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|
/*********************************************************************
*
* Filename: irlmp_frame.c
* Version: 0.9
* Description: IrLMP frame implementation
* Status: Experimental.
* Author: Dag Brattli <dagb@cs.uit.no>
* Created at: Tue Aug 19 02:09:59 1997
* Modified at: Mon Dec 13 13:41:12 1999
* Modified by: Dag Brattli <dagb@cs.uit.no>
*
* Copyright (c) 1998-1999 Dag Brattli <dagb@cs.uit.no>
* All Rights Reserved.
* Copyright (c) 2000-2003 Jean Tourrilhes <jt@hpl.hp.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* Neither Dag Brattli nor University of Tromsø admit liability nor
* provide warranty for any of this software. This material is
* provided "AS-IS" and at no charge.
*
********************************************************************/
#include <linux/skbuff.h>
#include <linux/kernel.h>
#include <net/irda/irda.h>
#include <net/irda/irlap.h>
#include <net/irda/timer.h>
#include <net/irda/irlmp.h>
#include <net/irda/irlmp_frame.h>
#include <net/irda/discovery.h>
static struct lsap_cb *irlmp_find_lsap(struct lap_cb *self, __u8 dlsap,
__u8 slsap, int status, hashbin_t *);
inline void irlmp_send_data_pdu(struct lap_cb *self, __u8 dlsap, __u8 slsap,
int expedited, struct sk_buff *skb)
{
skb->data[0] = dlsap;
skb->data[1] = slsap;
if (expedited) {
IRDA_DEBUG(4, "%s(), sending expedited data\n", __FUNCTION__);
irlap_data_request(self->irlap, skb, TRUE);
} else
irlap_data_request(self->irlap, skb, FALSE);
}
/*
* Function irlmp_send_lcf_pdu (dlsap, slsap, opcode,skb)
*
* Send Link Control Frame to IrLAP
*/
void irlmp_send_lcf_pdu(struct lap_cb *self, __u8 dlsap, __u8 slsap,
__u8 opcode, struct sk_buff *skb)
{
__u8 *frame;
IRDA_DEBUG(2, "%s()\n", __FUNCTION__);
IRDA_ASSERT(self != NULL, return;);
IRDA_ASSERT(self->magic == LMP_LAP_MAGIC, return;);
IRDA_ASSERT(skb != NULL, return;);
frame = skb->data;
frame[0] = dlsap | CONTROL_BIT;
frame[1] = slsap;
frame[2] = opcode;
if (opcode == DISCONNECT)
frame[3] = 0x01; /* Service user request */
else
frame[3] = 0x00; /* rsvd */
irlap_data_request(self->irlap, skb, FALSE);
}
/*
* Function irlmp_input (skb)
*
* Used by IrLAP to pass received data frames to IrLMP layer
*
*/
void irlmp_link_data_indication(struct lap_cb *self, struct sk_buff *skb,
int unreliable)
{
struct lsap_cb *lsap;
__u8 slsap_sel; /* Source (this) LSAP address */
__u8 dlsap_sel; /* Destination LSAP address */
__u8 *fp;
IRDA_DEBUG(4, "%s()\n", __FUNCTION__);
IRDA_ASSERT(self != NULL, return;);
IRDA_ASSERT(self->magic == LMP_LAP_MAGIC, return;);
IRDA_ASSERT(skb->len > 2, return;);
fp = skb->data;
/*
* The next statements may be confusing, but we do this so that
* destination LSAP of received frame is source LSAP in our view
*/
slsap_sel = fp[0] & LSAP_MASK;
dlsap_sel = fp[1];
/*
* Check if this is an incoming connection, since we must deal with
* it in a different way than other established connections.
*/
if ((fp[0] & CONTROL_BIT) && (fp[2] == CONNECT_CMD)) {
IRDA_DEBUG(3, "%s(), incoming connection, "
"source LSAP=%d, dest LSAP=%d\n",
__FUNCTION__, slsap_sel, dlsap_sel);
/* Try to find LSAP among the unconnected LSAPs */
lsap = irlmp_find_lsap(self, dlsap_sel, slsap_sel, CONNECT_CMD,
irlmp->unconnected_lsaps);
/* Maybe LSAP was already connected, so try one more time */
if (!lsap) {
IRDA_DEBUG(1, "%s(), incoming connection for LSAP already connected\n", __FUNCTION__);
lsap = irlmp_find_lsap(self, dlsap_sel, slsap_sel, 0,
self->lsaps);
}
} else
lsap = irlmp_find_lsap(self, dlsap_sel, slsap_sel, 0,
self->lsaps);
if (lsap == NULL) {
IRDA_DEBUG(2, "IrLMP, Sorry, no LSAP for received frame!\n");
IRDA_DEBUG(2, "%s(), slsap_sel = %02x, dlsap_sel = %02x\n",
__FUNCTION__, slsap_sel, dlsap_sel);
if (fp[0] & CONTROL_BIT) {
IRDA_DEBUG(2, "%s(), received control frame %02x\n",
__FUNCTION__, fp[2]);
} else {
IRDA_DEBUG(2, "%s(), received data frame\n", __FUNCTION__);
}
return;
}
/*
* Check if we received a control frame?
*/
if (fp[0] & CONTROL_BIT) {
switch (fp[2]) {
case CONNECT_CMD:
lsap->lap = self;
irlmp_do_lsap_event(lsap, LM_CONNECT_INDICATION, skb);
break;
case CONNECT_CNF:
irlmp_do_lsap_event(lsap, LM_CONNECT_CONFIRM, skb);
break;
case DISCONNECT:
IRDA_DEBUG(4, "%s(), Disconnect indication!\n",
__FUNCTION__);
irlmp_do_lsap_event(lsap, LM_DISCONNECT_INDICATION,
skb);
break;
case ACCESSMODE_CMD:
IRDA_DEBUG(0, "Access mode cmd not implemented!\n");
break;
case ACCESSMODE_CNF:
IRDA_DEBUG(0, "Access mode cnf not implemented!\n");
break;
default:
IRDA_DEBUG(0, "%s(), Unknown control frame %02x\n",
__FUNCTION__, fp[2]);
break;
}
} else if (unreliable) {
/* Optimize and bypass the state machine if possible */
if (lsap->lsap_state == LSAP_DATA_TRANSFER_READY)
irlmp_udata_indication(lsap, skb);
else
irlmp_do_lsap_event(lsap, LM_UDATA_INDICATION, skb);
} else {
/* Optimize and bypass the state machine if possible */
if (lsap->lsap_state == LSAP_DATA_TRANSFER_READY)
irlmp_data_indication(lsap, skb);
else
irlmp_do_lsap_event(lsap, LM_DATA_INDICATION, skb);
}
}
/*
* Function irlmp_link_unitdata_indication (self, skb)
*
*
*
*/
#ifdef CONFIG_IRDA_ULTRA
void irlmp_link_unitdata_indication(struct lap_cb *self, struct sk_buff *skb)
{
struct lsap_cb *lsap;
__u8 slsap_sel; /* Source (this) LSAP address */
__u8 dlsap_sel; /* Destination LSAP address */
__u8 pid; /* Protocol identifier */
__u8 *fp;
unsigned long flags;
IRDA_DEBUG(4, "%s()\n", __FUNCTION__);
IRDA_ASSERT(self != NULL, return;);
IRDA_ASSERT(self->magic == LMP_LAP_MAGIC, return;);
IRDA_ASSERT(skb->len > 2, return;);
fp = skb->data;
/*
* The next statements may be confusing, but we do this so that
* destination LSAP of received frame is source LSAP in our view
*/
slsap_sel = fp[0] & LSAP_MASK;
dlsap_sel = fp[1];
pid = fp[2];
if (pid & 0x80) {
IRDA_DEBUG(0, "%s(), extension in PID not supp!\n",
__FUNCTION__);
return;
}
/* Check if frame is addressed to the connectionless LSAP */
if ((slsap_sel != LSAP_CONNLESS) || (dlsap_sel != LSAP_CONNLESS)) {
IRDA_DEBUG(0, "%s(), dropping frame!\n", __FUNCTION__);
return;
}
/* Search the connectionless LSAP */
spin_lock_irqsave(&irlmp->unconnected_lsaps->hb_spinlock, flags);
lsap = (struct lsap_cb *) hashbin_get_first(irlmp->unconnected_lsaps);
while (lsap != NULL) {
/*
* Check if source LSAP and dest LSAP selectors and PID match.
*/
if ((lsap->slsap_sel == slsap_sel) &&
(lsap->dlsap_sel == dlsap_sel) &&
(lsap->pid == pid))
{
break;
}
lsap = (struct lsap_cb *) hashbin_get_next(irlmp->unconnected_lsaps);
}
|