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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 | ||
26 | #include <linux/config.h> | |
27 | #include <linux/module.h> | |
28 | #include <linux/kernel.h> | |
29 | #include <linux/init.h> | |
30 | #include <linux/netdevice.h> | |
31 | #include <linux/etherdevice.h> | |
32 | #include <linux/ip.h> | |
33 | #include <linux/atalk.h> | |
34 | #include <linux/if_arp.h> | |
35 | #include <net/route.h> | |
36 | #include <asm/uaccess.h> | |
37 | ||
38 | #include "ipddp.h" /* Our stuff */ | |
39 | ||
40 | static const char version[] = KERN_INFO "ipddp.c:v0.01 8/28/97 Bradford W. Johnson <johns393@maroon.tc.umn.edu>\n"; | |
41 | ||
42 | static struct ipddp_route *ipddp_route_list; | |
43 | ||
44 | #ifdef CONFIG_IPDDP_ENCAP | |
45 | static int ipddp_mode = IPDDP_ENCAP; | |
46 | #else | |
47 | static int ipddp_mode = IPDDP_DECAP; | |
48 | #endif | |
49 | ||
50 | /* Index to functions, as function prototypes. */ | |
51 | static int ipddp_xmit(struct sk_buff *skb, struct net_device *dev); | |
52 | static struct net_device_stats *ipddp_get_stats(struct net_device *dev); | |
53 | static int ipddp_create(struct ipddp_route *new_rt); | |
54 | static int ipddp_delete(struct ipddp_route *rt); | |
55 | static struct ipddp_route* ipddp_find_route(struct ipddp_route *rt); | |
56 | static int ipddp_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd); | |
57 | ||
58 | ||
59 | static struct net_device * __init ipddp_init(void) | |
60 | { | |
61 | static unsigned version_printed; | |
62 | struct net_device *dev; | |
63 | int err; | |
64 | ||
65 | dev = alloc_etherdev(sizeof(struct net_device_stats)); | |
66 | if (!dev) | |
67 | return ERR_PTR(-ENOMEM); | |
68 | ||
69 | SET_MODULE_OWNER(dev); | |
70 | strcpy(dev->name, "ipddp%d"); | |
71 | ||
72 | if (version_printed++ == 0) | |
73 | printk(version); | |
74 | ||
75 | /* Initalize the device structure. */ | |
76 | dev->hard_start_xmit = ipddp_xmit; | |
77 | dev->get_stats = ipddp_get_stats; | |
78 | dev->do_ioctl = ipddp_ioctl; | |
79 | ||
80 | dev->type = ARPHRD_IPDDP; /* IP over DDP tunnel */ | |
81 | dev->mtu = 585; | |
82 | dev->flags |= IFF_NOARP; | |
83 | ||
84 | /* | |
85 | * The worst case header we will need is currently a | |
86 | * ethernet header (14 bytes) and a ddp header (sizeof ddpehdr+1) | |
87 | * We send over SNAP so that takes another 8 bytes. | |
88 | */ | |
89 | dev->hard_header_len = 14+8+sizeof(struct ddpehdr)+1; | |
90 | ||
91 | err = register_netdev(dev); | |
92 | if (err) { | |
93 | free_netdev(dev); | |
94 | return ERR_PTR(err); | |
95 | } | |
96 | ||
97 | /* Let the user now what mode we are in */ | |
98 | if(ipddp_mode == IPDDP_ENCAP) | |
99 | printk("%s: Appletalk-IP Encap. mode by Bradford W. Johnson <johns393@maroon.tc.umn.edu>\n", | |
100 | dev->name); | |
101 | if(ipddp_mode == IPDDP_DECAP) | |
102 | printk("%s: Appletalk-IP Decap. mode by Jay Schulist <jschlst@samba.org>\n", | |
103 | dev->name); | |
104 | ||
105 | return dev; | |
106 | } | |
107 | ||
108 | /* | |
109 | * Get the current statistics. This may be called with the card open or closed. | |
110 | */ | |
111 | static struct net_device_stats *ipddp_get_stats(struct net_device *dev) | |
112 | { | |
113 | return dev->priv; | |
114 | } | |
115 | ||
116 | /* | |
117 | * Transmit LLAP/ELAP frame using aarp_send_ddp. | |
118 | */ | |
119 | static int ipddp_xmit(struct sk_buff *skb, struct net_device *dev) | |
120 | { | |
121 | u32 paddr = ((struct rtable*)skb->dst)->rt_gateway; | |
122 | struct ddpehdr *ddp; | |
123 | struct ipddp_route *rt; | |
124 | struct atalk_addr *our_addr; | |
125 | ||
126 | /* | |
127 | * Find appropriate route to use, based only on IP number. | |
128 | */ | |
129 | for(rt = ipddp_route_list; rt != NULL; rt = rt->next) | |
130 | { | |
131 | if(rt->ip == paddr) | |
132 | break; | |
133 | } | |
134 | if(rt == NULL) | |
135 | return 0; | |
136 | ||
137 | our_addr = atalk_find_dev_addr(rt->dev); | |
138 | ||
139 | if(ipddp_mode == IPDDP_DECAP) | |
140 | /* | |
141 | * Pull off the excess room that should not be there. | |
142 | * This is due to a hard-header problem. This is the | |
143 | * quick fix for now though, till it breaks. | |
144 | */ | |
145 | skb_pull(skb, 35-(sizeof(struct ddpehdr)+1)); | |
146 | ||
147 | /* Create the Extended DDP header */ | |
148 | ddp = (struct ddpehdr *)skb->data; | |
149 | ddp->deh_len = skb->len; | |
150 | ddp->deh_hops = 1; | |
151 | ddp->deh_pad = 0; | |
152 | ddp->deh_sum = 0; | |
153 | ||
154 | /* | |
155 | * For Localtalk we need aarp_send_ddp to strip the | |
156 | * long DDP header and place a shot DDP header on it. | |
157 | */ | |
158 | if(rt->dev->type == ARPHRD_LOCALTLK) | |
159 | { | |
160 | ddp->deh_dnet = 0; /* FIXME more hops?? */ | |
161 | ddp->deh_snet = 0; | |
162 | } | |
163 | else | |
164 | { | |
165 | ddp->deh_dnet = rt->at.s_net; /* FIXME more hops?? */ | |
166 | ddp->deh_snet = our_addr->s_net; | |
167 | } | |
168 | ddp->deh_dnode = rt->at.s_node; | |
169 | ddp->deh_snode = our_addr->s_node; | |
170 | ddp->deh_dport = 72; | |
171 | ddp->deh_sport = 72; | |
172 | ||
173 | *((__u8 *)(ddp+1)) = 22; /* ddp type = IP */ | |
174 | *((__u16 *)ddp)=ntohs(*((__u16 *)ddp)); /* fix up length field */ | |
175 | ||
176 | skb->protocol = htons(ETH_P_ATALK); /* Protocol has changed */ | |
177 | ||
178 | ((struct net_device_stats *) dev->priv)->tx_packets++; | |
179 | ((struct net_device_stats *) dev->priv)->tx_bytes+=skb->len; | |
180 | ||
181 | if(aarp_send_ddp(rt->dev, skb, &rt->at, NULL) < 0) | |
182 | dev_kfree_skb(skb); | |
183 | ||
184 | return 0; | |
185 | } | |
186 | ||
187 | /* | |
188 | * Create a routing entry. We first verify that the | |
189 | * record does not already exist. If it does we return -EEXIST | |
190 | */ | |
191 | static int ipddp_create(struct ipddp_route *new_rt) | |
192 | { | |
193 | struct ipddp_route *rt =(struct ipddp_route*) kmalloc(sizeof(*rt), GFP_KERNEL); | |
194 | ||
195 | if (rt == NULL) | |
196 | return -ENOMEM; | |
197 | ||
198 | rt->ip = new_rt->ip; | |
199 | rt->at = new_rt->at; | |
200 | rt->next = NULL; | |
201 | if ((rt->dev = atrtr_get_dev(&rt->at)) == NULL) { | |
202 | kfree(rt); | |
203 | return -ENETUNREACH; | |
204 | } | |
205 | ||
206 | if (ipddp_find_route(rt)) { | |
207 | kfree(rt); | |
208 | return -EEXIST; | |
209 | } | |
210 | ||
211 | rt->next = ipddp_route_list; | |
212 | ipddp_route_list = rt; | |
213 | ||
214 | return 0; | |
215 | } | |
216 | ||
217 | /* | |
218 | * Delete a route, we only delete a FULL match. | |
219 | * If route does not exist we return -ENOENT. | |
220 | */ | |
221 | static int ipddp_delete(struct ipddp_route *rt) | |
222 | { | |
223 | struct ipddp_route **r = &ipddp_route_list; | |
224 | struct ipddp_route *tmp; | |
225 | ||
226 | while((tmp = *r) != NULL) | |
227 | { | |
228 | if(tmp->ip == rt->ip | |
229 | && tmp->at.s_net == rt->at.s_net | |
230 | && tmp->at.s_node == rt->at.s_node) | |
231 | { | |
232 | *r = tmp->next; | |
233 | kfree(tmp); | |
234 | return 0; | |
235 | } | |
236 | r = &tmp->next; | |
237 | } | |
238 | ||
239 | return (-ENOENT); | |
240 | } | |
241 | ||
242 | /* | |
243 | * Find a routing entry, we only return a FULL match | |
244 | */ | |
245 | static struct ipddp_route* ipddp_find_route(struct ipddp_route *rt) | |
246 | { | |
247 | struct ipddp_route *f; | |
248 | ||
249 | for(f = ipddp_route_list; f != NULL; f = f->next) | |
250 | { | |
251 | if(f->ip == rt->ip | |
252 | && f->at.s_net == rt->at.s_net | |
253 | && f->at.s_node == rt->at.s_node) | |
254 | return (f); | |
255 | } | |
256 | ||
257 | return (NULL); | |
258 | } | |
259 | ||
260 | static int ipddp_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) | |
261 | { | |
262 | struct ipddp_route __user *rt = ifr->ifr_data; | |
263 | struct ipddp_route rcp; | |
264 | ||
265 | if(!capable(CAP_NET_ADMIN)) | |
266 | return -EPERM; | |
267 | ||
268 | if(copy_from_user(&rcp, rt, sizeof(rcp))) | |
269 | return -EFAULT; | |
270 | ||
271 | switch(cmd) | |
272 | { | |
273 | case SIOCADDIPDDPRT: | |
274 | return (ipddp_create(&rcp)); | |
275 | ||
276 | case SIOCFINDIPDDPRT: | |
277 | if(copy_to_user(rt, ipddp_find_route(&rcp), sizeof(struct ipddp_route))) | |
278 | return -EFAULT; | |
279 | return 0; | |
280 | ||
281 | case SIOCDELIPDDPRT: | |
282 | return (ipddp_delete(&rcp)); | |
283 | ||
284 | default: | |
285 | return -EINVAL; | |
286 | } | |
287 | } | |
288 | ||
289 | static struct net_device *dev_ipddp; | |
290 | ||
291 | MODULE_LICENSE("GPL"); | |
292 | module_param(ipddp_mode, int, 0); | |
293 | ||
294 | static int __init ipddp_init_module(void) | |
295 | { | |
296 | dev_ipddp = ipddp_init(); | |
297 | if (IS_ERR(dev_ipddp)) | |
298 | return PTR_ERR(dev_ipddp); | |
299 | return 0; | |
300 | } | |
301 | ||
302 | static void __exit ipddp_cleanup_module(void) | |
303 | { | |
304 | struct ipddp_route *p; | |
305 | ||
306 | unregister_netdev(dev_ipddp); | |
307 | free_netdev(dev_ipddp); | |
308 | ||
309 | while (ipddp_route_list) { | |
310 | p = ipddp_route_list->next; | |
311 | kfree(ipddp_route_list); | |
312 | ipddp_route_list = p; | |
313 | } | |
314 | } | |
315 | ||
316 | module_init(ipddp_init_module); | |
317 | module_exit(ipddp_cleanup_module); |