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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 LT |
44 | #include <linux/list.h> |
45 | #include <linux/timer.h> | |
46 | #include <linux/cache.h> | |
47 | #include <linux/module.h> | |
a5b5bb9a | 48 | #include <linux/lockdep.h> |
1da177e4 LT |
49 | #include <linux/netdevice.h> |
50 | #include <linux/skbuff.h> /* struct sk_buff */ | |
d7fe0f24 | 51 | #include <linux/mm.h> |
1da177e4 LT |
52 | #include <linux/security.h> |
53 | ||
54 | #include <linux/filter.h> | |
55 | ||
56 | #include <asm/atomic.h> | |
57 | #include <net/dst.h> | |
58 | #include <net/checksum.h> | |
1b8d7ae4 | 59 | #include <net/net_namespace.h> |
1da177e4 LT |
60 | |
61 | /* | |
62 | * This structure really needs to be cleaned up. | |
63 | * Most of it is for TCP, and not used by any of | |
64 | * the other protocols. | |
65 | */ | |
66 | ||
67 | /* Define this to get the SOCK_DBG debugging facility. */ | |
68 | #define SOCK_DEBUGGING | |
69 | #ifdef SOCK_DEBUGGING | |
70 | #define SOCK_DEBUG(sk, msg...) do { if ((sk) && sock_flag((sk), SOCK_DBG)) \ | |
71 | printk(KERN_DEBUG msg); } while (0) | |
72 | #else | |
73 | #define SOCK_DEBUG(sk, msg...) do { } while (0) | |
74 | #endif | |
75 | ||
76 | /* This is the per-socket lock. The spinlock provides a synchronization | |
77 | * between user contexts and software interrupt processing, whereas the | |
78 | * mini-semaphore synchronizes multiple users amongst themselves. | |
79 | */ | |
1da177e4 LT |
80 | typedef struct { |
81 | spinlock_t slock; | |
d2e9117c | 82 | int owned; |
1da177e4 | 83 | wait_queue_head_t wq; |
a5b5bb9a IM |
84 | /* |
85 | * We express the mutex-alike socket_lock semantics | |
86 | * to the lock validator by explicitly managing | |
87 | * the slock as a lock variant (in addition to | |
88 | * the slock itself): | |
89 | */ | |
90 | #ifdef CONFIG_DEBUG_LOCK_ALLOC | |
91 | struct lockdep_map dep_map; | |
92 | #endif | |
1da177e4 LT |
93 | } socket_lock_t; |
94 | ||
1da177e4 | 95 | struct sock; |
8feaf0c0 | 96 | struct proto; |
1da177e4 LT |
97 | |
98 | /** | |
4dc3b16b PP |
99 | * struct sock_common - minimal network layer representation of sockets |
100 | * @skc_family: network address family | |
101 | * @skc_state: Connection state | |
102 | * @skc_reuse: %SO_REUSEADDR setting | |
103 | * @skc_bound_dev_if: bound device index if != 0 | |
104 | * @skc_node: main hash linkage for various protocol lookup tables | |
105 | * @skc_bind_node: bind hash linkage for various protocol lookup tables | |
106 | * @skc_refcnt: reference count | |
81c3d547 | 107 | * @skc_hash: hash value used with various protocol lookup tables |
8feaf0c0 | 108 | * @skc_prot: protocol handlers inside a network family |
07feaebf | 109 | * @skc_net: reference to the network namespace of this socket |
4dc3b16b PP |
110 | * |
111 | * This is the minimal network layer representation of sockets, the header | |
8feaf0c0 ACM |
112 | * for struct sock and struct inet_timewait_sock. |
113 | */ | |
1da177e4 LT |
114 | struct sock_common { |
115 | unsigned short skc_family; | |
116 | volatile unsigned char skc_state; | |
117 | unsigned char skc_reuse; | |
118 | int skc_bound_dev_if; | |
119 | struct hlist_node skc_node; | |
120 | struct hlist_node skc_bind_node; | |
121 | atomic_t skc_refcnt; | |
81c3d547 | 122 | unsigned int skc_hash; |
8feaf0c0 | 123 | struct proto *skc_prot; |
07feaebf | 124 | struct net *skc_net; |
1da177e4 LT |
125 | }; |
126 | ||
127 | /** | |
128 | * struct sock - network layer representation of sockets | |
8feaf0c0 | 129 | * @__sk_common: shared layout with inet_timewait_sock |
4dc3b16b PP |
130 | * @sk_shutdown: mask of %SEND_SHUTDOWN and/or %RCV_SHUTDOWN |
131 | * @sk_userlocks: %SO_SNDBUF and %SO_RCVBUF settings | |
132 | * @sk_lock: synchronizer | |
133 | * @sk_rcvbuf: size of receive buffer in bytes | |
134 | * @sk_sleep: sock wait queue | |
135 | * @sk_dst_cache: destination cache | |
136 | * @sk_dst_lock: destination cache lock | |
137 | * @sk_policy: flow policy | |
138 | * @sk_rmem_alloc: receive queue bytes committed | |
139 | * @sk_receive_queue: incoming packets | |
140 | * @sk_wmem_alloc: transmit queue bytes committed | |
141 | * @sk_write_queue: Packet sending queue | |
97fc2f08 | 142 | * @sk_async_wait_queue: DMA copied packets |
4dc3b16b PP |
143 | * @sk_omem_alloc: "o" is "option" or "other" |
144 | * @sk_wmem_queued: persistent queue size | |
145 | * @sk_forward_alloc: space allocated forward | |
146 | * @sk_allocation: allocation mode | |
147 | * @sk_sndbuf: size of send buffer in bytes | |
148 | * @sk_flags: %SO_LINGER (l_onoff), %SO_BROADCAST, %SO_KEEPALIVE, %SO_OOBINLINE settings | |
149 | * @sk_no_check: %SO_NO_CHECK setting, wether or not checkup packets | |
150 | * @sk_route_caps: route capabilities (e.g. %NETIF_F_TSO) | |
bcd76111 | 151 | * @sk_gso_type: GSO type (e.g. %SKB_GSO_TCPV4) |
4dc3b16b | 152 | * @sk_lingertime: %SO_LINGER l_linger setting |
4dc3b16b PP |
153 | * @sk_backlog: always used with the per-socket spinlock held |
154 | * @sk_callback_lock: used with the callbacks in the end of this struct | |
155 | * @sk_error_queue: rarely used | |
476e19cf | 156 | * @sk_prot_creator: sk_prot of original sock creator (see ipv6_setsockopt, IPV6_ADDRFORM for instance) |
4dc3b16b PP |
157 | * @sk_err: last error |
158 | * @sk_err_soft: errors that don't cause failure but are the cause of a persistent failure not just 'timed out' | |
159 | * @sk_ack_backlog: current listen backlog | |
160 | * @sk_max_ack_backlog: listen backlog set in listen() | |
161 | * @sk_priority: %SO_PRIORITY setting | |
162 | * @sk_type: socket type (%SOCK_STREAM, etc) | |
163 | * @sk_protocol: which protocol this socket belongs in this network family | |
164 | * @sk_peercred: %SO_PEERCRED setting | |
165 | * @sk_rcvlowat: %SO_RCVLOWAT setting | |
166 | * @sk_rcvtimeo: %SO_RCVTIMEO setting | |
167 | * @sk_sndtimeo: %SO_SNDTIMEO setting | |
168 | * @sk_filter: socket filtering instructions | |
169 | * @sk_protinfo: private area, net family specific, when not using slab | |
170 | * @sk_timer: sock cleanup timer | |
171 | * @sk_stamp: time stamp of last packet received | |
172 | * @sk_socket: Identd and reporting IO signals | |
173 | * @sk_user_data: RPC layer private data | |
174 | * @sk_sndmsg_page: cached page for sendmsg | |
175 | * @sk_sndmsg_off: cached offset for sendmsg | |
176 | * @sk_send_head: front of stuff to transmit | |
67be2dd1 | 177 | * @sk_security: used by security modules |
4dc3b16b PP |
178 | * @sk_write_pending: a write to stream socket waits to start |
179 | * @sk_state_change: callback to indicate change in the state of the sock | |
180 | * @sk_data_ready: callback to indicate there is data to be processed | |
181 | * @sk_write_space: callback to indicate there is bf sending space available | |
182 | * @sk_error_report: callback to indicate errors (e.g. %MSG_ERRQUEUE) | |
183 | * @sk_backlog_rcv: callback to process the backlog | |
184 | * @sk_destruct: called at sock freeing time, i.e. when all refcnt == 0 | |
1da177e4 LT |
185 | */ |
186 | struct sock { | |
187 | /* | |
8feaf0c0 | 188 | * Now struct inet_timewait_sock also uses sock_common, so please just |
1da177e4 LT |
189 | * don't add nothing before this first member (__sk_common) --acme |
190 | */ | |
191 | struct sock_common __sk_common; | |
192 | #define sk_family __sk_common.skc_family | |
193 | #define sk_state __sk_common.skc_state | |
194 | #define sk_reuse __sk_common.skc_reuse | |
195 | #define sk_bound_dev_if __sk_common.skc_bound_dev_if | |
196 | #define sk_node __sk_common.skc_node | |
197 | #define sk_bind_node __sk_common.skc_bind_node | |
198 | #define sk_refcnt __sk_common.skc_refcnt | |
81c3d547 | 199 | #define sk_hash __sk_common.skc_hash |
8feaf0c0 | 200 | #define sk_prot __sk_common.skc_prot |
07feaebf | 201 | #define sk_net __sk_common.skc_net |
1da177e4 LT |
202 | unsigned char sk_shutdown : 2, |
203 | sk_no_check : 2, | |
204 | sk_userlocks : 4; | |
205 | unsigned char sk_protocol; | |
206 | unsigned short sk_type; | |
207 | int sk_rcvbuf; | |
208 | socket_lock_t sk_lock; | |
fa438ccf ED |
209 | /* |
210 | * The backlog queue is special, it is always used with | |
211 | * the per-socket spinlock held and requires low latency | |
212 | * access. Therefore we special case it's implementation. | |
213 | */ | |
214 | struct { | |
215 | struct sk_buff *head; | |
216 | struct sk_buff *tail; | |
217 | } sk_backlog; | |
1da177e4 LT |
218 | wait_queue_head_t *sk_sleep; |
219 | struct dst_entry *sk_dst_cache; | |
220 | struct xfrm_policy *sk_policy[2]; | |
221 | rwlock_t sk_dst_lock; | |
222 | atomic_t sk_rmem_alloc; | |
223 | atomic_t sk_wmem_alloc; | |
224 | atomic_t sk_omem_alloc; | |
4e07a91c | 225 | int sk_sndbuf; |
1da177e4 LT |
226 | struct sk_buff_head sk_receive_queue; |
227 | struct sk_buff_head sk_write_queue; | |
97fc2f08 | 228 | struct sk_buff_head sk_async_wait_queue; |
1da177e4 LT |
229 | int sk_wmem_queued; |
230 | int sk_forward_alloc; | |
7d877f3b | 231 | gfp_t sk_allocation; |
1da177e4 | 232 | int sk_route_caps; |
bcd76111 | 233 | int sk_gso_type; |
9932cf95 | 234 | int sk_rcvlowat; |
1da177e4 LT |
235 | unsigned long sk_flags; |
236 | unsigned long sk_lingertime; | |
1da177e4 | 237 | struct sk_buff_head sk_error_queue; |
476e19cf | 238 | struct proto *sk_prot_creator; |
1da177e4 LT |
239 | rwlock_t sk_callback_lock; |
240 | int sk_err, | |
241 | sk_err_soft; | |
242 | unsigned short sk_ack_backlog; | |
243 | unsigned short sk_max_ack_backlog; | |
244 | __u32 sk_priority; | |
245 | struct ucred sk_peercred; | |
1da177e4 LT |
246 | long sk_rcvtimeo; |
247 | long sk_sndtimeo; | |
248 | struct sk_filter *sk_filter; | |
249 | void *sk_protinfo; | |
250 | struct timer_list sk_timer; | |
b7aa0bf7 | 251 | ktime_t sk_stamp; |
1da177e4 LT |
252 | struct socket *sk_socket; |
253 | void *sk_user_data; | |
254 | struct page *sk_sndmsg_page; | |
255 | struct sk_buff *sk_send_head; | |
256 | __u32 sk_sndmsg_off; | |
257 | int sk_write_pending; | |
258 | void *sk_security; | |
259 | void (*sk_state_change)(struct sock *sk); | |
260 | void (*sk_data_ready)(struct sock *sk, int bytes); | |
261 | void (*sk_write_space)(struct sock *sk); | |
262 | void (*sk_error_report)(struct sock *sk); | |
263 | int (*sk_backlog_rcv)(struct sock *sk, | |
264 | struct sk_buff *skb); | |
265 | void (*sk_destruct)(struct sock *sk); | |
266 | }; | |
267 | ||
268 | /* | |
269 | * Hashed lists helper routines | |
270 | */ | |
e48c414e | 271 | static inline struct sock *__sk_head(const struct hlist_head *head) |
1da177e4 LT |
272 | { |
273 | return hlist_entry(head->first, struct sock, sk_node); | |
274 | } | |
275 | ||
e48c414e | 276 | static inline struct sock *sk_head(const struct hlist_head *head) |
1da177e4 LT |
277 | { |
278 | return hlist_empty(head) ? NULL : __sk_head(head); | |
279 | } | |
280 | ||
e48c414e | 281 | static inline struct sock *sk_next(const struct sock *sk) |
1da177e4 LT |
282 | { |
283 | return sk->sk_node.next ? | |
284 | hlist_entry(sk->sk_node.next, struct sock, sk_node) : NULL; | |
285 | } | |
286 | ||
e48c414e | 287 | static inline int sk_unhashed(const struct sock *sk) |
1da177e4 LT |
288 | { |
289 | return hlist_unhashed(&sk->sk_node); | |
290 | } | |
291 | ||
e48c414e | 292 | static inline int sk_hashed(const struct sock *sk) |
1da177e4 | 293 | { |
da753bea | 294 | return !sk_unhashed(sk); |
1da177e4 LT |
295 | } |
296 | ||
297 | static __inline__ void sk_node_init(struct hlist_node *node) | |
298 | { | |
299 | node->pprev = NULL; | |
300 | } | |
301 | ||
302 | static __inline__ void __sk_del_node(struct sock *sk) | |
303 | { | |
304 | __hlist_del(&sk->sk_node); | |
305 | } | |
306 | ||
307 | static __inline__ int __sk_del_node_init(struct sock *sk) | |
308 | { | |
309 | if (sk_hashed(sk)) { | |
310 | __sk_del_node(sk); | |
311 | sk_node_init(&sk->sk_node); | |
312 | return 1; | |
313 | } | |
314 | return 0; | |
315 | } | |
316 | ||
317 | /* Grab socket reference count. This operation is valid only | |
318 | when sk is ALREADY grabbed f.e. it is found in hash table | |
319 | or a list and the lookup is made under lock preventing hash table | |
320 | modifications. | |
321 | */ | |
322 | ||
323 | static inline void sock_hold(struct sock *sk) | |
324 | { | |
325 | atomic_inc(&sk->sk_refcnt); | |
326 | } | |
327 | ||
328 | /* Ungrab socket in the context, which assumes that socket refcnt | |
329 | cannot hit zero, f.e. it is true in context of any socketcall. | |
330 | */ | |
331 | static inline void __sock_put(struct sock *sk) | |
332 | { | |
333 | atomic_dec(&sk->sk_refcnt); | |
334 | } | |
335 | ||
336 | static __inline__ int sk_del_node_init(struct sock *sk) | |
337 | { | |
338 | int rc = __sk_del_node_init(sk); | |
339 | ||
340 | if (rc) { | |
341 | /* paranoid for a while -acme */ | |
342 | WARN_ON(atomic_read(&sk->sk_refcnt) == 1); | |
343 | __sock_put(sk); | |
344 | } | |
345 | return rc; | |
346 | } | |
347 | ||
348 | static __inline__ void __sk_add_node(struct sock *sk, struct hlist_head *list) | |
349 | { | |
350 | hlist_add_head(&sk->sk_node, list); | |
351 | } | |
352 | ||
353 | static __inline__ void sk_add_node(struct sock *sk, struct hlist_head *list) | |
354 | { | |
355 | sock_hold(sk); | |
356 | __sk_add_node(sk, list); | |
357 | } | |
358 | ||
359 | static __inline__ void __sk_del_bind_node(struct sock *sk) | |
360 | { | |
361 | __hlist_del(&sk->sk_bind_node); | |
362 | } | |
363 | ||
364 | static __inline__ void sk_add_bind_node(struct sock *sk, | |
365 | struct hlist_head *list) | |
366 | { | |
367 | hlist_add_head(&sk->sk_bind_node, list); | |
368 | } | |
369 | ||
370 | #define sk_for_each(__sk, node, list) \ | |
371 | hlist_for_each_entry(__sk, node, list, sk_node) | |
372 | #define sk_for_each_from(__sk, node) \ | |
373 | if (__sk && ({ node = &(__sk)->sk_node; 1; })) \ | |
374 | hlist_for_each_entry_from(__sk, node, sk_node) | |
375 | #define sk_for_each_continue(__sk, node) \ | |
376 | if (__sk && ({ node = &(__sk)->sk_node; 1; })) \ | |
377 | hlist_for_each_entry_continue(__sk, node, sk_node) | |
378 | #define sk_for_each_safe(__sk, node, tmp, list) \ | |
379 | hlist_for_each_entry_safe(__sk, node, tmp, list, sk_node) | |
380 | #define sk_for_each_bound(__sk, node, list) \ | |
381 | hlist_for_each_entry(__sk, node, list, sk_bind_node) | |
382 | ||
383 | /* Sock flags */ | |
384 | enum sock_flags { | |
385 | SOCK_DEAD, | |
386 | SOCK_DONE, | |
387 | SOCK_URGINLINE, | |
388 | SOCK_KEEPOPEN, | |
389 | SOCK_LINGER, | |
390 | SOCK_DESTROY, | |
391 | SOCK_BROADCAST, | |
392 | SOCK_TIMESTAMP, | |
393 | SOCK_ZAPPED, | |
394 | SOCK_USE_WRITE_QUEUE, /* whether to call sk->sk_write_space in sock_wfree */ | |
395 | SOCK_DBG, /* %SO_DEBUG setting */ | |
396 | SOCK_RCVTSTAMP, /* %SO_TIMESTAMP setting */ | |
92f37fd2 | 397 | SOCK_RCVTSTAMPNS, /* %SO_TIMESTAMPNS setting */ |
1da177e4 LT |
398 | SOCK_LOCALROUTE, /* route locally only, %SO_DONTROUTE setting */ |
399 | SOCK_QUEUE_SHRUNK, /* write queue has been shrunk recently */ | |
400 | }; | |
401 | ||
53b924b3 RB |
402 | static inline void sock_copy_flags(struct sock *nsk, struct sock *osk) |
403 | { | |
404 | nsk->sk_flags = osk->sk_flags; | |
405 | } | |
406 | ||
1da177e4 LT |
407 | static inline void sock_set_flag(struct sock *sk, enum sock_flags flag) |
408 | { | |
409 | __set_bit(flag, &sk->sk_flags); | |
410 | } | |
411 | ||
412 | static inline void sock_reset_flag(struct sock *sk, enum sock_flags flag) | |
413 | { | |
414 | __clear_bit(flag, &sk->sk_flags); | |
415 | } | |
416 | ||
417 | static inline int sock_flag(struct sock *sk, enum sock_flags flag) | |
418 | { | |
419 | return test_bit(flag, &sk->sk_flags); | |
420 | } | |
421 | ||
422 | static inline void sk_acceptq_removed(struct sock *sk) | |
423 | { | |
424 | sk->sk_ack_backlog--; | |
425 | } | |
426 | ||
427 | static inline void sk_acceptq_added(struct sock *sk) | |
428 | { | |
429 | sk->sk_ack_backlog++; | |
430 | } | |
431 | ||
432 | static inline int sk_acceptq_is_full(struct sock *sk) | |
433 | { | |
64a14651 | 434 | return sk->sk_ack_backlog > sk->sk_max_ack_backlog; |
1da177e4 LT |
435 | } |
436 | ||
437 | /* | |
438 | * Compute minimal free write space needed to queue new packets. | |
439 | */ | |
440 | static inline int sk_stream_min_wspace(struct sock *sk) | |
441 | { | |
442 | return sk->sk_wmem_queued / 2; | |
443 | } | |
444 | ||
445 | static inline int sk_stream_wspace(struct sock *sk) | |
446 | { | |
447 | return sk->sk_sndbuf - sk->sk_wmem_queued; | |
448 | } | |
449 | ||
450 | extern void sk_stream_write_space(struct sock *sk); | |
451 | ||
452 | static inline int sk_stream_memory_free(struct sock *sk) | |
453 | { | |
454 | return sk->sk_wmem_queued < sk->sk_sndbuf; | |
455 | } | |
456 | ||
457 | extern void sk_stream_rfree(struct sk_buff *skb); | |
458 | ||
459 | static inline void sk_stream_set_owner_r(struct sk_buff *skb, struct sock *sk) | |
460 | { | |
461 | skb->sk = sk; | |
462 | skb->destructor = sk_stream_rfree; | |
463 | atomic_add(skb->truesize, &sk->sk_rmem_alloc); | |
464 | sk->sk_forward_alloc -= skb->truesize; | |
465 | } | |
466 | ||
467 | static inline void sk_stream_free_skb(struct sock *sk, struct sk_buff *skb) | |
468 | { | |
dc6de336 | 469 | skb_truesize_check(skb); |
1da177e4 LT |
470 | sock_set_flag(sk, SOCK_QUEUE_SHRUNK); |
471 | sk->sk_wmem_queued -= skb->truesize; | |
472 | sk->sk_forward_alloc += skb->truesize; | |
473 | __kfree_skb(skb); | |
474 | } | |
475 | ||
476 | /* The per-socket spinlock must be held here. */ | |
9ee6b535 SH |
477 | static inline void sk_add_backlog(struct sock *sk, struct sk_buff *skb) |
478 | { | |
479 | if (!sk->sk_backlog.tail) { | |
480 | sk->sk_backlog.head = sk->sk_backlog.tail = skb; | |
481 | } else { | |
482 | sk->sk_backlog.tail->next = skb; | |
483 | sk->sk_backlog.tail = skb; | |
484 | } | |
485 | skb->next = NULL; | |
486 | } | |
1da177e4 | 487 | |
cfcabdcc SH |
488 | #define sk_wait_event(__sk, __timeo, __condition) \ |
489 | ({ int __rc; \ | |
490 | release_sock(__sk); \ | |
491 | __rc = __condition; \ | |
492 | if (!__rc) { \ | |
493 | *(__timeo) = schedule_timeout(*(__timeo)); \ | |
494 | } \ | |
495 | lock_sock(__sk); \ | |
496 | __rc = __condition; \ | |
497 | __rc; \ | |
498 | }) | |
1da177e4 LT |
499 | |
500 | extern int sk_stream_wait_connect(struct sock *sk, long *timeo_p); | |
501 | extern int sk_stream_wait_memory(struct sock *sk, long *timeo_p); | |
502 | extern void sk_stream_wait_close(struct sock *sk, long timeo_p); | |
503 | extern int sk_stream_error(struct sock *sk, int flags, int err); | |
504 | extern void sk_stream_kill_queues(struct sock *sk); | |
505 | ||
506 | extern int sk_wait_data(struct sock *sk, long *timeo); | |
507 | ||
60236fdd | 508 | struct request_sock_ops; |
6d6ee43e | 509 | struct timewait_sock_ops; |
2e6599cb | 510 | |
1da177e4 LT |
511 | /* Networking protocol blocks we attach to sockets. |
512 | * socket layer -> transport layer interface | |
513 | * transport -> network interface is defined by struct inet_proto | |
514 | */ | |
515 | struct proto { | |
516 | void (*close)(struct sock *sk, | |
517 | long timeout); | |
518 | int (*connect)(struct sock *sk, | |
519 | struct sockaddr *uaddr, | |
520 | int addr_len); | |
521 | int (*disconnect)(struct sock *sk, int flags); | |
522 | ||
523 | struct sock * (*accept) (struct sock *sk, int flags, int *err); | |
524 | ||
525 | int (*ioctl)(struct sock *sk, int cmd, | |
526 | unsigned long arg); | |
527 | int (*init)(struct sock *sk); | |
528 | int (*destroy)(struct sock *sk); | |
529 | void (*shutdown)(struct sock *sk, int how); | |
530 | int (*setsockopt)(struct sock *sk, int level, | |
531 | int optname, char __user *optval, | |
532 | int optlen); | |
533 | int (*getsockopt)(struct sock *sk, int level, | |
534 | int optname, char __user *optval, | |
535 | int __user *option); | |
3fdadf7d DM |
536 | int (*compat_setsockopt)(struct sock *sk, |
537 | int level, | |
538 | int optname, char __user *optval, | |
539 | int optlen); | |
540 | int (*compat_getsockopt)(struct sock *sk, | |
541 | int level, | |
542 | int optname, char __user *optval, | |
543 | int __user *option); | |
1da177e4 LT |
544 | int (*sendmsg)(struct kiocb *iocb, struct sock *sk, |
545 | struct msghdr *msg, size_t len); | |
546 | int (*recvmsg)(struct kiocb *iocb, struct sock *sk, | |
547 | struct msghdr *msg, | |
548 | size_t len, int noblock, int flags, | |
549 | int *addr_len); | |
550 | int (*sendpage)(struct sock *sk, struct page *page, | |
551 | int offset, size_t size, int flags); | |
552 | int (*bind)(struct sock *sk, | |
553 | struct sockaddr *uaddr, int addr_len); | |
554 | ||
555 | int (*backlog_rcv) (struct sock *sk, | |
556 | struct sk_buff *skb); | |
557 | ||
558 | /* Keeping track of sk's, looking them up, and port selection methods. */ | |
559 | void (*hash)(struct sock *sk); | |
560 | void (*unhash)(struct sock *sk); | |
561 | int (*get_port)(struct sock *sk, unsigned short snum); | |
562 | ||
286ab3d4 ED |
563 | #ifdef CONFIG_SMP |
564 | /* Keeping track of sockets in use */ | |
565 | void (*inuse_add)(struct proto *prot, int inc); | |
566 | int (*inuse_getval)(const struct proto *prot); | |
567 | int *inuse_ptr; | |
568 | #else | |
569 | int inuse; | |
570 | #endif | |
1da177e4 LT |
571 | /* Memory pressure */ |
572 | void (*enter_memory_pressure)(void); | |
573 | atomic_t *memory_allocated; /* Current allocated memory. */ | |
574 | atomic_t *sockets_allocated; /* Current number of sockets. */ | |
575 | /* | |
576 | * Pressure flag: try to collapse. | |
577 | * Technical note: it is used by multiple contexts non atomically. | |
578 | * All the sk_stream_mem_schedule() is of this nature: accounting | |
579 | * is strict, actions are advisory and have some latency. | |
580 | */ | |
581 | int *memory_pressure; | |
582 | int *sysctl_mem; | |
583 | int *sysctl_wmem; | |
584 | int *sysctl_rmem; | |
585 | int max_header; | |
586 | ||
e18b890b | 587 | struct kmem_cache *slab; |
1da177e4 LT |
588 | unsigned int obj_size; |
589 | ||
0a5578cf | 590 | atomic_t *orphan_count; |
8feaf0c0 | 591 | |
60236fdd | 592 | struct request_sock_ops *rsk_prot; |
6d6ee43e | 593 | struct timewait_sock_ops *twsk_prot; |
2e6599cb | 594 | |
1da177e4 LT |
595 | struct module *owner; |
596 | ||
597 | char name[32]; | |
598 | ||
599 | struct list_head node; | |
e6848976 ACM |
600 | #ifdef SOCK_REFCNT_DEBUG |
601 | atomic_t socks; | |
602 | #endif | |
1da177e4 LT |
603 | }; |
604 | ||
286ab3d4 ED |
605 | /* |
606 | * Special macros to let protos use a fast version of inuse{get|add} | |
607 | * using a static percpu variable per proto instead of an allocated one, | |
608 | * saving one dereference. | |
609 | * This might be changed if/when dynamic percpu vars become fast. | |
610 | */ | |
611 | #ifdef CONFIG_SMP | |
612 | # define DEFINE_PROTO_INUSE(NAME) \ | |
613 | static DEFINE_PER_CPU(int, NAME##_inuse); \ | |
614 | static void NAME##_inuse_add(struct proto *prot, int inc) \ | |
615 | { \ | |
616 | __get_cpu_var(NAME##_inuse) += inc; \ | |
617 | } \ | |
618 | \ | |
619 | static int NAME##_inuse_getval(const struct proto *prot)\ | |
620 | { \ | |
621 | int res = 0, cpu; \ | |
622 | \ | |
623 | for_each_possible_cpu(cpu) \ | |
624 | res += per_cpu(NAME##_inuse, cpu); \ | |
625 | return res; \ | |
626 | } | |
627 | # define REF_PROTO_INUSE(NAME) \ | |
628 | .inuse_add = NAME##_inuse_add, \ | |
629 | .inuse_getval = NAME##_inuse_getval, | |
630 | #else | |
631 | # define DEFINE_PROTO_INUSE(NAME) | |
632 | # define REF_PROTO_INUSE(NAME) | |
633 | #endif | |
634 | ||
1da177e4 LT |
635 | extern int proto_register(struct proto *prot, int alloc_slab); |
636 | extern void proto_unregister(struct proto *prot); | |
637 | ||
e6848976 ACM |
638 | #ifdef SOCK_REFCNT_DEBUG |
639 | static inline void sk_refcnt_debug_inc(struct sock *sk) | |
640 | { | |
641 | atomic_inc(&sk->sk_prot->socks); | |
642 | } | |
643 | ||
644 | static inline void sk_refcnt_debug_dec(struct sock *sk) | |
645 | { | |
646 | atomic_dec(&sk->sk_prot->socks); | |
647 | printk(KERN_DEBUG "%s socket %p released, %d are still alive\n", | |
648 | sk->sk_prot->name, sk, atomic_read(&sk->sk_prot->socks)); | |
649 | } | |
650 | ||
651 | static inline void sk_refcnt_debug_release(const struct sock *sk) | |
652 | { | |
653 | if (atomic_read(&sk->sk_refcnt) != 1) | |
654 | printk(KERN_DEBUG "Destruction of the %s socket %p delayed, refcnt=%d\n", | |
655 | sk->sk_prot->name, sk, atomic_read(&sk->sk_refcnt)); | |
656 | } | |
657 | #else /* SOCK_REFCNT_DEBUG */ | |
658 | #define sk_refcnt_debug_inc(sk) do { } while (0) | |
659 | #define sk_refcnt_debug_dec(sk) do { } while (0) | |
660 | #define sk_refcnt_debug_release(sk) do { } while (0) | |
661 | #endif /* SOCK_REFCNT_DEBUG */ | |
662 | ||
1da177e4 LT |
663 | /* Called with local bh disabled */ |
664 | static __inline__ void sock_prot_inc_use(struct proto *prot) | |
665 | { | |
286ab3d4 ED |
666 | #ifdef CONFIG_SMP |
667 | prot->inuse_add(prot, 1); | |
668 | #else | |
669 | prot->inuse++; | |
670 | #endif | |
1da177e4 LT |
671 | } |
672 | ||
673 | static __inline__ void sock_prot_dec_use(struct proto *prot) | |
674 | { | |
286ab3d4 ED |
675 | #ifdef CONFIG_SMP |
676 | prot->inuse_add(prot, -1); | |
677 | #else | |
678 | prot->inuse--; | |
679 | #endif | |
680 | } | |
681 | ||
682 | static __inline__ int sock_prot_inuse(struct proto *proto) | |
683 | { | |
684 | #ifdef CONFIG_SMP | |
685 | return proto->inuse_getval(proto); | |
686 | #else | |
687 | return proto->inuse; | |
688 | #endif | |
1da177e4 LT |
689 | } |
690 | ||
614c6cb4 ACM |
691 | /* With per-bucket locks this operation is not-atomic, so that |
692 | * this version is not worse. | |
693 | */ | |
694 | static inline void __sk_prot_rehash(struct sock *sk) | |
695 | { | |
696 | sk->sk_prot->unhash(sk); | |
697 | sk->sk_prot->hash(sk); | |
698 | } | |
699 | ||
1da177e4 LT |
700 | /* About 10 seconds */ |
701 | #define SOCK_DESTROY_TIME (10*HZ) | |
702 | ||
703 | /* Sockets 0-1023 can't be bound to unless you are superuser */ | |
704 | #define PROT_SOCK 1024 | |
705 | ||
706 | #define SHUTDOWN_MASK 3 | |
707 | #define RCV_SHUTDOWN 1 | |
708 | #define SEND_SHUTDOWN 2 | |
709 | ||
710 | #define SOCK_SNDBUF_LOCK 1 | |
711 | #define SOCK_RCVBUF_LOCK 2 | |
712 | #define SOCK_BINDADDR_LOCK 4 | |
713 | #define SOCK_BINDPORT_LOCK 8 | |
714 | ||
715 | /* sock_iocb: used to kick off async processing of socket ios */ | |
716 | struct sock_iocb { | |
717 | struct list_head list; | |
718 | ||
719 | int flags; | |
720 | int size; | |
721 | struct socket *sock; | |
722 | struct sock *sk; | |
723 | struct scm_cookie *scm; | |
724 | struct msghdr *msg, async_msg; | |
1da177e4 LT |
725 | struct kiocb *kiocb; |
726 | }; | |
727 | ||
728 | static inline struct sock_iocb *kiocb_to_siocb(struct kiocb *iocb) | |
729 | { | |
730 | return (struct sock_iocb *)iocb->private; | |
731 | } | |
732 | ||
733 | static inline struct kiocb *siocb_to_kiocb(struct sock_iocb *si) | |
734 | { | |
735 | return si->kiocb; | |
736 | } | |
737 | ||
738 | struct socket_alloc { | |
739 | struct socket socket; | |
740 | struct inode vfs_inode; | |
741 | }; | |
742 | ||
743 | static inline struct socket *SOCKET_I(struct inode *inode) | |
744 | { | |
745 | return &container_of(inode, struct socket_alloc, vfs_inode)->socket; | |
746 | } | |
747 | ||
748 | static inline struct inode *SOCK_INODE(struct socket *socket) | |
749 | { | |
750 | return &container_of(socket, struct socket_alloc, socket)->vfs_inode; | |
751 | } | |
752 | ||
753 | extern void __sk_stream_mem_reclaim(struct sock *sk); | |
754 | extern int sk_stream_mem_schedule(struct sock *sk, int size, int kind); | |
755 | ||
756 | #define SK_STREAM_MEM_QUANTUM ((int)PAGE_SIZE) | |
757 | ||
758 | static inline int sk_stream_pages(int amt) | |
759 | { | |
172589cc | 760 | return DIV_ROUND_UP(amt, SK_STREAM_MEM_QUANTUM); |
1da177e4 LT |
761 | } |
762 | ||
763 | static inline void sk_stream_mem_reclaim(struct sock *sk) | |
764 | { | |
765 | if (sk->sk_forward_alloc >= SK_STREAM_MEM_QUANTUM) | |
766 | __sk_stream_mem_reclaim(sk); | |
767 | } | |
768 | ||
1da177e4 LT |
769 | static inline int sk_stream_rmem_schedule(struct sock *sk, struct sk_buff *skb) |
770 | { | |
771 | return (int)skb->truesize <= sk->sk_forward_alloc || | |
772 | sk_stream_mem_schedule(sk, skb->truesize, 1); | |
773 | } | |
774 | ||
d80d99d6 HX |
775 | static inline int sk_stream_wmem_schedule(struct sock *sk, int size) |
776 | { | |
777 | return size <= sk->sk_forward_alloc || | |
778 | sk_stream_mem_schedule(sk, size, 0); | |
779 | } | |
780 | ||
1da177e4 LT |
781 | /* Used by processes to "lock" a socket state, so that |
782 | * interrupts and bottom half handlers won't change it | |
783 | * from under us. It essentially blocks any incoming | |
784 | * packets, so that we won't get any new data or any | |
785 | * packets that change the state of the socket. | |
786 | * | |
787 | * While locked, BH processing will add new packets to | |
788 | * the backlog queue. This queue is processed by the | |
789 | * owner of the socket lock right before it is released. | |
790 | * | |
791 | * Since ~2.3.5 it is also exclusive sleep lock serializing | |
792 | * accesses from user process context. | |
793 | */ | |
d2e9117c | 794 | #define sock_owned_by_user(sk) ((sk)->sk_lock.owned) |
1da177e4 | 795 | |
ed07536e PZ |
796 | /* |
797 | * Macro so as to not evaluate some arguments when | |
798 | * lockdep is not enabled. | |
799 | * | |
800 | * Mark both the sk_lock and the sk_lock.slock as a | |
801 | * per-address-family lock class. | |
802 | */ | |
803 | #define sock_lock_init_class_and_name(sk, sname, skey, name, key) \ | |
804 | do { \ | |
d2e9117c | 805 | sk->sk_lock.owned = 0; \ |
ed07536e PZ |
806 | init_waitqueue_head(&sk->sk_lock.wq); \ |
807 | spin_lock_init(&(sk)->sk_lock.slock); \ | |
808 | debug_check_no_locks_freed((void *)&(sk)->sk_lock, \ | |
809 | sizeof((sk)->sk_lock)); \ | |
810 | lockdep_set_class_and_name(&(sk)->sk_lock.slock, \ | |
811 | (skey), (sname)); \ | |
812 | lockdep_init_map(&(sk)->sk_lock.dep_map, (name), (key), 0); \ | |
813 | } while (0) | |
814 | ||
fcc70d5f PZ |
815 | extern void FASTCALL(lock_sock_nested(struct sock *sk, int subclass)); |
816 | ||
817 | static inline void lock_sock(struct sock *sk) | |
818 | { | |
819 | lock_sock_nested(sk, 0); | |
820 | } | |
821 | ||
1da177e4 LT |
822 | extern void FASTCALL(release_sock(struct sock *sk)); |
823 | ||
824 | /* BH context may only use the following locking interface. */ | |
825 | #define bh_lock_sock(__sk) spin_lock(&((__sk)->sk_lock.slock)) | |
c6366184 IM |
826 | #define bh_lock_sock_nested(__sk) \ |
827 | spin_lock_nested(&((__sk)->sk_lock.slock), \ | |
828 | SINGLE_DEPTH_NESTING) | |
1da177e4 LT |
829 | #define bh_unlock_sock(__sk) spin_unlock(&((__sk)->sk_lock.slock)) |
830 | ||
1b8d7ae4 | 831 | extern struct sock *sk_alloc(struct net *net, int family, |
dd0fc66f | 832 | gfp_t priority, |
6257ff21 | 833 | struct proto *prot); |
1da177e4 | 834 | extern void sk_free(struct sock *sk); |
87d11ceb | 835 | extern struct sock *sk_clone(const struct sock *sk, |
dd0fc66f | 836 | const gfp_t priority); |
1da177e4 LT |
837 | |
838 | extern struct sk_buff *sock_wmalloc(struct sock *sk, | |
839 | unsigned long size, int force, | |
dd0fc66f | 840 | gfp_t priority); |
1da177e4 LT |
841 | extern struct sk_buff *sock_rmalloc(struct sock *sk, |
842 | unsigned long size, int force, | |
dd0fc66f | 843 | gfp_t priority); |
1da177e4 LT |
844 | extern void sock_wfree(struct sk_buff *skb); |
845 | extern void sock_rfree(struct sk_buff *skb); | |
846 | ||
847 | extern int sock_setsockopt(struct socket *sock, int level, | |
848 | int op, char __user *optval, | |
849 | int optlen); | |
850 | ||
851 | extern int sock_getsockopt(struct socket *sock, int level, | |
852 | int op, char __user *optval, | |
853 | int __user *optlen); | |
854 | extern struct sk_buff *sock_alloc_send_skb(struct sock *sk, | |
855 | unsigned long size, | |
856 | int noblock, | |
857 | int *errcode); | |
86a76caf | 858 | extern void *sock_kmalloc(struct sock *sk, int size, |
dd0fc66f | 859 | gfp_t priority); |
1da177e4 LT |
860 | extern void sock_kfree_s(struct sock *sk, void *mem, int size); |
861 | extern void sk_send_sigurg(struct sock *sk); | |
862 | ||
863 | /* | |
864 | * Functions to fill in entries in struct proto_ops when a protocol | |
865 | * does not implement a particular function. | |
866 | */ | |
867 | extern int sock_no_bind(struct socket *, | |
868 | struct sockaddr *, int); | |
869 | extern int sock_no_connect(struct socket *, | |
870 | struct sockaddr *, int, int); | |
871 | extern int sock_no_socketpair(struct socket *, | |
872 | struct socket *); | |
873 | extern int sock_no_accept(struct socket *, | |
874 | struct socket *, int); | |
875 | extern int sock_no_getname(struct socket *, | |
876 | struct sockaddr *, int *, int); | |
877 | extern unsigned int sock_no_poll(struct file *, struct socket *, | |
878 | struct poll_table_struct *); | |
879 | extern int sock_no_ioctl(struct socket *, unsigned int, | |
880 | unsigned long); | |
881 | extern int sock_no_listen(struct socket *, int); | |
882 | extern int sock_no_shutdown(struct socket *, int); | |
883 | extern int sock_no_getsockopt(struct socket *, int , int, | |
884 | char __user *, int __user *); | |
885 | extern int sock_no_setsockopt(struct socket *, int, int, | |
886 | char __user *, int); | |
887 | extern int sock_no_sendmsg(struct kiocb *, struct socket *, | |
888 | struct msghdr *, size_t); | |
889 | extern int sock_no_recvmsg(struct kiocb *, struct socket *, | |
890 | struct msghdr *, size_t, int); | |
891 | extern int sock_no_mmap(struct file *file, | |
892 | struct socket *sock, | |
893 | struct vm_area_struct *vma); | |
894 | extern ssize_t sock_no_sendpage(struct socket *sock, | |
895 | struct page *page, | |
896 | int offset, size_t size, | |
897 | int flags); | |
898 | ||
899 | /* | |
900 | * Functions to fill in entries in struct proto_ops when a protocol | |
901 | * uses the inet style. | |
902 | */ | |
903 | extern int sock_common_getsockopt(struct socket *sock, int level, int optname, | |
904 | char __user *optval, int __user *optlen); | |
905 | extern int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock, | |
906 | struct msghdr *msg, size_t size, int flags); | |
907 | extern int sock_common_setsockopt(struct socket *sock, int level, int optname, | |
908 | char __user *optval, int optlen); | |
3fdadf7d DM |
909 | extern int compat_sock_common_getsockopt(struct socket *sock, int level, |
910 | int optname, char __user *optval, int __user *optlen); | |
911 | extern int compat_sock_common_setsockopt(struct socket *sock, int level, | |
912 | int optname, char __user *optval, int optlen); | |
1da177e4 LT |
913 | |
914 | extern void sk_common_release(struct sock *sk); | |
915 | ||
916 | /* | |
917 | * Default socket callbacks and setup code | |
918 | */ | |
919 | ||
920 | /* Initialise core socket variables */ | |
921 | extern void sock_init_data(struct socket *sock, struct sock *sk); | |
922 | ||
923 | /** | |
924 | * sk_filter - run a packet through a socket filter | |
925 | * @sk: sock associated with &sk_buff | |
926 | * @skb: buffer to filter | |
927 | * @needlock: set to 1 if the sock is not locked by caller. | |
928 | * | |
929 | * Run the filter code and then cut skb->data to correct size returned by | |
930 | * sk_run_filter. If pkt_len is 0 we toss packet. If skb->len is smaller | |
931 | * than pkt_len we keep whole skb->data. This is the socket level | |
932 | * wrapper to sk_run_filter. It returns 0 if the packet should | |
933 | * be accepted or -EPERM if the packet should be tossed. | |
934 | * | |
935 | */ | |
936 | ||
fda9ef5d | 937 | static inline int sk_filter(struct sock *sk, struct sk_buff *skb) |
1da177e4 LT |
938 | { |
939 | int err; | |
fda9ef5d | 940 | struct sk_filter *filter; |
1da177e4 LT |
941 | |
942 | err = security_sock_rcv_skb(sk, skb); | |
943 | if (err) | |
944 | return err; | |
945 | ||
fda9ef5d | 946 | rcu_read_lock_bh(); |
9d3e4442 | 947 | filter = rcu_dereference(sk->sk_filter); |
fda9ef5d DM |
948 | if (filter) { |
949 | unsigned int pkt_len = sk_run_filter(skb, filter->insns, | |
950 | filter->len); | |
951 | err = pkt_len ? pskb_trim(skb, pkt_len) : -EPERM; | |
1da177e4 | 952 | } |
fda9ef5d DM |
953 | rcu_read_unlock_bh(); |
954 | ||
1da177e4 LT |
955 | return err; |
956 | } | |
957 | ||
dc9b3346 PB |
958 | /** |
959 | * sk_filter_release: Release a socket filter | |
960 | * @sk: socket | |
961 | * @fp: filter to remove | |
962 | * | |
963 | * Remove a filter from a socket and release its resources. | |
964 | */ | |
965 | ||
309dd5fc PE |
966 | static inline void sk_filter_release(struct sk_filter *fp) |
967 | { | |
968 | if (atomic_dec_and_test(&fp->refcnt)) | |
47e958ea | 969 | kfree(fp); |
309dd5fc PE |
970 | } |
971 | ||
972 | static inline void sk_filter_uncharge(struct sock *sk, struct sk_filter *fp) | |
1da177e4 LT |
973 | { |
974 | unsigned int size = sk_filter_len(fp); | |
975 | ||
976 | atomic_sub(size, &sk->sk_omem_alloc); | |
309dd5fc | 977 | sk_filter_release(fp); |
1da177e4 LT |
978 | } |
979 | ||
980 | static inline void sk_filter_charge(struct sock *sk, struct sk_filter *fp) | |
981 | { | |
982 | atomic_inc(&fp->refcnt); | |
983 | atomic_add(sk_filter_len(fp), &sk->sk_omem_alloc); | |
984 | } | |
985 | ||
986 | /* | |
987 | * Socket reference counting postulates. | |
988 | * | |
989 | * * Each user of socket SHOULD hold a reference count. | |
990 | * * Each access point to socket (an hash table bucket, reference from a list, | |
991 | * running timer, skb in flight MUST hold a reference count. | |
992 | * * When reference count hits 0, it means it will never increase back. | |
993 | * * When reference count hits 0, it means that no references from | |
994 | * outside exist to this socket and current process on current CPU | |
995 | * is last user and may/should destroy this socket. | |
996 | * * sk_free is called from any context: process, BH, IRQ. When | |
997 | * it is called, socket has no references from outside -> sk_free | |
998 | * may release descendant resources allocated by the socket, but | |
999 | * to the time when it is called, socket is NOT referenced by any | |
1000 | * hash tables, lists etc. | |
1001 | * * Packets, delivered from outside (from network or from another process) | |
1002 | * and enqueued on receive/error queues SHOULD NOT grab reference count, | |
1003 | * when they sit in queue. Otherwise, packets will leak to hole, when | |
1004 | * socket is looked up by one cpu and unhasing is made by another CPU. | |
1005 | * It is true for udp/raw, netlink (leak to receive and error queues), tcp | |
1006 | * (leak to backlog). Packet socket does all the processing inside | |
1007 | * BR_NETPROTO_LOCK, so that it has not this race condition. UNIX sockets | |
1008 | * use separate SMP lock, so that they are prone too. | |
1009 | */ | |
1010 | ||
1011 | /* Ungrab socket and destroy it, if it was the last reference. */ | |
1012 | static inline void sock_put(struct sock *sk) | |
1013 | { | |
1014 | if (atomic_dec_and_test(&sk->sk_refcnt)) | |
1015 | sk_free(sk); | |
1016 | } | |
1017 | ||
58a5a7b9 ACM |
1018 | extern int sk_receive_skb(struct sock *sk, struct sk_buff *skb, |
1019 | const int nested); | |
25995ff5 | 1020 | |
1da177e4 LT |
1021 | /* Detach socket from process context. |
1022 | * Announce socket dead, detach it from wait queue and inode. | |
1023 | * Note that parent inode held reference count on this struct sock, | |
1024 | * we do not release it in this function, because protocol | |
1025 | * probably wants some additional cleanups or even continuing | |
1026 | * to work with this socket (TCP). | |
1027 | */ | |
1028 | static inline void sock_orphan(struct sock *sk) | |
1029 | { | |
1030 | write_lock_bh(&sk->sk_callback_lock); | |
1031 | sock_set_flag(sk, SOCK_DEAD); | |
1032 | sk->sk_socket = NULL; | |
1033 | sk->sk_sleep = NULL; | |
1034 | write_unlock_bh(&sk->sk_callback_lock); | |
1035 | } | |
1036 | ||
1037 | static inline void sock_graft(struct sock *sk, struct socket *parent) | |
1038 | { | |
1039 | write_lock_bh(&sk->sk_callback_lock); | |
1040 | sk->sk_sleep = &parent->wait; | |
1041 | parent->sk = sk; | |
1042 | sk->sk_socket = parent; | |
4237c75c | 1043 | security_sock_graft(sk, parent); |
1da177e4 LT |
1044 | write_unlock_bh(&sk->sk_callback_lock); |
1045 | } | |
1046 | ||
1047 | extern int sock_i_uid(struct sock *sk); | |
1048 | extern unsigned long sock_i_ino(struct sock *sk); | |
1049 | ||
1050 | static inline struct dst_entry * | |
1051 | __sk_dst_get(struct sock *sk) | |
1052 | { | |
1053 | return sk->sk_dst_cache; | |
1054 | } | |
1055 | ||
1056 | static inline struct dst_entry * | |
1057 | sk_dst_get(struct sock *sk) | |
1058 | { | |
1059 | struct dst_entry *dst; | |
1060 | ||
1061 | read_lock(&sk->sk_dst_lock); | |
1062 | dst = sk->sk_dst_cache; | |
1063 | if (dst) | |
1064 | dst_hold(dst); | |
1065 | read_unlock(&sk->sk_dst_lock); | |
1066 | return dst; | |
1067 | } | |
1068 | ||
1069 | static inline void | |
1070 | __sk_dst_set(struct sock *sk, struct dst_entry *dst) | |
1071 | { | |
1072 | struct dst_entry *old_dst; | |
1073 | ||
1074 | old_dst = sk->sk_dst_cache; | |
1075 | sk->sk_dst_cache = dst; | |
1076 | dst_release(old_dst); | |
1077 | } | |
1078 | ||
1079 | static inline void | |
1080 | sk_dst_set(struct sock *sk, struct dst_entry *dst) | |
1081 | { | |
1082 | write_lock(&sk->sk_dst_lock); | |
1083 | __sk_dst_set(sk, dst); | |
1084 | write_unlock(&sk->sk_dst_lock); | |
1085 | } | |
1086 | ||
1087 | static inline void | |
1088 | __sk_dst_reset(struct sock *sk) | |
1089 | { | |
1090 | struct dst_entry *old_dst; | |
1091 | ||
1092 | old_dst = sk->sk_dst_cache; | |
1093 | sk->sk_dst_cache = NULL; | |
1094 | dst_release(old_dst); | |
1095 | } | |
1096 | ||
1097 | static inline void | |
1098 | sk_dst_reset(struct sock *sk) | |
1099 | { | |
1100 | write_lock(&sk->sk_dst_lock); | |
1101 | __sk_dst_reset(sk); | |
1102 | write_unlock(&sk->sk_dst_lock); | |
1103 | } | |
1104 | ||
f0088a50 | 1105 | extern struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie); |
1da177e4 | 1106 | |
f0088a50 | 1107 | extern struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie); |
1da177e4 | 1108 | |
bcd76111 HX |
1109 | static inline int sk_can_gso(const struct sock *sk) |
1110 | { | |
1111 | return net_gso_ok(sk->sk_route_caps, sk->sk_gso_type); | |
1112 | } | |
1113 | ||
9958089a | 1114 | extern void sk_setup_caps(struct sock *sk, struct dst_entry *dst); |
6cbb0df7 | 1115 | |
1da177e4 LT |
1116 | static inline void sk_charge_skb(struct sock *sk, struct sk_buff *skb) |
1117 | { | |
1118 | sk->sk_wmem_queued += skb->truesize; | |
1119 | sk->sk_forward_alloc -= skb->truesize; | |
1120 | } | |
1121 | ||
1122 | static inline int skb_copy_to_page(struct sock *sk, char __user *from, | |
1123 | struct sk_buff *skb, struct page *page, | |
1124 | int off, int copy) | |
1125 | { | |
1126 | if (skb->ip_summed == CHECKSUM_NONE) { | |
1127 | int err = 0; | |
5084205f | 1128 | __wsum csum = csum_and_copy_from_user(from, |
1da177e4 LT |
1129 | page_address(page) + off, |
1130 | copy, 0, &err); | |
1131 | if (err) | |
1132 | return err; | |
1133 | skb->csum = csum_block_add(skb->csum, csum, skb->len); | |
1134 | } else if (copy_from_user(page_address(page) + off, from, copy)) | |
1135 | return -EFAULT; | |
1136 | ||
1137 | skb->len += copy; | |
1138 | skb->data_len += copy; | |
1139 | skb->truesize += copy; | |
1140 | sk->sk_wmem_queued += copy; | |
1141 | sk->sk_forward_alloc -= copy; | |
1142 | return 0; | |
1143 | } | |
1144 | ||
1145 | /* | |
1146 | * Queue a received datagram if it will fit. Stream and sequenced | |
1147 | * protocols can't normally use this as they need to fit buffers in | |
1148 | * and play with them. | |
1149 | * | |
1150 | * Inlined as it's very short and called for pretty much every | |
1151 | * packet ever received. | |
1152 | */ | |
1153 | ||
1154 | static inline void skb_set_owner_w(struct sk_buff *skb, struct sock *sk) | |
1155 | { | |
1156 | sock_hold(sk); | |
1157 | skb->sk = sk; | |
1158 | skb->destructor = sock_wfree; | |
1159 | atomic_add(skb->truesize, &sk->sk_wmem_alloc); | |
1160 | } | |
1161 | ||
1162 | static inline void skb_set_owner_r(struct sk_buff *skb, struct sock *sk) | |
1163 | { | |
1164 | skb->sk = sk; | |
1165 | skb->destructor = sock_rfree; | |
1166 | atomic_add(skb->truesize, &sk->sk_rmem_alloc); | |
1167 | } | |
1168 | ||
1169 | extern void sk_reset_timer(struct sock *sk, struct timer_list* timer, | |
1170 | unsigned long expires); | |
1171 | ||
1172 | extern void sk_stop_timer(struct sock *sk, struct timer_list* timer); | |
1173 | ||
f0088a50 | 1174 | extern int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb); |
1da177e4 LT |
1175 | |
1176 | static inline int sock_queue_err_skb(struct sock *sk, struct sk_buff *skb) | |
1177 | { | |
1178 | /* Cast skb->rcvbuf to unsigned... It's pointless, but reduces | |
1179 | number of warnings when compiling with -W --ANK | |
1180 | */ | |
1181 | if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >= | |
1182 | (unsigned)sk->sk_rcvbuf) | |
1183 | return -ENOMEM; | |
1184 | skb_set_owner_r(skb, sk); | |
1185 | skb_queue_tail(&sk->sk_error_queue, skb); | |
1186 | if (!sock_flag(sk, SOCK_DEAD)) | |
1187 | sk->sk_data_ready(sk, skb->len); | |
1188 | return 0; | |
1189 | } | |
1190 | ||
1191 | /* | |
1192 | * Recover an error report and clear atomically | |
1193 | */ | |
1194 | ||
1195 | static inline int sock_error(struct sock *sk) | |
1196 | { | |
c1cbe4b7 BL |
1197 | int err; |
1198 | if (likely(!sk->sk_err)) | |
1199 | return 0; | |
1200 | err = xchg(&sk->sk_err, 0); | |
1da177e4 LT |
1201 | return -err; |
1202 | } | |
1203 | ||
1204 | static inline unsigned long sock_wspace(struct sock *sk) | |
1205 | { | |
1206 | int amt = 0; | |
1207 | ||
1208 | if (!(sk->sk_shutdown & SEND_SHUTDOWN)) { | |
1209 | amt = sk->sk_sndbuf - atomic_read(&sk->sk_wmem_alloc); | |
1210 | if (amt < 0) | |
1211 | amt = 0; | |
1212 | } | |
1213 | return amt; | |
1214 | } | |
1215 | ||
1216 | static inline void sk_wake_async(struct sock *sk, int how, int band) | |
1217 | { | |
1218 | if (sk->sk_socket && sk->sk_socket->fasync_list) | |
1219 | sock_wake_async(sk->sk_socket, how, band); | |
1220 | } | |
1221 | ||
1222 | #define SOCK_MIN_SNDBUF 2048 | |
1223 | #define SOCK_MIN_RCVBUF 256 | |
1224 | ||
1225 | static inline void sk_stream_moderate_sndbuf(struct sock *sk) | |
1226 | { | |
1227 | if (!(sk->sk_userlocks & SOCK_SNDBUF_LOCK)) { | |
1228 | sk->sk_sndbuf = min(sk->sk_sndbuf, sk->sk_wmem_queued / 2); | |
1229 | sk->sk_sndbuf = max(sk->sk_sndbuf, SOCK_MIN_SNDBUF); | |
1230 | } | |
1231 | } | |
1232 | ||
1233 | static inline struct sk_buff *sk_stream_alloc_pskb(struct sock *sk, | |
86a76caf | 1234 | int size, int mem, |
dd0fc66f | 1235 | gfp_t gfp) |
1da177e4 | 1236 | { |
c65f7f00 | 1237 | struct sk_buff *skb; |
1da177e4 | 1238 | |
21df56c6 HX |
1239 | /* The TCP header must be at least 32-bit aligned. */ |
1240 | size = ALIGN(size, 4); | |
1241 | ||
fb93134d | 1242 | skb = alloc_skb_fclone(size + sk->sk_prot->max_header, gfp); |
1da177e4 LT |
1243 | if (skb) { |
1244 | skb->truesize += mem; | |
d80d99d6 | 1245 | if (sk_stream_wmem_schedule(sk, skb->truesize)) { |
fb93134d HX |
1246 | /* |
1247 | * Make sure that we have exactly size bytes | |
1248 | * available to the caller, no more, no less. | |
1249 | */ | |
1250 | skb_reserve(skb, skb_tailroom(skb) - size); | |
1da177e4 LT |
1251 | return skb; |
1252 | } | |
1253 | __kfree_skb(skb); | |
1254 | } else { | |
1255 | sk->sk_prot->enter_memory_pressure(); | |
1256 | sk_stream_moderate_sndbuf(sk); | |
1257 | } | |
1258 | return NULL; | |
1259 | } | |
1260 | ||
1261 | static inline struct sk_buff *sk_stream_alloc_skb(struct sock *sk, | |
86a76caf | 1262 | int size, |
dd0fc66f | 1263 | gfp_t gfp) |
1da177e4 LT |
1264 | { |
1265 | return sk_stream_alloc_pskb(sk, size, 0, gfp); | |
1266 | } | |
1267 | ||
1268 | static inline struct page *sk_stream_alloc_page(struct sock *sk) | |
1269 | { | |
1270 | struct page *page = NULL; | |
1271 | ||
ef015786 HX |
1272 | page = alloc_pages(sk->sk_allocation, 0); |
1273 | if (!page) { | |
1da177e4 LT |
1274 | sk->sk_prot->enter_memory_pressure(); |
1275 | sk_stream_moderate_sndbuf(sk); | |
1276 | } | |
1277 | return page; | |
1278 | } | |
1279 | ||
1da177e4 LT |
1280 | /* |
1281 | * Default write policy as shown to user space via poll/select/SIGIO | |
1282 | */ | |
1283 | static inline int sock_writeable(const struct sock *sk) | |
1284 | { | |
1285 | return atomic_read(&sk->sk_wmem_alloc) < (sk->sk_sndbuf / 2); | |
1286 | } | |
1287 | ||
dd0fc66f | 1288 | static inline gfp_t gfp_any(void) |
1da177e4 | 1289 | { |
4498121c | 1290 | return in_atomic() ? GFP_ATOMIC : GFP_KERNEL; |
1da177e4 LT |
1291 | } |
1292 | ||
1293 | static inline long sock_rcvtimeo(const struct sock *sk, int noblock) | |
1294 | { | |
1295 | return noblock ? 0 : sk->sk_rcvtimeo; | |
1296 | } | |
1297 | ||
1298 | static inline long sock_sndtimeo(const struct sock *sk, int noblock) | |
1299 | { | |
1300 | return noblock ? 0 : sk->sk_sndtimeo; | |
1301 | } | |
1302 | ||
1303 | static inline int sock_rcvlowat(const struct sock *sk, int waitall, int len) | |
1304 | { | |
1305 | return (waitall ? len : min_t(int, sk->sk_rcvlowat, len)) ? : 1; | |
1306 | } | |
1307 | ||
1308 | /* Alas, with timeout socket operations are not restartable. | |
1309 | * Compare this to poll(). | |
1310 | */ | |
1311 | static inline int sock_intr_errno(long timeo) | |
1312 | { | |
1313 | return timeo == MAX_SCHEDULE_TIMEOUT ? -ERESTARTSYS : -EINTR; | |
1314 | } | |
1315 | ||
92f37fd2 ED |
1316 | extern void __sock_recv_timestamp(struct msghdr *msg, struct sock *sk, |
1317 | struct sk_buff *skb); | |
1318 | ||
1da177e4 LT |
1319 | static __inline__ void |
1320 | sock_recv_timestamp(struct msghdr *msg, struct sock *sk, struct sk_buff *skb) | |
1321 | { | |
b7aa0bf7 | 1322 | ktime_t kt = skb->tstamp; |
a61bbcf2 | 1323 | |
92f37fd2 ED |
1324 | if (sock_flag(sk, SOCK_RCVTSTAMP)) |
1325 | __sock_recv_timestamp(msg, sk, skb); | |
1326 | else | |
b7aa0bf7 | 1327 | sk->sk_stamp = kt; |
1da177e4 LT |
1328 | } |
1329 | ||
1330 | /** | |
1331 | * sk_eat_skb - Release a skb if it is no longer needed | |
4dc3b16b PP |
1332 | * @sk: socket to eat this skb from |
1333 | * @skb: socket buffer to eat | |
f4b8ea78 | 1334 | * @copied_early: flag indicating whether DMA operations copied this data early |
1da177e4 LT |
1335 | * |
1336 | * This routine must be called with interrupts disabled or with the socket | |
1337 | * locked so that the sk_buff queue operation is ok. | |
1338 | */ | |
624d1164 CL |
1339 | #ifdef CONFIG_NET_DMA |
1340 | static inline void sk_eat_skb(struct sock *sk, struct sk_buff *skb, int copied_early) | |
1341 | { | |
1342 | __skb_unlink(skb, &sk->sk_receive_queue); | |
1343 | if (!copied_early) | |
1344 | __kfree_skb(skb); | |
1345 | else | |
1346 | __skb_queue_tail(&sk->sk_async_wait_queue, skb); | |
1347 | } | |
1348 | #else | |
1349 | static inline void sk_eat_skb(struct sock *sk, struct sk_buff *skb, int copied_early) | |
1da177e4 LT |
1350 | { |
1351 | __skb_unlink(skb, &sk->sk_receive_queue); | |
1352 | __kfree_skb(skb); | |
1353 | } | |
624d1164 | 1354 | #endif |
1da177e4 LT |
1355 | |
1356 | extern void sock_enable_timestamp(struct sock *sk); | |
1357 | extern int sock_get_timestamp(struct sock *, struct timeval __user *); | |
ae40eb1e | 1358 | extern int sock_get_timestampns(struct sock *, struct timespec __user *); |
1da177e4 LT |
1359 | |
1360 | /* | |
1361 | * Enable debug/info messages | |
1362 | */ | |
a2a316fd SH |
1363 | extern int net_msg_warn; |
1364 | #define NETDEBUG(fmt, args...) \ | |
1365 | do { if (net_msg_warn) printk(fmt,##args); } while (0) | |
1da177e4 | 1366 | |
a2a316fd SH |
1367 | #define LIMIT_NETDEBUG(fmt, args...) \ |
1368 | do { if (net_msg_warn && net_ratelimit()) printk(fmt,##args); } while(0) | |
1da177e4 LT |
1369 | |
1370 | /* | |
1371 | * Macros for sleeping on a socket. Use them like this: | |
1372 | * | |
1373 | * SOCK_SLEEP_PRE(sk) | |
1374 | * if (condition) | |
1375 | * schedule(); | |
1376 | * SOCK_SLEEP_POST(sk) | |
1377 | * | |
1378 | * N.B. These are now obsolete and were, afaik, only ever used in DECnet | |
1379 | * and when the last use of them in DECnet has gone, I'm intending to | |
1380 | * remove them. | |
1381 | */ | |
1382 | ||
1383 | #define SOCK_SLEEP_PRE(sk) { struct task_struct *tsk = current; \ | |
1384 | DECLARE_WAITQUEUE(wait, tsk); \ | |
1385 | tsk->state = TASK_INTERRUPTIBLE; \ | |
1386 | add_wait_queue((sk)->sk_sleep, &wait); \ | |
1387 | release_sock(sk); | |
1388 | ||
1389 | #define SOCK_SLEEP_POST(sk) tsk->state = TASK_RUNNING; \ | |
1390 | remove_wait_queue((sk)->sk_sleep, &wait); \ | |
1391 | lock_sock(sk); \ | |
1392 | } | |
1393 | ||
1394 | static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool) | |
1395 | { | |
1396 | if (valbool) | |
1397 | sock_set_flag(sk, bit); | |
1398 | else | |
1399 | sock_reset_flag(sk, bit); | |
1400 | } | |
1401 | ||
1402 | extern __u32 sysctl_wmem_max; | |
1403 | extern __u32 sysctl_rmem_max; | |
1404 | ||
20380731 ACM |
1405 | extern void sk_init(void); |
1406 | ||
1407 | #ifdef CONFIG_SYSCTL | |
1408 | extern struct ctl_table core_table[]; | |
20380731 ACM |
1409 | #endif |
1410 | ||
6baf1f41 DM |
1411 | extern int sysctl_optmem_max; |
1412 | ||
20380731 ACM |
1413 | extern __u32 sysctl_wmem_default; |
1414 | extern __u32 sysctl_rmem_default; | |
20380731 | 1415 | |
1da177e4 | 1416 | #endif /* _SOCK_H */ |