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