patch-2.1.16 linux/net/x25/x25_dev.c

• Lines: 183
• Date: Wed Dec 18 12:07:56 1996
• Orig file: v2.1.15/linux/net/x25/x25_dev.c
• Orig date: Thu Jan 1 02:00:00 1970

diff -u --recursive --new-file v2.1.15/linux/net/x25/x25_dev.c linux/net/x25/x25_dev.c
@@ -0,0 +1,182 @@
+/*
+ *	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/stat.h>
+#include <linux/inet.h>
+#include <linux/netdevice.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/proc_fs.h>
+#include <linux/if_arp.h>
+#include <linux/firewall.h>
+#include <net/x25.h>
+
+static int x25_receive_data(struct sk_buff *skb, struct device *dev)
+{
+	struct x25_neigh *neigh;
+	struct sock *sk;
+	unsigned short frametype;
+	unsigned int lci;
+
+#ifdef CONFIG_FIREWALL
+	if (call_in_firewall(PF_X25, skb->dev, skb->data, NULL) != FW_ACCEPT) {
+		kfree_skb(skb, FREE_READ);
+		return 0;
+	}
+#endif
+
+	/*
+	 *	Packet received from unrecognised device, throw it away.
+	 */
+	if ((neigh = x25_get_neigh(dev)) == NULL) {
+		kfree_skb(skb, FREE_READ);
+		return 0;
+	}
+
+	frametype = skb->data[2];
+        lci = ((skb->data[0] << 8) & 0xF00) + ((skb->data[1] << 0) & 0x0FF);
+
+	/*
+	 *	LCI of zero is always for us, and its always a link control
+	 *	frame.
+	 */
+	if (lci == 0) {
+		x25_link_control(skb, neigh, frametype);
+		return 0;
+	}
+
+	/*
+	 *	Find an existing socket.
+	 */
+	if ((sk = x25_find_socket(lci)) != NULL) {
+		skb->h.raw = skb->data;
+		return x25_process_rx_frame(sk, skb);
+	}
+
+	/*
+	 *	Is is a Call Request ? if so process it.
+	 */
+	if (frametype == X25_CALL_REQUEST)
+		return x25_rx_call_request(skb, neigh, lci);
+
+	/*
+	 *	Its not a Call Request, nor is it a control frame, throw it awa
+	 */
+	x25_transmit_clear_request(neigh, lci, 0x0D);
+
+	kfree_skb(skb, FREE_READ);
+
+	return 0;
+}
+
+int x25_lapb_receive_frame(struct sk_buff *skb, struct device *dev, struct packet_type *ptype)
+{
+	skb->sk = NULL;
+	
+	switch (*skb->data) {
+		case 0x00:
+			skb_pull(skb, 1);
+			return x25_receive_data(skb, dev);
+
+		default:
+			kfree_skb(skb, FREE_READ);
+			return 0;
+	}
+}
+
+int x25_llc_receive_frame(struct sk_buff *skb, struct device *dev, struct packet_type *ptype)
+{
+	unsigned int len;
+
+	skb->sk = NULL;
+
+	memcpy(&len, skb->data, sizeof(int));
+
+	skb_pull(skb, sizeof(int));
+
+	skb_trim(skb, len);
+	
+	return x25_receive_data(skb, dev);
+}
+
+int x25_link_up(struct device *dev)
+{
+	switch (dev->type) {
+		case ARPHRD_ETHER:
+			return 1;
+		case ARPHRD_X25:
+			return 0;
+		default:
+			return 0;
+	}
+}
+
+void x25_send_frame(struct sk_buff *skb, struct device *dev)
+{
+	unsigned char *dptr;
+	unsigned int  len;
+	static char bcast_addr[6] = {0xFF,0xFF,0xFF,0xFF,0xFF,0xFF};
+
+	skb->protocol = htons(ETH_P_X25);
+	skb->priority = SOPRI_NORMAL;
+	skb->dev      = dev;
+	skb->arp      = 1;
+
+	switch (dev->type) {
+		case ARPHRD_ETHER:
+			len  = skb->len;
+			dptr = skb_push(skb, sizeof(int));
+			memcpy(dptr, &len, sizeof(int));
+			dev->hard_header(skb, dev, ETH_P_X25, bcast_addr, NULL, 0);
+			break;
+
+		case ARPHRD_X25:
+			dptr  = skb_push(skb, 1);
+			*dptr = 0x00;
+			break;
+
+		default:
+			kfree_skb(skb, FREE_WRITE);
+			return;
+	}
+
+	dev_queue_xmit(skb);
+}
+
+#endif