2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
6 * Definitions for the AF_INET socket handler.
8 * Version: @(#)sock.h 1.0.4 05/13/93
11 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
12 * Corey Minyard <wf-rch!minyard@relay.EU.net>
13 * Florian La Roche <flla@stud.uni-sb.de>
16 * Alan Cox : Volatiles in skbuff pointers. See
17 * skbuff comments. May be overdone,
18 * better to prove they can be removed
20 * Alan Cox : Added a zapped field for tcp to note
21 * a socket is reset and must stay shut up
22 * Alan Cox : New fields for options
23 * Pauline Middelink : identd support
24 * Alan Cox : Eliminate low level recv/recvfrom
25 * David S. Miller : New socket lookup architecture.
26 * Steve Whitehouse: Default routines for sock_ops
27 * Arnaldo C. Melo : removed net_pinfo, tp_pinfo and made
28 * protinfo be just a void pointer, as the
29 * protocol specific parts were moved to
30 * respective headers and ipv4/v6, etc now
31 * use private slabcaches for its socks
32 * Pedro Hortas : New flags field for socket options
35 * This program is free software; you can redistribute it and/or
36 * modify it under the terms of the GNU General Public License
37 * as published by the Free Software Foundation; either version
38 * 2 of the License, or (at your option) any later version.
43 #include <linux/kernel.h>
44 #include <linux/list.h>
45 #include <linux/list_nulls.h>
46 #include <linux/timer.h>
47 #include <linux/cache.h>
48 #include <linux/module.h>
49 #include <linux/lockdep.h>
50 #include <linux/netdevice.h>
51 #include <linux/skbuff.h> /* struct sk_buff */
53 #include <linux/security.h>
55 #include <linux/filter.h>
56 #include <linux/rculist_nulls.h>
57 #include <linux/poll.h>
59 #include <asm/atomic.h>
61 #include <net/checksum.h>
64 * This structure really needs to be cleaned up.
65 * Most of it is for TCP, and not used by any of
66 * the other protocols.
69 /* Define this to get the SOCK_DBG debugging facility. */
70 #define SOCK_DEBUGGING
72 #define SOCK_DEBUG(sk, msg...) do { if ((sk) && sock_flag((sk), SOCK_DBG)) \
73 printk(KERN_DEBUG msg); } while (0)
75 /* Validate arguments and do nothing */
76 static void inline int __attribute__ ((format (printf
, 2, 3)))
77 SOCK_DEBUG(struct sock
*sk
, const char *msg
, ...)
82 /* This is the per-socket lock. The spinlock provides a synchronization
83 * between user contexts and software interrupt processing, whereas the
84 * mini-semaphore synchronizes multiple users amongst themselves.
91 * We express the mutex-alike socket_lock semantics
92 * to the lock validator by explicitly managing
93 * the slock as a lock variant (in addition to
96 #ifdef CONFIG_DEBUG_LOCK_ALLOC
97 struct lockdep_map dep_map
;
106 * struct sock_common - minimal network layer representation of sockets
107 * @skc_family: network address family
108 * @skc_state: Connection state
109 * @skc_reuse: %SO_REUSEADDR setting
110 * @skc_bound_dev_if: bound device index if != 0
111 * @skc_node: main hash linkage for various protocol lookup tables
112 * @skc_nulls_node: main hash linkage for UDP/UDP-Lite protocol
113 * @skc_bind_node: bind hash linkage for various protocol lookup tables
114 * @skc_refcnt: reference count
115 * @skc_hash: hash value used with various protocol lookup tables
116 * @skc_prot: protocol handlers inside a network family
117 * @skc_net: reference to the network namespace of this socket
119 * This is the minimal network layer representation of sockets, the header
120 * for struct sock and struct inet_timewait_sock.
123 unsigned short skc_family
;
124 volatile unsigned char skc_state
;
125 unsigned char skc_reuse
;
126 int skc_bound_dev_if
;
128 struct hlist_node skc_node
;
129 struct hlist_nulls_node skc_nulls_node
;
131 struct hlist_node skc_bind_node
;
133 unsigned int skc_hash
;
134 struct proto
*skc_prot
;
141 * struct sock - network layer representation of sockets
142 * @__sk_common: shared layout with inet_timewait_sock
143 * @sk_shutdown: mask of %SEND_SHUTDOWN and/or %RCV_SHUTDOWN
144 * @sk_userlocks: %SO_SNDBUF and %SO_RCVBUF settings
145 * @sk_lock: synchronizer
146 * @sk_rcvbuf: size of receive buffer in bytes
147 * @sk_sleep: sock wait queue
148 * @sk_dst_cache: destination cache
149 * @sk_dst_lock: destination cache lock
150 * @sk_policy: flow policy
151 * @sk_rmem_alloc: receive queue bytes committed
152 * @sk_receive_queue: incoming packets
153 * @sk_wmem_alloc: transmit queue bytes committed
154 * @sk_write_queue: Packet sending queue
155 * @sk_async_wait_queue: DMA copied packets
156 * @sk_omem_alloc: "o" is "option" or "other"
157 * @sk_wmem_queued: persistent queue size
158 * @sk_forward_alloc: space allocated forward
159 * @sk_allocation: allocation mode
160 * @sk_sndbuf: size of send buffer in bytes
161 * @sk_flags: %SO_LINGER (l_onoff), %SO_BROADCAST, %SO_KEEPALIVE,
162 * %SO_OOBINLINE settings, %SO_TIMESTAMPING settings
163 * @sk_no_check: %SO_NO_CHECK setting, wether or not checkup packets
164 * @sk_route_caps: route capabilities (e.g. %NETIF_F_TSO)
165 * @sk_gso_type: GSO type (e.g. %SKB_GSO_TCPV4)
166 * @sk_gso_max_size: Maximum GSO segment size to build
167 * @sk_lingertime: %SO_LINGER l_linger setting
168 * @sk_backlog: always used with the per-socket spinlock held
169 * @sk_callback_lock: used with the callbacks in the end of this struct
170 * @sk_error_queue: rarely used
171 * @sk_prot_creator: sk_prot of original sock creator (see ipv6_setsockopt,
172 * IPV6_ADDRFORM for instance)
173 * @sk_err: last error
174 * @sk_err_soft: errors that don't cause failure but are the cause of a
175 * persistent failure not just 'timed out'
176 * @sk_drops: raw/udp drops counter
177 * @sk_ack_backlog: current listen backlog
178 * @sk_max_ack_backlog: listen backlog set in listen()
179 * @sk_priority: %SO_PRIORITY setting
180 * @sk_type: socket type (%SOCK_STREAM, etc)
181 * @sk_protocol: which protocol this socket belongs in this network family
182 * @sk_peercred: %SO_PEERCRED setting
183 * @sk_rcvlowat: %SO_RCVLOWAT setting
184 * @sk_rcvtimeo: %SO_RCVTIMEO setting
185 * @sk_sndtimeo: %SO_SNDTIMEO setting
186 * @sk_filter: socket filtering instructions
187 * @sk_protinfo: private area, net family specific, when not using slab
188 * @sk_timer: sock cleanup timer
189 * @sk_stamp: time stamp of last packet received
190 * @sk_socket: Identd and reporting IO signals
191 * @sk_user_data: RPC layer private data
192 * @sk_sndmsg_page: cached page for sendmsg
193 * @sk_sndmsg_off: cached offset for sendmsg
194 * @sk_send_head: front of stuff to transmit
195 * @sk_security: used by security modules
196 * @sk_mark: generic packet mark
197 * @sk_write_pending: a write to stream socket waits to start
198 * @sk_state_change: callback to indicate change in the state of the sock
199 * @sk_data_ready: callback to indicate there is data to be processed
200 * @sk_write_space: callback to indicate there is bf sending space available
201 * @sk_error_report: callback to indicate errors (e.g. %MSG_ERRQUEUE)
202 * @sk_backlog_rcv: callback to process the backlog
203 * @sk_destruct: called at sock freeing time, i.e. when all refcnt == 0
207 * Now struct inet_timewait_sock also uses sock_common, so please just
208 * don't add nothing before this first member (__sk_common) --acme
210 struct sock_common __sk_common
;
211 #define sk_family __sk_common.skc_family
212 #define sk_state __sk_common.skc_state
213 #define sk_reuse __sk_common.skc_reuse
214 #define sk_bound_dev_if __sk_common.skc_bound_dev_if
215 #define sk_node __sk_common.skc_node
216 #define sk_nulls_node __sk_common.skc_nulls_node
217 #define sk_bind_node __sk_common.skc_bind_node
218 #define sk_refcnt __sk_common.skc_refcnt
219 #define sk_hash __sk_common.skc_hash
220 #define sk_prot __sk_common.skc_prot
221 #define sk_net __sk_common.skc_net
222 kmemcheck_bitfield_begin(flags
);
223 unsigned char sk_shutdown
: 2,
226 kmemcheck_bitfield_end(flags
);
227 unsigned char sk_protocol
;
228 unsigned short sk_type
;
230 socket_lock_t sk_lock
;
232 * The backlog queue is special, it is always used with
233 * the per-socket spinlock held and requires low latency
234 * access. Therefore we special case it's implementation.
237 struct sk_buff
*head
;
238 struct sk_buff
*tail
;
240 wait_queue_head_t
*sk_sleep
;
241 struct dst_entry
*sk_dst_cache
;
243 struct xfrm_policy
*sk_policy
[2];
245 rwlock_t sk_dst_lock
;
246 atomic_t sk_rmem_alloc
;
247 atomic_t sk_wmem_alloc
;
248 atomic_t sk_omem_alloc
;
250 struct sk_buff_head sk_receive_queue
;
251 struct sk_buff_head sk_write_queue
;
252 #ifdef CONFIG_NET_DMA
253 struct sk_buff_head sk_async_wait_queue
;
256 int sk_forward_alloc
;
260 unsigned int sk_gso_max_size
;
262 unsigned long sk_flags
;
263 unsigned long sk_lingertime
;
264 struct sk_buff_head sk_error_queue
;
265 struct proto
*sk_prot_creator
;
266 rwlock_t sk_callback_lock
;
270 unsigned short sk_ack_backlog
;
271 unsigned short sk_max_ack_backlog
;
273 struct ucred sk_peercred
;
276 struct sk_filter
*sk_filter
;
278 struct timer_list sk_timer
;
280 struct socket
*sk_socket
;
282 struct page
*sk_sndmsg_page
;
283 struct sk_buff
*sk_send_head
;
285 int sk_write_pending
;
286 #ifdef CONFIG_SECURITY
290 /* XXX 4 bytes hole on 64 bit */
291 void (*sk_state_change
)(struct sock
*sk
);
292 void (*sk_data_ready
)(struct sock
*sk
, int bytes
);
293 void (*sk_write_space
)(struct sock
*sk
);
294 void (*sk_error_report
)(struct sock
*sk
);
295 int (*sk_backlog_rcv
)(struct sock
*sk
,
296 struct sk_buff
*skb
);
297 void (*sk_destruct
)(struct sock
*sk
);
301 * Hashed lists helper routines
303 static inline struct sock
*__sk_head(const struct hlist_head
*head
)
305 return hlist_entry(head
->first
, struct sock
, sk_node
);
308 static inline struct sock
*sk_head(const struct hlist_head
*head
)
310 return hlist_empty(head
) ? NULL
: __sk_head(head
);
313 static inline struct sock
*__sk_nulls_head(const struct hlist_nulls_head
*head
)
315 return hlist_nulls_entry(head
->first
, struct sock
, sk_nulls_node
);
318 static inline struct sock
*sk_nulls_head(const struct hlist_nulls_head
*head
)
320 return hlist_nulls_empty(head
) ? NULL
: __sk_nulls_head(head
);
323 static inline struct sock
*sk_next(const struct sock
*sk
)
325 return sk
->sk_node
.next
?
326 hlist_entry(sk
->sk_node
.next
, struct sock
, sk_node
) : NULL
;
329 static inline struct sock
*sk_nulls_next(const struct sock
*sk
)
331 return (!is_a_nulls(sk
->sk_nulls_node
.next
)) ?
332 hlist_nulls_entry(sk
->sk_nulls_node
.next
,
333 struct sock
, sk_nulls_node
) :
337 static inline int sk_unhashed(const struct sock
*sk
)
339 return hlist_unhashed(&sk
->sk_node
);
342 static inline int sk_hashed(const struct sock
*sk
)
344 return !sk_unhashed(sk
);
347 static __inline__
void sk_node_init(struct hlist_node
*node
)
352 static __inline__
void sk_nulls_node_init(struct hlist_nulls_node
*node
)
357 static __inline__
void __sk_del_node(struct sock
*sk
)
359 __hlist_del(&sk
->sk_node
);
362 static __inline__
int __sk_del_node_init(struct sock
*sk
)
366 sk_node_init(&sk
->sk_node
);
372 /* Grab socket reference count. This operation is valid only
373 when sk is ALREADY grabbed f.e. it is found in hash table
374 or a list and the lookup is made under lock preventing hash table
378 static inline void sock_hold(struct sock
*sk
)
380 atomic_inc(&sk
->sk_refcnt
);
383 /* Ungrab socket in the context, which assumes that socket refcnt
384 cannot hit zero, f.e. it is true in context of any socketcall.
386 static inline void __sock_put(struct sock
*sk
)
388 atomic_dec(&sk
->sk_refcnt
);
391 static __inline__
int sk_del_node_init(struct sock
*sk
)
393 int rc
= __sk_del_node_init(sk
);
396 /* paranoid for a while -acme */
397 WARN_ON(atomic_read(&sk
->sk_refcnt
) == 1);
403 static __inline__
int __sk_nulls_del_node_init_rcu(struct sock
*sk
)
406 hlist_nulls_del_init_rcu(&sk
->sk_nulls_node
);
412 static __inline__
int sk_nulls_del_node_init_rcu(struct sock
*sk
)
414 int rc
= __sk_nulls_del_node_init_rcu(sk
);
417 /* paranoid for a while -acme */
418 WARN_ON(atomic_read(&sk
->sk_refcnt
) == 1);
424 static __inline__
void __sk_add_node(struct sock
*sk
, struct hlist_head
*list
)
426 hlist_add_head(&sk
->sk_node
, list
);
429 static __inline__
void sk_add_node(struct sock
*sk
, struct hlist_head
*list
)
432 __sk_add_node(sk
, list
);
435 static __inline__
void __sk_nulls_add_node_rcu(struct sock
*sk
, struct hlist_nulls_head
*list
)
437 hlist_nulls_add_head_rcu(&sk
->sk_nulls_node
, list
);
440 static __inline__
void sk_nulls_add_node_rcu(struct sock
*sk
, struct hlist_nulls_head
*list
)
443 __sk_nulls_add_node_rcu(sk
, list
);
446 static __inline__
void __sk_del_bind_node(struct sock
*sk
)
448 __hlist_del(&sk
->sk_bind_node
);
451 static __inline__
void sk_add_bind_node(struct sock
*sk
,
452 struct hlist_head
*list
)
454 hlist_add_head(&sk
->sk_bind_node
, list
);
457 #define sk_for_each(__sk, node, list) \
458 hlist_for_each_entry(__sk, node, list, sk_node)
459 #define sk_nulls_for_each(__sk, node, list) \
460 hlist_nulls_for_each_entry(__sk, node, list, sk_nulls_node)
461 #define sk_nulls_for_each_rcu(__sk, node, list) \
462 hlist_nulls_for_each_entry_rcu(__sk, node, list, sk_nulls_node)
463 #define sk_for_each_from(__sk, node) \
464 if (__sk && ({ node = &(__sk)->sk_node; 1; })) \
465 hlist_for_each_entry_from(__sk, node, sk_node)
466 #define sk_nulls_for_each_from(__sk, node) \
467 if (__sk && ({ node = &(__sk)->sk_nulls_node; 1; })) \
468 hlist_nulls_for_each_entry_from(__sk, node, sk_nulls_node)
469 #define sk_for_each_continue(__sk, node) \
470 if (__sk && ({ node = &(__sk)->sk_node; 1; })) \
471 hlist_for_each_entry_continue(__sk, node, sk_node)
472 #define sk_for_each_safe(__sk, node, tmp, list) \
473 hlist_for_each_entry_safe(__sk, node, tmp, list, sk_node)
474 #define sk_for_each_bound(__sk, node, list) \
475 hlist_for_each_entry(__sk, node, list, sk_bind_node)
488 SOCK_USE_WRITE_QUEUE
, /* whether to call sk->sk_write_space in sock_wfree */
489 SOCK_DBG
, /* %SO_DEBUG setting */
490 SOCK_RCVTSTAMP
, /* %SO_TIMESTAMP setting */
491 SOCK_RCVTSTAMPNS
, /* %SO_TIMESTAMPNS setting */
492 SOCK_LOCALROUTE
, /* route locally only, %SO_DONTROUTE setting */
493 SOCK_QUEUE_SHRUNK
, /* write queue has been shrunk recently */
494 SOCK_TIMESTAMPING_TX_HARDWARE
, /* %SOF_TIMESTAMPING_TX_HARDWARE */
495 SOCK_TIMESTAMPING_TX_SOFTWARE
, /* %SOF_TIMESTAMPING_TX_SOFTWARE */
496 SOCK_TIMESTAMPING_RX_HARDWARE
, /* %SOF_TIMESTAMPING_RX_HARDWARE */
497 SOCK_TIMESTAMPING_RX_SOFTWARE
, /* %SOF_TIMESTAMPING_RX_SOFTWARE */
498 SOCK_TIMESTAMPING_SOFTWARE
, /* %SOF_TIMESTAMPING_SOFTWARE */
499 SOCK_TIMESTAMPING_RAW_HARDWARE
, /* %SOF_TIMESTAMPING_RAW_HARDWARE */
500 SOCK_TIMESTAMPING_SYS_HARDWARE
, /* %SOF_TIMESTAMPING_SYS_HARDWARE */
503 static inline void sock_copy_flags(struct sock
*nsk
, struct sock
*osk
)
505 nsk
->sk_flags
= osk
->sk_flags
;
508 static inline void sock_set_flag(struct sock
*sk
, enum sock_flags flag
)
510 __set_bit(flag
, &sk
->sk_flags
);
513 static inline void sock_reset_flag(struct sock
*sk
, enum sock_flags flag
)
515 __clear_bit(flag
, &sk
->sk_flags
);
518 static inline int sock_flag(struct sock
*sk
, enum sock_flags flag
)
520 return test_bit(flag
, &sk
->sk_flags
);
523 static inline void sk_acceptq_removed(struct sock
*sk
)
525 sk
->sk_ack_backlog
--;
528 static inline void sk_acceptq_added(struct sock
*sk
)
530 sk
->sk_ack_backlog
++;
533 static inline int sk_acceptq_is_full(struct sock
*sk
)
535 return sk
->sk_ack_backlog
> sk
->sk_max_ack_backlog
;
539 * Compute minimal free write space needed to queue new packets.
541 static inline int sk_stream_min_wspace(struct sock
*sk
)
543 return sk
->sk_wmem_queued
>> 1;
546 static inline int sk_stream_wspace(struct sock
*sk
)
548 return sk
->sk_sndbuf
- sk
->sk_wmem_queued
;
551 extern void sk_stream_write_space(struct sock
*sk
);
553 static inline int sk_stream_memory_free(struct sock
*sk
)
555 return sk
->sk_wmem_queued
< sk
->sk_sndbuf
;
558 /* The per-socket spinlock must be held here. */
559 static inline void sk_add_backlog(struct sock
*sk
, struct sk_buff
*skb
)
561 if (!sk
->sk_backlog
.tail
) {
562 sk
->sk_backlog
.head
= sk
->sk_backlog
.tail
= skb
;
564 sk
->sk_backlog
.tail
->next
= skb
;
565 sk
->sk_backlog
.tail
= skb
;
570 static inline int sk_backlog_rcv(struct sock
*sk
, struct sk_buff
*skb
)
572 return sk
->sk_backlog_rcv(sk
, skb
);
575 #define sk_wait_event(__sk, __timeo, __condition) \
577 release_sock(__sk); \
578 __rc = __condition; \
580 *(__timeo) = schedule_timeout(*(__timeo)); \
583 __rc = __condition; \
587 extern int sk_stream_wait_connect(struct sock
*sk
, long *timeo_p
);
588 extern int sk_stream_wait_memory(struct sock
*sk
, long *timeo_p
);
589 extern void sk_stream_wait_close(struct sock
*sk
, long timeo_p
);
590 extern int sk_stream_error(struct sock
*sk
, int flags
, int err
);
591 extern void sk_stream_kill_queues(struct sock
*sk
);
593 extern int sk_wait_data(struct sock
*sk
, long *timeo
);
595 struct request_sock_ops
;
596 struct timewait_sock_ops
;
597 struct inet_hashinfo
;
600 /* Networking protocol blocks we attach to sockets.
601 * socket layer -> transport layer interface
602 * transport -> network interface is defined by struct inet_proto
605 void (*close
)(struct sock
*sk
,
607 int (*connect
)(struct sock
*sk
,
608 struct sockaddr
*uaddr
,
610 int (*disconnect
)(struct sock
*sk
, int flags
);
612 struct sock
* (*accept
) (struct sock
*sk
, int flags
, int *err
);
614 int (*ioctl
)(struct sock
*sk
, int cmd
,
616 int (*init
)(struct sock
*sk
);
617 void (*destroy
)(struct sock
*sk
);
618 void (*shutdown
)(struct sock
*sk
, int how
);
619 int (*setsockopt
)(struct sock
*sk
, int level
,
620 int optname
, char __user
*optval
,
622 int (*getsockopt
)(struct sock
*sk
, int level
,
623 int optname
, char __user
*optval
,
626 int (*compat_setsockopt
)(struct sock
*sk
,
628 int optname
, char __user
*optval
,
630 int (*compat_getsockopt
)(struct sock
*sk
,
632 int optname
, char __user
*optval
,
635 int (*sendmsg
)(struct kiocb
*iocb
, struct sock
*sk
,
636 struct msghdr
*msg
, size_t len
);
637 int (*recvmsg
)(struct kiocb
*iocb
, struct sock
*sk
,
639 size_t len
, int noblock
, int flags
,
641 int (*sendpage
)(struct sock
*sk
, struct page
*page
,
642 int offset
, size_t size
, int flags
);
643 int (*bind
)(struct sock
*sk
,
644 struct sockaddr
*uaddr
, int addr_len
);
646 int (*backlog_rcv
) (struct sock
*sk
,
647 struct sk_buff
*skb
);
649 /* Keeping track of sk's, looking them up, and port selection methods. */
650 void (*hash
)(struct sock
*sk
);
651 void (*unhash
)(struct sock
*sk
);
652 int (*get_port
)(struct sock
*sk
, unsigned short snum
);
654 /* Keeping track of sockets in use */
655 #ifdef CONFIG_PROC_FS
656 unsigned int inuse_idx
;
659 /* Memory pressure */
660 void (*enter_memory_pressure
)(struct sock
*sk
);
661 atomic_t
*memory_allocated
; /* Current allocated memory. */
662 struct percpu_counter
*sockets_allocated
; /* Current number of sockets. */
664 * Pressure flag: try to collapse.
665 * Technical note: it is used by multiple contexts non atomically.
666 * All the __sk_mem_schedule() is of this nature: accounting
667 * is strict, actions are advisory and have some latency.
669 int *memory_pressure
;
675 struct kmem_cache
*slab
;
676 unsigned int obj_size
;
679 struct percpu_counter
*orphan_count
;
681 struct request_sock_ops
*rsk_prot
;
682 struct timewait_sock_ops
*twsk_prot
;
685 struct inet_hashinfo
*hashinfo
;
686 struct udp_table
*udp_table
;
687 struct raw_hashinfo
*raw_hash
;
690 struct module
*owner
;
694 struct list_head node
;
695 #ifdef SOCK_REFCNT_DEBUG
700 extern int proto_register(struct proto
*prot
, int alloc_slab
);
701 extern void proto_unregister(struct proto
*prot
);
703 #ifdef SOCK_REFCNT_DEBUG
704 static inline void sk_refcnt_debug_inc(struct sock
*sk
)
706 atomic_inc(&sk
->sk_prot
->socks
);
709 static inline void sk_refcnt_debug_dec(struct sock
*sk
)
711 atomic_dec(&sk
->sk_prot
->socks
);
712 printk(KERN_DEBUG
"%s socket %p released, %d are still alive\n",
713 sk
->sk_prot
->name
, sk
, atomic_read(&sk
->sk_prot
->socks
));
716 static inline void sk_refcnt_debug_release(const struct sock
*sk
)
718 if (atomic_read(&sk
->sk_refcnt
) != 1)
719 printk(KERN_DEBUG
"Destruction of the %s socket %p delayed, refcnt=%d\n",
720 sk
->sk_prot
->name
, sk
, atomic_read(&sk
->sk_refcnt
));
722 #else /* SOCK_REFCNT_DEBUG */
723 #define sk_refcnt_debug_inc(sk) do { } while (0)
724 #define sk_refcnt_debug_dec(sk) do { } while (0)
725 #define sk_refcnt_debug_release(sk) do { } while (0)
726 #endif /* SOCK_REFCNT_DEBUG */
729 #ifdef CONFIG_PROC_FS
730 /* Called with local bh disabled */
731 extern void sock_prot_inuse_add(struct net
*net
, struct proto
*prot
, int inc
);
732 extern int sock_prot_inuse_get(struct net
*net
, struct proto
*proto
);
734 static void inline sock_prot_inuse_add(struct net
*net
, struct proto
*prot
,
741 /* With per-bucket locks this operation is not-atomic, so that
742 * this version is not worse.
744 static inline void __sk_prot_rehash(struct sock
*sk
)
746 sk
->sk_prot
->unhash(sk
);
747 sk
->sk_prot
->hash(sk
);
750 /* About 10 seconds */
751 #define SOCK_DESTROY_TIME (10*HZ)
753 /* Sockets 0-1023 can't be bound to unless you are superuser */
754 #define PROT_SOCK 1024
756 #define SHUTDOWN_MASK 3
757 #define RCV_SHUTDOWN 1
758 #define SEND_SHUTDOWN 2
760 #define SOCK_SNDBUF_LOCK 1
761 #define SOCK_RCVBUF_LOCK 2
762 #define SOCK_BINDADDR_LOCK 4
763 #define SOCK_BINDPORT_LOCK 8
765 /* sock_iocb: used to kick off async processing of socket ios */
767 struct list_head list
;
773 struct scm_cookie
*scm
;
774 struct msghdr
*msg
, async_msg
;
778 static inline struct sock_iocb
*kiocb_to_siocb(struct kiocb
*iocb
)
780 return (struct sock_iocb
*)iocb
->private;
783 static inline struct kiocb
*siocb_to_kiocb(struct sock_iocb
*si
)
788 struct socket_alloc
{
789 struct socket socket
;
790 struct inode vfs_inode
;
793 static inline struct socket
*SOCKET_I(struct inode
*inode
)
795 return &container_of(inode
, struct socket_alloc
, vfs_inode
)->socket
;
798 static inline struct inode
*SOCK_INODE(struct socket
*socket
)
800 return &container_of(socket
, struct socket_alloc
, socket
)->vfs_inode
;
804 * Functions for memory accounting
806 extern int __sk_mem_schedule(struct sock
*sk
, int size
, int kind
);
807 extern void __sk_mem_reclaim(struct sock
*sk
);
809 #define SK_MEM_QUANTUM ((int)PAGE_SIZE)
810 #define SK_MEM_QUANTUM_SHIFT ilog2(SK_MEM_QUANTUM)
811 #define SK_MEM_SEND 0
812 #define SK_MEM_RECV 1
814 static inline int sk_mem_pages(int amt
)
816 return (amt
+ SK_MEM_QUANTUM
- 1) >> SK_MEM_QUANTUM_SHIFT
;
819 static inline int sk_has_account(struct sock
*sk
)
821 /* return true if protocol supports memory accounting */
822 return !!sk
->sk_prot
->memory_allocated
;
825 static inline int sk_wmem_schedule(struct sock
*sk
, int size
)
827 if (!sk_has_account(sk
))
829 return size
<= sk
->sk_forward_alloc
||
830 __sk_mem_schedule(sk
, size
, SK_MEM_SEND
);
833 static inline int sk_rmem_schedule(struct sock
*sk
, int size
)
835 if (!sk_has_account(sk
))
837 return size
<= sk
->sk_forward_alloc
||
838 __sk_mem_schedule(sk
, size
, SK_MEM_RECV
);
841 static inline void sk_mem_reclaim(struct sock
*sk
)
843 if (!sk_has_account(sk
))
845 if (sk
->sk_forward_alloc
>= SK_MEM_QUANTUM
)
846 __sk_mem_reclaim(sk
);
849 static inline void sk_mem_reclaim_partial(struct sock
*sk
)
851 if (!sk_has_account(sk
))
853 if (sk
->sk_forward_alloc
> SK_MEM_QUANTUM
)
854 __sk_mem_reclaim(sk
);
857 static inline void sk_mem_charge(struct sock
*sk
, int size
)
859 if (!sk_has_account(sk
))
861 sk
->sk_forward_alloc
-= size
;
864 static inline void sk_mem_uncharge(struct sock
*sk
, int size
)
866 if (!sk_has_account(sk
))
868 sk
->sk_forward_alloc
+= size
;
871 static inline void sk_wmem_free_skb(struct sock
*sk
, struct sk_buff
*skb
)
873 sock_set_flag(sk
, SOCK_QUEUE_SHRUNK
);
874 sk
->sk_wmem_queued
-= skb
->truesize
;
875 sk_mem_uncharge(sk
, skb
->truesize
);
879 /* Used by processes to "lock" a socket state, so that
880 * interrupts and bottom half handlers won't change it
881 * from under us. It essentially blocks any incoming
882 * packets, so that we won't get any new data or any
883 * packets that change the state of the socket.
885 * While locked, BH processing will add new packets to
886 * the backlog queue. This queue is processed by the
887 * owner of the socket lock right before it is released.
889 * Since ~2.3.5 it is also exclusive sleep lock serializing
890 * accesses from user process context.
892 #define sock_owned_by_user(sk) ((sk)->sk_lock.owned)
895 * Macro so as to not evaluate some arguments when
896 * lockdep is not enabled.
898 * Mark both the sk_lock and the sk_lock.slock as a
899 * per-address-family lock class.
901 #define sock_lock_init_class_and_name(sk, sname, skey, name, key) \
903 sk->sk_lock.owned = 0; \
904 init_waitqueue_head(&sk->sk_lock.wq); \
905 spin_lock_init(&(sk)->sk_lock.slock); \
906 debug_check_no_locks_freed((void *)&(sk)->sk_lock, \
907 sizeof((sk)->sk_lock)); \
908 lockdep_set_class_and_name(&(sk)->sk_lock.slock, \
910 lockdep_init_map(&(sk)->sk_lock.dep_map, (name), (key), 0); \
913 extern void lock_sock_nested(struct sock
*sk
, int subclass
);
915 static inline void lock_sock(struct sock
*sk
)
917 lock_sock_nested(sk
, 0);
920 extern void release_sock(struct sock
*sk
);
922 /* BH context may only use the following locking interface. */
923 #define bh_lock_sock(__sk) spin_lock(&((__sk)->sk_lock.slock))
924 #define bh_lock_sock_nested(__sk) \
925 spin_lock_nested(&((__sk)->sk_lock.slock), \
926 SINGLE_DEPTH_NESTING)
927 #define bh_unlock_sock(__sk) spin_unlock(&((__sk)->sk_lock.slock))
929 extern struct sock
*sk_alloc(struct net
*net
, int family
,
932 extern void sk_free(struct sock
*sk
);
933 extern void sk_release_kernel(struct sock
*sk
);
934 extern struct sock
*sk_clone(const struct sock
*sk
,
935 const gfp_t priority
);
937 extern struct sk_buff
*sock_wmalloc(struct sock
*sk
,
938 unsigned long size
, int force
,
940 extern struct sk_buff
*sock_rmalloc(struct sock
*sk
,
941 unsigned long size
, int force
,
943 extern void sock_wfree(struct sk_buff
*skb
);
944 extern void sock_rfree(struct sk_buff
*skb
);
946 extern int sock_setsockopt(struct socket
*sock
, int level
,
947 int op
, char __user
*optval
,
950 extern int sock_getsockopt(struct socket
*sock
, int level
,
951 int op
, char __user
*optval
,
953 extern struct sk_buff
*sock_alloc_send_skb(struct sock
*sk
,
957 extern struct sk_buff
*sock_alloc_send_pskb(struct sock
*sk
,
958 unsigned long header_len
,
959 unsigned long data_len
,
962 extern void *sock_kmalloc(struct sock
*sk
, int size
,
964 extern void sock_kfree_s(struct sock
*sk
, void *mem
, int size
);
965 extern void sk_send_sigurg(struct sock
*sk
);
968 * Functions to fill in entries in struct proto_ops when a protocol
969 * does not implement a particular function.
971 extern int sock_no_bind(struct socket
*,
972 struct sockaddr
*, int);
973 extern int sock_no_connect(struct socket
*,
974 struct sockaddr
*, int, int);
975 extern int sock_no_socketpair(struct socket
*,
977 extern int sock_no_accept(struct socket
*,
978 struct socket
*, int);
979 extern int sock_no_getname(struct socket
*,
980 struct sockaddr
*, int *, int);
981 extern unsigned int sock_no_poll(struct file
*, struct socket
*,
982 struct poll_table_struct
*);
983 extern int sock_no_ioctl(struct socket
*, unsigned int,
985 extern int sock_no_listen(struct socket
*, int);
986 extern int sock_no_shutdown(struct socket
*, int);
987 extern int sock_no_getsockopt(struct socket
*, int , int,
988 char __user
*, int __user
*);
989 extern int sock_no_setsockopt(struct socket
*, int, int,
991 extern int sock_no_sendmsg(struct kiocb
*, struct socket
*,
992 struct msghdr
*, size_t);
993 extern int sock_no_recvmsg(struct kiocb
*, struct socket
*,
994 struct msghdr
*, size_t, int);
995 extern int sock_no_mmap(struct file
*file
,
997 struct vm_area_struct
*vma
);
998 extern ssize_t
sock_no_sendpage(struct socket
*sock
,
1000 int offset
, size_t size
,
1004 * Functions to fill in entries in struct proto_ops when a protocol
1005 * uses the inet style.
1007 extern int sock_common_getsockopt(struct socket
*sock
, int level
, int optname
,
1008 char __user
*optval
, int __user
*optlen
);
1009 extern int sock_common_recvmsg(struct kiocb
*iocb
, struct socket
*sock
,
1010 struct msghdr
*msg
, size_t size
, int flags
);
1011 extern int sock_common_setsockopt(struct socket
*sock
, int level
, int optname
,
1012 char __user
*optval
, int optlen
);
1013 extern int compat_sock_common_getsockopt(struct socket
*sock
, int level
,
1014 int optname
, char __user
*optval
, int __user
*optlen
);
1015 extern int compat_sock_common_setsockopt(struct socket
*sock
, int level
,
1016 int optname
, char __user
*optval
, int optlen
);
1018 extern void sk_common_release(struct sock
*sk
);
1021 * Default socket callbacks and setup code
1024 /* Initialise core socket variables */
1025 extern void sock_init_data(struct socket
*sock
, struct sock
*sk
);
1028 * sk_filter_release: Release a socket filter
1029 * @fp: filter to remove
1031 * Remove a filter from a socket and release its resources.
1034 static inline void sk_filter_release(struct sk_filter
*fp
)
1036 if (atomic_dec_and_test(&fp
->refcnt
))
1040 static inline void sk_filter_uncharge(struct sock
*sk
, struct sk_filter
*fp
)
1042 unsigned int size
= sk_filter_len(fp
);
1044 atomic_sub(size
, &sk
->sk_omem_alloc
);
1045 sk_filter_release(fp
);
1048 static inline void sk_filter_charge(struct sock
*sk
, struct sk_filter
*fp
)
1050 atomic_inc(&fp
->refcnt
);
1051 atomic_add(sk_filter_len(fp
), &sk
->sk_omem_alloc
);
1055 * Socket reference counting postulates.
1057 * * Each user of socket SHOULD hold a reference count.
1058 * * Each access point to socket (an hash table bucket, reference from a list,
1059 * running timer, skb in flight MUST hold a reference count.
1060 * * When reference count hits 0, it means it will never increase back.
1061 * * When reference count hits 0, it means that no references from
1062 * outside exist to this socket and current process on current CPU
1063 * is last user and may/should destroy this socket.
1064 * * sk_free is called from any context: process, BH, IRQ. When
1065 * it is called, socket has no references from outside -> sk_free
1066 * may release descendant resources allocated by the socket, but
1067 * to the time when it is called, socket is NOT referenced by any
1068 * hash tables, lists etc.
1069 * * Packets, delivered from outside (from network or from another process)
1070 * and enqueued on receive/error queues SHOULD NOT grab reference count,
1071 * when they sit in queue. Otherwise, packets will leak to hole, when
1072 * socket is looked up by one cpu and unhasing is made by another CPU.
1073 * It is true for udp/raw, netlink (leak to receive and error queues), tcp
1074 * (leak to backlog). Packet socket does all the processing inside
1075 * BR_NETPROTO_LOCK, so that it has not this race condition. UNIX sockets
1076 * use separate SMP lock, so that they are prone too.
1079 /* Ungrab socket and destroy it, if it was the last reference. */
1080 static inline void sock_put(struct sock
*sk
)
1082 if (atomic_dec_and_test(&sk
->sk_refcnt
))
1086 extern int sk_receive_skb(struct sock
*sk
, struct sk_buff
*skb
,
1089 static inline void sk_set_socket(struct sock
*sk
, struct socket
*sock
)
1091 sk
->sk_socket
= sock
;
1094 /* Detach socket from process context.
1095 * Announce socket dead, detach it from wait queue and inode.
1096 * Note that parent inode held reference count on this struct sock,
1097 * we do not release it in this function, because protocol
1098 * probably wants some additional cleanups or even continuing
1099 * to work with this socket (TCP).
1101 static inline void sock_orphan(struct sock
*sk
)
1103 write_lock_bh(&sk
->sk_callback_lock
);
1104 sock_set_flag(sk
, SOCK_DEAD
);
1105 sk_set_socket(sk
, NULL
);
1106 sk
->sk_sleep
= NULL
;
1107 write_unlock_bh(&sk
->sk_callback_lock
);
1110 static inline void sock_graft(struct sock
*sk
, struct socket
*parent
)
1112 write_lock_bh(&sk
->sk_callback_lock
);
1113 sk
->sk_sleep
= &parent
->wait
;
1115 sk_set_socket(sk
, parent
);
1116 security_sock_graft(sk
, parent
);
1117 write_unlock_bh(&sk
->sk_callback_lock
);
1120 extern int sock_i_uid(struct sock
*sk
);
1121 extern unsigned long sock_i_ino(struct sock
*sk
);
1123 static inline struct dst_entry
*
1124 __sk_dst_get(struct sock
*sk
)
1126 return sk
->sk_dst_cache
;
1129 static inline struct dst_entry
*
1130 sk_dst_get(struct sock
*sk
)
1132 struct dst_entry
*dst
;
1134 read_lock(&sk
->sk_dst_lock
);
1135 dst
= sk
->sk_dst_cache
;
1138 read_unlock(&sk
->sk_dst_lock
);
1143 __sk_dst_set(struct sock
*sk
, struct dst_entry
*dst
)
1145 struct dst_entry
*old_dst
;
1147 old_dst
= sk
->sk_dst_cache
;
1148 sk
->sk_dst_cache
= dst
;
1149 dst_release(old_dst
);
1153 sk_dst_set(struct sock
*sk
, struct dst_entry
*dst
)
1155 write_lock(&sk
->sk_dst_lock
);
1156 __sk_dst_set(sk
, dst
);
1157 write_unlock(&sk
->sk_dst_lock
);
1161 __sk_dst_reset(struct sock
*sk
)
1163 struct dst_entry
*old_dst
;
1165 old_dst
= sk
->sk_dst_cache
;
1166 sk
->sk_dst_cache
= NULL
;
1167 dst_release(old_dst
);
1171 sk_dst_reset(struct sock
*sk
)
1173 write_lock(&sk
->sk_dst_lock
);
1175 write_unlock(&sk
->sk_dst_lock
);
1178 extern struct dst_entry
*__sk_dst_check(struct sock
*sk
, u32 cookie
);
1180 extern struct dst_entry
*sk_dst_check(struct sock
*sk
, u32 cookie
);
1182 static inline int sk_can_gso(const struct sock
*sk
)
1184 return net_gso_ok(sk
->sk_route_caps
, sk
->sk_gso_type
);
1187 extern void sk_setup_caps(struct sock
*sk
, struct dst_entry
*dst
);
1189 static inline int skb_copy_to_page(struct sock
*sk
, char __user
*from
,
1190 struct sk_buff
*skb
, struct page
*page
,
1193 if (skb
->ip_summed
== CHECKSUM_NONE
) {
1195 __wsum csum
= csum_and_copy_from_user(from
,
1196 page_address(page
) + off
,
1200 skb
->csum
= csum_block_add(skb
->csum
, csum
, skb
->len
);
1201 } else if (copy_from_user(page_address(page
) + off
, from
, copy
))
1205 skb
->data_len
+= copy
;
1206 skb
->truesize
+= copy
;
1207 sk
->sk_wmem_queued
+= copy
;
1208 sk_mem_charge(sk
, copy
);
1213 * sk_wmem_alloc_get - returns write allocations
1216 * Returns sk_wmem_alloc minus initial offset of one
1218 static inline int sk_wmem_alloc_get(const struct sock
*sk
)
1220 return atomic_read(&sk
->sk_wmem_alloc
) - 1;
1224 * sk_rmem_alloc_get - returns read allocations
1227 * Returns sk_rmem_alloc
1229 static inline int sk_rmem_alloc_get(const struct sock
*sk
)
1231 return atomic_read(&sk
->sk_rmem_alloc
);
1235 * sk_has_allocations - check if allocations are outstanding
1238 * Returns true if socket has write or read allocations
1240 static inline int sk_has_allocations(const struct sock
*sk
)
1242 return sk_wmem_alloc_get(sk
) || sk_rmem_alloc_get(sk
);
1246 * sk_has_sleeper - check if there are any waiting processes
1249 * Returns true if socket has waiting processes
1251 * The purpose of the sk_has_sleeper and sock_poll_wait is to wrap the memory
1252 * barrier call. They were added due to the race found within the tcp code.
1254 * Consider following tcp code paths:
1258 * sys_select receive packet
1260 * __add_wait_queue update tp->rcv_nxt
1262 * tp->rcv_nxt check sock_def_readable
1265 * if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
1266 * wake_up_interruptible(sk->sk_sleep)
1270 * The race for tcp fires when the __add_wait_queue changes done by CPU1 stay
1271 * in its cache, and so does the tp->rcv_nxt update on CPU2 side. The CPU1
1272 * could then endup calling schedule and sleep forever if there are no more
1273 * data on the socket.
1275 * The sk_has_sleeper is always called right after a call to read_lock, so we
1276 * can use smp_mb__after_lock barrier.
1278 static inline int sk_has_sleeper(struct sock
*sk
)
1281 * We need to be sure we are in sync with the
1282 * add_wait_queue modifications to the wait queue.
1284 * This memory barrier is paired in the sock_poll_wait.
1286 smp_mb__after_lock();
1287 return sk
->sk_sleep
&& waitqueue_active(sk
->sk_sleep
);
1291 * sock_poll_wait - place memory barrier behind the poll_wait call.
1293 * @wait_address: socket wait queue
1296 * See the comments in the sk_has_sleeper function.
1298 static inline void sock_poll_wait(struct file
*filp
,
1299 wait_queue_head_t
*wait_address
, poll_table
*p
)
1301 if (p
&& wait_address
) {
1302 poll_wait(filp
, wait_address
, p
);
1304 * We need to be sure we are in sync with the
1305 * socket flags modification.
1307 * This memory barrier is paired in the sk_has_sleeper.
1314 * Queue a received datagram if it will fit. Stream and sequenced
1315 * protocols can't normally use this as they need to fit buffers in
1316 * and play with them.
1318 * Inlined as it's very short and called for pretty much every
1319 * packet ever received.
1322 static inline void skb_set_owner_w(struct sk_buff
*skb
, struct sock
*sk
)
1326 skb
->destructor
= sock_wfree
;
1328 * We used to take a refcount on sk, but following operation
1329 * is enough to guarantee sk_free() wont free this sock until
1330 * all in-flight packets are completed
1332 atomic_add(skb
->truesize
, &sk
->sk_wmem_alloc
);
1335 static inline void skb_set_owner_r(struct sk_buff
*skb
, struct sock
*sk
)
1339 skb
->destructor
= sock_rfree
;
1340 atomic_add(skb
->truesize
, &sk
->sk_rmem_alloc
);
1341 sk_mem_charge(sk
, skb
->truesize
);
1344 extern void sk_reset_timer(struct sock
*sk
, struct timer_list
* timer
,
1345 unsigned long expires
);
1347 extern void sk_stop_timer(struct sock
*sk
, struct timer_list
* timer
);
1349 extern int sock_queue_rcv_skb(struct sock
*sk
, struct sk_buff
*skb
);
1351 static inline int sock_queue_err_skb(struct sock
*sk
, struct sk_buff
*skb
)
1353 /* Cast skb->rcvbuf to unsigned... It's pointless, but reduces
1354 number of warnings when compiling with -W --ANK
1356 if (atomic_read(&sk
->sk_rmem_alloc
) + skb
->truesize
>=
1357 (unsigned)sk
->sk_rcvbuf
)
1359 skb_set_owner_r(skb
, sk
);
1360 skb_queue_tail(&sk
->sk_error_queue
, skb
);
1361 if (!sock_flag(sk
, SOCK_DEAD
))
1362 sk
->sk_data_ready(sk
, skb
->len
);
1367 * Recover an error report and clear atomically
1370 static inline int sock_error(struct sock
*sk
)
1373 if (likely(!sk
->sk_err
))
1375 err
= xchg(&sk
->sk_err
, 0);
1379 static inline unsigned long sock_wspace(struct sock
*sk
)
1383 if (!(sk
->sk_shutdown
& SEND_SHUTDOWN
)) {
1384 amt
= sk
->sk_sndbuf
- atomic_read(&sk
->sk_wmem_alloc
);
1391 static inline void sk_wake_async(struct sock
*sk
, int how
, int band
)
1393 if (sk
->sk_socket
&& sk
->sk_socket
->fasync_list
)
1394 sock_wake_async(sk
->sk_socket
, how
, band
);
1397 #define SOCK_MIN_SNDBUF 2048
1398 #define SOCK_MIN_RCVBUF 256
1400 static inline void sk_stream_moderate_sndbuf(struct sock
*sk
)
1402 if (!(sk
->sk_userlocks
& SOCK_SNDBUF_LOCK
)) {
1403 sk
->sk_sndbuf
= min(sk
->sk_sndbuf
, sk
->sk_wmem_queued
>> 1);
1404 sk
->sk_sndbuf
= max(sk
->sk_sndbuf
, SOCK_MIN_SNDBUF
);
1408 struct sk_buff
*sk_stream_alloc_skb(struct sock
*sk
, int size
, gfp_t gfp
);
1410 static inline struct page
*sk_stream_alloc_page(struct sock
*sk
)
1412 struct page
*page
= NULL
;
1414 page
= alloc_pages(sk
->sk_allocation
, 0);
1416 sk
->sk_prot
->enter_memory_pressure(sk
);
1417 sk_stream_moderate_sndbuf(sk
);
1423 * Default write policy as shown to user space via poll/select/SIGIO
1425 static inline int sock_writeable(const struct sock
*sk
)
1427 return atomic_read(&sk
->sk_wmem_alloc
) < (sk
->sk_sndbuf
>> 1);
1430 static inline gfp_t
gfp_any(void)
1432 return in_softirq() ? GFP_ATOMIC
: GFP_KERNEL
;
1435 static inline long sock_rcvtimeo(const struct sock
*sk
, int noblock
)
1437 return noblock
? 0 : sk
->sk_rcvtimeo
;
1440 static inline long sock_sndtimeo(const struct sock
*sk
, int noblock
)
1442 return noblock
? 0 : sk
->sk_sndtimeo
;
1445 static inline int sock_rcvlowat(const struct sock
*sk
, int waitall
, int len
)
1447 return (waitall
? len
: min_t(int, sk
->sk_rcvlowat
, len
)) ? : 1;
1450 /* Alas, with timeout socket operations are not restartable.
1451 * Compare this to poll().
1453 static inline int sock_intr_errno(long timeo
)
1455 return timeo
== MAX_SCHEDULE_TIMEOUT
? -ERESTARTSYS
: -EINTR
;
1458 extern void __sock_recv_timestamp(struct msghdr
*msg
, struct sock
*sk
,
1459 struct sk_buff
*skb
);
1461 static __inline__
void
1462 sock_recv_timestamp(struct msghdr
*msg
, struct sock
*sk
, struct sk_buff
*skb
)
1464 ktime_t kt
= skb
->tstamp
;
1465 struct skb_shared_hwtstamps
*hwtstamps
= skb_hwtstamps(skb
);
1468 * generate control messages if
1469 * - receive time stamping in software requested (SOCK_RCVTSTAMP
1470 * or SOCK_TIMESTAMPING_RX_SOFTWARE)
1471 * - software time stamp available and wanted
1472 * (SOCK_TIMESTAMPING_SOFTWARE)
1473 * - hardware time stamps available and wanted
1474 * (SOCK_TIMESTAMPING_SYS_HARDWARE or
1475 * SOCK_TIMESTAMPING_RAW_HARDWARE)
1477 if (sock_flag(sk
, SOCK_RCVTSTAMP
) ||
1478 sock_flag(sk
, SOCK_TIMESTAMPING_RX_SOFTWARE
) ||
1479 (kt
.tv64
&& sock_flag(sk
, SOCK_TIMESTAMPING_SOFTWARE
)) ||
1480 (hwtstamps
->hwtstamp
.tv64
&&
1481 sock_flag(sk
, SOCK_TIMESTAMPING_RAW_HARDWARE
)) ||
1482 (hwtstamps
->syststamp
.tv64
&&
1483 sock_flag(sk
, SOCK_TIMESTAMPING_SYS_HARDWARE
)))
1484 __sock_recv_timestamp(msg
, sk
, skb
);
1490 * sock_tx_timestamp - checks whether the outgoing packet is to be time stamped
1491 * @msg: outgoing packet
1492 * @sk: socket sending this packet
1493 * @shtx: filled with instructions for time stamping
1495 * Currently only depends on SOCK_TIMESTAMPING* flags. Returns error code if
1496 * parameters are invalid.
1498 extern int sock_tx_timestamp(struct msghdr
*msg
,
1500 union skb_shared_tx
*shtx
);
1504 * sk_eat_skb - Release a skb if it is no longer needed
1505 * @sk: socket to eat this skb from
1506 * @skb: socket buffer to eat
1507 * @copied_early: flag indicating whether DMA operations copied this data early
1509 * This routine must be called with interrupts disabled or with the socket
1510 * locked so that the sk_buff queue operation is ok.
1512 #ifdef CONFIG_NET_DMA
1513 static inline void sk_eat_skb(struct sock
*sk
, struct sk_buff
*skb
, int copied_early
)
1515 __skb_unlink(skb
, &sk
->sk_receive_queue
);
1519 __skb_queue_tail(&sk
->sk_async_wait_queue
, skb
);
1522 static inline void sk_eat_skb(struct sock
*sk
, struct sk_buff
*skb
, int copied_early
)
1524 __skb_unlink(skb
, &sk
->sk_receive_queue
);
1530 struct net
*sock_net(const struct sock
*sk
)
1532 #ifdef CONFIG_NET_NS
1540 void sock_net_set(struct sock
*sk
, struct net
*net
)
1542 #ifdef CONFIG_NET_NS
1548 * Kernel sockets, f.e. rtnl or icmp_socket, are a part of a namespace.
1549 * They should not hold a referrence to a namespace in order to allow
1551 * Sockets after sk_change_net should be released using sk_release_kernel
1553 static inline void sk_change_net(struct sock
*sk
, struct net
*net
)
1555 put_net(sock_net(sk
));
1556 sock_net_set(sk
, hold_net(net
));
1559 static inline struct sock
*skb_steal_sock(struct sk_buff
*skb
)
1561 if (unlikely(skb
->sk
)) {
1562 struct sock
*sk
= skb
->sk
;
1564 skb
->destructor
= NULL
;
1571 extern void sock_enable_timestamp(struct sock
*sk
, int flag
);
1572 extern int sock_get_timestamp(struct sock
*, struct timeval __user
*);
1573 extern int sock_get_timestampns(struct sock
*, struct timespec __user
*);
1576 * Enable debug/info messages
1578 extern int net_msg_warn
;
1579 #define NETDEBUG(fmt, args...) \
1580 do { if (net_msg_warn) printk(fmt,##args); } while (0)
1582 #define LIMIT_NETDEBUG(fmt, args...) \
1583 do { if (net_msg_warn && net_ratelimit()) printk(fmt,##args); } while(0)
1585 extern __u32 sysctl_wmem_max
;
1586 extern __u32 sysctl_rmem_max
;
1588 extern void sk_init(void);
1590 extern int sysctl_optmem_max
;
1592 extern __u32 sysctl_wmem_default
;
1593 extern __u32 sysctl_rmem_default
;
1595 #endif /* _SOCK_H */