock(sk);
e71a4783 1560 } while ((skb = sk->sk_backlog.head) != NULL);
8eae939f
ZY		 1561
1562 /*
1563 * Doing the zeroing here guarantee we can not loop forever
1564 * while a wild producer attempts to flood us.
1565 */
1566 sk->sk_backlog.len = 0;
1da177e4
LT		 1567}
1568
1569/**
1570 * sk_wait_data - wait for data to arrive at sk_receive_queue
4dc3b16b
PP		 1571 * @sk: sock to wait on
1572 * @timeo: for how long
1da177e4
LT		 1573 *
1574 * Now socket state including sk->sk_err is changed only under lock,
1575 * hence we may omit checks after joining wait queue.
1576 * We check receive queue before schedule() only as optimization;
1577 * it is very likely that release_sock() added new data.
1578 */
1579int sk_wait_data(struct sock *sk, long *timeo)
1580{
1581 int rc;
1582 DEFINE_WAIT(wait);
1583
aa395145 1584 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1da177e4
LT		 1585 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1586 rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue));
1587 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
aa395145 1588 finish_wait(sk_sleep(sk), &wait);
1da177e4
LT		 1589 return rc;
1590}
1da177e4
LT		 1591EXPORT_SYMBOL(sk_wait_data);
1592
3ab224be
HA		 1593/**
1594 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated
1595 * @sk: socket
1596 * @size: memory size to allocate
1597 * @kind: allocation type
1598 *
1599 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means
1600 * rmem allocation. This function assumes that protocols which have
1601 * memory_pressure use sk_wmem_queued as write buffer accounting.
1602 */
1603int __sk_mem_schedule(struct sock *sk, int size, int kind)
1604{
1605 struct proto *prot = sk->sk_prot;
1606 int amt = sk_mem_pages(size);
1607 int allocated;
1608
1609 sk->sk_forward_alloc += amt * SK_MEM_QUANTUM;
1610 allocated = atomic_add_return(amt, prot->memory_allocated);
1611
1612 /* Under limit. */
1613 if (allocated <= prot->sysctl_mem[0]) {
1614 if (prot->memory_pressure && *prot->memory_pressure)
1615 *prot->memory_pressure = 0;
1616 return 1;
1617 }
1618
1619 /* Under pressure. */
1620 if (allocated > prot->sysctl_mem[1])
1621 if (prot->enter_memory_pressure)
5c52ba17 1622 prot->enter_memory_pressure(sk);
3ab224be
HA		 1623
1624 /* Over hard limit. */
1625 if (allocated > prot->sysctl_mem[2])
1626 goto suppress_allocation;
1627
1628 /* guarantee minimum buffer size under pressure */
1629 if (kind == SK_MEM_RECV) {
1630 if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0])
1631 return 1;
1632 } else { /* SK_MEM_SEND */
1633 if (sk->sk_type == SOCK_STREAM) {
1634 if (sk->sk_wmem_queued < prot->sysctl_wmem[0])
1635 return 1;
1636 } else if (atomic_read(&sk->sk_wmem_alloc) <
1637 prot->sysctl_wmem[0])
1638 return 1;
1639 }
1640
1641 if (prot->memory_pressure) {
1748376b
ED		 1642 int alloc;
1643
1644 if (!*prot->memory_pressure)
1645 return 1;
1646 alloc = percpu_counter_read_positive(prot->sockets_allocated);
1647 if (prot->sysctl_mem[2] > alloc *
3ab224be
HA		 1648 sk_mem_pages(sk->sk_wmem_queued +
1649 atomic_read(&sk->sk_rmem_alloc) +
1650 sk->sk_forward_alloc))
1651 return 1;
1652 }
1653
1654suppress_allocation:
1655
1656 if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) {
1657 sk_stream_moderate_sndbuf(sk);
1658
1659 /* Fail only if socket is _under_ its sndbuf.
1660 * In this case we cannot block, so that we have to fail.
1661 */
1662 if (sk->sk_wmem_queued + size >= sk->sk_sndbuf)
1663 return 1;
1664 }
1665
1666 /* Alas. Undo changes. */
1667 sk->sk_forward_alloc -= amt * SK_MEM_QUANTUM;
1668 atomic_sub(amt, prot->memory_allocated);
1669 return 0;
1670}
3ab224be
HA		 1671EXPORT_SYMBOL(__sk_mem_schedule);
1672
1673/**
1674 * __sk_reclaim - reclaim memory_allocated
1675 * @sk: socket
1676 */
1677void __sk_mem_reclaim(struct sock *sk)
1678{
1679 struct proto *prot = sk->sk_prot;
1680
680a5a50 1681 atomic_sub(sk->sk_forward_alloc >> SK_MEM_QUANTUM_SHIFT,
3ab224be
HA		 1682 prot->memory_allocated);
1683 sk->sk_forward_alloc &= SK_MEM_QUANTUM - 1;
1684
1685 if (prot->memory_pressure && *prot->memory_pressure &&
1686 (atomic_read(prot->memory_allocated) < prot->sysctl_mem[0]))
1687 *prot->memory_pressure = 0;
1688}
3ab224be
HA		 1689EXPORT_SYMBOL(__sk_mem_reclaim);
1690
1691
1da177e4
LT		 1692/*
1693 * Set of default routines for initialising struct proto_ops when
1694 * the protocol does not support a particular function. In certain
1695 * cases where it makes no sense for a protocol to have a "do nothing"
1696 * function, some default processing is provided.
1697 */
1698
1699int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
1700{
1701 return -EOPNOTSUPP;
1702}
2a91525c 1703EXPORT_SYMBOL(sock_no_bind);
1da177e4 1704
4ec93edb 1705int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 1706 int len, int flags)
1707{
1708 return -EOPNOTSUPP;
1709}
2a91525c 1710EXPORT_SYMBOL(sock_no_connect);
1da177e4
LT		 1711
1712int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
1713{
1714 return -EOPNOTSUPP;
1715}
2a91525c 1716EXPORT_SYMBOL(sock_no_socketpair);
1da177e4
LT		 1717
1718int sock_no_accept(struct socket *sock, struct socket *newsock, int flags)
1719{
1720 return -EOPNOTSUPP;
1721}
2a91525c 1722EXPORT_SYMBOL(sock_no_accept);
1da177e4 1723
4ec93edb 1724int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 1725 int *len, int peer)
1726{
1727 return -EOPNOTSUPP;
1728}
2a91525c 1729EXPORT_SYMBOL(sock_no_getname);
1da177e4 1730
2a91525c 1731unsigned int sock_no_poll(struct file *file, struct socket *sock, poll_table *pt)
1da177e4
LT		 1732{
1733 return 0;
1734}
2a91525c 1735EXPORT_SYMBOL(sock_no_poll);
1da177e4
LT		 1736
1737int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1738{
1739 return -EOPNOTSUPP;
1740}
2a91525c 1741EXPORT_SYMBOL(sock_no_ioctl);
1da177e4
LT		 1742
1743int sock_no_listen(struct socket *sock, int backlog)
1744{
1745 return -EOPNOTSUPP;
1746}
2a91525c 1747EXPORT_SYMBOL(sock_no_listen);
1da177e4
LT		 1748
1749int sock_no_shutdown(struct socket *sock, int how)
1750{
1751 return -EOPNOTSUPP;
1752}
2a91525c 1753EXPORT_SYMBOL(sock_no_shutdown);
1da177e4
LT		 1754
1755int sock_no_setsockopt(struct socket *sock, int level, int optname,
b7058842 1756 char __user *optval, unsigned int optlen)
1da177e4
LT		 1757{
1758 return -EOPNOTSUPP;
1759}
2a91525c 1760EXPORT_SYMBOL(sock_no_setsockopt);
1da177e4
LT		 1761
1762int sock_no_getsockopt(struct socket *sock, int level, int optname,
1763 char __user *optval, int __user *optlen)
1764{
1765 return -EOPNOTSUPP;
1766}
2a91525c 1767EXPORT_SYMBOL(sock_no_getsockopt);
1da177e4
LT		 1768
1769int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
1770 size_t len)
1771{
1772 return -EOPNOTSUPP;
1773}
2a91525c 1774EXPORT_SYMBOL(sock_no_sendmsg);
1da177e4
LT		 1775
1776int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
1777 size_t len, int flags)
1778{
1779 return -EOPNOTSUPP;
1780}
2a91525c 1781EXPORT_SYMBOL(sock_no_recvmsg);
1da177e4
LT		 1782
1783int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
1784{
1785 /* Mirror missing mmap method error code */
1786 return -ENODEV;
1787}
2a91525c 1788EXPORT_SYMBOL(sock_no_mmap);
1da177e4
LT		 1789
1790ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
1791{
1792 ssize_t res;
1793 struct msghdr msg = {.msg_flags = flags};
1794 struct kvec iov;
1795 char *kaddr = kmap(page);
1796 iov.iov_base = kaddr + offset;
1797 iov.iov_len = size;
1798 res = kernel_sendmsg(sock, &msg, &iov, 1, size);
1799 kunmap(page);
1800 return res;
1801}
2a91525c 1802EXPORT_SYMBOL(sock_no_sendpage);
1da177e4
LT		 1803
1804/*
1805 * Default Socket Callbacks
1806 */
1807
1808static void sock_def_wakeup(struct sock *sk)
1809{
43815482
ED		 1810 struct socket_wq *wq;
1811
1812 rcu_read_lock();
1813 wq = rcu_dereference(sk->sk_wq);
1814 if (wq_has_sleeper(wq))
1815 wake_up_interruptible_all(&wq->wait);
1816 rcu_read_unlock();
1da177e4
LT		 1817}
1818
1819static void sock_def_error_report(struct sock *sk)
1820{
43815482
ED		 1821 struct socket_wq *wq;
1822
1823 rcu_read_lock();
1824 wq = rcu_dereference(sk->sk_wq);
1825 if (wq_has_sleeper(wq))
1826 wake_up_interruptible_poll(&wq->wait, POLLERR);
8d8ad9d7 1827 sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR);
43815482 1828 rcu_read_unlock();
1da177e4
LT		 1829}
1830
1831static void sock_def_readable(struct sock *sk, int len)
1832{
43815482
ED		 1833 struct socket_wq *wq;
1834
1835 rcu_read_lock();
1836 wq = rcu_dereference(sk->sk_wq);
1837 if (wq_has_sleeper(wq))
1838 wake_up_interruptible_sync_poll(&wq->wait, POLLIN |
37e5540b 1839 POLLRDNORM | POLLRDBAND);
8d8ad9d7 1840 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
43815482 1841 rcu_read_unlock();
1da177e4
LT		 1842}
1843
1844static void sock_def_write_space(struct sock *sk)
1845{
43815482
ED		 1846 struct socket_wq *wq;
1847
1848 rcu_read_lock();
1da177e4
LT		 1849
1850 /* Do not wake up a writer until he can make "significant"
1851 * progress. --DaveM
1852 */
e71a4783 1853 if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) {
43815482
ED		 1854 wq = rcu_dereference(sk->sk_wq);
1855 if (wq_has_sleeper(wq))
1856 wake_up_interruptible_sync_poll(&wq->wait, POLLOUT |
37e5540b 1857 POLLWRNORM | POLLWRBAND);
1da177e4
LT		 1858
1859 /* Should agree with poll, otherwise some programs break */
1860 if (sock_writeable(sk))
8d8ad9d7 1861 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
1da177e4
LT		 1862 }
1863
43815482 1864 rcu_read_unlock();
1da177e4
LT		 1865}
1866
1867static void sock_def_destruct(struct sock *sk)
1868{
a51482bd 1869 kfree(sk->sk_protinfo);
1da177e4
LT		 1870}
1871
1872void sk_send_sigurg(struct sock *sk)
1873{
1874 if (sk->sk_socket && sk->sk_socket->file)
1875 if (send_sigurg(&sk->sk_socket->file->f_owner))
8d8ad9d7 1876 sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI);
1da177e4 1877}
2a91525c 1878EXPORT_SYMBOL(sk_send_sigurg);
1da177e4
LT		 1879
1880void sk_reset_timer(struct sock *sk, struct timer_list* timer,
1881 unsigned long expires)
1882{
1883 if (!mod_timer(timer, expires))
1884 sock_hold(sk);
1885}
1da177e4
LT		 1886EXPORT_SYMBOL(sk_reset_timer);
1887
1888void sk_stop_timer(struct sock *sk, struct timer_list* timer)
1889{
1890 if (timer_pending(timer) && del_timer(timer))
1891 __sock_put(sk);
1892}
1da177e4
LT		 1893EXPORT_SYMBOL(sk_stop_timer);
1894
1895void sock_init_data(struct socket *sock, struct sock *sk)
1896{
1897 skb_queue_head_init(&sk->sk_receive_queue);
1898 skb_queue_head_init(&sk->sk_write_queue);
1899 skb_queue_head_init(&sk->sk_error_queue);
97fc2f08
CL		 1900#ifdef CONFIG_NET_DMA
1901 skb_queue_head_init(&sk->sk_async_wait_queue);
1902#endif
1da177e4
LT		 1903
1904 sk->sk_send_head = NULL;
1905
1906 init_timer(&sk->sk_timer);
4ec93edb 1907
1da177e4
LT		 1908 sk->sk_allocation = GFP_KERNEL;
1909 sk->sk_rcvbuf = sysctl_rmem_default;
1910 sk->sk_sndbuf = sysctl_wmem_default;
1911 sk->sk_state = TCP_CLOSE;
972692e0 1912 sk_set_socket(sk, sock);
1da177e4
LT		 1913
1914 sock_set_flag(sk, SOCK_ZAPPED);
1915
e71a4783 1916 if (sock) {
1da177e4 1917 sk->sk_type = sock->type;
43815482 1918 sk->sk_wq = sock->wq;
1da177e4
LT		 1919 sock->sk = sk;
1920 } else
43815482 1921 sk->sk_wq = NULL;
1da177e4 1922
b6c6712a 1923 spin_lock_init(&sk->sk_dst_lock);
1da177e4 1924 rwlock_init(&sk->sk_callback_lock);
443aef0e
PZ		 1925 lockdep_set_class_and_name(&sk->sk_callback_lock,
1926 af_callback_keys + sk->sk_family,
1927 af_family_clock_key_strings[sk->sk_family]);
1da177e4
LT		 1928
1929 sk->sk_state_change = sock_def_wakeup;
1930 sk->sk_data_ready = sock_def_readable;
1931 sk->sk_write_space = sock_def_write_space;
1932 sk->sk_error_report = sock_def_error_report;
1933 sk->sk_destruct = sock_def_destruct;
1934
1935 sk->sk_sndmsg_page = NULL;
1936 sk->sk_sndmsg_off = 0;
1937
1938 sk->sk_peercred.pid = 0;
1939 sk->sk_peercred.uid = -1;
1940 sk->sk_peercred.gid = -1;
1941 sk->sk_write_pending = 0;
1942 sk->sk_rcvlowat = 1;
1943 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
1944 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
1945
f37f0afb 1946 sk->sk_stamp = ktime_set(-1L, 0);
1da177e4 1947
4dc6dc71
ED		 1948 /*
1949 * Before updating sk_refcnt, we must commit prior changes to memory
1950 * (Documentation/RCU/rculist_nulls.txt for details)
1951 */
1952 smp_wmb();
1da177e4 1953 atomic_set(&sk->sk_refcnt, 1);
33c732c3 1954 atomic_set(&sk->sk_drops, 0);
1da177e4 1955}
2a91525c 1956EXPORT_SYMBOL(sock_init_data);
1da177e4 1957
b5606c2d 1958void lock_sock_nested(struct sock *sk, int subclass)
1da177e4
LT		 1959{
1960 might_sleep();
a5b5bb9a 1961 spin_lock_bh(&sk->sk_lock.slock);
d2e9117c 1962 if (sk->sk_lock.owned)
1da177e4 1963 __lock_sock(sk);
d2e9117c 1964 sk->sk_lock.owned = 1;
a5b5bb9a
IM		 1965 spin_unlock(&sk->sk_lock.slock);
1966 /*
1967 * The sk_lock has mutex_lock() semantics here:
1968 */
fcc70d5f 1969 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
a5b5bb9a 1970 local_bh_enable();
1da177e4 1971}
fcc70d5f 1972EXPORT_SYMBOL(lock_sock_nested);
1da177e4 1973
b5606c2d 1974void release_sock(struct sock *sk)
1da177e4 1975{
a5b5bb9a
IM		 1976 /*
1977 * The sk_lock has mutex_unlock() semantics:
1978 */
1979 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
1980
1981 spin_lock_bh(&sk->sk_lock.slock);
1da177e4
LT		 1982 if (sk->sk_backlog.tail)
1983 __release_sock(sk);
d2e9117c 1984 sk->sk_lock.owned = 0;
a5b5bb9a
IM		 1985 if (waitqueue_active(&sk->sk_lock.wq))
1986 wake_up(&sk->sk_lock.wq);
1987 spin_unlock_bh(&sk->sk_lock.slock);
1da177e4
LT		 1988}
1989EXPORT_SYMBOL(release_sock);
1990
1991int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
4ec93edb 1992{
b7aa0bf7 1993 struct timeval tv;
1da177e4 1994 if (!sock_flag(sk, SOCK_TIMESTAMP))
20d49473 1995 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
b7aa0bf7
ED		 1996 tv = ktime_to_timeval(sk->sk_stamp);
1997 if (tv.tv_sec == -1)
1da177e4 1998 return -ENOENT;
b7aa0bf7
ED		 1999 if (tv.tv_sec == 0) {
2000 sk->sk_stamp = ktime_get_real();
2001 tv = ktime_to_timeval(sk->sk_stamp);
2002 }
2003 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0;
4ec93edb 2004}
1da177e4
LT		 2005EXPORT_SYMBOL(sock_get_timestamp);
2006
ae40eb1e
ED		 2007int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
2008{
2009 struct timespec ts;
2010 if (!sock_flag(sk, SOCK_TIMESTAMP))
20d49473 2011 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
ae40eb1e
ED		 2012 ts = ktime_to_timespec(sk->sk_stamp);
2013 if (ts.tv_sec == -1)
2014 return -ENOENT;
2015 if (ts.tv_sec == 0) {
2016 sk->sk_stamp = ktime_get_real();
2017 ts = ktime_to_timespec(sk->sk_stamp);
2018 }
2019 return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0;
2020}
2021EXPORT_SYMBOL(sock_get_timestampns);
2022
20d49473 2023void sock_enable_timestamp(struct sock *sk, int flag)
4ec93edb 2024{
20d49473
PO		 2025 if (!sock_flag(sk, flag)) {
2026 sock_set_flag(sk, flag);
2027 /*
2028 * we just set one of the two flags which require net
2029 * time stamping, but time stamping might have been on
2030 * already because of the other one
2031 */
2032 if (!sock_flag(sk,
2033 flag == SOCK_TIMESTAMP ?
2034 SOCK_TIMESTAMPING_RX_SOFTWARE :
2035 SOCK_TIMESTAMP))
2036 net_enable_timestamp();
1da177e4
LT		 2037 }
2038}
1da177e4
LT		 2039
2040/*
2041 * Get a socket option on an socket.
2042 *
2043 * FIX: POSIX 1003.1g is very ambiguous here. It states that
2044 * asynchronous errors should be reported by getsockopt. We assume
2045 * this means if you specify SO_ERROR (otherwise whats the point of it).
2046 */
2047int sock_common_getsockopt(struct socket *sock, int level, int optname,
2048 char __user *optval, int __user *optlen)
2049{
2050 struct sock *sk = sock->sk;
2051
2052 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2053}
1da177e4
LT		 2054EXPORT_SYMBOL(sock_common_getsockopt);
2055
3fdadf7d 2056#ifdef CONFIG_COMPAT
543d9cfe
ACM		 2057int compat_sock_common_getsockopt(struct socket *sock, int level, int optname,
2058 char __user *optval, int __user *optlen)
3fdadf7d
DM		 2059{
2060 struct sock *sk = sock->sk;
2061
1e51f951 2062 if (sk->sk_prot->compat_getsockopt != NULL)
543d9cfe
ACM		 2063 return sk->sk_prot->compat_getsockopt(sk, level, optname,
2064 optval, optlen);
3fdadf7d
DM		 2065 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2066}
2067EXPORT_SYMBOL(compat_sock_common_getsockopt);
2068#endif
2069
1da177e4
LT		 2070int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock,
2071 struct msghdr *msg, size_t size, int flags)
2072{
2073 struct sock *sk = sock->sk;
2074 int addr_len = 0;
2075 int err;
2076
2077 err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT,
2078 flags & ~MSG_DONTWAIT, &addr_len);
2079 if (err >= 0)
2080 msg->msg_namelen = addr_len;
2081 return err;
2082}
1da177e4
LT		 2083EXPORT_SYMBOL(sock_common_recvmsg);
2084
2085/*
2086 * Set socket options on an inet socket.
2087 */
2088int sock_common_setsockopt(struct socket *sock, int level, int optname,
b7058842 2089 char __user *optval, unsigned int optlen)
1da177e4
LT		 2090{
2091 struct sock *sk = sock->sk;
2092
2093 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2094}
1da177e4
LT		 2095EXPORT_SYMBOL(sock_common_setsockopt);
2096
3fdadf7d 2097#ifdef CONFIG_COMPAT
543d9cfe 2098int compat_sock_common_setsockopt(struct socket *sock, int level, int optname,
b7058842 2099 char __user *optval, unsigned int optlen)
3fdadf7d
DM		 2100{
2101 struct sock *sk = sock->sk;
2102
543d9cfe
ACM		 2103 if (sk->sk_prot->compat_setsockopt != NULL)
2104 return sk->sk_prot->compat_setsockopt(sk, level, optname,
2105 optval, optlen);
3fdadf7d
DM		 2106 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2107}
2108EXPORT_SYMBOL(compat_sock_common_setsockopt);
2109#endif
2110
1da177e4
LT		 2111void sk_common_release(struct sock *sk)
2112{
2113 if (sk->sk_prot->destroy)
2114 sk->sk_prot->destroy(sk);
2115
2116 /*
2117 * Observation: when sock_common_release is called, processes have
2118 * no access to socket. But net still has.
2119 * Step one, detach it from networking:
2120 *
2121 * A. Remove from hash tables.
2122 */
2123
2124 sk->sk_prot->unhash(sk);
2125
2126 /*
2127 * In this point socket cannot receive new packets, but it is possible
2128 * that some packets are in flight because some CPU runs receiver and
2129 * did hash table lookup before we unhashed socket. They will achieve
2130 * receive queue and will be purged by socket destructor.
2131 *
2132 * Also we still have packets pending on receive queue and probably,
2133 * our own packets waiting in device queues. sock_destroy will drain
2134 * receive queue, but transmitted packets will delay socket destruction
2135 * until the last reference will be released.
2136 */
2137
2138 sock_orphan(sk);
2139
2140 xfrm_sk_free_policy(sk);
2141
e6848976 2142 sk_refcnt_debug_release(sk);
1da177e4
LT		 2143 sock_put(sk);
2144}
1da177e4
LT		 2145EXPORT_SYMBOL(sk_common_release);
2146
2147static DEFINE_RWLOCK(proto_list_lock);
2148static LIST_HEAD(proto_list);
2149
13ff3d6f
PE		 2150#ifdef CONFIG_PROC_FS
2151#define PROTO_INUSE_NR 64 /* should be enough for the first time */
1338d466
PE		 2152struct prot_inuse {
2153 int val[PROTO_INUSE_NR];
2154};
13ff3d6f
PE		 2155
2156static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR);
70ee1159
PE		 2157
2158#ifdef CONFIG_NET_NS
2159void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
2160{
2161 int cpu = smp_processor_id();
2162 per_cpu_ptr(net->core.inuse, cpu)->val[prot->inuse_idx] += val;
2163}
2164EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2165
2166int sock_prot_inuse_get(struct net *net, struct proto *prot)
2167{
2168 int cpu, idx = prot->inuse_idx;
2169 int res = 0;
2170
2171 for_each_possible_cpu(cpu)
2172 res += per_cpu_ptr(net->core.inuse, cpu)->val[idx];
2173
2174 return res >= 0 ? res : 0;
2175}
2176EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
2177
2c8c1e72 2178static int __net_init sock_inuse_init_net(struct net *net)
70ee1159
PE		 2179{
2180 net->core.inuse = alloc_percpu(struct prot_inuse);
2181 return net->core.inuse ? 0 : -ENOMEM;
2182}
2183
2c8c1e72 2184static void __net_exit sock_inuse_exit_net(struct net *net)
70ee1159
PE		 2185{
2186 free_percpu(net->core.inuse);
2187}
2188
2189static struct pernet_operations net_inuse_ops = {
2190 .init = sock_inuse_init_net,
2191 .exit = sock_inuse_exit_net,
2192};
2193
2194static __init int net_inuse_init(void)
2195{
2196 if (register_pernet_subsys(&net_inuse_ops))
2197 panic("Cannot initialize net inuse counters");
2198
2199 return 0;
2200}
2201
2202core_initcall(net_inuse_init);
2203#else
1338d466
PE		 2204static DEFINE_PER_CPU(struct prot_inuse, prot_inuse);
2205
c29a0bc4 2206void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
1338d466
PE		 2207{
2208 __get_cpu_var(prot_inuse).val[prot->inuse_idx] += val;
2209}
2210EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2211
c29a0bc4 2212int sock_prot_inuse_get(struct net *net, struct proto *prot)
1338d466
PE		 2213{
2214 int cpu, idx = prot->inuse_idx;
2215 int res = 0;
2216
2217 for_each_possible_cpu(cpu)
2218 res += per_cpu(prot_inuse, cpu).val[idx];
2219
2220 return res >= 0 ? res : 0;
2221}
2222EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
70ee1159 2223#endif
13ff3d6f
PE		 2224
2225static void assign_proto_idx(struct proto *prot)
2226{
2227 prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR);
2228
2229 if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) {
2230 printk(KERN_ERR "PROTO_INUSE_NR exhausted\n");
2231 return;
2232 }
2233
2234 set_bit(prot->inuse_idx, proto_inuse_idx);
2235}
2236
2237static void release_proto_idx(struct proto *prot)
2238{
2239 if (prot->inuse_idx != PROTO_INUSE_NR - 1)
2240 clear_bit(prot->inuse_idx, proto_inuse_idx);
2241}
2242#else
2243static inline void assign_proto_idx(struct proto *prot)
2244{
2245}
2246
2247static inline void release_proto_idx(struct proto *prot)
2248{
2249}
2250#endif
2251
b733c007
PE		 2252int proto_register(struct proto *prot, int alloc_slab)
2253{
1da177e4
LT		 2254 if (alloc_slab) {
2255 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0,
271b72c7
ED		 2256 SLAB_HWCACHE_ALIGN | prot->slab_flags,
2257 NULL);
1da177e4
LT		 2258
2259 if (prot->slab == NULL) {
2260 printk(KERN_CRIT "%s: Can't create sock SLAB cache!\n",
2261 prot->name);
60e7663d 2262 goto out;
1da177e4 2263 }
2e6599cb
ACM		 2264
2265 if (prot->rsk_prot != NULL) {
faf23422 2266 prot->rsk_prot->slab_name = kasprintf(GFP_KERNEL, "request_sock_%s", prot->name);
7e56b5d6 2267 if (prot->rsk_prot->slab_name == NULL)
2e6599cb
ACM		 2268 goto out_free_sock_slab;
2269
7e56b5d6 2270 prot->rsk_prot->slab = kmem_cache_create(prot->rsk_prot->slab_name,
2e6599cb 2271 prot->rsk_prot->obj_size, 0,
20c2df83 2272 SLAB_HWCACHE_ALIGN, NULL);
2e6599cb
ACM		 2273
2274 if (prot->rsk_prot->slab == NULL) {
2275 printk(KERN_CRIT "%s: Can't create request sock SLAB cache!\n",
2276 prot->name);
2277 goto out_free_request_sock_slab_name;
2278 }
2279 }
8feaf0c0 2280
6d6ee43e 2281 if (prot->twsk_prot != NULL) {
faf23422 2282 prot->twsk_prot->twsk_slab_name = kasprintf(GFP_KERNEL, "tw_sock_%s", prot->name);
8feaf0c0 2283
7e56b5d6 2284 if (prot->twsk_prot->twsk_slab_name == NULL)
8feaf0c0
ACM		 2285 goto out_free_request_sock_slab;
2286
6d6ee43e 2287 prot->twsk_prot->twsk_slab =
7e56b5d6 2288 kmem_cache_create(prot->twsk_prot->twsk_slab_name,
6d6ee43e 2289 prot->twsk_prot->twsk_obj_size,
3ab5aee7
ED		 2290 0,
2291 SLAB_HWCACHE_ALIGN |
2292 prot->slab_flags,
20c2df83 2293 NULL);
6d6ee43e 2294 if (prot->twsk_prot->twsk_slab == NULL)
8feaf0c0
ACM		 2295 goto out_free_timewait_sock_slab_name;
2296 }
1da177e4
LT		 2297 }
2298
2a278051 2299 write_lock(&proto_list_lock);
1da177e4 2300 list_add(&prot->node, &proto_list);
13ff3d6f 2301 assign_proto_idx(prot);
1da177e4 2302 write_unlock(&proto_list_lock);
b733c007
PE		 2303 return 0;
2304
8feaf0c0 2305out_free_timewait_sock_slab_name:
7e56b5d6 2306 kfree(prot->twsk_prot->twsk_slab_name);
8feaf0c0
ACM		 2307out_free_request_sock_slab:
2308 if (prot->rsk_prot && prot->rsk_prot->slab) {
2309 kmem_cache_destroy(prot->rsk_prot->slab);
2310 prot->rsk_prot->slab = NULL;
2311 }
2e6599cb 2312out_free_request_sock_slab_name:
72150e9b
DC		 2313 if (prot->rsk_prot)
2314 kfree(prot->rsk_prot->slab_name);
2e6599cb
ACM		 2315out_free_sock_slab:
2316 kmem_cache_destroy(prot->slab);
2317 prot->slab = NULL;
b733c007
PE		 2318out:
2319 return -ENOBUFS;
1da177e4 2320}
1da177e4
LT		 2321EXPORT_SYMBOL(proto_register);
2322
2323void proto_unregister(struct proto *prot)
2324{
2325 write_lock(&proto_list_lock);
13ff3d6f 2326 release_proto_idx(prot);
0a3f4358
PM		 2327 list_del(&prot->node);
2328 write_unlock(&proto_list_lock);
1da177e4
LT		 2329
2330 if (prot->slab != NULL) {
2331 kmem_cache_destroy(prot->slab);
2332 prot->slab = NULL;
2333 }
2334
2e6599cb 2335 if (prot->rsk_prot != NULL && prot->rsk_prot->slab != NULL) {
2e6599cb 2336 kmem_cache_destroy(prot->rsk_prot->slab);
7e56b5d6 2337 kfree(prot->rsk_prot->slab_name);
2e6599cb
ACM		 2338 prot->rsk_prot->slab = NULL;
2339 }
2340
6d6ee43e 2341 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) {
6d6ee43e 2342 kmem_cache_destroy(prot->twsk_prot->twsk_slab);
7e56b5d6 2343 kfree(prot->twsk_prot->twsk_slab_name);
6d6ee43e 2344 prot->twsk_prot->twsk_slab = NULL;
8feaf0c0 2345 }
1da177e4 2346}
1da177e4
LT		 2347EXPORT_SYMBOL(proto_unregister);
2348
2349#ifdef CONFIG_PROC_FS
1da177e4 2350static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
9a429c49 2351 __acquires(proto_list_lock)
1da177e4
LT		 2352{
2353 read_lock(&proto_list_lock);
60f0438a 2354 return seq_list_start_head(&proto_list, *pos);
1da177e4
LT		 2355}
2356
2357static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2358{
60f0438a 2359 return seq_list_next(v, &proto_list, pos);
1da177e4
LT		 2360}
2361
2362static void proto_seq_stop(struct seq_file *seq, void *v)
9a429c49 2363 __releases(proto_list_lock)
1da177e4
LT		 2364{
2365 read_unlock(&proto_list_lock);
2366}
2367
2368static char proto_method_implemented(const void *method)
2369{
2370 return method == NULL ? 'n' : 'y';
2371}
2372
2373static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
2374{
2375 seq_printf(seq, "%-9s %4u %6d %6d %-3s %6u %-3s %-10s "
2376 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
2377 proto->name,
2378 proto->obj_size,
14e943db 2379 sock_prot_inuse_get(seq_file_net(seq), proto),
1da177e4
LT		 2380 proto->memory_allocated != NULL ? atomic_read(proto->memory_allocated) : -1,
2381 proto->memory_pressure != NULL ? *proto->memory_pressure ? "yes" : "no" : "NI",
2382 proto->max_header,
2383 proto->slab == NULL ? "no" : "yes",
2384 module_name(proto->owner),
2385 proto_method_implemented(proto->close),
2386 proto_method_implemented(proto->connect),
2387 proto_method_implemented(proto->disconnect),
2388 proto_method_implemented(proto->accept),
2389 proto_method_implemented(proto->ioctl),
2390 proto_method_implemented(proto->init),
2391 proto_method_implemented(proto->destroy),
2392 proto_method_implemented(proto->shutdown),
2393 proto_method_implemented(proto->setsockopt),
2394 proto_method_implemented(proto->getsockopt),
2395 proto_method_implemented(proto->sendmsg),
2396 proto_method_implemented(proto->recvmsg),
2397 proto_method_implemented(proto->sendpage),
2398 proto_method_implemented(proto->bind),
2399 proto_method_implemented(proto->backlog_rcv),
2400 proto_method_implemented(proto->hash),
2401 proto_method_implemented(proto->unhash),
2402 proto_method_implemented(proto->get_port),
2403 proto_method_implemented(proto->enter_memory_pressure));
2404}
2405
2406static int proto_seq_show(struct seq_file *seq, void *v)
2407{
60f0438a 2408 if (v == &proto_list)
1da177e4
LT		 2409 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
2410 "protocol",
2411 "size",
2412 "sockets",
2413 "memory",
2414 "press",
2415 "maxhdr",
2416 "slab",
2417 "module",
2418 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
2419 else
60f0438a 2420 proto_seq_printf(seq, list_entry(v, struct proto, node));
1da177e4
LT		 2421 return 0;
2422}
2423
f690808e 2424static const struct seq_operations proto_seq_ops = {
1da177e4
LT		 2425 .start = proto_seq_start,
2426 .next = proto_seq_next,
2427 .stop = proto_seq_stop,
2428 .show = proto_seq_show,
2429};
2430
2431static int proto_seq_open(struct inode *inode, struct file *file)
2432{
14e943db
ED		 2433 return seq_open_net(inode, file, &proto_seq_ops,
2434 sizeof(struct seq_net_private));
1da177e4
LT		 2435}
2436
9a32144e 2437static const struct file_operations proto_seq_fops = {
1da177e4
LT		 2438 .owner = THIS_MODULE,
2439 .open = proto_seq_open,
2440 .read = seq_read,
2441 .llseek = seq_lseek,
14e943db
ED		 2442 .release = seq_release_net,
2443};
2444
2445static __net_init int proto_init_net(struct net *net)
2446{
2447 if (!proc_net_fops_create(net, "protocols", S_IRUGO, &proto_seq_fops))
2448 return -ENOMEM;
2449
2450 return 0;
2451}
2452
2453static __net_exit void proto_exit_net(struct net *net)
2454{
2455 proc_net_remove(net, "protocols");
2456}
2457
2458
2459static __net_initdata struct pernet_operations proto_net_ops = {
2460 .init = proto_init_net,
2461 .exit = proto_exit_net,
1da177e4
LT		 2462};
2463
2464static int __init proto_init(void)
2465{
14e943db 2466 return register_pernet_subsys(&proto_net_ops);
1da177e4
LT		 2467}
2468
2469subsys_initcall(proto_init);
2470
2471#endif /* PROC_FS */
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