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
= 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
= 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
= 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
= 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 skb_put_data(tx_skb
, discovery
->data
.info
, len
);
397 irlap_queue_xmit(self
, tx_skb
);
401 * Function irlap_recv_discovery_xid_rsp (skb, info)
403 * Received a XID discovery response
406 static void irlap_recv_discovery_xid_rsp(struct irlap_cb
*self
,
408 struct irlap_info
*info
)
410 struct xid_frame
*xid
;
411 discovery_t
*discovery
= NULL
;
412 __u8
*discovery_info
;
415 IRDA_ASSERT(self
!= NULL
, return;);
416 IRDA_ASSERT(self
->magic
== LAP_MAGIC
, return;);
418 if (!pskb_may_pull(skb
, sizeof(struct xid_frame
))) {
419 net_err_ratelimited("%s: frame too short!\n", __func__
);
423 xid
= (struct xid_frame
*) skb
->data
;
425 info
->daddr
= le32_to_cpu(xid
->saddr
);
426 info
->saddr
= le32_to_cpu(xid
->daddr
);
428 /* Make sure frame is addressed to us */
429 if ((info
->saddr
!= self
->saddr
) && (info
->saddr
!= BROADCAST
)) {
430 pr_debug("%s(), frame is not addressed to us!\n",
435 if ((discovery
= kzalloc(sizeof(discovery_t
), GFP_ATOMIC
)) == NULL
) {
436 net_warn_ratelimited("%s: kmalloc failed!\n", __func__
);
440 discovery
->data
.daddr
= info
->daddr
;
441 discovery
->data
.saddr
= self
->saddr
;
442 discovery
->timestamp
= jiffies
;
444 pr_debug("%s(), daddr=%08x\n", __func__
,
445 discovery
->data
.daddr
);
447 discovery_info
= skb_pull(skb
, sizeof(struct xid_frame
));
449 /* Get info returned from peer */
450 discovery
->data
.hints
[0] = discovery_info
[0];
451 if (discovery_info
[0] & HINT_EXTENSION
) {
452 pr_debug("EXTENSION\n");
453 discovery
->data
.hints
[1] = discovery_info
[1];
454 discovery
->data
.charset
= discovery_info
[2];
455 text
= (char *) &discovery_info
[3];
457 discovery
->data
.hints
[1] = 0;
458 discovery
->data
.charset
= discovery_info
[1];
459 text
= (char *) &discovery_info
[2];
462 * Terminate info string, should be safe since this is where the
465 skb
->data
[skb
->len
] = '\0';
466 strncpy(discovery
->data
.info
, text
, NICKNAME_MAX_LEN
);
467 discovery
->name_len
= strlen(discovery
->data
.info
);
469 info
->discovery
= discovery
;
471 irlap_do_event(self
, RECV_DISCOVERY_XID_RSP
, skb
, info
);
475 * Function irlap_recv_discovery_xid_cmd (skb, info)
477 * Received a XID discovery command
480 static void irlap_recv_discovery_xid_cmd(struct irlap_cb
*self
,
482 struct irlap_info
*info
)
484 struct xid_frame
*xid
;
485 discovery_t
*discovery
= NULL
;
486 __u8
*discovery_info
;
489 if (!pskb_may_pull(skb
, sizeof(struct xid_frame
))) {
490 net_err_ratelimited("%s: frame too short!\n", __func__
);
494 xid
= (struct xid_frame
*) skb
->data
;
496 info
->daddr
= le32_to_cpu(xid
->saddr
);
497 info
->saddr
= le32_to_cpu(xid
->daddr
);
499 /* Make sure frame is addressed to us */
500 if ((info
->saddr
!= self
->saddr
) && (info
->saddr
!= BROADCAST
)) {
501 pr_debug("%s(), frame is not addressed to us!\n",
506 switch (xid
->flags
& 0x03) {
523 info
->s
= xid
->slotnr
;
525 discovery_info
= skb_pull(skb
, sizeof(struct xid_frame
));
528 * Check if last frame
530 if (info
->s
== 0xff) {
531 /* Check if things are sane at this point... */
532 if((discovery_info
== NULL
) ||
533 !pskb_may_pull(skb
, 3)) {
534 net_err_ratelimited("%s: discovery frame too short!\n",
540 * We now have some discovery info to deliver!
542 discovery
= kzalloc(sizeof(discovery_t
), GFP_ATOMIC
);
546 discovery
->data
.daddr
= info
->daddr
;
547 discovery
->data
.saddr
= self
->saddr
;
548 discovery
->timestamp
= jiffies
;
550 discovery
->data
.hints
[0] = discovery_info
[0];
551 if (discovery_info
[0] & HINT_EXTENSION
) {
552 discovery
->data
.hints
[1] = discovery_info
[1];
553 discovery
->data
.charset
= discovery_info
[2];
554 text
= (char *) &discovery_info
[3];
556 discovery
->data
.hints
[1] = 0;
557 discovery
->data
.charset
= discovery_info
[1];
558 text
= (char *) &discovery_info
[2];
561 * Terminate string, should be safe since this is where the
564 skb
->data
[skb
->len
] = '\0';
565 strncpy(discovery
->data
.info
, text
, NICKNAME_MAX_LEN
);
566 discovery
->name_len
= strlen(discovery
->data
.info
);
568 info
->discovery
= discovery
;
570 info
->discovery
= NULL
;
572 irlap_do_event(self
, RECV_DISCOVERY_XID_CMD
, skb
, info
);
576 * Function irlap_send_rr_frame (self, command)
578 * Build and transmit RR (Receive Ready) frame. Notice that it is currently
579 * only possible to send RR frames with the poll bit set.
581 void irlap_send_rr_frame(struct irlap_cb
*self
, int command
)
583 struct sk_buff
*tx_skb
;
584 struct rr_frame
*frame
;
586 tx_skb
= alloc_skb(sizeof(struct rr_frame
), GFP_ATOMIC
);
590 frame
= skb_put(tx_skb
, 2);
592 frame
->caddr
= self
->caddr
;
593 frame
->caddr
|= (command
) ? CMD_FRAME
: 0;
595 frame
->control
= RR
| PF_BIT
| (self
->vr
<< 5);
597 irlap_queue_xmit(self
, tx_skb
);
601 * Function irlap_send_rd_frame (self)
603 * Request disconnect. Used by a secondary station to request the
604 * disconnection of the link.
606 void irlap_send_rd_frame(struct irlap_cb
*self
)
608 struct sk_buff
*tx_skb
;
609 struct rd_frame
*frame
;
611 tx_skb
= alloc_skb(sizeof(struct rd_frame
), GFP_ATOMIC
);
615 frame
= skb_put(tx_skb
, 2);
617 frame
->caddr
= self
->caddr
;
618 frame
->control
= RD_RSP
| PF_BIT
;
620 irlap_queue_xmit(self
, tx_skb
);
624 * Function irlap_recv_rr_frame (skb, info)
626 * Received RR (Receive Ready) frame from peer station, no harm in
627 * making it inline since its called only from one single place
628 * (irlap_driver_rcv).
630 static inline void irlap_recv_rr_frame(struct irlap_cb
*self
,
632 struct irlap_info
*info
, int command
)
634 info
->nr
= skb
->data
[1] >> 5;
636 /* Check if this is a command or a response frame */
638 irlap_do_event(self
, RECV_RR_CMD
, skb
, info
);
640 irlap_do_event(self
, RECV_RR_RSP
, skb
, info
);
644 * Function irlap_recv_rnr_frame (self, skb, info)
646 * Received RNR (Receive Not Ready) frame from peer station
649 static void irlap_recv_rnr_frame(struct irlap_cb
*self
, struct sk_buff
*skb
,
650 struct irlap_info
*info
, int command
)
652 info
->nr
= skb
->data
[1] >> 5;
654 pr_debug("%s(), nr=%d, %ld\n", __func__
, info
->nr
, jiffies
);
657 irlap_do_event(self
, RECV_RNR_CMD
, skb
, info
);
659 irlap_do_event(self
, RECV_RNR_RSP
, skb
, info
);
662 static void irlap_recv_rej_frame(struct irlap_cb
*self
, struct sk_buff
*skb
,
663 struct irlap_info
*info
, int command
)
665 info
->nr
= skb
->data
[1] >> 5;
667 /* Check if this is a command or a response frame */
669 irlap_do_event(self
, RECV_REJ_CMD
, skb
, info
);
671 irlap_do_event(self
, RECV_REJ_RSP
, skb
, info
);
674 static void irlap_recv_srej_frame(struct irlap_cb
*self
, struct sk_buff
*skb
,
675 struct irlap_info
*info
, int command
)
677 info
->nr
= skb
->data
[1] >> 5;
679 /* Check if this is a command or a response frame */
681 irlap_do_event(self
, RECV_SREJ_CMD
, skb
, info
);
683 irlap_do_event(self
, RECV_SREJ_RSP
, skb
, info
);
686 static void irlap_recv_disc_frame(struct irlap_cb
*self
, struct sk_buff
*skb
,
687 struct irlap_info
*info
, int command
)
689 /* Check if this is a command or a response frame */
691 irlap_do_event(self
, RECV_DISC_CMD
, skb
, info
);
693 irlap_do_event(self
, RECV_RD_RSP
, skb
, info
);
697 * Function irlap_recv_ua_frame (skb, frame)
699 * Received UA (Unnumbered Acknowledgement) frame
702 static inline void irlap_recv_ua_frame(struct irlap_cb
*self
,
704 struct irlap_info
*info
)
706 irlap_do_event(self
, RECV_UA_RSP
, skb
, info
);
710 * Function irlap_send_data_primary(self, skb)
712 * Send I-frames as the primary station but without the poll bit set
715 void irlap_send_data_primary(struct irlap_cb
*self
, struct sk_buff
*skb
)
717 struct sk_buff
*tx_skb
;
719 if (skb
->data
[1] == I_FRAME
) {
722 * Insert frame sequence number (Vs) in control field before
723 * inserting into transmit window queue.
725 skb
->data
[1] = I_FRAME
| (self
->vs
<< 1);
728 * Insert frame in store, in case of retransmissions
729 * Increase skb reference count, see irlap_do_event()
732 skb_queue_tail(&self
->wx_list
, skb
);
735 tx_skb
= skb_clone(skb
, GFP_ATOMIC
);
736 if (tx_skb
== NULL
) {
740 self
->vs
= (self
->vs
+ 1) % 8;
741 self
->ack_required
= FALSE
;
744 irlap_send_i_frame( self
, tx_skb
, CMD_FRAME
);
746 pr_debug("%s(), sending unreliable frame\n", __func__
);
747 irlap_send_ui_frame(self
, skb_get(skb
), self
->caddr
, CMD_FRAME
);
752 * Function irlap_send_data_primary_poll (self, skb)
754 * Send I(nformation) frame as primary with poll bit set
756 void irlap_send_data_primary_poll(struct irlap_cb
*self
, struct sk_buff
*skb
)
758 struct sk_buff
*tx_skb
;
759 int transmission_time
;
762 del_timer(&self
->poll_timer
);
764 /* Is this reliable or unreliable data? */
765 if (skb
->data
[1] == I_FRAME
) {
768 * Insert frame sequence number (Vs) in control field before
769 * inserting into transmit window queue.
771 skb
->data
[1] = I_FRAME
| (self
->vs
<< 1);
774 * Insert frame in store, in case of retransmissions
775 * Increase skb reference count, see irlap_do_event()
778 skb_queue_tail(&self
->wx_list
, skb
);
781 tx_skb
= skb_clone(skb
, GFP_ATOMIC
);
782 if (tx_skb
== NULL
) {
787 * Set poll bit if necessary. We do this to the copied
788 * skb, since retransmitted need to set or clear the poll
789 * bit depending on when they are sent.
791 tx_skb
->data
[1] |= PF_BIT
;
793 self
->vs
= (self
->vs
+ 1) % 8;
794 self
->ack_required
= FALSE
;
796 irlap_next_state(self
, LAP_NRM_P
);
797 irlap_send_i_frame(self
, tx_skb
, CMD_FRAME
);
799 pr_debug("%s(), sending unreliable frame\n", __func__
);
801 if (self
->ack_required
) {
802 irlap_send_ui_frame(self
, skb_get(skb
), self
->caddr
, CMD_FRAME
);
803 irlap_next_state(self
, LAP_NRM_P
);
804 irlap_send_rr_frame(self
, CMD_FRAME
);
805 self
->ack_required
= FALSE
;
807 skb
->data
[1] |= PF_BIT
;
808 irlap_next_state(self
, LAP_NRM_P
);
809 irlap_send_ui_frame(self
, skb_get(skb
), self
->caddr
, CMD_FRAME
);
813 /* How much time we took for transmission of all frames.
814 * We don't know, so let assume we used the full window. Jean II */
815 transmission_time
= self
->final_timeout
;
817 /* Reset parameter so that we can fill next window */
818 self
->window
= self
->window_size
;
820 #ifdef CONFIG_IRDA_DYNAMIC_WINDOW
821 /* Remove what we have not used. Just do a prorata of the
822 * bytes left in window to window capacity.
823 * See max_line_capacities[][] in qos.c for details. Jean II */
824 transmission_time
-= (self
->final_timeout
* self
->bytes_left
825 / self
->line_capacity
);
826 pr_debug("%s() adjusting transmission_time : ft=%d, bl=%d, lc=%d -> tt=%d\n",
827 __func__
, self
->final_timeout
, self
->bytes_left
,
828 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 beginning 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
;
976 IRDA_ASSERT(self
!= NULL
, return;);
977 IRDA_ASSERT(self
->magic
== LAP_MAGIC
, return;);
979 /* Resend unacknowledged frame(s) */
980 skb_queue_walk(&self
->wx_list
, skb
) {
981 irlap_wait_min_turn_around(self
, &self
->qos_tx
);
983 /* We copy the skb to be retransmitted since we will have to
984 * modify it. Cloning will confuse packet sniffers
986 /* tx_skb = skb_clone( skb, GFP_ATOMIC); */
987 tx_skb
= skb_copy(skb
, GFP_ATOMIC
);
989 pr_debug("%s(), unable to copy\n", __func__
);
993 /* Clear old Nr field + poll bit */
994 tx_skb
->data
[1] &= 0x0f;
997 * Set poll bit on the last frame retransmitted
999 if (skb_queue_is_last(&self
->wx_list
, skb
))
1000 tx_skb
->data
[1] |= PF_BIT
; /* Set p/f bit */
1002 tx_skb
->data
[1] &= ~PF_BIT
; /* Clear p/f bit */
1004 irlap_send_i_frame(self
, tx_skb
, command
);
1008 * We can now fill the window with additional data frames
1010 while (!skb_queue_empty(&self
->txq
)) {
1012 pr_debug("%s(), sending additional frames!\n", __func__
);
1013 if (self
->window
> 0) {
1014 skb
= skb_dequeue( &self
->txq
);
1015 IRDA_ASSERT(skb
!= NULL
, return;);
1018 * If send window > 1 then send frame with pf
1021 if ((self
->window
> 1) &&
1022 !skb_queue_empty(&self
->txq
)) {
1023 irlap_send_data_primary(self
, skb
);
1025 irlap_send_data_primary_poll(self
, skb
);
1033 void irlap_resend_rejected_frame(struct irlap_cb
*self
, int command
)
1035 struct sk_buff
*tx_skb
;
1036 struct sk_buff
*skb
;
1038 IRDA_ASSERT(self
!= NULL
, return;);
1039 IRDA_ASSERT(self
->magic
== LAP_MAGIC
, return;);
1041 /* Resend unacknowledged frame(s) */
1042 skb
= skb_peek(&self
->wx_list
);
1044 irlap_wait_min_turn_around(self
, &self
->qos_tx
);
1046 /* We copy the skb to be retransmitted since we will have to
1047 * modify it. Cloning will confuse packet sniffers
1049 /* tx_skb = skb_clone( skb, GFP_ATOMIC); */
1050 tx_skb
= skb_copy(skb
, GFP_ATOMIC
);
1052 pr_debug("%s(), unable to copy\n", __func__
);
1056 /* Clear old Nr field + poll bit */
1057 tx_skb
->data
[1] &= 0x0f;
1059 /* Set poll/final bit */
1060 tx_skb
->data
[1] |= PF_BIT
; /* Set p/f bit */
1062 irlap_send_i_frame(self
, tx_skb
, command
);
1067 * Function irlap_send_ui_frame (self, skb, command)
1069 * Contruct and transmit an Unnumbered Information (UI) frame
1072 void irlap_send_ui_frame(struct irlap_cb
*self
, struct sk_buff
*skb
,
1073 __u8 caddr
, int command
)
1075 IRDA_ASSERT(self
!= NULL
, return;);
1076 IRDA_ASSERT(self
->magic
== LAP_MAGIC
, return;);
1077 IRDA_ASSERT(skb
!= NULL
, return;);
1079 /* Insert connection address */
1080 skb
->data
[0] = caddr
| ((command
) ? CMD_FRAME
: 0);
1082 irlap_queue_xmit(self
, skb
);
1086 * Function irlap_send_i_frame (skb)
1088 * Contruct and transmit Information (I) frame
1090 static void irlap_send_i_frame(struct irlap_cb
*self
, struct sk_buff
*skb
,
1093 /* Insert connection address */
1094 skb
->data
[0] = self
->caddr
;
1095 skb
->data
[0] |= (command
) ? CMD_FRAME
: 0;
1097 /* Insert next to receive (Vr) */
1098 skb
->data
[1] |= (self
->vr
<< 5); /* insert nr */
1100 irlap_queue_xmit(self
, skb
);
1104 * Function irlap_recv_i_frame (skb, frame)
1106 * Receive and parse an I (Information) frame, no harm in making it inline
1107 * since it's called only from one single place (irlap_driver_rcv).
1109 static inline void irlap_recv_i_frame(struct irlap_cb
*self
,
1110 struct sk_buff
*skb
,
1111 struct irlap_info
*info
, int command
)
1113 info
->nr
= skb
->data
[1] >> 5; /* Next to receive */
1114 info
->pf
= skb
->data
[1] & PF_BIT
; /* Final bit */
1115 info
->ns
= (skb
->data
[1] >> 1) & 0x07; /* Next to send */
1117 /* Check if this is a command or a response frame */
1119 irlap_do_event(self
, RECV_I_CMD
, skb
, info
);
1121 irlap_do_event(self
, RECV_I_RSP
, skb
, info
);
1125 * Function irlap_recv_ui_frame (self, skb, info)
1127 * Receive and parse an Unnumbered Information (UI) frame
1130 static void irlap_recv_ui_frame(struct irlap_cb
*self
, struct sk_buff
*skb
,
1131 struct irlap_info
*info
)
1133 info
->pf
= skb
->data
[1] & PF_BIT
; /* Final bit */
1135 irlap_do_event(self
, RECV_UI_FRAME
, skb
, info
);
1139 * Function irlap_recv_frmr_frame (skb, frame)
1141 * Received Frame Reject response.
1144 static void irlap_recv_frmr_frame(struct irlap_cb
*self
, struct sk_buff
*skb
,
1145 struct irlap_info
*info
)
1150 IRDA_ASSERT(self
!= NULL
, return;);
1151 IRDA_ASSERT(self
->magic
== LAP_MAGIC
, return;);
1152 IRDA_ASSERT(skb
!= NULL
, return;);
1153 IRDA_ASSERT(info
!= NULL
, return;);
1155 if (!pskb_may_pull(skb
, 4)) {
1156 net_err_ratelimited("%s: frame too short!\n", __func__
);
1162 info
->nr
= frame
[2] >> 5; /* Next to receive */
1163 info
->pf
= frame
[2] & PF_BIT
; /* Final bit */
1164 info
->ns
= (frame
[2] >> 1) & 0x07; /* Next to send */
1166 w
= frame
[3] & 0x01;
1167 x
= frame
[3] & 0x02;
1168 y
= frame
[3] & 0x04;
1169 z
= frame
[3] & 0x08;
1172 pr_debug("Rejected control field is undefined or not implemented\n");
1175 pr_debug("Rejected control field was invalid because it contained a non permitted I field\n");
1178 pr_debug("Received I field exceeded the maximum negotiated for the existing connection or exceeded the maximum this station supports if no connection exists\n");
1181 pr_debug("Rejected control field control field contained an invalid Nr count\n");
1183 irlap_do_event(self
, RECV_FRMR_RSP
, skb
, info
);
1187 * Function irlap_send_test_frame (self, daddr)
1189 * Send a test frame response
1192 void irlap_send_test_frame(struct irlap_cb
*self
, __u8 caddr
, __u32 daddr
,
1193 struct sk_buff
*cmd
)
1195 struct sk_buff
*tx_skb
;
1196 struct test_frame
*frame
;
1198 tx_skb
= alloc_skb(cmd
->len
+ sizeof(struct test_frame
), GFP_ATOMIC
);
1202 /* Broadcast frames must include saddr and daddr fields */
1203 if (caddr
== CBROADCAST
) {
1204 frame
= skb_put(tx_skb
, sizeof(struct test_frame
));
1206 /* Insert the swapped addresses */
1207 frame
->saddr
= cpu_to_le32(self
->saddr
);
1208 frame
->daddr
= cpu_to_le32(daddr
);
1210 frame
= skb_put(tx_skb
, LAP_ADDR_HEADER
+ LAP_CTRL_HEADER
);
1212 frame
->caddr
= caddr
;
1213 frame
->control
= TEST_RSP
| PF_BIT
;
1216 skb_put_data(tx_skb
, cmd
->data
, cmd
->len
);
1218 /* Return to sender */
1219 irlap_wait_min_turn_around(self
, &self
->qos_tx
);
1220 irlap_queue_xmit(self
, tx_skb
);
1224 * Function irlap_recv_test_frame (self, skb)
1226 * Receive a test frame
1229 static void irlap_recv_test_frame(struct irlap_cb
*self
, struct sk_buff
*skb
,
1230 struct irlap_info
*info
, int command
)
1232 struct test_frame
*frame
;
1234 if (!pskb_may_pull(skb
, sizeof(*frame
))) {
1235 net_err_ratelimited("%s: frame too short!\n", __func__
);
1238 frame
= (struct test_frame
*) skb
->data
;
1240 /* Broadcast frames must carry saddr and daddr fields */
1241 if (info
->caddr
== CBROADCAST
) {
1242 if (skb
->len
< sizeof(struct test_frame
)) {
1243 pr_debug("%s() test frame too short!\n",
1248 /* Read and swap addresses */
1249 info
->daddr
= le32_to_cpu(frame
->saddr
);
1250 info
->saddr
= le32_to_cpu(frame
->daddr
);
1252 /* Make sure frame is addressed to us */
1253 if ((info
->saddr
!= self
->saddr
) &&
1254 (info
->saddr
!= BROADCAST
)) {
1260 irlap_do_event(self
, RECV_TEST_CMD
, skb
, info
);
1262 irlap_do_event(self
, RECV_TEST_RSP
, skb
, info
);
1266 * Function irlap_driver_rcv (skb, netdev, ptype)
1268 * Called when a frame is received. Dispatches the right receive function
1269 * for processing of the frame.
1271 * Note on skb management :
1272 * After calling the higher layers of the IrDA stack, we always
1273 * kfree() the skb, which drop the reference count (and potentially
1275 * If a higher layer of the stack want to keep the skb around (to put
1276 * in a queue or pass it to the higher layer), it will need to use
1277 * skb_get() to keep a reference on it. This is usually done at the
1278 * LMP level in irlmp.c.
1281 int irlap_driver_rcv(struct sk_buff
*skb
, struct net_device
*dev
,
1282 struct packet_type
*ptype
, struct net_device
*orig_dev
)
1284 struct irlap_info info
;
1285 struct irlap_cb
*self
;
1290 if (!net_eq(dev_net(dev
), &init_net
))
1293 /* FIXME: should we get our own field? */
1294 self
= (struct irlap_cb
*) dev
->atalk_ptr
;
1296 /* If the net device is down, then IrLAP is gone! */
1297 if (!self
|| self
->magic
!= LAP_MAGIC
)
1300 /* We are no longer an "old" protocol, so we need to handle
1301 * share and non linear skbs. This should never happen, so
1302 * we don't need to be clever about it. Jean II */
1303 if ((skb
= skb_share_check(skb
, GFP_ATOMIC
)) == NULL
) {
1304 net_err_ratelimited("%s: can't clone shared skb!\n", __func__
);
1308 /* Check if frame is large enough for parsing */
1309 if (!pskb_may_pull(skb
, 2)) {
1310 net_err_ratelimited("%s: frame too short!\n", __func__
);
1314 command
= skb
->data
[0] & CMD_FRAME
;
1315 info
.caddr
= skb
->data
[0] & CBROADCAST
;
1317 info
.pf
= skb
->data
[1] & PF_BIT
;
1318 info
.control
= skb
->data
[1] & ~PF_BIT
; /* Mask away poll/final bit */
1320 control
= info
.control
;
1322 /* First we check if this frame has a valid connection address */
1323 if ((info
.caddr
!= self
->caddr
) && (info
.caddr
!= CBROADCAST
)) {
1324 pr_debug("%s(), wrong connection address!\n",
1329 * Optimize for the common case and check if the frame is an
1330 * I(nformation) frame. Only I-frames have bit 0 set to 0
1332 if (~control
& 0x01) {
1333 irlap_recv_i_frame(self
, skb
, &info
, command
);
1337 * We now check is the frame is an S(upervisory) frame. Only
1338 * S-frames have bit 0 set to 1 and bit 1 set to 0
1340 if (~control
& 0x02) {
1342 * Received S(upervisory) frame, check which frame type it is
1343 * only the first nibble is of interest
1345 switch (control
& 0x0f) {
1347 irlap_recv_rr_frame(self
, skb
, &info
, command
);
1350 irlap_recv_rnr_frame(self
, skb
, &info
, command
);
1353 irlap_recv_rej_frame(self
, skb
, &info
, command
);
1356 irlap_recv_srej_frame(self
, skb
, &info
, command
);
1359 net_warn_ratelimited("%s: Unknown S-frame %02x received!\n",
1360 __func__
, info
.control
);
1366 * This must be a C(ontrol) frame
1370 irlap_recv_discovery_xid_rsp(self
, skb
, &info
);
1373 irlap_recv_discovery_xid_cmd(self
, skb
, &info
);
1376 irlap_recv_snrm_cmd(self
, skb
, &info
);
1379 irlap_do_event(self
, RECV_DM_RSP
, skb
, &info
);
1381 case DISC_CMD
: /* And RD_RSP since they have the same value */
1382 irlap_recv_disc_frame(self
, skb
, &info
, command
);
1385 irlap_recv_test_frame(self
, skb
, &info
, command
);
1388 irlap_recv_ua_frame(self
, skb
, &info
);
1391 irlap_recv_frmr_frame(self
, skb
, &info
);
1394 irlap_recv_ui_frame(self
, skb
, &info
);
1397 net_warn_ratelimited("%s: Unknown frame %02x received!\n",
1398 __func__
, info
.control
);
1404 /* Always drop our reference on the skb */