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/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>
114 #include <linux/highmem.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/net_namespace.h>
123 #include <net/request_sock.h>
124 #include <net/sock.h>
125 #include <net/xfrm.h>
126 #include <linux/ipsec.h>
128 #include <linux/filter.h>
135 * Each address family might have different locking rules, so we have
136 * one slock key per address family:
138 static struct lock_class_key af_family_keys
[AF_MAX
];
139 static struct lock_class_key af_family_slock_keys
[AF_MAX
];
141 #ifdef CONFIG_DEBUG_LOCK_ALLOC
143 * Make lock validator output more readable. (we pre-construct these
144 * strings build-time, so that runtime initialization of socket
147 static const char *af_family_key_strings
[AF_MAX
+1] = {
148 "sk_lock-AF_UNSPEC", "sk_lock-AF_UNIX" , "sk_lock-AF_INET" ,
149 "sk_lock-AF_AX25" , "sk_lock-AF_IPX" , "sk_lock-AF_APPLETALK",
150 "sk_lock-AF_NETROM", "sk_lock-AF_BRIDGE" , "sk_lock-AF_ATMPVC" ,
151 "sk_lock-AF_X25" , "sk_lock-AF_INET6" , "sk_lock-AF_ROSE" ,
152 "sk_lock-AF_DECnet", "sk_lock-AF_NETBEUI" , "sk_lock-AF_SECURITY" ,
153 "sk_lock-AF_KEY" , "sk_lock-AF_NETLINK" , "sk_lock-AF_PACKET" ,
154 "sk_lock-AF_ASH" , "sk_lock-AF_ECONET" , "sk_lock-AF_ATMSVC" ,
155 "sk_lock-21" , "sk_lock-AF_SNA" , "sk_lock-AF_IRDA" ,
156 "sk_lock-AF_PPPOX" , "sk_lock-AF_WANPIPE" , "sk_lock-AF_LLC" ,
157 "sk_lock-27" , "sk_lock-28" , "sk_lock-AF_CAN" ,
158 "sk_lock-AF_TIPC" , "sk_lock-AF_BLUETOOTH", "sk_lock-IUCV" ,
159 "sk_lock-AF_RXRPC" , "sk_lock-AF_MAX"
161 static const char *af_family_slock_key_strings
[AF_MAX
+1] = {
162 "slock-AF_UNSPEC", "slock-AF_UNIX" , "slock-AF_INET" ,
163 "slock-AF_AX25" , "slock-AF_IPX" , "slock-AF_APPLETALK",
164 "slock-AF_NETROM", "slock-AF_BRIDGE" , "slock-AF_ATMPVC" ,
165 "slock-AF_X25" , "slock-AF_INET6" , "slock-AF_ROSE" ,
166 "slock-AF_DECnet", "slock-AF_NETBEUI" , "slock-AF_SECURITY" ,
167 "slock-AF_KEY" , "slock-AF_NETLINK" , "slock-AF_PACKET" ,
168 "slock-AF_ASH" , "slock-AF_ECONET" , "slock-AF_ATMSVC" ,
169 "slock-21" , "slock-AF_SNA" , "slock-AF_IRDA" ,
170 "slock-AF_PPPOX" , "slock-AF_WANPIPE" , "slock-AF_LLC" ,
171 "slock-27" , "slock-28" , "slock-AF_CAN" ,
172 "slock-AF_TIPC" , "slock-AF_BLUETOOTH", "slock-AF_IUCV" ,
173 "slock-AF_RXRPC" , "slock-AF_MAX"
175 static const char *af_family_clock_key_strings
[AF_MAX
+1] = {
176 "clock-AF_UNSPEC", "clock-AF_UNIX" , "clock-AF_INET" ,
177 "clock-AF_AX25" , "clock-AF_IPX" , "clock-AF_APPLETALK",
178 "clock-AF_NETROM", "clock-AF_BRIDGE" , "clock-AF_ATMPVC" ,
179 "clock-AF_X25" , "clock-AF_INET6" , "clock-AF_ROSE" ,
180 "clock-AF_DECnet", "clock-AF_NETBEUI" , "clock-AF_SECURITY" ,
181 "clock-AF_KEY" , "clock-AF_NETLINK" , "clock-AF_PACKET" ,
182 "clock-AF_ASH" , "clock-AF_ECONET" , "clock-AF_ATMSVC" ,
183 "clock-21" , "clock-AF_SNA" , "clock-AF_IRDA" ,
184 "clock-AF_PPPOX" , "clock-AF_WANPIPE" , "clock-AF_LLC" ,
185 "clock-27" , "clock-28" , "clock-29" ,
186 "clock-AF_TIPC" , "clock-AF_BLUETOOTH", "clock-AF_IUCV" ,
187 "clock-AF_RXRPC" , "clock-AF_MAX"
192 * sk_callback_lock locking rules are per-address-family,
193 * so split the lock classes by using a per-AF key:
195 static struct lock_class_key af_callback_keys
[AF_MAX
];
197 /* Take into consideration the size of the struct sk_buff overhead in the
198 * determination of these values, since that is non-constant across
199 * platforms. This makes socket queueing behavior and performance
200 * not depend upon such differences.
202 #define _SK_MEM_PACKETS 256
203 #define _SK_MEM_OVERHEAD (sizeof(struct sk_buff) + 256)
204 #define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
205 #define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
207 /* Run time adjustable parameters. */
208 __u32 sysctl_wmem_max __read_mostly
= SK_WMEM_MAX
;
209 __u32 sysctl_rmem_max __read_mostly
= SK_RMEM_MAX
;
210 __u32 sysctl_wmem_default __read_mostly
= SK_WMEM_MAX
;
211 __u32 sysctl_rmem_default __read_mostly
= SK_RMEM_MAX
;
213 /* Maximal space eaten by iovec or ancilliary data plus some space */
214 int sysctl_optmem_max __read_mostly
= sizeof(unsigned long)*(2*UIO_MAXIOV
+512);
216 static int sock_set_timeout(long *timeo_p
, char __user
*optval
, int optlen
)
220 if (optlen
< sizeof(tv
))
222 if (copy_from_user(&tv
, optval
, sizeof(tv
)))
224 if (tv
.tv_usec
< 0 || tv
.tv_usec
>= USEC_PER_SEC
)
228 static int warned __read_mostly
;
231 if (warned
< 10 && net_ratelimit())
233 printk(KERN_INFO
"sock_set_timeout: `%s' (pid %d) "
234 "tries to set negative timeout\n",
235 current
->comm
, task_pid_nr(current
));
238 *timeo_p
= MAX_SCHEDULE_TIMEOUT
;
239 if (tv
.tv_sec
== 0 && tv
.tv_usec
== 0)
241 if (tv
.tv_sec
< (MAX_SCHEDULE_TIMEOUT
/HZ
- 1))
242 *timeo_p
= tv
.tv_sec
*HZ
+ (tv
.tv_usec
+(1000000/HZ
-1))/(1000000/HZ
);
246 static void sock_warn_obsolete_bsdism(const char *name
)
249 static char warncomm
[TASK_COMM_LEN
];
250 if (strcmp(warncomm
, current
->comm
) && warned
< 5) {
251 strcpy(warncomm
, current
->comm
);
252 printk(KERN_WARNING
"process `%s' is using obsolete "
253 "%s SO_BSDCOMPAT\n", warncomm
, name
);
258 static void sock_disable_timestamp(struct sock
*sk
)
260 if (sock_flag(sk
, SOCK_TIMESTAMP
)) {
261 sock_reset_flag(sk
, SOCK_TIMESTAMP
);
262 net_disable_timestamp();
267 int sock_queue_rcv_skb(struct sock
*sk
, struct sk_buff
*skb
)
272 /* Cast skb->rcvbuf to unsigned... It's pointless, but reduces
273 number of warnings when compiling with -W --ANK
275 if (atomic_read(&sk
->sk_rmem_alloc
) + skb
->truesize
>=
276 (unsigned)sk
->sk_rcvbuf
) {
281 err
= sk_filter(sk
, skb
);
285 if (!sk_rmem_schedule(sk
, skb
->truesize
)) {
291 skb_set_owner_r(skb
, sk
);
293 /* Cache the SKB length before we tack it onto the receive
294 * queue. Once it is added it no longer belongs to us and
295 * may be freed by other threads of control pulling packets
300 skb_queue_tail(&sk
->sk_receive_queue
, skb
);
302 if (!sock_flag(sk
, SOCK_DEAD
))
303 sk
->sk_data_ready(sk
, skb_len
);
307 EXPORT_SYMBOL(sock_queue_rcv_skb
);
309 int sk_receive_skb(struct sock
*sk
, struct sk_buff
*skb
, const int nested
)
311 int rc
= NET_RX_SUCCESS
;
313 if (sk_filter(sk
, skb
))
314 goto discard_and_relse
;
319 bh_lock_sock_nested(sk
);
322 if (!sock_owned_by_user(sk
)) {
324 * trylock + unlock semantics:
326 mutex_acquire(&sk
->sk_lock
.dep_map
, 0, 1, _RET_IP_
);
328 rc
= sk
->sk_backlog_rcv(sk
, skb
);
330 mutex_release(&sk
->sk_lock
.dep_map
, 1, _RET_IP_
);
332 sk_add_backlog(sk
, skb
);
341 EXPORT_SYMBOL(sk_receive_skb
);
343 struct dst_entry
*__sk_dst_check(struct sock
*sk
, u32 cookie
)
345 struct dst_entry
*dst
= sk
->sk_dst_cache
;
347 if (dst
&& dst
->obsolete
&& dst
->ops
->check(dst
, cookie
) == NULL
) {
348 sk
->sk_dst_cache
= NULL
;
355 EXPORT_SYMBOL(__sk_dst_check
);
357 struct dst_entry
*sk_dst_check(struct sock
*sk
, u32 cookie
)
359 struct dst_entry
*dst
= sk_dst_get(sk
);
361 if (dst
&& dst
->obsolete
&& dst
->ops
->check(dst
, cookie
) == NULL
) {
369 EXPORT_SYMBOL(sk_dst_check
);
371 static int sock_bindtodevice(struct sock
*sk
, char __user
*optval
, int optlen
)
373 int ret
= -ENOPROTOOPT
;
374 #ifdef CONFIG_NETDEVICES
375 struct net
*net
= sk
->sk_net
;
376 char devname
[IFNAMSIZ
];
381 if (!capable(CAP_NET_RAW
))
388 /* Bind this socket to a particular device like "eth0",
389 * as specified in the passed interface name. If the
390 * name is "" or the option length is zero the socket
393 if (optlen
> IFNAMSIZ
- 1)
394 optlen
= IFNAMSIZ
- 1;
395 memset(devname
, 0, sizeof(devname
));
398 if (copy_from_user(devname
, optval
, optlen
))
401 if (devname
[0] == '\0') {
404 struct net_device
*dev
= dev_get_by_name(net
, devname
);
410 index
= dev
->ifindex
;
415 sk
->sk_bound_dev_if
= index
;
427 static inline void sock_valbool_flag(struct sock
*sk
, int bit
, int valbool
)
430 sock_set_flag(sk
, bit
);
432 sock_reset_flag(sk
, bit
);
436 * This is meant for all protocols to use and covers goings on
437 * at the socket level. Everything here is generic.
440 int sock_setsockopt(struct socket
*sock
, int level
, int optname
,
441 char __user
*optval
, int optlen
)
443 struct sock
*sk
=sock
->sk
;
450 * Options without arguments
453 #ifdef SO_DONTLINGER /* Compatibility item... */
454 if (optname
== SO_DONTLINGER
) {
456 sock_reset_flag(sk
, SOCK_LINGER
);
462 if (optname
== SO_BINDTODEVICE
)
463 return sock_bindtodevice(sk
, optval
, optlen
);
465 if (optlen
< sizeof(int))
468 if (get_user(val
, (int __user
*)optval
))
477 if (val
&& !capable(CAP_NET_ADMIN
)) {
480 sock_valbool_flag(sk
, SOCK_DBG
, valbool
);
483 sk
->sk_reuse
= valbool
;
490 sock_valbool_flag(sk
, SOCK_LOCALROUTE
, valbool
);
493 sock_valbool_flag(sk
, SOCK_BROADCAST
, valbool
);
496 /* Don't error on this BSD doesn't and if you think
497 about it this is right. Otherwise apps have to
498 play 'guess the biggest size' games. RCVBUF/SNDBUF
499 are treated in BSD as hints */
501 if (val
> sysctl_wmem_max
)
502 val
= sysctl_wmem_max
;
504 sk
->sk_userlocks
|= SOCK_SNDBUF_LOCK
;
505 if ((val
* 2) < SOCK_MIN_SNDBUF
)
506 sk
->sk_sndbuf
= SOCK_MIN_SNDBUF
;
508 sk
->sk_sndbuf
= val
* 2;
511 * Wake up sending tasks if we
514 sk
->sk_write_space(sk
);
518 if (!capable(CAP_NET_ADMIN
)) {
525 /* Don't error on this BSD doesn't and if you think
526 about it this is right. Otherwise apps have to
527 play 'guess the biggest size' games. RCVBUF/SNDBUF
528 are treated in BSD as hints */
530 if (val
> sysctl_rmem_max
)
531 val
= sysctl_rmem_max
;
533 sk
->sk_userlocks
|= SOCK_RCVBUF_LOCK
;
535 * We double it on the way in to account for
536 * "struct sk_buff" etc. overhead. Applications
537 * assume that the SO_RCVBUF setting they make will
538 * allow that much actual data to be received on that
541 * Applications are unaware that "struct sk_buff" and
542 * other overheads allocate from the receive buffer
543 * during socket buffer allocation.
545 * And after considering the possible alternatives,
546 * returning the value we actually used in getsockopt
547 * is the most desirable behavior.
549 if ((val
* 2) < SOCK_MIN_RCVBUF
)
550 sk
->sk_rcvbuf
= SOCK_MIN_RCVBUF
;
552 sk
->sk_rcvbuf
= val
* 2;
556 if (!capable(CAP_NET_ADMIN
)) {
564 if (sk
->sk_protocol
== IPPROTO_TCP
)
565 tcp_set_keepalive(sk
, valbool
);
567 sock_valbool_flag(sk
, SOCK_KEEPOPEN
, valbool
);
571 sock_valbool_flag(sk
, SOCK_URGINLINE
, valbool
);
575 sk
->sk_no_check
= valbool
;
579 if ((val
>= 0 && val
<= 6) || capable(CAP_NET_ADMIN
))
580 sk
->sk_priority
= val
;
586 if (optlen
< sizeof(ling
)) {
587 ret
= -EINVAL
; /* 1003.1g */
590 if (copy_from_user(&ling
,optval
,sizeof(ling
))) {
595 sock_reset_flag(sk
, SOCK_LINGER
);
597 #if (BITS_PER_LONG == 32)
598 if ((unsigned int)ling
.l_linger
>= MAX_SCHEDULE_TIMEOUT
/HZ
)
599 sk
->sk_lingertime
= MAX_SCHEDULE_TIMEOUT
;
602 sk
->sk_lingertime
= (unsigned int)ling
.l_linger
* HZ
;
603 sock_set_flag(sk
, SOCK_LINGER
);
608 sock_warn_obsolete_bsdism("setsockopt");
613 set_bit(SOCK_PASSCRED
, &sock
->flags
);
615 clear_bit(SOCK_PASSCRED
, &sock
->flags
);
621 if (optname
== SO_TIMESTAMP
)
622 sock_reset_flag(sk
, SOCK_RCVTSTAMPNS
);
624 sock_set_flag(sk
, SOCK_RCVTSTAMPNS
);
625 sock_set_flag(sk
, SOCK_RCVTSTAMP
);
626 sock_enable_timestamp(sk
);
628 sock_reset_flag(sk
, SOCK_RCVTSTAMP
);
629 sock_reset_flag(sk
, SOCK_RCVTSTAMPNS
);
636 sk
->sk_rcvlowat
= val
? : 1;
640 ret
= sock_set_timeout(&sk
->sk_rcvtimeo
, optval
, optlen
);
644 ret
= sock_set_timeout(&sk
->sk_sndtimeo
, optval
, optlen
);
647 case SO_ATTACH_FILTER
:
649 if (optlen
== sizeof(struct sock_fprog
)) {
650 struct sock_fprog fprog
;
653 if (copy_from_user(&fprog
, optval
, sizeof(fprog
)))
656 ret
= sk_attach_filter(&fprog
, sk
);
660 case SO_DETACH_FILTER
:
661 ret
= sk_detach_filter(sk
);
666 set_bit(SOCK_PASSSEC
, &sock
->flags
);
668 clear_bit(SOCK_PASSSEC
, &sock
->flags
);
671 if (!capable(CAP_NET_ADMIN
))
678 /* We implement the SO_SNDLOWAT etc to
679 not be settable (1003.1g 5.3) */
689 int sock_getsockopt(struct socket
*sock
, int level
, int optname
,
690 char __user
*optval
, int __user
*optlen
)
692 struct sock
*sk
= sock
->sk
;
700 unsigned int lv
= sizeof(int);
703 if (get_user(len
, optlen
))
710 v
.val
= sock_flag(sk
, SOCK_DBG
);
714 v
.val
= sock_flag(sk
, SOCK_LOCALROUTE
);
718 v
.val
= !!sock_flag(sk
, SOCK_BROADCAST
);
722 v
.val
= sk
->sk_sndbuf
;
726 v
.val
= sk
->sk_rcvbuf
;
730 v
.val
= sk
->sk_reuse
;
734 v
.val
= !!sock_flag(sk
, SOCK_KEEPOPEN
);
742 v
.val
= -sock_error(sk
);
744 v
.val
= xchg(&sk
->sk_err_soft
, 0);
748 v
.val
= !!sock_flag(sk
, SOCK_URGINLINE
);
752 v
.val
= sk
->sk_no_check
;
756 v
.val
= sk
->sk_priority
;
761 v
.ling
.l_onoff
= !!sock_flag(sk
, SOCK_LINGER
);
762 v
.ling
.l_linger
= sk
->sk_lingertime
/ HZ
;
766 sock_warn_obsolete_bsdism("getsockopt");
770 v
.val
= sock_flag(sk
, SOCK_RCVTSTAMP
) &&
771 !sock_flag(sk
, SOCK_RCVTSTAMPNS
);
775 v
.val
= sock_flag(sk
, SOCK_RCVTSTAMPNS
);
779 lv
=sizeof(struct timeval
);
780 if (sk
->sk_rcvtimeo
== MAX_SCHEDULE_TIMEOUT
) {
784 v
.tm
.tv_sec
= sk
->sk_rcvtimeo
/ HZ
;
785 v
.tm
.tv_usec
= ((sk
->sk_rcvtimeo
% HZ
) * 1000000) / HZ
;
790 lv
=sizeof(struct timeval
);
791 if (sk
->sk_sndtimeo
== MAX_SCHEDULE_TIMEOUT
) {
795 v
.tm
.tv_sec
= sk
->sk_sndtimeo
/ HZ
;
796 v
.tm
.tv_usec
= ((sk
->sk_sndtimeo
% HZ
) * 1000000) / HZ
;
801 v
.val
= sk
->sk_rcvlowat
;
809 v
.val
= test_bit(SOCK_PASSCRED
, &sock
->flags
) ? 1 : 0;
813 if (len
> sizeof(sk
->sk_peercred
))
814 len
= sizeof(sk
->sk_peercred
);
815 if (copy_to_user(optval
, &sk
->sk_peercred
, len
))
823 if (sock
->ops
->getname(sock
, (struct sockaddr
*)address
, &lv
, 2))
827 if (copy_to_user(optval
, address
, len
))
832 /* Dubious BSD thing... Probably nobody even uses it, but
833 * the UNIX standard wants it for whatever reason... -DaveM
836 v
.val
= sk
->sk_state
== TCP_LISTEN
;
840 v
.val
= test_bit(SOCK_PASSSEC
, &sock
->flags
) ? 1 : 0;
844 return security_socket_getpeersec_stream(sock
, optval
, optlen
, len
);
856 if (copy_to_user(optval
, &v
, len
))
859 if (put_user(len
, optlen
))
865 * Initialize an sk_lock.
867 * (We also register the sk_lock with the lock validator.)
869 static inline void sock_lock_init(struct sock
*sk
)
871 sock_lock_init_class_and_name(sk
,
872 af_family_slock_key_strings
[sk
->sk_family
],
873 af_family_slock_keys
+ sk
->sk_family
,
874 af_family_key_strings
[sk
->sk_family
],
875 af_family_keys
+ sk
->sk_family
);
878 static void sock_copy(struct sock
*nsk
, const struct sock
*osk
)
880 #ifdef CONFIG_SECURITY_NETWORK
881 void *sptr
= nsk
->sk_security
;
884 memcpy(nsk
, osk
, osk
->sk_prot
->obj_size
);
885 #ifdef CONFIG_SECURITY_NETWORK
886 nsk
->sk_security
= sptr
;
887 security_sk_clone(osk
, nsk
);
891 static struct sock
*sk_prot_alloc(struct proto
*prot
, gfp_t priority
,
895 struct kmem_cache
*slab
;
899 sk
= kmem_cache_alloc(slab
, priority
);
901 sk
= kmalloc(prot
->obj_size
, priority
);
904 if (security_sk_alloc(sk
, family
, priority
))
907 if (!try_module_get(prot
->owner
))
914 security_sk_free(sk
);
917 kmem_cache_free(slab
, sk
);
923 static void sk_prot_free(struct proto
*prot
, struct sock
*sk
)
925 struct kmem_cache
*slab
;
926 struct module
*owner
;
931 security_sk_free(sk
);
933 kmem_cache_free(slab
, sk
);
940 * sk_alloc - All socket objects are allocated here
941 * @net: the applicable net namespace
942 * @family: protocol family
943 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
944 * @prot: struct proto associated with this new sock instance
945 * @zero_it: if we should zero the newly allocated sock
947 struct sock
*sk_alloc(struct net
*net
, int family
, gfp_t priority
,
952 sk
= sk_prot_alloc(prot
, priority
| __GFP_ZERO
, family
);
954 sk
->sk_family
= family
;
956 * See comment in struct sock definition to understand
957 * why we need sk_prot_creator -acme
959 sk
->sk_prot
= sk
->sk_prot_creator
= prot
;
961 sk
->sk_net
= get_net(net
);
967 void sk_free(struct sock
*sk
)
969 struct sk_filter
*filter
;
974 filter
= rcu_dereference(sk
->sk_filter
);
976 sk_filter_uncharge(sk
, filter
);
977 rcu_assign_pointer(sk
->sk_filter
, NULL
);
980 sock_disable_timestamp(sk
);
982 if (atomic_read(&sk
->sk_omem_alloc
))
983 printk(KERN_DEBUG
"%s: optmem leakage (%d bytes) detected.\n",
984 __func__
, atomic_read(&sk
->sk_omem_alloc
));
987 sk_prot_free(sk
->sk_prot_creator
, sk
);
991 * Last sock_put should drop referrence to sk->sk_net. It has already
992 * been dropped in sk_change_net. Taking referrence to stopping namespace
994 * Take referrence to a socket to remove it from hash _alive_ and after that
995 * destroy it in the context of init_net.
997 void sk_release_kernel(struct sock
*sk
)
999 if (sk
== NULL
|| sk
->sk_socket
== NULL
)
1003 sock_release(sk
->sk_socket
);
1004 sk
->sk_net
= get_net(&init_net
);
1007 EXPORT_SYMBOL(sk_release_kernel
);
1009 struct sock
*sk_clone(const struct sock
*sk
, const gfp_t priority
)
1013 newsk
= sk_prot_alloc(sk
->sk_prot
, priority
, sk
->sk_family
);
1014 if (newsk
!= NULL
) {
1015 struct sk_filter
*filter
;
1017 sock_copy(newsk
, sk
);
1020 get_net(newsk
->sk_net
);
1021 sk_node_init(&newsk
->sk_node
);
1022 sock_lock_init(newsk
);
1023 bh_lock_sock(newsk
);
1024 newsk
->sk_backlog
.head
= newsk
->sk_backlog
.tail
= NULL
;
1026 atomic_set(&newsk
->sk_rmem_alloc
, 0);
1027 atomic_set(&newsk
->sk_wmem_alloc
, 0);
1028 atomic_set(&newsk
->sk_omem_alloc
, 0);
1029 skb_queue_head_init(&newsk
->sk_receive_queue
);
1030 skb_queue_head_init(&newsk
->sk_write_queue
);
1031 #ifdef CONFIG_NET_DMA
1032 skb_queue_head_init(&newsk
->sk_async_wait_queue
);
1035 rwlock_init(&newsk
->sk_dst_lock
);
1036 rwlock_init(&newsk
->sk_callback_lock
);
1037 lockdep_set_class_and_name(&newsk
->sk_callback_lock
,
1038 af_callback_keys
+ newsk
->sk_family
,
1039 af_family_clock_key_strings
[newsk
->sk_family
]);
1041 newsk
->sk_dst_cache
= NULL
;
1042 newsk
->sk_wmem_queued
= 0;
1043 newsk
->sk_forward_alloc
= 0;
1044 newsk
->sk_send_head
= NULL
;
1045 newsk
->sk_userlocks
= sk
->sk_userlocks
& ~SOCK_BINDPORT_LOCK
;
1047 sock_reset_flag(newsk
, SOCK_DONE
);
1048 skb_queue_head_init(&newsk
->sk_error_queue
);
1050 filter
= newsk
->sk_filter
;
1052 sk_filter_charge(newsk
, filter
);
1054 if (unlikely(xfrm_sk_clone_policy(newsk
))) {
1055 /* It is still raw copy of parent, so invalidate
1056 * destructor and make plain sk_free() */
1057 newsk
->sk_destruct
= NULL
;
1064 newsk
->sk_priority
= 0;
1065 atomic_set(&newsk
->sk_refcnt
, 2);
1068 * Increment the counter in the same struct proto as the master
1069 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
1070 * is the same as sk->sk_prot->socks, as this field was copied
1073 * This _changes_ the previous behaviour, where
1074 * tcp_create_openreq_child always was incrementing the
1075 * equivalent to tcp_prot->socks (inet_sock_nr), so this have
1076 * to be taken into account in all callers. -acme
1078 sk_refcnt_debug_inc(newsk
);
1079 newsk
->sk_socket
= NULL
;
1080 newsk
->sk_sleep
= NULL
;
1082 if (newsk
->sk_prot
->sockets_allocated
)
1083 atomic_inc(newsk
->sk_prot
->sockets_allocated
);
1089 EXPORT_SYMBOL_GPL(sk_clone
);
1091 void sk_setup_caps(struct sock
*sk
, struct dst_entry
*dst
)
1093 __sk_dst_set(sk
, dst
);
1094 sk
->sk_route_caps
= dst
->dev
->features
;
1095 if (sk
->sk_route_caps
& NETIF_F_GSO
)
1096 sk
->sk_route_caps
|= NETIF_F_GSO_SOFTWARE
;
1097 if (sk_can_gso(sk
)) {
1098 if (dst
->header_len
) {
1099 sk
->sk_route_caps
&= ~NETIF_F_GSO_MASK
;
1101 sk
->sk_route_caps
|= NETIF_F_SG
| NETIF_F_HW_CSUM
;
1102 sk
->sk_gso_max_size
= dst
->dev
->gso_max_size
;
1106 EXPORT_SYMBOL_GPL(sk_setup_caps
);
1108 void __init
sk_init(void)
1110 if (num_physpages
<= 4096) {
1111 sysctl_wmem_max
= 32767;
1112 sysctl_rmem_max
= 32767;
1113 sysctl_wmem_default
= 32767;
1114 sysctl_rmem_default
= 32767;
1115 } else if (num_physpages
>= 131072) {
1116 sysctl_wmem_max
= 131071;
1117 sysctl_rmem_max
= 131071;
1122 * Simple resource managers for sockets.
1127 * Write buffer destructor automatically called from kfree_skb.
1129 void sock_wfree(struct sk_buff
*skb
)
1131 struct sock
*sk
= skb
->sk
;
1133 /* In case it might be waiting for more memory. */
1134 atomic_sub(skb
->truesize
, &sk
->sk_wmem_alloc
);
1135 if (!sock_flag(sk
, SOCK_USE_WRITE_QUEUE
))
1136 sk
->sk_write_space(sk
);
1141 * Read buffer destructor automatically called from kfree_skb.
1143 void sock_rfree(struct sk_buff
*skb
)
1145 struct sock
*sk
= skb
->sk
;
1147 skb_truesize_check(skb
);
1148 atomic_sub(skb
->truesize
, &sk
->sk_rmem_alloc
);
1149 sk_mem_uncharge(skb
->sk
, skb
->truesize
);
1153 int sock_i_uid(struct sock
*sk
)
1157 read_lock(&sk
->sk_callback_lock
);
1158 uid
= sk
->sk_socket
? SOCK_INODE(sk
->sk_socket
)->i_uid
: 0;
1159 read_unlock(&sk
->sk_callback_lock
);
1163 unsigned long sock_i_ino(struct sock
*sk
)
1167 read_lock(&sk
->sk_callback_lock
);
1168 ino
= sk
->sk_socket
? SOCK_INODE(sk
->sk_socket
)->i_ino
: 0;
1169 read_unlock(&sk
->sk_callback_lock
);
1174 * Allocate a skb from the socket's send buffer.
1176 struct sk_buff
*sock_wmalloc(struct sock
*sk
, unsigned long size
, int force
,
1179 if (force
|| atomic_read(&sk
->sk_wmem_alloc
) < sk
->sk_sndbuf
) {
1180 struct sk_buff
* skb
= alloc_skb(size
, priority
);
1182 skb_set_owner_w(skb
, sk
);
1190 * Allocate a skb from the socket's receive buffer.
1192 struct sk_buff
*sock_rmalloc(struct sock
*sk
, unsigned long size
, int force
,
1195 if (force
|| atomic_read(&sk
->sk_rmem_alloc
) < sk
->sk_rcvbuf
) {
1196 struct sk_buff
*skb
= alloc_skb(size
, priority
);
1198 skb_set_owner_r(skb
, sk
);
1206 * Allocate a memory block from the socket's option memory buffer.
1208 void *sock_kmalloc(struct sock
*sk
, int size
, gfp_t priority
)
1210 if ((unsigned)size
<= sysctl_optmem_max
&&
1211 atomic_read(&sk
->sk_omem_alloc
) + size
< sysctl_optmem_max
) {
1213 /* First do the add, to avoid the race if kmalloc
1216 atomic_add(size
, &sk
->sk_omem_alloc
);
1217 mem
= kmalloc(size
, priority
);
1220 atomic_sub(size
, &sk
->sk_omem_alloc
);
1226 * Free an option memory block.
1228 void sock_kfree_s(struct sock
*sk
, void *mem
, int size
)
1231 atomic_sub(size
, &sk
->sk_omem_alloc
);
1234 /* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
1235 I think, these locks should be removed for datagram sockets.
1237 static long sock_wait_for_wmem(struct sock
* sk
, long timeo
)
1241 clear_bit(SOCK_ASYNC_NOSPACE
, &sk
->sk_socket
->flags
);
1245 if (signal_pending(current
))
1247 set_bit(SOCK_NOSPACE
, &sk
->sk_socket
->flags
);
1248 prepare_to_wait(sk
->sk_sleep
, &wait
, TASK_INTERRUPTIBLE
);
1249 if (atomic_read(&sk
->sk_wmem_alloc
) < sk
->sk_sndbuf
)
1251 if (sk
->sk_shutdown
& SEND_SHUTDOWN
)
1255 timeo
= schedule_timeout(timeo
);
1257 finish_wait(sk
->sk_sleep
, &wait
);
1263 * Generic send/receive buffer handlers
1266 static struct sk_buff
*sock_alloc_send_pskb(struct sock
*sk
,
1267 unsigned long header_len
,
1268 unsigned long data_len
,
1269 int noblock
, int *errcode
)
1271 struct sk_buff
*skb
;
1276 gfp_mask
= sk
->sk_allocation
;
1277 if (gfp_mask
& __GFP_WAIT
)
1278 gfp_mask
|= __GFP_REPEAT
;
1280 timeo
= sock_sndtimeo(sk
, noblock
);
1282 err
= sock_error(sk
);
1287 if (sk
->sk_shutdown
& SEND_SHUTDOWN
)
1290 if (atomic_read(&sk
->sk_wmem_alloc
) < sk
->sk_sndbuf
) {
1291 skb
= alloc_skb(header_len
, gfp_mask
);
1296 /* No pages, we're done... */
1300 npages
= (data_len
+ (PAGE_SIZE
- 1)) >> PAGE_SHIFT
;
1301 skb
->truesize
+= data_len
;
1302 skb_shinfo(skb
)->nr_frags
= npages
;
1303 for (i
= 0; i
< npages
; i
++) {
1307 page
= alloc_pages(sk
->sk_allocation
, 0);
1310 skb_shinfo(skb
)->nr_frags
= i
;
1315 frag
= &skb_shinfo(skb
)->frags
[i
];
1317 frag
->page_offset
= 0;
1318 frag
->size
= (data_len
>= PAGE_SIZE
?
1321 data_len
-= PAGE_SIZE
;
1324 /* Full success... */
1330 set_bit(SOCK_ASYNC_NOSPACE
, &sk
->sk_socket
->flags
);
1331 set_bit(SOCK_NOSPACE
, &sk
->sk_socket
->flags
);
1335 if (signal_pending(current
))
1337 timeo
= sock_wait_for_wmem(sk
, timeo
);
1340 skb_set_owner_w(skb
, sk
);
1344 err
= sock_intr_errno(timeo
);
1350 struct sk_buff
*sock_alloc_send_skb(struct sock
*sk
, unsigned long size
,
1351 int noblock
, int *errcode
)
1353 return sock_alloc_send_pskb(sk
, size
, 0, noblock
, errcode
);
1356 static void __lock_sock(struct sock
*sk
)
1361 prepare_to_wait_exclusive(&sk
->sk_lock
.wq
, &wait
,
1362 TASK_UNINTERRUPTIBLE
);
1363 spin_unlock_bh(&sk
->sk_lock
.slock
);
1365 spin_lock_bh(&sk
->sk_lock
.slock
);
1366 if (!sock_owned_by_user(sk
))
1369 finish_wait(&sk
->sk_lock
.wq
, &wait
);
1372 static void __release_sock(struct sock
*sk
)
1374 struct sk_buff
*skb
= sk
->sk_backlog
.head
;
1377 sk
->sk_backlog
.head
= sk
->sk_backlog
.tail
= NULL
;
1381 struct sk_buff
*next
= skb
->next
;
1384 sk
->sk_backlog_rcv(sk
, skb
);
1387 * We are in process context here with softirqs
1388 * disabled, use cond_resched_softirq() to preempt.
1389 * This is safe to do because we've taken the backlog
1392 cond_resched_softirq();
1395 } while (skb
!= NULL
);
1398 } while ((skb
= sk
->sk_backlog
.head
) != NULL
);
1402 * sk_wait_data - wait for data to arrive at sk_receive_queue
1403 * @sk: sock to wait on
1404 * @timeo: for how long
1406 * Now socket state including sk->sk_err is changed only under lock,
1407 * hence we may omit checks after joining wait queue.
1408 * We check receive queue before schedule() only as optimization;
1409 * it is very likely that release_sock() added new data.
1411 int sk_wait_data(struct sock
*sk
, long *timeo
)
1416 prepare_to_wait(sk
->sk_sleep
, &wait
, TASK_INTERRUPTIBLE
);
1417 set_bit(SOCK_ASYNC_WAITDATA
, &sk
->sk_socket
->flags
);
1418 rc
= sk_wait_event(sk
, timeo
, !skb_queue_empty(&sk
->sk_receive_queue
));
1419 clear_bit(SOCK_ASYNC_WAITDATA
, &sk
->sk_socket
->flags
);
1420 finish_wait(sk
->sk_sleep
, &wait
);
1424 EXPORT_SYMBOL(sk_wait_data
);
1427 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated
1429 * @size: memory size to allocate
1430 * @kind: allocation type
1432 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means
1433 * rmem allocation. This function assumes that protocols which have
1434 * memory_pressure use sk_wmem_queued as write buffer accounting.
1436 int __sk_mem_schedule(struct sock
*sk
, int size
, int kind
)
1438 struct proto
*prot
= sk
->sk_prot
;
1439 int amt
= sk_mem_pages(size
);
1442 sk
->sk_forward_alloc
+= amt
* SK_MEM_QUANTUM
;
1443 allocated
= atomic_add_return(amt
, prot
->memory_allocated
);
1446 if (allocated
<= prot
->sysctl_mem
[0]) {
1447 if (prot
->memory_pressure
&& *prot
->memory_pressure
)
1448 *prot
->memory_pressure
= 0;
1452 /* Under pressure. */
1453 if (allocated
> prot
->sysctl_mem
[1])
1454 if (prot
->enter_memory_pressure
)
1455 prot
->enter_memory_pressure();
1457 /* Over hard limit. */
1458 if (allocated
> prot
->sysctl_mem
[2])
1459 goto suppress_allocation
;
1461 /* guarantee minimum buffer size under pressure */
1462 if (kind
== SK_MEM_RECV
) {
1463 if (atomic_read(&sk
->sk_rmem_alloc
) < prot
->sysctl_rmem
[0])
1465 } else { /* SK_MEM_SEND */
1466 if (sk
->sk_type
== SOCK_STREAM
) {
1467 if (sk
->sk_wmem_queued
< prot
->sysctl_wmem
[0])
1469 } else if (atomic_read(&sk
->sk_wmem_alloc
) <
1470 prot
->sysctl_wmem
[0])
1474 if (prot
->memory_pressure
) {
1475 if (!*prot
->memory_pressure
||
1476 prot
->sysctl_mem
[2] > atomic_read(prot
->sockets_allocated
) *
1477 sk_mem_pages(sk
->sk_wmem_queued
+
1478 atomic_read(&sk
->sk_rmem_alloc
) +
1479 sk
->sk_forward_alloc
))
1483 suppress_allocation
:
1485 if (kind
== SK_MEM_SEND
&& sk
->sk_type
== SOCK_STREAM
) {
1486 sk_stream_moderate_sndbuf(sk
);
1488 /* Fail only if socket is _under_ its sndbuf.
1489 * In this case we cannot block, so that we have to fail.
1491 if (sk
->sk_wmem_queued
+ size
>= sk
->sk_sndbuf
)
1495 /* Alas. Undo changes. */
1496 sk
->sk_forward_alloc
-= amt
* SK_MEM_QUANTUM
;
1497 atomic_sub(amt
, prot
->memory_allocated
);
1501 EXPORT_SYMBOL(__sk_mem_schedule
);
1504 * __sk_reclaim - reclaim memory_allocated
1507 void __sk_mem_reclaim(struct sock
*sk
)
1509 struct proto
*prot
= sk
->sk_prot
;
1511 atomic_sub(sk
->sk_forward_alloc
>> SK_MEM_QUANTUM_SHIFT
,
1512 prot
->memory_allocated
);
1513 sk
->sk_forward_alloc
&= SK_MEM_QUANTUM
- 1;
1515 if (prot
->memory_pressure
&& *prot
->memory_pressure
&&
1516 (atomic_read(prot
->memory_allocated
) < prot
->sysctl_mem
[0]))
1517 *prot
->memory_pressure
= 0;
1520 EXPORT_SYMBOL(__sk_mem_reclaim
);
1524 * Set of default routines for initialising struct proto_ops when
1525 * the protocol does not support a particular function. In certain
1526 * cases where it makes no sense for a protocol to have a "do nothing"
1527 * function, some default processing is provided.
1530 int sock_no_bind(struct socket
*sock
, struct sockaddr
*saddr
, int len
)
1535 int sock_no_connect(struct socket
*sock
, struct sockaddr
*saddr
,
1541 int sock_no_socketpair(struct socket
*sock1
, struct socket
*sock2
)
1546 int sock_no_accept(struct socket
*sock
, struct socket
*newsock
, int flags
)
1551 int sock_no_getname(struct socket
*sock
, struct sockaddr
*saddr
,
1557 unsigned int sock_no_poll(struct file
* file
, struct socket
*sock
, poll_table
*pt
)
1562 int sock_no_ioctl(struct socket
*sock
, unsigned int cmd
, unsigned long arg
)
1567 int sock_no_listen(struct socket
*sock
, int backlog
)
1572 int sock_no_shutdown(struct socket
*sock
, int how
)
1577 int sock_no_setsockopt(struct socket
*sock
, int level
, int optname
,
1578 char __user
*optval
, int optlen
)
1583 int sock_no_getsockopt(struct socket
*sock
, int level
, int optname
,
1584 char __user
*optval
, int __user
*optlen
)
1589 int sock_no_sendmsg(struct kiocb
*iocb
, struct socket
*sock
, struct msghdr
*m
,
1595 int sock_no_recvmsg(struct kiocb
*iocb
, struct socket
*sock
, struct msghdr
*m
,
1596 size_t len
, int flags
)
1601 int sock_no_mmap(struct file
*file
, struct socket
*sock
, struct vm_area_struct
*vma
)
1603 /* Mirror missing mmap method error code */
1607 ssize_t
sock_no_sendpage(struct socket
*sock
, struct page
*page
, int offset
, size_t size
, int flags
)
1610 struct msghdr msg
= {.msg_flags
= flags
};
1612 char *kaddr
= kmap(page
);
1613 iov
.iov_base
= kaddr
+ offset
;
1615 res
= kernel_sendmsg(sock
, &msg
, &iov
, 1, size
);
1621 * Default Socket Callbacks
1624 static void sock_def_wakeup(struct sock
*sk
)
1626 read_lock(&sk
->sk_callback_lock
);
1627 if (sk
->sk_sleep
&& waitqueue_active(sk
->sk_sleep
))
1628 wake_up_interruptible_all(sk
->sk_sleep
);
1629 read_unlock(&sk
->sk_callback_lock
);
1632 static void sock_def_error_report(struct sock
*sk
)
1634 read_lock(&sk
->sk_callback_lock
);
1635 if (sk
->sk_sleep
&& waitqueue_active(sk
->sk_sleep
))
1636 wake_up_interruptible(sk
->sk_sleep
);
1637 sk_wake_async(sk
, SOCK_WAKE_IO
, POLL_ERR
);
1638 read_unlock(&sk
->sk_callback_lock
);
1641 static void sock_def_readable(struct sock
*sk
, int len
)
1643 read_lock(&sk
->sk_callback_lock
);
1644 if (sk
->sk_sleep
&& waitqueue_active(sk
->sk_sleep
))
1645 wake_up_interruptible(sk
->sk_sleep
);
1646 sk_wake_async(sk
, SOCK_WAKE_WAITD
, POLL_IN
);
1647 read_unlock(&sk
->sk_callback_lock
);
1650 static void sock_def_write_space(struct sock
*sk
)
1652 read_lock(&sk
->sk_callback_lock
);
1654 /* Do not wake up a writer until he can make "significant"
1657 if ((atomic_read(&sk
->sk_wmem_alloc
) << 1) <= sk
->sk_sndbuf
) {
1658 if (sk
->sk_sleep
&& waitqueue_active(sk
->sk_sleep
))
1659 wake_up_interruptible(sk
->sk_sleep
);
1661 /* Should agree with poll, otherwise some programs break */
1662 if (sock_writeable(sk
))
1663 sk_wake_async(sk
, SOCK_WAKE_SPACE
, POLL_OUT
);
1666 read_unlock(&sk
->sk_callback_lock
);
1669 static void sock_def_destruct(struct sock
*sk
)
1671 kfree(sk
->sk_protinfo
);
1674 void sk_send_sigurg(struct sock
*sk
)
1676 if (sk
->sk_socket
&& sk
->sk_socket
->file
)
1677 if (send_sigurg(&sk
->sk_socket
->file
->f_owner
))
1678 sk_wake_async(sk
, SOCK_WAKE_URG
, POLL_PRI
);
1681 void sk_reset_timer(struct sock
*sk
, struct timer_list
* timer
,
1682 unsigned long expires
)
1684 if (!mod_timer(timer
, expires
))
1688 EXPORT_SYMBOL(sk_reset_timer
);
1690 void sk_stop_timer(struct sock
*sk
, struct timer_list
* timer
)
1692 if (timer_pending(timer
) && del_timer(timer
))
1696 EXPORT_SYMBOL(sk_stop_timer
);
1698 void sock_init_data(struct socket
*sock
, struct sock
*sk
)
1700 skb_queue_head_init(&sk
->sk_receive_queue
);
1701 skb_queue_head_init(&sk
->sk_write_queue
);
1702 skb_queue_head_init(&sk
->sk_error_queue
);
1703 #ifdef CONFIG_NET_DMA
1704 skb_queue_head_init(&sk
->sk_async_wait_queue
);
1707 sk
->sk_send_head
= NULL
;
1709 init_timer(&sk
->sk_timer
);
1711 sk
->sk_allocation
= GFP_KERNEL
;
1712 sk
->sk_rcvbuf
= sysctl_rmem_default
;
1713 sk
->sk_sndbuf
= sysctl_wmem_default
;
1714 sk
->sk_state
= TCP_CLOSE
;
1715 sk
->sk_socket
= sock
;
1717 sock_set_flag(sk
, SOCK_ZAPPED
);
1720 sk
->sk_type
= sock
->type
;
1721 sk
->sk_sleep
= &sock
->wait
;
1724 sk
->sk_sleep
= NULL
;
1726 rwlock_init(&sk
->sk_dst_lock
);
1727 rwlock_init(&sk
->sk_callback_lock
);
1728 lockdep_set_class_and_name(&sk
->sk_callback_lock
,
1729 af_callback_keys
+ sk
->sk_family
,
1730 af_family_clock_key_strings
[sk
->sk_family
]);
1732 sk
->sk_state_change
= sock_def_wakeup
;
1733 sk
->sk_data_ready
= sock_def_readable
;
1734 sk
->sk_write_space
= sock_def_write_space
;
1735 sk
->sk_error_report
= sock_def_error_report
;
1736 sk
->sk_destruct
= sock_def_destruct
;
1738 sk
->sk_sndmsg_page
= NULL
;
1739 sk
->sk_sndmsg_off
= 0;
1741 sk
->sk_peercred
.pid
= 0;
1742 sk
->sk_peercred
.uid
= -1;
1743 sk
->sk_peercred
.gid
= -1;
1744 sk
->sk_write_pending
= 0;
1745 sk
->sk_rcvlowat
= 1;
1746 sk
->sk_rcvtimeo
= MAX_SCHEDULE_TIMEOUT
;
1747 sk
->sk_sndtimeo
= MAX_SCHEDULE_TIMEOUT
;
1749 sk
->sk_stamp
= ktime_set(-1L, -1L);
1751 atomic_set(&sk
->sk_refcnt
, 1);
1752 atomic_set(&sk
->sk_drops
, 0);
1755 void lock_sock_nested(struct sock
*sk
, int subclass
)
1758 spin_lock_bh(&sk
->sk_lock
.slock
);
1759 if (sk
->sk_lock
.owned
)
1761 sk
->sk_lock
.owned
= 1;
1762 spin_unlock(&sk
->sk_lock
.slock
);
1764 * The sk_lock has mutex_lock() semantics here:
1766 mutex_acquire(&sk
->sk_lock
.dep_map
, subclass
, 0, _RET_IP_
);
1770 EXPORT_SYMBOL(lock_sock_nested
);
1772 void release_sock(struct sock
*sk
)
1775 * The sk_lock has mutex_unlock() semantics:
1777 mutex_release(&sk
->sk_lock
.dep_map
, 1, _RET_IP_
);
1779 spin_lock_bh(&sk
->sk_lock
.slock
);
1780 if (sk
->sk_backlog
.tail
)
1782 sk
->sk_lock
.owned
= 0;
1783 if (waitqueue_active(&sk
->sk_lock
.wq
))
1784 wake_up(&sk
->sk_lock
.wq
);
1785 spin_unlock_bh(&sk
->sk_lock
.slock
);
1787 EXPORT_SYMBOL(release_sock
);
1789 int sock_get_timestamp(struct sock
*sk
, struct timeval __user
*userstamp
)
1792 if (!sock_flag(sk
, SOCK_TIMESTAMP
))
1793 sock_enable_timestamp(sk
);
1794 tv
= ktime_to_timeval(sk
->sk_stamp
);
1795 if (tv
.tv_sec
== -1)
1797 if (tv
.tv_sec
== 0) {
1798 sk
->sk_stamp
= ktime_get_real();
1799 tv
= ktime_to_timeval(sk
->sk_stamp
);
1801 return copy_to_user(userstamp
, &tv
, sizeof(tv
)) ? -EFAULT
: 0;
1803 EXPORT_SYMBOL(sock_get_timestamp
);
1805 int sock_get_timestampns(struct sock
*sk
, struct timespec __user
*userstamp
)
1808 if (!sock_flag(sk
, SOCK_TIMESTAMP
))
1809 sock_enable_timestamp(sk
);
1810 ts
= ktime_to_timespec(sk
->sk_stamp
);
1811 if (ts
.tv_sec
== -1)
1813 if (ts
.tv_sec
== 0) {
1814 sk
->sk_stamp
= ktime_get_real();
1815 ts
= ktime_to_timespec(sk
->sk_stamp
);
1817 return copy_to_user(userstamp
, &ts
, sizeof(ts
)) ? -EFAULT
: 0;
1819 EXPORT_SYMBOL(sock_get_timestampns
);
1821 void sock_enable_timestamp(struct sock
*sk
)
1823 if (!sock_flag(sk
, SOCK_TIMESTAMP
)) {
1824 sock_set_flag(sk
, SOCK_TIMESTAMP
);
1825 net_enable_timestamp();
1830 * Get a socket option on an socket.
1832 * FIX: POSIX 1003.1g is very ambiguous here. It states that
1833 * asynchronous errors should be reported by getsockopt. We assume
1834 * this means if you specify SO_ERROR (otherwise whats the point of it).
1836 int sock_common_getsockopt(struct socket
*sock
, int level
, int optname
,
1837 char __user
*optval
, int __user
*optlen
)
1839 struct sock
*sk
= sock
->sk
;
1841 return sk
->sk_prot
->getsockopt(sk
, level
, optname
, optval
, optlen
);
1844 EXPORT_SYMBOL(sock_common_getsockopt
);
1846 #ifdef CONFIG_COMPAT
1847 int compat_sock_common_getsockopt(struct socket
*sock
, int level
, int optname
,
1848 char __user
*optval
, int __user
*optlen
)
1850 struct sock
*sk
= sock
->sk
;
1852 if (sk
->sk_prot
->compat_getsockopt
!= NULL
)
1853 return sk
->sk_prot
->compat_getsockopt(sk
, level
, optname
,
1855 return sk
->sk_prot
->getsockopt(sk
, level
, optname
, optval
, optlen
);
1857 EXPORT_SYMBOL(compat_sock_common_getsockopt
);
1860 int sock_common_recvmsg(struct kiocb
*iocb
, struct socket
*sock
,
1861 struct msghdr
*msg
, size_t size
, int flags
)
1863 struct sock
*sk
= sock
->sk
;
1867 err
= sk
->sk_prot
->recvmsg(iocb
, sk
, msg
, size
, flags
& MSG_DONTWAIT
,
1868 flags
& ~MSG_DONTWAIT
, &addr_len
);
1870 msg
->msg_namelen
= addr_len
;
1874 EXPORT_SYMBOL(sock_common_recvmsg
);
1877 * Set socket options on an inet socket.
1879 int sock_common_setsockopt(struct socket
*sock
, int level
, int optname
,
1880 char __user
*optval
, int optlen
)
1882 struct sock
*sk
= sock
->sk
;
1884 return sk
->sk_prot
->setsockopt(sk
, level
, optname
, optval
, optlen
);
1887 EXPORT_SYMBOL(sock_common_setsockopt
);
1889 #ifdef CONFIG_COMPAT
1890 int compat_sock_common_setsockopt(struct socket
*sock
, int level
, int optname
,
1891 char __user
*optval
, int optlen
)
1893 struct sock
*sk
= sock
->sk
;
1895 if (sk
->sk_prot
->compat_setsockopt
!= NULL
)
1896 return sk
->sk_prot
->compat_setsockopt(sk
, level
, optname
,
1898 return sk
->sk_prot
->setsockopt(sk
, level
, optname
, optval
, optlen
);
1900 EXPORT_SYMBOL(compat_sock_common_setsockopt
);
1903 void sk_common_release(struct sock
*sk
)
1905 if (sk
->sk_prot
->destroy
)
1906 sk
->sk_prot
->destroy(sk
);
1909 * Observation: when sock_common_release is called, processes have
1910 * no access to socket. But net still has.
1911 * Step one, detach it from networking:
1913 * A. Remove from hash tables.
1916 sk
->sk_prot
->unhash(sk
);
1919 * In this point socket cannot receive new packets, but it is possible
1920 * that some packets are in flight because some CPU runs receiver and
1921 * did hash table lookup before we unhashed socket. They will achieve
1922 * receive queue and will be purged by socket destructor.
1924 * Also we still have packets pending on receive queue and probably,
1925 * our own packets waiting in device queues. sock_destroy will drain
1926 * receive queue, but transmitted packets will delay socket destruction
1927 * until the last reference will be released.
1932 xfrm_sk_free_policy(sk
);
1934 sk_refcnt_debug_release(sk
);
1938 EXPORT_SYMBOL(sk_common_release
);
1940 static DEFINE_RWLOCK(proto_list_lock
);
1941 static LIST_HEAD(proto_list
);
1943 int proto_register(struct proto
*prot
, int alloc_slab
)
1945 char *request_sock_slab_name
= NULL
;
1946 char *timewait_sock_slab_name
;
1948 if (sock_prot_inuse_init(prot
) != 0) {
1949 printk(KERN_CRIT
"%s: Can't alloc inuse counters!\n", prot
->name
);
1954 prot
->slab
= kmem_cache_create(prot
->name
, prot
->obj_size
, 0,
1955 SLAB_HWCACHE_ALIGN
, NULL
);
1957 if (prot
->slab
== NULL
) {
1958 printk(KERN_CRIT
"%s: Can't create sock SLAB cache!\n",
1960 goto out_free_inuse
;
1963 if (prot
->rsk_prot
!= NULL
) {
1964 static const char mask
[] = "request_sock_%s";
1966 request_sock_slab_name
= kmalloc(strlen(prot
->name
) + sizeof(mask
) - 1, GFP_KERNEL
);
1967 if (request_sock_slab_name
== NULL
)
1968 goto out_free_sock_slab
;
1970 sprintf(request_sock_slab_name
, mask
, prot
->name
);
1971 prot
->rsk_prot
->slab
= kmem_cache_create(request_sock_slab_name
,
1972 prot
->rsk_prot
->obj_size
, 0,
1973 SLAB_HWCACHE_ALIGN
, NULL
);
1975 if (prot
->rsk_prot
->slab
== NULL
) {
1976 printk(KERN_CRIT
"%s: Can't create request sock SLAB cache!\n",
1978 goto out_free_request_sock_slab_name
;
1982 if (prot
->twsk_prot
!= NULL
) {
1983 static const char mask
[] = "tw_sock_%s";
1985 timewait_sock_slab_name
= kmalloc(strlen(prot
->name
) + sizeof(mask
) - 1, GFP_KERNEL
);
1987 if (timewait_sock_slab_name
== NULL
)
1988 goto out_free_request_sock_slab
;
1990 sprintf(timewait_sock_slab_name
, mask
, prot
->name
);
1991 prot
->twsk_prot
->twsk_slab
=
1992 kmem_cache_create(timewait_sock_slab_name
,
1993 prot
->twsk_prot
->twsk_obj_size
,
1994 0, SLAB_HWCACHE_ALIGN
,
1996 if (prot
->twsk_prot
->twsk_slab
== NULL
)
1997 goto out_free_timewait_sock_slab_name
;
2001 write_lock(&proto_list_lock
);
2002 list_add(&prot
->node
, &proto_list
);
2003 write_unlock(&proto_list_lock
);
2006 out_free_timewait_sock_slab_name
:
2007 kfree(timewait_sock_slab_name
);
2008 out_free_request_sock_slab
:
2009 if (prot
->rsk_prot
&& prot
->rsk_prot
->slab
) {
2010 kmem_cache_destroy(prot
->rsk_prot
->slab
);
2011 prot
->rsk_prot
->slab
= NULL
;
2013 out_free_request_sock_slab_name
:
2014 kfree(request_sock_slab_name
);
2016 kmem_cache_destroy(prot
->slab
);
2019 sock_prot_inuse_free(prot
);
2024 EXPORT_SYMBOL(proto_register
);
2026 void proto_unregister(struct proto
*prot
)
2028 write_lock(&proto_list_lock
);
2029 list_del(&prot
->node
);
2030 write_unlock(&proto_list_lock
);
2032 sock_prot_inuse_free(prot
);
2034 if (prot
->slab
!= NULL
) {
2035 kmem_cache_destroy(prot
->slab
);
2039 if (prot
->rsk_prot
!= NULL
&& prot
->rsk_prot
->slab
!= NULL
) {
2040 const char *name
= kmem_cache_name(prot
->rsk_prot
->slab
);
2042 kmem_cache_destroy(prot
->rsk_prot
->slab
);
2044 prot
->rsk_prot
->slab
= NULL
;
2047 if (prot
->twsk_prot
!= NULL
&& prot
->twsk_prot
->twsk_slab
!= NULL
) {
2048 const char *name
= kmem_cache_name(prot
->twsk_prot
->twsk_slab
);
2050 kmem_cache_destroy(prot
->twsk_prot
->twsk_slab
);
2052 prot
->twsk_prot
->twsk_slab
= NULL
;
2056 EXPORT_SYMBOL(proto_unregister
);
2058 #ifdef CONFIG_PROC_FS
2059 static void *proto_seq_start(struct seq_file
*seq
, loff_t
*pos
)
2060 __acquires(proto_list_lock
)
2062 read_lock(&proto_list_lock
);
2063 return seq_list_start_head(&proto_list
, *pos
);
2066 static void *proto_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
2068 return seq_list_next(v
, &proto_list
, pos
);
2071 static void proto_seq_stop(struct seq_file
*seq
, void *v
)
2072 __releases(proto_list_lock
)
2074 read_unlock(&proto_list_lock
);
2077 static char proto_method_implemented(const void *method
)
2079 return method
== NULL
? 'n' : 'y';
2082 static void proto_seq_printf(struct seq_file
*seq
, struct proto
*proto
)
2084 seq_printf(seq
, "%-9s %4u %6d %6d %-3s %6u %-3s %-10s "
2085 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
2088 proto
->sockets_allocated
!= NULL
? atomic_read(proto
->sockets_allocated
) : -1,
2089 proto
->memory_allocated
!= NULL
? atomic_read(proto
->memory_allocated
) : -1,
2090 proto
->memory_pressure
!= NULL
? *proto
->memory_pressure
? "yes" : "no" : "NI",
2092 proto
->slab
== NULL
? "no" : "yes",
2093 module_name(proto
->owner
),
2094 proto_method_implemented(proto
->close
),
2095 proto_method_implemented(proto
->connect
),
2096 proto_method_implemented(proto
->disconnect
),
2097 proto_method_implemented(proto
->accept
),
2098 proto_method_implemented(proto
->ioctl
),
2099 proto_method_implemented(proto
->init
),
2100 proto_method_implemented(proto
->destroy
),
2101 proto_method_implemented(proto
->shutdown
),
2102 proto_method_implemented(proto
->setsockopt
),
2103 proto_method_implemented(proto
->getsockopt
),
2104 proto_method_implemented(proto
->sendmsg
),
2105 proto_method_implemented(proto
->recvmsg
),
2106 proto_method_implemented(proto
->sendpage
),
2107 proto_method_implemented(proto
->bind
),
2108 proto_method_implemented(proto
->backlog_rcv
),
2109 proto_method_implemented(proto
->hash
),
2110 proto_method_implemented(proto
->unhash
),
2111 proto_method_implemented(proto
->get_port
),
2112 proto_method_implemented(proto
->enter_memory_pressure
));
2115 static int proto_seq_show(struct seq_file
*seq
, void *v
)
2117 if (v
== &proto_list
)
2118 seq_printf(seq
, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
2127 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
2129 proto_seq_printf(seq
, list_entry(v
, struct proto
, node
));
2133 static const struct seq_operations proto_seq_ops
= {
2134 .start
= proto_seq_start
,
2135 .next
= proto_seq_next
,
2136 .stop
= proto_seq_stop
,
2137 .show
= proto_seq_show
,
2140 static int proto_seq_open(struct inode
*inode
, struct file
*file
)
2142 return seq_open(file
, &proto_seq_ops
);
2145 static const struct file_operations proto_seq_fops
= {
2146 .owner
= THIS_MODULE
,
2147 .open
= proto_seq_open
,
2149 .llseek
= seq_lseek
,
2150 .release
= seq_release
,
2153 static int __init
proto_init(void)
2155 /* register /proc/net/protocols */
2156 return proc_net_fops_create(&init_net
, "protocols", S_IRUGO
, &proto_seq_fops
) == NULL
? -ENOBUFS
: 0;
2159 subsys_initcall(proto_init
);
2161 #endif /* PROC_FS */
2163 EXPORT_SYMBOL(sk_alloc
);
2164 EXPORT_SYMBOL(sk_free
);
2165 EXPORT_SYMBOL(sk_send_sigurg
);
2166 EXPORT_SYMBOL(sock_alloc_send_skb
);
2167 EXPORT_SYMBOL(sock_init_data
);
2168 EXPORT_SYMBOL(sock_kfree_s
);
2169 EXPORT_SYMBOL(sock_kmalloc
);
2170 EXPORT_SYMBOL(sock_no_accept
);
2171 EXPORT_SYMBOL(sock_no_bind
);
2172 EXPORT_SYMBOL(sock_no_connect
);
2173 EXPORT_SYMBOL(sock_no_getname
);
2174 EXPORT_SYMBOL(sock_no_getsockopt
);
2175 EXPORT_SYMBOL(sock_no_ioctl
);
2176 EXPORT_SYMBOL(sock_no_listen
);
2177 EXPORT_SYMBOL(sock_no_mmap
);
2178 EXPORT_SYMBOL(sock_no_poll
);
2179 EXPORT_SYMBOL(sock_no_recvmsg
);
2180 EXPORT_SYMBOL(sock_no_sendmsg
);
2181 EXPORT_SYMBOL(sock_no_sendpage
);
2182 EXPORT_SYMBOL(sock_no_setsockopt
);
2183 EXPORT_SYMBOL(sock_no_shutdown
);
2184 EXPORT_SYMBOL(sock_no_socketpair
);
2185 EXPORT_SYMBOL(sock_rfree
);
2186 EXPORT_SYMBOL(sock_setsockopt
);
2187 EXPORT_SYMBOL(sock_wfree
);
2188 EXPORT_SYMBOL(sock_wmalloc
);
2189 EXPORT_SYMBOL(sock_i_uid
);
2190 EXPORT_SYMBOL(sock_i_ino
);
2191 EXPORT_SYMBOL(sysctl_optmem_max
);