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>
19 #include <linux/slab.h>
21 #include <linux/inet.h>
22 #include <linux/netdevice.h>
23 #include <linux/skbuff.h>
25 #include <linux/fcntl.h>
27 #include <linux/interrupt.h>
30 static void rose_ftimer_expiry(unsigned long);
31 static void rose_t0timer_expiry(unsigned long);
33 static void rose_transmit_restart_confirmation(struct rose_neigh *neigh);
34 static void rose_transmit_restart_request(struct rose_neigh *neigh);
36 void rose_start_ftimer(struct rose_neigh *neigh)
38 del_timer(&neigh->ftimer);
40 neigh->ftimer.data = (unsigned long)neigh;
41 neigh->ftimer.function = &rose_ftimer_expiry;
42 neigh->ftimer.expires =
43 jiffies + msecs_to_jiffies(sysctl_rose_link_fail_timeout);
45 add_timer(&neigh->ftimer);
48 static void rose_start_t0timer(struct rose_neigh *neigh)
50 del_timer(&neigh->t0timer);
52 neigh->t0timer.data = (unsigned long)neigh;
53 neigh->t0timer.function = &rose_t0timer_expiry;
54 neigh->t0timer.expires =
55 jiffies + msecs_to_jiffies(sysctl_rose_restart_request_timeout);
57 add_timer(&neigh->t0timer);
60 void rose_stop_ftimer(struct rose_neigh *neigh)
62 del_timer(&neigh->ftimer);
65 void rose_stop_t0timer(struct rose_neigh *neigh)
67 del_timer(&neigh->t0timer);
70 int rose_ftimer_running(struct rose_neigh *neigh)
72 return timer_pending(&neigh->ftimer);
75 static int rose_t0timer_running(struct rose_neigh *neigh)
77 return timer_pending(&neigh->t0timer);
80 static void rose_ftimer_expiry(unsigned long param)
84 static void rose_t0timer_expiry(unsigned long param)
86 struct rose_neigh *neigh = (struct rose_neigh *)param;
88 rose_transmit_restart_request(neigh);
92 rose_start_t0timer(neigh);
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
100 static int rose_send_frame(struct sk_buff *skb, struct rose_neigh *neigh)
102 ax25_address *rose_call;
105 if (ax25cmp(&rose_callsign, &null_ax25_address) == 0)
106 rose_call = (ax25_address *)neigh->dev->dev_addr;
108 rose_call = &rose_callsign;
111 neigh->ax25 = ax25_send_frame(skb, 260, rose_call, &neigh->callsign, neigh->digipeat, neigh->dev);
115 return neigh->ax25 != NULL;
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
123 static int rose_link_up(struct rose_neigh *neigh)
125 ax25_address *rose_call;
128 if (ax25cmp(&rose_callsign, &null_ax25_address) == 0)
129 rose_call = (ax25_address *)neigh->dev->dev_addr;
131 rose_call = &rose_callsign;
134 neigh->ax25 = ax25_find_cb(rose_call, &neigh->callsign, neigh->digipeat, neigh->dev);
138 return neigh->ax25 != NULL;
142 * This handles all restart and diagnostic frames.
144 void rose_link_rx_restart(struct sk_buff *skb, struct rose_neigh *neigh, unsigned short frametype)
146 struct sk_buff *skbn;
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);
156 case ROSE_RESTART_CONFIRMATION:
157 rose_stop_t0timer(neigh);
158 neigh->restarted = 1;
161 case ROSE_DIAGNOSTIC:
162 pr_warn("ROSE: received diagnostic #%d - %3ph\n", skb->data[3],
167 printk(KERN_WARNING "ROSE: received unknown %02X with LCI 000\n", frametype);
171 if (neigh->restarted) {
172 while ((skbn = skb_dequeue(&neigh->queue)) != NULL)
173 if (!rose_send_frame(skbn, neigh))
179 * This routine is called when a Restart Request is needed
181 static void rose_transmit_restart_request(struct rose_neigh *neigh)
187 len = AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + ROSE_MIN_LEN + 3;
189 if ((skb = alloc_skb(len, GFP_ATOMIC)) == NULL)
192 skb_reserve(skb, AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN);
194 dptr = skb_put(skb, ROSE_MIN_LEN + 3);
196 *dptr++ = AX25_P_ROSE;
199 *dptr++ = ROSE_RESTART_REQUEST;
200 *dptr++ = ROSE_DTE_ORIGINATED;
203 if (!rose_send_frame(skb, neigh))
208 * This routine is called when a Restart Confirmation is needed
210 static void rose_transmit_restart_confirmation(struct rose_neigh *neigh)
216 len = AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + ROSE_MIN_LEN + 1;
218 if ((skb = alloc_skb(len, GFP_ATOMIC)) == NULL)
221 skb_reserve(skb, AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN);
223 dptr = skb_put(skb, ROSE_MIN_LEN + 1);
225 *dptr++ = AX25_P_ROSE;
228 *dptr++ = ROSE_RESTART_CONFIRMATION;
230 if (!rose_send_frame(skb, neigh))
235 * This routine is called when a Clear Request is needed outside of the context
236 * of a connected socket.
238 void rose_transmit_clear_request(struct rose_neigh *neigh, unsigned int lci, unsigned char cause, unsigned char diagnostic)
244 len = AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + ROSE_MIN_LEN + 3;
246 if ((skb = alloc_skb(len, GFP_ATOMIC)) == NULL)
249 skb_reserve(skb, AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN);
251 dptr = skb_put(skb, ROSE_MIN_LEN + 3);
253 *dptr++ = AX25_P_ROSE;
254 *dptr++ = ((lci >> 8) & 0x0F) | ROSE_GFI;
255 *dptr++ = ((lci >> 0) & 0xFF);
256 *dptr++ = ROSE_CLEAR_REQUEST;
258 *dptr++ = diagnostic;
260 if (!rose_send_frame(skb, neigh))
264 void rose_transmit_link(struct sk_buff *skb, struct rose_neigh *neigh)
268 if (neigh->loopback) {
269 rose_loopback_queue(skb, neigh);
273 if (!rose_link_up(neigh))
274 neigh->restarted = 0;
276 dptr = skb_push(skb, 1);
277 *dptr++ = AX25_P_ROSE;
279 if (neigh->restarted) {
280 if (!rose_send_frame(skb, neigh))
283 skb_queue_tail(&neigh->queue, skb);
285 if (!rose_t0timer_running(neigh)) {
286 rose_transmit_restart_request(neigh);
288 rose_start_t0timer(neigh);