1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
|
/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
*/
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/socket.h>
#include <linux/in.h>
#include <linux/kernel.h>
#include <linux/jiffies.h>
#include <linux/timer.h>
#include <linux/string.h>
#include <linux/sockios.h>
#include <linux/net.h>
#include <net/ax25.h>
#include <linux/inet.h>
#include <linux/netdevice.h>
#include <linux/skbuff.h>
#include <net/sock.h>
#include <asm/system.h>
#include <linux/fcntl.h>
#include <linux/mm.h>
#include <linux/interrupt.h>
#include <linux/netfilter.h>
#include <net/rose.h>
static void rose_ftimer_expiry(unsigned long);
static void rose_t0timer_expiry(unsigned long);
static void rose_transmit_restart_confirmation(struct rose_neigh *neigh);
static void rose_transmit_restart_request(struct rose_neigh *neigh);
void rose_start_ftimer(struct rose_neigh *neigh)
{
del_timer(&neigh->ftimer);
neigh->ftimer.data = (unsigned long)neigh;
neigh->ftimer.function = &rose_ftimer_expiry;
neigh->ftimer.expires = jiffies + sysctl_rose_link_fail_timeout;
add_timer(&neigh->ftimer);
}
static void rose_start_t0timer(struct rose_neigh *neigh)
{
del_timer(&neigh->t0timer);
neigh->t0timer.data = (unsigned long)neigh;
neigh->t0timer.function = &rose_t0timer_expiry;
neigh->t0timer.expires = jiffies + sysctl_rose_restart_request_timeout;
add_timer(&neigh->t0timer);
}
void rose_stop_ftimer(struct rose_neigh *neigh)
{
del_timer(&neigh->ftimer);
}
void rose_stop_t0timer(struct rose_neigh *neigh)
{
del_timer(&neigh->t0timer);
}
int rose_ftimer_running(struct rose_neigh *neigh)
{
return timer_pending(&neigh->ftimer);
}
static int rose_t0timer_running(struct rose_neigh *neigh)
{
return timer_pending(&neigh->t0timer);
}
static void rose_ftimer_expiry(unsigned long param)
{
}
static void rose_t0timer_expiry(unsigned long param)
{
struct rose_neigh *neigh = (struct rose_neigh *)param;
rose_transmit_restart_request(neigh);
neigh->dce_mode = 0;
rose_start_t0timer(neigh);
}
/*
* Interface to ax25_send_frame. Changes my level 2 callsign depending
* on whether we have a global ROSE callsign or use the default port
* callsign.
*/
static int rose_send_frame(struct sk_buff *skb, struct rose_neigh *neigh)
{
ax25_address *rose_call;
if (ax25cmp(&rose_callsign, &null_ax25_address) == 0)
rose_call = (ax25_address *)neigh->dev->dev_addr;
else
rose_call = &rose_callsign;
neigh->ax25 = ax25_send_frame(skb, 260, rose_call, &neigh->callsign, neigh->digipeat, neigh->dev);
return (neigh->ax25 != NULL);
}
/*
* Interface to ax25_link_up. Changes my level 2 callsign depending
* on whether we have a global ROSE callsign or use the default port
* callsign.
*/
static int rose_link_up(struct rose_neigh *neigh)
{
ax25_address *rose_call;
if (ax25cmp(&rose_callsign, &null_ax25_address) == 0)
rose_call = (ax25_address *)neigh->dev->dev_addr;
else
rose_call = &rose_callsign;
neigh->ax25 = ax25_find_cb(rose_call, &neigh->callsign, neigh->digipeat, neigh->dev);
return (neigh->ax25 != NULL);
}
/*
* This handles all restart and diagnostic frames.
*/
void rose_link_rx_restart(struct sk_buff *skb, struct rose_neigh *neigh, unsigned short frametype)
{
struct sk_buff *skbn;
switch (frametype) {
case ROSE_RESTART_REQUEST:
rose_stop_t0timer(neigh);
neigh->restarted = 1;
neigh->dce_mode = (skb->data[3] == ROSE_DTE_ORIGINATED);
rose_transmit_restart_confirmation(neigh);
break;
case ROSE_RESTART_CONFIRMATION:
rose_stop_t0timer(neigh);
neigh->restarted = 1;
break;
case ROSE_DIAGNOSTIC:
printk(KERN_WARNING "ROSE: received diagnostic #%d - %02X %02X %02X\n", skb->data[3], skb->data[4], skb->data[5], skb->data[6]);
break;
default:
printk(KERN_WARNING "ROSE: received unknown %02X with LCI 000\n", frametype);
break;
}
if (neigh->restarted) {
while ((skbn = skb_dequeue(&neigh->queue)) != NULL)
if (!rose_send_frame(skbn, neigh))
kfree_skb(skbn);
}
}
/*
* This routine is called when a Restart Request is needed
*/
static void rose_transmit_restart_request(struct rose_neigh *neigh)
{
struct sk_buff *skb;
unsigned char *dptr;
int len;
len = AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + ROSE_MIN_LEN + 3;
if ((skb = alloc_skb(len, GFP_ATOMIC)) == NULL)
return;
skb_reserve(skb, AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN);
dptr = skb_put(skb, ROSE_MIN_LEN + 3);
*dptr++ = AX25_P_ROSE;
*dptr++ = ROSE_GFI;
*dptr++ = 0x00;
*dptr++ = ROSE_RESTART_REQUEST;
*dptr++ = ROSE_DTE_ORIGINATED;
*dptr++ = 0;
if (!rose_send_frame(skb, neigh))
kfree_skb(skb);
}
/*
* This routine is called when a Restart Confirmation is needed
*/
static void rose_transmit_restart_confirmation(struct rose_neigh *neigh)
{
struct sk_buff *skb;
unsigned char *dptr;
int len;
len = AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + ROSE_MIN_LEN + 1;
if ((skb = alloc_skb(len, GFP_ATOMIC)) == NULL)
return;
skb_reserve(skb, AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN);
dptr = skb_put(skb, ROSE_MIN_LEN + 1);
*dptr++ = AX25_P_ROSE;
*dptr++ = ROSE_GFI;
*dptr++ = 0x00;
*dptr++ = ROSE_RESTART_CONFIRMATION;
if (!rose_send_frame(skb, neigh))
kfree_skb(skb);
}
/*
* This routine is called when a Clear Request is needed outside of the context
* of a connected socket.
*/
void rose_transmit_clear_request(struct rose_neigh *neigh, unsigned int lci, unsigned char cause, unsigned char diagnostic)
{
struct sk_buff *skb;
unsigned char *dptr;
int len;
len = AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + ROSE_MIN_LEN + 3;
if ((skb = alloc_skb(len, GFP_ATOMIC)) == NULL)
return;
skb_reserve(skb, AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN);
dptr = skb_put(skb, ROSE_MIN_LEN + 3);
*dptr++ = AX25_P_ROSE;
*dptr++ = ((lci >> 8) & 0x0F) | ROSE_GFI;
*dptr++ = ((lci >> 0) & 0xFF);
*dptr++ = ROSE_CLEAR_REQUEST;
*dptr++ = cause;
*dptr++ = diagnostic;
if (!rose_send_frame(skb, neigh))
kfree_skb(skb);
}
void rose_transmit_link(struct sk_buff *skb, struct rose_neigh *neigh)
{
unsigned char *dptr;
#if 0
if (call_fw_firewall(PF_ROSE, skb->dev, skb->data, NULL, &skb) != FW_ACCEPT) {
kfree_skb(skb);
return;
}
#endif
if (neigh->loopback) {
rose_loopback_queue(skb, neigh);
return;
}
if (!rose_link_up(neigh))
neigh->restarted = 0;
dptr = skb_push(skb, 1);
*dptr++ = AX25_P_ROSE;
if (neigh->restarted) {
if (!rose_send_frame(skb, neigh))
kfree_skb(skb);
} else {
skb_queue_tail(&neigh->queue, skb);
if (!rose_t0timer_running(neigh)) {
rose_transmit_restart_request(neigh);
neigh->dce_mode = 0;
rose_start_t0timer(neigh);
}
}
}
|
