2 * ipddp.c: IP to Appletalk-IP Encapsulation driver for Linux
3 * Appletalk-IP to IP Decapsulation driver for Linux
6 * - DDP-IP Encap by: Bradford W. Johnson <johns393@maroon.tc.umn.edu>
7 * - DDP-IP Decap by: Jay Schulist <jschlst@samba.org>
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>
19 * Copyright 1993 United States Government as represented by the
20 * Director, National Security Agency.
22 * This software may be used and distributed according to the terms
23 * of the GNU General Public License, incorporated herein by reference.
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>
32 #include <linux/atalk.h>
33 #include <linux/if_arp.h>
34 #include <linux/slab.h>
35 #include <net/route.h>
36 #include <linux/uaccess.h>
38 #include "ipddp.h" /* Our stuff */
40 static const char version
[] = KERN_INFO
"ipddp.c:v0.01 8/28/97 Bradford W. Johnson <johns393@maroon.tc.umn.edu>\n";
42 static struct ipddp_route
*ipddp_route_list
;
43 static DEFINE_SPINLOCK(ipddp_route_lock
);
45 #ifdef CONFIG_IPDDP_ENCAP
46 static int ipddp_mode
= IPDDP_ENCAP
;
48 static int ipddp_mode
= IPDDP_DECAP
;
51 /* Index to functions, as function prototypes. */
52 static netdev_tx_t
ipddp_xmit(struct sk_buff
*skb
,
53 struct net_device
*dev
);
54 static int ipddp_create(struct ipddp_route
*new_rt
);
55 static int ipddp_delete(struct ipddp_route
*rt
);
56 static struct ipddp_route
* __ipddp_find_route(struct ipddp_route
*rt
);
57 static int ipddp_ioctl(struct net_device
*dev
, struct ifreq
*ifr
, int cmd
);
59 static const struct net_device_ops ipddp_netdev_ops
= {
60 .ndo_start_xmit
= ipddp_xmit
,
61 .ndo_do_ioctl
= ipddp_ioctl
,
62 .ndo_set_mac_address
= eth_mac_addr
,
63 .ndo_validate_addr
= eth_validate_addr
,
66 static struct net_device
* __init
ipddp_init(void)
68 static unsigned version_printed
;
69 struct net_device
*dev
;
72 dev
= alloc_etherdev(0);
74 return ERR_PTR(-ENOMEM
);
77 strcpy(dev
->name
, "ipddp%d");
79 if (version_printed
++ == 0)
82 /* Initialize the device structure. */
83 dev
->netdev_ops
= &ipddp_netdev_ops
;
85 dev
->type
= ARPHRD_IPDDP
; /* IP over DDP tunnel */
87 dev
->flags
|= IFF_NOARP
;
90 * The worst case header we will need is currently a
91 * ethernet header (14 bytes) and a ddp header (sizeof ddpehdr+1)
92 * We send over SNAP so that takes another 8 bytes.
94 dev
->hard_header_len
= 14+8+sizeof(struct ddpehdr
)+1;
96 err
= register_netdev(dev
);
102 /* Let the user now what mode we are in */
103 if(ipddp_mode
== IPDDP_ENCAP
)
104 printk("%s: Appletalk-IP Encap. mode by Bradford W. Johnson <johns393@maroon.tc.umn.edu>\n",
106 if(ipddp_mode
== IPDDP_DECAP
)
107 printk("%s: Appletalk-IP Decap. mode by Jay Schulist <jschlst@samba.org>\n",
115 * Transmit LLAP/ELAP frame using aarp_send_ddp.
117 static netdev_tx_t
ipddp_xmit(struct sk_buff
*skb
, struct net_device
*dev
)
119 __be32 paddr
= skb_rtable(skb
)->rt_gateway
;
121 struct ipddp_route
*rt
;
122 struct atalk_addr
*our_addr
;
124 spin_lock(&ipddp_route_lock
);
127 * Find appropriate route to use, based only on IP number.
129 for(rt
= ipddp_route_list
; rt
!= NULL
; rt
= rt
->next
)
135 spin_unlock(&ipddp_route_lock
);
139 our_addr
= atalk_find_dev_addr(rt
->dev
);
141 if(ipddp_mode
== IPDDP_DECAP
)
143 * Pull off the excess room that should not be there.
144 * This is due to a hard-header problem. This is the
145 * quick fix for now though, till it breaks.
147 skb_pull(skb
, 35-(sizeof(struct ddpehdr
)+1));
149 /* Create the Extended DDP header */
150 ddp
= (struct ddpehdr
*)skb
->data
;
151 ddp
->deh_len_hops
= htons(skb
->len
+ (1<<10));
155 * For Localtalk we need aarp_send_ddp to strip the
156 * long DDP header and place a shot DDP header on it.
158 if(rt
->dev
->type
== ARPHRD_LOCALTLK
)
160 ddp
->deh_dnet
= 0; /* FIXME more hops?? */
165 ddp
->deh_dnet
= rt
->at
.s_net
; /* FIXME more hops?? */
166 ddp
->deh_snet
= our_addr
->s_net
;
168 ddp
->deh_dnode
= rt
->at
.s_node
;
169 ddp
->deh_snode
= our_addr
->s_node
;
173 *((__u8
*)(ddp
+1)) = 22; /* ddp type = IP */
175 skb
->protocol
= htons(ETH_P_ATALK
); /* Protocol has changed */
177 dev
->stats
.tx_packets
++;
178 dev
->stats
.tx_bytes
+= skb
->len
;
180 aarp_send_ddp(rt
->dev
, skb
, &rt
->at
, NULL
);
182 spin_unlock(&ipddp_route_lock
);
188 * Create a routing entry. We first verify that the
189 * record does not already exist. If it does we return -EEXIST
191 static int ipddp_create(struct ipddp_route
*new_rt
)
193 struct ipddp_route
*rt
= kzalloc(sizeof(*rt
), GFP_KERNEL
);
201 if ((rt
->dev
= atrtr_get_dev(&rt
->at
)) == NULL
) {
206 spin_lock_bh(&ipddp_route_lock
);
207 if (__ipddp_find_route(rt
)) {
208 spin_unlock_bh(&ipddp_route_lock
);
213 rt
->next
= ipddp_route_list
;
214 ipddp_route_list
= rt
;
216 spin_unlock_bh(&ipddp_route_lock
);
222 * Delete a route, we only delete a FULL match.
223 * If route does not exist we return -ENOENT.
225 static int ipddp_delete(struct ipddp_route
*rt
)
227 struct ipddp_route
**r
= &ipddp_route_list
;
228 struct ipddp_route
*tmp
;
230 spin_lock_bh(&ipddp_route_lock
);
231 while((tmp
= *r
) != NULL
)
233 if(tmp
->ip
== rt
->ip
&&
234 tmp
->at
.s_net
== rt
->at
.s_net
&&
235 tmp
->at
.s_node
== rt
->at
.s_node
)
238 spin_unlock_bh(&ipddp_route_lock
);
245 spin_unlock_bh(&ipddp_route_lock
);
250 * Find a routing entry, we only return a FULL match
252 static struct ipddp_route
* __ipddp_find_route(struct ipddp_route
*rt
)
254 struct ipddp_route
*f
;
256 for(f
= ipddp_route_list
; f
!= NULL
; f
= f
->next
)
258 if(f
->ip
== rt
->ip
&&
259 f
->at
.s_net
== rt
->at
.s_net
&&
260 f
->at
.s_node
== rt
->at
.s_node
)
267 static int ipddp_ioctl(struct net_device
*dev
, struct ifreq
*ifr
, int cmd
)
269 struct ipddp_route __user
*rt
= ifr
->ifr_data
;
270 struct ipddp_route rcp
, rcp2
, *rp
;
272 if(!capable(CAP_NET_ADMIN
))
275 if(copy_from_user(&rcp
, rt
, sizeof(rcp
)))
281 return ipddp_create(&rcp
);
283 case SIOCFINDIPDDPRT
:
284 spin_lock_bh(&ipddp_route_lock
);
285 rp
= __ipddp_find_route(&rcp
);
287 memcpy(&rcp2
, rp
, sizeof(rcp2
));
288 spin_unlock_bh(&ipddp_route_lock
);
291 if (copy_to_user(rt
, &rcp2
,
292 sizeof(struct ipddp_route
)))
299 return ipddp_delete(&rcp
);
306 static struct net_device
*dev_ipddp
;
308 MODULE_LICENSE("GPL");
309 module_param(ipddp_mode
, int, 0);
311 static int __init
ipddp_init_module(void)
313 dev_ipddp
= ipddp_init();
314 return PTR_ERR_OR_ZERO(dev_ipddp
);
317 static void __exit
ipddp_cleanup_module(void)
319 struct ipddp_route
*p
;
321 unregister_netdev(dev_ipddp
);
322 free_netdev(dev_ipddp
);
324 while (ipddp_route_list
) {
325 p
= ipddp_route_list
->next
;
326 kfree(ipddp_route_list
);
327 ipddp_route_list
= p
;
331 module_init(ipddp_init_module
);
332 module_exit(ipddp_cleanup_module
);