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.
6 * Generic socket support routines. Memory allocators, socket lock/release
7 * handler for protocols to use and generic option handler.
10 * Version: $Id: sock.c,v 1.117 2002/02/01 22:01:03 davem Exp $
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>
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
37 * code. The ACK stuff can wait and needs major
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
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
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.
94 #include <linux/capability.h>
95 #include <linux/config.h>
96 #include <linux/errno.h>
97 #include <linux/types.h>
98 #include <linux/socket.h>
100 #include <linux/kernel.h>
101 #include <linux/module.h>
102 #include <linux/proc_fs.h>
103 #include <linux/seq_file.h>
104 #include <linux/sched.h>
105 #include <linux/timer.h>
106 #include <linux/string.h>
107 #include <linux/sockios.h>
108 #include <linux/net.h>
109 #include <linux/mm.h>
110 #include <linux/slab.h>
111 #include <linux/interrupt.h>
112 #include <linux/poll.h>
113 #include <linux/tcp.h>
114 #include <linux/init.h>
116 #include <asm/uaccess.h>
117 #include <asm/system.h>
119 #include <linux/netdevice.h>
120 #include <net/protocol.h>
121 #include <linux/skbuff.h>
122 #include <net/request_sock.h>
123 #include <net/sock.h>
124 #include <net/xfrm.h>
125 #include <linux/ipsec.h>
127 #include <linux/filter.h>
133 /* Take into consideration the size of the struct sk_buff overhead in the
134 * determination of these values, since that is non-constant across
135 * platforms. This makes socket queueing behavior and performance
136 * not depend upon such differences.
138 #define _SK_MEM_PACKETS 256
139 #define _SK_MEM_OVERHEAD (sizeof(struct sk_buff) + 256)
140 #define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
141 #define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
143 /* Run time adjustable parameters. */
144 __u32 sysctl_wmem_max
= SK_WMEM_MAX
;
145 __u32 sysctl_rmem_max
= SK_RMEM_MAX
;
146 __u32 sysctl_wmem_default
= SK_WMEM_MAX
;
147 __u32 sysctl_rmem_default
= SK_RMEM_MAX
;
149 /* Maximal space eaten by iovec or ancilliary data plus some space */
150 int sysctl_optmem_max
= sizeof(unsigned long)*(2*UIO_MAXIOV
+ 512);
152 static int sock_set_timeout(long *timeo_p
, char __user
*optval
, int optlen
)
156 if (optlen
< sizeof(tv
))
158 if (copy_from_user(&tv
, optval
, sizeof(tv
)))
161 *timeo_p
= MAX_SCHEDULE_TIMEOUT
;
162 if (tv
.tv_sec
== 0 && tv
.tv_usec
== 0)
164 if (tv
.tv_sec
< (MAX_SCHEDULE_TIMEOUT
/HZ
- 1))
165 *timeo_p
= tv
.tv_sec
*HZ
+ (tv
.tv_usec
+(1000000/HZ
-1))/(1000000/HZ
);
169 static void sock_warn_obsolete_bsdism(const char *name
)
172 static char warncomm
[TASK_COMM_LEN
];
173 if (strcmp(warncomm
, current
->comm
) && warned
< 5) {
174 strcpy(warncomm
, current
->comm
);
175 printk(KERN_WARNING
"process `%s' is using obsolete "
176 "%s SO_BSDCOMPAT\n", warncomm
, name
);
181 static void sock_disable_timestamp(struct sock
*sk
)
183 if (sock_flag(sk
, SOCK_TIMESTAMP
)) {
184 sock_reset_flag(sk
, SOCK_TIMESTAMP
);
185 net_disable_timestamp();
191 * This is meant for all protocols to use and covers goings on
192 * at the socket level. Everything here is generic.
195 int sock_setsockopt(struct socket
*sock
, int level
, int optname
,
196 char __user
*optval
, int optlen
)
198 struct sock
*sk
=sock
->sk
;
199 struct sk_filter
*filter
;
206 * Options without arguments
209 #ifdef SO_DONTLINGER /* Compatibility item... */
210 if (optname
== SO_DONTLINGER
) {
212 sock_reset_flag(sk
, SOCK_LINGER
);
218 if(optlen
<sizeof(int))
221 if (get_user(val
, (int __user
*)optval
))
231 if(val
&& !capable(CAP_NET_ADMIN
))
236 sock_set_flag(sk
, SOCK_DBG
);
238 sock_reset_flag(sk
, SOCK_DBG
);
241 sk
->sk_reuse
= valbool
;
249 sock_set_flag(sk
, SOCK_LOCALROUTE
);
251 sock_reset_flag(sk
, SOCK_LOCALROUTE
);
254 sock_valbool_flag(sk
, SOCK_BROADCAST
, valbool
);
257 /* Don't error on this BSD doesn't and if you think
258 about it this is right. Otherwise apps have to
259 play 'guess the biggest size' games. RCVBUF/SNDBUF
260 are treated in BSD as hints */
262 if (val
> sysctl_wmem_max
)
263 val
= sysctl_wmem_max
;
265 sk
->sk_userlocks
|= SOCK_SNDBUF_LOCK
;
266 if ((val
* 2) < SOCK_MIN_SNDBUF
)
267 sk
->sk_sndbuf
= SOCK_MIN_SNDBUF
;
269 sk
->sk_sndbuf
= val
* 2;
272 * Wake up sending tasks if we
275 sk
->sk_write_space(sk
);
279 if (!capable(CAP_NET_ADMIN
)) {
286 /* Don't error on this BSD doesn't and if you think
287 about it this is right. Otherwise apps have to
288 play 'guess the biggest size' games. RCVBUF/SNDBUF
289 are treated in BSD as hints */
291 if (val
> sysctl_rmem_max
)
292 val
= sysctl_rmem_max
;
294 sk
->sk_userlocks
|= SOCK_RCVBUF_LOCK
;
295 /* FIXME: is this lower bound the right one? */
296 if ((val
* 2) < SOCK_MIN_RCVBUF
)
297 sk
->sk_rcvbuf
= SOCK_MIN_RCVBUF
;
299 sk
->sk_rcvbuf
= val
* 2;
303 if (!capable(CAP_NET_ADMIN
)) {
311 if (sk
->sk_protocol
== IPPROTO_TCP
)
312 tcp_set_keepalive(sk
, valbool
);
314 sock_valbool_flag(sk
, SOCK_KEEPOPEN
, valbool
);
318 sock_valbool_flag(sk
, SOCK_URGINLINE
, valbool
);
322 sk
->sk_no_check
= valbool
;
326 if ((val
>= 0 && val
<= 6) || capable(CAP_NET_ADMIN
))
327 sk
->sk_priority
= val
;
333 if(optlen
<sizeof(ling
)) {
334 ret
= -EINVAL
; /* 1003.1g */
337 if (copy_from_user(&ling
,optval
,sizeof(ling
))) {
342 sock_reset_flag(sk
, SOCK_LINGER
);
344 #if (BITS_PER_LONG == 32)
345 if ((unsigned int)ling
.l_linger
>= MAX_SCHEDULE_TIMEOUT
/HZ
)
346 sk
->sk_lingertime
= MAX_SCHEDULE_TIMEOUT
;
349 sk
->sk_lingertime
= (unsigned int)ling
.l_linger
* HZ
;
350 sock_set_flag(sk
, SOCK_LINGER
);
355 sock_warn_obsolete_bsdism("setsockopt");
360 set_bit(SOCK_PASSCRED
, &sock
->flags
);
362 clear_bit(SOCK_PASSCRED
, &sock
->flags
);
367 sock_set_flag(sk
, SOCK_RCVTSTAMP
);
368 sock_enable_timestamp(sk
);
370 sock_reset_flag(sk
, SOCK_RCVTSTAMP
);
376 sk
->sk_rcvlowat
= val
? : 1;
380 ret
= sock_set_timeout(&sk
->sk_rcvtimeo
, optval
, optlen
);
384 ret
= sock_set_timeout(&sk
->sk_sndtimeo
, optval
, optlen
);
387 #ifdef CONFIG_NETDEVICES
388 case SO_BINDTODEVICE
:
390 char devname
[IFNAMSIZ
];
393 if (!capable(CAP_NET_RAW
)) {
398 /* Bind this socket to a particular device like "eth0",
399 * as specified in the passed interface name. If the
400 * name is "" or the option length is zero the socket
405 sk
->sk_bound_dev_if
= 0;
407 if (optlen
> IFNAMSIZ
- 1)
408 optlen
= IFNAMSIZ
- 1;
409 memset(devname
, 0, sizeof(devname
));
410 if (copy_from_user(devname
, optval
, optlen
)) {
415 /* Remove any cached route for this socket. */
418 if (devname
[0] == '\0') {
419 sk
->sk_bound_dev_if
= 0;
421 struct net_device
*dev
= dev_get_by_name(devname
);
426 sk
->sk_bound_dev_if
= dev
->ifindex
;
435 case SO_ATTACH_FILTER
:
437 if (optlen
== sizeof(struct sock_fprog
)) {
438 struct sock_fprog fprog
;
441 if (copy_from_user(&fprog
, optval
, sizeof(fprog
)))
444 ret
= sk_attach_filter(&fprog
, sk
);
448 case SO_DETACH_FILTER
:
449 spin_lock_bh(&sk
->sk_lock
.slock
);
450 filter
= sk
->sk_filter
;
452 sk
->sk_filter
= NULL
;
453 spin_unlock_bh(&sk
->sk_lock
.slock
);
454 sk_filter_release(sk
, filter
);
457 spin_unlock_bh(&sk
->sk_lock
.slock
);
461 /* We implement the SO_SNDLOWAT etc to
462 not be settable (1003.1g 5.3) */
472 int sock_getsockopt(struct socket
*sock
, int level
, int optname
,
473 char __user
*optval
, int __user
*optlen
)
475 struct sock
*sk
= sock
->sk
;
484 unsigned int lv
= sizeof(int);
487 if(get_user(len
,optlen
))
495 v
.val
= sock_flag(sk
, SOCK_DBG
);
499 v
.val
= sock_flag(sk
, SOCK_LOCALROUTE
);
503 v
.val
= !!sock_flag(sk
, SOCK_BROADCAST
);
507 v
.val
= sk
->sk_sndbuf
;
511 v
.val
= sk
->sk_rcvbuf
;
515 v
.val
= sk
->sk_reuse
;
519 v
.val
= !!sock_flag(sk
, SOCK_KEEPOPEN
);
527 v
.val
= -sock_error(sk
);
529 v
.val
= xchg(&sk
->sk_err_soft
, 0);
533 v
.val
= !!sock_flag(sk
, SOCK_URGINLINE
);
537 v
.val
= sk
->sk_no_check
;
541 v
.val
= sk
->sk_priority
;
546 v
.ling
.l_onoff
= !!sock_flag(sk
, SOCK_LINGER
);
547 v
.ling
.l_linger
= sk
->sk_lingertime
/ HZ
;
551 sock_warn_obsolete_bsdism("getsockopt");
555 v
.val
= sock_flag(sk
, SOCK_RCVTSTAMP
);
559 lv
=sizeof(struct timeval
);
560 if (sk
->sk_rcvtimeo
== MAX_SCHEDULE_TIMEOUT
) {
564 v
.tm
.tv_sec
= sk
->sk_rcvtimeo
/ HZ
;
565 v
.tm
.tv_usec
= ((sk
->sk_rcvtimeo
% HZ
) * 1000000) / HZ
;
570 lv
=sizeof(struct timeval
);
571 if (sk
->sk_sndtimeo
== MAX_SCHEDULE_TIMEOUT
) {
575 v
.tm
.tv_sec
= sk
->sk_sndtimeo
/ HZ
;
576 v
.tm
.tv_usec
= ((sk
->sk_sndtimeo
% HZ
) * 1000000) / HZ
;
581 v
.val
= sk
->sk_rcvlowat
;
589 v
.val
= test_bit(SOCK_PASSCRED
, &sock
->flags
) ? 1 : 0;
593 if (len
> sizeof(sk
->sk_peercred
))
594 len
= sizeof(sk
->sk_peercred
);
595 if (copy_to_user(optval
, &sk
->sk_peercred
, len
))
603 if (sock
->ops
->getname(sock
, (struct sockaddr
*)address
, &lv
, 2))
607 if (copy_to_user(optval
, address
, len
))
612 /* Dubious BSD thing... Probably nobody even uses it, but
613 * the UNIX standard wants it for whatever reason... -DaveM
616 v
.val
= sk
->sk_state
== TCP_LISTEN
;
620 return security_socket_getpeersec_stream(sock
, optval
, optlen
, len
);
623 return(-ENOPROTOOPT
);
627 if (copy_to_user(optval
, &v
, len
))
630 if (put_user(len
, optlen
))
636 * sk_alloc - All socket objects are allocated here
637 * @family: protocol family
638 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
639 * @prot: struct proto associated with this new sock instance
640 * @zero_it: if we should zero the newly allocated sock
642 struct sock
*sk_alloc(int family
, gfp_t priority
,
643 struct proto
*prot
, int zero_it
)
645 struct sock
*sk
= NULL
;
646 kmem_cache_t
*slab
= prot
->slab
;
649 sk
= kmem_cache_alloc(slab
, priority
);
651 sk
= kmalloc(prot
->obj_size
, priority
);
655 memset(sk
, 0, prot
->obj_size
);
656 sk
->sk_family
= family
;
658 * See comment in struct sock definition to understand
659 * why we need sk_prot_creator -acme
661 sk
->sk_prot
= sk
->sk_prot_creator
= prot
;
665 if (security_sk_alloc(sk
, family
, priority
))
668 if (!try_module_get(prot
->owner
))
675 kmem_cache_free(slab
, sk
);
681 void sk_free(struct sock
*sk
)
683 struct sk_filter
*filter
;
684 struct module
*owner
= sk
->sk_prot_creator
->owner
;
689 filter
= sk
->sk_filter
;
691 sk_filter_release(sk
, filter
);
692 sk
->sk_filter
= NULL
;
695 sock_disable_timestamp(sk
);
697 if (atomic_read(&sk
->sk_omem_alloc
))
698 printk(KERN_DEBUG
"%s: optmem leakage (%d bytes) detected.\n",
699 __FUNCTION__
, atomic_read(&sk
->sk_omem_alloc
));
701 security_sk_free(sk
);
702 if (sk
->sk_prot_creator
->slab
!= NULL
)
703 kmem_cache_free(sk
->sk_prot_creator
->slab
, sk
);
709 struct sock
*sk_clone(const struct sock
*sk
, const gfp_t priority
)
711 struct sock
*newsk
= sk_alloc(sk
->sk_family
, priority
, sk
->sk_prot
, 0);
714 struct sk_filter
*filter
;
716 memcpy(newsk
, sk
, sk
->sk_prot
->obj_size
);
719 sk_node_init(&newsk
->sk_node
);
720 sock_lock_init(newsk
);
723 atomic_set(&newsk
->sk_rmem_alloc
, 0);
724 atomic_set(&newsk
->sk_wmem_alloc
, 0);
725 atomic_set(&newsk
->sk_omem_alloc
, 0);
726 skb_queue_head_init(&newsk
->sk_receive_queue
);
727 skb_queue_head_init(&newsk
->sk_write_queue
);
729 rwlock_init(&newsk
->sk_dst_lock
);
730 rwlock_init(&newsk
->sk_callback_lock
);
732 newsk
->sk_dst_cache
= NULL
;
733 newsk
->sk_wmem_queued
= 0;
734 newsk
->sk_forward_alloc
= 0;
735 newsk
->sk_send_head
= NULL
;
736 newsk
->sk_backlog
.head
= newsk
->sk_backlog
.tail
= NULL
;
737 newsk
->sk_userlocks
= sk
->sk_userlocks
& ~SOCK_BINDPORT_LOCK
;
739 sock_reset_flag(newsk
, SOCK_DONE
);
740 skb_queue_head_init(&newsk
->sk_error_queue
);
742 filter
= newsk
->sk_filter
;
744 sk_filter_charge(newsk
, filter
);
746 if (unlikely(xfrm_sk_clone_policy(newsk
))) {
747 /* It is still raw copy of parent, so invalidate
748 * destructor and make plain sk_free() */
749 newsk
->sk_destruct
= NULL
;
756 newsk
->sk_priority
= 0;
757 atomic_set(&newsk
->sk_refcnt
, 2);
760 * Increment the counter in the same struct proto as the master
761 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
762 * is the same as sk->sk_prot->socks, as this field was copied
765 * This _changes_ the previous behaviour, where
766 * tcp_create_openreq_child always was incrementing the
767 * equivalent to tcp_prot->socks (inet_sock_nr), so this have
768 * to be taken into account in all callers. -acme
770 sk_refcnt_debug_inc(newsk
);
771 newsk
->sk_socket
= NULL
;
772 newsk
->sk_sleep
= NULL
;
774 if (newsk
->sk_prot
->sockets_allocated
)
775 atomic_inc(newsk
->sk_prot
->sockets_allocated
);
781 EXPORT_SYMBOL_GPL(sk_clone
);
783 void __init
sk_init(void)
785 if (num_physpages
<= 4096) {
786 sysctl_wmem_max
= 32767;
787 sysctl_rmem_max
= 32767;
788 sysctl_wmem_default
= 32767;
789 sysctl_rmem_default
= 32767;
790 } else if (num_physpages
>= 131072) {
791 sysctl_wmem_max
= 131071;
792 sysctl_rmem_max
= 131071;
797 * Simple resource managers for sockets.
802 * Write buffer destructor automatically called from kfree_skb.
804 void sock_wfree(struct sk_buff
*skb
)
806 struct sock
*sk
= skb
->sk
;
808 /* In case it might be waiting for more memory. */
809 atomic_sub(skb
->truesize
, &sk
->sk_wmem_alloc
);
810 if (!sock_flag(sk
, SOCK_USE_WRITE_QUEUE
))
811 sk
->sk_write_space(sk
);
816 * Read buffer destructor automatically called from kfree_skb.
818 void sock_rfree(struct sk_buff
*skb
)
820 struct sock
*sk
= skb
->sk
;
822 atomic_sub(skb
->truesize
, &sk
->sk_rmem_alloc
);
826 int sock_i_uid(struct sock
*sk
)
830 read_lock(&sk
->sk_callback_lock
);
831 uid
= sk
->sk_socket
? SOCK_INODE(sk
->sk_socket
)->i_uid
: 0;
832 read_unlock(&sk
->sk_callback_lock
);
836 unsigned long sock_i_ino(struct sock
*sk
)
840 read_lock(&sk
->sk_callback_lock
);
841 ino
= sk
->sk_socket
? SOCK_INODE(sk
->sk_socket
)->i_ino
: 0;
842 read_unlock(&sk
->sk_callback_lock
);
847 * Allocate a skb from the socket's send buffer.
849 struct sk_buff
*sock_wmalloc(struct sock
*sk
, unsigned long size
, int force
,
852 if (force
|| atomic_read(&sk
->sk_wmem_alloc
) < sk
->sk_sndbuf
) {
853 struct sk_buff
* skb
= alloc_skb(size
, priority
);
855 skb_set_owner_w(skb
, sk
);
863 * Allocate a skb from the socket's receive buffer.
865 struct sk_buff
*sock_rmalloc(struct sock
*sk
, unsigned long size
, int force
,
868 if (force
|| atomic_read(&sk
->sk_rmem_alloc
) < sk
->sk_rcvbuf
) {
869 struct sk_buff
*skb
= alloc_skb(size
, priority
);
871 skb_set_owner_r(skb
, sk
);
879 * Allocate a memory block from the socket's option memory buffer.
881 void *sock_kmalloc(struct sock
*sk
, int size
, gfp_t priority
)
883 if ((unsigned)size
<= sysctl_optmem_max
&&
884 atomic_read(&sk
->sk_omem_alloc
) + size
< sysctl_optmem_max
) {
886 /* First do the add, to avoid the race if kmalloc
889 atomic_add(size
, &sk
->sk_omem_alloc
);
890 mem
= kmalloc(size
, priority
);
893 atomic_sub(size
, &sk
->sk_omem_alloc
);
899 * Free an option memory block.
901 void sock_kfree_s(struct sock
*sk
, void *mem
, int size
)
904 atomic_sub(size
, &sk
->sk_omem_alloc
);
907 /* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
908 I think, these locks should be removed for datagram sockets.
910 static long sock_wait_for_wmem(struct sock
* sk
, long timeo
)
914 clear_bit(SOCK_ASYNC_NOSPACE
, &sk
->sk_socket
->flags
);
918 if (signal_pending(current
))
920 set_bit(SOCK_NOSPACE
, &sk
->sk_socket
->flags
);
921 prepare_to_wait(sk
->sk_sleep
, &wait
, TASK_INTERRUPTIBLE
);
922 if (atomic_read(&sk
->sk_wmem_alloc
) < sk
->sk_sndbuf
)
924 if (sk
->sk_shutdown
& SEND_SHUTDOWN
)
928 timeo
= schedule_timeout(timeo
);
930 finish_wait(sk
->sk_sleep
, &wait
);
936 * Generic send/receive buffer handlers
939 static struct sk_buff
*sock_alloc_send_pskb(struct sock
*sk
,
940 unsigned long header_len
,
941 unsigned long data_len
,
942 int noblock
, int *errcode
)
949 gfp_mask
= sk
->sk_allocation
;
950 if (gfp_mask
& __GFP_WAIT
)
951 gfp_mask
|= __GFP_REPEAT
;
953 timeo
= sock_sndtimeo(sk
, noblock
);
955 err
= sock_error(sk
);
960 if (sk
->sk_shutdown
& SEND_SHUTDOWN
)
963 if (atomic_read(&sk
->sk_wmem_alloc
) < sk
->sk_sndbuf
) {
964 skb
= alloc_skb(header_len
, sk
->sk_allocation
);
969 /* No pages, we're done... */
973 npages
= (data_len
+ (PAGE_SIZE
- 1)) >> PAGE_SHIFT
;
974 skb
->truesize
+= data_len
;
975 skb_shinfo(skb
)->nr_frags
= npages
;
976 for (i
= 0; i
< npages
; i
++) {
980 page
= alloc_pages(sk
->sk_allocation
, 0);
983 skb_shinfo(skb
)->nr_frags
= i
;
988 frag
= &skb_shinfo(skb
)->frags
[i
];
990 frag
->page_offset
= 0;
991 frag
->size
= (data_len
>= PAGE_SIZE
?
994 data_len
-= PAGE_SIZE
;
997 /* Full success... */
1003 set_bit(SOCK_ASYNC_NOSPACE
, &sk
->sk_socket
->flags
);
1004 set_bit(SOCK_NOSPACE
, &sk
->sk_socket
->flags
);
1008 if (signal_pending(current
))
1010 timeo
= sock_wait_for_wmem(sk
, timeo
);
1013 skb_set_owner_w(skb
, sk
);
1017 err
= sock_intr_errno(timeo
);
1023 struct sk_buff
*sock_alloc_send_skb(struct sock
*sk
, unsigned long size
,
1024 int noblock
, int *errcode
)
1026 return sock_alloc_send_pskb(sk
, size
, 0, noblock
, errcode
);
1029 static void __lock_sock(struct sock
*sk
)
1034 prepare_to_wait_exclusive(&sk
->sk_lock
.wq
, &wait
,
1035 TASK_UNINTERRUPTIBLE
);
1036 spin_unlock_bh(&sk
->sk_lock
.slock
);
1038 spin_lock_bh(&sk
->sk_lock
.slock
);
1039 if(!sock_owned_by_user(sk
))
1042 finish_wait(&sk
->sk_lock
.wq
, &wait
);
1045 static void __release_sock(struct sock
*sk
)
1047 struct sk_buff
*skb
= sk
->sk_backlog
.head
;
1050 sk
->sk_backlog
.head
= sk
->sk_backlog
.tail
= NULL
;
1054 struct sk_buff
*next
= skb
->next
;
1057 sk
->sk_backlog_rcv(sk
, skb
);
1060 * We are in process context here with softirqs
1061 * disabled, use cond_resched_softirq() to preempt.
1062 * This is safe to do because we've taken the backlog
1065 cond_resched_softirq();
1068 } while (skb
!= NULL
);
1071 } while((skb
= sk
->sk_backlog
.head
) != NULL
);
1075 * sk_wait_data - wait for data to arrive at sk_receive_queue
1076 * @sk: sock to wait on
1077 * @timeo: for how long
1079 * Now socket state including sk->sk_err is changed only under lock,
1080 * hence we may omit checks after joining wait queue.
1081 * We check receive queue before schedule() only as optimization;
1082 * it is very likely that release_sock() added new data.
1084 int sk_wait_data(struct sock
*sk
, long *timeo
)
1089 prepare_to_wait(sk
->sk_sleep
, &wait
, TASK_INTERRUPTIBLE
);
1090 set_bit(SOCK_ASYNC_WAITDATA
, &sk
->sk_socket
->flags
);
1091 rc
= sk_wait_event(sk
, timeo
, !skb_queue_empty(&sk
->sk_receive_queue
));
1092 clear_bit(SOCK_ASYNC_WAITDATA
, &sk
->sk_socket
->flags
);
1093 finish_wait(sk
->sk_sleep
, &wait
);
1097 EXPORT_SYMBOL(sk_wait_data
);
1100 * Set of default routines for initialising struct proto_ops when
1101 * the protocol does not support a particular function. In certain
1102 * cases where it makes no sense for a protocol to have a "do nothing"
1103 * function, some default processing is provided.
1106 int sock_no_bind(struct socket
*sock
, struct sockaddr
*saddr
, int len
)
1111 int sock_no_connect(struct socket
*sock
, struct sockaddr
*saddr
,
1117 int sock_no_socketpair(struct socket
*sock1
, struct socket
*sock2
)
1122 int sock_no_accept(struct socket
*sock
, struct socket
*newsock
, int flags
)
1127 int sock_no_getname(struct socket
*sock
, struct sockaddr
*saddr
,
1133 unsigned int sock_no_poll(struct file
* file
, struct socket
*sock
, poll_table
*pt
)
1138 int sock_no_ioctl(struct socket
*sock
, unsigned int cmd
, unsigned long arg
)
1143 int sock_no_listen(struct socket
*sock
, int backlog
)
1148 int sock_no_shutdown(struct socket
*sock
, int how
)
1153 int sock_no_setsockopt(struct socket
*sock
, int level
, int optname
,
1154 char __user
*optval
, int optlen
)
1159 int sock_no_getsockopt(struct socket
*sock
, int level
, int optname
,
1160 char __user
*optval
, int __user
*optlen
)
1165 int sock_no_sendmsg(struct kiocb
*iocb
, struct socket
*sock
, struct msghdr
*m
,
1171 int sock_no_recvmsg(struct kiocb
*iocb
, struct socket
*sock
, struct msghdr
*m
,
1172 size_t len
, int flags
)
1177 int sock_no_mmap(struct file
*file
, struct socket
*sock
, struct vm_area_struct
*vma
)
1179 /* Mirror missing mmap method error code */
1183 ssize_t
sock_no_sendpage(struct socket
*sock
, struct page
*page
, int offset
, size_t size
, int flags
)
1186 struct msghdr msg
= {.msg_flags
= flags
};
1188 char *kaddr
= kmap(page
);
1189 iov
.iov_base
= kaddr
+ offset
;
1191 res
= kernel_sendmsg(sock
, &msg
, &iov
, 1, size
);
1197 * Default Socket Callbacks
1200 static void sock_def_wakeup(struct sock
*sk
)
1202 read_lock(&sk
->sk_callback_lock
);
1203 if (sk
->sk_sleep
&& waitqueue_active(sk
->sk_sleep
))
1204 wake_up_interruptible_all(sk
->sk_sleep
);
1205 read_unlock(&sk
->sk_callback_lock
);
1208 static void sock_def_error_report(struct sock
*sk
)
1210 read_lock(&sk
->sk_callback_lock
);
1211 if (sk
->sk_sleep
&& waitqueue_active(sk
->sk_sleep
))
1212 wake_up_interruptible(sk
->sk_sleep
);
1213 sk_wake_async(sk
,0,POLL_ERR
);
1214 read_unlock(&sk
->sk_callback_lock
);
1217 static void sock_def_readable(struct sock
*sk
, int len
)
1219 read_lock(&sk
->sk_callback_lock
);
1220 if (sk
->sk_sleep
&& waitqueue_active(sk
->sk_sleep
))
1221 wake_up_interruptible(sk
->sk_sleep
);
1222 sk_wake_async(sk
,1,POLL_IN
);
1223 read_unlock(&sk
->sk_callback_lock
);
1226 static void sock_def_write_space(struct sock
*sk
)
1228 read_lock(&sk
->sk_callback_lock
);
1230 /* Do not wake up a writer until he can make "significant"
1233 if((atomic_read(&sk
->sk_wmem_alloc
) << 1) <= sk
->sk_sndbuf
) {
1234 if (sk
->sk_sleep
&& waitqueue_active(sk
->sk_sleep
))
1235 wake_up_interruptible(sk
->sk_sleep
);
1237 /* Should agree with poll, otherwise some programs break */
1238 if (sock_writeable(sk
))
1239 sk_wake_async(sk
, 2, POLL_OUT
);
1242 read_unlock(&sk
->sk_callback_lock
);
1245 static void sock_def_destruct(struct sock
*sk
)
1247 kfree(sk
->sk_protinfo
);
1250 void sk_send_sigurg(struct sock
*sk
)
1252 if (sk
->sk_socket
&& sk
->sk_socket
->file
)
1253 if (send_sigurg(&sk
->sk_socket
->file
->f_owner
))
1254 sk_wake_async(sk
, 3, POLL_PRI
);
1257 void sk_reset_timer(struct sock
*sk
, struct timer_list
* timer
,
1258 unsigned long expires
)
1260 if (!mod_timer(timer
, expires
))
1264 EXPORT_SYMBOL(sk_reset_timer
);
1266 void sk_stop_timer(struct sock
*sk
, struct timer_list
* timer
)
1268 if (timer_pending(timer
) && del_timer(timer
))
1272 EXPORT_SYMBOL(sk_stop_timer
);
1274 void sock_init_data(struct socket
*sock
, struct sock
*sk
)
1276 skb_queue_head_init(&sk
->sk_receive_queue
);
1277 skb_queue_head_init(&sk
->sk_write_queue
);
1278 skb_queue_head_init(&sk
->sk_error_queue
);
1280 sk
->sk_send_head
= NULL
;
1282 init_timer(&sk
->sk_timer
);
1284 sk
->sk_allocation
= GFP_KERNEL
;
1285 sk
->sk_rcvbuf
= sysctl_rmem_default
;
1286 sk
->sk_sndbuf
= sysctl_wmem_default
;
1287 sk
->sk_state
= TCP_CLOSE
;
1288 sk
->sk_socket
= sock
;
1290 sock_set_flag(sk
, SOCK_ZAPPED
);
1294 sk
->sk_type
= sock
->type
;
1295 sk
->sk_sleep
= &sock
->wait
;
1298 sk
->sk_sleep
= NULL
;
1300 rwlock_init(&sk
->sk_dst_lock
);
1301 rwlock_init(&sk
->sk_callback_lock
);
1303 sk
->sk_state_change
= sock_def_wakeup
;
1304 sk
->sk_data_ready
= sock_def_readable
;
1305 sk
->sk_write_space
= sock_def_write_space
;
1306 sk
->sk_error_report
= sock_def_error_report
;
1307 sk
->sk_destruct
= sock_def_destruct
;
1309 sk
->sk_sndmsg_page
= NULL
;
1310 sk
->sk_sndmsg_off
= 0;
1312 sk
->sk_peercred
.pid
= 0;
1313 sk
->sk_peercred
.uid
= -1;
1314 sk
->sk_peercred
.gid
= -1;
1315 sk
->sk_write_pending
= 0;
1316 sk
->sk_rcvlowat
= 1;
1317 sk
->sk_rcvtimeo
= MAX_SCHEDULE_TIMEOUT
;
1318 sk
->sk_sndtimeo
= MAX_SCHEDULE_TIMEOUT
;
1320 sk
->sk_stamp
.tv_sec
= -1L;
1321 sk
->sk_stamp
.tv_usec
= -1L;
1323 atomic_set(&sk
->sk_refcnt
, 1);
1326 void fastcall
lock_sock(struct sock
*sk
)
1329 spin_lock_bh(&(sk
->sk_lock
.slock
));
1330 if (sk
->sk_lock
.owner
)
1332 sk
->sk_lock
.owner
= (void *)1;
1333 spin_unlock_bh(&(sk
->sk_lock
.slock
));
1336 EXPORT_SYMBOL(lock_sock
);
1338 void fastcall
release_sock(struct sock
*sk
)
1340 spin_lock_bh(&(sk
->sk_lock
.slock
));
1341 if (sk
->sk_backlog
.tail
)
1343 sk
->sk_lock
.owner
= NULL
;
1344 if (waitqueue_active(&(sk
->sk_lock
.wq
)))
1345 wake_up(&(sk
->sk_lock
.wq
));
1346 spin_unlock_bh(&(sk
->sk_lock
.slock
));
1348 EXPORT_SYMBOL(release_sock
);
1350 int sock_get_timestamp(struct sock
*sk
, struct timeval __user
*userstamp
)
1352 if (!sock_flag(sk
, SOCK_TIMESTAMP
))
1353 sock_enable_timestamp(sk
);
1354 if (sk
->sk_stamp
.tv_sec
== -1)
1356 if (sk
->sk_stamp
.tv_sec
== 0)
1357 do_gettimeofday(&sk
->sk_stamp
);
1358 return copy_to_user(userstamp
, &sk
->sk_stamp
, sizeof(struct timeval
)) ?
1361 EXPORT_SYMBOL(sock_get_timestamp
);
1363 void sock_enable_timestamp(struct sock
*sk
)
1365 if (!sock_flag(sk
, SOCK_TIMESTAMP
)) {
1366 sock_set_flag(sk
, SOCK_TIMESTAMP
);
1367 net_enable_timestamp();
1370 EXPORT_SYMBOL(sock_enable_timestamp
);
1373 * Get a socket option on an socket.
1375 * FIX: POSIX 1003.1g is very ambiguous here. It states that
1376 * asynchronous errors should be reported by getsockopt. We assume
1377 * this means if you specify SO_ERROR (otherwise whats the point of it).
1379 int sock_common_getsockopt(struct socket
*sock
, int level
, int optname
,
1380 char __user
*optval
, int __user
*optlen
)
1382 struct sock
*sk
= sock
->sk
;
1384 return sk
->sk_prot
->getsockopt(sk
, level
, optname
, optval
, optlen
);
1387 EXPORT_SYMBOL(sock_common_getsockopt
);
1389 #ifdef CONFIG_COMPAT
1390 int compat_sock_common_getsockopt(struct socket
*sock
, int level
, int optname
,
1391 char __user
*optval
, int __user
*optlen
)
1393 struct sock
*sk
= sock
->sk
;
1395 if (sk
->sk_prot
->compat_setsockopt
!= NULL
)
1396 return sk
->sk_prot
->compat_getsockopt(sk
, level
, optname
,
1398 return sk
->sk_prot
->getsockopt(sk
, level
, optname
, optval
, optlen
);
1400 EXPORT_SYMBOL(compat_sock_common_getsockopt
);
1403 int sock_common_recvmsg(struct kiocb
*iocb
, struct socket
*sock
,
1404 struct msghdr
*msg
, size_t size
, int flags
)
1406 struct sock
*sk
= sock
->sk
;
1410 err
= sk
->sk_prot
->recvmsg(iocb
, sk
, msg
, size
, flags
& MSG_DONTWAIT
,
1411 flags
& ~MSG_DONTWAIT
, &addr_len
);
1413 msg
->msg_namelen
= addr_len
;
1417 EXPORT_SYMBOL(sock_common_recvmsg
);
1420 * Set socket options on an inet socket.
1422 int sock_common_setsockopt(struct socket
*sock
, int level
, int optname
,
1423 char __user
*optval
, int optlen
)
1425 struct sock
*sk
= sock
->sk
;
1427 return sk
->sk_prot
->setsockopt(sk
, level
, optname
, optval
, optlen
);
1430 EXPORT_SYMBOL(sock_common_setsockopt
);
1432 #ifdef CONFIG_COMPAT
1433 int compat_sock_common_setsockopt(struct socket
*sock
, int level
, int optname
,
1434 char __user
*optval
, int optlen
)
1436 struct sock
*sk
= sock
->sk
;
1438 if (sk
->sk_prot
->compat_setsockopt
!= NULL
)
1439 return sk
->sk_prot
->compat_setsockopt(sk
, level
, optname
,
1441 return sk
->sk_prot
->setsockopt(sk
, level
, optname
, optval
, optlen
);
1443 EXPORT_SYMBOL(compat_sock_common_setsockopt
);
1446 void sk_common_release(struct sock
*sk
)
1448 if (sk
->sk_prot
->destroy
)
1449 sk
->sk_prot
->destroy(sk
);
1452 * Observation: when sock_common_release is called, processes have
1453 * no access to socket. But net still has.
1454 * Step one, detach it from networking:
1456 * A. Remove from hash tables.
1459 sk
->sk_prot
->unhash(sk
);
1462 * In this point socket cannot receive new packets, but it is possible
1463 * that some packets are in flight because some CPU runs receiver and
1464 * did hash table lookup before we unhashed socket. They will achieve
1465 * receive queue and will be purged by socket destructor.
1467 * Also we still have packets pending on receive queue and probably,
1468 * our own packets waiting in device queues. sock_destroy will drain
1469 * receive queue, but transmitted packets will delay socket destruction
1470 * until the last reference will be released.
1475 xfrm_sk_free_policy(sk
);
1477 sk_refcnt_debug_release(sk
);
1481 EXPORT_SYMBOL(sk_common_release
);
1483 static DEFINE_RWLOCK(proto_list_lock
);
1484 static LIST_HEAD(proto_list
);
1486 int proto_register(struct proto
*prot
, int alloc_slab
)
1488 char *request_sock_slab_name
= NULL
;
1489 char *timewait_sock_slab_name
;
1493 prot
->slab
= kmem_cache_create(prot
->name
, prot
->obj_size
, 0,
1494 SLAB_HWCACHE_ALIGN
, NULL
, NULL
);
1496 if (prot
->slab
== NULL
) {
1497 printk(KERN_CRIT
"%s: Can't create sock SLAB cache!\n",
1502 if (prot
->rsk_prot
!= NULL
) {
1503 static const char mask
[] = "request_sock_%s";
1505 request_sock_slab_name
= kmalloc(strlen(prot
->name
) + sizeof(mask
) - 1, GFP_KERNEL
);
1506 if (request_sock_slab_name
== NULL
)
1507 goto out_free_sock_slab
;
1509 sprintf(request_sock_slab_name
, mask
, prot
->name
);
1510 prot
->rsk_prot
->slab
= kmem_cache_create(request_sock_slab_name
,
1511 prot
->rsk_prot
->obj_size
, 0,
1512 SLAB_HWCACHE_ALIGN
, NULL
, NULL
);
1514 if (prot
->rsk_prot
->slab
== NULL
) {
1515 printk(KERN_CRIT
"%s: Can't create request sock SLAB cache!\n",
1517 goto out_free_request_sock_slab_name
;
1521 if (prot
->twsk_prot
!= NULL
) {
1522 static const char mask
[] = "tw_sock_%s";
1524 timewait_sock_slab_name
= kmalloc(strlen(prot
->name
) + sizeof(mask
) - 1, GFP_KERNEL
);
1526 if (timewait_sock_slab_name
== NULL
)
1527 goto out_free_request_sock_slab
;
1529 sprintf(timewait_sock_slab_name
, mask
, prot
->name
);
1530 prot
->twsk_prot
->twsk_slab
=
1531 kmem_cache_create(timewait_sock_slab_name
,
1532 prot
->twsk_prot
->twsk_obj_size
,
1533 0, SLAB_HWCACHE_ALIGN
,
1535 if (prot
->twsk_prot
->twsk_slab
== NULL
)
1536 goto out_free_timewait_sock_slab_name
;
1540 write_lock(&proto_list_lock
);
1541 list_add(&prot
->node
, &proto_list
);
1542 write_unlock(&proto_list_lock
);
1546 out_free_timewait_sock_slab_name
:
1547 kfree(timewait_sock_slab_name
);
1548 out_free_request_sock_slab
:
1549 if (prot
->rsk_prot
&& prot
->rsk_prot
->slab
) {
1550 kmem_cache_destroy(prot
->rsk_prot
->slab
);
1551 prot
->rsk_prot
->slab
= NULL
;
1553 out_free_request_sock_slab_name
:
1554 kfree(request_sock_slab_name
);
1556 kmem_cache_destroy(prot
->slab
);
1561 EXPORT_SYMBOL(proto_register
);
1563 void proto_unregister(struct proto
*prot
)
1565 write_lock(&proto_list_lock
);
1566 list_del(&prot
->node
);
1567 write_unlock(&proto_list_lock
);
1569 if (prot
->slab
!= NULL
) {
1570 kmem_cache_destroy(prot
->slab
);
1574 if (prot
->rsk_prot
!= NULL
&& prot
->rsk_prot
->slab
!= NULL
) {
1575 const char *name
= kmem_cache_name(prot
->rsk_prot
->slab
);
1577 kmem_cache_destroy(prot
->rsk_prot
->slab
);
1579 prot
->rsk_prot
->slab
= NULL
;
1582 if (prot
->twsk_prot
!= NULL
&& prot
->twsk_prot
->twsk_slab
!= NULL
) {
1583 const char *name
= kmem_cache_name(prot
->twsk_prot
->twsk_slab
);
1585 kmem_cache_destroy(prot
->twsk_prot
->twsk_slab
);
1587 prot
->twsk_prot
->twsk_slab
= NULL
;
1591 EXPORT_SYMBOL(proto_unregister
);
1593 #ifdef CONFIG_PROC_FS
1594 static inline struct proto
*__proto_head(void)
1596 return list_entry(proto_list
.next
, struct proto
, node
);
1599 static inline struct proto
*proto_head(void)
1601 return list_empty(&proto_list
) ? NULL
: __proto_head();
1604 static inline struct proto
*proto_next(struct proto
*proto
)
1606 return proto
->node
.next
== &proto_list
? NULL
:
1607 list_entry(proto
->node
.next
, struct proto
, node
);
1610 static inline struct proto
*proto_get_idx(loff_t pos
)
1612 struct proto
*proto
;
1615 list_for_each_entry(proto
, &proto_list
, node
)
1624 static void *proto_seq_start(struct seq_file
*seq
, loff_t
*pos
)
1626 read_lock(&proto_list_lock
);
1627 return *pos
? proto_get_idx(*pos
- 1) : SEQ_START_TOKEN
;
1630 static void *proto_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
1633 return v
== SEQ_START_TOKEN
? proto_head() : proto_next(v
);
1636 static void proto_seq_stop(struct seq_file
*seq
, void *v
)
1638 read_unlock(&proto_list_lock
);
1641 static char proto_method_implemented(const void *method
)
1643 return method
== NULL
? 'n' : 'y';
1646 static void proto_seq_printf(struct seq_file
*seq
, struct proto
*proto
)
1648 seq_printf(seq
, "%-9s %4u %6d %6d %-3s %6u %-3s %-10s "
1649 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
1652 proto
->sockets_allocated
!= NULL
? atomic_read(proto
->sockets_allocated
) : -1,
1653 proto
->memory_allocated
!= NULL
? atomic_read(proto
->memory_allocated
) : -1,
1654 proto
->memory_pressure
!= NULL
? *proto
->memory_pressure
? "yes" : "no" : "NI",
1656 proto
->slab
== NULL
? "no" : "yes",
1657 module_name(proto
->owner
),
1658 proto_method_implemented(proto
->close
),
1659 proto_method_implemented(proto
->connect
),
1660 proto_method_implemented(proto
->disconnect
),
1661 proto_method_implemented(proto
->accept
),
1662 proto_method_implemented(proto
->ioctl
),
1663 proto_method_implemented(proto
->init
),
1664 proto_method_implemented(proto
->destroy
),
1665 proto_method_implemented(proto
->shutdown
),
1666 proto_method_implemented(proto
->setsockopt
),
1667 proto_method_implemented(proto
->getsockopt
),
1668 proto_method_implemented(proto
->sendmsg
),
1669 proto_method_implemented(proto
->recvmsg
),
1670 proto_method_implemented(proto
->sendpage
),
1671 proto_method_implemented(proto
->bind
),
1672 proto_method_implemented(proto
->backlog_rcv
),
1673 proto_method_implemented(proto
->hash
),
1674 proto_method_implemented(proto
->unhash
),
1675 proto_method_implemented(proto
->get_port
),
1676 proto_method_implemented(proto
->enter_memory_pressure
));
1679 static int proto_seq_show(struct seq_file
*seq
, void *v
)
1681 if (v
== SEQ_START_TOKEN
)
1682 seq_printf(seq
, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
1691 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
1693 proto_seq_printf(seq
, v
);
1697 static struct seq_operations proto_seq_ops
= {
1698 .start
= proto_seq_start
,
1699 .next
= proto_seq_next
,
1700 .stop
= proto_seq_stop
,
1701 .show
= proto_seq_show
,
1704 static int proto_seq_open(struct inode
*inode
, struct file
*file
)
1706 return seq_open(file
, &proto_seq_ops
);
1709 static struct file_operations proto_seq_fops
= {
1710 .owner
= THIS_MODULE
,
1711 .open
= proto_seq_open
,
1713 .llseek
= seq_lseek
,
1714 .release
= seq_release
,
1717 static int __init
proto_init(void)
1719 /* register /proc/net/protocols */
1720 return proc_net_fops_create("protocols", S_IRUGO
, &proto_seq_fops
) == NULL
? -ENOBUFS
: 0;
1723 subsys_initcall(proto_init
);
1725 #endif /* PROC_FS */
1727 EXPORT_SYMBOL(sk_alloc
);
1728 EXPORT_SYMBOL(sk_free
);
1729 EXPORT_SYMBOL(sk_send_sigurg
);
1730 EXPORT_SYMBOL(sock_alloc_send_skb
);
1731 EXPORT_SYMBOL(sock_init_data
);
1732 EXPORT_SYMBOL(sock_kfree_s
);
1733 EXPORT_SYMBOL(sock_kmalloc
);
1734 EXPORT_SYMBOL(sock_no_accept
);
1735 EXPORT_SYMBOL(sock_no_bind
);
1736 EXPORT_SYMBOL(sock_no_connect
);
1737 EXPORT_SYMBOL(sock_no_getname
);
1738 EXPORT_SYMBOL(sock_no_getsockopt
);
1739 EXPORT_SYMBOL(sock_no_ioctl
);
1740 EXPORT_SYMBOL(sock_no_listen
);
1741 EXPORT_SYMBOL(sock_no_mmap
);
1742 EXPORT_SYMBOL(sock_no_poll
);
1743 EXPORT_SYMBOL(sock_no_recvmsg
);
1744 EXPORT_SYMBOL(sock_no_sendmsg
);
1745 EXPORT_SYMBOL(sock_no_sendpage
);
1746 EXPORT_SYMBOL(sock_no_setsockopt
);
1747 EXPORT_SYMBOL(sock_no_shutdown
);
1748 EXPORT_SYMBOL(sock_no_socketpair
);
1749 EXPORT_SYMBOL(sock_rfree
);
1750 EXPORT_SYMBOL(sock_setsockopt
);
1751 EXPORT_SYMBOL(sock_wfree
);
1752 EXPORT_SYMBOL(sock_wmalloc
);
1753 EXPORT_SYMBOL(sock_i_uid
);
1754 EXPORT_SYMBOL(sock_i_ino
);
1755 EXPORT_SYMBOL(sysctl_optmem_max
);
1756 #ifdef CONFIG_SYSCTL
1757 EXPORT_SYMBOL(sysctl_rmem_max
);
1758 EXPORT_SYMBOL(sysctl_wmem_max
);