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1da177e4 LT |
1 | /* |
2 | * INET An implementation of the TCP/IP protocol suite for the LINUX | |
3 | * operating system. INET is implemented using the BSD Socket | |
4 | * interface as the means of communication with the user level. | |
5 | * | |
6 | * Definitions for the AF_INET socket handler. | |
7 | * | |
8 | * Version: @(#)sock.h 1.0.4 05/13/93 | |
9 | * | |
02c30a84 | 10 | * Authors: Ross Biro |
1da177e4 LT |
11 | * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> |
12 | * Corey Minyard <wf-rch!minyard@relay.EU.net> | |
13 | * Florian La Roche <flla@stud.uni-sb.de> | |
14 | * | |
15 | * Fixes: | |
16 | * Alan Cox : Volatiles in skbuff pointers. See | |
17 | * skbuff comments. May be overdone, | |
18 | * better to prove they can be removed | |
19 | * than the reverse. | |
20 | * Alan Cox : Added a zapped field for tcp to note | |
21 | * a socket is reset and must stay shut up | |
22 | * Alan Cox : New fields for options | |
23 | * Pauline Middelink : identd support | |
24 | * Alan Cox : Eliminate low level recv/recvfrom | |
25 | * David S. Miller : New socket lookup architecture. | |
26 | * Steve Whitehouse: Default routines for sock_ops | |
27 | * Arnaldo C. Melo : removed net_pinfo, tp_pinfo and made | |
28 | * protinfo be just a void pointer, as the | |
29 | * protocol specific parts were moved to | |
30 | * respective headers and ipv4/v6, etc now | |
31 | * use private slabcaches for its socks | |
32 | * Pedro Hortas : New flags field for socket options | |
33 | * | |
34 | * | |
35 | * This program is free software; you can redistribute it and/or | |
36 | * modify it under the terms of the GNU General Public License | |
37 | * as published by the Free Software Foundation; either version | |
38 | * 2 of the License, or (at your option) any later version. | |
39 | */ | |
40 | #ifndef _SOCK_H | |
41 | #define _SOCK_H | |
42 | ||
a6b7a407 | 43 | #include <linux/hardirq.h> |
172589cc | 44 | #include <linux/kernel.h> |
1da177e4 | 45 | #include <linux/list.h> |
88ab1932 | 46 | #include <linux/list_nulls.h> |
1da177e4 LT |
47 | #include <linux/timer.h> |
48 | #include <linux/cache.h> | |
3f134619 | 49 | #include <linux/bitops.h> |
a5b5bb9a | 50 | #include <linux/lockdep.h> |
1da177e4 LT |
51 | #include <linux/netdevice.h> |
52 | #include <linux/skbuff.h> /* struct sk_buff */ | |
d7fe0f24 | 53 | #include <linux/mm.h> |
1da177e4 | 54 | #include <linux/security.h> |
5a0e3ad6 | 55 | #include <linux/slab.h> |
c6e1a0d1 | 56 | #include <linux/uaccess.h> |
180d8cd9 | 57 | #include <linux/memcontrol.h> |
e1aab161 | 58 | #include <linux/res_counter.h> |
c5905afb | 59 | #include <linux/static_key.h> |
40401530 AV |
60 | #include <linux/aio.h> |
61 | #include <linux/sched.h> | |
1da177e4 LT |
62 | |
63 | #include <linux/filter.h> | |
88ab1932 | 64 | #include <linux/rculist_nulls.h> |
a57de0b4 | 65 | #include <linux/poll.h> |
1da177e4 | 66 | |
c31504dc | 67 | #include <linux/atomic.h> |
1da177e4 LT |
68 | #include <net/dst.h> |
69 | #include <net/checksum.h> | |
70 | ||
9f048bfb ED |
71 | struct cgroup; |
72 | struct cgroup_subsys; | |
c607b2ed | 73 | #ifdef CONFIG_NET |
1d62e436 GC |
74 | int mem_cgroup_sockets_init(struct mem_cgroup *memcg, struct cgroup_subsys *ss); |
75 | void mem_cgroup_sockets_destroy(struct mem_cgroup *memcg); | |
c607b2ed GC |
76 | #else |
77 | static inline | |
1d62e436 | 78 | int mem_cgroup_sockets_init(struct mem_cgroup *memcg, struct cgroup_subsys *ss) |
c607b2ed GC |
79 | { |
80 | return 0; | |
81 | } | |
82 | static inline | |
1d62e436 | 83 | void mem_cgroup_sockets_destroy(struct mem_cgroup *memcg) |
c607b2ed GC |
84 | { |
85 | } | |
86 | #endif | |
1da177e4 LT |
87 | /* |
88 | * This structure really needs to be cleaned up. | |
89 | * Most of it is for TCP, and not used by any of | |
90 | * the other protocols. | |
91 | */ | |
92 | ||
93 | /* Define this to get the SOCK_DBG debugging facility. */ | |
94 | #define SOCK_DEBUGGING | |
95 | #ifdef SOCK_DEBUGGING | |
96 | #define SOCK_DEBUG(sk, msg...) do { if ((sk) && sock_flag((sk), SOCK_DBG)) \ | |
97 | printk(KERN_DEBUG msg); } while (0) | |
98 | #else | |
4cd9029d | 99 | /* Validate arguments and do nothing */ |
b9075fa9 | 100 | static inline __printf(2, 3) |
dc6b9b78 | 101 | void SOCK_DEBUG(const struct sock *sk, const char *msg, ...) |
4cd9029d SH |
102 | { |
103 | } | |
1da177e4 LT |
104 | #endif |
105 | ||
106 | /* This is the per-socket lock. The spinlock provides a synchronization | |
107 | * between user contexts and software interrupt processing, whereas the | |
108 | * mini-semaphore synchronizes multiple users amongst themselves. | |
109 | */ | |
1da177e4 LT |
110 | typedef struct { |
111 | spinlock_t slock; | |
d2e9117c | 112 | int owned; |
1da177e4 | 113 | wait_queue_head_t wq; |
a5b5bb9a IM |
114 | /* |
115 | * We express the mutex-alike socket_lock semantics | |
116 | * to the lock validator by explicitly managing | |
117 | * the slock as a lock variant (in addition to | |
118 | * the slock itself): | |
119 | */ | |
120 | #ifdef CONFIG_DEBUG_LOCK_ALLOC | |
121 | struct lockdep_map dep_map; | |
122 | #endif | |
1da177e4 LT |
123 | } socket_lock_t; |
124 | ||
1da177e4 | 125 | struct sock; |
8feaf0c0 | 126 | struct proto; |
0eeb8ffc | 127 | struct net; |
1da177e4 | 128 | |
077b393d ED |
129 | typedef __u32 __bitwise __portpair; |
130 | typedef __u64 __bitwise __addrpair; | |
131 | ||
1da177e4 | 132 | /** |
4dc3b16b | 133 | * struct sock_common - minimal network layer representation of sockets |
68835aba ED |
134 | * @skc_daddr: Foreign IPv4 addr |
135 | * @skc_rcv_saddr: Bound local IPv4 addr | |
4dc6dc71 | 136 | * @skc_hash: hash value used with various protocol lookup tables |
d4cada4a | 137 | * @skc_u16hashes: two u16 hash values used by UDP lookup tables |
ce43b03e ED |
138 | * @skc_dport: placeholder for inet_dport/tw_dport |
139 | * @skc_num: placeholder for inet_num/tw_num | |
4dc3b16b PP |
140 | * @skc_family: network address family |
141 | * @skc_state: Connection state | |
142 | * @skc_reuse: %SO_REUSEADDR setting | |
055dc21a | 143 | * @skc_reuseport: %SO_REUSEPORT setting |
4dc3b16b | 144 | * @skc_bound_dev_if: bound device index if != 0 |
4dc3b16b | 145 | * @skc_bind_node: bind hash linkage for various protocol lookup tables |
512615b6 | 146 | * @skc_portaddr_node: second hash linkage for UDP/UDP-Lite protocol |
8feaf0c0 | 147 | * @skc_prot: protocol handlers inside a network family |
07feaebf | 148 | * @skc_net: reference to the network namespace of this socket |
68835aba ED |
149 | * @skc_node: main hash linkage for various protocol lookup tables |
150 | * @skc_nulls_node: main hash linkage for TCP/UDP/UDP-Lite protocol | |
151 | * @skc_tx_queue_mapping: tx queue number for this connection | |
152 | * @skc_refcnt: reference count | |
4dc3b16b PP |
153 | * |
154 | * This is the minimal network layer representation of sockets, the header | |
8feaf0c0 ACM |
155 | * for struct sock and struct inet_timewait_sock. |
156 | */ | |
1da177e4 | 157 | struct sock_common { |
ce43b03e | 158 | /* skc_daddr and skc_rcv_saddr must be grouped on a 8 bytes aligned |
05dbc7b5 | 159 | * address on 64bit arches : cf INET_MATCH() |
4dc6dc71 | 160 | */ |
ce43b03e | 161 | union { |
077b393d | 162 | __addrpair skc_addrpair; |
ce43b03e ED |
163 | struct { |
164 | __be32 skc_daddr; | |
165 | __be32 skc_rcv_saddr; | |
166 | }; | |
167 | }; | |
d4cada4a ED |
168 | union { |
169 | unsigned int skc_hash; | |
170 | __u16 skc_u16hashes[2]; | |
171 | }; | |
ce43b03e ED |
172 | /* skc_dport && skc_num must be grouped as well */ |
173 | union { | |
077b393d | 174 | __portpair skc_portpair; |
ce43b03e ED |
175 | struct { |
176 | __be16 skc_dport; | |
177 | __u16 skc_num; | |
178 | }; | |
179 | }; | |
180 | ||
4dc6dc71 ED |
181 | unsigned short skc_family; |
182 | volatile unsigned char skc_state; | |
055dc21a TH |
183 | unsigned char skc_reuse:4; |
184 | unsigned char skc_reuseport:4; | |
4dc6dc71 | 185 | int skc_bound_dev_if; |
512615b6 ED |
186 | union { |
187 | struct hlist_node skc_bind_node; | |
188 | struct hlist_nulls_node skc_portaddr_node; | |
189 | }; | |
8feaf0c0 | 190 | struct proto *skc_prot; |
3b1e0a65 | 191 | #ifdef CONFIG_NET_NS |
07feaebf | 192 | struct net *skc_net; |
3b1e0a65 | 193 | #endif |
68835aba ED |
194 | /* |
195 | * fields between dontcopy_begin/dontcopy_end | |
196 | * are not copied in sock_copy() | |
197 | */ | |
928c41e7 | 198 | /* private: */ |
68835aba | 199 | int skc_dontcopy_begin[0]; |
928c41e7 | 200 | /* public: */ |
68835aba ED |
201 | union { |
202 | struct hlist_node skc_node; | |
203 | struct hlist_nulls_node skc_nulls_node; | |
204 | }; | |
205 | int skc_tx_queue_mapping; | |
206 | atomic_t skc_refcnt; | |
928c41e7 | 207 | /* private: */ |
68835aba | 208 | int skc_dontcopy_end[0]; |
928c41e7 | 209 | /* public: */ |
1da177e4 LT |
210 | }; |
211 | ||
e1aab161 | 212 | struct cg_proto; |
1da177e4 LT |
213 | /** |
214 | * struct sock - network layer representation of sockets | |
8feaf0c0 | 215 | * @__sk_common: shared layout with inet_timewait_sock |
4dc3b16b PP |
216 | * @sk_shutdown: mask of %SEND_SHUTDOWN and/or %RCV_SHUTDOWN |
217 | * @sk_userlocks: %SO_SNDBUF and %SO_RCVBUF settings | |
218 | * @sk_lock: synchronizer | |
219 | * @sk_rcvbuf: size of receive buffer in bytes | |
43815482 | 220 | * @sk_wq: sock wait queue and async head |
421b3885 | 221 | * @sk_rx_dst: receive input route used by early demux |
4dc3b16b PP |
222 | * @sk_dst_cache: destination cache |
223 | * @sk_dst_lock: destination cache lock | |
224 | * @sk_policy: flow policy | |
4dc3b16b PP |
225 | * @sk_receive_queue: incoming packets |
226 | * @sk_wmem_alloc: transmit queue bytes committed | |
227 | * @sk_write_queue: Packet sending queue | |
97fc2f08 | 228 | * @sk_async_wait_queue: DMA copied packets |
4dc3b16b PP |
229 | * @sk_omem_alloc: "o" is "option" or "other" |
230 | * @sk_wmem_queued: persistent queue size | |
231 | * @sk_forward_alloc: space allocated forward | |
06021292 | 232 | * @sk_napi_id: id of the last napi context to receive data for sk |
dafcc438 | 233 | * @sk_ll_usec: usecs to busypoll when there is no data |
4dc3b16b | 234 | * @sk_allocation: allocation mode |
95bd09eb | 235 | * @sk_pacing_rate: Pacing rate (if supported by transport/packet scheduler) |
c3f40d7c | 236 | * @sk_max_pacing_rate: Maximum pacing rate (%SO_MAX_PACING_RATE) |
4dc3b16b | 237 | * @sk_sndbuf: size of send buffer in bytes |
33c732c3 | 238 | * @sk_flags: %SO_LINGER (l_onoff), %SO_BROADCAST, %SO_KEEPALIVE, |
20d49473 | 239 | * %SO_OOBINLINE settings, %SO_TIMESTAMPING settings |
48fc7f7e | 240 | * @sk_no_check: %SO_NO_CHECK setting, whether or not checkup packets |
4dc3b16b | 241 | * @sk_route_caps: route capabilities (e.g. %NETIF_F_TSO) |
a465419b | 242 | * @sk_route_nocaps: forbidden route capabilities (e.g NETIF_F_GSO_MASK) |
bcd76111 | 243 | * @sk_gso_type: GSO type (e.g. %SKB_GSO_TCPV4) |
82cc1a7a | 244 | * @sk_gso_max_size: Maximum GSO segment size to build |
1485348d | 245 | * @sk_gso_max_segs: Maximum number of GSO segments |
4dc3b16b | 246 | * @sk_lingertime: %SO_LINGER l_linger setting |
4dc3b16b PP |
247 | * @sk_backlog: always used with the per-socket spinlock held |
248 | * @sk_callback_lock: used with the callbacks in the end of this struct | |
249 | * @sk_error_queue: rarely used | |
33c732c3 WC |
250 | * @sk_prot_creator: sk_prot of original sock creator (see ipv6_setsockopt, |
251 | * IPV6_ADDRFORM for instance) | |
4dc3b16b | 252 | * @sk_err: last error |
33c732c3 WC |
253 | * @sk_err_soft: errors that don't cause failure but are the cause of a |
254 | * persistent failure not just 'timed out' | |
cb61cb9b | 255 | * @sk_drops: raw/udp drops counter |
4dc3b16b PP |
256 | * @sk_ack_backlog: current listen backlog |
257 | * @sk_max_ack_backlog: listen backlog set in listen() | |
258 | * @sk_priority: %SO_PRIORITY setting | |
1a3bc369 | 259 | * @sk_cgrp_prioidx: socket group's priority map index |
4dc3b16b PP |
260 | * @sk_type: socket type (%SOCK_STREAM, etc) |
261 | * @sk_protocol: which protocol this socket belongs in this network family | |
53c3fa20 RD |
262 | * @sk_peer_pid: &struct pid for this socket's peer |
263 | * @sk_peer_cred: %SO_PEERCRED setting | |
4dc3b16b PP |
264 | * @sk_rcvlowat: %SO_RCVLOWAT setting |
265 | * @sk_rcvtimeo: %SO_RCVTIMEO setting | |
266 | * @sk_sndtimeo: %SO_SNDTIMEO setting | |
c58dc01b | 267 | * @sk_rxhash: flow hash received from netif layer |
4dc3b16b PP |
268 | * @sk_filter: socket filtering instructions |
269 | * @sk_protinfo: private area, net family specific, when not using slab | |
270 | * @sk_timer: sock cleanup timer | |
271 | * @sk_stamp: time stamp of last packet received | |
272 | * @sk_socket: Identd and reporting IO signals | |
273 | * @sk_user_data: RPC layer private data | |
5640f768 | 274 | * @sk_frag: cached page frag |
d3d4f0a0 | 275 | * @sk_peek_off: current peek_offset value |
4dc3b16b | 276 | * @sk_send_head: front of stuff to transmit |
67be2dd1 | 277 | * @sk_security: used by security modules |
31729363 | 278 | * @sk_mark: generic packet mark |
53c3fa20 | 279 | * @sk_classid: this socket's cgroup classid |
e1aab161 | 280 | * @sk_cgrp: this socket's cgroup-specific proto data |
4dc3b16b PP |
281 | * @sk_write_pending: a write to stream socket waits to start |
282 | * @sk_state_change: callback to indicate change in the state of the sock | |
283 | * @sk_data_ready: callback to indicate there is data to be processed | |
284 | * @sk_write_space: callback to indicate there is bf sending space available | |
285 | * @sk_error_report: callback to indicate errors (e.g. %MSG_ERRQUEUE) | |
286 | * @sk_backlog_rcv: callback to process the backlog | |
287 | * @sk_destruct: called at sock freeing time, i.e. when all refcnt == 0 | |
1da177e4 LT |
288 | */ |
289 | struct sock { | |
290 | /* | |
8feaf0c0 | 291 | * Now struct inet_timewait_sock also uses sock_common, so please just |
1da177e4 LT |
292 | * don't add nothing before this first member (__sk_common) --acme |
293 | */ | |
294 | struct sock_common __sk_common; | |
4dc6dc71 ED |
295 | #define sk_node __sk_common.skc_node |
296 | #define sk_nulls_node __sk_common.skc_nulls_node | |
297 | #define sk_refcnt __sk_common.skc_refcnt | |
e022f0b4 | 298 | #define sk_tx_queue_mapping __sk_common.skc_tx_queue_mapping |
4dc6dc71 | 299 | |
68835aba ED |
300 | #define sk_dontcopy_begin __sk_common.skc_dontcopy_begin |
301 | #define sk_dontcopy_end __sk_common.skc_dontcopy_end | |
4dc6dc71 | 302 | #define sk_hash __sk_common.skc_hash |
50805466 | 303 | #define sk_portpair __sk_common.skc_portpair |
05dbc7b5 ED |
304 | #define sk_num __sk_common.skc_num |
305 | #define sk_dport __sk_common.skc_dport | |
50805466 ED |
306 | #define sk_addrpair __sk_common.skc_addrpair |
307 | #define sk_daddr __sk_common.skc_daddr | |
308 | #define sk_rcv_saddr __sk_common.skc_rcv_saddr | |
1da177e4 LT |
309 | #define sk_family __sk_common.skc_family |
310 | #define sk_state __sk_common.skc_state | |
311 | #define sk_reuse __sk_common.skc_reuse | |
055dc21a | 312 | #define sk_reuseport __sk_common.skc_reuseport |
1da177e4 | 313 | #define sk_bound_dev_if __sk_common.skc_bound_dev_if |
1da177e4 | 314 | #define sk_bind_node __sk_common.skc_bind_node |
8feaf0c0 | 315 | #define sk_prot __sk_common.skc_prot |
07feaebf | 316 | #define sk_net __sk_common.skc_net |
1da177e4 | 317 | socket_lock_t sk_lock; |
b178bb3d | 318 | struct sk_buff_head sk_receive_queue; |
fa438ccf ED |
319 | /* |
320 | * The backlog queue is special, it is always used with | |
321 | * the per-socket spinlock held and requires low latency | |
322 | * access. Therefore we special case it's implementation. | |
b178bb3d ED |
323 | * Note : rmem_alloc is in this structure to fill a hole |
324 | * on 64bit arches, not because its logically part of | |
325 | * backlog. | |
fa438ccf ED |
326 | */ |
327 | struct { | |
b178bb3d ED |
328 | atomic_t rmem_alloc; |
329 | int len; | |
330 | struct sk_buff *head; | |
331 | struct sk_buff *tail; | |
fa438ccf | 332 | } sk_backlog; |
b178bb3d ED |
333 | #define sk_rmem_alloc sk_backlog.rmem_alloc |
334 | int sk_forward_alloc; | |
335 | #ifdef CONFIG_RPS | |
336 | __u32 sk_rxhash; | |
06021292 | 337 | #endif |
e0d1095a | 338 | #ifdef CONFIG_NET_RX_BUSY_POLL |
06021292 | 339 | unsigned int sk_napi_id; |
dafcc438 | 340 | unsigned int sk_ll_usec; |
b178bb3d ED |
341 | #endif |
342 | atomic_t sk_drops; | |
343 | int sk_rcvbuf; | |
344 | ||
345 | struct sk_filter __rcu *sk_filter; | |
eaefd110 | 346 | struct socket_wq __rcu *sk_wq; |
b178bb3d ED |
347 | |
348 | #ifdef CONFIG_NET_DMA | |
349 | struct sk_buff_head sk_async_wait_queue; | |
350 | #endif | |
351 | ||
def8b4fa | 352 | #ifdef CONFIG_XFRM |
1da177e4 | 353 | struct xfrm_policy *sk_policy[2]; |
def8b4fa | 354 | #endif |
b178bb3d | 355 | unsigned long sk_flags; |
deaa5854 | 356 | struct dst_entry *sk_rx_dst; |
0e36cbb3 | 357 | struct dst_entry __rcu *sk_dst_cache; |
b6c6712a | 358 | spinlock_t sk_dst_lock; |
1da177e4 LT |
359 | atomic_t sk_wmem_alloc; |
360 | atomic_t sk_omem_alloc; | |
4e07a91c | 361 | int sk_sndbuf; |
1da177e4 | 362 | struct sk_buff_head sk_write_queue; |
b178bb3d ED |
363 | kmemcheck_bitfield_begin(flags); |
364 | unsigned int sk_shutdown : 2, | |
365 | sk_no_check : 2, | |
366 | sk_userlocks : 4, | |
367 | sk_protocol : 8, | |
368 | sk_type : 16; | |
369 | kmemcheck_bitfield_end(flags); | |
1da177e4 | 370 | int sk_wmem_queued; |
7d877f3b | 371 | gfp_t sk_allocation; |
95bd09eb | 372 | u32 sk_pacing_rate; /* bytes per second */ |
62748f32 | 373 | u32 sk_max_pacing_rate; |
c8f44aff MM |
374 | netdev_features_t sk_route_caps; |
375 | netdev_features_t sk_route_nocaps; | |
bcd76111 | 376 | int sk_gso_type; |
82cc1a7a | 377 | unsigned int sk_gso_max_size; |
1485348d | 378 | u16 sk_gso_max_segs; |
9932cf95 | 379 | int sk_rcvlowat; |
1da177e4 | 380 | unsigned long sk_lingertime; |
1da177e4 | 381 | struct sk_buff_head sk_error_queue; |
476e19cf | 382 | struct proto *sk_prot_creator; |
1da177e4 LT |
383 | rwlock_t sk_callback_lock; |
384 | int sk_err, | |
385 | sk_err_soft; | |
386 | unsigned short sk_ack_backlog; | |
387 | unsigned short sk_max_ack_backlog; | |
388 | __u32 sk_priority; | |
3d0dcfbd | 389 | #if IS_ENABLED(CONFIG_NETPRIO_CGROUP) |
5bc1421e NH |
390 | __u32 sk_cgrp_prioidx; |
391 | #endif | |
109f6e39 EB |
392 | struct pid *sk_peer_pid; |
393 | const struct cred *sk_peer_cred; | |
1da177e4 LT |
394 | long sk_rcvtimeo; |
395 | long sk_sndtimeo; | |
1da177e4 LT |
396 | void *sk_protinfo; |
397 | struct timer_list sk_timer; | |
b7aa0bf7 | 398 | ktime_t sk_stamp; |
1da177e4 LT |
399 | struct socket *sk_socket; |
400 | void *sk_user_data; | |
5640f768 | 401 | struct page_frag sk_frag; |
1da177e4 | 402 | struct sk_buff *sk_send_head; |
ef64a54f | 403 | __s32 sk_peek_off; |
1da177e4 | 404 | int sk_write_pending; |
d5f64238 | 405 | #ifdef CONFIG_SECURITY |
1da177e4 | 406 | void *sk_security; |
d5f64238 | 407 | #endif |
4a19ec58 | 408 | __u32 sk_mark; |
f8451725 | 409 | u32 sk_classid; |
e1aab161 | 410 | struct cg_proto *sk_cgrp; |
1da177e4 LT |
411 | void (*sk_state_change)(struct sock *sk); |
412 | void (*sk_data_ready)(struct sock *sk, int bytes); | |
413 | void (*sk_write_space)(struct sock *sk); | |
414 | void (*sk_error_report)(struct sock *sk); | |
dc6b9b78 ED |
415 | int (*sk_backlog_rcv)(struct sock *sk, |
416 | struct sk_buff *skb); | |
1da177e4 LT |
417 | void (*sk_destruct)(struct sock *sk); |
418 | }; | |
419 | ||
559835ea PS |
420 | #define __sk_user_data(sk) ((*((void __rcu **)&(sk)->sk_user_data))) |
421 | ||
422 | #define rcu_dereference_sk_user_data(sk) rcu_dereference(__sk_user_data((sk))) | |
423 | #define rcu_assign_sk_user_data(sk, ptr) rcu_assign_pointer(__sk_user_data((sk)), ptr) | |
424 | ||
4a17fd52 PE |
425 | /* |
426 | * SK_CAN_REUSE and SK_NO_REUSE on a socket mean that the socket is OK | |
427 | * or not whether his port will be reused by someone else. SK_FORCE_REUSE | |
428 | * on a socket means that the socket will reuse everybody else's port | |
429 | * without looking at the other's sk_reuse value. | |
430 | */ | |
431 | ||
432 | #define SK_NO_REUSE 0 | |
433 | #define SK_CAN_REUSE 1 | |
434 | #define SK_FORCE_REUSE 2 | |
435 | ||
ef64a54f PE |
436 | static inline int sk_peek_offset(struct sock *sk, int flags) |
437 | { | |
438 | if ((flags & MSG_PEEK) && (sk->sk_peek_off >= 0)) | |
439 | return sk->sk_peek_off; | |
440 | else | |
441 | return 0; | |
442 | } | |
443 | ||
444 | static inline void sk_peek_offset_bwd(struct sock *sk, int val) | |
445 | { | |
446 | if (sk->sk_peek_off >= 0) { | |
447 | if (sk->sk_peek_off >= val) | |
448 | sk->sk_peek_off -= val; | |
449 | else | |
450 | sk->sk_peek_off = 0; | |
451 | } | |
452 | } | |
453 | ||
454 | static inline void sk_peek_offset_fwd(struct sock *sk, int val) | |
455 | { | |
456 | if (sk->sk_peek_off >= 0) | |
457 | sk->sk_peek_off += val; | |
458 | } | |
459 | ||
1da177e4 LT |
460 | /* |
461 | * Hashed lists helper routines | |
462 | */ | |
c4146644 LZ |
463 | static inline struct sock *sk_entry(const struct hlist_node *node) |
464 | { | |
465 | return hlist_entry(node, struct sock, sk_node); | |
466 | } | |
467 | ||
e48c414e | 468 | static inline struct sock *__sk_head(const struct hlist_head *head) |
1da177e4 LT |
469 | { |
470 | return hlist_entry(head->first, struct sock, sk_node); | |
471 | } | |
472 | ||
e48c414e | 473 | static inline struct sock *sk_head(const struct hlist_head *head) |
1da177e4 LT |
474 | { |
475 | return hlist_empty(head) ? NULL : __sk_head(head); | |
476 | } | |
477 | ||
88ab1932 ED |
478 | static inline struct sock *__sk_nulls_head(const struct hlist_nulls_head *head) |
479 | { | |
480 | return hlist_nulls_entry(head->first, struct sock, sk_nulls_node); | |
481 | } | |
482 | ||
483 | static inline struct sock *sk_nulls_head(const struct hlist_nulls_head *head) | |
484 | { | |
485 | return hlist_nulls_empty(head) ? NULL : __sk_nulls_head(head); | |
486 | } | |
487 | ||
e48c414e | 488 | static inline struct sock *sk_next(const struct sock *sk) |
1da177e4 LT |
489 | { |
490 | return sk->sk_node.next ? | |
491 | hlist_entry(sk->sk_node.next, struct sock, sk_node) : NULL; | |
492 | } | |
493 | ||
88ab1932 ED |
494 | static inline struct sock *sk_nulls_next(const struct sock *sk) |
495 | { | |
496 | return (!is_a_nulls(sk->sk_nulls_node.next)) ? | |
497 | hlist_nulls_entry(sk->sk_nulls_node.next, | |
498 | struct sock, sk_nulls_node) : | |
499 | NULL; | |
500 | } | |
501 | ||
dc6b9b78 | 502 | static inline bool sk_unhashed(const struct sock *sk) |
1da177e4 LT |
503 | { |
504 | return hlist_unhashed(&sk->sk_node); | |
505 | } | |
506 | ||
dc6b9b78 | 507 | static inline bool sk_hashed(const struct sock *sk) |
1da177e4 | 508 | { |
da753bea | 509 | return !sk_unhashed(sk); |
1da177e4 LT |
510 | } |
511 | ||
dc6b9b78 | 512 | static inline void sk_node_init(struct hlist_node *node) |
1da177e4 LT |
513 | { |
514 | node->pprev = NULL; | |
515 | } | |
516 | ||
dc6b9b78 | 517 | static inline void sk_nulls_node_init(struct hlist_nulls_node *node) |
88ab1932 ED |
518 | { |
519 | node->pprev = NULL; | |
520 | } | |
521 | ||
dc6b9b78 | 522 | static inline void __sk_del_node(struct sock *sk) |
1da177e4 LT |
523 | { |
524 | __hlist_del(&sk->sk_node); | |
525 | } | |
526 | ||
808f5114 | 527 | /* NB: equivalent to hlist_del_init_rcu */ |
dc6b9b78 | 528 | static inline bool __sk_del_node_init(struct sock *sk) |
1da177e4 LT |
529 | { |
530 | if (sk_hashed(sk)) { | |
531 | __sk_del_node(sk); | |
532 | sk_node_init(&sk->sk_node); | |
dc6b9b78 | 533 | return true; |
1da177e4 | 534 | } |
dc6b9b78 | 535 | return false; |
1da177e4 LT |
536 | } |
537 | ||
538 | /* Grab socket reference count. This operation is valid only | |
539 | when sk is ALREADY grabbed f.e. it is found in hash table | |
540 | or a list and the lookup is made under lock preventing hash table | |
541 | modifications. | |
542 | */ | |
543 | ||
544 | static inline void sock_hold(struct sock *sk) | |
545 | { | |
546 | atomic_inc(&sk->sk_refcnt); | |
547 | } | |
548 | ||
549 | /* Ungrab socket in the context, which assumes that socket refcnt | |
550 | cannot hit zero, f.e. it is true in context of any socketcall. | |
551 | */ | |
552 | static inline void __sock_put(struct sock *sk) | |
553 | { | |
554 | atomic_dec(&sk->sk_refcnt); | |
555 | } | |
556 | ||
dc6b9b78 | 557 | static inline bool sk_del_node_init(struct sock *sk) |
1da177e4 | 558 | { |
dc6b9b78 | 559 | bool rc = __sk_del_node_init(sk); |
1da177e4 LT |
560 | |
561 | if (rc) { | |
562 | /* paranoid for a while -acme */ | |
563 | WARN_ON(atomic_read(&sk->sk_refcnt) == 1); | |
564 | __sock_put(sk); | |
565 | } | |
566 | return rc; | |
567 | } | |
808f5114 | 568 | #define sk_del_node_init_rcu(sk) sk_del_node_init(sk) |
1da177e4 | 569 | |
dc6b9b78 | 570 | static inline bool __sk_nulls_del_node_init_rcu(struct sock *sk) |
271b72c7 ED |
571 | { |
572 | if (sk_hashed(sk)) { | |
88ab1932 | 573 | hlist_nulls_del_init_rcu(&sk->sk_nulls_node); |
dc6b9b78 | 574 | return true; |
271b72c7 | 575 | } |
dc6b9b78 | 576 | return false; |
271b72c7 ED |
577 | } |
578 | ||
dc6b9b78 | 579 | static inline bool sk_nulls_del_node_init_rcu(struct sock *sk) |
271b72c7 | 580 | { |
dc6b9b78 | 581 | bool rc = __sk_nulls_del_node_init_rcu(sk); |
271b72c7 ED |
582 | |
583 | if (rc) { | |
584 | /* paranoid for a while -acme */ | |
585 | WARN_ON(atomic_read(&sk->sk_refcnt) == 1); | |
586 | __sock_put(sk); | |
587 | } | |
588 | return rc; | |
589 | } | |
590 | ||
dc6b9b78 | 591 | static inline void __sk_add_node(struct sock *sk, struct hlist_head *list) |
1da177e4 LT |
592 | { |
593 | hlist_add_head(&sk->sk_node, list); | |
594 | } | |
595 | ||
dc6b9b78 | 596 | static inline void sk_add_node(struct sock *sk, struct hlist_head *list) |
1da177e4 LT |
597 | { |
598 | sock_hold(sk); | |
599 | __sk_add_node(sk, list); | |
600 | } | |
601 | ||
dc6b9b78 | 602 | static inline void sk_add_node_rcu(struct sock *sk, struct hlist_head *list) |
808f5114 | 603 | { |
604 | sock_hold(sk); | |
605 | hlist_add_head_rcu(&sk->sk_node, list); | |
606 | } | |
607 | ||
dc6b9b78 | 608 | static inline void __sk_nulls_add_node_rcu(struct sock *sk, struct hlist_nulls_head *list) |
271b72c7 | 609 | { |
88ab1932 | 610 | hlist_nulls_add_head_rcu(&sk->sk_nulls_node, list); |
271b72c7 ED |
611 | } |
612 | ||
dc6b9b78 | 613 | static inline void sk_nulls_add_node_rcu(struct sock *sk, struct hlist_nulls_head *list) |
271b72c7 ED |
614 | { |
615 | sock_hold(sk); | |
88ab1932 | 616 | __sk_nulls_add_node_rcu(sk, list); |
271b72c7 ED |
617 | } |
618 | ||
dc6b9b78 | 619 | static inline void __sk_del_bind_node(struct sock *sk) |
1da177e4 LT |
620 | { |
621 | __hlist_del(&sk->sk_bind_node); | |
622 | } | |
623 | ||
dc6b9b78 | 624 | static inline void sk_add_bind_node(struct sock *sk, |
1da177e4 LT |
625 | struct hlist_head *list) |
626 | { | |
627 | hlist_add_head(&sk->sk_bind_node, list); | |
628 | } | |
629 | ||
b67bfe0d SL |
630 | #define sk_for_each(__sk, list) \ |
631 | hlist_for_each_entry(__sk, list, sk_node) | |
632 | #define sk_for_each_rcu(__sk, list) \ | |
633 | hlist_for_each_entry_rcu(__sk, list, sk_node) | |
88ab1932 ED |
634 | #define sk_nulls_for_each(__sk, node, list) \ |
635 | hlist_nulls_for_each_entry(__sk, node, list, sk_nulls_node) | |
636 | #define sk_nulls_for_each_rcu(__sk, node, list) \ | |
637 | hlist_nulls_for_each_entry_rcu(__sk, node, list, sk_nulls_node) | |
b67bfe0d SL |
638 | #define sk_for_each_from(__sk) \ |
639 | hlist_for_each_entry_from(__sk, sk_node) | |
88ab1932 ED |
640 | #define sk_nulls_for_each_from(__sk, node) \ |
641 | if (__sk && ({ node = &(__sk)->sk_nulls_node; 1; })) \ | |
642 | hlist_nulls_for_each_entry_from(__sk, node, sk_nulls_node) | |
b67bfe0d SL |
643 | #define sk_for_each_safe(__sk, tmp, list) \ |
644 | hlist_for_each_entry_safe(__sk, tmp, list, sk_node) | |
645 | #define sk_for_each_bound(__sk, list) \ | |
646 | hlist_for_each_entry(__sk, list, sk_bind_node) | |
1da177e4 | 647 | |
c336d148 EB |
648 | static inline struct user_namespace *sk_user_ns(struct sock *sk) |
649 | { | |
650 | /* Careful only use this in a context where these parameters | |
651 | * can not change and must all be valid, such as recvmsg from | |
652 | * userspace. | |
653 | */ | |
654 | return sk->sk_socket->file->f_cred->user_ns; | |
655 | } | |
656 | ||
1da177e4 LT |
657 | /* Sock flags */ |
658 | enum sock_flags { | |
659 | SOCK_DEAD, | |
660 | SOCK_DONE, | |
661 | SOCK_URGINLINE, | |
662 | SOCK_KEEPOPEN, | |
663 | SOCK_LINGER, | |
664 | SOCK_DESTROY, | |
665 | SOCK_BROADCAST, | |
666 | SOCK_TIMESTAMP, | |
667 | SOCK_ZAPPED, | |
668 | SOCK_USE_WRITE_QUEUE, /* whether to call sk->sk_write_space in sock_wfree */ | |
669 | SOCK_DBG, /* %SO_DEBUG setting */ | |
670 | SOCK_RCVTSTAMP, /* %SO_TIMESTAMP setting */ | |
92f37fd2 | 671 | SOCK_RCVTSTAMPNS, /* %SO_TIMESTAMPNS setting */ |
1da177e4 LT |
672 | SOCK_LOCALROUTE, /* route locally only, %SO_DONTROUTE setting */ |
673 | SOCK_QUEUE_SHRUNK, /* write queue has been shrunk recently */ | |
7cb02404 | 674 | SOCK_MEMALLOC, /* VM depends on this socket for swapping */ |
20d49473 PO |
675 | SOCK_TIMESTAMPING_TX_HARDWARE, /* %SOF_TIMESTAMPING_TX_HARDWARE */ |
676 | SOCK_TIMESTAMPING_TX_SOFTWARE, /* %SOF_TIMESTAMPING_TX_SOFTWARE */ | |
677 | SOCK_TIMESTAMPING_RX_HARDWARE, /* %SOF_TIMESTAMPING_RX_HARDWARE */ | |
678 | SOCK_TIMESTAMPING_RX_SOFTWARE, /* %SOF_TIMESTAMPING_RX_SOFTWARE */ | |
679 | SOCK_TIMESTAMPING_SOFTWARE, /* %SOF_TIMESTAMPING_SOFTWARE */ | |
680 | SOCK_TIMESTAMPING_RAW_HARDWARE, /* %SOF_TIMESTAMPING_RAW_HARDWARE */ | |
681 | SOCK_TIMESTAMPING_SYS_HARDWARE, /* %SOF_TIMESTAMPING_SYS_HARDWARE */ | |
bcdce719 | 682 | SOCK_FASYNC, /* fasync() active */ |
3b885787 | 683 | SOCK_RXQ_OVFL, |
1cdebb42 | 684 | SOCK_ZEROCOPY, /* buffers from userspace */ |
6e3e939f | 685 | SOCK_WIFI_STATUS, /* push wifi status to userspace */ |
3bdc0eba BG |
686 | SOCK_NOFCS, /* Tell NIC not to do the Ethernet FCS. |
687 | * Will use last 4 bytes of packet sent from | |
688 | * user-space instead. | |
689 | */ | |
d59577b6 | 690 | SOCK_FILTER_LOCKED, /* Filter cannot be changed anymore */ |
7d4c04fc | 691 | SOCK_SELECT_ERR_QUEUE, /* Wake select on error queue */ |
1da177e4 LT |
692 | }; |
693 | ||
53b924b3 RB |
694 | static inline void sock_copy_flags(struct sock *nsk, struct sock *osk) |
695 | { | |
696 | nsk->sk_flags = osk->sk_flags; | |
697 | } | |
698 | ||
1da177e4 LT |
699 | static inline void sock_set_flag(struct sock *sk, enum sock_flags flag) |
700 | { | |
701 | __set_bit(flag, &sk->sk_flags); | |
702 | } | |
703 | ||
704 | static inline void sock_reset_flag(struct sock *sk, enum sock_flags flag) | |
705 | { | |
706 | __clear_bit(flag, &sk->sk_flags); | |
707 | } | |
708 | ||
1b23a5df | 709 | static inline bool sock_flag(const struct sock *sk, enum sock_flags flag) |
1da177e4 LT |
710 | { |
711 | return test_bit(flag, &sk->sk_flags); | |
712 | } | |
713 | ||
c93bdd0e MG |
714 | #ifdef CONFIG_NET |
715 | extern struct static_key memalloc_socks; | |
716 | static inline int sk_memalloc_socks(void) | |
717 | { | |
718 | return static_key_false(&memalloc_socks); | |
719 | } | |
720 | #else | |
721 | ||
722 | static inline int sk_memalloc_socks(void) | |
723 | { | |
724 | return 0; | |
725 | } | |
726 | ||
727 | #endif | |
728 | ||
99a1dec7 MG |
729 | static inline gfp_t sk_gfp_atomic(struct sock *sk, gfp_t gfp_mask) |
730 | { | |
7cb02404 | 731 | return GFP_ATOMIC | (sk->sk_allocation & __GFP_MEMALLOC); |
99a1dec7 MG |
732 | } |
733 | ||
1da177e4 LT |
734 | static inline void sk_acceptq_removed(struct sock *sk) |
735 | { | |
736 | sk->sk_ack_backlog--; | |
737 | } | |
738 | ||
739 | static inline void sk_acceptq_added(struct sock *sk) | |
740 | { | |
741 | sk->sk_ack_backlog++; | |
742 | } | |
743 | ||
dc6b9b78 | 744 | static inline bool sk_acceptq_is_full(const struct sock *sk) |
1da177e4 | 745 | { |
64a14651 | 746 | return sk->sk_ack_backlog > sk->sk_max_ack_backlog; |
1da177e4 LT |
747 | } |
748 | ||
749 | /* | |
750 | * Compute minimal free write space needed to queue new packets. | |
751 | */ | |
dc6b9b78 | 752 | static inline int sk_stream_min_wspace(const struct sock *sk) |
1da177e4 | 753 | { |
8df09ea3 | 754 | return sk->sk_wmem_queued >> 1; |
1da177e4 LT |
755 | } |
756 | ||
dc6b9b78 | 757 | static inline int sk_stream_wspace(const struct sock *sk) |
1da177e4 LT |
758 | { |
759 | return sk->sk_sndbuf - sk->sk_wmem_queued; | |
760 | } | |
761 | ||
69336bd2 | 762 | void sk_stream_write_space(struct sock *sk); |
1da177e4 | 763 | |
8eae939f | 764 | /* OOB backlog add */ |
a3a858ff | 765 | static inline void __sk_add_backlog(struct sock *sk, struct sk_buff *skb) |
9ee6b535 | 766 | { |
7fee226a ED |
767 | /* dont let skb dst not refcounted, we are going to leave rcu lock */ |
768 | skb_dst_force(skb); | |
769 | ||
770 | if (!sk->sk_backlog.tail) | |
771 | sk->sk_backlog.head = skb; | |
772 | else | |
9ee6b535 | 773 | sk->sk_backlog.tail->next = skb; |
7fee226a ED |
774 | |
775 | sk->sk_backlog.tail = skb; | |
9ee6b535 SH |
776 | skb->next = NULL; |
777 | } | |
1da177e4 | 778 | |
c377411f ED |
779 | /* |
780 | * Take into account size of receive queue and backlog queue | |
0fd7bac6 ED |
781 | * Do not take into account this skb truesize, |
782 | * to allow even a single big packet to come. | |
c377411f | 783 | */ |
f545a38f ED |
784 | static inline bool sk_rcvqueues_full(const struct sock *sk, const struct sk_buff *skb, |
785 | unsigned int limit) | |
c377411f ED |
786 | { |
787 | unsigned int qsize = sk->sk_backlog.len + atomic_read(&sk->sk_rmem_alloc); | |
788 | ||
f545a38f | 789 | return qsize > limit; |
c377411f ED |
790 | } |
791 | ||
8eae939f | 792 | /* The per-socket spinlock must be held here. */ |
f545a38f ED |
793 | static inline __must_check int sk_add_backlog(struct sock *sk, struct sk_buff *skb, |
794 | unsigned int limit) | |
8eae939f | 795 | { |
f545a38f | 796 | if (sk_rcvqueues_full(sk, skb, limit)) |
8eae939f ZY |
797 | return -ENOBUFS; |
798 | ||
a3a858ff | 799 | __sk_add_backlog(sk, skb); |
8eae939f ZY |
800 | sk->sk_backlog.len += skb->truesize; |
801 | return 0; | |
802 | } | |
803 | ||
69336bd2 | 804 | int __sk_backlog_rcv(struct sock *sk, struct sk_buff *skb); |
b4b9e355 | 805 | |
c57943a1 PZ |
806 | static inline int sk_backlog_rcv(struct sock *sk, struct sk_buff *skb) |
807 | { | |
b4b9e355 MG |
808 | if (sk_memalloc_socks() && skb_pfmemalloc(skb)) |
809 | return __sk_backlog_rcv(sk, skb); | |
810 | ||
c57943a1 PZ |
811 | return sk->sk_backlog_rcv(sk, skb); |
812 | } | |
813 | ||
c58dc01b DM |
814 | static inline void sock_rps_record_flow(const struct sock *sk) |
815 | { | |
816 | #ifdef CONFIG_RPS | |
817 | struct rps_sock_flow_table *sock_flow_table; | |
818 | ||
819 | rcu_read_lock(); | |
820 | sock_flow_table = rcu_dereference(rps_sock_flow_table); | |
821 | rps_record_sock_flow(sock_flow_table, sk->sk_rxhash); | |
822 | rcu_read_unlock(); | |
823 | #endif | |
824 | } | |
825 | ||
826 | static inline void sock_rps_reset_flow(const struct sock *sk) | |
827 | { | |
828 | #ifdef CONFIG_RPS | |
829 | struct rps_sock_flow_table *sock_flow_table; | |
830 | ||
831 | rcu_read_lock(); | |
832 | sock_flow_table = rcu_dereference(rps_sock_flow_table); | |
833 | rps_reset_sock_flow(sock_flow_table, sk->sk_rxhash); | |
834 | rcu_read_unlock(); | |
835 | #endif | |
836 | } | |
837 | ||
bdeab991 TH |
838 | static inline void sock_rps_save_rxhash(struct sock *sk, |
839 | const struct sk_buff *skb) | |
c58dc01b DM |
840 | { |
841 | #ifdef CONFIG_RPS | |
bdeab991 | 842 | if (unlikely(sk->sk_rxhash != skb->rxhash)) { |
c58dc01b | 843 | sock_rps_reset_flow(sk); |
bdeab991 | 844 | sk->sk_rxhash = skb->rxhash; |
c58dc01b DM |
845 | } |
846 | #endif | |
847 | } | |
848 | ||
bdeab991 TH |
849 | static inline void sock_rps_reset_rxhash(struct sock *sk) |
850 | { | |
851 | #ifdef CONFIG_RPS | |
852 | sock_rps_reset_flow(sk); | |
853 | sk->sk_rxhash = 0; | |
854 | #endif | |
855 | } | |
856 | ||
cfcabdcc SH |
857 | #define sk_wait_event(__sk, __timeo, __condition) \ |
858 | ({ int __rc; \ | |
859 | release_sock(__sk); \ | |
860 | __rc = __condition; \ | |
861 | if (!__rc) { \ | |
862 | *(__timeo) = schedule_timeout(*(__timeo)); \ | |
863 | } \ | |
864 | lock_sock(__sk); \ | |
865 | __rc = __condition; \ | |
866 | __rc; \ | |
867 | }) | |
1da177e4 | 868 | |
69336bd2 JP |
869 | int sk_stream_wait_connect(struct sock *sk, long *timeo_p); |
870 | int sk_stream_wait_memory(struct sock *sk, long *timeo_p); | |
871 | void sk_stream_wait_close(struct sock *sk, long timeo_p); | |
872 | int sk_stream_error(struct sock *sk, int flags, int err); | |
873 | void sk_stream_kill_queues(struct sock *sk); | |
874 | void sk_set_memalloc(struct sock *sk); | |
875 | void sk_clear_memalloc(struct sock *sk); | |
1da177e4 | 876 | |
69336bd2 | 877 | int sk_wait_data(struct sock *sk, long *timeo); |
1da177e4 | 878 | |
60236fdd | 879 | struct request_sock_ops; |
6d6ee43e | 880 | struct timewait_sock_ops; |
ab1e0a13 | 881 | struct inet_hashinfo; |
fc8717ba | 882 | struct raw_hashinfo; |
de477254 | 883 | struct module; |
2e6599cb | 884 | |
f77d6021 ED |
885 | /* |
886 | * caches using SLAB_DESTROY_BY_RCU should let .next pointer from nulls nodes | |
887 | * un-modified. Special care is taken when initializing object to zero. | |
888 | */ | |
889 | static inline void sk_prot_clear_nulls(struct sock *sk, int size) | |
890 | { | |
891 | if (offsetof(struct sock, sk_node.next) != 0) | |
892 | memset(sk, 0, offsetof(struct sock, sk_node.next)); | |
893 | memset(&sk->sk_node.pprev, 0, | |
894 | size - offsetof(struct sock, sk_node.pprev)); | |
895 | } | |
896 | ||
1da177e4 LT |
897 | /* Networking protocol blocks we attach to sockets. |
898 | * socket layer -> transport layer interface | |
899 | * transport -> network interface is defined by struct inet_proto | |
900 | */ | |
901 | struct proto { | |
dc6b9b78 | 902 | void (*close)(struct sock *sk, |
1da177e4 LT |
903 | long timeout); |
904 | int (*connect)(struct sock *sk, | |
dc6b9b78 | 905 | struct sockaddr *uaddr, |
1da177e4 LT |
906 | int addr_len); |
907 | int (*disconnect)(struct sock *sk, int flags); | |
908 | ||
dc6b9b78 | 909 | struct sock * (*accept)(struct sock *sk, int flags, int *err); |
1da177e4 LT |
910 | |
911 | int (*ioctl)(struct sock *sk, int cmd, | |
912 | unsigned long arg); | |
913 | int (*init)(struct sock *sk); | |
7d06b2e0 | 914 | void (*destroy)(struct sock *sk); |
1da177e4 | 915 | void (*shutdown)(struct sock *sk, int how); |
dc6b9b78 | 916 | int (*setsockopt)(struct sock *sk, int level, |
1da177e4 | 917 | int optname, char __user *optval, |
b7058842 | 918 | unsigned int optlen); |
dc6b9b78 ED |
919 | int (*getsockopt)(struct sock *sk, int level, |
920 | int optname, char __user *optval, | |
921 | int __user *option); | |
af01d537 | 922 | #ifdef CONFIG_COMPAT |
3fdadf7d DM |
923 | int (*compat_setsockopt)(struct sock *sk, |
924 | int level, | |
925 | int optname, char __user *optval, | |
b7058842 | 926 | unsigned int optlen); |
3fdadf7d DM |
927 | int (*compat_getsockopt)(struct sock *sk, |
928 | int level, | |
929 | int optname, char __user *optval, | |
930 | int __user *option); | |
709b46e8 EB |
931 | int (*compat_ioctl)(struct sock *sk, |
932 | unsigned int cmd, unsigned long arg); | |
af01d537 | 933 | #endif |
1da177e4 LT |
934 | int (*sendmsg)(struct kiocb *iocb, struct sock *sk, |
935 | struct msghdr *msg, size_t len); | |
936 | int (*recvmsg)(struct kiocb *iocb, struct sock *sk, | |
937 | struct msghdr *msg, | |
dc6b9b78 ED |
938 | size_t len, int noblock, int flags, |
939 | int *addr_len); | |
1da177e4 LT |
940 | int (*sendpage)(struct sock *sk, struct page *page, |
941 | int offset, size_t size, int flags); | |
dc6b9b78 | 942 | int (*bind)(struct sock *sk, |
1da177e4 LT |
943 | struct sockaddr *uaddr, int addr_len); |
944 | ||
dc6b9b78 | 945 | int (*backlog_rcv) (struct sock *sk, |
1da177e4 LT |
946 | struct sk_buff *skb); |
947 | ||
46d3ceab | 948 | void (*release_cb)(struct sock *sk); |
563d34d0 | 949 | void (*mtu_reduced)(struct sock *sk); |
46d3ceab | 950 | |
1da177e4 LT |
951 | /* Keeping track of sk's, looking them up, and port selection methods. */ |
952 | void (*hash)(struct sock *sk); | |
953 | void (*unhash)(struct sock *sk); | |
719f8358 | 954 | void (*rehash)(struct sock *sk); |
1da177e4 | 955 | int (*get_port)(struct sock *sk, unsigned short snum); |
fcbdf09d | 956 | void (*clear_sk)(struct sock *sk, int size); |
1da177e4 | 957 | |
286ab3d4 | 958 | /* Keeping track of sockets in use */ |
65f76517 | 959 | #ifdef CONFIG_PROC_FS |
13ff3d6f | 960 | unsigned int inuse_idx; |
65f76517 | 961 | #endif |
ebb53d75 | 962 | |
c9bee3b7 | 963 | bool (*stream_memory_free)(const struct sock *sk); |
1da177e4 | 964 | /* Memory pressure */ |
5c52ba17 | 965 | void (*enter_memory_pressure)(struct sock *sk); |
8d987e5c | 966 | atomic_long_t *memory_allocated; /* Current allocated memory. */ |
1748376b | 967 | struct percpu_counter *sockets_allocated; /* Current number of sockets. */ |
1da177e4 LT |
968 | /* |
969 | * Pressure flag: try to collapse. | |
970 | * Technical note: it is used by multiple contexts non atomically. | |
3ab224be | 971 | * All the __sk_mem_schedule() is of this nature: accounting |
1da177e4 LT |
972 | * is strict, actions are advisory and have some latency. |
973 | */ | |
974 | int *memory_pressure; | |
8d987e5c | 975 | long *sysctl_mem; |
1da177e4 LT |
976 | int *sysctl_wmem; |
977 | int *sysctl_rmem; | |
978 | int max_header; | |
7ba42910 | 979 | bool no_autobind; |
1da177e4 | 980 | |
271b72c7 | 981 | struct kmem_cache *slab; |
1da177e4 | 982 | unsigned int obj_size; |
271b72c7 | 983 | int slab_flags; |
1da177e4 | 984 | |
dd24c001 | 985 | struct percpu_counter *orphan_count; |
8feaf0c0 | 986 | |
60236fdd | 987 | struct request_sock_ops *rsk_prot; |
6d6ee43e | 988 | struct timewait_sock_ops *twsk_prot; |
2e6599cb | 989 | |
39d8cda7 PE |
990 | union { |
991 | struct inet_hashinfo *hashinfo; | |
645ca708 | 992 | struct udp_table *udp_table; |
fc8717ba | 993 | struct raw_hashinfo *raw_hash; |
39d8cda7 | 994 | } h; |
ab1e0a13 | 995 | |
1da177e4 LT |
996 | struct module *owner; |
997 | ||
998 | char name[32]; | |
999 | ||
1000 | struct list_head node; | |
e6848976 ACM |
1001 | #ifdef SOCK_REFCNT_DEBUG |
1002 | atomic_t socks; | |
1003 | #endif | |
c255a458 | 1004 | #ifdef CONFIG_MEMCG_KMEM |
e1aab161 GC |
1005 | /* |
1006 | * cgroup specific init/deinit functions. Called once for all | |
1007 | * protocols that implement it, from cgroups populate function. | |
1008 | * This function has to setup any files the protocol want to | |
1009 | * appear in the kmem cgroup filesystem. | |
1010 | */ | |
1d62e436 | 1011 | int (*init_cgroup)(struct mem_cgroup *memcg, |
e1aab161 | 1012 | struct cgroup_subsys *ss); |
1d62e436 | 1013 | void (*destroy_cgroup)(struct mem_cgroup *memcg); |
e1aab161 GC |
1014 | struct cg_proto *(*proto_cgroup)(struct mem_cgroup *memcg); |
1015 | #endif | |
1016 | }; | |
1017 | ||
3f134619 GC |
1018 | /* |
1019 | * Bits in struct cg_proto.flags | |
1020 | */ | |
1021 | enum cg_proto_flags { | |
1022 | /* Currently active and new sockets should be assigned to cgroups */ | |
1023 | MEMCG_SOCK_ACTIVE, | |
1024 | /* It was ever activated; we must disarm static keys on destruction */ | |
1025 | MEMCG_SOCK_ACTIVATED, | |
1026 | }; | |
1027 | ||
e1aab161 GC |
1028 | struct cg_proto { |
1029 | void (*enter_memory_pressure)(struct sock *sk); | |
1030 | struct res_counter *memory_allocated; /* Current allocated memory. */ | |
1031 | struct percpu_counter *sockets_allocated; /* Current number of sockets. */ | |
1032 | int *memory_pressure; | |
1033 | long *sysctl_mem; | |
3f134619 | 1034 | unsigned long flags; |
e1aab161 GC |
1035 | /* |
1036 | * memcg field is used to find which memcg we belong directly | |
1037 | * Each memcg struct can hold more than one cg_proto, so container_of | |
1038 | * won't really cut. | |
1039 | * | |
1040 | * The elegant solution would be having an inverse function to | |
1041 | * proto_cgroup in struct proto, but that means polluting the structure | |
1042 | * for everybody, instead of just for memcg users. | |
1043 | */ | |
1044 | struct mem_cgroup *memcg; | |
1da177e4 LT |
1045 | }; |
1046 | ||
69336bd2 JP |
1047 | int proto_register(struct proto *prot, int alloc_slab); |
1048 | void proto_unregister(struct proto *prot); | |
1da177e4 | 1049 | |
3f134619 GC |
1050 | static inline bool memcg_proto_active(struct cg_proto *cg_proto) |
1051 | { | |
1052 | return test_bit(MEMCG_SOCK_ACTIVE, &cg_proto->flags); | |
1053 | } | |
1054 | ||
1055 | static inline bool memcg_proto_activated(struct cg_proto *cg_proto) | |
1056 | { | |
1057 | return test_bit(MEMCG_SOCK_ACTIVATED, &cg_proto->flags); | |
1058 | } | |
1059 | ||
e6848976 ACM |
1060 | #ifdef SOCK_REFCNT_DEBUG |
1061 | static inline void sk_refcnt_debug_inc(struct sock *sk) | |
1062 | { | |
1063 | atomic_inc(&sk->sk_prot->socks); | |
1064 | } | |
1065 | ||
1066 | static inline void sk_refcnt_debug_dec(struct sock *sk) | |
1067 | { | |
1068 | atomic_dec(&sk->sk_prot->socks); | |
1069 | printk(KERN_DEBUG "%s socket %p released, %d are still alive\n", | |
1070 | sk->sk_prot->name, sk, atomic_read(&sk->sk_prot->socks)); | |
1071 | } | |
1072 | ||
dec34fb0 | 1073 | static inline void sk_refcnt_debug_release(const struct sock *sk) |
e6848976 ACM |
1074 | { |
1075 | if (atomic_read(&sk->sk_refcnt) != 1) | |
1076 | printk(KERN_DEBUG "Destruction of the %s socket %p delayed, refcnt=%d\n", | |
1077 | sk->sk_prot->name, sk, atomic_read(&sk->sk_refcnt)); | |
1078 | } | |
1079 | #else /* SOCK_REFCNT_DEBUG */ | |
1080 | #define sk_refcnt_debug_inc(sk) do { } while (0) | |
1081 | #define sk_refcnt_debug_dec(sk) do { } while (0) | |
1082 | #define sk_refcnt_debug_release(sk) do { } while (0) | |
1083 | #endif /* SOCK_REFCNT_DEBUG */ | |
1084 | ||
c255a458 | 1085 | #if defined(CONFIG_MEMCG_KMEM) && defined(CONFIG_NET) |
c5905afb | 1086 | extern struct static_key memcg_socket_limit_enabled; |
e1aab161 GC |
1087 | static inline struct cg_proto *parent_cg_proto(struct proto *proto, |
1088 | struct cg_proto *cg_proto) | |
1089 | { | |
1090 | return proto->proto_cgroup(parent_mem_cgroup(cg_proto->memcg)); | |
1091 | } | |
c5905afb | 1092 | #define mem_cgroup_sockets_enabled static_key_false(&memcg_socket_limit_enabled) |
e1aab161 GC |
1093 | #else |
1094 | #define mem_cgroup_sockets_enabled 0 | |
1095 | static inline struct cg_proto *parent_cg_proto(struct proto *proto, | |
1096 | struct cg_proto *cg_proto) | |
1097 | { | |
1098 | return NULL; | |
1099 | } | |
1100 | #endif | |
1101 | ||
c9bee3b7 ED |
1102 | static inline bool sk_stream_memory_free(const struct sock *sk) |
1103 | { | |
1104 | if (sk->sk_wmem_queued >= sk->sk_sndbuf) | |
1105 | return false; | |
1106 | ||
1107 | return sk->sk_prot->stream_memory_free ? | |
1108 | sk->sk_prot->stream_memory_free(sk) : true; | |
1109 | } | |
1110 | ||
64dc6130 ED |
1111 | static inline bool sk_stream_is_writeable(const struct sock *sk) |
1112 | { | |
c9bee3b7 ED |
1113 | return sk_stream_wspace(sk) >= sk_stream_min_wspace(sk) && |
1114 | sk_stream_memory_free(sk); | |
64dc6130 | 1115 | } |
e1aab161 | 1116 | |
c9bee3b7 | 1117 | |
180d8cd9 GC |
1118 | static inline bool sk_has_memory_pressure(const struct sock *sk) |
1119 | { | |
1120 | return sk->sk_prot->memory_pressure != NULL; | |
1121 | } | |
1122 | ||
1123 | static inline bool sk_under_memory_pressure(const struct sock *sk) | |
1124 | { | |
1125 | if (!sk->sk_prot->memory_pressure) | |
1126 | return false; | |
e1aab161 GC |
1127 | |
1128 | if (mem_cgroup_sockets_enabled && sk->sk_cgrp) | |
1129 | return !!*sk->sk_cgrp->memory_pressure; | |
1130 | ||
180d8cd9 GC |
1131 | return !!*sk->sk_prot->memory_pressure; |
1132 | } | |
1133 | ||
1134 | static inline void sk_leave_memory_pressure(struct sock *sk) | |
1135 | { | |
1136 | int *memory_pressure = sk->sk_prot->memory_pressure; | |
1137 | ||
e1aab161 GC |
1138 | if (!memory_pressure) |
1139 | return; | |
1140 | ||
1141 | if (*memory_pressure) | |
180d8cd9 | 1142 | *memory_pressure = 0; |
e1aab161 GC |
1143 | |
1144 | if (mem_cgroup_sockets_enabled && sk->sk_cgrp) { | |
1145 | struct cg_proto *cg_proto = sk->sk_cgrp; | |
1146 | struct proto *prot = sk->sk_prot; | |
1147 | ||
1148 | for (; cg_proto; cg_proto = parent_cg_proto(prot, cg_proto)) | |
1149 | if (*cg_proto->memory_pressure) | |
1150 | *cg_proto->memory_pressure = 0; | |
1151 | } | |
1152 | ||
180d8cd9 GC |
1153 | } |
1154 | ||
1155 | static inline void sk_enter_memory_pressure(struct sock *sk) | |
1156 | { | |
e1aab161 GC |
1157 | if (!sk->sk_prot->enter_memory_pressure) |
1158 | return; | |
1159 | ||
1160 | if (mem_cgroup_sockets_enabled && sk->sk_cgrp) { | |
1161 | struct cg_proto *cg_proto = sk->sk_cgrp; | |
1162 | struct proto *prot = sk->sk_prot; | |
1163 | ||
1164 | for (; cg_proto; cg_proto = parent_cg_proto(prot, cg_proto)) | |
1165 | cg_proto->enter_memory_pressure(sk); | |
1166 | } | |
1167 | ||
1168 | sk->sk_prot->enter_memory_pressure(sk); | |
180d8cd9 GC |
1169 | } |
1170 | ||
1171 | static inline long sk_prot_mem_limits(const struct sock *sk, int index) | |
1172 | { | |
1173 | long *prot = sk->sk_prot->sysctl_mem; | |
e1aab161 GC |
1174 | if (mem_cgroup_sockets_enabled && sk->sk_cgrp) |
1175 | prot = sk->sk_cgrp->sysctl_mem; | |
180d8cd9 GC |
1176 | return prot[index]; |
1177 | } | |
1178 | ||
e1aab161 GC |
1179 | static inline void memcg_memory_allocated_add(struct cg_proto *prot, |
1180 | unsigned long amt, | |
1181 | int *parent_status) | |
1182 | { | |
1183 | struct res_counter *fail; | |
1184 | int ret; | |
1185 | ||
0e90b31f GC |
1186 | ret = res_counter_charge_nofail(prot->memory_allocated, |
1187 | amt << PAGE_SHIFT, &fail); | |
e1aab161 GC |
1188 | if (ret < 0) |
1189 | *parent_status = OVER_LIMIT; | |
1190 | } | |
1191 | ||
1192 | static inline void memcg_memory_allocated_sub(struct cg_proto *prot, | |
1193 | unsigned long amt) | |
1194 | { | |
1195 | res_counter_uncharge(prot->memory_allocated, amt << PAGE_SHIFT); | |
1196 | } | |
1197 | ||
1198 | static inline u64 memcg_memory_allocated_read(struct cg_proto *prot) | |
1199 | { | |
1200 | u64 ret; | |
1201 | ret = res_counter_read_u64(prot->memory_allocated, RES_USAGE); | |
1202 | return ret >> PAGE_SHIFT; | |
1203 | } | |
1204 | ||
180d8cd9 GC |
1205 | static inline long |
1206 | sk_memory_allocated(const struct sock *sk) | |
1207 | { | |
1208 | struct proto *prot = sk->sk_prot; | |
e1aab161 GC |
1209 | if (mem_cgroup_sockets_enabled && sk->sk_cgrp) |
1210 | return memcg_memory_allocated_read(sk->sk_cgrp); | |
1211 | ||
180d8cd9 GC |
1212 | return atomic_long_read(prot->memory_allocated); |
1213 | } | |
1214 | ||
1215 | static inline long | |
e1aab161 | 1216 | sk_memory_allocated_add(struct sock *sk, int amt, int *parent_status) |
180d8cd9 GC |
1217 | { |
1218 | struct proto *prot = sk->sk_prot; | |
e1aab161 GC |
1219 | |
1220 | if (mem_cgroup_sockets_enabled && sk->sk_cgrp) { | |
1221 | memcg_memory_allocated_add(sk->sk_cgrp, amt, parent_status); | |
1222 | /* update the root cgroup regardless */ | |
1223 | atomic_long_add_return(amt, prot->memory_allocated); | |
1224 | return memcg_memory_allocated_read(sk->sk_cgrp); | |
1225 | } | |
1226 | ||
180d8cd9 GC |
1227 | return atomic_long_add_return(amt, prot->memory_allocated); |
1228 | } | |
1229 | ||
1230 | static inline void | |
0e90b31f | 1231 | sk_memory_allocated_sub(struct sock *sk, int amt) |
180d8cd9 GC |
1232 | { |
1233 | struct proto *prot = sk->sk_prot; | |
e1aab161 | 1234 | |
0e90b31f | 1235 | if (mem_cgroup_sockets_enabled && sk->sk_cgrp) |
e1aab161 GC |
1236 | memcg_memory_allocated_sub(sk->sk_cgrp, amt); |
1237 | ||
180d8cd9 GC |
1238 | atomic_long_sub(amt, prot->memory_allocated); |
1239 | } | |
1240 | ||
1241 | static inline void sk_sockets_allocated_dec(struct sock *sk) | |
1242 | { | |
1243 | struct proto *prot = sk->sk_prot; | |
e1aab161 GC |
1244 | |
1245 | if (mem_cgroup_sockets_enabled && sk->sk_cgrp) { | |
1246 | struct cg_proto *cg_proto = sk->sk_cgrp; | |
1247 | ||
1248 | for (; cg_proto; cg_proto = parent_cg_proto(prot, cg_proto)) | |
1249 | percpu_counter_dec(cg_proto->sockets_allocated); | |
1250 | } | |
1251 | ||
180d8cd9 GC |
1252 | percpu_counter_dec(prot->sockets_allocated); |
1253 | } | |
1254 | ||
1255 | static inline void sk_sockets_allocated_inc(struct sock *sk) | |
1256 | { | |
1257 | struct proto *prot = sk->sk_prot; | |
e1aab161 GC |
1258 | |
1259 | if (mem_cgroup_sockets_enabled && sk->sk_cgrp) { | |
1260 | struct cg_proto *cg_proto = sk->sk_cgrp; | |
1261 | ||
1262 | for (; cg_proto; cg_proto = parent_cg_proto(prot, cg_proto)) | |
1263 | percpu_counter_inc(cg_proto->sockets_allocated); | |
1264 | } | |
1265 | ||
180d8cd9 GC |
1266 | percpu_counter_inc(prot->sockets_allocated); |
1267 | } | |
1268 | ||
1269 | static inline int | |
1270 | sk_sockets_allocated_read_positive(struct sock *sk) | |
1271 | { | |
1272 | struct proto *prot = sk->sk_prot; | |
1273 | ||
e1aab161 | 1274 | if (mem_cgroup_sockets_enabled && sk->sk_cgrp) |
518fbf9c | 1275 | return percpu_counter_read_positive(sk->sk_cgrp->sockets_allocated); |
e1aab161 | 1276 | |
518fbf9c | 1277 | return percpu_counter_read_positive(prot->sockets_allocated); |
180d8cd9 GC |
1278 | } |
1279 | ||
1280 | static inline int | |
1281 | proto_sockets_allocated_sum_positive(struct proto *prot) | |
1282 | { | |
1283 | return percpu_counter_sum_positive(prot->sockets_allocated); | |
1284 | } | |
1285 | ||
1286 | static inline long | |
1287 | proto_memory_allocated(struct proto *prot) | |
1288 | { | |
1289 | return atomic_long_read(prot->memory_allocated); | |
1290 | } | |
1291 | ||
1292 | static inline bool | |
1293 | proto_memory_pressure(struct proto *prot) | |
1294 | { | |
1295 | if (!prot->memory_pressure) | |
1296 | return false; | |
1297 | return !!*prot->memory_pressure; | |
1298 | } | |
1299 | ||
65f76517 ED |
1300 | |
1301 | #ifdef CONFIG_PROC_FS | |
1da177e4 | 1302 | /* Called with local bh disabled */ |
69336bd2 JP |
1303 | void sock_prot_inuse_add(struct net *net, struct proto *prot, int inc); |
1304 | int sock_prot_inuse_get(struct net *net, struct proto *proto); | |
65f76517 | 1305 | #else |
dc6b9b78 | 1306 | static inline void sock_prot_inuse_add(struct net *net, struct proto *prot, |
c29a0bc4 | 1307 | int inc) |
65f76517 ED |
1308 | { |
1309 | } | |
65f76517 ED |
1310 | #endif |
1311 | ||
1da177e4 | 1312 | |
614c6cb4 ACM |
1313 | /* With per-bucket locks this operation is not-atomic, so that |
1314 | * this version is not worse. | |
1315 | */ | |
1316 | static inline void __sk_prot_rehash(struct sock *sk) | |
1317 | { | |
1318 | sk->sk_prot->unhash(sk); | |
1319 | sk->sk_prot->hash(sk); | |
1320 | } | |
1321 | ||
fcbdf09d OP |
1322 | void sk_prot_clear_portaddr_nulls(struct sock *sk, int size); |
1323 | ||
1da177e4 LT |
1324 | /* About 10 seconds */ |
1325 | #define SOCK_DESTROY_TIME (10*HZ) | |
1326 | ||
1327 | /* Sockets 0-1023 can't be bound to unless you are superuser */ | |
1328 | #define PROT_SOCK 1024 | |
1329 | ||
1330 | #define SHUTDOWN_MASK 3 | |
1331 | #define RCV_SHUTDOWN 1 | |
1332 | #define SEND_SHUTDOWN 2 | |
1333 | ||
1334 | #define SOCK_SNDBUF_LOCK 1 | |
1335 | #define SOCK_RCVBUF_LOCK 2 | |
1336 | #define SOCK_BINDADDR_LOCK 4 | |
1337 | #define SOCK_BINDPORT_LOCK 8 | |
1338 | ||
1339 | /* sock_iocb: used to kick off async processing of socket ios */ | |
1340 | struct sock_iocb { | |
1341 | struct list_head list; | |
1342 | ||
1343 | int flags; | |
1344 | int size; | |
1345 | struct socket *sock; | |
1346 | struct sock *sk; | |
1347 | struct scm_cookie *scm; | |
1348 | struct msghdr *msg, async_msg; | |
1da177e4 LT |
1349 | struct kiocb *kiocb; |
1350 | }; | |
1351 | ||
1352 | static inline struct sock_iocb *kiocb_to_siocb(struct kiocb *iocb) | |
1353 | { | |
1354 | return (struct sock_iocb *)iocb->private; | |
1355 | } | |
1356 | ||
1357 | static inline struct kiocb *siocb_to_kiocb(struct sock_iocb *si) | |
1358 | { | |
1359 | return si->kiocb; | |
1360 | } | |
1361 | ||
1362 | struct socket_alloc { | |
1363 | struct socket socket; | |
1364 | struct inode vfs_inode; | |
1365 | }; | |
1366 | ||
1367 | static inline struct socket *SOCKET_I(struct inode *inode) | |
1368 | { | |
1369 | return &container_of(inode, struct socket_alloc, vfs_inode)->socket; | |
1370 | } | |
1371 | ||
1372 | static inline struct inode *SOCK_INODE(struct socket *socket) | |
1373 | { | |
1374 | return &container_of(socket, struct socket_alloc, socket)->vfs_inode; | |
1375 | } | |
1376 | ||
3ab224be HA |
1377 | /* |
1378 | * Functions for memory accounting | |
1379 | */ | |
69336bd2 JP |
1380 | int __sk_mem_schedule(struct sock *sk, int size, int kind); |
1381 | void __sk_mem_reclaim(struct sock *sk); | |
1da177e4 | 1382 | |
3ab224be HA |
1383 | #define SK_MEM_QUANTUM ((int)PAGE_SIZE) |
1384 | #define SK_MEM_QUANTUM_SHIFT ilog2(SK_MEM_QUANTUM) | |
1385 | #define SK_MEM_SEND 0 | |
1386 | #define SK_MEM_RECV 1 | |
1da177e4 | 1387 | |
3ab224be | 1388 | static inline int sk_mem_pages(int amt) |
1da177e4 | 1389 | { |
3ab224be | 1390 | return (amt + SK_MEM_QUANTUM - 1) >> SK_MEM_QUANTUM_SHIFT; |
1da177e4 LT |
1391 | } |
1392 | ||
dc6b9b78 | 1393 | static inline bool sk_has_account(struct sock *sk) |
1da177e4 | 1394 | { |
3ab224be HA |
1395 | /* return true if protocol supports memory accounting */ |
1396 | return !!sk->sk_prot->memory_allocated; | |
1da177e4 LT |
1397 | } |
1398 | ||
dc6b9b78 | 1399 | static inline bool sk_wmem_schedule(struct sock *sk, int size) |
1da177e4 | 1400 | { |
3ab224be | 1401 | if (!sk_has_account(sk)) |
dc6b9b78 | 1402 | return true; |
3ab224be HA |
1403 | return size <= sk->sk_forward_alloc || |
1404 | __sk_mem_schedule(sk, size, SK_MEM_SEND); | |
1da177e4 LT |
1405 | } |
1406 | ||
c76562b6 | 1407 | static inline bool |
35c448a8 | 1408 | sk_rmem_schedule(struct sock *sk, struct sk_buff *skb, int size) |
d80d99d6 | 1409 | { |
3ab224be | 1410 | if (!sk_has_account(sk)) |
dc6b9b78 | 1411 | return true; |
c76562b6 MG |
1412 | return size<= sk->sk_forward_alloc || |
1413 | __sk_mem_schedule(sk, size, SK_MEM_RECV) || | |
1414 | skb_pfmemalloc(skb); | |
3ab224be HA |
1415 | } |
1416 | ||
1417 | static inline void sk_mem_reclaim(struct sock *sk) | |
1418 | { | |
1419 | if (!sk_has_account(sk)) | |
1420 | return; | |
1421 | if (sk->sk_forward_alloc >= SK_MEM_QUANTUM) | |
1422 | __sk_mem_reclaim(sk); | |
1423 | } | |
1424 | ||
9993e7d3 DM |
1425 | static inline void sk_mem_reclaim_partial(struct sock *sk) |
1426 | { | |
1427 | if (!sk_has_account(sk)) | |
1428 | return; | |
1429 | if (sk->sk_forward_alloc > SK_MEM_QUANTUM) | |
1430 | __sk_mem_reclaim(sk); | |
1431 | } | |
1432 | ||
3ab224be HA |
1433 | static inline void sk_mem_charge(struct sock *sk, int size) |
1434 | { | |
1435 | if (!sk_has_account(sk)) | |
1436 | return; | |
1437 | sk->sk_forward_alloc -= size; | |
1438 | } | |
1439 | ||
1440 | static inline void sk_mem_uncharge(struct sock *sk, int size) | |
1441 | { | |
1442 | if (!sk_has_account(sk)) | |
1443 | return; | |
1444 | sk->sk_forward_alloc += size; | |
1445 | } | |
1446 | ||
1447 | static inline void sk_wmem_free_skb(struct sock *sk, struct sk_buff *skb) | |
1448 | { | |
3ab224be HA |
1449 | sock_set_flag(sk, SOCK_QUEUE_SHRUNK); |
1450 | sk->sk_wmem_queued -= skb->truesize; | |
1451 | sk_mem_uncharge(sk, skb->truesize); | |
1452 | __kfree_skb(skb); | |
d80d99d6 HX |
1453 | } |
1454 | ||
1da177e4 LT |
1455 | /* Used by processes to "lock" a socket state, so that |
1456 | * interrupts and bottom half handlers won't change it | |
1457 | * from under us. It essentially blocks any incoming | |
1458 | * packets, so that we won't get any new data or any | |
1459 | * packets that change the state of the socket. | |
1460 | * | |
1461 | * While locked, BH processing will add new packets to | |
1462 | * the backlog queue. This queue is processed by the | |
1463 | * owner of the socket lock right before it is released. | |
1464 | * | |
1465 | * Since ~2.3.5 it is also exclusive sleep lock serializing | |
1466 | * accesses from user process context. | |
1467 | */ | |
d2e9117c | 1468 | #define sock_owned_by_user(sk) ((sk)->sk_lock.owned) |
1da177e4 | 1469 | |
ed07536e PZ |
1470 | /* |
1471 | * Macro so as to not evaluate some arguments when | |
1472 | * lockdep is not enabled. | |
1473 | * | |
1474 | * Mark both the sk_lock and the sk_lock.slock as a | |
1475 | * per-address-family lock class. | |
1476 | */ | |
dc6b9b78 | 1477 | #define sock_lock_init_class_and_name(sk, sname, skey, name, key) \ |
ed07536e | 1478 | do { \ |
e8f6fbf6 | 1479 | sk->sk_lock.owned = 0; \ |
ed07536e PZ |
1480 | init_waitqueue_head(&sk->sk_lock.wq); \ |
1481 | spin_lock_init(&(sk)->sk_lock.slock); \ | |
1482 | debug_check_no_locks_freed((void *)&(sk)->sk_lock, \ | |
1483 | sizeof((sk)->sk_lock)); \ | |
1484 | lockdep_set_class_and_name(&(sk)->sk_lock.slock, \ | |
dc6b9b78 | 1485 | (skey), (sname)); \ |
ed07536e PZ |
1486 | lockdep_init_map(&(sk)->sk_lock.dep_map, (name), (key), 0); \ |
1487 | } while (0) | |
1488 | ||
69336bd2 | 1489 | void lock_sock_nested(struct sock *sk, int subclass); |
fcc70d5f PZ |
1490 | |
1491 | static inline void lock_sock(struct sock *sk) | |
1492 | { | |
1493 | lock_sock_nested(sk, 0); | |
1494 | } | |
1495 | ||
69336bd2 | 1496 | void release_sock(struct sock *sk); |
1da177e4 LT |
1497 | |
1498 | /* BH context may only use the following locking interface. */ | |
1499 | #define bh_lock_sock(__sk) spin_lock(&((__sk)->sk_lock.slock)) | |
c6366184 IM |
1500 | #define bh_lock_sock_nested(__sk) \ |
1501 | spin_lock_nested(&((__sk)->sk_lock.slock), \ | |
1502 | SINGLE_DEPTH_NESTING) | |
1da177e4 LT |
1503 | #define bh_unlock_sock(__sk) spin_unlock(&((__sk)->sk_lock.slock)) |
1504 | ||
69336bd2 | 1505 | bool lock_sock_fast(struct sock *sk); |
8a74ad60 ED |
1506 | /** |
1507 | * unlock_sock_fast - complement of lock_sock_fast | |
1508 | * @sk: socket | |
1509 | * @slow: slow mode | |
1510 | * | |
1511 | * fast unlock socket for user context. | |
1512 | * If slow mode is on, we call regular release_sock() | |
1513 | */ | |
1514 | static inline void unlock_sock_fast(struct sock *sk, bool slow) | |
4b0b72f7 | 1515 | { |
8a74ad60 ED |
1516 | if (slow) |
1517 | release_sock(sk); | |
1518 | else | |
1519 | spin_unlock_bh(&sk->sk_lock.slock); | |
4b0b72f7 ED |
1520 | } |
1521 | ||
4b0b72f7 | 1522 | |
69336bd2 JP |
1523 | struct sock *sk_alloc(struct net *net, int family, gfp_t priority, |
1524 | struct proto *prot); | |
1525 | void sk_free(struct sock *sk); | |
1526 | void sk_release_kernel(struct sock *sk); | |
1527 | struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority); | |
1528 | ||
1529 | struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force, | |
1530 | gfp_t priority); | |
1531 | struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force, | |
1532 | gfp_t priority); | |
1533 | void sock_wfree(struct sk_buff *skb); | |
1534 | void skb_orphan_partial(struct sk_buff *skb); | |
1535 | void sock_rfree(struct sk_buff *skb); | |
1536 | void sock_edemux(struct sk_buff *skb); | |
1537 | ||
1538 | int sock_setsockopt(struct socket *sock, int level, int op, | |
1539 | char __user *optval, unsigned int optlen); | |
1540 | ||
1541 | int sock_getsockopt(struct socket *sock, int level, int op, | |
1542 | char __user *optval, int __user *optlen); | |
1543 | struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size, | |
1544 | int noblock, int *errcode); | |
1545 | struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len, | |
1546 | unsigned long data_len, int noblock, | |
1547 | int *errcode, int max_page_order); | |
1548 | void *sock_kmalloc(struct sock *sk, int size, gfp_t priority); | |
1549 | void sock_kfree_s(struct sock *sk, void *mem, int size); | |
1550 | void sk_send_sigurg(struct sock *sk); | |
1da177e4 LT |
1551 | |
1552 | /* | |
1553 | * Functions to fill in entries in struct proto_ops when a protocol | |
1554 | * does not implement a particular function. | |
1555 | */ | |
69336bd2 JP |
1556 | int sock_no_bind(struct socket *, struct sockaddr *, int); |
1557 | int sock_no_connect(struct socket *, struct sockaddr *, int, int); | |
1558 | int sock_no_socketpair(struct socket *, struct socket *); | |
1559 | int sock_no_accept(struct socket *, struct socket *, int); | |
1560 | int sock_no_getname(struct socket *, struct sockaddr *, int *, int); | |
1561 | unsigned int sock_no_poll(struct file *, struct socket *, | |
1562 | struct poll_table_struct *); | |
1563 | int sock_no_ioctl(struct socket *, unsigned int, unsigned long); | |
1564 | int sock_no_listen(struct socket *, int); | |
1565 | int sock_no_shutdown(struct socket *, int); | |
1566 | int sock_no_getsockopt(struct socket *, int , int, char __user *, int __user *); | |
1567 | int sock_no_setsockopt(struct socket *, int, int, char __user *, unsigned int); | |
1568 | int sock_no_sendmsg(struct kiocb *, struct socket *, struct msghdr *, size_t); | |
1569 | int sock_no_recvmsg(struct kiocb *, struct socket *, struct msghdr *, size_t, | |
1570 | int); | |
1571 | int sock_no_mmap(struct file *file, struct socket *sock, | |
1572 | struct vm_area_struct *vma); | |
1573 | ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, | |
1574 | size_t size, int flags); | |
1da177e4 LT |
1575 | |
1576 | /* | |
1577 | * Functions to fill in entries in struct proto_ops when a protocol | |
1578 | * uses the inet style. | |
1579 | */ | |
69336bd2 | 1580 | int sock_common_getsockopt(struct socket *sock, int level, int optname, |
1da177e4 | 1581 | char __user *optval, int __user *optlen); |
69336bd2 | 1582 | int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock, |
1da177e4 | 1583 | struct msghdr *msg, size_t size, int flags); |
69336bd2 | 1584 | int sock_common_setsockopt(struct socket *sock, int level, int optname, |
b7058842 | 1585 | char __user *optval, unsigned int optlen); |
69336bd2 | 1586 | int compat_sock_common_getsockopt(struct socket *sock, int level, |
3fdadf7d | 1587 | int optname, char __user *optval, int __user *optlen); |
69336bd2 | 1588 | int compat_sock_common_setsockopt(struct socket *sock, int level, |
b7058842 | 1589 | int optname, char __user *optval, unsigned int optlen); |
1da177e4 | 1590 | |
69336bd2 | 1591 | void sk_common_release(struct sock *sk); |
1da177e4 LT |
1592 | |
1593 | /* | |
1594 | * Default socket callbacks and setup code | |
1595 | */ | |
dc6b9b78 | 1596 | |
1da177e4 | 1597 | /* Initialise core socket variables */ |
69336bd2 | 1598 | void sock_init_data(struct socket *sock, struct sock *sk); |
1da177e4 | 1599 | |
69336bd2 | 1600 | void sk_filter_release_rcu(struct rcu_head *rcu); |
46bcf14f | 1601 | |
dc9b3346 | 1602 | /** |
1a5778aa | 1603 | * sk_filter_release - release a socket filter |
dc9b3346 PB |
1604 | * @fp: filter to remove |
1605 | * | |
1606 | * Remove a filter from a socket and release its resources. | |
1607 | */ | |
1608 | ||
309dd5fc PE |
1609 | static inline void sk_filter_release(struct sk_filter *fp) |
1610 | { | |
1611 | if (atomic_dec_and_test(&fp->refcnt)) | |
80f8f102 | 1612 | call_rcu(&fp->rcu, sk_filter_release_rcu); |
309dd5fc PE |
1613 | } |
1614 | ||
1615 | static inline void sk_filter_uncharge(struct sock *sk, struct sk_filter *fp) | |
1da177e4 | 1616 | { |
d45ed4a4 | 1617 | atomic_sub(sk_filter_size(fp->len), &sk->sk_omem_alloc); |
309dd5fc | 1618 | sk_filter_release(fp); |
1da177e4 LT |
1619 | } |
1620 | ||
1621 | static inline void sk_filter_charge(struct sock *sk, struct sk_filter *fp) | |
1622 | { | |
1623 | atomic_inc(&fp->refcnt); | |
d45ed4a4 | 1624 | atomic_add(sk_filter_size(fp->len), &sk->sk_omem_alloc); |
1da177e4 LT |
1625 | } |
1626 | ||
1627 | /* | |
1628 | * Socket reference counting postulates. | |
1629 | * | |
1630 | * * Each user of socket SHOULD hold a reference count. | |
1631 | * * Each access point to socket (an hash table bucket, reference from a list, | |
1632 | * running timer, skb in flight MUST hold a reference count. | |
1633 | * * When reference count hits 0, it means it will never increase back. | |
1634 | * * When reference count hits 0, it means that no references from | |
1635 | * outside exist to this socket and current process on current CPU | |
1636 | * is last user and may/should destroy this socket. | |
1637 | * * sk_free is called from any context: process, BH, IRQ. When | |
1638 | * it is called, socket has no references from outside -> sk_free | |
1639 | * may release descendant resources allocated by the socket, but | |
1640 | * to the time when it is called, socket is NOT referenced by any | |
1641 | * hash tables, lists etc. | |
1642 | * * Packets, delivered from outside (from network or from another process) | |
1643 | * and enqueued on receive/error queues SHOULD NOT grab reference count, | |
1644 | * when they sit in queue. Otherwise, packets will leak to hole, when | |
1645 | * socket is looked up by one cpu and unhasing is made by another CPU. | |
1646 | * It is true for udp/raw, netlink (leak to receive and error queues), tcp | |
1647 | * (leak to backlog). Packet socket does all the processing inside | |
1648 | * BR_NETPROTO_LOCK, so that it has not this race condition. UNIX sockets | |
1649 | * use separate SMP lock, so that they are prone too. | |
1650 | */ | |
1651 | ||
1652 | /* Ungrab socket and destroy it, if it was the last reference. */ | |
1653 | static inline void sock_put(struct sock *sk) | |
1654 | { | |
1655 | if (atomic_dec_and_test(&sk->sk_refcnt)) | |
1656 | sk_free(sk); | |
1657 | } | |
05dbc7b5 ED |
1658 | /* Generic version of sock_put(), dealing with all sockets |
1659 | * (TCP_TIMEWAIT, ESTABLISHED...) | |
1660 | */ | |
1661 | void sock_gen_put(struct sock *sk); | |
1da177e4 | 1662 | |
69336bd2 | 1663 | int sk_receive_skb(struct sock *sk, struct sk_buff *skb, const int nested); |
25995ff5 | 1664 | |
e022f0b4 KK |
1665 | static inline void sk_tx_queue_set(struct sock *sk, int tx_queue) |
1666 | { | |
1667 | sk->sk_tx_queue_mapping = tx_queue; | |
1668 | } | |
1669 | ||
1670 | static inline void sk_tx_queue_clear(struct sock *sk) | |
1671 | { | |
1672 | sk->sk_tx_queue_mapping = -1; | |
1673 | } | |
1674 | ||
1675 | static inline int sk_tx_queue_get(const struct sock *sk) | |
1676 | { | |
b0f77d0e | 1677 | return sk ? sk->sk_tx_queue_mapping : -1; |
e022f0b4 KK |
1678 | } |
1679 | ||
972692e0 DM |
1680 | static inline void sk_set_socket(struct sock *sk, struct socket *sock) |
1681 | { | |
e022f0b4 | 1682 | sk_tx_queue_clear(sk); |
972692e0 DM |
1683 | sk->sk_socket = sock; |
1684 | } | |
1685 | ||
aa395145 ED |
1686 | static inline wait_queue_head_t *sk_sleep(struct sock *sk) |
1687 | { | |
eaefd110 ED |
1688 | BUILD_BUG_ON(offsetof(struct socket_wq, wait) != 0); |
1689 | return &rcu_dereference_raw(sk->sk_wq)->wait; | |
aa395145 | 1690 | } |
1da177e4 LT |
1691 | /* Detach socket from process context. |
1692 | * Announce socket dead, detach it from wait queue and inode. | |
1693 | * Note that parent inode held reference count on this struct sock, | |
1694 | * we do not release it in this function, because protocol | |
1695 | * probably wants some additional cleanups or even continuing | |
1696 | * to work with this socket (TCP). | |
1697 | */ | |
1698 | static inline void sock_orphan(struct sock *sk) | |
1699 | { | |
1700 | write_lock_bh(&sk->sk_callback_lock); | |
1701 | sock_set_flag(sk, SOCK_DEAD); | |
972692e0 | 1702 | sk_set_socket(sk, NULL); |
43815482 | 1703 | sk->sk_wq = NULL; |
1da177e4 LT |
1704 | write_unlock_bh(&sk->sk_callback_lock); |
1705 | } | |
1706 | ||
1707 | static inline void sock_graft(struct sock *sk, struct socket *parent) | |
1708 | { | |
1709 | write_lock_bh(&sk->sk_callback_lock); | |
eaefd110 | 1710 | sk->sk_wq = parent->wq; |
1da177e4 | 1711 | parent->sk = sk; |
972692e0 | 1712 | sk_set_socket(sk, parent); |
4237c75c | 1713 | security_sock_graft(sk, parent); |
1da177e4 LT |
1714 | write_unlock_bh(&sk->sk_callback_lock); |
1715 | } | |
1716 | ||
69336bd2 JP |
1717 | kuid_t sock_i_uid(struct sock *sk); |
1718 | unsigned long sock_i_ino(struct sock *sk); | |
1da177e4 LT |
1719 | |
1720 | static inline struct dst_entry * | |
1721 | __sk_dst_get(struct sock *sk) | |
1722 | { | |
d8bf4ca9 | 1723 | return rcu_dereference_check(sk->sk_dst_cache, sock_owned_by_user(sk) || |
f68c224f | 1724 | lockdep_is_held(&sk->sk_lock.slock)); |
1da177e4 LT |
1725 | } |
1726 | ||
1727 | static inline struct dst_entry * | |
1728 | sk_dst_get(struct sock *sk) | |
1729 | { | |
1730 | struct dst_entry *dst; | |
1731 | ||
b6c6712a ED |
1732 | rcu_read_lock(); |
1733 | dst = rcu_dereference(sk->sk_dst_cache); | |
1da177e4 LT |
1734 | if (dst) |
1735 | dst_hold(dst); | |
b6c6712a | 1736 | rcu_read_unlock(); |
1da177e4 LT |
1737 | return dst; |
1738 | } | |
1739 | ||
69336bd2 | 1740 | void sk_reset_txq(struct sock *sk); |
b6c6712a ED |
1741 | |
1742 | static inline void dst_negative_advice(struct sock *sk) | |
1743 | { | |
1744 | struct dst_entry *ndst, *dst = __sk_dst_get(sk); | |
1745 | ||
1746 | if (dst && dst->ops->negative_advice) { | |
1747 | ndst = dst->ops->negative_advice(dst); | |
1748 | ||
1749 | if (ndst != dst) { | |
1750 | rcu_assign_pointer(sk->sk_dst_cache, ndst); | |
1751 | sk_reset_txq(sk); | |
1752 | } | |
1753 | } | |
1754 | } | |
1755 | ||
1da177e4 LT |
1756 | static inline void |
1757 | __sk_dst_set(struct sock *sk, struct dst_entry *dst) | |
1758 | { | |
1759 | struct dst_entry *old_dst; | |
1760 | ||
e022f0b4 | 1761 | sk_tx_queue_clear(sk); |
0b53ff2e ED |
1762 | /* |
1763 | * This can be called while sk is owned by the caller only, | |
1764 | * with no state that can be checked in a rcu_dereference_check() cond | |
1765 | */ | |
1766 | old_dst = rcu_dereference_raw(sk->sk_dst_cache); | |
b6c6712a | 1767 | rcu_assign_pointer(sk->sk_dst_cache, dst); |
1da177e4 LT |
1768 | dst_release(old_dst); |
1769 | } | |
1770 | ||
1771 | static inline void | |
1772 | sk_dst_set(struct sock *sk, struct dst_entry *dst) | |
1773 | { | |
b6c6712a | 1774 | spin_lock(&sk->sk_dst_lock); |
1da177e4 | 1775 | __sk_dst_set(sk, dst); |
b6c6712a | 1776 | spin_unlock(&sk->sk_dst_lock); |
1da177e4 LT |
1777 | } |
1778 | ||
1779 | static inline void | |
1780 | __sk_dst_reset(struct sock *sk) | |
1781 | { | |
b6c6712a | 1782 | __sk_dst_set(sk, NULL); |
1da177e4 LT |
1783 | } |
1784 | ||
1785 | static inline void | |
1786 | sk_dst_reset(struct sock *sk) | |
1787 | { | |
b6c6712a | 1788 | spin_lock(&sk->sk_dst_lock); |
1da177e4 | 1789 | __sk_dst_reset(sk); |
b6c6712a | 1790 | spin_unlock(&sk->sk_dst_lock); |
1da177e4 LT |
1791 | } |
1792 | ||
69336bd2 | 1793 | struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie); |
1da177e4 | 1794 | |
69336bd2 | 1795 | struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie); |
1da177e4 | 1796 | |
dc6b9b78 | 1797 | static inline bool sk_can_gso(const struct sock *sk) |
bcd76111 HX |
1798 | { |
1799 | return net_gso_ok(sk->sk_route_caps, sk->sk_gso_type); | |
1800 | } | |
1801 | ||
69336bd2 | 1802 | void sk_setup_caps(struct sock *sk, struct dst_entry *dst); |
6cbb0df7 | 1803 | |
c8f44aff | 1804 | static inline void sk_nocaps_add(struct sock *sk, netdev_features_t flags) |
a465419b ED |
1805 | { |
1806 | sk->sk_route_nocaps |= flags; | |
1807 | sk->sk_route_caps &= ~flags; | |
1808 | } | |
1809 | ||
c6e1a0d1 TH |
1810 | static inline int skb_do_copy_data_nocache(struct sock *sk, struct sk_buff *skb, |
1811 | char __user *from, char *to, | |
912d398d | 1812 | int copy, int offset) |
c6e1a0d1 TH |
1813 | { |
1814 | if (skb->ip_summed == CHECKSUM_NONE) { | |
1815 | int err = 0; | |
1816 | __wsum csum = csum_and_copy_from_user(from, to, copy, 0, &err); | |
1817 | if (err) | |
1818 | return err; | |
912d398d | 1819 | skb->csum = csum_block_add(skb->csum, csum, offset); |
c6e1a0d1 TH |
1820 | } else if (sk->sk_route_caps & NETIF_F_NOCACHE_COPY) { |
1821 | if (!access_ok(VERIFY_READ, from, copy) || | |
1822 | __copy_from_user_nocache(to, from, copy)) | |
1823 | return -EFAULT; | |
1824 | } else if (copy_from_user(to, from, copy)) | |
1825 | return -EFAULT; | |
1826 | ||
1827 | return 0; | |
1828 | } | |
1829 | ||
1830 | static inline int skb_add_data_nocache(struct sock *sk, struct sk_buff *skb, | |
1831 | char __user *from, int copy) | |
1832 | { | |
912d398d | 1833 | int err, offset = skb->len; |
c6e1a0d1 | 1834 | |
912d398d WY |
1835 | err = skb_do_copy_data_nocache(sk, skb, from, skb_put(skb, copy), |
1836 | copy, offset); | |
c6e1a0d1 | 1837 | if (err) |
912d398d | 1838 | __skb_trim(skb, offset); |
c6e1a0d1 TH |
1839 | |
1840 | return err; | |
1841 | } | |
1842 | ||
1843 | static inline int skb_copy_to_page_nocache(struct sock *sk, char __user *from, | |
1844 | struct sk_buff *skb, | |
1845 | struct page *page, | |
1846 | int off, int copy) | |
1847 | { | |
1848 | int err; | |
1849 | ||
912d398d WY |
1850 | err = skb_do_copy_data_nocache(sk, skb, from, page_address(page) + off, |
1851 | copy, skb->len); | |
c6e1a0d1 TH |
1852 | if (err) |
1853 | return err; | |
1854 | ||
1855 | skb->len += copy; | |
1856 | skb->data_len += copy; | |
1857 | skb->truesize += copy; | |
1858 | sk->sk_wmem_queued += copy; | |
1859 | sk_mem_charge(sk, copy); | |
1860 | return 0; | |
1861 | } | |
1862 | ||
1da177e4 LT |
1863 | static inline int skb_copy_to_page(struct sock *sk, char __user *from, |
1864 | struct sk_buff *skb, struct page *page, | |
1865 | int off, int copy) | |
1866 | { | |
1867 | if (skb->ip_summed == CHECKSUM_NONE) { | |
1868 | int err = 0; | |
5084205f | 1869 | __wsum csum = csum_and_copy_from_user(from, |
1da177e4 LT |
1870 | page_address(page) + off, |
1871 | copy, 0, &err); | |
1872 | if (err) | |
1873 | return err; | |
1874 | skb->csum = csum_block_add(skb->csum, csum, skb->len); | |
1875 | } else if (copy_from_user(page_address(page) + off, from, copy)) | |
1876 | return -EFAULT; | |
1877 | ||
1878 | skb->len += copy; | |
1879 | skb->data_len += copy; | |
1880 | skb->truesize += copy; | |
1881 | sk->sk_wmem_queued += copy; | |
3ab224be | 1882 | sk_mem_charge(sk, copy); |
1da177e4 LT |
1883 | return 0; |
1884 | } | |
1885 | ||
c564039f ED |
1886 | /** |
1887 | * sk_wmem_alloc_get - returns write allocations | |
1888 | * @sk: socket | |
1889 | * | |
1890 | * Returns sk_wmem_alloc minus initial offset of one | |
1891 | */ | |
1892 | static inline int sk_wmem_alloc_get(const struct sock *sk) | |
1893 | { | |
1894 | return atomic_read(&sk->sk_wmem_alloc) - 1; | |
1895 | } | |
1896 | ||
1897 | /** | |
1898 | * sk_rmem_alloc_get - returns read allocations | |
1899 | * @sk: socket | |
1900 | * | |
1901 | * Returns sk_rmem_alloc | |
1902 | */ | |
1903 | static inline int sk_rmem_alloc_get(const struct sock *sk) | |
1904 | { | |
1905 | return atomic_read(&sk->sk_rmem_alloc); | |
1906 | } | |
1907 | ||
1908 | /** | |
1909 | * sk_has_allocations - check if allocations are outstanding | |
1910 | * @sk: socket | |
1911 | * | |
1912 | * Returns true if socket has write or read allocations | |
1913 | */ | |
dc6b9b78 | 1914 | static inline bool sk_has_allocations(const struct sock *sk) |
c564039f ED |
1915 | { |
1916 | return sk_wmem_alloc_get(sk) || sk_rmem_alloc_get(sk); | |
1917 | } | |
1918 | ||
a57de0b4 | 1919 | /** |
43815482 | 1920 | * wq_has_sleeper - check if there are any waiting processes |
acfbe96a | 1921 | * @wq: struct socket_wq |
a57de0b4 | 1922 | * |
43815482 | 1923 | * Returns true if socket_wq has waiting processes |
a57de0b4 | 1924 | * |
43815482 | 1925 | * The purpose of the wq_has_sleeper and sock_poll_wait is to wrap the memory |
a57de0b4 JO |
1926 | * barrier call. They were added due to the race found within the tcp code. |
1927 | * | |
1928 | * Consider following tcp code paths: | |
1929 | * | |
1930 | * CPU1 CPU2 | |
1931 | * | |
1932 | * sys_select receive packet | |
1933 | * ... ... | |
1934 | * __add_wait_queue update tp->rcv_nxt | |
1935 | * ... ... | |
1936 | * tp->rcv_nxt check sock_def_readable | |
1937 | * ... { | |
43815482 ED |
1938 | * schedule rcu_read_lock(); |
1939 | * wq = rcu_dereference(sk->sk_wq); | |
1940 | * if (wq && waitqueue_active(&wq->wait)) | |
1941 | * wake_up_interruptible(&wq->wait) | |
a57de0b4 JO |
1942 | * ... |
1943 | * } | |
1944 | * | |
1945 | * The race for tcp fires when the __add_wait_queue changes done by CPU1 stay | |
1946 | * in its cache, and so does the tp->rcv_nxt update on CPU2 side. The CPU1 | |
1947 | * could then endup calling schedule and sleep forever if there are no more | |
1948 | * data on the socket. | |
ad462769 | 1949 | * |
a57de0b4 | 1950 | */ |
43815482 | 1951 | static inline bool wq_has_sleeper(struct socket_wq *wq) |
a57de0b4 | 1952 | { |
dc6b9b78 | 1953 | /* We need to be sure we are in sync with the |
a57de0b4 JO |
1954 | * add_wait_queue modifications to the wait queue. |
1955 | * | |
1956 | * This memory barrier is paired in the sock_poll_wait. | |
1957 | */ | |
43815482 ED |
1958 | smp_mb(); |
1959 | return wq && waitqueue_active(&wq->wait); | |
a57de0b4 JO |
1960 | } |
1961 | ||
1962 | /** | |
1963 | * sock_poll_wait - place memory barrier behind the poll_wait call. | |
1964 | * @filp: file | |
1965 | * @wait_address: socket wait queue | |
1966 | * @p: poll_table | |
1967 | * | |
43815482 | 1968 | * See the comments in the wq_has_sleeper function. |
a57de0b4 JO |
1969 | */ |
1970 | static inline void sock_poll_wait(struct file *filp, | |
1971 | wait_queue_head_t *wait_address, poll_table *p) | |
1972 | { | |
626cf236 | 1973 | if (!poll_does_not_wait(p) && wait_address) { |
a57de0b4 | 1974 | poll_wait(filp, wait_address, p); |
dc6b9b78 | 1975 | /* We need to be sure we are in sync with the |
a57de0b4 JO |
1976 | * socket flags modification. |
1977 | * | |
43815482 | 1978 | * This memory barrier is paired in the wq_has_sleeper. |
dc6b9b78 | 1979 | */ |
a57de0b4 JO |
1980 | smp_mb(); |
1981 | } | |
1982 | } | |
1983 | ||
1da177e4 | 1984 | /* |
dc6b9b78 | 1985 | * Queue a received datagram if it will fit. Stream and sequenced |
1da177e4 LT |
1986 | * protocols can't normally use this as they need to fit buffers in |
1987 | * and play with them. | |
1988 | * | |
dc6b9b78 | 1989 | * Inlined as it's very short and called for pretty much every |
1da177e4 LT |
1990 | * packet ever received. |
1991 | */ | |
1992 | ||
1993 | static inline void skb_set_owner_w(struct sk_buff *skb, struct sock *sk) | |
1994 | { | |
d55d87fd | 1995 | skb_orphan(skb); |
1da177e4 LT |
1996 | skb->sk = sk; |
1997 | skb->destructor = sock_wfree; | |
2b85a34e ED |
1998 | /* |
1999 | * We used to take a refcount on sk, but following operation | |
2000 | * is enough to guarantee sk_free() wont free this sock until | |
2001 | * all in-flight packets are completed | |
2002 | */ | |
1da177e4 LT |
2003 | atomic_add(skb->truesize, &sk->sk_wmem_alloc); |
2004 | } | |
2005 | ||
2006 | static inline void skb_set_owner_r(struct sk_buff *skb, struct sock *sk) | |
2007 | { | |
d55d87fd | 2008 | skb_orphan(skb); |
1da177e4 LT |
2009 | skb->sk = sk; |
2010 | skb->destructor = sock_rfree; | |
2011 | atomic_add(skb->truesize, &sk->sk_rmem_alloc); | |
3ab224be | 2012 | sk_mem_charge(sk, skb->truesize); |
1da177e4 LT |
2013 | } |
2014 | ||
69336bd2 JP |
2015 | void sk_reset_timer(struct sock *sk, struct timer_list *timer, |
2016 | unsigned long expires); | |
1da177e4 | 2017 | |
69336bd2 | 2018 | void sk_stop_timer(struct sock *sk, struct timer_list *timer); |
1da177e4 | 2019 | |
69336bd2 | 2020 | int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb); |
1da177e4 | 2021 | |
69336bd2 | 2022 | int sock_queue_err_skb(struct sock *sk, struct sk_buff *skb); |
1da177e4 LT |
2023 | |
2024 | /* | |
2025 | * Recover an error report and clear atomically | |
2026 | */ | |
dc6b9b78 | 2027 | |
1da177e4 LT |
2028 | static inline int sock_error(struct sock *sk) |
2029 | { | |
c1cbe4b7 BL |
2030 | int err; |
2031 | if (likely(!sk->sk_err)) | |
2032 | return 0; | |
2033 | err = xchg(&sk->sk_err, 0); | |
1da177e4 LT |
2034 | return -err; |
2035 | } | |
2036 | ||
2037 | static inline unsigned long sock_wspace(struct sock *sk) | |
2038 | { | |
2039 | int amt = 0; | |
2040 | ||
2041 | if (!(sk->sk_shutdown & SEND_SHUTDOWN)) { | |
2042 | amt = sk->sk_sndbuf - atomic_read(&sk->sk_wmem_alloc); | |
dc6b9b78 | 2043 | if (amt < 0) |
1da177e4 LT |
2044 | amt = 0; |
2045 | } | |
2046 | return amt; | |
2047 | } | |
2048 | ||
2049 | static inline void sk_wake_async(struct sock *sk, int how, int band) | |
2050 | { | |
bcdce719 | 2051 | if (sock_flag(sk, SOCK_FASYNC)) |
1da177e4 LT |
2052 | sock_wake_async(sk->sk_socket, how, band); |
2053 | } | |
2054 | ||
eea86af6 DB |
2055 | /* Since sk_{r,w}mem_alloc sums skb->truesize, even a small frame might |
2056 | * need sizeof(sk_buff) + MTU + padding, unless net driver perform copybreak. | |
2057 | * Note: for send buffers, TCP works better if we can build two skbs at | |
2058 | * minimum. | |
7a91b434 | 2059 | */ |
9eb5bf83 | 2060 | #define TCP_SKB_MIN_TRUESIZE (2048 + SKB_DATA_ALIGN(sizeof(struct sk_buff))) |
eea86af6 DB |
2061 | |
2062 | #define SOCK_MIN_SNDBUF (TCP_SKB_MIN_TRUESIZE * 2) | |
2063 | #define SOCK_MIN_RCVBUF TCP_SKB_MIN_TRUESIZE | |
1da177e4 LT |
2064 | |
2065 | static inline void sk_stream_moderate_sndbuf(struct sock *sk) | |
2066 | { | |
2067 | if (!(sk->sk_userlocks & SOCK_SNDBUF_LOCK)) { | |
8df09ea3 | 2068 | sk->sk_sndbuf = min(sk->sk_sndbuf, sk->sk_wmem_queued >> 1); |
eea86af6 | 2069 | sk->sk_sndbuf = max_t(u32, sk->sk_sndbuf, SOCK_MIN_SNDBUF); |
1da177e4 LT |
2070 | } |
2071 | } | |
2072 | ||
df97c708 | 2073 | struct sk_buff *sk_stream_alloc_skb(struct sock *sk, int size, gfp_t gfp); |
1da177e4 | 2074 | |
5640f768 ED |
2075 | /** |
2076 | * sk_page_frag - return an appropriate page_frag | |
2077 | * @sk: socket | |
2078 | * | |
2079 | * If socket allocation mode allows current thread to sleep, it means its | |
2080 | * safe to use the per task page_frag instead of the per socket one. | |
2081 | */ | |
2082 | static inline struct page_frag *sk_page_frag(struct sock *sk) | |
1da177e4 | 2083 | { |
5640f768 ED |
2084 | if (sk->sk_allocation & __GFP_WAIT) |
2085 | return ¤t->task_frag; | |
1da177e4 | 2086 | |
5640f768 | 2087 | return &sk->sk_frag; |
1da177e4 LT |
2088 | } |
2089 | ||
69336bd2 | 2090 | bool sk_page_frag_refill(struct sock *sk, struct page_frag *pfrag); |
5640f768 | 2091 | |
1da177e4 LT |
2092 | /* |
2093 | * Default write policy as shown to user space via poll/select/SIGIO | |
2094 | */ | |
dc6b9b78 | 2095 | static inline bool sock_writeable(const struct sock *sk) |
1da177e4 | 2096 | { |
8df09ea3 | 2097 | return atomic_read(&sk->sk_wmem_alloc) < (sk->sk_sndbuf >> 1); |
1da177e4 LT |
2098 | } |
2099 | ||
dd0fc66f | 2100 | static inline gfp_t gfp_any(void) |
1da177e4 | 2101 | { |
99709372 | 2102 | return in_softirq() ? GFP_ATOMIC : GFP_KERNEL; |
1da177e4 LT |
2103 | } |
2104 | ||
dc6b9b78 | 2105 | static inline long sock_rcvtimeo(const struct sock *sk, bool noblock) |
1da177e4 LT |
2106 | { |
2107 | return noblock ? 0 : sk->sk_rcvtimeo; | |
2108 | } | |
2109 | ||
dc6b9b78 | 2110 | static inline long sock_sndtimeo(const struct sock *sk, bool noblock) |
1da177e4 LT |
2111 | { |
2112 | return noblock ? 0 : sk->sk_sndtimeo; | |
2113 | } | |
2114 | ||
2115 | static inline int sock_rcvlowat(const struct sock *sk, int waitall, int len) | |
2116 | { | |
2117 | return (waitall ? len : min_t(int, sk->sk_rcvlowat, len)) ? : 1; | |
2118 | } | |
2119 | ||
2120 | /* Alas, with timeout socket operations are not restartable. | |
2121 | * Compare this to poll(). | |
2122 | */ | |
2123 | static inline int sock_intr_errno(long timeo) | |
2124 | { | |
2125 | return timeo == MAX_SCHEDULE_TIMEOUT ? -ERESTARTSYS : -EINTR; | |
2126 | } | |
2127 | ||
69336bd2 JP |
2128 | void __sock_recv_timestamp(struct msghdr *msg, struct sock *sk, |
2129 | struct sk_buff *skb); | |
2130 | void __sock_recv_wifi_status(struct msghdr *msg, struct sock *sk, | |
2131 | struct sk_buff *skb); | |
92f37fd2 | 2132 | |
dc6b9b78 | 2133 | static inline void |
1da177e4 LT |
2134 | sock_recv_timestamp(struct msghdr *msg, struct sock *sk, struct sk_buff *skb) |
2135 | { | |
b7aa0bf7 | 2136 | ktime_t kt = skb->tstamp; |
20d49473 | 2137 | struct skb_shared_hwtstamps *hwtstamps = skb_hwtstamps(skb); |
a61bbcf2 | 2138 | |
20d49473 PO |
2139 | /* |
2140 | * generate control messages if | |
2141 | * - receive time stamping in software requested (SOCK_RCVTSTAMP | |
2142 | * or SOCK_TIMESTAMPING_RX_SOFTWARE) | |
2143 | * - software time stamp available and wanted | |
2144 | * (SOCK_TIMESTAMPING_SOFTWARE) | |
2145 | * - hardware time stamps available and wanted | |
2146 | * (SOCK_TIMESTAMPING_SYS_HARDWARE or | |
2147 | * SOCK_TIMESTAMPING_RAW_HARDWARE) | |
2148 | */ | |
2149 | if (sock_flag(sk, SOCK_RCVTSTAMP) || | |
2150 | sock_flag(sk, SOCK_TIMESTAMPING_RX_SOFTWARE) || | |
2151 | (kt.tv64 && sock_flag(sk, SOCK_TIMESTAMPING_SOFTWARE)) || | |
2152 | (hwtstamps->hwtstamp.tv64 && | |
2153 | sock_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE)) || | |
2154 | (hwtstamps->syststamp.tv64 && | |
2155 | sock_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE))) | |
92f37fd2 ED |
2156 | __sock_recv_timestamp(msg, sk, skb); |
2157 | else | |
b7aa0bf7 | 2158 | sk->sk_stamp = kt; |
6e3e939f JB |
2159 | |
2160 | if (sock_flag(sk, SOCK_WIFI_STATUS) && skb->wifi_acked_valid) | |
2161 | __sock_recv_wifi_status(msg, sk, skb); | |
1da177e4 LT |
2162 | } |
2163 | ||
69336bd2 JP |
2164 | void __sock_recv_ts_and_drops(struct msghdr *msg, struct sock *sk, |
2165 | struct sk_buff *skb); | |
767dd033 ED |
2166 | |
2167 | static inline void sock_recv_ts_and_drops(struct msghdr *msg, struct sock *sk, | |
2168 | struct sk_buff *skb) | |
2169 | { | |
2170 | #define FLAGS_TS_OR_DROPS ((1UL << SOCK_RXQ_OVFL) | \ | |
2171 | (1UL << SOCK_RCVTSTAMP) | \ | |
2172 | (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE) | \ | |
2173 | (1UL << SOCK_TIMESTAMPING_SOFTWARE) | \ | |
dc6b9b78 | 2174 | (1UL << SOCK_TIMESTAMPING_RAW_HARDWARE) | \ |
767dd033 ED |
2175 | (1UL << SOCK_TIMESTAMPING_SYS_HARDWARE)) |
2176 | ||
2177 | if (sk->sk_flags & FLAGS_TS_OR_DROPS) | |
2178 | __sock_recv_ts_and_drops(msg, sk, skb); | |
2179 | else | |
2180 | sk->sk_stamp = skb->tstamp; | |
2181 | } | |
3b885787 | 2182 | |
20d49473 PO |
2183 | /** |
2184 | * sock_tx_timestamp - checks whether the outgoing packet is to be time stamped | |
20d49473 | 2185 | * @sk: socket sending this packet |
2244d07b | 2186 | * @tx_flags: filled with instructions for time stamping |
20d49473 | 2187 | * |
bf84a010 | 2188 | * Currently only depends on SOCK_TIMESTAMPING* flags. |
20d49473 | 2189 | */ |
69336bd2 | 2190 | void sock_tx_timestamp(struct sock *sk, __u8 *tx_flags); |
20d49473 | 2191 | |
1da177e4 LT |
2192 | /** |
2193 | * sk_eat_skb - Release a skb if it is no longer needed | |
4dc3b16b PP |
2194 | * @sk: socket to eat this skb from |
2195 | * @skb: socket buffer to eat | |
f4b8ea78 | 2196 | * @copied_early: flag indicating whether DMA operations copied this data early |
1da177e4 LT |
2197 | * |
2198 | * This routine must be called with interrupts disabled or with the socket | |
2199 | * locked so that the sk_buff queue operation is ok. | |
2200 | */ | |
624d1164 | 2201 | #ifdef CONFIG_NET_DMA |
dc6b9b78 | 2202 | static inline void sk_eat_skb(struct sock *sk, struct sk_buff *skb, bool copied_early) |
624d1164 CL |
2203 | { |
2204 | __skb_unlink(skb, &sk->sk_receive_queue); | |
2205 | if (!copied_early) | |
2206 | __kfree_skb(skb); | |
2207 | else | |
2208 | __skb_queue_tail(&sk->sk_async_wait_queue, skb); | |
2209 | } | |
2210 | #else | |
dc6b9b78 | 2211 | static inline void sk_eat_skb(struct sock *sk, struct sk_buff *skb, bool copied_early) |
1da177e4 LT |
2212 | { |
2213 | __skb_unlink(skb, &sk->sk_receive_queue); | |
2214 | __kfree_skb(skb); | |
2215 | } | |
624d1164 | 2216 | #endif |
1da177e4 | 2217 | |
3b1e0a65 YH |
2218 | static inline |
2219 | struct net *sock_net(const struct sock *sk) | |
2220 | { | |
c2d9ba9b | 2221 | return read_pnet(&sk->sk_net); |
3b1e0a65 YH |
2222 | } |
2223 | ||
2224 | static inline | |
f5aa23fd | 2225 | void sock_net_set(struct sock *sk, struct net *net) |
3b1e0a65 | 2226 | { |
c2d9ba9b | 2227 | write_pnet(&sk->sk_net, net); |
3b1e0a65 YH |
2228 | } |
2229 | ||
edf02087 DL |
2230 | /* |
2231 | * Kernel sockets, f.e. rtnl or icmp_socket, are a part of a namespace. | |
25985edc | 2232 | * They should not hold a reference to a namespace in order to allow |
edf02087 DL |
2233 | * to stop it. |
2234 | * Sockets after sk_change_net should be released using sk_release_kernel | |
2235 | */ | |
2236 | static inline void sk_change_net(struct sock *sk, struct net *net) | |
2237 | { | |
3b1e0a65 | 2238 | put_net(sock_net(sk)); |
65a18ec5 | 2239 | sock_net_set(sk, hold_net(net)); |
edf02087 DL |
2240 | } |
2241 | ||
23542618 KK |
2242 | static inline struct sock *skb_steal_sock(struct sk_buff *skb) |
2243 | { | |
efc27f8c | 2244 | if (skb->sk) { |
23542618 KK |
2245 | struct sock *sk = skb->sk; |
2246 | ||
2247 | skb->destructor = NULL; | |
2248 | skb->sk = NULL; | |
2249 | return sk; | |
2250 | } | |
2251 | return NULL; | |
2252 | } | |
2253 | ||
69336bd2 JP |
2254 | void sock_enable_timestamp(struct sock *sk, int flag); |
2255 | int sock_get_timestamp(struct sock *, struct timeval __user *); | |
2256 | int sock_get_timestampns(struct sock *, struct timespec __user *); | |
2257 | int sock_recv_errqueue(struct sock *sk, struct msghdr *msg, int len, int level, | |
2258 | int type); | |
1da177e4 | 2259 | |
dc6b9b78 ED |
2260 | /* |
2261 | * Enable debug/info messages | |
1da177e4 | 2262 | */ |
a2a316fd SH |
2263 | extern int net_msg_warn; |
2264 | #define NETDEBUG(fmt, args...) \ | |
2265 | do { if (net_msg_warn) printk(fmt,##args); } while (0) | |
1da177e4 | 2266 | |
a2a316fd SH |
2267 | #define LIMIT_NETDEBUG(fmt, args...) \ |
2268 | do { if (net_msg_warn && net_ratelimit()) printk(fmt,##args); } while(0) | |
1da177e4 | 2269 | |
1da177e4 LT |
2270 | extern __u32 sysctl_wmem_max; |
2271 | extern __u32 sysctl_rmem_max; | |
2272 | ||
6baf1f41 DM |
2273 | extern int sysctl_optmem_max; |
2274 | ||
20380731 ACM |
2275 | extern __u32 sysctl_wmem_default; |
2276 | extern __u32 sysctl_rmem_default; | |
20380731 | 2277 | |
1da177e4 | 2278 | #endif /* _SOCK_H */ |