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_reset_mac_header(skb
);
97 skb_reset_network_header(skb
);
98 skb_reset_transport_header(skb
);
99 skb
->protocol
= htons(ETH_P_IRDA
);
100 skb
->priority
= TC_PRIO_BESTEFFORT
;
102 irlap_insert_info(self
, skb
);
108 * Function irlap_send_snrm_cmd (void)
110 * Transmits a connect SNRM command frame
112 void irlap_send_snrm_frame(struct irlap_cb
*self
, struct qos_info
*qos
)
114 struct sk_buff
*tx_skb
;
115 struct snrm_frame
*frame
;
118 IRDA_ASSERT(self
!= NULL
, return;);
119 IRDA_ASSERT(self
->magic
== LAP_MAGIC
, return;);
122 tx_skb
= alloc_skb(sizeof(struct snrm_frame
) +
123 IRLAP_NEGOCIATION_PARAMS_LEN
,
128 frame
= (struct snrm_frame
*) skb_put(tx_skb
, 2);
130 /* Insert connection address field */
132 frame
->caddr
= CMD_FRAME
| CBROADCAST
;
134 frame
->caddr
= CMD_FRAME
| self
->caddr
;
136 /* Insert control field */
137 frame
->control
= SNRM_CMD
| PF_BIT
;
140 * If we are establishing a connection then insert QoS paramerters
143 skb_put(tx_skb
, 9); /* 25 left */
144 frame
->saddr
= cpu_to_le32(self
->saddr
);
145 frame
->daddr
= cpu_to_le32(self
->daddr
);
147 frame
->ncaddr
= self
->caddr
;
149 ret
= irlap_insert_qos_negotiation_params(self
, tx_skb
);
151 dev_kfree_skb(tx_skb
);
155 irlap_queue_xmit(self
, tx_skb
);
159 * Function irlap_recv_snrm_cmd (skb, info)
161 * Received SNRM (Set Normal Response Mode) command frame
164 static void irlap_recv_snrm_cmd(struct irlap_cb
*self
, struct sk_buff
*skb
,
165 struct irlap_info
*info
)
167 struct snrm_frame
*frame
;
169 if (pskb_may_pull(skb
,sizeof(struct snrm_frame
))) {
170 frame
= (struct snrm_frame
*) skb
->data
;
172 /* Copy the new connection address ignoring the C/R bit */
173 info
->caddr
= frame
->ncaddr
& 0xFE;
175 /* Check if the new connection address is valid */
176 if ((info
->caddr
== 0x00) || (info
->caddr
== 0xfe)) {
177 IRDA_DEBUG(3, "%s(), invalid connection address!\n",
182 /* Copy peer device address */
183 info
->daddr
= le32_to_cpu(frame
->saddr
);
184 info
->saddr
= le32_to_cpu(frame
->daddr
);
186 /* Only accept if addressed directly to us */
187 if (info
->saddr
!= self
->saddr
) {
188 IRDA_DEBUG(2, "%s(), not addressed to us!\n",
192 irlap_do_event(self
, RECV_SNRM_CMD
, skb
, info
);
194 /* Signal that this SNRM frame does not contain and I-field */
195 irlap_do_event(self
, RECV_SNRM_CMD
, skb
, NULL
);
200 * Function irlap_send_ua_response_frame (qos)
202 * Send UA (Unnumbered Acknowledgement) frame
205 void irlap_send_ua_response_frame(struct irlap_cb
*self
, struct qos_info
*qos
)
207 struct sk_buff
*tx_skb
;
208 struct ua_frame
*frame
;
211 IRDA_DEBUG(2, "%s() <%ld>\n", __FUNCTION__
, jiffies
);
213 IRDA_ASSERT(self
!= NULL
, return;);
214 IRDA_ASSERT(self
->magic
== LAP_MAGIC
, return;);
217 tx_skb
= alloc_skb(sizeof(struct ua_frame
) +
218 IRLAP_NEGOCIATION_PARAMS_LEN
,
223 frame
= (struct ua_frame
*) skb_put(tx_skb
, 10);
225 /* Build UA response */
226 frame
->caddr
= self
->caddr
;
227 frame
->control
= UA_RSP
| PF_BIT
;
229 frame
->saddr
= cpu_to_le32(self
->saddr
);
230 frame
->daddr
= cpu_to_le32(self
->daddr
);
232 /* Should we send QoS negotiation parameters? */
234 ret
= irlap_insert_qos_negotiation_params(self
, tx_skb
);
236 dev_kfree_skb(tx_skb
);
241 irlap_queue_xmit(self
, tx_skb
);
246 * Function irlap_send_dm_frame (void)
248 * Send disconnected mode (DM) frame
251 void irlap_send_dm_frame( struct irlap_cb
*self
)
253 struct sk_buff
*tx_skb
= NULL
;
254 struct dm_frame
*frame
;
256 IRDA_ASSERT(self
!= NULL
, return;);
257 IRDA_ASSERT(self
->magic
== LAP_MAGIC
, return;);
259 tx_skb
= alloc_skb(sizeof(struct dm_frame
), GFP_ATOMIC
);
263 frame
= (struct dm_frame
*)skb_put(tx_skb
, 2);
265 if (self
->state
== LAP_NDM
)
266 frame
->caddr
= CBROADCAST
;
268 frame
->caddr
= self
->caddr
;
270 frame
->control
= DM_RSP
| PF_BIT
;
272 irlap_queue_xmit(self
, tx_skb
);
276 * Function irlap_send_disc_frame (void)
278 * Send disconnect (DISC) frame
281 void irlap_send_disc_frame(struct irlap_cb
*self
)
283 struct sk_buff
*tx_skb
= NULL
;
284 struct disc_frame
*frame
;
286 IRDA_DEBUG(3, "%s()\n", __FUNCTION__
);
288 IRDA_ASSERT(self
!= NULL
, return;);
289 IRDA_ASSERT(self
->magic
== LAP_MAGIC
, return;);
291 tx_skb
= alloc_skb(sizeof(struct disc_frame
), GFP_ATOMIC
);
295 frame
= (struct disc_frame
*)skb_put(tx_skb
, 2);
297 frame
->caddr
= self
->caddr
| CMD_FRAME
;
298 frame
->control
= DISC_CMD
| PF_BIT
;
300 irlap_queue_xmit(self
, tx_skb
);
304 * Function irlap_send_discovery_xid_frame (S, s, command)
306 * Build and transmit a XID (eXchange station IDentifier) discovery
309 void irlap_send_discovery_xid_frame(struct irlap_cb
*self
, int S
, __u8 s
,
310 __u8 command
, discovery_t
*discovery
)
312 struct sk_buff
*tx_skb
= NULL
;
313 struct xid_frame
*frame
;
314 __u32 bcast
= BROADCAST
;
317 IRDA_DEBUG(4, "%s(), s=%d, S=%d, command=%d\n", __FUNCTION__
,
320 IRDA_ASSERT(self
!= NULL
, return;);
321 IRDA_ASSERT(self
->magic
== LAP_MAGIC
, return;);
322 IRDA_ASSERT(discovery
!= NULL
, return;);
324 tx_skb
= alloc_skb(sizeof(struct xid_frame
) + IRLAP_DISCOVERY_INFO_LEN
,
330 frame
= (struct xid_frame
*) tx_skb
->data
;
333 frame
->caddr
= CBROADCAST
| CMD_FRAME
;
334 frame
->control
= XID_CMD
| PF_BIT
;
336 frame
->caddr
= CBROADCAST
;
337 frame
->control
= XID_RSP
| PF_BIT
;
339 frame
->ident
= XID_FORMAT
;
341 frame
->saddr
= cpu_to_le32(self
->saddr
);
344 frame
->daddr
= cpu_to_le32(bcast
);
346 frame
->daddr
= cpu_to_le32(discovery
->data
.daddr
);
367 frame
->version
= 0x00;
370 * Provide info for final slot only in commands, and for all
371 * responses. Send the second byte of the hint only if the
372 * EXTENSION bit is set in the first byte.
374 if (!command
|| (frame
->slotnr
== 0xff)) {
377 if (discovery
->data
.hints
[0] & HINT_EXTENSION
) {
378 info
= skb_put(tx_skb
, 2);
379 info
[0] = discovery
->data
.hints
[0];
380 info
[1] = discovery
->data
.hints
[1];
382 info
= skb_put(tx_skb
, 1);
383 info
[0] = discovery
->data
.hints
[0];
385 info
= skb_put(tx_skb
, 1);
386 info
[0] = discovery
->data
.charset
;
388 len
= IRDA_MIN(discovery
->name_len
, skb_tailroom(tx_skb
));
389 info
= skb_put(tx_skb
, len
);
390 memcpy(info
, discovery
->data
.info
, len
);
392 irlap_queue_xmit(self
, tx_skb
);
396 * Function irlap_recv_discovery_xid_rsp (skb, info)
398 * Received a XID discovery response
401 static void irlap_recv_discovery_xid_rsp(struct irlap_cb
*self
,
403 struct irlap_info
*info
)
405 struct xid_frame
*xid
;
406 discovery_t
*discovery
= NULL
;
407 __u8
*discovery_info
;
410 IRDA_DEBUG(4, "%s()\n", __FUNCTION__
);
412 IRDA_ASSERT(self
!= NULL
, return;);
413 IRDA_ASSERT(self
->magic
== LAP_MAGIC
, return;);
415 if (!pskb_may_pull(skb
, sizeof(struct xid_frame
))) {
416 IRDA_ERROR("%s: frame too short!\n", __FUNCTION__
);
420 xid
= (struct xid_frame
*) skb
->data
;
422 info
->daddr
= le32_to_cpu(xid
->saddr
);
423 info
->saddr
= le32_to_cpu(xid
->daddr
);
425 /* Make sure frame is addressed to us */
426 if ((info
->saddr
!= self
->saddr
) && (info
->saddr
!= BROADCAST
)) {
427 IRDA_DEBUG(0, "%s(), frame is not addressed to us!\n",
432 if ((discovery
= kzalloc(sizeof(discovery_t
), GFP_ATOMIC
)) == NULL
) {
433 IRDA_WARNING("%s: kmalloc failed!\n", __FUNCTION__
);
437 discovery
->data
.daddr
= info
->daddr
;
438 discovery
->data
.saddr
= self
->saddr
;
439 discovery
->timestamp
= jiffies
;
441 IRDA_DEBUG(4, "%s(), daddr=%08x\n", __FUNCTION__
,
442 discovery
->data
.daddr
);
444 discovery_info
= skb_pull(skb
, sizeof(struct xid_frame
));
446 /* Get info returned from peer */
447 discovery
->data
.hints
[0] = discovery_info
[0];
448 if (discovery_info
[0] & HINT_EXTENSION
) {
449 IRDA_DEBUG(4, "EXTENSION\n");
450 discovery
->data
.hints
[1] = discovery_info
[1];
451 discovery
->data
.charset
= discovery_info
[2];
452 text
= (char *) &discovery_info
[3];
454 discovery
->data
.hints
[1] = 0;
455 discovery
->data
.charset
= discovery_info
[1];
456 text
= (char *) &discovery_info
[2];
459 * Terminate info string, should be safe since this is where the
462 skb
->data
[skb
->len
] = '\0';
463 strncpy(discovery
->data
.info
, text
, NICKNAME_MAX_LEN
);
464 discovery
->name_len
= strlen(discovery
->data
.info
);
466 info
->discovery
= discovery
;
468 irlap_do_event(self
, RECV_DISCOVERY_XID_RSP
, skb
, info
);
472 * Function irlap_recv_discovery_xid_cmd (skb, info)
474 * Received a XID discovery command
477 static void irlap_recv_discovery_xid_cmd(struct irlap_cb
*self
,
479 struct irlap_info
*info
)
481 struct xid_frame
*xid
;
482 discovery_t
*discovery
= NULL
;
483 __u8
*discovery_info
;
486 if (!pskb_may_pull(skb
, sizeof(struct xid_frame
))) {
487 IRDA_ERROR("%s: frame too short!\n", __FUNCTION__
);
491 xid
= (struct xid_frame
*) skb
->data
;
493 info
->daddr
= le32_to_cpu(xid
->saddr
);
494 info
->saddr
= le32_to_cpu(xid
->daddr
);
496 /* Make sure frame is addressed to us */
497 if ((info
->saddr
!= self
->saddr
) && (info
->saddr
!= BROADCAST
)) {
498 IRDA_DEBUG(0, "%s(), frame is not addressed to us!\n",
503 switch (xid
->flags
& 0x03) {
520 info
->s
= xid
->slotnr
;
522 discovery_info
= skb_pull(skb
, sizeof(struct xid_frame
));
525 * Check if last frame
527 if (info
->s
== 0xff) {
528 /* Check if things are sane at this point... */
529 if((discovery_info
== NULL
) ||
530 !pskb_may_pull(skb
, 3)) {
531 IRDA_ERROR("%s: discovery frame too short!\n",
537 * We now have some discovery info to deliver!
539 discovery
= kmalloc(sizeof(discovery_t
), GFP_ATOMIC
);
541 IRDA_WARNING("%s: unable to malloc!\n", __FUNCTION__
);
545 discovery
->data
.daddr
= info
->daddr
;
546 discovery
->data
.saddr
= self
->saddr
;
547 discovery
->timestamp
= jiffies
;
549 discovery
->data
.hints
[0] = discovery_info
[0];
550 if (discovery_info
[0] & HINT_EXTENSION
) {
551 discovery
->data
.hints
[1] = discovery_info
[1];
552 discovery
->data
.charset
= discovery_info
[2];
553 text
= (char *) &discovery_info
[3];
555 discovery
->data
.hints
[1] = 0;
556 discovery
->data
.charset
= discovery_info
[1];
557 text
= (char *) &discovery_info
[2];
560 * Terminate string, should be safe since this is where the
563 skb
->data
[skb
->len
] = '\0';
564 strncpy(discovery
->data
.info
, text
, NICKNAME_MAX_LEN
);
565 discovery
->name_len
= strlen(discovery
->data
.info
);
567 info
->discovery
= discovery
;
569 info
->discovery
= NULL
;
571 irlap_do_event(self
, RECV_DISCOVERY_XID_CMD
, skb
, info
);
575 * Function irlap_send_rr_frame (self, command)
577 * Build and transmit RR (Receive Ready) frame. Notice that it is currently
578 * only possible to send RR frames with the poll bit set.
580 void irlap_send_rr_frame(struct irlap_cb
*self
, int command
)
582 struct sk_buff
*tx_skb
;
583 struct rr_frame
*frame
;
585 tx_skb
= alloc_skb(sizeof(struct rr_frame
), GFP_ATOMIC
);
589 frame
= (struct rr_frame
*)skb_put(tx_skb
, 2);
591 frame
->caddr
= self
->caddr
;
592 frame
->caddr
|= (command
) ? CMD_FRAME
: 0;
594 frame
->control
= RR
| PF_BIT
| (self
->vr
<< 5);
596 irlap_queue_xmit(self
, tx_skb
);
600 * Function irlap_send_rd_frame (self)
602 * Request disconnect. Used by a secondary station to request the
603 * disconnection of the link.
605 void irlap_send_rd_frame(struct irlap_cb
*self
)
607 struct sk_buff
*tx_skb
;
608 struct rd_frame
*frame
;
610 tx_skb
= alloc_skb(sizeof(struct rd_frame
), GFP_ATOMIC
);
614 frame
= (struct rd_frame
*)skb_put(tx_skb
, 2);
616 frame
->caddr
= self
->caddr
;
617 frame
->caddr
= RD_RSP
| PF_BIT
;
619 irlap_queue_xmit(self
, tx_skb
);
623 * Function irlap_recv_rr_frame (skb, info)
625 * Received RR (Receive Ready) frame from peer station, no harm in
626 * making it inline since its called only from one single place
627 * (irlap_driver_rcv).
629 static inline void irlap_recv_rr_frame(struct irlap_cb
*self
,
631 struct irlap_info
*info
, int command
)
633 info
->nr
= skb
->data
[1] >> 5;
635 /* Check if this is a command or a response frame */
637 irlap_do_event(self
, RECV_RR_CMD
, skb
, info
);
639 irlap_do_event(self
, RECV_RR_RSP
, skb
, info
);
643 * Function irlap_recv_rnr_frame (self, skb, info)
645 * Received RNR (Receive Not Ready) frame from peer station
648 static void irlap_recv_rnr_frame(struct irlap_cb
*self
, struct sk_buff
*skb
,
649 struct irlap_info
*info
, int command
)
651 info
->nr
= skb
->data
[1] >> 5;
653 IRDA_DEBUG(4, "%s(), nr=%d, %ld\n", __FUNCTION__
, info
->nr
, jiffies
);
656 irlap_do_event(self
, RECV_RNR_CMD
, skb
, info
);
658 irlap_do_event(self
, RECV_RNR_RSP
, skb
, info
);
661 static void irlap_recv_rej_frame(struct irlap_cb
*self
, struct sk_buff
*skb
,
662 struct irlap_info
*info
, int command
)
664 IRDA_DEBUG(0, "%s()\n", __FUNCTION__
);
666 info
->nr
= skb
->data
[1] >> 5;
668 /* Check if this is a command or a response frame */
670 irlap_do_event(self
, RECV_REJ_CMD
, skb
, info
);
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 IRDA_DEBUG(0, "%s()\n", __FUNCTION__
);
680 info
->nr
= skb
->data
[1] >> 5;
682 /* Check if this is a command or a response frame */
684 irlap_do_event(self
, RECV_SREJ_CMD
, skb
, info
);
686 irlap_do_event(self
, RECV_SREJ_RSP
, skb
, info
);
689 static void irlap_recv_disc_frame(struct irlap_cb
*self
, struct sk_buff
*skb
,
690 struct irlap_info
*info
, int command
)
692 IRDA_DEBUG(2, "%s()\n", __FUNCTION__
);
694 /* Check if this is a command or a response frame */
696 irlap_do_event(self
, RECV_DISC_CMD
, skb
, info
);
698 irlap_do_event(self
, RECV_RD_RSP
, skb
, info
);
702 * Function irlap_recv_ua_frame (skb, frame)
704 * Received UA (Unnumbered Acknowledgement) frame
707 static inline void irlap_recv_ua_frame(struct irlap_cb
*self
,
709 struct irlap_info
*info
)
711 irlap_do_event(self
, RECV_UA_RSP
, skb
, info
);
715 * Function irlap_send_data_primary(self, skb)
717 * Send I-frames as the primary station but without the poll bit set
720 void irlap_send_data_primary(struct irlap_cb
*self
, struct sk_buff
*skb
)
722 struct sk_buff
*tx_skb
;
724 if (skb
->data
[1] == I_FRAME
) {
727 * Insert frame sequence number (Vs) in control field before
728 * inserting into transmit window queue.
730 skb
->data
[1] = I_FRAME
| (self
->vs
<< 1);
733 * Insert frame in store, in case of retransmissions
734 * Increase skb reference count, see irlap_do_event()
737 skb_queue_tail(&self
->wx_list
, skb
);
740 tx_skb
= skb_clone(skb
, GFP_ATOMIC
);
741 if (tx_skb
== NULL
) {
745 self
->vs
= (self
->vs
+ 1) % 8;
746 self
->ack_required
= FALSE
;
749 irlap_send_i_frame( self
, tx_skb
, CMD_FRAME
);
751 IRDA_DEBUG(4, "%s(), sending unreliable frame\n", __FUNCTION__
);
752 irlap_send_ui_frame(self
, skb_get(skb
), self
->caddr
, CMD_FRAME
);
757 * Function irlap_send_data_primary_poll (self, skb)
759 * Send I(nformation) frame as primary with poll bit set
761 void irlap_send_data_primary_poll(struct irlap_cb
*self
, struct sk_buff
*skb
)
763 struct sk_buff
*tx_skb
;
764 int transmission_time
;
767 del_timer(&self
->poll_timer
);
769 /* Is this reliable or unreliable data? */
770 if (skb
->data
[1] == I_FRAME
) {
773 * Insert frame sequence number (Vs) in control field before
774 * inserting into transmit window queue.
776 skb
->data
[1] = I_FRAME
| (self
->vs
<< 1);
779 * Insert frame in store, in case of retransmissions
780 * Increase skb reference count, see irlap_do_event()
783 skb_queue_tail(&self
->wx_list
, skb
);
786 tx_skb
= skb_clone(skb
, GFP_ATOMIC
);
787 if (tx_skb
== NULL
) {
792 * Set poll bit if necessary. We do this to the copied
793 * skb, since retransmitted need to set or clear the poll
794 * bit depending on when they are sent.
796 tx_skb
->data
[1] |= PF_BIT
;
798 self
->vs
= (self
->vs
+ 1) % 8;
799 self
->ack_required
= FALSE
;
801 irlap_send_i_frame(self
, tx_skb
, CMD_FRAME
);
803 IRDA_DEBUG(4, "%s(), sending unreliable frame\n", __FUNCTION__
);
805 if (self
->ack_required
) {
806 irlap_send_ui_frame(self
, skb_get(skb
), self
->caddr
, CMD_FRAME
);
807 irlap_send_rr_frame(self
, CMD_FRAME
);
808 self
->ack_required
= FALSE
;
810 skb
->data
[1] |= PF_BIT
;
811 irlap_send_ui_frame(self
, skb_get(skb
), self
->caddr
, CMD_FRAME
);
815 /* How much time we took for transmission of all frames.
816 * We don't know, so let assume we used the full window. Jean II */
817 transmission_time
= self
->final_timeout
;
819 /* Reset parameter so that we can fill next window */
820 self
->window
= self
->window_size
;
822 #ifdef CONFIG_IRDA_DYNAMIC_WINDOW
823 /* Remove what we have not used. Just do a prorata of the
824 * bytes left in window to window capacity.
825 * See max_line_capacities[][] in qos.c for details. Jean II */
826 transmission_time
-= (self
->final_timeout
* self
->bytes_left
827 / self
->line_capacity
);
828 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
);
830 /* We are allowed to transmit a maximum number of bytes again. */
831 self
->bytes_left
= self
->line_capacity
;
832 #endif /* CONFIG_IRDA_DYNAMIC_WINDOW */
835 * The network layer has a intermediate buffer between IrLAP
836 * and the IrDA driver which can contain 8 frames. So, even
837 * though IrLAP is currently sending the *last* frame of the
838 * tx-window, the driver most likely has only just started
839 * sending the *first* frame of the same tx-window.
840 * I.e. we are always at the very begining of or Tx window.
841 * Now, we are supposed to set the final timer from the end
842 * of our tx-window to let the other peer reply. So, we need
843 * to add extra time to compensate for the fact that we
844 * are really at the start of tx-window, otherwise the final timer
845 * might expire before he can answer...
848 irlap_start_final_timer(self
, self
->final_timeout
+ transmission_time
);
851 * The clever amongst you might ask why we do this adjustement
852 * only here, and not in all the other cases in irlap_event.c.
853 * In all those other case, we only send a very short management
854 * frame (few bytes), so the adjustement would be lost in the
856 * The exception of course is irlap_resend_rejected_frame().
861 * Function irlap_send_data_secondary_final (self, skb)
863 * Send I(nformation) frame as secondary with final bit set
866 void irlap_send_data_secondary_final(struct irlap_cb
*self
,
869 struct sk_buff
*tx_skb
= NULL
;
871 IRDA_ASSERT(self
!= NULL
, return;);
872 IRDA_ASSERT(self
->magic
== LAP_MAGIC
, return;);
873 IRDA_ASSERT(skb
!= NULL
, return;);
875 /* Is this reliable or unreliable data? */
876 if (skb
->data
[1] == I_FRAME
) {
879 * Insert frame sequence number (Vs) in control field before
880 * inserting into transmit window queue.
882 skb
->data
[1] = I_FRAME
| (self
->vs
<< 1);
885 * Insert frame in store, in case of retransmissions
886 * Increase skb reference count, see irlap_do_event()
889 skb_queue_tail(&self
->wx_list
, skb
);
891 tx_skb
= skb_clone(skb
, GFP_ATOMIC
);
892 if (tx_skb
== NULL
) {
896 tx_skb
->data
[1] |= PF_BIT
;
898 self
->vs
= (self
->vs
+ 1) % 8;
899 self
->ack_required
= FALSE
;
901 irlap_send_i_frame(self
, tx_skb
, RSP_FRAME
);
903 if (self
->ack_required
) {
904 irlap_send_ui_frame(self
, skb_get(skb
), self
->caddr
, RSP_FRAME
);
905 irlap_send_rr_frame(self
, RSP_FRAME
);
906 self
->ack_required
= FALSE
;
908 skb
->data
[1] |= PF_BIT
;
909 irlap_send_ui_frame(self
, skb_get(skb
), self
->caddr
, RSP_FRAME
);
913 self
->window
= self
->window_size
;
914 #ifdef CONFIG_IRDA_DYNAMIC_WINDOW
915 /* We are allowed to transmit a maximum number of bytes again. */
916 self
->bytes_left
= self
->line_capacity
;
917 #endif /* CONFIG_IRDA_DYNAMIC_WINDOW */
919 irlap_start_wd_timer(self
, self
->wd_timeout
);
923 * Function irlap_send_data_secondary (self, skb)
925 * Send I(nformation) frame as secondary without final bit set
928 void irlap_send_data_secondary(struct irlap_cb
*self
, struct sk_buff
*skb
)
930 struct sk_buff
*tx_skb
= NULL
;
932 /* Is this reliable or unreliable data? */
933 if (skb
->data
[1] == I_FRAME
) {
936 * Insert frame sequence number (Vs) in control field before
937 * inserting into transmit window queue.
939 skb
->data
[1] = I_FRAME
| (self
->vs
<< 1);
942 * Insert frame in store, in case of retransmissions
943 * Increase skb reference count, see irlap_do_event()
946 skb_queue_tail(&self
->wx_list
, skb
);
948 tx_skb
= skb_clone(skb
, GFP_ATOMIC
);
949 if (tx_skb
== NULL
) {
953 self
->vs
= (self
->vs
+ 1) % 8;
954 self
->ack_required
= FALSE
;
957 irlap_send_i_frame(self
, tx_skb
, RSP_FRAME
);
959 irlap_send_ui_frame(self
, skb_get(skb
), self
->caddr
, RSP_FRAME
);
965 * Function irlap_resend_rejected_frames (nr)
967 * Resend frames which has not been acknowledged. Should be safe to
968 * traverse the list without locking it since this function will only be
969 * called from interrupt context (BH)
971 void irlap_resend_rejected_frames(struct irlap_cb
*self
, int command
)
973 struct sk_buff
*tx_skb
;
977 IRDA_ASSERT(self
!= NULL
, return;);
978 IRDA_ASSERT(self
->magic
== LAP_MAGIC
, return;);
980 /* Initialize variables */
981 count
= skb_queue_len(&self
->wx_list
);
983 /* Resend unacknowledged frame(s) */
984 skb
= skb_peek(&self
->wx_list
);
985 while (skb
!= NULL
) {
986 irlap_wait_min_turn_around(self
, &self
->qos_tx
);
988 /* We copy the skb to be retransmitted since we will have to
989 * modify it. Cloning will confuse packet sniffers
991 /* tx_skb = skb_clone( skb, GFP_ATOMIC); */
992 tx_skb
= skb_copy(skb
, GFP_ATOMIC
);
994 IRDA_DEBUG(0, "%s(), unable to copy\n", __FUNCTION__
);
998 /* Clear old Nr field + poll bit */
999 tx_skb
->data
[1] &= 0x0f;
1002 * Set poll bit on the last frame retransmitted
1005 tx_skb
->data
[1] |= PF_BIT
; /* Set p/f bit */
1007 tx_skb
->data
[1] &= ~PF_BIT
; /* Clear p/f bit */
1009 irlap_send_i_frame(self
, tx_skb
, command
);
1012 * If our skb is the last buffer in the list, then
1013 * we are finished, if not, move to the next sk-buffer
1015 if (skb
== skb_peek_tail(&self
->wx_list
))
1022 * We can now fill the window with additional data frames
1024 while (!skb_queue_empty(&self
->txq
)) {
1026 IRDA_DEBUG(0, "%s(), sending additional frames!\n", __FUNCTION__
);
1027 if (self
->window
> 0) {
1028 skb
= skb_dequeue( &self
->txq
);
1029 IRDA_ASSERT(skb
!= NULL
, return;);
1032 * If send window > 1 then send frame with pf
1035 if ((self
->window
> 1) &&
1036 !skb_queue_empty(&self
->txq
)) {
1037 irlap_send_data_primary(self
, skb
);
1039 irlap_send_data_primary_poll(self
, skb
);
1047 void irlap_resend_rejected_frame(struct irlap_cb
*self
, int command
)
1049 struct sk_buff
*tx_skb
;
1050 struct sk_buff
*skb
;
1052 IRDA_ASSERT(self
!= NULL
, return;);
1053 IRDA_ASSERT(self
->magic
== LAP_MAGIC
, return;);
1055 /* Resend unacknowledged frame(s) */
1056 skb
= skb_peek(&self
->wx_list
);
1058 irlap_wait_min_turn_around(self
, &self
->qos_tx
);
1060 /* We copy the skb to be retransmitted since we will have to
1061 * modify it. Cloning will confuse packet sniffers
1063 /* tx_skb = skb_clone( skb, GFP_ATOMIC); */
1064 tx_skb
= skb_copy(skb
, GFP_ATOMIC
);
1066 IRDA_DEBUG(0, "%s(), unable to copy\n", __FUNCTION__
);
1070 /* Clear old Nr field + poll bit */
1071 tx_skb
->data
[1] &= 0x0f;
1073 /* Set poll/final bit */
1074 tx_skb
->data
[1] |= PF_BIT
; /* Set p/f bit */
1076 irlap_send_i_frame(self
, tx_skb
, command
);
1081 * Function irlap_send_ui_frame (self, skb, command)
1083 * Contruct and transmit an Unnumbered Information (UI) frame
1086 void irlap_send_ui_frame(struct irlap_cb
*self
, struct sk_buff
*skb
,
1087 __u8 caddr
, int command
)
1089 IRDA_DEBUG(4, "%s()\n", __FUNCTION__
);
1091 IRDA_ASSERT(self
!= NULL
, return;);
1092 IRDA_ASSERT(self
->magic
== LAP_MAGIC
, return;);
1093 IRDA_ASSERT(skb
!= NULL
, return;);
1095 /* Insert connection address */
1096 skb
->data
[0] = caddr
| ((command
) ? CMD_FRAME
: 0);
1098 irlap_queue_xmit(self
, skb
);
1102 * Function irlap_send_i_frame (skb)
1104 * Contruct and transmit Information (I) frame
1106 static void irlap_send_i_frame(struct irlap_cb
*self
, struct sk_buff
*skb
,
1109 /* Insert connection address */
1110 skb
->data
[0] = self
->caddr
;
1111 skb
->data
[0] |= (command
) ? CMD_FRAME
: 0;
1113 /* Insert next to receive (Vr) */
1114 skb
->data
[1] |= (self
->vr
<< 5); /* insert nr */
1116 irlap_queue_xmit(self
, skb
);
1120 * Function irlap_recv_i_frame (skb, frame)
1122 * Receive and parse an I (Information) frame, no harm in making it inline
1123 * since it's called only from one single place (irlap_driver_rcv).
1125 static inline void irlap_recv_i_frame(struct irlap_cb
*self
,
1126 struct sk_buff
*skb
,
1127 struct irlap_info
*info
, int command
)
1129 info
->nr
= skb
->data
[1] >> 5; /* Next to receive */
1130 info
->pf
= skb
->data
[1] & PF_BIT
; /* Final bit */
1131 info
->ns
= (skb
->data
[1] >> 1) & 0x07; /* Next to send */
1133 /* Check if this is a command or a response frame */
1135 irlap_do_event(self
, RECV_I_CMD
, skb
, info
);
1137 irlap_do_event(self
, RECV_I_RSP
, skb
, info
);
1141 * Function irlap_recv_ui_frame (self, skb, info)
1143 * Receive and parse an Unnumbered Information (UI) frame
1146 static void irlap_recv_ui_frame(struct irlap_cb
*self
, struct sk_buff
*skb
,
1147 struct irlap_info
*info
)
1149 IRDA_DEBUG( 4, "%s()\n", __FUNCTION__
);
1151 info
->pf
= skb
->data
[1] & PF_BIT
; /* Final bit */
1153 irlap_do_event(self
, RECV_UI_FRAME
, skb
, info
);
1157 * Function irlap_recv_frmr_frame (skb, frame)
1159 * Received Frame Reject response.
1162 static void irlap_recv_frmr_frame(struct irlap_cb
*self
, struct sk_buff
*skb
,
1163 struct irlap_info
*info
)
1168 IRDA_DEBUG(0, "%s()\n", __FUNCTION__
);
1170 IRDA_ASSERT(self
!= NULL
, return;);
1171 IRDA_ASSERT(self
->magic
== LAP_MAGIC
, return;);
1172 IRDA_ASSERT(skb
!= NULL
, return;);
1173 IRDA_ASSERT(info
!= NULL
, return;);
1175 if (!pskb_may_pull(skb
, 4)) {
1176 IRDA_ERROR("%s: frame too short!\n", __FUNCTION__
);
1182 info
->nr
= frame
[2] >> 5; /* Next to receive */
1183 info
->pf
= frame
[2] & PF_BIT
; /* Final bit */
1184 info
->ns
= (frame
[2] >> 1) & 0x07; /* Next to send */
1186 w
= frame
[3] & 0x01;
1187 x
= frame
[3] & 0x02;
1188 y
= frame
[3] & 0x04;
1189 z
= frame
[3] & 0x08;
1192 IRDA_DEBUG(0, "Rejected control field is undefined or not "
1196 IRDA_DEBUG(0, "Rejected control field was invalid because it "
1197 "contained a non permitted I field.\n");
1200 IRDA_DEBUG(0, "Received I field exceeded the maximum negotiated "
1201 "for the existing connection or exceeded the maximum "
1202 "this station supports if no connection exists.\n");
1205 IRDA_DEBUG(0, "Rejected control field control field contained an "
1206 "invalid Nr count.\n");
1208 irlap_do_event(self
, RECV_FRMR_RSP
, skb
, info
);
1212 * Function irlap_send_test_frame (self, daddr)
1214 * Send a test frame response
1217 void irlap_send_test_frame(struct irlap_cb
*self
, __u8 caddr
, __u32 daddr
,
1218 struct sk_buff
*cmd
)
1220 struct sk_buff
*tx_skb
;
1221 struct test_frame
*frame
;
1224 tx_skb
= alloc_skb(cmd
->len
+ sizeof(struct test_frame
), GFP_ATOMIC
);
1228 /* Broadcast frames must include saddr and daddr fields */
1229 if (caddr
== CBROADCAST
) {
1230 frame
= (struct test_frame
*)
1231 skb_put(tx_skb
, sizeof(struct test_frame
));
1233 /* Insert the swapped addresses */
1234 frame
->saddr
= cpu_to_le32(self
->saddr
);
1235 frame
->daddr
= cpu_to_le32(daddr
);
1237 frame
= (struct test_frame
*) skb_put(tx_skb
, LAP_ADDR_HEADER
+ LAP_CTRL_HEADER
);
1239 frame
->caddr
= caddr
;
1240 frame
->control
= TEST_RSP
| PF_BIT
;
1243 info
= skb_put(tx_skb
, cmd
->len
);
1244 memcpy(info
, cmd
->data
, cmd
->len
);
1246 /* Return to sender */
1247 irlap_wait_min_turn_around(self
, &self
->qos_tx
);
1248 irlap_queue_xmit(self
, tx_skb
);
1252 * Function irlap_recv_test_frame (self, skb)
1254 * Receive a test frame
1257 static void irlap_recv_test_frame(struct irlap_cb
*self
, struct sk_buff
*skb
,
1258 struct irlap_info
*info
, int command
)
1260 struct test_frame
*frame
;
1262 IRDA_DEBUG(2, "%s()\n", __FUNCTION__
);
1264 if (!pskb_may_pull(skb
, sizeof(*frame
))) {
1265 IRDA_ERROR("%s: frame too short!\n", __FUNCTION__
);
1268 frame
= (struct test_frame
*) skb
->data
;
1270 /* Broadcast frames must carry saddr and daddr fields */
1271 if (info
->caddr
== CBROADCAST
) {
1272 if (skb
->len
< sizeof(struct test_frame
)) {
1273 IRDA_DEBUG(0, "%s() test frame too short!\n",
1278 /* Read and swap addresses */
1279 info
->daddr
= le32_to_cpu(frame
->saddr
);
1280 info
->saddr
= le32_to_cpu(frame
->daddr
);
1282 /* Make sure frame is addressed to us */
1283 if ((info
->saddr
!= self
->saddr
) &&
1284 (info
->saddr
!= BROADCAST
)) {
1290 irlap_do_event(self
, RECV_TEST_CMD
, skb
, info
);
1292 irlap_do_event(self
, RECV_TEST_RSP
, skb
, info
);
1296 * Function irlap_driver_rcv (skb, netdev, ptype)
1298 * Called when a frame is received. Dispatches the right receive function
1299 * for processing of the frame.
1301 * Note on skb management :
1302 * After calling the higher layers of the IrDA stack, we always
1303 * kfree() the skb, which drop the reference count (and potentially
1305 * If a higher layer of the stack want to keep the skb around (to put
1306 * in a queue or pass it to the higher layer), it will need to use
1307 * skb_get() to keep a reference on it. This is usually done at the
1308 * LMP level in irlmp.c.
1311 int irlap_driver_rcv(struct sk_buff
*skb
, struct net_device
*dev
,
1312 struct packet_type
*ptype
, struct net_device
*orig_dev
)
1314 struct irlap_info info
;
1315 struct irlap_cb
*self
;
1319 /* FIXME: should we get our own field? */
1320 self
= (struct irlap_cb
*) dev
->atalk_ptr
;
1322 /* If the net device is down, then IrLAP is gone! */
1323 if (!self
|| self
->magic
!= LAP_MAGIC
) {
1328 /* We are no longer an "old" protocol, so we need to handle
1329 * share and non linear skbs. This should never happen, so
1330 * we don't need to be clever about it. Jean II */
1331 if ((skb
= skb_share_check(skb
, GFP_ATOMIC
)) == NULL
) {
1332 IRDA_ERROR("%s: can't clone shared skb!\n", __FUNCTION__
);
1337 /* Check if frame is large enough for parsing */
1338 if (!pskb_may_pull(skb
, 2)) {
1339 IRDA_ERROR("%s: frame too short!\n", __FUNCTION__
);
1344 command
= skb
->data
[0] & CMD_FRAME
;
1345 info
.caddr
= skb
->data
[0] & CBROADCAST
;
1347 info
.pf
= skb
->data
[1] & PF_BIT
;
1348 info
.control
= skb
->data
[1] & ~PF_BIT
; /* Mask away poll/final bit */
1350 control
= info
.control
;
1352 /* First we check if this frame has a valid connection address */
1353 if ((info
.caddr
!= self
->caddr
) && (info
.caddr
!= CBROADCAST
)) {
1354 IRDA_DEBUG(0, "%s(), wrong connection address!\n",
1359 * Optimize for the common case and check if the frame is an
1360 * I(nformation) frame. Only I-frames have bit 0 set to 0
1362 if (~control
& 0x01) {
1363 irlap_recv_i_frame(self
, skb
, &info
, command
);
1367 * We now check is the frame is an S(upervisory) frame. Only
1368 * S-frames have bit 0 set to 1 and bit 1 set to 0
1370 if (~control
& 0x02) {
1372 * Received S(upervisory) frame, check which frame type it is
1373 * only the first nibble is of interest
1375 switch (control
& 0x0f) {
1377 irlap_recv_rr_frame(self
, skb
, &info
, command
);
1380 irlap_recv_rnr_frame(self
, skb
, &info
, command
);
1383 irlap_recv_rej_frame(self
, skb
, &info
, command
);
1386 irlap_recv_srej_frame(self
, skb
, &info
, command
);
1389 IRDA_WARNING("%s: Unknown S-frame %02x received!\n",
1390 __FUNCTION__
, info
.control
);
1396 * This must be a C(ontrol) frame
1400 irlap_recv_discovery_xid_rsp(self
, skb
, &info
);
1403 irlap_recv_discovery_xid_cmd(self
, skb
, &info
);
1406 irlap_recv_snrm_cmd(self
, skb
, &info
);
1409 irlap_do_event(self
, RECV_DM_RSP
, skb
, &info
);
1411 case DISC_CMD
: /* And RD_RSP since they have the same value */
1412 irlap_recv_disc_frame(self
, skb
, &info
, command
);
1415 irlap_recv_test_frame(self
, skb
, &info
, command
);
1418 irlap_recv_ua_frame(self
, skb
, &info
);
1421 irlap_recv_frmr_frame(self
, skb
, &info
);
1424 irlap_recv_ui_frame(self
, skb
, &info
);
1427 IRDA_WARNING("%s: Unknown frame %02x received!\n",
1428 __FUNCTION__
, info
.control
);
1432 /* Always drop our reference on the skb */