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1da177e4 LT |
1 | /********************************************************************* |
2 | * | |
3 | * Filename: irlap_frame.c | |
4 | * Version: 1.0 | |
5 | * Description: Build and transmit IrLAP frames | |
6 | * Status: Stable | |
7 | * Author: Dag Brattli <dagb@cs.uit.no> | |
8 | * Created at: Tue Aug 19 10:27:26 1997 | |
9 | * Modified at: Wed Jan 5 08:59:04 2000 | |
10 | * Modified by: Dag Brattli <dagb@cs.uit.no> | |
11 | * | |
12 | * Copyright (c) 1998-2000 Dag Brattli <dagb@cs.uit.no>, | |
13 | * All Rights Reserved. | |
14 | * Copyright (c) 2000-2003 Jean Tourrilhes <jt@hpl.hp.com> | |
15 | * | |
16 | * This program is free software; you can redistribute it and/or | |
17 | * modify it under the terms of the GNU General Public License as | |
18 | * published by the Free Software Foundation; either version 2 of | |
19 | * the License, or (at your option) any later version. | |
20 | * | |
96de0e25 | 21 | * Neither Dag Brattli nor University of Tromsø admit liability nor |
1da177e4 LT |
22 | * provide warranty for any of this software. This material is |
23 | * provided "AS-IS" and at no charge. | |
24 | * | |
25 | ********************************************************************/ | |
26 | ||
27 | #include <linux/skbuff.h> | |
28 | #include <linux/if.h> | |
29 | #include <linux/if_ether.h> | |
30 | #include <linux/netdevice.h> | |
31 | #include <linux/irda.h> | |
32 | ||
33 | #include <net/pkt_sched.h> | |
34 | #include <net/sock.h> | |
35 | ||
36 | #include <asm/byteorder.h> | |
37 | ||
38 | #include <net/irda/irda.h> | |
39 | #include <net/irda/irda_device.h> | |
40 | #include <net/irda/irlap.h> | |
41 | #include <net/irda/wrapper.h> | |
42 | #include <net/irda/timer.h> | |
43 | #include <net/irda/irlap_frame.h> | |
44 | #include <net/irda/qos.h> | |
45 | ||
46 | static void irlap_send_i_frame(struct irlap_cb *self, struct sk_buff *skb, | |
47 | int command); | |
48 | ||
49 | /* | |
50 | * Function irlap_insert_info (self, skb) | |
51 | * | |
52 | * Insert minimum turnaround time and speed information into the skb. We | |
53 | * need to do this since it's per packet relevant information. Safe to | |
54 | * have this function inlined since it's only called from one place | |
55 | */ | |
56 | static inline void irlap_insert_info(struct irlap_cb *self, | |
57 | struct sk_buff *skb) | |
58 | { | |
59 | struct irda_skb_cb *cb = (struct irda_skb_cb *) skb->cb; | |
60 | ||
61 | /* | |
62 | * Insert MTT (min. turn time) and speed into skb, so that the | |
63 | * device driver knows which settings to use | |
64 | */ | |
65 | cb->magic = LAP_MAGIC; | |
66 | cb->mtt = self->mtt_required; | |
67 | cb->next_speed = self->speed; | |
68 | ||
69 | /* Reset */ | |
70 | self->mtt_required = 0; | |
71 | ||
72 | /* | |
73 | * Delay equals negotiated BOFs count, plus the number of BOFs to | |
74 | * force the negotiated minimum turnaround time | |
75 | */ | |
76 | cb->xbofs = self->bofs_count; | |
77 | cb->next_xbofs = self->next_bofs; | |
78 | cb->xbofs_delay = self->xbofs_delay; | |
79 | ||
80 | /* Reset XBOF's delay (used only for getting min turn time) */ | |
81 | self->xbofs_delay = 0; | |
82 | /* Put the correct xbofs value for the next packet */ | |
83 | self->bofs_count = self->next_bofs; | |
84 | } | |
85 | ||
86 | /* | |
87 | * Function irlap_queue_xmit (self, skb) | |
88 | * | |
89 | * A little wrapper for dev_queue_xmit, so we can insert some common | |
90 | * code into it. | |
91 | */ | |
92 | void irlap_queue_xmit(struct irlap_cb *self, struct sk_buff *skb) | |
93 | { | |
94 | /* Some common init stuff */ | |
95 | skb->dev = self->netdev; | |
459a98ed | 96 | skb_reset_mac_header(skb); |
c1d2bbe1 | 97 | skb_reset_network_header(skb); |
badff6d0 | 98 | skb_reset_transport_header(skb); |
1da177e4 LT |
99 | skb->protocol = htons(ETH_P_IRDA); |
100 | skb->priority = TC_PRIO_BESTEFFORT; | |
101 | ||
102 | irlap_insert_info(self, skb); | |
103 | ||
41172528 SO |
104 | if (unlikely(self->mode & IRDA_MODE_MONITOR)) { |
105 | IRDA_DEBUG(3, "%s(): %s is in monitor mode\n", __FUNCTION__, | |
106 | self->netdev->name); | |
107 | dev_kfree_skb(skb); | |
108 | return; | |
109 | } | |
110 | ||
1da177e4 LT |
111 | dev_queue_xmit(skb); |
112 | } | |
113 | ||
114 | /* | |
115 | * Function irlap_send_snrm_cmd (void) | |
116 | * | |
117 | * Transmits a connect SNRM command frame | |
118 | */ | |
119 | void irlap_send_snrm_frame(struct irlap_cb *self, struct qos_info *qos) | |
120 | { | |
121 | struct sk_buff *tx_skb; | |
122 | struct snrm_frame *frame; | |
123 | int ret; | |
124 | ||
125 | IRDA_ASSERT(self != NULL, return;); | |
126 | IRDA_ASSERT(self->magic == LAP_MAGIC, return;); | |
127 | ||
128 | /* Allocate frame */ | |
1b0fee7d SO |
129 | tx_skb = alloc_skb(sizeof(struct snrm_frame) + |
130 | IRLAP_NEGOCIATION_PARAMS_LEN, | |
131 | GFP_ATOMIC); | |
1da177e4 LT |
132 | if (!tx_skb) |
133 | return; | |
134 | ||
135 | frame = (struct snrm_frame *) skb_put(tx_skb, 2); | |
136 | ||
137 | /* Insert connection address field */ | |
138 | if (qos) | |
139 | frame->caddr = CMD_FRAME | CBROADCAST; | |
140 | else | |
141 | frame->caddr = CMD_FRAME | self->caddr; | |
142 | ||
143 | /* Insert control field */ | |
144 | frame->control = SNRM_CMD | PF_BIT; | |
145 | ||
146 | /* | |
cc53ded2 | 147 | * If we are establishing a connection then insert QoS parameters |
1da177e4 LT |
148 | */ |
149 | if (qos) { | |
1b0fee7d | 150 | skb_put(tx_skb, 9); /* 25 left */ |
1da177e4 LT |
151 | frame->saddr = cpu_to_le32(self->saddr); |
152 | frame->daddr = cpu_to_le32(self->daddr); | |
153 | ||
154 | frame->ncaddr = self->caddr; | |
155 | ||
156 | ret = irlap_insert_qos_negotiation_params(self, tx_skb); | |
157 | if (ret < 0) { | |
158 | dev_kfree_skb(tx_skb); | |
159 | return; | |
160 | } | |
161 | } | |
162 | irlap_queue_xmit(self, tx_skb); | |
163 | } | |
164 | ||
165 | /* | |
166 | * Function irlap_recv_snrm_cmd (skb, info) | |
167 | * | |
168 | * Received SNRM (Set Normal Response Mode) command frame | |
169 | * | |
170 | */ | |
171 | static void irlap_recv_snrm_cmd(struct irlap_cb *self, struct sk_buff *skb, | |
172 | struct irlap_info *info) | |
173 | { | |
174 | struct snrm_frame *frame; | |
175 | ||
176 | if (pskb_may_pull(skb,sizeof(struct snrm_frame))) { | |
177 | frame = (struct snrm_frame *) skb->data; | |
178 | ||
179 | /* Copy the new connection address ignoring the C/R bit */ | |
180 | info->caddr = frame->ncaddr & 0xFE; | |
181 | ||
182 | /* Check if the new connection address is valid */ | |
183 | if ((info->caddr == 0x00) || (info->caddr == 0xfe)) { | |
184 | IRDA_DEBUG(3, "%s(), invalid connection address!\n", | |
185 | __FUNCTION__); | |
186 | return; | |
187 | } | |
188 | ||
189 | /* Copy peer device address */ | |
190 | info->daddr = le32_to_cpu(frame->saddr); | |
191 | info->saddr = le32_to_cpu(frame->daddr); | |
192 | ||
193 | /* Only accept if addressed directly to us */ | |
194 | if (info->saddr != self->saddr) { | |
195 | IRDA_DEBUG(2, "%s(), not addressed to us!\n", | |
196 | __FUNCTION__); | |
197 | return; | |
198 | } | |
199 | irlap_do_event(self, RECV_SNRM_CMD, skb, info); | |
200 | } else { | |
201 | /* Signal that this SNRM frame does not contain and I-field */ | |
202 | irlap_do_event(self, RECV_SNRM_CMD, skb, NULL); | |
203 | } | |
204 | } | |
205 | ||
206 | /* | |
207 | * Function irlap_send_ua_response_frame (qos) | |
208 | * | |
209 | * Send UA (Unnumbered Acknowledgement) frame | |
210 | * | |
211 | */ | |
212 | void irlap_send_ua_response_frame(struct irlap_cb *self, struct qos_info *qos) | |
213 | { | |
214 | struct sk_buff *tx_skb; | |
215 | struct ua_frame *frame; | |
216 | int ret; | |
217 | ||
218 | IRDA_DEBUG(2, "%s() <%ld>\n", __FUNCTION__, jiffies); | |
219 | ||
220 | IRDA_ASSERT(self != NULL, return;); | |
221 | IRDA_ASSERT(self->magic == LAP_MAGIC, return;); | |
222 | ||
223 | /* Allocate frame */ | |
1b0fee7d SO |
224 | tx_skb = alloc_skb(sizeof(struct ua_frame) + |
225 | IRLAP_NEGOCIATION_PARAMS_LEN, | |
226 | GFP_ATOMIC); | |
1da177e4 LT |
227 | if (!tx_skb) |
228 | return; | |
229 | ||
230 | frame = (struct ua_frame *) skb_put(tx_skb, 10); | |
231 | ||
232 | /* Build UA response */ | |
233 | frame->caddr = self->caddr; | |
234 | frame->control = UA_RSP | PF_BIT; | |
235 | ||
236 | frame->saddr = cpu_to_le32(self->saddr); | |
237 | frame->daddr = cpu_to_le32(self->daddr); | |
238 | ||
239 | /* Should we send QoS negotiation parameters? */ | |
240 | if (qos) { | |
241 | ret = irlap_insert_qos_negotiation_params(self, tx_skb); | |
242 | if (ret < 0) { | |
243 | dev_kfree_skb(tx_skb); | |
244 | return; | |
245 | } | |
246 | } | |
247 | ||
248 | irlap_queue_xmit(self, tx_skb); | |
249 | } | |
250 | ||
251 | ||
252 | /* | |
253 | * Function irlap_send_dm_frame (void) | |
254 | * | |
255 | * Send disconnected mode (DM) frame | |
256 | * | |
257 | */ | |
258 | void irlap_send_dm_frame( struct irlap_cb *self) | |
259 | { | |
260 | struct sk_buff *tx_skb = NULL; | |
1b0fee7d | 261 | struct dm_frame *frame; |
1da177e4 LT |
262 | |
263 | IRDA_ASSERT(self != NULL, return;); | |
264 | IRDA_ASSERT(self->magic == LAP_MAGIC, return;); | |
265 | ||
1b0fee7d | 266 | tx_skb = alloc_skb(sizeof(struct dm_frame), GFP_ATOMIC); |
1da177e4 LT |
267 | if (!tx_skb) |
268 | return; | |
269 | ||
1b0fee7d | 270 | frame = (struct dm_frame *)skb_put(tx_skb, 2); |
1da177e4 LT |
271 | |
272 | if (self->state == LAP_NDM) | |
1b0fee7d | 273 | frame->caddr = CBROADCAST; |
1da177e4 | 274 | else |
1b0fee7d | 275 | frame->caddr = self->caddr; |
1da177e4 | 276 | |
1b0fee7d | 277 | frame->control = DM_RSP | PF_BIT; |
1da177e4 LT |
278 | |
279 | irlap_queue_xmit(self, tx_skb); | |
280 | } | |
281 | ||
282 | /* | |
283 | * Function irlap_send_disc_frame (void) | |
284 | * | |
285 | * Send disconnect (DISC) frame | |
286 | * | |
287 | */ | |
288 | void irlap_send_disc_frame(struct irlap_cb *self) | |
289 | { | |
290 | struct sk_buff *tx_skb = NULL; | |
1b0fee7d | 291 | struct disc_frame *frame; |
1da177e4 LT |
292 | |
293 | IRDA_DEBUG(3, "%s()\n", __FUNCTION__); | |
294 | ||
295 | IRDA_ASSERT(self != NULL, return;); | |
296 | IRDA_ASSERT(self->magic == LAP_MAGIC, return;); | |
297 | ||
1b0fee7d | 298 | tx_skb = alloc_skb(sizeof(struct disc_frame), GFP_ATOMIC); |
1da177e4 LT |
299 | if (!tx_skb) |
300 | return; | |
301 | ||
1b0fee7d | 302 | frame = (struct disc_frame *)skb_put(tx_skb, 2); |
1da177e4 | 303 | |
1b0fee7d SO |
304 | frame->caddr = self->caddr | CMD_FRAME; |
305 | frame->control = DISC_CMD | PF_BIT; | |
1da177e4 LT |
306 | |
307 | irlap_queue_xmit(self, tx_skb); | |
308 | } | |
309 | ||
310 | /* | |
311 | * Function irlap_send_discovery_xid_frame (S, s, command) | |
312 | * | |
313 | * Build and transmit a XID (eXchange station IDentifier) discovery | |
314 | * frame. | |
315 | */ | |
316 | void irlap_send_discovery_xid_frame(struct irlap_cb *self, int S, __u8 s, | |
317 | __u8 command, discovery_t *discovery) | |
318 | { | |
319 | struct sk_buff *tx_skb = NULL; | |
320 | struct xid_frame *frame; | |
321 | __u32 bcast = BROADCAST; | |
322 | __u8 *info; | |
323 | ||
324 | IRDA_DEBUG(4, "%s(), s=%d, S=%d, command=%d\n", __FUNCTION__, | |
325 | s, S, command); | |
326 | ||
327 | IRDA_ASSERT(self != NULL, return;); | |
328 | IRDA_ASSERT(self->magic == LAP_MAGIC, return;); | |
329 | IRDA_ASSERT(discovery != NULL, return;); | |
330 | ||
1b0fee7d SO |
331 | tx_skb = alloc_skb(sizeof(struct xid_frame) + IRLAP_DISCOVERY_INFO_LEN, |
332 | GFP_ATOMIC); | |
1da177e4 LT |
333 | if (!tx_skb) |
334 | return; | |
335 | ||
336 | skb_put(tx_skb, 14); | |
337 | frame = (struct xid_frame *) tx_skb->data; | |
338 | ||
339 | if (command) { | |
340 | frame->caddr = CBROADCAST | CMD_FRAME; | |
341 | frame->control = XID_CMD | PF_BIT; | |
342 | } else { | |
343 | frame->caddr = CBROADCAST; | |
344 | frame->control = XID_RSP | PF_BIT; | |
345 | } | |
346 | frame->ident = XID_FORMAT; | |
347 | ||
348 | frame->saddr = cpu_to_le32(self->saddr); | |
349 | ||
350 | if (command) | |
351 | frame->daddr = cpu_to_le32(bcast); | |
352 | else | |
353 | frame->daddr = cpu_to_le32(discovery->data.daddr); | |
354 | ||
355 | switch (S) { | |
356 | case 1: | |
357 | frame->flags = 0x00; | |
358 | break; | |
359 | case 6: | |
360 | frame->flags = 0x01; | |
361 | break; | |
362 | case 8: | |
363 | frame->flags = 0x02; | |
364 | break; | |
365 | case 16: | |
366 | frame->flags = 0x03; | |
367 | break; | |
368 | default: | |
369 | frame->flags = 0x02; | |
370 | break; | |
371 | } | |
372 | ||
373 | frame->slotnr = s; | |
374 | frame->version = 0x00; | |
375 | ||
376 | /* | |
377 | * Provide info for final slot only in commands, and for all | |
378 | * responses. Send the second byte of the hint only if the | |
379 | * EXTENSION bit is set in the first byte. | |
380 | */ | |
381 | if (!command || (frame->slotnr == 0xff)) { | |
382 | int len; | |
383 | ||
384 | if (discovery->data.hints[0] & HINT_EXTENSION) { | |
385 | info = skb_put(tx_skb, 2); | |
386 | info[0] = discovery->data.hints[0]; | |
387 | info[1] = discovery->data.hints[1]; | |
388 | } else { | |
389 | info = skb_put(tx_skb, 1); | |
390 | info[0] = discovery->data.hints[0]; | |
391 | } | |
392 | info = skb_put(tx_skb, 1); | |
393 | info[0] = discovery->data.charset; | |
394 | ||
395 | len = IRDA_MIN(discovery->name_len, skb_tailroom(tx_skb)); | |
396 | info = skb_put(tx_skb, len); | |
397 | memcpy(info, discovery->data.info, len); | |
398 | } | |
399 | irlap_queue_xmit(self, tx_skb); | |
400 | } | |
401 | ||
402 | /* | |
403 | * Function irlap_recv_discovery_xid_rsp (skb, info) | |
404 | * | |
405 | * Received a XID discovery response | |
406 | * | |
407 | */ | |
408 | static void irlap_recv_discovery_xid_rsp(struct irlap_cb *self, | |
409 | struct sk_buff *skb, | |
410 | struct irlap_info *info) | |
411 | { | |
412 | struct xid_frame *xid; | |
413 | discovery_t *discovery = NULL; | |
414 | __u8 *discovery_info; | |
415 | char *text; | |
416 | ||
417 | IRDA_DEBUG(4, "%s()\n", __FUNCTION__); | |
418 | ||
419 | IRDA_ASSERT(self != NULL, return;); | |
420 | IRDA_ASSERT(self->magic == LAP_MAGIC, return;); | |
421 | ||
422 | if (!pskb_may_pull(skb, sizeof(struct xid_frame))) { | |
b450777a | 423 | IRDA_ERROR("%s: frame too short!\n", __FUNCTION__); |
1da177e4 LT |
424 | return; |
425 | } | |
6819bc2e | 426 | |
1da177e4 LT |
427 | xid = (struct xid_frame *) skb->data; |
428 | ||
429 | info->daddr = le32_to_cpu(xid->saddr); | |
430 | info->saddr = le32_to_cpu(xid->daddr); | |
431 | ||
432 | /* Make sure frame is addressed to us */ | |
433 | if ((info->saddr != self->saddr) && (info->saddr != BROADCAST)) { | |
434 | IRDA_DEBUG(0, "%s(), frame is not addressed to us!\n", | |
435 | __FUNCTION__); | |
436 | return; | |
437 | } | |
438 | ||
0da974f4 | 439 | if ((discovery = kzalloc(sizeof(discovery_t), GFP_ATOMIC)) == NULL) { |
1da177e4 LT |
440 | IRDA_WARNING("%s: kmalloc failed!\n", __FUNCTION__); |
441 | return; | |
442 | } | |
1da177e4 LT |
443 | |
444 | discovery->data.daddr = info->daddr; | |
445 | discovery->data.saddr = self->saddr; | |
446 | discovery->timestamp = jiffies; | |
447 | ||
448 | IRDA_DEBUG(4, "%s(), daddr=%08x\n", __FUNCTION__, | |
449 | discovery->data.daddr); | |
450 | ||
451 | discovery_info = skb_pull(skb, sizeof(struct xid_frame)); | |
452 | ||
453 | /* Get info returned from peer */ | |
454 | discovery->data.hints[0] = discovery_info[0]; | |
455 | if (discovery_info[0] & HINT_EXTENSION) { | |
456 | IRDA_DEBUG(4, "EXTENSION\n"); | |
457 | discovery->data.hints[1] = discovery_info[1]; | |
458 | discovery->data.charset = discovery_info[2]; | |
459 | text = (char *) &discovery_info[3]; | |
460 | } else { | |
461 | discovery->data.hints[1] = 0; | |
462 | discovery->data.charset = discovery_info[1]; | |
463 | text = (char *) &discovery_info[2]; | |
464 | } | |
465 | /* | |
466 | * Terminate info string, should be safe since this is where the | |
467 | * FCS bytes resides. | |
468 | */ | |
469 | skb->data[skb->len] = '\0'; | |
470 | strncpy(discovery->data.info, text, NICKNAME_MAX_LEN); | |
471 | discovery->name_len = strlen(discovery->data.info); | |
472 | ||
473 | info->discovery = discovery; | |
474 | ||
475 | irlap_do_event(self, RECV_DISCOVERY_XID_RSP, skb, info); | |
476 | } | |
477 | ||
478 | /* | |
479 | * Function irlap_recv_discovery_xid_cmd (skb, info) | |
480 | * | |
481 | * Received a XID discovery command | |
482 | * | |
483 | */ | |
484 | static void irlap_recv_discovery_xid_cmd(struct irlap_cb *self, | |
485 | struct sk_buff *skb, | |
486 | struct irlap_info *info) | |
487 | { | |
488 | struct xid_frame *xid; | |
489 | discovery_t *discovery = NULL; | |
490 | __u8 *discovery_info; | |
491 | char *text; | |
492 | ||
493 | if (!pskb_may_pull(skb, sizeof(struct xid_frame))) { | |
b450777a | 494 | IRDA_ERROR("%s: frame too short!\n", __FUNCTION__); |
1da177e4 LT |
495 | return; |
496 | } | |
6819bc2e | 497 | |
1da177e4 LT |
498 | xid = (struct xid_frame *) skb->data; |
499 | ||
500 | info->daddr = le32_to_cpu(xid->saddr); | |
501 | info->saddr = le32_to_cpu(xid->daddr); | |
502 | ||
503 | /* Make sure frame is addressed to us */ | |
504 | if ((info->saddr != self->saddr) && (info->saddr != BROADCAST)) { | |
505 | IRDA_DEBUG(0, "%s(), frame is not addressed to us!\n", | |
506 | __FUNCTION__); | |
507 | return; | |
508 | } | |
509 | ||
510 | switch (xid->flags & 0x03) { | |
511 | case 0x00: | |
512 | info->S = 1; | |
513 | break; | |
514 | case 0x01: | |
515 | info->S = 6; | |
516 | break; | |
517 | case 0x02: | |
518 | info->S = 8; | |
519 | break; | |
520 | case 0x03: | |
521 | info->S = 16; | |
522 | break; | |
523 | default: | |
524 | /* Error!! */ | |
525 | return; | |
526 | } | |
527 | info->s = xid->slotnr; | |
528 | ||
529 | discovery_info = skb_pull(skb, sizeof(struct xid_frame)); | |
530 | ||
531 | /* | |
532 | * Check if last frame | |
533 | */ | |
534 | if (info->s == 0xff) { | |
535 | /* Check if things are sane at this point... */ | |
6819bc2e | 536 | if((discovery_info == NULL) || |
1da177e4 | 537 | !pskb_may_pull(skb, 3)) { |
b450777a | 538 | IRDA_ERROR("%s: discovery frame too short!\n", |
1da177e4 LT |
539 | __FUNCTION__); |
540 | return; | |
541 | } | |
542 | ||
543 | /* | |
544 | * We now have some discovery info to deliver! | |
545 | */ | |
546 | discovery = kmalloc(sizeof(discovery_t), GFP_ATOMIC); | |
547 | if (!discovery) { | |
548 | IRDA_WARNING("%s: unable to malloc!\n", __FUNCTION__); | |
549 | return; | |
550 | } | |
551 | ||
552 | discovery->data.daddr = info->daddr; | |
553 | discovery->data.saddr = self->saddr; | |
554 | discovery->timestamp = jiffies; | |
555 | ||
556 | discovery->data.hints[0] = discovery_info[0]; | |
557 | if (discovery_info[0] & HINT_EXTENSION) { | |
558 | discovery->data.hints[1] = discovery_info[1]; | |
559 | discovery->data.charset = discovery_info[2]; | |
560 | text = (char *) &discovery_info[3]; | |
561 | } else { | |
562 | discovery->data.hints[1] = 0; | |
563 | discovery->data.charset = discovery_info[1]; | |
564 | text = (char *) &discovery_info[2]; | |
565 | } | |
566 | /* | |
567 | * Terminate string, should be safe since this is where the | |
568 | * FCS bytes resides. | |
569 | */ | |
570 | skb->data[skb->len] = '\0'; | |
571 | strncpy(discovery->data.info, text, NICKNAME_MAX_LEN); | |
572 | discovery->name_len = strlen(discovery->data.info); | |
573 | ||
574 | info->discovery = discovery; | |
575 | } else | |
576 | info->discovery = NULL; | |
577 | ||
578 | irlap_do_event(self, RECV_DISCOVERY_XID_CMD, skb, info); | |
579 | } | |
580 | ||
581 | /* | |
582 | * Function irlap_send_rr_frame (self, command) | |
583 | * | |
584 | * Build and transmit RR (Receive Ready) frame. Notice that it is currently | |
585 | * only possible to send RR frames with the poll bit set. | |
586 | */ | |
587 | void irlap_send_rr_frame(struct irlap_cb *self, int command) | |
588 | { | |
589 | struct sk_buff *tx_skb; | |
1b0fee7d | 590 | struct rr_frame *frame; |
1da177e4 | 591 | |
1b0fee7d | 592 | tx_skb = alloc_skb(sizeof(struct rr_frame), GFP_ATOMIC); |
1da177e4 LT |
593 | if (!tx_skb) |
594 | return; | |
595 | ||
1b0fee7d | 596 | frame = (struct rr_frame *)skb_put(tx_skb, 2); |
1da177e4 | 597 | |
1b0fee7d SO |
598 | frame->caddr = self->caddr; |
599 | frame->caddr |= (command) ? CMD_FRAME : 0; | |
1da177e4 | 600 | |
1b0fee7d | 601 | frame->control = RR | PF_BIT | (self->vr << 5); |
1da177e4 LT |
602 | |
603 | irlap_queue_xmit(self, tx_skb); | |
604 | } | |
605 | ||
606 | /* | |
607 | * Function irlap_send_rd_frame (self) | |
608 | * | |
609 | * Request disconnect. Used by a secondary station to request the | |
610 | * disconnection of the link. | |
611 | */ | |
612 | void irlap_send_rd_frame(struct irlap_cb *self) | |
613 | { | |
614 | struct sk_buff *tx_skb; | |
1b0fee7d | 615 | struct rd_frame *frame; |
1da177e4 | 616 | |
1b0fee7d | 617 | tx_skb = alloc_skb(sizeof(struct rd_frame), GFP_ATOMIC); |
1da177e4 LT |
618 | if (!tx_skb) |
619 | return; | |
620 | ||
1b0fee7d | 621 | frame = (struct rd_frame *)skb_put(tx_skb, 2); |
1da177e4 | 622 | |
1b0fee7d SO |
623 | frame->caddr = self->caddr; |
624 | frame->caddr = RD_RSP | PF_BIT; | |
1da177e4 LT |
625 | |
626 | irlap_queue_xmit(self, tx_skb); | |
627 | } | |
628 | ||
629 | /* | |
630 | * Function irlap_recv_rr_frame (skb, info) | |
631 | * | |
632 | * Received RR (Receive Ready) frame from peer station, no harm in | |
633 | * making it inline since its called only from one single place | |
634 | * (irlap_driver_rcv). | |
635 | */ | |
636 | static inline void irlap_recv_rr_frame(struct irlap_cb *self, | |
637 | struct sk_buff *skb, | |
638 | struct irlap_info *info, int command) | |
639 | { | |
640 | info->nr = skb->data[1] >> 5; | |
641 | ||
642 | /* Check if this is a command or a response frame */ | |
643 | if (command) | |
644 | irlap_do_event(self, RECV_RR_CMD, skb, info); | |
645 | else | |
646 | irlap_do_event(self, RECV_RR_RSP, skb, info); | |
647 | } | |
648 | ||
649 | /* | |
650 | * Function irlap_recv_rnr_frame (self, skb, info) | |
651 | * | |
652 | * Received RNR (Receive Not Ready) frame from peer station | |
653 | * | |
654 | */ | |
655 | static void irlap_recv_rnr_frame(struct irlap_cb *self, struct sk_buff *skb, | |
656 | struct irlap_info *info, int command) | |
657 | { | |
658 | info->nr = skb->data[1] >> 5; | |
659 | ||
660 | IRDA_DEBUG(4, "%s(), nr=%d, %ld\n", __FUNCTION__, info->nr, jiffies); | |
661 | ||
662 | if (command) | |
663 | irlap_do_event(self, RECV_RNR_CMD, skb, info); | |
664 | else | |
665 | irlap_do_event(self, RECV_RNR_RSP, skb, info); | |
666 | } | |
667 | ||
668 | static void irlap_recv_rej_frame(struct irlap_cb *self, struct sk_buff *skb, | |
669 | struct irlap_info *info, int command) | |
670 | { | |
671 | IRDA_DEBUG(0, "%s()\n", __FUNCTION__); | |
672 | ||
673 | info->nr = skb->data[1] >> 5; | |
674 | ||
675 | /* Check if this is a command or a response frame */ | |
676 | if (command) | |
677 | irlap_do_event(self, RECV_REJ_CMD, skb, info); | |
678 | else | |
679 | irlap_do_event(self, RECV_REJ_RSP, skb, info); | |
680 | } | |
681 | ||
682 | static void irlap_recv_srej_frame(struct irlap_cb *self, struct sk_buff *skb, | |
683 | struct irlap_info *info, int command) | |
684 | { | |
685 | IRDA_DEBUG(0, "%s()\n", __FUNCTION__); | |
686 | ||
687 | info->nr = skb->data[1] >> 5; | |
688 | ||
689 | /* Check if this is a command or a response frame */ | |
690 | if (command) | |
691 | irlap_do_event(self, RECV_SREJ_CMD, skb, info); | |
692 | else | |
693 | irlap_do_event(self, RECV_SREJ_RSP, skb, info); | |
694 | } | |
695 | ||
696 | static void irlap_recv_disc_frame(struct irlap_cb *self, struct sk_buff *skb, | |
697 | struct irlap_info *info, int command) | |
698 | { | |
699 | IRDA_DEBUG(2, "%s()\n", __FUNCTION__); | |
700 | ||
701 | /* Check if this is a command or a response frame */ | |
702 | if (command) | |
703 | irlap_do_event(self, RECV_DISC_CMD, skb, info); | |
704 | else | |
705 | irlap_do_event(self, RECV_RD_RSP, skb, info); | |
706 | } | |
707 | ||
708 | /* | |
709 | * Function irlap_recv_ua_frame (skb, frame) | |
710 | * | |
711 | * Received UA (Unnumbered Acknowledgement) frame | |
712 | * | |
713 | */ | |
714 | static inline void irlap_recv_ua_frame(struct irlap_cb *self, | |
715 | struct sk_buff *skb, | |
716 | struct irlap_info *info) | |
717 | { | |
718 | irlap_do_event(self, RECV_UA_RSP, skb, info); | |
719 | } | |
720 | ||
721 | /* | |
722 | * Function irlap_send_data_primary(self, skb) | |
723 | * | |
724 | * Send I-frames as the primary station but without the poll bit set | |
725 | * | |
726 | */ | |
727 | void irlap_send_data_primary(struct irlap_cb *self, struct sk_buff *skb) | |
728 | { | |
729 | struct sk_buff *tx_skb; | |
730 | ||
731 | if (skb->data[1] == I_FRAME) { | |
732 | ||
733 | /* | |
734 | * Insert frame sequence number (Vs) in control field before | |
735 | * inserting into transmit window queue. | |
736 | */ | |
737 | skb->data[1] = I_FRAME | (self->vs << 1); | |
738 | ||
739 | /* | |
740 | * Insert frame in store, in case of retransmissions | |
741 | * Increase skb reference count, see irlap_do_event() | |
742 | */ | |
743 | skb_get(skb); | |
744 | skb_queue_tail(&self->wx_list, skb); | |
745 | ||
746 | /* Copy buffer */ | |
747 | tx_skb = skb_clone(skb, GFP_ATOMIC); | |
748 | if (tx_skb == NULL) { | |
749 | return; | |
750 | } | |
751 | ||
752 | self->vs = (self->vs + 1) % 8; | |
753 | self->ack_required = FALSE; | |
754 | self->window -= 1; | |
755 | ||
756 | irlap_send_i_frame( self, tx_skb, CMD_FRAME); | |
757 | } else { | |
758 | IRDA_DEBUG(4, "%s(), sending unreliable frame\n", __FUNCTION__); | |
759 | irlap_send_ui_frame(self, skb_get(skb), self->caddr, CMD_FRAME); | |
760 | self->window -= 1; | |
761 | } | |
762 | } | |
763 | /* | |
764 | * Function irlap_send_data_primary_poll (self, skb) | |
765 | * | |
766 | * Send I(nformation) frame as primary with poll bit set | |
767 | */ | |
768 | void irlap_send_data_primary_poll(struct irlap_cb *self, struct sk_buff *skb) | |
769 | { | |
770 | struct sk_buff *tx_skb; | |
771 | int transmission_time; | |
772 | ||
773 | /* Stop P timer */ | |
774 | del_timer(&self->poll_timer); | |
775 | ||
776 | /* Is this reliable or unreliable data? */ | |
777 | if (skb->data[1] == I_FRAME) { | |
778 | ||
779 | /* | |
780 | * Insert frame sequence number (Vs) in control field before | |
781 | * inserting into transmit window queue. | |
782 | */ | |
783 | skb->data[1] = I_FRAME | (self->vs << 1); | |
784 | ||
785 | /* | |
786 | * Insert frame in store, in case of retransmissions | |
787 | * Increase skb reference count, see irlap_do_event() | |
788 | */ | |
789 | skb_get(skb); | |
790 | skb_queue_tail(&self->wx_list, skb); | |
791 | ||
792 | /* Copy buffer */ | |
793 | tx_skb = skb_clone(skb, GFP_ATOMIC); | |
794 | if (tx_skb == NULL) { | |
795 | return; | |
796 | } | |
797 | ||
798 | /* | |
799 | * Set poll bit if necessary. We do this to the copied | |
800 | * skb, since retransmitted need to set or clear the poll | |
801 | * bit depending on when they are sent. | |
802 | */ | |
803 | tx_skb->data[1] |= PF_BIT; | |
804 | ||
805 | self->vs = (self->vs + 1) % 8; | |
806 | self->ack_required = FALSE; | |
807 | ||
c0cfe7fa | 808 | irlap_next_state(self, LAP_NRM_P); |
1da177e4 LT |
809 | irlap_send_i_frame(self, tx_skb, CMD_FRAME); |
810 | } else { | |
811 | IRDA_DEBUG(4, "%s(), sending unreliable frame\n", __FUNCTION__); | |
812 | ||
813 | if (self->ack_required) { | |
814 | irlap_send_ui_frame(self, skb_get(skb), self->caddr, CMD_FRAME); | |
c0cfe7fa | 815 | irlap_next_state(self, LAP_NRM_P); |
1da177e4 LT |
816 | irlap_send_rr_frame(self, CMD_FRAME); |
817 | self->ack_required = FALSE; | |
818 | } else { | |
819 | skb->data[1] |= PF_BIT; | |
c0cfe7fa | 820 | irlap_next_state(self, LAP_NRM_P); |
1da177e4 LT |
821 | irlap_send_ui_frame(self, skb_get(skb), self->caddr, CMD_FRAME); |
822 | } | |
823 | } | |
824 | ||
825 | /* How much time we took for transmission of all frames. | |
826 | * We don't know, so let assume we used the full window. Jean II */ | |
827 | transmission_time = self->final_timeout; | |
828 | ||
829 | /* Reset parameter so that we can fill next window */ | |
830 | self->window = self->window_size; | |
831 | ||
832 | #ifdef CONFIG_IRDA_DYNAMIC_WINDOW | |
833 | /* Remove what we have not used. Just do a prorata of the | |
834 | * bytes left in window to window capacity. | |
835 | * See max_line_capacities[][] in qos.c for details. Jean II */ | |
836 | transmission_time -= (self->final_timeout * self->bytes_left | |
837 | / self->line_capacity); | |
838 | IRDA_DEBUG(4, "%s() adjusting transmission_time : ft=%d, bl=%d, lc=%d -> tt=%d\n", __FUNCTION__, self->final_timeout, self->bytes_left, self->line_capacity, transmission_time); | |
839 | ||
840 | /* We are allowed to transmit a maximum number of bytes again. */ | |
841 | self->bytes_left = self->line_capacity; | |
842 | #endif /* CONFIG_IRDA_DYNAMIC_WINDOW */ | |
843 | ||
844 | /* | |
845 | * The network layer has a intermediate buffer between IrLAP | |
846 | * and the IrDA driver which can contain 8 frames. So, even | |
847 | * though IrLAP is currently sending the *last* frame of the | |
848 | * tx-window, the driver most likely has only just started | |
849 | * sending the *first* frame of the same tx-window. | |
850 | * I.e. we are always at the very begining of or Tx window. | |
851 | * Now, we are supposed to set the final timer from the end | |
852 | * of our tx-window to let the other peer reply. So, we need | |
853 | * to add extra time to compensate for the fact that we | |
854 | * are really at the start of tx-window, otherwise the final timer | |
855 | * might expire before he can answer... | |
856 | * Jean II | |
857 | */ | |
858 | irlap_start_final_timer(self, self->final_timeout + transmission_time); | |
859 | ||
860 | /* | |
861 | * The clever amongst you might ask why we do this adjustement | |
862 | * only here, and not in all the other cases in irlap_event.c. | |
863 | * In all those other case, we only send a very short management | |
864 | * frame (few bytes), so the adjustement would be lost in the | |
865 | * noise... | |
866 | * The exception of course is irlap_resend_rejected_frame(). | |
867 | * Jean II */ | |
868 | } | |
869 | ||
870 | /* | |
871 | * Function irlap_send_data_secondary_final (self, skb) | |
872 | * | |
873 | * Send I(nformation) frame as secondary with final bit set | |
874 | * | |
875 | */ | |
876 | void irlap_send_data_secondary_final(struct irlap_cb *self, | |
877 | struct sk_buff *skb) | |
878 | { | |
879 | struct sk_buff *tx_skb = NULL; | |
880 | ||
881 | IRDA_ASSERT(self != NULL, return;); | |
882 | IRDA_ASSERT(self->magic == LAP_MAGIC, return;); | |
883 | IRDA_ASSERT(skb != NULL, return;); | |
884 | ||
885 | /* Is this reliable or unreliable data? */ | |
886 | if (skb->data[1] == I_FRAME) { | |
887 | ||
888 | /* | |
889 | * Insert frame sequence number (Vs) in control field before | |
890 | * inserting into transmit window queue. | |
891 | */ | |
892 | skb->data[1] = I_FRAME | (self->vs << 1); | |
893 | ||
894 | /* | |
895 | * Insert frame in store, in case of retransmissions | |
896 | * Increase skb reference count, see irlap_do_event() | |
897 | */ | |
898 | skb_get(skb); | |
899 | skb_queue_tail(&self->wx_list, skb); | |
900 | ||
901 | tx_skb = skb_clone(skb, GFP_ATOMIC); | |
902 | if (tx_skb == NULL) { | |
903 | return; | |
904 | } | |
905 | ||
906 | tx_skb->data[1] |= PF_BIT; | |
907 | ||
908 | self->vs = (self->vs + 1) % 8; | |
909 | self->ack_required = FALSE; | |
910 | ||
911 | irlap_send_i_frame(self, tx_skb, RSP_FRAME); | |
912 | } else { | |
913 | if (self->ack_required) { | |
914 | irlap_send_ui_frame(self, skb_get(skb), self->caddr, RSP_FRAME); | |
915 | irlap_send_rr_frame(self, RSP_FRAME); | |
916 | self->ack_required = FALSE; | |
917 | } else { | |
918 | skb->data[1] |= PF_BIT; | |
919 | irlap_send_ui_frame(self, skb_get(skb), self->caddr, RSP_FRAME); | |
920 | } | |
921 | } | |
922 | ||
923 | self->window = self->window_size; | |
924 | #ifdef CONFIG_IRDA_DYNAMIC_WINDOW | |
925 | /* We are allowed to transmit a maximum number of bytes again. */ | |
926 | self->bytes_left = self->line_capacity; | |
927 | #endif /* CONFIG_IRDA_DYNAMIC_WINDOW */ | |
928 | ||
929 | irlap_start_wd_timer(self, self->wd_timeout); | |
930 | } | |
931 | ||
932 | /* | |
933 | * Function irlap_send_data_secondary (self, skb) | |
934 | * | |
935 | * Send I(nformation) frame as secondary without final bit set | |
936 | * | |
937 | */ | |
938 | void irlap_send_data_secondary(struct irlap_cb *self, struct sk_buff *skb) | |
939 | { | |
940 | struct sk_buff *tx_skb = NULL; | |
941 | ||
942 | /* Is this reliable or unreliable data? */ | |
943 | if (skb->data[1] == I_FRAME) { | |
944 | ||
945 | /* | |
946 | * Insert frame sequence number (Vs) in control field before | |
947 | * inserting into transmit window queue. | |
948 | */ | |
949 | skb->data[1] = I_FRAME | (self->vs << 1); | |
950 | ||
951 | /* | |
952 | * Insert frame in store, in case of retransmissions | |
953 | * Increase skb reference count, see irlap_do_event() | |
954 | */ | |
955 | skb_get(skb); | |
956 | skb_queue_tail(&self->wx_list, skb); | |
957 | ||
958 | tx_skb = skb_clone(skb, GFP_ATOMIC); | |
959 | if (tx_skb == NULL) { | |
960 | return; | |
961 | } | |
962 | ||
963 | self->vs = (self->vs + 1) % 8; | |
964 | self->ack_required = FALSE; | |
965 | self->window -= 1; | |
966 | ||
967 | irlap_send_i_frame(self, tx_skb, RSP_FRAME); | |
968 | } else { | |
969 | irlap_send_ui_frame(self, skb_get(skb), self->caddr, RSP_FRAME); | |
970 | self->window -= 1; | |
971 | } | |
972 | } | |
973 | ||
974 | /* | |
975 | * Function irlap_resend_rejected_frames (nr) | |
976 | * | |
977 | * Resend frames which has not been acknowledged. Should be safe to | |
978 | * traverse the list without locking it since this function will only be | |
979 | * called from interrupt context (BH) | |
980 | */ | |
981 | void irlap_resend_rejected_frames(struct irlap_cb *self, int command) | |
982 | { | |
983 | struct sk_buff *tx_skb; | |
984 | struct sk_buff *skb; | |
985 | int count; | |
986 | ||
987 | IRDA_ASSERT(self != NULL, return;); | |
988 | IRDA_ASSERT(self->magic == LAP_MAGIC, return;); | |
989 | ||
990 | /* Initialize variables */ | |
991 | count = skb_queue_len(&self->wx_list); | |
992 | ||
993 | /* Resend unacknowledged frame(s) */ | |
994 | skb = skb_peek(&self->wx_list); | |
995 | while (skb != NULL) { | |
996 | irlap_wait_min_turn_around(self, &self->qos_tx); | |
997 | ||
998 | /* We copy the skb to be retransmitted since we will have to | |
999 | * modify it. Cloning will confuse packet sniffers | |
1000 | */ | |
1001 | /* tx_skb = skb_clone( skb, GFP_ATOMIC); */ | |
1002 | tx_skb = skb_copy(skb, GFP_ATOMIC); | |
1003 | if (!tx_skb) { | |
1004 | IRDA_DEBUG(0, "%s(), unable to copy\n", __FUNCTION__); | |
1005 | return; | |
1006 | } | |
1da177e4 LT |
1007 | |
1008 | /* Clear old Nr field + poll bit */ | |
1009 | tx_skb->data[1] &= 0x0f; | |
1010 | ||
1011 | /* | |
1012 | * Set poll bit on the last frame retransmitted | |
1013 | */ | |
1014 | if (count-- == 1) | |
1015 | tx_skb->data[1] |= PF_BIT; /* Set p/f bit */ | |
1016 | else | |
1017 | tx_skb->data[1] &= ~PF_BIT; /* Clear p/f bit */ | |
1018 | ||
1019 | irlap_send_i_frame(self, tx_skb, command); | |
1020 | ||
1021 | /* | |
1022 | * If our skb is the last buffer in the list, then | |
1023 | * we are finished, if not, move to the next sk-buffer | |
1024 | */ | |
1025 | if (skb == skb_peek_tail(&self->wx_list)) | |
1026 | skb = NULL; | |
1027 | else | |
1028 | skb = skb->next; | |
1029 | } | |
1030 | #if 0 /* Not yet */ | |
1031 | /* | |
1032 | * We can now fill the window with additional data frames | |
1033 | */ | |
b03efcfb | 1034 | while (!skb_queue_empty(&self->txq)) { |
1da177e4 LT |
1035 | |
1036 | IRDA_DEBUG(0, "%s(), sending additional frames!\n", __FUNCTION__); | |
b03efcfb | 1037 | if (self->window > 0) { |
1da177e4 LT |
1038 | skb = skb_dequeue( &self->txq); |
1039 | IRDA_ASSERT(skb != NULL, return;); | |
1040 | ||
1041 | /* | |
1042 | * If send window > 1 then send frame with pf | |
1043 | * bit cleared | |
1044 | */ | |
1045 | if ((self->window > 1) && | |
b03efcfb | 1046 | !skb_queue_empty(&self->txq)) { |
1da177e4 LT |
1047 | irlap_send_data_primary(self, skb); |
1048 | } else { | |
1049 | irlap_send_data_primary_poll(self, skb); | |
1050 | } | |
1051 | kfree_skb(skb); | |
1052 | } | |
1053 | } | |
1054 | #endif | |
1055 | } | |
1056 | ||
1057 | void irlap_resend_rejected_frame(struct irlap_cb *self, int command) | |
1058 | { | |
1059 | struct sk_buff *tx_skb; | |
1060 | struct sk_buff *skb; | |
1061 | ||
1062 | IRDA_ASSERT(self != NULL, return;); | |
1063 | IRDA_ASSERT(self->magic == LAP_MAGIC, return;); | |
1064 | ||
1065 | /* Resend unacknowledged frame(s) */ | |
1066 | skb = skb_peek(&self->wx_list); | |
1067 | if (skb != NULL) { | |
1068 | irlap_wait_min_turn_around(self, &self->qos_tx); | |
1069 | ||
1070 | /* We copy the skb to be retransmitted since we will have to | |
1071 | * modify it. Cloning will confuse packet sniffers | |
1072 | */ | |
1073 | /* tx_skb = skb_clone( skb, GFP_ATOMIC); */ | |
1074 | tx_skb = skb_copy(skb, GFP_ATOMIC); | |
1075 | if (!tx_skb) { | |
1076 | IRDA_DEBUG(0, "%s(), unable to copy\n", __FUNCTION__); | |
1077 | return; | |
1078 | } | |
1da177e4 LT |
1079 | |
1080 | /* Clear old Nr field + poll bit */ | |
1081 | tx_skb->data[1] &= 0x0f; | |
1082 | ||
1083 | /* Set poll/final bit */ | |
1084 | tx_skb->data[1] |= PF_BIT; /* Set p/f bit */ | |
1085 | ||
1086 | irlap_send_i_frame(self, tx_skb, command); | |
1087 | } | |
1088 | } | |
1089 | ||
1090 | /* | |
1091 | * Function irlap_send_ui_frame (self, skb, command) | |
1092 | * | |
1093 | * Contruct and transmit an Unnumbered Information (UI) frame | |
1094 | * | |
1095 | */ | |
1096 | void irlap_send_ui_frame(struct irlap_cb *self, struct sk_buff *skb, | |
1097 | __u8 caddr, int command) | |
1098 | { | |
1099 | IRDA_DEBUG(4, "%s()\n", __FUNCTION__); | |
1100 | ||
1101 | IRDA_ASSERT(self != NULL, return;); | |
1102 | IRDA_ASSERT(self->magic == LAP_MAGIC, return;); | |
1103 | IRDA_ASSERT(skb != NULL, return;); | |
1104 | ||
1105 | /* Insert connection address */ | |
1106 | skb->data[0] = caddr | ((command) ? CMD_FRAME : 0); | |
1107 | ||
1108 | irlap_queue_xmit(self, skb); | |
1109 | } | |
1110 | ||
1111 | /* | |
1112 | * Function irlap_send_i_frame (skb) | |
1113 | * | |
1114 | * Contruct and transmit Information (I) frame | |
1115 | */ | |
1116 | static void irlap_send_i_frame(struct irlap_cb *self, struct sk_buff *skb, | |
1117 | int command) | |
1118 | { | |
1119 | /* Insert connection address */ | |
1120 | skb->data[0] = self->caddr; | |
1121 | skb->data[0] |= (command) ? CMD_FRAME : 0; | |
1122 | ||
1123 | /* Insert next to receive (Vr) */ | |
1124 | skb->data[1] |= (self->vr << 5); /* insert nr */ | |
1125 | ||
1126 | irlap_queue_xmit(self, skb); | |
1127 | } | |
1128 | ||
1129 | /* | |
1130 | * Function irlap_recv_i_frame (skb, frame) | |
1131 | * | |
1132 | * Receive and parse an I (Information) frame, no harm in making it inline | |
1133 | * since it's called only from one single place (irlap_driver_rcv). | |
1134 | */ | |
1135 | static inline void irlap_recv_i_frame(struct irlap_cb *self, | |
1136 | struct sk_buff *skb, | |
1137 | struct irlap_info *info, int command) | |
1138 | { | |
1139 | info->nr = skb->data[1] >> 5; /* Next to receive */ | |
1140 | info->pf = skb->data[1] & PF_BIT; /* Final bit */ | |
1141 | info->ns = (skb->data[1] >> 1) & 0x07; /* Next to send */ | |
1142 | ||
1143 | /* Check if this is a command or a response frame */ | |
1144 | if (command) | |
1145 | irlap_do_event(self, RECV_I_CMD, skb, info); | |
1146 | else | |
1147 | irlap_do_event(self, RECV_I_RSP, skb, info); | |
1148 | } | |
1149 | ||
1150 | /* | |
1151 | * Function irlap_recv_ui_frame (self, skb, info) | |
1152 | * | |
1153 | * Receive and parse an Unnumbered Information (UI) frame | |
1154 | * | |
1155 | */ | |
1156 | static void irlap_recv_ui_frame(struct irlap_cb *self, struct sk_buff *skb, | |
1157 | struct irlap_info *info) | |
1158 | { | |
1159 | IRDA_DEBUG( 4, "%s()\n", __FUNCTION__); | |
1160 | ||
1161 | info->pf = skb->data[1] & PF_BIT; /* Final bit */ | |
1162 | ||
1163 | irlap_do_event(self, RECV_UI_FRAME, skb, info); | |
1164 | } | |
1165 | ||
1166 | /* | |
1167 | * Function irlap_recv_frmr_frame (skb, frame) | |
1168 | * | |
1169 | * Received Frame Reject response. | |
1170 | * | |
1171 | */ | |
1172 | static void irlap_recv_frmr_frame(struct irlap_cb *self, struct sk_buff *skb, | |
1173 | struct irlap_info *info) | |
1174 | { | |
1175 | __u8 *frame; | |
1176 | int w, x, y, z; | |
1177 | ||
1178 | IRDA_DEBUG(0, "%s()\n", __FUNCTION__); | |
1179 | ||
1180 | IRDA_ASSERT(self != NULL, return;); | |
1181 | IRDA_ASSERT(self->magic == LAP_MAGIC, return;); | |
1182 | IRDA_ASSERT(skb != NULL, return;); | |
1183 | IRDA_ASSERT(info != NULL, return;); | |
1184 | ||
1185 | if (!pskb_may_pull(skb, 4)) { | |
b450777a | 1186 | IRDA_ERROR("%s: frame too short!\n", __FUNCTION__); |
1da177e4 LT |
1187 | return; |
1188 | } | |
1189 | ||
1190 | frame = skb->data; | |
1191 | ||
1192 | info->nr = frame[2] >> 5; /* Next to receive */ | |
1193 | info->pf = frame[2] & PF_BIT; /* Final bit */ | |
1194 | info->ns = (frame[2] >> 1) & 0x07; /* Next to send */ | |
1195 | ||
1196 | w = frame[3] & 0x01; | |
1197 | x = frame[3] & 0x02; | |
1198 | y = frame[3] & 0x04; | |
1199 | z = frame[3] & 0x08; | |
1200 | ||
1201 | if (w) { | |
1202 | IRDA_DEBUG(0, "Rejected control field is undefined or not " | |
1203 | "implemented.\n"); | |
1204 | } | |
1205 | if (x) { | |
1206 | IRDA_DEBUG(0, "Rejected control field was invalid because it " | |
1207 | "contained a non permitted I field.\n"); | |
1208 | } | |
1209 | if (y) { | |
1210 | IRDA_DEBUG(0, "Received I field exceeded the maximum negotiated " | |
1211 | "for the existing connection or exceeded the maximum " | |
1212 | "this station supports if no connection exists.\n"); | |
1213 | } | |
1214 | if (z) { | |
1215 | IRDA_DEBUG(0, "Rejected control field control field contained an " | |
1216 | "invalid Nr count.\n"); | |
1217 | } | |
1218 | irlap_do_event(self, RECV_FRMR_RSP, skb, info); | |
1219 | } | |
1220 | ||
1221 | /* | |
1222 | * Function irlap_send_test_frame (self, daddr) | |
1223 | * | |
1224 | * Send a test frame response | |
1225 | * | |
1226 | */ | |
1227 | void irlap_send_test_frame(struct irlap_cb *self, __u8 caddr, __u32 daddr, | |
1228 | struct sk_buff *cmd) | |
1229 | { | |
1230 | struct sk_buff *tx_skb; | |
1231 | struct test_frame *frame; | |
1232 | __u8 *info; | |
1233 | ||
1b0fee7d | 1234 | tx_skb = alloc_skb(cmd->len + sizeof(struct test_frame), GFP_ATOMIC); |
1da177e4 LT |
1235 | if (!tx_skb) |
1236 | return; | |
1237 | ||
1238 | /* Broadcast frames must include saddr and daddr fields */ | |
1239 | if (caddr == CBROADCAST) { | |
1240 | frame = (struct test_frame *) | |
1241 | skb_put(tx_skb, sizeof(struct test_frame)); | |
1242 | ||
1243 | /* Insert the swapped addresses */ | |
1244 | frame->saddr = cpu_to_le32(self->saddr); | |
1245 | frame->daddr = cpu_to_le32(daddr); | |
1246 | } else | |
1247 | frame = (struct test_frame *) skb_put(tx_skb, LAP_ADDR_HEADER + LAP_CTRL_HEADER); | |
1248 | ||
1249 | frame->caddr = caddr; | |
1250 | frame->control = TEST_RSP | PF_BIT; | |
1251 | ||
1252 | /* Copy info */ | |
1253 | info = skb_put(tx_skb, cmd->len); | |
1254 | memcpy(info, cmd->data, cmd->len); | |
1255 | ||
1256 | /* Return to sender */ | |
1257 | irlap_wait_min_turn_around(self, &self->qos_tx); | |
1258 | irlap_queue_xmit(self, tx_skb); | |
1259 | } | |
1260 | ||
1261 | /* | |
1262 | * Function irlap_recv_test_frame (self, skb) | |
1263 | * | |
1264 | * Receive a test frame | |
1265 | * | |
1266 | */ | |
1267 | static void irlap_recv_test_frame(struct irlap_cb *self, struct sk_buff *skb, | |
1268 | struct irlap_info *info, int command) | |
1269 | { | |
1270 | struct test_frame *frame; | |
1271 | ||
1272 | IRDA_DEBUG(2, "%s()\n", __FUNCTION__); | |
1273 | ||
1274 | if (!pskb_may_pull(skb, sizeof(*frame))) { | |
b450777a | 1275 | IRDA_ERROR("%s: frame too short!\n", __FUNCTION__); |
1da177e4 LT |
1276 | return; |
1277 | } | |
1278 | frame = (struct test_frame *) skb->data; | |
1279 | ||
1280 | /* Broadcast frames must carry saddr and daddr fields */ | |
1281 | if (info->caddr == CBROADCAST) { | |
1282 | if (skb->len < sizeof(struct test_frame)) { | |
b450777a | 1283 | IRDA_DEBUG(0, "%s() test frame too short!\n", |
1da177e4 LT |
1284 | __FUNCTION__); |
1285 | return; | |
1286 | } | |
1287 | ||
1288 | /* Read and swap addresses */ | |
1289 | info->daddr = le32_to_cpu(frame->saddr); | |
1290 | info->saddr = le32_to_cpu(frame->daddr); | |
1291 | ||
1292 | /* Make sure frame is addressed to us */ | |
1293 | if ((info->saddr != self->saddr) && | |
1294 | (info->saddr != BROADCAST)) { | |
1295 | return; | |
1296 | } | |
1297 | } | |
1298 | ||
1299 | if (command) | |
1300 | irlap_do_event(self, RECV_TEST_CMD, skb, info); | |
1301 | else | |
1302 | irlap_do_event(self, RECV_TEST_RSP, skb, info); | |
1303 | } | |
1304 | ||
1305 | /* | |
1306 | * Function irlap_driver_rcv (skb, netdev, ptype) | |
1307 | * | |
1308 | * Called when a frame is received. Dispatches the right receive function | |
1309 | * for processing of the frame. | |
1310 | * | |
1311 | * Note on skb management : | |
1312 | * After calling the higher layers of the IrDA stack, we always | |
1313 | * kfree() the skb, which drop the reference count (and potentially | |
1314 | * destroy it). | |
1315 | * If a higher layer of the stack want to keep the skb around (to put | |
1316 | * in a queue or pass it to the higher layer), it will need to use | |
1317 | * skb_get() to keep a reference on it. This is usually done at the | |
1318 | * LMP level in irlmp.c. | |
1319 | * Jean II | |
1320 | */ | |
1321 | int irlap_driver_rcv(struct sk_buff *skb, struct net_device *dev, | |
f2ccd8fa | 1322 | struct packet_type *ptype, struct net_device *orig_dev) |
1da177e4 LT |
1323 | { |
1324 | struct irlap_info info; | |
1325 | struct irlap_cb *self; | |
1326 | int command; | |
1327 | __u8 control; | |
1328 | ||
e730c155 EB |
1329 | if (dev->nd_net != &init_net) |
1330 | goto out; | |
1331 | ||
1da177e4 LT |
1332 | /* FIXME: should we get our own field? */ |
1333 | self = (struct irlap_cb *) dev->atalk_ptr; | |
1334 | ||
1335 | /* If the net device is down, then IrLAP is gone! */ | |
1336 | if (!self || self->magic != LAP_MAGIC) { | |
1337 | dev_kfree_skb(skb); | |
1338 | return -1; | |
1339 | } | |
1340 | ||
1341 | /* We are no longer an "old" protocol, so we need to handle | |
1342 | * share and non linear skbs. This should never happen, so | |
1343 | * we don't need to be clever about it. Jean II */ | |
1344 | if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) { | |
1345 | IRDA_ERROR("%s: can't clone shared skb!\n", __FUNCTION__); | |
1346 | dev_kfree_skb(skb); | |
1347 | return -1; | |
1348 | } | |
1349 | ||
1350 | /* Check if frame is large enough for parsing */ | |
1351 | if (!pskb_may_pull(skb, 2)) { | |
b450777a | 1352 | IRDA_ERROR("%s: frame too short!\n", __FUNCTION__); |
1da177e4 LT |
1353 | dev_kfree_skb(skb); |
1354 | return -1; | |
1355 | } | |
1356 | ||
1357 | command = skb->data[0] & CMD_FRAME; | |
1358 | info.caddr = skb->data[0] & CBROADCAST; | |
1359 | ||
1360 | info.pf = skb->data[1] & PF_BIT; | |
1361 | info.control = skb->data[1] & ~PF_BIT; /* Mask away poll/final bit */ | |
1362 | ||
1363 | control = info.control; | |
1364 | ||
1365 | /* First we check if this frame has a valid connection address */ | |
1366 | if ((info.caddr != self->caddr) && (info.caddr != CBROADCAST)) { | |
1367 | IRDA_DEBUG(0, "%s(), wrong connection address!\n", | |
1368 | __FUNCTION__); | |
1369 | goto out; | |
1370 | } | |
1371 | /* | |
1372 | * Optimize for the common case and check if the frame is an | |
1373 | * I(nformation) frame. Only I-frames have bit 0 set to 0 | |
1374 | */ | |
1375 | if (~control & 0x01) { | |
1376 | irlap_recv_i_frame(self, skb, &info, command); | |
1377 | goto out; | |
1378 | } | |
1379 | /* | |
1380 | * We now check is the frame is an S(upervisory) frame. Only | |
1381 | * S-frames have bit 0 set to 1 and bit 1 set to 0 | |
1382 | */ | |
1383 | if (~control & 0x02) { | |
1384 | /* | |
1385 | * Received S(upervisory) frame, check which frame type it is | |
1386 | * only the first nibble is of interest | |
1387 | */ | |
1388 | switch (control & 0x0f) { | |
1389 | case RR: | |
1390 | irlap_recv_rr_frame(self, skb, &info, command); | |
1391 | break; | |
1392 | case RNR: | |
1393 | irlap_recv_rnr_frame(self, skb, &info, command); | |
1394 | break; | |
1395 | case REJ: | |
1396 | irlap_recv_rej_frame(self, skb, &info, command); | |
1397 | break; | |
1398 | case SREJ: | |
1399 | irlap_recv_srej_frame(self, skb, &info, command); | |
1400 | break; | |
1401 | default: | |
1402 | IRDA_WARNING("%s: Unknown S-frame %02x received!\n", | |
1403 | __FUNCTION__, info.control); | |
1404 | break; | |
1405 | } | |
1406 | goto out; | |
1407 | } | |
1408 | /* | |
1409 | * This must be a C(ontrol) frame | |
1410 | */ | |
1411 | switch (control) { | |
1412 | case XID_RSP: | |
1413 | irlap_recv_discovery_xid_rsp(self, skb, &info); | |
1414 | break; | |
1415 | case XID_CMD: | |
1416 | irlap_recv_discovery_xid_cmd(self, skb, &info); | |
1417 | break; | |
1418 | case SNRM_CMD: | |
1419 | irlap_recv_snrm_cmd(self, skb, &info); | |
1420 | break; | |
1421 | case DM_RSP: | |
1422 | irlap_do_event(self, RECV_DM_RSP, skb, &info); | |
1423 | break; | |
1424 | case DISC_CMD: /* And RD_RSP since they have the same value */ | |
1425 | irlap_recv_disc_frame(self, skb, &info, command); | |
1426 | break; | |
1427 | case TEST_CMD: | |
1428 | irlap_recv_test_frame(self, skb, &info, command); | |
1429 | break; | |
1430 | case UA_RSP: | |
1431 | irlap_recv_ua_frame(self, skb, &info); | |
1432 | break; | |
1433 | case FRMR_RSP: | |
1434 | irlap_recv_frmr_frame(self, skb, &info); | |
1435 | break; | |
1436 | case UI_FRAME: | |
1437 | irlap_recv_ui_frame(self, skb, &info); | |
1438 | break; | |
1439 | default: | |
1440 | IRDA_WARNING("%s: Unknown frame %02x received!\n", | |
1441 | __FUNCTION__, info.control); | |
1442 | break; | |
1443 | } | |
1444 | out: | |
1445 | /* Always drop our reference on the skb */ | |
1446 | dev_kfree_skb(skb); | |
1447 | return 0; | |
1448 | } |