initial commit with v2.6.9
[linux-2.6.9-moxart.git] / net / rose / rose_link.c
blob8974778d70d7323f8bd67531e0f134911a78dd97
1 /*
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)
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>
19 #include <net/ax25.h>
20 #include <linux/inet.h>
21 #include <linux/netdevice.h>
22 #include <linux/skbuff.h>
23 #include <net/sock.h>
24 #include <asm/system.h>
25 #include <linux/fcntl.h>
26 #include <linux/mm.h>
27 #include <linux/interrupt.h>
28 #include <linux/netfilter.h>
29 #include <net/rose.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);
86 neigh->dce_mode = 0;
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
94 * callsign.
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;
102 else
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
113 * callsign.
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;
121 else
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;
136 switch (frametype) {
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);
142 break;
144 case ROSE_RESTART_CONFIRMATION:
145 rose_stop_t0timer(neigh);
146 neigh->restarted = 1;
147 break;
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]);
151 break;
153 default:
154 printk(KERN_WARNING "ROSE: received unknown %02X with LCI 000\n", frametype);
155 break;
158 if (neigh->restarted) {
159 while ((skbn = skb_dequeue(&neigh->queue)) != NULL)
160 if (!rose_send_frame(skbn, neigh))
161 kfree_skb(skbn);
166 * This routine is called when a Restart Request is needed
168 void rose_transmit_restart_request(struct rose_neigh *neigh)
170 struct sk_buff *skb;
171 unsigned char *dptr;
172 int len;
174 len = AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + ROSE_MIN_LEN + 3;
176 if ((skb = alloc_skb(len, GFP_ATOMIC)) == NULL)
177 return;
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;
184 *dptr++ = ROSE_GFI;
185 *dptr++ = 0x00;
186 *dptr++ = ROSE_RESTART_REQUEST;
187 *dptr++ = ROSE_DTE_ORIGINATED;
188 *dptr++ = 0;
190 if (!rose_send_frame(skb, neigh))
191 kfree_skb(skb);
195 * This routine is called when a Restart Confirmation is needed
197 void rose_transmit_restart_confirmation(struct rose_neigh *neigh)
199 struct sk_buff *skb;
200 unsigned char *dptr;
201 int len;
203 len = AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + ROSE_MIN_LEN + 1;
205 if ((skb = alloc_skb(len, GFP_ATOMIC)) == NULL)
206 return;
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;
213 *dptr++ = ROSE_GFI;
214 *dptr++ = 0x00;
215 *dptr++ = ROSE_RESTART_CONFIRMATION;
217 if (!rose_send_frame(skb, neigh))
218 kfree_skb(skb);
222 * This routine is called when a Diagnostic is required.
224 void rose_transmit_diagnostic(struct rose_neigh *neigh, unsigned char diag)
226 struct sk_buff *skb;
227 unsigned char *dptr;
228 int len;
230 len = AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + ROSE_MIN_LEN + 2;
232 if ((skb = alloc_skb(len, GFP_ATOMIC)) == NULL)
233 return;
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;
240 *dptr++ = ROSE_GFI;
241 *dptr++ = 0x00;
242 *dptr++ = ROSE_DIAGNOSTIC;
243 *dptr++ = diag;
245 if (!rose_send_frame(skb, neigh))
246 kfree_skb(skb);
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)
255 struct sk_buff *skb;
256 unsigned char *dptr;
257 int len;
259 len = AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + ROSE_MIN_LEN + 3;
261 if ((skb = alloc_skb(len, GFP_ATOMIC)) == NULL)
262 return;
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;
272 *dptr++ = cause;
273 *dptr++ = diagnostic;
275 if (!rose_send_frame(skb, neigh))
276 kfree_skb(skb);
279 void rose_transmit_link(struct sk_buff *skb, struct rose_neigh *neigh)
281 unsigned char *dptr;
283 #if 0
284 if (call_fw_firewall(PF_ROSE, skb->dev, skb->data, NULL, &skb) != FW_ACCEPT) {
285 kfree_skb(skb);
286 return;
288 #endif
290 if (neigh->loopback) {
291 rose_loopback_queue(skb, neigh);
292 return;
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))
303 kfree_skb(skb);
304 } else {
305 skb_queue_tail(&neigh->queue, skb);
307 if (!rose_t0timer_running(neigh)) {
308 rose_transmit_restart_request(neigh);
309 neigh->dce_mode = 0;
310 rose_start_t0timer(neigh);