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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> |
75c119af | 63 | #include <linux/rbtree.h> |
1da177e4 | 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> |
41c6d650 | 69 | #include <linux/refcount.h> |
1da177e4 LT |
70 | #include <net/dst.h> |
71 | #include <net/checksum.h> | |
1d0ab253 | 72 | #include <net/tcp_states.h> |
b9f40e21 | 73 | #include <linux/net_tstamp.h> |
f16a7dd5 | 74 | #include <net/smc.h> |
54dc3e33 | 75 | #include <net/l3mdev.h> |
1da177e4 LT |
76 | |
77 | /* | |
78 | * This structure really needs to be cleaned up. | |
79 | * Most of it is for TCP, and not used by any of | |
80 | * the other protocols. | |
81 | */ | |
82 | ||
83 | /* Define this to get the SOCK_DBG debugging facility. */ | |
84 | #define SOCK_DEBUGGING | |
85 | #ifdef SOCK_DEBUGGING | |
86 | #define SOCK_DEBUG(sk, msg...) do { if ((sk) && sock_flag((sk), SOCK_DBG)) \ | |
87 | printk(KERN_DEBUG msg); } while (0) | |
88 | #else | |
4cd9029d | 89 | /* Validate arguments and do nothing */ |
b9075fa9 | 90 | static inline __printf(2, 3) |
dc6b9b78 | 91 | void SOCK_DEBUG(const struct sock *sk, const char *msg, ...) |
4cd9029d SH |
92 | { |
93 | } | |
1da177e4 LT |
94 | #endif |
95 | ||
96 | /* This is the per-socket lock. The spinlock provides a synchronization | |
97 | * between user contexts and software interrupt processing, whereas the | |
98 | * mini-semaphore synchronizes multiple users amongst themselves. | |
99 | */ | |
1da177e4 LT |
100 | typedef struct { |
101 | spinlock_t slock; | |
d2e9117c | 102 | int owned; |
1da177e4 | 103 | wait_queue_head_t wq; |
a5b5bb9a IM |
104 | /* |
105 | * We express the mutex-alike socket_lock semantics | |
106 | * to the lock validator by explicitly managing | |
107 | * the slock as a lock variant (in addition to | |
108 | * the slock itself): | |
109 | */ | |
110 | #ifdef CONFIG_DEBUG_LOCK_ALLOC | |
111 | struct lockdep_map dep_map; | |
112 | #endif | |
1da177e4 LT |
113 | } socket_lock_t; |
114 | ||
1da177e4 | 115 | struct sock; |
8feaf0c0 | 116 | struct proto; |
0eeb8ffc | 117 | struct net; |
1da177e4 | 118 | |
077b393d ED |
119 | typedef __u32 __bitwise __portpair; |
120 | typedef __u64 __bitwise __addrpair; | |
121 | ||
1da177e4 | 122 | /** |
4dc3b16b | 123 | * struct sock_common - minimal network layer representation of sockets |
68835aba ED |
124 | * @skc_daddr: Foreign IPv4 addr |
125 | * @skc_rcv_saddr: Bound local IPv4 addr | |
4dc6dc71 | 126 | * @skc_hash: hash value used with various protocol lookup tables |
d4cada4a | 127 | * @skc_u16hashes: two u16 hash values used by UDP lookup tables |
ce43b03e ED |
128 | * @skc_dport: placeholder for inet_dport/tw_dport |
129 | * @skc_num: placeholder for inet_num/tw_num | |
4dc3b16b PP |
130 | * @skc_family: network address family |
131 | * @skc_state: Connection state | |
132 | * @skc_reuse: %SO_REUSEADDR setting | |
055dc21a | 133 | * @skc_reuseport: %SO_REUSEPORT setting |
4dc3b16b | 134 | * @skc_bound_dev_if: bound device index if != 0 |
4dc3b16b | 135 | * @skc_bind_node: bind hash linkage for various protocol lookup tables |
512615b6 | 136 | * @skc_portaddr_node: second hash linkage for UDP/UDP-Lite protocol |
8feaf0c0 | 137 | * @skc_prot: protocol handlers inside a network family |
07feaebf | 138 | * @skc_net: reference to the network namespace of this socket |
68835aba ED |
139 | * @skc_node: main hash linkage for various protocol lookup tables |
140 | * @skc_nulls_node: main hash linkage for TCP/UDP/UDP-Lite protocol | |
141 | * @skc_tx_queue_mapping: tx queue number for this connection | |
c6345ce7 | 142 | * @skc_rx_queue_mapping: rx queue number for this connection |
8e5eb54d ED |
143 | * @skc_flags: place holder for sk_flags |
144 | * %SO_LINGER (l_onoff), %SO_BROADCAST, %SO_KEEPALIVE, | |
145 | * %SO_OOBINLINE settings, %SO_TIMESTAMPING settings | |
70da268b | 146 | * @skc_incoming_cpu: record/match cpu processing incoming packets |
68835aba | 147 | * @skc_refcnt: reference count |
4dc3b16b PP |
148 | * |
149 | * This is the minimal network layer representation of sockets, the header | |
8feaf0c0 ACM |
150 | * for struct sock and struct inet_timewait_sock. |
151 | */ | |
1da177e4 | 152 | struct sock_common { |
ce43b03e | 153 | /* skc_daddr and skc_rcv_saddr must be grouped on a 8 bytes aligned |
05dbc7b5 | 154 | * address on 64bit arches : cf INET_MATCH() |
4dc6dc71 | 155 | */ |
ce43b03e | 156 | union { |
077b393d | 157 | __addrpair skc_addrpair; |
ce43b03e ED |
158 | struct { |
159 | __be32 skc_daddr; | |
160 | __be32 skc_rcv_saddr; | |
161 | }; | |
162 | }; | |
d4cada4a ED |
163 | union { |
164 | unsigned int skc_hash; | |
165 | __u16 skc_u16hashes[2]; | |
166 | }; | |
ce43b03e ED |
167 | /* skc_dport && skc_num must be grouped as well */ |
168 | union { | |
077b393d | 169 | __portpair skc_portpair; |
ce43b03e ED |
170 | struct { |
171 | __be16 skc_dport; | |
172 | __u16 skc_num; | |
173 | }; | |
174 | }; | |
175 | ||
4dc6dc71 ED |
176 | unsigned short skc_family; |
177 | volatile unsigned char skc_state; | |
055dc21a | 178 | unsigned char skc_reuse:4; |
9fe516ba ED |
179 | unsigned char skc_reuseport:1; |
180 | unsigned char skc_ipv6only:1; | |
26abe143 | 181 | unsigned char skc_net_refcnt:1; |
4dc6dc71 | 182 | int skc_bound_dev_if; |
512615b6 ED |
183 | union { |
184 | struct hlist_node skc_bind_node; | |
ca065d0c | 185 | struct hlist_node skc_portaddr_node; |
512615b6 | 186 | }; |
8feaf0c0 | 187 | struct proto *skc_prot; |
0c5c9fb5 | 188 | possible_net_t skc_net; |
efe4208f ED |
189 | |
190 | #if IS_ENABLED(CONFIG_IPV6) | |
191 | struct in6_addr skc_v6_daddr; | |
192 | struct in6_addr skc_v6_rcv_saddr; | |
193 | #endif | |
194 | ||
33cf7c90 ED |
195 | atomic64_t skc_cookie; |
196 | ||
8e5eb54d ED |
197 | /* following fields are padding to force |
198 | * offset(struct sock, sk_refcnt) == 128 on 64bit arches | |
199 | * assuming IPV6 is enabled. We use this padding differently | |
200 | * for different kind of 'sockets' | |
201 | */ | |
202 | union { | |
203 | unsigned long skc_flags; | |
204 | struct sock *skc_listener; /* request_sock */ | |
205 | struct inet_timewait_death_row *skc_tw_dr; /* inet_timewait_sock */ | |
206 | }; | |
68835aba ED |
207 | /* |
208 | * fields between dontcopy_begin/dontcopy_end | |
209 | * are not copied in sock_copy() | |
210 | */ | |
928c41e7 | 211 | /* private: */ |
68835aba | 212 | int skc_dontcopy_begin[0]; |
928c41e7 | 213 | /* public: */ |
68835aba ED |
214 | union { |
215 | struct hlist_node skc_node; | |
216 | struct hlist_nulls_node skc_nulls_node; | |
217 | }; | |
755c31cd | 218 | unsigned short skc_tx_queue_mapping; |
c6345ce7 AN |
219 | #ifdef CONFIG_XPS |
220 | unsigned short skc_rx_queue_mapping; | |
221 | #endif | |
ed53d0ab ED |
222 | union { |
223 | int skc_incoming_cpu; | |
224 | u32 skc_rcv_wnd; | |
d475f090 | 225 | u32 skc_tw_rcv_nxt; /* struct tcp_timewait_sock */ |
ed53d0ab | 226 | }; |
70da268b | 227 | |
41c6d650 | 228 | refcount_t skc_refcnt; |
928c41e7 | 229 | /* private: */ |
68835aba | 230 | int skc_dontcopy_end[0]; |
ed53d0ab ED |
231 | union { |
232 | u32 skc_rxhash; | |
233 | u32 skc_window_clamp; | |
d475f090 | 234 | u32 skc_tw_snd_nxt; /* struct tcp_timewait_sock */ |
ed53d0ab | 235 | }; |
928c41e7 | 236 | /* public: */ |
1da177e4 LT |
237 | }; |
238 | ||
239 | /** | |
240 | * struct sock - network layer representation of sockets | |
8feaf0c0 | 241 | * @__sk_common: shared layout with inet_timewait_sock |
4dc3b16b PP |
242 | * @sk_shutdown: mask of %SEND_SHUTDOWN and/or %RCV_SHUTDOWN |
243 | * @sk_userlocks: %SO_SNDBUF and %SO_RCVBUF settings | |
244 | * @sk_lock: synchronizer | |
cdfbabfb | 245 | * @sk_kern_sock: True if sock is using kernel lock classes |
4dc3b16b | 246 | * @sk_rcvbuf: size of receive buffer in bytes |
43815482 | 247 | * @sk_wq: sock wait queue and async head |
421b3885 | 248 | * @sk_rx_dst: receive input route used by early demux |
4dc3b16b | 249 | * @sk_dst_cache: destination cache |
9b8805a3 | 250 | * @sk_dst_pending_confirm: need to confirm neighbour |
4dc3b16b | 251 | * @sk_policy: flow policy |
4dc3b16b PP |
252 | * @sk_receive_queue: incoming packets |
253 | * @sk_wmem_alloc: transmit queue bytes committed | |
771edcaf | 254 | * @sk_tsq_flags: TCP Small Queues flags |
4dc3b16b PP |
255 | * @sk_write_queue: Packet sending queue |
256 | * @sk_omem_alloc: "o" is "option" or "other" | |
257 | * @sk_wmem_queued: persistent queue size | |
258 | * @sk_forward_alloc: space allocated forward | |
06021292 | 259 | * @sk_napi_id: id of the last napi context to receive data for sk |
dafcc438 | 260 | * @sk_ll_usec: usecs to busypoll when there is no data |
4dc3b16b | 261 | * @sk_allocation: allocation mode |
95bd09eb | 262 | * @sk_pacing_rate: Pacing rate (if supported by transport/packet scheduler) |
218af599 | 263 | * @sk_pacing_status: Pacing status (requested, handled by sch_fq) |
c3f40d7c | 264 | * @sk_max_pacing_rate: Maximum pacing rate (%SO_MAX_PACING_RATE) |
4dc3b16b | 265 | * @sk_sndbuf: size of send buffer in bytes |
771edcaf | 266 | * @__sk_flags_offset: empty field used to determine location of bitfield |
293de7de | 267 | * @sk_padding: unused element for alignment |
28448b80 TH |
268 | * @sk_no_check_tx: %SO_NO_CHECK setting, set checksum in TX packets |
269 | * @sk_no_check_rx: allow zero checksum in RX packets | |
4dc3b16b | 270 | * @sk_route_caps: route capabilities (e.g. %NETIF_F_TSO) |
a465419b | 271 | * @sk_route_nocaps: forbidden route capabilities (e.g NETIF_F_GSO_MASK) |
bcd76111 | 272 | * @sk_gso_type: GSO type (e.g. %SKB_GSO_TCPV4) |
82cc1a7a | 273 | * @sk_gso_max_size: Maximum GSO segment size to build |
1485348d | 274 | * @sk_gso_max_segs: Maximum number of GSO segments |
3a9b76fd | 275 | * @sk_pacing_shift: scaling factor for TCP Small Queues |
4dc3b16b | 276 | * @sk_lingertime: %SO_LINGER l_linger setting |
4dc3b16b PP |
277 | * @sk_backlog: always used with the per-socket spinlock held |
278 | * @sk_callback_lock: used with the callbacks in the end of this struct | |
279 | * @sk_error_queue: rarely used | |
33c732c3 WC |
280 | * @sk_prot_creator: sk_prot of original sock creator (see ipv6_setsockopt, |
281 | * IPV6_ADDRFORM for instance) | |
4dc3b16b | 282 | * @sk_err: last error |
33c732c3 WC |
283 | * @sk_err_soft: errors that don't cause failure but are the cause of a |
284 | * persistent failure not just 'timed out' | |
cb61cb9b | 285 | * @sk_drops: raw/udp drops counter |
4dc3b16b PP |
286 | * @sk_ack_backlog: current listen backlog |
287 | * @sk_max_ack_backlog: listen backlog set in listen() | |
771edcaf | 288 | * @sk_uid: user id of owner |
4dc3b16b PP |
289 | * @sk_priority: %SO_PRIORITY setting |
290 | * @sk_type: socket type (%SOCK_STREAM, etc) | |
291 | * @sk_protocol: which protocol this socket belongs in this network family | |
53c3fa20 RD |
292 | * @sk_peer_pid: &struct pid for this socket's peer |
293 | * @sk_peer_cred: %SO_PEERCRED setting | |
4dc3b16b PP |
294 | * @sk_rcvlowat: %SO_RCVLOWAT setting |
295 | * @sk_rcvtimeo: %SO_RCVTIMEO setting | |
296 | * @sk_sndtimeo: %SO_SNDTIMEO setting | |
b73c3d0e | 297 | * @sk_txhash: computed flow hash for use on transmit |
4dc3b16b | 298 | * @sk_filter: socket filtering instructions |
4dc3b16b PP |
299 | * @sk_timer: sock cleanup timer |
300 | * @sk_stamp: time stamp of last packet received | |
b9f40e21 | 301 | * @sk_tsflags: SO_TIMESTAMPING socket options |
09c2d251 | 302 | * @sk_tskey: counter to disambiguate concurrent tstamp requests |
52267790 | 303 | * @sk_zckey: counter to order MSG_ZEROCOPY notifications |
4dc3b16b PP |
304 | * @sk_socket: Identd and reporting IO signals |
305 | * @sk_user_data: RPC layer private data | |
5640f768 | 306 | * @sk_frag: cached page frag |
d3d4f0a0 | 307 | * @sk_peek_off: current peek_offset value |
4dc3b16b | 308 | * @sk_send_head: front of stuff to transmit |
67be2dd1 | 309 | * @sk_security: used by security modules |
31729363 | 310 | * @sk_mark: generic packet mark |
2a56a1fe | 311 | * @sk_cgrp_data: cgroup data for this cgroup |
baac50bb | 312 | * @sk_memcg: this socket's memory cgroup association |
4dc3b16b PP |
313 | * @sk_write_pending: a write to stream socket waits to start |
314 | * @sk_state_change: callback to indicate change in the state of the sock | |
315 | * @sk_data_ready: callback to indicate there is data to be processed | |
316 | * @sk_write_space: callback to indicate there is bf sending space available | |
317 | * @sk_error_report: callback to indicate errors (e.g. %MSG_ERRQUEUE) | |
318 | * @sk_backlog_rcv: callback to process the backlog | |
319 | * @sk_destruct: called at sock freeing time, i.e. when all refcnt == 0 | |
ef456144 | 320 | * @sk_reuseport_cb: reuseport group container |
293de7de | 321 | * @sk_rcu: used during RCU grace period |
80b14dee RC |
322 | * @sk_clockid: clockid used by time-based scheduling (SO_TXTIME) |
323 | * @sk_txtime_deadline_mode: set deadline mode for SO_TXTIME | |
324 | * @sk_txtime_unused: unused txtime flags | |
293de7de | 325 | */ |
1da177e4 LT |
326 | struct sock { |
327 | /* | |
8feaf0c0 | 328 | * Now struct inet_timewait_sock also uses sock_common, so please just |
1da177e4 LT |
329 | * don't add nothing before this first member (__sk_common) --acme |
330 | */ | |
331 | struct sock_common __sk_common; | |
4dc6dc71 ED |
332 | #define sk_node __sk_common.skc_node |
333 | #define sk_nulls_node __sk_common.skc_nulls_node | |
334 | #define sk_refcnt __sk_common.skc_refcnt | |
e022f0b4 | 335 | #define sk_tx_queue_mapping __sk_common.skc_tx_queue_mapping |
c6345ce7 AN |
336 | #ifdef CONFIG_XPS |
337 | #define sk_rx_queue_mapping __sk_common.skc_rx_queue_mapping | |
338 | #endif | |
4dc6dc71 | 339 | |
68835aba ED |
340 | #define sk_dontcopy_begin __sk_common.skc_dontcopy_begin |
341 | #define sk_dontcopy_end __sk_common.skc_dontcopy_end | |
4dc6dc71 | 342 | #define sk_hash __sk_common.skc_hash |
50805466 | 343 | #define sk_portpair __sk_common.skc_portpair |
05dbc7b5 ED |
344 | #define sk_num __sk_common.skc_num |
345 | #define sk_dport __sk_common.skc_dport | |
50805466 ED |
346 | #define sk_addrpair __sk_common.skc_addrpair |
347 | #define sk_daddr __sk_common.skc_daddr | |
348 | #define sk_rcv_saddr __sk_common.skc_rcv_saddr | |
1da177e4 LT |
349 | #define sk_family __sk_common.skc_family |
350 | #define sk_state __sk_common.skc_state | |
351 | #define sk_reuse __sk_common.skc_reuse | |
055dc21a | 352 | #define sk_reuseport __sk_common.skc_reuseport |
9fe516ba | 353 | #define sk_ipv6only __sk_common.skc_ipv6only |
26abe143 | 354 | #define sk_net_refcnt __sk_common.skc_net_refcnt |
1da177e4 | 355 | #define sk_bound_dev_if __sk_common.skc_bound_dev_if |
1da177e4 | 356 | #define sk_bind_node __sk_common.skc_bind_node |
8feaf0c0 | 357 | #define sk_prot __sk_common.skc_prot |
07feaebf | 358 | #define sk_net __sk_common.skc_net |
efe4208f ED |
359 | #define sk_v6_daddr __sk_common.skc_v6_daddr |
360 | #define sk_v6_rcv_saddr __sk_common.skc_v6_rcv_saddr | |
33cf7c90 | 361 | #define sk_cookie __sk_common.skc_cookie |
70da268b | 362 | #define sk_incoming_cpu __sk_common.skc_incoming_cpu |
8e5eb54d | 363 | #define sk_flags __sk_common.skc_flags |
ed53d0ab | 364 | #define sk_rxhash __sk_common.skc_rxhash |
efe4208f | 365 | |
1da177e4 | 366 | socket_lock_t sk_lock; |
9115e8cd ED |
367 | atomic_t sk_drops; |
368 | int sk_rcvlowat; | |
369 | struct sk_buff_head sk_error_queue; | |
b178bb3d | 370 | struct sk_buff_head sk_receive_queue; |
fa438ccf ED |
371 | /* |
372 | * The backlog queue is special, it is always used with | |
373 | * the per-socket spinlock held and requires low latency | |
374 | * access. Therefore we special case it's implementation. | |
b178bb3d ED |
375 | * Note : rmem_alloc is in this structure to fill a hole |
376 | * on 64bit arches, not because its logically part of | |
377 | * backlog. | |
fa438ccf ED |
378 | */ |
379 | struct { | |
b178bb3d ED |
380 | atomic_t rmem_alloc; |
381 | int len; | |
382 | struct sk_buff *head; | |
383 | struct sk_buff *tail; | |
fa438ccf | 384 | } sk_backlog; |
b178bb3d | 385 | #define sk_rmem_alloc sk_backlog.rmem_alloc |
2c8c56e1 | 386 | |
9115e8cd | 387 | int sk_forward_alloc; |
e0d1095a | 388 | #ifdef CONFIG_NET_RX_BUSY_POLL |
dafcc438 | 389 | unsigned int sk_ll_usec; |
9115e8cd ED |
390 | /* ===== mostly read cache line ===== */ |
391 | unsigned int sk_napi_id; | |
b178bb3d | 392 | #endif |
b178bb3d ED |
393 | int sk_rcvbuf; |
394 | ||
395 | struct sk_filter __rcu *sk_filter; | |
ceb5d58b ED |
396 | union { |
397 | struct socket_wq __rcu *sk_wq; | |
398 | struct socket_wq *sk_wq_raw; | |
399 | }; | |
def8b4fa | 400 | #ifdef CONFIG_XFRM |
d188ba86 | 401 | struct xfrm_policy __rcu *sk_policy[2]; |
def8b4fa | 402 | #endif |
deaa5854 | 403 | struct dst_entry *sk_rx_dst; |
0e36cbb3 | 404 | struct dst_entry __rcu *sk_dst_cache; |
1da177e4 | 405 | atomic_t sk_omem_alloc; |
4e07a91c | 406 | int sk_sndbuf; |
9115e8cd ED |
407 | |
408 | /* ===== cache line for TX ===== */ | |
409 | int sk_wmem_queued; | |
14afee4b | 410 | refcount_t sk_wmem_alloc; |
9115e8cd | 411 | unsigned long sk_tsq_flags; |
75c119af ED |
412 | union { |
413 | struct sk_buff *sk_send_head; | |
414 | struct rb_root tcp_rtx_queue; | |
415 | }; | |
1da177e4 | 416 | struct sk_buff_head sk_write_queue; |
9115e8cd ED |
417 | __s32 sk_peek_off; |
418 | int sk_write_pending; | |
9b8805a3 | 419 | __u32 sk_dst_pending_confirm; |
218af599 | 420 | u32 sk_pacing_status; /* see enum sk_pacing */ |
9115e8cd ED |
421 | long sk_sndtimeo; |
422 | struct timer_list sk_timer; | |
423 | __u32 sk_priority; | |
424 | __u32 sk_mark; | |
76a9ebe8 ED |
425 | unsigned long sk_pacing_rate; /* bytes per second */ |
426 | unsigned long sk_max_pacing_rate; | |
9115e8cd ED |
427 | struct page_frag sk_frag; |
428 | netdev_features_t sk_route_caps; | |
429 | netdev_features_t sk_route_nocaps; | |
0a6b2a1d | 430 | netdev_features_t sk_route_forced_caps; |
9115e8cd ED |
431 | int sk_gso_type; |
432 | unsigned int sk_gso_max_size; | |
433 | gfp_t sk_allocation; | |
434 | __u32 sk_txhash; | |
fc64869c AR |
435 | |
436 | /* | |
437 | * Because of non atomicity rules, all | |
438 | * changes are protected by socket lock. | |
439 | */ | |
aa4c1037 DA |
440 | unsigned int __sk_flags_offset[0]; |
441 | #ifdef __BIG_ENDIAN_BITFIELD | |
442 | #define SK_FL_PROTO_SHIFT 16 | |
443 | #define SK_FL_PROTO_MASK 0x00ff0000 | |
444 | ||
445 | #define SK_FL_TYPE_SHIFT 0 | |
446 | #define SK_FL_TYPE_MASK 0x0000ffff | |
447 | #else | |
448 | #define SK_FL_PROTO_SHIFT 8 | |
449 | #define SK_FL_PROTO_MASK 0x0000ff00 | |
450 | ||
451 | #define SK_FL_TYPE_SHIFT 16 | |
452 | #define SK_FL_TYPE_MASK 0xffff0000 | |
453 | #endif | |
454 | ||
cdfbabfb DH |
455 | unsigned int sk_padding : 1, |
456 | sk_kern_sock : 1, | |
28448b80 TH |
457 | sk_no_check_tx : 1, |
458 | sk_no_check_rx : 1, | |
b178bb3d ED |
459 | sk_userlocks : 4, |
460 | sk_protocol : 8, | |
461 | sk_type : 16; | |
7bbadd2d | 462 | #define SK_PROTOCOL_MAX U8_MAX |
1485348d | 463 | u16 sk_gso_max_segs; |
3a9b76fd | 464 | u8 sk_pacing_shift; |
1da177e4 | 465 | unsigned long sk_lingertime; |
476e19cf | 466 | struct proto *sk_prot_creator; |
1da177e4 LT |
467 | rwlock_t sk_callback_lock; |
468 | int sk_err, | |
469 | sk_err_soft; | |
becb74f0 ED |
470 | u32 sk_ack_backlog; |
471 | u32 sk_max_ack_backlog; | |
86741ec2 | 472 | kuid_t sk_uid; |
109f6e39 EB |
473 | struct pid *sk_peer_pid; |
474 | const struct cred *sk_peer_cred; | |
1da177e4 | 475 | long sk_rcvtimeo; |
b7aa0bf7 | 476 | ktime_t sk_stamp; |
b9f40e21 | 477 | u16 sk_tsflags; |
fc64869c | 478 | u8 sk_shutdown; |
09c2d251 | 479 | u32 sk_tskey; |
52267790 | 480 | atomic_t sk_zckey; |
80b14dee RC |
481 | |
482 | u8 sk_clockid; | |
483 | u8 sk_txtime_deadline_mode : 1, | |
4b15c707 JSP |
484 | sk_txtime_report_errors : 1, |
485 | sk_txtime_unused : 6; | |
80b14dee | 486 | |
1da177e4 LT |
487 | struct socket *sk_socket; |
488 | void *sk_user_data; | |
d5f64238 | 489 | #ifdef CONFIG_SECURITY |
1da177e4 | 490 | void *sk_security; |
d5f64238 | 491 | #endif |
2a56a1fe | 492 | struct sock_cgroup_data sk_cgrp_data; |
baac50bb | 493 | struct mem_cgroup *sk_memcg; |
1da177e4 | 494 | void (*sk_state_change)(struct sock *sk); |
676d2369 | 495 | void (*sk_data_ready)(struct sock *sk); |
1da177e4 LT |
496 | void (*sk_write_space)(struct sock *sk); |
497 | void (*sk_error_report)(struct sock *sk); | |
dc6b9b78 ED |
498 | int (*sk_backlog_rcv)(struct sock *sk, |
499 | struct sk_buff *skb); | |
ebf4e808 IL |
500 | #ifdef CONFIG_SOCK_VALIDATE_XMIT |
501 | struct sk_buff* (*sk_validate_xmit_skb)(struct sock *sk, | |
502 | struct net_device *dev, | |
503 | struct sk_buff *skb); | |
504 | #endif | |
1da177e4 | 505 | void (*sk_destruct)(struct sock *sk); |
ef456144 | 506 | struct sock_reuseport __rcu *sk_reuseport_cb; |
a4298e45 | 507 | struct rcu_head sk_rcu; |
1da177e4 LT |
508 | }; |
509 | ||
218af599 ED |
510 | enum sk_pacing { |
511 | SK_PACING_NONE = 0, | |
512 | SK_PACING_NEEDED = 1, | |
513 | SK_PACING_FQ = 2, | |
514 | }; | |
515 | ||
559835ea PS |
516 | #define __sk_user_data(sk) ((*((void __rcu **)&(sk)->sk_user_data))) |
517 | ||
518 | #define rcu_dereference_sk_user_data(sk) rcu_dereference(__sk_user_data((sk))) | |
519 | #define rcu_assign_sk_user_data(sk, ptr) rcu_assign_pointer(__sk_user_data((sk)), ptr) | |
520 | ||
4a17fd52 PE |
521 | /* |
522 | * SK_CAN_REUSE and SK_NO_REUSE on a socket mean that the socket is OK | |
523 | * or not whether his port will be reused by someone else. SK_FORCE_REUSE | |
524 | * on a socket means that the socket will reuse everybody else's port | |
525 | * without looking at the other's sk_reuse value. | |
526 | */ | |
527 | ||
528 | #define SK_NO_REUSE 0 | |
529 | #define SK_CAN_REUSE 1 | |
530 | #define SK_FORCE_REUSE 2 | |
531 | ||
627d2d6b | 532 | int sk_set_peek_off(struct sock *sk, int val); |
533 | ||
ef64a54f PE |
534 | static inline int sk_peek_offset(struct sock *sk, int flags) |
535 | { | |
b9bb53f3 | 536 | if (unlikely(flags & MSG_PEEK)) { |
a0917e0b | 537 | return READ_ONCE(sk->sk_peek_off); |
b9bb53f3 WB |
538 | } |
539 | ||
540 | return 0; | |
ef64a54f PE |
541 | } |
542 | ||
543 | static inline void sk_peek_offset_bwd(struct sock *sk, int val) | |
544 | { | |
b9bb53f3 WB |
545 | s32 off = READ_ONCE(sk->sk_peek_off); |
546 | ||
547 | if (unlikely(off >= 0)) { | |
548 | off = max_t(s32, off - val, 0); | |
549 | WRITE_ONCE(sk->sk_peek_off, off); | |
ef64a54f PE |
550 | } |
551 | } | |
552 | ||
553 | static inline void sk_peek_offset_fwd(struct sock *sk, int val) | |
554 | { | |
b9bb53f3 | 555 | sk_peek_offset_bwd(sk, -val); |
ef64a54f PE |
556 | } |
557 | ||
1da177e4 LT |
558 | /* |
559 | * Hashed lists helper routines | |
560 | */ | |
c4146644 LZ |
561 | static inline struct sock *sk_entry(const struct hlist_node *node) |
562 | { | |
563 | return hlist_entry(node, struct sock, sk_node); | |
564 | } | |
565 | ||
e48c414e | 566 | static inline struct sock *__sk_head(const struct hlist_head *head) |
1da177e4 LT |
567 | { |
568 | return hlist_entry(head->first, struct sock, sk_node); | |
569 | } | |
570 | ||
e48c414e | 571 | static inline struct sock *sk_head(const struct hlist_head *head) |
1da177e4 LT |
572 | { |
573 | return hlist_empty(head) ? NULL : __sk_head(head); | |
574 | } | |
575 | ||
88ab1932 ED |
576 | static inline struct sock *__sk_nulls_head(const struct hlist_nulls_head *head) |
577 | { | |
578 | return hlist_nulls_entry(head->first, struct sock, sk_nulls_node); | |
579 | } | |
580 | ||
581 | static inline struct sock *sk_nulls_head(const struct hlist_nulls_head *head) | |
582 | { | |
583 | return hlist_nulls_empty(head) ? NULL : __sk_nulls_head(head); | |
584 | } | |
585 | ||
e48c414e | 586 | static inline struct sock *sk_next(const struct sock *sk) |
1da177e4 | 587 | { |
6c59ebd3 | 588 | return hlist_entry_safe(sk->sk_node.next, struct sock, sk_node); |
1da177e4 LT |
589 | } |
590 | ||
88ab1932 ED |
591 | static inline struct sock *sk_nulls_next(const struct sock *sk) |
592 | { | |
593 | return (!is_a_nulls(sk->sk_nulls_node.next)) ? | |
594 | hlist_nulls_entry(sk->sk_nulls_node.next, | |
595 | struct sock, sk_nulls_node) : | |
596 | NULL; | |
597 | } | |
598 | ||
dc6b9b78 | 599 | static inline bool sk_unhashed(const struct sock *sk) |
1da177e4 LT |
600 | { |
601 | return hlist_unhashed(&sk->sk_node); | |
602 | } | |
603 | ||
dc6b9b78 | 604 | static inline bool sk_hashed(const struct sock *sk) |
1da177e4 | 605 | { |
da753bea | 606 | return !sk_unhashed(sk); |
1da177e4 LT |
607 | } |
608 | ||
dc6b9b78 | 609 | static inline void sk_node_init(struct hlist_node *node) |
1da177e4 LT |
610 | { |
611 | node->pprev = NULL; | |
612 | } | |
613 | ||
dc6b9b78 | 614 | static inline void sk_nulls_node_init(struct hlist_nulls_node *node) |
88ab1932 ED |
615 | { |
616 | node->pprev = NULL; | |
617 | } | |
618 | ||
dc6b9b78 | 619 | static inline void __sk_del_node(struct sock *sk) |
1da177e4 LT |
620 | { |
621 | __hlist_del(&sk->sk_node); | |
622 | } | |
623 | ||
808f5114 | 624 | /* NB: equivalent to hlist_del_init_rcu */ |
dc6b9b78 | 625 | static inline bool __sk_del_node_init(struct sock *sk) |
1da177e4 LT |
626 | { |
627 | if (sk_hashed(sk)) { | |
628 | __sk_del_node(sk); | |
629 | sk_node_init(&sk->sk_node); | |
dc6b9b78 | 630 | return true; |
1da177e4 | 631 | } |
dc6b9b78 | 632 | return false; |
1da177e4 LT |
633 | } |
634 | ||
635 | /* Grab socket reference count. This operation is valid only | |
636 | when sk is ALREADY grabbed f.e. it is found in hash table | |
637 | or a list and the lookup is made under lock preventing hash table | |
638 | modifications. | |
639 | */ | |
640 | ||
f9a7cbbf | 641 | static __always_inline void sock_hold(struct sock *sk) |
1da177e4 | 642 | { |
41c6d650 | 643 | refcount_inc(&sk->sk_refcnt); |
1da177e4 LT |
644 | } |
645 | ||
646 | /* Ungrab socket in the context, which assumes that socket refcnt | |
647 | cannot hit zero, f.e. it is true in context of any socketcall. | |
648 | */ | |
f9a7cbbf | 649 | static __always_inline void __sock_put(struct sock *sk) |
1da177e4 | 650 | { |
41c6d650 | 651 | refcount_dec(&sk->sk_refcnt); |
1da177e4 LT |
652 | } |
653 | ||
dc6b9b78 | 654 | static inline bool sk_del_node_init(struct sock *sk) |
1da177e4 | 655 | { |
dc6b9b78 | 656 | bool rc = __sk_del_node_init(sk); |
1da177e4 LT |
657 | |
658 | if (rc) { | |
659 | /* paranoid for a while -acme */ | |
41c6d650 | 660 | WARN_ON(refcount_read(&sk->sk_refcnt) == 1); |
1da177e4 LT |
661 | __sock_put(sk); |
662 | } | |
663 | return rc; | |
664 | } | |
808f5114 | 665 | #define sk_del_node_init_rcu(sk) sk_del_node_init(sk) |
1da177e4 | 666 | |
dc6b9b78 | 667 | static inline bool __sk_nulls_del_node_init_rcu(struct sock *sk) |
271b72c7 ED |
668 | { |
669 | if (sk_hashed(sk)) { | |
88ab1932 | 670 | hlist_nulls_del_init_rcu(&sk->sk_nulls_node); |
dc6b9b78 | 671 | return true; |
271b72c7 | 672 | } |
dc6b9b78 | 673 | return false; |
271b72c7 ED |
674 | } |
675 | ||
dc6b9b78 | 676 | static inline bool sk_nulls_del_node_init_rcu(struct sock *sk) |
271b72c7 | 677 | { |
dc6b9b78 | 678 | bool rc = __sk_nulls_del_node_init_rcu(sk); |
271b72c7 ED |
679 | |
680 | if (rc) { | |
681 | /* paranoid for a while -acme */ | |
41c6d650 | 682 | WARN_ON(refcount_read(&sk->sk_refcnt) == 1); |
271b72c7 ED |
683 | __sock_put(sk); |
684 | } | |
685 | return rc; | |
686 | } | |
687 | ||
dc6b9b78 | 688 | static inline void __sk_add_node(struct sock *sk, struct hlist_head *list) |
1da177e4 LT |
689 | { |
690 | hlist_add_head(&sk->sk_node, list); | |
691 | } | |
692 | ||
dc6b9b78 | 693 | static inline void sk_add_node(struct sock *sk, struct hlist_head *list) |
1da177e4 LT |
694 | { |
695 | sock_hold(sk); | |
696 | __sk_add_node(sk, list); | |
697 | } | |
698 | ||
dc6b9b78 | 699 | static inline void sk_add_node_rcu(struct sock *sk, struct hlist_head *list) |
808f5114 | 700 | { |
701 | sock_hold(sk); | |
d296ba60 CG |
702 | if (IS_ENABLED(CONFIG_IPV6) && sk->sk_reuseport && |
703 | sk->sk_family == AF_INET6) | |
704 | hlist_add_tail_rcu(&sk->sk_node, list); | |
705 | else | |
706 | hlist_add_head_rcu(&sk->sk_node, list); | |
808f5114 | 707 | } |
708 | ||
dc6b9b78 | 709 | static inline void __sk_nulls_add_node_rcu(struct sock *sk, struct hlist_nulls_head *list) |
271b72c7 | 710 | { |
d7efc6c1 | 711 | hlist_nulls_add_head_rcu(&sk->sk_nulls_node, list); |
271b72c7 ED |
712 | } |
713 | ||
dc6b9b78 | 714 | static inline void sk_nulls_add_node_rcu(struct sock *sk, struct hlist_nulls_head *list) |
271b72c7 ED |
715 | { |
716 | sock_hold(sk); | |
88ab1932 | 717 | __sk_nulls_add_node_rcu(sk, list); |
271b72c7 ED |
718 | } |
719 | ||
dc6b9b78 | 720 | static inline void __sk_del_bind_node(struct sock *sk) |
1da177e4 LT |
721 | { |
722 | __hlist_del(&sk->sk_bind_node); | |
723 | } | |
724 | ||
dc6b9b78 | 725 | static inline void sk_add_bind_node(struct sock *sk, |
1da177e4 LT |
726 | struct hlist_head *list) |
727 | { | |
728 | hlist_add_head(&sk->sk_bind_node, list); | |
729 | } | |
730 | ||
b67bfe0d SL |
731 | #define sk_for_each(__sk, list) \ |
732 | hlist_for_each_entry(__sk, list, sk_node) | |
733 | #define sk_for_each_rcu(__sk, list) \ | |
734 | hlist_for_each_entry_rcu(__sk, list, sk_node) | |
88ab1932 ED |
735 | #define sk_nulls_for_each(__sk, node, list) \ |
736 | hlist_nulls_for_each_entry(__sk, node, list, sk_nulls_node) | |
737 | #define sk_nulls_for_each_rcu(__sk, node, list) \ | |
738 | hlist_nulls_for_each_entry_rcu(__sk, node, list, sk_nulls_node) | |
b67bfe0d SL |
739 | #define sk_for_each_from(__sk) \ |
740 | hlist_for_each_entry_from(__sk, sk_node) | |
88ab1932 ED |
741 | #define sk_nulls_for_each_from(__sk, node) \ |
742 | if (__sk && ({ node = &(__sk)->sk_nulls_node; 1; })) \ | |
743 | hlist_nulls_for_each_entry_from(__sk, node, sk_nulls_node) | |
b67bfe0d SL |
744 | #define sk_for_each_safe(__sk, tmp, list) \ |
745 | hlist_for_each_entry_safe(__sk, tmp, list, sk_node) | |
746 | #define sk_for_each_bound(__sk, list) \ | |
747 | hlist_for_each_entry(__sk, list, sk_bind_node) | |
1da177e4 | 748 | |
2dc41cff | 749 | /** |
ca065d0c | 750 | * sk_for_each_entry_offset_rcu - iterate over a list at a given struct offset |
2dc41cff DH |
751 | * @tpos: the type * to use as a loop cursor. |
752 | * @pos: the &struct hlist_node to use as a loop cursor. | |
753 | * @head: the head for your list. | |
754 | * @offset: offset of hlist_node within the struct. | |
755 | * | |
756 | */ | |
ca065d0c | 757 | #define sk_for_each_entry_offset_rcu(tpos, pos, head, offset) \ |
b6f4f848 | 758 | for (pos = rcu_dereference(hlist_first_rcu(head)); \ |
ca065d0c | 759 | pos != NULL && \ |
2dc41cff | 760 | ({ tpos = (typeof(*tpos) *)((void *)pos - offset); 1;}); \ |
b6f4f848 | 761 | pos = rcu_dereference(hlist_next_rcu(pos))) |
2dc41cff | 762 | |
c336d148 EB |
763 | static inline struct user_namespace *sk_user_ns(struct sock *sk) |
764 | { | |
765 | /* Careful only use this in a context where these parameters | |
766 | * can not change and must all be valid, such as recvmsg from | |
767 | * userspace. | |
768 | */ | |
769 | return sk->sk_socket->file->f_cred->user_ns; | |
770 | } | |
771 | ||
1da177e4 LT |
772 | /* Sock flags */ |
773 | enum sock_flags { | |
774 | SOCK_DEAD, | |
775 | SOCK_DONE, | |
776 | SOCK_URGINLINE, | |
777 | SOCK_KEEPOPEN, | |
778 | SOCK_LINGER, | |
779 | SOCK_DESTROY, | |
780 | SOCK_BROADCAST, | |
781 | SOCK_TIMESTAMP, | |
782 | SOCK_ZAPPED, | |
783 | SOCK_USE_WRITE_QUEUE, /* whether to call sk->sk_write_space in sock_wfree */ | |
784 | SOCK_DBG, /* %SO_DEBUG setting */ | |
785 | SOCK_RCVTSTAMP, /* %SO_TIMESTAMP setting */ | |
92f37fd2 | 786 | SOCK_RCVTSTAMPNS, /* %SO_TIMESTAMPNS setting */ |
1da177e4 LT |
787 | SOCK_LOCALROUTE, /* route locally only, %SO_DONTROUTE setting */ |
788 | SOCK_QUEUE_SHRUNK, /* write queue has been shrunk recently */ | |
7cb02404 | 789 | SOCK_MEMALLOC, /* VM depends on this socket for swapping */ |
20d49473 | 790 | SOCK_TIMESTAMPING_RX_SOFTWARE, /* %SOF_TIMESTAMPING_RX_SOFTWARE */ |
bcdce719 | 791 | SOCK_FASYNC, /* fasync() active */ |
3b885787 | 792 | SOCK_RXQ_OVFL, |
1cdebb42 | 793 | SOCK_ZEROCOPY, /* buffers from userspace */ |
6e3e939f | 794 | SOCK_WIFI_STATUS, /* push wifi status to userspace */ |
3bdc0eba BG |
795 | SOCK_NOFCS, /* Tell NIC not to do the Ethernet FCS. |
796 | * Will use last 4 bytes of packet sent from | |
797 | * user-space instead. | |
798 | */ | |
d59577b6 | 799 | SOCK_FILTER_LOCKED, /* Filter cannot be changed anymore */ |
7d4c04fc | 800 | SOCK_SELECT_ERR_QUEUE, /* Wake select on error queue */ |
a4298e45 | 801 | SOCK_RCU_FREE, /* wait rcu grace period in sk_destruct() */ |
80b14dee | 802 | SOCK_TXTIME, |
e4a2a304 | 803 | SOCK_XDP, /* XDP is attached */ |
1da177e4 LT |
804 | }; |
805 | ||
01ce63c9 MRL |
806 | #define SK_FLAGS_TIMESTAMP ((1UL << SOCK_TIMESTAMP) | (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE)) |
807 | ||
53b924b3 RB |
808 | static inline void sock_copy_flags(struct sock *nsk, struct sock *osk) |
809 | { | |
810 | nsk->sk_flags = osk->sk_flags; | |
811 | } | |
812 | ||
1da177e4 LT |
813 | static inline void sock_set_flag(struct sock *sk, enum sock_flags flag) |
814 | { | |
815 | __set_bit(flag, &sk->sk_flags); | |
816 | } | |
817 | ||
818 | static inline void sock_reset_flag(struct sock *sk, enum sock_flags flag) | |
819 | { | |
820 | __clear_bit(flag, &sk->sk_flags); | |
821 | } | |
822 | ||
1b23a5df | 823 | static inline bool sock_flag(const struct sock *sk, enum sock_flags flag) |
1da177e4 LT |
824 | { |
825 | return test_bit(flag, &sk->sk_flags); | |
826 | } | |
827 | ||
c93bdd0e | 828 | #ifdef CONFIG_NET |
a7950ae8 | 829 | DECLARE_STATIC_KEY_FALSE(memalloc_socks_key); |
c93bdd0e MG |
830 | static inline int sk_memalloc_socks(void) |
831 | { | |
a7950ae8 | 832 | return static_branch_unlikely(&memalloc_socks_key); |
c93bdd0e MG |
833 | } |
834 | #else | |
835 | ||
836 | static inline int sk_memalloc_socks(void) | |
837 | { | |
838 | return 0; | |
839 | } | |
840 | ||
841 | #endif | |
842 | ||
7450aaf6 | 843 | static inline gfp_t sk_gfp_mask(const struct sock *sk, gfp_t gfp_mask) |
99a1dec7 | 844 | { |
7450aaf6 | 845 | return gfp_mask | (sk->sk_allocation & __GFP_MEMALLOC); |
99a1dec7 MG |
846 | } |
847 | ||
1da177e4 LT |
848 | static inline void sk_acceptq_removed(struct sock *sk) |
849 | { | |
850 | sk->sk_ack_backlog--; | |
851 | } | |
852 | ||
853 | static inline void sk_acceptq_added(struct sock *sk) | |
854 | { | |
855 | sk->sk_ack_backlog++; | |
856 | } | |
857 | ||
dc6b9b78 | 858 | static inline bool sk_acceptq_is_full(const struct sock *sk) |
1da177e4 | 859 | { |
64a14651 | 860 | return sk->sk_ack_backlog > sk->sk_max_ack_backlog; |
1da177e4 LT |
861 | } |
862 | ||
863 | /* | |
864 | * Compute minimal free write space needed to queue new packets. | |
865 | */ | |
dc6b9b78 | 866 | static inline int sk_stream_min_wspace(const struct sock *sk) |
1da177e4 | 867 | { |
8df09ea3 | 868 | return sk->sk_wmem_queued >> 1; |
1da177e4 LT |
869 | } |
870 | ||
dc6b9b78 | 871 | static inline int sk_stream_wspace(const struct sock *sk) |
1da177e4 LT |
872 | { |
873 | return sk->sk_sndbuf - sk->sk_wmem_queued; | |
874 | } | |
875 | ||
69336bd2 | 876 | void sk_stream_write_space(struct sock *sk); |
1da177e4 | 877 | |
8eae939f | 878 | /* OOB backlog add */ |
a3a858ff | 879 | static inline void __sk_add_backlog(struct sock *sk, struct sk_buff *skb) |
9ee6b535 | 880 | { |
7fee226a | 881 | /* dont let skb dst not refcounted, we are going to leave rcu lock */ |
222d7dbd | 882 | skb_dst_force(skb); |
7fee226a ED |
883 | |
884 | if (!sk->sk_backlog.tail) | |
885 | sk->sk_backlog.head = skb; | |
886 | else | |
9ee6b535 | 887 | sk->sk_backlog.tail->next = skb; |
7fee226a ED |
888 | |
889 | sk->sk_backlog.tail = skb; | |
9ee6b535 SH |
890 | skb->next = NULL; |
891 | } | |
1da177e4 | 892 | |
c377411f ED |
893 | /* |
894 | * Take into account size of receive queue and backlog queue | |
0fd7bac6 ED |
895 | * Do not take into account this skb truesize, |
896 | * to allow even a single big packet to come. | |
c377411f | 897 | */ |
274f482d | 898 | static inline bool sk_rcvqueues_full(const struct sock *sk, unsigned int limit) |
c377411f ED |
899 | { |
900 | unsigned int qsize = sk->sk_backlog.len + atomic_read(&sk->sk_rmem_alloc); | |
901 | ||
f545a38f | 902 | return qsize > limit; |
c377411f ED |
903 | } |
904 | ||
8eae939f | 905 | /* The per-socket spinlock must be held here. */ |
f545a38f ED |
906 | static inline __must_check int sk_add_backlog(struct sock *sk, struct sk_buff *skb, |
907 | unsigned int limit) | |
8eae939f | 908 | { |
274f482d | 909 | if (sk_rcvqueues_full(sk, limit)) |
8eae939f ZY |
910 | return -ENOBUFS; |
911 | ||
c7c49b8f ED |
912 | /* |
913 | * If the skb was allocated from pfmemalloc reserves, only | |
914 | * allow SOCK_MEMALLOC sockets to use it as this socket is | |
915 | * helping free memory | |
916 | */ | |
917 | if (skb_pfmemalloc(skb) && !sock_flag(sk, SOCK_MEMALLOC)) | |
918 | return -ENOMEM; | |
919 | ||
a3a858ff | 920 | __sk_add_backlog(sk, skb); |
8eae939f ZY |
921 | sk->sk_backlog.len += skb->truesize; |
922 | return 0; | |
923 | } | |
924 | ||
69336bd2 | 925 | int __sk_backlog_rcv(struct sock *sk, struct sk_buff *skb); |
b4b9e355 | 926 | |
c57943a1 PZ |
927 | static inline int sk_backlog_rcv(struct sock *sk, struct sk_buff *skb) |
928 | { | |
b4b9e355 MG |
929 | if (sk_memalloc_socks() && skb_pfmemalloc(skb)) |
930 | return __sk_backlog_rcv(sk, skb); | |
931 | ||
c57943a1 PZ |
932 | return sk->sk_backlog_rcv(sk, skb); |
933 | } | |
934 | ||
2c8c56e1 ED |
935 | static inline void sk_incoming_cpu_update(struct sock *sk) |
936 | { | |
34cfb542 PA |
937 | int cpu = raw_smp_processor_id(); |
938 | ||
939 | if (unlikely(sk->sk_incoming_cpu != cpu)) | |
940 | sk->sk_incoming_cpu = cpu; | |
2c8c56e1 ED |
941 | } |
942 | ||
fe477558 | 943 | static inline void sock_rps_record_flow_hash(__u32 hash) |
c58dc01b DM |
944 | { |
945 | #ifdef CONFIG_RPS | |
946 | struct rps_sock_flow_table *sock_flow_table; | |
947 | ||
948 | rcu_read_lock(); | |
949 | sock_flow_table = rcu_dereference(rps_sock_flow_table); | |
fe477558 | 950 | rps_record_sock_flow(sock_flow_table, hash); |
c58dc01b DM |
951 | rcu_read_unlock(); |
952 | #endif | |
953 | } | |
954 | ||
fe477558 TH |
955 | static inline void sock_rps_record_flow(const struct sock *sk) |
956 | { | |
c9d8ca04 | 957 | #ifdef CONFIG_RPS |
13bfff25 ED |
958 | if (static_key_false(&rfs_needed)) { |
959 | /* Reading sk->sk_rxhash might incur an expensive cache line | |
960 | * miss. | |
961 | * | |
962 | * TCP_ESTABLISHED does cover almost all states where RFS | |
963 | * might be useful, and is cheaper [1] than testing : | |
964 | * IPv4: inet_sk(sk)->inet_daddr | |
965 | * IPv6: ipv6_addr_any(&sk->sk_v6_daddr) | |
966 | * OR an additional socket flag | |
967 | * [1] : sk_state and sk_prot are in the same cache line. | |
968 | */ | |
969 | if (sk->sk_state == TCP_ESTABLISHED) | |
970 | sock_rps_record_flow_hash(sk->sk_rxhash); | |
971 | } | |
c9d8ca04 | 972 | #endif |
fe477558 TH |
973 | } |
974 | ||
bdeab991 TH |
975 | static inline void sock_rps_save_rxhash(struct sock *sk, |
976 | const struct sk_buff *skb) | |
c58dc01b DM |
977 | { |
978 | #ifdef CONFIG_RPS | |
567e4b79 | 979 | if (unlikely(sk->sk_rxhash != skb->hash)) |
61b905da | 980 | sk->sk_rxhash = skb->hash; |
c58dc01b DM |
981 | #endif |
982 | } | |
983 | ||
bdeab991 TH |
984 | static inline void sock_rps_reset_rxhash(struct sock *sk) |
985 | { | |
986 | #ifdef CONFIG_RPS | |
bdeab991 TH |
987 | sk->sk_rxhash = 0; |
988 | #endif | |
989 | } | |
990 | ||
d9dc8b0f | 991 | #define sk_wait_event(__sk, __timeo, __condition, __wait) \ |
cfcabdcc SH |
992 | ({ int __rc; \ |
993 | release_sock(__sk); \ | |
994 | __rc = __condition; \ | |
995 | if (!__rc) { \ | |
d9dc8b0f WC |
996 | *(__timeo) = wait_woken(__wait, \ |
997 | TASK_INTERRUPTIBLE, \ | |
998 | *(__timeo)); \ | |
cfcabdcc | 999 | } \ |
d9dc8b0f | 1000 | sched_annotate_sleep(); \ |
cfcabdcc SH |
1001 | lock_sock(__sk); \ |
1002 | __rc = __condition; \ | |
1003 | __rc; \ | |
1004 | }) | |
1da177e4 | 1005 | |
69336bd2 JP |
1006 | int sk_stream_wait_connect(struct sock *sk, long *timeo_p); |
1007 | int sk_stream_wait_memory(struct sock *sk, long *timeo_p); | |
1008 | void sk_stream_wait_close(struct sock *sk, long timeo_p); | |
1009 | int sk_stream_error(struct sock *sk, int flags, int err); | |
1010 | void sk_stream_kill_queues(struct sock *sk); | |
1011 | void sk_set_memalloc(struct sock *sk); | |
1012 | void sk_clear_memalloc(struct sock *sk); | |
1da177e4 | 1013 | |
d41a69f1 ED |
1014 | void __sk_flush_backlog(struct sock *sk); |
1015 | ||
1016 | static inline bool sk_flush_backlog(struct sock *sk) | |
1017 | { | |
1018 | if (unlikely(READ_ONCE(sk->sk_backlog.tail))) { | |
1019 | __sk_flush_backlog(sk); | |
1020 | return true; | |
1021 | } | |
1022 | return false; | |
1023 | } | |
1024 | ||
dfbafc99 | 1025 | int sk_wait_data(struct sock *sk, long *timeo, const struct sk_buff *skb); |
1da177e4 | 1026 | |
60236fdd | 1027 | struct request_sock_ops; |
6d6ee43e | 1028 | struct timewait_sock_ops; |
ab1e0a13 | 1029 | struct inet_hashinfo; |
fc8717ba | 1030 | struct raw_hashinfo; |
f16a7dd5 | 1031 | struct smc_hashinfo; |
de477254 | 1032 | struct module; |
2e6599cb | 1033 | |
f77d6021 | 1034 | /* |
5f0d5a3a | 1035 | * caches using SLAB_TYPESAFE_BY_RCU should let .next pointer from nulls nodes |
f77d6021 ED |
1036 | * un-modified. Special care is taken when initializing object to zero. |
1037 | */ | |
1038 | static inline void sk_prot_clear_nulls(struct sock *sk, int size) | |
1039 | { | |
1040 | if (offsetof(struct sock, sk_node.next) != 0) | |
1041 | memset(sk, 0, offsetof(struct sock, sk_node.next)); | |
1042 | memset(&sk->sk_node.pprev, 0, | |
1043 | size - offsetof(struct sock, sk_node.pprev)); | |
1044 | } | |
1045 | ||
1da177e4 LT |
1046 | /* Networking protocol blocks we attach to sockets. |
1047 | * socket layer -> transport layer interface | |
1da177e4 LT |
1048 | */ |
1049 | struct proto { | |
dc6b9b78 | 1050 | void (*close)(struct sock *sk, |
1da177e4 | 1051 | long timeout); |
d74bad4e AI |
1052 | int (*pre_connect)(struct sock *sk, |
1053 | struct sockaddr *uaddr, | |
1054 | int addr_len); | |
1da177e4 | 1055 | int (*connect)(struct sock *sk, |
dc6b9b78 | 1056 | struct sockaddr *uaddr, |
1da177e4 LT |
1057 | int addr_len); |
1058 | int (*disconnect)(struct sock *sk, int flags); | |
1059 | ||
cdfbabfb DH |
1060 | struct sock * (*accept)(struct sock *sk, int flags, int *err, |
1061 | bool kern); | |
1da177e4 LT |
1062 | |
1063 | int (*ioctl)(struct sock *sk, int cmd, | |
1064 | unsigned long arg); | |
1065 | int (*init)(struct sock *sk); | |
7d06b2e0 | 1066 | void (*destroy)(struct sock *sk); |
1da177e4 | 1067 | void (*shutdown)(struct sock *sk, int how); |
dc6b9b78 | 1068 | int (*setsockopt)(struct sock *sk, int level, |
1da177e4 | 1069 | int optname, char __user *optval, |
b7058842 | 1070 | unsigned int optlen); |
dc6b9b78 ED |
1071 | int (*getsockopt)(struct sock *sk, int level, |
1072 | int optname, char __user *optval, | |
1073 | int __user *option); | |
4b9d07a4 | 1074 | void (*keepalive)(struct sock *sk, int valbool); |
af01d537 | 1075 | #ifdef CONFIG_COMPAT |
3fdadf7d DM |
1076 | int (*compat_setsockopt)(struct sock *sk, |
1077 | int level, | |
1078 | int optname, char __user *optval, | |
b7058842 | 1079 | unsigned int optlen); |
3fdadf7d DM |
1080 | int (*compat_getsockopt)(struct sock *sk, |
1081 | int level, | |
1082 | int optname, char __user *optval, | |
1083 | int __user *option); | |
709b46e8 EB |
1084 | int (*compat_ioctl)(struct sock *sk, |
1085 | unsigned int cmd, unsigned long arg); | |
af01d537 | 1086 | #endif |
1b784140 YX |
1087 | int (*sendmsg)(struct sock *sk, struct msghdr *msg, |
1088 | size_t len); | |
1089 | int (*recvmsg)(struct sock *sk, struct msghdr *msg, | |
dc6b9b78 ED |
1090 | size_t len, int noblock, int flags, |
1091 | int *addr_len); | |
1da177e4 LT |
1092 | int (*sendpage)(struct sock *sk, struct page *page, |
1093 | int offset, size_t size, int flags); | |
dc6b9b78 | 1094 | int (*bind)(struct sock *sk, |
1da177e4 LT |
1095 | struct sockaddr *uaddr, int addr_len); |
1096 | ||
dc6b9b78 | 1097 | int (*backlog_rcv) (struct sock *sk, |
1da177e4 LT |
1098 | struct sk_buff *skb); |
1099 | ||
46d3ceab ED |
1100 | void (*release_cb)(struct sock *sk); |
1101 | ||
1da177e4 | 1102 | /* Keeping track of sk's, looking them up, and port selection methods. */ |
086c653f | 1103 | int (*hash)(struct sock *sk); |
1da177e4 | 1104 | void (*unhash)(struct sock *sk); |
719f8358 | 1105 | void (*rehash)(struct sock *sk); |
1da177e4 LT |
1106 | int (*get_port)(struct sock *sk, unsigned short snum); |
1107 | ||
286ab3d4 | 1108 | /* Keeping track of sockets in use */ |
65f76517 | 1109 | #ifdef CONFIG_PROC_FS |
13ff3d6f | 1110 | unsigned int inuse_idx; |
65f76517 | 1111 | #endif |
ebb53d75 | 1112 | |
c9bee3b7 | 1113 | bool (*stream_memory_free)(const struct sock *sk); |
8934ce2f | 1114 | bool (*stream_memory_read)(const struct sock *sk); |
1da177e4 | 1115 | /* Memory pressure */ |
5c52ba17 | 1116 | void (*enter_memory_pressure)(struct sock *sk); |
06044751 | 1117 | void (*leave_memory_pressure)(struct sock *sk); |
8d987e5c | 1118 | atomic_long_t *memory_allocated; /* Current allocated memory. */ |
1748376b | 1119 | struct percpu_counter *sockets_allocated; /* Current number of sockets. */ |
1da177e4 LT |
1120 | /* |
1121 | * Pressure flag: try to collapse. | |
1122 | * Technical note: it is used by multiple contexts non atomically. | |
3ab224be | 1123 | * All the __sk_mem_schedule() is of this nature: accounting |
1da177e4 LT |
1124 | * is strict, actions are advisory and have some latency. |
1125 | */ | |
06044751 | 1126 | unsigned long *memory_pressure; |
8d987e5c | 1127 | long *sysctl_mem; |
a3dcaf17 | 1128 | |
1da177e4 LT |
1129 | int *sysctl_wmem; |
1130 | int *sysctl_rmem; | |
a3dcaf17 ED |
1131 | u32 sysctl_wmem_offset; |
1132 | u32 sysctl_rmem_offset; | |
1133 | ||
1da177e4 | 1134 | int max_header; |
7ba42910 | 1135 | bool no_autobind; |
1da177e4 | 1136 | |
271b72c7 | 1137 | struct kmem_cache *slab; |
1da177e4 | 1138 | unsigned int obj_size; |
d50112ed | 1139 | slab_flags_t slab_flags; |
7bbdb81e AD |
1140 | unsigned int useroffset; /* Usercopy region offset */ |
1141 | unsigned int usersize; /* Usercopy region size */ | |
1da177e4 | 1142 | |
dd24c001 | 1143 | struct percpu_counter *orphan_count; |
8feaf0c0 | 1144 | |
60236fdd | 1145 | struct request_sock_ops *rsk_prot; |
6d6ee43e | 1146 | struct timewait_sock_ops *twsk_prot; |
2e6599cb | 1147 | |
39d8cda7 PE |
1148 | union { |
1149 | struct inet_hashinfo *hashinfo; | |
645ca708 | 1150 | struct udp_table *udp_table; |
fc8717ba | 1151 | struct raw_hashinfo *raw_hash; |
f16a7dd5 | 1152 | struct smc_hashinfo *smc_hash; |
39d8cda7 | 1153 | } h; |
ab1e0a13 | 1154 | |
1da177e4 LT |
1155 | struct module *owner; |
1156 | ||
1157 | char name[32]; | |
1158 | ||
1159 | struct list_head node; | |
e6848976 ACM |
1160 | #ifdef SOCK_REFCNT_DEBUG |
1161 | atomic_t socks; | |
e1aab161 | 1162 | #endif |
64be0aed | 1163 | int (*diag_destroy)(struct sock *sk, int err); |
3859a271 | 1164 | } __randomize_layout; |
e1aab161 | 1165 | |
69336bd2 JP |
1166 | int proto_register(struct proto *prot, int alloc_slab); |
1167 | void proto_unregister(struct proto *prot); | |
bf2ae2e4 | 1168 | int sock_load_diag_module(int family, int protocol); |
1da177e4 | 1169 | |
e6848976 ACM |
1170 | #ifdef SOCK_REFCNT_DEBUG |
1171 | static inline void sk_refcnt_debug_inc(struct sock *sk) | |
1172 | { | |
1173 | atomic_inc(&sk->sk_prot->socks); | |
1174 | } | |
1175 | ||
1176 | static inline void sk_refcnt_debug_dec(struct sock *sk) | |
1177 | { | |
1178 | atomic_dec(&sk->sk_prot->socks); | |
1179 | printk(KERN_DEBUG "%s socket %p released, %d are still alive\n", | |
1180 | sk->sk_prot->name, sk, atomic_read(&sk->sk_prot->socks)); | |
1181 | } | |
1182 | ||
dec34fb0 | 1183 | static inline void sk_refcnt_debug_release(const struct sock *sk) |
e6848976 | 1184 | { |
41c6d650 | 1185 | if (refcount_read(&sk->sk_refcnt) != 1) |
e6848976 | 1186 | printk(KERN_DEBUG "Destruction of the %s socket %p delayed, refcnt=%d\n", |
41c6d650 | 1187 | sk->sk_prot->name, sk, refcount_read(&sk->sk_refcnt)); |
e6848976 ACM |
1188 | } |
1189 | #else /* SOCK_REFCNT_DEBUG */ | |
1190 | #define sk_refcnt_debug_inc(sk) do { } while (0) | |
1191 | #define sk_refcnt_debug_dec(sk) do { } while (0) | |
1192 | #define sk_refcnt_debug_release(sk) do { } while (0) | |
1193 | #endif /* SOCK_REFCNT_DEBUG */ | |
1194 | ||
c9bee3b7 ED |
1195 | static inline bool sk_stream_memory_free(const struct sock *sk) |
1196 | { | |
1197 | if (sk->sk_wmem_queued >= sk->sk_sndbuf) | |
1198 | return false; | |
1199 | ||
1200 | return sk->sk_prot->stream_memory_free ? | |
1201 | sk->sk_prot->stream_memory_free(sk) : true; | |
1202 | } | |
1203 | ||
64dc6130 ED |
1204 | static inline bool sk_stream_is_writeable(const struct sock *sk) |
1205 | { | |
c9bee3b7 ED |
1206 | return sk_stream_wspace(sk) >= sk_stream_min_wspace(sk) && |
1207 | sk_stream_memory_free(sk); | |
64dc6130 | 1208 | } |
e1aab161 | 1209 | |
54fd9c2d DB |
1210 | static inline int sk_under_cgroup_hierarchy(struct sock *sk, |
1211 | struct cgroup *ancestor) | |
1212 | { | |
1213 | #ifdef CONFIG_SOCK_CGROUP_DATA | |
1214 | return cgroup_is_descendant(sock_cgroup_ptr(&sk->sk_cgrp_data), | |
1215 | ancestor); | |
1216 | #else | |
1217 | return -ENOTSUPP; | |
1218 | #endif | |
1219 | } | |
c9bee3b7 | 1220 | |
180d8cd9 GC |
1221 | static inline bool sk_has_memory_pressure(const struct sock *sk) |
1222 | { | |
1223 | return sk->sk_prot->memory_pressure != NULL; | |
1224 | } | |
1225 | ||
1226 | static inline bool sk_under_memory_pressure(const struct sock *sk) | |
1227 | { | |
1228 | if (!sk->sk_prot->memory_pressure) | |
1229 | return false; | |
e1aab161 | 1230 | |
baac50bb JW |
1231 | if (mem_cgroup_sockets_enabled && sk->sk_memcg && |
1232 | mem_cgroup_under_socket_pressure(sk->sk_memcg)) | |
e805605c | 1233 | return true; |
e1aab161 | 1234 | |
35b87f6c | 1235 | return !!*sk->sk_prot->memory_pressure; |
180d8cd9 GC |
1236 | } |
1237 | ||
180d8cd9 GC |
1238 | static inline long |
1239 | sk_memory_allocated(const struct sock *sk) | |
1240 | { | |
e805605c | 1241 | return atomic_long_read(sk->sk_prot->memory_allocated); |
180d8cd9 GC |
1242 | } |
1243 | ||
1244 | static inline long | |
e805605c | 1245 | sk_memory_allocated_add(struct sock *sk, int amt) |
180d8cd9 | 1246 | { |
e805605c | 1247 | return atomic_long_add_return(amt, sk->sk_prot->memory_allocated); |
180d8cd9 GC |
1248 | } |
1249 | ||
1250 | static inline void | |
0e90b31f | 1251 | sk_memory_allocated_sub(struct sock *sk, int amt) |
180d8cd9 | 1252 | { |
e805605c | 1253 | atomic_long_sub(amt, sk->sk_prot->memory_allocated); |
180d8cd9 GC |
1254 | } |
1255 | ||
1256 | static inline void sk_sockets_allocated_dec(struct sock *sk) | |
1257 | { | |
af95d7df | 1258 | percpu_counter_dec(sk->sk_prot->sockets_allocated); |
180d8cd9 GC |
1259 | } |
1260 | ||
1261 | static inline void sk_sockets_allocated_inc(struct sock *sk) | |
1262 | { | |
af95d7df | 1263 | percpu_counter_inc(sk->sk_prot->sockets_allocated); |
180d8cd9 GC |
1264 | } |
1265 | ||
1266 | static inline int | |
1267 | sk_sockets_allocated_read_positive(struct sock *sk) | |
1268 | { | |
af95d7df | 1269 | return percpu_counter_read_positive(sk->sk_prot->sockets_allocated); |
180d8cd9 GC |
1270 | } |
1271 | ||
1272 | static inline int | |
1273 | proto_sockets_allocated_sum_positive(struct proto *prot) | |
1274 | { | |
1275 | return percpu_counter_sum_positive(prot->sockets_allocated); | |
1276 | } | |
1277 | ||
1278 | static inline long | |
1279 | proto_memory_allocated(struct proto *prot) | |
1280 | { | |
1281 | return atomic_long_read(prot->memory_allocated); | |
1282 | } | |
1283 | ||
1284 | static inline bool | |
1285 | proto_memory_pressure(struct proto *prot) | |
1286 | { | |
1287 | if (!prot->memory_pressure) | |
1288 | return false; | |
1289 | return !!*prot->memory_pressure; | |
1290 | } | |
1291 | ||
65f76517 ED |
1292 | |
1293 | #ifdef CONFIG_PROC_FS | |
1da177e4 | 1294 | /* Called with local bh disabled */ |
69336bd2 JP |
1295 | void sock_prot_inuse_add(struct net *net, struct proto *prot, int inc); |
1296 | int sock_prot_inuse_get(struct net *net, struct proto *proto); | |
648845ab | 1297 | int sock_inuse_get(struct net *net); |
65f76517 | 1298 | #else |
dc6b9b78 | 1299 | static inline void sock_prot_inuse_add(struct net *net, struct proto *prot, |
c29a0bc4 | 1300 | int inc) |
65f76517 ED |
1301 | { |
1302 | } | |
65f76517 ED |
1303 | #endif |
1304 | ||
1da177e4 | 1305 | |
614c6cb4 ACM |
1306 | /* With per-bucket locks this operation is not-atomic, so that |
1307 | * this version is not worse. | |
1308 | */ | |
086c653f | 1309 | static inline int __sk_prot_rehash(struct sock *sk) |
614c6cb4 ACM |
1310 | { |
1311 | sk->sk_prot->unhash(sk); | |
086c653f | 1312 | return sk->sk_prot->hash(sk); |
614c6cb4 ACM |
1313 | } |
1314 | ||
1da177e4 LT |
1315 | /* About 10 seconds */ |
1316 | #define SOCK_DESTROY_TIME (10*HZ) | |
1317 | ||
1318 | /* Sockets 0-1023 can't be bound to unless you are superuser */ | |
1319 | #define PROT_SOCK 1024 | |
1320 | ||
1321 | #define SHUTDOWN_MASK 3 | |
1322 | #define RCV_SHUTDOWN 1 | |
1323 | #define SEND_SHUTDOWN 2 | |
1324 | ||
1325 | #define SOCK_SNDBUF_LOCK 1 | |
1326 | #define SOCK_RCVBUF_LOCK 2 | |
1327 | #define SOCK_BINDADDR_LOCK 4 | |
1328 | #define SOCK_BINDPORT_LOCK 8 | |
1329 | ||
1da177e4 LT |
1330 | struct socket_alloc { |
1331 | struct socket socket; | |
1332 | struct inode vfs_inode; | |
1333 | }; | |
1334 | ||
1335 | static inline struct socket *SOCKET_I(struct inode *inode) | |
1336 | { | |
1337 | return &container_of(inode, struct socket_alloc, vfs_inode)->socket; | |
1338 | } | |
1339 | ||
1340 | static inline struct inode *SOCK_INODE(struct socket *socket) | |
1341 | { | |
1342 | return &container_of(socket, struct socket_alloc, socket)->vfs_inode; | |
1343 | } | |
1344 | ||
3ab224be HA |
1345 | /* |
1346 | * Functions for memory accounting | |
1347 | */ | |
f8c3bf00 | 1348 | int __sk_mem_raise_allocated(struct sock *sk, int size, int amt, int kind); |
69336bd2 | 1349 | int __sk_mem_schedule(struct sock *sk, int size, int kind); |
f8c3bf00 | 1350 | void __sk_mem_reduce_allocated(struct sock *sk, int amount); |
1a24e04e | 1351 | void __sk_mem_reclaim(struct sock *sk, int amount); |
1da177e4 | 1352 | |
bd68a2a8 ED |
1353 | /* We used to have PAGE_SIZE here, but systems with 64KB pages |
1354 | * do not necessarily have 16x time more memory than 4KB ones. | |
1355 | */ | |
1356 | #define SK_MEM_QUANTUM 4096 | |
3ab224be HA |
1357 | #define SK_MEM_QUANTUM_SHIFT ilog2(SK_MEM_QUANTUM) |
1358 | #define SK_MEM_SEND 0 | |
1359 | #define SK_MEM_RECV 1 | |
1da177e4 | 1360 | |
bd68a2a8 ED |
1361 | /* sysctl_mem values are in pages, we convert them in SK_MEM_QUANTUM units */ |
1362 | static inline long sk_prot_mem_limits(const struct sock *sk, int index) | |
1363 | { | |
1364 | long val = sk->sk_prot->sysctl_mem[index]; | |
1365 | ||
1366 | #if PAGE_SIZE > SK_MEM_QUANTUM | |
1367 | val <<= PAGE_SHIFT - SK_MEM_QUANTUM_SHIFT; | |
1368 | #elif PAGE_SIZE < SK_MEM_QUANTUM | |
1369 | val >>= SK_MEM_QUANTUM_SHIFT - PAGE_SHIFT; | |
1370 | #endif | |
1371 | return val; | |
1372 | } | |
1373 | ||
3ab224be | 1374 | static inline int sk_mem_pages(int amt) |
1da177e4 | 1375 | { |
3ab224be | 1376 | return (amt + SK_MEM_QUANTUM - 1) >> SK_MEM_QUANTUM_SHIFT; |
1da177e4 LT |
1377 | } |
1378 | ||
dc6b9b78 | 1379 | static inline bool sk_has_account(struct sock *sk) |
1da177e4 | 1380 | { |
3ab224be HA |
1381 | /* return true if protocol supports memory accounting */ |
1382 | return !!sk->sk_prot->memory_allocated; | |
1da177e4 LT |
1383 | } |
1384 | ||
dc6b9b78 | 1385 | static inline bool sk_wmem_schedule(struct sock *sk, int size) |
1da177e4 | 1386 | { |
3ab224be | 1387 | if (!sk_has_account(sk)) |
dc6b9b78 | 1388 | return true; |
3ab224be HA |
1389 | return size <= sk->sk_forward_alloc || |
1390 | __sk_mem_schedule(sk, size, SK_MEM_SEND); | |
1da177e4 LT |
1391 | } |
1392 | ||
c76562b6 | 1393 | static inline bool |
35c448a8 | 1394 | sk_rmem_schedule(struct sock *sk, struct sk_buff *skb, int size) |
d80d99d6 | 1395 | { |
3ab224be | 1396 | if (!sk_has_account(sk)) |
dc6b9b78 | 1397 | return true; |
c76562b6 MG |
1398 | return size<= sk->sk_forward_alloc || |
1399 | __sk_mem_schedule(sk, size, SK_MEM_RECV) || | |
1400 | skb_pfmemalloc(skb); | |
3ab224be HA |
1401 | } |
1402 | ||
1403 | static inline void sk_mem_reclaim(struct sock *sk) | |
1404 | { | |
1405 | if (!sk_has_account(sk)) | |
1406 | return; | |
1407 | if (sk->sk_forward_alloc >= SK_MEM_QUANTUM) | |
1a24e04e | 1408 | __sk_mem_reclaim(sk, sk->sk_forward_alloc); |
3ab224be HA |
1409 | } |
1410 | ||
9993e7d3 DM |
1411 | static inline void sk_mem_reclaim_partial(struct sock *sk) |
1412 | { | |
1413 | if (!sk_has_account(sk)) | |
1414 | return; | |
1415 | if (sk->sk_forward_alloc > SK_MEM_QUANTUM) | |
1a24e04e | 1416 | __sk_mem_reclaim(sk, sk->sk_forward_alloc - 1); |
9993e7d3 DM |
1417 | } |
1418 | ||
3ab224be HA |
1419 | static inline void sk_mem_charge(struct sock *sk, int size) |
1420 | { | |
1421 | if (!sk_has_account(sk)) | |
1422 | return; | |
1423 | sk->sk_forward_alloc -= size; | |
1424 | } | |
1425 | ||
1426 | static inline void sk_mem_uncharge(struct sock *sk, int size) | |
1427 | { | |
1428 | if (!sk_has_account(sk)) | |
1429 | return; | |
1430 | sk->sk_forward_alloc += size; | |
20c64d5c ED |
1431 | |
1432 | /* Avoid a possible overflow. | |
1433 | * TCP send queues can make this happen, if sk_mem_reclaim() | |
1434 | * is not called and more than 2 GBytes are released at once. | |
1435 | * | |
1436 | * If we reach 2 MBytes, reclaim 1 MBytes right now, there is | |
1437 | * no need to hold that much forward allocation anyway. | |
1438 | */ | |
1439 | if (unlikely(sk->sk_forward_alloc >= 1 << 21)) | |
1440 | __sk_mem_reclaim(sk, 1 << 20); | |
3ab224be HA |
1441 | } |
1442 | ||
1443 | static inline void sk_wmem_free_skb(struct sock *sk, struct sk_buff *skb) | |
1444 | { | |
3ab224be HA |
1445 | sock_set_flag(sk, SOCK_QUEUE_SHRUNK); |
1446 | sk->sk_wmem_queued -= skb->truesize; | |
1447 | sk_mem_uncharge(sk, skb->truesize); | |
1448 | __kfree_skb(skb); | |
d80d99d6 HX |
1449 | } |
1450 | ||
c3f9b018 ED |
1451 | static inline void sock_release_ownership(struct sock *sk) |
1452 | { | |
61881cfb HFS |
1453 | if (sk->sk_lock.owned) { |
1454 | sk->sk_lock.owned = 0; | |
1455 | ||
1456 | /* The sk_lock has mutex_unlock() semantics: */ | |
1457 | mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_); | |
1458 | } | |
c3f9b018 ED |
1459 | } |
1460 | ||
ed07536e PZ |
1461 | /* |
1462 | * Macro so as to not evaluate some arguments when | |
1463 | * lockdep is not enabled. | |
1464 | * | |
1465 | * Mark both the sk_lock and the sk_lock.slock as a | |
1466 | * per-address-family lock class. | |
1467 | */ | |
dc6b9b78 | 1468 | #define sock_lock_init_class_and_name(sk, sname, skey, name, key) \ |
ed07536e | 1469 | do { \ |
e8f6fbf6 | 1470 | sk->sk_lock.owned = 0; \ |
ed07536e PZ |
1471 | init_waitqueue_head(&sk->sk_lock.wq); \ |
1472 | spin_lock_init(&(sk)->sk_lock.slock); \ | |
1473 | debug_check_no_locks_freed((void *)&(sk)->sk_lock, \ | |
1474 | sizeof((sk)->sk_lock)); \ | |
1475 | lockdep_set_class_and_name(&(sk)->sk_lock.slock, \ | |
dc6b9b78 | 1476 | (skey), (sname)); \ |
ed07536e PZ |
1477 | lockdep_init_map(&(sk)->sk_lock.dep_map, (name), (key), 0); \ |
1478 | } while (0) | |
1479 | ||
b33b0a1b | 1480 | #ifdef CONFIG_LOCKDEP |
05b93801 | 1481 | static inline bool lockdep_sock_is_held(const struct sock *sk) |
1e1d04e6 | 1482 | { |
1e1d04e6 HFS |
1483 | return lockdep_is_held(&sk->sk_lock) || |
1484 | lockdep_is_held(&sk->sk_lock.slock); | |
1485 | } | |
b33b0a1b | 1486 | #endif |
1e1d04e6 | 1487 | |
69336bd2 | 1488 | void lock_sock_nested(struct sock *sk, int subclass); |
fcc70d5f PZ |
1489 | |
1490 | static inline void lock_sock(struct sock *sk) | |
1491 | { | |
1492 | lock_sock_nested(sk, 0); | |
1493 | } | |
1494 | ||
8873c064 | 1495 | void __release_sock(struct sock *sk); |
69336bd2 | 1496 | void release_sock(struct sock *sk); |
1da177e4 LT |
1497 | |
1498 | /* BH context may only use the following locking interface. */ | |
1499 | #define bh_lock_sock(__sk) spin_lock(&((__sk)->sk_lock.slock)) | |
c6366184 IM |
1500 | #define bh_lock_sock_nested(__sk) \ |
1501 | spin_lock_nested(&((__sk)->sk_lock.slock), \ | |
1502 | SINGLE_DEPTH_NESTING) | |
1da177e4 LT |
1503 | #define bh_unlock_sock(__sk) spin_unlock(&((__sk)->sk_lock.slock)) |
1504 | ||
69336bd2 | 1505 | bool lock_sock_fast(struct sock *sk); |
8a74ad60 ED |
1506 | /** |
1507 | * unlock_sock_fast - complement of lock_sock_fast | |
1508 | * @sk: socket | |
1509 | * @slow: slow mode | |
1510 | * | |
1511 | * fast unlock socket for user context. | |
1512 | * If slow mode is on, we call regular release_sock() | |
1513 | */ | |
1514 | static inline void unlock_sock_fast(struct sock *sk, bool slow) | |
4b0b72f7 | 1515 | { |
8a74ad60 ED |
1516 | if (slow) |
1517 | release_sock(sk); | |
1518 | else | |
1519 | spin_unlock_bh(&sk->sk_lock.slock); | |
4b0b72f7 ED |
1520 | } |
1521 | ||
fafc4e1e HFS |
1522 | /* Used by processes to "lock" a socket state, so that |
1523 | * interrupts and bottom half handlers won't change it | |
1524 | * from under us. It essentially blocks any incoming | |
1525 | * packets, so that we won't get any new data or any | |
1526 | * packets that change the state of the socket. | |
1527 | * | |
1528 | * While locked, BH processing will add new packets to | |
1529 | * the backlog queue. This queue is processed by the | |
1530 | * owner of the socket lock right before it is released. | |
1531 | * | |
1532 | * Since ~2.3.5 it is also exclusive sleep lock serializing | |
1533 | * accesses from user process context. | |
1534 | */ | |
1535 | ||
46cc6e49 | 1536 | static inline void sock_owned_by_me(const struct sock *sk) |
fafc4e1e HFS |
1537 | { |
1538 | #ifdef CONFIG_LOCKDEP | |
5e91f6ce | 1539 | WARN_ON_ONCE(!lockdep_sock_is_held(sk) && debug_locks); |
fafc4e1e | 1540 | #endif |
46cc6e49 ED |
1541 | } |
1542 | ||
1543 | static inline bool sock_owned_by_user(const struct sock *sk) | |
1544 | { | |
1545 | sock_owned_by_me(sk); | |
fafc4e1e HFS |
1546 | return sk->sk_lock.owned; |
1547 | } | |
1548 | ||
602f7a27 TH |
1549 | static inline bool sock_owned_by_user_nocheck(const struct sock *sk) |
1550 | { | |
1551 | return sk->sk_lock.owned; | |
1552 | } | |
1553 | ||
fafc4e1e HFS |
1554 | /* no reclassification while locks are held */ |
1555 | static inline bool sock_allow_reclassification(const struct sock *csk) | |
1556 | { | |
1557 | struct sock *sk = (struct sock *)csk; | |
1558 | ||
1559 | return !sk->sk_lock.owned && !spin_is_locked(&sk->sk_lock.slock); | |
1560 | } | |
4b0b72f7 | 1561 | |
69336bd2 | 1562 | struct sock *sk_alloc(struct net *net, int family, gfp_t priority, |
11aa9c28 | 1563 | struct proto *prot, int kern); |
69336bd2 | 1564 | void sk_free(struct sock *sk); |
eb4cb008 | 1565 | void sk_destruct(struct sock *sk); |
69336bd2 | 1566 | struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority); |
94352d45 | 1567 | void sk_free_unlock_clone(struct sock *sk); |
69336bd2 JP |
1568 | |
1569 | struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force, | |
1570 | gfp_t priority); | |
1d2077ac | 1571 | void __sock_wfree(struct sk_buff *skb); |
69336bd2 | 1572 | void sock_wfree(struct sk_buff *skb); |
98ba0bd5 WB |
1573 | struct sk_buff *sock_omalloc(struct sock *sk, unsigned long size, |
1574 | gfp_t priority); | |
69336bd2 JP |
1575 | void skb_orphan_partial(struct sk_buff *skb); |
1576 | void sock_rfree(struct sk_buff *skb); | |
62bccb8c | 1577 | void sock_efree(struct sk_buff *skb); |
82eabd9e | 1578 | #ifdef CONFIG_INET |
69336bd2 | 1579 | void sock_edemux(struct sk_buff *skb); |
82eabd9e | 1580 | #else |
158f323b | 1581 | #define sock_edemux sock_efree |
82eabd9e | 1582 | #endif |
69336bd2 JP |
1583 | |
1584 | int sock_setsockopt(struct socket *sock, int level, int op, | |
1585 | char __user *optval, unsigned int optlen); | |
1586 | ||
1587 | int sock_getsockopt(struct socket *sock, int level, int op, | |
1588 | char __user *optval, int __user *optlen); | |
1589 | struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size, | |
1590 | int noblock, int *errcode); | |
1591 | struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len, | |
1592 | unsigned long data_len, int noblock, | |
1593 | int *errcode, int max_page_order); | |
1594 | void *sock_kmalloc(struct sock *sk, int size, gfp_t priority); | |
1595 | void sock_kfree_s(struct sock *sk, void *mem, int size); | |
79e88659 | 1596 | void sock_kzfree_s(struct sock *sk, void *mem, int size); |
69336bd2 | 1597 | void sk_send_sigurg(struct sock *sk); |
1da177e4 | 1598 | |
f28ea365 | 1599 | struct sockcm_cookie { |
80b14dee | 1600 | u64 transmit_time; |
f28ea365 | 1601 | u32 mark; |
3dd17e63 | 1602 | u16 tsflags; |
f28ea365 EJ |
1603 | }; |
1604 | ||
657a0667 WB |
1605 | static inline void sockcm_init(struct sockcm_cookie *sockc, |
1606 | const struct sock *sk) | |
1607 | { | |
1608 | *sockc = (struct sockcm_cookie) { .tsflags = sk->sk_tsflags }; | |
1609 | } | |
1610 | ||
39771b12 WB |
1611 | int __sock_cmsg_send(struct sock *sk, struct msghdr *msg, struct cmsghdr *cmsg, |
1612 | struct sockcm_cookie *sockc); | |
f28ea365 EJ |
1613 | int sock_cmsg_send(struct sock *sk, struct msghdr *msg, |
1614 | struct sockcm_cookie *sockc); | |
1615 | ||
1da177e4 LT |
1616 | /* |
1617 | * Functions to fill in entries in struct proto_ops when a protocol | |
1618 | * does not implement a particular function. | |
1619 | */ | |
69336bd2 JP |
1620 | int sock_no_bind(struct socket *, struct sockaddr *, int); |
1621 | int sock_no_connect(struct socket *, struct sockaddr *, int, int); | |
1622 | int sock_no_socketpair(struct socket *, struct socket *); | |
cdfbabfb | 1623 | int sock_no_accept(struct socket *, struct socket *, int, bool); |
9b2c45d4 | 1624 | int sock_no_getname(struct socket *, struct sockaddr *, int); |
69336bd2 JP |
1625 | int sock_no_ioctl(struct socket *, unsigned int, unsigned long); |
1626 | int sock_no_listen(struct socket *, int); | |
1627 | int sock_no_shutdown(struct socket *, int); | |
1628 | int sock_no_getsockopt(struct socket *, int , int, char __user *, int __user *); | |
1629 | int sock_no_setsockopt(struct socket *, int, int, char __user *, unsigned int); | |
1b784140 | 1630 | int sock_no_sendmsg(struct socket *, struct msghdr *, size_t); |
306b13eb | 1631 | int sock_no_sendmsg_locked(struct sock *sk, struct msghdr *msg, size_t len); |
1b784140 | 1632 | int sock_no_recvmsg(struct socket *, struct msghdr *, size_t, int); |
69336bd2 JP |
1633 | int sock_no_mmap(struct file *file, struct socket *sock, |
1634 | struct vm_area_struct *vma); | |
1635 | ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, | |
1636 | size_t size, int flags); | |
306b13eb TH |
1637 | ssize_t sock_no_sendpage_locked(struct sock *sk, struct page *page, |
1638 | int offset, size_t size, int flags); | |
1da177e4 LT |
1639 | |
1640 | /* | |
1641 | * Functions to fill in entries in struct proto_ops when a protocol | |
1642 | * uses the inet style. | |
1643 | */ | |
69336bd2 | 1644 | int sock_common_getsockopt(struct socket *sock, int level, int optname, |
1da177e4 | 1645 | char __user *optval, int __user *optlen); |
1b784140 YX |
1646 | int sock_common_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, |
1647 | int flags); | |
69336bd2 | 1648 | int sock_common_setsockopt(struct socket *sock, int level, int optname, |
b7058842 | 1649 | char __user *optval, unsigned int optlen); |
69336bd2 | 1650 | int compat_sock_common_getsockopt(struct socket *sock, int level, |
3fdadf7d | 1651 | int optname, char __user *optval, int __user *optlen); |
69336bd2 | 1652 | int compat_sock_common_setsockopt(struct socket *sock, int level, |
b7058842 | 1653 | int optname, char __user *optval, unsigned int optlen); |
1da177e4 | 1654 | |
69336bd2 | 1655 | void sk_common_release(struct sock *sk); |
1da177e4 LT |
1656 | |
1657 | /* | |
1658 | * Default socket callbacks and setup code | |
1659 | */ | |
dc6b9b78 | 1660 | |
1da177e4 | 1661 | /* Initialise core socket variables */ |
69336bd2 | 1662 | void sock_init_data(struct socket *sock, struct sock *sk); |
1da177e4 | 1663 | |
1da177e4 LT |
1664 | /* |
1665 | * Socket reference counting postulates. | |
1666 | * | |
1667 | * * Each user of socket SHOULD hold a reference count. | |
1668 | * * Each access point to socket (an hash table bucket, reference from a list, | |
1669 | * running timer, skb in flight MUST hold a reference count. | |
1670 | * * When reference count hits 0, it means it will never increase back. | |
1671 | * * When reference count hits 0, it means that no references from | |
1672 | * outside exist to this socket and current process on current CPU | |
1673 | * is last user and may/should destroy this socket. | |
1674 | * * sk_free is called from any context: process, BH, IRQ. When | |
1675 | * it is called, socket has no references from outside -> sk_free | |
1676 | * may release descendant resources allocated by the socket, but | |
1677 | * to the time when it is called, socket is NOT referenced by any | |
1678 | * hash tables, lists etc. | |
1679 | * * Packets, delivered from outside (from network or from another process) | |
1680 | * and enqueued on receive/error queues SHOULD NOT grab reference count, | |
1681 | * when they sit in queue. Otherwise, packets will leak to hole, when | |
1682 | * socket is looked up by one cpu and unhasing is made by another CPU. | |
1683 | * It is true for udp/raw, netlink (leak to receive and error queues), tcp | |
1684 | * (leak to backlog). Packet socket does all the processing inside | |
1685 | * BR_NETPROTO_LOCK, so that it has not this race condition. UNIX sockets | |
1686 | * use separate SMP lock, so that they are prone too. | |
1687 | */ | |
1688 | ||
1689 | /* Ungrab socket and destroy it, if it was the last reference. */ | |
1690 | static inline void sock_put(struct sock *sk) | |
1691 | { | |
41c6d650 | 1692 | if (refcount_dec_and_test(&sk->sk_refcnt)) |
1da177e4 LT |
1693 | sk_free(sk); |
1694 | } | |
05dbc7b5 | 1695 | /* Generic version of sock_put(), dealing with all sockets |
41b822c5 | 1696 | * (TCP_TIMEWAIT, TCP_NEW_SYN_RECV, ESTABLISHED...) |
05dbc7b5 ED |
1697 | */ |
1698 | void sock_gen_put(struct sock *sk); | |
1da177e4 | 1699 | |
4f0c40d9 | 1700 | int __sk_receive_skb(struct sock *sk, struct sk_buff *skb, const int nested, |
c3f24cfb | 1701 | unsigned int trim_cap, bool refcounted); |
4f0c40d9 WB |
1702 | static inline int sk_receive_skb(struct sock *sk, struct sk_buff *skb, |
1703 | const int nested) | |
1704 | { | |
c3f24cfb | 1705 | return __sk_receive_skb(sk, skb, nested, 1, true); |
4f0c40d9 | 1706 | } |
25995ff5 | 1707 | |
e022f0b4 KK |
1708 | static inline void sk_tx_queue_set(struct sock *sk, int tx_queue) |
1709 | { | |
755c31cd AN |
1710 | /* sk_tx_queue_mapping accept only upto a 16-bit value */ |
1711 | if (WARN_ON_ONCE((unsigned short)tx_queue >= USHRT_MAX)) | |
1712 | return; | |
e022f0b4 KK |
1713 | sk->sk_tx_queue_mapping = tx_queue; |
1714 | } | |
1715 | ||
755c31cd AN |
1716 | #define NO_QUEUE_MAPPING USHRT_MAX |
1717 | ||
e022f0b4 KK |
1718 | static inline void sk_tx_queue_clear(struct sock *sk) |
1719 | { | |
755c31cd | 1720 | sk->sk_tx_queue_mapping = NO_QUEUE_MAPPING; |
e022f0b4 KK |
1721 | } |
1722 | ||
1723 | static inline int sk_tx_queue_get(const struct sock *sk) | |
1724 | { | |
755c31cd AN |
1725 | if (sk && sk->sk_tx_queue_mapping != NO_QUEUE_MAPPING) |
1726 | return sk->sk_tx_queue_mapping; | |
1727 | ||
1728 | return -1; | |
e022f0b4 KK |
1729 | } |
1730 | ||
c6345ce7 AN |
1731 | static inline void sk_rx_queue_set(struct sock *sk, const struct sk_buff *skb) |
1732 | { | |
1733 | #ifdef CONFIG_XPS | |
1734 | if (skb_rx_queue_recorded(skb)) { | |
1735 | u16 rx_queue = skb_get_rx_queue(skb); | |
1736 | ||
1737 | if (WARN_ON_ONCE(rx_queue == NO_QUEUE_MAPPING)) | |
1738 | return; | |
1739 | ||
1740 | sk->sk_rx_queue_mapping = rx_queue; | |
1741 | } | |
1742 | #endif | |
1743 | } | |
1744 | ||
1745 | static inline void sk_rx_queue_clear(struct sock *sk) | |
1746 | { | |
1747 | #ifdef CONFIG_XPS | |
1748 | sk->sk_rx_queue_mapping = NO_QUEUE_MAPPING; | |
1749 | #endif | |
1750 | } | |
1751 | ||
fc9bab24 AN |
1752 | #ifdef CONFIG_XPS |
1753 | static inline int sk_rx_queue_get(const struct sock *sk) | |
1754 | { | |
1755 | if (sk && sk->sk_rx_queue_mapping != NO_QUEUE_MAPPING) | |
1756 | return sk->sk_rx_queue_mapping; | |
1757 | ||
1758 | return -1; | |
1759 | } | |
1760 | #endif | |
1761 | ||
972692e0 DM |
1762 | static inline void sk_set_socket(struct sock *sk, struct socket *sock) |
1763 | { | |
e022f0b4 | 1764 | sk_tx_queue_clear(sk); |
972692e0 DM |
1765 | sk->sk_socket = sock; |
1766 | } | |
1767 | ||
aa395145 ED |
1768 | static inline wait_queue_head_t *sk_sleep(struct sock *sk) |
1769 | { | |
eaefd110 ED |
1770 | BUILD_BUG_ON(offsetof(struct socket_wq, wait) != 0); |
1771 | return &rcu_dereference_raw(sk->sk_wq)->wait; | |
aa395145 | 1772 | } |
1da177e4 LT |
1773 | /* Detach socket from process context. |
1774 | * Announce socket dead, detach it from wait queue and inode. | |
1775 | * Note that parent inode held reference count on this struct sock, | |
1776 | * we do not release it in this function, because protocol | |
1777 | * probably wants some additional cleanups or even continuing | |
1778 | * to work with this socket (TCP). | |
1779 | */ | |
1780 | static inline void sock_orphan(struct sock *sk) | |
1781 | { | |
1782 | write_lock_bh(&sk->sk_callback_lock); | |
1783 | sock_set_flag(sk, SOCK_DEAD); | |
972692e0 | 1784 | sk_set_socket(sk, NULL); |
43815482 | 1785 | sk->sk_wq = NULL; |
1da177e4 LT |
1786 | write_unlock_bh(&sk->sk_callback_lock); |
1787 | } | |
1788 | ||
1789 | static inline void sock_graft(struct sock *sk, struct socket *parent) | |
1790 | { | |
0ffdaf5b | 1791 | WARN_ON(parent->sk); |
1da177e4 | 1792 | write_lock_bh(&sk->sk_callback_lock); |
e6476c21 | 1793 | rcu_assign_pointer(sk->sk_wq, parent->wq); |
1da177e4 | 1794 | parent->sk = sk; |
972692e0 | 1795 | sk_set_socket(sk, parent); |
86741ec2 | 1796 | sk->sk_uid = SOCK_INODE(parent)->i_uid; |
4237c75c | 1797 | security_sock_graft(sk, parent); |
1da177e4 LT |
1798 | write_unlock_bh(&sk->sk_callback_lock); |
1799 | } | |
1800 | ||
69336bd2 JP |
1801 | kuid_t sock_i_uid(struct sock *sk); |
1802 | unsigned long sock_i_ino(struct sock *sk); | |
1da177e4 | 1803 | |
86741ec2 LC |
1804 | static inline kuid_t sock_net_uid(const struct net *net, const struct sock *sk) |
1805 | { | |
1806 | return sk ? sk->sk_uid : make_kuid(net->user_ns, 0); | |
1807 | } | |
1808 | ||
58d607d3 | 1809 | static inline u32 net_tx_rndhash(void) |
877d1f62 | 1810 | { |
58d607d3 ED |
1811 | u32 v = prandom_u32(); |
1812 | ||
1813 | return v ?: 1; | |
1814 | } | |
877d1f62 | 1815 | |
58d607d3 ED |
1816 | static inline void sk_set_txhash(struct sock *sk) |
1817 | { | |
1818 | sk->sk_txhash = net_tx_rndhash(); | |
877d1f62 TH |
1819 | } |
1820 | ||
265f94ff TH |
1821 | static inline void sk_rethink_txhash(struct sock *sk) |
1822 | { | |
1823 | if (sk->sk_txhash) | |
1824 | sk_set_txhash(sk); | |
1825 | } | |
1826 | ||
1da177e4 LT |
1827 | static inline struct dst_entry * |
1828 | __sk_dst_get(struct sock *sk) | |
1829 | { | |
1e1d04e6 HFS |
1830 | return rcu_dereference_check(sk->sk_dst_cache, |
1831 | lockdep_sock_is_held(sk)); | |
1da177e4 LT |
1832 | } |
1833 | ||
1834 | static inline struct dst_entry * | |
1835 | sk_dst_get(struct sock *sk) | |
1836 | { | |
1837 | struct dst_entry *dst; | |
1838 | ||
b6c6712a ED |
1839 | rcu_read_lock(); |
1840 | dst = rcu_dereference(sk->sk_dst_cache); | |
f8864972 ED |
1841 | if (dst && !atomic_inc_not_zero(&dst->__refcnt)) |
1842 | dst = NULL; | |
b6c6712a | 1843 | rcu_read_unlock(); |
1da177e4 LT |
1844 | return dst; |
1845 | } | |
1846 | ||
b6c6712a ED |
1847 | static inline void dst_negative_advice(struct sock *sk) |
1848 | { | |
1849 | struct dst_entry *ndst, *dst = __sk_dst_get(sk); | |
1850 | ||
265f94ff TH |
1851 | sk_rethink_txhash(sk); |
1852 | ||
b6c6712a ED |
1853 | if (dst && dst->ops->negative_advice) { |
1854 | ndst = dst->ops->negative_advice(dst); | |
1855 | ||
1856 | if (ndst != dst) { | |
1857 | rcu_assign_pointer(sk->sk_dst_cache, ndst); | |
0a6957e7 | 1858 | sk_tx_queue_clear(sk); |
9b8805a3 | 1859 | sk->sk_dst_pending_confirm = 0; |
b6c6712a ED |
1860 | } |
1861 | } | |
1862 | } | |
1863 | ||
1da177e4 LT |
1864 | static inline void |
1865 | __sk_dst_set(struct sock *sk, struct dst_entry *dst) | |
1866 | { | |
1867 | struct dst_entry *old_dst; | |
1868 | ||
e022f0b4 | 1869 | sk_tx_queue_clear(sk); |
9b8805a3 | 1870 | sk->sk_dst_pending_confirm = 0; |
95964c6d ED |
1871 | old_dst = rcu_dereference_protected(sk->sk_dst_cache, |
1872 | lockdep_sock_is_held(sk)); | |
b6c6712a | 1873 | rcu_assign_pointer(sk->sk_dst_cache, dst); |
1da177e4 LT |
1874 | dst_release(old_dst); |
1875 | } | |
1876 | ||
1877 | static inline void | |
1878 | sk_dst_set(struct sock *sk, struct dst_entry *dst) | |
1879 | { | |
7f502361 ED |
1880 | struct dst_entry *old_dst; |
1881 | ||
1882 | sk_tx_queue_clear(sk); | |
9b8805a3 | 1883 | sk->sk_dst_pending_confirm = 0; |
5925a055 | 1884 | old_dst = xchg((__force struct dst_entry **)&sk->sk_dst_cache, dst); |
7f502361 | 1885 | dst_release(old_dst); |
1da177e4 LT |
1886 | } |
1887 | ||
1888 | static inline void | |
1889 | __sk_dst_reset(struct sock *sk) | |
1890 | { | |
b6c6712a | 1891 | __sk_dst_set(sk, NULL); |
1da177e4 LT |
1892 | } |
1893 | ||
1894 | static inline void | |
1895 | sk_dst_reset(struct sock *sk) | |
1896 | { | |
7f502361 | 1897 | sk_dst_set(sk, NULL); |
1da177e4 LT |
1898 | } |
1899 | ||
69336bd2 | 1900 | struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie); |
1da177e4 | 1901 | |
69336bd2 | 1902 | struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie); |
1da177e4 | 1903 | |
9b8805a3 JA |
1904 | static inline void sk_dst_confirm(struct sock *sk) |
1905 | { | |
1906 | if (!sk->sk_dst_pending_confirm) | |
1907 | sk->sk_dst_pending_confirm = 1; | |
1908 | } | |
1909 | ||
4ff06203 JA |
1910 | static inline void sock_confirm_neigh(struct sk_buff *skb, struct neighbour *n) |
1911 | { | |
1912 | if (skb_get_dst_pending_confirm(skb)) { | |
1913 | struct sock *sk = skb->sk; | |
1914 | unsigned long now = jiffies; | |
1915 | ||
1916 | /* avoid dirtying neighbour */ | |
1917 | if (n->confirmed != now) | |
1918 | n->confirmed = now; | |
1919 | if (sk && sk->sk_dst_pending_confirm) | |
1920 | sk->sk_dst_pending_confirm = 0; | |
1921 | } | |
1922 | } | |
1923 | ||
f60e5990 | 1924 | bool sk_mc_loop(struct sock *sk); |
1925 | ||
dc6b9b78 | 1926 | static inline bool sk_can_gso(const struct sock *sk) |
bcd76111 HX |
1927 | { |
1928 | return net_gso_ok(sk->sk_route_caps, sk->sk_gso_type); | |
1929 | } | |
1930 | ||
69336bd2 | 1931 | void sk_setup_caps(struct sock *sk, struct dst_entry *dst); |
6cbb0df7 | 1932 | |
c8f44aff | 1933 | static inline void sk_nocaps_add(struct sock *sk, netdev_features_t flags) |
a465419b ED |
1934 | { |
1935 | sk->sk_route_nocaps |= flags; | |
1936 | sk->sk_route_caps &= ~flags; | |
1937 | } | |
1938 | ||
c6e1a0d1 | 1939 | static inline int skb_do_copy_data_nocache(struct sock *sk, struct sk_buff *skb, |
57be5bda | 1940 | struct iov_iter *from, char *to, |
912d398d | 1941 | int copy, int offset) |
c6e1a0d1 TH |
1942 | { |
1943 | if (skb->ip_summed == CHECKSUM_NONE) { | |
57be5bda | 1944 | __wsum csum = 0; |
15e6cb46 | 1945 | if (!csum_and_copy_from_iter_full(to, copy, &csum, from)) |
57be5bda | 1946 | return -EFAULT; |
912d398d | 1947 | skb->csum = csum_block_add(skb->csum, csum, offset); |
c6e1a0d1 | 1948 | } else if (sk->sk_route_caps & NETIF_F_NOCACHE_COPY) { |
15e6cb46 | 1949 | if (!copy_from_iter_full_nocache(to, copy, from)) |
c6e1a0d1 | 1950 | return -EFAULT; |
15e6cb46 | 1951 | } else if (!copy_from_iter_full(to, copy, from)) |
c6e1a0d1 TH |
1952 | return -EFAULT; |
1953 | ||
1954 | return 0; | |
1955 | } | |
1956 | ||
1957 | static inline int skb_add_data_nocache(struct sock *sk, struct sk_buff *skb, | |
57be5bda | 1958 | struct iov_iter *from, int copy) |
c6e1a0d1 | 1959 | { |
912d398d | 1960 | int err, offset = skb->len; |
c6e1a0d1 | 1961 | |
912d398d WY |
1962 | err = skb_do_copy_data_nocache(sk, skb, from, skb_put(skb, copy), |
1963 | copy, offset); | |
c6e1a0d1 | 1964 | if (err) |
912d398d | 1965 | __skb_trim(skb, offset); |
c6e1a0d1 TH |
1966 | |
1967 | return err; | |
1968 | } | |
1969 | ||
57be5bda | 1970 | static inline int skb_copy_to_page_nocache(struct sock *sk, struct iov_iter *from, |
c6e1a0d1 TH |
1971 | struct sk_buff *skb, |
1972 | struct page *page, | |
1973 | int off, int copy) | |
1974 | { | |
1975 | int err; | |
1976 | ||
912d398d WY |
1977 | err = skb_do_copy_data_nocache(sk, skb, from, page_address(page) + off, |
1978 | copy, skb->len); | |
c6e1a0d1 TH |
1979 | if (err) |
1980 | return err; | |
1981 | ||
1982 | skb->len += copy; | |
1983 | skb->data_len += copy; | |
1984 | skb->truesize += copy; | |
1985 | sk->sk_wmem_queued += copy; | |
1986 | sk_mem_charge(sk, copy); | |
1987 | return 0; | |
1988 | } | |
1989 | ||
c564039f ED |
1990 | /** |
1991 | * sk_wmem_alloc_get - returns write allocations | |
1992 | * @sk: socket | |
1993 | * | |
1994 | * Returns sk_wmem_alloc minus initial offset of one | |
1995 | */ | |
1996 | static inline int sk_wmem_alloc_get(const struct sock *sk) | |
1997 | { | |
14afee4b | 1998 | return refcount_read(&sk->sk_wmem_alloc) - 1; |
c564039f ED |
1999 | } |
2000 | ||
2001 | /** | |
2002 | * sk_rmem_alloc_get - returns read allocations | |
2003 | * @sk: socket | |
2004 | * | |
2005 | * Returns sk_rmem_alloc | |
2006 | */ | |
2007 | static inline int sk_rmem_alloc_get(const struct sock *sk) | |
2008 | { | |
2009 | return atomic_read(&sk->sk_rmem_alloc); | |
2010 | } | |
2011 | ||
2012 | /** | |
2013 | * sk_has_allocations - check if allocations are outstanding | |
2014 | * @sk: socket | |
2015 | * | |
2016 | * Returns true if socket has write or read allocations | |
2017 | */ | |
dc6b9b78 | 2018 | static inline bool sk_has_allocations(const struct sock *sk) |
c564039f ED |
2019 | { |
2020 | return sk_wmem_alloc_get(sk) || sk_rmem_alloc_get(sk); | |
2021 | } | |
2022 | ||
a57de0b4 | 2023 | /** |
1ce0bf50 | 2024 | * skwq_has_sleeper - check if there are any waiting processes |
acfbe96a | 2025 | * @wq: struct socket_wq |
a57de0b4 | 2026 | * |
43815482 | 2027 | * Returns true if socket_wq has waiting processes |
a57de0b4 | 2028 | * |
1ce0bf50 | 2029 | * The purpose of the skwq_has_sleeper and sock_poll_wait is to wrap the memory |
a57de0b4 JO |
2030 | * barrier call. They were added due to the race found within the tcp code. |
2031 | * | |
d651983d | 2032 | * Consider following tcp code paths:: |
a57de0b4 | 2033 | * |
d651983d MCC |
2034 | * CPU1 CPU2 |
2035 | * sys_select receive packet | |
a57de0b4 JO |
2036 | * ... ... |
2037 | * __add_wait_queue update tp->rcv_nxt | |
2038 | * ... ... | |
2039 | * tp->rcv_nxt check sock_def_readable | |
2040 | * ... { | |
43815482 ED |
2041 | * schedule rcu_read_lock(); |
2042 | * wq = rcu_dereference(sk->sk_wq); | |
2043 | * if (wq && waitqueue_active(&wq->wait)) | |
2044 | * wake_up_interruptible(&wq->wait) | |
a57de0b4 JO |
2045 | * ... |
2046 | * } | |
2047 | * | |
2048 | * The race for tcp fires when the __add_wait_queue changes done by CPU1 stay | |
2049 | * in its cache, and so does the tp->rcv_nxt update on CPU2 side. The CPU1 | |
2050 | * could then endup calling schedule and sleep forever if there are no more | |
2051 | * data on the socket. | |
ad462769 | 2052 | * |
a57de0b4 | 2053 | */ |
1ce0bf50 | 2054 | static inline bool skwq_has_sleeper(struct socket_wq *wq) |
a57de0b4 | 2055 | { |
1ce0bf50 | 2056 | return wq && wq_has_sleeper(&wq->wait); |
a57de0b4 JO |
2057 | } |
2058 | ||
2059 | /** | |
2060 | * sock_poll_wait - place memory barrier behind the poll_wait call. | |
2061 | * @filp: file | |
89ab066d | 2062 | * @sock: socket to wait on |
a57de0b4 JO |
2063 | * @p: poll_table |
2064 | * | |
43815482 | 2065 | * See the comments in the wq_has_sleeper function. |
89ab066d KG |
2066 | * |
2067 | * Do not derive sock from filp->private_data here. An SMC socket establishes | |
2068 | * an internal TCP socket that is used in the fallback case. All socket | |
2069 | * operations on the SMC socket are then forwarded to the TCP socket. In case of | |
2070 | * poll, the filp->private_data pointer references the SMC socket because the | |
2071 | * TCP socket has no file assigned. | |
a57de0b4 | 2072 | */ |
89ab066d KG |
2073 | static inline void sock_poll_wait(struct file *filp, struct socket *sock, |
2074 | poll_table *p) | |
a57de0b4 | 2075 | { |
d8bbd13b CH |
2076 | if (!poll_does_not_wait(p)) { |
2077 | poll_wait(filp, &sock->wq->wait, p); | |
dc6b9b78 | 2078 | /* We need to be sure we are in sync with the |
a57de0b4 JO |
2079 | * socket flags modification. |
2080 | * | |
43815482 | 2081 | * This memory barrier is paired in the wq_has_sleeper. |
dc6b9b78 | 2082 | */ |
a57de0b4 JO |
2083 | smp_mb(); |
2084 | } | |
2085 | } | |
2086 | ||
b73c3d0e TH |
2087 | static inline void skb_set_hash_from_sk(struct sk_buff *skb, struct sock *sk) |
2088 | { | |
2089 | if (sk->sk_txhash) { | |
2090 | skb->l4_hash = 1; | |
2091 | skb->hash = sk->sk_txhash; | |
2092 | } | |
2093 | } | |
2094 | ||
9e17f8a4 ED |
2095 | void skb_set_owner_w(struct sk_buff *skb, struct sock *sk); |
2096 | ||
1da177e4 | 2097 | /* |
dc6b9b78 | 2098 | * Queue a received datagram if it will fit. Stream and sequenced |
1da177e4 LT |
2099 | * protocols can't normally use this as they need to fit buffers in |
2100 | * and play with them. | |
2101 | * | |
dc6b9b78 | 2102 | * Inlined as it's very short and called for pretty much every |
1da177e4 LT |
2103 | * packet ever received. |
2104 | */ | |
1da177e4 LT |
2105 | static inline void skb_set_owner_r(struct sk_buff *skb, struct sock *sk) |
2106 | { | |
d55d87fd | 2107 | skb_orphan(skb); |
1da177e4 LT |
2108 | skb->sk = sk; |
2109 | skb->destructor = sock_rfree; | |
2110 | atomic_add(skb->truesize, &sk->sk_rmem_alloc); | |
3ab224be | 2111 | sk_mem_charge(sk, skb->truesize); |
1da177e4 LT |
2112 | } |
2113 | ||
69336bd2 JP |
2114 | void sk_reset_timer(struct sock *sk, struct timer_list *timer, |
2115 | unsigned long expires); | |
1da177e4 | 2116 | |
69336bd2 | 2117 | void sk_stop_timer(struct sock *sk, struct timer_list *timer); |
1da177e4 | 2118 | |
65101aec PA |
2119 | int __sk_queue_drop_skb(struct sock *sk, struct sk_buff_head *sk_queue, |
2120 | struct sk_buff *skb, unsigned int flags, | |
69629464 ED |
2121 | void (*destructor)(struct sock *sk, |
2122 | struct sk_buff *skb)); | |
e6afc8ac | 2123 | int __sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb); |
69336bd2 | 2124 | int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb); |
1da177e4 | 2125 | |
69336bd2 | 2126 | int sock_queue_err_skb(struct sock *sk, struct sk_buff *skb); |
364a9e93 | 2127 | struct sk_buff *sock_dequeue_err_skb(struct sock *sk); |
1da177e4 LT |
2128 | |
2129 | /* | |
2130 | * Recover an error report and clear atomically | |
2131 | */ | |
dc6b9b78 | 2132 | |
1da177e4 LT |
2133 | static inline int sock_error(struct sock *sk) |
2134 | { | |
c1cbe4b7 BL |
2135 | int err; |
2136 | if (likely(!sk->sk_err)) | |
2137 | return 0; | |
2138 | err = xchg(&sk->sk_err, 0); | |
1da177e4 LT |
2139 | return -err; |
2140 | } | |
2141 | ||
2142 | static inline unsigned long sock_wspace(struct sock *sk) | |
2143 | { | |
2144 | int amt = 0; | |
2145 | ||
2146 | if (!(sk->sk_shutdown & SEND_SHUTDOWN)) { | |
14afee4b | 2147 | amt = sk->sk_sndbuf - refcount_read(&sk->sk_wmem_alloc); |
dc6b9b78 | 2148 | if (amt < 0) |
1da177e4 LT |
2149 | amt = 0; |
2150 | } | |
2151 | return amt; | |
2152 | } | |
2153 | ||
ceb5d58b ED |
2154 | /* Note: |
2155 | * We use sk->sk_wq_raw, from contexts knowing this | |
2156 | * pointer is not NULL and cannot disappear/change. | |
2157 | */ | |
9cd3e072 | 2158 | static inline void sk_set_bit(int nr, struct sock *sk) |
1da177e4 | 2159 | { |
4be73522 ED |
2160 | if ((nr == SOCKWQ_ASYNC_NOSPACE || nr == SOCKWQ_ASYNC_WAITDATA) && |
2161 | !sock_flag(sk, SOCK_FASYNC)) | |
9317bb69 ED |
2162 | return; |
2163 | ||
ceb5d58b | 2164 | set_bit(nr, &sk->sk_wq_raw->flags); |
9cd3e072 ED |
2165 | } |
2166 | ||
2167 | static inline void sk_clear_bit(int nr, struct sock *sk) | |
2168 | { | |
4be73522 ED |
2169 | if ((nr == SOCKWQ_ASYNC_NOSPACE || nr == SOCKWQ_ASYNC_WAITDATA) && |
2170 | !sock_flag(sk, SOCK_FASYNC)) | |
9317bb69 ED |
2171 | return; |
2172 | ||
ceb5d58b | 2173 | clear_bit(nr, &sk->sk_wq_raw->flags); |
9cd3e072 ED |
2174 | } |
2175 | ||
ceb5d58b | 2176 | static inline void sk_wake_async(const struct sock *sk, int how, int band) |
1da177e4 | 2177 | { |
ceb5d58b ED |
2178 | if (sock_flag(sk, SOCK_FASYNC)) { |
2179 | rcu_read_lock(); | |
2180 | sock_wake_async(rcu_dereference(sk->sk_wq), how, band); | |
2181 | rcu_read_unlock(); | |
2182 | } | |
1da177e4 LT |
2183 | } |
2184 | ||
eea86af6 DB |
2185 | /* Since sk_{r,w}mem_alloc sums skb->truesize, even a small frame might |
2186 | * need sizeof(sk_buff) + MTU + padding, unless net driver perform copybreak. | |
2187 | * Note: for send buffers, TCP works better if we can build two skbs at | |
2188 | * minimum. | |
7a91b434 | 2189 | */ |
9eb5bf83 | 2190 | #define TCP_SKB_MIN_TRUESIZE (2048 + SKB_DATA_ALIGN(sizeof(struct sk_buff))) |
eea86af6 DB |
2191 | |
2192 | #define SOCK_MIN_SNDBUF (TCP_SKB_MIN_TRUESIZE * 2) | |
2193 | #define SOCK_MIN_RCVBUF TCP_SKB_MIN_TRUESIZE | |
1da177e4 LT |
2194 | |
2195 | static inline void sk_stream_moderate_sndbuf(struct sock *sk) | |
2196 | { | |
2197 | if (!(sk->sk_userlocks & SOCK_SNDBUF_LOCK)) { | |
8df09ea3 | 2198 | sk->sk_sndbuf = min(sk->sk_sndbuf, sk->sk_wmem_queued >> 1); |
eea86af6 | 2199 | sk->sk_sndbuf = max_t(u32, sk->sk_sndbuf, SOCK_MIN_SNDBUF); |
1da177e4 LT |
2200 | } |
2201 | } | |
2202 | ||
eb934478 ED |
2203 | struct sk_buff *sk_stream_alloc_skb(struct sock *sk, int size, gfp_t gfp, |
2204 | bool force_schedule); | |
1da177e4 | 2205 | |
5640f768 ED |
2206 | /** |
2207 | * sk_page_frag - return an appropriate page_frag | |
2208 | * @sk: socket | |
2209 | * | |
2210 | * If socket allocation mode allows current thread to sleep, it means its | |
2211 | * safe to use the per task page_frag instead of the per socket one. | |
2212 | */ | |
2213 | static inline struct page_frag *sk_page_frag(struct sock *sk) | |
1da177e4 | 2214 | { |
d0164adc | 2215 | if (gfpflags_allow_blocking(sk->sk_allocation)) |
5640f768 | 2216 | return ¤t->task_frag; |
1da177e4 | 2217 | |
5640f768 | 2218 | return &sk->sk_frag; |
1da177e4 LT |
2219 | } |
2220 | ||
69336bd2 | 2221 | bool sk_page_frag_refill(struct sock *sk, struct page_frag *pfrag); |
5640f768 | 2222 | |
1da177e4 LT |
2223 | /* |
2224 | * Default write policy as shown to user space via poll/select/SIGIO | |
2225 | */ | |
dc6b9b78 | 2226 | static inline bool sock_writeable(const struct sock *sk) |
1da177e4 | 2227 | { |
14afee4b | 2228 | return refcount_read(&sk->sk_wmem_alloc) < (sk->sk_sndbuf >> 1); |
1da177e4 LT |
2229 | } |
2230 | ||
dd0fc66f | 2231 | static inline gfp_t gfp_any(void) |
1da177e4 | 2232 | { |
99709372 | 2233 | return in_softirq() ? GFP_ATOMIC : GFP_KERNEL; |
1da177e4 LT |
2234 | } |
2235 | ||
dc6b9b78 | 2236 | static inline long sock_rcvtimeo(const struct sock *sk, bool noblock) |
1da177e4 LT |
2237 | { |
2238 | return noblock ? 0 : sk->sk_rcvtimeo; | |
2239 | } | |
2240 | ||
dc6b9b78 | 2241 | static inline long sock_sndtimeo(const struct sock *sk, bool noblock) |
1da177e4 LT |
2242 | { |
2243 | return noblock ? 0 : sk->sk_sndtimeo; | |
2244 | } | |
2245 | ||
2246 | static inline int sock_rcvlowat(const struct sock *sk, int waitall, int len) | |
2247 | { | |
2248 | return (waitall ? len : min_t(int, sk->sk_rcvlowat, len)) ? : 1; | |
2249 | } | |
2250 | ||
2251 | /* Alas, with timeout socket operations are not restartable. | |
2252 | * Compare this to poll(). | |
2253 | */ | |
2254 | static inline int sock_intr_errno(long timeo) | |
2255 | { | |
2256 | return timeo == MAX_SCHEDULE_TIMEOUT ? -ERESTARTSYS : -EINTR; | |
2257 | } | |
2258 | ||
744d5a3e EB |
2259 | struct sock_skb_cb { |
2260 | u32 dropcount; | |
2261 | }; | |
2262 | ||
2263 | /* Store sock_skb_cb at the end of skb->cb[] so protocol families | |
2264 | * using skb->cb[] would keep using it directly and utilize its | |
2265 | * alignement guarantee. | |
2266 | */ | |
2267 | #define SOCK_SKB_CB_OFFSET ((FIELD_SIZEOF(struct sk_buff, cb) - \ | |
2268 | sizeof(struct sock_skb_cb))) | |
2269 | ||
2270 | #define SOCK_SKB_CB(__skb) ((struct sock_skb_cb *)((__skb)->cb + \ | |
2271 | SOCK_SKB_CB_OFFSET)) | |
2272 | ||
b4772ef8 | 2273 | #define sock_skb_cb_check_size(size) \ |
744d5a3e | 2274 | BUILD_BUG_ON((size) > SOCK_SKB_CB_OFFSET) |
b4772ef8 | 2275 | |
3bc3b96f EB |
2276 | static inline void |
2277 | sock_skb_set_dropcount(const struct sock *sk, struct sk_buff *skb) | |
2278 | { | |
3665f381 ED |
2279 | SOCK_SKB_CB(skb)->dropcount = sock_flag(sk, SOCK_RXQ_OVFL) ? |
2280 | atomic_read(&sk->sk_drops) : 0; | |
3bc3b96f EB |
2281 | } |
2282 | ||
532182cd ED |
2283 | static inline void sk_drops_add(struct sock *sk, const struct sk_buff *skb) |
2284 | { | |
2285 | int segs = max_t(u16, 1, skb_shinfo(skb)->gso_segs); | |
2286 | ||
2287 | atomic_add(segs, &sk->sk_drops); | |
2288 | } | |
2289 | ||
69336bd2 JP |
2290 | void __sock_recv_timestamp(struct msghdr *msg, struct sock *sk, |
2291 | struct sk_buff *skb); | |
2292 | void __sock_recv_wifi_status(struct msghdr *msg, struct sock *sk, | |
2293 | struct sk_buff *skb); | |
92f37fd2 | 2294 | |
dc6b9b78 | 2295 | static inline void |
1da177e4 LT |
2296 | sock_recv_timestamp(struct msghdr *msg, struct sock *sk, struct sk_buff *skb) |
2297 | { | |
b7aa0bf7 | 2298 | ktime_t kt = skb->tstamp; |
20d49473 | 2299 | struct skb_shared_hwtstamps *hwtstamps = skb_hwtstamps(skb); |
a61bbcf2 | 2300 | |
20d49473 PO |
2301 | /* |
2302 | * generate control messages if | |
b9f40e21 | 2303 | * - receive time stamping in software requested |
20d49473 | 2304 | * - software time stamp available and wanted |
20d49473 | 2305 | * - hardware time stamps available and wanted |
20d49473 PO |
2306 | */ |
2307 | if (sock_flag(sk, SOCK_RCVTSTAMP) || | |
b9f40e21 | 2308 | (sk->sk_tsflags & SOF_TIMESTAMPING_RX_SOFTWARE) || |
2456e855 TG |
2309 | (kt && sk->sk_tsflags & SOF_TIMESTAMPING_SOFTWARE) || |
2310 | (hwtstamps->hwtstamp && | |
b9f40e21 | 2311 | (sk->sk_tsflags & SOF_TIMESTAMPING_RAW_HARDWARE))) |
92f37fd2 ED |
2312 | __sock_recv_timestamp(msg, sk, skb); |
2313 | else | |
b7aa0bf7 | 2314 | sk->sk_stamp = kt; |
6e3e939f JB |
2315 | |
2316 | if (sock_flag(sk, SOCK_WIFI_STATUS) && skb->wifi_acked_valid) | |
2317 | __sock_recv_wifi_status(msg, sk, skb); | |
1da177e4 LT |
2318 | } |
2319 | ||
69336bd2 JP |
2320 | void __sock_recv_ts_and_drops(struct msghdr *msg, struct sock *sk, |
2321 | struct sk_buff *skb); | |
767dd033 | 2322 | |
6c7c98ba | 2323 | #define SK_DEFAULT_STAMP (-1L * NSEC_PER_SEC) |
767dd033 ED |
2324 | static inline void sock_recv_ts_and_drops(struct msghdr *msg, struct sock *sk, |
2325 | struct sk_buff *skb) | |
2326 | { | |
2327 | #define FLAGS_TS_OR_DROPS ((1UL << SOCK_RXQ_OVFL) | \ | |
b9f40e21 WB |
2328 | (1UL << SOCK_RCVTSTAMP)) |
2329 | #define TSFLAGS_ANY (SOF_TIMESTAMPING_SOFTWARE | \ | |
2330 | SOF_TIMESTAMPING_RAW_HARDWARE) | |
767dd033 | 2331 | |
b9f40e21 | 2332 | if (sk->sk_flags & FLAGS_TS_OR_DROPS || sk->sk_tsflags & TSFLAGS_ANY) |
767dd033 | 2333 | __sock_recv_ts_and_drops(msg, sk, skb); |
d3fbff30 | 2334 | else if (unlikely(sock_flag(sk, SOCK_TIMESTAMP))) |
767dd033 | 2335 | sk->sk_stamp = skb->tstamp; |
6c7c98ba PA |
2336 | else if (unlikely(sk->sk_stamp == SK_DEFAULT_STAMP)) |
2337 | sk->sk_stamp = 0; | |
767dd033 | 2338 | } |
3b885787 | 2339 | |
c14ac945 | 2340 | void __sock_tx_timestamp(__u16 tsflags, __u8 *tx_flags); |
67cc0d40 | 2341 | |
20d49473 PO |
2342 | /** |
2343 | * sock_tx_timestamp - checks whether the outgoing packet is to be time stamped | |
20d49473 | 2344 | * @sk: socket sending this packet |
c14ac945 | 2345 | * @tsflags: timestamping flags to use |
140c55d4 ED |
2346 | * @tx_flags: completed with instructions for time stamping |
2347 | * | |
d651983d | 2348 | * Note: callers should take care of initial ``*tx_flags`` value (usually 0) |
20d49473 | 2349 | */ |
c14ac945 SHY |
2350 | static inline void sock_tx_timestamp(const struct sock *sk, __u16 tsflags, |
2351 | __u8 *tx_flags) | |
67cc0d40 | 2352 | { |
c14ac945 SHY |
2353 | if (unlikely(tsflags)) |
2354 | __sock_tx_timestamp(tsflags, tx_flags); | |
67cc0d40 WB |
2355 | if (unlikely(sock_flag(sk, SOCK_WIFI_STATUS))) |
2356 | *tx_flags |= SKBTX_WIFI_STATUS; | |
2357 | } | |
20d49473 | 2358 | |
1da177e4 LT |
2359 | /** |
2360 | * sk_eat_skb - Release a skb if it is no longer needed | |
4dc3b16b PP |
2361 | * @sk: socket to eat this skb from |
2362 | * @skb: socket buffer to eat | |
1da177e4 LT |
2363 | * |
2364 | * This routine must be called with interrupts disabled or with the socket | |
2365 | * locked so that the sk_buff queue operation is ok. | |
2366 | */ | |
7bced397 | 2367 | static inline void sk_eat_skb(struct sock *sk, struct sk_buff *skb) |
1da177e4 LT |
2368 | { |
2369 | __skb_unlink(skb, &sk->sk_receive_queue); | |
2370 | __kfree_skb(skb); | |
2371 | } | |
2372 | ||
3b1e0a65 YH |
2373 | static inline |
2374 | struct net *sock_net(const struct sock *sk) | |
2375 | { | |
c2d9ba9b | 2376 | return read_pnet(&sk->sk_net); |
3b1e0a65 YH |
2377 | } |
2378 | ||
2379 | static inline | |
f5aa23fd | 2380 | void sock_net_set(struct sock *sk, struct net *net) |
3b1e0a65 | 2381 | { |
c2d9ba9b | 2382 | write_pnet(&sk->sk_net, net); |
3b1e0a65 YH |
2383 | } |
2384 | ||
23542618 KK |
2385 | static inline struct sock *skb_steal_sock(struct sk_buff *skb) |
2386 | { | |
efc27f8c | 2387 | if (skb->sk) { |
23542618 KK |
2388 | struct sock *sk = skb->sk; |
2389 | ||
2390 | skb->destructor = NULL; | |
2391 | skb->sk = NULL; | |
2392 | return sk; | |
2393 | } | |
2394 | return NULL; | |
2395 | } | |
2396 | ||
1d0ab253 ED |
2397 | /* This helper checks if a socket is a full socket, |
2398 | * ie _not_ a timewait or request socket. | |
2399 | */ | |
2400 | static inline bool sk_fullsock(const struct sock *sk) | |
2401 | { | |
2402 | return (1 << sk->sk_state) & ~(TCPF_TIME_WAIT | TCPF_NEW_SYN_RECV); | |
2403 | } | |
2404 | ||
ebf4e808 IL |
2405 | /* Checks if this SKB belongs to an HW offloaded socket |
2406 | * and whether any SW fallbacks are required based on dev. | |
2407 | */ | |
2408 | static inline struct sk_buff *sk_validate_xmit_skb(struct sk_buff *skb, | |
2409 | struct net_device *dev) | |
2410 | { | |
2411 | #ifdef CONFIG_SOCK_VALIDATE_XMIT | |
2412 | struct sock *sk = skb->sk; | |
2413 | ||
2414 | if (sk && sk_fullsock(sk) && sk->sk_validate_xmit_skb) | |
2415 | skb = sk->sk_validate_xmit_skb(sk, dev, skb); | |
2416 | #endif | |
2417 | ||
2418 | return skb; | |
2419 | } | |
2420 | ||
e446f9df ED |
2421 | /* This helper checks if a socket is a LISTEN or NEW_SYN_RECV |
2422 | * SYNACK messages can be attached to either ones (depending on SYNCOOKIE) | |
2423 | */ | |
2424 | static inline bool sk_listener(const struct sock *sk) | |
2425 | { | |
2426 | return (1 << sk->sk_state) & (TCPF_LISTEN | TCPF_NEW_SYN_RECV); | |
2427 | } | |
2428 | ||
69336bd2 JP |
2429 | void sock_enable_timestamp(struct sock *sk, int flag); |
2430 | int sock_get_timestamp(struct sock *, struct timeval __user *); | |
2431 | int sock_get_timestampns(struct sock *, struct timespec __user *); | |
2432 | int sock_recv_errqueue(struct sock *sk, struct msghdr *msg, int len, int level, | |
2433 | int type); | |
1da177e4 | 2434 | |
a3b299da EB |
2435 | bool sk_ns_capable(const struct sock *sk, |
2436 | struct user_namespace *user_ns, int cap); | |
2437 | bool sk_capable(const struct sock *sk, int cap); | |
2438 | bool sk_net_capable(const struct sock *sk, int cap); | |
2439 | ||
a2d133b1 JH |
2440 | void sk_get_meminfo(const struct sock *sk, u32 *meminfo); |
2441 | ||
eaa72dc4 ED |
2442 | /* Take into consideration the size of the struct sk_buff overhead in the |
2443 | * determination of these values, since that is non-constant across | |
2444 | * platforms. This makes socket queueing behavior and performance | |
2445 | * not depend upon such differences. | |
2446 | */ | |
2447 | #define _SK_MEM_PACKETS 256 | |
2448 | #define _SK_MEM_OVERHEAD SKB_TRUESIZE(256) | |
2449 | #define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS) | |
2450 | #define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS) | |
2451 | ||
1da177e4 LT |
2452 | extern __u32 sysctl_wmem_max; |
2453 | extern __u32 sysctl_rmem_max; | |
2454 | ||
b245be1f | 2455 | extern int sysctl_tstamp_allow_data; |
6baf1f41 DM |
2456 | extern int sysctl_optmem_max; |
2457 | ||
20380731 ACM |
2458 | extern __u32 sysctl_wmem_default; |
2459 | extern __u32 sysctl_rmem_default; | |
20380731 | 2460 | |
a3dcaf17 ED |
2461 | static inline int sk_get_wmem0(const struct sock *sk, const struct proto *proto) |
2462 | { | |
2463 | /* Does this proto have per netns sysctl_wmem ? */ | |
2464 | if (proto->sysctl_wmem_offset) | |
2465 | return *(int *)((void *)sock_net(sk) + proto->sysctl_wmem_offset); | |
2466 | ||
2467 | return *proto->sysctl_wmem; | |
2468 | } | |
2469 | ||
2470 | static inline int sk_get_rmem0(const struct sock *sk, const struct proto *proto) | |
2471 | { | |
2472 | /* Does this proto have per netns sysctl_rmem ? */ | |
2473 | if (proto->sysctl_rmem_offset) | |
2474 | return *(int *)((void *)sock_net(sk) + proto->sysctl_rmem_offset); | |
2475 | ||
2476 | return *proto->sysctl_rmem; | |
2477 | } | |
2478 | ||
c9f1f58d ED |
2479 | /* Default TCP Small queue budget is ~1 ms of data (1sec >> 10) |
2480 | * Some wifi drivers need to tweak it to get more chunks. | |
2481 | * They can use this helper from their ndo_start_xmit() | |
2482 | */ | |
2483 | static inline void sk_pacing_shift_update(struct sock *sk, int val) | |
2484 | { | |
2485 | if (!sk || !sk_fullsock(sk) || sk->sk_pacing_shift == val) | |
2486 | return; | |
2487 | sk->sk_pacing_shift = val; | |
2488 | } | |
2489 | ||
54dc3e33 DA |
2490 | /* if a socket is bound to a device, check that the given device |
2491 | * index is either the same or that the socket is bound to an L3 | |
2492 | * master device and the given device index is also enslaved to | |
2493 | * that L3 master | |
2494 | */ | |
2495 | static inline bool sk_dev_equal_l3scope(struct sock *sk, int dif) | |
2496 | { | |
2497 | int mdif; | |
2498 | ||
2499 | if (!sk->sk_bound_dev_if || sk->sk_bound_dev_if == dif) | |
2500 | return true; | |
2501 | ||
2502 | mdif = l3mdev_master_ifindex_by_index(sock_net(sk), dif); | |
2503 | if (mdif && mdif == sk->sk_bound_dev_if) | |
2504 | return true; | |
2505 | ||
2506 | return false; | |
2507 | } | |
2508 | ||
1da177e4 | 2509 | #endif /* _SOCK_H */ |