Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * INET An implementation of the TCP/IP protocol suite for the LINUX | |
3 | * operating system. INET is implemented using the BSD Socket | |
4 | * interface as the means of communication with the user level. | |
5 | * | |
6 | * Definitions for the AF_INET socket handler. | |
7 | * | |
8 | * Version: @(#)sock.h 1.0.4 05/13/93 | |
9 | * | |
02c30a84 | 10 | * Authors: Ross Biro |
1da177e4 LT |
11 | * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> |
12 | * Corey Minyard <wf-rch!minyard@relay.EU.net> | |
13 | * Florian La Roche <flla@stud.uni-sb.de> | |
14 | * | |
15 | * Fixes: | |
16 | * Alan Cox : Volatiles in skbuff pointers. See | |
17 | * skbuff comments. May be overdone, | |
18 | * better to prove they can be removed | |
19 | * than the reverse. | |
20 | * Alan Cox : Added a zapped field for tcp to note | |
21 | * a socket is reset and must stay shut up | |
22 | * Alan Cox : New fields for options | |
23 | * Pauline Middelink : identd support | |
24 | * Alan Cox : Eliminate low level recv/recvfrom | |
25 | * David S. Miller : New socket lookup architecture. | |
26 | * Steve Whitehouse: Default routines for sock_ops | |
27 | * Arnaldo C. Melo : removed net_pinfo, tp_pinfo and made | |
28 | * protinfo be just a void pointer, as the | |
29 | * protocol specific parts were moved to | |
30 | * respective headers and ipv4/v6, etc now | |
31 | * use private slabcaches for its socks | |
32 | * Pedro Hortas : New flags field for socket options | |
33 | * | |
34 | * | |
35 | * This program is free software; you can redistribute it and/or | |
36 | * modify it under the terms of the GNU General Public License | |
37 | * as published by the Free Software Foundation; either version | |
38 | * 2 of the License, or (at your option) any later version. | |
39 | */ | |
40 | #ifndef _SOCK_H | |
41 | #define _SOCK_H | |
42 | ||
a6b7a407 | 43 | #include <linux/hardirq.h> |
172589cc | 44 | #include <linux/kernel.h> |
1da177e4 | 45 | #include <linux/list.h> |
88ab1932 | 46 | #include <linux/list_nulls.h> |
1da177e4 LT |
47 | #include <linux/timer.h> |
48 | #include <linux/cache.h> | |
a5b5bb9a | 49 | #include <linux/lockdep.h> |
1da177e4 LT |
50 | #include <linux/netdevice.h> |
51 | #include <linux/skbuff.h> /* struct sk_buff */ | |
d7fe0f24 | 52 | #include <linux/mm.h> |
1da177e4 | 53 | #include <linux/security.h> |
5a0e3ad6 | 54 | #include <linux/slab.h> |
c6e1a0d1 | 55 | #include <linux/uaccess.h> |
180d8cd9 | 56 | #include <linux/memcontrol.h> |
e1aab161 | 57 | #include <linux/res_counter.h> |
1da177e4 LT |
58 | |
59 | #include <linux/filter.h> | |
88ab1932 | 60 | #include <linux/rculist_nulls.h> |
a57de0b4 | 61 | #include <linux/poll.h> |
1da177e4 | 62 | |
c31504dc | 63 | #include <linux/atomic.h> |
1da177e4 LT |
64 | #include <net/dst.h> |
65 | #include <net/checksum.h> | |
66 | ||
9f048bfb ED |
67 | struct cgroup; |
68 | struct cgroup_subsys; | |
c607b2ed | 69 | #ifdef CONFIG_NET |
d1a4c0b3 GC |
70 | int mem_cgroup_sockets_init(struct cgroup *cgrp, struct cgroup_subsys *ss); |
71 | void mem_cgroup_sockets_destroy(struct cgroup *cgrp, struct cgroup_subsys *ss); | |
c607b2ed GC |
72 | #else |
73 | static inline | |
74 | int mem_cgroup_sockets_init(struct cgroup *cgrp, struct cgroup_subsys *ss) | |
75 | { | |
76 | return 0; | |
77 | } | |
78 | static inline | |
79 | void mem_cgroup_sockets_destroy(struct cgroup *cgrp, struct cgroup_subsys *ss) | |
80 | { | |
81 | } | |
82 | #endif | |
1da177e4 LT |
83 | /* |
84 | * This structure really needs to be cleaned up. | |
85 | * Most of it is for TCP, and not used by any of | |
86 | * the other protocols. | |
87 | */ | |
88 | ||
89 | /* Define this to get the SOCK_DBG debugging facility. */ | |
90 | #define SOCK_DEBUGGING | |
91 | #ifdef SOCK_DEBUGGING | |
92 | #define SOCK_DEBUG(sk, msg...) do { if ((sk) && sock_flag((sk), SOCK_DBG)) \ | |
93 | printk(KERN_DEBUG msg); } while (0) | |
94 | #else | |
4cd9029d | 95 | /* Validate arguments and do nothing */ |
b9075fa9 JP |
96 | static inline __printf(2, 3) |
97 | void SOCK_DEBUG(struct sock *sk, const char *msg, ...) | |
4cd9029d SH |
98 | { |
99 | } | |
1da177e4 LT |
100 | #endif |
101 | ||
102 | /* This is the per-socket lock. The spinlock provides a synchronization | |
103 | * between user contexts and software interrupt processing, whereas the | |
104 | * mini-semaphore synchronizes multiple users amongst themselves. | |
105 | */ | |
1da177e4 LT |
106 | typedef struct { |
107 | spinlock_t slock; | |
d2e9117c | 108 | int owned; |
1da177e4 | 109 | wait_queue_head_t wq; |
a5b5bb9a IM |
110 | /* |
111 | * We express the mutex-alike socket_lock semantics | |
112 | * to the lock validator by explicitly managing | |
113 | * the slock as a lock variant (in addition to | |
114 | * the slock itself): | |
115 | */ | |
116 | #ifdef CONFIG_DEBUG_LOCK_ALLOC | |
117 | struct lockdep_map dep_map; | |
118 | #endif | |
1da177e4 LT |
119 | } socket_lock_t; |
120 | ||
1da177e4 | 121 | struct sock; |
8feaf0c0 | 122 | struct proto; |
0eeb8ffc | 123 | struct net; |
1da177e4 LT |
124 | |
125 | /** | |
4dc3b16b | 126 | * struct sock_common - minimal network layer representation of sockets |
68835aba ED |
127 | * @skc_daddr: Foreign IPv4 addr |
128 | * @skc_rcv_saddr: Bound local IPv4 addr | |
4dc6dc71 | 129 | * @skc_hash: hash value used with various protocol lookup tables |
d4cada4a | 130 | * @skc_u16hashes: two u16 hash values used by UDP lookup tables |
4dc3b16b PP |
131 | * @skc_family: network address family |
132 | * @skc_state: Connection state | |
133 | * @skc_reuse: %SO_REUSEADDR setting | |
134 | * @skc_bound_dev_if: bound device index if != 0 | |
4dc3b16b | 135 | * @skc_bind_node: bind hash linkage for various protocol lookup tables |
512615b6 | 136 | * @skc_portaddr_node: second hash linkage for UDP/UDP-Lite protocol |
8feaf0c0 | 137 | * @skc_prot: protocol handlers inside a network family |
07feaebf | 138 | * @skc_net: reference to the network namespace of this socket |
68835aba ED |
139 | * @skc_node: main hash linkage for various protocol lookup tables |
140 | * @skc_nulls_node: main hash linkage for TCP/UDP/UDP-Lite protocol | |
141 | * @skc_tx_queue_mapping: tx queue number for this connection | |
142 | * @skc_refcnt: reference count | |
4dc3b16b PP |
143 | * |
144 | * This is the minimal network layer representation of sockets, the header | |
8feaf0c0 ACM |
145 | * for struct sock and struct inet_timewait_sock. |
146 | */ | |
1da177e4 | 147 | struct sock_common { |
68835aba ED |
148 | /* skc_daddr and skc_rcv_saddr must be grouped : |
149 | * cf INET_MATCH() and INET_TW_MATCH() | |
4dc6dc71 | 150 | */ |
68835aba ED |
151 | __be32 skc_daddr; |
152 | __be32 skc_rcv_saddr; | |
4dc6dc71 | 153 | |
d4cada4a ED |
154 | union { |
155 | unsigned int skc_hash; | |
156 | __u16 skc_u16hashes[2]; | |
157 | }; | |
4dc6dc71 ED |
158 | unsigned short skc_family; |
159 | volatile unsigned char skc_state; | |
160 | unsigned char skc_reuse; | |
161 | int skc_bound_dev_if; | |
512615b6 ED |
162 | union { |
163 | struct hlist_node skc_bind_node; | |
164 | struct hlist_nulls_node skc_portaddr_node; | |
165 | }; | |
8feaf0c0 | 166 | struct proto *skc_prot; |
3b1e0a65 | 167 | #ifdef CONFIG_NET_NS |
07feaebf | 168 | struct net *skc_net; |
3b1e0a65 | 169 | #endif |
68835aba ED |
170 | /* |
171 | * fields between dontcopy_begin/dontcopy_end | |
172 | * are not copied in sock_copy() | |
173 | */ | |
928c41e7 | 174 | /* private: */ |
68835aba | 175 | int skc_dontcopy_begin[0]; |
928c41e7 | 176 | /* public: */ |
68835aba ED |
177 | union { |
178 | struct hlist_node skc_node; | |
179 | struct hlist_nulls_node skc_nulls_node; | |
180 | }; | |
181 | int skc_tx_queue_mapping; | |
182 | atomic_t skc_refcnt; | |
928c41e7 | 183 | /* private: */ |
68835aba | 184 | int skc_dontcopy_end[0]; |
928c41e7 | 185 | /* public: */ |
1da177e4 LT |
186 | }; |
187 | ||
e1aab161 | 188 | struct cg_proto; |
1da177e4 LT |
189 | /** |
190 | * struct sock - network layer representation of sockets | |
8feaf0c0 | 191 | * @__sk_common: shared layout with inet_timewait_sock |
4dc3b16b PP |
192 | * @sk_shutdown: mask of %SEND_SHUTDOWN and/or %RCV_SHUTDOWN |
193 | * @sk_userlocks: %SO_SNDBUF and %SO_RCVBUF settings | |
194 | * @sk_lock: synchronizer | |
195 | * @sk_rcvbuf: size of receive buffer in bytes | |
43815482 | 196 | * @sk_wq: sock wait queue and async head |
4dc3b16b PP |
197 | * @sk_dst_cache: destination cache |
198 | * @sk_dst_lock: destination cache lock | |
199 | * @sk_policy: flow policy | |
4dc3b16b PP |
200 | * @sk_receive_queue: incoming packets |
201 | * @sk_wmem_alloc: transmit queue bytes committed | |
202 | * @sk_write_queue: Packet sending queue | |
97fc2f08 | 203 | * @sk_async_wait_queue: DMA copied packets |
4dc3b16b PP |
204 | * @sk_omem_alloc: "o" is "option" or "other" |
205 | * @sk_wmem_queued: persistent queue size | |
206 | * @sk_forward_alloc: space allocated forward | |
207 | * @sk_allocation: allocation mode | |
208 | * @sk_sndbuf: size of send buffer in bytes | |
33c732c3 | 209 | * @sk_flags: %SO_LINGER (l_onoff), %SO_BROADCAST, %SO_KEEPALIVE, |
20d49473 | 210 | * %SO_OOBINLINE settings, %SO_TIMESTAMPING settings |
4dc3b16b PP |
211 | * @sk_no_check: %SO_NO_CHECK setting, wether or not checkup packets |
212 | * @sk_route_caps: route capabilities (e.g. %NETIF_F_TSO) | |
a465419b | 213 | * @sk_route_nocaps: forbidden route capabilities (e.g NETIF_F_GSO_MASK) |
bcd76111 | 214 | * @sk_gso_type: GSO type (e.g. %SKB_GSO_TCPV4) |
82cc1a7a | 215 | * @sk_gso_max_size: Maximum GSO segment size to build |
4dc3b16b | 216 | * @sk_lingertime: %SO_LINGER l_linger setting |
4dc3b16b PP |
217 | * @sk_backlog: always used with the per-socket spinlock held |
218 | * @sk_callback_lock: used with the callbacks in the end of this struct | |
219 | * @sk_error_queue: rarely used | |
33c732c3 WC |
220 | * @sk_prot_creator: sk_prot of original sock creator (see ipv6_setsockopt, |
221 | * IPV6_ADDRFORM for instance) | |
4dc3b16b | 222 | * @sk_err: last error |
33c732c3 WC |
223 | * @sk_err_soft: errors that don't cause failure but are the cause of a |
224 | * persistent failure not just 'timed out' | |
cb61cb9b | 225 | * @sk_drops: raw/udp drops counter |
4dc3b16b PP |
226 | * @sk_ack_backlog: current listen backlog |
227 | * @sk_max_ack_backlog: listen backlog set in listen() | |
228 | * @sk_priority: %SO_PRIORITY setting | |
1a3bc369 | 229 | * @sk_cgrp_prioidx: socket group's priority map index |
4dc3b16b PP |
230 | * @sk_type: socket type (%SOCK_STREAM, etc) |
231 | * @sk_protocol: which protocol this socket belongs in this network family | |
53c3fa20 RD |
232 | * @sk_peer_pid: &struct pid for this socket's peer |
233 | * @sk_peer_cred: %SO_PEERCRED setting | |
4dc3b16b PP |
234 | * @sk_rcvlowat: %SO_RCVLOWAT setting |
235 | * @sk_rcvtimeo: %SO_RCVTIMEO setting | |
236 | * @sk_sndtimeo: %SO_SNDTIMEO setting | |
c58dc01b | 237 | * @sk_rxhash: flow hash received from netif layer |
4dc3b16b PP |
238 | * @sk_filter: socket filtering instructions |
239 | * @sk_protinfo: private area, net family specific, when not using slab | |
240 | * @sk_timer: sock cleanup timer | |
241 | * @sk_stamp: time stamp of last packet received | |
242 | * @sk_socket: Identd and reporting IO signals | |
243 | * @sk_user_data: RPC layer private data | |
244 | * @sk_sndmsg_page: cached page for sendmsg | |
245 | * @sk_sndmsg_off: cached offset for sendmsg | |
246 | * @sk_send_head: front of stuff to transmit | |
67be2dd1 | 247 | * @sk_security: used by security modules |
31729363 | 248 | * @sk_mark: generic packet mark |
53c3fa20 | 249 | * @sk_classid: this socket's cgroup classid |
e1aab161 | 250 | * @sk_cgrp: this socket's cgroup-specific proto data |
4dc3b16b PP |
251 | * @sk_write_pending: a write to stream socket waits to start |
252 | * @sk_state_change: callback to indicate change in the state of the sock | |
253 | * @sk_data_ready: callback to indicate there is data to be processed | |
254 | * @sk_write_space: callback to indicate there is bf sending space available | |
255 | * @sk_error_report: callback to indicate errors (e.g. %MSG_ERRQUEUE) | |
256 | * @sk_backlog_rcv: callback to process the backlog | |
257 | * @sk_destruct: called at sock freeing time, i.e. when all refcnt == 0 | |
1da177e4 LT |
258 | */ |
259 | struct sock { | |
260 | /* | |
8feaf0c0 | 261 | * Now struct inet_timewait_sock also uses sock_common, so please just |
1da177e4 LT |
262 | * don't add nothing before this first member (__sk_common) --acme |
263 | */ | |
264 | struct sock_common __sk_common; | |
4dc6dc71 ED |
265 | #define sk_node __sk_common.skc_node |
266 | #define sk_nulls_node __sk_common.skc_nulls_node | |
267 | #define sk_refcnt __sk_common.skc_refcnt | |
e022f0b4 | 268 | #define sk_tx_queue_mapping __sk_common.skc_tx_queue_mapping |
4dc6dc71 | 269 | |
68835aba ED |
270 | #define sk_dontcopy_begin __sk_common.skc_dontcopy_begin |
271 | #define sk_dontcopy_end __sk_common.skc_dontcopy_end | |
4dc6dc71 | 272 | #define sk_hash __sk_common.skc_hash |
1da177e4 LT |
273 | #define sk_family __sk_common.skc_family |
274 | #define sk_state __sk_common.skc_state | |
275 | #define sk_reuse __sk_common.skc_reuse | |
276 | #define sk_bound_dev_if __sk_common.skc_bound_dev_if | |
1da177e4 | 277 | #define sk_bind_node __sk_common.skc_bind_node |
8feaf0c0 | 278 | #define sk_prot __sk_common.skc_prot |
07feaebf | 279 | #define sk_net __sk_common.skc_net |
1da177e4 | 280 | socket_lock_t sk_lock; |
b178bb3d | 281 | struct sk_buff_head sk_receive_queue; |
fa438ccf ED |
282 | /* |
283 | * The backlog queue is special, it is always used with | |
284 | * the per-socket spinlock held and requires low latency | |
285 | * access. Therefore we special case it's implementation. | |
b178bb3d ED |
286 | * Note : rmem_alloc is in this structure to fill a hole |
287 | * on 64bit arches, not because its logically part of | |
288 | * backlog. | |
fa438ccf ED |
289 | */ |
290 | struct { | |
b178bb3d ED |
291 | atomic_t rmem_alloc; |
292 | int len; | |
293 | struct sk_buff *head; | |
294 | struct sk_buff *tail; | |
fa438ccf | 295 | } sk_backlog; |
b178bb3d ED |
296 | #define sk_rmem_alloc sk_backlog.rmem_alloc |
297 | int sk_forward_alloc; | |
298 | #ifdef CONFIG_RPS | |
299 | __u32 sk_rxhash; | |
300 | #endif | |
301 | atomic_t sk_drops; | |
302 | int sk_rcvbuf; | |
303 | ||
304 | struct sk_filter __rcu *sk_filter; | |
eaefd110 | 305 | struct socket_wq __rcu *sk_wq; |
b178bb3d ED |
306 | |
307 | #ifdef CONFIG_NET_DMA | |
308 | struct sk_buff_head sk_async_wait_queue; | |
309 | #endif | |
310 | ||
def8b4fa | 311 | #ifdef CONFIG_XFRM |
1da177e4 | 312 | struct xfrm_policy *sk_policy[2]; |
def8b4fa | 313 | #endif |
b178bb3d ED |
314 | unsigned long sk_flags; |
315 | struct dst_entry *sk_dst_cache; | |
b6c6712a | 316 | spinlock_t sk_dst_lock; |
1da177e4 LT |
317 | atomic_t sk_wmem_alloc; |
318 | atomic_t sk_omem_alloc; | |
4e07a91c | 319 | int sk_sndbuf; |
1da177e4 | 320 | struct sk_buff_head sk_write_queue; |
b178bb3d ED |
321 | kmemcheck_bitfield_begin(flags); |
322 | unsigned int sk_shutdown : 2, | |
323 | sk_no_check : 2, | |
324 | sk_userlocks : 4, | |
325 | sk_protocol : 8, | |
326 | sk_type : 16; | |
327 | kmemcheck_bitfield_end(flags); | |
1da177e4 | 328 | int sk_wmem_queued; |
7d877f3b | 329 | gfp_t sk_allocation; |
c8f44aff MM |
330 | netdev_features_t sk_route_caps; |
331 | netdev_features_t sk_route_nocaps; | |
bcd76111 | 332 | int sk_gso_type; |
82cc1a7a | 333 | unsigned int sk_gso_max_size; |
9932cf95 | 334 | int sk_rcvlowat; |
1da177e4 | 335 | unsigned long sk_lingertime; |
1da177e4 | 336 | struct sk_buff_head sk_error_queue; |
476e19cf | 337 | struct proto *sk_prot_creator; |
1da177e4 LT |
338 | rwlock_t sk_callback_lock; |
339 | int sk_err, | |
340 | sk_err_soft; | |
341 | unsigned short sk_ack_backlog; | |
342 | unsigned short sk_max_ack_backlog; | |
343 | __u32 sk_priority; | |
5bc1421e NH |
344 | #ifdef CONFIG_CGROUPS |
345 | __u32 sk_cgrp_prioidx; | |
346 | #endif | |
109f6e39 EB |
347 | struct pid *sk_peer_pid; |
348 | const struct cred *sk_peer_cred; | |
1da177e4 LT |
349 | long sk_rcvtimeo; |
350 | long sk_sndtimeo; | |
1da177e4 LT |
351 | void *sk_protinfo; |
352 | struct timer_list sk_timer; | |
b7aa0bf7 | 353 | ktime_t sk_stamp; |
1da177e4 LT |
354 | struct socket *sk_socket; |
355 | void *sk_user_data; | |
356 | struct page *sk_sndmsg_page; | |
357 | struct sk_buff *sk_send_head; | |
358 | __u32 sk_sndmsg_off; | |
359 | int sk_write_pending; | |
d5f64238 | 360 | #ifdef CONFIG_SECURITY |
1da177e4 | 361 | void *sk_security; |
d5f64238 | 362 | #endif |
4a19ec58 | 363 | __u32 sk_mark; |
f8451725 | 364 | u32 sk_classid; |
e1aab161 | 365 | struct cg_proto *sk_cgrp; |
1da177e4 LT |
366 | void (*sk_state_change)(struct sock *sk); |
367 | void (*sk_data_ready)(struct sock *sk, int bytes); | |
368 | void (*sk_write_space)(struct sock *sk); | |
369 | void (*sk_error_report)(struct sock *sk); | |
370 | int (*sk_backlog_rcv)(struct sock *sk, | |
371 | struct sk_buff *skb); | |
372 | void (*sk_destruct)(struct sock *sk); | |
373 | }; | |
374 | ||
375 | /* | |
376 | * Hashed lists helper routines | |
377 | */ | |
c4146644 LZ |
378 | static inline struct sock *sk_entry(const struct hlist_node *node) |
379 | { | |
380 | return hlist_entry(node, struct sock, sk_node); | |
381 | } | |
382 | ||
e48c414e | 383 | static inline struct sock *__sk_head(const struct hlist_head *head) |
1da177e4 LT |
384 | { |
385 | return hlist_entry(head->first, struct sock, sk_node); | |
386 | } | |
387 | ||
e48c414e | 388 | static inline struct sock *sk_head(const struct hlist_head *head) |
1da177e4 LT |
389 | { |
390 | return hlist_empty(head) ? NULL : __sk_head(head); | |
391 | } | |
392 | ||
88ab1932 ED |
393 | static inline struct sock *__sk_nulls_head(const struct hlist_nulls_head *head) |
394 | { | |
395 | return hlist_nulls_entry(head->first, struct sock, sk_nulls_node); | |
396 | } | |
397 | ||
398 | static inline struct sock *sk_nulls_head(const struct hlist_nulls_head *head) | |
399 | { | |
400 | return hlist_nulls_empty(head) ? NULL : __sk_nulls_head(head); | |
401 | } | |
402 | ||
e48c414e | 403 | static inline struct sock *sk_next(const struct sock *sk) |
1da177e4 LT |
404 | { |
405 | return sk->sk_node.next ? | |
406 | hlist_entry(sk->sk_node.next, struct sock, sk_node) : NULL; | |
407 | } | |
408 | ||
88ab1932 ED |
409 | static inline struct sock *sk_nulls_next(const struct sock *sk) |
410 | { | |
411 | return (!is_a_nulls(sk->sk_nulls_node.next)) ? | |
412 | hlist_nulls_entry(sk->sk_nulls_node.next, | |
413 | struct sock, sk_nulls_node) : | |
414 | NULL; | |
415 | } | |
416 | ||
e48c414e | 417 | static inline int sk_unhashed(const struct sock *sk) |
1da177e4 LT |
418 | { |
419 | return hlist_unhashed(&sk->sk_node); | |
420 | } | |
421 | ||
e48c414e | 422 | static inline int sk_hashed(const struct sock *sk) |
1da177e4 | 423 | { |
da753bea | 424 | return !sk_unhashed(sk); |
1da177e4 LT |
425 | } |
426 | ||
427 | static __inline__ void sk_node_init(struct hlist_node *node) | |
428 | { | |
429 | node->pprev = NULL; | |
430 | } | |
431 | ||
88ab1932 ED |
432 | static __inline__ void sk_nulls_node_init(struct hlist_nulls_node *node) |
433 | { | |
434 | node->pprev = NULL; | |
435 | } | |
436 | ||
1da177e4 LT |
437 | static __inline__ void __sk_del_node(struct sock *sk) |
438 | { | |
439 | __hlist_del(&sk->sk_node); | |
440 | } | |
441 | ||
808f5114 | 442 | /* NB: equivalent to hlist_del_init_rcu */ |
1da177e4 LT |
443 | static __inline__ int __sk_del_node_init(struct sock *sk) |
444 | { | |
445 | if (sk_hashed(sk)) { | |
446 | __sk_del_node(sk); | |
447 | sk_node_init(&sk->sk_node); | |
448 | return 1; | |
449 | } | |
450 | return 0; | |
451 | } | |
452 | ||
453 | /* Grab socket reference count. This operation is valid only | |
454 | when sk is ALREADY grabbed f.e. it is found in hash table | |
455 | or a list and the lookup is made under lock preventing hash table | |
456 | modifications. | |
457 | */ | |
458 | ||
459 | static inline void sock_hold(struct sock *sk) | |
460 | { | |
461 | atomic_inc(&sk->sk_refcnt); | |
462 | } | |
463 | ||
464 | /* Ungrab socket in the context, which assumes that socket refcnt | |
465 | cannot hit zero, f.e. it is true in context of any socketcall. | |
466 | */ | |
467 | static inline void __sock_put(struct sock *sk) | |
468 | { | |
469 | atomic_dec(&sk->sk_refcnt); | |
470 | } | |
471 | ||
472 | static __inline__ int sk_del_node_init(struct sock *sk) | |
473 | { | |
474 | int rc = __sk_del_node_init(sk); | |
475 | ||
476 | if (rc) { | |
477 | /* paranoid for a while -acme */ | |
478 | WARN_ON(atomic_read(&sk->sk_refcnt) == 1); | |
479 | __sock_put(sk); | |
480 | } | |
481 | return rc; | |
482 | } | |
808f5114 | 483 | #define sk_del_node_init_rcu(sk) sk_del_node_init(sk) |
1da177e4 | 484 | |
88ab1932 | 485 | static __inline__ int __sk_nulls_del_node_init_rcu(struct sock *sk) |
271b72c7 ED |
486 | { |
487 | if (sk_hashed(sk)) { | |
88ab1932 | 488 | hlist_nulls_del_init_rcu(&sk->sk_nulls_node); |
271b72c7 ED |
489 | return 1; |
490 | } | |
491 | return 0; | |
492 | } | |
493 | ||
88ab1932 | 494 | static __inline__ int sk_nulls_del_node_init_rcu(struct sock *sk) |
271b72c7 | 495 | { |
88ab1932 | 496 | int rc = __sk_nulls_del_node_init_rcu(sk); |
271b72c7 ED |
497 | |
498 | if (rc) { | |
499 | /* paranoid for a while -acme */ | |
500 | WARN_ON(atomic_read(&sk->sk_refcnt) == 1); | |
501 | __sock_put(sk); | |
502 | } | |
503 | return rc; | |
504 | } | |
505 | ||
1da177e4 LT |
506 | static __inline__ void __sk_add_node(struct sock *sk, struct hlist_head *list) |
507 | { | |
508 | hlist_add_head(&sk->sk_node, list); | |
509 | } | |
510 | ||
511 | static __inline__ void sk_add_node(struct sock *sk, struct hlist_head *list) | |
512 | { | |
513 | sock_hold(sk); | |
514 | __sk_add_node(sk, list); | |
515 | } | |
516 | ||
808f5114 | 517 | static __inline__ void sk_add_node_rcu(struct sock *sk, struct hlist_head *list) |
518 | { | |
519 | sock_hold(sk); | |
520 | hlist_add_head_rcu(&sk->sk_node, list); | |
521 | } | |
522 | ||
88ab1932 | 523 | static __inline__ void __sk_nulls_add_node_rcu(struct sock *sk, struct hlist_nulls_head *list) |
271b72c7 | 524 | { |
88ab1932 | 525 | hlist_nulls_add_head_rcu(&sk->sk_nulls_node, list); |
271b72c7 ED |
526 | } |
527 | ||
88ab1932 | 528 | static __inline__ void sk_nulls_add_node_rcu(struct sock *sk, struct hlist_nulls_head *list) |
271b72c7 ED |
529 | { |
530 | sock_hold(sk); | |
88ab1932 | 531 | __sk_nulls_add_node_rcu(sk, list); |
271b72c7 ED |
532 | } |
533 | ||
1da177e4 LT |
534 | static __inline__ void __sk_del_bind_node(struct sock *sk) |
535 | { | |
536 | __hlist_del(&sk->sk_bind_node); | |
537 | } | |
538 | ||
539 | static __inline__ void sk_add_bind_node(struct sock *sk, | |
540 | struct hlist_head *list) | |
541 | { | |
542 | hlist_add_head(&sk->sk_bind_node, list); | |
543 | } | |
544 | ||
545 | #define sk_for_each(__sk, node, list) \ | |
546 | hlist_for_each_entry(__sk, node, list, sk_node) | |
808f5114 | 547 | #define sk_for_each_rcu(__sk, node, list) \ |
548 | hlist_for_each_entry_rcu(__sk, node, list, sk_node) | |
88ab1932 ED |
549 | #define sk_nulls_for_each(__sk, node, list) \ |
550 | hlist_nulls_for_each_entry(__sk, node, list, sk_nulls_node) | |
551 | #define sk_nulls_for_each_rcu(__sk, node, list) \ | |
552 | hlist_nulls_for_each_entry_rcu(__sk, node, list, sk_nulls_node) | |
1da177e4 LT |
553 | #define sk_for_each_from(__sk, node) \ |
554 | if (__sk && ({ node = &(__sk)->sk_node; 1; })) \ | |
555 | hlist_for_each_entry_from(__sk, node, sk_node) | |
88ab1932 ED |
556 | #define sk_nulls_for_each_from(__sk, node) \ |
557 | if (__sk && ({ node = &(__sk)->sk_nulls_node; 1; })) \ | |
558 | hlist_nulls_for_each_entry_from(__sk, node, sk_nulls_node) | |
1da177e4 LT |
559 | #define sk_for_each_safe(__sk, node, tmp, list) \ |
560 | hlist_for_each_entry_safe(__sk, node, tmp, list, sk_node) | |
561 | #define sk_for_each_bound(__sk, node, list) \ | |
562 | hlist_for_each_entry(__sk, node, list, sk_bind_node) | |
563 | ||
564 | /* Sock flags */ | |
565 | enum sock_flags { | |
566 | SOCK_DEAD, | |
567 | SOCK_DONE, | |
568 | SOCK_URGINLINE, | |
569 | SOCK_KEEPOPEN, | |
570 | SOCK_LINGER, | |
571 | SOCK_DESTROY, | |
572 | SOCK_BROADCAST, | |
573 | SOCK_TIMESTAMP, | |
574 | SOCK_ZAPPED, | |
575 | SOCK_USE_WRITE_QUEUE, /* whether to call sk->sk_write_space in sock_wfree */ | |
576 | SOCK_DBG, /* %SO_DEBUG setting */ | |
577 | SOCK_RCVTSTAMP, /* %SO_TIMESTAMP setting */ | |
92f37fd2 | 578 | SOCK_RCVTSTAMPNS, /* %SO_TIMESTAMPNS setting */ |
1da177e4 LT |
579 | SOCK_LOCALROUTE, /* route locally only, %SO_DONTROUTE setting */ |
580 | SOCK_QUEUE_SHRUNK, /* write queue has been shrunk recently */ | |
20d49473 PO |
581 | SOCK_TIMESTAMPING_TX_HARDWARE, /* %SOF_TIMESTAMPING_TX_HARDWARE */ |
582 | SOCK_TIMESTAMPING_TX_SOFTWARE, /* %SOF_TIMESTAMPING_TX_SOFTWARE */ | |
583 | SOCK_TIMESTAMPING_RX_HARDWARE, /* %SOF_TIMESTAMPING_RX_HARDWARE */ | |
584 | SOCK_TIMESTAMPING_RX_SOFTWARE, /* %SOF_TIMESTAMPING_RX_SOFTWARE */ | |
585 | SOCK_TIMESTAMPING_SOFTWARE, /* %SOF_TIMESTAMPING_SOFTWARE */ | |
586 | SOCK_TIMESTAMPING_RAW_HARDWARE, /* %SOF_TIMESTAMPING_RAW_HARDWARE */ | |
587 | SOCK_TIMESTAMPING_SYS_HARDWARE, /* %SOF_TIMESTAMPING_SYS_HARDWARE */ | |
bcdce719 | 588 | SOCK_FASYNC, /* fasync() active */ |
3b885787 | 589 | SOCK_RXQ_OVFL, |
1cdebb42 | 590 | SOCK_ZEROCOPY, /* buffers from userspace */ |
6e3e939f | 591 | SOCK_WIFI_STATUS, /* push wifi status to userspace */ |
1da177e4 LT |
592 | }; |
593 | ||
53b924b3 RB |
594 | static inline void sock_copy_flags(struct sock *nsk, struct sock *osk) |
595 | { | |
596 | nsk->sk_flags = osk->sk_flags; | |
597 | } | |
598 | ||
1da177e4 LT |
599 | static inline void sock_set_flag(struct sock *sk, enum sock_flags flag) |
600 | { | |
601 | __set_bit(flag, &sk->sk_flags); | |
602 | } | |
603 | ||
604 | static inline void sock_reset_flag(struct sock *sk, enum sock_flags flag) | |
605 | { | |
606 | __clear_bit(flag, &sk->sk_flags); | |
607 | } | |
608 | ||
609 | static inline int sock_flag(struct sock *sk, enum sock_flags flag) | |
610 | { | |
611 | return test_bit(flag, &sk->sk_flags); | |
612 | } | |
613 | ||
614 | static inline void sk_acceptq_removed(struct sock *sk) | |
615 | { | |
616 | sk->sk_ack_backlog--; | |
617 | } | |
618 | ||
619 | static inline void sk_acceptq_added(struct sock *sk) | |
620 | { | |
621 | sk->sk_ack_backlog++; | |
622 | } | |
623 | ||
624 | static inline int sk_acceptq_is_full(struct sock *sk) | |
625 | { | |
64a14651 | 626 | return sk->sk_ack_backlog > sk->sk_max_ack_backlog; |
1da177e4 LT |
627 | } |
628 | ||
629 | /* | |
630 | * Compute minimal free write space needed to queue new packets. | |
631 | */ | |
632 | static inline int sk_stream_min_wspace(struct sock *sk) | |
633 | { | |
8df09ea3 | 634 | return sk->sk_wmem_queued >> 1; |
1da177e4 LT |
635 | } |
636 | ||
637 | static inline int sk_stream_wspace(struct sock *sk) | |
638 | { | |
639 | return sk->sk_sndbuf - sk->sk_wmem_queued; | |
640 | } | |
641 | ||
642 | extern void sk_stream_write_space(struct sock *sk); | |
643 | ||
644 | static inline int sk_stream_memory_free(struct sock *sk) | |
645 | { | |
646 | return sk->sk_wmem_queued < sk->sk_sndbuf; | |
647 | } | |
648 | ||
8eae939f | 649 | /* OOB backlog add */ |
a3a858ff | 650 | static inline void __sk_add_backlog(struct sock *sk, struct sk_buff *skb) |
9ee6b535 | 651 | { |
7fee226a ED |
652 | /* dont let skb dst not refcounted, we are going to leave rcu lock */ |
653 | skb_dst_force(skb); | |
654 | ||
655 | if (!sk->sk_backlog.tail) | |
656 | sk->sk_backlog.head = skb; | |
657 | else | |
9ee6b535 | 658 | sk->sk_backlog.tail->next = skb; |
7fee226a ED |
659 | |
660 | sk->sk_backlog.tail = skb; | |
9ee6b535 SH |
661 | skb->next = NULL; |
662 | } | |
1da177e4 | 663 | |
c377411f ED |
664 | /* |
665 | * Take into account size of receive queue and backlog queue | |
0fd7bac6 ED |
666 | * Do not take into account this skb truesize, |
667 | * to allow even a single big packet to come. | |
c377411f ED |
668 | */ |
669 | static inline bool sk_rcvqueues_full(const struct sock *sk, const struct sk_buff *skb) | |
670 | { | |
671 | unsigned int qsize = sk->sk_backlog.len + atomic_read(&sk->sk_rmem_alloc); | |
672 | ||
0fd7bac6 | 673 | return qsize > sk->sk_rcvbuf; |
c377411f ED |
674 | } |
675 | ||
8eae939f | 676 | /* The per-socket spinlock must be held here. */ |
40456353 | 677 | static inline __must_check int sk_add_backlog(struct sock *sk, struct sk_buff *skb) |
8eae939f | 678 | { |
c377411f | 679 | if (sk_rcvqueues_full(sk, skb)) |
8eae939f ZY |
680 | return -ENOBUFS; |
681 | ||
a3a858ff | 682 | __sk_add_backlog(sk, skb); |
8eae939f ZY |
683 | sk->sk_backlog.len += skb->truesize; |
684 | return 0; | |
685 | } | |
686 | ||
c57943a1 PZ |
687 | static inline int sk_backlog_rcv(struct sock *sk, struct sk_buff *skb) |
688 | { | |
689 | return sk->sk_backlog_rcv(sk, skb); | |
690 | } | |
691 | ||
c58dc01b DM |
692 | static inline void sock_rps_record_flow(const struct sock *sk) |
693 | { | |
694 | #ifdef CONFIG_RPS | |
695 | struct rps_sock_flow_table *sock_flow_table; | |
696 | ||
697 | rcu_read_lock(); | |
698 | sock_flow_table = rcu_dereference(rps_sock_flow_table); | |
699 | rps_record_sock_flow(sock_flow_table, sk->sk_rxhash); | |
700 | rcu_read_unlock(); | |
701 | #endif | |
702 | } | |
703 | ||
704 | static inline void sock_rps_reset_flow(const struct sock *sk) | |
705 | { | |
706 | #ifdef CONFIG_RPS | |
707 | struct rps_sock_flow_table *sock_flow_table; | |
708 | ||
709 | rcu_read_lock(); | |
710 | sock_flow_table = rcu_dereference(rps_sock_flow_table); | |
711 | rps_reset_sock_flow(sock_flow_table, sk->sk_rxhash); | |
712 | rcu_read_unlock(); | |
713 | #endif | |
714 | } | |
715 | ||
bdeab991 TH |
716 | static inline void sock_rps_save_rxhash(struct sock *sk, |
717 | const struct sk_buff *skb) | |
c58dc01b DM |
718 | { |
719 | #ifdef CONFIG_RPS | |
bdeab991 | 720 | if (unlikely(sk->sk_rxhash != skb->rxhash)) { |
c58dc01b | 721 | sock_rps_reset_flow(sk); |
bdeab991 | 722 | sk->sk_rxhash = skb->rxhash; |
c58dc01b DM |
723 | } |
724 | #endif | |
725 | } | |
726 | ||
bdeab991 TH |
727 | static inline void sock_rps_reset_rxhash(struct sock *sk) |
728 | { | |
729 | #ifdef CONFIG_RPS | |
730 | sock_rps_reset_flow(sk); | |
731 | sk->sk_rxhash = 0; | |
732 | #endif | |
733 | } | |
734 | ||
cfcabdcc SH |
735 | #define sk_wait_event(__sk, __timeo, __condition) \ |
736 | ({ int __rc; \ | |
737 | release_sock(__sk); \ | |
738 | __rc = __condition; \ | |
739 | if (!__rc) { \ | |
740 | *(__timeo) = schedule_timeout(*(__timeo)); \ | |
741 | } \ | |
742 | lock_sock(__sk); \ | |
743 | __rc = __condition; \ | |
744 | __rc; \ | |
745 | }) | |
1da177e4 LT |
746 | |
747 | extern int sk_stream_wait_connect(struct sock *sk, long *timeo_p); | |
748 | extern int sk_stream_wait_memory(struct sock *sk, long *timeo_p); | |
749 | extern void sk_stream_wait_close(struct sock *sk, long timeo_p); | |
750 | extern int sk_stream_error(struct sock *sk, int flags, int err); | |
751 | extern void sk_stream_kill_queues(struct sock *sk); | |
752 | ||
753 | extern int sk_wait_data(struct sock *sk, long *timeo); | |
754 | ||
60236fdd | 755 | struct request_sock_ops; |
6d6ee43e | 756 | struct timewait_sock_ops; |
ab1e0a13 | 757 | struct inet_hashinfo; |
fc8717ba | 758 | struct raw_hashinfo; |
de477254 | 759 | struct module; |
2e6599cb | 760 | |
1da177e4 LT |
761 | /* Networking protocol blocks we attach to sockets. |
762 | * socket layer -> transport layer interface | |
763 | * transport -> network interface is defined by struct inet_proto | |
764 | */ | |
765 | struct proto { | |
766 | void (*close)(struct sock *sk, | |
767 | long timeout); | |
768 | int (*connect)(struct sock *sk, | |
769 | struct sockaddr *uaddr, | |
770 | int addr_len); | |
771 | int (*disconnect)(struct sock *sk, int flags); | |
772 | ||
773 | struct sock * (*accept) (struct sock *sk, int flags, int *err); | |
774 | ||
775 | int (*ioctl)(struct sock *sk, int cmd, | |
776 | unsigned long arg); | |
777 | int (*init)(struct sock *sk); | |
7d06b2e0 | 778 | void (*destroy)(struct sock *sk); |
1da177e4 LT |
779 | void (*shutdown)(struct sock *sk, int how); |
780 | int (*setsockopt)(struct sock *sk, int level, | |
781 | int optname, char __user *optval, | |
b7058842 | 782 | unsigned int optlen); |
1da177e4 LT |
783 | int (*getsockopt)(struct sock *sk, int level, |
784 | int optname, char __user *optval, | |
785 | int __user *option); | |
af01d537 | 786 | #ifdef CONFIG_COMPAT |
3fdadf7d DM |
787 | int (*compat_setsockopt)(struct sock *sk, |
788 | int level, | |
789 | int optname, char __user *optval, | |
b7058842 | 790 | unsigned int optlen); |
3fdadf7d DM |
791 | int (*compat_getsockopt)(struct sock *sk, |
792 | int level, | |
793 | int optname, char __user *optval, | |
794 | int __user *option); | |
709b46e8 EB |
795 | int (*compat_ioctl)(struct sock *sk, |
796 | unsigned int cmd, unsigned long arg); | |
af01d537 | 797 | #endif |
1da177e4 LT |
798 | int (*sendmsg)(struct kiocb *iocb, struct sock *sk, |
799 | struct msghdr *msg, size_t len); | |
800 | int (*recvmsg)(struct kiocb *iocb, struct sock *sk, | |
801 | struct msghdr *msg, | |
802 | size_t len, int noblock, int flags, | |
803 | int *addr_len); | |
804 | int (*sendpage)(struct sock *sk, struct page *page, | |
805 | int offset, size_t size, int flags); | |
806 | int (*bind)(struct sock *sk, | |
807 | struct sockaddr *uaddr, int addr_len); | |
808 | ||
809 | int (*backlog_rcv) (struct sock *sk, | |
810 | struct sk_buff *skb); | |
811 | ||
812 | /* Keeping track of sk's, looking them up, and port selection methods. */ | |
813 | void (*hash)(struct sock *sk); | |
814 | void (*unhash)(struct sock *sk); | |
719f8358 | 815 | void (*rehash)(struct sock *sk); |
1da177e4 | 816 | int (*get_port)(struct sock *sk, unsigned short snum); |
fcbdf09d | 817 | void (*clear_sk)(struct sock *sk, int size); |
1da177e4 | 818 | |
286ab3d4 | 819 | /* Keeping track of sockets in use */ |
65f76517 | 820 | #ifdef CONFIG_PROC_FS |
13ff3d6f | 821 | unsigned int inuse_idx; |
65f76517 | 822 | #endif |
ebb53d75 | 823 | |
1da177e4 | 824 | /* Memory pressure */ |
5c52ba17 | 825 | void (*enter_memory_pressure)(struct sock *sk); |
8d987e5c | 826 | atomic_long_t *memory_allocated; /* Current allocated memory. */ |
1748376b | 827 | struct percpu_counter *sockets_allocated; /* Current number of sockets. */ |
1da177e4 LT |
828 | /* |
829 | * Pressure flag: try to collapse. | |
830 | * Technical note: it is used by multiple contexts non atomically. | |
3ab224be | 831 | * All the __sk_mem_schedule() is of this nature: accounting |
1da177e4 LT |
832 | * is strict, actions are advisory and have some latency. |
833 | */ | |
834 | int *memory_pressure; | |
8d987e5c | 835 | long *sysctl_mem; |
1da177e4 LT |
836 | int *sysctl_wmem; |
837 | int *sysctl_rmem; | |
838 | int max_header; | |
7ba42910 | 839 | bool no_autobind; |
1da177e4 | 840 | |
271b72c7 | 841 | struct kmem_cache *slab; |
1da177e4 | 842 | unsigned int obj_size; |
271b72c7 | 843 | int slab_flags; |
1da177e4 | 844 | |
dd24c001 | 845 | struct percpu_counter *orphan_count; |
8feaf0c0 | 846 | |
60236fdd | 847 | struct request_sock_ops *rsk_prot; |
6d6ee43e | 848 | struct timewait_sock_ops *twsk_prot; |
2e6599cb | 849 | |
39d8cda7 PE |
850 | union { |
851 | struct inet_hashinfo *hashinfo; | |
645ca708 | 852 | struct udp_table *udp_table; |
fc8717ba | 853 | struct raw_hashinfo *raw_hash; |
39d8cda7 | 854 | } h; |
ab1e0a13 | 855 | |
1da177e4 LT |
856 | struct module *owner; |
857 | ||
858 | char name[32]; | |
859 | ||
860 | struct list_head node; | |
e6848976 ACM |
861 | #ifdef SOCK_REFCNT_DEBUG |
862 | atomic_t socks; | |
863 | #endif | |
e1aab161 GC |
864 | #ifdef CONFIG_CGROUP_MEM_RES_CTLR_KMEM |
865 | /* | |
866 | * cgroup specific init/deinit functions. Called once for all | |
867 | * protocols that implement it, from cgroups populate function. | |
868 | * This function has to setup any files the protocol want to | |
869 | * appear in the kmem cgroup filesystem. | |
870 | */ | |
871 | int (*init_cgroup)(struct cgroup *cgrp, | |
872 | struct cgroup_subsys *ss); | |
873 | void (*destroy_cgroup)(struct cgroup *cgrp, | |
874 | struct cgroup_subsys *ss); | |
875 | struct cg_proto *(*proto_cgroup)(struct mem_cgroup *memcg); | |
876 | #endif | |
877 | }; | |
878 | ||
879 | struct cg_proto { | |
880 | void (*enter_memory_pressure)(struct sock *sk); | |
881 | struct res_counter *memory_allocated; /* Current allocated memory. */ | |
882 | struct percpu_counter *sockets_allocated; /* Current number of sockets. */ | |
883 | int *memory_pressure; | |
884 | long *sysctl_mem; | |
885 | /* | |
886 | * memcg field is used to find which memcg we belong directly | |
887 | * Each memcg struct can hold more than one cg_proto, so container_of | |
888 | * won't really cut. | |
889 | * | |
890 | * The elegant solution would be having an inverse function to | |
891 | * proto_cgroup in struct proto, but that means polluting the structure | |
892 | * for everybody, instead of just for memcg users. | |
893 | */ | |
894 | struct mem_cgroup *memcg; | |
1da177e4 LT |
895 | }; |
896 | ||
897 | extern int proto_register(struct proto *prot, int alloc_slab); | |
898 | extern void proto_unregister(struct proto *prot); | |
899 | ||
e6848976 ACM |
900 | #ifdef SOCK_REFCNT_DEBUG |
901 | static inline void sk_refcnt_debug_inc(struct sock *sk) | |
902 | { | |
903 | atomic_inc(&sk->sk_prot->socks); | |
904 | } | |
905 | ||
906 | static inline void sk_refcnt_debug_dec(struct sock *sk) | |
907 | { | |
908 | atomic_dec(&sk->sk_prot->socks); | |
909 | printk(KERN_DEBUG "%s socket %p released, %d are still alive\n", | |
910 | sk->sk_prot->name, sk, atomic_read(&sk->sk_prot->socks)); | |
911 | } | |
912 | ||
e1aab161 | 913 | inline void sk_refcnt_debug_release(const struct sock *sk) |
e6848976 ACM |
914 | { |
915 | if (atomic_read(&sk->sk_refcnt) != 1) | |
916 | printk(KERN_DEBUG "Destruction of the %s socket %p delayed, refcnt=%d\n", | |
917 | sk->sk_prot->name, sk, atomic_read(&sk->sk_refcnt)); | |
918 | } | |
919 | #else /* SOCK_REFCNT_DEBUG */ | |
920 | #define sk_refcnt_debug_inc(sk) do { } while (0) | |
921 | #define sk_refcnt_debug_dec(sk) do { } while (0) | |
922 | #define sk_refcnt_debug_release(sk) do { } while (0) | |
923 | #endif /* SOCK_REFCNT_DEBUG */ | |
924 | ||
376be5ff | 925 | #if defined(CONFIG_CGROUP_MEM_RES_CTLR_KMEM) && defined(CONFIG_NET) |
e1aab161 GC |
926 | extern struct jump_label_key memcg_socket_limit_enabled; |
927 | static inline struct cg_proto *parent_cg_proto(struct proto *proto, | |
928 | struct cg_proto *cg_proto) | |
929 | { | |
930 | return proto->proto_cgroup(parent_mem_cgroup(cg_proto->memcg)); | |
931 | } | |
932 | #define mem_cgroup_sockets_enabled static_branch(&memcg_socket_limit_enabled) | |
933 | #else | |
934 | #define mem_cgroup_sockets_enabled 0 | |
935 | static inline struct cg_proto *parent_cg_proto(struct proto *proto, | |
936 | struct cg_proto *cg_proto) | |
937 | { | |
938 | return NULL; | |
939 | } | |
940 | #endif | |
941 | ||
942 | ||
180d8cd9 GC |
943 | static inline bool sk_has_memory_pressure(const struct sock *sk) |
944 | { | |
945 | return sk->sk_prot->memory_pressure != NULL; | |
946 | } | |
947 | ||
948 | static inline bool sk_under_memory_pressure(const struct sock *sk) | |
949 | { | |
950 | if (!sk->sk_prot->memory_pressure) | |
951 | return false; | |
e1aab161 GC |
952 | |
953 | if (mem_cgroup_sockets_enabled && sk->sk_cgrp) | |
954 | return !!*sk->sk_cgrp->memory_pressure; | |
955 | ||
180d8cd9 GC |
956 | return !!*sk->sk_prot->memory_pressure; |
957 | } | |
958 | ||
959 | static inline void sk_leave_memory_pressure(struct sock *sk) | |
960 | { | |
961 | int *memory_pressure = sk->sk_prot->memory_pressure; | |
962 | ||
e1aab161 GC |
963 | if (!memory_pressure) |
964 | return; | |
965 | ||
966 | if (*memory_pressure) | |
180d8cd9 | 967 | *memory_pressure = 0; |
e1aab161 GC |
968 | |
969 | if (mem_cgroup_sockets_enabled && sk->sk_cgrp) { | |
970 | struct cg_proto *cg_proto = sk->sk_cgrp; | |
971 | struct proto *prot = sk->sk_prot; | |
972 | ||
973 | for (; cg_proto; cg_proto = parent_cg_proto(prot, cg_proto)) | |
974 | if (*cg_proto->memory_pressure) | |
975 | *cg_proto->memory_pressure = 0; | |
976 | } | |
977 | ||
180d8cd9 GC |
978 | } |
979 | ||
980 | static inline void sk_enter_memory_pressure(struct sock *sk) | |
981 | { | |
e1aab161 GC |
982 | if (!sk->sk_prot->enter_memory_pressure) |
983 | return; | |
984 | ||
985 | if (mem_cgroup_sockets_enabled && sk->sk_cgrp) { | |
986 | struct cg_proto *cg_proto = sk->sk_cgrp; | |
987 | struct proto *prot = sk->sk_prot; | |
988 | ||
989 | for (; cg_proto; cg_proto = parent_cg_proto(prot, cg_proto)) | |
990 | cg_proto->enter_memory_pressure(sk); | |
991 | } | |
992 | ||
993 | sk->sk_prot->enter_memory_pressure(sk); | |
180d8cd9 GC |
994 | } |
995 | ||
996 | static inline long sk_prot_mem_limits(const struct sock *sk, int index) | |
997 | { | |
998 | long *prot = sk->sk_prot->sysctl_mem; | |
e1aab161 GC |
999 | if (mem_cgroup_sockets_enabled && sk->sk_cgrp) |
1000 | prot = sk->sk_cgrp->sysctl_mem; | |
180d8cd9 GC |
1001 | return prot[index]; |
1002 | } | |
1003 | ||
e1aab161 GC |
1004 | static inline void memcg_memory_allocated_add(struct cg_proto *prot, |
1005 | unsigned long amt, | |
1006 | int *parent_status) | |
1007 | { | |
1008 | struct res_counter *fail; | |
1009 | int ret; | |
1010 | ||
1011 | ret = res_counter_charge(prot->memory_allocated, | |
1012 | amt << PAGE_SHIFT, &fail); | |
1013 | ||
1014 | if (ret < 0) | |
1015 | *parent_status = OVER_LIMIT; | |
1016 | } | |
1017 | ||
1018 | static inline void memcg_memory_allocated_sub(struct cg_proto *prot, | |
1019 | unsigned long amt) | |
1020 | { | |
1021 | res_counter_uncharge(prot->memory_allocated, amt << PAGE_SHIFT); | |
1022 | } | |
1023 | ||
1024 | static inline u64 memcg_memory_allocated_read(struct cg_proto *prot) | |
1025 | { | |
1026 | u64 ret; | |
1027 | ret = res_counter_read_u64(prot->memory_allocated, RES_USAGE); | |
1028 | return ret >> PAGE_SHIFT; | |
1029 | } | |
1030 | ||
180d8cd9 GC |
1031 | static inline long |
1032 | sk_memory_allocated(const struct sock *sk) | |
1033 | { | |
1034 | struct proto *prot = sk->sk_prot; | |
e1aab161 GC |
1035 | if (mem_cgroup_sockets_enabled && sk->sk_cgrp) |
1036 | return memcg_memory_allocated_read(sk->sk_cgrp); | |
1037 | ||
180d8cd9 GC |
1038 | return atomic_long_read(prot->memory_allocated); |
1039 | } | |
1040 | ||
1041 | static inline long | |
e1aab161 | 1042 | sk_memory_allocated_add(struct sock *sk, int amt, int *parent_status) |
180d8cd9 GC |
1043 | { |
1044 | struct proto *prot = sk->sk_prot; | |
e1aab161 GC |
1045 | |
1046 | if (mem_cgroup_sockets_enabled && sk->sk_cgrp) { | |
1047 | memcg_memory_allocated_add(sk->sk_cgrp, amt, parent_status); | |
1048 | /* update the root cgroup regardless */ | |
1049 | atomic_long_add_return(amt, prot->memory_allocated); | |
1050 | return memcg_memory_allocated_read(sk->sk_cgrp); | |
1051 | } | |
1052 | ||
180d8cd9 GC |
1053 | return atomic_long_add_return(amt, prot->memory_allocated); |
1054 | } | |
1055 | ||
1056 | static inline void | |
e1aab161 | 1057 | sk_memory_allocated_sub(struct sock *sk, int amt, int parent_status) |
180d8cd9 GC |
1058 | { |
1059 | struct proto *prot = sk->sk_prot; | |
e1aab161 GC |
1060 | |
1061 | if (mem_cgroup_sockets_enabled && sk->sk_cgrp && | |
1062 | parent_status != OVER_LIMIT) /* Otherwise was uncharged already */ | |
1063 | memcg_memory_allocated_sub(sk->sk_cgrp, amt); | |
1064 | ||
180d8cd9 GC |
1065 | atomic_long_sub(amt, prot->memory_allocated); |
1066 | } | |
1067 | ||
1068 | static inline void sk_sockets_allocated_dec(struct sock *sk) | |
1069 | { | |
1070 | struct proto *prot = sk->sk_prot; | |
e1aab161 GC |
1071 | |
1072 | if (mem_cgroup_sockets_enabled && sk->sk_cgrp) { | |
1073 | struct cg_proto *cg_proto = sk->sk_cgrp; | |
1074 | ||
1075 | for (; cg_proto; cg_proto = parent_cg_proto(prot, cg_proto)) | |
1076 | percpu_counter_dec(cg_proto->sockets_allocated); | |
1077 | } | |
1078 | ||
180d8cd9 GC |
1079 | percpu_counter_dec(prot->sockets_allocated); |
1080 | } | |
1081 | ||
1082 | static inline void sk_sockets_allocated_inc(struct sock *sk) | |
1083 | { | |
1084 | struct proto *prot = sk->sk_prot; | |
e1aab161 GC |
1085 | |
1086 | if (mem_cgroup_sockets_enabled && sk->sk_cgrp) { | |
1087 | struct cg_proto *cg_proto = sk->sk_cgrp; | |
1088 | ||
1089 | for (; cg_proto; cg_proto = parent_cg_proto(prot, cg_proto)) | |
1090 | percpu_counter_inc(cg_proto->sockets_allocated); | |
1091 | } | |
1092 | ||
180d8cd9 GC |
1093 | percpu_counter_inc(prot->sockets_allocated); |
1094 | } | |
1095 | ||
1096 | static inline int | |
1097 | sk_sockets_allocated_read_positive(struct sock *sk) | |
1098 | { | |
1099 | struct proto *prot = sk->sk_prot; | |
1100 | ||
e1aab161 GC |
1101 | if (mem_cgroup_sockets_enabled && sk->sk_cgrp) |
1102 | return percpu_counter_sum_positive(sk->sk_cgrp->sockets_allocated); | |
1103 | ||
180d8cd9 GC |
1104 | return percpu_counter_sum_positive(prot->sockets_allocated); |
1105 | } | |
1106 | ||
1107 | static inline int | |
1108 | proto_sockets_allocated_sum_positive(struct proto *prot) | |
1109 | { | |
1110 | return percpu_counter_sum_positive(prot->sockets_allocated); | |
1111 | } | |
1112 | ||
1113 | static inline long | |
1114 | proto_memory_allocated(struct proto *prot) | |
1115 | { | |
1116 | return atomic_long_read(prot->memory_allocated); | |
1117 | } | |
1118 | ||
1119 | static inline bool | |
1120 | proto_memory_pressure(struct proto *prot) | |
1121 | { | |
1122 | if (!prot->memory_pressure) | |
1123 | return false; | |
1124 | return !!*prot->memory_pressure; | |
1125 | } | |
1126 | ||
65f76517 ED |
1127 | |
1128 | #ifdef CONFIG_PROC_FS | |
1da177e4 | 1129 | /* Called with local bh disabled */ |
c29a0bc4 PE |
1130 | extern void sock_prot_inuse_add(struct net *net, struct proto *prot, int inc); |
1131 | extern int sock_prot_inuse_get(struct net *net, struct proto *proto); | |
65f76517 | 1132 | #else |
c29a0bc4 PE |
1133 | static void inline sock_prot_inuse_add(struct net *net, struct proto *prot, |
1134 | int inc) | |
65f76517 ED |
1135 | { |
1136 | } | |
65f76517 ED |
1137 | #endif |
1138 | ||
1da177e4 | 1139 | |
614c6cb4 ACM |
1140 | /* With per-bucket locks this operation is not-atomic, so that |
1141 | * this version is not worse. | |
1142 | */ | |
1143 | static inline void __sk_prot_rehash(struct sock *sk) | |
1144 | { | |
1145 | sk->sk_prot->unhash(sk); | |
1146 | sk->sk_prot->hash(sk); | |
1147 | } | |
1148 | ||
fcbdf09d OP |
1149 | void sk_prot_clear_portaddr_nulls(struct sock *sk, int size); |
1150 | ||
1da177e4 LT |
1151 | /* About 10 seconds */ |
1152 | #define SOCK_DESTROY_TIME (10*HZ) | |
1153 | ||
1154 | /* Sockets 0-1023 can't be bound to unless you are superuser */ | |
1155 | #define PROT_SOCK 1024 | |
1156 | ||
1157 | #define SHUTDOWN_MASK 3 | |
1158 | #define RCV_SHUTDOWN 1 | |
1159 | #define SEND_SHUTDOWN 2 | |
1160 | ||
1161 | #define SOCK_SNDBUF_LOCK 1 | |
1162 | #define SOCK_RCVBUF_LOCK 2 | |
1163 | #define SOCK_BINDADDR_LOCK 4 | |
1164 | #define SOCK_BINDPORT_LOCK 8 | |
1165 | ||
1166 | /* sock_iocb: used to kick off async processing of socket ios */ | |
1167 | struct sock_iocb { | |
1168 | struct list_head list; | |
1169 | ||
1170 | int flags; | |
1171 | int size; | |
1172 | struct socket *sock; | |
1173 | struct sock *sk; | |
1174 | struct scm_cookie *scm; | |
1175 | struct msghdr *msg, async_msg; | |
1da177e4 LT |
1176 | struct kiocb *kiocb; |
1177 | }; | |
1178 | ||
1179 | static inline struct sock_iocb *kiocb_to_siocb(struct kiocb *iocb) | |
1180 | { | |
1181 | return (struct sock_iocb *)iocb->private; | |
1182 | } | |
1183 | ||
1184 | static inline struct kiocb *siocb_to_kiocb(struct sock_iocb *si) | |
1185 | { | |
1186 | return si->kiocb; | |
1187 | } | |
1188 | ||
1189 | struct socket_alloc { | |
1190 | struct socket socket; | |
1191 | struct inode vfs_inode; | |
1192 | }; | |
1193 | ||
1194 | static inline struct socket *SOCKET_I(struct inode *inode) | |
1195 | { | |
1196 | return &container_of(inode, struct socket_alloc, vfs_inode)->socket; | |
1197 | } | |
1198 | ||
1199 | static inline struct inode *SOCK_INODE(struct socket *socket) | |
1200 | { | |
1201 | return &container_of(socket, struct socket_alloc, socket)->vfs_inode; | |
1202 | } | |
1203 | ||
3ab224be HA |
1204 | /* |
1205 | * Functions for memory accounting | |
1206 | */ | |
1207 | extern int __sk_mem_schedule(struct sock *sk, int size, int kind); | |
1208 | extern void __sk_mem_reclaim(struct sock *sk); | |
1da177e4 | 1209 | |
3ab224be HA |
1210 | #define SK_MEM_QUANTUM ((int)PAGE_SIZE) |
1211 | #define SK_MEM_QUANTUM_SHIFT ilog2(SK_MEM_QUANTUM) | |
1212 | #define SK_MEM_SEND 0 | |
1213 | #define SK_MEM_RECV 1 | |
1da177e4 | 1214 | |
3ab224be | 1215 | static inline int sk_mem_pages(int amt) |
1da177e4 | 1216 | { |
3ab224be | 1217 | return (amt + SK_MEM_QUANTUM - 1) >> SK_MEM_QUANTUM_SHIFT; |
1da177e4 LT |
1218 | } |
1219 | ||
3ab224be | 1220 | static inline int sk_has_account(struct sock *sk) |
1da177e4 | 1221 | { |
3ab224be HA |
1222 | /* return true if protocol supports memory accounting */ |
1223 | return !!sk->sk_prot->memory_allocated; | |
1da177e4 LT |
1224 | } |
1225 | ||
3ab224be | 1226 | static inline int sk_wmem_schedule(struct sock *sk, int size) |
1da177e4 | 1227 | { |
3ab224be HA |
1228 | if (!sk_has_account(sk)) |
1229 | return 1; | |
1230 | return size <= sk->sk_forward_alloc || | |
1231 | __sk_mem_schedule(sk, size, SK_MEM_SEND); | |
1da177e4 LT |
1232 | } |
1233 | ||
3ab224be | 1234 | static inline int sk_rmem_schedule(struct sock *sk, int size) |
d80d99d6 | 1235 | { |
3ab224be HA |
1236 | if (!sk_has_account(sk)) |
1237 | return 1; | |
d80d99d6 | 1238 | return size <= sk->sk_forward_alloc || |
3ab224be HA |
1239 | __sk_mem_schedule(sk, size, SK_MEM_RECV); |
1240 | } | |
1241 | ||
1242 | static inline void sk_mem_reclaim(struct sock *sk) | |
1243 | { | |
1244 | if (!sk_has_account(sk)) | |
1245 | return; | |
1246 | if (sk->sk_forward_alloc >= SK_MEM_QUANTUM) | |
1247 | __sk_mem_reclaim(sk); | |
1248 | } | |
1249 | ||
9993e7d3 DM |
1250 | static inline void sk_mem_reclaim_partial(struct sock *sk) |
1251 | { | |
1252 | if (!sk_has_account(sk)) | |
1253 | return; | |
1254 | if (sk->sk_forward_alloc > SK_MEM_QUANTUM) | |
1255 | __sk_mem_reclaim(sk); | |
1256 | } | |
1257 | ||
3ab224be HA |
1258 | static inline void sk_mem_charge(struct sock *sk, int size) |
1259 | { | |
1260 | if (!sk_has_account(sk)) | |
1261 | return; | |
1262 | sk->sk_forward_alloc -= size; | |
1263 | } | |
1264 | ||
1265 | static inline void sk_mem_uncharge(struct sock *sk, int size) | |
1266 | { | |
1267 | if (!sk_has_account(sk)) | |
1268 | return; | |
1269 | sk->sk_forward_alloc += size; | |
1270 | } | |
1271 | ||
1272 | static inline void sk_wmem_free_skb(struct sock *sk, struct sk_buff *skb) | |
1273 | { | |
3ab224be HA |
1274 | sock_set_flag(sk, SOCK_QUEUE_SHRUNK); |
1275 | sk->sk_wmem_queued -= skb->truesize; | |
1276 | sk_mem_uncharge(sk, skb->truesize); | |
1277 | __kfree_skb(skb); | |
d80d99d6 HX |
1278 | } |
1279 | ||
1da177e4 LT |
1280 | /* Used by processes to "lock" a socket state, so that |
1281 | * interrupts and bottom half handlers won't change it | |
1282 | * from under us. It essentially blocks any incoming | |
1283 | * packets, so that we won't get any new data or any | |
1284 | * packets that change the state of the socket. | |
1285 | * | |
1286 | * While locked, BH processing will add new packets to | |
1287 | * the backlog queue. This queue is processed by the | |
1288 | * owner of the socket lock right before it is released. | |
1289 | * | |
1290 | * Since ~2.3.5 it is also exclusive sleep lock serializing | |
1291 | * accesses from user process context. | |
1292 | */ | |
d2e9117c | 1293 | #define sock_owned_by_user(sk) ((sk)->sk_lock.owned) |
1da177e4 | 1294 | |
ed07536e PZ |
1295 | /* |
1296 | * Macro so as to not evaluate some arguments when | |
1297 | * lockdep is not enabled. | |
1298 | * | |
1299 | * Mark both the sk_lock and the sk_lock.slock as a | |
1300 | * per-address-family lock class. | |
1301 | */ | |
1302 | #define sock_lock_init_class_and_name(sk, sname, skey, name, key) \ | |
1303 | do { \ | |
e8f6fbf6 | 1304 | sk->sk_lock.owned = 0; \ |
ed07536e PZ |
1305 | init_waitqueue_head(&sk->sk_lock.wq); \ |
1306 | spin_lock_init(&(sk)->sk_lock.slock); \ | |
1307 | debug_check_no_locks_freed((void *)&(sk)->sk_lock, \ | |
1308 | sizeof((sk)->sk_lock)); \ | |
1309 | lockdep_set_class_and_name(&(sk)->sk_lock.slock, \ | |
1310 | (skey), (sname)); \ | |
1311 | lockdep_init_map(&(sk)->sk_lock.dep_map, (name), (key), 0); \ | |
1312 | } while (0) | |
1313 | ||
41380930 | 1314 | extern void lock_sock_nested(struct sock *sk, int subclass); |
fcc70d5f PZ |
1315 | |
1316 | static inline void lock_sock(struct sock *sk) | |
1317 | { | |
1318 | lock_sock_nested(sk, 0); | |
1319 | } | |
1320 | ||
41380930 | 1321 | extern void release_sock(struct sock *sk); |
1da177e4 LT |
1322 | |
1323 | /* BH context may only use the following locking interface. */ | |
1324 | #define bh_lock_sock(__sk) spin_lock(&((__sk)->sk_lock.slock)) | |
c6366184 IM |
1325 | #define bh_lock_sock_nested(__sk) \ |
1326 | spin_lock_nested(&((__sk)->sk_lock.slock), \ | |
1327 | SINGLE_DEPTH_NESTING) | |
1da177e4 LT |
1328 | #define bh_unlock_sock(__sk) spin_unlock(&((__sk)->sk_lock.slock)) |
1329 | ||
8a74ad60 ED |
1330 | extern bool lock_sock_fast(struct sock *sk); |
1331 | /** | |
1332 | * unlock_sock_fast - complement of lock_sock_fast | |
1333 | * @sk: socket | |
1334 | * @slow: slow mode | |
1335 | * | |
1336 | * fast unlock socket for user context. | |
1337 | * If slow mode is on, we call regular release_sock() | |
1338 | */ | |
1339 | static inline void unlock_sock_fast(struct sock *sk, bool slow) | |
4b0b72f7 | 1340 | { |
8a74ad60 ED |
1341 | if (slow) |
1342 | release_sock(sk); | |
1343 | else | |
1344 | spin_unlock_bh(&sk->sk_lock.slock); | |
4b0b72f7 ED |
1345 | } |
1346 | ||
4b0b72f7 | 1347 | |
1b8d7ae4 | 1348 | extern struct sock *sk_alloc(struct net *net, int family, |
dd0fc66f | 1349 | gfp_t priority, |
6257ff21 | 1350 | struct proto *prot); |
1da177e4 | 1351 | extern void sk_free(struct sock *sk); |
edf02087 | 1352 | extern void sk_release_kernel(struct sock *sk); |
e56c57d0 ED |
1353 | extern struct sock *sk_clone_lock(const struct sock *sk, |
1354 | const gfp_t priority); | |
1da177e4 LT |
1355 | |
1356 | extern struct sk_buff *sock_wmalloc(struct sock *sk, | |
1357 | unsigned long size, int force, | |
dd0fc66f | 1358 | gfp_t priority); |
1da177e4 LT |
1359 | extern struct sk_buff *sock_rmalloc(struct sock *sk, |
1360 | unsigned long size, int force, | |
dd0fc66f | 1361 | gfp_t priority); |
1da177e4 LT |
1362 | extern void sock_wfree(struct sk_buff *skb); |
1363 | extern void sock_rfree(struct sk_buff *skb); | |
1364 | ||
1365 | extern int sock_setsockopt(struct socket *sock, int level, | |
1366 | int op, char __user *optval, | |
b7058842 | 1367 | unsigned int optlen); |
1da177e4 LT |
1368 | |
1369 | extern int sock_getsockopt(struct socket *sock, int level, | |
1370 | int op, char __user *optval, | |
1371 | int __user *optlen); | |
1372 | extern struct sk_buff *sock_alloc_send_skb(struct sock *sk, | |
1373 | unsigned long size, | |
1374 | int noblock, | |
1375 | int *errcode); | |
4cc7f68d HX |
1376 | extern struct sk_buff *sock_alloc_send_pskb(struct sock *sk, |
1377 | unsigned long header_len, | |
1378 | unsigned long data_len, | |
1379 | int noblock, | |
1380 | int *errcode); | |
86a76caf | 1381 | extern void *sock_kmalloc(struct sock *sk, int size, |
dd0fc66f | 1382 | gfp_t priority); |
1da177e4 LT |
1383 | extern void sock_kfree_s(struct sock *sk, void *mem, int size); |
1384 | extern void sk_send_sigurg(struct sock *sk); | |
1385 | ||
f8451725 HX |
1386 | #ifdef CONFIG_CGROUPS |
1387 | extern void sock_update_classid(struct sock *sk); | |
1388 | #else | |
1389 | static inline void sock_update_classid(struct sock *sk) | |
1390 | { | |
1391 | } | |
1392 | #endif | |
1393 | ||
1da177e4 LT |
1394 | /* |
1395 | * Functions to fill in entries in struct proto_ops when a protocol | |
1396 | * does not implement a particular function. | |
1397 | */ | |
1398 | extern int sock_no_bind(struct socket *, | |
1399 | struct sockaddr *, int); | |
1400 | extern int sock_no_connect(struct socket *, | |
1401 | struct sockaddr *, int, int); | |
1402 | extern int sock_no_socketpair(struct socket *, | |
1403 | struct socket *); | |
1404 | extern int sock_no_accept(struct socket *, | |
1405 | struct socket *, int); | |
1406 | extern int sock_no_getname(struct socket *, | |
1407 | struct sockaddr *, int *, int); | |
1408 | extern unsigned int sock_no_poll(struct file *, struct socket *, | |
1409 | struct poll_table_struct *); | |
1410 | extern int sock_no_ioctl(struct socket *, unsigned int, | |
1411 | unsigned long); | |
1412 | extern int sock_no_listen(struct socket *, int); | |
1413 | extern int sock_no_shutdown(struct socket *, int); | |
1414 | extern int sock_no_getsockopt(struct socket *, int , int, | |
1415 | char __user *, int __user *); | |
1416 | extern int sock_no_setsockopt(struct socket *, int, int, | |
b7058842 | 1417 | char __user *, unsigned int); |
1da177e4 LT |
1418 | extern int sock_no_sendmsg(struct kiocb *, struct socket *, |
1419 | struct msghdr *, size_t); | |
1420 | extern int sock_no_recvmsg(struct kiocb *, struct socket *, | |
1421 | struct msghdr *, size_t, int); | |
1422 | extern int sock_no_mmap(struct file *file, | |
1423 | struct socket *sock, | |
1424 | struct vm_area_struct *vma); | |
1425 | extern ssize_t sock_no_sendpage(struct socket *sock, | |
1426 | struct page *page, | |
1427 | int offset, size_t size, | |
1428 | int flags); | |
1429 | ||
1430 | /* | |
1431 | * Functions to fill in entries in struct proto_ops when a protocol | |
1432 | * uses the inet style. | |
1433 | */ | |
1434 | extern int sock_common_getsockopt(struct socket *sock, int level, int optname, | |
1435 | char __user *optval, int __user *optlen); | |
1436 | extern int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock, | |
1437 | struct msghdr *msg, size_t size, int flags); | |
1438 | extern int sock_common_setsockopt(struct socket *sock, int level, int optname, | |
b7058842 | 1439 | char __user *optval, unsigned int optlen); |
3fdadf7d DM |
1440 | extern int compat_sock_common_getsockopt(struct socket *sock, int level, |
1441 | int optname, char __user *optval, int __user *optlen); | |
1442 | extern int compat_sock_common_setsockopt(struct socket *sock, int level, | |
b7058842 | 1443 | int optname, char __user *optval, unsigned int optlen); |
1da177e4 LT |
1444 | |
1445 | extern void sk_common_release(struct sock *sk); | |
1446 | ||
1447 | /* | |
1448 | * Default socket callbacks and setup code | |
1449 | */ | |
1450 | ||
1451 | /* Initialise core socket variables */ | |
1452 | extern void sock_init_data(struct socket *sock, struct sock *sk); | |
1453 | ||
46bcf14f ED |
1454 | extern void sk_filter_release_rcu(struct rcu_head *rcu); |
1455 | ||
dc9b3346 | 1456 | /** |
1a5778aa | 1457 | * sk_filter_release - release a socket filter |
dc9b3346 PB |
1458 | * @fp: filter to remove |
1459 | * | |
1460 | * Remove a filter from a socket and release its resources. | |
1461 | */ | |
1462 | ||
309dd5fc PE |
1463 | static inline void sk_filter_release(struct sk_filter *fp) |
1464 | { | |
1465 | if (atomic_dec_and_test(&fp->refcnt)) | |
80f8f102 | 1466 | call_rcu(&fp->rcu, sk_filter_release_rcu); |
309dd5fc PE |
1467 | } |
1468 | ||
1469 | static inline void sk_filter_uncharge(struct sock *sk, struct sk_filter *fp) | |
1da177e4 LT |
1470 | { |
1471 | unsigned int size = sk_filter_len(fp); | |
1472 | ||
1473 | atomic_sub(size, &sk->sk_omem_alloc); | |
309dd5fc | 1474 | sk_filter_release(fp); |
1da177e4 LT |
1475 | } |
1476 | ||
1477 | static inline void sk_filter_charge(struct sock *sk, struct sk_filter *fp) | |
1478 | { | |
1479 | atomic_inc(&fp->refcnt); | |
1480 | atomic_add(sk_filter_len(fp), &sk->sk_omem_alloc); | |
1481 | } | |
1482 | ||
1483 | /* | |
1484 | * Socket reference counting postulates. | |
1485 | * | |
1486 | * * Each user of socket SHOULD hold a reference count. | |
1487 | * * Each access point to socket (an hash table bucket, reference from a list, | |
1488 | * running timer, skb in flight MUST hold a reference count. | |
1489 | * * When reference count hits 0, it means it will never increase back. | |
1490 | * * When reference count hits 0, it means that no references from | |
1491 | * outside exist to this socket and current process on current CPU | |
1492 | * is last user and may/should destroy this socket. | |
1493 | * * sk_free is called from any context: process, BH, IRQ. When | |
1494 | * it is called, socket has no references from outside -> sk_free | |
1495 | * may release descendant resources allocated by the socket, but | |
1496 | * to the time when it is called, socket is NOT referenced by any | |
1497 | * hash tables, lists etc. | |
1498 | * * Packets, delivered from outside (from network or from another process) | |
1499 | * and enqueued on receive/error queues SHOULD NOT grab reference count, | |
1500 | * when they sit in queue. Otherwise, packets will leak to hole, when | |
1501 | * socket is looked up by one cpu and unhasing is made by another CPU. | |
1502 | * It is true for udp/raw, netlink (leak to receive and error queues), tcp | |
1503 | * (leak to backlog). Packet socket does all the processing inside | |
1504 | * BR_NETPROTO_LOCK, so that it has not this race condition. UNIX sockets | |
1505 | * use separate SMP lock, so that they are prone too. | |
1506 | */ | |
1507 | ||
1508 | /* Ungrab socket and destroy it, if it was the last reference. */ | |
1509 | static inline void sock_put(struct sock *sk) | |
1510 | { | |
1511 | if (atomic_dec_and_test(&sk->sk_refcnt)) | |
1512 | sk_free(sk); | |
1513 | } | |
1514 | ||
58a5a7b9 ACM |
1515 | extern int sk_receive_skb(struct sock *sk, struct sk_buff *skb, |
1516 | const int nested); | |
25995ff5 | 1517 | |
e022f0b4 KK |
1518 | static inline void sk_tx_queue_set(struct sock *sk, int tx_queue) |
1519 | { | |
1520 | sk->sk_tx_queue_mapping = tx_queue; | |
1521 | } | |
1522 | ||
1523 | static inline void sk_tx_queue_clear(struct sock *sk) | |
1524 | { | |
1525 | sk->sk_tx_queue_mapping = -1; | |
1526 | } | |
1527 | ||
1528 | static inline int sk_tx_queue_get(const struct sock *sk) | |
1529 | { | |
b0f77d0e | 1530 | return sk ? sk->sk_tx_queue_mapping : -1; |
e022f0b4 KK |
1531 | } |
1532 | ||
972692e0 DM |
1533 | static inline void sk_set_socket(struct sock *sk, struct socket *sock) |
1534 | { | |
e022f0b4 | 1535 | sk_tx_queue_clear(sk); |
972692e0 DM |
1536 | sk->sk_socket = sock; |
1537 | } | |
1538 | ||
aa395145 ED |
1539 | static inline wait_queue_head_t *sk_sleep(struct sock *sk) |
1540 | { | |
eaefd110 ED |
1541 | BUILD_BUG_ON(offsetof(struct socket_wq, wait) != 0); |
1542 | return &rcu_dereference_raw(sk->sk_wq)->wait; | |
aa395145 | 1543 | } |
1da177e4 LT |
1544 | /* Detach socket from process context. |
1545 | * Announce socket dead, detach it from wait queue and inode. | |
1546 | * Note that parent inode held reference count on this struct sock, | |
1547 | * we do not release it in this function, because protocol | |
1548 | * probably wants some additional cleanups or even continuing | |
1549 | * to work with this socket (TCP). | |
1550 | */ | |
1551 | static inline void sock_orphan(struct sock *sk) | |
1552 | { | |
1553 | write_lock_bh(&sk->sk_callback_lock); | |
1554 | sock_set_flag(sk, SOCK_DEAD); | |
972692e0 | 1555 | sk_set_socket(sk, NULL); |
43815482 | 1556 | sk->sk_wq = NULL; |
1da177e4 LT |
1557 | write_unlock_bh(&sk->sk_callback_lock); |
1558 | } | |
1559 | ||
1560 | static inline void sock_graft(struct sock *sk, struct socket *parent) | |
1561 | { | |
1562 | write_lock_bh(&sk->sk_callback_lock); | |
eaefd110 | 1563 | sk->sk_wq = parent->wq; |
1da177e4 | 1564 | parent->sk = sk; |
972692e0 | 1565 | sk_set_socket(sk, parent); |
4237c75c | 1566 | security_sock_graft(sk, parent); |
1da177e4 LT |
1567 | write_unlock_bh(&sk->sk_callback_lock); |
1568 | } | |
1569 | ||
1570 | extern int sock_i_uid(struct sock *sk); | |
1571 | extern unsigned long sock_i_ino(struct sock *sk); | |
1572 | ||
1573 | static inline struct dst_entry * | |
1574 | __sk_dst_get(struct sock *sk) | |
1575 | { | |
d8bf4ca9 | 1576 | return rcu_dereference_check(sk->sk_dst_cache, sock_owned_by_user(sk) || |
f68c224f | 1577 | lockdep_is_held(&sk->sk_lock.slock)); |
1da177e4 LT |
1578 | } |
1579 | ||
1580 | static inline struct dst_entry * | |
1581 | sk_dst_get(struct sock *sk) | |
1582 | { | |
1583 | struct dst_entry *dst; | |
1584 | ||
b6c6712a ED |
1585 | rcu_read_lock(); |
1586 | dst = rcu_dereference(sk->sk_dst_cache); | |
1da177e4 LT |
1587 | if (dst) |
1588 | dst_hold(dst); | |
b6c6712a | 1589 | rcu_read_unlock(); |
1da177e4 LT |
1590 | return dst; |
1591 | } | |
1592 | ||
b6c6712a ED |
1593 | extern void sk_reset_txq(struct sock *sk); |
1594 | ||
1595 | static inline void dst_negative_advice(struct sock *sk) | |
1596 | { | |
1597 | struct dst_entry *ndst, *dst = __sk_dst_get(sk); | |
1598 | ||
1599 | if (dst && dst->ops->negative_advice) { | |
1600 | ndst = dst->ops->negative_advice(dst); | |
1601 | ||
1602 | if (ndst != dst) { | |
1603 | rcu_assign_pointer(sk->sk_dst_cache, ndst); | |
1604 | sk_reset_txq(sk); | |
1605 | } | |
1606 | } | |
1607 | } | |
1608 | ||
1da177e4 LT |
1609 | static inline void |
1610 | __sk_dst_set(struct sock *sk, struct dst_entry *dst) | |
1611 | { | |
1612 | struct dst_entry *old_dst; | |
1613 | ||
e022f0b4 | 1614 | sk_tx_queue_clear(sk); |
0b53ff2e ED |
1615 | /* |
1616 | * This can be called while sk is owned by the caller only, | |
1617 | * with no state that can be checked in a rcu_dereference_check() cond | |
1618 | */ | |
1619 | old_dst = rcu_dereference_raw(sk->sk_dst_cache); | |
b6c6712a | 1620 | rcu_assign_pointer(sk->sk_dst_cache, dst); |
1da177e4 LT |
1621 | dst_release(old_dst); |
1622 | } | |
1623 | ||
1624 | static inline void | |
1625 | sk_dst_set(struct sock *sk, struct dst_entry *dst) | |
1626 | { | |
b6c6712a | 1627 | spin_lock(&sk->sk_dst_lock); |
1da177e4 | 1628 | __sk_dst_set(sk, dst); |
b6c6712a | 1629 | spin_unlock(&sk->sk_dst_lock); |
1da177e4 LT |
1630 | } |
1631 | ||
1632 | static inline void | |
1633 | __sk_dst_reset(struct sock *sk) | |
1634 | { | |
b6c6712a | 1635 | __sk_dst_set(sk, NULL); |
1da177e4 LT |
1636 | } |
1637 | ||
1638 | static inline void | |
1639 | sk_dst_reset(struct sock *sk) | |
1640 | { | |
b6c6712a | 1641 | spin_lock(&sk->sk_dst_lock); |
1da177e4 | 1642 | __sk_dst_reset(sk); |
b6c6712a | 1643 | spin_unlock(&sk->sk_dst_lock); |
1da177e4 LT |
1644 | } |
1645 | ||
f0088a50 | 1646 | extern struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie); |
1da177e4 | 1647 | |
f0088a50 | 1648 | extern struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie); |
1da177e4 | 1649 | |
bcd76111 HX |
1650 | static inline int sk_can_gso(const struct sock *sk) |
1651 | { | |
1652 | return net_gso_ok(sk->sk_route_caps, sk->sk_gso_type); | |
1653 | } | |
1654 | ||
9958089a | 1655 | extern void sk_setup_caps(struct sock *sk, struct dst_entry *dst); |
6cbb0df7 | 1656 | |
c8f44aff | 1657 | static inline void sk_nocaps_add(struct sock *sk, netdev_features_t flags) |
a465419b ED |
1658 | { |
1659 | sk->sk_route_nocaps |= flags; | |
1660 | sk->sk_route_caps &= ~flags; | |
1661 | } | |
1662 | ||
c6e1a0d1 TH |
1663 | static inline int skb_do_copy_data_nocache(struct sock *sk, struct sk_buff *skb, |
1664 | char __user *from, char *to, | |
912d398d | 1665 | int copy, int offset) |
c6e1a0d1 TH |
1666 | { |
1667 | if (skb->ip_summed == CHECKSUM_NONE) { | |
1668 | int err = 0; | |
1669 | __wsum csum = csum_and_copy_from_user(from, to, copy, 0, &err); | |
1670 | if (err) | |
1671 | return err; | |
912d398d | 1672 | skb->csum = csum_block_add(skb->csum, csum, offset); |
c6e1a0d1 TH |
1673 | } else if (sk->sk_route_caps & NETIF_F_NOCACHE_COPY) { |
1674 | if (!access_ok(VERIFY_READ, from, copy) || | |
1675 | __copy_from_user_nocache(to, from, copy)) | |
1676 | return -EFAULT; | |
1677 | } else if (copy_from_user(to, from, copy)) | |
1678 | return -EFAULT; | |
1679 | ||
1680 | return 0; | |
1681 | } | |
1682 | ||
1683 | static inline int skb_add_data_nocache(struct sock *sk, struct sk_buff *skb, | |
1684 | char __user *from, int copy) | |
1685 | { | |
912d398d | 1686 | int err, offset = skb->len; |
c6e1a0d1 | 1687 | |
912d398d WY |
1688 | err = skb_do_copy_data_nocache(sk, skb, from, skb_put(skb, copy), |
1689 | copy, offset); | |
c6e1a0d1 | 1690 | if (err) |
912d398d | 1691 | __skb_trim(skb, offset); |
c6e1a0d1 TH |
1692 | |
1693 | return err; | |
1694 | } | |
1695 | ||
1696 | static inline int skb_copy_to_page_nocache(struct sock *sk, char __user *from, | |
1697 | struct sk_buff *skb, | |
1698 | struct page *page, | |
1699 | int off, int copy) | |
1700 | { | |
1701 | int err; | |
1702 | ||
912d398d WY |
1703 | err = skb_do_copy_data_nocache(sk, skb, from, page_address(page) + off, |
1704 | copy, skb->len); | |
c6e1a0d1 TH |
1705 | if (err) |
1706 | return err; | |
1707 | ||
1708 | skb->len += copy; | |
1709 | skb->data_len += copy; | |
1710 | skb->truesize += copy; | |
1711 | sk->sk_wmem_queued += copy; | |
1712 | sk_mem_charge(sk, copy); | |
1713 | return 0; | |
1714 | } | |
1715 | ||
1da177e4 LT |
1716 | static inline int skb_copy_to_page(struct sock *sk, char __user *from, |
1717 | struct sk_buff *skb, struct page *page, | |
1718 | int off, int copy) | |
1719 | { | |
1720 | if (skb->ip_summed == CHECKSUM_NONE) { | |
1721 | int err = 0; | |
5084205f | 1722 | __wsum csum = csum_and_copy_from_user(from, |
1da177e4 LT |
1723 | page_address(page) + off, |
1724 | copy, 0, &err); | |
1725 | if (err) | |
1726 | return err; | |
1727 | skb->csum = csum_block_add(skb->csum, csum, skb->len); | |
1728 | } else if (copy_from_user(page_address(page) + off, from, copy)) | |
1729 | return -EFAULT; | |
1730 | ||
1731 | skb->len += copy; | |
1732 | skb->data_len += copy; | |
1733 | skb->truesize += copy; | |
1734 | sk->sk_wmem_queued += copy; | |
3ab224be | 1735 | sk_mem_charge(sk, copy); |
1da177e4 LT |
1736 | return 0; |
1737 | } | |
1738 | ||
c564039f ED |
1739 | /** |
1740 | * sk_wmem_alloc_get - returns write allocations | |
1741 | * @sk: socket | |
1742 | * | |
1743 | * Returns sk_wmem_alloc minus initial offset of one | |
1744 | */ | |
1745 | static inline int sk_wmem_alloc_get(const struct sock *sk) | |
1746 | { | |
1747 | return atomic_read(&sk->sk_wmem_alloc) - 1; | |
1748 | } | |
1749 | ||
1750 | /** | |
1751 | * sk_rmem_alloc_get - returns read allocations | |
1752 | * @sk: socket | |
1753 | * | |
1754 | * Returns sk_rmem_alloc | |
1755 | */ | |
1756 | static inline int sk_rmem_alloc_get(const struct sock *sk) | |
1757 | { | |
1758 | return atomic_read(&sk->sk_rmem_alloc); | |
1759 | } | |
1760 | ||
1761 | /** | |
1762 | * sk_has_allocations - check if allocations are outstanding | |
1763 | * @sk: socket | |
1764 | * | |
1765 | * Returns true if socket has write or read allocations | |
1766 | */ | |
1767 | static inline int sk_has_allocations(const struct sock *sk) | |
1768 | { | |
1769 | return sk_wmem_alloc_get(sk) || sk_rmem_alloc_get(sk); | |
1770 | } | |
1771 | ||
a57de0b4 | 1772 | /** |
43815482 | 1773 | * wq_has_sleeper - check if there are any waiting processes |
acfbe96a | 1774 | * @wq: struct socket_wq |
a57de0b4 | 1775 | * |
43815482 | 1776 | * Returns true if socket_wq has waiting processes |
a57de0b4 | 1777 | * |
43815482 | 1778 | * The purpose of the wq_has_sleeper and sock_poll_wait is to wrap the memory |
a57de0b4 JO |
1779 | * barrier call. They were added due to the race found within the tcp code. |
1780 | * | |
1781 | * Consider following tcp code paths: | |
1782 | * | |
1783 | * CPU1 CPU2 | |
1784 | * | |
1785 | * sys_select receive packet | |
1786 | * ... ... | |
1787 | * __add_wait_queue update tp->rcv_nxt | |
1788 | * ... ... | |
1789 | * tp->rcv_nxt check sock_def_readable | |
1790 | * ... { | |
43815482 ED |
1791 | * schedule rcu_read_lock(); |
1792 | * wq = rcu_dereference(sk->sk_wq); | |
1793 | * if (wq && waitqueue_active(&wq->wait)) | |
1794 | * wake_up_interruptible(&wq->wait) | |
a57de0b4 JO |
1795 | * ... |
1796 | * } | |
1797 | * | |
1798 | * The race for tcp fires when the __add_wait_queue changes done by CPU1 stay | |
1799 | * in its cache, and so does the tp->rcv_nxt update on CPU2 side. The CPU1 | |
1800 | * could then endup calling schedule and sleep forever if there are no more | |
1801 | * data on the socket. | |
ad462769 | 1802 | * |
a57de0b4 | 1803 | */ |
43815482 | 1804 | static inline bool wq_has_sleeper(struct socket_wq *wq) |
a57de0b4 | 1805 | { |
43815482 | 1806 | |
a57de0b4 JO |
1807 | /* |
1808 | * We need to be sure we are in sync with the | |
1809 | * add_wait_queue modifications to the wait queue. | |
1810 | * | |
1811 | * This memory barrier is paired in the sock_poll_wait. | |
1812 | */ | |
43815482 ED |
1813 | smp_mb(); |
1814 | return wq && waitqueue_active(&wq->wait); | |
a57de0b4 JO |
1815 | } |
1816 | ||
1817 | /** | |
1818 | * sock_poll_wait - place memory barrier behind the poll_wait call. | |
1819 | * @filp: file | |
1820 | * @wait_address: socket wait queue | |
1821 | * @p: poll_table | |
1822 | * | |
43815482 | 1823 | * See the comments in the wq_has_sleeper function. |
a57de0b4 JO |
1824 | */ |
1825 | static inline void sock_poll_wait(struct file *filp, | |
1826 | wait_queue_head_t *wait_address, poll_table *p) | |
1827 | { | |
1828 | if (p && wait_address) { | |
1829 | poll_wait(filp, wait_address, p); | |
1830 | /* | |
1831 | * We need to be sure we are in sync with the | |
1832 | * socket flags modification. | |
1833 | * | |
43815482 | 1834 | * This memory barrier is paired in the wq_has_sleeper. |
a57de0b4 JO |
1835 | */ |
1836 | smp_mb(); | |
1837 | } | |
1838 | } | |
1839 | ||
1da177e4 LT |
1840 | /* |
1841 | * Queue a received datagram if it will fit. Stream and sequenced | |
1842 | * protocols can't normally use this as they need to fit buffers in | |
1843 | * and play with them. | |
1844 | * | |
1845 | * Inlined as it's very short and called for pretty much every | |
1846 | * packet ever received. | |
1847 | */ | |
1848 | ||
1849 | static inline void skb_set_owner_w(struct sk_buff *skb, struct sock *sk) | |
1850 | { | |
d55d87fd | 1851 | skb_orphan(skb); |
1da177e4 LT |
1852 | skb->sk = sk; |
1853 | skb->destructor = sock_wfree; | |
2b85a34e ED |
1854 | /* |
1855 | * We used to take a refcount on sk, but following operation | |
1856 | * is enough to guarantee sk_free() wont free this sock until | |
1857 | * all in-flight packets are completed | |
1858 | */ | |
1da177e4 LT |
1859 | atomic_add(skb->truesize, &sk->sk_wmem_alloc); |
1860 | } | |
1861 | ||
1862 | static inline void skb_set_owner_r(struct sk_buff *skb, struct sock *sk) | |
1863 | { | |
d55d87fd | 1864 | skb_orphan(skb); |
1da177e4 LT |
1865 | skb->sk = sk; |
1866 | skb->destructor = sock_rfree; | |
1867 | atomic_add(skb->truesize, &sk->sk_rmem_alloc); | |
3ab224be | 1868 | sk_mem_charge(sk, skb->truesize); |
1da177e4 LT |
1869 | } |
1870 | ||
1871 | extern void sk_reset_timer(struct sock *sk, struct timer_list* timer, | |
1872 | unsigned long expires); | |
1873 | ||
1874 | extern void sk_stop_timer(struct sock *sk, struct timer_list* timer); | |
1875 | ||
f0088a50 | 1876 | extern int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb); |
1da177e4 | 1877 | |
b1faf566 | 1878 | extern int sock_queue_err_skb(struct sock *sk, struct sk_buff *skb); |
1da177e4 LT |
1879 | |
1880 | /* | |
1881 | * Recover an error report and clear atomically | |
1882 | */ | |
1883 | ||
1884 | static inline int sock_error(struct sock *sk) | |
1885 | { | |
c1cbe4b7 BL |
1886 | int err; |
1887 | if (likely(!sk->sk_err)) | |
1888 | return 0; | |
1889 | err = xchg(&sk->sk_err, 0); | |
1da177e4 LT |
1890 | return -err; |
1891 | } | |
1892 | ||
1893 | static inline unsigned long sock_wspace(struct sock *sk) | |
1894 | { | |
1895 | int amt = 0; | |
1896 | ||
1897 | if (!(sk->sk_shutdown & SEND_SHUTDOWN)) { | |
1898 | amt = sk->sk_sndbuf - atomic_read(&sk->sk_wmem_alloc); | |
1899 | if (amt < 0) | |
1900 | amt = 0; | |
1901 | } | |
1902 | return amt; | |
1903 | } | |
1904 | ||
1905 | static inline void sk_wake_async(struct sock *sk, int how, int band) | |
1906 | { | |
bcdce719 | 1907 | if (sock_flag(sk, SOCK_FASYNC)) |
1da177e4 LT |
1908 | sock_wake_async(sk->sk_socket, how, band); |
1909 | } | |
1910 | ||
1911 | #define SOCK_MIN_SNDBUF 2048 | |
7a91b434 ED |
1912 | /* |
1913 | * Since sk_rmem_alloc sums skb->truesize, even a small frame might need | |
1914 | * sizeof(sk_buff) + MTU + padding, unless net driver perform copybreak | |
1915 | */ | |
1916 | #define SOCK_MIN_RCVBUF (2048 + sizeof(struct sk_buff)) | |
1da177e4 LT |
1917 | |
1918 | static inline void sk_stream_moderate_sndbuf(struct sock *sk) | |
1919 | { | |
1920 | if (!(sk->sk_userlocks & SOCK_SNDBUF_LOCK)) { | |
8df09ea3 | 1921 | sk->sk_sndbuf = min(sk->sk_sndbuf, sk->sk_wmem_queued >> 1); |
1da177e4 LT |
1922 | sk->sk_sndbuf = max(sk->sk_sndbuf, SOCK_MIN_SNDBUF); |
1923 | } | |
1924 | } | |
1925 | ||
df97c708 | 1926 | struct sk_buff *sk_stream_alloc_skb(struct sock *sk, int size, gfp_t gfp); |
1da177e4 LT |
1927 | |
1928 | static inline struct page *sk_stream_alloc_page(struct sock *sk) | |
1929 | { | |
1930 | struct page *page = NULL; | |
1931 | ||
ef015786 HX |
1932 | page = alloc_pages(sk->sk_allocation, 0); |
1933 | if (!page) { | |
180d8cd9 | 1934 | sk_enter_memory_pressure(sk); |
1da177e4 LT |
1935 | sk_stream_moderate_sndbuf(sk); |
1936 | } | |
1937 | return page; | |
1938 | } | |
1939 | ||
1da177e4 LT |
1940 | /* |
1941 | * Default write policy as shown to user space via poll/select/SIGIO | |
1942 | */ | |
1943 | static inline int sock_writeable(const struct sock *sk) | |
1944 | { | |
8df09ea3 | 1945 | return atomic_read(&sk->sk_wmem_alloc) < (sk->sk_sndbuf >> 1); |
1da177e4 LT |
1946 | } |
1947 | ||
dd0fc66f | 1948 | static inline gfp_t gfp_any(void) |
1da177e4 | 1949 | { |
99709372 | 1950 | return in_softirq() ? GFP_ATOMIC : GFP_KERNEL; |
1da177e4 LT |
1951 | } |
1952 | ||
1953 | static inline long sock_rcvtimeo(const struct sock *sk, int noblock) | |
1954 | { | |
1955 | return noblock ? 0 : sk->sk_rcvtimeo; | |
1956 | } | |
1957 | ||
1958 | static inline long sock_sndtimeo(const struct sock *sk, int noblock) | |
1959 | { | |
1960 | return noblock ? 0 : sk->sk_sndtimeo; | |
1961 | } | |
1962 | ||
1963 | static inline int sock_rcvlowat(const struct sock *sk, int waitall, int len) | |
1964 | { | |
1965 | return (waitall ? len : min_t(int, sk->sk_rcvlowat, len)) ? : 1; | |
1966 | } | |
1967 | ||
1968 | /* Alas, with timeout socket operations are not restartable. | |
1969 | * Compare this to poll(). | |
1970 | */ | |
1971 | static inline int sock_intr_errno(long timeo) | |
1972 | { | |
1973 | return timeo == MAX_SCHEDULE_TIMEOUT ? -ERESTARTSYS : -EINTR; | |
1974 | } | |
1975 | ||
92f37fd2 ED |
1976 | extern void __sock_recv_timestamp(struct msghdr *msg, struct sock *sk, |
1977 | struct sk_buff *skb); | |
6e3e939f JB |
1978 | extern void __sock_recv_wifi_status(struct msghdr *msg, struct sock *sk, |
1979 | struct sk_buff *skb); | |
92f37fd2 | 1980 | |
1da177e4 LT |
1981 | static __inline__ void |
1982 | sock_recv_timestamp(struct msghdr *msg, struct sock *sk, struct sk_buff *skb) | |
1983 | { | |
b7aa0bf7 | 1984 | ktime_t kt = skb->tstamp; |
20d49473 | 1985 | struct skb_shared_hwtstamps *hwtstamps = skb_hwtstamps(skb); |
a61bbcf2 | 1986 | |
20d49473 PO |
1987 | /* |
1988 | * generate control messages if | |
1989 | * - receive time stamping in software requested (SOCK_RCVTSTAMP | |
1990 | * or SOCK_TIMESTAMPING_RX_SOFTWARE) | |
1991 | * - software time stamp available and wanted | |
1992 | * (SOCK_TIMESTAMPING_SOFTWARE) | |
1993 | * - hardware time stamps available and wanted | |
1994 | * (SOCK_TIMESTAMPING_SYS_HARDWARE or | |
1995 | * SOCK_TIMESTAMPING_RAW_HARDWARE) | |
1996 | */ | |
1997 | if (sock_flag(sk, SOCK_RCVTSTAMP) || | |
1998 | sock_flag(sk, SOCK_TIMESTAMPING_RX_SOFTWARE) || | |
1999 | (kt.tv64 && sock_flag(sk, SOCK_TIMESTAMPING_SOFTWARE)) || | |
2000 | (hwtstamps->hwtstamp.tv64 && | |
2001 | sock_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE)) || | |
2002 | (hwtstamps->syststamp.tv64 && | |
2003 | sock_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE))) | |
92f37fd2 ED |
2004 | __sock_recv_timestamp(msg, sk, skb); |
2005 | else | |
b7aa0bf7 | 2006 | sk->sk_stamp = kt; |
6e3e939f JB |
2007 | |
2008 | if (sock_flag(sk, SOCK_WIFI_STATUS) && skb->wifi_acked_valid) | |
2009 | __sock_recv_wifi_status(msg, sk, skb); | |
1da177e4 LT |
2010 | } |
2011 | ||
767dd033 ED |
2012 | extern void __sock_recv_ts_and_drops(struct msghdr *msg, struct sock *sk, |
2013 | struct sk_buff *skb); | |
2014 | ||
2015 | static inline void sock_recv_ts_and_drops(struct msghdr *msg, struct sock *sk, | |
2016 | struct sk_buff *skb) | |
2017 | { | |
2018 | #define FLAGS_TS_OR_DROPS ((1UL << SOCK_RXQ_OVFL) | \ | |
2019 | (1UL << SOCK_RCVTSTAMP) | \ | |
2020 | (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE) | \ | |
2021 | (1UL << SOCK_TIMESTAMPING_SOFTWARE) | \ | |
2022 | (1UL << SOCK_TIMESTAMPING_RAW_HARDWARE) | \ | |
2023 | (1UL << SOCK_TIMESTAMPING_SYS_HARDWARE)) | |
2024 | ||
2025 | if (sk->sk_flags & FLAGS_TS_OR_DROPS) | |
2026 | __sock_recv_ts_and_drops(msg, sk, skb); | |
2027 | else | |
2028 | sk->sk_stamp = skb->tstamp; | |
2029 | } | |
3b885787 | 2030 | |
20d49473 PO |
2031 | /** |
2032 | * sock_tx_timestamp - checks whether the outgoing packet is to be time stamped | |
20d49473 | 2033 | * @sk: socket sending this packet |
2244d07b | 2034 | * @tx_flags: filled with instructions for time stamping |
20d49473 PO |
2035 | * |
2036 | * Currently only depends on SOCK_TIMESTAMPING* flags. Returns error code if | |
2037 | * parameters are invalid. | |
2038 | */ | |
2244d07b | 2039 | extern int sock_tx_timestamp(struct sock *sk, __u8 *tx_flags); |
20d49473 | 2040 | |
1da177e4 LT |
2041 | /** |
2042 | * sk_eat_skb - Release a skb if it is no longer needed | |
4dc3b16b PP |
2043 | * @sk: socket to eat this skb from |
2044 | * @skb: socket buffer to eat | |
f4b8ea78 | 2045 | * @copied_early: flag indicating whether DMA operations copied this data early |
1da177e4 LT |
2046 | * |
2047 | * This routine must be called with interrupts disabled or with the socket | |
2048 | * locked so that the sk_buff queue operation is ok. | |
2049 | */ | |
624d1164 CL |
2050 | #ifdef CONFIG_NET_DMA |
2051 | static inline void sk_eat_skb(struct sock *sk, struct sk_buff *skb, int copied_early) | |
2052 | { | |
2053 | __skb_unlink(skb, &sk->sk_receive_queue); | |
2054 | if (!copied_early) | |
2055 | __kfree_skb(skb); | |
2056 | else | |
2057 | __skb_queue_tail(&sk->sk_async_wait_queue, skb); | |
2058 | } | |
2059 | #else | |
2060 | static inline void sk_eat_skb(struct sock *sk, struct sk_buff *skb, int copied_early) | |
1da177e4 LT |
2061 | { |
2062 | __skb_unlink(skb, &sk->sk_receive_queue); | |
2063 | __kfree_skb(skb); | |
2064 | } | |
624d1164 | 2065 | #endif |
1da177e4 | 2066 | |
3b1e0a65 YH |
2067 | static inline |
2068 | struct net *sock_net(const struct sock *sk) | |
2069 | { | |
c2d9ba9b | 2070 | return read_pnet(&sk->sk_net); |
3b1e0a65 YH |
2071 | } |
2072 | ||
2073 | static inline | |
f5aa23fd | 2074 | void sock_net_set(struct sock *sk, struct net *net) |
3b1e0a65 | 2075 | { |
c2d9ba9b | 2076 | write_pnet(&sk->sk_net, net); |
3b1e0a65 YH |
2077 | } |
2078 | ||
edf02087 DL |
2079 | /* |
2080 | * Kernel sockets, f.e. rtnl or icmp_socket, are a part of a namespace. | |
25985edc | 2081 | * They should not hold a reference to a namespace in order to allow |
edf02087 DL |
2082 | * to stop it. |
2083 | * Sockets after sk_change_net should be released using sk_release_kernel | |
2084 | */ | |
2085 | static inline void sk_change_net(struct sock *sk, struct net *net) | |
2086 | { | |
3b1e0a65 | 2087 | put_net(sock_net(sk)); |
65a18ec5 | 2088 | sock_net_set(sk, hold_net(net)); |
edf02087 DL |
2089 | } |
2090 | ||
23542618 KK |
2091 | static inline struct sock *skb_steal_sock(struct sk_buff *skb) |
2092 | { | |
2093 | if (unlikely(skb->sk)) { | |
2094 | struct sock *sk = skb->sk; | |
2095 | ||
2096 | skb->destructor = NULL; | |
2097 | skb->sk = NULL; | |
2098 | return sk; | |
2099 | } | |
2100 | return NULL; | |
2101 | } | |
2102 | ||
20d49473 | 2103 | extern void sock_enable_timestamp(struct sock *sk, int flag); |
1da177e4 | 2104 | extern int sock_get_timestamp(struct sock *, struct timeval __user *); |
ae40eb1e | 2105 | extern int sock_get_timestampns(struct sock *, struct timespec __user *); |
1da177e4 LT |
2106 | |
2107 | /* | |
2108 | * Enable debug/info messages | |
2109 | */ | |
a2a316fd SH |
2110 | extern int net_msg_warn; |
2111 | #define NETDEBUG(fmt, args...) \ | |
2112 | do { if (net_msg_warn) printk(fmt,##args); } while (0) | |
1da177e4 | 2113 | |
a2a316fd SH |
2114 | #define LIMIT_NETDEBUG(fmt, args...) \ |
2115 | do { if (net_msg_warn && net_ratelimit()) printk(fmt,##args); } while(0) | |
1da177e4 | 2116 | |
1da177e4 LT |
2117 | extern __u32 sysctl_wmem_max; |
2118 | extern __u32 sysctl_rmem_max; | |
2119 | ||
20380731 ACM |
2120 | extern void sk_init(void); |
2121 | ||
6baf1f41 DM |
2122 | extern int sysctl_optmem_max; |
2123 | ||
20380731 ACM |
2124 | extern __u32 sysctl_wmem_default; |
2125 | extern __u32 sysctl_rmem_default; | |
20380731 | 2126 | |
1da177e4 | 2127 | #endif /* _SOCK_H */ |