Initial import

1 files changed, 335 insertions, 0 deletions

diff --git a/drivers/net/appletalk/ipddp.c b/drivers/net/appletalk/ipddp.c
new file mode 100644
index 000000000..e90c6a733
--- /dev/null
+++ b/drivers/net/appletalk/ipddp.c
@@ -0,0 +1,335 @@
+/*
+ *	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 = 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;
+        }
+
+	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);