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.
11 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
12 * Florian La Roche, <flla@stud.uni-sb.de>
13 * Alan Cox, <A.Cox@swansea.ac.uk>
16 * Alan Cox : Numerous verify_area() problems
17 * Alan Cox : Connecting on a connecting socket
18 * now returns an error for tcp.
19 * Alan Cox : sock->protocol is set correctly.
20 * and is not sometimes left as 0.
21 * Alan Cox : connect handles icmp errors on a
22 * connect properly. Unfortunately there
23 * is a restart syscall nasty there. I
24 * can't match BSD without hacking the C
25 * library. Ideas urgently sought!
26 * Alan Cox : Disallow bind() to addresses that are
27 * not ours - especially broadcast ones!!
28 * Alan Cox : Socket 1024 _IS_ ok for users. (fencepost)
29 * Alan Cox : sock_wfree/sock_rfree don't destroy sockets,
30 * instead they leave that for the DESTROY timer.
31 * Alan Cox : Clean up error flag in accept
32 * Alan Cox : TCP ack handling is buggy, the DESTROY timer
33 * was buggy. Put a remove_sock() in the handler
34 * for memory when we hit 0. Also altered the timer
35 * code. The ACK stuff can wait and needs major
37 * Alan Cox : Fixed TCP ack bug, removed remove sock
38 * and fixed timer/inet_bh race.
39 * Alan Cox : Added zapped flag for TCP
40 * Alan Cox : Move kfree_skb into skbuff.c and tidied up surplus code
41 * Alan Cox : for new sk_buff allocations wmalloc/rmalloc now call alloc_skb
42 * Alan Cox : kfree_s calls now are kfree_skbmem so we can track skb resources
43 * Alan Cox : Supports socket option broadcast now as does udp. Packet and raw need fixing.
44 * Alan Cox : Added RCVBUF,SNDBUF size setting. It suddenly occurred to me how easy it was so...
45 * Rick Sladkey : Relaxed UDP rules for matching packets.
46 * C.E.Hawkins : IFF_PROMISC/SIOCGHWADDR support
47 * Pauline Middelink : identd support
48 * Alan Cox : Fixed connect() taking signals I think.
49 * Alan Cox : SO_LINGER supported
50 * Alan Cox : Error reporting fixes
51 * Anonymous : inet_create tidied up (sk->reuse setting)
52 * Alan Cox : inet sockets don't set sk->type!
53 * Alan Cox : Split socket option code
54 * Alan Cox : Callbacks
55 * Alan Cox : Nagle flag for Charles & Johannes stuff
56 * Alex : Removed restriction on inet fioctl
57 * Alan Cox : Splitting INET from NET core
58 * Alan Cox : Fixed bogus SO_TYPE handling in getsockopt()
59 * Adam Caldwell : Missing return in SO_DONTROUTE/SO_DEBUG code
60 * Alan Cox : Split IP from generic code
61 * Alan Cox : New kfree_skbmem()
62 * Alan Cox : Make SO_DEBUG superuser only.
63 * Alan Cox : Allow anyone to clear SO_DEBUG
65 * Alan Cox : Added optimistic memory grabbing for AF_UNIX throughput.
66 * Alan Cox : Allocator for a socket is settable.
67 * Alan Cox : SO_ERROR includes soft errors.
68 * Alan Cox : Allow NULL arguments on some SO_ opts
69 * Alan Cox : Generic socket allocation to make hooks
70 * easier (suggested by Craig Metz).
71 * Michael Pall : SO_ERROR returns positive errno again
72 * Steve Whitehouse: Added default destructor to free
73 * protocol private data.
74 * Steve Whitehouse: Added various other default routines
75 * common to several socket families.
76 * Chris Evans : Call suser() check last on F_SETOWN
77 * Jay Schulist : Added SO_ATTACH_FILTER and SO_DETACH_FILTER.
78 * Andi Kleen : Add sock_kmalloc()/sock_kfree_s()
79 * Andi Kleen : Fix write_space callback
80 * Chris Evans : Security fixes - signedness again
81 * Arnaldo C. Melo : cleanups, use skb_queue_purge
86 * This program is free software; you can redistribute it and/or
87 * modify it under the terms of the GNU General Public License
88 * as published by the Free Software Foundation; either version
89 * 2 of the License, or (at your option) any later version.
92 #include <linux/capability.h>
93 #include <linux/errno.h>
94 #include <linux/types.h>
95 #include <linux/socket.h>
97 #include <linux/kernel.h>
98 #include <linux/module.h>
99 #include <linux/proc_fs.h>
100 #include <linux/seq_file.h>
101 #include <linux/sched.h>
102 #include <linux/timer.h>
103 #include <linux/string.h>
104 #include <linux/sockios.h>
105 #include <linux/net.h>
106 #include <linux/mm.h>
107 #include <linux/slab.h>
108 #include <linux/interrupt.h>
109 #include <linux/poll.h>
110 #include <linux/tcp.h>
111 #include <linux/init.h>
112 #include <linux/highmem.h>
114 #include <asm/uaccess.h>
115 #include <asm/system.h>
117 #include <linux/netdevice.h>
118 #include <net/protocol.h>
119 #include <linux/skbuff.h>
120 #include <net/net_namespace.h>
121 #include <net/request_sock.h>
122 #include <net/sock.h>
123 #include <linux/net_tstamp.h>
124 #include <net/xfrm.h>
125 #include <linux/ipsec.h>
127 #include <linux/filter.h>
134 * Each address family might have different locking rules, so we have
135 * one slock key per address family:
137 static struct lock_class_key af_family_keys
[AF_MAX
];
138 static struct lock_class_key af_family_slock_keys
[AF_MAX
];
141 * Make lock validator output more readable. (we pre-construct these
142 * strings build-time, so that runtime initialization of socket
145 static const char *const af_family_key_strings
[AF_MAX
+1] = {
146 "sk_lock-AF_UNSPEC", "sk_lock-AF_UNIX" , "sk_lock-AF_INET" ,
147 "sk_lock-AF_AX25" , "sk_lock-AF_IPX" , "sk_lock-AF_APPLETALK",
148 "sk_lock-AF_NETROM", "sk_lock-AF_BRIDGE" , "sk_lock-AF_ATMPVC" ,
149 "sk_lock-AF_X25" , "sk_lock-AF_INET6" , "sk_lock-AF_ROSE" ,
150 "sk_lock-AF_DECnet", "sk_lock-AF_NETBEUI" , "sk_lock-AF_SECURITY" ,
151 "sk_lock-AF_KEY" , "sk_lock-AF_NETLINK" , "sk_lock-AF_PACKET" ,
152 "sk_lock-AF_ASH" , "sk_lock-AF_ECONET" , "sk_lock-AF_ATMSVC" ,
153 "sk_lock-AF_RDS" , "sk_lock-AF_SNA" , "sk_lock-AF_IRDA" ,
154 "sk_lock-AF_PPPOX" , "sk_lock-AF_WANPIPE" , "sk_lock-AF_LLC" ,
155 "sk_lock-27" , "sk_lock-28" , "sk_lock-AF_CAN" ,
156 "sk_lock-AF_TIPC" , "sk_lock-AF_BLUETOOTH", "sk_lock-IUCV" ,
157 "sk_lock-AF_RXRPC" , "sk_lock-AF_ISDN" , "sk_lock-AF_PHONET" ,
158 "sk_lock-AF_IEEE802154",
161 static const char *const 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-AF_RDS" , "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_ISDN" , "slock-AF_PHONET" ,
174 "slock-AF_IEEE802154",
177 static const char *const af_family_clock_key_strings
[AF_MAX
+1] = {
178 "clock-AF_UNSPEC", "clock-AF_UNIX" , "clock-AF_INET" ,
179 "clock-AF_AX25" , "clock-AF_IPX" , "clock-AF_APPLETALK",
180 "clock-AF_NETROM", "clock-AF_BRIDGE" , "clock-AF_ATMPVC" ,
181 "clock-AF_X25" , "clock-AF_INET6" , "clock-AF_ROSE" ,
182 "clock-AF_DECnet", "clock-AF_NETBEUI" , "clock-AF_SECURITY" ,
183 "clock-AF_KEY" , "clock-AF_NETLINK" , "clock-AF_PACKET" ,
184 "clock-AF_ASH" , "clock-AF_ECONET" , "clock-AF_ATMSVC" ,
185 "clock-AF_RDS" , "clock-AF_SNA" , "clock-AF_IRDA" ,
186 "clock-AF_PPPOX" , "clock-AF_WANPIPE" , "clock-AF_LLC" ,
187 "clock-27" , "clock-28" , "clock-AF_CAN" ,
188 "clock-AF_TIPC" , "clock-AF_BLUETOOTH", "clock-AF_IUCV" ,
189 "clock-AF_RXRPC" , "clock-AF_ISDN" , "clock-AF_PHONET" ,
190 "clock-AF_IEEE802154",
195 * sk_callback_lock locking rules are per-address-family,
196 * so split the lock classes by using a per-AF key:
198 static struct lock_class_key af_callback_keys
[AF_MAX
];
200 /* Take into consideration the size of the struct sk_buff overhead in the
201 * determination of these values, since that is non-constant across
202 * platforms. This makes socket queueing behavior and performance
203 * not depend upon such differences.
205 #define _SK_MEM_PACKETS 256
206 #define _SK_MEM_OVERHEAD (sizeof(struct sk_buff) + 256)
207 #define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
208 #define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
210 /* Run time adjustable parameters. */
211 __u32 sysctl_wmem_max __read_mostly
= SK_WMEM_MAX
;
212 __u32 sysctl_rmem_max __read_mostly
= SK_RMEM_MAX
;
213 __u32 sysctl_wmem_default __read_mostly
= SK_WMEM_MAX
;
214 __u32 sysctl_rmem_default __read_mostly
= SK_RMEM_MAX
;
216 /* Maximal space eaten by iovec or ancilliary data plus some space */
217 int sysctl_optmem_max __read_mostly
= sizeof(unsigned long)*(2*UIO_MAXIOV
+512);
218 EXPORT_SYMBOL(sysctl_optmem_max
);
220 static int sock_set_timeout(long *timeo_p
, char __user
*optval
, int optlen
)
224 if (optlen
< sizeof(tv
))
226 if (copy_from_user(&tv
, optval
, sizeof(tv
)))
228 if (tv
.tv_usec
< 0 || tv
.tv_usec
>= USEC_PER_SEC
)
232 static int warned __read_mostly
;
235 if (warned
< 10 && net_ratelimit()) {
237 printk(KERN_INFO
"sock_set_timeout: `%s' (pid %d) "
238 "tries to set negative timeout\n",
239 current
->comm
, task_pid_nr(current
));
243 *timeo_p
= MAX_SCHEDULE_TIMEOUT
;
244 if (tv
.tv_sec
== 0 && tv
.tv_usec
== 0)
246 if (tv
.tv_sec
< (MAX_SCHEDULE_TIMEOUT
/HZ
- 1))
247 *timeo_p
= tv
.tv_sec
*HZ
+ (tv
.tv_usec
+(1000000/HZ
-1))/(1000000/HZ
);
251 static void sock_warn_obsolete_bsdism(const char *name
)
254 static char warncomm
[TASK_COMM_LEN
];
255 if (strcmp(warncomm
, current
->comm
) && warned
< 5) {
256 strcpy(warncomm
, current
->comm
);
257 printk(KERN_WARNING
"process `%s' is using obsolete "
258 "%s SO_BSDCOMPAT\n", warncomm
, name
);
263 static void sock_disable_timestamp(struct sock
*sk
, int flag
)
265 if (sock_flag(sk
, flag
)) {
266 sock_reset_flag(sk
, flag
);
267 if (!sock_flag(sk
, SOCK_TIMESTAMP
) &&
268 !sock_flag(sk
, SOCK_TIMESTAMPING_RX_SOFTWARE
)) {
269 net_disable_timestamp();
275 int sock_queue_rcv_skb(struct sock
*sk
, struct sk_buff
*skb
)
280 struct sk_buff_head
*list
= &sk
->sk_receive_queue
;
282 /* Cast sk->rcvbuf to unsigned... It's pointless, but reduces
283 number of warnings when compiling with -W --ANK
285 if (atomic_read(&sk
->sk_rmem_alloc
) + skb
->truesize
>=
286 (unsigned)sk
->sk_rcvbuf
) {
287 atomic_inc(&sk
->sk_drops
);
291 err
= sk_filter(sk
, skb
);
295 if (!sk_rmem_schedule(sk
, skb
->truesize
)) {
296 atomic_inc(&sk
->sk_drops
);
301 skb_set_owner_r(skb
, sk
);
303 /* Cache the SKB length before we tack it onto the receive
304 * queue. Once it is added it no longer belongs to us and
305 * may be freed by other threads of control pulling packets
310 spin_lock_irqsave(&list
->lock
, flags
);
311 skb
->dropcount
= atomic_read(&sk
->sk_drops
);
312 __skb_queue_tail(list
, skb
);
313 spin_unlock_irqrestore(&list
->lock
, flags
);
315 if (!sock_flag(sk
, SOCK_DEAD
))
316 sk
->sk_data_ready(sk
, skb_len
);
319 EXPORT_SYMBOL(sock_queue_rcv_skb
);
321 int sk_receive_skb(struct sock
*sk
, struct sk_buff
*skb
, const int nested
)
323 int rc
= NET_RX_SUCCESS
;
325 if (sk_filter(sk
, skb
))
326 goto discard_and_relse
;
331 bh_lock_sock_nested(sk
);
334 if (!sock_owned_by_user(sk
)) {
336 * trylock + unlock semantics:
338 mutex_acquire(&sk
->sk_lock
.dep_map
, 0, 1, _RET_IP_
);
340 rc
= sk_backlog_rcv(sk
, skb
);
342 mutex_release(&sk
->sk_lock
.dep_map
, 1, _RET_IP_
);
343 } else if (sk_add_backlog(sk
, skb
)) {
345 atomic_inc(&sk
->sk_drops
);
346 goto discard_and_relse
;
357 EXPORT_SYMBOL(sk_receive_skb
);
359 void sk_reset_txq(struct sock
*sk
)
361 sk_tx_queue_clear(sk
);
363 EXPORT_SYMBOL(sk_reset_txq
);
365 struct dst_entry
*__sk_dst_check(struct sock
*sk
, u32 cookie
)
367 struct dst_entry
*dst
= sk
->sk_dst_cache
;
369 if (dst
&& dst
->obsolete
&& dst
->ops
->check(dst
, cookie
) == NULL
) {
370 sk_tx_queue_clear(sk
);
371 sk
->sk_dst_cache
= NULL
;
378 EXPORT_SYMBOL(__sk_dst_check
);
380 struct dst_entry
*sk_dst_check(struct sock
*sk
, u32 cookie
)
382 struct dst_entry
*dst
= sk_dst_get(sk
);
384 if (dst
&& dst
->obsolete
&& dst
->ops
->check(dst
, cookie
) == NULL
) {
392 EXPORT_SYMBOL(sk_dst_check
);
394 static int sock_bindtodevice(struct sock
*sk
, char __user
*optval
, int optlen
)
396 int ret
= -ENOPROTOOPT
;
397 #ifdef CONFIG_NETDEVICES
398 struct net
*net
= sock_net(sk
);
399 char devname
[IFNAMSIZ
];
404 if (!capable(CAP_NET_RAW
))
411 /* Bind this socket to a particular device like "eth0",
412 * as specified in the passed interface name. If the
413 * name is "" or the option length is zero the socket
416 if (optlen
> IFNAMSIZ
- 1)
417 optlen
= IFNAMSIZ
- 1;
418 memset(devname
, 0, sizeof(devname
));
421 if (copy_from_user(devname
, optval
, optlen
))
425 if (devname
[0] != '\0') {
426 struct net_device
*dev
;
429 dev
= dev_get_by_name_rcu(net
, devname
);
431 index
= dev
->ifindex
;
439 sk
->sk_bound_dev_if
= index
;
451 static inline void sock_valbool_flag(struct sock
*sk
, int bit
, int valbool
)
454 sock_set_flag(sk
, bit
);
456 sock_reset_flag(sk
, bit
);
460 * This is meant for all protocols to use and covers goings on
461 * at the socket level. Everything here is generic.
464 int sock_setsockopt(struct socket
*sock
, int level
, int optname
,
465 char __user
*optval
, unsigned int optlen
)
467 struct sock
*sk
= sock
->sk
;
474 * Options without arguments
477 if (optname
== SO_BINDTODEVICE
)
478 return sock_bindtodevice(sk
, optval
, optlen
);
480 if (optlen
< sizeof(int))
483 if (get_user(val
, (int __user
*)optval
))
486 valbool
= val
? 1 : 0;
492 if (val
&& !capable(CAP_NET_ADMIN
))
495 sock_valbool_flag(sk
, SOCK_DBG
, valbool
);
498 sk
->sk_reuse
= valbool
;
507 sock_valbool_flag(sk
, SOCK_LOCALROUTE
, valbool
);
510 sock_valbool_flag(sk
, SOCK_BROADCAST
, valbool
);
513 /* Don't error on this BSD doesn't and if you think
514 about it this is right. Otherwise apps have to
515 play 'guess the biggest size' games. RCVBUF/SNDBUF
516 are treated in BSD as hints */
518 if (val
> sysctl_wmem_max
)
519 val
= sysctl_wmem_max
;
521 sk
->sk_userlocks
|= SOCK_SNDBUF_LOCK
;
522 if ((val
* 2) < SOCK_MIN_SNDBUF
)
523 sk
->sk_sndbuf
= SOCK_MIN_SNDBUF
;
525 sk
->sk_sndbuf
= val
* 2;
528 * Wake up sending tasks if we
531 sk
->sk_write_space(sk
);
535 if (!capable(CAP_NET_ADMIN
)) {
542 /* Don't error on this BSD doesn't and if you think
543 about it this is right. Otherwise apps have to
544 play 'guess the biggest size' games. RCVBUF/SNDBUF
545 are treated in BSD as hints */
547 if (val
> sysctl_rmem_max
)
548 val
= sysctl_rmem_max
;
550 sk
->sk_userlocks
|= SOCK_RCVBUF_LOCK
;
552 * We double it on the way in to account for
553 * "struct sk_buff" etc. overhead. Applications
554 * assume that the SO_RCVBUF setting they make will
555 * allow that much actual data to be received on that
558 * Applications are unaware that "struct sk_buff" and
559 * other overheads allocate from the receive buffer
560 * during socket buffer allocation.
562 * And after considering the possible alternatives,
563 * returning the value we actually used in getsockopt
564 * is the most desirable behavior.
566 if ((val
* 2) < SOCK_MIN_RCVBUF
)
567 sk
->sk_rcvbuf
= SOCK_MIN_RCVBUF
;
569 sk
->sk_rcvbuf
= val
* 2;
573 if (!capable(CAP_NET_ADMIN
)) {
581 if (sk
->sk_protocol
== IPPROTO_TCP
)
582 tcp_set_keepalive(sk
, valbool
);
584 sock_valbool_flag(sk
, SOCK_KEEPOPEN
, valbool
);
588 sock_valbool_flag(sk
, SOCK_URGINLINE
, valbool
);
592 sk
->sk_no_check
= valbool
;
596 if ((val
>= 0 && val
<= 6) || capable(CAP_NET_ADMIN
))
597 sk
->sk_priority
= val
;
603 if (optlen
< sizeof(ling
)) {
604 ret
= -EINVAL
; /* 1003.1g */
607 if (copy_from_user(&ling
, optval
, sizeof(ling
))) {
612 sock_reset_flag(sk
, SOCK_LINGER
);
614 #if (BITS_PER_LONG == 32)
615 if ((unsigned int)ling
.l_linger
>= MAX_SCHEDULE_TIMEOUT
/HZ
)
616 sk
->sk_lingertime
= MAX_SCHEDULE_TIMEOUT
;
619 sk
->sk_lingertime
= (unsigned int)ling
.l_linger
* HZ
;
620 sock_set_flag(sk
, SOCK_LINGER
);
625 sock_warn_obsolete_bsdism("setsockopt");
630 set_bit(SOCK_PASSCRED
, &sock
->flags
);
632 clear_bit(SOCK_PASSCRED
, &sock
->flags
);
638 if (optname
== SO_TIMESTAMP
)
639 sock_reset_flag(sk
, SOCK_RCVTSTAMPNS
);
641 sock_set_flag(sk
, SOCK_RCVTSTAMPNS
);
642 sock_set_flag(sk
, SOCK_RCVTSTAMP
);
643 sock_enable_timestamp(sk
, SOCK_TIMESTAMP
);
645 sock_reset_flag(sk
, SOCK_RCVTSTAMP
);
646 sock_reset_flag(sk
, SOCK_RCVTSTAMPNS
);
650 case SO_TIMESTAMPING
:
651 if (val
& ~SOF_TIMESTAMPING_MASK
) {
655 sock_valbool_flag(sk
, SOCK_TIMESTAMPING_TX_HARDWARE
,
656 val
& SOF_TIMESTAMPING_TX_HARDWARE
);
657 sock_valbool_flag(sk
, SOCK_TIMESTAMPING_TX_SOFTWARE
,
658 val
& SOF_TIMESTAMPING_TX_SOFTWARE
);
659 sock_valbool_flag(sk
, SOCK_TIMESTAMPING_RX_HARDWARE
,
660 val
& SOF_TIMESTAMPING_RX_HARDWARE
);
661 if (val
& SOF_TIMESTAMPING_RX_SOFTWARE
)
662 sock_enable_timestamp(sk
,
663 SOCK_TIMESTAMPING_RX_SOFTWARE
);
665 sock_disable_timestamp(sk
,
666 SOCK_TIMESTAMPING_RX_SOFTWARE
);
667 sock_valbool_flag(sk
, SOCK_TIMESTAMPING_SOFTWARE
,
668 val
& SOF_TIMESTAMPING_SOFTWARE
);
669 sock_valbool_flag(sk
, SOCK_TIMESTAMPING_SYS_HARDWARE
,
670 val
& SOF_TIMESTAMPING_SYS_HARDWARE
);
671 sock_valbool_flag(sk
, SOCK_TIMESTAMPING_RAW_HARDWARE
,
672 val
& SOF_TIMESTAMPING_RAW_HARDWARE
);
678 sk
->sk_rcvlowat
= val
? : 1;
682 ret
= sock_set_timeout(&sk
->sk_rcvtimeo
, optval
, optlen
);
686 ret
= sock_set_timeout(&sk
->sk_sndtimeo
, optval
, optlen
);
689 case SO_ATTACH_FILTER
:
691 if (optlen
== sizeof(struct sock_fprog
)) {
692 struct sock_fprog fprog
;
695 if (copy_from_user(&fprog
, optval
, sizeof(fprog
)))
698 ret
= sk_attach_filter(&fprog
, sk
);
702 case SO_DETACH_FILTER
:
703 ret
= sk_detach_filter(sk
);
708 set_bit(SOCK_PASSSEC
, &sock
->flags
);
710 clear_bit(SOCK_PASSSEC
, &sock
->flags
);
713 if (!capable(CAP_NET_ADMIN
))
719 /* We implement the SO_SNDLOWAT etc to
720 not be settable (1003.1g 5.3) */
723 sock_set_flag(sk
, SOCK_RXQ_OVFL
);
725 sock_reset_flag(sk
, SOCK_RXQ_OVFL
);
734 EXPORT_SYMBOL(sock_setsockopt
);
737 int sock_getsockopt(struct socket
*sock
, int level
, int optname
,
738 char __user
*optval
, int __user
*optlen
)
740 struct sock
*sk
= sock
->sk
;
748 unsigned int lv
= sizeof(int);
751 if (get_user(len
, optlen
))
756 memset(&v
, 0, sizeof(v
));
760 v
.val
= sock_flag(sk
, SOCK_DBG
);
764 v
.val
= sock_flag(sk
, SOCK_LOCALROUTE
);
768 v
.val
= !!sock_flag(sk
, SOCK_BROADCAST
);
772 v
.val
= sk
->sk_sndbuf
;
776 v
.val
= sk
->sk_rcvbuf
;
780 v
.val
= sk
->sk_reuse
;
784 v
.val
= !!sock_flag(sk
, SOCK_KEEPOPEN
);
792 v
.val
= sk
->sk_protocol
;
796 v
.val
= sk
->sk_family
;
800 v
.val
= -sock_error(sk
);
802 v
.val
= xchg(&sk
->sk_err_soft
, 0);
806 v
.val
= !!sock_flag(sk
, SOCK_URGINLINE
);
810 v
.val
= sk
->sk_no_check
;
814 v
.val
= sk
->sk_priority
;
819 v
.ling
.l_onoff
= !!sock_flag(sk
, SOCK_LINGER
);
820 v
.ling
.l_linger
= sk
->sk_lingertime
/ HZ
;
824 sock_warn_obsolete_bsdism("getsockopt");
828 v
.val
= sock_flag(sk
, SOCK_RCVTSTAMP
) &&
829 !sock_flag(sk
, SOCK_RCVTSTAMPNS
);
833 v
.val
= sock_flag(sk
, SOCK_RCVTSTAMPNS
);
836 case SO_TIMESTAMPING
:
838 if (sock_flag(sk
, SOCK_TIMESTAMPING_TX_HARDWARE
))
839 v
.val
|= SOF_TIMESTAMPING_TX_HARDWARE
;
840 if (sock_flag(sk
, SOCK_TIMESTAMPING_TX_SOFTWARE
))
841 v
.val
|= SOF_TIMESTAMPING_TX_SOFTWARE
;
842 if (sock_flag(sk
, SOCK_TIMESTAMPING_RX_HARDWARE
))
843 v
.val
|= SOF_TIMESTAMPING_RX_HARDWARE
;
844 if (sock_flag(sk
, SOCK_TIMESTAMPING_RX_SOFTWARE
))
845 v
.val
|= SOF_TIMESTAMPING_RX_SOFTWARE
;
846 if (sock_flag(sk
, SOCK_TIMESTAMPING_SOFTWARE
))
847 v
.val
|= SOF_TIMESTAMPING_SOFTWARE
;
848 if (sock_flag(sk
, SOCK_TIMESTAMPING_SYS_HARDWARE
))
849 v
.val
|= SOF_TIMESTAMPING_SYS_HARDWARE
;
850 if (sock_flag(sk
, SOCK_TIMESTAMPING_RAW_HARDWARE
))
851 v
.val
|= SOF_TIMESTAMPING_RAW_HARDWARE
;
855 lv
= sizeof(struct timeval
);
856 if (sk
->sk_rcvtimeo
== MAX_SCHEDULE_TIMEOUT
) {
860 v
.tm
.tv_sec
= sk
->sk_rcvtimeo
/ HZ
;
861 v
.tm
.tv_usec
= ((sk
->sk_rcvtimeo
% HZ
) * 1000000) / HZ
;
866 lv
= sizeof(struct timeval
);
867 if (sk
->sk_sndtimeo
== MAX_SCHEDULE_TIMEOUT
) {
871 v
.tm
.tv_sec
= sk
->sk_sndtimeo
/ HZ
;
872 v
.tm
.tv_usec
= ((sk
->sk_sndtimeo
% HZ
) * 1000000) / HZ
;
877 v
.val
= sk
->sk_rcvlowat
;
885 v
.val
= test_bit(SOCK_PASSCRED
, &sock
->flags
) ? 1 : 0;
889 if (len
> sizeof(sk
->sk_peercred
))
890 len
= sizeof(sk
->sk_peercred
);
891 if (copy_to_user(optval
, &sk
->sk_peercred
, len
))
899 if (sock
->ops
->getname(sock
, (struct sockaddr
*)address
, &lv
, 2))
903 if (copy_to_user(optval
, address
, len
))
908 /* Dubious BSD thing... Probably nobody even uses it, but
909 * the UNIX standard wants it for whatever reason... -DaveM
912 v
.val
= sk
->sk_state
== TCP_LISTEN
;
916 v
.val
= test_bit(SOCK_PASSSEC
, &sock
->flags
) ? 1 : 0;
920 return security_socket_getpeersec_stream(sock
, optval
, optlen
, len
);
927 v
.val
= !!sock_flag(sk
, SOCK_RXQ_OVFL
);
936 if (copy_to_user(optval
, &v
, len
))
939 if (put_user(len
, optlen
))
945 * Initialize an sk_lock.
947 * (We also register the sk_lock with the lock validator.)
949 static inline void sock_lock_init(struct sock
*sk
)
951 sock_lock_init_class_and_name(sk
,
952 af_family_slock_key_strings
[sk
->sk_family
],
953 af_family_slock_keys
+ sk
->sk_family
,
954 af_family_key_strings
[sk
->sk_family
],
955 af_family_keys
+ sk
->sk_family
);
959 * Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet,
960 * even temporarly, because of RCU lookups. sk_node should also be left as is.
962 static void sock_copy(struct sock
*nsk
, const struct sock
*osk
)
964 #ifdef CONFIG_SECURITY_NETWORK
965 void *sptr
= nsk
->sk_security
;
967 BUILD_BUG_ON(offsetof(struct sock
, sk_copy_start
) !=
968 sizeof(osk
->sk_node
) + sizeof(osk
->sk_refcnt
) +
969 sizeof(osk
->sk_tx_queue_mapping
));
970 memcpy(&nsk
->sk_copy_start
, &osk
->sk_copy_start
,
971 osk
->sk_prot
->obj_size
- offsetof(struct sock
, sk_copy_start
));
972 #ifdef CONFIG_SECURITY_NETWORK
973 nsk
->sk_security
= sptr
;
974 security_sk_clone(osk
, nsk
);
978 static struct sock
*sk_prot_alloc(struct proto
*prot
, gfp_t priority
,
982 struct kmem_cache
*slab
;
986 sk
= kmem_cache_alloc(slab
, priority
& ~__GFP_ZERO
);
989 if (priority
& __GFP_ZERO
) {
991 * caches using SLAB_DESTROY_BY_RCU should let
992 * sk_node.next un-modified. Special care is taken
993 * when initializing object to zero.
995 if (offsetof(struct sock
, sk_node
.next
) != 0)
996 memset(sk
, 0, offsetof(struct sock
, sk_node
.next
));
997 memset(&sk
->sk_node
.pprev
, 0,
998 prot
->obj_size
- offsetof(struct sock
,
1003 sk
= kmalloc(prot
->obj_size
, priority
);
1006 kmemcheck_annotate_bitfield(sk
, flags
);
1008 if (security_sk_alloc(sk
, family
, priority
))
1011 if (!try_module_get(prot
->owner
))
1013 sk_tx_queue_clear(sk
);
1019 security_sk_free(sk
);
1022 kmem_cache_free(slab
, sk
);
1028 static void sk_prot_free(struct proto
*prot
, struct sock
*sk
)
1030 struct kmem_cache
*slab
;
1031 struct module
*owner
;
1033 owner
= prot
->owner
;
1036 security_sk_free(sk
);
1038 kmem_cache_free(slab
, sk
);
1045 * sk_alloc - All socket objects are allocated here
1046 * @net: the applicable net namespace
1047 * @family: protocol family
1048 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1049 * @prot: struct proto associated with this new sock instance
1051 struct sock
*sk_alloc(struct net
*net
, int family
, gfp_t priority
,
1056 sk
= sk_prot_alloc(prot
, priority
| __GFP_ZERO
, family
);
1058 sk
->sk_family
= family
;
1060 * See comment in struct sock definition to understand
1061 * why we need sk_prot_creator -acme
1063 sk
->sk_prot
= sk
->sk_prot_creator
= prot
;
1065 sock_net_set(sk
, get_net(net
));
1066 atomic_set(&sk
->sk_wmem_alloc
, 1);
1071 EXPORT_SYMBOL(sk_alloc
);
1073 static void __sk_free(struct sock
*sk
)
1075 struct sk_filter
*filter
;
1077 if (sk
->sk_destruct
)
1078 sk
->sk_destruct(sk
);
1080 filter
= rcu_dereference(sk
->sk_filter
);
1082 sk_filter_uncharge(sk
, filter
);
1083 rcu_assign_pointer(sk
->sk_filter
, NULL
);
1086 sock_disable_timestamp(sk
, SOCK_TIMESTAMP
);
1087 sock_disable_timestamp(sk
, SOCK_TIMESTAMPING_RX_SOFTWARE
);
1089 if (atomic_read(&sk
->sk_omem_alloc
))
1090 printk(KERN_DEBUG
"%s: optmem leakage (%d bytes) detected.\n",
1091 __func__
, atomic_read(&sk
->sk_omem_alloc
));
1093 put_net(sock_net(sk
));
1094 sk_prot_free(sk
->sk_prot_creator
, sk
);
1097 void sk_free(struct sock
*sk
)
1100 * We substract one from sk_wmem_alloc and can know if
1101 * some packets are still in some tx queue.
1102 * If not null, sock_wfree() will call __sk_free(sk) later
1104 if (atomic_dec_and_test(&sk
->sk_wmem_alloc
))
1107 EXPORT_SYMBOL(sk_free
);
1110 * Last sock_put should drop referrence to sk->sk_net. It has already
1111 * been dropped in sk_change_net. Taking referrence to stopping namespace
1113 * Take referrence to a socket to remove it from hash _alive_ and after that
1114 * destroy it in the context of init_net.
1116 void sk_release_kernel(struct sock
*sk
)
1118 if (sk
== NULL
|| sk
->sk_socket
== NULL
)
1122 sock_release(sk
->sk_socket
);
1123 release_net(sock_net(sk
));
1124 sock_net_set(sk
, get_net(&init_net
));
1127 EXPORT_SYMBOL(sk_release_kernel
);
1129 struct sock
*sk_clone(const struct sock
*sk
, const gfp_t priority
)
1133 newsk
= sk_prot_alloc(sk
->sk_prot
, priority
, sk
->sk_family
);
1134 if (newsk
!= NULL
) {
1135 struct sk_filter
*filter
;
1137 sock_copy(newsk
, sk
);
1140 get_net(sock_net(newsk
));
1141 sk_node_init(&newsk
->sk_node
);
1142 sock_lock_init(newsk
);
1143 bh_lock_sock(newsk
);
1144 newsk
->sk_backlog
.head
= newsk
->sk_backlog
.tail
= NULL
;
1145 newsk
->sk_backlog
.len
= 0;
1147 atomic_set(&newsk
->sk_rmem_alloc
, 0);
1149 * sk_wmem_alloc set to one (see sk_free() and sock_wfree())
1151 atomic_set(&newsk
->sk_wmem_alloc
, 1);
1152 atomic_set(&newsk
->sk_omem_alloc
, 0);
1153 skb_queue_head_init(&newsk
->sk_receive_queue
);
1154 skb_queue_head_init(&newsk
->sk_write_queue
);
1155 #ifdef CONFIG_NET_DMA
1156 skb_queue_head_init(&newsk
->sk_async_wait_queue
);
1159 rwlock_init(&newsk
->sk_dst_lock
);
1160 rwlock_init(&newsk
->sk_callback_lock
);
1161 lockdep_set_class_and_name(&newsk
->sk_callback_lock
,
1162 af_callback_keys
+ newsk
->sk_family
,
1163 af_family_clock_key_strings
[newsk
->sk_family
]);
1165 newsk
->sk_dst_cache
= NULL
;
1166 newsk
->sk_wmem_queued
= 0;
1167 newsk
->sk_forward_alloc
= 0;
1168 newsk
->sk_send_head
= NULL
;
1169 newsk
->sk_userlocks
= sk
->sk_userlocks
& ~SOCK_BINDPORT_LOCK
;
1171 sock_reset_flag(newsk
, SOCK_DONE
);
1172 skb_queue_head_init(&newsk
->sk_error_queue
);
1174 filter
= newsk
->sk_filter
;
1176 sk_filter_charge(newsk
, filter
);
1178 if (unlikely(xfrm_sk_clone_policy(newsk
))) {
1179 /* It is still raw copy of parent, so invalidate
1180 * destructor and make plain sk_free() */
1181 newsk
->sk_destruct
= NULL
;
1188 newsk
->sk_priority
= 0;
1190 * Before updating sk_refcnt, we must commit prior changes to memory
1191 * (Documentation/RCU/rculist_nulls.txt for details)
1194 atomic_set(&newsk
->sk_refcnt
, 2);
1197 * Increment the counter in the same struct proto as the master
1198 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
1199 * is the same as sk->sk_prot->socks, as this field was copied
1202 * This _changes_ the previous behaviour, where
1203 * tcp_create_openreq_child always was incrementing the
1204 * equivalent to tcp_prot->socks (inet_sock_nr), so this have
1205 * to be taken into account in all callers. -acme
1207 sk_refcnt_debug_inc(newsk
);
1208 sk_set_socket(newsk
, NULL
);
1209 newsk
->sk_sleep
= NULL
;
1211 if (newsk
->sk_prot
->sockets_allocated
)
1212 percpu_counter_inc(newsk
->sk_prot
->sockets_allocated
);
1214 if (sock_flag(newsk
, SOCK_TIMESTAMP
) ||
1215 sock_flag(newsk
, SOCK_TIMESTAMPING_RX_SOFTWARE
))
1216 net_enable_timestamp();
1221 EXPORT_SYMBOL_GPL(sk_clone
);
1223 void sk_setup_caps(struct sock
*sk
, struct dst_entry
*dst
)
1225 __sk_dst_set(sk
, dst
);
1226 sk
->sk_route_caps
= dst
->dev
->features
;
1227 if (sk
->sk_route_caps
& NETIF_F_GSO
)
1228 sk
->sk_route_caps
|= NETIF_F_GSO_SOFTWARE
;
1229 if (sk_can_gso(sk
)) {
1230 if (dst
->header_len
) {
1231 sk
->sk_route_caps
&= ~NETIF_F_GSO_MASK
;
1233 sk
->sk_route_caps
|= NETIF_F_SG
| NETIF_F_HW_CSUM
;
1234 sk
->sk_gso_max_size
= dst
->dev
->gso_max_size
;
1238 EXPORT_SYMBOL_GPL(sk_setup_caps
);
1240 void __init
sk_init(void)
1242 if (totalram_pages
<= 4096) {
1243 sysctl_wmem_max
= 32767;
1244 sysctl_rmem_max
= 32767;
1245 sysctl_wmem_default
= 32767;
1246 sysctl_rmem_default
= 32767;
1247 } else if (totalram_pages
>= 131072) {
1248 sysctl_wmem_max
= 131071;
1249 sysctl_rmem_max
= 131071;
1254 * Simple resource managers for sockets.
1259 * Write buffer destructor automatically called from kfree_skb.
1261 void sock_wfree(struct sk_buff
*skb
)
1263 struct sock
*sk
= skb
->sk
;
1264 unsigned int len
= skb
->truesize
;
1266 if (!sock_flag(sk
, SOCK_USE_WRITE_QUEUE
)) {
1268 * Keep a reference on sk_wmem_alloc, this will be released
1269 * after sk_write_space() call
1271 atomic_sub(len
- 1, &sk
->sk_wmem_alloc
);
1272 sk
->sk_write_space(sk
);
1276 * if sk_wmem_alloc reaches 0, we must finish what sk_free()
1277 * could not do because of in-flight packets
1279 if (atomic_sub_and_test(len
, &sk
->sk_wmem_alloc
))
1282 EXPORT_SYMBOL(sock_wfree
);
1285 * Read buffer destructor automatically called from kfree_skb.
1287 void sock_rfree(struct sk_buff
*skb
)
1289 struct sock
*sk
= skb
->sk
;
1291 atomic_sub(skb
->truesize
, &sk
->sk_rmem_alloc
);
1292 sk_mem_uncharge(skb
->sk
, skb
->truesize
);
1294 EXPORT_SYMBOL(sock_rfree
);
1297 int sock_i_uid(struct sock
*sk
)
1301 read_lock(&sk
->sk_callback_lock
);
1302 uid
= sk
->sk_socket
? SOCK_INODE(sk
->sk_socket
)->i_uid
: 0;
1303 read_unlock(&sk
->sk_callback_lock
);
1306 EXPORT_SYMBOL(sock_i_uid
);
1308 unsigned long sock_i_ino(struct sock
*sk
)
1312 read_lock(&sk
->sk_callback_lock
);
1313 ino
= sk
->sk_socket
? SOCK_INODE(sk
->sk_socket
)->i_ino
: 0;
1314 read_unlock(&sk
->sk_callback_lock
);
1317 EXPORT_SYMBOL(sock_i_ino
);
1320 * Allocate a skb from the socket's send buffer.
1322 struct sk_buff
*sock_wmalloc(struct sock
*sk
, unsigned long size
, int force
,
1325 if (force
|| atomic_read(&sk
->sk_wmem_alloc
) < sk
->sk_sndbuf
) {
1326 struct sk_buff
*skb
= alloc_skb(size
, priority
);
1328 skb_set_owner_w(skb
, sk
);
1334 EXPORT_SYMBOL(sock_wmalloc
);
1337 * Allocate a skb from the socket's receive buffer.
1339 struct sk_buff
*sock_rmalloc(struct sock
*sk
, unsigned long size
, int force
,
1342 if (force
|| atomic_read(&sk
->sk_rmem_alloc
) < sk
->sk_rcvbuf
) {
1343 struct sk_buff
*skb
= alloc_skb(size
, priority
);
1345 skb_set_owner_r(skb
, sk
);
1353 * Allocate a memory block from the socket's option memory buffer.
1355 void *sock_kmalloc(struct sock
*sk
, int size
, gfp_t priority
)
1357 if ((unsigned)size
<= sysctl_optmem_max
&&
1358 atomic_read(&sk
->sk_omem_alloc
) + size
< sysctl_optmem_max
) {
1360 /* First do the add, to avoid the race if kmalloc
1363 atomic_add(size
, &sk
->sk_omem_alloc
);
1364 mem
= kmalloc(size
, priority
);
1367 atomic_sub(size
, &sk
->sk_omem_alloc
);
1371 EXPORT_SYMBOL(sock_kmalloc
);
1374 * Free an option memory block.
1376 void sock_kfree_s(struct sock
*sk
, void *mem
, int size
)
1379 atomic_sub(size
, &sk
->sk_omem_alloc
);
1381 EXPORT_SYMBOL(sock_kfree_s
);
1383 /* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
1384 I think, these locks should be removed for datagram sockets.
1386 static long sock_wait_for_wmem(struct sock
*sk
, long timeo
)
1390 clear_bit(SOCK_ASYNC_NOSPACE
, &sk
->sk_socket
->flags
);
1394 if (signal_pending(current
))
1396 set_bit(SOCK_NOSPACE
, &sk
->sk_socket
->flags
);
1397 prepare_to_wait(sk
->sk_sleep
, &wait
, TASK_INTERRUPTIBLE
);
1398 if (atomic_read(&sk
->sk_wmem_alloc
) < sk
->sk_sndbuf
)
1400 if (sk
->sk_shutdown
& SEND_SHUTDOWN
)
1404 timeo
= schedule_timeout(timeo
);
1406 finish_wait(sk
->sk_sleep
, &wait
);
1412 * Generic send/receive buffer handlers
1415 struct sk_buff
*sock_alloc_send_pskb(struct sock
*sk
, unsigned long header_len
,
1416 unsigned long data_len
, int noblock
,
1419 struct sk_buff
*skb
;
1424 gfp_mask
= sk
->sk_allocation
;
1425 if (gfp_mask
& __GFP_WAIT
)
1426 gfp_mask
|= __GFP_REPEAT
;
1428 timeo
= sock_sndtimeo(sk
, noblock
);
1430 err
= sock_error(sk
);
1435 if (sk
->sk_shutdown
& SEND_SHUTDOWN
)
1438 if (atomic_read(&sk
->sk_wmem_alloc
) < sk
->sk_sndbuf
) {
1439 skb
= alloc_skb(header_len
, gfp_mask
);
1444 /* No pages, we're done... */
1448 npages
= (data_len
+ (PAGE_SIZE
- 1)) >> PAGE_SHIFT
;
1449 skb
->truesize
+= data_len
;
1450 skb_shinfo(skb
)->nr_frags
= npages
;
1451 for (i
= 0; i
< npages
; i
++) {
1455 page
= alloc_pages(sk
->sk_allocation
, 0);
1458 skb_shinfo(skb
)->nr_frags
= i
;
1463 frag
= &skb_shinfo(skb
)->frags
[i
];
1465 frag
->page_offset
= 0;
1466 frag
->size
= (data_len
>= PAGE_SIZE
?
1469 data_len
-= PAGE_SIZE
;
1472 /* Full success... */
1478 set_bit(SOCK_ASYNC_NOSPACE
, &sk
->sk_socket
->flags
);
1479 set_bit(SOCK_NOSPACE
, &sk
->sk_socket
->flags
);
1483 if (signal_pending(current
))
1485 timeo
= sock_wait_for_wmem(sk
, timeo
);
1488 skb_set_owner_w(skb
, sk
);
1492 err
= sock_intr_errno(timeo
);
1497 EXPORT_SYMBOL(sock_alloc_send_pskb
);
1499 struct sk_buff
*sock_alloc_send_skb(struct sock
*sk
, unsigned long size
,
1500 int noblock
, int *errcode
)
1502 return sock_alloc_send_pskb(sk
, size
, 0, noblock
, errcode
);
1504 EXPORT_SYMBOL(sock_alloc_send_skb
);
1506 static void __lock_sock(struct sock
*sk
)
1511 prepare_to_wait_exclusive(&sk
->sk_lock
.wq
, &wait
,
1512 TASK_UNINTERRUPTIBLE
);
1513 spin_unlock_bh(&sk
->sk_lock
.slock
);
1515 spin_lock_bh(&sk
->sk_lock
.slock
);
1516 if (!sock_owned_by_user(sk
))
1519 finish_wait(&sk
->sk_lock
.wq
, &wait
);
1522 static void __release_sock(struct sock
*sk
)
1524 struct sk_buff
*skb
= sk
->sk_backlog
.head
;
1527 sk
->sk_backlog
.head
= sk
->sk_backlog
.tail
= NULL
;
1531 struct sk_buff
*next
= skb
->next
;
1534 sk_backlog_rcv(sk
, skb
);
1537 * We are in process context here with softirqs
1538 * disabled, use cond_resched_softirq() to preempt.
1539 * This is safe to do because we've taken the backlog
1542 cond_resched_softirq();
1545 } while (skb
!= NULL
);
1548 } while ((skb
= sk
->sk_backlog
.head
) != NULL
);
1551 * Doing the zeroing here guarantee we can not loop forever
1552 * while a wild producer attempts to flood us.
1554 sk
->sk_backlog
.len
= 0;
1558 * sk_wait_data - wait for data to arrive at sk_receive_queue
1559 * @sk: sock to wait on
1560 * @timeo: for how long
1562 * Now socket state including sk->sk_err is changed only under lock,
1563 * hence we may omit checks after joining wait queue.
1564 * We check receive queue before schedule() only as optimization;
1565 * it is very likely that release_sock() added new data.
1567 int sk_wait_data(struct sock
*sk
, long *timeo
)
1572 prepare_to_wait(sk
->sk_sleep
, &wait
, TASK_INTERRUPTIBLE
);
1573 set_bit(SOCK_ASYNC_WAITDATA
, &sk
->sk_socket
->flags
);
1574 rc
= sk_wait_event(sk
, timeo
, !skb_queue_empty(&sk
->sk_receive_queue
));
1575 clear_bit(SOCK_ASYNC_WAITDATA
, &sk
->sk_socket
->flags
);
1576 finish_wait(sk
->sk_sleep
, &wait
);
1579 EXPORT_SYMBOL(sk_wait_data
);
1582 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated
1584 * @size: memory size to allocate
1585 * @kind: allocation type
1587 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means
1588 * rmem allocation. This function assumes that protocols which have
1589 * memory_pressure use sk_wmem_queued as write buffer accounting.
1591 int __sk_mem_schedule(struct sock
*sk
, int size
, int kind
)
1593 struct proto
*prot
= sk
->sk_prot
;
1594 int amt
= sk_mem_pages(size
);
1597 sk
->sk_forward_alloc
+= amt
* SK_MEM_QUANTUM
;
1598 allocated
= atomic_add_return(amt
, prot
->memory_allocated
);
1601 if (allocated
<= prot
->sysctl_mem
[0]) {
1602 if (prot
->memory_pressure
&& *prot
->memory_pressure
)
1603 *prot
->memory_pressure
= 0;
1607 /* Under pressure. */
1608 if (allocated
> prot
->sysctl_mem
[1])
1609 if (prot
->enter_memory_pressure
)
1610 prot
->enter_memory_pressure(sk
);
1612 /* Over hard limit. */
1613 if (allocated
> prot
->sysctl_mem
[2])
1614 goto suppress_allocation
;
1616 /* guarantee minimum buffer size under pressure */
1617 if (kind
== SK_MEM_RECV
) {
1618 if (atomic_read(&sk
->sk_rmem_alloc
) < prot
->sysctl_rmem
[0])
1620 } else { /* SK_MEM_SEND */
1621 if (sk
->sk_type
== SOCK_STREAM
) {
1622 if (sk
->sk_wmem_queued
< prot
->sysctl_wmem
[0])
1624 } else if (atomic_read(&sk
->sk_wmem_alloc
) <
1625 prot
->sysctl_wmem
[0])
1629 if (prot
->memory_pressure
) {
1632 if (!*prot
->memory_pressure
)
1634 alloc
= percpu_counter_read_positive(prot
->sockets_allocated
);
1635 if (prot
->sysctl_mem
[2] > alloc
*
1636 sk_mem_pages(sk
->sk_wmem_queued
+
1637 atomic_read(&sk
->sk_rmem_alloc
) +
1638 sk
->sk_forward_alloc
))
1642 suppress_allocation
:
1644 if (kind
== SK_MEM_SEND
&& sk
->sk_type
== SOCK_STREAM
) {
1645 sk_stream_moderate_sndbuf(sk
);
1647 /* Fail only if socket is _under_ its sndbuf.
1648 * In this case we cannot block, so that we have to fail.
1650 if (sk
->sk_wmem_queued
+ size
>= sk
->sk_sndbuf
)
1654 /* Alas. Undo changes. */
1655 sk
->sk_forward_alloc
-= amt
* SK_MEM_QUANTUM
;
1656 atomic_sub(amt
, prot
->memory_allocated
);
1659 EXPORT_SYMBOL(__sk_mem_schedule
);
1662 * __sk_reclaim - reclaim memory_allocated
1665 void __sk_mem_reclaim(struct sock
*sk
)
1667 struct proto
*prot
= sk
->sk_prot
;
1669 atomic_sub(sk
->sk_forward_alloc
>> SK_MEM_QUANTUM_SHIFT
,
1670 prot
->memory_allocated
);
1671 sk
->sk_forward_alloc
&= SK_MEM_QUANTUM
- 1;
1673 if (prot
->memory_pressure
&& *prot
->memory_pressure
&&
1674 (atomic_read(prot
->memory_allocated
) < prot
->sysctl_mem
[0]))
1675 *prot
->memory_pressure
= 0;
1677 EXPORT_SYMBOL(__sk_mem_reclaim
);
1681 * Set of default routines for initialising struct proto_ops when
1682 * the protocol does not support a particular function. In certain
1683 * cases where it makes no sense for a protocol to have a "do nothing"
1684 * function, some default processing is provided.
1687 int sock_no_bind(struct socket
*sock
, struct sockaddr
*saddr
, int len
)
1691 EXPORT_SYMBOL(sock_no_bind
);
1693 int sock_no_connect(struct socket
*sock
, struct sockaddr
*saddr
,
1698 EXPORT_SYMBOL(sock_no_connect
);
1700 int sock_no_socketpair(struct socket
*sock1
, struct socket
*sock2
)
1704 EXPORT_SYMBOL(sock_no_socketpair
);
1706 int sock_no_accept(struct socket
*sock
, struct socket
*newsock
, int flags
)
1710 EXPORT_SYMBOL(sock_no_accept
);
1712 int sock_no_getname(struct socket
*sock
, struct sockaddr
*saddr
,
1717 EXPORT_SYMBOL(sock_no_getname
);
1719 unsigned int sock_no_poll(struct file
*file
, struct socket
*sock
, poll_table
*pt
)
1723 EXPORT_SYMBOL(sock_no_poll
);
1725 int sock_no_ioctl(struct socket
*sock
, unsigned int cmd
, unsigned long arg
)
1729 EXPORT_SYMBOL(sock_no_ioctl
);
1731 int sock_no_listen(struct socket
*sock
, int backlog
)
1735 EXPORT_SYMBOL(sock_no_listen
);
1737 int sock_no_shutdown(struct socket
*sock
, int how
)
1741 EXPORT_SYMBOL(sock_no_shutdown
);
1743 int sock_no_setsockopt(struct socket
*sock
, int level
, int optname
,
1744 char __user
*optval
, unsigned int optlen
)
1748 EXPORT_SYMBOL(sock_no_setsockopt
);
1750 int sock_no_getsockopt(struct socket
*sock
, int level
, int optname
,
1751 char __user
*optval
, int __user
*optlen
)
1755 EXPORT_SYMBOL(sock_no_getsockopt
);
1757 int sock_no_sendmsg(struct kiocb
*iocb
, struct socket
*sock
, struct msghdr
*m
,
1762 EXPORT_SYMBOL(sock_no_sendmsg
);
1764 int sock_no_recvmsg(struct kiocb
*iocb
, struct socket
*sock
, struct msghdr
*m
,
1765 size_t len
, int flags
)
1769 EXPORT_SYMBOL(sock_no_recvmsg
);
1771 int sock_no_mmap(struct file
*file
, struct socket
*sock
, struct vm_area_struct
*vma
)
1773 /* Mirror missing mmap method error code */
1776 EXPORT_SYMBOL(sock_no_mmap
);
1778 ssize_t
sock_no_sendpage(struct socket
*sock
, struct page
*page
, int offset
, size_t size
, int flags
)
1781 struct msghdr msg
= {.msg_flags
= flags
};
1783 char *kaddr
= kmap(page
);
1784 iov
.iov_base
= kaddr
+ offset
;
1786 res
= kernel_sendmsg(sock
, &msg
, &iov
, 1, size
);
1790 EXPORT_SYMBOL(sock_no_sendpage
);
1793 * Default Socket Callbacks
1796 static void sock_def_wakeup(struct sock
*sk
)
1798 read_lock(&sk
->sk_callback_lock
);
1799 if (sk_has_sleeper(sk
))
1800 wake_up_interruptible_all(sk
->sk_sleep
);
1801 read_unlock(&sk
->sk_callback_lock
);
1804 static void sock_def_error_report(struct sock
*sk
)
1806 read_lock(&sk
->sk_callback_lock
);
1807 if (sk_has_sleeper(sk
))
1808 wake_up_interruptible_poll(sk
->sk_sleep
, POLLERR
);
1809 sk_wake_async(sk
, SOCK_WAKE_IO
, POLL_ERR
);
1810 read_unlock(&sk
->sk_callback_lock
);
1813 static void sock_def_readable(struct sock
*sk
, int len
)
1815 read_lock(&sk
->sk_callback_lock
);
1816 if (sk_has_sleeper(sk
))
1817 wake_up_interruptible_sync_poll(sk
->sk_sleep
, POLLIN
|
1818 POLLRDNORM
| POLLRDBAND
);
1819 sk_wake_async(sk
, SOCK_WAKE_WAITD
, POLL_IN
);
1820 read_unlock(&sk
->sk_callback_lock
);
1823 static void sock_def_write_space(struct sock
*sk
)
1825 read_lock(&sk
->sk_callback_lock
);
1827 /* Do not wake up a writer until he can make "significant"
1830 if ((atomic_read(&sk
->sk_wmem_alloc
) << 1) <= sk
->sk_sndbuf
) {
1831 if (sk_has_sleeper(sk
))
1832 wake_up_interruptible_sync_poll(sk
->sk_sleep
, POLLOUT
|
1833 POLLWRNORM
| POLLWRBAND
);
1835 /* Should agree with poll, otherwise some programs break */
1836 if (sock_writeable(sk
))
1837 sk_wake_async(sk
, SOCK_WAKE_SPACE
, POLL_OUT
);
1840 read_unlock(&sk
->sk_callback_lock
);
1843 static void sock_def_destruct(struct sock
*sk
)
1845 kfree(sk
->sk_protinfo
);
1848 void sk_send_sigurg(struct sock
*sk
)
1850 if (sk
->sk_socket
&& sk
->sk_socket
->file
)
1851 if (send_sigurg(&sk
->sk_socket
->file
->f_owner
))
1852 sk_wake_async(sk
, SOCK_WAKE_URG
, POLL_PRI
);
1854 EXPORT_SYMBOL(sk_send_sigurg
);
1856 void sk_reset_timer(struct sock
*sk
, struct timer_list
* timer
,
1857 unsigned long expires
)
1859 if (!mod_timer(timer
, expires
))
1862 EXPORT_SYMBOL(sk_reset_timer
);
1864 void sk_stop_timer(struct sock
*sk
, struct timer_list
* timer
)
1866 if (timer_pending(timer
) && del_timer(timer
))
1869 EXPORT_SYMBOL(sk_stop_timer
);
1871 void sock_init_data(struct socket
*sock
, struct sock
*sk
)
1873 skb_queue_head_init(&sk
->sk_receive_queue
);
1874 skb_queue_head_init(&sk
->sk_write_queue
);
1875 skb_queue_head_init(&sk
->sk_error_queue
);
1876 #ifdef CONFIG_NET_DMA
1877 skb_queue_head_init(&sk
->sk_async_wait_queue
);
1880 sk
->sk_send_head
= NULL
;
1882 init_timer(&sk
->sk_timer
);
1884 sk
->sk_allocation
= GFP_KERNEL
;
1885 sk
->sk_rcvbuf
= sysctl_rmem_default
;
1886 sk
->sk_sndbuf
= sysctl_wmem_default
;
1887 sk
->sk_backlog
.limit
= sk
->sk_rcvbuf
<< 1;
1888 sk
->sk_state
= TCP_CLOSE
;
1889 sk_set_socket(sk
, sock
);
1891 sock_set_flag(sk
, SOCK_ZAPPED
);
1894 sk
->sk_type
= sock
->type
;
1895 sk
->sk_sleep
= &sock
->wait
;
1898 sk
->sk_sleep
= NULL
;
1900 rwlock_init(&sk
->sk_dst_lock
);
1901 rwlock_init(&sk
->sk_callback_lock
);
1902 lockdep_set_class_and_name(&sk
->sk_callback_lock
,
1903 af_callback_keys
+ sk
->sk_family
,
1904 af_family_clock_key_strings
[sk
->sk_family
]);
1906 sk
->sk_state_change
= sock_def_wakeup
;
1907 sk
->sk_data_ready
= sock_def_readable
;
1908 sk
->sk_write_space
= sock_def_write_space
;
1909 sk
->sk_error_report
= sock_def_error_report
;
1910 sk
->sk_destruct
= sock_def_destruct
;
1912 sk
->sk_sndmsg_page
= NULL
;
1913 sk
->sk_sndmsg_off
= 0;
1915 sk
->sk_peercred
.pid
= 0;
1916 sk
->sk_peercred
.uid
= -1;
1917 sk
->sk_peercred
.gid
= -1;
1918 sk
->sk_write_pending
= 0;
1919 sk
->sk_rcvlowat
= 1;
1920 sk
->sk_rcvtimeo
= MAX_SCHEDULE_TIMEOUT
;
1921 sk
->sk_sndtimeo
= MAX_SCHEDULE_TIMEOUT
;
1923 sk
->sk_stamp
= ktime_set(-1L, 0);
1926 * Before updating sk_refcnt, we must commit prior changes to memory
1927 * (Documentation/RCU/rculist_nulls.txt for details)
1930 atomic_set(&sk
->sk_refcnt
, 1);
1931 atomic_set(&sk
->sk_drops
, 0);
1933 EXPORT_SYMBOL(sock_init_data
);
1935 void lock_sock_nested(struct sock
*sk
, int subclass
)
1938 spin_lock_bh(&sk
->sk_lock
.slock
);
1939 if (sk
->sk_lock
.owned
)
1941 sk
->sk_lock
.owned
= 1;
1942 spin_unlock(&sk
->sk_lock
.slock
);
1944 * The sk_lock has mutex_lock() semantics here:
1946 mutex_acquire(&sk
->sk_lock
.dep_map
, subclass
, 0, _RET_IP_
);
1949 EXPORT_SYMBOL(lock_sock_nested
);
1951 void release_sock(struct sock
*sk
)
1954 * The sk_lock has mutex_unlock() semantics:
1956 mutex_release(&sk
->sk_lock
.dep_map
, 1, _RET_IP_
);
1958 spin_lock_bh(&sk
->sk_lock
.slock
);
1959 if (sk
->sk_backlog
.tail
)
1961 sk
->sk_lock
.owned
= 0;
1962 if (waitqueue_active(&sk
->sk_lock
.wq
))
1963 wake_up(&sk
->sk_lock
.wq
);
1964 spin_unlock_bh(&sk
->sk_lock
.slock
);
1966 EXPORT_SYMBOL(release_sock
);
1968 int sock_get_timestamp(struct sock
*sk
, struct timeval __user
*userstamp
)
1971 if (!sock_flag(sk
, SOCK_TIMESTAMP
))
1972 sock_enable_timestamp(sk
, SOCK_TIMESTAMP
);
1973 tv
= ktime_to_timeval(sk
->sk_stamp
);
1974 if (tv
.tv_sec
== -1)
1976 if (tv
.tv_sec
== 0) {
1977 sk
->sk_stamp
= ktime_get_real();
1978 tv
= ktime_to_timeval(sk
->sk_stamp
);
1980 return copy_to_user(userstamp
, &tv
, sizeof(tv
)) ? -EFAULT
: 0;
1982 EXPORT_SYMBOL(sock_get_timestamp
);
1984 int sock_get_timestampns(struct sock
*sk
, struct timespec __user
*userstamp
)
1987 if (!sock_flag(sk
, SOCK_TIMESTAMP
))
1988 sock_enable_timestamp(sk
, SOCK_TIMESTAMP
);
1989 ts
= ktime_to_timespec(sk
->sk_stamp
);
1990 if (ts
.tv_sec
== -1)
1992 if (ts
.tv_sec
== 0) {
1993 sk
->sk_stamp
= ktime_get_real();
1994 ts
= ktime_to_timespec(sk
->sk_stamp
);
1996 return copy_to_user(userstamp
, &ts
, sizeof(ts
)) ? -EFAULT
: 0;
1998 EXPORT_SYMBOL(sock_get_timestampns
);
2000 void sock_enable_timestamp(struct sock
*sk
, int flag
)
2002 if (!sock_flag(sk
, flag
)) {
2003 sock_set_flag(sk
, flag
);
2005 * we just set one of the two flags which require net
2006 * time stamping, but time stamping might have been on
2007 * already because of the other one
2010 flag
== SOCK_TIMESTAMP
?
2011 SOCK_TIMESTAMPING_RX_SOFTWARE
:
2013 net_enable_timestamp();
2018 * Get a socket option on an socket.
2020 * FIX: POSIX 1003.1g is very ambiguous here. It states that
2021 * asynchronous errors should be reported by getsockopt. We assume
2022 * this means if you specify SO_ERROR (otherwise whats the point of it).
2024 int sock_common_getsockopt(struct socket
*sock
, int level
, int optname
,
2025 char __user
*optval
, int __user
*optlen
)
2027 struct sock
*sk
= sock
->sk
;
2029 return sk
->sk_prot
->getsockopt(sk
, level
, optname
, optval
, optlen
);
2031 EXPORT_SYMBOL(sock_common_getsockopt
);
2033 #ifdef CONFIG_COMPAT
2034 int compat_sock_common_getsockopt(struct socket
*sock
, int level
, int optname
,
2035 char __user
*optval
, int __user
*optlen
)
2037 struct sock
*sk
= sock
->sk
;
2039 if (sk
->sk_prot
->compat_getsockopt
!= NULL
)
2040 return sk
->sk_prot
->compat_getsockopt(sk
, level
, optname
,
2042 return sk
->sk_prot
->getsockopt(sk
, level
, optname
, optval
, optlen
);
2044 EXPORT_SYMBOL(compat_sock_common_getsockopt
);
2047 int sock_common_recvmsg(struct kiocb
*iocb
, struct socket
*sock
,
2048 struct msghdr
*msg
, size_t size
, int flags
)
2050 struct sock
*sk
= sock
->sk
;
2054 err
= sk
->sk_prot
->recvmsg(iocb
, sk
, msg
, size
, flags
& MSG_DONTWAIT
,
2055 flags
& ~MSG_DONTWAIT
, &addr_len
);
2057 msg
->msg_namelen
= addr_len
;
2060 EXPORT_SYMBOL(sock_common_recvmsg
);
2063 * Set socket options on an inet socket.
2065 int sock_common_setsockopt(struct socket
*sock
, int level
, int optname
,
2066 char __user
*optval
, unsigned int optlen
)
2068 struct sock
*sk
= sock
->sk
;
2070 return sk
->sk_prot
->setsockopt(sk
, level
, optname
, optval
, optlen
);
2072 EXPORT_SYMBOL(sock_common_setsockopt
);
2074 #ifdef CONFIG_COMPAT
2075 int compat_sock_common_setsockopt(struct socket
*sock
, int level
, int optname
,
2076 char __user
*optval
, unsigned int optlen
)
2078 struct sock
*sk
= sock
->sk
;
2080 if (sk
->sk_prot
->compat_setsockopt
!= NULL
)
2081 return sk
->sk_prot
->compat_setsockopt(sk
, level
, optname
,
2083 return sk
->sk_prot
->setsockopt(sk
, level
, optname
, optval
, optlen
);
2085 EXPORT_SYMBOL(compat_sock_common_setsockopt
);
2088 void sk_common_release(struct sock
*sk
)
2090 if (sk
->sk_prot
->destroy
)
2091 sk
->sk_prot
->destroy(sk
);
2094 * Observation: when sock_common_release is called, processes have
2095 * no access to socket. But net still has.
2096 * Step one, detach it from networking:
2098 * A. Remove from hash tables.
2101 sk
->sk_prot
->unhash(sk
);
2104 * In this point socket cannot receive new packets, but it is possible
2105 * that some packets are in flight because some CPU runs receiver and
2106 * did hash table lookup before we unhashed socket. They will achieve
2107 * receive queue and will be purged by socket destructor.
2109 * Also we still have packets pending on receive queue and probably,
2110 * our own packets waiting in device queues. sock_destroy will drain
2111 * receive queue, but transmitted packets will delay socket destruction
2112 * until the last reference will be released.
2117 xfrm_sk_free_policy(sk
);
2119 sk_refcnt_debug_release(sk
);
2122 EXPORT_SYMBOL(sk_common_release
);
2124 static DEFINE_RWLOCK(proto_list_lock
);
2125 static LIST_HEAD(proto_list
);
2127 #ifdef CONFIG_PROC_FS
2128 #define PROTO_INUSE_NR 64 /* should be enough for the first time */
2130 int val
[PROTO_INUSE_NR
];
2133 static DECLARE_BITMAP(proto_inuse_idx
, PROTO_INUSE_NR
);
2135 #ifdef CONFIG_NET_NS
2136 void sock_prot_inuse_add(struct net
*net
, struct proto
*prot
, int val
)
2138 int cpu
= smp_processor_id();
2139 per_cpu_ptr(net
->core
.inuse
, cpu
)->val
[prot
->inuse_idx
] += val
;
2141 EXPORT_SYMBOL_GPL(sock_prot_inuse_add
);
2143 int sock_prot_inuse_get(struct net
*net
, struct proto
*prot
)
2145 int cpu
, idx
= prot
->inuse_idx
;
2148 for_each_possible_cpu(cpu
)
2149 res
+= per_cpu_ptr(net
->core
.inuse
, cpu
)->val
[idx
];
2151 return res
>= 0 ? res
: 0;
2153 EXPORT_SYMBOL_GPL(sock_prot_inuse_get
);
2155 static int sock_inuse_init_net(struct net
*net
)
2157 net
->core
.inuse
= alloc_percpu(struct prot_inuse
);
2158 return net
->core
.inuse
? 0 : -ENOMEM
;
2161 static void sock_inuse_exit_net(struct net
*net
)
2163 free_percpu(net
->core
.inuse
);
2166 static struct pernet_operations net_inuse_ops
= {
2167 .init
= sock_inuse_init_net
,
2168 .exit
= sock_inuse_exit_net
,
2171 static __init
int net_inuse_init(void)
2173 if (register_pernet_subsys(&net_inuse_ops
))
2174 panic("Cannot initialize net inuse counters");
2179 core_initcall(net_inuse_init
);
2181 static DEFINE_PER_CPU(struct prot_inuse
, prot_inuse
);
2183 void sock_prot_inuse_add(struct net
*net
, struct proto
*prot
, int val
)
2185 __get_cpu_var(prot_inuse
).val
[prot
->inuse_idx
] += val
;
2187 EXPORT_SYMBOL_GPL(sock_prot_inuse_add
);
2189 int sock_prot_inuse_get(struct net
*net
, struct proto
*prot
)
2191 int cpu
, idx
= prot
->inuse_idx
;
2194 for_each_possible_cpu(cpu
)
2195 res
+= per_cpu(prot_inuse
, cpu
).val
[idx
];
2197 return res
>= 0 ? res
: 0;
2199 EXPORT_SYMBOL_GPL(sock_prot_inuse_get
);
2202 static void assign_proto_idx(struct proto
*prot
)
2204 prot
->inuse_idx
= find_first_zero_bit(proto_inuse_idx
, PROTO_INUSE_NR
);
2206 if (unlikely(prot
->inuse_idx
== PROTO_INUSE_NR
- 1)) {
2207 printk(KERN_ERR
"PROTO_INUSE_NR exhausted\n");
2211 set_bit(prot
->inuse_idx
, proto_inuse_idx
);
2214 static void release_proto_idx(struct proto
*prot
)
2216 if (prot
->inuse_idx
!= PROTO_INUSE_NR
- 1)
2217 clear_bit(prot
->inuse_idx
, proto_inuse_idx
);
2220 static inline void assign_proto_idx(struct proto
*prot
)
2224 static inline void release_proto_idx(struct proto
*prot
)
2229 int proto_register(struct proto
*prot
, int alloc_slab
)
2232 prot
->slab
= kmem_cache_create(prot
->name
, prot
->obj_size
, 0,
2233 SLAB_HWCACHE_ALIGN
| prot
->slab_flags
,
2236 if (prot
->slab
== NULL
) {
2237 printk(KERN_CRIT
"%s: Can't create sock SLAB cache!\n",
2242 if (prot
->rsk_prot
!= NULL
) {
2243 static const char mask
[] = "request_sock_%s";
2245 prot
->rsk_prot
->slab_name
= kmalloc(strlen(prot
->name
) + sizeof(mask
) - 1, GFP_KERNEL
);
2246 if (prot
->rsk_prot
->slab_name
== NULL
)
2247 goto out_free_sock_slab
;
2249 sprintf(prot
->rsk_prot
->slab_name
, mask
, prot
->name
);
2250 prot
->rsk_prot
->slab
= kmem_cache_create(prot
->rsk_prot
->slab_name
,
2251 prot
->rsk_prot
->obj_size
, 0,
2252 SLAB_HWCACHE_ALIGN
, NULL
);
2254 if (prot
->rsk_prot
->slab
== NULL
) {
2255 printk(KERN_CRIT
"%s: Can't create request sock SLAB cache!\n",
2257 goto out_free_request_sock_slab_name
;
2261 if (prot
->twsk_prot
!= NULL
) {
2262 static const char mask
[] = "tw_sock_%s";
2264 prot
->twsk_prot
->twsk_slab_name
= kmalloc(strlen(prot
->name
) + sizeof(mask
) - 1, GFP_KERNEL
);
2266 if (prot
->twsk_prot
->twsk_slab_name
== NULL
)
2267 goto out_free_request_sock_slab
;
2269 sprintf(prot
->twsk_prot
->twsk_slab_name
, mask
, prot
->name
);
2270 prot
->twsk_prot
->twsk_slab
=
2271 kmem_cache_create(prot
->twsk_prot
->twsk_slab_name
,
2272 prot
->twsk_prot
->twsk_obj_size
,
2274 SLAB_HWCACHE_ALIGN
|
2277 if (prot
->twsk_prot
->twsk_slab
== NULL
)
2278 goto out_free_timewait_sock_slab_name
;
2282 write_lock(&proto_list_lock
);
2283 list_add(&prot
->node
, &proto_list
);
2284 assign_proto_idx(prot
);
2285 write_unlock(&proto_list_lock
);
2288 out_free_timewait_sock_slab_name
:
2289 kfree(prot
->twsk_prot
->twsk_slab_name
);
2290 out_free_request_sock_slab
:
2291 if (prot
->rsk_prot
&& prot
->rsk_prot
->slab
) {
2292 kmem_cache_destroy(prot
->rsk_prot
->slab
);
2293 prot
->rsk_prot
->slab
= NULL
;
2295 out_free_request_sock_slab_name
:
2296 kfree(prot
->rsk_prot
->slab_name
);
2298 kmem_cache_destroy(prot
->slab
);
2303 EXPORT_SYMBOL(proto_register
);
2305 void proto_unregister(struct proto
*prot
)
2307 write_lock(&proto_list_lock
);
2308 release_proto_idx(prot
);
2309 list_del(&prot
->node
);
2310 write_unlock(&proto_list_lock
);
2312 if (prot
->slab
!= NULL
) {
2313 kmem_cache_destroy(prot
->slab
);
2317 if (prot
->rsk_prot
!= NULL
&& prot
->rsk_prot
->slab
!= NULL
) {
2318 kmem_cache_destroy(prot
->rsk_prot
->slab
);
2319 kfree(prot
->rsk_prot
->slab_name
);
2320 prot
->rsk_prot
->slab
= NULL
;
2323 if (prot
->twsk_prot
!= NULL
&& prot
->twsk_prot
->twsk_slab
!= NULL
) {
2324 kmem_cache_destroy(prot
->twsk_prot
->twsk_slab
);
2325 kfree(prot
->twsk_prot
->twsk_slab_name
);
2326 prot
->twsk_prot
->twsk_slab
= NULL
;
2329 EXPORT_SYMBOL(proto_unregister
);
2331 #ifdef CONFIG_PROC_FS
2332 static void *proto_seq_start(struct seq_file
*seq
, loff_t
*pos
)
2333 __acquires(proto_list_lock
)
2335 read_lock(&proto_list_lock
);
2336 return seq_list_start_head(&proto_list
, *pos
);
2339 static void *proto_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
2341 return seq_list_next(v
, &proto_list
, pos
);
2344 static void proto_seq_stop(struct seq_file
*seq
, void *v
)
2345 __releases(proto_list_lock
)
2347 read_unlock(&proto_list_lock
);
2350 static char proto_method_implemented(const void *method
)
2352 return method
== NULL
? 'n' : 'y';
2355 static void proto_seq_printf(struct seq_file
*seq
, struct proto
*proto
)
2357 seq_printf(seq
, "%-9s %4u %6d %6d %-3s %6u %-3s %-10s "
2358 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
2361 sock_prot_inuse_get(seq_file_net(seq
), proto
),
2362 proto
->memory_allocated
!= NULL
? atomic_read(proto
->memory_allocated
) : -1,
2363 proto
->memory_pressure
!= NULL
? *proto
->memory_pressure
? "yes" : "no" : "NI",
2365 proto
->slab
== NULL
? "no" : "yes",
2366 module_name(proto
->owner
),
2367 proto_method_implemented(proto
->close
),
2368 proto_method_implemented(proto
->connect
),
2369 proto_method_implemented(proto
->disconnect
),
2370 proto_method_implemented(proto
->accept
),
2371 proto_method_implemented(proto
->ioctl
),
2372 proto_method_implemented(proto
->init
),
2373 proto_method_implemented(proto
->destroy
),
2374 proto_method_implemented(proto
->shutdown
),
2375 proto_method_implemented(proto
->setsockopt
),
2376 proto_method_implemented(proto
->getsockopt
),
2377 proto_method_implemented(proto
->sendmsg
),
2378 proto_method_implemented(proto
->recvmsg
),
2379 proto_method_implemented(proto
->sendpage
),
2380 proto_method_implemented(proto
->bind
),
2381 proto_method_implemented(proto
->backlog_rcv
),
2382 proto_method_implemented(proto
->hash
),
2383 proto_method_implemented(proto
->unhash
),
2384 proto_method_implemented(proto
->get_port
),
2385 proto_method_implemented(proto
->enter_memory_pressure
));
2388 static int proto_seq_show(struct seq_file
*seq
, void *v
)
2390 if (v
== &proto_list
)
2391 seq_printf(seq
, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
2400 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
2402 proto_seq_printf(seq
, list_entry(v
, struct proto
, node
));
2406 static const struct seq_operations proto_seq_ops
= {
2407 .start
= proto_seq_start
,
2408 .next
= proto_seq_next
,
2409 .stop
= proto_seq_stop
,
2410 .show
= proto_seq_show
,
2413 static int proto_seq_open(struct inode
*inode
, struct file
*file
)
2415 return seq_open_net(inode
, file
, &proto_seq_ops
,
2416 sizeof(struct seq_net_private
));
2419 static const struct file_operations proto_seq_fops
= {
2420 .owner
= THIS_MODULE
,
2421 .open
= proto_seq_open
,
2423 .llseek
= seq_lseek
,
2424 .release
= seq_release_net
,
2427 static __net_init
int proto_init_net(struct net
*net
)
2429 if (!proc_net_fops_create(net
, "protocols", S_IRUGO
, &proto_seq_fops
))
2435 static __net_exit
void proto_exit_net(struct net
*net
)
2437 proc_net_remove(net
, "protocols");
2441 static __net_initdata
struct pernet_operations proto_net_ops
= {
2442 .init
= proto_init_net
,
2443 .exit
= proto_exit_net
,
2446 static int __init
proto_init(void)
2448 return register_pernet_subsys(&proto_net_ops
);
2451 subsys_initcall(proto_init
);
2453 #endif /* PROC_FS */