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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright (c) 1999-2000 by Sun Microsystems, Inc.
* All rights reserved.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
/*
* file: agentID.c
*
* This files contains all of the routines necessary to
* manage the Mobile-IP Replay protection mechanisms.
*/
#include "mip.h"
#include "agent.h"
/*
* IDfreshnessSlack contains the number of seconds that
* we allow as a difference between our clock and the
* mobile node's clock when timestamp-based replay
* protection is used.
*/
extern int IDfreshnessSlack;
extern uint32_t getRandomValue();
extern uint32_t CurrentTimeNTPSec();
/*
* Function: HAinitID
*
* Arguments: IDHigh - High order 32 bit ID
* IDLow - Low order 32 bit ID
* ReplayStyle - Replay type.
*
* Description: This function is called by the Home Agent
* to initialize a Mobile Node's replay
* identifier.
*
* Returns:
*/
void
HAinitID(uint32_t *IDHigh, uint32_t *IDLow, int ReplayStyle)
{
if (ReplayStyle == TIMESTAMPS) {
*IDHigh = CurrentTimeNTPSec() - IDfreshnessSlack;
*IDLow = getRandomValue();
} else {
*IDHigh = 0;
*IDLow = 0;
}
}
/*
* Function: isIDgreater
*
* Arguments: StoredIDHigh - Locally stored high order 32 bit replay ID
* StoredIDLow - Locally stored low order 32 bit replay ID
* IDHigh - High order 32 bit replay ID
* IDLow - Low order 32 bit replay ID
*
* Description: This function will return TRUE if the ID received
* by the Mobile Node is higher than the value stored
* locally.
*
* Returns: boolean_t, TRUE if value is greater than stored value.
*/
static boolean_t
isIDgreater(uint32_t StoredIDHigh, uint32_t StoredIDLow,
uint32_t IDHigh, uint32_t IDLow)
{
if ((IDHigh > StoredIDHigh) ||
((IDHigh == StoredIDHigh) && (IDLow > StoredIDLow)))
return (_B_TRUE);
else
return (_B_FALSE);
}
/*
* Function: isIDfresh
*
* Arguments: IDHigh - High order 32 bit replay ID
* IDLow - Low order 32 bit replay ID
*
* Description: This value will compare the ID received
* with the local NTP time. Specifically, we
* will check if the time sent by the Mobile Node
* is within the current time +/- our configured
* clock skew.
*
* Returns: boolean_t, TRUE if the time is within our window.
*/
/* ARGSUSED */
static boolean_t
isIDfresh(uint32_t IDHigh, uint32_t IDLow)
{
long diff;
diff = (long)(IDHigh - CurrentTimeNTPSec());
if (diff < 0)
diff = (0 - diff);
return ((diff < IDfreshnessSlack) ? _B_TRUE : _B_FALSE);
}
/*
* Function: HAisIDok
*
* Arguments: StoredIDHigh - Locally stored high order 32 bit replay ID
* StoredIDLow - Locally stored low order 32 bit replay ID
* IDHigh - High order 32 bit replay ID
* IDLow - Low order 32 bit replay ID
* ReplayStyle - Replay type.
*
* Description: This routine will validate the Mobile Node's ID
* using the replay style configured within the Security
* Assocation.
*
* Returns: boolean_t, TRUE if the ID is valid
*/
boolean_t
HAisIDok(uint32_t StoredIDHigh, uint32_t StoredIDLow,
uint32_t IDHigh, uint32_t IDLow, int ReplayStyle)
{
if (ReplayStyle == TIMESTAMPS) {
if (isIDgreater(StoredIDHigh, StoredIDLow, IDHigh, IDLow) &&
isIDfresh(IDHigh, IDLow))
return (_B_TRUE);
else
return (_B_FALSE);
} else if (ReplayStyle == NONE) {
return (_B_TRUE);
} else {
return (_B_FALSE);
}
}
/*
* Function: HAnewID
*
* Arguments: newIDHigh - Locally stored high order 32 bit replay ID
* newIDLow - Locally stored low order 32 bit replay ID
* IDHigh - High order 32 bit replay ID
* IDLow - Low order 32 bit replay ID
* ReplayStyle - Replay type.
* IDmatched - specifies whether the ID provided
* should be used.
*
* Description: This function will update the locally stored ID
*
* Returns:
*/
void
HAnewID(uint32_t *newIDHigh, uint32_t *newIDLow, uint32_t IDHigh,
uint32_t IDLow, int ReplayStyle, boolean_t IDmatched)
{
if (ReplayStyle == TIMESTAMPS) {
*newIDHigh = IDmatched ? IDHigh : CurrentTimeNTPSec();
} else {
*newIDHigh = 0;
}
*newIDLow = IDLow;
}
/*
* Function: HAstoreID
*
* Arguments: newIDHigh - Locally stored high order 32 bit replay ID
* newIDLow - Locally stored low order 32 bit replay ID
* IDHigh - High order 32 bit replay ID
* IDLow - Low order 32 bit replay ID
* ReplayStyle - Replay type.
* IDmatched - specifies whether the ID provided
* should be used.
*
* Description: This function will store the IDs locally
*
* Returns:
*/
void
HAstoreID(uint32_t *StoredIDHigh, uint32_t *StoredIDLow, uint32_t IDHigh,
uint32_t IDLow, int ReplayStyle, boolean_t IDmatched)
{
if (((ReplayStyle == TIMESTAMPS) && IDmatched)) {
*StoredIDHigh = IDHigh;
*StoredIDLow = IDLow;
}
}
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