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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 *
4 * Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
5 * Copyright (C) 2002 Ralf Baechle DO1GRB (ralf@gnu.org)
6 */
7#include <linux/errno.h>
8#include <linux/types.h>
9#include <linux/socket.h>
10#include <linux/in.h>
11#include <linux/kernel.h>
12#include <linux/jiffies.h>
13#include <linux/timer.h>
14#include <linux/string.h>
15#include <linux/sockios.h>
16#include <linux/net.h>
17#include <net/ax25.h>
18#include <linux/inet.h>
19#include <linux/netdevice.h>
20#include <linux/skbuff.h>
21#include <net/sock.h>
22#include <net/tcp_states.h>
23#include <linux/uaccess.h>
24#include <linux/fcntl.h>
25#include <linux/mm.h>
26#include <linux/interrupt.h>
27#include <net/netrom.h>
28
29static void nr_heartbeat_expiry(struct timer_list *);
30static void nr_t1timer_expiry(struct timer_list *);
31static void nr_t2timer_expiry(struct timer_list *);
32static void nr_t4timer_expiry(struct timer_list *);
33static void nr_idletimer_expiry(struct timer_list *);
34
35void nr_init_timers(struct sock *sk)
36{
37 struct nr_sock *nr = nr_sk(sk);
38
39 timer_setup(&nr->t1timer, nr_t1timer_expiry, 0);
40 timer_setup(&nr->t2timer, nr_t2timer_expiry, 0);
41 timer_setup(&nr->t4timer, nr_t4timer_expiry, 0);
42 timer_setup(&nr->idletimer, nr_idletimer_expiry, 0);
43
44 /* initialized by sock_init_data */
45 sk->sk_timer.function = nr_heartbeat_expiry;
46}
47
48void nr_start_t1timer(struct sock *sk)
49{
50 struct nr_sock *nr = nr_sk(sk);
51
52 sk_reset_timer(sk, &nr->t1timer, jiffies + nr->t1);
53}
54
55void nr_start_t2timer(struct sock *sk)
56{
57 struct nr_sock *nr = nr_sk(sk);
58
59 sk_reset_timer(sk, &nr->t2timer, jiffies + nr->t2);
60}
61
62void nr_start_t4timer(struct sock *sk)
63{
64 struct nr_sock *nr = nr_sk(sk);
65
66 sk_reset_timer(sk, &nr->t4timer, jiffies + nr->t4);
67}
68
69void nr_start_idletimer(struct sock *sk)
70{
71 struct nr_sock *nr = nr_sk(sk);
72
73 if (nr->idle > 0)
74 sk_reset_timer(sk, &nr->idletimer, jiffies + nr->idle);
75}
76
77void nr_start_heartbeat(struct sock *sk)
78{
79 sk_reset_timer(sk, &sk->sk_timer, jiffies + 5 * HZ);
80}
81
82void nr_stop_t1timer(struct sock *sk)
83{
84 sk_stop_timer(sk, &nr_sk(sk)->t1timer);
85}
86
87void nr_stop_t2timer(struct sock *sk)
88{
89 sk_stop_timer(sk, &nr_sk(sk)->t2timer);
90}
91
92void nr_stop_t4timer(struct sock *sk)
93{
94 sk_stop_timer(sk, &nr_sk(sk)->t4timer);
95}
96
97void nr_stop_idletimer(struct sock *sk)
98{
99 sk_stop_timer(sk, &nr_sk(sk)->idletimer);
100}
101
102void nr_stop_heartbeat(struct sock *sk)
103{
104 sk_stop_timer(sk, &sk->sk_timer);
105}
106
107int nr_t1timer_running(struct sock *sk)
108{
109 return timer_pending(&nr_sk(sk)->t1timer);
110}
111
112static void nr_heartbeat_expiry(struct timer_list *t)
113{
114 struct sock *sk = from_timer(sk, t, sk_timer);
115 struct nr_sock *nr = nr_sk(sk);
116
117 bh_lock_sock(sk);
118 switch (nr->state) {
119 case NR_STATE_0:
120 /* Magic here: If we listen() and a new link dies before it
121 is accepted() it isn't 'dead' so doesn't get removed. */
122 if (sock_flag(sk, SOCK_DESTROY) ||
123 (sk->sk_state == TCP_LISTEN && sock_flag(sk, SOCK_DEAD))) {
124 sock_hold(sk);
125 bh_unlock_sock(sk);
126 nr_destroy_socket(sk);
127 sock_put(sk);
128 return;
129 }
130 break;
131
132 case NR_STATE_3:
133 /*
134 * Check for the state of the receive buffer.
135 */
136 if (atomic_read(&sk->sk_rmem_alloc) < (sk->sk_rcvbuf / 2) &&
137 (nr->condition & NR_COND_OWN_RX_BUSY)) {
138 nr->condition &= ~NR_COND_OWN_RX_BUSY;
139 nr->condition &= ~NR_COND_ACK_PENDING;
140 nr->vl = nr->vr;
141 nr_write_internal(sk, NR_INFOACK);
142 break;
143 }
144 break;
145 }
146
147 nr_start_heartbeat(sk);
148 bh_unlock_sock(sk);
149}
150
151static void nr_t2timer_expiry(struct timer_list *t)
152{
153 struct nr_sock *nr = from_timer(nr, t, t2timer);
154 struct sock *sk = &nr->sock;
155
156 bh_lock_sock(sk);
157 if (nr->condition & NR_COND_ACK_PENDING) {
158 nr->condition &= ~NR_COND_ACK_PENDING;
159 nr_enquiry_response(sk);
160 }
161 bh_unlock_sock(sk);
162}
163
164static void nr_t4timer_expiry(struct timer_list *t)
165{
166 struct nr_sock *nr = from_timer(nr, t, t4timer);
167 struct sock *sk = &nr->sock;
168
169 bh_lock_sock(sk);
170 nr_sk(sk)->condition &= ~NR_COND_PEER_RX_BUSY;
171 bh_unlock_sock(sk);
172}
173
174static void nr_idletimer_expiry(struct timer_list *t)
175{
176 struct nr_sock *nr = from_timer(nr, t, idletimer);
177 struct sock *sk = &nr->sock;
178
179 bh_lock_sock(sk);
180
181 nr_clear_queues(sk);
182
183 nr->n2count = 0;
184 nr_write_internal(sk, NR_DISCREQ);
185 nr->state = NR_STATE_2;
186
187 nr_start_t1timer(sk);
188 nr_stop_t2timer(sk);
189 nr_stop_t4timer(sk);
190
191 sk->sk_state = TCP_CLOSE;
192 sk->sk_err = 0;
193 sk->sk_shutdown |= SEND_SHUTDOWN;
194
195 if (!sock_flag(sk, SOCK_DEAD)) {
196 sk->sk_state_change(sk);
197 sock_set_flag(sk, SOCK_DEAD);
198 }
199 bh_unlock_sock(sk);
200}
201
202static void nr_t1timer_expiry(struct timer_list *t)
203{
204 struct nr_sock *nr = from_timer(nr, t, t1timer);
205 struct sock *sk = &nr->sock;
206
207 bh_lock_sock(sk);
208 switch (nr->state) {
209 case NR_STATE_1:
210 if (nr->n2count == nr->n2) {
211 nr_disconnect(sk, ETIMEDOUT);
212 bh_unlock_sock(sk);
213 return;
214 } else {
215 nr->n2count++;
216 nr_write_internal(sk, NR_CONNREQ);
217 }
218 break;
219
220 case NR_STATE_2:
221 if (nr->n2count == nr->n2) {
222 nr_disconnect(sk, ETIMEDOUT);
223 bh_unlock_sock(sk);
224 return;
225 } else {
226 nr->n2count++;
227 nr_write_internal(sk, NR_DISCREQ);
228 }
229 break;
230
231 case NR_STATE_3:
232 if (nr->n2count == nr->n2) {
233 nr_disconnect(sk, ETIMEDOUT);
234 bh_unlock_sock(sk);
235 return;
236 } else {
237 nr->n2count++;
238 nr_requeue_frames(sk);
239 }
240 break;
241 }
242
243 nr_start_t1timer(sk);
244 bh_unlock_sock(sk);
245}
1/*
2 * This program is free software; you can redistribute it and/or modify
3 * it under the terms of the GNU General Public License as published by
4 * the Free Software Foundation; either version 2 of the License, or
5 * (at your option) any later version.
6 *
7 * Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
8 * Copyright (C) 2002 Ralf Baechle DO1GRB (ralf@gnu.org)
9 */
10#include <linux/errno.h>
11#include <linux/types.h>
12#include <linux/socket.h>
13#include <linux/in.h>
14#include <linux/kernel.h>
15#include <linux/jiffies.h>
16#include <linux/timer.h>
17#include <linux/string.h>
18#include <linux/sockios.h>
19#include <linux/net.h>
20#include <net/ax25.h>
21#include <linux/inet.h>
22#include <linux/netdevice.h>
23#include <linux/skbuff.h>
24#include <net/sock.h>
25#include <net/tcp_states.h>
26#include <asm/uaccess.h>
27#include <asm/system.h>
28#include <linux/fcntl.h>
29#include <linux/mm.h>
30#include <linux/interrupt.h>
31#include <net/netrom.h>
32
33static void nr_heartbeat_expiry(unsigned long);
34static void nr_t1timer_expiry(unsigned long);
35static void nr_t2timer_expiry(unsigned long);
36static void nr_t4timer_expiry(unsigned long);
37static void nr_idletimer_expiry(unsigned long);
38
39void nr_init_timers(struct sock *sk)
40{
41 struct nr_sock *nr = nr_sk(sk);
42
43 setup_timer(&nr->t1timer, nr_t1timer_expiry, (unsigned long)sk);
44 setup_timer(&nr->t2timer, nr_t2timer_expiry, (unsigned long)sk);
45 setup_timer(&nr->t4timer, nr_t4timer_expiry, (unsigned long)sk);
46 setup_timer(&nr->idletimer, nr_idletimer_expiry, (unsigned long)sk);
47
48 /* initialized by sock_init_data */
49 sk->sk_timer.data = (unsigned long)sk;
50 sk->sk_timer.function = &nr_heartbeat_expiry;
51}
52
53void nr_start_t1timer(struct sock *sk)
54{
55 struct nr_sock *nr = nr_sk(sk);
56
57 mod_timer(&nr->t1timer, jiffies + nr->t1);
58}
59
60void nr_start_t2timer(struct sock *sk)
61{
62 struct nr_sock *nr = nr_sk(sk);
63
64 mod_timer(&nr->t2timer, jiffies + nr->t2);
65}
66
67void nr_start_t4timer(struct sock *sk)
68{
69 struct nr_sock *nr = nr_sk(sk);
70
71 mod_timer(&nr->t4timer, jiffies + nr->t4);
72}
73
74void nr_start_idletimer(struct sock *sk)
75{
76 struct nr_sock *nr = nr_sk(sk);
77
78 if (nr->idle > 0)
79 mod_timer(&nr->idletimer, jiffies + nr->idle);
80}
81
82void nr_start_heartbeat(struct sock *sk)
83{
84 mod_timer(&sk->sk_timer, jiffies + 5 * HZ);
85}
86
87void nr_stop_t1timer(struct sock *sk)
88{
89 del_timer(&nr_sk(sk)->t1timer);
90}
91
92void nr_stop_t2timer(struct sock *sk)
93{
94 del_timer(&nr_sk(sk)->t2timer);
95}
96
97void nr_stop_t4timer(struct sock *sk)
98{
99 del_timer(&nr_sk(sk)->t4timer);
100}
101
102void nr_stop_idletimer(struct sock *sk)
103{
104 del_timer(&nr_sk(sk)->idletimer);
105}
106
107void nr_stop_heartbeat(struct sock *sk)
108{
109 del_timer(&sk->sk_timer);
110}
111
112int nr_t1timer_running(struct sock *sk)
113{
114 return timer_pending(&nr_sk(sk)->t1timer);
115}
116
117static void nr_heartbeat_expiry(unsigned long param)
118{
119 struct sock *sk = (struct sock *)param;
120 struct nr_sock *nr = nr_sk(sk);
121
122 bh_lock_sock(sk);
123 switch (nr->state) {
124 case NR_STATE_0:
125 /* Magic here: If we listen() and a new link dies before it
126 is accepted() it isn't 'dead' so doesn't get removed. */
127 if (sock_flag(sk, SOCK_DESTROY) ||
128 (sk->sk_state == TCP_LISTEN && sock_flag(sk, SOCK_DEAD))) {
129 sock_hold(sk);
130 bh_unlock_sock(sk);
131 nr_destroy_socket(sk);
132 sock_put(sk);
133 return;
134 }
135 break;
136
137 case NR_STATE_3:
138 /*
139 * Check for the state of the receive buffer.
140 */
141 if (atomic_read(&sk->sk_rmem_alloc) < (sk->sk_rcvbuf / 2) &&
142 (nr->condition & NR_COND_OWN_RX_BUSY)) {
143 nr->condition &= ~NR_COND_OWN_RX_BUSY;
144 nr->condition &= ~NR_COND_ACK_PENDING;
145 nr->vl = nr->vr;
146 nr_write_internal(sk, NR_INFOACK);
147 break;
148 }
149 break;
150 }
151
152 nr_start_heartbeat(sk);
153 bh_unlock_sock(sk);
154}
155
156static void nr_t2timer_expiry(unsigned long param)
157{
158 struct sock *sk = (struct sock *)param;
159 struct nr_sock *nr = nr_sk(sk);
160
161 bh_lock_sock(sk);
162 if (nr->condition & NR_COND_ACK_PENDING) {
163 nr->condition &= ~NR_COND_ACK_PENDING;
164 nr_enquiry_response(sk);
165 }
166 bh_unlock_sock(sk);
167}
168
169static void nr_t4timer_expiry(unsigned long param)
170{
171 struct sock *sk = (struct sock *)param;
172
173 bh_lock_sock(sk);
174 nr_sk(sk)->condition &= ~NR_COND_PEER_RX_BUSY;
175 bh_unlock_sock(sk);
176}
177
178static void nr_idletimer_expiry(unsigned long param)
179{
180 struct sock *sk = (struct sock *)param;
181 struct nr_sock *nr = nr_sk(sk);
182
183 bh_lock_sock(sk);
184
185 nr_clear_queues(sk);
186
187 nr->n2count = 0;
188 nr_write_internal(sk, NR_DISCREQ);
189 nr->state = NR_STATE_2;
190
191 nr_start_t1timer(sk);
192 nr_stop_t2timer(sk);
193 nr_stop_t4timer(sk);
194
195 sk->sk_state = TCP_CLOSE;
196 sk->sk_err = 0;
197 sk->sk_shutdown |= SEND_SHUTDOWN;
198
199 if (!sock_flag(sk, SOCK_DEAD)) {
200 sk->sk_state_change(sk);
201 sock_set_flag(sk, SOCK_DEAD);
202 }
203 bh_unlock_sock(sk);
204}
205
206static void nr_t1timer_expiry(unsigned long param)
207{
208 struct sock *sk = (struct sock *)param;
209 struct nr_sock *nr = nr_sk(sk);
210
211 bh_lock_sock(sk);
212 switch (nr->state) {
213 case NR_STATE_1:
214 if (nr->n2count == nr->n2) {
215 nr_disconnect(sk, ETIMEDOUT);
216 bh_unlock_sock(sk);
217 return;
218 } else {
219 nr->n2count++;
220 nr_write_internal(sk, NR_CONNREQ);
221 }
222 break;
223
224 case NR_STATE_2:
225 if (nr->n2count == nr->n2) {
226 nr_disconnect(sk, ETIMEDOUT);
227 bh_unlock_sock(sk);
228 return;
229 } else {
230 nr->n2count++;
231 nr_write_internal(sk, NR_DISCREQ);
232 }
233 break;
234
235 case NR_STATE_3:
236 if (nr->n2count == nr->n2) {
237 nr_disconnect(sk, ETIMEDOUT);
238 bh_unlock_sock(sk);
239 return;
240 } else {
241 nr->n2count++;
242 nr_requeue_frames(sk);
243 }
244 break;
245 }
246
247 nr_start_t1timer(sk);
248 bh_unlock_sock(sk);
249}