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
29 static void nr_heartbeat_expiry(struct timer_list *);
30 static void nr_t1timer_expiry(struct timer_list *);
31 static void nr_t2timer_expiry(struct timer_list *);
32 static void nr_t4timer_expiry(struct timer_list *);
33 static void nr_idletimer_expiry(struct timer_list *);
34
nr_init_timers(struct sock * sk)35 void 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
nr_start_t1timer(struct sock * sk)48 void 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
nr_start_t2timer(struct sock * sk)55 void 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
nr_start_t4timer(struct sock * sk)62 void 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
nr_start_idletimer(struct sock * sk)69 void 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
nr_start_heartbeat(struct sock * sk)77 void nr_start_heartbeat(struct sock *sk)
78 {
79 sk_reset_timer(sk, &sk->sk_timer, jiffies + 5 * HZ);
80 }
81
nr_stop_t1timer(struct sock * sk)82 void nr_stop_t1timer(struct sock *sk)
83 {
84 sk_stop_timer(sk, &nr_sk(sk)->t1timer);
85 }
86
nr_stop_t2timer(struct sock * sk)87 void nr_stop_t2timer(struct sock *sk)
88 {
89 sk_stop_timer(sk, &nr_sk(sk)->t2timer);
90 }
91
nr_stop_t4timer(struct sock * sk)92 void nr_stop_t4timer(struct sock *sk)
93 {
94 sk_stop_timer(sk, &nr_sk(sk)->t4timer);
95 }
96
nr_stop_idletimer(struct sock * sk)97 void nr_stop_idletimer(struct sock *sk)
98 {
99 sk_stop_timer(sk, &nr_sk(sk)->idletimer);
100 }
101
nr_stop_heartbeat(struct sock * sk)102 void nr_stop_heartbeat(struct sock *sk)
103 {
104 sk_stop_timer(sk, &sk->sk_timer);
105 }
106
nr_t1timer_running(struct sock * sk)107 int nr_t1timer_running(struct sock *sk)
108 {
109 return timer_pending(&nr_sk(sk)->t1timer);
110 }
111
nr_heartbeat_expiry(struct timer_list * t)112 static 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 if (sk->sk_state == TCP_LISTEN)
125 sock_hold(sk);
126 bh_unlock_sock(sk);
127 nr_destroy_socket(sk);
128 goto out;
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 out:
150 sock_put(sk);
151 }
152
nr_t2timer_expiry(struct timer_list * t)153 static void nr_t2timer_expiry(struct timer_list *t)
154 {
155 struct nr_sock *nr = from_timer(nr, t, t2timer);
156 struct sock *sk = &nr->sock;
157
158 bh_lock_sock(sk);
159 if (nr->condition & NR_COND_ACK_PENDING) {
160 nr->condition &= ~NR_COND_ACK_PENDING;
161 nr_enquiry_response(sk);
162 }
163 bh_unlock_sock(sk);
164 sock_put(sk);
165 }
166
nr_t4timer_expiry(struct timer_list * t)167 static void nr_t4timer_expiry(struct timer_list *t)
168 {
169 struct nr_sock *nr = from_timer(nr, t, t4timer);
170 struct sock *sk = &nr->sock;
171
172 bh_lock_sock(sk);
173 nr_sk(sk)->condition &= ~NR_COND_PEER_RX_BUSY;
174 bh_unlock_sock(sk);
175 sock_put(sk);
176 }
177
nr_idletimer_expiry(struct timer_list * t)178 static void nr_idletimer_expiry(struct timer_list *t)
179 {
180 struct nr_sock *nr = from_timer(nr, t, idletimer);
181 struct sock *sk = &nr->sock;
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 sock_put(sk);
205 }
206
nr_t1timer_expiry(struct timer_list * t)207 static void nr_t1timer_expiry(struct timer_list *t)
208 {
209 struct nr_sock *nr = from_timer(nr, t, t1timer);
210 struct sock *sk = &nr->sock;
211
212 bh_lock_sock(sk);
213 switch (nr->state) {
214 case NR_STATE_1:
215 if (nr->n2count == nr->n2) {
216 nr_disconnect(sk, ETIMEDOUT);
217 goto out;
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 goto out;
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 goto out;
238 } else {
239 nr->n2count++;
240 nr_requeue_frames(sk);
241 }
242 break;
243 }
244
245 nr_start_t1timer(sk);
246 out:
247 bh_unlock_sock(sk);
248 sock_put(sk);
249 }
250