Commit | Line | Data |
---|---|---|
2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 | 2 | /* |
1da177e4 LT |
3 | * |
4 | * Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk) | |
5 | */ | |
6 | #include <linux/errno.h> | |
7 | #include <linux/types.h> | |
8 | #include <linux/socket.h> | |
9 | #include <linux/in.h> | |
10 | #include <linux/kernel.h> | |
11 | #include <linux/jiffies.h> | |
12 | #include <linux/timer.h> | |
13 | #include <linux/string.h> | |
14 | #include <linux/sockios.h> | |
15 | #include <linux/net.h> | |
5a0e3ad6 | 16 | #include <linux/slab.h> |
1da177e4 LT |
17 | #include <net/ax25.h> |
18 | #include <linux/inet.h> | |
19 | #include <linux/netdevice.h> | |
20 | #include <linux/skbuff.h> | |
21 | #include <net/sock.h> | |
1da177e4 LT |
22 | #include <linux/fcntl.h> |
23 | #include <linux/mm.h> | |
24 | #include <linux/interrupt.h> | |
1da177e4 LT |
25 | #include <net/rose.h> |
26 | ||
4966babd KC |
27 | static void rose_ftimer_expiry(struct timer_list *); |
28 | static void rose_t0timer_expiry(struct timer_list *); | |
1da177e4 LT |
29 | |
30 | static void rose_transmit_restart_confirmation(struct rose_neigh *neigh); | |
31 | static void rose_transmit_restart_request(struct rose_neigh *neigh); | |
32 | ||
33 | void rose_start_ftimer(struct rose_neigh *neigh) | |
34 | { | |
35 | del_timer(&neigh->ftimer); | |
36 | ||
841b86f3 | 37 | neigh->ftimer.function = rose_ftimer_expiry; |
82e84249 RB |
38 | neigh->ftimer.expires = |
39 | jiffies + msecs_to_jiffies(sysctl_rose_link_fail_timeout); | |
1da177e4 LT |
40 | |
41 | add_timer(&neigh->ftimer); | |
42 | } | |
43 | ||
44 | static void rose_start_t0timer(struct rose_neigh *neigh) | |
45 | { | |
46 | del_timer(&neigh->t0timer); | |
47 | ||
841b86f3 | 48 | neigh->t0timer.function = rose_t0timer_expiry; |
82e84249 RB |
49 | neigh->t0timer.expires = |
50 | jiffies + msecs_to_jiffies(sysctl_rose_restart_request_timeout); | |
1da177e4 LT |
51 | |
52 | add_timer(&neigh->t0timer); | |
53 | } | |
54 | ||
55 | void rose_stop_ftimer(struct rose_neigh *neigh) | |
56 | { | |
57 | del_timer(&neigh->ftimer); | |
58 | } | |
59 | ||
60 | void rose_stop_t0timer(struct rose_neigh *neigh) | |
61 | { | |
62 | del_timer(&neigh->t0timer); | |
63 | } | |
64 | ||
65 | int rose_ftimer_running(struct rose_neigh *neigh) | |
66 | { | |
67 | return timer_pending(&neigh->ftimer); | |
68 | } | |
69 | ||
70 | static int rose_t0timer_running(struct rose_neigh *neigh) | |
71 | { | |
72 | return timer_pending(&neigh->t0timer); | |
73 | } | |
74 | ||
4966babd | 75 | static void rose_ftimer_expiry(struct timer_list *t) |
1da177e4 LT |
76 | { |
77 | } | |
78 | ||
4966babd | 79 | static void rose_t0timer_expiry(struct timer_list *t) |
1da177e4 | 80 | { |
4966babd | 81 | struct rose_neigh *neigh = from_timer(neigh, t, t0timer); |
1da177e4 LT |
82 | |
83 | rose_transmit_restart_request(neigh); | |
84 | ||
85 | neigh->dce_mode = 0; | |
86 | ||
87 | rose_start_t0timer(neigh); | |
88 | } | |
89 | ||
90 | /* | |
91 | * Interface to ax25_send_frame. Changes my level 2 callsign depending | |
92 | * on whether we have a global ROSE callsign or use the default port | |
93 | * callsign. | |
94 | */ | |
95 | static int rose_send_frame(struct sk_buff *skb, struct rose_neigh *neigh) | |
96 | { | |
c045ad2c | 97 | const ax25_address *rose_call; |
d00c362f | 98 | ax25_cb *ax25s; |
1da177e4 LT |
99 | |
100 | if (ax25cmp(&rose_callsign, &null_ax25_address) == 0) | |
c045ad2c | 101 | rose_call = (const ax25_address *)neigh->dev->dev_addr; |
1da177e4 LT |
102 | else |
103 | rose_call = &rose_callsign; | |
104 | ||
d00c362f | 105 | ax25s = neigh->ax25; |
1da177e4 | 106 | neigh->ax25 = ax25_send_frame(skb, 260, rose_call, &neigh->callsign, neigh->digipeat, neigh->dev); |
d00c362f JP |
107 | if (ax25s) |
108 | ax25_cb_put(ax25s); | |
1da177e4 | 109 | |
a02cec21 | 110 | return neigh->ax25 != NULL; |
1da177e4 LT |
111 | } |
112 | ||
113 | /* | |
114 | * Interface to ax25_link_up. Changes my level 2 callsign depending | |
115 | * on whether we have a global ROSE callsign or use the default port | |
116 | * callsign. | |
117 | */ | |
118 | static int rose_link_up(struct rose_neigh *neigh) | |
119 | { | |
c045ad2c | 120 | const ax25_address *rose_call; |
d00c362f | 121 | ax25_cb *ax25s; |
1da177e4 LT |
122 | |
123 | if (ax25cmp(&rose_callsign, &null_ax25_address) == 0) | |
c045ad2c | 124 | rose_call = (const ax25_address *)neigh->dev->dev_addr; |
1da177e4 LT |
125 | else |
126 | rose_call = &rose_callsign; | |
127 | ||
d00c362f | 128 | ax25s = neigh->ax25; |
1da177e4 | 129 | neigh->ax25 = ax25_find_cb(rose_call, &neigh->callsign, neigh->digipeat, neigh->dev); |
d00c362f JP |
130 | if (ax25s) |
131 | ax25_cb_put(ax25s); | |
1da177e4 | 132 | |
a02cec21 | 133 | return neigh->ax25 != NULL; |
1da177e4 LT |
134 | } |
135 | ||
136 | /* | |
137 | * This handles all restart and diagnostic frames. | |
138 | */ | |
139 | void rose_link_rx_restart(struct sk_buff *skb, struct rose_neigh *neigh, unsigned short frametype) | |
140 | { | |
141 | struct sk_buff *skbn; | |
142 | ||
143 | switch (frametype) { | |
144 | case ROSE_RESTART_REQUEST: | |
145 | rose_stop_t0timer(neigh); | |
146 | neigh->restarted = 1; | |
147 | neigh->dce_mode = (skb->data[3] == ROSE_DTE_ORIGINATED); | |
148 | rose_transmit_restart_confirmation(neigh); | |
149 | break; | |
150 | ||
151 | case ROSE_RESTART_CONFIRMATION: | |
152 | rose_stop_t0timer(neigh); | |
153 | neigh->restarted = 1; | |
154 | break; | |
155 | ||
156 | case ROSE_DIAGNOSTIC: | |
13aa3463 AS |
157 | pr_warn("ROSE: received diagnostic #%d - %3ph\n", skb->data[3], |
158 | skb->data + 4); | |
1da177e4 LT |
159 | break; |
160 | ||
161 | default: | |
162 | printk(KERN_WARNING "ROSE: received unknown %02X with LCI 000\n", frametype); | |
163 | break; | |
164 | } | |
165 | ||
166 | if (neigh->restarted) { | |
167 | while ((skbn = skb_dequeue(&neigh->queue)) != NULL) | |
168 | if (!rose_send_frame(skbn, neigh)) | |
169 | kfree_skb(skbn); | |
170 | } | |
171 | } | |
172 | ||
173 | /* | |
174 | * This routine is called when a Restart Request is needed | |
175 | */ | |
176 | static void rose_transmit_restart_request(struct rose_neigh *neigh) | |
177 | { | |
178 | struct sk_buff *skb; | |
179 | unsigned char *dptr; | |
180 | int len; | |
181 | ||
182 | len = AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + ROSE_MIN_LEN + 3; | |
183 | ||
184 | if ((skb = alloc_skb(len, GFP_ATOMIC)) == NULL) | |
185 | return; | |
186 | ||
187 | skb_reserve(skb, AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN); | |
188 | ||
189 | dptr = skb_put(skb, ROSE_MIN_LEN + 3); | |
190 | ||
191 | *dptr++ = AX25_P_ROSE; | |
192 | *dptr++ = ROSE_GFI; | |
193 | *dptr++ = 0x00; | |
194 | *dptr++ = ROSE_RESTART_REQUEST; | |
195 | *dptr++ = ROSE_DTE_ORIGINATED; | |
196 | *dptr++ = 0; | |
197 | ||
198 | if (!rose_send_frame(skb, neigh)) | |
199 | kfree_skb(skb); | |
200 | } | |
201 | ||
202 | /* | |
203 | * This routine is called when a Restart Confirmation is needed | |
204 | */ | |
205 | static void rose_transmit_restart_confirmation(struct rose_neigh *neigh) | |
206 | { | |
207 | struct sk_buff *skb; | |
208 | unsigned char *dptr; | |
209 | int len; | |
210 | ||
211 | len = AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + ROSE_MIN_LEN + 1; | |
212 | ||
213 | if ((skb = alloc_skb(len, GFP_ATOMIC)) == NULL) | |
214 | return; | |
215 | ||
216 | skb_reserve(skb, AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN); | |
217 | ||
218 | dptr = skb_put(skb, ROSE_MIN_LEN + 1); | |
219 | ||
220 | *dptr++ = AX25_P_ROSE; | |
221 | *dptr++ = ROSE_GFI; | |
222 | *dptr++ = 0x00; | |
223 | *dptr++ = ROSE_RESTART_CONFIRMATION; | |
224 | ||
225 | if (!rose_send_frame(skb, neigh)) | |
226 | kfree_skb(skb); | |
227 | } | |
228 | ||
229 | /* | |
230 | * This routine is called when a Clear Request is needed outside of the context | |
231 | * of a connected socket. | |
232 | */ | |
233 | void rose_transmit_clear_request(struct rose_neigh *neigh, unsigned int lci, unsigned char cause, unsigned char diagnostic) | |
234 | { | |
235 | struct sk_buff *skb; | |
236 | unsigned char *dptr; | |
237 | int len; | |
238 | ||
e97c089d ZQ |
239 | if (!neigh->dev) |
240 | return; | |
241 | ||
1da177e4 LT |
242 | len = AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + ROSE_MIN_LEN + 3; |
243 | ||
244 | if ((skb = alloc_skb(len, GFP_ATOMIC)) == NULL) | |
245 | return; | |
246 | ||
247 | skb_reserve(skb, AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN); | |
248 | ||
249 | dptr = skb_put(skb, ROSE_MIN_LEN + 3); | |
250 | ||
251 | *dptr++ = AX25_P_ROSE; | |
252 | *dptr++ = ((lci >> 8) & 0x0F) | ROSE_GFI; | |
253 | *dptr++ = ((lci >> 0) & 0xFF); | |
254 | *dptr++ = ROSE_CLEAR_REQUEST; | |
255 | *dptr++ = cause; | |
256 | *dptr++ = diagnostic; | |
257 | ||
258 | if (!rose_send_frame(skb, neigh)) | |
259 | kfree_skb(skb); | |
260 | } | |
261 | ||
262 | void rose_transmit_link(struct sk_buff *skb, struct rose_neigh *neigh) | |
263 | { | |
264 | unsigned char *dptr; | |
265 | ||
1da177e4 LT |
266 | if (neigh->loopback) { |
267 | rose_loopback_queue(skb, neigh); | |
268 | return; | |
269 | } | |
270 | ||
271 | if (!rose_link_up(neigh)) | |
272 | neigh->restarted = 0; | |
273 | ||
274 | dptr = skb_push(skb, 1); | |
275 | *dptr++ = AX25_P_ROSE; | |
276 | ||
277 | if (neigh->restarted) { | |
278 | if (!rose_send_frame(skb, neigh)) | |
279 | kfree_skb(skb); | |
280 | } else { | |
281 | skb_queue_tail(&neigh->queue, skb); | |
282 | ||
283 | if (!rose_t0timer_running(neigh)) { | |
284 | rose_transmit_restart_request(neigh); | |
285 | neigh->dce_mode = 0; | |
286 | rose_start_t0timer(neigh); | |
287 | } | |
288 | } | |
289 | } |