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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 <linux/fcntl.h>
28#include <linux/mm.h>
29#include <linux/interrupt.h>
30#include <net/netrom.h>
31
32static void nr_heartbeat_expiry(unsigned long);
33static void nr_t1timer_expiry(unsigned long);
34static void nr_t2timer_expiry(unsigned long);
35static void nr_t4timer_expiry(unsigned long);
36static void nr_idletimer_expiry(unsigned long);
37
38void nr_init_timers(struct sock *sk)
39{
40 struct nr_sock *nr = nr_sk(sk);
41
42 setup_timer(&nr->t1timer, nr_t1timer_expiry, (unsigned long)sk);
43 setup_timer(&nr->t2timer, nr_t2timer_expiry, (unsigned long)sk);
44 setup_timer(&nr->t4timer, nr_t4timer_expiry, (unsigned long)sk);
45 setup_timer(&nr->idletimer, nr_idletimer_expiry, (unsigned long)sk);
46
47 /* initialized by sock_init_data */
48 sk->sk_timer.data = (unsigned long)sk;
49 sk->sk_timer.function = &nr_heartbeat_expiry;
50}
51
52void nr_start_t1timer(struct sock *sk)
53{
54 struct nr_sock *nr = nr_sk(sk);
55
56 mod_timer(&nr->t1timer, jiffies + nr->t1);
57}
58
59void nr_start_t2timer(struct sock *sk)
60{
61 struct nr_sock *nr = nr_sk(sk);
62
63 mod_timer(&nr->t2timer, jiffies + nr->t2);
64}
65
66void nr_start_t4timer(struct sock *sk)
67{
68 struct nr_sock *nr = nr_sk(sk);
69
70 mod_timer(&nr->t4timer, jiffies + nr->t4);
71}
72
73void nr_start_idletimer(struct sock *sk)
74{
75 struct nr_sock *nr = nr_sk(sk);
76
77 if (nr->idle > 0)
78 mod_timer(&nr->idletimer, jiffies + nr->idle);
79}
80
81void nr_start_heartbeat(struct sock *sk)
82{
83 mod_timer(&sk->sk_timer, jiffies + 5 * HZ);
84}
85
86void nr_stop_t1timer(struct sock *sk)
87{
88 del_timer(&nr_sk(sk)->t1timer);
89}
90
91void nr_stop_t2timer(struct sock *sk)
92{
93 del_timer(&nr_sk(sk)->t2timer);
94}
95
96void nr_stop_t4timer(struct sock *sk)
97{
98 del_timer(&nr_sk(sk)->t4timer);
99}
100
101void nr_stop_idletimer(struct sock *sk)
102{
103 del_timer(&nr_sk(sk)->idletimer);
104}
105
106void nr_stop_heartbeat(struct sock *sk)
107{
108 del_timer(&sk->sk_timer);
109}
110
111int nr_t1timer_running(struct sock *sk)
112{
113 return timer_pending(&nr_sk(sk)->t1timer);
114}
115
116static void nr_heartbeat_expiry(unsigned long param)
117{
118 struct sock *sk = (struct sock *)param;
119 struct nr_sock *nr = nr_sk(sk);
120
121 bh_lock_sock(sk);
122 switch (nr->state) {
123 case NR_STATE_0:
124 /* Magic here: If we listen() and a new link dies before it
125 is accepted() it isn't 'dead' so doesn't get removed. */
126 if (sock_flag(sk, SOCK_DESTROY) ||
127 (sk->sk_state == TCP_LISTEN && sock_flag(sk, SOCK_DEAD))) {
128 sock_hold(sk);
129 bh_unlock_sock(sk);
130 nr_destroy_socket(sk);
131 sock_put(sk);
132 return;
133 }
134 break;
135
136 case NR_STATE_3:
137 /*
138 * Check for the state of the receive buffer.
139 */
140 if (atomic_read(&sk->sk_rmem_alloc) < (sk->sk_rcvbuf / 2) &&
141 (nr->condition & NR_COND_OWN_RX_BUSY)) {
142 nr->condition &= ~NR_COND_OWN_RX_BUSY;
143 nr->condition &= ~NR_COND_ACK_PENDING;
144 nr->vl = nr->vr;
145 nr_write_internal(sk, NR_INFOACK);
146 break;
147 }
148 break;
149 }
150
151 nr_start_heartbeat(sk);
152 bh_unlock_sock(sk);
153}
154
155static void nr_t2timer_expiry(unsigned long param)
156{
157 struct sock *sk = (struct sock *)param;
158 struct nr_sock *nr = nr_sk(sk);
159
160 bh_lock_sock(sk);
161 if (nr->condition & NR_COND_ACK_PENDING) {
162 nr->condition &= ~NR_COND_ACK_PENDING;
163 nr_enquiry_response(sk);
164 }
165 bh_unlock_sock(sk);
166}
167
168static void nr_t4timer_expiry(unsigned long param)
169{
170 struct sock *sk = (struct sock *)param;
171
172 bh_lock_sock(sk);
173 nr_sk(sk)->condition &= ~NR_COND_PEER_RX_BUSY;
174 bh_unlock_sock(sk);
175}
176
177static void nr_idletimer_expiry(unsigned long param)
178{
179 struct sock *sk = (struct sock *)param;
180 struct nr_sock *nr = nr_sk(sk);
181
182 bh_lock_sock(sk);
183
184 nr_clear_queues(sk);
185
186 nr->n2count = 0;
187 nr_write_internal(sk, NR_DISCREQ);
188 nr->state = NR_STATE_2;
189
190 nr_start_t1timer(sk);
191 nr_stop_t2timer(sk);
192 nr_stop_t4timer(sk);
193
194 sk->sk_state = TCP_CLOSE;
195 sk->sk_err = 0;
196 sk->sk_shutdown |= SEND_SHUTDOWN;
197
198 if (!sock_flag(sk, SOCK_DEAD)) {
199 sk->sk_state_change(sk);
200 sock_set_flag(sk, SOCK_DEAD);
201 }
202 bh_unlock_sock(sk);
203}
204
205static void nr_t1timer_expiry(unsigned long param)
206{
207 struct sock *sk = (struct sock *)param;
208 struct nr_sock *nr = nr_sk(sk);
209
210 bh_lock_sock(sk);
211 switch (nr->state) {
212 case NR_STATE_1:
213 if (nr->n2count == nr->n2) {
214 nr_disconnect(sk, ETIMEDOUT);
215 bh_unlock_sock(sk);
216 return;
217 } else {
218 nr->n2count++;
219 nr_write_internal(sk, NR_CONNREQ);
220 }
221 break;
222
223 case NR_STATE_2:
224 if (nr->n2count == nr->n2) {
225 nr_disconnect(sk, ETIMEDOUT);
226 bh_unlock_sock(sk);
227 return;
228 } else {
229 nr->n2count++;
230 nr_write_internal(sk, NR_DISCREQ);
231 }
232 break;
233
234 case NR_STATE_3:
235 if (nr->n2count == nr->n2) {
236 nr_disconnect(sk, ETIMEDOUT);
237 bh_unlock_sock(sk);
238 return;
239 } else {
240 nr->n2count++;
241 nr_requeue_frames(sk);
242 }
243 break;
244 }
245
246 nr_start_t1timer(sk);
247 bh_unlock_sock(sk);
248}