Commit | Line | Data |
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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 | 2 | /* |
1da177e4 LT |
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> | |
c752f073 | 22 | #include <net/tcp_states.h> |
1da177e4 LT |
23 | #include <linux/fcntl.h> |
24 | #include <linux/mm.h> | |
25 | #include <linux/interrupt.h> | |
26 | #include <net/rose.h> | |
27 | ||
99767f27 | 28 | static void rose_heartbeat_expiry(struct timer_list *t); |
4966babd KC |
29 | static void rose_timer_expiry(struct timer_list *); |
30 | static void rose_idletimer_expiry(struct timer_list *); | |
1da177e4 LT |
31 | |
32 | void rose_start_heartbeat(struct sock *sk) | |
33 | { | |
9cc02ede | 34 | sk_stop_timer(sk, &sk->sk_timer); |
1da177e4 | 35 | |
841b86f3 | 36 | sk->sk_timer.function = rose_heartbeat_expiry; |
1da177e4 LT |
37 | sk->sk_timer.expires = jiffies + 5 * HZ; |
38 | ||
9cc02ede | 39 | sk_reset_timer(sk, &sk->sk_timer, sk->sk_timer.expires); |
1da177e4 LT |
40 | } |
41 | ||
42 | void rose_start_t1timer(struct sock *sk) | |
43 | { | |
44 | struct rose_sock *rose = rose_sk(sk); | |
45 | ||
9cc02ede | 46 | sk_stop_timer(sk, &rose->timer); |
1da177e4 | 47 | |
841b86f3 | 48 | rose->timer.function = rose_timer_expiry; |
1da177e4 LT |
49 | rose->timer.expires = jiffies + rose->t1; |
50 | ||
9cc02ede | 51 | sk_reset_timer(sk, &rose->timer, rose->timer.expires); |
1da177e4 LT |
52 | } |
53 | ||
54 | void rose_start_t2timer(struct sock *sk) | |
55 | { | |
56 | struct rose_sock *rose = rose_sk(sk); | |
57 | ||
9cc02ede | 58 | sk_stop_timer(sk, &rose->timer); |
1da177e4 | 59 | |
841b86f3 | 60 | rose->timer.function = rose_timer_expiry; |
1da177e4 LT |
61 | rose->timer.expires = jiffies + rose->t2; |
62 | ||
9cc02ede | 63 | sk_reset_timer(sk, &rose->timer, rose->timer.expires); |
1da177e4 LT |
64 | } |
65 | ||
66 | void rose_start_t3timer(struct sock *sk) | |
67 | { | |
68 | struct rose_sock *rose = rose_sk(sk); | |
69 | ||
9cc02ede | 70 | sk_stop_timer(sk, &rose->timer); |
1da177e4 | 71 | |
841b86f3 | 72 | rose->timer.function = rose_timer_expiry; |
1da177e4 LT |
73 | rose->timer.expires = jiffies + rose->t3; |
74 | ||
9cc02ede | 75 | sk_reset_timer(sk, &rose->timer, rose->timer.expires); |
1da177e4 LT |
76 | } |
77 | ||
78 | void rose_start_hbtimer(struct sock *sk) | |
79 | { | |
80 | struct rose_sock *rose = rose_sk(sk); | |
81 | ||
9cc02ede | 82 | sk_stop_timer(sk, &rose->timer); |
1da177e4 | 83 | |
841b86f3 | 84 | rose->timer.function = rose_timer_expiry; |
1da177e4 LT |
85 | rose->timer.expires = jiffies + rose->hb; |
86 | ||
9cc02ede | 87 | sk_reset_timer(sk, &rose->timer, rose->timer.expires); |
1da177e4 LT |
88 | } |
89 | ||
90 | void rose_start_idletimer(struct sock *sk) | |
91 | { | |
92 | struct rose_sock *rose = rose_sk(sk); | |
93 | ||
9cc02ede | 94 | sk_stop_timer(sk, &rose->idletimer); |
1da177e4 LT |
95 | |
96 | if (rose->idle > 0) { | |
841b86f3 | 97 | rose->idletimer.function = rose_idletimer_expiry; |
1da177e4 LT |
98 | rose->idletimer.expires = jiffies + rose->idle; |
99 | ||
9cc02ede | 100 | sk_reset_timer(sk, &rose->idletimer, rose->idletimer.expires); |
1da177e4 LT |
101 | } |
102 | } | |
103 | ||
104 | void rose_stop_heartbeat(struct sock *sk) | |
105 | { | |
9cc02ede | 106 | sk_stop_timer(sk, &sk->sk_timer); |
1da177e4 LT |
107 | } |
108 | ||
109 | void rose_stop_timer(struct sock *sk) | |
110 | { | |
9cc02ede | 111 | sk_stop_timer(sk, &rose_sk(sk)->timer); |
1da177e4 LT |
112 | } |
113 | ||
114 | void rose_stop_idletimer(struct sock *sk) | |
115 | { | |
9cc02ede | 116 | sk_stop_timer(sk, &rose_sk(sk)->idletimer); |
1da177e4 LT |
117 | } |
118 | ||
99767f27 | 119 | static void rose_heartbeat_expiry(struct timer_list *t) |
1da177e4 | 120 | { |
99767f27 | 121 | struct sock *sk = from_timer(sk, t, sk_timer); |
1da177e4 LT |
122 | struct rose_sock *rose = rose_sk(sk); |
123 | ||
124 | bh_lock_sock(sk); | |
125 | switch (rose->state) { | |
126 | case ROSE_STATE_0: | |
127 | /* Magic here: If we listen() and a new link dies before it | |
128 | is accepted() it isn't 'dead' so doesn't get removed. */ | |
129 | if (sock_flag(sk, SOCK_DESTROY) || | |
130 | (sk->sk_state == TCP_LISTEN && sock_flag(sk, SOCK_DEAD))) { | |
a3d7a9d7 | 131 | bh_unlock_sock(sk); |
1da177e4 | 132 | rose_destroy_socket(sk); |
9cc02ede | 133 | sock_put(sk); |
1da177e4 LT |
134 | return; |
135 | } | |
136 | break; | |
137 | ||
138 | case ROSE_STATE_3: | |
139 | /* | |
140 | * Check for the state of the receive buffer. | |
141 | */ | |
142 | if (atomic_read(&sk->sk_rmem_alloc) < (sk->sk_rcvbuf / 2) && | |
143 | (rose->condition & ROSE_COND_OWN_RX_BUSY)) { | |
144 | rose->condition &= ~ROSE_COND_OWN_RX_BUSY; | |
145 | rose->condition &= ~ROSE_COND_ACK_PENDING; | |
146 | rose->vl = rose->vr; | |
147 | rose_write_internal(sk, ROSE_RR); | |
148 | rose_stop_timer(sk); /* HB */ | |
149 | break; | |
150 | } | |
151 | break; | |
152 | } | |
153 | ||
154 | rose_start_heartbeat(sk); | |
155 | bh_unlock_sock(sk); | |
9cc02ede | 156 | sock_put(sk); |
1da177e4 LT |
157 | } |
158 | ||
4966babd | 159 | static void rose_timer_expiry(struct timer_list *t) |
1da177e4 | 160 | { |
4966babd KC |
161 | struct rose_sock *rose = from_timer(rose, t, timer); |
162 | struct sock *sk = &rose->sock; | |
1da177e4 LT |
163 | |
164 | bh_lock_sock(sk); | |
165 | switch (rose->state) { | |
166 | case ROSE_STATE_1: /* T1 */ | |
167 | case ROSE_STATE_4: /* T2 */ | |
168 | rose_write_internal(sk, ROSE_CLEAR_REQUEST); | |
169 | rose->state = ROSE_STATE_2; | |
170 | rose_start_t3timer(sk); | |
171 | break; | |
172 | ||
173 | case ROSE_STATE_2: /* T3 */ | |
174 | rose->neighbour->use--; | |
175 | rose_disconnect(sk, ETIMEDOUT, -1, -1); | |
176 | break; | |
177 | ||
178 | case ROSE_STATE_3: /* HB */ | |
179 | if (rose->condition & ROSE_COND_ACK_PENDING) { | |
180 | rose->condition &= ~ROSE_COND_ACK_PENDING; | |
181 | rose_enquiry_response(sk); | |
182 | } | |
183 | break; | |
184 | } | |
185 | bh_unlock_sock(sk); | |
9cc02ede | 186 | sock_put(sk); |
1da177e4 LT |
187 | } |
188 | ||
4966babd | 189 | static void rose_idletimer_expiry(struct timer_list *t) |
1da177e4 | 190 | { |
4966babd KC |
191 | struct rose_sock *rose = from_timer(rose, t, idletimer); |
192 | struct sock *sk = &rose->sock; | |
1da177e4 LT |
193 | |
194 | bh_lock_sock(sk); | |
195 | rose_clear_queues(sk); | |
196 | ||
197 | rose_write_internal(sk, ROSE_CLEAR_REQUEST); | |
198 | rose_sk(sk)->state = ROSE_STATE_2; | |
199 | ||
200 | rose_start_t3timer(sk); | |
201 | ||
202 | sk->sk_state = TCP_CLOSE; | |
203 | sk->sk_err = 0; | |
204 | sk->sk_shutdown |= SEND_SHUTDOWN; | |
205 | ||
206 | if (!sock_flag(sk, SOCK_DEAD)) { | |
207 | sk->sk_state_change(sk); | |
208 | sock_set_flag(sk, SOCK_DEAD); | |
209 | } | |
210 | bh_unlock_sock(sk); | |
9cc02ede | 211 | sock_put(sk); |
1da177e4 | 212 | } |