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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * This program is free software; you can redistribute it and/or modify
3 * it under the terms of the GNU General Public License as published by
4 * the Free Software Foundation; either version 2 of the License, or
5 * (at your option) any later version.
6 *
7 * Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
8 */
9#include <linux/errno.h>
10#include <linux/types.h>
11#include <linux/socket.h>
12#include <linux/in.h>
13#include <linux/kernel.h>
14#include <linux/jiffies.h>
15#include <linux/timer.h>
16#include <linux/string.h>
17#include <linux/sockios.h>
18#include <linux/net.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090019#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070020#include <net/ax25.h>
21#include <linux/inet.h>
22#include <linux/netdevice.h>
23#include <linux/skbuff.h>
24#include <net/sock.h>
25#include <asm/system.h>
26#include <linux/fcntl.h>
27#include <linux/mm.h>
28#include <linux/interrupt.h>
29#include <linux/netfilter.h>
30#include <net/rose.h>
31
32static void rose_ftimer_expiry(unsigned long);
33static void rose_t0timer_expiry(unsigned long);
34
35static void rose_transmit_restart_confirmation(struct rose_neigh *neigh);
36static void rose_transmit_restart_request(struct rose_neigh *neigh);
37
38void rose_start_ftimer(struct rose_neigh *neigh)
39{
40 del_timer(&neigh->ftimer);
41
42 neigh->ftimer.data = (unsigned long)neigh;
43 neigh->ftimer.function = &rose_ftimer_expiry;
Ralf Baechle82e84242006-05-03 23:28:20 -070044 neigh->ftimer.expires =
45 jiffies + msecs_to_jiffies(sysctl_rose_link_fail_timeout);
Linus Torvalds1da177e2005-04-16 15:20:36 -070046
47 add_timer(&neigh->ftimer);
48}
49
50static void rose_start_t0timer(struct rose_neigh *neigh)
51{
52 del_timer(&neigh->t0timer);
53
54 neigh->t0timer.data = (unsigned long)neigh;
55 neigh->t0timer.function = &rose_t0timer_expiry;
Ralf Baechle82e84242006-05-03 23:28:20 -070056 neigh->t0timer.expires =
57 jiffies + msecs_to_jiffies(sysctl_rose_restart_request_timeout);
Linus Torvalds1da177e2005-04-16 15:20:36 -070058
59 add_timer(&neigh->t0timer);
60}
61
62void rose_stop_ftimer(struct rose_neigh *neigh)
63{
64 del_timer(&neigh->ftimer);
65}
66
67void rose_stop_t0timer(struct rose_neigh *neigh)
68{
69 del_timer(&neigh->t0timer);
70}
71
72int rose_ftimer_running(struct rose_neigh *neigh)
73{
74 return timer_pending(&neigh->ftimer);
75}
76
77static int rose_t0timer_running(struct rose_neigh *neigh)
78{
79 return timer_pending(&neigh->t0timer);
80}
81
82static void rose_ftimer_expiry(unsigned long param)
83{
84}
85
86static void rose_t0timer_expiry(unsigned long param)
87{
88 struct rose_neigh *neigh = (struct rose_neigh *)param;
89
90 rose_transmit_restart_request(neigh);
91
92 neigh->dce_mode = 0;
93
94 rose_start_t0timer(neigh);
95}
96
97/*
98 * Interface to ax25_send_frame. Changes my level 2 callsign depending
99 * on whether we have a global ROSE callsign or use the default port
100 * callsign.
101 */
102static int rose_send_frame(struct sk_buff *skb, struct rose_neigh *neigh)
103{
104 ax25_address *rose_call;
Jarek Poplawskid00c3622010-01-16 01:04:04 -0800105 ax25_cb *ax25s;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106
107 if (ax25cmp(&rose_callsign, &null_ax25_address) == 0)
108 rose_call = (ax25_address *)neigh->dev->dev_addr;
109 else
110 rose_call = &rose_callsign;
111
Jarek Poplawskid00c3622010-01-16 01:04:04 -0800112 ax25s = neigh->ax25;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113 neigh->ax25 = ax25_send_frame(skb, 260, rose_call, &neigh->callsign, neigh->digipeat, neigh->dev);
Jarek Poplawskid00c3622010-01-16 01:04:04 -0800114 if (ax25s)
115 ax25_cb_put(ax25s);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116
Eric Dumazeta02cec22010-09-22 20:43:57 +0000117 return neigh->ax25 != NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118}
119
120/*
121 * Interface to ax25_link_up. Changes my level 2 callsign depending
122 * on whether we have a global ROSE callsign or use the default port
123 * callsign.
124 */
125static int rose_link_up(struct rose_neigh *neigh)
126{
127 ax25_address *rose_call;
Jarek Poplawskid00c3622010-01-16 01:04:04 -0800128 ax25_cb *ax25s;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129
130 if (ax25cmp(&rose_callsign, &null_ax25_address) == 0)
131 rose_call = (ax25_address *)neigh->dev->dev_addr;
132 else
133 rose_call = &rose_callsign;
134
Jarek Poplawskid00c3622010-01-16 01:04:04 -0800135 ax25s = neigh->ax25;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136 neigh->ax25 = ax25_find_cb(rose_call, &neigh->callsign, neigh->digipeat, neigh->dev);
Jarek Poplawskid00c3622010-01-16 01:04:04 -0800137 if (ax25s)
138 ax25_cb_put(ax25s);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139
Eric Dumazeta02cec22010-09-22 20:43:57 +0000140 return neigh->ax25 != NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141}
142
143/*
144 * This handles all restart and diagnostic frames.
145 */
146void rose_link_rx_restart(struct sk_buff *skb, struct rose_neigh *neigh, unsigned short frametype)
147{
148 struct sk_buff *skbn;
149
150 switch (frametype) {
151 case ROSE_RESTART_REQUEST:
152 rose_stop_t0timer(neigh);
153 neigh->restarted = 1;
154 neigh->dce_mode = (skb->data[3] == ROSE_DTE_ORIGINATED);
155 rose_transmit_restart_confirmation(neigh);
156 break;
157
158 case ROSE_RESTART_CONFIRMATION:
159 rose_stop_t0timer(neigh);
160 neigh->restarted = 1;
161 break;
162
163 case ROSE_DIAGNOSTIC:
164 printk(KERN_WARNING "ROSE: received diagnostic #%d - %02X %02X %02X\n", skb->data[3], skb->data[4], skb->data[5], skb->data[6]);
165 break;
166
167 default:
168 printk(KERN_WARNING "ROSE: received unknown %02X with LCI 000\n", frametype);
169 break;
170 }
171
172 if (neigh->restarted) {
173 while ((skbn = skb_dequeue(&neigh->queue)) != NULL)
174 if (!rose_send_frame(skbn, neigh))
175 kfree_skb(skbn);
176 }
177}
178
179/*
180 * This routine is called when a Restart Request is needed
181 */
182static void rose_transmit_restart_request(struct rose_neigh *neigh)
183{
184 struct sk_buff *skb;
185 unsigned char *dptr;
186 int len;
187
188 len = AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + ROSE_MIN_LEN + 3;
189
190 if ((skb = alloc_skb(len, GFP_ATOMIC)) == NULL)
191 return;
192
193 skb_reserve(skb, AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN);
194
195 dptr = skb_put(skb, ROSE_MIN_LEN + 3);
196
197 *dptr++ = AX25_P_ROSE;
198 *dptr++ = ROSE_GFI;
199 *dptr++ = 0x00;
200 *dptr++ = ROSE_RESTART_REQUEST;
201 *dptr++ = ROSE_DTE_ORIGINATED;
202 *dptr++ = 0;
203
204 if (!rose_send_frame(skb, neigh))
205 kfree_skb(skb);
206}
207
208/*
209 * This routine is called when a Restart Confirmation is needed
210 */
211static void rose_transmit_restart_confirmation(struct rose_neigh *neigh)
212{
213 struct sk_buff *skb;
214 unsigned char *dptr;
215 int len;
216
217 len = AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + ROSE_MIN_LEN + 1;
218
219 if ((skb = alloc_skb(len, GFP_ATOMIC)) == NULL)
220 return;
221
222 skb_reserve(skb, AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN);
223
224 dptr = skb_put(skb, ROSE_MIN_LEN + 1);
225
226 *dptr++ = AX25_P_ROSE;
227 *dptr++ = ROSE_GFI;
228 *dptr++ = 0x00;
229 *dptr++ = ROSE_RESTART_CONFIRMATION;
230
231 if (!rose_send_frame(skb, neigh))
232 kfree_skb(skb);
233}
234
235/*
236 * This routine is called when a Clear Request is needed outside of the context
237 * of a connected socket.
238 */
239void rose_transmit_clear_request(struct rose_neigh *neigh, unsigned int lci, unsigned char cause, unsigned char diagnostic)
240{
241 struct sk_buff *skb;
242 unsigned char *dptr;
243 int len;
244
245 len = AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + ROSE_MIN_LEN + 3;
246
247 if ((skb = alloc_skb(len, GFP_ATOMIC)) == NULL)
248 return;
249
250 skb_reserve(skb, AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN);
251
252 dptr = skb_put(skb, ROSE_MIN_LEN + 3);
253
254 *dptr++ = AX25_P_ROSE;
255 *dptr++ = ((lci >> 8) & 0x0F) | ROSE_GFI;
256 *dptr++ = ((lci >> 0) & 0xFF);
257 *dptr++ = ROSE_CLEAR_REQUEST;
258 *dptr++ = cause;
259 *dptr++ = diagnostic;
260
261 if (!rose_send_frame(skb, neigh))
262 kfree_skb(skb);
263}
264
265void rose_transmit_link(struct sk_buff *skb, struct rose_neigh *neigh)
266{
267 unsigned char *dptr;
268
269#if 0
270 if (call_fw_firewall(PF_ROSE, skb->dev, skb->data, NULL, &skb) != FW_ACCEPT) {
271 kfree_skb(skb);
272 return;
273 }
274#endif
275
276 if (neigh->loopback) {
277 rose_loopback_queue(skb, neigh);
278 return;
279 }
280
281 if (!rose_link_up(neigh))
282 neigh->restarted = 0;
283
284 dptr = skb_push(skb, 1);
285 *dptr++ = AX25_P_ROSE;
286
287 if (neigh->restarted) {
288 if (!rose_send_frame(skb, neigh))
289 kfree_skb(skb);
290 } else {
291 skb_queue_tail(&neigh->queue, skb);
292
293 if (!rose_t0timer_running(neigh)) {
294 rose_transmit_restart_request(neigh);
295 neigh->dce_mode = 0;
296 rose_start_t0timer(neigh);
297 }
298 }
299}