patch-2.0.35 linux/net/rose/rose_dev.c

• Lines: 239
• Date: Mon Jul 13 13:47:41 1998
• Orig file: v2.0.34/linux/net/rose/rose_dev.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.0.34/linux/net/rose/rose_dev.c linux/net/rose/rose_dev.c
@@ -0,0 +1,238 @@
+/*
+ *	ROSE release 003
+ *
+ *	This code REQUIRES 2.1.0 or higher/ NET3.029
+ *
+ *	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
+ *	ROSE 001	Jonathan(G4KLX)	Cloned from nr_dev.c.
+ */
+
+#include <linux/config.h>
+#if defined(CONFIG_ROSE) || defined(CONFIG_ROSE_MODULE)
+#include <linux/proc_fs.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/interrupt.h>
+#include <linux/fs.h>
+#include <linux/types.h>
+#include <linux/string.h>
+#include <linux/socket.h>
+#include <linux/errno.h>
+#include <linux/fcntl.h>
+#include <linux/in.h>
+#include <linux/if_ether.h>	/* For the statistics structure. */
+
+#include <asm/system.h>
+#include <asm/segment.h>
+#include <asm/io.h>
+
+#include <linux/inet.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/if_arp.h>
+#include <linux/skbuff.h>
+
+#include <net/ip.h>
+#include <net/arp.h>
+
+#include <net/ax25.h>
+#include <net/rose.h>
+
+/*
+ *	Only allow IP over ROSE frames through if the netrom device is up.
+ */
+
+int rose_rx_ip(struct sk_buff *skb, struct device *dev)
+{
+	struct enet_statistics *stats = (struct enet_statistics *)dev->priv;
+
+	if (!dev->start) {
+		stats->rx_errors++;
+		return 0;
+	}
+
+	stats->rx_packets++;
+	skb->protocol = htons(ETH_P_IP);
+
+	/* Spoof incoming device */
+	skb->dev = dev;
+
+	skb->h.raw = skb->data;
+	ip_rcv(skb, skb->dev, NULL);
+
+	return 1;
+}
+
+static int rose_header(struct sk_buff *skb, struct device *dev, unsigned short type,
+	void *daddr, void *saddr, unsigned len)
+{
+	unsigned char *buff = skb_push(skb, ROSE_MIN_LEN + 2);
+
+	*buff++ = ROSE_GFI | ROSE_Q_BIT;
+	*buff++ = 0x00;
+	*buff++ = ROSE_DATA;
+	*buff++ = 0x7F;
+	*buff++ = AX25_P_IP;
+
+	if (daddr != NULL)
+		return 37;
+
+	return -37;
+}
+
+static int rose_rebuild_header(void *buff, struct device *dev,
+	unsigned long raddr, struct sk_buff *skb)
+{
+	struct enet_statistics *stats = (struct enet_statistics *)dev->priv;
+	unsigned char *bp = (unsigned char *)buff;
+	struct sk_buff *skbn;
+
+	if (!arp_query(bp + 7, raddr, dev)) {
+		dev_kfree_skb(skb, FREE_WRITE);
+		return 1;
+	}
+
+	if ((skbn = skb_clone(skb, GFP_ATOMIC)) == NULL) {
+		dev_kfree_skb(skb, FREE_WRITE);
+		return 1;
+	}
+
+	skbn->sk = skb->sk;
+
+	if (skbn->sk != NULL)
+		atomic_add(skbn->truesize, &skbn->sk->wmem_alloc);
+
+	dev_kfree_skb(skb, FREE_WRITE);
+
+	if (!rose_route_frame(skbn, NULL)) {
+		dev_kfree_skb(skbn, FREE_WRITE);
+		stats->tx_errors++;
+	}
+
+	stats->tx_packets++;
+
+	return 1;
+}
+
+static int rose_set_mac_address(struct device *dev, void *addr)
+{
+	struct sockaddr *sa = addr;
+
+	ax25_listen_release((ax25_address *)dev->dev_addr, NULL);
+
+	memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
+
+	ax25_listen_register((ax25_address *)dev->dev_addr, NULL);
+
+	return 0;
+}
+
+static int rose_open(struct device *dev)
+{
+	dev->tbusy = 0;
+	dev->start = 1;
+
+	ax25_listen_register((ax25_address *)dev->dev_addr, NULL);
+
+	return 0;
+}
+
+static int rose_close(struct device *dev)
+{
+	dev->tbusy = 1;
+	dev->start = 0;
+
+	ax25_listen_release((ax25_address *)dev->dev_addr, NULL);
+
+	return 0;
+}
+
+static int rose_xmit(struct sk_buff *skb, struct device *dev)
+{
+	struct enet_statistics *stats = (struct enet_statistics *)dev->priv;
+
+	if (skb == NULL || dev == NULL)
+		return 0;
+
+	if (!dev->start) {
+		printk(KERN_ERR "rose: xmit call when iface is down\n");
+		return 1;
+	}
+
+	cli();
+
+	if (dev->tbusy != 0) {
+		sti();
+		stats->tx_errors++;
+		return 1;
+	}
+
+	dev->tbusy = 1;
+
+	sti();
+
+	dev_kfree_skb(skb, FREE_WRITE);
+
+	stats->tx_errors++;
+
+	dev->tbusy = 0;
+
+	mark_bh(NET_BH);
+
+	return 0;
+}
+
+static struct enet_statistics *rose_get_stats(struct device *dev)
+{
+	return (struct enet_statistics *)dev->priv;
+}
+
+int rose_init(struct device *dev)
+{
+	int i;
+
+	dev->mtu		= ROSE_MAX_PACKET_SIZE - 2;
+	dev->tbusy		= 0;
+	dev->hard_start_xmit	= rose_xmit;
+	dev->open		= rose_open;
+	dev->stop		= rose_close;
+
+	dev->hard_header	= rose_header;
+	dev->hard_header_len	= AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + ROSE_MIN_LEN;
+	dev->addr_len		= ROSE_ADDR_LEN;
+	dev->type		= ARPHRD_ROSE;
+	dev->rebuild_header	= rose_rebuild_header;
+	dev->set_mac_address    = rose_set_mac_address;
+
+	/* New-style flags. */
+	dev->flags		= 0;
+	dev->family		= AF_INET;
+
+#ifdef CONFIG_INET
+	dev->pa_addr		= in_aton("192.168.0.1");
+	dev->pa_brdaddr		= in_aton("192.168.0.255");
+	dev->pa_mask		= in_aton("255.255.255.0");
+	dev->pa_alen		= 4;
+#endif
+
+	if ((dev->priv = kmalloc(sizeof(struct enet_statistics), GFP_KERNEL)) == NULL)
+		return -ENOMEM;
+
+	memset(dev->priv, 0, sizeof(struct enet_statistics));
+
+	dev->get_stats = rose_get_stats;
+
+	/* Fill in the generic fields of the device structure. */
+	for (i = 0; i < DEV_NUMBUFFS; i++)
+		skb_queue_head_init(&dev->buffs[i]);
+
+	return 0;
+};
+
+#endif