sock.h 67.7 KB
Newer Older
Linus Torvalds's avatar
Linus Torvalds committed
1
2
3
4
5
6
7
8
9
/*
 * INET		An implementation of the TCP/IP protocol suite for the LINUX
 *		operating system.  INET is implemented using the  BSD Socket
 *		interface as the means of communication with the user level.
 *
 *		Definitions for the AF_INET socket handler.
 *
 * Version:	@(#)sock.h	1.0.4	05/13/93
 *
10
 * Authors:	Ross Biro
Linus Torvalds's avatar
Linus Torvalds committed
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
 *		Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
 *		Corey Minyard <wf-rch!minyard@relay.EU.net>
 *		Florian La Roche <flla@stud.uni-sb.de>
 *
 * Fixes:
 *		Alan Cox	:	Volatiles in skbuff pointers. See
 *					skbuff comments. May be overdone,
 *					better to prove they can be removed
 *					than the reverse.
 *		Alan Cox	:	Added a zapped field for tcp to note
 *					a socket is reset and must stay shut up
 *		Alan Cox	:	New fields for options
 *	Pauline Middelink	:	identd support
 *		Alan Cox	:	Eliminate low level recv/recvfrom
 *		David S. Miller	:	New socket lookup architecture.
 *              Steve Whitehouse:       Default routines for sock_ops
 *              Arnaldo C. Melo :	removed net_pinfo, tp_pinfo and made
 *              			protinfo be just a void pointer, as the
 *              			protocol specific parts were moved to
 *              			respective headers and ipv4/v6, etc now
 *              			use private slabcaches for its socks
 *              Pedro Hortas	:	New flags field for socket options
 *
 *
 *		This program is free software; you can redistribute it and/or
 *		modify it under the terms of the GNU General Public License
 *		as published by the Free Software Foundation; either version
 *		2 of the License, or (at your option) any later version.
 */
#ifndef _SOCK_H
#define _SOCK_H

43
#include <linux/hardirq.h>
44
#include <linux/kernel.h>
Linus Torvalds's avatar
Linus Torvalds committed
45
#include <linux/list.h>
46
#include <linux/list_nulls.h>
Linus Torvalds's avatar
Linus Torvalds committed
47
48
#include <linux/timer.h>
#include <linux/cache.h>
49
#include <linux/bitops.h>
50
#include <linux/lockdep.h>
Linus Torvalds's avatar
Linus Torvalds committed
51
52
#include <linux/netdevice.h>
#include <linux/skbuff.h>	/* struct sk_buff */
Al Viro's avatar
Al Viro committed
53
#include <linux/mm.h>
Linus Torvalds's avatar
Linus Torvalds committed
54
#include <linux/security.h>
55
#include <linux/slab.h>
56
#include <linux/uaccess.h>
57
#include <linux/page_counter.h>
58
#include <linux/memcontrol.h>
59
#include <linux/static_key.h>
Al Viro's avatar
Al Viro committed
60
#include <linux/sched.h>
61
#include <linux/wait.h>
62
#include <linux/cgroup-defs.h>
63
#include <linux/rbtree.h>
Linus Torvalds's avatar
Linus Torvalds committed
64
#include <linux/filter.h>
65
#include <linux/rculist_nulls.h>
66
#include <linux/poll.h>
Linus Torvalds's avatar
Linus Torvalds committed
67

68
#include <linux/atomic.h>
69
#include <linux/refcount.h>
Linus Torvalds's avatar
Linus Torvalds committed
70
71
#include <net/dst.h>
#include <net/checksum.h>
Eric Dumazet's avatar
Eric Dumazet committed
72
#include <net/tcp_states.h>
73
#include <linux/net_tstamp.h>
74
#include <net/smc.h>
Linus Torvalds's avatar
Linus Torvalds committed
75
76
77
78
79
80
81
82
83
84
85
86
87

/*
 * This structure really needs to be cleaned up.
 * Most of it is for TCP, and not used by any of
 * the other protocols.
 */

/* Define this to get the SOCK_DBG debugging facility. */
#define SOCK_DEBUGGING
#ifdef SOCK_DEBUGGING
#define SOCK_DEBUG(sk, msg...) do { if ((sk) && sock_flag((sk), SOCK_DBG)) \
					printk(KERN_DEBUG msg); } while (0)
#else
88
/* Validate arguments and do nothing */
89
static inline __printf(2, 3)
Eric Dumazet's avatar
Eric Dumazet committed
90
void SOCK_DEBUG(const struct sock *sk, const char *msg, ...)
91
92
{
}
Linus Torvalds's avatar
Linus Torvalds committed
93
94
95
96
97
98
99
100
#endif

/* This is the per-socket lock.  The spinlock provides a synchronization
 * between user contexts and software interrupt processing, whereas the
 * mini-semaphore synchronizes multiple users amongst themselves.
 */
typedef struct {
	spinlock_t		slock;
101
	int			owned;
Linus Torvalds's avatar
Linus Torvalds committed
102
	wait_queue_head_t	wq;
103
104
105
106
107
108
109
110
111
	/*
	 * We express the mutex-alike socket_lock semantics
	 * to the lock validator by explicitly managing
	 * the slock as a lock variant (in addition to
	 * the slock itself):
	 */
#ifdef CONFIG_DEBUG_LOCK_ALLOC
	struct lockdep_map dep_map;
#endif
Linus Torvalds's avatar
Linus Torvalds committed
112
113
114
} socket_lock_t;

struct sock;
115
struct proto;
116
struct net;
Linus Torvalds's avatar
Linus Torvalds committed
117

118
119
120
typedef __u32 __bitwise __portpair;
typedef __u64 __bitwise __addrpair;

Linus Torvalds's avatar
Linus Torvalds committed
121
/**
122
 *	struct sock_common - minimal network layer representation of sockets
123
124
 *	@skc_daddr: Foreign IPv4 addr
 *	@skc_rcv_saddr: Bound local IPv4 addr
Eric Dumazet's avatar
Eric Dumazet committed
125
 *	@skc_hash: hash value used with various protocol lookup tables
126
 *	@skc_u16hashes: two u16 hash values used by UDP lookup tables
127
128
 *	@skc_dport: placeholder for inet_dport/tw_dport
 *	@skc_num: placeholder for inet_num/tw_num
129
130
131
 *	@skc_family: network address family
 *	@skc_state: Connection state
 *	@skc_reuse: %SO_REUSEADDR setting
Tom Herbert's avatar
Tom Herbert committed
132
 *	@skc_reuseport: %SO_REUSEPORT setting
133
134
 *	@skc_bound_dev_if: bound device index if != 0
 *	@skc_bind_node: bind hash linkage for various protocol lookup tables
135
 *	@skc_portaddr_node: second hash linkage for UDP/UDP-Lite protocol
136
 *	@skc_prot: protocol handlers inside a network family
137
 *	@skc_net: reference to the network namespace of this socket
138
139
140
 *	@skc_node: main hash linkage for various protocol lookup tables
 *	@skc_nulls_node: main hash linkage for TCP/UDP/UDP-Lite protocol
 *	@skc_tx_queue_mapping: tx queue number for this connection
141
142
143
 *	@skc_flags: place holder for sk_flags
 *		%SO_LINGER (l_onoff), %SO_BROADCAST, %SO_KEEPALIVE,
 *		%SO_OOBINLINE settings, %SO_TIMESTAMPING settings
144
 *	@skc_incoming_cpu: record/match cpu processing incoming packets
145
 *	@skc_refcnt: reference count
146
147
 *
 *	This is the minimal network layer representation of sockets, the header
148
149
 *	for struct sock and struct inet_timewait_sock.
 */
Linus Torvalds's avatar
Linus Torvalds committed
150
struct sock_common {
151
	/* skc_daddr and skc_rcv_saddr must be grouped on a 8 bytes aligned
Eric Dumazet's avatar
Eric Dumazet committed
152
	 * address on 64bit arches : cf INET_MATCH()
Eric Dumazet's avatar
Eric Dumazet committed
153
	 */
154
	union {
155
		__addrpair	skc_addrpair;
156
157
158
159
160
		struct {
			__be32	skc_daddr;
			__be32	skc_rcv_saddr;
		};
	};
161
162
163
164
	union  {
		unsigned int	skc_hash;
		__u16		skc_u16hashes[2];
	};
165
166
	/* skc_dport && skc_num must be grouped as well */
	union {
167
		__portpair	skc_portpair;
168
169
170
171
172
173
		struct {
			__be16	skc_dport;
			__u16	skc_num;
		};
	};

Eric Dumazet's avatar
Eric Dumazet committed
174
175
	unsigned short		skc_family;
	volatile unsigned char	skc_state;
Tom Herbert's avatar
Tom Herbert committed
176
	unsigned char		skc_reuse:4;
177
178
	unsigned char		skc_reuseport:1;
	unsigned char		skc_ipv6only:1;
179
	unsigned char		skc_net_refcnt:1;
Eric Dumazet's avatar
Eric Dumazet committed
180
	int			skc_bound_dev_if;
181
182
	union {
		struct hlist_node	skc_bind_node;
183
		struct hlist_node	skc_portaddr_node;
184
	};
185
	struct proto		*skc_prot;
186
	possible_net_t		skc_net;
187
188
189
190
191
192

#if IS_ENABLED(CONFIG_IPV6)
	struct in6_addr		skc_v6_daddr;
	struct in6_addr		skc_v6_rcv_saddr;
#endif

Eric Dumazet's avatar
Eric Dumazet committed
193
194
	atomic64_t		skc_cookie;

195
196
197
198
199
200
201
202
203
204
	/* following fields are padding to force
	 * offset(struct sock, sk_refcnt) == 128 on 64bit arches
	 * assuming IPV6 is enabled. We use this padding differently
	 * for different kind of 'sockets'
	 */
	union {
		unsigned long	skc_flags;
		struct sock	*skc_listener; /* request_sock */
		struct inet_timewait_death_row *skc_tw_dr; /* inet_timewait_sock */
	};
205
206
207
208
	/*
	 * fields between dontcopy_begin/dontcopy_end
	 * are not copied in sock_copy()
	 */
209
	/* private: */
210
	int			skc_dontcopy_begin[0];
211
	/* public: */
212
213
214
215
216
	union {
		struct hlist_node	skc_node;
		struct hlist_nulls_node skc_nulls_node;
	};
	int			skc_tx_queue_mapping;
217
218
219
	union {
		int		skc_incoming_cpu;
		u32		skc_rcv_wnd;
220
		u32		skc_tw_rcv_nxt; /* struct tcp_timewait_sock  */
221
	};
222

223
	refcount_t		skc_refcnt;
224
	/* private: */
225
	int                     skc_dontcopy_end[0];
226
227
228
	union {
		u32		skc_rxhash;
		u32		skc_window_clamp;
229
		u32		skc_tw_snd_nxt; /* struct tcp_timewait_sock */
230
	};
231
	/* public: */
Linus Torvalds's avatar
Linus Torvalds committed
232
233
234
235
};

/**
  *	struct sock - network layer representation of sockets
236
  *	@__sk_common: shared layout with inet_timewait_sock
237
238
239
  *	@sk_shutdown: mask of %SEND_SHUTDOWN and/or %RCV_SHUTDOWN
  *	@sk_userlocks: %SO_SNDBUF and %SO_RCVBUF settings
  *	@sk_lock:	synchronizer
240
  *	@sk_kern_sock: True if sock is using kernel lock classes
241
  *	@sk_rcvbuf: size of receive buffer in bytes
242
  *	@sk_wq: sock wait queue and async head
Shawn Bohrer's avatar
Shawn Bohrer committed
243
  *	@sk_rx_dst: receive input route used by early demux
244
  *	@sk_dst_cache: destination cache
245
  *	@sk_dst_pending_confirm: need to confirm neighbour
246
247
248
  *	@sk_policy: flow policy
  *	@sk_receive_queue: incoming packets
  *	@sk_wmem_alloc: transmit queue bytes committed
249
  *	@sk_tsq_flags: TCP Small Queues flags
250
251
252
253
  *	@sk_write_queue: Packet sending queue
  *	@sk_omem_alloc: "o" is "option" or "other"
  *	@sk_wmem_queued: persistent queue size
  *	@sk_forward_alloc: space allocated forward
254
  *	@sk_napi_id: id of the last napi context to receive data for sk
255
  *	@sk_ll_usec: usecs to busypoll when there is no data
256
  *	@sk_allocation: allocation mode
257
  *	@sk_pacing_rate: Pacing rate (if supported by transport/packet scheduler)
258
  *	@sk_pacing_status: Pacing status (requested, handled by sch_fq)
259
  *	@sk_max_pacing_rate: Maximum pacing rate (%SO_MAX_PACING_RATE)
260
  *	@sk_sndbuf: size of send buffer in bytes
261
  *	@__sk_flags_offset: empty field used to determine location of bitfield
262
  *	@sk_padding: unused element for alignment
263
264
  *	@sk_no_check_tx: %SO_NO_CHECK setting, set checksum in TX packets
  *	@sk_no_check_rx: allow zero checksum in RX packets
265
  *	@sk_route_caps: route capabilities (e.g. %NETIF_F_TSO)
Eric Dumazet's avatar
Eric Dumazet committed
266
  *	@sk_route_nocaps: forbidden route capabilities (e.g NETIF_F_GSO_MASK)
267
  *	@sk_gso_type: GSO type (e.g. %SKB_GSO_TCPV4)
268
  *	@sk_gso_max_size: Maximum GSO segment size to build
269
  *	@sk_gso_max_segs: Maximum number of GSO segments
270
  *	@sk_pacing_shift: scaling factor for TCP Small Queues
271
272
273
274
  *	@sk_lingertime: %SO_LINGER l_linger setting
  *	@sk_backlog: always used with the per-socket spinlock held
  *	@sk_callback_lock: used with the callbacks in the end of this struct
  *	@sk_error_queue: rarely used
Wang Chen's avatar
Wang Chen committed
275
276
  *	@sk_prot_creator: sk_prot of original sock creator (see ipv6_setsockopt,
  *			  IPV6_ADDRFORM for instance)
277
  *	@sk_err: last error
Wang Chen's avatar
Wang Chen committed
278
279
  *	@sk_err_soft: errors that don't cause failure but are the cause of a
  *		      persistent failure not just 'timed out'
Eric Dumazet's avatar
Eric Dumazet committed
280
  *	@sk_drops: raw/udp drops counter
281
282
  *	@sk_ack_backlog: current listen backlog
  *	@sk_max_ack_backlog: listen backlog set in listen()
283
  *	@sk_uid: user id of owner
284
285
286
  *	@sk_priority: %SO_PRIORITY setting
  *	@sk_type: socket type (%SOCK_STREAM, etc)
  *	@sk_protocol: which protocol this socket belongs in this network family
287
288
  *	@sk_peer_pid: &struct pid for this socket's peer
  *	@sk_peer_cred: %SO_PEERCRED setting
289
290
291
  *	@sk_rcvlowat: %SO_RCVLOWAT setting
  *	@sk_rcvtimeo: %SO_RCVTIMEO setting
  *	@sk_sndtimeo: %SO_SNDTIMEO setting
292
  *	@sk_txhash: computed flow hash for use on transmit
293
294
295
  *	@sk_filter: socket filtering instructions
  *	@sk_timer: sock cleanup timer
  *	@sk_stamp: time stamp of last packet received
296
  *	@sk_tsflags: SO_TIMESTAMPING socket options
297
  *	@sk_tskey: counter to disambiguate concurrent tstamp requests
Willem de Bruijn's avatar
Willem de Bruijn committed
298
  *	@sk_zckey: counter to order MSG_ZEROCOPY notifications
299
300
  *	@sk_socket: Identd and reporting IO signals
  *	@sk_user_data: RPC layer private data
301
  *	@sk_frag: cached page frag
302
  *	@sk_peek_off: current peek_offset value
303
  *	@sk_send_head: front of stuff to transmit
304
  *	@sk_security: used by security modules
305
  *	@sk_mark: generic packet mark
306
  *	@sk_cgrp_data: cgroup data for this cgroup
307
  *	@sk_memcg: this socket's memory cgroup association
308
309
310
311
312
313
314
  *	@sk_write_pending: a write to stream socket waits to start
  *	@sk_state_change: callback to indicate change in the state of the sock
  *	@sk_data_ready: callback to indicate there is data to be processed
  *	@sk_write_space: callback to indicate there is bf sending space available
  *	@sk_error_report: callback to indicate errors (e.g. %MSG_ERRQUEUE)
  *	@sk_backlog_rcv: callback to process the backlog
  *	@sk_destruct: called at sock freeing time, i.e. when all refcnt == 0
315
  *	@sk_reuseport_cb: reuseport group container
316
317
  *	@sk_rcu: used during RCU grace period
  */
Linus Torvalds's avatar
Linus Torvalds committed
318
319
struct sock {
	/*
320
	 * Now struct inet_timewait_sock also uses sock_common, so please just
Linus Torvalds's avatar
Linus Torvalds committed
321
322
323
	 * don't add nothing before this first member (__sk_common) --acme
	 */
	struct sock_common	__sk_common;
Eric Dumazet's avatar
Eric Dumazet committed
324
325
326
#define sk_node			__sk_common.skc_node
#define sk_nulls_node		__sk_common.skc_nulls_node
#define sk_refcnt		__sk_common.skc_refcnt
327
#define sk_tx_queue_mapping	__sk_common.skc_tx_queue_mapping
Eric Dumazet's avatar
Eric Dumazet committed
328

329
330
#define sk_dontcopy_begin	__sk_common.skc_dontcopy_begin
#define sk_dontcopy_end		__sk_common.skc_dontcopy_end
Eric Dumazet's avatar
Eric Dumazet committed
331
#define sk_hash			__sk_common.skc_hash
Eric Dumazet's avatar
Eric Dumazet committed
332
#define sk_portpair		__sk_common.skc_portpair
Eric Dumazet's avatar
Eric Dumazet committed
333
334
#define sk_num			__sk_common.skc_num
#define sk_dport		__sk_common.skc_dport
Eric Dumazet's avatar
Eric Dumazet committed
335
336
337
#define sk_addrpair		__sk_common.skc_addrpair
#define sk_daddr		__sk_common.skc_daddr
#define sk_rcv_saddr		__sk_common.skc_rcv_saddr
Linus Torvalds's avatar
Linus Torvalds committed
338
339
340
#define sk_family		__sk_common.skc_family
#define sk_state		__sk_common.skc_state
#define sk_reuse		__sk_common.skc_reuse
Tom Herbert's avatar
Tom Herbert committed
341
#define sk_reuseport		__sk_common.skc_reuseport
342
#define sk_ipv6only		__sk_common.skc_ipv6only
343
#define sk_net_refcnt		__sk_common.skc_net_refcnt
Linus Torvalds's avatar
Linus Torvalds committed
344
345
#define sk_bound_dev_if		__sk_common.skc_bound_dev_if
#define sk_bind_node		__sk_common.skc_bind_node
346
#define sk_prot			__sk_common.skc_prot
347
#define sk_net			__sk_common.skc_net
348
349
#define sk_v6_daddr		__sk_common.skc_v6_daddr
#define sk_v6_rcv_saddr	__sk_common.skc_v6_rcv_saddr
Eric Dumazet's avatar
Eric Dumazet committed
350
#define sk_cookie		__sk_common.skc_cookie
351
#define sk_incoming_cpu		__sk_common.skc_incoming_cpu
352
#define sk_flags		__sk_common.skc_flags
353
#define sk_rxhash		__sk_common.skc_rxhash
354

Linus Torvalds's avatar
Linus Torvalds committed
355
	socket_lock_t		sk_lock;
356
357
358
	atomic_t		sk_drops;
	int			sk_rcvlowat;
	struct sk_buff_head	sk_error_queue;
Eric Dumazet's avatar
Eric Dumazet committed
359
	struct sk_buff_head	sk_receive_queue;
360
361
362
363
	/*
	 * The backlog queue is special, it is always used with
	 * the per-socket spinlock held and requires low latency
	 * access. Therefore we special case it's implementation.
Eric Dumazet's avatar
Eric Dumazet committed
364
365
366
	 * Note : rmem_alloc is in this structure to fill a hole
	 * on 64bit arches, not because its logically part of
	 * backlog.
367
368
	 */
	struct {
Eric Dumazet's avatar
Eric Dumazet committed
369
370
371
372
		atomic_t	rmem_alloc;
		int		len;
		struct sk_buff	*head;
		struct sk_buff	*tail;
373
	} sk_backlog;
Eric Dumazet's avatar
Eric Dumazet committed
374
#define sk_rmem_alloc sk_backlog.rmem_alloc
Eric Dumazet's avatar
Eric Dumazet committed
375

376
	int			sk_forward_alloc;
377
#ifdef CONFIG_NET_RX_BUSY_POLL
378
	unsigned int		sk_ll_usec;
379
380
	/* ===== mostly read cache line ===== */
	unsigned int		sk_napi_id;
Eric Dumazet's avatar
Eric Dumazet committed
381
382
383
384
#endif
	int			sk_rcvbuf;

	struct sk_filter __rcu	*sk_filter;
385
386
387
388
	union {
		struct socket_wq __rcu	*sk_wq;
		struct socket_wq	*sk_wq_raw;
	};
389
#ifdef CONFIG_XFRM
390
	struct xfrm_policy __rcu *sk_policy[2];
391
#endif
Eric Dumazet's avatar
Eric Dumazet committed
392
	struct dst_entry	*sk_rx_dst;
393
	struct dst_entry __rcu	*sk_dst_cache;
Linus Torvalds's avatar
Linus Torvalds committed
394
	atomic_t		sk_omem_alloc;
395
	int			sk_sndbuf;
396
397
398

	/* ===== cache line for TX ===== */
	int			sk_wmem_queued;
399
	refcount_t		sk_wmem_alloc;
400
	unsigned long		sk_tsq_flags;
401
402
403
404
	union {
		struct sk_buff	*sk_send_head;
		struct rb_root	tcp_rtx_queue;
	};
Linus Torvalds's avatar
Linus Torvalds committed
405
	struct sk_buff_head	sk_write_queue;
406
407
	__s32			sk_peek_off;
	int			sk_write_pending;
408
	__u32			sk_dst_pending_confirm;
409
	u32			sk_pacing_status; /* see enum sk_pacing */
410
411
412
413
414
415
416
417
418
419
420
421
422
	long			sk_sndtimeo;
	struct timer_list	sk_timer;
	__u32			sk_priority;
	__u32			sk_mark;
	u32			sk_pacing_rate; /* bytes per second */
	u32			sk_max_pacing_rate;
	struct page_frag	sk_frag;
	netdev_features_t	sk_route_caps;
	netdev_features_t	sk_route_nocaps;
	int			sk_gso_type;
	unsigned int		sk_gso_max_size;
	gfp_t			sk_allocation;
	__u32			sk_txhash;
423
424
425
426
427

	/*
	 * Because of non atomicity rules, all
	 * changes are protected by socket lock.
	 */
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
	unsigned int		__sk_flags_offset[0];
#ifdef __BIG_ENDIAN_BITFIELD
#define SK_FL_PROTO_SHIFT  16
#define SK_FL_PROTO_MASK   0x00ff0000

#define SK_FL_TYPE_SHIFT   0
#define SK_FL_TYPE_MASK    0x0000ffff
#else
#define SK_FL_PROTO_SHIFT  8
#define SK_FL_PROTO_MASK   0x0000ff00

#define SK_FL_TYPE_SHIFT   16
#define SK_FL_TYPE_MASK    0xffff0000
#endif

443
444
	unsigned int		sk_padding : 1,
				sk_kern_sock : 1,
445
446
				sk_no_check_tx : 1,
				sk_no_check_rx : 1,
Eric Dumazet's avatar
Eric Dumazet committed
447
448
449
				sk_userlocks : 4,
				sk_protocol  : 8,
				sk_type      : 16;
450
#define SK_PROTOCOL_MAX U8_MAX
451
	u16			sk_gso_max_segs;
452
	u8			sk_pacing_shift;
Linus Torvalds's avatar
Linus Torvalds committed
453
	unsigned long	        sk_lingertime;
454
	struct proto		*sk_prot_creator;
Linus Torvalds's avatar
Linus Torvalds committed
455
456
457
	rwlock_t		sk_callback_lock;
	int			sk_err,
				sk_err_soft;
458
459
	u32			sk_ack_backlog;
	u32			sk_max_ack_backlog;
460
	kuid_t			sk_uid;
461
462
	struct pid		*sk_peer_pid;
	const struct cred	*sk_peer_cred;
Linus Torvalds's avatar
Linus Torvalds committed
463
	long			sk_rcvtimeo;
464
	ktime_t			sk_stamp;
465
	u16			sk_tsflags;
466
	u8			sk_shutdown;
467
	u32			sk_tskey;
Willem de Bruijn's avatar
Willem de Bruijn committed
468
	atomic_t		sk_zckey;
Linus Torvalds's avatar
Linus Torvalds committed
469
470
	struct socket		*sk_socket;
	void			*sk_user_data;
Alexey Dobriyan's avatar
Alexey Dobriyan committed
471
#ifdef CONFIG_SECURITY
Linus Torvalds's avatar
Linus Torvalds committed
472
	void			*sk_security;
Alexey Dobriyan's avatar
Alexey Dobriyan committed
473
#endif
474
	struct sock_cgroup_data	sk_cgrp_data;
475
	struct mem_cgroup	*sk_memcg;
Linus Torvalds's avatar
Linus Torvalds committed
476
	void			(*sk_state_change)(struct sock *sk);
477
	void			(*sk_data_ready)(struct sock *sk);
Linus Torvalds's avatar
Linus Torvalds committed
478
479
	void			(*sk_write_space)(struct sock *sk);
	void			(*sk_error_report)(struct sock *sk);
Eric Dumazet's avatar
Eric Dumazet committed
480
481
	int			(*sk_backlog_rcv)(struct sock *sk,
						  struct sk_buff *skb);
Linus Torvalds's avatar
Linus Torvalds committed
482
	void                    (*sk_destruct)(struct sock *sk);
483
	struct sock_reuseport __rcu	*sk_reuseport_cb;
484
	struct rcu_head		sk_rcu;
Linus Torvalds's avatar
Linus Torvalds committed
485
486
};

487
488
489
490
491
492
enum sk_pacing {
	SK_PACING_NONE		= 0,
	SK_PACING_NEEDED	= 1,
	SK_PACING_FQ		= 2,
};

493
494
495
496
497
#define __sk_user_data(sk) ((*((void __rcu **)&(sk)->sk_user_data)))

#define rcu_dereference_sk_user_data(sk)	rcu_dereference(__sk_user_data((sk)))
#define rcu_assign_sk_user_data(sk, ptr)	rcu_assign_pointer(__sk_user_data((sk)), ptr)

498
499
500
501
502
503
504
505
506
507
508
/*
 * SK_CAN_REUSE and SK_NO_REUSE on a socket mean that the socket is OK
 * or not whether his port will be reused by someone else. SK_FORCE_REUSE
 * on a socket means that the socket will reuse everybody else's port
 * without looking at the other's sk_reuse value.
 */

#define SK_NO_REUSE	0
#define SK_CAN_REUSE	1
#define SK_FORCE_REUSE	2

509
510
int sk_set_peek_off(struct sock *sk, int val);

511
512
static inline int sk_peek_offset(struct sock *sk, int flags)
{
513
	if (unlikely(flags & MSG_PEEK)) {
514
		return READ_ONCE(sk->sk_peek_off);
515
516
517
	}

	return 0;
518
519
520
521
}

static inline void sk_peek_offset_bwd(struct sock *sk, int val)
{
522
523
524
525
526
	s32 off = READ_ONCE(sk->sk_peek_off);

	if (unlikely(off >= 0)) {
		off = max_t(s32, off - val, 0);
		WRITE_ONCE(sk->sk_peek_off, off);
527
528
529
530
531
	}
}

static inline void sk_peek_offset_fwd(struct sock *sk, int val)
{
532
	sk_peek_offset_bwd(sk, -val);
533
534
}

Linus Torvalds's avatar
Linus Torvalds committed
535
536
537
/*
 * Hashed lists helper routines
 */
Li Zefan's avatar
Li Zefan committed
538
539
540
541
542
static inline struct sock *sk_entry(const struct hlist_node *node)
{
	return hlist_entry(node, struct sock, sk_node);
}

543
static inline struct sock *__sk_head(const struct hlist_head *head)
Linus Torvalds's avatar
Linus Torvalds committed
544
545
546
547
{
	return hlist_entry(head->first, struct sock, sk_node);
}

548
static inline struct sock *sk_head(const struct hlist_head *head)
Linus Torvalds's avatar
Linus Torvalds committed
549
550
551
552
{
	return hlist_empty(head) ? NULL : __sk_head(head);
}

553
554
555
556
557
558
559
560
561
562
static inline struct sock *__sk_nulls_head(const struct hlist_nulls_head *head)
{
	return hlist_nulls_entry(head->first, struct sock, sk_nulls_node);
}

static inline struct sock *sk_nulls_head(const struct hlist_nulls_head *head)
{
	return hlist_nulls_empty(head) ? NULL : __sk_nulls_head(head);
}

563
static inline struct sock *sk_next(const struct sock *sk)
Linus Torvalds's avatar
Linus Torvalds committed
564
{
Geliang Tang's avatar
Geliang Tang committed
565
	return hlist_entry_safe(sk->sk_node.next, struct sock, sk_node);
Linus Torvalds's avatar
Linus Torvalds committed
566
567
}

568
569
570
571
572
573
574
575
static inline struct sock *sk_nulls_next(const struct sock *sk)
{
	return (!is_a_nulls(sk->sk_nulls_node.next)) ?
		hlist_nulls_entry(sk->sk_nulls_node.next,
				  struct sock, sk_nulls_node) :
		NULL;
}

Eric Dumazet's avatar
Eric Dumazet committed
576
static inline bool sk_unhashed(const struct sock *sk)
Linus Torvalds's avatar
Linus Torvalds committed
577
578
579
580
{
	return hlist_unhashed(&sk->sk_node);
}

Eric Dumazet's avatar
Eric Dumazet committed
581
static inline bool sk_hashed(const struct sock *sk)
Linus Torvalds's avatar
Linus Torvalds committed
582
{
Akinobu Mita's avatar
Akinobu Mita committed
583
	return !sk_unhashed(sk);
Linus Torvalds's avatar
Linus Torvalds committed
584
585
}

Eric Dumazet's avatar
Eric Dumazet committed
586
static inline void sk_node_init(struct hlist_node *node)
Linus Torvalds's avatar
Linus Torvalds committed
587
588
589
590
{
	node->pprev = NULL;
}

Eric Dumazet's avatar
Eric Dumazet committed
591
static inline void sk_nulls_node_init(struct hlist_nulls_node *node)
592
593
594
595
{
	node->pprev = NULL;
}

Eric Dumazet's avatar
Eric Dumazet committed
596
static inline void __sk_del_node(struct sock *sk)
Linus Torvalds's avatar
Linus Torvalds committed
597
598
599
600
{
	__hlist_del(&sk->sk_node);
}

601
/* NB: equivalent to hlist_del_init_rcu */
Eric Dumazet's avatar
Eric Dumazet committed
602
static inline bool __sk_del_node_init(struct sock *sk)
Linus Torvalds's avatar
Linus Torvalds committed
603
604
605
606
{
	if (sk_hashed(sk)) {
		__sk_del_node(sk);
		sk_node_init(&sk->sk_node);
Eric Dumazet's avatar
Eric Dumazet committed
607
		return true;
Linus Torvalds's avatar
Linus Torvalds committed
608
	}
Eric Dumazet's avatar
Eric Dumazet committed
609
	return false;
Linus Torvalds's avatar
Linus Torvalds committed
610
611
612
613
614
615
616
617
}

/* Grab socket reference count. This operation is valid only
   when sk is ALREADY grabbed f.e. it is found in hash table
   or a list and the lookup is made under lock preventing hash table
   modifications.
 */

618
static __always_inline void sock_hold(struct sock *sk)
Linus Torvalds's avatar
Linus Torvalds committed
619
{
620
	refcount_inc(&sk->sk_refcnt);
Linus Torvalds's avatar
Linus Torvalds committed
621
622
623
624
625
}

/* Ungrab socket in the context, which assumes that socket refcnt
   cannot hit zero, f.e. it is true in context of any socketcall.
 */
626
static __always_inline void __sock_put(struct sock *sk)
Linus Torvalds's avatar
Linus Torvalds committed
627
{
628
	refcount_dec(&sk->sk_refcnt);
Linus Torvalds's avatar
Linus Torvalds committed
629
630
}

Eric Dumazet's avatar
Eric Dumazet committed
631
static inline bool sk_del_node_init(struct sock *sk)
Linus Torvalds's avatar
Linus Torvalds committed
632
{
Eric Dumazet's avatar
Eric Dumazet committed
633
	bool rc = __sk_del_node_init(sk);
Linus Torvalds's avatar
Linus Torvalds committed
634
635
636

	if (rc) {
		/* paranoid for a while -acme */
637
		WARN_ON(refcount_read(&sk->sk_refcnt) == 1);
Linus Torvalds's avatar
Linus Torvalds committed
638
639
640
641
		__sock_put(sk);
	}
	return rc;
}
642
#define sk_del_node_init_rcu(sk)	sk_del_node_init(sk)
Linus Torvalds's avatar
Linus Torvalds committed
643

Eric Dumazet's avatar
Eric Dumazet committed
644
static inline bool __sk_nulls_del_node_init_rcu(struct sock *sk)
645
646
{
	if (sk_hashed(sk)) {
647
		hlist_nulls_del_init_rcu(&sk->sk_nulls_node);
Eric Dumazet's avatar
Eric Dumazet committed
648
		return true;
649
	}
Eric Dumazet's avatar
Eric Dumazet committed
650
	return false;
651
652
}

Eric Dumazet's avatar
Eric Dumazet committed
653
static inline bool sk_nulls_del_node_init_rcu(struct sock *sk)
654
{
Eric Dumazet's avatar
Eric Dumazet committed
655
	bool rc = __sk_nulls_del_node_init_rcu(sk);
656
657
658

	if (rc) {
		/* paranoid for a while -acme */
659
		WARN_ON(refcount_read(&sk->sk_refcnt) == 1);
660
661
662
663
664
		__sock_put(sk);
	}
	return rc;
}

Eric Dumazet's avatar
Eric Dumazet committed
665
static inline void __sk_add_node(struct sock *sk, struct hlist_head *list)
Linus Torvalds's avatar
Linus Torvalds committed
666
667
668
669
{
	hlist_add_head(&sk->sk_node, list);
}

Eric Dumazet's avatar
Eric Dumazet committed
670
static inline void sk_add_node(struct sock *sk, struct hlist_head *list)
Linus Torvalds's avatar
Linus Torvalds committed
671
672
673
674
675
{
	sock_hold(sk);
	__sk_add_node(sk, list);
}

Eric Dumazet's avatar
Eric Dumazet committed
676
static inline void sk_add_node_rcu(struct sock *sk, struct hlist_head *list)
677
678
{
	sock_hold(sk);
679
680
681
682
683
	if (IS_ENABLED(CONFIG_IPV6) && sk->sk_reuseport &&
	    sk->sk_family == AF_INET6)
		hlist_add_tail_rcu(&sk->sk_node, list);
	else
		hlist_add_head_rcu(&sk->sk_node, list);
684
685
}

Eric Dumazet's avatar
Eric Dumazet committed
686
static inline void __sk_nulls_add_node_rcu(struct sock *sk, struct hlist_nulls_head *list)
687
{
688
689
690
691
692
	if (IS_ENABLED(CONFIG_IPV6) && sk->sk_reuseport &&
	    sk->sk_family == AF_INET6)
		hlist_nulls_add_tail_rcu(&sk->sk_nulls_node, list);
	else
		hlist_nulls_add_head_rcu(&sk->sk_nulls_node, list);
693
694
}

Eric Dumazet's avatar
Eric Dumazet committed
695
static inline void sk_nulls_add_node_rcu(struct sock *sk, struct hlist_nulls_head *list)
696
697
{
	sock_hold(sk);
698
	__sk_nulls_add_node_rcu(sk, list);
699
700
}

Eric Dumazet's avatar
Eric Dumazet committed
701
static inline void __sk_del_bind_node(struct sock *sk)
Linus Torvalds's avatar
Linus Torvalds committed
702
703
704
705
{
	__hlist_del(&sk->sk_bind_node);
}

Eric Dumazet's avatar
Eric Dumazet committed
706
static inline void sk_add_bind_node(struct sock *sk,
Linus Torvalds's avatar
Linus Torvalds committed
707
708
709
710
711
					struct hlist_head *list)
{
	hlist_add_head(&sk->sk_bind_node, list);
}

712
713
714
715
#define sk_for_each(__sk, list) \
	hlist_for_each_entry(__sk, list, sk_node)
#define sk_for_each_rcu(__sk, list) \
	hlist_for_each_entry_rcu(__sk, list, sk_node)
716
717
718
719
#define sk_nulls_for_each(__sk, node, list) \
	hlist_nulls_for_each_entry(__sk, node, list, sk_nulls_node)
#define sk_nulls_for_each_rcu(__sk, node, list) \
	hlist_nulls_for_each_entry_rcu(__sk, node, list, sk_nulls_node)
720
721
#define sk_for_each_from(__sk) \
	hlist_for_each_entry_from(__sk, sk_node)
722
723
724
#define sk_nulls_for_each_from(__sk, node) \
	if (__sk && ({ node = &(__sk)->sk_nulls_node; 1; })) \
		hlist_nulls_for_each_entry_from(__sk, node, sk_nulls_node)
725
726
727
728
#define sk_for_each_safe(__sk, tmp, list) \
	hlist_for_each_entry_safe(__sk, tmp, list, sk_node)
#define sk_for_each_bound(__sk, list) \
	hlist_for_each_entry(__sk, list, sk_bind_node)
Linus Torvalds's avatar
Linus Torvalds committed
729

730
/**
731
 * sk_for_each_entry_offset_rcu - iterate over a list at a given struct offset
732
733
734
735
736
737
 * @tpos:	the type * to use as a loop cursor.
 * @pos:	the &struct hlist_node to use as a loop cursor.
 * @head:	the head for your list.
 * @offset:	offset of hlist_node within the struct.
 *
 */
738
#define sk_for_each_entry_offset_rcu(tpos, pos, head, offset)		       \
739
	for (pos = rcu_dereference(hlist_first_rcu(head));		       \
740
	     pos != NULL &&						       \
741
		({ tpos = (typeof(*tpos) *)((void *)pos - offset); 1;});       \
742
	     pos = rcu_dereference(hlist_next_rcu(pos)))
743

744
745
746
747
748
749
750
751
752
static inline struct user_namespace *sk_user_ns(struct sock *sk)
{
	/* Careful only use this in a context where these parameters
	 * can not change and must all be valid, such as recvmsg from
	 * userspace.
	 */
	return sk->sk_socket->file->f_cred->user_ns;
}

Linus Torvalds's avatar
Linus Torvalds committed
753
754
755
756
757
758
759
760
761
762
763
764
765
766
/* Sock flags */
enum sock_flags {
	SOCK_DEAD,
	SOCK_DONE,
	SOCK_URGINLINE,
	SOCK_KEEPOPEN,
	SOCK_LINGER,
	SOCK_DESTROY,
	SOCK_BROADCAST,
	SOCK_TIMESTAMP,
	SOCK_ZAPPED,
	SOCK_USE_WRITE_QUEUE, /* whether to call sk->sk_write_space in sock_wfree */
	SOCK_DBG, /* %SO_DEBUG setting */
	SOCK_RCVTSTAMP, /* %SO_TIMESTAMP setting */
767
	SOCK_RCVTSTAMPNS, /* %SO_TIMESTAMPNS setting */
Linus Torvalds's avatar
Linus Torvalds committed
768
769
	SOCK_LOCALROUTE, /* route locally only, %SO_DONTROUTE setting */
	SOCK_QUEUE_SHRUNK, /* write queue has been shrunk recently */
770
	SOCK_MEMALLOC, /* VM depends on this socket for swapping */
771
	SOCK_TIMESTAMPING_RX_SOFTWARE,  /* %SOF_TIMESTAMPING_RX_SOFTWARE */
Eric Dumazet's avatar
Eric Dumazet committed
772
	SOCK_FASYNC, /* fasync() active */
773
	SOCK_RXQ_OVFL,
774
	SOCK_ZEROCOPY, /* buffers from userspace */
775
	SOCK_WIFI_STATUS, /* push wifi status to userspace */
776
777
778
779
	SOCK_NOFCS, /* Tell NIC not to do the Ethernet FCS.
		     * Will use last 4 bytes of packet sent from
		     * user-space instead.
		     */
780
	SOCK_FILTER_LOCKED, /* Filter cannot be changed anymore */
781
	SOCK_SELECT_ERR_QUEUE, /* Wake select on error queue */
782
	SOCK_RCU_FREE, /* wait rcu grace period in sk_destruct() */
Linus Torvalds's avatar
Linus Torvalds committed
783
784
};

785
786
#define SK_FLAGS_TIMESTAMP ((1UL << SOCK_TIMESTAMP) | (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE))

Ralf Baechle's avatar
Ralf Baechle committed
787
788
789
790
791
static inline void sock_copy_flags(struct sock *nsk, struct sock *osk)
{
	nsk->sk_flags = osk->sk_flags;
}

Linus Torvalds's avatar
Linus Torvalds committed
792
793
794
795
796
797
798
799
800
801
static inline void sock_set_flag(struct sock *sk, enum sock_flags flag)
{
	__set_bit(flag, &sk->sk_flags);
}

static inline void sock_reset_flag(struct sock *sk, enum sock_flags flag)
{
	__clear_bit(flag, &sk->sk_flags);
}

Eric Dumazet's avatar
Eric Dumazet committed
802
static inline bool sock_flag(const struct sock *sk, enum sock_flags flag)
Linus Torvalds's avatar
Linus Torvalds committed
803
804
805
806
{
	return test_bit(flag, &sk->sk_flags);
}

807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
#ifdef CONFIG_NET
extern struct static_key memalloc_socks;
static inline int sk_memalloc_socks(void)
{
	return static_key_false(&memalloc_socks);
}
#else

static inline int sk_memalloc_socks(void)
{
	return 0;
}

#endif

822
static inline gfp_t sk_gfp_mask(const struct sock *sk, gfp_t gfp_mask)
823
{
824
	return gfp_mask | (sk->sk_allocation & __GFP_MEMALLOC);
825
826
}

Linus Torvalds's avatar
Linus Torvalds committed
827
828
829
830
831
832
833
834
835
836
static inline void sk_acceptq_removed(struct sock *sk)
{
	sk->sk_ack_backlog--;
}

static inline void sk_acceptq_added(struct sock *sk)
{
	sk->sk_ack_backlog++;
}

Eric Dumazet's avatar
Eric Dumazet committed
837
static inline bool sk_acceptq_is_full(const struct sock *sk)
Linus Torvalds's avatar
Linus Torvalds committed
838
{
839
	return sk->sk_ack_backlog > sk->sk_max_ack_backlog;
Linus Torvalds's avatar
Linus Torvalds committed
840
841
842
843
844
}

/*
 * Compute minimal free write space needed to queue new packets.
 */
Eric Dumazet's avatar
Eric Dumazet committed
845
static inline int sk_stream_min_wspace(const struct sock *sk)
Linus Torvalds's avatar
Linus Torvalds committed
846
{
847
	return sk->sk_wmem_queued >> 1;
Linus Torvalds's avatar
Linus Torvalds committed
848
849
}

Eric Dumazet's avatar
Eric Dumazet committed
850
static inline int sk_stream_wspace(const struct sock *sk)
Linus Torvalds's avatar
Linus Torvalds committed
851
852
853
854
{
	return sk->sk_sndbuf - sk->sk_wmem_queued;
}

855
void sk_stream_write_space(struct sock *sk);
Linus Torvalds's avatar
Linus Torvalds committed
856

Zhu Yi's avatar
Zhu Yi committed
857
/* OOB backlog add */
Zhu Yi's avatar
Zhu Yi committed
858
static inline void __sk_add_backlog(struct sock *sk, struct sk_buff *skb)
859
{
Eric Dumazet's avatar
Eric Dumazet committed
860
	/* dont let skb dst not refcounted, we are going to leave rcu lock */
861
	skb_dst_force(skb);
Eric Dumazet's avatar
Eric Dumazet committed
862
863
864
865

	if (!sk->sk_backlog.tail)
		sk->sk_backlog.head = skb;
	else
866
		sk->sk_backlog.tail->next = skb;
Eric Dumazet's avatar
Eric Dumazet committed
867
868

	sk->sk_backlog.tail = skb;
869
870
	skb->next = NULL;
}
Linus Torvalds's avatar
Linus Torvalds committed
871

872
873
/*
 * Take into account size of receive queue and backlog queue
Eric Dumazet's avatar
Eric Dumazet committed
874
875
 * Do not take into account this skb truesize,
 * to allow even a single big packet to come.
876
 */
877
static inline bool sk_rcvqueues_full(const struct sock *sk, unsigned int limit)
878
879
880
{
	unsigned int qsize = sk->sk_backlog.len + atomic_read(&sk->sk_rmem_alloc);

881
	return qsize > limit;
882
883
}

Zhu Yi's avatar
Zhu Yi committed
884
/* The per-socket spinlock must be held here. */
885
886
static inline __must_check int sk_add_backlog(struct sock *sk, struct sk_buff *skb,
					      unsigned int limit)
Zhu Yi's avatar
Zhu Yi committed
887
{
888
	if (sk_rcvqueues_full(sk, limit))
Zhu Yi's avatar
Zhu Yi committed
889
890
		return -ENOBUFS;

891
892
893
894
895
896
897
898
	/*
	 * If the skb was allocated from pfmemalloc reserves, only
	 * allow SOCK_MEMALLOC sockets to use it as this socket is
	 * helping free memory
	 */
	if (skb_pfmemalloc(skb) && !sock_flag(sk, SOCK_MEMALLOC))
		return -ENOMEM;

Zhu Yi's avatar
Zhu Yi committed
899
	__sk_add_backlog(sk, skb);
Zhu Yi's avatar
Zhu Yi committed
900
901
902
903
	sk->sk_backlog.len += skb->truesize;
	return 0;
}

904
int __sk_backlog_rcv(struct sock *sk, struct sk_buff *skb);
905

906
907
static inline int sk_backlog_rcv(struct sock *sk, struct sk_buff *skb)
{
908
909
910
	if (sk_memalloc_socks() && skb_pfmemalloc(skb))
		return __sk_backlog_rcv(sk, skb);

911
912
913
	return sk->sk_backlog_rcv(sk, skb);
}

Eric Dumazet's avatar
Eric Dumazet committed
914
915
static inline void sk_incoming_cpu_update(struct sock *sk)
{
916
917
918
919
	int cpu = raw_smp_processor_id();

	if (unlikely(sk->sk_incoming_cpu != cpu))
		sk->sk_incoming_cpu = cpu;
Eric Dumazet's avatar
Eric Dumazet committed
920
921
}

922
static inline void sock_rps_record_flow_hash(__u32 hash)
923
924
925
926
927
928
{
#ifdef CONFIG_RPS
	struct rps_sock_flow_table *sock_flow_table;

	rcu_read_lock();
	sock_flow_table = rcu_dereference(rps_sock_flow_table);
929
	rps_record_sock_flow(sock_flow_table, hash);
930
931
932
933
	rcu_read_unlock();
#endif
}

934
935
static inline void sock_rps_record_flow(const struct sock *sk)
{
936
#ifdef CONFIG_RPS
Eric Dumazet's avatar
Eric Dumazet committed
937
938
939
940
941
942
943
944
945
946
947
948
949
950
	if (static_key_false(&rfs_needed)) {
		/* Reading sk->sk_rxhash might incur an expensive cache line
		 * miss.
		 *
		 * TCP_ESTABLISHED does cover almost all states where RFS
		 * might be useful, and is cheaper [1] than testing :
		 *	IPv4: inet_sk(sk)->inet_daddr
		 * 	IPv6: ipv6_addr_any(&sk->sk_v6_daddr)
		 * OR	an additional socket flag
		 * [1] : sk_state and sk_prot are in the same cache line.
		 */
		if (sk->sk_state == TCP_ESTABLISHED)
			sock_rps_record_flow_hash(sk->sk_rxhash);
	}
951
#endif
952
953
}

954
955
static inline void sock_rps_save_rxhash(struct sock *sk,
					const struct sk_buff *skb)
956
957
{
#ifdef CONFIG_RPS
958
	if (unlikely(sk->sk_rxhash != skb->hash))
959
		sk->sk_rxhash = skb->hash;
960
961
962
#endif
}

963
964
965
966
967
968
969
static inline void sock_rps_reset_rxhash(struct sock *sk)
{
#ifdef CONFIG_RPS
	sk->sk_rxhash = 0;
#endif
}

970
#define sk_wait_event(__sk, __timeo, __condition, __wait)		\
971
972
973
974
	({	int __rc;						\
		release_sock(__sk);					\
		__rc = __condition;					\
		if (!__rc) {						\
975
976
977
			*(__timeo) = wait_woken(__wait,			\
						TASK_INTERRUPTIBLE,	\
						*(__timeo));		\
978
		}							\
979
		sched_annotate_sleep();					\
980
981
982
983
		lock_sock(__sk);					\
		__rc = __condition;					\
		__rc;							\
	})
Linus Torvalds's avatar
Linus Torvalds committed
984

985
986
987
988
989
990
991
int sk_stream_wait_connect(struct sock *sk, long *timeo_p);
int sk_stream_wait_memory(struct sock *sk, long *timeo_p);
void sk_stream_wait_close(struct sock *sk, long timeo_p);
int sk_stream_error(struct sock *sk, int flags, int err);
void sk_stream_kill_queues(struct sock *sk);
void sk_set_memalloc(struct sock *sk);
void sk_clear_memalloc(struct sock *sk);
Linus Torvalds's avatar
Linus Torvalds committed
992

993
994
995
996
997
998
999
1000
1001
1002
1003
void __sk_flush_backlog(struct sock *sk);

static inline bool sk_flush_backlog(struct sock *sk)
{
	if (unlikely(READ_ONCE(sk->sk_backlog.tail))) {
		__sk_flush_backlog(sk);
		return true;
	}
	return false;
}

1004
int sk_wait_data(struct sock *sk, long *timeo, const struct sk_buff *skb);
Linus Torvalds's avatar
Linus Torvalds committed
1005

1006
struct request_sock_ops;
1007
struct timewait_sock_ops;
1008
struct inet_hashinfo;
1009
struct raw_hashinfo;
1010
struct smc_hashinfo;
1011
struct module;
1012

Eric Dumazet's avatar
Eric Dumazet committed
1013
/*
1014
 * caches using SLAB_TYPESAFE_BY_RCU should let .next pointer from nulls nodes
Eric Dumazet's avatar
Eric Dumazet committed
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
 * un-modified. Special care is taken when initializing object to zero.
 */
static inline void sk_prot_clear_nulls(struct sock *sk, int size)
{