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[LIB] pcounter : unline too big functions
[GitHub/moto-9609/android_kernel_motorola_exynos9610.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 *
10 * Version: $Id: sock.c,v 1.117 2002/02/01 22:01:03 davem Exp $
11 *
02c30a84 12 * Authors: Ross Biro
1da177e4
LT		 13 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
14 * Florian La Roche, <flla@stud.uni-sb.de>
15 * Alan Cox, <A.Cox@swansea.ac.uk>
16 *
17 * Fixes:
18 * Alan Cox : Numerous verify_area() problems
19 * Alan Cox : Connecting on a connecting socket
20 * now returns an error for tcp.
21 * Alan Cox : sock->protocol is set correctly.
22 * and is not sometimes left as 0.
23 * Alan Cox : connect handles icmp errors on a
24 * connect properly. Unfortunately there
25 * is a restart syscall nasty there. I
26 * can't match BSD without hacking the C
27 * library. Ideas urgently sought!
28 * Alan Cox : Disallow bind() to addresses that are
29 * not ours - especially broadcast ones!!
30 * Alan Cox : Socket 1024 _IS_ ok for users. (fencepost)
31 * Alan Cox : sock_wfree/sock_rfree don't destroy sockets,
32 * instead they leave that for the DESTROY timer.
33 * Alan Cox : Clean up error flag in accept
34 * Alan Cox : TCP ack handling is buggy, the DESTROY timer
35 * was buggy. Put a remove_sock() in the handler
36 * for memory when we hit 0. Also altered the timer
4ec93edb 37 * code. The ACK stuff can wait and needs major
1da177e4
LT		 38 * TCP layer surgery.
39 * Alan Cox : Fixed TCP ack bug, removed remove sock
40 * and fixed timer/inet_bh race.
41 * Alan Cox : Added zapped flag for TCP
42 * Alan Cox : Move kfree_skb into skbuff.c and tidied up surplus code
43 * Alan Cox : for new sk_buff allocations wmalloc/rmalloc now call alloc_skb
44 * Alan Cox : kfree_s calls now are kfree_skbmem so we can track skb resources
45 * Alan Cox : Supports socket option broadcast now as does udp. Packet and raw need fixing.
46 * Alan Cox : Added RCVBUF,SNDBUF size setting. It suddenly occurred to me how easy it was so...
47 * Rick Sladkey : Relaxed UDP rules for matching packets.
48 * C.E.Hawkins : IFF_PROMISC/SIOCGHWADDR support
49 * Pauline Middelink : identd support
50 * Alan Cox : Fixed connect() taking signals I think.
51 * Alan Cox : SO_LINGER supported
52 * Alan Cox : Error reporting fixes
53 * Anonymous : inet_create tidied up (sk->reuse setting)
54 * Alan Cox : inet sockets don't set sk->type!
55 * Alan Cox : Split socket option code
56 * Alan Cox : Callbacks
57 * Alan Cox : Nagle flag for Charles & Johannes stuff
58 * Alex : Removed restriction on inet fioctl
59 * Alan Cox : Splitting INET from NET core
60 * Alan Cox : Fixed bogus SO_TYPE handling in getsockopt()
61 * Adam Caldwell : Missing return in SO_DONTROUTE/SO_DEBUG code
62 * Alan Cox : Split IP from generic code
63 * Alan Cox : New kfree_skbmem()
64 * Alan Cox : Make SO_DEBUG superuser only.
65 * Alan Cox : Allow anyone to clear SO_DEBUG
66 * (compatibility fix)
67 * Alan Cox : Added optimistic memory grabbing for AF_UNIX throughput.
68 * Alan Cox : Allocator for a socket is settable.
69 * Alan Cox : SO_ERROR includes soft errors.
70 * Alan Cox : Allow NULL arguments on some SO_ opts
71 * Alan Cox : Generic socket allocation to make hooks
72 * easier (suggested by Craig Metz).
73 * Michael Pall : SO_ERROR returns positive errno again
74 * Steve Whitehouse: Added default destructor to free
75 * protocol private data.
76 * Steve Whitehouse: Added various other default routines
77 * common to several socket families.
78 * Chris Evans : Call suser() check last on F_SETOWN
79 * Jay Schulist : Added SO_ATTACH_FILTER and SO_DETACH_FILTER.
80 * Andi Kleen : Add sock_kmalloc()/sock_kfree_s()
81 * Andi Kleen : Fix write_space callback
82 * Chris Evans : Security fixes - signedness again
83 * Arnaldo C. Melo : cleanups, use skb_queue_purge
84 *
85 * To Fix:
86 *
87 *
88 * This program is free software; you can redistribute it and/or
89 * modify it under the terms of the GNU General Public License
90 * as published by the Free Software Foundation; either version
91 * 2 of the License, or (at your option) any later version.
92 */
93
4fc268d2 94#include <linux/capability.h>
1da177e4
LT		 95#include <linux/errno.h>
96#include <linux/types.h>
97#include <linux/socket.h>
98#include <linux/in.h>
99#include <linux/kernel.h>
1da177e4
LT		 100#include <linux/module.h>
101#include <linux/proc_fs.h>
102#include <linux/seq_file.h>
103#include <linux/sched.h>
104#include <linux/timer.h>
105#include <linux/string.h>
106#include <linux/sockios.h>
107#include <linux/net.h>
108#include <linux/mm.h>
109#include <linux/slab.h>
110#include <linux/interrupt.h>
111#include <linux/poll.h>
112#include <linux/tcp.h>
113#include <linux/init.h>
a1f8e7f7 114#include <linux/highmem.h>
1da177e4
LT		 115
116#include <asm/uaccess.h>
117#include <asm/system.h>
118
119#include <linux/netdevice.h>
120#include <net/protocol.h>
121#include <linux/skbuff.h>
457c4cbc 122#include <net/net_namespace.h>
2e6599cb 123#include <net/request_sock.h>
1da177e4
LT		 124#include <net/sock.h>
125#include <net/xfrm.h>
126#include <linux/ipsec.h>
127
128#include <linux/filter.h>
129
130#ifdef CONFIG_INET
131#include <net/tcp.h>
132#endif
133
da21f24d
IM		 134/*
135 * Each address family might have different locking rules, so we have
136 * one slock key per address family:
137 */
a5b5bb9a
IM		 138static struct lock_class_key af_family_keys[AF_MAX];
139static struct lock_class_key af_family_slock_keys[AF_MAX];
140
141#ifdef CONFIG_DEBUG_LOCK_ALLOC
142/*
143 * Make lock validator output more readable. (we pre-construct these
144 * strings build-time, so that runtime initialization of socket
145 * locks is fast):
146 */
147static const char *af_family_key_strings[AF_MAX+1] = {
148 "sk_lock-AF_UNSPEC", "sk_lock-AF_UNIX" , "sk_lock-AF_INET" ,
149 "sk_lock-AF_AX25" , "sk_lock-AF_IPX" , "sk_lock-AF_APPLETALK",
150 "sk_lock-AF_NETROM", "sk_lock-AF_BRIDGE" , "sk_lock-AF_ATMPVC" ,
151 "sk_lock-AF_X25" , "sk_lock-AF_INET6" , "sk_lock-AF_ROSE" ,
152 "sk_lock-AF_DECnet", "sk_lock-AF_NETBEUI" , "sk_lock-AF_SECURITY" ,
153 "sk_lock-AF_KEY" , "sk_lock-AF_NETLINK" , "sk_lock-AF_PACKET" ,
154 "sk_lock-AF_ASH" , "sk_lock-AF_ECONET" , "sk_lock-AF_ATMSVC" ,
155 "sk_lock-21" , "sk_lock-AF_SNA" , "sk_lock-AF_IRDA" ,
156 "sk_lock-AF_PPPOX" , "sk_lock-AF_WANPIPE" , "sk_lock-AF_LLC" ,
cd05acfe 157 "sk_lock-27" , "sk_lock-28" , "sk_lock-AF_CAN" ,
17926a79
DH		 158 "sk_lock-AF_TIPC" , "sk_lock-AF_BLUETOOTH", "sk_lock-IUCV" ,
159 "sk_lock-AF_RXRPC" , "sk_lock-AF_MAX"
a5b5bb9a
IM		 160};
161static const char *af_family_slock_key_strings[AF_MAX+1] = {
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" ,
169 "slock-21" , "slock-AF_SNA" , "slock-AF_IRDA" ,
170 "slock-AF_PPPOX" , "slock-AF_WANPIPE" , "slock-AF_LLC" ,
cd05acfe 171 "slock-27" , "slock-28" , "slock-AF_CAN" ,
17926a79
DH		 172 "slock-AF_TIPC" , "slock-AF_BLUETOOTH", "slock-AF_IUCV" ,
173 "slock-AF_RXRPC" , "slock-AF_MAX"
a5b5bb9a 174};
443aef0e
PZ		 175static const char *af_family_clock_key_strings[AF_MAX+1] = {
176 "clock-AF_UNSPEC", "clock-AF_UNIX" , "clock-AF_INET" ,
177 "clock-AF_AX25" , "clock-AF_IPX" , "clock-AF_APPLETALK",
178 "clock-AF_NETROM", "clock-AF_BRIDGE" , "clock-AF_ATMPVC" ,
179 "clock-AF_X25" , "clock-AF_INET6" , "clock-AF_ROSE" ,
180 "clock-AF_DECnet", "clock-AF_NETBEUI" , "clock-AF_SECURITY" ,
181 "clock-AF_KEY" , "clock-AF_NETLINK" , "clock-AF_PACKET" ,
182 "clock-AF_ASH" , "clock-AF_ECONET" , "clock-AF_ATMSVC" ,
183 "clock-21" , "clock-AF_SNA" , "clock-AF_IRDA" ,
184 "clock-AF_PPPOX" , "clock-AF_WANPIPE" , "clock-AF_LLC" ,
185 "clock-27" , "clock-28" , "clock-29" ,
e51f802b
DH		 186 "clock-AF_TIPC" , "clock-AF_BLUETOOTH", "clock-AF_IUCV" ,
187 "clock-AF_RXRPC" , "clock-AF_MAX"
443aef0e 188};
a5b5bb9a 189#endif
da21f24d
IM		 190
191/*
192 * sk_callback_lock locking rules are per-address-family,
193 * so split the lock classes by using a per-AF key:
194 */
195static struct lock_class_key af_callback_keys[AF_MAX];
196
1da177e4
LT		 197/* Take into consideration the size of the struct sk_buff overhead in the
198 * determination of these values, since that is non-constant across
199 * platforms. This makes socket queueing behavior and performance
200 * not depend upon such differences.
201 */
202#define _SK_MEM_PACKETS 256
203#define _SK_MEM_OVERHEAD (sizeof(struct sk_buff) + 256)
204#define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
205#define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
206
207/* Run time adjustable parameters. */
ab32ea5d
BH		 208__u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX;
209__u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX;
210__u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX;
211__u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX;
1da177e4
LT		 212
213/* Maximal space eaten by iovec or ancilliary data plus some space */
ab32ea5d 214int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512);
1da177e4
LT		 215
216static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen)
217{
218 struct timeval tv;
219
220 if (optlen < sizeof(tv))
221 return -EINVAL;
222 if (copy_from_user(&tv, optval, sizeof(tv)))
223 return -EFAULT;
ba78073e
VA		 224 if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC)
225 return -EDOM;
1da177e4 226
ba78073e 227 if (tv.tv_sec < 0) {
6f11df83
AM		 228 static int warned __read_mostly;
229
ba78073e
VA		 230 *timeo_p = 0;
231 if (warned < 10 && net_ratelimit())
232 warned++;
233 printk(KERN_INFO "sock_set_timeout: `%s' (pid %d) "
234 "tries to set negative timeout\n",
ba25f9dc 235 current->comm, task_pid_nr(current));
ba78073e
VA		 236 return 0;
237 }
1da177e4
LT		 238 *timeo_p = MAX_SCHEDULE_TIMEOUT;
239 if (tv.tv_sec == 0 && tv.tv_usec == 0)
240 return 0;
241 if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1))
242 *timeo_p = tv.tv_sec*HZ + (tv.tv_usec+(1000000/HZ-1))/(1000000/HZ);
243 return 0;
244}
245
246static void sock_warn_obsolete_bsdism(const char *name)
247{
248 static int warned;
249 static char warncomm[TASK_COMM_LEN];
4ec93edb
YH		 250 if (strcmp(warncomm, current->comm) && warned < 5) {
251 strcpy(warncomm, current->comm);
1da177e4
LT		 252 printk(KERN_WARNING "process `%s' is using obsolete "
253 "%s SO_BSDCOMPAT\n", warncomm, name);
254 warned++;
255 }
256}
257
258static void sock_disable_timestamp(struct sock *sk)
4ec93edb
YH		 259{
260 if (sock_flag(sk, SOCK_TIMESTAMP)) {
1da177e4
LT		 261 sock_reset_flag(sk, SOCK_TIMESTAMP);
262 net_disable_timestamp();
263 }
264}
265
266
f0088a50
DV		 267int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
268{
269 int err = 0;
270 int skb_len;
271
272 /* Cast skb->rcvbuf to unsigned... It's pointless, but reduces
273 number of warnings when compiling with -W --ANK
274 */
275 if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >=
276 (unsigned)sk->sk_rcvbuf) {
277 err = -ENOMEM;
278 goto out;
279 }
280
fda9ef5d 281 err = sk_filter(sk, skb);
f0088a50
DV		 282 if (err)
283 goto out;
284
3ab224be
HA		 285 if (!sk_rmem_schedule(sk, skb->truesize)) {
286 err = -ENOBUFS;
287 goto out;
288 }
289
f0088a50
DV		 290 skb->dev = NULL;
291 skb_set_owner_r(skb, sk);
292
293 /* Cache the SKB length before we tack it onto the receive
294 * queue. Once it is added it no longer belongs to us and
295 * may be freed by other threads of control pulling packets
296 * from the queue.
297 */
298 skb_len = skb->len;
299
300 skb_queue_tail(&sk->sk_receive_queue, skb);
301
302 if (!sock_flag(sk, SOCK_DEAD))
303 sk->sk_data_ready(sk, skb_len);
304out:
305 return err;
306}
307EXPORT_SYMBOL(sock_queue_rcv_skb);
308
58a5a7b9 309int sk_receive_skb(struct sock *sk, struct sk_buff *skb, const int nested)
f0088a50
DV		 310{
311 int rc = NET_RX_SUCCESS;
312
fda9ef5d 313 if (sk_filter(sk, skb))
f0088a50
DV		 314 goto discard_and_relse;
315
316 skb->dev = NULL;
317
58a5a7b9
ACM		 318 if (nested)
319 bh_lock_sock_nested(sk);
320 else
321 bh_lock_sock(sk);
a5b5bb9a
IM		 322 if (!sock_owned_by_user(sk)) {
323 /*
324 * trylock + unlock semantics:
325 */
326 mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_);
327
f0088a50 328 rc = sk->sk_backlog_rcv(sk, skb);
a5b5bb9a
IM		 329
330 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
331 } else
f0088a50
DV		 332 sk_add_backlog(sk, skb);
333 bh_unlock_sock(sk);
334out:
335 sock_put(sk);
336 return rc;
337discard_and_relse:
338 kfree_skb(skb);
339 goto out;
340}
341EXPORT_SYMBOL(sk_receive_skb);
342
343struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie)
344{
345 struct dst_entry *dst = sk->sk_dst_cache;
346
347 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
348 sk->sk_dst_cache = NULL;
349 dst_release(dst);
350 return NULL;
351 }
352
353 return dst;
354}
355EXPORT_SYMBOL(__sk_dst_check);
356
357struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie)
358{
359 struct dst_entry *dst = sk_dst_get(sk);
360
361 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
362 sk_dst_reset(sk);
363 dst_release(dst);
364 return NULL;
365 }
366
367 return dst;
368}
369EXPORT_SYMBOL(sk_dst_check);
370
4878809f
DM		 371static int sock_bindtodevice(struct sock *sk, char __user *optval, int optlen)
372{
373 int ret = -ENOPROTOOPT;
374#ifdef CONFIG_NETDEVICES
881d966b 375 struct net *net = sk->sk_net;
4878809f
DM		 376 char devname[IFNAMSIZ];
377 int index;
378
379 /* Sorry... */
380 ret = -EPERM;
381 if (!capable(CAP_NET_RAW))
382 goto out;
383
384 ret = -EINVAL;
385 if (optlen < 0)
386 goto out;
387
388 /* Bind this socket to a particular device like "eth0",
389 * as specified in the passed interface name. If the
390 * name is "" or the option length is zero the socket
391 * is not bound.
392 */
393 if (optlen > IFNAMSIZ - 1)
394 optlen = IFNAMSIZ - 1;
395 memset(devname, 0, sizeof(devname));
396
397 ret = -EFAULT;
398 if (copy_from_user(devname, optval, optlen))
399 goto out;
400
401 if (devname[0] == '\0') {
402 index = 0;
403 } else {
881d966b 404 struct net_device *dev = dev_get_by_name(net, devname);
4878809f
DM		 405
406 ret = -ENODEV;
407 if (!dev)
408 goto out;
409
410 index = dev->ifindex;
411 dev_put(dev);
412 }
413
414 lock_sock(sk);
415 sk->sk_bound_dev_if = index;
416 sk_dst_reset(sk);
417 release_sock(sk);
418
419 ret = 0;
420
421out:
422#endif
423
424 return ret;
425}
426
c0ef877b
PE		 427static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool)
428{
429 if (valbool)
430 sock_set_flag(sk, bit);
431 else
432 sock_reset_flag(sk, bit);
433}
434
1da177e4
LT		 435/*
436 * This is meant for all protocols to use and covers goings on
437 * at the socket level. Everything here is generic.
438 */
439
440int sock_setsockopt(struct socket *sock, int level, int optname,
441 char __user *optval, int optlen)
442{
443 struct sock *sk=sock->sk;
1da177e4
LT		 444 int val;
445 int valbool;
446 struct linger ling;
447 int ret = 0;
4ec93edb 448
1da177e4
LT		 449 /*
450 * Options without arguments
451 */
452
453#ifdef SO_DONTLINGER /* Compatibility item... */
a77be819
KM		 454 if (optname == SO_DONTLINGER) {
455 lock_sock(sk);
456 sock_reset_flag(sk, SOCK_LINGER);
457 release_sock(sk);
458 return 0;
1da177e4 459 }
a77be819 460#endif
4ec93edb 461
4878809f
DM		 462 if (optname == SO_BINDTODEVICE)
463 return sock_bindtodevice(sk, optval, optlen);
464
e71a4783
SH		 465 if (optlen < sizeof(int))
466 return -EINVAL;
4ec93edb 467
1da177e4
LT		 468 if (get_user(val, (int __user *)optval))
469 return -EFAULT;
4ec93edb
YH		 470
471 valbool = val?1:0;
1da177e4
LT		 472
473 lock_sock(sk);
474
e71a4783
SH		 475 switch(optname) {
476 case SO_DEBUG:
477 if (val && !capable(CAP_NET_ADMIN)) {
478 ret = -EACCES;
c0ef877b
PE		 479 } else
480 sock_valbool_flag(sk, SOCK_DBG, valbool);
e71a4783
SH		 481 break;
482 case SO_REUSEADDR:
483 sk->sk_reuse = valbool;
484 break;
485 case SO_TYPE:
486 case SO_ERROR:
487 ret = -ENOPROTOOPT;
488 break;
489 case SO_DONTROUTE:
c0ef877b 490 sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool);
e71a4783
SH		 491 break;
492 case SO_BROADCAST:
493 sock_valbool_flag(sk, SOCK_BROADCAST, valbool);
494 break;
495 case SO_SNDBUF:
496 /* Don't error on this BSD doesn't and if you think
497 about it this is right. Otherwise apps have to
498 play 'guess the biggest size' games. RCVBUF/SNDBUF
499 are treated in BSD as hints */
500
501 if (val > sysctl_wmem_max)
502 val = sysctl_wmem_max;
b0573dea 503set_sndbuf:
e71a4783
SH		 504 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
505 if ((val * 2) < SOCK_MIN_SNDBUF)
506 sk->sk_sndbuf = SOCK_MIN_SNDBUF;
507 else
508 sk->sk_sndbuf = val * 2;
1da177e4 509
e71a4783
SH		 510 /*
511 * Wake up sending tasks if we
512 * upped the value.
513 */
514 sk->sk_write_space(sk);
515 break;
1da177e4 516
e71a4783
SH		 517 case SO_SNDBUFFORCE:
518 if (!capable(CAP_NET_ADMIN)) {
519 ret = -EPERM;
520 break;
521 }
522 goto set_sndbuf;
b0573dea 523
e71a4783
SH		 524 case SO_RCVBUF:
525 /* Don't error on this BSD doesn't and if you think
526 about it this is right. Otherwise apps have to
527 play 'guess the biggest size' games. RCVBUF/SNDBUF
528 are treated in BSD as hints */
4ec93edb 529
e71a4783
SH		 530 if (val > sysctl_rmem_max)
531 val = sysctl_rmem_max;
b0573dea 532set_rcvbuf:
e71a4783
SH		 533 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
534 /*
535 * We double it on the way in to account for
536 * "struct sk_buff" etc. overhead. Applications
537 * assume that the SO_RCVBUF setting they make will
538 * allow that much actual data to be received on that
539 * socket.
540 *
541 * Applications are unaware that "struct sk_buff" and
542 * other overheads allocate from the receive buffer
543 * during socket buffer allocation.
544 *
545 * And after considering the possible alternatives,
546 * returning the value we actually used in getsockopt
547 * is the most desirable behavior.
548 */
549 if ((val * 2) < SOCK_MIN_RCVBUF)
550 sk->sk_rcvbuf = SOCK_MIN_RCVBUF;
551 else
552 sk->sk_rcvbuf = val * 2;
553 break;
554
555 case SO_RCVBUFFORCE:
556 if (!capable(CAP_NET_ADMIN)) {
557 ret = -EPERM;
1da177e4 558 break;
e71a4783
SH		 559 }
560 goto set_rcvbuf;
1da177e4 561
e71a4783 562 case SO_KEEPALIVE:
1da177e4 563#ifdef CONFIG_INET
e71a4783
SH		 564 if (sk->sk_protocol == IPPROTO_TCP)
565 tcp_set_keepalive(sk, valbool);
1da177e4 566#endif
e71a4783
SH		 567 sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool);
568 break;
569
570 case SO_OOBINLINE:
571 sock_valbool_flag(sk, SOCK_URGINLINE, valbool);
572 break;
573
574 case SO_NO_CHECK:
575 sk->sk_no_check = valbool;
576 break;
577
578 case SO_PRIORITY:
579 if ((val >= 0 && val <= 6) || capable(CAP_NET_ADMIN))
580 sk->sk_priority = val;
581 else
582 ret = -EPERM;
583 break;
584
585 case SO_LINGER:
586 if (optlen < sizeof(ling)) {
587 ret = -EINVAL; /* 1003.1g */
1da177e4 588 break;
e71a4783
SH		 589 }
590 if (copy_from_user(&ling,optval,sizeof(ling))) {
591 ret = -EFAULT;
1da177e4 592 break;
e71a4783
SH		 593 }
594 if (!ling.l_onoff)
595 sock_reset_flag(sk, SOCK_LINGER);
596 else {
1da177e4 597#if (BITS_PER_LONG == 32)
e71a4783
SH		 598 if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ)
599 sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT;
1da177e4 600 else
e71a4783
SH		 601#endif
602 sk->sk_lingertime = (unsigned int)ling.l_linger * HZ;
603 sock_set_flag(sk, SOCK_LINGER);
604 }
605 break;
606
607 case SO_BSDCOMPAT:
608 sock_warn_obsolete_bsdism("setsockopt");
609 break;
610
611 case SO_PASSCRED:
612 if (valbool)
613 set_bit(SOCK_PASSCRED, &sock->flags);
614 else
615 clear_bit(SOCK_PASSCRED, &sock->flags);
616 break;
617
618 case SO_TIMESTAMP:
92f37fd2 619 case SO_TIMESTAMPNS:
e71a4783 620 if (valbool) {
92f37fd2
ED		 621 if (optname == SO_TIMESTAMP)
622 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
623 else
624 sock_set_flag(sk, SOCK_RCVTSTAMPNS);
e71a4783
SH		 625 sock_set_flag(sk, SOCK_RCVTSTAMP);
626 sock_enable_timestamp(sk);
92f37fd2 627 } else {
e71a4783 628 sock_reset_flag(sk, SOCK_RCVTSTAMP);
92f37fd2
ED		 629 sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
630 }
e71a4783
SH		 631 break;
632
633 case SO_RCVLOWAT:
634 if (val < 0)
635 val = INT_MAX;
636 sk->sk_rcvlowat = val ? : 1;
637 break;
638
639 case SO_RCVTIMEO:
640 ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen);
641 break;
642
643 case SO_SNDTIMEO:
644 ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen);
645 break;
1da177e4 646
e71a4783
SH		 647 case SO_ATTACH_FILTER:
648 ret = -EINVAL;
649 if (optlen == sizeof(struct sock_fprog)) {
650 struct sock_fprog fprog;
1da177e4 651
e71a4783
SH		 652 ret = -EFAULT;
653 if (copy_from_user(&fprog, optval, sizeof(fprog)))
1da177e4 654 break;
e71a4783
SH		 655
656 ret = sk_attach_filter(&fprog, sk);
657 }
658 break;
659
660 case SO_DETACH_FILTER:
55b33325 661 ret = sk_detach_filter(sk);
e71a4783 662 break;
1da177e4 663
e71a4783
SH		 664 case SO_PASSSEC:
665 if (valbool)
666 set_bit(SOCK_PASSSEC, &sock->flags);
667 else
668 clear_bit(SOCK_PASSSEC, &sock->flags);
669 break;
877ce7c1 670
1da177e4
LT		 671 /* We implement the SO_SNDLOWAT etc to
672 not be settable (1003.1g 5.3) */
e71a4783
SH		 673 default:
674 ret = -ENOPROTOOPT;
675 break;
4ec93edb 676 }
1da177e4
LT		 677 release_sock(sk);
678 return ret;
679}
680
681
682int sock_getsockopt(struct socket *sock, int level, int optname,
683 char __user *optval, int __user *optlen)
684{
685 struct sock *sk = sock->sk;
4ec93edb 686
e71a4783 687 union {
4ec93edb
YH		 688 int val;
689 struct linger ling;
1da177e4
LT		 690 struct timeval tm;
691 } v;
4ec93edb 692
1da177e4
LT		 693 unsigned int lv = sizeof(int);
694 int len;
4ec93edb 695
e71a4783 696 if (get_user(len, optlen))
4ec93edb 697 return -EFAULT;
e71a4783 698 if (len < 0)
1da177e4 699 return -EINVAL;
4ec93edb 700
e71a4783
SH		 701 switch(optname) {
702 case SO_DEBUG:
703 v.val = sock_flag(sk, SOCK_DBG);
704 break;
705
706 case SO_DONTROUTE:
707 v.val = sock_flag(sk, SOCK_LOCALROUTE);
708 break;
709
710 case SO_BROADCAST:
711 v.val = !!sock_flag(sk, SOCK_BROADCAST);
712 break;
713
714 case SO_SNDBUF:
715 v.val = sk->sk_sndbuf;
716 break;
717
718 case SO_RCVBUF:
719 v.val = sk->sk_rcvbuf;
720 break;
721
722 case SO_REUSEADDR:
723 v.val = sk->sk_reuse;
724 break;
725
726 case SO_KEEPALIVE:
727 v.val = !!sock_flag(sk, SOCK_KEEPOPEN);
728 break;
729
730 case SO_TYPE:
731 v.val = sk->sk_type;
732 break;
733
734 case SO_ERROR:
735 v.val = -sock_error(sk);
736 if (v.val==0)
737 v.val = xchg(&sk->sk_err_soft, 0);
738 break;
739
740 case SO_OOBINLINE:
741 v.val = !!sock_flag(sk, SOCK_URGINLINE);
742 break;
743
744 case SO_NO_CHECK:
745 v.val = sk->sk_no_check;
746 break;
747
748 case SO_PRIORITY:
749 v.val = sk->sk_priority;
750 break;
751
752 case SO_LINGER:
753 lv = sizeof(v.ling);
754 v.ling.l_onoff = !!sock_flag(sk, SOCK_LINGER);
755 v.ling.l_linger = sk->sk_lingertime / HZ;
756 break;
757
758 case SO_BSDCOMPAT:
759 sock_warn_obsolete_bsdism("getsockopt");
760 break;
761
762 case SO_TIMESTAMP:
92f37fd2
ED		 763 v.val = sock_flag(sk, SOCK_RCVTSTAMP) &&
764 !sock_flag(sk, SOCK_RCVTSTAMPNS);
765 break;
766
767 case SO_TIMESTAMPNS:
768 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS);
e71a4783
SH		 769 break;
770
771 case SO_RCVTIMEO:
772 lv=sizeof(struct timeval);
773 if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) {
774 v.tm.tv_sec = 0;
775 v.tm.tv_usec = 0;
776 } else {
777 v.tm.tv_sec = sk->sk_rcvtimeo / HZ;
778 v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ;
779 }
780 break;
781
782 case SO_SNDTIMEO:
783 lv=sizeof(struct timeval);
784 if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) {
785 v.tm.tv_sec = 0;
786 v.tm.tv_usec = 0;
787 } else {
788 v.tm.tv_sec = sk->sk_sndtimeo / HZ;
789 v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ;
790 }
791 break;
1da177e4 792
e71a4783
SH		 793 case SO_RCVLOWAT:
794 v.val = sk->sk_rcvlowat;
795 break;
1da177e4 796
e71a4783
SH		 797 case SO_SNDLOWAT:
798 v.val=1;
799 break;
1da177e4 800
e71a4783
SH		 801 case SO_PASSCRED:
802 v.val = test_bit(SOCK_PASSCRED, &sock->flags) ? 1 : 0;
803 break;
1da177e4 804
e71a4783
SH		 805 case SO_PEERCRED:
806 if (len > sizeof(sk->sk_peercred))
807 len = sizeof(sk->sk_peercred);
808 if (copy_to_user(optval, &sk->sk_peercred, len))
809 return -EFAULT;
810 goto lenout;
1da177e4 811
e71a4783
SH		 812 case SO_PEERNAME:
813 {
814 char address[128];
815
816 if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2))
817 return -ENOTCONN;
818 if (lv < len)
819 return -EINVAL;
820 if (copy_to_user(optval, address, len))
821 return -EFAULT;
822 goto lenout;
823 }
1da177e4 824
e71a4783
SH		 825 /* Dubious BSD thing... Probably nobody even uses it, but
826 * the UNIX standard wants it for whatever reason... -DaveM
827 */
828 case SO_ACCEPTCONN:
829 v.val = sk->sk_state == TCP_LISTEN;
830 break;
1da177e4 831
e71a4783
SH		 832 case SO_PASSSEC:
833 v.val = test_bit(SOCK_PASSSEC, &sock->flags) ? 1 : 0;
834 break;
877ce7c1 835
e71a4783
SH		 836 case SO_PEERSEC:
837 return security_socket_getpeersec_stream(sock, optval, optlen, len);
1da177e4 838
e71a4783
SH		 839 default:
840 return -ENOPROTOOPT;
1da177e4 841 }
e71a4783 842
1da177e4
LT		 843 if (len > lv)
844 len = lv;
845 if (copy_to_user(optval, &v, len))
846 return -EFAULT;
847lenout:
4ec93edb
YH		 848 if (put_user(len, optlen))
849 return -EFAULT;
850 return 0;
1da177e4
LT		 851}
852
a5b5bb9a
IM		 853/*
854 * Initialize an sk_lock.
855 *
856 * (We also register the sk_lock with the lock validator.)
857 */
b6f99a21 858static inline void sock_lock_init(struct sock *sk)
a5b5bb9a 859{
ed07536e
PZ		 860 sock_lock_init_class_and_name(sk,
861 af_family_slock_key_strings[sk->sk_family],
862 af_family_slock_keys + sk->sk_family,
863 af_family_key_strings[sk->sk_family],
864 af_family_keys + sk->sk_family);
a5b5bb9a
IM		 865}
866
f1a6c4da
PE		 867static void sock_copy(struct sock *nsk, const struct sock *osk)
868{
869#ifdef CONFIG_SECURITY_NETWORK
870 void *sptr = nsk->sk_security;
871#endif
872
873 memcpy(nsk, osk, osk->sk_prot->obj_size);
f1a6c4da
PE		 874#ifdef CONFIG_SECURITY_NETWORK
875 nsk->sk_security = sptr;
876 security_sk_clone(osk, nsk);
877#endif
878}
879
2e4afe7b
PE		 880static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority,
881 int family)
c308c1b2
PE		 882{
883 struct sock *sk;
884 struct kmem_cache *slab;
885
886 slab = prot->slab;
887 if (slab != NULL)
888 sk = kmem_cache_alloc(slab, priority);
889 else
890 sk = kmalloc(prot->obj_size, priority);
891
2e4afe7b
PE		 892 if (sk != NULL) {
893 if (security_sk_alloc(sk, family, priority))
894 goto out_free;
895
896 if (!try_module_get(prot->owner))
897 goto out_free_sec;
898 }
899
c308c1b2 900 return sk;
2e4afe7b
PE		 901
902out_free_sec:
903 security_sk_free(sk);
904out_free:
905 if (slab != NULL)
906 kmem_cache_free(slab, sk);
907 else
908 kfree(sk);
909 return NULL;
c308c1b2
PE		 910}
911
912static void sk_prot_free(struct proto *prot, struct sock *sk)
913{
914 struct kmem_cache *slab;
2e4afe7b 915 struct module *owner;
c308c1b2 916
2e4afe7b 917 owner = prot->owner;
c308c1b2 918 slab = prot->slab;
2e4afe7b
PE		 919
920 security_sk_free(sk);
c308c1b2
PE		 921 if (slab != NULL)
922 kmem_cache_free(slab, sk);
923 else
924 kfree(sk);
2e4afe7b 925 module_put(owner);
c308c1b2
PE		 926}
927
1da177e4
LT		 928/**
929 * sk_alloc - All socket objects are allocated here
c4ea43c5 930 * @net: the applicable net namespace
4dc3b16b
PP		 931 * @family: protocol family
932 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
933 * @prot: struct proto associated with this new sock instance
934 * @zero_it: if we should zero the newly allocated sock
1da177e4 935 */
1b8d7ae4 936struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
6257ff21 937 struct proto *prot)
1da177e4 938{
c308c1b2 939 struct sock *sk;
1da177e4 940
154adbc8 941 sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family);
1da177e4 942 if (sk) {
154adbc8
PE		 943 sk->sk_family = family;
944 /*
945 * See comment in struct sock definition to understand
946 * why we need sk_prot_creator -acme
947 */
948 sk->sk_prot = sk->sk_prot_creator = prot;
949 sock_lock_init(sk);
950 sk->sk_net = get_net(net);
1da177e4 951 }
a79af59e 952
2e4afe7b 953 return sk;
1da177e4
LT		 954}
955
956void sk_free(struct sock *sk)
957{
958 struct sk_filter *filter;
1da177e4
LT		 959
960 if (sk->sk_destruct)
961 sk->sk_destruct(sk);
962
fda9ef5d 963 filter = rcu_dereference(sk->sk_filter);
1da177e4 964 if (filter) {
309dd5fc 965 sk_filter_uncharge(sk, filter);
fda9ef5d 966 rcu_assign_pointer(sk->sk_filter, NULL);
1da177e4
LT		 967 }
968
969 sock_disable_timestamp(sk);
970
971 if (atomic_read(&sk->sk_omem_alloc))
972 printk(KERN_DEBUG "%s: optmem leakage (%d bytes) detected.\n",
973 __FUNCTION__, atomic_read(&sk->sk_omem_alloc));
974
1b8d7ae4 975 put_net(sk->sk_net);
c308c1b2 976 sk_prot_free(sk->sk_prot_creator, sk);
1da177e4
LT		 977}
978
dd0fc66f 979struct sock *sk_clone(const struct sock *sk, const gfp_t priority)
87d11ceb 980{
8fd1d178 981 struct sock *newsk;
87d11ceb 982
8fd1d178 983 newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family);
87d11ceb
ACM		 984 if (newsk != NULL) {
985 struct sk_filter *filter;
986
892c141e 987 sock_copy(newsk, sk);
87d11ceb
ACM		 988
989 /* SANITY */
1e2e6b89 990 get_net(newsk->sk_net);
87d11ceb
ACM		 991 sk_node_init(&newsk->sk_node);
992 sock_lock_init(newsk);
993 bh_lock_sock(newsk);
fa438ccf 994 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL;
87d11ceb
ACM		 995
996 atomic_set(&newsk->sk_rmem_alloc, 0);
997 atomic_set(&newsk->sk_wmem_alloc, 0);
998 atomic_set(&newsk->sk_omem_alloc, 0);
999 skb_queue_head_init(&newsk->sk_receive_queue);
1000 skb_queue_head_init(&newsk->sk_write_queue);
97fc2f08
CL		 1001#ifdef CONFIG_NET_DMA
1002 skb_queue_head_init(&newsk->sk_async_wait_queue);
1003#endif
87d11ceb
ACM		 1004
1005 rwlock_init(&newsk->sk_dst_lock);
1006 rwlock_init(&newsk->sk_callback_lock);
443aef0e
PZ		 1007 lockdep_set_class_and_name(&newsk->sk_callback_lock,
1008 af_callback_keys + newsk->sk_family,
1009 af_family_clock_key_strings[newsk->sk_family]);
87d11ceb
ACM		 1010
1011 newsk->sk_dst_cache = NULL;
1012 newsk->sk_wmem_queued = 0;
1013 newsk->sk_forward_alloc = 0;
1014 newsk->sk_send_head = NULL;
87d11ceb
ACM		 1015 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
1016
1017 sock_reset_flag(newsk, SOCK_DONE);
1018 skb_queue_head_init(&newsk->sk_error_queue);
1019
1020 filter = newsk->sk_filter;
1021 if (filter != NULL)
1022 sk_filter_charge(newsk, filter);
1023
1024 if (unlikely(xfrm_sk_clone_policy(newsk))) {
1025 /* It is still raw copy of parent, so invalidate
1026 * destructor and make plain sk_free() */
1027 newsk->sk_destruct = NULL;
1028 sk_free(newsk);
1029 newsk = NULL;
1030 goto out;
1031 }
1032
1033 newsk->sk_err = 0;
1034 newsk->sk_priority = 0;
1035 atomic_set(&newsk->sk_refcnt, 2);
1036
1037 /*
1038 * Increment the counter in the same struct proto as the master
1039 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
1040 * is the same as sk->sk_prot->socks, as this field was copied
1041 * with memcpy).
1042 *
1043 * This _changes_ the previous behaviour, where
1044 * tcp_create_openreq_child always was incrementing the
1045 * equivalent to tcp_prot->socks (inet_sock_nr), so this have
1046 * to be taken into account in all callers. -acme
1047 */
1048 sk_refcnt_debug_inc(newsk);
1049 newsk->sk_socket = NULL;
1050 newsk->sk_sleep = NULL;
1051
1052 if (newsk->sk_prot->sockets_allocated)
1053 atomic_inc(newsk->sk_prot->sockets_allocated);
1054 }
1055out:
1056 return newsk;
1057}
1058
1059EXPORT_SYMBOL_GPL(sk_clone);
1060
9958089a
AK		 1061void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
1062{
1063 __sk_dst_set(sk, dst);
1064 sk->sk_route_caps = dst->dev->features;
1065 if (sk->sk_route_caps & NETIF_F_GSO)
4fcd6b99 1066 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE;
9958089a
AK		 1067 if (sk_can_gso(sk)) {
1068 if (dst->header_len)
1069 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
1070 else
1071 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
1072 }
1073}
1074EXPORT_SYMBOL_GPL(sk_setup_caps);
1075
1da177e4
LT		 1076void __init sk_init(void)
1077{
1078 if (num_physpages <= 4096) {
1079 sysctl_wmem_max = 32767;
1080 sysctl_rmem_max = 32767;
1081 sysctl_wmem_default = 32767;
1082 sysctl_rmem_default = 32767;
1083 } else if (num_physpages >= 131072) {
1084 sysctl_wmem_max = 131071;
1085 sysctl_rmem_max = 131071;
1086 }
1087}
1088
1089/*
1090 * Simple resource managers for sockets.
1091 */
1092
1093
4ec93edb
YH		 1094/*
1095 * Write buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1096 */
1097void sock_wfree(struct sk_buff *skb)
1098{
1099 struct sock *sk = skb->sk;
1100
1101 /* In case it might be waiting for more memory. */
1102 atomic_sub(skb->truesize, &sk->sk_wmem_alloc);
1103 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE))
1104 sk->sk_write_space(sk);
1105 sock_put(sk);
1106}
1107
4ec93edb
YH		 1108/*
1109 * Read buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1110 */
1111void sock_rfree(struct sk_buff *skb)
1112{
1113 struct sock *sk = skb->sk;
1114
3ab224be 1115 skb_truesize_check(skb);
1da177e4 1116 atomic_sub(skb->truesize, &sk->sk_rmem_alloc);
3ab224be 1117 sk_mem_uncharge(skb->sk, skb->truesize);
1da177e4
LT		 1118}
1119
1120
1121int sock_i_uid(struct sock *sk)
1122{
1123 int uid;
1124
1125 read_lock(&sk->sk_callback_lock);
1126 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : 0;
1127 read_unlock(&sk->sk_callback_lock);
1128 return uid;
1129}
1130
1131unsigned long sock_i_ino(struct sock *sk)
1132{
1133 unsigned long ino;
1134
1135 read_lock(&sk->sk_callback_lock);
1136 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
1137 read_unlock(&sk->sk_callback_lock);
1138 return ino;
1139}
1140
1141/*
1142 * Allocate a skb from the socket's send buffer.
1143 */
86a76caf 1144struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
dd0fc66f 1145 gfp_t priority)
1da177e4
LT		 1146{
1147 if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
1148 struct sk_buff * skb = alloc_skb(size, priority);
1149 if (skb) {
1150 skb_set_owner_w(skb, sk);
1151 return skb;
1152 }
1153 }
1154 return NULL;
1155}
1156
1157/*
1158 * Allocate a skb from the socket's receive buffer.
4ec93edb 1159 */
86a76caf 1160struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force,
dd0fc66f 1161 gfp_t priority)
1da177e4
LT		 1162{
1163 if (force || atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) {
1164 struct sk_buff *skb = alloc_skb(size, priority);
1165 if (skb) {
1166 skb_set_owner_r(skb, sk);
1167 return skb;
1168 }
1169 }
1170 return NULL;
1171}
1172
4ec93edb 1173/*
1da177e4 1174 * Allocate a memory block from the socket's option memory buffer.
4ec93edb 1175 */
dd0fc66f 1176void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
1da177e4
LT		 1177{
1178 if ((unsigned)size <= sysctl_optmem_max &&
1179 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) {
1180 void *mem;
1181 /* First do the add, to avoid the race if kmalloc
4ec93edb 1182 * might sleep.
1da177e4
LT		 1183 */
1184 atomic_add(size, &sk->sk_omem_alloc);
1185 mem = kmalloc(size, priority);
1186 if (mem)
1187 return mem;
1188 atomic_sub(size, &sk->sk_omem_alloc);
1189 }
1190 return NULL;
1191}
1192
1193/*
1194 * Free an option memory block.
1195 */
1196void sock_kfree_s(struct sock *sk, void *mem, int size)
1197{
1198 kfree(mem);
1199 atomic_sub(size, &sk->sk_omem_alloc);
1200}
1201
1202/* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
1203 I think, these locks should be removed for datagram sockets.
1204 */
1205static long sock_wait_for_wmem(struct sock * sk, long timeo)
1206{
1207 DEFINE_WAIT(wait);
1208
1209 clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1210 for (;;) {
1211 if (!timeo)
1212 break;
1213 if (signal_pending(current))
1214 break;
1215 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1216 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
1217 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf)
1218 break;
1219 if (sk->sk_shutdown & SEND_SHUTDOWN)
1220 break;
1221 if (sk->sk_err)
1222 break;
1223 timeo = schedule_timeout(timeo);
1224 }
1225 finish_wait(sk->sk_sleep, &wait);
1226 return timeo;
1227}
1228
1229
1230/*
1231 * Generic send/receive buffer handlers
1232 */
1233
1234static struct sk_buff *sock_alloc_send_pskb(struct sock *sk,
1235 unsigned long header_len,
1236 unsigned long data_len,
1237 int noblock, int *errcode)
1238{
1239 struct sk_buff *skb;
7d877f3b 1240 gfp_t gfp_mask;
1da177e4
LT		 1241 long timeo;
1242 int err;
1243
1244 gfp_mask = sk->sk_allocation;
1245 if (gfp_mask & __GFP_WAIT)
1246 gfp_mask |= __GFP_REPEAT;
1247
1248 timeo = sock_sndtimeo(sk, noblock);
1249 while (1) {
1250 err = sock_error(sk);
1251 if (err != 0)
1252 goto failure;
1253
1254 err = -EPIPE;
1255 if (sk->sk_shutdown & SEND_SHUTDOWN)
1256 goto failure;
1257
1258 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
db38c179 1259 skb = alloc_skb(header_len, gfp_mask);
1da177e4
LT		 1260 if (skb) {
1261 int npages;
1262 int i;
1263
1264 /* No pages, we're done... */
1265 if (!data_len)
1266 break;
1267
1268 npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
1269 skb->truesize += data_len;
1270 skb_shinfo(skb)->nr_frags = npages;
1271 for (i = 0; i < npages; i++) {
1272 struct page *page;
1273 skb_frag_t *frag;
1274
1275 page = alloc_pages(sk->sk_allocation, 0);
1276 if (!page) {
1277 err = -ENOBUFS;
1278 skb_shinfo(skb)->nr_frags = i;
1279 kfree_skb(skb);
1280 goto failure;
1281 }
1282
1283 frag = &skb_shinfo(skb)->frags[i];
1284 frag->page = page;
1285 frag->page_offset = 0;
1286 frag->size = (data_len >= PAGE_SIZE ?
1287 PAGE_SIZE :
1288 data_len);
1289 data_len -= PAGE_SIZE;
1290 }
1291
1292 /* Full success... */
1293 break;
1294 }
1295 err = -ENOBUFS;
1296 goto failure;
1297 }
1298 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1299 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1300 err = -EAGAIN;
1301 if (!timeo)
1302 goto failure;
1303 if (signal_pending(current))
1304 goto interrupted;
1305 timeo = sock_wait_for_wmem(sk, timeo);
1306 }
1307
1308 skb_set_owner_w(skb, sk);
1309 return skb;
1310
1311interrupted:
1312 err = sock_intr_errno(timeo);
1313failure:
1314 *errcode = err;
1315 return NULL;
1316}
1317
4ec93edb 1318struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
1da177e4
LT		 1319 int noblock, int *errcode)
1320{
1321 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode);
1322}
1323
1324static void __lock_sock(struct sock *sk)
1325{
1326 DEFINE_WAIT(wait);
1327
e71a4783 1328 for (;;) {
1da177e4
LT		 1329 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
1330 TASK_UNINTERRUPTIBLE);
1331 spin_unlock_bh(&sk->sk_lock.slock);
1332 schedule();
1333 spin_lock_bh(&sk->sk_lock.slock);
e71a4783 1334 if (!sock_owned_by_user(sk))
1da177e4
LT		 1335 break;
1336 }
1337 finish_wait(&sk->sk_lock.wq, &wait);
1338}
1339
1340static void __release_sock(struct sock *sk)
1341{
1342 struct sk_buff *skb = sk->sk_backlog.head;
1343
1344 do {
1345 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
1346 bh_unlock_sock(sk);
1347
1348 do {
1349 struct sk_buff *next = skb->next;
1350
1351 skb->next = NULL;
1352 sk->sk_backlog_rcv(sk, skb);
1353
1354 /*
1355 * We are in process context here with softirqs
1356 * disabled, use cond_resched_softirq() to preempt.
1357 * This is safe to do because we've taken the backlog
1358 * queue private:
1359 */
1360 cond_resched_softirq();
1361
1362 skb = next;
1363 } while (skb != NULL);
1364
1365 bh_lock_sock(sk);
e71a4783 1366 } while ((skb = sk->sk_backlog.head) != NULL);
1da177e4
LT		 1367}
1368
1369/**
1370 * sk_wait_data - wait for data to arrive at sk_receive_queue
4dc3b16b
PP		 1371 * @sk: sock to wait on
1372 * @timeo: for how long
1da177e4
LT		 1373 *
1374 * Now socket state including sk->sk_err is changed only under lock,
1375 * hence we may omit checks after joining wait queue.
1376 * We check receive queue before schedule() only as optimization;
1377 * it is very likely that release_sock() added new data.
1378 */
1379int sk_wait_data(struct sock *sk, long *timeo)
1380{
1381 int rc;
1382 DEFINE_WAIT(wait);
1383
1384 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
1385 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1386 rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue));
1387 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1388 finish_wait(sk->sk_sleep, &wait);
1389 return rc;
1390}
1391
1392EXPORT_SYMBOL(sk_wait_data);
1393
3ab224be
HA		 1394/**
1395 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated
1396 * @sk: socket
1397 * @size: memory size to allocate
1398 * @kind: allocation type
1399 *
1400 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means
1401 * rmem allocation. This function assumes that protocols which have
1402 * memory_pressure use sk_wmem_queued as write buffer accounting.
1403 */
1404int __sk_mem_schedule(struct sock *sk, int size, int kind)
1405{
1406 struct proto *prot = sk->sk_prot;
1407 int amt = sk_mem_pages(size);
1408 int allocated;
1409
1410 sk->sk_forward_alloc += amt * SK_MEM_QUANTUM;
1411 allocated = atomic_add_return(amt, prot->memory_allocated);
1412
1413 /* Under limit. */
1414 if (allocated <= prot->sysctl_mem[0]) {
1415 if (prot->memory_pressure && *prot->memory_pressure)
1416 *prot->memory_pressure = 0;
1417 return 1;
1418 }
1419
1420 /* Under pressure. */
1421 if (allocated > prot->sysctl_mem[1])
1422 if (prot->enter_memory_pressure)
1423 prot->enter_memory_pressure();
1424
1425 /* Over hard limit. */
1426 if (allocated > prot->sysctl_mem[2])
1427 goto suppress_allocation;
1428
1429 /* guarantee minimum buffer size under pressure */
1430 if (kind == SK_MEM_RECV) {
1431 if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0])
1432 return 1;
1433 } else { /* SK_MEM_SEND */
1434 if (sk->sk_type == SOCK_STREAM) {
1435 if (sk->sk_wmem_queued < prot->sysctl_wmem[0])
1436 return 1;
1437 } else if (atomic_read(&sk->sk_wmem_alloc) <
1438 prot->sysctl_wmem[0])
1439 return 1;
1440 }
1441
1442 if (prot->memory_pressure) {
1443 if (!*prot->memory_pressure ||
1444 prot->sysctl_mem[2] > atomic_read(prot->sockets_allocated) *
1445 sk_mem_pages(sk->sk_wmem_queued +
1446 atomic_read(&sk->sk_rmem_alloc) +
1447 sk->sk_forward_alloc))
1448 return 1;
1449 }
1450
1451suppress_allocation:
1452
1453 if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) {
1454 sk_stream_moderate_sndbuf(sk);
1455
1456 /* Fail only if socket is _under_ its sndbuf.
1457 * In this case we cannot block, so that we have to fail.
1458 */
1459 if (sk->sk_wmem_queued + size >= sk->sk_sndbuf)
1460 return 1;
1461 }
1462
1463 /* Alas. Undo changes. */
1464 sk->sk_forward_alloc -= amt * SK_MEM_QUANTUM;
1465 atomic_sub(amt, prot->memory_allocated);
1466 return 0;
1467}
1468
1469EXPORT_SYMBOL(__sk_mem_schedule);
1470
1471/**
1472 * __sk_reclaim - reclaim memory_allocated
1473 * @sk: socket
1474 */
1475void __sk_mem_reclaim(struct sock *sk)
1476{
1477 struct proto *prot = sk->sk_prot;
1478
680a5a50 1479 atomic_sub(sk->sk_forward_alloc >> SK_MEM_QUANTUM_SHIFT,
3ab224be
HA		 1480 prot->memory_allocated);
1481 sk->sk_forward_alloc &= SK_MEM_QUANTUM - 1;
1482
1483 if (prot->memory_pressure && *prot->memory_pressure &&
1484 (atomic_read(prot->memory_allocated) < prot->sysctl_mem[0]))
1485 *prot->memory_pressure = 0;
1486}
1487
1488EXPORT_SYMBOL(__sk_mem_reclaim);
1489
1490
1da177e4
LT		 1491/*
1492 * Set of default routines for initialising struct proto_ops when
1493 * the protocol does not support a particular function. In certain
1494 * cases where it makes no sense for a protocol to have a "do nothing"
1495 * function, some default processing is provided.
1496 */
1497
1498int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
1499{
1500 return -EOPNOTSUPP;
1501}
1502
4ec93edb 1503int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 1504 int len, int flags)
1505{
1506 return -EOPNOTSUPP;
1507}
1508
1509int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
1510{
1511 return -EOPNOTSUPP;
1512}
1513
1514int sock_no_accept(struct socket *sock, struct socket *newsock, int flags)
1515{
1516 return -EOPNOTSUPP;
1517}
1518
4ec93edb 1519int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 1520 int *len, int peer)
1521{
1522 return -EOPNOTSUPP;
1523}
1524
1525unsigned int sock_no_poll(struct file * file, struct socket *sock, poll_table *pt)
1526{
1527 return 0;
1528}
1529
1530int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1531{
1532 return -EOPNOTSUPP;
1533}
1534
1535int sock_no_listen(struct socket *sock, int backlog)
1536{
1537 return -EOPNOTSUPP;
1538}
1539
1540int sock_no_shutdown(struct socket *sock, int how)
1541{
1542 return -EOPNOTSUPP;
1543}
1544
1545int sock_no_setsockopt(struct socket *sock, int level, int optname,
1546 char __user *optval, int optlen)
1547{
1548 return -EOPNOTSUPP;
1549}
1550
1551int sock_no_getsockopt(struct socket *sock, int level, int optname,
1552 char __user *optval, int __user *optlen)
1553{
1554 return -EOPNOTSUPP;
1555}
1556
1557int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
1558 size_t len)
1559{
1560 return -EOPNOTSUPP;
1561}
1562
1563int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
1564 size_t len, int flags)
1565{
1566 return -EOPNOTSUPP;
1567}
1568
1569int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
1570{
1571 /* Mirror missing mmap method error code */
1572 return -ENODEV;
1573}
1574
1575ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
1576{
1577 ssize_t res;
1578 struct msghdr msg = {.msg_flags = flags};
1579 struct kvec iov;
1580 char *kaddr = kmap(page);
1581 iov.iov_base = kaddr + offset;
1582 iov.iov_len = size;
1583 res = kernel_sendmsg(sock, &msg, &iov, 1, size);
1584 kunmap(page);
1585 return res;
1586}
1587
1588/*
1589 * Default Socket Callbacks
1590 */
1591
1592static void sock_def_wakeup(struct sock *sk)
1593{
1594 read_lock(&sk->sk_callback_lock);
1595 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
1596 wake_up_interruptible_all(sk->sk_sleep);
1597 read_unlock(&sk->sk_callback_lock);
1598}
1599
1600static void sock_def_error_report(struct sock *sk)
1601{
1602 read_lock(&sk->sk_callback_lock);
1603 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
1604 wake_up_interruptible(sk->sk_sleep);
8d8ad9d7 1605 sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR);
1da177e4
LT		 1606 read_unlock(&sk->sk_callback_lock);
1607}
1608
1609static void sock_def_readable(struct sock *sk, int len)
1610{
1611 read_lock(&sk->sk_callback_lock);
1612 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
1613 wake_up_interruptible(sk->sk_sleep);
8d8ad9d7 1614 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
1da177e4
LT		 1615 read_unlock(&sk->sk_callback_lock);
1616}
1617
1618static void sock_def_write_space(struct sock *sk)
1619{
1620 read_lock(&sk->sk_callback_lock);
1621
1622 /* Do not wake up a writer until he can make "significant"
1623 * progress. --DaveM
1624 */
e71a4783 1625 if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) {
1da177e4
LT		 1626 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
1627 wake_up_interruptible(sk->sk_sleep);
1628
1629 /* Should agree with poll, otherwise some programs break */
1630 if (sock_writeable(sk))
8d8ad9d7 1631 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
1da177e4
LT		 1632 }
1633
1634 read_unlock(&sk->sk_callback_lock);
1635}
1636
1637static void sock_def_destruct(struct sock *sk)
1638{
a51482bd 1639 kfree(sk->sk_protinfo);
1da177e4
LT		 1640}
1641
1642void sk_send_sigurg(struct sock *sk)
1643{
1644 if (sk->sk_socket && sk->sk_socket->file)
1645 if (send_sigurg(&sk->sk_socket->file->f_owner))
8d8ad9d7 1646 sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI);
1da177e4
LT		 1647}
1648
1649void sk_reset_timer(struct sock *sk, struct timer_list* timer,
1650 unsigned long expires)
1651{
1652 if (!mod_timer(timer, expires))
1653 sock_hold(sk);
1654}
1655
1656EXPORT_SYMBOL(sk_reset_timer);
1657
1658void sk_stop_timer(struct sock *sk, struct timer_list* timer)
1659{
1660 if (timer_pending(timer) && del_timer(timer))
1661 __sock_put(sk);
1662}
1663
1664EXPORT_SYMBOL(sk_stop_timer);
1665
1666void sock_init_data(struct socket *sock, struct sock *sk)
1667{
1668 skb_queue_head_init(&sk->sk_receive_queue);
1669 skb_queue_head_init(&sk->sk_write_queue);
1670 skb_queue_head_init(&sk->sk_error_queue);
97fc2f08
CL		 1671#ifdef CONFIG_NET_DMA
1672 skb_queue_head_init(&sk->sk_async_wait_queue);
1673#endif
1da177e4
LT		 1674
1675 sk->sk_send_head = NULL;
1676
1677 init_timer(&sk->sk_timer);
4ec93edb 1678
1da177e4
LT		 1679 sk->sk_allocation = GFP_KERNEL;
1680 sk->sk_rcvbuf = sysctl_rmem_default;
1681 sk->sk_sndbuf = sysctl_wmem_default;
1682 sk->sk_state = TCP_CLOSE;
1683 sk->sk_socket = sock;
1684
1685 sock_set_flag(sk, SOCK_ZAPPED);
1686
e71a4783 1687 if (sock) {
1da177e4
LT		 1688 sk->sk_type = sock->type;
1689 sk->sk_sleep = &sock->wait;
1690 sock->sk = sk;
1691 } else
1692 sk->sk_sleep = NULL;
1693
1694 rwlock_init(&sk->sk_dst_lock);
1695 rwlock_init(&sk->sk_callback_lock);
443aef0e
PZ		 1696 lockdep_set_class_and_name(&sk->sk_callback_lock,
1697 af_callback_keys + sk->sk_family,
1698 af_family_clock_key_strings[sk->sk_family]);
1da177e4
LT		 1699
1700 sk->sk_state_change = sock_def_wakeup;
1701 sk->sk_data_ready = sock_def_readable;
1702 sk->sk_write_space = sock_def_write_space;
1703 sk->sk_error_report = sock_def_error_report;
1704 sk->sk_destruct = sock_def_destruct;
1705
1706 sk->sk_sndmsg_page = NULL;
1707 sk->sk_sndmsg_off = 0;
1708
1709 sk->sk_peercred.pid = 0;
1710 sk->sk_peercred.uid = -1;
1711 sk->sk_peercred.gid = -1;
1712 sk->sk_write_pending = 0;
1713 sk->sk_rcvlowat = 1;
1714 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
1715 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
1716
b7aa0bf7 1717 sk->sk_stamp = ktime_set(-1L, -1L);
1da177e4
LT		 1718
1719 atomic_set(&sk->sk_refcnt, 1);
33c732c3 1720 atomic_set(&sk->sk_drops, 0);
1da177e4
LT		 1721}
1722
fcc70d5f 1723void fastcall lock_sock_nested(struct sock *sk, int subclass)
1da177e4
LT		 1724{
1725 might_sleep();
a5b5bb9a 1726 spin_lock_bh(&sk->sk_lock.slock);
d2e9117c 1727 if (sk->sk_lock.owned)
1da177e4 1728 __lock_sock(sk);
d2e9117c 1729 sk->sk_lock.owned = 1;
a5b5bb9a
IM		 1730 spin_unlock(&sk->sk_lock.slock);
1731 /*
1732 * The sk_lock has mutex_lock() semantics here:
1733 */
fcc70d5f 1734 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
a5b5bb9a 1735 local_bh_enable();
1da177e4
LT		 1736}
1737
fcc70d5f 1738EXPORT_SYMBOL(lock_sock_nested);
1da177e4
LT		 1739
1740void fastcall release_sock(struct sock *sk)
1741{
a5b5bb9a
IM		 1742 /*
1743 * The sk_lock has mutex_unlock() semantics:
1744 */
1745 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
1746
1747 spin_lock_bh(&sk->sk_lock.slock);
1da177e4
LT		 1748 if (sk->sk_backlog.tail)
1749 __release_sock(sk);
d2e9117c 1750 sk->sk_lock.owned = 0;
a5b5bb9a
IM		 1751 if (waitqueue_active(&sk->sk_lock.wq))
1752 wake_up(&sk->sk_lock.wq);
1753 spin_unlock_bh(&sk->sk_lock.slock);
1da177e4
LT		 1754}
1755EXPORT_SYMBOL(release_sock);
1756
1757int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
4ec93edb 1758{
b7aa0bf7 1759 struct timeval tv;
1da177e4
LT		 1760 if (!sock_flag(sk, SOCK_TIMESTAMP))
1761 sock_enable_timestamp(sk);
b7aa0bf7
ED		 1762 tv = ktime_to_timeval(sk->sk_stamp);
1763 if (tv.tv_sec == -1)
1da177e4 1764 return -ENOENT;
b7aa0bf7
ED		 1765 if (tv.tv_sec == 0) {
1766 sk->sk_stamp = ktime_get_real();
1767 tv = ktime_to_timeval(sk->sk_stamp);
1768 }
1769 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0;
4ec93edb 1770}
1da177e4
LT		 1771EXPORT_SYMBOL(sock_get_timestamp);
1772
ae40eb1e
ED		 1773int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
1774{
1775 struct timespec ts;
1776 if (!sock_flag(sk, SOCK_TIMESTAMP))
1777 sock_enable_timestamp(sk);
1778 ts = ktime_to_timespec(sk->sk_stamp);
1779 if (ts.tv_sec == -1)
1780 return -ENOENT;
1781 if (ts.tv_sec == 0) {
1782 sk->sk_stamp = ktime_get_real();
1783 ts = ktime_to_timespec(sk->sk_stamp);
1784 }
1785 return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0;
1786}
1787EXPORT_SYMBOL(sock_get_timestampns);
1788
1da177e4 1789void sock_enable_timestamp(struct sock *sk)
4ec93edb
YH		 1790{
1791 if (!sock_flag(sk, SOCK_TIMESTAMP)) {
1da177e4
LT		 1792 sock_set_flag(sk, SOCK_TIMESTAMP);
1793 net_enable_timestamp();
1794 }
1795}
1da177e4
LT		 1796
1797/*
1798 * Get a socket option on an socket.
1799 *
1800 * FIX: POSIX 1003.1g is very ambiguous here. It states that
1801 * asynchronous errors should be reported by getsockopt. We assume
1802 * this means if you specify SO_ERROR (otherwise whats the point of it).
1803 */
1804int sock_common_getsockopt(struct socket *sock, int level, int optname,
1805 char __user *optval, int __user *optlen)
1806{
1807 struct sock *sk = sock->sk;
1808
1809 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
1810}
1811
1812EXPORT_SYMBOL(sock_common_getsockopt);
1813
3fdadf7d 1814#ifdef CONFIG_COMPAT
543d9cfe
ACM		 1815int compat_sock_common_getsockopt(struct socket *sock, int level, int optname,
1816 char __user *optval, int __user *optlen)
3fdadf7d
DM		 1817{
1818 struct sock *sk = sock->sk;
1819
1e51f951 1820 if (sk->sk_prot->compat_getsockopt != NULL)
543d9cfe
ACM		 1821 return sk->sk_prot->compat_getsockopt(sk, level, optname,
1822 optval, optlen);
3fdadf7d
DM		 1823 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
1824}
1825EXPORT_SYMBOL(compat_sock_common_getsockopt);
1826#endif
1827
1da177e4
LT		 1828int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock,
1829 struct msghdr *msg, size_t size, int flags)
1830{
1831 struct sock *sk = sock->sk;
1832 int addr_len = 0;
1833 int err;
1834
1835 err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT,
1836 flags & ~MSG_DONTWAIT, &addr_len);
1837 if (err >= 0)
1838 msg->msg_namelen = addr_len;
1839 return err;
1840}
1841
1842EXPORT_SYMBOL(sock_common_recvmsg);
1843
1844/*
1845 * Set socket options on an inet socket.
1846 */
1847int sock_common_setsockopt(struct socket *sock, int level, int optname,
1848 char __user *optval, int optlen)
1849{
1850 struct sock *sk = sock->sk;
1851
1852 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
1853}
1854
1855EXPORT_SYMBOL(sock_common_setsockopt);
1856
3fdadf7d 1857#ifdef CONFIG_COMPAT
543d9cfe
ACM		 1858int compat_sock_common_setsockopt(struct socket *sock, int level, int optname,
1859 char __user *optval, int optlen)
3fdadf7d
DM		 1860{
1861 struct sock *sk = sock->sk;
1862
543d9cfe
ACM		 1863 if (sk->sk_prot->compat_setsockopt != NULL)
1864 return sk->sk_prot->compat_setsockopt(sk, level, optname,
1865 optval, optlen);
3fdadf7d
DM		 1866 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
1867}
1868EXPORT_SYMBOL(compat_sock_common_setsockopt);
1869#endif
1870
1da177e4
LT		 1871void sk_common_release(struct sock *sk)
1872{
1873 if (sk->sk_prot->destroy)
1874 sk->sk_prot->destroy(sk);
1875
1876 /*
1877 * Observation: when sock_common_release is called, processes have
1878 * no access to socket. But net still has.
1879 * Step one, detach it from networking:
1880 *
1881 * A. Remove from hash tables.
1882 */
1883
1884 sk->sk_prot->unhash(sk);
1885
1886 /*
1887 * In this point socket cannot receive new packets, but it is possible
1888 * that some packets are in flight because some CPU runs receiver and
1889 * did hash table lookup before we unhashed socket. They will achieve
1890 * receive queue and will be purged by socket destructor.
1891 *
1892 * Also we still have packets pending on receive queue and probably,
1893 * our own packets waiting in device queues. sock_destroy will drain
1894 * receive queue, but transmitted packets will delay socket destruction
1895 * until the last reference will be released.
1896 */
1897
1898 sock_orphan(sk);
1899
1900 xfrm_sk_free_policy(sk);
1901
e6848976 1902 sk_refcnt_debug_release(sk);
1da177e4
LT		 1903 sock_put(sk);
1904}
1905
1906EXPORT_SYMBOL(sk_common_release);
1907
1908static DEFINE_RWLOCK(proto_list_lock);
1909static LIST_HEAD(proto_list);
1910
b733c007
PE		 1911int proto_register(struct proto *prot, int alloc_slab)
1912{
1913 char *request_sock_slab_name = NULL;
1914 char *timewait_sock_slab_name;
1915
ebb53d75
ACM		 1916 if (pcounter_alloc(&prot->inuse) != 0) {
1917 printk(KERN_CRIT "%s: Can't alloc inuse counters!\n", prot->name);
b733c007 1918 goto out;
ebb53d75 1919 }
b733c007 1920
1da177e4
LT		 1921 if (alloc_slab) {
1922 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0,
20c2df83 1923 SLAB_HWCACHE_ALIGN, NULL);
1da177e4
LT		 1924
1925 if (prot->slab == NULL) {
1926 printk(KERN_CRIT "%s: Can't create sock SLAB cache!\n",
1927 prot->name);
286ab3d4 1928 goto out_free_inuse;
1da177e4 1929 }
2e6599cb
ACM		 1930
1931 if (prot->rsk_prot != NULL) {
1932 static const char mask[] = "request_sock_%s";
1933
1934 request_sock_slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL);
1935 if (request_sock_slab_name == NULL)
1936 goto out_free_sock_slab;
1937
1938 sprintf(request_sock_slab_name, mask, prot->name);
1939 prot->rsk_prot->slab = kmem_cache_create(request_sock_slab_name,
1940 prot->rsk_prot->obj_size, 0,
20c2df83 1941 SLAB_HWCACHE_ALIGN, NULL);
2e6599cb
ACM		 1942
1943 if (prot->rsk_prot->slab == NULL) {
1944 printk(KERN_CRIT "%s: Can't create request sock SLAB cache!\n",
1945 prot->name);
1946 goto out_free_request_sock_slab_name;
1947 }
1948 }
8feaf0c0 1949
6d6ee43e 1950 if (prot->twsk_prot != NULL) {
8feaf0c0
ACM		 1951 static const char mask[] = "tw_sock_%s";
1952
1953 timewait_sock_slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL);
1954
1955 if (timewait_sock_slab_name == NULL)
1956 goto out_free_request_sock_slab;
1957
1958 sprintf(timewait_sock_slab_name, mask, prot->name);
6d6ee43e
ACM		 1959 prot->twsk_prot->twsk_slab =
1960 kmem_cache_create(timewait_sock_slab_name,
1961 prot->twsk_prot->twsk_obj_size,
1962 0, SLAB_HWCACHE_ALIGN,
20c2df83 1963 NULL);
6d6ee43e 1964 if (prot->twsk_prot->twsk_slab == NULL)
8feaf0c0
ACM		 1965 goto out_free_timewait_sock_slab_name;
1966 }
1da177e4
LT		 1967 }
1968
2a278051 1969 write_lock(&proto_list_lock);
1da177e4 1970 list_add(&prot->node, &proto_list);
1da177e4 1971 write_unlock(&proto_list_lock);
b733c007
PE		 1972 return 0;
1973
8feaf0c0
ACM		 1974out_free_timewait_sock_slab_name:
1975 kfree(timewait_sock_slab_name);
1976out_free_request_sock_slab:
1977 if (prot->rsk_prot && prot->rsk_prot->slab) {
1978 kmem_cache_destroy(prot->rsk_prot->slab);
1979 prot->rsk_prot->slab = NULL;
1980 }
2e6599cb
ACM		 1981out_free_request_sock_slab_name:
1982 kfree(request_sock_slab_name);
1983out_free_sock_slab:
1984 kmem_cache_destroy(prot->slab);
1985 prot->slab = NULL;
286ab3d4 1986out_free_inuse:
ebb53d75 1987 pcounter_free(&prot->inuse);
b733c007
PE		 1988out:
1989 return -ENOBUFS;
1da177e4
LT		 1990}
1991
1992EXPORT_SYMBOL(proto_register);
1993
1994void proto_unregister(struct proto *prot)
1995{
1996 write_lock(&proto_list_lock);
0a3f4358
PM		 1997 list_del(&prot->node);
1998 write_unlock(&proto_list_lock);
1da177e4 1999
ebb53d75
ACM		 2000 pcounter_free(&prot->inuse);
2001
1da177e4
LT		 2002 if (prot->slab != NULL) {
2003 kmem_cache_destroy(prot->slab);
2004 prot->slab = NULL;
2005 }
2006
2e6599cb
ACM		 2007 if (prot->rsk_prot != NULL && prot->rsk_prot->slab != NULL) {
2008 const char *name = kmem_cache_name(prot->rsk_prot->slab);
2009
2010 kmem_cache_destroy(prot->rsk_prot->slab);
2011 kfree(name);
2012 prot->rsk_prot->slab = NULL;
2013 }
2014
6d6ee43e
ACM		 2015 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) {
2016 const char *name = kmem_cache_name(prot->twsk_prot->twsk_slab);
8feaf0c0 2017
6d6ee43e 2018 kmem_cache_destroy(prot->twsk_prot->twsk_slab);
8feaf0c0 2019 kfree(name);
6d6ee43e 2020 prot->twsk_prot->twsk_slab = NULL;
8feaf0c0 2021 }
1da177e4
LT		 2022}
2023
2024EXPORT_SYMBOL(proto_unregister);
2025
2026#ifdef CONFIG_PROC_FS
1da177e4 2027static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
9a429c49 2028 __acquires(proto_list_lock)
1da177e4
LT		 2029{
2030 read_lock(&proto_list_lock);
60f0438a 2031 return seq_list_start_head(&proto_list, *pos);
1da177e4
LT		 2032}
2033
2034static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2035{
60f0438a 2036 return seq_list_next(v, &proto_list, pos);
1da177e4
LT		 2037}
2038
2039static void proto_seq_stop(struct seq_file *seq, void *v)
9a429c49 2040 __releases(proto_list_lock)
1da177e4
LT		 2041{
2042 read_unlock(&proto_list_lock);
2043}
2044
2045static char proto_method_implemented(const void *method)
2046{
2047 return method == NULL ? 'n' : 'y';
2048}
2049
2050static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
2051{
2052 seq_printf(seq, "%-9s %4u %6d %6d %-3s %6u %-3s %-10s "
2053 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
2054 proto->name,
2055 proto->obj_size,
2056 proto->sockets_allocated != NULL ? atomic_read(proto->sockets_allocated) : -1,
2057 proto->memory_allocated != NULL ? atomic_read(proto->memory_allocated) : -1,
2058 proto->memory_pressure != NULL ? *proto->memory_pressure ? "yes" : "no" : "NI",
2059 proto->max_header,
2060 proto->slab == NULL ? "no" : "yes",
2061 module_name(proto->owner),
2062 proto_method_implemented(proto->close),
2063 proto_method_implemented(proto->connect),
2064 proto_method_implemented(proto->disconnect),
2065 proto_method_implemented(proto->accept),
2066 proto_method_implemented(proto->ioctl),
2067 proto_method_implemented(proto->init),
2068 proto_method_implemented(proto->destroy),
2069 proto_method_implemented(proto->shutdown),
2070 proto_method_implemented(proto->setsockopt),
2071 proto_method_implemented(proto->getsockopt),
2072 proto_method_implemented(proto->sendmsg),
2073 proto_method_implemented(proto->recvmsg),
2074 proto_method_implemented(proto->sendpage),
2075 proto_method_implemented(proto->bind),
2076 proto_method_implemented(proto->backlog_rcv),
2077 proto_method_implemented(proto->hash),
2078 proto_method_implemented(proto->unhash),
2079 proto_method_implemented(proto->get_port),
2080 proto_method_implemented(proto->enter_memory_pressure));
2081}
2082
2083static int proto_seq_show(struct seq_file *seq, void *v)
2084{
60f0438a 2085 if (v == &proto_list)
1da177e4
LT		 2086 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
2087 "protocol",
2088 "size",
2089 "sockets",
2090 "memory",
2091 "press",
2092 "maxhdr",
2093 "slab",
2094 "module",
2095 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
2096 else
60f0438a 2097 proto_seq_printf(seq, list_entry(v, struct proto, node));
1da177e4
LT		 2098 return 0;
2099}
2100
f690808e 2101static const struct seq_operations proto_seq_ops = {
1da177e4
LT		 2102 .start = proto_seq_start,
2103 .next = proto_seq_next,
2104 .stop = proto_seq_stop,
2105 .show = proto_seq_show,
2106};
2107
2108static int proto_seq_open(struct inode *inode, struct file *file)
2109{
2110 return seq_open(file, &proto_seq_ops);
2111}
2112
9a32144e 2113static const struct file_operations proto_seq_fops = {
1da177e4
LT		 2114 .owner = THIS_MODULE,
2115 .open = proto_seq_open,
2116 .read = seq_read,
2117 .llseek = seq_lseek,
2118 .release = seq_release,
2119};
2120
2121static int __init proto_init(void)
2122{
2123 /* register /proc/net/protocols */
457c4cbc 2124 return proc_net_fops_create(&init_net, "protocols", S_IRUGO, &proto_seq_fops) == NULL ? -ENOBUFS : 0;
1da177e4
LT		 2125}
2126
2127subsys_initcall(proto_init);
2128
2129#endif /* PROC_FS */
2130
2131EXPORT_SYMBOL(sk_alloc);
2132EXPORT_SYMBOL(sk_free);
2133EXPORT_SYMBOL(sk_send_sigurg);
2134EXPORT_SYMBOL(sock_alloc_send_skb);
2135EXPORT_SYMBOL(sock_init_data);
2136EXPORT_SYMBOL(sock_kfree_s);
2137EXPORT_SYMBOL(sock_kmalloc);
2138EXPORT_SYMBOL(sock_no_accept);
2139EXPORT_SYMBOL(sock_no_bind);
2140EXPORT_SYMBOL(sock_no_connect);
2141EXPORT_SYMBOL(sock_no_getname);
2142EXPORT_SYMBOL(sock_no_getsockopt);
2143EXPORT_SYMBOL(sock_no_ioctl);
2144EXPORT_SYMBOL(sock_no_listen);
2145EXPORT_SYMBOL(sock_no_mmap);
2146EXPORT_SYMBOL(sock_no_poll);
2147EXPORT_SYMBOL(sock_no_recvmsg);
2148EXPORT_SYMBOL(sock_no_sendmsg);
2149EXPORT_SYMBOL(sock_no_sendpage);
2150EXPORT_SYMBOL(sock_no_setsockopt);
2151EXPORT_SYMBOL(sock_no_shutdown);
2152EXPORT_SYMBOL(sock_no_socketpair);
2153EXPORT_SYMBOL(sock_rfree);
2154EXPORT_SYMBOL(sock_setsockopt);
2155EXPORT_SYMBOL(sock_wfree);
2156EXPORT_SYMBOL(sock_wmalloc);
2157EXPORT_SYMBOL(sock_i_uid);
2158EXPORT_SYMBOL(sock_i_ino);
1da177e4 2159EXPORT_SYMBOL(sysctl_optmem_max);