]>
Commit | Line | Data |
---|---|---|
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 | 53 | #include <linux/security.h> |
5a0e3ad6 | 54 | #include <linux/slab.h> |
1da177e4 LT |
55 | |
56 | #include <linux/filter.h> | |
88ab1932 | 57 | #include <linux/rculist_nulls.h> |
a57de0b4 | 58 | #include <linux/poll.h> |
1da177e4 | 59 | |
c31504dc | 60 | #include <linux/atomic.h> |
1da177e4 LT |
61 | #include <net/dst.h> |
62 | #include <net/checksum.h> | |
63 | ||
64 | /* | |
65 | * This structure really needs to be cleaned up. | |
66 | * Most of it is for TCP, and not used by any of | |
67 | * the other protocols. | |
68 | */ | |
69 | ||
70 | /* Define this to get the SOCK_DBG debugging facility. */ | |
71 | #define SOCK_DEBUGGING | |
72 | #ifdef SOCK_DEBUGGING | |
73 | #define SOCK_DEBUG(sk, msg...) do { if ((sk) && sock_flag((sk), SOCK_DBG)) \ | |
74 | printk(KERN_DEBUG msg); } while (0) | |
75 | #else | |
4cd9029d | 76 | /* Validate arguments and do nothing */ |
1183f383 | 77 | static inline void __attribute__ ((format (printf, 2, 3))) |
4cd9029d SH |
78 | SOCK_DEBUG(struct sock *sk, const char *msg, ...) |
79 | { | |
80 | } | |
1da177e4 LT |
81 | #endif |
82 | ||
83 | /* This is the per-socket lock. The spinlock provides a synchronization | |
84 | * between user contexts and software interrupt processing, whereas the | |
85 | * mini-semaphore synchronizes multiple users amongst themselves. | |
86 | */ | |
1da177e4 LT |
87 | typedef struct { |
88 | spinlock_t slock; | |
d2e9117c | 89 | int owned; |
1da177e4 | 90 | wait_queue_head_t wq; |
a5b5bb9a IM |
91 | /* |
92 | * We express the mutex-alike socket_lock semantics | |
93 | * to the lock validator by explicitly managing | |
94 | * the slock as a lock variant (in addition to | |
95 | * the slock itself): | |
96 | */ | |
97 | #ifdef CONFIG_DEBUG_LOCK_ALLOC | |
98 | struct lockdep_map dep_map; | |
99 | #endif | |
1da177e4 LT |
100 | } socket_lock_t; |
101 | ||
1da177e4 | 102 | struct sock; |
8feaf0c0 | 103 | struct proto; |
0eeb8ffc | 104 | struct net; |
1da177e4 LT |
105 | |
106 | /** | |
4dc3b16b | 107 | * struct sock_common - minimal network layer representation of sockets |
4dc6dc71 | 108 | * @skc_node: main hash linkage for various protocol lookup tables |
512615b6 | 109 | * @skc_nulls_node: main hash linkage for TCP/UDP/UDP-Lite protocol |
4dc6dc71 | 110 | * @skc_refcnt: reference count |
e022f0b4 | 111 | * @skc_tx_queue_mapping: tx queue number for this connection |
4dc6dc71 | 112 | * @skc_hash: hash value used with various protocol lookup tables |
d4cada4a | 113 | * @skc_u16hashes: two u16 hash values used by UDP lookup tables |
4dc3b16b PP |
114 | * @skc_family: network address family |
115 | * @skc_state: Connection state | |
116 | * @skc_reuse: %SO_REUSEADDR setting | |
117 | * @skc_bound_dev_if: bound device index if != 0 | |
4dc3b16b | 118 | * @skc_bind_node: bind hash linkage for various protocol lookup tables |
512615b6 | 119 | * @skc_portaddr_node: second hash linkage for UDP/UDP-Lite protocol |
8feaf0c0 | 120 | * @skc_prot: protocol handlers inside a network family |
07feaebf | 121 | * @skc_net: reference to the network namespace of this socket |
4dc3b16b PP |
122 | * |
123 | * This is the minimal network layer representation of sockets, the header | |
8feaf0c0 ACM |
124 | * for struct sock and struct inet_timewait_sock. |
125 | */ | |
1da177e4 | 126 | struct sock_common { |
4dc6dc71 ED |
127 | /* |
128 | * first fields are not copied in sock_copy() | |
129 | */ | |
88ab1932 ED |
130 | union { |
131 | struct hlist_node skc_node; | |
132 | struct hlist_nulls_node skc_nulls_node; | |
133 | }; | |
1da177e4 | 134 | atomic_t skc_refcnt; |
e022f0b4 | 135 | int skc_tx_queue_mapping; |
4dc6dc71 | 136 | |
d4cada4a ED |
137 | union { |
138 | unsigned int skc_hash; | |
139 | __u16 skc_u16hashes[2]; | |
140 | }; | |
4dc6dc71 ED |
141 | unsigned short skc_family; |
142 | volatile unsigned char skc_state; | |
143 | unsigned char skc_reuse; | |
144 | int skc_bound_dev_if; | |
512615b6 ED |
145 | union { |
146 | struct hlist_node skc_bind_node; | |
147 | struct hlist_nulls_node skc_portaddr_node; | |
148 | }; | |
8feaf0c0 | 149 | struct proto *skc_prot; |
3b1e0a65 | 150 | #ifdef CONFIG_NET_NS |
07feaebf | 151 | struct net *skc_net; |
3b1e0a65 | 152 | #endif |
1da177e4 LT |
153 | }; |
154 | ||
155 | /** | |
156 | * struct sock - network layer representation of sockets | |
8feaf0c0 | 157 | * @__sk_common: shared layout with inet_timewait_sock |
4dc3b16b PP |
158 | * @sk_shutdown: mask of %SEND_SHUTDOWN and/or %RCV_SHUTDOWN |
159 | * @sk_userlocks: %SO_SNDBUF and %SO_RCVBUF settings | |
160 | * @sk_lock: synchronizer | |
161 | * @sk_rcvbuf: size of receive buffer in bytes | |
43815482 | 162 | * @sk_wq: sock wait queue and async head |
4dc3b16b PP |
163 | * @sk_dst_cache: destination cache |
164 | * @sk_dst_lock: destination cache lock | |
165 | * @sk_policy: flow policy | |
166 | * @sk_rmem_alloc: receive queue bytes committed | |
167 | * @sk_receive_queue: incoming packets | |
168 | * @sk_wmem_alloc: transmit queue bytes committed | |
169 | * @sk_write_queue: Packet sending queue | |
97fc2f08 | 170 | * @sk_async_wait_queue: DMA copied packets |
4dc3b16b PP |
171 | * @sk_omem_alloc: "o" is "option" or "other" |
172 | * @sk_wmem_queued: persistent queue size | |
173 | * @sk_forward_alloc: space allocated forward | |
174 | * @sk_allocation: allocation mode | |
175 | * @sk_sndbuf: size of send buffer in bytes | |
33c732c3 | 176 | * @sk_flags: %SO_LINGER (l_onoff), %SO_BROADCAST, %SO_KEEPALIVE, |
20d49473 | 177 | * %SO_OOBINLINE settings, %SO_TIMESTAMPING settings |
4dc3b16b PP |
178 | * @sk_no_check: %SO_NO_CHECK setting, wether or not checkup packets |
179 | * @sk_route_caps: route capabilities (e.g. %NETIF_F_TSO) | |
a465419b | 180 | * @sk_route_nocaps: forbidden route capabilities (e.g NETIF_F_GSO_MASK) |
bcd76111 | 181 | * @sk_gso_type: GSO type (e.g. %SKB_GSO_TCPV4) |
82cc1a7a | 182 | * @sk_gso_max_size: Maximum GSO segment size to build |
4dc3b16b | 183 | * @sk_lingertime: %SO_LINGER l_linger setting |
4dc3b16b PP |
184 | * @sk_backlog: always used with the per-socket spinlock held |
185 | * @sk_callback_lock: used with the callbacks in the end of this struct | |
186 | * @sk_error_queue: rarely used | |
33c732c3 WC |
187 | * @sk_prot_creator: sk_prot of original sock creator (see ipv6_setsockopt, |
188 | * IPV6_ADDRFORM for instance) | |
4dc3b16b | 189 | * @sk_err: last error |
33c732c3 WC |
190 | * @sk_err_soft: errors that don't cause failure but are the cause of a |
191 | * persistent failure not just 'timed out' | |
cb61cb9b | 192 | * @sk_drops: raw/udp drops counter |
4dc3b16b PP |
193 | * @sk_ack_backlog: current listen backlog |
194 | * @sk_max_ack_backlog: listen backlog set in listen() | |
195 | * @sk_priority: %SO_PRIORITY setting | |
196 | * @sk_type: socket type (%SOCK_STREAM, etc) | |
197 | * @sk_protocol: which protocol this socket belongs in this network family | |
53c3fa20 RD |
198 | * @sk_peer_pid: &struct pid for this socket's peer |
199 | * @sk_peer_cred: %SO_PEERCRED setting | |
4dc3b16b PP |
200 | * @sk_rcvlowat: %SO_RCVLOWAT setting |
201 | * @sk_rcvtimeo: %SO_RCVTIMEO setting | |
202 | * @sk_sndtimeo: %SO_SNDTIMEO setting | |
c58dc01b | 203 | * @sk_rxhash: flow hash received from netif layer |
4dc3b16b PP |
204 | * @sk_filter: socket filtering instructions |
205 | * @sk_protinfo: private area, net family specific, when not using slab | |
206 | * @sk_timer: sock cleanup timer | |
207 | * @sk_stamp: time stamp of last packet received | |
208 | * @sk_socket: Identd and reporting IO signals | |
209 | * @sk_user_data: RPC layer private data | |
210 | * @sk_sndmsg_page: cached page for sendmsg | |
211 | * @sk_sndmsg_off: cached offset for sendmsg | |
212 | * @sk_send_head: front of stuff to transmit | |
67be2dd1 | 213 | * @sk_security: used by security modules |
31729363 | 214 | * @sk_mark: generic packet mark |
53c3fa20 | 215 | * @sk_classid: this socket's cgroup classid |
4dc3b16b PP |
216 | * @sk_write_pending: a write to stream socket waits to start |
217 | * @sk_state_change: callback to indicate change in the state of the sock | |
218 | * @sk_data_ready: callback to indicate there is data to be processed | |
219 | * @sk_write_space: callback to indicate there is bf sending space available | |
220 | * @sk_error_report: callback to indicate errors (e.g. %MSG_ERRQUEUE) | |
221 | * @sk_backlog_rcv: callback to process the backlog | |
222 | * @sk_destruct: called at sock freeing time, i.e. when all refcnt == 0 | |
1da177e4 LT |
223 | */ |
224 | struct sock { | |
225 | /* | |
8feaf0c0 | 226 | * Now struct inet_timewait_sock also uses sock_common, so please just |
1da177e4 LT |
227 | * don't add nothing before this first member (__sk_common) --acme |
228 | */ | |
229 | struct sock_common __sk_common; | |
4dc6dc71 ED |
230 | #define sk_node __sk_common.skc_node |
231 | #define sk_nulls_node __sk_common.skc_nulls_node | |
232 | #define sk_refcnt __sk_common.skc_refcnt | |
e022f0b4 | 233 | #define sk_tx_queue_mapping __sk_common.skc_tx_queue_mapping |
4dc6dc71 ED |
234 | |
235 | #define sk_copy_start __sk_common.skc_hash | |
236 | #define sk_hash __sk_common.skc_hash | |
1da177e4 LT |
237 | #define sk_family __sk_common.skc_family |
238 | #define sk_state __sk_common.skc_state | |
239 | #define sk_reuse __sk_common.skc_reuse | |
240 | #define sk_bound_dev_if __sk_common.skc_bound_dev_if | |
1da177e4 | 241 | #define sk_bind_node __sk_common.skc_bind_node |
8feaf0c0 | 242 | #define sk_prot __sk_common.skc_prot |
07feaebf | 243 | #define sk_net __sk_common.skc_net |
1da177e4 | 244 | socket_lock_t sk_lock; |
b178bb3d | 245 | struct sk_buff_head sk_receive_queue; |
fa438ccf ED |
246 | /* |
247 | * The backlog queue is special, it is always used with | |
248 | * the per-socket spinlock held and requires low latency | |
249 | * access. Therefore we special case it's implementation. | |
b178bb3d ED |
250 | * Note : rmem_alloc is in this structure to fill a hole |
251 | * on 64bit arches, not because its logically part of | |
252 | * backlog. | |
fa438ccf ED |
253 | */ |
254 | struct { | |
b178bb3d ED |
255 | atomic_t rmem_alloc; |
256 | int len; | |
257 | struct sk_buff *head; | |
258 | struct sk_buff *tail; | |
fa438ccf | 259 | } sk_backlog; |
b178bb3d ED |
260 | #define sk_rmem_alloc sk_backlog.rmem_alloc |
261 | int sk_forward_alloc; | |
262 | #ifdef CONFIG_RPS | |
263 | __u32 sk_rxhash; | |
264 | #endif | |
265 | atomic_t sk_drops; | |
266 | int sk_rcvbuf; | |
267 | ||
268 | struct sk_filter __rcu *sk_filter; | |
43815482 | 269 | struct socket_wq *sk_wq; |
b178bb3d ED |
270 | |
271 | #ifdef CONFIG_NET_DMA | |
272 | struct sk_buff_head sk_async_wait_queue; | |
273 | #endif | |
274 | ||
def8b4fa | 275 | #ifdef CONFIG_XFRM |
1da177e4 | 276 | struct xfrm_policy *sk_policy[2]; |
def8b4fa | 277 | #endif |
b178bb3d ED |
278 | unsigned long sk_flags; |
279 | struct dst_entry *sk_dst_cache; | |
b6c6712a | 280 | spinlock_t sk_dst_lock; |
1da177e4 LT |
281 | atomic_t sk_wmem_alloc; |
282 | atomic_t sk_omem_alloc; | |
4e07a91c | 283 | int sk_sndbuf; |
1da177e4 | 284 | struct sk_buff_head sk_write_queue; |
b178bb3d ED |
285 | kmemcheck_bitfield_begin(flags); |
286 | unsigned int sk_shutdown : 2, | |
287 | sk_no_check : 2, | |
288 | sk_userlocks : 4, | |
289 | sk_protocol : 8, | |
290 | sk_type : 16; | |
291 | kmemcheck_bitfield_end(flags); | |
1da177e4 | 292 | int sk_wmem_queued; |
7d877f3b | 293 | gfp_t sk_allocation; |
1da177e4 | 294 | int sk_route_caps; |
a465419b | 295 | int sk_route_nocaps; |
bcd76111 | 296 | int sk_gso_type; |
82cc1a7a | 297 | unsigned int sk_gso_max_size; |
9932cf95 | 298 | int sk_rcvlowat; |
1da177e4 | 299 | unsigned long sk_lingertime; |
1da177e4 | 300 | struct sk_buff_head sk_error_queue; |
476e19cf | 301 | struct proto *sk_prot_creator; |
1da177e4 LT |
302 | rwlock_t sk_callback_lock; |
303 | int sk_err, | |
304 | sk_err_soft; | |
305 | unsigned short sk_ack_backlog; | |
306 | unsigned short sk_max_ack_backlog; | |
307 | __u32 sk_priority; | |
109f6e39 EB |
308 | struct pid *sk_peer_pid; |
309 | const struct cred *sk_peer_cred; | |
1da177e4 LT |
310 | long sk_rcvtimeo; |
311 | long sk_sndtimeo; | |
1da177e4 LT |
312 | void *sk_protinfo; |
313 | struct timer_list sk_timer; | |
b7aa0bf7 | 314 | ktime_t sk_stamp; |
1da177e4 LT |
315 | struct socket *sk_socket; |
316 | void *sk_user_data; | |
317 | struct page *sk_sndmsg_page; | |
318 | struct sk_buff *sk_send_head; | |
319 | __u32 sk_sndmsg_off; | |
320 | int sk_write_pending; | |
d5f64238 | 321 | #ifdef CONFIG_SECURITY |
1da177e4 | 322 | void *sk_security; |
d5f64238 | 323 | #endif |
4a19ec58 | 324 | __u32 sk_mark; |
f8451725 | 325 | u32 sk_classid; |
1da177e4 LT |
326 | void (*sk_state_change)(struct sock *sk); |
327 | void (*sk_data_ready)(struct sock *sk, int bytes); | |
328 | void (*sk_write_space)(struct sock *sk); | |
329 | void (*sk_error_report)(struct sock *sk); | |
330 | int (*sk_backlog_rcv)(struct sock *sk, | |
331 | struct sk_buff *skb); | |
332 | void (*sk_destruct)(struct sock *sk); | |
333 | }; | |
334 | ||
335 | /* | |
336 | * Hashed lists helper routines | |
337 | */ | |
c4146644 LZ |
338 | static inline struct sock *sk_entry(const struct hlist_node *node) |
339 | { | |
340 | return hlist_entry(node, struct sock, sk_node); | |
341 | } | |
342 | ||
e48c414e | 343 | static inline struct sock *__sk_head(const struct hlist_head *head) |
1da177e4 LT |
344 | { |
345 | return hlist_entry(head->first, struct sock, sk_node); | |
346 | } | |
347 | ||
e48c414e | 348 | static inline struct sock *sk_head(const struct hlist_head *head) |
1da177e4 LT |
349 | { |
350 | return hlist_empty(head) ? NULL : __sk_head(head); | |
351 | } | |
352 | ||
88ab1932 ED |
353 | static inline struct sock *__sk_nulls_head(const struct hlist_nulls_head *head) |
354 | { | |
355 | return hlist_nulls_entry(head->first, struct sock, sk_nulls_node); | |
356 | } | |
357 | ||
358 | static inline struct sock *sk_nulls_head(const struct hlist_nulls_head *head) | |
359 | { | |
360 | return hlist_nulls_empty(head) ? NULL : __sk_nulls_head(head); | |
361 | } | |
362 | ||
e48c414e | 363 | static inline struct sock *sk_next(const struct sock *sk) |
1da177e4 LT |
364 | { |
365 | return sk->sk_node.next ? | |
366 | hlist_entry(sk->sk_node.next, struct sock, sk_node) : NULL; | |
367 | } | |
368 | ||
88ab1932 ED |
369 | static inline struct sock *sk_nulls_next(const struct sock *sk) |
370 | { | |
371 | return (!is_a_nulls(sk->sk_nulls_node.next)) ? | |
372 | hlist_nulls_entry(sk->sk_nulls_node.next, | |
373 | struct sock, sk_nulls_node) : | |
374 | NULL; | |
375 | } | |
376 | ||
e48c414e | 377 | static inline int sk_unhashed(const struct sock *sk) |
1da177e4 LT |
378 | { |
379 | return hlist_unhashed(&sk->sk_node); | |
380 | } | |
381 | ||
e48c414e | 382 | static inline int sk_hashed(const struct sock *sk) |
1da177e4 | 383 | { |
da753bea | 384 | return !sk_unhashed(sk); |
1da177e4 LT |
385 | } |
386 | ||
387 | static __inline__ void sk_node_init(struct hlist_node *node) | |
388 | { | |
389 | node->pprev = NULL; | |
390 | } | |
391 | ||
88ab1932 ED |
392 | static __inline__ void sk_nulls_node_init(struct hlist_nulls_node *node) |
393 | { | |
394 | node->pprev = NULL; | |
395 | } | |
396 | ||
1da177e4 LT |
397 | static __inline__ void __sk_del_node(struct sock *sk) |
398 | { | |
399 | __hlist_del(&sk->sk_node); | |
400 | } | |
401 | ||
808f5114 | 402 | /* NB: equivalent to hlist_del_init_rcu */ |
1da177e4 LT |
403 | static __inline__ int __sk_del_node_init(struct sock *sk) |
404 | { | |
405 | if (sk_hashed(sk)) { | |
406 | __sk_del_node(sk); | |
407 | sk_node_init(&sk->sk_node); | |
408 | return 1; | |
409 | } | |
410 | return 0; | |
411 | } | |
412 | ||
413 | /* Grab socket reference count. This operation is valid only | |
414 | when sk is ALREADY grabbed f.e. it is found in hash table | |
415 | or a list and the lookup is made under lock preventing hash table | |
416 | modifications. | |
417 | */ | |
418 | ||
419 | static inline void sock_hold(struct sock *sk) | |
420 | { | |
421 | atomic_inc(&sk->sk_refcnt); | |
422 | } | |
423 | ||
424 | /* Ungrab socket in the context, which assumes that socket refcnt | |
425 | cannot hit zero, f.e. it is true in context of any socketcall. | |
426 | */ | |
427 | static inline void __sock_put(struct sock *sk) | |
428 | { | |
429 | atomic_dec(&sk->sk_refcnt); | |
430 | } | |
431 | ||
432 | static __inline__ int sk_del_node_init(struct sock *sk) | |
433 | { | |
434 | int rc = __sk_del_node_init(sk); | |
435 | ||
436 | if (rc) { | |
437 | /* paranoid for a while -acme */ | |
438 | WARN_ON(atomic_read(&sk->sk_refcnt) == 1); | |
439 | __sock_put(sk); | |
440 | } | |
441 | return rc; | |
442 | } | |
808f5114 | 443 | #define sk_del_node_init_rcu(sk) sk_del_node_init(sk) |
1da177e4 | 444 | |
88ab1932 | 445 | static __inline__ int __sk_nulls_del_node_init_rcu(struct sock *sk) |
271b72c7 ED |
446 | { |
447 | if (sk_hashed(sk)) { | |
88ab1932 | 448 | hlist_nulls_del_init_rcu(&sk->sk_nulls_node); |
271b72c7 ED |
449 | return 1; |
450 | } | |
451 | return 0; | |
452 | } | |
453 | ||
88ab1932 | 454 | static __inline__ int sk_nulls_del_node_init_rcu(struct sock *sk) |
271b72c7 | 455 | { |
88ab1932 | 456 | int rc = __sk_nulls_del_node_init_rcu(sk); |
271b72c7 ED |
457 | |
458 | if (rc) { | |
459 | /* paranoid for a while -acme */ | |
460 | WARN_ON(atomic_read(&sk->sk_refcnt) == 1); | |
461 | __sock_put(sk); | |
462 | } | |
463 | return rc; | |
464 | } | |
465 | ||
1da177e4 LT |
466 | static __inline__ void __sk_add_node(struct sock *sk, struct hlist_head *list) |
467 | { | |
468 | hlist_add_head(&sk->sk_node, list); | |
469 | } | |
470 | ||
471 | static __inline__ void sk_add_node(struct sock *sk, struct hlist_head *list) | |
472 | { | |
473 | sock_hold(sk); | |
474 | __sk_add_node(sk, list); | |
475 | } | |
476 | ||
808f5114 | 477 | static __inline__ void sk_add_node_rcu(struct sock *sk, struct hlist_head *list) |
478 | { | |
479 | sock_hold(sk); | |
480 | hlist_add_head_rcu(&sk->sk_node, list); | |
481 | } | |
482 | ||
88ab1932 | 483 | static __inline__ void __sk_nulls_add_node_rcu(struct sock *sk, struct hlist_nulls_head *list) |
271b72c7 | 484 | { |
88ab1932 | 485 | hlist_nulls_add_head_rcu(&sk->sk_nulls_node, list); |
271b72c7 ED |
486 | } |
487 | ||
88ab1932 | 488 | static __inline__ void sk_nulls_add_node_rcu(struct sock *sk, struct hlist_nulls_head *list) |
271b72c7 ED |
489 | { |
490 | sock_hold(sk); | |
88ab1932 | 491 | __sk_nulls_add_node_rcu(sk, list); |
271b72c7 ED |
492 | } |
493 | ||
1da177e4 LT |
494 | static __inline__ void __sk_del_bind_node(struct sock *sk) |
495 | { | |
496 | __hlist_del(&sk->sk_bind_node); | |
497 | } | |
498 | ||
499 | static __inline__ void sk_add_bind_node(struct sock *sk, | |
500 | struct hlist_head *list) | |
501 | { | |
502 | hlist_add_head(&sk->sk_bind_node, list); | |
503 | } | |
504 | ||
505 | #define sk_for_each(__sk, node, list) \ | |
506 | hlist_for_each_entry(__sk, node, list, sk_node) | |
808f5114 | 507 | #define sk_for_each_rcu(__sk, node, list) \ |
508 | hlist_for_each_entry_rcu(__sk, node, list, sk_node) | |
88ab1932 ED |
509 | #define sk_nulls_for_each(__sk, node, list) \ |
510 | hlist_nulls_for_each_entry(__sk, node, list, sk_nulls_node) | |
511 | #define sk_nulls_for_each_rcu(__sk, node, list) \ | |
512 | hlist_nulls_for_each_entry_rcu(__sk, node, list, sk_nulls_node) | |
1da177e4 LT |
513 | #define sk_for_each_from(__sk, node) \ |
514 | if (__sk && ({ node = &(__sk)->sk_node; 1; })) \ | |
515 | hlist_for_each_entry_from(__sk, node, sk_node) | |
88ab1932 ED |
516 | #define sk_nulls_for_each_from(__sk, node) \ |
517 | if (__sk && ({ node = &(__sk)->sk_nulls_node; 1; })) \ | |
518 | hlist_nulls_for_each_entry_from(__sk, node, sk_nulls_node) | |
1da177e4 LT |
519 | #define sk_for_each_continue(__sk, node) \ |
520 | if (__sk && ({ node = &(__sk)->sk_node; 1; })) \ | |
521 | hlist_for_each_entry_continue(__sk, node, sk_node) | |
522 | #define sk_for_each_safe(__sk, node, tmp, list) \ | |
523 | hlist_for_each_entry_safe(__sk, node, tmp, list, sk_node) | |
524 | #define sk_for_each_bound(__sk, node, list) \ | |
525 | hlist_for_each_entry(__sk, node, list, sk_bind_node) | |
526 | ||
527 | /* Sock flags */ | |
528 | enum sock_flags { | |
529 | SOCK_DEAD, | |
530 | SOCK_DONE, | |
531 | SOCK_URGINLINE, | |
532 | SOCK_KEEPOPEN, | |
533 | SOCK_LINGER, | |
534 | SOCK_DESTROY, | |
535 | SOCK_BROADCAST, | |
536 | SOCK_TIMESTAMP, | |
537 | SOCK_ZAPPED, | |
538 | SOCK_USE_WRITE_QUEUE, /* whether to call sk->sk_write_space in sock_wfree */ | |
539 | SOCK_DBG, /* %SO_DEBUG setting */ | |
540 | SOCK_RCVTSTAMP, /* %SO_TIMESTAMP setting */ | |
92f37fd2 | 541 | SOCK_RCVTSTAMPNS, /* %SO_TIMESTAMPNS setting */ |
1da177e4 LT |
542 | SOCK_LOCALROUTE, /* route locally only, %SO_DONTROUTE setting */ |
543 | SOCK_QUEUE_SHRUNK, /* write queue has been shrunk recently */ | |
20d49473 PO |
544 | SOCK_TIMESTAMPING_TX_HARDWARE, /* %SOF_TIMESTAMPING_TX_HARDWARE */ |
545 | SOCK_TIMESTAMPING_TX_SOFTWARE, /* %SOF_TIMESTAMPING_TX_SOFTWARE */ | |
546 | SOCK_TIMESTAMPING_RX_HARDWARE, /* %SOF_TIMESTAMPING_RX_HARDWARE */ | |
547 | SOCK_TIMESTAMPING_RX_SOFTWARE, /* %SOF_TIMESTAMPING_RX_SOFTWARE */ | |
548 | SOCK_TIMESTAMPING_SOFTWARE, /* %SOF_TIMESTAMPING_SOFTWARE */ | |
549 | SOCK_TIMESTAMPING_RAW_HARDWARE, /* %SOF_TIMESTAMPING_RAW_HARDWARE */ | |
550 | SOCK_TIMESTAMPING_SYS_HARDWARE, /* %SOF_TIMESTAMPING_SYS_HARDWARE */ | |
bcdce719 | 551 | SOCK_FASYNC, /* fasync() active */ |
3b885787 | 552 | SOCK_RXQ_OVFL, |
1da177e4 LT |
553 | }; |
554 | ||
53b924b3 RB |
555 | static inline void sock_copy_flags(struct sock *nsk, struct sock *osk) |
556 | { | |
557 | nsk->sk_flags = osk->sk_flags; | |
558 | } | |
559 | ||
1da177e4 LT |
560 | static inline void sock_set_flag(struct sock *sk, enum sock_flags flag) |
561 | { | |
562 | __set_bit(flag, &sk->sk_flags); | |
563 | } | |
564 | ||
565 | static inline void sock_reset_flag(struct sock *sk, enum sock_flags flag) | |
566 | { | |
567 | __clear_bit(flag, &sk->sk_flags); | |
568 | } | |
569 | ||
570 | static inline int sock_flag(struct sock *sk, enum sock_flags flag) | |
571 | { | |
572 | return test_bit(flag, &sk->sk_flags); | |
573 | } | |
574 | ||
575 | static inline void sk_acceptq_removed(struct sock *sk) | |
576 | { | |
577 | sk->sk_ack_backlog--; | |
578 | } | |
579 | ||
580 | static inline void sk_acceptq_added(struct sock *sk) | |
581 | { | |
582 | sk->sk_ack_backlog++; | |
583 | } | |
584 | ||
585 | static inline int sk_acceptq_is_full(struct sock *sk) | |
586 | { | |
64a14651 | 587 | return sk->sk_ack_backlog > sk->sk_max_ack_backlog; |
1da177e4 LT |
588 | } |
589 | ||
590 | /* | |
591 | * Compute minimal free write space needed to queue new packets. | |
592 | */ | |
593 | static inline int sk_stream_min_wspace(struct sock *sk) | |
594 | { | |
8df09ea3 | 595 | return sk->sk_wmem_queued >> 1; |
1da177e4 LT |
596 | } |
597 | ||
598 | static inline int sk_stream_wspace(struct sock *sk) | |
599 | { | |
600 | return sk->sk_sndbuf - sk->sk_wmem_queued; | |
601 | } | |
602 | ||
603 | extern void sk_stream_write_space(struct sock *sk); | |
604 | ||
605 | static inline int sk_stream_memory_free(struct sock *sk) | |
606 | { | |
607 | return sk->sk_wmem_queued < sk->sk_sndbuf; | |
608 | } | |
609 | ||
8eae939f | 610 | /* OOB backlog add */ |
a3a858ff | 611 | static inline void __sk_add_backlog(struct sock *sk, struct sk_buff *skb) |
9ee6b535 | 612 | { |
7fee226a ED |
613 | /* dont let skb dst not refcounted, we are going to leave rcu lock */ |
614 | skb_dst_force(skb); | |
615 | ||
616 | if (!sk->sk_backlog.tail) | |
617 | sk->sk_backlog.head = skb; | |
618 | else | |
9ee6b535 | 619 | sk->sk_backlog.tail->next = skb; |
7fee226a ED |
620 | |
621 | sk->sk_backlog.tail = skb; | |
9ee6b535 SH |
622 | skb->next = NULL; |
623 | } | |
1da177e4 | 624 | |
c377411f ED |
625 | /* |
626 | * Take into account size of receive queue and backlog queue | |
627 | */ | |
628 | static inline bool sk_rcvqueues_full(const struct sock *sk, const struct sk_buff *skb) | |
629 | { | |
630 | unsigned int qsize = sk->sk_backlog.len + atomic_read(&sk->sk_rmem_alloc); | |
631 | ||
632 | return qsize + skb->truesize > sk->sk_rcvbuf; | |
633 | } | |
634 | ||
8eae939f | 635 | /* The per-socket spinlock must be held here. */ |
40456353 | 636 | static inline __must_check int sk_add_backlog(struct sock *sk, struct sk_buff *skb) |
8eae939f | 637 | { |
c377411f | 638 | if (sk_rcvqueues_full(sk, skb)) |
8eae939f ZY |
639 | return -ENOBUFS; |
640 | ||
a3a858ff | 641 | __sk_add_backlog(sk, skb); |
8eae939f ZY |
642 | sk->sk_backlog.len += skb->truesize; |
643 | return 0; | |
644 | } | |
645 | ||
c57943a1 PZ |
646 | static inline int sk_backlog_rcv(struct sock *sk, struct sk_buff *skb) |
647 | { | |
648 | return sk->sk_backlog_rcv(sk, skb); | |
649 | } | |
650 | ||
c58dc01b DM |
651 | static inline void sock_rps_record_flow(const struct sock *sk) |
652 | { | |
653 | #ifdef CONFIG_RPS | |
654 | struct rps_sock_flow_table *sock_flow_table; | |
655 | ||
656 | rcu_read_lock(); | |
657 | sock_flow_table = rcu_dereference(rps_sock_flow_table); | |
658 | rps_record_sock_flow(sock_flow_table, sk->sk_rxhash); | |
659 | rcu_read_unlock(); | |
660 | #endif | |
661 | } | |
662 | ||
663 | static inline void sock_rps_reset_flow(const struct sock *sk) | |
664 | { | |
665 | #ifdef CONFIG_RPS | |
666 | struct rps_sock_flow_table *sock_flow_table; | |
667 | ||
668 | rcu_read_lock(); | |
669 | sock_flow_table = rcu_dereference(rps_sock_flow_table); | |
670 | rps_reset_sock_flow(sock_flow_table, sk->sk_rxhash); | |
671 | rcu_read_unlock(); | |
672 | #endif | |
673 | } | |
674 | ||
675 | static inline void sock_rps_save_rxhash(struct sock *sk, u32 rxhash) | |
676 | { | |
677 | #ifdef CONFIG_RPS | |
678 | if (unlikely(sk->sk_rxhash != rxhash)) { | |
679 | sock_rps_reset_flow(sk); | |
680 | sk->sk_rxhash = rxhash; | |
681 | } | |
682 | #endif | |
683 | } | |
684 | ||
cfcabdcc SH |
685 | #define sk_wait_event(__sk, __timeo, __condition) \ |
686 | ({ int __rc; \ | |
687 | release_sock(__sk); \ | |
688 | __rc = __condition; \ | |
689 | if (!__rc) { \ | |
690 | *(__timeo) = schedule_timeout(*(__timeo)); \ | |
691 | } \ | |
692 | lock_sock(__sk); \ | |
693 | __rc = __condition; \ | |
694 | __rc; \ | |
695 | }) | |
1da177e4 LT |
696 | |
697 | extern int sk_stream_wait_connect(struct sock *sk, long *timeo_p); | |
698 | extern int sk_stream_wait_memory(struct sock *sk, long *timeo_p); | |
699 | extern void sk_stream_wait_close(struct sock *sk, long timeo_p); | |
700 | extern int sk_stream_error(struct sock *sk, int flags, int err); | |
701 | extern void sk_stream_kill_queues(struct sock *sk); | |
702 | ||
703 | extern int sk_wait_data(struct sock *sk, long *timeo); | |
704 | ||
60236fdd | 705 | struct request_sock_ops; |
6d6ee43e | 706 | struct timewait_sock_ops; |
ab1e0a13 | 707 | struct inet_hashinfo; |
fc8717ba | 708 | struct raw_hashinfo; |
2e6599cb | 709 | |
1da177e4 LT |
710 | /* Networking protocol blocks we attach to sockets. |
711 | * socket layer -> transport layer interface | |
712 | * transport -> network interface is defined by struct inet_proto | |
713 | */ | |
714 | struct proto { | |
715 | void (*close)(struct sock *sk, | |
716 | long timeout); | |
717 | int (*connect)(struct sock *sk, | |
718 | struct sockaddr *uaddr, | |
719 | int addr_len); | |
720 | int (*disconnect)(struct sock *sk, int flags); | |
721 | ||
722 | struct sock * (*accept) (struct sock *sk, int flags, int *err); | |
723 | ||
724 | int (*ioctl)(struct sock *sk, int cmd, | |
725 | unsigned long arg); | |
726 | int (*init)(struct sock *sk); | |
7d06b2e0 | 727 | void (*destroy)(struct sock *sk); |
1da177e4 LT |
728 | void (*shutdown)(struct sock *sk, int how); |
729 | int (*setsockopt)(struct sock *sk, int level, | |
730 | int optname, char __user *optval, | |
b7058842 | 731 | unsigned int optlen); |
1da177e4 LT |
732 | int (*getsockopt)(struct sock *sk, int level, |
733 | int optname, char __user *optval, | |
734 | int __user *option); | |
af01d537 | 735 | #ifdef CONFIG_COMPAT |
3fdadf7d DM |
736 | int (*compat_setsockopt)(struct sock *sk, |
737 | int level, | |
738 | int optname, char __user *optval, | |
b7058842 | 739 | unsigned int optlen); |
3fdadf7d DM |
740 | int (*compat_getsockopt)(struct sock *sk, |
741 | int level, | |
742 | int optname, char __user *optval, | |
743 | int __user *option); | |
af01d537 | 744 | #endif |
1da177e4 LT |
745 | int (*sendmsg)(struct kiocb *iocb, struct sock *sk, |
746 | struct msghdr *msg, size_t len); | |
747 | int (*recvmsg)(struct kiocb *iocb, struct sock *sk, | |
748 | struct msghdr *msg, | |
749 | size_t len, int noblock, int flags, | |
750 | int *addr_len); | |
751 | int (*sendpage)(struct sock *sk, struct page *page, | |
752 | int offset, size_t size, int flags); | |
753 | int (*bind)(struct sock *sk, | |
754 | struct sockaddr *uaddr, int addr_len); | |
755 | ||
756 | int (*backlog_rcv) (struct sock *sk, | |
757 | struct sk_buff *skb); | |
758 | ||
759 | /* Keeping track of sk's, looking them up, and port selection methods. */ | |
760 | void (*hash)(struct sock *sk); | |
761 | void (*unhash)(struct sock *sk); | |
719f8358 | 762 | void (*rehash)(struct sock *sk); |
1da177e4 LT |
763 | int (*get_port)(struct sock *sk, unsigned short snum); |
764 | ||
286ab3d4 | 765 | /* Keeping track of sockets in use */ |
65f76517 | 766 | #ifdef CONFIG_PROC_FS |
13ff3d6f | 767 | unsigned int inuse_idx; |
65f76517 | 768 | #endif |
ebb53d75 | 769 | |
1da177e4 | 770 | /* Memory pressure */ |
5c52ba17 | 771 | void (*enter_memory_pressure)(struct sock *sk); |
8d987e5c | 772 | atomic_long_t *memory_allocated; /* Current allocated memory. */ |
1748376b | 773 | struct percpu_counter *sockets_allocated; /* Current number of sockets. */ |
1da177e4 LT |
774 | /* |
775 | * Pressure flag: try to collapse. | |
776 | * Technical note: it is used by multiple contexts non atomically. | |
3ab224be | 777 | * All the __sk_mem_schedule() is of this nature: accounting |
1da177e4 LT |
778 | * is strict, actions are advisory and have some latency. |
779 | */ | |
780 | int *memory_pressure; | |
8d987e5c | 781 | long *sysctl_mem; |
1da177e4 LT |
782 | int *sysctl_wmem; |
783 | int *sysctl_rmem; | |
784 | int max_header; | |
7ba42910 | 785 | bool no_autobind; |
1da177e4 | 786 | |
271b72c7 | 787 | struct kmem_cache *slab; |
1da177e4 | 788 | unsigned int obj_size; |
271b72c7 | 789 | int slab_flags; |
1da177e4 | 790 | |
dd24c001 | 791 | struct percpu_counter *orphan_count; |
8feaf0c0 | 792 | |
60236fdd | 793 | struct request_sock_ops *rsk_prot; |
6d6ee43e | 794 | struct timewait_sock_ops *twsk_prot; |
2e6599cb | 795 | |
39d8cda7 PE |
796 | union { |
797 | struct inet_hashinfo *hashinfo; | |
645ca708 | 798 | struct udp_table *udp_table; |
fc8717ba | 799 | struct raw_hashinfo *raw_hash; |
39d8cda7 | 800 | } h; |
ab1e0a13 | 801 | |
1da177e4 LT |
802 | struct module *owner; |
803 | ||
804 | char name[32]; | |
805 | ||
806 | struct list_head node; | |
e6848976 ACM |
807 | #ifdef SOCK_REFCNT_DEBUG |
808 | atomic_t socks; | |
809 | #endif | |
1da177e4 LT |
810 | }; |
811 | ||
812 | extern int proto_register(struct proto *prot, int alloc_slab); | |
813 | extern void proto_unregister(struct proto *prot); | |
814 | ||
e6848976 ACM |
815 | #ifdef SOCK_REFCNT_DEBUG |
816 | static inline void sk_refcnt_debug_inc(struct sock *sk) | |
817 | { | |
818 | atomic_inc(&sk->sk_prot->socks); | |
819 | } | |
820 | ||
821 | static inline void sk_refcnt_debug_dec(struct sock *sk) | |
822 | { | |
823 | atomic_dec(&sk->sk_prot->socks); | |
824 | printk(KERN_DEBUG "%s socket %p released, %d are still alive\n", | |
825 | sk->sk_prot->name, sk, atomic_read(&sk->sk_prot->socks)); | |
826 | } | |
827 | ||
828 | static inline void sk_refcnt_debug_release(const struct sock *sk) | |
829 | { | |
830 | if (atomic_read(&sk->sk_refcnt) != 1) | |
831 | printk(KERN_DEBUG "Destruction of the %s socket %p delayed, refcnt=%d\n", | |
832 | sk->sk_prot->name, sk, atomic_read(&sk->sk_refcnt)); | |
833 | } | |
834 | #else /* SOCK_REFCNT_DEBUG */ | |
835 | #define sk_refcnt_debug_inc(sk) do { } while (0) | |
836 | #define sk_refcnt_debug_dec(sk) do { } while (0) | |
837 | #define sk_refcnt_debug_release(sk) do { } while (0) | |
838 | #endif /* SOCK_REFCNT_DEBUG */ | |
839 | ||
65f76517 ED |
840 | |
841 | #ifdef CONFIG_PROC_FS | |
1da177e4 | 842 | /* Called with local bh disabled */ |
c29a0bc4 PE |
843 | extern void sock_prot_inuse_add(struct net *net, struct proto *prot, int inc); |
844 | extern int sock_prot_inuse_get(struct net *net, struct proto *proto); | |
65f76517 | 845 | #else |
c29a0bc4 PE |
846 | static void inline sock_prot_inuse_add(struct net *net, struct proto *prot, |
847 | int inc) | |
65f76517 ED |
848 | { |
849 | } | |
65f76517 ED |
850 | #endif |
851 | ||
1da177e4 | 852 | |
614c6cb4 ACM |
853 | /* With per-bucket locks this operation is not-atomic, so that |
854 | * this version is not worse. | |
855 | */ | |
856 | static inline void __sk_prot_rehash(struct sock *sk) | |
857 | { | |
858 | sk->sk_prot->unhash(sk); | |
859 | sk->sk_prot->hash(sk); | |
860 | } | |
861 | ||
1da177e4 LT |
862 | /* About 10 seconds */ |
863 | #define SOCK_DESTROY_TIME (10*HZ) | |
864 | ||
865 | /* Sockets 0-1023 can't be bound to unless you are superuser */ | |
866 | #define PROT_SOCK 1024 | |
867 | ||
868 | #define SHUTDOWN_MASK 3 | |
869 | #define RCV_SHUTDOWN 1 | |
870 | #define SEND_SHUTDOWN 2 | |
871 | ||
872 | #define SOCK_SNDBUF_LOCK 1 | |
873 | #define SOCK_RCVBUF_LOCK 2 | |
874 | #define SOCK_BINDADDR_LOCK 4 | |
875 | #define SOCK_BINDPORT_LOCK 8 | |
876 | ||
877 | /* sock_iocb: used to kick off async processing of socket ios */ | |
878 | struct sock_iocb { | |
879 | struct list_head list; | |
880 | ||
881 | int flags; | |
882 | int size; | |
883 | struct socket *sock; | |
884 | struct sock *sk; | |
885 | struct scm_cookie *scm; | |
886 | struct msghdr *msg, async_msg; | |
1da177e4 LT |
887 | struct kiocb *kiocb; |
888 | }; | |
889 | ||
890 | static inline struct sock_iocb *kiocb_to_siocb(struct kiocb *iocb) | |
891 | { | |
892 | return (struct sock_iocb *)iocb->private; | |
893 | } | |
894 | ||
895 | static inline struct kiocb *siocb_to_kiocb(struct sock_iocb *si) | |
896 | { | |
897 | return si->kiocb; | |
898 | } | |
899 | ||
900 | struct socket_alloc { | |
901 | struct socket socket; | |
902 | struct inode vfs_inode; | |
903 | }; | |
904 | ||
905 | static inline struct socket *SOCKET_I(struct inode *inode) | |
906 | { | |
907 | return &container_of(inode, struct socket_alloc, vfs_inode)->socket; | |
908 | } | |
909 | ||
910 | static inline struct inode *SOCK_INODE(struct socket *socket) | |
911 | { | |
912 | return &container_of(socket, struct socket_alloc, socket)->vfs_inode; | |
913 | } | |
914 | ||
3ab224be HA |
915 | /* |
916 | * Functions for memory accounting | |
917 | */ | |
918 | extern int __sk_mem_schedule(struct sock *sk, int size, int kind); | |
919 | extern void __sk_mem_reclaim(struct sock *sk); | |
1da177e4 | 920 | |
3ab224be HA |
921 | #define SK_MEM_QUANTUM ((int)PAGE_SIZE) |
922 | #define SK_MEM_QUANTUM_SHIFT ilog2(SK_MEM_QUANTUM) | |
923 | #define SK_MEM_SEND 0 | |
924 | #define SK_MEM_RECV 1 | |
1da177e4 | 925 | |
3ab224be | 926 | static inline int sk_mem_pages(int amt) |
1da177e4 | 927 | { |
3ab224be | 928 | return (amt + SK_MEM_QUANTUM - 1) >> SK_MEM_QUANTUM_SHIFT; |
1da177e4 LT |
929 | } |
930 | ||
3ab224be | 931 | static inline int sk_has_account(struct sock *sk) |
1da177e4 | 932 | { |
3ab224be HA |
933 | /* return true if protocol supports memory accounting */ |
934 | return !!sk->sk_prot->memory_allocated; | |
1da177e4 LT |
935 | } |
936 | ||
3ab224be | 937 | static inline int sk_wmem_schedule(struct sock *sk, int size) |
1da177e4 | 938 | { |
3ab224be HA |
939 | if (!sk_has_account(sk)) |
940 | return 1; | |
941 | return size <= sk->sk_forward_alloc || | |
942 | __sk_mem_schedule(sk, size, SK_MEM_SEND); | |
1da177e4 LT |
943 | } |
944 | ||
3ab224be | 945 | static inline int sk_rmem_schedule(struct sock *sk, int size) |
d80d99d6 | 946 | { |
3ab224be HA |
947 | if (!sk_has_account(sk)) |
948 | return 1; | |
d80d99d6 | 949 | return size <= sk->sk_forward_alloc || |
3ab224be HA |
950 | __sk_mem_schedule(sk, size, SK_MEM_RECV); |
951 | } | |
952 | ||
953 | static inline void sk_mem_reclaim(struct sock *sk) | |
954 | { | |
955 | if (!sk_has_account(sk)) | |
956 | return; | |
957 | if (sk->sk_forward_alloc >= SK_MEM_QUANTUM) | |
958 | __sk_mem_reclaim(sk); | |
959 | } | |
960 | ||
9993e7d3 DM |
961 | static inline void sk_mem_reclaim_partial(struct sock *sk) |
962 | { | |
963 | if (!sk_has_account(sk)) | |
964 | return; | |
965 | if (sk->sk_forward_alloc > SK_MEM_QUANTUM) | |
966 | __sk_mem_reclaim(sk); | |
967 | } | |
968 | ||
3ab224be HA |
969 | static inline void sk_mem_charge(struct sock *sk, int size) |
970 | { | |
971 | if (!sk_has_account(sk)) | |
972 | return; | |
973 | sk->sk_forward_alloc -= size; | |
974 | } | |
975 | ||
976 | static inline void sk_mem_uncharge(struct sock *sk, int size) | |
977 | { | |
978 | if (!sk_has_account(sk)) | |
979 | return; | |
980 | sk->sk_forward_alloc += size; | |
981 | } | |
982 | ||
983 | static inline void sk_wmem_free_skb(struct sock *sk, struct sk_buff *skb) | |
984 | { | |
3ab224be HA |
985 | sock_set_flag(sk, SOCK_QUEUE_SHRUNK); |
986 | sk->sk_wmem_queued -= skb->truesize; | |
987 | sk_mem_uncharge(sk, skb->truesize); | |
988 | __kfree_skb(skb); | |
d80d99d6 HX |
989 | } |
990 | ||
1da177e4 LT |
991 | /* Used by processes to "lock" a socket state, so that |
992 | * interrupts and bottom half handlers won't change it | |
993 | * from under us. It essentially blocks any incoming | |
994 | * packets, so that we won't get any new data or any | |
995 | * packets that change the state of the socket. | |
996 | * | |
997 | * While locked, BH processing will add new packets to | |
998 | * the backlog queue. This queue is processed by the | |
999 | * owner of the socket lock right before it is released. | |
1000 | * | |
1001 | * Since ~2.3.5 it is also exclusive sleep lock serializing | |
1002 | * accesses from user process context. | |
1003 | */ | |
d2e9117c | 1004 | #define sock_owned_by_user(sk) ((sk)->sk_lock.owned) |
1da177e4 | 1005 | |
ed07536e PZ |
1006 | /* |
1007 | * Macro so as to not evaluate some arguments when | |
1008 | * lockdep is not enabled. | |
1009 | * | |
1010 | * Mark both the sk_lock and the sk_lock.slock as a | |
1011 | * per-address-family lock class. | |
1012 | */ | |
1013 | #define sock_lock_init_class_and_name(sk, sname, skey, name, key) \ | |
1014 | do { \ | |
e8f6fbf6 | 1015 | sk->sk_lock.owned = 0; \ |
ed07536e PZ |
1016 | init_waitqueue_head(&sk->sk_lock.wq); \ |
1017 | spin_lock_init(&(sk)->sk_lock.slock); \ | |
1018 | debug_check_no_locks_freed((void *)&(sk)->sk_lock, \ | |
1019 | sizeof((sk)->sk_lock)); \ | |
1020 | lockdep_set_class_and_name(&(sk)->sk_lock.slock, \ | |
1021 | (skey), (sname)); \ | |
1022 | lockdep_init_map(&(sk)->sk_lock.dep_map, (name), (key), 0); \ | |
1023 | } while (0) | |
1024 | ||
41380930 | 1025 | extern void lock_sock_nested(struct sock *sk, int subclass); |
fcc70d5f PZ |
1026 | |
1027 | static inline void lock_sock(struct sock *sk) | |
1028 | { | |
1029 | lock_sock_nested(sk, 0); | |
1030 | } | |
1031 | ||
41380930 | 1032 | extern void release_sock(struct sock *sk); |
1da177e4 LT |
1033 | |
1034 | /* BH context may only use the following locking interface. */ | |
1035 | #define bh_lock_sock(__sk) spin_lock(&((__sk)->sk_lock.slock)) | |
c6366184 IM |
1036 | #define bh_lock_sock_nested(__sk) \ |
1037 | spin_lock_nested(&((__sk)->sk_lock.slock), \ | |
1038 | SINGLE_DEPTH_NESTING) | |
1da177e4 LT |
1039 | #define bh_unlock_sock(__sk) spin_unlock(&((__sk)->sk_lock.slock)) |
1040 | ||
8a74ad60 ED |
1041 | extern bool lock_sock_fast(struct sock *sk); |
1042 | /** | |
1043 | * unlock_sock_fast - complement of lock_sock_fast | |
1044 | * @sk: socket | |
1045 | * @slow: slow mode | |
1046 | * | |
1047 | * fast unlock socket for user context. | |
1048 | * If slow mode is on, we call regular release_sock() | |
1049 | */ | |
1050 | static inline void unlock_sock_fast(struct sock *sk, bool slow) | |
4b0b72f7 | 1051 | { |
8a74ad60 ED |
1052 | if (slow) |
1053 | release_sock(sk); | |
1054 | else | |
1055 | spin_unlock_bh(&sk->sk_lock.slock); | |
4b0b72f7 ED |
1056 | } |
1057 | ||
4b0b72f7 | 1058 | |
1b8d7ae4 | 1059 | extern struct sock *sk_alloc(struct net *net, int family, |
dd0fc66f | 1060 | gfp_t priority, |
6257ff21 | 1061 | struct proto *prot); |
1da177e4 | 1062 | extern void sk_free(struct sock *sk); |
edf02087 | 1063 | extern void sk_release_kernel(struct sock *sk); |
87d11ceb | 1064 | extern struct sock *sk_clone(const struct sock *sk, |
dd0fc66f | 1065 | const gfp_t priority); |
1da177e4 LT |
1066 | |
1067 | extern struct sk_buff *sock_wmalloc(struct sock *sk, | |
1068 | unsigned long size, int force, | |
dd0fc66f | 1069 | gfp_t priority); |
1da177e4 LT |
1070 | extern struct sk_buff *sock_rmalloc(struct sock *sk, |
1071 | unsigned long size, int force, | |
dd0fc66f | 1072 | gfp_t priority); |
1da177e4 LT |
1073 | extern void sock_wfree(struct sk_buff *skb); |
1074 | extern void sock_rfree(struct sk_buff *skb); | |
1075 | ||
1076 | extern int sock_setsockopt(struct socket *sock, int level, | |
1077 | int op, char __user *optval, | |
b7058842 | 1078 | unsigned int optlen); |
1da177e4 LT |
1079 | |
1080 | extern int sock_getsockopt(struct socket *sock, int level, | |
1081 | int op, char __user *optval, | |
1082 | int __user *optlen); | |
1083 | extern struct sk_buff *sock_alloc_send_skb(struct sock *sk, | |
1084 | unsigned long size, | |
1085 | int noblock, | |
1086 | int *errcode); | |
4cc7f68d HX |
1087 | extern struct sk_buff *sock_alloc_send_pskb(struct sock *sk, |
1088 | unsigned long header_len, | |
1089 | unsigned long data_len, | |
1090 | int noblock, | |
1091 | int *errcode); | |
86a76caf | 1092 | extern void *sock_kmalloc(struct sock *sk, int size, |
dd0fc66f | 1093 | gfp_t priority); |
1da177e4 LT |
1094 | extern void sock_kfree_s(struct sock *sk, void *mem, int size); |
1095 | extern void sk_send_sigurg(struct sock *sk); | |
1096 | ||
f8451725 HX |
1097 | #ifdef CONFIG_CGROUPS |
1098 | extern void sock_update_classid(struct sock *sk); | |
1099 | #else | |
1100 | static inline void sock_update_classid(struct sock *sk) | |
1101 | { | |
1102 | } | |
1103 | #endif | |
1104 | ||
1da177e4 LT |
1105 | /* |
1106 | * Functions to fill in entries in struct proto_ops when a protocol | |
1107 | * does not implement a particular function. | |
1108 | */ | |
1109 | extern int sock_no_bind(struct socket *, | |
1110 | struct sockaddr *, int); | |
1111 | extern int sock_no_connect(struct socket *, | |
1112 | struct sockaddr *, int, int); | |
1113 | extern int sock_no_socketpair(struct socket *, | |
1114 | struct socket *); | |
1115 | extern int sock_no_accept(struct socket *, | |
1116 | struct socket *, int); | |
1117 | extern int sock_no_getname(struct socket *, | |
1118 | struct sockaddr *, int *, int); | |
1119 | extern unsigned int sock_no_poll(struct file *, struct socket *, | |
1120 | struct poll_table_struct *); | |
1121 | extern int sock_no_ioctl(struct socket *, unsigned int, | |
1122 | unsigned long); | |
1123 | extern int sock_no_listen(struct socket *, int); | |
1124 | extern int sock_no_shutdown(struct socket *, int); | |
1125 | extern int sock_no_getsockopt(struct socket *, int , int, | |
1126 | char __user *, int __user *); | |
1127 | extern int sock_no_setsockopt(struct socket *, int, int, | |
b7058842 | 1128 | char __user *, unsigned int); |
1da177e4 LT |
1129 | extern int sock_no_sendmsg(struct kiocb *, struct socket *, |
1130 | struct msghdr *, size_t); | |
1131 | extern int sock_no_recvmsg(struct kiocb *, struct socket *, | |
1132 | struct msghdr *, size_t, int); | |
1133 | extern int sock_no_mmap(struct file *file, | |
1134 | struct socket *sock, | |
1135 | struct vm_area_struct *vma); | |
1136 | extern ssize_t sock_no_sendpage(struct socket *sock, | |
1137 | struct page *page, | |
1138 | int offset, size_t size, | |
1139 | int flags); | |
1140 | ||
1141 | /* | |
1142 | * Functions to fill in entries in struct proto_ops when a protocol | |
1143 | * uses the inet style. | |
1144 | */ | |
1145 | extern int sock_common_getsockopt(struct socket *sock, int level, int optname, | |
1146 | char __user *optval, int __user *optlen); | |
1147 | extern int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock, | |
1148 | struct msghdr *msg, size_t size, int flags); | |
1149 | extern int sock_common_setsockopt(struct socket *sock, int level, int optname, | |
b7058842 | 1150 | char __user *optval, unsigned int optlen); |
3fdadf7d DM |
1151 | extern int compat_sock_common_getsockopt(struct socket *sock, int level, |
1152 | int optname, char __user *optval, int __user *optlen); | |
1153 | extern int compat_sock_common_setsockopt(struct socket *sock, int level, | |
b7058842 | 1154 | int optname, char __user *optval, unsigned int optlen); |
1da177e4 LT |
1155 | |
1156 | extern void sk_common_release(struct sock *sk); | |
1157 | ||
1158 | /* | |
1159 | * Default socket callbacks and setup code | |
1160 | */ | |
1161 | ||
1162 | /* Initialise core socket variables */ | |
1163 | extern void sock_init_data(struct socket *sock, struct sock *sk); | |
1164 | ||
dc9b3346 | 1165 | /** |
1a5778aa | 1166 | * sk_filter_release - release a socket filter |
dc9b3346 PB |
1167 | * @fp: filter to remove |
1168 | * | |
1169 | * Remove a filter from a socket and release its resources. | |
1170 | */ | |
1171 | ||
309dd5fc PE |
1172 | static inline void sk_filter_release(struct sk_filter *fp) |
1173 | { | |
1174 | if (atomic_dec_and_test(&fp->refcnt)) | |
47e958ea | 1175 | kfree(fp); |
309dd5fc PE |
1176 | } |
1177 | ||
1178 | static inline void sk_filter_uncharge(struct sock *sk, struct sk_filter *fp) | |
1da177e4 LT |
1179 | { |
1180 | unsigned int size = sk_filter_len(fp); | |
1181 | ||
1182 | atomic_sub(size, &sk->sk_omem_alloc); | |
309dd5fc | 1183 | sk_filter_release(fp); |
1da177e4 LT |
1184 | } |
1185 | ||
1186 | static inline void sk_filter_charge(struct sock *sk, struct sk_filter *fp) | |
1187 | { | |
1188 | atomic_inc(&fp->refcnt); | |
1189 | atomic_add(sk_filter_len(fp), &sk->sk_omem_alloc); | |
1190 | } | |
1191 | ||
1192 | /* | |
1193 | * Socket reference counting postulates. | |
1194 | * | |
1195 | * * Each user of socket SHOULD hold a reference count. | |
1196 | * * Each access point to socket (an hash table bucket, reference from a list, | |
1197 | * running timer, skb in flight MUST hold a reference count. | |
1198 | * * When reference count hits 0, it means it will never increase back. | |
1199 | * * When reference count hits 0, it means that no references from | |
1200 | * outside exist to this socket and current process on current CPU | |
1201 | * is last user and may/should destroy this socket. | |
1202 | * * sk_free is called from any context: process, BH, IRQ. When | |
1203 | * it is called, socket has no references from outside -> sk_free | |
1204 | * may release descendant resources allocated by the socket, but | |
1205 | * to the time when it is called, socket is NOT referenced by any | |
1206 | * hash tables, lists etc. | |
1207 | * * Packets, delivered from outside (from network or from another process) | |
1208 | * and enqueued on receive/error queues SHOULD NOT grab reference count, | |
1209 | * when they sit in queue. Otherwise, packets will leak to hole, when | |
1210 | * socket is looked up by one cpu and unhasing is made by another CPU. | |
1211 | * It is true for udp/raw, netlink (leak to receive and error queues), tcp | |
1212 | * (leak to backlog). Packet socket does all the processing inside | |
1213 | * BR_NETPROTO_LOCK, so that it has not this race condition. UNIX sockets | |
1214 | * use separate SMP lock, so that they are prone too. | |
1215 | */ | |
1216 | ||
1217 | /* Ungrab socket and destroy it, if it was the last reference. */ | |
1218 | static inline void sock_put(struct sock *sk) | |
1219 | { | |
1220 | if (atomic_dec_and_test(&sk->sk_refcnt)) | |
1221 | sk_free(sk); | |
1222 | } | |
1223 | ||
58a5a7b9 ACM |
1224 | extern int sk_receive_skb(struct sock *sk, struct sk_buff *skb, |
1225 | const int nested); | |
25995ff5 | 1226 | |
e022f0b4 KK |
1227 | static inline void sk_tx_queue_set(struct sock *sk, int tx_queue) |
1228 | { | |
1229 | sk->sk_tx_queue_mapping = tx_queue; | |
1230 | } | |
1231 | ||
1232 | static inline void sk_tx_queue_clear(struct sock *sk) | |
1233 | { | |
1234 | sk->sk_tx_queue_mapping = -1; | |
1235 | } | |
1236 | ||
1237 | static inline int sk_tx_queue_get(const struct sock *sk) | |
1238 | { | |
b0f77d0e | 1239 | return sk ? sk->sk_tx_queue_mapping : -1; |
e022f0b4 KK |
1240 | } |
1241 | ||
972692e0 DM |
1242 | static inline void sk_set_socket(struct sock *sk, struct socket *sock) |
1243 | { | |
e022f0b4 | 1244 | sk_tx_queue_clear(sk); |
972692e0 DM |
1245 | sk->sk_socket = sock; |
1246 | } | |
1247 | ||
aa395145 ED |
1248 | static inline wait_queue_head_t *sk_sleep(struct sock *sk) |
1249 | { | |
43815482 | 1250 | return &sk->sk_wq->wait; |
aa395145 | 1251 | } |
1da177e4 LT |
1252 | /* Detach socket from process context. |
1253 | * Announce socket dead, detach it from wait queue and inode. | |
1254 | * Note that parent inode held reference count on this struct sock, | |
1255 | * we do not release it in this function, because protocol | |
1256 | * probably wants some additional cleanups or even continuing | |
1257 | * to work with this socket (TCP). | |
1258 | */ | |
1259 | static inline void sock_orphan(struct sock *sk) | |
1260 | { | |
1261 | write_lock_bh(&sk->sk_callback_lock); | |
1262 | sock_set_flag(sk, SOCK_DEAD); | |
972692e0 | 1263 | sk_set_socket(sk, NULL); |
43815482 | 1264 | sk->sk_wq = NULL; |
1da177e4 LT |
1265 | write_unlock_bh(&sk->sk_callback_lock); |
1266 | } | |
1267 | ||
1268 | static inline void sock_graft(struct sock *sk, struct socket *parent) | |
1269 | { | |
1270 | write_lock_bh(&sk->sk_callback_lock); | |
43815482 | 1271 | rcu_assign_pointer(sk->sk_wq, parent->wq); |
1da177e4 | 1272 | parent->sk = sk; |
972692e0 | 1273 | sk_set_socket(sk, parent); |
4237c75c | 1274 | security_sock_graft(sk, parent); |
1da177e4 LT |
1275 | write_unlock_bh(&sk->sk_callback_lock); |
1276 | } | |
1277 | ||
1278 | extern int sock_i_uid(struct sock *sk); | |
1279 | extern unsigned long sock_i_ino(struct sock *sk); | |
1280 | ||
1281 | static inline struct dst_entry * | |
1282 | __sk_dst_get(struct sock *sk) | |
1283 | { | |
b6c6712a | 1284 | return rcu_dereference_check(sk->sk_dst_cache, rcu_read_lock_held() || |
f68c224f ED |
1285 | sock_owned_by_user(sk) || |
1286 | lockdep_is_held(&sk->sk_lock.slock)); | |
1da177e4 LT |
1287 | } |
1288 | ||
1289 | static inline struct dst_entry * | |
1290 | sk_dst_get(struct sock *sk) | |
1291 | { | |
1292 | struct dst_entry *dst; | |
1293 | ||
b6c6712a ED |
1294 | rcu_read_lock(); |
1295 | dst = rcu_dereference(sk->sk_dst_cache); | |
1da177e4 LT |
1296 | if (dst) |
1297 | dst_hold(dst); | |
b6c6712a | 1298 | rcu_read_unlock(); |
1da177e4 LT |
1299 | return dst; |
1300 | } | |
1301 | ||
b6c6712a ED |
1302 | extern void sk_reset_txq(struct sock *sk); |
1303 | ||
1304 | static inline void dst_negative_advice(struct sock *sk) | |
1305 | { | |
1306 | struct dst_entry *ndst, *dst = __sk_dst_get(sk); | |
1307 | ||
1308 | if (dst && dst->ops->negative_advice) { | |
1309 | ndst = dst->ops->negative_advice(dst); | |
1310 | ||
1311 | if (ndst != dst) { | |
1312 | rcu_assign_pointer(sk->sk_dst_cache, ndst); | |
1313 | sk_reset_txq(sk); | |
1314 | } | |
1315 | } | |
1316 | } | |
1317 | ||
1da177e4 LT |
1318 | static inline void |
1319 | __sk_dst_set(struct sock *sk, struct dst_entry *dst) | |
1320 | { | |
1321 | struct dst_entry *old_dst; | |
1322 | ||
e022f0b4 | 1323 | sk_tx_queue_clear(sk); |
0b53ff2e ED |
1324 | /* |
1325 | * This can be called while sk is owned by the caller only, | |
1326 | * with no state that can be checked in a rcu_dereference_check() cond | |
1327 | */ | |
1328 | old_dst = rcu_dereference_raw(sk->sk_dst_cache); | |
b6c6712a | 1329 | rcu_assign_pointer(sk->sk_dst_cache, dst); |
1da177e4 LT |
1330 | dst_release(old_dst); |
1331 | } | |
1332 | ||
1333 | static inline void | |
1334 | sk_dst_set(struct sock *sk, struct dst_entry *dst) | |
1335 | { | |
b6c6712a | 1336 | spin_lock(&sk->sk_dst_lock); |
1da177e4 | 1337 | __sk_dst_set(sk, dst); |
b6c6712a | 1338 | spin_unlock(&sk->sk_dst_lock); |
1da177e4 LT |
1339 | } |
1340 | ||
1341 | static inline void | |
1342 | __sk_dst_reset(struct sock *sk) | |
1343 | { | |
b6c6712a | 1344 | __sk_dst_set(sk, NULL); |
1da177e4 LT |
1345 | } |
1346 | ||
1347 | static inline void | |
1348 | sk_dst_reset(struct sock *sk) | |
1349 | { | |
b6c6712a | 1350 | spin_lock(&sk->sk_dst_lock); |
1da177e4 | 1351 | __sk_dst_reset(sk); |
b6c6712a | 1352 | spin_unlock(&sk->sk_dst_lock); |
1da177e4 LT |
1353 | } |
1354 | ||
f0088a50 | 1355 | extern struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie); |
1da177e4 | 1356 | |
f0088a50 | 1357 | extern struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie); |
1da177e4 | 1358 | |
bcd76111 HX |
1359 | static inline int sk_can_gso(const struct sock *sk) |
1360 | { | |
1361 | return net_gso_ok(sk->sk_route_caps, sk->sk_gso_type); | |
1362 | } | |
1363 | ||
9958089a | 1364 | extern void sk_setup_caps(struct sock *sk, struct dst_entry *dst); |
6cbb0df7 | 1365 | |
a465419b ED |
1366 | static inline void sk_nocaps_add(struct sock *sk, int flags) |
1367 | { | |
1368 | sk->sk_route_nocaps |= flags; | |
1369 | sk->sk_route_caps &= ~flags; | |
1370 | } | |
1371 | ||
1da177e4 LT |
1372 | static inline int skb_copy_to_page(struct sock *sk, char __user *from, |
1373 | struct sk_buff *skb, struct page *page, | |
1374 | int off, int copy) | |
1375 | { | |
1376 | if (skb->ip_summed == CHECKSUM_NONE) { | |
1377 | int err = 0; | |
5084205f | 1378 | __wsum csum = csum_and_copy_from_user(from, |
1da177e4 LT |
1379 | page_address(page) + off, |
1380 | copy, 0, &err); | |
1381 | if (err) | |
1382 | return err; | |
1383 | skb->csum = csum_block_add(skb->csum, csum, skb->len); | |
1384 | } else if (copy_from_user(page_address(page) + off, from, copy)) | |
1385 | return -EFAULT; | |
1386 | ||
1387 | skb->len += copy; | |
1388 | skb->data_len += copy; | |
1389 | skb->truesize += copy; | |
1390 | sk->sk_wmem_queued += copy; | |
3ab224be | 1391 | sk_mem_charge(sk, copy); |
1da177e4 LT |
1392 | return 0; |
1393 | } | |
1394 | ||
c564039f ED |
1395 | /** |
1396 | * sk_wmem_alloc_get - returns write allocations | |
1397 | * @sk: socket | |
1398 | * | |
1399 | * Returns sk_wmem_alloc minus initial offset of one | |
1400 | */ | |
1401 | static inline int sk_wmem_alloc_get(const struct sock *sk) | |
1402 | { | |
1403 | return atomic_read(&sk->sk_wmem_alloc) - 1; | |
1404 | } | |
1405 | ||
1406 | /** | |
1407 | * sk_rmem_alloc_get - returns read allocations | |
1408 | * @sk: socket | |
1409 | * | |
1410 | * Returns sk_rmem_alloc | |
1411 | */ | |
1412 | static inline int sk_rmem_alloc_get(const struct sock *sk) | |
1413 | { | |
1414 | return atomic_read(&sk->sk_rmem_alloc); | |
1415 | } | |
1416 | ||
1417 | /** | |
1418 | * sk_has_allocations - check if allocations are outstanding | |
1419 | * @sk: socket | |
1420 | * | |
1421 | * Returns true if socket has write or read allocations | |
1422 | */ | |
1423 | static inline int sk_has_allocations(const struct sock *sk) | |
1424 | { | |
1425 | return sk_wmem_alloc_get(sk) || sk_rmem_alloc_get(sk); | |
1426 | } | |
1427 | ||
a57de0b4 | 1428 | /** |
43815482 | 1429 | * wq_has_sleeper - check if there are any waiting processes |
acfbe96a | 1430 | * @wq: struct socket_wq |
a57de0b4 | 1431 | * |
43815482 | 1432 | * Returns true if socket_wq has waiting processes |
a57de0b4 | 1433 | * |
43815482 | 1434 | * The purpose of the wq_has_sleeper and sock_poll_wait is to wrap the memory |
a57de0b4 JO |
1435 | * barrier call. They were added due to the race found within the tcp code. |
1436 | * | |
1437 | * Consider following tcp code paths: | |
1438 | * | |
1439 | * CPU1 CPU2 | |
1440 | * | |
1441 | * sys_select receive packet | |
1442 | * ... ... | |
1443 | * __add_wait_queue update tp->rcv_nxt | |
1444 | * ... ... | |
1445 | * tp->rcv_nxt check sock_def_readable | |
1446 | * ... { | |
43815482 ED |
1447 | * schedule rcu_read_lock(); |
1448 | * wq = rcu_dereference(sk->sk_wq); | |
1449 | * if (wq && waitqueue_active(&wq->wait)) | |
1450 | * wake_up_interruptible(&wq->wait) | |
a57de0b4 JO |
1451 | * ... |
1452 | * } | |
1453 | * | |
1454 | * The race for tcp fires when the __add_wait_queue changes done by CPU1 stay | |
1455 | * in its cache, and so does the tp->rcv_nxt update on CPU2 side. The CPU1 | |
1456 | * could then endup calling schedule and sleep forever if there are no more | |
1457 | * data on the socket. | |
ad462769 | 1458 | * |
a57de0b4 | 1459 | */ |
43815482 | 1460 | static inline bool wq_has_sleeper(struct socket_wq *wq) |
a57de0b4 | 1461 | { |
43815482 | 1462 | |
a57de0b4 JO |
1463 | /* |
1464 | * We need to be sure we are in sync with the | |
1465 | * add_wait_queue modifications to the wait queue. | |
1466 | * | |
1467 | * This memory barrier is paired in the sock_poll_wait. | |
1468 | */ | |
43815482 ED |
1469 | smp_mb(); |
1470 | return wq && waitqueue_active(&wq->wait); | |
a57de0b4 JO |
1471 | } |
1472 | ||
1473 | /** | |
1474 | * sock_poll_wait - place memory barrier behind the poll_wait call. | |
1475 | * @filp: file | |
1476 | * @wait_address: socket wait queue | |
1477 | * @p: poll_table | |
1478 | * | |
43815482 | 1479 | * See the comments in the wq_has_sleeper function. |
a57de0b4 JO |
1480 | */ |
1481 | static inline void sock_poll_wait(struct file *filp, | |
1482 | wait_queue_head_t *wait_address, poll_table *p) | |
1483 | { | |
1484 | if (p && wait_address) { | |
1485 | poll_wait(filp, wait_address, p); | |
1486 | /* | |
1487 | * We need to be sure we are in sync with the | |
1488 | * socket flags modification. | |
1489 | * | |
43815482 | 1490 | * This memory barrier is paired in the wq_has_sleeper. |
a57de0b4 JO |
1491 | */ |
1492 | smp_mb(); | |
1493 | } | |
1494 | } | |
1495 | ||
1da177e4 LT |
1496 | /* |
1497 | * Queue a received datagram if it will fit. Stream and sequenced | |
1498 | * protocols can't normally use this as they need to fit buffers in | |
1499 | * and play with them. | |
1500 | * | |
1501 | * Inlined as it's very short and called for pretty much every | |
1502 | * packet ever received. | |
1503 | */ | |
1504 | ||
1505 | static inline void skb_set_owner_w(struct sk_buff *skb, struct sock *sk) | |
1506 | { | |
d55d87fd | 1507 | skb_orphan(skb); |
1da177e4 LT |
1508 | skb->sk = sk; |
1509 | skb->destructor = sock_wfree; | |
2b85a34e ED |
1510 | /* |
1511 | * We used to take a refcount on sk, but following operation | |
1512 | * is enough to guarantee sk_free() wont free this sock until | |
1513 | * all in-flight packets are completed | |
1514 | */ | |
1da177e4 LT |
1515 | atomic_add(skb->truesize, &sk->sk_wmem_alloc); |
1516 | } | |
1517 | ||
1518 | static inline void skb_set_owner_r(struct sk_buff *skb, struct sock *sk) | |
1519 | { | |
d55d87fd | 1520 | skb_orphan(skb); |
1da177e4 LT |
1521 | skb->sk = sk; |
1522 | skb->destructor = sock_rfree; | |
1523 | atomic_add(skb->truesize, &sk->sk_rmem_alloc); | |
3ab224be | 1524 | sk_mem_charge(sk, skb->truesize); |
1da177e4 LT |
1525 | } |
1526 | ||
1527 | extern void sk_reset_timer(struct sock *sk, struct timer_list* timer, | |
1528 | unsigned long expires); | |
1529 | ||
1530 | extern void sk_stop_timer(struct sock *sk, struct timer_list* timer); | |
1531 | ||
f0088a50 | 1532 | extern int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb); |
1da177e4 | 1533 | |
b1faf566 | 1534 | extern int sock_queue_err_skb(struct sock *sk, struct sk_buff *skb); |
1da177e4 LT |
1535 | |
1536 | /* | |
1537 | * Recover an error report and clear atomically | |
1538 | */ | |
1539 | ||
1540 | static inline int sock_error(struct sock *sk) | |
1541 | { | |
c1cbe4b7 BL |
1542 | int err; |
1543 | if (likely(!sk->sk_err)) | |
1544 | return 0; | |
1545 | err = xchg(&sk->sk_err, 0); | |
1da177e4 LT |
1546 | return -err; |
1547 | } | |
1548 | ||
1549 | static inline unsigned long sock_wspace(struct sock *sk) | |
1550 | { | |
1551 | int amt = 0; | |
1552 | ||
1553 | if (!(sk->sk_shutdown & SEND_SHUTDOWN)) { | |
1554 | amt = sk->sk_sndbuf - atomic_read(&sk->sk_wmem_alloc); | |
1555 | if (amt < 0) | |
1556 | amt = 0; | |
1557 | } | |
1558 | return amt; | |
1559 | } | |
1560 | ||
1561 | static inline void sk_wake_async(struct sock *sk, int how, int band) | |
1562 | { | |
bcdce719 | 1563 | if (sock_flag(sk, SOCK_FASYNC)) |
1da177e4 LT |
1564 | sock_wake_async(sk->sk_socket, how, band); |
1565 | } | |
1566 | ||
1567 | #define SOCK_MIN_SNDBUF 2048 | |
7a91b434 ED |
1568 | /* |
1569 | * Since sk_rmem_alloc sums skb->truesize, even a small frame might need | |
1570 | * sizeof(sk_buff) + MTU + padding, unless net driver perform copybreak | |
1571 | */ | |
1572 | #define SOCK_MIN_RCVBUF (2048 + sizeof(struct sk_buff)) | |
1da177e4 LT |
1573 | |
1574 | static inline void sk_stream_moderate_sndbuf(struct sock *sk) | |
1575 | { | |
1576 | if (!(sk->sk_userlocks & SOCK_SNDBUF_LOCK)) { | |
8df09ea3 | 1577 | sk->sk_sndbuf = min(sk->sk_sndbuf, sk->sk_wmem_queued >> 1); |
1da177e4 LT |
1578 | sk->sk_sndbuf = max(sk->sk_sndbuf, SOCK_MIN_SNDBUF); |
1579 | } | |
1580 | } | |
1581 | ||
df97c708 | 1582 | struct sk_buff *sk_stream_alloc_skb(struct sock *sk, int size, gfp_t gfp); |
1da177e4 LT |
1583 | |
1584 | static inline struct page *sk_stream_alloc_page(struct sock *sk) | |
1585 | { | |
1586 | struct page *page = NULL; | |
1587 | ||
ef015786 HX |
1588 | page = alloc_pages(sk->sk_allocation, 0); |
1589 | if (!page) { | |
5c52ba17 | 1590 | sk->sk_prot->enter_memory_pressure(sk); |
1da177e4 LT |
1591 | sk_stream_moderate_sndbuf(sk); |
1592 | } | |
1593 | return page; | |
1594 | } | |
1595 | ||
1da177e4 LT |
1596 | /* |
1597 | * Default write policy as shown to user space via poll/select/SIGIO | |
1598 | */ | |
1599 | static inline int sock_writeable(const struct sock *sk) | |
1600 | { | |
8df09ea3 | 1601 | return atomic_read(&sk->sk_wmem_alloc) < (sk->sk_sndbuf >> 1); |
1da177e4 LT |
1602 | } |
1603 | ||
dd0fc66f | 1604 | static inline gfp_t gfp_any(void) |
1da177e4 | 1605 | { |
99709372 | 1606 | return in_softirq() ? GFP_ATOMIC : GFP_KERNEL; |
1da177e4 LT |
1607 | } |
1608 | ||
1609 | static inline long sock_rcvtimeo(const struct sock *sk, int noblock) | |
1610 | { | |
1611 | return noblock ? 0 : sk->sk_rcvtimeo; | |
1612 | } | |
1613 | ||
1614 | static inline long sock_sndtimeo(const struct sock *sk, int noblock) | |
1615 | { | |
1616 | return noblock ? 0 : sk->sk_sndtimeo; | |
1617 | } | |
1618 | ||
1619 | static inline int sock_rcvlowat(const struct sock *sk, int waitall, int len) | |
1620 | { | |
1621 | return (waitall ? len : min_t(int, sk->sk_rcvlowat, len)) ? : 1; | |
1622 | } | |
1623 | ||
1624 | /* Alas, with timeout socket operations are not restartable. | |
1625 | * Compare this to poll(). | |
1626 | */ | |
1627 | static inline int sock_intr_errno(long timeo) | |
1628 | { | |
1629 | return timeo == MAX_SCHEDULE_TIMEOUT ? -ERESTARTSYS : -EINTR; | |
1630 | } | |
1631 | ||
92f37fd2 ED |
1632 | extern void __sock_recv_timestamp(struct msghdr *msg, struct sock *sk, |
1633 | struct sk_buff *skb); | |
1634 | ||
1da177e4 LT |
1635 | static __inline__ void |
1636 | sock_recv_timestamp(struct msghdr *msg, struct sock *sk, struct sk_buff *skb) | |
1637 | { | |
b7aa0bf7 | 1638 | ktime_t kt = skb->tstamp; |
20d49473 | 1639 | struct skb_shared_hwtstamps *hwtstamps = skb_hwtstamps(skb); |
a61bbcf2 | 1640 | |
20d49473 PO |
1641 | /* |
1642 | * generate control messages if | |
1643 | * - receive time stamping in software requested (SOCK_RCVTSTAMP | |
1644 | * or SOCK_TIMESTAMPING_RX_SOFTWARE) | |
1645 | * - software time stamp available and wanted | |
1646 | * (SOCK_TIMESTAMPING_SOFTWARE) | |
1647 | * - hardware time stamps available and wanted | |
1648 | * (SOCK_TIMESTAMPING_SYS_HARDWARE or | |
1649 | * SOCK_TIMESTAMPING_RAW_HARDWARE) | |
1650 | */ | |
1651 | if (sock_flag(sk, SOCK_RCVTSTAMP) || | |
1652 | sock_flag(sk, SOCK_TIMESTAMPING_RX_SOFTWARE) || | |
1653 | (kt.tv64 && sock_flag(sk, SOCK_TIMESTAMPING_SOFTWARE)) || | |
1654 | (hwtstamps->hwtstamp.tv64 && | |
1655 | sock_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE)) || | |
1656 | (hwtstamps->syststamp.tv64 && | |
1657 | sock_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE))) | |
92f37fd2 ED |
1658 | __sock_recv_timestamp(msg, sk, skb); |
1659 | else | |
b7aa0bf7 | 1660 | sk->sk_stamp = kt; |
1da177e4 LT |
1661 | } |
1662 | ||
767dd033 ED |
1663 | extern void __sock_recv_ts_and_drops(struct msghdr *msg, struct sock *sk, |
1664 | struct sk_buff *skb); | |
1665 | ||
1666 | static inline void sock_recv_ts_and_drops(struct msghdr *msg, struct sock *sk, | |
1667 | struct sk_buff *skb) | |
1668 | { | |
1669 | #define FLAGS_TS_OR_DROPS ((1UL << SOCK_RXQ_OVFL) | \ | |
1670 | (1UL << SOCK_RCVTSTAMP) | \ | |
1671 | (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE) | \ | |
1672 | (1UL << SOCK_TIMESTAMPING_SOFTWARE) | \ | |
1673 | (1UL << SOCK_TIMESTAMPING_RAW_HARDWARE) | \ | |
1674 | (1UL << SOCK_TIMESTAMPING_SYS_HARDWARE)) | |
1675 | ||
1676 | if (sk->sk_flags & FLAGS_TS_OR_DROPS) | |
1677 | __sock_recv_ts_and_drops(msg, sk, skb); | |
1678 | else | |
1679 | sk->sk_stamp = skb->tstamp; | |
1680 | } | |
3b885787 | 1681 | |
20d49473 PO |
1682 | /** |
1683 | * sock_tx_timestamp - checks whether the outgoing packet is to be time stamped | |
20d49473 | 1684 | * @sk: socket sending this packet |
2244d07b | 1685 | * @tx_flags: filled with instructions for time stamping |
20d49473 PO |
1686 | * |
1687 | * Currently only depends on SOCK_TIMESTAMPING* flags. Returns error code if | |
1688 | * parameters are invalid. | |
1689 | */ | |
2244d07b | 1690 | extern int sock_tx_timestamp(struct sock *sk, __u8 *tx_flags); |
20d49473 | 1691 | |
1da177e4 LT |
1692 | /** |
1693 | * sk_eat_skb - Release a skb if it is no longer needed | |
4dc3b16b PP |
1694 | * @sk: socket to eat this skb from |
1695 | * @skb: socket buffer to eat | |
f4b8ea78 | 1696 | * @copied_early: flag indicating whether DMA operations copied this data early |
1da177e4 LT |
1697 | * |
1698 | * This routine must be called with interrupts disabled or with the socket | |
1699 | * locked so that the sk_buff queue operation is ok. | |
1700 | */ | |
624d1164 CL |
1701 | #ifdef CONFIG_NET_DMA |
1702 | static inline void sk_eat_skb(struct sock *sk, struct sk_buff *skb, int copied_early) | |
1703 | { | |
1704 | __skb_unlink(skb, &sk->sk_receive_queue); | |
1705 | if (!copied_early) | |
1706 | __kfree_skb(skb); | |
1707 | else | |
1708 | __skb_queue_tail(&sk->sk_async_wait_queue, skb); | |
1709 | } | |
1710 | #else | |
1711 | static inline void sk_eat_skb(struct sock *sk, struct sk_buff *skb, int copied_early) | |
1da177e4 LT |
1712 | { |
1713 | __skb_unlink(skb, &sk->sk_receive_queue); | |
1714 | __kfree_skb(skb); | |
1715 | } | |
624d1164 | 1716 | #endif |
1da177e4 | 1717 | |
3b1e0a65 YH |
1718 | static inline |
1719 | struct net *sock_net(const struct sock *sk) | |
1720 | { | |
c2d9ba9b | 1721 | return read_pnet(&sk->sk_net); |
3b1e0a65 YH |
1722 | } |
1723 | ||
1724 | static inline | |
f5aa23fd | 1725 | void sock_net_set(struct sock *sk, struct net *net) |
3b1e0a65 | 1726 | { |
c2d9ba9b | 1727 | write_pnet(&sk->sk_net, net); |
3b1e0a65 YH |
1728 | } |
1729 | ||
edf02087 DL |
1730 | /* |
1731 | * Kernel sockets, f.e. rtnl or icmp_socket, are a part of a namespace. | |
1732 | * They should not hold a referrence to a namespace in order to allow | |
1733 | * to stop it. | |
1734 | * Sockets after sk_change_net should be released using sk_release_kernel | |
1735 | */ | |
1736 | static inline void sk_change_net(struct sock *sk, struct net *net) | |
1737 | { | |
3b1e0a65 | 1738 | put_net(sock_net(sk)); |
65a18ec5 | 1739 | sock_net_set(sk, hold_net(net)); |
edf02087 DL |
1740 | } |
1741 | ||
23542618 KK |
1742 | static inline struct sock *skb_steal_sock(struct sk_buff *skb) |
1743 | { | |
1744 | if (unlikely(skb->sk)) { | |
1745 | struct sock *sk = skb->sk; | |
1746 | ||
1747 | skb->destructor = NULL; | |
1748 | skb->sk = NULL; | |
1749 | return sk; | |
1750 | } | |
1751 | return NULL; | |
1752 | } | |
1753 | ||
20d49473 | 1754 | extern void sock_enable_timestamp(struct sock *sk, int flag); |
1da177e4 | 1755 | extern int sock_get_timestamp(struct sock *, struct timeval __user *); |
ae40eb1e | 1756 | extern int sock_get_timestampns(struct sock *, struct timespec __user *); |
1da177e4 LT |
1757 | |
1758 | /* | |
1759 | * Enable debug/info messages | |
1760 | */ | |
a2a316fd SH |
1761 | extern int net_msg_warn; |
1762 | #define NETDEBUG(fmt, args...) \ | |
1763 | do { if (net_msg_warn) printk(fmt,##args); } while (0) | |
1da177e4 | 1764 | |
a2a316fd SH |
1765 | #define LIMIT_NETDEBUG(fmt, args...) \ |
1766 | do { if (net_msg_warn && net_ratelimit()) printk(fmt,##args); } while(0) | |
1da177e4 | 1767 | |
1da177e4 LT |
1768 | extern __u32 sysctl_wmem_max; |
1769 | extern __u32 sysctl_rmem_max; | |
1770 | ||
20380731 ACM |
1771 | extern void sk_init(void); |
1772 | ||
6baf1f41 DM |
1773 | extern int sysctl_optmem_max; |
1774 | ||
20380731 ACM |
1775 | extern __u32 sysctl_wmem_default; |
1776 | extern __u32 sysctl_rmem_default; | |
20380731 | 1777 | |
1da177e4 | 1778 | #endif /* _SOCK_H */ |