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remove final fastcall users
[net-next-2.6.git] / net / core / sock.c
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1da177e4
LT		 1/*
2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
5 *
6 * Generic socket support routines. Memory allocators, socket lock/release
7 * handler for protocols to use and generic option handler.
8 *
9 *
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;
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);
961 sk->sk_net = 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",
984 __FUNCTION__, atomic_read(&sk->sk_omem_alloc));
985
1b8d7ae4 986 put_net(sk->sk_net);
c308c1b2 987 sk_prot_free(sk->sk_prot_creator, sk);
1da177e4
LT		 988}
989
dd0fc66f 990struct sock *sk_clone(const struct sock *sk, const gfp_t priority)
87d11ceb 991{
8fd1d178 992 struct sock *newsk;
87d11ceb 993
8fd1d178 994 newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family);
87d11ceb
ACM		 995 if (newsk != NULL) {
996 struct sk_filter *filter;
997
892c141e 998 sock_copy(newsk, sk);
87d11ceb
ACM		 999
1000 /* SANITY */
1e2e6b89 1001 get_net(newsk->sk_net);
87d11ceb
ACM		 1002 sk_node_init(&newsk->sk_node);
1003 sock_lock_init(newsk);
1004 bh_lock_sock(newsk);
fa438ccf 1005 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL;
87d11ceb
ACM		 1006
1007 atomic_set(&newsk->sk_rmem_alloc, 0);
1008 atomic_set(&newsk->sk_wmem_alloc, 0);
1009 atomic_set(&newsk->sk_omem_alloc, 0);
1010 skb_queue_head_init(&newsk->sk_receive_queue);
1011 skb_queue_head_init(&newsk->sk_write_queue);
97fc2f08
CL		 1012#ifdef CONFIG_NET_DMA
1013 skb_queue_head_init(&newsk->sk_async_wait_queue);
1014#endif
87d11ceb
ACM		 1015
1016 rwlock_init(&newsk->sk_dst_lock);
1017 rwlock_init(&newsk->sk_callback_lock);
443aef0e
PZ		 1018 lockdep_set_class_and_name(&newsk->sk_callback_lock,
1019 af_callback_keys + newsk->sk_family,
1020 af_family_clock_key_strings[newsk->sk_family]);
87d11ceb
ACM		 1021
1022 newsk->sk_dst_cache = NULL;
1023 newsk->sk_wmem_queued = 0;
1024 newsk->sk_forward_alloc = 0;
1025 newsk->sk_send_head = NULL;
87d11ceb
ACM		 1026 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
1027
1028 sock_reset_flag(newsk, SOCK_DONE);
1029 skb_queue_head_init(&newsk->sk_error_queue);
1030
1031 filter = newsk->sk_filter;
1032 if (filter != NULL)
1033 sk_filter_charge(newsk, filter);
1034
1035 if (unlikely(xfrm_sk_clone_policy(newsk))) {
1036 /* It is still raw copy of parent, so invalidate
1037 * destructor and make plain sk_free() */
1038 newsk->sk_destruct = NULL;
1039 sk_free(newsk);
1040 newsk = NULL;
1041 goto out;
1042 }
1043
1044 newsk->sk_err = 0;
1045 newsk->sk_priority = 0;
1046 atomic_set(&newsk->sk_refcnt, 2);
1047
1048 /*
1049 * Increment the counter in the same struct proto as the master
1050 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
1051 * is the same as sk->sk_prot->socks, as this field was copied
1052 * with memcpy).
1053 *
1054 * This _changes_ the previous behaviour, where
1055 * tcp_create_openreq_child always was incrementing the
1056 * equivalent to tcp_prot->socks (inet_sock_nr), so this have
1057 * to be taken into account in all callers. -acme
1058 */
1059 sk_refcnt_debug_inc(newsk);
1060 newsk->sk_socket = NULL;
1061 newsk->sk_sleep = NULL;
1062
1063 if (newsk->sk_prot->sockets_allocated)
1064 atomic_inc(newsk->sk_prot->sockets_allocated);
1065 }
1066out:
1067 return newsk;
1068}
1069
1070EXPORT_SYMBOL_GPL(sk_clone);
1071
9958089a
AK		 1072void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
1073{
1074 __sk_dst_set(sk, dst);
1075 sk->sk_route_caps = dst->dev->features;
1076 if (sk->sk_route_caps & NETIF_F_GSO)
4fcd6b99 1077 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE;
9958089a
AK		 1078 if (sk_can_gso(sk)) {
1079 if (dst->header_len)
1080 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
1081 else
1082 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
1083 }
1084}
1085EXPORT_SYMBOL_GPL(sk_setup_caps);
1086
1da177e4
LT		 1087void __init sk_init(void)
1088{
1089 if (num_physpages <= 4096) {
1090 sysctl_wmem_max = 32767;
1091 sysctl_rmem_max = 32767;
1092 sysctl_wmem_default = 32767;
1093 sysctl_rmem_default = 32767;
1094 } else if (num_physpages >= 131072) {
1095 sysctl_wmem_max = 131071;
1096 sysctl_rmem_max = 131071;
1097 }
1098}
1099
1100/*
1101 * Simple resource managers for sockets.
1102 */
1103
1104
4ec93edb
YH		 1105/*
1106 * Write buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1107 */
1108void sock_wfree(struct sk_buff *skb)
1109{
1110 struct sock *sk = skb->sk;
1111
1112 /* In case it might be waiting for more memory. */
1113 atomic_sub(skb->truesize, &sk->sk_wmem_alloc);
1114 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE))
1115 sk->sk_write_space(sk);
1116 sock_put(sk);
1117}
1118
4ec93edb
YH		 1119/*
1120 * Read buffer destructor automatically called from kfree_skb.
1da177e4
LT		 1121 */
1122void sock_rfree(struct sk_buff *skb)
1123{
1124 struct sock *sk = skb->sk;
1125
3ab224be 1126 skb_truesize_check(skb);
1da177e4 1127 atomic_sub(skb->truesize, &sk->sk_rmem_alloc);
3ab224be 1128 sk_mem_uncharge(skb->sk, skb->truesize);
1da177e4
LT		 1129}
1130
1131
1132int sock_i_uid(struct sock *sk)
1133{
1134 int uid;
1135
1136 read_lock(&sk->sk_callback_lock);
1137 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : 0;
1138 read_unlock(&sk->sk_callback_lock);
1139 return uid;
1140}
1141
1142unsigned long sock_i_ino(struct sock *sk)
1143{
1144 unsigned long ino;
1145
1146 read_lock(&sk->sk_callback_lock);
1147 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
1148 read_unlock(&sk->sk_callback_lock);
1149 return ino;
1150}
1151
1152/*
1153 * Allocate a skb from the socket's send buffer.
1154 */
86a76caf 1155struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
dd0fc66f 1156 gfp_t priority)
1da177e4
LT		 1157{
1158 if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
1159 struct sk_buff * skb = alloc_skb(size, priority);
1160 if (skb) {
1161 skb_set_owner_w(skb, sk);
1162 return skb;
1163 }
1164 }
1165 return NULL;
1166}
1167
1168/*
1169 * Allocate a skb from the socket's receive buffer.
4ec93edb 1170 */
86a76caf 1171struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force,
dd0fc66f 1172 gfp_t priority)
1da177e4
LT		 1173{
1174 if (force || atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) {
1175 struct sk_buff *skb = alloc_skb(size, priority);
1176 if (skb) {
1177 skb_set_owner_r(skb, sk);
1178 return skb;
1179 }
1180 }
1181 return NULL;
1182}
1183
4ec93edb 1184/*
1da177e4 1185 * Allocate a memory block from the socket's option memory buffer.
4ec93edb 1186 */
dd0fc66f 1187void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
1da177e4
LT		 1188{
1189 if ((unsigned)size <= sysctl_optmem_max &&
1190 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) {
1191 void *mem;
1192 /* First do the add, to avoid the race if kmalloc
4ec93edb 1193 * might sleep.
1da177e4
LT		 1194 */
1195 atomic_add(size, &sk->sk_omem_alloc);
1196 mem = kmalloc(size, priority);
1197 if (mem)
1198 return mem;
1199 atomic_sub(size, &sk->sk_omem_alloc);
1200 }
1201 return NULL;
1202}
1203
1204/*
1205 * Free an option memory block.
1206 */
1207void sock_kfree_s(struct sock *sk, void *mem, int size)
1208{
1209 kfree(mem);
1210 atomic_sub(size, &sk->sk_omem_alloc);
1211}
1212
1213/* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
1214 I think, these locks should be removed for datagram sockets.
1215 */
1216static long sock_wait_for_wmem(struct sock * sk, long timeo)
1217{
1218 DEFINE_WAIT(wait);
1219
1220 clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1221 for (;;) {
1222 if (!timeo)
1223 break;
1224 if (signal_pending(current))
1225 break;
1226 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1227 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
1228 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf)
1229 break;
1230 if (sk->sk_shutdown & SEND_SHUTDOWN)
1231 break;
1232 if (sk->sk_err)
1233 break;
1234 timeo = schedule_timeout(timeo);
1235 }
1236 finish_wait(sk->sk_sleep, &wait);
1237 return timeo;
1238}
1239
1240
1241/*
1242 * Generic send/receive buffer handlers
1243 */
1244
1245static struct sk_buff *sock_alloc_send_pskb(struct sock *sk,
1246 unsigned long header_len,
1247 unsigned long data_len,
1248 int noblock, int *errcode)
1249{
1250 struct sk_buff *skb;
7d877f3b 1251 gfp_t gfp_mask;
1da177e4
LT		 1252 long timeo;
1253 int err;
1254
1255 gfp_mask = sk->sk_allocation;
1256 if (gfp_mask & __GFP_WAIT)
1257 gfp_mask |= __GFP_REPEAT;
1258
1259 timeo = sock_sndtimeo(sk, noblock);
1260 while (1) {
1261 err = sock_error(sk);
1262 if (err != 0)
1263 goto failure;
1264
1265 err = -EPIPE;
1266 if (sk->sk_shutdown & SEND_SHUTDOWN)
1267 goto failure;
1268
1269 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
db38c179 1270 skb = alloc_skb(header_len, gfp_mask);
1da177e4
LT		 1271 if (skb) {
1272 int npages;
1273 int i;
1274
1275 /* No pages, we're done... */
1276 if (!data_len)
1277 break;
1278
1279 npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
1280 skb->truesize += data_len;
1281 skb_shinfo(skb)->nr_frags = npages;
1282 for (i = 0; i < npages; i++) {
1283 struct page *page;
1284 skb_frag_t *frag;
1285
1286 page = alloc_pages(sk->sk_allocation, 0);
1287 if (!page) {
1288 err = -ENOBUFS;
1289 skb_shinfo(skb)->nr_frags = i;
1290 kfree_skb(skb);
1291 goto failure;
1292 }
1293
1294 frag = &skb_shinfo(skb)->frags[i];
1295 frag->page = page;
1296 frag->page_offset = 0;
1297 frag->size = (data_len >= PAGE_SIZE ?
1298 PAGE_SIZE :
1299 data_len);
1300 data_len -= PAGE_SIZE;
1301 }
1302
1303 /* Full success... */
1304 break;
1305 }
1306 err = -ENOBUFS;
1307 goto failure;
1308 }
1309 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1310 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1311 err = -EAGAIN;
1312 if (!timeo)
1313 goto failure;
1314 if (signal_pending(current))
1315 goto interrupted;
1316 timeo = sock_wait_for_wmem(sk, timeo);
1317 }
1318
1319 skb_set_owner_w(skb, sk);
1320 return skb;
1321
1322interrupted:
1323 err = sock_intr_errno(timeo);
1324failure:
1325 *errcode = err;
1326 return NULL;
1327}
1328
4ec93edb 1329struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
1da177e4
LT		 1330 int noblock, int *errcode)
1331{
1332 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode);
1333}
1334
1335static void __lock_sock(struct sock *sk)
1336{
1337 DEFINE_WAIT(wait);
1338
e71a4783 1339 for (;;) {
1da177e4
LT		 1340 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
1341 TASK_UNINTERRUPTIBLE);
1342 spin_unlock_bh(&sk->sk_lock.slock);
1343 schedule();
1344 spin_lock_bh(&sk->sk_lock.slock);
e71a4783 1345 if (!sock_owned_by_user(sk))
1da177e4
LT		 1346 break;
1347 }
1348 finish_wait(&sk->sk_lock.wq, &wait);
1349}
1350
1351static void __release_sock(struct sock *sk)
1352{
1353 struct sk_buff *skb = sk->sk_backlog.head;
1354
1355 do {
1356 sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
1357 bh_unlock_sock(sk);
1358
1359 do {
1360 struct sk_buff *next = skb->next;
1361
1362 skb->next = NULL;
1363 sk->sk_backlog_rcv(sk, skb);
1364
1365 /*
1366 * We are in process context here with softirqs
1367 * disabled, use cond_resched_softirq() to preempt.
1368 * This is safe to do because we've taken the backlog
1369 * queue private:
1370 */
1371 cond_resched_softirq();
1372
1373 skb = next;
1374 } while (skb != NULL);
1375
1376 bh_lock_sock(sk);
e71a4783 1377 } while ((skb = sk->sk_backlog.head) != NULL);
1da177e4
LT		 1378}
1379
1380/**
1381 * sk_wait_data - wait for data to arrive at sk_receive_queue
4dc3b16b
PP		 1382 * @sk: sock to wait on
1383 * @timeo: for how long
1da177e4
LT		 1384 *
1385 * Now socket state including sk->sk_err is changed only under lock,
1386 * hence we may omit checks after joining wait queue.
1387 * We check receive queue before schedule() only as optimization;
1388 * it is very likely that release_sock() added new data.
1389 */
1390int sk_wait_data(struct sock *sk, long *timeo)
1391{
1392 int rc;
1393 DEFINE_WAIT(wait);
1394
1395 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
1396 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1397 rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue));
1398 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1399 finish_wait(sk->sk_sleep, &wait);
1400 return rc;
1401}
1402
1403EXPORT_SYMBOL(sk_wait_data);
1404
3ab224be
HA		 1405/**
1406 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated
1407 * @sk: socket
1408 * @size: memory size to allocate
1409 * @kind: allocation type
1410 *
1411 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means
1412 * rmem allocation. This function assumes that protocols which have
1413 * memory_pressure use sk_wmem_queued as write buffer accounting.
1414 */
1415int __sk_mem_schedule(struct sock *sk, int size, int kind)
1416{
1417 struct proto *prot = sk->sk_prot;
1418 int amt = sk_mem_pages(size);
1419 int allocated;
1420
1421 sk->sk_forward_alloc += amt * SK_MEM_QUANTUM;
1422 allocated = atomic_add_return(amt, prot->memory_allocated);
1423
1424 /* Under limit. */
1425 if (allocated <= prot->sysctl_mem[0]) {
1426 if (prot->memory_pressure && *prot->memory_pressure)
1427 *prot->memory_pressure = 0;
1428 return 1;
1429 }
1430
1431 /* Under pressure. */
1432 if (allocated > prot->sysctl_mem[1])
1433 if (prot->enter_memory_pressure)
1434 prot->enter_memory_pressure();
1435
1436 /* Over hard limit. */
1437 if (allocated > prot->sysctl_mem[2])
1438 goto suppress_allocation;
1439
1440 /* guarantee minimum buffer size under pressure */
1441 if (kind == SK_MEM_RECV) {
1442 if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0])
1443 return 1;
1444 } else { /* SK_MEM_SEND */
1445 if (sk->sk_type == SOCK_STREAM) {
1446 if (sk->sk_wmem_queued < prot->sysctl_wmem[0])
1447 return 1;
1448 } else if (atomic_read(&sk->sk_wmem_alloc) <
1449 prot->sysctl_wmem[0])
1450 return 1;
1451 }
1452
1453 if (prot->memory_pressure) {
1454 if (!*prot->memory_pressure ||
1455 prot->sysctl_mem[2] > atomic_read(prot->sockets_allocated) *
1456 sk_mem_pages(sk->sk_wmem_queued +
1457 atomic_read(&sk->sk_rmem_alloc) +
1458 sk->sk_forward_alloc))
1459 return 1;
1460 }
1461
1462suppress_allocation:
1463
1464 if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) {
1465 sk_stream_moderate_sndbuf(sk);
1466
1467 /* Fail only if socket is _under_ its sndbuf.
1468 * In this case we cannot block, so that we have to fail.
1469 */
1470 if (sk->sk_wmem_queued + size >= sk->sk_sndbuf)
1471 return 1;
1472 }
1473
1474 /* Alas. Undo changes. */
1475 sk->sk_forward_alloc -= amt * SK_MEM_QUANTUM;
1476 atomic_sub(amt, prot->memory_allocated);
1477 return 0;
1478}
1479
1480EXPORT_SYMBOL(__sk_mem_schedule);
1481
1482/**
1483 * __sk_reclaim - reclaim memory_allocated
1484 * @sk: socket
1485 */
1486void __sk_mem_reclaim(struct sock *sk)
1487{
1488 struct proto *prot = sk->sk_prot;
1489
680a5a50 1490 atomic_sub(sk->sk_forward_alloc >> SK_MEM_QUANTUM_SHIFT,
3ab224be
HA		 1491 prot->memory_allocated);
1492 sk->sk_forward_alloc &= SK_MEM_QUANTUM - 1;
1493
1494 if (prot->memory_pressure && *prot->memory_pressure &&
1495 (atomic_read(prot->memory_allocated) < prot->sysctl_mem[0]))
1496 *prot->memory_pressure = 0;
1497}
1498
1499EXPORT_SYMBOL(__sk_mem_reclaim);
1500
1501
1da177e4
LT		 1502/*
1503 * Set of default routines for initialising struct proto_ops when
1504 * the protocol does not support a particular function. In certain
1505 * cases where it makes no sense for a protocol to have a "do nothing"
1506 * function, some default processing is provided.
1507 */
1508
1509int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
1510{
1511 return -EOPNOTSUPP;
1512}
1513
4ec93edb 1514int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 1515 int len, int flags)
1516{
1517 return -EOPNOTSUPP;
1518}
1519
1520int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
1521{
1522 return -EOPNOTSUPP;
1523}
1524
1525int sock_no_accept(struct socket *sock, struct socket *newsock, int flags)
1526{
1527 return -EOPNOTSUPP;
1528}
1529
4ec93edb 1530int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
1da177e4
LT		 1531 int *len, int peer)
1532{
1533 return -EOPNOTSUPP;
1534}
1535
1536unsigned int sock_no_poll(struct file * file, struct socket *sock, poll_table *pt)
1537{
1538 return 0;
1539}
1540
1541int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1542{
1543 return -EOPNOTSUPP;
1544}
1545
1546int sock_no_listen(struct socket *sock, int backlog)
1547{
1548 return -EOPNOTSUPP;
1549}
1550
1551int sock_no_shutdown(struct socket *sock, int how)
1552{
1553 return -EOPNOTSUPP;
1554}
1555
1556int sock_no_setsockopt(struct socket *sock, int level, int optname,
1557 char __user *optval, int optlen)
1558{
1559 return -EOPNOTSUPP;
1560}
1561
1562int sock_no_getsockopt(struct socket *sock, int level, int optname,
1563 char __user *optval, int __user *optlen)
1564{
1565 return -EOPNOTSUPP;
1566}
1567
1568int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
1569 size_t len)
1570{
1571 return -EOPNOTSUPP;
1572}
1573
1574int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
1575 size_t len, int flags)
1576{
1577 return -EOPNOTSUPP;
1578}
1579
1580int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
1581{
1582 /* Mirror missing mmap method error code */
1583 return -ENODEV;
1584}
1585
1586ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
1587{
1588 ssize_t res;
1589 struct msghdr msg = {.msg_flags = flags};
1590 struct kvec iov;
1591 char *kaddr = kmap(page);
1592 iov.iov_base = kaddr + offset;
1593 iov.iov_len = size;
1594 res = kernel_sendmsg(sock, &msg, &iov, 1, size);
1595 kunmap(page);
1596 return res;
1597}
1598
1599/*
1600 * Default Socket Callbacks
1601 */
1602
1603static void sock_def_wakeup(struct sock *sk)
1604{
1605 read_lock(&sk->sk_callback_lock);
1606 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
1607 wake_up_interruptible_all(sk->sk_sleep);
1608 read_unlock(&sk->sk_callback_lock);
1609}
1610
1611static void sock_def_error_report(struct sock *sk)
1612{
1613 read_lock(&sk->sk_callback_lock);
1614 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
1615 wake_up_interruptible(sk->sk_sleep);
8d8ad9d7 1616 sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR);
1da177e4
LT		 1617 read_unlock(&sk->sk_callback_lock);
1618}
1619
1620static void sock_def_readable(struct sock *sk, int len)
1621{
1622 read_lock(&sk->sk_callback_lock);
1623 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
1624 wake_up_interruptible(sk->sk_sleep);
8d8ad9d7 1625 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
1da177e4
LT		 1626 read_unlock(&sk->sk_callback_lock);
1627}
1628
1629static void sock_def_write_space(struct sock *sk)
1630{
1631 read_lock(&sk->sk_callback_lock);
1632
1633 /* Do not wake up a writer until he can make "significant"
1634 * progress. --DaveM
1635 */
e71a4783 1636 if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) {
1da177e4
LT		 1637 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
1638 wake_up_interruptible(sk->sk_sleep);
1639
1640 /* Should agree with poll, otherwise some programs break */
1641 if (sock_writeable(sk))
8d8ad9d7 1642 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
1da177e4
LT		 1643 }
1644
1645 read_unlock(&sk->sk_callback_lock);
1646}
1647
1648static void sock_def_destruct(struct sock *sk)
1649{
a51482bd 1650 kfree(sk->sk_protinfo);
1da177e4
LT		 1651}
1652
1653void sk_send_sigurg(struct sock *sk)
1654{
1655 if (sk->sk_socket && sk->sk_socket->file)
1656 if (send_sigurg(&sk->sk_socket->file->f_owner))
8d8ad9d7 1657 sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI);
1da177e4
LT		 1658}
1659
1660void sk_reset_timer(struct sock *sk, struct timer_list* timer,
1661 unsigned long expires)
1662{
1663 if (!mod_timer(timer, expires))
1664 sock_hold(sk);
1665}
1666
1667EXPORT_SYMBOL(sk_reset_timer);
1668
1669void sk_stop_timer(struct sock *sk, struct timer_list* timer)
1670{
1671 if (timer_pending(timer) && del_timer(timer))
1672 __sock_put(sk);
1673}
1674
1675EXPORT_SYMBOL(sk_stop_timer);
1676
1677void sock_init_data(struct socket *sock, struct sock *sk)
1678{
1679 skb_queue_head_init(&sk->sk_receive_queue);
1680 skb_queue_head_init(&sk->sk_write_queue);
1681 skb_queue_head_init(&sk->sk_error_queue);
97fc2f08
CL		 1682#ifdef CONFIG_NET_DMA
1683 skb_queue_head_init(&sk->sk_async_wait_queue);
1684#endif
1da177e4
LT		 1685
1686 sk->sk_send_head = NULL;
1687
1688 init_timer(&sk->sk_timer);
4ec93edb 1689
1da177e4
LT		 1690 sk->sk_allocation = GFP_KERNEL;
1691 sk->sk_rcvbuf = sysctl_rmem_default;
1692 sk->sk_sndbuf = sysctl_wmem_default;
1693 sk->sk_state = TCP_CLOSE;
1694 sk->sk_socket = sock;
1695
1696 sock_set_flag(sk, SOCK_ZAPPED);
1697
e71a4783 1698 if (sock) {
1da177e4
LT		 1699 sk->sk_type = sock->type;
1700 sk->sk_sleep = &sock->wait;
1701 sock->sk = sk;
1702 } else
1703 sk->sk_sleep = NULL;
1704
1705 rwlock_init(&sk->sk_dst_lock);
1706 rwlock_init(&sk->sk_callback_lock);
443aef0e
PZ		 1707 lockdep_set_class_and_name(&sk->sk_callback_lock,
1708 af_callback_keys + sk->sk_family,
1709 af_family_clock_key_strings[sk->sk_family]);
1da177e4
LT		 1710
1711 sk->sk_state_change = sock_def_wakeup;
1712 sk->sk_data_ready = sock_def_readable;
1713 sk->sk_write_space = sock_def_write_space;
1714 sk->sk_error_report = sock_def_error_report;
1715 sk->sk_destruct = sock_def_destruct;
1716
1717 sk->sk_sndmsg_page = NULL;
1718 sk->sk_sndmsg_off = 0;
1719
1720 sk->sk_peercred.pid = 0;
1721 sk->sk_peercred.uid = -1;
1722 sk->sk_peercred.gid = -1;
1723 sk->sk_write_pending = 0;
1724 sk->sk_rcvlowat = 1;
1725 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
1726 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
1727
b7aa0bf7 1728 sk->sk_stamp = ktime_set(-1L, -1L);
1da177e4
LT		 1729
1730 atomic_set(&sk->sk_refcnt, 1);
33c732c3 1731 atomic_set(&sk->sk_drops, 0);
1da177e4
LT		 1732}
1733
b5606c2d 1734void lock_sock_nested(struct sock *sk, int subclass)
1da177e4
LT		 1735{
1736 might_sleep();
a5b5bb9a 1737 spin_lock_bh(&sk->sk_lock.slock);
d2e9117c 1738 if (sk->sk_lock.owned)
1da177e4 1739 __lock_sock(sk);
d2e9117c 1740 sk->sk_lock.owned = 1;
a5b5bb9a
IM		 1741 spin_unlock(&sk->sk_lock.slock);
1742 /*
1743 * The sk_lock has mutex_lock() semantics here:
1744 */
fcc70d5f 1745 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
a5b5bb9a 1746 local_bh_enable();
1da177e4
LT		 1747}
1748
fcc70d5f 1749EXPORT_SYMBOL(lock_sock_nested);
1da177e4 1750
b5606c2d 1751void release_sock(struct sock *sk)
1da177e4 1752{
a5b5bb9a
IM		 1753 /*
1754 * The sk_lock has mutex_unlock() semantics:
1755 */
1756 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
1757
1758 spin_lock_bh(&sk->sk_lock.slock);
1da177e4
LT		 1759 if (sk->sk_backlog.tail)
1760 __release_sock(sk);
d2e9117c 1761 sk->sk_lock.owned = 0;
a5b5bb9a
IM		 1762 if (waitqueue_active(&sk->sk_lock.wq))
1763 wake_up(&sk->sk_lock.wq);
1764 spin_unlock_bh(&sk->sk_lock.slock);
1da177e4
LT		 1765}
1766EXPORT_SYMBOL(release_sock);
1767
1768int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
4ec93edb 1769{
b7aa0bf7 1770 struct timeval tv;
1da177e4
LT		 1771 if (!sock_flag(sk, SOCK_TIMESTAMP))
1772 sock_enable_timestamp(sk);
b7aa0bf7
ED		 1773 tv = ktime_to_timeval(sk->sk_stamp);
1774 if (tv.tv_sec == -1)
1da177e4 1775 return -ENOENT;
b7aa0bf7
ED		 1776 if (tv.tv_sec == 0) {
1777 sk->sk_stamp = ktime_get_real();
1778 tv = ktime_to_timeval(sk->sk_stamp);
1779 }
1780 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0;
4ec93edb 1781}
1da177e4
LT		 1782EXPORT_SYMBOL(sock_get_timestamp);
1783
ae40eb1e
ED		 1784int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
1785{
1786 struct timespec ts;
1787 if (!sock_flag(sk, SOCK_TIMESTAMP))
1788 sock_enable_timestamp(sk);
1789 ts = ktime_to_timespec(sk->sk_stamp);
1790 if (ts.tv_sec == -1)
1791 return -ENOENT;
1792 if (ts.tv_sec == 0) {
1793 sk->sk_stamp = ktime_get_real();
1794 ts = ktime_to_timespec(sk->sk_stamp);
1795 }
1796 return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0;
1797}
1798EXPORT_SYMBOL(sock_get_timestampns);
1799
1da177e4 1800void sock_enable_timestamp(struct sock *sk)
4ec93edb
YH		 1801{
1802 if (!sock_flag(sk, SOCK_TIMESTAMP)) {
1da177e4
LT		 1803 sock_set_flag(sk, SOCK_TIMESTAMP);
1804 net_enable_timestamp();
1805 }
1806}
1da177e4
LT		 1807
1808/*
1809 * Get a socket option on an socket.
1810 *
1811 * FIX: POSIX 1003.1g is very ambiguous here. It states that
1812 * asynchronous errors should be reported by getsockopt. We assume
1813 * this means if you specify SO_ERROR (otherwise whats the point of it).
1814 */
1815int sock_common_getsockopt(struct socket *sock, int level, int optname,
1816 char __user *optval, int __user *optlen)
1817{
1818 struct sock *sk = sock->sk;
1819
1820 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
1821}
1822
1823EXPORT_SYMBOL(sock_common_getsockopt);
1824
3fdadf7d 1825#ifdef CONFIG_COMPAT
543d9cfe
ACM		 1826int compat_sock_common_getsockopt(struct socket *sock, int level, int optname,
1827 char __user *optval, int __user *optlen)
3fdadf7d
DM		 1828{
1829 struct sock *sk = sock->sk;
1830
1e51f951 1831 if (sk->sk_prot->compat_getsockopt != NULL)
543d9cfe
ACM		 1832 return sk->sk_prot->compat_getsockopt(sk, level, optname,
1833 optval, optlen);
3fdadf7d
DM		 1834 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
1835}
1836EXPORT_SYMBOL(compat_sock_common_getsockopt);
1837#endif
1838
1da177e4
LT		 1839int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock,
1840 struct msghdr *msg, size_t size, int flags)
1841{
1842 struct sock *sk = sock->sk;
1843 int addr_len = 0;
1844 int err;
1845
1846 err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT,
1847 flags & ~MSG_DONTWAIT, &addr_len);
1848 if (err >= 0)
1849 msg->msg_namelen = addr_len;
1850 return err;
1851}
1852
1853EXPORT_SYMBOL(sock_common_recvmsg);
1854
1855/*
1856 * Set socket options on an inet socket.
1857 */
1858int sock_common_setsockopt(struct socket *sock, int level, int optname,
1859 char __user *optval, int optlen)
1860{
1861 struct sock *sk = sock->sk;
1862
1863 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
1864}
1865
1866EXPORT_SYMBOL(sock_common_setsockopt);
1867
3fdadf7d 1868#ifdef CONFIG_COMPAT
543d9cfe
ACM		 1869int compat_sock_common_setsockopt(struct socket *sock, int level, int optname,
1870 char __user *optval, int optlen)
3fdadf7d
DM		 1871{
1872 struct sock *sk = sock->sk;
1873
543d9cfe
ACM		 1874 if (sk->sk_prot->compat_setsockopt != NULL)
1875 return sk->sk_prot->compat_setsockopt(sk, level, optname,
1876 optval, optlen);
3fdadf7d
DM		 1877 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
1878}
1879EXPORT_SYMBOL(compat_sock_common_setsockopt);
1880#endif
1881
1da177e4
LT		 1882void sk_common_release(struct sock *sk)
1883{
1884 if (sk->sk_prot->destroy)
1885 sk->sk_prot->destroy(sk);
1886
1887 /*
1888 * Observation: when sock_common_release is called, processes have
1889 * no access to socket. But net still has.
1890 * Step one, detach it from networking:
1891 *
1892 * A. Remove from hash tables.
1893 */
1894
1895 sk->sk_prot->unhash(sk);
1896
1897 /*
1898 * In this point socket cannot receive new packets, but it is possible
1899 * that some packets are in flight because some CPU runs receiver and
1900 * did hash table lookup before we unhashed socket. They will achieve
1901 * receive queue and will be purged by socket destructor.
1902 *
1903 * Also we still have packets pending on receive queue and probably,
1904 * our own packets waiting in device queues. sock_destroy will drain
1905 * receive queue, but transmitted packets will delay socket destruction
1906 * until the last reference will be released.
1907 */
1908
1909 sock_orphan(sk);
1910
1911 xfrm_sk_free_policy(sk);
1912
e6848976 1913 sk_refcnt_debug_release(sk);
1da177e4
LT		 1914 sock_put(sk);
1915}
1916
1917EXPORT_SYMBOL(sk_common_release);
1918
1919static DEFINE_RWLOCK(proto_list_lock);
1920static LIST_HEAD(proto_list);
1921
b733c007
PE		 1922int proto_register(struct proto *prot, int alloc_slab)
1923{
1924 char *request_sock_slab_name = NULL;
1925 char *timewait_sock_slab_name;
1926
65f76517 1927 if (sock_prot_inuse_init(prot) != 0) {
ebb53d75 1928 printk(KERN_CRIT "%s: Can't alloc inuse counters!\n", prot->name);
b733c007 1929 goto out;
ebb53d75 1930 }
b733c007 1931
1da177e4
LT		 1932 if (alloc_slab) {
1933 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0,
20c2df83 1934 SLAB_HWCACHE_ALIGN, NULL);
1da177e4
LT		 1935
1936 if (prot->slab == NULL) {
1937 printk(KERN_CRIT "%s: Can't create sock SLAB cache!\n",
1938 prot->name);
286ab3d4 1939 goto out_free_inuse;
1da177e4 1940 }
2e6599cb
ACM		 1941
1942 if (prot->rsk_prot != NULL) {
1943 static const char mask[] = "request_sock_%s";
1944
1945 request_sock_slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL);
1946 if (request_sock_slab_name == NULL)
1947 goto out_free_sock_slab;
1948
1949 sprintf(request_sock_slab_name, mask, prot->name);
1950 prot->rsk_prot->slab = kmem_cache_create(request_sock_slab_name,
1951 prot->rsk_prot->obj_size, 0,
20c2df83 1952 SLAB_HWCACHE_ALIGN, NULL);
2e6599cb
ACM		 1953
1954 if (prot->rsk_prot->slab == NULL) {
1955 printk(KERN_CRIT "%s: Can't create request sock SLAB cache!\n",
1956 prot->name);
1957 goto out_free_request_sock_slab_name;
1958 }
1959 }
8feaf0c0 1960
6d6ee43e 1961 if (prot->twsk_prot != NULL) {
8feaf0c0
ACM		 1962 static const char mask[] = "tw_sock_%s";
1963
1964 timewait_sock_slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL);
1965
1966 if (timewait_sock_slab_name == NULL)
1967 goto out_free_request_sock_slab;
1968
1969 sprintf(timewait_sock_slab_name, mask, prot->name);
6d6ee43e
ACM		 1970 prot->twsk_prot->twsk_slab =
1971 kmem_cache_create(timewait_sock_slab_name,
1972 prot->twsk_prot->twsk_obj_size,
1973 0, SLAB_HWCACHE_ALIGN,
20c2df83 1974 NULL);
6d6ee43e 1975 if (prot->twsk_prot->twsk_slab == NULL)
8feaf0c0
ACM		 1976 goto out_free_timewait_sock_slab_name;
1977 }
1da177e4
LT		 1978 }
1979
2a278051 1980 write_lock(&proto_list_lock);
1da177e4 1981 list_add(&prot->node, &proto_list);
1da177e4 1982 write_unlock(&proto_list_lock);
b733c007
PE		 1983 return 0;
1984
8feaf0c0
ACM		 1985out_free_timewait_sock_slab_name:
1986 kfree(timewait_sock_slab_name);
1987out_free_request_sock_slab:
1988 if (prot->rsk_prot && prot->rsk_prot->slab) {
1989 kmem_cache_destroy(prot->rsk_prot->slab);
1990 prot->rsk_prot->slab = NULL;
1991 }
2e6599cb
ACM		 1992out_free_request_sock_slab_name:
1993 kfree(request_sock_slab_name);
1994out_free_sock_slab:
1995 kmem_cache_destroy(prot->slab);
1996 prot->slab = NULL;
286ab3d4 1997out_free_inuse:
65f76517 1998 sock_prot_inuse_free(prot);
b733c007
PE		 1999out:
2000 return -ENOBUFS;
1da177e4
LT		 2001}
2002
2003EXPORT_SYMBOL(proto_register);
2004
2005void proto_unregister(struct proto *prot)
2006{
2007 write_lock(&proto_list_lock);
0a3f4358
PM		 2008 list_del(&prot->node);
2009 write_unlock(&proto_list_lock);
1da177e4 2010
65f76517 2011 sock_prot_inuse_free(prot);
ebb53d75 2012
1da177e4
LT		 2013 if (prot->slab != NULL) {
2014 kmem_cache_destroy(prot->slab);
2015 prot->slab = NULL;
2016 }
2017
2e6599cb
ACM		 2018 if (prot->rsk_prot != NULL && prot->rsk_prot->slab != NULL) {
2019 const char *name = kmem_cache_name(prot->rsk_prot->slab);
2020
2021 kmem_cache_destroy(prot->rsk_prot->slab);
2022 kfree(name);
2023 prot->rsk_prot->slab = NULL;
2024 }
2025
6d6ee43e
ACM		 2026 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) {
2027 const char *name = kmem_cache_name(prot->twsk_prot->twsk_slab);
8feaf0c0 2028
6d6ee43e 2029 kmem_cache_destroy(prot->twsk_prot->twsk_slab);
8feaf0c0 2030 kfree(name);
6d6ee43e 2031 prot->twsk_prot->twsk_slab = NULL;
8feaf0c0 2032 }
1da177e4
LT		 2033}
2034
2035EXPORT_SYMBOL(proto_unregister);
2036
2037#ifdef CONFIG_PROC_FS
1da177e4 2038static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
9a429c49 2039 __acquires(proto_list_lock)
1da177e4
LT		 2040{
2041 read_lock(&proto_list_lock);
60f0438a 2042 return seq_list_start_head(&proto_list, *pos);
1da177e4
LT		 2043}
2044
2045static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2046{
60f0438a 2047 return seq_list_next(v, &proto_list, pos);
1da177e4
LT		 2048}
2049
2050static void proto_seq_stop(struct seq_file *seq, void *v)
9a429c49 2051 __releases(proto_list_lock)
1da177e4
LT		 2052{
2053 read_unlock(&proto_list_lock);
2054}
2055
2056static char proto_method_implemented(const void *method)
2057{
2058 return method == NULL ? 'n' : 'y';
2059}
2060
2061static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
2062{
2063 seq_printf(seq, "%-9s %4u %6d %6d %-3s %6u %-3s %-10s "
2064 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
2065 proto->name,
2066 proto->obj_size,
2067 proto->sockets_allocated != NULL ? atomic_read(proto->sockets_allocated) : -1,
2068 proto->memory_allocated != NULL ? atomic_read(proto->memory_allocated) : -1,
2069 proto->memory_pressure != NULL ? *proto->memory_pressure ? "yes" : "no" : "NI",
2070 proto->max_header,
2071 proto->slab == NULL ? "no" : "yes",
2072 module_name(proto->owner),
2073 proto_method_implemented(proto->close),
2074 proto_method_implemented(proto->connect),
2075 proto_method_implemented(proto->disconnect),
2076 proto_method_implemented(proto->accept),
2077 proto_method_implemented(proto->ioctl),
2078 proto_method_implemented(proto->init),
2079 proto_method_implemented(proto->destroy),
2080 proto_method_implemented(proto->shutdown),
2081 proto_method_implemented(proto->setsockopt),
2082 proto_method_implemented(proto->getsockopt),
2083 proto_method_implemented(proto->sendmsg),
2084 proto_method_implemented(proto->recvmsg),
2085 proto_method_implemented(proto->sendpage),
2086 proto_method_implemented(proto->bind),
2087 proto_method_implemented(proto->backlog_rcv),
2088 proto_method_implemented(proto->hash),
2089 proto_method_implemented(proto->unhash),
2090 proto_method_implemented(proto->get_port),
2091 proto_method_implemented(proto->enter_memory_pressure));
2092}
2093
2094static int proto_seq_show(struct seq_file *seq, void *v)
2095{
60f0438a 2096 if (v == &proto_list)
1da177e4
LT		 2097 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
2098 "protocol",
2099 "size",
2100 "sockets",
2101 "memory",
2102 "press",
2103 "maxhdr",
2104 "slab",
2105 "module",
2106 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
2107 else
60f0438a 2108 proto_seq_printf(seq, list_entry(v, struct proto, node));
1da177e4
LT		 2109 return 0;
2110}
2111
f690808e 2112static const struct seq_operations proto_seq_ops = {
1da177e4
LT		 2113 .start = proto_seq_start,
2114 .next = proto_seq_next,
2115 .stop = proto_seq_stop,
2116 .show = proto_seq_show,
2117};
2118
2119static int proto_seq_open(struct inode *inode, struct file *file)
2120{
2121 return seq_open(file, &proto_seq_ops);
2122}
2123
9a32144e 2124static const struct file_operations proto_seq_fops = {
1da177e4
LT		 2125 .owner = THIS_MODULE,
2126 .open = proto_seq_open,
2127 .read = seq_read,
2128 .llseek = seq_lseek,
2129 .release = seq_release,
2130};
2131
2132static int __init proto_init(void)
2133{
2134 /* register /proc/net/protocols */
457c4cbc 2135 return proc_net_fops_create(&init_net, "protocols", S_IRUGO, &proto_seq_fops) == NULL ? -ENOBUFS : 0;
1da177e4
LT		 2136}
2137
2138subsys_initcall(proto_init);
2139
2140#endif /* PROC_FS */
2141
2142EXPORT_SYMBOL(sk_alloc);
2143EXPORT_SYMBOL(sk_free);
2144EXPORT_SYMBOL(sk_send_sigurg);
2145EXPORT_SYMBOL(sock_alloc_send_skb);
2146EXPORT_SYMBOL(sock_init_data);
2147EXPORT_SYMBOL(sock_kfree_s);
2148EXPORT_SYMBOL(sock_kmalloc);
2149EXPORT_SYMBOL(sock_no_accept);
2150EXPORT_SYMBOL(sock_no_bind);
2151EXPORT_SYMBOL(sock_no_connect);
2152EXPORT_SYMBOL(sock_no_getname);
2153EXPORT_SYMBOL(sock_no_getsockopt);
2154EXPORT_SYMBOL(sock_no_ioctl);
2155EXPORT_SYMBOL(sock_no_listen);
2156EXPORT_SYMBOL(sock_no_mmap);
2157EXPORT_SYMBOL(sock_no_poll);
2158EXPORT_SYMBOL(sock_no_recvmsg);
2159EXPORT_SYMBOL(sock_no_sendmsg);
2160EXPORT_SYMBOL(sock_no_sendpage);
2161EXPORT_SYMBOL(sock_no_setsockopt);
2162EXPORT_SYMBOL(sock_no_shutdown);
2163EXPORT_SYMBOL(sock_no_socketpair);
2164EXPORT_SYMBOL(sock_rfree);
2165EXPORT_SYMBOL(sock_setsockopt);
2166EXPORT_SYMBOL(sock_wfree);
2167EXPORT_SYMBOL(sock_wmalloc);
2168EXPORT_SYMBOL(sock_i_uid);
2169EXPORT_SYMBOL(sock_i_ino);
1da177e4 2170EXPORT_SYMBOL(sysctl_optmem_max);
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