335 lines
8.8 KiB
C
335 lines
8.8 KiB
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 <linux/slab.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;
|
|
static DEFINE_SPINLOCK(ipddp_route_lock);
|
|
|
|
#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 netdev_tx_t ipddp_xmit(struct sk_buff *skb,
|
|
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 const struct net_device_ops ipddp_netdev_ops = {
|
|
.ndo_start_xmit = ipddp_xmit,
|
|
.ndo_do_ioctl = ipddp_ioctl,
|
|
.ndo_change_mtu = eth_change_mtu,
|
|
.ndo_set_mac_address = eth_mac_addr,
|
|
.ndo_validate_addr = eth_validate_addr,
|
|
};
|
|
|
|
static struct net_device * __init ipddp_init(void)
|
|
{
|
|
static unsigned version_printed;
|
|
struct net_device *dev;
|
|
int err;
|
|
|
|
dev = alloc_etherdev(0);
|
|
if (!dev)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
netif_keep_dst(dev);
|
|
strcpy(dev->name, "ipddp%d");
|
|
|
|
if (version_printed++ == 0)
|
|
printk(version);
|
|
|
|
/* Initialize the device structure. */
|
|
dev->netdev_ops = &ipddp_netdev_ops;
|
|
|
|
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;
|
|
}
|
|
|
|
|
|
/*
|
|
* Transmit LLAP/ELAP frame using aarp_send_ddp.
|
|
*/
|
|
static netdev_tx_t ipddp_xmit(struct sk_buff *skb, struct net_device *dev)
|
|
{
|
|
__be32 paddr = skb_rtable(skb)->rt_gateway;
|
|
struct ddpehdr *ddp;
|
|
struct ipddp_route *rt;
|
|
struct atalk_addr *our_addr;
|
|
|
|
spin_lock(&ipddp_route_lock);
|
|
|
|
/*
|
|
* 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) {
|
|
spin_unlock(&ipddp_route_lock);
|
|
return NETDEV_TX_OK;
|
|
}
|
|
|
|
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 */
|
|
|
|
dev->stats.tx_packets++;
|
|
dev->stats.tx_bytes += skb->len;
|
|
|
|
aarp_send_ddp(rt->dev, skb, &rt->at, NULL);
|
|
|
|
spin_unlock(&ipddp_route_lock);
|
|
|
|
return NETDEV_TX_OK;
|
|
}
|
|
|
|
/*
|
|
* 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 = kzalloc(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;
|
|
}
|
|
|
|
spin_lock_bh(&ipddp_route_lock);
|
|
if (__ipddp_find_route(rt)) {
|
|
spin_unlock_bh(&ipddp_route_lock);
|
|
kfree(rt);
|
|
return -EEXIST;
|
|
}
|
|
|
|
rt->next = ipddp_route_list;
|
|
ipddp_route_list = rt;
|
|
|
|
spin_unlock_bh(&ipddp_route_lock);
|
|
|
|
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;
|
|
|
|
spin_lock_bh(&ipddp_route_lock);
|
|
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;
|
|
spin_unlock_bh(&ipddp_route_lock);
|
|
kfree(tmp);
|
|
return 0;
|
|
}
|
|
r = &tmp->next;
|
|
}
|
|
|
|
spin_unlock_bh(&ipddp_route_lock);
|
|
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, rcp2, *rp;
|
|
|
|
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:
|
|
spin_lock_bh(&ipddp_route_lock);
|
|
rp = __ipddp_find_route(&rcp);
|
|
if (rp)
|
|
memcpy(&rcp2, rp, sizeof(rcp2));
|
|
spin_unlock_bh(&ipddp_route_lock);
|
|
|
|
if (rp) {
|
|
if (copy_to_user(rt, &rcp2,
|
|
sizeof(struct ipddp_route)))
|
|
return -EFAULT;
|
|
return 0;
|
|
} else
|
|
return -ENOENT;
|
|
|
|
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);
|