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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * INET An implementation of the TCP/IP protocol suite for the LINUX | |
3 | * operating system. INET is implemented using the BSD Socket | |
4 | * interface as the means of communication with the user level. | |
5 | * | |
6 | * Definitions for the AF_INET socket handler. | |
7 | * | |
8 | * Version: @(#)sock.h 1.0.4 05/13/93 | |
9 | * | |
02c30a84 | 10 | * Authors: Ross Biro |
1da177e4 LT |
11 | * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> |
12 | * Corey Minyard <wf-rch!minyard@relay.EU.net> | |
13 | * Florian La Roche <flla@stud.uni-sb.de> | |
14 | * | |
15 | * Fixes: | |
16 | * Alan Cox : Volatiles in skbuff pointers. See | |
17 | * skbuff comments. May be overdone, | |
18 | * better to prove they can be removed | |
19 | * than the reverse. | |
20 | * Alan Cox : Added a zapped field for tcp to note | |
21 | * a socket is reset and must stay shut up | |
22 | * Alan Cox : New fields for options | |
23 | * Pauline Middelink : identd support | |
24 | * Alan Cox : Eliminate low level recv/recvfrom | |
25 | * David S. Miller : New socket lookup architecture. | |
26 | * Steve Whitehouse: Default routines for sock_ops | |
27 | * Arnaldo C. Melo : removed net_pinfo, tp_pinfo and made | |
28 | * protinfo be just a void pointer, as the | |
29 | * protocol specific parts were moved to | |
30 | * respective headers and ipv4/v6, etc now | |
31 | * use private slabcaches for its socks | |
32 | * Pedro Hortas : New flags field for socket options | |
33 | * | |
34 | * | |
35 | * This program is free software; you can redistribute it and/or | |
36 | * modify it under the terms of the GNU General Public License | |
37 | * as published by the Free Software Foundation; either version | |
38 | * 2 of the License, or (at your option) any later version. | |
39 | */ | |
40 | #ifndef _SOCK_H | |
41 | #define _SOCK_H | |
42 | ||
a6b7a407 | 43 | #include <linux/hardirq.h> |
172589cc | 44 | #include <linux/kernel.h> |
1da177e4 | 45 | #include <linux/list.h> |
88ab1932 | 46 | #include <linux/list_nulls.h> |
1da177e4 LT |
47 | #include <linux/timer.h> |
48 | #include <linux/cache.h> | |
3f134619 | 49 | #include <linux/bitops.h> |
a5b5bb9a | 50 | #include <linux/lockdep.h> |
1da177e4 LT |
51 | #include <linux/netdevice.h> |
52 | #include <linux/skbuff.h> /* struct sk_buff */ | |
d7fe0f24 | 53 | #include <linux/mm.h> |
1da177e4 | 54 | #include <linux/security.h> |
5a0e3ad6 | 55 | #include <linux/slab.h> |
c6e1a0d1 | 56 | #include <linux/uaccess.h> |
180d8cd9 | 57 | #include <linux/memcontrol.h> |
e1aab161 | 58 | #include <linux/res_counter.h> |
c5905afb | 59 | #include <linux/static_key.h> |
40401530 AV |
60 | #include <linux/aio.h> |
61 | #include <linux/sched.h> | |
1da177e4 LT |
62 | |
63 | #include <linux/filter.h> | |
88ab1932 | 64 | #include <linux/rculist_nulls.h> |
a57de0b4 | 65 | #include <linux/poll.h> |
1da177e4 | 66 | |
c31504dc | 67 | #include <linux/atomic.h> |
1da177e4 LT |
68 | #include <net/dst.h> |
69 | #include <net/checksum.h> | |
70 | ||
9f048bfb ED |
71 | struct cgroup; |
72 | struct cgroup_subsys; | |
c607b2ed | 73 | #ifdef CONFIG_NET |
1d62e436 GC |
74 | int mem_cgroup_sockets_init(struct mem_cgroup *memcg, struct cgroup_subsys *ss); |
75 | void mem_cgroup_sockets_destroy(struct mem_cgroup *memcg); | |
c607b2ed GC |
76 | #else |
77 | static inline | |
1d62e436 | 78 | int mem_cgroup_sockets_init(struct mem_cgroup *memcg, struct cgroup_subsys *ss) |
c607b2ed GC |
79 | { |
80 | return 0; | |
81 | } | |
82 | static inline | |
1d62e436 | 83 | void mem_cgroup_sockets_destroy(struct mem_cgroup *memcg) |
c607b2ed GC |
84 | { |
85 | } | |
86 | #endif | |
1da177e4 LT |
87 | /* |
88 | * This structure really needs to be cleaned up. | |
89 | * Most of it is for TCP, and not used by any of | |
90 | * the other protocols. | |
91 | */ | |
92 | ||
93 | /* Define this to get the SOCK_DBG debugging facility. */ | |
94 | #define SOCK_DEBUGGING | |
95 | #ifdef SOCK_DEBUGGING | |
96 | #define SOCK_DEBUG(sk, msg...) do { if ((sk) && sock_flag((sk), SOCK_DBG)) \ | |
97 | printk(KERN_DEBUG msg); } while (0) | |
98 | #else | |
4cd9029d | 99 | /* Validate arguments and do nothing */ |
b9075fa9 | 100 | static inline __printf(2, 3) |
dc6b9b78 | 101 | void SOCK_DEBUG(const struct sock *sk, const char *msg, ...) |
4cd9029d SH |
102 | { |
103 | } | |
1da177e4 LT |
104 | #endif |
105 | ||
106 | /* This is the per-socket lock. The spinlock provides a synchronization | |
107 | * between user contexts and software interrupt processing, whereas the | |
108 | * mini-semaphore synchronizes multiple users amongst themselves. | |
109 | */ | |
1da177e4 LT |
110 | typedef struct { |
111 | spinlock_t slock; | |
d2e9117c | 112 | int owned; |
1da177e4 | 113 | wait_queue_head_t wq; |
a5b5bb9a IM |
114 | /* |
115 | * We express the mutex-alike socket_lock semantics | |
116 | * to the lock validator by explicitly managing | |
117 | * the slock as a lock variant (in addition to | |
118 | * the slock itself): | |
119 | */ | |
120 | #ifdef CONFIG_DEBUG_LOCK_ALLOC | |
121 | struct lockdep_map dep_map; | |
122 | #endif | |
1da177e4 LT |
123 | } socket_lock_t; |
124 | ||
1da177e4 | 125 | struct sock; |
8feaf0c0 | 126 | struct proto; |
0eeb8ffc | 127 | struct net; |
1da177e4 | 128 | |
077b393d ED |
129 | typedef __u32 __bitwise __portpair; |
130 | typedef __u64 __bitwise __addrpair; | |
131 | ||
1da177e4 | 132 | /** |
4dc3b16b | 133 | * struct sock_common - minimal network layer representation of sockets |
68835aba ED |
134 | * @skc_daddr: Foreign IPv4 addr |
135 | * @skc_rcv_saddr: Bound local IPv4 addr | |
4dc6dc71 | 136 | * @skc_hash: hash value used with various protocol lookup tables |
d4cada4a | 137 | * @skc_u16hashes: two u16 hash values used by UDP lookup tables |
ce43b03e ED |
138 | * @skc_dport: placeholder for inet_dport/tw_dport |
139 | * @skc_num: placeholder for inet_num/tw_num | |
4dc3b16b PP |
140 | * @skc_family: network address family |
141 | * @skc_state: Connection state | |
142 | * @skc_reuse: %SO_REUSEADDR setting | |
055dc21a | 143 | * @skc_reuseport: %SO_REUSEPORT setting |
4dc3b16b | 144 | * @skc_bound_dev_if: bound device index if != 0 |
4dc3b16b | 145 | * @skc_bind_node: bind hash linkage for various protocol lookup tables |
512615b6 | 146 | * @skc_portaddr_node: second hash linkage for UDP/UDP-Lite protocol |
8feaf0c0 | 147 | * @skc_prot: protocol handlers inside a network family |
07feaebf | 148 | * @skc_net: reference to the network namespace of this socket |
68835aba ED |
149 | * @skc_node: main hash linkage for various protocol lookup tables |
150 | * @skc_nulls_node: main hash linkage for TCP/UDP/UDP-Lite protocol | |
151 | * @skc_tx_queue_mapping: tx queue number for this connection | |
152 | * @skc_refcnt: reference count | |
4dc3b16b PP |
153 | * |
154 | * This is the minimal network layer representation of sockets, the header | |
8feaf0c0 ACM |
155 | * for struct sock and struct inet_timewait_sock. |
156 | */ | |
1da177e4 | 157 | struct sock_common { |
ce43b03e ED |
158 | /* skc_daddr and skc_rcv_saddr must be grouped on a 8 bytes aligned |
159 | * address on 64bit arches : cf INET_MATCH() and INET_TW_MATCH() | |
4dc6dc71 | 160 | */ |
ce43b03e | 161 | union { |
077b393d | 162 | __addrpair skc_addrpair; |
ce43b03e ED |
163 | struct { |
164 | __be32 skc_daddr; | |
165 | __be32 skc_rcv_saddr; | |
166 | }; | |
167 | }; | |
d4cada4a ED |
168 | union { |
169 | unsigned int skc_hash; | |
170 | __u16 skc_u16hashes[2]; | |
171 | }; | |
ce43b03e ED |
172 | /* skc_dport && skc_num must be grouped as well */ |
173 | union { | |
077b393d | 174 | __portpair skc_portpair; |
ce43b03e ED |
175 | struct { |
176 | __be16 skc_dport; | |
177 | __u16 skc_num; | |
178 | }; | |
179 | }; | |
180 | ||
4dc6dc71 ED |
181 | unsigned short skc_family; |
182 | volatile unsigned char skc_state; | |
055dc21a TH |
183 | unsigned char skc_reuse:4; |
184 | unsigned char skc_reuseport:4; | |
4dc6dc71 | 185 | int skc_bound_dev_if; |
512615b6 ED |
186 | union { |
187 | struct hlist_node skc_bind_node; | |
188 | struct hlist_nulls_node skc_portaddr_node; | |
189 | }; | |
8feaf0c0 | 190 | struct proto *skc_prot; |
3b1e0a65 | 191 | #ifdef CONFIG_NET_NS |
07feaebf | 192 | struct net *skc_net; |
3b1e0a65 | 193 | #endif |
68835aba ED |
194 | /* |
195 | * fields between dontcopy_begin/dontcopy_end | |
196 | * are not copied in sock_copy() | |
197 | */ | |
928c41e7 | 198 | /* private: */ |
68835aba | 199 | int skc_dontcopy_begin[0]; |
928c41e7 | 200 | /* public: */ |
68835aba ED |
201 | union { |
202 | struct hlist_node skc_node; | |
203 | struct hlist_nulls_node skc_nulls_node; | |
204 | }; | |
205 | int skc_tx_queue_mapping; | |
206 | atomic_t skc_refcnt; | |
928c41e7 | 207 | /* private: */ |
68835aba | 208 | int skc_dontcopy_end[0]; |
928c41e7 | 209 | /* public: */ |
1da177e4 LT |
210 | }; |
211 | ||
e1aab161 | 212 | struct cg_proto; |
1da177e4 LT |
213 | /** |
214 | * struct sock - network layer representation of sockets | |
8feaf0c0 | 215 | * @__sk_common: shared layout with inet_timewait_sock |
4dc3b16b PP |
216 | * @sk_shutdown: mask of %SEND_SHUTDOWN and/or %RCV_SHUTDOWN |
217 | * @sk_userlocks: %SO_SNDBUF and %SO_RCVBUF settings | |
218 | * @sk_lock: synchronizer | |
219 | * @sk_rcvbuf: size of receive buffer in bytes | |
43815482 | 220 | * @sk_wq: sock wait queue and async head |
deaa5854 | 221 | * @sk_rx_dst: receive input route used by early tcp demux |
4dc3b16b PP |
222 | * @sk_dst_cache: destination cache |
223 | * @sk_dst_lock: destination cache lock | |
224 | * @sk_policy: flow policy | |
4dc3b16b PP |
225 | * @sk_receive_queue: incoming packets |
226 | * @sk_wmem_alloc: transmit queue bytes committed | |
227 | * @sk_write_queue: Packet sending queue | |
97fc2f08 | 228 | * @sk_async_wait_queue: DMA copied packets |
4dc3b16b PP |
229 | * @sk_omem_alloc: "o" is "option" or "other" |
230 | * @sk_wmem_queued: persistent queue size | |
231 | * @sk_forward_alloc: space allocated forward | |
06021292 | 232 | * @sk_napi_id: id of the last napi context to receive data for sk |
dafcc438 | 233 | * @sk_ll_usec: usecs to busypoll when there is no data |
4dc3b16b PP |
234 | * @sk_allocation: allocation mode |
235 | * @sk_sndbuf: size of send buffer in bytes | |
33c732c3 | 236 | * @sk_flags: %SO_LINGER (l_onoff), %SO_BROADCAST, %SO_KEEPALIVE, |
20d49473 | 237 | * %SO_OOBINLINE settings, %SO_TIMESTAMPING settings |
48fc7f7e | 238 | * @sk_no_check: %SO_NO_CHECK setting, whether or not checkup packets |
4dc3b16b | 239 | * @sk_route_caps: route capabilities (e.g. %NETIF_F_TSO) |
a465419b | 240 | * @sk_route_nocaps: forbidden route capabilities (e.g NETIF_F_GSO_MASK) |
bcd76111 | 241 | * @sk_gso_type: GSO type (e.g. %SKB_GSO_TCPV4) |
82cc1a7a | 242 | * @sk_gso_max_size: Maximum GSO segment size to build |
1485348d | 243 | * @sk_gso_max_segs: Maximum number of GSO segments |
4dc3b16b | 244 | * @sk_lingertime: %SO_LINGER l_linger setting |
4dc3b16b PP |
245 | * @sk_backlog: always used with the per-socket spinlock held |
246 | * @sk_callback_lock: used with the callbacks in the end of this struct | |
247 | * @sk_error_queue: rarely used | |
33c732c3 WC |
248 | * @sk_prot_creator: sk_prot of original sock creator (see ipv6_setsockopt, |
249 | * IPV6_ADDRFORM for instance) | |
4dc3b16b | 250 | * @sk_err: last error |
33c732c3 WC |
251 | * @sk_err_soft: errors that don't cause failure but are the cause of a |
252 | * persistent failure not just 'timed out' | |
cb61cb9b | 253 | * @sk_drops: raw/udp drops counter |
4dc3b16b PP |
254 | * @sk_ack_backlog: current listen backlog |
255 | * @sk_max_ack_backlog: listen backlog set in listen() | |
256 | * @sk_priority: %SO_PRIORITY setting | |
1a3bc369 | 257 | * @sk_cgrp_prioidx: socket group's priority map index |
4dc3b16b PP |
258 | * @sk_type: socket type (%SOCK_STREAM, etc) |
259 | * @sk_protocol: which protocol this socket belongs in this network family | |
53c3fa20 RD |
260 | * @sk_peer_pid: &struct pid for this socket's peer |
261 | * @sk_peer_cred: %SO_PEERCRED setting | |
4dc3b16b PP |
262 | * @sk_rcvlowat: %SO_RCVLOWAT setting |
263 | * @sk_rcvtimeo: %SO_RCVTIMEO setting | |
264 | * @sk_sndtimeo: %SO_SNDTIMEO setting | |
c58dc01b | 265 | * @sk_rxhash: flow hash received from netif layer |
4dc3b16b PP |
266 | * @sk_filter: socket filtering instructions |
267 | * @sk_protinfo: private area, net family specific, when not using slab | |
268 | * @sk_timer: sock cleanup timer | |
269 | * @sk_stamp: time stamp of last packet received | |
270 | * @sk_socket: Identd and reporting IO signals | |
271 | * @sk_user_data: RPC layer private data | |
5640f768 | 272 | * @sk_frag: cached page frag |
d3d4f0a0 | 273 | * @sk_peek_off: current peek_offset value |
4dc3b16b | 274 | * @sk_send_head: front of stuff to transmit |
67be2dd1 | 275 | * @sk_security: used by security modules |
31729363 | 276 | * @sk_mark: generic packet mark |
53c3fa20 | 277 | * @sk_classid: this socket's cgroup classid |
e1aab161 | 278 | * @sk_cgrp: this socket's cgroup-specific proto data |
4dc3b16b PP |
279 | * @sk_write_pending: a write to stream socket waits to start |
280 | * @sk_state_change: callback to indicate change in the state of the sock | |
281 | * @sk_data_ready: callback to indicate there is data to be processed | |
282 | * @sk_write_space: callback to indicate there is bf sending space available | |
283 | * @sk_error_report: callback to indicate errors (e.g. %MSG_ERRQUEUE) | |
284 | * @sk_backlog_rcv: callback to process the backlog | |
285 | * @sk_destruct: called at sock freeing time, i.e. when all refcnt == 0 | |
1da177e4 LT |
286 | */ |
287 | struct sock { | |
288 | /* | |
8feaf0c0 | 289 | * Now struct inet_timewait_sock also uses sock_common, so please just |
1da177e4 LT |
290 | * don't add nothing before this first member (__sk_common) --acme |
291 | */ | |
292 | struct sock_common __sk_common; | |
4dc6dc71 ED |
293 | #define sk_node __sk_common.skc_node |
294 | #define sk_nulls_node __sk_common.skc_nulls_node | |
295 | #define sk_refcnt __sk_common.skc_refcnt | |
e022f0b4 | 296 | #define sk_tx_queue_mapping __sk_common.skc_tx_queue_mapping |
4dc6dc71 | 297 | |
68835aba ED |
298 | #define sk_dontcopy_begin __sk_common.skc_dontcopy_begin |
299 | #define sk_dontcopy_end __sk_common.skc_dontcopy_end | |
4dc6dc71 | 300 | #define sk_hash __sk_common.skc_hash |
1da177e4 LT |
301 | #define sk_family __sk_common.skc_family |
302 | #define sk_state __sk_common.skc_state | |
303 | #define sk_reuse __sk_common.skc_reuse | |
055dc21a | 304 | #define sk_reuseport __sk_common.skc_reuseport |
1da177e4 | 305 | #define sk_bound_dev_if __sk_common.skc_bound_dev_if |
1da177e4 | 306 | #define sk_bind_node __sk_common.skc_bind_node |
8feaf0c0 | 307 | #define sk_prot __sk_common.skc_prot |
07feaebf | 308 | #define sk_net __sk_common.skc_net |
1da177e4 | 309 | socket_lock_t sk_lock; |
b178bb3d | 310 | struct sk_buff_head sk_receive_queue; |
fa438ccf ED |
311 | /* |
312 | * The backlog queue is special, it is always used with | |
313 | * the per-socket spinlock held and requires low latency | |
314 | * access. Therefore we special case it's implementation. | |
b178bb3d ED |
315 | * Note : rmem_alloc is in this structure to fill a hole |
316 | * on 64bit arches, not because its logically part of | |
317 | * backlog. | |
fa438ccf ED |
318 | */ |
319 | struct { | |
b178bb3d ED |
320 | atomic_t rmem_alloc; |
321 | int len; | |
322 | struct sk_buff *head; | |
323 | struct sk_buff *tail; | |
fa438ccf | 324 | } sk_backlog; |
b178bb3d ED |
325 | #define sk_rmem_alloc sk_backlog.rmem_alloc |
326 | int sk_forward_alloc; | |
327 | #ifdef CONFIG_RPS | |
328 | __u32 sk_rxhash; | |
06021292 ET |
329 | #endif |
330 | #ifdef CONFIG_NET_LL_RX_POLL | |
331 | unsigned int sk_napi_id; | |
dafcc438 | 332 | unsigned int sk_ll_usec; |
b178bb3d ED |
333 | #endif |
334 | atomic_t sk_drops; | |
335 | int sk_rcvbuf; | |
336 | ||
337 | struct sk_filter __rcu *sk_filter; | |
eaefd110 | 338 | struct socket_wq __rcu *sk_wq; |
b178bb3d ED |
339 | |
340 | #ifdef CONFIG_NET_DMA | |
341 | struct sk_buff_head sk_async_wait_queue; | |
342 | #endif | |
343 | ||
def8b4fa | 344 | #ifdef CONFIG_XFRM |
1da177e4 | 345 | struct xfrm_policy *sk_policy[2]; |
def8b4fa | 346 | #endif |
b178bb3d | 347 | unsigned long sk_flags; |
deaa5854 | 348 | struct dst_entry *sk_rx_dst; |
0e36cbb3 | 349 | struct dst_entry __rcu *sk_dst_cache; |
b6c6712a | 350 | spinlock_t sk_dst_lock; |
1da177e4 LT |
351 | atomic_t sk_wmem_alloc; |
352 | atomic_t sk_omem_alloc; | |
4e07a91c | 353 | int sk_sndbuf; |
1da177e4 | 354 | struct sk_buff_head sk_write_queue; |
b178bb3d ED |
355 | kmemcheck_bitfield_begin(flags); |
356 | unsigned int sk_shutdown : 2, | |
357 | sk_no_check : 2, | |
358 | sk_userlocks : 4, | |
359 | sk_protocol : 8, | |
360 | sk_type : 16; | |
361 | kmemcheck_bitfield_end(flags); | |
1da177e4 | 362 | int sk_wmem_queued; |
7d877f3b | 363 | gfp_t sk_allocation; |
c8f44aff MM |
364 | netdev_features_t sk_route_caps; |
365 | netdev_features_t sk_route_nocaps; | |
bcd76111 | 366 | int sk_gso_type; |
82cc1a7a | 367 | unsigned int sk_gso_max_size; |
1485348d | 368 | u16 sk_gso_max_segs; |
9932cf95 | 369 | int sk_rcvlowat; |
1da177e4 | 370 | unsigned long sk_lingertime; |
1da177e4 | 371 | struct sk_buff_head sk_error_queue; |
476e19cf | 372 | struct proto *sk_prot_creator; |
1da177e4 LT |
373 | rwlock_t sk_callback_lock; |
374 | int sk_err, | |
375 | sk_err_soft; | |
376 | unsigned short sk_ack_backlog; | |
377 | unsigned short sk_max_ack_backlog; | |
378 | __u32 sk_priority; | |
3d0dcfbd | 379 | #if IS_ENABLED(CONFIG_NETPRIO_CGROUP) |
5bc1421e NH |
380 | __u32 sk_cgrp_prioidx; |
381 | #endif | |
109f6e39 EB |
382 | struct pid *sk_peer_pid; |
383 | const struct cred *sk_peer_cred; | |
1da177e4 LT |
384 | long sk_rcvtimeo; |
385 | long sk_sndtimeo; | |
1da177e4 LT |
386 | void *sk_protinfo; |
387 | struct timer_list sk_timer; | |
b7aa0bf7 | 388 | ktime_t sk_stamp; |
1da177e4 LT |
389 | struct socket *sk_socket; |
390 | void *sk_user_data; | |
5640f768 | 391 | struct page_frag sk_frag; |
1da177e4 | 392 | struct sk_buff *sk_send_head; |
ef64a54f | 393 | __s32 sk_peek_off; |
1da177e4 | 394 | int sk_write_pending; |
d5f64238 | 395 | #ifdef CONFIG_SECURITY |
1da177e4 | 396 | void *sk_security; |
d5f64238 | 397 | #endif |
4a19ec58 | 398 | __u32 sk_mark; |
f8451725 | 399 | u32 sk_classid; |
e1aab161 | 400 | struct cg_proto *sk_cgrp; |
1da177e4 LT |
401 | void (*sk_state_change)(struct sock *sk); |
402 | void (*sk_data_ready)(struct sock *sk, int bytes); | |
403 | void (*sk_write_space)(struct sock *sk); | |
404 | void (*sk_error_report)(struct sock *sk); | |
dc6b9b78 ED |
405 | int (*sk_backlog_rcv)(struct sock *sk, |
406 | struct sk_buff *skb); | |
1da177e4 LT |
407 | void (*sk_destruct)(struct sock *sk); |
408 | }; | |
409 | ||
4a17fd52 PE |
410 | /* |
411 | * SK_CAN_REUSE and SK_NO_REUSE on a socket mean that the socket is OK | |
412 | * or not whether his port will be reused by someone else. SK_FORCE_REUSE | |
413 | * on a socket means that the socket will reuse everybody else's port | |
414 | * without looking at the other's sk_reuse value. | |
415 | */ | |
416 | ||
417 | #define SK_NO_REUSE 0 | |
418 | #define SK_CAN_REUSE 1 | |
419 | #define SK_FORCE_REUSE 2 | |
420 | ||
ef64a54f PE |
421 | static inline int sk_peek_offset(struct sock *sk, int flags) |
422 | { | |
423 | if ((flags & MSG_PEEK) && (sk->sk_peek_off >= 0)) | |
424 | return sk->sk_peek_off; | |
425 | else | |
426 | return 0; | |
427 | } | |
428 | ||
429 | static inline void sk_peek_offset_bwd(struct sock *sk, int val) | |
430 | { | |
431 | if (sk->sk_peek_off >= 0) { | |
432 | if (sk->sk_peek_off >= val) | |
433 | sk->sk_peek_off -= val; | |
434 | else | |
435 | sk->sk_peek_off = 0; | |
436 | } | |
437 | } | |
438 | ||
439 | static inline void sk_peek_offset_fwd(struct sock *sk, int val) | |
440 | { | |
441 | if (sk->sk_peek_off >= 0) | |
442 | sk->sk_peek_off += val; | |
443 | } | |
444 | ||
1da177e4 LT |
445 | /* |
446 | * Hashed lists helper routines | |
447 | */ | |
c4146644 LZ |
448 | static inline struct sock *sk_entry(const struct hlist_node *node) |
449 | { | |
450 | return hlist_entry(node, struct sock, sk_node); | |
451 | } | |
452 | ||
e48c414e | 453 | static inline struct sock *__sk_head(const struct hlist_head *head) |
1da177e4 LT |
454 | { |
455 | return hlist_entry(head->first, struct sock, sk_node); | |
456 | } | |
457 | ||
e48c414e | 458 | static inline struct sock *sk_head(const struct hlist_head *head) |
1da177e4 LT |
459 | { |
460 | return hlist_empty(head) ? NULL : __sk_head(head); | |
461 | } | |
462 | ||
88ab1932 ED |
463 | static inline struct sock *__sk_nulls_head(const struct hlist_nulls_head *head) |
464 | { | |
465 | return hlist_nulls_entry(head->first, struct sock, sk_nulls_node); | |
466 | } | |
467 | ||
468 | static inline struct sock *sk_nulls_head(const struct hlist_nulls_head *head) | |
469 | { | |
470 | return hlist_nulls_empty(head) ? NULL : __sk_nulls_head(head); | |
471 | } | |
472 | ||
e48c414e | 473 | static inline struct sock *sk_next(const struct sock *sk) |
1da177e4 LT |
474 | { |
475 | return sk->sk_node.next ? | |
476 | hlist_entry(sk->sk_node.next, struct sock, sk_node) : NULL; | |
477 | } | |
478 | ||
88ab1932 ED |
479 | static inline struct sock *sk_nulls_next(const struct sock *sk) |
480 | { | |
481 | return (!is_a_nulls(sk->sk_nulls_node.next)) ? | |
482 | hlist_nulls_entry(sk->sk_nulls_node.next, | |
483 | struct sock, sk_nulls_node) : | |
484 | NULL; | |
485 | } | |
486 | ||
dc6b9b78 | 487 | static inline bool sk_unhashed(const struct sock *sk) |
1da177e4 LT |
488 | { |
489 | return hlist_unhashed(&sk->sk_node); | |
490 | } | |
491 | ||
dc6b9b78 | 492 | static inline bool sk_hashed(const struct sock *sk) |
1da177e4 | 493 | { |
da753bea | 494 | return !sk_unhashed(sk); |
1da177e4 LT |
495 | } |
496 | ||
dc6b9b78 | 497 | static inline void sk_node_init(struct hlist_node *node) |
1da177e4 LT |
498 | { |
499 | node->pprev = NULL; | |
500 | } | |
501 | ||
dc6b9b78 | 502 | static inline void sk_nulls_node_init(struct hlist_nulls_node *node) |
88ab1932 ED |
503 | { |
504 | node->pprev = NULL; | |
505 | } | |
506 | ||
dc6b9b78 | 507 | static inline void __sk_del_node(struct sock *sk) |
1da177e4 LT |
508 | { |
509 | __hlist_del(&sk->sk_node); | |
510 | } | |
511 | ||
808f5114 | 512 | /* NB: equivalent to hlist_del_init_rcu */ |
dc6b9b78 | 513 | static inline bool __sk_del_node_init(struct sock *sk) |
1da177e4 LT |
514 | { |
515 | if (sk_hashed(sk)) { | |
516 | __sk_del_node(sk); | |
517 | sk_node_init(&sk->sk_node); | |
dc6b9b78 | 518 | return true; |
1da177e4 | 519 | } |
dc6b9b78 | 520 | return false; |
1da177e4 LT |
521 | } |
522 | ||
523 | /* Grab socket reference count. This operation is valid only | |
524 | when sk is ALREADY grabbed f.e. it is found in hash table | |
525 | or a list and the lookup is made under lock preventing hash table | |
526 | modifications. | |
527 | */ | |
528 | ||
529 | static inline void sock_hold(struct sock *sk) | |
530 | { | |
531 | atomic_inc(&sk->sk_refcnt); | |
532 | } | |
533 | ||
534 | /* Ungrab socket in the context, which assumes that socket refcnt | |
535 | cannot hit zero, f.e. it is true in context of any socketcall. | |
536 | */ | |
537 | static inline void __sock_put(struct sock *sk) | |
538 | { | |
539 | atomic_dec(&sk->sk_refcnt); | |
540 | } | |
541 | ||
dc6b9b78 | 542 | static inline bool sk_del_node_init(struct sock *sk) |
1da177e4 | 543 | { |
dc6b9b78 | 544 | bool rc = __sk_del_node_init(sk); |
1da177e4 LT |
545 | |
546 | if (rc) { | |
547 | /* paranoid for a while -acme */ | |
548 | WARN_ON(atomic_read(&sk->sk_refcnt) == 1); | |
549 | __sock_put(sk); | |
550 | } | |
551 | return rc; | |
552 | } | |
808f5114 | 553 | #define sk_del_node_init_rcu(sk) sk_del_node_init(sk) |
1da177e4 | 554 | |
dc6b9b78 | 555 | static inline bool __sk_nulls_del_node_init_rcu(struct sock *sk) |
271b72c7 ED |
556 | { |
557 | if (sk_hashed(sk)) { | |
88ab1932 | 558 | hlist_nulls_del_init_rcu(&sk->sk_nulls_node); |
dc6b9b78 | 559 | return true; |
271b72c7 | 560 | } |
dc6b9b78 | 561 | return false; |
271b72c7 ED |
562 | } |
563 | ||
dc6b9b78 | 564 | static inline bool sk_nulls_del_node_init_rcu(struct sock *sk) |
271b72c7 | 565 | { |
dc6b9b78 | 566 | bool rc = __sk_nulls_del_node_init_rcu(sk); |
271b72c7 ED |
567 | |
568 | if (rc) { | |
569 | /* paranoid for a while -acme */ | |
570 | WARN_ON(atomic_read(&sk->sk_refcnt) == 1); | |
571 | __sock_put(sk); | |
572 | } | |
573 | return rc; | |
574 | } | |
575 | ||
dc6b9b78 | 576 | static inline void __sk_add_node(struct sock *sk, struct hlist_head *list) |
1da177e4 LT |
577 | { |
578 | hlist_add_head(&sk->sk_node, list); | |
579 | } | |
580 | ||
dc6b9b78 | 581 | static inline void sk_add_node(struct sock *sk, struct hlist_head *list) |
1da177e4 LT |
582 | { |
583 | sock_hold(sk); | |
584 | __sk_add_node(sk, list); | |
585 | } | |
586 | ||
dc6b9b78 | 587 | static inline void sk_add_node_rcu(struct sock *sk, struct hlist_head *list) |
808f5114 | 588 | { |
589 | sock_hold(sk); | |
590 | hlist_add_head_rcu(&sk->sk_node, list); | |
591 | } | |
592 | ||
dc6b9b78 | 593 | static inline void __sk_nulls_add_node_rcu(struct sock *sk, struct hlist_nulls_head *list) |
271b72c7 | 594 | { |
88ab1932 | 595 | hlist_nulls_add_head_rcu(&sk->sk_nulls_node, list); |
271b72c7 ED |
596 | } |
597 | ||
dc6b9b78 | 598 | static inline void sk_nulls_add_node_rcu(struct sock *sk, struct hlist_nulls_head *list) |
271b72c7 ED |
599 | { |
600 | sock_hold(sk); | |
88ab1932 | 601 | __sk_nulls_add_node_rcu(sk, list); |
271b72c7 ED |
602 | } |
603 | ||
dc6b9b78 | 604 | static inline void __sk_del_bind_node(struct sock *sk) |
1da177e4 LT |
605 | { |
606 | __hlist_del(&sk->sk_bind_node); | |
607 | } | |
608 | ||
dc6b9b78 | 609 | static inline void sk_add_bind_node(struct sock *sk, |
1da177e4 LT |
610 | struct hlist_head *list) |
611 | { | |
612 | hlist_add_head(&sk->sk_bind_node, list); | |
613 | } | |
614 | ||
b67bfe0d SL |
615 | #define sk_for_each(__sk, list) \ |
616 | hlist_for_each_entry(__sk, list, sk_node) | |
617 | #define sk_for_each_rcu(__sk, list) \ | |
618 | hlist_for_each_entry_rcu(__sk, list, sk_node) | |
88ab1932 ED |
619 | #define sk_nulls_for_each(__sk, node, list) \ |
620 | hlist_nulls_for_each_entry(__sk, node, list, sk_nulls_node) | |
621 | #define sk_nulls_for_each_rcu(__sk, node, list) \ | |
622 | hlist_nulls_for_each_entry_rcu(__sk, node, list, sk_nulls_node) | |
b67bfe0d SL |
623 | #define sk_for_each_from(__sk) \ |
624 | hlist_for_each_entry_from(__sk, sk_node) | |
88ab1932 ED |
625 | #define sk_nulls_for_each_from(__sk, node) \ |
626 | if (__sk && ({ node = &(__sk)->sk_nulls_node; 1; })) \ | |
627 | hlist_nulls_for_each_entry_from(__sk, node, sk_nulls_node) | |
b67bfe0d SL |
628 | #define sk_for_each_safe(__sk, tmp, list) \ |
629 | hlist_for_each_entry_safe(__sk, tmp, list, sk_node) | |
630 | #define sk_for_each_bound(__sk, list) \ | |
631 | hlist_for_each_entry(__sk, list, sk_bind_node) | |
1da177e4 | 632 | |
c336d148 EB |
633 | static inline struct user_namespace *sk_user_ns(struct sock *sk) |
634 | { | |
635 | /* Careful only use this in a context where these parameters | |
636 | * can not change and must all be valid, such as recvmsg from | |
637 | * userspace. | |
638 | */ | |
639 | return sk->sk_socket->file->f_cred->user_ns; | |
640 | } | |
641 | ||
1da177e4 LT |
642 | /* Sock flags */ |
643 | enum sock_flags { | |
644 | SOCK_DEAD, | |
645 | SOCK_DONE, | |
646 | SOCK_URGINLINE, | |
647 | SOCK_KEEPOPEN, | |
648 | SOCK_LINGER, | |
649 | SOCK_DESTROY, | |
650 | SOCK_BROADCAST, | |
651 | SOCK_TIMESTAMP, | |
652 | SOCK_ZAPPED, | |
653 | SOCK_USE_WRITE_QUEUE, /* whether to call sk->sk_write_space in sock_wfree */ | |
654 | SOCK_DBG, /* %SO_DEBUG setting */ | |
655 | SOCK_RCVTSTAMP, /* %SO_TIMESTAMP setting */ | |
92f37fd2 | 656 | SOCK_RCVTSTAMPNS, /* %SO_TIMESTAMPNS setting */ |
1da177e4 LT |
657 | SOCK_LOCALROUTE, /* route locally only, %SO_DONTROUTE setting */ |
658 | SOCK_QUEUE_SHRUNK, /* write queue has been shrunk recently */ | |
7cb02404 | 659 | SOCK_MEMALLOC, /* VM depends on this socket for swapping */ |
20d49473 PO |
660 | SOCK_TIMESTAMPING_TX_HARDWARE, /* %SOF_TIMESTAMPING_TX_HARDWARE */ |
661 | SOCK_TIMESTAMPING_TX_SOFTWARE, /* %SOF_TIMESTAMPING_TX_SOFTWARE */ | |
662 | SOCK_TIMESTAMPING_RX_HARDWARE, /* %SOF_TIMESTAMPING_RX_HARDWARE */ | |
663 | SOCK_TIMESTAMPING_RX_SOFTWARE, /* %SOF_TIMESTAMPING_RX_SOFTWARE */ | |
664 | SOCK_TIMESTAMPING_SOFTWARE, /* %SOF_TIMESTAMPING_SOFTWARE */ | |
665 | SOCK_TIMESTAMPING_RAW_HARDWARE, /* %SOF_TIMESTAMPING_RAW_HARDWARE */ | |
666 | SOCK_TIMESTAMPING_SYS_HARDWARE, /* %SOF_TIMESTAMPING_SYS_HARDWARE */ | |
bcdce719 | 667 | SOCK_FASYNC, /* fasync() active */ |
3b885787 | 668 | SOCK_RXQ_OVFL, |
1cdebb42 | 669 | SOCK_ZEROCOPY, /* buffers from userspace */ |
6e3e939f | 670 | SOCK_WIFI_STATUS, /* push wifi status to userspace */ |
3bdc0eba BG |
671 | SOCK_NOFCS, /* Tell NIC not to do the Ethernet FCS. |
672 | * Will use last 4 bytes of packet sent from | |
673 | * user-space instead. | |
674 | */ | |
d59577b6 | 675 | SOCK_FILTER_LOCKED, /* Filter cannot be changed anymore */ |
7d4c04fc | 676 | SOCK_SELECT_ERR_QUEUE, /* Wake select on error queue */ |
1da177e4 LT |
677 | }; |
678 | ||
53b924b3 RB |
679 | static inline void sock_copy_flags(struct sock *nsk, struct sock *osk) |
680 | { | |
681 | nsk->sk_flags = osk->sk_flags; | |
682 | } | |
683 | ||
1da177e4 LT |
684 | static inline void sock_set_flag(struct sock *sk, enum sock_flags flag) |
685 | { | |
686 | __set_bit(flag, &sk->sk_flags); | |
687 | } | |
688 | ||
689 | static inline void sock_reset_flag(struct sock *sk, enum sock_flags flag) | |
690 | { | |
691 | __clear_bit(flag, &sk->sk_flags); | |
692 | } | |
693 | ||
1b23a5df | 694 | static inline bool sock_flag(const struct sock *sk, enum sock_flags flag) |
1da177e4 LT |
695 | { |
696 | return test_bit(flag, &sk->sk_flags); | |
697 | } | |
698 | ||
c93bdd0e MG |
699 | #ifdef CONFIG_NET |
700 | extern struct static_key memalloc_socks; | |
701 | static inline int sk_memalloc_socks(void) | |
702 | { | |
703 | return static_key_false(&memalloc_socks); | |
704 | } | |
705 | #else | |
706 | ||
707 | static inline int sk_memalloc_socks(void) | |
708 | { | |
709 | return 0; | |
710 | } | |
711 | ||
712 | #endif | |
713 | ||
99a1dec7 MG |
714 | static inline gfp_t sk_gfp_atomic(struct sock *sk, gfp_t gfp_mask) |
715 | { | |
7cb02404 | 716 | return GFP_ATOMIC | (sk->sk_allocation & __GFP_MEMALLOC); |
99a1dec7 MG |
717 | } |
718 | ||
1da177e4 LT |
719 | static inline void sk_acceptq_removed(struct sock *sk) |
720 | { | |
721 | sk->sk_ack_backlog--; | |
722 | } | |
723 | ||
724 | static inline void sk_acceptq_added(struct sock *sk) | |
725 | { | |
726 | sk->sk_ack_backlog++; | |
727 | } | |
728 | ||
dc6b9b78 | 729 | static inline bool sk_acceptq_is_full(const struct sock *sk) |
1da177e4 | 730 | { |
64a14651 | 731 | return sk->sk_ack_backlog > sk->sk_max_ack_backlog; |
1da177e4 LT |
732 | } |
733 | ||
734 | /* | |
735 | * Compute minimal free write space needed to queue new packets. | |
736 | */ | |
dc6b9b78 | 737 | static inline int sk_stream_min_wspace(const struct sock *sk) |
1da177e4 | 738 | { |
8df09ea3 | 739 | return sk->sk_wmem_queued >> 1; |
1da177e4 LT |
740 | } |
741 | ||
dc6b9b78 | 742 | static inline int sk_stream_wspace(const struct sock *sk) |
1da177e4 LT |
743 | { |
744 | return sk->sk_sndbuf - sk->sk_wmem_queued; | |
745 | } | |
746 | ||
747 | extern void sk_stream_write_space(struct sock *sk); | |
748 | ||
dc6b9b78 | 749 | static inline bool sk_stream_memory_free(const struct sock *sk) |
1da177e4 LT |
750 | { |
751 | return sk->sk_wmem_queued < sk->sk_sndbuf; | |
752 | } | |
753 | ||
8eae939f | 754 | /* OOB backlog add */ |
a3a858ff | 755 | static inline void __sk_add_backlog(struct sock *sk, struct sk_buff *skb) |
9ee6b535 | 756 | { |
7fee226a ED |
757 | /* dont let skb dst not refcounted, we are going to leave rcu lock */ |
758 | skb_dst_force(skb); | |
759 | ||
760 | if (!sk->sk_backlog.tail) | |
761 | sk->sk_backlog.head = skb; | |
762 | else | |
9ee6b535 | 763 | sk->sk_backlog.tail->next = skb; |
7fee226a ED |
764 | |
765 | sk->sk_backlog.tail = skb; | |
9ee6b535 SH |
766 | skb->next = NULL; |
767 | } | |
1da177e4 | 768 | |
c377411f ED |
769 | /* |
770 | * Take into account size of receive queue and backlog queue | |
0fd7bac6 ED |
771 | * Do not take into account this skb truesize, |
772 | * to allow even a single big packet to come. | |
c377411f | 773 | */ |
f545a38f ED |
774 | static inline bool sk_rcvqueues_full(const struct sock *sk, const struct sk_buff *skb, |
775 | unsigned int limit) | |
c377411f ED |
776 | { |
777 | unsigned int qsize = sk->sk_backlog.len + atomic_read(&sk->sk_rmem_alloc); | |
778 | ||
f545a38f | 779 | return qsize > limit; |
c377411f ED |
780 | } |
781 | ||
8eae939f | 782 | /* The per-socket spinlock must be held here. */ |
f545a38f ED |
783 | static inline __must_check int sk_add_backlog(struct sock *sk, struct sk_buff *skb, |
784 | unsigned int limit) | |
8eae939f | 785 | { |
f545a38f | 786 | if (sk_rcvqueues_full(sk, skb, limit)) |
8eae939f ZY |
787 | return -ENOBUFS; |
788 | ||
a3a858ff | 789 | __sk_add_backlog(sk, skb); |
8eae939f ZY |
790 | sk->sk_backlog.len += skb->truesize; |
791 | return 0; | |
792 | } | |
793 | ||
b4b9e355 MG |
794 | extern int __sk_backlog_rcv(struct sock *sk, struct sk_buff *skb); |
795 | ||
c57943a1 PZ |
796 | static inline int sk_backlog_rcv(struct sock *sk, struct sk_buff *skb) |
797 | { | |
b4b9e355 MG |
798 | if (sk_memalloc_socks() && skb_pfmemalloc(skb)) |
799 | return __sk_backlog_rcv(sk, skb); | |
800 | ||
c57943a1 PZ |
801 | return sk->sk_backlog_rcv(sk, skb); |
802 | } | |
803 | ||
c58dc01b DM |
804 | static inline void sock_rps_record_flow(const struct sock *sk) |
805 | { | |
806 | #ifdef CONFIG_RPS | |
807 | struct rps_sock_flow_table *sock_flow_table; | |
808 | ||
809 | rcu_read_lock(); | |
810 | sock_flow_table = rcu_dereference(rps_sock_flow_table); | |
811 | rps_record_sock_flow(sock_flow_table, sk->sk_rxhash); | |
812 | rcu_read_unlock(); | |
813 | #endif | |
814 | } | |
815 | ||
816 | static inline void sock_rps_reset_flow(const struct sock *sk) | |
817 | { | |
818 | #ifdef CONFIG_RPS | |
819 | struct rps_sock_flow_table *sock_flow_table; | |
820 | ||
821 | rcu_read_lock(); | |
822 | sock_flow_table = rcu_dereference(rps_sock_flow_table); | |
823 | rps_reset_sock_flow(sock_flow_table, sk->sk_rxhash); | |
824 | rcu_read_unlock(); | |
825 | #endif | |
826 | } | |
827 | ||
bdeab991 TH |
828 | static inline void sock_rps_save_rxhash(struct sock *sk, |
829 | const struct sk_buff *skb) | |
c58dc01b DM |
830 | { |
831 | #ifdef CONFIG_RPS | |
bdeab991 | 832 | if (unlikely(sk->sk_rxhash != skb->rxhash)) { |
c58dc01b | 833 | sock_rps_reset_flow(sk); |
bdeab991 | 834 | sk->sk_rxhash = skb->rxhash; |
c58dc01b DM |
835 | } |
836 | #endif | |
837 | } | |
838 | ||
bdeab991 TH |
839 | static inline void sock_rps_reset_rxhash(struct sock *sk) |
840 | { | |
841 | #ifdef CONFIG_RPS | |
842 | sock_rps_reset_flow(sk); | |
843 | sk->sk_rxhash = 0; | |
844 | #endif | |
845 | } | |
846 | ||
cfcabdcc SH |
847 | #define sk_wait_event(__sk, __timeo, __condition) \ |
848 | ({ int __rc; \ | |
849 | release_sock(__sk); \ | |
850 | __rc = __condition; \ | |
851 | if (!__rc) { \ | |
852 | *(__timeo) = schedule_timeout(*(__timeo)); \ | |
853 | } \ | |
854 | lock_sock(__sk); \ | |
855 | __rc = __condition; \ | |
856 | __rc; \ | |
857 | }) | |
1da177e4 LT |
858 | |
859 | extern int sk_stream_wait_connect(struct sock *sk, long *timeo_p); | |
860 | extern int sk_stream_wait_memory(struct sock *sk, long *timeo_p); | |
861 | extern void sk_stream_wait_close(struct sock *sk, long timeo_p); | |
862 | extern int sk_stream_error(struct sock *sk, int flags, int err); | |
863 | extern void sk_stream_kill_queues(struct sock *sk); | |
7cb02404 MG |
864 | extern void sk_set_memalloc(struct sock *sk); |
865 | extern void sk_clear_memalloc(struct sock *sk); | |
1da177e4 LT |
866 | |
867 | extern int sk_wait_data(struct sock *sk, long *timeo); | |
868 | ||
60236fdd | 869 | struct request_sock_ops; |
6d6ee43e | 870 | struct timewait_sock_ops; |
ab1e0a13 | 871 | struct inet_hashinfo; |
fc8717ba | 872 | struct raw_hashinfo; |
de477254 | 873 | struct module; |
2e6599cb | 874 | |
f77d6021 ED |
875 | /* |
876 | * caches using SLAB_DESTROY_BY_RCU should let .next pointer from nulls nodes | |
877 | * un-modified. Special care is taken when initializing object to zero. | |
878 | */ | |
879 | static inline void sk_prot_clear_nulls(struct sock *sk, int size) | |
880 | { | |
881 | if (offsetof(struct sock, sk_node.next) != 0) | |
882 | memset(sk, 0, offsetof(struct sock, sk_node.next)); | |
883 | memset(&sk->sk_node.pprev, 0, | |
884 | size - offsetof(struct sock, sk_node.pprev)); | |
885 | } | |
886 | ||
1da177e4 LT |
887 | /* Networking protocol blocks we attach to sockets. |
888 | * socket layer -> transport layer interface | |
889 | * transport -> network interface is defined by struct inet_proto | |
890 | */ | |
891 | struct proto { | |
dc6b9b78 | 892 | void (*close)(struct sock *sk, |
1da177e4 LT |
893 | long timeout); |
894 | int (*connect)(struct sock *sk, | |
dc6b9b78 | 895 | struct sockaddr *uaddr, |
1da177e4 LT |
896 | int addr_len); |
897 | int (*disconnect)(struct sock *sk, int flags); | |
898 | ||
dc6b9b78 | 899 | struct sock * (*accept)(struct sock *sk, int flags, int *err); |
1da177e4 LT |
900 | |
901 | int (*ioctl)(struct sock *sk, int cmd, | |
902 | unsigned long arg); | |
903 | int (*init)(struct sock *sk); | |
7d06b2e0 | 904 | void (*destroy)(struct sock *sk); |
1da177e4 | 905 | void (*shutdown)(struct sock *sk, int how); |
dc6b9b78 | 906 | int (*setsockopt)(struct sock *sk, int level, |
1da177e4 | 907 | int optname, char __user *optval, |
b7058842 | 908 | unsigned int optlen); |
dc6b9b78 ED |
909 | int (*getsockopt)(struct sock *sk, int level, |
910 | int optname, char __user *optval, | |
911 | int __user *option); | |
af01d537 | 912 | #ifdef CONFIG_COMPAT |
3fdadf7d DM |
913 | int (*compat_setsockopt)(struct sock *sk, |
914 | int level, | |
915 | int optname, char __user *optval, | |
b7058842 | 916 | unsigned int optlen); |
3fdadf7d DM |
917 | int (*compat_getsockopt)(struct sock *sk, |
918 | int level, | |
919 | int optname, char __user *optval, | |
920 | int __user *option); | |
709b46e8 EB |
921 | int (*compat_ioctl)(struct sock *sk, |
922 | unsigned int cmd, unsigned long arg); | |
af01d537 | 923 | #endif |
1da177e4 LT |
924 | int (*sendmsg)(struct kiocb *iocb, struct sock *sk, |
925 | struct msghdr *msg, size_t len); | |
926 | int (*recvmsg)(struct kiocb *iocb, struct sock *sk, | |
927 | struct msghdr *msg, | |
dc6b9b78 ED |
928 | size_t len, int noblock, int flags, |
929 | int *addr_len); | |
1da177e4 LT |
930 | int (*sendpage)(struct sock *sk, struct page *page, |
931 | int offset, size_t size, int flags); | |
dc6b9b78 | 932 | int (*bind)(struct sock *sk, |
1da177e4 LT |
933 | struct sockaddr *uaddr, int addr_len); |
934 | ||
dc6b9b78 | 935 | int (*backlog_rcv) (struct sock *sk, |
1da177e4 LT |
936 | struct sk_buff *skb); |
937 | ||
46d3ceab | 938 | void (*release_cb)(struct sock *sk); |
563d34d0 | 939 | void (*mtu_reduced)(struct sock *sk); |
46d3ceab | 940 | |
1da177e4 LT |
941 | /* Keeping track of sk's, looking them up, and port selection methods. */ |
942 | void (*hash)(struct sock *sk); | |
943 | void (*unhash)(struct sock *sk); | |
719f8358 | 944 | void (*rehash)(struct sock *sk); |
1da177e4 | 945 | int (*get_port)(struct sock *sk, unsigned short snum); |
fcbdf09d | 946 | void (*clear_sk)(struct sock *sk, int size); |
1da177e4 | 947 | |
286ab3d4 | 948 | /* Keeping track of sockets in use */ |
65f76517 | 949 | #ifdef CONFIG_PROC_FS |
13ff3d6f | 950 | unsigned int inuse_idx; |
65f76517 | 951 | #endif |
ebb53d75 | 952 | |
1da177e4 | 953 | /* Memory pressure */ |
5c52ba17 | 954 | void (*enter_memory_pressure)(struct sock *sk); |
8d987e5c | 955 | atomic_long_t *memory_allocated; /* Current allocated memory. */ |
1748376b | 956 | struct percpu_counter *sockets_allocated; /* Current number of sockets. */ |
1da177e4 LT |
957 | /* |
958 | * Pressure flag: try to collapse. | |
959 | * Technical note: it is used by multiple contexts non atomically. | |
3ab224be | 960 | * All the __sk_mem_schedule() is of this nature: accounting |
1da177e4 LT |
961 | * is strict, actions are advisory and have some latency. |
962 | */ | |
963 | int *memory_pressure; | |
8d987e5c | 964 | long *sysctl_mem; |
1da177e4 LT |
965 | int *sysctl_wmem; |
966 | int *sysctl_rmem; | |
967 | int max_header; | |
7ba42910 | 968 | bool no_autobind; |
1da177e4 | 969 | |
271b72c7 | 970 | struct kmem_cache *slab; |
1da177e4 | 971 | unsigned int obj_size; |
271b72c7 | 972 | int slab_flags; |
1da177e4 | 973 | |
dd24c001 | 974 | struct percpu_counter *orphan_count; |
8feaf0c0 | 975 | |
60236fdd | 976 | struct request_sock_ops *rsk_prot; |
6d6ee43e | 977 | struct timewait_sock_ops *twsk_prot; |
2e6599cb | 978 | |
39d8cda7 PE |
979 | union { |
980 | struct inet_hashinfo *hashinfo; | |
645ca708 | 981 | struct udp_table *udp_table; |
fc8717ba | 982 | struct raw_hashinfo *raw_hash; |
39d8cda7 | 983 | } h; |
ab1e0a13 | 984 | |
1da177e4 LT |
985 | struct module *owner; |
986 | ||
987 | char name[32]; | |
988 | ||
989 | struct list_head node; | |
e6848976 ACM |
990 | #ifdef SOCK_REFCNT_DEBUG |
991 | atomic_t socks; | |
992 | #endif | |
c255a458 | 993 | #ifdef CONFIG_MEMCG_KMEM |
e1aab161 GC |
994 | /* |
995 | * cgroup specific init/deinit functions. Called once for all | |
996 | * protocols that implement it, from cgroups populate function. | |
997 | * This function has to setup any files the protocol want to | |
998 | * appear in the kmem cgroup filesystem. | |
999 | */ | |
1d62e436 | 1000 | int (*init_cgroup)(struct mem_cgroup *memcg, |
e1aab161 | 1001 | struct cgroup_subsys *ss); |
1d62e436 | 1002 | void (*destroy_cgroup)(struct mem_cgroup *memcg); |
e1aab161 GC |
1003 | struct cg_proto *(*proto_cgroup)(struct mem_cgroup *memcg); |
1004 | #endif | |
1005 | }; | |
1006 | ||
3f134619 GC |
1007 | /* |
1008 | * Bits in struct cg_proto.flags | |
1009 | */ | |
1010 | enum cg_proto_flags { | |
1011 | /* Currently active and new sockets should be assigned to cgroups */ | |
1012 | MEMCG_SOCK_ACTIVE, | |
1013 | /* It was ever activated; we must disarm static keys on destruction */ | |
1014 | MEMCG_SOCK_ACTIVATED, | |
1015 | }; | |
1016 | ||
e1aab161 GC |
1017 | struct cg_proto { |
1018 | void (*enter_memory_pressure)(struct sock *sk); | |
1019 | struct res_counter *memory_allocated; /* Current allocated memory. */ | |
1020 | struct percpu_counter *sockets_allocated; /* Current number of sockets. */ | |
1021 | int *memory_pressure; | |
1022 | long *sysctl_mem; | |
3f134619 | 1023 | unsigned long flags; |
e1aab161 GC |
1024 | /* |
1025 | * memcg field is used to find which memcg we belong directly | |
1026 | * Each memcg struct can hold more than one cg_proto, so container_of | |
1027 | * won't really cut. | |
1028 | * | |
1029 | * The elegant solution would be having an inverse function to | |
1030 | * proto_cgroup in struct proto, but that means polluting the structure | |
1031 | * for everybody, instead of just for memcg users. | |
1032 | */ | |
1033 | struct mem_cgroup *memcg; | |
1da177e4 LT |
1034 | }; |
1035 | ||
1036 | extern int proto_register(struct proto *prot, int alloc_slab); | |
1037 | extern void proto_unregister(struct proto *prot); | |
1038 | ||
3f134619 GC |
1039 | static inline bool memcg_proto_active(struct cg_proto *cg_proto) |
1040 | { | |
1041 | return test_bit(MEMCG_SOCK_ACTIVE, &cg_proto->flags); | |
1042 | } | |
1043 | ||
1044 | static inline bool memcg_proto_activated(struct cg_proto *cg_proto) | |
1045 | { | |
1046 | return test_bit(MEMCG_SOCK_ACTIVATED, &cg_proto->flags); | |
1047 | } | |
1048 | ||
e6848976 ACM |
1049 | #ifdef SOCK_REFCNT_DEBUG |
1050 | static inline void sk_refcnt_debug_inc(struct sock *sk) | |
1051 | { | |
1052 | atomic_inc(&sk->sk_prot->socks); | |
1053 | } | |
1054 | ||
1055 | static inline void sk_refcnt_debug_dec(struct sock *sk) | |
1056 | { | |
1057 | atomic_dec(&sk->sk_prot->socks); | |
1058 | printk(KERN_DEBUG "%s socket %p released, %d are still alive\n", | |
1059 | sk->sk_prot->name, sk, atomic_read(&sk->sk_prot->socks)); | |
1060 | } | |
1061 | ||
dec34fb0 | 1062 | static inline void sk_refcnt_debug_release(const struct sock *sk) |
e6848976 ACM |
1063 | { |
1064 | if (atomic_read(&sk->sk_refcnt) != 1) | |
1065 | printk(KERN_DEBUG "Destruction of the %s socket %p delayed, refcnt=%d\n", | |
1066 | sk->sk_prot->name, sk, atomic_read(&sk->sk_refcnt)); | |
1067 | } | |
1068 | #else /* SOCK_REFCNT_DEBUG */ | |
1069 | #define sk_refcnt_debug_inc(sk) do { } while (0) | |
1070 | #define sk_refcnt_debug_dec(sk) do { } while (0) | |
1071 | #define sk_refcnt_debug_release(sk) do { } while (0) | |
1072 | #endif /* SOCK_REFCNT_DEBUG */ | |
1073 | ||
c255a458 | 1074 | #if defined(CONFIG_MEMCG_KMEM) && defined(CONFIG_NET) |
c5905afb | 1075 | extern struct static_key memcg_socket_limit_enabled; |
e1aab161 GC |
1076 | static inline struct cg_proto *parent_cg_proto(struct proto *proto, |
1077 | struct cg_proto *cg_proto) | |
1078 | { | |
1079 | return proto->proto_cgroup(parent_mem_cgroup(cg_proto->memcg)); | |
1080 | } | |
c5905afb | 1081 | #define mem_cgroup_sockets_enabled static_key_false(&memcg_socket_limit_enabled) |
e1aab161 GC |
1082 | #else |
1083 | #define mem_cgroup_sockets_enabled 0 | |
1084 | static inline struct cg_proto *parent_cg_proto(struct proto *proto, | |
1085 | struct cg_proto *cg_proto) | |
1086 | { | |
1087 | return NULL; | |
1088 | } | |
1089 | #endif | |
1090 | ||
1091 | ||
180d8cd9 GC |
1092 | static inline bool sk_has_memory_pressure(const struct sock *sk) |
1093 | { | |
1094 | return sk->sk_prot->memory_pressure != NULL; | |
1095 | } | |
1096 | ||
1097 | static inline bool sk_under_memory_pressure(const struct sock *sk) | |
1098 | { | |
1099 | if (!sk->sk_prot->memory_pressure) | |
1100 | return false; | |
e1aab161 GC |
1101 | |
1102 | if (mem_cgroup_sockets_enabled && sk->sk_cgrp) | |
1103 | return !!*sk->sk_cgrp->memory_pressure; | |
1104 | ||
180d8cd9 GC |
1105 | return !!*sk->sk_prot->memory_pressure; |
1106 | } | |
1107 | ||
1108 | static inline void sk_leave_memory_pressure(struct sock *sk) | |
1109 | { | |
1110 | int *memory_pressure = sk->sk_prot->memory_pressure; | |
1111 | ||
e1aab161 GC |
1112 | if (!memory_pressure) |
1113 | return; | |
1114 | ||
1115 | if (*memory_pressure) | |
180d8cd9 | 1116 | *memory_pressure = 0; |
e1aab161 GC |
1117 | |
1118 | if (mem_cgroup_sockets_enabled && sk->sk_cgrp) { | |
1119 | struct cg_proto *cg_proto = sk->sk_cgrp; | |
1120 | struct proto *prot = sk->sk_prot; | |
1121 | ||
1122 | for (; cg_proto; cg_proto = parent_cg_proto(prot, cg_proto)) | |
1123 | if (*cg_proto->memory_pressure) | |
1124 | *cg_proto->memory_pressure = 0; | |
1125 | } | |
1126 | ||
180d8cd9 GC |
1127 | } |
1128 | ||
1129 | static inline void sk_enter_memory_pressure(struct sock *sk) | |
1130 | { | |
e1aab161 GC |
1131 | if (!sk->sk_prot->enter_memory_pressure) |
1132 | return; | |
1133 | ||
1134 | if (mem_cgroup_sockets_enabled && sk->sk_cgrp) { | |
1135 | struct cg_proto *cg_proto = sk->sk_cgrp; | |
1136 | struct proto *prot = sk->sk_prot; | |
1137 | ||
1138 | for (; cg_proto; cg_proto = parent_cg_proto(prot, cg_proto)) | |
1139 | cg_proto->enter_memory_pressure(sk); | |
1140 | } | |
1141 | ||
1142 | sk->sk_prot->enter_memory_pressure(sk); | |
180d8cd9 GC |
1143 | } |
1144 | ||
1145 | static inline long sk_prot_mem_limits(const struct sock *sk, int index) | |
1146 | { | |
1147 | long *prot = sk->sk_prot->sysctl_mem; | |
e1aab161 GC |
1148 | if (mem_cgroup_sockets_enabled && sk->sk_cgrp) |
1149 | prot = sk->sk_cgrp->sysctl_mem; | |
180d8cd9 GC |
1150 | return prot[index]; |
1151 | } | |
1152 | ||
e1aab161 GC |
1153 | static inline void memcg_memory_allocated_add(struct cg_proto *prot, |
1154 | unsigned long amt, | |
1155 | int *parent_status) | |
1156 | { | |
1157 | struct res_counter *fail; | |
1158 | int ret; | |
1159 | ||
0e90b31f GC |
1160 | ret = res_counter_charge_nofail(prot->memory_allocated, |
1161 | amt << PAGE_SHIFT, &fail); | |
e1aab161 GC |
1162 | if (ret < 0) |
1163 | *parent_status = OVER_LIMIT; | |
1164 | } | |
1165 | ||
1166 | static inline void memcg_memory_allocated_sub(struct cg_proto *prot, | |
1167 | unsigned long amt) | |
1168 | { | |
1169 | res_counter_uncharge(prot->memory_allocated, amt << PAGE_SHIFT); | |
1170 | } | |
1171 | ||
1172 | static inline u64 memcg_memory_allocated_read(struct cg_proto *prot) | |
1173 | { | |
1174 | u64 ret; | |
1175 | ret = res_counter_read_u64(prot->memory_allocated, RES_USAGE); | |
1176 | return ret >> PAGE_SHIFT; | |
1177 | } | |
1178 | ||
180d8cd9 GC |
1179 | static inline long |
1180 | sk_memory_allocated(const struct sock *sk) | |
1181 | { | |
1182 | struct proto *prot = sk->sk_prot; | |
e1aab161 GC |
1183 | if (mem_cgroup_sockets_enabled && sk->sk_cgrp) |
1184 | return memcg_memory_allocated_read(sk->sk_cgrp); | |
1185 | ||
180d8cd9 GC |
1186 | return atomic_long_read(prot->memory_allocated); |
1187 | } | |
1188 | ||
1189 | static inline long | |
e1aab161 | 1190 | sk_memory_allocated_add(struct sock *sk, int amt, int *parent_status) |
180d8cd9 GC |
1191 | { |
1192 | struct proto *prot = sk->sk_prot; | |
e1aab161 GC |
1193 | |
1194 | if (mem_cgroup_sockets_enabled && sk->sk_cgrp) { | |
1195 | memcg_memory_allocated_add(sk->sk_cgrp, amt, parent_status); | |
1196 | /* update the root cgroup regardless */ | |
1197 | atomic_long_add_return(amt, prot->memory_allocated); | |
1198 | return memcg_memory_allocated_read(sk->sk_cgrp); | |
1199 | } | |
1200 | ||
180d8cd9 GC |
1201 | return atomic_long_add_return(amt, prot->memory_allocated); |
1202 | } | |
1203 | ||
1204 | static inline void | |
0e90b31f | 1205 | sk_memory_allocated_sub(struct sock *sk, int amt) |
180d8cd9 GC |
1206 | { |
1207 | struct proto *prot = sk->sk_prot; | |
e1aab161 | 1208 | |
0e90b31f | 1209 | if (mem_cgroup_sockets_enabled && sk->sk_cgrp) |
e1aab161 GC |
1210 | memcg_memory_allocated_sub(sk->sk_cgrp, amt); |
1211 | ||
180d8cd9 GC |
1212 | atomic_long_sub(amt, prot->memory_allocated); |
1213 | } | |
1214 | ||
1215 | static inline void sk_sockets_allocated_dec(struct sock *sk) | |
1216 | { | |
1217 | struct proto *prot = sk->sk_prot; | |
e1aab161 GC |
1218 | |
1219 | if (mem_cgroup_sockets_enabled && sk->sk_cgrp) { | |
1220 | struct cg_proto *cg_proto = sk->sk_cgrp; | |
1221 | ||
1222 | for (; cg_proto; cg_proto = parent_cg_proto(prot, cg_proto)) | |
1223 | percpu_counter_dec(cg_proto->sockets_allocated); | |
1224 | } | |
1225 | ||
180d8cd9 GC |
1226 | percpu_counter_dec(prot->sockets_allocated); |
1227 | } | |
1228 | ||
1229 | static inline void sk_sockets_allocated_inc(struct sock *sk) | |
1230 | { | |
1231 | struct proto *prot = sk->sk_prot; | |
e1aab161 GC |
1232 | |
1233 | if (mem_cgroup_sockets_enabled && sk->sk_cgrp) { | |
1234 | struct cg_proto *cg_proto = sk->sk_cgrp; | |
1235 | ||
1236 | for (; cg_proto; cg_proto = parent_cg_proto(prot, cg_proto)) | |
1237 | percpu_counter_inc(cg_proto->sockets_allocated); | |
1238 | } | |
1239 | ||
180d8cd9 GC |
1240 | percpu_counter_inc(prot->sockets_allocated); |
1241 | } | |
1242 | ||
1243 | static inline int | |
1244 | sk_sockets_allocated_read_positive(struct sock *sk) | |
1245 | { | |
1246 | struct proto *prot = sk->sk_prot; | |
1247 | ||
e1aab161 | 1248 | if (mem_cgroup_sockets_enabled && sk->sk_cgrp) |
518fbf9c | 1249 | return percpu_counter_read_positive(sk->sk_cgrp->sockets_allocated); |
e1aab161 | 1250 | |
518fbf9c | 1251 | return percpu_counter_read_positive(prot->sockets_allocated); |
180d8cd9 GC |
1252 | } |
1253 | ||
1254 | static inline int | |
1255 | proto_sockets_allocated_sum_positive(struct proto *prot) | |
1256 | { | |
1257 | return percpu_counter_sum_positive(prot->sockets_allocated); | |
1258 | } | |
1259 | ||
1260 | static inline long | |
1261 | proto_memory_allocated(struct proto *prot) | |
1262 | { | |
1263 | return atomic_long_read(prot->memory_allocated); | |
1264 | } | |
1265 | ||
1266 | static inline bool | |
1267 | proto_memory_pressure(struct proto *prot) | |
1268 | { | |
1269 | if (!prot->memory_pressure) | |
1270 | return false; | |
1271 | return !!*prot->memory_pressure; | |
1272 | } | |
1273 | ||
65f76517 ED |
1274 | |
1275 | #ifdef CONFIG_PROC_FS | |
1da177e4 | 1276 | /* Called with local bh disabled */ |
c29a0bc4 PE |
1277 | extern void sock_prot_inuse_add(struct net *net, struct proto *prot, int inc); |
1278 | extern int sock_prot_inuse_get(struct net *net, struct proto *proto); | |
65f76517 | 1279 | #else |
dc6b9b78 | 1280 | static inline void sock_prot_inuse_add(struct net *net, struct proto *prot, |
c29a0bc4 | 1281 | int inc) |
65f76517 ED |
1282 | { |
1283 | } | |
65f76517 ED |
1284 | #endif |
1285 | ||
1da177e4 | 1286 | |
614c6cb4 ACM |
1287 | /* With per-bucket locks this operation is not-atomic, so that |
1288 | * this version is not worse. | |
1289 | */ | |
1290 | static inline void __sk_prot_rehash(struct sock *sk) | |
1291 | { | |
1292 | sk->sk_prot->unhash(sk); | |
1293 | sk->sk_prot->hash(sk); | |
1294 | } | |
1295 | ||
fcbdf09d OP |
1296 | void sk_prot_clear_portaddr_nulls(struct sock *sk, int size); |
1297 | ||
1da177e4 LT |
1298 | /* About 10 seconds */ |
1299 | #define SOCK_DESTROY_TIME (10*HZ) | |
1300 | ||
1301 | /* Sockets 0-1023 can't be bound to unless you are superuser */ | |
1302 | #define PROT_SOCK 1024 | |
1303 | ||
1304 | #define SHUTDOWN_MASK 3 | |
1305 | #define RCV_SHUTDOWN 1 | |
1306 | #define SEND_SHUTDOWN 2 | |
1307 | ||
1308 | #define SOCK_SNDBUF_LOCK 1 | |
1309 | #define SOCK_RCVBUF_LOCK 2 | |
1310 | #define SOCK_BINDADDR_LOCK 4 | |
1311 | #define SOCK_BINDPORT_LOCK 8 | |
1312 | ||
1313 | /* sock_iocb: used to kick off async processing of socket ios */ | |
1314 | struct sock_iocb { | |
1315 | struct list_head list; | |
1316 | ||
1317 | int flags; | |
1318 | int size; | |
1319 | struct socket *sock; | |
1320 | struct sock *sk; | |
1321 | struct scm_cookie *scm; | |
1322 | struct msghdr *msg, async_msg; | |
1da177e4 LT |
1323 | struct kiocb *kiocb; |
1324 | }; | |
1325 | ||
1326 | static inline struct sock_iocb *kiocb_to_siocb(struct kiocb *iocb) | |
1327 | { | |
1328 | return (struct sock_iocb *)iocb->private; | |
1329 | } | |
1330 | ||
1331 | static inline struct kiocb *siocb_to_kiocb(struct sock_iocb *si) | |
1332 | { | |
1333 | return si->kiocb; | |
1334 | } | |
1335 | ||
1336 | struct socket_alloc { | |
1337 | struct socket socket; | |
1338 | struct inode vfs_inode; | |
1339 | }; | |
1340 | ||
1341 | static inline struct socket *SOCKET_I(struct inode *inode) | |
1342 | { | |
1343 | return &container_of(inode, struct socket_alloc, vfs_inode)->socket; | |
1344 | } | |
1345 | ||
1346 | static inline struct inode *SOCK_INODE(struct socket *socket) | |
1347 | { | |
1348 | return &container_of(socket, struct socket_alloc, socket)->vfs_inode; | |
1349 | } | |
1350 | ||
3ab224be HA |
1351 | /* |
1352 | * Functions for memory accounting | |
1353 | */ | |
1354 | extern int __sk_mem_schedule(struct sock *sk, int size, int kind); | |
1355 | extern void __sk_mem_reclaim(struct sock *sk); | |
1da177e4 | 1356 | |
3ab224be HA |
1357 | #define SK_MEM_QUANTUM ((int)PAGE_SIZE) |
1358 | #define SK_MEM_QUANTUM_SHIFT ilog2(SK_MEM_QUANTUM) | |
1359 | #define SK_MEM_SEND 0 | |
1360 | #define SK_MEM_RECV 1 | |
1da177e4 | 1361 | |
3ab224be | 1362 | static inline int sk_mem_pages(int amt) |
1da177e4 | 1363 | { |
3ab224be | 1364 | return (amt + SK_MEM_QUANTUM - 1) >> SK_MEM_QUANTUM_SHIFT; |
1da177e4 LT |
1365 | } |
1366 | ||
dc6b9b78 | 1367 | static inline bool sk_has_account(struct sock *sk) |
1da177e4 | 1368 | { |
3ab224be HA |
1369 | /* return true if protocol supports memory accounting */ |
1370 | return !!sk->sk_prot->memory_allocated; | |
1da177e4 LT |
1371 | } |
1372 | ||
dc6b9b78 | 1373 | static inline bool sk_wmem_schedule(struct sock *sk, int size) |
1da177e4 | 1374 | { |
3ab224be | 1375 | if (!sk_has_account(sk)) |
dc6b9b78 | 1376 | return true; |
3ab224be HA |
1377 | return size <= sk->sk_forward_alloc || |
1378 | __sk_mem_schedule(sk, size, SK_MEM_SEND); | |
1da177e4 LT |
1379 | } |
1380 | ||
c76562b6 | 1381 | static inline bool |
35c448a8 | 1382 | sk_rmem_schedule(struct sock *sk, struct sk_buff *skb, int size) |
d80d99d6 | 1383 | { |
3ab224be | 1384 | if (!sk_has_account(sk)) |
dc6b9b78 | 1385 | return true; |
c76562b6 MG |
1386 | return size<= sk->sk_forward_alloc || |
1387 | __sk_mem_schedule(sk, size, SK_MEM_RECV) || | |
1388 | skb_pfmemalloc(skb); | |
3ab224be HA |
1389 | } |
1390 | ||
1391 | static inline void sk_mem_reclaim(struct sock *sk) | |
1392 | { | |
1393 | if (!sk_has_account(sk)) | |
1394 | return; | |
1395 | if (sk->sk_forward_alloc >= SK_MEM_QUANTUM) | |
1396 | __sk_mem_reclaim(sk); | |
1397 | } | |
1398 | ||
9993e7d3 DM |
1399 | static inline void sk_mem_reclaim_partial(struct sock *sk) |
1400 | { | |
1401 | if (!sk_has_account(sk)) | |
1402 | return; | |
1403 | if (sk->sk_forward_alloc > SK_MEM_QUANTUM) | |
1404 | __sk_mem_reclaim(sk); | |
1405 | } | |
1406 | ||
3ab224be HA |
1407 | static inline void sk_mem_charge(struct sock *sk, int size) |
1408 | { | |
1409 | if (!sk_has_account(sk)) | |
1410 | return; | |
1411 | sk->sk_forward_alloc -= size; | |
1412 | } | |
1413 | ||
1414 | static inline void sk_mem_uncharge(struct sock *sk, int size) | |
1415 | { | |
1416 | if (!sk_has_account(sk)) | |
1417 | return; | |
1418 | sk->sk_forward_alloc += size; | |
1419 | } | |
1420 | ||
1421 | static inline void sk_wmem_free_skb(struct sock *sk, struct sk_buff *skb) | |
1422 | { | |
3ab224be HA |
1423 | sock_set_flag(sk, SOCK_QUEUE_SHRUNK); |
1424 | sk->sk_wmem_queued -= skb->truesize; | |
1425 | sk_mem_uncharge(sk, skb->truesize); | |
1426 | __kfree_skb(skb); | |
d80d99d6 HX |
1427 | } |
1428 | ||
1da177e4 LT |
1429 | /* Used by processes to "lock" a socket state, so that |
1430 | * interrupts and bottom half handlers won't change it | |
1431 | * from under us. It essentially blocks any incoming | |
1432 | * packets, so that we won't get any new data or any | |
1433 | * packets that change the state of the socket. | |
1434 | * | |
1435 | * While locked, BH processing will add new packets to | |
1436 | * the backlog queue. This queue is processed by the | |
1437 | * owner of the socket lock right before it is released. | |
1438 | * | |
1439 | * Since ~2.3.5 it is also exclusive sleep lock serializing | |
1440 | * accesses from user process context. | |
1441 | */ | |
d2e9117c | 1442 | #define sock_owned_by_user(sk) ((sk)->sk_lock.owned) |
1da177e4 | 1443 | |
ed07536e PZ |
1444 | /* |
1445 | * Macro so as to not evaluate some arguments when | |
1446 | * lockdep is not enabled. | |
1447 | * | |
1448 | * Mark both the sk_lock and the sk_lock.slock as a | |
1449 | * per-address-family lock class. | |
1450 | */ | |
dc6b9b78 | 1451 | #define sock_lock_init_class_and_name(sk, sname, skey, name, key) \ |
ed07536e | 1452 | do { \ |
e8f6fbf6 | 1453 | sk->sk_lock.owned = 0; \ |
ed07536e PZ |
1454 | init_waitqueue_head(&sk->sk_lock.wq); \ |
1455 | spin_lock_init(&(sk)->sk_lock.slock); \ | |
1456 | debug_check_no_locks_freed((void *)&(sk)->sk_lock, \ | |
1457 | sizeof((sk)->sk_lock)); \ | |
1458 | lockdep_set_class_and_name(&(sk)->sk_lock.slock, \ | |
dc6b9b78 | 1459 | (skey), (sname)); \ |
ed07536e PZ |
1460 | lockdep_init_map(&(sk)->sk_lock.dep_map, (name), (key), 0); \ |
1461 | } while (0) | |
1462 | ||
41380930 | 1463 | extern void lock_sock_nested(struct sock *sk, int subclass); |
fcc70d5f PZ |
1464 | |
1465 | static inline void lock_sock(struct sock *sk) | |
1466 | { | |
1467 | lock_sock_nested(sk, 0); | |
1468 | } | |
1469 | ||
41380930 | 1470 | extern void release_sock(struct sock *sk); |
1da177e4 LT |
1471 | |
1472 | /* BH context may only use the following locking interface. */ | |
1473 | #define bh_lock_sock(__sk) spin_lock(&((__sk)->sk_lock.slock)) | |
c6366184 IM |
1474 | #define bh_lock_sock_nested(__sk) \ |
1475 | spin_lock_nested(&((__sk)->sk_lock.slock), \ | |
1476 | SINGLE_DEPTH_NESTING) | |
1da177e4 LT |
1477 | #define bh_unlock_sock(__sk) spin_unlock(&((__sk)->sk_lock.slock)) |
1478 | ||
8a74ad60 ED |
1479 | extern bool lock_sock_fast(struct sock *sk); |
1480 | /** | |
1481 | * unlock_sock_fast - complement of lock_sock_fast | |
1482 | * @sk: socket | |
1483 | * @slow: slow mode | |
1484 | * | |
1485 | * fast unlock socket for user context. | |
1486 | * If slow mode is on, we call regular release_sock() | |
1487 | */ | |
1488 | static inline void unlock_sock_fast(struct sock *sk, bool slow) | |
4b0b72f7 | 1489 | { |
8a74ad60 ED |
1490 | if (slow) |
1491 | release_sock(sk); | |
1492 | else | |
1493 | spin_unlock_bh(&sk->sk_lock.slock); | |
4b0b72f7 ED |
1494 | } |
1495 | ||
4b0b72f7 | 1496 | |
1b8d7ae4 | 1497 | extern struct sock *sk_alloc(struct net *net, int family, |
dd0fc66f | 1498 | gfp_t priority, |
6257ff21 | 1499 | struct proto *prot); |
1da177e4 | 1500 | extern void sk_free(struct sock *sk); |
edf02087 | 1501 | extern void sk_release_kernel(struct sock *sk); |
e56c57d0 ED |
1502 | extern struct sock *sk_clone_lock(const struct sock *sk, |
1503 | const gfp_t priority); | |
1da177e4 LT |
1504 | |
1505 | extern struct sk_buff *sock_wmalloc(struct sock *sk, | |
1506 | unsigned long size, int force, | |
dd0fc66f | 1507 | gfp_t priority); |
1da177e4 LT |
1508 | extern struct sk_buff *sock_rmalloc(struct sock *sk, |
1509 | unsigned long size, int force, | |
dd0fc66f | 1510 | gfp_t priority); |
1da177e4 LT |
1511 | extern void sock_wfree(struct sk_buff *skb); |
1512 | extern void sock_rfree(struct sk_buff *skb); | |
41063e9d | 1513 | extern void sock_edemux(struct sk_buff *skb); |
1da177e4 LT |
1514 | |
1515 | extern int sock_setsockopt(struct socket *sock, int level, | |
1516 | int op, char __user *optval, | |
b7058842 | 1517 | unsigned int optlen); |
1da177e4 LT |
1518 | |
1519 | extern int sock_getsockopt(struct socket *sock, int level, | |
dc6b9b78 | 1520 | int op, char __user *optval, |
1da177e4 | 1521 | int __user *optlen); |
dc6b9b78 | 1522 | extern struct sk_buff *sock_alloc_send_skb(struct sock *sk, |
1da177e4 LT |
1523 | unsigned long size, |
1524 | int noblock, | |
1525 | int *errcode); | |
dc6b9b78 | 1526 | extern struct sk_buff *sock_alloc_send_pskb(struct sock *sk, |
4cc7f68d HX |
1527 | unsigned long header_len, |
1528 | unsigned long data_len, | |
1529 | int noblock, | |
1530 | int *errcode); | |
86a76caf | 1531 | extern void *sock_kmalloc(struct sock *sk, int size, |
dd0fc66f | 1532 | gfp_t priority); |
1da177e4 LT |
1533 | extern void sock_kfree_s(struct sock *sk, void *mem, int size); |
1534 | extern void sk_send_sigurg(struct sock *sk); | |
1535 | ||
1536 | /* | |
1537 | * Functions to fill in entries in struct proto_ops when a protocol | |
1538 | * does not implement a particular function. | |
1539 | */ | |
dc6b9b78 | 1540 | extern int sock_no_bind(struct socket *, |
1da177e4 LT |
1541 | struct sockaddr *, int); |
1542 | extern int sock_no_connect(struct socket *, | |
1543 | struct sockaddr *, int, int); | |
1544 | extern int sock_no_socketpair(struct socket *, | |
1545 | struct socket *); | |
1546 | extern int sock_no_accept(struct socket *, | |
1547 | struct socket *, int); | |
1548 | extern int sock_no_getname(struct socket *, | |
1549 | struct sockaddr *, int *, int); | |
1550 | extern unsigned int sock_no_poll(struct file *, struct socket *, | |
1551 | struct poll_table_struct *); | |
1552 | extern int sock_no_ioctl(struct socket *, unsigned int, | |
1553 | unsigned long); | |
1554 | extern int sock_no_listen(struct socket *, int); | |
1555 | extern int sock_no_shutdown(struct socket *, int); | |
1556 | extern int sock_no_getsockopt(struct socket *, int , int, | |
1557 | char __user *, int __user *); | |
1558 | extern int sock_no_setsockopt(struct socket *, int, int, | |
b7058842 | 1559 | char __user *, unsigned int); |
1da177e4 LT |
1560 | extern int sock_no_sendmsg(struct kiocb *, struct socket *, |
1561 | struct msghdr *, size_t); | |
1562 | extern int sock_no_recvmsg(struct kiocb *, struct socket *, | |
1563 | struct msghdr *, size_t, int); | |
1564 | extern int sock_no_mmap(struct file *file, | |
1565 | struct socket *sock, | |
1566 | struct vm_area_struct *vma); | |
1567 | extern ssize_t sock_no_sendpage(struct socket *sock, | |
1568 | struct page *page, | |
dc6b9b78 | 1569 | int offset, size_t size, |
1da177e4 LT |
1570 | int flags); |
1571 | ||
1572 | /* | |
1573 | * Functions to fill in entries in struct proto_ops when a protocol | |
1574 | * uses the inet style. | |
1575 | */ | |
1576 | extern int sock_common_getsockopt(struct socket *sock, int level, int optname, | |
1577 | char __user *optval, int __user *optlen); | |
1578 | extern int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock, | |
1579 | struct msghdr *msg, size_t size, int flags); | |
1580 | extern int sock_common_setsockopt(struct socket *sock, int level, int optname, | |
b7058842 | 1581 | char __user *optval, unsigned int optlen); |
3fdadf7d DM |
1582 | extern int compat_sock_common_getsockopt(struct socket *sock, int level, |
1583 | int optname, char __user *optval, int __user *optlen); | |
1584 | extern int compat_sock_common_setsockopt(struct socket *sock, int level, | |
b7058842 | 1585 | int optname, char __user *optval, unsigned int optlen); |
1da177e4 LT |
1586 | |
1587 | extern void sk_common_release(struct sock *sk); | |
1588 | ||
1589 | /* | |
1590 | * Default socket callbacks and setup code | |
1591 | */ | |
dc6b9b78 | 1592 | |
1da177e4 LT |
1593 | /* Initialise core socket variables */ |
1594 | extern void sock_init_data(struct socket *sock, struct sock *sk); | |
1595 | ||
46bcf14f ED |
1596 | extern void sk_filter_release_rcu(struct rcu_head *rcu); |
1597 | ||
dc9b3346 | 1598 | /** |
1a5778aa | 1599 | * sk_filter_release - release a socket filter |
dc9b3346 PB |
1600 | * @fp: filter to remove |
1601 | * | |
1602 | * Remove a filter from a socket and release its resources. | |
1603 | */ | |
1604 | ||
309dd5fc PE |
1605 | static inline void sk_filter_release(struct sk_filter *fp) |
1606 | { | |
1607 | if (atomic_dec_and_test(&fp->refcnt)) | |
80f8f102 | 1608 | call_rcu(&fp->rcu, sk_filter_release_rcu); |
309dd5fc PE |
1609 | } |
1610 | ||
1611 | static inline void sk_filter_uncharge(struct sock *sk, struct sk_filter *fp) | |
1da177e4 LT |
1612 | { |
1613 | unsigned int size = sk_filter_len(fp); | |
1614 | ||
1615 | atomic_sub(size, &sk->sk_omem_alloc); | |
309dd5fc | 1616 | sk_filter_release(fp); |
1da177e4 LT |
1617 | } |
1618 | ||
1619 | static inline void sk_filter_charge(struct sock *sk, struct sk_filter *fp) | |
1620 | { | |
1621 | atomic_inc(&fp->refcnt); | |
1622 | atomic_add(sk_filter_len(fp), &sk->sk_omem_alloc); | |
1623 | } | |
1624 | ||
1625 | /* | |
1626 | * Socket reference counting postulates. | |
1627 | * | |
1628 | * * Each user of socket SHOULD hold a reference count. | |
1629 | * * Each access point to socket (an hash table bucket, reference from a list, | |
1630 | * running timer, skb in flight MUST hold a reference count. | |
1631 | * * When reference count hits 0, it means it will never increase back. | |
1632 | * * When reference count hits 0, it means that no references from | |
1633 | * outside exist to this socket and current process on current CPU | |
1634 | * is last user and may/should destroy this socket. | |
1635 | * * sk_free is called from any context: process, BH, IRQ. When | |
1636 | * it is called, socket has no references from outside -> sk_free | |
1637 | * may release descendant resources allocated by the socket, but | |
1638 | * to the time when it is called, socket is NOT referenced by any | |
1639 | * hash tables, lists etc. | |
1640 | * * Packets, delivered from outside (from network or from another process) | |
1641 | * and enqueued on receive/error queues SHOULD NOT grab reference count, | |
1642 | * when they sit in queue. Otherwise, packets will leak to hole, when | |
1643 | * socket is looked up by one cpu and unhasing is made by another CPU. | |
1644 | * It is true for udp/raw, netlink (leak to receive and error queues), tcp | |
1645 | * (leak to backlog). Packet socket does all the processing inside | |
1646 | * BR_NETPROTO_LOCK, so that it has not this race condition. UNIX sockets | |
1647 | * use separate SMP lock, so that they are prone too. | |
1648 | */ | |
1649 | ||
1650 | /* Ungrab socket and destroy it, if it was the last reference. */ | |
1651 | static inline void sock_put(struct sock *sk) | |
1652 | { | |
1653 | if (atomic_dec_and_test(&sk->sk_refcnt)) | |
1654 | sk_free(sk); | |
1655 | } | |
1656 | ||
58a5a7b9 ACM |
1657 | extern int sk_receive_skb(struct sock *sk, struct sk_buff *skb, |
1658 | const int nested); | |
25995ff5 | 1659 | |
e022f0b4 KK |
1660 | static inline void sk_tx_queue_set(struct sock *sk, int tx_queue) |
1661 | { | |
1662 | sk->sk_tx_queue_mapping = tx_queue; | |
1663 | } | |
1664 | ||
1665 | static inline void sk_tx_queue_clear(struct sock *sk) | |
1666 | { | |
1667 | sk->sk_tx_queue_mapping = -1; | |
1668 | } | |
1669 | ||
1670 | static inline int sk_tx_queue_get(const struct sock *sk) | |
1671 | { | |
b0f77d0e | 1672 | return sk ? sk->sk_tx_queue_mapping : -1; |
e022f0b4 KK |
1673 | } |
1674 | ||
972692e0 DM |
1675 | static inline void sk_set_socket(struct sock *sk, struct socket *sock) |
1676 | { | |
e022f0b4 | 1677 | sk_tx_queue_clear(sk); |
972692e0 DM |
1678 | sk->sk_socket = sock; |
1679 | } | |
1680 | ||
aa395145 ED |
1681 | static inline wait_queue_head_t *sk_sleep(struct sock *sk) |
1682 | { | |
eaefd110 ED |
1683 | BUILD_BUG_ON(offsetof(struct socket_wq, wait) != 0); |
1684 | return &rcu_dereference_raw(sk->sk_wq)->wait; | |
aa395145 | 1685 | } |
1da177e4 LT |
1686 | /* Detach socket from process context. |
1687 | * Announce socket dead, detach it from wait queue and inode. | |
1688 | * Note that parent inode held reference count on this struct sock, | |
1689 | * we do not release it in this function, because protocol | |
1690 | * probably wants some additional cleanups or even continuing | |
1691 | * to work with this socket (TCP). | |
1692 | */ | |
1693 | static inline void sock_orphan(struct sock *sk) | |
1694 | { | |
1695 | write_lock_bh(&sk->sk_callback_lock); | |
1696 | sock_set_flag(sk, SOCK_DEAD); | |
972692e0 | 1697 | sk_set_socket(sk, NULL); |
43815482 | 1698 | sk->sk_wq = NULL; |
1da177e4 LT |
1699 | write_unlock_bh(&sk->sk_callback_lock); |
1700 | } | |
1701 | ||
1702 | static inline void sock_graft(struct sock *sk, struct socket *parent) | |
1703 | { | |
1704 | write_lock_bh(&sk->sk_callback_lock); | |
eaefd110 | 1705 | sk->sk_wq = parent->wq; |
1da177e4 | 1706 | parent->sk = sk; |
972692e0 | 1707 | sk_set_socket(sk, parent); |
4237c75c | 1708 | security_sock_graft(sk, parent); |
1da177e4 LT |
1709 | write_unlock_bh(&sk->sk_callback_lock); |
1710 | } | |
1711 | ||
976d0201 | 1712 | extern kuid_t sock_i_uid(struct sock *sk); |
1da177e4 LT |
1713 | extern unsigned long sock_i_ino(struct sock *sk); |
1714 | ||
1715 | static inline struct dst_entry * | |
1716 | __sk_dst_get(struct sock *sk) | |
1717 | { | |
d8bf4ca9 | 1718 | return rcu_dereference_check(sk->sk_dst_cache, sock_owned_by_user(sk) || |
f68c224f | 1719 | lockdep_is_held(&sk->sk_lock.slock)); |
1da177e4 LT |
1720 | } |
1721 | ||
1722 | static inline struct dst_entry * | |
1723 | sk_dst_get(struct sock *sk) | |
1724 | { | |
1725 | struct dst_entry *dst; | |
1726 | ||
b6c6712a ED |
1727 | rcu_read_lock(); |
1728 | dst = rcu_dereference(sk->sk_dst_cache); | |
1da177e4 LT |
1729 | if (dst) |
1730 | dst_hold(dst); | |
b6c6712a | 1731 | rcu_read_unlock(); |
1da177e4 LT |
1732 | return dst; |
1733 | } | |
1734 | ||
b6c6712a ED |
1735 | extern void sk_reset_txq(struct sock *sk); |
1736 | ||
1737 | static inline void dst_negative_advice(struct sock *sk) | |
1738 | { | |
1739 | struct dst_entry *ndst, *dst = __sk_dst_get(sk); | |
1740 | ||
1741 | if (dst && dst->ops->negative_advice) { | |
1742 | ndst = dst->ops->negative_advice(dst); | |
1743 | ||
1744 | if (ndst != dst) { | |
1745 | rcu_assign_pointer(sk->sk_dst_cache, ndst); | |
1746 | sk_reset_txq(sk); | |
1747 | } | |
1748 | } | |
1749 | } | |
1750 | ||
1da177e4 LT |
1751 | static inline void |
1752 | __sk_dst_set(struct sock *sk, struct dst_entry *dst) | |
1753 | { | |
1754 | struct dst_entry *old_dst; | |
1755 | ||
e022f0b4 | 1756 | sk_tx_queue_clear(sk); |
0b53ff2e ED |
1757 | /* |
1758 | * This can be called while sk is owned by the caller only, | |
1759 | * with no state that can be checked in a rcu_dereference_check() cond | |
1760 | */ | |
1761 | old_dst = rcu_dereference_raw(sk->sk_dst_cache); | |
b6c6712a | 1762 | rcu_assign_pointer(sk->sk_dst_cache, dst); |
1da177e4 LT |
1763 | dst_release(old_dst); |
1764 | } | |
1765 | ||
1766 | static inline void | |
1767 | sk_dst_set(struct sock *sk, struct dst_entry *dst) | |
1768 | { | |
b6c6712a | 1769 | spin_lock(&sk->sk_dst_lock); |
1da177e4 | 1770 | __sk_dst_set(sk, dst); |
b6c6712a | 1771 | spin_unlock(&sk->sk_dst_lock); |
1da177e4 LT |
1772 | } |
1773 | ||
1774 | static inline void | |
1775 | __sk_dst_reset(struct sock *sk) | |
1776 | { | |
b6c6712a | 1777 | __sk_dst_set(sk, NULL); |
1da177e4 LT |
1778 | } |
1779 | ||
1780 | static inline void | |
1781 | sk_dst_reset(struct sock *sk) | |
1782 | { | |
b6c6712a | 1783 | spin_lock(&sk->sk_dst_lock); |
1da177e4 | 1784 | __sk_dst_reset(sk); |
b6c6712a | 1785 | spin_unlock(&sk->sk_dst_lock); |
1da177e4 LT |
1786 | } |
1787 | ||
f0088a50 | 1788 | extern struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie); |
1da177e4 | 1789 | |
f0088a50 | 1790 | extern struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie); |
1da177e4 | 1791 | |
dc6b9b78 | 1792 | static inline bool sk_can_gso(const struct sock *sk) |
bcd76111 HX |
1793 | { |
1794 | return net_gso_ok(sk->sk_route_caps, sk->sk_gso_type); | |
1795 | } | |
1796 | ||
9958089a | 1797 | extern void sk_setup_caps(struct sock *sk, struct dst_entry *dst); |
6cbb0df7 | 1798 | |
c8f44aff | 1799 | static inline void sk_nocaps_add(struct sock *sk, netdev_features_t flags) |
a465419b ED |
1800 | { |
1801 | sk->sk_route_nocaps |= flags; | |
1802 | sk->sk_route_caps &= ~flags; | |
1803 | } | |
1804 | ||
c6e1a0d1 TH |
1805 | static inline int skb_do_copy_data_nocache(struct sock *sk, struct sk_buff *skb, |
1806 | char __user *from, char *to, | |
912d398d | 1807 | int copy, int offset) |
c6e1a0d1 TH |
1808 | { |
1809 | if (skb->ip_summed == CHECKSUM_NONE) { | |
1810 | int err = 0; | |
1811 | __wsum csum = csum_and_copy_from_user(from, to, copy, 0, &err); | |
1812 | if (err) | |
1813 | return err; | |
912d398d | 1814 | skb->csum = csum_block_add(skb->csum, csum, offset); |
c6e1a0d1 TH |
1815 | } else if (sk->sk_route_caps & NETIF_F_NOCACHE_COPY) { |
1816 | if (!access_ok(VERIFY_READ, from, copy) || | |
1817 | __copy_from_user_nocache(to, from, copy)) | |
1818 | return -EFAULT; | |
1819 | } else if (copy_from_user(to, from, copy)) | |
1820 | return -EFAULT; | |
1821 | ||
1822 | return 0; | |
1823 | } | |
1824 | ||
1825 | static inline int skb_add_data_nocache(struct sock *sk, struct sk_buff *skb, | |
1826 | char __user *from, int copy) | |
1827 | { | |
912d398d | 1828 | int err, offset = skb->len; |
c6e1a0d1 | 1829 | |
912d398d WY |
1830 | err = skb_do_copy_data_nocache(sk, skb, from, skb_put(skb, copy), |
1831 | copy, offset); | |
c6e1a0d1 | 1832 | if (err) |
912d398d | 1833 | __skb_trim(skb, offset); |
c6e1a0d1 TH |
1834 | |
1835 | return err; | |
1836 | } | |
1837 | ||
1838 | static inline int skb_copy_to_page_nocache(struct sock *sk, char __user *from, | |
1839 | struct sk_buff *skb, | |
1840 | struct page *page, | |
1841 | int off, int copy) | |
1842 | { | |
1843 | int err; | |
1844 | ||
912d398d WY |
1845 | err = skb_do_copy_data_nocache(sk, skb, from, page_address(page) + off, |
1846 | copy, skb->len); | |
c6e1a0d1 TH |
1847 | if (err) |
1848 | return err; | |
1849 | ||
1850 | skb->len += copy; | |
1851 | skb->data_len += copy; | |
1852 | skb->truesize += copy; | |
1853 | sk->sk_wmem_queued += copy; | |
1854 | sk_mem_charge(sk, copy); | |
1855 | return 0; | |
1856 | } | |
1857 | ||
1da177e4 LT |
1858 | static inline int skb_copy_to_page(struct sock *sk, char __user *from, |
1859 | struct sk_buff *skb, struct page *page, | |
1860 | int off, int copy) | |
1861 | { | |
1862 | if (skb->ip_summed == CHECKSUM_NONE) { | |
1863 | int err = 0; | |
5084205f | 1864 | __wsum csum = csum_and_copy_from_user(from, |
1da177e4 LT |
1865 | page_address(page) + off, |
1866 | copy, 0, &err); | |
1867 | if (err) | |
1868 | return err; | |
1869 | skb->csum = csum_block_add(skb->csum, csum, skb->len); | |
1870 | } else if (copy_from_user(page_address(page) + off, from, copy)) | |
1871 | return -EFAULT; | |
1872 | ||
1873 | skb->len += copy; | |
1874 | skb->data_len += copy; | |
1875 | skb->truesize += copy; | |
1876 | sk->sk_wmem_queued += copy; | |
3ab224be | 1877 | sk_mem_charge(sk, copy); |
1da177e4 LT |
1878 | return 0; |
1879 | } | |
1880 | ||
c564039f ED |
1881 | /** |
1882 | * sk_wmem_alloc_get - returns write allocations | |
1883 | * @sk: socket | |
1884 | * | |
1885 | * Returns sk_wmem_alloc minus initial offset of one | |
1886 | */ | |
1887 | static inline int sk_wmem_alloc_get(const struct sock *sk) | |
1888 | { | |
1889 | return atomic_read(&sk->sk_wmem_alloc) - 1; | |
1890 | } | |
1891 | ||
1892 | /** | |
1893 | * sk_rmem_alloc_get - returns read allocations | |
1894 | * @sk: socket | |
1895 | * | |
1896 | * Returns sk_rmem_alloc | |
1897 | */ | |
1898 | static inline int sk_rmem_alloc_get(const struct sock *sk) | |
1899 | { | |
1900 | return atomic_read(&sk->sk_rmem_alloc); | |
1901 | } | |
1902 | ||
1903 | /** | |
1904 | * sk_has_allocations - check if allocations are outstanding | |
1905 | * @sk: socket | |
1906 | * | |
1907 | * Returns true if socket has write or read allocations | |
1908 | */ | |
dc6b9b78 | 1909 | static inline bool sk_has_allocations(const struct sock *sk) |
c564039f ED |
1910 | { |
1911 | return sk_wmem_alloc_get(sk) || sk_rmem_alloc_get(sk); | |
1912 | } | |
1913 | ||
a57de0b4 | 1914 | /** |
43815482 | 1915 | * wq_has_sleeper - check if there are any waiting processes |
acfbe96a | 1916 | * @wq: struct socket_wq |
a57de0b4 | 1917 | * |
43815482 | 1918 | * Returns true if socket_wq has waiting processes |
a57de0b4 | 1919 | * |
43815482 | 1920 | * The purpose of the wq_has_sleeper and sock_poll_wait is to wrap the memory |
a57de0b4 JO |
1921 | * barrier call. They were added due to the race found within the tcp code. |
1922 | * | |
1923 | * Consider following tcp code paths: | |
1924 | * | |
1925 | * CPU1 CPU2 | |
1926 | * | |
1927 | * sys_select receive packet | |
1928 | * ... ... | |
1929 | * __add_wait_queue update tp->rcv_nxt | |
1930 | * ... ... | |
1931 | * tp->rcv_nxt check sock_def_readable | |
1932 | * ... { | |
43815482 ED |
1933 | * schedule rcu_read_lock(); |
1934 | * wq = rcu_dereference(sk->sk_wq); | |
1935 | * if (wq && waitqueue_active(&wq->wait)) | |
1936 | * wake_up_interruptible(&wq->wait) | |
a57de0b4 JO |
1937 | * ... |
1938 | * } | |
1939 | * | |
1940 | * The race for tcp fires when the __add_wait_queue changes done by CPU1 stay | |
1941 | * in its cache, and so does the tp->rcv_nxt update on CPU2 side. The CPU1 | |
1942 | * could then endup calling schedule and sleep forever if there are no more | |
1943 | * data on the socket. | |
ad462769 | 1944 | * |
a57de0b4 | 1945 | */ |
43815482 | 1946 | static inline bool wq_has_sleeper(struct socket_wq *wq) |
a57de0b4 | 1947 | { |
dc6b9b78 | 1948 | /* We need to be sure we are in sync with the |
a57de0b4 JO |
1949 | * add_wait_queue modifications to the wait queue. |
1950 | * | |
1951 | * This memory barrier is paired in the sock_poll_wait. | |
1952 | */ | |
43815482 ED |
1953 | smp_mb(); |
1954 | return wq && waitqueue_active(&wq->wait); | |
a57de0b4 JO |
1955 | } |
1956 | ||
1957 | /** | |
1958 | * sock_poll_wait - place memory barrier behind the poll_wait call. | |
1959 | * @filp: file | |
1960 | * @wait_address: socket wait queue | |
1961 | * @p: poll_table | |
1962 | * | |
43815482 | 1963 | * See the comments in the wq_has_sleeper function. |
a57de0b4 JO |
1964 | */ |
1965 | static inline void sock_poll_wait(struct file *filp, | |
1966 | wait_queue_head_t *wait_address, poll_table *p) | |
1967 | { | |
626cf236 | 1968 | if (!poll_does_not_wait(p) && wait_address) { |
a57de0b4 | 1969 | poll_wait(filp, wait_address, p); |
dc6b9b78 | 1970 | /* We need to be sure we are in sync with the |
a57de0b4 JO |
1971 | * socket flags modification. |
1972 | * | |
43815482 | 1973 | * This memory barrier is paired in the wq_has_sleeper. |
dc6b9b78 | 1974 | */ |
a57de0b4 JO |
1975 | smp_mb(); |
1976 | } | |
1977 | } | |
1978 | ||
1da177e4 | 1979 | /* |
dc6b9b78 | 1980 | * Queue a received datagram if it will fit. Stream and sequenced |
1da177e4 LT |
1981 | * protocols can't normally use this as they need to fit buffers in |
1982 | * and play with them. | |
1983 | * | |
dc6b9b78 | 1984 | * Inlined as it's very short and called for pretty much every |
1da177e4 LT |
1985 | * packet ever received. |
1986 | */ | |
1987 | ||
1988 | static inline void skb_set_owner_w(struct sk_buff *skb, struct sock *sk) | |
1989 | { | |
d55d87fd | 1990 | skb_orphan(skb); |
1da177e4 LT |
1991 | skb->sk = sk; |
1992 | skb->destructor = sock_wfree; | |
2b85a34e ED |
1993 | /* |
1994 | * We used to take a refcount on sk, but following operation | |
1995 | * is enough to guarantee sk_free() wont free this sock until | |
1996 | * all in-flight packets are completed | |
1997 | */ | |
1da177e4 LT |
1998 | atomic_add(skb->truesize, &sk->sk_wmem_alloc); |
1999 | } | |
2000 | ||
2001 | static inline void skb_set_owner_r(struct sk_buff *skb, struct sock *sk) | |
2002 | { | |
d55d87fd | 2003 | skb_orphan(skb); |
1da177e4 LT |
2004 | skb->sk = sk; |
2005 | skb->destructor = sock_rfree; | |
2006 | atomic_add(skb->truesize, &sk->sk_rmem_alloc); | |
3ab224be | 2007 | sk_mem_charge(sk, skb->truesize); |
1da177e4 LT |
2008 | } |
2009 | ||
dc6b9b78 | 2010 | extern void sk_reset_timer(struct sock *sk, struct timer_list *timer, |
1da177e4 LT |
2011 | unsigned long expires); |
2012 | ||
dc6b9b78 | 2013 | extern void sk_stop_timer(struct sock *sk, struct timer_list *timer); |
1da177e4 | 2014 | |
f0088a50 | 2015 | extern int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb); |
1da177e4 | 2016 | |
b1faf566 | 2017 | extern int sock_queue_err_skb(struct sock *sk, struct sk_buff *skb); |
1da177e4 LT |
2018 | |
2019 | /* | |
2020 | * Recover an error report and clear atomically | |
2021 | */ | |
dc6b9b78 | 2022 | |
1da177e4 LT |
2023 | static inline int sock_error(struct sock *sk) |
2024 | { | |
c1cbe4b7 BL |
2025 | int err; |
2026 | if (likely(!sk->sk_err)) | |
2027 | return 0; | |
2028 | err = xchg(&sk->sk_err, 0); | |
1da177e4 LT |
2029 | return -err; |
2030 | } | |
2031 | ||
2032 | static inline unsigned long sock_wspace(struct sock *sk) | |
2033 | { | |
2034 | int amt = 0; | |
2035 | ||
2036 | if (!(sk->sk_shutdown & SEND_SHUTDOWN)) { | |
2037 | amt = sk->sk_sndbuf - atomic_read(&sk->sk_wmem_alloc); | |
dc6b9b78 | 2038 | if (amt < 0) |
1da177e4 LT |
2039 | amt = 0; |
2040 | } | |
2041 | return amt; | |
2042 | } | |
2043 | ||
2044 | static inline void sk_wake_async(struct sock *sk, int how, int band) | |
2045 | { | |
bcdce719 | 2046 | if (sock_flag(sk, SOCK_FASYNC)) |
1da177e4 LT |
2047 | sock_wake_async(sk->sk_socket, how, band); |
2048 | } | |
2049 | ||
eea86af6 DB |
2050 | /* Since sk_{r,w}mem_alloc sums skb->truesize, even a small frame might |
2051 | * need sizeof(sk_buff) + MTU + padding, unless net driver perform copybreak. | |
2052 | * Note: for send buffers, TCP works better if we can build two skbs at | |
2053 | * minimum. | |
7a91b434 | 2054 | */ |
9eb5bf83 | 2055 | #define TCP_SKB_MIN_TRUESIZE (2048 + SKB_DATA_ALIGN(sizeof(struct sk_buff))) |
eea86af6 DB |
2056 | |
2057 | #define SOCK_MIN_SNDBUF (TCP_SKB_MIN_TRUESIZE * 2) | |
2058 | #define SOCK_MIN_RCVBUF TCP_SKB_MIN_TRUESIZE | |
1da177e4 LT |
2059 | |
2060 | static inline void sk_stream_moderate_sndbuf(struct sock *sk) | |
2061 | { | |
2062 | if (!(sk->sk_userlocks & SOCK_SNDBUF_LOCK)) { | |
8df09ea3 | 2063 | sk->sk_sndbuf = min(sk->sk_sndbuf, sk->sk_wmem_queued >> 1); |
eea86af6 | 2064 | sk->sk_sndbuf = max_t(u32, sk->sk_sndbuf, SOCK_MIN_SNDBUF); |
1da177e4 LT |
2065 | } |
2066 | } | |
2067 | ||
df97c708 | 2068 | struct sk_buff *sk_stream_alloc_skb(struct sock *sk, int size, gfp_t gfp); |
1da177e4 | 2069 | |
5640f768 ED |
2070 | /** |
2071 | * sk_page_frag - return an appropriate page_frag | |
2072 | * @sk: socket | |
2073 | * | |
2074 | * If socket allocation mode allows current thread to sleep, it means its | |
2075 | * safe to use the per task page_frag instead of the per socket one. | |
2076 | */ | |
2077 | static inline struct page_frag *sk_page_frag(struct sock *sk) | |
1da177e4 | 2078 | { |
5640f768 ED |
2079 | if (sk->sk_allocation & __GFP_WAIT) |
2080 | return ¤t->task_frag; | |
1da177e4 | 2081 | |
5640f768 | 2082 | return &sk->sk_frag; |
1da177e4 LT |
2083 | } |
2084 | ||
5640f768 ED |
2085 | extern bool sk_page_frag_refill(struct sock *sk, struct page_frag *pfrag); |
2086 | ||
1da177e4 LT |
2087 | /* |
2088 | * Default write policy as shown to user space via poll/select/SIGIO | |
2089 | */ | |
dc6b9b78 | 2090 | static inline bool sock_writeable(const struct sock *sk) |
1da177e4 | 2091 | { |
8df09ea3 | 2092 | return atomic_read(&sk->sk_wmem_alloc) < (sk->sk_sndbuf >> 1); |
1da177e4 LT |
2093 | } |
2094 | ||
dd0fc66f | 2095 | static inline gfp_t gfp_any(void) |
1da177e4 | 2096 | { |
99709372 | 2097 | return in_softirq() ? GFP_ATOMIC : GFP_KERNEL; |
1da177e4 LT |
2098 | } |
2099 | ||
dc6b9b78 | 2100 | static inline long sock_rcvtimeo(const struct sock *sk, bool noblock) |
1da177e4 LT |
2101 | { |
2102 | return noblock ? 0 : sk->sk_rcvtimeo; | |
2103 | } | |
2104 | ||
dc6b9b78 | 2105 | static inline long sock_sndtimeo(const struct sock *sk, bool noblock) |
1da177e4 LT |
2106 | { |
2107 | return noblock ? 0 : sk->sk_sndtimeo; | |
2108 | } | |
2109 | ||
2110 | static inline int sock_rcvlowat(const struct sock *sk, int waitall, int len) | |
2111 | { | |
2112 | return (waitall ? len : min_t(int, sk->sk_rcvlowat, len)) ? : 1; | |
2113 | } | |
2114 | ||
2115 | /* Alas, with timeout socket operations are not restartable. | |
2116 | * Compare this to poll(). | |
2117 | */ | |
2118 | static inline int sock_intr_errno(long timeo) | |
2119 | { | |
2120 | return timeo == MAX_SCHEDULE_TIMEOUT ? -ERESTARTSYS : -EINTR; | |
2121 | } | |
2122 | ||
92f37fd2 ED |
2123 | extern void __sock_recv_timestamp(struct msghdr *msg, struct sock *sk, |
2124 | struct sk_buff *skb); | |
6e3e939f JB |
2125 | extern void __sock_recv_wifi_status(struct msghdr *msg, struct sock *sk, |
2126 | struct sk_buff *skb); | |
92f37fd2 | 2127 | |
dc6b9b78 | 2128 | static inline void |
1da177e4 LT |
2129 | sock_recv_timestamp(struct msghdr *msg, struct sock *sk, struct sk_buff *skb) |
2130 | { | |
b7aa0bf7 | 2131 | ktime_t kt = skb->tstamp; |
20d49473 | 2132 | struct skb_shared_hwtstamps *hwtstamps = skb_hwtstamps(skb); |
a61bbcf2 | 2133 | |
20d49473 PO |
2134 | /* |
2135 | * generate control messages if | |
2136 | * - receive time stamping in software requested (SOCK_RCVTSTAMP | |
2137 | * or SOCK_TIMESTAMPING_RX_SOFTWARE) | |
2138 | * - software time stamp available and wanted | |
2139 | * (SOCK_TIMESTAMPING_SOFTWARE) | |
2140 | * - hardware time stamps available and wanted | |
2141 | * (SOCK_TIMESTAMPING_SYS_HARDWARE or | |
2142 | * SOCK_TIMESTAMPING_RAW_HARDWARE) | |
2143 | */ | |
2144 | if (sock_flag(sk, SOCK_RCVTSTAMP) || | |
2145 | sock_flag(sk, SOCK_TIMESTAMPING_RX_SOFTWARE) || | |
2146 | (kt.tv64 && sock_flag(sk, SOCK_TIMESTAMPING_SOFTWARE)) || | |
2147 | (hwtstamps->hwtstamp.tv64 && | |
2148 | sock_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE)) || | |
2149 | (hwtstamps->syststamp.tv64 && | |
2150 | sock_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE))) | |
92f37fd2 ED |
2151 | __sock_recv_timestamp(msg, sk, skb); |
2152 | else | |
b7aa0bf7 | 2153 | sk->sk_stamp = kt; |
6e3e939f JB |
2154 | |
2155 | if (sock_flag(sk, SOCK_WIFI_STATUS) && skb->wifi_acked_valid) | |
2156 | __sock_recv_wifi_status(msg, sk, skb); | |
1da177e4 LT |
2157 | } |
2158 | ||
767dd033 ED |
2159 | extern void __sock_recv_ts_and_drops(struct msghdr *msg, struct sock *sk, |
2160 | struct sk_buff *skb); | |
2161 | ||
2162 | static inline void sock_recv_ts_and_drops(struct msghdr *msg, struct sock *sk, | |
2163 | struct sk_buff *skb) | |
2164 | { | |
2165 | #define FLAGS_TS_OR_DROPS ((1UL << SOCK_RXQ_OVFL) | \ | |
2166 | (1UL << SOCK_RCVTSTAMP) | \ | |
2167 | (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE) | \ | |
2168 | (1UL << SOCK_TIMESTAMPING_SOFTWARE) | \ | |
dc6b9b78 | 2169 | (1UL << SOCK_TIMESTAMPING_RAW_HARDWARE) | \ |
767dd033 ED |
2170 | (1UL << SOCK_TIMESTAMPING_SYS_HARDWARE)) |
2171 | ||
2172 | if (sk->sk_flags & FLAGS_TS_OR_DROPS) | |
2173 | __sock_recv_ts_and_drops(msg, sk, skb); | |
2174 | else | |
2175 | sk->sk_stamp = skb->tstamp; | |
2176 | } | |
3b885787 | 2177 | |
20d49473 PO |
2178 | /** |
2179 | * sock_tx_timestamp - checks whether the outgoing packet is to be time stamped | |
20d49473 | 2180 | * @sk: socket sending this packet |
2244d07b | 2181 | * @tx_flags: filled with instructions for time stamping |
20d49473 | 2182 | * |
bf84a010 | 2183 | * Currently only depends on SOCK_TIMESTAMPING* flags. |
20d49473 | 2184 | */ |
bf84a010 | 2185 | extern void sock_tx_timestamp(struct sock *sk, __u8 *tx_flags); |
20d49473 | 2186 | |
1da177e4 LT |
2187 | /** |
2188 | * sk_eat_skb - Release a skb if it is no longer needed | |
4dc3b16b PP |
2189 | * @sk: socket to eat this skb from |
2190 | * @skb: socket buffer to eat | |
f4b8ea78 | 2191 | * @copied_early: flag indicating whether DMA operations copied this data early |
1da177e4 LT |
2192 | * |
2193 | * This routine must be called with interrupts disabled or with the socket | |
2194 | * locked so that the sk_buff queue operation is ok. | |
2195 | */ | |
624d1164 | 2196 | #ifdef CONFIG_NET_DMA |
dc6b9b78 | 2197 | static inline void sk_eat_skb(struct sock *sk, struct sk_buff *skb, bool copied_early) |
624d1164 CL |
2198 | { |
2199 | __skb_unlink(skb, &sk->sk_receive_queue); | |
2200 | if (!copied_early) | |
2201 | __kfree_skb(skb); | |
2202 | else | |
2203 | __skb_queue_tail(&sk->sk_async_wait_queue, skb); | |
2204 | } | |
2205 | #else | |
dc6b9b78 | 2206 | static inline void sk_eat_skb(struct sock *sk, struct sk_buff *skb, bool copied_early) |
1da177e4 LT |
2207 | { |
2208 | __skb_unlink(skb, &sk->sk_receive_queue); | |
2209 | __kfree_skb(skb); | |
2210 | } | |
624d1164 | 2211 | #endif |
1da177e4 | 2212 | |
3b1e0a65 YH |
2213 | static inline |
2214 | struct net *sock_net(const struct sock *sk) | |
2215 | { | |
c2d9ba9b | 2216 | return read_pnet(&sk->sk_net); |
3b1e0a65 YH |
2217 | } |
2218 | ||
2219 | static inline | |
f5aa23fd | 2220 | void sock_net_set(struct sock *sk, struct net *net) |
3b1e0a65 | 2221 | { |
c2d9ba9b | 2222 | write_pnet(&sk->sk_net, net); |
3b1e0a65 YH |
2223 | } |
2224 | ||
edf02087 DL |
2225 | /* |
2226 | * Kernel sockets, f.e. rtnl or icmp_socket, are a part of a namespace. | |
25985edc | 2227 | * They should not hold a reference to a namespace in order to allow |
edf02087 DL |
2228 | * to stop it. |
2229 | * Sockets after sk_change_net should be released using sk_release_kernel | |
2230 | */ | |
2231 | static inline void sk_change_net(struct sock *sk, struct net *net) | |
2232 | { | |
3b1e0a65 | 2233 | put_net(sock_net(sk)); |
65a18ec5 | 2234 | sock_net_set(sk, hold_net(net)); |
edf02087 DL |
2235 | } |
2236 | ||
23542618 KK |
2237 | static inline struct sock *skb_steal_sock(struct sk_buff *skb) |
2238 | { | |
efc27f8c | 2239 | if (skb->sk) { |
23542618 KK |
2240 | struct sock *sk = skb->sk; |
2241 | ||
2242 | skb->destructor = NULL; | |
2243 | skb->sk = NULL; | |
2244 | return sk; | |
2245 | } | |
2246 | return NULL; | |
2247 | } | |
2248 | ||
20d49473 | 2249 | extern void sock_enable_timestamp(struct sock *sk, int flag); |
1da177e4 | 2250 | extern int sock_get_timestamp(struct sock *, struct timeval __user *); |
ae40eb1e | 2251 | extern int sock_get_timestampns(struct sock *, struct timespec __user *); |
cb820f8e RC |
2252 | extern int sock_recv_errqueue(struct sock *sk, struct msghdr *msg, int len, |
2253 | int level, int type); | |
1da177e4 | 2254 | |
dc6b9b78 ED |
2255 | /* |
2256 | * Enable debug/info messages | |
1da177e4 | 2257 | */ |
a2a316fd SH |
2258 | extern int net_msg_warn; |
2259 | #define NETDEBUG(fmt, args...) \ | |
2260 | do { if (net_msg_warn) printk(fmt,##args); } while (0) | |
1da177e4 | 2261 | |
a2a316fd SH |
2262 | #define LIMIT_NETDEBUG(fmt, args...) \ |
2263 | do { if (net_msg_warn && net_ratelimit()) printk(fmt,##args); } while(0) | |
1da177e4 | 2264 | |
1da177e4 LT |
2265 | extern __u32 sysctl_wmem_max; |
2266 | extern __u32 sysctl_rmem_max; | |
2267 | ||
6baf1f41 DM |
2268 | extern int sysctl_optmem_max; |
2269 | ||
20380731 ACM |
2270 | extern __u32 sysctl_wmem_default; |
2271 | extern __u32 sysctl_rmem_default; | |
20380731 | 2272 | |
1da177e4 | 2273 | #endif /* _SOCK_H */ |