patch-2.3.50 linux/drivers/net/appletalk/ipddp.c

• Lines: 359
• Date: Fri Mar 3 12:54:44 2000
• Orig file: v2.3.49/linux/drivers/net/appletalk/ipddp.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.49/linux/drivers/net/appletalk/ipddp.c linux/drivers/net/appletalk/ipddp.c
@@ -0,0 +1,358 @@
+/*
+ *	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@turbolinux.com>
+ *
+ *	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@turbolinux.com>
+ *
+ *      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 Public License, incorporated herein by reference.
+ */
+
+static const char *version = 
+	"ipddp.c:v0.01 8/28/97 Bradford W. Johnson <johns393@maroon.tc.umn.edu>\n";
+
+#include <linux/config.h>
+#ifdef MODULE
+#include <linux/module.h>
+#include <linux/version.h>
+#endif
+
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/types.h>
+#include <linux/fcntl.h>
+#include <linux/interrupt.h>
+#include <linux/ptrace.h>
+#include <linux/ioport.h>
+#include <linux/in.h>
+#include <linux/malloc.h>
+#include <linux/string.h>
+#include <asm/uaccess.h>
+#include <asm/system.h>
+#include <asm/bitops.h>
+#include <asm/io.h>
+#include <asm/dma.h>
+#include <linux/errno.h>
+#include <linux/netdevice.h>
+#include <linux/inetdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/skbuff.h>
+#include <linux/if_arp.h>
+#include <linux/atalk.h>
+#include <linux/ip.h>
+#include <net/route.h>
+#include <linux/inet.h>
+
+#include "ipddp.h"		/* Our stuff */
+
+static struct ipddp_route *ipddp_route_list = NULL;
+
+#ifdef CONFIG_IPDDP_ENCAP
+static int ipddp_mode = IPDDP_ENCAP;
+#else
+static int ipddp_mode = IPDDP_DECAP;
+#endif
+
+/* Use 0 for production, 1 for verification, 2 for debug, 3 for verbose debug */
+#ifndef IPDDP_DEBUG
+#define IPDDP_DEBUG 1
+#endif
+static unsigned int ipddp_debug = IPDDP_DEBUG;
+
+/* 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 int ipddp_open(struct net_device *dev)
+{
+#ifdef MODULE
+        MOD_INC_USE_COUNT;
+#endif
+
+        return 0;
+}
+
+static int ipddp_close(struct net_device *dev)
+{
+#ifdef MODULE
+        MOD_DEC_USE_COUNT;
+#endif
+
+        return 0;
+}
+
+int ipddp_init(struct net_device *dev)
+{
+	static unsigned version_printed = 0;
+
+	if (ipddp_debug && version_printed++ == 0)
+                printk("%s", version);
+
+	/* 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@turbolinux.com>\n", 
+			dev->name);
+
+	/* Fill in the device structure with ethernet-generic values. */
+        ether_setup(dev);
+
+	/* Initalize the device structure. */
+        dev->hard_start_xmit = ipddp_xmit;
+
+        dev->priv = kmalloc(sizeof(struct enet_statistics), GFP_KERNEL);
+        if(!dev->priv)
+                return -ENOMEM;
+        memset(dev->priv,0,sizeof(struct enet_statistics));
+
+	dev->open 	    = ipddp_open;
+        dev->stop 	    = ipddp_close;
+        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;
+
+        return 0;
+}
+
+/*
+ * 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 (struct net_device_stats *)dev->priv;
+}
+
+/*
+ * Transmit LLAP/ELAP frame using aarp_send_ddp.
+ */
+static int ipddp_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+	u32 paddr = ((struct rtable*)skb->dst)->rt_gateway;
+        struct ddpehdr *ddp;
+        struct ipddp_route *rt;
+        struct at_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 = skb->len;
+        ddp->deh_hops = 1;
+        ddp->deh_pad = 0;
+        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 */
+        *((__u16 *)ddp)=ntohs(*((__u16 *)ddp));	/* fix up length field */
+
+        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 =(struct ipddp_route*) kmalloc(sizeof(*rt), GFP_KERNEL);
+	struct ipddp_route *test;
+
+        if(rt == NULL)
+                return -ENOMEM;
+
+        rt->ip = new_rt->ip;
+        rt->at = new_rt->at;
+        rt->next = NULL;
+        rt->dev = atrtr_get_dev(&rt->at);
+        if(rt->dev == NULL)
+                return (-ENETUNREACH);
+
+	test = ipddp_find_route(rt);
+	if(test != NULL)
+		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_s(tmp, sizeof(struct ipddp_route));
+                        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 *rt = (struct ipddp_route *)ifr->ifr_data;
+
+        if(!capable(CAP_NET_ADMIN))
+                return -EPERM;
+
+        switch(cmd)
+        {
+		case SIOCADDIPDDPRT:
+                        return (ipddp_create(rt));
+
+                case SIOCFINDIPDDPRT:
+                        if(copy_to_user(rt, ipddp_find_route(rt), sizeof(struct ipddp_route)))
+                                return -EFAULT;
+                        return 0;
+
+                case SIOCDELIPDDPRT:
+                        return (ipddp_delete(rt));
+
+                default:
+                        return -EINVAL;
+        }
+}
+
+#ifdef MODULE	/* Module specific functions for ipddp.c */
+
+static struct net_device dev_ipddp=
+{
+        "ipddp0\0   ",
+                0, 0, 0, 0,
+                0x0, 0,
+                0, 0, 0, NULL, ipddp_init
+};
+
+MODULE_PARM(ipddp_mode, "i");
+
+int init_module(void)
+{
+	int err;
+
+	err=dev_alloc_name(&dev_ipddp, "ipddp%d");
+        if(err < 0)
+                return err;
+
+	if(register_netdev(&dev_ipddp) != 0)
+                return -EIO;
+
+	return 0;
+}
+
+void cleanup_module(void)
+{
+	unregister_netdev(&dev_ipddp);
+        kfree(dev_ipddp.priv);
+	dev_ipddp.priv = NULL;
+}
+
+#endif /* MODULE */