sock.h 66.3 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>
Linus Torvalds's avatar
Linus Torvalds committed
63
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
271
272
273
  *	@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
274
275
  *	@sk_prot_creator: sk_prot of original sock creator (see ipv6_setsockopt,
  *			  IPV6_ADDRFORM for instance)
276
  *	@sk_err: last error
Wang Chen's avatar
Wang Chen committed
277
278
  *	@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
279
  *	@sk_drops: raw/udp drops counter
280
281
  *	@sk_ack_backlog: current listen backlog
  *	@sk_max_ack_backlog: listen backlog set in listen()
282
  *	@sk_uid: user id of owner
283
284
285
  *	@sk_priority: %SO_PRIORITY setting
  *	@sk_type: socket type (%SOCK_STREAM, etc)
  *	@sk_protocol: which protocol this socket belongs in this network family
286
287
  *	@sk_peer_pid: &struct pid for this socket's peer
  *	@sk_peer_cred: %SO_PEERCRED setting
288
289
290
  *	@sk_rcvlowat: %SO_RCVLOWAT setting
  *	@sk_rcvtimeo: %SO_RCVTIMEO setting
  *	@sk_sndtimeo: %SO_SNDTIMEO setting
291
  *	@sk_txhash: computed flow hash for use on transmit
292
293
294
  *	@sk_filter: socket filtering instructions
  *	@sk_timer: sock cleanup timer
  *	@sk_stamp: time stamp of last packet received
295
  *	@sk_tsflags: SO_TIMESTAMPING socket options
296
  *	@sk_tskey: counter to disambiguate concurrent tstamp requests
297
298
  *	@sk_socket: Identd and reporting IO signals
  *	@sk_user_data: RPC layer private data
299
  *	@sk_frag: cached page frag
300
  *	@sk_peek_off: current peek_offset value
301
  *	@sk_send_head: front of stuff to transmit
302
  *	@sk_security: used by security modules
303
  *	@sk_mark: generic packet mark
304
  *	@sk_cgrp_data: cgroup data for this cgroup
305
  *	@sk_memcg: this socket's memory cgroup association
306
307
308
309
310
311
312
  *	@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
313
  *	@sk_reuseport_cb: reuseport group container
314
315
  *	@sk_rcu: used during RCU grace period
  */
Linus Torvalds's avatar
Linus Torvalds committed
316
317
struct sock {
	/*
318
	 * Now struct inet_timewait_sock also uses sock_common, so please just
Linus Torvalds's avatar
Linus Torvalds committed
319
320
321
	 * don't add nothing before this first member (__sk_common) --acme
	 */
	struct sock_common	__sk_common;
Eric Dumazet's avatar
Eric Dumazet committed
322
323
324
#define sk_node			__sk_common.skc_node
#define sk_nulls_node		__sk_common.skc_nulls_node
#define sk_refcnt		__sk_common.skc_refcnt
325
#define sk_tx_queue_mapping	__sk_common.skc_tx_queue_mapping
Eric Dumazet's avatar
Eric Dumazet committed
326

327
328
#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
329
#define sk_hash			__sk_common.skc_hash
Eric Dumazet's avatar
Eric Dumazet committed
330
#define sk_portpair		__sk_common.skc_portpair
Eric Dumazet's avatar
Eric Dumazet committed
331
332
#define sk_num			__sk_common.skc_num
#define sk_dport		__sk_common.skc_dport
Eric Dumazet's avatar
Eric Dumazet committed
333
334
335
#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
336
337
338
#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
339
#define sk_reuseport		__sk_common.skc_reuseport
340
#define sk_ipv6only		__sk_common.skc_ipv6only
341
#define sk_net_refcnt		__sk_common.skc_net_refcnt
Linus Torvalds's avatar
Linus Torvalds committed
342
343
#define sk_bound_dev_if		__sk_common.skc_bound_dev_if
#define sk_bind_node		__sk_common.skc_bind_node
344
#define sk_prot			__sk_common.skc_prot
345
#define sk_net			__sk_common.skc_net
346
347
#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
348
#define sk_cookie		__sk_common.skc_cookie
349
#define sk_incoming_cpu		__sk_common.skc_incoming_cpu
350
#define sk_flags		__sk_common.skc_flags
351
#define sk_rxhash		__sk_common.skc_rxhash
352

Linus Torvalds's avatar
Linus Torvalds committed
353
	socket_lock_t		sk_lock;
354
355
356
	atomic_t		sk_drops;
	int			sk_rcvlowat;
	struct sk_buff_head	sk_error_queue;
Eric Dumazet's avatar
Eric Dumazet committed
357
	struct sk_buff_head	sk_receive_queue;
358
359
360
361
	/*
	 * 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
362
363
364
	 * Note : rmem_alloc is in this structure to fill a hole
	 * on 64bit arches, not because its logically part of
	 * backlog.
365
366
	 */
	struct {
Eric Dumazet's avatar
Eric Dumazet committed
367
368
369
370
		atomic_t	rmem_alloc;
		int		len;
		struct sk_buff	*head;
		struct sk_buff	*tail;
371
	} sk_backlog;
Eric Dumazet's avatar
Eric Dumazet committed
372
#define sk_rmem_alloc sk_backlog.rmem_alloc
Eric Dumazet's avatar
Eric Dumazet committed
373

374
	int			sk_forward_alloc;
375
#ifdef CONFIG_NET_RX_BUSY_POLL
376
	unsigned int		sk_ll_usec;
377
378
	/* ===== mostly read cache line ===== */
	unsigned int		sk_napi_id;
Eric Dumazet's avatar
Eric Dumazet committed
379
380
381
382
#endif
	int			sk_rcvbuf;

	struct sk_filter __rcu	*sk_filter;
383
384
385
386
	union {
		struct socket_wq __rcu	*sk_wq;
		struct socket_wq	*sk_wq_raw;
	};
387
#ifdef CONFIG_XFRM
388
	struct xfrm_policy __rcu *sk_policy[2];
389
#endif
Eric Dumazet's avatar
Eric Dumazet committed
390
	struct dst_entry	*sk_rx_dst;
391
	struct dst_entry __rcu	*sk_dst_cache;
Linus Torvalds's avatar
Linus Torvalds committed
392
	atomic_t		sk_omem_alloc;
393
	int			sk_sndbuf;
394
395
396

	/* ===== cache line for TX ===== */
	int			sk_wmem_queued;
397
	refcount_t		sk_wmem_alloc;
398
399
	unsigned long		sk_tsq_flags;
	struct sk_buff		*sk_send_head;
Linus Torvalds's avatar
Linus Torvalds committed
400
	struct sk_buff_head	sk_write_queue;
401
402
	__s32			sk_peek_off;
	int			sk_write_pending;
403
	__u32			sk_dst_pending_confirm;
404
	u32			sk_pacing_status; /* see enum sk_pacing */
405
406
407
408
409
410
411
412
413
414
415
416
417
	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;
418
419
420
421
422

	/*
	 * Because of non atomicity rules, all
	 * changes are protected by socket lock.
	 */
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
	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

Eric Dumazet's avatar
Eric Dumazet committed
438
	kmemcheck_bitfield_begin(flags);
439
440
	unsigned int		sk_padding : 1,
				sk_kern_sock : 1,
441
442
				sk_no_check_tx : 1,
				sk_no_check_rx : 1,
Eric Dumazet's avatar
Eric Dumazet committed
443
444
445
				sk_userlocks : 4,
				sk_protocol  : 8,
				sk_type      : 16;
446
#define SK_PROTOCOL_MAX U8_MAX
Eric Dumazet's avatar
Eric Dumazet committed
447
	kmemcheck_bitfield_end(flags);
448

449
	u16			sk_gso_max_segs;
Linus Torvalds's avatar
Linus Torvalds committed
450
	unsigned long	        sk_lingertime;
451
	struct proto		*sk_prot_creator;
Linus Torvalds's avatar
Linus Torvalds committed
452
453
454
	rwlock_t		sk_callback_lock;
	int			sk_err,
				sk_err_soft;
455
456
	u32			sk_ack_backlog;
	u32			sk_max_ack_backlog;
457
	kuid_t			sk_uid;
458
459
	struct pid		*sk_peer_pid;
	const struct cred	*sk_peer_cred;
Linus Torvalds's avatar
Linus Torvalds committed
460
	long			sk_rcvtimeo;
461
	ktime_t			sk_stamp;
462
	u16			sk_tsflags;
463
	u8			sk_shutdown;
464
	u32			sk_tskey;
Linus Torvalds's avatar
Linus Torvalds committed
465
466
	struct socket		*sk_socket;
	void			*sk_user_data;
Alexey Dobriyan's avatar
Alexey Dobriyan committed
467
#ifdef CONFIG_SECURITY
Linus Torvalds's avatar
Linus Torvalds committed
468
	void			*sk_security;
Alexey Dobriyan's avatar
Alexey Dobriyan committed
469
#endif
470
	struct sock_cgroup_data	sk_cgrp_data;
471
	struct mem_cgroup	*sk_memcg;
Linus Torvalds's avatar
Linus Torvalds committed
472
	void			(*sk_state_change)(struct sock *sk);
473
	void			(*sk_data_ready)(struct sock *sk);
Linus Torvalds's avatar
Linus Torvalds committed
474
475
	void			(*sk_write_space)(struct sock *sk);
	void			(*sk_error_report)(struct sock *sk);
Eric Dumazet's avatar
Eric Dumazet committed
476
477
	int			(*sk_backlog_rcv)(struct sock *sk,
						  struct sk_buff *skb);
Linus Torvalds's avatar
Linus Torvalds committed
478
	void                    (*sk_destruct)(struct sock *sk);
479
	struct sock_reuseport __rcu	*sk_reuseport_cb;
480
	struct rcu_head		sk_rcu;
Linus Torvalds's avatar
Linus Torvalds committed
481
482
};

483
484
485
486
487
488
enum sk_pacing {
	SK_PACING_NONE		= 0,
	SK_PACING_NEEDED	= 1,
	SK_PACING_FQ		= 2,
};

489
490
491
492
493
#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)

494
495
496
497
498
499
500
501
502
503
504
/*
 * 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

505
506
int sk_set_peek_off(struct sock *sk, int val);

507
508
static inline int sk_peek_offset(struct sock *sk, int flags)
{
509
510
511
512
513
514
515
	if (unlikely(flags & MSG_PEEK)) {
		s32 off = READ_ONCE(sk->sk_peek_off);
		if (off >= 0)
			return off;
	}

	return 0;
516
517
518
519
}

static inline void sk_peek_offset_bwd(struct sock *sk, int val)
{
520
521
522
523
524
	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);
525
526
527
528
529
	}
}

static inline void sk_peek_offset_fwd(struct sock *sk, int val)
{
530
	sk_peek_offset_bwd(sk, -val);
531
532
}

Linus Torvalds's avatar
Linus Torvalds committed
533
534
535
/*
 * Hashed lists helper routines
 */
Li Zefan's avatar
Li Zefan committed
536
537
538
539
540
static inline struct sock *sk_entry(const struct hlist_node *node)
{
	return hlist_entry(node, struct sock, sk_node);
}

541
static inline struct sock *__sk_head(const struct hlist_head *head)
Linus Torvalds's avatar
Linus Torvalds committed
542
543
544
545
{
	return hlist_entry(head->first, struct sock, sk_node);
}

546
static inline struct sock *sk_head(const struct hlist_head *head)
Linus Torvalds's avatar
Linus Torvalds committed
547
548
549
550
{
	return hlist_empty(head) ? NULL : __sk_head(head);
}

551
552
553
554
555
556
557
558
559
560
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);
}

561
static inline struct sock *sk_next(const struct sock *sk)
Linus Torvalds's avatar
Linus Torvalds committed
562
{
Geliang Tang's avatar
Geliang Tang committed
563
	return hlist_entry_safe(sk->sk_node.next, struct sock, sk_node);
Linus Torvalds's avatar
Linus Torvalds committed
564
565
}

566
567
568
569
570
571
572
573
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
574
static inline bool sk_unhashed(const struct sock *sk)
Linus Torvalds's avatar
Linus Torvalds committed
575
576
577
578
{
	return hlist_unhashed(&sk->sk_node);
}

Eric Dumazet's avatar
Eric Dumazet committed
579
static inline bool sk_hashed(const struct sock *sk)
Linus Torvalds's avatar
Linus Torvalds committed
580
{
Akinobu Mita's avatar
Akinobu Mita committed
581
	return !sk_unhashed(sk);
Linus Torvalds's avatar
Linus Torvalds committed
582
583
}

Eric Dumazet's avatar
Eric Dumazet committed
584
static inline void sk_node_init(struct hlist_node *node)
Linus Torvalds's avatar
Linus Torvalds committed
585
586
587
588
{
	node->pprev = NULL;
}

Eric Dumazet's avatar
Eric Dumazet committed
589
static inline void sk_nulls_node_init(struct hlist_nulls_node *node)
590
591
592
593
{
	node->pprev = NULL;
}

Eric Dumazet's avatar
Eric Dumazet committed
594
static inline void __sk_del_node(struct sock *sk)
Linus Torvalds's avatar
Linus Torvalds committed
595
596
597
598
{
	__hlist_del(&sk->sk_node);
}

599
/* NB: equivalent to hlist_del_init_rcu */
Eric Dumazet's avatar
Eric Dumazet committed
600
static inline bool __sk_del_node_init(struct sock *sk)
Linus Torvalds's avatar
Linus Torvalds committed
601
602
603
604
{
	if (sk_hashed(sk)) {
		__sk_del_node(sk);
		sk_node_init(&sk->sk_node);
Eric Dumazet's avatar
Eric Dumazet committed
605
		return true;
Linus Torvalds's avatar
Linus Torvalds committed
606
	}
Eric Dumazet's avatar
Eric Dumazet committed
607
	return false;
Linus Torvalds's avatar
Linus Torvalds committed
608
609
610
611
612
613
614
615
}

/* 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.
 */

616
static __always_inline void sock_hold(struct sock *sk)
Linus Torvalds's avatar
Linus Torvalds committed
617
{
618
	refcount_inc(&sk->sk_refcnt);
Linus Torvalds's avatar
Linus Torvalds committed
619
620
621
622
623
}

/* Ungrab socket in the context, which assumes that socket refcnt
   cannot hit zero, f.e. it is true in context of any socketcall.
 */
624
static __always_inline void __sock_put(struct sock *sk)
Linus Torvalds's avatar
Linus Torvalds committed
625
{
626
	refcount_dec(&sk->sk_refcnt);
Linus Torvalds's avatar
Linus Torvalds committed
627
628
}

Eric Dumazet's avatar
Eric Dumazet committed
629
static inline bool sk_del_node_init(struct sock *sk)
Linus Torvalds's avatar
Linus Torvalds committed
630
{
Eric Dumazet's avatar
Eric Dumazet committed
631
	bool rc = __sk_del_node_init(sk);
Linus Torvalds's avatar
Linus Torvalds committed
632
633
634

	if (rc) {
		/* paranoid for a while -acme */
635
		WARN_ON(refcount_read(&sk->sk_refcnt) == 1);
Linus Torvalds's avatar
Linus Torvalds committed
636
637
638
639
		__sock_put(sk);
	}
	return rc;
}
640
#define sk_del_node_init_rcu(sk)	sk_del_node_init(sk)
Linus Torvalds's avatar
Linus Torvalds committed
641

Eric Dumazet's avatar
Eric Dumazet committed
642
static inline bool __sk_nulls_del_node_init_rcu(struct sock *sk)
643
644
{
	if (sk_hashed(sk)) {
645
		hlist_nulls_del_init_rcu(&sk->sk_nulls_node);
Eric Dumazet's avatar
Eric Dumazet committed
646
		return true;
647
	}
Eric Dumazet's avatar
Eric Dumazet committed
648
	return false;
649
650
}

Eric Dumazet's avatar
Eric Dumazet committed
651
static inline bool sk_nulls_del_node_init_rcu(struct sock *sk)
652
{
Eric Dumazet's avatar
Eric Dumazet committed
653
	bool rc = __sk_nulls_del_node_init_rcu(sk);
654
655
656

	if (rc) {
		/* paranoid for a while -acme */
657
		WARN_ON(refcount_read(&sk->sk_refcnt) == 1);
658
659
660
661
662
		__sock_put(sk);
	}
	return rc;
}

Eric Dumazet's avatar
Eric Dumazet committed
663
static inline void __sk_add_node(struct sock *sk, struct hlist_head *list)
Linus Torvalds's avatar
Linus Torvalds committed
664
665
666
667
{
	hlist_add_head(&sk->sk_node, list);
}

Eric Dumazet's avatar
Eric Dumazet committed
668
static inline void sk_add_node(struct sock *sk, struct hlist_head *list)
Linus Torvalds's avatar
Linus Torvalds committed
669
670
671
672
673
{
	sock_hold(sk);
	__sk_add_node(sk, list);
}

Eric Dumazet's avatar
Eric Dumazet committed
674
static inline void sk_add_node_rcu(struct sock *sk, struct hlist_head *list)
675
676
{
	sock_hold(sk);
677
678
679
680
681
	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);
682
683
}

Eric Dumazet's avatar
Eric Dumazet committed
684
static inline void __sk_nulls_add_node_rcu(struct sock *sk, struct hlist_nulls_head *list)
685
{
686
687
688
689
690
	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);
691
692
}

Eric Dumazet's avatar
Eric Dumazet committed
693
static inline void sk_nulls_add_node_rcu(struct sock *sk, struct hlist_nulls_head *list)
694
695
{
	sock_hold(sk);
696
	__sk_nulls_add_node_rcu(sk, list);
697
698
}

Eric Dumazet's avatar
Eric Dumazet committed
699
static inline void __sk_del_bind_node(struct sock *sk)
Linus Torvalds's avatar
Linus Torvalds committed
700
701
702
703
{
	__hlist_del(&sk->sk_bind_node);
}

Eric Dumazet's avatar
Eric Dumazet committed
704
static inline void sk_add_bind_node(struct sock *sk,
Linus Torvalds's avatar
Linus Torvalds committed
705
706
707
708
709
					struct hlist_head *list)
{
	hlist_add_head(&sk->sk_bind_node, list);
}

710
711
712
713
#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)
714
715
716
717
#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)
718
719
#define sk_for_each_from(__sk) \
	hlist_for_each_entry_from(__sk, sk_node)
720
721
722
#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)
723
724
725
726
#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
727

728
/**
729
 * sk_for_each_entry_offset_rcu - iterate over a list at a given struct offset
730
731
732
733
734
735
 * @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.
 *
 */
736
737
738
#define sk_for_each_entry_offset_rcu(tpos, pos, head, offset)		       \
	for (pos = rcu_dereference((head)->first);			       \
	     pos != NULL &&						       \
739
		({ tpos = (typeof(*tpos) *)((void *)pos - offset); 1;});       \
740
	     pos = rcu_dereference(pos->next))
741

742
743
744
745
746
747
748
749
750
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
751
752
753
754
755
756
757
758
759
760
761
762
763
764
/* 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 */
765
	SOCK_RCVTSTAMPNS, /* %SO_TIMESTAMPNS setting */
Linus Torvalds's avatar
Linus Torvalds committed
766
767
	SOCK_LOCALROUTE, /* route locally only, %SO_DONTROUTE setting */
	SOCK_QUEUE_SHRUNK, /* write queue has been shrunk recently */
768
	SOCK_MEMALLOC, /* VM depends on this socket for swapping */
769
	SOCK_TIMESTAMPING_RX_SOFTWARE,  /* %SOF_TIMESTAMPING_RX_SOFTWARE */
Eric Dumazet's avatar
Eric Dumazet committed
770
	SOCK_FASYNC, /* fasync() active */
771
	SOCK_RXQ_OVFL,
772
	SOCK_ZEROCOPY, /* buffers from userspace */
773
	SOCK_WIFI_STATUS, /* push wifi status to userspace */
774
775
776
777
	SOCK_NOFCS, /* Tell NIC not to do the Ethernet FCS.
		     * Will use last 4 bytes of packet sent from
		     * user-space instead.
		     */
778
	SOCK_FILTER_LOCKED, /* Filter cannot be changed anymore */
779
	SOCK_SELECT_ERR_QUEUE, /* Wake select on error queue */
780
	SOCK_RCU_FREE, /* wait rcu grace period in sk_destruct() */
Linus Torvalds's avatar
Linus Torvalds committed
781
782
};

783
784
#define SK_FLAGS_TIMESTAMP ((1UL << SOCK_TIMESTAMP) | (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE))

Ralf Baechle's avatar
Ralf Baechle committed
785
786
787
788
789
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
790
791
792
793
794
795
796
797
798
799
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
800
static inline bool sock_flag(const struct sock *sk, enum sock_flags flag)
Linus Torvalds's avatar
Linus Torvalds committed
801
802
803
804
{
	return test_bit(flag, &sk->sk_flags);
}

805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
#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

820
static inline gfp_t sk_gfp_mask(const struct sock *sk, gfp_t gfp_mask)
821
{
822
	return gfp_mask | (sk->sk_allocation & __GFP_MEMALLOC);
823
824
}

Linus Torvalds's avatar
Linus Torvalds committed
825
826
827
828
829
830
831
832
833
834
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
835
static inline bool sk_acceptq_is_full(const struct sock *sk)
Linus Torvalds's avatar
Linus Torvalds committed
836
{
837
	return sk->sk_ack_backlog > sk->sk_max_ack_backlog;
Linus Torvalds's avatar
Linus Torvalds committed
838
839
840
841
842
}

/*
 * Compute minimal free write space needed to queue new packets.
 */
Eric Dumazet's avatar
Eric Dumazet committed
843
static inline int sk_stream_min_wspace(const struct sock *sk)
Linus Torvalds's avatar
Linus Torvalds committed
844
{
845
	return sk->sk_wmem_queued >> 1;
Linus Torvalds's avatar
Linus Torvalds committed
846
847
}

Eric Dumazet's avatar
Eric Dumazet committed
848
static inline int sk_stream_wspace(const struct sock *sk)
Linus Torvalds's avatar
Linus Torvalds committed
849
850
851
852
{
	return sk->sk_sndbuf - sk->sk_wmem_queued;
}

853
void sk_stream_write_space(struct sock *sk);
Linus Torvalds's avatar
Linus Torvalds committed
854

Zhu Yi's avatar
Zhu Yi committed
855
/* OOB backlog add */
Zhu Yi's avatar
Zhu Yi committed
856
static inline void __sk_add_backlog(struct sock *sk, struct sk_buff *skb)
857
{
Eric Dumazet's avatar
Eric Dumazet committed
858
	/* dont let skb dst not refcounted, we are going to leave rcu lock */
Eric Dumazet's avatar
Eric Dumazet committed
859
	skb_dst_force_safe(skb);
Eric Dumazet's avatar
Eric Dumazet committed
860
861
862
863

	if (!sk->sk_backlog.tail)
		sk->sk_backlog.head = skb;
	else
864
		sk->sk_backlog.tail->next = skb;
Eric Dumazet's avatar
Eric Dumazet committed
865
866

	sk->sk_backlog.tail = skb;
867
868
	skb->next = NULL;
}
Linus Torvalds's avatar
Linus Torvalds committed
869

870
871
/*
 * Take into account size of receive queue and backlog queue
Eric Dumazet's avatar
Eric Dumazet committed
872
873
 * Do not take into account this skb truesize,
 * to allow even a single big packet to come.
874
 */
875
static inline bool sk_rcvqueues_full(const struct sock *sk, unsigned int limit)
876
877
878
{
	unsigned int qsize = sk->sk_backlog.len + atomic_read(&sk->sk_rmem_alloc);

879
	return qsize > limit;
880
881
}

Zhu Yi's avatar
Zhu Yi committed
882
/* The per-socket spinlock must be held here. */
883
884
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
885
{
886
	if (sk_rcvqueues_full(sk, limit))
Zhu Yi's avatar
Zhu Yi committed
887
888
		return -ENOBUFS;

889
890
891
892
893
894
895
896
	/*
	 * 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
897
	__sk_add_backlog(sk, skb);
Zhu Yi's avatar
Zhu Yi committed
898
899
900
901
	sk->sk_backlog.len += skb->truesize;
	return 0;
}

902
int __sk_backlog_rcv(struct sock *sk, struct sk_buff *skb);
903

904
905
static inline int sk_backlog_rcv(struct sock *sk, struct sk_buff *skb)
{
906
907
908
	if (sk_memalloc_socks() && skb_pfmemalloc(skb))
		return __sk_backlog_rcv(sk, skb);

909
910
911
	return sk->sk_backlog_rcv(sk, skb);
}

Eric Dumazet's avatar
Eric Dumazet committed
912
913
static inline void sk_incoming_cpu_update(struct sock *sk)
{
914
915
916
917
	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
918
919
}

920
static inline void sock_rps_record_flow_hash(__u32 hash)
921
922
923
924
925
926
{
#ifdef CONFIG_RPS
	struct rps_sock_flow_table *sock_flow_table;

	rcu_read_lock();
	sock_flow_table = rcu_dereference(rps_sock_flow_table);
927
	rps_record_sock_flow(sock_flow_table, hash);
928
929
930
931
	rcu_read_unlock();
#endif
}

932
933
static inline void sock_rps_record_flow(const struct sock *sk)
{
934
#ifdef CONFIG_RPS
Eric Dumazet's avatar
Eric Dumazet committed
935
936
937
938
939
940
941
942
943
944
945
946
947
948
	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);
	}
949
#endif
950
951
}

952
953
static inline void sock_rps_save_rxhash(struct sock *sk,
					const struct sk_buff *skb)
954
955
{
#ifdef CONFIG_RPS
956
	if (unlikely(sk->sk_rxhash != skb->hash))
957
		sk->sk_rxhash = skb->hash;
958
959
960
#endif
}

961
962
963
964
965
966
967
static inline void sock_rps_reset_rxhash(struct sock *sk)
{
#ifdef CONFIG_RPS
	sk->sk_rxhash = 0;
#endif
}

968
#define sk_wait_event(__sk, __timeo, __condition, __wait)		\
969
970
971
972
	({	int __rc;						\
		release_sock(__sk);					\
		__rc = __condition;					\
		if (!__rc) {						\
973
974
975
			*(__timeo) = wait_woken(__wait,			\
						TASK_INTERRUPTIBLE,	\
						*(__timeo));		\
976
		}							\
977
		sched_annotate_sleep();					\
978
979
980
981
		lock_sock(__sk);					\
		__rc = __condition;					\
		__rc;							\
	})
Linus Torvalds's avatar
Linus Torvalds committed
982

983
984
985
986
987
988
989
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
990

991
992
993
994
995
996
997
998
999
1000
1001
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;
}

1002
int sk_wait_data(struct sock *sk, long *timeo, const struct sk_buff *skb);
Linus Torvalds's avatar
Linus Torvalds committed
1003

1004
struct request_sock_ops;
1005
struct timewait_sock_ops;
1006
struct inet_hashinfo;
1007
struct raw_hashinfo;
1008
struct smc_hashinfo;
1009
struct module;
1010

Eric Dumazet's avatar
Eric Dumazet committed
1011
/*
1012
 * caches using SLAB_TYPESAFE_BY_RCU should let .next pointer from nulls nodes
Eric Dumazet's avatar
Eric Dumazet committed
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
 * un-modified. Special care is taken when initializing object to zero.
 */
static inline void sk_prot_clear_nulls(struct sock *sk, int size)
{
	if (offsetof(struct sock, sk_node.next) != 0)
		memset(sk, 0, offsetof(struct sock, sk_node.next));
	memset(&sk->sk_node.pprev, 0,
	       size - offsetof(struct sock, sk_node.pprev));
}

Linus Torvalds's avatar
Linus Torvalds committed
1023
1024
1025
1026
/* Networking protocol blocks we attach to sockets.
 * socket layer -> transport layer interface
 */
struct proto {
Eric Dumazet's avatar
Eric Dumazet committed
1027
	void			(*close)(struct sock *sk,
Linus Torvalds's avatar
Linus Torvalds committed
1028
1029
					long timeout);
	int			(*connect)(struct sock *sk,
Eric Dumazet's avatar
Eric Dumazet committed
1030
					struct sockaddr *uaddr,
Linus Torvalds's avatar
Linus Torvalds committed
1031