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rps: avoid one atomic in enqueue_to_backlog
[linux-2.6-block.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
3b885787
NH		 310 spin_lock_irqsave(&list->lock, flags);
311 skb->dropcount = atomic_read(&sk->sk_drops);
312 __skb_queue_tail(list, skb);
313 spin_unlock_irqrestore(&list->lock, flags);
f0088a50
DV		 314
315 if (!sock_flag(sk, SOCK_DEAD))
316 sk->sk_data_ready(sk, skb_len);
766e9037 317 return 0;
f0088a50
DV		 318}
319EXPORT_SYMBOL(sock_queue_rcv_skb);
320
58a5a7b9 321int sk_receive_skb(struct sock *sk, struct sk_buff *skb, const int nested)
f0088a50
DV		 322{
323 int rc = NET_RX_SUCCESS;
324
fda9ef5d 325 if (sk_filter(sk, skb))
f0088a50
DV		 326 goto discard_and_relse;
327
328 skb->dev = NULL;
329
c377411f
ED		 330 if (sk_rcvqueues_full(sk, skb)) {
331 atomic_inc(&sk->sk_drops);
332 goto discard_and_relse;
333 }
58a5a7b9
ACM		 334 if (nested)
335 bh_lock_sock_nested(sk);
336 else
337 bh_lock_sock(sk);
a5b5bb9a
IM		 338 if (!sock_owned_by_user(sk)) {
339 /*
340 * trylock + unlock semantics:
341 */
342 mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_);
343
c57943a1 344 rc = sk_backlog_rcv(sk, skb);
a5b5bb9a
IM		 345
346 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
a3a858ff 347 } else if (sk_add_backlog(sk, skb)) {
8eae939f
ZY		 348 bh_unlock_sock(sk);
349 atomic_inc(&sk->sk_drops);
350 goto discard_and_relse;
351 }
352
f0088a50
DV		 353 bh_unlock_sock(sk);
354out:
355 sock_put(sk);
356 return rc;
357discard_and_relse:
358 kfree_skb(skb);
359 goto out;
360}
361EXPORT_SYMBOL(sk_receive_skb);
362
ea94ff3b
KK		 363void sk_reset_txq(struct sock *sk)
364{
365 sk_tx_queue_clear(sk);
366}
367EXPORT_SYMBOL(sk_reset_txq);
368
f0088a50
DV		 369struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie)
370{
b6c6712a 371 struct dst_entry *dst = __sk_dst_get(sk);
f0088a50
DV		 372
373 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
e022f0b4 374 sk_tx_queue_clear(sk);
b6c6712a 375 rcu_assign_pointer(sk->sk_dst_cache, NULL);
f0088a50
DV		 376 dst_release(dst);
377 return NULL;
378 }
379
380 return dst;
381}
382EXPORT_SYMBOL(__sk_dst_check);
383
384struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie)
385{
386 struct dst_entry *dst = sk_dst_get(sk);
387
388 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
389 sk_dst_reset(sk);
390 dst_release(dst);
391 return NULL;
392 }
393
394 return dst;
395}
396EXPORT_SYMBOL(sk_dst_check);
397
4878809f
DM		 398static int sock_bindtodevice(struct sock *sk, char __user *optval, int optlen)
399{
400 int ret = -ENOPROTOOPT;
401#ifdef CONFIG_NETDEVICES
3b1e0a65 402 struct net *net = sock_net(sk);
4878809f
DM		 403 char devname[IFNAMSIZ];
404 int index;
405
406 /* Sorry... */
407 ret = -EPERM;
408 if (!capable(CAP_NET_RAW))
409 goto out;
410
411 ret = -EINVAL;
412 if (optlen < 0)
413 goto out;
414
415 /* Bind this socket to a particular device like "eth0",
416 * as specified in the passed interface name. If the
417 * name is "" or the option length is zero the socket
418 * is not bound.
419 */
420 if (optlen > IFNAMSIZ - 1)
421 optlen = IFNAMSIZ - 1;
422 memset(devname, 0, sizeof(devname));
423
424 ret = -EFAULT;
425 if (copy_from_user(devname, optval, optlen))
426 goto out;
427
000ba2e4
DM		 428 index = 0;
429 if (devname[0] != '\0') {
bf8e56bf 430 struct net_device *dev;
4878809f 431
bf8e56bf
ED		 432 rcu_read_lock();
433 dev = dev_get_by_name_rcu(net, devname);
434 if (dev)
435 index = dev->ifindex;
436 rcu_read_unlock();
4878809f
DM		 437 ret = -ENODEV;
438 if (!dev)
439 goto out;
4878809f
DM		 440 }
441
442 lock_sock(sk);
443 sk->sk_bound_dev_if = index;
444 sk_dst_reset(sk);
445 release_sock(sk);
446
447 ret = 0;
448
449out:
450#endif
451
452 return ret;
453}
454
c0ef877b
PE		 455static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool)
456{
457 if (valbool)
458 sock_set_flag(sk, bit);
459 else
460 sock_reset_flag(sk, bit);
461}
462
1da177e4
LT		 463/*
464 * This is meant for all protocols to use and covers goings on
465 * at the socket level. Everything here is generic.
466 */
467
468int sock_setsockopt(struct socket *sock, int level, int optname,
b7058842 469 char __user *optval, unsigned int optlen)
1da177e4 470{
2a91525c 471 struct sock *sk = sock->sk;
1da177e4
LT		 472 int val;
473 int valbool;
474 struct linger ling;
475 int ret = 0;
4ec93edb 476
1da177e4
LT		 477 /*
478 * Options without arguments
479 */
480
4878809f
DM		 481 if (optname == SO_BINDTODEVICE)
482 return sock_bindtodevice(sk, optval, optlen);
483
e71a4783
SH		 484 if (optlen < sizeof(int))
485 return -EINVAL;
4ec93edb 486
1da177e4
LT		 487 if (get_user(val, (int __user *)optval))
488 return -EFAULT;
4ec93edb 489
2a91525c 490 valbool = val ? 1 : 0;
1da177e4
LT		 491
492 lock_sock(sk);
493
2a91525c 494 switch (optname) {
e71a4783 495 case SO_DEBUG:
2a91525c 496 if (val && !capable(CAP_NET_ADMIN))
e71a4783 497 ret = -EACCES;
2a91525c 498 else
c0ef877b 499 sock_valbool_flag(sk, SOCK_DBG, valbool);
e71a4783
SH		 500 break;
501 case SO_REUSEADDR:
502 sk->sk_reuse = valbool;
503 break;
504 case SO_TYPE:
49c794e9 505 case SO_PROTOCOL:
0d6038ee 506 case SO_DOMAIN:
e71a4783
SH		 507 case SO_ERROR:
508 ret = -ENOPROTOOPT;
509 break;
510 case SO_DONTROUTE:
c0ef877b 511 sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool);
e71a4783
SH		 512 break;
513 case SO_BROADCAST:
514 sock_valbool_flag(sk, SOCK_BROADCAST, valbool);
515 break;
516 case SO_SNDBUF:
517 /* Don't error on this BSD doesn't and if you think
518 about it this is right. Otherwise apps have to
519 play 'guess the biggest size' games. RCVBUF/SNDBUF
520 are treated in BSD as hints */
521
522 if (val > sysctl_wmem_max)
523 val = sysctl_wmem_max;
b0573dea 524set_sndbuf:
e71a4783
SH		 525 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
526 if ((val * 2) < SOCK_MIN_SNDBUF)
527 sk->sk_sndbuf = SOCK_MIN_SNDBUF;
528 else
529 sk->sk_sndbuf = val * 2;
1da177e4 530
e71a4783
SH		 531 /*
532 * Wake up sending tasks if we
533 * upped the value.
534 */
535 sk->sk_write_space(sk);
536 break;
1da177e4 537
e71a4783
SH		 538 case SO_SNDBUFFORCE:
539 if (!capable(CAP_NET_ADMIN)) {
540 ret = -EPERM;
541 break;
542 }
543 goto set_sndbuf;
b0573dea 544
e71a4783
SH		 545 case SO_RCVBUF:
546 /* Don't error on this BSD doesn't and if you think
547 about it this is right. Otherwise apps have to
548 play 'guess the biggest size' games. RCVBUF/SNDBUF
549 are treated in BSD as hints */
4ec93edb 550
e71a4783
SH		 551 if (val > sysctl_rmem_max)
552 val = sysctl_rmem_max;
b0573dea 553set_rcvbuf:
e71a4783
SH		 554 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
555 /*
556 * We double it on the way in to account for
557 * "struct sk_buff" etc. overhead. Applications
558 * assume that the SO_RCVBUF setting they make will
559 * allow that much actual data to be received on that
560 * socket.
561 *
562 * Applications are unaware that "struct sk_buff" and
563 * other overheads allocate from the receive buffer
564 * during socket buffer allocation.
565 *
566 * And after considering the possible alternatives,
567 * returning the value we actually used in getsockopt
568 * is the most desirable behavior.
569 */
570 if ((val * 2) < SOCK_MIN_RCVBUF)
571 sk->sk_rcvbuf = SOCK_MIN_RCVBUF;
572 else
573 sk->sk_rcvbuf = val * 2;
574 break;
575
576 case SO_RCVBUFFORCE:
577 if (!capable(CAP_NET_ADMIN)) {
578 ret = -EPERM;
1da177e4 579 break;
e71a4783
SH		 580 }
581 goto set_rcvbuf;
1da177e4 582
e71a4783 583 case SO_KEEPALIVE:
1da177e4 584#ifdef CONFIG_INET
e71a4783
SH		 585 if (sk->sk_protocol == IPPROTO_TCP)
586 tcp_set_keepalive(sk, valbool);
1da177e4 587#endif
e71a4783
SH		 588 sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool);
589 break;
590
591 case SO_OOBINLINE:
592 sock_valbool_flag(sk, SOCK_URGINLINE, valbool);
593 break;
594
595 case SO_NO_CHECK:
596 sk->sk_no_check = valbool;
597 break;
598
599 case SO_PRIORITY:
600 if ((val >= 0 && val <= 6) || capable(CAP_NET_ADMIN))
601 sk->sk_priority = val;
602 else
603 ret = -EPERM;
604 break;
605
606 case SO_LINGER:
607 if (optlen < sizeof(ling)) {
608 ret = -EINVAL; /* 1003.1g */
1da177e4 609 break;
e71a4783 610 }
2a91525c 611 if (copy_from_user(&ling, optval, sizeof(ling))) {
e71a4783 612 ret = -EFAULT;
1da177e4 613 break;
e71a4783
SH		 614 }
615 if (!ling.l_onoff)
616 sock_reset_flag(sk, SOCK_LINGER);
617 else {
1da177e4 618#if (BITS_PER_LONG == 32)
e71a4783
SH		 619 if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ)
620 sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT;
1da177e4 621 else
e71a4783
SH		 622#endif
623 sk->sk_lingertime = (unsigned int)ling.l_linger * HZ;
624 sock_set_flag(sk, SOCK_LINGER);
625 }
626 break;
627
628 case SO_BSDCOMPAT:
629 sock_warn_obsolete_bsdism("setsockopt");
630 break;
631
632 case SO_PASSCRED:
633 if (valbool)
634 set_bit(SOCK_PASSCRED, &sock->flags);
635 else
636 clear_bit(SOCK_PASSCRED, &sock->flags);
637 break;
638
639 case SO_TIMESTAMP:
92f37fd2 640 case SO_TIMESTAMPNS:
e71a4783 641 if (valbool) {
92f37fd2
ED		 642 if (optname == SO_TIMESTAMP)
643 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
644 else
645 sock_set_flag(sk, SOCK_RCVTSTAMPNS);
e71a4783 646 sock_set_flag(sk, SOCK_RCVTSTAMP);
20d49473 647 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
92f37fd2 648 } else {
e71a4783 649 sock_reset_flag(sk, SOCK_RCVTSTAMP);
92f37fd2
ED		 650 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
651 }
e71a4783
SH		 652 break;
653
20d49473
PO		 654 case SO_TIMESTAMPING:
655 if (val & ~SOF_TIMESTAMPING_MASK) {
f249fb78 656 ret = -EINVAL;
20d49473
PO		 657 break;
658 }
659 sock_valbool_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE,
660 val & SOF_TIMESTAMPING_TX_HARDWARE);
661 sock_valbool_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE,
662 val & SOF_TIMESTAMPING_TX_SOFTWARE);
663 sock_valbool_flag(sk, SOCK_TIMESTAMPING_RX_HARDWARE,
664 val & SOF_TIMESTAMPING_RX_HARDWARE);
665 if (val & SOF_TIMESTAMPING_RX_SOFTWARE)
666 sock_enable_timestamp(sk,
667 SOCK_TIMESTAMPING_RX_SOFTWARE);
668 else
669 sock_disable_timestamp(sk,
670 SOCK_TIMESTAMPING_RX_SOFTWARE);
671 sock_valbool_flag(sk, SOCK_TIMESTAMPING_SOFTWARE,
672 val & SOF_TIMESTAMPING_SOFTWARE);
673 sock_valbool_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE,
674 val & SOF_TIMESTAMPING_SYS_HARDWARE);
675 sock_valbool_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE,
676 val & SOF_TIMESTAMPING_RAW_HARDWARE);
677 break;
678
e71a4783
SH		 679 case SO_RCVLOWAT:
680 if (val < 0)
681 val = INT_MAX;
682 sk->sk_rcvlowat = val ? : 1;
683 break;
684
685 case SO_RCVTIMEO:
686 ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen);
687 break;
688
689 case SO_SNDTIMEO:
690 ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen);
691 break;
1da177e4 692
e71a4783
SH		 693 case SO_ATTACH_FILTER:
694 ret = -EINVAL;
695 if (optlen == sizeof(struct sock_fprog)) {
696 struct sock_fprog fprog;
1da177e4 697
e71a4783
SH		 698 ret = -EFAULT;
699 if (copy_from_user(&fprog, optval, sizeof(fprog)))
1da177e4 700 break;
e71a4783
SH		 701
702 ret = sk_attach_filter(&fprog, sk);
703 }
704 break;
705
706 case SO_DETACH_FILTER:
55b33325 707 ret = sk_detach_filter(sk);
e71a4783 708 break;
1da177e4 709
e71a4783
SH		 710 case SO_PASSSEC:
711 if (valbool)
712 set_bit(SOCK_PASSSEC, &sock->flags);
713 else
714 clear_bit(SOCK_PASSSEC, &sock->flags);
715 break;
4a19ec58
LAT		 716 case SO_MARK:
717 if (!capable(CAP_NET_ADMIN))
718 ret = -EPERM;
2a91525c 719 else
4a19ec58 720 sk->sk_mark = val;
4a19ec58 721 break;
877ce7c1 722
1da177e4
LT		 723 /* We implement the SO_SNDLOWAT etc to
724 not be settable (1003.1g 5.3) */
3b885787
NH		 725 case SO_RXQ_OVFL:
726 if (valbool)
727 sock_set_flag(sk, SOCK_RXQ_OVFL);
728 else
729 sock_reset_flag(sk, SOCK_RXQ_OVFL);
730 break;
e71a4783
SH		 731 default:
732 ret = -ENOPROTOOPT;
733 break;
4ec93edb 734 }
1da177e4
LT		 735 release_sock(sk);
736 return ret;
737}
2a91525c 738EXPORT_SYMBOL(sock_setsockopt);
1da177e4
LT		 739
740
741int sock_getsockopt(struct socket *sock, int level, int optname,
742 char __user *optval, int __user *optlen)
743{
744 struct sock *sk = sock->sk;
4ec93edb 745
e71a4783 746 union {
4ec93edb
YH		 747 int val;
748 struct linger ling;
1da177e4
LT		 749 struct timeval tm;
750 } v;
4ec93edb 751
4d0392be 752 int lv = sizeof(int);
1da177e4 753 int len;
4ec93edb 754
e71a4783 755 if (get_user(len, optlen))
4ec93edb 756 return -EFAULT;
e71a4783 757 if (len < 0)
1da177e4 758 return -EINVAL;
4ec93edb 759
50fee1de 760 memset(&v, 0, sizeof(v));
df0bca04 761
2a91525c 762 switch (optname) {
e71a4783
SH		 763 case SO_DEBUG:
764 v.val = sock_flag(sk, SOCK_DBG);
765 break;
766
767 case SO_DONTROUTE:
768 v.val = sock_flag(sk, SOCK_LOCALROUTE);
769 break;
770
771 case SO_BROADCAST:
772 v.val = !!sock_flag(sk, SOCK_BROADCAST);
773 break;
774
775 case SO_SNDBUF:
776 v.val = sk->sk_sndbuf;
777 break;
778
779 case SO_RCVBUF:
780 v.val = sk->sk_rcvbuf;
781 break;
782
783 case SO_REUSEADDR:
784 v.val = sk->sk_reuse;
785 break;
786
787 case SO_KEEPALIVE:
788 v.val = !!sock_flag(sk, SOCK_KEEPOPEN);
789 break;
790
791 case SO_TYPE:
792 v.val = sk->sk_type;
793 break;
794
49c794e9
JE		 795 case SO_PROTOCOL:
796 v.val = sk->sk_protocol;
797 break;
798
0d6038ee
JE		 799 case SO_DOMAIN:
800 v.val = sk->sk_family;
801 break;
802
e71a4783
SH		 803 case SO_ERROR:
804 v.val = -sock_error(sk);
2a91525c 805 if (v.val == 0)
e71a4783
SH		 806 v.val = xchg(&sk->sk_err_soft, 0);
807 break;
808
809 case SO_OOBINLINE:
810 v.val = !!sock_flag(sk, SOCK_URGINLINE);
811 break;
812
813 case SO_NO_CHECK:
814 v.val = sk->sk_no_check;
815 break;
816
817 case SO_PRIORITY:
818 v.val = sk->sk_priority;
819 break;
820
821 case SO_LINGER:
822 lv = sizeof(v.ling);
823 v.ling.l_onoff = !!sock_flag(sk, SOCK_LINGER);
824 v.ling.l_linger = sk->sk_lingertime / HZ;
825 break;
826
827 case SO_BSDCOMPAT:
828 sock_warn_obsolete_bsdism("getsockopt");
829 break;
830
831 case SO_TIMESTAMP:
92f37fd2
ED		 832 v.val = sock_flag(sk, SOCK_RCVTSTAMP) &&
833 !sock_flag(sk, SOCK_RCVTSTAMPNS);
834 break;
835
836 case SO_TIMESTAMPNS:
837 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS);
e71a4783
SH		 838 break;
839
20d49473
PO		 840 case SO_TIMESTAMPING:
841 v.val = 0;
842 if (sock_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE))
843 v.val |= SOF_TIMESTAMPING_TX_HARDWARE;
844 if (sock_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE))
845 v.val |= SOF_TIMESTAMPING_TX_SOFTWARE;
846 if (sock_flag(sk, SOCK_TIMESTAMPING_RX_HARDWARE))
847 v.val |= SOF_TIMESTAMPING_RX_HARDWARE;
848 if (sock_flag(sk, SOCK_TIMESTAMPING_RX_SOFTWARE))
849 v.val |= SOF_TIMESTAMPING_RX_SOFTWARE;
850 if (sock_flag(sk, SOCK_TIMESTAMPING_SOFTWARE))
851 v.val |= SOF_TIMESTAMPING_SOFTWARE;
852 if (sock_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE))
853 v.val |= SOF_TIMESTAMPING_SYS_HARDWARE;
854 if (sock_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE))
855 v.val |= SOF_TIMESTAMPING_RAW_HARDWARE;
856 break;
857
e71a4783 858 case SO_RCVTIMEO:
2a91525c 859 lv = sizeof(struct timeval);
e71a4783
SH		 860 if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) {
861 v.tm.tv_sec = 0;
862 v.tm.tv_usec = 0;
863 } else {
864 v.tm.tv_sec = sk->sk_rcvtimeo / HZ;
865 v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ;
866 }
867 break;
868
869 case SO_SNDTIMEO:
2a91525c 870 lv = sizeof(struct timeval);
e71a4783
SH		 871 if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) {
872 v.tm.tv_sec = 0;
873 v.tm.tv_usec = 0;
874 } else {
875 v.tm.tv_sec = sk->sk_sndtimeo / HZ;
876 v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ;
877 }
878 break;
1da177e4 879
e71a4783
SH		 880 case SO_RCVLOWAT:
881 v.val = sk->sk_rcvlowat;
882 break;
1da177e4 883
e71a4783 884 case SO_SNDLOWAT:
2a91525c 885 v.val = 1;
e71a4783 886 break;
1da177e4 887
e71a4783
SH		 888 case SO_PASSCRED:
889 v.val = test_bit(SOCK_PASSCRED, &sock->flags) ? 1 : 0;
890 break;
1da177e4 891
e71a4783
SH		 892 case SO_PEERCRED:
893 if (len > sizeof(sk->sk_peercred))
894 len = sizeof(sk->sk_peercred);
895 if (copy_to_user(optval, &sk->sk_peercred, len))
896 return -EFAULT;
897 goto lenout;
1da177e4 898
e71a4783
SH		 899 case SO_PEERNAME:
900 {
901 char address[128];
902
903 if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2))
904 return -ENOTCONN;
905 if (lv < len)
906 return -EINVAL;
907 if (copy_to_user(optval, address, len))
908 return -EFAULT;
909 goto lenout;
910 }
1da177e4 911
e71a4783
SH		 912 /* Dubious BSD thing... Probably nobody even uses it, but
913 * the UNIX standard wants it for whatever reason... -DaveM
914 */
915 case SO_ACCEPTCONN:
916 v.val = sk->sk_state == TCP_LISTEN;
917 break;
1da177e4 918
e71a4783
SH		 919 case SO_PASSSEC:
920 v.val = test_bit(SOCK_PASSSEC, &sock->flags) ? 1 : 0;
921 break;
877ce7c1 922
e71a4783
SH		 923 case SO_PEERSEC:
924 return security_socket_getpeersec_stream(sock, optval, optlen, len);
1da177e4 925
4a19ec58
LAT		 926 case SO_MARK:
927 v.val = sk->sk_mark;
928 break;
929
3b885787
NH		 930 case SO_RXQ_OVFL:
931 v.val = !!sock_flag(sk, SOCK_RXQ_OVFL);
932 break;
933
e71a4783
SH		 934 default:
935 return -ENOPROTOOPT;
1da177e4 936 }
e71a4783 937
1da177e4
LT		 938 if (len > lv)
939 len = lv;
940 if (copy_to_user(optval, &v, len))
941 return -EFAULT;
942lenout:
4ec93edb
YH		 943 if (put_user(len, optlen))
944 return -EFAULT;
945 return 0;
1da177e4
LT		 946}
947
a5b5bb9a
IM		 948/*
949 * Initialize an sk_lock.
950 *
951 * (We also register the sk_lock with the lock validator.)
952 */
b6f99a21 953static inline void sock_lock_init(struct sock *sk)
a5b5bb9a 954{
ed07536e
PZ		 955 sock_lock_init_class_and_name(sk,
956 af_family_slock_key_strings[sk->sk_family],
957 af_family_slock_keys + sk->sk_family,
958 af_family_key_strings[sk->sk_family],
959 af_family_keys + sk->sk_family);
a5b5bb9a
IM		 960}
961
4dc6dc71
ED		 962/*
963 * Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet,
964 * even temporarly, because of RCU lookups. sk_node should also be left as is.
965 */
f1a6c4da
PE		 966static void sock_copy(struct sock *nsk, const struct sock *osk)
967{
968#ifdef CONFIG_SECURITY_NETWORK
969 void *sptr = nsk->sk_security;
970#endif
4dc6dc71 971 BUILD_BUG_ON(offsetof(struct sock, sk_copy_start) !=
e022f0b4
KK		 972 sizeof(osk->sk_node) + sizeof(osk->sk_refcnt) +
973 sizeof(osk->sk_tx_queue_mapping));
4dc6dc71
ED		 974 memcpy(&nsk->sk_copy_start, &osk->sk_copy_start,
975 osk->sk_prot->obj_size - offsetof(struct sock, sk_copy_start));
f1a6c4da
PE		 976#ifdef CONFIG_SECURITY_NETWORK
977 nsk->sk_security = sptr;
978 security_sk_clone(osk, nsk);
979#endif
980}
981
2e4afe7b
PE		 982static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority,
983 int family)
c308c1b2
PE		 984{
985 struct sock *sk;
986 struct kmem_cache *slab;
987
988 slab = prot->slab;
e912b114
ED		 989 if (slab != NULL) {
990 sk = kmem_cache_alloc(slab, priority & ~__GFP_ZERO);
991 if (!sk)
992 return sk;
993 if (priority & __GFP_ZERO) {
994 /*
995 * caches using SLAB_DESTROY_BY_RCU should let
996 * sk_node.next un-modified. Special care is taken
997 * when initializing object to zero.
998 */
999 if (offsetof(struct sock, sk_node.next) != 0)
1000 memset(sk, 0, offsetof(struct sock, sk_node.next));
1001 memset(&sk->sk_node.pprev, 0,
1002 prot->obj_size - offsetof(struct sock,
1003 sk_node.pprev));
1004 }
1005 }
c308c1b2
PE		 1006 else
1007 sk = kmalloc(prot->obj_size, priority);
1008
2e4afe7b 1009 if (sk != NULL) {
a98b65a3
VN		 1010 kmemcheck_annotate_bitfield(sk, flags);
1011
2e4afe7b
PE		 1012 if (security_sk_alloc(sk, family, priority))
1013 goto out_free;
1014
1015 if (!try_module_get(prot->owner))
1016 goto out_free_sec;
e022f0b4 1017 sk_tx_queue_clear(sk);
2e4afe7b
PE		 1018 }
1019
c308c1b2 1020 return sk;
2e4afe7b
PE		 1021
1022out_free_sec:
1023 security_sk_free(sk);
1024out_free:
1025 if (slab != NULL)
1026 kmem_cache_free(slab, sk);
1027 else
1028 kfree(sk);
1029 return NULL;
c308c1b2
PE		 1030}
1031
1032static void sk_prot_free(struct proto *prot, struct sock *sk)
1033{
1034 struct kmem_cache *slab;
2e4afe7b 1035 struct module *owner;
c308c1b2 1036
2e4afe7b 1037 owner = prot->owner;
c308c1b2 1038 slab = prot->slab;
2e4afe7b
PE		 1039
1040 security_sk_free(sk);
c308c1b2
PE		 1041 if (slab != NULL)
1042 kmem_cache_free(slab, sk);
1043 else
1044 kfree(sk);
2e4afe7b 1045 module_put(owner);
c308c1b2
PE		 1046}
1047
1da177e4
LT		 1048/**
1049 * sk_alloc - All socket objects are allocated here
c4ea43c5 1050 * @net: the applicable net namespace
4dc3b16b
PP		 1051 * @family: protocol family
1052 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1053 * @prot: struct proto associated with this new sock instance
1da177e4 1054 */
1b8d7ae4 1055struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
6257ff21 1056 struct proto *prot)
1da177e4 1057{
c308c1b2 1058 struct sock *sk;
1da177e4 1059
154adbc8 1060 sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family);
1da177e4 1061 if (sk) {
154adbc8
PE		 1062 sk->sk_family = family;
1063 /*
1064 * See comment in struct sock definition to understand
1065 * why we need sk_prot_creator -acme
1066 */
1067 sk->sk_prot = sk->sk_prot_creator = prot;
1068 sock_lock_init(sk);
3b1e0a65 1069 sock_net_set(sk, get_net(net));
d66ee058 1070 atomic_set(&sk->sk_wmem_alloc, 1);
1da177e4 1071 }
a79af59e 1072
2e4afe7b 1073 return sk;
1da177e4 1074}
2a91525c 1075EXPORT_SYMBOL(sk_alloc);
1da177e4 1076
2b85a34e 1077static void __sk_free(struct sock *sk)
1da177e4
LT		 1078{
1079 struct sk_filter *filter;
1da177e4
LT		 1080
1081 if (sk->sk_destruct)
1082 sk->sk_destruct(sk);
1083
a898def2
PM		 1084 filter = rcu_dereference_check(sk->sk_filter,
1085 atomic_read(&sk->sk_wmem_alloc) == 0);
1da177e4 1086 if (filter) {
309dd5fc 1087 sk_filter_uncharge(sk, filter);
fda9ef5d 1088 rcu_assign_pointer(sk->sk_filter, NULL);
1da177e4
LT		 1089 }
1090
20d49473
PO		 1091 sock_disable_timestamp(sk, SOCK_TIMESTAMP);
1092 sock_disable_timestamp(sk, SOCK_TIMESTAMPING_RX_SOFTWARE);
1da177e4
LT		 1093
1094 if (atomic_read(&sk->sk_omem_alloc))
1095 printk(KERN_DEBUG "%s: optmem leakage (%d bytes) detected.\n",
0dc47877 1096 __func__, atomic_read(&sk->sk_omem_alloc));
1da177e4 1097
3b1e0a65 1098 put_net(sock_net(sk));
c308c1b2 1099 sk_prot_free(sk->sk_prot_creator, sk);
1da177e4 1100}
2b85a34e
ED		 1101
1102void sk_free(struct sock *sk)
1103{
1104 /*
1105 * We substract one from sk_wmem_alloc and can know if
1106 * some packets are still in some tx queue.
1107 * If not null, sock_wfree() will call __sk_free(sk) later
1108 */
1109 if (atomic_dec_and_test(&sk->sk_wmem_alloc))
1110 __sk_free(sk);
1111}
2a91525c 1112EXPORT_SYMBOL(sk_free);
1da177e4 1113
edf02087
DL		 1114/*
1115 * Last sock_put should drop referrence to sk->sk_net. It has already
1116 * been dropped in sk_change_net. Taking referrence to stopping namespace
1117 * is not an option.
1118 * Take referrence to a socket to remove it from hash _alive_ and after that
1119 * destroy it in the context of init_net.
1120 */
1121void sk_release_kernel(struct sock *sk)
1122{
1123 if (sk == NULL || sk->sk_socket == NULL)
1124 return;
1125
1126 sock_hold(sk);
1127 sock_release(sk->sk_socket);
65a18ec5 1128 release_net(sock_net(sk));
3b1e0a65 1129 sock_net_set(sk, get_net(&init_net));
edf02087
DL		 1130 sock_put(sk);
1131}
45af1754 1132EXPORT_SYMBOL(sk_release_kernel);
edf02087 1133
dd0fc66f 1134struct sock *sk_clone(const struct sock *sk, const gfp_t priority)
87d11ceb 1135{
8fd1d178 1136 struct sock *newsk;
87d11ceb 1137
8fd1d178 1138 newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family);
87d11ceb
ACM		 1139 if (newsk != NULL) {
1140 struct sk_filter *filter;
1141
892c141e 1142 sock_copy(newsk, sk);
87d11ceb
ACM		 1143
1144 /* SANITY */
3b1e0a65 1145 get_net(sock_net(newsk));
87d11ceb
ACM		 1146 sk_node_init(&newsk->sk_node);
1147 sock_lock_init(newsk);
1148 bh_lock_sock(newsk);
fa438ccf 1149 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL;
8eae939f 1150 newsk->sk_backlog.len = 0;
87d11ceb
ACM		 1151
1152 atomic_set(&newsk->sk_rmem_alloc, 0);
2b85a34e
ED		 1153 /*
1154 * sk_wmem_alloc set to one (see sk_free() and sock_wfree())
1155 */
1156 atomic_set(&newsk->sk_wmem_alloc, 1);
87d11ceb
ACM		 1157 atomic_set(&newsk->sk_omem_alloc, 0);
1158 skb_queue_head_init(&newsk->sk_receive_queue);
1159 skb_queue_head_init(&newsk->sk_write_queue);
97fc2f08
CL		 1160#ifdef CONFIG_NET_DMA
1161 skb_queue_head_init(&newsk->sk_async_wait_queue);
1162#endif
87d11ceb 1163
b6c6712a 1164 spin_lock_init(&newsk->sk_dst_lock);
87d11ceb 1165 rwlock_init(&newsk->sk_callback_lock);
443aef0e
PZ		 1166 lockdep_set_class_and_name(&newsk->sk_callback_lock,
1167 af_callback_keys + newsk->sk_family,
1168 af_family_clock_key_strings[newsk->sk_family]);
87d11ceb
ACM		 1169
1170 newsk->sk_dst_cache = NULL;
1171 newsk->sk_wmem_queued = 0;
1172 newsk->sk_forward_alloc = 0;
1173 newsk->sk_send_head = NULL;
87d11ceb
ACM		 1174 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
1175
1176 sock_reset_flag(newsk, SOCK_DONE);
1177 skb_queue_head_init(&newsk->sk_error_queue);
1178
1179 filter = newsk->sk_filter;
1180 if (filter != NULL)
1181 sk_filter_charge(newsk, filter);
1182
1183 if (unlikely(xfrm_sk_clone_policy(newsk))) {
1184 /* It is still raw copy of parent, so invalidate
1185 * destructor and make plain sk_free() */
1186 newsk->sk_destruct = NULL;
1187 sk_free(newsk);
1188 newsk = NULL;
1189 goto out;
1190 }
1191
1192 newsk->sk_err = 0;
1193 newsk->sk_priority = 0;
4dc6dc71
ED		 1194 /*
1195 * Before updating sk_refcnt, we must commit prior changes to memory
1196 * (Documentation/RCU/rculist_nulls.txt for details)
1197 */
1198 smp_wmb();
87d11ceb
ACM		 1199 atomic_set(&newsk->sk_refcnt, 2);
1200
1201 /*
1202 * Increment the counter in the same struct proto as the master
1203 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
1204 * is the same as sk->sk_prot->socks, as this field was copied
1205 * with memcpy).
1206 *
1207 * This _changes_ the previous behaviour, where
1208 * tcp_create_openreq_child always was incrementing the
1209 * equivalent to tcp_prot->socks (inet_sock_nr), so this have
1210 * to be taken into account in all callers. -acme
1211 */
1212 sk_refcnt_debug_inc(newsk);
972692e0 1213 sk_set_socket(newsk, NULL);
43815482 1214 newsk->sk_wq = NULL;
87d11ceb
ACM		 1215
1216 if (newsk->sk_prot->sockets_allocated)
1748376b 1217 percpu_counter_inc(newsk->sk_prot->sockets_allocated);
704da560
OP		 1218
1219 if (sock_flag(newsk, SOCK_TIMESTAMP) ||
1220 sock_flag(newsk, SOCK_TIMESTAMPING_RX_SOFTWARE))
1221 net_enable_timestamp();
87d11ceb
ACM		 1222 }
1223out:
1224 return newsk;
1225}
87d11ceb
ACM		 1226EXPORT_SYMBOL_GPL(sk_clone);
1227
9958089a
AK		 1228void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
1229{
1230 __sk_dst_set(sk, dst);
1231 sk->sk_route_caps = dst->dev->features;
1232 if (sk->sk_route_caps & NETIF_F_GSO)
4fcd6b99 1233 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE;
a465419b 1234 sk->sk_route_caps &= ~sk->sk_route_nocaps;
9958089a 1235 if (sk_can_gso(sk)) {
82cc1a7a 1236 if (dst->header_len) {
9958089a 1237 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
82cc1a7a 1238 } else {
9958089a 1239 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
82cc1a7a
PWJ		 1240 sk->sk_gso_max_size = dst->dev->gso_max_size;
1241 }
9958089a
AK		 1242 }
1243}
1244EXPORT_SYMBOL_GPL(sk_setup_caps);
1245
1da177e4
LT		 1246void __init sk_init(void)
1247{
4481374c 1248 if (totalram_pages <= 4096) {
1da177e4
LT		 1249 sysctl_wmem_max = 32767;
1250 sysctl_rmem_max = 32767;
1251 sysctl_wmem_default = 32767;
1252 sysctl_rmem_default = 32767;
4481374c 1253 } else if (totalram_pages >= 131072) {
1da177e4
LT		 1254 sysctl_wmem_max = 131071;
1255 sysctl_rmem_max = 131071;
1256 }
1257}
1258
1259/*
1260 * Simple resource managers for sockets.
1261 */
1262
1263
4ec93edb
YH		 1264/*
1265 * Write buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1266 */
1267void sock_wfree(struct sk_buff *skb)
1268{
1269 struct sock *sk = skb->sk;
d99927f4 1270 unsigned int len = skb->truesize;
1da177e4 1271
d99927f4
ED		 1272 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) {
1273 /*
1274 * Keep a reference on sk_wmem_alloc, this will be released
1275 * after sk_write_space() call
1276 */
1277 atomic_sub(len - 1, &sk->sk_wmem_alloc);
1da177e4 1278 sk->sk_write_space(sk);
d99927f4
ED		 1279 len = 1;
1280 }
2b85a34e 1281 /*
d99927f4
ED		 1282 * if sk_wmem_alloc reaches 0, we must finish what sk_free()
1283 * could not do because of in-flight packets
2b85a34e 1284 */
d99927f4 1285 if (atomic_sub_and_test(len, &sk->sk_wmem_alloc))
2b85a34e 1286 __sk_free(sk);
1da177e4 1287}
2a91525c 1288EXPORT_SYMBOL(sock_wfree);
1da177e4 1289
4ec93edb
YH		 1290/*
1291 * Read buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1292 */
1293void sock_rfree(struct sk_buff *skb)
1294{
1295 struct sock *sk = skb->sk;
1296
1297 atomic_sub(skb->truesize, &sk->sk_rmem_alloc);
3ab224be 1298 sk_mem_uncharge(skb->sk, skb->truesize);
1da177e4 1299}
2a91525c 1300EXPORT_SYMBOL(sock_rfree);
1da177e4
LT		 1301
1302
1303int sock_i_uid(struct sock *sk)
1304{
1305 int uid;
1306
1307 read_lock(&sk->sk_callback_lock);
1308 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : 0;
1309 read_unlock(&sk->sk_callback_lock);
1310 return uid;
1311}
2a91525c 1312EXPORT_SYMBOL(sock_i_uid);
1da177e4
LT		 1313
1314unsigned long sock_i_ino(struct sock *sk)
1315{
1316 unsigned long ino;
1317
1318 read_lock(&sk->sk_callback_lock);
1319 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
1320 read_unlock(&sk->sk_callback_lock);
1321 return ino;
1322}
2a91525c 1323EXPORT_SYMBOL(sock_i_ino);
1da177e4
LT		 1324
1325/*
1326 * Allocate a skb from the socket's send buffer.
1327 */
86a76caf 1328struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
dd0fc66f 1329 gfp_t priority)
1da177e4
LT		 1330{
1331 if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
2a91525c 1332 struct sk_buff *skb = alloc_skb(size, priority);
1da177e4
LT		 1333 if (skb) {
1334 skb_set_owner_w(skb, sk);
1335 return skb;
1336 }
1337 }
1338 return NULL;
1339}
2a91525c 1340EXPORT_SYMBOL(sock_wmalloc);
1da177e4
LT		 1341
1342/*
1343 * Allocate a skb from the socket's receive buffer.
4ec93edb 1344 */
86a76caf 1345struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force,
dd0fc66f 1346 gfp_t priority)
1da177e4
LT		 1347{
1348 if (force || atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) {
1349 struct sk_buff *skb = alloc_skb(size, priority);
1350 if (skb) {
1351 skb_set_owner_r(skb, sk);
1352 return skb;
1353 }
1354 }
1355 return NULL;
1356}
1357
4ec93edb 1358/*
1da177e4 1359 * Allocate a memory block from the socket's option memory buffer.
4ec93edb 1360 */
dd0fc66f 1361void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
1da177e4
LT		 1362{
1363 if ((unsigned)size <= sysctl_optmem_max &&
1364 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) {
1365 void *mem;
1366 /* First do the add, to avoid the race if kmalloc
4ec93edb 1367 * might sleep.
1da177e4
LT		 1368 */
1369 atomic_add(size, &sk->sk_omem_alloc);
1370 mem = kmalloc(size, priority);
1371 if (mem)
1372 return mem;
1373 atomic_sub(size, &sk->sk_omem_alloc);
1374 }
1375 return NULL;
1376}
2a91525c 1377EXPORT_SYMBOL(sock_kmalloc);
1da177e4
LT		 1378
1379/*
1380 * Free an option memory block.
1381 */
1382void sock_kfree_s(struct sock *sk, void *mem, int size)
1383{
1384 kfree(mem);
1385 atomic_sub(size, &sk->sk_omem_alloc);
1386}
2a91525c 1387EXPORT_SYMBOL(sock_kfree_s);
1da177e4
LT		 1388
1389/* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
1390 I think, these locks should be removed for datagram sockets.
1391 */
2a91525c 1392static long sock_wait_for_wmem(struct sock *sk, long timeo)
1da177e4
LT		 1393{
1394 DEFINE_WAIT(wait);
1395
1396 clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1397 for (;;) {
1398 if (!timeo)
1399 break;
1400 if (signal_pending(current))
1401 break;
1402 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
aa395145 1403 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1da177e4
LT		 1404 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf)
1405 break;
1406 if (sk->sk_shutdown & SEND_SHUTDOWN)
1407 break;
1408 if (sk->sk_err)
1409 break;
1410 timeo = schedule_timeout(timeo);
1411 }
aa395145 1412 finish_wait(sk_sleep(sk), &wait);
1da177e4
LT		 1413 return timeo;
1414}
1415
1416
1417/*
1418 * Generic send/receive buffer handlers
1419 */
1420
4cc7f68d
HX		 1421struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len,
1422 unsigned long data_len, int noblock,
1423 int *errcode)
1da177e4
LT		 1424{
1425 struct sk_buff *skb;
7d877f3b 1426 gfp_t gfp_mask;
1da177e4
LT		 1427 long timeo;
1428 int err;
1429
1430 gfp_mask = sk->sk_allocation;
1431 if (gfp_mask & __GFP_WAIT)
1432 gfp_mask |= __GFP_REPEAT;
1433
1434 timeo = sock_sndtimeo(sk, noblock);
1435 while (1) {
1436 err = sock_error(sk);
1437 if (err != 0)
1438 goto failure;
1439
1440 err = -EPIPE;
1441 if (sk->sk_shutdown & SEND_SHUTDOWN)
1442 goto failure;
1443
1444 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
db38c179 1445 skb = alloc_skb(header_len, gfp_mask);
1da177e4
LT		 1446 if (skb) {
1447 int npages;
1448 int i;
1449
1450 /* No pages, we're done... */
1451 if (!data_len)
1452 break;
1453
1454 npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
1455 skb->truesize += data_len;
1456 skb_shinfo(skb)->nr_frags = npages;
1457 for (i = 0; i < npages; i++) {
1458 struct page *page;
1459 skb_frag_t *frag;
1460
1461 page = alloc_pages(sk->sk_allocation, 0);
1462 if (!page) {
1463 err = -ENOBUFS;
1464 skb_shinfo(skb)->nr_frags = i;
1465 kfree_skb(skb);
1466 goto failure;
1467 }
1468
1469 frag = &skb_shinfo(skb)->frags[i];
1470 frag->page = page;
1471 frag->page_offset = 0;
1472 frag->size = (data_len >= PAGE_SIZE ?
1473 PAGE_SIZE :
1474 data_len);
1475 data_len -= PAGE_SIZE;
1476 }
1477
1478 /* Full success... */
1479 break;
1480 }
1481 err = -ENOBUFS;
1482 goto failure;
1483 }
1484 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1485 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1486 err = -EAGAIN;
1487 if (!timeo)
1488 goto failure;
1489 if (signal_pending(current))
1490 goto interrupted;
1491 timeo = sock_wait_for_wmem(sk, timeo);
1492 }
1493
1494 skb_set_owner_w(skb, sk);
1495 return skb;
1496
1497interrupted:
1498 err = sock_intr_errno(timeo);
1499failure:
1500 *errcode = err;
1501 return NULL;
1502}
4cc7f68d 1503EXPORT_SYMBOL(sock_alloc_send_pskb);
1da177e4 1504
4ec93edb 1505struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
1da177e4
LT		 1506 int noblock, int *errcode)
1507{
1508 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode);
1509}
2a91525c 1510EXPORT_SYMBOL(sock_alloc_send_skb);
1da177e4
LT		 1511
1512static void __lock_sock(struct sock *sk)
1513{
1514 DEFINE_WAIT(wait);
1515
e71a4783 1516 for (;;) {
1da177e4
LT		 1517 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
1518 TASK_UNINTERRUPTIBLE);
1519 spin_unlock_bh(&sk->sk_lock.slock);
1520 schedule();
1521 spin_lock_bh(&sk->sk_lock.slock);
e71a4783 1522 if (!sock_owned_by_user(sk))
1da177e4
LT		 1523 break;
1524 }
1525 finish_wait(&sk->sk_lock.wq, &wait);
1526}
1527
1528static void __release_sock(struct sock *sk)
1529{
1530 struct sk_buff *skb = sk->sk_backlog.head;
1531
1532 do {
1533 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
1534 bh_unlock_sock(sk);
1535
1536 do {
1537 struct sk_buff *next = skb->next;
1538
1539 skb->next = NULL;
c57943a1 1540 sk_backlog_rcv(sk, skb);
1da177e4
LT		 1541
1542 /*
1543 * We are in process context here with softirqs
1544 * disabled, use cond_resched_softirq() to preempt.
1545 * This is safe to do because we've taken the backlog
1546 * queue private:
1547 */
1548 cond_resched_softirq();
1549
1550 skb = next;
1551 } while (skb != NULL);
1552
1553 bh_lock_sock(sk);
e71a4783 1554 } while ((skb = sk->sk_backlog.head) != NULL);
8eae939f
ZY		 1555
1556 /*
1557 * Doing the zeroing here guarantee we can not loop forever
1558 * while a wild producer attempts to flood us.
1559 */
1560 sk->sk_backlog.len = 0;
1da177e4
LT		 1561}
1562
1563/**
1564 * sk_wait_data - wait for data to arrive at sk_receive_queue
4dc3b16b
PP		 1565 * @sk: sock to wait on
1566 * @timeo: for how long
1da177e4
LT		 1567 *
1568 * Now socket state including sk->sk_err is changed only under lock,
1569 * hence we may omit checks after joining wait queue.
1570 * We check receive queue before schedule() only as optimization;
1571 * it is very likely that release_sock() added new data.
1572 */
1573int sk_wait_data(struct sock *sk, long *timeo)
1574{
1575 int rc;
1576 DEFINE_WAIT(wait);
1577
aa395145 1578 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1da177e4
LT		 1579 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1580 rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue));
1581 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
aa395145 1582 finish_wait(sk_sleep(sk), &wait);
1da177e4
LT		 1583 return rc;
1584}
1da177e4
LT		 1585EXPORT_SYMBOL(sk_wait_data);
1586
3ab224be
HA		 1587/**
1588 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated
1589 * @sk: socket
1590 * @size: memory size to allocate
1591 * @kind: allocation type
1592 *
1593 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means
1594 * rmem allocation. This function assumes that protocols which have
1595 * memory_pressure use sk_wmem_queued as write buffer accounting.
1596 */
1597int __sk_mem_schedule(struct sock *sk, int size, int kind)
1598{
1599 struct proto *prot = sk->sk_prot;
1600 int amt = sk_mem_pages(size);
1601 int allocated;
1602
1603 sk->sk_forward_alloc += amt * SK_MEM_QUANTUM;
1604 allocated = atomic_add_return(amt, prot->memory_allocated);
1605
1606 /* Under limit. */
1607 if (allocated <= prot->sysctl_mem[0]) {
1608 if (prot->memory_pressure && *prot->memory_pressure)
1609 *prot->memory_pressure = 0;
1610 return 1;
1611 }
1612
1613 /* Under pressure. */
1614 if (allocated > prot->sysctl_mem[1])
1615 if (prot->enter_memory_pressure)
5c52ba17 1616 prot->enter_memory_pressure(sk);
3ab224be
HA		 1617
1618 /* Over hard limit. */
1619 if (allocated > prot->sysctl_mem[2])
1620 goto suppress_allocation;
1621
1622 /* guarantee minimum buffer size under pressure */
1623 if (kind == SK_MEM_RECV) {
1624 if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0])
1625 return 1;
1626 } else { /* SK_MEM_SEND */
1627 if (sk->sk_type == SOCK_STREAM) {
1628 if (sk->sk_wmem_queued < prot->sysctl_wmem[0])
1629 return 1;
1630 } else if (atomic_read(&sk->sk_wmem_alloc) <
1631 prot->sysctl_wmem[0])
1632 return 1;
1633 }
1634
1635 if (prot->memory_pressure) {
1748376b
ED		 1636 int alloc;
1637
1638 if (!*prot->memory_pressure)
1639 return 1;
1640 alloc = percpu_counter_read_positive(prot->sockets_allocated);
1641 if (prot->sysctl_mem[2] > alloc *
3ab224be
HA		 1642 sk_mem_pages(sk->sk_wmem_queued +
1643 atomic_read(&sk->sk_rmem_alloc) +
1644 sk->sk_forward_alloc))
1645 return 1;
1646 }
1647
1648suppress_allocation:
1649
1650 if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) {
1651 sk_stream_moderate_sndbuf(sk);
1652
1653 /* Fail only if socket is _under_ its sndbuf.
1654 * In this case we cannot block, so that we have to fail.
1655 */
1656 if (sk->sk_wmem_queued + size >= sk->sk_sndbuf)
1657 return 1;
1658 }
1659
1660 /* Alas. Undo changes. */
1661 sk->sk_forward_alloc -= amt * SK_MEM_QUANTUM;
1662 atomic_sub(amt, prot->memory_allocated);
1663 return 0;
1664}
3ab224be
HA		 1665EXPORT_SYMBOL(__sk_mem_schedule);
1666
1667/**
1668 * __sk_reclaim - reclaim memory_allocated
1669 * @sk: socket
1670 */
1671void __sk_mem_reclaim(struct sock *sk)
1672{
1673 struct proto *prot = sk->sk_prot;
1674
680a5a50 1675 atomic_sub(sk->sk_forward_alloc >> SK_MEM_QUANTUM_SHIFT,
3ab224be
HA		 1676 prot->memory_allocated);
1677 sk->sk_forward_alloc &= SK_MEM_QUANTUM - 1;
1678
1679 if (prot->memory_pressure && *prot->memory_pressure &&
1680 (atomic_read(prot->memory_allocated) < prot->sysctl_mem[0]))
1681 *prot->memory_pressure = 0;
1682}
3ab224be
HA		 1683EXPORT_SYMBOL(__sk_mem_reclaim);
1684
1685
1da177e4
LT		 1686/*
1687 * Set of default routines for initialising struct proto_ops when
1688 * the protocol does not support a particular function. In certain
1689 * cases where it makes no sense for a protocol to have a "do nothing"
1690 * function, some default processing is provided.
1691 */
1692
1693int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
1694{
1695 return -EOPNOTSUPP;
1696}
2a91525c 1697EXPORT_SYMBOL(sock_no_bind);
1da177e4 1698
4ec93edb 1699int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 1700 int len, int flags)
1701{
1702 return -EOPNOTSUPP;
1703}
2a91525c 1704EXPORT_SYMBOL(sock_no_connect);
1da177e4
LT		 1705
1706int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
1707{
1708 return -EOPNOTSUPP;
1709}
2a91525c 1710EXPORT_SYMBOL(sock_no_socketpair);
1da177e4
LT		 1711
1712int sock_no_accept(struct socket *sock, struct socket *newsock, int flags)
1713{
1714 return -EOPNOTSUPP;
1715}
2a91525c 1716EXPORT_SYMBOL(sock_no_accept);
1da177e4 1717
4ec93edb 1718int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 1719 int *len, int peer)
1720{
1721 return -EOPNOTSUPP;
1722}
2a91525c 1723EXPORT_SYMBOL(sock_no_getname);
1da177e4 1724
2a91525c 1725unsigned int sock_no_poll(struct file *file, struct socket *sock, poll_table *pt)
1da177e4
LT		 1726{
1727 return 0;
1728}
2a91525c 1729EXPORT_SYMBOL(sock_no_poll);
1da177e4
LT		 1730
1731int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1732{
1733 return -EOPNOTSUPP;
1734}
2a91525c 1735EXPORT_SYMBOL(sock_no_ioctl);
1da177e4
LT		 1736
1737int sock_no_listen(struct socket *sock, int backlog)
1738{
1739 return -EOPNOTSUPP;
1740}
2a91525c 1741EXPORT_SYMBOL(sock_no_listen);
1da177e4
LT		 1742
1743int sock_no_shutdown(struct socket *sock, int how)
1744{
1745 return -EOPNOTSUPP;
1746}
2a91525c 1747EXPORT_SYMBOL(sock_no_shutdown);
1da177e4
LT		 1748
1749int sock_no_setsockopt(struct socket *sock, int level, int optname,
b7058842 1750 char __user *optval, unsigned int optlen)
1da177e4
LT		 1751{
1752 return -EOPNOTSUPP;
1753}
2a91525c 1754EXPORT_SYMBOL(sock_no_setsockopt);
1da177e4
LT		 1755
1756int sock_no_getsockopt(struct socket *sock, int level, int optname,
1757 char __user *optval, int __user *optlen)
1758{
1759 return -EOPNOTSUPP;
1760}
2a91525c 1761EXPORT_SYMBOL(sock_no_getsockopt);
1da177e4
LT		 1762
1763int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
1764 size_t len)
1765{
1766 return -EOPNOTSUPP;
1767}
2a91525c 1768EXPORT_SYMBOL(sock_no_sendmsg);
1da177e4
LT		 1769
1770int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
1771 size_t len, int flags)
1772{
1773 return -EOPNOTSUPP;
1774}
2a91525c 1775EXPORT_SYMBOL(sock_no_recvmsg);
1da177e4
LT		 1776
1777int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
1778{
1779 /* Mirror missing mmap method error code */
1780 return -ENODEV;
1781}
2a91525c 1782EXPORT_SYMBOL(sock_no_mmap);
1da177e4
LT		 1783
1784ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
1785{
1786 ssize_t res;
1787 struct msghdr msg = {.msg_flags = flags};
1788 struct kvec iov;
1789 char *kaddr = kmap(page);
1790 iov.iov_base = kaddr + offset;
1791 iov.iov_len = size;
1792 res = kernel_sendmsg(sock, &msg, &iov, 1, size);
1793 kunmap(page);
1794 return res;
1795}
2a91525c 1796EXPORT_SYMBOL(sock_no_sendpage);
1da177e4
LT		 1797
1798/*
1799 * Default Socket Callbacks
1800 */
1801
1802static void sock_def_wakeup(struct sock *sk)
1803{
43815482
ED		 1804 struct socket_wq *wq;
1805
1806 rcu_read_lock();
1807 wq = rcu_dereference(sk->sk_wq);
1808 if (wq_has_sleeper(wq))
1809 wake_up_interruptible_all(&wq->wait);
1810 rcu_read_unlock();
1da177e4
LT		 1811}
1812
1813static void sock_def_error_report(struct sock *sk)
1814{
43815482
ED		 1815 struct socket_wq *wq;
1816
1817 rcu_read_lock();
1818 wq = rcu_dereference(sk->sk_wq);
1819 if (wq_has_sleeper(wq))
1820 wake_up_interruptible_poll(&wq->wait, POLLERR);
8d8ad9d7 1821 sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR);
43815482 1822 rcu_read_unlock();
1da177e4
LT		 1823}
1824
1825static void sock_def_readable(struct sock *sk, int len)
1826{
43815482
ED		 1827 struct socket_wq *wq;
1828
1829 rcu_read_lock();
1830 wq = rcu_dereference(sk->sk_wq);
1831 if (wq_has_sleeper(wq))
1832 wake_up_interruptible_sync_poll(&wq->wait, POLLIN |
37e5540b 1833 POLLRDNORM | POLLRDBAND);
8d8ad9d7 1834 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
43815482 1835 rcu_read_unlock();
1da177e4
LT		 1836}
1837
1838static void sock_def_write_space(struct sock *sk)
1839{
43815482
ED		 1840 struct socket_wq *wq;
1841
1842 rcu_read_lock();
1da177e4
LT		 1843
1844 /* Do not wake up a writer until he can make "significant"
1845 * progress. --DaveM
1846 */
e71a4783 1847 if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) {
43815482
ED		 1848 wq = rcu_dereference(sk->sk_wq);
1849 if (wq_has_sleeper(wq))
1850 wake_up_interruptible_sync_poll(&wq->wait, POLLOUT |
37e5540b 1851 POLLWRNORM | POLLWRBAND);
1da177e4
LT		 1852
1853 /* Should agree with poll, otherwise some programs break */
1854 if (sock_writeable(sk))
8d8ad9d7 1855 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
1da177e4
LT		 1856 }
1857
43815482 1858 rcu_read_unlock();
1da177e4
LT		 1859}
1860
1861static void sock_def_destruct(struct sock *sk)
1862{
a51482bd 1863 kfree(sk->sk_protinfo);
1da177e4
LT		 1864}
1865
1866void sk_send_sigurg(struct sock *sk)
1867{
1868 if (sk->sk_socket && sk->sk_socket->file)
1869 if (send_sigurg(&sk->sk_socket->file->f_owner))
8d8ad9d7 1870 sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI);
1da177e4 1871}
2a91525c 1872EXPORT_SYMBOL(sk_send_sigurg);
1da177e4
LT		 1873
1874void sk_reset_timer(struct sock *sk, struct timer_list* timer,
1875 unsigned long expires)
1876{
1877 if (!mod_timer(timer, expires))
1878 sock_hold(sk);
1879}
1da177e4
LT		 1880EXPORT_SYMBOL(sk_reset_timer);
1881
1882void sk_stop_timer(struct sock *sk, struct timer_list* timer)
1883{
1884 if (timer_pending(timer) && del_timer(timer))
1885 __sock_put(sk);
1886}
1da177e4
LT		 1887EXPORT_SYMBOL(sk_stop_timer);
1888
1889void sock_init_data(struct socket *sock, struct sock *sk)
1890{
1891 skb_queue_head_init(&sk->sk_receive_queue);
1892 skb_queue_head_init(&sk->sk_write_queue);
1893 skb_queue_head_init(&sk->sk_error_queue);
97fc2f08
CL		 1894#ifdef CONFIG_NET_DMA
1895 skb_queue_head_init(&sk->sk_async_wait_queue);
1896#endif
1da177e4
LT		 1897
1898 sk->sk_send_head = NULL;
1899
1900 init_timer(&sk->sk_timer);
4ec93edb 1901
1da177e4
LT		 1902 sk->sk_allocation = GFP_KERNEL;
1903 sk->sk_rcvbuf = sysctl_rmem_default;
1904 sk->sk_sndbuf = sysctl_wmem_default;
1905 sk->sk_state = TCP_CLOSE;
972692e0 1906 sk_set_socket(sk, sock);
1da177e4
LT		 1907
1908 sock_set_flag(sk, SOCK_ZAPPED);
1909
e71a4783 1910 if (sock) {
1da177e4 1911 sk->sk_type = sock->type;
43815482 1912 sk->sk_wq = sock->wq;
1da177e4
LT		 1913 sock->sk = sk;
1914 } else
43815482 1915 sk->sk_wq = NULL;
1da177e4 1916
b6c6712a 1917 spin_lock_init(&sk->sk_dst_lock);
1da177e4 1918 rwlock_init(&sk->sk_callback_lock);
443aef0e
PZ		 1919 lockdep_set_class_and_name(&sk->sk_callback_lock,
1920 af_callback_keys + sk->sk_family,
1921 af_family_clock_key_strings[sk->sk_family]);
1da177e4
LT		 1922
1923 sk->sk_state_change = sock_def_wakeup;
1924 sk->sk_data_ready = sock_def_readable;
1925 sk->sk_write_space = sock_def_write_space;
1926 sk->sk_error_report = sock_def_error_report;
1927 sk->sk_destruct = sock_def_destruct;
1928
1929 sk->sk_sndmsg_page = NULL;
1930 sk->sk_sndmsg_off = 0;
1931
1932 sk->sk_peercred.pid = 0;
1933 sk->sk_peercred.uid = -1;
1934 sk->sk_peercred.gid = -1;
1935 sk->sk_write_pending = 0;
1936 sk->sk_rcvlowat = 1;
1937 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
1938 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
1939
f37f0afb 1940 sk->sk_stamp = ktime_set(-1L, 0);
1da177e4 1941
4dc6dc71
ED		 1942 /*
1943 * Before updating sk_refcnt, we must commit prior changes to memory
1944 * (Documentation/RCU/rculist_nulls.txt for details)
1945 */
1946 smp_wmb();
1da177e4 1947 atomic_set(&sk->sk_refcnt, 1);
33c732c3 1948 atomic_set(&sk->sk_drops, 0);
1da177e4 1949}
2a91525c 1950EXPORT_SYMBOL(sock_init_data);
1da177e4 1951
b5606c2d 1952void lock_sock_nested(struct sock *sk, int subclass)
1da177e4
LT		 1953{
1954 might_sleep();
a5b5bb9a 1955 spin_lock_bh(&sk->sk_lock.slock);
d2e9117c 1956 if (sk->sk_lock.owned)
1da177e4 1957 __lock_sock(sk);
d2e9117c 1958 sk->sk_lock.owned = 1;
a5b5bb9a
IM		 1959 spin_unlock(&sk->sk_lock.slock);
1960 /*
1961 * The sk_lock has mutex_lock() semantics here:
1962 */
fcc70d5f 1963 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
a5b5bb9a 1964 local_bh_enable();
1da177e4 1965}
fcc70d5f 1966EXPORT_SYMBOL(lock_sock_nested);
1da177e4 1967
b5606c2d 1968void release_sock(struct sock *sk)
1da177e4 1969{
a5b5bb9a
IM		 1970 /*
1971 * The sk_lock has mutex_unlock() semantics:
1972 */
1973 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
1974
1975 spin_lock_bh(&sk->sk_lock.slock);
1da177e4
LT		 1976 if (sk->sk_backlog.tail)
1977 __release_sock(sk);
d2e9117c 1978 sk->sk_lock.owned = 0;
a5b5bb9a
IM		 1979 if (waitqueue_active(&sk->sk_lock.wq))
1980 wake_up(&sk->sk_lock.wq);
1981 spin_unlock_bh(&sk->sk_lock.slock);
1da177e4
LT		 1982}
1983EXPORT_SYMBOL(release_sock);
1984
1985int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
4ec93edb 1986{
b7aa0bf7 1987 struct timeval tv;
1da177e4 1988 if (!sock_flag(sk, SOCK_TIMESTAMP))
20d49473 1989 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
b7aa0bf7
ED		 1990 tv = ktime_to_timeval(sk->sk_stamp);
1991 if (tv.tv_sec == -1)
1da177e4 1992 return -ENOENT;
b7aa0bf7
ED		 1993 if (tv.tv_sec == 0) {
1994 sk->sk_stamp = ktime_get_real();
1995 tv = ktime_to_timeval(sk->sk_stamp);
1996 }
1997 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0;
4ec93edb 1998}
1da177e4
LT		 1999EXPORT_SYMBOL(sock_get_timestamp);
2000
ae40eb1e
ED		 2001int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
2002{
2003 struct timespec ts;
2004 if (!sock_flag(sk, SOCK_TIMESTAMP))
20d49473 2005 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
ae40eb1e
ED		 2006 ts = ktime_to_timespec(sk->sk_stamp);
2007 if (ts.tv_sec == -1)
2008 return -ENOENT;
2009 if (ts.tv_sec == 0) {
2010 sk->sk_stamp = ktime_get_real();
2011 ts = ktime_to_timespec(sk->sk_stamp);
2012 }
2013 return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0;
2014}
2015EXPORT_SYMBOL(sock_get_timestampns);
2016
20d49473 2017void sock_enable_timestamp(struct sock *sk, int flag)
4ec93edb 2018{
20d49473
PO		 2019 if (!sock_flag(sk, flag)) {
2020 sock_set_flag(sk, flag);
2021 /*
2022 * we just set one of the two flags which require net
2023 * time stamping, but time stamping might have been on
2024 * already because of the other one
2025 */
2026 if (!sock_flag(sk,
2027 flag == SOCK_TIMESTAMP ?
2028 SOCK_TIMESTAMPING_RX_SOFTWARE :
2029 SOCK_TIMESTAMP))
2030 net_enable_timestamp();
1da177e4
LT		 2031 }
2032}
1da177e4
LT		 2033
2034/*
2035 * Get a socket option on an socket.
2036 *
2037 * FIX: POSIX 1003.1g is very ambiguous here. It states that
2038 * asynchronous errors should be reported by getsockopt. We assume
2039 * this means if you specify SO_ERROR (otherwise whats the point of it).
2040 */
2041int sock_common_getsockopt(struct socket *sock, int level, int optname,
2042 char __user *optval, int __user *optlen)
2043{
2044 struct sock *sk = sock->sk;
2045
2046 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2047}
1da177e4
LT		 2048EXPORT_SYMBOL(sock_common_getsockopt);
2049
3fdadf7d 2050#ifdef CONFIG_COMPAT
543d9cfe
ACM		 2051int compat_sock_common_getsockopt(struct socket *sock, int level, int optname,
2052 char __user *optval, int __user *optlen)
3fdadf7d
DM		 2053{
2054 struct sock *sk = sock->sk;
2055
1e51f951 2056 if (sk->sk_prot->compat_getsockopt != NULL)
543d9cfe
ACM		 2057 return sk->sk_prot->compat_getsockopt(sk, level, optname,
2058 optval, optlen);
3fdadf7d
DM		 2059 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2060}
2061EXPORT_SYMBOL(compat_sock_common_getsockopt);
2062#endif
2063
1da177e4
LT		 2064int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock,
2065 struct msghdr *msg, size_t size, int flags)
2066{
2067 struct sock *sk = sock->sk;
2068 int addr_len = 0;
2069 int err;
2070
2071 err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT,
2072 flags & ~MSG_DONTWAIT, &addr_len);
2073 if (err >= 0)
2074 msg->msg_namelen = addr_len;
2075 return err;
2076}
1da177e4
LT		 2077EXPORT_SYMBOL(sock_common_recvmsg);
2078
2079/*
2080 * Set socket options on an inet socket.
2081 */
2082int sock_common_setsockopt(struct socket *sock, int level, int optname,
b7058842 2083 char __user *optval, unsigned int optlen)
1da177e4
LT		 2084{
2085 struct sock *sk = sock->sk;
2086
2087 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2088}
1da177e4
LT		 2089EXPORT_SYMBOL(sock_common_setsockopt);
2090
3fdadf7d 2091#ifdef CONFIG_COMPAT
543d9cfe 2092int compat_sock_common_setsockopt(struct socket *sock, int level, int optname,
b7058842 2093 char __user *optval, unsigned int optlen)
3fdadf7d
DM		 2094{
2095 struct sock *sk = sock->sk;
2096
543d9cfe
ACM		 2097 if (sk->sk_prot->compat_setsockopt != NULL)
2098 return sk->sk_prot->compat_setsockopt(sk, level, optname,
2099 optval, optlen);
3fdadf7d
DM		 2100 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2101}
2102EXPORT_SYMBOL(compat_sock_common_setsockopt);
2103#endif
2104
1da177e4
LT		 2105void sk_common_release(struct sock *sk)
2106{
2107 if (sk->sk_prot->destroy)
2108 sk->sk_prot->destroy(sk);
2109
2110 /*
2111 * Observation: when sock_common_release is called, processes have
2112 * no access to socket. But net still has.
2113 * Step one, detach it from networking:
2114 *
2115 * A. Remove from hash tables.
2116 */
2117
2118 sk->sk_prot->unhash(sk);
2119
2120 /*
2121 * In this point socket cannot receive new packets, but it is possible
2122 * that some packets are in flight because some CPU runs receiver and
2123 * did hash table lookup before we unhashed socket. They will achieve
2124 * receive queue and will be purged by socket destructor.
2125 *
2126 * Also we still have packets pending on receive queue and probably,
2127 * our own packets waiting in device queues. sock_destroy will drain
2128 * receive queue, but transmitted packets will delay socket destruction
2129 * until the last reference will be released.
2130 */
2131
2132 sock_orphan(sk);
2133
2134 xfrm_sk_free_policy(sk);
2135
e6848976 2136 sk_refcnt_debug_release(sk);
1da177e4
LT		 2137 sock_put(sk);
2138}
1da177e4
LT		 2139EXPORT_SYMBOL(sk_common_release);
2140
2141static DEFINE_RWLOCK(proto_list_lock);
2142static LIST_HEAD(proto_list);
2143
13ff3d6f
PE		 2144#ifdef CONFIG_PROC_FS
2145#define PROTO_INUSE_NR 64 /* should be enough for the first time */
1338d466
PE		 2146struct prot_inuse {
2147 int val[PROTO_INUSE_NR];
2148};
13ff3d6f
PE		 2149
2150static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR);
70ee1159
PE		 2151
2152#ifdef CONFIG_NET_NS
2153void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
2154{
2155 int cpu = smp_processor_id();
2156 per_cpu_ptr(net->core.inuse, cpu)->val[prot->inuse_idx] += val;
2157}
2158EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2159
2160int sock_prot_inuse_get(struct net *net, struct proto *prot)
2161{
2162 int cpu, idx = prot->inuse_idx;
2163 int res = 0;
2164
2165 for_each_possible_cpu(cpu)
2166 res += per_cpu_ptr(net->core.inuse, cpu)->val[idx];
2167
2168 return res >= 0 ? res : 0;
2169}
2170EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
2171
2c8c1e72 2172static int __net_init sock_inuse_init_net(struct net *net)
70ee1159
PE		 2173{
2174 net->core.inuse = alloc_percpu(struct prot_inuse);
2175 return net->core.inuse ? 0 : -ENOMEM;
2176}
2177
2c8c1e72 2178static void __net_exit sock_inuse_exit_net(struct net *net)
70ee1159
PE		 2179{
2180 free_percpu(net->core.inuse);
2181}
2182
2183static struct pernet_operations net_inuse_ops = {
2184 .init = sock_inuse_init_net,
2185 .exit = sock_inuse_exit_net,
2186};
2187
2188static __init int net_inuse_init(void)
2189{
2190 if (register_pernet_subsys(&net_inuse_ops))
2191 panic("Cannot initialize net inuse counters");
2192
2193 return 0;
2194}
2195
2196core_initcall(net_inuse_init);
2197#else
1338d466
PE		 2198static DEFINE_PER_CPU(struct prot_inuse, prot_inuse);
2199
c29a0bc4 2200void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
1338d466
PE		 2201{
2202 __get_cpu_var(prot_inuse).val[prot->inuse_idx] += val;
2203}
2204EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2205
c29a0bc4 2206int sock_prot_inuse_get(struct net *net, struct proto *prot)
1338d466
PE		 2207{
2208 int cpu, idx = prot->inuse_idx;
2209 int res = 0;
2210
2211 for_each_possible_cpu(cpu)
2212 res += per_cpu(prot_inuse, cpu).val[idx];
2213
2214 return res >= 0 ? res : 0;
2215}
2216EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
70ee1159 2217#endif
13ff3d6f
PE		 2218
2219static void assign_proto_idx(struct proto *prot)
2220{
2221 prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR);
2222
2223 if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) {
2224 printk(KERN_ERR "PROTO_INUSE_NR exhausted\n");
2225 return;
2226 }
2227
2228 set_bit(prot->inuse_idx, proto_inuse_idx);
2229}
2230
2231static void release_proto_idx(struct proto *prot)
2232{
2233 if (prot->inuse_idx != PROTO_INUSE_NR - 1)
2234 clear_bit(prot->inuse_idx, proto_inuse_idx);
2235}
2236#else
2237static inline void assign_proto_idx(struct proto *prot)
2238{
2239}
2240
2241static inline void release_proto_idx(struct proto *prot)
2242{
2243}
2244#endif
2245
b733c007
PE		 2246int proto_register(struct proto *prot, int alloc_slab)
2247{
1da177e4
LT		 2248 if (alloc_slab) {
2249 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0,
271b72c7
ED		 2250 SLAB_HWCACHE_ALIGN | prot->slab_flags,
2251 NULL);
1da177e4
LT		 2252
2253 if (prot->slab == NULL) {
2254 printk(KERN_CRIT "%s: Can't create sock SLAB cache!\n",
2255 prot->name);
60e7663d 2256 goto out;
1da177e4 2257 }
2e6599cb
ACM		 2258
2259 if (prot->rsk_prot != NULL) {
faf23422 2260 prot->rsk_prot->slab_name = kasprintf(GFP_KERNEL, "request_sock_%s", prot->name);
7e56b5d6 2261 if (prot->rsk_prot->slab_name == NULL)
2e6599cb
ACM		 2262 goto out_free_sock_slab;
2263
7e56b5d6 2264 prot->rsk_prot->slab = kmem_cache_create(prot->rsk_prot->slab_name,
2e6599cb 2265 prot->rsk_prot->obj_size, 0,
20c2df83 2266 SLAB_HWCACHE_ALIGN, NULL);
2e6599cb
ACM		 2267
2268 if (prot->rsk_prot->slab == NULL) {
2269 printk(KERN_CRIT "%s: Can't create request sock SLAB cache!\n",
2270 prot->name);
2271 goto out_free_request_sock_slab_name;
2272 }
2273 }
8feaf0c0 2274
6d6ee43e 2275 if (prot->twsk_prot != NULL) {
faf23422 2276 prot->twsk_prot->twsk_slab_name = kasprintf(GFP_KERNEL, "tw_sock_%s", prot->name);
8feaf0c0 2277
7e56b5d6 2278 if (prot->twsk_prot->twsk_slab_name == NULL)
8feaf0c0
ACM		 2279 goto out_free_request_sock_slab;
2280
6d6ee43e 2281 prot->twsk_prot->twsk_slab =
7e56b5d6 2282 kmem_cache_create(prot->twsk_prot->twsk_slab_name,
6d6ee43e 2283 prot->twsk_prot->twsk_obj_size,
3ab5aee7
ED		 2284 0,
2285 SLAB_HWCACHE_ALIGN |
2286 prot->slab_flags,
20c2df83 2287 NULL);
6d6ee43e 2288 if (prot->twsk_prot->twsk_slab == NULL)
8feaf0c0
ACM		 2289 goto out_free_timewait_sock_slab_name;
2290 }
1da177e4
LT		 2291 }
2292
2a278051 2293 write_lock(&proto_list_lock);
1da177e4 2294 list_add(&prot->node, &proto_list);
13ff3d6f 2295 assign_proto_idx(prot);
1da177e4 2296 write_unlock(&proto_list_lock);
b733c007
PE		 2297 return 0;
2298
8feaf0c0 2299out_free_timewait_sock_slab_name:
7e56b5d6 2300 kfree(prot->twsk_prot->twsk_slab_name);
8feaf0c0
ACM		 2301out_free_request_sock_slab:
2302 if (prot->rsk_prot && prot->rsk_prot->slab) {
2303 kmem_cache_destroy(prot->rsk_prot->slab);
2304 prot->rsk_prot->slab = NULL;
2305 }
2e6599cb 2306out_free_request_sock_slab_name:
72150e9b
DC		 2307 if (prot->rsk_prot)
2308 kfree(prot->rsk_prot->slab_name);
2e6599cb
ACM		 2309out_free_sock_slab:
2310 kmem_cache_destroy(prot->slab);
2311 prot->slab = NULL;
b733c007
PE		 2312out:
2313 return -ENOBUFS;
1da177e4 2314}
1da177e4
LT		 2315EXPORT_SYMBOL(proto_register);
2316
2317void proto_unregister(struct proto *prot)
2318{
2319 write_lock(&proto_list_lock);
13ff3d6f 2320 release_proto_idx(prot);
0a3f4358
PM		 2321 list_del(&prot->node);
2322 write_unlock(&proto_list_lock);
1da177e4
LT		 2323
2324 if (prot->slab != NULL) {
2325 kmem_cache_destroy(prot->slab);
2326 prot->slab = NULL;
2327 }
2328
2e6599cb 2329 if (prot->rsk_prot != NULL && prot->rsk_prot->slab != NULL) {
2e6599cb 2330 kmem_cache_destroy(prot->rsk_prot->slab);
7e56b5d6 2331 kfree(prot->rsk_prot->slab_name);
2e6599cb
ACM		 2332 prot->rsk_prot->slab = NULL;
2333 }
2334
6d6ee43e 2335 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) {
6d6ee43e 2336 kmem_cache_destroy(prot->twsk_prot->twsk_slab);
7e56b5d6 2337 kfree(prot->twsk_prot->twsk_slab_name);
6d6ee43e 2338 prot->twsk_prot->twsk_slab = NULL;
8feaf0c0 2339 }
1da177e4 2340}
1da177e4
LT		 2341EXPORT_SYMBOL(proto_unregister);
2342
2343#ifdef CONFIG_PROC_FS
1da177e4 2344static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
9a429c49 2345 __acquires(proto_list_lock)
1da177e4
LT		 2346{
2347 read_lock(&proto_list_lock);
60f0438a 2348 return seq_list_start_head(&proto_list, *pos);
1da177e4
LT		 2349}
2350
2351static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2352{
60f0438a 2353 return seq_list_next(v, &proto_list, pos);
1da177e4
LT		 2354}
2355
2356static void proto_seq_stop(struct seq_file *seq, void *v)
9a429c49 2357 __releases(proto_list_lock)
1da177e4
LT		 2358{
2359 read_unlock(&proto_list_lock);
2360}
2361
2362static char proto_method_implemented(const void *method)
2363{
2364 return method == NULL ? 'n' : 'y';
2365}
2366
2367static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
2368{
2369 seq_printf(seq, "%-9s %4u %6d %6d %-3s %6u %-3s %-10s "
2370 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
2371 proto->name,
2372 proto->obj_size,
14e943db 2373 sock_prot_inuse_get(seq_file_net(seq), proto),
1da177e4
LT		 2374 proto->memory_allocated != NULL ? atomic_read(proto->memory_allocated) : -1,
2375 proto->memory_pressure != NULL ? *proto->memory_pressure ? "yes" : "no" : "NI",
2376 proto->max_header,
2377 proto->slab == NULL ? "no" : "yes",
2378 module_name(proto->owner),
2379 proto_method_implemented(proto->close),
2380 proto_method_implemented(proto->connect),
2381 proto_method_implemented(proto->disconnect),
2382 proto_method_implemented(proto->accept),
2383 proto_method_implemented(proto->ioctl),
2384 proto_method_implemented(proto->init),
2385 proto_method_implemented(proto->destroy),
2386 proto_method_implemented(proto->shutdown),
2387 proto_method_implemented(proto->setsockopt),
2388 proto_method_implemented(proto->getsockopt),
2389 proto_method_implemented(proto->sendmsg),
2390 proto_method_implemented(proto->recvmsg),
2391 proto_method_implemented(proto->sendpage),
2392 proto_method_implemented(proto->bind),
2393 proto_method_implemented(proto->backlog_rcv),
2394 proto_method_implemented(proto->hash),
2395 proto_method_implemented(proto->unhash),
2396 proto_method_implemented(proto->get_port),
2397 proto_method_implemented(proto->enter_memory_pressure));
2398}
2399
2400static int proto_seq_show(struct seq_file *seq, void *v)
2401{
60f0438a 2402 if (v == &proto_list)
1da177e4
LT		 2403 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
2404 "protocol",
2405 "size",
2406 "sockets",
2407 "memory",
2408 "press",
2409 "maxhdr",
2410 "slab",
2411 "module",
2412 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
2413 else
60f0438a 2414 proto_seq_printf(seq, list_entry(v, struct proto, node));
1da177e4
LT		 2415 return 0;
2416}
2417
f690808e 2418static const struct seq_operations proto_seq_ops = {
1da177e4
LT		 2419 .start = proto_seq_start,
2420 .next = proto_seq_next,
2421 .stop = proto_seq_stop,
2422 .show = proto_seq_show,
2423};
2424
2425static int proto_seq_open(struct inode *inode, struct file *file)
2426{
14e943db
ED		 2427 return seq_open_net(inode, file, &proto_seq_ops,
2428 sizeof(struct seq_net_private));
1da177e4
LT		 2429}
2430
9a32144e 2431static const struct file_operations proto_seq_fops = {
1da177e4
LT		 2432 .owner = THIS_MODULE,
2433 .open = proto_seq_open,
2434 .read = seq_read,
2435 .llseek = seq_lseek,
14e943db
ED		 2436 .release = seq_release_net,
2437};
2438
2439static __net_init int proto_init_net(struct net *net)
2440{
2441 if (!proc_net_fops_create(net, "protocols", S_IRUGO, &proto_seq_fops))
2442 return -ENOMEM;
2443
2444 return 0;
2445}
2446
2447static __net_exit void proto_exit_net(struct net *net)
2448{
2449 proc_net_remove(net, "protocols");
2450}
2451
2452
2453static __net_initdata struct pernet_operations proto_net_ops = {
2454 .init = proto_init_net,
2455 .exit = proto_exit_net,
1da177e4
LT		 2456};
2457
2458static int __init proto_init(void)
2459{
14e943db 2460 return register_pernet_subsys(&proto_net_ops);
1da177e4
LT		 2461}
2462
2463subsys_initcall(proto_init);
2464
2465#endif /* PROC_FS */
Linux 6.x block layer and io_uring tree(s)