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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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070025#include <linux/fcntl.h>
26#include <linux/mm.h>
27#include <linux/interrupt.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070028#include <net/rose.h>
29
30static void rose_ftimer_expiry(unsigned long);
31static void rose_t0timer_expiry(unsigned long);
32
33static void rose_transmit_restart_confirmation(struct rose_neigh *neigh);
34static void rose_transmit_restart_request(struct rose_neigh *neigh);
35
36void rose_start_ftimer(struct rose_neigh *neigh)
37{
38 del_timer(&neigh->ftimer);
39
40 neigh->ftimer.data = (unsigned long)neigh;
41 neigh->ftimer.function = &rose_ftimer_expiry;
Ralf Baechle82e84242006-05-03 23:28:20 -070042 neigh->ftimer.expires =
43 jiffies + msecs_to_jiffies(sysctl_rose_link_fail_timeout);
Linus Torvalds1da177e2005-04-16 15:20:36 -070044
45 add_timer(&neigh->ftimer);
46}
47
48static void rose_start_t0timer(struct rose_neigh *neigh)
49{
50 del_timer(&neigh->t0timer);
51
52 neigh->t0timer.data = (unsigned long)neigh;
53 neigh->t0timer.function = &rose_t0timer_expiry;
Ralf Baechle82e84242006-05-03 23:28:20 -070054 neigh->t0timer.expires =
55 jiffies + msecs_to_jiffies(sysctl_rose_restart_request_timeout);
Linus Torvalds1da177e2005-04-16 15:20:36 -070056
57 add_timer(&neigh->t0timer);
58}
59
60void rose_stop_ftimer(struct rose_neigh *neigh)
61{
62 del_timer(&neigh->ftimer);
63}
64
65void rose_stop_t0timer(struct rose_neigh *neigh)
66{
67 del_timer(&neigh->t0timer);
68}
69
70int rose_ftimer_running(struct rose_neigh *neigh)
71{
72 return timer_pending(&neigh->ftimer);
73}
74
75static int rose_t0timer_running(struct rose_neigh *neigh)
76{
77 return timer_pending(&neigh->t0timer);
78}
79
80static void rose_ftimer_expiry(unsigned long param)
81{
82}
83
84static void rose_t0timer_expiry(unsigned long param)
85{
86 struct rose_neigh *neigh = (struct rose_neigh *)param;
87
88 rose_transmit_restart_request(neigh);
89
90 neigh->dce_mode = 0;
91
92 rose_start_t0timer(neigh);
93}
94
95/*
96 * Interface to ax25_send_frame. Changes my level 2 callsign depending
97 * on whether we have a global ROSE callsign or use the default port
98 * callsign.
99 */
100static int rose_send_frame(struct sk_buff *skb, struct rose_neigh *neigh)
101{
102 ax25_address *rose_call;
Jarek Poplawskid00c3622010-01-16 01:04:04 -0800103 ax25_cb *ax25s;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104
105 if (ax25cmp(&rose_callsign, &null_ax25_address) == 0)
106 rose_call = (ax25_address *)neigh->dev->dev_addr;
107 else
108 rose_call = &rose_callsign;
109
Jarek Poplawskid00c3622010-01-16 01:04:04 -0800110 ax25s = neigh->ax25;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111 neigh->ax25 = ax25_send_frame(skb, 260, rose_call, &neigh->callsign, neigh->digipeat, neigh->dev);
Jarek Poplawskid00c3622010-01-16 01:04:04 -0800112 if (ax25s)
113 ax25_cb_put(ax25s);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114
Eric Dumazeta02cec22010-09-22 20:43:57 +0000115 return neigh->ax25 != NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116}
117
118/*
119 * Interface to ax25_link_up. Changes my level 2 callsign depending
120 * on whether we have a global ROSE callsign or use the default port
121 * callsign.
122 */
123static int rose_link_up(struct rose_neigh *neigh)
124{
125 ax25_address *rose_call;
Jarek Poplawskid00c3622010-01-16 01:04:04 -0800126 ax25_cb *ax25s;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127
128 if (ax25cmp(&rose_callsign, &null_ax25_address) == 0)
129 rose_call = (ax25_address *)neigh->dev->dev_addr;
130 else
131 rose_call = &rose_callsign;
132
Jarek Poplawskid00c3622010-01-16 01:04:04 -0800133 ax25s = neigh->ax25;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134 neigh->ax25 = ax25_find_cb(rose_call, &neigh->callsign, neigh->digipeat, neigh->dev);
Jarek Poplawskid00c3622010-01-16 01:04:04 -0800135 if (ax25s)
136 ax25_cb_put(ax25s);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137
Eric Dumazeta02cec22010-09-22 20:43:57 +0000138 return neigh->ax25 != NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139}
140
141/*
142 * This handles all restart and diagnostic frames.
143 */
144void rose_link_rx_restart(struct sk_buff *skb, struct rose_neigh *neigh, unsigned short frametype)
145{
146 struct sk_buff *skbn;
147
148 switch (frametype) {
149 case ROSE_RESTART_REQUEST:
150 rose_stop_t0timer(neigh);
151 neigh->restarted = 1;
152 neigh->dce_mode = (skb->data[3] == ROSE_DTE_ORIGINATED);
153 rose_transmit_restart_confirmation(neigh);
154 break;
155
156 case ROSE_RESTART_CONFIRMATION:
157 rose_stop_t0timer(neigh);
158 neigh->restarted = 1;
159 break;
160
161 case ROSE_DIAGNOSTIC:
Andy Shevchenko13aa34632014-09-05 18:32:18 +0300162 pr_warn("ROSE: received diagnostic #%d - %3ph\n", skb->data[3],
163 skb->data + 4);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164 break;
165
166 default:
167 printk(KERN_WARNING "ROSE: received unknown %02X with LCI 000\n", frametype);
168 break;
169 }
170
171 if (neigh->restarted) {
172 while ((skbn = skb_dequeue(&neigh->queue)) != NULL)
173 if (!rose_send_frame(skbn, neigh))
174 kfree_skb(skbn);
175 }
176}
177
178/*
179 * This routine is called when a Restart Request is needed
180 */
181static void rose_transmit_restart_request(struct rose_neigh *neigh)
182{
183 struct sk_buff *skb;
184 unsigned char *dptr;
185 int len;
186
187 len = AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + ROSE_MIN_LEN + 3;
188
189 if ((skb = alloc_skb(len, GFP_ATOMIC)) == NULL)
190 return;
191
192 skb_reserve(skb, AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN);
193
194 dptr = skb_put(skb, ROSE_MIN_LEN + 3);
195
196 *dptr++ = AX25_P_ROSE;
197 *dptr++ = ROSE_GFI;
198 *dptr++ = 0x00;
199 *dptr++ = ROSE_RESTART_REQUEST;
200 *dptr++ = ROSE_DTE_ORIGINATED;
201 *dptr++ = 0;
202
203 if (!rose_send_frame(skb, neigh))
204 kfree_skb(skb);
205}
206
207/*
208 * This routine is called when a Restart Confirmation is needed
209 */
210static void rose_transmit_restart_confirmation(struct rose_neigh *neigh)
211{
212 struct sk_buff *skb;
213 unsigned char *dptr;
214 int len;
215
216 len = AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + ROSE_MIN_LEN + 1;
217
218 if ((skb = alloc_skb(len, GFP_ATOMIC)) == NULL)
219 return;
220
221 skb_reserve(skb, AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN);
222
223 dptr = skb_put(skb, ROSE_MIN_LEN + 1);
224
225 *dptr++ = AX25_P_ROSE;
226 *dptr++ = ROSE_GFI;
227 *dptr++ = 0x00;
228 *dptr++ = ROSE_RESTART_CONFIRMATION;
229
230 if (!rose_send_frame(skb, neigh))
231 kfree_skb(skb);
232}
233
234/*
235 * This routine is called when a Clear Request is needed outside of the context
236 * of a connected socket.
237 */
238void rose_transmit_clear_request(struct rose_neigh *neigh, unsigned int lci, unsigned char cause, unsigned char diagnostic)
239{
240 struct sk_buff *skb;
241 unsigned char *dptr;
242 int len;
243
244 len = AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + ROSE_MIN_LEN + 3;
245
246 if ((skb = alloc_skb(len, GFP_ATOMIC)) == NULL)
247 return;
248
249 skb_reserve(skb, AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN);
250
251 dptr = skb_put(skb, ROSE_MIN_LEN + 3);
252
253 *dptr++ = AX25_P_ROSE;
254 *dptr++ = ((lci >> 8) & 0x0F) | ROSE_GFI;
255 *dptr++ = ((lci >> 0) & 0xFF);
256 *dptr++ = ROSE_CLEAR_REQUEST;
257 *dptr++ = cause;
258 *dptr++ = diagnostic;
259
260 if (!rose_send_frame(skb, neigh))
261 kfree_skb(skb);
262}
263
264void rose_transmit_link(struct sk_buff *skb, struct rose_neigh *neigh)
265{
266 unsigned char *dptr;
267
Linus Torvalds1da177e2005-04-16 15:20:36 -0700268 if (neigh->loopback) {
269 rose_loopback_queue(skb, neigh);
270 return;
271 }
272
273 if (!rose_link_up(neigh))
274 neigh->restarted = 0;
275
276 dptr = skb_push(skb, 1);
277 *dptr++ = AX25_P_ROSE;
278
279 if (neigh->restarted) {
280 if (!rose_send_frame(skb, neigh))
281 kfree_skb(skb);
282 } else {
283 skb_queue_tail(&neigh->queue, skb);
284
285 if (!rose_t0timer_running(neigh)) {
286 rose_transmit_restart_request(neigh);
287 neigh->dce_mode = 0;
288 rose_start_t0timer(neigh);
289 }
290 }
291}