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/hardirq.h>
44 #include <linux/kernel.h>
45 #include <linux/list.h>
46 #include <linux/list_nulls.h>
47 #include <linux/timer.h>
48 #include <linux/cache.h>
49 #include <linux/bitops.h>
50 #include <linux/lockdep.h>
51 #include <linux/netdevice.h>
52 #include <linux/skbuff.h> /* struct sk_buff */
54 #include <linux/security.h>
55 #include <linux/slab.h>
56 #include <linux/uaccess.h>
57 #include <linux/memcontrol.h>
58 #include <linux/res_counter.h>
59 #include <linux/static_key.h>
60 #include <linux/aio.h>
61 #include <linux/sched.h>
63 #include <linux/filter.h>
64 #include <linux/rculist_nulls.h>
65 #include <linux/poll.h>
67 #include <linux/atomic.h>
69 #include <net/checksum.h>
74 int mem_cgroup_sockets_init(struct mem_cgroup
*memcg
, struct cgroup_subsys
*ss
);
75 void mem_cgroup_sockets_destroy(struct mem_cgroup
*memcg
);
78 int mem_cgroup_sockets_init(struct mem_cgroup
*memcg
, struct cgroup_subsys
*ss
)
83 void mem_cgroup_sockets_destroy(struct mem_cgroup
*memcg
)
88 * This structure really needs to be cleaned up.
89 * Most of it is for TCP, and not used by any of
90 * the other protocols.
93 /* Define this to get the SOCK_DBG debugging facility. */
94 #define SOCK_DEBUGGING
96 #define SOCK_DEBUG(sk, msg...) do { if ((sk) && sock_flag((sk), SOCK_DBG)) \
97 printk(KERN_DEBUG msg); } while (0)
99 /* Validate arguments and do nothing */
100 static inline __printf(2, 3)
101 void SOCK_DEBUG(const struct sock
*sk
, const char *msg
, ...)
106 /* This is the per-socket lock. The spinlock provides a synchronization
107 * between user contexts and software interrupt processing, whereas the
108 * mini-semaphore synchronizes multiple users amongst themselves.
113 wait_queue_head_t wq
;
115 * We express the mutex-alike socket_lock semantics
116 * to the lock validator by explicitly managing
117 * the slock as a lock variant (in addition to
120 #ifdef CONFIG_DEBUG_LOCK_ALLOC
121 struct lockdep_map dep_map
;
129 typedef __u32 __bitwise __portpair
;
130 typedef __u64 __bitwise __addrpair
;
133 * struct sock_common - minimal network layer representation of sockets
134 * @skc_daddr: Foreign IPv4 addr
135 * @skc_rcv_saddr: Bound local IPv4 addr
136 * @skc_hash: hash value used with various protocol lookup tables
137 * @skc_u16hashes: two u16 hash values used by UDP lookup tables
138 * @skc_dport: placeholder for inet_dport/tw_dport
139 * @skc_num: placeholder for inet_num/tw_num
140 * @skc_family: network address family
141 * @skc_state: Connection state
142 * @skc_reuse: %SO_REUSEADDR setting
143 * @skc_reuseport: %SO_REUSEPORT setting
144 * @skc_bound_dev_if: bound device index if != 0
145 * @skc_bind_node: bind hash linkage for various protocol lookup tables
146 * @skc_portaddr_node: second hash linkage for UDP/UDP-Lite protocol
147 * @skc_prot: protocol handlers inside a network family
148 * @skc_net: reference to the network namespace of this socket
149 * @skc_node: main hash linkage for various protocol lookup tables
150 * @skc_nulls_node: main hash linkage for TCP/UDP/UDP-Lite protocol
151 * @skc_tx_queue_mapping: tx queue number for this connection
152 * @skc_refcnt: reference count
154 * This is the minimal network layer representation of sockets, the header
155 * for struct sock and struct inet_timewait_sock.
158 /* skc_daddr and skc_rcv_saddr must be grouped on a 8 bytes aligned
159 * address on 64bit arches : cf INET_MATCH()
162 __addrpair skc_addrpair
;
165 __be32 skc_rcv_saddr
;
169 unsigned int skc_hash
;
170 __u16 skc_u16hashes
[2];
172 /* skc_dport && skc_num must be grouped as well */
174 __portpair skc_portpair
;
181 unsigned short skc_family
;
182 volatile unsigned char skc_state
;
183 unsigned char skc_reuse
:4;
184 unsigned char skc_reuseport
:4;
185 int skc_bound_dev_if
;
187 struct hlist_node skc_bind_node
;
188 struct hlist_nulls_node skc_portaddr_node
;
190 struct proto
*skc_prot
;
195 #if IS_ENABLED(CONFIG_IPV6)
196 struct in6_addr skc_v6_daddr
;
197 struct in6_addr skc_v6_rcv_saddr
;
201 * fields between dontcopy_begin/dontcopy_end
202 * are not copied in sock_copy()
205 int skc_dontcopy_begin
[0];
208 struct hlist_node skc_node
;
209 struct hlist_nulls_node skc_nulls_node
;
211 int skc_tx_queue_mapping
;
214 int skc_dontcopy_end
[0];
220 * struct sock - network layer representation of sockets
221 * @__sk_common: shared layout with inet_timewait_sock
222 * @sk_shutdown: mask of %SEND_SHUTDOWN and/or %RCV_SHUTDOWN
223 * @sk_userlocks: %SO_SNDBUF and %SO_RCVBUF settings
224 * @sk_lock: synchronizer
225 * @sk_rcvbuf: size of receive buffer in bytes
226 * @sk_wq: sock wait queue and async head
227 * @sk_rx_dst: receive input route used by early demux
228 * @sk_dst_cache: destination cache
229 * @sk_dst_lock: destination cache lock
230 * @sk_policy: flow policy
231 * @sk_receive_queue: incoming packets
232 * @sk_wmem_alloc: transmit queue bytes committed
233 * @sk_write_queue: Packet sending queue
234 * @sk_async_wait_queue: DMA copied packets
235 * @sk_omem_alloc: "o" is "option" or "other"
236 * @sk_wmem_queued: persistent queue size
237 * @sk_forward_alloc: space allocated forward
238 * @sk_napi_id: id of the last napi context to receive data for sk
239 * @sk_ll_usec: usecs to busypoll when there is no data
240 * @sk_allocation: allocation mode
241 * @sk_pacing_rate: Pacing rate (if supported by transport/packet scheduler)
242 * @sk_max_pacing_rate: Maximum pacing rate (%SO_MAX_PACING_RATE)
243 * @sk_sndbuf: size of send buffer in bytes
244 * @sk_flags: %SO_LINGER (l_onoff), %SO_BROADCAST, %SO_KEEPALIVE,
245 * %SO_OOBINLINE settings, %SO_TIMESTAMPING settings
246 * @sk_no_check_tx: %SO_NO_CHECK setting, set checksum in TX packets
247 * @sk_no_check_rx: allow zero checksum in RX packets
248 * @sk_route_caps: route capabilities (e.g. %NETIF_F_TSO)
249 * @sk_route_nocaps: forbidden route capabilities (e.g NETIF_F_GSO_MASK)
250 * @sk_gso_type: GSO type (e.g. %SKB_GSO_TCPV4)
251 * @sk_gso_max_size: Maximum GSO segment size to build
252 * @sk_gso_max_segs: Maximum number of GSO segments
253 * @sk_lingertime: %SO_LINGER l_linger setting
254 * @sk_backlog: always used with the per-socket spinlock held
255 * @sk_callback_lock: used with the callbacks in the end of this struct
256 * @sk_error_queue: rarely used
257 * @sk_prot_creator: sk_prot of original sock creator (see ipv6_setsockopt,
258 * IPV6_ADDRFORM for instance)
259 * @sk_err: last error
260 * @sk_err_soft: errors that don't cause failure but are the cause of a
261 * persistent failure not just 'timed out'
262 * @sk_drops: raw/udp drops counter
263 * @sk_ack_backlog: current listen backlog
264 * @sk_max_ack_backlog: listen backlog set in listen()
265 * @sk_priority: %SO_PRIORITY setting
266 * @sk_cgrp_prioidx: socket group's priority map index
267 * @sk_type: socket type (%SOCK_STREAM, etc)
268 * @sk_protocol: which protocol this socket belongs in this network family
269 * @sk_peer_pid: &struct pid for this socket's peer
270 * @sk_peer_cred: %SO_PEERCRED setting
271 * @sk_rcvlowat: %SO_RCVLOWAT setting
272 * @sk_rcvtimeo: %SO_RCVTIMEO setting
273 * @sk_sndtimeo: %SO_SNDTIMEO setting
274 * @sk_rxhash: flow hash received from netif layer
275 * @sk_filter: socket filtering instructions
276 * @sk_protinfo: private area, net family specific, when not using slab
277 * @sk_timer: sock cleanup timer
278 * @sk_stamp: time stamp of last packet received
279 * @sk_socket: Identd and reporting IO signals
280 * @sk_user_data: RPC layer private data
281 * @sk_frag: cached page frag
282 * @sk_peek_off: current peek_offset value
283 * @sk_send_head: front of stuff to transmit
284 * @sk_security: used by security modules
285 * @sk_mark: generic packet mark
286 * @sk_classid: this socket's cgroup classid
287 * @sk_cgrp: this socket's cgroup-specific proto data
288 * @sk_write_pending: a write to stream socket waits to start
289 * @sk_state_change: callback to indicate change in the state of the sock
290 * @sk_data_ready: callback to indicate there is data to be processed
291 * @sk_write_space: callback to indicate there is bf sending space available
292 * @sk_error_report: callback to indicate errors (e.g. %MSG_ERRQUEUE)
293 * @sk_backlog_rcv: callback to process the backlog
294 * @sk_destruct: called at sock freeing time, i.e. when all refcnt == 0
298 * Now struct inet_timewait_sock also uses sock_common, so please just
299 * don't add nothing before this first member (__sk_common) --acme
301 struct sock_common __sk_common
;
302 #define sk_node __sk_common.skc_node
303 #define sk_nulls_node __sk_common.skc_nulls_node
304 #define sk_refcnt __sk_common.skc_refcnt
305 #define sk_tx_queue_mapping __sk_common.skc_tx_queue_mapping
307 #define sk_dontcopy_begin __sk_common.skc_dontcopy_begin
308 #define sk_dontcopy_end __sk_common.skc_dontcopy_end
309 #define sk_hash __sk_common.skc_hash
310 #define sk_portpair __sk_common.skc_portpair
311 #define sk_num __sk_common.skc_num
312 #define sk_dport __sk_common.skc_dport
313 #define sk_addrpair __sk_common.skc_addrpair
314 #define sk_daddr __sk_common.skc_daddr
315 #define sk_rcv_saddr __sk_common.skc_rcv_saddr
316 #define sk_family __sk_common.skc_family
317 #define sk_state __sk_common.skc_state
318 #define sk_reuse __sk_common.skc_reuse
319 #define sk_reuseport __sk_common.skc_reuseport
320 #define sk_bound_dev_if __sk_common.skc_bound_dev_if
321 #define sk_bind_node __sk_common.skc_bind_node
322 #define sk_prot __sk_common.skc_prot
323 #define sk_net __sk_common.skc_net
324 #define sk_v6_daddr __sk_common.skc_v6_daddr
325 #define sk_v6_rcv_saddr __sk_common.skc_v6_rcv_saddr
327 socket_lock_t sk_lock
;
328 struct sk_buff_head sk_receive_queue
;
330 * The backlog queue is special, it is always used with
331 * the per-socket spinlock held and requires low latency
332 * access. Therefore we special case it's implementation.
333 * Note : rmem_alloc is in this structure to fill a hole
334 * on 64bit arches, not because its logically part of
340 struct sk_buff
*head
;
341 struct sk_buff
*tail
;
343 #define sk_rmem_alloc sk_backlog.rmem_alloc
344 int sk_forward_alloc
;
348 #ifdef CONFIG_NET_RX_BUSY_POLL
349 unsigned int sk_napi_id
;
350 unsigned int sk_ll_usec
;
355 struct sk_filter __rcu
*sk_filter
;
356 struct socket_wq __rcu
*sk_wq
;
358 #ifdef CONFIG_NET_DMA
359 struct sk_buff_head sk_async_wait_queue
;
363 struct xfrm_policy
*sk_policy
[2];
365 unsigned long sk_flags
;
366 struct dst_entry
*sk_rx_dst
;
367 struct dst_entry __rcu
*sk_dst_cache
;
368 spinlock_t sk_dst_lock
;
369 atomic_t sk_wmem_alloc
;
370 atomic_t sk_omem_alloc
;
372 struct sk_buff_head sk_write_queue
;
373 kmemcheck_bitfield_begin(flags
);
374 unsigned int sk_shutdown
: 2,
380 kmemcheck_bitfield_end(flags
);
383 u32 sk_pacing_rate
; /* bytes per second */
384 u32 sk_max_pacing_rate
;
385 netdev_features_t sk_route_caps
;
386 netdev_features_t sk_route_nocaps
;
388 unsigned int sk_gso_max_size
;
391 unsigned long sk_lingertime
;
392 struct sk_buff_head sk_error_queue
;
393 struct proto
*sk_prot_creator
;
394 rwlock_t sk_callback_lock
;
397 unsigned short sk_ack_backlog
;
398 unsigned short sk_max_ack_backlog
;
400 #if IS_ENABLED(CONFIG_CGROUP_NET_PRIO)
401 __u32 sk_cgrp_prioidx
;
403 struct pid
*sk_peer_pid
;
404 const struct cred
*sk_peer_cred
;
408 struct timer_list sk_timer
;
410 struct socket
*sk_socket
;
412 struct page_frag sk_frag
;
413 struct sk_buff
*sk_send_head
;
415 int sk_write_pending
;
416 #ifdef CONFIG_SECURITY
421 struct cg_proto
*sk_cgrp
;
422 void (*sk_state_change
)(struct sock
*sk
);
423 void (*sk_data_ready
)(struct sock
*sk
);
424 void (*sk_write_space
)(struct sock
*sk
);
425 void (*sk_error_report
)(struct sock
*sk
);
426 int (*sk_backlog_rcv
)(struct sock
*sk
,
427 struct sk_buff
*skb
);
428 void (*sk_destruct
)(struct sock
*sk
);
431 #define __sk_user_data(sk) ((*((void __rcu **)&(sk)->sk_user_data)))
433 #define rcu_dereference_sk_user_data(sk) rcu_dereference(__sk_user_data((sk)))
434 #define rcu_assign_sk_user_data(sk, ptr) rcu_assign_pointer(__sk_user_data((sk)), ptr)
437 * SK_CAN_REUSE and SK_NO_REUSE on a socket mean that the socket is OK
438 * or not whether his port will be reused by someone else. SK_FORCE_REUSE
439 * on a socket means that the socket will reuse everybody else's port
440 * without looking at the other's sk_reuse value.
443 #define SK_NO_REUSE 0
444 #define SK_CAN_REUSE 1
445 #define SK_FORCE_REUSE 2
447 static inline int sk_peek_offset(struct sock
*sk
, int flags
)
449 if ((flags
& MSG_PEEK
) && (sk
->sk_peek_off
>= 0))
450 return sk
->sk_peek_off
;
455 static inline void sk_peek_offset_bwd(struct sock
*sk
, int val
)
457 if (sk
->sk_peek_off
>= 0) {
458 if (sk
->sk_peek_off
>= val
)
459 sk
->sk_peek_off
-= val
;
465 static inline void sk_peek_offset_fwd(struct sock
*sk
, int val
)
467 if (sk
->sk_peek_off
>= 0)
468 sk
->sk_peek_off
+= val
;
472 * Hashed lists helper routines
474 static inline struct sock
*sk_entry(const struct hlist_node
*node
)
476 return hlist_entry(node
, struct sock
, sk_node
);
479 static inline struct sock
*__sk_head(const struct hlist_head
*head
)
481 return hlist_entry(head
->first
, struct sock
, sk_node
);
484 static inline struct sock
*sk_head(const struct hlist_head
*head
)
486 return hlist_empty(head
) ? NULL
: __sk_head(head
);
489 static inline struct sock
*__sk_nulls_head(const struct hlist_nulls_head
*head
)
491 return hlist_nulls_entry(head
->first
, struct sock
, sk_nulls_node
);
494 static inline struct sock
*sk_nulls_head(const struct hlist_nulls_head
*head
)
496 return hlist_nulls_empty(head
) ? NULL
: __sk_nulls_head(head
);
499 static inline struct sock
*sk_next(const struct sock
*sk
)
501 return sk
->sk_node
.next
?
502 hlist_entry(sk
->sk_node
.next
, struct sock
, sk_node
) : NULL
;
505 static inline struct sock
*sk_nulls_next(const struct sock
*sk
)
507 return (!is_a_nulls(sk
->sk_nulls_node
.next
)) ?
508 hlist_nulls_entry(sk
->sk_nulls_node
.next
,
509 struct sock
, sk_nulls_node
) :
513 static inline bool sk_unhashed(const struct sock
*sk
)
515 return hlist_unhashed(&sk
->sk_node
);
518 static inline bool sk_hashed(const struct sock
*sk
)
520 return !sk_unhashed(sk
);
523 static inline void sk_node_init(struct hlist_node
*node
)
528 static inline void sk_nulls_node_init(struct hlist_nulls_node
*node
)
533 static inline void __sk_del_node(struct sock
*sk
)
535 __hlist_del(&sk
->sk_node
);
538 /* NB: equivalent to hlist_del_init_rcu */
539 static inline bool __sk_del_node_init(struct sock
*sk
)
543 sk_node_init(&sk
->sk_node
);
549 /* Grab socket reference count. This operation is valid only
550 when sk is ALREADY grabbed f.e. it is found in hash table
551 or a list and the lookup is made under lock preventing hash table
555 static inline void sock_hold(struct sock
*sk
)
557 atomic_inc(&sk
->sk_refcnt
);
560 /* Ungrab socket in the context, which assumes that socket refcnt
561 cannot hit zero, f.e. it is true in context of any socketcall.
563 static inline void __sock_put(struct sock
*sk
)
565 atomic_dec(&sk
->sk_refcnt
);
568 static inline bool sk_del_node_init(struct sock
*sk
)
570 bool rc
= __sk_del_node_init(sk
);
573 /* paranoid for a while -acme */
574 WARN_ON(atomic_read(&sk
->sk_refcnt
) == 1);
579 #define sk_del_node_init_rcu(sk) sk_del_node_init(sk)
581 static inline bool __sk_nulls_del_node_init_rcu(struct sock
*sk
)
584 hlist_nulls_del_init_rcu(&sk
->sk_nulls_node
);
590 static inline bool sk_nulls_del_node_init_rcu(struct sock
*sk
)
592 bool rc
= __sk_nulls_del_node_init_rcu(sk
);
595 /* paranoid for a while -acme */
596 WARN_ON(atomic_read(&sk
->sk_refcnt
) == 1);
602 static inline void __sk_add_node(struct sock
*sk
, struct hlist_head
*list
)
604 hlist_add_head(&sk
->sk_node
, list
);
607 static inline void sk_add_node(struct sock
*sk
, struct hlist_head
*list
)
610 __sk_add_node(sk
, list
);
613 static inline void sk_add_node_rcu(struct sock
*sk
, struct hlist_head
*list
)
616 hlist_add_head_rcu(&sk
->sk_node
, list
);
619 static inline void __sk_nulls_add_node_rcu(struct sock
*sk
, struct hlist_nulls_head
*list
)
621 hlist_nulls_add_head_rcu(&sk
->sk_nulls_node
, list
);
624 static inline void sk_nulls_add_node_rcu(struct sock
*sk
, struct hlist_nulls_head
*list
)
627 __sk_nulls_add_node_rcu(sk
, list
);
630 static inline void __sk_del_bind_node(struct sock
*sk
)
632 __hlist_del(&sk
->sk_bind_node
);
635 static inline void sk_add_bind_node(struct sock
*sk
,
636 struct hlist_head
*list
)
638 hlist_add_head(&sk
->sk_bind_node
, list
);
641 #define sk_for_each(__sk, list) \
642 hlist_for_each_entry(__sk, list, sk_node)
643 #define sk_for_each_rcu(__sk, list) \
644 hlist_for_each_entry_rcu(__sk, list, sk_node)
645 #define sk_nulls_for_each(__sk, node, list) \
646 hlist_nulls_for_each_entry(__sk, node, list, sk_nulls_node)
647 #define sk_nulls_for_each_rcu(__sk, node, list) \
648 hlist_nulls_for_each_entry_rcu(__sk, node, list, sk_nulls_node)
649 #define sk_for_each_from(__sk) \
650 hlist_for_each_entry_from(__sk, sk_node)
651 #define sk_nulls_for_each_from(__sk, node) \
652 if (__sk && ({ node = &(__sk)->sk_nulls_node; 1; })) \
653 hlist_nulls_for_each_entry_from(__sk, node, sk_nulls_node)
654 #define sk_for_each_safe(__sk, tmp, list) \
655 hlist_for_each_entry_safe(__sk, tmp, list, sk_node)
656 #define sk_for_each_bound(__sk, list) \
657 hlist_for_each_entry(__sk, list, sk_bind_node)
659 static inline struct user_namespace
*sk_user_ns(struct sock
*sk
)
661 /* Careful only use this in a context where these parameters
662 * can not change and must all be valid, such as recvmsg from
665 return sk
->sk_socket
->file
->f_cred
->user_ns
;
679 SOCK_USE_WRITE_QUEUE
, /* whether to call sk->sk_write_space in sock_wfree */
680 SOCK_DBG
, /* %SO_DEBUG setting */
681 SOCK_RCVTSTAMP
, /* %SO_TIMESTAMP setting */
682 SOCK_RCVTSTAMPNS
, /* %SO_TIMESTAMPNS setting */
683 SOCK_LOCALROUTE
, /* route locally only, %SO_DONTROUTE setting */
684 SOCK_QUEUE_SHRUNK
, /* write queue has been shrunk recently */
685 SOCK_MEMALLOC
, /* VM depends on this socket for swapping */
686 SOCK_TIMESTAMPING_TX_HARDWARE
, /* %SOF_TIMESTAMPING_TX_HARDWARE */
687 SOCK_TIMESTAMPING_TX_SOFTWARE
, /* %SOF_TIMESTAMPING_TX_SOFTWARE */
688 SOCK_TIMESTAMPING_RX_HARDWARE
, /* %SOF_TIMESTAMPING_RX_HARDWARE */
689 SOCK_TIMESTAMPING_RX_SOFTWARE
, /* %SOF_TIMESTAMPING_RX_SOFTWARE */
690 SOCK_TIMESTAMPING_SOFTWARE
, /* %SOF_TIMESTAMPING_SOFTWARE */
691 SOCK_TIMESTAMPING_RAW_HARDWARE
, /* %SOF_TIMESTAMPING_RAW_HARDWARE */
692 SOCK_TIMESTAMPING_SYS_HARDWARE
, /* %SOF_TIMESTAMPING_SYS_HARDWARE */
693 SOCK_FASYNC
, /* fasync() active */
695 SOCK_ZEROCOPY
, /* buffers from userspace */
696 SOCK_WIFI_STATUS
, /* push wifi status to userspace */
697 SOCK_NOFCS
, /* Tell NIC not to do the Ethernet FCS.
698 * Will use last 4 bytes of packet sent from
699 * user-space instead.
701 SOCK_FILTER_LOCKED
, /* Filter cannot be changed anymore */
702 SOCK_SELECT_ERR_QUEUE
, /* Wake select on error queue */
705 static inline void sock_copy_flags(struct sock
*nsk
, struct sock
*osk
)
707 nsk
->sk_flags
= osk
->sk_flags
;
710 static inline void sock_set_flag(struct sock
*sk
, enum sock_flags flag
)
712 __set_bit(flag
, &sk
->sk_flags
);
715 static inline void sock_reset_flag(struct sock
*sk
, enum sock_flags flag
)
717 __clear_bit(flag
, &sk
->sk_flags
);
720 static inline bool sock_flag(const struct sock
*sk
, enum sock_flags flag
)
722 return test_bit(flag
, &sk
->sk_flags
);
726 extern struct static_key memalloc_socks
;
727 static inline int sk_memalloc_socks(void)
729 return static_key_false(&memalloc_socks
);
733 static inline int sk_memalloc_socks(void)
740 static inline gfp_t
sk_gfp_atomic(struct sock
*sk
, gfp_t gfp_mask
)
742 return GFP_ATOMIC
| (sk
->sk_allocation
& __GFP_MEMALLOC
);
745 static inline void sk_acceptq_removed(struct sock
*sk
)
747 sk
->sk_ack_backlog
--;
750 static inline void sk_acceptq_added(struct sock
*sk
)
752 sk
->sk_ack_backlog
++;
755 static inline bool sk_acceptq_is_full(const struct sock
*sk
)
757 return sk
->sk_ack_backlog
> sk
->sk_max_ack_backlog
;
761 * Compute minimal free write space needed to queue new packets.
763 static inline int sk_stream_min_wspace(const struct sock
*sk
)
765 return sk
->sk_wmem_queued
>> 1;
768 static inline int sk_stream_wspace(const struct sock
*sk
)
770 return sk
->sk_sndbuf
- sk
->sk_wmem_queued
;
773 void sk_stream_write_space(struct sock
*sk
);
775 /* OOB backlog add */
776 static inline void __sk_add_backlog(struct sock
*sk
, struct sk_buff
*skb
)
778 /* dont let skb dst not refcounted, we are going to leave rcu lock */
781 if (!sk
->sk_backlog
.tail
)
782 sk
->sk_backlog
.head
= skb
;
784 sk
->sk_backlog
.tail
->next
= skb
;
786 sk
->sk_backlog
.tail
= skb
;
791 * Take into account size of receive queue and backlog queue
792 * Do not take into account this skb truesize,
793 * to allow even a single big packet to come.
795 static inline bool sk_rcvqueues_full(const struct sock
*sk
, const struct sk_buff
*skb
,
798 unsigned int qsize
= sk
->sk_backlog
.len
+ atomic_read(&sk
->sk_rmem_alloc
);
800 return qsize
> limit
;
803 /* The per-socket spinlock must be held here. */
804 static inline __must_check
int sk_add_backlog(struct sock
*sk
, struct sk_buff
*skb
,
807 if (sk_rcvqueues_full(sk
, skb
, limit
))
810 __sk_add_backlog(sk
, skb
);
811 sk
->sk_backlog
.len
+= skb
->truesize
;
815 int __sk_backlog_rcv(struct sock
*sk
, struct sk_buff
*skb
);
817 static inline int sk_backlog_rcv(struct sock
*sk
, struct sk_buff
*skb
)
819 if (sk_memalloc_socks() && skb_pfmemalloc(skb
))
820 return __sk_backlog_rcv(sk
, skb
);
822 return sk
->sk_backlog_rcv(sk
, skb
);
825 static inline void sock_rps_record_flow_hash(__u32 hash
)
828 struct rps_sock_flow_table
*sock_flow_table
;
831 sock_flow_table
= rcu_dereference(rps_sock_flow_table
);
832 rps_record_sock_flow(sock_flow_table
, hash
);
837 static inline void sock_rps_reset_flow_hash(__u32 hash
)
840 struct rps_sock_flow_table
*sock_flow_table
;
843 sock_flow_table
= rcu_dereference(rps_sock_flow_table
);
844 rps_reset_sock_flow(sock_flow_table
, hash
);
849 static inline void sock_rps_record_flow(const struct sock
*sk
)
852 sock_rps_record_flow_hash(sk
->sk_rxhash
);
856 static inline void sock_rps_reset_flow(const struct sock
*sk
)
859 sock_rps_reset_flow_hash(sk
->sk_rxhash
);
863 static inline void sock_rps_save_rxhash(struct sock
*sk
,
864 const struct sk_buff
*skb
)
867 if (unlikely(sk
->sk_rxhash
!= skb
->hash
)) {
868 sock_rps_reset_flow(sk
);
869 sk
->sk_rxhash
= skb
->hash
;
874 static inline void sock_rps_reset_rxhash(struct sock
*sk
)
877 sock_rps_reset_flow(sk
);
882 #define sk_wait_event(__sk, __timeo, __condition) \
884 release_sock(__sk); \
885 __rc = __condition; \
887 *(__timeo) = schedule_timeout(*(__timeo)); \
890 __rc = __condition; \
894 int sk_stream_wait_connect(struct sock
*sk
, long *timeo_p
);
895 int sk_stream_wait_memory(struct sock
*sk
, long *timeo_p
);
896 void sk_stream_wait_close(struct sock
*sk
, long timeo_p
);
897 int sk_stream_error(struct sock
*sk
, int flags
, int err
);
898 void sk_stream_kill_queues(struct sock
*sk
);
899 void sk_set_memalloc(struct sock
*sk
);
900 void sk_clear_memalloc(struct sock
*sk
);
902 int sk_wait_data(struct sock
*sk
, long *timeo
);
904 struct request_sock_ops
;
905 struct timewait_sock_ops
;
906 struct inet_hashinfo
;
911 * caches using SLAB_DESTROY_BY_RCU should let .next pointer from nulls nodes
912 * un-modified. Special care is taken when initializing object to zero.
914 static inline void sk_prot_clear_nulls(struct sock
*sk
, int size
)
916 if (offsetof(struct sock
, sk_node
.next
) != 0)
917 memset(sk
, 0, offsetof(struct sock
, sk_node
.next
));
918 memset(&sk
->sk_node
.pprev
, 0,
919 size
- offsetof(struct sock
, sk_node
.pprev
));
922 /* Networking protocol blocks we attach to sockets.
923 * socket layer -> transport layer interface
924 * transport -> network interface is defined by struct inet_proto
927 void (*close
)(struct sock
*sk
,
929 int (*connect
)(struct sock
*sk
,
930 struct sockaddr
*uaddr
,
932 int (*disconnect
)(struct sock
*sk
, int flags
);
934 struct sock
* (*accept
)(struct sock
*sk
, int flags
, int *err
);
936 int (*ioctl
)(struct sock
*sk
, int cmd
,
938 int (*init
)(struct sock
*sk
);
939 void (*destroy
)(struct sock
*sk
);
940 void (*shutdown
)(struct sock
*sk
, int how
);
941 int (*setsockopt
)(struct sock
*sk
, int level
,
942 int optname
, char __user
*optval
,
943 unsigned int optlen
);
944 int (*getsockopt
)(struct sock
*sk
, int level
,
945 int optname
, char __user
*optval
,
948 int (*compat_setsockopt
)(struct sock
*sk
,
950 int optname
, char __user
*optval
,
951 unsigned int optlen
);
952 int (*compat_getsockopt
)(struct sock
*sk
,
954 int optname
, char __user
*optval
,
956 int (*compat_ioctl
)(struct sock
*sk
,
957 unsigned int cmd
, unsigned long arg
);
959 int (*sendmsg
)(struct kiocb
*iocb
, struct sock
*sk
,
960 struct msghdr
*msg
, size_t len
);
961 int (*recvmsg
)(struct kiocb
*iocb
, struct sock
*sk
,
963 size_t len
, int noblock
, int flags
,
965 int (*sendpage
)(struct sock
*sk
, struct page
*page
,
966 int offset
, size_t size
, int flags
);
967 int (*bind
)(struct sock
*sk
,
968 struct sockaddr
*uaddr
, int addr_len
);
970 int (*backlog_rcv
) (struct sock
*sk
,
971 struct sk_buff
*skb
);
973 void (*release_cb
)(struct sock
*sk
);
974 void (*mtu_reduced
)(struct sock
*sk
);
976 /* Keeping track of sk's, looking them up, and port selection methods. */
977 void (*hash
)(struct sock
*sk
);
978 void (*unhash
)(struct sock
*sk
);
979 void (*rehash
)(struct sock
*sk
);
980 int (*get_port
)(struct sock
*sk
, unsigned short snum
);
981 void (*clear_sk
)(struct sock
*sk
, int size
);
983 /* Keeping track of sockets in use */
984 #ifdef CONFIG_PROC_FS
985 unsigned int inuse_idx
;
988 bool (*stream_memory_free
)(const struct sock
*sk
);
989 /* Memory pressure */
990 void (*enter_memory_pressure
)(struct sock
*sk
);
991 atomic_long_t
*memory_allocated
; /* Current allocated memory. */
992 struct percpu_counter
*sockets_allocated
; /* Current number of sockets. */
994 * Pressure flag: try to collapse.
995 * Technical note: it is used by multiple contexts non atomically.
996 * All the __sk_mem_schedule() is of this nature: accounting
997 * is strict, actions are advisory and have some latency.
999 int *memory_pressure
;
1006 struct kmem_cache
*slab
;
1007 unsigned int obj_size
;
1010 struct percpu_counter
*orphan_count
;
1012 struct request_sock_ops
*rsk_prot
;
1013 struct timewait_sock_ops
*twsk_prot
;
1016 struct inet_hashinfo
*hashinfo
;
1017 struct udp_table
*udp_table
;
1018 struct raw_hashinfo
*raw_hash
;
1021 struct module
*owner
;
1025 struct list_head node
;
1026 #ifdef SOCK_REFCNT_DEBUG
1029 #ifdef CONFIG_MEMCG_KMEM
1031 * cgroup specific init/deinit functions. Called once for all
1032 * protocols that implement it, from cgroups populate function.
1033 * This function has to setup any files the protocol want to
1034 * appear in the kmem cgroup filesystem.
1036 int (*init_cgroup
)(struct mem_cgroup
*memcg
,
1037 struct cgroup_subsys
*ss
);
1038 void (*destroy_cgroup
)(struct mem_cgroup
*memcg
);
1039 struct cg_proto
*(*proto_cgroup
)(struct mem_cgroup
*memcg
);
1044 * Bits in struct cg_proto.flags
1046 enum cg_proto_flags
{
1047 /* Currently active and new sockets should be assigned to cgroups */
1049 /* It was ever activated; we must disarm static keys on destruction */
1050 MEMCG_SOCK_ACTIVATED
,
1054 struct res_counter memory_allocated
; /* Current allocated memory. */
1055 struct percpu_counter sockets_allocated
; /* Current number of sockets. */
1056 int memory_pressure
;
1058 unsigned long flags
;
1060 * memcg field is used to find which memcg we belong directly
1061 * Each memcg struct can hold more than one cg_proto, so container_of
1064 * The elegant solution would be having an inverse function to
1065 * proto_cgroup in struct proto, but that means polluting the structure
1066 * for everybody, instead of just for memcg users.
1068 struct mem_cgroup
*memcg
;
1071 int proto_register(struct proto
*prot
, int alloc_slab
);
1072 void proto_unregister(struct proto
*prot
);
1074 static inline bool memcg_proto_active(struct cg_proto
*cg_proto
)
1076 return test_bit(MEMCG_SOCK_ACTIVE
, &cg_proto
->flags
);
1079 static inline bool memcg_proto_activated(struct cg_proto
*cg_proto
)
1081 return test_bit(MEMCG_SOCK_ACTIVATED
, &cg_proto
->flags
);
1084 #ifdef SOCK_REFCNT_DEBUG
1085 static inline void sk_refcnt_debug_inc(struct sock
*sk
)
1087 atomic_inc(&sk
->sk_prot
->socks
);
1090 static inline void sk_refcnt_debug_dec(struct sock
*sk
)
1092 atomic_dec(&sk
->sk_prot
->socks
);
1093 printk(KERN_DEBUG
"%s socket %p released, %d are still alive\n",
1094 sk
->sk_prot
->name
, sk
, atomic_read(&sk
->sk_prot
->socks
));
1097 static inline void sk_refcnt_debug_release(const struct sock
*sk
)
1099 if (atomic_read(&sk
->sk_refcnt
) != 1)
1100 printk(KERN_DEBUG
"Destruction of the %s socket %p delayed, refcnt=%d\n",
1101 sk
->sk_prot
->name
, sk
, atomic_read(&sk
->sk_refcnt
));
1103 #else /* SOCK_REFCNT_DEBUG */
1104 #define sk_refcnt_debug_inc(sk) do { } while (0)
1105 #define sk_refcnt_debug_dec(sk) do { } while (0)
1106 #define sk_refcnt_debug_release(sk) do { } while (0)
1107 #endif /* SOCK_REFCNT_DEBUG */
1109 #if defined(CONFIG_MEMCG_KMEM) && defined(CONFIG_NET)
1110 extern struct static_key memcg_socket_limit_enabled
;
1111 static inline struct cg_proto
*parent_cg_proto(struct proto
*proto
,
1112 struct cg_proto
*cg_proto
)
1114 return proto
->proto_cgroup(parent_mem_cgroup(cg_proto
->memcg
));
1116 #define mem_cgroup_sockets_enabled static_key_false(&memcg_socket_limit_enabled)
1118 #define mem_cgroup_sockets_enabled 0
1119 static inline struct cg_proto
*parent_cg_proto(struct proto
*proto
,
1120 struct cg_proto
*cg_proto
)
1126 static inline bool sk_stream_memory_free(const struct sock
*sk
)
1128 if (sk
->sk_wmem_queued
>= sk
->sk_sndbuf
)
1131 return sk
->sk_prot
->stream_memory_free
?
1132 sk
->sk_prot
->stream_memory_free(sk
) : true;
1135 static inline bool sk_stream_is_writeable(const struct sock
*sk
)
1137 return sk_stream_wspace(sk
) >= sk_stream_min_wspace(sk
) &&
1138 sk_stream_memory_free(sk
);
1142 static inline bool sk_has_memory_pressure(const struct sock
*sk
)
1144 return sk
->sk_prot
->memory_pressure
!= NULL
;
1147 static inline bool sk_under_memory_pressure(const struct sock
*sk
)
1149 if (!sk
->sk_prot
->memory_pressure
)
1152 if (mem_cgroup_sockets_enabled
&& sk
->sk_cgrp
)
1153 return !!sk
->sk_cgrp
->memory_pressure
;
1155 return !!*sk
->sk_prot
->memory_pressure
;
1158 static inline void sk_leave_memory_pressure(struct sock
*sk
)
1160 int *memory_pressure
= sk
->sk_prot
->memory_pressure
;
1162 if (!memory_pressure
)
1165 if (*memory_pressure
)
1166 *memory_pressure
= 0;
1168 if (mem_cgroup_sockets_enabled
&& sk
->sk_cgrp
) {
1169 struct cg_proto
*cg_proto
= sk
->sk_cgrp
;
1170 struct proto
*prot
= sk
->sk_prot
;
1172 for (; cg_proto
; cg_proto
= parent_cg_proto(prot
, cg_proto
))
1173 cg_proto
->memory_pressure
= 0;
1178 static inline void sk_enter_memory_pressure(struct sock
*sk
)
1180 if (!sk
->sk_prot
->enter_memory_pressure
)
1183 if (mem_cgroup_sockets_enabled
&& sk
->sk_cgrp
) {
1184 struct cg_proto
*cg_proto
= sk
->sk_cgrp
;
1185 struct proto
*prot
= sk
->sk_prot
;
1187 for (; cg_proto
; cg_proto
= parent_cg_proto(prot
, cg_proto
))
1188 cg_proto
->memory_pressure
= 1;
1191 sk
->sk_prot
->enter_memory_pressure(sk
);
1194 static inline long sk_prot_mem_limits(const struct sock
*sk
, int index
)
1196 long *prot
= sk
->sk_prot
->sysctl_mem
;
1197 if (mem_cgroup_sockets_enabled
&& sk
->sk_cgrp
)
1198 prot
= sk
->sk_cgrp
->sysctl_mem
;
1202 static inline void memcg_memory_allocated_add(struct cg_proto
*prot
,
1206 struct res_counter
*fail
;
1209 ret
= res_counter_charge_nofail(&prot
->memory_allocated
,
1210 amt
<< PAGE_SHIFT
, &fail
);
1212 *parent_status
= OVER_LIMIT
;
1215 static inline void memcg_memory_allocated_sub(struct cg_proto
*prot
,
1218 res_counter_uncharge(&prot
->memory_allocated
, amt
<< PAGE_SHIFT
);
1221 static inline u64
memcg_memory_allocated_read(struct cg_proto
*prot
)
1224 ret
= res_counter_read_u64(&prot
->memory_allocated
, RES_USAGE
);
1225 return ret
>> PAGE_SHIFT
;
1229 sk_memory_allocated(const struct sock
*sk
)
1231 struct proto
*prot
= sk
->sk_prot
;
1232 if (mem_cgroup_sockets_enabled
&& sk
->sk_cgrp
)
1233 return memcg_memory_allocated_read(sk
->sk_cgrp
);
1235 return atomic_long_read(prot
->memory_allocated
);
1239 sk_memory_allocated_add(struct sock
*sk
, int amt
, int *parent_status
)
1241 struct proto
*prot
= sk
->sk_prot
;
1243 if (mem_cgroup_sockets_enabled
&& sk
->sk_cgrp
) {
1244 memcg_memory_allocated_add(sk
->sk_cgrp
, amt
, parent_status
);
1245 /* update the root cgroup regardless */
1246 atomic_long_add_return(amt
, prot
->memory_allocated
);
1247 return memcg_memory_allocated_read(sk
->sk_cgrp
);
1250 return atomic_long_add_return(amt
, prot
->memory_allocated
);
1254 sk_memory_allocated_sub(struct sock
*sk
, int amt
)
1256 struct proto
*prot
= sk
->sk_prot
;
1258 if (mem_cgroup_sockets_enabled
&& sk
->sk_cgrp
)
1259 memcg_memory_allocated_sub(sk
->sk_cgrp
, amt
);
1261 atomic_long_sub(amt
, prot
->memory_allocated
);
1264 static inline void sk_sockets_allocated_dec(struct sock
*sk
)
1266 struct proto
*prot
= sk
->sk_prot
;
1268 if (mem_cgroup_sockets_enabled
&& sk
->sk_cgrp
) {
1269 struct cg_proto
*cg_proto
= sk
->sk_cgrp
;
1271 for (; cg_proto
; cg_proto
= parent_cg_proto(prot
, cg_proto
))
1272 percpu_counter_dec(&cg_proto
->sockets_allocated
);
1275 percpu_counter_dec(prot
->sockets_allocated
);
1278 static inline void sk_sockets_allocated_inc(struct sock
*sk
)
1280 struct proto
*prot
= sk
->sk_prot
;
1282 if (mem_cgroup_sockets_enabled
&& sk
->sk_cgrp
) {
1283 struct cg_proto
*cg_proto
= sk
->sk_cgrp
;
1285 for (; cg_proto
; cg_proto
= parent_cg_proto(prot
, cg_proto
))
1286 percpu_counter_inc(&cg_proto
->sockets_allocated
);
1289 percpu_counter_inc(prot
->sockets_allocated
);
1293 sk_sockets_allocated_read_positive(struct sock
*sk
)
1295 struct proto
*prot
= sk
->sk_prot
;
1297 if (mem_cgroup_sockets_enabled
&& sk
->sk_cgrp
)
1298 return percpu_counter_read_positive(&sk
->sk_cgrp
->sockets_allocated
);
1300 return percpu_counter_read_positive(prot
->sockets_allocated
);
1304 proto_sockets_allocated_sum_positive(struct proto
*prot
)
1306 return percpu_counter_sum_positive(prot
->sockets_allocated
);
1310 proto_memory_allocated(struct proto
*prot
)
1312 return atomic_long_read(prot
->memory_allocated
);
1316 proto_memory_pressure(struct proto
*prot
)
1318 if (!prot
->memory_pressure
)
1320 return !!*prot
->memory_pressure
;
1324 #ifdef CONFIG_PROC_FS
1325 /* Called with local bh disabled */
1326 void sock_prot_inuse_add(struct net
*net
, struct proto
*prot
, int inc
);
1327 int sock_prot_inuse_get(struct net
*net
, struct proto
*proto
);
1329 static inline void sock_prot_inuse_add(struct net
*net
, struct proto
*prot
,
1336 /* With per-bucket locks this operation is not-atomic, so that
1337 * this version is not worse.
1339 static inline void __sk_prot_rehash(struct sock
*sk
)
1341 sk
->sk_prot
->unhash(sk
);
1342 sk
->sk_prot
->hash(sk
);
1345 void sk_prot_clear_portaddr_nulls(struct sock
*sk
, int size
);
1347 /* About 10 seconds */
1348 #define SOCK_DESTROY_TIME (10*HZ)
1350 /* Sockets 0-1023 can't be bound to unless you are superuser */
1351 #define PROT_SOCK 1024
1353 #define SHUTDOWN_MASK 3
1354 #define RCV_SHUTDOWN 1
1355 #define SEND_SHUTDOWN 2
1357 #define SOCK_SNDBUF_LOCK 1
1358 #define SOCK_RCVBUF_LOCK 2
1359 #define SOCK_BINDADDR_LOCK 4
1360 #define SOCK_BINDPORT_LOCK 8
1362 /* sock_iocb: used to kick off async processing of socket ios */
1364 struct list_head list
;
1368 struct socket
*sock
;
1370 struct scm_cookie
*scm
;
1371 struct msghdr
*msg
, async_msg
;
1372 struct kiocb
*kiocb
;
1375 static inline struct sock_iocb
*kiocb_to_siocb(struct kiocb
*iocb
)
1377 return (struct sock_iocb
*)iocb
->private;
1380 static inline struct kiocb
*siocb_to_kiocb(struct sock_iocb
*si
)
1385 struct socket_alloc
{
1386 struct socket socket
;
1387 struct inode vfs_inode
;
1390 static inline struct socket
*SOCKET_I(struct inode
*inode
)
1392 return &container_of(inode
, struct socket_alloc
, vfs_inode
)->socket
;
1395 static inline struct inode
*SOCK_INODE(struct socket
*socket
)
1397 return &container_of(socket
, struct socket_alloc
, socket
)->vfs_inode
;
1401 * Functions for memory accounting
1403 int __sk_mem_schedule(struct sock
*sk
, int size
, int kind
);
1404 void __sk_mem_reclaim(struct sock
*sk
);
1406 #define SK_MEM_QUANTUM ((int)PAGE_SIZE)
1407 #define SK_MEM_QUANTUM_SHIFT ilog2(SK_MEM_QUANTUM)
1408 #define SK_MEM_SEND 0
1409 #define SK_MEM_RECV 1
1411 static inline int sk_mem_pages(int amt
)
1413 return (amt
+ SK_MEM_QUANTUM
- 1) >> SK_MEM_QUANTUM_SHIFT
;
1416 static inline bool sk_has_account(struct sock
*sk
)
1418 /* return true if protocol supports memory accounting */
1419 return !!sk
->sk_prot
->memory_allocated
;
1422 static inline bool sk_wmem_schedule(struct sock
*sk
, int size
)
1424 if (!sk_has_account(sk
))
1426 return size
<= sk
->sk_forward_alloc
||
1427 __sk_mem_schedule(sk
, size
, SK_MEM_SEND
);
1431 sk_rmem_schedule(struct sock
*sk
, struct sk_buff
*skb
, int size
)
1433 if (!sk_has_account(sk
))
1435 return size
<= sk
->sk_forward_alloc
||
1436 __sk_mem_schedule(sk
, size
, SK_MEM_RECV
) ||
1437 skb_pfmemalloc(skb
);
1440 static inline void sk_mem_reclaim(struct sock
*sk
)
1442 if (!sk_has_account(sk
))
1444 if (sk
->sk_forward_alloc
>= SK_MEM_QUANTUM
)
1445 __sk_mem_reclaim(sk
);
1448 static inline void sk_mem_reclaim_partial(struct sock
*sk
)
1450 if (!sk_has_account(sk
))
1452 if (sk
->sk_forward_alloc
> SK_MEM_QUANTUM
)
1453 __sk_mem_reclaim(sk
);
1456 static inline void sk_mem_charge(struct sock
*sk
, int size
)
1458 if (!sk_has_account(sk
))
1460 sk
->sk_forward_alloc
-= size
;
1463 static inline void sk_mem_uncharge(struct sock
*sk
, int size
)
1465 if (!sk_has_account(sk
))
1467 sk
->sk_forward_alloc
+= size
;
1470 static inline void sk_wmem_free_skb(struct sock
*sk
, struct sk_buff
*skb
)
1472 sock_set_flag(sk
, SOCK_QUEUE_SHRUNK
);
1473 sk
->sk_wmem_queued
-= skb
->truesize
;
1474 sk_mem_uncharge(sk
, skb
->truesize
);
1478 /* Used by processes to "lock" a socket state, so that
1479 * interrupts and bottom half handlers won't change it
1480 * from under us. It essentially blocks any incoming
1481 * packets, so that we won't get any new data or any
1482 * packets that change the state of the socket.
1484 * While locked, BH processing will add new packets to
1485 * the backlog queue. This queue is processed by the
1486 * owner of the socket lock right before it is released.
1488 * Since ~2.3.5 it is also exclusive sleep lock serializing
1489 * accesses from user process context.
1491 #define sock_owned_by_user(sk) ((sk)->sk_lock.owned)
1493 static inline void sock_release_ownership(struct sock
*sk
)
1495 sk
->sk_lock
.owned
= 0;
1499 * Macro so as to not evaluate some arguments when
1500 * lockdep is not enabled.
1502 * Mark both the sk_lock and the sk_lock.slock as a
1503 * per-address-family lock class.
1505 #define sock_lock_init_class_and_name(sk, sname, skey, name, key) \
1507 sk->sk_lock.owned = 0; \
1508 init_waitqueue_head(&sk->sk_lock.wq); \
1509 spin_lock_init(&(sk)->sk_lock.slock); \
1510 debug_check_no_locks_freed((void *)&(sk)->sk_lock, \
1511 sizeof((sk)->sk_lock)); \
1512 lockdep_set_class_and_name(&(sk)->sk_lock.slock, \
1514 lockdep_init_map(&(sk)->sk_lock.dep_map, (name), (key), 0); \
1517 void lock_sock_nested(struct sock
*sk
, int subclass
);
1519 static inline void lock_sock(struct sock
*sk
)
1521 lock_sock_nested(sk
, 0);
1524 void release_sock(struct sock
*sk
);
1526 /* BH context may only use the following locking interface. */
1527 #define bh_lock_sock(__sk) spin_lock(&((__sk)->sk_lock.slock))
1528 #define bh_lock_sock_nested(__sk) \
1529 spin_lock_nested(&((__sk)->sk_lock.slock), \
1530 SINGLE_DEPTH_NESTING)
1531 #define bh_unlock_sock(__sk) spin_unlock(&((__sk)->sk_lock.slock))
1533 bool lock_sock_fast(struct sock
*sk
);
1535 * unlock_sock_fast - complement of lock_sock_fast
1539 * fast unlock socket for user context.
1540 * If slow mode is on, we call regular release_sock()
1542 static inline void unlock_sock_fast(struct sock
*sk
, bool slow
)
1547 spin_unlock_bh(&sk
->sk_lock
.slock
);
1551 struct sock
*sk_alloc(struct net
*net
, int family
, gfp_t priority
,
1552 struct proto
*prot
);
1553 void sk_free(struct sock
*sk
);
1554 void sk_release_kernel(struct sock
*sk
);
1555 struct sock
*sk_clone_lock(const struct sock
*sk
, const gfp_t priority
);
1557 struct sk_buff
*sock_wmalloc(struct sock
*sk
, unsigned long size
, int force
,
1559 void sock_wfree(struct sk_buff
*skb
);
1560 void skb_orphan_partial(struct sk_buff
*skb
);
1561 void sock_rfree(struct sk_buff
*skb
);
1562 void sock_edemux(struct sk_buff
*skb
);
1564 int sock_setsockopt(struct socket
*sock
, int level
, int op
,
1565 char __user
*optval
, unsigned int optlen
);
1567 int sock_getsockopt(struct socket
*sock
, int level
, int op
,
1568 char __user
*optval
, int __user
*optlen
);
1569 struct sk_buff
*sock_alloc_send_skb(struct sock
*sk
, unsigned long size
,
1570 int noblock
, int *errcode
);
1571 struct sk_buff
*sock_alloc_send_pskb(struct sock
*sk
, unsigned long header_len
,
1572 unsigned long data_len
, int noblock
,
1573 int *errcode
, int max_page_order
);
1574 void *sock_kmalloc(struct sock
*sk
, int size
, gfp_t priority
);
1575 void sock_kfree_s(struct sock
*sk
, void *mem
, int size
);
1576 void sk_send_sigurg(struct sock
*sk
);
1579 * Functions to fill in entries in struct proto_ops when a protocol
1580 * does not implement a particular function.
1582 int sock_no_bind(struct socket
*, struct sockaddr
*, int);
1583 int sock_no_connect(struct socket
*, struct sockaddr
*, int, int);
1584 int sock_no_socketpair(struct socket
*, struct socket
*);
1585 int sock_no_accept(struct socket
*, struct socket
*, int);
1586 int sock_no_getname(struct socket
*, struct sockaddr
*, int *, int);
1587 unsigned int sock_no_poll(struct file
*, struct socket
*,
1588 struct poll_table_struct
*);
1589 int sock_no_ioctl(struct socket
*, unsigned int, unsigned long);
1590 int sock_no_listen(struct socket
*, int);
1591 int sock_no_shutdown(struct socket
*, int);
1592 int sock_no_getsockopt(struct socket
*, int , int, char __user
*, int __user
*);
1593 int sock_no_setsockopt(struct socket
*, int, int, char __user
*, unsigned int);
1594 int sock_no_sendmsg(struct kiocb
*, struct socket
*, struct msghdr
*, size_t);
1595 int sock_no_recvmsg(struct kiocb
*, struct socket
*, struct msghdr
*, size_t,
1597 int sock_no_mmap(struct file
*file
, struct socket
*sock
,
1598 struct vm_area_struct
*vma
);
1599 ssize_t
sock_no_sendpage(struct socket
*sock
, struct page
*page
, int offset
,
1600 size_t size
, int flags
);
1603 * Functions to fill in entries in struct proto_ops when a protocol
1604 * uses the inet style.
1606 int sock_common_getsockopt(struct socket
*sock
, int level
, int optname
,
1607 char __user
*optval
, int __user
*optlen
);
1608 int sock_common_recvmsg(struct kiocb
*iocb
, struct socket
*sock
,
1609 struct msghdr
*msg
, size_t size
, int flags
);
1610 int sock_common_setsockopt(struct socket
*sock
, int level
, int optname
,
1611 char __user
*optval
, unsigned int optlen
);
1612 int compat_sock_common_getsockopt(struct socket
*sock
, int level
,
1613 int optname
, char __user
*optval
, int __user
*optlen
);
1614 int compat_sock_common_setsockopt(struct socket
*sock
, int level
,
1615 int optname
, char __user
*optval
, unsigned int optlen
);
1617 void sk_common_release(struct sock
*sk
);
1620 * Default socket callbacks and setup code
1623 /* Initialise core socket variables */
1624 void sock_init_data(struct socket
*sock
, struct sock
*sk
);
1627 * Socket reference counting postulates.
1629 * * Each user of socket SHOULD hold a reference count.
1630 * * Each access point to socket (an hash table bucket, reference from a list,
1631 * running timer, skb in flight MUST hold a reference count.
1632 * * When reference count hits 0, it means it will never increase back.
1633 * * When reference count hits 0, it means that no references from
1634 * outside exist to this socket and current process on current CPU
1635 * is last user and may/should destroy this socket.
1636 * * sk_free is called from any context: process, BH, IRQ. When
1637 * it is called, socket has no references from outside -> sk_free
1638 * may release descendant resources allocated by the socket, but
1639 * to the time when it is called, socket is NOT referenced by any
1640 * hash tables, lists etc.
1641 * * Packets, delivered from outside (from network or from another process)
1642 * and enqueued on receive/error queues SHOULD NOT grab reference count,
1643 * when they sit in queue. Otherwise, packets will leak to hole, when
1644 * socket is looked up by one cpu and unhasing is made by another CPU.
1645 * It is true for udp/raw, netlink (leak to receive and error queues), tcp
1646 * (leak to backlog). Packet socket does all the processing inside
1647 * BR_NETPROTO_LOCK, so that it has not this race condition. UNIX sockets
1648 * use separate SMP lock, so that they are prone too.
1651 /* Ungrab socket and destroy it, if it was the last reference. */
1652 static inline void sock_put(struct sock
*sk
)
1654 if (atomic_dec_and_test(&sk
->sk_refcnt
))
1657 /* Generic version of sock_put(), dealing with all sockets
1658 * (TCP_TIMEWAIT, ESTABLISHED...)
1660 void sock_gen_put(struct sock
*sk
);
1662 int sk_receive_skb(struct sock
*sk
, struct sk_buff
*skb
, const int nested
);
1664 static inline void sk_tx_queue_set(struct sock
*sk
, int tx_queue
)
1666 sk
->sk_tx_queue_mapping
= tx_queue
;
1669 static inline void sk_tx_queue_clear(struct sock
*sk
)
1671 sk
->sk_tx_queue_mapping
= -1;
1674 static inline int sk_tx_queue_get(const struct sock
*sk
)
1676 return sk
? sk
->sk_tx_queue_mapping
: -1;
1679 static inline void sk_set_socket(struct sock
*sk
, struct socket
*sock
)
1681 sk_tx_queue_clear(sk
);
1682 sk
->sk_socket
= sock
;
1685 static inline wait_queue_head_t
*sk_sleep(struct sock
*sk
)
1687 BUILD_BUG_ON(offsetof(struct socket_wq
, wait
) != 0);
1688 return &rcu_dereference_raw(sk
->sk_wq
)->wait
;
1690 /* Detach socket from process context.
1691 * Announce socket dead, detach it from wait queue and inode.
1692 * Note that parent inode held reference count on this struct sock,
1693 * we do not release it in this function, because protocol
1694 * probably wants some additional cleanups or even continuing
1695 * to work with this socket (TCP).
1697 static inline void sock_orphan(struct sock
*sk
)
1699 write_lock_bh(&sk
->sk_callback_lock
);
1700 sock_set_flag(sk
, SOCK_DEAD
);
1701 sk_set_socket(sk
, NULL
);
1703 write_unlock_bh(&sk
->sk_callback_lock
);
1706 static inline void sock_graft(struct sock
*sk
, struct socket
*parent
)
1708 write_lock_bh(&sk
->sk_callback_lock
);
1709 sk
->sk_wq
= parent
->wq
;
1711 sk_set_socket(sk
, parent
);
1712 security_sock_graft(sk
, parent
);
1713 write_unlock_bh(&sk
->sk_callback_lock
);
1716 kuid_t
sock_i_uid(struct sock
*sk
);
1717 unsigned long sock_i_ino(struct sock
*sk
);
1719 static inline struct dst_entry
*
1720 __sk_dst_get(struct sock
*sk
)
1722 return rcu_dereference_check(sk
->sk_dst_cache
, sock_owned_by_user(sk
) ||
1723 lockdep_is_held(&sk
->sk_lock
.slock
));
1726 static inline struct dst_entry
*
1727 sk_dst_get(struct sock
*sk
)
1729 struct dst_entry
*dst
;
1732 dst
= rcu_dereference(sk
->sk_dst_cache
);
1733 if (dst
&& !atomic_inc_not_zero(&dst
->__refcnt
))
1739 static inline void dst_negative_advice(struct sock
*sk
)
1741 struct dst_entry
*ndst
, *dst
= __sk_dst_get(sk
);
1743 if (dst
&& dst
->ops
->negative_advice
) {
1744 ndst
= dst
->ops
->negative_advice(dst
);
1747 rcu_assign_pointer(sk
->sk_dst_cache
, ndst
);
1748 sk_tx_queue_clear(sk
);
1754 __sk_dst_set(struct sock
*sk
, struct dst_entry
*dst
)
1756 struct dst_entry
*old_dst
;
1758 sk_tx_queue_clear(sk
);
1760 * This can be called while sk is owned by the caller only,
1761 * with no state that can be checked in a rcu_dereference_check() cond
1763 old_dst
= rcu_dereference_raw(sk
->sk_dst_cache
);
1764 rcu_assign_pointer(sk
->sk_dst_cache
, dst
);
1765 dst_release(old_dst
);
1769 sk_dst_set(struct sock
*sk
, struct dst_entry
*dst
)
1771 struct dst_entry
*old_dst
;
1773 sk_tx_queue_clear(sk
);
1774 old_dst
= xchg((__force
struct dst_entry
**)&sk
->sk_dst_cache
, dst
);
1775 dst_release(old_dst
);
1779 __sk_dst_reset(struct sock
*sk
)
1781 __sk_dst_set(sk
, NULL
);
1785 sk_dst_reset(struct sock
*sk
)
1787 sk_dst_set(sk
, NULL
);
1790 struct dst_entry
*__sk_dst_check(struct sock
*sk
, u32 cookie
);
1792 struct dst_entry
*sk_dst_check(struct sock
*sk
, u32 cookie
);
1794 static inline bool sk_can_gso(const struct sock
*sk
)
1796 return net_gso_ok(sk
->sk_route_caps
, sk
->sk_gso_type
);
1799 void sk_setup_caps(struct sock
*sk
, struct dst_entry
*dst
);
1801 static inline void sk_nocaps_add(struct sock
*sk
, netdev_features_t flags
)
1803 sk
->sk_route_nocaps
|= flags
;
1804 sk
->sk_route_caps
&= ~flags
;
1807 static inline int skb_do_copy_data_nocache(struct sock
*sk
, struct sk_buff
*skb
,
1808 char __user
*from
, char *to
,
1809 int copy
, int offset
)
1811 if (skb
->ip_summed
== CHECKSUM_NONE
) {
1813 __wsum csum
= csum_and_copy_from_user(from
, to
, copy
, 0, &err
);
1816 skb
->csum
= csum_block_add(skb
->csum
, csum
, offset
);
1817 } else if (sk
->sk_route_caps
& NETIF_F_NOCACHE_COPY
) {
1818 if (!access_ok(VERIFY_READ
, from
, copy
) ||
1819 __copy_from_user_nocache(to
, from
, copy
))
1821 } else if (copy_from_user(to
, from
, copy
))
1827 static inline int skb_add_data_nocache(struct sock
*sk
, struct sk_buff
*skb
,
1828 char __user
*from
, int copy
)
1830 int err
, offset
= skb
->len
;
1832 err
= skb_do_copy_data_nocache(sk
, skb
, from
, skb_put(skb
, copy
),
1835 __skb_trim(skb
, offset
);
1840 static inline int skb_copy_to_page_nocache(struct sock
*sk
, char __user
*from
,
1841 struct sk_buff
*skb
,
1847 err
= skb_do_copy_data_nocache(sk
, skb
, from
, page_address(page
) + off
,
1853 skb
->data_len
+= copy
;
1854 skb
->truesize
+= copy
;
1855 sk
->sk_wmem_queued
+= copy
;
1856 sk_mem_charge(sk
, copy
);
1860 static inline int skb_copy_to_page(struct sock
*sk
, char __user
*from
,
1861 struct sk_buff
*skb
, struct page
*page
,
1864 if (skb
->ip_summed
== CHECKSUM_NONE
) {
1866 __wsum csum
= csum_and_copy_from_user(from
,
1867 page_address(page
) + off
,
1871 skb
->csum
= csum_block_add(skb
->csum
, csum
, skb
->len
);
1872 } else if (copy_from_user(page_address(page
) + off
, from
, copy
))
1876 skb
->data_len
+= copy
;
1877 skb
->truesize
+= copy
;
1878 sk
->sk_wmem_queued
+= copy
;
1879 sk_mem_charge(sk
, copy
);
1884 * sk_wmem_alloc_get - returns write allocations
1887 * Returns sk_wmem_alloc minus initial offset of one
1889 static inline int sk_wmem_alloc_get(const struct sock
*sk
)
1891 return atomic_read(&sk
->sk_wmem_alloc
) - 1;
1895 * sk_rmem_alloc_get - returns read allocations
1898 * Returns sk_rmem_alloc
1900 static inline int sk_rmem_alloc_get(const struct sock
*sk
)
1902 return atomic_read(&sk
->sk_rmem_alloc
);
1906 * sk_has_allocations - check if allocations are outstanding
1909 * Returns true if socket has write or read allocations
1911 static inline bool sk_has_allocations(const struct sock
*sk
)
1913 return sk_wmem_alloc_get(sk
) || sk_rmem_alloc_get(sk
);
1917 * wq_has_sleeper - check if there are any waiting processes
1918 * @wq: struct socket_wq
1920 * Returns true if socket_wq has waiting processes
1922 * The purpose of the wq_has_sleeper and sock_poll_wait is to wrap the memory
1923 * barrier call. They were added due to the race found within the tcp code.
1925 * Consider following tcp code paths:
1929 * sys_select receive packet
1931 * __add_wait_queue update tp->rcv_nxt
1933 * tp->rcv_nxt check sock_def_readable
1935 * schedule rcu_read_lock();
1936 * wq = rcu_dereference(sk->sk_wq);
1937 * if (wq && waitqueue_active(&wq->wait))
1938 * wake_up_interruptible(&wq->wait)
1942 * The race for tcp fires when the __add_wait_queue changes done by CPU1 stay
1943 * in its cache, and so does the tp->rcv_nxt update on CPU2 side. The CPU1
1944 * could then endup calling schedule and sleep forever if there are no more
1945 * data on the socket.
1948 static inline bool wq_has_sleeper(struct socket_wq
*wq
)
1950 /* We need to be sure we are in sync with the
1951 * add_wait_queue modifications to the wait queue.
1953 * This memory barrier is paired in the sock_poll_wait.
1956 return wq
&& waitqueue_active(&wq
->wait
);
1960 * sock_poll_wait - place memory barrier behind the poll_wait call.
1962 * @wait_address: socket wait queue
1965 * See the comments in the wq_has_sleeper function.
1967 static inline void sock_poll_wait(struct file
*filp
,
1968 wait_queue_head_t
*wait_address
, poll_table
*p
)
1970 if (!poll_does_not_wait(p
) && wait_address
) {
1971 poll_wait(filp
, wait_address
, p
);
1972 /* We need to be sure we are in sync with the
1973 * socket flags modification.
1975 * This memory barrier is paired in the wq_has_sleeper.
1982 * Queue a received datagram if it will fit. Stream and sequenced
1983 * protocols can't normally use this as they need to fit buffers in
1984 * and play with them.
1986 * Inlined as it's very short and called for pretty much every
1987 * packet ever received.
1990 static inline void skb_set_owner_w(struct sk_buff
*skb
, struct sock
*sk
)
1994 skb
->destructor
= sock_wfree
;
1996 * We used to take a refcount on sk, but following operation
1997 * is enough to guarantee sk_free() wont free this sock until
1998 * all in-flight packets are completed
2000 atomic_add(skb
->truesize
, &sk
->sk_wmem_alloc
);
2003 static inline void skb_set_owner_r(struct sk_buff
*skb
, struct sock
*sk
)
2007 skb
->destructor
= sock_rfree
;
2008 atomic_add(skb
->truesize
, &sk
->sk_rmem_alloc
);
2009 sk_mem_charge(sk
, skb
->truesize
);
2012 void sk_reset_timer(struct sock
*sk
, struct timer_list
*timer
,
2013 unsigned long expires
);
2015 void sk_stop_timer(struct sock
*sk
, struct timer_list
*timer
);
2017 int sock_queue_rcv_skb(struct sock
*sk
, struct sk_buff
*skb
);
2019 int sock_queue_err_skb(struct sock
*sk
, struct sk_buff
*skb
);
2022 * Recover an error report and clear atomically
2025 static inline int sock_error(struct sock
*sk
)
2028 if (likely(!sk
->sk_err
))
2030 err
= xchg(&sk
->sk_err
, 0);
2034 static inline unsigned long sock_wspace(struct sock
*sk
)
2038 if (!(sk
->sk_shutdown
& SEND_SHUTDOWN
)) {
2039 amt
= sk
->sk_sndbuf
- atomic_read(&sk
->sk_wmem_alloc
);
2046 static inline void sk_wake_async(struct sock
*sk
, int how
, int band
)
2048 if (sock_flag(sk
, SOCK_FASYNC
))
2049 sock_wake_async(sk
->sk_socket
, how
, band
);
2052 /* Since sk_{r,w}mem_alloc sums skb->truesize, even a small frame might
2053 * need sizeof(sk_buff) + MTU + padding, unless net driver perform copybreak.
2054 * Note: for send buffers, TCP works better if we can build two skbs at
2057 #define TCP_SKB_MIN_TRUESIZE (2048 + SKB_DATA_ALIGN(sizeof(struct sk_buff)))
2059 #define SOCK_MIN_SNDBUF (TCP_SKB_MIN_TRUESIZE * 2)
2060 #define SOCK_MIN_RCVBUF TCP_SKB_MIN_TRUESIZE
2062 static inline void sk_stream_moderate_sndbuf(struct sock
*sk
)
2064 if (!(sk
->sk_userlocks
& SOCK_SNDBUF_LOCK
)) {
2065 sk
->sk_sndbuf
= min(sk
->sk_sndbuf
, sk
->sk_wmem_queued
>> 1);
2066 sk
->sk_sndbuf
= max_t(u32
, sk
->sk_sndbuf
, SOCK_MIN_SNDBUF
);
2070 struct sk_buff
*sk_stream_alloc_skb(struct sock
*sk
, int size
, gfp_t gfp
);
2073 * sk_page_frag - return an appropriate page_frag
2076 * If socket allocation mode allows current thread to sleep, it means its
2077 * safe to use the per task page_frag instead of the per socket one.
2079 static inline struct page_frag
*sk_page_frag(struct sock
*sk
)
2081 if (sk
->sk_allocation
& __GFP_WAIT
)
2082 return ¤t
->task_frag
;
2084 return &sk
->sk_frag
;
2087 bool sk_page_frag_refill(struct sock
*sk
, struct page_frag
*pfrag
);
2090 * Default write policy as shown to user space via poll/select/SIGIO
2092 static inline bool sock_writeable(const struct sock
*sk
)
2094 return atomic_read(&sk
->sk_wmem_alloc
) < (sk
->sk_sndbuf
>> 1);
2097 static inline gfp_t
gfp_any(void)
2099 return in_softirq() ? GFP_ATOMIC
: GFP_KERNEL
;
2102 static inline long sock_rcvtimeo(const struct sock
*sk
, bool noblock
)
2104 return noblock
? 0 : sk
->sk_rcvtimeo
;
2107 static inline long sock_sndtimeo(const struct sock
*sk
, bool noblock
)
2109 return noblock
? 0 : sk
->sk_sndtimeo
;
2112 static inline int sock_rcvlowat(const struct sock
*sk
, int waitall
, int len
)
2114 return (waitall
? len
: min_t(int, sk
->sk_rcvlowat
, len
)) ? : 1;
2117 /* Alas, with timeout socket operations are not restartable.
2118 * Compare this to poll().
2120 static inline int sock_intr_errno(long timeo
)
2122 return timeo
== MAX_SCHEDULE_TIMEOUT
? -ERESTARTSYS
: -EINTR
;
2125 void __sock_recv_timestamp(struct msghdr
*msg
, struct sock
*sk
,
2126 struct sk_buff
*skb
);
2127 void __sock_recv_wifi_status(struct msghdr
*msg
, struct sock
*sk
,
2128 struct sk_buff
*skb
);
2131 sock_recv_timestamp(struct msghdr
*msg
, struct sock
*sk
, struct sk_buff
*skb
)
2133 ktime_t kt
= skb
->tstamp
;
2134 struct skb_shared_hwtstamps
*hwtstamps
= skb_hwtstamps(skb
);
2137 * generate control messages if
2138 * - receive time stamping in software requested (SOCK_RCVTSTAMP
2139 * or SOCK_TIMESTAMPING_RX_SOFTWARE)
2140 * - software time stamp available and wanted
2141 * (SOCK_TIMESTAMPING_SOFTWARE)
2142 * - hardware time stamps available and wanted
2143 * (SOCK_TIMESTAMPING_SYS_HARDWARE or
2144 * SOCK_TIMESTAMPING_RAW_HARDWARE)
2146 if (sock_flag(sk
, SOCK_RCVTSTAMP
) ||
2147 sock_flag(sk
, SOCK_TIMESTAMPING_RX_SOFTWARE
) ||
2148 (kt
.tv64
&& sock_flag(sk
, SOCK_TIMESTAMPING_SOFTWARE
)) ||
2149 (hwtstamps
->hwtstamp
.tv64
&&
2150 sock_flag(sk
, SOCK_TIMESTAMPING_RAW_HARDWARE
)) ||
2151 (hwtstamps
->syststamp
.tv64
&&
2152 sock_flag(sk
, SOCK_TIMESTAMPING_SYS_HARDWARE
)))
2153 __sock_recv_timestamp(msg
, sk
, skb
);
2157 if (sock_flag(sk
, SOCK_WIFI_STATUS
) && skb
->wifi_acked_valid
)
2158 __sock_recv_wifi_status(msg
, sk
, skb
);
2161 void __sock_recv_ts_and_drops(struct msghdr
*msg
, struct sock
*sk
,
2162 struct sk_buff
*skb
);
2164 static inline void sock_recv_ts_and_drops(struct msghdr
*msg
, struct sock
*sk
,
2165 struct sk_buff
*skb
)
2167 #define FLAGS_TS_OR_DROPS ((1UL << SOCK_RXQ_OVFL) | \
2168 (1UL << SOCK_RCVTSTAMP) | \
2169 (1UL << SOCK_TIMESTAMPING_SOFTWARE) | \
2170 (1UL << SOCK_TIMESTAMPING_RAW_HARDWARE) | \
2171 (1UL << SOCK_TIMESTAMPING_SYS_HARDWARE))
2173 if (sk
->sk_flags
& FLAGS_TS_OR_DROPS
)
2174 __sock_recv_ts_and_drops(msg
, sk
, skb
);
2176 sk
->sk_stamp
= skb
->tstamp
;
2180 * sock_tx_timestamp - checks whether the outgoing packet is to be time stamped
2181 * @sk: socket sending this packet
2182 * @tx_flags: filled with instructions for time stamping
2184 * Currently only depends on SOCK_TIMESTAMPING* flags.
2186 void sock_tx_timestamp(struct sock
*sk
, __u8
*tx_flags
);
2189 * sk_eat_skb - Release a skb if it is no longer needed
2190 * @sk: socket to eat this skb from
2191 * @skb: socket buffer to eat
2192 * @copied_early: flag indicating whether DMA operations copied this data early
2194 * This routine must be called with interrupts disabled or with the socket
2195 * locked so that the sk_buff queue operation is ok.
2197 #ifdef CONFIG_NET_DMA
2198 static inline void sk_eat_skb(struct sock
*sk
, struct sk_buff
*skb
, bool copied_early
)
2200 __skb_unlink(skb
, &sk
->sk_receive_queue
);
2204 __skb_queue_tail(&sk
->sk_async_wait_queue
, skb
);
2207 static inline void sk_eat_skb(struct sock
*sk
, struct sk_buff
*skb
, bool copied_early
)
2209 __skb_unlink(skb
, &sk
->sk_receive_queue
);
2215 struct net
*sock_net(const struct sock
*sk
)
2217 return read_pnet(&sk
->sk_net
);
2221 void sock_net_set(struct sock
*sk
, struct net
*net
)
2223 write_pnet(&sk
->sk_net
, net
);
2227 * Kernel sockets, f.e. rtnl or icmp_socket, are a part of a namespace.
2228 * They should not hold a reference to a namespace in order to allow
2230 * Sockets after sk_change_net should be released using sk_release_kernel
2232 static inline void sk_change_net(struct sock
*sk
, struct net
*net
)
2234 struct net
*current_net
= sock_net(sk
);
2236 if (!net_eq(current_net
, net
)) {
2237 put_net(current_net
);
2238 sock_net_set(sk
, hold_net(net
));
2242 static inline struct sock
*skb_steal_sock(struct sk_buff
*skb
)
2245 struct sock
*sk
= skb
->sk
;
2247 skb
->destructor
= NULL
;
2254 void sock_enable_timestamp(struct sock
*sk
, int flag
);
2255 int sock_get_timestamp(struct sock
*, struct timeval __user
*);
2256 int sock_get_timestampns(struct sock
*, struct timespec __user
*);
2257 int sock_recv_errqueue(struct sock
*sk
, struct msghdr
*msg
, int len
, int level
,
2260 bool sk_ns_capable(const struct sock
*sk
,
2261 struct user_namespace
*user_ns
, int cap
);
2262 bool sk_capable(const struct sock
*sk
, int cap
);
2263 bool sk_net_capable(const struct sock
*sk
, int cap
);
2266 * Enable debug/info messages
2268 extern int net_msg_warn
;
2269 #define NETDEBUG(fmt, args...) \
2270 do { if (net_msg_warn) printk(fmt,##args); } while (0)
2272 #define LIMIT_NETDEBUG(fmt, args...) \
2273 do { if (net_msg_warn && net_ratelimit()) printk(fmt,##args); } while(0)
2275 extern __u32 sysctl_wmem_max
;
2276 extern __u32 sysctl_rmem_max
;
2278 extern int sysctl_optmem_max
;
2280 extern __u32 sysctl_wmem_default
;
2281 extern __u32 sysctl_rmem_default
;
2283 #endif /* _SOCK_H */