patch-2.1.16 linux/net/x25/x25_route.c

• Lines: 268
• Date: Wed Dec 18 12:07:56 1996
• Orig file: v2.1.15/linux/net/x25/x25_route.c
• Orig date: Thu Jan 1 02:00:00 1970

diff -u --recursive --new-file v2.1.15/linux/net/x25/x25_route.c linux/net/x25/x25_route.c
@@ -0,0 +1,267 @@
+/*
+ *	X.25 Packet Layer 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
+ *
+ *	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
+ *	X.25 001	Jonathan Naylor	Started coding.
+ */
+ 
+#include <linux/config.h>
+#if defined(CONFIG_X25) || defined(CONFIG_X25_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 <linux/inet.h>
+#include <linux/netdevice.h>
+#include <net/arp.h>
+#include <linux/if_arp.h>
+#include <linux/skbuff.h>
+#include <net/sock.h>
+#include <asm/segment.h>
+#include <asm/system.h>
+#include <asm/uaccess.h>
+#include <linux/fcntl.h>
+#include <linux/termios.h>	/* For TIOCINQ/OUTQ */
+#include <linux/mm.h>
+#include <linux/interrupt.h>
+#include <linux/notifier.h>
+#include <linux/firewall.h>
+#include <net/x25.h>
+
+static struct x25_route *x25_route_list = NULL;
+
+/*
+ *	Add a new route.
+ */
+static int x25_add_route(x25_address *address, unsigned int sigdigits, struct device *dev)
+{
+	struct x25_route *x25_route;
+	unsigned long flags;
+
+	for (x25_route = x25_route_list; x25_route != NULL; x25_route = x25_route->next)
+		if (memcmp(&x25_route->address, address, sigdigits) == 0 && x25_route->sigdigits == sigdigits)
+			return -EINVAL;
+
+	if ((x25_route = (struct x25_route *)kmalloc(sizeof(*x25_route), GFP_ATOMIC)) == NULL)
+		return -ENOMEM;
+
+	x25_route->address   = *address;
+	x25_route->sigdigits = sigdigits;
+	x25_route->dev       = dev;
+
+	save_flags(flags); cli();
+	x25_route->next = x25_route_list;
+	x25_route_list  = x25_route;
+	restore_flags(flags);
+		
+	return 0;
+}
+
+static void x25_remove_route(struct x25_route *x25_route)
+{
+	struct x25_route *s;
+	unsigned long flags;
+	
+	save_flags(flags);
+	cli();
+
+	if ((s = x25_route_list) == x25_route) {
+		x25_route_list = x25_route->next;
+		restore_flags(flags);
+		kfree_s(x25_route, sizeof(struct x25_route));
+		return;
+	}
+
+	while (s != NULL && s->next != NULL) {
+		if (s->next == x25_route) {
+			s->next = x25_route->next;
+			restore_flags(flags);
+			kfree_s(x25_route, sizeof(struct x25_route));
+			return;
+		}
+
+		s = s->next;
+	}
+
+	restore_flags(flags);
+}
+
+static int x25_del_route(x25_address *address, unsigned int sigdigits, struct device *dev)
+{
+	struct x25_route *x25_route;
+	
+	for (x25_route = x25_route_list; x25_route != NULL; x25_route = x25_route->next) {
+		if (memcmp(&x25_route->address, address, sigdigits) == 0 && x25_route->sigdigits == sigdigits && x25_route->dev == dev) {
+			x25_remove_route(x25_route);
+			return 0;
+		}
+	}
+
+	return -EINVAL;
+}
+
+/*
+ *	A device has been removed, remove its routes.
+ */
+void x25_route_device_down(struct device *dev)
+{
+	struct x25_route *route, *x25_route = x25_route_list;
+
+	while (x25_route != NULL) {
+		route     = x25_route;
+		x25_route = x25_route->next;
+		
+		if (route->dev == dev)
+			x25_remove_route(route);
+	}
+}
+
+/*
+ *	Check that the device given is a valid X.25 interface that is "up".
+ */
+struct device *x25_dev_get(char *devname)
+{
+	struct device *dev;
+
+	if ((dev = dev_get(devname)) == NULL)
+		return NULL;
+
+	if ((dev->flags & IFF_UP) && (dev->type == ARPHRD_X25 || dev->type == ARPHRD_ETHER))
+		return dev;
+
+	return NULL;
+}
+
+/*
+ *	Find a device given an X.25 address.
+ */
+struct device *x25_get_route(x25_address *addr)
+{
+	struct x25_route *route, *use = NULL;
+	
+	for (route = x25_route_list; route != NULL; route = route->next) {
+		if (memcmp(&route->address, addr, route->sigdigits) == 0) {
+			if (use == NULL) {
+				use = route;
+			} else {
+				if (route->sigdigits > use->sigdigits)
+					use = route;
+			}
+		}
+	}
+
+	return (use != NULL) ? use->dev : NULL;
+}
+
+/*
+ *	Handle the ioctls that control the routing functions.
+ */
+int x25_route_ioctl(unsigned int cmd, void *arg)
+{
+	struct x25_route_struct x25_route;
+	struct device *dev;
+	int err;
+
+	switch (cmd) {
+
+		case SIOCADDRT:
+			if ((err = verify_area(VERIFY_READ, arg, sizeof(struct x25_route_struct))) != 0)
+				return err;
+			copy_from_user(&x25_route, arg, sizeof(struct x25_route_struct));
+			if (x25_route.sigdigits < 0 || x25_route.sigdigits > 15)
+				return -EINVAL;
+			if ((dev = x25_dev_get(x25_route.device)) == NULL)
+				return -EINVAL;
+			return x25_add_route(&x25_route.address, x25_route.sigdigits, dev);
+
+		case SIOCDELRT:
+			if ((err = verify_area(VERIFY_READ, arg, sizeof(struct x25_route_struct))) != 0)
+				return err;
+			copy_from_user(&x25_route, arg, sizeof(struct x25_route_struct));
+			if (x25_route.sigdigits < 0 || x25_route.sigdigits > 15)
+				return -EINVAL;
+			if ((dev = x25_dev_get(x25_route.device)) == NULL)
+				return -EINVAL;
+			return x25_del_route(&x25_route.address, x25_route.sigdigits, dev);
+
+		default:
+			return -EINVAL;
+	}
+
+	return 0;
+}
+
+int x25_routes_get_info(char *buffer, char **start, off_t offset, int length, int dummy)
+{
+	struct x25_route *x25_route;
+	int len     = 0;
+	off_t pos   = 0;
+	off_t begin = 0;
+
+	cli();
+
+	len += sprintf(buffer, "address         digits  device\n");
+
+	for (x25_route = x25_route_list; x25_route != NULL; x25_route = x25_route->next) {
+		len += sprintf(buffer + len, "%-15s %2d %-4s\n",
+			x25_route->address.x25_addr, x25_route->sigdigits,
+			(x25_route->dev != NULL) ? x25_route->dev->name : "???");
+
+		pos = begin + len;
+
+		if (pos < offset) {
+			len   = 0;
+			begin = pos;
+		}
+		
+		if (pos > offset + length)
+			break;
+	}
+
+	sti();
+
+	*start = buffer + (offset - begin);
+	len   -= (offset - begin);
+
+	if (len > length) len = length;
+
+	return len;
+} 
+
+#ifdef MODULE
+
+/*
+ *	Release all memory associated with X.25 routing structures.
+ */
+void x25_route_free(void)
+{
+	struct x25_route *route, *x25_route = x25_route_list;
+
+	while (x25_route != NULL) {
+		route     = x25_route;
+		x25_route = x25_route->next;
+		
+		x25_remove_route(route);
+	}
+}
+
+#endif
+
+#endif