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[net-next-2.6.git] / net / core / sock.c
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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{
277 int err = 0;
278 int skb_len;
279
9ee6b7f1 280 /* Cast sk->rcvbuf to unsigned... It's pointless, but reduces
f0088a50
DV		 281 number of warnings when compiling with -W --ANK
282 */
283 if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >=
284 (unsigned)sk->sk_rcvbuf) {
285 err = -ENOMEM;
286 goto out;
287 }
288
fda9ef5d 289 err = sk_filter(sk, skb);
f0088a50
DV		 290 if (err)
291 goto out;
292
3ab224be
HA		 293 if (!sk_rmem_schedule(sk, skb->truesize)) {
294 err = -ENOBUFS;
295 goto out;
296 }
297
f0088a50
DV		 298 skb->dev = NULL;
299 skb_set_owner_r(skb, sk);
49ad9599 300
f0088a50
DV		 301 /* Cache the SKB length before we tack it onto the receive
302 * queue. Once it is added it no longer belongs to us and
303 * may be freed by other threads of control pulling packets
304 * from the queue.
305 */
306 skb_len = skb->len;
307
308 skb_queue_tail(&sk->sk_receive_queue, skb);
309
310 if (!sock_flag(sk, SOCK_DEAD))
311 sk->sk_data_ready(sk, skb_len);
312out:
313 return err;
314}
315EXPORT_SYMBOL(sock_queue_rcv_skb);
316
58a5a7b9 317int sk_receive_skb(struct sock *sk, struct sk_buff *skb, const int nested)
f0088a50
DV		 318{
319 int rc = NET_RX_SUCCESS;
320
fda9ef5d 321 if (sk_filter(sk, skb))
f0088a50
DV		 322 goto discard_and_relse;
323
324 skb->dev = NULL;
325
58a5a7b9
ACM		 326 if (nested)
327 bh_lock_sock_nested(sk);
328 else
329 bh_lock_sock(sk);
a5b5bb9a
IM		 330 if (!sock_owned_by_user(sk)) {
331 /*
332 * trylock + unlock semantics:
333 */
334 mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_);
335
c57943a1 336 rc = sk_backlog_rcv(sk, skb);
a5b5bb9a
IM		 337
338 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
339 } else
f0088a50
DV		 340 sk_add_backlog(sk, skb);
341 bh_unlock_sock(sk);
342out:
343 sock_put(sk);
344 return rc;
345discard_and_relse:
346 kfree_skb(skb);
347 goto out;
348}
349EXPORT_SYMBOL(sk_receive_skb);
350
351struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie)
352{
353 struct dst_entry *dst = sk->sk_dst_cache;
354
355 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
356 sk->sk_dst_cache = NULL;
357 dst_release(dst);
358 return NULL;
359 }
360
361 return dst;
362}
363EXPORT_SYMBOL(__sk_dst_check);
364
365struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie)
366{
367 struct dst_entry *dst = sk_dst_get(sk);
368
369 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
370 sk_dst_reset(sk);
371 dst_release(dst);
372 return NULL;
373 }
374
375 return dst;
376}
377EXPORT_SYMBOL(sk_dst_check);
378
4878809f
DM		 379static int sock_bindtodevice(struct sock *sk, char __user *optval, int optlen)
380{
381 int ret = -ENOPROTOOPT;
382#ifdef CONFIG_NETDEVICES
3b1e0a65 383 struct net *net = sock_net(sk);
4878809f
DM		 384 char devname[IFNAMSIZ];
385 int index;
386
387 /* Sorry... */
388 ret = -EPERM;
389 if (!capable(CAP_NET_RAW))
390 goto out;
391
392 ret = -EINVAL;
393 if (optlen < 0)
394 goto out;
395
396 /* Bind this socket to a particular device like "eth0",
397 * as specified in the passed interface name. If the
398 * name is "" or the option length is zero the socket
399 * is not bound.
400 */
401 if (optlen > IFNAMSIZ - 1)
402 optlen = IFNAMSIZ - 1;
403 memset(devname, 0, sizeof(devname));
404
405 ret = -EFAULT;
406 if (copy_from_user(devname, optval, optlen))
407 goto out;
408
409 if (devname[0] == '\0') {
410 index = 0;
411 } else {
881d966b 412 struct net_device *dev = dev_get_by_name(net, devname);
4878809f
DM		 413
414 ret = -ENODEV;
415 if (!dev)
416 goto out;
417
418 index = dev->ifindex;
419 dev_put(dev);
420 }
421
422 lock_sock(sk);
423 sk->sk_bound_dev_if = index;
424 sk_dst_reset(sk);
425 release_sock(sk);
426
427 ret = 0;
428
429out:
430#endif
431
432 return ret;
433}
434
c0ef877b
PE		 435static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool)
436{
437 if (valbool)
438 sock_set_flag(sk, bit);
439 else
440 sock_reset_flag(sk, bit);
441}
442
1da177e4
LT		 443/*
444 * This is meant for all protocols to use and covers goings on
445 * at the socket level. Everything here is generic.
446 */
447
448int sock_setsockopt(struct socket *sock, int level, int optname,
449 char __user *optval, int optlen)
450{
2a91525c 451 struct sock *sk = sock->sk;
1da177e4
LT		 452 int val;
453 int valbool;
454 struct linger ling;
455 int ret = 0;
4ec93edb 456
1da177e4
LT		 457 /*
458 * Options without arguments
459 */
460
4878809f
DM		 461 if (optname == SO_BINDTODEVICE)
462 return sock_bindtodevice(sk, optval, optlen);
463
e71a4783
SH		 464 if (optlen < sizeof(int))
465 return -EINVAL;
4ec93edb 466
1da177e4
LT		 467 if (get_user(val, (int __user *)optval))
468 return -EFAULT;
4ec93edb 469
2a91525c 470 valbool = val ? 1 : 0;
1da177e4
LT		 471
472 lock_sock(sk);
473
2a91525c 474 switch (optname) {
e71a4783 475 case SO_DEBUG:
2a91525c 476 if (val && !capable(CAP_NET_ADMIN))
e71a4783 477 ret = -EACCES;
2a91525c 478 else
c0ef877b 479 sock_valbool_flag(sk, SOCK_DBG, valbool);
e71a4783
SH		 480 break;
481 case SO_REUSEADDR:
482 sk->sk_reuse = valbool;
483 break;
484 case SO_TYPE:
485 case SO_ERROR:
486 ret = -ENOPROTOOPT;
487 break;
488 case SO_DONTROUTE:
c0ef877b 489 sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool);
e71a4783
SH		 490 break;
491 case SO_BROADCAST:
492 sock_valbool_flag(sk, SOCK_BROADCAST, valbool);
493 break;
494 case SO_SNDBUF:
495 /* Don't error on this BSD doesn't and if you think
496 about it this is right. Otherwise apps have to
497 play 'guess the biggest size' games. RCVBUF/SNDBUF
498 are treated in BSD as hints */
499
500 if (val > sysctl_wmem_max)
501 val = sysctl_wmem_max;
b0573dea 502set_sndbuf:
e71a4783
SH		 503 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
504 if ((val * 2) < SOCK_MIN_SNDBUF)
505 sk->sk_sndbuf = SOCK_MIN_SNDBUF;
506 else
507 sk->sk_sndbuf = val * 2;
1da177e4 508
e71a4783
SH		 509 /*
510 * Wake up sending tasks if we
511 * upped the value.
512 */
513 sk->sk_write_space(sk);
514 break;
1da177e4 515
e71a4783
SH		 516 case SO_SNDBUFFORCE:
517 if (!capable(CAP_NET_ADMIN)) {
518 ret = -EPERM;
519 break;
520 }
521 goto set_sndbuf;
b0573dea 522
e71a4783
SH		 523 case SO_RCVBUF:
524 /* Don't error on this BSD doesn't and if you think
525 about it this is right. Otherwise apps have to
526 play 'guess the biggest size' games. RCVBUF/SNDBUF
527 are treated in BSD as hints */
4ec93edb 528
e71a4783
SH		 529 if (val > sysctl_rmem_max)
530 val = sysctl_rmem_max;
b0573dea 531set_rcvbuf:
e71a4783
SH		 532 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
533 /*
534 * We double it on the way in to account for
535 * "struct sk_buff" etc. overhead. Applications
536 * assume that the SO_RCVBUF setting they make will
537 * allow that much actual data to be received on that
538 * socket.
539 *
540 * Applications are unaware that "struct sk_buff" and
541 * other overheads allocate from the receive buffer
542 * during socket buffer allocation.
543 *
544 * And after considering the possible alternatives,
545 * returning the value we actually used in getsockopt
546 * is the most desirable behavior.
547 */
548 if ((val * 2) < SOCK_MIN_RCVBUF)
549 sk->sk_rcvbuf = SOCK_MIN_RCVBUF;
550 else
551 sk->sk_rcvbuf = val * 2;
552 break;
553
554 case SO_RCVBUFFORCE:
555 if (!capable(CAP_NET_ADMIN)) {
556 ret = -EPERM;
1da177e4 557 break;
e71a4783
SH		 558 }
559 goto set_rcvbuf;
1da177e4 560
e71a4783 561 case SO_KEEPALIVE:
1da177e4 562#ifdef CONFIG_INET
e71a4783
SH		 563 if (sk->sk_protocol == IPPROTO_TCP)
564 tcp_set_keepalive(sk, valbool);
1da177e4 565#endif
e71a4783
SH		 566 sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool);
567 break;
568
569 case SO_OOBINLINE:
570 sock_valbool_flag(sk, SOCK_URGINLINE, valbool);
571 break;
572
573 case SO_NO_CHECK:
574 sk->sk_no_check = valbool;
575 break;
576
577 case SO_PRIORITY:
578 if ((val >= 0 && val <= 6) || capable(CAP_NET_ADMIN))
579 sk->sk_priority = val;
580 else
581 ret = -EPERM;
582 break;
583
584 case SO_LINGER:
585 if (optlen < sizeof(ling)) {
586 ret = -EINVAL; /* 1003.1g */
1da177e4 587 break;
e71a4783 588 }
2a91525c 589 if (copy_from_user(&ling, optval, sizeof(ling))) {
e71a4783 590 ret = -EFAULT;
1da177e4 591 break;
e71a4783
SH		 592 }
593 if (!ling.l_onoff)
594 sock_reset_flag(sk, SOCK_LINGER);
595 else {
1da177e4 596#if (BITS_PER_LONG == 32)
e71a4783
SH		 597 if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ)
598 sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT;
1da177e4 599 else
e71a4783
SH		 600#endif
601 sk->sk_lingertime = (unsigned int)ling.l_linger * HZ;
602 sock_set_flag(sk, SOCK_LINGER);
603 }
604 break;
605
606 case SO_BSDCOMPAT:
607 sock_warn_obsolete_bsdism("setsockopt");
608 break;
609
610 case SO_PASSCRED:
611 if (valbool)
612 set_bit(SOCK_PASSCRED, &sock->flags);
613 else
614 clear_bit(SOCK_PASSCRED, &sock->flags);
615 break;
616
617 case SO_TIMESTAMP:
92f37fd2 618 case SO_TIMESTAMPNS:
e71a4783 619 if (valbool) {
92f37fd2
ED		 620 if (optname == SO_TIMESTAMP)
621 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
622 else
623 sock_set_flag(sk, SOCK_RCVTSTAMPNS);
e71a4783 624 sock_set_flag(sk, SOCK_RCVTSTAMP);
20d49473 625 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
92f37fd2 626 } else {
e71a4783 627 sock_reset_flag(sk, SOCK_RCVTSTAMP);
92f37fd2
ED		 628 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
629 }
e71a4783
SH		 630 break;
631
20d49473
PO		 632 case SO_TIMESTAMPING:
633 if (val & ~SOF_TIMESTAMPING_MASK) {
f249fb78 634 ret = -EINVAL;
20d49473
PO		 635 break;
636 }
637 sock_valbool_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE,
638 val & SOF_TIMESTAMPING_TX_HARDWARE);
639 sock_valbool_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE,
640 val & SOF_TIMESTAMPING_TX_SOFTWARE);
641 sock_valbool_flag(sk, SOCK_TIMESTAMPING_RX_HARDWARE,
642 val & SOF_TIMESTAMPING_RX_HARDWARE);
643 if (val & SOF_TIMESTAMPING_RX_SOFTWARE)
644 sock_enable_timestamp(sk,
645 SOCK_TIMESTAMPING_RX_SOFTWARE);
646 else
647 sock_disable_timestamp(sk,
648 SOCK_TIMESTAMPING_RX_SOFTWARE);
649 sock_valbool_flag(sk, SOCK_TIMESTAMPING_SOFTWARE,
650 val & SOF_TIMESTAMPING_SOFTWARE);
651 sock_valbool_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE,
652 val & SOF_TIMESTAMPING_SYS_HARDWARE);
653 sock_valbool_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE,
654 val & SOF_TIMESTAMPING_RAW_HARDWARE);
655 break;
656
e71a4783
SH		 657 case SO_RCVLOWAT:
658 if (val < 0)
659 val = INT_MAX;
660 sk->sk_rcvlowat = val ? : 1;
661 break;
662
663 case SO_RCVTIMEO:
664 ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen);
665 break;
666
667 case SO_SNDTIMEO:
668 ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen);
669 break;
1da177e4 670
e71a4783
SH		 671 case SO_ATTACH_FILTER:
672 ret = -EINVAL;
673 if (optlen == sizeof(struct sock_fprog)) {
674 struct sock_fprog fprog;
1da177e4 675
e71a4783
SH		 676 ret = -EFAULT;
677 if (copy_from_user(&fprog, optval, sizeof(fprog)))
1da177e4 678 break;
e71a4783
SH		 679
680 ret = sk_attach_filter(&fprog, sk);
681 }
682 break;
683
684 case SO_DETACH_FILTER:
55b33325 685 ret = sk_detach_filter(sk);
e71a4783 686 break;
1da177e4 687
e71a4783
SH		 688 case SO_PASSSEC:
689 if (valbool)
690 set_bit(SOCK_PASSSEC, &sock->flags);
691 else
692 clear_bit(SOCK_PASSSEC, &sock->flags);
693 break;
4a19ec58
LAT		 694 case SO_MARK:
695 if (!capable(CAP_NET_ADMIN))
696 ret = -EPERM;
2a91525c 697 else
4a19ec58 698 sk->sk_mark = val;
4a19ec58 699 break;
877ce7c1 700
1da177e4
LT		 701 /* We implement the SO_SNDLOWAT etc to
702 not be settable (1003.1g 5.3) */
e71a4783
SH		 703 default:
704 ret = -ENOPROTOOPT;
705 break;
4ec93edb 706 }
1da177e4
LT		 707 release_sock(sk);
708 return ret;
709}
2a91525c 710EXPORT_SYMBOL(sock_setsockopt);
1da177e4
LT		 711
712
713int sock_getsockopt(struct socket *sock, int level, int optname,
714 char __user *optval, int __user *optlen)
715{
716 struct sock *sk = sock->sk;
4ec93edb 717
e71a4783 718 union {
4ec93edb
YH		 719 int val;
720 struct linger ling;
1da177e4
LT		 721 struct timeval tm;
722 } v;
4ec93edb 723
1da177e4
LT		 724 unsigned int lv = sizeof(int);
725 int len;
4ec93edb 726
e71a4783 727 if (get_user(len, optlen))
4ec93edb 728 return -EFAULT;
e71a4783 729 if (len < 0)
1da177e4 730 return -EINVAL;
4ec93edb 731
50fee1de 732 memset(&v, 0, sizeof(v));
df0bca04 733
2a91525c 734 switch (optname) {
e71a4783
SH		 735 case SO_DEBUG:
736 v.val = sock_flag(sk, SOCK_DBG);
737 break;
738
739 case SO_DONTROUTE:
740 v.val = sock_flag(sk, SOCK_LOCALROUTE);
741 break;
742
743 case SO_BROADCAST:
744 v.val = !!sock_flag(sk, SOCK_BROADCAST);
745 break;
746
747 case SO_SNDBUF:
748 v.val = sk->sk_sndbuf;
749 break;
750
751 case SO_RCVBUF:
752 v.val = sk->sk_rcvbuf;
753 break;
754
755 case SO_REUSEADDR:
756 v.val = sk->sk_reuse;
757 break;
758
759 case SO_KEEPALIVE:
760 v.val = !!sock_flag(sk, SOCK_KEEPOPEN);
761 break;
762
763 case SO_TYPE:
764 v.val = sk->sk_type;
765 break;
766
767 case SO_ERROR:
768 v.val = -sock_error(sk);
2a91525c 769 if (v.val == 0)
e71a4783
SH		 770 v.val = xchg(&sk->sk_err_soft, 0);
771 break;
772
773 case SO_OOBINLINE:
774 v.val = !!sock_flag(sk, SOCK_URGINLINE);
775 break;
776
777 case SO_NO_CHECK:
778 v.val = sk->sk_no_check;
779 break;
780
781 case SO_PRIORITY:
782 v.val = sk->sk_priority;
783 break;
784
785 case SO_LINGER:
786 lv = sizeof(v.ling);
787 v.ling.l_onoff = !!sock_flag(sk, SOCK_LINGER);
788 v.ling.l_linger = sk->sk_lingertime / HZ;
789 break;
790
791 case SO_BSDCOMPAT:
792 sock_warn_obsolete_bsdism("getsockopt");
793 break;
794
795 case SO_TIMESTAMP:
92f37fd2
ED		 796 v.val = sock_flag(sk, SOCK_RCVTSTAMP) &&
797 !sock_flag(sk, SOCK_RCVTSTAMPNS);
798 break;
799
800 case SO_TIMESTAMPNS:
801 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS);
e71a4783
SH		 802 break;
803
20d49473
PO		 804 case SO_TIMESTAMPING:
805 v.val = 0;
806 if (sock_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE))
807 v.val |= SOF_TIMESTAMPING_TX_HARDWARE;
808 if (sock_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE))
809 v.val |= SOF_TIMESTAMPING_TX_SOFTWARE;
810 if (sock_flag(sk, SOCK_TIMESTAMPING_RX_HARDWARE))
811 v.val |= SOF_TIMESTAMPING_RX_HARDWARE;
812 if (sock_flag(sk, SOCK_TIMESTAMPING_RX_SOFTWARE))
813 v.val |= SOF_TIMESTAMPING_RX_SOFTWARE;
814 if (sock_flag(sk, SOCK_TIMESTAMPING_SOFTWARE))
815 v.val |= SOF_TIMESTAMPING_SOFTWARE;
816 if (sock_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE))
817 v.val |= SOF_TIMESTAMPING_SYS_HARDWARE;
818 if (sock_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE))
819 v.val |= SOF_TIMESTAMPING_RAW_HARDWARE;
820 break;
821
e71a4783 822 case SO_RCVTIMEO:
2a91525c 823 lv = sizeof(struct timeval);
e71a4783
SH		 824 if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) {
825 v.tm.tv_sec = 0;
826 v.tm.tv_usec = 0;
827 } else {
828 v.tm.tv_sec = sk->sk_rcvtimeo / HZ;
829 v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ;
830 }
831 break;
832
833 case SO_SNDTIMEO:
2a91525c 834 lv = sizeof(struct timeval);
e71a4783
SH		 835 if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) {
836 v.tm.tv_sec = 0;
837 v.tm.tv_usec = 0;
838 } else {
839 v.tm.tv_sec = sk->sk_sndtimeo / HZ;
840 v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ;
841 }
842 break;
1da177e4 843
e71a4783
SH		 844 case SO_RCVLOWAT:
845 v.val = sk->sk_rcvlowat;
846 break;
1da177e4 847
e71a4783 848 case SO_SNDLOWAT:
2a91525c 849 v.val = 1;
e71a4783 850 break;
1da177e4 851
e71a4783
SH		 852 case SO_PASSCRED:
853 v.val = test_bit(SOCK_PASSCRED, &sock->flags) ? 1 : 0;
854 break;
1da177e4 855
e71a4783
SH		 856 case SO_PEERCRED:
857 if (len > sizeof(sk->sk_peercred))
858 len = sizeof(sk->sk_peercred);
859 if (copy_to_user(optval, &sk->sk_peercred, len))
860 return -EFAULT;
861 goto lenout;
1da177e4 862
e71a4783
SH		 863 case SO_PEERNAME:
864 {
865 char address[128];
866
867 if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2))
868 return -ENOTCONN;
869 if (lv < len)
870 return -EINVAL;
871 if (copy_to_user(optval, address, len))
872 return -EFAULT;
873 goto lenout;
874 }
1da177e4 875
e71a4783
SH		 876 /* Dubious BSD thing... Probably nobody even uses it, but
877 * the UNIX standard wants it for whatever reason... -DaveM
878 */
879 case SO_ACCEPTCONN:
880 v.val = sk->sk_state == TCP_LISTEN;
881 break;
1da177e4 882
e71a4783
SH		 883 case SO_PASSSEC:
884 v.val = test_bit(SOCK_PASSSEC, &sock->flags) ? 1 : 0;
885 break;
877ce7c1 886
e71a4783
SH		 887 case SO_PEERSEC:
888 return security_socket_getpeersec_stream(sock, optval, optlen, len);
1da177e4 889
4a19ec58
LAT		 890 case SO_MARK:
891 v.val = sk->sk_mark;
892 break;
893
e71a4783
SH		 894 default:
895 return -ENOPROTOOPT;
1da177e4 896 }
e71a4783 897
1da177e4
LT		 898 if (len > lv)
899 len = lv;
900 if (copy_to_user(optval, &v, len))
901 return -EFAULT;
902lenout:
4ec93edb
YH		 903 if (put_user(len, optlen))
904 return -EFAULT;
905 return 0;
1da177e4
LT		 906}
907
a5b5bb9a
IM		 908/*
909 * Initialize an sk_lock.
910 *
911 * (We also register the sk_lock with the lock validator.)
912 */
b6f99a21 913static inline void sock_lock_init(struct sock *sk)
a5b5bb9a 914{
ed07536e
PZ		 915 sock_lock_init_class_and_name(sk,
916 af_family_slock_key_strings[sk->sk_family],
917 af_family_slock_keys + sk->sk_family,
918 af_family_key_strings[sk->sk_family],
919 af_family_keys + sk->sk_family);
a5b5bb9a
IM		 920}
921
4dc6dc71
ED		 922/*
923 * Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet,
924 * even temporarly, because of RCU lookups. sk_node should also be left as is.
925 */
f1a6c4da
PE		 926static void sock_copy(struct sock *nsk, const struct sock *osk)
927{
928#ifdef CONFIG_SECURITY_NETWORK
929 void *sptr = nsk->sk_security;
930#endif
4dc6dc71
ED		 931 BUILD_BUG_ON(offsetof(struct sock, sk_copy_start) !=
932 sizeof(osk->sk_node) + sizeof(osk->sk_refcnt));
933 memcpy(&nsk->sk_copy_start, &osk->sk_copy_start,
934 osk->sk_prot->obj_size - offsetof(struct sock, sk_copy_start));
f1a6c4da
PE		 935#ifdef CONFIG_SECURITY_NETWORK
936 nsk->sk_security = sptr;
937 security_sk_clone(osk, nsk);
938#endif
939}
940
2e4afe7b
PE		 941static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority,
942 int family)
c308c1b2
PE		 943{
944 struct sock *sk;
945 struct kmem_cache *slab;
946
947 slab = prot->slab;
e912b114
ED		 948 if (slab != NULL) {
949 sk = kmem_cache_alloc(slab, priority & ~__GFP_ZERO);
950 if (!sk)
951 return sk;
952 if (priority & __GFP_ZERO) {
953 /*
954 * caches using SLAB_DESTROY_BY_RCU should let
955 * sk_node.next un-modified. Special care is taken
956 * when initializing object to zero.
957 */
958 if (offsetof(struct sock, sk_node.next) != 0)
959 memset(sk, 0, offsetof(struct sock, sk_node.next));
960 memset(&sk->sk_node.pprev, 0,
961 prot->obj_size - offsetof(struct sock,
962 sk_node.pprev));
963 }
964 }
c308c1b2
PE		 965 else
966 sk = kmalloc(prot->obj_size, priority);
967
2e4afe7b 968 if (sk != NULL) {
a98b65a3
VN		 969 kmemcheck_annotate_bitfield(sk, flags);
970
2e4afe7b
PE		 971 if (security_sk_alloc(sk, family, priority))
972 goto out_free;
973
974 if (!try_module_get(prot->owner))
975 goto out_free_sec;
976 }
977
c308c1b2 978 return sk;
2e4afe7b
PE		 979
980out_free_sec:
981 security_sk_free(sk);
982out_free:
983 if (slab != NULL)
984 kmem_cache_free(slab, sk);
985 else
986 kfree(sk);
987 return NULL;
c308c1b2
PE		 988}
989
990static void sk_prot_free(struct proto *prot, struct sock *sk)
991{
992 struct kmem_cache *slab;
2e4afe7b 993 struct module *owner;
c308c1b2 994
2e4afe7b 995 owner = prot->owner;
c308c1b2 996 slab = prot->slab;
2e4afe7b
PE		 997
998 security_sk_free(sk);
c308c1b2
PE		 999 if (slab != NULL)
1000 kmem_cache_free(slab, sk);
1001 else
1002 kfree(sk);
2e4afe7b 1003 module_put(owner);
c308c1b2
PE		 1004}
1005
1da177e4
LT		 1006/**
1007 * sk_alloc - All socket objects are allocated here
c4ea43c5 1008 * @net: the applicable net namespace
4dc3b16b
PP		 1009 * @family: protocol family
1010 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1011 * @prot: struct proto associated with this new sock instance
1da177e4 1012 */
1b8d7ae4 1013struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
6257ff21 1014 struct proto *prot)
1da177e4 1015{
c308c1b2 1016 struct sock *sk;
1da177e4 1017
154adbc8 1018 sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family);
1da177e4 1019 if (sk) {
154adbc8
PE		 1020 sk->sk_family = family;
1021 /*
1022 * See comment in struct sock definition to understand
1023 * why we need sk_prot_creator -acme
1024 */
1025 sk->sk_prot = sk->sk_prot_creator = prot;
1026 sock_lock_init(sk);
3b1e0a65 1027 sock_net_set(sk, get_net(net));
1da177e4 1028 }
a79af59e 1029
2e4afe7b 1030 return sk;
1da177e4 1031}
2a91525c 1032EXPORT_SYMBOL(sk_alloc);
1da177e4 1033
2b85a34e 1034static void __sk_free(struct sock *sk)
1da177e4
LT		 1035{
1036 struct sk_filter *filter;
1da177e4
LT		 1037
1038 if (sk->sk_destruct)
1039 sk->sk_destruct(sk);
1040
fda9ef5d 1041 filter = rcu_dereference(sk->sk_filter);
1da177e4 1042 if (filter) {
309dd5fc 1043 sk_filter_uncharge(sk, filter);
fda9ef5d 1044 rcu_assign_pointer(sk->sk_filter, NULL);
1da177e4
LT		 1045 }
1046
20d49473
PO		 1047 sock_disable_timestamp(sk, SOCK_TIMESTAMP);
1048 sock_disable_timestamp(sk, SOCK_TIMESTAMPING_RX_SOFTWARE);
1da177e4
LT		 1049
1050 if (atomic_read(&sk->sk_omem_alloc))
1051 printk(KERN_DEBUG "%s: optmem leakage (%d bytes) detected.\n",
0dc47877 1052 __func__, atomic_read(&sk->sk_omem_alloc));
1da177e4 1053
3b1e0a65 1054 put_net(sock_net(sk));
c308c1b2 1055 sk_prot_free(sk->sk_prot_creator, sk);
1da177e4 1056}
2b85a34e
ED		 1057
1058void sk_free(struct sock *sk)
1059{
1060 /*
1061 * We substract one from sk_wmem_alloc and can know if
1062 * some packets are still in some tx queue.
1063 * If not null, sock_wfree() will call __sk_free(sk) later
1064 */
1065 if (atomic_dec_and_test(&sk->sk_wmem_alloc))
1066 __sk_free(sk);
1067}
2a91525c 1068EXPORT_SYMBOL(sk_free);
1da177e4 1069
edf02087
DL		 1070/*
1071 * Last sock_put should drop referrence to sk->sk_net. It has already
1072 * been dropped in sk_change_net. Taking referrence to stopping namespace
1073 * is not an option.
1074 * Take referrence to a socket to remove it from hash _alive_ and after that
1075 * destroy it in the context of init_net.
1076 */
1077void sk_release_kernel(struct sock *sk)
1078{
1079 if (sk == NULL || sk->sk_socket == NULL)
1080 return;
1081
1082 sock_hold(sk);
1083 sock_release(sk->sk_socket);
65a18ec5 1084 release_net(sock_net(sk));
3b1e0a65 1085 sock_net_set(sk, get_net(&init_net));
edf02087
DL		 1086 sock_put(sk);
1087}
45af1754 1088EXPORT_SYMBOL(sk_release_kernel);
edf02087 1089
dd0fc66f 1090struct sock *sk_clone(const struct sock *sk, const gfp_t priority)
87d11ceb 1091{
8fd1d178 1092 struct sock *newsk;
87d11ceb 1093
8fd1d178 1094 newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family);
87d11ceb
ACM		 1095 if (newsk != NULL) {
1096 struct sk_filter *filter;
1097
892c141e 1098 sock_copy(newsk, sk);
87d11ceb
ACM		 1099
1100 /* SANITY */
3b1e0a65 1101 get_net(sock_net(newsk));
87d11ceb
ACM		 1102 sk_node_init(&newsk->sk_node);
1103 sock_lock_init(newsk);
1104 bh_lock_sock(newsk);
fa438ccf 1105 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL;
87d11ceb
ACM		 1106
1107 atomic_set(&newsk->sk_rmem_alloc, 0);
2b85a34e
ED		 1108 /*
1109 * sk_wmem_alloc set to one (see sk_free() and sock_wfree())
1110 */
1111 atomic_set(&newsk->sk_wmem_alloc, 1);
87d11ceb
ACM		 1112 atomic_set(&newsk->sk_omem_alloc, 0);
1113 skb_queue_head_init(&newsk->sk_receive_queue);
1114 skb_queue_head_init(&newsk->sk_write_queue);
97fc2f08
CL		 1115#ifdef CONFIG_NET_DMA
1116 skb_queue_head_init(&newsk->sk_async_wait_queue);
1117#endif
87d11ceb
ACM		 1118
1119 rwlock_init(&newsk->sk_dst_lock);
1120 rwlock_init(&newsk->sk_callback_lock);
443aef0e
PZ		 1121 lockdep_set_class_and_name(&newsk->sk_callback_lock,
1122 af_callback_keys + newsk->sk_family,
1123 af_family_clock_key_strings[newsk->sk_family]);
87d11ceb
ACM		 1124
1125 newsk->sk_dst_cache = NULL;
1126 newsk->sk_wmem_queued = 0;
1127 newsk->sk_forward_alloc = 0;
1128 newsk->sk_send_head = NULL;
87d11ceb
ACM		 1129 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
1130
1131 sock_reset_flag(newsk, SOCK_DONE);
1132 skb_queue_head_init(&newsk->sk_error_queue);
1133
1134 filter = newsk->sk_filter;
1135 if (filter != NULL)
1136 sk_filter_charge(newsk, filter);
1137
1138 if (unlikely(xfrm_sk_clone_policy(newsk))) {
1139 /* It is still raw copy of parent, so invalidate
1140 * destructor and make plain sk_free() */
1141 newsk->sk_destruct = NULL;
1142 sk_free(newsk);
1143 newsk = NULL;
1144 goto out;
1145 }
1146
1147 newsk->sk_err = 0;
1148 newsk->sk_priority = 0;
4dc6dc71
ED		 1149 /*
1150 * Before updating sk_refcnt, we must commit prior changes to memory
1151 * (Documentation/RCU/rculist_nulls.txt for details)
1152 */
1153 smp_wmb();
87d11ceb
ACM		 1154 atomic_set(&newsk->sk_refcnt, 2);
1155
1156 /*
1157 * Increment the counter in the same struct proto as the master
1158 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
1159 * is the same as sk->sk_prot->socks, as this field was copied
1160 * with memcpy).
1161 *
1162 * This _changes_ the previous behaviour, where
1163 * tcp_create_openreq_child always was incrementing the
1164 * equivalent to tcp_prot->socks (inet_sock_nr), so this have
1165 * to be taken into account in all callers. -acme
1166 */
1167 sk_refcnt_debug_inc(newsk);
972692e0 1168 sk_set_socket(newsk, NULL);
87d11ceb
ACM		 1169 newsk->sk_sleep = NULL;
1170
1171 if (newsk->sk_prot->sockets_allocated)
1748376b 1172 percpu_counter_inc(newsk->sk_prot->sockets_allocated);
87d11ceb
ACM		 1173 }
1174out:
1175 return newsk;
1176}
87d11ceb
ACM		 1177EXPORT_SYMBOL_GPL(sk_clone);
1178
9958089a
AK		 1179void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
1180{
1181 __sk_dst_set(sk, dst);
1182 sk->sk_route_caps = dst->dev->features;
1183 if (sk->sk_route_caps & NETIF_F_GSO)
4fcd6b99 1184 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE;
9958089a 1185 if (sk_can_gso(sk)) {
82cc1a7a 1186 if (dst->header_len) {
9958089a 1187 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
82cc1a7a 1188 } else {
9958089a 1189 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
82cc1a7a
PWJ		 1190 sk->sk_gso_max_size = dst->dev->gso_max_size;
1191 }
9958089a
AK		 1192 }
1193}
1194EXPORT_SYMBOL_GPL(sk_setup_caps);
1195
1da177e4
LT		 1196void __init sk_init(void)
1197{
1198 if (num_physpages <= 4096) {
1199 sysctl_wmem_max = 32767;
1200 sysctl_rmem_max = 32767;
1201 sysctl_wmem_default = 32767;
1202 sysctl_rmem_default = 32767;
1203 } else if (num_physpages >= 131072) {
1204 sysctl_wmem_max = 131071;
1205 sysctl_rmem_max = 131071;
1206 }
1207}
1208
1209/*
1210 * Simple resource managers for sockets.
1211 */
1212
1213
4ec93edb
YH		 1214/*
1215 * Write buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1216 */
1217void sock_wfree(struct sk_buff *skb)
1218{
1219 struct sock *sk = skb->sk;
2b85a34e 1220 int res;
1da177e4
LT		 1221
1222 /* In case it might be waiting for more memory. */
2b85a34e 1223 res = atomic_sub_return(skb->truesize, &sk->sk_wmem_alloc);
1da177e4
LT		 1224 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE))
1225 sk->sk_write_space(sk);
2b85a34e
ED		 1226 /*
1227 * if sk_wmem_alloc reached 0, we are last user and should
1228 * free this sock, as sk_free() call could not do it.
1229 */
1230 if (res == 0)
1231 __sk_free(sk);
1da177e4 1232}
2a91525c 1233EXPORT_SYMBOL(sock_wfree);
1da177e4 1234
4ec93edb
YH		 1235/*
1236 * Read buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1237 */
1238void sock_rfree(struct sk_buff *skb)
1239{
1240 struct sock *sk = skb->sk;
1241
1242 atomic_sub(skb->truesize, &sk->sk_rmem_alloc);
3ab224be 1243 sk_mem_uncharge(skb->sk, skb->truesize);
1da177e4 1244}
2a91525c 1245EXPORT_SYMBOL(sock_rfree);
1da177e4
LT		 1246
1247
1248int sock_i_uid(struct sock *sk)
1249{
1250 int uid;
1251
1252 read_lock(&sk->sk_callback_lock);
1253 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : 0;
1254 read_unlock(&sk->sk_callback_lock);
1255 return uid;
1256}
2a91525c 1257EXPORT_SYMBOL(sock_i_uid);
1da177e4
LT		 1258
1259unsigned long sock_i_ino(struct sock *sk)
1260{
1261 unsigned long ino;
1262
1263 read_lock(&sk->sk_callback_lock);
1264 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
1265 read_unlock(&sk->sk_callback_lock);
1266 return ino;
1267}
2a91525c 1268EXPORT_SYMBOL(sock_i_ino);
1da177e4
LT		 1269
1270/*
1271 * Allocate a skb from the socket's send buffer.
1272 */
86a76caf 1273struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
dd0fc66f 1274 gfp_t priority)
1da177e4
LT		 1275{
1276 if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
2a91525c 1277 struct sk_buff *skb = alloc_skb(size, priority);
1da177e4
LT		 1278 if (skb) {
1279 skb_set_owner_w(skb, sk);
1280 return skb;
1281 }
1282 }
1283 return NULL;
1284}
2a91525c 1285EXPORT_SYMBOL(sock_wmalloc);
1da177e4
LT		 1286
1287/*
1288 * Allocate a skb from the socket's receive buffer.
4ec93edb 1289 */
86a76caf 1290struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force,
dd0fc66f 1291 gfp_t priority)
1da177e4
LT		 1292{
1293 if (force || atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) {
1294 struct sk_buff *skb = alloc_skb(size, priority);
1295 if (skb) {
1296 skb_set_owner_r(skb, sk);
1297 return skb;
1298 }
1299 }
1300 return NULL;
1301}
1302
4ec93edb 1303/*
1da177e4 1304 * Allocate a memory block from the socket's option memory buffer.
4ec93edb 1305 */
dd0fc66f 1306void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
1da177e4
LT		 1307{
1308 if ((unsigned)size <= sysctl_optmem_max &&
1309 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) {
1310 void *mem;
1311 /* First do the add, to avoid the race if kmalloc
4ec93edb 1312 * might sleep.
1da177e4
LT		 1313 */
1314 atomic_add(size, &sk->sk_omem_alloc);
1315 mem = kmalloc(size, priority);
1316 if (mem)
1317 return mem;
1318 atomic_sub(size, &sk->sk_omem_alloc);
1319 }
1320 return NULL;
1321}
2a91525c 1322EXPORT_SYMBOL(sock_kmalloc);
1da177e4
LT		 1323
1324/*
1325 * Free an option memory block.
1326 */
1327void sock_kfree_s(struct sock *sk, void *mem, int size)
1328{
1329 kfree(mem);
1330 atomic_sub(size, &sk->sk_omem_alloc);
1331}
2a91525c 1332EXPORT_SYMBOL(sock_kfree_s);
1da177e4
LT		 1333
1334/* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
1335 I think, these locks should be removed for datagram sockets.
1336 */
2a91525c 1337static long sock_wait_for_wmem(struct sock *sk, long timeo)
1da177e4
LT		 1338{
1339 DEFINE_WAIT(wait);
1340
1341 clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1342 for (;;) {
1343 if (!timeo)
1344 break;
1345 if (signal_pending(current))
1346 break;
1347 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1348 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
1349 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf)
1350 break;
1351 if (sk->sk_shutdown & SEND_SHUTDOWN)
1352 break;
1353 if (sk->sk_err)
1354 break;
1355 timeo = schedule_timeout(timeo);
1356 }
1357 finish_wait(sk->sk_sleep, &wait);
1358 return timeo;
1359}
1360
1361
1362/*
1363 * Generic send/receive buffer handlers
1364 */
1365
4cc7f68d
HX		 1366struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len,
1367 unsigned long data_len, int noblock,
1368 int *errcode)
1da177e4
LT		 1369{
1370 struct sk_buff *skb;
7d877f3b 1371 gfp_t gfp_mask;
1da177e4
LT		 1372 long timeo;
1373 int err;
1374
1375 gfp_mask = sk->sk_allocation;
1376 if (gfp_mask & __GFP_WAIT)
1377 gfp_mask |= __GFP_REPEAT;
1378
1379 timeo = sock_sndtimeo(sk, noblock);
1380 while (1) {
1381 err = sock_error(sk);
1382 if (err != 0)
1383 goto failure;
1384
1385 err = -EPIPE;
1386 if (sk->sk_shutdown & SEND_SHUTDOWN)
1387 goto failure;
1388
1389 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
db38c179 1390 skb = alloc_skb(header_len, gfp_mask);
1da177e4
LT		 1391 if (skb) {
1392 int npages;
1393 int i;
1394
1395 /* No pages, we're done... */
1396 if (!data_len)
1397 break;
1398
1399 npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
1400 skb->truesize += data_len;
1401 skb_shinfo(skb)->nr_frags = npages;
1402 for (i = 0; i < npages; i++) {
1403 struct page *page;
1404 skb_frag_t *frag;
1405
1406 page = alloc_pages(sk->sk_allocation, 0);
1407 if (!page) {
1408 err = -ENOBUFS;
1409 skb_shinfo(skb)->nr_frags = i;
1410 kfree_skb(skb);
1411 goto failure;
1412 }
1413
1414 frag = &skb_shinfo(skb)->frags[i];
1415 frag->page = page;
1416 frag->page_offset = 0;
1417 frag->size = (data_len >= PAGE_SIZE ?
1418 PAGE_SIZE :
1419 data_len);
1420 data_len -= PAGE_SIZE;
1421 }
1422
1423 /* Full success... */
1424 break;
1425 }
1426 err = -ENOBUFS;
1427 goto failure;
1428 }
1429 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1430 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1431 err = -EAGAIN;
1432 if (!timeo)
1433 goto failure;
1434 if (signal_pending(current))
1435 goto interrupted;
1436 timeo = sock_wait_for_wmem(sk, timeo);
1437 }
1438
1439 skb_set_owner_w(skb, sk);
1440 return skb;
1441
1442interrupted:
1443 err = sock_intr_errno(timeo);
1444failure:
1445 *errcode = err;
1446 return NULL;
1447}
4cc7f68d 1448EXPORT_SYMBOL(sock_alloc_send_pskb);
1da177e4 1449
4ec93edb 1450struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
1da177e4
LT		 1451 int noblock, int *errcode)
1452{
1453 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode);
1454}
2a91525c 1455EXPORT_SYMBOL(sock_alloc_send_skb);
1da177e4
LT		 1456
1457static void __lock_sock(struct sock *sk)
1458{
1459 DEFINE_WAIT(wait);
1460
e71a4783 1461 for (;;) {
1da177e4
LT		 1462 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
1463 TASK_UNINTERRUPTIBLE);
1464 spin_unlock_bh(&sk->sk_lock.slock);
1465 schedule();
1466 spin_lock_bh(&sk->sk_lock.slock);
e71a4783 1467 if (!sock_owned_by_user(sk))
1da177e4
LT		 1468 break;
1469 }
1470 finish_wait(&sk->sk_lock.wq, &wait);
1471}
1472
1473static void __release_sock(struct sock *sk)
1474{
1475 struct sk_buff *skb = sk->sk_backlog.head;
1476
1477 do {
1478 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
1479 bh_unlock_sock(sk);
1480
1481 do {
1482 struct sk_buff *next = skb->next;
1483
1484 skb->next = NULL;
c57943a1 1485 sk_backlog_rcv(sk, skb);
1da177e4
LT		 1486
1487 /*
1488 * We are in process context here with softirqs
1489 * disabled, use cond_resched_softirq() to preempt.
1490 * This is safe to do because we've taken the backlog
1491 * queue private:
1492 */
1493 cond_resched_softirq();
1494
1495 skb = next;
1496 } while (skb != NULL);
1497
1498 bh_lock_sock(sk);
e71a4783 1499 } while ((skb = sk->sk_backlog.head) != NULL);
1da177e4
LT		 1500}
1501
1502/**
1503 * sk_wait_data - wait for data to arrive at sk_receive_queue
4dc3b16b
PP		 1504 * @sk: sock to wait on
1505 * @timeo: for how long
1da177e4
LT		 1506 *
1507 * Now socket state including sk->sk_err is changed only under lock,
1508 * hence we may omit checks after joining wait queue.
1509 * We check receive queue before schedule() only as optimization;
1510 * it is very likely that release_sock() added new data.
1511 */
1512int sk_wait_data(struct sock *sk, long *timeo)
1513{
1514 int rc;
1515 DEFINE_WAIT(wait);
1516
1517 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
1518 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1519 rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue));
1520 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1521 finish_wait(sk->sk_sleep, &wait);
1522 return rc;
1523}
1da177e4
LT		 1524EXPORT_SYMBOL(sk_wait_data);
1525
3ab224be
HA		 1526/**
1527 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated
1528 * @sk: socket
1529 * @size: memory size to allocate
1530 * @kind: allocation type
1531 *
1532 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means
1533 * rmem allocation. This function assumes that protocols which have
1534 * memory_pressure use sk_wmem_queued as write buffer accounting.
1535 */
1536int __sk_mem_schedule(struct sock *sk, int size, int kind)
1537{
1538 struct proto *prot = sk->sk_prot;
1539 int amt = sk_mem_pages(size);
1540 int allocated;
1541
1542 sk->sk_forward_alloc += amt * SK_MEM_QUANTUM;
1543 allocated = atomic_add_return(amt, prot->memory_allocated);
1544
1545 /* Under limit. */
1546 if (allocated <= prot->sysctl_mem[0]) {
1547 if (prot->memory_pressure && *prot->memory_pressure)
1548 *prot->memory_pressure = 0;
1549 return 1;
1550 }
1551
1552 /* Under pressure. */
1553 if (allocated > prot->sysctl_mem[1])
1554 if (prot->enter_memory_pressure)
5c52ba17 1555 prot->enter_memory_pressure(sk);
3ab224be
HA		 1556
1557 /* Over hard limit. */
1558 if (allocated > prot->sysctl_mem[2])
1559 goto suppress_allocation;
1560
1561 /* guarantee minimum buffer size under pressure */
1562 if (kind == SK_MEM_RECV) {
1563 if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0])
1564 return 1;
1565 } else { /* SK_MEM_SEND */
1566 if (sk->sk_type == SOCK_STREAM) {
1567 if (sk->sk_wmem_queued < prot->sysctl_wmem[0])
1568 return 1;
1569 } else if (atomic_read(&sk->sk_wmem_alloc) <
1570 prot->sysctl_wmem[0])
1571 return 1;
1572 }
1573
1574 if (prot->memory_pressure) {
1748376b
ED		 1575 int alloc;
1576
1577 if (!*prot->memory_pressure)
1578 return 1;
1579 alloc = percpu_counter_read_positive(prot->sockets_allocated);
1580 if (prot->sysctl_mem[2] > alloc *
3ab224be
HA		 1581 sk_mem_pages(sk->sk_wmem_queued +
1582 atomic_read(&sk->sk_rmem_alloc) +
1583 sk->sk_forward_alloc))
1584 return 1;
1585 }
1586
1587suppress_allocation:
1588
1589 if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) {
1590 sk_stream_moderate_sndbuf(sk);
1591
1592 /* Fail only if socket is _under_ its sndbuf.
1593 * In this case we cannot block, so that we have to fail.
1594 */
1595 if (sk->sk_wmem_queued + size >= sk->sk_sndbuf)
1596 return 1;
1597 }
1598
1599 /* Alas. Undo changes. */
1600 sk->sk_forward_alloc -= amt * SK_MEM_QUANTUM;
1601 atomic_sub(amt, prot->memory_allocated);
1602 return 0;
1603}
3ab224be
HA		 1604EXPORT_SYMBOL(__sk_mem_schedule);
1605
1606/**
1607 * __sk_reclaim - reclaim memory_allocated
1608 * @sk: socket
1609 */
1610void __sk_mem_reclaim(struct sock *sk)
1611{
1612 struct proto *prot = sk->sk_prot;
1613
680a5a50 1614 atomic_sub(sk->sk_forward_alloc >> SK_MEM_QUANTUM_SHIFT,
3ab224be
HA		 1615 prot->memory_allocated);
1616 sk->sk_forward_alloc &= SK_MEM_QUANTUM - 1;
1617
1618 if (prot->memory_pressure && *prot->memory_pressure &&
1619 (atomic_read(prot->memory_allocated) < prot->sysctl_mem[0]))
1620 *prot->memory_pressure = 0;
1621}
3ab224be
HA		 1622EXPORT_SYMBOL(__sk_mem_reclaim);
1623
1624
1da177e4
LT		 1625/*
1626 * Set of default routines for initialising struct proto_ops when
1627 * the protocol does not support a particular function. In certain
1628 * cases where it makes no sense for a protocol to have a "do nothing"
1629 * function, some default processing is provided.
1630 */
1631
1632int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
1633{
1634 return -EOPNOTSUPP;
1635}
2a91525c 1636EXPORT_SYMBOL(sock_no_bind);
1da177e4 1637
4ec93edb 1638int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 1639 int len, int flags)
1640{
1641 return -EOPNOTSUPP;
1642}
2a91525c 1643EXPORT_SYMBOL(sock_no_connect);
1da177e4
LT		 1644
1645int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
1646{
1647 return -EOPNOTSUPP;
1648}
2a91525c 1649EXPORT_SYMBOL(sock_no_socketpair);
1da177e4
LT		 1650
1651int sock_no_accept(struct socket *sock, struct socket *newsock, int flags)
1652{
1653 return -EOPNOTSUPP;
1654}
2a91525c 1655EXPORT_SYMBOL(sock_no_accept);
1da177e4 1656
4ec93edb 1657int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 1658 int *len, int peer)
1659{
1660 return -EOPNOTSUPP;
1661}
2a91525c 1662EXPORT_SYMBOL(sock_no_getname);
1da177e4 1663
2a91525c 1664unsigned int sock_no_poll(struct file *file, struct socket *sock, poll_table *pt)
1da177e4
LT		 1665{
1666 return 0;
1667}
2a91525c 1668EXPORT_SYMBOL(sock_no_poll);
1da177e4
LT		 1669
1670int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1671{
1672 return -EOPNOTSUPP;
1673}
2a91525c 1674EXPORT_SYMBOL(sock_no_ioctl);
1da177e4
LT		 1675
1676int sock_no_listen(struct socket *sock, int backlog)
1677{
1678 return -EOPNOTSUPP;
1679}
2a91525c 1680EXPORT_SYMBOL(sock_no_listen);
1da177e4
LT		 1681
1682int sock_no_shutdown(struct socket *sock, int how)
1683{
1684 return -EOPNOTSUPP;
1685}
2a91525c 1686EXPORT_SYMBOL(sock_no_shutdown);
1da177e4
LT		 1687
1688int sock_no_setsockopt(struct socket *sock, int level, int optname,
1689 char __user *optval, int optlen)
1690{
1691 return -EOPNOTSUPP;
1692}
2a91525c 1693EXPORT_SYMBOL(sock_no_setsockopt);
1da177e4
LT		 1694
1695int sock_no_getsockopt(struct socket *sock, int level, int optname,
1696 char __user *optval, int __user *optlen)
1697{
1698 return -EOPNOTSUPP;
1699}
2a91525c 1700EXPORT_SYMBOL(sock_no_getsockopt);
1da177e4
LT		 1701
1702int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
1703 size_t len)
1704{
1705 return -EOPNOTSUPP;
1706}
2a91525c 1707EXPORT_SYMBOL(sock_no_sendmsg);
1da177e4
LT		 1708
1709int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
1710 size_t len, int flags)
1711{
1712 return -EOPNOTSUPP;
1713}
2a91525c 1714EXPORT_SYMBOL(sock_no_recvmsg);
1da177e4
LT		 1715
1716int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
1717{
1718 /* Mirror missing mmap method error code */
1719 return -ENODEV;
1720}
2a91525c 1721EXPORT_SYMBOL(sock_no_mmap);
1da177e4
LT		 1722
1723ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
1724{
1725 ssize_t res;
1726 struct msghdr msg = {.msg_flags = flags};
1727 struct kvec iov;
1728 char *kaddr = kmap(page);
1729 iov.iov_base = kaddr + offset;
1730 iov.iov_len = size;
1731 res = kernel_sendmsg(sock, &msg, &iov, 1, size);
1732 kunmap(page);
1733 return res;
1734}
2a91525c 1735EXPORT_SYMBOL(sock_no_sendpage);
1da177e4
LT		 1736
1737/*
1738 * Default Socket Callbacks
1739 */
1740
1741static void sock_def_wakeup(struct sock *sk)
1742{
1743 read_lock(&sk->sk_callback_lock);
a57de0b4 1744 if (sk_has_sleeper(sk))
1da177e4
LT		 1745 wake_up_interruptible_all(sk->sk_sleep);
1746 read_unlock(&sk->sk_callback_lock);
1747}
1748
1749static void sock_def_error_report(struct sock *sk)
1750{
1751 read_lock(&sk->sk_callback_lock);
a57de0b4 1752 if (sk_has_sleeper(sk))
37e5540b 1753 wake_up_interruptible_poll(sk->sk_sleep, POLLERR);
8d8ad9d7 1754 sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR);
1da177e4
LT		 1755 read_unlock(&sk->sk_callback_lock);
1756}
1757
1758static void sock_def_readable(struct sock *sk, int len)
1759{
1760 read_lock(&sk->sk_callback_lock);
a57de0b4 1761 if (sk_has_sleeper(sk))
37e5540b
DL		 1762 wake_up_interruptible_sync_poll(sk->sk_sleep, POLLIN |
1763 POLLRDNORM | POLLRDBAND);
8d8ad9d7 1764 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
1da177e4
LT		 1765 read_unlock(&sk->sk_callback_lock);
1766}
1767
1768static void sock_def_write_space(struct sock *sk)
1769{
1770 read_lock(&sk->sk_callback_lock);
1771
1772 /* Do not wake up a writer until he can make "significant"
1773 * progress. --DaveM
1774 */
e71a4783 1775 if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) {
a57de0b4 1776 if (sk_has_sleeper(sk))
37e5540b
DL		 1777 wake_up_interruptible_sync_poll(sk->sk_sleep, POLLOUT |
1778 POLLWRNORM | POLLWRBAND);
1da177e4
LT		 1779
1780 /* Should agree with poll, otherwise some programs break */
1781 if (sock_writeable(sk))
8d8ad9d7 1782 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
1da177e4
LT		 1783 }
1784
1785 read_unlock(&sk->sk_callback_lock);
1786}
1787
1788static void sock_def_destruct(struct sock *sk)
1789{
a51482bd 1790 kfree(sk->sk_protinfo);
1da177e4
LT		 1791}
1792
1793void sk_send_sigurg(struct sock *sk)
1794{
1795 if (sk->sk_socket && sk->sk_socket->file)
1796 if (send_sigurg(&sk->sk_socket->file->f_owner))
8d8ad9d7 1797 sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI);
1da177e4 1798}
2a91525c 1799EXPORT_SYMBOL(sk_send_sigurg);
1da177e4
LT		 1800
1801void sk_reset_timer(struct sock *sk, struct timer_list* timer,
1802 unsigned long expires)
1803{
1804 if (!mod_timer(timer, expires))
1805 sock_hold(sk);
1806}
1da177e4
LT		 1807EXPORT_SYMBOL(sk_reset_timer);
1808
1809void sk_stop_timer(struct sock *sk, struct timer_list* timer)
1810{
1811 if (timer_pending(timer) && del_timer(timer))
1812 __sock_put(sk);
1813}
1da177e4
LT		 1814EXPORT_SYMBOL(sk_stop_timer);
1815
1816void sock_init_data(struct socket *sock, struct sock *sk)
1817{
1818 skb_queue_head_init(&sk->sk_receive_queue);
1819 skb_queue_head_init(&sk->sk_write_queue);
1820 skb_queue_head_init(&sk->sk_error_queue);
97fc2f08
CL		 1821#ifdef CONFIG_NET_DMA
1822 skb_queue_head_init(&sk->sk_async_wait_queue);
1823#endif
1da177e4
LT		 1824
1825 sk->sk_send_head = NULL;
1826
1827 init_timer(&sk->sk_timer);
4ec93edb 1828
1da177e4
LT		 1829 sk->sk_allocation = GFP_KERNEL;
1830 sk->sk_rcvbuf = sysctl_rmem_default;
1831 sk->sk_sndbuf = sysctl_wmem_default;
1832 sk->sk_state = TCP_CLOSE;
972692e0 1833 sk_set_socket(sk, sock);
1da177e4
LT		 1834
1835 sock_set_flag(sk, SOCK_ZAPPED);
1836
e71a4783 1837 if (sock) {
1da177e4
LT		 1838 sk->sk_type = sock->type;
1839 sk->sk_sleep = &sock->wait;
1840 sock->sk = sk;
1841 } else
1842 sk->sk_sleep = NULL;
1843
1844 rwlock_init(&sk->sk_dst_lock);
1845 rwlock_init(&sk->sk_callback_lock);
443aef0e
PZ		 1846 lockdep_set_class_and_name(&sk->sk_callback_lock,
1847 af_callback_keys + sk->sk_family,
1848 af_family_clock_key_strings[sk->sk_family]);
1da177e4
LT		 1849
1850 sk->sk_state_change = sock_def_wakeup;
1851 sk->sk_data_ready = sock_def_readable;
1852 sk->sk_write_space = sock_def_write_space;
1853 sk->sk_error_report = sock_def_error_report;
1854 sk->sk_destruct = sock_def_destruct;
1855
1856 sk->sk_sndmsg_page = NULL;
1857 sk->sk_sndmsg_off = 0;
1858
1859 sk->sk_peercred.pid = 0;
1860 sk->sk_peercred.uid = -1;
1861 sk->sk_peercred.gid = -1;
1862 sk->sk_write_pending = 0;
1863 sk->sk_rcvlowat = 1;
1864 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
1865 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
1866
f37f0afb 1867 sk->sk_stamp = ktime_set(-1L, 0);
1da177e4 1868
4dc6dc71
ED		 1869 /*
1870 * Before updating sk_refcnt, we must commit prior changes to memory
1871 * (Documentation/RCU/rculist_nulls.txt for details)
1872 */
1873 smp_wmb();
1da177e4 1874 atomic_set(&sk->sk_refcnt, 1);
2b85a34e 1875 atomic_set(&sk->sk_wmem_alloc, 1);
33c732c3 1876 atomic_set(&sk->sk_drops, 0);
1da177e4 1877}
2a91525c 1878EXPORT_SYMBOL(sock_init_data);
1da177e4 1879
b5606c2d 1880void lock_sock_nested(struct sock *sk, int subclass)
1da177e4
LT		 1881{
1882 might_sleep();
a5b5bb9a 1883 spin_lock_bh(&sk->sk_lock.slock);
d2e9117c 1884 if (sk->sk_lock.owned)
1da177e4 1885 __lock_sock(sk);
d2e9117c 1886 sk->sk_lock.owned = 1;
a5b5bb9a
IM		 1887 spin_unlock(&sk->sk_lock.slock);
1888 /*
1889 * The sk_lock has mutex_lock() semantics here:
1890 */
fcc70d5f 1891 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
a5b5bb9a 1892 local_bh_enable();
1da177e4 1893}
fcc70d5f 1894EXPORT_SYMBOL(lock_sock_nested);
1da177e4 1895
b5606c2d 1896void release_sock(struct sock *sk)
1da177e4 1897{
a5b5bb9a
IM		 1898 /*
1899 * The sk_lock has mutex_unlock() semantics:
1900 */
1901 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
1902
1903 spin_lock_bh(&sk->sk_lock.slock);
1da177e4
LT		 1904 if (sk->sk_backlog.tail)
1905 __release_sock(sk);
d2e9117c 1906 sk->sk_lock.owned = 0;
a5b5bb9a
IM		 1907 if (waitqueue_active(&sk->sk_lock.wq))
1908 wake_up(&sk->sk_lock.wq);
1909 spin_unlock_bh(&sk->sk_lock.slock);
1da177e4
LT		 1910}
1911EXPORT_SYMBOL(release_sock);
1912
1913int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
4ec93edb 1914{
b7aa0bf7 1915 struct timeval tv;
1da177e4 1916 if (!sock_flag(sk, SOCK_TIMESTAMP))
20d49473 1917 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
b7aa0bf7
ED		 1918 tv = ktime_to_timeval(sk->sk_stamp);
1919 if (tv.tv_sec == -1)
1da177e4 1920 return -ENOENT;
b7aa0bf7
ED		 1921 if (tv.tv_sec == 0) {
1922 sk->sk_stamp = ktime_get_real();
1923 tv = ktime_to_timeval(sk->sk_stamp);
1924 }
1925 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0;
4ec93edb 1926}
1da177e4
LT		 1927EXPORT_SYMBOL(sock_get_timestamp);
1928
ae40eb1e
ED		 1929int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
1930{
1931 struct timespec ts;
1932 if (!sock_flag(sk, SOCK_TIMESTAMP))
20d49473 1933 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
ae40eb1e
ED		 1934 ts = ktime_to_timespec(sk->sk_stamp);
1935 if (ts.tv_sec == -1)
1936 return -ENOENT;
1937 if (ts.tv_sec == 0) {
1938 sk->sk_stamp = ktime_get_real();
1939 ts = ktime_to_timespec(sk->sk_stamp);
1940 }
1941 return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0;
1942}
1943EXPORT_SYMBOL(sock_get_timestampns);
1944
20d49473 1945void sock_enable_timestamp(struct sock *sk, int flag)
4ec93edb 1946{
20d49473
PO		 1947 if (!sock_flag(sk, flag)) {
1948 sock_set_flag(sk, flag);
1949 /*
1950 * we just set one of the two flags which require net
1951 * time stamping, but time stamping might have been on
1952 * already because of the other one
1953 */
1954 if (!sock_flag(sk,
1955 flag == SOCK_TIMESTAMP ?
1956 SOCK_TIMESTAMPING_RX_SOFTWARE :
1957 SOCK_TIMESTAMP))
1958 net_enable_timestamp();
1da177e4
LT		 1959 }
1960}
1da177e4
LT		 1961
1962/*
1963 * Get a socket option on an socket.
1964 *
1965 * FIX: POSIX 1003.1g is very ambiguous here. It states that
1966 * asynchronous errors should be reported by getsockopt. We assume
1967 * this means if you specify SO_ERROR (otherwise whats the point of it).
1968 */
1969int sock_common_getsockopt(struct socket *sock, int level, int optname,
1970 char __user *optval, int __user *optlen)
1971{
1972 struct sock *sk = sock->sk;
1973
1974 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
1975}
1da177e4
LT		 1976EXPORT_SYMBOL(sock_common_getsockopt);
1977
3fdadf7d 1978#ifdef CONFIG_COMPAT
543d9cfe
ACM		 1979int compat_sock_common_getsockopt(struct socket *sock, int level, int optname,
1980 char __user *optval, int __user *optlen)
3fdadf7d
DM		 1981{
1982 struct sock *sk = sock->sk;
1983
1e51f951 1984 if (sk->sk_prot->compat_getsockopt != NULL)
543d9cfe
ACM		 1985 return sk->sk_prot->compat_getsockopt(sk, level, optname,
1986 optval, optlen);
3fdadf7d
DM		 1987 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
1988}
1989EXPORT_SYMBOL(compat_sock_common_getsockopt);
1990#endif
1991
1da177e4
LT		 1992int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock,
1993 struct msghdr *msg, size_t size, int flags)
1994{
1995 struct sock *sk = sock->sk;
1996 int addr_len = 0;
1997 int err;
1998
1999 err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT,
2000 flags & ~MSG_DONTWAIT, &addr_len);
2001 if (err >= 0)
2002 msg->msg_namelen = addr_len;
2003 return err;
2004}
1da177e4
LT		 2005EXPORT_SYMBOL(sock_common_recvmsg);
2006
2007/*
2008 * Set socket options on an inet socket.
2009 */
2010int sock_common_setsockopt(struct socket *sock, int level, int optname,
2011 char __user *optval, int optlen)
2012{
2013 struct sock *sk = sock->sk;
2014
2015 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2016}
1da177e4
LT		 2017EXPORT_SYMBOL(sock_common_setsockopt);
2018
3fdadf7d 2019#ifdef CONFIG_COMPAT
543d9cfe
ACM		 2020int compat_sock_common_setsockopt(struct socket *sock, int level, int optname,
2021 char __user *optval, int optlen)
3fdadf7d
DM		 2022{
2023 struct sock *sk = sock->sk;
2024
543d9cfe
ACM		 2025 if (sk->sk_prot->compat_setsockopt != NULL)
2026 return sk->sk_prot->compat_setsockopt(sk, level, optname,
2027 optval, optlen);
3fdadf7d
DM		 2028 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
2029}
2030EXPORT_SYMBOL(compat_sock_common_setsockopt);
2031#endif
2032
1da177e4
LT		 2033void sk_common_release(struct sock *sk)
2034{
2035 if (sk->sk_prot->destroy)
2036 sk->sk_prot->destroy(sk);
2037
2038 /*
2039 * Observation: when sock_common_release is called, processes have
2040 * no access to socket. But net still has.
2041 * Step one, detach it from networking:
2042 *
2043 * A. Remove from hash tables.
2044 */
2045
2046 sk->sk_prot->unhash(sk);
2047
2048 /*
2049 * In this point socket cannot receive new packets, but it is possible
2050 * that some packets are in flight because some CPU runs receiver and
2051 * did hash table lookup before we unhashed socket. They will achieve
2052 * receive queue and will be purged by socket destructor.
2053 *
2054 * Also we still have packets pending on receive queue and probably,
2055 * our own packets waiting in device queues. sock_destroy will drain
2056 * receive queue, but transmitted packets will delay socket destruction
2057 * until the last reference will be released.
2058 */
2059
2060 sock_orphan(sk);
2061
2062 xfrm_sk_free_policy(sk);
2063
e6848976 2064 sk_refcnt_debug_release(sk);
1da177e4
LT		 2065 sock_put(sk);
2066}
1da177e4
LT		 2067EXPORT_SYMBOL(sk_common_release);
2068
2069static DEFINE_RWLOCK(proto_list_lock);
2070static LIST_HEAD(proto_list);
2071
13ff3d6f
PE		 2072#ifdef CONFIG_PROC_FS
2073#define PROTO_INUSE_NR 64 /* should be enough for the first time */
1338d466
PE		 2074struct prot_inuse {
2075 int val[PROTO_INUSE_NR];
2076};
13ff3d6f
PE		 2077
2078static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR);
70ee1159
PE		 2079
2080#ifdef CONFIG_NET_NS
2081void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
2082{
2083 int cpu = smp_processor_id();
2084 per_cpu_ptr(net->core.inuse, cpu)->val[prot->inuse_idx] += val;
2085}
2086EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2087
2088int sock_prot_inuse_get(struct net *net, struct proto *prot)
2089{
2090 int cpu, idx = prot->inuse_idx;
2091 int res = 0;
2092
2093 for_each_possible_cpu(cpu)
2094 res += per_cpu_ptr(net->core.inuse, cpu)->val[idx];
2095
2096 return res >= 0 ? res : 0;
2097}
2098EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
2099
2100static int sock_inuse_init_net(struct net *net)
2101{
2102 net->core.inuse = alloc_percpu(struct prot_inuse);
2103 return net->core.inuse ? 0 : -ENOMEM;
2104}
2105
2106static void sock_inuse_exit_net(struct net *net)
2107{
2108 free_percpu(net->core.inuse);
2109}
2110
2111static struct pernet_operations net_inuse_ops = {
2112 .init = sock_inuse_init_net,
2113 .exit = sock_inuse_exit_net,
2114};
2115
2116static __init int net_inuse_init(void)
2117{
2118 if (register_pernet_subsys(&net_inuse_ops))
2119 panic("Cannot initialize net inuse counters");
2120
2121 return 0;
2122}
2123
2124core_initcall(net_inuse_init);
2125#else
1338d466
PE		 2126static DEFINE_PER_CPU(struct prot_inuse, prot_inuse);
2127
c29a0bc4 2128void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
1338d466
PE		 2129{
2130 __get_cpu_var(prot_inuse).val[prot->inuse_idx] += val;
2131}
2132EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
2133
c29a0bc4 2134int sock_prot_inuse_get(struct net *net, struct proto *prot)
1338d466
PE		 2135{
2136 int cpu, idx = prot->inuse_idx;
2137 int res = 0;
2138
2139 for_each_possible_cpu(cpu)
2140 res += per_cpu(prot_inuse, cpu).val[idx];
2141
2142 return res >= 0 ? res : 0;
2143}
2144EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
70ee1159 2145#endif
13ff3d6f
PE		 2146
2147static void assign_proto_idx(struct proto *prot)
2148{
2149 prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR);
2150
2151 if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) {
2152 printk(KERN_ERR "PROTO_INUSE_NR exhausted\n");
2153 return;
2154 }
2155
2156 set_bit(prot->inuse_idx, proto_inuse_idx);
2157}
2158
2159static void release_proto_idx(struct proto *prot)
2160{
2161 if (prot->inuse_idx != PROTO_INUSE_NR - 1)
2162 clear_bit(prot->inuse_idx, proto_inuse_idx);
2163}
2164#else
2165static inline void assign_proto_idx(struct proto *prot)
2166{
2167}
2168
2169static inline void release_proto_idx(struct proto *prot)
2170{
2171}
2172#endif
2173
b733c007
PE		 2174int proto_register(struct proto *prot, int alloc_slab)
2175{
1da177e4
LT		 2176 if (alloc_slab) {
2177 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0,
271b72c7
ED		 2178 SLAB_HWCACHE_ALIGN | prot->slab_flags,
2179 NULL);
1da177e4
LT		 2180
2181 if (prot->slab == NULL) {
2182 printk(KERN_CRIT "%s: Can't create sock SLAB cache!\n",
2183 prot->name);
60e7663d 2184 goto out;
1da177e4 2185 }
2e6599cb
ACM		 2186
2187 if (prot->rsk_prot != NULL) {
2188 static const char mask[] = "request_sock_%s";
2189
7e56b5d6
CM		 2190 prot->rsk_prot->slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL);
2191 if (prot->rsk_prot->slab_name == NULL)
2e6599cb
ACM		 2192 goto out_free_sock_slab;
2193
7e56b5d6
CM		 2194 sprintf(prot->rsk_prot->slab_name, mask, prot->name);
2195 prot->rsk_prot->slab = kmem_cache_create(prot->rsk_prot->slab_name,
2e6599cb 2196 prot->rsk_prot->obj_size, 0,
20c2df83 2197 SLAB_HWCACHE_ALIGN, NULL);
2e6599cb
ACM		 2198
2199 if (prot->rsk_prot->slab == NULL) {
2200 printk(KERN_CRIT "%s: Can't create request sock SLAB cache!\n",
2201 prot->name);
2202 goto out_free_request_sock_slab_name;
2203 }
2204 }
8feaf0c0 2205
6d6ee43e 2206 if (prot->twsk_prot != NULL) {
8feaf0c0
ACM		 2207 static const char mask[] = "tw_sock_%s";
2208
7e56b5d6 2209 prot->twsk_prot->twsk_slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL);
8feaf0c0 2210
7e56b5d6 2211 if (prot->twsk_prot->twsk_slab_name == NULL)
8feaf0c0
ACM		 2212 goto out_free_request_sock_slab;
2213
7e56b5d6 2214 sprintf(prot->twsk_prot->twsk_slab_name, mask, prot->name);
6d6ee43e 2215 prot->twsk_prot->twsk_slab =
7e56b5d6 2216 kmem_cache_create(prot->twsk_prot->twsk_slab_name,
6d6ee43e 2217 prot->twsk_prot->twsk_obj_size,
3ab5aee7
ED		 2218 0,
2219 SLAB_HWCACHE_ALIGN |
2220 prot->slab_flags,
20c2df83 2221 NULL);
6d6ee43e 2222 if (prot->twsk_prot->twsk_slab == NULL)
8feaf0c0
ACM		 2223 goto out_free_timewait_sock_slab_name;
2224 }
1da177e4
LT		 2225 }
2226
2a278051 2227 write_lock(&proto_list_lock);
1da177e4 2228 list_add(&prot->node, &proto_list);
13ff3d6f 2229 assign_proto_idx(prot);
1da177e4 2230 write_unlock(&proto_list_lock);
b733c007
PE		 2231 return 0;
2232
8feaf0c0 2233out_free_timewait_sock_slab_name:
7e56b5d6 2234 kfree(prot->twsk_prot->twsk_slab_name);
8feaf0c0
ACM		 2235out_free_request_sock_slab:
2236 if (prot->rsk_prot && prot->rsk_prot->slab) {
2237 kmem_cache_destroy(prot->rsk_prot->slab);
2238 prot->rsk_prot->slab = NULL;
2239 }
2e6599cb 2240out_free_request_sock_slab_name:
7e56b5d6 2241 kfree(prot->rsk_prot->slab_name);
2e6599cb
ACM		 2242out_free_sock_slab:
2243 kmem_cache_destroy(prot->slab);
2244 prot->slab = NULL;
b733c007
PE		 2245out:
2246 return -ENOBUFS;
1da177e4 2247}
1da177e4
LT		 2248EXPORT_SYMBOL(proto_register);
2249
2250void proto_unregister(struct proto *prot)
2251{
2252 write_lock(&proto_list_lock);
13ff3d6f 2253 release_proto_idx(prot);
0a3f4358
PM		 2254 list_del(&prot->node);
2255 write_unlock(&proto_list_lock);
1da177e4
LT		 2256
2257 if (prot->slab != NULL) {
2258 kmem_cache_destroy(prot->slab);
2259 prot->slab = NULL;
2260 }
2261
2e6599cb 2262 if (prot->rsk_prot != NULL && prot->rsk_prot->slab != NULL) {
2e6599cb 2263 kmem_cache_destroy(prot->rsk_prot->slab);
7e56b5d6 2264 kfree(prot->rsk_prot->slab_name);
2e6599cb
ACM		 2265 prot->rsk_prot->slab = NULL;
2266 }
2267
6d6ee43e 2268 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) {
6d6ee43e 2269 kmem_cache_destroy(prot->twsk_prot->twsk_slab);
7e56b5d6 2270 kfree(prot->twsk_prot->twsk_slab_name);
6d6ee43e 2271 prot->twsk_prot->twsk_slab = NULL;
8feaf0c0 2272 }
1da177e4 2273}
1da177e4
LT		 2274EXPORT_SYMBOL(proto_unregister);
2275
2276#ifdef CONFIG_PROC_FS
1da177e4 2277static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
9a429c49 2278 __acquires(proto_list_lock)
1da177e4
LT		 2279{
2280 read_lock(&proto_list_lock);
60f0438a 2281 return seq_list_start_head(&proto_list, *pos);
1da177e4
LT		 2282}
2283
2284static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2285{
60f0438a 2286 return seq_list_next(v, &proto_list, pos);
1da177e4
LT		 2287}
2288
2289static void proto_seq_stop(struct seq_file *seq, void *v)
9a429c49 2290 __releases(proto_list_lock)
1da177e4
LT		 2291{
2292 read_unlock(&proto_list_lock);
2293}
2294
2295static char proto_method_implemented(const void *method)
2296{
2297 return method == NULL ? 'n' : 'y';
2298}
2299
2300static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
2301{
2302 seq_printf(seq, "%-9s %4u %6d %6d %-3s %6u %-3s %-10s "
2303 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
2304 proto->name,
2305 proto->obj_size,
14e943db 2306 sock_prot_inuse_get(seq_file_net(seq), proto),
1da177e4
LT		 2307 proto->memory_allocated != NULL ? atomic_read(proto->memory_allocated) : -1,
2308 proto->memory_pressure != NULL ? *proto->memory_pressure ? "yes" : "no" : "NI",
2309 proto->max_header,
2310 proto->slab == NULL ? "no" : "yes",
2311 module_name(proto->owner),
2312 proto_method_implemented(proto->close),
2313 proto_method_implemented(proto->connect),
2314 proto_method_implemented(proto->disconnect),
2315 proto_method_implemented(proto->accept),
2316 proto_method_implemented(proto->ioctl),
2317 proto_method_implemented(proto->init),
2318 proto_method_implemented(proto->destroy),
2319 proto_method_implemented(proto->shutdown),
2320 proto_method_implemented(proto->setsockopt),
2321 proto_method_implemented(proto->getsockopt),
2322 proto_method_implemented(proto->sendmsg),
2323 proto_method_implemented(proto->recvmsg),
2324 proto_method_implemented(proto->sendpage),
2325 proto_method_implemented(proto->bind),
2326 proto_method_implemented(proto->backlog_rcv),
2327 proto_method_implemented(proto->hash),
2328 proto_method_implemented(proto->unhash),
2329 proto_method_implemented(proto->get_port),
2330 proto_method_implemented(proto->enter_memory_pressure));
2331}
2332
2333static int proto_seq_show(struct seq_file *seq, void *v)
2334{
60f0438a 2335 if (v == &proto_list)
1da177e4
LT		 2336 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
2337 "protocol",
2338 "size",
2339 "sockets",
2340 "memory",
2341 "press",
2342 "maxhdr",
2343 "slab",
2344 "module",
2345 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
2346 else
60f0438a 2347 proto_seq_printf(seq, list_entry(v, struct proto, node));
1da177e4
LT		 2348 return 0;
2349}
2350
f690808e 2351static const struct seq_operations proto_seq_ops = {
1da177e4
LT		 2352 .start = proto_seq_start,
2353 .next = proto_seq_next,
2354 .stop = proto_seq_stop,
2355 .show = proto_seq_show,
2356};
2357
2358static int proto_seq_open(struct inode *inode, struct file *file)
2359{
14e943db
ED		 2360 return seq_open_net(inode, file, &proto_seq_ops,
2361 sizeof(struct seq_net_private));
1da177e4
LT		 2362}
2363
9a32144e 2364static const struct file_operations proto_seq_fops = {
1da177e4
LT		 2365 .owner = THIS_MODULE,
2366 .open = proto_seq_open,
2367 .read = seq_read,
2368 .llseek = seq_lseek,
14e943db
ED		 2369 .release = seq_release_net,
2370};
2371
2372static __net_init int proto_init_net(struct net *net)
2373{
2374 if (!proc_net_fops_create(net, "protocols", S_IRUGO, &proto_seq_fops))
2375 return -ENOMEM;
2376
2377 return 0;
2378}
2379
2380static __net_exit void proto_exit_net(struct net *net)
2381{
2382 proc_net_remove(net, "protocols");
2383}
2384
2385
2386static __net_initdata struct pernet_operations proto_net_ops = {
2387 .init = proto_init_net,
2388 .exit = proto_exit_net,
1da177e4
LT		 2389};
2390
2391static int __init proto_init(void)
2392{
14e943db 2393 return register_pernet_subsys(&proto_net_ops);
1da177e4
LT		 2394}
2395
2396subsys_initcall(proto_init);
2397
2398#endif /* PROC_FS */
Clone of davem's net-next-2.6 tree