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.
7 * Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
9 #include <linux/errno.h>
10 #include <linux/types.h>
11 #include <linux/socket.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>
20 #include <linux/inet.h>
21 #include <linux/netdevice.h>
22 #include <linux/skbuff.h>
24 #include <asm/system.h>
25 #include <linux/fcntl.h>
27 #include <linux/interrupt.h>
28 #include <linux/netfilter.h>
31 static void rose_ftimer_expiry(unsigned long);
32 static void rose_t0timer_expiry(unsigned long);
34 void rose_start_ftimer(struct rose_neigh
*neigh
)
36 del_timer(&neigh
->ftimer
);
38 neigh
->ftimer
.data
= (unsigned long)neigh
;
39 neigh
->ftimer
.function
= &rose_ftimer_expiry
;
40 neigh
->ftimer
.expires
= jiffies
+ sysctl_rose_link_fail_timeout
;
42 add_timer(&neigh
->ftimer
);
45 void rose_start_t0timer(struct rose_neigh
*neigh
)
47 del_timer(&neigh
->t0timer
);
49 neigh
->t0timer
.data
= (unsigned long)neigh
;
50 neigh
->t0timer
.function
= &rose_t0timer_expiry
;
51 neigh
->t0timer
.expires
= jiffies
+ sysctl_rose_restart_request_timeout
;
53 add_timer(&neigh
->t0timer
);
56 void rose_stop_ftimer(struct rose_neigh
*neigh
)
58 del_timer(&neigh
->ftimer
);
61 void rose_stop_t0timer(struct rose_neigh
*neigh
)
63 del_timer(&neigh
->t0timer
);
66 int rose_ftimer_running(struct rose_neigh
*neigh
)
68 return timer_pending(&neigh
->ftimer
);
71 int rose_t0timer_running(struct rose_neigh
*neigh
)
73 return timer_pending(&neigh
->t0timer
);
76 static void rose_ftimer_expiry(unsigned long param
)
80 static void rose_t0timer_expiry(unsigned long param
)
82 struct rose_neigh
*neigh
= (struct rose_neigh
*)param
;
84 rose_transmit_restart_request(neigh
);
88 rose_start_t0timer(neigh
);
92 * Interface to ax25_send_frame. Changes my level 2 callsign depending
93 * on whether we have a global ROSE callsign or use the default port
96 static int rose_send_frame(struct sk_buff
*skb
, struct rose_neigh
*neigh
)
98 ax25_address
*rose_call
;
100 if (ax25cmp(&rose_callsign
, &null_ax25_address
) == 0)
101 rose_call
= (ax25_address
*)neigh
->dev
->dev_addr
;
103 rose_call
= &rose_callsign
;
105 neigh
->ax25
= ax25_send_frame(skb
, 260, rose_call
, &neigh
->callsign
, neigh
->digipeat
, neigh
->dev
);
107 return (neigh
->ax25
!= NULL
);
111 * Interface to ax25_link_up. Changes my level 2 callsign depending
112 * on whether we have a global ROSE callsign or use the default port
115 static int rose_link_up(struct rose_neigh
*neigh
)
117 ax25_address
*rose_call
;
119 if (ax25cmp(&rose_callsign
, &null_ax25_address
) == 0)
120 rose_call
= (ax25_address
*)neigh
->dev
->dev_addr
;
122 rose_call
= &rose_callsign
;
124 neigh
->ax25
= ax25_find_cb(rose_call
, &neigh
->callsign
, neigh
->digipeat
, neigh
->dev
);
126 return (neigh
->ax25
!= NULL
);
130 * This handles all restart and diagnostic frames.
132 void rose_link_rx_restart(struct sk_buff
*skb
, struct rose_neigh
*neigh
, unsigned short frametype
)
134 struct sk_buff
*skbn
;
137 case ROSE_RESTART_REQUEST
:
138 rose_stop_t0timer(neigh
);
139 neigh
->restarted
= 1;
140 neigh
->dce_mode
= (skb
->data
[3] == ROSE_DTE_ORIGINATED
);
141 rose_transmit_restart_confirmation(neigh
);
144 case ROSE_RESTART_CONFIRMATION
:
145 rose_stop_t0timer(neigh
);
146 neigh
->restarted
= 1;
149 case ROSE_DIAGNOSTIC
:
150 printk(KERN_WARNING
"ROSE: received diagnostic #%d - %02X %02X %02X\n", skb
->data
[3], skb
->data
[4], skb
->data
[5], skb
->data
[6]);
154 printk(KERN_WARNING
"ROSE: received unknown %02X with LCI 000\n", frametype
);
158 if (neigh
->restarted
) {
159 while ((skbn
= skb_dequeue(&neigh
->queue
)) != NULL
)
160 if (!rose_send_frame(skbn
, neigh
))
166 * This routine is called when a Restart Request is needed
168 void rose_transmit_restart_request(struct rose_neigh
*neigh
)
174 len
= AX25_BPQ_HEADER_LEN
+ AX25_MAX_HEADER_LEN
+ ROSE_MIN_LEN
+ 3;
176 if ((skb
= alloc_skb(len
, GFP_ATOMIC
)) == NULL
)
179 skb_reserve(skb
, AX25_BPQ_HEADER_LEN
+ AX25_MAX_HEADER_LEN
);
181 dptr
= skb_put(skb
, ROSE_MIN_LEN
+ 3);
183 *dptr
++ = AX25_P_ROSE
;
186 *dptr
++ = ROSE_RESTART_REQUEST
;
187 *dptr
++ = ROSE_DTE_ORIGINATED
;
190 if (!rose_send_frame(skb
, neigh
))
195 * This routine is called when a Restart Confirmation is needed
197 void rose_transmit_restart_confirmation(struct rose_neigh
*neigh
)
203 len
= AX25_BPQ_HEADER_LEN
+ AX25_MAX_HEADER_LEN
+ ROSE_MIN_LEN
+ 1;
205 if ((skb
= alloc_skb(len
, GFP_ATOMIC
)) == NULL
)
208 skb_reserve(skb
, AX25_BPQ_HEADER_LEN
+ AX25_MAX_HEADER_LEN
);
210 dptr
= skb_put(skb
, ROSE_MIN_LEN
+ 1);
212 *dptr
++ = AX25_P_ROSE
;
215 *dptr
++ = ROSE_RESTART_CONFIRMATION
;
217 if (!rose_send_frame(skb
, neigh
))
222 * This routine is called when a Diagnostic is required.
224 void rose_transmit_diagnostic(struct rose_neigh
*neigh
, unsigned char diag
)
230 len
= AX25_BPQ_HEADER_LEN
+ AX25_MAX_HEADER_LEN
+ ROSE_MIN_LEN
+ 2;
232 if ((skb
= alloc_skb(len
, GFP_ATOMIC
)) == NULL
)
235 skb_reserve(skb
, AX25_BPQ_HEADER_LEN
+ AX25_MAX_HEADER_LEN
);
237 dptr
= skb_put(skb
, ROSE_MIN_LEN
+ 2);
239 *dptr
++ = AX25_P_ROSE
;
242 *dptr
++ = ROSE_DIAGNOSTIC
;
245 if (!rose_send_frame(skb
, neigh
))
250 * This routine is called when a Clear Request is needed outside of the context
251 * of a connected socket.
253 void rose_transmit_clear_request(struct rose_neigh
*neigh
, unsigned int lci
, unsigned char cause
, unsigned char diagnostic
)
259 len
= AX25_BPQ_HEADER_LEN
+ AX25_MAX_HEADER_LEN
+ ROSE_MIN_LEN
+ 3;
261 if ((skb
= alloc_skb(len
, GFP_ATOMIC
)) == NULL
)
264 skb_reserve(skb
, AX25_BPQ_HEADER_LEN
+ AX25_MAX_HEADER_LEN
);
266 dptr
= skb_put(skb
, ROSE_MIN_LEN
+ 3);
268 *dptr
++ = AX25_P_ROSE
;
269 *dptr
++ = ((lci
>> 8) & 0x0F) | ROSE_GFI
;
270 *dptr
++ = ((lci
>> 0) & 0xFF);
271 *dptr
++ = ROSE_CLEAR_REQUEST
;
273 *dptr
++ = diagnostic
;
275 if (!rose_send_frame(skb
, neigh
))
279 void rose_transmit_link(struct sk_buff
*skb
, struct rose_neigh
*neigh
)
284 if (call_fw_firewall(PF_ROSE
, skb
->dev
, skb
->data
, NULL
, &skb
) != FW_ACCEPT
) {
290 if (neigh
->loopback
) {
291 rose_loopback_queue(skb
, neigh
);
295 if (!rose_link_up(neigh
))
296 neigh
->restarted
= 0;
298 dptr
= skb_push(skb
, 1);
299 *dptr
++ = AX25_P_ROSE
;
301 if (neigh
->restarted
) {
302 if (!rose_send_frame(skb
, neigh
))
305 skb_queue_tail(&neigh
->queue
, skb
);
307 if (!rose_t0timer_running(neigh
)) {
308 rose_transmit_restart_request(neigh
);
310 rose_start_t0timer(neigh
);