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[NET]: Rename inet_frag.h identifiers COMPLETE, FIRST_IN, LAST_IN to INET_FRAG_*
[GitHub/mt8127/android_kernel_alcatel_ttab.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
3b1e0a65 375 struct net *net = sock_net(sk);
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;
4a19ec58
LAT		 670 case SO_MARK:
671 if (!capable(CAP_NET_ADMIN))
672 ret = -EPERM;
673 else {
674 sk->sk_mark = val;
675 }
676 break;
877ce7c1 677
1da177e4
LT		 678 /* We implement the SO_SNDLOWAT etc to
679 not be settable (1003.1g 5.3) */
e71a4783
SH		 680 default:
681 ret = -ENOPROTOOPT;
682 break;
4ec93edb 683 }
1da177e4
LT		 684 release_sock(sk);
685 return ret;
686}
687
688
689int sock_getsockopt(struct socket *sock, int level, int optname,
690 char __user *optval, int __user *optlen)
691{
692 struct sock *sk = sock->sk;
4ec93edb 693
e71a4783 694 union {
4ec93edb
YH		 695 int val;
696 struct linger ling;
1da177e4
LT		 697 struct timeval tm;
698 } v;
4ec93edb 699
1da177e4
LT		 700 unsigned int lv = sizeof(int);
701 int len;
4ec93edb 702
e71a4783 703 if (get_user(len, optlen))
4ec93edb 704 return -EFAULT;
e71a4783 705 if (len < 0)
1da177e4 706 return -EINVAL;
4ec93edb 707
e71a4783
SH		 708 switch(optname) {
709 case SO_DEBUG:
710 v.val = sock_flag(sk, SOCK_DBG);
711 break;
712
713 case SO_DONTROUTE:
714 v.val = sock_flag(sk, SOCK_LOCALROUTE);
715 break;
716
717 case SO_BROADCAST:
718 v.val = !!sock_flag(sk, SOCK_BROADCAST);
719 break;
720
721 case SO_SNDBUF:
722 v.val = sk->sk_sndbuf;
723 break;
724
725 case SO_RCVBUF:
726 v.val = sk->sk_rcvbuf;
727 break;
728
729 case SO_REUSEADDR:
730 v.val = sk->sk_reuse;
731 break;
732
733 case SO_KEEPALIVE:
734 v.val = !!sock_flag(sk, SOCK_KEEPOPEN);
735 break;
736
737 case SO_TYPE:
738 v.val = sk->sk_type;
739 break;
740
741 case SO_ERROR:
742 v.val = -sock_error(sk);
743 if (v.val==0)
744 v.val = xchg(&sk->sk_err_soft, 0);
745 break;
746
747 case SO_OOBINLINE:
748 v.val = !!sock_flag(sk, SOCK_URGINLINE);
749 break;
750
751 case SO_NO_CHECK:
752 v.val = sk->sk_no_check;
753 break;
754
755 case SO_PRIORITY:
756 v.val = sk->sk_priority;
757 break;
758
759 case SO_LINGER:
760 lv = sizeof(v.ling);
761 v.ling.l_onoff = !!sock_flag(sk, SOCK_LINGER);
762 v.ling.l_linger = sk->sk_lingertime / HZ;
763 break;
764
765 case SO_BSDCOMPAT:
766 sock_warn_obsolete_bsdism("getsockopt");
767 break;
768
769 case SO_TIMESTAMP:
92f37fd2
ED		 770 v.val = sock_flag(sk, SOCK_RCVTSTAMP) &&
771 !sock_flag(sk, SOCK_RCVTSTAMPNS);
772 break;
773
774 case SO_TIMESTAMPNS:
775 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS);
e71a4783
SH		 776 break;
777
778 case SO_RCVTIMEO:
779 lv=sizeof(struct timeval);
780 if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) {
781 v.tm.tv_sec = 0;
782 v.tm.tv_usec = 0;
783 } else {
784 v.tm.tv_sec = sk->sk_rcvtimeo / HZ;
785 v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ;
786 }
787 break;
788
789 case SO_SNDTIMEO:
790 lv=sizeof(struct timeval);
791 if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) {
792 v.tm.tv_sec = 0;
793 v.tm.tv_usec = 0;
794 } else {
795 v.tm.tv_sec = sk->sk_sndtimeo / HZ;
796 v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ;
797 }
798 break;
1da177e4 799
e71a4783
SH		 800 case SO_RCVLOWAT:
801 v.val = sk->sk_rcvlowat;
802 break;
1da177e4 803
e71a4783
SH		 804 case SO_SNDLOWAT:
805 v.val=1;
806 break;
1da177e4 807
e71a4783
SH		 808 case SO_PASSCRED:
809 v.val = test_bit(SOCK_PASSCRED, &sock->flags) ? 1 : 0;
810 break;
1da177e4 811
e71a4783
SH		 812 case SO_PEERCRED:
813 if (len > sizeof(sk->sk_peercred))
814 len = sizeof(sk->sk_peercred);
815 if (copy_to_user(optval, &sk->sk_peercred, len))
816 return -EFAULT;
817 goto lenout;
1da177e4 818
e71a4783
SH		 819 case SO_PEERNAME:
820 {
821 char address[128];
822
823 if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2))
824 return -ENOTCONN;
825 if (lv < len)
826 return -EINVAL;
827 if (copy_to_user(optval, address, len))
828 return -EFAULT;
829 goto lenout;
830 }
1da177e4 831
e71a4783
SH		 832 /* Dubious BSD thing... Probably nobody even uses it, but
833 * the UNIX standard wants it for whatever reason... -DaveM
834 */
835 case SO_ACCEPTCONN:
836 v.val = sk->sk_state == TCP_LISTEN;
837 break;
1da177e4 838
e71a4783
SH		 839 case SO_PASSSEC:
840 v.val = test_bit(SOCK_PASSSEC, &sock->flags) ? 1 : 0;
841 break;
877ce7c1 842
e71a4783
SH		 843 case SO_PEERSEC:
844 return security_socket_getpeersec_stream(sock, optval, optlen, len);
1da177e4 845
4a19ec58
LAT		 846 case SO_MARK:
847 v.val = sk->sk_mark;
848 break;
849
e71a4783
SH		 850 default:
851 return -ENOPROTOOPT;
1da177e4 852 }
e71a4783 853
1da177e4
LT		 854 if (len > lv)
855 len = lv;
856 if (copy_to_user(optval, &v, len))
857 return -EFAULT;
858lenout:
4ec93edb
YH		 859 if (put_user(len, optlen))
860 return -EFAULT;
861 return 0;
1da177e4
LT		 862}
863
a5b5bb9a
IM		 864/*
865 * Initialize an sk_lock.
866 *
867 * (We also register the sk_lock with the lock validator.)
868 */
b6f99a21 869static inline void sock_lock_init(struct sock *sk)
a5b5bb9a 870{
ed07536e
PZ		 871 sock_lock_init_class_and_name(sk,
872 af_family_slock_key_strings[sk->sk_family],
873 af_family_slock_keys + sk->sk_family,
874 af_family_key_strings[sk->sk_family],
875 af_family_keys + sk->sk_family);
a5b5bb9a
IM		 876}
877
f1a6c4da
PE		 878static void sock_copy(struct sock *nsk, const struct sock *osk)
879{
880#ifdef CONFIG_SECURITY_NETWORK
881 void *sptr = nsk->sk_security;
882#endif
883
884 memcpy(nsk, osk, osk->sk_prot->obj_size);
f1a6c4da
PE		 885#ifdef CONFIG_SECURITY_NETWORK
886 nsk->sk_security = sptr;
887 security_sk_clone(osk, nsk);
888#endif
889}
890
2e4afe7b
PE		 891static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority,
892 int family)
c308c1b2
PE		 893{
894 struct sock *sk;
895 struct kmem_cache *slab;
896
897 slab = prot->slab;
898 if (slab != NULL)
899 sk = kmem_cache_alloc(slab, priority);
900 else
901 sk = kmalloc(prot->obj_size, priority);
902
2e4afe7b
PE		 903 if (sk != NULL) {
904 if (security_sk_alloc(sk, family, priority))
905 goto out_free;
906
907 if (!try_module_get(prot->owner))
908 goto out_free_sec;
909 }
910
c308c1b2 911 return sk;
2e4afe7b
PE		 912
913out_free_sec:
914 security_sk_free(sk);
915out_free:
916 if (slab != NULL)
917 kmem_cache_free(slab, sk);
918 else
919 kfree(sk);
920 return NULL;
c308c1b2
PE		 921}
922
923static void sk_prot_free(struct proto *prot, struct sock *sk)
924{
925 struct kmem_cache *slab;
2e4afe7b 926 struct module *owner;
c308c1b2 927
2e4afe7b 928 owner = prot->owner;
c308c1b2 929 slab = prot->slab;
2e4afe7b
PE		 930
931 security_sk_free(sk);
c308c1b2
PE		 932 if (slab != NULL)
933 kmem_cache_free(slab, sk);
934 else
935 kfree(sk);
2e4afe7b 936 module_put(owner);
c308c1b2
PE		 937}
938
1da177e4
LT		 939/**
940 * sk_alloc - All socket objects are allocated here
c4ea43c5 941 * @net: the applicable net namespace
4dc3b16b
PP		 942 * @family: protocol family
943 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
944 * @prot: struct proto associated with this new sock instance
945 * @zero_it: if we should zero the newly allocated sock
1da177e4 946 */
1b8d7ae4 947struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
6257ff21 948 struct proto *prot)
1da177e4 949{
c308c1b2 950 struct sock *sk;
1da177e4 951
154adbc8 952 sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family);
1da177e4 953 if (sk) {
154adbc8
PE		 954 sk->sk_family = family;
955 /*
956 * See comment in struct sock definition to understand
957 * why we need sk_prot_creator -acme
958 */
959 sk->sk_prot = sk->sk_prot_creator = prot;
960 sock_lock_init(sk);
3b1e0a65 961 sock_net_set(sk, get_net(net));
1da177e4 962 }
a79af59e 963
2e4afe7b 964 return sk;
1da177e4
LT		 965}
966
967void sk_free(struct sock *sk)
968{
969 struct sk_filter *filter;
1da177e4
LT		 970
971 if (sk->sk_destruct)
972 sk->sk_destruct(sk);
973
fda9ef5d 974 filter = rcu_dereference(sk->sk_filter);
1da177e4 975 if (filter) {
309dd5fc 976 sk_filter_uncharge(sk, filter);
fda9ef5d 977 rcu_assign_pointer(sk->sk_filter, NULL);
1da177e4
LT		 978 }
979
980 sock_disable_timestamp(sk);
981
982 if (atomic_read(&sk->sk_omem_alloc))
983 printk(KERN_DEBUG "%s: optmem leakage (%d bytes) detected.\n",
0dc47877 984 __func__, atomic_read(&sk->sk_omem_alloc));
1da177e4 985
3b1e0a65 986 put_net(sock_net(sk));
c308c1b2 987 sk_prot_free(sk->sk_prot_creator, sk);
1da177e4
LT		 988}
989
edf02087
DL		 990/*
991 * Last sock_put should drop referrence to sk->sk_net. It has already
992 * been dropped in sk_change_net. Taking referrence to stopping namespace
993 * is not an option.
994 * Take referrence to a socket to remove it from hash _alive_ and after that
995 * destroy it in the context of init_net.
996 */
997void sk_release_kernel(struct sock *sk)
998{
999 if (sk == NULL || sk->sk_socket == NULL)
1000 return;
1001
1002 sock_hold(sk);
1003 sock_release(sk->sk_socket);
3b1e0a65 1004 sock_net_set(sk, get_net(&init_net));
edf02087
DL		 1005 sock_put(sk);
1006}
45af1754 1007EXPORT_SYMBOL(sk_release_kernel);
edf02087 1008
dd0fc66f 1009struct sock *sk_clone(const struct sock *sk, const gfp_t priority)
87d11ceb 1010{
8fd1d178 1011 struct sock *newsk;
87d11ceb 1012
8fd1d178 1013 newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family);
87d11ceb
ACM		 1014 if (newsk != NULL) {
1015 struct sk_filter *filter;
1016
892c141e 1017 sock_copy(newsk, sk);
87d11ceb
ACM		 1018
1019 /* SANITY */
3b1e0a65 1020 get_net(sock_net(newsk));
87d11ceb
ACM		 1021 sk_node_init(&newsk->sk_node);
1022 sock_lock_init(newsk);
1023 bh_lock_sock(newsk);
fa438ccf 1024 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL;
87d11ceb
ACM		 1025
1026 atomic_set(&newsk->sk_rmem_alloc, 0);
1027 atomic_set(&newsk->sk_wmem_alloc, 0);
1028 atomic_set(&newsk->sk_omem_alloc, 0);
1029 skb_queue_head_init(&newsk->sk_receive_queue);
1030 skb_queue_head_init(&newsk->sk_write_queue);
97fc2f08
CL		 1031#ifdef CONFIG_NET_DMA
1032 skb_queue_head_init(&newsk->sk_async_wait_queue);
1033#endif
87d11ceb
ACM		 1034
1035 rwlock_init(&newsk->sk_dst_lock);
1036 rwlock_init(&newsk->sk_callback_lock);
443aef0e
PZ		 1037 lockdep_set_class_and_name(&newsk->sk_callback_lock,
1038 af_callback_keys + newsk->sk_family,
1039 af_family_clock_key_strings[newsk->sk_family]);
87d11ceb
ACM		 1040
1041 newsk->sk_dst_cache = NULL;
1042 newsk->sk_wmem_queued = 0;
1043 newsk->sk_forward_alloc = 0;
1044 newsk->sk_send_head = NULL;
87d11ceb
ACM		 1045 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
1046
1047 sock_reset_flag(newsk, SOCK_DONE);
1048 skb_queue_head_init(&newsk->sk_error_queue);
1049
1050 filter = newsk->sk_filter;
1051 if (filter != NULL)
1052 sk_filter_charge(newsk, filter);
1053
1054 if (unlikely(xfrm_sk_clone_policy(newsk))) {
1055 /* It is still raw copy of parent, so invalidate
1056 * destructor and make plain sk_free() */
1057 newsk->sk_destruct = NULL;
1058 sk_free(newsk);
1059 newsk = NULL;
1060 goto out;
1061 }
1062
1063 newsk->sk_err = 0;
1064 newsk->sk_priority = 0;
1065 atomic_set(&newsk->sk_refcnt, 2);
1066
1067 /*
1068 * Increment the counter in the same struct proto as the master
1069 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
1070 * is the same as sk->sk_prot->socks, as this field was copied
1071 * with memcpy).
1072 *
1073 * This _changes_ the previous behaviour, where
1074 * tcp_create_openreq_child always was incrementing the
1075 * equivalent to tcp_prot->socks (inet_sock_nr), so this have
1076 * to be taken into account in all callers. -acme
1077 */
1078 sk_refcnt_debug_inc(newsk);
1079 newsk->sk_socket = NULL;
1080 newsk->sk_sleep = NULL;
1081
1082 if (newsk->sk_prot->sockets_allocated)
1083 atomic_inc(newsk->sk_prot->sockets_allocated);
1084 }
1085out:
1086 return newsk;
1087}
1088
1089EXPORT_SYMBOL_GPL(sk_clone);
1090
9958089a
AK		 1091void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
1092{
1093 __sk_dst_set(sk, dst);
1094 sk->sk_route_caps = dst->dev->features;
1095 if (sk->sk_route_caps & NETIF_F_GSO)
4fcd6b99 1096 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE;
9958089a 1097 if (sk_can_gso(sk)) {
82cc1a7a 1098 if (dst->header_len) {
9958089a 1099 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
82cc1a7a 1100 } else {
9958089a 1101 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
82cc1a7a
PWJ		 1102 sk->sk_gso_max_size = dst->dev->gso_max_size;
1103 }
9958089a
AK		 1104 }
1105}
1106EXPORT_SYMBOL_GPL(sk_setup_caps);
1107
1da177e4
LT		 1108void __init sk_init(void)
1109{
1110 if (num_physpages <= 4096) {
1111 sysctl_wmem_max = 32767;
1112 sysctl_rmem_max = 32767;
1113 sysctl_wmem_default = 32767;
1114 sysctl_rmem_default = 32767;
1115 } else if (num_physpages >= 131072) {
1116 sysctl_wmem_max = 131071;
1117 sysctl_rmem_max = 131071;
1118 }
1119}
1120
1121/*
1122 * Simple resource managers for sockets.
1123 */
1124
1125
4ec93edb
YH		 1126/*
1127 * Write buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1128 */
1129void sock_wfree(struct sk_buff *skb)
1130{
1131 struct sock *sk = skb->sk;
1132
1133 /* In case it might be waiting for more memory. */
1134 atomic_sub(skb->truesize, &sk->sk_wmem_alloc);
1135 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE))
1136 sk->sk_write_space(sk);
1137 sock_put(sk);
1138}
1139
4ec93edb
YH		 1140/*
1141 * Read buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1142 */
1143void sock_rfree(struct sk_buff *skb)
1144{
1145 struct sock *sk = skb->sk;
1146
3ab224be 1147 skb_truesize_check(skb);
1da177e4 1148 atomic_sub(skb->truesize, &sk->sk_rmem_alloc);
3ab224be 1149 sk_mem_uncharge(skb->sk, skb->truesize);
1da177e4
LT		 1150}
1151
1152
1153int sock_i_uid(struct sock *sk)
1154{
1155 int uid;
1156
1157 read_lock(&sk->sk_callback_lock);
1158 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : 0;
1159 read_unlock(&sk->sk_callback_lock);
1160 return uid;
1161}
1162
1163unsigned long sock_i_ino(struct sock *sk)
1164{
1165 unsigned long ino;
1166
1167 read_lock(&sk->sk_callback_lock);
1168 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
1169 read_unlock(&sk->sk_callback_lock);
1170 return ino;
1171}
1172
1173/*
1174 * Allocate a skb from the socket's send buffer.
1175 */
86a76caf 1176struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
dd0fc66f 1177 gfp_t priority)
1da177e4
LT		 1178{
1179 if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
1180 struct sk_buff * skb = alloc_skb(size, priority);
1181 if (skb) {
1182 skb_set_owner_w(skb, sk);
1183 return skb;
1184 }
1185 }
1186 return NULL;
1187}
1188
1189/*
1190 * Allocate a skb from the socket's receive buffer.
4ec93edb 1191 */
86a76caf 1192struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force,
dd0fc66f 1193 gfp_t priority)
1da177e4
LT		 1194{
1195 if (force || atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) {
1196 struct sk_buff *skb = alloc_skb(size, priority);
1197 if (skb) {
1198 skb_set_owner_r(skb, sk);
1199 return skb;
1200 }
1201 }
1202 return NULL;
1203}
1204
4ec93edb 1205/*
1da177e4 1206 * Allocate a memory block from the socket's option memory buffer.
4ec93edb 1207 */
dd0fc66f 1208void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
1da177e4
LT		 1209{
1210 if ((unsigned)size <= sysctl_optmem_max &&
1211 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) {
1212 void *mem;
1213 /* First do the add, to avoid the race if kmalloc
4ec93edb 1214 * might sleep.
1da177e4
LT		 1215 */
1216 atomic_add(size, &sk->sk_omem_alloc);
1217 mem = kmalloc(size, priority);
1218 if (mem)
1219 return mem;
1220 atomic_sub(size, &sk->sk_omem_alloc);
1221 }
1222 return NULL;
1223}
1224
1225/*
1226 * Free an option memory block.
1227 */
1228void sock_kfree_s(struct sock *sk, void *mem, int size)
1229{
1230 kfree(mem);
1231 atomic_sub(size, &sk->sk_omem_alloc);
1232}
1233
1234/* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
1235 I think, these locks should be removed for datagram sockets.
1236 */
1237static long sock_wait_for_wmem(struct sock * sk, long timeo)
1238{
1239 DEFINE_WAIT(wait);
1240
1241 clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1242 for (;;) {
1243 if (!timeo)
1244 break;
1245 if (signal_pending(current))
1246 break;
1247 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1248 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
1249 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf)
1250 break;
1251 if (sk->sk_shutdown & SEND_SHUTDOWN)
1252 break;
1253 if (sk->sk_err)
1254 break;
1255 timeo = schedule_timeout(timeo);
1256 }
1257 finish_wait(sk->sk_sleep, &wait);
1258 return timeo;
1259}
1260
1261
1262/*
1263 * Generic send/receive buffer handlers
1264 */
1265
1266static struct sk_buff *sock_alloc_send_pskb(struct sock *sk,
1267 unsigned long header_len,
1268 unsigned long data_len,
1269 int noblock, int *errcode)
1270{
1271 struct sk_buff *skb;
7d877f3b 1272 gfp_t gfp_mask;
1da177e4
LT		 1273 long timeo;
1274 int err;
1275
1276 gfp_mask = sk->sk_allocation;
1277 if (gfp_mask & __GFP_WAIT)
1278 gfp_mask |= __GFP_REPEAT;
1279
1280 timeo = sock_sndtimeo(sk, noblock);
1281 while (1) {
1282 err = sock_error(sk);
1283 if (err != 0)
1284 goto failure;
1285
1286 err = -EPIPE;
1287 if (sk->sk_shutdown & SEND_SHUTDOWN)
1288 goto failure;
1289
1290 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
db38c179 1291 skb = alloc_skb(header_len, gfp_mask);
1da177e4
LT		 1292 if (skb) {
1293 int npages;
1294 int i;
1295
1296 /* No pages, we're done... */
1297 if (!data_len)
1298 break;
1299
1300 npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
1301 skb->truesize += data_len;
1302 skb_shinfo(skb)->nr_frags = npages;
1303 for (i = 0; i < npages; i++) {
1304 struct page *page;
1305 skb_frag_t *frag;
1306
1307 page = alloc_pages(sk->sk_allocation, 0);
1308 if (!page) {
1309 err = -ENOBUFS;
1310 skb_shinfo(skb)->nr_frags = i;
1311 kfree_skb(skb);
1312 goto failure;
1313 }
1314
1315 frag = &skb_shinfo(skb)->frags[i];
1316 frag->page = page;
1317 frag->page_offset = 0;
1318 frag->size = (data_len >= PAGE_SIZE ?
1319 PAGE_SIZE :
1320 data_len);
1321 data_len -= PAGE_SIZE;
1322 }
1323
1324 /* Full success... */
1325 break;
1326 }
1327 err = -ENOBUFS;
1328 goto failure;
1329 }
1330 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1331 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1332 err = -EAGAIN;
1333 if (!timeo)
1334 goto failure;
1335 if (signal_pending(current))
1336 goto interrupted;
1337 timeo = sock_wait_for_wmem(sk, timeo);
1338 }
1339
1340 skb_set_owner_w(skb, sk);
1341 return skb;
1342
1343interrupted:
1344 err = sock_intr_errno(timeo);
1345failure:
1346 *errcode = err;
1347 return NULL;
1348}
1349
4ec93edb 1350struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
1da177e4
LT		 1351 int noblock, int *errcode)
1352{
1353 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode);
1354}
1355
1356static void __lock_sock(struct sock *sk)
1357{
1358 DEFINE_WAIT(wait);
1359
e71a4783 1360 for (;;) {
1da177e4
LT		 1361 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
1362 TASK_UNINTERRUPTIBLE);
1363 spin_unlock_bh(&sk->sk_lock.slock);
1364 schedule();
1365 spin_lock_bh(&sk->sk_lock.slock);
e71a4783 1366 if (!sock_owned_by_user(sk))
1da177e4
LT		 1367 break;
1368 }
1369 finish_wait(&sk->sk_lock.wq, &wait);
1370}
1371
1372static void __release_sock(struct sock *sk)
1373{
1374 struct sk_buff *skb = sk->sk_backlog.head;
1375
1376 do {
1377 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
1378 bh_unlock_sock(sk);
1379
1380 do {
1381 struct sk_buff *next = skb->next;
1382
1383 skb->next = NULL;
1384 sk->sk_backlog_rcv(sk, skb);
1385
1386 /*
1387 * We are in process context here with softirqs
1388 * disabled, use cond_resched_softirq() to preempt.
1389 * This is safe to do because we've taken the backlog
1390 * queue private:
1391 */
1392 cond_resched_softirq();
1393
1394 skb = next;
1395 } while (skb != NULL);
1396
1397 bh_lock_sock(sk);
e71a4783 1398 } while ((skb = sk->sk_backlog.head) != NULL);
1da177e4
LT		 1399}
1400
1401/**
1402 * sk_wait_data - wait for data to arrive at sk_receive_queue
4dc3b16b
PP		 1403 * @sk: sock to wait on
1404 * @timeo: for how long
1da177e4
LT		 1405 *
1406 * Now socket state including sk->sk_err is changed only under lock,
1407 * hence we may omit checks after joining wait queue.
1408 * We check receive queue before schedule() only as optimization;
1409 * it is very likely that release_sock() added new data.
1410 */
1411int sk_wait_data(struct sock *sk, long *timeo)
1412{
1413 int rc;
1414 DEFINE_WAIT(wait);
1415
1416 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
1417 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1418 rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue));
1419 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1420 finish_wait(sk->sk_sleep, &wait);
1421 return rc;
1422}
1423
1424EXPORT_SYMBOL(sk_wait_data);
1425
3ab224be
HA		 1426/**
1427 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated
1428 * @sk: socket
1429 * @size: memory size to allocate
1430 * @kind: allocation type
1431 *
1432 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means
1433 * rmem allocation. This function assumes that protocols which have
1434 * memory_pressure use sk_wmem_queued as write buffer accounting.
1435 */
1436int __sk_mem_schedule(struct sock *sk, int size, int kind)
1437{
1438 struct proto *prot = sk->sk_prot;
1439 int amt = sk_mem_pages(size);
1440 int allocated;
1441
1442 sk->sk_forward_alloc += amt * SK_MEM_QUANTUM;
1443 allocated = atomic_add_return(amt, prot->memory_allocated);
1444
1445 /* Under limit. */
1446 if (allocated <= prot->sysctl_mem[0]) {
1447 if (prot->memory_pressure && *prot->memory_pressure)
1448 *prot->memory_pressure = 0;
1449 return 1;
1450 }
1451
1452 /* Under pressure. */
1453 if (allocated > prot->sysctl_mem[1])
1454 if (prot->enter_memory_pressure)
1455 prot->enter_memory_pressure();
1456
1457 /* Over hard limit. */
1458 if (allocated > prot->sysctl_mem[2])
1459 goto suppress_allocation;
1460
1461 /* guarantee minimum buffer size under pressure */
1462 if (kind == SK_MEM_RECV) {
1463 if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0])
1464 return 1;
1465 } else { /* SK_MEM_SEND */
1466 if (sk->sk_type == SOCK_STREAM) {
1467 if (sk->sk_wmem_queued < prot->sysctl_wmem[0])
1468 return 1;
1469 } else if (atomic_read(&sk->sk_wmem_alloc) <
1470 prot->sysctl_wmem[0])
1471 return 1;
1472 }
1473
1474 if (prot->memory_pressure) {
1475 if (!*prot->memory_pressure ||
1476 prot->sysctl_mem[2] > atomic_read(prot->sockets_allocated) *
1477 sk_mem_pages(sk->sk_wmem_queued +
1478 atomic_read(&sk->sk_rmem_alloc) +
1479 sk->sk_forward_alloc))
1480 return 1;
1481 }
1482
1483suppress_allocation:
1484
1485 if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) {
1486 sk_stream_moderate_sndbuf(sk);
1487
1488 /* Fail only if socket is _under_ its sndbuf.
1489 * In this case we cannot block, so that we have to fail.
1490 */
1491 if (sk->sk_wmem_queued + size >= sk->sk_sndbuf)
1492 return 1;
1493 }
1494
1495 /* Alas. Undo changes. */
1496 sk->sk_forward_alloc -= amt * SK_MEM_QUANTUM;
1497 atomic_sub(amt, prot->memory_allocated);
1498 return 0;
1499}
1500
1501EXPORT_SYMBOL(__sk_mem_schedule);
1502
1503/**
1504 * __sk_reclaim - reclaim memory_allocated
1505 * @sk: socket
1506 */
1507void __sk_mem_reclaim(struct sock *sk)
1508{
1509 struct proto *prot = sk->sk_prot;
1510
680a5a50 1511 atomic_sub(sk->sk_forward_alloc >> SK_MEM_QUANTUM_SHIFT,
3ab224be
HA		 1512 prot->memory_allocated);
1513 sk->sk_forward_alloc &= SK_MEM_QUANTUM - 1;
1514
1515 if (prot->memory_pressure && *prot->memory_pressure &&
1516 (atomic_read(prot->memory_allocated) < prot->sysctl_mem[0]))
1517 *prot->memory_pressure = 0;
1518}
1519
1520EXPORT_SYMBOL(__sk_mem_reclaim);
1521
1522
1da177e4
LT		 1523/*
1524 * Set of default routines for initialising struct proto_ops when
1525 * the protocol does not support a particular function. In certain
1526 * cases where it makes no sense for a protocol to have a "do nothing"
1527 * function, some default processing is provided.
1528 */
1529
1530int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
1531{
1532 return -EOPNOTSUPP;
1533}
1534
4ec93edb 1535int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 1536 int len, int flags)
1537{
1538 return -EOPNOTSUPP;
1539}
1540
1541int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
1542{
1543 return -EOPNOTSUPP;
1544}
1545
1546int sock_no_accept(struct socket *sock, struct socket *newsock, int flags)
1547{
1548 return -EOPNOTSUPP;
1549}
1550
4ec93edb 1551int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 1552 int *len, int peer)
1553{
1554 return -EOPNOTSUPP;
1555}
1556
1557unsigned int sock_no_poll(struct file * file, struct socket *sock, poll_table *pt)
1558{
1559 return 0;
1560}
1561
1562int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1563{
1564 return -EOPNOTSUPP;
1565}
1566
1567int sock_no_listen(struct socket *sock, int backlog)
1568{
1569 return -EOPNOTSUPP;
1570}
1571
1572int sock_no_shutdown(struct socket *sock, int how)
1573{
1574 return -EOPNOTSUPP;
1575}
1576
1577int sock_no_setsockopt(struct socket *sock, int level, int optname,
1578 char __user *optval, int optlen)
1579{
1580 return -EOPNOTSUPP;
1581}
1582
1583int sock_no_getsockopt(struct socket *sock, int level, int optname,
1584 char __user *optval, int __user *optlen)
1585{
1586 return -EOPNOTSUPP;
1587}
1588
1589int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
1590 size_t len)
1591{
1592 return -EOPNOTSUPP;
1593}
1594
1595int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
1596 size_t len, int flags)
1597{
1598 return -EOPNOTSUPP;
1599}
1600
1601int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
1602{
1603 /* Mirror missing mmap method error code */
1604 return -ENODEV;
1605}
1606
1607ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
1608{
1609 ssize_t res;
1610 struct msghdr msg = {.msg_flags = flags};
1611 struct kvec iov;
1612 char *kaddr = kmap(page);
1613 iov.iov_base = kaddr + offset;
1614 iov.iov_len = size;
1615 res = kernel_sendmsg(sock, &msg, &iov, 1, size);
1616 kunmap(page);
1617 return res;
1618}
1619
1620/*
1621 * Default Socket Callbacks
1622 */
1623
1624static void sock_def_wakeup(struct sock *sk)
1625{
1626 read_lock(&sk->sk_callback_lock);
1627 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
1628 wake_up_interruptible_all(sk->sk_sleep);
1629 read_unlock(&sk->sk_callback_lock);
1630}
1631
1632static void sock_def_error_report(struct sock *sk)
1633{
1634 read_lock(&sk->sk_callback_lock);
1635 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
1636 wake_up_interruptible(sk->sk_sleep);
8d8ad9d7 1637 sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR);
1da177e4
LT		 1638 read_unlock(&sk->sk_callback_lock);
1639}
1640
1641static void sock_def_readable(struct sock *sk, int len)
1642{
1643 read_lock(&sk->sk_callback_lock);
1644 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
1645 wake_up_interruptible(sk->sk_sleep);
8d8ad9d7 1646 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
1da177e4
LT		 1647 read_unlock(&sk->sk_callback_lock);
1648}
1649
1650static void sock_def_write_space(struct sock *sk)
1651{
1652 read_lock(&sk->sk_callback_lock);
1653
1654 /* Do not wake up a writer until he can make "significant"
1655 * progress. --DaveM
1656 */
e71a4783 1657 if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) {
1da177e4
LT		 1658 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
1659 wake_up_interruptible(sk->sk_sleep);
1660
1661 /* Should agree with poll, otherwise some programs break */
1662 if (sock_writeable(sk))
8d8ad9d7 1663 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
1da177e4
LT		 1664 }
1665
1666 read_unlock(&sk->sk_callback_lock);
1667}
1668
1669static void sock_def_destruct(struct sock *sk)
1670{
a51482bd 1671 kfree(sk->sk_protinfo);
1da177e4
LT		 1672}
1673
1674void sk_send_sigurg(struct sock *sk)
1675{
1676 if (sk->sk_socket && sk->sk_socket->file)
1677 if (send_sigurg(&sk->sk_socket->file->f_owner))
8d8ad9d7 1678 sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI);
1da177e4
LT		 1679}
1680
1681void sk_reset_timer(struct sock *sk, struct timer_list* timer,
1682 unsigned long expires)
1683{
1684 if (!mod_timer(timer, expires))
1685 sock_hold(sk);
1686}
1687
1688EXPORT_SYMBOL(sk_reset_timer);
1689
1690void sk_stop_timer(struct sock *sk, struct timer_list* timer)
1691{
1692 if (timer_pending(timer) && del_timer(timer))
1693 __sock_put(sk);
1694}
1695
1696EXPORT_SYMBOL(sk_stop_timer);
1697
1698void sock_init_data(struct socket *sock, struct sock *sk)
1699{
1700 skb_queue_head_init(&sk->sk_receive_queue);
1701 skb_queue_head_init(&sk->sk_write_queue);
1702 skb_queue_head_init(&sk->sk_error_queue);
97fc2f08
CL		 1703#ifdef CONFIG_NET_DMA
1704 skb_queue_head_init(&sk->sk_async_wait_queue);
1705#endif
1da177e4
LT		 1706
1707 sk->sk_send_head = NULL;
1708
1709 init_timer(&sk->sk_timer);
4ec93edb 1710
1da177e4
LT		 1711 sk->sk_allocation = GFP_KERNEL;
1712 sk->sk_rcvbuf = sysctl_rmem_default;
1713 sk->sk_sndbuf = sysctl_wmem_default;
1714 sk->sk_state = TCP_CLOSE;
1715 sk->sk_socket = sock;
1716
1717 sock_set_flag(sk, SOCK_ZAPPED);
1718
e71a4783 1719 if (sock) {
1da177e4
LT		 1720 sk->sk_type = sock->type;
1721 sk->sk_sleep = &sock->wait;
1722 sock->sk = sk;
1723 } else
1724 sk->sk_sleep = NULL;
1725
1726 rwlock_init(&sk->sk_dst_lock);
1727 rwlock_init(&sk->sk_callback_lock);
443aef0e
PZ		 1728 lockdep_set_class_and_name(&sk->sk_callback_lock,
1729 af_callback_keys + sk->sk_family,
1730 af_family_clock_key_strings[sk->sk_family]);
1da177e4
LT		 1731
1732 sk->sk_state_change = sock_def_wakeup;
1733 sk->sk_data_ready = sock_def_readable;
1734 sk->sk_write_space = sock_def_write_space;
1735 sk->sk_error_report = sock_def_error_report;
1736 sk->sk_destruct = sock_def_destruct;
1737
1738 sk->sk_sndmsg_page = NULL;
1739 sk->sk_sndmsg_off = 0;
1740
1741 sk->sk_peercred.pid = 0;
1742 sk->sk_peercred.uid = -1;
1743 sk->sk_peercred.gid = -1;
1744 sk->sk_write_pending = 0;
1745 sk->sk_rcvlowat = 1;
1746 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
1747 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
1748
b7aa0bf7 1749 sk->sk_stamp = ktime_set(-1L, -1L);
1da177e4
LT		 1750
1751 atomic_set(&sk->sk_refcnt, 1);
33c732c3 1752 atomic_set(&sk->sk_drops, 0);
1da177e4
LT		 1753}
1754
b5606c2d 1755void lock_sock_nested(struct sock *sk, int subclass)
1da177e4
LT		 1756{
1757 might_sleep();
a5b5bb9a 1758 spin_lock_bh(&sk->sk_lock.slock);
d2e9117c 1759 if (sk->sk_lock.owned)
1da177e4 1760 __lock_sock(sk);
d2e9117c 1761 sk->sk_lock.owned = 1;
a5b5bb9a
IM		 1762 spin_unlock(&sk->sk_lock.slock);
1763 /*
1764 * The sk_lock has mutex_lock() semantics here:
1765 */
fcc70d5f 1766 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
a5b5bb9a 1767 local_bh_enable();
1da177e4
LT		 1768}
1769
fcc70d5f 1770EXPORT_SYMBOL(lock_sock_nested);
1da177e4 1771
b5606c2d 1772void release_sock(struct sock *sk)
1da177e4 1773{
a5b5bb9a
IM		 1774 /*
1775 * The sk_lock has mutex_unlock() semantics:
1776 */
1777 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
1778
1779 spin_lock_bh(&sk->sk_lock.slock);
1da177e4
LT		 1780 if (sk->sk_backlog.tail)
1781 __release_sock(sk);
d2e9117c 1782 sk->sk_lock.owned = 0;
a5b5bb9a
IM		 1783 if (waitqueue_active(&sk->sk_lock.wq))
1784 wake_up(&sk->sk_lock.wq);
1785 spin_unlock_bh(&sk->sk_lock.slock);
1da177e4
LT		 1786}
1787EXPORT_SYMBOL(release_sock);
1788
1789int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
4ec93edb 1790{
b7aa0bf7 1791 struct timeval tv;
1da177e4
LT		 1792 if (!sock_flag(sk, SOCK_TIMESTAMP))
1793 sock_enable_timestamp(sk);
b7aa0bf7
ED		 1794 tv = ktime_to_timeval(sk->sk_stamp);
1795 if (tv.tv_sec == -1)
1da177e4 1796 return -ENOENT;
b7aa0bf7
ED		 1797 if (tv.tv_sec == 0) {
1798 sk->sk_stamp = ktime_get_real();
1799 tv = ktime_to_timeval(sk->sk_stamp);
1800 }
1801 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0;
4ec93edb 1802}
1da177e4
LT		 1803EXPORT_SYMBOL(sock_get_timestamp);
1804
ae40eb1e
ED		 1805int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
1806{
1807 struct timespec ts;
1808 if (!sock_flag(sk, SOCK_TIMESTAMP))
1809 sock_enable_timestamp(sk);
1810 ts = ktime_to_timespec(sk->sk_stamp);
1811 if (ts.tv_sec == -1)
1812 return -ENOENT;
1813 if (ts.tv_sec == 0) {
1814 sk->sk_stamp = ktime_get_real();
1815 ts = ktime_to_timespec(sk->sk_stamp);
1816 }
1817 return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0;
1818}
1819EXPORT_SYMBOL(sock_get_timestampns);
1820
1da177e4 1821void sock_enable_timestamp(struct sock *sk)
4ec93edb
YH		 1822{
1823 if (!sock_flag(sk, SOCK_TIMESTAMP)) {
1da177e4
LT		 1824 sock_set_flag(sk, SOCK_TIMESTAMP);
1825 net_enable_timestamp();
1826 }
1827}
1da177e4
LT		 1828
1829/*
1830 * Get a socket option on an socket.
1831 *
1832 * FIX: POSIX 1003.1g is very ambiguous here. It states that
1833 * asynchronous errors should be reported by getsockopt. We assume
1834 * this means if you specify SO_ERROR (otherwise whats the point of it).
1835 */
1836int sock_common_getsockopt(struct socket *sock, int level, int optname,
1837 char __user *optval, int __user *optlen)
1838{
1839 struct sock *sk = sock->sk;
1840
1841 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
1842}
1843
1844EXPORT_SYMBOL(sock_common_getsockopt);
1845
3fdadf7d 1846#ifdef CONFIG_COMPAT
543d9cfe
ACM		 1847int compat_sock_common_getsockopt(struct socket *sock, int level, int optname,
1848 char __user *optval, int __user *optlen)
3fdadf7d
DM		 1849{
1850 struct sock *sk = sock->sk;
1851
1e51f951 1852 if (sk->sk_prot->compat_getsockopt != NULL)
543d9cfe
ACM		 1853 return sk->sk_prot->compat_getsockopt(sk, level, optname,
1854 optval, optlen);
3fdadf7d
DM		 1855 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
1856}
1857EXPORT_SYMBOL(compat_sock_common_getsockopt);
1858#endif
1859
1da177e4
LT		 1860int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock,
1861 struct msghdr *msg, size_t size, int flags)
1862{
1863 struct sock *sk = sock->sk;
1864 int addr_len = 0;
1865 int err;
1866
1867 err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT,
1868 flags & ~MSG_DONTWAIT, &addr_len);
1869 if (err >= 0)
1870 msg->msg_namelen = addr_len;
1871 return err;
1872}
1873
1874EXPORT_SYMBOL(sock_common_recvmsg);
1875
1876/*
1877 * Set socket options on an inet socket.
1878 */
1879int sock_common_setsockopt(struct socket *sock, int level, int optname,
1880 char __user *optval, int optlen)
1881{
1882 struct sock *sk = sock->sk;
1883
1884 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
1885}
1886
1887EXPORT_SYMBOL(sock_common_setsockopt);
1888
3fdadf7d 1889#ifdef CONFIG_COMPAT
543d9cfe
ACM		 1890int compat_sock_common_setsockopt(struct socket *sock, int level, int optname,
1891 char __user *optval, int optlen)
3fdadf7d
DM		 1892{
1893 struct sock *sk = sock->sk;
1894
543d9cfe
ACM		 1895 if (sk->sk_prot->compat_setsockopt != NULL)
1896 return sk->sk_prot->compat_setsockopt(sk, level, optname,
1897 optval, optlen);
3fdadf7d
DM		 1898 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
1899}
1900EXPORT_SYMBOL(compat_sock_common_setsockopt);
1901#endif
1902
1da177e4
LT		 1903void sk_common_release(struct sock *sk)
1904{
1905 if (sk->sk_prot->destroy)
1906 sk->sk_prot->destroy(sk);
1907
1908 /*
1909 * Observation: when sock_common_release is called, processes have
1910 * no access to socket. But net still has.
1911 * Step one, detach it from networking:
1912 *
1913 * A. Remove from hash tables.
1914 */
1915
1916 sk->sk_prot->unhash(sk);
1917
1918 /*
1919 * In this point socket cannot receive new packets, but it is possible
1920 * that some packets are in flight because some CPU runs receiver and
1921 * did hash table lookup before we unhashed socket. They will achieve
1922 * receive queue and will be purged by socket destructor.
1923 *
1924 * Also we still have packets pending on receive queue and probably,
1925 * our own packets waiting in device queues. sock_destroy will drain
1926 * receive queue, but transmitted packets will delay socket destruction
1927 * until the last reference will be released.
1928 */
1929
1930 sock_orphan(sk);
1931
1932 xfrm_sk_free_policy(sk);
1933
e6848976 1934 sk_refcnt_debug_release(sk);
1da177e4
LT		 1935 sock_put(sk);
1936}
1937
1938EXPORT_SYMBOL(sk_common_release);
1939
1940static DEFINE_RWLOCK(proto_list_lock);
1941static LIST_HEAD(proto_list);
1942
b733c007
PE		 1943int proto_register(struct proto *prot, int alloc_slab)
1944{
1945 char *request_sock_slab_name = NULL;
1946 char *timewait_sock_slab_name;
1947
65f76517 1948 if (sock_prot_inuse_init(prot) != 0) {
ebb53d75 1949 printk(KERN_CRIT "%s: Can't alloc inuse counters!\n", prot->name);
b733c007 1950 goto out;
ebb53d75 1951 }
b733c007 1952
1da177e4
LT		 1953 if (alloc_slab) {
1954 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0,
20c2df83 1955 SLAB_HWCACHE_ALIGN, NULL);
1da177e4
LT		 1956
1957 if (prot->slab == NULL) {
1958 printk(KERN_CRIT "%s: Can't create sock SLAB cache!\n",
1959 prot->name);
286ab3d4 1960 goto out_free_inuse;
1da177e4 1961 }
2e6599cb
ACM		 1962
1963 if (prot->rsk_prot != NULL) {
1964 static const char mask[] = "request_sock_%s";
1965
1966 request_sock_slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL);
1967 if (request_sock_slab_name == NULL)
1968 goto out_free_sock_slab;
1969
1970 sprintf(request_sock_slab_name, mask, prot->name);
1971 prot->rsk_prot->slab = kmem_cache_create(request_sock_slab_name,
1972 prot->rsk_prot->obj_size, 0,
20c2df83 1973 SLAB_HWCACHE_ALIGN, NULL);
2e6599cb
ACM		 1974
1975 if (prot->rsk_prot->slab == NULL) {
1976 printk(KERN_CRIT "%s: Can't create request sock SLAB cache!\n",
1977 prot->name);
1978 goto out_free_request_sock_slab_name;
1979 }
1980 }
8feaf0c0 1981
6d6ee43e 1982 if (prot->twsk_prot != NULL) {
8feaf0c0
ACM		 1983 static const char mask[] = "tw_sock_%s";
1984
1985 timewait_sock_slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL);
1986
1987 if (timewait_sock_slab_name == NULL)
1988 goto out_free_request_sock_slab;
1989
1990 sprintf(timewait_sock_slab_name, mask, prot->name);
6d6ee43e
ACM		 1991 prot->twsk_prot->twsk_slab =
1992 kmem_cache_create(timewait_sock_slab_name,
1993 prot->twsk_prot->twsk_obj_size,
1994 0, SLAB_HWCACHE_ALIGN,
20c2df83 1995 NULL);
6d6ee43e 1996 if (prot->twsk_prot->twsk_slab == NULL)
8feaf0c0
ACM		 1997 goto out_free_timewait_sock_slab_name;
1998 }
1da177e4
LT		 1999 }
2000
2a278051 2001 write_lock(&proto_list_lock);
1da177e4 2002 list_add(&prot->node, &proto_list);
1da177e4 2003 write_unlock(&proto_list_lock);
b733c007
PE		 2004 return 0;
2005
8feaf0c0
ACM		 2006out_free_timewait_sock_slab_name:
2007 kfree(timewait_sock_slab_name);
2008out_free_request_sock_slab:
2009 if (prot->rsk_prot && prot->rsk_prot->slab) {
2010 kmem_cache_destroy(prot->rsk_prot->slab);
2011 prot->rsk_prot->slab = NULL;
2012 }
2e6599cb
ACM		 2013out_free_request_sock_slab_name:
2014 kfree(request_sock_slab_name);
2015out_free_sock_slab:
2016 kmem_cache_destroy(prot->slab);
2017 prot->slab = NULL;
286ab3d4 2018out_free_inuse:
65f76517 2019 sock_prot_inuse_free(prot);
b733c007
PE		 2020out:
2021 return -ENOBUFS;
1da177e4
LT		 2022}
2023
2024EXPORT_SYMBOL(proto_register);
2025
2026void proto_unregister(struct proto *prot)
2027{
2028 write_lock(&proto_list_lock);
0a3f4358
PM		 2029 list_del(&prot->node);
2030 write_unlock(&proto_list_lock);
1da177e4 2031
65f76517 2032 sock_prot_inuse_free(prot);
ebb53d75 2033
1da177e4
LT		 2034 if (prot->slab != NULL) {
2035 kmem_cache_destroy(prot->slab);
2036 prot->slab = NULL;
2037 }
2038
2e6599cb
ACM		 2039 if (prot->rsk_prot != NULL && prot->rsk_prot->slab != NULL) {
2040 const char *name = kmem_cache_name(prot->rsk_prot->slab);
2041
2042 kmem_cache_destroy(prot->rsk_prot->slab);
2043 kfree(name);
2044 prot->rsk_prot->slab = NULL;
2045 }
2046
6d6ee43e
ACM		 2047 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) {
2048 const char *name = kmem_cache_name(prot->twsk_prot->twsk_slab);
8feaf0c0 2049
6d6ee43e 2050 kmem_cache_destroy(prot->twsk_prot->twsk_slab);
8feaf0c0 2051 kfree(name);
6d6ee43e 2052 prot->twsk_prot->twsk_slab = NULL;
8feaf0c0 2053 }
1da177e4
LT		 2054}
2055
2056EXPORT_SYMBOL(proto_unregister);
2057
2058#ifdef CONFIG_PROC_FS
1da177e4 2059static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
9a429c49 2060 __acquires(proto_list_lock)
1da177e4
LT		 2061{
2062 read_lock(&proto_list_lock);
60f0438a 2063 return seq_list_start_head(&proto_list, *pos);
1da177e4
LT		 2064}
2065
2066static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2067{
60f0438a 2068 return seq_list_next(v, &proto_list, pos);
1da177e4
LT		 2069}
2070
2071static void proto_seq_stop(struct seq_file *seq, void *v)
9a429c49 2072 __releases(proto_list_lock)
1da177e4
LT		 2073{
2074 read_unlock(&proto_list_lock);
2075}
2076
2077static char proto_method_implemented(const void *method)
2078{
2079 return method == NULL ? 'n' : 'y';
2080}
2081
2082static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
2083{
2084 seq_printf(seq, "%-9s %4u %6d %6d %-3s %6u %-3s %-10s "
2085 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
2086 proto->name,
2087 proto->obj_size,
2088 proto->sockets_allocated != NULL ? atomic_read(proto->sockets_allocated) : -1,
2089 proto->memory_allocated != NULL ? atomic_read(proto->memory_allocated) : -1,
2090 proto->memory_pressure != NULL ? *proto->memory_pressure ? "yes" : "no" : "NI",
2091 proto->max_header,
2092 proto->slab == NULL ? "no" : "yes",
2093 module_name(proto->owner),
2094 proto_method_implemented(proto->close),
2095 proto_method_implemented(proto->connect),
2096 proto_method_implemented(proto->disconnect),
2097 proto_method_implemented(proto->accept),
2098 proto_method_implemented(proto->ioctl),
2099 proto_method_implemented(proto->init),
2100 proto_method_implemented(proto->destroy),
2101 proto_method_implemented(proto->shutdown),
2102 proto_method_implemented(proto->setsockopt),
2103 proto_method_implemented(proto->getsockopt),
2104 proto_method_implemented(proto->sendmsg),
2105 proto_method_implemented(proto->recvmsg),
2106 proto_method_implemented(proto->sendpage),
2107 proto_method_implemented(proto->bind),
2108 proto_method_implemented(proto->backlog_rcv),
2109 proto_method_implemented(proto->hash),
2110 proto_method_implemented(proto->unhash),
2111 proto_method_implemented(proto->get_port),
2112 proto_method_implemented(proto->enter_memory_pressure));
2113}
2114
2115static int proto_seq_show(struct seq_file *seq, void *v)
2116{
60f0438a 2117 if (v == &proto_list)
1da177e4
LT		 2118 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
2119 "protocol",
2120 "size",
2121 "sockets",
2122 "memory",
2123 "press",
2124 "maxhdr",
2125 "slab",
2126 "module",
2127 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
2128 else
60f0438a 2129 proto_seq_printf(seq, list_entry(v, struct proto, node));
1da177e4
LT		 2130 return 0;
2131}
2132
f690808e 2133static const struct seq_operations proto_seq_ops = {
1da177e4
LT		 2134 .start = proto_seq_start,
2135 .next = proto_seq_next,
2136 .stop = proto_seq_stop,
2137 .show = proto_seq_show,
2138};
2139
2140static int proto_seq_open(struct inode *inode, struct file *file)
2141{
2142 return seq_open(file, &proto_seq_ops);
2143}
2144
9a32144e 2145static const struct file_operations proto_seq_fops = {
1da177e4
LT		 2146 .owner = THIS_MODULE,
2147 .open = proto_seq_open,
2148 .read = seq_read,
2149 .llseek = seq_lseek,
2150 .release = seq_release,
2151};
2152
2153static int __init proto_init(void)
2154{
2155 /* register /proc/net/protocols */
457c4cbc 2156 return proc_net_fops_create(&init_net, "protocols", S_IRUGO, &proto_seq_fops) == NULL ? -ENOBUFS : 0;
1da177e4
LT		 2157}
2158
2159subsys_initcall(proto_init);
2160
2161#endif /* PROC_FS */
2162
2163EXPORT_SYMBOL(sk_alloc);
2164EXPORT_SYMBOL(sk_free);
2165EXPORT_SYMBOL(sk_send_sigurg);
2166EXPORT_SYMBOL(sock_alloc_send_skb);
2167EXPORT_SYMBOL(sock_init_data);
2168EXPORT_SYMBOL(sock_kfree_s);
2169EXPORT_SYMBOL(sock_kmalloc);
2170EXPORT_SYMBOL(sock_no_accept);
2171EXPORT_SYMBOL(sock_no_bind);
2172EXPORT_SYMBOL(sock_no_connect);
2173EXPORT_SYMBOL(sock_no_getname);
2174EXPORT_SYMBOL(sock_no_getsockopt);
2175EXPORT_SYMBOL(sock_no_ioctl);
2176EXPORT_SYMBOL(sock_no_listen);
2177EXPORT_SYMBOL(sock_no_mmap);
2178EXPORT_SYMBOL(sock_no_poll);
2179EXPORT_SYMBOL(sock_no_recvmsg);
2180EXPORT_SYMBOL(sock_no_sendmsg);
2181EXPORT_SYMBOL(sock_no_sendpage);
2182EXPORT_SYMBOL(sock_no_setsockopt);
2183EXPORT_SYMBOL(sock_no_shutdown);
2184EXPORT_SYMBOL(sock_no_socketpair);
2185EXPORT_SYMBOL(sock_rfree);
2186EXPORT_SYMBOL(sock_setsockopt);
2187EXPORT_SYMBOL(sock_wfree);
2188EXPORT_SYMBOL(sock_wmalloc);
2189EXPORT_SYMBOL(sock_i_uid);
2190EXPORT_SYMBOL(sock_i_ino);
1da177e4 2191EXPORT_SYMBOL(sysctl_optmem_max);
kernel source for telekom puls (alcatel/mediatek)