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>
32 #include <linux/slab.h>
34 #include <net/pkt_sched.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
,
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
,
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
;
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
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__
,
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
;
126 IRDA_ASSERT(self
!= NULL
, return;);
127 IRDA_ASSERT(self
->magic
== LAP_MAGIC
, return;);
130 tx_skb
= alloc_skb(sizeof(struct snrm_frame
) +
131 IRLAP_NEGOCIATION_PARAMS_LEN
,
136 frame
= (struct snrm_frame
*) skb_put(tx_skb
, 2);
138 /* Insert connection address field */
140 frame
->caddr
= CMD_FRAME
| CBROADCAST
;
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
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
);
159 dev_kfree_skb(tx_skb
);
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",
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",
200 irlap_do_event(self
, RECV_SNRM_CMD
, skb
, info
);
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
;
219 pr_debug("%s() <%ld>\n", __func__
, jiffies
);
221 IRDA_ASSERT(self
!= NULL
, return;);
222 IRDA_ASSERT(self
->magic
== LAP_MAGIC
, return;);
225 tx_skb
= alloc_skb(sizeof(struct ua_frame
) +
226 IRLAP_NEGOCIATION_PARAMS_LEN
,
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? */
242 ret
= irlap_insert_qos_negotiation_params(self
, tx_skb
);
244 dev_kfree_skb(tx_skb
);
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
);
271 frame
= (struct dm_frame
*)skb_put(tx_skb
, 2);
273 if (self
->state
== LAP_NDM
)
274 frame
->caddr
= CBROADCAST
;
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
);
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
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
;
323 pr_debug("%s(), s=%d, S=%d, command=%d\n", __func__
,
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
,
336 frame
= (struct xid_frame
*) tx_skb
->data
;
339 frame
->caddr
= CBROADCAST
| CMD_FRAME
;
340 frame
->control
= XID_CMD
| PF_BIT
;
342 frame
->caddr
= CBROADCAST
;
343 frame
->control
= XID_RSP
| PF_BIT
;
345 frame
->ident
= XID_FORMAT
;
347 frame
->saddr
= cpu_to_le32(self
->saddr
);
350 frame
->daddr
= cpu_to_le32(bcast
);
352 frame
->daddr
= cpu_to_le32(discovery
->data
.daddr
);
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)) {
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];
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
,
409 struct irlap_info
*info
)
411 struct xid_frame
*xid
;
412 discovery_t
*discovery
= NULL
;
413 __u8
*discovery_info
;
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__
);
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",
436 if ((discovery
= kzalloc(sizeof(discovery_t
), GFP_ATOMIC
)) == NULL
) {
437 net_warn_ratelimited("%s: kmalloc failed!\n", __func__
);
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];
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
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
,
483 struct irlap_info
*info
)
485 struct xid_frame
*xid
;
486 discovery_t
*discovery
= NULL
;
487 __u8
*discovery_info
;
490 if (!pskb_may_pull(skb
, sizeof(struct xid_frame
))) {
491 net_err_ratelimited("%s: frame too short!\n", __func__
);
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",
507 switch (xid
->flags
& 0x03) {
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",
541 * We now have some discovery info to deliver!
543 discovery
= kzalloc(sizeof(discovery_t
), GFP_ATOMIC
);
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];
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
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
;
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
);
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
);
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
,
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 */
639 irlap_do_event(self
, RECV_RR_CMD
, skb
, info
);
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
);
658 irlap_do_event(self
, RECV_RNR_CMD
, skb
, info
);
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 */
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 info
->nr
= skb
->data
[1] >> 5;
680 /* Check if this is a command or a response frame */
682 irlap_do_event(self
, RECV_SREJ_CMD
, skb
, info
);
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 */
692 irlap_do_event(self
, RECV_DISC_CMD
, skb
, info
);
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
,
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()
733 skb_queue_tail(&self
->wx_list
, skb
);
736 tx_skb
= skb_clone(skb
, GFP_ATOMIC
);
737 if (tx_skb
== NULL
) {
741 self
->vs
= (self
->vs
+ 1) % 8;
742 self
->ack_required
= FALSE
;
745 irlap_send_i_frame( self
, tx_skb
, CMD_FRAME
);
747 pr_debug("%s(), sending unreliable frame\n", __func__
);
748 irlap_send_ui_frame(self
, skb_get(skb
), self
->caddr
, CMD_FRAME
);
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
;
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()
779 skb_queue_tail(&self
->wx_list
, skb
);
782 tx_skb
= skb_clone(skb
, GFP_ATOMIC
);
783 if (tx_skb
== NULL
) {
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
);
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
;
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...
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
857 * The exception of course is irlap_resend_rejected_frame().
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
,
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()
890 skb_queue_tail(&self
->wx_list
, skb
);
892 tx_skb
= skb_clone(skb
, GFP_ATOMIC
);
893 if (tx_skb
== NULL
) {
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
);
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
;
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()
947 skb_queue_tail(&self
->wx_list
, skb
);
949 tx_skb
= skb_clone(skb
, GFP_ATOMIC
);
950 if (tx_skb
== NULL
) {
954 self
->vs
= (self
->vs
+ 1) % 8;
955 self
->ack_required
= FALSE
;
958 irlap_send_i_frame(self
, tx_skb
, RSP_FRAME
);
960 irlap_send_ui_frame(self
, skb_get(skb
), self
->caddr
, RSP_FRAME
);
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
;
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
);
990 pr_debug("%s(), unable to copy\n", __func__
);
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 */
1003 tx_skb
->data
[1] &= ~PF_BIT
; /* Clear p/f bit */
1005 irlap_send_i_frame(self
, tx_skb
, command
);
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
1022 if ((self
->window
> 1) &&
1023 !skb_queue_empty(&self
->txq
)) {
1024 irlap_send_data_primary(self
, skb
);
1026 irlap_send_data_primary_poll(self
, skb
);
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
);
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
);
1053 pr_debug("%s(), unable to copy\n", __func__
);
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
,
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 */
1120 irlap_do_event(self
, RECV_I_CMD
, skb
, info
);
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
)
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__
);
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;
1173 pr_debug("Rejected control field is undefined or not implemented\n");
1176 pr_debug("Rejected control field was invalid because it contained a non permitted I field\n");
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");
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
;
1200 tx_skb
= alloc_skb(cmd
->len
+ sizeof(struct test_frame
), GFP_ATOMIC
);
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
);
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
;
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__
);
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",
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
)) {
1264 irlap_do_event(self
, RECV_TEST_CMD
, skb
, info
);
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
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.
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
;
1294 if (!net_eq(dev_net(dev
), &init_net
))
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
)
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__
);
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__
);
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",
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
);
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) {
1351 irlap_recv_rr_frame(self
, skb
, &info
, command
);
1354 irlap_recv_rnr_frame(self
, skb
, &info
, command
);
1357 irlap_recv_rej_frame(self
, skb
, &info
, command
);
1360 irlap_recv_srej_frame(self
, skb
, &info
, command
);
1363 net_warn_ratelimited("%s: Unknown S-frame %02x received!\n",
1364 __func__
, info
.control
);
1370 * This must be a C(ontrol) frame
1374 irlap_recv_discovery_xid_rsp(self
, skb
, &info
);
1377 irlap_recv_discovery_xid_cmd(self
, skb
, &info
);
1380 irlap_recv_snrm_cmd(self
, skb
, &info
);
1383 irlap_do_event(self
, RECV_DM_RSP
, skb
, &info
);
1385 case DISC_CMD
: /* And RD_RSP since they have the same value */
1386 irlap_recv_disc_frame(self
, skb
, &info
, command
);
1389 irlap_recv_test_frame(self
, skb
, &info
, command
);
1392 irlap_recv_ua_frame(self
, skb
, &info
);
1395 irlap_recv_frmr_frame(self
, skb
, &info
);
1398 irlap_recv_ui_frame(self
, skb
, &info
);
1401 net_warn_ratelimited("%s: Unknown frame %02x received!\n",
1402 __func__
, info
.control
);
1408 /* Always drop our reference on the skb */