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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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.
5 *
6 * Definitions for the AF_INET socket handler.
7 *
8 * Version: @(#)sock.h 1.0.4 05/13/93
9 *
Jesper Juhl02c30a82005-05-05 16:16:16 -070010 * Authors: Ross Biro
Linus Torvalds1da177e2005-04-16 15:20:36 -070011 * 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>
14 *
15 * Fixes:
16 * Alan Cox : Volatiles in skbuff pointers. See
17 * skbuff comments. May be overdone,
18 * better to prove they can be removed
19 * than the reverse.
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
33 *
34 *
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.
39 */
40#ifndef _SOCK_H
41#define _SOCK_H
42
Alexey Dobriyana6b7a402011-06-06 10:43:46 +000043#include <linux/hardirq.h>
Ilpo Järvinen172589c2007-08-28 15:50:33 -070044#include <linux/kernel.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070045#include <linux/list.h>
Eric Dumazet88ab1932008-11-16 19:39:21 -080046#include <linux/list_nulls.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070047#include <linux/timer.h>
48#include <linux/cache.h>
Glauber Costa3f134612012-05-29 15:07:11 -070049#include <linux/bitops.h>
Ingo Molnara5b5bb92006-07-03 00:25:35 -070050#include <linux/lockdep.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070051#include <linux/netdevice.h>
52#include <linux/skbuff.h> /* struct sk_buff */
Al Virod7fe0f22006-12-03 23:15:30 -050053#include <linux/mm.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070054#include <linux/security.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090055#include <linux/slab.h>
Tom Herbertc6e1a0d2011-04-04 22:30:30 -070056#include <linux/uaccess.h>
Glauber Costa180d8cd2011-12-11 21:47:02 +000057#include <linux/memcontrol.h>
Glauber Costae1aab162011-12-11 21:47:03 +000058#include <linux/res_counter.h>
Ingo Molnarc5905af2012-02-24 08:31:31 +010059#include <linux/static_key.h>
Al Viro40401532012-02-13 03:58:52 +000060#include <linux/aio.h>
61#include <linux/sched.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070062
63#include <linux/filter.h>
Eric Dumazet88ab1932008-11-16 19:39:21 -080064#include <linux/rculist_nulls.h>
Jiri Olsaa57de0b2009-07-08 12:09:13 +000065#include <linux/poll.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070066
Eric Dumazetc31504d2010-11-15 19:58:26 +000067#include <linux/atomic.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070068#include <net/dst.h>
69#include <net/checksum.h>
70
Eric Dumazet9f048bf2011-12-13 03:59:08 +000071struct cgroup;
72struct cgroup_subsys;
Glauber Costac607b2e2011-12-16 00:52:00 +000073#ifdef CONFIG_NET
Glauber Costa1d62e432012-04-09 19:36:33 -030074int mem_cgroup_sockets_init(struct mem_cgroup *memcg, struct cgroup_subsys *ss);
75void mem_cgroup_sockets_destroy(struct mem_cgroup *memcg);
Glauber Costac607b2e2011-12-16 00:52:00 +000076#else
77static inline
Glauber Costa1d62e432012-04-09 19:36:33 -030078int mem_cgroup_sockets_init(struct mem_cgroup *memcg, struct cgroup_subsys *ss)
Glauber Costac607b2e2011-12-16 00:52:00 +000079{
80 return 0;
81}
82static inline
Glauber Costa1d62e432012-04-09 19:36:33 -030083void mem_cgroup_sockets_destroy(struct mem_cgroup *memcg)
Glauber Costac607b2e2011-12-16 00:52:00 +000084{
85}
86#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -070087/*
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.
91 */
92
93/* Define this to get the SOCK_DBG debugging facility. */
94#define SOCK_DEBUGGING
95#ifdef SOCK_DEBUGGING
96#define SOCK_DEBUG(sk, msg...) do { if ((sk) && sock_flag((sk), SOCK_DBG)) \
97 printk(KERN_DEBUG msg); } while (0)
98#else
Stephen Hemminger4cd90292008-03-21 15:54:53 -070099/* Validate arguments and do nothing */
Joe Perchesb9075fa2011-10-31 17:11:33 -0700100static inline __printf(2, 3)
Eric Dumazetdc6b9b72012-05-16 22:48:15 +0000101void SOCK_DEBUG(const struct sock *sk, const char *msg, ...)
Stephen Hemminger4cd90292008-03-21 15:54:53 -0700102{
103}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104#endif
105
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.
109 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110typedef struct {
111 spinlock_t slock;
John Heffnerd2e91172007-09-12 10:44:19 +0200112 int owned;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113 wait_queue_head_t wq;
Ingo Molnara5b5bb92006-07-03 00:25:35 -0700114 /*
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
118 * the slock itself):
119 */
120#ifdef CONFIG_DEBUG_LOCK_ALLOC
121 struct lockdep_map dep_map;
122#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123} socket_lock_t;
124
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125struct sock;
Arnaldo Carvalho de Melo8feaf0c02005-08-09 20:09:30 -0700126struct proto;
Denis V. Lunev0eeb8ff2007-12-04 01:15:45 -0800127struct net;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128
129/**
Pavel Pisa4dc3b162005-05-01 08:59:25 -0700130 * struct sock_common - minimal network layer representation of sockets
Eric Dumazet68835ab2010-11-30 19:04:07 +0000131 * @skc_daddr: Foreign IPv4 addr
132 * @skc_rcv_saddr: Bound local IPv4 addr
Eric Dumazet4dc6dc72009-07-15 23:13:10 +0000133 * @skc_hash: hash value used with various protocol lookup tables
Eric Dumazetd4cada42009-11-08 10:17:30 +0000134 * @skc_u16hashes: two u16 hash values used by UDP lookup tables
Pavel Pisa4dc3b162005-05-01 08:59:25 -0700135 * @skc_family: network address family
136 * @skc_state: Connection state
137 * @skc_reuse: %SO_REUSEADDR setting
138 * @skc_bound_dev_if: bound device index if != 0
Pavel Pisa4dc3b162005-05-01 08:59:25 -0700139 * @skc_bind_node: bind hash linkage for various protocol lookup tables
Eric Dumazet512615b2009-11-08 10:17:58 +0000140 * @skc_portaddr_node: second hash linkage for UDP/UDP-Lite protocol
Arnaldo Carvalho de Melo8feaf0c02005-08-09 20:09:30 -0700141 * @skc_prot: protocol handlers inside a network family
Eric W. Biederman07feaeb2007-09-12 11:58:02 +0200142 * @skc_net: reference to the network namespace of this socket
Eric Dumazet68835ab2010-11-30 19:04:07 +0000143 * @skc_node: main hash linkage for various protocol lookup tables
144 * @skc_nulls_node: main hash linkage for TCP/UDP/UDP-Lite protocol
145 * @skc_tx_queue_mapping: tx queue number for this connection
146 * @skc_refcnt: reference count
Pavel Pisa4dc3b162005-05-01 08:59:25 -0700147 *
148 * This is the minimal network layer representation of sockets, the header
Arnaldo Carvalho de Melo8feaf0c02005-08-09 20:09:30 -0700149 * for struct sock and struct inet_timewait_sock.
150 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151struct sock_common {
Eric Dumazet68835ab2010-11-30 19:04:07 +0000152 /* skc_daddr and skc_rcv_saddr must be grouped :
153 * cf INET_MATCH() and INET_TW_MATCH()
Eric Dumazet4dc6dc72009-07-15 23:13:10 +0000154 */
Eric Dumazet68835ab2010-11-30 19:04:07 +0000155 __be32 skc_daddr;
156 __be32 skc_rcv_saddr;
Eric Dumazet4dc6dc72009-07-15 23:13:10 +0000157
Eric Dumazetd4cada42009-11-08 10:17:30 +0000158 union {
159 unsigned int skc_hash;
160 __u16 skc_u16hashes[2];
161 };
Eric Dumazet4dc6dc72009-07-15 23:13:10 +0000162 unsigned short skc_family;
163 volatile unsigned char skc_state;
164 unsigned char skc_reuse;
165 int skc_bound_dev_if;
Eric Dumazet512615b2009-11-08 10:17:58 +0000166 union {
167 struct hlist_node skc_bind_node;
168 struct hlist_nulls_node skc_portaddr_node;
169 };
Arnaldo Carvalho de Melo8feaf0c02005-08-09 20:09:30 -0700170 struct proto *skc_prot;
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +0900171#ifdef CONFIG_NET_NS
Eric W. Biederman07feaeb2007-09-12 11:58:02 +0200172 struct net *skc_net;
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +0900173#endif
Eric Dumazet68835ab2010-11-30 19:04:07 +0000174 /*
175 * fields between dontcopy_begin/dontcopy_end
176 * are not copied in sock_copy()
177 */
Randy Dunlap928c41e2011-01-08 17:39:21 +0000178 /* private: */
Eric Dumazet68835ab2010-11-30 19:04:07 +0000179 int skc_dontcopy_begin[0];
Randy Dunlap928c41e2011-01-08 17:39:21 +0000180 /* public: */
Eric Dumazet68835ab2010-11-30 19:04:07 +0000181 union {
182 struct hlist_node skc_node;
183 struct hlist_nulls_node skc_nulls_node;
184 };
185 int skc_tx_queue_mapping;
186 atomic_t skc_refcnt;
Randy Dunlap928c41e2011-01-08 17:39:21 +0000187 /* private: */
Eric Dumazet68835ab2010-11-30 19:04:07 +0000188 int skc_dontcopy_end[0];
Randy Dunlap928c41e2011-01-08 17:39:21 +0000189 /* public: */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190};
191
Glauber Costae1aab162011-12-11 21:47:03 +0000192struct cg_proto;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193/**
194 * struct sock - network layer representation of sockets
Arnaldo Carvalho de Melo8feaf0c02005-08-09 20:09:30 -0700195 * @__sk_common: shared layout with inet_timewait_sock
Pavel Pisa4dc3b162005-05-01 08:59:25 -0700196 * @sk_shutdown: mask of %SEND_SHUTDOWN and/or %RCV_SHUTDOWN
197 * @sk_userlocks: %SO_SNDBUF and %SO_RCVBUF settings
198 * @sk_lock: synchronizer
199 * @sk_rcvbuf: size of receive buffer in bytes
Eric Dumazet43815482010-04-29 11:01:49 +0000200 * @sk_wq: sock wait queue and async head
Eric Dumazetdeaa5852012-06-24 20:22:49 +0000201 * @sk_rx_dst: receive input route used by early tcp demux
Pavel Pisa4dc3b162005-05-01 08:59:25 -0700202 * @sk_dst_cache: destination cache
203 * @sk_dst_lock: destination cache lock
204 * @sk_policy: flow policy
Pavel Pisa4dc3b162005-05-01 08:59:25 -0700205 * @sk_receive_queue: incoming packets
206 * @sk_wmem_alloc: transmit queue bytes committed
207 * @sk_write_queue: Packet sending queue
Chris Leech97fc2f02006-05-23 17:55:33 -0700208 * @sk_async_wait_queue: DMA copied packets
Pavel Pisa4dc3b162005-05-01 08:59:25 -0700209 * @sk_omem_alloc: "o" is "option" or "other"
210 * @sk_wmem_queued: persistent queue size
211 * @sk_forward_alloc: space allocated forward
212 * @sk_allocation: allocation mode
213 * @sk_sndbuf: size of send buffer in bytes
Wang Chen33c732c2007-11-13 20:30:01 -0800214 * @sk_flags: %SO_LINGER (l_onoff), %SO_BROADCAST, %SO_KEEPALIVE,
Patrick Ohly20d49472009-02-12 05:03:38 +0000215 * %SO_OOBINLINE settings, %SO_TIMESTAMPING settings
Pavel Pisa4dc3b162005-05-01 08:59:25 -0700216 * @sk_no_check: %SO_NO_CHECK setting, wether or not checkup packets
217 * @sk_route_caps: route capabilities (e.g. %NETIF_F_TSO)
Eric Dumazeta4654192010-05-16 00:36:33 -0700218 * @sk_route_nocaps: forbidden route capabilities (e.g NETIF_F_GSO_MASK)
Herbert Xubcd76112006-06-30 13:36:35 -0700219 * @sk_gso_type: GSO type (e.g. %SKB_GSO_TCPV4)
Peter P Waskiewicz Jr82cc1a72008-03-21 03:43:19 -0700220 * @sk_gso_max_size: Maximum GSO segment size to build
Ben Hutchings14853482012-07-30 16:11:42 +0000221 * @sk_gso_max_segs: Maximum number of GSO segments
Pavel Pisa4dc3b162005-05-01 08:59:25 -0700222 * @sk_lingertime: %SO_LINGER l_linger setting
Pavel Pisa4dc3b162005-05-01 08:59:25 -0700223 * @sk_backlog: always used with the per-socket spinlock held
224 * @sk_callback_lock: used with the callbacks in the end of this struct
225 * @sk_error_queue: rarely used
Wang Chen33c732c2007-11-13 20:30:01 -0800226 * @sk_prot_creator: sk_prot of original sock creator (see ipv6_setsockopt,
227 * IPV6_ADDRFORM for instance)
Pavel Pisa4dc3b162005-05-01 08:59:25 -0700228 * @sk_err: last error
Wang Chen33c732c2007-11-13 20:30:01 -0800229 * @sk_err_soft: errors that don't cause failure but are the cause of a
230 * persistent failure not just 'timed out'
Eric Dumazetcb61cb92008-06-17 21:04:56 -0700231 * @sk_drops: raw/udp drops counter
Pavel Pisa4dc3b162005-05-01 08:59:25 -0700232 * @sk_ack_backlog: current listen backlog
233 * @sk_max_ack_backlog: listen backlog set in listen()
234 * @sk_priority: %SO_PRIORITY setting
Randy Dunlap1a3bc362012-01-21 09:03:10 +0000235 * @sk_cgrp_prioidx: socket group's priority map index
Pavel Pisa4dc3b162005-05-01 08:59:25 -0700236 * @sk_type: socket type (%SOCK_STREAM, etc)
237 * @sk_protocol: which protocol this socket belongs in this network family
Randy Dunlap53c3fa22010-08-09 13:41:07 +0000238 * @sk_peer_pid: &struct pid for this socket's peer
239 * @sk_peer_cred: %SO_PEERCRED setting
Pavel Pisa4dc3b162005-05-01 08:59:25 -0700240 * @sk_rcvlowat: %SO_RCVLOWAT setting
241 * @sk_rcvtimeo: %SO_RCVTIMEO setting
242 * @sk_sndtimeo: %SO_SNDTIMEO setting
David S. Millerc58dc012010-04-27 15:05:31 -0700243 * @sk_rxhash: flow hash received from netif layer
Pavel Pisa4dc3b162005-05-01 08:59:25 -0700244 * @sk_filter: socket filtering instructions
245 * @sk_protinfo: private area, net family specific, when not using slab
246 * @sk_timer: sock cleanup timer
247 * @sk_stamp: time stamp of last packet received
248 * @sk_socket: Identd and reporting IO signals
249 * @sk_user_data: RPC layer private data
250 * @sk_sndmsg_page: cached page for sendmsg
251 * @sk_sndmsg_off: cached offset for sendmsg
Randy Dunlapd3d4f0a2012-04-17 14:03:53 +0000252 * @sk_peek_off: current peek_offset value
Pavel Pisa4dc3b162005-05-01 08:59:25 -0700253 * @sk_send_head: front of stuff to transmit
Martin Waitz67be2dd2005-05-01 08:59:26 -0700254 * @sk_security: used by security modules
Randy Dunlap31729362008-02-18 20:52:13 -0800255 * @sk_mark: generic packet mark
Randy Dunlap53c3fa22010-08-09 13:41:07 +0000256 * @sk_classid: this socket's cgroup classid
Glauber Costae1aab162011-12-11 21:47:03 +0000257 * @sk_cgrp: this socket's cgroup-specific proto data
Pavel Pisa4dc3b162005-05-01 08:59:25 -0700258 * @sk_write_pending: a write to stream socket waits to start
259 * @sk_state_change: callback to indicate change in the state of the sock
260 * @sk_data_ready: callback to indicate there is data to be processed
261 * @sk_write_space: callback to indicate there is bf sending space available
262 * @sk_error_report: callback to indicate errors (e.g. %MSG_ERRQUEUE)
263 * @sk_backlog_rcv: callback to process the backlog
264 * @sk_destruct: called at sock freeing time, i.e. when all refcnt == 0
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265 */
266struct sock {
267 /*
Arnaldo Carvalho de Melo8feaf0c02005-08-09 20:09:30 -0700268 * Now struct inet_timewait_sock also uses sock_common, so please just
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269 * don't add nothing before this first member (__sk_common) --acme
270 */
271 struct sock_common __sk_common;
Eric Dumazet4dc6dc72009-07-15 23:13:10 +0000272#define sk_node __sk_common.skc_node
273#define sk_nulls_node __sk_common.skc_nulls_node
274#define sk_refcnt __sk_common.skc_refcnt
Krishna Kumare022f0b2009-10-19 23:46:20 +0000275#define sk_tx_queue_mapping __sk_common.skc_tx_queue_mapping
Eric Dumazet4dc6dc72009-07-15 23:13:10 +0000276
Eric Dumazet68835ab2010-11-30 19:04:07 +0000277#define sk_dontcopy_begin __sk_common.skc_dontcopy_begin
278#define sk_dontcopy_end __sk_common.skc_dontcopy_end
Eric Dumazet4dc6dc72009-07-15 23:13:10 +0000279#define sk_hash __sk_common.skc_hash
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280#define sk_family __sk_common.skc_family
281#define sk_state __sk_common.skc_state
282#define sk_reuse __sk_common.skc_reuse
283#define sk_bound_dev_if __sk_common.skc_bound_dev_if
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284#define sk_bind_node __sk_common.skc_bind_node
Arnaldo Carvalho de Melo8feaf0c02005-08-09 20:09:30 -0700285#define sk_prot __sk_common.skc_prot
Eric W. Biederman07feaeb2007-09-12 11:58:02 +0200286#define sk_net __sk_common.skc_net
Eric Dumazetb178bb32010-11-16 05:56:04 +0000287 socket_lock_t sk_lock;
288 struct sk_buff_head sk_receive_queue;
289 /*
290 * The backlog queue is special, it is always used with
291 * the per-socket spinlock held and requires low latency
292 * access. Therefore we special case it's implementation.
293 * Note : rmem_alloc is in this structure to fill a hole
294 * on 64bit arches, not because its logically part of
295 * backlog.
296 */
297 struct {
298 atomic_t rmem_alloc;
299 int len;
300 struct sk_buff *head;
301 struct sk_buff *tail;
302 } sk_backlog;
303#define sk_rmem_alloc sk_backlog.rmem_alloc
304 int sk_forward_alloc;
305#ifdef CONFIG_RPS
306 __u32 sk_rxhash;
307#endif
308 atomic_t sk_drops;
309 int sk_rcvbuf;
310
311 struct sk_filter __rcu *sk_filter;
Eric Dumazeteaefd112011-02-18 03:26:36 +0000312 struct socket_wq __rcu *sk_wq;
Eric Dumazetb178bb32010-11-16 05:56:04 +0000313
314#ifdef CONFIG_NET_DMA
315 struct sk_buff_head sk_async_wait_queue;
316#endif
317
318#ifdef CONFIG_XFRM
319 struct xfrm_policy *sk_policy[2];
320#endif
321 unsigned long sk_flags;
Eric Dumazetdeaa5852012-06-24 20:22:49 +0000322 struct dst_entry *sk_rx_dst;
Eric Dumazetb178bb32010-11-16 05:56:04 +0000323 struct dst_entry *sk_dst_cache;
324 spinlock_t sk_dst_lock;
325 atomic_t sk_wmem_alloc;
326 atomic_t sk_omem_alloc;
327 int sk_sndbuf;
328 struct sk_buff_head sk_write_queue;
Vegard Nossuma98b65a2009-02-26 14:46:57 +0100329 kmemcheck_bitfield_begin(flags);
Eric Dumazet5fdb9972009-10-08 22:50:25 +0000330 unsigned int sk_shutdown : 2,
331 sk_no_check : 2,
332 sk_userlocks : 4,
333 sk_protocol : 8,
334 sk_type : 16;
Vegard Nossuma98b65a2009-02-26 14:46:57 +0100335 kmemcheck_bitfield_end(flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700336 int sk_wmem_queued;
Al Viro7d877f32005-10-21 03:20:43 -0400337 gfp_t sk_allocation;
Michał Mirosławc8f44af2011-11-15 15:29:55 +0000338 netdev_features_t sk_route_caps;
339 netdev_features_t sk_route_nocaps;
Herbert Xubcd76112006-06-30 13:36:35 -0700340 int sk_gso_type;
Peter P Waskiewicz Jr82cc1a72008-03-21 03:43:19 -0700341 unsigned int sk_gso_max_size;
Ben Hutchings14853482012-07-30 16:11:42 +0000342 u16 sk_gso_max_segs;
David S. Miller9932cf92006-03-24 15:12:37 -0800343 int sk_rcvlowat;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344 unsigned long sk_lingertime;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345 struct sk_buff_head sk_error_queue;
Arnaldo Carvalho de Melo476e19c2005-05-05 13:35:15 -0700346 struct proto *sk_prot_creator;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347 rwlock_t sk_callback_lock;
348 int sk_err,
349 sk_err_soft;
350 unsigned short sk_ack_backlog;
351 unsigned short sk_max_ack_backlog;
352 __u32 sk_priority;
Neil Horman5bc14212011-11-22 05:10:51 +0000353#ifdef CONFIG_CGROUPS
354 __u32 sk_cgrp_prioidx;
355#endif
Eric W. Biederman109f6e32010-06-13 03:30:14 +0000356 struct pid *sk_peer_pid;
357 const struct cred *sk_peer_cred;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358 long sk_rcvtimeo;
359 long sk_sndtimeo;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360 void *sk_protinfo;
361 struct timer_list sk_timer;
Eric Dumazetb7aa0bf2007-04-19 16:16:32 -0700362 ktime_t sk_stamp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363 struct socket *sk_socket;
364 void *sk_user_data;
365 struct page *sk_sndmsg_page;
366 struct sk_buff *sk_send_head;
367 __u32 sk_sndmsg_off;
Pavel Emelyanovef64a542012-02-21 07:31:34 +0000368 __s32 sk_peek_off;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700369 int sk_write_pending;
Alexey Dobriyand5f64232008-11-04 14:45:58 -0800370#ifdef CONFIG_SECURITY
Linus Torvalds1da177e2005-04-16 15:20:36 -0700371 void *sk_security;
Alexey Dobriyand5f64232008-11-04 14:45:58 -0800372#endif
Laszlo Attila Toth4a19ec52008-01-30 19:08:16 -0800373 __u32 sk_mark;
Herbert Xuf8451722010-05-24 00:12:34 -0700374 u32 sk_classid;
Glauber Costae1aab162011-12-11 21:47:03 +0000375 struct cg_proto *sk_cgrp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376 void (*sk_state_change)(struct sock *sk);
377 void (*sk_data_ready)(struct sock *sk, int bytes);
378 void (*sk_write_space)(struct sock *sk);
379 void (*sk_error_report)(struct sock *sk);
Eric Dumazetdc6b9b72012-05-16 22:48:15 +0000380 int (*sk_backlog_rcv)(struct sock *sk,
381 struct sk_buff *skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700382 void (*sk_destruct)(struct sock *sk);
383};
384
Pavel Emelyanov4a17fd52012-04-19 03:39:36 +0000385/*
386 * SK_CAN_REUSE and SK_NO_REUSE on a socket mean that the socket is OK
387 * or not whether his port will be reused by someone else. SK_FORCE_REUSE
388 * on a socket means that the socket will reuse everybody else's port
389 * without looking at the other's sk_reuse value.
390 */
391
392#define SK_NO_REUSE 0
393#define SK_CAN_REUSE 1
394#define SK_FORCE_REUSE 2
395
Pavel Emelyanovef64a542012-02-21 07:31:34 +0000396static inline int sk_peek_offset(struct sock *sk, int flags)
397{
398 if ((flags & MSG_PEEK) && (sk->sk_peek_off >= 0))
399 return sk->sk_peek_off;
400 else
401 return 0;
402}
403
404static inline void sk_peek_offset_bwd(struct sock *sk, int val)
405{
406 if (sk->sk_peek_off >= 0) {
407 if (sk->sk_peek_off >= val)
408 sk->sk_peek_off -= val;
409 else
410 sk->sk_peek_off = 0;
411 }
412}
413
414static inline void sk_peek_offset_fwd(struct sock *sk, int val)
415{
416 if (sk->sk_peek_off >= 0)
417 sk->sk_peek_off += val;
418}
419
Linus Torvalds1da177e2005-04-16 15:20:36 -0700420/*
421 * Hashed lists helper routines
422 */
Li Zefanc4146642010-02-08 23:18:45 +0000423static inline struct sock *sk_entry(const struct hlist_node *node)
424{
425 return hlist_entry(node, struct sock, sk_node);
426}
427
Arnaldo Carvalho de Meloe48c4142005-08-09 20:09:46 -0700428static inline struct sock *__sk_head(const struct hlist_head *head)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700429{
430 return hlist_entry(head->first, struct sock, sk_node);
431}
432
Arnaldo Carvalho de Meloe48c4142005-08-09 20:09:46 -0700433static inline struct sock *sk_head(const struct hlist_head *head)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700434{
435 return hlist_empty(head) ? NULL : __sk_head(head);
436}
437
Eric Dumazet88ab1932008-11-16 19:39:21 -0800438static inline struct sock *__sk_nulls_head(const struct hlist_nulls_head *head)
439{
440 return hlist_nulls_entry(head->first, struct sock, sk_nulls_node);
441}
442
443static inline struct sock *sk_nulls_head(const struct hlist_nulls_head *head)
444{
445 return hlist_nulls_empty(head) ? NULL : __sk_nulls_head(head);
446}
447
Arnaldo Carvalho de Meloe48c4142005-08-09 20:09:46 -0700448static inline struct sock *sk_next(const struct sock *sk)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449{
450 return sk->sk_node.next ?
451 hlist_entry(sk->sk_node.next, struct sock, sk_node) : NULL;
452}
453
Eric Dumazet88ab1932008-11-16 19:39:21 -0800454static inline struct sock *sk_nulls_next(const struct sock *sk)
455{
456 return (!is_a_nulls(sk->sk_nulls_node.next)) ?
457 hlist_nulls_entry(sk->sk_nulls_node.next,
458 struct sock, sk_nulls_node) :
459 NULL;
460}
461
Eric Dumazetdc6b9b72012-05-16 22:48:15 +0000462static inline bool sk_unhashed(const struct sock *sk)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700463{
464 return hlist_unhashed(&sk->sk_node);
465}
466
Eric Dumazetdc6b9b72012-05-16 22:48:15 +0000467static inline bool sk_hashed(const struct sock *sk)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700468{
Akinobu Mitada753be2006-04-28 15:21:23 -0700469 return !sk_unhashed(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700470}
471
Eric Dumazetdc6b9b72012-05-16 22:48:15 +0000472static inline void sk_node_init(struct hlist_node *node)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700473{
474 node->pprev = NULL;
475}
476
Eric Dumazetdc6b9b72012-05-16 22:48:15 +0000477static inline void sk_nulls_node_init(struct hlist_nulls_node *node)
Eric Dumazet88ab1932008-11-16 19:39:21 -0800478{
479 node->pprev = NULL;
480}
481
Eric Dumazetdc6b9b72012-05-16 22:48:15 +0000482static inline void __sk_del_node(struct sock *sk)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483{
484 __hlist_del(&sk->sk_node);
485}
486
stephen hemminger808f5112010-02-22 07:57:18 +0000487/* NB: equivalent to hlist_del_init_rcu */
Eric Dumazetdc6b9b72012-05-16 22:48:15 +0000488static inline bool __sk_del_node_init(struct sock *sk)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700489{
490 if (sk_hashed(sk)) {
491 __sk_del_node(sk);
492 sk_node_init(&sk->sk_node);
Eric Dumazetdc6b9b72012-05-16 22:48:15 +0000493 return true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700494 }
Eric Dumazetdc6b9b72012-05-16 22:48:15 +0000495 return false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700496}
497
498/* Grab socket reference count. This operation is valid only
499 when sk is ALREADY grabbed f.e. it is found in hash table
500 or a list and the lookup is made under lock preventing hash table
501 modifications.
502 */
503
504static inline void sock_hold(struct sock *sk)
505{
506 atomic_inc(&sk->sk_refcnt);
507}
508
509/* Ungrab socket in the context, which assumes that socket refcnt
510 cannot hit zero, f.e. it is true in context of any socketcall.
511 */
512static inline void __sock_put(struct sock *sk)
513{
514 atomic_dec(&sk->sk_refcnt);
515}
516
Eric Dumazetdc6b9b72012-05-16 22:48:15 +0000517static inline bool sk_del_node_init(struct sock *sk)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700518{
Eric Dumazetdc6b9b72012-05-16 22:48:15 +0000519 bool rc = __sk_del_node_init(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700520
521 if (rc) {
522 /* paranoid for a while -acme */
523 WARN_ON(atomic_read(&sk->sk_refcnt) == 1);
524 __sock_put(sk);
525 }
526 return rc;
527}
stephen hemminger808f5112010-02-22 07:57:18 +0000528#define sk_del_node_init_rcu(sk) sk_del_node_init(sk)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700529
Eric Dumazetdc6b9b72012-05-16 22:48:15 +0000530static inline bool __sk_nulls_del_node_init_rcu(struct sock *sk)
Eric Dumazet271b72c2008-10-29 02:11:14 -0700531{
532 if (sk_hashed(sk)) {
Eric Dumazet88ab1932008-11-16 19:39:21 -0800533 hlist_nulls_del_init_rcu(&sk->sk_nulls_node);
Eric Dumazetdc6b9b72012-05-16 22:48:15 +0000534 return true;
Eric Dumazet271b72c2008-10-29 02:11:14 -0700535 }
Eric Dumazetdc6b9b72012-05-16 22:48:15 +0000536 return false;
Eric Dumazet271b72c2008-10-29 02:11:14 -0700537}
538
Eric Dumazetdc6b9b72012-05-16 22:48:15 +0000539static inline bool sk_nulls_del_node_init_rcu(struct sock *sk)
Eric Dumazet271b72c2008-10-29 02:11:14 -0700540{
Eric Dumazetdc6b9b72012-05-16 22:48:15 +0000541 bool rc = __sk_nulls_del_node_init_rcu(sk);
Eric Dumazet271b72c2008-10-29 02:11:14 -0700542
543 if (rc) {
544 /* paranoid for a while -acme */
545 WARN_ON(atomic_read(&sk->sk_refcnt) == 1);
546 __sock_put(sk);
547 }
548 return rc;
549}
550
Eric Dumazetdc6b9b72012-05-16 22:48:15 +0000551static inline void __sk_add_node(struct sock *sk, struct hlist_head *list)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700552{
553 hlist_add_head(&sk->sk_node, list);
554}
555
Eric Dumazetdc6b9b72012-05-16 22:48:15 +0000556static inline void sk_add_node(struct sock *sk, struct hlist_head *list)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557{
558 sock_hold(sk);
559 __sk_add_node(sk, list);
560}
561
Eric Dumazetdc6b9b72012-05-16 22:48:15 +0000562static inline void sk_add_node_rcu(struct sock *sk, struct hlist_head *list)
stephen hemminger808f5112010-02-22 07:57:18 +0000563{
564 sock_hold(sk);
565 hlist_add_head_rcu(&sk->sk_node, list);
566}
567
Eric Dumazetdc6b9b72012-05-16 22:48:15 +0000568static inline void __sk_nulls_add_node_rcu(struct sock *sk, struct hlist_nulls_head *list)
Eric Dumazet271b72c2008-10-29 02:11:14 -0700569{
Eric Dumazet88ab1932008-11-16 19:39:21 -0800570 hlist_nulls_add_head_rcu(&sk->sk_nulls_node, list);
Eric Dumazet271b72c2008-10-29 02:11:14 -0700571}
572
Eric Dumazetdc6b9b72012-05-16 22:48:15 +0000573static inline void sk_nulls_add_node_rcu(struct sock *sk, struct hlist_nulls_head *list)
Eric Dumazet271b72c2008-10-29 02:11:14 -0700574{
575 sock_hold(sk);
Eric Dumazet88ab1932008-11-16 19:39:21 -0800576 __sk_nulls_add_node_rcu(sk, list);
Eric Dumazet271b72c2008-10-29 02:11:14 -0700577}
578
Eric Dumazetdc6b9b72012-05-16 22:48:15 +0000579static inline void __sk_del_bind_node(struct sock *sk)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700580{
581 __hlist_del(&sk->sk_bind_node);
582}
583
Eric Dumazetdc6b9b72012-05-16 22:48:15 +0000584static inline void sk_add_bind_node(struct sock *sk,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700585 struct hlist_head *list)
586{
587 hlist_add_head(&sk->sk_bind_node, list);
588}
589
590#define sk_for_each(__sk, node, list) \
591 hlist_for_each_entry(__sk, node, list, sk_node)
stephen hemminger808f5112010-02-22 07:57:18 +0000592#define sk_for_each_rcu(__sk, node, list) \
593 hlist_for_each_entry_rcu(__sk, node, list, sk_node)
Eric Dumazet88ab1932008-11-16 19:39:21 -0800594#define sk_nulls_for_each(__sk, node, list) \
595 hlist_nulls_for_each_entry(__sk, node, list, sk_nulls_node)
596#define sk_nulls_for_each_rcu(__sk, node, list) \
597 hlist_nulls_for_each_entry_rcu(__sk, node, list, sk_nulls_node)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700598#define sk_for_each_from(__sk, node) \
599 if (__sk && ({ node = &(__sk)->sk_node; 1; })) \
600 hlist_for_each_entry_from(__sk, node, sk_node)
Eric Dumazet88ab1932008-11-16 19:39:21 -0800601#define sk_nulls_for_each_from(__sk, node) \
602 if (__sk && ({ node = &(__sk)->sk_nulls_node; 1; })) \
603 hlist_nulls_for_each_entry_from(__sk, node, sk_nulls_node)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700604#define sk_for_each_safe(__sk, node, tmp, list) \
605 hlist_for_each_entry_safe(__sk, node, tmp, list, sk_node)
606#define sk_for_each_bound(__sk, node, list) \
607 hlist_for_each_entry(__sk, node, list, sk_bind_node)
608
609/* Sock flags */
610enum sock_flags {
611 SOCK_DEAD,
612 SOCK_DONE,
613 SOCK_URGINLINE,
614 SOCK_KEEPOPEN,
615 SOCK_LINGER,
616 SOCK_DESTROY,
617 SOCK_BROADCAST,
618 SOCK_TIMESTAMP,
619 SOCK_ZAPPED,
620 SOCK_USE_WRITE_QUEUE, /* whether to call sk->sk_write_space in sock_wfree */
621 SOCK_DBG, /* %SO_DEBUG setting */
622 SOCK_RCVTSTAMP, /* %SO_TIMESTAMP setting */
Eric Dumazet92f37fd2007-03-25 22:14:49 -0700623 SOCK_RCVTSTAMPNS, /* %SO_TIMESTAMPNS setting */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700624 SOCK_LOCALROUTE, /* route locally only, %SO_DONTROUTE setting */
625 SOCK_QUEUE_SHRUNK, /* write queue has been shrunk recently */
Mel Gorman7cb02402012-07-31 16:44:16 -0700626 SOCK_MEMALLOC, /* VM depends on this socket for swapping */
Patrick Ohly20d49472009-02-12 05:03:38 +0000627 SOCK_TIMESTAMPING_TX_HARDWARE, /* %SOF_TIMESTAMPING_TX_HARDWARE */
628 SOCK_TIMESTAMPING_TX_SOFTWARE, /* %SOF_TIMESTAMPING_TX_SOFTWARE */
629 SOCK_TIMESTAMPING_RX_HARDWARE, /* %SOF_TIMESTAMPING_RX_HARDWARE */
630 SOCK_TIMESTAMPING_RX_SOFTWARE, /* %SOF_TIMESTAMPING_RX_SOFTWARE */
631 SOCK_TIMESTAMPING_SOFTWARE, /* %SOF_TIMESTAMPING_SOFTWARE */
632 SOCK_TIMESTAMPING_RAW_HARDWARE, /* %SOF_TIMESTAMPING_RAW_HARDWARE */
633 SOCK_TIMESTAMPING_SYS_HARDWARE, /* %SOF_TIMESTAMPING_SYS_HARDWARE */
Eric Dumazetbcdce712009-10-06 17:28:29 -0700634 SOCK_FASYNC, /* fasync() active */
Neil Horman3b885782009-10-12 13:26:31 -0700635 SOCK_RXQ_OVFL,
Shirley Ma1cdebb42011-07-06 12:17:30 +0000636 SOCK_ZEROCOPY, /* buffers from userspace */
Johannes Berg6e3e9392011-11-09 10:15:42 +0100637 SOCK_WIFI_STATUS, /* push wifi status to userspace */
Ben Greear3bdc0eb2012-02-11 15:39:30 +0000638 SOCK_NOFCS, /* Tell NIC not to do the Ethernet FCS.
639 * Will use last 4 bytes of packet sent from
640 * user-space instead.
641 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700642};
643
Ralf Baechle53b924b2005-08-23 10:11:30 -0700644static inline void sock_copy_flags(struct sock *nsk, struct sock *osk)
645{
646 nsk->sk_flags = osk->sk_flags;
647}
648
Linus Torvalds1da177e2005-04-16 15:20:36 -0700649static inline void sock_set_flag(struct sock *sk, enum sock_flags flag)
650{
651 __set_bit(flag, &sk->sk_flags);
652}
653
654static inline void sock_reset_flag(struct sock *sk, enum sock_flags flag)
655{
656 __clear_bit(flag, &sk->sk_flags);
657}
658
Eric Dumazet1b23a5d2012-05-16 05:57:07 +0000659static inline bool sock_flag(const struct sock *sk, enum sock_flags flag)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700660{
661 return test_bit(flag, &sk->sk_flags);
662}
663
Mel Gormanc93bdd02012-07-31 16:44:19 -0700664#ifdef CONFIG_NET
665extern struct static_key memalloc_socks;
666static inline int sk_memalloc_socks(void)
667{
668 return static_key_false(&memalloc_socks);
669}
670#else
671
672static inline int sk_memalloc_socks(void)
673{
674 return 0;
675}
676
677#endif
678
Mel Gorman99a1dec2012-07-31 16:44:14 -0700679static inline gfp_t sk_gfp_atomic(struct sock *sk, gfp_t gfp_mask)
680{
Mel Gorman7cb02402012-07-31 16:44:16 -0700681 return GFP_ATOMIC | (sk->sk_allocation & __GFP_MEMALLOC);
Mel Gorman99a1dec2012-07-31 16:44:14 -0700682}
683
Linus Torvalds1da177e2005-04-16 15:20:36 -0700684static inline void sk_acceptq_removed(struct sock *sk)
685{
686 sk->sk_ack_backlog--;
687}
688
689static inline void sk_acceptq_added(struct sock *sk)
690{
691 sk->sk_ack_backlog++;
692}
693
Eric Dumazetdc6b9b72012-05-16 22:48:15 +0000694static inline bool sk_acceptq_is_full(const struct sock *sk)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700695{
David S. Miller64a14652007-03-06 11:21:05 -0800696 return sk->sk_ack_backlog > sk->sk_max_ack_backlog;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700697}
698
699/*
700 * Compute minimal free write space needed to queue new packets.
701 */
Eric Dumazetdc6b9b72012-05-16 22:48:15 +0000702static inline int sk_stream_min_wspace(const struct sock *sk)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700703{
Eric Dumazet8df09ea2007-12-21 03:07:41 -0800704 return sk->sk_wmem_queued >> 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700705}
706
Eric Dumazetdc6b9b72012-05-16 22:48:15 +0000707static inline int sk_stream_wspace(const struct sock *sk)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700708{
709 return sk->sk_sndbuf - sk->sk_wmem_queued;
710}
711
712extern void sk_stream_write_space(struct sock *sk);
713
Eric Dumazetdc6b9b72012-05-16 22:48:15 +0000714static inline bool sk_stream_memory_free(const struct sock *sk)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700715{
716 return sk->sk_wmem_queued < sk->sk_sndbuf;
717}
718
Zhu Yi8eae9392010-03-04 18:01:40 +0000719/* OOB backlog add */
Zhu Yia3a858f2010-03-04 18:01:47 +0000720static inline void __sk_add_backlog(struct sock *sk, struct sk_buff *skb)
Stephen Hemminger9ee6b532005-11-08 09:39:42 -0800721{
Eric Dumazet7fee2262010-05-11 23:19:48 +0000722 /* dont let skb dst not refcounted, we are going to leave rcu lock */
723 skb_dst_force(skb);
724
725 if (!sk->sk_backlog.tail)
726 sk->sk_backlog.head = skb;
727 else
Stephen Hemminger9ee6b532005-11-08 09:39:42 -0800728 sk->sk_backlog.tail->next = skb;
Eric Dumazet7fee2262010-05-11 23:19:48 +0000729
730 sk->sk_backlog.tail = skb;
Stephen Hemminger9ee6b532005-11-08 09:39:42 -0800731 skb->next = NULL;
732}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700733
Eric Dumazetc3774112010-04-27 15:13:20 -0700734/*
735 * Take into account size of receive queue and backlog queue
Eric Dumazet0fd7bac2011-12-21 07:11:44 +0000736 * Do not take into account this skb truesize,
737 * to allow even a single big packet to come.
Eric Dumazetc3774112010-04-27 15:13:20 -0700738 */
Eric Dumazetf545a382012-04-22 23:34:26 +0000739static inline bool sk_rcvqueues_full(const struct sock *sk, const struct sk_buff *skb,
740 unsigned int limit)
Eric Dumazetc3774112010-04-27 15:13:20 -0700741{
742 unsigned int qsize = sk->sk_backlog.len + atomic_read(&sk->sk_rmem_alloc);
743
Eric Dumazetf545a382012-04-22 23:34:26 +0000744 return qsize > limit;
Eric Dumazetc3774112010-04-27 15:13:20 -0700745}
746
Zhu Yi8eae9392010-03-04 18:01:40 +0000747/* The per-socket spinlock must be held here. */
Eric Dumazetf545a382012-04-22 23:34:26 +0000748static inline __must_check int sk_add_backlog(struct sock *sk, struct sk_buff *skb,
749 unsigned int limit)
Zhu Yi8eae9392010-03-04 18:01:40 +0000750{
Eric Dumazetf545a382012-04-22 23:34:26 +0000751 if (sk_rcvqueues_full(sk, skb, limit))
Zhu Yi8eae9392010-03-04 18:01:40 +0000752 return -ENOBUFS;
753
Zhu Yia3a858f2010-03-04 18:01:47 +0000754 __sk_add_backlog(sk, skb);
Zhu Yi8eae9392010-03-04 18:01:40 +0000755 sk->sk_backlog.len += skb->truesize;
756 return 0;
757}
758
Mel Gormanb4b9e352012-07-31 16:44:26 -0700759extern int __sk_backlog_rcv(struct sock *sk, struct sk_buff *skb);
760
Peter Zijlstrac57943a2008-10-07 14:18:42 -0700761static inline int sk_backlog_rcv(struct sock *sk, struct sk_buff *skb)
762{
Mel Gormanb4b9e352012-07-31 16:44:26 -0700763 if (sk_memalloc_socks() && skb_pfmemalloc(skb))
764 return __sk_backlog_rcv(sk, skb);
765
Peter Zijlstrac57943a2008-10-07 14:18:42 -0700766 return sk->sk_backlog_rcv(sk, skb);
767}
768
David S. Millerc58dc012010-04-27 15:05:31 -0700769static inline void sock_rps_record_flow(const struct sock *sk)
770{
771#ifdef CONFIG_RPS
772 struct rps_sock_flow_table *sock_flow_table;
773
774 rcu_read_lock();
775 sock_flow_table = rcu_dereference(rps_sock_flow_table);
776 rps_record_sock_flow(sock_flow_table, sk->sk_rxhash);
777 rcu_read_unlock();
778#endif
779}
780
781static inline void sock_rps_reset_flow(const struct sock *sk)
782{
783#ifdef CONFIG_RPS
784 struct rps_sock_flow_table *sock_flow_table;
785
786 rcu_read_lock();
787 sock_flow_table = rcu_dereference(rps_sock_flow_table);
788 rps_reset_sock_flow(sock_flow_table, sk->sk_rxhash);
789 rcu_read_unlock();
790#endif
791}
792
Tom Herbertbdeab992011-08-14 19:45:55 +0000793static inline void sock_rps_save_rxhash(struct sock *sk,
794 const struct sk_buff *skb)
David S. Millerc58dc012010-04-27 15:05:31 -0700795{
796#ifdef CONFIG_RPS
Tom Herbertbdeab992011-08-14 19:45:55 +0000797 if (unlikely(sk->sk_rxhash != skb->rxhash)) {
David S. Millerc58dc012010-04-27 15:05:31 -0700798 sock_rps_reset_flow(sk);
Tom Herbertbdeab992011-08-14 19:45:55 +0000799 sk->sk_rxhash = skb->rxhash;
David S. Millerc58dc012010-04-27 15:05:31 -0700800 }
801#endif
802}
803
Tom Herbertbdeab992011-08-14 19:45:55 +0000804static inline void sock_rps_reset_rxhash(struct sock *sk)
805{
806#ifdef CONFIG_RPS
807 sock_rps_reset_flow(sk);
808 sk->sk_rxhash = 0;
809#endif
810}
811
Stephen Hemmingercfcabdc2007-10-09 01:59:42 -0700812#define sk_wait_event(__sk, __timeo, __condition) \
813 ({ int __rc; \
814 release_sock(__sk); \
815 __rc = __condition; \
816 if (!__rc) { \
817 *(__timeo) = schedule_timeout(*(__timeo)); \
818 } \
819 lock_sock(__sk); \
820 __rc = __condition; \
821 __rc; \
822 })
Linus Torvalds1da177e2005-04-16 15:20:36 -0700823
824extern int sk_stream_wait_connect(struct sock *sk, long *timeo_p);
825extern int sk_stream_wait_memory(struct sock *sk, long *timeo_p);
826extern void sk_stream_wait_close(struct sock *sk, long timeo_p);
827extern int sk_stream_error(struct sock *sk, int flags, int err);
828extern void sk_stream_kill_queues(struct sock *sk);
Mel Gorman7cb02402012-07-31 16:44:16 -0700829extern void sk_set_memalloc(struct sock *sk);
830extern void sk_clear_memalloc(struct sock *sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700831
832extern int sk_wait_data(struct sock *sk, long *timeo);
833
Arnaldo Carvalho de Melo60236fd2005-06-18 22:47:21 -0700834struct request_sock_ops;
Arnaldo Carvalho de Melo6d6ee432005-12-13 23:25:19 -0800835struct timewait_sock_ops;
Arnaldo Carvalho de Meloab1e0a12008-02-03 04:06:04 -0800836struct inet_hashinfo;
Pavel Emelyanovfc8717b2008-03-22 16:56:51 -0700837struct raw_hashinfo;
Paul Gortmakerde477252011-05-26 13:46:22 -0400838struct module;
Arnaldo Carvalho de Melo2e6599c2005-06-18 22:46:52 -0700839
Linus Torvalds1da177e2005-04-16 15:20:36 -0700840/* Networking protocol blocks we attach to sockets.
841 * socket layer -> transport layer interface
842 * transport -> network interface is defined by struct inet_proto
843 */
844struct proto {
Eric Dumazetdc6b9b72012-05-16 22:48:15 +0000845 void (*close)(struct sock *sk,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700846 long timeout);
847 int (*connect)(struct sock *sk,
Eric Dumazetdc6b9b72012-05-16 22:48:15 +0000848 struct sockaddr *uaddr,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700849 int addr_len);
850 int (*disconnect)(struct sock *sk, int flags);
851
Eric Dumazetdc6b9b72012-05-16 22:48:15 +0000852 struct sock * (*accept)(struct sock *sk, int flags, int *err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700853
854 int (*ioctl)(struct sock *sk, int cmd,
855 unsigned long arg);
856 int (*init)(struct sock *sk);
Brian Haley7d06b2e2008-06-14 17:04:49 -0700857 void (*destroy)(struct sock *sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700858 void (*shutdown)(struct sock *sk, int how);
Eric Dumazetdc6b9b72012-05-16 22:48:15 +0000859 int (*setsockopt)(struct sock *sk, int level,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700860 int optname, char __user *optval,
David S. Millerb7058842009-09-30 16:12:20 -0700861 unsigned int optlen);
Eric Dumazetdc6b9b72012-05-16 22:48:15 +0000862 int (*getsockopt)(struct sock *sk, int level,
863 int optname, char __user *optval,
864 int __user *option);
Alexey Dobriyanaf01d532008-08-28 02:53:51 -0700865#ifdef CONFIG_COMPAT
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800866 int (*compat_setsockopt)(struct sock *sk,
867 int level,
868 int optname, char __user *optval,
David S. Millerb7058842009-09-30 16:12:20 -0700869 unsigned int optlen);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800870 int (*compat_getsockopt)(struct sock *sk,
871 int level,
872 int optname, char __user *optval,
873 int __user *option);
Eric W. Biederman709b46e2011-01-29 16:15:56 +0000874 int (*compat_ioctl)(struct sock *sk,
875 unsigned int cmd, unsigned long arg);
Alexey Dobriyanaf01d532008-08-28 02:53:51 -0700876#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700877 int (*sendmsg)(struct kiocb *iocb, struct sock *sk,
878 struct msghdr *msg, size_t len);
879 int (*recvmsg)(struct kiocb *iocb, struct sock *sk,
880 struct msghdr *msg,
Eric Dumazetdc6b9b72012-05-16 22:48:15 +0000881 size_t len, int noblock, int flags,
882 int *addr_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700883 int (*sendpage)(struct sock *sk, struct page *page,
884 int offset, size_t size, int flags);
Eric Dumazetdc6b9b72012-05-16 22:48:15 +0000885 int (*bind)(struct sock *sk,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700886 struct sockaddr *uaddr, int addr_len);
887
Eric Dumazetdc6b9b72012-05-16 22:48:15 +0000888 int (*backlog_rcv) (struct sock *sk,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700889 struct sk_buff *skb);
890
Eric Dumazet46d3cea2012-07-11 05:50:31 +0000891 void (*release_cb)(struct sock *sk);
Eric Dumazet563d34d2012-07-23 09:48:52 +0200892 void (*mtu_reduced)(struct sock *sk);
Eric Dumazet46d3cea2012-07-11 05:50:31 +0000893
Linus Torvalds1da177e2005-04-16 15:20:36 -0700894 /* Keeping track of sk's, looking them up, and port selection methods. */
895 void (*hash)(struct sock *sk);
896 void (*unhash)(struct sock *sk);
Eric Dumazet719f8352010-09-08 05:08:44 +0000897 void (*rehash)(struct sock *sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700898 int (*get_port)(struct sock *sk, unsigned short snum);
Octavian Purdilafcbdf092010-12-16 14:26:56 -0800899 void (*clear_sk)(struct sock *sk, int size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700900
Eric Dumazet286ab3d2007-11-05 23:38:39 -0800901 /* Keeping track of sockets in use */
Eric Dumazet65f76512008-01-03 20:46:48 -0800902#ifdef CONFIG_PROC_FS
Pavel Emelyanov13ff3d62008-03-28 16:38:17 -0700903 unsigned int inuse_idx;
Eric Dumazet65f76512008-01-03 20:46:48 -0800904#endif
Arnaldo Carvalho de Meloebb53d72007-11-21 22:08:50 +0800905
Linus Torvalds1da177e2005-04-16 15:20:36 -0700906 /* Memory pressure */
Pavel Emelyanov5c52ba12008-07-16 20:28:10 -0700907 void (*enter_memory_pressure)(struct sock *sk);
Eric Dumazet8d987e52010-11-09 23:24:26 +0000908 atomic_long_t *memory_allocated; /* Current allocated memory. */
Eric Dumazet17483762008-11-25 21:16:35 -0800909 struct percpu_counter *sockets_allocated; /* Current number of sockets. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700910 /*
911 * Pressure flag: try to collapse.
912 * Technical note: it is used by multiple contexts non atomically.
Hideo Aoki3ab224b2007-12-31 00:11:19 -0800913 * All the __sk_mem_schedule() is of this nature: accounting
Linus Torvalds1da177e2005-04-16 15:20:36 -0700914 * is strict, actions are advisory and have some latency.
915 */
916 int *memory_pressure;
Eric Dumazet8d987e52010-11-09 23:24:26 +0000917 long *sysctl_mem;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700918 int *sysctl_wmem;
919 int *sysctl_rmem;
920 int max_header;
Changli Gao7ba42912010-07-10 20:41:55 +0000921 bool no_autobind;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700922
Eric Dumazet271b72c2008-10-29 02:11:14 -0700923 struct kmem_cache *slab;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700924 unsigned int obj_size;
Eric Dumazet271b72c2008-10-29 02:11:14 -0700925 int slab_flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700926
Eric Dumazetdd24c002008-11-25 21:17:14 -0800927 struct percpu_counter *orphan_count;
Arnaldo Carvalho de Melo8feaf0c02005-08-09 20:09:30 -0700928
Arnaldo Carvalho de Melo60236fd2005-06-18 22:47:21 -0700929 struct request_sock_ops *rsk_prot;
Arnaldo Carvalho de Melo6d6ee432005-12-13 23:25:19 -0800930 struct timewait_sock_ops *twsk_prot;
Arnaldo Carvalho de Melo2e6599c2005-06-18 22:46:52 -0700931
Pavel Emelyanov39d8cda2008-03-22 16:50:58 -0700932 union {
933 struct inet_hashinfo *hashinfo;
Eric Dumazet645ca702008-10-29 01:41:45 -0700934 struct udp_table *udp_table;
Pavel Emelyanovfc8717b2008-03-22 16:56:51 -0700935 struct raw_hashinfo *raw_hash;
Pavel Emelyanov39d8cda2008-03-22 16:50:58 -0700936 } h;
Arnaldo Carvalho de Meloab1e0a12008-02-03 04:06:04 -0800937
Linus Torvalds1da177e2005-04-16 15:20:36 -0700938 struct module *owner;
939
940 char name[32];
941
942 struct list_head node;
Arnaldo Carvalho de Meloe6848972005-08-09 19:45:38 -0700943#ifdef SOCK_REFCNT_DEBUG
944 atomic_t socks;
945#endif
Andrew Mortonc255a452012-07-31 16:43:02 -0700946#ifdef CONFIG_MEMCG_KMEM
Glauber Costae1aab162011-12-11 21:47:03 +0000947 /*
948 * cgroup specific init/deinit functions. Called once for all
949 * protocols that implement it, from cgroups populate function.
950 * This function has to setup any files the protocol want to
951 * appear in the kmem cgroup filesystem.
952 */
Glauber Costa1d62e432012-04-09 19:36:33 -0300953 int (*init_cgroup)(struct mem_cgroup *memcg,
Glauber Costae1aab162011-12-11 21:47:03 +0000954 struct cgroup_subsys *ss);
Glauber Costa1d62e432012-04-09 19:36:33 -0300955 void (*destroy_cgroup)(struct mem_cgroup *memcg);
Glauber Costae1aab162011-12-11 21:47:03 +0000956 struct cg_proto *(*proto_cgroup)(struct mem_cgroup *memcg);
957#endif
958};
959
Glauber Costa3f134612012-05-29 15:07:11 -0700960/*
961 * Bits in struct cg_proto.flags
962 */
963enum cg_proto_flags {
964 /* Currently active and new sockets should be assigned to cgroups */
965 MEMCG_SOCK_ACTIVE,
966 /* It was ever activated; we must disarm static keys on destruction */
967 MEMCG_SOCK_ACTIVATED,
968};
969
Glauber Costae1aab162011-12-11 21:47:03 +0000970struct cg_proto {
971 void (*enter_memory_pressure)(struct sock *sk);
972 struct res_counter *memory_allocated; /* Current allocated memory. */
973 struct percpu_counter *sockets_allocated; /* Current number of sockets. */
974 int *memory_pressure;
975 long *sysctl_mem;
Glauber Costa3f134612012-05-29 15:07:11 -0700976 unsigned long flags;
Glauber Costae1aab162011-12-11 21:47:03 +0000977 /*
978 * memcg field is used to find which memcg we belong directly
979 * Each memcg struct can hold more than one cg_proto, so container_of
980 * won't really cut.
981 *
982 * The elegant solution would be having an inverse function to
983 * proto_cgroup in struct proto, but that means polluting the structure
984 * for everybody, instead of just for memcg users.
985 */
986 struct mem_cgroup *memcg;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700987};
988
989extern int proto_register(struct proto *prot, int alloc_slab);
990extern void proto_unregister(struct proto *prot);
991
Glauber Costa3f134612012-05-29 15:07:11 -0700992static inline bool memcg_proto_active(struct cg_proto *cg_proto)
993{
994 return test_bit(MEMCG_SOCK_ACTIVE, &cg_proto->flags);
995}
996
997static inline bool memcg_proto_activated(struct cg_proto *cg_proto)
998{
999 return test_bit(MEMCG_SOCK_ACTIVATED, &cg_proto->flags);
1000}
1001
Arnaldo Carvalho de Meloe6848972005-08-09 19:45:38 -07001002#ifdef SOCK_REFCNT_DEBUG
1003static inline void sk_refcnt_debug_inc(struct sock *sk)
1004{
1005 atomic_inc(&sk->sk_prot->socks);
1006}
1007
1008static inline void sk_refcnt_debug_dec(struct sock *sk)
1009{
1010 atomic_dec(&sk->sk_prot->socks);
1011 printk(KERN_DEBUG "%s socket %p released, %d are still alive\n",
1012 sk->sk_prot->name, sk, atomic_read(&sk->sk_prot->socks));
1013}
1014
Glauber Costae1aab162011-12-11 21:47:03 +00001015inline void sk_refcnt_debug_release(const struct sock *sk)
Arnaldo Carvalho de Meloe6848972005-08-09 19:45:38 -07001016{
1017 if (atomic_read(&sk->sk_refcnt) != 1)
1018 printk(KERN_DEBUG "Destruction of the %s socket %p delayed, refcnt=%d\n",
1019 sk->sk_prot->name, sk, atomic_read(&sk->sk_refcnt));
1020}
1021#else /* SOCK_REFCNT_DEBUG */
1022#define sk_refcnt_debug_inc(sk) do { } while (0)
1023#define sk_refcnt_debug_dec(sk) do { } while (0)
1024#define sk_refcnt_debug_release(sk) do { } while (0)
1025#endif /* SOCK_REFCNT_DEBUG */
1026
Andrew Mortonc255a452012-07-31 16:43:02 -07001027#if defined(CONFIG_MEMCG_KMEM) && defined(CONFIG_NET)
Ingo Molnarc5905af2012-02-24 08:31:31 +01001028extern struct static_key memcg_socket_limit_enabled;
Glauber Costae1aab162011-12-11 21:47:03 +00001029static inline struct cg_proto *parent_cg_proto(struct proto *proto,
1030 struct cg_proto *cg_proto)
1031{
1032 return proto->proto_cgroup(parent_mem_cgroup(cg_proto->memcg));
1033}
Ingo Molnarc5905af2012-02-24 08:31:31 +01001034#define mem_cgroup_sockets_enabled static_key_false(&memcg_socket_limit_enabled)
Glauber Costae1aab162011-12-11 21:47:03 +00001035#else
1036#define mem_cgroup_sockets_enabled 0
1037static inline struct cg_proto *parent_cg_proto(struct proto *proto,
1038 struct cg_proto *cg_proto)
1039{
1040 return NULL;
1041}
1042#endif
1043
1044
Glauber Costa180d8cd2011-12-11 21:47:02 +00001045static inline bool sk_has_memory_pressure(const struct sock *sk)
1046{
1047 return sk->sk_prot->memory_pressure != NULL;
1048}
1049
1050static inline bool sk_under_memory_pressure(const struct sock *sk)
1051{
1052 if (!sk->sk_prot->memory_pressure)
1053 return false;
Glauber Costae1aab162011-12-11 21:47:03 +00001054
1055 if (mem_cgroup_sockets_enabled && sk->sk_cgrp)
1056 return !!*sk->sk_cgrp->memory_pressure;
1057
Glauber Costa180d8cd2011-12-11 21:47:02 +00001058 return !!*sk->sk_prot->memory_pressure;
1059}
1060
1061static inline void sk_leave_memory_pressure(struct sock *sk)
1062{
1063 int *memory_pressure = sk->sk_prot->memory_pressure;
1064
Glauber Costae1aab162011-12-11 21:47:03 +00001065 if (!memory_pressure)
1066 return;
1067
1068 if (*memory_pressure)
Glauber Costa180d8cd2011-12-11 21:47:02 +00001069 *memory_pressure = 0;
Glauber Costae1aab162011-12-11 21:47:03 +00001070
1071 if (mem_cgroup_sockets_enabled && sk->sk_cgrp) {
1072 struct cg_proto *cg_proto = sk->sk_cgrp;
1073 struct proto *prot = sk->sk_prot;
1074
1075 for (; cg_proto; cg_proto = parent_cg_proto(prot, cg_proto))
1076 if (*cg_proto->memory_pressure)
1077 *cg_proto->memory_pressure = 0;
1078 }
1079
Glauber Costa180d8cd2011-12-11 21:47:02 +00001080}
1081
1082static inline void sk_enter_memory_pressure(struct sock *sk)
1083{
Glauber Costae1aab162011-12-11 21:47:03 +00001084 if (!sk->sk_prot->enter_memory_pressure)
1085 return;
1086
1087 if (mem_cgroup_sockets_enabled && sk->sk_cgrp) {
1088 struct cg_proto *cg_proto = sk->sk_cgrp;
1089 struct proto *prot = sk->sk_prot;
1090
1091 for (; cg_proto; cg_proto = parent_cg_proto(prot, cg_proto))
1092 cg_proto->enter_memory_pressure(sk);
1093 }
1094
1095 sk->sk_prot->enter_memory_pressure(sk);
Glauber Costa180d8cd2011-12-11 21:47:02 +00001096}
1097
1098static inline long sk_prot_mem_limits(const struct sock *sk, int index)
1099{
1100 long *prot = sk->sk_prot->sysctl_mem;
Glauber Costae1aab162011-12-11 21:47:03 +00001101 if (mem_cgroup_sockets_enabled && sk->sk_cgrp)
1102 prot = sk->sk_cgrp->sysctl_mem;
Glauber Costa180d8cd2011-12-11 21:47:02 +00001103 return prot[index];
1104}
1105
Glauber Costae1aab162011-12-11 21:47:03 +00001106static inline void memcg_memory_allocated_add(struct cg_proto *prot,
1107 unsigned long amt,
1108 int *parent_status)
1109{
1110 struct res_counter *fail;
1111 int ret;
1112
Glauber Costa0e90b312012-01-20 04:57:16 +00001113 ret = res_counter_charge_nofail(prot->memory_allocated,
1114 amt << PAGE_SHIFT, &fail);
Glauber Costae1aab162011-12-11 21:47:03 +00001115 if (ret < 0)
1116 *parent_status = OVER_LIMIT;
1117}
1118
1119static inline void memcg_memory_allocated_sub(struct cg_proto *prot,
1120 unsigned long amt)
1121{
1122 res_counter_uncharge(prot->memory_allocated, amt << PAGE_SHIFT);
1123}
1124
1125static inline u64 memcg_memory_allocated_read(struct cg_proto *prot)
1126{
1127 u64 ret;
1128 ret = res_counter_read_u64(prot->memory_allocated, RES_USAGE);
1129 return ret >> PAGE_SHIFT;
1130}
1131
Glauber Costa180d8cd2011-12-11 21:47:02 +00001132static inline long
1133sk_memory_allocated(const struct sock *sk)
1134{
1135 struct proto *prot = sk->sk_prot;
Glauber Costae1aab162011-12-11 21:47:03 +00001136 if (mem_cgroup_sockets_enabled && sk->sk_cgrp)
1137 return memcg_memory_allocated_read(sk->sk_cgrp);
1138
Glauber Costa180d8cd2011-12-11 21:47:02 +00001139 return atomic_long_read(prot->memory_allocated);
1140}
1141
1142static inline long
Glauber Costae1aab162011-12-11 21:47:03 +00001143sk_memory_allocated_add(struct sock *sk, int amt, int *parent_status)
Glauber Costa180d8cd2011-12-11 21:47:02 +00001144{
1145 struct proto *prot = sk->sk_prot;
Glauber Costae1aab162011-12-11 21:47:03 +00001146
1147 if (mem_cgroup_sockets_enabled && sk->sk_cgrp) {
1148 memcg_memory_allocated_add(sk->sk_cgrp, amt, parent_status);
1149 /* update the root cgroup regardless */
1150 atomic_long_add_return(amt, prot->memory_allocated);
1151 return memcg_memory_allocated_read(sk->sk_cgrp);
1152 }
1153
Glauber Costa180d8cd2011-12-11 21:47:02 +00001154 return atomic_long_add_return(amt, prot->memory_allocated);
1155}
1156
1157static inline void
Glauber Costa0e90b312012-01-20 04:57:16 +00001158sk_memory_allocated_sub(struct sock *sk, int amt)
Glauber Costa180d8cd2011-12-11 21:47:02 +00001159{
1160 struct proto *prot = sk->sk_prot;
Glauber Costae1aab162011-12-11 21:47:03 +00001161
Glauber Costa0e90b312012-01-20 04:57:16 +00001162 if (mem_cgroup_sockets_enabled && sk->sk_cgrp)
Glauber Costae1aab162011-12-11 21:47:03 +00001163 memcg_memory_allocated_sub(sk->sk_cgrp, amt);
1164
Glauber Costa180d8cd2011-12-11 21:47:02 +00001165 atomic_long_sub(amt, prot->memory_allocated);
1166}
1167
1168static inline void sk_sockets_allocated_dec(struct sock *sk)
1169{
1170 struct proto *prot = sk->sk_prot;
Glauber Costae1aab162011-12-11 21:47:03 +00001171
1172 if (mem_cgroup_sockets_enabled && sk->sk_cgrp) {
1173 struct cg_proto *cg_proto = sk->sk_cgrp;
1174
1175 for (; cg_proto; cg_proto = parent_cg_proto(prot, cg_proto))
1176 percpu_counter_dec(cg_proto->sockets_allocated);
1177 }
1178
Glauber Costa180d8cd2011-12-11 21:47:02 +00001179 percpu_counter_dec(prot->sockets_allocated);
1180}
1181
1182static inline void sk_sockets_allocated_inc(struct sock *sk)
1183{
1184 struct proto *prot = sk->sk_prot;
Glauber Costae1aab162011-12-11 21:47:03 +00001185
1186 if (mem_cgroup_sockets_enabled && sk->sk_cgrp) {
1187 struct cg_proto *cg_proto = sk->sk_cgrp;
1188
1189 for (; cg_proto; cg_proto = parent_cg_proto(prot, cg_proto))
1190 percpu_counter_inc(cg_proto->sockets_allocated);
1191 }
1192
Glauber Costa180d8cd2011-12-11 21:47:02 +00001193 percpu_counter_inc(prot->sockets_allocated);
1194}
1195
1196static inline int
1197sk_sockets_allocated_read_positive(struct sock *sk)
1198{
1199 struct proto *prot = sk->sk_prot;
1200
Glauber Costae1aab162011-12-11 21:47:03 +00001201 if (mem_cgroup_sockets_enabled && sk->sk_cgrp)
Eric Dumazet518fbf92012-04-28 23:21:56 +00001202 return percpu_counter_read_positive(sk->sk_cgrp->sockets_allocated);
Glauber Costae1aab162011-12-11 21:47:03 +00001203
Eric Dumazet518fbf92012-04-28 23:21:56 +00001204 return percpu_counter_read_positive(prot->sockets_allocated);
Glauber Costa180d8cd2011-12-11 21:47:02 +00001205}
1206
1207static inline int
1208proto_sockets_allocated_sum_positive(struct proto *prot)
1209{
1210 return percpu_counter_sum_positive(prot->sockets_allocated);
1211}
1212
1213static inline long
1214proto_memory_allocated(struct proto *prot)
1215{
1216 return atomic_long_read(prot->memory_allocated);
1217}
1218
1219static inline bool
1220proto_memory_pressure(struct proto *prot)
1221{
1222 if (!prot->memory_pressure)
1223 return false;
1224 return !!*prot->memory_pressure;
1225}
1226
Eric Dumazet65f76512008-01-03 20:46:48 -08001227
1228#ifdef CONFIG_PROC_FS
Linus Torvalds1da177e2005-04-16 15:20:36 -07001229/* Called with local bh disabled */
Pavel Emelyanovc29a0bc2008-03-31 19:41:46 -07001230extern void sock_prot_inuse_add(struct net *net, struct proto *prot, int inc);
1231extern int sock_prot_inuse_get(struct net *net, struct proto *proto);
Eric Dumazet65f76512008-01-03 20:46:48 -08001232#else
Eric Dumazetdc6b9b72012-05-16 22:48:15 +00001233static inline void sock_prot_inuse_add(struct net *net, struct proto *prot,
Pavel Emelyanovc29a0bc2008-03-31 19:41:46 -07001234 int inc)
Eric Dumazet65f76512008-01-03 20:46:48 -08001235{
1236}
Eric Dumazet65f76512008-01-03 20:46:48 -08001237#endif
1238
Linus Torvalds1da177e2005-04-16 15:20:36 -07001239
Arnaldo Carvalho de Melo614c6cb2005-08-09 19:47:37 -07001240/* With per-bucket locks this operation is not-atomic, so that
1241 * this version is not worse.
1242 */
1243static inline void __sk_prot_rehash(struct sock *sk)
1244{
1245 sk->sk_prot->unhash(sk);
1246 sk->sk_prot->hash(sk);
1247}
1248
Octavian Purdilafcbdf092010-12-16 14:26:56 -08001249void sk_prot_clear_portaddr_nulls(struct sock *sk, int size);
1250
Linus Torvalds1da177e2005-04-16 15:20:36 -07001251/* About 10 seconds */
1252#define SOCK_DESTROY_TIME (10*HZ)
1253
1254/* Sockets 0-1023 can't be bound to unless you are superuser */
1255#define PROT_SOCK 1024
1256
1257#define SHUTDOWN_MASK 3
1258#define RCV_SHUTDOWN 1
1259#define SEND_SHUTDOWN 2
1260
1261#define SOCK_SNDBUF_LOCK 1
1262#define SOCK_RCVBUF_LOCK 2
1263#define SOCK_BINDADDR_LOCK 4
1264#define SOCK_BINDPORT_LOCK 8
1265
1266/* sock_iocb: used to kick off async processing of socket ios */
1267struct sock_iocb {
1268 struct list_head list;
1269
1270 int flags;
1271 int size;
1272 struct socket *sock;
1273 struct sock *sk;
1274 struct scm_cookie *scm;
1275 struct msghdr *msg, async_msg;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001276 struct kiocb *kiocb;
1277};
1278
1279static inline struct sock_iocb *kiocb_to_siocb(struct kiocb *iocb)
1280{
1281 return (struct sock_iocb *)iocb->private;
1282}
1283
1284static inline struct kiocb *siocb_to_kiocb(struct sock_iocb *si)
1285{
1286 return si->kiocb;
1287}
1288
1289struct socket_alloc {
1290 struct socket socket;
1291 struct inode vfs_inode;
1292};
1293
1294static inline struct socket *SOCKET_I(struct inode *inode)
1295{
1296 return &container_of(inode, struct socket_alloc, vfs_inode)->socket;
1297}
1298
1299static inline struct inode *SOCK_INODE(struct socket *socket)
1300{
1301 return &container_of(socket, struct socket_alloc, socket)->vfs_inode;
1302}
1303
Hideo Aoki3ab224b2007-12-31 00:11:19 -08001304/*
1305 * Functions for memory accounting
1306 */
1307extern int __sk_mem_schedule(struct sock *sk, int size, int kind);
1308extern void __sk_mem_reclaim(struct sock *sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001309
Hideo Aoki3ab224b2007-12-31 00:11:19 -08001310#define SK_MEM_QUANTUM ((int)PAGE_SIZE)
1311#define SK_MEM_QUANTUM_SHIFT ilog2(SK_MEM_QUANTUM)
1312#define SK_MEM_SEND 0
1313#define SK_MEM_RECV 1
Linus Torvalds1da177e2005-04-16 15:20:36 -07001314
Hideo Aoki3ab224b2007-12-31 00:11:19 -08001315static inline int sk_mem_pages(int amt)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001316{
Hideo Aoki3ab224b2007-12-31 00:11:19 -08001317 return (amt + SK_MEM_QUANTUM - 1) >> SK_MEM_QUANTUM_SHIFT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001318}
1319
Eric Dumazetdc6b9b72012-05-16 22:48:15 +00001320static inline bool sk_has_account(struct sock *sk)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001321{
Hideo Aoki3ab224b2007-12-31 00:11:19 -08001322 /* return true if protocol supports memory accounting */
1323 return !!sk->sk_prot->memory_allocated;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001324}
1325
Eric Dumazetdc6b9b72012-05-16 22:48:15 +00001326static inline bool sk_wmem_schedule(struct sock *sk, int size)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001327{
Hideo Aoki3ab224b2007-12-31 00:11:19 -08001328 if (!sk_has_account(sk))
Eric Dumazetdc6b9b72012-05-16 22:48:15 +00001329 return true;
Herbert Xud80d99d2005-09-01 17:48:23 -07001330 return size <= sk->sk_forward_alloc ||
Hideo Aoki3ab224b2007-12-31 00:11:19 -08001331 __sk_mem_schedule(sk, size, SK_MEM_SEND);
1332}
1333
Mel Gormanc76562b2012-07-31 16:44:41 -07001334static inline bool
1335sk_rmem_schedule(struct sock *sk, struct sk_buff *skb, unsigned int size)
Hideo Aoki3ab224b2007-12-31 00:11:19 -08001336{
1337 if (!sk_has_account(sk))
Eric Dumazetdc6b9b72012-05-16 22:48:15 +00001338 return true;
Mel Gormanc76562b2012-07-31 16:44:41 -07001339 return size<= sk->sk_forward_alloc ||
1340 __sk_mem_schedule(sk, size, SK_MEM_RECV) ||
1341 skb_pfmemalloc(skb);
Hideo Aoki3ab224b2007-12-31 00:11:19 -08001342}
1343
1344static inline void sk_mem_reclaim(struct sock *sk)
1345{
1346 if (!sk_has_account(sk))
1347 return;
1348 if (sk->sk_forward_alloc >= SK_MEM_QUANTUM)
1349 __sk_mem_reclaim(sk);
1350}
1351
David S. Miller9993e7d2008-01-10 21:56:38 -08001352static inline void sk_mem_reclaim_partial(struct sock *sk)
1353{
1354 if (!sk_has_account(sk))
1355 return;
1356 if (sk->sk_forward_alloc > SK_MEM_QUANTUM)
1357 __sk_mem_reclaim(sk);
1358}
1359
Hideo Aoki3ab224b2007-12-31 00:11:19 -08001360static inline void sk_mem_charge(struct sock *sk, int size)
1361{
1362 if (!sk_has_account(sk))
1363 return;
1364 sk->sk_forward_alloc -= size;
1365}
1366
1367static inline void sk_mem_uncharge(struct sock *sk, int size)
1368{
1369 if (!sk_has_account(sk))
1370 return;
1371 sk->sk_forward_alloc += size;
1372}
1373
1374static inline void sk_wmem_free_skb(struct sock *sk, struct sk_buff *skb)
1375{
Hideo Aoki3ab224b2007-12-31 00:11:19 -08001376 sock_set_flag(sk, SOCK_QUEUE_SHRUNK);
1377 sk->sk_wmem_queued -= skb->truesize;
1378 sk_mem_uncharge(sk, skb->truesize);
1379 __kfree_skb(skb);
Herbert Xud80d99d2005-09-01 17:48:23 -07001380}
1381
Linus Torvalds1da177e2005-04-16 15:20:36 -07001382/* Used by processes to "lock" a socket state, so that
1383 * interrupts and bottom half handlers won't change it
1384 * from under us. It essentially blocks any incoming
1385 * packets, so that we won't get any new data or any
1386 * packets that change the state of the socket.
1387 *
1388 * While locked, BH processing will add new packets to
1389 * the backlog queue. This queue is processed by the
1390 * owner of the socket lock right before it is released.
1391 *
1392 * Since ~2.3.5 it is also exclusive sleep lock serializing
1393 * accesses from user process context.
1394 */
John Heffnerd2e91172007-09-12 10:44:19 +02001395#define sock_owned_by_user(sk) ((sk)->sk_lock.owned)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001396
Peter Zijlstraed075362006-12-06 20:35:24 -08001397/*
1398 * Macro so as to not evaluate some arguments when
1399 * lockdep is not enabled.
1400 *
1401 * Mark both the sk_lock and the sk_lock.slock as a
1402 * per-address-family lock class.
1403 */
Eric Dumazetdc6b9b72012-05-16 22:48:15 +00001404#define sock_lock_init_class_and_name(sk, sname, skey, name, key) \
Peter Zijlstraed075362006-12-06 20:35:24 -08001405do { \
Ingo Molnare8f6fbf2008-11-12 01:38:36 +00001406 sk->sk_lock.owned = 0; \
Peter Zijlstraed075362006-12-06 20:35:24 -08001407 init_waitqueue_head(&sk->sk_lock.wq); \
1408 spin_lock_init(&(sk)->sk_lock.slock); \
1409 debug_check_no_locks_freed((void *)&(sk)->sk_lock, \
1410 sizeof((sk)->sk_lock)); \
1411 lockdep_set_class_and_name(&(sk)->sk_lock.slock, \
Eric Dumazetdc6b9b72012-05-16 22:48:15 +00001412 (skey), (sname)); \
Peter Zijlstraed075362006-12-06 20:35:24 -08001413 lockdep_init_map(&(sk)->sk_lock.dep_map, (name), (key), 0); \
1414} while (0)
1415
Harvey Harrison41380932007-12-12 10:46:51 -08001416extern void lock_sock_nested(struct sock *sk, int subclass);
Peter Zijlstrafcc70d52006-11-08 22:44:35 -08001417
1418static inline void lock_sock(struct sock *sk)
1419{
1420 lock_sock_nested(sk, 0);
1421}
1422
Harvey Harrison41380932007-12-12 10:46:51 -08001423extern void release_sock(struct sock *sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001424
1425/* BH context may only use the following locking interface. */
1426#define bh_lock_sock(__sk) spin_lock(&((__sk)->sk_lock.slock))
Ingo Molnarc6366182006-07-03 00:25:13 -07001427#define bh_lock_sock_nested(__sk) \
1428 spin_lock_nested(&((__sk)->sk_lock.slock), \
1429 SINGLE_DEPTH_NESTING)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001430#define bh_unlock_sock(__sk) spin_unlock(&((__sk)->sk_lock.slock))
1431
Eric Dumazet8a74ad62010-05-26 19:20:18 +00001432extern bool lock_sock_fast(struct sock *sk);
1433/**
1434 * unlock_sock_fast - complement of lock_sock_fast
1435 * @sk: socket
1436 * @slow: slow mode
1437 *
1438 * fast unlock socket for user context.
1439 * If slow mode is on, we call regular release_sock()
1440 */
1441static inline void unlock_sock_fast(struct sock *sk, bool slow)
Eric Dumazet4b0b72f2010-04-28 14:35:48 -07001442{
Eric Dumazet8a74ad62010-05-26 19:20:18 +00001443 if (slow)
1444 release_sock(sk);
1445 else
1446 spin_unlock_bh(&sk->sk_lock.slock);
Eric Dumazet4b0b72f2010-04-28 14:35:48 -07001447}
1448
Eric Dumazet4b0b72f2010-04-28 14:35:48 -07001449
Eric W. Biederman1b8d7ae2007-10-08 23:24:22 -07001450extern struct sock *sk_alloc(struct net *net, int family,
Al Virodd0fc662005-10-07 07:46:04 +01001451 gfp_t priority,
Pavel Emelyanov6257ff22007-11-01 00:39:31 -07001452 struct proto *prot);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001453extern void sk_free(struct sock *sk);
Denis V. Lunevedf02082008-02-29 11:18:32 -08001454extern void sk_release_kernel(struct sock *sk);
Eric Dumazete56c57d2011-11-08 17:07:07 -05001455extern struct sock *sk_clone_lock(const struct sock *sk,
1456 const gfp_t priority);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001457
1458extern struct sk_buff *sock_wmalloc(struct sock *sk,
1459 unsigned long size, int force,
Al Virodd0fc662005-10-07 07:46:04 +01001460 gfp_t priority);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001461extern struct sk_buff *sock_rmalloc(struct sock *sk,
1462 unsigned long size, int force,
Al Virodd0fc662005-10-07 07:46:04 +01001463 gfp_t priority);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001464extern void sock_wfree(struct sk_buff *skb);
1465extern void sock_rfree(struct sk_buff *skb);
David S. Miller41063e92012-06-19 21:22:05 -07001466extern void sock_edemux(struct sk_buff *skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001467
1468extern int sock_setsockopt(struct socket *sock, int level,
1469 int op, char __user *optval,
David S. Millerb7058842009-09-30 16:12:20 -07001470 unsigned int optlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001471
1472extern int sock_getsockopt(struct socket *sock, int level,
Eric Dumazetdc6b9b72012-05-16 22:48:15 +00001473 int op, char __user *optval,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001474 int __user *optlen);
Eric Dumazetdc6b9b72012-05-16 22:48:15 +00001475extern struct sk_buff *sock_alloc_send_skb(struct sock *sk,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001476 unsigned long size,
1477 int noblock,
1478 int *errcode);
Eric Dumazetdc6b9b72012-05-16 22:48:15 +00001479extern struct sk_buff *sock_alloc_send_pskb(struct sock *sk,
Herbert Xu4cc7f682009-02-04 16:55:54 -08001480 unsigned long header_len,
1481 unsigned long data_len,
1482 int noblock,
1483 int *errcode);
Victor Fusco86a76ca2005-07-08 14:57:47 -07001484extern void *sock_kmalloc(struct sock *sk, int size,
Al Virodd0fc662005-10-07 07:46:04 +01001485 gfp_t priority);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001486extern void sock_kfree_s(struct sock *sk, void *mem, int size);
1487extern void sk_send_sigurg(struct sock *sk);
1488
Herbert Xuf8451722010-05-24 00:12:34 -07001489#ifdef CONFIG_CGROUPS
1490extern void sock_update_classid(struct sock *sk);
1491#else
1492static inline void sock_update_classid(struct sock *sk)
1493{
1494}
1495#endif
1496
Linus Torvalds1da177e2005-04-16 15:20:36 -07001497/*
1498 * Functions to fill in entries in struct proto_ops when a protocol
1499 * does not implement a particular function.
1500 */
Eric Dumazetdc6b9b72012-05-16 22:48:15 +00001501extern int sock_no_bind(struct socket *,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001502 struct sockaddr *, int);
1503extern int sock_no_connect(struct socket *,
1504 struct sockaddr *, int, int);
1505extern int sock_no_socketpair(struct socket *,
1506 struct socket *);
1507extern int sock_no_accept(struct socket *,
1508 struct socket *, int);
1509extern int sock_no_getname(struct socket *,
1510 struct sockaddr *, int *, int);
1511extern unsigned int sock_no_poll(struct file *, struct socket *,
1512 struct poll_table_struct *);
1513extern int sock_no_ioctl(struct socket *, unsigned int,
1514 unsigned long);
1515extern int sock_no_listen(struct socket *, int);
1516extern int sock_no_shutdown(struct socket *, int);
1517extern int sock_no_getsockopt(struct socket *, int , int,
1518 char __user *, int __user *);
1519extern int sock_no_setsockopt(struct socket *, int, int,
David S. Millerb7058842009-09-30 16:12:20 -07001520 char __user *, unsigned int);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001521extern int sock_no_sendmsg(struct kiocb *, struct socket *,
1522 struct msghdr *, size_t);
1523extern int sock_no_recvmsg(struct kiocb *, struct socket *,
1524 struct msghdr *, size_t, int);
1525extern int sock_no_mmap(struct file *file,
1526 struct socket *sock,
1527 struct vm_area_struct *vma);
1528extern ssize_t sock_no_sendpage(struct socket *sock,
1529 struct page *page,
Eric Dumazetdc6b9b72012-05-16 22:48:15 +00001530 int offset, size_t size,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001531 int flags);
1532
1533/*
1534 * Functions to fill in entries in struct proto_ops when a protocol
1535 * uses the inet style.
1536 */
1537extern int sock_common_getsockopt(struct socket *sock, int level, int optname,
1538 char __user *optval, int __user *optlen);
1539extern int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock,
1540 struct msghdr *msg, size_t size, int flags);
1541extern int sock_common_setsockopt(struct socket *sock, int level, int optname,
David S. Millerb7058842009-09-30 16:12:20 -07001542 char __user *optval, unsigned int optlen);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001543extern int compat_sock_common_getsockopt(struct socket *sock, int level,
1544 int optname, char __user *optval, int __user *optlen);
1545extern int compat_sock_common_setsockopt(struct socket *sock, int level,
David S. Millerb7058842009-09-30 16:12:20 -07001546 int optname, char __user *optval, unsigned int optlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001547
1548extern void sk_common_release(struct sock *sk);
1549
1550/*
1551 * Default socket callbacks and setup code
1552 */
Eric Dumazetdc6b9b72012-05-16 22:48:15 +00001553
Linus Torvalds1da177e2005-04-16 15:20:36 -07001554/* Initialise core socket variables */
1555extern void sock_init_data(struct socket *sock, struct sock *sk);
1556
Eric Dumazet46bcf142010-12-06 09:29:43 -08001557extern void sk_filter_release_rcu(struct rcu_head *rcu);
1558
Linus Torvalds1da177e2005-04-16 15:20:36 -07001559/**
Ben Hutchings1a5778a2010-02-14 22:35:47 -08001560 * sk_filter_release - release a socket filter
Paul Bonserdc9b3342006-11-23 17:56:13 -08001561 * @fp: filter to remove
1562 *
1563 * Remove a filter from a socket and release its resources.
1564 */
1565
Pavel Emelyanov309dd5f2007-10-17 21:21:51 -07001566static inline void sk_filter_release(struct sk_filter *fp)
1567{
1568 if (atomic_dec_and_test(&fp->refcnt))
Eric Dumazet80f8f102011-01-18 07:46:52 +00001569 call_rcu(&fp->rcu, sk_filter_release_rcu);
Pavel Emelyanov309dd5f2007-10-17 21:21:51 -07001570}
1571
1572static inline void sk_filter_uncharge(struct sock *sk, struct sk_filter *fp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001573{
1574 unsigned int size = sk_filter_len(fp);
1575
1576 atomic_sub(size, &sk->sk_omem_alloc);
Pavel Emelyanov309dd5f2007-10-17 21:21:51 -07001577 sk_filter_release(fp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001578}
1579
1580static inline void sk_filter_charge(struct sock *sk, struct sk_filter *fp)
1581{
1582 atomic_inc(&fp->refcnt);
1583 atomic_add(sk_filter_len(fp), &sk->sk_omem_alloc);
1584}
1585
1586/*
1587 * Socket reference counting postulates.
1588 *
1589 * * Each user of socket SHOULD hold a reference count.
1590 * * Each access point to socket (an hash table bucket, reference from a list,
1591 * running timer, skb in flight MUST hold a reference count.
1592 * * When reference count hits 0, it means it will never increase back.
1593 * * When reference count hits 0, it means that no references from
1594 * outside exist to this socket and current process on current CPU
1595 * is last user and may/should destroy this socket.
1596 * * sk_free is called from any context: process, BH, IRQ. When
1597 * it is called, socket has no references from outside -> sk_free
1598 * may release descendant resources allocated by the socket, but
1599 * to the time when it is called, socket is NOT referenced by any
1600 * hash tables, lists etc.
1601 * * Packets, delivered from outside (from network or from another process)
1602 * and enqueued on receive/error queues SHOULD NOT grab reference count,
1603 * when they sit in queue. Otherwise, packets will leak to hole, when
1604 * socket is looked up by one cpu and unhasing is made by another CPU.
1605 * It is true for udp/raw, netlink (leak to receive and error queues), tcp
1606 * (leak to backlog). Packet socket does all the processing inside
1607 * BR_NETPROTO_LOCK, so that it has not this race condition. UNIX sockets
1608 * use separate SMP lock, so that they are prone too.
1609 */
1610
1611/* Ungrab socket and destroy it, if it was the last reference. */
1612static inline void sock_put(struct sock *sk)
1613{
1614 if (atomic_dec_and_test(&sk->sk_refcnt))
1615 sk_free(sk);
1616}
1617
Arnaldo Carvalho de Melo58a5a7b2006-11-16 14:06:06 -02001618extern int sk_receive_skb(struct sock *sk, struct sk_buff *skb,
1619 const int nested);
Arnaldo Carvalho de Melo25995ff2005-12-27 02:42:22 -02001620
Krishna Kumare022f0b2009-10-19 23:46:20 +00001621static inline void sk_tx_queue_set(struct sock *sk, int tx_queue)
1622{
1623 sk->sk_tx_queue_mapping = tx_queue;
1624}
1625
1626static inline void sk_tx_queue_clear(struct sock *sk)
1627{
1628 sk->sk_tx_queue_mapping = -1;
1629}
1630
1631static inline int sk_tx_queue_get(const struct sock *sk)
1632{
Tom Herbertb0f77d02010-07-14 20:50:29 -07001633 return sk ? sk->sk_tx_queue_mapping : -1;
Krishna Kumare022f0b2009-10-19 23:46:20 +00001634}
1635
David S. Miller972692e2008-06-17 22:41:38 -07001636static inline void sk_set_socket(struct sock *sk, struct socket *sock)
1637{
Krishna Kumare022f0b2009-10-19 23:46:20 +00001638 sk_tx_queue_clear(sk);
David S. Miller972692e2008-06-17 22:41:38 -07001639 sk->sk_socket = sock;
1640}
1641
Eric Dumazetaa395142010-04-20 13:03:51 +00001642static inline wait_queue_head_t *sk_sleep(struct sock *sk)
1643{
Eric Dumazeteaefd112011-02-18 03:26:36 +00001644 BUILD_BUG_ON(offsetof(struct socket_wq, wait) != 0);
1645 return &rcu_dereference_raw(sk->sk_wq)->wait;
Eric Dumazetaa395142010-04-20 13:03:51 +00001646}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001647/* Detach socket from process context.
1648 * Announce socket dead, detach it from wait queue and inode.
1649 * Note that parent inode held reference count on this struct sock,
1650 * we do not release it in this function, because protocol
1651 * probably wants some additional cleanups or even continuing
1652 * to work with this socket (TCP).
1653 */
1654static inline void sock_orphan(struct sock *sk)
1655{
1656 write_lock_bh(&sk->sk_callback_lock);
1657 sock_set_flag(sk, SOCK_DEAD);
David S. Miller972692e2008-06-17 22:41:38 -07001658 sk_set_socket(sk, NULL);
Eric Dumazet43815482010-04-29 11:01:49 +00001659 sk->sk_wq = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001660 write_unlock_bh(&sk->sk_callback_lock);
1661}
1662
1663static inline void sock_graft(struct sock *sk, struct socket *parent)
1664{
1665 write_lock_bh(&sk->sk_callback_lock);
Eric Dumazeteaefd112011-02-18 03:26:36 +00001666 sk->sk_wq = parent->wq;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001667 parent->sk = sk;
David S. Miller972692e2008-06-17 22:41:38 -07001668 sk_set_socket(sk, parent);
Venkat Yekkirala4237c752006-07-24 23:32:50 -07001669 security_sock_graft(sk, parent);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001670 write_unlock_bh(&sk->sk_callback_lock);
1671}
1672
1673extern int sock_i_uid(struct sock *sk);
1674extern unsigned long sock_i_ino(struct sock *sk);
1675
1676static inline struct dst_entry *
1677__sk_dst_get(struct sock *sk)
1678{
Michal Hockod8bf4ca2011-07-08 14:39:41 +02001679 return rcu_dereference_check(sk->sk_dst_cache, sock_owned_by_user(sk) ||
Eric Dumazetf68c2242010-04-22 16:06:59 -07001680 lockdep_is_held(&sk->sk_lock.slock));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001681}
1682
1683static inline struct dst_entry *
1684sk_dst_get(struct sock *sk)
1685{
1686 struct dst_entry *dst;
1687
Eric Dumazetb6c67122010-04-08 23:03:29 +00001688 rcu_read_lock();
1689 dst = rcu_dereference(sk->sk_dst_cache);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001690 if (dst)
1691 dst_hold(dst);
Eric Dumazetb6c67122010-04-08 23:03:29 +00001692 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001693 return dst;
1694}
1695
Eric Dumazetb6c67122010-04-08 23:03:29 +00001696extern void sk_reset_txq(struct sock *sk);
1697
1698static inline void dst_negative_advice(struct sock *sk)
1699{
1700 struct dst_entry *ndst, *dst = __sk_dst_get(sk);
1701
1702 if (dst && dst->ops->negative_advice) {
1703 ndst = dst->ops->negative_advice(dst);
1704
1705 if (ndst != dst) {
1706 rcu_assign_pointer(sk->sk_dst_cache, ndst);
1707 sk_reset_txq(sk);
1708 }
1709 }
1710}
1711
Linus Torvalds1da177e2005-04-16 15:20:36 -07001712static inline void
1713__sk_dst_set(struct sock *sk, struct dst_entry *dst)
1714{
1715 struct dst_entry *old_dst;
1716
Krishna Kumare022f0b2009-10-19 23:46:20 +00001717 sk_tx_queue_clear(sk);
Eric Dumazet0b53ff22010-04-26 20:40:43 +00001718 /*
1719 * This can be called while sk is owned by the caller only,
1720 * with no state that can be checked in a rcu_dereference_check() cond
1721 */
1722 old_dst = rcu_dereference_raw(sk->sk_dst_cache);
Eric Dumazetb6c67122010-04-08 23:03:29 +00001723 rcu_assign_pointer(sk->sk_dst_cache, dst);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001724 dst_release(old_dst);
1725}
1726
1727static inline void
1728sk_dst_set(struct sock *sk, struct dst_entry *dst)
1729{
Eric Dumazetb6c67122010-04-08 23:03:29 +00001730 spin_lock(&sk->sk_dst_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001731 __sk_dst_set(sk, dst);
Eric Dumazetb6c67122010-04-08 23:03:29 +00001732 spin_unlock(&sk->sk_dst_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001733}
1734
1735static inline void
1736__sk_dst_reset(struct sock *sk)
1737{
Eric Dumazetb6c67122010-04-08 23:03:29 +00001738 __sk_dst_set(sk, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001739}
1740
1741static inline void
1742sk_dst_reset(struct sock *sk)
1743{
Eric Dumazetb6c67122010-04-08 23:03:29 +00001744 spin_lock(&sk->sk_dst_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001745 __sk_dst_reset(sk);
Eric Dumazetb6c67122010-04-08 23:03:29 +00001746 spin_unlock(&sk->sk_dst_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001747}
1748
Denis Vlasenkof0088a52006-03-28 01:08:21 -08001749extern struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001750
Denis Vlasenkof0088a52006-03-28 01:08:21 -08001751extern struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001752
Eric Dumazetdc6b9b72012-05-16 22:48:15 +00001753static inline bool sk_can_gso(const struct sock *sk)
Herbert Xubcd76112006-06-30 13:36:35 -07001754{
1755 return net_gso_ok(sk->sk_route_caps, sk->sk_gso_type);
1756}
1757
Andi Kleen99580892007-04-20 17:12:43 -07001758extern void sk_setup_caps(struct sock *sk, struct dst_entry *dst);
Arnaldo Carvalho de Melo6cbb0df2005-08-09 19:49:02 -07001759
Michał Mirosławc8f44af2011-11-15 15:29:55 +00001760static inline void sk_nocaps_add(struct sock *sk, netdev_features_t flags)
Eric Dumazeta4654192010-05-16 00:36:33 -07001761{
1762 sk->sk_route_nocaps |= flags;
1763 sk->sk_route_caps &= ~flags;
1764}
1765
Tom Herbertc6e1a0d2011-04-04 22:30:30 -07001766static inline int skb_do_copy_data_nocache(struct sock *sk, struct sk_buff *skb,
1767 char __user *from, char *to,
Wei Yongjun912d3982011-04-06 18:40:12 +00001768 int copy, int offset)
Tom Herbertc6e1a0d2011-04-04 22:30:30 -07001769{
1770 if (skb->ip_summed == CHECKSUM_NONE) {
1771 int err = 0;
1772 __wsum csum = csum_and_copy_from_user(from, to, copy, 0, &err);
1773 if (err)
1774 return err;
Wei Yongjun912d3982011-04-06 18:40:12 +00001775 skb->csum = csum_block_add(skb->csum, csum, offset);
Tom Herbertc6e1a0d2011-04-04 22:30:30 -07001776 } else if (sk->sk_route_caps & NETIF_F_NOCACHE_COPY) {
1777 if (!access_ok(VERIFY_READ, from, copy) ||
1778 __copy_from_user_nocache(to, from, copy))
1779 return -EFAULT;
1780 } else if (copy_from_user(to, from, copy))
1781 return -EFAULT;
1782
1783 return 0;
1784}
1785
1786static inline int skb_add_data_nocache(struct sock *sk, struct sk_buff *skb,
1787 char __user *from, int copy)
1788{
Wei Yongjun912d3982011-04-06 18:40:12 +00001789 int err, offset = skb->len;
Tom Herbertc6e1a0d2011-04-04 22:30:30 -07001790
Wei Yongjun912d3982011-04-06 18:40:12 +00001791 err = skb_do_copy_data_nocache(sk, skb, from, skb_put(skb, copy),
1792 copy, offset);
Tom Herbertc6e1a0d2011-04-04 22:30:30 -07001793 if (err)
Wei Yongjun912d3982011-04-06 18:40:12 +00001794 __skb_trim(skb, offset);
Tom Herbertc6e1a0d2011-04-04 22:30:30 -07001795
1796 return err;
1797}
1798
1799static inline int skb_copy_to_page_nocache(struct sock *sk, char __user *from,
1800 struct sk_buff *skb,
1801 struct page *page,
1802 int off, int copy)
1803{
1804 int err;
1805
Wei Yongjun912d3982011-04-06 18:40:12 +00001806 err = skb_do_copy_data_nocache(sk, skb, from, page_address(page) + off,
1807 copy, skb->len);
Tom Herbertc6e1a0d2011-04-04 22:30:30 -07001808 if (err)
1809 return err;
1810
1811 skb->len += copy;
1812 skb->data_len += copy;
1813 skb->truesize += copy;
1814 sk->sk_wmem_queued += copy;
1815 sk_mem_charge(sk, copy);
1816 return 0;
1817}
1818
Linus Torvalds1da177e2005-04-16 15:20:36 -07001819static inline int skb_copy_to_page(struct sock *sk, char __user *from,
1820 struct sk_buff *skb, struct page *page,
1821 int off, int copy)
1822{
1823 if (skb->ip_summed == CHECKSUM_NONE) {
1824 int err = 0;
Al Viro50842052006-11-14 21:36:34 -08001825 __wsum csum = csum_and_copy_from_user(from,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001826 page_address(page) + off,
1827 copy, 0, &err);
1828 if (err)
1829 return err;
1830 skb->csum = csum_block_add(skb->csum, csum, skb->len);
1831 } else if (copy_from_user(page_address(page) + off, from, copy))
1832 return -EFAULT;
1833
1834 skb->len += copy;
1835 skb->data_len += copy;
1836 skb->truesize += copy;
1837 sk->sk_wmem_queued += copy;
Hideo Aoki3ab224b2007-12-31 00:11:19 -08001838 sk_mem_charge(sk, copy);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001839 return 0;
1840}
1841
Eric Dumazetc5640392009-06-16 10:12:03 +00001842/**
1843 * sk_wmem_alloc_get - returns write allocations
1844 * @sk: socket
1845 *
1846 * Returns sk_wmem_alloc minus initial offset of one
1847 */
1848static inline int sk_wmem_alloc_get(const struct sock *sk)
1849{
1850 return atomic_read(&sk->sk_wmem_alloc) - 1;
1851}
1852
1853/**
1854 * sk_rmem_alloc_get - returns read allocations
1855 * @sk: socket
1856 *
1857 * Returns sk_rmem_alloc
1858 */
1859static inline int sk_rmem_alloc_get(const struct sock *sk)
1860{
1861 return atomic_read(&sk->sk_rmem_alloc);
1862}
1863
1864/**
1865 * sk_has_allocations - check if allocations are outstanding
1866 * @sk: socket
1867 *
1868 * Returns true if socket has write or read allocations
1869 */
Eric Dumazetdc6b9b72012-05-16 22:48:15 +00001870static inline bool sk_has_allocations(const struct sock *sk)
Eric Dumazetc5640392009-06-16 10:12:03 +00001871{
1872 return sk_wmem_alloc_get(sk) || sk_rmem_alloc_get(sk);
1873}
1874
Jiri Olsaa57de0b2009-07-08 12:09:13 +00001875/**
Eric Dumazet43815482010-04-29 11:01:49 +00001876 * wq_has_sleeper - check if there are any waiting processes
Randy Dunlapacfbe962010-05-24 23:54:18 -07001877 * @wq: struct socket_wq
Jiri Olsaa57de0b2009-07-08 12:09:13 +00001878 *
Eric Dumazet43815482010-04-29 11:01:49 +00001879 * Returns true if socket_wq has waiting processes
Jiri Olsaa57de0b2009-07-08 12:09:13 +00001880 *
Eric Dumazet43815482010-04-29 11:01:49 +00001881 * The purpose of the wq_has_sleeper and sock_poll_wait is to wrap the memory
Jiri Olsaa57de0b2009-07-08 12:09:13 +00001882 * barrier call. They were added due to the race found within the tcp code.
1883 *
1884 * Consider following tcp code paths:
1885 *
1886 * CPU1 CPU2
1887 *
1888 * sys_select receive packet
1889 * ... ...
1890 * __add_wait_queue update tp->rcv_nxt
1891 * ... ...
1892 * tp->rcv_nxt check sock_def_readable
1893 * ... {
Eric Dumazet43815482010-04-29 11:01:49 +00001894 * schedule rcu_read_lock();
1895 * wq = rcu_dereference(sk->sk_wq);
1896 * if (wq && waitqueue_active(&wq->wait))
1897 * wake_up_interruptible(&wq->wait)
Jiri Olsaa57de0b2009-07-08 12:09:13 +00001898 * ...
1899 * }
1900 *
1901 * The race for tcp fires when the __add_wait_queue changes done by CPU1 stay
1902 * in its cache, and so does the tp->rcv_nxt update on CPU2 side. The CPU1
1903 * could then endup calling schedule and sleep forever if there are no more
1904 * data on the socket.
Jiri Olsaad462762009-07-08 12:10:31 +00001905 *
Jiri Olsaa57de0b2009-07-08 12:09:13 +00001906 */
Eric Dumazet43815482010-04-29 11:01:49 +00001907static inline bool wq_has_sleeper(struct socket_wq *wq)
Jiri Olsaa57de0b2009-07-08 12:09:13 +00001908{
Eric Dumazetdc6b9b72012-05-16 22:48:15 +00001909 /* We need to be sure we are in sync with the
Jiri Olsaa57de0b2009-07-08 12:09:13 +00001910 * add_wait_queue modifications to the wait queue.
1911 *
1912 * This memory barrier is paired in the sock_poll_wait.
1913 */
Eric Dumazet43815482010-04-29 11:01:49 +00001914 smp_mb();
1915 return wq && waitqueue_active(&wq->wait);
Jiri Olsaa57de0b2009-07-08 12:09:13 +00001916}
1917
1918/**
1919 * sock_poll_wait - place memory barrier behind the poll_wait call.
1920 * @filp: file
1921 * @wait_address: socket wait queue
1922 * @p: poll_table
1923 *
Eric Dumazet43815482010-04-29 11:01:49 +00001924 * See the comments in the wq_has_sleeper function.
Jiri Olsaa57de0b2009-07-08 12:09:13 +00001925 */
1926static inline void sock_poll_wait(struct file *filp,
1927 wait_queue_head_t *wait_address, poll_table *p)
1928{
Hans Verkuil626cf232012-03-23 15:02:27 -07001929 if (!poll_does_not_wait(p) && wait_address) {
Jiri Olsaa57de0b2009-07-08 12:09:13 +00001930 poll_wait(filp, wait_address, p);
Eric Dumazetdc6b9b72012-05-16 22:48:15 +00001931 /* We need to be sure we are in sync with the
Jiri Olsaa57de0b2009-07-08 12:09:13 +00001932 * socket flags modification.
1933 *
Eric Dumazet43815482010-04-29 11:01:49 +00001934 * This memory barrier is paired in the wq_has_sleeper.
Eric Dumazetdc6b9b72012-05-16 22:48:15 +00001935 */
Jiri Olsaa57de0b2009-07-08 12:09:13 +00001936 smp_mb();
1937 }
1938}
1939
Linus Torvalds1da177e2005-04-16 15:20:36 -07001940/*
Eric Dumazetdc6b9b72012-05-16 22:48:15 +00001941 * Queue a received datagram if it will fit. Stream and sequenced
Linus Torvalds1da177e2005-04-16 15:20:36 -07001942 * protocols can't normally use this as they need to fit buffers in
1943 * and play with them.
1944 *
Eric Dumazetdc6b9b72012-05-16 22:48:15 +00001945 * Inlined as it's very short and called for pretty much every
Linus Torvalds1da177e2005-04-16 15:20:36 -07001946 * packet ever received.
1947 */
1948
1949static inline void skb_set_owner_w(struct sk_buff *skb, struct sock *sk)
1950{
Herbert Xud55d87f2009-06-22 02:25:25 +00001951 skb_orphan(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001952 skb->sk = sk;
1953 skb->destructor = sock_wfree;
Eric Dumazet2b85a342009-06-11 02:55:43 -07001954 /*
1955 * We used to take a refcount on sk, but following operation
1956 * is enough to guarantee sk_free() wont free this sock until
1957 * all in-flight packets are completed
1958 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001959 atomic_add(skb->truesize, &sk->sk_wmem_alloc);
1960}
1961
1962static inline void skb_set_owner_r(struct sk_buff *skb, struct sock *sk)
1963{
Herbert Xud55d87f2009-06-22 02:25:25 +00001964 skb_orphan(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001965 skb->sk = sk;
1966 skb->destructor = sock_rfree;
1967 atomic_add(skb->truesize, &sk->sk_rmem_alloc);
Hideo Aoki3ab224b2007-12-31 00:11:19 -08001968 sk_mem_charge(sk, skb->truesize);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001969}
1970
Eric Dumazetdc6b9b72012-05-16 22:48:15 +00001971extern void sk_reset_timer(struct sock *sk, struct timer_list *timer,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001972 unsigned long expires);
1973
Eric Dumazetdc6b9b72012-05-16 22:48:15 +00001974extern void sk_stop_timer(struct sock *sk, struct timer_list *timer);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001975
Denis Vlasenkof0088a52006-03-28 01:08:21 -08001976extern int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001977
Eric Dumazetb1faf562010-05-31 23:44:05 -07001978extern int sock_queue_err_skb(struct sock *sk, struct sk_buff *skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001979
1980/*
1981 * Recover an error report and clear atomically
1982 */
Eric Dumazetdc6b9b72012-05-16 22:48:15 +00001983
Linus Torvalds1da177e2005-04-16 15:20:36 -07001984static inline int sock_error(struct sock *sk)
1985{
Benjamin LaHaisec1cbe4b2005-12-13 23:22:19 -08001986 int err;
1987 if (likely(!sk->sk_err))
1988 return 0;
1989 err = xchg(&sk->sk_err, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001990 return -err;
1991}
1992
1993static inline unsigned long sock_wspace(struct sock *sk)
1994{
1995 int amt = 0;
1996
1997 if (!(sk->sk_shutdown & SEND_SHUTDOWN)) {
1998 amt = sk->sk_sndbuf - atomic_read(&sk->sk_wmem_alloc);
Eric Dumazetdc6b9b72012-05-16 22:48:15 +00001999 if (amt < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002000 amt = 0;
2001 }
2002 return amt;
2003}
2004
2005static inline void sk_wake_async(struct sock *sk, int how, int band)
2006{
Eric Dumazetbcdce712009-10-06 17:28:29 -07002007 if (sock_flag(sk, SOCK_FASYNC))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002008 sock_wake_async(sk->sk_socket, how, band);
2009}
2010
2011#define SOCK_MIN_SNDBUF 2048
Eric Dumazet7a91b4342010-09-26 18:53:07 -07002012/*
2013 * Since sk_rmem_alloc sums skb->truesize, even a small frame might need
2014 * sizeof(sk_buff) + MTU + padding, unless net driver perform copybreak
2015 */
2016#define SOCK_MIN_RCVBUF (2048 + sizeof(struct sk_buff))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002017
2018static inline void sk_stream_moderate_sndbuf(struct sock *sk)
2019{
2020 if (!(sk->sk_userlocks & SOCK_SNDBUF_LOCK)) {
Eric Dumazet8df09ea2007-12-21 03:07:41 -08002021 sk->sk_sndbuf = min(sk->sk_sndbuf, sk->sk_wmem_queued >> 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002022 sk->sk_sndbuf = max(sk->sk_sndbuf, SOCK_MIN_SNDBUF);
2023 }
2024}
2025
Pavel Emelyanovdf97c702007-11-29 21:22:33 +11002026struct sk_buff *sk_stream_alloc_skb(struct sock *sk, int size, gfp_t gfp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002027
2028static inline struct page *sk_stream_alloc_page(struct sock *sk)
2029{
2030 struct page *page = NULL;
2031
Herbert Xuef015782005-09-01 17:48:59 -07002032 page = alloc_pages(sk->sk_allocation, 0);
2033 if (!page) {
Glauber Costa180d8cd2011-12-11 21:47:02 +00002034 sk_enter_memory_pressure(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002035 sk_stream_moderate_sndbuf(sk);
2036 }
2037 return page;
2038}
2039
Linus Torvalds1da177e2005-04-16 15:20:36 -07002040/*
2041 * Default write policy as shown to user space via poll/select/SIGIO
2042 */
Eric Dumazetdc6b9b72012-05-16 22:48:15 +00002043static inline bool sock_writeable(const struct sock *sk)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002044{
Eric Dumazet8df09ea2007-12-21 03:07:41 -08002045 return atomic_read(&sk->sk_wmem_alloc) < (sk->sk_sndbuf >> 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002046}
2047
Al Virodd0fc662005-10-07 07:46:04 +01002048static inline gfp_t gfp_any(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002049{
Andrew Morton99709372009-02-12 16:43:17 -08002050 return in_softirq() ? GFP_ATOMIC : GFP_KERNEL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002051}
2052
Eric Dumazetdc6b9b72012-05-16 22:48:15 +00002053static inline long sock_rcvtimeo(const struct sock *sk, bool noblock)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002054{
2055 return noblock ? 0 : sk->sk_rcvtimeo;
2056}
2057
Eric Dumazetdc6b9b72012-05-16 22:48:15 +00002058static inline long sock_sndtimeo(const struct sock *sk, bool noblock)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002059{
2060 return noblock ? 0 : sk->sk_sndtimeo;
2061}
2062
2063static inline int sock_rcvlowat(const struct sock *sk, int waitall, int len)
2064{
2065 return (waitall ? len : min_t(int, sk->sk_rcvlowat, len)) ? : 1;
2066}
2067
2068/* Alas, with timeout socket operations are not restartable.
2069 * Compare this to poll().
2070 */
2071static inline int sock_intr_errno(long timeo)
2072{
2073 return timeo == MAX_SCHEDULE_TIMEOUT ? -ERESTARTSYS : -EINTR;
2074}
2075
Eric Dumazet92f37fd2007-03-25 22:14:49 -07002076extern void __sock_recv_timestamp(struct msghdr *msg, struct sock *sk,
2077 struct sk_buff *skb);
Johannes Berg6e3e9392011-11-09 10:15:42 +01002078extern void __sock_recv_wifi_status(struct msghdr *msg, struct sock *sk,
2079 struct sk_buff *skb);
Eric Dumazet92f37fd2007-03-25 22:14:49 -07002080
Eric Dumazetdc6b9b72012-05-16 22:48:15 +00002081static inline void
Linus Torvalds1da177e2005-04-16 15:20:36 -07002082sock_recv_timestamp(struct msghdr *msg, struct sock *sk, struct sk_buff *skb)
2083{
Eric Dumazetb7aa0bf2007-04-19 16:16:32 -07002084 ktime_t kt = skb->tstamp;
Patrick Ohly20d49472009-02-12 05:03:38 +00002085 struct skb_shared_hwtstamps *hwtstamps = skb_hwtstamps(skb);
Patrick McHardya61bbcf2005-08-14 17:24:31 -07002086
Patrick Ohly20d49472009-02-12 05:03:38 +00002087 /*
2088 * generate control messages if
2089 * - receive time stamping in software requested (SOCK_RCVTSTAMP
2090 * or SOCK_TIMESTAMPING_RX_SOFTWARE)
2091 * - software time stamp available and wanted
2092 * (SOCK_TIMESTAMPING_SOFTWARE)
2093 * - hardware time stamps available and wanted
2094 * (SOCK_TIMESTAMPING_SYS_HARDWARE or
2095 * SOCK_TIMESTAMPING_RAW_HARDWARE)
2096 */
2097 if (sock_flag(sk, SOCK_RCVTSTAMP) ||
2098 sock_flag(sk, SOCK_TIMESTAMPING_RX_SOFTWARE) ||
2099 (kt.tv64 && sock_flag(sk, SOCK_TIMESTAMPING_SOFTWARE)) ||
2100 (hwtstamps->hwtstamp.tv64 &&
2101 sock_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE)) ||
2102 (hwtstamps->syststamp.tv64 &&
2103 sock_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE)))
Eric Dumazet92f37fd2007-03-25 22:14:49 -07002104 __sock_recv_timestamp(msg, sk, skb);
2105 else
Eric Dumazetb7aa0bf2007-04-19 16:16:32 -07002106 sk->sk_stamp = kt;
Johannes Berg6e3e9392011-11-09 10:15:42 +01002107
2108 if (sock_flag(sk, SOCK_WIFI_STATUS) && skb->wifi_acked_valid)
2109 __sock_recv_wifi_status(msg, sk, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002110}
2111
Eric Dumazet767dd032010-04-28 19:14:43 +00002112extern void __sock_recv_ts_and_drops(struct msghdr *msg, struct sock *sk,
2113 struct sk_buff *skb);
2114
2115static inline void sock_recv_ts_and_drops(struct msghdr *msg, struct sock *sk,
2116 struct sk_buff *skb)
2117{
2118#define FLAGS_TS_OR_DROPS ((1UL << SOCK_RXQ_OVFL) | \
2119 (1UL << SOCK_RCVTSTAMP) | \
2120 (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE) | \
2121 (1UL << SOCK_TIMESTAMPING_SOFTWARE) | \
Eric Dumazetdc6b9b72012-05-16 22:48:15 +00002122 (1UL << SOCK_TIMESTAMPING_RAW_HARDWARE) | \
Eric Dumazet767dd032010-04-28 19:14:43 +00002123 (1UL << SOCK_TIMESTAMPING_SYS_HARDWARE))
2124
2125 if (sk->sk_flags & FLAGS_TS_OR_DROPS)
2126 __sock_recv_ts_and_drops(msg, sk, skb);
2127 else
2128 sk->sk_stamp = skb->tstamp;
2129}
Neil Horman3b885782009-10-12 13:26:31 -07002130
Linus Torvalds1da177e2005-04-16 15:20:36 -07002131/**
Patrick Ohly20d49472009-02-12 05:03:38 +00002132 * sock_tx_timestamp - checks whether the outgoing packet is to be time stamped
Patrick Ohly20d49472009-02-12 05:03:38 +00002133 * @sk: socket sending this packet
Oliver Hartkopp2244d072010-08-17 08:59:14 +00002134 * @tx_flags: filled with instructions for time stamping
Patrick Ohly20d49472009-02-12 05:03:38 +00002135 *
2136 * Currently only depends on SOCK_TIMESTAMPING* flags. Returns error code if
2137 * parameters are invalid.
2138 */
Oliver Hartkopp2244d072010-08-17 08:59:14 +00002139extern int sock_tx_timestamp(struct sock *sk, __u8 *tx_flags);
Patrick Ohly20d49472009-02-12 05:03:38 +00002140
2141/**
Linus Torvalds1da177e2005-04-16 15:20:36 -07002142 * sk_eat_skb - Release a skb if it is no longer needed
Pavel Pisa4dc3b162005-05-01 08:59:25 -07002143 * @sk: socket to eat this skb from
2144 * @skb: socket buffer to eat
Randy Dunlapf4b8ea72006-06-22 16:00:11 -07002145 * @copied_early: flag indicating whether DMA operations copied this data early
Linus Torvalds1da177e2005-04-16 15:20:36 -07002146 *
2147 * This routine must be called with interrupts disabled or with the socket
2148 * locked so that the sk_buff queue operation is ok.
2149*/
Chris Leech624d1162006-05-23 18:01:28 -07002150#ifdef CONFIG_NET_DMA
Eric Dumazetdc6b9b72012-05-16 22:48:15 +00002151static inline void sk_eat_skb(struct sock *sk, struct sk_buff *skb, bool copied_early)
Chris Leech624d1162006-05-23 18:01:28 -07002152{
2153 __skb_unlink(skb, &sk->sk_receive_queue);
2154 if (!copied_early)
2155 __kfree_skb(skb);
2156 else
2157 __skb_queue_tail(&sk->sk_async_wait_queue, skb);
2158}
2159#else
Eric Dumazetdc6b9b72012-05-16 22:48:15 +00002160static inline void sk_eat_skb(struct sock *sk, struct sk_buff *skb, bool copied_early)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002161{
2162 __skb_unlink(skb, &sk->sk_receive_queue);
2163 __kfree_skb(skb);
2164}
Chris Leech624d1162006-05-23 18:01:28 -07002165#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07002166
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +09002167static inline
2168struct net *sock_net(const struct sock *sk)
2169{
Eric Dumazetc2d9ba92010-06-01 06:51:19 +00002170 return read_pnet(&sk->sk_net);
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +09002171}
2172
2173static inline
Denis V. Lunevf5aa23f2008-03-26 00:48:17 -07002174void sock_net_set(struct sock *sk, struct net *net)
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +09002175{
Eric Dumazetc2d9ba92010-06-01 06:51:19 +00002176 write_pnet(&sk->sk_net, net);
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +09002177}
2178
Denis V. Lunevedf02082008-02-29 11:18:32 -08002179/*
2180 * Kernel sockets, f.e. rtnl or icmp_socket, are a part of a namespace.
Lucas De Marchi25985ed2011-03-30 22:57:33 -03002181 * They should not hold a reference to a namespace in order to allow
Denis V. Lunevedf02082008-02-29 11:18:32 -08002182 * to stop it.
2183 * Sockets after sk_change_net should be released using sk_release_kernel
2184 */
2185static inline void sk_change_net(struct sock *sk, struct net *net)
2186{
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +09002187 put_net(sock_net(sk));
Denis V. Lunev65a18ec2008-04-16 01:59:46 -07002188 sock_net_set(sk, hold_net(net));
Denis V. Lunevedf02082008-02-29 11:18:32 -08002189}
2190
KOVACS Krisztian23542612008-10-07 12:41:01 -07002191static inline struct sock *skb_steal_sock(struct sk_buff *skb)
2192{
Vijay Subramanianefc27f82012-06-24 13:03:07 +00002193 if (skb->sk) {
KOVACS Krisztian23542612008-10-07 12:41:01 -07002194 struct sock *sk = skb->sk;
2195
2196 skb->destructor = NULL;
2197 skb->sk = NULL;
2198 return sk;
2199 }
2200 return NULL;
2201}
2202
Patrick Ohly20d49472009-02-12 05:03:38 +00002203extern void sock_enable_timestamp(struct sock *sk, int flag);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002204extern int sock_get_timestamp(struct sock *, struct timeval __user *);
Eric Dumazetae40eb12007-03-18 17:33:16 -07002205extern int sock_get_timestampns(struct sock *, struct timespec __user *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002206
Eric Dumazetdc6b9b72012-05-16 22:48:15 +00002207/*
2208 * Enable debug/info messages
Linus Torvalds1da177e2005-04-16 15:20:36 -07002209 */
Stephen Hemmingera2a316f2007-03-08 20:41:08 -08002210extern int net_msg_warn;
2211#define NETDEBUG(fmt, args...) \
2212 do { if (net_msg_warn) printk(fmt,##args); } while (0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002213
Stephen Hemmingera2a316f2007-03-08 20:41:08 -08002214#define LIMIT_NETDEBUG(fmt, args...) \
2215 do { if (net_msg_warn && net_ratelimit()) printk(fmt,##args); } while(0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002216
Linus Torvalds1da177e2005-04-16 15:20:36 -07002217extern __u32 sysctl_wmem_max;
2218extern __u32 sysctl_rmem_max;
2219
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -03002220extern void sk_init(void);
2221
David S. Miller6baf1f42005-09-05 18:14:11 -07002222extern int sysctl_optmem_max;
2223
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -03002224extern __u32 sysctl_wmem_default;
2225extern __u32 sysctl_rmem_default;
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -03002226
Linus Torvalds1da177e2005-04-16 15:20:36 -07002227#endif /* _SOCK_H */