patch-2.1.27 linux/net/ax25/ax25_iface.c

• Lines: 283
• Date: Tue Feb 25 17:12:51 1997
• Orig file: v2.1.26/linux/net/ax25/ax25_iface.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.1.26/linux/net/ax25/ax25_iface.c linux/net/ax25/ax25_iface.c
@@ -0,0 +1,282 @@
+/*
+ *	AX.25 release 036
+ *
+ *	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
+ *	AX.25 036	Jonathan(G4KLX)	Split from ax25_timer.c.
+ */
+
+#include <linux/config.h>
+#if defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE)
+#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 <net/ax25.h>
+#include <linux/inet.h>
+#include <linux/netdevice.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>
+
+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_address *, struct device *);
+} *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 = 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_address *, struct device *))
+{
+	struct linkfail_struct *linkfail;
+	unsigned long flags;
+
+	if ((linkfail = 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_address *, struct device *))
+{
+	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 = 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_address *callsign, struct device *dev)
+{
+	struct linkfail_struct *linkfail;
+
+	for (linkfail = linkfail_list; linkfail != NULL; linkfail = linkfail->next)
+		(linkfail->func)(callsign, dev);
+}
+
+/*
+ *	Return the state of an AX.25 link given source, destination, and
+ *	device.
+ */
+int ax25_link_up(ax25_address *src, ax25_address *dest, ax25_digi *digi, struct device *dev)
+{
+	return ax25_find_cb(src, dest, digi, dev) != NULL;
+}
+
+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