Root/
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 | * |
21 | * Neither Dag Brattli nor University of Tromsø admit liability nor |
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; |
96 | skb_reset_mac_header(skb); |
97 | skb_reset_network_header(skb); |
98 | skb_reset_transport_header(skb); |
99 | skb->protocol = htons(ETH_P_IRDA); |
100 | skb->priority = TC_PRIO_BESTEFFORT; |
101 | |
102 | irlap_insert_info(self, skb); |
103 | |
104 | if (unlikely(self->mode & IRDA_MODE_MONITOR)) { |
105 | IRDA_DEBUG(3, "%s(): %s is in monitor mode\n", __func__, |
106 | self->netdev->name); |
107 | dev_kfree_skb(skb); |
108 | return; |
109 | } |
110 | |
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 */ |
129 | tx_skb = alloc_skb(sizeof(struct snrm_frame) + |
130 | IRLAP_NEGOCIATION_PARAMS_LEN, |
131 | GFP_ATOMIC); |
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 | /* |
147 | * If we are establishing a connection then insert QoS parameters |
148 | */ |
149 | if (qos) { |
150 | skb_put(tx_skb, 9); /* 25 left */ |
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 | __func__); |
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 | __func__); |
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", __func__, jiffies); |
219 | |
220 | IRDA_ASSERT(self != NULL, return;); |
221 | IRDA_ASSERT(self->magic == LAP_MAGIC, return;); |
222 | |
223 | /* Allocate frame */ |
224 | tx_skb = alloc_skb(sizeof(struct ua_frame) + |
225 | IRLAP_NEGOCIATION_PARAMS_LEN, |
226 | GFP_ATOMIC); |
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; |
261 | struct dm_frame *frame; |
262 | |
263 | IRDA_ASSERT(self != NULL, return;); |
264 | IRDA_ASSERT(self->magic == LAP_MAGIC, return;); |
265 | |
266 | tx_skb = alloc_skb(sizeof(struct dm_frame), GFP_ATOMIC); |
267 | if (!tx_skb) |
268 | return; |
269 | |
270 | frame = (struct dm_frame *)skb_put(tx_skb, 2); |
271 | |
272 | if (self->state == LAP_NDM) |
273 | frame->caddr = CBROADCAST; |
274 | else |
275 | frame->caddr = self->caddr; |
276 | |
277 | frame->control = DM_RSP | PF_BIT; |
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; |
291 | struct disc_frame *frame; |
292 | |
293 | IRDA_DEBUG(3, "%s()\n", __func__); |
294 | |
295 | IRDA_ASSERT(self != NULL, return;); |
296 | IRDA_ASSERT(self->magic == LAP_MAGIC, return;); |
297 | |
298 | tx_skb = alloc_skb(sizeof(struct disc_frame), GFP_ATOMIC); |
299 | if (!tx_skb) |
300 | return; |
301 | |
302 | frame = (struct disc_frame *)skb_put(tx_skb, 2); |
303 | |
304 | frame->caddr = self->caddr | CMD_FRAME; |
305 | frame->control = DISC_CMD | PF_BIT; |
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", __func__, |
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 | |
331 | tx_skb = alloc_skb(sizeof(struct xid_frame) + IRLAP_DISCOVERY_INFO_LEN, |
332 | GFP_ATOMIC); |
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", __func__); |
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))) { |
423 | IRDA_ERROR("%s: frame too short!\n", __func__); |
424 | return; |
425 | } |
426 | |
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 | __func__); |
436 | return; |
437 | } |
438 | |
439 | if ((discovery = kzalloc(sizeof(discovery_t), GFP_ATOMIC)) == NULL) { |
440 | IRDA_WARNING("%s: kmalloc failed!\n", __func__); |
441 | return; |
442 | } |
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", __func__, |
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))) { |
494 | IRDA_ERROR("%s: frame too short!\n", __func__); |
495 | return; |
496 | } |
497 | |
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 | __func__); |
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... */ |
536 | if((discovery_info == NULL) || |
537 | !pskb_may_pull(skb, 3)) { |
538 | IRDA_ERROR("%s: discovery frame too short!\n", |
539 | __func__); |
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", __func__); |
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; |
590 | struct rr_frame *frame; |
591 | |
592 | tx_skb = alloc_skb(sizeof(struct rr_frame), GFP_ATOMIC); |
593 | if (!tx_skb) |
594 | return; |
595 | |
596 | frame = (struct rr_frame *)skb_put(tx_skb, 2); |
597 | |
598 | frame->caddr = self->caddr; |
599 | frame->caddr |= (command) ? CMD_FRAME : 0; |
600 | |
601 | frame->control = RR | PF_BIT | (self->vr << 5); |
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; |
615 | struct rd_frame *frame; |
616 | |
617 | tx_skb = alloc_skb(sizeof(struct rd_frame), GFP_ATOMIC); |
618 | if (!tx_skb) |
619 | return; |
620 | |
621 | frame = (struct rd_frame *)skb_put(tx_skb, 2); |
622 | |
623 | frame->caddr = self->caddr; |
624 | frame->caddr = RD_RSP | PF_BIT; |
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", __func__, 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", __func__); |
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", __func__); |
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", __func__); |
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", __func__); |
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 | |
808 | irlap_next_state(self, LAP_NRM_P); |
809 | irlap_send_i_frame(self, tx_skb, CMD_FRAME); |
810 | } else { |
811 | IRDA_DEBUG(4, "%s(), sending unreliable frame\n", __func__); |
812 | |
813 | if (self->ack_required) { |
814 | irlap_send_ui_frame(self, skb_get(skb), self->caddr, CMD_FRAME); |
815 | irlap_next_state(self, LAP_NRM_P); |
816 | irlap_send_rr_frame(self, CMD_FRAME); |
817 | self->ack_required = FALSE; |
818 | } else { |
819 | skb->data[1] |= PF_BIT; |
820 | irlap_next_state(self, LAP_NRM_P); |
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", __func__, 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 | |
986 | IRDA_ASSERT(self != NULL, return;); |
987 | IRDA_ASSERT(self->magic == LAP_MAGIC, return;); |
988 | |
989 | /* Resend unacknowledged frame(s) */ |
990 | skb_queue_walk(&self->wx_list, skb) { |
991 | irlap_wait_min_turn_around(self, &self->qos_tx); |
992 | |
993 | /* We copy the skb to be retransmitted since we will have to |
994 | * modify it. Cloning will confuse packet sniffers |
995 | */ |
996 | /* tx_skb = skb_clone( skb, GFP_ATOMIC); */ |
997 | tx_skb = skb_copy(skb, GFP_ATOMIC); |
998 | if (!tx_skb) { |
999 | IRDA_DEBUG(0, "%s(), unable to copy\n", __func__); |
1000 | return; |
1001 | } |
1002 | |
1003 | /* Clear old Nr field + poll bit */ |
1004 | tx_skb->data[1] &= 0x0f; |
1005 | |
1006 | /* |
1007 | * Set poll bit on the last frame retransmitted |
1008 | */ |
1009 | if (skb_queue_is_last(&self->wx_list, skb)) |
1010 | tx_skb->data[1] |= PF_BIT; /* Set p/f bit */ |
1011 | else |
1012 | tx_skb->data[1] &= ~PF_BIT; /* Clear p/f bit */ |
1013 | |
1014 | irlap_send_i_frame(self, tx_skb, command); |
1015 | } |
1016 | #if 0 /* Not yet */ |
1017 | /* |
1018 | * We can now fill the window with additional data frames |
1019 | */ |
1020 | while (!skb_queue_empty(&self->txq)) { |
1021 | |
1022 | IRDA_DEBUG(0, "%s(), sending additional frames!\n", __func__); |
1023 | if (self->window > 0) { |
1024 | skb = skb_dequeue( &self->txq); |
1025 | IRDA_ASSERT(skb != NULL, return;); |
1026 | |
1027 | /* |
1028 | * If send window > 1 then send frame with pf |
1029 | * bit cleared |
1030 | */ |
1031 | if ((self->window > 1) && |
1032 | !skb_queue_empty(&self->txq)) { |
1033 | irlap_send_data_primary(self, skb); |
1034 | } else { |
1035 | irlap_send_data_primary_poll(self, skb); |
1036 | } |
1037 | kfree_skb(skb); |
1038 | } |
1039 | } |
1040 | #endif |
1041 | } |
1042 | |
1043 | void irlap_resend_rejected_frame(struct irlap_cb *self, int command) |
1044 | { |
1045 | struct sk_buff *tx_skb; |
1046 | struct sk_buff *skb; |
1047 | |
1048 | IRDA_ASSERT(self != NULL, return;); |
1049 | IRDA_ASSERT(self->magic == LAP_MAGIC, return;); |
1050 | |
1051 | /* Resend unacknowledged frame(s) */ |
1052 | skb = skb_peek(&self->wx_list); |
1053 | if (skb != NULL) { |
1054 | irlap_wait_min_turn_around(self, &self->qos_tx); |
1055 | |
1056 | /* We copy the skb to be retransmitted since we will have to |
1057 | * modify it. Cloning will confuse packet sniffers |
1058 | */ |
1059 | /* tx_skb = skb_clone( skb, GFP_ATOMIC); */ |
1060 | tx_skb = skb_copy(skb, GFP_ATOMIC); |
1061 | if (!tx_skb) { |
1062 | IRDA_DEBUG(0, "%s(), unable to copy\n", __func__); |
1063 | return; |
1064 | } |
1065 | |
1066 | /* Clear old Nr field + poll bit */ |
1067 | tx_skb->data[1] &= 0x0f; |
1068 | |
1069 | /* Set poll/final bit */ |
1070 | tx_skb->data[1] |= PF_BIT; /* Set p/f bit */ |
1071 | |
1072 | irlap_send_i_frame(self, tx_skb, command); |
1073 | } |
1074 | } |
1075 | |
1076 | /* |
1077 | * Function irlap_send_ui_frame (self, skb, command) |
1078 | * |
1079 | * Contruct and transmit an Unnumbered Information (UI) frame |
1080 | * |
1081 | */ |
1082 | void irlap_send_ui_frame(struct irlap_cb *self, struct sk_buff *skb, |
1083 | __u8 caddr, int command) |
1084 | { |
1085 | IRDA_DEBUG(4, "%s()\n", __func__); |
1086 | |
1087 | IRDA_ASSERT(self != NULL, return;); |
1088 | IRDA_ASSERT(self->magic == LAP_MAGIC, return;); |
1089 | IRDA_ASSERT(skb != NULL, return;); |
1090 | |
1091 | /* Insert connection address */ |
1092 | skb->data[0] = caddr | ((command) ? CMD_FRAME : 0); |
1093 | |
1094 | irlap_queue_xmit(self, skb); |
1095 | } |
1096 | |
1097 | /* |
1098 | * Function irlap_send_i_frame (skb) |
1099 | * |
1100 | * Contruct and transmit Information (I) frame |
1101 | */ |
1102 | static void irlap_send_i_frame(struct irlap_cb *self, struct sk_buff *skb, |
1103 | int command) |
1104 | { |
1105 | /* Insert connection address */ |
1106 | skb->data[0] = self->caddr; |
1107 | skb->data[0] |= (command) ? CMD_FRAME : 0; |
1108 | |
1109 | /* Insert next to receive (Vr) */ |
1110 | skb->data[1] |= (self->vr << 5); /* insert nr */ |
1111 | |
1112 | irlap_queue_xmit(self, skb); |
1113 | } |
1114 | |
1115 | /* |
1116 | * Function irlap_recv_i_frame (skb, frame) |
1117 | * |
1118 | * Receive and parse an I (Information) frame, no harm in making it inline |
1119 | * since it's called only from one single place (irlap_driver_rcv). |
1120 | */ |
1121 | static inline void irlap_recv_i_frame(struct irlap_cb *self, |
1122 | struct sk_buff *skb, |
1123 | struct irlap_info *info, int command) |
1124 | { |
1125 | info->nr = skb->data[1] >> 5; /* Next to receive */ |
1126 | info->pf = skb->data[1] & PF_BIT; /* Final bit */ |
1127 | info->ns = (skb->data[1] >> 1) & 0x07; /* Next to send */ |
1128 | |
1129 | /* Check if this is a command or a response frame */ |
1130 | if (command) |
1131 | irlap_do_event(self, RECV_I_CMD, skb, info); |
1132 | else |
1133 | irlap_do_event(self, RECV_I_RSP, skb, info); |
1134 | } |
1135 | |
1136 | /* |
1137 | * Function irlap_recv_ui_frame (self, skb, info) |
1138 | * |
1139 | * Receive and parse an Unnumbered Information (UI) frame |
1140 | * |
1141 | */ |
1142 | static void irlap_recv_ui_frame(struct irlap_cb *self, struct sk_buff *skb, |
1143 | struct irlap_info *info) |
1144 | { |
1145 | IRDA_DEBUG( 4, "%s()\n", __func__); |
1146 | |
1147 | info->pf = skb->data[1] & PF_BIT; /* Final bit */ |
1148 | |
1149 | irlap_do_event(self, RECV_UI_FRAME, skb, info); |
1150 | } |
1151 | |
1152 | /* |
1153 | * Function irlap_recv_frmr_frame (skb, frame) |
1154 | * |
1155 | * Received Frame Reject response. |
1156 | * |
1157 | */ |
1158 | static void irlap_recv_frmr_frame(struct irlap_cb *self, struct sk_buff *skb, |
1159 | struct irlap_info *info) |
1160 | { |
1161 | __u8 *frame; |
1162 | int w, x, y, z; |
1163 | |
1164 | IRDA_DEBUG(0, "%s()\n", __func__); |
1165 | |
1166 | IRDA_ASSERT(self != NULL, return;); |
1167 | IRDA_ASSERT(self->magic == LAP_MAGIC, return;); |
1168 | IRDA_ASSERT(skb != NULL, return;); |
1169 | IRDA_ASSERT(info != NULL, return;); |
1170 | |
1171 | if (!pskb_may_pull(skb, 4)) { |
1172 | IRDA_ERROR("%s: frame too short!\n", __func__); |
1173 | return; |
1174 | } |
1175 | |
1176 | frame = skb->data; |
1177 | |
1178 | info->nr = frame[2] >> 5; /* Next to receive */ |
1179 | info->pf = frame[2] & PF_BIT; /* Final bit */ |
1180 | info->ns = (frame[2] >> 1) & 0x07; /* Next to send */ |
1181 | |
1182 | w = frame[3] & 0x01; |
1183 | x = frame[3] & 0x02; |
1184 | y = frame[3] & 0x04; |
1185 | z = frame[3] & 0x08; |
1186 | |
1187 | if (w) { |
1188 | IRDA_DEBUG(0, "Rejected control field is undefined or not " |
1189 | "implemented.\n"); |
1190 | } |
1191 | if (x) { |
1192 | IRDA_DEBUG(0, "Rejected control field was invalid because it " |
1193 | "contained a non permitted I field.\n"); |
1194 | } |
1195 | if (y) { |
1196 | IRDA_DEBUG(0, "Received I field exceeded the maximum negotiated " |
1197 | "for the existing connection or exceeded the maximum " |
1198 | "this station supports if no connection exists.\n"); |
1199 | } |
1200 | if (z) { |
1201 | IRDA_DEBUG(0, "Rejected control field control field contained an " |
1202 | "invalid Nr count.\n"); |
1203 | } |
1204 | irlap_do_event(self, RECV_FRMR_RSP, skb, info); |
1205 | } |
1206 | |
1207 | /* |
1208 | * Function irlap_send_test_frame (self, daddr) |
1209 | * |
1210 | * Send a test frame response |
1211 | * |
1212 | */ |
1213 | void irlap_send_test_frame(struct irlap_cb *self, __u8 caddr, __u32 daddr, |
1214 | struct sk_buff *cmd) |
1215 | { |
1216 | struct sk_buff *tx_skb; |
1217 | struct test_frame *frame; |
1218 | __u8 *info; |
1219 | |
1220 | tx_skb = alloc_skb(cmd->len + sizeof(struct test_frame), GFP_ATOMIC); |
1221 | if (!tx_skb) |
1222 | return; |
1223 | |
1224 | /* Broadcast frames must include saddr and daddr fields */ |
1225 | if (caddr == CBROADCAST) { |
1226 | frame = (struct test_frame *) |
1227 | skb_put(tx_skb, sizeof(struct test_frame)); |
1228 | |
1229 | /* Insert the swapped addresses */ |
1230 | frame->saddr = cpu_to_le32(self->saddr); |
1231 | frame->daddr = cpu_to_le32(daddr); |
1232 | } else |
1233 | frame = (struct test_frame *) skb_put(tx_skb, LAP_ADDR_HEADER + LAP_CTRL_HEADER); |
1234 | |
1235 | frame->caddr = caddr; |
1236 | frame->control = TEST_RSP | PF_BIT; |
1237 | |
1238 | /* Copy info */ |
1239 | info = skb_put(tx_skb, cmd->len); |
1240 | memcpy(info, cmd->data, cmd->len); |
1241 | |
1242 | /* Return to sender */ |
1243 | irlap_wait_min_turn_around(self, &self->qos_tx); |
1244 | irlap_queue_xmit(self, tx_skb); |
1245 | } |
1246 | |
1247 | /* |
1248 | * Function irlap_recv_test_frame (self, skb) |
1249 | * |
1250 | * Receive a test frame |
1251 | * |
1252 | */ |
1253 | static void irlap_recv_test_frame(struct irlap_cb *self, struct sk_buff *skb, |
1254 | struct irlap_info *info, int command) |
1255 | { |
1256 | struct test_frame *frame; |
1257 | |
1258 | IRDA_DEBUG(2, "%s()\n", __func__); |
1259 | |
1260 | if (!pskb_may_pull(skb, sizeof(*frame))) { |
1261 | IRDA_ERROR("%s: frame too short!\n", __func__); |
1262 | return; |
1263 | } |
1264 | frame = (struct test_frame *) skb->data; |
1265 | |
1266 | /* Broadcast frames must carry saddr and daddr fields */ |
1267 | if (info->caddr == CBROADCAST) { |
1268 | if (skb->len < sizeof(struct test_frame)) { |
1269 | IRDA_DEBUG(0, "%s() test frame too short!\n", |
1270 | __func__); |
1271 | return; |
1272 | } |
1273 | |
1274 | /* Read and swap addresses */ |
1275 | info->daddr = le32_to_cpu(frame->saddr); |
1276 | info->saddr = le32_to_cpu(frame->daddr); |
1277 | |
1278 | /* Make sure frame is addressed to us */ |
1279 | if ((info->saddr != self->saddr) && |
1280 | (info->saddr != BROADCAST)) { |
1281 | return; |
1282 | } |
1283 | } |
1284 | |
1285 | if (command) |
1286 | irlap_do_event(self, RECV_TEST_CMD, skb, info); |
1287 | else |
1288 | irlap_do_event(self, RECV_TEST_RSP, skb, info); |
1289 | } |
1290 | |
1291 | /* |
1292 | * Function irlap_driver_rcv (skb, netdev, ptype) |
1293 | * |
1294 | * Called when a frame is received. Dispatches the right receive function |
1295 | * for processing of the frame. |
1296 | * |
1297 | * Note on skb management : |
1298 | * After calling the higher layers of the IrDA stack, we always |
1299 | * kfree() the skb, which drop the reference count (and potentially |
1300 | * destroy it). |
1301 | * If a higher layer of the stack want to keep the skb around (to put |
1302 | * in a queue or pass it to the higher layer), it will need to use |
1303 | * skb_get() to keep a reference on it. This is usually done at the |
1304 | * LMP level in irlmp.c. |
1305 | * Jean II |
1306 | */ |
1307 | int irlap_driver_rcv(struct sk_buff *skb, struct net_device *dev, |
1308 | struct packet_type *ptype, struct net_device *orig_dev) |
1309 | { |
1310 | struct irlap_info info; |
1311 | struct irlap_cb *self; |
1312 | int command; |
1313 | __u8 control; |
1314 | int ret = -1; |
1315 | |
1316 | if (!net_eq(dev_net(dev), &init_net)) |
1317 | goto out; |
1318 | |
1319 | /* FIXME: should we get our own field? */ |
1320 | self = (struct irlap_cb *) dev->atalk_ptr; |
1321 | |
1322 | /* If the net device is down, then IrLAP is gone! */ |
1323 | if (!self || self->magic != LAP_MAGIC) |
1324 | goto err; |
1325 | |
1326 | /* We are no longer an "old" protocol, so we need to handle |
1327 | * share and non linear skbs. This should never happen, so |
1328 | * we don't need to be clever about it. Jean II */ |
1329 | if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) { |
1330 | IRDA_ERROR("%s: can't clone shared skb!\n", __func__); |
1331 | goto err; |
1332 | } |
1333 | |
1334 | /* Check if frame is large enough for parsing */ |
1335 | if (!pskb_may_pull(skb, 2)) { |
1336 | IRDA_ERROR("%s: frame too short!\n", __func__); |
1337 | goto err; |
1338 | } |
1339 | |
1340 | command = skb->data[0] & CMD_FRAME; |
1341 | info.caddr = skb->data[0] & CBROADCAST; |
1342 | |
1343 | info.pf = skb->data[1] & PF_BIT; |
1344 | info.control = skb->data[1] & ~PF_BIT; /* Mask away poll/final bit */ |
1345 | |
1346 | control = info.control; |
1347 | |
1348 | /* First we check if this frame has a valid connection address */ |
1349 | if ((info.caddr != self->caddr) && (info.caddr != CBROADCAST)) { |
1350 | IRDA_DEBUG(0, "%s(), wrong connection address!\n", |
1351 | __func__); |
1352 | goto out; |
1353 | } |
1354 | /* |
1355 | * Optimize for the common case and check if the frame is an |
1356 | * I(nformation) frame. Only I-frames have bit 0 set to 0 |
1357 | */ |
1358 | if (~control & 0x01) { |
1359 | irlap_recv_i_frame(self, skb, &info, command); |
1360 | goto out; |
1361 | } |
1362 | /* |
1363 | * We now check is the frame is an S(upervisory) frame. Only |
1364 | * S-frames have bit 0 set to 1 and bit 1 set to 0 |
1365 | */ |
1366 | if (~control & 0x02) { |
1367 | /* |
1368 | * Received S(upervisory) frame, check which frame type it is |
1369 | * only the first nibble is of interest |
1370 | */ |
1371 | switch (control & 0x0f) { |
1372 | case RR: |
1373 | irlap_recv_rr_frame(self, skb, &info, command); |
1374 | break; |
1375 | case RNR: |
1376 | irlap_recv_rnr_frame(self, skb, &info, command); |
1377 | break; |
1378 | case REJ: |
1379 | irlap_recv_rej_frame(self, skb, &info, command); |
1380 | break; |
1381 | case SREJ: |
1382 | irlap_recv_srej_frame(self, skb, &info, command); |
1383 | break; |
1384 | default: |
1385 | IRDA_WARNING("%s: Unknown S-frame %02x received!\n", |
1386 | __func__, info.control); |
1387 | break; |
1388 | } |
1389 | goto out; |
1390 | } |
1391 | /* |
1392 | * This must be a C(ontrol) frame |
1393 | */ |
1394 | switch (control) { |
1395 | case XID_RSP: |
1396 | irlap_recv_discovery_xid_rsp(self, skb, &info); |
1397 | break; |
1398 | case XID_CMD: |
1399 | irlap_recv_discovery_xid_cmd(self, skb, &info); |
1400 | break; |
1401 | case SNRM_CMD: |
1402 | irlap_recv_snrm_cmd(self, skb, &info); |
1403 | break; |
1404 | case DM_RSP: |
1405 | irlap_do_event(self, RECV_DM_RSP, skb, &info); |
1406 | break; |
1407 | case DISC_CMD: /* And RD_RSP since they have the same value */ |
1408 | irlap_recv_disc_frame(self, skb, &info, command); |
1409 | break; |
1410 | case TEST_CMD: |
1411 | irlap_recv_test_frame(self, skb, &info, command); |
1412 | break; |
1413 | case UA_RSP: |
1414 | irlap_recv_ua_frame(self, skb, &info); |
1415 | break; |
1416 | case FRMR_RSP: |
1417 | irlap_recv_frmr_frame(self, skb, &info); |
1418 | break; |
1419 | case UI_FRAME: |
1420 | irlap_recv_ui_frame(self, skb, &info); |
1421 | break; |
1422 | default: |
1423 | IRDA_WARNING("%s: Unknown frame %02x received!\n", |
1424 | __func__, info.control); |
1425 | break; |
1426 | } |
1427 | out: |
1428 | ret = 0; |
1429 | err: |
1430 | /* Always drop our reference on the skb */ |
1431 | dev_kfree_skb(skb); |
1432 | return ret; |
1433 | } |
1434 |
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