patch-2.1.27 linux/net/ax25/ax25_ip.c

• Lines: 174
• Date: Tue Feb 25 17:12:51 1997
• Orig file: v2.1.26/linux/net/ax25/ax25_ip.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.1.26/linux/net/ax25/ax25_ip.c linux/net/ax25/ax25_ip.c
@@ -0,0 +1,173 @@
+/*
+ *	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 af_ax25.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/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/termios.h>	/* For TIOCINQ/OUTQ */
+#include <linux/mm.h>
+#include <linux/interrupt.h>
+#include <linux/notifier.h>
+#include <linux/proc_fs.h>
+#include <linux/stat.h>
+#include <linux/firewall.h>
+#include <linux/sysctl.h>
+#include <net/ip.h>
+#include <net/arp.h>
+
+/*
+ *	IP over AX.25 encapsulation.
+ */
+
+/*
+ *	Shove an AX.25 UI header on an IP packet and handle ARP
+ */
+
+#ifdef CONFIG_INET
+
+int ax25_encapsulate(struct sk_buff *skb, struct device *dev, unsigned short type, void *daddr, void *saddr, unsigned len)
+{
+  	/* header is an AX.25 UI frame from us to them */
+ 	unsigned char *buff = skb_push(skb, AX25_HEADER_LEN);
+
+  	*buff++ = 0x00;	/* KISS DATA */
+
+	if (daddr != NULL)
+		memcpy(buff, daddr, dev->addr_len);	/* Address specified */
+
+  	buff[6] &= ~AX25_CBIT;
+  	buff[6] &= ~AX25_EBIT;
+  	buff[6] |= AX25_SSSID_SPARE;
+  	buff    += AX25_ADDR_LEN;
+
+  	if (saddr != NULL)
+  		memcpy(buff, saddr, dev->addr_len);
+  	else
+  		memcpy(buff, dev->dev_addr, dev->addr_len);
+
+  	buff[6] &= ~AX25_CBIT;
+  	buff[6] |= AX25_EBIT;
+  	buff[6] |= AX25_SSSID_SPARE;
+  	buff    += AX25_ADDR_LEN;
+
+  	*buff++  = AX25_UI;	/* UI */
+
+  	/* Append a suitable AX.25 PID */
+  	switch (type) {
+  		case ETH_P_IP:
+  			*buff++ = AX25_P_IP;
+ 			break;
+  		case ETH_P_ARP:
+  			*buff++ = AX25_P_ARP;
+  			break;
+  		default:
+  			printk(KERN_ERR "AX.25 wrong protocol type 0x%x2.2\n", type);
+  			*buff++ = 0;
+  			break;
+ 	}
+
+	if (daddr != NULL)
+	  	return AX25_HEADER_LEN;
+
+	return -AX25_HEADER_LEN;	/* Unfinished header */
+}
+
+int ax25_rebuild_header(struct sk_buff *skb)
+{
+	struct sk_buff *ourskb;
+	int mode;
+	unsigned char *bp  = skb->data;
+	struct device *dev = skb->dev;
+	ax25_dev *ax25_dev;
+
+  	if (arp_find(bp + 1, skb))
+  		return 1;
+
+	if ((ax25_dev = ax25_dev_ax25dev(dev)) == NULL)
+		return 1;
+
+	if (bp[16] == AX25_P_IP) {
+		mode = ax25_ip_mode_get((ax25_address *)(bp + 1), dev);
+		if (mode == 'V' || (mode == ' ' && ax25_dev->values[AX25_VALUES_IPDEFMODE])) {
+			/*
+			 *	We clone the buffer and release the original thereby
+			 *	keeping it straight
+			 *
+			 *	Note: we report 1 back so the caller will
+			 *	not feed the frame direct to the physical device
+			 *	We don't want that to happen. (It won't be upset
+			 *	as we have pulled the frame from the queue by
+			 *	freeing it).
+			 */
+			if ((ourskb = skb_clone(skb, GFP_ATOMIC)) == NULL) {
+				dev_kfree_skb(skb, FREE_WRITE);
+				return 1;
+			}
+
+			if (skb->sk != NULL)
+				skb_set_owner_w(ourskb, skb->sk);
+
+			kfree_skb(skb, FREE_WRITE);
+
+			skb_pull(ourskb, AX25_HEADER_LEN - 1);	/* Keep PID */
+
+			ax25_send_frame(ourskb, ax25_dev->values[AX25_VALUES_PACLEN], (ax25_address *)(bp + 8), (ax25_address *)(bp + 1), NULL, dev);
+
+			return 1;
+		}
+	}
+
+  	bp[7]  &= ~AX25_CBIT;
+  	bp[7]  &= ~AX25_EBIT;
+  	bp[7]  |= AX25_SSSID_SPARE;
+
+  	bp[14] &= ~AX25_CBIT;
+  	bp[14] |= AX25_EBIT;
+  	bp[14] |= AX25_SSSID_SPARE;
+
+	ax25_dg_build_path(skb, (ax25_address *)(bp + 1), dev);
+
+	skb->dev      = dev;
+	skb->priority = SOPRI_NORMAL;
+
+	ax25_queue_xmit(skb);
+
+  	return 1;
+}
+
+#endif
+
+#endif