bluetooth: hid: make Android code conditional
[linux-2.6.git] / net / rose / rose_link.c
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.
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>
19 #include <linux/slab.h>
20 #include <net/ax25.h>
21 #include <linux/inet.h>
22 #include <linux/netdevice.h>
23 #include <linux/skbuff.h>
24 #include <net/sock.h>
25 #include <asm/system.h>
26 #include <linux/fcntl.h>
27 #include <linux/mm.h>
28 #include <linux/interrupt.h>
29 #include <linux/netfilter.h>
30 #include <net/rose.h>
31
32 static void rose_ftimer_expiry(unsigned long);
33 static void rose_t0timer_expiry(unsigned long);
34
35 static void rose_transmit_restart_confirmation(struct rose_neigh *neigh);
36 static void rose_transmit_restart_request(struct rose_neigh *neigh);
37
38 void rose_start_ftimer(struct rose_neigh *neigh)
39 {
40         del_timer(&neigh->ftimer);
41
42         neigh->ftimer.data     = (unsigned long)neigh;
43         neigh->ftimer.function = &rose_ftimer_expiry;
44         neigh->ftimer.expires  =
45                 jiffies + msecs_to_jiffies(sysctl_rose_link_fail_timeout);
46
47         add_timer(&neigh->ftimer);
48 }
49
50 static void rose_start_t0timer(struct rose_neigh *neigh)
51 {
52         del_timer(&neigh->t0timer);
53
54         neigh->t0timer.data     = (unsigned long)neigh;
55         neigh->t0timer.function = &rose_t0timer_expiry;
56         neigh->t0timer.expires  =
57                 jiffies + msecs_to_jiffies(sysctl_rose_restart_request_timeout);
58
59         add_timer(&neigh->t0timer);
60 }
61
62 void rose_stop_ftimer(struct rose_neigh *neigh)
63 {
64         del_timer(&neigh->ftimer);
65 }
66
67 void rose_stop_t0timer(struct rose_neigh *neigh)
68 {
69         del_timer(&neigh->t0timer);
70 }
71
72 int rose_ftimer_running(struct rose_neigh *neigh)
73 {
74         return timer_pending(&neigh->ftimer);
75 }
76
77 static int rose_t0timer_running(struct rose_neigh *neigh)
78 {
79         return timer_pending(&neigh->t0timer);
80 }
81
82 static void rose_ftimer_expiry(unsigned long param)
83 {
84 }
85
86 static void rose_t0timer_expiry(unsigned long param)
87 {
88         struct rose_neigh *neigh = (struct rose_neigh *)param;
89
90         rose_transmit_restart_request(neigh);
91
92         neigh->dce_mode = 0;
93
94         rose_start_t0timer(neigh);
95 }
96
97 /*
98  *      Interface to ax25_send_frame. Changes my level 2 callsign depending
99  *      on whether we have a global ROSE callsign or use the default port
100  *      callsign.
101  */
102 static int rose_send_frame(struct sk_buff *skb, struct rose_neigh *neigh)
103 {
104         ax25_address *rose_call;
105         ax25_cb *ax25s;
106
107         if (ax25cmp(&rose_callsign, &null_ax25_address) == 0)
108                 rose_call = (ax25_address *)neigh->dev->dev_addr;
109         else
110                 rose_call = &rose_callsign;
111
112         ax25s = neigh->ax25;
113         neigh->ax25 = ax25_send_frame(skb, 260, rose_call, &neigh->callsign, neigh->digipeat, neigh->dev);
114         if (ax25s)
115                 ax25_cb_put(ax25s);
116
117         return neigh->ax25 != NULL;
118 }
119
120 /*
121  *      Interface to ax25_link_up. Changes my level 2 callsign depending
122  *      on whether we have a global ROSE callsign or use the default port
123  *      callsign.
124  */
125 static int rose_link_up(struct rose_neigh *neigh)
126 {
127         ax25_address *rose_call;
128         ax25_cb *ax25s;
129
130         if (ax25cmp(&rose_callsign, &null_ax25_address) == 0)
131                 rose_call = (ax25_address *)neigh->dev->dev_addr;
132         else
133                 rose_call = &rose_callsign;
134
135         ax25s = neigh->ax25;
136         neigh->ax25 = ax25_find_cb(rose_call, &neigh->callsign, neigh->digipeat, neigh->dev);
137         if (ax25s)
138                 ax25_cb_put(ax25s);
139
140         return neigh->ax25 != NULL;
141 }
142
143 /*
144  *      This handles all restart and diagnostic frames.
145  */
146 void rose_link_rx_restart(struct sk_buff *skb, struct rose_neigh *neigh, unsigned short frametype)
147 {
148         struct sk_buff *skbn;
149
150         switch (frametype) {
151         case ROSE_RESTART_REQUEST:
152                 rose_stop_t0timer(neigh);
153                 neigh->restarted = 1;
154                 neigh->dce_mode  = (skb->data[3] == ROSE_DTE_ORIGINATED);
155                 rose_transmit_restart_confirmation(neigh);
156                 break;
157
158         case ROSE_RESTART_CONFIRMATION:
159                 rose_stop_t0timer(neigh);
160                 neigh->restarted = 1;
161                 break;
162
163         case ROSE_DIAGNOSTIC:
164                 printk(KERN_WARNING "ROSE: received diagnostic #%d - %02X %02X %02X\n", skb->data[3], skb->data[4], skb->data[5], skb->data[6]);
165                 break;
166
167         default:
168                 printk(KERN_WARNING "ROSE: received unknown %02X with LCI 000\n", frametype);
169                 break;
170         }
171
172         if (neigh->restarted) {
173                 while ((skbn = skb_dequeue(&neigh->queue)) != NULL)
174                         if (!rose_send_frame(skbn, neigh))
175                                 kfree_skb(skbn);
176         }
177 }
178
179 /*
180  *      This routine is called when a Restart Request is needed
181  */
182 static void rose_transmit_restart_request(struct rose_neigh *neigh)
183 {
184         struct sk_buff *skb;
185         unsigned char *dptr;
186         int len;
187
188         len = AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + ROSE_MIN_LEN + 3;
189
190         if ((skb = alloc_skb(len, GFP_ATOMIC)) == NULL)
191                 return;
192
193         skb_reserve(skb, AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN);
194
195         dptr = skb_put(skb, ROSE_MIN_LEN + 3);
196
197         *dptr++ = AX25_P_ROSE;
198         *dptr++ = ROSE_GFI;
199         *dptr++ = 0x00;
200         *dptr++ = ROSE_RESTART_REQUEST;
201         *dptr++ = ROSE_DTE_ORIGINATED;
202         *dptr++ = 0;
203
204         if (!rose_send_frame(skb, neigh))
205                 kfree_skb(skb);
206 }
207
208 /*
209  * This routine is called when a Restart Confirmation is needed
210  */
211 static void rose_transmit_restart_confirmation(struct rose_neigh *neigh)
212 {
213         struct sk_buff *skb;
214         unsigned char *dptr;
215         int len;
216
217         len = AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + ROSE_MIN_LEN + 1;
218
219         if ((skb = alloc_skb(len, GFP_ATOMIC)) == NULL)
220                 return;
221
222         skb_reserve(skb, AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN);
223
224         dptr = skb_put(skb, ROSE_MIN_LEN + 1);
225
226         *dptr++ = AX25_P_ROSE;
227         *dptr++ = ROSE_GFI;
228         *dptr++ = 0x00;
229         *dptr++ = ROSE_RESTART_CONFIRMATION;
230
231         if (!rose_send_frame(skb, neigh))
232                 kfree_skb(skb);
233 }
234
235 /*
236  * This routine is called when a Clear Request is needed outside of the context
237  * of a connected socket.
238  */
239 void rose_transmit_clear_request(struct rose_neigh *neigh, unsigned int lci, unsigned char cause, unsigned char diagnostic)
240 {
241         struct sk_buff *skb;
242         unsigned char *dptr;
243         int len;
244
245         len = AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + ROSE_MIN_LEN + 3;
246
247         if ((skb = alloc_skb(len, GFP_ATOMIC)) == NULL)
248                 return;
249
250         skb_reserve(skb, AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN);
251
252         dptr = skb_put(skb, ROSE_MIN_LEN + 3);
253
254         *dptr++ = AX25_P_ROSE;
255         *dptr++ = ((lci >> 8) & 0x0F) | ROSE_GFI;
256         *dptr++ = ((lci >> 0) & 0xFF);
257         *dptr++ = ROSE_CLEAR_REQUEST;
258         *dptr++ = cause;
259         *dptr++ = diagnostic;
260
261         if (!rose_send_frame(skb, neigh))
262                 kfree_skb(skb);
263 }
264
265 void rose_transmit_link(struct sk_buff *skb, struct rose_neigh *neigh)
266 {
267         unsigned char *dptr;
268
269         if (neigh->loopback) {
270                 rose_loopback_queue(skb, neigh);
271                 return;
272         }
273
274         if (!rose_link_up(neigh))
275                 neigh->restarted = 0;
276
277         dptr = skb_push(skb, 1);
278         *dptr++ = AX25_P_ROSE;
279
280         if (neigh->restarted) {
281                 if (!rose_send_frame(skb, neigh))
282                         kfree_skb(skb);
283         } else {
284                 skb_queue_tail(&neigh->queue, skb);
285
286                 if (!rose_t0timer_running(neigh)) {
287                         rose_transmit_restart_request(neigh);
288                         neigh->dce_mode = 0;
289                         rose_start_t0timer(neigh);
290                 }
291         }
292 }