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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 | ||
172589cc | 43 | #include <linux/kernel.h> |
1da177e4 | 44 | #include <linux/list.h> |
88ab1932 | 45 | #include <linux/list_nulls.h> |
1da177e4 LT |
46 | #include <linux/timer.h> |
47 | #include <linux/cache.h> | |
48 | #include <linux/module.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 LT |
53 | #include <linux/security.h> |
54 | ||
55 | #include <linux/filter.h> | |
88ab1932 | 56 | #include <linux/rculist_nulls.h> |
a57de0b4 | 57 | #include <linux/poll.h> |
1da177e4 LT |
58 | |
59 | #include <asm/atomic.h> | |
60 | #include <net/dst.h> | |
61 | #include <net/checksum.h> | |
62 | ||
63 | /* | |
64 | * This structure really needs to be cleaned up. | |
65 | * Most of it is for TCP, and not used by any of | |
66 | * the other protocols. | |
67 | */ | |
68 | ||
69 | /* Define this to get the SOCK_DBG debugging facility. */ | |
70 | #define SOCK_DEBUGGING | |
71 | #ifdef SOCK_DEBUGGING | |
72 | #define SOCK_DEBUG(sk, msg...) do { if ((sk) && sock_flag((sk), SOCK_DBG)) \ | |
73 | printk(KERN_DEBUG msg); } while (0) | |
74 | #else | |
4cd9029d SH |
75 | /* Validate arguments and do nothing */ |
76 | static void inline int __attribute__ ((format (printf, 2, 3))) | |
77 | SOCK_DEBUG(struct sock *sk, const char *msg, ...) | |
78 | { | |
79 | } | |
1da177e4 LT |
80 | #endif |
81 | ||
82 | /* This is the per-socket lock. The spinlock provides a synchronization | |
83 | * between user contexts and software interrupt processing, whereas the | |
84 | * mini-semaphore synchronizes multiple users amongst themselves. | |
85 | */ | |
1da177e4 LT |
86 | typedef struct { |
87 | spinlock_t slock; | |
d2e9117c | 88 | int owned; |
1da177e4 | 89 | wait_queue_head_t wq; |
a5b5bb9a IM |
90 | /* |
91 | * We express the mutex-alike socket_lock semantics | |
92 | * to the lock validator by explicitly managing | |
93 | * the slock as a lock variant (in addition to | |
94 | * the slock itself): | |
95 | */ | |
96 | #ifdef CONFIG_DEBUG_LOCK_ALLOC | |
97 | struct lockdep_map dep_map; | |
98 | #endif | |
1da177e4 LT |
99 | } socket_lock_t; |
100 | ||
1da177e4 | 101 | struct sock; |
8feaf0c0 | 102 | struct proto; |
0eeb8ffc | 103 | struct net; |
1da177e4 LT |
104 | |
105 | /** | |
4dc3b16b | 106 | * struct sock_common - minimal network layer representation of sockets |
4dc6dc71 | 107 | * @skc_node: main hash linkage for various protocol lookup tables |
512615b6 | 108 | * @skc_nulls_node: main hash linkage for TCP/UDP/UDP-Lite protocol |
4dc6dc71 | 109 | * @skc_refcnt: reference count |
e022f0b4 | 110 | * @skc_tx_queue_mapping: tx queue number for this connection |
4dc6dc71 | 111 | * @skc_hash: hash value used with various protocol lookup tables |
d4cada4a | 112 | * @skc_u16hashes: two u16 hash values used by UDP lookup tables |
4dc3b16b PP |
113 | * @skc_family: network address family |
114 | * @skc_state: Connection state | |
115 | * @skc_reuse: %SO_REUSEADDR setting | |
116 | * @skc_bound_dev_if: bound device index if != 0 | |
4dc3b16b | 117 | * @skc_bind_node: bind hash linkage for various protocol lookup tables |
512615b6 | 118 | * @skc_portaddr_node: second hash linkage for UDP/UDP-Lite protocol |
8feaf0c0 | 119 | * @skc_prot: protocol handlers inside a network family |
07feaebf | 120 | * @skc_net: reference to the network namespace of this socket |
4dc3b16b PP |
121 | * |
122 | * This is the minimal network layer representation of sockets, the header | |
8feaf0c0 ACM |
123 | * for struct sock and struct inet_timewait_sock. |
124 | */ | |
1da177e4 | 125 | struct sock_common { |
4dc6dc71 ED |
126 | /* |
127 | * first fields are not copied in sock_copy() | |
128 | */ | |
88ab1932 ED |
129 | union { |
130 | struct hlist_node skc_node; | |
131 | struct hlist_nulls_node skc_nulls_node; | |
132 | }; | |
1da177e4 | 133 | atomic_t skc_refcnt; |
e022f0b4 | 134 | int skc_tx_queue_mapping; |
4dc6dc71 | 135 | |
d4cada4a ED |
136 | union { |
137 | unsigned int skc_hash; | |
138 | __u16 skc_u16hashes[2]; | |
139 | }; | |
4dc6dc71 ED |
140 | unsigned short skc_family; |
141 | volatile unsigned char skc_state; | |
142 | unsigned char skc_reuse; | |
143 | int skc_bound_dev_if; | |
512615b6 ED |
144 | union { |
145 | struct hlist_node skc_bind_node; | |
146 | struct hlist_nulls_node skc_portaddr_node; | |
147 | }; | |
8feaf0c0 | 148 | struct proto *skc_prot; |
3b1e0a65 | 149 | #ifdef CONFIG_NET_NS |
07feaebf | 150 | struct net *skc_net; |
3b1e0a65 | 151 | #endif |
1da177e4 LT |
152 | }; |
153 | ||
154 | /** | |
155 | * struct sock - network layer representation of sockets | |
8feaf0c0 | 156 | * @__sk_common: shared layout with inet_timewait_sock |
4dc3b16b PP |
157 | * @sk_shutdown: mask of %SEND_SHUTDOWN and/or %RCV_SHUTDOWN |
158 | * @sk_userlocks: %SO_SNDBUF and %SO_RCVBUF settings | |
159 | * @sk_lock: synchronizer | |
160 | * @sk_rcvbuf: size of receive buffer in bytes | |
161 | * @sk_sleep: sock wait queue | |
162 | * @sk_dst_cache: destination cache | |
163 | * @sk_dst_lock: destination cache lock | |
164 | * @sk_policy: flow policy | |
165 | * @sk_rmem_alloc: receive queue bytes committed | |
166 | * @sk_receive_queue: incoming packets | |
167 | * @sk_wmem_alloc: transmit queue bytes committed | |
168 | * @sk_write_queue: Packet sending queue | |
97fc2f08 | 169 | * @sk_async_wait_queue: DMA copied packets |
4dc3b16b PP |
170 | * @sk_omem_alloc: "o" is "option" or "other" |
171 | * @sk_wmem_queued: persistent queue size | |
172 | * @sk_forward_alloc: space allocated forward | |
173 | * @sk_allocation: allocation mode | |
174 | * @sk_sndbuf: size of send buffer in bytes | |
33c732c3 | 175 | * @sk_flags: %SO_LINGER (l_onoff), %SO_BROADCAST, %SO_KEEPALIVE, |
20d49473 | 176 | * %SO_OOBINLINE settings, %SO_TIMESTAMPING settings |
4dc3b16b PP |
177 | * @sk_no_check: %SO_NO_CHECK setting, wether or not checkup packets |
178 | * @sk_route_caps: route capabilities (e.g. %NETIF_F_TSO) | |
bcd76111 | 179 | * @sk_gso_type: GSO type (e.g. %SKB_GSO_TCPV4) |
82cc1a7a | 180 | * @sk_gso_max_size: Maximum GSO segment size to build |
4dc3b16b | 181 | * @sk_lingertime: %SO_LINGER l_linger setting |
4dc3b16b PP |
182 | * @sk_backlog: always used with the per-socket spinlock held |
183 | * @sk_callback_lock: used with the callbacks in the end of this struct | |
184 | * @sk_error_queue: rarely used | |
33c732c3 WC |
185 | * @sk_prot_creator: sk_prot of original sock creator (see ipv6_setsockopt, |
186 | * IPV6_ADDRFORM for instance) | |
4dc3b16b | 187 | * @sk_err: last error |
33c732c3 WC |
188 | * @sk_err_soft: errors that don't cause failure but are the cause of a |
189 | * persistent failure not just 'timed out' | |
cb61cb9b | 190 | * @sk_drops: raw/udp drops counter |
4dc3b16b PP |
191 | * @sk_ack_backlog: current listen backlog |
192 | * @sk_max_ack_backlog: listen backlog set in listen() | |
193 | * @sk_priority: %SO_PRIORITY setting | |
194 | * @sk_type: socket type (%SOCK_STREAM, etc) | |
195 | * @sk_protocol: which protocol this socket belongs in this network family | |
196 | * @sk_peercred: %SO_PEERCRED setting | |
197 | * @sk_rcvlowat: %SO_RCVLOWAT setting | |
198 | * @sk_rcvtimeo: %SO_RCVTIMEO setting | |
199 | * @sk_sndtimeo: %SO_SNDTIMEO setting | |
200 | * @sk_filter: socket filtering instructions | |
201 | * @sk_protinfo: private area, net family specific, when not using slab | |
202 | * @sk_timer: sock cleanup timer | |
203 | * @sk_stamp: time stamp of last packet received | |
204 | * @sk_socket: Identd and reporting IO signals | |
205 | * @sk_user_data: RPC layer private data | |
206 | * @sk_sndmsg_page: cached page for sendmsg | |
207 | * @sk_sndmsg_off: cached offset for sendmsg | |
208 | * @sk_send_head: front of stuff to transmit | |
67be2dd1 | 209 | * @sk_security: used by security modules |
31729363 | 210 | * @sk_mark: generic packet mark |
4dc3b16b PP |
211 | * @sk_write_pending: a write to stream socket waits to start |
212 | * @sk_state_change: callback to indicate change in the state of the sock | |
213 | * @sk_data_ready: callback to indicate there is data to be processed | |
214 | * @sk_write_space: callback to indicate there is bf sending space available | |
215 | * @sk_error_report: callback to indicate errors (e.g. %MSG_ERRQUEUE) | |
216 | * @sk_backlog_rcv: callback to process the backlog | |
217 | * @sk_destruct: called at sock freeing time, i.e. when all refcnt == 0 | |
1da177e4 LT |
218 | */ |
219 | struct sock { | |
220 | /* | |
8feaf0c0 | 221 | * Now struct inet_timewait_sock also uses sock_common, so please just |
1da177e4 LT |
222 | * don't add nothing before this first member (__sk_common) --acme |
223 | */ | |
224 | struct sock_common __sk_common; | |
4dc6dc71 ED |
225 | #define sk_node __sk_common.skc_node |
226 | #define sk_nulls_node __sk_common.skc_nulls_node | |
227 | #define sk_refcnt __sk_common.skc_refcnt | |
e022f0b4 | 228 | #define sk_tx_queue_mapping __sk_common.skc_tx_queue_mapping |
4dc6dc71 ED |
229 | |
230 | #define sk_copy_start __sk_common.skc_hash | |
231 | #define sk_hash __sk_common.skc_hash | |
1da177e4 LT |
232 | #define sk_family __sk_common.skc_family |
233 | #define sk_state __sk_common.skc_state | |
234 | #define sk_reuse __sk_common.skc_reuse | |
235 | #define sk_bound_dev_if __sk_common.skc_bound_dev_if | |
1da177e4 | 236 | #define sk_bind_node __sk_common.skc_bind_node |
8feaf0c0 | 237 | #define sk_prot __sk_common.skc_prot |
07feaebf | 238 | #define sk_net __sk_common.skc_net |
a98b65a3 | 239 | kmemcheck_bitfield_begin(flags); |
5fdb9973 ED |
240 | unsigned int sk_shutdown : 2, |
241 | sk_no_check : 2, | |
242 | sk_userlocks : 4, | |
243 | sk_protocol : 8, | |
244 | sk_type : 16; | |
a98b65a3 | 245 | kmemcheck_bitfield_end(flags); |
1da177e4 LT |
246 | int sk_rcvbuf; |
247 | socket_lock_t sk_lock; | |
fa438ccf ED |
248 | /* |
249 | * The backlog queue is special, it is always used with | |
250 | * the per-socket spinlock held and requires low latency | |
251 | * access. Therefore we special case it's implementation. | |
252 | */ | |
253 | struct { | |
254 | struct sk_buff *head; | |
255 | struct sk_buff *tail; | |
256 | } sk_backlog; | |
1da177e4 LT |
257 | wait_queue_head_t *sk_sleep; |
258 | struct dst_entry *sk_dst_cache; | |
def8b4fa | 259 | #ifdef CONFIG_XFRM |
1da177e4 | 260 | struct xfrm_policy *sk_policy[2]; |
def8b4fa | 261 | #endif |
1da177e4 LT |
262 | rwlock_t sk_dst_lock; |
263 | atomic_t sk_rmem_alloc; | |
264 | atomic_t sk_wmem_alloc; | |
265 | atomic_t sk_omem_alloc; | |
4e07a91c | 266 | int sk_sndbuf; |
1da177e4 LT |
267 | struct sk_buff_head sk_receive_queue; |
268 | struct sk_buff_head sk_write_queue; | |
23789824 | 269 | #ifdef CONFIG_NET_DMA |
97fc2f08 | 270 | struct sk_buff_head sk_async_wait_queue; |
23789824 | 271 | #endif |
1da177e4 LT |
272 | int sk_wmem_queued; |
273 | int sk_forward_alloc; | |
7d877f3b | 274 | gfp_t sk_allocation; |
1da177e4 | 275 | int sk_route_caps; |
bcd76111 | 276 | int sk_gso_type; |
82cc1a7a | 277 | unsigned int sk_gso_max_size; |
9932cf95 | 278 | int sk_rcvlowat; |
1da177e4 LT |
279 | unsigned long sk_flags; |
280 | unsigned long sk_lingertime; | |
1da177e4 | 281 | struct sk_buff_head sk_error_queue; |
476e19cf | 282 | struct proto *sk_prot_creator; |
1da177e4 LT |
283 | rwlock_t sk_callback_lock; |
284 | int sk_err, | |
285 | sk_err_soft; | |
33c732c3 | 286 | atomic_t sk_drops; |
1da177e4 LT |
287 | unsigned short sk_ack_backlog; |
288 | unsigned short sk_max_ack_backlog; | |
289 | __u32 sk_priority; | |
290 | struct ucred sk_peercred; | |
1da177e4 LT |
291 | long sk_rcvtimeo; |
292 | long sk_sndtimeo; | |
293 | struct sk_filter *sk_filter; | |
294 | void *sk_protinfo; | |
295 | struct timer_list sk_timer; | |
b7aa0bf7 | 296 | ktime_t sk_stamp; |
1da177e4 LT |
297 | struct socket *sk_socket; |
298 | void *sk_user_data; | |
299 | struct page *sk_sndmsg_page; | |
300 | struct sk_buff *sk_send_head; | |
301 | __u32 sk_sndmsg_off; | |
302 | int sk_write_pending; | |
d5f64238 | 303 | #ifdef CONFIG_SECURITY |
1da177e4 | 304 | void *sk_security; |
d5f64238 | 305 | #endif |
4a19ec58 LAT |
306 | __u32 sk_mark; |
307 | /* XXX 4 bytes hole on 64 bit */ | |
1da177e4 LT |
308 | void (*sk_state_change)(struct sock *sk); |
309 | void (*sk_data_ready)(struct sock *sk, int bytes); | |
310 | void (*sk_write_space)(struct sock *sk); | |
311 | void (*sk_error_report)(struct sock *sk); | |
312 | int (*sk_backlog_rcv)(struct sock *sk, | |
313 | struct sk_buff *skb); | |
314 | void (*sk_destruct)(struct sock *sk); | |
315 | }; | |
316 | ||
317 | /* | |
318 | * Hashed lists helper routines | |
319 | */ | |
c4146644 LZ |
320 | static inline struct sock *sk_entry(const struct hlist_node *node) |
321 | { | |
322 | return hlist_entry(node, struct sock, sk_node); | |
323 | } | |
324 | ||
e48c414e | 325 | static inline struct sock *__sk_head(const struct hlist_head *head) |
1da177e4 LT |
326 | { |
327 | return hlist_entry(head->first, struct sock, sk_node); | |
328 | } | |
329 | ||
e48c414e | 330 | static inline struct sock *sk_head(const struct hlist_head *head) |
1da177e4 LT |
331 | { |
332 | return hlist_empty(head) ? NULL : __sk_head(head); | |
333 | } | |
334 | ||
88ab1932 ED |
335 | static inline struct sock *__sk_nulls_head(const struct hlist_nulls_head *head) |
336 | { | |
337 | return hlist_nulls_entry(head->first, struct sock, sk_nulls_node); | |
338 | } | |
339 | ||
340 | static inline struct sock *sk_nulls_head(const struct hlist_nulls_head *head) | |
341 | { | |
342 | return hlist_nulls_empty(head) ? NULL : __sk_nulls_head(head); | |
343 | } | |
344 | ||
e48c414e | 345 | static inline struct sock *sk_next(const struct sock *sk) |
1da177e4 LT |
346 | { |
347 | return sk->sk_node.next ? | |
348 | hlist_entry(sk->sk_node.next, struct sock, sk_node) : NULL; | |
349 | } | |
350 | ||
88ab1932 ED |
351 | static inline struct sock *sk_nulls_next(const struct sock *sk) |
352 | { | |
353 | return (!is_a_nulls(sk->sk_nulls_node.next)) ? | |
354 | hlist_nulls_entry(sk->sk_nulls_node.next, | |
355 | struct sock, sk_nulls_node) : | |
356 | NULL; | |
357 | } | |
358 | ||
e48c414e | 359 | static inline int sk_unhashed(const struct sock *sk) |
1da177e4 LT |
360 | { |
361 | return hlist_unhashed(&sk->sk_node); | |
362 | } | |
363 | ||
e48c414e | 364 | static inline int sk_hashed(const struct sock *sk) |
1da177e4 | 365 | { |
da753bea | 366 | return !sk_unhashed(sk); |
1da177e4 LT |
367 | } |
368 | ||
369 | static __inline__ void sk_node_init(struct hlist_node *node) | |
370 | { | |
371 | node->pprev = NULL; | |
372 | } | |
373 | ||
88ab1932 ED |
374 | static __inline__ void sk_nulls_node_init(struct hlist_nulls_node *node) |
375 | { | |
376 | node->pprev = NULL; | |
377 | } | |
378 | ||
1da177e4 LT |
379 | static __inline__ void __sk_del_node(struct sock *sk) |
380 | { | |
381 | __hlist_del(&sk->sk_node); | |
382 | } | |
383 | ||
384 | static __inline__ int __sk_del_node_init(struct sock *sk) | |
385 | { | |
386 | if (sk_hashed(sk)) { | |
387 | __sk_del_node(sk); | |
388 | sk_node_init(&sk->sk_node); | |
389 | return 1; | |
390 | } | |
391 | return 0; | |
392 | } | |
393 | ||
394 | /* Grab socket reference count. This operation is valid only | |
395 | when sk is ALREADY grabbed f.e. it is found in hash table | |
396 | or a list and the lookup is made under lock preventing hash table | |
397 | modifications. | |
398 | */ | |
399 | ||
400 | static inline void sock_hold(struct sock *sk) | |
401 | { | |
402 | atomic_inc(&sk->sk_refcnt); | |
403 | } | |
404 | ||
405 | /* Ungrab socket in the context, which assumes that socket refcnt | |
406 | cannot hit zero, f.e. it is true in context of any socketcall. | |
407 | */ | |
408 | static inline void __sock_put(struct sock *sk) | |
409 | { | |
410 | atomic_dec(&sk->sk_refcnt); | |
411 | } | |
412 | ||
413 | static __inline__ int sk_del_node_init(struct sock *sk) | |
414 | { | |
415 | int rc = __sk_del_node_init(sk); | |
416 | ||
417 | if (rc) { | |
418 | /* paranoid for a while -acme */ | |
419 | WARN_ON(atomic_read(&sk->sk_refcnt) == 1); | |
420 | __sock_put(sk); | |
421 | } | |
422 | return rc; | |
423 | } | |
424 | ||
88ab1932 | 425 | static __inline__ int __sk_nulls_del_node_init_rcu(struct sock *sk) |
271b72c7 ED |
426 | { |
427 | if (sk_hashed(sk)) { | |
88ab1932 | 428 | hlist_nulls_del_init_rcu(&sk->sk_nulls_node); |
271b72c7 ED |
429 | return 1; |
430 | } | |
431 | return 0; | |
432 | } | |
433 | ||
88ab1932 | 434 | static __inline__ int sk_nulls_del_node_init_rcu(struct sock *sk) |
271b72c7 | 435 | { |
88ab1932 | 436 | int rc = __sk_nulls_del_node_init_rcu(sk); |
271b72c7 ED |
437 | |
438 | if (rc) { | |
439 | /* paranoid for a while -acme */ | |
440 | WARN_ON(atomic_read(&sk->sk_refcnt) == 1); | |
441 | __sock_put(sk); | |
442 | } | |
443 | return rc; | |
444 | } | |
445 | ||
1da177e4 LT |
446 | static __inline__ void __sk_add_node(struct sock *sk, struct hlist_head *list) |
447 | { | |
448 | hlist_add_head(&sk->sk_node, list); | |
449 | } | |
450 | ||
451 | static __inline__ void sk_add_node(struct sock *sk, struct hlist_head *list) | |
452 | { | |
453 | sock_hold(sk); | |
454 | __sk_add_node(sk, list); | |
455 | } | |
456 | ||
88ab1932 | 457 | static __inline__ void __sk_nulls_add_node_rcu(struct sock *sk, struct hlist_nulls_head *list) |
271b72c7 | 458 | { |
88ab1932 | 459 | hlist_nulls_add_head_rcu(&sk->sk_nulls_node, list); |
271b72c7 ED |
460 | } |
461 | ||
88ab1932 | 462 | static __inline__ void sk_nulls_add_node_rcu(struct sock *sk, struct hlist_nulls_head *list) |
271b72c7 ED |
463 | { |
464 | sock_hold(sk); | |
88ab1932 | 465 | __sk_nulls_add_node_rcu(sk, list); |
271b72c7 ED |
466 | } |
467 | ||
1da177e4 LT |
468 | static __inline__ void __sk_del_bind_node(struct sock *sk) |
469 | { | |
470 | __hlist_del(&sk->sk_bind_node); | |
471 | } | |
472 | ||
473 | static __inline__ void sk_add_bind_node(struct sock *sk, | |
474 | struct hlist_head *list) | |
475 | { | |
476 | hlist_add_head(&sk->sk_bind_node, list); | |
477 | } | |
478 | ||
479 | #define sk_for_each(__sk, node, list) \ | |
480 | hlist_for_each_entry(__sk, node, list, sk_node) | |
88ab1932 ED |
481 | #define sk_nulls_for_each(__sk, node, list) \ |
482 | hlist_nulls_for_each_entry(__sk, node, list, sk_nulls_node) | |
483 | #define sk_nulls_for_each_rcu(__sk, node, list) \ | |
484 | hlist_nulls_for_each_entry_rcu(__sk, node, list, sk_nulls_node) | |
1da177e4 LT |
485 | #define sk_for_each_from(__sk, node) \ |
486 | if (__sk && ({ node = &(__sk)->sk_node; 1; })) \ | |
487 | hlist_for_each_entry_from(__sk, node, sk_node) | |
88ab1932 ED |
488 | #define sk_nulls_for_each_from(__sk, node) \ |
489 | if (__sk && ({ node = &(__sk)->sk_nulls_node; 1; })) \ | |
490 | hlist_nulls_for_each_entry_from(__sk, node, sk_nulls_node) | |
1da177e4 LT |
491 | #define sk_for_each_continue(__sk, node) \ |
492 | if (__sk && ({ node = &(__sk)->sk_node; 1; })) \ | |
493 | hlist_for_each_entry_continue(__sk, node, sk_node) | |
494 | #define sk_for_each_safe(__sk, node, tmp, list) \ | |
495 | hlist_for_each_entry_safe(__sk, node, tmp, list, sk_node) | |
496 | #define sk_for_each_bound(__sk, node, list) \ | |
497 | hlist_for_each_entry(__sk, node, list, sk_bind_node) | |
498 | ||
499 | /* Sock flags */ | |
500 | enum sock_flags { | |
501 | SOCK_DEAD, | |
502 | SOCK_DONE, | |
503 | SOCK_URGINLINE, | |
504 | SOCK_KEEPOPEN, | |
505 | SOCK_LINGER, | |
506 | SOCK_DESTROY, | |
507 | SOCK_BROADCAST, | |
508 | SOCK_TIMESTAMP, | |
509 | SOCK_ZAPPED, | |
510 | SOCK_USE_WRITE_QUEUE, /* whether to call sk->sk_write_space in sock_wfree */ | |
511 | SOCK_DBG, /* %SO_DEBUG setting */ | |
512 | SOCK_RCVTSTAMP, /* %SO_TIMESTAMP setting */ | |
92f37fd2 | 513 | SOCK_RCVTSTAMPNS, /* %SO_TIMESTAMPNS setting */ |
1da177e4 LT |
514 | SOCK_LOCALROUTE, /* route locally only, %SO_DONTROUTE setting */ |
515 | SOCK_QUEUE_SHRUNK, /* write queue has been shrunk recently */ | |
20d49473 PO |
516 | SOCK_TIMESTAMPING_TX_HARDWARE, /* %SOF_TIMESTAMPING_TX_HARDWARE */ |
517 | SOCK_TIMESTAMPING_TX_SOFTWARE, /* %SOF_TIMESTAMPING_TX_SOFTWARE */ | |
518 | SOCK_TIMESTAMPING_RX_HARDWARE, /* %SOF_TIMESTAMPING_RX_HARDWARE */ | |
519 | SOCK_TIMESTAMPING_RX_SOFTWARE, /* %SOF_TIMESTAMPING_RX_SOFTWARE */ | |
520 | SOCK_TIMESTAMPING_SOFTWARE, /* %SOF_TIMESTAMPING_SOFTWARE */ | |
521 | SOCK_TIMESTAMPING_RAW_HARDWARE, /* %SOF_TIMESTAMPING_RAW_HARDWARE */ | |
522 | SOCK_TIMESTAMPING_SYS_HARDWARE, /* %SOF_TIMESTAMPING_SYS_HARDWARE */ | |
bcdce719 | 523 | SOCK_FASYNC, /* fasync() active */ |
3b885787 | 524 | SOCK_RXQ_OVFL, |
1da177e4 LT |
525 | }; |
526 | ||
53b924b3 RB |
527 | static inline void sock_copy_flags(struct sock *nsk, struct sock *osk) |
528 | { | |
529 | nsk->sk_flags = osk->sk_flags; | |
530 | } | |
531 | ||
1da177e4 LT |
532 | static inline void sock_set_flag(struct sock *sk, enum sock_flags flag) |
533 | { | |
534 | __set_bit(flag, &sk->sk_flags); | |
535 | } | |
536 | ||
537 | static inline void sock_reset_flag(struct sock *sk, enum sock_flags flag) | |
538 | { | |
539 | __clear_bit(flag, &sk->sk_flags); | |
540 | } | |
541 | ||
542 | static inline int sock_flag(struct sock *sk, enum sock_flags flag) | |
543 | { | |
544 | return test_bit(flag, &sk->sk_flags); | |
545 | } | |
546 | ||
547 | static inline void sk_acceptq_removed(struct sock *sk) | |
548 | { | |
549 | sk->sk_ack_backlog--; | |
550 | } | |
551 | ||
552 | static inline void sk_acceptq_added(struct sock *sk) | |
553 | { | |
554 | sk->sk_ack_backlog++; | |
555 | } | |
556 | ||
557 | static inline int sk_acceptq_is_full(struct sock *sk) | |
558 | { | |
64a14651 | 559 | return sk->sk_ack_backlog > sk->sk_max_ack_backlog; |
1da177e4 LT |
560 | } |
561 | ||
562 | /* | |
563 | * Compute minimal free write space needed to queue new packets. | |
564 | */ | |
565 | static inline int sk_stream_min_wspace(struct sock *sk) | |
566 | { | |
8df09ea3 | 567 | return sk->sk_wmem_queued >> 1; |
1da177e4 LT |
568 | } |
569 | ||
570 | static inline int sk_stream_wspace(struct sock *sk) | |
571 | { | |
572 | return sk->sk_sndbuf - sk->sk_wmem_queued; | |
573 | } | |
574 | ||
575 | extern void sk_stream_write_space(struct sock *sk); | |
576 | ||
577 | static inline int sk_stream_memory_free(struct sock *sk) | |
578 | { | |
579 | return sk->sk_wmem_queued < sk->sk_sndbuf; | |
580 | } | |
581 | ||
1da177e4 | 582 | /* The per-socket spinlock must be held here. */ |
9ee6b535 SH |
583 | static inline void sk_add_backlog(struct sock *sk, struct sk_buff *skb) |
584 | { | |
585 | if (!sk->sk_backlog.tail) { | |
586 | sk->sk_backlog.head = sk->sk_backlog.tail = skb; | |
587 | } else { | |
588 | sk->sk_backlog.tail->next = skb; | |
589 | sk->sk_backlog.tail = skb; | |
590 | } | |
591 | skb->next = NULL; | |
592 | } | |
1da177e4 | 593 | |
c57943a1 PZ |
594 | static inline int sk_backlog_rcv(struct sock *sk, struct sk_buff *skb) |
595 | { | |
596 | return sk->sk_backlog_rcv(sk, skb); | |
597 | } | |
598 | ||
cfcabdcc SH |
599 | #define sk_wait_event(__sk, __timeo, __condition) \ |
600 | ({ int __rc; \ | |
601 | release_sock(__sk); \ | |
602 | __rc = __condition; \ | |
603 | if (!__rc) { \ | |
604 | *(__timeo) = schedule_timeout(*(__timeo)); \ | |
605 | } \ | |
606 | lock_sock(__sk); \ | |
607 | __rc = __condition; \ | |
608 | __rc; \ | |
609 | }) | |
1da177e4 LT |
610 | |
611 | extern int sk_stream_wait_connect(struct sock *sk, long *timeo_p); | |
612 | extern int sk_stream_wait_memory(struct sock *sk, long *timeo_p); | |
613 | extern void sk_stream_wait_close(struct sock *sk, long timeo_p); | |
614 | extern int sk_stream_error(struct sock *sk, int flags, int err); | |
615 | extern void sk_stream_kill_queues(struct sock *sk); | |
616 | ||
617 | extern int sk_wait_data(struct sock *sk, long *timeo); | |
618 | ||
60236fdd | 619 | struct request_sock_ops; |
6d6ee43e | 620 | struct timewait_sock_ops; |
ab1e0a13 | 621 | struct inet_hashinfo; |
fc8717ba | 622 | struct raw_hashinfo; |
2e6599cb | 623 | |
1da177e4 LT |
624 | /* Networking protocol blocks we attach to sockets. |
625 | * socket layer -> transport layer interface | |
626 | * transport -> network interface is defined by struct inet_proto | |
627 | */ | |
628 | struct proto { | |
629 | void (*close)(struct sock *sk, | |
630 | long timeout); | |
631 | int (*connect)(struct sock *sk, | |
632 | struct sockaddr *uaddr, | |
633 | int addr_len); | |
634 | int (*disconnect)(struct sock *sk, int flags); | |
635 | ||
636 | struct sock * (*accept) (struct sock *sk, int flags, int *err); | |
637 | ||
638 | int (*ioctl)(struct sock *sk, int cmd, | |
639 | unsigned long arg); | |
640 | int (*init)(struct sock *sk); | |
7d06b2e0 | 641 | void (*destroy)(struct sock *sk); |
1da177e4 LT |
642 | void (*shutdown)(struct sock *sk, int how); |
643 | int (*setsockopt)(struct sock *sk, int level, | |
644 | int optname, char __user *optval, | |
b7058842 | 645 | unsigned int optlen); |
1da177e4 LT |
646 | int (*getsockopt)(struct sock *sk, int level, |
647 | int optname, char __user *optval, | |
648 | int __user *option); | |
af01d537 | 649 | #ifdef CONFIG_COMPAT |
3fdadf7d DM |
650 | int (*compat_setsockopt)(struct sock *sk, |
651 | int level, | |
652 | int optname, char __user *optval, | |
b7058842 | 653 | unsigned int optlen); |
3fdadf7d DM |
654 | int (*compat_getsockopt)(struct sock *sk, |
655 | int level, | |
656 | int optname, char __user *optval, | |
657 | int __user *option); | |
af01d537 | 658 | #endif |
1da177e4 LT |
659 | int (*sendmsg)(struct kiocb *iocb, struct sock *sk, |
660 | struct msghdr *msg, size_t len); | |
661 | int (*recvmsg)(struct kiocb *iocb, struct sock *sk, | |
662 | struct msghdr *msg, | |
663 | size_t len, int noblock, int flags, | |
664 | int *addr_len); | |
665 | int (*sendpage)(struct sock *sk, struct page *page, | |
666 | int offset, size_t size, int flags); | |
667 | int (*bind)(struct sock *sk, | |
668 | struct sockaddr *uaddr, int addr_len); | |
669 | ||
670 | int (*backlog_rcv) (struct sock *sk, | |
671 | struct sk_buff *skb); | |
672 | ||
673 | /* Keeping track of sk's, looking them up, and port selection methods. */ | |
674 | void (*hash)(struct sock *sk); | |
675 | void (*unhash)(struct sock *sk); | |
676 | int (*get_port)(struct sock *sk, unsigned short snum); | |
677 | ||
286ab3d4 | 678 | /* Keeping track of sockets in use */ |
65f76517 | 679 | #ifdef CONFIG_PROC_FS |
13ff3d6f | 680 | unsigned int inuse_idx; |
65f76517 | 681 | #endif |
ebb53d75 | 682 | |
1da177e4 | 683 | /* Memory pressure */ |
5c52ba17 | 684 | void (*enter_memory_pressure)(struct sock *sk); |
1da177e4 | 685 | atomic_t *memory_allocated; /* Current allocated memory. */ |
1748376b | 686 | struct percpu_counter *sockets_allocated; /* Current number of sockets. */ |
1da177e4 LT |
687 | /* |
688 | * Pressure flag: try to collapse. | |
689 | * Technical note: it is used by multiple contexts non atomically. | |
3ab224be | 690 | * All the __sk_mem_schedule() is of this nature: accounting |
1da177e4 LT |
691 | * is strict, actions are advisory and have some latency. |
692 | */ | |
693 | int *memory_pressure; | |
694 | int *sysctl_mem; | |
695 | int *sysctl_wmem; | |
696 | int *sysctl_rmem; | |
697 | int max_header; | |
698 | ||
271b72c7 | 699 | struct kmem_cache *slab; |
1da177e4 | 700 | unsigned int obj_size; |
271b72c7 | 701 | int slab_flags; |
1da177e4 | 702 | |
dd24c001 | 703 | struct percpu_counter *orphan_count; |
8feaf0c0 | 704 | |
60236fdd | 705 | struct request_sock_ops *rsk_prot; |
6d6ee43e | 706 | struct timewait_sock_ops *twsk_prot; |
2e6599cb | 707 | |
39d8cda7 PE |
708 | union { |
709 | struct inet_hashinfo *hashinfo; | |
645ca708 | 710 | struct udp_table *udp_table; |
fc8717ba | 711 | struct raw_hashinfo *raw_hash; |
39d8cda7 | 712 | } h; |
ab1e0a13 | 713 | |
1da177e4 LT |
714 | struct module *owner; |
715 | ||
716 | char name[32]; | |
717 | ||
718 | struct list_head node; | |
e6848976 ACM |
719 | #ifdef SOCK_REFCNT_DEBUG |
720 | atomic_t socks; | |
721 | #endif | |
1da177e4 LT |
722 | }; |
723 | ||
724 | extern int proto_register(struct proto *prot, int alloc_slab); | |
725 | extern void proto_unregister(struct proto *prot); | |
726 | ||
e6848976 ACM |
727 | #ifdef SOCK_REFCNT_DEBUG |
728 | static inline void sk_refcnt_debug_inc(struct sock *sk) | |
729 | { | |
730 | atomic_inc(&sk->sk_prot->socks); | |
731 | } | |
732 | ||
733 | static inline void sk_refcnt_debug_dec(struct sock *sk) | |
734 | { | |
735 | atomic_dec(&sk->sk_prot->socks); | |
736 | printk(KERN_DEBUG "%s socket %p released, %d are still alive\n", | |
737 | sk->sk_prot->name, sk, atomic_read(&sk->sk_prot->socks)); | |
738 | } | |
739 | ||
740 | static inline void sk_refcnt_debug_release(const struct sock *sk) | |
741 | { | |
742 | if (atomic_read(&sk->sk_refcnt) != 1) | |
743 | printk(KERN_DEBUG "Destruction of the %s socket %p delayed, refcnt=%d\n", | |
744 | sk->sk_prot->name, sk, atomic_read(&sk->sk_refcnt)); | |
745 | } | |
746 | #else /* SOCK_REFCNT_DEBUG */ | |
747 | #define sk_refcnt_debug_inc(sk) do { } while (0) | |
748 | #define sk_refcnt_debug_dec(sk) do { } while (0) | |
749 | #define sk_refcnt_debug_release(sk) do { } while (0) | |
750 | #endif /* SOCK_REFCNT_DEBUG */ | |
751 | ||
65f76517 ED |
752 | |
753 | #ifdef CONFIG_PROC_FS | |
1da177e4 | 754 | /* Called with local bh disabled */ |
c29a0bc4 PE |
755 | extern void sock_prot_inuse_add(struct net *net, struct proto *prot, int inc); |
756 | extern int sock_prot_inuse_get(struct net *net, struct proto *proto); | |
65f76517 | 757 | #else |
c29a0bc4 PE |
758 | static void inline sock_prot_inuse_add(struct net *net, struct proto *prot, |
759 | int inc) | |
65f76517 ED |
760 | { |
761 | } | |
65f76517 ED |
762 | #endif |
763 | ||
1da177e4 | 764 | |
614c6cb4 ACM |
765 | /* With per-bucket locks this operation is not-atomic, so that |
766 | * this version is not worse. | |
767 | */ | |
768 | static inline void __sk_prot_rehash(struct sock *sk) | |
769 | { | |
770 | sk->sk_prot->unhash(sk); | |
771 | sk->sk_prot->hash(sk); | |
772 | } | |
773 | ||
1da177e4 LT |
774 | /* About 10 seconds */ |
775 | #define SOCK_DESTROY_TIME (10*HZ) | |
776 | ||
777 | /* Sockets 0-1023 can't be bound to unless you are superuser */ | |
778 | #define PROT_SOCK 1024 | |
779 | ||
780 | #define SHUTDOWN_MASK 3 | |
781 | #define RCV_SHUTDOWN 1 | |
782 | #define SEND_SHUTDOWN 2 | |
783 | ||
784 | #define SOCK_SNDBUF_LOCK 1 | |
785 | #define SOCK_RCVBUF_LOCK 2 | |
786 | #define SOCK_BINDADDR_LOCK 4 | |
787 | #define SOCK_BINDPORT_LOCK 8 | |
788 | ||
789 | /* sock_iocb: used to kick off async processing of socket ios */ | |
790 | struct sock_iocb { | |
791 | struct list_head list; | |
792 | ||
793 | int flags; | |
794 | int size; | |
795 | struct socket *sock; | |
796 | struct sock *sk; | |
797 | struct scm_cookie *scm; | |
798 | struct msghdr *msg, async_msg; | |
1da177e4 LT |
799 | struct kiocb *kiocb; |
800 | }; | |
801 | ||
802 | static inline struct sock_iocb *kiocb_to_siocb(struct kiocb *iocb) | |
803 | { | |
804 | return (struct sock_iocb *)iocb->private; | |
805 | } | |
806 | ||
807 | static inline struct kiocb *siocb_to_kiocb(struct sock_iocb *si) | |
808 | { | |
809 | return si->kiocb; | |
810 | } | |
811 | ||
812 | struct socket_alloc { | |
813 | struct socket socket; | |
814 | struct inode vfs_inode; | |
815 | }; | |
816 | ||
817 | static inline struct socket *SOCKET_I(struct inode *inode) | |
818 | { | |
819 | return &container_of(inode, struct socket_alloc, vfs_inode)->socket; | |
820 | } | |
821 | ||
822 | static inline struct inode *SOCK_INODE(struct socket *socket) | |
823 | { | |
824 | return &container_of(socket, struct socket_alloc, socket)->vfs_inode; | |
825 | } | |
826 | ||
3ab224be HA |
827 | /* |
828 | * Functions for memory accounting | |
829 | */ | |
830 | extern int __sk_mem_schedule(struct sock *sk, int size, int kind); | |
831 | extern void __sk_mem_reclaim(struct sock *sk); | |
1da177e4 | 832 | |
3ab224be HA |
833 | #define SK_MEM_QUANTUM ((int)PAGE_SIZE) |
834 | #define SK_MEM_QUANTUM_SHIFT ilog2(SK_MEM_QUANTUM) | |
835 | #define SK_MEM_SEND 0 | |
836 | #define SK_MEM_RECV 1 | |
1da177e4 | 837 | |
3ab224be | 838 | static inline int sk_mem_pages(int amt) |
1da177e4 | 839 | { |
3ab224be | 840 | return (amt + SK_MEM_QUANTUM - 1) >> SK_MEM_QUANTUM_SHIFT; |
1da177e4 LT |
841 | } |
842 | ||
3ab224be | 843 | static inline int sk_has_account(struct sock *sk) |
1da177e4 | 844 | { |
3ab224be HA |
845 | /* return true if protocol supports memory accounting */ |
846 | return !!sk->sk_prot->memory_allocated; | |
1da177e4 LT |
847 | } |
848 | ||
3ab224be | 849 | static inline int sk_wmem_schedule(struct sock *sk, int size) |
1da177e4 | 850 | { |
3ab224be HA |
851 | if (!sk_has_account(sk)) |
852 | return 1; | |
853 | return size <= sk->sk_forward_alloc || | |
854 | __sk_mem_schedule(sk, size, SK_MEM_SEND); | |
1da177e4 LT |
855 | } |
856 | ||
3ab224be | 857 | static inline int sk_rmem_schedule(struct sock *sk, int size) |
d80d99d6 | 858 | { |
3ab224be HA |
859 | if (!sk_has_account(sk)) |
860 | return 1; | |
d80d99d6 | 861 | return size <= sk->sk_forward_alloc || |
3ab224be HA |
862 | __sk_mem_schedule(sk, size, SK_MEM_RECV); |
863 | } | |
864 | ||
865 | static inline void sk_mem_reclaim(struct sock *sk) | |
866 | { | |
867 | if (!sk_has_account(sk)) | |
868 | return; | |
869 | if (sk->sk_forward_alloc >= SK_MEM_QUANTUM) | |
870 | __sk_mem_reclaim(sk); | |
871 | } | |
872 | ||
9993e7d3 DM |
873 | static inline void sk_mem_reclaim_partial(struct sock *sk) |
874 | { | |
875 | if (!sk_has_account(sk)) | |
876 | return; | |
877 | if (sk->sk_forward_alloc > SK_MEM_QUANTUM) | |
878 | __sk_mem_reclaim(sk); | |
879 | } | |
880 | ||
3ab224be HA |
881 | static inline void sk_mem_charge(struct sock *sk, int size) |
882 | { | |
883 | if (!sk_has_account(sk)) | |
884 | return; | |
885 | sk->sk_forward_alloc -= size; | |
886 | } | |
887 | ||
888 | static inline void sk_mem_uncharge(struct sock *sk, int size) | |
889 | { | |
890 | if (!sk_has_account(sk)) | |
891 | return; | |
892 | sk->sk_forward_alloc += size; | |
893 | } | |
894 | ||
895 | static inline void sk_wmem_free_skb(struct sock *sk, struct sk_buff *skb) | |
896 | { | |
3ab224be HA |
897 | sock_set_flag(sk, SOCK_QUEUE_SHRUNK); |
898 | sk->sk_wmem_queued -= skb->truesize; | |
899 | sk_mem_uncharge(sk, skb->truesize); | |
900 | __kfree_skb(skb); | |
d80d99d6 HX |
901 | } |
902 | ||
1da177e4 LT |
903 | /* Used by processes to "lock" a socket state, so that |
904 | * interrupts and bottom half handlers won't change it | |
905 | * from under us. It essentially blocks any incoming | |
906 | * packets, so that we won't get any new data or any | |
907 | * packets that change the state of the socket. | |
908 | * | |
909 | * While locked, BH processing will add new packets to | |
910 | * the backlog queue. This queue is processed by the | |
911 | * owner of the socket lock right before it is released. | |
912 | * | |
913 | * Since ~2.3.5 it is also exclusive sleep lock serializing | |
914 | * accesses from user process context. | |
915 | */ | |
d2e9117c | 916 | #define sock_owned_by_user(sk) ((sk)->sk_lock.owned) |
1da177e4 | 917 | |
ed07536e PZ |
918 | /* |
919 | * Macro so as to not evaluate some arguments when | |
920 | * lockdep is not enabled. | |
921 | * | |
922 | * Mark both the sk_lock and the sk_lock.slock as a | |
923 | * per-address-family lock class. | |
924 | */ | |
925 | #define sock_lock_init_class_and_name(sk, sname, skey, name, key) \ | |
926 | do { \ | |
e8f6fbf6 | 927 | sk->sk_lock.owned = 0; \ |
ed07536e PZ |
928 | init_waitqueue_head(&sk->sk_lock.wq); \ |
929 | spin_lock_init(&(sk)->sk_lock.slock); \ | |
930 | debug_check_no_locks_freed((void *)&(sk)->sk_lock, \ | |
931 | sizeof((sk)->sk_lock)); \ | |
932 | lockdep_set_class_and_name(&(sk)->sk_lock.slock, \ | |
933 | (skey), (sname)); \ | |
934 | lockdep_init_map(&(sk)->sk_lock.dep_map, (name), (key), 0); \ | |
935 | } while (0) | |
936 | ||
41380930 | 937 | extern void lock_sock_nested(struct sock *sk, int subclass); |
fcc70d5f PZ |
938 | |
939 | static inline void lock_sock(struct sock *sk) | |
940 | { | |
941 | lock_sock_nested(sk, 0); | |
942 | } | |
943 | ||
41380930 | 944 | extern void release_sock(struct sock *sk); |
1da177e4 LT |
945 | |
946 | /* BH context may only use the following locking interface. */ | |
947 | #define bh_lock_sock(__sk) spin_lock(&((__sk)->sk_lock.slock)) | |
c6366184 IM |
948 | #define bh_lock_sock_nested(__sk) \ |
949 | spin_lock_nested(&((__sk)->sk_lock.slock), \ | |
950 | SINGLE_DEPTH_NESTING) | |
1da177e4 LT |
951 | #define bh_unlock_sock(__sk) spin_unlock(&((__sk)->sk_lock.slock)) |
952 | ||
1b8d7ae4 | 953 | extern struct sock *sk_alloc(struct net *net, int family, |
dd0fc66f | 954 | gfp_t priority, |
6257ff21 | 955 | struct proto *prot); |
1da177e4 | 956 | extern void sk_free(struct sock *sk); |
edf02087 | 957 | extern void sk_release_kernel(struct sock *sk); |
87d11ceb | 958 | extern struct sock *sk_clone(const struct sock *sk, |
dd0fc66f | 959 | const gfp_t priority); |
1da177e4 LT |
960 | |
961 | extern struct sk_buff *sock_wmalloc(struct sock *sk, | |
962 | unsigned long size, int force, | |
dd0fc66f | 963 | gfp_t priority); |
1da177e4 LT |
964 | extern struct sk_buff *sock_rmalloc(struct sock *sk, |
965 | unsigned long size, int force, | |
dd0fc66f | 966 | gfp_t priority); |
1da177e4 LT |
967 | extern void sock_wfree(struct sk_buff *skb); |
968 | extern void sock_rfree(struct sk_buff *skb); | |
969 | ||
970 | extern int sock_setsockopt(struct socket *sock, int level, | |
971 | int op, char __user *optval, | |
b7058842 | 972 | unsigned int optlen); |
1da177e4 LT |
973 | |
974 | extern int sock_getsockopt(struct socket *sock, int level, | |
975 | int op, char __user *optval, | |
976 | int __user *optlen); | |
977 | extern struct sk_buff *sock_alloc_send_skb(struct sock *sk, | |
978 | unsigned long size, | |
979 | int noblock, | |
980 | int *errcode); | |
4cc7f68d HX |
981 | extern struct sk_buff *sock_alloc_send_pskb(struct sock *sk, |
982 | unsigned long header_len, | |
983 | unsigned long data_len, | |
984 | int noblock, | |
985 | int *errcode); | |
86a76caf | 986 | extern void *sock_kmalloc(struct sock *sk, int size, |
dd0fc66f | 987 | gfp_t priority); |
1da177e4 LT |
988 | extern void sock_kfree_s(struct sock *sk, void *mem, int size); |
989 | extern void sk_send_sigurg(struct sock *sk); | |
990 | ||
991 | /* | |
992 | * Functions to fill in entries in struct proto_ops when a protocol | |
993 | * does not implement a particular function. | |
994 | */ | |
995 | extern int sock_no_bind(struct socket *, | |
996 | struct sockaddr *, int); | |
997 | extern int sock_no_connect(struct socket *, | |
998 | struct sockaddr *, int, int); | |
999 | extern int sock_no_socketpair(struct socket *, | |
1000 | struct socket *); | |
1001 | extern int sock_no_accept(struct socket *, | |
1002 | struct socket *, int); | |
1003 | extern int sock_no_getname(struct socket *, | |
1004 | struct sockaddr *, int *, int); | |
1005 | extern unsigned int sock_no_poll(struct file *, struct socket *, | |
1006 | struct poll_table_struct *); | |
1007 | extern int sock_no_ioctl(struct socket *, unsigned int, | |
1008 | unsigned long); | |
1009 | extern int sock_no_listen(struct socket *, int); | |
1010 | extern int sock_no_shutdown(struct socket *, int); | |
1011 | extern int sock_no_getsockopt(struct socket *, int , int, | |
1012 | char __user *, int __user *); | |
1013 | extern int sock_no_setsockopt(struct socket *, int, int, | |
b7058842 | 1014 | char __user *, unsigned int); |
1da177e4 LT |
1015 | extern int sock_no_sendmsg(struct kiocb *, struct socket *, |
1016 | struct msghdr *, size_t); | |
1017 | extern int sock_no_recvmsg(struct kiocb *, struct socket *, | |
1018 | struct msghdr *, size_t, int); | |
1019 | extern int sock_no_mmap(struct file *file, | |
1020 | struct socket *sock, | |
1021 | struct vm_area_struct *vma); | |
1022 | extern ssize_t sock_no_sendpage(struct socket *sock, | |
1023 | struct page *page, | |
1024 | int offset, size_t size, | |
1025 | int flags); | |
1026 | ||
1027 | /* | |
1028 | * Functions to fill in entries in struct proto_ops when a protocol | |
1029 | * uses the inet style. | |
1030 | */ | |
1031 | extern int sock_common_getsockopt(struct socket *sock, int level, int optname, | |
1032 | char __user *optval, int __user *optlen); | |
1033 | extern int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock, | |
1034 | struct msghdr *msg, size_t size, int flags); | |
1035 | extern int sock_common_setsockopt(struct socket *sock, int level, int optname, | |
b7058842 | 1036 | char __user *optval, unsigned int optlen); |
3fdadf7d DM |
1037 | extern int compat_sock_common_getsockopt(struct socket *sock, int level, |
1038 | int optname, char __user *optval, int __user *optlen); | |
1039 | extern int compat_sock_common_setsockopt(struct socket *sock, int level, | |
b7058842 | 1040 | int optname, char __user *optval, unsigned int optlen); |
1da177e4 LT |
1041 | |
1042 | extern void sk_common_release(struct sock *sk); | |
1043 | ||
1044 | /* | |
1045 | * Default socket callbacks and setup code | |
1046 | */ | |
1047 | ||
1048 | /* Initialise core socket variables */ | |
1049 | extern void sock_init_data(struct socket *sock, struct sock *sk); | |
1050 | ||
dc9b3346 PB |
1051 | /** |
1052 | * sk_filter_release: Release a socket filter | |
dc9b3346 PB |
1053 | * @fp: filter to remove |
1054 | * | |
1055 | * Remove a filter from a socket and release its resources. | |
1056 | */ | |
1057 | ||
309dd5fc PE |
1058 | static inline void sk_filter_release(struct sk_filter *fp) |
1059 | { | |
1060 | if (atomic_dec_and_test(&fp->refcnt)) | |
47e958ea | 1061 | kfree(fp); |
309dd5fc PE |
1062 | } |
1063 | ||
1064 | static inline void sk_filter_uncharge(struct sock *sk, struct sk_filter *fp) | |
1da177e4 LT |
1065 | { |
1066 | unsigned int size = sk_filter_len(fp); | |
1067 | ||
1068 | atomic_sub(size, &sk->sk_omem_alloc); | |
309dd5fc | 1069 | sk_filter_release(fp); |
1da177e4 LT |
1070 | } |
1071 | ||
1072 | static inline void sk_filter_charge(struct sock *sk, struct sk_filter *fp) | |
1073 | { | |
1074 | atomic_inc(&fp->refcnt); | |
1075 | atomic_add(sk_filter_len(fp), &sk->sk_omem_alloc); | |
1076 | } | |
1077 | ||
1078 | /* | |
1079 | * Socket reference counting postulates. | |
1080 | * | |
1081 | * * Each user of socket SHOULD hold a reference count. | |
1082 | * * Each access point to socket (an hash table bucket, reference from a list, | |
1083 | * running timer, skb in flight MUST hold a reference count. | |
1084 | * * When reference count hits 0, it means it will never increase back. | |
1085 | * * When reference count hits 0, it means that no references from | |
1086 | * outside exist to this socket and current process on current CPU | |
1087 | * is last user and may/should destroy this socket. | |
1088 | * * sk_free is called from any context: process, BH, IRQ. When | |
1089 | * it is called, socket has no references from outside -> sk_free | |
1090 | * may release descendant resources allocated by the socket, but | |
1091 | * to the time when it is called, socket is NOT referenced by any | |
1092 | * hash tables, lists etc. | |
1093 | * * Packets, delivered from outside (from network or from another process) | |
1094 | * and enqueued on receive/error queues SHOULD NOT grab reference count, | |
1095 | * when they sit in queue. Otherwise, packets will leak to hole, when | |
1096 | * socket is looked up by one cpu and unhasing is made by another CPU. | |
1097 | * It is true for udp/raw, netlink (leak to receive and error queues), tcp | |
1098 | * (leak to backlog). Packet socket does all the processing inside | |
1099 | * BR_NETPROTO_LOCK, so that it has not this race condition. UNIX sockets | |
1100 | * use separate SMP lock, so that they are prone too. | |
1101 | */ | |
1102 | ||
1103 | /* Ungrab socket and destroy it, if it was the last reference. */ | |
1104 | static inline void sock_put(struct sock *sk) | |
1105 | { | |
1106 | if (atomic_dec_and_test(&sk->sk_refcnt)) | |
1107 | sk_free(sk); | |
1108 | } | |
1109 | ||
58a5a7b9 ACM |
1110 | extern int sk_receive_skb(struct sock *sk, struct sk_buff *skb, |
1111 | const int nested); | |
25995ff5 | 1112 | |
e022f0b4 KK |
1113 | static inline void sk_tx_queue_set(struct sock *sk, int tx_queue) |
1114 | { | |
1115 | sk->sk_tx_queue_mapping = tx_queue; | |
1116 | } | |
1117 | ||
1118 | static inline void sk_tx_queue_clear(struct sock *sk) | |
1119 | { | |
1120 | sk->sk_tx_queue_mapping = -1; | |
1121 | } | |
1122 | ||
1123 | static inline int sk_tx_queue_get(const struct sock *sk) | |
1124 | { | |
1125 | return sk->sk_tx_queue_mapping; | |
1126 | } | |
1127 | ||
1128 | static inline bool sk_tx_queue_recorded(const struct sock *sk) | |
1129 | { | |
1130 | return (sk && sk->sk_tx_queue_mapping >= 0); | |
1131 | } | |
1132 | ||
972692e0 DM |
1133 | static inline void sk_set_socket(struct sock *sk, struct socket *sock) |
1134 | { | |
e022f0b4 | 1135 | sk_tx_queue_clear(sk); |
972692e0 DM |
1136 | sk->sk_socket = sock; |
1137 | } | |
1138 | ||
1da177e4 LT |
1139 | /* Detach socket from process context. |
1140 | * Announce socket dead, detach it from wait queue and inode. | |
1141 | * Note that parent inode held reference count on this struct sock, | |
1142 | * we do not release it in this function, because protocol | |
1143 | * probably wants some additional cleanups or even continuing | |
1144 | * to work with this socket (TCP). | |
1145 | */ | |
1146 | static inline void sock_orphan(struct sock *sk) | |
1147 | { | |
1148 | write_lock_bh(&sk->sk_callback_lock); | |
1149 | sock_set_flag(sk, SOCK_DEAD); | |
972692e0 | 1150 | sk_set_socket(sk, NULL); |
1da177e4 LT |
1151 | sk->sk_sleep = NULL; |
1152 | write_unlock_bh(&sk->sk_callback_lock); | |
1153 | } | |
1154 | ||
1155 | static inline void sock_graft(struct sock *sk, struct socket *parent) | |
1156 | { | |
1157 | write_lock_bh(&sk->sk_callback_lock); | |
1158 | sk->sk_sleep = &parent->wait; | |
1159 | parent->sk = sk; | |
972692e0 | 1160 | sk_set_socket(sk, parent); |
4237c75c | 1161 | security_sock_graft(sk, parent); |
1da177e4 LT |
1162 | write_unlock_bh(&sk->sk_callback_lock); |
1163 | } | |
1164 | ||
1165 | extern int sock_i_uid(struct sock *sk); | |
1166 | extern unsigned long sock_i_ino(struct sock *sk); | |
1167 | ||
1168 | static inline struct dst_entry * | |
1169 | __sk_dst_get(struct sock *sk) | |
1170 | { | |
1171 | return sk->sk_dst_cache; | |
1172 | } | |
1173 | ||
1174 | static inline struct dst_entry * | |
1175 | sk_dst_get(struct sock *sk) | |
1176 | { | |
1177 | struct dst_entry *dst; | |
1178 | ||
1179 | read_lock(&sk->sk_dst_lock); | |
1180 | dst = sk->sk_dst_cache; | |
1181 | if (dst) | |
1182 | dst_hold(dst); | |
1183 | read_unlock(&sk->sk_dst_lock); | |
1184 | return dst; | |
1185 | } | |
1186 | ||
1187 | static inline void | |
1188 | __sk_dst_set(struct sock *sk, struct dst_entry *dst) | |
1189 | { | |
1190 | struct dst_entry *old_dst; | |
1191 | ||
e022f0b4 | 1192 | sk_tx_queue_clear(sk); |
1da177e4 LT |
1193 | old_dst = sk->sk_dst_cache; |
1194 | sk->sk_dst_cache = dst; | |
1195 | dst_release(old_dst); | |
1196 | } | |
1197 | ||
1198 | static inline void | |
1199 | sk_dst_set(struct sock *sk, struct dst_entry *dst) | |
1200 | { | |
1201 | write_lock(&sk->sk_dst_lock); | |
1202 | __sk_dst_set(sk, dst); | |
1203 | write_unlock(&sk->sk_dst_lock); | |
1204 | } | |
1205 | ||
1206 | static inline void | |
1207 | __sk_dst_reset(struct sock *sk) | |
1208 | { | |
1209 | struct dst_entry *old_dst; | |
1210 | ||
e022f0b4 | 1211 | sk_tx_queue_clear(sk); |
1da177e4 LT |
1212 | old_dst = sk->sk_dst_cache; |
1213 | sk->sk_dst_cache = NULL; | |
1214 | dst_release(old_dst); | |
1215 | } | |
1216 | ||
1217 | static inline void | |
1218 | sk_dst_reset(struct sock *sk) | |
1219 | { | |
1220 | write_lock(&sk->sk_dst_lock); | |
1221 | __sk_dst_reset(sk); | |
1222 | write_unlock(&sk->sk_dst_lock); | |
1223 | } | |
1224 | ||
f0088a50 | 1225 | extern struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie); |
1da177e4 | 1226 | |
f0088a50 | 1227 | extern struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie); |
1da177e4 | 1228 | |
bcd76111 HX |
1229 | static inline int sk_can_gso(const struct sock *sk) |
1230 | { | |
1231 | return net_gso_ok(sk->sk_route_caps, sk->sk_gso_type); | |
1232 | } | |
1233 | ||
9958089a | 1234 | extern void sk_setup_caps(struct sock *sk, struct dst_entry *dst); |
6cbb0df7 | 1235 | |
1da177e4 LT |
1236 | static inline int skb_copy_to_page(struct sock *sk, char __user *from, |
1237 | struct sk_buff *skb, struct page *page, | |
1238 | int off, int copy) | |
1239 | { | |
1240 | if (skb->ip_summed == CHECKSUM_NONE) { | |
1241 | int err = 0; | |
5084205f | 1242 | __wsum csum = csum_and_copy_from_user(from, |
1da177e4 LT |
1243 | page_address(page) + off, |
1244 | copy, 0, &err); | |
1245 | if (err) | |
1246 | return err; | |
1247 | skb->csum = csum_block_add(skb->csum, csum, skb->len); | |
1248 | } else if (copy_from_user(page_address(page) + off, from, copy)) | |
1249 | return -EFAULT; | |
1250 | ||
1251 | skb->len += copy; | |
1252 | skb->data_len += copy; | |
1253 | skb->truesize += copy; | |
1254 | sk->sk_wmem_queued += copy; | |
3ab224be | 1255 | sk_mem_charge(sk, copy); |
1da177e4 LT |
1256 | return 0; |
1257 | } | |
1258 | ||
c564039f ED |
1259 | /** |
1260 | * sk_wmem_alloc_get - returns write allocations | |
1261 | * @sk: socket | |
1262 | * | |
1263 | * Returns sk_wmem_alloc minus initial offset of one | |
1264 | */ | |
1265 | static inline int sk_wmem_alloc_get(const struct sock *sk) | |
1266 | { | |
1267 | return atomic_read(&sk->sk_wmem_alloc) - 1; | |
1268 | } | |
1269 | ||
1270 | /** | |
1271 | * sk_rmem_alloc_get - returns read allocations | |
1272 | * @sk: socket | |
1273 | * | |
1274 | * Returns sk_rmem_alloc | |
1275 | */ | |
1276 | static inline int sk_rmem_alloc_get(const struct sock *sk) | |
1277 | { | |
1278 | return atomic_read(&sk->sk_rmem_alloc); | |
1279 | } | |
1280 | ||
1281 | /** | |
1282 | * sk_has_allocations - check if allocations are outstanding | |
1283 | * @sk: socket | |
1284 | * | |
1285 | * Returns true if socket has write or read allocations | |
1286 | */ | |
1287 | static inline int sk_has_allocations(const struct sock *sk) | |
1288 | { | |
1289 | return sk_wmem_alloc_get(sk) || sk_rmem_alloc_get(sk); | |
1290 | } | |
1291 | ||
a57de0b4 JO |
1292 | /** |
1293 | * sk_has_sleeper - check if there are any waiting processes | |
1294 | * @sk: socket | |
1295 | * | |
1296 | * Returns true if socket has waiting processes | |
1297 | * | |
1298 | * The purpose of the sk_has_sleeper and sock_poll_wait is to wrap the memory | |
1299 | * barrier call. They were added due to the race found within the tcp code. | |
1300 | * | |
1301 | * Consider following tcp code paths: | |
1302 | * | |
1303 | * CPU1 CPU2 | |
1304 | * | |
1305 | * sys_select receive packet | |
1306 | * ... ... | |
1307 | * __add_wait_queue update tp->rcv_nxt | |
1308 | * ... ... | |
1309 | * tp->rcv_nxt check sock_def_readable | |
1310 | * ... { | |
1311 | * schedule ... | |
1312 | * if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) | |
1313 | * wake_up_interruptible(sk->sk_sleep) | |
1314 | * ... | |
1315 | * } | |
1316 | * | |
1317 | * The race for tcp fires when the __add_wait_queue changes done by CPU1 stay | |
1318 | * in its cache, and so does the tp->rcv_nxt update on CPU2 side. The CPU1 | |
1319 | * could then endup calling schedule and sleep forever if there are no more | |
1320 | * data on the socket. | |
ad462769 JO |
1321 | * |
1322 | * The sk_has_sleeper is always called right after a call to read_lock, so we | |
1323 | * can use smp_mb__after_lock barrier. | |
a57de0b4 JO |
1324 | */ |
1325 | static inline int sk_has_sleeper(struct sock *sk) | |
1326 | { | |
1327 | /* | |
1328 | * We need to be sure we are in sync with the | |
1329 | * add_wait_queue modifications to the wait queue. | |
1330 | * | |
1331 | * This memory barrier is paired in the sock_poll_wait. | |
1332 | */ | |
ad462769 | 1333 | smp_mb__after_lock(); |
a57de0b4 JO |
1334 | return sk->sk_sleep && waitqueue_active(sk->sk_sleep); |
1335 | } | |
1336 | ||
1337 | /** | |
1338 | * sock_poll_wait - place memory barrier behind the poll_wait call. | |
1339 | * @filp: file | |
1340 | * @wait_address: socket wait queue | |
1341 | * @p: poll_table | |
1342 | * | |
1343 | * See the comments in the sk_has_sleeper function. | |
1344 | */ | |
1345 | static inline void sock_poll_wait(struct file *filp, | |
1346 | wait_queue_head_t *wait_address, poll_table *p) | |
1347 | { | |
1348 | if (p && wait_address) { | |
1349 | poll_wait(filp, wait_address, p); | |
1350 | /* | |
1351 | * We need to be sure we are in sync with the | |
1352 | * socket flags modification. | |
1353 | * | |
1354 | * This memory barrier is paired in the sk_has_sleeper. | |
1355 | */ | |
1356 | smp_mb(); | |
1357 | } | |
1358 | } | |
1359 | ||
1da177e4 LT |
1360 | /* |
1361 | * Queue a received datagram if it will fit. Stream and sequenced | |
1362 | * protocols can't normally use this as they need to fit buffers in | |
1363 | * and play with them. | |
1364 | * | |
1365 | * Inlined as it's very short and called for pretty much every | |
1366 | * packet ever received. | |
1367 | */ | |
1368 | ||
1369 | static inline void skb_set_owner_w(struct sk_buff *skb, struct sock *sk) | |
1370 | { | |
d55d87fd | 1371 | skb_orphan(skb); |
1da177e4 LT |
1372 | skb->sk = sk; |
1373 | skb->destructor = sock_wfree; | |
2b85a34e ED |
1374 | /* |
1375 | * We used to take a refcount on sk, but following operation | |
1376 | * is enough to guarantee sk_free() wont free this sock until | |
1377 | * all in-flight packets are completed | |
1378 | */ | |
1da177e4 LT |
1379 | atomic_add(skb->truesize, &sk->sk_wmem_alloc); |
1380 | } | |
1381 | ||
1382 | static inline void skb_set_owner_r(struct sk_buff *skb, struct sock *sk) | |
1383 | { | |
d55d87fd | 1384 | skb_orphan(skb); |
1da177e4 LT |
1385 | skb->sk = sk; |
1386 | skb->destructor = sock_rfree; | |
1387 | atomic_add(skb->truesize, &sk->sk_rmem_alloc); | |
3ab224be | 1388 | sk_mem_charge(sk, skb->truesize); |
1da177e4 LT |
1389 | } |
1390 | ||
1391 | extern void sk_reset_timer(struct sock *sk, struct timer_list* timer, | |
1392 | unsigned long expires); | |
1393 | ||
1394 | extern void sk_stop_timer(struct sock *sk, struct timer_list* timer); | |
1395 | ||
f0088a50 | 1396 | extern int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb); |
1da177e4 LT |
1397 | |
1398 | static inline int sock_queue_err_skb(struct sock *sk, struct sk_buff *skb) | |
1399 | { | |
1400 | /* Cast skb->rcvbuf to unsigned... It's pointless, but reduces | |
1401 | number of warnings when compiling with -W --ANK | |
1402 | */ | |
1403 | if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >= | |
1404 | (unsigned)sk->sk_rcvbuf) | |
1405 | return -ENOMEM; | |
1406 | skb_set_owner_r(skb, sk); | |
1407 | skb_queue_tail(&sk->sk_error_queue, skb); | |
1408 | if (!sock_flag(sk, SOCK_DEAD)) | |
1409 | sk->sk_data_ready(sk, skb->len); | |
1410 | return 0; | |
1411 | } | |
1412 | ||
1413 | /* | |
1414 | * Recover an error report and clear atomically | |
1415 | */ | |
1416 | ||
1417 | static inline int sock_error(struct sock *sk) | |
1418 | { | |
c1cbe4b7 BL |
1419 | int err; |
1420 | if (likely(!sk->sk_err)) | |
1421 | return 0; | |
1422 | err = xchg(&sk->sk_err, 0); | |
1da177e4 LT |
1423 | return -err; |
1424 | } | |
1425 | ||
1426 | static inline unsigned long sock_wspace(struct sock *sk) | |
1427 | { | |
1428 | int amt = 0; | |
1429 | ||
1430 | if (!(sk->sk_shutdown & SEND_SHUTDOWN)) { | |
1431 | amt = sk->sk_sndbuf - atomic_read(&sk->sk_wmem_alloc); | |
1432 | if (amt < 0) | |
1433 | amt = 0; | |
1434 | } | |
1435 | return amt; | |
1436 | } | |
1437 | ||
1438 | static inline void sk_wake_async(struct sock *sk, int how, int band) | |
1439 | { | |
bcdce719 | 1440 | if (sock_flag(sk, SOCK_FASYNC)) |
1da177e4 LT |
1441 | sock_wake_async(sk->sk_socket, how, band); |
1442 | } | |
1443 | ||
1444 | #define SOCK_MIN_SNDBUF 2048 | |
1445 | #define SOCK_MIN_RCVBUF 256 | |
1446 | ||
1447 | static inline void sk_stream_moderate_sndbuf(struct sock *sk) | |
1448 | { | |
1449 | if (!(sk->sk_userlocks & SOCK_SNDBUF_LOCK)) { | |
8df09ea3 | 1450 | sk->sk_sndbuf = min(sk->sk_sndbuf, sk->sk_wmem_queued >> 1); |
1da177e4 LT |
1451 | sk->sk_sndbuf = max(sk->sk_sndbuf, SOCK_MIN_SNDBUF); |
1452 | } | |
1453 | } | |
1454 | ||
df97c708 | 1455 | struct sk_buff *sk_stream_alloc_skb(struct sock *sk, int size, gfp_t gfp); |
1da177e4 LT |
1456 | |
1457 | static inline struct page *sk_stream_alloc_page(struct sock *sk) | |
1458 | { | |
1459 | struct page *page = NULL; | |
1460 | ||
ef015786 HX |
1461 | page = alloc_pages(sk->sk_allocation, 0); |
1462 | if (!page) { | |
5c52ba17 | 1463 | sk->sk_prot->enter_memory_pressure(sk); |
1da177e4 LT |
1464 | sk_stream_moderate_sndbuf(sk); |
1465 | } | |
1466 | return page; | |
1467 | } | |
1468 | ||
1da177e4 LT |
1469 | /* |
1470 | * Default write policy as shown to user space via poll/select/SIGIO | |
1471 | */ | |
1472 | static inline int sock_writeable(const struct sock *sk) | |
1473 | { | |
8df09ea3 | 1474 | return atomic_read(&sk->sk_wmem_alloc) < (sk->sk_sndbuf >> 1); |
1da177e4 LT |
1475 | } |
1476 | ||
dd0fc66f | 1477 | static inline gfp_t gfp_any(void) |
1da177e4 | 1478 | { |
99709372 | 1479 | return in_softirq() ? GFP_ATOMIC : GFP_KERNEL; |
1da177e4 LT |
1480 | } |
1481 | ||
1482 | static inline long sock_rcvtimeo(const struct sock *sk, int noblock) | |
1483 | { | |
1484 | return noblock ? 0 : sk->sk_rcvtimeo; | |
1485 | } | |
1486 | ||
1487 | static inline long sock_sndtimeo(const struct sock *sk, int noblock) | |
1488 | { | |
1489 | return noblock ? 0 : sk->sk_sndtimeo; | |
1490 | } | |
1491 | ||
1492 | static inline int sock_rcvlowat(const struct sock *sk, int waitall, int len) | |
1493 | { | |
1494 | return (waitall ? len : min_t(int, sk->sk_rcvlowat, len)) ? : 1; | |
1495 | } | |
1496 | ||
1497 | /* Alas, with timeout socket operations are not restartable. | |
1498 | * Compare this to poll(). | |
1499 | */ | |
1500 | static inline int sock_intr_errno(long timeo) | |
1501 | { | |
1502 | return timeo == MAX_SCHEDULE_TIMEOUT ? -ERESTARTSYS : -EINTR; | |
1503 | } | |
1504 | ||
92f37fd2 ED |
1505 | extern void __sock_recv_timestamp(struct msghdr *msg, struct sock *sk, |
1506 | struct sk_buff *skb); | |
1507 | ||
1da177e4 LT |
1508 | static __inline__ void |
1509 | sock_recv_timestamp(struct msghdr *msg, struct sock *sk, struct sk_buff *skb) | |
1510 | { | |
b7aa0bf7 | 1511 | ktime_t kt = skb->tstamp; |
20d49473 | 1512 | struct skb_shared_hwtstamps *hwtstamps = skb_hwtstamps(skb); |
a61bbcf2 | 1513 | |
20d49473 PO |
1514 | /* |
1515 | * generate control messages if | |
1516 | * - receive time stamping in software requested (SOCK_RCVTSTAMP | |
1517 | * or SOCK_TIMESTAMPING_RX_SOFTWARE) | |
1518 | * - software time stamp available and wanted | |
1519 | * (SOCK_TIMESTAMPING_SOFTWARE) | |
1520 | * - hardware time stamps available and wanted | |
1521 | * (SOCK_TIMESTAMPING_SYS_HARDWARE or | |
1522 | * SOCK_TIMESTAMPING_RAW_HARDWARE) | |
1523 | */ | |
1524 | if (sock_flag(sk, SOCK_RCVTSTAMP) || | |
1525 | sock_flag(sk, SOCK_TIMESTAMPING_RX_SOFTWARE) || | |
1526 | (kt.tv64 && sock_flag(sk, SOCK_TIMESTAMPING_SOFTWARE)) || | |
1527 | (hwtstamps->hwtstamp.tv64 && | |
1528 | sock_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE)) || | |
1529 | (hwtstamps->syststamp.tv64 && | |
1530 | sock_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE))) | |
92f37fd2 ED |
1531 | __sock_recv_timestamp(msg, sk, skb); |
1532 | else | |
b7aa0bf7 | 1533 | sk->sk_stamp = kt; |
1da177e4 LT |
1534 | } |
1535 | ||
3b885787 NH |
1536 | extern void sock_recv_ts_and_drops(struct msghdr *msg, struct sock *sk, struct sk_buff *skb); |
1537 | ||
20d49473 PO |
1538 | /** |
1539 | * sock_tx_timestamp - checks whether the outgoing packet is to be time stamped | |
1540 | * @msg: outgoing packet | |
1541 | * @sk: socket sending this packet | |
1542 | * @shtx: filled with instructions for time stamping | |
1543 | * | |
1544 | * Currently only depends on SOCK_TIMESTAMPING* flags. Returns error code if | |
1545 | * parameters are invalid. | |
1546 | */ | |
1547 | extern int sock_tx_timestamp(struct msghdr *msg, | |
1548 | struct sock *sk, | |
1549 | union skb_shared_tx *shtx); | |
1550 | ||
1551 | ||
1da177e4 LT |
1552 | /** |
1553 | * sk_eat_skb - Release a skb if it is no longer needed | |
4dc3b16b PP |
1554 | * @sk: socket to eat this skb from |
1555 | * @skb: socket buffer to eat | |
f4b8ea78 | 1556 | * @copied_early: flag indicating whether DMA operations copied this data early |
1da177e4 LT |
1557 | * |
1558 | * This routine must be called with interrupts disabled or with the socket | |
1559 | * locked so that the sk_buff queue operation is ok. | |
1560 | */ | |
624d1164 CL |
1561 | #ifdef CONFIG_NET_DMA |
1562 | static inline void sk_eat_skb(struct sock *sk, struct sk_buff *skb, int copied_early) | |
1563 | { | |
1564 | __skb_unlink(skb, &sk->sk_receive_queue); | |
1565 | if (!copied_early) | |
1566 | __kfree_skb(skb); | |
1567 | else | |
1568 | __skb_queue_tail(&sk->sk_async_wait_queue, skb); | |
1569 | } | |
1570 | #else | |
1571 | static inline void sk_eat_skb(struct sock *sk, struct sk_buff *skb, int copied_early) | |
1da177e4 LT |
1572 | { |
1573 | __skb_unlink(skb, &sk->sk_receive_queue); | |
1574 | __kfree_skb(skb); | |
1575 | } | |
624d1164 | 1576 | #endif |
1da177e4 | 1577 | |
3b1e0a65 YH |
1578 | static inline |
1579 | struct net *sock_net(const struct sock *sk) | |
1580 | { | |
1581 | #ifdef CONFIG_NET_NS | |
1582 | return sk->sk_net; | |
1583 | #else | |
1584 | return &init_net; | |
1585 | #endif | |
1586 | } | |
1587 | ||
1588 | static inline | |
f5aa23fd | 1589 | void sock_net_set(struct sock *sk, struct net *net) |
3b1e0a65 YH |
1590 | { |
1591 | #ifdef CONFIG_NET_NS | |
1592 | sk->sk_net = net; | |
1593 | #endif | |
1594 | } | |
1595 | ||
edf02087 DL |
1596 | /* |
1597 | * Kernel sockets, f.e. rtnl or icmp_socket, are a part of a namespace. | |
1598 | * They should not hold a referrence to a namespace in order to allow | |
1599 | * to stop it. | |
1600 | * Sockets after sk_change_net should be released using sk_release_kernel | |
1601 | */ | |
1602 | static inline void sk_change_net(struct sock *sk, struct net *net) | |
1603 | { | |
3b1e0a65 | 1604 | put_net(sock_net(sk)); |
65a18ec5 | 1605 | sock_net_set(sk, hold_net(net)); |
edf02087 DL |
1606 | } |
1607 | ||
23542618 KK |
1608 | static inline struct sock *skb_steal_sock(struct sk_buff *skb) |
1609 | { | |
1610 | if (unlikely(skb->sk)) { | |
1611 | struct sock *sk = skb->sk; | |
1612 | ||
1613 | skb->destructor = NULL; | |
1614 | skb->sk = NULL; | |
1615 | return sk; | |
1616 | } | |
1617 | return NULL; | |
1618 | } | |
1619 | ||
20d49473 | 1620 | extern void sock_enable_timestamp(struct sock *sk, int flag); |
1da177e4 | 1621 | extern int sock_get_timestamp(struct sock *, struct timeval __user *); |
ae40eb1e | 1622 | extern int sock_get_timestampns(struct sock *, struct timespec __user *); |
1da177e4 LT |
1623 | |
1624 | /* | |
1625 | * Enable debug/info messages | |
1626 | */ | |
a2a316fd SH |
1627 | extern int net_msg_warn; |
1628 | #define NETDEBUG(fmt, args...) \ | |
1629 | do { if (net_msg_warn) printk(fmt,##args); } while (0) | |
1da177e4 | 1630 | |
a2a316fd SH |
1631 | #define LIMIT_NETDEBUG(fmt, args...) \ |
1632 | do { if (net_msg_warn && net_ratelimit()) printk(fmt,##args); } while(0) | |
1da177e4 | 1633 | |
1da177e4 LT |
1634 | extern __u32 sysctl_wmem_max; |
1635 | extern __u32 sysctl_rmem_max; | |
1636 | ||
20380731 ACM |
1637 | extern void sk_init(void); |
1638 | ||
6baf1f41 DM |
1639 | extern int sysctl_optmem_max; |
1640 | ||
20380731 ACM |
1641 | extern __u32 sysctl_wmem_default; |
1642 | extern __u32 sysctl_rmem_default; | |
20380731 | 1643 | |
1da177e4 | 1644 | #endif /* _SOCK_H */ |