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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 | |
8e5eb54d ED |
142 | * @skc_flags: place holder for sk_flags |
143 | * %SO_LINGER (l_onoff), %SO_BROADCAST, %SO_KEEPALIVE, | |
144 | * %SO_OOBINLINE settings, %SO_TIMESTAMPING settings | |
70da268b | 145 | * @skc_incoming_cpu: record/match cpu processing incoming packets |
68835aba | 146 | * @skc_refcnt: reference count |
4dc3b16b PP |
147 | * |
148 | * This is the minimal network layer representation of sockets, the header | |
8feaf0c0 ACM |
149 | * for struct sock and struct inet_timewait_sock. |
150 | */ | |
1da177e4 | 151 | struct sock_common { |
ce43b03e | 152 | /* skc_daddr and skc_rcv_saddr must be grouped on a 8 bytes aligned |
05dbc7b5 | 153 | * address on 64bit arches : cf INET_MATCH() |
4dc6dc71 | 154 | */ |
ce43b03e | 155 | union { |
077b393d | 156 | __addrpair skc_addrpair; |
ce43b03e ED |
157 | struct { |
158 | __be32 skc_daddr; | |
159 | __be32 skc_rcv_saddr; | |
160 | }; | |
161 | }; | |
d4cada4a ED |
162 | union { |
163 | unsigned int skc_hash; | |
164 | __u16 skc_u16hashes[2]; | |
165 | }; | |
ce43b03e ED |
166 | /* skc_dport && skc_num must be grouped as well */ |
167 | union { | |
077b393d | 168 | __portpair skc_portpair; |
ce43b03e ED |
169 | struct { |
170 | __be16 skc_dport; | |
171 | __u16 skc_num; | |
172 | }; | |
173 | }; | |
174 | ||
4dc6dc71 ED |
175 | unsigned short skc_family; |
176 | volatile unsigned char skc_state; | |
055dc21a | 177 | unsigned char skc_reuse:4; |
9fe516ba ED |
178 | unsigned char skc_reuseport:1; |
179 | unsigned char skc_ipv6only:1; | |
26abe143 | 180 | unsigned char skc_net_refcnt:1; |
4dc6dc71 | 181 | int skc_bound_dev_if; |
512615b6 ED |
182 | union { |
183 | struct hlist_node skc_bind_node; | |
ca065d0c | 184 | struct hlist_node skc_portaddr_node; |
512615b6 | 185 | }; |
8feaf0c0 | 186 | struct proto *skc_prot; |
0c5c9fb5 | 187 | possible_net_t skc_net; |
efe4208f ED |
188 | |
189 | #if IS_ENABLED(CONFIG_IPV6) | |
190 | struct in6_addr skc_v6_daddr; | |
191 | struct in6_addr skc_v6_rcv_saddr; | |
192 | #endif | |
193 | ||
33cf7c90 ED |
194 | atomic64_t skc_cookie; |
195 | ||
8e5eb54d ED |
196 | /* following fields are padding to force |
197 | * offset(struct sock, sk_refcnt) == 128 on 64bit arches | |
198 | * assuming IPV6 is enabled. We use this padding differently | |
199 | * for different kind of 'sockets' | |
200 | */ | |
201 | union { | |
202 | unsigned long skc_flags; | |
203 | struct sock *skc_listener; /* request_sock */ | |
204 | struct inet_timewait_death_row *skc_tw_dr; /* inet_timewait_sock */ | |
205 | }; | |
68835aba ED |
206 | /* |
207 | * fields between dontcopy_begin/dontcopy_end | |
208 | * are not copied in sock_copy() | |
209 | */ | |
928c41e7 | 210 | /* private: */ |
68835aba | 211 | int skc_dontcopy_begin[0]; |
928c41e7 | 212 | /* public: */ |
68835aba ED |
213 | union { |
214 | struct hlist_node skc_node; | |
215 | struct hlist_nulls_node skc_nulls_node; | |
216 | }; | |
755c31cd | 217 | unsigned short skc_tx_queue_mapping; |
ed53d0ab ED |
218 | union { |
219 | int skc_incoming_cpu; | |
220 | u32 skc_rcv_wnd; | |
d475f090 | 221 | u32 skc_tw_rcv_nxt; /* struct tcp_timewait_sock */ |
ed53d0ab | 222 | }; |
70da268b | 223 | |
41c6d650 | 224 | refcount_t skc_refcnt; |
928c41e7 | 225 | /* private: */ |
68835aba | 226 | int skc_dontcopy_end[0]; |
ed53d0ab ED |
227 | union { |
228 | u32 skc_rxhash; | |
229 | u32 skc_window_clamp; | |
d475f090 | 230 | u32 skc_tw_snd_nxt; /* struct tcp_timewait_sock */ |
ed53d0ab | 231 | }; |
928c41e7 | 232 | /* public: */ |
1da177e4 LT |
233 | }; |
234 | ||
235 | /** | |
236 | * struct sock - network layer representation of sockets | |
8feaf0c0 | 237 | * @__sk_common: shared layout with inet_timewait_sock |
4dc3b16b PP |
238 | * @sk_shutdown: mask of %SEND_SHUTDOWN and/or %RCV_SHUTDOWN |
239 | * @sk_userlocks: %SO_SNDBUF and %SO_RCVBUF settings | |
240 | * @sk_lock: synchronizer | |
cdfbabfb | 241 | * @sk_kern_sock: True if sock is using kernel lock classes |
4dc3b16b | 242 | * @sk_rcvbuf: size of receive buffer in bytes |
43815482 | 243 | * @sk_wq: sock wait queue and async head |
421b3885 | 244 | * @sk_rx_dst: receive input route used by early demux |
4dc3b16b | 245 | * @sk_dst_cache: destination cache |
9b8805a3 | 246 | * @sk_dst_pending_confirm: need to confirm neighbour |
4dc3b16b | 247 | * @sk_policy: flow policy |
4dc3b16b PP |
248 | * @sk_receive_queue: incoming packets |
249 | * @sk_wmem_alloc: transmit queue bytes committed | |
771edcaf | 250 | * @sk_tsq_flags: TCP Small Queues flags |
4dc3b16b PP |
251 | * @sk_write_queue: Packet sending queue |
252 | * @sk_omem_alloc: "o" is "option" or "other" | |
253 | * @sk_wmem_queued: persistent queue size | |
254 | * @sk_forward_alloc: space allocated forward | |
06021292 | 255 | * @sk_napi_id: id of the last napi context to receive data for sk |
dafcc438 | 256 | * @sk_ll_usec: usecs to busypoll when there is no data |
4dc3b16b | 257 | * @sk_allocation: allocation mode |
95bd09eb | 258 | * @sk_pacing_rate: Pacing rate (if supported by transport/packet scheduler) |
218af599 | 259 | * @sk_pacing_status: Pacing status (requested, handled by sch_fq) |
c3f40d7c | 260 | * @sk_max_pacing_rate: Maximum pacing rate (%SO_MAX_PACING_RATE) |
4dc3b16b | 261 | * @sk_sndbuf: size of send buffer in bytes |
771edcaf | 262 | * @__sk_flags_offset: empty field used to determine location of bitfield |
293de7de | 263 | * @sk_padding: unused element for alignment |
28448b80 TH |
264 | * @sk_no_check_tx: %SO_NO_CHECK setting, set checksum in TX packets |
265 | * @sk_no_check_rx: allow zero checksum in RX packets | |
4dc3b16b | 266 | * @sk_route_caps: route capabilities (e.g. %NETIF_F_TSO) |
a465419b | 267 | * @sk_route_nocaps: forbidden route capabilities (e.g NETIF_F_GSO_MASK) |
bcd76111 | 268 | * @sk_gso_type: GSO type (e.g. %SKB_GSO_TCPV4) |
82cc1a7a | 269 | * @sk_gso_max_size: Maximum GSO segment size to build |
1485348d | 270 | * @sk_gso_max_segs: Maximum number of GSO segments |
3a9b76fd | 271 | * @sk_pacing_shift: scaling factor for TCP Small Queues |
4dc3b16b | 272 | * @sk_lingertime: %SO_LINGER l_linger setting |
4dc3b16b PP |
273 | * @sk_backlog: always used with the per-socket spinlock held |
274 | * @sk_callback_lock: used with the callbacks in the end of this struct | |
275 | * @sk_error_queue: rarely used | |
33c732c3 WC |
276 | * @sk_prot_creator: sk_prot of original sock creator (see ipv6_setsockopt, |
277 | * IPV6_ADDRFORM for instance) | |
4dc3b16b | 278 | * @sk_err: last error |
33c732c3 WC |
279 | * @sk_err_soft: errors that don't cause failure but are the cause of a |
280 | * persistent failure not just 'timed out' | |
cb61cb9b | 281 | * @sk_drops: raw/udp drops counter |
4dc3b16b PP |
282 | * @sk_ack_backlog: current listen backlog |
283 | * @sk_max_ack_backlog: listen backlog set in listen() | |
771edcaf | 284 | * @sk_uid: user id of owner |
4dc3b16b PP |
285 | * @sk_priority: %SO_PRIORITY setting |
286 | * @sk_type: socket type (%SOCK_STREAM, etc) | |
287 | * @sk_protocol: which protocol this socket belongs in this network family | |
53c3fa20 RD |
288 | * @sk_peer_pid: &struct pid for this socket's peer |
289 | * @sk_peer_cred: %SO_PEERCRED setting | |
4dc3b16b PP |
290 | * @sk_rcvlowat: %SO_RCVLOWAT setting |
291 | * @sk_rcvtimeo: %SO_RCVTIMEO setting | |
292 | * @sk_sndtimeo: %SO_SNDTIMEO setting | |
b73c3d0e | 293 | * @sk_txhash: computed flow hash for use on transmit |
4dc3b16b | 294 | * @sk_filter: socket filtering instructions |
4dc3b16b PP |
295 | * @sk_timer: sock cleanup timer |
296 | * @sk_stamp: time stamp of last packet received | |
b9f40e21 | 297 | * @sk_tsflags: SO_TIMESTAMPING socket options |
09c2d251 | 298 | * @sk_tskey: counter to disambiguate concurrent tstamp requests |
52267790 | 299 | * @sk_zckey: counter to order MSG_ZEROCOPY notifications |
4dc3b16b PP |
300 | * @sk_socket: Identd and reporting IO signals |
301 | * @sk_user_data: RPC layer private data | |
5640f768 | 302 | * @sk_frag: cached page frag |
d3d4f0a0 | 303 | * @sk_peek_off: current peek_offset value |
4dc3b16b | 304 | * @sk_send_head: front of stuff to transmit |
67be2dd1 | 305 | * @sk_security: used by security modules |
31729363 | 306 | * @sk_mark: generic packet mark |
2a56a1fe | 307 | * @sk_cgrp_data: cgroup data for this cgroup |
baac50bb | 308 | * @sk_memcg: this socket's memory cgroup association |
4dc3b16b PP |
309 | * @sk_write_pending: a write to stream socket waits to start |
310 | * @sk_state_change: callback to indicate change in the state of the sock | |
311 | * @sk_data_ready: callback to indicate there is data to be processed | |
312 | * @sk_write_space: callback to indicate there is bf sending space available | |
313 | * @sk_error_report: callback to indicate errors (e.g. %MSG_ERRQUEUE) | |
314 | * @sk_backlog_rcv: callback to process the backlog | |
315 | * @sk_destruct: called at sock freeing time, i.e. when all refcnt == 0 | |
ef456144 | 316 | * @sk_reuseport_cb: reuseport group container |
293de7de SH |
317 | * @sk_rcu: used during RCU grace period |
318 | */ | |
1da177e4 LT |
319 | struct sock { |
320 | /* | |
8feaf0c0 | 321 | * Now struct inet_timewait_sock also uses sock_common, so please just |
1da177e4 LT |
322 | * don't add nothing before this first member (__sk_common) --acme |
323 | */ | |
324 | struct sock_common __sk_common; | |
4dc6dc71 ED |
325 | #define sk_node __sk_common.skc_node |
326 | #define sk_nulls_node __sk_common.skc_nulls_node | |
327 | #define sk_refcnt __sk_common.skc_refcnt | |
e022f0b4 | 328 | #define sk_tx_queue_mapping __sk_common.skc_tx_queue_mapping |
4dc6dc71 | 329 | |
68835aba ED |
330 | #define sk_dontcopy_begin __sk_common.skc_dontcopy_begin |
331 | #define sk_dontcopy_end __sk_common.skc_dontcopy_end | |
4dc6dc71 | 332 | #define sk_hash __sk_common.skc_hash |
50805466 | 333 | #define sk_portpair __sk_common.skc_portpair |
05dbc7b5 ED |
334 | #define sk_num __sk_common.skc_num |
335 | #define sk_dport __sk_common.skc_dport | |
50805466 ED |
336 | #define sk_addrpair __sk_common.skc_addrpair |
337 | #define sk_daddr __sk_common.skc_daddr | |
338 | #define sk_rcv_saddr __sk_common.skc_rcv_saddr | |
1da177e4 LT |
339 | #define sk_family __sk_common.skc_family |
340 | #define sk_state __sk_common.skc_state | |
341 | #define sk_reuse __sk_common.skc_reuse | |
055dc21a | 342 | #define sk_reuseport __sk_common.skc_reuseport |
9fe516ba | 343 | #define sk_ipv6only __sk_common.skc_ipv6only |
26abe143 | 344 | #define sk_net_refcnt __sk_common.skc_net_refcnt |
1da177e4 | 345 | #define sk_bound_dev_if __sk_common.skc_bound_dev_if |
1da177e4 | 346 | #define sk_bind_node __sk_common.skc_bind_node |
8feaf0c0 | 347 | #define sk_prot __sk_common.skc_prot |
07feaebf | 348 | #define sk_net __sk_common.skc_net |
efe4208f ED |
349 | #define sk_v6_daddr __sk_common.skc_v6_daddr |
350 | #define sk_v6_rcv_saddr __sk_common.skc_v6_rcv_saddr | |
33cf7c90 | 351 | #define sk_cookie __sk_common.skc_cookie |
70da268b | 352 | #define sk_incoming_cpu __sk_common.skc_incoming_cpu |
8e5eb54d | 353 | #define sk_flags __sk_common.skc_flags |
ed53d0ab | 354 | #define sk_rxhash __sk_common.skc_rxhash |
efe4208f | 355 | |
1da177e4 | 356 | socket_lock_t sk_lock; |
9115e8cd ED |
357 | atomic_t sk_drops; |
358 | int sk_rcvlowat; | |
359 | struct sk_buff_head sk_error_queue; | |
b178bb3d | 360 | struct sk_buff_head sk_receive_queue; |
fa438ccf ED |
361 | /* |
362 | * The backlog queue is special, it is always used with | |
363 | * the per-socket spinlock held and requires low latency | |
364 | * access. Therefore we special case it's implementation. | |
b178bb3d ED |
365 | * Note : rmem_alloc is in this structure to fill a hole |
366 | * on 64bit arches, not because its logically part of | |
367 | * backlog. | |
fa438ccf ED |
368 | */ |
369 | struct { | |
b178bb3d ED |
370 | atomic_t rmem_alloc; |
371 | int len; | |
372 | struct sk_buff *head; | |
373 | struct sk_buff *tail; | |
fa438ccf | 374 | } sk_backlog; |
b178bb3d | 375 | #define sk_rmem_alloc sk_backlog.rmem_alloc |
2c8c56e1 | 376 | |
9115e8cd | 377 | int sk_forward_alloc; |
e0d1095a | 378 | #ifdef CONFIG_NET_RX_BUSY_POLL |
dafcc438 | 379 | unsigned int sk_ll_usec; |
9115e8cd ED |
380 | /* ===== mostly read cache line ===== */ |
381 | unsigned int sk_napi_id; | |
b178bb3d | 382 | #endif |
b178bb3d ED |
383 | int sk_rcvbuf; |
384 | ||
385 | struct sk_filter __rcu *sk_filter; | |
ceb5d58b ED |
386 | union { |
387 | struct socket_wq __rcu *sk_wq; | |
388 | struct socket_wq *sk_wq_raw; | |
389 | }; | |
def8b4fa | 390 | #ifdef CONFIG_XFRM |
d188ba86 | 391 | struct xfrm_policy __rcu *sk_policy[2]; |
def8b4fa | 392 | #endif |
deaa5854 | 393 | struct dst_entry *sk_rx_dst; |
0e36cbb3 | 394 | struct dst_entry __rcu *sk_dst_cache; |
1da177e4 | 395 | atomic_t sk_omem_alloc; |
4e07a91c | 396 | int sk_sndbuf; |
9115e8cd ED |
397 | |
398 | /* ===== cache line for TX ===== */ | |
399 | int sk_wmem_queued; | |
14afee4b | 400 | refcount_t sk_wmem_alloc; |
9115e8cd | 401 | unsigned long sk_tsq_flags; |
75c119af ED |
402 | union { |
403 | struct sk_buff *sk_send_head; | |
404 | struct rb_root tcp_rtx_queue; | |
405 | }; | |
1da177e4 | 406 | struct sk_buff_head sk_write_queue; |
9115e8cd ED |
407 | __s32 sk_peek_off; |
408 | int sk_write_pending; | |
9b8805a3 | 409 | __u32 sk_dst_pending_confirm; |
218af599 | 410 | u32 sk_pacing_status; /* see enum sk_pacing */ |
9115e8cd ED |
411 | long sk_sndtimeo; |
412 | struct timer_list sk_timer; | |
413 | __u32 sk_priority; | |
414 | __u32 sk_mark; | |
415 | u32 sk_pacing_rate; /* bytes per second */ | |
416 | u32 sk_max_pacing_rate; | |
417 | struct page_frag sk_frag; | |
418 | netdev_features_t sk_route_caps; | |
419 | netdev_features_t sk_route_nocaps; | |
0a6b2a1d | 420 | netdev_features_t sk_route_forced_caps; |
9115e8cd ED |
421 | int sk_gso_type; |
422 | unsigned int sk_gso_max_size; | |
423 | gfp_t sk_allocation; | |
424 | __u32 sk_txhash; | |
fc64869c AR |
425 | |
426 | /* | |
427 | * Because of non atomicity rules, all | |
428 | * changes are protected by socket lock. | |
429 | */ | |
aa4c1037 DA |
430 | unsigned int __sk_flags_offset[0]; |
431 | #ifdef __BIG_ENDIAN_BITFIELD | |
432 | #define SK_FL_PROTO_SHIFT 16 | |
433 | #define SK_FL_PROTO_MASK 0x00ff0000 | |
434 | ||
435 | #define SK_FL_TYPE_SHIFT 0 | |
436 | #define SK_FL_TYPE_MASK 0x0000ffff | |
437 | #else | |
438 | #define SK_FL_PROTO_SHIFT 8 | |
439 | #define SK_FL_PROTO_MASK 0x0000ff00 | |
440 | ||
441 | #define SK_FL_TYPE_SHIFT 16 | |
442 | #define SK_FL_TYPE_MASK 0xffff0000 | |
443 | #endif | |
444 | ||
cdfbabfb DH |
445 | unsigned int sk_padding : 1, |
446 | sk_kern_sock : 1, | |
28448b80 TH |
447 | sk_no_check_tx : 1, |
448 | sk_no_check_rx : 1, | |
b178bb3d ED |
449 | sk_userlocks : 4, |
450 | sk_protocol : 8, | |
451 | sk_type : 16; | |
7bbadd2d | 452 | #define SK_PROTOCOL_MAX U8_MAX |
1485348d | 453 | u16 sk_gso_max_segs; |
3a9b76fd | 454 | u8 sk_pacing_shift; |
1da177e4 | 455 | unsigned long sk_lingertime; |
476e19cf | 456 | struct proto *sk_prot_creator; |
1da177e4 LT |
457 | rwlock_t sk_callback_lock; |
458 | int sk_err, | |
459 | sk_err_soft; | |
becb74f0 ED |
460 | u32 sk_ack_backlog; |
461 | u32 sk_max_ack_backlog; | |
86741ec2 | 462 | kuid_t sk_uid; |
109f6e39 EB |
463 | struct pid *sk_peer_pid; |
464 | const struct cred *sk_peer_cred; | |
1da177e4 | 465 | long sk_rcvtimeo; |
b7aa0bf7 | 466 | ktime_t sk_stamp; |
b9f40e21 | 467 | u16 sk_tsflags; |
fc64869c | 468 | u8 sk_shutdown; |
09c2d251 | 469 | u32 sk_tskey; |
52267790 | 470 | atomic_t sk_zckey; |
1da177e4 LT |
471 | struct socket *sk_socket; |
472 | void *sk_user_data; | |
d5f64238 | 473 | #ifdef CONFIG_SECURITY |
1da177e4 | 474 | void *sk_security; |
d5f64238 | 475 | #endif |
2a56a1fe | 476 | struct sock_cgroup_data sk_cgrp_data; |
baac50bb | 477 | struct mem_cgroup *sk_memcg; |
1da177e4 | 478 | void (*sk_state_change)(struct sock *sk); |
676d2369 | 479 | void (*sk_data_ready)(struct sock *sk); |
1da177e4 LT |
480 | void (*sk_write_space)(struct sock *sk); |
481 | void (*sk_error_report)(struct sock *sk); | |
dc6b9b78 ED |
482 | int (*sk_backlog_rcv)(struct sock *sk, |
483 | struct sk_buff *skb); | |
ebf4e808 IL |
484 | #ifdef CONFIG_SOCK_VALIDATE_XMIT |
485 | struct sk_buff* (*sk_validate_xmit_skb)(struct sock *sk, | |
486 | struct net_device *dev, | |
487 | struct sk_buff *skb); | |
488 | #endif | |
1da177e4 | 489 | void (*sk_destruct)(struct sock *sk); |
ef456144 | 490 | struct sock_reuseport __rcu *sk_reuseport_cb; |
a4298e45 | 491 | struct rcu_head sk_rcu; |
1da177e4 LT |
492 | }; |
493 | ||
218af599 ED |
494 | enum sk_pacing { |
495 | SK_PACING_NONE = 0, | |
496 | SK_PACING_NEEDED = 1, | |
497 | SK_PACING_FQ = 2, | |
498 | }; | |
499 | ||
559835ea PS |
500 | #define __sk_user_data(sk) ((*((void __rcu **)&(sk)->sk_user_data))) |
501 | ||
502 | #define rcu_dereference_sk_user_data(sk) rcu_dereference(__sk_user_data((sk))) | |
503 | #define rcu_assign_sk_user_data(sk, ptr) rcu_assign_pointer(__sk_user_data((sk)), ptr) | |
504 | ||
4a17fd52 PE |
505 | /* |
506 | * SK_CAN_REUSE and SK_NO_REUSE on a socket mean that the socket is OK | |
507 | * or not whether his port will be reused by someone else. SK_FORCE_REUSE | |
508 | * on a socket means that the socket will reuse everybody else's port | |
509 | * without looking at the other's sk_reuse value. | |
510 | */ | |
511 | ||
512 | #define SK_NO_REUSE 0 | |
513 | #define SK_CAN_REUSE 1 | |
514 | #define SK_FORCE_REUSE 2 | |
515 | ||
627d2d6b | 516 | int sk_set_peek_off(struct sock *sk, int val); |
517 | ||
ef64a54f PE |
518 | static inline int sk_peek_offset(struct sock *sk, int flags) |
519 | { | |
b9bb53f3 | 520 | if (unlikely(flags & MSG_PEEK)) { |
a0917e0b | 521 | return READ_ONCE(sk->sk_peek_off); |
b9bb53f3 WB |
522 | } |
523 | ||
524 | return 0; | |
ef64a54f PE |
525 | } |
526 | ||
527 | static inline void sk_peek_offset_bwd(struct sock *sk, int val) | |
528 | { | |
b9bb53f3 WB |
529 | s32 off = READ_ONCE(sk->sk_peek_off); |
530 | ||
531 | if (unlikely(off >= 0)) { | |
532 | off = max_t(s32, off - val, 0); | |
533 | WRITE_ONCE(sk->sk_peek_off, off); | |
ef64a54f PE |
534 | } |
535 | } | |
536 | ||
537 | static inline void sk_peek_offset_fwd(struct sock *sk, int val) | |
538 | { | |
b9bb53f3 | 539 | sk_peek_offset_bwd(sk, -val); |
ef64a54f PE |
540 | } |
541 | ||
1da177e4 LT |
542 | /* |
543 | * Hashed lists helper routines | |
544 | */ | |
c4146644 LZ |
545 | static inline struct sock *sk_entry(const struct hlist_node *node) |
546 | { | |
547 | return hlist_entry(node, struct sock, sk_node); | |
548 | } | |
549 | ||
e48c414e | 550 | static inline struct sock *__sk_head(const struct hlist_head *head) |
1da177e4 LT |
551 | { |
552 | return hlist_entry(head->first, struct sock, sk_node); | |
553 | } | |
554 | ||
e48c414e | 555 | static inline struct sock *sk_head(const struct hlist_head *head) |
1da177e4 LT |
556 | { |
557 | return hlist_empty(head) ? NULL : __sk_head(head); | |
558 | } | |
559 | ||
88ab1932 ED |
560 | static inline struct sock *__sk_nulls_head(const struct hlist_nulls_head *head) |
561 | { | |
562 | return hlist_nulls_entry(head->first, struct sock, sk_nulls_node); | |
563 | } | |
564 | ||
565 | static inline struct sock *sk_nulls_head(const struct hlist_nulls_head *head) | |
566 | { | |
567 | return hlist_nulls_empty(head) ? NULL : __sk_nulls_head(head); | |
568 | } | |
569 | ||
e48c414e | 570 | static inline struct sock *sk_next(const struct sock *sk) |
1da177e4 | 571 | { |
6c59ebd3 | 572 | return hlist_entry_safe(sk->sk_node.next, struct sock, sk_node); |
1da177e4 LT |
573 | } |
574 | ||
88ab1932 ED |
575 | static inline struct sock *sk_nulls_next(const struct sock *sk) |
576 | { | |
577 | return (!is_a_nulls(sk->sk_nulls_node.next)) ? | |
578 | hlist_nulls_entry(sk->sk_nulls_node.next, | |
579 | struct sock, sk_nulls_node) : | |
580 | NULL; | |
581 | } | |
582 | ||
dc6b9b78 | 583 | static inline bool sk_unhashed(const struct sock *sk) |
1da177e4 LT |
584 | { |
585 | return hlist_unhashed(&sk->sk_node); | |
586 | } | |
587 | ||
dc6b9b78 | 588 | static inline bool sk_hashed(const struct sock *sk) |
1da177e4 | 589 | { |
da753bea | 590 | return !sk_unhashed(sk); |
1da177e4 LT |
591 | } |
592 | ||
dc6b9b78 | 593 | static inline void sk_node_init(struct hlist_node *node) |
1da177e4 LT |
594 | { |
595 | node->pprev = NULL; | |
596 | } | |
597 | ||
dc6b9b78 | 598 | static inline void sk_nulls_node_init(struct hlist_nulls_node *node) |
88ab1932 ED |
599 | { |
600 | node->pprev = NULL; | |
601 | } | |
602 | ||
dc6b9b78 | 603 | static inline void __sk_del_node(struct sock *sk) |
1da177e4 LT |
604 | { |
605 | __hlist_del(&sk->sk_node); | |
606 | } | |
607 | ||
808f5114 | 608 | /* NB: equivalent to hlist_del_init_rcu */ |
dc6b9b78 | 609 | static inline bool __sk_del_node_init(struct sock *sk) |
1da177e4 LT |
610 | { |
611 | if (sk_hashed(sk)) { | |
612 | __sk_del_node(sk); | |
613 | sk_node_init(&sk->sk_node); | |
dc6b9b78 | 614 | return true; |
1da177e4 | 615 | } |
dc6b9b78 | 616 | return false; |
1da177e4 LT |
617 | } |
618 | ||
619 | /* Grab socket reference count. This operation is valid only | |
620 | when sk is ALREADY grabbed f.e. it is found in hash table | |
621 | or a list and the lookup is made under lock preventing hash table | |
622 | modifications. | |
623 | */ | |
624 | ||
f9a7cbbf | 625 | static __always_inline void sock_hold(struct sock *sk) |
1da177e4 | 626 | { |
41c6d650 | 627 | refcount_inc(&sk->sk_refcnt); |
1da177e4 LT |
628 | } |
629 | ||
630 | /* Ungrab socket in the context, which assumes that socket refcnt | |
631 | cannot hit zero, f.e. it is true in context of any socketcall. | |
632 | */ | |
f9a7cbbf | 633 | static __always_inline void __sock_put(struct sock *sk) |
1da177e4 | 634 | { |
41c6d650 | 635 | refcount_dec(&sk->sk_refcnt); |
1da177e4 LT |
636 | } |
637 | ||
dc6b9b78 | 638 | static inline bool sk_del_node_init(struct sock *sk) |
1da177e4 | 639 | { |
dc6b9b78 | 640 | bool rc = __sk_del_node_init(sk); |
1da177e4 LT |
641 | |
642 | if (rc) { | |
643 | /* paranoid for a while -acme */ | |
41c6d650 | 644 | WARN_ON(refcount_read(&sk->sk_refcnt) == 1); |
1da177e4 LT |
645 | __sock_put(sk); |
646 | } | |
647 | return rc; | |
648 | } | |
808f5114 | 649 | #define sk_del_node_init_rcu(sk) sk_del_node_init(sk) |
1da177e4 | 650 | |
dc6b9b78 | 651 | static inline bool __sk_nulls_del_node_init_rcu(struct sock *sk) |
271b72c7 ED |
652 | { |
653 | if (sk_hashed(sk)) { | |
88ab1932 | 654 | hlist_nulls_del_init_rcu(&sk->sk_nulls_node); |
dc6b9b78 | 655 | return true; |
271b72c7 | 656 | } |
dc6b9b78 | 657 | return false; |
271b72c7 ED |
658 | } |
659 | ||
dc6b9b78 | 660 | static inline bool sk_nulls_del_node_init_rcu(struct sock *sk) |
271b72c7 | 661 | { |
dc6b9b78 | 662 | bool rc = __sk_nulls_del_node_init_rcu(sk); |
271b72c7 ED |
663 | |
664 | if (rc) { | |
665 | /* paranoid for a while -acme */ | |
41c6d650 | 666 | WARN_ON(refcount_read(&sk->sk_refcnt) == 1); |
271b72c7 ED |
667 | __sock_put(sk); |
668 | } | |
669 | return rc; | |
670 | } | |
671 | ||
dc6b9b78 | 672 | static inline void __sk_add_node(struct sock *sk, struct hlist_head *list) |
1da177e4 LT |
673 | { |
674 | hlist_add_head(&sk->sk_node, list); | |
675 | } | |
676 | ||
dc6b9b78 | 677 | static inline void sk_add_node(struct sock *sk, struct hlist_head *list) |
1da177e4 LT |
678 | { |
679 | sock_hold(sk); | |
680 | __sk_add_node(sk, list); | |
681 | } | |
682 | ||
dc6b9b78 | 683 | static inline void sk_add_node_rcu(struct sock *sk, struct hlist_head *list) |
808f5114 | 684 | { |
685 | sock_hold(sk); | |
d296ba60 CG |
686 | if (IS_ENABLED(CONFIG_IPV6) && sk->sk_reuseport && |
687 | sk->sk_family == AF_INET6) | |
688 | hlist_add_tail_rcu(&sk->sk_node, list); | |
689 | else | |
690 | hlist_add_head_rcu(&sk->sk_node, list); | |
808f5114 | 691 | } |
692 | ||
dc6b9b78 | 693 | static inline void __sk_nulls_add_node_rcu(struct sock *sk, struct hlist_nulls_head *list) |
271b72c7 | 694 | { |
d7efc6c1 | 695 | hlist_nulls_add_head_rcu(&sk->sk_nulls_node, list); |
271b72c7 ED |
696 | } |
697 | ||
dc6b9b78 | 698 | static inline void sk_nulls_add_node_rcu(struct sock *sk, struct hlist_nulls_head *list) |
271b72c7 ED |
699 | { |
700 | sock_hold(sk); | |
88ab1932 | 701 | __sk_nulls_add_node_rcu(sk, list); |
271b72c7 ED |
702 | } |
703 | ||
dc6b9b78 | 704 | static inline void __sk_del_bind_node(struct sock *sk) |
1da177e4 LT |
705 | { |
706 | __hlist_del(&sk->sk_bind_node); | |
707 | } | |
708 | ||
dc6b9b78 | 709 | static inline void sk_add_bind_node(struct sock *sk, |
1da177e4 LT |
710 | struct hlist_head *list) |
711 | { | |
712 | hlist_add_head(&sk->sk_bind_node, list); | |
713 | } | |
714 | ||
b67bfe0d SL |
715 | #define sk_for_each(__sk, list) \ |
716 | hlist_for_each_entry(__sk, list, sk_node) | |
717 | #define sk_for_each_rcu(__sk, list) \ | |
718 | hlist_for_each_entry_rcu(__sk, list, sk_node) | |
88ab1932 ED |
719 | #define sk_nulls_for_each(__sk, node, list) \ |
720 | hlist_nulls_for_each_entry(__sk, node, list, sk_nulls_node) | |
721 | #define sk_nulls_for_each_rcu(__sk, node, list) \ | |
722 | hlist_nulls_for_each_entry_rcu(__sk, node, list, sk_nulls_node) | |
b67bfe0d SL |
723 | #define sk_for_each_from(__sk) \ |
724 | hlist_for_each_entry_from(__sk, sk_node) | |
88ab1932 ED |
725 | #define sk_nulls_for_each_from(__sk, node) \ |
726 | if (__sk && ({ node = &(__sk)->sk_nulls_node; 1; })) \ | |
727 | hlist_nulls_for_each_entry_from(__sk, node, sk_nulls_node) | |
b67bfe0d SL |
728 | #define sk_for_each_safe(__sk, tmp, list) \ |
729 | hlist_for_each_entry_safe(__sk, tmp, list, sk_node) | |
730 | #define sk_for_each_bound(__sk, list) \ | |
731 | hlist_for_each_entry(__sk, list, sk_bind_node) | |
1da177e4 | 732 | |
2dc41cff | 733 | /** |
ca065d0c | 734 | * sk_for_each_entry_offset_rcu - iterate over a list at a given struct offset |
2dc41cff DH |
735 | * @tpos: the type * to use as a loop cursor. |
736 | * @pos: the &struct hlist_node to use as a loop cursor. | |
737 | * @head: the head for your list. | |
738 | * @offset: offset of hlist_node within the struct. | |
739 | * | |
740 | */ | |
ca065d0c | 741 | #define sk_for_each_entry_offset_rcu(tpos, pos, head, offset) \ |
b6f4f848 | 742 | for (pos = rcu_dereference(hlist_first_rcu(head)); \ |
ca065d0c | 743 | pos != NULL && \ |
2dc41cff | 744 | ({ tpos = (typeof(*tpos) *)((void *)pos - offset); 1;}); \ |
b6f4f848 | 745 | pos = rcu_dereference(hlist_next_rcu(pos))) |
2dc41cff | 746 | |
c336d148 EB |
747 | static inline struct user_namespace *sk_user_ns(struct sock *sk) |
748 | { | |
749 | /* Careful only use this in a context where these parameters | |
750 | * can not change and must all be valid, such as recvmsg from | |
751 | * userspace. | |
752 | */ | |
753 | return sk->sk_socket->file->f_cred->user_ns; | |
754 | } | |
755 | ||
1da177e4 LT |
756 | /* Sock flags */ |
757 | enum sock_flags { | |
758 | SOCK_DEAD, | |
759 | SOCK_DONE, | |
760 | SOCK_URGINLINE, | |
761 | SOCK_KEEPOPEN, | |
762 | SOCK_LINGER, | |
763 | SOCK_DESTROY, | |
764 | SOCK_BROADCAST, | |
765 | SOCK_TIMESTAMP, | |
766 | SOCK_ZAPPED, | |
767 | SOCK_USE_WRITE_QUEUE, /* whether to call sk->sk_write_space in sock_wfree */ | |
768 | SOCK_DBG, /* %SO_DEBUG setting */ | |
769 | SOCK_RCVTSTAMP, /* %SO_TIMESTAMP setting */ | |
92f37fd2 | 770 | SOCK_RCVTSTAMPNS, /* %SO_TIMESTAMPNS setting */ |
1da177e4 LT |
771 | SOCK_LOCALROUTE, /* route locally only, %SO_DONTROUTE setting */ |
772 | SOCK_QUEUE_SHRUNK, /* write queue has been shrunk recently */ | |
7cb02404 | 773 | SOCK_MEMALLOC, /* VM depends on this socket for swapping */ |
20d49473 | 774 | SOCK_TIMESTAMPING_RX_SOFTWARE, /* %SOF_TIMESTAMPING_RX_SOFTWARE */ |
bcdce719 | 775 | SOCK_FASYNC, /* fasync() active */ |
3b885787 | 776 | SOCK_RXQ_OVFL, |
1cdebb42 | 777 | SOCK_ZEROCOPY, /* buffers from userspace */ |
6e3e939f | 778 | SOCK_WIFI_STATUS, /* push wifi status to userspace */ |
3bdc0eba BG |
779 | SOCK_NOFCS, /* Tell NIC not to do the Ethernet FCS. |
780 | * Will use last 4 bytes of packet sent from | |
781 | * user-space instead. | |
782 | */ | |
d59577b6 | 783 | SOCK_FILTER_LOCKED, /* Filter cannot be changed anymore */ |
7d4c04fc | 784 | SOCK_SELECT_ERR_QUEUE, /* Wake select on error queue */ |
a4298e45 | 785 | SOCK_RCU_FREE, /* wait rcu grace period in sk_destruct() */ |
1da177e4 LT |
786 | }; |
787 | ||
01ce63c9 MRL |
788 | #define SK_FLAGS_TIMESTAMP ((1UL << SOCK_TIMESTAMP) | (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE)) |
789 | ||
53b924b3 RB |
790 | static inline void sock_copy_flags(struct sock *nsk, struct sock *osk) |
791 | { | |
792 | nsk->sk_flags = osk->sk_flags; | |
793 | } | |
794 | ||
1da177e4 LT |
795 | static inline void sock_set_flag(struct sock *sk, enum sock_flags flag) |
796 | { | |
797 | __set_bit(flag, &sk->sk_flags); | |
798 | } | |
799 | ||
800 | static inline void sock_reset_flag(struct sock *sk, enum sock_flags flag) | |
801 | { | |
802 | __clear_bit(flag, &sk->sk_flags); | |
803 | } | |
804 | ||
1b23a5df | 805 | static inline bool sock_flag(const struct sock *sk, enum sock_flags flag) |
1da177e4 LT |
806 | { |
807 | return test_bit(flag, &sk->sk_flags); | |
808 | } | |
809 | ||
c93bdd0e | 810 | #ifdef CONFIG_NET |
a7950ae8 | 811 | DECLARE_STATIC_KEY_FALSE(memalloc_socks_key); |
c93bdd0e MG |
812 | static inline int sk_memalloc_socks(void) |
813 | { | |
a7950ae8 | 814 | return static_branch_unlikely(&memalloc_socks_key); |
c93bdd0e MG |
815 | } |
816 | #else | |
817 | ||
818 | static inline int sk_memalloc_socks(void) | |
819 | { | |
820 | return 0; | |
821 | } | |
822 | ||
823 | #endif | |
824 | ||
7450aaf6 | 825 | static inline gfp_t sk_gfp_mask(const struct sock *sk, gfp_t gfp_mask) |
99a1dec7 | 826 | { |
7450aaf6 | 827 | return gfp_mask | (sk->sk_allocation & __GFP_MEMALLOC); |
99a1dec7 MG |
828 | } |
829 | ||
1da177e4 LT |
830 | static inline void sk_acceptq_removed(struct sock *sk) |
831 | { | |
832 | sk->sk_ack_backlog--; | |
833 | } | |
834 | ||
835 | static inline void sk_acceptq_added(struct sock *sk) | |
836 | { | |
837 | sk->sk_ack_backlog++; | |
838 | } | |
839 | ||
dc6b9b78 | 840 | static inline bool sk_acceptq_is_full(const struct sock *sk) |
1da177e4 | 841 | { |
64a14651 | 842 | return sk->sk_ack_backlog > sk->sk_max_ack_backlog; |
1da177e4 LT |
843 | } |
844 | ||
845 | /* | |
846 | * Compute minimal free write space needed to queue new packets. | |
847 | */ | |
dc6b9b78 | 848 | static inline int sk_stream_min_wspace(const struct sock *sk) |
1da177e4 | 849 | { |
8df09ea3 | 850 | return sk->sk_wmem_queued >> 1; |
1da177e4 LT |
851 | } |
852 | ||
dc6b9b78 | 853 | static inline int sk_stream_wspace(const struct sock *sk) |
1da177e4 LT |
854 | { |
855 | return sk->sk_sndbuf - sk->sk_wmem_queued; | |
856 | } | |
857 | ||
69336bd2 | 858 | void sk_stream_write_space(struct sock *sk); |
1da177e4 | 859 | |
8eae939f | 860 | /* OOB backlog add */ |
a3a858ff | 861 | static inline void __sk_add_backlog(struct sock *sk, struct sk_buff *skb) |
9ee6b535 | 862 | { |
7fee226a | 863 | /* dont let skb dst not refcounted, we are going to leave rcu lock */ |
222d7dbd | 864 | skb_dst_force(skb); |
7fee226a ED |
865 | |
866 | if (!sk->sk_backlog.tail) | |
867 | sk->sk_backlog.head = skb; | |
868 | else | |
9ee6b535 | 869 | sk->sk_backlog.tail->next = skb; |
7fee226a ED |
870 | |
871 | sk->sk_backlog.tail = skb; | |
9ee6b535 SH |
872 | skb->next = NULL; |
873 | } | |
1da177e4 | 874 | |
c377411f ED |
875 | /* |
876 | * Take into account size of receive queue and backlog queue | |
0fd7bac6 ED |
877 | * Do not take into account this skb truesize, |
878 | * to allow even a single big packet to come. | |
c377411f | 879 | */ |
274f482d | 880 | static inline bool sk_rcvqueues_full(const struct sock *sk, unsigned int limit) |
c377411f ED |
881 | { |
882 | unsigned int qsize = sk->sk_backlog.len + atomic_read(&sk->sk_rmem_alloc); | |
883 | ||
f545a38f | 884 | return qsize > limit; |
c377411f ED |
885 | } |
886 | ||
8eae939f | 887 | /* The per-socket spinlock must be held here. */ |
f545a38f ED |
888 | static inline __must_check int sk_add_backlog(struct sock *sk, struct sk_buff *skb, |
889 | unsigned int limit) | |
8eae939f | 890 | { |
274f482d | 891 | if (sk_rcvqueues_full(sk, limit)) |
8eae939f ZY |
892 | return -ENOBUFS; |
893 | ||
c7c49b8f ED |
894 | /* |
895 | * If the skb was allocated from pfmemalloc reserves, only | |
896 | * allow SOCK_MEMALLOC sockets to use it as this socket is | |
897 | * helping free memory | |
898 | */ | |
899 | if (skb_pfmemalloc(skb) && !sock_flag(sk, SOCK_MEMALLOC)) | |
900 | return -ENOMEM; | |
901 | ||
a3a858ff | 902 | __sk_add_backlog(sk, skb); |
8eae939f ZY |
903 | sk->sk_backlog.len += skb->truesize; |
904 | return 0; | |
905 | } | |
906 | ||
69336bd2 | 907 | int __sk_backlog_rcv(struct sock *sk, struct sk_buff *skb); |
b4b9e355 | 908 | |
c57943a1 PZ |
909 | static inline int sk_backlog_rcv(struct sock *sk, struct sk_buff *skb) |
910 | { | |
b4b9e355 MG |
911 | if (sk_memalloc_socks() && skb_pfmemalloc(skb)) |
912 | return __sk_backlog_rcv(sk, skb); | |
913 | ||
c57943a1 PZ |
914 | return sk->sk_backlog_rcv(sk, skb); |
915 | } | |
916 | ||
2c8c56e1 ED |
917 | static inline void sk_incoming_cpu_update(struct sock *sk) |
918 | { | |
34cfb542 PA |
919 | int cpu = raw_smp_processor_id(); |
920 | ||
921 | if (unlikely(sk->sk_incoming_cpu != cpu)) | |
922 | sk->sk_incoming_cpu = cpu; | |
2c8c56e1 ED |
923 | } |
924 | ||
fe477558 | 925 | static inline void sock_rps_record_flow_hash(__u32 hash) |
c58dc01b DM |
926 | { |
927 | #ifdef CONFIG_RPS | |
928 | struct rps_sock_flow_table *sock_flow_table; | |
929 | ||
930 | rcu_read_lock(); | |
931 | sock_flow_table = rcu_dereference(rps_sock_flow_table); | |
fe477558 | 932 | rps_record_sock_flow(sock_flow_table, hash); |
c58dc01b DM |
933 | rcu_read_unlock(); |
934 | #endif | |
935 | } | |
936 | ||
fe477558 TH |
937 | static inline void sock_rps_record_flow(const struct sock *sk) |
938 | { | |
c9d8ca04 | 939 | #ifdef CONFIG_RPS |
13bfff25 ED |
940 | if (static_key_false(&rfs_needed)) { |
941 | /* Reading sk->sk_rxhash might incur an expensive cache line | |
942 | * miss. | |
943 | * | |
944 | * TCP_ESTABLISHED does cover almost all states where RFS | |
945 | * might be useful, and is cheaper [1] than testing : | |
946 | * IPv4: inet_sk(sk)->inet_daddr | |
947 | * IPv6: ipv6_addr_any(&sk->sk_v6_daddr) | |
948 | * OR an additional socket flag | |
949 | * [1] : sk_state and sk_prot are in the same cache line. | |
950 | */ | |
951 | if (sk->sk_state == TCP_ESTABLISHED) | |
952 | sock_rps_record_flow_hash(sk->sk_rxhash); | |
953 | } | |
c9d8ca04 | 954 | #endif |
fe477558 TH |
955 | } |
956 | ||
bdeab991 TH |
957 | static inline void sock_rps_save_rxhash(struct sock *sk, |
958 | const struct sk_buff *skb) | |
c58dc01b DM |
959 | { |
960 | #ifdef CONFIG_RPS | |
567e4b79 | 961 | if (unlikely(sk->sk_rxhash != skb->hash)) |
61b905da | 962 | sk->sk_rxhash = skb->hash; |
c58dc01b DM |
963 | #endif |
964 | } | |
965 | ||
bdeab991 TH |
966 | static inline void sock_rps_reset_rxhash(struct sock *sk) |
967 | { | |
968 | #ifdef CONFIG_RPS | |
bdeab991 TH |
969 | sk->sk_rxhash = 0; |
970 | #endif | |
971 | } | |
972 | ||
d9dc8b0f | 973 | #define sk_wait_event(__sk, __timeo, __condition, __wait) \ |
cfcabdcc SH |
974 | ({ int __rc; \ |
975 | release_sock(__sk); \ | |
976 | __rc = __condition; \ | |
977 | if (!__rc) { \ | |
d9dc8b0f WC |
978 | *(__timeo) = wait_woken(__wait, \ |
979 | TASK_INTERRUPTIBLE, \ | |
980 | *(__timeo)); \ | |
cfcabdcc | 981 | } \ |
d9dc8b0f | 982 | sched_annotate_sleep(); \ |
cfcabdcc SH |
983 | lock_sock(__sk); \ |
984 | __rc = __condition; \ | |
985 | __rc; \ | |
986 | }) | |
1da177e4 | 987 | |
69336bd2 JP |
988 | int sk_stream_wait_connect(struct sock *sk, long *timeo_p); |
989 | int sk_stream_wait_memory(struct sock *sk, long *timeo_p); | |
990 | void sk_stream_wait_close(struct sock *sk, long timeo_p); | |
991 | int sk_stream_error(struct sock *sk, int flags, int err); | |
992 | void sk_stream_kill_queues(struct sock *sk); | |
993 | void sk_set_memalloc(struct sock *sk); | |
994 | void sk_clear_memalloc(struct sock *sk); | |
1da177e4 | 995 | |
d41a69f1 ED |
996 | void __sk_flush_backlog(struct sock *sk); |
997 | ||
998 | static inline bool sk_flush_backlog(struct sock *sk) | |
999 | { | |
1000 | if (unlikely(READ_ONCE(sk->sk_backlog.tail))) { | |
1001 | __sk_flush_backlog(sk); | |
1002 | return true; | |
1003 | } | |
1004 | return false; | |
1005 | } | |
1006 | ||
dfbafc99 | 1007 | int sk_wait_data(struct sock *sk, long *timeo, const struct sk_buff *skb); |
1da177e4 | 1008 | |
60236fdd | 1009 | struct request_sock_ops; |
6d6ee43e | 1010 | struct timewait_sock_ops; |
ab1e0a13 | 1011 | struct inet_hashinfo; |
fc8717ba | 1012 | struct raw_hashinfo; |
f16a7dd5 | 1013 | struct smc_hashinfo; |
de477254 | 1014 | struct module; |
2e6599cb | 1015 | |
f77d6021 | 1016 | /* |
5f0d5a3a | 1017 | * caches using SLAB_TYPESAFE_BY_RCU should let .next pointer from nulls nodes |
f77d6021 ED |
1018 | * un-modified. Special care is taken when initializing object to zero. |
1019 | */ | |
1020 | static inline void sk_prot_clear_nulls(struct sock *sk, int size) | |
1021 | { | |
1022 | if (offsetof(struct sock, sk_node.next) != 0) | |
1023 | memset(sk, 0, offsetof(struct sock, sk_node.next)); | |
1024 | memset(&sk->sk_node.pprev, 0, | |
1025 | size - offsetof(struct sock, sk_node.pprev)); | |
1026 | } | |
1027 | ||
1da177e4 LT |
1028 | /* Networking protocol blocks we attach to sockets. |
1029 | * socket layer -> transport layer interface | |
1da177e4 LT |
1030 | */ |
1031 | struct proto { | |
dc6b9b78 | 1032 | void (*close)(struct sock *sk, |
1da177e4 | 1033 | long timeout); |
d74bad4e AI |
1034 | int (*pre_connect)(struct sock *sk, |
1035 | struct sockaddr *uaddr, | |
1036 | int addr_len); | |
1da177e4 | 1037 | int (*connect)(struct sock *sk, |
dc6b9b78 | 1038 | struct sockaddr *uaddr, |
1da177e4 LT |
1039 | int addr_len); |
1040 | int (*disconnect)(struct sock *sk, int flags); | |
1041 | ||
cdfbabfb DH |
1042 | struct sock * (*accept)(struct sock *sk, int flags, int *err, |
1043 | bool kern); | |
1da177e4 LT |
1044 | |
1045 | int (*ioctl)(struct sock *sk, int cmd, | |
1046 | unsigned long arg); | |
1047 | int (*init)(struct sock *sk); | |
7d06b2e0 | 1048 | void (*destroy)(struct sock *sk); |
1da177e4 | 1049 | void (*shutdown)(struct sock *sk, int how); |
dc6b9b78 | 1050 | int (*setsockopt)(struct sock *sk, int level, |
1da177e4 | 1051 | int optname, char __user *optval, |
b7058842 | 1052 | unsigned int optlen); |
dc6b9b78 ED |
1053 | int (*getsockopt)(struct sock *sk, int level, |
1054 | int optname, char __user *optval, | |
1055 | int __user *option); | |
4b9d07a4 | 1056 | void (*keepalive)(struct sock *sk, int valbool); |
af01d537 | 1057 | #ifdef CONFIG_COMPAT |
3fdadf7d DM |
1058 | int (*compat_setsockopt)(struct sock *sk, |
1059 | int level, | |
1060 | int optname, char __user *optval, | |
b7058842 | 1061 | unsigned int optlen); |
3fdadf7d DM |
1062 | int (*compat_getsockopt)(struct sock *sk, |
1063 | int level, | |
1064 | int optname, char __user *optval, | |
1065 | int __user *option); | |
709b46e8 EB |
1066 | int (*compat_ioctl)(struct sock *sk, |
1067 | unsigned int cmd, unsigned long arg); | |
af01d537 | 1068 | #endif |
1b784140 YX |
1069 | int (*sendmsg)(struct sock *sk, struct msghdr *msg, |
1070 | size_t len); | |
1071 | int (*recvmsg)(struct sock *sk, struct msghdr *msg, | |
dc6b9b78 ED |
1072 | size_t len, int noblock, int flags, |
1073 | int *addr_len); | |
1da177e4 LT |
1074 | int (*sendpage)(struct sock *sk, struct page *page, |
1075 | int offset, size_t size, int flags); | |
dc6b9b78 | 1076 | int (*bind)(struct sock *sk, |
1da177e4 LT |
1077 | struct sockaddr *uaddr, int addr_len); |
1078 | ||
dc6b9b78 | 1079 | int (*backlog_rcv) (struct sock *sk, |
1da177e4 LT |
1080 | struct sk_buff *skb); |
1081 | ||
46d3ceab ED |
1082 | void (*release_cb)(struct sock *sk); |
1083 | ||
1da177e4 | 1084 | /* Keeping track of sk's, looking them up, and port selection methods. */ |
086c653f | 1085 | int (*hash)(struct sock *sk); |
1da177e4 | 1086 | void (*unhash)(struct sock *sk); |
719f8358 | 1087 | void (*rehash)(struct sock *sk); |
1da177e4 LT |
1088 | int (*get_port)(struct sock *sk, unsigned short snum); |
1089 | ||
286ab3d4 | 1090 | /* Keeping track of sockets in use */ |
65f76517 | 1091 | #ifdef CONFIG_PROC_FS |
13ff3d6f | 1092 | unsigned int inuse_idx; |
65f76517 | 1093 | #endif |
ebb53d75 | 1094 | |
c9bee3b7 | 1095 | bool (*stream_memory_free)(const struct sock *sk); |
8934ce2f | 1096 | bool (*stream_memory_read)(const struct sock *sk); |
1da177e4 | 1097 | /* Memory pressure */ |
5c52ba17 | 1098 | void (*enter_memory_pressure)(struct sock *sk); |
06044751 | 1099 | void (*leave_memory_pressure)(struct sock *sk); |
8d987e5c | 1100 | atomic_long_t *memory_allocated; /* Current allocated memory. */ |
1748376b | 1101 | struct percpu_counter *sockets_allocated; /* Current number of sockets. */ |
1da177e4 LT |
1102 | /* |
1103 | * Pressure flag: try to collapse. | |
1104 | * Technical note: it is used by multiple contexts non atomically. | |
3ab224be | 1105 | * All the __sk_mem_schedule() is of this nature: accounting |
1da177e4 LT |
1106 | * is strict, actions are advisory and have some latency. |
1107 | */ | |
06044751 | 1108 | unsigned long *memory_pressure; |
8d987e5c | 1109 | long *sysctl_mem; |
a3dcaf17 | 1110 | |
1da177e4 LT |
1111 | int *sysctl_wmem; |
1112 | int *sysctl_rmem; | |
a3dcaf17 ED |
1113 | u32 sysctl_wmem_offset; |
1114 | u32 sysctl_rmem_offset; | |
1115 | ||
1da177e4 | 1116 | int max_header; |
7ba42910 | 1117 | bool no_autobind; |
1da177e4 | 1118 | |
271b72c7 | 1119 | struct kmem_cache *slab; |
1da177e4 | 1120 | unsigned int obj_size; |
d50112ed | 1121 | slab_flags_t slab_flags; |
7bbdb81e AD |
1122 | unsigned int useroffset; /* Usercopy region offset */ |
1123 | unsigned int usersize; /* Usercopy region size */ | |
1da177e4 | 1124 | |
dd24c001 | 1125 | struct percpu_counter *orphan_count; |
8feaf0c0 | 1126 | |
60236fdd | 1127 | struct request_sock_ops *rsk_prot; |
6d6ee43e | 1128 | struct timewait_sock_ops *twsk_prot; |
2e6599cb | 1129 | |
39d8cda7 PE |
1130 | union { |
1131 | struct inet_hashinfo *hashinfo; | |
645ca708 | 1132 | struct udp_table *udp_table; |
fc8717ba | 1133 | struct raw_hashinfo *raw_hash; |
f16a7dd5 | 1134 | struct smc_hashinfo *smc_hash; |
39d8cda7 | 1135 | } h; |
ab1e0a13 | 1136 | |
1da177e4 LT |
1137 | struct module *owner; |
1138 | ||
1139 | char name[32]; | |
1140 | ||
1141 | struct list_head node; | |
e6848976 ACM |
1142 | #ifdef SOCK_REFCNT_DEBUG |
1143 | atomic_t socks; | |
e1aab161 | 1144 | #endif |
64be0aed | 1145 | int (*diag_destroy)(struct sock *sk, int err); |
3859a271 | 1146 | } __randomize_layout; |
e1aab161 | 1147 | |
69336bd2 JP |
1148 | int proto_register(struct proto *prot, int alloc_slab); |
1149 | void proto_unregister(struct proto *prot); | |
bf2ae2e4 | 1150 | int sock_load_diag_module(int family, int protocol); |
1da177e4 | 1151 | |
e6848976 ACM |
1152 | #ifdef SOCK_REFCNT_DEBUG |
1153 | static inline void sk_refcnt_debug_inc(struct sock *sk) | |
1154 | { | |
1155 | atomic_inc(&sk->sk_prot->socks); | |
1156 | } | |
1157 | ||
1158 | static inline void sk_refcnt_debug_dec(struct sock *sk) | |
1159 | { | |
1160 | atomic_dec(&sk->sk_prot->socks); | |
1161 | printk(KERN_DEBUG "%s socket %p released, %d are still alive\n", | |
1162 | sk->sk_prot->name, sk, atomic_read(&sk->sk_prot->socks)); | |
1163 | } | |
1164 | ||
dec34fb0 | 1165 | static inline void sk_refcnt_debug_release(const struct sock *sk) |
e6848976 | 1166 | { |
41c6d650 | 1167 | if (refcount_read(&sk->sk_refcnt) != 1) |
e6848976 | 1168 | printk(KERN_DEBUG "Destruction of the %s socket %p delayed, refcnt=%d\n", |
41c6d650 | 1169 | sk->sk_prot->name, sk, refcount_read(&sk->sk_refcnt)); |
e6848976 ACM |
1170 | } |
1171 | #else /* SOCK_REFCNT_DEBUG */ | |
1172 | #define sk_refcnt_debug_inc(sk) do { } while (0) | |
1173 | #define sk_refcnt_debug_dec(sk) do { } while (0) | |
1174 | #define sk_refcnt_debug_release(sk) do { } while (0) | |
1175 | #endif /* SOCK_REFCNT_DEBUG */ | |
1176 | ||
c9bee3b7 ED |
1177 | static inline bool sk_stream_memory_free(const struct sock *sk) |
1178 | { | |
1179 | if (sk->sk_wmem_queued >= sk->sk_sndbuf) | |
1180 | return false; | |
1181 | ||
1182 | return sk->sk_prot->stream_memory_free ? | |
1183 | sk->sk_prot->stream_memory_free(sk) : true; | |
1184 | } | |
1185 | ||
64dc6130 ED |
1186 | static inline bool sk_stream_is_writeable(const struct sock *sk) |
1187 | { | |
c9bee3b7 ED |
1188 | return sk_stream_wspace(sk) >= sk_stream_min_wspace(sk) && |
1189 | sk_stream_memory_free(sk); | |
64dc6130 | 1190 | } |
e1aab161 | 1191 | |
54fd9c2d DB |
1192 | static inline int sk_under_cgroup_hierarchy(struct sock *sk, |
1193 | struct cgroup *ancestor) | |
1194 | { | |
1195 | #ifdef CONFIG_SOCK_CGROUP_DATA | |
1196 | return cgroup_is_descendant(sock_cgroup_ptr(&sk->sk_cgrp_data), | |
1197 | ancestor); | |
1198 | #else | |
1199 | return -ENOTSUPP; | |
1200 | #endif | |
1201 | } | |
c9bee3b7 | 1202 | |
180d8cd9 GC |
1203 | static inline bool sk_has_memory_pressure(const struct sock *sk) |
1204 | { | |
1205 | return sk->sk_prot->memory_pressure != NULL; | |
1206 | } | |
1207 | ||
1208 | static inline bool sk_under_memory_pressure(const struct sock *sk) | |
1209 | { | |
1210 | if (!sk->sk_prot->memory_pressure) | |
1211 | return false; | |
e1aab161 | 1212 | |
baac50bb JW |
1213 | if (mem_cgroup_sockets_enabled && sk->sk_memcg && |
1214 | mem_cgroup_under_socket_pressure(sk->sk_memcg)) | |
e805605c | 1215 | return true; |
e1aab161 | 1216 | |
35b87f6c | 1217 | return !!*sk->sk_prot->memory_pressure; |
180d8cd9 GC |
1218 | } |
1219 | ||
180d8cd9 GC |
1220 | static inline long |
1221 | sk_memory_allocated(const struct sock *sk) | |
1222 | { | |
e805605c | 1223 | return atomic_long_read(sk->sk_prot->memory_allocated); |
180d8cd9 GC |
1224 | } |
1225 | ||
1226 | static inline long | |
e805605c | 1227 | sk_memory_allocated_add(struct sock *sk, int amt) |
180d8cd9 | 1228 | { |
e805605c | 1229 | return atomic_long_add_return(amt, sk->sk_prot->memory_allocated); |
180d8cd9 GC |
1230 | } |
1231 | ||
1232 | static inline void | |
0e90b31f | 1233 | sk_memory_allocated_sub(struct sock *sk, int amt) |
180d8cd9 | 1234 | { |
e805605c | 1235 | atomic_long_sub(amt, sk->sk_prot->memory_allocated); |
180d8cd9 GC |
1236 | } |
1237 | ||
1238 | static inline void sk_sockets_allocated_dec(struct sock *sk) | |
1239 | { | |
af95d7df | 1240 | percpu_counter_dec(sk->sk_prot->sockets_allocated); |
180d8cd9 GC |
1241 | } |
1242 | ||
1243 | static inline void sk_sockets_allocated_inc(struct sock *sk) | |
1244 | { | |
af95d7df | 1245 | percpu_counter_inc(sk->sk_prot->sockets_allocated); |
180d8cd9 GC |
1246 | } |
1247 | ||
1248 | static inline int | |
1249 | sk_sockets_allocated_read_positive(struct sock *sk) | |
1250 | { | |
af95d7df | 1251 | return percpu_counter_read_positive(sk->sk_prot->sockets_allocated); |
180d8cd9 GC |
1252 | } |
1253 | ||
1254 | static inline int | |
1255 | proto_sockets_allocated_sum_positive(struct proto *prot) | |
1256 | { | |
1257 | return percpu_counter_sum_positive(prot->sockets_allocated); | |
1258 | } | |
1259 | ||
1260 | static inline long | |
1261 | proto_memory_allocated(struct proto *prot) | |
1262 | { | |
1263 | return atomic_long_read(prot->memory_allocated); | |
1264 | } | |
1265 | ||
1266 | static inline bool | |
1267 | proto_memory_pressure(struct proto *prot) | |
1268 | { | |
1269 | if (!prot->memory_pressure) | |
1270 | return false; | |
1271 | return !!*prot->memory_pressure; | |
1272 | } | |
1273 | ||
65f76517 ED |
1274 | |
1275 | #ifdef CONFIG_PROC_FS | |
1da177e4 | 1276 | /* Called with local bh disabled */ |
69336bd2 JP |
1277 | void sock_prot_inuse_add(struct net *net, struct proto *prot, int inc); |
1278 | int sock_prot_inuse_get(struct net *net, struct proto *proto); | |
648845ab | 1279 | int sock_inuse_get(struct net *net); |
65f76517 | 1280 | #else |
dc6b9b78 | 1281 | static inline void sock_prot_inuse_add(struct net *net, struct proto *prot, |
c29a0bc4 | 1282 | int inc) |
65f76517 ED |
1283 | { |
1284 | } | |
65f76517 ED |
1285 | #endif |
1286 | ||
1da177e4 | 1287 | |
614c6cb4 ACM |
1288 | /* With per-bucket locks this operation is not-atomic, so that |
1289 | * this version is not worse. | |
1290 | */ | |
086c653f | 1291 | static inline int __sk_prot_rehash(struct sock *sk) |
614c6cb4 ACM |
1292 | { |
1293 | sk->sk_prot->unhash(sk); | |
086c653f | 1294 | return sk->sk_prot->hash(sk); |
614c6cb4 ACM |
1295 | } |
1296 | ||
1da177e4 LT |
1297 | /* About 10 seconds */ |
1298 | #define SOCK_DESTROY_TIME (10*HZ) | |
1299 | ||
1300 | /* Sockets 0-1023 can't be bound to unless you are superuser */ | |
1301 | #define PROT_SOCK 1024 | |
1302 | ||
1303 | #define SHUTDOWN_MASK 3 | |
1304 | #define RCV_SHUTDOWN 1 | |
1305 | #define SEND_SHUTDOWN 2 | |
1306 | ||
1307 | #define SOCK_SNDBUF_LOCK 1 | |
1308 | #define SOCK_RCVBUF_LOCK 2 | |
1309 | #define SOCK_BINDADDR_LOCK 4 | |
1310 | #define SOCK_BINDPORT_LOCK 8 | |
1311 | ||
1da177e4 LT |
1312 | struct socket_alloc { |
1313 | struct socket socket; | |
1314 | struct inode vfs_inode; | |
1315 | }; | |
1316 | ||
1317 | static inline struct socket *SOCKET_I(struct inode *inode) | |
1318 | { | |
1319 | return &container_of(inode, struct socket_alloc, vfs_inode)->socket; | |
1320 | } | |
1321 | ||
1322 | static inline struct inode *SOCK_INODE(struct socket *socket) | |
1323 | { | |
1324 | return &container_of(socket, struct socket_alloc, socket)->vfs_inode; | |
1325 | } | |
1326 | ||
3ab224be HA |
1327 | /* |
1328 | * Functions for memory accounting | |
1329 | */ | |
f8c3bf00 | 1330 | int __sk_mem_raise_allocated(struct sock *sk, int size, int amt, int kind); |
69336bd2 | 1331 | int __sk_mem_schedule(struct sock *sk, int size, int kind); |
f8c3bf00 | 1332 | void __sk_mem_reduce_allocated(struct sock *sk, int amount); |
1a24e04e | 1333 | void __sk_mem_reclaim(struct sock *sk, int amount); |
1da177e4 | 1334 | |
bd68a2a8 ED |
1335 | /* We used to have PAGE_SIZE here, but systems with 64KB pages |
1336 | * do not necessarily have 16x time more memory than 4KB ones. | |
1337 | */ | |
1338 | #define SK_MEM_QUANTUM 4096 | |
3ab224be HA |
1339 | #define SK_MEM_QUANTUM_SHIFT ilog2(SK_MEM_QUANTUM) |
1340 | #define SK_MEM_SEND 0 | |
1341 | #define SK_MEM_RECV 1 | |
1da177e4 | 1342 | |
bd68a2a8 ED |
1343 | /* sysctl_mem values are in pages, we convert them in SK_MEM_QUANTUM units */ |
1344 | static inline long sk_prot_mem_limits(const struct sock *sk, int index) | |
1345 | { | |
1346 | long val = sk->sk_prot->sysctl_mem[index]; | |
1347 | ||
1348 | #if PAGE_SIZE > SK_MEM_QUANTUM | |
1349 | val <<= PAGE_SHIFT - SK_MEM_QUANTUM_SHIFT; | |
1350 | #elif PAGE_SIZE < SK_MEM_QUANTUM | |
1351 | val >>= SK_MEM_QUANTUM_SHIFT - PAGE_SHIFT; | |
1352 | #endif | |
1353 | return val; | |
1354 | } | |
1355 | ||
3ab224be | 1356 | static inline int sk_mem_pages(int amt) |
1da177e4 | 1357 | { |
3ab224be | 1358 | return (amt + SK_MEM_QUANTUM - 1) >> SK_MEM_QUANTUM_SHIFT; |
1da177e4 LT |
1359 | } |
1360 | ||
dc6b9b78 | 1361 | static inline bool sk_has_account(struct sock *sk) |
1da177e4 | 1362 | { |
3ab224be HA |
1363 | /* return true if protocol supports memory accounting */ |
1364 | return !!sk->sk_prot->memory_allocated; | |
1da177e4 LT |
1365 | } |
1366 | ||
dc6b9b78 | 1367 | static inline bool sk_wmem_schedule(struct sock *sk, int size) |
1da177e4 | 1368 | { |
3ab224be | 1369 | if (!sk_has_account(sk)) |
dc6b9b78 | 1370 | return true; |
3ab224be HA |
1371 | return size <= sk->sk_forward_alloc || |
1372 | __sk_mem_schedule(sk, size, SK_MEM_SEND); | |
1da177e4 LT |
1373 | } |
1374 | ||
c76562b6 | 1375 | static inline bool |
35c448a8 | 1376 | sk_rmem_schedule(struct sock *sk, struct sk_buff *skb, int size) |
d80d99d6 | 1377 | { |
3ab224be | 1378 | if (!sk_has_account(sk)) |
dc6b9b78 | 1379 | return true; |
c76562b6 MG |
1380 | return size<= sk->sk_forward_alloc || |
1381 | __sk_mem_schedule(sk, size, SK_MEM_RECV) || | |
1382 | skb_pfmemalloc(skb); | |
3ab224be HA |
1383 | } |
1384 | ||
1385 | static inline void sk_mem_reclaim(struct sock *sk) | |
1386 | { | |
1387 | if (!sk_has_account(sk)) | |
1388 | return; | |
1389 | if (sk->sk_forward_alloc >= SK_MEM_QUANTUM) | |
1a24e04e | 1390 | __sk_mem_reclaim(sk, sk->sk_forward_alloc); |
3ab224be HA |
1391 | } |
1392 | ||
9993e7d3 DM |
1393 | static inline void sk_mem_reclaim_partial(struct sock *sk) |
1394 | { | |
1395 | if (!sk_has_account(sk)) | |
1396 | return; | |
1397 | if (sk->sk_forward_alloc > SK_MEM_QUANTUM) | |
1a24e04e | 1398 | __sk_mem_reclaim(sk, sk->sk_forward_alloc - 1); |
9993e7d3 DM |
1399 | } |
1400 | ||
3ab224be HA |
1401 | static inline void sk_mem_charge(struct sock *sk, int size) |
1402 | { | |
1403 | if (!sk_has_account(sk)) | |
1404 | return; | |
1405 | sk->sk_forward_alloc -= size; | |
1406 | } | |
1407 | ||
1408 | static inline void sk_mem_uncharge(struct sock *sk, int size) | |
1409 | { | |
1410 | if (!sk_has_account(sk)) | |
1411 | return; | |
1412 | sk->sk_forward_alloc += size; | |
20c64d5c ED |
1413 | |
1414 | /* Avoid a possible overflow. | |
1415 | * TCP send queues can make this happen, if sk_mem_reclaim() | |
1416 | * is not called and more than 2 GBytes are released at once. | |
1417 | * | |
1418 | * If we reach 2 MBytes, reclaim 1 MBytes right now, there is | |
1419 | * no need to hold that much forward allocation anyway. | |
1420 | */ | |
1421 | if (unlikely(sk->sk_forward_alloc >= 1 << 21)) | |
1422 | __sk_mem_reclaim(sk, 1 << 20); | |
3ab224be HA |
1423 | } |
1424 | ||
1425 | static inline void sk_wmem_free_skb(struct sock *sk, struct sk_buff *skb) | |
1426 | { | |
3ab224be HA |
1427 | sock_set_flag(sk, SOCK_QUEUE_SHRUNK); |
1428 | sk->sk_wmem_queued -= skb->truesize; | |
1429 | sk_mem_uncharge(sk, skb->truesize); | |
1430 | __kfree_skb(skb); | |
d80d99d6 HX |
1431 | } |
1432 | ||
c3f9b018 ED |
1433 | static inline void sock_release_ownership(struct sock *sk) |
1434 | { | |
61881cfb HFS |
1435 | if (sk->sk_lock.owned) { |
1436 | sk->sk_lock.owned = 0; | |
1437 | ||
1438 | /* The sk_lock has mutex_unlock() semantics: */ | |
1439 | mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_); | |
1440 | } | |
c3f9b018 ED |
1441 | } |
1442 | ||
ed07536e PZ |
1443 | /* |
1444 | * Macro so as to not evaluate some arguments when | |
1445 | * lockdep is not enabled. | |
1446 | * | |
1447 | * Mark both the sk_lock and the sk_lock.slock as a | |
1448 | * per-address-family lock class. | |
1449 | */ | |
dc6b9b78 | 1450 | #define sock_lock_init_class_and_name(sk, sname, skey, name, key) \ |
ed07536e | 1451 | do { \ |
e8f6fbf6 | 1452 | sk->sk_lock.owned = 0; \ |
ed07536e PZ |
1453 | init_waitqueue_head(&sk->sk_lock.wq); \ |
1454 | spin_lock_init(&(sk)->sk_lock.slock); \ | |
1455 | debug_check_no_locks_freed((void *)&(sk)->sk_lock, \ | |
1456 | sizeof((sk)->sk_lock)); \ | |
1457 | lockdep_set_class_and_name(&(sk)->sk_lock.slock, \ | |
dc6b9b78 | 1458 | (skey), (sname)); \ |
ed07536e PZ |
1459 | lockdep_init_map(&(sk)->sk_lock.dep_map, (name), (key), 0); \ |
1460 | } while (0) | |
1461 | ||
b33b0a1b | 1462 | #ifdef CONFIG_LOCKDEP |
05b93801 | 1463 | static inline bool lockdep_sock_is_held(const struct sock *sk) |
1e1d04e6 | 1464 | { |
1e1d04e6 HFS |
1465 | return lockdep_is_held(&sk->sk_lock) || |
1466 | lockdep_is_held(&sk->sk_lock.slock); | |
1467 | } | |
b33b0a1b | 1468 | #endif |
1e1d04e6 | 1469 | |
69336bd2 | 1470 | void lock_sock_nested(struct sock *sk, int subclass); |
fcc70d5f PZ |
1471 | |
1472 | static inline void lock_sock(struct sock *sk) | |
1473 | { | |
1474 | lock_sock_nested(sk, 0); | |
1475 | } | |
1476 | ||
69336bd2 | 1477 | void release_sock(struct sock *sk); |
1da177e4 LT |
1478 | |
1479 | /* BH context may only use the following locking interface. */ | |
1480 | #define bh_lock_sock(__sk) spin_lock(&((__sk)->sk_lock.slock)) | |
c6366184 IM |
1481 | #define bh_lock_sock_nested(__sk) \ |
1482 | spin_lock_nested(&((__sk)->sk_lock.slock), \ | |
1483 | SINGLE_DEPTH_NESTING) | |
1da177e4 LT |
1484 | #define bh_unlock_sock(__sk) spin_unlock(&((__sk)->sk_lock.slock)) |
1485 | ||
69336bd2 | 1486 | bool lock_sock_fast(struct sock *sk); |
8a74ad60 ED |
1487 | /** |
1488 | * unlock_sock_fast - complement of lock_sock_fast | |
1489 | * @sk: socket | |
1490 | * @slow: slow mode | |
1491 | * | |
1492 | * fast unlock socket for user context. | |
1493 | * If slow mode is on, we call regular release_sock() | |
1494 | */ | |
1495 | static inline void unlock_sock_fast(struct sock *sk, bool slow) | |
4b0b72f7 | 1496 | { |
8a74ad60 ED |
1497 | if (slow) |
1498 | release_sock(sk); | |
1499 | else | |
1500 | spin_unlock_bh(&sk->sk_lock.slock); | |
4b0b72f7 ED |
1501 | } |
1502 | ||
fafc4e1e HFS |
1503 | /* Used by processes to "lock" a socket state, so that |
1504 | * interrupts and bottom half handlers won't change it | |
1505 | * from under us. It essentially blocks any incoming | |
1506 | * packets, so that we won't get any new data or any | |
1507 | * packets that change the state of the socket. | |
1508 | * | |
1509 | * While locked, BH processing will add new packets to | |
1510 | * the backlog queue. This queue is processed by the | |
1511 | * owner of the socket lock right before it is released. | |
1512 | * | |
1513 | * Since ~2.3.5 it is also exclusive sleep lock serializing | |
1514 | * accesses from user process context. | |
1515 | */ | |
1516 | ||
46cc6e49 | 1517 | static inline void sock_owned_by_me(const struct sock *sk) |
fafc4e1e HFS |
1518 | { |
1519 | #ifdef CONFIG_LOCKDEP | |
5e91f6ce | 1520 | WARN_ON_ONCE(!lockdep_sock_is_held(sk) && debug_locks); |
fafc4e1e | 1521 | #endif |
46cc6e49 ED |
1522 | } |
1523 | ||
1524 | static inline bool sock_owned_by_user(const struct sock *sk) | |
1525 | { | |
1526 | sock_owned_by_me(sk); | |
fafc4e1e HFS |
1527 | return sk->sk_lock.owned; |
1528 | } | |
1529 | ||
602f7a27 TH |
1530 | static inline bool sock_owned_by_user_nocheck(const struct sock *sk) |
1531 | { | |
1532 | return sk->sk_lock.owned; | |
1533 | } | |
1534 | ||
fafc4e1e HFS |
1535 | /* no reclassification while locks are held */ |
1536 | static inline bool sock_allow_reclassification(const struct sock *csk) | |
1537 | { | |
1538 | struct sock *sk = (struct sock *)csk; | |
1539 | ||
1540 | return !sk->sk_lock.owned && !spin_is_locked(&sk->sk_lock.slock); | |
1541 | } | |
4b0b72f7 | 1542 | |
69336bd2 | 1543 | struct sock *sk_alloc(struct net *net, int family, gfp_t priority, |
11aa9c28 | 1544 | struct proto *prot, int kern); |
69336bd2 | 1545 | void sk_free(struct sock *sk); |
eb4cb008 | 1546 | void sk_destruct(struct sock *sk); |
69336bd2 | 1547 | struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority); |
94352d45 | 1548 | void sk_free_unlock_clone(struct sock *sk); |
69336bd2 JP |
1549 | |
1550 | struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force, | |
1551 | gfp_t priority); | |
1d2077ac | 1552 | void __sock_wfree(struct sk_buff *skb); |
69336bd2 | 1553 | void sock_wfree(struct sk_buff *skb); |
98ba0bd5 WB |
1554 | struct sk_buff *sock_omalloc(struct sock *sk, unsigned long size, |
1555 | gfp_t priority); | |
69336bd2 JP |
1556 | void skb_orphan_partial(struct sk_buff *skb); |
1557 | void sock_rfree(struct sk_buff *skb); | |
62bccb8c | 1558 | void sock_efree(struct sk_buff *skb); |
82eabd9e | 1559 | #ifdef CONFIG_INET |
69336bd2 | 1560 | void sock_edemux(struct sk_buff *skb); |
82eabd9e | 1561 | #else |
158f323b | 1562 | #define sock_edemux sock_efree |
82eabd9e | 1563 | #endif |
69336bd2 JP |
1564 | |
1565 | int sock_setsockopt(struct socket *sock, int level, int op, | |
1566 | char __user *optval, unsigned int optlen); | |
1567 | ||
1568 | int sock_getsockopt(struct socket *sock, int level, int op, | |
1569 | char __user *optval, int __user *optlen); | |
1570 | struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size, | |
1571 | int noblock, int *errcode); | |
1572 | struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len, | |
1573 | unsigned long data_len, int noblock, | |
1574 | int *errcode, int max_page_order); | |
1575 | void *sock_kmalloc(struct sock *sk, int size, gfp_t priority); | |
1576 | void sock_kfree_s(struct sock *sk, void *mem, int size); | |
79e88659 | 1577 | void sock_kzfree_s(struct sock *sk, void *mem, int size); |
69336bd2 | 1578 | void sk_send_sigurg(struct sock *sk); |
1da177e4 | 1579 | |
f28ea365 EJ |
1580 | struct sockcm_cookie { |
1581 | u32 mark; | |
3dd17e63 | 1582 | u16 tsflags; |
f28ea365 EJ |
1583 | }; |
1584 | ||
39771b12 WB |
1585 | int __sock_cmsg_send(struct sock *sk, struct msghdr *msg, struct cmsghdr *cmsg, |
1586 | struct sockcm_cookie *sockc); | |
f28ea365 EJ |
1587 | int sock_cmsg_send(struct sock *sk, struct msghdr *msg, |
1588 | struct sockcm_cookie *sockc); | |
1589 | ||
1da177e4 LT |
1590 | /* |
1591 | * Functions to fill in entries in struct proto_ops when a protocol | |
1592 | * does not implement a particular function. | |
1593 | */ | |
69336bd2 JP |
1594 | int sock_no_bind(struct socket *, struct sockaddr *, int); |
1595 | int sock_no_connect(struct socket *, struct sockaddr *, int, int); | |
1596 | int sock_no_socketpair(struct socket *, struct socket *); | |
cdfbabfb | 1597 | int sock_no_accept(struct socket *, struct socket *, int, bool); |
9b2c45d4 | 1598 | int sock_no_getname(struct socket *, struct sockaddr *, int); |
69336bd2 JP |
1599 | int sock_no_ioctl(struct socket *, unsigned int, unsigned long); |
1600 | int sock_no_listen(struct socket *, int); | |
1601 | int sock_no_shutdown(struct socket *, int); | |
1602 | int sock_no_getsockopt(struct socket *, int , int, char __user *, int __user *); | |
1603 | int sock_no_setsockopt(struct socket *, int, int, char __user *, unsigned int); | |
1b784140 | 1604 | int sock_no_sendmsg(struct socket *, struct msghdr *, size_t); |
306b13eb | 1605 | int sock_no_sendmsg_locked(struct sock *sk, struct msghdr *msg, size_t len); |
1b784140 | 1606 | int sock_no_recvmsg(struct socket *, struct msghdr *, size_t, int); |
69336bd2 JP |
1607 | int sock_no_mmap(struct file *file, struct socket *sock, |
1608 | struct vm_area_struct *vma); | |
1609 | ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, | |
1610 | size_t size, int flags); | |
306b13eb TH |
1611 | ssize_t sock_no_sendpage_locked(struct sock *sk, struct page *page, |
1612 | int offset, size_t size, int flags); | |
1da177e4 LT |
1613 | |
1614 | /* | |
1615 | * Functions to fill in entries in struct proto_ops when a protocol | |
1616 | * uses the inet style. | |
1617 | */ | |
69336bd2 | 1618 | int sock_common_getsockopt(struct socket *sock, int level, int optname, |
1da177e4 | 1619 | char __user *optval, int __user *optlen); |
1b784140 YX |
1620 | int sock_common_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, |
1621 | int flags); | |
69336bd2 | 1622 | int sock_common_setsockopt(struct socket *sock, int level, int optname, |
b7058842 | 1623 | char __user *optval, unsigned int optlen); |
69336bd2 | 1624 | int compat_sock_common_getsockopt(struct socket *sock, int level, |
3fdadf7d | 1625 | int optname, char __user *optval, int __user *optlen); |
69336bd2 | 1626 | int compat_sock_common_setsockopt(struct socket *sock, int level, |
b7058842 | 1627 | int optname, char __user *optval, unsigned int optlen); |
1da177e4 | 1628 | |
69336bd2 | 1629 | void sk_common_release(struct sock *sk); |
1da177e4 LT |
1630 | |
1631 | /* | |
1632 | * Default socket callbacks and setup code | |
1633 | */ | |
dc6b9b78 | 1634 | |
1da177e4 | 1635 | /* Initialise core socket variables */ |
69336bd2 | 1636 | void sock_init_data(struct socket *sock, struct sock *sk); |
1da177e4 | 1637 | |
1da177e4 LT |
1638 | /* |
1639 | * Socket reference counting postulates. | |
1640 | * | |
1641 | * * Each user of socket SHOULD hold a reference count. | |
1642 | * * Each access point to socket (an hash table bucket, reference from a list, | |
1643 | * running timer, skb in flight MUST hold a reference count. | |
1644 | * * When reference count hits 0, it means it will never increase back. | |
1645 | * * When reference count hits 0, it means that no references from | |
1646 | * outside exist to this socket and current process on current CPU | |
1647 | * is last user and may/should destroy this socket. | |
1648 | * * sk_free is called from any context: process, BH, IRQ. When | |
1649 | * it is called, socket has no references from outside -> sk_free | |
1650 | * may release descendant resources allocated by the socket, but | |
1651 | * to the time when it is called, socket is NOT referenced by any | |
1652 | * hash tables, lists etc. | |
1653 | * * Packets, delivered from outside (from network or from another process) | |
1654 | * and enqueued on receive/error queues SHOULD NOT grab reference count, | |
1655 | * when they sit in queue. Otherwise, packets will leak to hole, when | |
1656 | * socket is looked up by one cpu and unhasing is made by another CPU. | |
1657 | * It is true for udp/raw, netlink (leak to receive and error queues), tcp | |
1658 | * (leak to backlog). Packet socket does all the processing inside | |
1659 | * BR_NETPROTO_LOCK, so that it has not this race condition. UNIX sockets | |
1660 | * use separate SMP lock, so that they are prone too. | |
1661 | */ | |
1662 | ||
1663 | /* Ungrab socket and destroy it, if it was the last reference. */ | |
1664 | static inline void sock_put(struct sock *sk) | |
1665 | { | |
41c6d650 | 1666 | if (refcount_dec_and_test(&sk->sk_refcnt)) |
1da177e4 LT |
1667 | sk_free(sk); |
1668 | } | |
05dbc7b5 | 1669 | /* Generic version of sock_put(), dealing with all sockets |
41b822c5 | 1670 | * (TCP_TIMEWAIT, TCP_NEW_SYN_RECV, ESTABLISHED...) |
05dbc7b5 ED |
1671 | */ |
1672 | void sock_gen_put(struct sock *sk); | |
1da177e4 | 1673 | |
4f0c40d9 | 1674 | int __sk_receive_skb(struct sock *sk, struct sk_buff *skb, const int nested, |
c3f24cfb | 1675 | unsigned int trim_cap, bool refcounted); |
4f0c40d9 WB |
1676 | static inline int sk_receive_skb(struct sock *sk, struct sk_buff *skb, |
1677 | const int nested) | |
1678 | { | |
c3f24cfb | 1679 | return __sk_receive_skb(sk, skb, nested, 1, true); |
4f0c40d9 | 1680 | } |
25995ff5 | 1681 | |
e022f0b4 KK |
1682 | static inline void sk_tx_queue_set(struct sock *sk, int tx_queue) |
1683 | { | |
755c31cd AN |
1684 | /* sk_tx_queue_mapping accept only upto a 16-bit value */ |
1685 | if (WARN_ON_ONCE((unsigned short)tx_queue >= USHRT_MAX)) | |
1686 | return; | |
e022f0b4 KK |
1687 | sk->sk_tx_queue_mapping = tx_queue; |
1688 | } | |
1689 | ||
755c31cd AN |
1690 | #define NO_QUEUE_MAPPING USHRT_MAX |
1691 | ||
e022f0b4 KK |
1692 | static inline void sk_tx_queue_clear(struct sock *sk) |
1693 | { | |
755c31cd | 1694 | sk->sk_tx_queue_mapping = NO_QUEUE_MAPPING; |
e022f0b4 KK |
1695 | } |
1696 | ||
1697 | static inline int sk_tx_queue_get(const struct sock *sk) | |
1698 | { | |
755c31cd AN |
1699 | if (sk && sk->sk_tx_queue_mapping != NO_QUEUE_MAPPING) |
1700 | return sk->sk_tx_queue_mapping; | |
1701 | ||
1702 | return -1; | |
e022f0b4 KK |
1703 | } |
1704 | ||
972692e0 DM |
1705 | static inline void sk_set_socket(struct sock *sk, struct socket *sock) |
1706 | { | |
e022f0b4 | 1707 | sk_tx_queue_clear(sk); |
972692e0 DM |
1708 | sk->sk_socket = sock; |
1709 | } | |
1710 | ||
aa395145 ED |
1711 | static inline wait_queue_head_t *sk_sleep(struct sock *sk) |
1712 | { | |
eaefd110 ED |
1713 | BUILD_BUG_ON(offsetof(struct socket_wq, wait) != 0); |
1714 | return &rcu_dereference_raw(sk->sk_wq)->wait; | |
aa395145 | 1715 | } |
1da177e4 LT |
1716 | /* Detach socket from process context. |
1717 | * Announce socket dead, detach it from wait queue and inode. | |
1718 | * Note that parent inode held reference count on this struct sock, | |
1719 | * we do not release it in this function, because protocol | |
1720 | * probably wants some additional cleanups or even continuing | |
1721 | * to work with this socket (TCP). | |
1722 | */ | |
1723 | static inline void sock_orphan(struct sock *sk) | |
1724 | { | |
1725 | write_lock_bh(&sk->sk_callback_lock); | |
1726 | sock_set_flag(sk, SOCK_DEAD); | |
972692e0 | 1727 | sk_set_socket(sk, NULL); |
43815482 | 1728 | sk->sk_wq = NULL; |
1da177e4 LT |
1729 | write_unlock_bh(&sk->sk_callback_lock); |
1730 | } | |
1731 | ||
1732 | static inline void sock_graft(struct sock *sk, struct socket *parent) | |
1733 | { | |
0ffdaf5b | 1734 | WARN_ON(parent->sk); |
1da177e4 | 1735 | write_lock_bh(&sk->sk_callback_lock); |
eaefd110 | 1736 | sk->sk_wq = parent->wq; |
1da177e4 | 1737 | parent->sk = sk; |
972692e0 | 1738 | sk_set_socket(sk, parent); |
86741ec2 | 1739 | sk->sk_uid = SOCK_INODE(parent)->i_uid; |
4237c75c | 1740 | security_sock_graft(sk, parent); |
1da177e4 LT |
1741 | write_unlock_bh(&sk->sk_callback_lock); |
1742 | } | |
1743 | ||
69336bd2 JP |
1744 | kuid_t sock_i_uid(struct sock *sk); |
1745 | unsigned long sock_i_ino(struct sock *sk); | |
1da177e4 | 1746 | |
86741ec2 LC |
1747 | static inline kuid_t sock_net_uid(const struct net *net, const struct sock *sk) |
1748 | { | |
1749 | return sk ? sk->sk_uid : make_kuid(net->user_ns, 0); | |
1750 | } | |
1751 | ||
58d607d3 | 1752 | static inline u32 net_tx_rndhash(void) |
877d1f62 | 1753 | { |
58d607d3 ED |
1754 | u32 v = prandom_u32(); |
1755 | ||
1756 | return v ?: 1; | |
1757 | } | |
877d1f62 | 1758 | |
58d607d3 ED |
1759 | static inline void sk_set_txhash(struct sock *sk) |
1760 | { | |
1761 | sk->sk_txhash = net_tx_rndhash(); | |
877d1f62 TH |
1762 | } |
1763 | ||
265f94ff TH |
1764 | static inline void sk_rethink_txhash(struct sock *sk) |
1765 | { | |
1766 | if (sk->sk_txhash) | |
1767 | sk_set_txhash(sk); | |
1768 | } | |
1769 | ||
1da177e4 LT |
1770 | static inline struct dst_entry * |
1771 | __sk_dst_get(struct sock *sk) | |
1772 | { | |
1e1d04e6 HFS |
1773 | return rcu_dereference_check(sk->sk_dst_cache, |
1774 | lockdep_sock_is_held(sk)); | |
1da177e4 LT |
1775 | } |
1776 | ||
1777 | static inline struct dst_entry * | |
1778 | sk_dst_get(struct sock *sk) | |
1779 | { | |
1780 | struct dst_entry *dst; | |
1781 | ||
b6c6712a ED |
1782 | rcu_read_lock(); |
1783 | dst = rcu_dereference(sk->sk_dst_cache); | |
f8864972 ED |
1784 | if (dst && !atomic_inc_not_zero(&dst->__refcnt)) |
1785 | dst = NULL; | |
b6c6712a | 1786 | rcu_read_unlock(); |
1da177e4 LT |
1787 | return dst; |
1788 | } | |
1789 | ||
b6c6712a ED |
1790 | static inline void dst_negative_advice(struct sock *sk) |
1791 | { | |
1792 | struct dst_entry *ndst, *dst = __sk_dst_get(sk); | |
1793 | ||
265f94ff TH |
1794 | sk_rethink_txhash(sk); |
1795 | ||
b6c6712a ED |
1796 | if (dst && dst->ops->negative_advice) { |
1797 | ndst = dst->ops->negative_advice(dst); | |
1798 | ||
1799 | if (ndst != dst) { | |
1800 | rcu_assign_pointer(sk->sk_dst_cache, ndst); | |
0a6957e7 | 1801 | sk_tx_queue_clear(sk); |
9b8805a3 | 1802 | sk->sk_dst_pending_confirm = 0; |
b6c6712a ED |
1803 | } |
1804 | } | |
1805 | } | |
1806 | ||
1da177e4 LT |
1807 | static inline void |
1808 | __sk_dst_set(struct sock *sk, struct dst_entry *dst) | |
1809 | { | |
1810 | struct dst_entry *old_dst; | |
1811 | ||
e022f0b4 | 1812 | sk_tx_queue_clear(sk); |
9b8805a3 | 1813 | sk->sk_dst_pending_confirm = 0; |
95964c6d ED |
1814 | old_dst = rcu_dereference_protected(sk->sk_dst_cache, |
1815 | lockdep_sock_is_held(sk)); | |
b6c6712a | 1816 | rcu_assign_pointer(sk->sk_dst_cache, dst); |
1da177e4 LT |
1817 | dst_release(old_dst); |
1818 | } | |
1819 | ||
1820 | static inline void | |
1821 | sk_dst_set(struct sock *sk, struct dst_entry *dst) | |
1822 | { | |
7f502361 ED |
1823 | struct dst_entry *old_dst; |
1824 | ||
1825 | sk_tx_queue_clear(sk); | |
9b8805a3 | 1826 | sk->sk_dst_pending_confirm = 0; |
5925a055 | 1827 | old_dst = xchg((__force struct dst_entry **)&sk->sk_dst_cache, dst); |
7f502361 | 1828 | dst_release(old_dst); |
1da177e4 LT |
1829 | } |
1830 | ||
1831 | static inline void | |
1832 | __sk_dst_reset(struct sock *sk) | |
1833 | { | |
b6c6712a | 1834 | __sk_dst_set(sk, NULL); |
1da177e4 LT |
1835 | } |
1836 | ||
1837 | static inline void | |
1838 | sk_dst_reset(struct sock *sk) | |
1839 | { | |
7f502361 | 1840 | sk_dst_set(sk, NULL); |
1da177e4 LT |
1841 | } |
1842 | ||
69336bd2 | 1843 | struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie); |
1da177e4 | 1844 | |
69336bd2 | 1845 | struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie); |
1da177e4 | 1846 | |
9b8805a3 JA |
1847 | static inline void sk_dst_confirm(struct sock *sk) |
1848 | { | |
1849 | if (!sk->sk_dst_pending_confirm) | |
1850 | sk->sk_dst_pending_confirm = 1; | |
1851 | } | |
1852 | ||
4ff06203 JA |
1853 | static inline void sock_confirm_neigh(struct sk_buff *skb, struct neighbour *n) |
1854 | { | |
1855 | if (skb_get_dst_pending_confirm(skb)) { | |
1856 | struct sock *sk = skb->sk; | |
1857 | unsigned long now = jiffies; | |
1858 | ||
1859 | /* avoid dirtying neighbour */ | |
1860 | if (n->confirmed != now) | |
1861 | n->confirmed = now; | |
1862 | if (sk && sk->sk_dst_pending_confirm) | |
1863 | sk->sk_dst_pending_confirm = 0; | |
1864 | } | |
1865 | } | |
1866 | ||
f60e5990 | 1867 | bool sk_mc_loop(struct sock *sk); |
1868 | ||
dc6b9b78 | 1869 | static inline bool sk_can_gso(const struct sock *sk) |
bcd76111 HX |
1870 | { |
1871 | return net_gso_ok(sk->sk_route_caps, sk->sk_gso_type); | |
1872 | } | |
1873 | ||
69336bd2 | 1874 | void sk_setup_caps(struct sock *sk, struct dst_entry *dst); |
6cbb0df7 | 1875 | |
c8f44aff | 1876 | static inline void sk_nocaps_add(struct sock *sk, netdev_features_t flags) |
a465419b ED |
1877 | { |
1878 | sk->sk_route_nocaps |= flags; | |
1879 | sk->sk_route_caps &= ~flags; | |
1880 | } | |
1881 | ||
c6e1a0d1 | 1882 | static inline int skb_do_copy_data_nocache(struct sock *sk, struct sk_buff *skb, |
57be5bda | 1883 | struct iov_iter *from, char *to, |
912d398d | 1884 | int copy, int offset) |
c6e1a0d1 TH |
1885 | { |
1886 | if (skb->ip_summed == CHECKSUM_NONE) { | |
57be5bda | 1887 | __wsum csum = 0; |
15e6cb46 | 1888 | if (!csum_and_copy_from_iter_full(to, copy, &csum, from)) |
57be5bda | 1889 | return -EFAULT; |
912d398d | 1890 | skb->csum = csum_block_add(skb->csum, csum, offset); |
c6e1a0d1 | 1891 | } else if (sk->sk_route_caps & NETIF_F_NOCACHE_COPY) { |
15e6cb46 | 1892 | if (!copy_from_iter_full_nocache(to, copy, from)) |
c6e1a0d1 | 1893 | return -EFAULT; |
15e6cb46 | 1894 | } else if (!copy_from_iter_full(to, copy, from)) |
c6e1a0d1 TH |
1895 | return -EFAULT; |
1896 | ||
1897 | return 0; | |
1898 | } | |
1899 | ||
1900 | static inline int skb_add_data_nocache(struct sock *sk, struct sk_buff *skb, | |
57be5bda | 1901 | struct iov_iter *from, int copy) |
c6e1a0d1 | 1902 | { |
912d398d | 1903 | int err, offset = skb->len; |
c6e1a0d1 | 1904 | |
912d398d WY |
1905 | err = skb_do_copy_data_nocache(sk, skb, from, skb_put(skb, copy), |
1906 | copy, offset); | |
c6e1a0d1 | 1907 | if (err) |
912d398d | 1908 | __skb_trim(skb, offset); |
c6e1a0d1 TH |
1909 | |
1910 | return err; | |
1911 | } | |
1912 | ||
57be5bda | 1913 | static inline int skb_copy_to_page_nocache(struct sock *sk, struct iov_iter *from, |
c6e1a0d1 TH |
1914 | struct sk_buff *skb, |
1915 | struct page *page, | |
1916 | int off, int copy) | |
1917 | { | |
1918 | int err; | |
1919 | ||
912d398d WY |
1920 | err = skb_do_copy_data_nocache(sk, skb, from, page_address(page) + off, |
1921 | copy, skb->len); | |
c6e1a0d1 TH |
1922 | if (err) |
1923 | return err; | |
1924 | ||
1925 | skb->len += copy; | |
1926 | skb->data_len += copy; | |
1927 | skb->truesize += copy; | |
1928 | sk->sk_wmem_queued += copy; | |
1929 | sk_mem_charge(sk, copy); | |
1930 | return 0; | |
1931 | } | |
1932 | ||
c564039f ED |
1933 | /** |
1934 | * sk_wmem_alloc_get - returns write allocations | |
1935 | * @sk: socket | |
1936 | * | |
1937 | * Returns sk_wmem_alloc minus initial offset of one | |
1938 | */ | |
1939 | static inline int sk_wmem_alloc_get(const struct sock *sk) | |
1940 | { | |
14afee4b | 1941 | return refcount_read(&sk->sk_wmem_alloc) - 1; |
c564039f ED |
1942 | } |
1943 | ||
1944 | /** | |
1945 | * sk_rmem_alloc_get - returns read allocations | |
1946 | * @sk: socket | |
1947 | * | |
1948 | * Returns sk_rmem_alloc | |
1949 | */ | |
1950 | static inline int sk_rmem_alloc_get(const struct sock *sk) | |
1951 | { | |
1952 | return atomic_read(&sk->sk_rmem_alloc); | |
1953 | } | |
1954 | ||
1955 | /** | |
1956 | * sk_has_allocations - check if allocations are outstanding | |
1957 | * @sk: socket | |
1958 | * | |
1959 | * Returns true if socket has write or read allocations | |
1960 | */ | |
dc6b9b78 | 1961 | static inline bool sk_has_allocations(const struct sock *sk) |
c564039f ED |
1962 | { |
1963 | return sk_wmem_alloc_get(sk) || sk_rmem_alloc_get(sk); | |
1964 | } | |
1965 | ||
a57de0b4 | 1966 | /** |
1ce0bf50 | 1967 | * skwq_has_sleeper - check if there are any waiting processes |
acfbe96a | 1968 | * @wq: struct socket_wq |
a57de0b4 | 1969 | * |
43815482 | 1970 | * Returns true if socket_wq has waiting processes |
a57de0b4 | 1971 | * |
1ce0bf50 | 1972 | * The purpose of the skwq_has_sleeper and sock_poll_wait is to wrap the memory |
a57de0b4 JO |
1973 | * barrier call. They were added due to the race found within the tcp code. |
1974 | * | |
d651983d | 1975 | * Consider following tcp code paths:: |
a57de0b4 | 1976 | * |
d651983d MCC |
1977 | * CPU1 CPU2 |
1978 | * sys_select receive packet | |
a57de0b4 JO |
1979 | * ... ... |
1980 | * __add_wait_queue update tp->rcv_nxt | |
1981 | * ... ... | |
1982 | * tp->rcv_nxt check sock_def_readable | |
1983 | * ... { | |
43815482 ED |
1984 | * schedule rcu_read_lock(); |
1985 | * wq = rcu_dereference(sk->sk_wq); | |
1986 | * if (wq && waitqueue_active(&wq->wait)) | |
1987 | * wake_up_interruptible(&wq->wait) | |
a57de0b4 JO |
1988 | * ... |
1989 | * } | |
1990 | * | |
1991 | * The race for tcp fires when the __add_wait_queue changes done by CPU1 stay | |
1992 | * in its cache, and so does the tp->rcv_nxt update on CPU2 side. The CPU1 | |
1993 | * could then endup calling schedule and sleep forever if there are no more | |
1994 | * data on the socket. | |
ad462769 | 1995 | * |
a57de0b4 | 1996 | */ |
1ce0bf50 | 1997 | static inline bool skwq_has_sleeper(struct socket_wq *wq) |
a57de0b4 | 1998 | { |
1ce0bf50 | 1999 | return wq && wq_has_sleeper(&wq->wait); |
a57de0b4 JO |
2000 | } |
2001 | ||
2002 | /** | |
2003 | * sock_poll_wait - place memory barrier behind the poll_wait call. | |
2004 | * @filp: file | |
2005 | * @wait_address: socket wait queue | |
2006 | * @p: poll_table | |
2007 | * | |
43815482 | 2008 | * See the comments in the wq_has_sleeper function. |
a57de0b4 JO |
2009 | */ |
2010 | static inline void sock_poll_wait(struct file *filp, | |
2011 | wait_queue_head_t *wait_address, poll_table *p) | |
2012 | { | |
626cf236 | 2013 | if (!poll_does_not_wait(p) && wait_address) { |
a57de0b4 | 2014 | poll_wait(filp, wait_address, p); |
dc6b9b78 | 2015 | /* We need to be sure we are in sync with the |
a57de0b4 JO |
2016 | * socket flags modification. |
2017 | * | |
43815482 | 2018 | * This memory barrier is paired in the wq_has_sleeper. |
dc6b9b78 | 2019 | */ |
a57de0b4 JO |
2020 | smp_mb(); |
2021 | } | |
2022 | } | |
2023 | ||
b73c3d0e TH |
2024 | static inline void skb_set_hash_from_sk(struct sk_buff *skb, struct sock *sk) |
2025 | { | |
2026 | if (sk->sk_txhash) { | |
2027 | skb->l4_hash = 1; | |
2028 | skb->hash = sk->sk_txhash; | |
2029 | } | |
2030 | } | |
2031 | ||
9e17f8a4 ED |
2032 | void skb_set_owner_w(struct sk_buff *skb, struct sock *sk); |
2033 | ||
1da177e4 | 2034 | /* |
dc6b9b78 | 2035 | * Queue a received datagram if it will fit. Stream and sequenced |
1da177e4 LT |
2036 | * protocols can't normally use this as they need to fit buffers in |
2037 | * and play with them. | |
2038 | * | |
dc6b9b78 | 2039 | * Inlined as it's very short and called for pretty much every |
1da177e4 LT |
2040 | * packet ever received. |
2041 | */ | |
1da177e4 LT |
2042 | static inline void skb_set_owner_r(struct sk_buff *skb, struct sock *sk) |
2043 | { | |
d55d87fd | 2044 | skb_orphan(skb); |
1da177e4 LT |
2045 | skb->sk = sk; |
2046 | skb->destructor = sock_rfree; | |
2047 | atomic_add(skb->truesize, &sk->sk_rmem_alloc); | |
3ab224be | 2048 | sk_mem_charge(sk, skb->truesize); |
1da177e4 LT |
2049 | } |
2050 | ||
69336bd2 JP |
2051 | void sk_reset_timer(struct sock *sk, struct timer_list *timer, |
2052 | unsigned long expires); | |
1da177e4 | 2053 | |
69336bd2 | 2054 | void sk_stop_timer(struct sock *sk, struct timer_list *timer); |
1da177e4 | 2055 | |
65101aec PA |
2056 | int __sk_queue_drop_skb(struct sock *sk, struct sk_buff_head *sk_queue, |
2057 | struct sk_buff *skb, unsigned int flags, | |
69629464 ED |
2058 | void (*destructor)(struct sock *sk, |
2059 | struct sk_buff *skb)); | |
e6afc8ac | 2060 | int __sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb); |
69336bd2 | 2061 | int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb); |
1da177e4 | 2062 | |
69336bd2 | 2063 | int sock_queue_err_skb(struct sock *sk, struct sk_buff *skb); |
364a9e93 | 2064 | struct sk_buff *sock_dequeue_err_skb(struct sock *sk); |
1da177e4 LT |
2065 | |
2066 | /* | |
2067 | * Recover an error report and clear atomically | |
2068 | */ | |
dc6b9b78 | 2069 | |
1da177e4 LT |
2070 | static inline int sock_error(struct sock *sk) |
2071 | { | |
c1cbe4b7 BL |
2072 | int err; |
2073 | if (likely(!sk->sk_err)) | |
2074 | return 0; | |
2075 | err = xchg(&sk->sk_err, 0); | |
1da177e4 LT |
2076 | return -err; |
2077 | } | |
2078 | ||
2079 | static inline unsigned long sock_wspace(struct sock *sk) | |
2080 | { | |
2081 | int amt = 0; | |
2082 | ||
2083 | if (!(sk->sk_shutdown & SEND_SHUTDOWN)) { | |
14afee4b | 2084 | amt = sk->sk_sndbuf - refcount_read(&sk->sk_wmem_alloc); |
dc6b9b78 | 2085 | if (amt < 0) |
1da177e4 LT |
2086 | amt = 0; |
2087 | } | |
2088 | return amt; | |
2089 | } | |
2090 | ||
ceb5d58b ED |
2091 | /* Note: |
2092 | * We use sk->sk_wq_raw, from contexts knowing this | |
2093 | * pointer is not NULL and cannot disappear/change. | |
2094 | */ | |
9cd3e072 | 2095 | static inline void sk_set_bit(int nr, struct sock *sk) |
1da177e4 | 2096 | { |
4be73522 ED |
2097 | if ((nr == SOCKWQ_ASYNC_NOSPACE || nr == SOCKWQ_ASYNC_WAITDATA) && |
2098 | !sock_flag(sk, SOCK_FASYNC)) | |
9317bb69 ED |
2099 | return; |
2100 | ||
ceb5d58b | 2101 | set_bit(nr, &sk->sk_wq_raw->flags); |
9cd3e072 ED |
2102 | } |
2103 | ||
2104 | static inline void sk_clear_bit(int nr, struct sock *sk) | |
2105 | { | |
4be73522 ED |
2106 | if ((nr == SOCKWQ_ASYNC_NOSPACE || nr == SOCKWQ_ASYNC_WAITDATA) && |
2107 | !sock_flag(sk, SOCK_FASYNC)) | |
9317bb69 ED |
2108 | return; |
2109 | ||
ceb5d58b | 2110 | clear_bit(nr, &sk->sk_wq_raw->flags); |
9cd3e072 ED |
2111 | } |
2112 | ||
ceb5d58b | 2113 | static inline void sk_wake_async(const struct sock *sk, int how, int band) |
1da177e4 | 2114 | { |
ceb5d58b ED |
2115 | if (sock_flag(sk, SOCK_FASYNC)) { |
2116 | rcu_read_lock(); | |
2117 | sock_wake_async(rcu_dereference(sk->sk_wq), how, band); | |
2118 | rcu_read_unlock(); | |
2119 | } | |
1da177e4 LT |
2120 | } |
2121 | ||
eea86af6 DB |
2122 | /* Since sk_{r,w}mem_alloc sums skb->truesize, even a small frame might |
2123 | * need sizeof(sk_buff) + MTU + padding, unless net driver perform copybreak. | |
2124 | * Note: for send buffers, TCP works better if we can build two skbs at | |
2125 | * minimum. | |
7a91b434 | 2126 | */ |
9eb5bf83 | 2127 | #define TCP_SKB_MIN_TRUESIZE (2048 + SKB_DATA_ALIGN(sizeof(struct sk_buff))) |
eea86af6 DB |
2128 | |
2129 | #define SOCK_MIN_SNDBUF (TCP_SKB_MIN_TRUESIZE * 2) | |
2130 | #define SOCK_MIN_RCVBUF TCP_SKB_MIN_TRUESIZE | |
1da177e4 LT |
2131 | |
2132 | static inline void sk_stream_moderate_sndbuf(struct sock *sk) | |
2133 | { | |
2134 | if (!(sk->sk_userlocks & SOCK_SNDBUF_LOCK)) { | |
8df09ea3 | 2135 | sk->sk_sndbuf = min(sk->sk_sndbuf, sk->sk_wmem_queued >> 1); |
eea86af6 | 2136 | sk->sk_sndbuf = max_t(u32, sk->sk_sndbuf, SOCK_MIN_SNDBUF); |
1da177e4 LT |
2137 | } |
2138 | } | |
2139 | ||
eb934478 ED |
2140 | struct sk_buff *sk_stream_alloc_skb(struct sock *sk, int size, gfp_t gfp, |
2141 | bool force_schedule); | |
1da177e4 | 2142 | |
5640f768 ED |
2143 | /** |
2144 | * sk_page_frag - return an appropriate page_frag | |
2145 | * @sk: socket | |
2146 | * | |
2147 | * If socket allocation mode allows current thread to sleep, it means its | |
2148 | * safe to use the per task page_frag instead of the per socket one. | |
2149 | */ | |
2150 | static inline struct page_frag *sk_page_frag(struct sock *sk) | |
1da177e4 | 2151 | { |
d0164adc | 2152 | if (gfpflags_allow_blocking(sk->sk_allocation)) |
5640f768 | 2153 | return ¤t->task_frag; |
1da177e4 | 2154 | |
5640f768 | 2155 | return &sk->sk_frag; |
1da177e4 LT |
2156 | } |
2157 | ||
69336bd2 | 2158 | bool sk_page_frag_refill(struct sock *sk, struct page_frag *pfrag); |
5640f768 | 2159 | |
2c3682f0 | 2160 | int sk_alloc_sg(struct sock *sk, int len, struct scatterlist *sg, |
8c05dbf0 | 2161 | int sg_start, int *sg_curr, unsigned int *sg_size, |
2c3682f0 JF |
2162 | int first_coalesce); |
2163 | ||
1da177e4 LT |
2164 | /* |
2165 | * Default write policy as shown to user space via poll/select/SIGIO | |
2166 | */ | |
dc6b9b78 | 2167 | static inline bool sock_writeable(const struct sock *sk) |
1da177e4 | 2168 | { |
14afee4b | 2169 | return refcount_read(&sk->sk_wmem_alloc) < (sk->sk_sndbuf >> 1); |
1da177e4 LT |
2170 | } |
2171 | ||
dd0fc66f | 2172 | static inline gfp_t gfp_any(void) |
1da177e4 | 2173 | { |
99709372 | 2174 | return in_softirq() ? GFP_ATOMIC : GFP_KERNEL; |
1da177e4 LT |
2175 | } |
2176 | ||
dc6b9b78 | 2177 | static inline long sock_rcvtimeo(const struct sock *sk, bool noblock) |
1da177e4 LT |
2178 | { |
2179 | return noblock ? 0 : sk->sk_rcvtimeo; | |
2180 | } | |
2181 | ||
dc6b9b78 | 2182 | static inline long sock_sndtimeo(const struct sock *sk, bool noblock) |
1da177e4 LT |
2183 | { |
2184 | return noblock ? 0 : sk->sk_sndtimeo; | |
2185 | } | |
2186 | ||
2187 | static inline int sock_rcvlowat(const struct sock *sk, int waitall, int len) | |
2188 | { | |
2189 | return (waitall ? len : min_t(int, sk->sk_rcvlowat, len)) ? : 1; | |
2190 | } | |
2191 | ||
2192 | /* Alas, with timeout socket operations are not restartable. | |
2193 | * Compare this to poll(). | |
2194 | */ | |
2195 | static inline int sock_intr_errno(long timeo) | |
2196 | { | |
2197 | return timeo == MAX_SCHEDULE_TIMEOUT ? -ERESTARTSYS : -EINTR; | |
2198 | } | |
2199 | ||
744d5a3e EB |
2200 | struct sock_skb_cb { |
2201 | u32 dropcount; | |
2202 | }; | |
2203 | ||
2204 | /* Store sock_skb_cb at the end of skb->cb[] so protocol families | |
2205 | * using skb->cb[] would keep using it directly and utilize its | |
2206 | * alignement guarantee. | |
2207 | */ | |
2208 | #define SOCK_SKB_CB_OFFSET ((FIELD_SIZEOF(struct sk_buff, cb) - \ | |
2209 | sizeof(struct sock_skb_cb))) | |
2210 | ||
2211 | #define SOCK_SKB_CB(__skb) ((struct sock_skb_cb *)((__skb)->cb + \ | |
2212 | SOCK_SKB_CB_OFFSET)) | |
2213 | ||
b4772ef8 | 2214 | #define sock_skb_cb_check_size(size) \ |
744d5a3e | 2215 | BUILD_BUG_ON((size) > SOCK_SKB_CB_OFFSET) |
b4772ef8 | 2216 | |
3bc3b96f EB |
2217 | static inline void |
2218 | sock_skb_set_dropcount(const struct sock *sk, struct sk_buff *skb) | |
2219 | { | |
3665f381 ED |
2220 | SOCK_SKB_CB(skb)->dropcount = sock_flag(sk, SOCK_RXQ_OVFL) ? |
2221 | atomic_read(&sk->sk_drops) : 0; | |
3bc3b96f EB |
2222 | } |
2223 | ||
532182cd ED |
2224 | static inline void sk_drops_add(struct sock *sk, const struct sk_buff *skb) |
2225 | { | |
2226 | int segs = max_t(u16, 1, skb_shinfo(skb)->gso_segs); | |
2227 | ||
2228 | atomic_add(segs, &sk->sk_drops); | |
2229 | } | |
2230 | ||
69336bd2 JP |
2231 | void __sock_recv_timestamp(struct msghdr *msg, struct sock *sk, |
2232 | struct sk_buff *skb); | |
2233 | void __sock_recv_wifi_status(struct msghdr *msg, struct sock *sk, | |
2234 | struct sk_buff *skb); | |
92f37fd2 | 2235 | |
dc6b9b78 | 2236 | static inline void |
1da177e4 LT |
2237 | sock_recv_timestamp(struct msghdr *msg, struct sock *sk, struct sk_buff *skb) |
2238 | { | |
b7aa0bf7 | 2239 | ktime_t kt = skb->tstamp; |
20d49473 | 2240 | struct skb_shared_hwtstamps *hwtstamps = skb_hwtstamps(skb); |
a61bbcf2 | 2241 | |
20d49473 PO |
2242 | /* |
2243 | * generate control messages if | |
b9f40e21 | 2244 | * - receive time stamping in software requested |
20d49473 | 2245 | * - software time stamp available and wanted |
20d49473 | 2246 | * - hardware time stamps available and wanted |
20d49473 PO |
2247 | */ |
2248 | if (sock_flag(sk, SOCK_RCVTSTAMP) || | |
b9f40e21 | 2249 | (sk->sk_tsflags & SOF_TIMESTAMPING_RX_SOFTWARE) || |
2456e855 TG |
2250 | (kt && sk->sk_tsflags & SOF_TIMESTAMPING_SOFTWARE) || |
2251 | (hwtstamps->hwtstamp && | |
b9f40e21 | 2252 | (sk->sk_tsflags & SOF_TIMESTAMPING_RAW_HARDWARE))) |
92f37fd2 ED |
2253 | __sock_recv_timestamp(msg, sk, skb); |
2254 | else | |
b7aa0bf7 | 2255 | sk->sk_stamp = kt; |
6e3e939f JB |
2256 | |
2257 | if (sock_flag(sk, SOCK_WIFI_STATUS) && skb->wifi_acked_valid) | |
2258 | __sock_recv_wifi_status(msg, sk, skb); | |
1da177e4 LT |
2259 | } |
2260 | ||
69336bd2 JP |
2261 | void __sock_recv_ts_and_drops(struct msghdr *msg, struct sock *sk, |
2262 | struct sk_buff *skb); | |
767dd033 | 2263 | |
6c7c98ba | 2264 | #define SK_DEFAULT_STAMP (-1L * NSEC_PER_SEC) |
767dd033 ED |
2265 | static inline void sock_recv_ts_and_drops(struct msghdr *msg, struct sock *sk, |
2266 | struct sk_buff *skb) | |
2267 | { | |
2268 | #define FLAGS_TS_OR_DROPS ((1UL << SOCK_RXQ_OVFL) | \ | |
b9f40e21 WB |
2269 | (1UL << SOCK_RCVTSTAMP)) |
2270 | #define TSFLAGS_ANY (SOF_TIMESTAMPING_SOFTWARE | \ | |
2271 | SOF_TIMESTAMPING_RAW_HARDWARE) | |
767dd033 | 2272 | |
b9f40e21 | 2273 | if (sk->sk_flags & FLAGS_TS_OR_DROPS || sk->sk_tsflags & TSFLAGS_ANY) |
767dd033 | 2274 | __sock_recv_ts_and_drops(msg, sk, skb); |
d3fbff30 | 2275 | else if (unlikely(sock_flag(sk, SOCK_TIMESTAMP))) |
767dd033 | 2276 | sk->sk_stamp = skb->tstamp; |
6c7c98ba PA |
2277 | else if (unlikely(sk->sk_stamp == SK_DEFAULT_STAMP)) |
2278 | sk->sk_stamp = 0; | |
767dd033 | 2279 | } |
3b885787 | 2280 | |
c14ac945 | 2281 | void __sock_tx_timestamp(__u16 tsflags, __u8 *tx_flags); |
67cc0d40 | 2282 | |
20d49473 PO |
2283 | /** |
2284 | * sock_tx_timestamp - checks whether the outgoing packet is to be time stamped | |
20d49473 | 2285 | * @sk: socket sending this packet |
c14ac945 | 2286 | * @tsflags: timestamping flags to use |
140c55d4 ED |
2287 | * @tx_flags: completed with instructions for time stamping |
2288 | * | |
d651983d | 2289 | * Note: callers should take care of initial ``*tx_flags`` value (usually 0) |
20d49473 | 2290 | */ |
c14ac945 SHY |
2291 | static inline void sock_tx_timestamp(const struct sock *sk, __u16 tsflags, |
2292 | __u8 *tx_flags) | |
67cc0d40 | 2293 | { |
c14ac945 SHY |
2294 | if (unlikely(tsflags)) |
2295 | __sock_tx_timestamp(tsflags, tx_flags); | |
67cc0d40 WB |
2296 | if (unlikely(sock_flag(sk, SOCK_WIFI_STATUS))) |
2297 | *tx_flags |= SKBTX_WIFI_STATUS; | |
2298 | } | |
20d49473 | 2299 | |
1da177e4 LT |
2300 | /** |
2301 | * sk_eat_skb - Release a skb if it is no longer needed | |
4dc3b16b PP |
2302 | * @sk: socket to eat this skb from |
2303 | * @skb: socket buffer to eat | |
1da177e4 LT |
2304 | * |
2305 | * This routine must be called with interrupts disabled or with the socket | |
2306 | * locked so that the sk_buff queue operation is ok. | |
2307 | */ | |
7bced397 | 2308 | static inline void sk_eat_skb(struct sock *sk, struct sk_buff *skb) |
1da177e4 LT |
2309 | { |
2310 | __skb_unlink(skb, &sk->sk_receive_queue); | |
2311 | __kfree_skb(skb); | |
2312 | } | |
2313 | ||
3b1e0a65 YH |
2314 | static inline |
2315 | struct net *sock_net(const struct sock *sk) | |
2316 | { | |
c2d9ba9b | 2317 | return read_pnet(&sk->sk_net); |
3b1e0a65 YH |
2318 | } |
2319 | ||
2320 | static inline | |
f5aa23fd | 2321 | void sock_net_set(struct sock *sk, struct net *net) |
3b1e0a65 | 2322 | { |
c2d9ba9b | 2323 | write_pnet(&sk->sk_net, net); |
3b1e0a65 YH |
2324 | } |
2325 | ||
23542618 KK |
2326 | static inline struct sock *skb_steal_sock(struct sk_buff *skb) |
2327 | { | |
efc27f8c | 2328 | if (skb->sk) { |
23542618 KK |
2329 | struct sock *sk = skb->sk; |
2330 | ||
2331 | skb->destructor = NULL; | |
2332 | skb->sk = NULL; | |
2333 | return sk; | |
2334 | } | |
2335 | return NULL; | |
2336 | } | |
2337 | ||
1d0ab253 ED |
2338 | /* This helper checks if a socket is a full socket, |
2339 | * ie _not_ a timewait or request socket. | |
2340 | */ | |
2341 | static inline bool sk_fullsock(const struct sock *sk) | |
2342 | { | |
2343 | return (1 << sk->sk_state) & ~(TCPF_TIME_WAIT | TCPF_NEW_SYN_RECV); | |
2344 | } | |
2345 | ||
ebf4e808 IL |
2346 | /* Checks if this SKB belongs to an HW offloaded socket |
2347 | * and whether any SW fallbacks are required based on dev. | |
2348 | */ | |
2349 | static inline struct sk_buff *sk_validate_xmit_skb(struct sk_buff *skb, | |
2350 | struct net_device *dev) | |
2351 | { | |
2352 | #ifdef CONFIG_SOCK_VALIDATE_XMIT | |
2353 | struct sock *sk = skb->sk; | |
2354 | ||
2355 | if (sk && sk_fullsock(sk) && sk->sk_validate_xmit_skb) | |
2356 | skb = sk->sk_validate_xmit_skb(sk, dev, skb); | |
2357 | #endif | |
2358 | ||
2359 | return skb; | |
2360 | } | |
2361 | ||
e446f9df ED |
2362 | /* This helper checks if a socket is a LISTEN or NEW_SYN_RECV |
2363 | * SYNACK messages can be attached to either ones (depending on SYNCOOKIE) | |
2364 | */ | |
2365 | static inline bool sk_listener(const struct sock *sk) | |
2366 | { | |
2367 | return (1 << sk->sk_state) & (TCPF_LISTEN | TCPF_NEW_SYN_RECV); | |
2368 | } | |
2369 | ||
69336bd2 JP |
2370 | void sock_enable_timestamp(struct sock *sk, int flag); |
2371 | int sock_get_timestamp(struct sock *, struct timeval __user *); | |
2372 | int sock_get_timestampns(struct sock *, struct timespec __user *); | |
2373 | int sock_recv_errqueue(struct sock *sk, struct msghdr *msg, int len, int level, | |
2374 | int type); | |
1da177e4 | 2375 | |
a3b299da EB |
2376 | bool sk_ns_capable(const struct sock *sk, |
2377 | struct user_namespace *user_ns, int cap); | |
2378 | bool sk_capable(const struct sock *sk, int cap); | |
2379 | bool sk_net_capable(const struct sock *sk, int cap); | |
2380 | ||
a2d133b1 JH |
2381 | void sk_get_meminfo(const struct sock *sk, u32 *meminfo); |
2382 | ||
eaa72dc4 ED |
2383 | /* Take into consideration the size of the struct sk_buff overhead in the |
2384 | * determination of these values, since that is non-constant across | |
2385 | * platforms. This makes socket queueing behavior and performance | |
2386 | * not depend upon such differences. | |
2387 | */ | |
2388 | #define _SK_MEM_PACKETS 256 | |
2389 | #define _SK_MEM_OVERHEAD SKB_TRUESIZE(256) | |
2390 | #define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS) | |
2391 | #define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS) | |
2392 | ||
1da177e4 LT |
2393 | extern __u32 sysctl_wmem_max; |
2394 | extern __u32 sysctl_rmem_max; | |
2395 | ||
b245be1f | 2396 | extern int sysctl_tstamp_allow_data; |
6baf1f41 DM |
2397 | extern int sysctl_optmem_max; |
2398 | ||
20380731 ACM |
2399 | extern __u32 sysctl_wmem_default; |
2400 | extern __u32 sysctl_rmem_default; | |
20380731 | 2401 | |
a3dcaf17 ED |
2402 | static inline int sk_get_wmem0(const struct sock *sk, const struct proto *proto) |
2403 | { | |
2404 | /* Does this proto have per netns sysctl_wmem ? */ | |
2405 | if (proto->sysctl_wmem_offset) | |
2406 | return *(int *)((void *)sock_net(sk) + proto->sysctl_wmem_offset); | |
2407 | ||
2408 | return *proto->sysctl_wmem; | |
2409 | } | |
2410 | ||
2411 | static inline int sk_get_rmem0(const struct sock *sk, const struct proto *proto) | |
2412 | { | |
2413 | /* Does this proto have per netns sysctl_rmem ? */ | |
2414 | if (proto->sysctl_rmem_offset) | |
2415 | return *(int *)((void *)sock_net(sk) + proto->sysctl_rmem_offset); | |
2416 | ||
2417 | return *proto->sysctl_rmem; | |
2418 | } | |
2419 | ||
c9f1f58d ED |
2420 | /* Default TCP Small queue budget is ~1 ms of data (1sec >> 10) |
2421 | * Some wifi drivers need to tweak it to get more chunks. | |
2422 | * They can use this helper from their ndo_start_xmit() | |
2423 | */ | |
2424 | static inline void sk_pacing_shift_update(struct sock *sk, int val) | |
2425 | { | |
2426 | if (!sk || !sk_fullsock(sk) || sk->sk_pacing_shift == val) | |
2427 | return; | |
2428 | sk->sk_pacing_shift = val; | |
2429 | } | |
2430 | ||
54dc3e33 DA |
2431 | /* if a socket is bound to a device, check that the given device |
2432 | * index is either the same or that the socket is bound to an L3 | |
2433 | * master device and the given device index is also enslaved to | |
2434 | * that L3 master | |
2435 | */ | |
2436 | static inline bool sk_dev_equal_l3scope(struct sock *sk, int dif) | |
2437 | { | |
2438 | int mdif; | |
2439 | ||
2440 | if (!sk->sk_bound_dev_if || sk->sk_bound_dev_if == dif) | |
2441 | return true; | |
2442 | ||
2443 | mdif = l3mdev_master_ifindex_by_index(sock_net(sk), dif); | |
2444 | if (mdif && mdif == sk->sk_bound_dev_if) | |
2445 | return true; | |
2446 | ||
2447 | return false; | |
2448 | } | |
2449 | ||
1da177e4 | 2450 | #endif /* _SOCK_H */ |