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();
190 int sock_queue_rcv_skb(struct sock
*sk
, struct sk_buff
*skb
)
195 /* Cast skb->rcvbuf to unsigned... It's pointless, but reduces
196 number of warnings when compiling with -W --ANK
198 if (atomic_read(&sk
->sk_rmem_alloc
) + skb
->truesize
>=
199 (unsigned)sk
->sk_rcvbuf
) {
204 /* It would be deadlock, if sock_queue_rcv_skb is used
205 with socket lock! We assume that users of this
206 function are lock free.
208 err
= sk_filter(sk
, skb
, 1);
213 skb_set_owner_r(skb
, sk
);
215 /* Cache the SKB length before we tack it onto the receive
216 * queue. Once it is added it no longer belongs to us and
217 * may be freed by other threads of control pulling packets
222 skb_queue_tail(&sk
->sk_receive_queue
, skb
);
224 if (!sock_flag(sk
, SOCK_DEAD
))
225 sk
->sk_data_ready(sk
, skb_len
);
229 EXPORT_SYMBOL(sock_queue_rcv_skb
);
231 int sk_receive_skb(struct sock
*sk
, struct sk_buff
*skb
)
233 int rc
= NET_RX_SUCCESS
;
235 if (sk_filter(sk
, skb
, 0))
236 goto discard_and_relse
;
241 if (!sock_owned_by_user(sk
))
242 rc
= sk
->sk_backlog_rcv(sk
, skb
);
244 sk_add_backlog(sk
, skb
);
253 EXPORT_SYMBOL(sk_receive_skb
);
255 struct dst_entry
*__sk_dst_check(struct sock
*sk
, u32 cookie
)
257 struct dst_entry
*dst
= sk
->sk_dst_cache
;
259 if (dst
&& dst
->obsolete
&& dst
->ops
->check(dst
, cookie
) == NULL
) {
260 sk
->sk_dst_cache
= NULL
;
267 EXPORT_SYMBOL(__sk_dst_check
);
269 struct dst_entry
*sk_dst_check(struct sock
*sk
, u32 cookie
)
271 struct dst_entry
*dst
= sk_dst_get(sk
);
273 if (dst
&& dst
->obsolete
&& dst
->ops
->check(dst
, cookie
) == NULL
) {
281 EXPORT_SYMBOL(sk_dst_check
);
284 * This is meant for all protocols to use and covers goings on
285 * at the socket level. Everything here is generic.
288 int sock_setsockopt(struct socket
*sock
, int level
, int optname
,
289 char __user
*optval
, int optlen
)
291 struct sock
*sk
=sock
->sk
;
292 struct sk_filter
*filter
;
299 * Options without arguments
302 #ifdef SO_DONTLINGER /* Compatibility item... */
303 if (optname
== SO_DONTLINGER
) {
305 sock_reset_flag(sk
, SOCK_LINGER
);
311 if(optlen
<sizeof(int))
314 if (get_user(val
, (int __user
*)optval
))
324 if(val
&& !capable(CAP_NET_ADMIN
))
329 sock_set_flag(sk
, SOCK_DBG
);
331 sock_reset_flag(sk
, SOCK_DBG
);
334 sk
->sk_reuse
= valbool
;
342 sock_set_flag(sk
, SOCK_LOCALROUTE
);
344 sock_reset_flag(sk
, SOCK_LOCALROUTE
);
347 sock_valbool_flag(sk
, SOCK_BROADCAST
, valbool
);
350 /* Don't error on this BSD doesn't and if you think
351 about it this is right. Otherwise apps have to
352 play 'guess the biggest size' games. RCVBUF/SNDBUF
353 are treated in BSD as hints */
355 if (val
> sysctl_wmem_max
)
356 val
= sysctl_wmem_max
;
358 sk
->sk_userlocks
|= SOCK_SNDBUF_LOCK
;
359 if ((val
* 2) < SOCK_MIN_SNDBUF
)
360 sk
->sk_sndbuf
= SOCK_MIN_SNDBUF
;
362 sk
->sk_sndbuf
= val
* 2;
365 * Wake up sending tasks if we
368 sk
->sk_write_space(sk
);
372 if (!capable(CAP_NET_ADMIN
)) {
379 /* Don't error on this BSD doesn't and if you think
380 about it this is right. Otherwise apps have to
381 play 'guess the biggest size' games. RCVBUF/SNDBUF
382 are treated in BSD as hints */
384 if (val
> sysctl_rmem_max
)
385 val
= sysctl_rmem_max
;
387 sk
->sk_userlocks
|= SOCK_RCVBUF_LOCK
;
389 * We double it on the way in to account for
390 * "struct sk_buff" etc. overhead. Applications
391 * assume that the SO_RCVBUF setting they make will
392 * allow that much actual data to be received on that
395 * Applications are unaware that "struct sk_buff" and
396 * other overheads allocate from the receive buffer
397 * during socket buffer allocation.
399 * And after considering the possible alternatives,
400 * returning the value we actually used in getsockopt
401 * is the most desirable behavior.
403 if ((val
* 2) < SOCK_MIN_RCVBUF
)
404 sk
->sk_rcvbuf
= SOCK_MIN_RCVBUF
;
406 sk
->sk_rcvbuf
= val
* 2;
410 if (!capable(CAP_NET_ADMIN
)) {
418 if (sk
->sk_protocol
== IPPROTO_TCP
)
419 tcp_set_keepalive(sk
, valbool
);
421 sock_valbool_flag(sk
, SOCK_KEEPOPEN
, valbool
);
425 sock_valbool_flag(sk
, SOCK_URGINLINE
, valbool
);
429 sk
->sk_no_check
= valbool
;
433 if ((val
>= 0 && val
<= 6) || capable(CAP_NET_ADMIN
))
434 sk
->sk_priority
= val
;
440 if(optlen
<sizeof(ling
)) {
441 ret
= -EINVAL
; /* 1003.1g */
444 if (copy_from_user(&ling
,optval
,sizeof(ling
))) {
449 sock_reset_flag(sk
, SOCK_LINGER
);
451 #if (BITS_PER_LONG == 32)
452 if ((unsigned int)ling
.l_linger
>= MAX_SCHEDULE_TIMEOUT
/HZ
)
453 sk
->sk_lingertime
= MAX_SCHEDULE_TIMEOUT
;
456 sk
->sk_lingertime
= (unsigned int)ling
.l_linger
* HZ
;
457 sock_set_flag(sk
, SOCK_LINGER
);
462 sock_warn_obsolete_bsdism("setsockopt");
467 set_bit(SOCK_PASSCRED
, &sock
->flags
);
469 clear_bit(SOCK_PASSCRED
, &sock
->flags
);
474 sock_set_flag(sk
, SOCK_RCVTSTAMP
);
475 sock_enable_timestamp(sk
);
477 sock_reset_flag(sk
, SOCK_RCVTSTAMP
);
483 sk
->sk_rcvlowat
= val
? : 1;
487 ret
= sock_set_timeout(&sk
->sk_rcvtimeo
, optval
, optlen
);
491 ret
= sock_set_timeout(&sk
->sk_sndtimeo
, optval
, optlen
);
494 #ifdef CONFIG_NETDEVICES
495 case SO_BINDTODEVICE
:
497 char devname
[IFNAMSIZ
];
500 if (!capable(CAP_NET_RAW
)) {
505 /* Bind this socket to a particular device like "eth0",
506 * as specified in the passed interface name. If the
507 * name is "" or the option length is zero the socket
512 sk
->sk_bound_dev_if
= 0;
514 if (optlen
> IFNAMSIZ
- 1)
515 optlen
= IFNAMSIZ
- 1;
516 memset(devname
, 0, sizeof(devname
));
517 if (copy_from_user(devname
, optval
, optlen
)) {
522 /* Remove any cached route for this socket. */
525 if (devname
[0] == '\0') {
526 sk
->sk_bound_dev_if
= 0;
528 struct net_device
*dev
= dev_get_by_name(devname
);
533 sk
->sk_bound_dev_if
= dev
->ifindex
;
542 case SO_ATTACH_FILTER
:
544 if (optlen
== sizeof(struct sock_fprog
)) {
545 struct sock_fprog fprog
;
548 if (copy_from_user(&fprog
, optval
, sizeof(fprog
)))
551 ret
= sk_attach_filter(&fprog
, sk
);
555 case SO_DETACH_FILTER
:
556 spin_lock_bh(&sk
->sk_lock
.slock
);
557 filter
= sk
->sk_filter
;
559 sk
->sk_filter
= NULL
;
560 spin_unlock_bh(&sk
->sk_lock
.slock
);
561 sk_filter_release(sk
, filter
);
564 spin_unlock_bh(&sk
->sk_lock
.slock
);
568 /* We implement the SO_SNDLOWAT etc to
569 not be settable (1003.1g 5.3) */
579 int sock_getsockopt(struct socket
*sock
, int level
, int optname
,
580 char __user
*optval
, int __user
*optlen
)
582 struct sock
*sk
= sock
->sk
;
591 unsigned int lv
= sizeof(int);
594 if(get_user(len
,optlen
))
602 v
.val
= sock_flag(sk
, SOCK_DBG
);
606 v
.val
= sock_flag(sk
, SOCK_LOCALROUTE
);
610 v
.val
= !!sock_flag(sk
, SOCK_BROADCAST
);
614 v
.val
= sk
->sk_sndbuf
;
618 v
.val
= sk
->sk_rcvbuf
;
622 v
.val
= sk
->sk_reuse
;
626 v
.val
= !!sock_flag(sk
, SOCK_KEEPOPEN
);
634 v
.val
= -sock_error(sk
);
636 v
.val
= xchg(&sk
->sk_err_soft
, 0);
640 v
.val
= !!sock_flag(sk
, SOCK_URGINLINE
);
644 v
.val
= sk
->sk_no_check
;
648 v
.val
= sk
->sk_priority
;
653 v
.ling
.l_onoff
= !!sock_flag(sk
, SOCK_LINGER
);
654 v
.ling
.l_linger
= sk
->sk_lingertime
/ HZ
;
658 sock_warn_obsolete_bsdism("getsockopt");
662 v
.val
= sock_flag(sk
, SOCK_RCVTSTAMP
);
666 lv
=sizeof(struct timeval
);
667 if (sk
->sk_rcvtimeo
== MAX_SCHEDULE_TIMEOUT
) {
671 v
.tm
.tv_sec
= sk
->sk_rcvtimeo
/ HZ
;
672 v
.tm
.tv_usec
= ((sk
->sk_rcvtimeo
% HZ
) * 1000000) / HZ
;
677 lv
=sizeof(struct timeval
);
678 if (sk
->sk_sndtimeo
== MAX_SCHEDULE_TIMEOUT
) {
682 v
.tm
.tv_sec
= sk
->sk_sndtimeo
/ HZ
;
683 v
.tm
.tv_usec
= ((sk
->sk_sndtimeo
% HZ
) * 1000000) / HZ
;
688 v
.val
= sk
->sk_rcvlowat
;
696 v
.val
= test_bit(SOCK_PASSCRED
, &sock
->flags
) ? 1 : 0;
700 if (len
> sizeof(sk
->sk_peercred
))
701 len
= sizeof(sk
->sk_peercred
);
702 if (copy_to_user(optval
, &sk
->sk_peercred
, len
))
710 if (sock
->ops
->getname(sock
, (struct sockaddr
*)address
, &lv
, 2))
714 if (copy_to_user(optval
, address
, len
))
719 /* Dubious BSD thing... Probably nobody even uses it, but
720 * the UNIX standard wants it for whatever reason... -DaveM
723 v
.val
= sk
->sk_state
== TCP_LISTEN
;
727 return security_socket_getpeersec_stream(sock
, optval
, optlen
, len
);
730 return(-ENOPROTOOPT
);
734 if (copy_to_user(optval
, &v
, len
))
737 if (put_user(len
, optlen
))
743 * sk_alloc - All socket objects are allocated here
744 * @family: protocol family
745 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
746 * @prot: struct proto associated with this new sock instance
747 * @zero_it: if we should zero the newly allocated sock
749 struct sock
*sk_alloc(int family
, gfp_t priority
,
750 struct proto
*prot
, int zero_it
)
752 struct sock
*sk
= NULL
;
753 kmem_cache_t
*slab
= prot
->slab
;
756 sk
= kmem_cache_alloc(slab
, priority
);
758 sk
= kmalloc(prot
->obj_size
, priority
);
762 memset(sk
, 0, prot
->obj_size
);
763 sk
->sk_family
= family
;
765 * See comment in struct sock definition to understand
766 * why we need sk_prot_creator -acme
768 sk
->sk_prot
= sk
->sk_prot_creator
= prot
;
772 if (security_sk_alloc(sk
, family
, priority
))
775 if (!try_module_get(prot
->owner
))
782 kmem_cache_free(slab
, sk
);
788 void sk_free(struct sock
*sk
)
790 struct sk_filter
*filter
;
791 struct module
*owner
= sk
->sk_prot_creator
->owner
;
796 filter
= sk
->sk_filter
;
798 sk_filter_release(sk
, filter
);
799 sk
->sk_filter
= NULL
;
802 sock_disable_timestamp(sk
);
804 if (atomic_read(&sk
->sk_omem_alloc
))
805 printk(KERN_DEBUG
"%s: optmem leakage (%d bytes) detected.\n",
806 __FUNCTION__
, atomic_read(&sk
->sk_omem_alloc
));
808 security_sk_free(sk
);
809 if (sk
->sk_prot_creator
->slab
!= NULL
)
810 kmem_cache_free(sk
->sk_prot_creator
->slab
, sk
);
816 struct sock
*sk_clone(const struct sock
*sk
, const gfp_t priority
)
818 struct sock
*newsk
= sk_alloc(sk
->sk_family
, priority
, sk
->sk_prot
, 0);
821 struct sk_filter
*filter
;
823 memcpy(newsk
, sk
, sk
->sk_prot
->obj_size
);
826 sk_node_init(&newsk
->sk_node
);
827 sock_lock_init(newsk
);
830 atomic_set(&newsk
->sk_rmem_alloc
, 0);
831 atomic_set(&newsk
->sk_wmem_alloc
, 0);
832 atomic_set(&newsk
->sk_omem_alloc
, 0);
833 skb_queue_head_init(&newsk
->sk_receive_queue
);
834 skb_queue_head_init(&newsk
->sk_write_queue
);
835 #ifdef CONFIG_NET_DMA
836 skb_queue_head_init(&newsk
->sk_async_wait_queue
);
839 rwlock_init(&newsk
->sk_dst_lock
);
840 rwlock_init(&newsk
->sk_callback_lock
);
842 newsk
->sk_dst_cache
= NULL
;
843 newsk
->sk_wmem_queued
= 0;
844 newsk
->sk_forward_alloc
= 0;
845 newsk
->sk_send_head
= NULL
;
846 newsk
->sk_backlog
.head
= newsk
->sk_backlog
.tail
= NULL
;
847 newsk
->sk_userlocks
= sk
->sk_userlocks
& ~SOCK_BINDPORT_LOCK
;
849 sock_reset_flag(newsk
, SOCK_DONE
);
850 skb_queue_head_init(&newsk
->sk_error_queue
);
852 filter
= newsk
->sk_filter
;
854 sk_filter_charge(newsk
, filter
);
856 if (unlikely(xfrm_sk_clone_policy(newsk
))) {
857 /* It is still raw copy of parent, so invalidate
858 * destructor and make plain sk_free() */
859 newsk
->sk_destruct
= NULL
;
866 newsk
->sk_priority
= 0;
867 atomic_set(&newsk
->sk_refcnt
, 2);
870 * Increment the counter in the same struct proto as the master
871 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
872 * is the same as sk->sk_prot->socks, as this field was copied
875 * This _changes_ the previous behaviour, where
876 * tcp_create_openreq_child always was incrementing the
877 * equivalent to tcp_prot->socks (inet_sock_nr), so this have
878 * to be taken into account in all callers. -acme
880 sk_refcnt_debug_inc(newsk
);
881 newsk
->sk_socket
= NULL
;
882 newsk
->sk_sleep
= NULL
;
884 if (newsk
->sk_prot
->sockets_allocated
)
885 atomic_inc(newsk
->sk_prot
->sockets_allocated
);
891 EXPORT_SYMBOL_GPL(sk_clone
);
893 void __init
sk_init(void)
895 if (num_physpages
<= 4096) {
896 sysctl_wmem_max
= 32767;
897 sysctl_rmem_max
= 32767;
898 sysctl_wmem_default
= 32767;
899 sysctl_rmem_default
= 32767;
900 } else if (num_physpages
>= 131072) {
901 sysctl_wmem_max
= 131071;
902 sysctl_rmem_max
= 131071;
907 * Simple resource managers for sockets.
912 * Write buffer destructor automatically called from kfree_skb.
914 void sock_wfree(struct sk_buff
*skb
)
916 struct sock
*sk
= skb
->sk
;
918 /* In case it might be waiting for more memory. */
919 atomic_sub(skb
->truesize
, &sk
->sk_wmem_alloc
);
920 if (!sock_flag(sk
, SOCK_USE_WRITE_QUEUE
))
921 sk
->sk_write_space(sk
);
926 * Read buffer destructor automatically called from kfree_skb.
928 void sock_rfree(struct sk_buff
*skb
)
930 struct sock
*sk
= skb
->sk
;
932 atomic_sub(skb
->truesize
, &sk
->sk_rmem_alloc
);
936 int sock_i_uid(struct sock
*sk
)
940 read_lock(&sk
->sk_callback_lock
);
941 uid
= sk
->sk_socket
? SOCK_INODE(sk
->sk_socket
)->i_uid
: 0;
942 read_unlock(&sk
->sk_callback_lock
);
946 unsigned long sock_i_ino(struct sock
*sk
)
950 read_lock(&sk
->sk_callback_lock
);
951 ino
= sk
->sk_socket
? SOCK_INODE(sk
->sk_socket
)->i_ino
: 0;
952 read_unlock(&sk
->sk_callback_lock
);
957 * Allocate a skb from the socket's send buffer.
959 struct sk_buff
*sock_wmalloc(struct sock
*sk
, unsigned long size
, int force
,
962 if (force
|| atomic_read(&sk
->sk_wmem_alloc
) < sk
->sk_sndbuf
) {
963 struct sk_buff
* skb
= alloc_skb(size
, priority
);
965 skb_set_owner_w(skb
, sk
);
973 * Allocate a skb from the socket's receive buffer.
975 struct sk_buff
*sock_rmalloc(struct sock
*sk
, unsigned long size
, int force
,
978 if (force
|| atomic_read(&sk
->sk_rmem_alloc
) < sk
->sk_rcvbuf
) {
979 struct sk_buff
*skb
= alloc_skb(size
, priority
);
981 skb_set_owner_r(skb
, sk
);
989 * Allocate a memory block from the socket's option memory buffer.
991 void *sock_kmalloc(struct sock
*sk
, int size
, gfp_t priority
)
993 if ((unsigned)size
<= sysctl_optmem_max
&&
994 atomic_read(&sk
->sk_omem_alloc
) + size
< sysctl_optmem_max
) {
996 /* First do the add, to avoid the race if kmalloc
999 atomic_add(size
, &sk
->sk_omem_alloc
);
1000 mem
= kmalloc(size
, priority
);
1003 atomic_sub(size
, &sk
->sk_omem_alloc
);
1009 * Free an option memory block.
1011 void sock_kfree_s(struct sock
*sk
, void *mem
, int size
)
1014 atomic_sub(size
, &sk
->sk_omem_alloc
);
1017 /* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
1018 I think, these locks should be removed for datagram sockets.
1020 static long sock_wait_for_wmem(struct sock
* sk
, long timeo
)
1024 clear_bit(SOCK_ASYNC_NOSPACE
, &sk
->sk_socket
->flags
);
1028 if (signal_pending(current
))
1030 set_bit(SOCK_NOSPACE
, &sk
->sk_socket
->flags
);
1031 prepare_to_wait(sk
->sk_sleep
, &wait
, TASK_INTERRUPTIBLE
);
1032 if (atomic_read(&sk
->sk_wmem_alloc
) < sk
->sk_sndbuf
)
1034 if (sk
->sk_shutdown
& SEND_SHUTDOWN
)
1038 timeo
= schedule_timeout(timeo
);
1040 finish_wait(sk
->sk_sleep
, &wait
);
1046 * Generic send/receive buffer handlers
1049 static struct sk_buff
*sock_alloc_send_pskb(struct sock
*sk
,
1050 unsigned long header_len
,
1051 unsigned long data_len
,
1052 int noblock
, int *errcode
)
1054 struct sk_buff
*skb
;
1059 gfp_mask
= sk
->sk_allocation
;
1060 if (gfp_mask
& __GFP_WAIT
)
1061 gfp_mask
|= __GFP_REPEAT
;
1063 timeo
= sock_sndtimeo(sk
, noblock
);
1065 err
= sock_error(sk
);
1070 if (sk
->sk_shutdown
& SEND_SHUTDOWN
)
1073 if (atomic_read(&sk
->sk_wmem_alloc
) < sk
->sk_sndbuf
) {
1074 skb
= alloc_skb(header_len
, sk
->sk_allocation
);
1079 /* No pages, we're done... */
1083 npages
= (data_len
+ (PAGE_SIZE
- 1)) >> PAGE_SHIFT
;
1084 skb
->truesize
+= data_len
;
1085 skb_shinfo(skb
)->nr_frags
= npages
;
1086 for (i
= 0; i
< npages
; i
++) {
1090 page
= alloc_pages(sk
->sk_allocation
, 0);
1093 skb_shinfo(skb
)->nr_frags
= i
;
1098 frag
= &skb_shinfo(skb
)->frags
[i
];
1100 frag
->page_offset
= 0;
1101 frag
->size
= (data_len
>= PAGE_SIZE
?
1104 data_len
-= PAGE_SIZE
;
1107 /* Full success... */
1113 set_bit(SOCK_ASYNC_NOSPACE
, &sk
->sk_socket
->flags
);
1114 set_bit(SOCK_NOSPACE
, &sk
->sk_socket
->flags
);
1118 if (signal_pending(current
))
1120 timeo
= sock_wait_for_wmem(sk
, timeo
);
1123 skb_set_owner_w(skb
, sk
);
1127 err
= sock_intr_errno(timeo
);
1133 struct sk_buff
*sock_alloc_send_skb(struct sock
*sk
, unsigned long size
,
1134 int noblock
, int *errcode
)
1136 return sock_alloc_send_pskb(sk
, size
, 0, noblock
, errcode
);
1139 static void __lock_sock(struct sock
*sk
)
1144 prepare_to_wait_exclusive(&sk
->sk_lock
.wq
, &wait
,
1145 TASK_UNINTERRUPTIBLE
);
1146 spin_unlock_bh(&sk
->sk_lock
.slock
);
1148 spin_lock_bh(&sk
->sk_lock
.slock
);
1149 if(!sock_owned_by_user(sk
))
1152 finish_wait(&sk
->sk_lock
.wq
, &wait
);
1155 static void __release_sock(struct sock
*sk
)
1157 struct sk_buff
*skb
= sk
->sk_backlog
.head
;
1160 sk
->sk_backlog
.head
= sk
->sk_backlog
.tail
= NULL
;
1164 struct sk_buff
*next
= skb
->next
;
1167 sk
->sk_backlog_rcv(sk
, skb
);
1170 * We are in process context here with softirqs
1171 * disabled, use cond_resched_softirq() to preempt.
1172 * This is safe to do because we've taken the backlog
1175 cond_resched_softirq();
1178 } while (skb
!= NULL
);
1181 } while((skb
= sk
->sk_backlog
.head
) != NULL
);
1185 * sk_wait_data - wait for data to arrive at sk_receive_queue
1186 * @sk: sock to wait on
1187 * @timeo: for how long
1189 * Now socket state including sk->sk_err is changed only under lock,
1190 * hence we may omit checks after joining wait queue.
1191 * We check receive queue before schedule() only as optimization;
1192 * it is very likely that release_sock() added new data.
1194 int sk_wait_data(struct sock
*sk
, long *timeo
)
1199 prepare_to_wait(sk
->sk_sleep
, &wait
, TASK_INTERRUPTIBLE
);
1200 set_bit(SOCK_ASYNC_WAITDATA
, &sk
->sk_socket
->flags
);
1201 rc
= sk_wait_event(sk
, timeo
, !skb_queue_empty(&sk
->sk_receive_queue
));
1202 clear_bit(SOCK_ASYNC_WAITDATA
, &sk
->sk_socket
->flags
);
1203 finish_wait(sk
->sk_sleep
, &wait
);
1207 EXPORT_SYMBOL(sk_wait_data
);
1210 * Set of default routines for initialising struct proto_ops when
1211 * the protocol does not support a particular function. In certain
1212 * cases where it makes no sense for a protocol to have a "do nothing"
1213 * function, some default processing is provided.
1216 int sock_no_bind(struct socket
*sock
, struct sockaddr
*saddr
, int len
)
1221 int sock_no_connect(struct socket
*sock
, struct sockaddr
*saddr
,
1227 int sock_no_socketpair(struct socket
*sock1
, struct socket
*sock2
)
1232 int sock_no_accept(struct socket
*sock
, struct socket
*newsock
, int flags
)
1237 int sock_no_getname(struct socket
*sock
, struct sockaddr
*saddr
,
1243 unsigned int sock_no_poll(struct file
* file
, struct socket
*sock
, poll_table
*pt
)
1248 int sock_no_ioctl(struct socket
*sock
, unsigned int cmd
, unsigned long arg
)
1253 int sock_no_listen(struct socket
*sock
, int backlog
)
1258 int sock_no_shutdown(struct socket
*sock
, int how
)
1263 int sock_no_setsockopt(struct socket
*sock
, int level
, int optname
,
1264 char __user
*optval
, int optlen
)
1269 int sock_no_getsockopt(struct socket
*sock
, int level
, int optname
,
1270 char __user
*optval
, int __user
*optlen
)
1275 int sock_no_sendmsg(struct kiocb
*iocb
, struct socket
*sock
, struct msghdr
*m
,
1281 int sock_no_recvmsg(struct kiocb
*iocb
, struct socket
*sock
, struct msghdr
*m
,
1282 size_t len
, int flags
)
1287 int sock_no_mmap(struct file
*file
, struct socket
*sock
, struct vm_area_struct
*vma
)
1289 /* Mirror missing mmap method error code */
1293 ssize_t
sock_no_sendpage(struct socket
*sock
, struct page
*page
, int offset
, size_t size
, int flags
)
1296 struct msghdr msg
= {.msg_flags
= flags
};
1298 char *kaddr
= kmap(page
);
1299 iov
.iov_base
= kaddr
+ offset
;
1301 res
= kernel_sendmsg(sock
, &msg
, &iov
, 1, size
);
1307 * Default Socket Callbacks
1310 static void sock_def_wakeup(struct sock
*sk
)
1312 read_lock(&sk
->sk_callback_lock
);
1313 if (sk
->sk_sleep
&& waitqueue_active(sk
->sk_sleep
))
1314 wake_up_interruptible_all(sk
->sk_sleep
);
1315 read_unlock(&sk
->sk_callback_lock
);
1318 static void sock_def_error_report(struct sock
*sk
)
1320 read_lock(&sk
->sk_callback_lock
);
1321 if (sk
->sk_sleep
&& waitqueue_active(sk
->sk_sleep
))
1322 wake_up_interruptible(sk
->sk_sleep
);
1323 sk_wake_async(sk
,0,POLL_ERR
);
1324 read_unlock(&sk
->sk_callback_lock
);
1327 static void sock_def_readable(struct sock
*sk
, int len
)
1329 read_lock(&sk
->sk_callback_lock
);
1330 if (sk
->sk_sleep
&& waitqueue_active(sk
->sk_sleep
))
1331 wake_up_interruptible(sk
->sk_sleep
);
1332 sk_wake_async(sk
,1,POLL_IN
);
1333 read_unlock(&sk
->sk_callback_lock
);
1336 static void sock_def_write_space(struct sock
*sk
)
1338 read_lock(&sk
->sk_callback_lock
);
1340 /* Do not wake up a writer until he can make "significant"
1343 if((atomic_read(&sk
->sk_wmem_alloc
) << 1) <= sk
->sk_sndbuf
) {
1344 if (sk
->sk_sleep
&& waitqueue_active(sk
->sk_sleep
))
1345 wake_up_interruptible(sk
->sk_sleep
);
1347 /* Should agree with poll, otherwise some programs break */
1348 if (sock_writeable(sk
))
1349 sk_wake_async(sk
, 2, POLL_OUT
);
1352 read_unlock(&sk
->sk_callback_lock
);
1355 static void sock_def_destruct(struct sock
*sk
)
1357 kfree(sk
->sk_protinfo
);
1360 void sk_send_sigurg(struct sock
*sk
)
1362 if (sk
->sk_socket
&& sk
->sk_socket
->file
)
1363 if (send_sigurg(&sk
->sk_socket
->file
->f_owner
))
1364 sk_wake_async(sk
, 3, POLL_PRI
);
1367 void sk_reset_timer(struct sock
*sk
, struct timer_list
* timer
,
1368 unsigned long expires
)
1370 if (!mod_timer(timer
, expires
))
1374 EXPORT_SYMBOL(sk_reset_timer
);
1376 void sk_stop_timer(struct sock
*sk
, struct timer_list
* timer
)
1378 if (timer_pending(timer
) && del_timer(timer
))
1382 EXPORT_SYMBOL(sk_stop_timer
);
1384 void sock_init_data(struct socket
*sock
, struct sock
*sk
)
1386 skb_queue_head_init(&sk
->sk_receive_queue
);
1387 skb_queue_head_init(&sk
->sk_write_queue
);
1388 skb_queue_head_init(&sk
->sk_error_queue
);
1389 #ifdef CONFIG_NET_DMA
1390 skb_queue_head_init(&sk
->sk_async_wait_queue
);
1393 sk
->sk_send_head
= NULL
;
1395 init_timer(&sk
->sk_timer
);
1397 sk
->sk_allocation
= GFP_KERNEL
;
1398 sk
->sk_rcvbuf
= sysctl_rmem_default
;
1399 sk
->sk_sndbuf
= sysctl_wmem_default
;
1400 sk
->sk_state
= TCP_CLOSE
;
1401 sk
->sk_socket
= sock
;
1403 sock_set_flag(sk
, SOCK_ZAPPED
);
1407 sk
->sk_type
= sock
->type
;
1408 sk
->sk_sleep
= &sock
->wait
;
1411 sk
->sk_sleep
= NULL
;
1413 rwlock_init(&sk
->sk_dst_lock
);
1414 rwlock_init(&sk
->sk_callback_lock
);
1416 sk
->sk_state_change
= sock_def_wakeup
;
1417 sk
->sk_data_ready
= sock_def_readable
;
1418 sk
->sk_write_space
= sock_def_write_space
;
1419 sk
->sk_error_report
= sock_def_error_report
;
1420 sk
->sk_destruct
= sock_def_destruct
;
1422 sk
->sk_sndmsg_page
= NULL
;
1423 sk
->sk_sndmsg_off
= 0;
1425 sk
->sk_peercred
.pid
= 0;
1426 sk
->sk_peercred
.uid
= -1;
1427 sk
->sk_peercred
.gid
= -1;
1428 sk
->sk_write_pending
= 0;
1429 sk
->sk_rcvlowat
= 1;
1430 sk
->sk_rcvtimeo
= MAX_SCHEDULE_TIMEOUT
;
1431 sk
->sk_sndtimeo
= MAX_SCHEDULE_TIMEOUT
;
1433 sk
->sk_stamp
.tv_sec
= -1L;
1434 sk
->sk_stamp
.tv_usec
= -1L;
1436 atomic_set(&sk
->sk_refcnt
, 1);
1439 void fastcall
lock_sock(struct sock
*sk
)
1442 spin_lock_bh(&(sk
->sk_lock
.slock
));
1443 if (sk
->sk_lock
.owner
)
1445 sk
->sk_lock
.owner
= (void *)1;
1446 spin_unlock_bh(&(sk
->sk_lock
.slock
));
1449 EXPORT_SYMBOL(lock_sock
);
1451 void fastcall
release_sock(struct sock
*sk
)
1453 spin_lock_bh(&(sk
->sk_lock
.slock
));
1454 if (sk
->sk_backlog
.tail
)
1456 sk
->sk_lock
.owner
= NULL
;
1457 if (waitqueue_active(&(sk
->sk_lock
.wq
)))
1458 wake_up(&(sk
->sk_lock
.wq
));
1459 spin_unlock_bh(&(sk
->sk_lock
.slock
));
1461 EXPORT_SYMBOL(release_sock
);
1463 int sock_get_timestamp(struct sock
*sk
, struct timeval __user
*userstamp
)
1465 if (!sock_flag(sk
, SOCK_TIMESTAMP
))
1466 sock_enable_timestamp(sk
);
1467 if (sk
->sk_stamp
.tv_sec
== -1)
1469 if (sk
->sk_stamp
.tv_sec
== 0)
1470 do_gettimeofday(&sk
->sk_stamp
);
1471 return copy_to_user(userstamp
, &sk
->sk_stamp
, sizeof(struct timeval
)) ?
1474 EXPORT_SYMBOL(sock_get_timestamp
);
1476 void sock_enable_timestamp(struct sock
*sk
)
1478 if (!sock_flag(sk
, SOCK_TIMESTAMP
)) {
1479 sock_set_flag(sk
, SOCK_TIMESTAMP
);
1480 net_enable_timestamp();
1483 EXPORT_SYMBOL(sock_enable_timestamp
);
1486 * Get a socket option on an socket.
1488 * FIX: POSIX 1003.1g is very ambiguous here. It states that
1489 * asynchronous errors should be reported by getsockopt. We assume
1490 * this means if you specify SO_ERROR (otherwise whats the point of it).
1492 int sock_common_getsockopt(struct socket
*sock
, int level
, int optname
,
1493 char __user
*optval
, int __user
*optlen
)
1495 struct sock
*sk
= sock
->sk
;
1497 return sk
->sk_prot
->getsockopt(sk
, level
, optname
, optval
, optlen
);
1500 EXPORT_SYMBOL(sock_common_getsockopt
);
1502 #ifdef CONFIG_COMPAT
1503 int compat_sock_common_getsockopt(struct socket
*sock
, int level
, int optname
,
1504 char __user
*optval
, int __user
*optlen
)
1506 struct sock
*sk
= sock
->sk
;
1508 if (sk
->sk_prot
->compat_setsockopt
!= NULL
)
1509 return sk
->sk_prot
->compat_getsockopt(sk
, level
, optname
,
1511 return sk
->sk_prot
->getsockopt(sk
, level
, optname
, optval
, optlen
);
1513 EXPORT_SYMBOL(compat_sock_common_getsockopt
);
1516 int sock_common_recvmsg(struct kiocb
*iocb
, struct socket
*sock
,
1517 struct msghdr
*msg
, size_t size
, int flags
)
1519 struct sock
*sk
= sock
->sk
;
1523 err
= sk
->sk_prot
->recvmsg(iocb
, sk
, msg
, size
, flags
& MSG_DONTWAIT
,
1524 flags
& ~MSG_DONTWAIT
, &addr_len
);
1526 msg
->msg_namelen
= addr_len
;
1530 EXPORT_SYMBOL(sock_common_recvmsg
);
1533 * Set socket options on an inet socket.
1535 int sock_common_setsockopt(struct socket
*sock
, int level
, int optname
,
1536 char __user
*optval
, int optlen
)
1538 struct sock
*sk
= sock
->sk
;
1540 return sk
->sk_prot
->setsockopt(sk
, level
, optname
, optval
, optlen
);
1543 EXPORT_SYMBOL(sock_common_setsockopt
);
1545 #ifdef CONFIG_COMPAT
1546 int compat_sock_common_setsockopt(struct socket
*sock
, int level
, int optname
,
1547 char __user
*optval
, int optlen
)
1549 struct sock
*sk
= sock
->sk
;
1551 if (sk
->sk_prot
->compat_setsockopt
!= NULL
)
1552 return sk
->sk_prot
->compat_setsockopt(sk
, level
, optname
,
1554 return sk
->sk_prot
->setsockopt(sk
, level
, optname
, optval
, optlen
);
1556 EXPORT_SYMBOL(compat_sock_common_setsockopt
);
1559 void sk_common_release(struct sock
*sk
)
1561 if (sk
->sk_prot
->destroy
)
1562 sk
->sk_prot
->destroy(sk
);
1565 * Observation: when sock_common_release is called, processes have
1566 * no access to socket. But net still has.
1567 * Step one, detach it from networking:
1569 * A. Remove from hash tables.
1572 sk
->sk_prot
->unhash(sk
);
1575 * In this point socket cannot receive new packets, but it is possible
1576 * that some packets are in flight because some CPU runs receiver and
1577 * did hash table lookup before we unhashed socket. They will achieve
1578 * receive queue and will be purged by socket destructor.
1580 * Also we still have packets pending on receive queue and probably,
1581 * our own packets waiting in device queues. sock_destroy will drain
1582 * receive queue, but transmitted packets will delay socket destruction
1583 * until the last reference will be released.
1588 xfrm_sk_free_policy(sk
);
1590 sk_refcnt_debug_release(sk
);
1594 EXPORT_SYMBOL(sk_common_release
);
1596 static DEFINE_RWLOCK(proto_list_lock
);
1597 static LIST_HEAD(proto_list
);
1599 int proto_register(struct proto
*prot
, int alloc_slab
)
1601 char *request_sock_slab_name
= NULL
;
1602 char *timewait_sock_slab_name
;
1606 prot
->slab
= kmem_cache_create(prot
->name
, prot
->obj_size
, 0,
1607 SLAB_HWCACHE_ALIGN
, NULL
, NULL
);
1609 if (prot
->slab
== NULL
) {
1610 printk(KERN_CRIT
"%s: Can't create sock SLAB cache!\n",
1615 if (prot
->rsk_prot
!= NULL
) {
1616 static const char mask
[] = "request_sock_%s";
1618 request_sock_slab_name
= kmalloc(strlen(prot
->name
) + sizeof(mask
) - 1, GFP_KERNEL
);
1619 if (request_sock_slab_name
== NULL
)
1620 goto out_free_sock_slab
;
1622 sprintf(request_sock_slab_name
, mask
, prot
->name
);
1623 prot
->rsk_prot
->slab
= kmem_cache_create(request_sock_slab_name
,
1624 prot
->rsk_prot
->obj_size
, 0,
1625 SLAB_HWCACHE_ALIGN
, NULL
, NULL
);
1627 if (prot
->rsk_prot
->slab
== NULL
) {
1628 printk(KERN_CRIT
"%s: Can't create request sock SLAB cache!\n",
1630 goto out_free_request_sock_slab_name
;
1634 if (prot
->twsk_prot
!= NULL
) {
1635 static const char mask
[] = "tw_sock_%s";
1637 timewait_sock_slab_name
= kmalloc(strlen(prot
->name
) + sizeof(mask
) - 1, GFP_KERNEL
);
1639 if (timewait_sock_slab_name
== NULL
)
1640 goto out_free_request_sock_slab
;
1642 sprintf(timewait_sock_slab_name
, mask
, prot
->name
);
1643 prot
->twsk_prot
->twsk_slab
=
1644 kmem_cache_create(timewait_sock_slab_name
,
1645 prot
->twsk_prot
->twsk_obj_size
,
1646 0, SLAB_HWCACHE_ALIGN
,
1648 if (prot
->twsk_prot
->twsk_slab
== NULL
)
1649 goto out_free_timewait_sock_slab_name
;
1653 write_lock(&proto_list_lock
);
1654 list_add(&prot
->node
, &proto_list
);
1655 write_unlock(&proto_list_lock
);
1659 out_free_timewait_sock_slab_name
:
1660 kfree(timewait_sock_slab_name
);
1661 out_free_request_sock_slab
:
1662 if (prot
->rsk_prot
&& prot
->rsk_prot
->slab
) {
1663 kmem_cache_destroy(prot
->rsk_prot
->slab
);
1664 prot
->rsk_prot
->slab
= NULL
;
1666 out_free_request_sock_slab_name
:
1667 kfree(request_sock_slab_name
);
1669 kmem_cache_destroy(prot
->slab
);
1674 EXPORT_SYMBOL(proto_register
);
1676 void proto_unregister(struct proto
*prot
)
1678 write_lock(&proto_list_lock
);
1679 list_del(&prot
->node
);
1680 write_unlock(&proto_list_lock
);
1682 if (prot
->slab
!= NULL
) {
1683 kmem_cache_destroy(prot
->slab
);
1687 if (prot
->rsk_prot
!= NULL
&& prot
->rsk_prot
->slab
!= NULL
) {
1688 const char *name
= kmem_cache_name(prot
->rsk_prot
->slab
);
1690 kmem_cache_destroy(prot
->rsk_prot
->slab
);
1692 prot
->rsk_prot
->slab
= NULL
;
1695 if (prot
->twsk_prot
!= NULL
&& prot
->twsk_prot
->twsk_slab
!= NULL
) {
1696 const char *name
= kmem_cache_name(prot
->twsk_prot
->twsk_slab
);
1698 kmem_cache_destroy(prot
->twsk_prot
->twsk_slab
);
1700 prot
->twsk_prot
->twsk_slab
= NULL
;
1704 EXPORT_SYMBOL(proto_unregister
);
1706 #ifdef CONFIG_PROC_FS
1707 static inline struct proto
*__proto_head(void)
1709 return list_entry(proto_list
.next
, struct proto
, node
);
1712 static inline struct proto
*proto_head(void)
1714 return list_empty(&proto_list
) ? NULL
: __proto_head();
1717 static inline struct proto
*proto_next(struct proto
*proto
)
1719 return proto
->node
.next
== &proto_list
? NULL
:
1720 list_entry(proto
->node
.next
, struct proto
, node
);
1723 static inline struct proto
*proto_get_idx(loff_t pos
)
1725 struct proto
*proto
;
1728 list_for_each_entry(proto
, &proto_list
, node
)
1737 static void *proto_seq_start(struct seq_file
*seq
, loff_t
*pos
)
1739 read_lock(&proto_list_lock
);
1740 return *pos
? proto_get_idx(*pos
- 1) : SEQ_START_TOKEN
;
1743 static void *proto_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
1746 return v
== SEQ_START_TOKEN
? proto_head() : proto_next(v
);
1749 static void proto_seq_stop(struct seq_file
*seq
, void *v
)
1751 read_unlock(&proto_list_lock
);
1754 static char proto_method_implemented(const void *method
)
1756 return method
== NULL
? 'n' : 'y';
1759 static void proto_seq_printf(struct seq_file
*seq
, struct proto
*proto
)
1761 seq_printf(seq
, "%-9s %4u %6d %6d %-3s %6u %-3s %-10s "
1762 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
1765 proto
->sockets_allocated
!= NULL
? atomic_read(proto
->sockets_allocated
) : -1,
1766 proto
->memory_allocated
!= NULL
? atomic_read(proto
->memory_allocated
) : -1,
1767 proto
->memory_pressure
!= NULL
? *proto
->memory_pressure
? "yes" : "no" : "NI",
1769 proto
->slab
== NULL
? "no" : "yes",
1770 module_name(proto
->owner
),
1771 proto_method_implemented(proto
->close
),
1772 proto_method_implemented(proto
->connect
),
1773 proto_method_implemented(proto
->disconnect
),
1774 proto_method_implemented(proto
->accept
),
1775 proto_method_implemented(proto
->ioctl
),
1776 proto_method_implemented(proto
->init
),
1777 proto_method_implemented(proto
->destroy
),
1778 proto_method_implemented(proto
->shutdown
),
1779 proto_method_implemented(proto
->setsockopt
),
1780 proto_method_implemented(proto
->getsockopt
),
1781 proto_method_implemented(proto
->sendmsg
),
1782 proto_method_implemented(proto
->recvmsg
),
1783 proto_method_implemented(proto
->sendpage
),
1784 proto_method_implemented(proto
->bind
),
1785 proto_method_implemented(proto
->backlog_rcv
),
1786 proto_method_implemented(proto
->hash
),
1787 proto_method_implemented(proto
->unhash
),
1788 proto_method_implemented(proto
->get_port
),
1789 proto_method_implemented(proto
->enter_memory_pressure
));
1792 static int proto_seq_show(struct seq_file
*seq
, void *v
)
1794 if (v
== SEQ_START_TOKEN
)
1795 seq_printf(seq
, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
1804 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
1806 proto_seq_printf(seq
, v
);
1810 static struct seq_operations proto_seq_ops
= {
1811 .start
= proto_seq_start
,
1812 .next
= proto_seq_next
,
1813 .stop
= proto_seq_stop
,
1814 .show
= proto_seq_show
,
1817 static int proto_seq_open(struct inode
*inode
, struct file
*file
)
1819 return seq_open(file
, &proto_seq_ops
);
1822 static struct file_operations proto_seq_fops
= {
1823 .owner
= THIS_MODULE
,
1824 .open
= proto_seq_open
,
1826 .llseek
= seq_lseek
,
1827 .release
= seq_release
,
1830 static int __init
proto_init(void)
1832 /* register /proc/net/protocols */
1833 return proc_net_fops_create("protocols", S_IRUGO
, &proto_seq_fops
) == NULL
? -ENOBUFS
: 0;
1836 subsys_initcall(proto_init
);
1838 #endif /* PROC_FS */
1840 EXPORT_SYMBOL(sk_alloc
);
1841 EXPORT_SYMBOL(sk_free
);
1842 EXPORT_SYMBOL(sk_send_sigurg
);
1843 EXPORT_SYMBOL(sock_alloc_send_skb
);
1844 EXPORT_SYMBOL(sock_init_data
);
1845 EXPORT_SYMBOL(sock_kfree_s
);
1846 EXPORT_SYMBOL(sock_kmalloc
);
1847 EXPORT_SYMBOL(sock_no_accept
);
1848 EXPORT_SYMBOL(sock_no_bind
);
1849 EXPORT_SYMBOL(sock_no_connect
);
1850 EXPORT_SYMBOL(sock_no_getname
);
1851 EXPORT_SYMBOL(sock_no_getsockopt
);
1852 EXPORT_SYMBOL(sock_no_ioctl
);
1853 EXPORT_SYMBOL(sock_no_listen
);
1854 EXPORT_SYMBOL(sock_no_mmap
);
1855 EXPORT_SYMBOL(sock_no_poll
);
1856 EXPORT_SYMBOL(sock_no_recvmsg
);
1857 EXPORT_SYMBOL(sock_no_sendmsg
);
1858 EXPORT_SYMBOL(sock_no_sendpage
);
1859 EXPORT_SYMBOL(sock_no_setsockopt
);
1860 EXPORT_SYMBOL(sock_no_shutdown
);
1861 EXPORT_SYMBOL(sock_no_socketpair
);
1862 EXPORT_SYMBOL(sock_rfree
);
1863 EXPORT_SYMBOL(sock_setsockopt
);
1864 EXPORT_SYMBOL(sock_wfree
);
1865 EXPORT_SYMBOL(sock_wmalloc
);
1866 EXPORT_SYMBOL(sock_i_uid
);
1867 EXPORT_SYMBOL(sock_i_ino
);
1868 EXPORT_SYMBOL(sysctl_optmem_max
);
1869 #ifdef CONFIG_SYSCTL
1870 EXPORT_SYMBOL(sysctl_rmem_max
);
1871 EXPORT_SYMBOL(sysctl_wmem_max
);