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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
94 #include <linux/capability.h>
95 #include <linux/errno.h>
96 #include <linux/errqueue.h>
97 #include <linux/types.h>
98 #include <linux/socket.h>
100 #include <linux/kernel.h>
101 #include <linux/module.h>
102 #include <linux/proc_fs.h>
103 #include <linux/seq_file.h>
104 #include <linux/sched.h>
105 #include <linux/sched/mm.h>
106 #include <linux/timer.h>
107 #include <linux/string.h>
108 #include <linux/sockios.h>
109 #include <linux/net.h>
110 #include <linux/mm.h>
111 #include <linux/slab.h>
112 #include <linux/interrupt.h>
113 #include <linux/poll.h>
114 #include <linux/tcp.h>
115 #include <linux/init.h>
116 #include <linux/highmem.h>
117 #include <linux/user_namespace.h>
118 #include <linux/static_key.h>
119 #include <linux/memcontrol.h>
120 #include <linux/prefetch.h>
122 #include <linux/uaccess.h>
124 #include <linux/netdevice.h>
125 #include <net/protocol.h>
126 #include <linux/skbuff.h>
127 #include <net/net_namespace.h>
128 #include <net/request_sock.h>
129 #include <net/sock.h>
130 #include <linux/net_tstamp.h>
131 #include <net/xfrm.h>
132 #include <linux/ipsec.h>
133 #include <net/cls_cgroup.h>
134 #include <net/netprio_cgroup.h>
135 #include <linux/sock_diag.h>
137 #include <linux/filter.h>
138 #include <net/sock_reuseport.h>
140 #include <trace/events/sock.h>
143 #include <net/busy_poll.h>
145 static DEFINE_MUTEX(proto_list_mutex
);
146 static LIST_HEAD(proto_list
);
149 * sk_ns_capable - General socket capability test
150 * @sk: Socket to use a capability on or through
151 * @user_ns: The user namespace of the capability to use
152 * @cap: The capability to use
154 * Test to see if the opener of the socket had when the socket was
155 * created and the current process has the capability @cap in the user
156 * namespace @user_ns.
158 bool sk_ns_capable(const struct sock
*sk
,
159 struct user_namespace
*user_ns
, int cap
)
161 return file_ns_capable(sk
->sk_socket
->file
, user_ns
, cap
) &&
162 ns_capable(user_ns
, cap
);
164 EXPORT_SYMBOL(sk_ns_capable
);
167 * sk_capable - Socket global capability test
168 * @sk: Socket to use a capability on or through
169 * @cap: The global capability to use
171 * Test to see if the opener of the socket had when the socket was
172 * created and the current process has the capability @cap in all user
175 bool sk_capable(const struct sock
*sk
, int cap
)
177 return sk_ns_capable(sk
, &init_user_ns
, cap
);
179 EXPORT_SYMBOL(sk_capable
);
182 * sk_net_capable - Network namespace socket capability test
183 * @sk: Socket to use a capability on or through
184 * @cap: The capability to use
186 * Test to see if the opener of the socket had when the socket was created
187 * and the current process has the capability @cap over the network namespace
188 * the socket is a member of.
190 bool sk_net_capable(const struct sock
*sk
, int cap
)
192 return sk_ns_capable(sk
, sock_net(sk
)->user_ns
, cap
);
194 EXPORT_SYMBOL(sk_net_capable
);
197 * Each address family might have different locking rules, so we have
198 * one slock key per address family and separate keys for internal and
201 static struct lock_class_key af_family_keys
[AF_MAX
];
202 static struct lock_class_key af_family_kern_keys
[AF_MAX
];
203 static struct lock_class_key af_family_slock_keys
[AF_MAX
];
204 static struct lock_class_key af_family_kern_slock_keys
[AF_MAX
];
207 * Make lock validator output more readable. (we pre-construct these
208 * strings build-time, so that runtime initialization of socket
212 #define _sock_locks(x) \
213 x "AF_UNSPEC", x "AF_UNIX" , x "AF_INET" , \
214 x "AF_AX25" , x "AF_IPX" , x "AF_APPLETALK", \
215 x "AF_NETROM", x "AF_BRIDGE" , x "AF_ATMPVC" , \
216 x "AF_X25" , x "AF_INET6" , x "AF_ROSE" , \
217 x "AF_DECnet", x "AF_NETBEUI" , x "AF_SECURITY" , \
218 x "AF_KEY" , x "AF_NETLINK" , x "AF_PACKET" , \
219 x "AF_ASH" , x "AF_ECONET" , x "AF_ATMSVC" , \
220 x "AF_RDS" , x "AF_SNA" , x "AF_IRDA" , \
221 x "AF_PPPOX" , x "AF_WANPIPE" , x "AF_LLC" , \
222 x "27" , x "28" , x "AF_CAN" , \
223 x "AF_TIPC" , x "AF_BLUETOOTH", x "IUCV" , \
224 x "AF_RXRPC" , x "AF_ISDN" , x "AF_PHONET" , \
225 x "AF_IEEE802154", x "AF_CAIF" , x "AF_ALG" , \
226 x "AF_NFC" , x "AF_VSOCK" , x "AF_KCM" , \
227 x "AF_QIPCRTR", x "AF_SMC" , x "AF_MAX"
229 static const char *const af_family_key_strings
[AF_MAX
+1] = {
230 _sock_locks("sk_lock-")
232 static const char *const af_family_slock_key_strings
[AF_MAX
+1] = {
233 _sock_locks("slock-")
235 static const char *const af_family_clock_key_strings
[AF_MAX
+1] = {
236 _sock_locks("clock-")
239 static const char *const af_family_kern_key_strings
[AF_MAX
+1] = {
240 _sock_locks("k-sk_lock-")
242 static const char *const af_family_kern_slock_key_strings
[AF_MAX
+1] = {
243 _sock_locks("k-slock-")
245 static const char *const af_family_kern_clock_key_strings
[AF_MAX
+1] = {
246 _sock_locks("k-clock-")
248 static const char *const af_family_rlock_key_strings
[AF_MAX
+1] = {
249 "rlock-AF_UNSPEC", "rlock-AF_UNIX" , "rlock-AF_INET" ,
250 "rlock-AF_AX25" , "rlock-AF_IPX" , "rlock-AF_APPLETALK",
251 "rlock-AF_NETROM", "rlock-AF_BRIDGE" , "rlock-AF_ATMPVC" ,
252 "rlock-AF_X25" , "rlock-AF_INET6" , "rlock-AF_ROSE" ,
253 "rlock-AF_DECnet", "rlock-AF_NETBEUI" , "rlock-AF_SECURITY" ,
254 "rlock-AF_KEY" , "rlock-AF_NETLINK" , "rlock-AF_PACKET" ,
255 "rlock-AF_ASH" , "rlock-AF_ECONET" , "rlock-AF_ATMSVC" ,
256 "rlock-AF_RDS" , "rlock-AF_SNA" , "rlock-AF_IRDA" ,
257 "rlock-AF_PPPOX" , "rlock-AF_WANPIPE" , "rlock-AF_LLC" ,
258 "rlock-27" , "rlock-28" , "rlock-AF_CAN" ,
259 "rlock-AF_TIPC" , "rlock-AF_BLUETOOTH", "rlock-AF_IUCV" ,
260 "rlock-AF_RXRPC" , "rlock-AF_ISDN" , "rlock-AF_PHONET" ,
261 "rlock-AF_IEEE802154", "rlock-AF_CAIF" , "rlock-AF_ALG" ,
262 "rlock-AF_NFC" , "rlock-AF_VSOCK" , "rlock-AF_KCM" ,
263 "rlock-AF_QIPCRTR", "rlock-AF_SMC" , "rlock-AF_MAX"
265 static const char *const af_family_wlock_key_strings
[AF_MAX
+1] = {
266 "wlock-AF_UNSPEC", "wlock-AF_UNIX" , "wlock-AF_INET" ,
267 "wlock-AF_AX25" , "wlock-AF_IPX" , "wlock-AF_APPLETALK",
268 "wlock-AF_NETROM", "wlock-AF_BRIDGE" , "wlock-AF_ATMPVC" ,
269 "wlock-AF_X25" , "wlock-AF_INET6" , "wlock-AF_ROSE" ,
270 "wlock-AF_DECnet", "wlock-AF_NETBEUI" , "wlock-AF_SECURITY" ,
271 "wlock-AF_KEY" , "wlock-AF_NETLINK" , "wlock-AF_PACKET" ,
272 "wlock-AF_ASH" , "wlock-AF_ECONET" , "wlock-AF_ATMSVC" ,
273 "wlock-AF_RDS" , "wlock-AF_SNA" , "wlock-AF_IRDA" ,
274 "wlock-AF_PPPOX" , "wlock-AF_WANPIPE" , "wlock-AF_LLC" ,
275 "wlock-27" , "wlock-28" , "wlock-AF_CAN" ,
276 "wlock-AF_TIPC" , "wlock-AF_BLUETOOTH", "wlock-AF_IUCV" ,
277 "wlock-AF_RXRPC" , "wlock-AF_ISDN" , "wlock-AF_PHONET" ,
278 "wlock-AF_IEEE802154", "wlock-AF_CAIF" , "wlock-AF_ALG" ,
279 "wlock-AF_NFC" , "wlock-AF_VSOCK" , "wlock-AF_KCM" ,
280 "wlock-AF_QIPCRTR", "wlock-AF_SMC" , "wlock-AF_MAX"
282 static const char *const af_family_elock_key_strings
[AF_MAX
+1] = {
283 "elock-AF_UNSPEC", "elock-AF_UNIX" , "elock-AF_INET" ,
284 "elock-AF_AX25" , "elock-AF_IPX" , "elock-AF_APPLETALK",
285 "elock-AF_NETROM", "elock-AF_BRIDGE" , "elock-AF_ATMPVC" ,
286 "elock-AF_X25" , "elock-AF_INET6" , "elock-AF_ROSE" ,
287 "elock-AF_DECnet", "elock-AF_NETBEUI" , "elock-AF_SECURITY" ,
288 "elock-AF_KEY" , "elock-AF_NETLINK" , "elock-AF_PACKET" ,
289 "elock-AF_ASH" , "elock-AF_ECONET" , "elock-AF_ATMSVC" ,
290 "elock-AF_RDS" , "elock-AF_SNA" , "elock-AF_IRDA" ,
291 "elock-AF_PPPOX" , "elock-AF_WANPIPE" , "elock-AF_LLC" ,
292 "elock-27" , "elock-28" , "elock-AF_CAN" ,
293 "elock-AF_TIPC" , "elock-AF_BLUETOOTH", "elock-AF_IUCV" ,
294 "elock-AF_RXRPC" , "elock-AF_ISDN" , "elock-AF_PHONET" ,
295 "elock-AF_IEEE802154", "elock-AF_CAIF" , "elock-AF_ALG" ,
296 "elock-AF_NFC" , "elock-AF_VSOCK" , "elock-AF_KCM" ,
297 "elock-AF_QIPCRTR", "elock-AF_SMC" , "elock-AF_MAX"
301 * sk_callback_lock and sk queues locking rules are per-address-family,
302 * so split the lock classes by using a per-AF key:
304 static struct lock_class_key af_callback_keys
[AF_MAX
];
305 static struct lock_class_key af_rlock_keys
[AF_MAX
];
306 static struct lock_class_key af_wlock_keys
[AF_MAX
];
307 static struct lock_class_key af_elock_keys
[AF_MAX
];
308 static struct lock_class_key af_kern_callback_keys
[AF_MAX
];
310 /* Take into consideration the size of the struct sk_buff overhead in the
311 * determination of these values, since that is non-constant across
312 * platforms. This makes socket queueing behavior and performance
313 * not depend upon such differences.
315 #define _SK_MEM_PACKETS 256
316 #define _SK_MEM_OVERHEAD SKB_TRUESIZE(256)
317 #define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
318 #define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
320 /* Run time adjustable parameters. */
321 __u32 sysctl_wmem_max __read_mostly
= SK_WMEM_MAX
;
322 EXPORT_SYMBOL(sysctl_wmem_max
);
323 __u32 sysctl_rmem_max __read_mostly
= SK_RMEM_MAX
;
324 EXPORT_SYMBOL(sysctl_rmem_max
);
325 __u32 sysctl_wmem_default __read_mostly
= SK_WMEM_MAX
;
326 __u32 sysctl_rmem_default __read_mostly
= SK_RMEM_MAX
;
328 /* Maximal space eaten by iovec or ancillary data plus some space */
329 int sysctl_optmem_max __read_mostly
= sizeof(unsigned long)*(2*UIO_MAXIOV
+512);
330 EXPORT_SYMBOL(sysctl_optmem_max
);
332 int sysctl_tstamp_allow_data __read_mostly
= 1;
334 struct static_key memalloc_socks
= STATIC_KEY_INIT_FALSE
;
335 EXPORT_SYMBOL_GPL(memalloc_socks
);
338 * sk_set_memalloc - sets %SOCK_MEMALLOC
339 * @sk: socket to set it on
341 * Set %SOCK_MEMALLOC on a socket for access to emergency reserves.
342 * It's the responsibility of the admin to adjust min_free_kbytes
343 * to meet the requirements
345 void sk_set_memalloc(struct sock
*sk
)
347 sock_set_flag(sk
, SOCK_MEMALLOC
);
348 sk
->sk_allocation
|= __GFP_MEMALLOC
;
349 static_key_slow_inc(&memalloc_socks
);
351 EXPORT_SYMBOL_GPL(sk_set_memalloc
);
353 void sk_clear_memalloc(struct sock
*sk
)
355 sock_reset_flag(sk
, SOCK_MEMALLOC
);
356 sk
->sk_allocation
&= ~__GFP_MEMALLOC
;
357 static_key_slow_dec(&memalloc_socks
);
360 * SOCK_MEMALLOC is allowed to ignore rmem limits to ensure forward
361 * progress of swapping. SOCK_MEMALLOC may be cleared while
362 * it has rmem allocations due to the last swapfile being deactivated
363 * but there is a risk that the socket is unusable due to exceeding
364 * the rmem limits. Reclaim the reserves and obey rmem limits again.
368 EXPORT_SYMBOL_GPL(sk_clear_memalloc
);
370 int __sk_backlog_rcv(struct sock
*sk
, struct sk_buff
*skb
)
373 unsigned int noreclaim_flag
;
375 /* these should have been dropped before queueing */
376 BUG_ON(!sock_flag(sk
, SOCK_MEMALLOC
));
378 noreclaim_flag
= memalloc_noreclaim_save();
379 ret
= sk
->sk_backlog_rcv(sk
, skb
);
380 memalloc_noreclaim_restore(noreclaim_flag
);
384 EXPORT_SYMBOL(__sk_backlog_rcv
);
386 static int sock_set_timeout(long *timeo_p
, char __user
*optval
, int optlen
)
390 if (optlen
< sizeof(tv
))
392 if (copy_from_user(&tv
, optval
, sizeof(tv
)))
394 if (tv
.tv_usec
< 0 || tv
.tv_usec
>= USEC_PER_SEC
)
398 static int warned __read_mostly
;
401 if (warned
< 10 && net_ratelimit()) {
403 pr_info("%s: `%s' (pid %d) tries to set negative timeout\n",
404 __func__
, current
->comm
, task_pid_nr(current
));
408 *timeo_p
= MAX_SCHEDULE_TIMEOUT
;
409 if (tv
.tv_sec
== 0 && tv
.tv_usec
== 0)
411 if (tv
.tv_sec
< (MAX_SCHEDULE_TIMEOUT
/HZ
- 1))
412 *timeo_p
= tv
.tv_sec
* HZ
+ DIV_ROUND_UP(tv
.tv_usec
, USEC_PER_SEC
/ HZ
);
416 static void sock_warn_obsolete_bsdism(const char *name
)
419 static char warncomm
[TASK_COMM_LEN
];
420 if (strcmp(warncomm
, current
->comm
) && warned
< 5) {
421 strcpy(warncomm
, current
->comm
);
422 pr_warn("process `%s' is using obsolete %s SO_BSDCOMPAT\n",
428 static bool sock_needs_netstamp(const struct sock
*sk
)
430 switch (sk
->sk_family
) {
439 static void sock_disable_timestamp(struct sock
*sk
, unsigned long flags
)
441 if (sk
->sk_flags
& flags
) {
442 sk
->sk_flags
&= ~flags
;
443 if (sock_needs_netstamp(sk
) &&
444 !(sk
->sk_flags
& SK_FLAGS_TIMESTAMP
))
445 net_disable_timestamp();
450 int __sock_queue_rcv_skb(struct sock
*sk
, struct sk_buff
*skb
)
453 struct sk_buff_head
*list
= &sk
->sk_receive_queue
;
455 if (atomic_read(&sk
->sk_rmem_alloc
) >= sk
->sk_rcvbuf
) {
456 atomic_inc(&sk
->sk_drops
);
457 trace_sock_rcvqueue_full(sk
, skb
);
461 if (!sk_rmem_schedule(sk
, skb
, skb
->truesize
)) {
462 atomic_inc(&sk
->sk_drops
);
467 skb_set_owner_r(skb
, sk
);
469 /* we escape from rcu protected region, make sure we dont leak
474 spin_lock_irqsave(&list
->lock
, flags
);
475 sock_skb_set_dropcount(sk
, skb
);
476 __skb_queue_tail(list
, skb
);
477 spin_unlock_irqrestore(&list
->lock
, flags
);
479 if (!sock_flag(sk
, SOCK_DEAD
))
480 sk
->sk_data_ready(sk
);
483 EXPORT_SYMBOL(__sock_queue_rcv_skb
);
485 int sock_queue_rcv_skb(struct sock
*sk
, struct sk_buff
*skb
)
489 err
= sk_filter(sk
, skb
);
493 return __sock_queue_rcv_skb(sk
, skb
);
495 EXPORT_SYMBOL(sock_queue_rcv_skb
);
497 int __sk_receive_skb(struct sock
*sk
, struct sk_buff
*skb
,
498 const int nested
, unsigned int trim_cap
, bool refcounted
)
500 int rc
= NET_RX_SUCCESS
;
502 if (sk_filter_trim_cap(sk
, skb
, trim_cap
))
503 goto discard_and_relse
;
507 if (sk_rcvqueues_full(sk
, sk
->sk_rcvbuf
)) {
508 atomic_inc(&sk
->sk_drops
);
509 goto discard_and_relse
;
512 bh_lock_sock_nested(sk
);
515 if (!sock_owned_by_user(sk
)) {
517 * trylock + unlock semantics:
519 mutex_acquire(&sk
->sk_lock
.dep_map
, 0, 1, _RET_IP_
);
521 rc
= sk_backlog_rcv(sk
, skb
);
523 mutex_release(&sk
->sk_lock
.dep_map
, 1, _RET_IP_
);
524 } else if (sk_add_backlog(sk
, skb
, sk
->sk_rcvbuf
)) {
526 atomic_inc(&sk
->sk_drops
);
527 goto discard_and_relse
;
539 EXPORT_SYMBOL(__sk_receive_skb
);
541 struct dst_entry
*__sk_dst_check(struct sock
*sk
, u32 cookie
)
543 struct dst_entry
*dst
= __sk_dst_get(sk
);
545 if (dst
&& dst
->obsolete
&& dst
->ops
->check(dst
, cookie
) == NULL
) {
546 sk_tx_queue_clear(sk
);
547 sk
->sk_dst_pending_confirm
= 0;
548 RCU_INIT_POINTER(sk
->sk_dst_cache
, NULL
);
555 EXPORT_SYMBOL(__sk_dst_check
);
557 struct dst_entry
*sk_dst_check(struct sock
*sk
, u32 cookie
)
559 struct dst_entry
*dst
= sk_dst_get(sk
);
561 if (dst
&& dst
->obsolete
&& dst
->ops
->check(dst
, cookie
) == NULL
) {
569 EXPORT_SYMBOL(sk_dst_check
);
571 static int sock_setbindtodevice(struct sock
*sk
, char __user
*optval
,
574 int ret
= -ENOPROTOOPT
;
575 #ifdef CONFIG_NETDEVICES
576 struct net
*net
= sock_net(sk
);
577 char devname
[IFNAMSIZ
];
582 if (!ns_capable(net
->user_ns
, CAP_NET_RAW
))
589 /* Bind this socket to a particular device like "eth0",
590 * as specified in the passed interface name. If the
591 * name is "" or the option length is zero the socket
594 if (optlen
> IFNAMSIZ
- 1)
595 optlen
= IFNAMSIZ
- 1;
596 memset(devname
, 0, sizeof(devname
));
599 if (copy_from_user(devname
, optval
, optlen
))
603 if (devname
[0] != '\0') {
604 struct net_device
*dev
;
607 dev
= dev_get_by_name_rcu(net
, devname
);
609 index
= dev
->ifindex
;
617 sk
->sk_bound_dev_if
= index
;
629 static int sock_getbindtodevice(struct sock
*sk
, char __user
*optval
,
630 int __user
*optlen
, int len
)
632 int ret
= -ENOPROTOOPT
;
633 #ifdef CONFIG_NETDEVICES
634 struct net
*net
= sock_net(sk
);
635 char devname
[IFNAMSIZ
];
637 if (sk
->sk_bound_dev_if
== 0) {
646 ret
= netdev_get_name(net
, devname
, sk
->sk_bound_dev_if
);
650 len
= strlen(devname
) + 1;
653 if (copy_to_user(optval
, devname
, len
))
658 if (put_user(len
, optlen
))
669 static inline void sock_valbool_flag(struct sock
*sk
, int bit
, int valbool
)
672 sock_set_flag(sk
, bit
);
674 sock_reset_flag(sk
, bit
);
677 bool sk_mc_loop(struct sock
*sk
)
679 if (dev_recursion_level())
683 switch (sk
->sk_family
) {
685 return inet_sk(sk
)->mc_loop
;
686 #if IS_ENABLED(CONFIG_IPV6)
688 return inet6_sk(sk
)->mc_loop
;
694 EXPORT_SYMBOL(sk_mc_loop
);
697 * This is meant for all protocols to use and covers goings on
698 * at the socket level. Everything here is generic.
701 int sock_setsockopt(struct socket
*sock
, int level
, int optname
,
702 char __user
*optval
, unsigned int optlen
)
704 struct sock
*sk
= sock
->sk
;
711 * Options without arguments
714 if (optname
== SO_BINDTODEVICE
)
715 return sock_setbindtodevice(sk
, optval
, optlen
);
717 if (optlen
< sizeof(int))
720 if (get_user(val
, (int __user
*)optval
))
723 valbool
= val
? 1 : 0;
729 if (val
&& !capable(CAP_NET_ADMIN
))
732 sock_valbool_flag(sk
, SOCK_DBG
, valbool
);
735 sk
->sk_reuse
= (valbool
? SK_CAN_REUSE
: SK_NO_REUSE
);
738 sk
->sk_reuseport
= valbool
;
747 sock_valbool_flag(sk
, SOCK_LOCALROUTE
, valbool
);
750 sock_valbool_flag(sk
, SOCK_BROADCAST
, valbool
);
753 /* Don't error on this BSD doesn't and if you think
754 * about it this is right. Otherwise apps have to
755 * play 'guess the biggest size' games. RCVBUF/SNDBUF
756 * are treated in BSD as hints
758 val
= min_t(u32
, val
, sysctl_wmem_max
);
760 sk
->sk_userlocks
|= SOCK_SNDBUF_LOCK
;
761 sk
->sk_sndbuf
= max_t(int, val
* 2, SOCK_MIN_SNDBUF
);
762 /* Wake up sending tasks if we upped the value. */
763 sk
->sk_write_space(sk
);
767 if (!capable(CAP_NET_ADMIN
)) {
774 /* Don't error on this BSD doesn't and if you think
775 * about it this is right. Otherwise apps have to
776 * play 'guess the biggest size' games. RCVBUF/SNDBUF
777 * are treated in BSD as hints
779 val
= min_t(u32
, val
, sysctl_rmem_max
);
781 sk
->sk_userlocks
|= SOCK_RCVBUF_LOCK
;
783 * We double it on the way in to account for
784 * "struct sk_buff" etc. overhead. Applications
785 * assume that the SO_RCVBUF setting they make will
786 * allow that much actual data to be received on that
789 * Applications are unaware that "struct sk_buff" and
790 * other overheads allocate from the receive buffer
791 * during socket buffer allocation.
793 * And after considering the possible alternatives,
794 * returning the value we actually used in getsockopt
795 * is the most desirable behavior.
797 sk
->sk_rcvbuf
= max_t(int, val
* 2, SOCK_MIN_RCVBUF
);
801 if (!capable(CAP_NET_ADMIN
)) {
808 if (sk
->sk_prot
->keepalive
)
809 sk
->sk_prot
->keepalive(sk
, valbool
);
810 sock_valbool_flag(sk
, SOCK_KEEPOPEN
, valbool
);
814 sock_valbool_flag(sk
, SOCK_URGINLINE
, valbool
);
818 sk
->sk_no_check_tx
= valbool
;
822 if ((val
>= 0 && val
<= 6) ||
823 ns_capable(sock_net(sk
)->user_ns
, CAP_NET_ADMIN
))
824 sk
->sk_priority
= val
;
830 if (optlen
< sizeof(ling
)) {
831 ret
= -EINVAL
; /* 1003.1g */
834 if (copy_from_user(&ling
, optval
, sizeof(ling
))) {
839 sock_reset_flag(sk
, SOCK_LINGER
);
841 #if (BITS_PER_LONG == 32)
842 if ((unsigned int)ling
.l_linger
>= MAX_SCHEDULE_TIMEOUT
/HZ
)
843 sk
->sk_lingertime
= MAX_SCHEDULE_TIMEOUT
;
846 sk
->sk_lingertime
= (unsigned int)ling
.l_linger
* HZ
;
847 sock_set_flag(sk
, SOCK_LINGER
);
852 sock_warn_obsolete_bsdism("setsockopt");
857 set_bit(SOCK_PASSCRED
, &sock
->flags
);
859 clear_bit(SOCK_PASSCRED
, &sock
->flags
);
865 if (optname
== SO_TIMESTAMP
)
866 sock_reset_flag(sk
, SOCK_RCVTSTAMPNS
);
868 sock_set_flag(sk
, SOCK_RCVTSTAMPNS
);
869 sock_set_flag(sk
, SOCK_RCVTSTAMP
);
870 sock_enable_timestamp(sk
, SOCK_TIMESTAMP
);
872 sock_reset_flag(sk
, SOCK_RCVTSTAMP
);
873 sock_reset_flag(sk
, SOCK_RCVTSTAMPNS
);
877 case SO_TIMESTAMPING
:
878 if (val
& ~SOF_TIMESTAMPING_MASK
) {
883 if (val
& SOF_TIMESTAMPING_OPT_ID
&&
884 !(sk
->sk_tsflags
& SOF_TIMESTAMPING_OPT_ID
)) {
885 if (sk
->sk_protocol
== IPPROTO_TCP
&&
886 sk
->sk_type
== SOCK_STREAM
) {
887 if ((1 << sk
->sk_state
) &
888 (TCPF_CLOSE
| TCPF_LISTEN
)) {
892 sk
->sk_tskey
= tcp_sk(sk
)->snd_una
;
898 if (val
& SOF_TIMESTAMPING_OPT_STATS
&&
899 !(val
& SOF_TIMESTAMPING_OPT_TSONLY
)) {
904 sk
->sk_tsflags
= val
;
905 if (val
& SOF_TIMESTAMPING_RX_SOFTWARE
)
906 sock_enable_timestamp(sk
,
907 SOCK_TIMESTAMPING_RX_SOFTWARE
);
909 sock_disable_timestamp(sk
,
910 (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE
));
916 sk
->sk_rcvlowat
= val
? : 1;
920 ret
= sock_set_timeout(&sk
->sk_rcvtimeo
, optval
, optlen
);
924 ret
= sock_set_timeout(&sk
->sk_sndtimeo
, optval
, optlen
);
927 case SO_ATTACH_FILTER
:
929 if (optlen
== sizeof(struct sock_fprog
)) {
930 struct sock_fprog fprog
;
933 if (copy_from_user(&fprog
, optval
, sizeof(fprog
)))
936 ret
= sk_attach_filter(&fprog
, sk
);
942 if (optlen
== sizeof(u32
)) {
946 if (copy_from_user(&ufd
, optval
, sizeof(ufd
)))
949 ret
= sk_attach_bpf(ufd
, sk
);
953 case SO_ATTACH_REUSEPORT_CBPF
:
955 if (optlen
== sizeof(struct sock_fprog
)) {
956 struct sock_fprog fprog
;
959 if (copy_from_user(&fprog
, optval
, sizeof(fprog
)))
962 ret
= sk_reuseport_attach_filter(&fprog
, sk
);
966 case SO_ATTACH_REUSEPORT_EBPF
:
968 if (optlen
== sizeof(u32
)) {
972 if (copy_from_user(&ufd
, optval
, sizeof(ufd
)))
975 ret
= sk_reuseport_attach_bpf(ufd
, sk
);
979 case SO_DETACH_FILTER
:
980 ret
= sk_detach_filter(sk
);
984 if (sock_flag(sk
, SOCK_FILTER_LOCKED
) && !valbool
)
987 sock_valbool_flag(sk
, SOCK_FILTER_LOCKED
, valbool
);
992 set_bit(SOCK_PASSSEC
, &sock
->flags
);
994 clear_bit(SOCK_PASSSEC
, &sock
->flags
);
997 if (!ns_capable(sock_net(sk
)->user_ns
, CAP_NET_ADMIN
))
1004 sock_valbool_flag(sk
, SOCK_RXQ_OVFL
, valbool
);
1007 case SO_WIFI_STATUS
:
1008 sock_valbool_flag(sk
, SOCK_WIFI_STATUS
, valbool
);
1012 if (sock
->ops
->set_peek_off
)
1013 ret
= sock
->ops
->set_peek_off(sk
, val
);
1019 sock_valbool_flag(sk
, SOCK_NOFCS
, valbool
);
1022 case SO_SELECT_ERR_QUEUE
:
1023 sock_valbool_flag(sk
, SOCK_SELECT_ERR_QUEUE
, valbool
);
1026 #ifdef CONFIG_NET_RX_BUSY_POLL
1028 /* allow unprivileged users to decrease the value */
1029 if ((val
> sk
->sk_ll_usec
) && !capable(CAP_NET_ADMIN
))
1035 sk
->sk_ll_usec
= val
;
1040 case SO_MAX_PACING_RATE
:
1041 sk
->sk_max_pacing_rate
= val
;
1042 sk
->sk_pacing_rate
= min(sk
->sk_pacing_rate
,
1043 sk
->sk_max_pacing_rate
);
1046 case SO_INCOMING_CPU
:
1047 sk
->sk_incoming_cpu
= val
;
1052 dst_negative_advice(sk
);
1061 EXPORT_SYMBOL(sock_setsockopt
);
1064 static void cred_to_ucred(struct pid
*pid
, const struct cred
*cred
,
1065 struct ucred
*ucred
)
1067 ucred
->pid
= pid_vnr(pid
);
1068 ucred
->uid
= ucred
->gid
= -1;
1070 struct user_namespace
*current_ns
= current_user_ns();
1072 ucred
->uid
= from_kuid_munged(current_ns
, cred
->euid
);
1073 ucred
->gid
= from_kgid_munged(current_ns
, cred
->egid
);
1077 int sock_getsockopt(struct socket
*sock
, int level
, int optname
,
1078 char __user
*optval
, int __user
*optlen
)
1080 struct sock
*sk
= sock
->sk
;
1089 int lv
= sizeof(int);
1092 if (get_user(len
, optlen
))
1097 memset(&v
, 0, sizeof(v
));
1101 v
.val
= sock_flag(sk
, SOCK_DBG
);
1105 v
.val
= sock_flag(sk
, SOCK_LOCALROUTE
);
1109 v
.val
= sock_flag(sk
, SOCK_BROADCAST
);
1113 v
.val
= sk
->sk_sndbuf
;
1117 v
.val
= sk
->sk_rcvbuf
;
1121 v
.val
= sk
->sk_reuse
;
1125 v
.val
= sk
->sk_reuseport
;
1129 v
.val
= sock_flag(sk
, SOCK_KEEPOPEN
);
1133 v
.val
= sk
->sk_type
;
1137 v
.val
= sk
->sk_protocol
;
1141 v
.val
= sk
->sk_family
;
1145 v
.val
= -sock_error(sk
);
1147 v
.val
= xchg(&sk
->sk_err_soft
, 0);
1151 v
.val
= sock_flag(sk
, SOCK_URGINLINE
);
1155 v
.val
= sk
->sk_no_check_tx
;
1159 v
.val
= sk
->sk_priority
;
1163 lv
= sizeof(v
.ling
);
1164 v
.ling
.l_onoff
= sock_flag(sk
, SOCK_LINGER
);
1165 v
.ling
.l_linger
= sk
->sk_lingertime
/ HZ
;
1169 sock_warn_obsolete_bsdism("getsockopt");
1173 v
.val
= sock_flag(sk
, SOCK_RCVTSTAMP
) &&
1174 !sock_flag(sk
, SOCK_RCVTSTAMPNS
);
1177 case SO_TIMESTAMPNS
:
1178 v
.val
= sock_flag(sk
, SOCK_RCVTSTAMPNS
);
1181 case SO_TIMESTAMPING
:
1182 v
.val
= sk
->sk_tsflags
;
1186 lv
= sizeof(struct timeval
);
1187 if (sk
->sk_rcvtimeo
== MAX_SCHEDULE_TIMEOUT
) {
1191 v
.tm
.tv_sec
= sk
->sk_rcvtimeo
/ HZ
;
1192 v
.tm
.tv_usec
= ((sk
->sk_rcvtimeo
% HZ
) * USEC_PER_SEC
) / HZ
;
1197 lv
= sizeof(struct timeval
);
1198 if (sk
->sk_sndtimeo
== MAX_SCHEDULE_TIMEOUT
) {
1202 v
.tm
.tv_sec
= sk
->sk_sndtimeo
/ HZ
;
1203 v
.tm
.tv_usec
= ((sk
->sk_sndtimeo
% HZ
) * USEC_PER_SEC
) / HZ
;
1208 v
.val
= sk
->sk_rcvlowat
;
1216 v
.val
= !!test_bit(SOCK_PASSCRED
, &sock
->flags
);
1221 struct ucred peercred
;
1222 if (len
> sizeof(peercred
))
1223 len
= sizeof(peercred
);
1224 cred_to_ucred(sk
->sk_peer_pid
, sk
->sk_peer_cred
, &peercred
);
1225 if (copy_to_user(optval
, &peercred
, len
))
1234 if (sock
->ops
->getname(sock
, (struct sockaddr
*)address
, &lv
, 2))
1238 if (copy_to_user(optval
, address
, len
))
1243 /* Dubious BSD thing... Probably nobody even uses it, but
1244 * the UNIX standard wants it for whatever reason... -DaveM
1247 v
.val
= sk
->sk_state
== TCP_LISTEN
;
1251 v
.val
= !!test_bit(SOCK_PASSSEC
, &sock
->flags
);
1255 return security_socket_getpeersec_stream(sock
, optval
, optlen
, len
);
1258 v
.val
= sk
->sk_mark
;
1262 v
.val
= sock_flag(sk
, SOCK_RXQ_OVFL
);
1265 case SO_WIFI_STATUS
:
1266 v
.val
= sock_flag(sk
, SOCK_WIFI_STATUS
);
1270 if (!sock
->ops
->set_peek_off
)
1273 v
.val
= sk
->sk_peek_off
;
1276 v
.val
= sock_flag(sk
, SOCK_NOFCS
);
1279 case SO_BINDTODEVICE
:
1280 return sock_getbindtodevice(sk
, optval
, optlen
, len
);
1283 len
= sk_get_filter(sk
, (struct sock_filter __user
*)optval
, len
);
1289 case SO_LOCK_FILTER
:
1290 v
.val
= sock_flag(sk
, SOCK_FILTER_LOCKED
);
1293 case SO_BPF_EXTENSIONS
:
1294 v
.val
= bpf_tell_extensions();
1297 case SO_SELECT_ERR_QUEUE
:
1298 v
.val
= sock_flag(sk
, SOCK_SELECT_ERR_QUEUE
);
1301 #ifdef CONFIG_NET_RX_BUSY_POLL
1303 v
.val
= sk
->sk_ll_usec
;
1307 case SO_MAX_PACING_RATE
:
1308 v
.val
= sk
->sk_max_pacing_rate
;
1311 case SO_INCOMING_CPU
:
1312 v
.val
= sk
->sk_incoming_cpu
;
1317 u32 meminfo
[SK_MEMINFO_VARS
];
1319 if (get_user(len
, optlen
))
1322 sk_get_meminfo(sk
, meminfo
);
1324 len
= min_t(unsigned int, len
, sizeof(meminfo
));
1325 if (copy_to_user(optval
, &meminfo
, len
))
1331 #ifdef CONFIG_NET_RX_BUSY_POLL
1332 case SO_INCOMING_NAPI_ID
:
1333 v
.val
= READ_ONCE(sk
->sk_napi_id
);
1335 /* aggregate non-NAPI IDs down to 0 */
1336 if (v
.val
< MIN_NAPI_ID
)
1346 v
.val64
= sock_gen_cookie(sk
);
1350 /* We implement the SO_SNDLOWAT etc to not be settable
1353 return -ENOPROTOOPT
;
1358 if (copy_to_user(optval
, &v
, len
))
1361 if (put_user(len
, optlen
))
1367 * Initialize an sk_lock.
1369 * (We also register the sk_lock with the lock validator.)
1371 static inline void sock_lock_init(struct sock
*sk
)
1373 if (sk
->sk_kern_sock
)
1374 sock_lock_init_class_and_name(
1376 af_family_kern_slock_key_strings
[sk
->sk_family
],
1377 af_family_kern_slock_keys
+ sk
->sk_family
,
1378 af_family_kern_key_strings
[sk
->sk_family
],
1379 af_family_kern_keys
+ sk
->sk_family
);
1381 sock_lock_init_class_and_name(
1383 af_family_slock_key_strings
[sk
->sk_family
],
1384 af_family_slock_keys
+ sk
->sk_family
,
1385 af_family_key_strings
[sk
->sk_family
],
1386 af_family_keys
+ sk
->sk_family
);
1390 * Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet,
1391 * even temporarly, because of RCU lookups. sk_node should also be left as is.
1392 * We must not copy fields between sk_dontcopy_begin and sk_dontcopy_end
1394 static void sock_copy(struct sock
*nsk
, const struct sock
*osk
)
1396 #ifdef CONFIG_SECURITY_NETWORK
1397 void *sptr
= nsk
->sk_security
;
1399 memcpy(nsk
, osk
, offsetof(struct sock
, sk_dontcopy_begin
));
1401 memcpy(&nsk
->sk_dontcopy_end
, &osk
->sk_dontcopy_end
,
1402 osk
->sk_prot
->obj_size
- offsetof(struct sock
, sk_dontcopy_end
));
1404 #ifdef CONFIG_SECURITY_NETWORK
1405 nsk
->sk_security
= sptr
;
1406 security_sk_clone(osk
, nsk
);
1410 static struct sock
*sk_prot_alloc(struct proto
*prot
, gfp_t priority
,
1414 struct kmem_cache
*slab
;
1418 sk
= kmem_cache_alloc(slab
, priority
& ~__GFP_ZERO
);
1421 if (priority
& __GFP_ZERO
)
1422 sk_prot_clear_nulls(sk
, prot
->obj_size
);
1424 sk
= kmalloc(prot
->obj_size
, priority
);
1427 kmemcheck_annotate_bitfield(sk
, flags
);
1429 if (security_sk_alloc(sk
, family
, priority
))
1432 if (!try_module_get(prot
->owner
))
1434 sk_tx_queue_clear(sk
);
1440 security_sk_free(sk
);
1443 kmem_cache_free(slab
, sk
);
1449 static void sk_prot_free(struct proto
*prot
, struct sock
*sk
)
1451 struct kmem_cache
*slab
;
1452 struct module
*owner
;
1454 owner
= prot
->owner
;
1457 cgroup_sk_free(&sk
->sk_cgrp_data
);
1458 mem_cgroup_sk_free(sk
);
1459 security_sk_free(sk
);
1461 kmem_cache_free(slab
, sk
);
1468 * sk_alloc - All socket objects are allocated here
1469 * @net: the applicable net namespace
1470 * @family: protocol family
1471 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1472 * @prot: struct proto associated with this new sock instance
1473 * @kern: is this to be a kernel socket?
1475 struct sock
*sk_alloc(struct net
*net
, int family
, gfp_t priority
,
1476 struct proto
*prot
, int kern
)
1480 sk
= sk_prot_alloc(prot
, priority
| __GFP_ZERO
, family
);
1482 sk
->sk_family
= family
;
1484 * See comment in struct sock definition to understand
1485 * why we need sk_prot_creator -acme
1487 sk
->sk_prot
= sk
->sk_prot_creator
= prot
;
1488 sk
->sk_kern_sock
= kern
;
1490 sk
->sk_net_refcnt
= kern
? 0 : 1;
1491 if (likely(sk
->sk_net_refcnt
))
1493 sock_net_set(sk
, net
);
1494 atomic_set(&sk
->sk_wmem_alloc
, 1);
1496 mem_cgroup_sk_alloc(sk
);
1497 cgroup_sk_alloc(&sk
->sk_cgrp_data
);
1498 sock_update_classid(&sk
->sk_cgrp_data
);
1499 sock_update_netprioidx(&sk
->sk_cgrp_data
);
1504 EXPORT_SYMBOL(sk_alloc
);
1506 /* Sockets having SOCK_RCU_FREE will call this function after one RCU
1507 * grace period. This is the case for UDP sockets and TCP listeners.
1509 static void __sk_destruct(struct rcu_head
*head
)
1511 struct sock
*sk
= container_of(head
, struct sock
, sk_rcu
);
1512 struct sk_filter
*filter
;
1514 if (sk
->sk_destruct
)
1515 sk
->sk_destruct(sk
);
1517 filter
= rcu_dereference_check(sk
->sk_filter
,
1518 atomic_read(&sk
->sk_wmem_alloc
) == 0);
1520 sk_filter_uncharge(sk
, filter
);
1521 RCU_INIT_POINTER(sk
->sk_filter
, NULL
);
1523 if (rcu_access_pointer(sk
->sk_reuseport_cb
))
1524 reuseport_detach_sock(sk
);
1526 sock_disable_timestamp(sk
, SK_FLAGS_TIMESTAMP
);
1528 if (atomic_read(&sk
->sk_omem_alloc
))
1529 pr_debug("%s: optmem leakage (%d bytes) detected\n",
1530 __func__
, atomic_read(&sk
->sk_omem_alloc
));
1532 if (sk
->sk_frag
.page
) {
1533 put_page(sk
->sk_frag
.page
);
1534 sk
->sk_frag
.page
= NULL
;
1537 if (sk
->sk_peer_cred
)
1538 put_cred(sk
->sk_peer_cred
);
1539 put_pid(sk
->sk_peer_pid
);
1540 if (likely(sk
->sk_net_refcnt
))
1541 put_net(sock_net(sk
));
1542 sk_prot_free(sk
->sk_prot_creator
, sk
);
1545 void sk_destruct(struct sock
*sk
)
1547 if (sock_flag(sk
, SOCK_RCU_FREE
))
1548 call_rcu(&sk
->sk_rcu
, __sk_destruct
);
1550 __sk_destruct(&sk
->sk_rcu
);
1553 static void __sk_free(struct sock
*sk
)
1555 if (unlikely(sock_diag_has_destroy_listeners(sk
) && sk
->sk_net_refcnt
))
1556 sock_diag_broadcast_destroy(sk
);
1561 void sk_free(struct sock
*sk
)
1564 * We subtract one from sk_wmem_alloc and can know if
1565 * some packets are still in some tx queue.
1566 * If not null, sock_wfree() will call __sk_free(sk) later
1568 if (atomic_dec_and_test(&sk
->sk_wmem_alloc
))
1571 EXPORT_SYMBOL(sk_free
);
1573 static void sk_init_common(struct sock
*sk
)
1575 skb_queue_head_init(&sk
->sk_receive_queue
);
1576 skb_queue_head_init(&sk
->sk_write_queue
);
1577 skb_queue_head_init(&sk
->sk_error_queue
);
1579 rwlock_init(&sk
->sk_callback_lock
);
1580 lockdep_set_class_and_name(&sk
->sk_receive_queue
.lock
,
1581 af_rlock_keys
+ sk
->sk_family
,
1582 af_family_rlock_key_strings
[sk
->sk_family
]);
1583 lockdep_set_class_and_name(&sk
->sk_write_queue
.lock
,
1584 af_wlock_keys
+ sk
->sk_family
,
1585 af_family_wlock_key_strings
[sk
->sk_family
]);
1586 lockdep_set_class_and_name(&sk
->sk_error_queue
.lock
,
1587 af_elock_keys
+ sk
->sk_family
,
1588 af_family_elock_key_strings
[sk
->sk_family
]);
1589 lockdep_set_class_and_name(&sk
->sk_callback_lock
,
1590 af_callback_keys
+ sk
->sk_family
,
1591 af_family_clock_key_strings
[sk
->sk_family
]);
1595 * sk_clone_lock - clone a socket, and lock its clone
1596 * @sk: the socket to clone
1597 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
1599 * Caller must unlock socket even in error path (bh_unlock_sock(newsk))
1601 struct sock
*sk_clone_lock(const struct sock
*sk
, const gfp_t priority
)
1604 bool is_charged
= true;
1606 newsk
= sk_prot_alloc(sk
->sk_prot
, priority
, sk
->sk_family
);
1607 if (newsk
!= NULL
) {
1608 struct sk_filter
*filter
;
1610 sock_copy(newsk
, sk
);
1613 if (likely(newsk
->sk_net_refcnt
))
1614 get_net(sock_net(newsk
));
1615 sk_node_init(&newsk
->sk_node
);
1616 sock_lock_init(newsk
);
1617 bh_lock_sock(newsk
);
1618 newsk
->sk_backlog
.head
= newsk
->sk_backlog
.tail
= NULL
;
1619 newsk
->sk_backlog
.len
= 0;
1621 atomic_set(&newsk
->sk_rmem_alloc
, 0);
1623 * sk_wmem_alloc set to one (see sk_free() and sock_wfree())
1625 atomic_set(&newsk
->sk_wmem_alloc
, 1);
1626 atomic_set(&newsk
->sk_omem_alloc
, 0);
1627 sk_init_common(newsk
);
1629 newsk
->sk_dst_cache
= NULL
;
1630 newsk
->sk_dst_pending_confirm
= 0;
1631 newsk
->sk_wmem_queued
= 0;
1632 newsk
->sk_forward_alloc
= 0;
1633 atomic_set(&newsk
->sk_drops
, 0);
1634 newsk
->sk_send_head
= NULL
;
1635 newsk
->sk_userlocks
= sk
->sk_userlocks
& ~SOCK_BINDPORT_LOCK
;
1637 sock_reset_flag(newsk
, SOCK_DONE
);
1639 filter
= rcu_dereference_protected(newsk
->sk_filter
, 1);
1641 /* though it's an empty new sock, the charging may fail
1642 * if sysctl_optmem_max was changed between creation of
1643 * original socket and cloning
1645 is_charged
= sk_filter_charge(newsk
, filter
);
1647 if (unlikely(!is_charged
|| xfrm_sk_clone_policy(newsk
, sk
))) {
1648 /* We need to make sure that we don't uncharge the new
1649 * socket if we couldn't charge it in the first place
1650 * as otherwise we uncharge the parent's filter.
1653 RCU_INIT_POINTER(newsk
->sk_filter
, NULL
);
1654 sk_free_unlock_clone(newsk
);
1658 RCU_INIT_POINTER(newsk
->sk_reuseport_cb
, NULL
);
1661 newsk
->sk_err_soft
= 0;
1662 newsk
->sk_priority
= 0;
1663 newsk
->sk_incoming_cpu
= raw_smp_processor_id();
1664 atomic64_set(&newsk
->sk_cookie
, 0);
1666 mem_cgroup_sk_alloc(newsk
);
1667 cgroup_sk_alloc(&newsk
->sk_cgrp_data
);
1670 * Before updating sk_refcnt, we must commit prior changes to memory
1671 * (Documentation/RCU/rculist_nulls.txt for details)
1674 atomic_set(&newsk
->sk_refcnt
, 2);
1677 * Increment the counter in the same struct proto as the master
1678 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
1679 * is the same as sk->sk_prot->socks, as this field was copied
1682 * This _changes_ the previous behaviour, where
1683 * tcp_create_openreq_child always was incrementing the
1684 * equivalent to tcp_prot->socks (inet_sock_nr), so this have
1685 * to be taken into account in all callers. -acme
1687 sk_refcnt_debug_inc(newsk
);
1688 sk_set_socket(newsk
, NULL
);
1689 newsk
->sk_wq
= NULL
;
1691 if (newsk
->sk_prot
->sockets_allocated
)
1692 sk_sockets_allocated_inc(newsk
);
1694 if (sock_needs_netstamp(sk
) &&
1695 newsk
->sk_flags
& SK_FLAGS_TIMESTAMP
)
1696 net_enable_timestamp();
1701 EXPORT_SYMBOL_GPL(sk_clone_lock
);
1703 void sk_free_unlock_clone(struct sock
*sk
)
1705 /* It is still raw copy of parent, so invalidate
1706 * destructor and make plain sk_free() */
1707 sk
->sk_destruct
= NULL
;
1711 EXPORT_SYMBOL_GPL(sk_free_unlock_clone
);
1713 void sk_setup_caps(struct sock
*sk
, struct dst_entry
*dst
)
1717 sk_dst_set(sk
, dst
);
1718 sk
->sk_route_caps
= dst
->dev
->features
;
1719 if (sk
->sk_route_caps
& NETIF_F_GSO
)
1720 sk
->sk_route_caps
|= NETIF_F_GSO_SOFTWARE
;
1721 sk
->sk_route_caps
&= ~sk
->sk_route_nocaps
;
1722 if (sk_can_gso(sk
)) {
1723 if (dst
->header_len
) {
1724 sk
->sk_route_caps
&= ~NETIF_F_GSO_MASK
;
1726 sk
->sk_route_caps
|= NETIF_F_SG
| NETIF_F_HW_CSUM
;
1727 sk
->sk_gso_max_size
= dst
->dev
->gso_max_size
;
1728 max_segs
= max_t(u32
, dst
->dev
->gso_max_segs
, 1);
1731 sk
->sk_gso_max_segs
= max_segs
;
1733 EXPORT_SYMBOL_GPL(sk_setup_caps
);
1736 * Simple resource managers for sockets.
1741 * Write buffer destructor automatically called from kfree_skb.
1743 void sock_wfree(struct sk_buff
*skb
)
1745 struct sock
*sk
= skb
->sk
;
1746 unsigned int len
= skb
->truesize
;
1748 if (!sock_flag(sk
, SOCK_USE_WRITE_QUEUE
)) {
1750 * Keep a reference on sk_wmem_alloc, this will be released
1751 * after sk_write_space() call
1753 atomic_sub(len
- 1, &sk
->sk_wmem_alloc
);
1754 sk
->sk_write_space(sk
);
1758 * if sk_wmem_alloc reaches 0, we must finish what sk_free()
1759 * could not do because of in-flight packets
1761 if (atomic_sub_and_test(len
, &sk
->sk_wmem_alloc
))
1764 EXPORT_SYMBOL(sock_wfree
);
1766 /* This variant of sock_wfree() is used by TCP,
1767 * since it sets SOCK_USE_WRITE_QUEUE.
1769 void __sock_wfree(struct sk_buff
*skb
)
1771 struct sock
*sk
= skb
->sk
;
1773 if (atomic_sub_and_test(skb
->truesize
, &sk
->sk_wmem_alloc
))
1777 void skb_set_owner_w(struct sk_buff
*skb
, struct sock
*sk
)
1782 if (unlikely(!sk_fullsock(sk
))) {
1783 skb
->destructor
= sock_edemux
;
1788 skb
->destructor
= sock_wfree
;
1789 skb_set_hash_from_sk(skb
, sk
);
1791 * We used to take a refcount on sk, but following operation
1792 * is enough to guarantee sk_free() wont free this sock until
1793 * all in-flight packets are completed
1795 atomic_add(skb
->truesize
, &sk
->sk_wmem_alloc
);
1797 EXPORT_SYMBOL(skb_set_owner_w
);
1799 /* This helper is used by netem, as it can hold packets in its
1800 * delay queue. We want to allow the owner socket to send more
1801 * packets, as if they were already TX completed by a typical driver.
1802 * But we also want to keep skb->sk set because some packet schedulers
1803 * rely on it (sch_fq for example).
1805 void skb_orphan_partial(struct sk_buff
*skb
)
1807 if (skb_is_tcp_pure_ack(skb
))
1810 if (skb
->destructor
== sock_wfree
1812 || skb
->destructor
== tcp_wfree
1815 struct sock
*sk
= skb
->sk
;
1817 if (atomic_inc_not_zero(&sk
->sk_refcnt
)) {
1818 atomic_sub(skb
->truesize
, &sk
->sk_wmem_alloc
);
1819 skb
->destructor
= sock_efree
;
1825 EXPORT_SYMBOL(skb_orphan_partial
);
1828 * Read buffer destructor automatically called from kfree_skb.
1830 void sock_rfree(struct sk_buff
*skb
)
1832 struct sock
*sk
= skb
->sk
;
1833 unsigned int len
= skb
->truesize
;
1835 atomic_sub(len
, &sk
->sk_rmem_alloc
);
1836 sk_mem_uncharge(sk
, len
);
1838 EXPORT_SYMBOL(sock_rfree
);
1841 * Buffer destructor for skbs that are not used directly in read or write
1842 * path, e.g. for error handler skbs. Automatically called from kfree_skb.
1844 void sock_efree(struct sk_buff
*skb
)
1848 EXPORT_SYMBOL(sock_efree
);
1850 kuid_t
sock_i_uid(struct sock
*sk
)
1854 read_lock_bh(&sk
->sk_callback_lock
);
1855 uid
= sk
->sk_socket
? SOCK_INODE(sk
->sk_socket
)->i_uid
: GLOBAL_ROOT_UID
;
1856 read_unlock_bh(&sk
->sk_callback_lock
);
1859 EXPORT_SYMBOL(sock_i_uid
);
1861 unsigned long sock_i_ino(struct sock
*sk
)
1865 read_lock_bh(&sk
->sk_callback_lock
);
1866 ino
= sk
->sk_socket
? SOCK_INODE(sk
->sk_socket
)->i_ino
: 0;
1867 read_unlock_bh(&sk
->sk_callback_lock
);
1870 EXPORT_SYMBOL(sock_i_ino
);
1873 * Allocate a skb from the socket's send buffer.
1875 struct sk_buff
*sock_wmalloc(struct sock
*sk
, unsigned long size
, int force
,
1878 if (force
|| atomic_read(&sk
->sk_wmem_alloc
) < sk
->sk_sndbuf
) {
1879 struct sk_buff
*skb
= alloc_skb(size
, priority
);
1881 skb_set_owner_w(skb
, sk
);
1887 EXPORT_SYMBOL(sock_wmalloc
);
1890 * Allocate a memory block from the socket's option memory buffer.
1892 void *sock_kmalloc(struct sock
*sk
, int size
, gfp_t priority
)
1894 if ((unsigned int)size
<= sysctl_optmem_max
&&
1895 atomic_read(&sk
->sk_omem_alloc
) + size
< sysctl_optmem_max
) {
1897 /* First do the add, to avoid the race if kmalloc
1900 atomic_add(size
, &sk
->sk_omem_alloc
);
1901 mem
= kmalloc(size
, priority
);
1904 atomic_sub(size
, &sk
->sk_omem_alloc
);
1908 EXPORT_SYMBOL(sock_kmalloc
);
1910 /* Free an option memory block. Note, we actually want the inline
1911 * here as this allows gcc to detect the nullify and fold away the
1912 * condition entirely.
1914 static inline void __sock_kfree_s(struct sock
*sk
, void *mem
, int size
,
1917 if (WARN_ON_ONCE(!mem
))
1923 atomic_sub(size
, &sk
->sk_omem_alloc
);
1926 void sock_kfree_s(struct sock
*sk
, void *mem
, int size
)
1928 __sock_kfree_s(sk
, mem
, size
, false);
1930 EXPORT_SYMBOL(sock_kfree_s
);
1932 void sock_kzfree_s(struct sock
*sk
, void *mem
, int size
)
1934 __sock_kfree_s(sk
, mem
, size
, true);
1936 EXPORT_SYMBOL(sock_kzfree_s
);
1938 /* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
1939 I think, these locks should be removed for datagram sockets.
1941 static long sock_wait_for_wmem(struct sock
*sk
, long timeo
)
1945 sk_clear_bit(SOCKWQ_ASYNC_NOSPACE
, sk
);
1949 if (signal_pending(current
))
1951 set_bit(SOCK_NOSPACE
, &sk
->sk_socket
->flags
);
1952 prepare_to_wait(sk_sleep(sk
), &wait
, TASK_INTERRUPTIBLE
);
1953 if (atomic_read(&sk
->sk_wmem_alloc
) < sk
->sk_sndbuf
)
1955 if (sk
->sk_shutdown
& SEND_SHUTDOWN
)
1959 timeo
= schedule_timeout(timeo
);
1961 finish_wait(sk_sleep(sk
), &wait
);
1967 * Generic send/receive buffer handlers
1970 struct sk_buff
*sock_alloc_send_pskb(struct sock
*sk
, unsigned long header_len
,
1971 unsigned long data_len
, int noblock
,
1972 int *errcode
, int max_page_order
)
1974 struct sk_buff
*skb
;
1978 timeo
= sock_sndtimeo(sk
, noblock
);
1980 err
= sock_error(sk
);
1985 if (sk
->sk_shutdown
& SEND_SHUTDOWN
)
1988 if (sk_wmem_alloc_get(sk
) < sk
->sk_sndbuf
)
1991 sk_set_bit(SOCKWQ_ASYNC_NOSPACE
, sk
);
1992 set_bit(SOCK_NOSPACE
, &sk
->sk_socket
->flags
);
1996 if (signal_pending(current
))
1998 timeo
= sock_wait_for_wmem(sk
, timeo
);
2000 skb
= alloc_skb_with_frags(header_len
, data_len
, max_page_order
,
2001 errcode
, sk
->sk_allocation
);
2003 skb_set_owner_w(skb
, sk
);
2007 err
= sock_intr_errno(timeo
);
2012 EXPORT_SYMBOL(sock_alloc_send_pskb
);
2014 struct sk_buff
*sock_alloc_send_skb(struct sock
*sk
, unsigned long size
,
2015 int noblock
, int *errcode
)
2017 return sock_alloc_send_pskb(sk
, size
, 0, noblock
, errcode
, 0);
2019 EXPORT_SYMBOL(sock_alloc_send_skb
);
2021 int __sock_cmsg_send(struct sock
*sk
, struct msghdr
*msg
, struct cmsghdr
*cmsg
,
2022 struct sockcm_cookie
*sockc
)
2026 switch (cmsg
->cmsg_type
) {
2028 if (!ns_capable(sock_net(sk
)->user_ns
, CAP_NET_ADMIN
))
2030 if (cmsg
->cmsg_len
!= CMSG_LEN(sizeof(u32
)))
2032 sockc
->mark
= *(u32
*)CMSG_DATA(cmsg
);
2034 case SO_TIMESTAMPING
:
2035 if (cmsg
->cmsg_len
!= CMSG_LEN(sizeof(u32
)))
2038 tsflags
= *(u32
*)CMSG_DATA(cmsg
);
2039 if (tsflags
& ~SOF_TIMESTAMPING_TX_RECORD_MASK
)
2042 sockc
->tsflags
&= ~SOF_TIMESTAMPING_TX_RECORD_MASK
;
2043 sockc
->tsflags
|= tsflags
;
2045 /* SCM_RIGHTS and SCM_CREDENTIALS are semantically in SOL_UNIX. */
2047 case SCM_CREDENTIALS
:
2054 EXPORT_SYMBOL(__sock_cmsg_send
);
2056 int sock_cmsg_send(struct sock
*sk
, struct msghdr
*msg
,
2057 struct sockcm_cookie
*sockc
)
2059 struct cmsghdr
*cmsg
;
2062 for_each_cmsghdr(cmsg
, msg
) {
2063 if (!CMSG_OK(msg
, cmsg
))
2065 if (cmsg
->cmsg_level
!= SOL_SOCKET
)
2067 ret
= __sock_cmsg_send(sk
, msg
, cmsg
, sockc
);
2073 EXPORT_SYMBOL(sock_cmsg_send
);
2075 /* On 32bit arches, an skb frag is limited to 2^15 */
2076 #define SKB_FRAG_PAGE_ORDER get_order(32768)
2079 * skb_page_frag_refill - check that a page_frag contains enough room
2080 * @sz: minimum size of the fragment we want to get
2081 * @pfrag: pointer to page_frag
2082 * @gfp: priority for memory allocation
2084 * Note: While this allocator tries to use high order pages, there is
2085 * no guarantee that allocations succeed. Therefore, @sz MUST be
2086 * less or equal than PAGE_SIZE.
2088 bool skb_page_frag_refill(unsigned int sz
, struct page_frag
*pfrag
, gfp_t gfp
)
2091 if (page_ref_count(pfrag
->page
) == 1) {
2095 if (pfrag
->offset
+ sz
<= pfrag
->size
)
2097 put_page(pfrag
->page
);
2101 if (SKB_FRAG_PAGE_ORDER
) {
2102 /* Avoid direct reclaim but allow kswapd to wake */
2103 pfrag
->page
= alloc_pages((gfp
& ~__GFP_DIRECT_RECLAIM
) |
2104 __GFP_COMP
| __GFP_NOWARN
|
2106 SKB_FRAG_PAGE_ORDER
);
2107 if (likely(pfrag
->page
)) {
2108 pfrag
->size
= PAGE_SIZE
<< SKB_FRAG_PAGE_ORDER
;
2112 pfrag
->page
= alloc_page(gfp
);
2113 if (likely(pfrag
->page
)) {
2114 pfrag
->size
= PAGE_SIZE
;
2119 EXPORT_SYMBOL(skb_page_frag_refill
);
2121 bool sk_page_frag_refill(struct sock
*sk
, struct page_frag
*pfrag
)
2123 if (likely(skb_page_frag_refill(32U, pfrag
, sk
->sk_allocation
)))
2126 sk_enter_memory_pressure(sk
);
2127 sk_stream_moderate_sndbuf(sk
);
2130 EXPORT_SYMBOL(sk_page_frag_refill
);
2132 static void __lock_sock(struct sock
*sk
)
2133 __releases(&sk
->sk_lock
.slock
)
2134 __acquires(&sk
->sk_lock
.slock
)
2139 prepare_to_wait_exclusive(&sk
->sk_lock
.wq
, &wait
,
2140 TASK_UNINTERRUPTIBLE
);
2141 spin_unlock_bh(&sk
->sk_lock
.slock
);
2143 spin_lock_bh(&sk
->sk_lock
.slock
);
2144 if (!sock_owned_by_user(sk
))
2147 finish_wait(&sk
->sk_lock
.wq
, &wait
);
2150 static void __release_sock(struct sock
*sk
)
2151 __releases(&sk
->sk_lock
.slock
)
2152 __acquires(&sk
->sk_lock
.slock
)
2154 struct sk_buff
*skb
, *next
;
2156 while ((skb
= sk
->sk_backlog
.head
) != NULL
) {
2157 sk
->sk_backlog
.head
= sk
->sk_backlog
.tail
= NULL
;
2159 spin_unlock_bh(&sk
->sk_lock
.slock
);
2164 WARN_ON_ONCE(skb_dst_is_noref(skb
));
2166 sk_backlog_rcv(sk
, skb
);
2171 } while (skb
!= NULL
);
2173 spin_lock_bh(&sk
->sk_lock
.slock
);
2177 * Doing the zeroing here guarantee we can not loop forever
2178 * while a wild producer attempts to flood us.
2180 sk
->sk_backlog
.len
= 0;
2183 void __sk_flush_backlog(struct sock
*sk
)
2185 spin_lock_bh(&sk
->sk_lock
.slock
);
2187 spin_unlock_bh(&sk
->sk_lock
.slock
);
2191 * sk_wait_data - wait for data to arrive at sk_receive_queue
2192 * @sk: sock to wait on
2193 * @timeo: for how long
2194 * @skb: last skb seen on sk_receive_queue
2196 * Now socket state including sk->sk_err is changed only under lock,
2197 * hence we may omit checks after joining wait queue.
2198 * We check receive queue before schedule() only as optimization;
2199 * it is very likely that release_sock() added new data.
2201 int sk_wait_data(struct sock
*sk
, long *timeo
, const struct sk_buff
*skb
)
2203 DEFINE_WAIT_FUNC(wait
, woken_wake_function
);
2206 add_wait_queue(sk_sleep(sk
), &wait
);
2207 sk_set_bit(SOCKWQ_ASYNC_WAITDATA
, sk
);
2208 rc
= sk_wait_event(sk
, timeo
, skb_peek_tail(&sk
->sk_receive_queue
) != skb
, &wait
);
2209 sk_clear_bit(SOCKWQ_ASYNC_WAITDATA
, sk
);
2210 remove_wait_queue(sk_sleep(sk
), &wait
);
2213 EXPORT_SYMBOL(sk_wait_data
);
2216 * __sk_mem_raise_allocated - increase memory_allocated
2218 * @size: memory size to allocate
2219 * @amt: pages to allocate
2220 * @kind: allocation type
2222 * Similar to __sk_mem_schedule(), but does not update sk_forward_alloc
2224 int __sk_mem_raise_allocated(struct sock
*sk
, int size
, int amt
, int kind
)
2226 struct proto
*prot
= sk
->sk_prot
;
2227 long allocated
= sk_memory_allocated_add(sk
, amt
);
2229 if (mem_cgroup_sockets_enabled
&& sk
->sk_memcg
&&
2230 !mem_cgroup_charge_skmem(sk
->sk_memcg
, amt
))
2231 goto suppress_allocation
;
2234 if (allocated
<= sk_prot_mem_limits(sk
, 0)) {
2235 sk_leave_memory_pressure(sk
);
2239 /* Under pressure. */
2240 if (allocated
> sk_prot_mem_limits(sk
, 1))
2241 sk_enter_memory_pressure(sk
);
2243 /* Over hard limit. */
2244 if (allocated
> sk_prot_mem_limits(sk
, 2))
2245 goto suppress_allocation
;
2247 /* guarantee minimum buffer size under pressure */
2248 if (kind
== SK_MEM_RECV
) {
2249 if (atomic_read(&sk
->sk_rmem_alloc
) < prot
->sysctl_rmem
[0])
2252 } else { /* SK_MEM_SEND */
2253 if (sk
->sk_type
== SOCK_STREAM
) {
2254 if (sk
->sk_wmem_queued
< prot
->sysctl_wmem
[0])
2256 } else if (atomic_read(&sk
->sk_wmem_alloc
) <
2257 prot
->sysctl_wmem
[0])
2261 if (sk_has_memory_pressure(sk
)) {
2264 if (!sk_under_memory_pressure(sk
))
2266 alloc
= sk_sockets_allocated_read_positive(sk
);
2267 if (sk_prot_mem_limits(sk
, 2) > alloc
*
2268 sk_mem_pages(sk
->sk_wmem_queued
+
2269 atomic_read(&sk
->sk_rmem_alloc
) +
2270 sk
->sk_forward_alloc
))
2274 suppress_allocation
:
2276 if (kind
== SK_MEM_SEND
&& sk
->sk_type
== SOCK_STREAM
) {
2277 sk_stream_moderate_sndbuf(sk
);
2279 /* Fail only if socket is _under_ its sndbuf.
2280 * In this case we cannot block, so that we have to fail.
2282 if (sk
->sk_wmem_queued
+ size
>= sk
->sk_sndbuf
)
2286 trace_sock_exceed_buf_limit(sk
, prot
, allocated
);
2288 sk_memory_allocated_sub(sk
, amt
);
2290 if (mem_cgroup_sockets_enabled
&& sk
->sk_memcg
)
2291 mem_cgroup_uncharge_skmem(sk
->sk_memcg
, amt
);
2295 EXPORT_SYMBOL(__sk_mem_raise_allocated
);
2298 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated
2300 * @size: memory size to allocate
2301 * @kind: allocation type
2303 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means
2304 * rmem allocation. This function assumes that protocols which have
2305 * memory_pressure use sk_wmem_queued as write buffer accounting.
2307 int __sk_mem_schedule(struct sock
*sk
, int size
, int kind
)
2309 int ret
, amt
= sk_mem_pages(size
);
2311 sk
->sk_forward_alloc
+= amt
<< SK_MEM_QUANTUM_SHIFT
;
2312 ret
= __sk_mem_raise_allocated(sk
, size
, amt
, kind
);
2314 sk
->sk_forward_alloc
-= amt
<< SK_MEM_QUANTUM_SHIFT
;
2317 EXPORT_SYMBOL(__sk_mem_schedule
);
2320 * __sk_mem_reduce_allocated - reclaim memory_allocated
2322 * @amount: number of quanta
2324 * Similar to __sk_mem_reclaim(), but does not update sk_forward_alloc
2326 void __sk_mem_reduce_allocated(struct sock
*sk
, int amount
)
2328 sk_memory_allocated_sub(sk
, amount
);
2330 if (mem_cgroup_sockets_enabled
&& sk
->sk_memcg
)
2331 mem_cgroup_uncharge_skmem(sk
->sk_memcg
, amount
);
2333 if (sk_under_memory_pressure(sk
) &&
2334 (sk_memory_allocated(sk
) < sk_prot_mem_limits(sk
, 0)))
2335 sk_leave_memory_pressure(sk
);
2337 EXPORT_SYMBOL(__sk_mem_reduce_allocated
);
2340 * __sk_mem_reclaim - reclaim sk_forward_alloc and memory_allocated
2342 * @amount: number of bytes (rounded down to a SK_MEM_QUANTUM multiple)
2344 void __sk_mem_reclaim(struct sock
*sk
, int amount
)
2346 amount
>>= SK_MEM_QUANTUM_SHIFT
;
2347 sk
->sk_forward_alloc
-= amount
<< SK_MEM_QUANTUM_SHIFT
;
2348 __sk_mem_reduce_allocated(sk
, amount
);
2350 EXPORT_SYMBOL(__sk_mem_reclaim
);
2352 int sk_set_peek_off(struct sock
*sk
, int val
)
2357 sk
->sk_peek_off
= val
;
2360 EXPORT_SYMBOL_GPL(sk_set_peek_off
);
2363 * Set of default routines for initialising struct proto_ops when
2364 * the protocol does not support a particular function. In certain
2365 * cases where it makes no sense for a protocol to have a "do nothing"
2366 * function, some default processing is provided.
2369 int sock_no_bind(struct socket
*sock
, struct sockaddr
*saddr
, int len
)
2373 EXPORT_SYMBOL(sock_no_bind
);
2375 int sock_no_connect(struct socket
*sock
, struct sockaddr
*saddr
,
2380 EXPORT_SYMBOL(sock_no_connect
);
2382 int sock_no_socketpair(struct socket
*sock1
, struct socket
*sock2
)
2386 EXPORT_SYMBOL(sock_no_socketpair
);
2388 int sock_no_accept(struct socket
*sock
, struct socket
*newsock
, int flags
,
2393 EXPORT_SYMBOL(sock_no_accept
);
2395 int sock_no_getname(struct socket
*sock
, struct sockaddr
*saddr
,
2400 EXPORT_SYMBOL(sock_no_getname
);
2402 unsigned int sock_no_poll(struct file
*file
, struct socket
*sock
, poll_table
*pt
)
2406 EXPORT_SYMBOL(sock_no_poll
);
2408 int sock_no_ioctl(struct socket
*sock
, unsigned int cmd
, unsigned long arg
)
2412 EXPORT_SYMBOL(sock_no_ioctl
);
2414 int sock_no_listen(struct socket
*sock
, int backlog
)
2418 EXPORT_SYMBOL(sock_no_listen
);
2420 int sock_no_shutdown(struct socket
*sock
, int how
)
2424 EXPORT_SYMBOL(sock_no_shutdown
);
2426 int sock_no_setsockopt(struct socket
*sock
, int level
, int optname
,
2427 char __user
*optval
, unsigned int optlen
)
2431 EXPORT_SYMBOL(sock_no_setsockopt
);
2433 int sock_no_getsockopt(struct socket
*sock
, int level
, int optname
,
2434 char __user
*optval
, int __user
*optlen
)
2438 EXPORT_SYMBOL(sock_no_getsockopt
);
2440 int sock_no_sendmsg(struct socket
*sock
, struct msghdr
*m
, size_t len
)
2444 EXPORT_SYMBOL(sock_no_sendmsg
);
2446 int sock_no_recvmsg(struct socket
*sock
, struct msghdr
*m
, size_t len
,
2451 EXPORT_SYMBOL(sock_no_recvmsg
);
2453 int sock_no_mmap(struct file
*file
, struct socket
*sock
, struct vm_area_struct
*vma
)
2455 /* Mirror missing mmap method error code */
2458 EXPORT_SYMBOL(sock_no_mmap
);
2460 ssize_t
sock_no_sendpage(struct socket
*sock
, struct page
*page
, int offset
, size_t size
, int flags
)
2463 struct msghdr msg
= {.msg_flags
= flags
};
2465 char *kaddr
= kmap(page
);
2466 iov
.iov_base
= kaddr
+ offset
;
2468 res
= kernel_sendmsg(sock
, &msg
, &iov
, 1, size
);
2472 EXPORT_SYMBOL(sock_no_sendpage
);
2475 * Default Socket Callbacks
2478 static void sock_def_wakeup(struct sock
*sk
)
2480 struct socket_wq
*wq
;
2483 wq
= rcu_dereference(sk
->sk_wq
);
2484 if (skwq_has_sleeper(wq
))
2485 wake_up_interruptible_all(&wq
->wait
);
2489 static void sock_def_error_report(struct sock
*sk
)
2491 struct socket_wq
*wq
;
2494 wq
= rcu_dereference(sk
->sk_wq
);
2495 if (skwq_has_sleeper(wq
))
2496 wake_up_interruptible_poll(&wq
->wait
, POLLERR
);
2497 sk_wake_async(sk
, SOCK_WAKE_IO
, POLL_ERR
);
2501 static void sock_def_readable(struct sock
*sk
)
2503 struct socket_wq
*wq
;
2506 wq
= rcu_dereference(sk
->sk_wq
);
2507 if (skwq_has_sleeper(wq
))
2508 wake_up_interruptible_sync_poll(&wq
->wait
, POLLIN
| POLLPRI
|
2509 POLLRDNORM
| POLLRDBAND
);
2510 sk_wake_async(sk
, SOCK_WAKE_WAITD
, POLL_IN
);
2514 static void sock_def_write_space(struct sock
*sk
)
2516 struct socket_wq
*wq
;
2520 /* Do not wake up a writer until he can make "significant"
2523 if ((atomic_read(&sk
->sk_wmem_alloc
) << 1) <= sk
->sk_sndbuf
) {
2524 wq
= rcu_dereference(sk
->sk_wq
);
2525 if (skwq_has_sleeper(wq
))
2526 wake_up_interruptible_sync_poll(&wq
->wait
, POLLOUT
|
2527 POLLWRNORM
| POLLWRBAND
);
2529 /* Should agree with poll, otherwise some programs break */
2530 if (sock_writeable(sk
))
2531 sk_wake_async(sk
, SOCK_WAKE_SPACE
, POLL_OUT
);
2537 static void sock_def_destruct(struct sock
*sk
)
2541 void sk_send_sigurg(struct sock
*sk
)
2543 if (sk
->sk_socket
&& sk
->sk_socket
->file
)
2544 if (send_sigurg(&sk
->sk_socket
->file
->f_owner
))
2545 sk_wake_async(sk
, SOCK_WAKE_URG
, POLL_PRI
);
2547 EXPORT_SYMBOL(sk_send_sigurg
);
2549 void sk_reset_timer(struct sock
*sk
, struct timer_list
* timer
,
2550 unsigned long expires
)
2552 if (!mod_timer(timer
, expires
))
2555 EXPORT_SYMBOL(sk_reset_timer
);
2557 void sk_stop_timer(struct sock
*sk
, struct timer_list
* timer
)
2559 if (del_timer(timer
))
2562 EXPORT_SYMBOL(sk_stop_timer
);
2564 void sock_init_data(struct socket
*sock
, struct sock
*sk
)
2567 sk
->sk_send_head
= NULL
;
2569 init_timer(&sk
->sk_timer
);
2571 sk
->sk_allocation
= GFP_KERNEL
;
2572 sk
->sk_rcvbuf
= sysctl_rmem_default
;
2573 sk
->sk_sndbuf
= sysctl_wmem_default
;
2574 sk
->sk_state
= TCP_CLOSE
;
2575 sk_set_socket(sk
, sock
);
2577 sock_set_flag(sk
, SOCK_ZAPPED
);
2580 sk
->sk_type
= sock
->type
;
2581 sk
->sk_wq
= sock
->wq
;
2583 sk
->sk_uid
= SOCK_INODE(sock
)->i_uid
;
2586 sk
->sk_uid
= make_kuid(sock_net(sk
)->user_ns
, 0);
2589 rwlock_init(&sk
->sk_callback_lock
);
2590 if (sk
->sk_kern_sock
)
2591 lockdep_set_class_and_name(
2592 &sk
->sk_callback_lock
,
2593 af_kern_callback_keys
+ sk
->sk_family
,
2594 af_family_kern_clock_key_strings
[sk
->sk_family
]);
2596 lockdep_set_class_and_name(
2597 &sk
->sk_callback_lock
,
2598 af_callback_keys
+ sk
->sk_family
,
2599 af_family_clock_key_strings
[sk
->sk_family
]);
2601 sk
->sk_state_change
= sock_def_wakeup
;
2602 sk
->sk_data_ready
= sock_def_readable
;
2603 sk
->sk_write_space
= sock_def_write_space
;
2604 sk
->sk_error_report
= sock_def_error_report
;
2605 sk
->sk_destruct
= sock_def_destruct
;
2607 sk
->sk_frag
.page
= NULL
;
2608 sk
->sk_frag
.offset
= 0;
2609 sk
->sk_peek_off
= -1;
2611 sk
->sk_peer_pid
= NULL
;
2612 sk
->sk_peer_cred
= NULL
;
2613 sk
->sk_write_pending
= 0;
2614 sk
->sk_rcvlowat
= 1;
2615 sk
->sk_rcvtimeo
= MAX_SCHEDULE_TIMEOUT
;
2616 sk
->sk_sndtimeo
= MAX_SCHEDULE_TIMEOUT
;
2618 sk
->sk_stamp
= SK_DEFAULT_STAMP
;
2620 #ifdef CONFIG_NET_RX_BUSY_POLL
2622 sk
->sk_ll_usec
= sysctl_net_busy_read
;
2625 sk
->sk_max_pacing_rate
= ~0U;
2626 sk
->sk_pacing_rate
= ~0U;
2627 sk
->sk_incoming_cpu
= -1;
2629 * Before updating sk_refcnt, we must commit prior changes to memory
2630 * (Documentation/RCU/rculist_nulls.txt for details)
2633 atomic_set(&sk
->sk_refcnt
, 1);
2634 atomic_set(&sk
->sk_drops
, 0);
2636 EXPORT_SYMBOL(sock_init_data
);
2638 void lock_sock_nested(struct sock
*sk
, int subclass
)
2641 spin_lock_bh(&sk
->sk_lock
.slock
);
2642 if (sk
->sk_lock
.owned
)
2644 sk
->sk_lock
.owned
= 1;
2645 spin_unlock(&sk
->sk_lock
.slock
);
2647 * The sk_lock has mutex_lock() semantics here:
2649 mutex_acquire(&sk
->sk_lock
.dep_map
, subclass
, 0, _RET_IP_
);
2652 EXPORT_SYMBOL(lock_sock_nested
);
2654 void release_sock(struct sock
*sk
)
2656 spin_lock_bh(&sk
->sk_lock
.slock
);
2657 if (sk
->sk_backlog
.tail
)
2660 /* Warning : release_cb() might need to release sk ownership,
2661 * ie call sock_release_ownership(sk) before us.
2663 if (sk
->sk_prot
->release_cb
)
2664 sk
->sk_prot
->release_cb(sk
);
2666 sock_release_ownership(sk
);
2667 if (waitqueue_active(&sk
->sk_lock
.wq
))
2668 wake_up(&sk
->sk_lock
.wq
);
2669 spin_unlock_bh(&sk
->sk_lock
.slock
);
2671 EXPORT_SYMBOL(release_sock
);
2674 * lock_sock_fast - fast version of lock_sock
2677 * This version should be used for very small section, where process wont block
2678 * return false if fast path is taken
2679 * sk_lock.slock locked, owned = 0, BH disabled
2680 * return true if slow path is taken
2681 * sk_lock.slock unlocked, owned = 1, BH enabled
2683 bool lock_sock_fast(struct sock
*sk
)
2686 spin_lock_bh(&sk
->sk_lock
.slock
);
2688 if (!sk
->sk_lock
.owned
)
2690 * Note : We must disable BH
2695 sk
->sk_lock
.owned
= 1;
2696 spin_unlock(&sk
->sk_lock
.slock
);
2698 * The sk_lock has mutex_lock() semantics here:
2700 mutex_acquire(&sk
->sk_lock
.dep_map
, 0, 0, _RET_IP_
);
2704 EXPORT_SYMBOL(lock_sock_fast
);
2706 int sock_get_timestamp(struct sock
*sk
, struct timeval __user
*userstamp
)
2709 if (!sock_flag(sk
, SOCK_TIMESTAMP
))
2710 sock_enable_timestamp(sk
, SOCK_TIMESTAMP
);
2711 tv
= ktime_to_timeval(sk
->sk_stamp
);
2712 if (tv
.tv_sec
== -1)
2714 if (tv
.tv_sec
== 0) {
2715 sk
->sk_stamp
= ktime_get_real();
2716 tv
= ktime_to_timeval(sk
->sk_stamp
);
2718 return copy_to_user(userstamp
, &tv
, sizeof(tv
)) ? -EFAULT
: 0;
2720 EXPORT_SYMBOL(sock_get_timestamp
);
2722 int sock_get_timestampns(struct sock
*sk
, struct timespec __user
*userstamp
)
2725 if (!sock_flag(sk
, SOCK_TIMESTAMP
))
2726 sock_enable_timestamp(sk
, SOCK_TIMESTAMP
);
2727 ts
= ktime_to_timespec(sk
->sk_stamp
);
2728 if (ts
.tv_sec
== -1)
2730 if (ts
.tv_sec
== 0) {
2731 sk
->sk_stamp
= ktime_get_real();
2732 ts
= ktime_to_timespec(sk
->sk_stamp
);
2734 return copy_to_user(userstamp
, &ts
, sizeof(ts
)) ? -EFAULT
: 0;
2736 EXPORT_SYMBOL(sock_get_timestampns
);
2738 void sock_enable_timestamp(struct sock
*sk
, int flag
)
2740 if (!sock_flag(sk
, flag
)) {
2741 unsigned long previous_flags
= sk
->sk_flags
;
2743 sock_set_flag(sk
, flag
);
2745 * we just set one of the two flags which require net
2746 * time stamping, but time stamping might have been on
2747 * already because of the other one
2749 if (sock_needs_netstamp(sk
) &&
2750 !(previous_flags
& SK_FLAGS_TIMESTAMP
))
2751 net_enable_timestamp();
2755 int sock_recv_errqueue(struct sock
*sk
, struct msghdr
*msg
, int len
,
2756 int level
, int type
)
2758 struct sock_exterr_skb
*serr
;
2759 struct sk_buff
*skb
;
2763 skb
= sock_dequeue_err_skb(sk
);
2769 msg
->msg_flags
|= MSG_TRUNC
;
2772 err
= skb_copy_datagram_msg(skb
, 0, msg
, copied
);
2776 sock_recv_timestamp(msg
, sk
, skb
);
2778 serr
= SKB_EXT_ERR(skb
);
2779 put_cmsg(msg
, level
, type
, sizeof(serr
->ee
), &serr
->ee
);
2781 msg
->msg_flags
|= MSG_ERRQUEUE
;
2789 EXPORT_SYMBOL(sock_recv_errqueue
);
2792 * Get a socket option on an socket.
2794 * FIX: POSIX 1003.1g is very ambiguous here. It states that
2795 * asynchronous errors should be reported by getsockopt. We assume
2796 * this means if you specify SO_ERROR (otherwise whats the point of it).
2798 int sock_common_getsockopt(struct socket
*sock
, int level
, int optname
,
2799 char __user
*optval
, int __user
*optlen
)
2801 struct sock
*sk
= sock
->sk
;
2803 return sk
->sk_prot
->getsockopt(sk
, level
, optname
, optval
, optlen
);
2805 EXPORT_SYMBOL(sock_common_getsockopt
);
2807 #ifdef CONFIG_COMPAT
2808 int compat_sock_common_getsockopt(struct socket
*sock
, int level
, int optname
,
2809 char __user
*optval
, int __user
*optlen
)
2811 struct sock
*sk
= sock
->sk
;
2813 if (sk
->sk_prot
->compat_getsockopt
!= NULL
)
2814 return sk
->sk_prot
->compat_getsockopt(sk
, level
, optname
,
2816 return sk
->sk_prot
->getsockopt(sk
, level
, optname
, optval
, optlen
);
2818 EXPORT_SYMBOL(compat_sock_common_getsockopt
);
2821 int sock_common_recvmsg(struct socket
*sock
, struct msghdr
*msg
, size_t size
,
2824 struct sock
*sk
= sock
->sk
;
2828 err
= sk
->sk_prot
->recvmsg(sk
, msg
, size
, flags
& MSG_DONTWAIT
,
2829 flags
& ~MSG_DONTWAIT
, &addr_len
);
2831 msg
->msg_namelen
= addr_len
;
2834 EXPORT_SYMBOL(sock_common_recvmsg
);
2837 * Set socket options on an inet socket.
2839 int sock_common_setsockopt(struct socket
*sock
, int level
, int optname
,
2840 char __user
*optval
, unsigned int optlen
)
2842 struct sock
*sk
= sock
->sk
;
2844 return sk
->sk_prot
->setsockopt(sk
, level
, optname
, optval
, optlen
);
2846 EXPORT_SYMBOL(sock_common_setsockopt
);
2848 #ifdef CONFIG_COMPAT
2849 int compat_sock_common_setsockopt(struct socket
*sock
, int level
, int optname
,
2850 char __user
*optval
, unsigned int optlen
)
2852 struct sock
*sk
= sock
->sk
;
2854 if (sk
->sk_prot
->compat_setsockopt
!= NULL
)
2855 return sk
->sk_prot
->compat_setsockopt(sk
, level
, optname
,
2857 return sk
->sk_prot
->setsockopt(sk
, level
, optname
, optval
, optlen
);
2859 EXPORT_SYMBOL(compat_sock_common_setsockopt
);
2862 void sk_common_release(struct sock
*sk
)
2864 if (sk
->sk_prot
->destroy
)
2865 sk
->sk_prot
->destroy(sk
);
2868 * Observation: when sock_common_release is called, processes have
2869 * no access to socket. But net still has.
2870 * Step one, detach it from networking:
2872 * A. Remove from hash tables.
2875 sk
->sk_prot
->unhash(sk
);
2878 * In this point socket cannot receive new packets, but it is possible
2879 * that some packets are in flight because some CPU runs receiver and
2880 * did hash table lookup before we unhashed socket. They will achieve
2881 * receive queue and will be purged by socket destructor.
2883 * Also we still have packets pending on receive queue and probably,
2884 * our own packets waiting in device queues. sock_destroy will drain
2885 * receive queue, but transmitted packets will delay socket destruction
2886 * until the last reference will be released.
2891 xfrm_sk_free_policy(sk
);
2893 sk_refcnt_debug_release(sk
);
2897 EXPORT_SYMBOL(sk_common_release
);
2899 void sk_get_meminfo(const struct sock
*sk
, u32
*mem
)
2901 memset(mem
, 0, sizeof(*mem
) * SK_MEMINFO_VARS
);
2903 mem
[SK_MEMINFO_RMEM_ALLOC
] = sk_rmem_alloc_get(sk
);
2904 mem
[SK_MEMINFO_RCVBUF
] = sk
->sk_rcvbuf
;
2905 mem
[SK_MEMINFO_WMEM_ALLOC
] = sk_wmem_alloc_get(sk
);
2906 mem
[SK_MEMINFO_SNDBUF
] = sk
->sk_sndbuf
;
2907 mem
[SK_MEMINFO_FWD_ALLOC
] = sk
->sk_forward_alloc
;
2908 mem
[SK_MEMINFO_WMEM_QUEUED
] = sk
->sk_wmem_queued
;
2909 mem
[SK_MEMINFO_OPTMEM
] = atomic_read(&sk
->sk_omem_alloc
);
2910 mem
[SK_MEMINFO_BACKLOG
] = sk
->sk_backlog
.len
;
2911 mem
[SK_MEMINFO_DROPS
] = atomic_read(&sk
->sk_drops
);
2914 #ifdef CONFIG_PROC_FS
2915 #define PROTO_INUSE_NR 64 /* should be enough for the first time */
2917 int val
[PROTO_INUSE_NR
];
2920 static DECLARE_BITMAP(proto_inuse_idx
, PROTO_INUSE_NR
);
2922 #ifdef CONFIG_NET_NS
2923 void sock_prot_inuse_add(struct net
*net
, struct proto
*prot
, int val
)
2925 __this_cpu_add(net
->core
.inuse
->val
[prot
->inuse_idx
], val
);
2927 EXPORT_SYMBOL_GPL(sock_prot_inuse_add
);
2929 int sock_prot_inuse_get(struct net
*net
, struct proto
*prot
)
2931 int cpu
, idx
= prot
->inuse_idx
;
2934 for_each_possible_cpu(cpu
)
2935 res
+= per_cpu_ptr(net
->core
.inuse
, cpu
)->val
[idx
];
2937 return res
>= 0 ? res
: 0;
2939 EXPORT_SYMBOL_GPL(sock_prot_inuse_get
);
2941 static int __net_init
sock_inuse_init_net(struct net
*net
)
2943 net
->core
.inuse
= alloc_percpu(struct prot_inuse
);
2944 return net
->core
.inuse
? 0 : -ENOMEM
;
2947 static void __net_exit
sock_inuse_exit_net(struct net
*net
)
2949 free_percpu(net
->core
.inuse
);
2952 static struct pernet_operations net_inuse_ops
= {
2953 .init
= sock_inuse_init_net
,
2954 .exit
= sock_inuse_exit_net
,
2957 static __init
int net_inuse_init(void)
2959 if (register_pernet_subsys(&net_inuse_ops
))
2960 panic("Cannot initialize net inuse counters");
2965 core_initcall(net_inuse_init
);
2967 static DEFINE_PER_CPU(struct prot_inuse
, prot_inuse
);
2969 void sock_prot_inuse_add(struct net
*net
, struct proto
*prot
, int val
)
2971 __this_cpu_add(prot_inuse
.val
[prot
->inuse_idx
], val
);
2973 EXPORT_SYMBOL_GPL(sock_prot_inuse_add
);
2975 int sock_prot_inuse_get(struct net
*net
, struct proto
*prot
)
2977 int cpu
, idx
= prot
->inuse_idx
;
2980 for_each_possible_cpu(cpu
)
2981 res
+= per_cpu(prot_inuse
, cpu
).val
[idx
];
2983 return res
>= 0 ? res
: 0;
2985 EXPORT_SYMBOL_GPL(sock_prot_inuse_get
);
2988 static void assign_proto_idx(struct proto
*prot
)
2990 prot
->inuse_idx
= find_first_zero_bit(proto_inuse_idx
, PROTO_INUSE_NR
);
2992 if (unlikely(prot
->inuse_idx
== PROTO_INUSE_NR
- 1)) {
2993 pr_err("PROTO_INUSE_NR exhausted\n");
2997 set_bit(prot
->inuse_idx
, proto_inuse_idx
);
3000 static void release_proto_idx(struct proto
*prot
)
3002 if (prot
->inuse_idx
!= PROTO_INUSE_NR
- 1)
3003 clear_bit(prot
->inuse_idx
, proto_inuse_idx
);
3006 static inline void assign_proto_idx(struct proto
*prot
)
3010 static inline void release_proto_idx(struct proto
*prot
)
3015 static void req_prot_cleanup(struct request_sock_ops
*rsk_prot
)
3019 kfree(rsk_prot
->slab_name
);
3020 rsk_prot
->slab_name
= NULL
;
3021 kmem_cache_destroy(rsk_prot
->slab
);
3022 rsk_prot
->slab
= NULL
;
3025 static int req_prot_init(const struct proto
*prot
)
3027 struct request_sock_ops
*rsk_prot
= prot
->rsk_prot
;
3032 rsk_prot
->slab_name
= kasprintf(GFP_KERNEL
, "request_sock_%s",
3034 if (!rsk_prot
->slab_name
)
3037 rsk_prot
->slab
= kmem_cache_create(rsk_prot
->slab_name
,
3038 rsk_prot
->obj_size
, 0,
3039 prot
->slab_flags
, NULL
);
3041 if (!rsk_prot
->slab
) {
3042 pr_crit("%s: Can't create request sock SLAB cache!\n",
3049 int proto_register(struct proto
*prot
, int alloc_slab
)
3052 prot
->slab
= kmem_cache_create(prot
->name
, prot
->obj_size
, 0,
3053 SLAB_HWCACHE_ALIGN
| prot
->slab_flags
,
3056 if (prot
->slab
== NULL
) {
3057 pr_crit("%s: Can't create sock SLAB cache!\n",
3062 if (req_prot_init(prot
))
3063 goto out_free_request_sock_slab
;
3065 if (prot
->twsk_prot
!= NULL
) {
3066 prot
->twsk_prot
->twsk_slab_name
= kasprintf(GFP_KERNEL
, "tw_sock_%s", prot
->name
);
3068 if (prot
->twsk_prot
->twsk_slab_name
== NULL
)
3069 goto out_free_request_sock_slab
;
3071 prot
->twsk_prot
->twsk_slab
=
3072 kmem_cache_create(prot
->twsk_prot
->twsk_slab_name
,
3073 prot
->twsk_prot
->twsk_obj_size
,
3077 if (prot
->twsk_prot
->twsk_slab
== NULL
)
3078 goto out_free_timewait_sock_slab_name
;
3082 mutex_lock(&proto_list_mutex
);
3083 list_add(&prot
->node
, &proto_list
);
3084 assign_proto_idx(prot
);
3085 mutex_unlock(&proto_list_mutex
);
3088 out_free_timewait_sock_slab_name
:
3089 kfree(prot
->twsk_prot
->twsk_slab_name
);
3090 out_free_request_sock_slab
:
3091 req_prot_cleanup(prot
->rsk_prot
);
3093 kmem_cache_destroy(prot
->slab
);
3098 EXPORT_SYMBOL(proto_register
);
3100 void proto_unregister(struct proto
*prot
)
3102 mutex_lock(&proto_list_mutex
);
3103 release_proto_idx(prot
);
3104 list_del(&prot
->node
);
3105 mutex_unlock(&proto_list_mutex
);
3107 kmem_cache_destroy(prot
->slab
);
3110 req_prot_cleanup(prot
->rsk_prot
);
3112 if (prot
->twsk_prot
!= NULL
&& prot
->twsk_prot
->twsk_slab
!= NULL
) {
3113 kmem_cache_destroy(prot
->twsk_prot
->twsk_slab
);
3114 kfree(prot
->twsk_prot
->twsk_slab_name
);
3115 prot
->twsk_prot
->twsk_slab
= NULL
;
3118 EXPORT_SYMBOL(proto_unregister
);
3120 #ifdef CONFIG_PROC_FS
3121 static void *proto_seq_start(struct seq_file
*seq
, loff_t
*pos
)
3122 __acquires(proto_list_mutex
)
3124 mutex_lock(&proto_list_mutex
);
3125 return seq_list_start_head(&proto_list
, *pos
);
3128 static void *proto_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
3130 return seq_list_next(v
, &proto_list
, pos
);
3133 static void proto_seq_stop(struct seq_file
*seq
, void *v
)
3134 __releases(proto_list_mutex
)
3136 mutex_unlock(&proto_list_mutex
);
3139 static char proto_method_implemented(const void *method
)
3141 return method
== NULL
? 'n' : 'y';
3143 static long sock_prot_memory_allocated(struct proto
*proto
)
3145 return proto
->memory_allocated
!= NULL
? proto_memory_allocated(proto
) : -1L;
3148 static char *sock_prot_memory_pressure(struct proto
*proto
)
3150 return proto
->memory_pressure
!= NULL
?
3151 proto_memory_pressure(proto
) ? "yes" : "no" : "NI";
3154 static void proto_seq_printf(struct seq_file
*seq
, struct proto
*proto
)
3157 seq_printf(seq
, "%-9s %4u %6d %6ld %-3s %6u %-3s %-10s "
3158 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
3161 sock_prot_inuse_get(seq_file_net(seq
), proto
),
3162 sock_prot_memory_allocated(proto
),
3163 sock_prot_memory_pressure(proto
),
3165 proto
->slab
== NULL
? "no" : "yes",
3166 module_name(proto
->owner
),
3167 proto_method_implemented(proto
->close
),
3168 proto_method_implemented(proto
->connect
),
3169 proto_method_implemented(proto
->disconnect
),
3170 proto_method_implemented(proto
->accept
),
3171 proto_method_implemented(proto
->ioctl
),
3172 proto_method_implemented(proto
->init
),
3173 proto_method_implemented(proto
->destroy
),
3174 proto_method_implemented(proto
->shutdown
),
3175 proto_method_implemented(proto
->setsockopt
),
3176 proto_method_implemented(proto
->getsockopt
),
3177 proto_method_implemented(proto
->sendmsg
),
3178 proto_method_implemented(proto
->recvmsg
),
3179 proto_method_implemented(proto
->sendpage
),
3180 proto_method_implemented(proto
->bind
),
3181 proto_method_implemented(proto
->backlog_rcv
),
3182 proto_method_implemented(proto
->hash
),
3183 proto_method_implemented(proto
->unhash
),
3184 proto_method_implemented(proto
->get_port
),
3185 proto_method_implemented(proto
->enter_memory_pressure
));
3188 static int proto_seq_show(struct seq_file
*seq
, void *v
)
3190 if (v
== &proto_list
)
3191 seq_printf(seq
, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
3200 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
3202 proto_seq_printf(seq
, list_entry(v
, struct proto
, node
));
3206 static const struct seq_operations proto_seq_ops
= {
3207 .start
= proto_seq_start
,
3208 .next
= proto_seq_next
,
3209 .stop
= proto_seq_stop
,
3210 .show
= proto_seq_show
,
3213 static int proto_seq_open(struct inode
*inode
, struct file
*file
)
3215 return seq_open_net(inode
, file
, &proto_seq_ops
,
3216 sizeof(struct seq_net_private
));
3219 static const struct file_operations proto_seq_fops
= {
3220 .owner
= THIS_MODULE
,
3221 .open
= proto_seq_open
,
3223 .llseek
= seq_lseek
,
3224 .release
= seq_release_net
,
3227 static __net_init
int proto_init_net(struct net
*net
)
3229 if (!proc_create("protocols", S_IRUGO
, net
->proc_net
, &proto_seq_fops
))
3235 static __net_exit
void proto_exit_net(struct net
*net
)
3237 remove_proc_entry("protocols", net
->proc_net
);
3241 static __net_initdata
struct pernet_operations proto_net_ops
= {
3242 .init
= proto_init_net
,
3243 .exit
= proto_exit_net
,
3246 static int __init
proto_init(void)
3248 return register_pernet_subsys(&proto_net_ops
);
3251 subsys_initcall(proto_init
);
3253 #endif /* PROC_FS */
3255 #ifdef CONFIG_NET_RX_BUSY_POLL
3256 bool sk_busy_loop_end(void *p
, unsigned long start_time
)
3258 struct sock
*sk
= p
;
3260 return !skb_queue_empty(&sk
->sk_receive_queue
) ||
3261 sk_busy_loop_timeout(sk
, start_time
);
3263 EXPORT_SYMBOL(sk_busy_loop_end
);
3264 #endif /* CONFIG_NET_RX_BUSY_POLL */