[media] lbdt3306a: rework at printk macros
[linux/fpc-iii.git] / net / irda / irlap_frame.c
blobb936b1251a66d11c4a1bdde2405f8303e3576c5d
1 /*********************************************************************
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>
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>
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.
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.
25 ********************************************************************/
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 #include <linux/slab.h>
34 #include <net/pkt_sched.h>
35 #include <net/sock.h>
37 #include <asm/byteorder.h>
39 #include <net/irda/irda.h>
40 #include <net/irda/irda_device.h>
41 #include <net/irda/irlap.h>
42 #include <net/irda/wrapper.h>
43 #include <net/irda/timer.h>
44 #include <net/irda/irlap_frame.h>
45 #include <net/irda/qos.h>
47 static void irlap_send_i_frame(struct irlap_cb *self, struct sk_buff *skb,
48 int command);
51 * Function irlap_insert_info (self, skb)
53 * Insert minimum turnaround time and speed information into the skb. We
54 * need to do this since it's per packet relevant information. Safe to
55 * have this function inlined since it's only called from one place
57 static inline void irlap_insert_info(struct irlap_cb *self,
58 struct sk_buff *skb)
60 struct irda_skb_cb *cb = (struct irda_skb_cb *) skb->cb;
63 * Insert MTT (min. turn time) and speed into skb, so that the
64 * device driver knows which settings to use
66 cb->magic = LAP_MAGIC;
67 cb->mtt = self->mtt_required;
68 cb->next_speed = self->speed;
70 /* Reset */
71 self->mtt_required = 0;
74 * Delay equals negotiated BOFs count, plus the number of BOFs to
75 * force the negotiated minimum turnaround time
77 cb->xbofs = self->bofs_count;
78 cb->next_xbofs = self->next_bofs;
79 cb->xbofs_delay = self->xbofs_delay;
81 /* Reset XBOF's delay (used only for getting min turn time) */
82 self->xbofs_delay = 0;
83 /* Put the correct xbofs value for the next packet */
84 self->bofs_count = self->next_bofs;
88 * Function irlap_queue_xmit (self, skb)
90 * A little wrapper for dev_queue_xmit, so we can insert some common
91 * code into it.
93 void irlap_queue_xmit(struct irlap_cb *self, struct sk_buff *skb)
95 /* Some common init stuff */
96 skb->dev = self->netdev;
97 skb_reset_mac_header(skb);
98 skb_reset_network_header(skb);
99 skb_reset_transport_header(skb);
100 skb->protocol = htons(ETH_P_IRDA);
101 skb->priority = TC_PRIO_BESTEFFORT;
103 irlap_insert_info(self, skb);
105 if (unlikely(self->mode & IRDA_MODE_MONITOR)) {
106 pr_debug("%s(): %s is in monitor mode\n", __func__,
107 self->netdev->name);
108 dev_kfree_skb(skb);
109 return;
112 dev_queue_xmit(skb);
116 * Function irlap_send_snrm_cmd (void)
118 * Transmits a connect SNRM command frame
120 void irlap_send_snrm_frame(struct irlap_cb *self, struct qos_info *qos)
122 struct sk_buff *tx_skb;
123 struct snrm_frame *frame;
124 int ret;
126 IRDA_ASSERT(self != NULL, return;);
127 IRDA_ASSERT(self->magic == LAP_MAGIC, return;);
129 /* Allocate frame */
130 tx_skb = alloc_skb(sizeof(struct snrm_frame) +
131 IRLAP_NEGOCIATION_PARAMS_LEN,
132 GFP_ATOMIC);
133 if (!tx_skb)
134 return;
136 frame = (struct snrm_frame *) skb_put(tx_skb, 2);
138 /* Insert connection address field */
139 if (qos)
140 frame->caddr = CMD_FRAME | CBROADCAST;
141 else
142 frame->caddr = CMD_FRAME | self->caddr;
144 /* Insert control field */
145 frame->control = SNRM_CMD | PF_BIT;
148 * If we are establishing a connection then insert QoS parameters
150 if (qos) {
151 skb_put(tx_skb, 9); /* 25 left */
152 frame->saddr = cpu_to_le32(self->saddr);
153 frame->daddr = cpu_to_le32(self->daddr);
155 frame->ncaddr = self->caddr;
157 ret = irlap_insert_qos_negotiation_params(self, tx_skb);
158 if (ret < 0) {
159 dev_kfree_skb(tx_skb);
160 return;
163 irlap_queue_xmit(self, tx_skb);
167 * Function irlap_recv_snrm_cmd (skb, info)
169 * Received SNRM (Set Normal Response Mode) command frame
172 static void irlap_recv_snrm_cmd(struct irlap_cb *self, struct sk_buff *skb,
173 struct irlap_info *info)
175 struct snrm_frame *frame;
177 if (pskb_may_pull(skb,sizeof(struct snrm_frame))) {
178 frame = (struct snrm_frame *) skb->data;
180 /* Copy the new connection address ignoring the C/R bit */
181 info->caddr = frame->ncaddr & 0xFE;
183 /* Check if the new connection address is valid */
184 if ((info->caddr == 0x00) || (info->caddr == 0xfe)) {
185 pr_debug("%s(), invalid connection address!\n",
186 __func__);
187 return;
190 /* Copy peer device address */
191 info->daddr = le32_to_cpu(frame->saddr);
192 info->saddr = le32_to_cpu(frame->daddr);
194 /* Only accept if addressed directly to us */
195 if (info->saddr != self->saddr) {
196 pr_debug("%s(), not addressed to us!\n",
197 __func__);
198 return;
200 irlap_do_event(self, RECV_SNRM_CMD, skb, info);
201 } else {
202 /* Signal that this SNRM frame does not contain and I-field */
203 irlap_do_event(self, RECV_SNRM_CMD, skb, NULL);
208 * Function irlap_send_ua_response_frame (qos)
210 * Send UA (Unnumbered Acknowledgement) frame
213 void irlap_send_ua_response_frame(struct irlap_cb *self, struct qos_info *qos)
215 struct sk_buff *tx_skb;
216 struct ua_frame *frame;
217 int ret;
219 pr_debug("%s() <%ld>\n", __func__, jiffies);
221 IRDA_ASSERT(self != NULL, return;);
222 IRDA_ASSERT(self->magic == LAP_MAGIC, return;);
224 /* Allocate frame */
225 tx_skb = alloc_skb(sizeof(struct ua_frame) +
226 IRLAP_NEGOCIATION_PARAMS_LEN,
227 GFP_ATOMIC);
228 if (!tx_skb)
229 return;
231 frame = (struct ua_frame *) skb_put(tx_skb, 10);
233 /* Build UA response */
234 frame->caddr = self->caddr;
235 frame->control = UA_RSP | PF_BIT;
237 frame->saddr = cpu_to_le32(self->saddr);
238 frame->daddr = cpu_to_le32(self->daddr);
240 /* Should we send QoS negotiation parameters? */
241 if (qos) {
242 ret = irlap_insert_qos_negotiation_params(self, tx_skb);
243 if (ret < 0) {
244 dev_kfree_skb(tx_skb);
245 return;
249 irlap_queue_xmit(self, tx_skb);
254 * Function irlap_send_dm_frame (void)
256 * Send disconnected mode (DM) frame
259 void irlap_send_dm_frame( struct irlap_cb *self)
261 struct sk_buff *tx_skb = NULL;
262 struct dm_frame *frame;
264 IRDA_ASSERT(self != NULL, return;);
265 IRDA_ASSERT(self->magic == LAP_MAGIC, return;);
267 tx_skb = alloc_skb(sizeof(struct dm_frame), GFP_ATOMIC);
268 if (!tx_skb)
269 return;
271 frame = (struct dm_frame *)skb_put(tx_skb, 2);
273 if (self->state == LAP_NDM)
274 frame->caddr = CBROADCAST;
275 else
276 frame->caddr = self->caddr;
278 frame->control = DM_RSP | PF_BIT;
280 irlap_queue_xmit(self, tx_skb);
284 * Function irlap_send_disc_frame (void)
286 * Send disconnect (DISC) frame
289 void irlap_send_disc_frame(struct irlap_cb *self)
291 struct sk_buff *tx_skb = NULL;
292 struct disc_frame *frame;
294 IRDA_ASSERT(self != NULL, return;);
295 IRDA_ASSERT(self->magic == LAP_MAGIC, return;);
297 tx_skb = alloc_skb(sizeof(struct disc_frame), GFP_ATOMIC);
298 if (!tx_skb)
299 return;
301 frame = (struct disc_frame *)skb_put(tx_skb, 2);
303 frame->caddr = self->caddr | CMD_FRAME;
304 frame->control = DISC_CMD | PF_BIT;
306 irlap_queue_xmit(self, tx_skb);
310 * Function irlap_send_discovery_xid_frame (S, s, command)
312 * Build and transmit a XID (eXchange station IDentifier) discovery
313 * frame.
315 void irlap_send_discovery_xid_frame(struct irlap_cb *self, int S, __u8 s,
316 __u8 command, discovery_t *discovery)
318 struct sk_buff *tx_skb = NULL;
319 struct xid_frame *frame;
320 __u32 bcast = BROADCAST;
321 __u8 *info;
323 pr_debug("%s(), s=%d, S=%d, command=%d\n", __func__,
324 s, S, command);
326 IRDA_ASSERT(self != NULL, return;);
327 IRDA_ASSERT(self->magic == LAP_MAGIC, return;);
328 IRDA_ASSERT(discovery != NULL, return;);
330 tx_skb = alloc_skb(sizeof(struct xid_frame) + IRLAP_DISCOVERY_INFO_LEN,
331 GFP_ATOMIC);
332 if (!tx_skb)
333 return;
335 skb_put(tx_skb, 14);
336 frame = (struct xid_frame *) tx_skb->data;
338 if (command) {
339 frame->caddr = CBROADCAST | CMD_FRAME;
340 frame->control = XID_CMD | PF_BIT;
341 } else {
342 frame->caddr = CBROADCAST;
343 frame->control = XID_RSP | PF_BIT;
345 frame->ident = XID_FORMAT;
347 frame->saddr = cpu_to_le32(self->saddr);
349 if (command)
350 frame->daddr = cpu_to_le32(bcast);
351 else
352 frame->daddr = cpu_to_le32(discovery->data.daddr);
354 switch (S) {
355 case 1:
356 frame->flags = 0x00;
357 break;
358 case 6:
359 frame->flags = 0x01;
360 break;
361 case 8:
362 frame->flags = 0x02;
363 break;
364 case 16:
365 frame->flags = 0x03;
366 break;
367 default:
368 frame->flags = 0x02;
369 break;
372 frame->slotnr = s;
373 frame->version = 0x00;
376 * Provide info for final slot only in commands, and for all
377 * responses. Send the second byte of the hint only if the
378 * EXTENSION bit is set in the first byte.
380 if (!command || (frame->slotnr == 0xff)) {
381 int len;
383 if (discovery->data.hints[0] & HINT_EXTENSION) {
384 info = skb_put(tx_skb, 2);
385 info[0] = discovery->data.hints[0];
386 info[1] = discovery->data.hints[1];
387 } else {
388 info = skb_put(tx_skb, 1);
389 info[0] = discovery->data.hints[0];
391 info = skb_put(tx_skb, 1);
392 info[0] = discovery->data.charset;
394 len = IRDA_MIN(discovery->name_len, skb_tailroom(tx_skb));
395 info = skb_put(tx_skb, len);
396 memcpy(info, discovery->data.info, len);
398 irlap_queue_xmit(self, tx_skb);
402 * Function irlap_recv_discovery_xid_rsp (skb, info)
404 * Received a XID discovery response
407 static void irlap_recv_discovery_xid_rsp(struct irlap_cb *self,
408 struct sk_buff *skb,
409 struct irlap_info *info)
411 struct xid_frame *xid;
412 discovery_t *discovery = NULL;
413 __u8 *discovery_info;
414 char *text;
416 IRDA_ASSERT(self != NULL, return;);
417 IRDA_ASSERT(self->magic == LAP_MAGIC, return;);
419 if (!pskb_may_pull(skb, sizeof(struct xid_frame))) {
420 net_err_ratelimited("%s: frame too short!\n", __func__);
421 return;
424 xid = (struct xid_frame *) skb->data;
426 info->daddr = le32_to_cpu(xid->saddr);
427 info->saddr = le32_to_cpu(xid->daddr);
429 /* Make sure frame is addressed to us */
430 if ((info->saddr != self->saddr) && (info->saddr != BROADCAST)) {
431 pr_debug("%s(), frame is not addressed to us!\n",
432 __func__);
433 return;
436 if ((discovery = kzalloc(sizeof(discovery_t), GFP_ATOMIC)) == NULL) {
437 net_warn_ratelimited("%s: kmalloc failed!\n", __func__);
438 return;
441 discovery->data.daddr = info->daddr;
442 discovery->data.saddr = self->saddr;
443 discovery->timestamp = jiffies;
445 pr_debug("%s(), daddr=%08x\n", __func__,
446 discovery->data.daddr);
448 discovery_info = skb_pull(skb, sizeof(struct xid_frame));
450 /* Get info returned from peer */
451 discovery->data.hints[0] = discovery_info[0];
452 if (discovery_info[0] & HINT_EXTENSION) {
453 pr_debug("EXTENSION\n");
454 discovery->data.hints[1] = discovery_info[1];
455 discovery->data.charset = discovery_info[2];
456 text = (char *) &discovery_info[3];
457 } else {
458 discovery->data.hints[1] = 0;
459 discovery->data.charset = discovery_info[1];
460 text = (char *) &discovery_info[2];
463 * Terminate info string, should be safe since this is where the
464 * FCS bytes resides.
466 skb->data[skb->len] = '\0';
467 strncpy(discovery->data.info, text, NICKNAME_MAX_LEN);
468 discovery->name_len = strlen(discovery->data.info);
470 info->discovery = discovery;
472 irlap_do_event(self, RECV_DISCOVERY_XID_RSP, skb, info);
476 * Function irlap_recv_discovery_xid_cmd (skb, info)
478 * Received a XID discovery command
481 static void irlap_recv_discovery_xid_cmd(struct irlap_cb *self,
482 struct sk_buff *skb,
483 struct irlap_info *info)
485 struct xid_frame *xid;
486 discovery_t *discovery = NULL;
487 __u8 *discovery_info;
488 char *text;
490 if (!pskb_may_pull(skb, sizeof(struct xid_frame))) {
491 net_err_ratelimited("%s: frame too short!\n", __func__);
492 return;
495 xid = (struct xid_frame *) skb->data;
497 info->daddr = le32_to_cpu(xid->saddr);
498 info->saddr = le32_to_cpu(xid->daddr);
500 /* Make sure frame is addressed to us */
501 if ((info->saddr != self->saddr) && (info->saddr != BROADCAST)) {
502 pr_debug("%s(), frame is not addressed to us!\n",
503 __func__);
504 return;
507 switch (xid->flags & 0x03) {
508 case 0x00:
509 info->S = 1;
510 break;
511 case 0x01:
512 info->S = 6;
513 break;
514 case 0x02:
515 info->S = 8;
516 break;
517 case 0x03:
518 info->S = 16;
519 break;
520 default:
521 /* Error!! */
522 return;
524 info->s = xid->slotnr;
526 discovery_info = skb_pull(skb, sizeof(struct xid_frame));
529 * Check if last frame
531 if (info->s == 0xff) {
532 /* Check if things are sane at this point... */
533 if((discovery_info == NULL) ||
534 !pskb_may_pull(skb, 3)) {
535 net_err_ratelimited("%s: discovery frame too short!\n",
536 __func__);
537 return;
541 * We now have some discovery info to deliver!
543 discovery = kzalloc(sizeof(discovery_t), GFP_ATOMIC);
544 if (!discovery)
545 return;
547 discovery->data.daddr = info->daddr;
548 discovery->data.saddr = self->saddr;
549 discovery->timestamp = jiffies;
551 discovery->data.hints[0] = discovery_info[0];
552 if (discovery_info[0] & HINT_EXTENSION) {
553 discovery->data.hints[1] = discovery_info[1];
554 discovery->data.charset = discovery_info[2];
555 text = (char *) &discovery_info[3];
556 } else {
557 discovery->data.hints[1] = 0;
558 discovery->data.charset = discovery_info[1];
559 text = (char *) &discovery_info[2];
562 * Terminate string, should be safe since this is where the
563 * FCS bytes resides.
565 skb->data[skb->len] = '\0';
566 strncpy(discovery->data.info, text, NICKNAME_MAX_LEN);
567 discovery->name_len = strlen(discovery->data.info);
569 info->discovery = discovery;
570 } else
571 info->discovery = NULL;
573 irlap_do_event(self, RECV_DISCOVERY_XID_CMD, skb, info);
577 * Function irlap_send_rr_frame (self, command)
579 * Build and transmit RR (Receive Ready) frame. Notice that it is currently
580 * only possible to send RR frames with the poll bit set.
582 void irlap_send_rr_frame(struct irlap_cb *self, int command)
584 struct sk_buff *tx_skb;
585 struct rr_frame *frame;
587 tx_skb = alloc_skb(sizeof(struct rr_frame), GFP_ATOMIC);
588 if (!tx_skb)
589 return;
591 frame = (struct rr_frame *)skb_put(tx_skb, 2);
593 frame->caddr = self->caddr;
594 frame->caddr |= (command) ? CMD_FRAME : 0;
596 frame->control = RR | PF_BIT | (self->vr << 5);
598 irlap_queue_xmit(self, tx_skb);
602 * Function irlap_send_rd_frame (self)
604 * Request disconnect. Used by a secondary station to request the
605 * disconnection of the link.
607 void irlap_send_rd_frame(struct irlap_cb *self)
609 struct sk_buff *tx_skb;
610 struct rd_frame *frame;
612 tx_skb = alloc_skb(sizeof(struct rd_frame), GFP_ATOMIC);
613 if (!tx_skb)
614 return;
616 frame = (struct rd_frame *)skb_put(tx_skb, 2);
618 frame->caddr = self->caddr;
619 frame->control = RD_RSP | PF_BIT;
621 irlap_queue_xmit(self, tx_skb);
625 * Function irlap_recv_rr_frame (skb, info)
627 * Received RR (Receive Ready) frame from peer station, no harm in
628 * making it inline since its called only from one single place
629 * (irlap_driver_rcv).
631 static inline void irlap_recv_rr_frame(struct irlap_cb *self,
632 struct sk_buff *skb,
633 struct irlap_info *info, int command)
635 info->nr = skb->data[1] >> 5;
637 /* Check if this is a command or a response frame */
638 if (command)
639 irlap_do_event(self, RECV_RR_CMD, skb, info);
640 else
641 irlap_do_event(self, RECV_RR_RSP, skb, info);
645 * Function irlap_recv_rnr_frame (self, skb, info)
647 * Received RNR (Receive Not Ready) frame from peer station
650 static void irlap_recv_rnr_frame(struct irlap_cb *self, struct sk_buff *skb,
651 struct irlap_info *info, int command)
653 info->nr = skb->data[1] >> 5;
655 pr_debug("%s(), nr=%d, %ld\n", __func__, info->nr, jiffies);
657 if (command)
658 irlap_do_event(self, RECV_RNR_CMD, skb, info);
659 else
660 irlap_do_event(self, RECV_RNR_RSP, skb, info);
663 static void irlap_recv_rej_frame(struct irlap_cb *self, struct sk_buff *skb,
664 struct irlap_info *info, int command)
666 info->nr = skb->data[1] >> 5;
668 /* Check if this is a command or a response frame */
669 if (command)
670 irlap_do_event(self, RECV_REJ_CMD, skb, info);
671 else
672 irlap_do_event(self, RECV_REJ_RSP, skb, info);
675 static void irlap_recv_srej_frame(struct irlap_cb *self, struct sk_buff *skb,
676 struct irlap_info *info, int command)
678 info->nr = skb->data[1] >> 5;
680 /* Check if this is a command or a response frame */
681 if (command)
682 irlap_do_event(self, RECV_SREJ_CMD, skb, info);
683 else
684 irlap_do_event(self, RECV_SREJ_RSP, skb, info);
687 static void irlap_recv_disc_frame(struct irlap_cb *self, struct sk_buff *skb,
688 struct irlap_info *info, int command)
690 /* Check if this is a command or a response frame */
691 if (command)
692 irlap_do_event(self, RECV_DISC_CMD, skb, info);
693 else
694 irlap_do_event(self, RECV_RD_RSP, skb, info);
698 * Function irlap_recv_ua_frame (skb, frame)
700 * Received UA (Unnumbered Acknowledgement) frame
703 static inline void irlap_recv_ua_frame(struct irlap_cb *self,
704 struct sk_buff *skb,
705 struct irlap_info *info)
707 irlap_do_event(self, RECV_UA_RSP, skb, info);
711 * Function irlap_send_data_primary(self, skb)
713 * Send I-frames as the primary station but without the poll bit set
716 void irlap_send_data_primary(struct irlap_cb *self, struct sk_buff *skb)
718 struct sk_buff *tx_skb;
720 if (skb->data[1] == I_FRAME) {
723 * Insert frame sequence number (Vs) in control field before
724 * inserting into transmit window queue.
726 skb->data[1] = I_FRAME | (self->vs << 1);
729 * Insert frame in store, in case of retransmissions
730 * Increase skb reference count, see irlap_do_event()
732 skb_get(skb);
733 skb_queue_tail(&self->wx_list, skb);
735 /* Copy buffer */
736 tx_skb = skb_clone(skb, GFP_ATOMIC);
737 if (tx_skb == NULL) {
738 return;
741 self->vs = (self->vs + 1) % 8;
742 self->ack_required = FALSE;
743 self->window -= 1;
745 irlap_send_i_frame( self, tx_skb, CMD_FRAME);
746 } else {
747 pr_debug("%s(), sending unreliable frame\n", __func__);
748 irlap_send_ui_frame(self, skb_get(skb), self->caddr, CMD_FRAME);
749 self->window -= 1;
753 * Function irlap_send_data_primary_poll (self, skb)
755 * Send I(nformation) frame as primary with poll bit set
757 void irlap_send_data_primary_poll(struct irlap_cb *self, struct sk_buff *skb)
759 struct sk_buff *tx_skb;
760 int transmission_time;
762 /* Stop P timer */
763 del_timer(&self->poll_timer);
765 /* Is this reliable or unreliable data? */
766 if (skb->data[1] == I_FRAME) {
769 * Insert frame sequence number (Vs) in control field before
770 * inserting into transmit window queue.
772 skb->data[1] = I_FRAME | (self->vs << 1);
775 * Insert frame in store, in case of retransmissions
776 * Increase skb reference count, see irlap_do_event()
778 skb_get(skb);
779 skb_queue_tail(&self->wx_list, skb);
781 /* Copy buffer */
782 tx_skb = skb_clone(skb, GFP_ATOMIC);
783 if (tx_skb == NULL) {
784 return;
788 * Set poll bit if necessary. We do this to the copied
789 * skb, since retransmitted need to set or clear the poll
790 * bit depending on when they are sent.
792 tx_skb->data[1] |= PF_BIT;
794 self->vs = (self->vs + 1) % 8;
795 self->ack_required = FALSE;
797 irlap_next_state(self, LAP_NRM_P);
798 irlap_send_i_frame(self, tx_skb, CMD_FRAME);
799 } else {
800 pr_debug("%s(), sending unreliable frame\n", __func__);
802 if (self->ack_required) {
803 irlap_send_ui_frame(self, skb_get(skb), self->caddr, CMD_FRAME);
804 irlap_next_state(self, LAP_NRM_P);
805 irlap_send_rr_frame(self, CMD_FRAME);
806 self->ack_required = FALSE;
807 } else {
808 skb->data[1] |= PF_BIT;
809 irlap_next_state(self, LAP_NRM_P);
810 irlap_send_ui_frame(self, skb_get(skb), self->caddr, CMD_FRAME);
814 /* How much time we took for transmission of all frames.
815 * We don't know, so let assume we used the full window. Jean II */
816 transmission_time = self->final_timeout;
818 /* Reset parameter so that we can fill next window */
819 self->window = self->window_size;
821 #ifdef CONFIG_IRDA_DYNAMIC_WINDOW
822 /* Remove what we have not used. Just do a prorata of the
823 * bytes left in window to window capacity.
824 * See max_line_capacities[][] in qos.c for details. Jean II */
825 transmission_time -= (self->final_timeout * self->bytes_left
826 / self->line_capacity);
827 pr_debug("%s() adjusting transmission_time : ft=%d, bl=%d, lc=%d -> tt=%d\n",
828 __func__, self->final_timeout, self->bytes_left,
829 self->line_capacity, transmission_time);
831 /* We are allowed to transmit a maximum number of bytes again. */
832 self->bytes_left = self->line_capacity;
833 #endif /* CONFIG_IRDA_DYNAMIC_WINDOW */
836 * The network layer has a intermediate buffer between IrLAP
837 * and the IrDA driver which can contain 8 frames. So, even
838 * though IrLAP is currently sending the *last* frame of the
839 * tx-window, the driver most likely has only just started
840 * sending the *first* frame of the same tx-window.
841 * I.e. we are always at the very beginning of or Tx window.
842 * Now, we are supposed to set the final timer from the end
843 * of our tx-window to let the other peer reply. So, we need
844 * to add extra time to compensate for the fact that we
845 * are really at the start of tx-window, otherwise the final timer
846 * might expire before he can answer...
847 * Jean II
849 irlap_start_final_timer(self, self->final_timeout + transmission_time);
852 * The clever amongst you might ask why we do this adjustement
853 * only here, and not in all the other cases in irlap_event.c.
854 * In all those other case, we only send a very short management
855 * frame (few bytes), so the adjustement would be lost in the
856 * noise...
857 * The exception of course is irlap_resend_rejected_frame().
858 * Jean II */
862 * Function irlap_send_data_secondary_final (self, skb)
864 * Send I(nformation) frame as secondary with final bit set
867 void irlap_send_data_secondary_final(struct irlap_cb *self,
868 struct sk_buff *skb)
870 struct sk_buff *tx_skb = NULL;
872 IRDA_ASSERT(self != NULL, return;);
873 IRDA_ASSERT(self->magic == LAP_MAGIC, return;);
874 IRDA_ASSERT(skb != NULL, return;);
876 /* Is this reliable or unreliable data? */
877 if (skb->data[1] == I_FRAME) {
880 * Insert frame sequence number (Vs) in control field before
881 * inserting into transmit window queue.
883 skb->data[1] = I_FRAME | (self->vs << 1);
886 * Insert frame in store, in case of retransmissions
887 * Increase skb reference count, see irlap_do_event()
889 skb_get(skb);
890 skb_queue_tail(&self->wx_list, skb);
892 tx_skb = skb_clone(skb, GFP_ATOMIC);
893 if (tx_skb == NULL) {
894 return;
897 tx_skb->data[1] |= PF_BIT;
899 self->vs = (self->vs + 1) % 8;
900 self->ack_required = FALSE;
902 irlap_send_i_frame(self, tx_skb, RSP_FRAME);
903 } else {
904 if (self->ack_required) {
905 irlap_send_ui_frame(self, skb_get(skb), self->caddr, RSP_FRAME);
906 irlap_send_rr_frame(self, RSP_FRAME);
907 self->ack_required = FALSE;
908 } else {
909 skb->data[1] |= PF_BIT;
910 irlap_send_ui_frame(self, skb_get(skb), self->caddr, RSP_FRAME);
914 self->window = self->window_size;
915 #ifdef CONFIG_IRDA_DYNAMIC_WINDOW
916 /* We are allowed to transmit a maximum number of bytes again. */
917 self->bytes_left = self->line_capacity;
918 #endif /* CONFIG_IRDA_DYNAMIC_WINDOW */
920 irlap_start_wd_timer(self, self->wd_timeout);
924 * Function irlap_send_data_secondary (self, skb)
926 * Send I(nformation) frame as secondary without final bit set
929 void irlap_send_data_secondary(struct irlap_cb *self, struct sk_buff *skb)
931 struct sk_buff *tx_skb = NULL;
933 /* Is this reliable or unreliable data? */
934 if (skb->data[1] == I_FRAME) {
937 * Insert frame sequence number (Vs) in control field before
938 * inserting into transmit window queue.
940 skb->data[1] = I_FRAME | (self->vs << 1);
943 * Insert frame in store, in case of retransmissions
944 * Increase skb reference count, see irlap_do_event()
946 skb_get(skb);
947 skb_queue_tail(&self->wx_list, skb);
949 tx_skb = skb_clone(skb, GFP_ATOMIC);
950 if (tx_skb == NULL) {
951 return;
954 self->vs = (self->vs + 1) % 8;
955 self->ack_required = FALSE;
956 self->window -= 1;
958 irlap_send_i_frame(self, tx_skb, RSP_FRAME);
959 } else {
960 irlap_send_ui_frame(self, skb_get(skb), self->caddr, RSP_FRAME);
961 self->window -= 1;
966 * Function irlap_resend_rejected_frames (nr)
968 * Resend frames which has not been acknowledged. Should be safe to
969 * traverse the list without locking it since this function will only be
970 * called from interrupt context (BH)
972 void irlap_resend_rejected_frames(struct irlap_cb *self, int command)
974 struct sk_buff *tx_skb;
975 struct sk_buff *skb;
977 IRDA_ASSERT(self != NULL, return;);
978 IRDA_ASSERT(self->magic == LAP_MAGIC, return;);
980 /* Resend unacknowledged frame(s) */
981 skb_queue_walk(&self->wx_list, skb) {
982 irlap_wait_min_turn_around(self, &self->qos_tx);
984 /* We copy the skb to be retransmitted since we will have to
985 * modify it. Cloning will confuse packet sniffers
987 /* tx_skb = skb_clone( skb, GFP_ATOMIC); */
988 tx_skb = skb_copy(skb, GFP_ATOMIC);
989 if (!tx_skb) {
990 pr_debug("%s(), unable to copy\n", __func__);
991 return;
994 /* Clear old Nr field + poll bit */
995 tx_skb->data[1] &= 0x0f;
998 * Set poll bit on the last frame retransmitted
1000 if (skb_queue_is_last(&self->wx_list, skb))
1001 tx_skb->data[1] |= PF_BIT; /* Set p/f bit */
1002 else
1003 tx_skb->data[1] &= ~PF_BIT; /* Clear p/f bit */
1005 irlap_send_i_frame(self, tx_skb, command);
1007 #if 0 /* Not yet */
1009 * We can now fill the window with additional data frames
1011 while (!skb_queue_empty(&self->txq)) {
1013 pr_debug("%s(), sending additional frames!\n", __func__);
1014 if (self->window > 0) {
1015 skb = skb_dequeue( &self->txq);
1016 IRDA_ASSERT(skb != NULL, return;);
1019 * If send window > 1 then send frame with pf
1020 * bit cleared
1022 if ((self->window > 1) &&
1023 !skb_queue_empty(&self->txq)) {
1024 irlap_send_data_primary(self, skb);
1025 } else {
1026 irlap_send_data_primary_poll(self, skb);
1028 kfree_skb(skb);
1031 #endif
1034 void irlap_resend_rejected_frame(struct irlap_cb *self, int command)
1036 struct sk_buff *tx_skb;
1037 struct sk_buff *skb;
1039 IRDA_ASSERT(self != NULL, return;);
1040 IRDA_ASSERT(self->magic == LAP_MAGIC, return;);
1042 /* Resend unacknowledged frame(s) */
1043 skb = skb_peek(&self->wx_list);
1044 if (skb != NULL) {
1045 irlap_wait_min_turn_around(self, &self->qos_tx);
1047 /* We copy the skb to be retransmitted since we will have to
1048 * modify it. Cloning will confuse packet sniffers
1050 /* tx_skb = skb_clone( skb, GFP_ATOMIC); */
1051 tx_skb = skb_copy(skb, GFP_ATOMIC);
1052 if (!tx_skb) {
1053 pr_debug("%s(), unable to copy\n", __func__);
1054 return;
1057 /* Clear old Nr field + poll bit */
1058 tx_skb->data[1] &= 0x0f;
1060 /* Set poll/final bit */
1061 tx_skb->data[1] |= PF_BIT; /* Set p/f bit */
1063 irlap_send_i_frame(self, tx_skb, command);
1068 * Function irlap_send_ui_frame (self, skb, command)
1070 * Contruct and transmit an Unnumbered Information (UI) frame
1073 void irlap_send_ui_frame(struct irlap_cb *self, struct sk_buff *skb,
1074 __u8 caddr, int command)
1076 IRDA_ASSERT(self != NULL, return;);
1077 IRDA_ASSERT(self->magic == LAP_MAGIC, return;);
1078 IRDA_ASSERT(skb != NULL, return;);
1080 /* Insert connection address */
1081 skb->data[0] = caddr | ((command) ? CMD_FRAME : 0);
1083 irlap_queue_xmit(self, skb);
1087 * Function irlap_send_i_frame (skb)
1089 * Contruct and transmit Information (I) frame
1091 static void irlap_send_i_frame(struct irlap_cb *self, struct sk_buff *skb,
1092 int command)
1094 /* Insert connection address */
1095 skb->data[0] = self->caddr;
1096 skb->data[0] |= (command) ? CMD_FRAME : 0;
1098 /* Insert next to receive (Vr) */
1099 skb->data[1] |= (self->vr << 5); /* insert nr */
1101 irlap_queue_xmit(self, skb);
1105 * Function irlap_recv_i_frame (skb, frame)
1107 * Receive and parse an I (Information) frame, no harm in making it inline
1108 * since it's called only from one single place (irlap_driver_rcv).
1110 static inline void irlap_recv_i_frame(struct irlap_cb *self,
1111 struct sk_buff *skb,
1112 struct irlap_info *info, int command)
1114 info->nr = skb->data[1] >> 5; /* Next to receive */
1115 info->pf = skb->data[1] & PF_BIT; /* Final bit */
1116 info->ns = (skb->data[1] >> 1) & 0x07; /* Next to send */
1118 /* Check if this is a command or a response frame */
1119 if (command)
1120 irlap_do_event(self, RECV_I_CMD, skb, info);
1121 else
1122 irlap_do_event(self, RECV_I_RSP, skb, info);
1126 * Function irlap_recv_ui_frame (self, skb, info)
1128 * Receive and parse an Unnumbered Information (UI) frame
1131 static void irlap_recv_ui_frame(struct irlap_cb *self, struct sk_buff *skb,
1132 struct irlap_info *info)
1134 info->pf = skb->data[1] & PF_BIT; /* Final bit */
1136 irlap_do_event(self, RECV_UI_FRAME, skb, info);
1140 * Function irlap_recv_frmr_frame (skb, frame)
1142 * Received Frame Reject response.
1145 static void irlap_recv_frmr_frame(struct irlap_cb *self, struct sk_buff *skb,
1146 struct irlap_info *info)
1148 __u8 *frame;
1149 int w, x, y, z;
1151 IRDA_ASSERT(self != NULL, return;);
1152 IRDA_ASSERT(self->magic == LAP_MAGIC, return;);
1153 IRDA_ASSERT(skb != NULL, return;);
1154 IRDA_ASSERT(info != NULL, return;);
1156 if (!pskb_may_pull(skb, 4)) {
1157 net_err_ratelimited("%s: frame too short!\n", __func__);
1158 return;
1161 frame = skb->data;
1163 info->nr = frame[2] >> 5; /* Next to receive */
1164 info->pf = frame[2] & PF_BIT; /* Final bit */
1165 info->ns = (frame[2] >> 1) & 0x07; /* Next to send */
1167 w = frame[3] & 0x01;
1168 x = frame[3] & 0x02;
1169 y = frame[3] & 0x04;
1170 z = frame[3] & 0x08;
1172 if (w) {
1173 pr_debug("Rejected control field is undefined or not implemented\n");
1175 if (x) {
1176 pr_debug("Rejected control field was invalid because it contained a non permitted I field\n");
1178 if (y) {
1179 pr_debug("Received I field exceeded the maximum negotiated for the existing connection or exceeded the maximum this station supports if no connection exists\n");
1181 if (z) {
1182 pr_debug("Rejected control field control field contained an invalid Nr count\n");
1184 irlap_do_event(self, RECV_FRMR_RSP, skb, info);
1188 * Function irlap_send_test_frame (self, daddr)
1190 * Send a test frame response
1193 void irlap_send_test_frame(struct irlap_cb *self, __u8 caddr, __u32 daddr,
1194 struct sk_buff *cmd)
1196 struct sk_buff *tx_skb;
1197 struct test_frame *frame;
1198 __u8 *info;
1200 tx_skb = alloc_skb(cmd->len + sizeof(struct test_frame), GFP_ATOMIC);
1201 if (!tx_skb)
1202 return;
1204 /* Broadcast frames must include saddr and daddr fields */
1205 if (caddr == CBROADCAST) {
1206 frame = (struct test_frame *)
1207 skb_put(tx_skb, sizeof(struct test_frame));
1209 /* Insert the swapped addresses */
1210 frame->saddr = cpu_to_le32(self->saddr);
1211 frame->daddr = cpu_to_le32(daddr);
1212 } else
1213 frame = (struct test_frame *) skb_put(tx_skb, LAP_ADDR_HEADER + LAP_CTRL_HEADER);
1215 frame->caddr = caddr;
1216 frame->control = TEST_RSP | PF_BIT;
1218 /* Copy info */
1219 info = skb_put(tx_skb, cmd->len);
1220 memcpy(info, cmd->data, cmd->len);
1222 /* Return to sender */
1223 irlap_wait_min_turn_around(self, &self->qos_tx);
1224 irlap_queue_xmit(self, tx_skb);
1228 * Function irlap_recv_test_frame (self, skb)
1230 * Receive a test frame
1233 static void irlap_recv_test_frame(struct irlap_cb *self, struct sk_buff *skb,
1234 struct irlap_info *info, int command)
1236 struct test_frame *frame;
1238 if (!pskb_may_pull(skb, sizeof(*frame))) {
1239 net_err_ratelimited("%s: frame too short!\n", __func__);
1240 return;
1242 frame = (struct test_frame *) skb->data;
1244 /* Broadcast frames must carry saddr and daddr fields */
1245 if (info->caddr == CBROADCAST) {
1246 if (skb->len < sizeof(struct test_frame)) {
1247 pr_debug("%s() test frame too short!\n",
1248 __func__);
1249 return;
1252 /* Read and swap addresses */
1253 info->daddr = le32_to_cpu(frame->saddr);
1254 info->saddr = le32_to_cpu(frame->daddr);
1256 /* Make sure frame is addressed to us */
1257 if ((info->saddr != self->saddr) &&
1258 (info->saddr != BROADCAST)) {
1259 return;
1263 if (command)
1264 irlap_do_event(self, RECV_TEST_CMD, skb, info);
1265 else
1266 irlap_do_event(self, RECV_TEST_RSP, skb, info);
1270 * Function irlap_driver_rcv (skb, netdev, ptype)
1272 * Called when a frame is received. Dispatches the right receive function
1273 * for processing of the frame.
1275 * Note on skb management :
1276 * After calling the higher layers of the IrDA stack, we always
1277 * kfree() the skb, which drop the reference count (and potentially
1278 * destroy it).
1279 * If a higher layer of the stack want to keep the skb around (to put
1280 * in a queue or pass it to the higher layer), it will need to use
1281 * skb_get() to keep a reference on it. This is usually done at the
1282 * LMP level in irlmp.c.
1283 * Jean II
1285 int irlap_driver_rcv(struct sk_buff *skb, struct net_device *dev,
1286 struct packet_type *ptype, struct net_device *orig_dev)
1288 struct irlap_info info;
1289 struct irlap_cb *self;
1290 int command;
1291 __u8 control;
1292 int ret = -1;
1294 if (!net_eq(dev_net(dev), &init_net))
1295 goto out;
1297 /* FIXME: should we get our own field? */
1298 self = (struct irlap_cb *) dev->atalk_ptr;
1300 /* If the net device is down, then IrLAP is gone! */
1301 if (!self || self->magic != LAP_MAGIC)
1302 goto err;
1304 /* We are no longer an "old" protocol, so we need to handle
1305 * share and non linear skbs. This should never happen, so
1306 * we don't need to be clever about it. Jean II */
1307 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) {
1308 net_err_ratelimited("%s: can't clone shared skb!\n", __func__);
1309 goto err;
1312 /* Check if frame is large enough for parsing */
1313 if (!pskb_may_pull(skb, 2)) {
1314 net_err_ratelimited("%s: frame too short!\n", __func__);
1315 goto err;
1318 command = skb->data[0] & CMD_FRAME;
1319 info.caddr = skb->data[0] & CBROADCAST;
1321 info.pf = skb->data[1] & PF_BIT;
1322 info.control = skb->data[1] & ~PF_BIT; /* Mask away poll/final bit */
1324 control = info.control;
1326 /* First we check if this frame has a valid connection address */
1327 if ((info.caddr != self->caddr) && (info.caddr != CBROADCAST)) {
1328 pr_debug("%s(), wrong connection address!\n",
1329 __func__);
1330 goto out;
1333 * Optimize for the common case and check if the frame is an
1334 * I(nformation) frame. Only I-frames have bit 0 set to 0
1336 if (~control & 0x01) {
1337 irlap_recv_i_frame(self, skb, &info, command);
1338 goto out;
1341 * We now check is the frame is an S(upervisory) frame. Only
1342 * S-frames have bit 0 set to 1 and bit 1 set to 0
1344 if (~control & 0x02) {
1346 * Received S(upervisory) frame, check which frame type it is
1347 * only the first nibble is of interest
1349 switch (control & 0x0f) {
1350 case RR:
1351 irlap_recv_rr_frame(self, skb, &info, command);
1352 break;
1353 case RNR:
1354 irlap_recv_rnr_frame(self, skb, &info, command);
1355 break;
1356 case REJ:
1357 irlap_recv_rej_frame(self, skb, &info, command);
1358 break;
1359 case SREJ:
1360 irlap_recv_srej_frame(self, skb, &info, command);
1361 break;
1362 default:
1363 net_warn_ratelimited("%s: Unknown S-frame %02x received!\n",
1364 __func__, info.control);
1365 break;
1367 goto out;
1370 * This must be a C(ontrol) frame
1372 switch (control) {
1373 case XID_RSP:
1374 irlap_recv_discovery_xid_rsp(self, skb, &info);
1375 break;
1376 case XID_CMD:
1377 irlap_recv_discovery_xid_cmd(self, skb, &info);
1378 break;
1379 case SNRM_CMD:
1380 irlap_recv_snrm_cmd(self, skb, &info);
1381 break;
1382 case DM_RSP:
1383 irlap_do_event(self, RECV_DM_RSP, skb, &info);
1384 break;
1385 case DISC_CMD: /* And RD_RSP since they have the same value */
1386 irlap_recv_disc_frame(self, skb, &info, command);
1387 break;
1388 case TEST_CMD:
1389 irlap_recv_test_frame(self, skb, &info, command);
1390 break;
1391 case UA_RSP:
1392 irlap_recv_ua_frame(self, skb, &info);
1393 break;
1394 case FRMR_RSP:
1395 irlap_recv_frmr_frame(self, skb, &info);
1396 break;
1397 case UI_FRAME:
1398 irlap_recv_ui_frame(self, skb, &info);
1399 break;
1400 default:
1401 net_warn_ratelimited("%s: Unknown frame %02x received!\n",
1402 __func__, info.control);
1403 break;
1405 out:
1406 ret = 0;
1407 err:
1408 /* Always drop our reference on the skb */
1409 dev_kfree_skb(skb);
1410 return ret;