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v3.15
  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) Alan Cox GW4PTS (alan@lxorguk.ukuu.org.uk)
  8 * Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
  9 * Copyright (C) Joerg Reuter DL1BKE (jreuter@yaina.de)
 10 * Copyright (C) Frederic Rible F1OAT (frible@teaser.fr)
 11 */
 12#include <linux/errno.h>
 13#include <linux/types.h>
 14#include <linux/socket.h>
 15#include <linux/in.h>
 16#include <linux/kernel.h>
 17#include <linux/timer.h>
 18#include <linux/string.h>
 19#include <linux/sockios.h>
 20#include <linux/net.h>
 21#include <net/ax25.h>
 22#include <linux/inet.h>
 23#include <linux/netdevice.h>
 24#include <linux/skbuff.h>
 25#include <net/sock.h>
 26#include <net/tcp_states.h>
 27#include <asm/uaccess.h>
 28#include <linux/fcntl.h>
 29#include <linux/mm.h>
 30#include <linux/interrupt.h>
 31
 32void ax25_std_heartbeat_expiry(ax25_cb *ax25)
 33{
 34	struct sock *sk = ax25->sk;
 35
 36	if (sk)
 37		bh_lock_sock(sk);
 38
 39	switch (ax25->state) {
 40	case AX25_STATE_0:
 
 41		/* Magic here: If we listen() and a new link dies before it
 42		   is accepted() it isn't 'dead' so doesn't get removed. */
 43		if (!sk || sock_flag(sk, SOCK_DESTROY) ||
 44		    (sk->sk_state == TCP_LISTEN &&
 45		     sock_flag(sk, SOCK_DEAD))) {
 46			if (sk) {
 47				sock_hold(sk);
 48				ax25_destroy_socket(ax25);
 49				bh_unlock_sock(sk);
 
 50				sock_put(sk);
 51			} else
 52				ax25_destroy_socket(ax25);
 53			return;
 54		}
 55		break;
 56
 57	case AX25_STATE_3:
 58	case AX25_STATE_4:
 59		/*
 60		 * Check the state of the receive buffer.
 61		 */
 62		if (sk != NULL) {
 63			if (atomic_read(&sk->sk_rmem_alloc) <
 64			    (sk->sk_rcvbuf >> 1) &&
 65			    (ax25->condition & AX25_COND_OWN_RX_BUSY)) {
 66				ax25->condition &= ~AX25_COND_OWN_RX_BUSY;
 67				ax25->condition &= ~AX25_COND_ACK_PENDING;
 68				ax25_send_control(ax25, AX25_RR, AX25_POLLOFF, AX25_RESPONSE);
 69				break;
 70			}
 71		}
 72	}
 73
 74	if (sk)
 75		bh_unlock_sock(sk);
 76
 77	ax25_start_heartbeat(ax25);
 78}
 79
 80void ax25_std_t2timer_expiry(ax25_cb *ax25)
 81{
 82	if (ax25->condition & AX25_COND_ACK_PENDING) {
 83		ax25->condition &= ~AX25_COND_ACK_PENDING;
 84		ax25_std_timeout_response(ax25);
 85	}
 86}
 87
 88void ax25_std_t3timer_expiry(ax25_cb *ax25)
 89{
 90	ax25->n2count = 0;
 91	ax25_std_transmit_enquiry(ax25);
 92	ax25->state   = AX25_STATE_4;
 93}
 94
 95void ax25_std_idletimer_expiry(ax25_cb *ax25)
 96{
 97	ax25_clear_queues(ax25);
 98
 99	ax25->n2count = 0;
100	ax25_send_control(ax25, AX25_DISC, AX25_POLLON, AX25_COMMAND);
101	ax25->state   = AX25_STATE_2;
102
103	ax25_calculate_t1(ax25);
104	ax25_start_t1timer(ax25);
105	ax25_stop_t2timer(ax25);
106	ax25_stop_t3timer(ax25);
107
108	if (ax25->sk != NULL) {
109		bh_lock_sock(ax25->sk);
110		ax25->sk->sk_state     = TCP_CLOSE;
111		ax25->sk->sk_err       = 0;
112		ax25->sk->sk_shutdown |= SEND_SHUTDOWN;
113		if (!sock_flag(ax25->sk, SOCK_DEAD)) {
114			ax25->sk->sk_state_change(ax25->sk);
115			sock_set_flag(ax25->sk, SOCK_DEAD);
116		}
117		bh_unlock_sock(ax25->sk);
118	}
119}
120
121void ax25_std_t1timer_expiry(ax25_cb *ax25)
122{
123	switch (ax25->state) {
124	case AX25_STATE_1:
125		if (ax25->n2count == ax25->n2) {
126			if (ax25->modulus == AX25_MODULUS) {
127				ax25_disconnect(ax25, ETIMEDOUT);
128				return;
129			} else {
130				ax25->modulus = AX25_MODULUS;
131				ax25->window  = ax25->ax25_dev->values[AX25_VALUES_WINDOW];
132				ax25->n2count = 0;
133				ax25_send_control(ax25, AX25_SABM, AX25_POLLON, AX25_COMMAND);
134			}
135		} else {
136			ax25->n2count++;
137			if (ax25->modulus == AX25_MODULUS)
138				ax25_send_control(ax25, AX25_SABM, AX25_POLLON, AX25_COMMAND);
139			else
140				ax25_send_control(ax25, AX25_SABME, AX25_POLLON, AX25_COMMAND);
141		}
142		break;
143
144	case AX25_STATE_2:
145		if (ax25->n2count == ax25->n2) {
146			ax25_send_control(ax25, AX25_DISC, AX25_POLLON, AX25_COMMAND);
147			ax25_disconnect(ax25, ETIMEDOUT);
 
148			return;
149		} else {
150			ax25->n2count++;
151			ax25_send_control(ax25, AX25_DISC, AX25_POLLON, AX25_COMMAND);
152		}
153		break;
154
155	case AX25_STATE_3:
156		ax25->n2count = 1;
157		ax25_std_transmit_enquiry(ax25);
158		ax25->state   = AX25_STATE_4;
159		break;
160
161	case AX25_STATE_4:
162		if (ax25->n2count == ax25->n2) {
163			ax25_send_control(ax25, AX25_DM, AX25_POLLON, AX25_RESPONSE);
164			ax25_disconnect(ax25, ETIMEDOUT);
165			return;
166		} else {
167			ax25->n2count++;
168			ax25_std_transmit_enquiry(ax25);
169		}
170		break;
171	}
172
173	ax25_calculate_t1(ax25);
174	ax25_start_t1timer(ax25);
175}
v4.17
  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) Alan Cox GW4PTS (alan@lxorguk.ukuu.org.uk)
  8 * Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
  9 * Copyright (C) Joerg Reuter DL1BKE (jreuter@yaina.de)
 10 * Copyright (C) Frederic Rible F1OAT (frible@teaser.fr)
 11 */
 12#include <linux/errno.h>
 13#include <linux/types.h>
 14#include <linux/socket.h>
 15#include <linux/in.h>
 16#include <linux/kernel.h>
 17#include <linux/timer.h>
 18#include <linux/string.h>
 19#include <linux/sockios.h>
 20#include <linux/net.h>
 21#include <net/ax25.h>
 22#include <linux/inet.h>
 23#include <linux/netdevice.h>
 24#include <linux/skbuff.h>
 25#include <net/sock.h>
 26#include <net/tcp_states.h>
 27#include <linux/uaccess.h>
 28#include <linux/fcntl.h>
 29#include <linux/mm.h>
 30#include <linux/interrupt.h>
 31
 32void ax25_std_heartbeat_expiry(ax25_cb *ax25)
 33{
 34	struct sock *sk = ax25->sk;
 35
 36	if (sk)
 37		bh_lock_sock(sk);
 38
 39	switch (ax25->state) {
 40	case AX25_STATE_0:
 41	case AX25_STATE_2:
 42		/* Magic here: If we listen() and a new link dies before it
 43		   is accepted() it isn't 'dead' so doesn't get removed. */
 44		if (!sk || sock_flag(sk, SOCK_DESTROY) ||
 45		    (sk->sk_state == TCP_LISTEN &&
 46		     sock_flag(sk, SOCK_DEAD))) {
 47			if (sk) {
 48				sock_hold(sk);
 49				ax25_destroy_socket(ax25);
 50				bh_unlock_sock(sk);
 51				/* Ungrab socket and destroy it */
 52				sock_put(sk);
 53			} else
 54				ax25_destroy_socket(ax25);
 55			return;
 56		}
 57		break;
 58
 59	case AX25_STATE_3:
 60	case AX25_STATE_4:
 61		/*
 62		 * Check the state of the receive buffer.
 63		 */
 64		if (sk != NULL) {
 65			if (atomic_read(&sk->sk_rmem_alloc) <
 66			    (sk->sk_rcvbuf >> 1) &&
 67			    (ax25->condition & AX25_COND_OWN_RX_BUSY)) {
 68				ax25->condition &= ~AX25_COND_OWN_RX_BUSY;
 69				ax25->condition &= ~AX25_COND_ACK_PENDING;
 70				ax25_send_control(ax25, AX25_RR, AX25_POLLOFF, AX25_RESPONSE);
 71				break;
 72			}
 73		}
 74	}
 75
 76	if (sk)
 77		bh_unlock_sock(sk);
 78
 79	ax25_start_heartbeat(ax25);
 80}
 81
 82void ax25_std_t2timer_expiry(ax25_cb *ax25)
 83{
 84	if (ax25->condition & AX25_COND_ACK_PENDING) {
 85		ax25->condition &= ~AX25_COND_ACK_PENDING;
 86		ax25_std_timeout_response(ax25);
 87	}
 88}
 89
 90void ax25_std_t3timer_expiry(ax25_cb *ax25)
 91{
 92	ax25->n2count = 0;
 93	ax25_std_transmit_enquiry(ax25);
 94	ax25->state   = AX25_STATE_4;
 95}
 96
 97void ax25_std_idletimer_expiry(ax25_cb *ax25)
 98{
 99	ax25_clear_queues(ax25);
100
101	ax25->n2count = 0;
102	ax25_send_control(ax25, AX25_DISC, AX25_POLLON, AX25_COMMAND);
103	ax25->state   = AX25_STATE_2;
104
105	ax25_calculate_t1(ax25);
106	ax25_start_t1timer(ax25);
107	ax25_stop_t2timer(ax25);
108	ax25_stop_t3timer(ax25);
109
110	if (ax25->sk != NULL) {
111		bh_lock_sock(ax25->sk);
112		ax25->sk->sk_state     = TCP_CLOSE;
113		ax25->sk->sk_err       = 0;
114		ax25->sk->sk_shutdown |= SEND_SHUTDOWN;
115		if (!sock_flag(ax25->sk, SOCK_DEAD)) {
116			ax25->sk->sk_state_change(ax25->sk);
117			sock_set_flag(ax25->sk, SOCK_DEAD);
118		}
119		bh_unlock_sock(ax25->sk);
120	}
121}
122
123void ax25_std_t1timer_expiry(ax25_cb *ax25)
124{
125	switch (ax25->state) {
126	case AX25_STATE_1:
127		if (ax25->n2count == ax25->n2) {
128			if (ax25->modulus == AX25_MODULUS) {
129				ax25_disconnect(ax25, ETIMEDOUT);
130				return;
131			} else {
132				ax25->modulus = AX25_MODULUS;
133				ax25->window  = ax25->ax25_dev->values[AX25_VALUES_WINDOW];
134				ax25->n2count = 0;
135				ax25_send_control(ax25, AX25_SABM, AX25_POLLON, AX25_COMMAND);
136			}
137		} else {
138			ax25->n2count++;
139			if (ax25->modulus == AX25_MODULUS)
140				ax25_send_control(ax25, AX25_SABM, AX25_POLLON, AX25_COMMAND);
141			else
142				ax25_send_control(ax25, AX25_SABME, AX25_POLLON, AX25_COMMAND);
143		}
144		break;
145
146	case AX25_STATE_2:
147		if (ax25->n2count == ax25->n2) {
148			ax25_send_control(ax25, AX25_DISC, AX25_POLLON, AX25_COMMAND);
149			if (!sock_flag(ax25->sk, SOCK_DESTROY))
150				ax25_disconnect(ax25, ETIMEDOUT);
151			return;
152		} else {
153			ax25->n2count++;
154			ax25_send_control(ax25, AX25_DISC, AX25_POLLON, AX25_COMMAND);
155		}
156		break;
157
158	case AX25_STATE_3:
159		ax25->n2count = 1;
160		ax25_std_transmit_enquiry(ax25);
161		ax25->state   = AX25_STATE_4;
162		break;
163
164	case AX25_STATE_4:
165		if (ax25->n2count == ax25->n2) {
166			ax25_send_control(ax25, AX25_DM, AX25_POLLON, AX25_RESPONSE);
167			ax25_disconnect(ax25, ETIMEDOUT);
168			return;
169		} else {
170			ax25->n2count++;
171			ax25_std_transmit_enquiry(ax25);
172		}
173		break;
174	}
175
176	ax25_calculate_t1(ax25);
177	ax25_start_t1timer(ax25);
178}