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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /net/irda/irlap_frame.c
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'net/irda/irlap_frame.c')
-rw-r--r--net/irda/irlap_frame.c1437
1 files changed, 1437 insertions, 0 deletions
diff --git a/net/irda/irlap_frame.c b/net/irda/irlap_frame.c
new file mode 100644
index 000000000000..040abe714aa3
--- /dev/null
+++ b/net/irda/irlap_frame.c
@@ -0,0 +1,1437 @@
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 Tromsų 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
46static 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 */
56static 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 */
92void irlap_queue_xmit(struct irlap_cb *self, struct sk_buff *skb)
93{
94 /* Some common init stuff */
95 skb->dev = self->netdev;
96 skb->h.raw = skb->nh.raw = skb->mac.raw = skb->data;
97 skb->protocol = htons(ETH_P_IRDA);
98 skb->priority = TC_PRIO_BESTEFFORT;
99
100 irlap_insert_info(self, skb);
101
102 dev_queue_xmit(skb);
103}
104
105/*
106 * Function irlap_send_snrm_cmd (void)
107 *
108 * Transmits a connect SNRM command frame
109 */
110void irlap_send_snrm_frame(struct irlap_cb *self, struct qos_info *qos)
111{
112 struct sk_buff *tx_skb;
113 struct snrm_frame *frame;
114 int ret;
115
116 IRDA_ASSERT(self != NULL, return;);
117 IRDA_ASSERT(self->magic == LAP_MAGIC, return;);
118
119 /* Allocate frame */
120 tx_skb = dev_alloc_skb(64);
121 if (!tx_skb)
122 return;
123
124 frame = (struct snrm_frame *) skb_put(tx_skb, 2);
125
126 /* Insert connection address field */
127 if (qos)
128 frame->caddr = CMD_FRAME | CBROADCAST;
129 else
130 frame->caddr = CMD_FRAME | self->caddr;
131
132 /* Insert control field */
133 frame->control = SNRM_CMD | PF_BIT;
134
135 /*
136 * If we are establishing a connection then insert QoS paramerters
137 */
138 if (qos) {
139 skb_put(tx_skb, 9); /* 21 left */
140 frame->saddr = cpu_to_le32(self->saddr);
141 frame->daddr = cpu_to_le32(self->daddr);
142
143 frame->ncaddr = self->caddr;
144
145 ret = irlap_insert_qos_negotiation_params(self, tx_skb);
146 if (ret < 0) {
147 dev_kfree_skb(tx_skb);
148 return;
149 }
150 }
151 irlap_queue_xmit(self, tx_skb);
152}
153
154/*
155 * Function irlap_recv_snrm_cmd (skb, info)
156 *
157 * Received SNRM (Set Normal Response Mode) command frame
158 *
159 */
160static void irlap_recv_snrm_cmd(struct irlap_cb *self, struct sk_buff *skb,
161 struct irlap_info *info)
162{
163 struct snrm_frame *frame;
164
165 if (pskb_may_pull(skb,sizeof(struct snrm_frame))) {
166 frame = (struct snrm_frame *) skb->data;
167
168 /* Copy the new connection address ignoring the C/R bit */
169 info->caddr = frame->ncaddr & 0xFE;
170
171 /* Check if the new connection address is valid */
172 if ((info->caddr == 0x00) || (info->caddr == 0xfe)) {
173 IRDA_DEBUG(3, "%s(), invalid connection address!\n",
174 __FUNCTION__);
175 return;
176 }
177
178 /* Copy peer device address */
179 info->daddr = le32_to_cpu(frame->saddr);
180 info->saddr = le32_to_cpu(frame->daddr);
181
182 /* Only accept if addressed directly to us */
183 if (info->saddr != self->saddr) {
184 IRDA_DEBUG(2, "%s(), not addressed to us!\n",
185 __FUNCTION__);
186 return;
187 }
188 irlap_do_event(self, RECV_SNRM_CMD, skb, info);
189 } else {
190 /* Signal that this SNRM frame does not contain and I-field */
191 irlap_do_event(self, RECV_SNRM_CMD, skb, NULL);
192 }
193}
194
195/*
196 * Function irlap_send_ua_response_frame (qos)
197 *
198 * Send UA (Unnumbered Acknowledgement) frame
199 *
200 */
201void irlap_send_ua_response_frame(struct irlap_cb *self, struct qos_info *qos)
202{
203 struct sk_buff *tx_skb;
204 struct ua_frame *frame;
205 int ret;
206
207 IRDA_DEBUG(2, "%s() <%ld>\n", __FUNCTION__, jiffies);
208
209 IRDA_ASSERT(self != NULL, return;);
210 IRDA_ASSERT(self->magic == LAP_MAGIC, return;);
211
212 /* Allocate frame */
213 tx_skb = dev_alloc_skb(64);
214 if (!tx_skb)
215 return;
216
217 frame = (struct ua_frame *) skb_put(tx_skb, 10);
218
219 /* Build UA response */
220 frame->caddr = self->caddr;
221 frame->control = UA_RSP | PF_BIT;
222
223 frame->saddr = cpu_to_le32(self->saddr);
224 frame->daddr = cpu_to_le32(self->daddr);
225
226 /* Should we send QoS negotiation parameters? */
227 if (qos) {
228 ret = irlap_insert_qos_negotiation_params(self, tx_skb);
229 if (ret < 0) {
230 dev_kfree_skb(tx_skb);
231 return;
232 }
233 }
234
235 irlap_queue_xmit(self, tx_skb);
236}
237
238
239/*
240 * Function irlap_send_dm_frame (void)
241 *
242 * Send disconnected mode (DM) frame
243 *
244 */
245void irlap_send_dm_frame( struct irlap_cb *self)
246{
247 struct sk_buff *tx_skb = NULL;
248 __u8 *frame;
249
250 IRDA_ASSERT(self != NULL, return;);
251 IRDA_ASSERT(self->magic == LAP_MAGIC, return;);
252
253 tx_skb = dev_alloc_skb(32);
254 if (!tx_skb)
255 return;
256
257 frame = skb_put(tx_skb, 2);
258
259 if (self->state == LAP_NDM)
260 frame[0] = CBROADCAST;
261 else
262 frame[0] = self->caddr;
263
264 frame[1] = DM_RSP | PF_BIT;
265
266 irlap_queue_xmit(self, tx_skb);
267}
268
269/*
270 * Function irlap_send_disc_frame (void)
271 *
272 * Send disconnect (DISC) frame
273 *
274 */
275void irlap_send_disc_frame(struct irlap_cb *self)
276{
277 struct sk_buff *tx_skb = NULL;
278 __u8 *frame;
279
280 IRDA_DEBUG(3, "%s()\n", __FUNCTION__);
281
282 IRDA_ASSERT(self != NULL, return;);
283 IRDA_ASSERT(self->magic == LAP_MAGIC, return;);
284
285 tx_skb = dev_alloc_skb(16);
286 if (!tx_skb)
287 return;
288
289 frame = skb_put(tx_skb, 2);
290
291 frame[0] = self->caddr | CMD_FRAME;
292 frame[1] = DISC_CMD | PF_BIT;
293
294 irlap_queue_xmit(self, tx_skb);
295}
296
297/*
298 * Function irlap_send_discovery_xid_frame (S, s, command)
299 *
300 * Build and transmit a XID (eXchange station IDentifier) discovery
301 * frame.
302 */
303void irlap_send_discovery_xid_frame(struct irlap_cb *self, int S, __u8 s,
304 __u8 command, discovery_t *discovery)
305{
306 struct sk_buff *tx_skb = NULL;
307 struct xid_frame *frame;
308 __u32 bcast = BROADCAST;
309 __u8 *info;
310
311 IRDA_DEBUG(4, "%s(), s=%d, S=%d, command=%d\n", __FUNCTION__,
312 s, S, command);
313
314 IRDA_ASSERT(self != NULL, return;);
315 IRDA_ASSERT(self->magic == LAP_MAGIC, return;);
316 IRDA_ASSERT(discovery != NULL, return;);
317
318 tx_skb = dev_alloc_skb(64);
319 if (!tx_skb)
320 return;
321
322 skb_put(tx_skb, 14);
323 frame = (struct xid_frame *) tx_skb->data;
324
325 if (command) {
326 frame->caddr = CBROADCAST | CMD_FRAME;
327 frame->control = XID_CMD | PF_BIT;
328 } else {
329 frame->caddr = CBROADCAST;
330 frame->control = XID_RSP | PF_BIT;
331 }
332 frame->ident = XID_FORMAT;
333
334 frame->saddr = cpu_to_le32(self->saddr);
335
336 if (command)
337 frame->daddr = cpu_to_le32(bcast);
338 else
339 frame->daddr = cpu_to_le32(discovery->data.daddr);
340
341 switch (S) {
342 case 1:
343 frame->flags = 0x00;
344 break;
345 case 6:
346 frame->flags = 0x01;
347 break;
348 case 8:
349 frame->flags = 0x02;
350 break;
351 case 16:
352 frame->flags = 0x03;
353 break;
354 default:
355 frame->flags = 0x02;
356 break;
357 }
358
359 frame->slotnr = s;
360 frame->version = 0x00;
361
362 /*
363 * Provide info for final slot only in commands, and for all
364 * responses. Send the second byte of the hint only if the
365 * EXTENSION bit is set in the first byte.
366 */
367 if (!command || (frame->slotnr == 0xff)) {
368 int len;
369
370 if (discovery->data.hints[0] & HINT_EXTENSION) {
371 info = skb_put(tx_skb, 2);
372 info[0] = discovery->data.hints[0];
373 info[1] = discovery->data.hints[1];
374 } else {
375 info = skb_put(tx_skb, 1);
376 info[0] = discovery->data.hints[0];
377 }
378 info = skb_put(tx_skb, 1);
379 info[0] = discovery->data.charset;
380
381 len = IRDA_MIN(discovery->name_len, skb_tailroom(tx_skb));
382 info = skb_put(tx_skb, len);
383 memcpy(info, discovery->data.info, len);
384 }
385 irlap_queue_xmit(self, tx_skb);
386}
387
388/*
389 * Function irlap_recv_discovery_xid_rsp (skb, info)
390 *
391 * Received a XID discovery response
392 *
393 */
394static void irlap_recv_discovery_xid_rsp(struct irlap_cb *self,
395 struct sk_buff *skb,
396 struct irlap_info *info)
397{
398 struct xid_frame *xid;
399 discovery_t *discovery = NULL;
400 __u8 *discovery_info;
401 char *text;
402
403 IRDA_DEBUG(4, "%s()\n", __FUNCTION__);
404
405 IRDA_ASSERT(self != NULL, return;);
406 IRDA_ASSERT(self->magic == LAP_MAGIC, return;);
407
408 if (!pskb_may_pull(skb, sizeof(struct xid_frame))) {
409 IRDA_ERROR("%s: frame to short!\n", __FUNCTION__);
410 return;
411 }
412
413 xid = (struct xid_frame *) skb->data;
414
415 info->daddr = le32_to_cpu(xid->saddr);
416 info->saddr = le32_to_cpu(xid->daddr);
417
418 /* Make sure frame is addressed to us */
419 if ((info->saddr != self->saddr) && (info->saddr != BROADCAST)) {
420 IRDA_DEBUG(0, "%s(), frame is not addressed to us!\n",
421 __FUNCTION__);
422 return;
423 }
424
425 if ((discovery = kmalloc(sizeof(discovery_t), GFP_ATOMIC)) == NULL) {
426 IRDA_WARNING("%s: kmalloc failed!\n", __FUNCTION__);
427 return;
428 }
429 memset(discovery, 0, sizeof(discovery_t));
430
431 discovery->data.daddr = info->daddr;
432 discovery->data.saddr = self->saddr;
433 discovery->timestamp = jiffies;
434
435 IRDA_DEBUG(4, "%s(), daddr=%08x\n", __FUNCTION__,
436 discovery->data.daddr);
437
438 discovery_info = skb_pull(skb, sizeof(struct xid_frame));
439
440 /* Get info returned from peer */
441 discovery->data.hints[0] = discovery_info[0];
442 if (discovery_info[0] & HINT_EXTENSION) {
443 IRDA_DEBUG(4, "EXTENSION\n");
444 discovery->data.hints[1] = discovery_info[1];
445 discovery->data.charset = discovery_info[2];
446 text = (char *) &discovery_info[3];
447 } else {
448 discovery->data.hints[1] = 0;
449 discovery->data.charset = discovery_info[1];
450 text = (char *) &discovery_info[2];
451 }
452 /*
453 * Terminate info string, should be safe since this is where the
454 * FCS bytes resides.
455 */
456 skb->data[skb->len] = '\0';
457 strncpy(discovery->data.info, text, NICKNAME_MAX_LEN);
458 discovery->name_len = strlen(discovery->data.info);
459
460 info->discovery = discovery;
461
462 irlap_do_event(self, RECV_DISCOVERY_XID_RSP, skb, info);
463}
464
465/*
466 * Function irlap_recv_discovery_xid_cmd (skb, info)
467 *
468 * Received a XID discovery command
469 *
470 */
471static void irlap_recv_discovery_xid_cmd(struct irlap_cb *self,
472 struct sk_buff *skb,
473 struct irlap_info *info)
474{
475 struct xid_frame *xid;
476 discovery_t *discovery = NULL;
477 __u8 *discovery_info;
478 char *text;
479
480 if (!pskb_may_pull(skb, sizeof(struct xid_frame))) {
481 IRDA_ERROR("%s: frame to short!\n", __FUNCTION__);
482 return;
483 }
484
485 xid = (struct xid_frame *) skb->data;
486
487 info->daddr = le32_to_cpu(xid->saddr);
488 info->saddr = le32_to_cpu(xid->daddr);
489
490 /* Make sure frame is addressed to us */
491 if ((info->saddr != self->saddr) && (info->saddr != BROADCAST)) {
492 IRDA_DEBUG(0, "%s(), frame is not addressed to us!\n",
493 __FUNCTION__);
494 return;
495 }
496
497 switch (xid->flags & 0x03) {
498 case 0x00:
499 info->S = 1;
500 break;
501 case 0x01:
502 info->S = 6;
503 break;
504 case 0x02:
505 info->S = 8;
506 break;
507 case 0x03:
508 info->S = 16;
509 break;
510 default:
511 /* Error!! */
512 return;
513 }
514 info->s = xid->slotnr;
515
516 discovery_info = skb_pull(skb, sizeof(struct xid_frame));
517
518 /*
519 * Check if last frame
520 */
521 if (info->s == 0xff) {
522 /* Check if things are sane at this point... */
523 if((discovery_info == NULL) ||
524 !pskb_may_pull(skb, 3)) {
525 IRDA_ERROR("%s: discovery frame to short!\n",
526 __FUNCTION__);
527 return;
528 }
529
530 /*
531 * We now have some discovery info to deliver!
532 */
533 discovery = kmalloc(sizeof(discovery_t), GFP_ATOMIC);
534 if (!discovery) {
535 IRDA_WARNING("%s: unable to malloc!\n", __FUNCTION__);
536 return;
537 }
538
539 discovery->data.daddr = info->daddr;
540 discovery->data.saddr = self->saddr;
541 discovery->timestamp = jiffies;
542
543 discovery->data.hints[0] = discovery_info[0];
544 if (discovery_info[0] & HINT_EXTENSION) {
545 discovery->data.hints[1] = discovery_info[1];
546 discovery->data.charset = discovery_info[2];
547 text = (char *) &discovery_info[3];
548 } else {
549 discovery->data.hints[1] = 0;
550 discovery->data.charset = discovery_info[1];
551 text = (char *) &discovery_info[2];
552 }
553 /*
554 * Terminate string, should be safe since this is where the
555 * FCS bytes resides.
556 */
557 skb->data[skb->len] = '\0';
558 strncpy(discovery->data.info, text, NICKNAME_MAX_LEN);
559 discovery->name_len = strlen(discovery->data.info);
560
561 info->discovery = discovery;
562 } else
563 info->discovery = NULL;
564
565 irlap_do_event(self, RECV_DISCOVERY_XID_CMD, skb, info);
566}
567
568/*
569 * Function irlap_send_rr_frame (self, command)
570 *
571 * Build and transmit RR (Receive Ready) frame. Notice that it is currently
572 * only possible to send RR frames with the poll bit set.
573 */
574void irlap_send_rr_frame(struct irlap_cb *self, int command)
575{
576 struct sk_buff *tx_skb;
577 __u8 *frame;
578
579 tx_skb = dev_alloc_skb(16);
580 if (!tx_skb)
581 return;
582
583 frame = skb_put(tx_skb, 2);
584
585 frame[0] = self->caddr;
586 frame[0] |= (command) ? CMD_FRAME : 0;
587
588 frame[1] = RR | PF_BIT | (self->vr << 5);
589
590 irlap_queue_xmit(self, tx_skb);
591}
592
593/*
594 * Function irlap_send_rd_frame (self)
595 *
596 * Request disconnect. Used by a secondary station to request the
597 * disconnection of the link.
598 */
599void irlap_send_rd_frame(struct irlap_cb *self)
600{
601 struct sk_buff *tx_skb;
602 __u8 *frame;
603
604 tx_skb = dev_alloc_skb(16);
605 if (!tx_skb)
606 return;
607
608 frame = skb_put(tx_skb, 2);
609
610 frame[0] = self->caddr;
611 frame[1] = RD_RSP | PF_BIT;
612
613 irlap_queue_xmit(self, tx_skb);
614}
615
616/*
617 * Function irlap_recv_rr_frame (skb, info)
618 *
619 * Received RR (Receive Ready) frame from peer station, no harm in
620 * making it inline since its called only from one single place
621 * (irlap_driver_rcv).
622 */
623static inline void irlap_recv_rr_frame(struct irlap_cb *self,
624 struct sk_buff *skb,
625 struct irlap_info *info, int command)
626{
627 info->nr = skb->data[1] >> 5;
628
629 /* Check if this is a command or a response frame */
630 if (command)
631 irlap_do_event(self, RECV_RR_CMD, skb, info);
632 else
633 irlap_do_event(self, RECV_RR_RSP, skb, info);
634}
635
636/*
637 * Function irlap_recv_rnr_frame (self, skb, info)
638 *
639 * Received RNR (Receive Not Ready) frame from peer station
640 *
641 */
642static void irlap_recv_rnr_frame(struct irlap_cb *self, struct sk_buff *skb,
643 struct irlap_info *info, int command)
644{
645 info->nr = skb->data[1] >> 5;
646
647 IRDA_DEBUG(4, "%s(), nr=%d, %ld\n", __FUNCTION__, info->nr, jiffies);
648
649 if (command)
650 irlap_do_event(self, RECV_RNR_CMD, skb, info);
651 else
652 irlap_do_event(self, RECV_RNR_RSP, skb, info);
653}
654
655static void irlap_recv_rej_frame(struct irlap_cb *self, struct sk_buff *skb,
656 struct irlap_info *info, int command)
657{
658 IRDA_DEBUG(0, "%s()\n", __FUNCTION__);
659
660 info->nr = skb->data[1] >> 5;
661
662 /* Check if this is a command or a response frame */
663 if (command)
664 irlap_do_event(self, RECV_REJ_CMD, skb, info);
665 else
666 irlap_do_event(self, RECV_REJ_RSP, skb, info);
667}
668
669static void irlap_recv_srej_frame(struct irlap_cb *self, struct sk_buff *skb,
670 struct irlap_info *info, int command)
671{
672 IRDA_DEBUG(0, "%s()\n", __FUNCTION__);
673
674 info->nr = skb->data[1] >> 5;
675
676 /* Check if this is a command or a response frame */
677 if (command)
678 irlap_do_event(self, RECV_SREJ_CMD, skb, info);
679 else
680 irlap_do_event(self, RECV_SREJ_RSP, skb, info);
681}
682
683static void irlap_recv_disc_frame(struct irlap_cb *self, struct sk_buff *skb,
684 struct irlap_info *info, int command)
685{
686 IRDA_DEBUG(2, "%s()\n", __FUNCTION__);
687
688 /* Check if this is a command or a response frame */
689 if (command)
690 irlap_do_event(self, RECV_DISC_CMD, skb, info);
691 else
692 irlap_do_event(self, RECV_RD_RSP, skb, info);
693}
694
695/*
696 * Function irlap_recv_ua_frame (skb, frame)
697 *
698 * Received UA (Unnumbered Acknowledgement) frame
699 *
700 */
701static inline void irlap_recv_ua_frame(struct irlap_cb *self,
702 struct sk_buff *skb,
703 struct irlap_info *info)
704{
705 irlap_do_event(self, RECV_UA_RSP, skb, info);
706}
707
708/*
709 * Function irlap_send_data_primary(self, skb)
710 *
711 * Send I-frames as the primary station but without the poll bit set
712 *
713 */
714void irlap_send_data_primary(struct irlap_cb *self, struct sk_buff *skb)
715{
716 struct sk_buff *tx_skb;
717
718 if (skb->data[1] == I_FRAME) {
719
720 /*
721 * Insert frame sequence number (Vs) in control field before
722 * inserting into transmit window queue.
723 */
724 skb->data[1] = I_FRAME | (self->vs << 1);
725
726 /*
727 * Insert frame in store, in case of retransmissions
728 * Increase skb reference count, see irlap_do_event()
729 */
730 skb_get(skb);
731 skb_queue_tail(&self->wx_list, skb);
732
733 /* Copy buffer */
734 tx_skb = skb_clone(skb, GFP_ATOMIC);
735 if (tx_skb == NULL) {
736 return;
737 }
738
739 self->vs = (self->vs + 1) % 8;
740 self->ack_required = FALSE;
741 self->window -= 1;
742
743 irlap_send_i_frame( self, tx_skb, CMD_FRAME);
744 } else {
745 IRDA_DEBUG(4, "%s(), sending unreliable frame\n", __FUNCTION__);
746 irlap_send_ui_frame(self, skb_get(skb), self->caddr, CMD_FRAME);
747 self->window -= 1;
748 }
749}
750/*
751 * Function irlap_send_data_primary_poll (self, skb)
752 *
753 * Send I(nformation) frame as primary with poll bit set
754 */
755void irlap_send_data_primary_poll(struct irlap_cb *self, struct sk_buff *skb)
756{
757 struct sk_buff *tx_skb;
758 int transmission_time;
759
760 /* Stop P timer */
761 del_timer(&self->poll_timer);
762
763 /* Is this reliable or unreliable data? */
764 if (skb->data[1] == I_FRAME) {
765
766 /*
767 * Insert frame sequence number (Vs) in control field before
768 * inserting into transmit window queue.
769 */
770 skb->data[1] = I_FRAME | (self->vs << 1);
771
772 /*
773 * Insert frame in store, in case of retransmissions
774 * Increase skb reference count, see irlap_do_event()
775 */
776 skb_get(skb);
777 skb_queue_tail(&self->wx_list, skb);
778
779 /* Copy buffer */
780 tx_skb = skb_clone(skb, GFP_ATOMIC);
781 if (tx_skb == NULL) {
782 return;
783 }
784
785 /*
786 * Set poll bit if necessary. We do this to the copied
787 * skb, since retransmitted need to set or clear the poll
788 * bit depending on when they are sent.
789 */
790 tx_skb->data[1] |= PF_BIT;
791
792 self->vs = (self->vs + 1) % 8;
793 self->ack_required = FALSE;
794
795 irlap_send_i_frame(self, tx_skb, CMD_FRAME);
796 } else {
797 IRDA_DEBUG(4, "%s(), sending unreliable frame\n", __FUNCTION__);
798
799 if (self->ack_required) {
800 irlap_send_ui_frame(self, skb_get(skb), self->caddr, CMD_FRAME);
801 irlap_send_rr_frame(self, CMD_FRAME);
802 self->ack_required = FALSE;
803 } else {
804 skb->data[1] |= PF_BIT;
805 irlap_send_ui_frame(self, skb_get(skb), self->caddr, CMD_FRAME);
806 }
807 }
808
809 /* How much time we took for transmission of all frames.
810 * We don't know, so let assume we used the full window. Jean II */
811 transmission_time = self->final_timeout;
812
813 /* Reset parameter so that we can fill next window */
814 self->window = self->window_size;
815
816#ifdef CONFIG_IRDA_DYNAMIC_WINDOW
817 /* Remove what we have not used. Just do a prorata of the
818 * bytes left in window to window capacity.
819 * See max_line_capacities[][] in qos.c for details. Jean II */
820 transmission_time -= (self->final_timeout * self->bytes_left
821 / self->line_capacity);
822 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);
823
824 /* We are allowed to transmit a maximum number of bytes again. */
825 self->bytes_left = self->line_capacity;
826#endif /* CONFIG_IRDA_DYNAMIC_WINDOW */
827
828 /*
829 * The network layer has a intermediate buffer between IrLAP
830 * and the IrDA driver which can contain 8 frames. So, even
831 * though IrLAP is currently sending the *last* frame of the
832 * tx-window, the driver most likely has only just started
833 * sending the *first* frame of the same tx-window.
834 * I.e. we are always at the very begining of or Tx window.
835 * Now, we are supposed to set the final timer from the end
836 * of our tx-window to let the other peer reply. So, we need
837 * to add extra time to compensate for the fact that we
838 * are really at the start of tx-window, otherwise the final timer
839 * might expire before he can answer...
840 * Jean II
841 */
842 irlap_start_final_timer(self, self->final_timeout + transmission_time);
843
844 /*
845 * The clever amongst you might ask why we do this adjustement
846 * only here, and not in all the other cases in irlap_event.c.
847 * In all those other case, we only send a very short management
848 * frame (few bytes), so the adjustement would be lost in the
849 * noise...
850 * The exception of course is irlap_resend_rejected_frame().
851 * Jean II */
852}
853
854/*
855 * Function irlap_send_data_secondary_final (self, skb)
856 *
857 * Send I(nformation) frame as secondary with final bit set
858 *
859 */
860void irlap_send_data_secondary_final(struct irlap_cb *self,
861 struct sk_buff *skb)
862{
863 struct sk_buff *tx_skb = NULL;
864
865 IRDA_ASSERT(self != NULL, return;);
866 IRDA_ASSERT(self->magic == LAP_MAGIC, return;);
867 IRDA_ASSERT(skb != NULL, return;);
868
869 /* Is this reliable or unreliable data? */
870 if (skb->data[1] == I_FRAME) {
871
872 /*
873 * Insert frame sequence number (Vs) in control field before
874 * inserting into transmit window queue.
875 */
876 skb->data[1] = I_FRAME | (self->vs << 1);
877
878 /*
879 * Insert frame in store, in case of retransmissions
880 * Increase skb reference count, see irlap_do_event()
881 */
882 skb_get(skb);
883 skb_queue_tail(&self->wx_list, skb);
884
885 tx_skb = skb_clone(skb, GFP_ATOMIC);
886 if (tx_skb == NULL) {
887 return;
888 }
889
890 tx_skb->data[1] |= PF_BIT;
891
892 self->vs = (self->vs + 1) % 8;
893 self->ack_required = FALSE;
894
895 irlap_send_i_frame(self, tx_skb, RSP_FRAME);
896 } else {
897 if (self->ack_required) {
898 irlap_send_ui_frame(self, skb_get(skb), self->caddr, RSP_FRAME);
899 irlap_send_rr_frame(self, RSP_FRAME);
900 self->ack_required = FALSE;
901 } else {
902 skb->data[1] |= PF_BIT;
903 irlap_send_ui_frame(self, skb_get(skb), self->caddr, RSP_FRAME);
904 }
905 }
906
907 self->window = self->window_size;
908#ifdef CONFIG_IRDA_DYNAMIC_WINDOW
909 /* We are allowed to transmit a maximum number of bytes again. */
910 self->bytes_left = self->line_capacity;
911#endif /* CONFIG_IRDA_DYNAMIC_WINDOW */
912
913 irlap_start_wd_timer(self, self->wd_timeout);
914}
915
916/*
917 * Function irlap_send_data_secondary (self, skb)
918 *
919 * Send I(nformation) frame as secondary without final bit set
920 *
921 */
922void irlap_send_data_secondary(struct irlap_cb *self, struct sk_buff *skb)
923{
924 struct sk_buff *tx_skb = NULL;
925
926 /* Is this reliable or unreliable data? */
927 if (skb->data[1] == I_FRAME) {
928
929 /*
930 * Insert frame sequence number (Vs) in control field before
931 * inserting into transmit window queue.
932 */
933 skb->data[1] = I_FRAME | (self->vs << 1);
934
935 /*
936 * Insert frame in store, in case of retransmissions
937 * Increase skb reference count, see irlap_do_event()
938 */
939 skb_get(skb);
940 skb_queue_tail(&self->wx_list, skb);
941
942 tx_skb = skb_clone(skb, GFP_ATOMIC);
943 if (tx_skb == NULL) {
944 return;
945 }
946
947 self->vs = (self->vs + 1) % 8;
948 self->ack_required = FALSE;
949 self->window -= 1;
950
951 irlap_send_i_frame(self, tx_skb, RSP_FRAME);
952 } else {
953 irlap_send_ui_frame(self, skb_get(skb), self->caddr, RSP_FRAME);
954 self->window -= 1;
955 }
956}
957
958/*
959 * Function irlap_resend_rejected_frames (nr)
960 *
961 * Resend frames which has not been acknowledged. Should be safe to
962 * traverse the list without locking it since this function will only be
963 * called from interrupt context (BH)
964 */
965void irlap_resend_rejected_frames(struct irlap_cb *self, int command)
966{
967 struct sk_buff *tx_skb;
968 struct sk_buff *skb;
969 int count;
970
971 IRDA_ASSERT(self != NULL, return;);
972 IRDA_ASSERT(self->magic == LAP_MAGIC, return;);
973
974 /* Initialize variables */
975 count = skb_queue_len(&self->wx_list);
976
977 /* Resend unacknowledged frame(s) */
978 skb = skb_peek(&self->wx_list);
979 while (skb != NULL) {
980 irlap_wait_min_turn_around(self, &self->qos_tx);
981
982 /* We copy the skb to be retransmitted since we will have to
983 * modify it. Cloning will confuse packet sniffers
984 */
985 /* tx_skb = skb_clone( skb, GFP_ATOMIC); */
986 tx_skb = skb_copy(skb, GFP_ATOMIC);
987 if (!tx_skb) {
988 IRDA_DEBUG(0, "%s(), unable to copy\n", __FUNCTION__);
989 return;
990 }
991 /* Unlink tx_skb from list */
992 tx_skb->next = tx_skb->prev = NULL;
993 tx_skb->list = NULL;
994
995 /* Clear old Nr field + poll bit */
996 tx_skb->data[1] &= 0x0f;
997
998 /*
999 * Set poll bit on the last frame retransmitted
1000 */
1001 if (count-- == 1)
1002 tx_skb->data[1] |= PF_BIT; /* Set p/f bit */
1003 else
1004 tx_skb->data[1] &= ~PF_BIT; /* Clear p/f bit */
1005
1006 irlap_send_i_frame(self, tx_skb, command);
1007
1008 /*
1009 * If our skb is the last buffer in the list, then
1010 * we are finished, if not, move to the next sk-buffer
1011 */
1012 if (skb == skb_peek_tail(&self->wx_list))
1013 skb = NULL;
1014 else
1015 skb = skb->next;
1016 }
1017#if 0 /* Not yet */
1018 /*
1019 * We can now fill the window with additional data frames
1020 */
1021 while (skb_queue_len( &self->txq) > 0) {
1022
1023 IRDA_DEBUG(0, "%s(), sending additional frames!\n", __FUNCTION__);
1024 if ((skb_queue_len( &self->txq) > 0) &&
1025 (self->window > 0)) {
1026 skb = skb_dequeue( &self->txq);
1027 IRDA_ASSERT(skb != NULL, return;);
1028
1029 /*
1030 * If send window > 1 then send frame with pf
1031 * bit cleared
1032 */
1033 if ((self->window > 1) &&
1034 skb_queue_len(&self->txq) > 0)
1035 {
1036 irlap_send_data_primary(self, skb);
1037 } else {
1038 irlap_send_data_primary_poll(self, skb);
1039 }
1040 kfree_skb(skb);
1041 }
1042 }
1043#endif
1044}
1045
1046void irlap_resend_rejected_frame(struct irlap_cb *self, int command)
1047{
1048 struct sk_buff *tx_skb;
1049 struct sk_buff *skb;
1050
1051 IRDA_ASSERT(self != NULL, return;);
1052 IRDA_ASSERT(self->magic == LAP_MAGIC, return;);
1053
1054 /* Resend unacknowledged frame(s) */
1055 skb = skb_peek(&self->wx_list);
1056 if (skb != NULL) {
1057 irlap_wait_min_turn_around(self, &self->qos_tx);
1058
1059 /* We copy the skb to be retransmitted since we will have to
1060 * modify it. Cloning will confuse packet sniffers
1061 */
1062 /* tx_skb = skb_clone( skb, GFP_ATOMIC); */
1063 tx_skb = skb_copy(skb, GFP_ATOMIC);
1064 if (!tx_skb) {
1065 IRDA_DEBUG(0, "%s(), unable to copy\n", __FUNCTION__);
1066 return;
1067 }
1068 /* Unlink tx_skb from list */
1069 tx_skb->next = tx_skb->prev = NULL;
1070 tx_skb->list = NULL;
1071
1072 /* Clear old Nr field + poll bit */
1073 tx_skb->data[1] &= 0x0f;
1074
1075 /* Set poll/final bit */
1076 tx_skb->data[1] |= PF_BIT; /* Set p/f bit */
1077
1078 irlap_send_i_frame(self, tx_skb, command);
1079 }
1080}
1081
1082/*
1083 * Function irlap_send_ui_frame (self, skb, command)
1084 *
1085 * Contruct and transmit an Unnumbered Information (UI) frame
1086 *
1087 */
1088void irlap_send_ui_frame(struct irlap_cb *self, struct sk_buff *skb,
1089 __u8 caddr, int command)
1090{
1091 IRDA_DEBUG(4, "%s()\n", __FUNCTION__);
1092
1093 IRDA_ASSERT(self != NULL, return;);
1094 IRDA_ASSERT(self->magic == LAP_MAGIC, return;);
1095 IRDA_ASSERT(skb != NULL, return;);
1096
1097 /* Insert connection address */
1098 skb->data[0] = caddr | ((command) ? CMD_FRAME : 0);
1099
1100 irlap_queue_xmit(self, skb);
1101}
1102
1103/*
1104 * Function irlap_send_i_frame (skb)
1105 *
1106 * Contruct and transmit Information (I) frame
1107 */
1108static void irlap_send_i_frame(struct irlap_cb *self, struct sk_buff *skb,
1109 int command)
1110{
1111 /* Insert connection address */
1112 skb->data[0] = self->caddr;
1113 skb->data[0] |= (command) ? CMD_FRAME : 0;
1114
1115 /* Insert next to receive (Vr) */
1116 skb->data[1] |= (self->vr << 5); /* insert nr */
1117
1118 irlap_queue_xmit(self, skb);
1119}
1120
1121/*
1122 * Function irlap_recv_i_frame (skb, frame)
1123 *
1124 * Receive and parse an I (Information) frame, no harm in making it inline
1125 * since it's called only from one single place (irlap_driver_rcv).
1126 */
1127static inline void irlap_recv_i_frame(struct irlap_cb *self,
1128 struct sk_buff *skb,
1129 struct irlap_info *info, int command)
1130{
1131 info->nr = skb->data[1] >> 5; /* Next to receive */
1132 info->pf = skb->data[1] & PF_BIT; /* Final bit */
1133 info->ns = (skb->data[1] >> 1) & 0x07; /* Next to send */
1134
1135 /* Check if this is a command or a response frame */
1136 if (command)
1137 irlap_do_event(self, RECV_I_CMD, skb, info);
1138 else
1139 irlap_do_event(self, RECV_I_RSP, skb, info);
1140}
1141
1142/*
1143 * Function irlap_recv_ui_frame (self, skb, info)
1144 *
1145 * Receive and parse an Unnumbered Information (UI) frame
1146 *
1147 */
1148static void irlap_recv_ui_frame(struct irlap_cb *self, struct sk_buff *skb,
1149 struct irlap_info *info)
1150{
1151 IRDA_DEBUG( 4, "%s()\n", __FUNCTION__);
1152
1153 info->pf = skb->data[1] & PF_BIT; /* Final bit */
1154
1155 irlap_do_event(self, RECV_UI_FRAME, skb, info);
1156}
1157
1158/*
1159 * Function irlap_recv_frmr_frame (skb, frame)
1160 *
1161 * Received Frame Reject response.
1162 *
1163 */
1164static void irlap_recv_frmr_frame(struct irlap_cb *self, struct sk_buff *skb,
1165 struct irlap_info *info)
1166{
1167 __u8 *frame;
1168 int w, x, y, z;
1169
1170 IRDA_DEBUG(0, "%s()\n", __FUNCTION__);
1171
1172 IRDA_ASSERT(self != NULL, return;);
1173 IRDA_ASSERT(self->magic == LAP_MAGIC, return;);
1174 IRDA_ASSERT(skb != NULL, return;);
1175 IRDA_ASSERT(info != NULL, return;);
1176
1177 if (!pskb_may_pull(skb, 4)) {
1178 IRDA_ERROR("%s: frame to short!\n", __FUNCTION__);
1179 return;
1180 }
1181
1182 frame = skb->data;
1183
1184 info->nr = frame[2] >> 5; /* Next to receive */
1185 info->pf = frame[2] & PF_BIT; /* Final bit */
1186 info->ns = (frame[2] >> 1) & 0x07; /* Next to send */
1187
1188 w = frame[3] & 0x01;
1189 x = frame[3] & 0x02;
1190 y = frame[3] & 0x04;
1191 z = frame[3] & 0x08;
1192
1193 if (w) {
1194 IRDA_DEBUG(0, "Rejected control field is undefined or not "
1195 "implemented.\n");
1196 }
1197 if (x) {
1198 IRDA_DEBUG(0, "Rejected control field was invalid because it "
1199 "contained a non permitted I field.\n");
1200 }
1201 if (y) {
1202 IRDA_DEBUG(0, "Received I field exceeded the maximum negotiated "
1203 "for the existing connection or exceeded the maximum "
1204 "this station supports if no connection exists.\n");
1205 }
1206 if (z) {
1207 IRDA_DEBUG(0, "Rejected control field control field contained an "
1208 "invalid Nr count.\n");
1209 }
1210 irlap_do_event(self, RECV_FRMR_RSP, skb, info);
1211}
1212
1213/*
1214 * Function irlap_send_test_frame (self, daddr)
1215 *
1216 * Send a test frame response
1217 *
1218 */
1219void irlap_send_test_frame(struct irlap_cb *self, __u8 caddr, __u32 daddr,
1220 struct sk_buff *cmd)
1221{
1222 struct sk_buff *tx_skb;
1223 struct test_frame *frame;
1224 __u8 *info;
1225
1226 tx_skb = dev_alloc_skb(cmd->len+sizeof(struct test_frame));
1227 if (!tx_skb)
1228 return;
1229
1230 /* Broadcast frames must include saddr and daddr fields */
1231 if (caddr == CBROADCAST) {
1232 frame = (struct test_frame *)
1233 skb_put(tx_skb, sizeof(struct test_frame));
1234
1235 /* Insert the swapped addresses */
1236 frame->saddr = cpu_to_le32(self->saddr);
1237 frame->daddr = cpu_to_le32(daddr);
1238 } else
1239 frame = (struct test_frame *) skb_put(tx_skb, LAP_ADDR_HEADER + LAP_CTRL_HEADER);
1240
1241 frame->caddr = caddr;
1242 frame->control = TEST_RSP | PF_BIT;
1243
1244 /* Copy info */
1245 info = skb_put(tx_skb, cmd->len);
1246 memcpy(info, cmd->data, cmd->len);
1247
1248 /* Return to sender */
1249 irlap_wait_min_turn_around(self, &self->qos_tx);
1250 irlap_queue_xmit(self, tx_skb);
1251}
1252
1253/*
1254 * Function irlap_recv_test_frame (self, skb)
1255 *
1256 * Receive a test frame
1257 *
1258 */
1259static void irlap_recv_test_frame(struct irlap_cb *self, struct sk_buff *skb,
1260 struct irlap_info *info, int command)
1261{
1262 struct test_frame *frame;
1263
1264 IRDA_DEBUG(2, "%s()\n", __FUNCTION__);
1265
1266 if (!pskb_may_pull(skb, sizeof(*frame))) {
1267 IRDA_ERROR("%s: frame to short!\n", __FUNCTION__);
1268 return;
1269 }
1270 frame = (struct test_frame *) skb->data;
1271
1272 /* Broadcast frames must carry saddr and daddr fields */
1273 if (info->caddr == CBROADCAST) {
1274 if (skb->len < sizeof(struct test_frame)) {
1275 IRDA_DEBUG(0, "%s() test frame to short!\n",
1276 __FUNCTION__);
1277 return;
1278 }
1279
1280 /* Read and swap addresses */
1281 info->daddr = le32_to_cpu(frame->saddr);
1282 info->saddr = le32_to_cpu(frame->daddr);
1283
1284 /* Make sure frame is addressed to us */
1285 if ((info->saddr != self->saddr) &&
1286 (info->saddr != BROADCAST)) {
1287 return;
1288 }
1289 }
1290
1291 if (command)
1292 irlap_do_event(self, RECV_TEST_CMD, skb, info);
1293 else
1294 irlap_do_event(self, RECV_TEST_RSP, skb, info);
1295}
1296
1297/*
1298 * Function irlap_driver_rcv (skb, netdev, ptype)
1299 *
1300 * Called when a frame is received. Dispatches the right receive function
1301 * for processing of the frame.
1302 *
1303 * Note on skb management :
1304 * After calling the higher layers of the IrDA stack, we always
1305 * kfree() the skb, which drop the reference count (and potentially
1306 * destroy it).
1307 * If a higher layer of the stack want to keep the skb around (to put
1308 * in a queue or pass it to the higher layer), it will need to use
1309 * skb_get() to keep a reference on it. This is usually done at the
1310 * LMP level in irlmp.c.
1311 * Jean II
1312 */
1313int irlap_driver_rcv(struct sk_buff *skb, struct net_device *dev,
1314 struct packet_type *ptype)
1315{
1316 struct irlap_info info;
1317 struct irlap_cb *self;
1318 int command;
1319 __u8 control;
1320
1321 /* FIXME: should we get our own field? */
1322 self = (struct irlap_cb *) dev->atalk_ptr;
1323
1324 /* If the net device is down, then IrLAP is gone! */
1325 if (!self || self->magic != LAP_MAGIC) {
1326 dev_kfree_skb(skb);
1327 return -1;
1328 }
1329
1330 /* We are no longer an "old" protocol, so we need to handle
1331 * share and non linear skbs. This should never happen, so
1332 * we don't need to be clever about it. Jean II */
1333 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) {
1334 IRDA_ERROR("%s: can't clone shared skb!\n", __FUNCTION__);
1335 dev_kfree_skb(skb);
1336 return -1;
1337 }
1338
1339 /* Check if frame is large enough for parsing */
1340 if (!pskb_may_pull(skb, 2)) {
1341 IRDA_ERROR("%s: frame to short!\n", __FUNCTION__);
1342 dev_kfree_skb(skb);
1343 return -1;
1344 }
1345
1346 command = skb->data[0] & CMD_FRAME;
1347 info.caddr = skb->data[0] & CBROADCAST;
1348
1349 info.pf = skb->data[1] & PF_BIT;
1350 info.control = skb->data[1] & ~PF_BIT; /* Mask away poll/final bit */
1351
1352 control = info.control;
1353
1354 /* First we check if this frame has a valid connection address */
1355 if ((info.caddr != self->caddr) && (info.caddr != CBROADCAST)) {
1356 IRDA_DEBUG(0, "%s(), wrong connection address!\n",
1357 __FUNCTION__);
1358 goto out;
1359 }
1360 /*
1361 * Optimize for the common case and check if the frame is an
1362 * I(nformation) frame. Only I-frames have bit 0 set to 0
1363 */
1364 if (~control & 0x01) {
1365 irlap_recv_i_frame(self, skb, &info, command);
1366 goto out;
1367 }
1368 /*
1369 * We now check is the frame is an S(upervisory) frame. Only
1370 * S-frames have bit 0 set to 1 and bit 1 set to 0
1371 */
1372 if (~control & 0x02) {
1373 /*
1374 * Received S(upervisory) frame, check which frame type it is
1375 * only the first nibble is of interest
1376 */
1377 switch (control & 0x0f) {
1378 case RR:
1379 irlap_recv_rr_frame(self, skb, &info, command);
1380 break;
1381 case RNR:
1382 irlap_recv_rnr_frame(self, skb, &info, command);
1383 break;
1384 case REJ:
1385 irlap_recv_rej_frame(self, skb, &info, command);
1386 break;
1387 case SREJ:
1388 irlap_recv_srej_frame(self, skb, &info, command);
1389 break;
1390 default:
1391 IRDA_WARNING("%s: Unknown S-frame %02x received!\n",
1392 __FUNCTION__, info.control);
1393 break;
1394 }
1395 goto out;
1396 }
1397 /*
1398 * This must be a C(ontrol) frame
1399 */
1400 switch (control) {
1401 case XID_RSP:
1402 irlap_recv_discovery_xid_rsp(self, skb, &info);
1403 break;
1404 case XID_CMD:
1405 irlap_recv_discovery_xid_cmd(self, skb, &info);
1406 break;
1407 case SNRM_CMD:
1408 irlap_recv_snrm_cmd(self, skb, &info);
1409 break;
1410 case DM_RSP:
1411 irlap_do_event(self, RECV_DM_RSP, skb, &info);
1412 break;
1413 case DISC_CMD: /* And RD_RSP since they have the same value */
1414 irlap_recv_disc_frame(self, skb, &info, command);
1415 break;
1416 case TEST_CMD:
1417 irlap_recv_test_frame(self, skb, &info, command);
1418 break;
1419 case UA_RSP:
1420 irlap_recv_ua_frame(self, skb, &info);
1421 break;
1422 case FRMR_RSP:
1423 irlap_recv_frmr_frame(self, skb, &info);
1424 break;
1425 case UI_FRAME:
1426 irlap_recv_ui_frame(self, skb, &info);
1427 break;
1428 default:
1429 IRDA_WARNING("%s: Unknown frame %02x received!\n",
1430 __FUNCTION__, info.control);
1431 break;
1432 }
1433out:
1434 /* Always drop our reference on the skb */
1435 dev_kfree_skb(skb);
1436 return 0;
1437}
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-08 21:51:12 -0500