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/page_counter.h>
58 #include <linux/memcontrol.h>
59 #include <linux/static_key.h>
60 #include <linux/sched.h>
61 #include <linux/wait.h>
62 #include <linux/cgroup-defs.h>
63 #include <linux/rbtree.h>
64 #include <linux/filter.h>
65 #include <linux/rculist_nulls.h>
66 #include <linux/poll.h>
68 #include <linux/atomic.h>
69 #include <linux/refcount.h>
71 #include <net/checksum.h>
72 #include <net/tcp_states.h>
73 #include <linux/net_tstamp.h>
75 #include <net/l3mdev.h>
78 * This structure really needs to be cleaned up.
79 * Most of it is for TCP, and not used by any of
80 * the other protocols.
83 /* Define this to get the SOCK_DBG debugging facility. */
84 #define SOCK_DEBUGGING
86 #define SOCK_DEBUG(sk, msg...) do { if ((sk) && sock_flag((sk), SOCK_DBG)) \
87 printk(KERN_DEBUG msg); } while (0)
89 /* Validate arguments and do nothing */
90 static inline __printf(2, 3)
91 void SOCK_DEBUG(const struct sock
*sk
, const char *msg
, ...)
96 /* This is the per-socket lock. The spinlock provides a synchronization
97 * between user contexts and software interrupt processing, whereas the
98 * mini-semaphore synchronizes multiple users amongst themselves.
103 wait_queue_head_t wq
;
105 * We express the mutex-alike socket_lock semantics
106 * to the lock validator by explicitly managing
107 * the slock as a lock variant (in addition to
110 #ifdef CONFIG_DEBUG_LOCK_ALLOC
111 struct lockdep_map dep_map
;
119 typedef __u32 __bitwise __portpair
;
120 typedef __u64 __bitwise __addrpair
;
123 * struct sock_common - minimal network layer representation of sockets
124 * @skc_daddr: Foreign IPv4 addr
125 * @skc_rcv_saddr: Bound local IPv4 addr
126 * @skc_hash: hash value used with various protocol lookup tables
127 * @skc_u16hashes: two u16 hash values used by UDP lookup tables
128 * @skc_dport: placeholder for inet_dport/tw_dport
129 * @skc_num: placeholder for inet_num/tw_num
130 * @skc_family: network address family
131 * @skc_state: Connection state
132 * @skc_reuse: %SO_REUSEADDR setting
133 * @skc_reuseport: %SO_REUSEPORT setting
134 * @skc_bound_dev_if: bound device index if != 0
135 * @skc_bind_node: bind hash linkage for various protocol lookup tables
136 * @skc_portaddr_node: second hash linkage for UDP/UDP-Lite protocol
137 * @skc_prot: protocol handlers inside a network family
138 * @skc_net: reference to the network namespace of this socket
139 * @skc_node: main hash linkage for various protocol lookup tables
140 * @skc_nulls_node: main hash linkage for TCP/UDP/UDP-Lite protocol
141 * @skc_tx_queue_mapping: tx queue number for this connection
142 * @skc_rx_queue_mapping: rx queue number for this connection
143 * @skc_flags: place holder for sk_flags
144 * %SO_LINGER (l_onoff), %SO_BROADCAST, %SO_KEEPALIVE,
145 * %SO_OOBINLINE settings, %SO_TIMESTAMPING settings
146 * @skc_incoming_cpu: record/match cpu processing incoming packets
147 * @skc_refcnt: reference count
149 * This is the minimal network layer representation of sockets, the header
150 * for struct sock and struct inet_timewait_sock.
153 /* skc_daddr and skc_rcv_saddr must be grouped on a 8 bytes aligned
154 * address on 64bit arches : cf INET_MATCH()
157 __addrpair skc_addrpair
;
160 __be32 skc_rcv_saddr
;
164 unsigned int skc_hash
;
165 __u16 skc_u16hashes
[2];
167 /* skc_dport && skc_num must be grouped as well */
169 __portpair skc_portpair
;
176 unsigned short skc_family
;
177 volatile unsigned char skc_state
;
178 unsigned char skc_reuse
:4;
179 unsigned char skc_reuseport
:1;
180 unsigned char skc_ipv6only
:1;
181 unsigned char skc_net_refcnt
:1;
182 int skc_bound_dev_if
;
184 struct hlist_node skc_bind_node
;
185 struct hlist_node skc_portaddr_node
;
187 struct proto
*skc_prot
;
188 possible_net_t skc_net
;
190 #if IS_ENABLED(CONFIG_IPV6)
191 struct in6_addr skc_v6_daddr
;
192 struct in6_addr skc_v6_rcv_saddr
;
195 atomic64_t skc_cookie
;
197 /* following fields are padding to force
198 * offset(struct sock, sk_refcnt) == 128 on 64bit arches
199 * assuming IPV6 is enabled. We use this padding differently
200 * for different kind of 'sockets'
203 unsigned long skc_flags
;
204 struct sock
*skc_listener
; /* request_sock */
205 struct inet_timewait_death_row
*skc_tw_dr
; /* inet_timewait_sock */
208 * fields between dontcopy_begin/dontcopy_end
209 * are not copied in sock_copy()
212 int skc_dontcopy_begin
[0];
215 struct hlist_node skc_node
;
216 struct hlist_nulls_node skc_nulls_node
;
218 unsigned short skc_tx_queue_mapping
;
220 unsigned short skc_rx_queue_mapping
;
223 int skc_incoming_cpu
;
225 u32 skc_tw_rcv_nxt
; /* struct tcp_timewait_sock */
228 refcount_t skc_refcnt
;
230 int skc_dontcopy_end
[0];
233 u32 skc_window_clamp
;
234 u32 skc_tw_snd_nxt
; /* struct tcp_timewait_sock */
240 * struct sock - network layer representation of sockets
241 * @__sk_common: shared layout with inet_timewait_sock
242 * @sk_shutdown: mask of %SEND_SHUTDOWN and/or %RCV_SHUTDOWN
243 * @sk_userlocks: %SO_SNDBUF and %SO_RCVBUF settings
244 * @sk_lock: synchronizer
245 * @sk_kern_sock: True if sock is using kernel lock classes
246 * @sk_rcvbuf: size of receive buffer in bytes
247 * @sk_wq: sock wait queue and async head
248 * @sk_rx_dst: receive input route used by early demux
249 * @sk_dst_cache: destination cache
250 * @sk_dst_pending_confirm: need to confirm neighbour
251 * @sk_policy: flow policy
252 * @sk_receive_queue: incoming packets
253 * @sk_wmem_alloc: transmit queue bytes committed
254 * @sk_tsq_flags: TCP Small Queues flags
255 * @sk_write_queue: Packet sending queue
256 * @sk_omem_alloc: "o" is "option" or "other"
257 * @sk_wmem_queued: persistent queue size
258 * @sk_forward_alloc: space allocated forward
259 * @sk_napi_id: id of the last napi context to receive data for sk
260 * @sk_ll_usec: usecs to busypoll when there is no data
261 * @sk_allocation: allocation mode
262 * @sk_pacing_rate: Pacing rate (if supported by transport/packet scheduler)
263 * @sk_pacing_status: Pacing status (requested, handled by sch_fq)
264 * @sk_max_pacing_rate: Maximum pacing rate (%SO_MAX_PACING_RATE)
265 * @sk_sndbuf: size of send buffer in bytes
266 * @__sk_flags_offset: empty field used to determine location of bitfield
267 * @sk_padding: unused element for alignment
268 * @sk_no_check_tx: %SO_NO_CHECK setting, set checksum in TX packets
269 * @sk_no_check_rx: allow zero checksum in RX packets
270 * @sk_route_caps: route capabilities (e.g. %NETIF_F_TSO)
271 * @sk_route_nocaps: forbidden route capabilities (e.g NETIF_F_GSO_MASK)
272 * @sk_gso_type: GSO type (e.g. %SKB_GSO_TCPV4)
273 * @sk_gso_max_size: Maximum GSO segment size to build
274 * @sk_gso_max_segs: Maximum number of GSO segments
275 * @sk_pacing_shift: scaling factor for TCP Small Queues
276 * @sk_lingertime: %SO_LINGER l_linger setting
277 * @sk_backlog: always used with the per-socket spinlock held
278 * @sk_callback_lock: used with the callbacks in the end of this struct
279 * @sk_error_queue: rarely used
280 * @sk_prot_creator: sk_prot of original sock creator (see ipv6_setsockopt,
281 * IPV6_ADDRFORM for instance)
282 * @sk_err: last error
283 * @sk_err_soft: errors that don't cause failure but are the cause of a
284 * persistent failure not just 'timed out'
285 * @sk_drops: raw/udp drops counter
286 * @sk_ack_backlog: current listen backlog
287 * @sk_max_ack_backlog: listen backlog set in listen()
288 * @sk_uid: user id of owner
289 * @sk_priority: %SO_PRIORITY setting
290 * @sk_type: socket type (%SOCK_STREAM, etc)
291 * @sk_protocol: which protocol this socket belongs in this network family
292 * @sk_peer_pid: &struct pid for this socket's peer
293 * @sk_peer_cred: %SO_PEERCRED setting
294 * @sk_rcvlowat: %SO_RCVLOWAT setting
295 * @sk_rcvtimeo: %SO_RCVTIMEO setting
296 * @sk_sndtimeo: %SO_SNDTIMEO setting
297 * @sk_txhash: computed flow hash for use on transmit
298 * @sk_filter: socket filtering instructions
299 * @sk_timer: sock cleanup timer
300 * @sk_stamp: time stamp of last packet received
301 * @sk_stamp_seq: lock for accessing sk_stamp on 32 bit architectures only
302 * @sk_tsflags: SO_TIMESTAMPING socket options
303 * @sk_tskey: counter to disambiguate concurrent tstamp requests
304 * @sk_zckey: counter to order MSG_ZEROCOPY notifications
305 * @sk_socket: Identd and reporting IO signals
306 * @sk_user_data: RPC layer private data
307 * @sk_frag: cached page frag
308 * @sk_peek_off: current peek_offset value
309 * @sk_send_head: front of stuff to transmit
310 * @sk_security: used by security modules
311 * @sk_mark: generic packet mark
312 * @sk_cgrp_data: cgroup data for this cgroup
313 * @sk_memcg: this socket's memory cgroup association
314 * @sk_write_pending: a write to stream socket waits to start
315 * @sk_state_change: callback to indicate change in the state of the sock
316 * @sk_data_ready: callback to indicate there is data to be processed
317 * @sk_write_space: callback to indicate there is bf sending space available
318 * @sk_error_report: callback to indicate errors (e.g. %MSG_ERRQUEUE)
319 * @sk_backlog_rcv: callback to process the backlog
320 * @sk_destruct: called at sock freeing time, i.e. when all refcnt == 0
321 * @sk_reuseport_cb: reuseport group container
322 * @sk_rcu: used during RCU grace period
323 * @sk_clockid: clockid used by time-based scheduling (SO_TXTIME)
324 * @sk_txtime_deadline_mode: set deadline mode for SO_TXTIME
325 * @sk_txtime_unused: unused txtime flags
329 * Now struct inet_timewait_sock also uses sock_common, so please just
330 * don't add nothing before this first member (__sk_common) --acme
332 struct sock_common __sk_common
;
333 #define sk_node __sk_common.skc_node
334 #define sk_nulls_node __sk_common.skc_nulls_node
335 #define sk_refcnt __sk_common.skc_refcnt
336 #define sk_tx_queue_mapping __sk_common.skc_tx_queue_mapping
338 #define sk_rx_queue_mapping __sk_common.skc_rx_queue_mapping
341 #define sk_dontcopy_begin __sk_common.skc_dontcopy_begin
342 #define sk_dontcopy_end __sk_common.skc_dontcopy_end
343 #define sk_hash __sk_common.skc_hash
344 #define sk_portpair __sk_common.skc_portpair
345 #define sk_num __sk_common.skc_num
346 #define sk_dport __sk_common.skc_dport
347 #define sk_addrpair __sk_common.skc_addrpair
348 #define sk_daddr __sk_common.skc_daddr
349 #define sk_rcv_saddr __sk_common.skc_rcv_saddr
350 #define sk_family __sk_common.skc_family
351 #define sk_state __sk_common.skc_state
352 #define sk_reuse __sk_common.skc_reuse
353 #define sk_reuseport __sk_common.skc_reuseport
354 #define sk_ipv6only __sk_common.skc_ipv6only
355 #define sk_net_refcnt __sk_common.skc_net_refcnt
356 #define sk_bound_dev_if __sk_common.skc_bound_dev_if
357 #define sk_bind_node __sk_common.skc_bind_node
358 #define sk_prot __sk_common.skc_prot
359 #define sk_net __sk_common.skc_net
360 #define sk_v6_daddr __sk_common.skc_v6_daddr
361 #define sk_v6_rcv_saddr __sk_common.skc_v6_rcv_saddr
362 #define sk_cookie __sk_common.skc_cookie
363 #define sk_incoming_cpu __sk_common.skc_incoming_cpu
364 #define sk_flags __sk_common.skc_flags
365 #define sk_rxhash __sk_common.skc_rxhash
367 socket_lock_t sk_lock
;
370 struct sk_buff_head sk_error_queue
;
371 struct sk_buff_head sk_receive_queue
;
373 * The backlog queue is special, it is always used with
374 * the per-socket spinlock held and requires low latency
375 * access. Therefore we special case it's implementation.
376 * Note : rmem_alloc is in this structure to fill a hole
377 * on 64bit arches, not because its logically part of
383 struct sk_buff
*head
;
384 struct sk_buff
*tail
;
386 #define sk_rmem_alloc sk_backlog.rmem_alloc
388 int sk_forward_alloc
;
389 #ifdef CONFIG_NET_RX_BUSY_POLL
390 unsigned int sk_ll_usec
;
391 /* ===== mostly read cache line ===== */
392 unsigned int sk_napi_id
;
396 struct sk_filter __rcu
*sk_filter
;
398 struct socket_wq __rcu
*sk_wq
;
399 struct socket_wq
*sk_wq_raw
;
402 struct xfrm_policy __rcu
*sk_policy
[2];
404 struct dst_entry
*sk_rx_dst
;
405 struct dst_entry __rcu
*sk_dst_cache
;
406 atomic_t sk_omem_alloc
;
409 /* ===== cache line for TX ===== */
411 refcount_t sk_wmem_alloc
;
412 unsigned long sk_tsq_flags
;
414 struct sk_buff
*sk_send_head
;
415 struct rb_root tcp_rtx_queue
;
417 struct sk_buff_head sk_write_queue
;
419 int sk_write_pending
;
420 __u32 sk_dst_pending_confirm
;
421 u32 sk_pacing_status
; /* see enum sk_pacing */
423 struct timer_list sk_timer
;
426 unsigned long sk_pacing_rate
; /* bytes per second */
427 unsigned long sk_max_pacing_rate
;
428 struct page_frag sk_frag
;
429 netdev_features_t sk_route_caps
;
430 netdev_features_t sk_route_nocaps
;
431 netdev_features_t sk_route_forced_caps
;
433 unsigned int sk_gso_max_size
;
438 * Because of non atomicity rules, all
439 * changes are protected by socket lock.
441 unsigned int __sk_flags_offset
[0];
442 #ifdef __BIG_ENDIAN_BITFIELD
443 #define SK_FL_PROTO_SHIFT 16
444 #define SK_FL_PROTO_MASK 0x00ff0000
446 #define SK_FL_TYPE_SHIFT 0
447 #define SK_FL_TYPE_MASK 0x0000ffff
449 #define SK_FL_PROTO_SHIFT 8
450 #define SK_FL_PROTO_MASK 0x0000ff00
452 #define SK_FL_TYPE_SHIFT 16
453 #define SK_FL_TYPE_MASK 0xffff0000
456 unsigned int sk_padding
: 1,
463 #define SK_PROTOCOL_MAX U8_MAX
466 unsigned long sk_lingertime
;
467 struct proto
*sk_prot_creator
;
468 rwlock_t sk_callback_lock
;
472 u32 sk_max_ack_backlog
;
474 struct pid
*sk_peer_pid
;
475 const struct cred
*sk_peer_cred
;
478 #if BITS_PER_LONG==32
479 seqlock_t sk_stamp_seq
;
487 u8 sk_txtime_deadline_mode
: 1,
488 sk_txtime_report_errors
: 1,
489 sk_txtime_unused
: 6;
491 struct socket
*sk_socket
;
493 #ifdef CONFIG_SECURITY
496 struct sock_cgroup_data sk_cgrp_data
;
497 struct mem_cgroup
*sk_memcg
;
498 void (*sk_state_change
)(struct sock
*sk
);
499 void (*sk_data_ready
)(struct sock
*sk
);
500 void (*sk_write_space
)(struct sock
*sk
);
501 void (*sk_error_report
)(struct sock
*sk
);
502 int (*sk_backlog_rcv
)(struct sock
*sk
,
503 struct sk_buff
*skb
);
504 #ifdef CONFIG_SOCK_VALIDATE_XMIT
505 struct sk_buff
* (*sk_validate_xmit_skb
)(struct sock
*sk
,
506 struct net_device
*dev
,
507 struct sk_buff
*skb
);
509 void (*sk_destruct
)(struct sock
*sk
);
510 struct sock_reuseport __rcu
*sk_reuseport_cb
;
511 struct rcu_head sk_rcu
;
516 SK_PACING_NEEDED
= 1,
520 #define __sk_user_data(sk) ((*((void __rcu **)&(sk)->sk_user_data)))
522 #define rcu_dereference_sk_user_data(sk) rcu_dereference(__sk_user_data((sk)))
523 #define rcu_assign_sk_user_data(sk, ptr) rcu_assign_pointer(__sk_user_data((sk)), ptr)
526 * SK_CAN_REUSE and SK_NO_REUSE on a socket mean that the socket is OK
527 * or not whether his port will be reused by someone else. SK_FORCE_REUSE
528 * on a socket means that the socket will reuse everybody else's port
529 * without looking at the other's sk_reuse value.
532 #define SK_NO_REUSE 0
533 #define SK_CAN_REUSE 1
534 #define SK_FORCE_REUSE 2
536 int sk_set_peek_off(struct sock
*sk
, int val
);
538 static inline int sk_peek_offset(struct sock
*sk
, int flags
)
540 if (unlikely(flags
& MSG_PEEK
)) {
541 return READ_ONCE(sk
->sk_peek_off
);
547 static inline void sk_peek_offset_bwd(struct sock
*sk
, int val
)
549 s32 off
= READ_ONCE(sk
->sk_peek_off
);
551 if (unlikely(off
>= 0)) {
552 off
= max_t(s32
, off
- val
, 0);
553 WRITE_ONCE(sk
->sk_peek_off
, off
);
557 static inline void sk_peek_offset_fwd(struct sock
*sk
, int val
)
559 sk_peek_offset_bwd(sk
, -val
);
563 * Hashed lists helper routines
565 static inline struct sock
*sk_entry(const struct hlist_node
*node
)
567 return hlist_entry(node
, struct sock
, sk_node
);
570 static inline struct sock
*__sk_head(const struct hlist_head
*head
)
572 return hlist_entry(head
->first
, struct sock
, sk_node
);
575 static inline struct sock
*sk_head(const struct hlist_head
*head
)
577 return hlist_empty(head
) ? NULL
: __sk_head(head
);
580 static inline struct sock
*__sk_nulls_head(const struct hlist_nulls_head
*head
)
582 return hlist_nulls_entry(head
->first
, struct sock
, sk_nulls_node
);
585 static inline struct sock
*sk_nulls_head(const struct hlist_nulls_head
*head
)
587 return hlist_nulls_empty(head
) ? NULL
: __sk_nulls_head(head
);
590 static inline struct sock
*sk_next(const struct sock
*sk
)
592 return hlist_entry_safe(sk
->sk_node
.next
, struct sock
, sk_node
);
595 static inline struct sock
*sk_nulls_next(const struct sock
*sk
)
597 return (!is_a_nulls(sk
->sk_nulls_node
.next
)) ?
598 hlist_nulls_entry(sk
->sk_nulls_node
.next
,
599 struct sock
, sk_nulls_node
) :
603 static inline bool sk_unhashed(const struct sock
*sk
)
605 return hlist_unhashed(&sk
->sk_node
);
608 static inline bool sk_hashed(const struct sock
*sk
)
610 return !sk_unhashed(sk
);
613 static inline void sk_node_init(struct hlist_node
*node
)
618 static inline void sk_nulls_node_init(struct hlist_nulls_node
*node
)
623 static inline void __sk_del_node(struct sock
*sk
)
625 __hlist_del(&sk
->sk_node
);
628 /* NB: equivalent to hlist_del_init_rcu */
629 static inline bool __sk_del_node_init(struct sock
*sk
)
633 sk_node_init(&sk
->sk_node
);
639 /* Grab socket reference count. This operation is valid only
640 when sk is ALREADY grabbed f.e. it is found in hash table
641 or a list and the lookup is made under lock preventing hash table
645 static __always_inline
void sock_hold(struct sock
*sk
)
647 refcount_inc(&sk
->sk_refcnt
);
650 /* Ungrab socket in the context, which assumes that socket refcnt
651 cannot hit zero, f.e. it is true in context of any socketcall.
653 static __always_inline
void __sock_put(struct sock
*sk
)
655 refcount_dec(&sk
->sk_refcnt
);
658 static inline bool sk_del_node_init(struct sock
*sk
)
660 bool rc
= __sk_del_node_init(sk
);
663 /* paranoid for a while -acme */
664 WARN_ON(refcount_read(&sk
->sk_refcnt
) == 1);
669 #define sk_del_node_init_rcu(sk) sk_del_node_init(sk)
671 static inline bool __sk_nulls_del_node_init_rcu(struct sock
*sk
)
674 hlist_nulls_del_init_rcu(&sk
->sk_nulls_node
);
680 static inline bool sk_nulls_del_node_init_rcu(struct sock
*sk
)
682 bool rc
= __sk_nulls_del_node_init_rcu(sk
);
685 /* paranoid for a while -acme */
686 WARN_ON(refcount_read(&sk
->sk_refcnt
) == 1);
692 static inline void __sk_add_node(struct sock
*sk
, struct hlist_head
*list
)
694 hlist_add_head(&sk
->sk_node
, list
);
697 static inline void sk_add_node(struct sock
*sk
, struct hlist_head
*list
)
700 __sk_add_node(sk
, list
);
703 static inline void sk_add_node_rcu(struct sock
*sk
, struct hlist_head
*list
)
706 if (IS_ENABLED(CONFIG_IPV6
) && sk
->sk_reuseport
&&
707 sk
->sk_family
== AF_INET6
)
708 hlist_add_tail_rcu(&sk
->sk_node
, list
);
710 hlist_add_head_rcu(&sk
->sk_node
, list
);
713 static inline void sk_add_node_tail_rcu(struct sock
*sk
, struct hlist_head
*list
)
716 hlist_add_tail_rcu(&sk
->sk_node
, list
);
719 static inline void __sk_nulls_add_node_rcu(struct sock
*sk
, struct hlist_nulls_head
*list
)
721 hlist_nulls_add_head_rcu(&sk
->sk_nulls_node
, list
);
724 static inline void sk_nulls_add_node_rcu(struct sock
*sk
, struct hlist_nulls_head
*list
)
727 __sk_nulls_add_node_rcu(sk
, list
);
730 static inline void __sk_del_bind_node(struct sock
*sk
)
732 __hlist_del(&sk
->sk_bind_node
);
735 static inline void sk_add_bind_node(struct sock
*sk
,
736 struct hlist_head
*list
)
738 hlist_add_head(&sk
->sk_bind_node
, list
);
741 #define sk_for_each(__sk, list) \
742 hlist_for_each_entry(__sk, list, sk_node)
743 #define sk_for_each_rcu(__sk, list) \
744 hlist_for_each_entry_rcu(__sk, list, sk_node)
745 #define sk_nulls_for_each(__sk, node, list) \
746 hlist_nulls_for_each_entry(__sk, node, list, sk_nulls_node)
747 #define sk_nulls_for_each_rcu(__sk, node, list) \
748 hlist_nulls_for_each_entry_rcu(__sk, node, list, sk_nulls_node)
749 #define sk_for_each_from(__sk) \
750 hlist_for_each_entry_from(__sk, sk_node)
751 #define sk_nulls_for_each_from(__sk, node) \
752 if (__sk && ({ node = &(__sk)->sk_nulls_node; 1; })) \
753 hlist_nulls_for_each_entry_from(__sk, node, sk_nulls_node)
754 #define sk_for_each_safe(__sk, tmp, list) \
755 hlist_for_each_entry_safe(__sk, tmp, list, sk_node)
756 #define sk_for_each_bound(__sk, list) \
757 hlist_for_each_entry(__sk, list, sk_bind_node)
760 * sk_for_each_entry_offset_rcu - iterate over a list at a given struct offset
761 * @tpos: the type * to use as a loop cursor.
762 * @pos: the &struct hlist_node to use as a loop cursor.
763 * @head: the head for your list.
764 * @offset: offset of hlist_node within the struct.
767 #define sk_for_each_entry_offset_rcu(tpos, pos, head, offset) \
768 for (pos = rcu_dereference(hlist_first_rcu(head)); \
770 ({ tpos = (typeof(*tpos) *)((void *)pos - offset); 1;}); \
771 pos = rcu_dereference(hlist_next_rcu(pos)))
773 static inline struct user_namespace
*sk_user_ns(struct sock
*sk
)
775 /* Careful only use this in a context where these parameters
776 * can not change and must all be valid, such as recvmsg from
779 return sk
->sk_socket
->file
->f_cred
->user_ns
;
793 SOCK_USE_WRITE_QUEUE
, /* whether to call sk->sk_write_space in sock_wfree */
794 SOCK_DBG
, /* %SO_DEBUG setting */
795 SOCK_RCVTSTAMP
, /* %SO_TIMESTAMP setting */
796 SOCK_RCVTSTAMPNS
, /* %SO_TIMESTAMPNS setting */
797 SOCK_LOCALROUTE
, /* route locally only, %SO_DONTROUTE setting */
798 SOCK_QUEUE_SHRUNK
, /* write queue has been shrunk recently */
799 SOCK_MEMALLOC
, /* VM depends on this socket for swapping */
800 SOCK_TIMESTAMPING_RX_SOFTWARE
, /* %SOF_TIMESTAMPING_RX_SOFTWARE */
801 SOCK_FASYNC
, /* fasync() active */
803 SOCK_ZEROCOPY
, /* buffers from userspace */
804 SOCK_WIFI_STATUS
, /* push wifi status to userspace */
805 SOCK_NOFCS
, /* Tell NIC not to do the Ethernet FCS.
806 * Will use last 4 bytes of packet sent from
807 * user-space instead.
809 SOCK_FILTER_LOCKED
, /* Filter cannot be changed anymore */
810 SOCK_SELECT_ERR_QUEUE
, /* Wake select on error queue */
811 SOCK_RCU_FREE
, /* wait rcu grace period in sk_destruct() */
813 SOCK_XDP
, /* XDP is attached */
814 SOCK_TSTAMP_NEW
, /* Indicates 64 bit timestamps always */
817 #define SK_FLAGS_TIMESTAMP ((1UL << SOCK_TIMESTAMP) | (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE))
819 static inline void sock_copy_flags(struct sock
*nsk
, struct sock
*osk
)
821 nsk
->sk_flags
= osk
->sk_flags
;
824 static inline void sock_set_flag(struct sock
*sk
, enum sock_flags flag
)
826 __set_bit(flag
, &sk
->sk_flags
);
829 static inline void sock_reset_flag(struct sock
*sk
, enum sock_flags flag
)
831 __clear_bit(flag
, &sk
->sk_flags
);
834 static inline bool sock_flag(const struct sock
*sk
, enum sock_flags flag
)
836 return test_bit(flag
, &sk
->sk_flags
);
840 DECLARE_STATIC_KEY_FALSE(memalloc_socks_key
);
841 static inline int sk_memalloc_socks(void)
843 return static_branch_unlikely(&memalloc_socks_key
);
847 static inline int sk_memalloc_socks(void)
854 static inline gfp_t
sk_gfp_mask(const struct sock
*sk
, gfp_t gfp_mask
)
856 return gfp_mask
| (sk
->sk_allocation
& __GFP_MEMALLOC
);
859 static inline void sk_acceptq_removed(struct sock
*sk
)
861 sk
->sk_ack_backlog
--;
864 static inline void sk_acceptq_added(struct sock
*sk
)
866 sk
->sk_ack_backlog
++;
869 static inline bool sk_acceptq_is_full(const struct sock
*sk
)
871 return sk
->sk_ack_backlog
> sk
->sk_max_ack_backlog
;
875 * Compute minimal free write space needed to queue new packets.
877 static inline int sk_stream_min_wspace(const struct sock
*sk
)
879 return sk
->sk_wmem_queued
>> 1;
882 static inline int sk_stream_wspace(const struct sock
*sk
)
884 return sk
->sk_sndbuf
- sk
->sk_wmem_queued
;
887 void sk_stream_write_space(struct sock
*sk
);
889 /* OOB backlog add */
890 static inline void __sk_add_backlog(struct sock
*sk
, struct sk_buff
*skb
)
892 /* dont let skb dst not refcounted, we are going to leave rcu lock */
895 if (!sk
->sk_backlog
.tail
)
896 sk
->sk_backlog
.head
= skb
;
898 sk
->sk_backlog
.tail
->next
= skb
;
900 sk
->sk_backlog
.tail
= skb
;
905 * Take into account size of receive queue and backlog queue
906 * Do not take into account this skb truesize,
907 * to allow even a single big packet to come.
909 static inline bool sk_rcvqueues_full(const struct sock
*sk
, unsigned int limit
)
911 unsigned int qsize
= sk
->sk_backlog
.len
+ atomic_read(&sk
->sk_rmem_alloc
);
913 return qsize
> limit
;
916 /* The per-socket spinlock must be held here. */
917 static inline __must_check
int sk_add_backlog(struct sock
*sk
, struct sk_buff
*skb
,
920 if (sk_rcvqueues_full(sk
, limit
))
924 * If the skb was allocated from pfmemalloc reserves, only
925 * allow SOCK_MEMALLOC sockets to use it as this socket is
926 * helping free memory
928 if (skb_pfmemalloc(skb
) && !sock_flag(sk
, SOCK_MEMALLOC
))
931 __sk_add_backlog(sk
, skb
);
932 sk
->sk_backlog
.len
+= skb
->truesize
;
936 int __sk_backlog_rcv(struct sock
*sk
, struct sk_buff
*skb
);
938 static inline int sk_backlog_rcv(struct sock
*sk
, struct sk_buff
*skb
)
940 if (sk_memalloc_socks() && skb_pfmemalloc(skb
))
941 return __sk_backlog_rcv(sk
, skb
);
943 return sk
->sk_backlog_rcv(sk
, skb
);
946 static inline void sk_incoming_cpu_update(struct sock
*sk
)
948 int cpu
= raw_smp_processor_id();
950 if (unlikely(sk
->sk_incoming_cpu
!= cpu
))
951 sk
->sk_incoming_cpu
= cpu
;
954 static inline void sock_rps_record_flow_hash(__u32 hash
)
957 struct rps_sock_flow_table
*sock_flow_table
;
960 sock_flow_table
= rcu_dereference(rps_sock_flow_table
);
961 rps_record_sock_flow(sock_flow_table
, hash
);
966 static inline void sock_rps_record_flow(const struct sock
*sk
)
969 if (static_key_false(&rfs_needed
)) {
970 /* Reading sk->sk_rxhash might incur an expensive cache line
973 * TCP_ESTABLISHED does cover almost all states where RFS
974 * might be useful, and is cheaper [1] than testing :
975 * IPv4: inet_sk(sk)->inet_daddr
976 * IPv6: ipv6_addr_any(&sk->sk_v6_daddr)
977 * OR an additional socket flag
978 * [1] : sk_state and sk_prot are in the same cache line.
980 if (sk
->sk_state
== TCP_ESTABLISHED
)
981 sock_rps_record_flow_hash(sk
->sk_rxhash
);
986 static inline void sock_rps_save_rxhash(struct sock
*sk
,
987 const struct sk_buff
*skb
)
990 if (unlikely(sk
->sk_rxhash
!= skb
->hash
))
991 sk
->sk_rxhash
= skb
->hash
;
995 static inline void sock_rps_reset_rxhash(struct sock
*sk
)
1002 #define sk_wait_event(__sk, __timeo, __condition, __wait) \
1004 release_sock(__sk); \
1005 __rc = __condition; \
1007 *(__timeo) = wait_woken(__wait, \
1008 TASK_INTERRUPTIBLE, \
1011 sched_annotate_sleep(); \
1013 __rc = __condition; \
1017 int sk_stream_wait_connect(struct sock
*sk
, long *timeo_p
);
1018 int sk_stream_wait_memory(struct sock
*sk
, long *timeo_p
);
1019 void sk_stream_wait_close(struct sock
*sk
, long timeo_p
);
1020 int sk_stream_error(struct sock
*sk
, int flags
, int err
);
1021 void sk_stream_kill_queues(struct sock
*sk
);
1022 void sk_set_memalloc(struct sock
*sk
);
1023 void sk_clear_memalloc(struct sock
*sk
);
1025 void __sk_flush_backlog(struct sock
*sk
);
1027 static inline bool sk_flush_backlog(struct sock
*sk
)
1029 if (unlikely(READ_ONCE(sk
->sk_backlog
.tail
))) {
1030 __sk_flush_backlog(sk
);
1036 int sk_wait_data(struct sock
*sk
, long *timeo
, const struct sk_buff
*skb
);
1038 struct request_sock_ops
;
1039 struct timewait_sock_ops
;
1040 struct inet_hashinfo
;
1041 struct raw_hashinfo
;
1042 struct smc_hashinfo
;
1046 * caches using SLAB_TYPESAFE_BY_RCU should let .next pointer from nulls nodes
1047 * un-modified. Special care is taken when initializing object to zero.
1049 static inline void sk_prot_clear_nulls(struct sock
*sk
, int size
)
1051 if (offsetof(struct sock
, sk_node
.next
) != 0)
1052 memset(sk
, 0, offsetof(struct sock
, sk_node
.next
));
1053 memset(&sk
->sk_node
.pprev
, 0,
1054 size
- offsetof(struct sock
, sk_node
.pprev
));
1057 /* Networking protocol blocks we attach to sockets.
1058 * socket layer -> transport layer interface
1061 void (*close
)(struct sock
*sk
,
1063 int (*pre_connect
)(struct sock
*sk
,
1064 struct sockaddr
*uaddr
,
1066 int (*connect
)(struct sock
*sk
,
1067 struct sockaddr
*uaddr
,
1069 int (*disconnect
)(struct sock
*sk
, int flags
);
1071 struct sock
* (*accept
)(struct sock
*sk
, int flags
, int *err
,
1074 int (*ioctl
)(struct sock
*sk
, int cmd
,
1076 int (*init
)(struct sock
*sk
);
1077 void (*destroy
)(struct sock
*sk
);
1078 void (*shutdown
)(struct sock
*sk
, int how
);
1079 int (*setsockopt
)(struct sock
*sk
, int level
,
1080 int optname
, char __user
*optval
,
1081 unsigned int optlen
);
1082 int (*getsockopt
)(struct sock
*sk
, int level
,
1083 int optname
, char __user
*optval
,
1084 int __user
*option
);
1085 void (*keepalive
)(struct sock
*sk
, int valbool
);
1086 #ifdef CONFIG_COMPAT
1087 int (*compat_setsockopt
)(struct sock
*sk
,
1089 int optname
, char __user
*optval
,
1090 unsigned int optlen
);
1091 int (*compat_getsockopt
)(struct sock
*sk
,
1093 int optname
, char __user
*optval
,
1094 int __user
*option
);
1095 int (*compat_ioctl
)(struct sock
*sk
,
1096 unsigned int cmd
, unsigned long arg
);
1098 int (*sendmsg
)(struct sock
*sk
, struct msghdr
*msg
,
1100 int (*recvmsg
)(struct sock
*sk
, struct msghdr
*msg
,
1101 size_t len
, int noblock
, int flags
,
1103 int (*sendpage
)(struct sock
*sk
, struct page
*page
,
1104 int offset
, size_t size
, int flags
);
1105 int (*bind
)(struct sock
*sk
,
1106 struct sockaddr
*uaddr
, int addr_len
);
1108 int (*backlog_rcv
) (struct sock
*sk
,
1109 struct sk_buff
*skb
);
1111 void (*release_cb
)(struct sock
*sk
);
1113 /* Keeping track of sk's, looking them up, and port selection methods. */
1114 int (*hash
)(struct sock
*sk
);
1115 void (*unhash
)(struct sock
*sk
);
1116 void (*rehash
)(struct sock
*sk
);
1117 int (*get_port
)(struct sock
*sk
, unsigned short snum
);
1119 /* Keeping track of sockets in use */
1120 #ifdef CONFIG_PROC_FS
1121 unsigned int inuse_idx
;
1124 bool (*stream_memory_free
)(const struct sock
*sk
, int wake
);
1125 bool (*stream_memory_read
)(const struct sock
*sk
);
1126 /* Memory pressure */
1127 void (*enter_memory_pressure
)(struct sock
*sk
);
1128 void (*leave_memory_pressure
)(struct sock
*sk
);
1129 atomic_long_t
*memory_allocated
; /* Current allocated memory. */
1130 struct percpu_counter
*sockets_allocated
; /* Current number of sockets. */
1132 * Pressure flag: try to collapse.
1133 * Technical note: it is used by multiple contexts non atomically.
1134 * All the __sk_mem_schedule() is of this nature: accounting
1135 * is strict, actions are advisory and have some latency.
1137 unsigned long *memory_pressure
;
1142 u32 sysctl_wmem_offset
;
1143 u32 sysctl_rmem_offset
;
1148 struct kmem_cache
*slab
;
1149 unsigned int obj_size
;
1150 slab_flags_t slab_flags
;
1151 unsigned int useroffset
; /* Usercopy region offset */
1152 unsigned int usersize
; /* Usercopy region size */
1154 struct percpu_counter
*orphan_count
;
1156 struct request_sock_ops
*rsk_prot
;
1157 struct timewait_sock_ops
*twsk_prot
;
1160 struct inet_hashinfo
*hashinfo
;
1161 struct udp_table
*udp_table
;
1162 struct raw_hashinfo
*raw_hash
;
1163 struct smc_hashinfo
*smc_hash
;
1166 struct module
*owner
;
1170 struct list_head node
;
1171 #ifdef SOCK_REFCNT_DEBUG
1174 int (*diag_destroy
)(struct sock
*sk
, int err
);
1175 } __randomize_layout
;
1177 int proto_register(struct proto
*prot
, int alloc_slab
);
1178 void proto_unregister(struct proto
*prot
);
1179 int sock_load_diag_module(int family
, int protocol
);
1181 #ifdef SOCK_REFCNT_DEBUG
1182 static inline void sk_refcnt_debug_inc(struct sock
*sk
)
1184 atomic_inc(&sk
->sk_prot
->socks
);
1187 static inline void sk_refcnt_debug_dec(struct sock
*sk
)
1189 atomic_dec(&sk
->sk_prot
->socks
);
1190 printk(KERN_DEBUG
"%s socket %p released, %d are still alive\n",
1191 sk
->sk_prot
->name
, sk
, atomic_read(&sk
->sk_prot
->socks
));
1194 static inline void sk_refcnt_debug_release(const struct sock
*sk
)
1196 if (refcount_read(&sk
->sk_refcnt
) != 1)
1197 printk(KERN_DEBUG
"Destruction of the %s socket %p delayed, refcnt=%d\n",
1198 sk
->sk_prot
->name
, sk
, refcount_read(&sk
->sk_refcnt
));
1200 #else /* SOCK_REFCNT_DEBUG */
1201 #define sk_refcnt_debug_inc(sk) do { } while (0)
1202 #define sk_refcnt_debug_dec(sk) do { } while (0)
1203 #define sk_refcnt_debug_release(sk) do { } while (0)
1204 #endif /* SOCK_REFCNT_DEBUG */
1206 static inline bool __sk_stream_memory_free(const struct sock
*sk
, int wake
)
1208 if (sk
->sk_wmem_queued
>= sk
->sk_sndbuf
)
1211 return sk
->sk_prot
->stream_memory_free
?
1212 sk
->sk_prot
->stream_memory_free(sk
, wake
) : true;
1215 static inline bool sk_stream_memory_free(const struct sock
*sk
)
1217 return __sk_stream_memory_free(sk
, 0);
1220 static inline bool __sk_stream_is_writeable(const struct sock
*sk
, int wake
)
1222 return sk_stream_wspace(sk
) >= sk_stream_min_wspace(sk
) &&
1223 __sk_stream_memory_free(sk
, wake
);
1226 static inline bool sk_stream_is_writeable(const struct sock
*sk
)
1228 return __sk_stream_is_writeable(sk
, 0);
1231 static inline int sk_under_cgroup_hierarchy(struct sock
*sk
,
1232 struct cgroup
*ancestor
)
1234 #ifdef CONFIG_SOCK_CGROUP_DATA
1235 return cgroup_is_descendant(sock_cgroup_ptr(&sk
->sk_cgrp_data
),
1242 static inline bool sk_has_memory_pressure(const struct sock
*sk
)
1244 return sk
->sk_prot
->memory_pressure
!= NULL
;
1247 static inline bool sk_under_memory_pressure(const struct sock
*sk
)
1249 if (!sk
->sk_prot
->memory_pressure
)
1252 if (mem_cgroup_sockets_enabled
&& sk
->sk_memcg
&&
1253 mem_cgroup_under_socket_pressure(sk
->sk_memcg
))
1256 return !!*sk
->sk_prot
->memory_pressure
;
1260 sk_memory_allocated(const struct sock
*sk
)
1262 return atomic_long_read(sk
->sk_prot
->memory_allocated
);
1266 sk_memory_allocated_add(struct sock
*sk
, int amt
)
1268 return atomic_long_add_return(amt
, sk
->sk_prot
->memory_allocated
);
1272 sk_memory_allocated_sub(struct sock
*sk
, int amt
)
1274 atomic_long_sub(amt
, sk
->sk_prot
->memory_allocated
);
1277 static inline void sk_sockets_allocated_dec(struct sock
*sk
)
1279 percpu_counter_dec(sk
->sk_prot
->sockets_allocated
);
1282 static inline void sk_sockets_allocated_inc(struct sock
*sk
)
1284 percpu_counter_inc(sk
->sk_prot
->sockets_allocated
);
1288 sk_sockets_allocated_read_positive(struct sock
*sk
)
1290 return percpu_counter_read_positive(sk
->sk_prot
->sockets_allocated
);
1294 proto_sockets_allocated_sum_positive(struct proto
*prot
)
1296 return percpu_counter_sum_positive(prot
->sockets_allocated
);
1300 proto_memory_allocated(struct proto
*prot
)
1302 return atomic_long_read(prot
->memory_allocated
);
1306 proto_memory_pressure(struct proto
*prot
)
1308 if (!prot
->memory_pressure
)
1310 return !!*prot
->memory_pressure
;
1314 #ifdef CONFIG_PROC_FS
1315 /* Called with local bh disabled */
1316 void sock_prot_inuse_add(struct net
*net
, struct proto
*prot
, int inc
);
1317 int sock_prot_inuse_get(struct net
*net
, struct proto
*proto
);
1318 int sock_inuse_get(struct net
*net
);
1320 static inline void sock_prot_inuse_add(struct net
*net
, struct proto
*prot
,
1327 /* With per-bucket locks this operation is not-atomic, so that
1328 * this version is not worse.
1330 static inline int __sk_prot_rehash(struct sock
*sk
)
1332 sk
->sk_prot
->unhash(sk
);
1333 return sk
->sk_prot
->hash(sk
);
1336 /* About 10 seconds */
1337 #define SOCK_DESTROY_TIME (10*HZ)
1339 /* Sockets 0-1023 can't be bound to unless you are superuser */
1340 #define PROT_SOCK 1024
1342 #define SHUTDOWN_MASK 3
1343 #define RCV_SHUTDOWN 1
1344 #define SEND_SHUTDOWN 2
1346 #define SOCK_SNDBUF_LOCK 1
1347 #define SOCK_RCVBUF_LOCK 2
1348 #define SOCK_BINDADDR_LOCK 4
1349 #define SOCK_BINDPORT_LOCK 8
1351 struct socket_alloc
{
1352 struct socket socket
;
1353 struct inode vfs_inode
;
1356 static inline struct socket
*SOCKET_I(struct inode
*inode
)
1358 return &container_of(inode
, struct socket_alloc
, vfs_inode
)->socket
;
1361 static inline struct inode
*SOCK_INODE(struct socket
*socket
)
1363 return &container_of(socket
, struct socket_alloc
, socket
)->vfs_inode
;
1367 * Functions for memory accounting
1369 int __sk_mem_raise_allocated(struct sock
*sk
, int size
, int amt
, int kind
);
1370 int __sk_mem_schedule(struct sock
*sk
, int size
, int kind
);
1371 void __sk_mem_reduce_allocated(struct sock
*sk
, int amount
);
1372 void __sk_mem_reclaim(struct sock
*sk
, int amount
);
1374 /* We used to have PAGE_SIZE here, but systems with 64KB pages
1375 * do not necessarily have 16x time more memory than 4KB ones.
1377 #define SK_MEM_QUANTUM 4096
1378 #define SK_MEM_QUANTUM_SHIFT ilog2(SK_MEM_QUANTUM)
1379 #define SK_MEM_SEND 0
1380 #define SK_MEM_RECV 1
1382 /* sysctl_mem values are in pages, we convert them in SK_MEM_QUANTUM units */
1383 static inline long sk_prot_mem_limits(const struct sock
*sk
, int index
)
1385 long val
= sk
->sk_prot
->sysctl_mem
[index
];
1387 #if PAGE_SIZE > SK_MEM_QUANTUM
1388 val
<<= PAGE_SHIFT
- SK_MEM_QUANTUM_SHIFT
;
1389 #elif PAGE_SIZE < SK_MEM_QUANTUM
1390 val
>>= SK_MEM_QUANTUM_SHIFT
- PAGE_SHIFT
;
1395 static inline int sk_mem_pages(int amt
)
1397 return (amt
+ SK_MEM_QUANTUM
- 1) >> SK_MEM_QUANTUM_SHIFT
;
1400 static inline bool sk_has_account(struct sock
*sk
)
1402 /* return true if protocol supports memory accounting */
1403 return !!sk
->sk_prot
->memory_allocated
;
1406 static inline bool sk_wmem_schedule(struct sock
*sk
, int size
)
1408 if (!sk_has_account(sk
))
1410 return size
<= sk
->sk_forward_alloc
||
1411 __sk_mem_schedule(sk
, size
, SK_MEM_SEND
);
1415 sk_rmem_schedule(struct sock
*sk
, struct sk_buff
*skb
, int size
)
1417 if (!sk_has_account(sk
))
1419 return size
<= sk
->sk_forward_alloc
||
1420 __sk_mem_schedule(sk
, size
, SK_MEM_RECV
) ||
1421 skb_pfmemalloc(skb
);
1424 static inline void sk_mem_reclaim(struct sock
*sk
)
1426 if (!sk_has_account(sk
))
1428 if (sk
->sk_forward_alloc
>= SK_MEM_QUANTUM
)
1429 __sk_mem_reclaim(sk
, sk
->sk_forward_alloc
);
1432 static inline void sk_mem_reclaim_partial(struct sock
*sk
)
1434 if (!sk_has_account(sk
))
1436 if (sk
->sk_forward_alloc
> SK_MEM_QUANTUM
)
1437 __sk_mem_reclaim(sk
, sk
->sk_forward_alloc
- 1);
1440 static inline void sk_mem_charge(struct sock
*sk
, int size
)
1442 if (!sk_has_account(sk
))
1444 sk
->sk_forward_alloc
-= size
;
1447 static inline void sk_mem_uncharge(struct sock
*sk
, int size
)
1449 if (!sk_has_account(sk
))
1451 sk
->sk_forward_alloc
+= size
;
1453 /* Avoid a possible overflow.
1454 * TCP send queues can make this happen, if sk_mem_reclaim()
1455 * is not called and more than 2 GBytes are released at once.
1457 * If we reach 2 MBytes, reclaim 1 MBytes right now, there is
1458 * no need to hold that much forward allocation anyway.
1460 if (unlikely(sk
->sk_forward_alloc
>= 1 << 21))
1461 __sk_mem_reclaim(sk
, 1 << 20);
1464 static inline void sk_wmem_free_skb(struct sock
*sk
, struct sk_buff
*skb
)
1466 sock_set_flag(sk
, SOCK_QUEUE_SHRUNK
);
1467 sk
->sk_wmem_queued
-= skb
->truesize
;
1468 sk_mem_uncharge(sk
, skb
->truesize
);
1472 static inline void sock_release_ownership(struct sock
*sk
)
1474 if (sk
->sk_lock
.owned
) {
1475 sk
->sk_lock
.owned
= 0;
1477 /* The sk_lock has mutex_unlock() semantics: */
1478 mutex_release(&sk
->sk_lock
.dep_map
, 1, _RET_IP_
);
1483 * Macro so as to not evaluate some arguments when
1484 * lockdep is not enabled.
1486 * Mark both the sk_lock and the sk_lock.slock as a
1487 * per-address-family lock class.
1489 #define sock_lock_init_class_and_name(sk, sname, skey, name, key) \
1491 sk->sk_lock.owned = 0; \
1492 init_waitqueue_head(&sk->sk_lock.wq); \
1493 spin_lock_init(&(sk)->sk_lock.slock); \
1494 debug_check_no_locks_freed((void *)&(sk)->sk_lock, \
1495 sizeof((sk)->sk_lock)); \
1496 lockdep_set_class_and_name(&(sk)->sk_lock.slock, \
1498 lockdep_init_map(&(sk)->sk_lock.dep_map, (name), (key), 0); \
1501 #ifdef CONFIG_LOCKDEP
1502 static inline bool lockdep_sock_is_held(const struct sock
*sk
)
1504 return lockdep_is_held(&sk
->sk_lock
) ||
1505 lockdep_is_held(&sk
->sk_lock
.slock
);
1509 void lock_sock_nested(struct sock
*sk
, int subclass
);
1511 static inline void lock_sock(struct sock
*sk
)
1513 lock_sock_nested(sk
, 0);
1516 void __release_sock(struct sock
*sk
);
1517 void release_sock(struct sock
*sk
);
1519 /* BH context may only use the following locking interface. */
1520 #define bh_lock_sock(__sk) spin_lock(&((__sk)->sk_lock.slock))
1521 #define bh_lock_sock_nested(__sk) \
1522 spin_lock_nested(&((__sk)->sk_lock.slock), \
1523 SINGLE_DEPTH_NESTING)
1524 #define bh_unlock_sock(__sk) spin_unlock(&((__sk)->sk_lock.slock))
1526 bool lock_sock_fast(struct sock
*sk
);
1528 * unlock_sock_fast - complement of lock_sock_fast
1532 * fast unlock socket for user context.
1533 * If slow mode is on, we call regular release_sock()
1535 static inline void unlock_sock_fast(struct sock
*sk
, bool slow
)
1540 spin_unlock_bh(&sk
->sk_lock
.slock
);
1543 /* Used by processes to "lock" a socket state, so that
1544 * interrupts and bottom half handlers won't change it
1545 * from under us. It essentially blocks any incoming
1546 * packets, so that we won't get any new data or any
1547 * packets that change the state of the socket.
1549 * While locked, BH processing will add new packets to
1550 * the backlog queue. This queue is processed by the
1551 * owner of the socket lock right before it is released.
1553 * Since ~2.3.5 it is also exclusive sleep lock serializing
1554 * accesses from user process context.
1557 static inline void sock_owned_by_me(const struct sock
*sk
)
1559 #ifdef CONFIG_LOCKDEP
1560 WARN_ON_ONCE(!lockdep_sock_is_held(sk
) && debug_locks
);
1564 static inline bool sock_owned_by_user(const struct sock
*sk
)
1566 sock_owned_by_me(sk
);
1567 return sk
->sk_lock
.owned
;
1570 static inline bool sock_owned_by_user_nocheck(const struct sock
*sk
)
1572 return sk
->sk_lock
.owned
;
1575 /* no reclassification while locks are held */
1576 static inline bool sock_allow_reclassification(const struct sock
*csk
)
1578 struct sock
*sk
= (struct sock
*)csk
;
1580 return !sk
->sk_lock
.owned
&& !spin_is_locked(&sk
->sk_lock
.slock
);
1583 struct sock
*sk_alloc(struct net
*net
, int family
, gfp_t priority
,
1584 struct proto
*prot
, int kern
);
1585 void sk_free(struct sock
*sk
);
1586 void sk_destruct(struct sock
*sk
);
1587 struct sock
*sk_clone_lock(const struct sock
*sk
, const gfp_t priority
);
1588 void sk_free_unlock_clone(struct sock
*sk
);
1590 struct sk_buff
*sock_wmalloc(struct sock
*sk
, unsigned long size
, int force
,
1592 void __sock_wfree(struct sk_buff
*skb
);
1593 void sock_wfree(struct sk_buff
*skb
);
1594 struct sk_buff
*sock_omalloc(struct sock
*sk
, unsigned long size
,
1596 void skb_orphan_partial(struct sk_buff
*skb
);
1597 void sock_rfree(struct sk_buff
*skb
);
1598 void sock_efree(struct sk_buff
*skb
);
1600 void sock_edemux(struct sk_buff
*skb
);
1602 #define sock_edemux sock_efree
1605 int sock_setsockopt(struct socket
*sock
, int level
, int op
,
1606 char __user
*optval
, unsigned int optlen
);
1608 int sock_getsockopt(struct socket
*sock
, int level
, int op
,
1609 char __user
*optval
, int __user
*optlen
);
1610 struct sk_buff
*sock_alloc_send_skb(struct sock
*sk
, unsigned long size
,
1611 int noblock
, int *errcode
);
1612 struct sk_buff
*sock_alloc_send_pskb(struct sock
*sk
, unsigned long header_len
,
1613 unsigned long data_len
, int noblock
,
1614 int *errcode
, int max_page_order
);
1615 void *sock_kmalloc(struct sock
*sk
, int size
, gfp_t priority
);
1616 void sock_kfree_s(struct sock
*sk
, void *mem
, int size
);
1617 void sock_kzfree_s(struct sock
*sk
, void *mem
, int size
);
1618 void sk_send_sigurg(struct sock
*sk
);
1620 struct sockcm_cookie
{
1626 static inline void sockcm_init(struct sockcm_cookie
*sockc
,
1627 const struct sock
*sk
)
1629 *sockc
= (struct sockcm_cookie
) { .tsflags
= sk
->sk_tsflags
};
1632 int __sock_cmsg_send(struct sock
*sk
, struct msghdr
*msg
, struct cmsghdr
*cmsg
,
1633 struct sockcm_cookie
*sockc
);
1634 int sock_cmsg_send(struct sock
*sk
, struct msghdr
*msg
,
1635 struct sockcm_cookie
*sockc
);
1638 * Functions to fill in entries in struct proto_ops when a protocol
1639 * does not implement a particular function.
1641 int sock_no_bind(struct socket
*, struct sockaddr
*, int);
1642 int sock_no_connect(struct socket
*, struct sockaddr
*, int, int);
1643 int sock_no_socketpair(struct socket
*, struct socket
*);
1644 int sock_no_accept(struct socket
*, struct socket
*, int, bool);
1645 int sock_no_getname(struct socket
*, struct sockaddr
*, int);
1646 int sock_no_ioctl(struct socket
*, unsigned int, unsigned long);
1647 int sock_no_listen(struct socket
*, int);
1648 int sock_no_shutdown(struct socket
*, int);
1649 int sock_no_getsockopt(struct socket
*, int , int, char __user
*, int __user
*);
1650 int sock_no_setsockopt(struct socket
*, int, int, char __user
*, unsigned int);
1651 int sock_no_sendmsg(struct socket
*, struct msghdr
*, size_t);
1652 int sock_no_sendmsg_locked(struct sock
*sk
, struct msghdr
*msg
, size_t len
);
1653 int sock_no_recvmsg(struct socket
*, struct msghdr
*, size_t, int);
1654 int sock_no_mmap(struct file
*file
, struct socket
*sock
,
1655 struct vm_area_struct
*vma
);
1656 ssize_t
sock_no_sendpage(struct socket
*sock
, struct page
*page
, int offset
,
1657 size_t size
, int flags
);
1658 ssize_t
sock_no_sendpage_locked(struct sock
*sk
, struct page
*page
,
1659 int offset
, size_t size
, int flags
);
1662 * Functions to fill in entries in struct proto_ops when a protocol
1663 * uses the inet style.
1665 int sock_common_getsockopt(struct socket
*sock
, int level
, int optname
,
1666 char __user
*optval
, int __user
*optlen
);
1667 int sock_common_recvmsg(struct socket
*sock
, struct msghdr
*msg
, size_t size
,
1669 int sock_common_setsockopt(struct socket
*sock
, int level
, int optname
,
1670 char __user
*optval
, unsigned int optlen
);
1671 int compat_sock_common_getsockopt(struct socket
*sock
, int level
,
1672 int optname
, char __user
*optval
, int __user
*optlen
);
1673 int compat_sock_common_setsockopt(struct socket
*sock
, int level
,
1674 int optname
, char __user
*optval
, unsigned int optlen
);
1676 void sk_common_release(struct sock
*sk
);
1679 * Default socket callbacks and setup code
1682 /* Initialise core socket variables */
1683 void sock_init_data(struct socket
*sock
, struct sock
*sk
);
1686 * Socket reference counting postulates.
1688 * * Each user of socket SHOULD hold a reference count.
1689 * * Each access point to socket (an hash table bucket, reference from a list,
1690 * running timer, skb in flight MUST hold a reference count.
1691 * * When reference count hits 0, it means it will never increase back.
1692 * * When reference count hits 0, it means that no references from
1693 * outside exist to this socket and current process on current CPU
1694 * is last user and may/should destroy this socket.
1695 * * sk_free is called from any context: process, BH, IRQ. When
1696 * it is called, socket has no references from outside -> sk_free
1697 * may release descendant resources allocated by the socket, but
1698 * to the time when it is called, socket is NOT referenced by any
1699 * hash tables, lists etc.
1700 * * Packets, delivered from outside (from network or from another process)
1701 * and enqueued on receive/error queues SHOULD NOT grab reference count,
1702 * when they sit in queue. Otherwise, packets will leak to hole, when
1703 * socket is looked up by one cpu and unhasing is made by another CPU.
1704 * It is true for udp/raw, netlink (leak to receive and error queues), tcp
1705 * (leak to backlog). Packet socket does all the processing inside
1706 * BR_NETPROTO_LOCK, so that it has not this race condition. UNIX sockets
1707 * use separate SMP lock, so that they are prone too.
1710 /* Ungrab socket and destroy it, if it was the last reference. */
1711 static inline void sock_put(struct sock
*sk
)
1713 if (refcount_dec_and_test(&sk
->sk_refcnt
))
1716 /* Generic version of sock_put(), dealing with all sockets
1717 * (TCP_TIMEWAIT, TCP_NEW_SYN_RECV, ESTABLISHED...)
1719 void sock_gen_put(struct sock
*sk
);
1721 int __sk_receive_skb(struct sock
*sk
, struct sk_buff
*skb
, const int nested
,
1722 unsigned int trim_cap
, bool refcounted
);
1723 static inline int sk_receive_skb(struct sock
*sk
, struct sk_buff
*skb
,
1726 return __sk_receive_skb(sk
, skb
, nested
, 1, true);
1729 static inline void sk_tx_queue_set(struct sock
*sk
, int tx_queue
)
1731 /* sk_tx_queue_mapping accept only upto a 16-bit value */
1732 if (WARN_ON_ONCE((unsigned short)tx_queue
>= USHRT_MAX
))
1734 sk
->sk_tx_queue_mapping
= tx_queue
;
1737 #define NO_QUEUE_MAPPING USHRT_MAX
1739 static inline void sk_tx_queue_clear(struct sock
*sk
)
1741 sk
->sk_tx_queue_mapping
= NO_QUEUE_MAPPING
;
1744 static inline int sk_tx_queue_get(const struct sock
*sk
)
1746 if (sk
&& sk
->sk_tx_queue_mapping
!= NO_QUEUE_MAPPING
)
1747 return sk
->sk_tx_queue_mapping
;
1752 static inline void sk_rx_queue_set(struct sock
*sk
, const struct sk_buff
*skb
)
1755 if (skb_rx_queue_recorded(skb
)) {
1756 u16 rx_queue
= skb_get_rx_queue(skb
);
1758 if (WARN_ON_ONCE(rx_queue
== NO_QUEUE_MAPPING
))
1761 sk
->sk_rx_queue_mapping
= rx_queue
;
1766 static inline void sk_rx_queue_clear(struct sock
*sk
)
1769 sk
->sk_rx_queue_mapping
= NO_QUEUE_MAPPING
;
1774 static inline int sk_rx_queue_get(const struct sock
*sk
)
1776 if (sk
&& sk
->sk_rx_queue_mapping
!= NO_QUEUE_MAPPING
)
1777 return sk
->sk_rx_queue_mapping
;
1783 static inline void sk_set_socket(struct sock
*sk
, struct socket
*sock
)
1785 sk_tx_queue_clear(sk
);
1786 sk
->sk_socket
= sock
;
1789 static inline wait_queue_head_t
*sk_sleep(struct sock
*sk
)
1791 BUILD_BUG_ON(offsetof(struct socket_wq
, wait
) != 0);
1792 return &rcu_dereference_raw(sk
->sk_wq
)->wait
;
1794 /* Detach socket from process context.
1795 * Announce socket dead, detach it from wait queue and inode.
1796 * Note that parent inode held reference count on this struct sock,
1797 * we do not release it in this function, because protocol
1798 * probably wants some additional cleanups or even continuing
1799 * to work with this socket (TCP).
1801 static inline void sock_orphan(struct sock
*sk
)
1803 write_lock_bh(&sk
->sk_callback_lock
);
1804 sock_set_flag(sk
, SOCK_DEAD
);
1805 sk_set_socket(sk
, NULL
);
1807 write_unlock_bh(&sk
->sk_callback_lock
);
1810 static inline void sock_graft(struct sock
*sk
, struct socket
*parent
)
1812 WARN_ON(parent
->sk
);
1813 write_lock_bh(&sk
->sk_callback_lock
);
1814 rcu_assign_pointer(sk
->sk_wq
, parent
->wq
);
1816 sk_set_socket(sk
, parent
);
1817 sk
->sk_uid
= SOCK_INODE(parent
)->i_uid
;
1818 security_sock_graft(sk
, parent
);
1819 write_unlock_bh(&sk
->sk_callback_lock
);
1822 kuid_t
sock_i_uid(struct sock
*sk
);
1823 unsigned long sock_i_ino(struct sock
*sk
);
1825 static inline kuid_t
sock_net_uid(const struct net
*net
, const struct sock
*sk
)
1827 return sk
? sk
->sk_uid
: make_kuid(net
->user_ns
, 0);
1830 static inline u32
net_tx_rndhash(void)
1832 u32 v
= prandom_u32();
1837 static inline void sk_set_txhash(struct sock
*sk
)
1839 sk
->sk_txhash
= net_tx_rndhash();
1842 static inline void sk_rethink_txhash(struct sock
*sk
)
1848 static inline struct dst_entry
*
1849 __sk_dst_get(struct sock
*sk
)
1851 return rcu_dereference_check(sk
->sk_dst_cache
,
1852 lockdep_sock_is_held(sk
));
1855 static inline struct dst_entry
*
1856 sk_dst_get(struct sock
*sk
)
1858 struct dst_entry
*dst
;
1861 dst
= rcu_dereference(sk
->sk_dst_cache
);
1862 if (dst
&& !atomic_inc_not_zero(&dst
->__refcnt
))
1868 static inline void dst_negative_advice(struct sock
*sk
)
1870 struct dst_entry
*ndst
, *dst
= __sk_dst_get(sk
);
1872 sk_rethink_txhash(sk
);
1874 if (dst
&& dst
->ops
->negative_advice
) {
1875 ndst
= dst
->ops
->negative_advice(dst
);
1878 rcu_assign_pointer(sk
->sk_dst_cache
, ndst
);
1879 sk_tx_queue_clear(sk
);
1880 sk
->sk_dst_pending_confirm
= 0;
1886 __sk_dst_set(struct sock
*sk
, struct dst_entry
*dst
)
1888 struct dst_entry
*old_dst
;
1890 sk_tx_queue_clear(sk
);
1891 sk
->sk_dst_pending_confirm
= 0;
1892 old_dst
= rcu_dereference_protected(sk
->sk_dst_cache
,
1893 lockdep_sock_is_held(sk
));
1894 rcu_assign_pointer(sk
->sk_dst_cache
, dst
);
1895 dst_release(old_dst
);
1899 sk_dst_set(struct sock
*sk
, struct dst_entry
*dst
)
1901 struct dst_entry
*old_dst
;
1903 sk_tx_queue_clear(sk
);
1904 sk
->sk_dst_pending_confirm
= 0;
1905 old_dst
= xchg((__force
struct dst_entry
**)&sk
->sk_dst_cache
, dst
);
1906 dst_release(old_dst
);
1910 __sk_dst_reset(struct sock
*sk
)
1912 __sk_dst_set(sk
, NULL
);
1916 sk_dst_reset(struct sock
*sk
)
1918 sk_dst_set(sk
, NULL
);
1921 struct dst_entry
*__sk_dst_check(struct sock
*sk
, u32 cookie
);
1923 struct dst_entry
*sk_dst_check(struct sock
*sk
, u32 cookie
);
1925 static inline void sk_dst_confirm(struct sock
*sk
)
1927 if (!sk
->sk_dst_pending_confirm
)
1928 sk
->sk_dst_pending_confirm
= 1;
1931 static inline void sock_confirm_neigh(struct sk_buff
*skb
, struct neighbour
*n
)
1933 if (skb_get_dst_pending_confirm(skb
)) {
1934 struct sock
*sk
= skb
->sk
;
1935 unsigned long now
= jiffies
;
1937 /* avoid dirtying neighbour */
1938 if (n
->confirmed
!= now
)
1940 if (sk
&& sk
->sk_dst_pending_confirm
)
1941 sk
->sk_dst_pending_confirm
= 0;
1945 bool sk_mc_loop(struct sock
*sk
);
1947 static inline bool sk_can_gso(const struct sock
*sk
)
1949 return net_gso_ok(sk
->sk_route_caps
, sk
->sk_gso_type
);
1952 void sk_setup_caps(struct sock
*sk
, struct dst_entry
*dst
);
1954 static inline void sk_nocaps_add(struct sock
*sk
, netdev_features_t flags
)
1956 sk
->sk_route_nocaps
|= flags
;
1957 sk
->sk_route_caps
&= ~flags
;
1960 static inline int skb_do_copy_data_nocache(struct sock
*sk
, struct sk_buff
*skb
,
1961 struct iov_iter
*from
, char *to
,
1962 int copy
, int offset
)
1964 if (skb
->ip_summed
== CHECKSUM_NONE
) {
1966 if (!csum_and_copy_from_iter_full(to
, copy
, &csum
, from
))
1968 skb
->csum
= csum_block_add(skb
->csum
, csum
, offset
);
1969 } else if (sk
->sk_route_caps
& NETIF_F_NOCACHE_COPY
) {
1970 if (!copy_from_iter_full_nocache(to
, copy
, from
))
1972 } else if (!copy_from_iter_full(to
, copy
, from
))
1978 static inline int skb_add_data_nocache(struct sock
*sk
, struct sk_buff
*skb
,
1979 struct iov_iter
*from
, int copy
)
1981 int err
, offset
= skb
->len
;
1983 err
= skb_do_copy_data_nocache(sk
, skb
, from
, skb_put(skb
, copy
),
1986 __skb_trim(skb
, offset
);
1991 static inline int skb_copy_to_page_nocache(struct sock
*sk
, struct iov_iter
*from
,
1992 struct sk_buff
*skb
,
1998 err
= skb_do_copy_data_nocache(sk
, skb
, from
, page_address(page
) + off
,
2004 skb
->data_len
+= copy
;
2005 skb
->truesize
+= copy
;
2006 sk
->sk_wmem_queued
+= copy
;
2007 sk_mem_charge(sk
, copy
);
2012 * sk_wmem_alloc_get - returns write allocations
2015 * Returns sk_wmem_alloc minus initial offset of one
2017 static inline int sk_wmem_alloc_get(const struct sock
*sk
)
2019 return refcount_read(&sk
->sk_wmem_alloc
) - 1;
2023 * sk_rmem_alloc_get - returns read allocations
2026 * Returns sk_rmem_alloc
2028 static inline int sk_rmem_alloc_get(const struct sock
*sk
)
2030 return atomic_read(&sk
->sk_rmem_alloc
);
2034 * sk_has_allocations - check if allocations are outstanding
2037 * Returns true if socket has write or read allocations
2039 static inline bool sk_has_allocations(const struct sock
*sk
)
2041 return sk_wmem_alloc_get(sk
) || sk_rmem_alloc_get(sk
);
2045 * skwq_has_sleeper - check if there are any waiting processes
2046 * @wq: struct socket_wq
2048 * Returns true if socket_wq has waiting processes
2050 * The purpose of the skwq_has_sleeper and sock_poll_wait is to wrap the memory
2051 * barrier call. They were added due to the race found within the tcp code.
2053 * Consider following tcp code paths::
2056 * sys_select receive packet
2058 * __add_wait_queue update tp->rcv_nxt
2060 * tp->rcv_nxt check sock_def_readable
2062 * schedule rcu_read_lock();
2063 * wq = rcu_dereference(sk->sk_wq);
2064 * if (wq && waitqueue_active(&wq->wait))
2065 * wake_up_interruptible(&wq->wait)
2069 * The race for tcp fires when the __add_wait_queue changes done by CPU1 stay
2070 * in its cache, and so does the tp->rcv_nxt update on CPU2 side. The CPU1
2071 * could then endup calling schedule and sleep forever if there are no more
2072 * data on the socket.
2075 static inline bool skwq_has_sleeper(struct socket_wq
*wq
)
2077 return wq
&& wq_has_sleeper(&wq
->wait
);
2081 * sock_poll_wait - place memory barrier behind the poll_wait call.
2083 * @sock: socket to wait on
2086 * See the comments in the wq_has_sleeper function.
2088 static inline void sock_poll_wait(struct file
*filp
, struct socket
*sock
,
2091 if (!poll_does_not_wait(p
)) {
2092 poll_wait(filp
, &sock
->wq
->wait
, p
);
2093 /* We need to be sure we are in sync with the
2094 * socket flags modification.
2096 * This memory barrier is paired in the wq_has_sleeper.
2102 static inline void skb_set_hash_from_sk(struct sk_buff
*skb
, struct sock
*sk
)
2104 if (sk
->sk_txhash
) {
2106 skb
->hash
= sk
->sk_txhash
;
2110 void skb_set_owner_w(struct sk_buff
*skb
, struct sock
*sk
);
2113 * Queue a received datagram if it will fit. Stream and sequenced
2114 * protocols can't normally use this as they need to fit buffers in
2115 * and play with them.
2117 * Inlined as it's very short and called for pretty much every
2118 * packet ever received.
2120 static inline void skb_set_owner_r(struct sk_buff
*skb
, struct sock
*sk
)
2124 skb
->destructor
= sock_rfree
;
2125 atomic_add(skb
->truesize
, &sk
->sk_rmem_alloc
);
2126 sk_mem_charge(sk
, skb
->truesize
);
2129 void sk_reset_timer(struct sock
*sk
, struct timer_list
*timer
,
2130 unsigned long expires
);
2132 void sk_stop_timer(struct sock
*sk
, struct timer_list
*timer
);
2134 int __sk_queue_drop_skb(struct sock
*sk
, struct sk_buff_head
*sk_queue
,
2135 struct sk_buff
*skb
, unsigned int flags
,
2136 void (*destructor
)(struct sock
*sk
,
2137 struct sk_buff
*skb
));
2138 int __sock_queue_rcv_skb(struct sock
*sk
, struct sk_buff
*skb
);
2139 int sock_queue_rcv_skb(struct sock
*sk
, struct sk_buff
*skb
);
2141 int sock_queue_err_skb(struct sock
*sk
, struct sk_buff
*skb
);
2142 struct sk_buff
*sock_dequeue_err_skb(struct sock
*sk
);
2145 * Recover an error report and clear atomically
2148 static inline int sock_error(struct sock
*sk
)
2151 if (likely(!sk
->sk_err
))
2153 err
= xchg(&sk
->sk_err
, 0);
2157 static inline unsigned long sock_wspace(struct sock
*sk
)
2161 if (!(sk
->sk_shutdown
& SEND_SHUTDOWN
)) {
2162 amt
= sk
->sk_sndbuf
- refcount_read(&sk
->sk_wmem_alloc
);
2170 * We use sk->sk_wq_raw, from contexts knowing this
2171 * pointer is not NULL and cannot disappear/change.
2173 static inline void sk_set_bit(int nr
, struct sock
*sk
)
2175 if ((nr
== SOCKWQ_ASYNC_NOSPACE
|| nr
== SOCKWQ_ASYNC_WAITDATA
) &&
2176 !sock_flag(sk
, SOCK_FASYNC
))
2179 set_bit(nr
, &sk
->sk_wq_raw
->flags
);
2182 static inline void sk_clear_bit(int nr
, struct sock
*sk
)
2184 if ((nr
== SOCKWQ_ASYNC_NOSPACE
|| nr
== SOCKWQ_ASYNC_WAITDATA
) &&
2185 !sock_flag(sk
, SOCK_FASYNC
))
2188 clear_bit(nr
, &sk
->sk_wq_raw
->flags
);
2191 static inline void sk_wake_async(const struct sock
*sk
, int how
, int band
)
2193 if (sock_flag(sk
, SOCK_FASYNC
)) {
2195 sock_wake_async(rcu_dereference(sk
->sk_wq
), how
, band
);
2200 /* Since sk_{r,w}mem_alloc sums skb->truesize, even a small frame might
2201 * need sizeof(sk_buff) + MTU + padding, unless net driver perform copybreak.
2202 * Note: for send buffers, TCP works better if we can build two skbs at
2205 #define TCP_SKB_MIN_TRUESIZE (2048 + SKB_DATA_ALIGN(sizeof(struct sk_buff)))
2207 #define SOCK_MIN_SNDBUF (TCP_SKB_MIN_TRUESIZE * 2)
2208 #define SOCK_MIN_RCVBUF TCP_SKB_MIN_TRUESIZE
2210 static inline void sk_stream_moderate_sndbuf(struct sock
*sk
)
2212 if (!(sk
->sk_userlocks
& SOCK_SNDBUF_LOCK
)) {
2213 sk
->sk_sndbuf
= min(sk
->sk_sndbuf
, sk
->sk_wmem_queued
>> 1);
2214 sk
->sk_sndbuf
= max_t(u32
, sk
->sk_sndbuf
, SOCK_MIN_SNDBUF
);
2218 struct sk_buff
*sk_stream_alloc_skb(struct sock
*sk
, int size
, gfp_t gfp
,
2219 bool force_schedule
);
2222 * sk_page_frag - return an appropriate page_frag
2225 * If socket allocation mode allows current thread to sleep, it means its
2226 * safe to use the per task page_frag instead of the per socket one.
2228 static inline struct page_frag
*sk_page_frag(struct sock
*sk
)
2230 if (gfpflags_allow_blocking(sk
->sk_allocation
))
2231 return ¤t
->task_frag
;
2233 return &sk
->sk_frag
;
2236 bool sk_page_frag_refill(struct sock
*sk
, struct page_frag
*pfrag
);
2239 * Default write policy as shown to user space via poll/select/SIGIO
2241 static inline bool sock_writeable(const struct sock
*sk
)
2243 return refcount_read(&sk
->sk_wmem_alloc
) < (sk
->sk_sndbuf
>> 1);
2246 static inline gfp_t
gfp_any(void)
2248 return in_softirq() ? GFP_ATOMIC
: GFP_KERNEL
;
2251 static inline long sock_rcvtimeo(const struct sock
*sk
, bool noblock
)
2253 return noblock
? 0 : sk
->sk_rcvtimeo
;
2256 static inline long sock_sndtimeo(const struct sock
*sk
, bool noblock
)
2258 return noblock
? 0 : sk
->sk_sndtimeo
;
2261 static inline int sock_rcvlowat(const struct sock
*sk
, int waitall
, int len
)
2263 return (waitall
? len
: min_t(int, sk
->sk_rcvlowat
, len
)) ? : 1;
2266 /* Alas, with timeout socket operations are not restartable.
2267 * Compare this to poll().
2269 static inline int sock_intr_errno(long timeo
)
2271 return timeo
== MAX_SCHEDULE_TIMEOUT
? -ERESTARTSYS
: -EINTR
;
2274 struct sock_skb_cb
{
2278 /* Store sock_skb_cb at the end of skb->cb[] so protocol families
2279 * using skb->cb[] would keep using it directly and utilize its
2280 * alignement guarantee.
2282 #define SOCK_SKB_CB_OFFSET ((FIELD_SIZEOF(struct sk_buff, cb) - \
2283 sizeof(struct sock_skb_cb)))
2285 #define SOCK_SKB_CB(__skb) ((struct sock_skb_cb *)((__skb)->cb + \
2286 SOCK_SKB_CB_OFFSET))
2288 #define sock_skb_cb_check_size(size) \
2289 BUILD_BUG_ON((size) > SOCK_SKB_CB_OFFSET)
2292 sock_skb_set_dropcount(const struct sock
*sk
, struct sk_buff
*skb
)
2294 SOCK_SKB_CB(skb
)->dropcount
= sock_flag(sk
, SOCK_RXQ_OVFL
) ?
2295 atomic_read(&sk
->sk_drops
) : 0;
2298 static inline void sk_drops_add(struct sock
*sk
, const struct sk_buff
*skb
)
2300 int segs
= max_t(u16
, 1, skb_shinfo(skb
)->gso_segs
);
2302 atomic_add(segs
, &sk
->sk_drops
);
2305 static inline ktime_t
sock_read_timestamp(struct sock
*sk
)
2307 #if BITS_PER_LONG==32
2312 seq
= read_seqbegin(&sk
->sk_stamp_seq
);
2314 } while (read_seqretry(&sk
->sk_stamp_seq
, seq
));
2318 return sk
->sk_stamp
;
2322 static inline void sock_write_timestamp(struct sock
*sk
, ktime_t kt
)
2324 #if BITS_PER_LONG==32
2325 write_seqlock(&sk
->sk_stamp_seq
);
2327 write_sequnlock(&sk
->sk_stamp_seq
);
2333 void __sock_recv_timestamp(struct msghdr
*msg
, struct sock
*sk
,
2334 struct sk_buff
*skb
);
2335 void __sock_recv_wifi_status(struct msghdr
*msg
, struct sock
*sk
,
2336 struct sk_buff
*skb
);
2339 sock_recv_timestamp(struct msghdr
*msg
, struct sock
*sk
, struct sk_buff
*skb
)
2341 ktime_t kt
= skb
->tstamp
;
2342 struct skb_shared_hwtstamps
*hwtstamps
= skb_hwtstamps(skb
);
2345 * generate control messages if
2346 * - receive time stamping in software requested
2347 * - software time stamp available and wanted
2348 * - hardware time stamps available and wanted
2350 if (sock_flag(sk
, SOCK_RCVTSTAMP
) ||
2351 (sk
->sk_tsflags
& SOF_TIMESTAMPING_RX_SOFTWARE
) ||
2352 (kt
&& sk
->sk_tsflags
& SOF_TIMESTAMPING_SOFTWARE
) ||
2353 (hwtstamps
->hwtstamp
&&
2354 (sk
->sk_tsflags
& SOF_TIMESTAMPING_RAW_HARDWARE
)))
2355 __sock_recv_timestamp(msg
, sk
, skb
);
2357 sock_write_timestamp(sk
, kt
);
2359 if (sock_flag(sk
, SOCK_WIFI_STATUS
) && skb
->wifi_acked_valid
)
2360 __sock_recv_wifi_status(msg
, sk
, skb
);
2363 void __sock_recv_ts_and_drops(struct msghdr
*msg
, struct sock
*sk
,
2364 struct sk_buff
*skb
);
2366 #define SK_DEFAULT_STAMP (-1L * NSEC_PER_SEC)
2367 static inline void sock_recv_ts_and_drops(struct msghdr
*msg
, struct sock
*sk
,
2368 struct sk_buff
*skb
)
2370 #define FLAGS_TS_OR_DROPS ((1UL << SOCK_RXQ_OVFL) | \
2371 (1UL << SOCK_RCVTSTAMP))
2372 #define TSFLAGS_ANY (SOF_TIMESTAMPING_SOFTWARE | \
2373 SOF_TIMESTAMPING_RAW_HARDWARE)
2375 if (sk
->sk_flags
& FLAGS_TS_OR_DROPS
|| sk
->sk_tsflags
& TSFLAGS_ANY
)
2376 __sock_recv_ts_and_drops(msg
, sk
, skb
);
2377 else if (unlikely(sock_flag(sk
, SOCK_TIMESTAMP
)))
2378 sock_write_timestamp(sk
, skb
->tstamp
);
2379 else if (unlikely(sk
->sk_stamp
== SK_DEFAULT_STAMP
))
2380 sock_write_timestamp(sk
, 0);
2383 void __sock_tx_timestamp(__u16 tsflags
, __u8
*tx_flags
);
2386 * _sock_tx_timestamp - checks whether the outgoing packet is to be time stamped
2387 * @sk: socket sending this packet
2388 * @tsflags: timestamping flags to use
2389 * @tx_flags: completed with instructions for time stamping
2390 * @tskey: filled in with next sk_tskey (not for TCP, which uses seqno)
2392 * Note: callers should take care of initial ``*tx_flags`` value (usually 0)
2394 static inline void _sock_tx_timestamp(struct sock
*sk
, __u16 tsflags
,
2395 __u8
*tx_flags
, __u32
*tskey
)
2397 if (unlikely(tsflags
)) {
2398 __sock_tx_timestamp(tsflags
, tx_flags
);
2399 if (tsflags
& SOF_TIMESTAMPING_OPT_ID
&& tskey
&&
2400 tsflags
& SOF_TIMESTAMPING_TX_RECORD_MASK
)
2401 *tskey
= sk
->sk_tskey
++;
2403 if (unlikely(sock_flag(sk
, SOCK_WIFI_STATUS
)))
2404 *tx_flags
|= SKBTX_WIFI_STATUS
;
2407 static inline void sock_tx_timestamp(struct sock
*sk
, __u16 tsflags
,
2410 _sock_tx_timestamp(sk
, tsflags
, tx_flags
, NULL
);
2413 static inline void skb_setup_tx_timestamp(struct sk_buff
*skb
, __u16 tsflags
)
2415 _sock_tx_timestamp(skb
->sk
, tsflags
, &skb_shinfo(skb
)->tx_flags
,
2416 &skb_shinfo(skb
)->tskey
);
2420 * sk_eat_skb - Release a skb if it is no longer needed
2421 * @sk: socket to eat this skb from
2422 * @skb: socket buffer to eat
2424 * This routine must be called with interrupts disabled or with the socket
2425 * locked so that the sk_buff queue operation is ok.
2427 static inline void sk_eat_skb(struct sock
*sk
, struct sk_buff
*skb
)
2429 __skb_unlink(skb
, &sk
->sk_receive_queue
);
2434 struct net
*sock_net(const struct sock
*sk
)
2436 return read_pnet(&sk
->sk_net
);
2440 void sock_net_set(struct sock
*sk
, struct net
*net
)
2442 write_pnet(&sk
->sk_net
, net
);
2445 static inline struct sock
*skb_steal_sock(struct sk_buff
*skb
)
2448 struct sock
*sk
= skb
->sk
;
2450 skb
->destructor
= NULL
;
2457 /* This helper checks if a socket is a full socket,
2458 * ie _not_ a timewait or request socket.
2460 static inline bool sk_fullsock(const struct sock
*sk
)
2462 return (1 << sk
->sk_state
) & ~(TCPF_TIME_WAIT
| TCPF_NEW_SYN_RECV
);
2465 /* Checks if this SKB belongs to an HW offloaded socket
2466 * and whether any SW fallbacks are required based on dev.
2468 static inline struct sk_buff
*sk_validate_xmit_skb(struct sk_buff
*skb
,
2469 struct net_device
*dev
)
2471 #ifdef CONFIG_SOCK_VALIDATE_XMIT
2472 struct sock
*sk
= skb
->sk
;
2474 if (sk
&& sk_fullsock(sk
) && sk
->sk_validate_xmit_skb
)
2475 skb
= sk
->sk_validate_xmit_skb(sk
, dev
, skb
);
2481 /* This helper checks if a socket is a LISTEN or NEW_SYN_RECV
2482 * SYNACK messages can be attached to either ones (depending on SYNCOOKIE)
2484 static inline bool sk_listener(const struct sock
*sk
)
2486 return (1 << sk
->sk_state
) & (TCPF_LISTEN
| TCPF_NEW_SYN_RECV
);
2489 void sock_enable_timestamp(struct sock
*sk
, int flag
);
2490 int sock_get_timestamp(struct sock
*, struct timeval __user
*);
2491 int sock_get_timestampns(struct sock
*, struct timespec __user
*);
2492 int sock_recv_errqueue(struct sock
*sk
, struct msghdr
*msg
, int len
, int level
,
2495 bool sk_ns_capable(const struct sock
*sk
,
2496 struct user_namespace
*user_ns
, int cap
);
2497 bool sk_capable(const struct sock
*sk
, int cap
);
2498 bool sk_net_capable(const struct sock
*sk
, int cap
);
2500 void sk_get_meminfo(const struct sock
*sk
, u32
*meminfo
);
2502 /* Take into consideration the size of the struct sk_buff overhead in the
2503 * determination of these values, since that is non-constant across
2504 * platforms. This makes socket queueing behavior and performance
2505 * not depend upon such differences.
2507 #define _SK_MEM_PACKETS 256
2508 #define _SK_MEM_OVERHEAD SKB_TRUESIZE(256)
2509 #define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
2510 #define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
2512 extern __u32 sysctl_wmem_max
;
2513 extern __u32 sysctl_rmem_max
;
2515 extern int sysctl_tstamp_allow_data
;
2516 extern int sysctl_optmem_max
;
2518 extern __u32 sysctl_wmem_default
;
2519 extern __u32 sysctl_rmem_default
;
2521 static inline int sk_get_wmem0(const struct sock
*sk
, const struct proto
*proto
)
2523 /* Does this proto have per netns sysctl_wmem ? */
2524 if (proto
->sysctl_wmem_offset
)
2525 return *(int *)((void *)sock_net(sk
) + proto
->sysctl_wmem_offset
);
2527 return *proto
->sysctl_wmem
;
2530 static inline int sk_get_rmem0(const struct sock
*sk
, const struct proto
*proto
)
2532 /* Does this proto have per netns sysctl_rmem ? */
2533 if (proto
->sysctl_rmem_offset
)
2534 return *(int *)((void *)sock_net(sk
) + proto
->sysctl_rmem_offset
);
2536 return *proto
->sysctl_rmem
;
2539 /* Default TCP Small queue budget is ~1 ms of data (1sec >> 10)
2540 * Some wifi drivers need to tweak it to get more chunks.
2541 * They can use this helper from their ndo_start_xmit()
2543 static inline void sk_pacing_shift_update(struct sock
*sk
, int val
)
2545 if (!sk
|| !sk_fullsock(sk
) || sk
->sk_pacing_shift
== val
)
2547 sk
->sk_pacing_shift
= val
;
2550 /* if a socket is bound to a device, check that the given device
2551 * index is either the same or that the socket is bound to an L3
2552 * master device and the given device index is also enslaved to
2555 static inline bool sk_dev_equal_l3scope(struct sock
*sk
, int dif
)
2559 if (!sk
->sk_bound_dev_if
|| sk
->sk_bound_dev_if
== dif
)
2562 mdif
= l3mdev_master_ifindex_by_index(sock_net(sk
), dif
);
2563 if (mdif
&& mdif
== sk
->sk_bound_dev_if
)
2569 #endif /* _SOCK_H */