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