sock.h 51.9 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/kernel.h>
Linus Torvalds's avatar
Linus Torvalds committed
44
#include <linux/list.h>
45
#include <linux/list_nulls.h>
Linus Torvalds's avatar
Linus Torvalds committed
46 47 48
#include <linux/timer.h>
#include <linux/cache.h>
#include <linux/module.h>
49
#include <linux/lockdep.h>
Linus Torvalds's avatar
Linus Torvalds committed
50 51
#include <linux/netdevice.h>
#include <linux/skbuff.h>	/* struct sk_buff */
Al Viro's avatar
Al Viro committed
52
#include <linux/mm.h>
Linus Torvalds's avatar
Linus Torvalds committed
53
#include <linux/security.h>
54
#include <linux/slab.h>
55
#include <linux/uaccess.h>
Linus Torvalds's avatar
Linus Torvalds committed
56 57

#include <linux/filter.h>
58
#include <linux/rculist_nulls.h>
59
#include <linux/poll.h>
Linus Torvalds's avatar
Linus Torvalds committed
60

61
#include <linux/atomic.h>
Linus Torvalds's avatar
Linus Torvalds committed
62 63 64 65 66 67 68 69 70 71 72 73 74 75 76
#include <net/dst.h>
#include <net/checksum.h>

/*
 * 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
77
/* Validate arguments and do nothing */
78
static inline void __attribute__ ((format (printf, 2, 3)))
79 80 81
SOCK_DEBUG(struct sock *sk, const char *msg, ...)
{
}
Linus Torvalds's avatar
Linus Torvalds committed
82 83 84 85 86 87 88 89
#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;
90
	int			owned;
Linus Torvalds's avatar
Linus Torvalds committed
91
	wait_queue_head_t	wq;
92 93 94 95 96 97 98 99 100
	/*
	 * 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
101 102 103
} socket_lock_t;

struct sock;
104
struct proto;
105
struct net;
Linus Torvalds's avatar
Linus Torvalds committed
106 107

/**
108
 *	struct sock_common - minimal network layer representation of sockets
109 110
 *	@skc_daddr: Foreign IPv4 addr
 *	@skc_rcv_saddr: Bound local IPv4 addr
Eric Dumazet's avatar
Eric Dumazet committed
111
 *	@skc_hash: hash value used with various protocol lookup tables
112
 *	@skc_u16hashes: two u16 hash values used by UDP lookup tables
113 114 115 116 117
 *	@skc_family: network address family
 *	@skc_state: Connection state
 *	@skc_reuse: %SO_REUSEADDR setting
 *	@skc_bound_dev_if: bound device index if != 0
 *	@skc_bind_node: bind hash linkage for various protocol lookup tables
118
 *	@skc_portaddr_node: second hash linkage for UDP/UDP-Lite protocol
119
 *	@skc_prot: protocol handlers inside a network family
120
 *	@skc_net: reference to the network namespace of this socket
121 122 123 124
 *	@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
 *	@skc_refcnt: reference count
125 126
 *
 *	This is the minimal network layer representation of sockets, the header
127 128
 *	for struct sock and struct inet_timewait_sock.
 */
Linus Torvalds's avatar
Linus Torvalds committed
129
struct sock_common {
130 131
	/* skc_daddr and skc_rcv_saddr must be grouped :
	 * cf INET_MATCH() and INET_TW_MATCH()
Eric Dumazet's avatar
Eric Dumazet committed
132
	 */
133 134
	__be32			skc_daddr;
	__be32			skc_rcv_saddr;
Eric Dumazet's avatar
Eric Dumazet committed
135

136 137 138 139
	union  {
		unsigned int	skc_hash;
		__u16		skc_u16hashes[2];
	};
Eric Dumazet's avatar
Eric Dumazet committed
140 141 142 143
	unsigned short		skc_family;
	volatile unsigned char	skc_state;
	unsigned char		skc_reuse;
	int			skc_bound_dev_if;
144 145 146 147
	union {
		struct hlist_node	skc_bind_node;
		struct hlist_nulls_node skc_portaddr_node;
	};
148
	struct proto		*skc_prot;
149
#ifdef CONFIG_NET_NS
150
	struct net	 	*skc_net;
151
#endif
152 153 154 155
	/*
	 * fields between dontcopy_begin/dontcopy_end
	 * are not copied in sock_copy()
	 */
156
	/* private: */
157
	int			skc_dontcopy_begin[0];
158
	/* public: */
159 160 161 162 163 164
	union {
		struct hlist_node	skc_node;
		struct hlist_nulls_node skc_nulls_node;
	};
	int			skc_tx_queue_mapping;
	atomic_t		skc_refcnt;
165
	/* private: */
166
	int                     skc_dontcopy_end[0];
167
	/* public: */
Linus Torvalds's avatar
Linus Torvalds committed
168 169 170 171
};

/**
  *	struct sock - network layer representation of sockets
172
  *	@__sk_common: shared layout with inet_timewait_sock
173 174 175 176
  *	@sk_shutdown: mask of %SEND_SHUTDOWN and/or %RCV_SHUTDOWN
  *	@sk_userlocks: %SO_SNDBUF and %SO_RCVBUF settings
  *	@sk_lock:	synchronizer
  *	@sk_rcvbuf: size of receive buffer in bytes
177
  *	@sk_wq: sock wait queue and async head
178 179 180 181 182 183 184
  *	@sk_dst_cache: destination cache
  *	@sk_dst_lock: destination cache lock
  *	@sk_policy: flow policy
  *	@sk_rmem_alloc: receive queue bytes committed
  *	@sk_receive_queue: incoming packets
  *	@sk_wmem_alloc: transmit queue bytes committed
  *	@sk_write_queue: Packet sending queue
185
  *	@sk_async_wait_queue: DMA copied packets
186 187 188 189 190
  *	@sk_omem_alloc: "o" is "option" or "other"
  *	@sk_wmem_queued: persistent queue size
  *	@sk_forward_alloc: space allocated forward
  *	@sk_allocation: allocation mode
  *	@sk_sndbuf: size of send buffer in bytes
Wang Chen's avatar
Wang Chen committed
191
  *	@sk_flags: %SO_LINGER (l_onoff), %SO_BROADCAST, %SO_KEEPALIVE,
192
  *		   %SO_OOBINLINE settings, %SO_TIMESTAMPING settings
193 194
  *	@sk_no_check: %SO_NO_CHECK setting, wether or not checkup packets
  *	@sk_route_caps: route capabilities (e.g. %NETIF_F_TSO)
Eric Dumazet's avatar
Eric Dumazet committed
195
  *	@sk_route_nocaps: forbidden route capabilities (e.g NETIF_F_GSO_MASK)
196
  *	@sk_gso_type: GSO type (e.g. %SKB_GSO_TCPV4)
197
  *	@sk_gso_max_size: Maximum GSO segment size to build
198 199 200 201
  *	@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
202 203
  *	@sk_prot_creator: sk_prot of original sock creator (see ipv6_setsockopt,
  *			  IPV6_ADDRFORM for instance)
204
  *	@sk_err: last error
Wang Chen's avatar
Wang Chen committed
205 206
  *	@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
207
  *	@sk_drops: raw/udp drops counter
208 209 210 211 212
  *	@sk_ack_backlog: current listen backlog
  *	@sk_max_ack_backlog: listen backlog set in listen()
  *	@sk_priority: %SO_PRIORITY setting
  *	@sk_type: socket type (%SOCK_STREAM, etc)
  *	@sk_protocol: which protocol this socket belongs in this network family
213 214
  *	@sk_peer_pid: &struct pid for this socket's peer
  *	@sk_peer_cred: %SO_PEERCRED setting
215 216 217
  *	@sk_rcvlowat: %SO_RCVLOWAT setting
  *	@sk_rcvtimeo: %SO_RCVTIMEO setting
  *	@sk_sndtimeo: %SO_SNDTIMEO setting
218
  *	@sk_rxhash: flow hash received from netif layer
219 220 221 222 223 224 225 226 227
  *	@sk_filter: socket filtering instructions
  *	@sk_protinfo: private area, net family specific, when not using slab
  *	@sk_timer: sock cleanup timer
  *	@sk_stamp: time stamp of last packet received
  *	@sk_socket: Identd and reporting IO signals
  *	@sk_user_data: RPC layer private data
  *	@sk_sndmsg_page: cached page for sendmsg
  *	@sk_sndmsg_off: cached offset for sendmsg
  *	@sk_send_head: front of stuff to transmit
228
  *	@sk_security: used by security modules
229
  *	@sk_mark: generic packet mark
230
  *	@sk_classid: this socket's cgroup classid
231 232 233 234 235 236 237
  *	@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
Linus Torvalds's avatar
Linus Torvalds committed
238 239 240
 */
struct sock {
	/*
241
	 * Now struct inet_timewait_sock also uses sock_common, so please just
Linus Torvalds's avatar
Linus Torvalds committed
242 243 244
	 * don't add nothing before this first member (__sk_common) --acme
	 */
	struct sock_common	__sk_common;
Eric Dumazet's avatar
Eric Dumazet committed
245 246 247
#define sk_node			__sk_common.skc_node
#define sk_nulls_node		__sk_common.skc_nulls_node
#define sk_refcnt		__sk_common.skc_refcnt
248
#define sk_tx_queue_mapping	__sk_common.skc_tx_queue_mapping
Eric Dumazet's avatar
Eric Dumazet committed
249

250 251
#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
252
#define sk_hash			__sk_common.skc_hash
Linus Torvalds's avatar
Linus Torvalds committed
253 254 255 256 257
#define sk_family		__sk_common.skc_family
#define sk_state		__sk_common.skc_state
#define sk_reuse		__sk_common.skc_reuse
#define sk_bound_dev_if		__sk_common.skc_bound_dev_if
#define sk_bind_node		__sk_common.skc_bind_node
258
#define sk_prot			__sk_common.skc_prot
259
#define sk_net			__sk_common.skc_net
Linus Torvalds's avatar
Linus Torvalds committed
260
	socket_lock_t		sk_lock;
Eric Dumazet's avatar
Eric Dumazet committed
261
	struct sk_buff_head	sk_receive_queue;
262 263 264 265
	/*
	 * 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
266 267 268
	 * Note : rmem_alloc is in this structure to fill a hole
	 * on 64bit arches, not because its logically part of
	 * backlog.
269 270
	 */
	struct {
Eric Dumazet's avatar
Eric Dumazet committed
271 272 273 274
		atomic_t	rmem_alloc;
		int		len;
		struct sk_buff	*head;
		struct sk_buff	*tail;
275
	} sk_backlog;
Eric Dumazet's avatar
Eric Dumazet committed
276 277 278 279 280 281 282 283 284
#define sk_rmem_alloc sk_backlog.rmem_alloc
	int			sk_forward_alloc;
#ifdef CONFIG_RPS
	__u32			sk_rxhash;
#endif
	atomic_t		sk_drops;
	int			sk_rcvbuf;

	struct sk_filter __rcu	*sk_filter;
285
	struct socket_wq __rcu	*sk_wq;
Eric Dumazet's avatar
Eric Dumazet committed
286 287 288 289 290

#ifdef CONFIG_NET_DMA
	struct sk_buff_head	sk_async_wait_queue;
#endif

291
#ifdef CONFIG_XFRM
Linus Torvalds's avatar
Linus Torvalds committed
292
	struct xfrm_policy	*sk_policy[2];
293
#endif
Eric Dumazet's avatar
Eric Dumazet committed
294 295
	unsigned long 		sk_flags;
	struct dst_entry	*sk_dst_cache;
Eric Dumazet's avatar
Eric Dumazet committed
296
	spinlock_t		sk_dst_lock;
Linus Torvalds's avatar
Linus Torvalds committed
297 298
	atomic_t		sk_wmem_alloc;
	atomic_t		sk_omem_alloc;
299
	int			sk_sndbuf;
Linus Torvalds's avatar
Linus Torvalds committed
300
	struct sk_buff_head	sk_write_queue;
Eric Dumazet's avatar
Eric Dumazet committed
301 302 303 304 305 306 307
	kmemcheck_bitfield_begin(flags);
	unsigned int		sk_shutdown  : 2,
				sk_no_check  : 2,
				sk_userlocks : 4,
				sk_protocol  : 8,
				sk_type      : 16;
	kmemcheck_bitfield_end(flags);
Linus Torvalds's avatar
Linus Torvalds committed
308
	int			sk_wmem_queued;
Al Viro's avatar
Al Viro committed
309
	gfp_t			sk_allocation;
Linus Torvalds's avatar
Linus Torvalds committed
310
	int			sk_route_caps;
Eric Dumazet's avatar
Eric Dumazet committed
311
	int			sk_route_nocaps;
312
	int			sk_gso_type;
313
	unsigned int		sk_gso_max_size;
314
	int			sk_rcvlowat;
Linus Torvalds's avatar
Linus Torvalds committed
315 316
	unsigned long	        sk_lingertime;
	struct sk_buff_head	sk_error_queue;
317
	struct proto		*sk_prot_creator;
Linus Torvalds's avatar
Linus Torvalds committed
318 319 320 321 322 323
	rwlock_t		sk_callback_lock;
	int			sk_err,
				sk_err_soft;
	unsigned short		sk_ack_backlog;
	unsigned short		sk_max_ack_backlog;
	__u32			sk_priority;
324 325
	struct pid		*sk_peer_pid;
	const struct cred	*sk_peer_cred;
Linus Torvalds's avatar
Linus Torvalds committed
326 327 328 329
	long			sk_rcvtimeo;
	long			sk_sndtimeo;
	void			*sk_protinfo;
	struct timer_list	sk_timer;
330
	ktime_t			sk_stamp;
Linus Torvalds's avatar
Linus Torvalds committed
331 332 333 334 335 336
	struct socket		*sk_socket;
	void			*sk_user_data;
	struct page		*sk_sndmsg_page;
	struct sk_buff		*sk_send_head;
	__u32			sk_sndmsg_off;
	int			sk_write_pending;
Alexey Dobriyan's avatar
Alexey Dobriyan committed
337
#ifdef CONFIG_SECURITY
Linus Torvalds's avatar
Linus Torvalds committed
338
	void			*sk_security;
Alexey Dobriyan's avatar
Alexey Dobriyan committed
339
#endif
340
	__u32			sk_mark;
341
	u32			sk_classid;
Linus Torvalds's avatar
Linus Torvalds committed
342 343 344 345 346 347 348 349 350 351 352 353
	void			(*sk_state_change)(struct sock *sk);
	void			(*sk_data_ready)(struct sock *sk, int bytes);
	void			(*sk_write_space)(struct sock *sk);
	void			(*sk_error_report)(struct sock *sk);
  	int			(*sk_backlog_rcv)(struct sock *sk,
						  struct sk_buff *skb);  
	void                    (*sk_destruct)(struct sock *sk);
};

/*
 * Hashed lists helper routines
 */
Li Zefan's avatar
Li Zefan committed
354 355 356 357 358
static inline struct sock *sk_entry(const struct hlist_node *node)
{
	return hlist_entry(node, struct sock, sk_node);
}

359
static inline struct sock *__sk_head(const struct hlist_head *head)
Linus Torvalds's avatar
Linus Torvalds committed
360 361 362 363
{
	return hlist_entry(head->first, struct sock, sk_node);
}

364
static inline struct sock *sk_head(const struct hlist_head *head)
Linus Torvalds's avatar
Linus Torvalds committed
365 366 367 368
{
	return hlist_empty(head) ? NULL : __sk_head(head);
}

369 370 371 372 373 374 375 376 377 378
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);
}

379
static inline struct sock *sk_next(const struct sock *sk)
Linus Torvalds's avatar
Linus Torvalds committed
380 381 382 383 384
{
	return sk->sk_node.next ?
		hlist_entry(sk->sk_node.next, struct sock, sk_node) : NULL;
}

385 386 387 388 389 390 391 392
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;
}

393
static inline int sk_unhashed(const struct sock *sk)
Linus Torvalds's avatar
Linus Torvalds committed
394 395 396 397
{
	return hlist_unhashed(&sk->sk_node);
}

398
static inline int sk_hashed(const struct sock *sk)
Linus Torvalds's avatar
Linus Torvalds committed
399
{
Akinobu Mita's avatar
Akinobu Mita committed
400
	return !sk_unhashed(sk);
Linus Torvalds's avatar
Linus Torvalds committed
401 402 403 404 405 406 407
}

static __inline__ void sk_node_init(struct hlist_node *node)
{
	node->pprev = NULL;
}

408 409 410 411 412
static __inline__ void sk_nulls_node_init(struct hlist_nulls_node *node)
{
	node->pprev = NULL;
}

Linus Torvalds's avatar
Linus Torvalds committed
413 414 415 416 417
static __inline__ void __sk_del_node(struct sock *sk)
{
	__hlist_del(&sk->sk_node);
}

418
/* NB: equivalent to hlist_del_init_rcu */
Linus Torvalds's avatar
Linus Torvalds committed
419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458
static __inline__ int __sk_del_node_init(struct sock *sk)
{
	if (sk_hashed(sk)) {
		__sk_del_node(sk);
		sk_node_init(&sk->sk_node);
		return 1;
	}
	return 0;
}

/* 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.
 */

static inline void sock_hold(struct sock *sk)
{
	atomic_inc(&sk->sk_refcnt);
}

/* Ungrab socket in the context, which assumes that socket refcnt
   cannot hit zero, f.e. it is true in context of any socketcall.
 */
static inline void __sock_put(struct sock *sk)
{
	atomic_dec(&sk->sk_refcnt);
}

static __inline__ int sk_del_node_init(struct sock *sk)
{
	int rc = __sk_del_node_init(sk);

	if (rc) {
		/* paranoid for a while -acme */
		WARN_ON(atomic_read(&sk->sk_refcnt) == 1);
		__sock_put(sk);
	}
	return rc;
}
459
#define sk_del_node_init_rcu(sk)	sk_del_node_init(sk)
Linus Torvalds's avatar
Linus Torvalds committed
460

461
static __inline__ int __sk_nulls_del_node_init_rcu(struct sock *sk)
462 463
{
	if (sk_hashed(sk)) {
464
		hlist_nulls_del_init_rcu(&sk->sk_nulls_node);
465 466 467 468 469
		return 1;
	}
	return 0;
}

470
static __inline__ int sk_nulls_del_node_init_rcu(struct sock *sk)
471
{
472
	int rc = __sk_nulls_del_node_init_rcu(sk);
473 474 475 476 477 478 479 480 481

	if (rc) {
		/* paranoid for a while -acme */
		WARN_ON(atomic_read(&sk->sk_refcnt) == 1);
		__sock_put(sk);
	}
	return rc;
}

Linus Torvalds's avatar
Linus Torvalds committed
482 483 484 485 486 487 488 489 490 491 492
static __inline__ void __sk_add_node(struct sock *sk, struct hlist_head *list)
{
	hlist_add_head(&sk->sk_node, list);
}

static __inline__ void sk_add_node(struct sock *sk, struct hlist_head *list)
{
	sock_hold(sk);
	__sk_add_node(sk, list);
}

493 494 495 496 497 498
static __inline__ void sk_add_node_rcu(struct sock *sk, struct hlist_head *list)
{
	sock_hold(sk);
	hlist_add_head_rcu(&sk->sk_node, list);
}

499
static __inline__ void __sk_nulls_add_node_rcu(struct sock *sk, struct hlist_nulls_head *list)
500
{
501
	hlist_nulls_add_head_rcu(&sk->sk_nulls_node, list);
502 503
}

504
static __inline__ void sk_nulls_add_node_rcu(struct sock *sk, struct hlist_nulls_head *list)
505 506
{
	sock_hold(sk);
507
	__sk_nulls_add_node_rcu(sk, list);
508 509
}

Linus Torvalds's avatar
Linus Torvalds committed
510 511 512 513 514 515 516 517 518 519 520 521 522
static __inline__ void __sk_del_bind_node(struct sock *sk)
{
	__hlist_del(&sk->sk_bind_node);
}

static __inline__ void sk_add_bind_node(struct sock *sk,
					struct hlist_head *list)
{
	hlist_add_head(&sk->sk_bind_node, list);
}

#define sk_for_each(__sk, node, list) \
	hlist_for_each_entry(__sk, node, list, sk_node)
523 524
#define sk_for_each_rcu(__sk, node, list) \
	hlist_for_each_entry_rcu(__sk, node, list, sk_node)
525 526 527 528
#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)
Linus Torvalds's avatar
Linus Torvalds committed
529 530 531
#define sk_for_each_from(__sk, node) \
	if (__sk && ({ node = &(__sk)->sk_node; 1; })) \
		hlist_for_each_entry_from(__sk, node, sk_node)
532 533 534
#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)
Linus Torvalds's avatar
Linus Torvalds committed
535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553
#define sk_for_each_safe(__sk, node, tmp, list) \
	hlist_for_each_entry_safe(__sk, node, tmp, list, sk_node)
#define sk_for_each_bound(__sk, node, list) \
	hlist_for_each_entry(__sk, node, list, sk_bind_node)

/* 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 */
554
	SOCK_RCVTSTAMPNS, /* %SO_TIMESTAMPNS setting */
Linus Torvalds's avatar
Linus Torvalds committed
555 556
	SOCK_LOCALROUTE, /* route locally only, %SO_DONTROUTE setting */
	SOCK_QUEUE_SHRUNK, /* write queue has been shrunk recently */
557 558 559 560 561 562 563
	SOCK_TIMESTAMPING_TX_HARDWARE,  /* %SOF_TIMESTAMPING_TX_HARDWARE */
	SOCK_TIMESTAMPING_TX_SOFTWARE,  /* %SOF_TIMESTAMPING_TX_SOFTWARE */
	SOCK_TIMESTAMPING_RX_HARDWARE,  /* %SOF_TIMESTAMPING_RX_HARDWARE */
	SOCK_TIMESTAMPING_RX_SOFTWARE,  /* %SOF_TIMESTAMPING_RX_SOFTWARE */
	SOCK_TIMESTAMPING_SOFTWARE,     /* %SOF_TIMESTAMPING_SOFTWARE */
	SOCK_TIMESTAMPING_RAW_HARDWARE, /* %SOF_TIMESTAMPING_RAW_HARDWARE */
	SOCK_TIMESTAMPING_SYS_HARDWARE, /* %SOF_TIMESTAMPING_SYS_HARDWARE */
Eric Dumazet's avatar
Eric Dumazet committed
564
	SOCK_FASYNC, /* fasync() active */
565
	SOCK_RXQ_OVFL,
Linus Torvalds's avatar
Linus Torvalds committed
566 567
};

Ralf Baechle's avatar
Ralf Baechle committed
568 569 570 571 572
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
573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599
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);
}

static inline int sock_flag(struct sock *sk, enum sock_flags flag)
{
	return test_bit(flag, &sk->sk_flags);
}

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++;
}

static inline int sk_acceptq_is_full(struct sock *sk)
{
600
	return sk->sk_ack_backlog > sk->sk_max_ack_backlog;
Linus Torvalds's avatar
Linus Torvalds committed
601 602 603 604 605 606 607
}

/*
 * Compute minimal free write space needed to queue new packets.
 */
static inline int sk_stream_min_wspace(struct sock *sk)
{
608
	return sk->sk_wmem_queued >> 1;
Linus Torvalds's avatar
Linus Torvalds committed
609 610 611 612 613 614 615 616 617 618 619 620 621 622
}

static inline int sk_stream_wspace(struct sock *sk)
{
	return sk->sk_sndbuf - sk->sk_wmem_queued;
}

extern void sk_stream_write_space(struct sock *sk);

static inline int sk_stream_memory_free(struct sock *sk)
{
	return sk->sk_wmem_queued < sk->sk_sndbuf;
}

Zhu Yi's avatar
Zhu Yi committed
623
/* OOB backlog add */
Zhu Yi's avatar
Zhu Yi committed
624
static inline void __sk_add_backlog(struct sock *sk, struct sk_buff *skb)
625
{
Eric Dumazet's avatar
Eric Dumazet committed
626 627 628 629 630 631
	/* dont let skb dst not refcounted, we are going to leave rcu lock */
	skb_dst_force(skb);

	if (!sk->sk_backlog.tail)
		sk->sk_backlog.head = skb;
	else
632
		sk->sk_backlog.tail->next = skb;
Eric Dumazet's avatar
Eric Dumazet committed
633 634

	sk->sk_backlog.tail = skb;
635 636
	skb->next = NULL;
}
Linus Torvalds's avatar
Linus Torvalds committed
637

638 639 640 641 642 643 644 645 646 647
/*
 * Take into account size of receive queue and backlog queue
 */
static inline bool sk_rcvqueues_full(const struct sock *sk, const struct sk_buff *skb)
{
	unsigned int qsize = sk->sk_backlog.len + atomic_read(&sk->sk_rmem_alloc);

	return qsize + skb->truesize > sk->sk_rcvbuf;
}

Zhu Yi's avatar
Zhu Yi committed
648
/* The per-socket spinlock must be held here. */
649
static inline __must_check int sk_add_backlog(struct sock *sk, struct sk_buff *skb)
Zhu Yi's avatar
Zhu Yi committed
650
{
651
	if (sk_rcvqueues_full(sk, skb))
Zhu Yi's avatar
Zhu Yi committed
652 653
		return -ENOBUFS;

Zhu Yi's avatar
Zhu Yi committed
654
	__sk_add_backlog(sk, skb);
Zhu Yi's avatar
Zhu Yi committed
655 656 657 658
	sk->sk_backlog.len += skb->truesize;
	return 0;
}

659 660 661 662 663
static inline int sk_backlog_rcv(struct sock *sk, struct sk_buff *skb)
{
	return sk->sk_backlog_rcv(sk, skb);
}

664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697
static inline void sock_rps_record_flow(const struct sock *sk)
{
#ifdef CONFIG_RPS
	struct rps_sock_flow_table *sock_flow_table;

	rcu_read_lock();
	sock_flow_table = rcu_dereference(rps_sock_flow_table);
	rps_record_sock_flow(sock_flow_table, sk->sk_rxhash);
	rcu_read_unlock();
#endif
}

static inline void sock_rps_reset_flow(const struct sock *sk)
{
#ifdef CONFIG_RPS
	struct rps_sock_flow_table *sock_flow_table;

	rcu_read_lock();
	sock_flow_table = rcu_dereference(rps_sock_flow_table);
	rps_reset_sock_flow(sock_flow_table, sk->sk_rxhash);
	rcu_read_unlock();
#endif
}

static inline void sock_rps_save_rxhash(struct sock *sk, u32 rxhash)
{
#ifdef CONFIG_RPS
	if (unlikely(sk->sk_rxhash != rxhash)) {
		sock_rps_reset_flow(sk);
		sk->sk_rxhash = rxhash;
	}
#endif
}

698 699 700 701 702 703 704 705 706 707 708
#define sk_wait_event(__sk, __timeo, __condition)			\
	({	int __rc;						\
		release_sock(__sk);					\
		__rc = __condition;					\
		if (!__rc) {						\
			*(__timeo) = schedule_timeout(*(__timeo));	\
		}							\
		lock_sock(__sk);					\
		__rc = __condition;					\
		__rc;							\
	})
Linus Torvalds's avatar
Linus Torvalds committed
709 710 711 712 713 714 715 716 717

extern int sk_stream_wait_connect(struct sock *sk, long *timeo_p);
extern int sk_stream_wait_memory(struct sock *sk, long *timeo_p);
extern void sk_stream_wait_close(struct sock *sk, long timeo_p);
extern int sk_stream_error(struct sock *sk, int flags, int err);
extern void sk_stream_kill_queues(struct sock *sk);

extern int sk_wait_data(struct sock *sk, long *timeo);

718
struct request_sock_ops;
719
struct timewait_sock_ops;
720
struct inet_hashinfo;
721
struct raw_hashinfo;
722

Linus Torvalds's avatar
Linus Torvalds committed
723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739
/* Networking protocol blocks we attach to sockets.
 * socket layer -> transport layer interface
 * transport -> network interface is defined by struct inet_proto
 */
struct proto {
	void			(*close)(struct sock *sk, 
					long timeout);
	int			(*connect)(struct sock *sk,
				        struct sockaddr *uaddr, 
					int addr_len);
	int			(*disconnect)(struct sock *sk, int flags);

	struct sock *		(*accept) (struct sock *sk, int flags, int *err);

	int			(*ioctl)(struct sock *sk, int cmd,
					 unsigned long arg);
	int			(*init)(struct sock *sk);
740
	void			(*destroy)(struct sock *sk);
Linus Torvalds's avatar
Linus Torvalds committed
741 742 743
	void			(*shutdown)(struct sock *sk, int how);
	int			(*setsockopt)(struct sock *sk, int level, 
					int optname, char __user *optval,
744
					unsigned int optlen);
Linus Torvalds's avatar
Linus Torvalds committed
745 746 747
	int			(*getsockopt)(struct sock *sk, int level, 
					int optname, char __user *optval, 
					int __user *option);  	 
748
#ifdef CONFIG_COMPAT
749 750 751
	int			(*compat_setsockopt)(struct sock *sk,
					int level,
					int optname, char __user *optval,
752
					unsigned int optlen);
753 754 755 756
	int			(*compat_getsockopt)(struct sock *sk,
					int level,
					int optname, char __user *optval,
					int __user *option);
757 758
	int			(*compat_ioctl)(struct sock *sk,
					unsigned int cmd, unsigned long arg);
759
#endif
Linus Torvalds's avatar
Linus Torvalds committed
760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776
	int			(*sendmsg)(struct kiocb *iocb, struct sock *sk,
					   struct msghdr *msg, size_t len);
	int			(*recvmsg)(struct kiocb *iocb, struct sock *sk,
					   struct msghdr *msg,
					size_t len, int noblock, int flags, 
					int *addr_len);
	int			(*sendpage)(struct sock *sk, struct page *page,
					int offset, size_t size, int flags);
	int			(*bind)(struct sock *sk, 
					struct sockaddr *uaddr, int addr_len);

	int			(*backlog_rcv) (struct sock *sk, 
						struct sk_buff *skb);

	/* Keeping track of sk's, looking them up, and port selection methods. */
	void			(*hash)(struct sock *sk);
	void			(*unhash)(struct sock *sk);
Eric Dumazet's avatar
Eric Dumazet committed
777
	void			(*rehash)(struct sock *sk);
Linus Torvalds's avatar
Linus Torvalds committed
778
	int			(*get_port)(struct sock *sk, unsigned short snum);
779
	void			(*clear_sk)(struct sock *sk, int size);
Linus Torvalds's avatar
Linus Torvalds committed
780

781
	/* Keeping track of sockets in use */
782
#ifdef CONFIG_PROC_FS
783
	unsigned int		inuse_idx;
784
#endif
785

Linus Torvalds's avatar
Linus Torvalds committed
786
	/* Memory pressure */
787
	void			(*enter_memory_pressure)(struct sock *sk);
Eric Dumazet's avatar
Eric Dumazet committed
788
	atomic_long_t		*memory_allocated;	/* Current allocated memory. */
789
	struct percpu_counter	*sockets_allocated;	/* Current number of sockets. */
Linus Torvalds's avatar
Linus Torvalds committed
790 791 792
	/*
	 * Pressure flag: try to collapse.
	 * Technical note: it is used by multiple contexts non atomically.
793
	 * All the __sk_mem_schedule() is of this nature: accounting
Linus Torvalds's avatar
Linus Torvalds committed
794 795 796
	 * is strict, actions are advisory and have some latency.
	 */
	int			*memory_pressure;
Eric Dumazet's avatar
Eric Dumazet committed
797
	long			*sysctl_mem;
Linus Torvalds's avatar
Linus Torvalds committed
798 799 800
	int			*sysctl_wmem;
	int			*sysctl_rmem;
	int			max_header;
801
	bool			no_autobind;
Linus Torvalds's avatar
Linus Torvalds committed
802

803
	struct kmem_cache	*slab;
Linus Torvalds's avatar
Linus Torvalds committed
804
	unsigned int		obj_size;
805
	int			slab_flags;
Linus Torvalds's avatar
Linus Torvalds committed
806

807
	struct percpu_counter	*orphan_count;
808

809
	struct request_sock_ops	*rsk_prot;
810
	struct timewait_sock_ops *twsk_prot;
811

812 813
	union {
		struct inet_hashinfo	*hashinfo;
814
		struct udp_table	*udp_table;
815
		struct raw_hashinfo	*raw_hash;
816
	} h;
817

Linus Torvalds's avatar
Linus Torvalds committed
818 819 820 821 822
	struct module		*owner;

	char			name[32];

	struct list_head	node;
823 824 825
#ifdef SOCK_REFCNT_DEBUG
	atomic_t		socks;
#endif
Linus Torvalds's avatar
Linus Torvalds committed
826 827 828 829 830
};

extern int proto_register(struct proto *prot, int alloc_slab);
extern void proto_unregister(struct proto *prot);

831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855
#ifdef SOCK_REFCNT_DEBUG
static inline void sk_refcnt_debug_inc(struct sock *sk)
{
	atomic_inc(&sk->sk_prot->socks);
}

static inline void sk_refcnt_debug_dec(struct sock *sk)
{
	atomic_dec(&sk->sk_prot->socks);
	printk(KERN_DEBUG "%s socket %p released, %d are still alive\n",
	       sk->sk_prot->name, sk, atomic_read(&sk->sk_prot->socks));
}

static inline void sk_refcnt_debug_release(const struct sock *sk)
{
	if (atomic_read(&sk->sk_refcnt) != 1)
		printk(KERN_DEBUG "Destruction of the %s socket %p delayed, refcnt=%d\n",
		       sk->sk_prot->name, sk, atomic_read(&sk->sk_refcnt));
}
#else /* SOCK_REFCNT_DEBUG */
#define sk_refcnt_debug_inc(sk) do { } while (0)
#define sk_refcnt_debug_dec(sk) do { } while (0)
#define sk_refcnt_debug_release(sk) do { } while (0)
#endif /* SOCK_REFCNT_DEBUG */

856 857

#ifdef CONFIG_PROC_FS
Linus Torvalds's avatar
Linus Torvalds committed
858
/* Called with local bh disabled */
859 860
extern void sock_prot_inuse_add(struct net *net, struct proto *prot, int inc);
extern int sock_prot_inuse_get(struct net *net, struct proto *proto);
861
#else
862 863
static void inline sock_prot_inuse_add(struct net *net, struct proto *prot,
		int inc)
864 865 866 867
{
}
#endif

Linus Torvalds's avatar
Linus Torvalds committed
868

869 870 871 872 873 874 875 876 877
/* With per-bucket locks this operation is not-atomic, so that
 * this version is not worse.
 */
static inline void __sk_prot_rehash(struct sock *sk)
{
	sk->sk_prot->unhash(sk);
	sk->sk_prot->hash(sk);
}

878 879
void sk_prot_clear_portaddr_nulls(struct sock *sk, int size);

Linus Torvalds's avatar
Linus Torvalds committed
880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932
/* About 10 seconds */
#define SOCK_DESTROY_TIME (10*HZ)

/* Sockets 0-1023 can't be bound to unless you are superuser */
#define PROT_SOCK	1024

#define SHUTDOWN_MASK	3
#define RCV_SHUTDOWN	1
#define SEND_SHUTDOWN	2

#define SOCK_SNDBUF_LOCK	1
#define SOCK_RCVBUF_LOCK	2
#define SOCK_BINDADDR_LOCK	4
#define SOCK_BINDPORT_LOCK	8

/* sock_iocb: used to kick off async processing of socket ios */
struct sock_iocb {
	struct list_head	list;

	int			flags;
	int			size;
	struct socket		*sock;
	struct sock		*sk;
	struct scm_cookie	*scm;
	struct msghdr		*msg, async_msg;
	struct kiocb		*kiocb;
};

static inline struct sock_iocb *kiocb_to_siocb(struct kiocb *iocb)
{
	return (struct sock_iocb *)iocb->private;
}

static inline struct kiocb *siocb_to_kiocb(struct sock_iocb *si)
{
	return si->kiocb;
}

struct socket_alloc {
	struct socket socket;
	struct inode vfs_inode;
};

static inline struct socket *SOCKET_I(struct inode *inode)
{
	return &container_of(inode, struct socket_alloc, vfs_inode)->socket;
}

static inline struct inode *SOCK_INODE(struct socket *socket)
{
	return &container_of(socket, struct socket_alloc, socket)->vfs_inode;
}

933 934 935 936 937
/*
 * Functions for memory accounting
 */
extern int __sk_mem_schedule(struct sock *sk, int size, int kind);
extern void __sk_mem_reclaim(struct sock *sk);
Linus Torvalds's avatar
Linus Torvalds committed
938

939 940 941 942
#define SK_MEM_QUANTUM ((int)PAGE_SIZE)
#define SK_MEM_QUANTUM_SHIFT ilog2(SK_MEM_QUANTUM)
#define SK_MEM_SEND	0
#define SK_MEM_RECV	1
Linus Torvalds's avatar
Linus Torvalds committed
943

944
static inline int sk_mem_pages(int amt)
Linus Torvalds's avatar
Linus Torvalds committed
945
{
946
	return (amt + SK_MEM_QUANTUM - 1) >> SK_MEM_QUANTUM_SHIFT;
Linus Torvalds's avatar
Linus Torvalds committed
947 948
}

949
static inline int sk_has_account(struct sock *sk)
Linus Torvalds's avatar
Linus Torvalds committed
950
{
951 952
	/* return true if protocol supports memory accounting */
	return !!sk->sk_prot->memory_allocated;
Linus Torvalds's avatar
Linus Torvalds committed
953 954
}

955
static inline int sk_wmem_schedule(struct sock *sk, int size)
Linus Torvalds's avatar
Linus Torvalds committed
956
{
957 958 959 960
	if (!sk_has_account(sk))
		return 1;
	return size <= sk->sk_forward_alloc ||
		__sk_mem_schedule(sk, size, SK_MEM_SEND);
Linus Torvalds's avatar
Linus Torvalds committed
961 962
}

963
static inline int sk_rmem_schedule(struct sock *sk, int size)
964
{
965 966
	if (!sk_has_account(sk))
		return 1;
967
	return size <= sk->sk_forward_alloc ||
968 969 970 971 972 973 974 975 976 977 978
		__sk_mem_schedule(sk, size, SK_MEM_RECV);
}

static inline void sk_mem_reclaim(struct sock *sk)
{
	if (!sk_has_account(sk))
		return;
	if (sk->sk_forward_alloc >= SK_MEM_QUANTUM)
		__sk_mem_reclaim(sk);
}

979 980 981 982 983 984 985 986
static inline void sk_mem_reclaim_partial(struct sock *sk)
{
	if (!sk_has_account(sk))
		return;
	if (sk->sk_forward_alloc > SK_MEM_QUANTUM)
		__sk_mem_reclaim(sk);
}

987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006
static inline void sk_mem_charge(struct sock *sk, int size)
{
	if (!sk_has_account(sk))
		return;
	sk->sk_forward_alloc -= size;
}

static inline void sk_mem_uncharge(struct sock *sk, int size)
{
	if (!sk_has_account(sk))
		return;
	sk->sk_forward_alloc += size;
}

static inline void sk_wmem_free_skb(struct sock *sk, struct sk_buff *skb)
{
	sock_set_flag(sk, SOCK_QUEUE_SHRUNK);
	sk->sk_wmem_queued -= skb->truesize;
	sk_mem_uncharge(sk, skb->truesize);
	__kfree_skb(skb);
1007 1008
}

Linus Torvalds's avatar
Linus Torvalds committed
1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021
/* Used by processes to "lock" a socket state, so that
 * interrupts and bottom half handlers won't change it
 * from under us. It essentially blocks any incoming
 * packets, so that we won't get any new data or any
 * packets that change the state of the socket.
 *
 * While locked, BH processing will add new packets to
 * the backlog queue.  This queue is processed by the
 * owner of the socket lock right before it is released.
 *
 * Since ~2.3.5 it is also exclusive sleep lock serializing
 * accesses from user process context.
 */
1022
#define sock_owned_by_user(sk)	((sk)->sk_lock.owned)
Linus Torvalds's avatar
Linus Torvalds committed
1023

1024 1025 1026 1027 1028 1029 1030 1031 1032
/*
 * Macro so as to not evaluate some arguments when
 * lockdep is not enabled.
 *
 * Mark both the sk_lock and the sk_lock.slock as a
 * per-address-family lock class.
 */
#define sock_lock_init_class_and_name(sk, sname, skey, name, key) 	\
do {									\
1033
	sk->sk_lock.owned = 0;						\
1034 1035 1036 1037 1038 1039 1040 1041 1042
	init_waitqueue_head(&sk->sk_lock.wq);				\
	spin_lock_init(&(sk)->sk_lock.slock);				\
	debug_check_no_locks_freed((void *)&(sk)->sk_lock,		\
			sizeof((sk)->sk_lock));				\
	lockdep_set_class_and_name(&(sk)->sk_lock.slock,		\
		       	(skey), (sname));				\
	lockdep_init_map(&(sk)->sk_lock.dep_map, (name), (key), 0);	\
} while (0)

Harvey Harrison's avatar
Harvey Harrison committed
1043
extern void lock_sock_nested(struct sock *sk, int subclass);
1044 1045 1046 1047 1048 1049

static inline void lock_sock(struct sock *sk)
{
	lock_sock_nested(sk, 0);
}

Harvey Harrison's avatar
Harvey Harrison committed
1050
extern void release_sock(struct sock *sk);
Linus Torvalds's avatar
Linus Torvalds committed
1051 1052 1053

/* BH context may only use the following locking interface. */
#define bh_lock_sock(__sk)	spin_lock(&((__sk)->sk_lock.slock))
1054 1055 1056
#define bh_lock_sock_nested(__sk) \
				spin_lock_nested(&((__sk)->sk_lock.slock), \
				SINGLE_DEPTH_NESTING)
Linus Torvalds's avatar
Linus Torvalds committed
1057 1058
#define bh_unlock_sock(__sk)	spin_unlock(&((__sk)->sk_lock.slock))

1059 1060 1061 1062 1063 1064 1065 1066 1067 1068
extern bool lock_sock_fast(struct sock *sk);
/**
 * unlock_sock_fast - complement of lock_sock_fast
 * @sk: socket
 * @slow: slow mode
 *
 * fast unlock socket for user context.
 * If slow mode is on, we call regular release_sock()
 */
static inline void unlock_sock_fast(struct sock *sk, bool slow)
Eric Dumazet's avatar
Eric Dumazet committed
1069
{
1070 1071 1072 1073
	if (slow)
		release_sock(sk);
	else
		spin_unlock_bh(&sk->sk_lock.slock);
Eric Dumazet's avatar
Eric Dumazet committed
1074 1075 1076
}


1077
extern struct sock		*sk_alloc(struct net *net, int family,
1078
					  gfp_t priority,
1079
					  struct proto *prot);
Linus Torvalds's avatar
Linus Torvalds committed
1080
extern void			sk_free(struct sock *sk);
1081
extern void			sk_release_kernel(struct sock *sk);
1082
extern struct sock		*sk_clone(const struct sock *sk,
1083
					  const gfp_t priority);
Linus Torvalds's avatar
Linus Torvalds committed
1084 1085 1086

extern struct sk_buff		*sock_wmalloc(struct sock *sk,
					      unsigned long size, int force,
1087
					      gfp_t priority);
Linus Torvalds's avatar
Linus Torvalds committed
1088 1089
extern struct sk_buff		*sock_rmalloc(struct sock *sk,
					      unsigned long size, int force,
1090
					      gfp_t priority);
Linus Torvalds's avatar
Linus Torvalds committed
1091 1092 1093 1094 1095
extern void			sock_wfree(struct sk_buff *skb);
extern void			sock_rfree(struct sk_buff *skb);

extern int			sock_setsockopt(struct socket *sock, int level,
						int op, char __user *optval,
1096
						unsigned int optlen);
Linus Torvalds's avatar
Linus Torvalds committed
1097 1098 1099 1100 1101 1102 1103 1104

extern int			sock_getsockopt(struct socket *sock, int level,
						int op, char __user *optval, 
						int __user *optlen);
extern struct sk_buff 		*sock_alloc_send_skb(struct sock *sk,
						     unsigned long size,
						     int noblock,
						     int *errcode);
1105 1106 1107 1108 1109
extern struct sk_buff 		*sock_alloc_send_pskb(struct sock *sk,
						      unsigned long header_len,
						      unsigned long data_len,
						      int noblock,
						      int *errcode);
Victor Fusco's avatar
Victor Fusco committed
1110
extern void *sock_kmalloc(struct sock *sk, int size,
1111
			  gfp_t priority);
Linus Torvalds's avatar
Linus Torvalds committed
1112 1113 1114
extern void sock_kfree_s(struct sock *sk, void *mem, int size);
extern void sk_send_sigurg(struct sock *sk);

1115 1116 1117 1118 1119 1120 1121 1122
#ifdef CONFIG_CGROUPS
extern void sock_update_classid(struct sock *sk);
#else
static inline void sock_update_classid(struct sock *sk)
{
}
#endif

Linus Torvalds's avatar
Linus Torvalds committed
1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145
/*
 * Functions to fill in entries in struct proto_ops when a protocol
 * does not implement a particular function.
 */
extern int                      sock_no_bind(struct socket *, 
					     struct sockaddr *, int);
extern int                      sock_no_connect(struct socket *,
						struct sockaddr *, int, int);
extern int                      sock_no_socketpair(struct socket *,
						   struct socket *);
extern int                      sock_no_accept(struct socket *,
					       struct socket *, int);
extern int                      sock_no_getname(struct socket *,
						struct sockaddr *, int *, int);
extern unsigned int             sock_no_poll(struct file *, struct socket *,
					     struct poll_table_struct *);
extern int                      sock_no_ioctl(struct socket *, unsigned int,
					      unsigned long);
extern int			sock_no_listen(struct socket *, int);
extern int                      sock_no_shutdown(struct socket *, int);
extern int			sock_no_getsockopt(struct socket *, int , int,
						   char __user *, int __user *);
extern int			sock_no_setsockopt(struct socket *, int, int,
1146
						   char __user *, unsigned int);
Linus Torvalds's avatar
Linus Torvalds committed
1147 1148 1149 1150 1151 1152 1153 1154 1155 1156