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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
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 | * | |
02c30a84 | 10 | * Authors: Ross Biro |
1da177e4 LT |
11 | * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> |
12 | * Corey Minyard <wf-rch!minyard@relay.EU.net> | |
13 | * Florian La Roche <flla@stud.uni-sb.de> | |
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 | ||
a6b7a407 | 43 | #include <linux/hardirq.h> |
172589cc | 44 | #include <linux/kernel.h> |
1da177e4 | 45 | #include <linux/list.h> |
88ab1932 | 46 | #include <linux/list_nulls.h> |
1da177e4 LT |
47 | #include <linux/timer.h> |
48 | #include <linux/cache.h> | |
a5b5bb9a | 49 | #include <linux/lockdep.h> |
1da177e4 LT |
50 | #include <linux/netdevice.h> |
51 | #include <linux/skbuff.h> /* struct sk_buff */ | |
d7fe0f24 | 52 | #include <linux/mm.h> |
1da177e4 | 53 | #include <linux/security.h> |
5a0e3ad6 | 54 | #include <linux/slab.h> |
c6e1a0d1 | 55 | #include <linux/uaccess.h> |
180d8cd9 | 56 | #include <linux/memcontrol.h> |
e1aab161 | 57 | #include <linux/res_counter.h> |
c5905afb | 58 | #include <linux/static_key.h> |
40401530 AV |
59 | #include <linux/aio.h> |
60 | #include <linux/sched.h> | |
1da177e4 LT |
61 | |
62 | #include <linux/filter.h> | |
88ab1932 | 63 | #include <linux/rculist_nulls.h> |
a57de0b4 | 64 | #include <linux/poll.h> |
1da177e4 | 65 | |
c31504dc | 66 | #include <linux/atomic.h> |
1da177e4 LT |
67 | #include <net/dst.h> |
68 | #include <net/checksum.h> | |
69 | ||
9f048bfb ED |
70 | struct cgroup; |
71 | struct cgroup_subsys; | |
c607b2ed | 72 | #ifdef CONFIG_NET |
d1a4c0b3 | 73 | int mem_cgroup_sockets_init(struct cgroup *cgrp, struct cgroup_subsys *ss); |
761b3ef5 | 74 | void mem_cgroup_sockets_destroy(struct cgroup *cgrp); |
c607b2ed GC |
75 | #else |
76 | static inline | |
77 | int mem_cgroup_sockets_init(struct cgroup *cgrp, struct cgroup_subsys *ss) | |
78 | { | |
79 | return 0; | |
80 | } | |
81 | static inline | |
761b3ef5 | 82 | void mem_cgroup_sockets_destroy(struct cgroup *cgrp) |
c607b2ed GC |
83 | { |
84 | } | |
85 | #endif | |
1da177e4 LT |
86 | /* |
87 | * This structure really needs to be cleaned up. | |
88 | * Most of it is for TCP, and not used by any of | |
89 | * the other protocols. | |
90 | */ | |
91 | ||
92 | /* Define this to get the SOCK_DBG debugging facility. */ | |
93 | #define SOCK_DEBUGGING | |
94 | #ifdef SOCK_DEBUGGING | |
95 | #define SOCK_DEBUG(sk, msg...) do { if ((sk) && sock_flag((sk), SOCK_DBG)) \ | |
96 | printk(KERN_DEBUG msg); } while (0) | |
97 | #else | |
4cd9029d | 98 | /* Validate arguments and do nothing */ |
b9075fa9 JP |
99 | static inline __printf(2, 3) |
100 | void SOCK_DEBUG(struct sock *sk, const char *msg, ...) | |
4cd9029d SH |
101 | { |
102 | } | |
1da177e4 LT |
103 | #endif |
104 | ||
105 | /* This is the per-socket lock. The spinlock provides a synchronization | |
106 | * between user contexts and software interrupt processing, whereas the | |
107 | * mini-semaphore synchronizes multiple users amongst themselves. | |
108 | */ | |
1da177e4 LT |
109 | typedef struct { |
110 | spinlock_t slock; | |
d2e9117c | 111 | int owned; |
1da177e4 | 112 | wait_queue_head_t wq; |
a5b5bb9a IM |
113 | /* |
114 | * We express the mutex-alike socket_lock semantics | |
115 | * to the lock validator by explicitly managing | |
116 | * the slock as a lock variant (in addition to | |
117 | * the slock itself): | |
118 | */ | |
119 | #ifdef CONFIG_DEBUG_LOCK_ALLOC | |
120 | struct lockdep_map dep_map; | |
121 | #endif | |
1da177e4 LT |
122 | } socket_lock_t; |
123 | ||
1da177e4 | 124 | struct sock; |
8feaf0c0 | 125 | struct proto; |
0eeb8ffc | 126 | struct net; |
1da177e4 LT |
127 | |
128 | /** | |
4dc3b16b | 129 | * struct sock_common - minimal network layer representation of sockets |
68835aba ED |
130 | * @skc_daddr: Foreign IPv4 addr |
131 | * @skc_rcv_saddr: Bound local IPv4 addr | |
4dc6dc71 | 132 | * @skc_hash: hash value used with various protocol lookup tables |
d4cada4a | 133 | * @skc_u16hashes: two u16 hash values used by UDP lookup tables |
4dc3b16b PP |
134 | * @skc_family: network address family |
135 | * @skc_state: Connection state | |
136 | * @skc_reuse: %SO_REUSEADDR setting | |
137 | * @skc_bound_dev_if: bound device index if != 0 | |
4dc3b16b | 138 | * @skc_bind_node: bind hash linkage for various protocol lookup tables |
512615b6 | 139 | * @skc_portaddr_node: second hash linkage for UDP/UDP-Lite protocol |
8feaf0c0 | 140 | * @skc_prot: protocol handlers inside a network family |
07feaebf | 141 | * @skc_net: reference to the network namespace of this socket |
68835aba ED |
142 | * @skc_node: main hash linkage for various protocol lookup tables |
143 | * @skc_nulls_node: main hash linkage for TCP/UDP/UDP-Lite protocol | |
144 | * @skc_tx_queue_mapping: tx queue number for this connection | |
145 | * @skc_refcnt: reference count | |
4dc3b16b PP |
146 | * |
147 | * This is the minimal network layer representation of sockets, the header | |
8feaf0c0 ACM |
148 | * for struct sock and struct inet_timewait_sock. |
149 | */ | |
1da177e4 | 150 | struct sock_common { |
68835aba ED |
151 | /* skc_daddr and skc_rcv_saddr must be grouped : |
152 | * cf INET_MATCH() and INET_TW_MATCH() | |
4dc6dc71 | 153 | */ |
68835aba ED |
154 | __be32 skc_daddr; |
155 | __be32 skc_rcv_saddr; | |
4dc6dc71 | 156 | |
d4cada4a ED |
157 | union { |
158 | unsigned int skc_hash; | |
159 | __u16 skc_u16hashes[2]; | |
160 | }; | |
4dc6dc71 ED |
161 | unsigned short skc_family; |
162 | volatile unsigned char skc_state; | |
163 | unsigned char skc_reuse; | |
164 | int skc_bound_dev_if; | |
512615b6 ED |
165 | union { |
166 | struct hlist_node skc_bind_node; | |
167 | struct hlist_nulls_node skc_portaddr_node; | |
168 | }; | |
8feaf0c0 | 169 | struct proto *skc_prot; |
3b1e0a65 | 170 | #ifdef CONFIG_NET_NS |
07feaebf | 171 | struct net *skc_net; |
3b1e0a65 | 172 | #endif |
68835aba ED |
173 | /* |
174 | * fields between dontcopy_begin/dontcopy_end | |
175 | * are not copied in sock_copy() | |
176 | */ | |
928c41e7 | 177 | /* private: */ |
68835aba | 178 | int skc_dontcopy_begin[0]; |
928c41e7 | 179 | /* public: */ |
68835aba ED |
180 | union { |
181 | struct hlist_node skc_node; | |
182 | struct hlist_nulls_node skc_nulls_node; | |
183 | }; | |
184 | int skc_tx_queue_mapping; | |
185 | atomic_t skc_refcnt; | |
928c41e7 | 186 | /* private: */ |
68835aba | 187 | int skc_dontcopy_end[0]; |
928c41e7 | 188 | /* public: */ |
1da177e4 LT |
189 | }; |
190 | ||
e1aab161 | 191 | struct cg_proto; |
1da177e4 LT |
192 | /** |
193 | * struct sock - network layer representation of sockets | |
8feaf0c0 | 194 | * @__sk_common: shared layout with inet_timewait_sock |
4dc3b16b PP |
195 | * @sk_shutdown: mask of %SEND_SHUTDOWN and/or %RCV_SHUTDOWN |
196 | * @sk_userlocks: %SO_SNDBUF and %SO_RCVBUF settings | |
197 | * @sk_lock: synchronizer | |
198 | * @sk_rcvbuf: size of receive buffer in bytes | |
43815482 | 199 | * @sk_wq: sock wait queue and async head |
4dc3b16b PP |
200 | * @sk_dst_cache: destination cache |
201 | * @sk_dst_lock: destination cache lock | |
202 | * @sk_policy: flow policy | |
4dc3b16b PP |
203 | * @sk_receive_queue: incoming packets |
204 | * @sk_wmem_alloc: transmit queue bytes committed | |
205 | * @sk_write_queue: Packet sending queue | |
97fc2f08 | 206 | * @sk_async_wait_queue: DMA copied packets |
4dc3b16b PP |
207 | * @sk_omem_alloc: "o" is "option" or "other" |
208 | * @sk_wmem_queued: persistent queue size | |
209 | * @sk_forward_alloc: space allocated forward | |
210 | * @sk_allocation: allocation mode | |
211 | * @sk_sndbuf: size of send buffer in bytes | |
33c732c3 | 212 | * @sk_flags: %SO_LINGER (l_onoff), %SO_BROADCAST, %SO_KEEPALIVE, |
20d49473 | 213 | * %SO_OOBINLINE settings, %SO_TIMESTAMPING settings |
4dc3b16b PP |
214 | * @sk_no_check: %SO_NO_CHECK setting, wether or not checkup packets |
215 | * @sk_route_caps: route capabilities (e.g. %NETIF_F_TSO) | |
a465419b | 216 | * @sk_route_nocaps: forbidden route capabilities (e.g NETIF_F_GSO_MASK) |
bcd76111 | 217 | * @sk_gso_type: GSO type (e.g. %SKB_GSO_TCPV4) |
82cc1a7a | 218 | * @sk_gso_max_size: Maximum GSO segment size to build |
4dc3b16b | 219 | * @sk_lingertime: %SO_LINGER l_linger setting |
4dc3b16b PP |
220 | * @sk_backlog: always used with the per-socket spinlock held |
221 | * @sk_callback_lock: used with the callbacks in the end of this struct | |
222 | * @sk_error_queue: rarely used | |
33c732c3 WC |
223 | * @sk_prot_creator: sk_prot of original sock creator (see ipv6_setsockopt, |
224 | * IPV6_ADDRFORM for instance) | |
4dc3b16b | 225 | * @sk_err: last error |
33c732c3 WC |
226 | * @sk_err_soft: errors that don't cause failure but are the cause of a |
227 | * persistent failure not just 'timed out' | |
cb61cb9b | 228 | * @sk_drops: raw/udp drops counter |
4dc3b16b PP |
229 | * @sk_ack_backlog: current listen backlog |
230 | * @sk_max_ack_backlog: listen backlog set in listen() | |
231 | * @sk_priority: %SO_PRIORITY setting | |
1a3bc369 | 232 | * @sk_cgrp_prioidx: socket group's priority map index |
4dc3b16b PP |
233 | * @sk_type: socket type (%SOCK_STREAM, etc) |
234 | * @sk_protocol: which protocol this socket belongs in this network family | |
53c3fa20 RD |
235 | * @sk_peer_pid: &struct pid for this socket's peer |
236 | * @sk_peer_cred: %SO_PEERCRED setting | |
4dc3b16b PP |
237 | * @sk_rcvlowat: %SO_RCVLOWAT setting |
238 | * @sk_rcvtimeo: %SO_RCVTIMEO setting | |
239 | * @sk_sndtimeo: %SO_SNDTIMEO setting | |
c58dc01b | 240 | * @sk_rxhash: flow hash received from netif layer |
4dc3b16b PP |
241 | * @sk_filter: socket filtering instructions |
242 | * @sk_protinfo: private area, net family specific, when not using slab | |
243 | * @sk_timer: sock cleanup timer | |
244 | * @sk_stamp: time stamp of last packet received | |
245 | * @sk_socket: Identd and reporting IO signals | |
246 | * @sk_user_data: RPC layer private data | |
247 | * @sk_sndmsg_page: cached page for sendmsg | |
248 | * @sk_sndmsg_off: cached offset for sendmsg | |
d3d4f0a0 | 249 | * @sk_peek_off: current peek_offset value |
4dc3b16b | 250 | * @sk_send_head: front of stuff to transmit |
67be2dd1 | 251 | * @sk_security: used by security modules |
31729363 | 252 | * @sk_mark: generic packet mark |
53c3fa20 | 253 | * @sk_classid: this socket's cgroup classid |
e1aab161 | 254 | * @sk_cgrp: this socket's cgroup-specific proto data |
4dc3b16b PP |
255 | * @sk_write_pending: a write to stream socket waits to start |
256 | * @sk_state_change: callback to indicate change in the state of the sock | |
257 | * @sk_data_ready: callback to indicate there is data to be processed | |
258 | * @sk_write_space: callback to indicate there is bf sending space available | |
259 | * @sk_error_report: callback to indicate errors (e.g. %MSG_ERRQUEUE) | |
260 | * @sk_backlog_rcv: callback to process the backlog | |
261 | * @sk_destruct: called at sock freeing time, i.e. when all refcnt == 0 | |
1da177e4 LT |
262 | */ |
263 | struct sock { | |
264 | /* | |
8feaf0c0 | 265 | * Now struct inet_timewait_sock also uses sock_common, so please just |
1da177e4 LT |
266 | * don't add nothing before this first member (__sk_common) --acme |
267 | */ | |
268 | struct sock_common __sk_common; | |
4dc6dc71 ED |
269 | #define sk_node __sk_common.skc_node |
270 | #define sk_nulls_node __sk_common.skc_nulls_node | |
271 | #define sk_refcnt __sk_common.skc_refcnt | |
e022f0b4 | 272 | #define sk_tx_queue_mapping __sk_common.skc_tx_queue_mapping |
4dc6dc71 | 273 | |
68835aba ED |
274 | #define sk_dontcopy_begin __sk_common.skc_dontcopy_begin |
275 | #define sk_dontcopy_end __sk_common.skc_dontcopy_end | |
4dc6dc71 | 276 | #define sk_hash __sk_common.skc_hash |
1da177e4 LT |
277 | #define sk_family __sk_common.skc_family |
278 | #define sk_state __sk_common.skc_state | |
279 | #define sk_reuse __sk_common.skc_reuse | |
280 | #define sk_bound_dev_if __sk_common.skc_bound_dev_if | |
1da177e4 | 281 | #define sk_bind_node __sk_common.skc_bind_node |
8feaf0c0 | 282 | #define sk_prot __sk_common.skc_prot |
07feaebf | 283 | #define sk_net __sk_common.skc_net |
1da177e4 | 284 | socket_lock_t sk_lock; |
b178bb3d | 285 | struct sk_buff_head sk_receive_queue; |
fa438ccf ED |
286 | /* |
287 | * The backlog queue is special, it is always used with | |
288 | * the per-socket spinlock held and requires low latency | |
289 | * access. Therefore we special case it's implementation. | |
b178bb3d ED |
290 | * Note : rmem_alloc is in this structure to fill a hole |
291 | * on 64bit arches, not because its logically part of | |
292 | * backlog. | |
fa438ccf ED |
293 | */ |
294 | struct { | |
b178bb3d ED |
295 | atomic_t rmem_alloc; |
296 | int len; | |
297 | struct sk_buff *head; | |
298 | struct sk_buff *tail; | |
fa438ccf | 299 | } sk_backlog; |
b178bb3d ED |
300 | #define sk_rmem_alloc sk_backlog.rmem_alloc |
301 | int sk_forward_alloc; | |
302 | #ifdef CONFIG_RPS | |
303 | __u32 sk_rxhash; | |
304 | #endif | |
305 | atomic_t sk_drops; | |
306 | int sk_rcvbuf; | |
307 | ||
308 | struct sk_filter __rcu *sk_filter; | |
eaefd110 | 309 | struct socket_wq __rcu *sk_wq; |
b178bb3d ED |
310 | |
311 | #ifdef CONFIG_NET_DMA | |
312 | struct sk_buff_head sk_async_wait_queue; | |
313 | #endif | |
314 | ||
def8b4fa | 315 | #ifdef CONFIG_XFRM |
1da177e4 | 316 | struct xfrm_policy *sk_policy[2]; |
def8b4fa | 317 | #endif |
b178bb3d ED |
318 | unsigned long sk_flags; |
319 | struct dst_entry *sk_dst_cache; | |
b6c6712a | 320 | spinlock_t sk_dst_lock; |
1da177e4 LT |
321 | atomic_t sk_wmem_alloc; |
322 | atomic_t sk_omem_alloc; | |
4e07a91c | 323 | int sk_sndbuf; |
1da177e4 | 324 | struct sk_buff_head sk_write_queue; |
b178bb3d ED |
325 | kmemcheck_bitfield_begin(flags); |
326 | unsigned int sk_shutdown : 2, | |
327 | sk_no_check : 2, | |
328 | sk_userlocks : 4, | |
329 | sk_protocol : 8, | |
330 | sk_type : 16; | |
331 | kmemcheck_bitfield_end(flags); | |
1da177e4 | 332 | int sk_wmem_queued; |
7d877f3b | 333 | gfp_t sk_allocation; |
c8f44aff MM |
334 | netdev_features_t sk_route_caps; |
335 | netdev_features_t sk_route_nocaps; | |
bcd76111 | 336 | int sk_gso_type; |
82cc1a7a | 337 | unsigned int sk_gso_max_size; |
9932cf95 | 338 | int sk_rcvlowat; |
1da177e4 | 339 | unsigned long sk_lingertime; |
1da177e4 | 340 | struct sk_buff_head sk_error_queue; |
476e19cf | 341 | struct proto *sk_prot_creator; |
1da177e4 LT |
342 | rwlock_t sk_callback_lock; |
343 | int sk_err, | |
344 | sk_err_soft; | |
345 | unsigned short sk_ack_backlog; | |
346 | unsigned short sk_max_ack_backlog; | |
347 | __u32 sk_priority; | |
5bc1421e NH |
348 | #ifdef CONFIG_CGROUPS |
349 | __u32 sk_cgrp_prioidx; | |
350 | #endif | |
109f6e39 EB |
351 | struct pid *sk_peer_pid; |
352 | const struct cred *sk_peer_cred; | |
1da177e4 LT |
353 | long sk_rcvtimeo; |
354 | long sk_sndtimeo; | |
1da177e4 LT |
355 | void *sk_protinfo; |
356 | struct timer_list sk_timer; | |
b7aa0bf7 | 357 | ktime_t sk_stamp; |
1da177e4 LT |
358 | struct socket *sk_socket; |
359 | void *sk_user_data; | |
360 | struct page *sk_sndmsg_page; | |
361 | struct sk_buff *sk_send_head; | |
362 | __u32 sk_sndmsg_off; | |
ef64a54f | 363 | __s32 sk_peek_off; |
1da177e4 | 364 | int sk_write_pending; |
d5f64238 | 365 | #ifdef CONFIG_SECURITY |
1da177e4 | 366 | void *sk_security; |
d5f64238 | 367 | #endif |
4a19ec58 | 368 | __u32 sk_mark; |
f8451725 | 369 | u32 sk_classid; |
e1aab161 | 370 | struct cg_proto *sk_cgrp; |
1da177e4 LT |
371 | void (*sk_state_change)(struct sock *sk); |
372 | void (*sk_data_ready)(struct sock *sk, int bytes); | |
373 | void (*sk_write_space)(struct sock *sk); | |
374 | void (*sk_error_report)(struct sock *sk); | |
375 | int (*sk_backlog_rcv)(struct sock *sk, | |
376 | struct sk_buff *skb); | |
377 | void (*sk_destruct)(struct sock *sk); | |
378 | }; | |
379 | ||
4a17fd52 PE |
380 | /* |
381 | * SK_CAN_REUSE and SK_NO_REUSE on a socket mean that the socket is OK | |
382 | * or not whether his port will be reused by someone else. SK_FORCE_REUSE | |
383 | * on a socket means that the socket will reuse everybody else's port | |
384 | * without looking at the other's sk_reuse value. | |
385 | */ | |
386 | ||
387 | #define SK_NO_REUSE 0 | |
388 | #define SK_CAN_REUSE 1 | |
389 | #define SK_FORCE_REUSE 2 | |
390 | ||
ef64a54f PE |
391 | static inline int sk_peek_offset(struct sock *sk, int flags) |
392 | { | |
393 | if ((flags & MSG_PEEK) && (sk->sk_peek_off >= 0)) | |
394 | return sk->sk_peek_off; | |
395 | else | |
396 | return 0; | |
397 | } | |
398 | ||
399 | static inline void sk_peek_offset_bwd(struct sock *sk, int val) | |
400 | { | |
401 | if (sk->sk_peek_off >= 0) { | |
402 | if (sk->sk_peek_off >= val) | |
403 | sk->sk_peek_off -= val; | |
404 | else | |
405 | sk->sk_peek_off = 0; | |
406 | } | |
407 | } | |
408 | ||
409 | static inline void sk_peek_offset_fwd(struct sock *sk, int val) | |
410 | { | |
411 | if (sk->sk_peek_off >= 0) | |
412 | sk->sk_peek_off += val; | |
413 | } | |
414 | ||
1da177e4 LT |
415 | /* |
416 | * Hashed lists helper routines | |
417 | */ | |
c4146644 LZ |
418 | static inline struct sock *sk_entry(const struct hlist_node *node) |
419 | { | |
420 | return hlist_entry(node, struct sock, sk_node); | |
421 | } | |
422 | ||
e48c414e | 423 | static inline struct sock *__sk_head(const struct hlist_head *head) |
1da177e4 LT |
424 | { |
425 | return hlist_entry(head->first, struct sock, sk_node); | |
426 | } | |
427 | ||
e48c414e | 428 | static inline struct sock *sk_head(const struct hlist_head *head) |
1da177e4 LT |
429 | { |
430 | return hlist_empty(head) ? NULL : __sk_head(head); | |
431 | } | |
432 | ||
88ab1932 ED |
433 | static inline struct sock *__sk_nulls_head(const struct hlist_nulls_head *head) |
434 | { | |
435 | return hlist_nulls_entry(head->first, struct sock, sk_nulls_node); | |
436 | } | |
437 | ||
438 | static inline struct sock *sk_nulls_head(const struct hlist_nulls_head *head) | |
439 | { | |
440 | return hlist_nulls_empty(head) ? NULL : __sk_nulls_head(head); | |
441 | } | |
442 | ||
e48c414e | 443 | static inline struct sock *sk_next(const struct sock *sk) |
1da177e4 LT |
444 | { |
445 | return sk->sk_node.next ? | |
446 | hlist_entry(sk->sk_node.next, struct sock, sk_node) : NULL; | |
447 | } | |
448 | ||
88ab1932 ED |
449 | static inline struct sock *sk_nulls_next(const struct sock *sk) |
450 | { | |
451 | return (!is_a_nulls(sk->sk_nulls_node.next)) ? | |
452 | hlist_nulls_entry(sk->sk_nulls_node.next, | |
453 | struct sock, sk_nulls_node) : | |
454 | NULL; | |
455 | } | |
456 | ||
e48c414e | 457 | static inline int sk_unhashed(const struct sock *sk) |
1da177e4 LT |
458 | { |
459 | return hlist_unhashed(&sk->sk_node); | |
460 | } | |
461 | ||
e48c414e | 462 | static inline int sk_hashed(const struct sock *sk) |
1da177e4 | 463 | { |
da753bea | 464 | return !sk_unhashed(sk); |
1da177e4 LT |
465 | } |
466 | ||
467 | static __inline__ void sk_node_init(struct hlist_node *node) | |
468 | { | |
469 | node->pprev = NULL; | |
470 | } | |
471 | ||
88ab1932 ED |
472 | static __inline__ void sk_nulls_node_init(struct hlist_nulls_node *node) |
473 | { | |
474 | node->pprev = NULL; | |
475 | } | |
476 | ||
1da177e4 LT |
477 | static __inline__ void __sk_del_node(struct sock *sk) |
478 | { | |
479 | __hlist_del(&sk->sk_node); | |
480 | } | |
481 | ||
808f5114 | 482 | /* NB: equivalent to hlist_del_init_rcu */ |
1da177e4 LT |
483 | static __inline__ int __sk_del_node_init(struct sock *sk) |
484 | { | |
485 | if (sk_hashed(sk)) { | |
486 | __sk_del_node(sk); | |
487 | sk_node_init(&sk->sk_node); | |
488 | return 1; | |
489 | } | |
490 | return 0; | |
491 | } | |
492 | ||
493 | /* Grab socket reference count. This operation is valid only | |
494 | when sk is ALREADY grabbed f.e. it is found in hash table | |
495 | or a list and the lookup is made under lock preventing hash table | |
496 | modifications. | |
497 | */ | |
498 | ||
499 | static inline void sock_hold(struct sock *sk) | |
500 | { | |
501 | atomic_inc(&sk->sk_refcnt); | |
502 | } | |
503 | ||
504 | /* Ungrab socket in the context, which assumes that socket refcnt | |
505 | cannot hit zero, f.e. it is true in context of any socketcall. | |
506 | */ | |
507 | static inline void __sock_put(struct sock *sk) | |
508 | { | |
509 | atomic_dec(&sk->sk_refcnt); | |
510 | } | |
511 | ||
512 | static __inline__ int sk_del_node_init(struct sock *sk) | |
513 | { | |
514 | int rc = __sk_del_node_init(sk); | |
515 | ||
516 | if (rc) { | |
517 | /* paranoid for a while -acme */ | |
518 | WARN_ON(atomic_read(&sk->sk_refcnt) == 1); | |
519 | __sock_put(sk); | |
520 | } | |
521 | return rc; | |
522 | } | |
808f5114 | 523 | #define sk_del_node_init_rcu(sk) sk_del_node_init(sk) |
1da177e4 | 524 | |
88ab1932 | 525 | static __inline__ int __sk_nulls_del_node_init_rcu(struct sock *sk) |
271b72c7 ED |
526 | { |
527 | if (sk_hashed(sk)) { | |
88ab1932 | 528 | hlist_nulls_del_init_rcu(&sk->sk_nulls_node); |
271b72c7 ED |
529 | return 1; |
530 | } | |
531 | return 0; | |
532 | } | |
533 | ||
88ab1932 | 534 | static __inline__ int sk_nulls_del_node_init_rcu(struct sock *sk) |
271b72c7 | 535 | { |
88ab1932 | 536 | int rc = __sk_nulls_del_node_init_rcu(sk); |
271b72c7 ED |
537 | |
538 | if (rc) { | |
539 | /* paranoid for a while -acme */ | |
540 | WARN_ON(atomic_read(&sk->sk_refcnt) == 1); | |
541 | __sock_put(sk); | |
542 | } | |
543 | return rc; | |
544 | } | |
545 | ||
1da177e4 LT |
546 | static __inline__ void __sk_add_node(struct sock *sk, struct hlist_head *list) |
547 | { | |
548 | hlist_add_head(&sk->sk_node, list); | |
549 | } | |
550 | ||
551 | static __inline__ void sk_add_node(struct sock *sk, struct hlist_head *list) | |
552 | { | |
553 | sock_hold(sk); | |
554 | __sk_add_node(sk, list); | |
555 | } | |
556 | ||
808f5114 | 557 | static __inline__ void sk_add_node_rcu(struct sock *sk, struct hlist_head *list) |
558 | { | |
559 | sock_hold(sk); | |
560 | hlist_add_head_rcu(&sk->sk_node, list); | |
561 | } | |
562 | ||
88ab1932 | 563 | static __inline__ void __sk_nulls_add_node_rcu(struct sock *sk, struct hlist_nulls_head *list) |
271b72c7 | 564 | { |
88ab1932 | 565 | hlist_nulls_add_head_rcu(&sk->sk_nulls_node, list); |
271b72c7 ED |
566 | } |
567 | ||
88ab1932 | 568 | static __inline__ void sk_nulls_add_node_rcu(struct sock *sk, struct hlist_nulls_head *list) |
271b72c7 ED |
569 | { |
570 | sock_hold(sk); | |
88ab1932 | 571 | __sk_nulls_add_node_rcu(sk, list); |
271b72c7 ED |
572 | } |
573 | ||
1da177e4 LT |
574 | static __inline__ void __sk_del_bind_node(struct sock *sk) |
575 | { | |
576 | __hlist_del(&sk->sk_bind_node); | |
577 | } | |
578 | ||
579 | static __inline__ void sk_add_bind_node(struct sock *sk, | |
580 | struct hlist_head *list) | |
581 | { | |
582 | hlist_add_head(&sk->sk_bind_node, list); | |
583 | } | |
584 | ||
585 | #define sk_for_each(__sk, node, list) \ | |
586 | hlist_for_each_entry(__sk, node, list, sk_node) | |
808f5114 | 587 | #define sk_for_each_rcu(__sk, node, list) \ |
588 | hlist_for_each_entry_rcu(__sk, node, list, sk_node) | |
88ab1932 ED |
589 | #define sk_nulls_for_each(__sk, node, list) \ |
590 | hlist_nulls_for_each_entry(__sk, node, list, sk_nulls_node) | |
591 | #define sk_nulls_for_each_rcu(__sk, node, list) \ | |
592 | hlist_nulls_for_each_entry_rcu(__sk, node, list, sk_nulls_node) | |
1da177e4 LT |
593 | #define sk_for_each_from(__sk, node) \ |
594 | if (__sk && ({ node = &(__sk)->sk_node; 1; })) \ | |
595 | hlist_for_each_entry_from(__sk, node, sk_node) | |
88ab1932 ED |
596 | #define sk_nulls_for_each_from(__sk, node) \ |
597 | if (__sk && ({ node = &(__sk)->sk_nulls_node; 1; })) \ | |
598 | hlist_nulls_for_each_entry_from(__sk, node, sk_nulls_node) | |
1da177e4 LT |
599 | #define sk_for_each_safe(__sk, node, tmp, list) \ |
600 | hlist_for_each_entry_safe(__sk, node, tmp, list, sk_node) | |
601 | #define sk_for_each_bound(__sk, node, list) \ | |
602 | hlist_for_each_entry(__sk, node, list, sk_bind_node) | |
603 | ||
604 | /* Sock flags */ | |
605 | enum sock_flags { | |
606 | SOCK_DEAD, | |
607 | SOCK_DONE, | |
608 | SOCK_URGINLINE, | |
609 | SOCK_KEEPOPEN, | |
610 | SOCK_LINGER, | |
611 | SOCK_DESTROY, | |
612 | SOCK_BROADCAST, | |
613 | SOCK_TIMESTAMP, | |
614 | SOCK_ZAPPED, | |
615 | SOCK_USE_WRITE_QUEUE, /* whether to call sk->sk_write_space in sock_wfree */ | |
616 | SOCK_DBG, /* %SO_DEBUG setting */ | |
617 | SOCK_RCVTSTAMP, /* %SO_TIMESTAMP setting */ | |
92f37fd2 | 618 | SOCK_RCVTSTAMPNS, /* %SO_TIMESTAMPNS setting */ |
1da177e4 LT |
619 | SOCK_LOCALROUTE, /* route locally only, %SO_DONTROUTE setting */ |
620 | SOCK_QUEUE_SHRUNK, /* write queue has been shrunk recently */ | |
20d49473 PO |
621 | SOCK_TIMESTAMPING_TX_HARDWARE, /* %SOF_TIMESTAMPING_TX_HARDWARE */ |
622 | SOCK_TIMESTAMPING_TX_SOFTWARE, /* %SOF_TIMESTAMPING_TX_SOFTWARE */ | |
623 | SOCK_TIMESTAMPING_RX_HARDWARE, /* %SOF_TIMESTAMPING_RX_HARDWARE */ | |
624 | SOCK_TIMESTAMPING_RX_SOFTWARE, /* %SOF_TIMESTAMPING_RX_SOFTWARE */ | |
625 | SOCK_TIMESTAMPING_SOFTWARE, /* %SOF_TIMESTAMPING_SOFTWARE */ | |
626 | SOCK_TIMESTAMPING_RAW_HARDWARE, /* %SOF_TIMESTAMPING_RAW_HARDWARE */ | |
627 | SOCK_TIMESTAMPING_SYS_HARDWARE, /* %SOF_TIMESTAMPING_SYS_HARDWARE */ | |
bcdce719 | 628 | SOCK_FASYNC, /* fasync() active */ |
3b885787 | 629 | SOCK_RXQ_OVFL, |
1cdebb42 | 630 | SOCK_ZEROCOPY, /* buffers from userspace */ |
6e3e939f | 631 | SOCK_WIFI_STATUS, /* push wifi status to userspace */ |
3bdc0eba BG |
632 | SOCK_NOFCS, /* Tell NIC not to do the Ethernet FCS. |
633 | * Will use last 4 bytes of packet sent from | |
634 | * user-space instead. | |
635 | */ | |
1da177e4 LT |
636 | }; |
637 | ||
53b924b3 RB |
638 | static inline void sock_copy_flags(struct sock *nsk, struct sock *osk) |
639 | { | |
640 | nsk->sk_flags = osk->sk_flags; | |
641 | } | |
642 | ||
1da177e4 LT |
643 | static inline void sock_set_flag(struct sock *sk, enum sock_flags flag) |
644 | { | |
645 | __set_bit(flag, &sk->sk_flags); | |
646 | } | |
647 | ||
648 | static inline void sock_reset_flag(struct sock *sk, enum sock_flags flag) | |
649 | { | |
650 | __clear_bit(flag, &sk->sk_flags); | |
651 | } | |
652 | ||
1b23a5df | 653 | static inline bool sock_flag(const struct sock *sk, enum sock_flags flag) |
1da177e4 LT |
654 | { |
655 | return test_bit(flag, &sk->sk_flags); | |
656 | } | |
657 | ||
658 | static inline void sk_acceptq_removed(struct sock *sk) | |
659 | { | |
660 | sk->sk_ack_backlog--; | |
661 | } | |
662 | ||
663 | static inline void sk_acceptq_added(struct sock *sk) | |
664 | { | |
665 | sk->sk_ack_backlog++; | |
666 | } | |
667 | ||
668 | static inline int sk_acceptq_is_full(struct sock *sk) | |
669 | { | |
64a14651 | 670 | return sk->sk_ack_backlog > sk->sk_max_ack_backlog; |
1da177e4 LT |
671 | } |
672 | ||
673 | /* | |
674 | * Compute minimal free write space needed to queue new packets. | |
675 | */ | |
676 | static inline int sk_stream_min_wspace(struct sock *sk) | |
677 | { | |
8df09ea3 | 678 | return sk->sk_wmem_queued >> 1; |
1da177e4 LT |
679 | } |
680 | ||
681 | static inline int sk_stream_wspace(struct sock *sk) | |
682 | { | |
683 | return sk->sk_sndbuf - sk->sk_wmem_queued; | |
684 | } | |
685 | ||
686 | extern void sk_stream_write_space(struct sock *sk); | |
687 | ||
688 | static inline int sk_stream_memory_free(struct sock *sk) | |
689 | { | |
690 | return sk->sk_wmem_queued < sk->sk_sndbuf; | |
691 | } | |
692 | ||
8eae939f | 693 | /* OOB backlog add */ |
a3a858ff | 694 | static inline void __sk_add_backlog(struct sock *sk, struct sk_buff *skb) |
9ee6b535 | 695 | { |
7fee226a ED |
696 | /* dont let skb dst not refcounted, we are going to leave rcu lock */ |
697 | skb_dst_force(skb); | |
698 | ||
699 | if (!sk->sk_backlog.tail) | |
700 | sk->sk_backlog.head = skb; | |
701 | else | |
9ee6b535 | 702 | sk->sk_backlog.tail->next = skb; |
7fee226a ED |
703 | |
704 | sk->sk_backlog.tail = skb; | |
9ee6b535 SH |
705 | skb->next = NULL; |
706 | } | |
1da177e4 | 707 | |
c377411f ED |
708 | /* |
709 | * Take into account size of receive queue and backlog queue | |
0fd7bac6 ED |
710 | * Do not take into account this skb truesize, |
711 | * to allow even a single big packet to come. | |
c377411f | 712 | */ |
f545a38f ED |
713 | static inline bool sk_rcvqueues_full(const struct sock *sk, const struct sk_buff *skb, |
714 | unsigned int limit) | |
c377411f ED |
715 | { |
716 | unsigned int qsize = sk->sk_backlog.len + atomic_read(&sk->sk_rmem_alloc); | |
717 | ||
f545a38f | 718 | return qsize > limit; |
c377411f ED |
719 | } |
720 | ||
8eae939f | 721 | /* The per-socket spinlock must be held here. */ |
f545a38f ED |
722 | static inline __must_check int sk_add_backlog(struct sock *sk, struct sk_buff *skb, |
723 | unsigned int limit) | |
8eae939f | 724 | { |
f545a38f | 725 | if (sk_rcvqueues_full(sk, skb, limit)) |
8eae939f ZY |
726 | return -ENOBUFS; |
727 | ||
a3a858ff | 728 | __sk_add_backlog(sk, skb); |
8eae939f ZY |
729 | sk->sk_backlog.len += skb->truesize; |
730 | return 0; | |
731 | } | |
732 | ||
c57943a1 PZ |
733 | static inline int sk_backlog_rcv(struct sock *sk, struct sk_buff *skb) |
734 | { | |
735 | return sk->sk_backlog_rcv(sk, skb); | |
736 | } | |
737 | ||
c58dc01b DM |
738 | static inline void sock_rps_record_flow(const struct sock *sk) |
739 | { | |
740 | #ifdef CONFIG_RPS | |
741 | struct rps_sock_flow_table *sock_flow_table; | |
742 | ||
743 | rcu_read_lock(); | |
744 | sock_flow_table = rcu_dereference(rps_sock_flow_table); | |
745 | rps_record_sock_flow(sock_flow_table, sk->sk_rxhash); | |
746 | rcu_read_unlock(); | |
747 | #endif | |
748 | } | |
749 | ||
750 | static inline void sock_rps_reset_flow(const struct sock *sk) | |
751 | { | |
752 | #ifdef CONFIG_RPS | |
753 | struct rps_sock_flow_table *sock_flow_table; | |
754 | ||
755 | rcu_read_lock(); | |
756 | sock_flow_table = rcu_dereference(rps_sock_flow_table); | |
757 | rps_reset_sock_flow(sock_flow_table, sk->sk_rxhash); | |
758 | rcu_read_unlock(); | |
759 | #endif | |
760 | } | |
761 | ||
bdeab991 TH |
762 | static inline void sock_rps_save_rxhash(struct sock *sk, |
763 | const struct sk_buff *skb) | |
c58dc01b DM |
764 | { |
765 | #ifdef CONFIG_RPS | |
bdeab991 | 766 | if (unlikely(sk->sk_rxhash != skb->rxhash)) { |
c58dc01b | 767 | sock_rps_reset_flow(sk); |
bdeab991 | 768 | sk->sk_rxhash = skb->rxhash; |
c58dc01b DM |
769 | } |
770 | #endif | |
771 | } | |
772 | ||
bdeab991 TH |
773 | static inline void sock_rps_reset_rxhash(struct sock *sk) |
774 | { | |
775 | #ifdef CONFIG_RPS | |
776 | sock_rps_reset_flow(sk); | |
777 | sk->sk_rxhash = 0; | |
778 | #endif | |
779 | } | |
780 | ||
cfcabdcc SH |
781 | #define sk_wait_event(__sk, __timeo, __condition) \ |
782 | ({ int __rc; \ | |
783 | release_sock(__sk); \ | |
784 | __rc = __condition; \ | |
785 | if (!__rc) { \ | |
786 | *(__timeo) = schedule_timeout(*(__timeo)); \ | |
787 | } \ | |
788 | lock_sock(__sk); \ | |
789 | __rc = __condition; \ | |
790 | __rc; \ | |
791 | }) | |
1da177e4 LT |
792 | |
793 | extern int sk_stream_wait_connect(struct sock *sk, long *timeo_p); | |
794 | extern int sk_stream_wait_memory(struct sock *sk, long *timeo_p); | |
795 | extern void sk_stream_wait_close(struct sock *sk, long timeo_p); | |
796 | extern int sk_stream_error(struct sock *sk, int flags, int err); | |
797 | extern void sk_stream_kill_queues(struct sock *sk); | |
798 | ||
799 | extern int sk_wait_data(struct sock *sk, long *timeo); | |
800 | ||
60236fdd | 801 | struct request_sock_ops; |
6d6ee43e | 802 | struct timewait_sock_ops; |
ab1e0a13 | 803 | struct inet_hashinfo; |
fc8717ba | 804 | struct raw_hashinfo; |
de477254 | 805 | struct module; |
2e6599cb | 806 | |
1da177e4 LT |
807 | /* Networking protocol blocks we attach to sockets. |
808 | * socket layer -> transport layer interface | |
809 | * transport -> network interface is defined by struct inet_proto | |
810 | */ | |
811 | struct proto { | |
812 | void (*close)(struct sock *sk, | |
813 | long timeout); | |
814 | int (*connect)(struct sock *sk, | |
815 | struct sockaddr *uaddr, | |
816 | int addr_len); | |
817 | int (*disconnect)(struct sock *sk, int flags); | |
818 | ||
819 | struct sock * (*accept) (struct sock *sk, int flags, int *err); | |
820 | ||
821 | int (*ioctl)(struct sock *sk, int cmd, | |
822 | unsigned long arg); | |
823 | int (*init)(struct sock *sk); | |
7d06b2e0 | 824 | void (*destroy)(struct sock *sk); |
1da177e4 LT |
825 | void (*shutdown)(struct sock *sk, int how); |
826 | int (*setsockopt)(struct sock *sk, int level, | |
827 | int optname, char __user *optval, | |
b7058842 | 828 | unsigned int optlen); |
1da177e4 LT |
829 | int (*getsockopt)(struct sock *sk, int level, |
830 | int optname, char __user *optval, | |
831 | int __user *option); | |
af01d537 | 832 | #ifdef CONFIG_COMPAT |
3fdadf7d DM |
833 | int (*compat_setsockopt)(struct sock *sk, |
834 | int level, | |
835 | int optname, char __user *optval, | |
b7058842 | 836 | unsigned int optlen); |
3fdadf7d DM |
837 | int (*compat_getsockopt)(struct sock *sk, |
838 | int level, | |
839 | int optname, char __user *optval, | |
840 | int __user *option); | |
709b46e8 EB |
841 | int (*compat_ioctl)(struct sock *sk, |
842 | unsigned int cmd, unsigned long arg); | |
af01d537 | 843 | #endif |
1da177e4 LT |
844 | int (*sendmsg)(struct kiocb *iocb, struct sock *sk, |
845 | struct msghdr *msg, size_t len); | |
846 | int (*recvmsg)(struct kiocb *iocb, struct sock *sk, | |
847 | struct msghdr *msg, | |
848 | size_t len, int noblock, int flags, | |
849 | int *addr_len); | |
850 | int (*sendpage)(struct sock *sk, struct page *page, | |
851 | int offset, size_t size, int flags); | |
852 | int (*bind)(struct sock *sk, | |
853 | struct sockaddr *uaddr, int addr_len); | |
854 | ||
855 | int (*backlog_rcv) (struct sock *sk, | |
856 | struct sk_buff *skb); | |
857 | ||
858 | /* Keeping track of sk's, looking them up, and port selection methods. */ | |
859 | void (*hash)(struct sock *sk); | |
860 | void (*unhash)(struct sock *sk); | |
719f8358 | 861 | void (*rehash)(struct sock *sk); |
1da177e4 | 862 | int (*get_port)(struct sock *sk, unsigned short snum); |
fcbdf09d | 863 | void (*clear_sk)(struct sock *sk, int size); |
1da177e4 | 864 | |
286ab3d4 | 865 | /* Keeping track of sockets in use */ |
65f76517 | 866 | #ifdef CONFIG_PROC_FS |
13ff3d6f | 867 | unsigned int inuse_idx; |
65f76517 | 868 | #endif |
ebb53d75 | 869 | |
1da177e4 | 870 | /* Memory pressure */ |
5c52ba17 | 871 | void (*enter_memory_pressure)(struct sock *sk); |
8d987e5c | 872 | atomic_long_t *memory_allocated; /* Current allocated memory. */ |
1748376b | 873 | struct percpu_counter *sockets_allocated; /* Current number of sockets. */ |
1da177e4 LT |
874 | /* |
875 | * Pressure flag: try to collapse. | |
876 | * Technical note: it is used by multiple contexts non atomically. | |
3ab224be | 877 | * All the __sk_mem_schedule() is of this nature: accounting |
1da177e4 LT |
878 | * is strict, actions are advisory and have some latency. |
879 | */ | |
880 | int *memory_pressure; | |
8d987e5c | 881 | long *sysctl_mem; |
1da177e4 LT |
882 | int *sysctl_wmem; |
883 | int *sysctl_rmem; | |
884 | int max_header; | |
7ba42910 | 885 | bool no_autobind; |
1da177e4 | 886 | |
271b72c7 | 887 | struct kmem_cache *slab; |
1da177e4 | 888 | unsigned int obj_size; |
271b72c7 | 889 | int slab_flags; |
1da177e4 | 890 | |
dd24c001 | 891 | struct percpu_counter *orphan_count; |
8feaf0c0 | 892 | |
60236fdd | 893 | struct request_sock_ops *rsk_prot; |
6d6ee43e | 894 | struct timewait_sock_ops *twsk_prot; |
2e6599cb | 895 | |
39d8cda7 PE |
896 | union { |
897 | struct inet_hashinfo *hashinfo; | |
645ca708 | 898 | struct udp_table *udp_table; |
fc8717ba | 899 | struct raw_hashinfo *raw_hash; |
39d8cda7 | 900 | } h; |
ab1e0a13 | 901 | |
1da177e4 LT |
902 | struct module *owner; |
903 | ||
904 | char name[32]; | |
905 | ||
906 | struct list_head node; | |
e6848976 ACM |
907 | #ifdef SOCK_REFCNT_DEBUG |
908 | atomic_t socks; | |
909 | #endif | |
e1aab161 GC |
910 | #ifdef CONFIG_CGROUP_MEM_RES_CTLR_KMEM |
911 | /* | |
912 | * cgroup specific init/deinit functions. Called once for all | |
913 | * protocols that implement it, from cgroups populate function. | |
914 | * This function has to setup any files the protocol want to | |
915 | * appear in the kmem cgroup filesystem. | |
916 | */ | |
917 | int (*init_cgroup)(struct cgroup *cgrp, | |
918 | struct cgroup_subsys *ss); | |
761b3ef5 | 919 | void (*destroy_cgroup)(struct cgroup *cgrp); |
e1aab161 GC |
920 | struct cg_proto *(*proto_cgroup)(struct mem_cgroup *memcg); |
921 | #endif | |
922 | }; | |
923 | ||
924 | struct cg_proto { | |
925 | void (*enter_memory_pressure)(struct sock *sk); | |
926 | struct res_counter *memory_allocated; /* Current allocated memory. */ | |
927 | struct percpu_counter *sockets_allocated; /* Current number of sockets. */ | |
928 | int *memory_pressure; | |
929 | long *sysctl_mem; | |
930 | /* | |
931 | * memcg field is used to find which memcg we belong directly | |
932 | * Each memcg struct can hold more than one cg_proto, so container_of | |
933 | * won't really cut. | |
934 | * | |
935 | * The elegant solution would be having an inverse function to | |
936 | * proto_cgroup in struct proto, but that means polluting the structure | |
937 | * for everybody, instead of just for memcg users. | |
938 | */ | |
939 | struct mem_cgroup *memcg; | |
1da177e4 LT |
940 | }; |
941 | ||
942 | extern int proto_register(struct proto *prot, int alloc_slab); | |
943 | extern void proto_unregister(struct proto *prot); | |
944 | ||
e6848976 ACM |
945 | #ifdef SOCK_REFCNT_DEBUG |
946 | static inline void sk_refcnt_debug_inc(struct sock *sk) | |
947 | { | |
948 | atomic_inc(&sk->sk_prot->socks); | |
949 | } | |
950 | ||
951 | static inline void sk_refcnt_debug_dec(struct sock *sk) | |
952 | { | |
953 | atomic_dec(&sk->sk_prot->socks); | |
954 | printk(KERN_DEBUG "%s socket %p released, %d are still alive\n", | |
955 | sk->sk_prot->name, sk, atomic_read(&sk->sk_prot->socks)); | |
956 | } | |
957 | ||
e1aab161 | 958 | inline void sk_refcnt_debug_release(const struct sock *sk) |
e6848976 ACM |
959 | { |
960 | if (atomic_read(&sk->sk_refcnt) != 1) | |
961 | printk(KERN_DEBUG "Destruction of the %s socket %p delayed, refcnt=%d\n", | |
962 | sk->sk_prot->name, sk, atomic_read(&sk->sk_refcnt)); | |
963 | } | |
964 | #else /* SOCK_REFCNT_DEBUG */ | |
965 | #define sk_refcnt_debug_inc(sk) do { } while (0) | |
966 | #define sk_refcnt_debug_dec(sk) do { } while (0) | |
967 | #define sk_refcnt_debug_release(sk) do { } while (0) | |
968 | #endif /* SOCK_REFCNT_DEBUG */ | |
969 | ||
376be5ff | 970 | #if defined(CONFIG_CGROUP_MEM_RES_CTLR_KMEM) && defined(CONFIG_NET) |
c5905afb | 971 | extern struct static_key memcg_socket_limit_enabled; |
e1aab161 GC |
972 | static inline struct cg_proto *parent_cg_proto(struct proto *proto, |
973 | struct cg_proto *cg_proto) | |
974 | { | |
975 | return proto->proto_cgroup(parent_mem_cgroup(cg_proto->memcg)); | |
976 | } | |
c5905afb | 977 | #define mem_cgroup_sockets_enabled static_key_false(&memcg_socket_limit_enabled) |
e1aab161 GC |
978 | #else |
979 | #define mem_cgroup_sockets_enabled 0 | |
980 | static inline struct cg_proto *parent_cg_proto(struct proto *proto, | |
981 | struct cg_proto *cg_proto) | |
982 | { | |
983 | return NULL; | |
984 | } | |
985 | #endif | |
986 | ||
987 | ||
180d8cd9 GC |
988 | static inline bool sk_has_memory_pressure(const struct sock *sk) |
989 | { | |
990 | return sk->sk_prot->memory_pressure != NULL; | |
991 | } | |
992 | ||
993 | static inline bool sk_under_memory_pressure(const struct sock *sk) | |
994 | { | |
995 | if (!sk->sk_prot->memory_pressure) | |
996 | return false; | |
e1aab161 GC |
997 | |
998 | if (mem_cgroup_sockets_enabled && sk->sk_cgrp) | |
999 | return !!*sk->sk_cgrp->memory_pressure; | |
1000 | ||
180d8cd9 GC |
1001 | return !!*sk->sk_prot->memory_pressure; |
1002 | } | |
1003 | ||
1004 | static inline void sk_leave_memory_pressure(struct sock *sk) | |
1005 | { | |
1006 | int *memory_pressure = sk->sk_prot->memory_pressure; | |
1007 | ||
e1aab161 GC |
1008 | if (!memory_pressure) |
1009 | return; | |
1010 | ||
1011 | if (*memory_pressure) | |
180d8cd9 | 1012 | *memory_pressure = 0; |
e1aab161 GC |
1013 | |
1014 | if (mem_cgroup_sockets_enabled && sk->sk_cgrp) { | |
1015 | struct cg_proto *cg_proto = sk->sk_cgrp; | |
1016 | struct proto *prot = sk->sk_prot; | |
1017 | ||
1018 | for (; cg_proto; cg_proto = parent_cg_proto(prot, cg_proto)) | |
1019 | if (*cg_proto->memory_pressure) | |
1020 | *cg_proto->memory_pressure = 0; | |
1021 | } | |
1022 | ||
180d8cd9 GC |
1023 | } |
1024 | ||
1025 | static inline void sk_enter_memory_pressure(struct sock *sk) | |
1026 | { | |
e1aab161 GC |
1027 | if (!sk->sk_prot->enter_memory_pressure) |
1028 | return; | |
1029 | ||
1030 | if (mem_cgroup_sockets_enabled && sk->sk_cgrp) { | |
1031 | struct cg_proto *cg_proto = sk->sk_cgrp; | |
1032 | struct proto *prot = sk->sk_prot; | |
1033 | ||
1034 | for (; cg_proto; cg_proto = parent_cg_proto(prot, cg_proto)) | |
1035 | cg_proto->enter_memory_pressure(sk); | |
1036 | } | |
1037 | ||
1038 | sk->sk_prot->enter_memory_pressure(sk); | |
180d8cd9 GC |
1039 | } |
1040 | ||
1041 | static inline long sk_prot_mem_limits(const struct sock *sk, int index) | |
1042 | { | |
1043 | long *prot = sk->sk_prot->sysctl_mem; | |
e1aab161 GC |
1044 | if (mem_cgroup_sockets_enabled && sk->sk_cgrp) |
1045 | prot = sk->sk_cgrp->sysctl_mem; | |
180d8cd9 GC |
1046 | return prot[index]; |
1047 | } | |
1048 | ||
e1aab161 GC |
1049 | static inline void memcg_memory_allocated_add(struct cg_proto *prot, |
1050 | unsigned long amt, | |
1051 | int *parent_status) | |
1052 | { | |
1053 | struct res_counter *fail; | |
1054 | int ret; | |
1055 | ||
0e90b31f GC |
1056 | ret = res_counter_charge_nofail(prot->memory_allocated, |
1057 | amt << PAGE_SHIFT, &fail); | |
e1aab161 GC |
1058 | if (ret < 0) |
1059 | *parent_status = OVER_LIMIT; | |
1060 | } | |
1061 | ||
1062 | static inline void memcg_memory_allocated_sub(struct cg_proto *prot, | |
1063 | unsigned long amt) | |
1064 | { | |
1065 | res_counter_uncharge(prot->memory_allocated, amt << PAGE_SHIFT); | |
1066 | } | |
1067 | ||
1068 | static inline u64 memcg_memory_allocated_read(struct cg_proto *prot) | |
1069 | { | |
1070 | u64 ret; | |
1071 | ret = res_counter_read_u64(prot->memory_allocated, RES_USAGE); | |
1072 | return ret >> PAGE_SHIFT; | |
1073 | } | |
1074 | ||
180d8cd9 GC |
1075 | static inline long |
1076 | sk_memory_allocated(const struct sock *sk) | |
1077 | { | |
1078 | struct proto *prot = sk->sk_prot; | |
e1aab161 GC |
1079 | if (mem_cgroup_sockets_enabled && sk->sk_cgrp) |
1080 | return memcg_memory_allocated_read(sk->sk_cgrp); | |
1081 | ||
180d8cd9 GC |
1082 | return atomic_long_read(prot->memory_allocated); |
1083 | } | |
1084 | ||
1085 | static inline long | |
e1aab161 | 1086 | sk_memory_allocated_add(struct sock *sk, int amt, int *parent_status) |
180d8cd9 GC |
1087 | { |
1088 | struct proto *prot = sk->sk_prot; | |
e1aab161 GC |
1089 | |
1090 | if (mem_cgroup_sockets_enabled && sk->sk_cgrp) { | |
1091 | memcg_memory_allocated_add(sk->sk_cgrp, amt, parent_status); | |
1092 | /* update the root cgroup regardless */ | |
1093 | atomic_long_add_return(amt, prot->memory_allocated); | |
1094 | return memcg_memory_allocated_read(sk->sk_cgrp); | |
1095 | } | |
1096 | ||
180d8cd9 GC |
1097 | return atomic_long_add_return(amt, prot->memory_allocated); |
1098 | } | |
1099 | ||
1100 | static inline void | |
0e90b31f | 1101 | sk_memory_allocated_sub(struct sock *sk, int amt) |
180d8cd9 GC |
1102 | { |
1103 | struct proto *prot = sk->sk_prot; | |
e1aab161 | 1104 | |
0e90b31f | 1105 | if (mem_cgroup_sockets_enabled && sk->sk_cgrp) |
e1aab161 GC |
1106 | memcg_memory_allocated_sub(sk->sk_cgrp, amt); |
1107 | ||
180d8cd9 GC |
1108 | atomic_long_sub(amt, prot->memory_allocated); |
1109 | } | |
1110 | ||
1111 | static inline void sk_sockets_allocated_dec(struct sock *sk) | |
1112 | { | |
1113 | struct proto *prot = sk->sk_prot; | |
e1aab161 GC |
1114 | |
1115 | if (mem_cgroup_sockets_enabled && sk->sk_cgrp) { | |
1116 | struct cg_proto *cg_proto = sk->sk_cgrp; | |
1117 | ||
1118 | for (; cg_proto; cg_proto = parent_cg_proto(prot, cg_proto)) | |
1119 | percpu_counter_dec(cg_proto->sockets_allocated); | |
1120 | } | |
1121 | ||
180d8cd9 GC |
1122 | percpu_counter_dec(prot->sockets_allocated); |
1123 | } | |
1124 | ||
1125 | static inline void sk_sockets_allocated_inc(struct sock *sk) | |
1126 | { | |
1127 | struct proto *prot = sk->sk_prot; | |
e1aab161 GC |
1128 | |
1129 | if (mem_cgroup_sockets_enabled && sk->sk_cgrp) { | |
1130 | struct cg_proto *cg_proto = sk->sk_cgrp; | |
1131 | ||
1132 | for (; cg_proto; cg_proto = parent_cg_proto(prot, cg_proto)) | |
1133 | percpu_counter_inc(cg_proto->sockets_allocated); | |
1134 | } | |
1135 | ||
180d8cd9 GC |
1136 | percpu_counter_inc(prot->sockets_allocated); |
1137 | } | |
1138 | ||
1139 | static inline int | |
1140 | sk_sockets_allocated_read_positive(struct sock *sk) | |
1141 | { | |
1142 | struct proto *prot = sk->sk_prot; | |
1143 | ||
e1aab161 | 1144 | if (mem_cgroup_sockets_enabled && sk->sk_cgrp) |
518fbf9c | 1145 | return percpu_counter_read_positive(sk->sk_cgrp->sockets_allocated); |
e1aab161 | 1146 | |
518fbf9c | 1147 | return percpu_counter_read_positive(prot->sockets_allocated); |
180d8cd9 GC |
1148 | } |
1149 | ||
1150 | static inline int | |
1151 | proto_sockets_allocated_sum_positive(struct proto *prot) | |
1152 | { | |
1153 | return percpu_counter_sum_positive(prot->sockets_allocated); | |
1154 | } | |
1155 | ||
1156 | static inline long | |
1157 | proto_memory_allocated(struct proto *prot) | |
1158 | { | |
1159 | return atomic_long_read(prot->memory_allocated); | |
1160 | } | |
1161 | ||
1162 | static inline bool | |
1163 | proto_memory_pressure(struct proto *prot) | |
1164 | { | |
1165 | if (!prot->memory_pressure) | |
1166 | return false; | |
1167 | return !!*prot->memory_pressure; | |
1168 | } | |
1169 | ||
65f76517 ED |
1170 | |
1171 | #ifdef CONFIG_PROC_FS | |
1da177e4 | 1172 | /* Called with local bh disabled */ |
c29a0bc4 PE |
1173 | extern void sock_prot_inuse_add(struct net *net, struct proto *prot, int inc); |
1174 | extern int sock_prot_inuse_get(struct net *net, struct proto *proto); | |
65f76517 | 1175 | #else |
c29a0bc4 PE |
1176 | static void inline sock_prot_inuse_add(struct net *net, struct proto *prot, |
1177 | int inc) | |
65f76517 ED |
1178 | { |
1179 | } | |
65f76517 ED |
1180 | #endif |
1181 | ||
1da177e4 | 1182 | |
614c6cb4 ACM |
1183 | /* With per-bucket locks this operation is not-atomic, so that |
1184 | * this version is not worse. | |
1185 | */ | |
1186 | static inline void __sk_prot_rehash(struct sock *sk) | |
1187 | { | |
1188 | sk->sk_prot->unhash(sk); | |
1189 | sk->sk_prot->hash(sk); | |
1190 | } | |
1191 | ||
fcbdf09d OP |
1192 | void sk_prot_clear_portaddr_nulls(struct sock *sk, int size); |
1193 | ||
1da177e4 LT |
1194 | /* About 10 seconds */ |
1195 | #define SOCK_DESTROY_TIME (10*HZ) | |
1196 | ||
1197 | /* Sockets 0-1023 can't be bound to unless you are superuser */ | |
1198 | #define PROT_SOCK 1024 | |
1199 | ||
1200 | #define SHUTDOWN_MASK 3 | |
1201 | #define RCV_SHUTDOWN 1 | |
1202 | #define SEND_SHUTDOWN 2 | |
1203 | ||
1204 | #define SOCK_SNDBUF_LOCK 1 | |
1205 | #define SOCK_RCVBUF_LOCK 2 | |
1206 | #define SOCK_BINDADDR_LOCK 4 | |
1207 | #define SOCK_BINDPORT_LOCK 8 | |
1208 | ||
1209 | /* sock_iocb: used to kick off async processing of socket ios */ | |
1210 | struct sock_iocb { | |
1211 | struct list_head list; | |
1212 | ||
1213 | int flags; | |
1214 | int size; | |
1215 | struct socket *sock; | |
1216 | struct sock *sk; | |
1217 | struct scm_cookie *scm; | |
1218 | struct msghdr *msg, async_msg; | |
1da177e4 LT |
1219 | struct kiocb *kiocb; |
1220 | }; | |
1221 | ||
1222 | static inline struct sock_iocb *kiocb_to_siocb(struct kiocb *iocb) | |
1223 | { | |
1224 | return (struct sock_iocb *)iocb->private; | |
1225 | } | |
1226 | ||
1227 | static inline struct kiocb *siocb_to_kiocb(struct sock_iocb *si) | |
1228 | { | |
1229 | return si->kiocb; | |
1230 | } | |
1231 | ||
1232 | struct socket_alloc { | |
1233 | struct socket socket; | |
1234 | struct inode vfs_inode; | |
1235 | }; | |
1236 | ||
1237 | static inline struct socket *SOCKET_I(struct inode *inode) | |
1238 | { | |
1239 | return &container_of(inode, struct socket_alloc, vfs_inode)->socket; | |
1240 | } | |
1241 | ||
1242 | static inline struct inode *SOCK_INODE(struct socket *socket) | |
1243 | { | |
1244 | return &container_of(socket, struct socket_alloc, socket)->vfs_inode; | |
1245 | } | |
1246 | ||
3ab224be HA |
1247 | /* |
1248 | * Functions for memory accounting | |
1249 | */ | |
1250 | extern int __sk_mem_schedule(struct sock *sk, int size, int kind); | |
1251 | extern void __sk_mem_reclaim(struct sock *sk); | |
1da177e4 | 1252 | |
3ab224be HA |
1253 | #define SK_MEM_QUANTUM ((int)PAGE_SIZE) |
1254 | #define SK_MEM_QUANTUM_SHIFT ilog2(SK_MEM_QUANTUM) | |
1255 | #define SK_MEM_SEND 0 | |
1256 | #define SK_MEM_RECV 1 | |
1da177e4 | 1257 | |
3ab224be | 1258 | static inline int sk_mem_pages(int amt) |
1da177e4 | 1259 | { |
3ab224be | 1260 | return (amt + SK_MEM_QUANTUM - 1) >> SK_MEM_QUANTUM_SHIFT; |
1da177e4 LT |
1261 | } |
1262 | ||
3ab224be | 1263 | static inline int sk_has_account(struct sock *sk) |
1da177e4 | 1264 | { |
3ab224be HA |
1265 | /* return true if protocol supports memory accounting */ |
1266 | return !!sk->sk_prot->memory_allocated; | |
1da177e4 LT |
1267 | } |
1268 | ||
3ab224be | 1269 | static inline int sk_wmem_schedule(struct sock *sk, int size) |
1da177e4 | 1270 | { |
3ab224be HA |
1271 | if (!sk_has_account(sk)) |
1272 | return 1; | |
1273 | return size <= sk->sk_forward_alloc || | |
1274 | __sk_mem_schedule(sk, size, SK_MEM_SEND); | |
1da177e4 LT |
1275 | } |
1276 | ||
3ab224be | 1277 | static inline int sk_rmem_schedule(struct sock *sk, int size) |
d80d99d6 | 1278 | { |
3ab224be HA |
1279 | if (!sk_has_account(sk)) |
1280 | return 1; | |
d80d99d6 | 1281 | return size <= sk->sk_forward_alloc || |
3ab224be HA |
1282 | __sk_mem_schedule(sk, size, SK_MEM_RECV); |
1283 | } | |
1284 | ||
1285 | static inline void sk_mem_reclaim(struct sock *sk) | |
1286 | { | |
1287 | if (!sk_has_account(sk)) | |
1288 | return; | |
1289 | if (sk->sk_forward_alloc >= SK_MEM_QUANTUM) | |
1290 | __sk_mem_reclaim(sk); | |
1291 | } | |
1292 | ||
9993e7d3 DM |
1293 | static inline void sk_mem_reclaim_partial(struct sock *sk) |
1294 | { | |
1295 | if (!sk_has_account(sk)) | |
1296 | return; | |
1297 | if (sk->sk_forward_alloc > SK_MEM_QUANTUM) | |
1298 | __sk_mem_reclaim(sk); | |
1299 | } | |
1300 | ||
3ab224be HA |
1301 | static inline void sk_mem_charge(struct sock *sk, int size) |
1302 | { | |
1303 | if (!sk_has_account(sk)) | |
1304 | return; | |
1305 | sk->sk_forward_alloc -= size; | |
1306 | } | |
1307 | ||
1308 | static inline void sk_mem_uncharge(struct sock *sk, int size) | |
1309 | { | |
1310 | if (!sk_has_account(sk)) | |
1311 | return; | |
1312 | sk->sk_forward_alloc += size; | |
1313 | } | |
1314 | ||
1315 | static inline void sk_wmem_free_skb(struct sock *sk, struct sk_buff *skb) | |
1316 | { | |
3ab224be HA |
1317 | sock_set_flag(sk, SOCK_QUEUE_SHRUNK); |
1318 | sk->sk_wmem_queued -= skb->truesize; | |
1319 | sk_mem_uncharge(sk, skb->truesize); | |
1320 | __kfree_skb(skb); | |
d80d99d6 HX |
1321 | } |
1322 | ||
1da177e4 LT |
1323 | /* Used by processes to "lock" a socket state, so that |
1324 | * interrupts and bottom half handlers won't change it | |
1325 | * from under us. It essentially blocks any incoming | |
1326 | * packets, so that we won't get any new data or any | |
1327 | * packets that change the state of the socket. | |
1328 | * | |
1329 | * While locked, BH processing will add new packets to | |
1330 | * the backlog queue. This queue is processed by the | |
1331 | * owner of the socket lock right before it is released. | |
1332 | * | |
1333 | * Since ~2.3.5 it is also exclusive sleep lock serializing | |
1334 | * accesses from user process context. | |
1335 | */ | |
d2e9117c | 1336 | #define sock_owned_by_user(sk) ((sk)->sk_lock.owned) |
1da177e4 | 1337 | |
ed07536e PZ |
1338 | /* |
1339 | * Macro so as to not evaluate some arguments when | |
1340 | * lockdep is not enabled. | |
1341 | * | |
1342 | * Mark both the sk_lock and the sk_lock.slock as a | |
1343 | * per-address-family lock class. | |
1344 | */ | |
1345 | #define sock_lock_init_class_and_name(sk, sname, skey, name, key) \ | |
1346 | do { \ | |
e8f6fbf6 | 1347 | sk->sk_lock.owned = 0; \ |
ed07536e PZ |
1348 | init_waitqueue_head(&sk->sk_lock.wq); \ |
1349 | spin_lock_init(&(sk)->sk_lock.slock); \ | |
1350 | debug_check_no_locks_freed((void *)&(sk)->sk_lock, \ | |
1351 | sizeof((sk)->sk_lock)); \ | |
1352 | lockdep_set_class_and_name(&(sk)->sk_lock.slock, \ | |
1353 | (skey), (sname)); \ | |
1354 | lockdep_init_map(&(sk)->sk_lock.dep_map, (name), (key), 0); \ | |
1355 | } while (0) | |
1356 | ||
41380930 | 1357 | extern void lock_sock_nested(struct sock *sk, int subclass); |
fcc70d5f PZ |
1358 | |
1359 | static inline void lock_sock(struct sock *sk) | |
1360 | { | |
1361 | lock_sock_nested(sk, 0); | |
1362 | } | |
1363 | ||
41380930 | 1364 | extern void release_sock(struct sock *sk); |
1da177e4 LT |
1365 | |
1366 | /* BH context may only use the following locking interface. */ | |
1367 | #define bh_lock_sock(__sk) spin_lock(&((__sk)->sk_lock.slock)) | |
c6366184 IM |
1368 | #define bh_lock_sock_nested(__sk) \ |
1369 | spin_lock_nested(&((__sk)->sk_lock.slock), \ | |
1370 | SINGLE_DEPTH_NESTING) | |
1da177e4 LT |
1371 | #define bh_unlock_sock(__sk) spin_unlock(&((__sk)->sk_lock.slock)) |
1372 | ||
8a74ad60 ED |
1373 | extern bool lock_sock_fast(struct sock *sk); |
1374 | /** | |
1375 | * unlock_sock_fast - complement of lock_sock_fast | |
1376 | * @sk: socket | |
1377 | * @slow: slow mode | |
1378 | * | |
1379 | * fast unlock socket for user context. | |
1380 | * If slow mode is on, we call regular release_sock() | |
1381 | */ | |
1382 | static inline void unlock_sock_fast(struct sock *sk, bool slow) | |
4b0b72f7 | 1383 | { |
8a74ad60 ED |
1384 | if (slow) |
1385 | release_sock(sk); | |
1386 | else | |
1387 | spin_unlock_bh(&sk->sk_lock.slock); | |
4b0b72f7 ED |
1388 | } |
1389 | ||
4b0b72f7 | 1390 | |
1b8d7ae4 | 1391 | extern struct sock *sk_alloc(struct net *net, int family, |
dd0fc66f | 1392 | gfp_t priority, |
6257ff21 | 1393 | struct proto *prot); |
1da177e4 | 1394 | extern void sk_free(struct sock *sk); |
edf02087 | 1395 | extern void sk_release_kernel(struct sock *sk); |
e56c57d0 ED |
1396 | extern struct sock *sk_clone_lock(const struct sock *sk, |
1397 | const gfp_t priority); | |
1da177e4 LT |
1398 | |
1399 | extern struct sk_buff *sock_wmalloc(struct sock *sk, | |
1400 | unsigned long size, int force, | |
dd0fc66f | 1401 | gfp_t priority); |
1da177e4 LT |
1402 | extern struct sk_buff *sock_rmalloc(struct sock *sk, |
1403 | unsigned long size, int force, | |
dd0fc66f | 1404 | gfp_t priority); |
1da177e4 LT |
1405 | extern void sock_wfree(struct sk_buff *skb); |
1406 | extern void sock_rfree(struct sk_buff *skb); | |
1407 | ||
1408 | extern int sock_setsockopt(struct socket *sock, int level, | |
1409 | int op, char __user *optval, | |
b7058842 | 1410 | unsigned int optlen); |
1da177e4 LT |
1411 | |
1412 | extern int sock_getsockopt(struct socket *sock, int level, | |
1413 | int op, char __user *optval, | |
1414 | int __user *optlen); | |
1415 | extern struct sk_buff *sock_alloc_send_skb(struct sock *sk, | |
1416 | unsigned long size, | |
1417 | int noblock, | |
1418 | int *errcode); | |
4cc7f68d HX |
1419 | extern struct sk_buff *sock_alloc_send_pskb(struct sock *sk, |
1420 | unsigned long header_len, | |
1421 | unsigned long data_len, | |
1422 | int noblock, | |
1423 | int *errcode); | |
86a76caf | 1424 | extern void *sock_kmalloc(struct sock *sk, int size, |
dd0fc66f | 1425 | gfp_t priority); |
1da177e4 LT |
1426 | extern void sock_kfree_s(struct sock *sk, void *mem, int size); |
1427 | extern void sk_send_sigurg(struct sock *sk); | |
1428 | ||
f8451725 HX |
1429 | #ifdef CONFIG_CGROUPS |
1430 | extern void sock_update_classid(struct sock *sk); | |
1431 | #else | |
1432 | static inline void sock_update_classid(struct sock *sk) | |
1433 | { | |
1434 | } | |
1435 | #endif | |
1436 | ||
1da177e4 LT |
1437 | /* |
1438 | * Functions to fill in entries in struct proto_ops when a protocol | |
1439 | * does not implement a particular function. | |
1440 | */ | |
1441 | extern int sock_no_bind(struct socket *, | |
1442 | struct sockaddr *, int); | |
1443 | extern int sock_no_connect(struct socket *, | |
1444 | struct sockaddr *, int, int); | |
1445 | extern int sock_no_socketpair(struct socket *, | |
1446 | struct socket *); | |
1447 | extern int sock_no_accept(struct socket *, | |
1448 | struct socket *, int); | |
1449 | extern int sock_no_getname(struct socket *, | |
1450 | struct sockaddr *, int *, int); | |
1451 | extern unsigned int sock_no_poll(struct file *, struct socket *, | |
1452 | struct poll_table_struct *); | |
1453 | extern int sock_no_ioctl(struct socket *, unsigned int, | |
1454 | unsigned long); | |
1455 | extern int sock_no_listen(struct socket *, int); | |
1456 | extern int sock_no_shutdown(struct socket *, int); | |
1457 | extern int sock_no_getsockopt(struct socket *, int , int, | |
1458 | char __user *, int __user *); | |
1459 | extern int sock_no_setsockopt(struct socket *, int, int, | |
b7058842 | 1460 | char __user *, unsigned int); |
1da177e4 LT |
1461 | extern int sock_no_sendmsg(struct kiocb *, struct socket *, |
1462 | struct msghdr *, size_t); | |
1463 | extern int sock_no_recvmsg(struct kiocb *, struct socket *, | |
1464 | struct msghdr *, size_t, int); | |
1465 | extern int sock_no_mmap(struct file *file, | |
1466 | struct socket *sock, | |
1467 | struct vm_area_struct *vma); | |
1468 | extern ssize_t sock_no_sendpage(struct socket *sock, | |
1469 | struct page *page, | |
1470 | int offset, size_t size, | |
1471 | int flags); | |
1472 | ||
1473 | /* | |
1474 | * Functions to fill in entries in struct proto_ops when a protocol | |
1475 | * uses the inet style. | |
1476 | */ | |
1477 | extern int sock_common_getsockopt(struct socket *sock, int level, int optname, | |
1478 | char __user *optval, int __user *optlen); | |
1479 | extern int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock, | |
1480 | struct msghdr *msg, size_t size, int flags); | |
1481 | extern int sock_common_setsockopt(struct socket *sock, int level, int optname, | |
b7058842 | 1482 | char __user *optval, unsigned int optlen); |
3fdadf7d DM |
1483 | extern int compat_sock_common_getsockopt(struct socket *sock, int level, |
1484 | int optname, char __user *optval, int __user *optlen); | |
1485 | extern int compat_sock_common_setsockopt(struct socket *sock, int level, | |
b7058842 | 1486 | int optname, char __user *optval, unsigned int optlen); |
1da177e4 LT |
1487 | |
1488 | extern void sk_common_release(struct sock *sk); | |
1489 | ||
1490 | /* | |
1491 | * Default socket callbacks and setup code | |
1492 | */ | |
1493 | ||
1494 | /* Initialise core socket variables */ | |
1495 | extern void sock_init_data(struct socket *sock, struct sock *sk); | |
1496 | ||
46bcf14f ED |
1497 | extern void sk_filter_release_rcu(struct rcu_head *rcu); |
1498 | ||
dc9b3346 | 1499 | /** |
1a5778aa | 1500 | * sk_filter_release - release a socket filter |
dc9b3346 PB |
1501 | * @fp: filter to remove |
1502 | * | |
1503 | * Remove a filter from a socket and release its resources. | |
1504 | */ | |
1505 | ||
309dd5fc PE |
1506 | static inline void sk_filter_release(struct sk_filter *fp) |
1507 | { | |
1508 | if (atomic_dec_and_test(&fp->refcnt)) | |
80f8f102 | 1509 | call_rcu(&fp->rcu, sk_filter_release_rcu); |
309dd5fc PE |
1510 | } |
1511 | ||
1512 | static inline void sk_filter_uncharge(struct sock *sk, struct sk_filter *fp) | |
1da177e4 LT |
1513 | { |
1514 | unsigned int size = sk_filter_len(fp); | |
1515 | ||
1516 | atomic_sub(size, &sk->sk_omem_alloc); | |
309dd5fc | 1517 | sk_filter_release(fp); |
1da177e4 LT |
1518 | } |
1519 | ||
1520 | static inline void sk_filter_charge(struct sock *sk, struct sk_filter *fp) | |
1521 | { | |
1522 | atomic_inc(&fp->refcnt); | |
1523 | atomic_add(sk_filter_len(fp), &sk->sk_omem_alloc); | |
1524 | } | |
1525 | ||
1526 | /* | |
1527 | * Socket reference counting postulates. | |
1528 | * | |
1529 | * * Each user of socket SHOULD hold a reference count. | |
1530 | * * Each access point to socket (an hash table bucket, reference from a list, | |
1531 | * running timer, skb in flight MUST hold a reference count. | |
1532 | * * When reference count hits 0, it means it will never increase back. | |
1533 | * * When reference count hits 0, it means that no references from | |
1534 | * outside exist to this socket and current process on current CPU | |
1535 | * is last user and may/should destroy this socket. | |
1536 | * * sk_free is called from any context: process, BH, IRQ. When | |
1537 | * it is called, socket has no references from outside -> sk_free | |
1538 | * may release descendant resources allocated by the socket, but | |
1539 | * to the time when it is called, socket is NOT referenced by any | |
1540 | * hash tables, lists etc. | |
1541 | * * Packets, delivered from outside (from network or from another process) | |
1542 | * and enqueued on receive/error queues SHOULD NOT grab reference count, | |
1543 | * when they sit in queue. Otherwise, packets will leak to hole, when | |
1544 | * socket is looked up by one cpu and unhasing is made by another CPU. | |
1545 | * It is true for udp/raw, netlink (leak to receive and error queues), tcp | |
1546 | * (leak to backlog). Packet socket does all the processing inside | |
1547 | * BR_NETPROTO_LOCK, so that it has not this race condition. UNIX sockets | |
1548 | * use separate SMP lock, so that they are prone too. | |
1549 | */ | |
1550 | ||
1551 | /* Ungrab socket and destroy it, if it was the last reference. */ | |
1552 | static inline void sock_put(struct sock *sk) | |
1553 | { | |
1554 | if (atomic_dec_and_test(&sk->sk_refcnt)) | |
1555 | sk_free(sk); | |
1556 | } | |
1557 | ||
58a5a7b9 ACM |
1558 | extern int sk_receive_skb(struct sock *sk, struct sk_buff *skb, |
1559 | const int nested); | |
25995ff5 | 1560 | |
e022f0b4 KK |
1561 | static inline void sk_tx_queue_set(struct sock *sk, int tx_queue) |
1562 | { | |
1563 | sk->sk_tx_queue_mapping = tx_queue; | |
1564 | } | |
1565 | ||
1566 | static inline void sk_tx_queue_clear(struct sock *sk) | |
1567 | { | |
1568 | sk->sk_tx_queue_mapping = -1; | |
1569 | } | |
1570 | ||
1571 | static inline int sk_tx_queue_get(const struct sock *sk) | |
1572 | { | |
b0f77d0e | 1573 | return sk ? sk->sk_tx_queue_mapping : -1; |
e022f0b4 KK |
1574 | } |
1575 | ||
972692e0 DM |
1576 | static inline void sk_set_socket(struct sock *sk, struct socket *sock) |
1577 | { | |
e022f0b4 | 1578 | sk_tx_queue_clear(sk); |
972692e0 DM |
1579 | sk->sk_socket = sock; |
1580 | } | |
1581 | ||
aa395145 ED |
1582 | static inline wait_queue_head_t *sk_sleep(struct sock *sk) |
1583 | { | |
eaefd110 ED |
1584 | BUILD_BUG_ON(offsetof(struct socket_wq, wait) != 0); |
1585 | return &rcu_dereference_raw(sk->sk_wq)->wait; | |
aa395145 | 1586 | } |
1da177e4 LT |
1587 | /* Detach socket from process context. |
1588 | * Announce socket dead, detach it from wait queue and inode. | |
1589 | * Note that parent inode held reference count on this struct sock, | |
1590 | * we do not release it in this function, because protocol | |
1591 | * probably wants some additional cleanups or even continuing | |
1592 | * to work with this socket (TCP). | |
1593 | */ | |
1594 | static inline void sock_orphan(struct sock *sk) | |
1595 | { | |
1596 | write_lock_bh(&sk->sk_callback_lock); | |
1597 | sock_set_flag(sk, SOCK_DEAD); | |
972692e0 | 1598 | sk_set_socket(sk, NULL); |
43815482 | 1599 | sk->sk_wq = NULL; |
1da177e4 LT |
1600 | write_unlock_bh(&sk->sk_callback_lock); |
1601 | } | |
1602 | ||
1603 | static inline void sock_graft(struct sock *sk, struct socket *parent) | |
1604 | { | |
1605 | write_lock_bh(&sk->sk_callback_lock); | |
eaefd110 | 1606 | sk->sk_wq = parent->wq; |
1da177e4 | 1607 | parent->sk = sk; |
972692e0 | 1608 | sk_set_socket(sk, parent); |
4237c75c | 1609 | security_sock_graft(sk, parent); |
1da177e4 LT |
1610 | write_unlock_bh(&sk->sk_callback_lock); |
1611 | } | |
1612 | ||
1613 | extern int sock_i_uid(struct sock *sk); | |
1614 | extern unsigned long sock_i_ino(struct sock *sk); | |
1615 | ||
1616 | static inline struct dst_entry * | |
1617 | __sk_dst_get(struct sock *sk) | |
1618 | { | |
d8bf4ca9 | 1619 | return rcu_dereference_check(sk->sk_dst_cache, sock_owned_by_user(sk) || |
f68c224f | 1620 | lockdep_is_held(&sk->sk_lock.slock)); |
1da177e4 LT |
1621 | } |
1622 | ||
1623 | static inline struct dst_entry * | |
1624 | sk_dst_get(struct sock *sk) | |
1625 | { | |
1626 | struct dst_entry *dst; | |
1627 | ||
b6c6712a ED |
1628 | rcu_read_lock(); |
1629 | dst = rcu_dereference(sk->sk_dst_cache); | |
1da177e4 LT |
1630 | if (dst) |
1631 | dst_hold(dst); | |
b6c6712a | 1632 | rcu_read_unlock(); |
1da177e4 LT |
1633 | return dst; |
1634 | } | |
1635 | ||
b6c6712a ED |
1636 | extern void sk_reset_txq(struct sock *sk); |
1637 | ||
1638 | static inline void dst_negative_advice(struct sock *sk) | |
1639 | { | |
1640 | struct dst_entry *ndst, *dst = __sk_dst_get(sk); | |
1641 | ||
1642 | if (dst && dst->ops->negative_advice) { | |
1643 | ndst = dst->ops->negative_advice(dst); | |
1644 | ||
1645 | if (ndst != dst) { | |
1646 | rcu_assign_pointer(sk->sk_dst_cache, ndst); | |
1647 | sk_reset_txq(sk); | |
1648 | } | |
1649 | } | |
1650 | } | |
1651 | ||
1da177e4 LT |
1652 | static inline void |
1653 | __sk_dst_set(struct sock *sk, struct dst_entry *dst) | |
1654 | { | |
1655 | struct dst_entry *old_dst; | |
1656 | ||
e022f0b4 | 1657 | sk_tx_queue_clear(sk); |
0b53ff2e ED |
1658 | /* |
1659 | * This can be called while sk is owned by the caller only, | |
1660 | * with no state that can be checked in a rcu_dereference_check() cond | |
1661 | */ | |
1662 | old_dst = rcu_dereference_raw(sk->sk_dst_cache); | |
b6c6712a | 1663 | rcu_assign_pointer(sk->sk_dst_cache, dst); |
1da177e4 LT |
1664 | dst_release(old_dst); |
1665 | } | |
1666 | ||
1667 | static inline void | |
1668 | sk_dst_set(struct sock *sk, struct dst_entry *dst) | |
1669 | { | |
b6c6712a | 1670 | spin_lock(&sk->sk_dst_lock); |
1da177e4 | 1671 | __sk_dst_set(sk, dst); |
b6c6712a | 1672 | spin_unlock(&sk->sk_dst_lock); |
1da177e4 LT |
1673 | } |
1674 | ||
1675 | static inline void | |
1676 | __sk_dst_reset(struct sock *sk) | |
1677 | { | |
b6c6712a | 1678 | __sk_dst_set(sk, NULL); |
1da177e4 LT |
1679 | } |
1680 | ||
1681 | static inline void | |
1682 | sk_dst_reset(struct sock *sk) | |
1683 | { | |
b6c6712a | 1684 | spin_lock(&sk->sk_dst_lock); |
1da177e4 | 1685 | __sk_dst_reset(sk); |
b6c6712a | 1686 | spin_unlock(&sk->sk_dst_lock); |
1da177e4 LT |
1687 | } |
1688 | ||
f0088a50 | 1689 | extern struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie); |
1da177e4 | 1690 | |
f0088a50 | 1691 | extern struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie); |
1da177e4 | 1692 | |
bcd76111 HX |
1693 | static inline int sk_can_gso(const struct sock *sk) |
1694 | { | |
1695 | return net_gso_ok(sk->sk_route_caps, sk->sk_gso_type); | |
1696 | } | |
1697 | ||
9958089a | 1698 | extern void sk_setup_caps(struct sock *sk, struct dst_entry *dst); |
6cbb0df7 | 1699 | |
c8f44aff | 1700 | static inline void sk_nocaps_add(struct sock *sk, netdev_features_t flags) |
a465419b ED |
1701 | { |
1702 | sk->sk_route_nocaps |= flags; | |
1703 | sk->sk_route_caps &= ~flags; | |
1704 | } | |
1705 | ||
c6e1a0d1 TH |
1706 | static inline int skb_do_copy_data_nocache(struct sock *sk, struct sk_buff *skb, |
1707 | char __user *from, char *to, | |
912d398d | 1708 | int copy, int offset) |
c6e1a0d1 TH |
1709 | { |
1710 | if (skb->ip_summed == CHECKSUM_NONE) { | |
1711 | int err = 0; | |
1712 | __wsum csum = csum_and_copy_from_user(from, to, copy, 0, &err); | |
1713 | if (err) | |
1714 | return err; | |
912d398d | 1715 | skb->csum = csum_block_add(skb->csum, csum, offset); |
c6e1a0d1 TH |
1716 | } else if (sk->sk_route_caps & NETIF_F_NOCACHE_COPY) { |
1717 | if (!access_ok(VERIFY_READ, from, copy) || | |
1718 | __copy_from_user_nocache(to, from, copy)) | |
1719 | return -EFAULT; | |
1720 | } else if (copy_from_user(to, from, copy)) | |
1721 | return -EFAULT; | |
1722 | ||
1723 | return 0; | |
1724 | } | |
1725 | ||
1726 | static inline int skb_add_data_nocache(struct sock *sk, struct sk_buff *skb, | |
1727 | char __user *from, int copy) | |
1728 | { | |
912d398d | 1729 | int err, offset = skb->len; |
c6e1a0d1 | 1730 | |
912d398d WY |
1731 | err = skb_do_copy_data_nocache(sk, skb, from, skb_put(skb, copy), |
1732 | copy, offset); | |
c6e1a0d1 | 1733 | if (err) |
912d398d | 1734 | __skb_trim(skb, offset); |
c6e1a0d1 TH |
1735 | |
1736 | return err; | |
1737 | } | |
1738 | ||
1739 | static inline int skb_copy_to_page_nocache(struct sock *sk, char __user *from, | |
1740 | struct sk_buff *skb, | |
1741 | struct page *page, | |
1742 | int off, int copy) | |
1743 | { | |
1744 | int err; | |
1745 | ||
912d398d WY |
1746 | err = skb_do_copy_data_nocache(sk, skb, from, page_address(page) + off, |
1747 | copy, skb->len); | |
c6e1a0d1 TH |
1748 | if (err) |
1749 | return err; | |
1750 | ||
1751 | skb->len += copy; | |
1752 | skb->data_len += copy; | |
1753 | skb->truesize += copy; | |
1754 | sk->sk_wmem_queued += copy; | |
1755 | sk_mem_charge(sk, copy); | |
1756 | return 0; | |
1757 | } | |
1758 | ||
1da177e4 LT |
1759 | static inline int skb_copy_to_page(struct sock *sk, char __user *from, |
1760 | struct sk_buff *skb, struct page *page, | |
1761 | int off, int copy) | |
1762 | { | |
1763 | if (skb->ip_summed == CHECKSUM_NONE) { | |
1764 | int err = 0; | |
5084205f | 1765 | __wsum csum = csum_and_copy_from_user(from, |
1da177e4 LT |
1766 | page_address(page) + off, |
1767 | copy, 0, &err); | |
1768 | if (err) | |
1769 | return err; | |
1770 | skb->csum = csum_block_add(skb->csum, csum, skb->len); | |
1771 | } else if (copy_from_user(page_address(page) + off, from, copy)) | |
1772 | return -EFAULT; | |
1773 | ||
1774 | skb->len += copy; | |
1775 | skb->data_len += copy; | |
1776 | skb->truesize += copy; | |
1777 | sk->sk_wmem_queued += copy; | |
3ab224be | 1778 | sk_mem_charge(sk, copy); |
1da177e4 LT |
1779 | return 0; |
1780 | } | |
1781 | ||
c564039f ED |
1782 | /** |
1783 | * sk_wmem_alloc_get - returns write allocations | |
1784 | * @sk: socket | |
1785 | * | |
1786 | * Returns sk_wmem_alloc minus initial offset of one | |
1787 | */ | |
1788 | static inline int sk_wmem_alloc_get(const struct sock *sk) | |
1789 | { | |
1790 | return atomic_read(&sk->sk_wmem_alloc) - 1; | |
1791 | } | |
1792 | ||
1793 | /** | |
1794 | * sk_rmem_alloc_get - returns read allocations | |
1795 | * @sk: socket | |
1796 | * | |
1797 | * Returns sk_rmem_alloc | |
1798 | */ | |
1799 | static inline int sk_rmem_alloc_get(const struct sock *sk) | |
1800 | { | |
1801 | return atomic_read(&sk->sk_rmem_alloc); | |
1802 | } | |
1803 | ||
1804 | /** | |
1805 | * sk_has_allocations - check if allocations are outstanding | |
1806 | * @sk: socket | |
1807 | * | |
1808 | * Returns true if socket has write or read allocations | |
1809 | */ | |
1810 | static inline int sk_has_allocations(const struct sock *sk) | |
1811 | { | |
1812 | return sk_wmem_alloc_get(sk) || sk_rmem_alloc_get(sk); | |
1813 | } | |
1814 | ||
a57de0b4 | 1815 | /** |
43815482 | 1816 | * wq_has_sleeper - check if there are any waiting processes |
acfbe96a | 1817 | * @wq: struct socket_wq |
a57de0b4 | 1818 | * |
43815482 | 1819 | * Returns true if socket_wq has waiting processes |
a57de0b4 | 1820 | * |
43815482 | 1821 | * The purpose of the wq_has_sleeper and sock_poll_wait is to wrap the memory |
a57de0b4 JO |
1822 | * barrier call. They were added due to the race found within the tcp code. |
1823 | * | |
1824 | * Consider following tcp code paths: | |
1825 | * | |
1826 | * CPU1 CPU2 | |
1827 | * | |
1828 | * sys_select receive packet | |
1829 | * ... ... | |
1830 | * __add_wait_queue update tp->rcv_nxt | |
1831 | * ... ... | |
1832 | * tp->rcv_nxt check sock_def_readable | |
1833 | * ... { | |
43815482 ED |
1834 | * schedule rcu_read_lock(); |
1835 | * wq = rcu_dereference(sk->sk_wq); | |
1836 | * if (wq && waitqueue_active(&wq->wait)) | |
1837 | * wake_up_interruptible(&wq->wait) | |
a57de0b4 JO |
1838 | * ... |
1839 | * } | |
1840 | * | |
1841 | * The race for tcp fires when the __add_wait_queue changes done by CPU1 stay | |
1842 | * in its cache, and so does the tp->rcv_nxt update on CPU2 side. The CPU1 | |
1843 | * could then endup calling schedule and sleep forever if there are no more | |
1844 | * data on the socket. | |
ad462769 | 1845 | * |
a57de0b4 | 1846 | */ |
43815482 | 1847 | static inline bool wq_has_sleeper(struct socket_wq *wq) |
a57de0b4 | 1848 | { |
43815482 | 1849 | |
a57de0b4 JO |
1850 | /* |
1851 | * We need to be sure we are in sync with the | |
1852 | * add_wait_queue modifications to the wait queue. | |
1853 | * | |
1854 | * This memory barrier is paired in the sock_poll_wait. | |
1855 | */ | |
43815482 ED |
1856 | smp_mb(); |
1857 | return wq && waitqueue_active(&wq->wait); | |
a57de0b4 JO |
1858 | } |
1859 | ||
1860 | /** | |
1861 | * sock_poll_wait - place memory barrier behind the poll_wait call. | |
1862 | * @filp: file | |
1863 | * @wait_address: socket wait queue | |
1864 | * @p: poll_table | |
1865 | * | |
43815482 | 1866 | * See the comments in the wq_has_sleeper function. |
a57de0b4 JO |
1867 | */ |
1868 | static inline void sock_poll_wait(struct file *filp, | |
1869 | wait_queue_head_t *wait_address, poll_table *p) | |
1870 | { | |
626cf236 | 1871 | if (!poll_does_not_wait(p) && wait_address) { |
a57de0b4 JO |
1872 | poll_wait(filp, wait_address, p); |
1873 | /* | |
1874 | * We need to be sure we are in sync with the | |
1875 | * socket flags modification. | |
1876 | * | |
43815482 | 1877 | * This memory barrier is paired in the wq_has_sleeper. |
a57de0b4 JO |
1878 | */ |
1879 | smp_mb(); | |
1880 | } | |
1881 | } | |
1882 | ||
1da177e4 LT |
1883 | /* |
1884 | * Queue a received datagram if it will fit. Stream and sequenced | |
1885 | * protocols can't normally use this as they need to fit buffers in | |
1886 | * and play with them. | |
1887 | * | |
1888 | * Inlined as it's very short and called for pretty much every | |
1889 | * packet ever received. | |
1890 | */ | |
1891 | ||
1892 | static inline void skb_set_owner_w(struct sk_buff *skb, struct sock *sk) | |
1893 | { | |
d55d87fd | 1894 | skb_orphan(skb); |
1da177e4 LT |
1895 | skb->sk = sk; |
1896 | skb->destructor = sock_wfree; | |
2b85a34e ED |
1897 | /* |
1898 | * We used to take a refcount on sk, but following operation | |
1899 | * is enough to guarantee sk_free() wont free this sock until | |
1900 | * all in-flight packets are completed | |
1901 | */ | |
1da177e4 LT |
1902 | atomic_add(skb->truesize, &sk->sk_wmem_alloc); |
1903 | } | |
1904 | ||
1905 | static inline void skb_set_owner_r(struct sk_buff *skb, struct sock *sk) | |
1906 | { | |
d55d87fd | 1907 | skb_orphan(skb); |
1da177e4 LT |
1908 | skb->sk = sk; |
1909 | skb->destructor = sock_rfree; | |
1910 | atomic_add(skb->truesize, &sk->sk_rmem_alloc); | |
3ab224be | 1911 | sk_mem_charge(sk, skb->truesize); |
1da177e4 LT |
1912 | } |
1913 | ||
1914 | extern void sk_reset_timer(struct sock *sk, struct timer_list* timer, | |
1915 | unsigned long expires); | |
1916 | ||
1917 | extern void sk_stop_timer(struct sock *sk, struct timer_list* timer); | |
1918 | ||
f0088a50 | 1919 | extern int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb); |
1da177e4 | 1920 | |
b1faf566 | 1921 | extern int sock_queue_err_skb(struct sock *sk, struct sk_buff *skb); |
1da177e4 LT |
1922 | |
1923 | /* | |
1924 | * Recover an error report and clear atomically | |
1925 | */ | |
1926 | ||
1927 | static inline int sock_error(struct sock *sk) | |
1928 | { | |
c1cbe4b7 BL |
1929 | int err; |
1930 | if (likely(!sk->sk_err)) | |
1931 | return 0; | |
1932 | err = xchg(&sk->sk_err, 0); | |
1da177e4 LT |
1933 | return -err; |
1934 | } | |
1935 | ||
1936 | static inline unsigned long sock_wspace(struct sock *sk) | |
1937 | { | |
1938 | int amt = 0; | |
1939 | ||
1940 | if (!(sk->sk_shutdown & SEND_SHUTDOWN)) { | |
1941 | amt = sk->sk_sndbuf - atomic_read(&sk->sk_wmem_alloc); | |
1942 | if (amt < 0) | |
1943 | amt = 0; | |
1944 | } | |
1945 | return amt; | |
1946 | } | |
1947 | ||
1948 | static inline void sk_wake_async(struct sock *sk, int how, int band) | |
1949 | { | |
bcdce719 | 1950 | if (sock_flag(sk, SOCK_FASYNC)) |
1da177e4 LT |
1951 | sock_wake_async(sk->sk_socket, how, band); |
1952 | } | |
1953 | ||
1954 | #define SOCK_MIN_SNDBUF 2048 | |
7a91b434 ED |
1955 | /* |
1956 | * Since sk_rmem_alloc sums skb->truesize, even a small frame might need | |
1957 | * sizeof(sk_buff) + MTU + padding, unless net driver perform copybreak | |
1958 | */ | |
1959 | #define SOCK_MIN_RCVBUF (2048 + sizeof(struct sk_buff)) | |
1da177e4 LT |
1960 | |
1961 | static inline void sk_stream_moderate_sndbuf(struct sock *sk) | |
1962 | { | |
1963 | if (!(sk->sk_userlocks & SOCK_SNDBUF_LOCK)) { | |
8df09ea3 | 1964 | sk->sk_sndbuf = min(sk->sk_sndbuf, sk->sk_wmem_queued >> 1); |
1da177e4 LT |
1965 | sk->sk_sndbuf = max(sk->sk_sndbuf, SOCK_MIN_SNDBUF); |
1966 | } | |
1967 | } | |
1968 | ||
df97c708 | 1969 | struct sk_buff *sk_stream_alloc_skb(struct sock *sk, int size, gfp_t gfp); |
1da177e4 LT |
1970 | |
1971 | static inline struct page *sk_stream_alloc_page(struct sock *sk) | |
1972 | { | |
1973 | struct page *page = NULL; | |
1974 | ||
ef015786 HX |
1975 | page = alloc_pages(sk->sk_allocation, 0); |
1976 | if (!page) { | |
180d8cd9 | 1977 | sk_enter_memory_pressure(sk); |
1da177e4 LT |
1978 | sk_stream_moderate_sndbuf(sk); |
1979 | } | |
1980 | return page; | |
1981 | } | |
1982 | ||
1da177e4 LT |
1983 | /* |
1984 | * Default write policy as shown to user space via poll/select/SIGIO | |
1985 | */ | |
1986 | static inline int sock_writeable(const struct sock *sk) | |
1987 | { | |
8df09ea3 | 1988 | return atomic_read(&sk->sk_wmem_alloc) < (sk->sk_sndbuf >> 1); |
1da177e4 LT |
1989 | } |
1990 | ||
dd0fc66f | 1991 | static inline gfp_t gfp_any(void) |
1da177e4 | 1992 | { |
99709372 | 1993 | return in_softirq() ? GFP_ATOMIC : GFP_KERNEL; |
1da177e4 LT |
1994 | } |
1995 | ||
1996 | static inline long sock_rcvtimeo(const struct sock *sk, int noblock) | |
1997 | { | |
1998 | return noblock ? 0 : sk->sk_rcvtimeo; | |
1999 | } | |
2000 | ||
2001 | static inline long sock_sndtimeo(const struct sock *sk, int noblock) | |
2002 | { | |
2003 | return noblock ? 0 : sk->sk_sndtimeo; | |
2004 | } | |
2005 | ||
2006 | static inline int sock_rcvlowat(const struct sock *sk, int waitall, int len) | |
2007 | { | |
2008 | return (waitall ? len : min_t(int, sk->sk_rcvlowat, len)) ? : 1; | |
2009 | } | |
2010 | ||
2011 | /* Alas, with timeout socket operations are not restartable. | |
2012 | * Compare this to poll(). | |
2013 | */ | |
2014 | static inline int sock_intr_errno(long timeo) | |
2015 | { | |
2016 | return timeo == MAX_SCHEDULE_TIMEOUT ? -ERESTARTSYS : -EINTR; | |
2017 | } | |
2018 | ||
92f37fd2 ED |
2019 | extern void __sock_recv_timestamp(struct msghdr *msg, struct sock *sk, |
2020 | struct sk_buff *skb); | |
6e3e939f JB |
2021 | extern void __sock_recv_wifi_status(struct msghdr *msg, struct sock *sk, |
2022 | struct sk_buff *skb); | |
92f37fd2 | 2023 | |
1da177e4 LT |
2024 | static __inline__ void |
2025 | sock_recv_timestamp(struct msghdr *msg, struct sock *sk, struct sk_buff *skb) | |
2026 | { | |
b7aa0bf7 | 2027 | ktime_t kt = skb->tstamp; |
20d49473 | 2028 | struct skb_shared_hwtstamps *hwtstamps = skb_hwtstamps(skb); |
a61bbcf2 | 2029 | |
20d49473 PO |
2030 | /* |
2031 | * generate control messages if | |
2032 | * - receive time stamping in software requested (SOCK_RCVTSTAMP | |
2033 | * or SOCK_TIMESTAMPING_RX_SOFTWARE) | |
2034 | * - software time stamp available and wanted | |
2035 | * (SOCK_TIMESTAMPING_SOFTWARE) | |
2036 | * - hardware time stamps available and wanted | |
2037 | * (SOCK_TIMESTAMPING_SYS_HARDWARE or | |
2038 | * SOCK_TIMESTAMPING_RAW_HARDWARE) | |
2039 | */ | |
2040 | if (sock_flag(sk, SOCK_RCVTSTAMP) || | |
2041 | sock_flag(sk, SOCK_TIMESTAMPING_RX_SOFTWARE) || | |
2042 | (kt.tv64 && sock_flag(sk, SOCK_TIMESTAMPING_SOFTWARE)) || | |
2043 | (hwtstamps->hwtstamp.tv64 && | |
2044 | sock_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE)) || | |
2045 | (hwtstamps->syststamp.tv64 && | |
2046 | sock_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE))) | |
92f37fd2 ED |
2047 | __sock_recv_timestamp(msg, sk, skb); |
2048 | else | |
b7aa0bf7 | 2049 | sk->sk_stamp = kt; |
6e3e939f JB |
2050 | |
2051 | if (sock_flag(sk, SOCK_WIFI_STATUS) && skb->wifi_acked_valid) | |
2052 | __sock_recv_wifi_status(msg, sk, skb); | |
1da177e4 LT |
2053 | } |
2054 | ||
767dd033 ED |
2055 | extern void __sock_recv_ts_and_drops(struct msghdr *msg, struct sock *sk, |
2056 | struct sk_buff *skb); | |
2057 | ||
2058 | static inline void sock_recv_ts_and_drops(struct msghdr *msg, struct sock *sk, | |
2059 | struct sk_buff *skb) | |
2060 | { | |
2061 | #define FLAGS_TS_OR_DROPS ((1UL << SOCK_RXQ_OVFL) | \ | |
2062 | (1UL << SOCK_RCVTSTAMP) | \ | |
2063 | (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE) | \ | |
2064 | (1UL << SOCK_TIMESTAMPING_SOFTWARE) | \ | |
2065 | (1UL << SOCK_TIMESTAMPING_RAW_HARDWARE) | \ | |
2066 | (1UL << SOCK_TIMESTAMPING_SYS_HARDWARE)) | |
2067 | ||
2068 | if (sk->sk_flags & FLAGS_TS_OR_DROPS) | |
2069 | __sock_recv_ts_and_drops(msg, sk, skb); | |
2070 | else | |
2071 | sk->sk_stamp = skb->tstamp; | |
2072 | } | |
3b885787 | 2073 | |
20d49473 PO |
2074 | /** |
2075 | * sock_tx_timestamp - checks whether the outgoing packet is to be time stamped | |
20d49473 | 2076 | * @sk: socket sending this packet |
2244d07b | 2077 | * @tx_flags: filled with instructions for time stamping |
20d49473 PO |
2078 | * |
2079 | * Currently only depends on SOCK_TIMESTAMPING* flags. Returns error code if | |
2080 | * parameters are invalid. | |
2081 | */ | |
2244d07b | 2082 | extern int sock_tx_timestamp(struct sock *sk, __u8 *tx_flags); |
20d49473 | 2083 | |
1da177e4 LT |
2084 | /** |
2085 | * sk_eat_skb - Release a skb if it is no longer needed | |
4dc3b16b PP |
2086 | * @sk: socket to eat this skb from |
2087 | * @skb: socket buffer to eat | |
f4b8ea78 | 2088 | * @copied_early: flag indicating whether DMA operations copied this data early |
1da177e4 LT |
2089 | * |
2090 | * This routine must be called with interrupts disabled or with the socket | |
2091 | * locked so that the sk_buff queue operation is ok. | |
2092 | */ | |
624d1164 CL |
2093 | #ifdef CONFIG_NET_DMA |
2094 | static inline void sk_eat_skb(struct sock *sk, struct sk_buff *skb, int copied_early) | |
2095 | { | |
2096 | __skb_unlink(skb, &sk->sk_receive_queue); | |
2097 | if (!copied_early) | |
2098 | __kfree_skb(skb); | |
2099 | else | |
2100 | __skb_queue_tail(&sk->sk_async_wait_queue, skb); | |
2101 | } | |
2102 | #else | |
2103 | static inline void sk_eat_skb(struct sock *sk, struct sk_buff *skb, int copied_early) | |
1da177e4 LT |
2104 | { |
2105 | __skb_unlink(skb, &sk->sk_receive_queue); | |
2106 | __kfree_skb(skb); | |
2107 | } | |
624d1164 | 2108 | #endif |
1da177e4 | 2109 | |
3b1e0a65 YH |
2110 | static inline |
2111 | struct net *sock_net(const struct sock *sk) | |
2112 | { | |
c2d9ba9b | 2113 | return read_pnet(&sk->sk_net); |
3b1e0a65 YH |
2114 | } |
2115 | ||
2116 | static inline | |
f5aa23fd | 2117 | void sock_net_set(struct sock *sk, struct net *net) |
3b1e0a65 | 2118 | { |
c2d9ba9b | 2119 | write_pnet(&sk->sk_net, net); |
3b1e0a65 YH |
2120 | } |
2121 | ||
edf02087 DL |
2122 | /* |
2123 | * Kernel sockets, f.e. rtnl or icmp_socket, are a part of a namespace. | |
25985edc | 2124 | * They should not hold a reference to a namespace in order to allow |
edf02087 DL |
2125 | * to stop it. |
2126 | * Sockets after sk_change_net should be released using sk_release_kernel | |
2127 | */ | |
2128 | static inline void sk_change_net(struct sock *sk, struct net *net) | |
2129 | { | |
3b1e0a65 | 2130 | put_net(sock_net(sk)); |
65a18ec5 | 2131 | sock_net_set(sk, hold_net(net)); |
edf02087 DL |
2132 | } |
2133 | ||
23542618 KK |
2134 | static inline struct sock *skb_steal_sock(struct sk_buff *skb) |
2135 | { | |
2136 | if (unlikely(skb->sk)) { | |
2137 | struct sock *sk = skb->sk; | |
2138 | ||
2139 | skb->destructor = NULL; | |
2140 | skb->sk = NULL; | |
2141 | return sk; | |
2142 | } | |
2143 | return NULL; | |
2144 | } | |
2145 | ||
20d49473 | 2146 | extern void sock_enable_timestamp(struct sock *sk, int flag); |
1da177e4 | 2147 | extern int sock_get_timestamp(struct sock *, struct timeval __user *); |
ae40eb1e | 2148 | extern int sock_get_timestampns(struct sock *, struct timespec __user *); |
1da177e4 LT |
2149 | |
2150 | /* | |
2151 | * Enable debug/info messages | |
2152 | */ | |
a2a316fd SH |
2153 | extern int net_msg_warn; |
2154 | #define NETDEBUG(fmt, args...) \ | |
2155 | do { if (net_msg_warn) printk(fmt,##args); } while (0) | |
1da177e4 | 2156 | |
a2a316fd SH |
2157 | #define LIMIT_NETDEBUG(fmt, args...) \ |
2158 | do { if (net_msg_warn && net_ratelimit()) printk(fmt,##args); } while(0) | |
1da177e4 | 2159 | |
1da177e4 LT |
2160 | extern __u32 sysctl_wmem_max; |
2161 | extern __u32 sysctl_rmem_max; | |
2162 | ||
20380731 ACM |
2163 | extern void sk_init(void); |
2164 | ||
6baf1f41 DM |
2165 | extern int sysctl_optmem_max; |
2166 | ||
20380731 ACM |
2167 | extern __u32 sysctl_wmem_default; |
2168 | extern __u32 sysctl_rmem_default; | |
20380731 | 2169 | |
1da177e4 | 2170 | #endif /* _SOCK_H */ |