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rndis_wlan: correct multicast_list handling V3
[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
58a5a7b9
ACM		 330 if (nested)
331 bh_lock_sock_nested(sk);
332 else
333 bh_lock_sock(sk);
a5b5bb9a
IM		 334 if (!sock_owned_by_user(sk)) {
335 /*
336 * trylock + unlock semantics:
337 */
338 mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_);
339
c57943a1 340 rc = sk_backlog_rcv(sk, skb);
a5b5bb9a
IM		 341
342 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
343 } else
f0088a50
DV		 344 sk_add_backlog(sk, skb);
345 bh_unlock_sock(sk);
346out:
347 sock_put(sk);
348 return rc;
349discard_and_relse:
350 kfree_skb(skb);
351 goto out;
352}
353EXPORT_SYMBOL(sk_receive_skb);
354
ea94ff3b
KK		 355void sk_reset_txq(struct sock *sk)
356{
357 sk_tx_queue_clear(sk);
358}
359EXPORT_SYMBOL(sk_reset_txq);
360
f0088a50
DV		 361struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie)
362{
363 struct dst_entry *dst = sk->sk_dst_cache;
364
365 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
e022f0b4 366 sk_tx_queue_clear(sk);
f0088a50
DV		 367 sk->sk_dst_cache = NULL;
368 dst_release(dst);
369 return NULL;
370 }
371
372 return dst;
373}
374EXPORT_SYMBOL(__sk_dst_check);
375
376struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie)
377{
378 struct dst_entry *dst = sk_dst_get(sk);
379
380 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
381 sk_dst_reset(sk);
382 dst_release(dst);
383 return NULL;
384 }
385
386 return dst;
387}
388EXPORT_SYMBOL(sk_dst_check);
389
4878809f
DM		 390static int sock_bindtodevice(struct sock *sk, char __user *optval, int optlen)
391{
392 int ret = -ENOPROTOOPT;
393#ifdef CONFIG_NETDEVICES
3b1e0a65 394 struct net *net = sock_net(sk);
4878809f
DM		 395 char devname[IFNAMSIZ];
396 int index;
397
398 /* Sorry... */
399 ret = -EPERM;
400 if (!capable(CAP_NET_RAW))
401 goto out;
402
403 ret = -EINVAL;
404 if (optlen < 0)
405 goto out;
406
407 /* Bind this socket to a particular device like "eth0",
408 * as specified in the passed interface name. If the
409 * name is "" or the option length is zero the socket
410 * is not bound.
411 */
412 if (optlen > IFNAMSIZ - 1)
413 optlen = IFNAMSIZ - 1;
414 memset(devname, 0, sizeof(devname));
415
416 ret = -EFAULT;
417 if (copy_from_user(devname, optval, optlen))
418 goto out;
419
000ba2e4
DM		 420 index = 0;
421 if (devname[0] != '\0') {
bf8e56bf 422 struct net_device *dev;
4878809f 423
bf8e56bf
ED		 424 rcu_read_lock();
425 dev = dev_get_by_name_rcu(net, devname);
426 if (dev)
427 index = dev->ifindex;
428 rcu_read_unlock();
4878809f
DM		 429 ret = -ENODEV;
430 if (!dev)
431 goto out;
4878809f
DM		 432 }
433
434 lock_sock(sk);
435 sk->sk_bound_dev_if = index;
436 sk_dst_reset(sk);
437 release_sock(sk);
438
439 ret = 0;
440
441out:
442#endif
443
444 return ret;
445}
446
c0ef877b
PE		 447static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool)
448{
449 if (valbool)
450 sock_set_flag(sk, bit);
451 else
452 sock_reset_flag(sk, bit);
453}
454
1da177e4
LT		 455/*
456 * This is meant for all protocols to use and covers goings on
457 * at the socket level. Everything here is generic.
458 */
459
460int sock_setsockopt(struct socket *sock, int level, int optname,
b7058842 461 char __user *optval, unsigned int optlen)
1da177e4 462{
2a91525c 463 struct sock *sk = sock->sk;
1da177e4
LT		 464 int val;
465 int valbool;
466 struct linger ling;
467 int ret = 0;
4ec93edb 468
1da177e4
LT		 469 /*
470 * Options without arguments
471 */
472
4878809f
DM		 473 if (optname == SO_BINDTODEVICE)
474 return sock_bindtodevice(sk, optval, optlen);
475
e71a4783
SH		 476 if (optlen < sizeof(int))
477 return -EINVAL;
4ec93edb 478
1da177e4
LT		 479 if (get_user(val, (int __user *)optval))
480 return -EFAULT;
4ec93edb 481
2a91525c 482 valbool = val ? 1 : 0;
1da177e4
LT		 483
484 lock_sock(sk);
485
2a91525c 486 switch (optname) {
e71a4783 487 case SO_DEBUG:
2a91525c 488 if (val && !capable(CAP_NET_ADMIN))
e71a4783 489 ret = -EACCES;
2a91525c 490 else
c0ef877b 491 sock_valbool_flag(sk, SOCK_DBG, valbool);
e71a4783
SH		 492 break;
493 case SO_REUSEADDR:
494 sk->sk_reuse = valbool;
495 break;
496 case SO_TYPE:
49c794e9 497 case SO_PROTOCOL:
0d6038ee 498 case SO_DOMAIN:
e71a4783
SH		 499 case SO_ERROR:
500 ret = -ENOPROTOOPT;
501 break;
502 case SO_DONTROUTE:
c0ef877b 503 sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool);
e71a4783
SH		 504 break;
505 case SO_BROADCAST:
506 sock_valbool_flag(sk, SOCK_BROADCAST, valbool);
507 break;
508 case SO_SNDBUF:
509 /* Don't error on this BSD doesn't and if you think
510 about it this is right. Otherwise apps have to
511 play 'guess the biggest size' games. RCVBUF/SNDBUF
512 are treated in BSD as hints */
513
514 if (val > sysctl_wmem_max)
515 val = sysctl_wmem_max;
b0573dea 516set_sndbuf:
e71a4783
SH		 517 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
518 if ((val * 2) < SOCK_MIN_SNDBUF)
519 sk->sk_sndbuf = SOCK_MIN_SNDBUF;
520 else
521 sk->sk_sndbuf = val * 2;
1da177e4 522
e71a4783
SH		 523 /*
524 * Wake up sending tasks if we
525 * upped the value.
526 */
527 sk->sk_write_space(sk);
528 break;
1da177e4 529
e71a4783
SH		 530 case SO_SNDBUFFORCE:
531 if (!capable(CAP_NET_ADMIN)) {
532 ret = -EPERM;
533 break;
534 }
535 goto set_sndbuf;
b0573dea 536
e71a4783
SH		 537 case SO_RCVBUF:
538 /* Don't error on this BSD doesn't and if you think
539 about it this is right. Otherwise apps have to
540 play 'guess the biggest size' games. RCVBUF/SNDBUF
541 are treated in BSD as hints */
4ec93edb 542
e71a4783
SH		 543 if (val > sysctl_rmem_max)
544 val = sysctl_rmem_max;
b0573dea 545set_rcvbuf:
e71a4783
SH		 546 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
547 /*
548 * We double it on the way in to account for
549 * "struct sk_buff" etc. overhead. Applications
550 * assume that the SO_RCVBUF setting they make will
551 * allow that much actual data to be received on that
552 * socket.
553 *
554 * Applications are unaware that "struct sk_buff" and
555 * other overheads allocate from the receive buffer
556 * during socket buffer allocation.
557 *
558 * And after considering the possible alternatives,
559 * returning the value we actually used in getsockopt
560 * is the most desirable behavior.
561 */
562 if ((val * 2) < SOCK_MIN_RCVBUF)
563 sk->sk_rcvbuf = SOCK_MIN_RCVBUF;
564 else
565 sk->sk_rcvbuf = val * 2;
566 break;
567
568 case SO_RCVBUFFORCE:
569 if (!capable(CAP_NET_ADMIN)) {
570 ret = -EPERM;
1da177e4 571 break;
e71a4783
SH		 572 }
573 goto set_rcvbuf;
1da177e4 574
e71a4783 575 case SO_KEEPALIVE:
1da177e4 576#ifdef CONFIG_INET
e71a4783
SH		 577 if (sk->sk_protocol == IPPROTO_TCP)
578 tcp_set_keepalive(sk, valbool);
1da177e4 579#endif
e71a4783
SH		 580 sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool);
581 break;
582
583 case SO_OOBINLINE:
584 sock_valbool_flag(sk, SOCK_URGINLINE, valbool);
585 break;
586
587 case SO_NO_CHECK:
588 sk->sk_no_check = valbool;
589 break;
590
591 case SO_PRIORITY:
592 if ((val >= 0 && val <= 6) || capable(CAP_NET_ADMIN))
593 sk->sk_priority = val;
594 else
595 ret = -EPERM;
596 break;
597
598 case SO_LINGER:
599 if (optlen < sizeof(ling)) {
600 ret = -EINVAL; /* 1003.1g */
1da177e4 601 break;
e71a4783 602 }
2a91525c 603 if (copy_from_user(&ling, optval, sizeof(ling))) {
e71a4783 604 ret = -EFAULT;
1da177e4 605 break;
e71a4783
SH		 606 }
607 if (!ling.l_onoff)
608 sock_reset_flag(sk, SOCK_LINGER);
609 else {
1da177e4 610#if (BITS_PER_LONG == 32)
e71a4783
SH		 611 if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ)
612 sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT;
1da177e4 613 else
e71a4783
SH		 614#endif
615 sk->sk_lingertime = (unsigned int)ling.l_linger * HZ;
616 sock_set_flag(sk, SOCK_LINGER);
617 }
618 break;
619
620 case SO_BSDCOMPAT:
621 sock_warn_obsolete_bsdism("setsockopt");
622 break;
623
624 case SO_PASSCRED:
625 if (valbool)
626 set_bit(SOCK_PASSCRED, &sock->flags);
627 else
628 clear_bit(SOCK_PASSCRED, &sock->flags);
629 break;
630
631 case SO_TIMESTAMP:
92f37fd2 632 case SO_TIMESTAMPNS:
e71a4783 633 if (valbool) {
92f37fd2
ED		 634 if (optname == SO_TIMESTAMP)
635 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
636 else
637 sock_set_flag(sk, SOCK_RCVTSTAMPNS);
e71a4783 638 sock_set_flag(sk, SOCK_RCVTSTAMP);
20d49473 639 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
92f37fd2 640 } else {
e71a4783 641 sock_reset_flag(sk, SOCK_RCVTSTAMP);
92f37fd2
ED		 642 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
643 }
e71a4783
SH		 644 break;
645
20d49473
PO		 646 case SO_TIMESTAMPING:
647 if (val & ~SOF_TIMESTAMPING_MASK) {
f249fb78 648 ret = -EINVAL;
20d49473
PO		 649 break;
650 }
651 sock_valbool_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE,
652 val & SOF_TIMESTAMPING_TX_HARDWARE);
653 sock_valbool_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE,
654 val & SOF_TIMESTAMPING_TX_SOFTWARE);
655 sock_valbool_flag(sk, SOCK_TIMESTAMPING_RX_HARDWARE,
656 val & SOF_TIMESTAMPING_RX_HARDWARE);
657 if (val & SOF_TIMESTAMPING_RX_SOFTWARE)
658 sock_enable_timestamp(sk,
659 SOCK_TIMESTAMPING_RX_SOFTWARE);
660 else
661 sock_disable_timestamp(sk,
662 SOCK_TIMESTAMPING_RX_SOFTWARE);
663 sock_valbool_flag(sk, SOCK_TIMESTAMPING_SOFTWARE,
664 val & SOF_TIMESTAMPING_SOFTWARE);
665 sock_valbool_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE,
666 val & SOF_TIMESTAMPING_SYS_HARDWARE);
667 sock_valbool_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE,
668 val & SOF_TIMESTAMPING_RAW_HARDWARE);
669 break;
670
e71a4783
SH		 671 case SO_RCVLOWAT:
672 if (val < 0)
673 val = INT_MAX;
674 sk->sk_rcvlowat = val ? : 1;
675 break;
676
677 case SO_RCVTIMEO:
678 ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen);
679 break;
680
681 case SO_SNDTIMEO:
682 ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen);
683 break;
1da177e4 684
e71a4783
SH		 685 case SO_ATTACH_FILTER:
686 ret = -EINVAL;
687 if (optlen == sizeof(struct sock_fprog)) {
688 struct sock_fprog fprog;
1da177e4 689
e71a4783
SH		 690 ret = -EFAULT;
691 if (copy_from_user(&fprog, optval, sizeof(fprog)))
1da177e4 692 break;
e71a4783
SH		 693
694 ret = sk_attach_filter(&fprog, sk);
695 }
696 break;
697
698 case SO_DETACH_FILTER:
55b33325 699 ret = sk_detach_filter(sk);
e71a4783 700 break;
1da177e4 701
e71a4783
SH		 702 case SO_PASSSEC:
703 if (valbool)
704 set_bit(SOCK_PASSSEC, &sock->flags);
705 else
706 clear_bit(SOCK_PASSSEC, &sock->flags);
707 break;
4a19ec58
LAT		 708 case SO_MARK:
709 if (!capable(CAP_NET_ADMIN))
710 ret = -EPERM;
2a91525c 711 else
4a19ec58 712 sk->sk_mark = val;
4a19ec58 713 break;
877ce7c1 714
1da177e4
LT		 715 /* We implement the SO_SNDLOWAT etc to
716 not be settable (1003.1g 5.3) */
3b885787
NH		 717 case SO_RXQ_OVFL:
718 if (valbool)
719 sock_set_flag(sk, SOCK_RXQ_OVFL);
720 else
721 sock_reset_flag(sk, SOCK_RXQ_OVFL);
722 break;
e71a4783
SH		 723 default:
724 ret = -ENOPROTOOPT;
725 break;
4ec93edb 726 }
1da177e4
LT		 727 release_sock(sk);
728 return ret;
729}
2a91525c 730EXPORT_SYMBOL(sock_setsockopt);
1da177e4
LT		 731
732
733int sock_getsockopt(struct socket *sock, int level, int optname,
734 char __user *optval, int __user *optlen)
735{
736 struct sock *sk = sock->sk;
4ec93edb 737
e71a4783 738 union {
4ec93edb
YH		 739 int val;
740 struct linger ling;
1da177e4
LT		 741 struct timeval tm;
742 } v;
4ec93edb 743
4d0392be 744 int lv = sizeof(int);
1da177e4 745 int len;
4ec93edb 746
e71a4783 747 if (get_user(len, optlen))
4ec93edb 748 return -EFAULT;
e71a4783 749 if (len < 0)
1da177e4 750 return -EINVAL;
4ec93edb 751
50fee1de 752 memset(&v, 0, sizeof(v));
df0bca04 753
2a91525c 754 switch (optname) {
e71a4783
SH		 755 case SO_DEBUG:
756 v.val = sock_flag(sk, SOCK_DBG);
757 break;
758
759 case SO_DONTROUTE:
760 v.val = sock_flag(sk, SOCK_LOCALROUTE);
761 break;
762
763 case SO_BROADCAST:
764 v.val = !!sock_flag(sk, SOCK_BROADCAST);
765 break;
766
767 case SO_SNDBUF:
768 v.val = sk->sk_sndbuf;
769 break;
770
771 case SO_RCVBUF:
772 v.val = sk->sk_rcvbuf;
773 break;
774
775 case SO_REUSEADDR:
776 v.val = sk->sk_reuse;
777 break;
778
779 case SO_KEEPALIVE:
780 v.val = !!sock_flag(sk, SOCK_KEEPOPEN);
781 break;
782
783 case SO_TYPE:
784 v.val = sk->sk_type;
785 break;
786
49c794e9
JE		 787 case SO_PROTOCOL:
788 v.val = sk->sk_protocol;
789 break;
790
0d6038ee
JE		 791 case SO_DOMAIN:
792 v.val = sk->sk_family;
793 break;
794
e71a4783
SH		 795 case SO_ERROR:
796 v.val = -sock_error(sk);
2a91525c 797 if (v.val == 0)
e71a4783
SH		 798 v.val = xchg(&sk->sk_err_soft, 0);
799 break;
800
801 case SO_OOBINLINE:
802 v.val = !!sock_flag(sk, SOCK_URGINLINE);
803 break;
804
805 case SO_NO_CHECK:
806 v.val = sk->sk_no_check;
807 break;
808
809 case SO_PRIORITY:
810 v.val = sk->sk_priority;
811 break;
812
813 case SO_LINGER:
814 lv = sizeof(v.ling);
815 v.ling.l_onoff = !!sock_flag(sk, SOCK_LINGER);
816 v.ling.l_linger = sk->sk_lingertime / HZ;
817 break;
818
819 case SO_BSDCOMPAT:
820 sock_warn_obsolete_bsdism("getsockopt");
821 break;
822
823 case SO_TIMESTAMP:
92f37fd2
ED		 824 v.val = sock_flag(sk, SOCK_RCVTSTAMP) &&
825 !sock_flag(sk, SOCK_RCVTSTAMPNS);
826 break;
827
828 case SO_TIMESTAMPNS:
829 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS);
e71a4783
SH		 830 break;
831
20d49473
PO		 832 case SO_TIMESTAMPING:
833 v.val = 0;
834 if (sock_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE))
835 v.val |= SOF_TIMESTAMPING_TX_HARDWARE;
836 if (sock_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE))
837 v.val |= SOF_TIMESTAMPING_TX_SOFTWARE;
838 if (sock_flag(sk, SOCK_TIMESTAMPING_RX_HARDWARE))
839 v.val |= SOF_TIMESTAMPING_RX_HARDWARE;
840 if (sock_flag(sk, SOCK_TIMESTAMPING_RX_SOFTWARE))
841 v.val |= SOF_TIMESTAMPING_RX_SOFTWARE;
842 if (sock_flag(sk, SOCK_TIMESTAMPING_SOFTWARE))
843 v.val |= SOF_TIMESTAMPING_SOFTWARE;
844 if (sock_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE))
845 v.val |= SOF_TIMESTAMPING_SYS_HARDWARE;
846 if (sock_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE))
847 v.val |= SOF_TIMESTAMPING_RAW_HARDWARE;
848 break;
849
e71a4783 850 case SO_RCVTIMEO:
2a91525c 851 lv = sizeof(struct timeval);
e71a4783
SH		 852 if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) {
853 v.tm.tv_sec = 0;
854 v.tm.tv_usec = 0;
855 } else {
856 v.tm.tv_sec = sk->sk_rcvtimeo / HZ;
857 v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ;
858 }
859 break;
860
861 case SO_SNDTIMEO:
2a91525c 862 lv = sizeof(struct timeval);
e71a4783
SH		 863 if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) {
864 v.tm.tv_sec = 0;
865 v.tm.tv_usec = 0;
866 } else {
867 v.tm.tv_sec = sk->sk_sndtimeo / HZ;
868 v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ;
869 }
870 break;
1da177e4 871
e71a4783
SH		 872 case SO_RCVLOWAT:
873 v.val = sk->sk_rcvlowat;
874 break;
1da177e4 875
e71a4783 876 case SO_SNDLOWAT:
2a91525c 877 v.val = 1;
e71a4783 878 break;
1da177e4 879
e71a4783
SH		 880 case SO_PASSCRED:
881 v.val = test_bit(SOCK_PASSCRED, &sock->flags) ? 1 : 0;
882 break;
1da177e4 883
e71a4783
SH		 884 case SO_PEERCRED:
885 if (len > sizeof(sk->sk_peercred))
886 len = sizeof(sk->sk_peercred);
887 if (copy_to_user(optval, &sk->sk_peercred, len))
888 return -EFAULT;
889 goto lenout;
1da177e4 890
e71a4783
SH		 891 case SO_PEERNAME:
892 {
893 char address[128];
894
895 if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2))
896 return -ENOTCONN;
897 if (lv < len)
898 return -EINVAL;
899 if (copy_to_user(optval, address, len))
900 return -EFAULT;
901 goto lenout;
902 }
1da177e4 903
e71a4783
SH		 904 /* Dubious BSD thing... Probably nobody even uses it, but
905 * the UNIX standard wants it for whatever reason... -DaveM
906 */
907 case SO_ACCEPTCONN:
908 v.val = sk->sk_state == TCP_LISTEN;
909 break;
1da177e4 910
e71a4783
SH		 911 case SO_PASSSEC:
912 v.val = test_bit(SOCK_PASSSEC, &sock->flags) ? 1 : 0;
913 break;
877ce7c1 914
e71a4783
SH		 915 case SO_PEERSEC:
916 return security_socket_getpeersec_stream(sock, optval, optlen, len);
1da177e4 917
4a19ec58
LAT		 918 case SO_MARK:
919 v.val = sk->sk_mark;
920 break;
921
3b885787
NH		 922 case SO_RXQ_OVFL:
923 v.val = !!sock_flag(sk, SOCK_RXQ_OVFL);
924 break;
925
e71a4783
SH		 926 default:
927 return -ENOPROTOOPT;
1da177e4 928 }
e71a4783 929
1da177e4
LT		 930 if (len > lv)
931 len = lv;
932 if (copy_to_user(optval, &v, len))
933 return -EFAULT;
934lenout:
4ec93edb
YH		 935 if (put_user(len, optlen))
936 return -EFAULT;
937 return 0;
1da177e4
LT		 938}
939
a5b5bb9a
IM		 940/*
941 * Initialize an sk_lock.
942 *
943 * (We also register the sk_lock with the lock validator.)
944 */
b6f99a21 945static inline void sock_lock_init(struct sock *sk)
a5b5bb9a 946{
ed07536e
PZ		 947 sock_lock_init_class_and_name(sk,
948 af_family_slock_key_strings[sk->sk_family],
949 af_family_slock_keys + sk->sk_family,
950 af_family_key_strings[sk->sk_family],
951 af_family_keys + sk->sk_family);
a5b5bb9a
IM		 952}
953
4dc6dc71
ED		 954/*
955 * Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet,
956 * even temporarly, because of RCU lookups. sk_node should also be left as is.
957 */
f1a6c4da
PE		 958static void sock_copy(struct sock *nsk, const struct sock *osk)
959{
960#ifdef CONFIG_SECURITY_NETWORK
961 void *sptr = nsk->sk_security;
962#endif
4dc6dc71 963 BUILD_BUG_ON(offsetof(struct sock, sk_copy_start) !=
e022f0b4
KK		 964 sizeof(osk->sk_node) + sizeof(osk->sk_refcnt) +
965 sizeof(osk->sk_tx_queue_mapping));
4dc6dc71
ED		 966 memcpy(&nsk->sk_copy_start, &osk->sk_copy_start,
967 osk->sk_prot->obj_size - offsetof(struct sock, sk_copy_start));
f1a6c4da
PE		 968#ifdef CONFIG_SECURITY_NETWORK
969 nsk->sk_security = sptr;
970 security_sk_clone(osk, nsk);
971#endif
972}
973
2e4afe7b
PE		 974static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority,
975 int family)
c308c1b2
PE		 976{
977 struct sock *sk;
978 struct kmem_cache *slab;
979
980 slab = prot->slab;
e912b114
ED		 981 if (slab != NULL) {
982 sk = kmem_cache_alloc(slab, priority & ~__GFP_ZERO);
983 if (!sk)
984 return sk;
985 if (priority & __GFP_ZERO) {
986 /*
987 * caches using SLAB_DESTROY_BY_RCU should let
988 * sk_node.next un-modified. Special care is taken
989 * when initializing object to zero.
990 */
991 if (offsetof(struct sock, sk_node.next) != 0)
992 memset(sk, 0, offsetof(struct sock, sk_node.next));
993 memset(&sk->sk_node.pprev, 0,
994 prot->obj_size - offsetof(struct sock,
995 sk_node.pprev));
996 }
997 }
c308c1b2
PE		 998 else
999 sk = kmalloc(prot->obj_size, priority);
1000
2e4afe7b 1001 if (sk != NULL) {
a98b65a3
VN		 1002 kmemcheck_annotate_bitfield(sk, flags);
1003
2e4afe7b
PE		 1004 if (security_sk_alloc(sk, family, priority))
1005 goto out_free;
1006
1007 if (!try_module_get(prot->owner))
1008 goto out_free_sec;
e022f0b4 1009 sk_tx_queue_clear(sk);
2e4afe7b
PE		 1010 }
1011
c308c1b2 1012 return sk;
2e4afe7b
PE		 1013
1014out_free_sec:
1015 security_sk_free(sk);
1016out_free:
1017 if (slab != NULL)
1018 kmem_cache_free(slab, sk);
1019 else
1020 kfree(sk);
1021 return NULL;
c308c1b2
PE		 1022}
1023
1024static void sk_prot_free(struct proto *prot, struct sock *sk)
1025{
1026 struct kmem_cache *slab;
2e4afe7b 1027 struct module *owner;
c308c1b2 1028
2e4afe7b 1029 owner = prot->owner;
c308c1b2 1030 slab = prot->slab;
2e4afe7b
PE		 1031
1032 security_sk_free(sk);
c308c1b2
PE		 1033 if (slab != NULL)
1034 kmem_cache_free(slab, sk);
1035 else
1036 kfree(sk);
2e4afe7b 1037 module_put(owner);
c308c1b2
PE		 1038}
1039
1da177e4
LT		 1040/**
1041 * sk_alloc - All socket objects are allocated here
c4ea43c5 1042 * @net: the applicable net namespace
4dc3b16b
PP		 1043 * @family: protocol family
1044 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1045 * @prot: struct proto associated with this new sock instance
1da177e4 1046 */
1b8d7ae4 1047struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
6257ff21 1048 struct proto *prot)
1da177e4 1049{
c308c1b2 1050 struct sock *sk;
1da177e4 1051
154adbc8 1052 sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family);
1da177e4 1053 if (sk) {
154adbc8
PE		 1054 sk->sk_family = family;
1055 /*
1056 * See comment in struct sock definition to understand
1057 * why we need sk_prot_creator -acme
1058 */
1059 sk->sk_prot = sk->sk_prot_creator = prot;
1060 sock_lock_init(sk);
3b1e0a65 1061 sock_net_set(sk, get_net(net));
d66ee058 1062 atomic_set(&sk->sk_wmem_alloc, 1);
1da177e4 1063 }
a79af59e 1064
2e4afe7b 1065 return sk;
1da177e4 1066}
2a91525c 1067EXPORT_SYMBOL(sk_alloc);
1da177e4 1068
2b85a34e 1069static void __sk_free(struct sock *sk)
1da177e4
LT		 1070{
1071 struct sk_filter *filter;
1da177e4
LT		 1072
1073 if (sk->sk_destruct)
1074 sk->sk_destruct(sk);
1075
a898def2
PM		 1076 filter = rcu_dereference_check(sk->sk_filter,
1077 atomic_read(&sk->sk_wmem_alloc) == 0);
1da177e4 1078 if (filter) {
309dd5fc 1079 sk_filter_uncharge(sk, filter);
fda9ef5d 1080 rcu_assign_pointer(sk->sk_filter, NULL);
1da177e4
LT		 1081 }
1082
20d49473
PO		 1083 sock_disable_timestamp(sk, SOCK_TIMESTAMP);
1084 sock_disable_timestamp(sk, SOCK_TIMESTAMPING_RX_SOFTWARE);
1da177e4
LT		 1085
1086 if (atomic_read(&sk->sk_omem_alloc))
1087 printk(KERN_DEBUG "%s: optmem leakage (%d bytes) detected.\n",
0dc47877 1088 __func__, atomic_read(&sk->sk_omem_alloc));
1da177e4 1089
3b1e0a65 1090 put_net(sock_net(sk));
c308c1b2 1091 sk_prot_free(sk->sk_prot_creator, sk);
1da177e4 1092}
2b85a34e
ED		 1093
1094void sk_free(struct sock *sk)
1095{
1096 /*
1097 * We substract one from sk_wmem_alloc and can know if
1098 * some packets are still in some tx queue.
1099 * If not null, sock_wfree() will call __sk_free(sk) later
1100 */
1101 if (atomic_dec_and_test(&sk->sk_wmem_alloc))
1102 __sk_free(sk);
1103}
2a91525c 1104EXPORT_SYMBOL(sk_free);
1da177e4 1105
edf02087
DL		 1106/*
1107 * Last sock_put should drop referrence to sk->sk_net. It has already
1108 * been dropped in sk_change_net. Taking referrence to stopping namespace
1109 * is not an option.
1110 * Take referrence to a socket to remove it from hash _alive_ and after that
1111 * destroy it in the context of init_net.
1112 */
1113void sk_release_kernel(struct sock *sk)
1114{
1115 if (sk == NULL || sk->sk_socket == NULL)
1116 return;
1117
1118 sock_hold(sk);
1119 sock_release(sk->sk_socket);
65a18ec5 1120 release_net(sock_net(sk));
3b1e0a65 1121 sock_net_set(sk, get_net(&init_net));
edf02087
DL		 1122 sock_put(sk);
1123}
45af1754 1124EXPORT_SYMBOL(sk_release_kernel);
edf02087 1125
dd0fc66f 1126struct sock *sk_clone(const struct sock *sk, const gfp_t priority)
87d11ceb 1127{
8fd1d178 1128 struct sock *newsk;
87d11ceb 1129
8fd1d178 1130 newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family);
87d11ceb
ACM		 1131 if (newsk != NULL) {
1132 struct sk_filter *filter;
1133
892c141e 1134 sock_copy(newsk, sk);
87d11ceb
ACM		 1135
1136 /* SANITY */
3b1e0a65 1137 get_net(sock_net(newsk));
87d11ceb
ACM		 1138 sk_node_init(&newsk->sk_node);
1139 sock_lock_init(newsk);
1140 bh_lock_sock(newsk);
fa438ccf 1141 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL;
87d11ceb
ACM		 1142
1143 atomic_set(&newsk->sk_rmem_alloc, 0);
2b85a34e
ED		 1144 /*
1145 * sk_wmem_alloc set to one (see sk_free() and sock_wfree())
1146 */
1147 atomic_set(&newsk->sk_wmem_alloc, 1);
87d11ceb
ACM		 1148 atomic_set(&newsk->sk_omem_alloc, 0);
1149 skb_queue_head_init(&newsk->sk_receive_queue);
1150 skb_queue_head_init(&newsk->sk_write_queue);
97fc2f08
CL		 1151#ifdef CONFIG_NET_DMA
1152 skb_queue_head_init(&newsk->sk_async_wait_queue);
1153#endif
87d11ceb
ACM		 1154
1155 rwlock_init(&newsk->sk_dst_lock);
1156 rwlock_init(&newsk->sk_callback_lock);
443aef0e
PZ		 1157 lockdep_set_class_and_name(&newsk->sk_callback_lock,
1158 af_callback_keys + newsk->sk_family,
1159 af_family_clock_key_strings[newsk->sk_family]);
87d11ceb
ACM		 1160
1161 newsk->sk_dst_cache = NULL;
1162 newsk->sk_wmem_queued = 0;
1163 newsk->sk_forward_alloc = 0;
1164 newsk->sk_send_head = NULL;
87d11ceb
ACM		 1165 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
1166
1167 sock_reset_flag(newsk, SOCK_DONE);
1168 skb_queue_head_init(&newsk->sk_error_queue);
1169
1170 filter = newsk->sk_filter;
1171 if (filter != NULL)
1172 sk_filter_charge(newsk, filter);
1173
1174 if (unlikely(xfrm_sk_clone_policy(newsk))) {
1175 /* It is still raw copy of parent, so invalidate
1176 * destructor and make plain sk_free() */
1177 newsk->sk_destruct = NULL;
1178 sk_free(newsk);
1179 newsk = NULL;
1180 goto out;
1181 }
1182
1183 newsk->sk_err = 0;
1184 newsk->sk_priority = 0;
4dc6dc71
ED		 1185 /*
1186 * Before updating sk_refcnt, we must commit prior changes to memory
1187 * (Documentation/RCU/rculist_nulls.txt for details)
1188 */
1189 smp_wmb();
87d11ceb
ACM		 1190 atomic_set(&newsk->sk_refcnt, 2);
1191
1192 /*
1193 * Increment the counter in the same struct proto as the master
1194 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
1195 * is the same as sk->sk_prot->socks, as this field was copied
1196 * with memcpy).
1197 *
1198 * This _changes_ the previous behaviour, where
1199 * tcp_create_openreq_child always was incrementing the
1200 * equivalent to tcp_prot->socks (inet_sock_nr), so this have
1201 * to be taken into account in all callers. -acme
1202 */
1203 sk_refcnt_debug_inc(newsk);
972692e0 1204 sk_set_socket(newsk, NULL);
87d11ceb
ACM		 1205 newsk->sk_sleep = NULL;
1206
1207 if (newsk->sk_prot->sockets_allocated)
1748376b 1208 percpu_counter_inc(newsk->sk_prot->sockets_allocated);
704da560
OP		 1209
1210 if (sock_flag(newsk, SOCK_TIMESTAMP) ||
1211 sock_flag(newsk, SOCK_TIMESTAMPING_RX_SOFTWARE))
1212 net_enable_timestamp();
87d11ceb
ACM		 1213 }
1214out:
1215 return newsk;
1216}
87d11ceb
ACM		 1217EXPORT_SYMBOL_GPL(sk_clone);
1218
9958089a
AK		 1219void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
1220{
1221 __sk_dst_set(sk, dst);
1222 sk->sk_route_caps = dst->dev->features;
1223 if (sk->sk_route_caps & NETIF_F_GSO)
4fcd6b99 1224 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE;
9958089a 1225 if (sk_can_gso(sk)) {
82cc1a7a 1226 if (dst->header_len) {
9958089a 1227 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
82cc1a7a 1228 } else {
9958089a 1229 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
82cc1a7a
PWJ		 1230 sk->sk_gso_max_size = dst->dev->gso_max_size;
1231 }
9958089a
AK		 1232 }
1233}
1234EXPORT_SYMBOL_GPL(sk_setup_caps);
1235
1da177e4
LT		 1236void __init sk_init(void)
1237{
4481374c 1238 if (totalram_pages <= 4096) {
1da177e4
LT		 1239 sysctl_wmem_max = 32767;
1240 sysctl_rmem_max = 32767;
1241 sysctl_wmem_default = 32767;
1242 sysctl_rmem_default = 32767;
4481374c 1243 } else if (totalram_pages >= 131072) {
1da177e4
LT		 1244 sysctl_wmem_max = 131071;
1245 sysctl_rmem_max = 131071;
1246 }
1247}
1248
1249/*
1250 * Simple resource managers for sockets.
1251 */
1252
1253
4ec93edb
YH		 1254/*
1255 * Write buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1256 */
1257void sock_wfree(struct sk_buff *skb)
1258{
1259 struct sock *sk = skb->sk;
d99927f4 1260 unsigned int len = skb->truesize;
1da177e4 1261
d99927f4
ED		 1262 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) {
1263 /*
1264 * Keep a reference on sk_wmem_alloc, this will be released
1265 * after sk_write_space() call
1266 */
1267 atomic_sub(len - 1, &sk->sk_wmem_alloc);
1da177e4 1268 sk->sk_write_space(sk);
d99927f4
ED		 1269 len = 1;
1270 }
2b85a34e 1271 /*
d99927f4
ED		 1272 * if sk_wmem_alloc reaches 0, we must finish what sk_free()
1273 * could not do because of in-flight packets
2b85a34e 1274 */
d99927f4 1275 if (atomic_sub_and_test(len, &sk->sk_wmem_alloc))
2b85a34e 1276 __sk_free(sk);
1da177e4 1277}
2a91525c 1278EXPORT_SYMBOL(sock_wfree);
1da177e4 1279
4ec93edb
YH		 1280/*
1281 * Read buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1282 */
1283void sock_rfree(struct sk_buff *skb)
1284{
1285 struct sock *sk = skb->sk;
1286
1287 atomic_sub(skb->truesize, &sk->sk_rmem_alloc);
3ab224be 1288 sk_mem_uncharge(skb->sk, skb->truesize);
1da177e4 1289}
2a91525c 1290EXPORT_SYMBOL(sock_rfree);
1da177e4
LT		 1291
1292
1293int sock_i_uid(struct sock *sk)
1294{
1295 int uid;
1296
1297 read_lock(&sk->sk_callback_lock);
1298 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : 0;
1299 read_unlock(&sk->sk_callback_lock);
1300 return uid;
1301}
2a91525c 1302EXPORT_SYMBOL(sock_i_uid);
1da177e4
LT		 1303
1304unsigned long sock_i_ino(struct sock *sk)
1305{
1306 unsigned long ino;
1307
1308 read_lock(&sk->sk_callback_lock);
1309 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
1310 read_unlock(&sk->sk_callback_lock);
1311 return ino;
1312}
2a91525c 1313EXPORT_SYMBOL(sock_i_ino);
1da177e4
LT		 1314
1315/*
1316 * Allocate a skb from the socket's send buffer.
1317 */
86a76caf 1318struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
dd0fc66f 1319 gfp_t priority)
1da177e4
LT		 1320{
1321 if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
2a91525c 1322 struct sk_buff *skb = alloc_skb(size, priority);
1da177e4
LT		 1323 if (skb) {
1324 skb_set_owner_w(skb, sk);
1325 return skb;
1326 }
1327 }
1328 return NULL;
1329}
2a91525c 1330EXPORT_SYMBOL(sock_wmalloc);
1da177e4
LT		 1331
1332/*
1333 * Allocate a skb from the socket's receive buffer.
4ec93edb 1334 */
86a76caf 1335struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force,
dd0fc66f 1336 gfp_t priority)
1da177e4
LT		 1337{
1338 if (force || atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) {
1339 struct sk_buff *skb = alloc_skb(size, priority);
1340 if (skb) {
1341 skb_set_owner_r(skb, sk);
1342 return skb;
1343 }
1344 }
1345 return NULL;
1346}
1347
4ec93edb 1348/*
1da177e4 1349 * Allocate a memory block from the socket's option memory buffer.
4ec93edb 1350 */
dd0fc66f 1351void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
1da177e4
LT		 1352{
1353 if ((unsigned)size <= sysctl_optmem_max &&
1354 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) {
1355 void *mem;
1356 /* First do the add, to avoid the race if kmalloc
4ec93edb 1357 * might sleep.
1da177e4
LT		 1358 */
1359 atomic_add(size, &sk->sk_omem_alloc);
1360 mem = kmalloc(size, priority);
1361 if (mem)
1362 return mem;
1363 atomic_sub(size, &sk->sk_omem_alloc);
1364 }
1365 return NULL;
1366}
2a91525c 1367EXPORT_SYMBOL(sock_kmalloc);
1da177e4
LT		 1368
1369/*
1370 * Free an option memory block.
1371 */
1372void sock_kfree_s(struct sock *sk, void *mem, int size)
1373{
1374 kfree(mem);
1375 atomic_sub(size, &sk->sk_omem_alloc);
1376}
2a91525c 1377EXPORT_SYMBOL(sock_kfree_s);
1da177e4
LT		 1378
1379/* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
1380 I think, these locks should be removed for datagram sockets.
1381 */
2a91525c 1382static long sock_wait_for_wmem(struct sock *sk, long timeo)
1da177e4
LT		 1383{
1384 DEFINE_WAIT(wait);
1385
1386 clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1387 for (;;) {
1388 if (!timeo)
1389 break;
1390 if (signal_pending(current))
1391 break;
1392 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1393 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
1394 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf)
1395 break;
1396 if (sk->sk_shutdown & SEND_SHUTDOWN)
1397 break;
1398 if (sk->sk_err)
1399 break;
1400 timeo = schedule_timeout(timeo);
1401 }
1402 finish_wait(sk->sk_sleep, &wait);
1403 return timeo;
1404}
1405
1406
1407/*
1408 * Generic send/receive buffer handlers
1409 */
1410
4cc7f68d
HX		 1411struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len,
1412 unsigned long data_len, int noblock,
1413 int *errcode)
1da177e4
LT		 1414{
1415 struct sk_buff *skb;
7d877f3b 1416 gfp_t gfp_mask;
1da177e4
LT		 1417 long timeo;
1418 int err;
1419
1420 gfp_mask = sk->sk_allocation;
1421 if (gfp_mask & __GFP_WAIT)
1422 gfp_mask |= __GFP_REPEAT;
1423
1424 timeo = sock_sndtimeo(sk, noblock);
1425 while (1) {
1426 err = sock_error(sk);
1427 if (err != 0)
1428 goto failure;
1429
1430 err = -EPIPE;
1431 if (sk->sk_shutdown & SEND_SHUTDOWN)
1432 goto failure;
1433
1434 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
db38c179 1435 skb = alloc_skb(header_len, gfp_mask);
1da177e4
LT		 1436 if (skb) {
1437 int npages;
1438 int i;
1439
1440 /* No pages, we're done... */
1441 if (!data_len)
1442 break;
1443
1444 npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
1445 skb->truesize += data_len;
1446 skb_shinfo(skb)->nr_frags = npages;
1447 for (i = 0; i < npages; i++) {
1448 struct page *page;
1449 skb_frag_t *frag;
1450
1451 page = alloc_pages(sk->sk_allocation, 0);
1452 if (!page) {
1453 err = -ENOBUFS;
1454 skb_shinfo(skb)->nr_frags = i;
1455 kfree_skb(skb);
1456 goto failure;
1457 }
1458
1459 frag = &skb_shinfo(skb)->frags[i];
1460 frag->page = page;
1461 frag->page_offset = 0;
1462 frag->size = (data_len >= PAGE_SIZE ?
1463 PAGE_SIZE :
1464 data_len);
1465 data_len -= PAGE_SIZE;
1466 }
1467
1468 /* Full success... */
1469 break;
1470 }
1471 err = -ENOBUFS;
1472 goto failure;
1473 }
1474 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1475 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1476 err = -EAGAIN;
1477 if (!timeo)
1478 goto failure;
1479 if (signal_pending(current))
1480 goto interrupted;
1481 timeo = sock_wait_for_wmem(sk, timeo);
1482 }
1483
1484 skb_set_owner_w(skb, sk);
1485 return skb;
1486
1487interrupted:
1488 err = sock_intr_errno(timeo);
1489failure:
1490 *errcode = err;
1491 return NULL;
1492}
4cc7f68d 1493EXPORT_SYMBOL(sock_alloc_send_pskb);
1da177e4 1494
4ec93edb 1495struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
1da177e4
LT		 1496 int noblock, int *errcode)
1497{
1498 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode);
1499}
2a91525c 1500EXPORT_SYMBOL(sock_alloc_send_skb);
1da177e4
LT		 1501
1502static void __lock_sock(struct sock *sk)
1503{
1504 DEFINE_WAIT(wait);
1505
e71a4783 1506 for (;;) {
1da177e4
LT		 1507 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
1508 TASK_UNINTERRUPTIBLE);
1509 spin_unlock_bh(&sk->sk_lock.slock);
1510 schedule();
1511 spin_lock_bh(&sk->sk_lock.slock);
e71a4783 1512 if (!sock_owned_by_user(sk))
1da177e4
LT		 1513 break;
1514 }
1515 finish_wait(&sk->sk_lock.wq, &wait);
1516}
1517
1518static void __release_sock(struct sock *sk)
1519{
1520 struct sk_buff *skb = sk->sk_backlog.head;
1521
1522 do {
1523 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
1524 bh_unlock_sock(sk);
1525
1526 do {
1527 struct sk_buff *next = skb->next;
1528
1529 skb->next = NULL;
c57943a1 1530 sk_backlog_rcv(sk, skb);
1da177e4
LT		 1531
1532 /*
1533 * We are in process context here with softirqs
1534 * disabled, use cond_resched_softirq() to preempt.
1535 * This is safe to do because we've taken the backlog
1536 * queue private:
1537 */
1538 cond_resched_softirq();
1539
1540 skb = next;
1541 } while (skb != NULL);
1542
1543 bh_lock_sock(sk);
e71a4783 1544 } while ((skb = sk->sk_backlog.head) != NULL);
1da177e4
LT		 1545}
1546
1547/**
1548 * sk_wait_data - wait for data to arrive at sk_receive_queue
4dc3b16b
PP		 1549 * @sk: sock to wait on
1550 * @timeo: for how long
1da177e4
LT		 1551 *
1552 * Now socket state including sk->sk_err is changed only under lock,
1553 * hence we may omit checks after joining wait queue.
1554 * We check receive queue before schedule() only as optimization;
1555 * it is very likely that release_sock() added new data.
1556 */
1557int sk_wait_data(struct sock *sk, long *timeo)
1558{
1559 int rc;
1560 DEFINE_WAIT(wait);
1561
1562 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
1563 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1564 rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue));
1565 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1566 finish_wait(sk->sk_sleep, &wait);
1567 return rc;
1568}
1da177e4
LT		 1569EXPORT_SYMBOL(sk_wait_data);
1570
3ab224be
HA		 1571/**
1572 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated
1573 * @sk: socket
1574 * @size: memory size to allocate
1575 * @kind: allocation type
1576 *
1577 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means
1578 * rmem allocation. This function assumes that protocols which have
1579 * memory_pressure use sk_wmem_queued as write buffer accounting.
1580 */
1581int __sk_mem_schedule(struct sock *sk, int size, int kind)
1582{
1583 struct proto *prot = sk->sk_prot;
1584 int amt = sk_mem_pages(size);
1585 int allocated;
1586
1587 sk->sk_forward_alloc += amt * SK_MEM_QUANTUM;
1588 allocated = atomic_add_return(amt, prot->memory_allocated);
1589
1590 /* Under limit. */
1591 if (allocated <= prot->sysctl_mem[0]) {
1592 if (prot->memory_pressure && *prot->memory_pressure)
1593 *prot->memory_pressure = 0;
1594 return 1;
1595 }
1596
1597 /* Under pressure. */
1598 if (allocated > prot->sysctl_mem[1])
1599 if (prot->enter_memory_pressure)
5c52ba17 1600 prot->enter_memory_pressure(sk);
3ab224be
HA		 1601
1602 /* Over hard limit. */
1603 if (allocated > prot->sysctl_mem[2])
1604 goto suppress_allocation;
1605
1606 /* guarantee minimum buffer size under pressure */
1607 if (kind == SK_MEM_RECV) {
1608 if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0])
1609 return 1;
1610 } else { /* SK_MEM_SEND */
1611 if (sk->sk_type == SOCK_STREAM) {
1612 if (sk->sk_wmem_queued < prot->sysctl_wmem[0])
1613 return 1;
1614 } else if (atomic_read(&sk->sk_wmem_alloc) <
1615 prot->sysctl_wmem[0])
1616 return 1;
1617 }
1618
1619 if (prot->memory_pressure) {
1748376b
ED		 1620 int alloc;
1621
1622 if (!*prot->memory_pressure)
1623 return 1;
1624 alloc = percpu_counter_read_positive(prot->sockets_allocated);
1625 if (prot->sysctl_mem[2] > alloc *
3ab224be
HA		 1626 sk_mem_pages(sk->sk_wmem_queued +
1627 atomic_read(&sk->sk_rmem_alloc) +
1628 sk->sk_forward_alloc))
1629 return 1;
1630 }
1631
1632suppress_allocation:
1633
1634 if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) {
1635 sk_stream_moderate_sndbuf(sk);
1636
1637 /* Fail only if socket is _under_ its sndbuf.
1638 * In this case we cannot block, so that we have to fail.
1639 */
1640 if (sk->sk_wmem_queued + size >= sk->sk_sndbuf)
1641 return 1;
1642 }
1643
1644 /* Alas. Undo changes. */
1645 sk->sk_forward_alloc -= amt * SK_MEM_QUANTUM;
1646 atomic_sub(amt, prot->memory_allocated);
1647 return 0;
1648}
3ab224be
HA		 1649EXPORT_SYMBOL(__sk_mem_schedule);
1650
1651/**
1652 * __sk_reclaim - reclaim memory_allocated
1653 * @sk: socket
1654 */
1655void __sk_mem_reclaim(struct sock *sk)
1656{
1657 struct proto *prot = sk->sk_prot;
1658
680a5a50 1659 atomic_sub(sk->sk_forward_alloc >> SK_MEM_QUANTUM_SHIFT,
3ab224be
HA		 1660 prot->memory_allocated);
1661 sk->sk_forward_alloc &= SK_MEM_QUANTUM - 1;
1662
1663 if (prot->memory_pressure && *prot->memory_pressure &&
1664 (atomic_read(prot->memory_allocated) < prot->sysctl_mem[0]))
1665 *prot->memory_pressure = 0;
1666}
3ab224be
HA		 1667EXPORT_SYMBOL(__sk_mem_reclaim);
1668
1669
1da177e4
LT		 1670/*
1671 * Set of default routines for initialising struct proto_ops when
1672 * the protocol does not support a particular function. In certain
1673 * cases where it makes no sense for a protocol to have a "do nothing"
1674 * function, some default processing is provided.
1675 */
1676
1677int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
1678{
1679 return -EOPNOTSUPP;
1680}
2a91525c 1681EXPORT_SYMBOL(sock_no_bind);
1da177e4 1682
4ec93edb 1683int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 1684 int len, int flags)
1685{
1686 return -EOPNOTSUPP;
1687}
2a91525c 1688EXPORT_SYMBOL(sock_no_connect);
1da177e4
LT		 1689
1690int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
1691{
1692 return -EOPNOTSUPP;
1693}
2a91525c 1694EXPORT_SYMBOL(sock_no_socketpair);
1da177e4
LT		 1695
1696int sock_no_accept(struct socket *sock, struct socket *newsock, int flags)
1697{
1698 return -EOPNOTSUPP;
1699}
2a91525c 1700EXPORT_SYMBOL(sock_no_accept);
1da177e4 1701
4ec93edb 1702int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 1703 int *len, int peer)
1704{
1705 return -EOPNOTSUPP;
1706}
2a91525c 1707EXPORT_SYMBOL(sock_no_getname);
1da177e4 1708
2a91525c 1709unsigned int sock_no_poll(struct file *file, struct socket *sock, poll_table *pt)
1da177e4
LT		 1710{
1711 return 0;
1712}
2a91525c 1713EXPORT_SYMBOL(sock_no_poll);
1da177e4
LT		 1714
1715int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1716{
1717 return -EOPNOTSUPP;
1718}
2a91525c 1719EXPORT_SYMBOL(sock_no_ioctl);
1da177e4
LT		 1720
1721int sock_no_listen(struct socket *sock, int backlog)
1722{
1723 return -EOPNOTSUPP;
1724}
2a91525c 1725EXPORT_SYMBOL(sock_no_listen);
1da177e4
LT		 1726
1727int sock_no_shutdown(struct socket *sock, int how)
1728{
1729 return -EOPNOTSUPP;
1730}
2a91525c 1731EXPORT_SYMBOL(sock_no_shutdown);
1da177e4
LT		 1732
1733int sock_no_setsockopt(struct socket *sock, int level, int optname,
b7058842 1734 char __user *optval, unsigned int optlen)
1da177e4
LT		 1735{
1736 return -EOPNOTSUPP;
1737}
2a91525c 1738EXPORT_SYMBOL(sock_no_setsockopt);
1da177e4
LT		 1739
1740int sock_no_getsockopt(struct socket *sock, int level, int optname,
1741 char __user *optval, int __user *optlen)
1742{
1743 return -EOPNOTSUPP;
1744}
2a91525c 1745EXPORT_SYMBOL(sock_no_getsockopt);
1da177e4
LT		 1746
1747int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
1748 size_t len)
1749{
1750 return -EOPNOTSUPP;
1751}
2a91525c 1752EXPORT_SYMBOL(sock_no_sendmsg);
1da177e4
LT		 1753
1754int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
1755 size_t len, int flags)
1756{
1757 return -EOPNOTSUPP;
1758}
2a91525c 1759EXPORT_SYMBOL(sock_no_recvmsg);
1da177e4
LT		 1760
1761int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
1762{
1763 /* Mirror missing mmap method error code */
1764 return -ENODEV;
1765}
2a91525c 1766EXPORT_SYMBOL(sock_no_mmap);
1da177e4
LT		 1767
1768ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
1769{
1770 ssize_t res;
1771 struct msghdr msg = {.msg_flags = flags};
1772 struct kvec iov;
1773 char *kaddr = kmap(page);
1774 iov.iov_base = kaddr + offset;
1775 iov.iov_len = size;
1776 res = kernel_sendmsg(sock, &msg, &iov, 1, size);
1777 kunmap(page);
1778 return res;
1779}
2a91525c 1780EXPORT_SYMBOL(sock_no_sendpage);
1da177e4
LT		 1781
1782/*
1783 * Default Socket Callbacks
1784 */
1785
1786static void sock_def_wakeup(struct sock *sk)
1787{
1788 read_lock(&sk->sk_callback_lock);
a57de0b4 1789 if (sk_has_sleeper(sk))
1da177e4
LT		 1790 wake_up_interruptible_all(sk->sk_sleep);
1791 read_unlock(&sk->sk_callback_lock);
1792}
1793
1794static void sock_def_error_report(struct sock *sk)
1795{
1796 read_lock(&sk->sk_callback_lock);
a57de0b4 1797 if (sk_has_sleeper(sk))
37e5540b 1798 wake_up_interruptible_poll(sk->sk_sleep, POLLERR);
8d8ad9d7 1799 sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR);
1da177e4
LT		 1800 read_unlock(&sk->sk_callback_lock);
1801}
1802
1803static void sock_def_readable(struct sock *sk, int len)
1804{
1805 read_lock(&sk->sk_callback_lock);
a57de0b4 1806 if (sk_has_sleeper(sk))
37e5540b
DL		 1807 wake_up_interruptible_sync_poll(sk->sk_sleep, POLLIN |
1808 POLLRDNORM | POLLRDBAND);
8d8ad9d7 1809 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
1da177e4
LT		 1810 read_unlock(&sk->sk_callback_lock);
1811}
1812
1813static void sock_def_write_space(struct sock *sk)
1814{
1815 read_lock(&sk->sk_callback_lock);
1816
1817 /* Do not wake up a writer until he can make "significant"
1818 * progress. --DaveM
1819 */
e71a4783 1820 if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) {
a57de0b4 1821 if (sk_has_sleeper(sk))
37e5540b
DL		 1822 wake_up_interruptible_sync_poll(sk->sk_sleep, POLLOUT |
1823 POLLWRNORM | POLLWRBAND);
1da177e4
LT		 1824
1825 /* Should agree with poll, otherwise some programs break */
1826 if (sock_writeable(sk))
8d8ad9d7 1827 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
1da177e4
LT		 1828 }
1829
1830 read_unlock(&sk->sk_callback_lock);
1831}
1832
1833static void sock_def_destruct(struct sock *sk)
1834{
a51482bd 1835 kfree(sk->sk_protinfo);
1da177e4
LT		 1836}
1837
1838void sk_send_sigurg(struct sock *sk)
1839{
1840 if (sk->sk_socket && sk->sk_socket->file)
1841 if (send_sigurg(&sk->sk_socket->file->f_owner))
8d8ad9d7 1842 sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI);
1da177e4 1843}
2a91525c 1844EXPORT_SYMBOL(sk_send_sigurg);
1da177e4
LT		 1845
1846void sk_reset_timer(struct sock *sk, struct timer_list* timer,
1847 unsigned long expires)
1848{
1849 if (!mod_timer(timer, expires))
1850 sock_hold(sk);
1851}
1da177e4
LT		 1852EXPORT_SYMBOL(sk_reset_timer);
1853
1854void sk_stop_timer(struct sock *sk, struct timer_list* timer)
1855{
1856 if (timer_pending(timer) && del_timer(timer))
1857 __sock_put(sk);
1858}
1da177e4
LT		 1859EXPORT_SYMBOL(sk_stop_timer);
1860
1861void sock_init_data(struct socket *sock, struct sock *sk)
1862{
1863 skb_queue_head_init(&sk->sk_receive_queue);
1864 skb_queue_head_init(&sk->sk_write_queue);
1865 skb_queue_head_init(&sk->sk_error_queue);
97fc2f08
CL		 1866#ifdef CONFIG_NET_DMA
1867 skb_queue_head_init(&sk->sk_async_wait_queue);
1868#endif
1da177e4
LT		 1869
1870 sk->sk_send_head = NULL;
1871
1872 init_timer(&sk->sk_timer);
4ec93edb 1873
1da177e4
LT		 1874 sk->sk_allocation = GFP_KERNEL;
1875 sk->sk_rcvbuf = sysctl_rmem_default;
1876 sk->sk_sndbuf = sysctl_wmem_default;
1877 sk->sk_state = TCP_CLOSE;
972692e0 1878 sk_set_socket(sk, sock);
1da177e4
LT		 1879
1880 sock_set_flag(sk, SOCK_ZAPPED);
1881
e71a4783 1882 if (sock) {
1da177e4
LT		 1883 sk->sk_type = sock->type;
1884 sk->sk_sleep = &sock->wait;
1885 sock->sk = sk;
1886 } else
1887 sk->sk_sleep = NULL;
1888
1889 rwlock_init(&sk->sk_dst_lock);
1890 rwlock_init(&sk->sk_callback_lock);
443aef0e
PZ		 1891 lockdep_set_class_and_name(&sk->sk_callback_lock,
1892 af_callback_keys + sk->sk_family,
1893 af_family_clock_key_strings[sk->sk_family]);
1da177e4
LT		 1894
1895 sk->sk_state_change = sock_def_wakeup;
1896 sk->sk_data_ready = sock_def_readable;
1897 sk->sk_write_space = sock_def_write_space;
1898 sk->sk_error_report = sock_def_error_report;
1899 sk->sk_destruct = sock_def_destruct;
1900
1901 sk->sk_sndmsg_page = NULL;
1902 sk->sk_sndmsg_off = 0;
1903
1904 sk->sk_peercred.pid = 0;
1905 sk->sk_peercred.uid = -1;
1906 sk->sk_peercred.gid = -1;
1907 sk->sk_write_pending = 0;
1908 sk->sk_rcvlowat = 1;
1909 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
1910 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
1911
f37f0afb 1912 sk->sk_stamp = ktime_set(-1L, 0);
1da177e4 1913
4dc6dc71
ED		 1914 /*
1915 * Before updating sk_refcnt, we must commit prior changes to memory
1916 * (Documentation/RCU/rculist_nulls.txt for details)
1917 */
1918 smp_wmb();
1da177e4 1919 atomic_set(&sk->sk_refcnt, 1);
33c732c3 1920 atomic_set(&sk->sk_drops, 0);
1da177e4 1921}
2a91525c 1922EXPORT_SYMBOL(sock_init_data);
1da177e4 1923
b5606c2d 1924void lock_sock_nested(struct sock *sk, int subclass)
1da177e4
LT		 1925{
1926 might_sleep();
a5b5bb9a 1927 spin_lock_bh(&sk->sk_lock.slock);
d2e9117c 1928 if (sk->sk_lock.owned)
1da177e4 1929 __lock_sock(sk);
d2e9117c 1930 sk->sk_lock.owned = 1;
a5b5bb9a
IM		 1931 spin_unlock(&sk->sk_lock.slock);
1932 /*
1933 * The sk_lock has mutex_lock() semantics here:
1934 */
fcc70d5f 1935 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
a5b5bb9a 1936 local_bh_enable();
1da177e4 1937}
fcc70d5f 1938EXPORT_SYMBOL(lock_sock_nested);
1da177e4 1939
b5606c2d 1940void release_sock(struct sock *sk)
1da177e4 1941{
a5b5bb9a
IM		 1942 /*
1943 * The sk_lock has mutex_unlock() semantics:
1944 */
1945 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
1946
1947 spin_lock_bh(&sk->sk_lock.slock);
1da177e4
LT		 1948 if (sk->sk_backlog.tail)
1949 __release_sock(sk);
d2e9117c 1950 sk->sk_lock.owned = 0;
a5b5bb9a
IM		 1951 if (waitqueue_active(&sk->sk_lock.wq))
1952 wake_up(&sk->sk_lock.wq);
1953 spin_unlock_bh(&sk->sk_lock.slock);
1da177e4
LT		 1954}
1955EXPORT_SYMBOL(release_sock);
1956
1957int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
4ec93edb 1958{
b7aa0bf7 1959 struct timeval tv;
1da177e4 1960 if (!sock_flag(sk, SOCK_TIMESTAMP))
20d49473 1961 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
b7aa0bf7
ED		 1962 tv = ktime_to_timeval(sk->sk_stamp);
1963 if (tv.tv_sec == -1)
1da177e4 1964 return -ENOENT;
b7aa0bf7
ED		 1965 if (tv.tv_sec == 0) {
1966 sk->sk_stamp = ktime_get_real();
1967 tv = ktime_to_timeval(sk->sk_stamp);
1968 }
1969 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0;
4ec93edb 1970}
1da177e4
LT		 1971EXPORT_SYMBOL(sock_get_timestamp);
1972
ae40eb1e
ED		 1973int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
1974{
1975 struct timespec ts;
1976 if (!sock_flag(sk, SOCK_TIMESTAMP))
20d49473 1977 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
ae40eb1e
ED		 1978 ts = ktime_to_timespec(sk->sk_stamp);
1979 if (ts.tv_sec == -1)
1980 return -ENOENT;
1981 if (ts.tv_sec == 0) {
1982 sk->sk_stamp = ktime_get_real();
1983 ts = ktime_to_timespec(sk->sk_stamp);
1984 }
1985 return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0;
1986}
1987EXPORT_SYMBOL(sock_get_timestampns);
1988
20d49473 1989void sock_enable_timestamp(struct sock *sk, int flag)
4ec93edb 1990{
20d49473
PO		 1991 if (!sock_flag(sk, flag)) {
1992 sock_set_flag(sk, flag);
1993 /*
1994 * we just set one of the two flags which require net
1995 * time stamping, but time stamping might have been on
1996 * already because of the other one
1997 */
1998 if (!sock_flag(sk,
1999 flag == SOCK_TIMESTAMP ?
2000 SOCK_TIMESTAMPING_RX_SOFTWARE :
2001 SOCK_TIMESTAMP))
2002 net_enable_timestamp();
1da177e4
LT		 2003 }
2004}
1da177e4
LT		 2005
2006/*
2007 * Get a socket option on an socket.
2008 *
2009 * FIX: POSIX 1003.1g is very ambiguous here. It states that
2010 * asynchronous errors should be reported by getsockopt. We assume
2011 * this means if you specify SO_ERROR (otherwise whats the point of it).
2012 */
2013int sock_common_getsockopt(struct socket *sock, int level, int optname,
2014 char __user *optval, int __user *optlen)
2015{
2016 struct sock *sk = sock->sk;
2017
2018 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2019}
1da177e4
LT		 2020EXPORT_SYMBOL(sock_common_getsockopt);
2021
3fdadf7d 2022#ifdef CONFIG_COMPAT
543d9cfe
ACM		 2023int compat_sock_common_getsockopt(struct socket *sock, int level, int optname,
2024 char __user *optval, int __user *optlen)
3fdadf7d
DM		 2025{
2026 struct sock *sk = sock->sk;
2027
1e51f951 2028 if (sk->sk_prot->compat_getsockopt != NULL)
543d9cfe
ACM		 2029 return sk->sk_prot->compat_getsockopt(sk, level, optname,
2030 optval, optlen);
3fdadf7d
DM		 2031 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
2032}
2033EXPORT_SYMBOL(compat_sock_common_getsockopt);
2034#endif
2035
1da177e4
LT		 2036int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock,
2037 struct msghdr *msg, size_t size, int flags)
2038{
2039 struct sock *sk = sock->sk;
2040 int addr_len = 0;
2041 int err;
2042
2043 err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT,
2044 flags & ~MSG_DONTWAIT, &addr_len);
2045 if (err >= 0)
2046 msg->msg_namelen = addr_len;
2047 return err;
2048}
1da177e4
LT		 2049EXPORT_SYMBOL(sock_common_recvmsg);
2050
2051/*
2052 * Set socket options on an inet socket.
2053 */
2054int sock_common_setsockopt(struct socket *sock, int level, int optname,
b7058842 2055 char __user *optval, unsigned int optlen)
1da177e4
LT		 2056{
2057 struct sock *sk = sock->sk;
2058
2059 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2060}
1da177e4
LT		 2061EXPORT_SYMBOL(sock_common_setsockopt);
2062
3fdadf7d 2063#ifdef CONFIG_COMPAT
543d9cfe 2064int compat_sock_common_setsockopt(struct socket *sock, int level, int optname,
b7058842 2065 char __user *optval, unsigned int optlen)
3fdadf7d
DM		 2066{
2067 struct sock *sk = sock->sk;
2068
543d9cfe
ACM		 2069 if (sk->sk_prot->compat_setsockopt != NULL)
2070 return sk->sk_prot->compat_setsockopt(sk, level, optname,
2071 optval, optlen);
3fdadf7d
DM		 2072 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2073}
2074EXPORT_SYMBOL(compat_sock_common_setsockopt);
2075#endif
2076
1da177e4
LT		 2077void sk_common_release(struct sock *sk)
2078{
2079 if (sk->sk_prot->destroy)
2080 sk->sk_prot->destroy(sk);
2081
2082 /*
2083 * Observation: when sock_common_release is called, processes have
2084 * no access to socket. But net still has.
2085 * Step one, detach it from networking:
2086 *
2087 * A. Remove from hash tables.
2088 */
2089
2090 sk->sk_prot->unhash(sk);
2091
2092 /*
2093 * In this point socket cannot receive new packets, but it is possible
2094 * that some packets are in flight because some CPU runs receiver and
2095 * did hash table lookup before we unhashed socket. They will achieve
2096 * receive queue and will be purged by socket destructor.
2097 *
2098 * Also we still have packets pending on receive queue and probably,
2099 * our own packets waiting in device queues. sock_destroy will drain
2100 * receive queue, but transmitted packets will delay socket destruction
2101 * until the last reference will be released.
2102 */
2103
2104 sock_orphan(sk);
2105
2106 xfrm_sk_free_policy(sk);
2107
e6848976 2108 sk_refcnt_debug_release(sk);
1da177e4
LT		 2109 sock_put(sk);
2110}
1da177e4
LT		 2111EXPORT_SYMBOL(sk_common_release);
2112
2113static DEFINE_RWLOCK(proto_list_lock);
2114static LIST_HEAD(proto_list);
2115
13ff3d6f
PE		 2116#ifdef CONFIG_PROC_FS
2117#define PROTO_INUSE_NR 64 /* should be enough for the first time */
1338d466
PE		 2118struct prot_inuse {
2119 int val[PROTO_INUSE_NR];
2120};
13ff3d6f
PE		 2121
2122static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR);
70ee1159
PE		 2123
2124#ifdef CONFIG_NET_NS
2125void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
2126{
2127 int cpu = smp_processor_id();
2128 per_cpu_ptr(net->core.inuse, cpu)->val[prot->inuse_idx] += val;
2129}
2130EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2131
2132int sock_prot_inuse_get(struct net *net, struct proto *prot)
2133{
2134 int cpu, idx = prot->inuse_idx;
2135 int res = 0;
2136
2137 for_each_possible_cpu(cpu)
2138 res += per_cpu_ptr(net->core.inuse, cpu)->val[idx];
2139
2140 return res >= 0 ? res : 0;
2141}
2142EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
2143
2c8c1e72 2144static int __net_init sock_inuse_init_net(struct net *net)
70ee1159
PE		 2145{
2146 net->core.inuse = alloc_percpu(struct prot_inuse);
2147 return net->core.inuse ? 0 : -ENOMEM;
2148}
2149
2c8c1e72 2150static void __net_exit sock_inuse_exit_net(struct net *net)
70ee1159
PE		 2151{
2152 free_percpu(net->core.inuse);
2153}
2154
2155static struct pernet_operations net_inuse_ops = {
2156 .init = sock_inuse_init_net,
2157 .exit = sock_inuse_exit_net,
2158};
2159
2160static __init int net_inuse_init(void)
2161{
2162 if (register_pernet_subsys(&net_inuse_ops))
2163 panic("Cannot initialize net inuse counters");
2164
2165 return 0;
2166}
2167
2168core_initcall(net_inuse_init);
2169#else
1338d466
PE		 2170static DEFINE_PER_CPU(struct prot_inuse, prot_inuse);
2171
c29a0bc4 2172void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
1338d466
PE		 2173{
2174 __get_cpu_var(prot_inuse).val[prot->inuse_idx] += val;
2175}
2176EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2177
c29a0bc4 2178int sock_prot_inuse_get(struct net *net, struct proto *prot)
1338d466
PE		 2179{
2180 int cpu, idx = prot->inuse_idx;
2181 int res = 0;
2182
2183 for_each_possible_cpu(cpu)
2184 res += per_cpu(prot_inuse, cpu).val[idx];
2185
2186 return res >= 0 ? res : 0;
2187}
2188EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
70ee1159 2189#endif
13ff3d6f
PE		 2190
2191static void assign_proto_idx(struct proto *prot)
2192{
2193 prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR);
2194
2195 if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) {
2196 printk(KERN_ERR "PROTO_INUSE_NR exhausted\n");
2197 return;
2198 }
2199
2200 set_bit(prot->inuse_idx, proto_inuse_idx);
2201}
2202
2203static void release_proto_idx(struct proto *prot)
2204{
2205 if (prot->inuse_idx != PROTO_INUSE_NR - 1)
2206 clear_bit(prot->inuse_idx, proto_inuse_idx);
2207}
2208#else
2209static inline void assign_proto_idx(struct proto *prot)
2210{
2211}
2212
2213static inline void release_proto_idx(struct proto *prot)
2214{
2215}
2216#endif
2217
b733c007
PE		 2218int proto_register(struct proto *prot, int alloc_slab)
2219{
1da177e4
LT		 2220 if (alloc_slab) {
2221 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0,
271b72c7
ED		 2222 SLAB_HWCACHE_ALIGN | prot->slab_flags,
2223 NULL);
1da177e4
LT		 2224
2225 if (prot->slab == NULL) {
2226 printk(KERN_CRIT "%s: Can't create sock SLAB cache!\n",
2227 prot->name);
60e7663d 2228 goto out;
1da177e4 2229 }
2e6599cb
ACM		 2230
2231 if (prot->rsk_prot != NULL) {
faf23422 2232 prot->rsk_prot->slab_name = kasprintf(GFP_KERNEL, "request_sock_%s", prot->name);
7e56b5d6 2233 if (prot->rsk_prot->slab_name == NULL)
2e6599cb
ACM		 2234 goto out_free_sock_slab;
2235
7e56b5d6 2236 prot->rsk_prot->slab = kmem_cache_create(prot->rsk_prot->slab_name,
2e6599cb 2237 prot->rsk_prot->obj_size, 0,
20c2df83 2238 SLAB_HWCACHE_ALIGN, NULL);
2e6599cb
ACM		 2239
2240 if (prot->rsk_prot->slab == NULL) {
2241 printk(KERN_CRIT "%s: Can't create request sock SLAB cache!\n",
2242 prot->name);
2243 goto out_free_request_sock_slab_name;
2244 }
2245 }
8feaf0c0 2246
6d6ee43e 2247 if (prot->twsk_prot != NULL) {
faf23422 2248 prot->twsk_prot->twsk_slab_name = kasprintf(GFP_KERNEL, "tw_sock_%s", prot->name);
8feaf0c0 2249
7e56b5d6 2250 if (prot->twsk_prot->twsk_slab_name == NULL)
8feaf0c0
ACM		 2251 goto out_free_request_sock_slab;
2252
6d6ee43e 2253 prot->twsk_prot->twsk_slab =
7e56b5d6 2254 kmem_cache_create(prot->twsk_prot->twsk_slab_name,
6d6ee43e 2255 prot->twsk_prot->twsk_obj_size,
3ab5aee7
ED		 2256 0,
2257 SLAB_HWCACHE_ALIGN |
2258 prot->slab_flags,
20c2df83 2259 NULL);
6d6ee43e 2260 if (prot->twsk_prot->twsk_slab == NULL)
8feaf0c0
ACM		 2261 goto out_free_timewait_sock_slab_name;
2262 }
1da177e4
LT		 2263 }
2264
2a278051 2265 write_lock(&proto_list_lock);
1da177e4 2266 list_add(&prot->node, &proto_list);
13ff3d6f 2267 assign_proto_idx(prot);
1da177e4 2268 write_unlock(&proto_list_lock);
b733c007
PE		 2269 return 0;
2270
8feaf0c0 2271out_free_timewait_sock_slab_name:
7e56b5d6 2272 kfree(prot->twsk_prot->twsk_slab_name);
8feaf0c0
ACM		 2273out_free_request_sock_slab:
2274 if (prot->rsk_prot && prot->rsk_prot->slab) {
2275 kmem_cache_destroy(prot->rsk_prot->slab);
2276 prot->rsk_prot->slab = NULL;
2277 }
2e6599cb 2278out_free_request_sock_slab_name:
7e56b5d6 2279 kfree(prot->rsk_prot->slab_name);
2e6599cb
ACM		 2280out_free_sock_slab:
2281 kmem_cache_destroy(prot->slab);
2282 prot->slab = NULL;
b733c007
PE		 2283out:
2284 return -ENOBUFS;
1da177e4 2285}
1da177e4
LT		 2286EXPORT_SYMBOL(proto_register);
2287
2288void proto_unregister(struct proto *prot)
2289{
2290 write_lock(&proto_list_lock);
13ff3d6f 2291 release_proto_idx(prot);
0a3f4358
PM		 2292 list_del(&prot->node);
2293 write_unlock(&proto_list_lock);
1da177e4
LT		 2294
2295 if (prot->slab != NULL) {
2296 kmem_cache_destroy(prot->slab);
2297 prot->slab = NULL;
2298 }
2299
2e6599cb 2300 if (prot->rsk_prot != NULL && prot->rsk_prot->slab != NULL) {
2e6599cb 2301 kmem_cache_destroy(prot->rsk_prot->slab);
7e56b5d6 2302 kfree(prot->rsk_prot->slab_name);
2e6599cb
ACM		 2303 prot->rsk_prot->slab = NULL;
2304 }
2305
6d6ee43e 2306 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) {
6d6ee43e 2307 kmem_cache_destroy(prot->twsk_prot->twsk_slab);
7e56b5d6 2308 kfree(prot->twsk_prot->twsk_slab_name);
6d6ee43e 2309 prot->twsk_prot->twsk_slab = NULL;
8feaf0c0 2310 }
1da177e4 2311}
1da177e4
LT		 2312EXPORT_SYMBOL(proto_unregister);
2313
2314#ifdef CONFIG_PROC_FS
1da177e4 2315static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
9a429c49 2316 __acquires(proto_list_lock)
1da177e4
LT		 2317{
2318 read_lock(&proto_list_lock);
60f0438a 2319 return seq_list_start_head(&proto_list, *pos);
1da177e4
LT		 2320}
2321
2322static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2323{
60f0438a 2324 return seq_list_next(v, &proto_list, pos);
1da177e4
LT		 2325}
2326
2327static void proto_seq_stop(struct seq_file *seq, void *v)
9a429c49 2328 __releases(proto_list_lock)
1da177e4
LT		 2329{
2330 read_unlock(&proto_list_lock);
2331}
2332
2333static char proto_method_implemented(const void *method)
2334{
2335 return method == NULL ? 'n' : 'y';
2336}
2337
2338static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
2339{
2340 seq_printf(seq, "%-9s %4u %6d %6d %-3s %6u %-3s %-10s "
2341 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
2342 proto->name,
2343 proto->obj_size,
14e943db 2344 sock_prot_inuse_get(seq_file_net(seq), proto),
1da177e4
LT		 2345 proto->memory_allocated != NULL ? atomic_read(proto->memory_allocated) : -1,
2346 proto->memory_pressure != NULL ? *proto->memory_pressure ? "yes" : "no" : "NI",
2347 proto->max_header,
2348 proto->slab == NULL ? "no" : "yes",
2349 module_name(proto->owner),
2350 proto_method_implemented(proto->close),
2351 proto_method_implemented(proto->connect),
2352 proto_method_implemented(proto->disconnect),
2353 proto_method_implemented(proto->accept),
2354 proto_method_implemented(proto->ioctl),
2355 proto_method_implemented(proto->init),
2356 proto_method_implemented(proto->destroy),
2357 proto_method_implemented(proto->shutdown),
2358 proto_method_implemented(proto->setsockopt),
2359 proto_method_implemented(proto->getsockopt),
2360 proto_method_implemented(proto->sendmsg),
2361 proto_method_implemented(proto->recvmsg),
2362 proto_method_implemented(proto->sendpage),
2363 proto_method_implemented(proto->bind),
2364 proto_method_implemented(proto->backlog_rcv),
2365 proto_method_implemented(proto->hash),
2366 proto_method_implemented(proto->unhash),
2367 proto_method_implemented(proto->get_port),
2368 proto_method_implemented(proto->enter_memory_pressure));
2369}
2370
2371static int proto_seq_show(struct seq_file *seq, void *v)
2372{
60f0438a 2373 if (v == &proto_list)
1da177e4
LT		 2374 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
2375 "protocol",
2376 "size",
2377 "sockets",
2378 "memory",
2379 "press",
2380 "maxhdr",
2381 "slab",
2382 "module",
2383 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
2384 else
60f0438a 2385 proto_seq_printf(seq, list_entry(v, struct proto, node));
1da177e4
LT		 2386 return 0;
2387}
2388
f690808e 2389static const struct seq_operations proto_seq_ops = {
1da177e4
LT		 2390 .start = proto_seq_start,
2391 .next = proto_seq_next,
2392 .stop = proto_seq_stop,
2393 .show = proto_seq_show,
2394};
2395
2396static int proto_seq_open(struct inode *inode, struct file *file)
2397{
14e943db
ED		 2398 return seq_open_net(inode, file, &proto_seq_ops,
2399 sizeof(struct seq_net_private));
1da177e4
LT		 2400}
2401
9a32144e 2402static const struct file_operations proto_seq_fops = {
1da177e4
LT		 2403 .owner = THIS_MODULE,
2404 .open = proto_seq_open,
2405 .read = seq_read,
2406 .llseek = seq_lseek,
14e943db
ED		 2407 .release = seq_release_net,
2408};
2409
2410static __net_init int proto_init_net(struct net *net)
2411{
2412 if (!proc_net_fops_create(net, "protocols", S_IRUGO, &proto_seq_fops))
2413 return -ENOMEM;
2414
2415 return 0;
2416}
2417
2418static __net_exit void proto_exit_net(struct net *net)
2419{
2420 proc_net_remove(net, "protocols");
2421}
2422
2423
2424static __net_initdata struct pernet_operations proto_net_ops = {
2425 .init = proto_init_net,
2426 .exit = proto_exit_net,
1da177e4
LT		 2427};
2428
2429static int __init proto_init(void)
2430{
14e943db 2431 return register_pernet_subsys(&proto_net_ops);
1da177e4
LT		 2432}
2433
2434subsys_initcall(proto_init);
2435
2436#endif /* PROC_FS */
Linux 6.x block layer and io_uring tree(s)