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-rw-r--r--include/net/inet_connection_sock.h276
1 files changed, 276 insertions, 0 deletions
diff --git a/include/net/inet_connection_sock.h b/include/net/inet_connection_sock.h
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+++ b/include/net/inet_connection_sock.h
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1/*
2 * NET Generic infrastructure for INET connection oriented protocols.
3 *
4 * Definitions for inet_connection_sock
5 *
6 * Authors: Many people, see the TCP sources
7 *
8 * From code originally in TCP
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version
13 * 2 of the License, or (at your option) any later version.
14 */
15#ifndef _INET_CONNECTION_SOCK_H
16#define _INET_CONNECTION_SOCK_H
17
18#include <linux/ip.h>
19#include <linux/string.h>
20#include <linux/timer.h>
21#include <net/request_sock.h>
22
23#define INET_CSK_DEBUG 1
24
25/* Cancel timers, when they are not required. */
26#undef INET_CSK_CLEAR_TIMERS
27
28struct inet_bind_bucket;
29struct inet_hashinfo;
30struct tcp_congestion_ops;
31
32/** inet_connection_sock - INET connection oriented sock
33 *
34 * @icsk_accept_queue: FIFO of established children
35 * @icsk_bind_hash: Bind node
36 * @icsk_timeout: Timeout
37 * @icsk_retransmit_timer: Resend (no ack)
38 * @icsk_rto: Retransmit timeout
39 * @icsk_ca_ops Pluggable congestion control hook
40 * @icsk_ca_state: Congestion control state
41 * @icsk_retransmits: Number of unrecovered [RTO] timeouts
42 * @icsk_pending: Scheduled timer event
43 * @icsk_backoff: Backoff
44 * @icsk_syn_retries: Number of allowed SYN (or equivalent) retries
45 * @icsk_probes_out: unanswered 0 window probes
46 * @icsk_ack: Delayed ACK control data
47 */
48struct inet_connection_sock {
49 /* inet_sock has to be the first member! */
50 struct inet_sock icsk_inet;
51 struct request_sock_queue icsk_accept_queue;
52 struct inet_bind_bucket *icsk_bind_hash;
53 unsigned long icsk_timeout;
54 struct timer_list icsk_retransmit_timer;
55 struct timer_list icsk_delack_timer;
56 __u32 icsk_rto;
57 struct tcp_congestion_ops *icsk_ca_ops;
58 __u8 icsk_ca_state;
59 __u8 icsk_retransmits;
60 __u8 icsk_pending;
61 __u8 icsk_backoff;
62 __u8 icsk_syn_retries;
63 __u8 icsk_probes_out;
64 /* 2 BYTES HOLE, TRY TO PACK! */
65 struct {
66 __u8 pending; /* ACK is pending */
67 __u8 quick; /* Scheduled number of quick acks */
68 __u8 pingpong; /* The session is interactive */
69 __u8 blocked; /* Delayed ACK was blocked by socket lock */
70 __u32 ato; /* Predicted tick of soft clock */
71 unsigned long timeout; /* Currently scheduled timeout */
72 __u32 lrcvtime; /* timestamp of last received data packet */
73 __u16 last_seg_size; /* Size of last incoming segment */
74 __u16 rcv_mss; /* MSS used for delayed ACK decisions */
75 } icsk_ack;
76 u32 icsk_ca_priv[16];
77#define ICSK_CA_PRIV_SIZE (16 * sizeof(u32))
78};
79
80#define ICSK_TIME_RETRANS 1 /* Retransmit timer */
81#define ICSK_TIME_DACK 2 /* Delayed ack timer */
82#define ICSK_TIME_PROBE0 3 /* Zero window probe timer */
83#define ICSK_TIME_KEEPOPEN 4 /* Keepalive timer */
84
85static inline struct inet_connection_sock *inet_csk(const struct sock *sk)
86{
87 return (struct inet_connection_sock *)sk;
88}
89
90static inline void *inet_csk_ca(const struct sock *sk)
91{
92 return (void *)inet_csk(sk)->icsk_ca_priv;
93}
94
95extern struct sock *inet_csk_clone(struct sock *sk,
96 const struct request_sock *req,
97 const unsigned int __nocast priority);
98
99enum inet_csk_ack_state_t {
100 ICSK_ACK_SCHED = 1,
101 ICSK_ACK_TIMER = 2,
102 ICSK_ACK_PUSHED = 4
103};
104
105extern void inet_csk_init_xmit_timers(struct sock *sk,
106 void (*retransmit_handler)(unsigned long),
107 void (*delack_handler)(unsigned long),
108 void (*keepalive_handler)(unsigned long));
109extern void inet_csk_clear_xmit_timers(struct sock *sk);
110
111static inline void inet_csk_schedule_ack(struct sock *sk)
112{
113 inet_csk(sk)->icsk_ack.pending |= ICSK_ACK_SCHED;
114}
115
116static inline int inet_csk_ack_scheduled(const struct sock *sk)
117{
118 return inet_csk(sk)->icsk_ack.pending & ICSK_ACK_SCHED;
119}
120
121static inline void inet_csk_delack_init(struct sock *sk)
122{
123 memset(&inet_csk(sk)->icsk_ack, 0, sizeof(inet_csk(sk)->icsk_ack));
124}
125
126extern void inet_csk_delete_keepalive_timer(struct sock *sk);
127extern void inet_csk_reset_keepalive_timer(struct sock *sk, unsigned long timeout);
128
129#ifdef INET_CSK_DEBUG
130extern const char inet_csk_timer_bug_msg[];
131#endif
132
133static inline void inet_csk_clear_xmit_timer(struct sock *sk, const int what)
134{
135 struct inet_connection_sock *icsk = inet_csk(sk);
136
137 if (what == ICSK_TIME_RETRANS || what == ICSK_TIME_PROBE0) {
138 icsk->icsk_pending = 0;
139#ifdef INET_CSK_CLEAR_TIMERS
140 sk_stop_timer(sk, &icsk->icsk_retransmit_timer);
141#endif
142 } else if (what == ICSK_TIME_DACK) {
143 icsk->icsk_ack.blocked = icsk->icsk_ack.pending = 0;
144#ifdef INET_CSK_CLEAR_TIMERS
145 sk_stop_timer(sk, &icsk->icsk_delack_timer);
146#endif
147 }
148#ifdef INET_CSK_DEBUG
149 else {
150 pr_debug("%s", inet_csk_timer_bug_msg);
151 }
152#endif
153}
154
155/*
156 * Reset the retransmission timer
157 */
158static inline void inet_csk_reset_xmit_timer(struct sock *sk, const int what,
159 unsigned long when,
160 const unsigned long max_when)
161{
162 struct inet_connection_sock *icsk = inet_csk(sk);
163
164 if (when > max_when) {
165#ifdef INET_CSK_DEBUG
166 pr_debug("reset_xmit_timer: sk=%p %d when=0x%lx, caller=%p\n",
167 sk, what, when, current_text_addr());
168#endif
169 when = max_when;
170 }
171
172 if (what == ICSK_TIME_RETRANS || what == ICSK_TIME_PROBE0) {
173 icsk->icsk_pending = what;
174 icsk->icsk_timeout = jiffies + when;
175 sk_reset_timer(sk, &icsk->icsk_retransmit_timer, icsk->icsk_timeout);
176 } else if (what == ICSK_TIME_DACK) {
177 icsk->icsk_ack.pending |= ICSK_ACK_TIMER;
178 icsk->icsk_ack.timeout = jiffies + when;
179 sk_reset_timer(sk, &icsk->icsk_delack_timer, icsk->icsk_ack.timeout);
180 }
181#ifdef INET_CSK_DEBUG
182 else {
183 pr_debug("%s", inet_csk_timer_bug_msg);
184 }
185#endif
186}
187
188extern struct sock *inet_csk_accept(struct sock *sk, int flags, int *err);
189
190extern struct request_sock *inet_csk_search_req(const struct sock *sk,
191 struct request_sock ***prevp,
192 const __u16 rport,
193 const __u32 raddr,
194 const __u32 laddr);
195extern int inet_csk_get_port(struct inet_hashinfo *hashinfo,
196 struct sock *sk, unsigned short snum);
197
198extern struct dst_entry* inet_csk_route_req(struct sock *sk,
199 const struct request_sock *req);
200
201static inline void inet_csk_reqsk_queue_add(struct sock *sk,
202 struct request_sock *req,
203 struct sock *child)
204{
205 reqsk_queue_add(&inet_csk(sk)->icsk_accept_queue, req, sk, child);
206}
207
208extern void inet_csk_reqsk_queue_hash_add(struct sock *sk,
209 struct request_sock *req,
210 const unsigned timeout);
211
212static inline void inet_csk_reqsk_queue_removed(struct sock *sk,
213 struct request_sock *req)
214{
215 if (reqsk_queue_removed(&inet_csk(sk)->icsk_accept_queue, req) == 0)
216 inet_csk_delete_keepalive_timer(sk);
217}
218
219static inline void inet_csk_reqsk_queue_added(struct sock *sk,
220 const unsigned long timeout)
221{
222 if (reqsk_queue_added(&inet_csk(sk)->icsk_accept_queue) == 0)
223 inet_csk_reset_keepalive_timer(sk, timeout);
224}
225
226static inline int inet_csk_reqsk_queue_len(const struct sock *sk)
227{
228 return reqsk_queue_len(&inet_csk(sk)->icsk_accept_queue);
229}
230
231static inline int inet_csk_reqsk_queue_young(const struct sock *sk)
232{
233 return reqsk_queue_len_young(&inet_csk(sk)->icsk_accept_queue);
234}
235
236static inline int inet_csk_reqsk_queue_is_full(const struct sock *sk)
237{
238 return reqsk_queue_is_full(&inet_csk(sk)->icsk_accept_queue);
239}
240
241static inline void inet_csk_reqsk_queue_unlink(struct sock *sk,
242 struct request_sock *req,
243 struct request_sock **prev)
244{
245 reqsk_queue_unlink(&inet_csk(sk)->icsk_accept_queue, req, prev);
246}
247
248static inline void inet_csk_reqsk_queue_drop(struct sock *sk,
249 struct request_sock *req,
250 struct request_sock **prev)
251{
252 inet_csk_reqsk_queue_unlink(sk, req, prev);
253 inet_csk_reqsk_queue_removed(sk, req);
254 reqsk_free(req);
255}
256
257extern void inet_csk_reqsk_queue_prune(struct sock *parent,
258 const unsigned long interval,
259 const unsigned long timeout,
260 const unsigned long max_rto);
261
262extern void inet_csk_destroy_sock(struct sock *sk);
263
264/*
265 * LISTEN is a special case for poll..
266 */
267static inline unsigned int inet_csk_listen_poll(const struct sock *sk)
268{
269 return !reqsk_queue_empty(&inet_csk(sk)->icsk_accept_queue) ?
270 (POLLIN | POLLRDNORM) : 0;
271}
272
273extern int inet_csk_listen_start(struct sock *sk, const int nr_table_entries);
274extern void inet_csk_listen_stop(struct sock *sk);
275
276#endif /* _INET_CONNECTION_SOCK_H */
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-10 17:57:46 -0500