patch-2.1.20 linux/net/lapb/lapb_iface.c

• Lines: 410
• Date: Thu Jan 2 15:13:29 1997
• Orig file: v2.1.19/linux/net/lapb/lapb_iface.c
• Orig date: Thu Jan 1 02:00:00 1970

diff -u --recursive --new-file v2.1.19/linux/net/lapb/lapb_iface.c linux/net/lapb/lapb_iface.c
@@ -0,0 +1,409 @@
+/*
+ *	LAPB release 001
+ *
+ *	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. 
+ *
+ *	This code REQUIRES 2.1.15 or higher/ NET3.038
+ *
+ *	This module:
+ *		This module 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.
+ *
+ *	History
+ *	LAPB 001	Jonathan Naylor	Started Coding
+ */
+ 
+#include <linux/config.h>
+#if defined(CONFIG_LAPB) || defined(CONFIG_LAPB_MODULE)
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/socket.h>
+#include <linux/in.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/timer.h>
+#include <linux/string.h>
+#include <linux/sockios.h>
+#include <linux/net.h>
+#include <linux/inet.h>
+#include <linux/if_arp.h>
+#include <linux/skbuff.h>
+#include <net/sock.h>
+#include <asm/uaccess.h>
+#include <asm/system.h>
+#include <linux/fcntl.h>
+#include <linux/mm.h>
+#include <linux/interrupt.h>
+#include <linux/stat.h>
+#include <net/lapb.h>
+
+static lapb_cb *volatile lapb_list = NULL;
+
+/*
+ *	Free an allocated lapb control block. This is done to centralise
+ *	the MOD count code.
+ */
+static void lapb_free_cb(lapb_cb *lapb)
+{
+	del_timer(&lapb->timer);
+
+	kfree_s(lapb, sizeof(lapb_cb));
+
+	MOD_DEC_USE_COUNT;
+}
+
+/*
+ *	Socket removal during an interrupt is now safe.
+ */
+static void lapb_remove_cb(lapb_cb *lapb)
+{
+	lapb_cb *s;
+	unsigned long flags;
+	
+	save_flags(flags);
+	cli();
+
+	if ((s = lapb_list) == lapb) {
+		lapb_list = s->next;
+		restore_flags(flags);
+		return;
+	}
+
+	while (s != NULL && s->next != NULL) {
+		if (s->next == lapb) {
+			s->next = lapb->next;
+			restore_flags(flags);
+			return;
+		}
+
+		s = s->next;
+	}
+
+	restore_flags(flags);
+}
+
+/*
+ *	Add a socket to the bound sockets list.
+ */
+static void lapb_insert_cb(lapb_cb *lapb)
+{
+	unsigned long flags;
+
+	save_flags(flags);
+	cli();
+
+	lapb->next = lapb_list;
+	lapb_list  = lapb;
+
+	restore_flags(flags);
+}
+
+/*
+ *	Convert the integer token used by the device driver into a pointer
+ *	to a LAPB control structure.
+ */
+lapb_cb *lapb_tokentostruct(void *token)
+{
+	lapb_cb *lapb;
+
+	for (lapb = lapb_list; lapb != NULL; lapb = lapb->next)
+		if (lapb->token == token)
+			return lapb;
+
+	return NULL;
+}
+
+/*
+ *	Create an empty LAPB control block.
+ */
+static lapb_cb *lapb_create_cb(void)
+{
+	lapb_cb *lapb;
+
+	if ((lapb = (lapb_cb *)kmalloc(sizeof(*lapb), GFP_ATOMIC)) == NULL)
+		return NULL;
+
+	MOD_INC_USE_COUNT;
+
+	memset(lapb, 0x00, sizeof(*lapb));
+
+	skb_queue_head_init(&lapb->write_queue);
+	skb_queue_head_init(&lapb->ack_queue);
+
+	init_timer(&lapb->timer);
+
+	lapb->t1      = LAPB_DEFAULT_T1;
+	lapb->t2      = LAPB_DEFAULT_T2;
+	lapb->n2      = LAPB_DEFAULT_N2;
+	lapb->mode    = LAPB_DEFAULT_MODE;
+	lapb->window  = LAPB_DEFAULT_WINDOW;
+	lapb->state   = LAPB_STATE_0;
+
+	return lapb;
+}
+
+int lapb_register(void *token, struct lapb_register_struct *callbacks)
+{
+	lapb_cb *lapb;
+
+	if (lapb_tokentostruct(token) != NULL)
+		return LAPB_BADTOKEN;
+	
+	if ((lapb = lapb_create_cb()) == NULL)
+		return LAPB_NOMEM;
+
+	lapb->token     = token;
+	lapb->callbacks = *callbacks;
+
+	lapb_insert_cb(lapb);
+		
+	return LAPB_OK;
+}
+
+int lapb_unregister(void *token)
+{
+	lapb_cb *lapb;
+
+	if ((lapb = lapb_tokentostruct(token)) == NULL)
+		return LAPB_BADTOKEN;
+
+	lapb_clear_queues(lapb);
+
+	lapb_remove_cb(lapb);
+
+	lapb_free_cb(lapb);
+		
+	return LAPB_OK;
+}
+
+int lapb_getparms(void *token, struct lapb_parms_struct *parms)
+{
+	lapb_cb *lapb;
+
+	if ((lapb = lapb_tokentostruct(token)) == NULL)
+		return LAPB_BADTOKEN;
+
+	parms->t1      = lapb->t1;
+	parms->t1timer = lapb->t1timer;
+	parms->t2      = lapb->t2;
+	parms->t2timer = lapb->t2timer;
+	parms->n2      = lapb->n2;
+	parms->n2count = lapb->n2count;
+	parms->state   = lapb->state;
+	parms->window  = lapb->window;
+	parms->mode    = lapb->mode;
+
+	return LAPB_OK;
+}
+
+int lapb_setparms(void *token, struct lapb_parms_struct *parms)
+{
+	lapb_cb *lapb;
+
+	if ((lapb = lapb_tokentostruct(token)) == NULL)
+		return LAPB_BADTOKEN;
+
+	if (parms->t1 < 1)
+		return LAPB_INVALUE;
+
+	if (parms->t2 < 1)
+		return LAPB_INVALUE;
+
+	if (parms->n2 < 1)
+		return LAPB_INVALUE;
+
+	if (lapb->state == LAPB_STATE_0) {
+		if (parms->mode & LAPB_EXTENDED) {
+			if (parms->window < 1 || parms->window > 127)
+				return LAPB_INVALUE;
+		} else {
+			if (parms->window < 1 || parms->window > 7)
+				return LAPB_INVALUE;
+		}
+	
+		lapb->mode   = parms->mode;
+		lapb->window = parms->window;
+
+		if (lapb->mode & LAPB_DCE) {
+			lapb_set_timer(lapb);
+		} else {
+			lapb->t1timer = 0;
+		}
+	}
+
+	lapb->t1    = parms->t1;
+	lapb->t2    = parms->t2;
+	lapb->n2    = parms->n2;
+
+	return LAPB_OK;
+}
+
+int lapb_connect_request(void *token)
+{
+	lapb_cb *lapb;
+
+	if ((lapb = lapb_tokentostruct(token)) == NULL)
+		return LAPB_BADTOKEN;
+
+	switch (lapb->state) {
+		case LAPB_STATE_1:
+			return LAPB_OK;
+		case LAPB_STATE_3:
+		case LAPB_STATE_4:
+			return LAPB_CONNECTED;
+	}
+
+	lapb_establish_data_link(lapb);
+
+#if LAPB_DEBUG > 0
+	printk(KERN_DEBUG "lapb: (%p) S0 -> S1\n", lapb->token);
+#endif
+
+	lapb->state = LAPB_STATE_1;
+
+	lapb_set_timer(lapb);
+
+	return LAPB_OK;
+}
+	
+int lapb_disconnect_request(void *token)
+{
+	lapb_cb *lapb;
+
+	if ((lapb = lapb_tokentostruct(token)) == NULL)
+		return LAPB_BADTOKEN;
+
+	switch (lapb->state) {
+		case LAPB_STATE_0:
+			return LAPB_NOTCONNECTED;
+
+		case LAPB_STATE_1:
+#if LAPB_DEBUG > 1
+			printk(KERN_DEBUG "lapb: (%p) S1 TX DISC(1)\n", lapb->token);
+#endif
+#if LAPB_DEBUG > 0
+			printk(KERN_DEBUG "lapb: (%p) S1 -> S0\n", lapb->token);
+#endif
+			lapb_send_control(lapb, LAPB_DISC, LAPB_POLLON, LAPB_COMMAND);
+			lapb->state   = LAPB_STATE_0;
+			lapb->t1timer = (lapb->mode & LAPB_DCE) ? lapb->t1 : 0;
+			return LAPB_NOTCONNECTED;
+
+		case LAPB_STATE_2:
+			return LAPB_OK;
+	}
+
+	lapb_clear_queues(lapb);
+	lapb->n2count = 0;
+	lapb_send_control(lapb, LAPB_DISC, LAPB_POLLON, LAPB_COMMAND);
+	lapb->t1timer = lapb->t1;
+	lapb->t2timer = 0;
+	lapb->state   = LAPB_STATE_2;
+
+#if LAPB_DEBUG > 1
+	printk(KERN_DEBUG "lapb: (%p) S3 DISC(1)\n", lapb->token);
+#endif
+#if LAPB_DEBUG > 0
+	printk(KERN_DEBUG "lapb: (%p) S3 -> S2\n", lapb->token);
+#endif
+
+	return LAPB_OK;
+}
+
+int lapb_data_request(void *token, struct sk_buff *skb)
+{
+	lapb_cb *lapb;
+
+	if ((lapb = lapb_tokentostruct(token)) == NULL)
+		return LAPB_BADTOKEN;
+
+	if (lapb->state != LAPB_STATE_3 && lapb->state != LAPB_STATE_4)
+		return LAPB_NOTCONNECTED;
+
+	skb_queue_tail(&lapb->write_queue, skb);
+
+	lapb_kick(lapb);
+
+	return LAPB_OK;
+}
+
+void lapb_connect_confirmation(lapb_cb *lapb, int reason)
+{
+	if (lapb->callbacks.connect_confirmation != NULL)
+		(lapb->callbacks.connect_confirmation)(lapb->token, reason);
+}
+
+void lapb_connect_indication(lapb_cb *lapb, int reason)
+{
+	if (lapb->callbacks.connect_indication != NULL)
+		(lapb->callbacks.connect_indication)(lapb->token, reason);
+}
+
+void lapb_disconnect_confirmation(lapb_cb *lapb, int reason)
+{
+	if (lapb->callbacks.disconnect_confirmation != NULL)
+		(lapb->callbacks.disconnect_confirmation)(lapb->token, reason);
+}
+
+void lapb_disconnect_indication(lapb_cb *lapb, int reason)
+{
+	if (lapb->callbacks.disconnect_indication != NULL)
+		(lapb->callbacks.disconnect_indication)(lapb->token, reason);
+}
+
+int lapb_data_indication(lapb_cb *lapb, struct sk_buff *skb)
+{
+	int used = 0;
+
+	if (lapb->callbacks.data_indication != NULL) {
+		(lapb->callbacks.data_indication)(lapb->token, skb);
+		used = 1;
+	}
+
+	return used;
+}
+
+int lapb_data_transmit(lapb_cb *lapb, struct sk_buff *skb)
+{
+	int used = 0;
+
+	if (lapb->callbacks.data_transmit != NULL) {
+		(lapb->callbacks.data_transmit)(lapb->token, skb);
+		used = 1;
+	}
+
+	return used;
+}
+
+EXPORT_SYMBOL(lapb_register);
+EXPORT_SYMBOL(lapb_unregister);
+EXPORT_SYMBOL(lapb_getparms);
+EXPORT_SYMBOL(lapb_setparms);
+EXPORT_SYMBOL(lapb_connect_request);
+EXPORT_SYMBOL(lapb_disconnect_request);
+EXPORT_SYMBOL(lapb_data_request);
+EXPORT_SYMBOL(lapb_data_received);
+
+void lapb_proto_init(struct net_proto *pro)
+{
+	printk(KERN_INFO "LAPB for Linux. Version 0.01 for Linux NET3.038 (Linux 2.1)\n");
+}
+
+#ifdef MODULE
+int init_module(void)
+{
+	lapb_proto_init(NULL);
+
+	return 0;
+}
+
+void cleanup_module(void)
+{
+}
+#endif
+
+#endif