patch-2.1.71 linux/drivers/net/bpqether.c

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diff -u --recursive --new-file v2.1.70/linux/drivers/net/bpqether.c linux/drivers/net/bpqether.c
@@ -1,669 +0,0 @@
-/*
- *	G8BPQ compatible "AX.25 via ethernet" driver release 003
- *
- *	This code REQUIRES 2.0.0 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.
- *
- *	This is a "pseudo" network driver to allow AX.25 over Ethernet
- *	using G8BPQ encapsulation. It has been extracted from the protocol
- *	implementation because
- *
- *		- things got unreadable within the protocol stack
- *		- to cure the protocol stack from "feature-ism"
- *		- a protocol implementation shouldn't need to know on
- *		  which hardware it is running
- *		- user-level programs like the AX.25 utilities shouldn't
- *		  need to know about the hardware.
- *		- IP over ethernet encapsulated AX.25 was impossible
- *		- rxecho.c did not work
- *		- to have room for extensions
- *		- it just deserves to "live" as an own driver
- *
- *	This driver can use any ethernet destination address, and can be
- *	limited to accept frames from one dedicated ethernet card only.
- *
- *	Note that the driver sets up the BPQ devices automagically on
- *	startup or (if started before the "insmod" of an ethernet device)
- *	on "ifconfig up". It hopefully will remove the BPQ on "rmmod"ing
- *	the ethernet device (in fact: as soon as another ethernet or bpq
- *	device gets "ifconfig"ured).
- *
- *	I have heard that several people are thinking of experiments
- *	with highspeed packet radio using existing ethernet cards.
- *	Well, this driver is prepared for this purpose, just add
- *	your tx key control and a txdelay / tailtime algorithm,
- *	probably some buffering, and /voila/...
- *
- *	History
- *	BPQ   001	Joerg(DL1BKE)		Extracted BPQ code from AX.25
- *						protocol stack and added my own
- *						yet existing patches
- *	BPQ   002	Joerg(DL1BKE)		Scan network device list on
- *						startup.
- *	BPQ   003	Joerg(DL1BKE)		Ethernet destination address
- *						and accepted source address
- *						can be configured by an ioctl()
- *						call.
- *						Fixed to match Linux networking
- *						changes - 2.1.15.
- */
-
-#include <linux/config.h>
-#include <linux/errno.h>
-#include <linux/types.h>
-#include <linux/socket.h>
-#include <linux/in.h>
-#include <linux/kernel.h>
-#include <linux/string.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/segment.h>
-#include <asm/system.h>
-#include <asm/uaccess.h>
-#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/module.h>
-#include <linux/init.h>
-
-#include <net/ip.h>
-#include <net/arp.h>
-
-#include <linux/bpqether.h>
-
-static unsigned char ax25_bcast[AX25_ADDR_LEN] =
-	{'Q' << 1, 'S' << 1, 'T' << 1, ' ' << 1, ' ' << 1, ' ' << 1, '0' << 1};
-static unsigned char ax25_defaddr[AX25_ADDR_LEN] =
-	{'L' << 1, 'I' << 1, 'N' << 1, 'U' << 1, 'X' << 1, ' ' << 1, '1' << 1};
-
-static char bcast_addr[6]={0xFF,0xFF,0xFF,0xFF,0xFF,0xFF};
-
-static char bpq_eth_addr[6];
-
-static int bpq_rcv(struct sk_buff *, struct device *, struct packet_type *);
-static int bpq_device_event(struct notifier_block *, unsigned long, void *);
-static char *bpq_print_ethaddr(unsigned char *);
-
-static struct packet_type bpq_packet_type = {
-	0,		/* ntohs(ETH_P_BPQ),*/
-	0,		/* copy */
-	bpq_rcv,
-	NULL,
-	NULL,
-};
-
-static struct notifier_block bpq_dev_notifier = {
-	bpq_device_event,
-	0
-};
-
-
-#define MAXBPQDEV 100
-
-static struct bpqdev {
-	struct bpqdev *next;
-	char   ethname[14];		/* ether device name */
-	struct device *ethdev;		/* link to ethernet device */
-	struct device axdev;		/* bpq device (bpq#) */
-	struct net_device_stats stats;	/* some statistics */
-	char   dest_addr[6];		/* ether destination address */
-	char   acpt_addr[6];		/* accept ether frames from this address only */
-} *bpq_devices = NULL;
-
-
-/* ------------------------------------------------------------------------ */
-
-
-/*
- *	Get the ethernet device for a BPQ device
- */
-static __inline__ struct device *bpq_get_ether_dev(struct device *dev)
-{
-	struct bpqdev *bpq;
-
-	bpq = (struct bpqdev *)dev->priv;
-
-	return (bpq != NULL) ? bpq->ethdev : NULL;
-}
-
-/*
- *	Get the BPQ device for the ethernet device
- */
-static __inline__ struct device *bpq_get_ax25_dev(struct device *dev)
-{
-	struct bpqdev *bpq;
-
-	for (bpq = bpq_devices; bpq != NULL; bpq = bpq->next)
-		if (bpq->ethdev == dev)
-			return &bpq->axdev;
-
-	return NULL;
-}
-
-static __inline__ int dev_is_ethdev(struct device *dev)
-{
-	return (
-			dev->type == ARPHRD_ETHER
-			&& strncmp(dev->name, "dummy", 5)
-	);
-}
-
-/*
- *	Sanity check: remove all devices that ceased to exists and
- *	return '1' if the given BPQ device was affected.
- */
-static int bpq_check_devices(struct device *dev)
-{
-	struct bpqdev *bpq, *bpq_prev;
-	int result = 0;
-	unsigned long flags;
-
-	save_flags(flags);
-	cli();
-
-	bpq_prev = NULL;
-
-	for (bpq = bpq_devices; bpq != NULL; bpq = bpq->next) {
-		if (!dev_get(bpq->ethname)) {
-			if (bpq_prev)
-				bpq_prev->next = bpq->next;
-			else
-				bpq_devices = bpq->next;
-
-			if (&bpq->axdev == dev)
-				result = 1;
-
-			unregister_netdev(&bpq->axdev);
-			kfree(bpq);
-		}
-
-		bpq_prev = bpq;
-	}
-
-	restore_flags(flags);
-
-	return result;
-}
-
-
-/* ------------------------------------------------------------------------ */
-
-
-/*
- *	Receive an AX.25 frame via an ethernet interface.
- */
-static int bpq_rcv(struct sk_buff *skb, struct device *dev, struct packet_type *ptype)
-{
-	int len;
-	char * ptr;
-	struct ethhdr *eth = (struct ethhdr *)skb->mac.raw;
-	struct bpqdev *bpq;
-
-	skb->sk = NULL;		/* Initially we don't know who it's for */
-
-	dev = bpq_get_ax25_dev(dev);
-
-	if (dev == NULL || dev->start == 0) {
-		kfree_skb(skb, FREE_READ);
-		return 0;
-	}
-
-	/*
-	 * if we want to accept frames from just one ethernet device
-	 * we check the source address of the sender.
-	 */
-
-	bpq = (struct bpqdev *)dev->priv;
-
-	if (!(bpq->acpt_addr[0] & 0x01) && memcmp(eth->h_source, bpq->acpt_addr, ETH_ALEN)) {
-		printk(KERN_DEBUG "bpqether: wrong dest %s\n", bpq_print_ethaddr(eth->h_source));
-		kfree_skb(skb, FREE_READ);
-		return 0;
-	}
-
-	len = skb->data[0] + skb->data[1] * 256 - 5;
-
-	skb_pull(skb, 2);	/* Remove the length bytes */
-	skb_trim(skb, len);	/* Set the length of the data */
-
-	((struct bpqdev *)dev->priv)->stats.rx_packets++;
-	((struct bpqdev *)dev->priv)->stats.rx_bytes+=len;
-
-	ptr = skb_push(skb, 1);
-	*ptr = 0;
-
-	skb->dev = dev;
-	skb->protocol = htons(ETH_P_AX25);
-	skb->mac.raw = skb->data;
-	skb->pkt_type = PACKET_HOST;
-
-	netif_rx(skb);
-
-	return 0;
-}
-
-/*
- * 	Send an AX.25 frame via an ethernet interface
- */
-static int bpq_xmit(struct sk_buff *skb, struct device *dev)
-{
-	struct sk_buff *newskb;
-	unsigned char *ptr;
-	struct bpqdev *bpq;
-	int size;
-
-	/*
-	 * Just to be *really* sure not to send anything if the interface
-	 * is down, the ethernet device may have gone.
-	 */
-	if (!dev->start) {
-		bpq_check_devices(dev);
-		kfree_skb(skb, FREE_WRITE);
-		return -ENODEV;
-	}
-
-	skb_pull(skb, 1);
-	size = skb->len;
-
-	/*
-	 * The AX.25 code leaves enough room for the ethernet header, but
-	 * sendto() does not.
-	 */
-	if (skb_headroom(skb) < AX25_BPQ_HEADER_LEN) {	/* Ough! */
-		if ((newskb = skb_realloc_headroom(skb, AX25_BPQ_HEADER_LEN)) == NULL) {
-			printk(KERN_WARNING "bpqether: out of memory\n");
-			kfree_skb(skb, FREE_WRITE);
-			return -ENOMEM;
-		}
-
-		if (skb->sk != NULL)
-			skb_set_owner_w(newskb, skb->sk);
-
-		kfree_skb(skb, FREE_WRITE);
-		skb = newskb;
-	}
-
-	skb->protocol = htons(ETH_P_AX25);
-
-	ptr = skb_push(skb, 2);
-
-	*ptr++ = (size + 5) % 256;
-	*ptr++ = (size + 5) / 256;
-
-	bpq = (struct bpqdev *)dev->priv;
-
-	if ((dev = bpq_get_ether_dev(dev)) == NULL) {
-		bpq->stats.tx_dropped++;
-		kfree_skb(skb, FREE_WRITE);
-		return -ENODEV;
-	}
-
-	skb->dev = dev;
-	dev->hard_header(skb, dev, ETH_P_BPQ, bpq->dest_addr, NULL, 0);
-	bpq->stats.tx_packets++;
-	bpq->stats.tx_bytes+=skb->len;
-  
-	dev_queue_xmit(skb);
-
-	return 0;
-}
-
-/*
- *	Statistics
- */
-static struct net_device_stats *bpq_get_stats(struct device *dev)
-{
-	struct bpqdev *bpq;
-
-	bpq = (struct bpqdev *)dev->priv;
-
-	return &bpq->stats;
-}
-
-/*
- *	Set AX.25 callsign
- */
-static int bpq_set_mac_address(struct device *dev, void *addr)
-{
-    struct sockaddr *sa = (struct sockaddr *)addr;
-
-    memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
-
-    return 0;
-}
-
-/*	Ioctl commands
- *
- *		SIOCSBPQETHOPT		reserved for enhancements
- *		SIOCSBPQETHADDR		set the destination and accepted
- *					source ethernet address (broadcast
- *					or multicast: accept all)
- */
-static int bpq_ioctl(struct device *dev, struct ifreq *ifr, int cmd)
-{
-	int err;
-	struct bpq_ethaddr *ethaddr = (struct bpq_ethaddr *)ifr->ifr_data;
-	struct bpqdev *bpq = dev->priv;
-	struct bpq_req req;
-
-	if (!suser())
-		return -EPERM;
-
-	if (bpq == NULL)		/* woops! */
-		return -ENODEV;
-
-	switch (cmd) {
-		case SIOCSBPQETHOPT:
-			if ((err = verify_area(VERIFY_WRITE, ifr->ifr_data, sizeof(struct bpq_req))) != 0)
-				return err;
-			copy_from_user(&req, ifr->ifr_data, sizeof(struct bpq_req));
-			switch (req.cmd) {
-				case SIOCGBPQETHPARAM:
-				case SIOCSBPQETHPARAM:
-				default:
-					return -EINVAL;
-			}
-
-			break;
-
-		case SIOCSBPQETHADDR:
-			if ((err = verify_area(VERIFY_READ, ethaddr, sizeof(struct bpq_ethaddr))) != 0)
-				return err;
-			copy_from_user(bpq->dest_addr, ethaddr->destination, ETH_ALEN);
-			copy_from_user(bpq->acpt_addr, ethaddr->accept, ETH_ALEN);
-			break;
-
-		default:
-			return -EINVAL;
-	}
-
-	return 0;
-}
-
-/*
- * open/close a device
- */
-static int bpq_open(struct device *dev)
-{
-	if (bpq_check_devices(dev))
-		return -ENODEV;		/* oops, it's gone */
-
-	dev->tbusy = 0;
-	dev->start = 1;
-
-	MOD_INC_USE_COUNT;
-
-	return 0;
-}
-
-static int bpq_close(struct device *dev)
-{
-	dev->tbusy = 1;
-	dev->start = 0;
-
-	MOD_DEC_USE_COUNT;
-
-	return 0;
-}
-
-/*
- * currently unused
- */
-static int bpq_dev_init(struct device *dev)
-{
-	return 0;
-}
-
-
-/* ------------------------------------------------------------------------ */
-
-
-/*
- *	Proc filesystem
- */
-static char * bpq_print_ethaddr(unsigned char *e)
-{
-	static char buf[18];
-
-	sprintf(buf, "%2.2X:%2.2X:%2.2X:%2.2X:%2.2X:%2.2X",
-		e[0], e[1], e[2], e[3], e[4], e[5]);
-
-	return buf;
-}
-
-int bpq_get_info(char *buffer, char **start, off_t offset, int length, int dummy)
-{
-	struct bpqdev *bpqdev;
-	int len     = 0;
-	off_t pos   = 0;
-	off_t begin = 0;
-
-	cli();
-
-	len += sprintf(buffer, "dev   ether      destination        accept from\n");
-
-	for (bpqdev = bpq_devices; bpqdev != NULL; bpqdev = bpqdev->next) {
-		len += sprintf(buffer + len, "%-5s %-10s %s  ",
-			bpqdev->axdev.name, bpqdev->ethname,
-			bpq_print_ethaddr(bpqdev->dest_addr));
-
-		len += sprintf(buffer + len, "%s\n",
-			(bpqdev->acpt_addr[0] & 0x01) ? "*" : bpq_print_ethaddr(bpqdev->acpt_addr));
-
-		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;
-}
-
-
-/* ------------------------------------------------------------------------ */
-
-
-/*
- *	Setup a new device.
- */
-static int bpq_new_device(struct device *dev)
-{
-	int k;
-	unsigned char *buf;
-	struct bpqdev *bpq, *bpq2;
-
-	if ((bpq = kmalloc(sizeof(struct bpqdev), GFP_KERNEL)) == NULL)
-		return -ENOMEM;
-
-	memset(bpq, 0, sizeof(struct bpqdev));
-
-	bpq->ethdev = dev;
-
-	bpq->ethname[sizeof(bpq->ethname)-1] = '\0';
-	strncpy(bpq->ethname, dev->name, sizeof(bpq->ethname)-1);
-
-	memcpy(bpq->dest_addr, bcast_addr, sizeof(bpq_eth_addr));
-	memcpy(bpq->acpt_addr, bcast_addr, sizeof(bpq_eth_addr));
-
-	dev = &bpq->axdev;
-	buf = kmalloc(14, GFP_KERNEL);
-
-	for (k = 0; k < MAXBPQDEV; k++) {
-		struct device *odev;
-
-		sprintf(buf, "bpq%d", k);
-
-		if ((odev = dev_get(buf)) == NULL || bpq_check_devices(odev))
-			break;
-	}
-
-	if (k == MAXBPQDEV) {
-		kfree(bpq);
-		return -ENODEV;
-	}
-
-	dev->priv = (void *)bpq;	/* pointer back */
-	dev->name = buf;
-	dev->init = bpq_dev_init;
-
-	if (register_netdev(dev) != 0) {
-		kfree(bpq);
-                return -EIO;
-        }
-
-	dev_init_buffers(dev);
-
-	dev->hard_start_xmit = bpq_xmit;
-	dev->open	     = bpq_open;
-	dev->stop	     = bpq_close;
-	dev->set_mac_address = bpq_set_mac_address;
-	dev->get_stats	     = bpq_get_stats;
-	dev->do_ioctl	     = bpq_ioctl;
-
-	memcpy(dev->broadcast, ax25_bcast, AX25_ADDR_LEN);
-	memcpy(dev->dev_addr,  ax25_defaddr, AX25_ADDR_LEN);
-
-	dev->flags      = 0;
-
-#if defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE)
-	dev->hard_header     = ax25_encapsulate;
-	dev->rebuild_header  = ax25_rebuild_header;
-#endif
-
-	dev->type            = ARPHRD_AX25;
-	dev->hard_header_len = AX25_MAX_HEADER_LEN + AX25_BPQ_HEADER_LEN;
-	dev->mtu             = AX25_DEF_PACLEN;
-	dev->addr_len        = AX25_ADDR_LEN;
-
-	cli();
-
-	if (bpq_devices == NULL) {
-		bpq_devices = bpq;
-	} else {
-		for (bpq2 = bpq_devices; bpq2->next != NULL; bpq2 = bpq2->next);
-		bpq2->next = bpq;
-	}
-
-	sti();
-
-	return 0;
-}
-
-
-/*
- *	Handle device status changes.
- */
-static int bpq_device_event(struct notifier_block *this,unsigned long event, void *ptr)
-{
-	struct device *dev = (struct device *)ptr;
-
-	if (!dev_is_ethdev(dev))
-		return NOTIFY_DONE;
-
-	bpq_check_devices(NULL);
-
-	switch (event) {
-		case NETDEV_UP:		/* new ethernet device -> new BPQ interface */
-			if (bpq_get_ax25_dev(dev) == NULL)
-				bpq_new_device(dev);
-			break;
-
-		case NETDEV_DOWN:	/* ethernet device closed -> close BPQ interface */
-			if ((dev = bpq_get_ax25_dev(dev)) != NULL)
-				dev_close(dev);
-			break;
-
-		default:
-			break;
-	}
-
-	return NOTIFY_DONE;
-}
-
-
-/* ------------------------------------------------------------------------ */
-
-/*
- * Initialize driver. To be called from af_ax25 if not compiled as a
- * module
- */
-__initfunc(int bpq_init(void))
-{
-	struct device *dev;
-
-	bpq_packet_type.type  = htons(ETH_P_BPQ);
-	dev_add_pack(&bpq_packet_type);
-
-	register_netdevice_notifier(&bpq_dev_notifier);
-
-	printk(KERN_INFO "AX.25 ethernet driver version 0.01\n");
-
-#ifdef CONFIG_PROC_FS
-	proc_net_register(&(struct proc_dir_entry) {
-		PROC_NET_AX25_BPQETHER, 8, "bpqether",
-		S_IFREG | S_IRUGO, 1, 0, 0,
-		0, &proc_net_inode_operations,
-		bpq_get_info
-	});
-#endif
-
-	for (dev = dev_base; dev != NULL; dev = dev->next) {
-		if (dev_is_ethdev(dev))
-			bpq_new_device(dev);
-	}
-
-	return 0;
-}
-
-#ifdef MODULE
-EXPORT_NO_SYMBOLS;
-
-MODULE_AUTHOR("Joerg Reuter DL1BKE <jreuter@lykos.oche.de>");
-MODULE_DESCRIPTION("Transmit and receive AX.25 packets over Ethernet");
-
-int init_module(void)
-{
-	return bpq_init();
-}
-
-void cleanup_module(void)
-{
-	struct bpqdev *bpq;
-
-	dev_remove_pack(&bpq_packet_type);
-
-	unregister_netdevice_notifier(&bpq_dev_notifier);
-
-#ifdef CONFIG_PROC_FS
-	proc_net_unregister(PROC_NET_AX25_BPQETHER);
-#endif
-
-	for (bpq = bpq_devices; bpq != NULL; bpq = bpq->next)
-		unregister_netdev(&bpq->axdev);
-}
-#endif
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