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 $
12 * Authors: Ross Biro, <bir7@leland.Stanford.Edu>
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/config.h>
95 #include <linux/errno.h>
96 #include <linux/types.h>
97 #include <linux/socket.h>
99 #include <linux/kernel.h>
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>
115 #include <asm/uaccess.h>
116 #include <asm/system.h>
118 #include <linux/netdevice.h>
119 #include <net/protocol.h>
120 #include <linux/skbuff.h>
121 #include <net/sock.h>
122 #include <net/xfrm.h>
123 #include <linux/ipsec.h>
125 #include <linux/filter.h>
131 /* Take into consideration the size of the struct sk_buff overhead in the
132 * determination of these values, since that is non-constant across
133 * platforms. This makes socket queueing behavior and performance
134 * not depend upon such differences.
136 #define _SK_MEM_PACKETS 256
137 #define _SK_MEM_OVERHEAD (sizeof(struct sk_buff) + 256)
138 #define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
139 #define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
141 /* Run time adjustable parameters. */
142 __u32 sysctl_wmem_max
= SK_WMEM_MAX
;
143 __u32 sysctl_rmem_max
= SK_RMEM_MAX
;
144 __u32 sysctl_wmem_default
= SK_WMEM_MAX
;
145 __u32 sysctl_rmem_default
= SK_RMEM_MAX
;
147 /* Maximal space eaten by iovec or ancilliary data plus some space */
148 int sysctl_optmem_max
= sizeof(unsigned long)*(2*UIO_MAXIOV
+ 512);
150 static int sock_set_timeout(long *timeo_p
, char __user
*optval
, int optlen
)
154 if (optlen
< sizeof(tv
))
156 if (copy_from_user(&tv
, optval
, sizeof(tv
)))
159 *timeo_p
= MAX_SCHEDULE_TIMEOUT
;
160 if (tv
.tv_sec
== 0 && tv
.tv_usec
== 0)
162 if (tv
.tv_sec
< (MAX_SCHEDULE_TIMEOUT
/HZ
- 1))
163 *timeo_p
= tv
.tv_sec
*HZ
+ (tv
.tv_usec
+(1000000/HZ
-1))/(1000000/HZ
);
167 static void sock_warn_obsolete_bsdism(const char *name
)
170 static char warncomm
[TASK_COMM_LEN
];
171 if (strcmp(warncomm
, current
->comm
) && warned
< 5) {
172 strcpy(warncomm
, current
->comm
);
173 printk(KERN_WARNING
"process `%s' is using obsolete "
174 "%s SO_BSDCOMPAT\n", warncomm
, name
);
179 static void sock_disable_timestamp(struct sock
*sk
)
181 if (sock_flag(sk
, SOCK_TIMESTAMP
)) {
182 sock_reset_flag(sk
, SOCK_TIMESTAMP
);
183 net_disable_timestamp();
189 * This is meant for all protocols to use and covers goings on
190 * at the socket level. Everything here is generic.
193 int sock_setsockopt(struct socket
*sock
, int level
, int optname
,
194 char __user
*optval
, int optlen
)
196 struct sock
*sk
=sock
->sk
;
197 struct sk_filter
*filter
;
204 * Options without arguments
207 #ifdef SO_DONTLINGER /* Compatibility item... */
210 sock_reset_flag(sk
, SOCK_LINGER
);
215 if(optlen
<sizeof(int))
218 if (get_user(val
, (int __user
*)optval
))
228 if(val
&& !capable(CAP_NET_ADMIN
))
233 sock_set_flag(sk
, SOCK_DBG
);
235 sock_reset_flag(sk
, SOCK_DBG
);
238 sk
->sk_reuse
= valbool
;
246 sock_set_flag(sk
, SOCK_LOCALROUTE
);
248 sock_reset_flag(sk
, SOCK_LOCALROUTE
);
251 sock_valbool_flag(sk
, SOCK_BROADCAST
, valbool
);
254 /* Don't error on this BSD doesn't and if you think
255 about it this is right. Otherwise apps have to
256 play 'guess the biggest size' games. RCVBUF/SNDBUF
257 are treated in BSD as hints */
259 if (val
> sysctl_wmem_max
)
260 val
= sysctl_wmem_max
;
262 sk
->sk_userlocks
|= SOCK_SNDBUF_LOCK
;
263 if ((val
* 2) < SOCK_MIN_SNDBUF
)
264 sk
->sk_sndbuf
= SOCK_MIN_SNDBUF
;
266 sk
->sk_sndbuf
= val
* 2;
269 * Wake up sending tasks if we
272 sk
->sk_write_space(sk
);
276 /* Don't error on this BSD doesn't and if you think
277 about it this is right. Otherwise apps have to
278 play 'guess the biggest size' games. RCVBUF/SNDBUF
279 are treated in BSD as hints */
281 if (val
> sysctl_rmem_max
)
282 val
= sysctl_rmem_max
;
284 sk
->sk_userlocks
|= SOCK_RCVBUF_LOCK
;
285 /* FIXME: is this lower bound the right one? */
286 if ((val
* 2) < SOCK_MIN_RCVBUF
)
287 sk
->sk_rcvbuf
= SOCK_MIN_RCVBUF
;
289 sk
->sk_rcvbuf
= val
* 2;
294 if (sk
->sk_protocol
== IPPROTO_TCP
)
295 tcp_set_keepalive(sk
, valbool
);
297 sock_valbool_flag(sk
, SOCK_KEEPOPEN
, valbool
);
301 sock_valbool_flag(sk
, SOCK_URGINLINE
, valbool
);
305 sk
->sk_no_check
= valbool
;
309 if ((val
>= 0 && val
<= 6) || capable(CAP_NET_ADMIN
))
310 sk
->sk_priority
= val
;
316 if(optlen
<sizeof(ling
)) {
317 ret
= -EINVAL
; /* 1003.1g */
320 if (copy_from_user(&ling
,optval
,sizeof(ling
))) {
325 sock_reset_flag(sk
, SOCK_LINGER
);
327 #if (BITS_PER_LONG == 32)
328 if (ling
.l_linger
>= MAX_SCHEDULE_TIMEOUT
/HZ
)
329 sk
->sk_lingertime
= MAX_SCHEDULE_TIMEOUT
;
332 sk
->sk_lingertime
= ling
.l_linger
* HZ
;
333 sock_set_flag(sk
, SOCK_LINGER
);
338 sock_warn_obsolete_bsdism("setsockopt");
343 set_bit(SOCK_PASSCRED
, &sock
->flags
);
345 clear_bit(SOCK_PASSCRED
, &sock
->flags
);
350 sock_set_flag(sk
, SOCK_RCVTSTAMP
);
351 sock_enable_timestamp(sk
);
353 sock_reset_flag(sk
, SOCK_RCVTSTAMP
);
359 sk
->sk_rcvlowat
= val
? : 1;
363 ret
= sock_set_timeout(&sk
->sk_rcvtimeo
, optval
, optlen
);
367 ret
= sock_set_timeout(&sk
->sk_sndtimeo
, optval
, optlen
);
370 #ifdef CONFIG_NETDEVICES
371 case SO_BINDTODEVICE
:
373 char devname
[IFNAMSIZ
];
376 if (!capable(CAP_NET_RAW
)) {
381 /* Bind this socket to a particular device like "eth0",
382 * as specified in the passed interface name. If the
383 * name is "" or the option length is zero the socket
388 sk
->sk_bound_dev_if
= 0;
390 if (optlen
> IFNAMSIZ
)
392 if (copy_from_user(devname
, optval
, optlen
)) {
397 /* Remove any cached route for this socket. */
400 if (devname
[0] == '\0') {
401 sk
->sk_bound_dev_if
= 0;
403 struct net_device
*dev
= dev_get_by_name(devname
);
408 sk
->sk_bound_dev_if
= dev
->ifindex
;
417 case SO_ATTACH_FILTER
:
419 if (optlen
== sizeof(struct sock_fprog
)) {
420 struct sock_fprog fprog
;
423 if (copy_from_user(&fprog
, optval
, sizeof(fprog
)))
426 ret
= sk_attach_filter(&fprog
, sk
);
430 case SO_DETACH_FILTER
:
431 spin_lock_bh(&sk
->sk_lock
.slock
);
432 filter
= sk
->sk_filter
;
434 sk
->sk_filter
= NULL
;
435 spin_unlock_bh(&sk
->sk_lock
.slock
);
436 sk_filter_release(sk
, filter
);
439 spin_unlock_bh(&sk
->sk_lock
.slock
);
443 /* We implement the SO_SNDLOWAT etc to
444 not be settable (1003.1g 5.3) */
454 int sock_getsockopt(struct socket
*sock
, int level
, int optname
,
455 char __user
*optval
, int __user
*optlen
)
457 struct sock
*sk
= sock
->sk
;
466 unsigned int lv
= sizeof(int);
469 if(get_user(len
,optlen
))
477 v
.val
= sock_flag(sk
, SOCK_DBG
);
481 v
.val
= sock_flag(sk
, SOCK_LOCALROUTE
);
485 v
.val
= !!sock_flag(sk
, SOCK_BROADCAST
);
489 v
.val
= sk
->sk_sndbuf
;
493 v
.val
= sk
->sk_rcvbuf
;
497 v
.val
= sk
->sk_reuse
;
501 v
.val
= !!sock_flag(sk
, SOCK_KEEPOPEN
);
509 v
.val
= -sock_error(sk
);
511 v
.val
= xchg(&sk
->sk_err_soft
, 0);
515 v
.val
= !!sock_flag(sk
, SOCK_URGINLINE
);
519 v
.val
= sk
->sk_no_check
;
523 v
.val
= sk
->sk_priority
;
528 v
.ling
.l_onoff
= !!sock_flag(sk
, SOCK_LINGER
);
529 v
.ling
.l_linger
= sk
->sk_lingertime
/ HZ
;
533 sock_warn_obsolete_bsdism("getsockopt");
537 v
.val
= sock_flag(sk
, SOCK_RCVTSTAMP
);
541 lv
=sizeof(struct timeval
);
542 if (sk
->sk_rcvtimeo
== MAX_SCHEDULE_TIMEOUT
) {
546 v
.tm
.tv_sec
= sk
->sk_rcvtimeo
/ HZ
;
547 v
.tm
.tv_usec
= ((sk
->sk_rcvtimeo
% HZ
) * 1000000) / HZ
;
552 lv
=sizeof(struct timeval
);
553 if (sk
->sk_sndtimeo
== MAX_SCHEDULE_TIMEOUT
) {
557 v
.tm
.tv_sec
= sk
->sk_sndtimeo
/ HZ
;
558 v
.tm
.tv_usec
= ((sk
->sk_sndtimeo
% HZ
) * 1000000) / HZ
;
563 v
.val
= sk
->sk_rcvlowat
;
571 v
.val
= test_bit(SOCK_PASSCRED
, &sock
->flags
) ? 1 : 0;
575 if (len
> sizeof(sk
->sk_peercred
))
576 len
= sizeof(sk
->sk_peercred
);
577 if (copy_to_user(optval
, &sk
->sk_peercred
, len
))
585 if (sock
->ops
->getname(sock
, (struct sockaddr
*)address
, &lv
, 2))
589 if (copy_to_user(optval
, address
, len
))
594 /* Dubious BSD thing... Probably nobody even uses it, but
595 * the UNIX standard wants it for whatever reason... -DaveM
598 v
.val
= sk
->sk_state
== TCP_LISTEN
;
602 return security_socket_getpeersec(sock
, optval
, optlen
, len
);
605 return(-ENOPROTOOPT
);
609 if (copy_to_user(optval
, &v
, len
))
612 if (put_user(len
, optlen
))
618 * sk_alloc - All socket objects are allocated here
619 * @family - protocol family
620 * @priority - for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
621 * @prot - struct proto associated with this new sock instance
622 * @zero_it - if we should zero the newly allocated sock
624 struct sock
*sk_alloc(int family
, int priority
, struct proto
*prot
, int zero_it
)
626 struct sock
*sk
= NULL
;
627 kmem_cache_t
*slab
= prot
->slab
;
630 sk
= kmem_cache_alloc(slab
, priority
);
632 sk
= kmalloc(prot
->obj_size
, priority
);
636 memset(sk
, 0, prot
->obj_size
);
637 sk
->sk_family
= family
;
642 if (security_sk_alloc(sk
, family
, priority
)) {
644 kmem_cache_free(slab
, sk
);
649 __module_get(prot
->owner
);
654 void sk_free(struct sock
*sk
)
656 struct sk_filter
*filter
;
657 struct module
*owner
= sk
->sk_prot
->owner
;
662 filter
= sk
->sk_filter
;
664 sk_filter_release(sk
, filter
);
665 sk
->sk_filter
= NULL
;
668 sock_disable_timestamp(sk
);
670 if (atomic_read(&sk
->sk_omem_alloc
))
671 printk(KERN_DEBUG
"%s: optmem leakage (%d bytes) detected.\n",
672 __FUNCTION__
, atomic_read(&sk
->sk_omem_alloc
));
674 security_sk_free(sk
);
675 if (sk
->sk_prot
->slab
!= NULL
)
676 kmem_cache_free(sk
->sk_prot
->slab
, sk
);
682 void __init
sk_init(void)
684 if (num_physpages
<= 4096) {
685 sysctl_wmem_max
= 32767;
686 sysctl_rmem_max
= 32767;
687 sysctl_wmem_default
= 32767;
688 sysctl_rmem_default
= 32767;
689 } else if (num_physpages
>= 131072) {
690 sysctl_wmem_max
= 131071;
691 sysctl_rmem_max
= 131071;
696 * Simple resource managers for sockets.
701 * Write buffer destructor automatically called from kfree_skb.
703 void sock_wfree(struct sk_buff
*skb
)
705 struct sock
*sk
= skb
->sk
;
707 /* In case it might be waiting for more memory. */
708 atomic_sub(skb
->truesize
, &sk
->sk_wmem_alloc
);
709 if (!sock_flag(sk
, SOCK_USE_WRITE_QUEUE
))
710 sk
->sk_write_space(sk
);
715 * Read buffer destructor automatically called from kfree_skb.
717 void sock_rfree(struct sk_buff
*skb
)
719 struct sock
*sk
= skb
->sk
;
721 atomic_sub(skb
->truesize
, &sk
->sk_rmem_alloc
);
725 int sock_i_uid(struct sock
*sk
)
729 read_lock(&sk
->sk_callback_lock
);
730 uid
= sk
->sk_socket
? SOCK_INODE(sk
->sk_socket
)->i_uid
: 0;
731 read_unlock(&sk
->sk_callback_lock
);
735 unsigned long sock_i_ino(struct sock
*sk
)
739 read_lock(&sk
->sk_callback_lock
);
740 ino
= sk
->sk_socket
? SOCK_INODE(sk
->sk_socket
)->i_ino
: 0;
741 read_unlock(&sk
->sk_callback_lock
);
746 * Allocate a skb from the socket's send buffer.
748 struct sk_buff
*sock_wmalloc(struct sock
*sk
, unsigned long size
, int force
, int priority
)
750 if (force
|| atomic_read(&sk
->sk_wmem_alloc
) < sk
->sk_sndbuf
) {
751 struct sk_buff
* skb
= alloc_skb(size
, priority
);
753 skb_set_owner_w(skb
, sk
);
761 * Allocate a skb from the socket's receive buffer.
763 struct sk_buff
*sock_rmalloc(struct sock
*sk
, unsigned long size
, int force
, int priority
)
765 if (force
|| atomic_read(&sk
->sk_rmem_alloc
) < sk
->sk_rcvbuf
) {
766 struct sk_buff
*skb
= alloc_skb(size
, priority
);
768 skb_set_owner_r(skb
, sk
);
776 * Allocate a memory block from the socket's option memory buffer.
778 void *sock_kmalloc(struct sock
*sk
, int size
, int priority
)
780 if ((unsigned)size
<= sysctl_optmem_max
&&
781 atomic_read(&sk
->sk_omem_alloc
) + size
< sysctl_optmem_max
) {
783 /* First do the add, to avoid the race if kmalloc
786 atomic_add(size
, &sk
->sk_omem_alloc
);
787 mem
= kmalloc(size
, priority
);
790 atomic_sub(size
, &sk
->sk_omem_alloc
);
796 * Free an option memory block.
798 void sock_kfree_s(struct sock
*sk
, void *mem
, int size
)
801 atomic_sub(size
, &sk
->sk_omem_alloc
);
804 /* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
805 I think, these locks should be removed for datagram sockets.
807 static long sock_wait_for_wmem(struct sock
* sk
, long timeo
)
811 clear_bit(SOCK_ASYNC_NOSPACE
, &sk
->sk_socket
->flags
);
815 if (signal_pending(current
))
817 set_bit(SOCK_NOSPACE
, &sk
->sk_socket
->flags
);
818 prepare_to_wait(sk
->sk_sleep
, &wait
, TASK_INTERRUPTIBLE
);
819 if (atomic_read(&sk
->sk_wmem_alloc
) < sk
->sk_sndbuf
)
821 if (sk
->sk_shutdown
& SEND_SHUTDOWN
)
825 timeo
= schedule_timeout(timeo
);
827 finish_wait(sk
->sk_sleep
, &wait
);
833 * Generic send/receive buffer handlers
836 static struct sk_buff
*sock_alloc_send_pskb(struct sock
*sk
,
837 unsigned long header_len
,
838 unsigned long data_len
,
839 int noblock
, int *errcode
)
842 unsigned int gfp_mask
;
846 gfp_mask
= sk
->sk_allocation
;
847 if (gfp_mask
& __GFP_WAIT
)
848 gfp_mask
|= __GFP_REPEAT
;
850 timeo
= sock_sndtimeo(sk
, noblock
);
852 err
= sock_error(sk
);
857 if (sk
->sk_shutdown
& SEND_SHUTDOWN
)
860 if (atomic_read(&sk
->sk_wmem_alloc
) < sk
->sk_sndbuf
) {
861 skb
= alloc_skb(header_len
, sk
->sk_allocation
);
866 /* No pages, we're done... */
870 npages
= (data_len
+ (PAGE_SIZE
- 1)) >> PAGE_SHIFT
;
871 skb
->truesize
+= data_len
;
872 skb_shinfo(skb
)->nr_frags
= npages
;
873 for (i
= 0; i
< npages
; i
++) {
877 page
= alloc_pages(sk
->sk_allocation
, 0);
880 skb_shinfo(skb
)->nr_frags
= i
;
885 frag
= &skb_shinfo(skb
)->frags
[i
];
887 frag
->page_offset
= 0;
888 frag
->size
= (data_len
>= PAGE_SIZE
?
891 data_len
-= PAGE_SIZE
;
894 /* Full success... */
900 set_bit(SOCK_ASYNC_NOSPACE
, &sk
->sk_socket
->flags
);
901 set_bit(SOCK_NOSPACE
, &sk
->sk_socket
->flags
);
905 if (signal_pending(current
))
907 timeo
= sock_wait_for_wmem(sk
, timeo
);
910 skb_set_owner_w(skb
, sk
);
914 err
= sock_intr_errno(timeo
);
920 struct sk_buff
*sock_alloc_send_skb(struct sock
*sk
, unsigned long size
,
921 int noblock
, int *errcode
)
923 return sock_alloc_send_pskb(sk
, size
, 0, noblock
, errcode
);
926 static void __lock_sock(struct sock
*sk
)
931 prepare_to_wait_exclusive(&sk
->sk_lock
.wq
, &wait
,
932 TASK_UNINTERRUPTIBLE
);
933 spin_unlock_bh(&sk
->sk_lock
.slock
);
935 spin_lock_bh(&sk
->sk_lock
.slock
);
936 if(!sock_owned_by_user(sk
))
939 finish_wait(&sk
->sk_lock
.wq
, &wait
);
942 static void __release_sock(struct sock
*sk
)
944 struct sk_buff
*skb
= sk
->sk_backlog
.head
;
947 sk
->sk_backlog
.head
= sk
->sk_backlog
.tail
= NULL
;
951 struct sk_buff
*next
= skb
->next
;
954 sk
->sk_backlog_rcv(sk
, skb
);
957 * We are in process context here with softirqs
958 * disabled, use cond_resched_softirq() to preempt.
959 * This is safe to do because we've taken the backlog
962 cond_resched_softirq();
965 } while (skb
!= NULL
);
968 } while((skb
= sk
->sk_backlog
.head
) != NULL
);
972 * sk_wait_data - wait for data to arrive at sk_receive_queue
973 * sk - sock to wait on
974 * timeo - for how long
976 * Now socket state including sk->sk_err is changed only under lock,
977 * hence we may omit checks after joining wait queue.
978 * We check receive queue before schedule() only as optimization;
979 * it is very likely that release_sock() added new data.
981 int sk_wait_data(struct sock
*sk
, long *timeo
)
986 prepare_to_wait(sk
->sk_sleep
, &wait
, TASK_INTERRUPTIBLE
);
987 set_bit(SOCK_ASYNC_WAITDATA
, &sk
->sk_socket
->flags
);
988 rc
= sk_wait_event(sk
, timeo
, !skb_queue_empty(&sk
->sk_receive_queue
));
989 clear_bit(SOCK_ASYNC_WAITDATA
, &sk
->sk_socket
->flags
);
990 finish_wait(sk
->sk_sleep
, &wait
);
994 EXPORT_SYMBOL(sk_wait_data
);
997 * Set of default routines for initialising struct proto_ops when
998 * the protocol does not support a particular function. In certain
999 * cases where it makes no sense for a protocol to have a "do nothing"
1000 * function, some default processing is provided.
1003 int sock_no_bind(struct socket
*sock
, struct sockaddr
*saddr
, int len
)
1008 int sock_no_connect(struct socket
*sock
, struct sockaddr
*saddr
,
1014 int sock_no_socketpair(struct socket
*sock1
, struct socket
*sock2
)
1019 int sock_no_accept(struct socket
*sock
, struct socket
*newsock
, int flags
)
1024 int sock_no_getname(struct socket
*sock
, struct sockaddr
*saddr
,
1030 unsigned int sock_no_poll(struct file
* file
, struct socket
*sock
, poll_table
*pt
)
1035 int sock_no_ioctl(struct socket
*sock
, unsigned int cmd
, unsigned long arg
)
1040 int sock_no_listen(struct socket
*sock
, int backlog
)
1045 int sock_no_shutdown(struct socket
*sock
, int how
)
1050 int sock_no_setsockopt(struct socket
*sock
, int level
, int optname
,
1051 char __user
*optval
, int optlen
)
1056 int sock_no_getsockopt(struct socket
*sock
, int level
, int optname
,
1057 char __user
*optval
, int __user
*optlen
)
1062 int sock_no_sendmsg(struct kiocb
*iocb
, struct socket
*sock
, struct msghdr
*m
,
1068 int sock_no_recvmsg(struct kiocb
*iocb
, struct socket
*sock
, struct msghdr
*m
,
1069 size_t len
, int flags
)
1074 int sock_no_mmap(struct file
*file
, struct socket
*sock
, struct vm_area_struct
*vma
)
1076 /* Mirror missing mmap method error code */
1080 ssize_t
sock_no_sendpage(struct socket
*sock
, struct page
*page
, int offset
, size_t size
, int flags
)
1083 struct msghdr msg
= {.msg_flags
= flags
};
1085 char *kaddr
= kmap(page
);
1086 iov
.iov_base
= kaddr
+ offset
;
1088 res
= kernel_sendmsg(sock
, &msg
, &iov
, 1, size
);
1094 * Default Socket Callbacks
1097 static void sock_def_wakeup(struct sock
*sk
)
1099 read_lock(&sk
->sk_callback_lock
);
1100 if (sk
->sk_sleep
&& waitqueue_active(sk
->sk_sleep
))
1101 wake_up_interruptible_all(sk
->sk_sleep
);
1102 read_unlock(&sk
->sk_callback_lock
);
1105 static void sock_def_error_report(struct sock
*sk
)
1107 read_lock(&sk
->sk_callback_lock
);
1108 if (sk
->sk_sleep
&& waitqueue_active(sk
->sk_sleep
))
1109 wake_up_interruptible(sk
->sk_sleep
);
1110 sk_wake_async(sk
,0,POLL_ERR
);
1111 read_unlock(&sk
->sk_callback_lock
);
1114 static void sock_def_readable(struct sock
*sk
, int len
)
1116 read_lock(&sk
->sk_callback_lock
);
1117 if (sk
->sk_sleep
&& waitqueue_active(sk
->sk_sleep
))
1118 wake_up_interruptible(sk
->sk_sleep
);
1119 sk_wake_async(sk
,1,POLL_IN
);
1120 read_unlock(&sk
->sk_callback_lock
);
1123 static void sock_def_write_space(struct sock
*sk
)
1125 read_lock(&sk
->sk_callback_lock
);
1127 /* Do not wake up a writer until he can make "significant"
1130 if((atomic_read(&sk
->sk_wmem_alloc
) << 1) <= sk
->sk_sndbuf
) {
1131 if (sk
->sk_sleep
&& waitqueue_active(sk
->sk_sleep
))
1132 wake_up_interruptible(sk
->sk_sleep
);
1134 /* Should agree with poll, otherwise some programs break */
1135 if (sock_writeable(sk
))
1136 sk_wake_async(sk
, 2, POLL_OUT
);
1139 read_unlock(&sk
->sk_callback_lock
);
1142 static void sock_def_destruct(struct sock
*sk
)
1144 if (sk
->sk_protinfo
)
1145 kfree(sk
->sk_protinfo
);
1148 void sk_send_sigurg(struct sock
*sk
)
1150 if (sk
->sk_socket
&& sk
->sk_socket
->file
)
1151 if (send_sigurg(&sk
->sk_socket
->file
->f_owner
))
1152 sk_wake_async(sk
, 3, POLL_PRI
);
1155 void sk_reset_timer(struct sock
*sk
, struct timer_list
* timer
,
1156 unsigned long expires
)
1158 if (!mod_timer(timer
, expires
))
1162 EXPORT_SYMBOL(sk_reset_timer
);
1164 void sk_stop_timer(struct sock
*sk
, struct timer_list
* timer
)
1166 if (timer_pending(timer
) && del_timer(timer
))
1170 EXPORT_SYMBOL(sk_stop_timer
);
1172 void sock_init_data(struct socket
*sock
, struct sock
*sk
)
1174 skb_queue_head_init(&sk
->sk_receive_queue
);
1175 skb_queue_head_init(&sk
->sk_write_queue
);
1176 skb_queue_head_init(&sk
->sk_error_queue
);
1178 sk
->sk_send_head
= NULL
;
1180 init_timer(&sk
->sk_timer
);
1182 sk
->sk_allocation
= GFP_KERNEL
;
1183 sk
->sk_rcvbuf
= sysctl_rmem_default
;
1184 sk
->sk_sndbuf
= sysctl_wmem_default
;
1185 sk
->sk_state
= TCP_CLOSE
;
1186 sk
->sk_socket
= sock
;
1188 sock_set_flag(sk
, SOCK_ZAPPED
);
1192 sk
->sk_type
= sock
->type
;
1193 sk
->sk_sleep
= &sock
->wait
;
1196 sk
->sk_sleep
= NULL
;
1198 rwlock_init(&sk
->sk_dst_lock
);
1199 rwlock_init(&sk
->sk_callback_lock
);
1201 sk
->sk_state_change
= sock_def_wakeup
;
1202 sk
->sk_data_ready
= sock_def_readable
;
1203 sk
->sk_write_space
= sock_def_write_space
;
1204 sk
->sk_error_report
= sock_def_error_report
;
1205 sk
->sk_destruct
= sock_def_destruct
;
1207 sk
->sk_sndmsg_page
= NULL
;
1208 sk
->sk_sndmsg_off
= 0;
1210 sk
->sk_peercred
.pid
= 0;
1211 sk
->sk_peercred
.uid
= -1;
1212 sk
->sk_peercred
.gid
= -1;
1213 sk
->sk_write_pending
= 0;
1214 sk
->sk_rcvlowat
= 1;
1215 sk
->sk_rcvtimeo
= MAX_SCHEDULE_TIMEOUT
;
1216 sk
->sk_sndtimeo
= MAX_SCHEDULE_TIMEOUT
;
1218 sk
->sk_stamp
.tv_sec
= -1L;
1219 sk
->sk_stamp
.tv_usec
= -1L;
1221 atomic_set(&sk
->sk_refcnt
, 1);
1224 void fastcall
lock_sock(struct sock
*sk
)
1227 spin_lock_bh(&(sk
->sk_lock
.slock
));
1228 if (sk
->sk_lock
.owner
)
1230 sk
->sk_lock
.owner
= (void *)1;
1231 spin_unlock_bh(&(sk
->sk_lock
.slock
));
1234 EXPORT_SYMBOL(lock_sock
);
1236 void fastcall
release_sock(struct sock
*sk
)
1238 spin_lock_bh(&(sk
->sk_lock
.slock
));
1239 if (sk
->sk_backlog
.tail
)
1241 sk
->sk_lock
.owner
= NULL
;
1242 if (waitqueue_active(&(sk
->sk_lock
.wq
)))
1243 wake_up(&(sk
->sk_lock
.wq
));
1244 spin_unlock_bh(&(sk
->sk_lock
.slock
));
1246 EXPORT_SYMBOL(release_sock
);
1248 int sock_get_timestamp(struct sock
*sk
, struct timeval __user
*userstamp
)
1250 if (!sock_flag(sk
, SOCK_TIMESTAMP
))
1251 sock_enable_timestamp(sk
);
1252 if (sk
->sk_stamp
.tv_sec
== -1)
1254 if (sk
->sk_stamp
.tv_sec
== 0)
1255 do_gettimeofday(&sk
->sk_stamp
);
1256 return copy_to_user(userstamp
, &sk
->sk_stamp
, sizeof(struct timeval
)) ?
1259 EXPORT_SYMBOL(sock_get_timestamp
);
1261 void sock_enable_timestamp(struct sock
*sk
)
1263 if (!sock_flag(sk
, SOCK_TIMESTAMP
)) {
1264 sock_set_flag(sk
, SOCK_TIMESTAMP
);
1265 net_enable_timestamp();
1268 EXPORT_SYMBOL(sock_enable_timestamp
);
1271 * Get a socket option on an socket.
1273 * FIX: POSIX 1003.1g is very ambiguous here. It states that
1274 * asynchronous errors should be reported by getsockopt. We assume
1275 * this means if you specify SO_ERROR (otherwise whats the point of it).
1277 int sock_common_getsockopt(struct socket
*sock
, int level
, int optname
,
1278 char __user
*optval
, int __user
*optlen
)
1280 struct sock
*sk
= sock
->sk
;
1282 return sk
->sk_prot
->getsockopt(sk
, level
, optname
, optval
, optlen
);
1285 EXPORT_SYMBOL(sock_common_getsockopt
);
1287 int sock_common_recvmsg(struct kiocb
*iocb
, struct socket
*sock
,
1288 struct msghdr
*msg
, size_t size
, int flags
)
1290 struct sock
*sk
= sock
->sk
;
1294 err
= sk
->sk_prot
->recvmsg(iocb
, sk
, msg
, size
, flags
& MSG_DONTWAIT
,
1295 flags
& ~MSG_DONTWAIT
, &addr_len
);
1297 msg
->msg_namelen
= addr_len
;
1301 EXPORT_SYMBOL(sock_common_recvmsg
);
1304 * Set socket options on an inet socket.
1306 int sock_common_setsockopt(struct socket
*sock
, int level
, int optname
,
1307 char __user
*optval
, int optlen
)
1309 struct sock
*sk
= sock
->sk
;
1311 return sk
->sk_prot
->setsockopt(sk
, level
, optname
, optval
, optlen
);
1314 EXPORT_SYMBOL(sock_common_setsockopt
);
1316 void sk_common_release(struct sock
*sk
)
1318 if (sk
->sk_prot
->destroy
)
1319 sk
->sk_prot
->destroy(sk
);
1322 * Observation: when sock_common_release is called, processes have
1323 * no access to socket. But net still has.
1324 * Step one, detach it from networking:
1326 * A. Remove from hash tables.
1329 sk
->sk_prot
->unhash(sk
);
1332 * In this point socket cannot receive new packets, but it is possible
1333 * that some packets are in flight because some CPU runs receiver and
1334 * did hash table lookup before we unhashed socket. They will achieve
1335 * receive queue and will be purged by socket destructor.
1337 * Also we still have packets pending on receive queue and probably,
1338 * our own packets waiting in device queues. sock_destroy will drain
1339 * receive queue, but transmitted packets will delay socket destruction
1340 * until the last reference will be released.
1345 xfrm_sk_free_policy(sk
);
1347 #ifdef INET_REFCNT_DEBUG
1348 if (atomic_read(&sk
->sk_refcnt
) != 1)
1349 printk(KERN_DEBUG
"Destruction of the socket %p delayed, c=%d\n",
1350 sk
, atomic_read(&sk
->sk_refcnt
));
1355 EXPORT_SYMBOL(sk_common_release
);
1357 static DEFINE_RWLOCK(proto_list_lock
);
1358 static LIST_HEAD(proto_list
);
1360 int proto_register(struct proto
*prot
, int alloc_slab
)
1365 prot
->slab
= kmem_cache_create(prot
->name
, prot
->obj_size
, 0,
1366 SLAB_HWCACHE_ALIGN
, NULL
, NULL
);
1368 if (prot
->slab
== NULL
) {
1369 printk(KERN_CRIT
"%s: Can't create sock SLAB cache!\n",
1375 write_lock(&proto_list_lock
);
1376 list_add(&prot
->node
, &proto_list
);
1377 write_unlock(&proto_list_lock
);
1383 EXPORT_SYMBOL(proto_register
);
1385 void proto_unregister(struct proto
*prot
)
1387 write_lock(&proto_list_lock
);
1389 if (prot
->slab
!= NULL
) {
1390 kmem_cache_destroy(prot
->slab
);
1394 list_del(&prot
->node
);
1395 write_unlock(&proto_list_lock
);
1398 EXPORT_SYMBOL(proto_unregister
);
1400 #ifdef CONFIG_PROC_FS
1401 static inline struct proto
*__proto_head(void)
1403 return list_entry(proto_list
.next
, struct proto
, node
);
1406 static inline struct proto
*proto_head(void)
1408 return list_empty(&proto_list
) ? NULL
: __proto_head();
1411 static inline struct proto
*proto_next(struct proto
*proto
)
1413 return proto
->node
.next
== &proto_list
? NULL
:
1414 list_entry(proto
->node
.next
, struct proto
, node
);
1417 static inline struct proto
*proto_get_idx(loff_t pos
)
1419 struct proto
*proto
;
1422 list_for_each_entry(proto
, &proto_list
, node
)
1431 static void *proto_seq_start(struct seq_file
*seq
, loff_t
*pos
)
1433 read_lock(&proto_list_lock
);
1434 return *pos
? proto_get_idx(*pos
- 1) : SEQ_START_TOKEN
;
1437 static void *proto_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
1440 return v
== SEQ_START_TOKEN
? proto_head() : proto_next(v
);
1443 static void proto_seq_stop(struct seq_file
*seq
, void *v
)
1445 read_unlock(&proto_list_lock
);
1448 static char proto_method_implemented(const void *method
)
1450 return method
== NULL
? 'n' : 'y';
1453 static void proto_seq_printf(struct seq_file
*seq
, struct proto
*proto
)
1455 seq_printf(seq
, "%-9s %4u %6d %6d %-3s %6u %-3s %-10s "
1456 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
1459 proto
->sockets_allocated
!= NULL
? atomic_read(proto
->sockets_allocated
) : -1,
1460 proto
->memory_allocated
!= NULL
? atomic_read(proto
->memory_allocated
) : -1,
1461 proto
->memory_pressure
!= NULL
? *proto
->memory_pressure
? "yes" : "no" : "NI",
1463 proto
->slab
== NULL
? "no" : "yes",
1464 module_name(proto
->owner
),
1465 proto_method_implemented(proto
->close
),
1466 proto_method_implemented(proto
->connect
),
1467 proto_method_implemented(proto
->disconnect
),
1468 proto_method_implemented(proto
->accept
),
1469 proto_method_implemented(proto
->ioctl
),
1470 proto_method_implemented(proto
->init
),
1471 proto_method_implemented(proto
->destroy
),
1472 proto_method_implemented(proto
->shutdown
),
1473 proto_method_implemented(proto
->setsockopt
),
1474 proto_method_implemented(proto
->getsockopt
),
1475 proto_method_implemented(proto
->sendmsg
),
1476 proto_method_implemented(proto
->recvmsg
),
1477 proto_method_implemented(proto
->sendpage
),
1478 proto_method_implemented(proto
->bind
),
1479 proto_method_implemented(proto
->backlog_rcv
),
1480 proto_method_implemented(proto
->hash
),
1481 proto_method_implemented(proto
->unhash
),
1482 proto_method_implemented(proto
->get_port
),
1483 proto_method_implemented(proto
->enter_memory_pressure
));
1486 static int proto_seq_show(struct seq_file
*seq
, void *v
)
1488 if (v
== SEQ_START_TOKEN
)
1489 seq_printf(seq
, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
1498 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
1500 proto_seq_printf(seq
, v
);
1504 static struct seq_operations proto_seq_ops
= {
1505 .start
= proto_seq_start
,
1506 .next
= proto_seq_next
,
1507 .stop
= proto_seq_stop
,
1508 .show
= proto_seq_show
,
1511 static int proto_seq_open(struct inode
*inode
, struct file
*file
)
1513 return seq_open(file
, &proto_seq_ops
);
1516 static struct file_operations proto_seq_fops
= {
1517 .owner
= THIS_MODULE
,
1518 .open
= proto_seq_open
,
1520 .llseek
= seq_lseek
,
1521 .release
= seq_release
,
1524 static int __init
proto_init(void)
1526 /* register /proc/net/protocols */
1527 return proc_net_fops_create("protocols", S_IRUGO
, &proto_seq_fops
) == NULL
? -ENOBUFS
: 0;
1530 subsys_initcall(proto_init
);
1532 #endif /* PROC_FS */
1534 EXPORT_SYMBOL(sk_alloc
);
1535 EXPORT_SYMBOL(sk_free
);
1536 EXPORT_SYMBOL(sk_send_sigurg
);
1537 EXPORT_SYMBOL(sock_alloc_send_skb
);
1538 EXPORT_SYMBOL(sock_init_data
);
1539 EXPORT_SYMBOL(sock_kfree_s
);
1540 EXPORT_SYMBOL(sock_kmalloc
);
1541 EXPORT_SYMBOL(sock_no_accept
);
1542 EXPORT_SYMBOL(sock_no_bind
);
1543 EXPORT_SYMBOL(sock_no_connect
);
1544 EXPORT_SYMBOL(sock_no_getname
);
1545 EXPORT_SYMBOL(sock_no_getsockopt
);
1546 EXPORT_SYMBOL(sock_no_ioctl
);
1547 EXPORT_SYMBOL(sock_no_listen
);
1548 EXPORT_SYMBOL(sock_no_mmap
);
1549 EXPORT_SYMBOL(sock_no_poll
);
1550 EXPORT_SYMBOL(sock_no_recvmsg
);
1551 EXPORT_SYMBOL(sock_no_sendmsg
);
1552 EXPORT_SYMBOL(sock_no_sendpage
);
1553 EXPORT_SYMBOL(sock_no_setsockopt
);
1554 EXPORT_SYMBOL(sock_no_shutdown
);
1555 EXPORT_SYMBOL(sock_no_socketpair
);
1556 EXPORT_SYMBOL(sock_rfree
);
1557 EXPORT_SYMBOL(sock_setsockopt
);
1558 EXPORT_SYMBOL(sock_wfree
);
1559 EXPORT_SYMBOL(sock_wmalloc
);
1560 EXPORT_SYMBOL(sock_i_uid
);
1561 EXPORT_SYMBOL(sock_i_ino
);
1562 #ifdef CONFIG_SYSCTL
1563 EXPORT_SYMBOL(sysctl_optmem_max
);
1564 EXPORT_SYMBOL(sysctl_rmem_max
);
1565 EXPORT_SYMBOL(sysctl_wmem_max
);