| /* |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * Copyright (C) Alan Cox GW4PTS (alan@lxorguk.ukuu.org.uk) |
| * Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk) |
| * Copyright (C) Joerg Reuter DL1BKE (jreuter@yaina.de) |
| * Copyright (C) Frederic Rible F1OAT (frible@teaser.fr) |
| */ |
| #include <linux/errno.h> |
| #include <linux/types.h> |
| #include <linux/socket.h> |
| #include <linux/in.h> |
| #include <linux/kernel.h> |
| #include <linux/timer.h> |
| #include <linux/string.h> |
| #include <linux/sockios.h> |
| #include <linux/net.h> |
| #include <net/ax25.h> |
| #include <linux/inet.h> |
| #include <linux/netdevice.h> |
| #include <linux/skbuff.h> |
| #include <net/sock.h> |
| #include <net/tcp_states.h> |
| #include <asm/uaccess.h> |
| #include <linux/fcntl.h> |
| #include <linux/mm.h> |
| #include <linux/interrupt.h> |
| |
| void ax25_std_heartbeat_expiry(ax25_cb *ax25) |
| { |
| struct sock *sk = ax25->sk; |
| |
| if (sk) |
| bh_lock_sock(sk); |
| |
| switch (ax25->state) { |
| case AX25_STATE_0: |
| /* Magic here: If we listen() and a new link dies before it |
| is accepted() it isn't 'dead' so doesn't get removed. */ |
| if (!sk || sock_flag(sk, SOCK_DESTROY) || |
| (sk->sk_state == TCP_LISTEN && |
| sock_flag(sk, SOCK_DEAD))) { |
| if (sk) { |
| sock_hold(sk); |
| ax25_destroy_socket(ax25); |
| bh_unlock_sock(sk); |
| sock_put(sk); |
| } else |
| ax25_destroy_socket(ax25); |
| return; |
| } |
| break; |
| |
| case AX25_STATE_3: |
| case AX25_STATE_4: |
| /* |
| * Check the state of the receive buffer. |
| */ |
| if (sk != NULL) { |
| if (atomic_read(&sk->sk_rmem_alloc) < |
| (sk->sk_rcvbuf >> 1) && |
| (ax25->condition & AX25_COND_OWN_RX_BUSY)) { |
| ax25->condition &= ~AX25_COND_OWN_RX_BUSY; |
| ax25->condition &= ~AX25_COND_ACK_PENDING; |
| ax25_send_control(ax25, AX25_RR, AX25_POLLOFF, AX25_RESPONSE); |
| break; |
| } |
| } |
| } |
| |
| if (sk) |
| bh_unlock_sock(sk); |
| |
| ax25_start_heartbeat(ax25); |
| } |
| |
| void ax25_std_t2timer_expiry(ax25_cb *ax25) |
| { |
| if (ax25->condition & AX25_COND_ACK_PENDING) { |
| ax25->condition &= ~AX25_COND_ACK_PENDING; |
| ax25_std_timeout_response(ax25); |
| } |
| } |
| |
| void ax25_std_t3timer_expiry(ax25_cb *ax25) |
| { |
| ax25->n2count = 0; |
| ax25_std_transmit_enquiry(ax25); |
| ax25->state = AX25_STATE_4; |
| } |
| |
| void ax25_std_idletimer_expiry(ax25_cb *ax25) |
| { |
| ax25_clear_queues(ax25); |
| |
| ax25->n2count = 0; |
| ax25_send_control(ax25, AX25_DISC, AX25_POLLON, AX25_COMMAND); |
| ax25->state = AX25_STATE_2; |
| |
| ax25_calculate_t1(ax25); |
| ax25_start_t1timer(ax25); |
| ax25_stop_t2timer(ax25); |
| ax25_stop_t3timer(ax25); |
| |
| if (ax25->sk != NULL) { |
| bh_lock_sock(ax25->sk); |
| ax25->sk->sk_state = TCP_CLOSE; |
| ax25->sk->sk_err = 0; |
| ax25->sk->sk_shutdown |= SEND_SHUTDOWN; |
| if (!sock_flag(ax25->sk, SOCK_DEAD)) { |
| ax25->sk->sk_state_change(ax25->sk); |
| sock_set_flag(ax25->sk, SOCK_DEAD); |
| } |
| bh_unlock_sock(ax25->sk); |
| } |
| } |
| |
| void ax25_std_t1timer_expiry(ax25_cb *ax25) |
| { |
| switch (ax25->state) { |
| case AX25_STATE_1: |
| if (ax25->n2count == ax25->n2) { |
| if (ax25->modulus == AX25_MODULUS) { |
| ax25_disconnect(ax25, ETIMEDOUT); |
| return; |
| } else { |
| ax25->modulus = AX25_MODULUS; |
| ax25->window = ax25->ax25_dev->values[AX25_VALUES_WINDOW]; |
| ax25->n2count = 0; |
| ax25_send_control(ax25, AX25_SABM, AX25_POLLON, AX25_COMMAND); |
| } |
| } else { |
| ax25->n2count++; |
| if (ax25->modulus == AX25_MODULUS) |
| ax25_send_control(ax25, AX25_SABM, AX25_POLLON, AX25_COMMAND); |
| else |
| ax25_send_control(ax25, AX25_SABME, AX25_POLLON, AX25_COMMAND); |
| } |
| break; |
| |
| case AX25_STATE_2: |
| if (ax25->n2count == ax25->n2) { |
| ax25_send_control(ax25, AX25_DISC, AX25_POLLON, AX25_COMMAND); |
| ax25_disconnect(ax25, ETIMEDOUT); |
| return; |
| } else { |
| ax25->n2count++; |
| ax25_send_control(ax25, AX25_DISC, AX25_POLLON, AX25_COMMAND); |
| } |
| break; |
| |
| case AX25_STATE_3: |
| ax25->n2count = 1; |
| ax25_std_transmit_enquiry(ax25); |
| ax25->state = AX25_STATE_4; |
| break; |
| |
| case AX25_STATE_4: |
| if (ax25->n2count == ax25->n2) { |
| ax25_send_control(ax25, AX25_DM, AX25_POLLON, AX25_RESPONSE); |
| ax25_disconnect(ax25, ETIMEDOUT); |
| return; |
| } else { |
| ax25->n2count++; |
| ax25_std_transmit_enquiry(ax25); |
| } |
| break; |
| } |
| |
| ax25_calculate_t1(ax25); |
| ax25_start_t1timer(ax25); |
| } |