patch-2.0.35 linux/net/ax25/ax25_timer.c

• Lines: 547
• Date: Mon Jul 13 13:47:40 1998
• Orig file: v2.0.34/linux/net/ax25/ax25_timer.c
• Orig date: Sat Aug 10 00:03:16 1996

diff -u --recursive --new-file v2.0.34/linux/net/ax25/ax25_timer.c linux/net/ax25/ax25_timer.c
@@ -1,8 +1,5 @@
 /*
- *	AX.25 release 032
- *
- *	This is ALPHA test software. This code may break your machine, randomly fail to work with new 
- *	releases, misbehave and/or generally screw up. It might even work. 
+ *	AX.25 release 035
  *
  *	This code REQUIRES 1.2.1 or higher/ NET3.029
  *
@@ -19,10 +16,12 @@
  *	AX.25 029	Alan(GW4PTS)	Switched to KA9Q constant names.
  *	AX.25 031	Joerg(DL1BKE)	Added DAMA support
  *	AX.25 032	Joerg(DL1BKE)	Fixed DAMA timeout bug
+ *	AX.25 033	Jonathan(G4KLX)	Modularisation functions.
+ *	AX.25 035	Frederic(F1OAT)	Support for pseudo-digipeating.
  */
 
 #include <linux/config.h>
-#ifdef CONFIG_AX25
+#if defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE)
 #include <linux/errno.h>
 #include <linux/types.h>
 #include <linux/socket.h>
@@ -43,51 +42,31 @@
 #include <linux/fcntl.h>
 #include <linux/mm.h>
 #include <linux/interrupt.h>
-#ifdef CONFIG_NETROM
-#include <net/netrom.h>
-#endif
 
 static void ax25_timer(unsigned long);
 
 /*
- *	Linux set/reset timer routines
+ *	Linux set timer
  */
 void ax25_set_timer(ax25_cb *ax25)
 {
 	unsigned long flags;	
 
-	save_flags(flags);
-	cli();
-	del_timer(&ax25->timer);
-	restore_flags(flags);
-
-	ax25->timer.next     = ax25->timer.prev = NULL;	
-	ax25->timer.data     = (unsigned long)ax25;
-	ax25->timer.function = &ax25_timer;
-
-	ax25->timer.expires = jiffies + 10;
-	add_timer(&ax25->timer);
-}
-
-static void ax25_reset_timer(ax25_cb *ax25)
-{
-	unsigned long flags;
-	
-	save_flags(flags);
-	cli();
+	save_flags(flags); cli();
 	del_timer(&ax25->timer);
 	restore_flags(flags);
 
 	ax25->timer.data     = (unsigned long)ax25;
 	ax25->timer.function = &ax25_timer;
 	ax25->timer.expires  = jiffies + 10;
+
 	add_timer(&ax25->timer);
 }
 
 /*
  *	AX.25 TIMER 
  *
- *	This routine is called every 500ms. Decrement timer by this
+ *	This routine is called every 100ms. Decrement timer by this
  *	amount - if expired then process the event.
  */
 static void ax25_timer(unsigned long param)
@@ -99,7 +78,6 @@
 			/* Magic here: If we listen() and a new link dies before it
 			   is accepted() it isn't 'dead' so doesn't get removed. */
 			if (ax25->sk == NULL || ax25->sk->destroy || (ax25->sk->state == TCP_LISTEN && ax25->sk->dead)) {
-				del_timer(&ax25->timer);
 				ax25_destroy_socket(ax25);
 				return;
 			}
@@ -111,11 +89,11 @@
 			 * Check the state of the receive buffer.
 			 */
 			if (ax25->sk != NULL) {
-				if (ax25->sk->rmem_alloc < (ax25->sk->rcvbuf / 2) && (ax25->condition & OWN_RX_BUSY_CONDITION)) {
-					ax25->condition &= ~OWN_RX_BUSY_CONDITION;
+				if (ax25->sk->rmem_alloc < (ax25->sk->rcvbuf / 2) && (ax25->condition & AX25_COND_OWN_RX_BUSY)) {
+					ax25->condition &= ~AX25_COND_OWN_RX_BUSY;
+					ax25->condition &= ~AX25_COND_ACK_PENDING;
 					if (!ax25->dama_slave)
-						ax25_send_control(ax25, RR, POLLOFF, C_RESPONSE);
-					ax25->condition &= ~ACK_PENDING_CONDITION;
+						ax25_send_control(ax25, AX25_RR, AX25_POLLOFF, AX25_RESPONSE);
 					break;
 				}
 			}
@@ -132,8 +110,8 @@
 
 	if (ax25->t2timer > 0 && --ax25->t2timer == 0) {
 		if (ax25->state == AX25_STATE_3 || ax25->state == AX25_STATE_4) {
-			if (ax25->condition & ACK_PENDING_CONDITION) {
-				ax25->condition &= ~ACK_PENDING_CONDITION;
+			if (ax25->condition & AX25_COND_ACK_PENDING) {
+				ax25->condition &= ~AX25_COND_ACK_PENDING;
 				if (!ax25->dama_slave)
 					ax25_timeout_response(ax25);
 			}
@@ -144,35 +122,21 @@
 		/* dl1bke 960114: T3 expires and we are in DAMA mode:  */
 		/*                send a DISC and abort the connection */
 		if (ax25->dama_slave) {
-#ifdef CONFIG_NETROM
-			nr_link_failed(&ax25->dest_addr, ax25->device);
-#endif
-			ax25_clear_queues(ax25);
-			ax25_send_control(ax25, DISC, POLLON, C_COMMAND);
-				
-			ax25->state = AX25_STATE_0;
-			if (ax25->sk != NULL) {
-				if (ax25->sk->debug)
-					printk("T3 Timeout\n");
-				ax25->sk->state = TCP_CLOSE;
-				ax25->sk->err   = ETIMEDOUT;
-				if (!ax25->sk->dead)
-					ax25->sk->state_change(ax25->sk);
-				ax25->sk->dead  = 1;
-			}
-
-			ax25_reset_timer(ax25);
+			ax25_send_control(ax25, AX25_DISC, AX25_POLLON, AX25_COMMAND);
+			ax25_disconnect(ax25, ETIMEDOUT);
+			ax25_set_timer(ax25);
 			return;
 		}
-		
+
 		if (ax25->state == AX25_STATE_3) {
 			ax25->n2count = 0;
 			ax25_transmit_enquiry(ax25);
 			ax25->state   = AX25_STATE_4;
 		}
+
 		ax25->t3timer = ax25->t3;
 	}
-	
+
 	if (ax25->idletimer > 0 && --ax25->idletimer == 0) {
 		/* dl1bke 960228: close the connection when IDLE expires */
 		/* 		  similar to DAMA T3 timeout but with    */
@@ -183,35 +147,35 @@
 		ax25->n2count = 0;
 		if (!ax25->dama_slave) {
 			ax25->t3timer = 0;
-			ax25_send_control(ax25, DISC, POLLON, C_COMMAND);
+			ax25_send_control(ax25, AX25_DISC, AX25_POLLON, AX25_COMMAND);
 		} else {
 			ax25->t3timer = ax25->t3;
 		}
-		
+
 		/* state 1 or 2 should not happen, but... */
-		
+
 		if (ax25->state == AX25_STATE_1 || ax25->state == AX25_STATE_2)
 			ax25->state = AX25_STATE_0;
 		else
 			ax25->state = AX25_STATE_2;
 
 		ax25->t1timer = ax25->t1 = ax25_calculate_t1(ax25);
+		ax25->t2timer = 0;
 
 		if (ax25->sk != NULL) {
-			ax25->sk->state = TCP_CLOSE;
-			ax25->sk->err = 0;
+			ax25->sk->state     = TCP_CLOSE;
+			ax25->sk->err       = 0;
+			ax25->sk->shutdown |= SEND_SHUTDOWN;
 			if (!ax25->sk->dead)
 				ax25->sk->state_change(ax25->sk);
-			ax25->sk->dead = 1;
-			ax25->sk->destroy = 1;
+			ax25->sk->dead      = 1;
 		}
 	}
-		                                                                                                                                                                                                                                                                                                                                        
+
 	/* dl1bke 960114: DAMA T1 timeouts are handled in ax25_dama_slave_transmit */
 	/* 		  nevertheless we have to re-enqueue the timer struct...   */
-	
 	if (ax25->t1timer == 0 || --ax25->t1timer > 0) {
-		ax25_reset_timer(ax25);
+		ax25_set_timer(ax25);
 		return;
 	}
 
@@ -227,64 +191,40 @@
  *                within the poll of any connected channel. Remember 
  *                that we are not allowed to send anything unless we
  *                get polled by the Master.
- *                
+ *
  *                Thus we'll have to do parts of our T1 handling in
  *                ax25_enquiry_response().
  */
-void ax25_t1_timeout(ax25_cb * ax25)
+void ax25_t1_timeout(ax25_cb *ax25)
 {	
 	switch (ax25->state) {
 		case AX25_STATE_1: 
 			if (ax25->n2count == ax25->n2) {
-				if (ax25->modulus == MODULUS) {
-#ifdef CONFIG_NETROM
-					nr_link_failed(&ax25->dest_addr, ax25->device);
-#endif
-					ax25_clear_queues(ax25);
-					ax25->state = AX25_STATE_0;
-					if (ax25->sk != NULL) {
-						ax25->sk->state = TCP_CLOSE;
-						ax25->sk->err   = ETIMEDOUT;
-						if (!ax25->sk->dead)
-							ax25->sk->state_change(ax25->sk);
-						ax25->sk->dead  = 1;
-					}
+				if (ax25->modulus == AX25_MODULUS) {
+					ax25_disconnect(ax25, ETIMEDOUT);
 				} else {
-					ax25->modulus = MODULUS;
+					ax25->modulus = AX25_MODULUS;
 					ax25->window  = ax25_dev_get_value(ax25->device, AX25_VALUES_WINDOW);
 					ax25->n2count = 0;
-					ax25_send_control(ax25, SABM, ax25_dev_is_dama_slave(ax25->device)? POLLOFF : POLLON, C_COMMAND);
+					ax25_send_control(ax25, AX25_SABM, ax25_dev_is_dama_slave(ax25->device) ? AX25_POLLOFF : AX25_POLLON, AX25_COMMAND);
 				}
 			} else {
 				ax25->n2count++;
-				if (ax25->modulus == MODULUS) {
-					ax25_send_control(ax25, SABM, ax25_dev_is_dama_slave(ax25->device)? POLLOFF : POLLON, C_COMMAND);
-				} else {
-					ax25_send_control(ax25, SABME, ax25_dev_is_dama_slave(ax25->device)? POLLOFF : POLLON, C_COMMAND);
-				}
+				if (ax25->modulus == AX25_MODULUS)
+					ax25_send_control(ax25, AX25_SABM, ax25_dev_is_dama_slave(ax25->device) ? AX25_POLLOFF : AX25_POLLON, AX25_COMMAND);
+				else
+					ax25_send_control(ax25, AX25_SABME, ax25_dev_is_dama_slave(ax25->device) ? AX25_POLLOFF : AX25_POLLON, AX25_COMMAND);
 			}
 			break;
 
 		case AX25_STATE_2:
 			if (ax25->n2count == ax25->n2) {
-#ifdef CONFIG_NETROM
-				nr_link_failed(&ax25->dest_addr, ax25->device);
-#endif
-				ax25_clear_queues(ax25);
-				ax25->state = AX25_STATE_0;
-				ax25_send_control(ax25, DISC, POLLON, C_COMMAND);
-				
-				if (ax25->sk != NULL) {
-					ax25->sk->state = TCP_CLOSE;
-					ax25->sk->err   = ETIMEDOUT;
-					if (!ax25->sk->dead)
-						ax25->sk->state_change(ax25->sk);
-					ax25->sk->dead  = 1;
-				}
+				ax25_send_control(ax25, AX25_DISC, AX25_POLLON, AX25_COMMAND);
+				ax25_disconnect(ax25, ETIMEDOUT);
 			} else {
 				ax25->n2count++;
 				if (!ax25_dev_is_dama_slave(ax25->device))
-					ax25_send_control(ax25, DISC, POLLON, C_COMMAND);
+					ax25_send_control(ax25, AX25_DISC, AX25_POLLON, AX25_COMMAND);
 			}
 			break;
 
@@ -297,21 +237,8 @@
 
 		case AX25_STATE_4:
 			if (ax25->n2count == ax25->n2) {
-#ifdef CONFIG_NETROM
-				nr_link_failed(&ax25->dest_addr, ax25->device);
-#endif
-				ax25_clear_queues(ax25);
-				ax25_send_control(ax25, DM, POLLON, C_RESPONSE);
-				ax25->state = AX25_STATE_0;
-				if (ax25->sk != NULL) {
-					if (ax25->sk->debug)
-						printk("Link Failure\n");
-					ax25->sk->state = TCP_CLOSE;
-					ax25->sk->err   = ETIMEDOUT;
-					if (!ax25->sk->dead)
-						ax25->sk->state_change(ax25->sk);
-					ax25->sk->dead  = 1;
-				}
+				ax25_send_control(ax25, AX25_DM, AX25_POLLON, AX25_RESPONSE);
+				ax25_disconnect(ax25, ETIMEDOUT);
 			} else {
 				ax25->n2count++;
 				if (!ax25->dama_slave)
@@ -323,6 +250,241 @@
 	ax25->t1timer = ax25->t1 = ax25_calculate_t1(ax25);
 
 	ax25_set_timer(ax25);
+}
+
+/************************************************************************/
+/*	Module support functions follow.				*/
+/************************************************************************/
+
+static struct protocol_struct {
+	struct protocol_struct *next;
+	unsigned int pid;
+	int (*func)(struct sk_buff *, ax25_cb *);
+} *protocol_list = NULL;
+
+static struct linkfail_struct {
+	struct linkfail_struct *next;
+	void (*func)(ax25_cb *, int);
+} *linkfail_list = NULL;
+
+static struct listen_struct {
+	struct listen_struct *next;
+	ax25_address  callsign;
+	struct device *dev;
+} *listen_list = NULL;
+
+int ax25_protocol_register(unsigned int pid, int (*func)(struct sk_buff *, ax25_cb *))
+{
+	struct protocol_struct *protocol;
+	unsigned long flags;
+
+	if (pid == AX25_P_TEXT || pid == AX25_P_SEGMENT)
+		return 0;
+#ifdef CONFIG_INET
+	if (pid == AX25_P_IP || pid == AX25_P_ARP)
+		return 0;
+#endif
+	if ((protocol = (struct protocol_struct *)kmalloc(sizeof(*protocol), GFP_ATOMIC)) == NULL)
+		return 0;
+
+	protocol->pid  = pid;
+	protocol->func = func;
+
+	save_flags(flags);
+	cli();
+
+	protocol->next = protocol_list;
+	protocol_list  = protocol;
+
+	restore_flags(flags);
+
+	return 1;
+}
+
+void ax25_protocol_release(unsigned int pid)
+{
+	struct protocol_struct *s, *protocol = protocol_list;
+	unsigned long flags;
+
+	if (protocol == NULL)
+		return;
+
+	save_flags(flags);
+	cli();
+
+	if (protocol->pid == pid) {
+		protocol_list = protocol->next;
+		restore_flags(flags);
+		kfree_s(protocol, sizeof(struct protocol_struct));
+		return;
+	}
+
+	while (protocol != NULL && protocol->next != NULL) {
+		if (protocol->next->pid == pid) {
+			s = protocol->next;
+			protocol->next = protocol->next->next;
+			restore_flags(flags);
+			kfree_s(s, sizeof(struct protocol_struct));
+			return;
+		}
+
+		protocol = protocol->next;
+	}
+
+	restore_flags(flags);
+}
+
+int ax25_linkfail_register(void (*func)(ax25_cb *, int))
+{
+	struct linkfail_struct *linkfail;
+	unsigned long flags;
+
+	if ((linkfail = (struct linkfail_struct *)kmalloc(sizeof(*linkfail), GFP_ATOMIC)) == NULL)
+		return 0;
+
+	linkfail->func = func;
+
+	save_flags(flags);
+	cli();
+
+	linkfail->next = linkfail_list;
+	linkfail_list  = linkfail;
+
+	restore_flags(flags);
+
+	return 1;
+}
+
+void ax25_linkfail_release(void (*func)(ax25_cb *, int))
+{
+	struct linkfail_struct *s, *linkfail = linkfail_list;
+	unsigned long flags;
+
+	if (linkfail == NULL)
+		return;
+
+	save_flags(flags);
+	cli();
+
+	if (linkfail->func == func) {
+		linkfail_list = linkfail->next;
+		restore_flags(flags);
+		kfree_s(linkfail, sizeof(struct linkfail_struct));
+		return;
+	}
+
+	while (linkfail != NULL && linkfail->next != NULL) {
+		if (linkfail->next->func == func) {
+			s = linkfail->next;
+			linkfail->next = linkfail->next->next;
+			restore_flags(flags);
+			kfree_s(s, sizeof(struct linkfail_struct));
+			return;
+		}
+
+		linkfail = linkfail->next;
+	}
+
+	restore_flags(flags);
+}
+
+int ax25_listen_register(ax25_address *callsign, struct device *dev)
+{
+	struct listen_struct *listen;
+	unsigned long flags;
+
+	if (ax25_listen_mine(callsign, dev))
+		return 0;
+
+	if ((listen = (struct listen_struct *)kmalloc(sizeof(*listen), GFP_ATOMIC)) == NULL)
+		return 0;
+
+	listen->callsign = *callsign;
+	listen->dev      = dev;
+
+	save_flags(flags);
+	cli();
+
+	listen->next = listen_list;
+	listen_list  = listen;
+
+	restore_flags(flags);
+
+	return 1;
+}
+
+void ax25_listen_release(ax25_address *callsign, struct device *dev)
+{
+	struct listen_struct *s, *listen = listen_list;
+	unsigned long flags;
+
+	if (listen == NULL)
+		return;
+
+	save_flags(flags);
+	cli();
+
+	if (ax25cmp(&listen->callsign, callsign) == 0 && listen->dev == dev) {
+		listen_list = listen->next;
+		restore_flags(flags);
+		kfree_s(listen, sizeof(struct listen_struct));
+		return;
+	}
+
+	while (listen != NULL && listen->next != NULL) {
+		if (ax25cmp(&listen->next->callsign, callsign) == 0 && listen->next->dev == dev) {
+			s = listen->next;
+			listen->next = listen->next->next;
+			restore_flags(flags);
+			kfree_s(s, sizeof(struct listen_struct));
+			return;
+		}
+
+		listen = listen->next;
+	}
+
+	restore_flags(flags);
+}
+
+int (*ax25_protocol_function(unsigned int pid))(struct sk_buff *, ax25_cb *)
+{
+	struct protocol_struct *protocol;
+
+	for (protocol = protocol_list; protocol != NULL; protocol = protocol->next)
+		if (protocol->pid == pid)
+			return protocol->func;
+
+	return NULL;
+}
+
+int ax25_listen_mine(ax25_address *callsign, struct device *dev)
+{
+	struct listen_struct *listen;
+
+	for (listen = listen_list; listen != NULL; listen = listen->next)
+		if (ax25cmp(&listen->callsign, callsign) == 0 && (listen->dev == dev || listen->dev == NULL))
+			return 1;
+
+	return 0;
+}
+
+void ax25_link_failed(ax25_cb *ax25, int reason)
+{
+	struct linkfail_struct *linkfail;
+
+	for (linkfail = linkfail_list; linkfail != NULL; linkfail = linkfail->next)
+		(linkfail->func)(ax25, reason);
+}
+
+int ax25_protocol_is_registered(unsigned int pid)
+{
+	struct protocol_struct *protocol;
+
+	for (protocol = protocol_list; protocol != NULL; protocol = protocol->next)
+		if (protocol->pid == pid)
+			return 1;
+
+	return 0;
 }
 
 #endif