Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * LAPB release 002 | |
3 | * | |
4 | * This code REQUIRES 2.1.15 or higher/ NET3.038 | |
5 | * | |
6 | * This module: | |
7 | * This module is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU General Public License | |
9 | * as published by the Free Software Foundation; either version | |
10 | * 2 of the License, or (at your option) any later version. | |
11 | * | |
12 | * History | |
13 | * LAPB 001 Jonathan Naulor Started Coding | |
14 | * LAPB 002 Jonathan Naylor New timer architecture. | |
15 | * 2000-10-29 Henner Eisen lapb_data_indication() return status. | |
16 | */ | |
17 | ||
a508da6c JP |
18 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
19 | ||
1da177e4 LT |
20 | #include <linux/errno.h> |
21 | #include <linux/types.h> | |
22 | #include <linux/socket.h> | |
23 | #include <linux/in.h> | |
24 | #include <linux/kernel.h> | |
1da177e4 LT |
25 | #include <linux/timer.h> |
26 | #include <linux/string.h> | |
27 | #include <linux/sockios.h> | |
28 | #include <linux/net.h> | |
29 | #include <linux/inet.h> | |
30 | #include <linux/netdevice.h> | |
31 | #include <linux/skbuff.h> | |
5a0e3ad6 | 32 | #include <linux/slab.h> |
1da177e4 LT |
33 | #include <net/sock.h> |
34 | #include <asm/uaccess.h> | |
1da177e4 LT |
35 | #include <linux/fcntl.h> |
36 | #include <linux/mm.h> | |
37 | #include <linux/interrupt.h> | |
38 | #include <net/lapb.h> | |
39 | ||
40 | /* | |
41 | * State machine for state 0, Disconnected State. | |
42 | * The handling of the timer(s) is in file lapb_timer.c. | |
43 | */ | |
44 | static void lapb_state0_machine(struct lapb_cb *lapb, struct sk_buff *skb, | |
45 | struct lapb_frame *frame) | |
46 | { | |
47 | switch (frame->type) { | |
fcb261f3 | 48 | case LAPB_SABM: |
a508da6c | 49 | lapb_dbg(1, "(%p) S0 RX SABM(%d)\n", lapb->dev, frame->pf); |
fcb261f3 | 50 | if (lapb->mode & LAPB_EXTENDED) { |
a508da6c JP |
51 | lapb_dbg(1, "(%p) S0 TX DM(%d)\n", |
52 | lapb->dev, frame->pf); | |
fcb261f3 JP |
53 | lapb_send_control(lapb, LAPB_DM, frame->pf, |
54 | LAPB_RESPONSE); | |
55 | } else { | |
a508da6c JP |
56 | lapb_dbg(1, "(%p) S0 TX UA(%d)\n", |
57 | lapb->dev, frame->pf); | |
58 | lapb_dbg(0, "(%p) S0 -> S3\n", lapb->dev); | |
fcb261f3 JP |
59 | lapb_send_control(lapb, LAPB_UA, frame->pf, |
60 | LAPB_RESPONSE); | |
61 | lapb_stop_t1timer(lapb); | |
62 | lapb_stop_t2timer(lapb); | |
63 | lapb->state = LAPB_STATE_3; | |
64 | lapb->condition = 0x00; | |
65 | lapb->n2count = 0; | |
66 | lapb->vs = 0; | |
67 | lapb->vr = 0; | |
68 | lapb->va = 0; | |
69 | lapb_connect_indication(lapb, LAPB_OK); | |
70 | } | |
71 | break; | |
1da177e4 | 72 | |
fcb261f3 | 73 | case LAPB_SABME: |
a508da6c | 74 | lapb_dbg(1, "(%p) S0 RX SABME(%d)\n", lapb->dev, frame->pf); |
fcb261f3 | 75 | if (lapb->mode & LAPB_EXTENDED) { |
a508da6c JP |
76 | lapb_dbg(1, "(%p) S0 TX UA(%d)\n", |
77 | lapb->dev, frame->pf); | |
78 | lapb_dbg(0, "(%p) S0 -> S3\n", lapb->dev); | |
fcb261f3 JP |
79 | lapb_send_control(lapb, LAPB_UA, frame->pf, |
80 | LAPB_RESPONSE); | |
81 | lapb_stop_t1timer(lapb); | |
82 | lapb_stop_t2timer(lapb); | |
83 | lapb->state = LAPB_STATE_3; | |
84 | lapb->condition = 0x00; | |
85 | lapb->n2count = 0; | |
86 | lapb->vs = 0; | |
87 | lapb->vr = 0; | |
88 | lapb->va = 0; | |
89 | lapb_connect_indication(lapb, LAPB_OK); | |
90 | } else { | |
a508da6c JP |
91 | lapb_dbg(1, "(%p) S0 TX DM(%d)\n", |
92 | lapb->dev, frame->pf); | |
fcb261f3 JP |
93 | lapb_send_control(lapb, LAPB_DM, frame->pf, |
94 | LAPB_RESPONSE); | |
95 | } | |
96 | break; | |
1da177e4 | 97 | |
fcb261f3 | 98 | case LAPB_DISC: |
a508da6c JP |
99 | lapb_dbg(1, "(%p) S0 RX DISC(%d)\n", lapb->dev, frame->pf); |
100 | lapb_dbg(1, "(%p) S0 TX UA(%d)\n", lapb->dev, frame->pf); | |
fcb261f3 JP |
101 | lapb_send_control(lapb, LAPB_UA, frame->pf, LAPB_RESPONSE); |
102 | break; | |
1da177e4 | 103 | |
fcb261f3 JP |
104 | default: |
105 | break; | |
1da177e4 LT |
106 | } |
107 | ||
108 | kfree_skb(skb); | |
109 | } | |
110 | ||
111 | /* | |
112 | * State machine for state 1, Awaiting Connection State. | |
113 | * The handling of the timer(s) is in file lapb_timer.c. | |
114 | */ | |
115 | static void lapb_state1_machine(struct lapb_cb *lapb, struct sk_buff *skb, | |
116 | struct lapb_frame *frame) | |
117 | { | |
118 | switch (frame->type) { | |
fcb261f3 | 119 | case LAPB_SABM: |
a508da6c | 120 | lapb_dbg(1, "(%p) S1 RX SABM(%d)\n", lapb->dev, frame->pf); |
fcb261f3 | 121 | if (lapb->mode & LAPB_EXTENDED) { |
a508da6c JP |
122 | lapb_dbg(1, "(%p) S1 TX DM(%d)\n", |
123 | lapb->dev, frame->pf); | |
fcb261f3 JP |
124 | lapb_send_control(lapb, LAPB_DM, frame->pf, |
125 | LAPB_RESPONSE); | |
126 | } else { | |
a508da6c JP |
127 | lapb_dbg(1, "(%p) S1 TX UA(%d)\n", |
128 | lapb->dev, frame->pf); | |
fcb261f3 JP |
129 | lapb_send_control(lapb, LAPB_UA, frame->pf, |
130 | LAPB_RESPONSE); | |
131 | } | |
132 | break; | |
133 | ||
134 | case LAPB_SABME: | |
a508da6c | 135 | lapb_dbg(1, "(%p) S1 RX SABME(%d)\n", lapb->dev, frame->pf); |
fcb261f3 | 136 | if (lapb->mode & LAPB_EXTENDED) { |
a508da6c JP |
137 | lapb_dbg(1, "(%p) S1 TX UA(%d)\n", |
138 | lapb->dev, frame->pf); | |
fcb261f3 JP |
139 | lapb_send_control(lapb, LAPB_UA, frame->pf, |
140 | LAPB_RESPONSE); | |
141 | } else { | |
a508da6c JP |
142 | lapb_dbg(1, "(%p) S1 TX DM(%d)\n", |
143 | lapb->dev, frame->pf); | |
1da177e4 LT |
144 | lapb_send_control(lapb, LAPB_DM, frame->pf, |
145 | LAPB_RESPONSE); | |
fcb261f3 JP |
146 | } |
147 | break; | |
1da177e4 | 148 | |
fcb261f3 | 149 | case LAPB_DISC: |
a508da6c JP |
150 | lapb_dbg(1, "(%p) S1 RX DISC(%d)\n", lapb->dev, frame->pf); |
151 | lapb_dbg(1, "(%p) S1 TX DM(%d)\n", lapb->dev, frame->pf); | |
fcb261f3 JP |
152 | lapb_send_control(lapb, LAPB_DM, frame->pf, LAPB_RESPONSE); |
153 | break; | |
1da177e4 | 154 | |
fcb261f3 | 155 | case LAPB_UA: |
a508da6c | 156 | lapb_dbg(1, "(%p) S1 RX UA(%d)\n", lapb->dev, frame->pf); |
fcb261f3 | 157 | if (frame->pf) { |
a508da6c | 158 | lapb_dbg(0, "(%p) S1 -> S3\n", lapb->dev); |
fcb261f3 JP |
159 | lapb_stop_t1timer(lapb); |
160 | lapb_stop_t2timer(lapb); | |
161 | lapb->state = LAPB_STATE_3; | |
162 | lapb->condition = 0x00; | |
163 | lapb->n2count = 0; | |
164 | lapb->vs = 0; | |
165 | lapb->vr = 0; | |
166 | lapb->va = 0; | |
167 | lapb_connect_confirmation(lapb, LAPB_OK); | |
168 | } | |
169 | break; | |
170 | ||
171 | case LAPB_DM: | |
a508da6c | 172 | lapb_dbg(1, "(%p) S1 RX DM(%d)\n", lapb->dev, frame->pf); |
fcb261f3 | 173 | if (frame->pf) { |
a508da6c | 174 | lapb_dbg(0, "(%p) S1 -> S0\n", lapb->dev); |
fcb261f3 JP |
175 | lapb_clear_queues(lapb); |
176 | lapb->state = LAPB_STATE_0; | |
177 | lapb_start_t1timer(lapb); | |
178 | lapb_stop_t2timer(lapb); | |
179 | lapb_disconnect_indication(lapb, LAPB_REFUSED); | |
180 | } | |
181 | break; | |
1da177e4 LT |
182 | } |
183 | ||
184 | kfree_skb(skb); | |
185 | } | |
186 | ||
187 | /* | |
188 | * State machine for state 2, Awaiting Release State. | |
189 | * The handling of the timer(s) is in file lapb_timer.c | |
190 | */ | |
191 | static void lapb_state2_machine(struct lapb_cb *lapb, struct sk_buff *skb, | |
192 | struct lapb_frame *frame) | |
193 | { | |
194 | switch (frame->type) { | |
fcb261f3 JP |
195 | case LAPB_SABM: |
196 | case LAPB_SABME: | |
a508da6c JP |
197 | lapb_dbg(1, "(%p) S2 RX {SABM,SABME}(%d)\n", |
198 | lapb->dev, frame->pf); | |
199 | lapb_dbg(1, "(%p) S2 TX DM(%d)\n", lapb->dev, frame->pf); | |
fcb261f3 JP |
200 | lapb_send_control(lapb, LAPB_DM, frame->pf, LAPB_RESPONSE); |
201 | break; | |
1da177e4 | 202 | |
fcb261f3 | 203 | case LAPB_DISC: |
a508da6c JP |
204 | lapb_dbg(1, "(%p) S2 RX DISC(%d)\n", lapb->dev, frame->pf); |
205 | lapb_dbg(1, "(%p) S2 TX UA(%d)\n", lapb->dev, frame->pf); | |
fcb261f3 JP |
206 | lapb_send_control(lapb, LAPB_UA, frame->pf, LAPB_RESPONSE); |
207 | break; | |
1da177e4 | 208 | |
fcb261f3 | 209 | case LAPB_UA: |
a508da6c | 210 | lapb_dbg(1, "(%p) S2 RX UA(%d)\n", lapb->dev, frame->pf); |
fcb261f3 | 211 | if (frame->pf) { |
a508da6c | 212 | lapb_dbg(0, "(%p) S2 -> S0\n", lapb->dev); |
fcb261f3 JP |
213 | lapb->state = LAPB_STATE_0; |
214 | lapb_start_t1timer(lapb); | |
215 | lapb_stop_t2timer(lapb); | |
216 | lapb_disconnect_confirmation(lapb, LAPB_OK); | |
217 | } | |
218 | break; | |
1da177e4 | 219 | |
fcb261f3 | 220 | case LAPB_DM: |
a508da6c | 221 | lapb_dbg(1, "(%p) S2 RX DM(%d)\n", lapb->dev, frame->pf); |
fcb261f3 | 222 | if (frame->pf) { |
a508da6c | 223 | lapb_dbg(0, "(%p) S2 -> S0\n", lapb->dev); |
fcb261f3 JP |
224 | lapb->state = LAPB_STATE_0; |
225 | lapb_start_t1timer(lapb); | |
226 | lapb_stop_t2timer(lapb); | |
227 | lapb_disconnect_confirmation(lapb, LAPB_NOTCONNECTED); | |
228 | } | |
229 | break; | |
1da177e4 | 230 | |
fcb261f3 JP |
231 | case LAPB_I: |
232 | case LAPB_REJ: | |
233 | case LAPB_RNR: | |
234 | case LAPB_RR: | |
a508da6c | 235 | lapb_dbg(1, "(%p) S2 RX {I,REJ,RNR,RR}(%d)\n", |
fcb261f3 | 236 | lapb->dev, frame->pf); |
a508da6c | 237 | lapb_dbg(1, "(%p) S2 RX DM(%d)\n", lapb->dev, frame->pf); |
fcb261f3 JP |
238 | if (frame->pf) |
239 | lapb_send_control(lapb, LAPB_DM, frame->pf, | |
240 | LAPB_RESPONSE); | |
241 | break; | |
1da177e4 LT |
242 | } |
243 | ||
244 | kfree_skb(skb); | |
245 | } | |
246 | ||
247 | /* | |
248 | * State machine for state 3, Connected State. | |
249 | * The handling of the timer(s) is in file lapb_timer.c | |
250 | */ | |
251 | static void lapb_state3_machine(struct lapb_cb *lapb, struct sk_buff *skb, | |
252 | struct lapb_frame *frame) | |
253 | { | |
254 | int queued = 0; | |
255 | int modulus = (lapb->mode & LAPB_EXTENDED) ? LAPB_EMODULUS : | |
256 | LAPB_SMODULUS; | |
257 | ||
258 | switch (frame->type) { | |
fcb261f3 | 259 | case LAPB_SABM: |
a508da6c | 260 | lapb_dbg(1, "(%p) S3 RX SABM(%d)\n", lapb->dev, frame->pf); |
fcb261f3 | 261 | if (lapb->mode & LAPB_EXTENDED) { |
a508da6c JP |
262 | lapb_dbg(1, "(%p) S3 TX DM(%d)\n", |
263 | lapb->dev, frame->pf); | |
fcb261f3 JP |
264 | lapb_send_control(lapb, LAPB_DM, frame->pf, |
265 | LAPB_RESPONSE); | |
266 | } else { | |
a508da6c JP |
267 | lapb_dbg(1, "(%p) S3 TX UA(%d)\n", |
268 | lapb->dev, frame->pf); | |
fcb261f3 JP |
269 | lapb_send_control(lapb, LAPB_UA, frame->pf, |
270 | LAPB_RESPONSE); | |
271 | lapb_stop_t1timer(lapb); | |
272 | lapb_stop_t2timer(lapb); | |
273 | lapb->condition = 0x00; | |
274 | lapb->n2count = 0; | |
275 | lapb->vs = 0; | |
276 | lapb->vr = 0; | |
277 | lapb->va = 0; | |
278 | lapb_requeue_frames(lapb); | |
279 | } | |
280 | break; | |
1da177e4 | 281 | |
fcb261f3 | 282 | case LAPB_SABME: |
a508da6c | 283 | lapb_dbg(1, "(%p) S3 RX SABME(%d)\n", lapb->dev, frame->pf); |
fcb261f3 | 284 | if (lapb->mode & LAPB_EXTENDED) { |
a508da6c JP |
285 | lapb_dbg(1, "(%p) S3 TX UA(%d)\n", |
286 | lapb->dev, frame->pf); | |
fcb261f3 JP |
287 | lapb_send_control(lapb, LAPB_UA, frame->pf, |
288 | LAPB_RESPONSE); | |
289 | lapb_stop_t1timer(lapb); | |
290 | lapb_stop_t2timer(lapb); | |
291 | lapb->condition = 0x00; | |
292 | lapb->n2count = 0; | |
293 | lapb->vs = 0; | |
294 | lapb->vr = 0; | |
295 | lapb->va = 0; | |
296 | lapb_requeue_frames(lapb); | |
297 | } else { | |
a508da6c JP |
298 | lapb_dbg(1, "(%p) S3 TX DM(%d)\n", |
299 | lapb->dev, frame->pf); | |
fcb261f3 JP |
300 | lapb_send_control(lapb, LAPB_DM, frame->pf, |
301 | LAPB_RESPONSE); | |
302 | } | |
303 | break; | |
1da177e4 | 304 | |
fcb261f3 | 305 | case LAPB_DISC: |
a508da6c JP |
306 | lapb_dbg(1, "(%p) S3 RX DISC(%d)\n", lapb->dev, frame->pf); |
307 | lapb_dbg(0, "(%p) S3 -> S0\n", lapb->dev); | |
fcb261f3 JP |
308 | lapb_clear_queues(lapb); |
309 | lapb_send_control(lapb, LAPB_UA, frame->pf, LAPB_RESPONSE); | |
310 | lapb_start_t1timer(lapb); | |
311 | lapb_stop_t2timer(lapb); | |
312 | lapb->state = LAPB_STATE_0; | |
313 | lapb_disconnect_indication(lapb, LAPB_OK); | |
314 | break; | |
1da177e4 | 315 | |
fcb261f3 | 316 | case LAPB_DM: |
a508da6c JP |
317 | lapb_dbg(1, "(%p) S3 RX DM(%d)\n", lapb->dev, frame->pf); |
318 | lapb_dbg(0, "(%p) S3 -> S0\n", lapb->dev); | |
fcb261f3 JP |
319 | lapb_clear_queues(lapb); |
320 | lapb->state = LAPB_STATE_0; | |
321 | lapb_start_t1timer(lapb); | |
322 | lapb_stop_t2timer(lapb); | |
323 | lapb_disconnect_indication(lapb, LAPB_NOTCONNECTED); | |
324 | break; | |
1da177e4 | 325 | |
fcb261f3 | 326 | case LAPB_RNR: |
a508da6c JP |
327 | lapb_dbg(1, "(%p) S3 RX RNR(%d) R%d\n", |
328 | lapb->dev, frame->pf, frame->nr); | |
fcb261f3 JP |
329 | lapb->condition |= LAPB_PEER_RX_BUSY_CONDITION; |
330 | lapb_check_need_response(lapb, frame->cr, frame->pf); | |
331 | if (lapb_validate_nr(lapb, frame->nr)) { | |
332 | lapb_check_iframes_acked(lapb, frame->nr); | |
333 | } else { | |
334 | lapb->frmr_data = *frame; | |
335 | lapb->frmr_type = LAPB_FRMR_Z; | |
336 | lapb_transmit_frmr(lapb); | |
a508da6c | 337 | lapb_dbg(0, "(%p) S3 -> S4\n", lapb->dev); |
fcb261f3 JP |
338 | lapb_start_t1timer(lapb); |
339 | lapb_stop_t2timer(lapb); | |
340 | lapb->state = LAPB_STATE_4; | |
341 | lapb->n2count = 0; | |
342 | } | |
343 | break; | |
1da177e4 | 344 | |
fcb261f3 | 345 | case LAPB_RR: |
a508da6c JP |
346 | lapb_dbg(1, "(%p) S3 RX RR(%d) R%d\n", |
347 | lapb->dev, frame->pf, frame->nr); | |
fcb261f3 JP |
348 | lapb->condition &= ~LAPB_PEER_RX_BUSY_CONDITION; |
349 | lapb_check_need_response(lapb, frame->cr, frame->pf); | |
350 | if (lapb_validate_nr(lapb, frame->nr)) { | |
351 | lapb_check_iframes_acked(lapb, frame->nr); | |
352 | } else { | |
353 | lapb->frmr_data = *frame; | |
354 | lapb->frmr_type = LAPB_FRMR_Z; | |
355 | lapb_transmit_frmr(lapb); | |
a508da6c | 356 | lapb_dbg(0, "(%p) S3 -> S4\n", lapb->dev); |
fcb261f3 JP |
357 | lapb_start_t1timer(lapb); |
358 | lapb_stop_t2timer(lapb); | |
359 | lapb->state = LAPB_STATE_4; | |
360 | lapb->n2count = 0; | |
361 | } | |
362 | break; | |
1da177e4 | 363 | |
fcb261f3 | 364 | case LAPB_REJ: |
a508da6c JP |
365 | lapb_dbg(1, "(%p) S3 RX REJ(%d) R%d\n", |
366 | lapb->dev, frame->pf, frame->nr); | |
fcb261f3 JP |
367 | lapb->condition &= ~LAPB_PEER_RX_BUSY_CONDITION; |
368 | lapb_check_need_response(lapb, frame->cr, frame->pf); | |
369 | if (lapb_validate_nr(lapb, frame->nr)) { | |
370 | lapb_frames_acked(lapb, frame->nr); | |
371 | lapb_stop_t1timer(lapb); | |
372 | lapb->n2count = 0; | |
373 | lapb_requeue_frames(lapb); | |
374 | } else { | |
375 | lapb->frmr_data = *frame; | |
376 | lapb->frmr_type = LAPB_FRMR_Z; | |
377 | lapb_transmit_frmr(lapb); | |
a508da6c | 378 | lapb_dbg(0, "(%p) S3 -> S4\n", lapb->dev); |
fcb261f3 JP |
379 | lapb_start_t1timer(lapb); |
380 | lapb_stop_t2timer(lapb); | |
381 | lapb->state = LAPB_STATE_4; | |
382 | lapb->n2count = 0; | |
383 | } | |
384 | break; | |
1da177e4 | 385 | |
fcb261f3 | 386 | case LAPB_I: |
a508da6c JP |
387 | lapb_dbg(1, "(%p) S3 RX I(%d) S%d R%d\n", |
388 | lapb->dev, frame->pf, frame->ns, frame->nr); | |
fcb261f3 JP |
389 | if (!lapb_validate_nr(lapb, frame->nr)) { |
390 | lapb->frmr_data = *frame; | |
391 | lapb->frmr_type = LAPB_FRMR_Z; | |
392 | lapb_transmit_frmr(lapb); | |
a508da6c | 393 | lapb_dbg(0, "(%p) S3 -> S4\n", lapb->dev); |
fcb261f3 JP |
394 | lapb_start_t1timer(lapb); |
395 | lapb_stop_t2timer(lapb); | |
396 | lapb->state = LAPB_STATE_4; | |
397 | lapb->n2count = 0; | |
398 | break; | |
399 | } | |
400 | if (lapb->condition & LAPB_PEER_RX_BUSY_CONDITION) | |
401 | lapb_frames_acked(lapb, frame->nr); | |
402 | else | |
403 | lapb_check_iframes_acked(lapb, frame->nr); | |
404 | ||
405 | if (frame->ns == lapb->vr) { | |
406 | int cn; | |
407 | cn = lapb_data_indication(lapb, skb); | |
408 | queued = 1; | |
409 | /* | |
410 | * If upper layer has dropped the frame, we | |
411 | * basically ignore any further protocol | |
412 | * processing. This will cause the peer | |
413 | * to re-transmit the frame later like | |
414 | * a frame lost on the wire. | |
415 | */ | |
416 | if (cn == NET_RX_DROP) { | |
a508da6c | 417 | pr_debug("rx congestion\n"); |
1da177e4 LT |
418 | break; |
419 | } | |
fcb261f3 JP |
420 | lapb->vr = (lapb->vr + 1) % modulus; |
421 | lapb->condition &= ~LAPB_REJECT_CONDITION; | |
422 | if (frame->pf) | |
423 | lapb_enquiry_response(lapb); | |
424 | else { | |
425 | if (!(lapb->condition & | |
426 | LAPB_ACK_PENDING_CONDITION)) { | |
427 | lapb->condition |= LAPB_ACK_PENDING_CONDITION; | |
428 | lapb_start_t2timer(lapb); | |
1da177e4 | 429 | } |
fcb261f3 JP |
430 | } |
431 | } else { | |
432 | if (lapb->condition & LAPB_REJECT_CONDITION) { | |
1da177e4 LT |
433 | if (frame->pf) |
434 | lapb_enquiry_response(lapb); | |
1da177e4 | 435 | } else { |
a508da6c JP |
436 | lapb_dbg(1, "(%p) S3 TX REJ(%d) R%d\n", |
437 | lapb->dev, frame->pf, lapb->vr); | |
fcb261f3 JP |
438 | lapb->condition |= LAPB_REJECT_CONDITION; |
439 | lapb_send_control(lapb, LAPB_REJ, frame->pf, | |
440 | LAPB_RESPONSE); | |
441 | lapb->condition &= ~LAPB_ACK_PENDING_CONDITION; | |
1da177e4 | 442 | } |
fcb261f3 JP |
443 | } |
444 | break; | |
1da177e4 | 445 | |
fcb261f3 | 446 | case LAPB_FRMR: |
a508da6c JP |
447 | lapb_dbg(1, "(%p) S3 RX FRMR(%d) %02X %02X %02X %02X %02X\n", |
448 | lapb->dev, frame->pf, | |
449 | skb->data[0], skb->data[1], skb->data[2], | |
450 | skb->data[3], skb->data[4]); | |
fcb261f3 | 451 | lapb_establish_data_link(lapb); |
a508da6c | 452 | lapb_dbg(0, "(%p) S3 -> S1\n", lapb->dev); |
fcb261f3 JP |
453 | lapb_requeue_frames(lapb); |
454 | lapb->state = LAPB_STATE_1; | |
455 | break; | |
1da177e4 | 456 | |
fcb261f3 | 457 | case LAPB_ILLEGAL: |
a508da6c | 458 | lapb_dbg(1, "(%p) S3 RX ILLEGAL(%d)\n", lapb->dev, frame->pf); |
fcb261f3 JP |
459 | lapb->frmr_data = *frame; |
460 | lapb->frmr_type = LAPB_FRMR_W; | |
461 | lapb_transmit_frmr(lapb); | |
a508da6c | 462 | lapb_dbg(0, "(%p) S3 -> S4\n", lapb->dev); |
fcb261f3 JP |
463 | lapb_start_t1timer(lapb); |
464 | lapb_stop_t2timer(lapb); | |
465 | lapb->state = LAPB_STATE_4; | |
466 | lapb->n2count = 0; | |
467 | break; | |
1da177e4 LT |
468 | } |
469 | ||
470 | if (!queued) | |
471 | kfree_skb(skb); | |
472 | } | |
473 | ||
474 | /* | |
475 | * State machine for state 4, Frame Reject State. | |
476 | * The handling of the timer(s) is in file lapb_timer.c. | |
477 | */ | |
478 | static void lapb_state4_machine(struct lapb_cb *lapb, struct sk_buff *skb, | |
479 | struct lapb_frame *frame) | |
480 | { | |
481 | switch (frame->type) { | |
fcb261f3 | 482 | case LAPB_SABM: |
a508da6c | 483 | lapb_dbg(1, "(%p) S4 RX SABM(%d)\n", lapb->dev, frame->pf); |
fcb261f3 | 484 | if (lapb->mode & LAPB_EXTENDED) { |
a508da6c JP |
485 | lapb_dbg(1, "(%p) S4 TX DM(%d)\n", |
486 | lapb->dev, frame->pf); | |
fcb261f3 JP |
487 | lapb_send_control(lapb, LAPB_DM, frame->pf, |
488 | LAPB_RESPONSE); | |
489 | } else { | |
a508da6c JP |
490 | lapb_dbg(1, "(%p) S4 TX UA(%d)\n", |
491 | lapb->dev, frame->pf); | |
492 | lapb_dbg(0, "(%p) S4 -> S3\n", lapb->dev); | |
fcb261f3 JP |
493 | lapb_send_control(lapb, LAPB_UA, frame->pf, |
494 | LAPB_RESPONSE); | |
495 | lapb_stop_t1timer(lapb); | |
496 | lapb_stop_t2timer(lapb); | |
497 | lapb->state = LAPB_STATE_3; | |
498 | lapb->condition = 0x00; | |
499 | lapb->n2count = 0; | |
500 | lapb->vs = 0; | |
501 | lapb->vr = 0; | |
502 | lapb->va = 0; | |
503 | lapb_connect_indication(lapb, LAPB_OK); | |
504 | } | |
505 | break; | |
1da177e4 | 506 | |
fcb261f3 | 507 | case LAPB_SABME: |
a508da6c | 508 | lapb_dbg(1, "(%p) S4 RX SABME(%d)\n", lapb->dev, frame->pf); |
fcb261f3 | 509 | if (lapb->mode & LAPB_EXTENDED) { |
a508da6c JP |
510 | lapb_dbg(1, "(%p) S4 TX UA(%d)\n", |
511 | lapb->dev, frame->pf); | |
512 | lapb_dbg(0, "(%p) S4 -> S3\n", lapb->dev); | |
fcb261f3 JP |
513 | lapb_send_control(lapb, LAPB_UA, frame->pf, |
514 | LAPB_RESPONSE); | |
515 | lapb_stop_t1timer(lapb); | |
516 | lapb_stop_t2timer(lapb); | |
517 | lapb->state = LAPB_STATE_3; | |
518 | lapb->condition = 0x00; | |
519 | lapb->n2count = 0; | |
520 | lapb->vs = 0; | |
521 | lapb->vr = 0; | |
522 | lapb->va = 0; | |
523 | lapb_connect_indication(lapb, LAPB_OK); | |
524 | } else { | |
a508da6c JP |
525 | lapb_dbg(1, "(%p) S4 TX DM(%d)\n", |
526 | lapb->dev, frame->pf); | |
fcb261f3 JP |
527 | lapb_send_control(lapb, LAPB_DM, frame->pf, |
528 | LAPB_RESPONSE); | |
529 | } | |
530 | break; | |
1da177e4 LT |
531 | } |
532 | ||
533 | kfree_skb(skb); | |
534 | } | |
535 | ||
536 | /* | |
537 | * Process an incoming LAPB frame | |
538 | */ | |
539 | void lapb_data_input(struct lapb_cb *lapb, struct sk_buff *skb) | |
540 | { | |
541 | struct lapb_frame frame; | |
542 | ||
543 | if (lapb_decode(lapb, skb, &frame) < 0) { | |
544 | kfree_skb(skb); | |
545 | return; | |
546 | } | |
547 | ||
548 | switch (lapb->state) { | |
549 | case LAPB_STATE_0: | |
550 | lapb_state0_machine(lapb, skb, &frame); break; | |
551 | case LAPB_STATE_1: | |
552 | lapb_state1_machine(lapb, skb, &frame); break; | |
553 | case LAPB_STATE_2: | |
554 | lapb_state2_machine(lapb, skb, &frame); break; | |
555 | case LAPB_STATE_3: | |
556 | lapb_state3_machine(lapb, skb, &frame); break; | |
557 | case LAPB_STATE_4: | |
558 | lapb_state4_machine(lapb, skb, &frame); break; | |
559 | } | |
560 | ||
561 | lapb_kick(lapb); | |
562 | } |