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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> |
3e32cb2e | 57 | #include <linux/page_counter.h> |
180d8cd9 | 58 | #include <linux/memcontrol.h> |
c5905afb | 59 | #include <linux/static_key.h> |
40401530 | 60 | #include <linux/sched.h> |
1ce0bf50 | 61 | #include <linux/wait.h> |
2a56a1fe | 62 | #include <linux/cgroup-defs.h> |
1da177e4 LT |
63 | |
64 | #include <linux/filter.h> | |
88ab1932 | 65 | #include <linux/rculist_nulls.h> |
a57de0b4 | 66 | #include <linux/poll.h> |
1da177e4 | 67 | |
c31504dc | 68 | #include <linux/atomic.h> |
1da177e4 LT |
69 | #include <net/dst.h> |
70 | #include <net/checksum.h> | |
1d0ab253 | 71 | #include <net/tcp_states.h> |
b9f40e21 | 72 | #include <linux/net_tstamp.h> |
1da177e4 LT |
73 | |
74 | /* | |
75 | * This structure really needs to be cleaned up. | |
76 | * Most of it is for TCP, and not used by any of | |
77 | * the other protocols. | |
78 | */ | |
79 | ||
80 | /* Define this to get the SOCK_DBG debugging facility. */ | |
81 | #define SOCK_DEBUGGING | |
82 | #ifdef SOCK_DEBUGGING | |
83 | #define SOCK_DEBUG(sk, msg...) do { if ((sk) && sock_flag((sk), SOCK_DBG)) \ | |
84 | printk(KERN_DEBUG msg); } while (0) | |
85 | #else | |
4cd9029d | 86 | /* Validate arguments and do nothing */ |
b9075fa9 | 87 | static inline __printf(2, 3) |
dc6b9b78 | 88 | void SOCK_DEBUG(const struct sock *sk, const char *msg, ...) |
4cd9029d SH |
89 | { |
90 | } | |
1da177e4 LT |
91 | #endif |
92 | ||
93 | /* This is the per-socket lock. The spinlock provides a synchronization | |
94 | * between user contexts and software interrupt processing, whereas the | |
95 | * mini-semaphore synchronizes multiple users amongst themselves. | |
96 | */ | |
1da177e4 LT |
97 | typedef struct { |
98 | spinlock_t slock; | |
d2e9117c | 99 | int owned; |
1da177e4 | 100 | wait_queue_head_t wq; |
a5b5bb9a IM |
101 | /* |
102 | * We express the mutex-alike socket_lock semantics | |
103 | * to the lock validator by explicitly managing | |
104 | * the slock as a lock variant (in addition to | |
105 | * the slock itself): | |
106 | */ | |
107 | #ifdef CONFIG_DEBUG_LOCK_ALLOC | |
108 | struct lockdep_map dep_map; | |
109 | #endif | |
1da177e4 LT |
110 | } socket_lock_t; |
111 | ||
1da177e4 | 112 | struct sock; |
8feaf0c0 | 113 | struct proto; |
0eeb8ffc | 114 | struct net; |
1da177e4 | 115 | |
077b393d ED |
116 | typedef __u32 __bitwise __portpair; |
117 | typedef __u64 __bitwise __addrpair; | |
118 | ||
1da177e4 | 119 | /** |
4dc3b16b | 120 | * struct sock_common - minimal network layer representation of sockets |
68835aba ED |
121 | * @skc_daddr: Foreign IPv4 addr |
122 | * @skc_rcv_saddr: Bound local IPv4 addr | |
4dc6dc71 | 123 | * @skc_hash: hash value used with various protocol lookup tables |
d4cada4a | 124 | * @skc_u16hashes: two u16 hash values used by UDP lookup tables |
ce43b03e ED |
125 | * @skc_dport: placeholder for inet_dport/tw_dport |
126 | * @skc_num: placeholder for inet_num/tw_num | |
4dc3b16b PP |
127 | * @skc_family: network address family |
128 | * @skc_state: Connection state | |
129 | * @skc_reuse: %SO_REUSEADDR setting | |
055dc21a | 130 | * @skc_reuseport: %SO_REUSEPORT setting |
4dc3b16b | 131 | * @skc_bound_dev_if: bound device index if != 0 |
4dc3b16b | 132 | * @skc_bind_node: bind hash linkage for various protocol lookup tables |
512615b6 | 133 | * @skc_portaddr_node: second hash linkage for UDP/UDP-Lite protocol |
8feaf0c0 | 134 | * @skc_prot: protocol handlers inside a network family |
07feaebf | 135 | * @skc_net: reference to the network namespace of this socket |
68835aba ED |
136 | * @skc_node: main hash linkage for various protocol lookup tables |
137 | * @skc_nulls_node: main hash linkage for TCP/UDP/UDP-Lite protocol | |
138 | * @skc_tx_queue_mapping: tx queue number for this connection | |
8e5eb54d ED |
139 | * @skc_flags: place holder for sk_flags |
140 | * %SO_LINGER (l_onoff), %SO_BROADCAST, %SO_KEEPALIVE, | |
141 | * %SO_OOBINLINE settings, %SO_TIMESTAMPING settings | |
70da268b | 142 | * @skc_incoming_cpu: record/match cpu processing incoming packets |
68835aba | 143 | * @skc_refcnt: reference count |
4dc3b16b PP |
144 | * |
145 | * This is the minimal network layer representation of sockets, the header | |
8feaf0c0 ACM |
146 | * for struct sock and struct inet_timewait_sock. |
147 | */ | |
1da177e4 | 148 | struct sock_common { |
ce43b03e | 149 | /* skc_daddr and skc_rcv_saddr must be grouped on a 8 bytes aligned |
05dbc7b5 | 150 | * address on 64bit arches : cf INET_MATCH() |
4dc6dc71 | 151 | */ |
ce43b03e | 152 | union { |
077b393d | 153 | __addrpair skc_addrpair; |
ce43b03e ED |
154 | struct { |
155 | __be32 skc_daddr; | |
156 | __be32 skc_rcv_saddr; | |
157 | }; | |
158 | }; | |
d4cada4a ED |
159 | union { |
160 | unsigned int skc_hash; | |
161 | __u16 skc_u16hashes[2]; | |
162 | }; | |
ce43b03e ED |
163 | /* skc_dport && skc_num must be grouped as well */ |
164 | union { | |
077b393d | 165 | __portpair skc_portpair; |
ce43b03e ED |
166 | struct { |
167 | __be16 skc_dport; | |
168 | __u16 skc_num; | |
169 | }; | |
170 | }; | |
171 | ||
4dc6dc71 ED |
172 | unsigned short skc_family; |
173 | volatile unsigned char skc_state; | |
055dc21a | 174 | unsigned char skc_reuse:4; |
9fe516ba ED |
175 | unsigned char skc_reuseport:1; |
176 | unsigned char skc_ipv6only:1; | |
26abe143 | 177 | unsigned char skc_net_refcnt:1; |
4dc6dc71 | 178 | int skc_bound_dev_if; |
512615b6 ED |
179 | union { |
180 | struct hlist_node skc_bind_node; | |
ca065d0c | 181 | struct hlist_node skc_portaddr_node; |
512615b6 | 182 | }; |
8feaf0c0 | 183 | struct proto *skc_prot; |
0c5c9fb5 | 184 | possible_net_t skc_net; |
efe4208f ED |
185 | |
186 | #if IS_ENABLED(CONFIG_IPV6) | |
187 | struct in6_addr skc_v6_daddr; | |
188 | struct in6_addr skc_v6_rcv_saddr; | |
189 | #endif | |
190 | ||
33cf7c90 ED |
191 | atomic64_t skc_cookie; |
192 | ||
8e5eb54d ED |
193 | /* following fields are padding to force |
194 | * offset(struct sock, sk_refcnt) == 128 on 64bit arches | |
195 | * assuming IPV6 is enabled. We use this padding differently | |
196 | * for different kind of 'sockets' | |
197 | */ | |
198 | union { | |
199 | unsigned long skc_flags; | |
200 | struct sock *skc_listener; /* request_sock */ | |
201 | struct inet_timewait_death_row *skc_tw_dr; /* inet_timewait_sock */ | |
202 | }; | |
68835aba ED |
203 | /* |
204 | * fields between dontcopy_begin/dontcopy_end | |
205 | * are not copied in sock_copy() | |
206 | */ | |
928c41e7 | 207 | /* private: */ |
68835aba | 208 | int skc_dontcopy_begin[0]; |
928c41e7 | 209 | /* public: */ |
68835aba ED |
210 | union { |
211 | struct hlist_node skc_node; | |
212 | struct hlist_nulls_node skc_nulls_node; | |
213 | }; | |
214 | int skc_tx_queue_mapping; | |
ed53d0ab ED |
215 | union { |
216 | int skc_incoming_cpu; | |
217 | u32 skc_rcv_wnd; | |
d475f090 | 218 | u32 skc_tw_rcv_nxt; /* struct tcp_timewait_sock */ |
ed53d0ab | 219 | }; |
70da268b | 220 | |
68835aba | 221 | atomic_t skc_refcnt; |
928c41e7 | 222 | /* private: */ |
68835aba | 223 | int skc_dontcopy_end[0]; |
ed53d0ab ED |
224 | union { |
225 | u32 skc_rxhash; | |
226 | u32 skc_window_clamp; | |
d475f090 | 227 | u32 skc_tw_snd_nxt; /* struct tcp_timewait_sock */ |
ed53d0ab | 228 | }; |
928c41e7 | 229 | /* public: */ |
1da177e4 LT |
230 | }; |
231 | ||
232 | /** | |
233 | * struct sock - network layer representation of sockets | |
8feaf0c0 | 234 | * @__sk_common: shared layout with inet_timewait_sock |
4dc3b16b PP |
235 | * @sk_shutdown: mask of %SEND_SHUTDOWN and/or %RCV_SHUTDOWN |
236 | * @sk_userlocks: %SO_SNDBUF and %SO_RCVBUF settings | |
237 | * @sk_lock: synchronizer | |
238 | * @sk_rcvbuf: size of receive buffer in bytes | |
43815482 | 239 | * @sk_wq: sock wait queue and async head |
421b3885 | 240 | * @sk_rx_dst: receive input route used by early demux |
4dc3b16b | 241 | * @sk_dst_cache: destination cache |
4dc3b16b | 242 | * @sk_policy: flow policy |
4dc3b16b PP |
243 | * @sk_receive_queue: incoming packets |
244 | * @sk_wmem_alloc: transmit queue bytes committed | |
245 | * @sk_write_queue: Packet sending queue | |
246 | * @sk_omem_alloc: "o" is "option" or "other" | |
247 | * @sk_wmem_queued: persistent queue size | |
248 | * @sk_forward_alloc: space allocated forward | |
06021292 | 249 | * @sk_napi_id: id of the last napi context to receive data for sk |
dafcc438 | 250 | * @sk_ll_usec: usecs to busypoll when there is no data |
4dc3b16b | 251 | * @sk_allocation: allocation mode |
95bd09eb | 252 | * @sk_pacing_rate: Pacing rate (if supported by transport/packet scheduler) |
c3f40d7c | 253 | * @sk_max_pacing_rate: Maximum pacing rate (%SO_MAX_PACING_RATE) |
4dc3b16b | 254 | * @sk_sndbuf: size of send buffer in bytes |
293de7de | 255 | * @sk_padding: unused element for alignment |
28448b80 TH |
256 | * @sk_no_check_tx: %SO_NO_CHECK setting, set checksum in TX packets |
257 | * @sk_no_check_rx: allow zero checksum in RX packets | |
4dc3b16b | 258 | * @sk_route_caps: route capabilities (e.g. %NETIF_F_TSO) |
a465419b | 259 | * @sk_route_nocaps: forbidden route capabilities (e.g NETIF_F_GSO_MASK) |
bcd76111 | 260 | * @sk_gso_type: GSO type (e.g. %SKB_GSO_TCPV4) |
82cc1a7a | 261 | * @sk_gso_max_size: Maximum GSO segment size to build |
1485348d | 262 | * @sk_gso_max_segs: Maximum number of GSO segments |
4dc3b16b | 263 | * @sk_lingertime: %SO_LINGER l_linger setting |
4dc3b16b PP |
264 | * @sk_backlog: always used with the per-socket spinlock held |
265 | * @sk_callback_lock: used with the callbacks in the end of this struct | |
266 | * @sk_error_queue: rarely used | |
33c732c3 WC |
267 | * @sk_prot_creator: sk_prot of original sock creator (see ipv6_setsockopt, |
268 | * IPV6_ADDRFORM for instance) | |
4dc3b16b | 269 | * @sk_err: last error |
33c732c3 WC |
270 | * @sk_err_soft: errors that don't cause failure but are the cause of a |
271 | * persistent failure not just 'timed out' | |
cb61cb9b | 272 | * @sk_drops: raw/udp drops counter |
4dc3b16b PP |
273 | * @sk_ack_backlog: current listen backlog |
274 | * @sk_max_ack_backlog: listen backlog set in listen() | |
275 | * @sk_priority: %SO_PRIORITY setting | |
276 | * @sk_type: socket type (%SOCK_STREAM, etc) | |
277 | * @sk_protocol: which protocol this socket belongs in this network family | |
53c3fa20 RD |
278 | * @sk_peer_pid: &struct pid for this socket's peer |
279 | * @sk_peer_cred: %SO_PEERCRED setting | |
4dc3b16b PP |
280 | * @sk_rcvlowat: %SO_RCVLOWAT setting |
281 | * @sk_rcvtimeo: %SO_RCVTIMEO setting | |
282 | * @sk_sndtimeo: %SO_SNDTIMEO setting | |
b73c3d0e | 283 | * @sk_txhash: computed flow hash for use on transmit |
4dc3b16b | 284 | * @sk_filter: socket filtering instructions |
4dc3b16b PP |
285 | * @sk_timer: sock cleanup timer |
286 | * @sk_stamp: time stamp of last packet received | |
b9f40e21 | 287 | * @sk_tsflags: SO_TIMESTAMPING socket options |
09c2d251 | 288 | * @sk_tskey: counter to disambiguate concurrent tstamp requests |
4dc3b16b PP |
289 | * @sk_socket: Identd and reporting IO signals |
290 | * @sk_user_data: RPC layer private data | |
5640f768 | 291 | * @sk_frag: cached page frag |
d3d4f0a0 | 292 | * @sk_peek_off: current peek_offset value |
4dc3b16b | 293 | * @sk_send_head: front of stuff to transmit |
67be2dd1 | 294 | * @sk_security: used by security modules |
31729363 | 295 | * @sk_mark: generic packet mark |
2a56a1fe | 296 | * @sk_cgrp_data: cgroup data for this cgroup |
baac50bb | 297 | * @sk_memcg: this socket's memory cgroup association |
4dc3b16b PP |
298 | * @sk_write_pending: a write to stream socket waits to start |
299 | * @sk_state_change: callback to indicate change in the state of the sock | |
300 | * @sk_data_ready: callback to indicate there is data to be processed | |
301 | * @sk_write_space: callback to indicate there is bf sending space available | |
302 | * @sk_error_report: callback to indicate errors (e.g. %MSG_ERRQUEUE) | |
303 | * @sk_backlog_rcv: callback to process the backlog | |
304 | * @sk_destruct: called at sock freeing time, i.e. when all refcnt == 0 | |
ef456144 | 305 | * @sk_reuseport_cb: reuseport group container |
293de7de SH |
306 | * @sk_rcu: used during RCU grace period |
307 | */ | |
1da177e4 LT |
308 | struct sock { |
309 | /* | |
8feaf0c0 | 310 | * Now struct inet_timewait_sock also uses sock_common, so please just |
1da177e4 LT |
311 | * don't add nothing before this first member (__sk_common) --acme |
312 | */ | |
313 | struct sock_common __sk_common; | |
4dc6dc71 ED |
314 | #define sk_node __sk_common.skc_node |
315 | #define sk_nulls_node __sk_common.skc_nulls_node | |
316 | #define sk_refcnt __sk_common.skc_refcnt | |
e022f0b4 | 317 | #define sk_tx_queue_mapping __sk_common.skc_tx_queue_mapping |
4dc6dc71 | 318 | |
68835aba ED |
319 | #define sk_dontcopy_begin __sk_common.skc_dontcopy_begin |
320 | #define sk_dontcopy_end __sk_common.skc_dontcopy_end | |
4dc6dc71 | 321 | #define sk_hash __sk_common.skc_hash |
50805466 | 322 | #define sk_portpair __sk_common.skc_portpair |
05dbc7b5 ED |
323 | #define sk_num __sk_common.skc_num |
324 | #define sk_dport __sk_common.skc_dport | |
50805466 ED |
325 | #define sk_addrpair __sk_common.skc_addrpair |
326 | #define sk_daddr __sk_common.skc_daddr | |
327 | #define sk_rcv_saddr __sk_common.skc_rcv_saddr | |
1da177e4 LT |
328 | #define sk_family __sk_common.skc_family |
329 | #define sk_state __sk_common.skc_state | |
330 | #define sk_reuse __sk_common.skc_reuse | |
055dc21a | 331 | #define sk_reuseport __sk_common.skc_reuseport |
9fe516ba | 332 | #define sk_ipv6only __sk_common.skc_ipv6only |
26abe143 | 333 | #define sk_net_refcnt __sk_common.skc_net_refcnt |
1da177e4 | 334 | #define sk_bound_dev_if __sk_common.skc_bound_dev_if |
1da177e4 | 335 | #define sk_bind_node __sk_common.skc_bind_node |
8feaf0c0 | 336 | #define sk_prot __sk_common.skc_prot |
07feaebf | 337 | #define sk_net __sk_common.skc_net |
efe4208f ED |
338 | #define sk_v6_daddr __sk_common.skc_v6_daddr |
339 | #define sk_v6_rcv_saddr __sk_common.skc_v6_rcv_saddr | |
33cf7c90 | 340 | #define sk_cookie __sk_common.skc_cookie |
70da268b | 341 | #define sk_incoming_cpu __sk_common.skc_incoming_cpu |
8e5eb54d | 342 | #define sk_flags __sk_common.skc_flags |
ed53d0ab | 343 | #define sk_rxhash __sk_common.skc_rxhash |
efe4208f | 344 | |
1da177e4 | 345 | socket_lock_t sk_lock; |
b178bb3d | 346 | struct sk_buff_head sk_receive_queue; |
fa438ccf ED |
347 | /* |
348 | * The backlog queue is special, it is always used with | |
349 | * the per-socket spinlock held and requires low latency | |
350 | * access. Therefore we special case it's implementation. | |
b178bb3d ED |
351 | * Note : rmem_alloc is in this structure to fill a hole |
352 | * on 64bit arches, not because its logically part of | |
353 | * backlog. | |
fa438ccf ED |
354 | */ |
355 | struct { | |
b178bb3d ED |
356 | atomic_t rmem_alloc; |
357 | int len; | |
358 | struct sk_buff *head; | |
359 | struct sk_buff *tail; | |
fa438ccf | 360 | } sk_backlog; |
b178bb3d ED |
361 | #define sk_rmem_alloc sk_backlog.rmem_alloc |
362 | int sk_forward_alloc; | |
2c8c56e1 | 363 | |
b73c3d0e | 364 | __u32 sk_txhash; |
e0d1095a | 365 | #ifdef CONFIG_NET_RX_BUSY_POLL |
06021292 | 366 | unsigned int sk_napi_id; |
dafcc438 | 367 | unsigned int sk_ll_usec; |
b178bb3d ED |
368 | #endif |
369 | atomic_t sk_drops; | |
370 | int sk_rcvbuf; | |
371 | ||
372 | struct sk_filter __rcu *sk_filter; | |
ceb5d58b ED |
373 | union { |
374 | struct socket_wq __rcu *sk_wq; | |
375 | struct socket_wq *sk_wq_raw; | |
376 | }; | |
def8b4fa | 377 | #ifdef CONFIG_XFRM |
d188ba86 | 378 | struct xfrm_policy __rcu *sk_policy[2]; |
def8b4fa | 379 | #endif |
deaa5854 | 380 | struct dst_entry *sk_rx_dst; |
0e36cbb3 | 381 | struct dst_entry __rcu *sk_dst_cache; |
6bd4f355 | 382 | /* Note: 32bit hole on 64bit arches */ |
1da177e4 LT |
383 | atomic_t sk_wmem_alloc; |
384 | atomic_t sk_omem_alloc; | |
4e07a91c | 385 | int sk_sndbuf; |
1da177e4 | 386 | struct sk_buff_head sk_write_queue; |
fc64869c AR |
387 | |
388 | /* | |
389 | * Because of non atomicity rules, all | |
390 | * changes are protected by socket lock. | |
391 | */ | |
aa4c1037 DA |
392 | unsigned int __sk_flags_offset[0]; |
393 | #ifdef __BIG_ENDIAN_BITFIELD | |
394 | #define SK_FL_PROTO_SHIFT 16 | |
395 | #define SK_FL_PROTO_MASK 0x00ff0000 | |
396 | ||
397 | #define SK_FL_TYPE_SHIFT 0 | |
398 | #define SK_FL_TYPE_MASK 0x0000ffff | |
399 | #else | |
400 | #define SK_FL_PROTO_SHIFT 8 | |
401 | #define SK_FL_PROTO_MASK 0x0000ff00 | |
402 | ||
403 | #define SK_FL_TYPE_SHIFT 16 | |
404 | #define SK_FL_TYPE_MASK 0xffff0000 | |
405 | #endif | |
406 | ||
b178bb3d | 407 | kmemcheck_bitfield_begin(flags); |
fc64869c | 408 | unsigned int sk_padding : 2, |
28448b80 TH |
409 | sk_no_check_tx : 1, |
410 | sk_no_check_rx : 1, | |
b178bb3d ED |
411 | sk_userlocks : 4, |
412 | sk_protocol : 8, | |
413 | sk_type : 16; | |
7bbadd2d | 414 | #define SK_PROTOCOL_MAX U8_MAX |
b178bb3d | 415 | kmemcheck_bitfield_end(flags); |
fc64869c | 416 | |
1da177e4 | 417 | int sk_wmem_queued; |
7d877f3b | 418 | gfp_t sk_allocation; |
95bd09eb | 419 | u32 sk_pacing_rate; /* bytes per second */ |
62748f32 | 420 | u32 sk_max_pacing_rate; |
c8f44aff MM |
421 | netdev_features_t sk_route_caps; |
422 | netdev_features_t sk_route_nocaps; | |
bcd76111 | 423 | int sk_gso_type; |
82cc1a7a | 424 | unsigned int sk_gso_max_size; |
1485348d | 425 | u16 sk_gso_max_segs; |
9932cf95 | 426 | int sk_rcvlowat; |
1da177e4 | 427 | unsigned long sk_lingertime; |
1da177e4 | 428 | struct sk_buff_head sk_error_queue; |
476e19cf | 429 | struct proto *sk_prot_creator; |
1da177e4 LT |
430 | rwlock_t sk_callback_lock; |
431 | int sk_err, | |
432 | sk_err_soft; | |
becb74f0 ED |
433 | u32 sk_ack_backlog; |
434 | u32 sk_max_ack_backlog; | |
1da177e4 | 435 | __u32 sk_priority; |
297dbde1 | 436 | __u32 sk_mark; |
86741ec2 | 437 | kuid_t sk_uid; |
109f6e39 EB |
438 | struct pid *sk_peer_pid; |
439 | const struct cred *sk_peer_cred; | |
1da177e4 LT |
440 | long sk_rcvtimeo; |
441 | long sk_sndtimeo; | |
1da177e4 | 442 | struct timer_list sk_timer; |
b7aa0bf7 | 443 | ktime_t sk_stamp; |
b9f40e21 | 444 | u16 sk_tsflags; |
fc64869c | 445 | u8 sk_shutdown; |
09c2d251 | 446 | u32 sk_tskey; |
1da177e4 LT |
447 | struct socket *sk_socket; |
448 | void *sk_user_data; | |
5640f768 | 449 | struct page_frag sk_frag; |
1da177e4 | 450 | struct sk_buff *sk_send_head; |
ef64a54f | 451 | __s32 sk_peek_off; |
1da177e4 | 452 | int sk_write_pending; |
d5f64238 | 453 | #ifdef CONFIG_SECURITY |
1da177e4 | 454 | void *sk_security; |
d5f64238 | 455 | #endif |
2a56a1fe | 456 | struct sock_cgroup_data sk_cgrp_data; |
baac50bb | 457 | struct mem_cgroup *sk_memcg; |
1da177e4 | 458 | void (*sk_state_change)(struct sock *sk); |
676d2369 | 459 | void (*sk_data_ready)(struct sock *sk); |
1da177e4 LT |
460 | void (*sk_write_space)(struct sock *sk); |
461 | void (*sk_error_report)(struct sock *sk); | |
dc6b9b78 ED |
462 | int (*sk_backlog_rcv)(struct sock *sk, |
463 | struct sk_buff *skb); | |
1da177e4 | 464 | void (*sk_destruct)(struct sock *sk); |
ef456144 | 465 | struct sock_reuseport __rcu *sk_reuseport_cb; |
a4298e45 | 466 | struct rcu_head sk_rcu; |
1da177e4 LT |
467 | }; |
468 | ||
559835ea PS |
469 | #define __sk_user_data(sk) ((*((void __rcu **)&(sk)->sk_user_data))) |
470 | ||
471 | #define rcu_dereference_sk_user_data(sk) rcu_dereference(__sk_user_data((sk))) | |
472 | #define rcu_assign_sk_user_data(sk, ptr) rcu_assign_pointer(__sk_user_data((sk)), ptr) | |
473 | ||
4a17fd52 PE |
474 | /* |
475 | * SK_CAN_REUSE and SK_NO_REUSE on a socket mean that the socket is OK | |
476 | * or not whether his port will be reused by someone else. SK_FORCE_REUSE | |
477 | * on a socket means that the socket will reuse everybody else's port | |
478 | * without looking at the other's sk_reuse value. | |
479 | */ | |
480 | ||
481 | #define SK_NO_REUSE 0 | |
482 | #define SK_CAN_REUSE 1 | |
483 | #define SK_FORCE_REUSE 2 | |
484 | ||
627d2d6b | 485 | int sk_set_peek_off(struct sock *sk, int val); |
486 | ||
ef64a54f PE |
487 | static inline int sk_peek_offset(struct sock *sk, int flags) |
488 | { | |
b9bb53f3 WB |
489 | if (unlikely(flags & MSG_PEEK)) { |
490 | s32 off = READ_ONCE(sk->sk_peek_off); | |
491 | if (off >= 0) | |
492 | return off; | |
493 | } | |
494 | ||
495 | return 0; | |
ef64a54f PE |
496 | } |
497 | ||
498 | static inline void sk_peek_offset_bwd(struct sock *sk, int val) | |
499 | { | |
b9bb53f3 WB |
500 | s32 off = READ_ONCE(sk->sk_peek_off); |
501 | ||
502 | if (unlikely(off >= 0)) { | |
503 | off = max_t(s32, off - val, 0); | |
504 | WRITE_ONCE(sk->sk_peek_off, off); | |
ef64a54f PE |
505 | } |
506 | } | |
507 | ||
508 | static inline void sk_peek_offset_fwd(struct sock *sk, int val) | |
509 | { | |
b9bb53f3 | 510 | sk_peek_offset_bwd(sk, -val); |
ef64a54f PE |
511 | } |
512 | ||
1da177e4 LT |
513 | /* |
514 | * Hashed lists helper routines | |
515 | */ | |
c4146644 LZ |
516 | static inline struct sock *sk_entry(const struct hlist_node *node) |
517 | { | |
518 | return hlist_entry(node, struct sock, sk_node); | |
519 | } | |
520 | ||
e48c414e | 521 | static inline struct sock *__sk_head(const struct hlist_head *head) |
1da177e4 LT |
522 | { |
523 | return hlist_entry(head->first, struct sock, sk_node); | |
524 | } | |
525 | ||
e48c414e | 526 | static inline struct sock *sk_head(const struct hlist_head *head) |
1da177e4 LT |
527 | { |
528 | return hlist_empty(head) ? NULL : __sk_head(head); | |
529 | } | |
530 | ||
88ab1932 ED |
531 | static inline struct sock *__sk_nulls_head(const struct hlist_nulls_head *head) |
532 | { | |
533 | return hlist_nulls_entry(head->first, struct sock, sk_nulls_node); | |
534 | } | |
535 | ||
536 | static inline struct sock *sk_nulls_head(const struct hlist_nulls_head *head) | |
537 | { | |
538 | return hlist_nulls_empty(head) ? NULL : __sk_nulls_head(head); | |
539 | } | |
540 | ||
e48c414e | 541 | static inline struct sock *sk_next(const struct sock *sk) |
1da177e4 LT |
542 | { |
543 | return sk->sk_node.next ? | |
544 | hlist_entry(sk->sk_node.next, struct sock, sk_node) : NULL; | |
545 | } | |
546 | ||
88ab1932 ED |
547 | static inline struct sock *sk_nulls_next(const struct sock *sk) |
548 | { | |
549 | return (!is_a_nulls(sk->sk_nulls_node.next)) ? | |
550 | hlist_nulls_entry(sk->sk_nulls_node.next, | |
551 | struct sock, sk_nulls_node) : | |
552 | NULL; | |
553 | } | |
554 | ||
dc6b9b78 | 555 | static inline bool sk_unhashed(const struct sock *sk) |
1da177e4 LT |
556 | { |
557 | return hlist_unhashed(&sk->sk_node); | |
558 | } | |
559 | ||
dc6b9b78 | 560 | static inline bool sk_hashed(const struct sock *sk) |
1da177e4 | 561 | { |
da753bea | 562 | return !sk_unhashed(sk); |
1da177e4 LT |
563 | } |
564 | ||
dc6b9b78 | 565 | static inline void sk_node_init(struct hlist_node *node) |
1da177e4 LT |
566 | { |
567 | node->pprev = NULL; | |
568 | } | |
569 | ||
dc6b9b78 | 570 | static inline void sk_nulls_node_init(struct hlist_nulls_node *node) |
88ab1932 ED |
571 | { |
572 | node->pprev = NULL; | |
573 | } | |
574 | ||
dc6b9b78 | 575 | static inline void __sk_del_node(struct sock *sk) |
1da177e4 LT |
576 | { |
577 | __hlist_del(&sk->sk_node); | |
578 | } | |
579 | ||
808f5114 | 580 | /* NB: equivalent to hlist_del_init_rcu */ |
dc6b9b78 | 581 | static inline bool __sk_del_node_init(struct sock *sk) |
1da177e4 LT |
582 | { |
583 | if (sk_hashed(sk)) { | |
584 | __sk_del_node(sk); | |
585 | sk_node_init(&sk->sk_node); | |
dc6b9b78 | 586 | return true; |
1da177e4 | 587 | } |
dc6b9b78 | 588 | return false; |
1da177e4 LT |
589 | } |
590 | ||
591 | /* Grab socket reference count. This operation is valid only | |
592 | when sk is ALREADY grabbed f.e. it is found in hash table | |
593 | or a list and the lookup is made under lock preventing hash table | |
594 | modifications. | |
595 | */ | |
596 | ||
f9a7cbbf | 597 | static __always_inline void sock_hold(struct sock *sk) |
1da177e4 LT |
598 | { |
599 | atomic_inc(&sk->sk_refcnt); | |
600 | } | |
601 | ||
602 | /* Ungrab socket in the context, which assumes that socket refcnt | |
603 | cannot hit zero, f.e. it is true in context of any socketcall. | |
604 | */ | |
f9a7cbbf | 605 | static __always_inline void __sock_put(struct sock *sk) |
1da177e4 LT |
606 | { |
607 | atomic_dec(&sk->sk_refcnt); | |
608 | } | |
609 | ||
dc6b9b78 | 610 | static inline bool sk_del_node_init(struct sock *sk) |
1da177e4 | 611 | { |
dc6b9b78 | 612 | bool rc = __sk_del_node_init(sk); |
1da177e4 LT |
613 | |
614 | if (rc) { | |
615 | /* paranoid for a while -acme */ | |
616 | WARN_ON(atomic_read(&sk->sk_refcnt) == 1); | |
617 | __sock_put(sk); | |
618 | } | |
619 | return rc; | |
620 | } | |
808f5114 | 621 | #define sk_del_node_init_rcu(sk) sk_del_node_init(sk) |
1da177e4 | 622 | |
dc6b9b78 | 623 | static inline bool __sk_nulls_del_node_init_rcu(struct sock *sk) |
271b72c7 ED |
624 | { |
625 | if (sk_hashed(sk)) { | |
88ab1932 | 626 | hlist_nulls_del_init_rcu(&sk->sk_nulls_node); |
dc6b9b78 | 627 | return true; |
271b72c7 | 628 | } |
dc6b9b78 | 629 | return false; |
271b72c7 ED |
630 | } |
631 | ||
dc6b9b78 | 632 | static inline bool sk_nulls_del_node_init_rcu(struct sock *sk) |
271b72c7 | 633 | { |
dc6b9b78 | 634 | bool rc = __sk_nulls_del_node_init_rcu(sk); |
271b72c7 ED |
635 | |
636 | if (rc) { | |
637 | /* paranoid for a while -acme */ | |
638 | WARN_ON(atomic_read(&sk->sk_refcnt) == 1); | |
639 | __sock_put(sk); | |
640 | } | |
641 | return rc; | |
642 | } | |
643 | ||
dc6b9b78 | 644 | static inline void __sk_add_node(struct sock *sk, struct hlist_head *list) |
1da177e4 LT |
645 | { |
646 | hlist_add_head(&sk->sk_node, list); | |
647 | } | |
648 | ||
dc6b9b78 | 649 | static inline void sk_add_node(struct sock *sk, struct hlist_head *list) |
1da177e4 LT |
650 | { |
651 | sock_hold(sk); | |
652 | __sk_add_node(sk, list); | |
653 | } | |
654 | ||
dc6b9b78 | 655 | static inline void sk_add_node_rcu(struct sock *sk, struct hlist_head *list) |
808f5114 | 656 | { |
657 | sock_hold(sk); | |
d296ba60 CG |
658 | if (IS_ENABLED(CONFIG_IPV6) && sk->sk_reuseport && |
659 | sk->sk_family == AF_INET6) | |
660 | hlist_add_tail_rcu(&sk->sk_node, list); | |
661 | else | |
662 | hlist_add_head_rcu(&sk->sk_node, list); | |
808f5114 | 663 | } |
664 | ||
dc6b9b78 | 665 | static inline void __sk_nulls_add_node_rcu(struct sock *sk, struct hlist_nulls_head *list) |
271b72c7 | 666 | { |
d894ba18 CG |
667 | if (IS_ENABLED(CONFIG_IPV6) && sk->sk_reuseport && |
668 | sk->sk_family == AF_INET6) | |
669 | hlist_nulls_add_tail_rcu(&sk->sk_nulls_node, list); | |
670 | else | |
671 | hlist_nulls_add_head_rcu(&sk->sk_nulls_node, list); | |
271b72c7 ED |
672 | } |
673 | ||
dc6b9b78 | 674 | static inline void sk_nulls_add_node_rcu(struct sock *sk, struct hlist_nulls_head *list) |
271b72c7 ED |
675 | { |
676 | sock_hold(sk); | |
88ab1932 | 677 | __sk_nulls_add_node_rcu(sk, list); |
271b72c7 ED |
678 | } |
679 | ||
dc6b9b78 | 680 | static inline void __sk_del_bind_node(struct sock *sk) |
1da177e4 LT |
681 | { |
682 | __hlist_del(&sk->sk_bind_node); | |
683 | } | |
684 | ||
dc6b9b78 | 685 | static inline void sk_add_bind_node(struct sock *sk, |
1da177e4 LT |
686 | struct hlist_head *list) |
687 | { | |
688 | hlist_add_head(&sk->sk_bind_node, list); | |
689 | } | |
690 | ||
b67bfe0d SL |
691 | #define sk_for_each(__sk, list) \ |
692 | hlist_for_each_entry(__sk, list, sk_node) | |
693 | #define sk_for_each_rcu(__sk, list) \ | |
694 | hlist_for_each_entry_rcu(__sk, list, sk_node) | |
88ab1932 ED |
695 | #define sk_nulls_for_each(__sk, node, list) \ |
696 | hlist_nulls_for_each_entry(__sk, node, list, sk_nulls_node) | |
697 | #define sk_nulls_for_each_rcu(__sk, node, list) \ | |
698 | hlist_nulls_for_each_entry_rcu(__sk, node, list, sk_nulls_node) | |
b67bfe0d SL |
699 | #define sk_for_each_from(__sk) \ |
700 | hlist_for_each_entry_from(__sk, sk_node) | |
88ab1932 ED |
701 | #define sk_nulls_for_each_from(__sk, node) \ |
702 | if (__sk && ({ node = &(__sk)->sk_nulls_node; 1; })) \ | |
703 | hlist_nulls_for_each_entry_from(__sk, node, sk_nulls_node) | |
b67bfe0d SL |
704 | #define sk_for_each_safe(__sk, tmp, list) \ |
705 | hlist_for_each_entry_safe(__sk, tmp, list, sk_node) | |
706 | #define sk_for_each_bound(__sk, list) \ | |
707 | hlist_for_each_entry(__sk, list, sk_bind_node) | |
1da177e4 | 708 | |
2dc41cff | 709 | /** |
ca065d0c | 710 | * sk_for_each_entry_offset_rcu - iterate over a list at a given struct offset |
2dc41cff DH |
711 | * @tpos: the type * to use as a loop cursor. |
712 | * @pos: the &struct hlist_node to use as a loop cursor. | |
713 | * @head: the head for your list. | |
714 | * @offset: offset of hlist_node within the struct. | |
715 | * | |
716 | */ | |
ca065d0c ED |
717 | #define sk_for_each_entry_offset_rcu(tpos, pos, head, offset) \ |
718 | for (pos = rcu_dereference((head)->first); \ | |
719 | pos != NULL && \ | |
2dc41cff | 720 | ({ tpos = (typeof(*tpos) *)((void *)pos - offset); 1;}); \ |
ca065d0c | 721 | pos = rcu_dereference(pos->next)) |
2dc41cff | 722 | |
c336d148 EB |
723 | static inline struct user_namespace *sk_user_ns(struct sock *sk) |
724 | { | |
725 | /* Careful only use this in a context where these parameters | |
726 | * can not change and must all be valid, such as recvmsg from | |
727 | * userspace. | |
728 | */ | |
729 | return sk->sk_socket->file->f_cred->user_ns; | |
730 | } | |
731 | ||
1da177e4 LT |
732 | /* Sock flags */ |
733 | enum sock_flags { | |
734 | SOCK_DEAD, | |
735 | SOCK_DONE, | |
736 | SOCK_URGINLINE, | |
737 | SOCK_KEEPOPEN, | |
738 | SOCK_LINGER, | |
739 | SOCK_DESTROY, | |
740 | SOCK_BROADCAST, | |
741 | SOCK_TIMESTAMP, | |
742 | SOCK_ZAPPED, | |
743 | SOCK_USE_WRITE_QUEUE, /* whether to call sk->sk_write_space in sock_wfree */ | |
744 | SOCK_DBG, /* %SO_DEBUG setting */ | |
745 | SOCK_RCVTSTAMP, /* %SO_TIMESTAMP setting */ | |
92f37fd2 | 746 | SOCK_RCVTSTAMPNS, /* %SO_TIMESTAMPNS setting */ |
1da177e4 LT |
747 | SOCK_LOCALROUTE, /* route locally only, %SO_DONTROUTE setting */ |
748 | SOCK_QUEUE_SHRUNK, /* write queue has been shrunk recently */ | |
7cb02404 | 749 | SOCK_MEMALLOC, /* VM depends on this socket for swapping */ |
20d49473 | 750 | SOCK_TIMESTAMPING_RX_SOFTWARE, /* %SOF_TIMESTAMPING_RX_SOFTWARE */ |
bcdce719 | 751 | SOCK_FASYNC, /* fasync() active */ |
3b885787 | 752 | SOCK_RXQ_OVFL, |
1cdebb42 | 753 | SOCK_ZEROCOPY, /* buffers from userspace */ |
6e3e939f | 754 | SOCK_WIFI_STATUS, /* push wifi status to userspace */ |
3bdc0eba BG |
755 | SOCK_NOFCS, /* Tell NIC not to do the Ethernet FCS. |
756 | * Will use last 4 bytes of packet sent from | |
757 | * user-space instead. | |
758 | */ | |
d59577b6 | 759 | SOCK_FILTER_LOCKED, /* Filter cannot be changed anymore */ |
7d4c04fc | 760 | SOCK_SELECT_ERR_QUEUE, /* Wake select on error queue */ |
a4298e45 | 761 | SOCK_RCU_FREE, /* wait rcu grace period in sk_destruct() */ |
1da177e4 LT |
762 | }; |
763 | ||
01ce63c9 MRL |
764 | #define SK_FLAGS_TIMESTAMP ((1UL << SOCK_TIMESTAMP) | (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE)) |
765 | ||
53b924b3 RB |
766 | static inline void sock_copy_flags(struct sock *nsk, struct sock *osk) |
767 | { | |
768 | nsk->sk_flags = osk->sk_flags; | |
769 | } | |
770 | ||
1da177e4 LT |
771 | static inline void sock_set_flag(struct sock *sk, enum sock_flags flag) |
772 | { | |
773 | __set_bit(flag, &sk->sk_flags); | |
774 | } | |
775 | ||
776 | static inline void sock_reset_flag(struct sock *sk, enum sock_flags flag) | |
777 | { | |
778 | __clear_bit(flag, &sk->sk_flags); | |
779 | } | |
780 | ||
1b23a5df | 781 | static inline bool sock_flag(const struct sock *sk, enum sock_flags flag) |
1da177e4 LT |
782 | { |
783 | return test_bit(flag, &sk->sk_flags); | |
784 | } | |
785 | ||
c93bdd0e MG |
786 | #ifdef CONFIG_NET |
787 | extern struct static_key memalloc_socks; | |
788 | static inline int sk_memalloc_socks(void) | |
789 | { | |
790 | return static_key_false(&memalloc_socks); | |
791 | } | |
792 | #else | |
793 | ||
794 | static inline int sk_memalloc_socks(void) | |
795 | { | |
796 | return 0; | |
797 | } | |
798 | ||
799 | #endif | |
800 | ||
7450aaf6 | 801 | static inline gfp_t sk_gfp_mask(const struct sock *sk, gfp_t gfp_mask) |
99a1dec7 | 802 | { |
7450aaf6 | 803 | return gfp_mask | (sk->sk_allocation & __GFP_MEMALLOC); |
99a1dec7 MG |
804 | } |
805 | ||
1da177e4 LT |
806 | static inline void sk_acceptq_removed(struct sock *sk) |
807 | { | |
808 | sk->sk_ack_backlog--; | |
809 | } | |
810 | ||
811 | static inline void sk_acceptq_added(struct sock *sk) | |
812 | { | |
813 | sk->sk_ack_backlog++; | |
814 | } | |
815 | ||
dc6b9b78 | 816 | static inline bool sk_acceptq_is_full(const struct sock *sk) |
1da177e4 | 817 | { |
64a14651 | 818 | return sk->sk_ack_backlog > sk->sk_max_ack_backlog; |
1da177e4 LT |
819 | } |
820 | ||
821 | /* | |
822 | * Compute minimal free write space needed to queue new packets. | |
823 | */ | |
dc6b9b78 | 824 | static inline int sk_stream_min_wspace(const struct sock *sk) |
1da177e4 | 825 | { |
8df09ea3 | 826 | return sk->sk_wmem_queued >> 1; |
1da177e4 LT |
827 | } |
828 | ||
dc6b9b78 | 829 | static inline int sk_stream_wspace(const struct sock *sk) |
1da177e4 LT |
830 | { |
831 | return sk->sk_sndbuf - sk->sk_wmem_queued; | |
832 | } | |
833 | ||
69336bd2 | 834 | void sk_stream_write_space(struct sock *sk); |
1da177e4 | 835 | |
8eae939f | 836 | /* OOB backlog add */ |
a3a858ff | 837 | static inline void __sk_add_backlog(struct sock *sk, struct sk_buff *skb) |
9ee6b535 | 838 | { |
7fee226a | 839 | /* dont let skb dst not refcounted, we are going to leave rcu lock */ |
5037e9ef | 840 | skb_dst_force_safe(skb); |
7fee226a ED |
841 | |
842 | if (!sk->sk_backlog.tail) | |
843 | sk->sk_backlog.head = skb; | |
844 | else | |
9ee6b535 | 845 | sk->sk_backlog.tail->next = skb; |
7fee226a ED |
846 | |
847 | sk->sk_backlog.tail = skb; | |
9ee6b535 SH |
848 | skb->next = NULL; |
849 | } | |
1da177e4 | 850 | |
c377411f ED |
851 | /* |
852 | * Take into account size of receive queue and backlog queue | |
0fd7bac6 ED |
853 | * Do not take into account this skb truesize, |
854 | * to allow even a single big packet to come. | |
c377411f | 855 | */ |
274f482d | 856 | static inline bool sk_rcvqueues_full(const struct sock *sk, unsigned int limit) |
c377411f ED |
857 | { |
858 | unsigned int qsize = sk->sk_backlog.len + atomic_read(&sk->sk_rmem_alloc); | |
859 | ||
f545a38f | 860 | return qsize > limit; |
c377411f ED |
861 | } |
862 | ||
8eae939f | 863 | /* The per-socket spinlock must be held here. */ |
f545a38f ED |
864 | static inline __must_check int sk_add_backlog(struct sock *sk, struct sk_buff *skb, |
865 | unsigned int limit) | |
8eae939f | 866 | { |
274f482d | 867 | if (sk_rcvqueues_full(sk, limit)) |
8eae939f ZY |
868 | return -ENOBUFS; |
869 | ||
c7c49b8f ED |
870 | /* |
871 | * If the skb was allocated from pfmemalloc reserves, only | |
872 | * allow SOCK_MEMALLOC sockets to use it as this socket is | |
873 | * helping free memory | |
874 | */ | |
875 | if (skb_pfmemalloc(skb) && !sock_flag(sk, SOCK_MEMALLOC)) | |
876 | return -ENOMEM; | |
877 | ||
a3a858ff | 878 | __sk_add_backlog(sk, skb); |
8eae939f ZY |
879 | sk->sk_backlog.len += skb->truesize; |
880 | return 0; | |
881 | } | |
882 | ||
69336bd2 | 883 | int __sk_backlog_rcv(struct sock *sk, struct sk_buff *skb); |
b4b9e355 | 884 | |
c57943a1 PZ |
885 | static inline int sk_backlog_rcv(struct sock *sk, struct sk_buff *skb) |
886 | { | |
b4b9e355 MG |
887 | if (sk_memalloc_socks() && skb_pfmemalloc(skb)) |
888 | return __sk_backlog_rcv(sk, skb); | |
889 | ||
c57943a1 PZ |
890 | return sk->sk_backlog_rcv(sk, skb); |
891 | } | |
892 | ||
2c8c56e1 ED |
893 | static inline void sk_incoming_cpu_update(struct sock *sk) |
894 | { | |
895 | sk->sk_incoming_cpu = raw_smp_processor_id(); | |
896 | } | |
897 | ||
fe477558 | 898 | static inline void sock_rps_record_flow_hash(__u32 hash) |
c58dc01b DM |
899 | { |
900 | #ifdef CONFIG_RPS | |
901 | struct rps_sock_flow_table *sock_flow_table; | |
902 | ||
903 | rcu_read_lock(); | |
904 | sock_flow_table = rcu_dereference(rps_sock_flow_table); | |
fe477558 | 905 | rps_record_sock_flow(sock_flow_table, hash); |
c58dc01b DM |
906 | rcu_read_unlock(); |
907 | #endif | |
908 | } | |
909 | ||
fe477558 TH |
910 | static inline void sock_rps_record_flow(const struct sock *sk) |
911 | { | |
c9d8ca04 | 912 | #ifdef CONFIG_RPS |
fe477558 | 913 | sock_rps_record_flow_hash(sk->sk_rxhash); |
c9d8ca04 | 914 | #endif |
fe477558 TH |
915 | } |
916 | ||
bdeab991 TH |
917 | static inline void sock_rps_save_rxhash(struct sock *sk, |
918 | const struct sk_buff *skb) | |
c58dc01b DM |
919 | { |
920 | #ifdef CONFIG_RPS | |
567e4b79 | 921 | if (unlikely(sk->sk_rxhash != skb->hash)) |
61b905da | 922 | sk->sk_rxhash = skb->hash; |
c58dc01b DM |
923 | #endif |
924 | } | |
925 | ||
bdeab991 TH |
926 | static inline void sock_rps_reset_rxhash(struct sock *sk) |
927 | { | |
928 | #ifdef CONFIG_RPS | |
bdeab991 TH |
929 | sk->sk_rxhash = 0; |
930 | #endif | |
931 | } | |
932 | ||
d9dc8b0f | 933 | #define sk_wait_event(__sk, __timeo, __condition, __wait) \ |
cfcabdcc SH |
934 | ({ int __rc; \ |
935 | release_sock(__sk); \ | |
936 | __rc = __condition; \ | |
937 | if (!__rc) { \ | |
d9dc8b0f WC |
938 | *(__timeo) = wait_woken(__wait, \ |
939 | TASK_INTERRUPTIBLE, \ | |
940 | *(__timeo)); \ | |
cfcabdcc | 941 | } \ |
d9dc8b0f | 942 | sched_annotate_sleep(); \ |
cfcabdcc SH |
943 | lock_sock(__sk); \ |
944 | __rc = __condition; \ | |
945 | __rc; \ | |
946 | }) | |
1da177e4 | 947 | |
69336bd2 JP |
948 | int sk_stream_wait_connect(struct sock *sk, long *timeo_p); |
949 | int sk_stream_wait_memory(struct sock *sk, long *timeo_p); | |
950 | void sk_stream_wait_close(struct sock *sk, long timeo_p); | |
951 | int sk_stream_error(struct sock *sk, int flags, int err); | |
952 | void sk_stream_kill_queues(struct sock *sk); | |
953 | void sk_set_memalloc(struct sock *sk); | |
954 | void sk_clear_memalloc(struct sock *sk); | |
1da177e4 | 955 | |
d41a69f1 ED |
956 | void __sk_flush_backlog(struct sock *sk); |
957 | ||
958 | static inline bool sk_flush_backlog(struct sock *sk) | |
959 | { | |
960 | if (unlikely(READ_ONCE(sk->sk_backlog.tail))) { | |
961 | __sk_flush_backlog(sk); | |
962 | return true; | |
963 | } | |
964 | return false; | |
965 | } | |
966 | ||
dfbafc99 | 967 | int sk_wait_data(struct sock *sk, long *timeo, const struct sk_buff *skb); |
1da177e4 | 968 | |
60236fdd | 969 | struct request_sock_ops; |
6d6ee43e | 970 | struct timewait_sock_ops; |
ab1e0a13 | 971 | struct inet_hashinfo; |
fc8717ba | 972 | struct raw_hashinfo; |
de477254 | 973 | struct module; |
2e6599cb | 974 | |
f77d6021 ED |
975 | /* |
976 | * caches using SLAB_DESTROY_BY_RCU should let .next pointer from nulls nodes | |
977 | * un-modified. Special care is taken when initializing object to zero. | |
978 | */ | |
979 | static inline void sk_prot_clear_nulls(struct sock *sk, int size) | |
980 | { | |
981 | if (offsetof(struct sock, sk_node.next) != 0) | |
982 | memset(sk, 0, offsetof(struct sock, sk_node.next)); | |
983 | memset(&sk->sk_node.pprev, 0, | |
984 | size - offsetof(struct sock, sk_node.pprev)); | |
985 | } | |
986 | ||
1da177e4 LT |
987 | /* Networking protocol blocks we attach to sockets. |
988 | * socket layer -> transport layer interface | |
1da177e4 LT |
989 | */ |
990 | struct proto { | |
dc6b9b78 | 991 | void (*close)(struct sock *sk, |
1da177e4 LT |
992 | long timeout); |
993 | int (*connect)(struct sock *sk, | |
dc6b9b78 | 994 | struct sockaddr *uaddr, |
1da177e4 LT |
995 | int addr_len); |
996 | int (*disconnect)(struct sock *sk, int flags); | |
997 | ||
dc6b9b78 | 998 | struct sock * (*accept)(struct sock *sk, int flags, int *err); |
1da177e4 LT |
999 | |
1000 | int (*ioctl)(struct sock *sk, int cmd, | |
1001 | unsigned long arg); | |
1002 | int (*init)(struct sock *sk); | |
7d06b2e0 | 1003 | void (*destroy)(struct sock *sk); |
1da177e4 | 1004 | void (*shutdown)(struct sock *sk, int how); |
dc6b9b78 | 1005 | int (*setsockopt)(struct sock *sk, int level, |
1da177e4 | 1006 | int optname, char __user *optval, |
b7058842 | 1007 | unsigned int optlen); |
dc6b9b78 ED |
1008 | int (*getsockopt)(struct sock *sk, int level, |
1009 | int optname, char __user *optval, | |
1010 | int __user *option); | |
af01d537 | 1011 | #ifdef CONFIG_COMPAT |
3fdadf7d DM |
1012 | int (*compat_setsockopt)(struct sock *sk, |
1013 | int level, | |
1014 | int optname, char __user *optval, | |
b7058842 | 1015 | unsigned int optlen); |
3fdadf7d DM |
1016 | int (*compat_getsockopt)(struct sock *sk, |
1017 | int level, | |
1018 | int optname, char __user *optval, | |
1019 | int __user *option); | |
709b46e8 EB |
1020 | int (*compat_ioctl)(struct sock *sk, |
1021 | unsigned int cmd, unsigned long arg); | |
af01d537 | 1022 | #endif |
1b784140 YX |
1023 | int (*sendmsg)(struct sock *sk, struct msghdr *msg, |
1024 | size_t len); | |
1025 | int (*recvmsg)(struct sock *sk, struct msghdr *msg, | |
dc6b9b78 ED |
1026 | size_t len, int noblock, int flags, |
1027 | int *addr_len); | |
1da177e4 LT |
1028 | int (*sendpage)(struct sock *sk, struct page *page, |
1029 | int offset, size_t size, int flags); | |
dc6b9b78 | 1030 | int (*bind)(struct sock *sk, |
1da177e4 LT |
1031 | struct sockaddr *uaddr, int addr_len); |
1032 | ||
dc6b9b78 | 1033 | int (*backlog_rcv) (struct sock *sk, |
1da177e4 LT |
1034 | struct sk_buff *skb); |
1035 | ||
46d3ceab ED |
1036 | void (*release_cb)(struct sock *sk); |
1037 | ||
1da177e4 | 1038 | /* Keeping track of sk's, looking them up, and port selection methods. */ |
086c653f | 1039 | int (*hash)(struct sock *sk); |
1da177e4 | 1040 | void (*unhash)(struct sock *sk); |
719f8358 | 1041 | void (*rehash)(struct sock *sk); |
1da177e4 LT |
1042 | int (*get_port)(struct sock *sk, unsigned short snum); |
1043 | ||
286ab3d4 | 1044 | /* Keeping track of sockets in use */ |
65f76517 | 1045 | #ifdef CONFIG_PROC_FS |
13ff3d6f | 1046 | unsigned int inuse_idx; |
65f76517 | 1047 | #endif |
ebb53d75 | 1048 | |
c9bee3b7 | 1049 | bool (*stream_memory_free)(const struct sock *sk); |
1da177e4 | 1050 | /* Memory pressure */ |
5c52ba17 | 1051 | void (*enter_memory_pressure)(struct sock *sk); |
8d987e5c | 1052 | atomic_long_t *memory_allocated; /* Current allocated memory. */ |
1748376b | 1053 | struct percpu_counter *sockets_allocated; /* Current number of sockets. */ |
1da177e4 LT |
1054 | /* |
1055 | * Pressure flag: try to collapse. | |
1056 | * Technical note: it is used by multiple contexts non atomically. | |
3ab224be | 1057 | * All the __sk_mem_schedule() is of this nature: accounting |
1da177e4 LT |
1058 | * is strict, actions are advisory and have some latency. |
1059 | */ | |
1060 | int *memory_pressure; | |
8d987e5c | 1061 | long *sysctl_mem; |
1da177e4 LT |
1062 | int *sysctl_wmem; |
1063 | int *sysctl_rmem; | |
1064 | int max_header; | |
7ba42910 | 1065 | bool no_autobind; |
1da177e4 | 1066 | |
271b72c7 | 1067 | struct kmem_cache *slab; |
1da177e4 | 1068 | unsigned int obj_size; |
271b72c7 | 1069 | int slab_flags; |
1da177e4 | 1070 | |
dd24c001 | 1071 | struct percpu_counter *orphan_count; |
8feaf0c0 | 1072 | |
60236fdd | 1073 | struct request_sock_ops *rsk_prot; |
6d6ee43e | 1074 | struct timewait_sock_ops *twsk_prot; |
2e6599cb | 1075 | |
39d8cda7 PE |
1076 | union { |
1077 | struct inet_hashinfo *hashinfo; | |
645ca708 | 1078 | struct udp_table *udp_table; |
fc8717ba | 1079 | struct raw_hashinfo *raw_hash; |
39d8cda7 | 1080 | } h; |
ab1e0a13 | 1081 | |
1da177e4 LT |
1082 | struct module *owner; |
1083 | ||
1084 | char name[32]; | |
1085 | ||
1086 | struct list_head node; | |
e6848976 ACM |
1087 | #ifdef SOCK_REFCNT_DEBUG |
1088 | atomic_t socks; | |
e1aab161 | 1089 | #endif |
64be0aed | 1090 | int (*diag_destroy)(struct sock *sk, int err); |
e1aab161 GC |
1091 | }; |
1092 | ||
69336bd2 JP |
1093 | int proto_register(struct proto *prot, int alloc_slab); |
1094 | void proto_unregister(struct proto *prot); | |
1da177e4 | 1095 | |
e6848976 ACM |
1096 | #ifdef SOCK_REFCNT_DEBUG |
1097 | static inline void sk_refcnt_debug_inc(struct sock *sk) | |
1098 | { | |
1099 | atomic_inc(&sk->sk_prot->socks); | |
1100 | } | |
1101 | ||
1102 | static inline void sk_refcnt_debug_dec(struct sock *sk) | |
1103 | { | |
1104 | atomic_dec(&sk->sk_prot->socks); | |
1105 | printk(KERN_DEBUG "%s socket %p released, %d are still alive\n", | |
1106 | sk->sk_prot->name, sk, atomic_read(&sk->sk_prot->socks)); | |
1107 | } | |
1108 | ||
dec34fb0 | 1109 | static inline void sk_refcnt_debug_release(const struct sock *sk) |
e6848976 ACM |
1110 | { |
1111 | if (atomic_read(&sk->sk_refcnt) != 1) | |
1112 | printk(KERN_DEBUG "Destruction of the %s socket %p delayed, refcnt=%d\n", | |
1113 | sk->sk_prot->name, sk, atomic_read(&sk->sk_refcnt)); | |
1114 | } | |
1115 | #else /* SOCK_REFCNT_DEBUG */ | |
1116 | #define sk_refcnt_debug_inc(sk) do { } while (0) | |
1117 | #define sk_refcnt_debug_dec(sk) do { } while (0) | |
1118 | #define sk_refcnt_debug_release(sk) do { } while (0) | |
1119 | #endif /* SOCK_REFCNT_DEBUG */ | |
1120 | ||
c9bee3b7 ED |
1121 | static inline bool sk_stream_memory_free(const struct sock *sk) |
1122 | { | |
1123 | if (sk->sk_wmem_queued >= sk->sk_sndbuf) | |
1124 | return false; | |
1125 | ||
1126 | return sk->sk_prot->stream_memory_free ? | |
1127 | sk->sk_prot->stream_memory_free(sk) : true; | |
1128 | } | |
1129 | ||
64dc6130 ED |
1130 | static inline bool sk_stream_is_writeable(const struct sock *sk) |
1131 | { | |
c9bee3b7 ED |
1132 | return sk_stream_wspace(sk) >= sk_stream_min_wspace(sk) && |
1133 | sk_stream_memory_free(sk); | |
64dc6130 | 1134 | } |
e1aab161 | 1135 | |
54fd9c2d DB |
1136 | static inline int sk_under_cgroup_hierarchy(struct sock *sk, |
1137 | struct cgroup *ancestor) | |
1138 | { | |
1139 | #ifdef CONFIG_SOCK_CGROUP_DATA | |
1140 | return cgroup_is_descendant(sock_cgroup_ptr(&sk->sk_cgrp_data), | |
1141 | ancestor); | |
1142 | #else | |
1143 | return -ENOTSUPP; | |
1144 | #endif | |
1145 | } | |
c9bee3b7 | 1146 | |
180d8cd9 GC |
1147 | static inline bool sk_has_memory_pressure(const struct sock *sk) |
1148 | { | |
1149 | return sk->sk_prot->memory_pressure != NULL; | |
1150 | } | |
1151 | ||
1152 | static inline bool sk_under_memory_pressure(const struct sock *sk) | |
1153 | { | |
1154 | if (!sk->sk_prot->memory_pressure) | |
1155 | return false; | |
e1aab161 | 1156 | |
baac50bb JW |
1157 | if (mem_cgroup_sockets_enabled && sk->sk_memcg && |
1158 | mem_cgroup_under_socket_pressure(sk->sk_memcg)) | |
e805605c | 1159 | return true; |
e1aab161 | 1160 | |
35b87f6c | 1161 | return !!*sk->sk_prot->memory_pressure; |
180d8cd9 GC |
1162 | } |
1163 | ||
1164 | static inline void sk_leave_memory_pressure(struct sock *sk) | |
1165 | { | |
1166 | int *memory_pressure = sk->sk_prot->memory_pressure; | |
1167 | ||
e1aab161 GC |
1168 | if (!memory_pressure) |
1169 | return; | |
1170 | ||
1171 | if (*memory_pressure) | |
180d8cd9 GC |
1172 | *memory_pressure = 0; |
1173 | } | |
1174 | ||
1175 | static inline void sk_enter_memory_pressure(struct sock *sk) | |
1176 | { | |
e1aab161 GC |
1177 | if (!sk->sk_prot->enter_memory_pressure) |
1178 | return; | |
1179 | ||
e1aab161 | 1180 | sk->sk_prot->enter_memory_pressure(sk); |
180d8cd9 GC |
1181 | } |
1182 | ||
180d8cd9 GC |
1183 | static inline long |
1184 | sk_memory_allocated(const struct sock *sk) | |
1185 | { | |
e805605c | 1186 | return atomic_long_read(sk->sk_prot->memory_allocated); |
180d8cd9 GC |
1187 | } |
1188 | ||
1189 | static inline long | |
e805605c | 1190 | sk_memory_allocated_add(struct sock *sk, int amt) |
180d8cd9 | 1191 | { |
e805605c | 1192 | return atomic_long_add_return(amt, sk->sk_prot->memory_allocated); |
180d8cd9 GC |
1193 | } |
1194 | ||
1195 | static inline void | |
0e90b31f | 1196 | sk_memory_allocated_sub(struct sock *sk, int amt) |
180d8cd9 | 1197 | { |
e805605c | 1198 | atomic_long_sub(amt, sk->sk_prot->memory_allocated); |
180d8cd9 GC |
1199 | } |
1200 | ||
1201 | static inline void sk_sockets_allocated_dec(struct sock *sk) | |
1202 | { | |
af95d7df | 1203 | percpu_counter_dec(sk->sk_prot->sockets_allocated); |
180d8cd9 GC |
1204 | } |
1205 | ||
1206 | static inline void sk_sockets_allocated_inc(struct sock *sk) | |
1207 | { | |
af95d7df | 1208 | percpu_counter_inc(sk->sk_prot->sockets_allocated); |
180d8cd9 GC |
1209 | } |
1210 | ||
1211 | static inline int | |
1212 | sk_sockets_allocated_read_positive(struct sock *sk) | |
1213 | { | |
af95d7df | 1214 | return percpu_counter_read_positive(sk->sk_prot->sockets_allocated); |
180d8cd9 GC |
1215 | } |
1216 | ||
1217 | static inline int | |
1218 | proto_sockets_allocated_sum_positive(struct proto *prot) | |
1219 | { | |
1220 | return percpu_counter_sum_positive(prot->sockets_allocated); | |
1221 | } | |
1222 | ||
1223 | static inline long | |
1224 | proto_memory_allocated(struct proto *prot) | |
1225 | { | |
1226 | return atomic_long_read(prot->memory_allocated); | |
1227 | } | |
1228 | ||
1229 | static inline bool | |
1230 | proto_memory_pressure(struct proto *prot) | |
1231 | { | |
1232 | if (!prot->memory_pressure) | |
1233 | return false; | |
1234 | return !!*prot->memory_pressure; | |
1235 | } | |
1236 | ||
65f76517 ED |
1237 | |
1238 | #ifdef CONFIG_PROC_FS | |
1da177e4 | 1239 | /* Called with local bh disabled */ |
69336bd2 JP |
1240 | void sock_prot_inuse_add(struct net *net, struct proto *prot, int inc); |
1241 | int sock_prot_inuse_get(struct net *net, struct proto *proto); | |
65f76517 | 1242 | #else |
dc6b9b78 | 1243 | static inline void sock_prot_inuse_add(struct net *net, struct proto *prot, |
c29a0bc4 | 1244 | int inc) |
65f76517 ED |
1245 | { |
1246 | } | |
65f76517 ED |
1247 | #endif |
1248 | ||
1da177e4 | 1249 | |
614c6cb4 ACM |
1250 | /* With per-bucket locks this operation is not-atomic, so that |
1251 | * this version is not worse. | |
1252 | */ | |
086c653f | 1253 | static inline int __sk_prot_rehash(struct sock *sk) |
614c6cb4 ACM |
1254 | { |
1255 | sk->sk_prot->unhash(sk); | |
086c653f | 1256 | return sk->sk_prot->hash(sk); |
614c6cb4 ACM |
1257 | } |
1258 | ||
1da177e4 LT |
1259 | /* About 10 seconds */ |
1260 | #define SOCK_DESTROY_TIME (10*HZ) | |
1261 | ||
1262 | /* Sockets 0-1023 can't be bound to unless you are superuser */ | |
1263 | #define PROT_SOCK 1024 | |
1264 | ||
1265 | #define SHUTDOWN_MASK 3 | |
1266 | #define RCV_SHUTDOWN 1 | |
1267 | #define SEND_SHUTDOWN 2 | |
1268 | ||
1269 | #define SOCK_SNDBUF_LOCK 1 | |
1270 | #define SOCK_RCVBUF_LOCK 2 | |
1271 | #define SOCK_BINDADDR_LOCK 4 | |
1272 | #define SOCK_BINDPORT_LOCK 8 | |
1273 | ||
1da177e4 LT |
1274 | struct socket_alloc { |
1275 | struct socket socket; | |
1276 | struct inode vfs_inode; | |
1277 | }; | |
1278 | ||
1279 | static inline struct socket *SOCKET_I(struct inode *inode) | |
1280 | { | |
1281 | return &container_of(inode, struct socket_alloc, vfs_inode)->socket; | |
1282 | } | |
1283 | ||
1284 | static inline struct inode *SOCK_INODE(struct socket *socket) | |
1285 | { | |
1286 | return &container_of(socket, struct socket_alloc, socket)->vfs_inode; | |
1287 | } | |
1288 | ||
3ab224be HA |
1289 | /* |
1290 | * Functions for memory accounting | |
1291 | */ | |
f8c3bf00 | 1292 | int __sk_mem_raise_allocated(struct sock *sk, int size, int amt, int kind); |
69336bd2 | 1293 | int __sk_mem_schedule(struct sock *sk, int size, int kind); |
f8c3bf00 | 1294 | void __sk_mem_reduce_allocated(struct sock *sk, int amount); |
1a24e04e | 1295 | void __sk_mem_reclaim(struct sock *sk, int amount); |
1da177e4 | 1296 | |
bd68a2a8 ED |
1297 | /* We used to have PAGE_SIZE here, but systems with 64KB pages |
1298 | * do not necessarily have 16x time more memory than 4KB ones. | |
1299 | */ | |
1300 | #define SK_MEM_QUANTUM 4096 | |
3ab224be HA |
1301 | #define SK_MEM_QUANTUM_SHIFT ilog2(SK_MEM_QUANTUM) |
1302 | #define SK_MEM_SEND 0 | |
1303 | #define SK_MEM_RECV 1 | |
1da177e4 | 1304 | |
bd68a2a8 ED |
1305 | /* sysctl_mem values are in pages, we convert them in SK_MEM_QUANTUM units */ |
1306 | static inline long sk_prot_mem_limits(const struct sock *sk, int index) | |
1307 | { | |
1308 | long val = sk->sk_prot->sysctl_mem[index]; | |
1309 | ||
1310 | #if PAGE_SIZE > SK_MEM_QUANTUM | |
1311 | val <<= PAGE_SHIFT - SK_MEM_QUANTUM_SHIFT; | |
1312 | #elif PAGE_SIZE < SK_MEM_QUANTUM | |
1313 | val >>= SK_MEM_QUANTUM_SHIFT - PAGE_SHIFT; | |
1314 | #endif | |
1315 | return val; | |
1316 | } | |
1317 | ||
3ab224be | 1318 | static inline int sk_mem_pages(int amt) |
1da177e4 | 1319 | { |
3ab224be | 1320 | return (amt + SK_MEM_QUANTUM - 1) >> SK_MEM_QUANTUM_SHIFT; |
1da177e4 LT |
1321 | } |
1322 | ||
dc6b9b78 | 1323 | static inline bool sk_has_account(struct sock *sk) |
1da177e4 | 1324 | { |
3ab224be HA |
1325 | /* return true if protocol supports memory accounting */ |
1326 | return !!sk->sk_prot->memory_allocated; | |
1da177e4 LT |
1327 | } |
1328 | ||
dc6b9b78 | 1329 | static inline bool sk_wmem_schedule(struct sock *sk, int size) |
1da177e4 | 1330 | { |
3ab224be | 1331 | if (!sk_has_account(sk)) |
dc6b9b78 | 1332 | return true; |
3ab224be HA |
1333 | return size <= sk->sk_forward_alloc || |
1334 | __sk_mem_schedule(sk, size, SK_MEM_SEND); | |
1da177e4 LT |
1335 | } |
1336 | ||
c76562b6 | 1337 | static inline bool |
35c448a8 | 1338 | sk_rmem_schedule(struct sock *sk, struct sk_buff *skb, int size) |
d80d99d6 | 1339 | { |
3ab224be | 1340 | if (!sk_has_account(sk)) |
dc6b9b78 | 1341 | return true; |
c76562b6 MG |
1342 | return size<= sk->sk_forward_alloc || |
1343 | __sk_mem_schedule(sk, size, SK_MEM_RECV) || | |
1344 | skb_pfmemalloc(skb); | |
3ab224be HA |
1345 | } |
1346 | ||
1347 | static inline void sk_mem_reclaim(struct sock *sk) | |
1348 | { | |
1349 | if (!sk_has_account(sk)) | |
1350 | return; | |
1351 | if (sk->sk_forward_alloc >= SK_MEM_QUANTUM) | |
1a24e04e | 1352 | __sk_mem_reclaim(sk, sk->sk_forward_alloc); |
3ab224be HA |
1353 | } |
1354 | ||
9993e7d3 DM |
1355 | static inline void sk_mem_reclaim_partial(struct sock *sk) |
1356 | { | |
1357 | if (!sk_has_account(sk)) | |
1358 | return; | |
1359 | if (sk->sk_forward_alloc > SK_MEM_QUANTUM) | |
1a24e04e | 1360 | __sk_mem_reclaim(sk, sk->sk_forward_alloc - 1); |
9993e7d3 DM |
1361 | } |
1362 | ||
3ab224be HA |
1363 | static inline void sk_mem_charge(struct sock *sk, int size) |
1364 | { | |
1365 | if (!sk_has_account(sk)) | |
1366 | return; | |
1367 | sk->sk_forward_alloc -= size; | |
1368 | } | |
1369 | ||
1370 | static inline void sk_mem_uncharge(struct sock *sk, int size) | |
1371 | { | |
1372 | if (!sk_has_account(sk)) | |
1373 | return; | |
1374 | sk->sk_forward_alloc += size; | |
20c64d5c ED |
1375 | |
1376 | /* Avoid a possible overflow. | |
1377 | * TCP send queues can make this happen, if sk_mem_reclaim() | |
1378 | * is not called and more than 2 GBytes are released at once. | |
1379 | * | |
1380 | * If we reach 2 MBytes, reclaim 1 MBytes right now, there is | |
1381 | * no need to hold that much forward allocation anyway. | |
1382 | */ | |
1383 | if (unlikely(sk->sk_forward_alloc >= 1 << 21)) | |
1384 | __sk_mem_reclaim(sk, 1 << 20); | |
3ab224be HA |
1385 | } |
1386 | ||
1387 | static inline void sk_wmem_free_skb(struct sock *sk, struct sk_buff *skb) | |
1388 | { | |
3ab224be HA |
1389 | sock_set_flag(sk, SOCK_QUEUE_SHRUNK); |
1390 | sk->sk_wmem_queued -= skb->truesize; | |
1391 | sk_mem_uncharge(sk, skb->truesize); | |
1392 | __kfree_skb(skb); | |
d80d99d6 HX |
1393 | } |
1394 | ||
c3f9b018 ED |
1395 | static inline void sock_release_ownership(struct sock *sk) |
1396 | { | |
61881cfb HFS |
1397 | if (sk->sk_lock.owned) { |
1398 | sk->sk_lock.owned = 0; | |
1399 | ||
1400 | /* The sk_lock has mutex_unlock() semantics: */ | |
1401 | mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_); | |
1402 | } | |
c3f9b018 ED |
1403 | } |
1404 | ||
ed07536e PZ |
1405 | /* |
1406 | * Macro so as to not evaluate some arguments when | |
1407 | * lockdep is not enabled. | |
1408 | * | |
1409 | * Mark both the sk_lock and the sk_lock.slock as a | |
1410 | * per-address-family lock class. | |
1411 | */ | |
dc6b9b78 | 1412 | #define sock_lock_init_class_and_name(sk, sname, skey, name, key) \ |
ed07536e | 1413 | do { \ |
e8f6fbf6 | 1414 | sk->sk_lock.owned = 0; \ |
ed07536e PZ |
1415 | init_waitqueue_head(&sk->sk_lock.wq); \ |
1416 | spin_lock_init(&(sk)->sk_lock.slock); \ | |
1417 | debug_check_no_locks_freed((void *)&(sk)->sk_lock, \ | |
1418 | sizeof((sk)->sk_lock)); \ | |
1419 | lockdep_set_class_and_name(&(sk)->sk_lock.slock, \ | |
dc6b9b78 | 1420 | (skey), (sname)); \ |
ed07536e PZ |
1421 | lockdep_init_map(&(sk)->sk_lock.dep_map, (name), (key), 0); \ |
1422 | } while (0) | |
1423 | ||
b33b0a1b | 1424 | #ifdef CONFIG_LOCKDEP |
03be9822 | 1425 | static inline bool lockdep_sock_is_held(const struct sock *csk) |
1e1d04e6 HFS |
1426 | { |
1427 | struct sock *sk = (struct sock *)csk; | |
1428 | ||
1429 | return lockdep_is_held(&sk->sk_lock) || | |
1430 | lockdep_is_held(&sk->sk_lock.slock); | |
1431 | } | |
b33b0a1b | 1432 | #endif |
1e1d04e6 | 1433 | |
69336bd2 | 1434 | void lock_sock_nested(struct sock *sk, int subclass); |
fcc70d5f PZ |
1435 | |
1436 | static inline void lock_sock(struct sock *sk) | |
1437 | { | |
1438 | lock_sock_nested(sk, 0); | |
1439 | } | |
1440 | ||
69336bd2 | 1441 | void release_sock(struct sock *sk); |
1da177e4 LT |
1442 | |
1443 | /* BH context may only use the following locking interface. */ | |
1444 | #define bh_lock_sock(__sk) spin_lock(&((__sk)->sk_lock.slock)) | |
c6366184 IM |
1445 | #define bh_lock_sock_nested(__sk) \ |
1446 | spin_lock_nested(&((__sk)->sk_lock.slock), \ | |
1447 | SINGLE_DEPTH_NESTING) | |
1da177e4 LT |
1448 | #define bh_unlock_sock(__sk) spin_unlock(&((__sk)->sk_lock.slock)) |
1449 | ||
69336bd2 | 1450 | bool lock_sock_fast(struct sock *sk); |
8a74ad60 ED |
1451 | /** |
1452 | * unlock_sock_fast - complement of lock_sock_fast | |
1453 | * @sk: socket | |
1454 | * @slow: slow mode | |
1455 | * | |
1456 | * fast unlock socket for user context. | |
1457 | * If slow mode is on, we call regular release_sock() | |
1458 | */ | |
1459 | static inline void unlock_sock_fast(struct sock *sk, bool slow) | |
4b0b72f7 | 1460 | { |
8a74ad60 ED |
1461 | if (slow) |
1462 | release_sock(sk); | |
1463 | else | |
1464 | spin_unlock_bh(&sk->sk_lock.slock); | |
4b0b72f7 ED |
1465 | } |
1466 | ||
fafc4e1e HFS |
1467 | /* Used by processes to "lock" a socket state, so that |
1468 | * interrupts and bottom half handlers won't change it | |
1469 | * from under us. It essentially blocks any incoming | |
1470 | * packets, so that we won't get any new data or any | |
1471 | * packets that change the state of the socket. | |
1472 | * | |
1473 | * While locked, BH processing will add new packets to | |
1474 | * the backlog queue. This queue is processed by the | |
1475 | * owner of the socket lock right before it is released. | |
1476 | * | |
1477 | * Since ~2.3.5 it is also exclusive sleep lock serializing | |
1478 | * accesses from user process context. | |
1479 | */ | |
1480 | ||
46cc6e49 | 1481 | static inline void sock_owned_by_me(const struct sock *sk) |
fafc4e1e HFS |
1482 | { |
1483 | #ifdef CONFIG_LOCKDEP | |
5e91f6ce | 1484 | WARN_ON_ONCE(!lockdep_sock_is_held(sk) && debug_locks); |
fafc4e1e | 1485 | #endif |
46cc6e49 ED |
1486 | } |
1487 | ||
1488 | static inline bool sock_owned_by_user(const struct sock *sk) | |
1489 | { | |
1490 | sock_owned_by_me(sk); | |
fafc4e1e HFS |
1491 | return sk->sk_lock.owned; |
1492 | } | |
1493 | ||
1494 | /* no reclassification while locks are held */ | |
1495 | static inline bool sock_allow_reclassification(const struct sock *csk) | |
1496 | { | |
1497 | struct sock *sk = (struct sock *)csk; | |
1498 | ||
1499 | return !sk->sk_lock.owned && !spin_is_locked(&sk->sk_lock.slock); | |
1500 | } | |
4b0b72f7 | 1501 | |
69336bd2 | 1502 | struct sock *sk_alloc(struct net *net, int family, gfp_t priority, |
11aa9c28 | 1503 | struct proto *prot, int kern); |
69336bd2 | 1504 | void sk_free(struct sock *sk); |
eb4cb008 | 1505 | void sk_destruct(struct sock *sk); |
69336bd2 JP |
1506 | struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority); |
1507 | ||
1508 | struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force, | |
1509 | gfp_t priority); | |
1d2077ac | 1510 | void __sock_wfree(struct sk_buff *skb); |
69336bd2 JP |
1511 | void sock_wfree(struct sk_buff *skb); |
1512 | void skb_orphan_partial(struct sk_buff *skb); | |
1513 | void sock_rfree(struct sk_buff *skb); | |
62bccb8c | 1514 | void sock_efree(struct sk_buff *skb); |
82eabd9e | 1515 | #ifdef CONFIG_INET |
69336bd2 | 1516 | void sock_edemux(struct sk_buff *skb); |
82eabd9e AD |
1517 | #else |
1518 | #define sock_edemux(skb) sock_efree(skb) | |
1519 | #endif | |
69336bd2 JP |
1520 | |
1521 | int sock_setsockopt(struct socket *sock, int level, int op, | |
1522 | char __user *optval, unsigned int optlen); | |
1523 | ||
1524 | int sock_getsockopt(struct socket *sock, int level, int op, | |
1525 | char __user *optval, int __user *optlen); | |
1526 | struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size, | |
1527 | int noblock, int *errcode); | |
1528 | struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len, | |
1529 | unsigned long data_len, int noblock, | |
1530 | int *errcode, int max_page_order); | |
1531 | void *sock_kmalloc(struct sock *sk, int size, gfp_t priority); | |
1532 | void sock_kfree_s(struct sock *sk, void *mem, int size); | |
79e88659 | 1533 | void sock_kzfree_s(struct sock *sk, void *mem, int size); |
69336bd2 | 1534 | void sk_send_sigurg(struct sock *sk); |
1da177e4 | 1535 | |
f28ea365 EJ |
1536 | struct sockcm_cookie { |
1537 | u32 mark; | |
3dd17e63 | 1538 | u16 tsflags; |
f28ea365 EJ |
1539 | }; |
1540 | ||
39771b12 WB |
1541 | int __sock_cmsg_send(struct sock *sk, struct msghdr *msg, struct cmsghdr *cmsg, |
1542 | struct sockcm_cookie *sockc); | |
f28ea365 EJ |
1543 | int sock_cmsg_send(struct sock *sk, struct msghdr *msg, |
1544 | struct sockcm_cookie *sockc); | |
1545 | ||
1da177e4 LT |
1546 | /* |
1547 | * Functions to fill in entries in struct proto_ops when a protocol | |
1548 | * does not implement a particular function. | |
1549 | */ | |
69336bd2 JP |
1550 | int sock_no_bind(struct socket *, struct sockaddr *, int); |
1551 | int sock_no_connect(struct socket *, struct sockaddr *, int, int); | |
1552 | int sock_no_socketpair(struct socket *, struct socket *); | |
1553 | int sock_no_accept(struct socket *, struct socket *, int); | |
1554 | int sock_no_getname(struct socket *, struct sockaddr *, int *, int); | |
1555 | unsigned int sock_no_poll(struct file *, struct socket *, | |
1556 | struct poll_table_struct *); | |
1557 | int sock_no_ioctl(struct socket *, unsigned int, unsigned long); | |
1558 | int sock_no_listen(struct socket *, int); | |
1559 | int sock_no_shutdown(struct socket *, int); | |
1560 | int sock_no_getsockopt(struct socket *, int , int, char __user *, int __user *); | |
1561 | int sock_no_setsockopt(struct socket *, int, int, char __user *, unsigned int); | |
1b784140 YX |
1562 | int sock_no_sendmsg(struct socket *, struct msghdr *, size_t); |
1563 | int sock_no_recvmsg(struct socket *, struct msghdr *, size_t, int); | |
69336bd2 JP |
1564 | int sock_no_mmap(struct file *file, struct socket *sock, |
1565 | struct vm_area_struct *vma); | |
1566 | ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, | |
1567 | size_t size, int flags); | |
1da177e4 LT |
1568 | |
1569 | /* | |
1570 | * Functions to fill in entries in struct proto_ops when a protocol | |
1571 | * uses the inet style. | |
1572 | */ | |
69336bd2 | 1573 | int sock_common_getsockopt(struct socket *sock, int level, int optname, |
1da177e4 | 1574 | char __user *optval, int __user *optlen); |
1b784140 YX |
1575 | int sock_common_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, |
1576 | int flags); | |
69336bd2 | 1577 | int sock_common_setsockopt(struct socket *sock, int level, int optname, |
b7058842 | 1578 | char __user *optval, unsigned int optlen); |
69336bd2 | 1579 | int compat_sock_common_getsockopt(struct socket *sock, int level, |
3fdadf7d | 1580 | int optname, char __user *optval, int __user *optlen); |
69336bd2 | 1581 | int compat_sock_common_setsockopt(struct socket *sock, int level, |
b7058842 | 1582 | int optname, char __user *optval, unsigned int optlen); |
1da177e4 | 1583 | |
69336bd2 | 1584 | void sk_common_release(struct sock *sk); |
1da177e4 LT |
1585 | |
1586 | /* | |
1587 | * Default socket callbacks and setup code | |
1588 | */ | |
dc6b9b78 | 1589 | |
1da177e4 | 1590 | /* Initialise core socket variables */ |
69336bd2 | 1591 | void sock_init_data(struct socket *sock, struct sock *sk); |
1da177e4 | 1592 | |
1da177e4 LT |
1593 | /* |
1594 | * Socket reference counting postulates. | |
1595 | * | |
1596 | * * Each user of socket SHOULD hold a reference count. | |
1597 | * * Each access point to socket (an hash table bucket, reference from a list, | |
1598 | * running timer, skb in flight MUST hold a reference count. | |
1599 | * * When reference count hits 0, it means it will never increase back. | |
1600 | * * When reference count hits 0, it means that no references from | |
1601 | * outside exist to this socket and current process on current CPU | |
1602 | * is last user and may/should destroy this socket. | |
1603 | * * sk_free is called from any context: process, BH, IRQ. When | |
1604 | * it is called, socket has no references from outside -> sk_free | |
1605 | * may release descendant resources allocated by the socket, but | |
1606 | * to the time when it is called, socket is NOT referenced by any | |
1607 | * hash tables, lists etc. | |
1608 | * * Packets, delivered from outside (from network or from another process) | |
1609 | * and enqueued on receive/error queues SHOULD NOT grab reference count, | |
1610 | * when they sit in queue. Otherwise, packets will leak to hole, when | |
1611 | * socket is looked up by one cpu and unhasing is made by another CPU. | |
1612 | * It is true for udp/raw, netlink (leak to receive and error queues), tcp | |
1613 | * (leak to backlog). Packet socket does all the processing inside | |
1614 | * BR_NETPROTO_LOCK, so that it has not this race condition. UNIX sockets | |
1615 | * use separate SMP lock, so that they are prone too. | |
1616 | */ | |
1617 | ||
1618 | /* Ungrab socket and destroy it, if it was the last reference. */ | |
1619 | static inline void sock_put(struct sock *sk) | |
1620 | { | |
1621 | if (atomic_dec_and_test(&sk->sk_refcnt)) | |
1622 | sk_free(sk); | |
1623 | } | |
05dbc7b5 | 1624 | /* Generic version of sock_put(), dealing with all sockets |
41b822c5 | 1625 | * (TCP_TIMEWAIT, TCP_NEW_SYN_RECV, ESTABLISHED...) |
05dbc7b5 ED |
1626 | */ |
1627 | void sock_gen_put(struct sock *sk); | |
1da177e4 | 1628 | |
4f0c40d9 | 1629 | int __sk_receive_skb(struct sock *sk, struct sk_buff *skb, const int nested, |
c3f24cfb | 1630 | unsigned int trim_cap, bool refcounted); |
4f0c40d9 WB |
1631 | static inline int sk_receive_skb(struct sock *sk, struct sk_buff *skb, |
1632 | const int nested) | |
1633 | { | |
c3f24cfb | 1634 | return __sk_receive_skb(sk, skb, nested, 1, true); |
4f0c40d9 | 1635 | } |
25995ff5 | 1636 | |
e022f0b4 KK |
1637 | static inline void sk_tx_queue_set(struct sock *sk, int tx_queue) |
1638 | { | |
1639 | sk->sk_tx_queue_mapping = tx_queue; | |
1640 | } | |
1641 | ||
1642 | static inline void sk_tx_queue_clear(struct sock *sk) | |
1643 | { | |
1644 | sk->sk_tx_queue_mapping = -1; | |
1645 | } | |
1646 | ||
1647 | static inline int sk_tx_queue_get(const struct sock *sk) | |
1648 | { | |
b0f77d0e | 1649 | return sk ? sk->sk_tx_queue_mapping : -1; |
e022f0b4 KK |
1650 | } |
1651 | ||
972692e0 DM |
1652 | static inline void sk_set_socket(struct sock *sk, struct socket *sock) |
1653 | { | |
e022f0b4 | 1654 | sk_tx_queue_clear(sk); |
972692e0 DM |
1655 | sk->sk_socket = sock; |
1656 | } | |
1657 | ||
aa395145 ED |
1658 | static inline wait_queue_head_t *sk_sleep(struct sock *sk) |
1659 | { | |
eaefd110 ED |
1660 | BUILD_BUG_ON(offsetof(struct socket_wq, wait) != 0); |
1661 | return &rcu_dereference_raw(sk->sk_wq)->wait; | |
aa395145 | 1662 | } |
1da177e4 LT |
1663 | /* Detach socket from process context. |
1664 | * Announce socket dead, detach it from wait queue and inode. | |
1665 | * Note that parent inode held reference count on this struct sock, | |
1666 | * we do not release it in this function, because protocol | |
1667 | * probably wants some additional cleanups or even continuing | |
1668 | * to work with this socket (TCP). | |
1669 | */ | |
1670 | static inline void sock_orphan(struct sock *sk) | |
1671 | { | |
1672 | write_lock_bh(&sk->sk_callback_lock); | |
1673 | sock_set_flag(sk, SOCK_DEAD); | |
972692e0 | 1674 | sk_set_socket(sk, NULL); |
43815482 | 1675 | sk->sk_wq = NULL; |
1da177e4 LT |
1676 | write_unlock_bh(&sk->sk_callback_lock); |
1677 | } | |
1678 | ||
1679 | static inline void sock_graft(struct sock *sk, struct socket *parent) | |
1680 | { | |
1681 | write_lock_bh(&sk->sk_callback_lock); | |
eaefd110 | 1682 | sk->sk_wq = parent->wq; |
1da177e4 | 1683 | parent->sk = sk; |
972692e0 | 1684 | sk_set_socket(sk, parent); |
86741ec2 | 1685 | sk->sk_uid = SOCK_INODE(parent)->i_uid; |
4237c75c | 1686 | security_sock_graft(sk, parent); |
1da177e4 LT |
1687 | write_unlock_bh(&sk->sk_callback_lock); |
1688 | } | |
1689 | ||
69336bd2 JP |
1690 | kuid_t sock_i_uid(struct sock *sk); |
1691 | unsigned long sock_i_ino(struct sock *sk); | |
1da177e4 | 1692 | |
86741ec2 LC |
1693 | static inline kuid_t sock_net_uid(const struct net *net, const struct sock *sk) |
1694 | { | |
1695 | return sk ? sk->sk_uid : make_kuid(net->user_ns, 0); | |
1696 | } | |
1697 | ||
58d607d3 | 1698 | static inline u32 net_tx_rndhash(void) |
877d1f62 | 1699 | { |
58d607d3 ED |
1700 | u32 v = prandom_u32(); |
1701 | ||
1702 | return v ?: 1; | |
1703 | } | |
877d1f62 | 1704 | |
58d607d3 ED |
1705 | static inline void sk_set_txhash(struct sock *sk) |
1706 | { | |
1707 | sk->sk_txhash = net_tx_rndhash(); | |
877d1f62 TH |
1708 | } |
1709 | ||
265f94ff TH |
1710 | static inline void sk_rethink_txhash(struct sock *sk) |
1711 | { | |
1712 | if (sk->sk_txhash) | |
1713 | sk_set_txhash(sk); | |
1714 | } | |
1715 | ||
1da177e4 LT |
1716 | static inline struct dst_entry * |
1717 | __sk_dst_get(struct sock *sk) | |
1718 | { | |
1e1d04e6 HFS |
1719 | return rcu_dereference_check(sk->sk_dst_cache, |
1720 | lockdep_sock_is_held(sk)); | |
1da177e4 LT |
1721 | } |
1722 | ||
1723 | static inline struct dst_entry * | |
1724 | sk_dst_get(struct sock *sk) | |
1725 | { | |
1726 | struct dst_entry *dst; | |
1727 | ||
b6c6712a ED |
1728 | rcu_read_lock(); |
1729 | dst = rcu_dereference(sk->sk_dst_cache); | |
f8864972 ED |
1730 | if (dst && !atomic_inc_not_zero(&dst->__refcnt)) |
1731 | dst = NULL; | |
b6c6712a | 1732 | rcu_read_unlock(); |
1da177e4 LT |
1733 | return dst; |
1734 | } | |
1735 | ||
b6c6712a ED |
1736 | static inline void dst_negative_advice(struct sock *sk) |
1737 | { | |
1738 | struct dst_entry *ndst, *dst = __sk_dst_get(sk); | |
1739 | ||
265f94ff TH |
1740 | sk_rethink_txhash(sk); |
1741 | ||
b6c6712a ED |
1742 | if (dst && dst->ops->negative_advice) { |
1743 | ndst = dst->ops->negative_advice(dst); | |
1744 | ||
1745 | if (ndst != dst) { | |
1746 | rcu_assign_pointer(sk->sk_dst_cache, ndst); | |
0a6957e7 | 1747 | sk_tx_queue_clear(sk); |
b6c6712a ED |
1748 | } |
1749 | } | |
1750 | } | |
1751 | ||
1da177e4 LT |
1752 | static inline void |
1753 | __sk_dst_set(struct sock *sk, struct dst_entry *dst) | |
1754 | { | |
1755 | struct dst_entry *old_dst; | |
1756 | ||
e022f0b4 | 1757 | sk_tx_queue_clear(sk); |
0b53ff2e ED |
1758 | /* |
1759 | * This can be called while sk is owned by the caller only, | |
1760 | * with no state that can be checked in a rcu_dereference_check() cond | |
1761 | */ | |
1762 | old_dst = rcu_dereference_raw(sk->sk_dst_cache); | |
b6c6712a | 1763 | rcu_assign_pointer(sk->sk_dst_cache, dst); |
1da177e4 LT |
1764 | dst_release(old_dst); |
1765 | } | |
1766 | ||
1767 | static inline void | |
1768 | sk_dst_set(struct sock *sk, struct dst_entry *dst) | |
1769 | { | |
7f502361 ED |
1770 | struct dst_entry *old_dst; |
1771 | ||
1772 | sk_tx_queue_clear(sk); | |
5925a055 | 1773 | old_dst = xchg((__force struct dst_entry **)&sk->sk_dst_cache, dst); |
7f502361 | 1774 | dst_release(old_dst); |
1da177e4 LT |
1775 | } |
1776 | ||
1777 | static inline void | |
1778 | __sk_dst_reset(struct sock *sk) | |
1779 | { | |
b6c6712a | 1780 | __sk_dst_set(sk, NULL); |
1da177e4 LT |
1781 | } |
1782 | ||
1783 | static inline void | |
1784 | sk_dst_reset(struct sock *sk) | |
1785 | { | |
7f502361 | 1786 | sk_dst_set(sk, NULL); |
1da177e4 LT |
1787 | } |
1788 | ||
69336bd2 | 1789 | struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie); |
1da177e4 | 1790 | |
69336bd2 | 1791 | struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie); |
1da177e4 | 1792 | |
f60e5990 | 1793 | bool sk_mc_loop(struct sock *sk); |
1794 | ||
dc6b9b78 | 1795 | static inline bool sk_can_gso(const struct sock *sk) |
bcd76111 HX |
1796 | { |
1797 | return net_gso_ok(sk->sk_route_caps, sk->sk_gso_type); | |
1798 | } | |
1799 | ||
69336bd2 | 1800 | void sk_setup_caps(struct sock *sk, struct dst_entry *dst); |
6cbb0df7 | 1801 | |
c8f44aff | 1802 | static inline void sk_nocaps_add(struct sock *sk, netdev_features_t flags) |
a465419b ED |
1803 | { |
1804 | sk->sk_route_nocaps |= flags; | |
1805 | sk->sk_route_caps &= ~flags; | |
1806 | } | |
1807 | ||
9a49850d TH |
1808 | static inline bool sk_check_csum_caps(struct sock *sk) |
1809 | { | |
1810 | return (sk->sk_route_caps & NETIF_F_HW_CSUM) || | |
1811 | (sk->sk_family == PF_INET && | |
1812 | (sk->sk_route_caps & NETIF_F_IP_CSUM)) || | |
1813 | (sk->sk_family == PF_INET6 && | |
1814 | (sk->sk_route_caps & NETIF_F_IPV6_CSUM)); | |
1815 | } | |
1816 | ||
c6e1a0d1 | 1817 | static inline int skb_do_copy_data_nocache(struct sock *sk, struct sk_buff *skb, |
57be5bda | 1818 | struct iov_iter *from, char *to, |
912d398d | 1819 | int copy, int offset) |
c6e1a0d1 TH |
1820 | { |
1821 | if (skb->ip_summed == CHECKSUM_NONE) { | |
57be5bda AV |
1822 | __wsum csum = 0; |
1823 | if (csum_and_copy_from_iter(to, copy, &csum, from) != copy) | |
1824 | return -EFAULT; | |
912d398d | 1825 | skb->csum = csum_block_add(skb->csum, csum, offset); |
c6e1a0d1 | 1826 | } else if (sk->sk_route_caps & NETIF_F_NOCACHE_COPY) { |
57be5bda | 1827 | if (copy_from_iter_nocache(to, copy, from) != copy) |
c6e1a0d1 | 1828 | return -EFAULT; |
57be5bda | 1829 | } else if (copy_from_iter(to, copy, from) != copy) |
c6e1a0d1 TH |
1830 | return -EFAULT; |
1831 | ||
1832 | return 0; | |
1833 | } | |
1834 | ||
1835 | static inline int skb_add_data_nocache(struct sock *sk, struct sk_buff *skb, | |
57be5bda | 1836 | struct iov_iter *from, int copy) |
c6e1a0d1 | 1837 | { |
912d398d | 1838 | int err, offset = skb->len; |
c6e1a0d1 | 1839 | |
912d398d WY |
1840 | err = skb_do_copy_data_nocache(sk, skb, from, skb_put(skb, copy), |
1841 | copy, offset); | |
c6e1a0d1 | 1842 | if (err) |
912d398d | 1843 | __skb_trim(skb, offset); |
c6e1a0d1 TH |
1844 | |
1845 | return err; | |
1846 | } | |
1847 | ||
57be5bda | 1848 | static inline int skb_copy_to_page_nocache(struct sock *sk, struct iov_iter *from, |
c6e1a0d1 TH |
1849 | struct sk_buff *skb, |
1850 | struct page *page, | |
1851 | int off, int copy) | |
1852 | { | |
1853 | int err; | |
1854 | ||
912d398d WY |
1855 | err = skb_do_copy_data_nocache(sk, skb, from, page_address(page) + off, |
1856 | copy, skb->len); | |
c6e1a0d1 TH |
1857 | if (err) |
1858 | return err; | |
1859 | ||
1860 | skb->len += copy; | |
1861 | skb->data_len += copy; | |
1862 | skb->truesize += copy; | |
1863 | sk->sk_wmem_queued += copy; | |
1864 | sk_mem_charge(sk, copy); | |
1865 | return 0; | |
1866 | } | |
1867 | ||
c564039f ED |
1868 | /** |
1869 | * sk_wmem_alloc_get - returns write allocations | |
1870 | * @sk: socket | |
1871 | * | |
1872 | * Returns sk_wmem_alloc minus initial offset of one | |
1873 | */ | |
1874 | static inline int sk_wmem_alloc_get(const struct sock *sk) | |
1875 | { | |
1876 | return atomic_read(&sk->sk_wmem_alloc) - 1; | |
1877 | } | |
1878 | ||
1879 | /** | |
1880 | * sk_rmem_alloc_get - returns read allocations | |
1881 | * @sk: socket | |
1882 | * | |
1883 | * Returns sk_rmem_alloc | |
1884 | */ | |
1885 | static inline int sk_rmem_alloc_get(const struct sock *sk) | |
1886 | { | |
1887 | return atomic_read(&sk->sk_rmem_alloc); | |
1888 | } | |
1889 | ||
1890 | /** | |
1891 | * sk_has_allocations - check if allocations are outstanding | |
1892 | * @sk: socket | |
1893 | * | |
1894 | * Returns true if socket has write or read allocations | |
1895 | */ | |
dc6b9b78 | 1896 | static inline bool sk_has_allocations(const struct sock *sk) |
c564039f ED |
1897 | { |
1898 | return sk_wmem_alloc_get(sk) || sk_rmem_alloc_get(sk); | |
1899 | } | |
1900 | ||
a57de0b4 | 1901 | /** |
1ce0bf50 | 1902 | * skwq_has_sleeper - check if there are any waiting processes |
acfbe96a | 1903 | * @wq: struct socket_wq |
a57de0b4 | 1904 | * |
43815482 | 1905 | * Returns true if socket_wq has waiting processes |
a57de0b4 | 1906 | * |
1ce0bf50 | 1907 | * The purpose of the skwq_has_sleeper and sock_poll_wait is to wrap the memory |
a57de0b4 JO |
1908 | * barrier call. They were added due to the race found within the tcp code. |
1909 | * | |
1910 | * Consider following tcp code paths: | |
1911 | * | |
1912 | * CPU1 CPU2 | |
1913 | * | |
1914 | * sys_select receive packet | |
1915 | * ... ... | |
1916 | * __add_wait_queue update tp->rcv_nxt | |
1917 | * ... ... | |
1918 | * tp->rcv_nxt check sock_def_readable | |
1919 | * ... { | |
43815482 ED |
1920 | * schedule rcu_read_lock(); |
1921 | * wq = rcu_dereference(sk->sk_wq); | |
1922 | * if (wq && waitqueue_active(&wq->wait)) | |
1923 | * wake_up_interruptible(&wq->wait) | |
a57de0b4 JO |
1924 | * ... |
1925 | * } | |
1926 | * | |
1927 | * The race for tcp fires when the __add_wait_queue changes done by CPU1 stay | |
1928 | * in its cache, and so does the tp->rcv_nxt update on CPU2 side. The CPU1 | |
1929 | * could then endup calling schedule and sleep forever if there are no more | |
1930 | * data on the socket. | |
ad462769 | 1931 | * |
a57de0b4 | 1932 | */ |
1ce0bf50 | 1933 | static inline bool skwq_has_sleeper(struct socket_wq *wq) |
a57de0b4 | 1934 | { |
1ce0bf50 | 1935 | return wq && wq_has_sleeper(&wq->wait); |
a57de0b4 JO |
1936 | } |
1937 | ||
1938 | /** | |
1939 | * sock_poll_wait - place memory barrier behind the poll_wait call. | |
1940 | * @filp: file | |
1941 | * @wait_address: socket wait queue | |
1942 | * @p: poll_table | |
1943 | * | |
43815482 | 1944 | * See the comments in the wq_has_sleeper function. |
a57de0b4 JO |
1945 | */ |
1946 | static inline void sock_poll_wait(struct file *filp, | |
1947 | wait_queue_head_t *wait_address, poll_table *p) | |
1948 | { | |
626cf236 | 1949 | if (!poll_does_not_wait(p) && wait_address) { |
a57de0b4 | 1950 | poll_wait(filp, wait_address, p); |
dc6b9b78 | 1951 | /* We need to be sure we are in sync with the |
a57de0b4 JO |
1952 | * socket flags modification. |
1953 | * | |
43815482 | 1954 | * This memory barrier is paired in the wq_has_sleeper. |
dc6b9b78 | 1955 | */ |
a57de0b4 JO |
1956 | smp_mb(); |
1957 | } | |
1958 | } | |
1959 | ||
b73c3d0e TH |
1960 | static inline void skb_set_hash_from_sk(struct sk_buff *skb, struct sock *sk) |
1961 | { | |
1962 | if (sk->sk_txhash) { | |
1963 | skb->l4_hash = 1; | |
1964 | skb->hash = sk->sk_txhash; | |
1965 | } | |
1966 | } | |
1967 | ||
9e17f8a4 ED |
1968 | void skb_set_owner_w(struct sk_buff *skb, struct sock *sk); |
1969 | ||
1da177e4 | 1970 | /* |
dc6b9b78 | 1971 | * Queue a received datagram if it will fit. Stream and sequenced |
1da177e4 LT |
1972 | * protocols can't normally use this as they need to fit buffers in |
1973 | * and play with them. | |
1974 | * | |
dc6b9b78 | 1975 | * Inlined as it's very short and called for pretty much every |
1da177e4 LT |
1976 | * packet ever received. |
1977 | */ | |
1da177e4 LT |
1978 | static inline void skb_set_owner_r(struct sk_buff *skb, struct sock *sk) |
1979 | { | |
d55d87fd | 1980 | skb_orphan(skb); |
1da177e4 LT |
1981 | skb->sk = sk; |
1982 | skb->destructor = sock_rfree; | |
1983 | atomic_add(skb->truesize, &sk->sk_rmem_alloc); | |
3ab224be | 1984 | sk_mem_charge(sk, skb->truesize); |
1da177e4 LT |
1985 | } |
1986 | ||
69336bd2 JP |
1987 | void sk_reset_timer(struct sock *sk, struct timer_list *timer, |
1988 | unsigned long expires); | |
1da177e4 | 1989 | |
69336bd2 | 1990 | void sk_stop_timer(struct sock *sk, struct timer_list *timer); |
1da177e4 | 1991 | |
f8c3bf00 PA |
1992 | int __sk_queue_drop_skb(struct sock *sk, struct sk_buff *skb, |
1993 | unsigned int flags); | |
e6afc8ac | 1994 | int __sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb); |
69336bd2 | 1995 | int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb); |
1da177e4 | 1996 | |
69336bd2 | 1997 | int sock_queue_err_skb(struct sock *sk, struct sk_buff *skb); |
364a9e93 | 1998 | struct sk_buff *sock_dequeue_err_skb(struct sock *sk); |
1da177e4 LT |
1999 | |
2000 | /* | |
2001 | * Recover an error report and clear atomically | |
2002 | */ | |
dc6b9b78 | 2003 | |
1da177e4 LT |
2004 | static inline int sock_error(struct sock *sk) |
2005 | { | |
c1cbe4b7 BL |
2006 | int err; |
2007 | if (likely(!sk->sk_err)) | |
2008 | return 0; | |
2009 | err = xchg(&sk->sk_err, 0); | |
1da177e4 LT |
2010 | return -err; |
2011 | } | |
2012 | ||
2013 | static inline unsigned long sock_wspace(struct sock *sk) | |
2014 | { | |
2015 | int amt = 0; | |
2016 | ||
2017 | if (!(sk->sk_shutdown & SEND_SHUTDOWN)) { | |
2018 | amt = sk->sk_sndbuf - atomic_read(&sk->sk_wmem_alloc); | |
dc6b9b78 | 2019 | if (amt < 0) |
1da177e4 LT |
2020 | amt = 0; |
2021 | } | |
2022 | return amt; | |
2023 | } | |
2024 | ||
ceb5d58b ED |
2025 | /* Note: |
2026 | * We use sk->sk_wq_raw, from contexts knowing this | |
2027 | * pointer is not NULL and cannot disappear/change. | |
2028 | */ | |
9cd3e072 | 2029 | static inline void sk_set_bit(int nr, struct sock *sk) |
1da177e4 | 2030 | { |
4be73522 ED |
2031 | if ((nr == SOCKWQ_ASYNC_NOSPACE || nr == SOCKWQ_ASYNC_WAITDATA) && |
2032 | !sock_flag(sk, SOCK_FASYNC)) | |
9317bb69 ED |
2033 | return; |
2034 | ||
ceb5d58b | 2035 | set_bit(nr, &sk->sk_wq_raw->flags); |
9cd3e072 ED |
2036 | } |
2037 | ||
2038 | static inline void sk_clear_bit(int nr, struct sock *sk) | |
2039 | { | |
4be73522 ED |
2040 | if ((nr == SOCKWQ_ASYNC_NOSPACE || nr == SOCKWQ_ASYNC_WAITDATA) && |
2041 | !sock_flag(sk, SOCK_FASYNC)) | |
9317bb69 ED |
2042 | return; |
2043 | ||
ceb5d58b | 2044 | clear_bit(nr, &sk->sk_wq_raw->flags); |
9cd3e072 ED |
2045 | } |
2046 | ||
ceb5d58b | 2047 | static inline void sk_wake_async(const struct sock *sk, int how, int band) |
1da177e4 | 2048 | { |
ceb5d58b ED |
2049 | if (sock_flag(sk, SOCK_FASYNC)) { |
2050 | rcu_read_lock(); | |
2051 | sock_wake_async(rcu_dereference(sk->sk_wq), how, band); | |
2052 | rcu_read_unlock(); | |
2053 | } | |
1da177e4 LT |
2054 | } |
2055 | ||
eea86af6 DB |
2056 | /* Since sk_{r,w}mem_alloc sums skb->truesize, even a small frame might |
2057 | * need sizeof(sk_buff) + MTU + padding, unless net driver perform copybreak. | |
2058 | * Note: for send buffers, TCP works better if we can build two skbs at | |
2059 | * minimum. | |
7a91b434 | 2060 | */ |
9eb5bf83 | 2061 | #define TCP_SKB_MIN_TRUESIZE (2048 + SKB_DATA_ALIGN(sizeof(struct sk_buff))) |
eea86af6 DB |
2062 | |
2063 | #define SOCK_MIN_SNDBUF (TCP_SKB_MIN_TRUESIZE * 2) | |
2064 | #define SOCK_MIN_RCVBUF TCP_SKB_MIN_TRUESIZE | |
1da177e4 LT |
2065 | |
2066 | static inline void sk_stream_moderate_sndbuf(struct sock *sk) | |
2067 | { | |
2068 | if (!(sk->sk_userlocks & SOCK_SNDBUF_LOCK)) { | |
8df09ea3 | 2069 | sk->sk_sndbuf = min(sk->sk_sndbuf, sk->sk_wmem_queued >> 1); |
eea86af6 | 2070 | sk->sk_sndbuf = max_t(u32, sk->sk_sndbuf, SOCK_MIN_SNDBUF); |
1da177e4 LT |
2071 | } |
2072 | } | |
2073 | ||
eb934478 ED |
2074 | struct sk_buff *sk_stream_alloc_skb(struct sock *sk, int size, gfp_t gfp, |
2075 | bool force_schedule); | |
1da177e4 | 2076 | |
5640f768 ED |
2077 | /** |
2078 | * sk_page_frag - return an appropriate page_frag | |
2079 | * @sk: socket | |
2080 | * | |
2081 | * If socket allocation mode allows current thread to sleep, it means its | |
2082 | * safe to use the per task page_frag instead of the per socket one. | |
2083 | */ | |
2084 | static inline struct page_frag *sk_page_frag(struct sock *sk) | |
1da177e4 | 2085 | { |
d0164adc | 2086 | if (gfpflags_allow_blocking(sk->sk_allocation)) |
5640f768 | 2087 | return ¤t->task_frag; |
1da177e4 | 2088 | |
5640f768 | 2089 | return &sk->sk_frag; |
1da177e4 LT |
2090 | } |
2091 | ||
69336bd2 | 2092 | bool sk_page_frag_refill(struct sock *sk, struct page_frag *pfrag); |
5640f768 | 2093 | |
1da177e4 LT |
2094 | /* |
2095 | * Default write policy as shown to user space via poll/select/SIGIO | |
2096 | */ | |
dc6b9b78 | 2097 | static inline bool sock_writeable(const struct sock *sk) |
1da177e4 | 2098 | { |
8df09ea3 | 2099 | return atomic_read(&sk->sk_wmem_alloc) < (sk->sk_sndbuf >> 1); |
1da177e4 LT |
2100 | } |
2101 | ||
dd0fc66f | 2102 | static inline gfp_t gfp_any(void) |
1da177e4 | 2103 | { |
99709372 | 2104 | return in_softirq() ? GFP_ATOMIC : GFP_KERNEL; |
1da177e4 LT |
2105 | } |
2106 | ||
dc6b9b78 | 2107 | static inline long sock_rcvtimeo(const struct sock *sk, bool noblock) |
1da177e4 LT |
2108 | { |
2109 | return noblock ? 0 : sk->sk_rcvtimeo; | |
2110 | } | |
2111 | ||
dc6b9b78 | 2112 | static inline long sock_sndtimeo(const struct sock *sk, bool noblock) |
1da177e4 LT |
2113 | { |
2114 | return noblock ? 0 : sk->sk_sndtimeo; | |
2115 | } | |
2116 | ||
2117 | static inline int sock_rcvlowat(const struct sock *sk, int waitall, int len) | |
2118 | { | |
2119 | return (waitall ? len : min_t(int, sk->sk_rcvlowat, len)) ? : 1; | |
2120 | } | |
2121 | ||
2122 | /* Alas, with timeout socket operations are not restartable. | |
2123 | * Compare this to poll(). | |
2124 | */ | |
2125 | static inline int sock_intr_errno(long timeo) | |
2126 | { | |
2127 | return timeo == MAX_SCHEDULE_TIMEOUT ? -ERESTARTSYS : -EINTR; | |
2128 | } | |
2129 | ||
744d5a3e EB |
2130 | struct sock_skb_cb { |
2131 | u32 dropcount; | |
2132 | }; | |
2133 | ||
2134 | /* Store sock_skb_cb at the end of skb->cb[] so protocol families | |
2135 | * using skb->cb[] would keep using it directly and utilize its | |
2136 | * alignement guarantee. | |
2137 | */ | |
2138 | #define SOCK_SKB_CB_OFFSET ((FIELD_SIZEOF(struct sk_buff, cb) - \ | |
2139 | sizeof(struct sock_skb_cb))) | |
2140 | ||
2141 | #define SOCK_SKB_CB(__skb) ((struct sock_skb_cb *)((__skb)->cb + \ | |
2142 | SOCK_SKB_CB_OFFSET)) | |
2143 | ||
b4772ef8 | 2144 | #define sock_skb_cb_check_size(size) \ |
744d5a3e | 2145 | BUILD_BUG_ON((size) > SOCK_SKB_CB_OFFSET) |
b4772ef8 | 2146 | |
3bc3b96f EB |
2147 | static inline void |
2148 | sock_skb_set_dropcount(const struct sock *sk, struct sk_buff *skb) | |
2149 | { | |
744d5a3e | 2150 | SOCK_SKB_CB(skb)->dropcount = atomic_read(&sk->sk_drops); |
3bc3b96f EB |
2151 | } |
2152 | ||
532182cd ED |
2153 | static inline void sk_drops_add(struct sock *sk, const struct sk_buff *skb) |
2154 | { | |
2155 | int segs = max_t(u16, 1, skb_shinfo(skb)->gso_segs); | |
2156 | ||
2157 | atomic_add(segs, &sk->sk_drops); | |
2158 | } | |
2159 | ||
69336bd2 JP |
2160 | void __sock_recv_timestamp(struct msghdr *msg, struct sock *sk, |
2161 | struct sk_buff *skb); | |
2162 | void __sock_recv_wifi_status(struct msghdr *msg, struct sock *sk, | |
2163 | struct sk_buff *skb); | |
92f37fd2 | 2164 | |
dc6b9b78 | 2165 | static inline void |
1da177e4 LT |
2166 | sock_recv_timestamp(struct msghdr *msg, struct sock *sk, struct sk_buff *skb) |
2167 | { | |
b7aa0bf7 | 2168 | ktime_t kt = skb->tstamp; |
20d49473 | 2169 | struct skb_shared_hwtstamps *hwtstamps = skb_hwtstamps(skb); |
a61bbcf2 | 2170 | |
20d49473 PO |
2171 | /* |
2172 | * generate control messages if | |
b9f40e21 | 2173 | * - receive time stamping in software requested |
20d49473 | 2174 | * - software time stamp available and wanted |
20d49473 | 2175 | * - hardware time stamps available and wanted |
20d49473 PO |
2176 | */ |
2177 | if (sock_flag(sk, SOCK_RCVTSTAMP) || | |
b9f40e21 | 2178 | (sk->sk_tsflags & SOF_TIMESTAMPING_RX_SOFTWARE) || |
c199105d | 2179 | (kt.tv64 && sk->sk_tsflags & SOF_TIMESTAMPING_SOFTWARE) || |
20d49473 | 2180 | (hwtstamps->hwtstamp.tv64 && |
b9f40e21 | 2181 | (sk->sk_tsflags & SOF_TIMESTAMPING_RAW_HARDWARE))) |
92f37fd2 ED |
2182 | __sock_recv_timestamp(msg, sk, skb); |
2183 | else | |
b7aa0bf7 | 2184 | sk->sk_stamp = kt; |
6e3e939f JB |
2185 | |
2186 | if (sock_flag(sk, SOCK_WIFI_STATUS) && skb->wifi_acked_valid) | |
2187 | __sock_recv_wifi_status(msg, sk, skb); | |
1da177e4 LT |
2188 | } |
2189 | ||
69336bd2 JP |
2190 | void __sock_recv_ts_and_drops(struct msghdr *msg, struct sock *sk, |
2191 | struct sk_buff *skb); | |
767dd033 ED |
2192 | |
2193 | static inline void sock_recv_ts_and_drops(struct msghdr *msg, struct sock *sk, | |
2194 | struct sk_buff *skb) | |
2195 | { | |
2196 | #define FLAGS_TS_OR_DROPS ((1UL << SOCK_RXQ_OVFL) | \ | |
b9f40e21 WB |
2197 | (1UL << SOCK_RCVTSTAMP)) |
2198 | #define TSFLAGS_ANY (SOF_TIMESTAMPING_SOFTWARE | \ | |
2199 | SOF_TIMESTAMPING_RAW_HARDWARE) | |
767dd033 | 2200 | |
b9f40e21 | 2201 | if (sk->sk_flags & FLAGS_TS_OR_DROPS || sk->sk_tsflags & TSFLAGS_ANY) |
767dd033 ED |
2202 | __sock_recv_ts_and_drops(msg, sk, skb); |
2203 | else | |
2204 | sk->sk_stamp = skb->tstamp; | |
2205 | } | |
3b885787 | 2206 | |
c14ac945 | 2207 | void __sock_tx_timestamp(__u16 tsflags, __u8 *tx_flags); |
67cc0d40 | 2208 | |
20d49473 PO |
2209 | /** |
2210 | * sock_tx_timestamp - checks whether the outgoing packet is to be time stamped | |
20d49473 | 2211 | * @sk: socket sending this packet |
c14ac945 | 2212 | * @tsflags: timestamping flags to use |
140c55d4 ED |
2213 | * @tx_flags: completed with instructions for time stamping |
2214 | * | |
2215 | * Note : callers should take care of initial *tx_flags value (usually 0) | |
20d49473 | 2216 | */ |
c14ac945 SHY |
2217 | static inline void sock_tx_timestamp(const struct sock *sk, __u16 tsflags, |
2218 | __u8 *tx_flags) | |
67cc0d40 | 2219 | { |
c14ac945 SHY |
2220 | if (unlikely(tsflags)) |
2221 | __sock_tx_timestamp(tsflags, tx_flags); | |
67cc0d40 WB |
2222 | if (unlikely(sock_flag(sk, SOCK_WIFI_STATUS))) |
2223 | *tx_flags |= SKBTX_WIFI_STATUS; | |
2224 | } | |
20d49473 | 2225 | |
1da177e4 LT |
2226 | /** |
2227 | * sk_eat_skb - Release a skb if it is no longer needed | |
4dc3b16b PP |
2228 | * @sk: socket to eat this skb from |
2229 | * @skb: socket buffer to eat | |
1da177e4 LT |
2230 | * |
2231 | * This routine must be called with interrupts disabled or with the socket | |
2232 | * locked so that the sk_buff queue operation is ok. | |
2233 | */ | |
7bced397 | 2234 | static inline void sk_eat_skb(struct sock *sk, struct sk_buff *skb) |
1da177e4 LT |
2235 | { |
2236 | __skb_unlink(skb, &sk->sk_receive_queue); | |
2237 | __kfree_skb(skb); | |
2238 | } | |
2239 | ||
3b1e0a65 YH |
2240 | static inline |
2241 | struct net *sock_net(const struct sock *sk) | |
2242 | { | |
c2d9ba9b | 2243 | return read_pnet(&sk->sk_net); |
3b1e0a65 YH |
2244 | } |
2245 | ||
2246 | static inline | |
f5aa23fd | 2247 | void sock_net_set(struct sock *sk, struct net *net) |
3b1e0a65 | 2248 | { |
c2d9ba9b | 2249 | write_pnet(&sk->sk_net, net); |
3b1e0a65 YH |
2250 | } |
2251 | ||
23542618 KK |
2252 | static inline struct sock *skb_steal_sock(struct sk_buff *skb) |
2253 | { | |
efc27f8c | 2254 | if (skb->sk) { |
23542618 KK |
2255 | struct sock *sk = skb->sk; |
2256 | ||
2257 | skb->destructor = NULL; | |
2258 | skb->sk = NULL; | |
2259 | return sk; | |
2260 | } | |
2261 | return NULL; | |
2262 | } | |
2263 | ||
1d0ab253 ED |
2264 | /* This helper checks if a socket is a full socket, |
2265 | * ie _not_ a timewait or request socket. | |
2266 | */ | |
2267 | static inline bool sk_fullsock(const struct sock *sk) | |
2268 | { | |
2269 | return (1 << sk->sk_state) & ~(TCPF_TIME_WAIT | TCPF_NEW_SYN_RECV); | |
2270 | } | |
2271 | ||
e446f9df ED |
2272 | /* This helper checks if a socket is a LISTEN or NEW_SYN_RECV |
2273 | * SYNACK messages can be attached to either ones (depending on SYNCOOKIE) | |
2274 | */ | |
2275 | static inline bool sk_listener(const struct sock *sk) | |
2276 | { | |
2277 | return (1 << sk->sk_state) & (TCPF_LISTEN | TCPF_NEW_SYN_RECV); | |
2278 | } | |
2279 | ||
00fd38d9 ED |
2280 | /** |
2281 | * sk_state_load - read sk->sk_state for lockless contexts | |
2282 | * @sk: socket pointer | |
2283 | * | |
2284 | * Paired with sk_state_store(). Used in places we do not hold socket lock : | |
2285 | * tcp_diag_get_info(), tcp_get_info(), tcp_poll(), get_tcp4_sock() ... | |
2286 | */ | |
2287 | static inline int sk_state_load(const struct sock *sk) | |
2288 | { | |
2289 | return smp_load_acquire(&sk->sk_state); | |
2290 | } | |
2291 | ||
2292 | /** | |
2293 | * sk_state_store - update sk->sk_state | |
2294 | * @sk: socket pointer | |
2295 | * @newstate: new state | |
2296 | * | |
2297 | * Paired with sk_state_load(). Should be used in contexts where | |
2298 | * state change might impact lockless readers. | |
2299 | */ | |
2300 | static inline void sk_state_store(struct sock *sk, int newstate) | |
2301 | { | |
2302 | smp_store_release(&sk->sk_state, newstate); | |
2303 | } | |
2304 | ||
69336bd2 JP |
2305 | void sock_enable_timestamp(struct sock *sk, int flag); |
2306 | int sock_get_timestamp(struct sock *, struct timeval __user *); | |
2307 | int sock_get_timestampns(struct sock *, struct timespec __user *); | |
2308 | int sock_recv_errqueue(struct sock *sk, struct msghdr *msg, int len, int level, | |
2309 | int type); | |
1da177e4 | 2310 | |
a3b299da EB |
2311 | bool sk_ns_capable(const struct sock *sk, |
2312 | struct user_namespace *user_ns, int cap); | |
2313 | bool sk_capable(const struct sock *sk, int cap); | |
2314 | bool sk_net_capable(const struct sock *sk, int cap); | |
2315 | ||
1da177e4 LT |
2316 | extern __u32 sysctl_wmem_max; |
2317 | extern __u32 sysctl_rmem_max; | |
2318 | ||
b245be1f | 2319 | extern int sysctl_tstamp_allow_data; |
6baf1f41 DM |
2320 | extern int sysctl_optmem_max; |
2321 | ||
20380731 ACM |
2322 | extern __u32 sysctl_wmem_default; |
2323 | extern __u32 sysctl_rmem_default; | |
20380731 | 2324 | |
1da177e4 | 2325 | #endif /* _SOCK_H */ |