]>
git.proxmox.com Git - mirror_ubuntu-bionic-kernel.git/blob - net/irda/irlap_frame.c
1 /*********************************************************************
3 * Filename: irlap_frame.c
5 * Description: Build and transmit IrLAP frames
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>
29 #include <linux/if_ether.h>
30 #include <linux/netdevice.h>
31 #include <linux/irda.h>
33 #include <net/pkt_sched.h>
36 #include <asm/byteorder.h>
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>
46 static void irlap_send_i_frame(struct irlap_cb
*self
, struct sk_buff
*skb
,
50 * Function irlap_insert_info (self, skb)
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
56 static inline void irlap_insert_info(struct irlap_cb
*self
,
59 struct irda_skb_cb
*cb
= (struct irda_skb_cb
*) skb
->cb
;
62 * Insert MTT (min. turn time) and speed into skb, so that the
63 * device driver knows which settings to use
65 cb
->magic
= LAP_MAGIC
;
66 cb
->mtt
= self
->mtt_required
;
67 cb
->next_speed
= self
->speed
;
70 self
->mtt_required
= 0;
73 * Delay equals negotiated BOFs count, plus the number of BOFs to
74 * force the negotiated minimum turnaround time
76 cb
->xbofs
= self
->bofs_count
;
77 cb
->next_xbofs
= self
->next_bofs
;
78 cb
->xbofs_delay
= self
->xbofs_delay
;
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
;
87 * Function irlap_queue_xmit (self, skb)
89 * A little wrapper for dev_queue_xmit, so we can insert some common
92 void irlap_queue_xmit(struct irlap_cb
*self
, struct sk_buff
*skb
)
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
;
100 irlap_insert_info(self
, skb
);
106 * Function irlap_send_snrm_cmd (void)
108 * Transmits a connect SNRM command frame
110 void irlap_send_snrm_frame(struct irlap_cb
*self
, struct qos_info
*qos
)
112 struct sk_buff
*tx_skb
;
113 struct snrm_frame
*frame
;
116 IRDA_ASSERT(self
!= NULL
, return;);
117 IRDA_ASSERT(self
->magic
== LAP_MAGIC
, return;);
120 tx_skb
= alloc_skb(64, GFP_ATOMIC
);
124 frame
= (struct snrm_frame
*) skb_put(tx_skb
, 2);
126 /* Insert connection address field */
128 frame
->caddr
= CMD_FRAME
| CBROADCAST
;
130 frame
->caddr
= CMD_FRAME
| self
->caddr
;
132 /* Insert control field */
133 frame
->control
= SNRM_CMD
| PF_BIT
;
136 * If we are establishing a connection then insert QoS paramerters
139 skb_put(tx_skb
, 9); /* 21 left */
140 frame
->saddr
= cpu_to_le32(self
->saddr
);
141 frame
->daddr
= cpu_to_le32(self
->daddr
);
143 frame
->ncaddr
= self
->caddr
;
145 ret
= irlap_insert_qos_negotiation_params(self
, tx_skb
);
147 dev_kfree_skb(tx_skb
);
151 irlap_queue_xmit(self
, tx_skb
);
155 * Function irlap_recv_snrm_cmd (skb, info)
157 * Received SNRM (Set Normal Response Mode) command frame
160 static void irlap_recv_snrm_cmd(struct irlap_cb
*self
, struct sk_buff
*skb
,
161 struct irlap_info
*info
)
163 struct snrm_frame
*frame
;
165 if (pskb_may_pull(skb
,sizeof(struct snrm_frame
))) {
166 frame
= (struct snrm_frame
*) skb
->data
;
168 /* Copy the new connection address ignoring the C/R bit */
169 info
->caddr
= frame
->ncaddr
& 0xFE;
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",
178 /* Copy peer device address */
179 info
->daddr
= le32_to_cpu(frame
->saddr
);
180 info
->saddr
= le32_to_cpu(frame
->daddr
);
182 /* Only accept if addressed directly to us */
183 if (info
->saddr
!= self
->saddr
) {
184 IRDA_DEBUG(2, "%s(), not addressed to us!\n",
188 irlap_do_event(self
, RECV_SNRM_CMD
, skb
, info
);
190 /* Signal that this SNRM frame does not contain and I-field */
191 irlap_do_event(self
, RECV_SNRM_CMD
, skb
, NULL
);
196 * Function irlap_send_ua_response_frame (qos)
198 * Send UA (Unnumbered Acknowledgement) frame
201 void irlap_send_ua_response_frame(struct irlap_cb
*self
, struct qos_info
*qos
)
203 struct sk_buff
*tx_skb
;
204 struct ua_frame
*frame
;
207 IRDA_DEBUG(2, "%s() <%ld>\n", __FUNCTION__
, jiffies
);
209 IRDA_ASSERT(self
!= NULL
, return;);
210 IRDA_ASSERT(self
->magic
== LAP_MAGIC
, return;);
213 tx_skb
= alloc_skb(64, GFP_ATOMIC
);
217 frame
= (struct ua_frame
*) skb_put(tx_skb
, 10);
219 /* Build UA response */
220 frame
->caddr
= self
->caddr
;
221 frame
->control
= UA_RSP
| PF_BIT
;
223 frame
->saddr
= cpu_to_le32(self
->saddr
);
224 frame
->daddr
= cpu_to_le32(self
->daddr
);
226 /* Should we send QoS negotiation parameters? */
228 ret
= irlap_insert_qos_negotiation_params(self
, tx_skb
);
230 dev_kfree_skb(tx_skb
);
235 irlap_queue_xmit(self
, tx_skb
);
240 * Function irlap_send_dm_frame (void)
242 * Send disconnected mode (DM) frame
245 void irlap_send_dm_frame( struct irlap_cb
*self
)
247 struct sk_buff
*tx_skb
= NULL
;
250 IRDA_ASSERT(self
!= NULL
, return;);
251 IRDA_ASSERT(self
->magic
== LAP_MAGIC
, return;);
253 tx_skb
= alloc_skb(32, GFP_ATOMIC
);
257 frame
= skb_put(tx_skb
, 2);
259 if (self
->state
== LAP_NDM
)
260 frame
[0] = CBROADCAST
;
262 frame
[0] = self
->caddr
;
264 frame
[1] = DM_RSP
| PF_BIT
;
266 irlap_queue_xmit(self
, tx_skb
);
270 * Function irlap_send_disc_frame (void)
272 * Send disconnect (DISC) frame
275 void irlap_send_disc_frame(struct irlap_cb
*self
)
277 struct sk_buff
*tx_skb
= NULL
;
280 IRDA_DEBUG(3, "%s()\n", __FUNCTION__
);
282 IRDA_ASSERT(self
!= NULL
, return;);
283 IRDA_ASSERT(self
->magic
== LAP_MAGIC
, return;);
285 tx_skb
= alloc_skb(16, GFP_ATOMIC
);
289 frame
= skb_put(tx_skb
, 2);
291 frame
[0] = self
->caddr
| CMD_FRAME
;
292 frame
[1] = DISC_CMD
| PF_BIT
;
294 irlap_queue_xmit(self
, tx_skb
);
298 * Function irlap_send_discovery_xid_frame (S, s, command)
300 * Build and transmit a XID (eXchange station IDentifier) discovery
303 void irlap_send_discovery_xid_frame(struct irlap_cb
*self
, int S
, __u8 s
,
304 __u8 command
, discovery_t
*discovery
)
306 struct sk_buff
*tx_skb
= NULL
;
307 struct xid_frame
*frame
;
308 __u32 bcast
= BROADCAST
;
311 IRDA_DEBUG(4, "%s(), s=%d, S=%d, command=%d\n", __FUNCTION__
,
314 IRDA_ASSERT(self
!= NULL
, return;);
315 IRDA_ASSERT(self
->magic
== LAP_MAGIC
, return;);
316 IRDA_ASSERT(discovery
!= NULL
, return;);
318 tx_skb
= alloc_skb(64, GFP_ATOMIC
);
323 frame
= (struct xid_frame
*) tx_skb
->data
;
326 frame
->caddr
= CBROADCAST
| CMD_FRAME
;
327 frame
->control
= XID_CMD
| PF_BIT
;
329 frame
->caddr
= CBROADCAST
;
330 frame
->control
= XID_RSP
| PF_BIT
;
332 frame
->ident
= XID_FORMAT
;
334 frame
->saddr
= cpu_to_le32(self
->saddr
);
337 frame
->daddr
= cpu_to_le32(bcast
);
339 frame
->daddr
= cpu_to_le32(discovery
->data
.daddr
);
360 frame
->version
= 0x00;
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.
367 if (!command
|| (frame
->slotnr
== 0xff)) {
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];
375 info
= skb_put(tx_skb
, 1);
376 info
[0] = discovery
->data
.hints
[0];
378 info
= skb_put(tx_skb
, 1);
379 info
[0] = discovery
->data
.charset
;
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
);
385 irlap_queue_xmit(self
, tx_skb
);
389 * Function irlap_recv_discovery_xid_rsp (skb, info)
391 * Received a XID discovery response
394 static void irlap_recv_discovery_xid_rsp(struct irlap_cb
*self
,
396 struct irlap_info
*info
)
398 struct xid_frame
*xid
;
399 discovery_t
*discovery
= NULL
;
400 __u8
*discovery_info
;
403 IRDA_DEBUG(4, "%s()\n", __FUNCTION__
);
405 IRDA_ASSERT(self
!= NULL
, return;);
406 IRDA_ASSERT(self
->magic
== LAP_MAGIC
, return;);
408 if (!pskb_may_pull(skb
, sizeof(struct xid_frame
))) {
409 IRDA_ERROR("%s: frame to short!\n", __FUNCTION__
);
413 xid
= (struct xid_frame
*) skb
->data
;
415 info
->daddr
= le32_to_cpu(xid
->saddr
);
416 info
->saddr
= le32_to_cpu(xid
->daddr
);
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",
425 if ((discovery
= kzalloc(sizeof(discovery_t
), GFP_ATOMIC
)) == NULL
) {
426 IRDA_WARNING("%s: kmalloc failed!\n", __FUNCTION__
);
430 discovery
->data
.daddr
= info
->daddr
;
431 discovery
->data
.saddr
= self
->saddr
;
432 discovery
->timestamp
= jiffies
;
434 IRDA_DEBUG(4, "%s(), daddr=%08x\n", __FUNCTION__
,
435 discovery
->data
.daddr
);
437 discovery_info
= skb_pull(skb
, sizeof(struct xid_frame
));
439 /* Get info returned from peer */
440 discovery
->data
.hints
[0] = discovery_info
[0];
441 if (discovery_info
[0] & HINT_EXTENSION
) {
442 IRDA_DEBUG(4, "EXTENSION\n");
443 discovery
->data
.hints
[1] = discovery_info
[1];
444 discovery
->data
.charset
= discovery_info
[2];
445 text
= (char *) &discovery_info
[3];
447 discovery
->data
.hints
[1] = 0;
448 discovery
->data
.charset
= discovery_info
[1];
449 text
= (char *) &discovery_info
[2];
452 * Terminate info string, should be safe since this is where the
455 skb
->data
[skb
->len
] = '\0';
456 strncpy(discovery
->data
.info
, text
, NICKNAME_MAX_LEN
);
457 discovery
->name_len
= strlen(discovery
->data
.info
);
459 info
->discovery
= discovery
;
461 irlap_do_event(self
, RECV_DISCOVERY_XID_RSP
, skb
, info
);
465 * Function irlap_recv_discovery_xid_cmd (skb, info)
467 * Received a XID discovery command
470 static void irlap_recv_discovery_xid_cmd(struct irlap_cb
*self
,
472 struct irlap_info
*info
)
474 struct xid_frame
*xid
;
475 discovery_t
*discovery
= NULL
;
476 __u8
*discovery_info
;
479 if (!pskb_may_pull(skb
, sizeof(struct xid_frame
))) {
480 IRDA_ERROR("%s: frame to short!\n", __FUNCTION__
);
484 xid
= (struct xid_frame
*) skb
->data
;
486 info
->daddr
= le32_to_cpu(xid
->saddr
);
487 info
->saddr
= le32_to_cpu(xid
->daddr
);
489 /* Make sure frame is addressed to us */
490 if ((info
->saddr
!= self
->saddr
) && (info
->saddr
!= BROADCAST
)) {
491 IRDA_DEBUG(0, "%s(), frame is not addressed to us!\n",
496 switch (xid
->flags
& 0x03) {
513 info
->s
= xid
->slotnr
;
515 discovery_info
= skb_pull(skb
, sizeof(struct xid_frame
));
518 * Check if last frame
520 if (info
->s
== 0xff) {
521 /* Check if things are sane at this point... */
522 if((discovery_info
== NULL
) ||
523 !pskb_may_pull(skb
, 3)) {
524 IRDA_ERROR("%s: discovery frame to short!\n",
530 * We now have some discovery info to deliver!
532 discovery
= kmalloc(sizeof(discovery_t
), GFP_ATOMIC
);
534 IRDA_WARNING("%s: unable to malloc!\n", __FUNCTION__
);
538 discovery
->data
.daddr
= info
->daddr
;
539 discovery
->data
.saddr
= self
->saddr
;
540 discovery
->timestamp
= jiffies
;
542 discovery
->data
.hints
[0] = discovery_info
[0];
543 if (discovery_info
[0] & HINT_EXTENSION
) {
544 discovery
->data
.hints
[1] = discovery_info
[1];
545 discovery
->data
.charset
= discovery_info
[2];
546 text
= (char *) &discovery_info
[3];
548 discovery
->data
.hints
[1] = 0;
549 discovery
->data
.charset
= discovery_info
[1];
550 text
= (char *) &discovery_info
[2];
553 * Terminate string, should be safe since this is where the
556 skb
->data
[skb
->len
] = '\0';
557 strncpy(discovery
->data
.info
, text
, NICKNAME_MAX_LEN
);
558 discovery
->name_len
= strlen(discovery
->data
.info
);
560 info
->discovery
= discovery
;
562 info
->discovery
= NULL
;
564 irlap_do_event(self
, RECV_DISCOVERY_XID_CMD
, skb
, info
);
568 * Function irlap_send_rr_frame (self, command)
570 * Build and transmit RR (Receive Ready) frame. Notice that it is currently
571 * only possible to send RR frames with the poll bit set.
573 void irlap_send_rr_frame(struct irlap_cb
*self
, int command
)
575 struct sk_buff
*tx_skb
;
578 tx_skb
= alloc_skb(16, GFP_ATOMIC
);
582 frame
= skb_put(tx_skb
, 2);
584 frame
[0] = self
->caddr
;
585 frame
[0] |= (command
) ? CMD_FRAME
: 0;
587 frame
[1] = RR
| PF_BIT
| (self
->vr
<< 5);
589 irlap_queue_xmit(self
, tx_skb
);
593 * Function irlap_send_rd_frame (self)
595 * Request disconnect. Used by a secondary station to request the
596 * disconnection of the link.
598 void irlap_send_rd_frame(struct irlap_cb
*self
)
600 struct sk_buff
*tx_skb
;
603 tx_skb
= alloc_skb(16, GFP_ATOMIC
);
607 frame
= skb_put(tx_skb
, 2);
609 frame
[0] = self
->caddr
;
610 frame
[1] = RD_RSP
| PF_BIT
;
612 irlap_queue_xmit(self
, tx_skb
);
616 * Function irlap_recv_rr_frame (skb, info)
618 * Received RR (Receive Ready) frame from peer station, no harm in
619 * making it inline since its called only from one single place
620 * (irlap_driver_rcv).
622 static inline void irlap_recv_rr_frame(struct irlap_cb
*self
,
624 struct irlap_info
*info
, int command
)
626 info
->nr
= skb
->data
[1] >> 5;
628 /* Check if this is a command or a response frame */
630 irlap_do_event(self
, RECV_RR_CMD
, skb
, info
);
632 irlap_do_event(self
, RECV_RR_RSP
, skb
, info
);
636 * Function irlap_recv_rnr_frame (self, skb, info)
638 * Received RNR (Receive Not Ready) frame from peer station
641 static void irlap_recv_rnr_frame(struct irlap_cb
*self
, struct sk_buff
*skb
,
642 struct irlap_info
*info
, int command
)
644 info
->nr
= skb
->data
[1] >> 5;
646 IRDA_DEBUG(4, "%s(), nr=%d, %ld\n", __FUNCTION__
, info
->nr
, jiffies
);
649 irlap_do_event(self
, RECV_RNR_CMD
, skb
, info
);
651 irlap_do_event(self
, RECV_RNR_RSP
, skb
, info
);
654 static void irlap_recv_rej_frame(struct irlap_cb
*self
, struct sk_buff
*skb
,
655 struct irlap_info
*info
, int command
)
657 IRDA_DEBUG(0, "%s()\n", __FUNCTION__
);
659 info
->nr
= skb
->data
[1] >> 5;
661 /* Check if this is a command or a response frame */
663 irlap_do_event(self
, RECV_REJ_CMD
, skb
, info
);
665 irlap_do_event(self
, RECV_REJ_RSP
, skb
, info
);
668 static void irlap_recv_srej_frame(struct irlap_cb
*self
, struct sk_buff
*skb
,
669 struct irlap_info
*info
, int command
)
671 IRDA_DEBUG(0, "%s()\n", __FUNCTION__
);
673 info
->nr
= skb
->data
[1] >> 5;
675 /* Check if this is a command or a response frame */
677 irlap_do_event(self
, RECV_SREJ_CMD
, skb
, info
);
679 irlap_do_event(self
, RECV_SREJ_RSP
, skb
, info
);
682 static void irlap_recv_disc_frame(struct irlap_cb
*self
, struct sk_buff
*skb
,
683 struct irlap_info
*info
, int command
)
685 IRDA_DEBUG(2, "%s()\n", __FUNCTION__
);
687 /* Check if this is a command or a response frame */
689 irlap_do_event(self
, RECV_DISC_CMD
, skb
, info
);
691 irlap_do_event(self
, RECV_RD_RSP
, skb
, info
);
695 * Function irlap_recv_ua_frame (skb, frame)
697 * Received UA (Unnumbered Acknowledgement) frame
700 static inline void irlap_recv_ua_frame(struct irlap_cb
*self
,
702 struct irlap_info
*info
)
704 irlap_do_event(self
, RECV_UA_RSP
, skb
, info
);
708 * Function irlap_send_data_primary(self, skb)
710 * Send I-frames as the primary station but without the poll bit set
713 void irlap_send_data_primary(struct irlap_cb
*self
, struct sk_buff
*skb
)
715 struct sk_buff
*tx_skb
;
717 if (skb
->data
[1] == I_FRAME
) {
720 * Insert frame sequence number (Vs) in control field before
721 * inserting into transmit window queue.
723 skb
->data
[1] = I_FRAME
| (self
->vs
<< 1);
726 * Insert frame in store, in case of retransmissions
727 * Increase skb reference count, see irlap_do_event()
730 skb_queue_tail(&self
->wx_list
, skb
);
733 tx_skb
= skb_clone(skb
, GFP_ATOMIC
);
734 if (tx_skb
== NULL
) {
738 self
->vs
= (self
->vs
+ 1) % 8;
739 self
->ack_required
= FALSE
;
742 irlap_send_i_frame( self
, tx_skb
, CMD_FRAME
);
744 IRDA_DEBUG(4, "%s(), sending unreliable frame\n", __FUNCTION__
);
745 irlap_send_ui_frame(self
, skb_get(skb
), self
->caddr
, CMD_FRAME
);
750 * Function irlap_send_data_primary_poll (self, skb)
752 * Send I(nformation) frame as primary with poll bit set
754 void irlap_send_data_primary_poll(struct irlap_cb
*self
, struct sk_buff
*skb
)
756 struct sk_buff
*tx_skb
;
757 int transmission_time
;
760 del_timer(&self
->poll_timer
);
762 /* Is this reliable or unreliable data? */
763 if (skb
->data
[1] == I_FRAME
) {
766 * Insert frame sequence number (Vs) in control field before
767 * inserting into transmit window queue.
769 skb
->data
[1] = I_FRAME
| (self
->vs
<< 1);
772 * Insert frame in store, in case of retransmissions
773 * Increase skb reference count, see irlap_do_event()
776 skb_queue_tail(&self
->wx_list
, skb
);
779 tx_skb
= skb_clone(skb
, GFP_ATOMIC
);
780 if (tx_skb
== NULL
) {
785 * Set poll bit if necessary. We do this to the copied
786 * skb, since retransmitted need to set or clear the poll
787 * bit depending on when they are sent.
789 tx_skb
->data
[1] |= PF_BIT
;
791 self
->vs
= (self
->vs
+ 1) % 8;
792 self
->ack_required
= FALSE
;
794 irlap_send_i_frame(self
, tx_skb
, CMD_FRAME
);
796 IRDA_DEBUG(4, "%s(), sending unreliable frame\n", __FUNCTION__
);
798 if (self
->ack_required
) {
799 irlap_send_ui_frame(self
, skb_get(skb
), self
->caddr
, CMD_FRAME
);
800 irlap_send_rr_frame(self
, CMD_FRAME
);
801 self
->ack_required
= FALSE
;
803 skb
->data
[1] |= PF_BIT
;
804 irlap_send_ui_frame(self
, skb_get(skb
), self
->caddr
, CMD_FRAME
);
808 /* How much time we took for transmission of all frames.
809 * We don't know, so let assume we used the full window. Jean II */
810 transmission_time
= self
->final_timeout
;
812 /* Reset parameter so that we can fill next window */
813 self
->window
= self
->window_size
;
815 #ifdef CONFIG_IRDA_DYNAMIC_WINDOW
816 /* Remove what we have not used. Just do a prorata of the
817 * bytes left in window to window capacity.
818 * See max_line_capacities[][] in qos.c for details. Jean II */
819 transmission_time
-= (self
->final_timeout
* self
->bytes_left
820 / self
->line_capacity
);
821 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 /* We are allowed to transmit a maximum number of bytes again. */
824 self
->bytes_left
= self
->line_capacity
;
825 #endif /* CONFIG_IRDA_DYNAMIC_WINDOW */
828 * The network layer has a intermediate buffer between IrLAP
829 * and the IrDA driver which can contain 8 frames. So, even
830 * though IrLAP is currently sending the *last* frame of the
831 * tx-window, the driver most likely has only just started
832 * sending the *first* frame of the same tx-window.
833 * I.e. we are always at the very begining of or Tx window.
834 * Now, we are supposed to set the final timer from the end
835 * of our tx-window to let the other peer reply. So, we need
836 * to add extra time to compensate for the fact that we
837 * are really at the start of tx-window, otherwise the final timer
838 * might expire before he can answer...
841 irlap_start_final_timer(self
, self
->final_timeout
+ transmission_time
);
844 * The clever amongst you might ask why we do this adjustement
845 * only here, and not in all the other cases in irlap_event.c.
846 * In all those other case, we only send a very short management
847 * frame (few bytes), so the adjustement would be lost in the
849 * The exception of course is irlap_resend_rejected_frame().
854 * Function irlap_send_data_secondary_final (self, skb)
856 * Send I(nformation) frame as secondary with final bit set
859 void irlap_send_data_secondary_final(struct irlap_cb
*self
,
862 struct sk_buff
*tx_skb
= NULL
;
864 IRDA_ASSERT(self
!= NULL
, return;);
865 IRDA_ASSERT(self
->magic
== LAP_MAGIC
, return;);
866 IRDA_ASSERT(skb
!= NULL
, return;);
868 /* Is this reliable or unreliable data? */
869 if (skb
->data
[1] == I_FRAME
) {
872 * Insert frame sequence number (Vs) in control field before
873 * inserting into transmit window queue.
875 skb
->data
[1] = I_FRAME
| (self
->vs
<< 1);
878 * Insert frame in store, in case of retransmissions
879 * Increase skb reference count, see irlap_do_event()
882 skb_queue_tail(&self
->wx_list
, skb
);
884 tx_skb
= skb_clone(skb
, GFP_ATOMIC
);
885 if (tx_skb
== NULL
) {
889 tx_skb
->data
[1] |= PF_BIT
;
891 self
->vs
= (self
->vs
+ 1) % 8;
892 self
->ack_required
= FALSE
;
894 irlap_send_i_frame(self
, tx_skb
, RSP_FRAME
);
896 if (self
->ack_required
) {
897 irlap_send_ui_frame(self
, skb_get(skb
), self
->caddr
, RSP_FRAME
);
898 irlap_send_rr_frame(self
, RSP_FRAME
);
899 self
->ack_required
= FALSE
;
901 skb
->data
[1] |= PF_BIT
;
902 irlap_send_ui_frame(self
, skb_get(skb
), self
->caddr
, RSP_FRAME
);
906 self
->window
= self
->window_size
;
907 #ifdef CONFIG_IRDA_DYNAMIC_WINDOW
908 /* We are allowed to transmit a maximum number of bytes again. */
909 self
->bytes_left
= self
->line_capacity
;
910 #endif /* CONFIG_IRDA_DYNAMIC_WINDOW */
912 irlap_start_wd_timer(self
, self
->wd_timeout
);
916 * Function irlap_send_data_secondary (self, skb)
918 * Send I(nformation) frame as secondary without final bit set
921 void irlap_send_data_secondary(struct irlap_cb
*self
, struct sk_buff
*skb
)
923 struct sk_buff
*tx_skb
= NULL
;
925 /* Is this reliable or unreliable data? */
926 if (skb
->data
[1] == I_FRAME
) {
929 * Insert frame sequence number (Vs) in control field before
930 * inserting into transmit window queue.
932 skb
->data
[1] = I_FRAME
| (self
->vs
<< 1);
935 * Insert frame in store, in case of retransmissions
936 * Increase skb reference count, see irlap_do_event()
939 skb_queue_tail(&self
->wx_list
, skb
);
941 tx_skb
= skb_clone(skb
, GFP_ATOMIC
);
942 if (tx_skb
== NULL
) {
946 self
->vs
= (self
->vs
+ 1) % 8;
947 self
->ack_required
= FALSE
;
950 irlap_send_i_frame(self
, tx_skb
, RSP_FRAME
);
952 irlap_send_ui_frame(self
, skb_get(skb
), self
->caddr
, RSP_FRAME
);
958 * Function irlap_resend_rejected_frames (nr)
960 * Resend frames which has not been acknowledged. Should be safe to
961 * traverse the list without locking it since this function will only be
962 * called from interrupt context (BH)
964 void irlap_resend_rejected_frames(struct irlap_cb
*self
, int command
)
966 struct sk_buff
*tx_skb
;
970 IRDA_ASSERT(self
!= NULL
, return;);
971 IRDA_ASSERT(self
->magic
== LAP_MAGIC
, return;);
973 /* Initialize variables */
974 count
= skb_queue_len(&self
->wx_list
);
976 /* Resend unacknowledged frame(s) */
977 skb
= skb_peek(&self
->wx_list
);
978 while (skb
!= NULL
) {
979 irlap_wait_min_turn_around(self
, &self
->qos_tx
);
981 /* We copy the skb to be retransmitted since we will have to
982 * modify it. Cloning will confuse packet sniffers
984 /* tx_skb = skb_clone( skb, GFP_ATOMIC); */
985 tx_skb
= skb_copy(skb
, GFP_ATOMIC
);
987 IRDA_DEBUG(0, "%s(), unable to copy\n", __FUNCTION__
);
991 /* Clear old Nr field + poll bit */
992 tx_skb
->data
[1] &= 0x0f;
995 * Set poll bit on the last frame retransmitted
998 tx_skb
->data
[1] |= PF_BIT
; /* Set p/f bit */
1000 tx_skb
->data
[1] &= ~PF_BIT
; /* Clear p/f bit */
1002 irlap_send_i_frame(self
, tx_skb
, command
);
1005 * If our skb is the last buffer in the list, then
1006 * we are finished, if not, move to the next sk-buffer
1008 if (skb
== skb_peek_tail(&self
->wx_list
))
1015 * We can now fill the window with additional data frames
1017 while (!skb_queue_empty(&self
->txq
)) {
1019 IRDA_DEBUG(0, "%s(), sending additional frames!\n", __FUNCTION__
);
1020 if (self
->window
> 0) {
1021 skb
= skb_dequeue( &self
->txq
);
1022 IRDA_ASSERT(skb
!= NULL
, return;);
1025 * If send window > 1 then send frame with pf
1028 if ((self
->window
> 1) &&
1029 !skb_queue_empty(&self
->txq
)) {
1030 irlap_send_data_primary(self
, skb
);
1032 irlap_send_data_primary_poll(self
, skb
);
1040 void irlap_resend_rejected_frame(struct irlap_cb
*self
, int command
)
1042 struct sk_buff
*tx_skb
;
1043 struct sk_buff
*skb
;
1045 IRDA_ASSERT(self
!= NULL
, return;);
1046 IRDA_ASSERT(self
->magic
== LAP_MAGIC
, return;);
1048 /* Resend unacknowledged frame(s) */
1049 skb
= skb_peek(&self
->wx_list
);
1051 irlap_wait_min_turn_around(self
, &self
->qos_tx
);
1053 /* We copy the skb to be retransmitted since we will have to
1054 * modify it. Cloning will confuse packet sniffers
1056 /* tx_skb = skb_clone( skb, GFP_ATOMIC); */
1057 tx_skb
= skb_copy(skb
, GFP_ATOMIC
);
1059 IRDA_DEBUG(0, "%s(), unable to copy\n", __FUNCTION__
);
1063 /* Clear old Nr field + poll bit */
1064 tx_skb
->data
[1] &= 0x0f;
1066 /* Set poll/final bit */
1067 tx_skb
->data
[1] |= PF_BIT
; /* Set p/f bit */
1069 irlap_send_i_frame(self
, tx_skb
, command
);
1074 * Function irlap_send_ui_frame (self, skb, command)
1076 * Contruct and transmit an Unnumbered Information (UI) frame
1079 void irlap_send_ui_frame(struct irlap_cb
*self
, struct sk_buff
*skb
,
1080 __u8 caddr
, int command
)
1082 IRDA_DEBUG(4, "%s()\n", __FUNCTION__
);
1084 IRDA_ASSERT(self
!= NULL
, return;);
1085 IRDA_ASSERT(self
->magic
== LAP_MAGIC
, return;);
1086 IRDA_ASSERT(skb
!= NULL
, return;);
1088 /* Insert connection address */
1089 skb
->data
[0] = caddr
| ((command
) ? CMD_FRAME
: 0);
1091 irlap_queue_xmit(self
, skb
);
1095 * Function irlap_send_i_frame (skb)
1097 * Contruct and transmit Information (I) frame
1099 static void irlap_send_i_frame(struct irlap_cb
*self
, struct sk_buff
*skb
,
1102 /* Insert connection address */
1103 skb
->data
[0] = self
->caddr
;
1104 skb
->data
[0] |= (command
) ? CMD_FRAME
: 0;
1106 /* Insert next to receive (Vr) */
1107 skb
->data
[1] |= (self
->vr
<< 5); /* insert nr */
1109 irlap_queue_xmit(self
, skb
);
1113 * Function irlap_recv_i_frame (skb, frame)
1115 * Receive and parse an I (Information) frame, no harm in making it inline
1116 * since it's called only from one single place (irlap_driver_rcv).
1118 static inline void irlap_recv_i_frame(struct irlap_cb
*self
,
1119 struct sk_buff
*skb
,
1120 struct irlap_info
*info
, int command
)
1122 info
->nr
= skb
->data
[1] >> 5; /* Next to receive */
1123 info
->pf
= skb
->data
[1] & PF_BIT
; /* Final bit */
1124 info
->ns
= (skb
->data
[1] >> 1) & 0x07; /* Next to send */
1126 /* Check if this is a command or a response frame */
1128 irlap_do_event(self
, RECV_I_CMD
, skb
, info
);
1130 irlap_do_event(self
, RECV_I_RSP
, skb
, info
);
1134 * Function irlap_recv_ui_frame (self, skb, info)
1136 * Receive and parse an Unnumbered Information (UI) frame
1139 static void irlap_recv_ui_frame(struct irlap_cb
*self
, struct sk_buff
*skb
,
1140 struct irlap_info
*info
)
1142 IRDA_DEBUG( 4, "%s()\n", __FUNCTION__
);
1144 info
->pf
= skb
->data
[1] & PF_BIT
; /* Final bit */
1146 irlap_do_event(self
, RECV_UI_FRAME
, skb
, info
);
1150 * Function irlap_recv_frmr_frame (skb, frame)
1152 * Received Frame Reject response.
1155 static void irlap_recv_frmr_frame(struct irlap_cb
*self
, struct sk_buff
*skb
,
1156 struct irlap_info
*info
)
1161 IRDA_DEBUG(0, "%s()\n", __FUNCTION__
);
1163 IRDA_ASSERT(self
!= NULL
, return;);
1164 IRDA_ASSERT(self
->magic
== LAP_MAGIC
, return;);
1165 IRDA_ASSERT(skb
!= NULL
, return;);
1166 IRDA_ASSERT(info
!= NULL
, return;);
1168 if (!pskb_may_pull(skb
, 4)) {
1169 IRDA_ERROR("%s: frame to short!\n", __FUNCTION__
);
1175 info
->nr
= frame
[2] >> 5; /* Next to receive */
1176 info
->pf
= frame
[2] & PF_BIT
; /* Final bit */
1177 info
->ns
= (frame
[2] >> 1) & 0x07; /* Next to send */
1179 w
= frame
[3] & 0x01;
1180 x
= frame
[3] & 0x02;
1181 y
= frame
[3] & 0x04;
1182 z
= frame
[3] & 0x08;
1185 IRDA_DEBUG(0, "Rejected control field is undefined or not "
1189 IRDA_DEBUG(0, "Rejected control field was invalid because it "
1190 "contained a non permitted I field.\n");
1193 IRDA_DEBUG(0, "Received I field exceeded the maximum negotiated "
1194 "for the existing connection or exceeded the maximum "
1195 "this station supports if no connection exists.\n");
1198 IRDA_DEBUG(0, "Rejected control field control field contained an "
1199 "invalid Nr count.\n");
1201 irlap_do_event(self
, RECV_FRMR_RSP
, skb
, info
);
1205 * Function irlap_send_test_frame (self, daddr)
1207 * Send a test frame response
1210 void irlap_send_test_frame(struct irlap_cb
*self
, __u8 caddr
, __u32 daddr
,
1211 struct sk_buff
*cmd
)
1213 struct sk_buff
*tx_skb
;
1214 struct test_frame
*frame
;
1217 tx_skb
= alloc_skb(cmd
->len
+sizeof(struct test_frame
), GFP_ATOMIC
);
1221 /* Broadcast frames must include saddr and daddr fields */
1222 if (caddr
== CBROADCAST
) {
1223 frame
= (struct test_frame
*)
1224 skb_put(tx_skb
, sizeof(struct test_frame
));
1226 /* Insert the swapped addresses */
1227 frame
->saddr
= cpu_to_le32(self
->saddr
);
1228 frame
->daddr
= cpu_to_le32(daddr
);
1230 frame
= (struct test_frame
*) skb_put(tx_skb
, LAP_ADDR_HEADER
+ LAP_CTRL_HEADER
);
1232 frame
->caddr
= caddr
;
1233 frame
->control
= TEST_RSP
| PF_BIT
;
1236 info
= skb_put(tx_skb
, cmd
->len
);
1237 memcpy(info
, cmd
->data
, cmd
->len
);
1239 /* Return to sender */
1240 irlap_wait_min_turn_around(self
, &self
->qos_tx
);
1241 irlap_queue_xmit(self
, tx_skb
);
1245 * Function irlap_recv_test_frame (self, skb)
1247 * Receive a test frame
1250 static void irlap_recv_test_frame(struct irlap_cb
*self
, struct sk_buff
*skb
,
1251 struct irlap_info
*info
, int command
)
1253 struct test_frame
*frame
;
1255 IRDA_DEBUG(2, "%s()\n", __FUNCTION__
);
1257 if (!pskb_may_pull(skb
, sizeof(*frame
))) {
1258 IRDA_ERROR("%s: frame to short!\n", __FUNCTION__
);
1261 frame
= (struct test_frame
*) skb
->data
;
1263 /* Broadcast frames must carry saddr and daddr fields */
1264 if (info
->caddr
== CBROADCAST
) {
1265 if (skb
->len
< sizeof(struct test_frame
)) {
1266 IRDA_DEBUG(0, "%s() test frame to short!\n",
1271 /* Read and swap addresses */
1272 info
->daddr
= le32_to_cpu(frame
->saddr
);
1273 info
->saddr
= le32_to_cpu(frame
->daddr
);
1275 /* Make sure frame is addressed to us */
1276 if ((info
->saddr
!= self
->saddr
) &&
1277 (info
->saddr
!= BROADCAST
)) {
1283 irlap_do_event(self
, RECV_TEST_CMD
, skb
, info
);
1285 irlap_do_event(self
, RECV_TEST_RSP
, skb
, info
);
1289 * Function irlap_driver_rcv (skb, netdev, ptype)
1291 * Called when a frame is received. Dispatches the right receive function
1292 * for processing of the frame.
1294 * Note on skb management :
1295 * After calling the higher layers of the IrDA stack, we always
1296 * kfree() the skb, which drop the reference count (and potentially
1298 * If a higher layer of the stack want to keep the skb around (to put
1299 * in a queue or pass it to the higher layer), it will need to use
1300 * skb_get() to keep a reference on it. This is usually done at the
1301 * LMP level in irlmp.c.
1304 int irlap_driver_rcv(struct sk_buff
*skb
, struct net_device
*dev
,
1305 struct packet_type
*ptype
, struct net_device
*orig_dev
)
1307 struct irlap_info info
;
1308 struct irlap_cb
*self
;
1312 /* FIXME: should we get our own field? */
1313 self
= (struct irlap_cb
*) dev
->atalk_ptr
;
1315 /* If the net device is down, then IrLAP is gone! */
1316 if (!self
|| self
->magic
!= LAP_MAGIC
) {
1321 /* We are no longer an "old" protocol, so we need to handle
1322 * share and non linear skbs. This should never happen, so
1323 * we don't need to be clever about it. Jean II */
1324 if ((skb
= skb_share_check(skb
, GFP_ATOMIC
)) == NULL
) {
1325 IRDA_ERROR("%s: can't clone shared skb!\n", __FUNCTION__
);
1330 /* Check if frame is large enough for parsing */
1331 if (!pskb_may_pull(skb
, 2)) {
1332 IRDA_ERROR("%s: frame to short!\n", __FUNCTION__
);
1337 command
= skb
->data
[0] & CMD_FRAME
;
1338 info
.caddr
= skb
->data
[0] & CBROADCAST
;
1340 info
.pf
= skb
->data
[1] & PF_BIT
;
1341 info
.control
= skb
->data
[1] & ~PF_BIT
; /* Mask away poll/final bit */
1343 control
= info
.control
;
1345 /* First we check if this frame has a valid connection address */
1346 if ((info
.caddr
!= self
->caddr
) && (info
.caddr
!= CBROADCAST
)) {
1347 IRDA_DEBUG(0, "%s(), wrong connection address!\n",
1352 * Optimize for the common case and check if the frame is an
1353 * I(nformation) frame. Only I-frames have bit 0 set to 0
1355 if (~control
& 0x01) {
1356 irlap_recv_i_frame(self
, skb
, &info
, command
);
1360 * We now check is the frame is an S(upervisory) frame. Only
1361 * S-frames have bit 0 set to 1 and bit 1 set to 0
1363 if (~control
& 0x02) {
1365 * Received S(upervisory) frame, check which frame type it is
1366 * only the first nibble is of interest
1368 switch (control
& 0x0f) {
1370 irlap_recv_rr_frame(self
, skb
, &info
, command
);
1373 irlap_recv_rnr_frame(self
, skb
, &info
, command
);
1376 irlap_recv_rej_frame(self
, skb
, &info
, command
);
1379 irlap_recv_srej_frame(self
, skb
, &info
, command
);
1382 IRDA_WARNING("%s: Unknown S-frame %02x received!\n",
1383 __FUNCTION__
, info
.control
);
1389 * This must be a C(ontrol) frame
1393 irlap_recv_discovery_xid_rsp(self
, skb
, &info
);
1396 irlap_recv_discovery_xid_cmd(self
, skb
, &info
);
1399 irlap_recv_snrm_cmd(self
, skb
, &info
);
1402 irlap_do_event(self
, RECV_DM_RSP
, skb
, &info
);
1404 case DISC_CMD
: /* And RD_RSP since they have the same value */
1405 irlap_recv_disc_frame(self
, skb
, &info
, command
);
1408 irlap_recv_test_frame(self
, skb
, &info
, command
);
1411 irlap_recv_ua_frame(self
, skb
, &info
);
1414 irlap_recv_frmr_frame(self
, skb
, &info
);
1417 irlap_recv_ui_frame(self
, skb
, &info
);
1420 IRDA_WARNING("%s: Unknown frame %02x received!\n",
1421 __FUNCTION__
, info
.control
);
1425 /* Always drop our reference on the skb */