[deliverable/linux.git] / drivers / net / appletalk / ipddp.c

/*
 *	ipddp.c: IP to Appletalk-IP Encapsulation driver for Linux
 *		 Appletalk-IP to IP Decapsulation driver for Linux
 *
 *	Authors:
 *      - DDP-IP Encap by: Bradford W. Johnson <johns393@maroon.tc.umn.edu>
 *	- DDP-IP Decap by: Jay Schulist <jschlst@samba.org>
 *
 *	Derived from:
 *	- Almost all code already existed in net/appletalk/ddp.c I just
 *	  moved/reorginized it into a driver file. Original IP-over-DDP code
 *	  was done by Bradford W. Johnson <johns393@maroon.tc.umn.edu>
 *      - skeleton.c: A network driver outline for linux.
 *        Written 1993-94 by Donald Becker.
 *	- dummy.c: A dummy net driver. By Nick Holloway.
 *	- MacGate: A user space Daemon for Appletalk-IP Decap for
 *	  Linux by Jay Schulist <jschlst@samba.org>
 *
 *      Copyright 1993 United States Government as represented by the
 *      Director, National Security Agency.
 *
 *      This software may be used and distributed according to the terms
 *      of the GNU General Public License, incorporated herein by reference.
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/ip.h>
#include <linux/atalk.h>
#include <linux/if_arp.h>
#include <net/route.h>
#include <asm/uaccess.h>

#include "ipddp.h"		/* Our stuff */

static const char version[] = KERN_INFO "ipddp.c:v0.01 8/28/97 Bradford W. Johnson <johns393@maroon.tc.umn.edu>\n";

static struct ipddp_route *ipddp_route_list;

#ifdef CONFIG_IPDDP_ENCAP
static int ipddp_mode = IPDDP_ENCAP;
#else
static int ipddp_mode = IPDDP_DECAP;
#endif

/* Index to functions, as function prototypes. */
static int ipddp_xmit(struct sk_buff *skb, struct net_device *dev);
static struct net_device_stats *ipddp_get_stats(struct net_device *dev);
static int ipddp_create(struct ipddp_route *new_rt);
static int ipddp_delete(struct ipddp_route *rt);
static struct ipddp_route* ipddp_find_route(struct ipddp_route *rt);
static int ipddp_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd);


static struct net_device * __init ipddp_init(void)
{
	static unsigned version_printed;
	struct net_device *dev;
	int err;

	dev = alloc_etherdev(sizeof(struct net_device_stats));
	if (!dev)
		return ERR_PTR(-ENOMEM);

	strcpy(dev->name, "ipddp%d");

	if (version_printed++ == 0)
                printk(version);

	/* Initalize the device structure. */
        dev->hard_start_xmit = ipddp_xmit;
        dev->get_stats      = ipddp_get_stats;
        dev->do_ioctl       = ipddp_ioctl;

        dev->type = ARPHRD_IPDDP;       	/* IP over DDP tunnel */
        dev->mtu = 585;
        dev->flags |= IFF_NOARP;

        /*
         *      The worst case header we will need is currently a
         *      ethernet header (14 bytes) and a ddp header (sizeof ddpehdr+1)
         *      We send over SNAP so that takes another 8 bytes.
         */
        dev->hard_header_len = 14+8+sizeof(struct ddpehdr)+1;

	err = register_netdev(dev);
	if (err) {
		free_netdev(dev);
		return ERR_PTR(err);
	}

	/* Let the user now what mode we are in */
	if(ipddp_mode == IPDDP_ENCAP)
		printk("%s: Appletalk-IP Encap. mode by Bradford W. Johnson <johns393@maroon.tc.umn.edu>\n", 
			dev->name);
	if(ipddp_mode == IPDDP_DECAP)
		printk("%s: Appletalk-IP Decap. mode by Jay Schulist <jschlst@samba.org>\n", 
			dev->name);

        return dev;
}

/*
 * Get the current statistics. This may be called with the card open or closed.
 */
static struct net_device_stats *ipddp_get_stats(struct net_device *dev)
{
        return dev->priv;
}

/*
 * Transmit LLAP/ELAP frame using aarp_send_ddp.
 */
static int ipddp_xmit(struct sk_buff *skb, struct net_device *dev)
{
	__be32 paddr = ((struct rtable*)skb->dst)->rt_gateway;
        struct ddpehdr *ddp;
        struct ipddp_route *rt;
        struct atalk_addr *our_addr;

	/*
         * Find appropriate route to use, based only on IP number.
         */
        for(rt = ipddp_route_list; rt != NULL; rt = rt->next)
        {
                if(rt->ip == paddr)
                        break;
        }
        if(rt == NULL)
                return 0;

        our_addr = atalk_find_dev_addr(rt->dev);

	if(ipddp_mode == IPDDP_DECAP)
		/* 
		 * Pull off the excess room that should not be there.
		 * This is due to a hard-header problem. This is the
		 * quick fix for now though, till it breaks.
		 */
		skb_pull(skb, 35-(sizeof(struct ddpehdr)+1));

	/* Create the Extended DDP header */
	ddp = (struct ddpehdr *)skb->data;
        ddp->deh_len_hops = htons(skb->len + (1<<10));
        ddp->deh_sum = 0;

	/*
         * For Localtalk we need aarp_send_ddp to strip the
         * long DDP header and place a shot DDP header on it.
         */
        if(rt->dev->type == ARPHRD_LOCALTLK)
        {
                ddp->deh_dnet  = 0;   /* FIXME more hops?? */
                ddp->deh_snet  = 0;
        }
        else
        {
                ddp->deh_dnet  = rt->at.s_net;   /* FIXME more hops?? */
                ddp->deh_snet  = our_addr->s_net;
        }
        ddp->deh_dnode = rt->at.s_node;
        ddp->deh_snode = our_addr->s_node;
        ddp->deh_dport = 72;
        ddp->deh_sport = 72;

        *((__u8 *)(ddp+1)) = 22;        	/* ddp type = IP */

        skb->protocol = htons(ETH_P_ATALK);     /* Protocol has changed */

	((struct net_device_stats *) dev->priv)->tx_packets++;
        ((struct net_device_stats *) dev->priv)->tx_bytes+=skb->len;

        if(aarp_send_ddp(rt->dev, skb, &rt->at, NULL) < 0)
                dev_kfree_skb(skb);

        return 0;
}

/*
 * Create a routing entry. We first verify that the
 * record does not already exist. If it does we return -EEXIST
 */
static int ipddp_create(struct ipddp_route *new_rt)
{
        struct ipddp_route *rt = kmalloc(sizeof(*rt), GFP_KERNEL);

        if (rt == NULL)
                return -ENOMEM;

        rt->ip = new_rt->ip;
        rt->at = new_rt->at;
        rt->next = NULL;
        if ((rt->dev = atrtr_get_dev(&rt->at)) == NULL) {
		kfree(rt);
                return -ENETUNREACH;
        }

	if (ipddp_find_route(rt)) {
		kfree(rt);
		return -EEXIST;
	}

        rt->next = ipddp_route_list;
        ipddp_route_list = rt;

        return 0;
}

/*
 * Delete a route, we only delete a FULL match.
 * If route does not exist we return -ENOENT.
 */
static int ipddp_delete(struct ipddp_route *rt)
{
        struct ipddp_route **r = &ipddp_route_list;
        struct ipddp_route *tmp;

        while((tmp = *r) != NULL)
        {
                if(tmp->ip == rt->ip
                        && tmp->at.s_net == rt->at.s_net
                        && tmp->at.s_node == rt->at.s_node)
                {
                        *r = tmp->next;
                        kfree(tmp);
                        return 0;
                }
                r = &tmp->next;
        }

        return (-ENOENT);
}

/*
 * Find a routing entry, we only return a FULL match
 */
static struct ipddp_route* ipddp_find_route(struct ipddp_route *rt)
{
        struct ipddp_route *f;

        for(f = ipddp_route_list; f != NULL; f = f->next)
        {
                if(f->ip == rt->ip
                        && f->at.s_net == rt->at.s_net
                        && f->at.s_node == rt->at.s_node)
                        return (f);
        }

        return (NULL);
}

static int ipddp_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
{
        struct ipddp_route __user *rt = ifr->ifr_data;
        struct ipddp_route rcp;

        if(!capable(CAP_NET_ADMIN))
                return -EPERM;

	if(copy_from_user(&rcp, rt, sizeof(rcp)))
		return -EFAULT;

        switch(cmd)
        {
		case SIOCADDIPDDPRT:
                        return (ipddp_create(&rcp));

                case SIOCFINDIPDDPRT:
                        if(copy_to_user(rt, ipddp_find_route(&rcp), sizeof(struct ipddp_route)))
                                return -EFAULT;
                        return 0;

                case SIOCDELIPDDPRT:
                        return (ipddp_delete(&rcp));

                default:
                        return -EINVAL;
        }
}

static struct net_device *dev_ipddp;

MODULE_LICENSE("GPL");
module_param(ipddp_mode, int, 0);

static int __init ipddp_init_module(void)
{
	dev_ipddp = ipddp_init();
        if (IS_ERR(dev_ipddp))
                return PTR_ERR(dev_ipddp);
	return 0;
}

static void __exit ipddp_cleanup_module(void)
{
        struct ipddp_route *p;

	unregister_netdev(dev_ipddp);
        free_netdev(dev_ipddp);

        while (ipddp_route_list) {
                p = ipddp_route_list->next;
                kfree(ipddp_route_list);
                ipddp_route_list = p;
        }
}

module_init(ipddp_init_module);
module_exit(ipddp_cleanup_module);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* ipddp.c: IP to Appletalk-IP Encapsulation driver for Linux
	3	* Appletalk-IP to IP Decapsulation driver for Linux
	4	*
	5	* Authors:
	6	* - DDP-IP Encap by: Bradford W. Johnson <johns393@maroon.tc.umn.edu>
	7	* - DDP-IP Decap by: Jay Schulist <jschlst@samba.org>
	8	*
	9	* Derived from:
	10	* - Almost all code already existed in net/appletalk/ddp.c I just
	11	* moved/reorginized it into a driver file. Original IP-over-DDP code
	12	* was done by Bradford W. Johnson <johns393@maroon.tc.umn.edu>
	13	* - skeleton.c: A network driver outline for linux.
	14	* Written 1993-94 by Donald Becker.
	15	* - dummy.c: A dummy net driver. By Nick Holloway.
	16	* - MacGate: A user space Daemon for Appletalk-IP Decap for
	17	* Linux by Jay Schulist <jschlst@samba.org>
	18	*
	19	* Copyright 1993 United States Government as represented by the
	20	* Director, National Security Agency.
	21	*
	22	* This software may be used and distributed according to the terms
	23	* of the GNU General Public License, incorporated herein by reference.
	24	*/
	25
1da177e4 LT	26	#include <linux/module.h>
	27	#include <linux/kernel.h>
	28	#include <linux/init.h>
	29	#include <linux/netdevice.h>
	30	#include <linux/etherdevice.h>
	31	#include <linux/ip.h>
	32	#include <linux/atalk.h>
	33	#include <linux/if_arp.h>
	34	#include <net/route.h>
	35	#include <asm/uaccess.h>
	36
	37	#include "ipddp.h" /* Our stuff */
	38
	39	static const char version[] = KERN_INFO "ipddp.c:v0.01 8/28/97 Bradford W. Johnson <johns393@maroon.tc.umn.edu>\n";
	40
	41	static struct ipddp_route *ipddp_route_list;
	42
	43	#ifdef CONFIG_IPDDP_ENCAP
	44	static int ipddp_mode = IPDDP_ENCAP;
	45	#else
	46	static int ipddp_mode = IPDDP_DECAP;
	47	#endif
	48
	49	/* Index to functions, as function prototypes. */
	50	static int ipddp_xmit(struct sk_buff skb, struct net_device dev);
	51	static struct net_device_stats ipddp_get_stats(struct net_device dev);
	52	static int ipddp_create(struct ipddp_route *new_rt);
	53	static int ipddp_delete(struct ipddp_route *rt);
	54	static struct ipddp_route* ipddp_find_route(struct ipddp_route *rt);
	55	static int ipddp_ioctl(struct net_device dev, struct ifreq ifr, int cmd);
	56
	57
	58	static struct net_device * __init ipddp_init(void)
	59	{
	60	static unsigned version_printed;
	61	struct net_device *dev;
	62	int err;
	63
	64	dev = alloc_etherdev(sizeof(struct net_device_stats));
	65	if (!dev)
	66	return ERR_PTR(-ENOMEM);
	67
1da177e4 LT	68	strcpy(dev->name, "ipddp%d");
	69
	70	if (version_printed++ == 0)
	71	printk(version);
	72
	73	/* Initalize the device structure. */
	74	dev->hard_start_xmit = ipddp_xmit;
	75	dev->get_stats = ipddp_get_stats;
	76	dev->do_ioctl = ipddp_ioctl;
	77
	78	dev->type = ARPHRD_IPDDP; /* IP over DDP tunnel */
	79	dev->mtu = 585;
	80	dev->flags \|= IFF_NOARP;
	81
	82	/*
	83	* The worst case header we will need is currently a
	84	* ethernet header (14 bytes) and a ddp header (sizeof ddpehdr+1)
	85	* We send over SNAP so that takes another 8 bytes.
	86	*/
	87	dev->hard_header_len = 14+8+sizeof(struct ddpehdr)+1;
	88
	89	err = register_netdev(dev);
	90	if (err) {
	91	free_netdev(dev);
	92	return ERR_PTR(err);
	93	}
	94
	95	/* Let the user now what mode we are in */
	96	if(ipddp_mode == IPDDP_ENCAP)
	97	printk("%s: Appletalk-IP Encap. mode by Bradford W. Johnson <johns393@maroon.tc.umn.edu>\n",
	98	dev->name);
	99	if(ipddp_mode == IPDDP_DECAP)
	100	printk("%s: Appletalk-IP Decap. mode by Jay Schulist <jschlst@samba.org>\n",
	101	dev->name);
	102
	103	return dev;
	104	}
	105
	106	/*
	107	* Get the current statistics. This may be called with the card open or closed.
	108	*/
	109	static struct net_device_stats ipddp_get_stats(struct net_device dev)
	110	{
	111	return dev->priv;
	112	}
	113
	114	/*
	115	* Transmit LLAP/ELAP frame using aarp_send_ddp.
	116	*/
	117	static int ipddp_xmit(struct sk_buff skb, struct net_device dev)
	118	{
16989ba6	119	__be32 paddr = ((struct rtable*)skb->dst)->rt_gateway;
1da177e4 LT	120	struct ddpehdr *ddp;
	121	struct ipddp_route *rt;
	122	struct atalk_addr *our_addr;
	123
	124	/*
	125	* Find appropriate route to use, based only on IP number.
	126	*/
	127	for(rt = ipddp_route_list; rt != NULL; rt = rt->next)
	128	{
	129	if(rt->ip == paddr)
	130	break;
	131	}
	132	if(rt == NULL)
	133	return 0;
	134
	135	our_addr = atalk_find_dev_addr(rt->dev);
	136
	137	if(ipddp_mode == IPDDP_DECAP)
	138	/*
	139	* Pull off the excess room that should not be there.
	140	* This is due to a hard-header problem. This is the
	141	* quick fix for now though, till it breaks.
	142	*/
	143	skb_pull(skb, 35-(sizeof(struct ddpehdr)+1));
	144
	145	/* Create the Extended DDP header */
	146	ddp = (struct ddpehdr *)skb->data;
2a50f28c	147	ddp->deh_len_hops = htons(skb->len + (1<<10));
1da177e4 LT	148	ddp->deh_sum = 0;
	149
	150	/*
	151	* For Localtalk we need aarp_send_ddp to strip the
	152	* long DDP header and place a shot DDP header on it.
	153	*/
	154	if(rt->dev->type == ARPHRD_LOCALTLK)
	155	{
	156	ddp->deh_dnet = 0; /* FIXME more hops?? */
	157	ddp->deh_snet = 0;
	158	}
	159	else
	160	{
	161	ddp->deh_dnet = rt->at.s_net; /* FIXME more hops?? */
	162	ddp->deh_snet = our_addr->s_net;
	163	}
	164	ddp->deh_dnode = rt->at.s_node;
	165	ddp->deh_snode = our_addr->s_node;
	166	ddp->deh_dport = 72;
	167	ddp->deh_sport = 72;
	168
	169	((__u8 )(ddp+1)) = 22; /* ddp type = IP */
1da177e4 LT	170
	171	skb->protocol = htons(ETH_P_ATALK); /* Protocol has changed */
	172
	173	((struct net_device_stats *) dev->priv)->tx_packets++;
	174	((struct net_device_stats *) dev->priv)->tx_bytes+=skb->len;
	175
	176	if(aarp_send_ddp(rt->dev, skb, &rt->at, NULL) < 0)
	177	dev_kfree_skb(skb);
	178
	179	return 0;
	180	}
	181
	182	/*
	183	* Create a routing entry. We first verify that the
	184	* record does not already exist. If it does we return -EEXIST
	185	*/
	186	static int ipddp_create(struct ipddp_route *new_rt)
	187	{
5cbded58	188	struct ipddp_route rt = kmalloc(sizeof(rt), GFP_KERNEL);
1da177e4 LT	189
	190	if (rt == NULL)
	191	return -ENOMEM;
	192
	193	rt->ip = new_rt->ip;
	194	rt->at = new_rt->at;
	195	rt->next = NULL;
	196	if ((rt->dev = atrtr_get_dev(&rt->at)) == NULL) {
	197	kfree(rt);
	198	return -ENETUNREACH;
	199	}
	200
	201	if (ipddp_find_route(rt)) {
	202	kfree(rt);
	203	return -EEXIST;
	204	}
	205
	206	rt->next = ipddp_route_list;
	207	ipddp_route_list = rt;
	208
	209	return 0;
	210	}
	211
	212	/*
	213	* Delete a route, we only delete a FULL match.
	214	* If route does not exist we return -ENOENT.
	215	*/
	216	static int ipddp_delete(struct ipddp_route *rt)
	217	{
	218	struct ipddp_route **r = &ipddp_route_list;
	219	struct ipddp_route *tmp;
	220
	221	while((tmp = *r) != NULL)
	222	{
	223	if(tmp->ip == rt->ip
	224	&& tmp->at.s_net == rt->at.s_net
	225	&& tmp->at.s_node == rt->at.s_node)
	226	{
	227	*r = tmp->next;
	228	kfree(tmp);
	229	return 0;
	230	}
	231	r = &tmp->next;
	232	}
	233
	234	return (-ENOENT);
	235	}
	236
	237	/*
	238	* Find a routing entry, we only return a FULL match
	239	*/
	240	static struct ipddp_route* ipddp_find_route(struct ipddp_route *rt)
	241	{
	242	struct ipddp_route *f;
	243
	244	for(f = ipddp_route_list; f != NULL; f = f->next)
	245	{
	246	if(f->ip == rt->ip
	247	&& f->at.s_net == rt->at.s_net
	248	&& f->at.s_node == rt->at.s_node)
	249	return (f);
	250	}
	251
	252	return (NULL);
253	}
254
255	static int ipddp_ioctl(struct net_device dev, struct ifreq ifr, int cmd)
256	{
257	struct ipddp_route __user *rt = ifr->ifr_data;
258	struct ipddp_route rcp;
259
260	if(!capable(CAP_NET_ADMIN))
261	return -EPERM;
262
263	if(copy_from_user(&rcp, rt, sizeof(rcp)))
264	return -EFAULT;
265
266	switch(cmd)
267	{
268	case SIOCADDIPDDPRT:
269	return (ipddp_create(&rcp));
270
271	case SIOCFINDIPDDPRT:
272	if(copy_to_user(rt, ipddp_find_route(&rcp), sizeof(struct ipddp_route)))
273	return -EFAULT;
274	return 0;
275
276	case SIOCDELIPDDPRT:
277	return (ipddp_delete(&rcp));
278
279	default:
280	return -EINVAL;
281	}
282	}
283
284	static struct net_device *dev_ipddp;
285
286	MODULE_LICENSE("GPL");
287	module_param(ipddp_mode, int, 0);
288
289	static int __init ipddp_init_module(void)
290	{
291	dev_ipddp = ipddp_init();
292	if (IS_ERR(dev_ipddp))
293	return PTR_ERR(dev_ipddp);
294	return 0;
295	}
296
297	static void __exit ipddp_cleanup_module(void)
298	{
299	struct ipddp_route *p;
300
301	unregister_netdev(dev_ipddp);
302	free_netdev(dev_ipddp);
303
304	while (ipddp_route_list) {
305	p = ipddp_route_list->next;
306	kfree(ipddp_route_list);
307	ipddp_route_list = p;
308	}
309	}
310
311	module_init(ipddp_init_module);
312	module_exit(ipddp_cleanup_module);