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 __FUNCTION__
, 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
);
1008 struct sock
*sk_clone(const struct sock
*sk
, const gfp_t priority
)
1012 newsk
= sk_prot_alloc(sk
->sk_prot
, priority
, sk
->sk_family
);
1013 if (newsk
!= NULL
) {
1014 struct sk_filter
*filter
;
1016 sock_copy(newsk
, sk
);
1019 get_net(newsk
->sk_net
);
1020 sk_node_init(&newsk
->sk_node
);
1021 sock_lock_init(newsk
);
1022 bh_lock_sock(newsk
);
1023 newsk
->sk_backlog
.head
= newsk
->sk_backlog
.tail
= NULL
;
1025 atomic_set(&newsk
->sk_rmem_alloc
, 0);
1026 atomic_set(&newsk
->sk_wmem_alloc
, 0);
1027 atomic_set(&newsk
->sk_omem_alloc
, 0);
1028 skb_queue_head_init(&newsk
->sk_receive_queue
);
1029 skb_queue_head_init(&newsk
->sk_write_queue
);
1030 #ifdef CONFIG_NET_DMA
1031 skb_queue_head_init(&newsk
->sk_async_wait_queue
);
1034 rwlock_init(&newsk
->sk_dst_lock
);
1035 rwlock_init(&newsk
->sk_callback_lock
);
1036 lockdep_set_class_and_name(&newsk
->sk_callback_lock
,
1037 af_callback_keys
+ newsk
->sk_family
,
1038 af_family_clock_key_strings
[newsk
->sk_family
]);
1040 newsk
->sk_dst_cache
= NULL
;
1041 newsk
->sk_wmem_queued
= 0;
1042 newsk
->sk_forward_alloc
= 0;
1043 newsk
->sk_send_head
= NULL
;
1044 newsk
->sk_userlocks
= sk
->sk_userlocks
& ~SOCK_BINDPORT_LOCK
;
1046 sock_reset_flag(newsk
, SOCK_DONE
);
1047 skb_queue_head_init(&newsk
->sk_error_queue
);
1049 filter
= newsk
->sk_filter
;
1051 sk_filter_charge(newsk
, filter
);
1053 if (unlikely(xfrm_sk_clone_policy(newsk
))) {
1054 /* It is still raw copy of parent, so invalidate
1055 * destructor and make plain sk_free() */
1056 newsk
->sk_destruct
= NULL
;
1063 newsk
->sk_priority
= 0;
1064 atomic_set(&newsk
->sk_refcnt
, 2);
1067 * Increment the counter in the same struct proto as the master
1068 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
1069 * is the same as sk->sk_prot->socks, as this field was copied
1072 * This _changes_ the previous behaviour, where
1073 * tcp_create_openreq_child always was incrementing the
1074 * equivalent to tcp_prot->socks (inet_sock_nr), so this have
1075 * to be taken into account in all callers. -acme
1077 sk_refcnt_debug_inc(newsk
);
1078 newsk
->sk_socket
= NULL
;
1079 newsk
->sk_sleep
= NULL
;
1081 if (newsk
->sk_prot
->sockets_allocated
)
1082 atomic_inc(newsk
->sk_prot
->sockets_allocated
);
1088 EXPORT_SYMBOL_GPL(sk_clone
);
1090 void sk_setup_caps(struct sock
*sk
, struct dst_entry
*dst
)
1092 __sk_dst_set(sk
, dst
);
1093 sk
->sk_route_caps
= dst
->dev
->features
;
1094 if (sk
->sk_route_caps
& NETIF_F_GSO
)
1095 sk
->sk_route_caps
|= NETIF_F_GSO_SOFTWARE
;
1096 if (sk_can_gso(sk
)) {
1097 if (dst
->header_len
)
1098 sk
->sk_route_caps
&= ~NETIF_F_GSO_MASK
;
1100 sk
->sk_route_caps
|= NETIF_F_SG
| NETIF_F_HW_CSUM
;
1103 EXPORT_SYMBOL_GPL(sk_setup_caps
);
1105 void __init
sk_init(void)
1107 if (num_physpages
<= 4096) {
1108 sysctl_wmem_max
= 32767;
1109 sysctl_rmem_max
= 32767;
1110 sysctl_wmem_default
= 32767;
1111 sysctl_rmem_default
= 32767;
1112 } else if (num_physpages
>= 131072) {
1113 sysctl_wmem_max
= 131071;
1114 sysctl_rmem_max
= 131071;
1119 * Simple resource managers for sockets.
1124 * Write buffer destructor automatically called from kfree_skb.
1126 void sock_wfree(struct sk_buff
*skb
)
1128 struct sock
*sk
= skb
->sk
;
1130 /* In case it might be waiting for more memory. */
1131 atomic_sub(skb
->truesize
, &sk
->sk_wmem_alloc
);
1132 if (!sock_flag(sk
, SOCK_USE_WRITE_QUEUE
))
1133 sk
->sk_write_space(sk
);
1138 * Read buffer destructor automatically called from kfree_skb.
1140 void sock_rfree(struct sk_buff
*skb
)
1142 struct sock
*sk
= skb
->sk
;
1144 skb_truesize_check(skb
);
1145 atomic_sub(skb
->truesize
, &sk
->sk_rmem_alloc
);
1146 sk_mem_uncharge(skb
->sk
, skb
->truesize
);
1150 int sock_i_uid(struct sock
*sk
)
1154 read_lock(&sk
->sk_callback_lock
);
1155 uid
= sk
->sk_socket
? SOCK_INODE(sk
->sk_socket
)->i_uid
: 0;
1156 read_unlock(&sk
->sk_callback_lock
);
1160 unsigned long sock_i_ino(struct sock
*sk
)
1164 read_lock(&sk
->sk_callback_lock
);
1165 ino
= sk
->sk_socket
? SOCK_INODE(sk
->sk_socket
)->i_ino
: 0;
1166 read_unlock(&sk
->sk_callback_lock
);
1171 * Allocate a skb from the socket's send buffer.
1173 struct sk_buff
*sock_wmalloc(struct sock
*sk
, unsigned long size
, int force
,
1176 if (force
|| atomic_read(&sk
->sk_wmem_alloc
) < sk
->sk_sndbuf
) {
1177 struct sk_buff
* skb
= alloc_skb(size
, priority
);
1179 skb_set_owner_w(skb
, sk
);
1187 * Allocate a skb from the socket's receive buffer.
1189 struct sk_buff
*sock_rmalloc(struct sock
*sk
, unsigned long size
, int force
,
1192 if (force
|| atomic_read(&sk
->sk_rmem_alloc
) < sk
->sk_rcvbuf
) {
1193 struct sk_buff
*skb
= alloc_skb(size
, priority
);
1195 skb_set_owner_r(skb
, sk
);
1203 * Allocate a memory block from the socket's option memory buffer.
1205 void *sock_kmalloc(struct sock
*sk
, int size
, gfp_t priority
)
1207 if ((unsigned)size
<= sysctl_optmem_max
&&
1208 atomic_read(&sk
->sk_omem_alloc
) + size
< sysctl_optmem_max
) {
1210 /* First do the add, to avoid the race if kmalloc
1213 atomic_add(size
, &sk
->sk_omem_alloc
);
1214 mem
= kmalloc(size
, priority
);
1217 atomic_sub(size
, &sk
->sk_omem_alloc
);
1223 * Free an option memory block.
1225 void sock_kfree_s(struct sock
*sk
, void *mem
, int size
)
1228 atomic_sub(size
, &sk
->sk_omem_alloc
);
1231 /* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
1232 I think, these locks should be removed for datagram sockets.
1234 static long sock_wait_for_wmem(struct sock
* sk
, long timeo
)
1238 clear_bit(SOCK_ASYNC_NOSPACE
, &sk
->sk_socket
->flags
);
1242 if (signal_pending(current
))
1244 set_bit(SOCK_NOSPACE
, &sk
->sk_socket
->flags
);
1245 prepare_to_wait(sk
->sk_sleep
, &wait
, TASK_INTERRUPTIBLE
);
1246 if (atomic_read(&sk
->sk_wmem_alloc
) < sk
->sk_sndbuf
)
1248 if (sk
->sk_shutdown
& SEND_SHUTDOWN
)
1252 timeo
= schedule_timeout(timeo
);
1254 finish_wait(sk
->sk_sleep
, &wait
);
1260 * Generic send/receive buffer handlers
1263 static struct sk_buff
*sock_alloc_send_pskb(struct sock
*sk
,
1264 unsigned long header_len
,
1265 unsigned long data_len
,
1266 int noblock
, int *errcode
)
1268 struct sk_buff
*skb
;
1273 gfp_mask
= sk
->sk_allocation
;
1274 if (gfp_mask
& __GFP_WAIT
)
1275 gfp_mask
|= __GFP_REPEAT
;
1277 timeo
= sock_sndtimeo(sk
, noblock
);
1279 err
= sock_error(sk
);
1284 if (sk
->sk_shutdown
& SEND_SHUTDOWN
)
1287 if (atomic_read(&sk
->sk_wmem_alloc
) < sk
->sk_sndbuf
) {
1288 skb
= alloc_skb(header_len
, gfp_mask
);
1293 /* No pages, we're done... */
1297 npages
= (data_len
+ (PAGE_SIZE
- 1)) >> PAGE_SHIFT
;
1298 skb
->truesize
+= data_len
;
1299 skb_shinfo(skb
)->nr_frags
= npages
;
1300 for (i
= 0; i
< npages
; i
++) {
1304 page
= alloc_pages(sk
->sk_allocation
, 0);
1307 skb_shinfo(skb
)->nr_frags
= i
;
1312 frag
= &skb_shinfo(skb
)->frags
[i
];
1314 frag
->page_offset
= 0;
1315 frag
->size
= (data_len
>= PAGE_SIZE
?
1318 data_len
-= PAGE_SIZE
;
1321 /* Full success... */
1327 set_bit(SOCK_ASYNC_NOSPACE
, &sk
->sk_socket
->flags
);
1328 set_bit(SOCK_NOSPACE
, &sk
->sk_socket
->flags
);
1332 if (signal_pending(current
))
1334 timeo
= sock_wait_for_wmem(sk
, timeo
);
1337 skb_set_owner_w(skb
, sk
);
1341 err
= sock_intr_errno(timeo
);
1347 struct sk_buff
*sock_alloc_send_skb(struct sock
*sk
, unsigned long size
,
1348 int noblock
, int *errcode
)
1350 return sock_alloc_send_pskb(sk
, size
, 0, noblock
, errcode
);
1353 static void __lock_sock(struct sock
*sk
)
1358 prepare_to_wait_exclusive(&sk
->sk_lock
.wq
, &wait
,
1359 TASK_UNINTERRUPTIBLE
);
1360 spin_unlock_bh(&sk
->sk_lock
.slock
);
1362 spin_lock_bh(&sk
->sk_lock
.slock
);
1363 if (!sock_owned_by_user(sk
))
1366 finish_wait(&sk
->sk_lock
.wq
, &wait
);
1369 static void __release_sock(struct sock
*sk
)
1371 struct sk_buff
*skb
= sk
->sk_backlog
.head
;
1374 sk
->sk_backlog
.head
= sk
->sk_backlog
.tail
= NULL
;
1378 struct sk_buff
*next
= skb
->next
;
1381 sk
->sk_backlog_rcv(sk
, skb
);
1384 * We are in process context here with softirqs
1385 * disabled, use cond_resched_softirq() to preempt.
1386 * This is safe to do because we've taken the backlog
1389 cond_resched_softirq();
1392 } while (skb
!= NULL
);
1395 } while ((skb
= sk
->sk_backlog
.head
) != NULL
);
1399 * sk_wait_data - wait for data to arrive at sk_receive_queue
1400 * @sk: sock to wait on
1401 * @timeo: for how long
1403 * Now socket state including sk->sk_err is changed only under lock,
1404 * hence we may omit checks after joining wait queue.
1405 * We check receive queue before schedule() only as optimization;
1406 * it is very likely that release_sock() added new data.
1408 int sk_wait_data(struct sock
*sk
, long *timeo
)
1413 prepare_to_wait(sk
->sk_sleep
, &wait
, TASK_INTERRUPTIBLE
);
1414 set_bit(SOCK_ASYNC_WAITDATA
, &sk
->sk_socket
->flags
);
1415 rc
= sk_wait_event(sk
, timeo
, !skb_queue_empty(&sk
->sk_receive_queue
));
1416 clear_bit(SOCK_ASYNC_WAITDATA
, &sk
->sk_socket
->flags
);
1417 finish_wait(sk
->sk_sleep
, &wait
);
1421 EXPORT_SYMBOL(sk_wait_data
);
1424 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated
1426 * @size: memory size to allocate
1427 * @kind: allocation type
1429 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means
1430 * rmem allocation. This function assumes that protocols which have
1431 * memory_pressure use sk_wmem_queued as write buffer accounting.
1433 int __sk_mem_schedule(struct sock
*sk
, int size
, int kind
)
1435 struct proto
*prot
= sk
->sk_prot
;
1436 int amt
= sk_mem_pages(size
);
1439 sk
->sk_forward_alloc
+= amt
* SK_MEM_QUANTUM
;
1440 allocated
= atomic_add_return(amt
, prot
->memory_allocated
);
1443 if (allocated
<= prot
->sysctl_mem
[0]) {
1444 if (prot
->memory_pressure
&& *prot
->memory_pressure
)
1445 *prot
->memory_pressure
= 0;
1449 /* Under pressure. */
1450 if (allocated
> prot
->sysctl_mem
[1])
1451 if (prot
->enter_memory_pressure
)
1452 prot
->enter_memory_pressure();
1454 /* Over hard limit. */
1455 if (allocated
> prot
->sysctl_mem
[2])
1456 goto suppress_allocation
;
1458 /* guarantee minimum buffer size under pressure */
1459 if (kind
== SK_MEM_RECV
) {
1460 if (atomic_read(&sk
->sk_rmem_alloc
) < prot
->sysctl_rmem
[0])
1462 } else { /* SK_MEM_SEND */
1463 if (sk
->sk_type
== SOCK_STREAM
) {
1464 if (sk
->sk_wmem_queued
< prot
->sysctl_wmem
[0])
1466 } else if (atomic_read(&sk
->sk_wmem_alloc
) <
1467 prot
->sysctl_wmem
[0])
1471 if (prot
->memory_pressure
) {
1472 if (!*prot
->memory_pressure
||
1473 prot
->sysctl_mem
[2] > atomic_read(prot
->sockets_allocated
) *
1474 sk_mem_pages(sk
->sk_wmem_queued
+
1475 atomic_read(&sk
->sk_rmem_alloc
) +
1476 sk
->sk_forward_alloc
))
1480 suppress_allocation
:
1482 if (kind
== SK_MEM_SEND
&& sk
->sk_type
== SOCK_STREAM
) {
1483 sk_stream_moderate_sndbuf(sk
);
1485 /* Fail only if socket is _under_ its sndbuf.
1486 * In this case we cannot block, so that we have to fail.
1488 if (sk
->sk_wmem_queued
+ size
>= sk
->sk_sndbuf
)
1492 /* Alas. Undo changes. */
1493 sk
->sk_forward_alloc
-= amt
* SK_MEM_QUANTUM
;
1494 atomic_sub(amt
, prot
->memory_allocated
);
1498 EXPORT_SYMBOL(__sk_mem_schedule
);
1501 * __sk_reclaim - reclaim memory_allocated
1504 void __sk_mem_reclaim(struct sock
*sk
)
1506 struct proto
*prot
= sk
->sk_prot
;
1508 atomic_sub(sk
->sk_forward_alloc
>> SK_MEM_QUANTUM_SHIFT
,
1509 prot
->memory_allocated
);
1510 sk
->sk_forward_alloc
&= SK_MEM_QUANTUM
- 1;
1512 if (prot
->memory_pressure
&& *prot
->memory_pressure
&&
1513 (atomic_read(prot
->memory_allocated
) < prot
->sysctl_mem
[0]))
1514 *prot
->memory_pressure
= 0;
1517 EXPORT_SYMBOL(__sk_mem_reclaim
);
1521 * Set of default routines for initialising struct proto_ops when
1522 * the protocol does not support a particular function. In certain
1523 * cases where it makes no sense for a protocol to have a "do nothing"
1524 * function, some default processing is provided.
1527 int sock_no_bind(struct socket
*sock
, struct sockaddr
*saddr
, int len
)
1532 int sock_no_connect(struct socket
*sock
, struct sockaddr
*saddr
,
1538 int sock_no_socketpair(struct socket
*sock1
, struct socket
*sock2
)
1543 int sock_no_accept(struct socket
*sock
, struct socket
*newsock
, int flags
)
1548 int sock_no_getname(struct socket
*sock
, struct sockaddr
*saddr
,
1554 unsigned int sock_no_poll(struct file
* file
, struct socket
*sock
, poll_table
*pt
)
1559 int sock_no_ioctl(struct socket
*sock
, unsigned int cmd
, unsigned long arg
)
1564 int sock_no_listen(struct socket
*sock
, int backlog
)
1569 int sock_no_shutdown(struct socket
*sock
, int how
)
1574 int sock_no_setsockopt(struct socket
*sock
, int level
, int optname
,
1575 char __user
*optval
, int optlen
)
1580 int sock_no_getsockopt(struct socket
*sock
, int level
, int optname
,
1581 char __user
*optval
, int __user
*optlen
)
1586 int sock_no_sendmsg(struct kiocb
*iocb
, struct socket
*sock
, struct msghdr
*m
,
1592 int sock_no_recvmsg(struct kiocb
*iocb
, struct socket
*sock
, struct msghdr
*m
,
1593 size_t len
, int flags
)
1598 int sock_no_mmap(struct file
*file
, struct socket
*sock
, struct vm_area_struct
*vma
)
1600 /* Mirror missing mmap method error code */
1604 ssize_t
sock_no_sendpage(struct socket
*sock
, struct page
*page
, int offset
, size_t size
, int flags
)
1607 struct msghdr msg
= {.msg_flags
= flags
};
1609 char *kaddr
= kmap(page
);
1610 iov
.iov_base
= kaddr
+ offset
;
1612 res
= kernel_sendmsg(sock
, &msg
, &iov
, 1, size
);
1618 * Default Socket Callbacks
1621 static void sock_def_wakeup(struct sock
*sk
)
1623 read_lock(&sk
->sk_callback_lock
);
1624 if (sk
->sk_sleep
&& waitqueue_active(sk
->sk_sleep
))
1625 wake_up_interruptible_all(sk
->sk_sleep
);
1626 read_unlock(&sk
->sk_callback_lock
);
1629 static void sock_def_error_report(struct sock
*sk
)
1631 read_lock(&sk
->sk_callback_lock
);
1632 if (sk
->sk_sleep
&& waitqueue_active(sk
->sk_sleep
))
1633 wake_up_interruptible(sk
->sk_sleep
);
1634 sk_wake_async(sk
, SOCK_WAKE_IO
, POLL_ERR
);
1635 read_unlock(&sk
->sk_callback_lock
);
1638 static void sock_def_readable(struct sock
*sk
, int len
)
1640 read_lock(&sk
->sk_callback_lock
);
1641 if (sk
->sk_sleep
&& waitqueue_active(sk
->sk_sleep
))
1642 wake_up_interruptible(sk
->sk_sleep
);
1643 sk_wake_async(sk
, SOCK_WAKE_WAITD
, POLL_IN
);
1644 read_unlock(&sk
->sk_callback_lock
);
1647 static void sock_def_write_space(struct sock
*sk
)
1649 read_lock(&sk
->sk_callback_lock
);
1651 /* Do not wake up a writer until he can make "significant"
1654 if ((atomic_read(&sk
->sk_wmem_alloc
) << 1) <= sk
->sk_sndbuf
) {
1655 if (sk
->sk_sleep
&& waitqueue_active(sk
->sk_sleep
))
1656 wake_up_interruptible(sk
->sk_sleep
);
1658 /* Should agree with poll, otherwise some programs break */
1659 if (sock_writeable(sk
))
1660 sk_wake_async(sk
, SOCK_WAKE_SPACE
, POLL_OUT
);
1663 read_unlock(&sk
->sk_callback_lock
);
1666 static void sock_def_destruct(struct sock
*sk
)
1668 kfree(sk
->sk_protinfo
);
1671 void sk_send_sigurg(struct sock
*sk
)
1673 if (sk
->sk_socket
&& sk
->sk_socket
->file
)
1674 if (send_sigurg(&sk
->sk_socket
->file
->f_owner
))
1675 sk_wake_async(sk
, SOCK_WAKE_URG
, POLL_PRI
);
1678 void sk_reset_timer(struct sock
*sk
, struct timer_list
* timer
,
1679 unsigned long expires
)
1681 if (!mod_timer(timer
, expires
))
1685 EXPORT_SYMBOL(sk_reset_timer
);
1687 void sk_stop_timer(struct sock
*sk
, struct timer_list
* timer
)
1689 if (timer_pending(timer
) && del_timer(timer
))
1693 EXPORT_SYMBOL(sk_stop_timer
);
1695 void sock_init_data(struct socket
*sock
, struct sock
*sk
)
1697 skb_queue_head_init(&sk
->sk_receive_queue
);
1698 skb_queue_head_init(&sk
->sk_write_queue
);
1699 skb_queue_head_init(&sk
->sk_error_queue
);
1700 #ifdef CONFIG_NET_DMA
1701 skb_queue_head_init(&sk
->sk_async_wait_queue
);
1704 sk
->sk_send_head
= NULL
;
1706 init_timer(&sk
->sk_timer
);
1708 sk
->sk_allocation
= GFP_KERNEL
;
1709 sk
->sk_rcvbuf
= sysctl_rmem_default
;
1710 sk
->sk_sndbuf
= sysctl_wmem_default
;
1711 sk
->sk_state
= TCP_CLOSE
;
1712 sk
->sk_socket
= sock
;
1714 sock_set_flag(sk
, SOCK_ZAPPED
);
1717 sk
->sk_type
= sock
->type
;
1718 sk
->sk_sleep
= &sock
->wait
;
1721 sk
->sk_sleep
= NULL
;
1723 rwlock_init(&sk
->sk_dst_lock
);
1724 rwlock_init(&sk
->sk_callback_lock
);
1725 lockdep_set_class_and_name(&sk
->sk_callback_lock
,
1726 af_callback_keys
+ sk
->sk_family
,
1727 af_family_clock_key_strings
[sk
->sk_family
]);
1729 sk
->sk_state_change
= sock_def_wakeup
;
1730 sk
->sk_data_ready
= sock_def_readable
;
1731 sk
->sk_write_space
= sock_def_write_space
;
1732 sk
->sk_error_report
= sock_def_error_report
;
1733 sk
->sk_destruct
= sock_def_destruct
;
1735 sk
->sk_sndmsg_page
= NULL
;
1736 sk
->sk_sndmsg_off
= 0;
1738 sk
->sk_peercred
.pid
= 0;
1739 sk
->sk_peercred
.uid
= -1;
1740 sk
->sk_peercred
.gid
= -1;
1741 sk
->sk_write_pending
= 0;
1742 sk
->sk_rcvlowat
= 1;
1743 sk
->sk_rcvtimeo
= MAX_SCHEDULE_TIMEOUT
;
1744 sk
->sk_sndtimeo
= MAX_SCHEDULE_TIMEOUT
;
1746 sk
->sk_stamp
= ktime_set(-1L, -1L);
1748 atomic_set(&sk
->sk_refcnt
, 1);
1749 atomic_set(&sk
->sk_drops
, 0);
1752 void lock_sock_nested(struct sock
*sk
, int subclass
)
1755 spin_lock_bh(&sk
->sk_lock
.slock
);
1756 if (sk
->sk_lock
.owned
)
1758 sk
->sk_lock
.owned
= 1;
1759 spin_unlock(&sk
->sk_lock
.slock
);
1761 * The sk_lock has mutex_lock() semantics here:
1763 mutex_acquire(&sk
->sk_lock
.dep_map
, subclass
, 0, _RET_IP_
);
1767 EXPORT_SYMBOL(lock_sock_nested
);
1769 void release_sock(struct sock
*sk
)
1772 * The sk_lock has mutex_unlock() semantics:
1774 mutex_release(&sk
->sk_lock
.dep_map
, 1, _RET_IP_
);
1776 spin_lock_bh(&sk
->sk_lock
.slock
);
1777 if (sk
->sk_backlog
.tail
)
1779 sk
->sk_lock
.owned
= 0;
1780 if (waitqueue_active(&sk
->sk_lock
.wq
))
1781 wake_up(&sk
->sk_lock
.wq
);
1782 spin_unlock_bh(&sk
->sk_lock
.slock
);
1784 EXPORT_SYMBOL(release_sock
);
1786 int sock_get_timestamp(struct sock
*sk
, struct timeval __user
*userstamp
)
1789 if (!sock_flag(sk
, SOCK_TIMESTAMP
))
1790 sock_enable_timestamp(sk
);
1791 tv
= ktime_to_timeval(sk
->sk_stamp
);
1792 if (tv
.tv_sec
== -1)
1794 if (tv
.tv_sec
== 0) {
1795 sk
->sk_stamp
= ktime_get_real();
1796 tv
= ktime_to_timeval(sk
->sk_stamp
);
1798 return copy_to_user(userstamp
, &tv
, sizeof(tv
)) ? -EFAULT
: 0;
1800 EXPORT_SYMBOL(sock_get_timestamp
);
1802 int sock_get_timestampns(struct sock
*sk
, struct timespec __user
*userstamp
)
1805 if (!sock_flag(sk
, SOCK_TIMESTAMP
))
1806 sock_enable_timestamp(sk
);
1807 ts
= ktime_to_timespec(sk
->sk_stamp
);
1808 if (ts
.tv_sec
== -1)
1810 if (ts
.tv_sec
== 0) {
1811 sk
->sk_stamp
= ktime_get_real();
1812 ts
= ktime_to_timespec(sk
->sk_stamp
);
1814 return copy_to_user(userstamp
, &ts
, sizeof(ts
)) ? -EFAULT
: 0;
1816 EXPORT_SYMBOL(sock_get_timestampns
);
1818 void sock_enable_timestamp(struct sock
*sk
)
1820 if (!sock_flag(sk
, SOCK_TIMESTAMP
)) {
1821 sock_set_flag(sk
, SOCK_TIMESTAMP
);
1822 net_enable_timestamp();
1827 * Get a socket option on an socket.
1829 * FIX: POSIX 1003.1g is very ambiguous here. It states that
1830 * asynchronous errors should be reported by getsockopt. We assume
1831 * this means if you specify SO_ERROR (otherwise whats the point of it).
1833 int sock_common_getsockopt(struct socket
*sock
, int level
, int optname
,
1834 char __user
*optval
, int __user
*optlen
)
1836 struct sock
*sk
= sock
->sk
;
1838 return sk
->sk_prot
->getsockopt(sk
, level
, optname
, optval
, optlen
);
1841 EXPORT_SYMBOL(sock_common_getsockopt
);
1843 #ifdef CONFIG_COMPAT
1844 int compat_sock_common_getsockopt(struct socket
*sock
, int level
, int optname
,
1845 char __user
*optval
, int __user
*optlen
)
1847 struct sock
*sk
= sock
->sk
;
1849 if (sk
->sk_prot
->compat_getsockopt
!= NULL
)
1850 return sk
->sk_prot
->compat_getsockopt(sk
, level
, optname
,
1852 return sk
->sk_prot
->getsockopt(sk
, level
, optname
, optval
, optlen
);
1854 EXPORT_SYMBOL(compat_sock_common_getsockopt
);
1857 int sock_common_recvmsg(struct kiocb
*iocb
, struct socket
*sock
,
1858 struct msghdr
*msg
, size_t size
, int flags
)
1860 struct sock
*sk
= sock
->sk
;
1864 err
= sk
->sk_prot
->recvmsg(iocb
, sk
, msg
, size
, flags
& MSG_DONTWAIT
,
1865 flags
& ~MSG_DONTWAIT
, &addr_len
);
1867 msg
->msg_namelen
= addr_len
;
1871 EXPORT_SYMBOL(sock_common_recvmsg
);
1874 * Set socket options on an inet socket.
1876 int sock_common_setsockopt(struct socket
*sock
, int level
, int optname
,
1877 char __user
*optval
, int optlen
)
1879 struct sock
*sk
= sock
->sk
;
1881 return sk
->sk_prot
->setsockopt(sk
, level
, optname
, optval
, optlen
);
1884 EXPORT_SYMBOL(sock_common_setsockopt
);
1886 #ifdef CONFIG_COMPAT
1887 int compat_sock_common_setsockopt(struct socket
*sock
, int level
, int optname
,
1888 char __user
*optval
, int optlen
)
1890 struct sock
*sk
= sock
->sk
;
1892 if (sk
->sk_prot
->compat_setsockopt
!= NULL
)
1893 return sk
->sk_prot
->compat_setsockopt(sk
, level
, optname
,
1895 return sk
->sk_prot
->setsockopt(sk
, level
, optname
, optval
, optlen
);
1897 EXPORT_SYMBOL(compat_sock_common_setsockopt
);
1900 void sk_common_release(struct sock
*sk
)
1902 if (sk
->sk_prot
->destroy
)
1903 sk
->sk_prot
->destroy(sk
);
1906 * Observation: when sock_common_release is called, processes have
1907 * no access to socket. But net still has.
1908 * Step one, detach it from networking:
1910 * A. Remove from hash tables.
1913 sk
->sk_prot
->unhash(sk
);
1916 * In this point socket cannot receive new packets, but it is possible
1917 * that some packets are in flight because some CPU runs receiver and
1918 * did hash table lookup before we unhashed socket. They will achieve
1919 * receive queue and will be purged by socket destructor.
1921 * Also we still have packets pending on receive queue and probably,
1922 * our own packets waiting in device queues. sock_destroy will drain
1923 * receive queue, but transmitted packets will delay socket destruction
1924 * until the last reference will be released.
1929 xfrm_sk_free_policy(sk
);
1931 sk_refcnt_debug_release(sk
);
1935 EXPORT_SYMBOL(sk_common_release
);
1937 static DEFINE_RWLOCK(proto_list_lock
);
1938 static LIST_HEAD(proto_list
);
1940 int proto_register(struct proto
*prot
, int alloc_slab
)
1942 char *request_sock_slab_name
= NULL
;
1943 char *timewait_sock_slab_name
;
1945 if (sock_prot_inuse_init(prot
) != 0) {
1946 printk(KERN_CRIT
"%s: Can't alloc inuse counters!\n", prot
->name
);
1951 prot
->slab
= kmem_cache_create(prot
->name
, prot
->obj_size
, 0,
1952 SLAB_HWCACHE_ALIGN
, NULL
);
1954 if (prot
->slab
== NULL
) {
1955 printk(KERN_CRIT
"%s: Can't create sock SLAB cache!\n",
1957 goto out_free_inuse
;
1960 if (prot
->rsk_prot
!= NULL
) {
1961 static const char mask
[] = "request_sock_%s";
1963 request_sock_slab_name
= kmalloc(strlen(prot
->name
) + sizeof(mask
) - 1, GFP_KERNEL
);
1964 if (request_sock_slab_name
== NULL
)
1965 goto out_free_sock_slab
;
1967 sprintf(request_sock_slab_name
, mask
, prot
->name
);
1968 prot
->rsk_prot
->slab
= kmem_cache_create(request_sock_slab_name
,
1969 prot
->rsk_prot
->obj_size
, 0,
1970 SLAB_HWCACHE_ALIGN
, NULL
);
1972 if (prot
->rsk_prot
->slab
== NULL
) {
1973 printk(KERN_CRIT
"%s: Can't create request sock SLAB cache!\n",
1975 goto out_free_request_sock_slab_name
;
1979 if (prot
->twsk_prot
!= NULL
) {
1980 static const char mask
[] = "tw_sock_%s";
1982 timewait_sock_slab_name
= kmalloc(strlen(prot
->name
) + sizeof(mask
) - 1, GFP_KERNEL
);
1984 if (timewait_sock_slab_name
== NULL
)
1985 goto out_free_request_sock_slab
;
1987 sprintf(timewait_sock_slab_name
, mask
, prot
->name
);
1988 prot
->twsk_prot
->twsk_slab
=
1989 kmem_cache_create(timewait_sock_slab_name
,
1990 prot
->twsk_prot
->twsk_obj_size
,
1991 0, SLAB_HWCACHE_ALIGN
,
1993 if (prot
->twsk_prot
->twsk_slab
== NULL
)
1994 goto out_free_timewait_sock_slab_name
;
1998 write_lock(&proto_list_lock
);
1999 list_add(&prot
->node
, &proto_list
);
2000 write_unlock(&proto_list_lock
);
2003 out_free_timewait_sock_slab_name
:
2004 kfree(timewait_sock_slab_name
);
2005 out_free_request_sock_slab
:
2006 if (prot
->rsk_prot
&& prot
->rsk_prot
->slab
) {
2007 kmem_cache_destroy(prot
->rsk_prot
->slab
);
2008 prot
->rsk_prot
->slab
= NULL
;
2010 out_free_request_sock_slab_name
:
2011 kfree(request_sock_slab_name
);
2013 kmem_cache_destroy(prot
->slab
);
2016 sock_prot_inuse_free(prot
);
2021 EXPORT_SYMBOL(proto_register
);
2023 void proto_unregister(struct proto
*prot
)
2025 write_lock(&proto_list_lock
);
2026 list_del(&prot
->node
);
2027 write_unlock(&proto_list_lock
);
2029 sock_prot_inuse_free(prot
);
2031 if (prot
->slab
!= NULL
) {
2032 kmem_cache_destroy(prot
->slab
);
2036 if (prot
->rsk_prot
!= NULL
&& prot
->rsk_prot
->slab
!= NULL
) {
2037 const char *name
= kmem_cache_name(prot
->rsk_prot
->slab
);
2039 kmem_cache_destroy(prot
->rsk_prot
->slab
);
2041 prot
->rsk_prot
->slab
= NULL
;
2044 if (prot
->twsk_prot
!= NULL
&& prot
->twsk_prot
->twsk_slab
!= NULL
) {
2045 const char *name
= kmem_cache_name(prot
->twsk_prot
->twsk_slab
);
2047 kmem_cache_destroy(prot
->twsk_prot
->twsk_slab
);
2049 prot
->twsk_prot
->twsk_slab
= NULL
;
2053 EXPORT_SYMBOL(proto_unregister
);
2055 #ifdef CONFIG_PROC_FS
2056 static void *proto_seq_start(struct seq_file
*seq
, loff_t
*pos
)
2057 __acquires(proto_list_lock
)
2059 read_lock(&proto_list_lock
);
2060 return seq_list_start_head(&proto_list
, *pos
);
2063 static void *proto_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
2065 return seq_list_next(v
, &proto_list
, pos
);
2068 static void proto_seq_stop(struct seq_file
*seq
, void *v
)
2069 __releases(proto_list_lock
)
2071 read_unlock(&proto_list_lock
);
2074 static char proto_method_implemented(const void *method
)
2076 return method
== NULL
? 'n' : 'y';
2079 static void proto_seq_printf(struct seq_file
*seq
, struct proto
*proto
)
2081 seq_printf(seq
, "%-9s %4u %6d %6d %-3s %6u %-3s %-10s "
2082 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
2085 proto
->sockets_allocated
!= NULL
? atomic_read(proto
->sockets_allocated
) : -1,
2086 proto
->memory_allocated
!= NULL
? atomic_read(proto
->memory_allocated
) : -1,
2087 proto
->memory_pressure
!= NULL
? *proto
->memory_pressure
? "yes" : "no" : "NI",
2089 proto
->slab
== NULL
? "no" : "yes",
2090 module_name(proto
->owner
),
2091 proto_method_implemented(proto
->close
),
2092 proto_method_implemented(proto
->connect
),
2093 proto_method_implemented(proto
->disconnect
),
2094 proto_method_implemented(proto
->accept
),
2095 proto_method_implemented(proto
->ioctl
),
2096 proto_method_implemented(proto
->init
),
2097 proto_method_implemented(proto
->destroy
),
2098 proto_method_implemented(proto
->shutdown
),
2099 proto_method_implemented(proto
->setsockopt
),
2100 proto_method_implemented(proto
->getsockopt
),
2101 proto_method_implemented(proto
->sendmsg
),
2102 proto_method_implemented(proto
->recvmsg
),
2103 proto_method_implemented(proto
->sendpage
),
2104 proto_method_implemented(proto
->bind
),
2105 proto_method_implemented(proto
->backlog_rcv
),
2106 proto_method_implemented(proto
->hash
),
2107 proto_method_implemented(proto
->unhash
),
2108 proto_method_implemented(proto
->get_port
),
2109 proto_method_implemented(proto
->enter_memory_pressure
));
2112 static int proto_seq_show(struct seq_file
*seq
, void *v
)
2114 if (v
== &proto_list
)
2115 seq_printf(seq
, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
2124 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
2126 proto_seq_printf(seq
, list_entry(v
, struct proto
, node
));
2130 static const struct seq_operations proto_seq_ops
= {
2131 .start
= proto_seq_start
,
2132 .next
= proto_seq_next
,
2133 .stop
= proto_seq_stop
,
2134 .show
= proto_seq_show
,
2137 static int proto_seq_open(struct inode
*inode
, struct file
*file
)
2139 return seq_open(file
, &proto_seq_ops
);
2142 static const struct file_operations proto_seq_fops
= {
2143 .owner
= THIS_MODULE
,
2144 .open
= proto_seq_open
,
2146 .llseek
= seq_lseek
,
2147 .release
= seq_release
,
2150 static int __init
proto_init(void)
2152 /* register /proc/net/protocols */
2153 return proc_net_fops_create(&init_net
, "protocols", S_IRUGO
, &proto_seq_fops
) == NULL
? -ENOBUFS
: 0;
2156 subsys_initcall(proto_init
);
2158 #endif /* PROC_FS */
2160 EXPORT_SYMBOL(sk_alloc
);
2161 EXPORT_SYMBOL(sk_free
);
2162 EXPORT_SYMBOL(sk_send_sigurg
);
2163 EXPORT_SYMBOL(sock_alloc_send_skb
);
2164 EXPORT_SYMBOL(sock_init_data
);
2165 EXPORT_SYMBOL(sock_kfree_s
);
2166 EXPORT_SYMBOL(sock_kmalloc
);
2167 EXPORT_SYMBOL(sock_no_accept
);
2168 EXPORT_SYMBOL(sock_no_bind
);
2169 EXPORT_SYMBOL(sock_no_connect
);
2170 EXPORT_SYMBOL(sock_no_getname
);
2171 EXPORT_SYMBOL(sock_no_getsockopt
);
2172 EXPORT_SYMBOL(sock_no_ioctl
);
2173 EXPORT_SYMBOL(sock_no_listen
);
2174 EXPORT_SYMBOL(sock_no_mmap
);
2175 EXPORT_SYMBOL(sock_no_poll
);
2176 EXPORT_SYMBOL(sock_no_recvmsg
);
2177 EXPORT_SYMBOL(sock_no_sendmsg
);
2178 EXPORT_SYMBOL(sock_no_sendpage
);
2179 EXPORT_SYMBOL(sock_no_setsockopt
);
2180 EXPORT_SYMBOL(sock_no_shutdown
);
2181 EXPORT_SYMBOL(sock_no_socketpair
);
2182 EXPORT_SYMBOL(sock_rfree
);
2183 EXPORT_SYMBOL(sock_setsockopt
);
2184 EXPORT_SYMBOL(sock_wfree
);
2185 EXPORT_SYMBOL(sock_wmalloc
);
2186 EXPORT_SYMBOL(sock_i_uid
);
2187 EXPORT_SYMBOL(sock_i_ino
);
2188 EXPORT_SYMBOL(sysctl_optmem_max
);