/*
 *   $Id: interface.c,v 1.18 2006/08/24 11:41:39 psavola Exp $
 *
 *   Authors:
 *    Lars Fenneberg		<lf@elemental.net>	 
 *
 *   This software is Copyright 1996,1997 by the above mentioned author(s), 
 *   All Rights Reserved.
 *
 *   The license which is distributed with this software in the file COPYRIGHT
 *   applies to this software. If your distribution is missing this file, you
 *   may request it from <pekkas@netcore.fi>.
 *
 */

#include <config.h>
#include <includes.h>
#include <radvd.h>
#include <defaults.h>

void
iface_init_defaults(struct Interface *iface)
{
	memset(iface, 0, sizeof(struct Interface));

	iface->HasFailed	  = 0;
	iface->IgnoreIfMissing	  = DFLT_IgnoreIfMissing;
	iface->AdvSendAdvert	  = DFLT_AdvSendAdv;
	iface->MaxRtrAdvInterval  = DFLT_MaxRtrAdvInterval;
	iface->AdvSourceLLAddress = DFLT_AdvSourceLLAddress;
	iface->AdvReachableTime	  = DFLT_AdvReachableTime;
	iface->AdvRetransTimer    = DFLT_AdvRetransTimer;
	iface->AdvLinkMTU	  = DFLT_AdvLinkMTU;
	iface->AdvCurHopLimit	  = DFLT_AdvCurHopLimit;
	iface->AdvIntervalOpt	  = DFLT_AdvIntervalOpt;
	iface->AdvHomeAgentInfo	  = DFLT_AdvHomeAgentInfo;
	iface->AdvHomeAgentFlag	  = DFLT_AdvHomeAgentFlag;
	iface->HomeAgentPreference = DFLT_HomeAgentPreference;
	iface->MinDelayBetweenRAs   = DFLT_MinDelayBetweenRAs;
	iface->AdvMobRtrSupportFlag = DFLT_AdvMobRtrSupportFlag;

	iface->MinRtrAdvInterval = -1;
	iface->AdvDefaultLifetime = -1;
	iface->AdvDefaultPreference = DFLT_AdvDefaultPreference;
	iface->HomeAgentLifetime = -1;
}

void
prefix_init_defaults(struct AdvPrefix *prefix)
{
	memset(prefix, 0, sizeof(struct AdvPrefix));
		
	prefix->AdvOnLinkFlag = DFLT_AdvOnLinkFlag;
	prefix->AdvAutonomousFlag = DFLT_AdvAutonomousFlag;
	prefix->AdvRouterAddr = DFLT_AdvRouterAddr;
	prefix->AdvValidLifetime = DFLT_AdvValidLifetime;
	prefix->AdvPreferredLifetime = DFLT_AdvPreferredLifetime;
	prefix->if6to4[0] = 0;
	prefix->enabled = 1;
}

void
route_init_defaults(struct AdvRoute *route, struct Interface *iface)
{
	memset(route, 0, sizeof(struct AdvRoute));
		
	route->AdvRouteLifetime = DFLT_AdvRouteLifetime(iface);
	route->AdvRoutePreference = DFLT_AdvRoutePreference;
}

void
rdnss_init_defaults(struct AdvRDNSS *rdnss, struct Interface *iface)
{
	memset(rdnss, 0, sizeof(struct AdvRDNSS));
		
	rdnss->AdvRDNSSPreference = DFLT_AdvRDNSSPreference;
	rdnss->AdvRDNSSOpenFlag = DFLT_AdvRDNSSOpenFlag;
	rdnss->AdvRDNSSLifetime = DFLT_AdvRDNSSLifetime(iface);
	rdnss->AdvRDNSSNumber = 0;
}

int
check_iface(struct Interface *iface)
{
	struct AdvPrefix *prefix;
	struct AdvRoute *route;
	int res = 0;
	int MIPv6 = 0;

	/* Check if we use Mobile IPv6 extensions */
	if (iface->AdvHomeAgentFlag || iface->AdvHomeAgentInfo ||
		iface->AdvIntervalOpt)
	{
		MIPv6 = 1;
		flog(LOG_INFO, "using Mobile IPv6 extensions");
	}

	prefix = iface->AdvPrefixList;	
	while (!MIPv6 && prefix)
	{
		if (prefix->AdvRouterAddr)
		{
			MIPv6 = 1;
		}
		prefix = prefix->next;
	}

	if (iface->MinRtrAdvInterval < 0)
		iface->MinRtrAdvInterval = DFLT_MinRtrAdvInterval(iface);

	if ((iface->MinRtrAdvInterval < (MIPv6 ? MIN_MinRtrAdvInterval_MIPv6 : MIN_MinRtrAdvInterval)) || 
		    (iface->MinRtrAdvInterval > MAX_MinRtrAdvInterval(iface)))
	{
		flog(LOG_ERR, 
			"MinRtrAdvInterval for %s (%.2f) must be at least %.2f but no more than 3/4 of MaxRtrAdvInterval (%.2f)",
			iface->Name, iface->MinRtrAdvInterval,
			MIPv6 ? MIN_MinRtrAdvInterval_MIPv6 : (int)MIN_MinRtrAdvInterval,
			MAX_MinRtrAdvInterval(iface));
		res = -1;
	}

	if ((iface->MaxRtrAdvInterval < (MIPv6 ? MIN_MaxRtrAdvInterval_MIPv6 : MIN_MaxRtrAdvInterval)) 
			|| (iface->MaxRtrAdvInterval > MAX_MaxRtrAdvInterval))
	{
		flog(LOG_ERR, 
			"MaxRtrAdvInterval for %s (%.2f) must be between %.2f and %d",
			iface->Name, iface->MaxRtrAdvInterval,
			MIPv6 ? MIN_MaxRtrAdvInterval_MIPv6 : (int)MIN_MaxRtrAdvInterval,
			MAX_MaxRtrAdvInterval);
		res = -1;
	}

	if (iface->MinDelayBetweenRAs < (MIPv6 ? MIN_DELAY_BETWEEN_RAS_MIPv6 : MIN_DELAY_BETWEEN_RAS)) 
	{
		flog(LOG_ERR, 
			"MinDelayBetweenRAs for %s (%.2f) must be at least %.2f",
			iface->Name, iface->MinDelayBetweenRAs,
			MIPv6 ? MIN_DELAY_BETWEEN_RAS_MIPv6 : MIN_DELAY_BETWEEN_RAS);
		res = -1;
	}

	if ((iface->AdvLinkMTU != 0) &&
	   ((iface->AdvLinkMTU < MIN_AdvLinkMTU) || 
	   (iface->if_maxmtu != -1 && (iface->AdvLinkMTU > iface->if_maxmtu))))
	{
		flog(LOG_ERR,  "AdvLinkMTU for %s (%u) must be zero or between %u and %u",
		iface->Name, iface->AdvLinkMTU, MIN_AdvLinkMTU, iface->if_maxmtu);
		res = -1;
	}

	if (iface->AdvReachableTime >  MAX_AdvReachableTime)
	{
		flog(LOG_ERR, 
			"AdvReachableTime for %s (%u) must not be greater than %u",
			iface->Name, iface->AdvReachableTime, MAX_AdvReachableTime);
		res = -1;
	}

	if (iface->AdvCurHopLimit > MAX_AdvCurHopLimit)
	{
		flog(LOG_ERR, "AdvCurHopLimit for %s (%u) must not be greater than %u",
			iface->Name, iface->AdvCurHopLimit, MAX_AdvCurHopLimit);
		res = -1;
	}

	if (iface->AdvDefaultLifetime < 0)
		iface->AdvDefaultLifetime = DFLT_AdvDefaultLifetime(iface);

	if ((iface->AdvDefaultLifetime != 0) &&
	   ((iface->AdvDefaultLifetime > MAX_AdvDefaultLifetime) ||
	    (iface->AdvDefaultLifetime < MIN_AdvDefaultLifetime(iface))))
	{
		flog(LOG_ERR, 
			"AdvDefaultLifetime for %s (%u) must be zero or between %u and %u",
			iface->Name, iface->AdvDefaultLifetime, (int)MIN_AdvDefaultLifetime(iface),
			MAX_AdvDefaultLifetime);
		res = -1;
	}

	/* Mobile IPv6 ext */
	if (iface->HomeAgentLifetime < 0)
		iface->HomeAgentLifetime = DFLT_HomeAgentLifetime(iface);

	/* Mobile IPv6 ext */
	if (iface->AdvHomeAgentInfo)
	{
		if ((iface->HomeAgentLifetime > MAX_HomeAgentLifetime) ||
			(iface->HomeAgentLifetime < MIN_HomeAgentLifetime))
		{
			flog(LOG_ERR, 
				"HomeAgentLifetime for %s (%u) must be between %u and %u",
				iface->Name, iface->HomeAgentLifetime,
				MIN_HomeAgentLifetime, MAX_HomeAgentLifetime);
			res = -1;
		}
	}

	/* Mobile IPv6 ext */
	if (iface->AdvHomeAgentInfo && !(iface->AdvHomeAgentFlag))
	{
		flog(LOG_ERR, 
			"AdvHomeAgentFlag for %s must be set with HomeAgentInfo", iface->Name);
		res = -1;
	}
	if (iface->AdvMobRtrSupportFlag && !(iface->AdvHomeAgentInfo))
	{
		flog(LOG_ERR, 
			"AdvHomeAgentInfo for %s must be set with AdvMobRtrSupportFlag", iface->Name);
		res = -1;
	}

	/* XXX: need this? prefix = iface->AdvPrefixList; */

	while (prefix)
	{
		if (prefix->PrefixLen > MAX_PrefixLen)
		{
			flog(LOG_ERR, "invalid prefix length (%u) for %s", prefix->PrefixLen, iface->Name);
			res = -1;
		}

		if (prefix->AdvPreferredLifetime > prefix->AdvValidLifetime)
		{
			flog(LOG_ERR, "AdvValidLifetime for %s (%u) must be "
				"greater than AdvPreferredLifetime for", 
				iface->Name, prefix->AdvValidLifetime);
			res = -1;
		}

		prefix = prefix->next;
	}


	route = iface->AdvRouteList;

	while(route)
	{
		if (route->PrefixLen > MAX_PrefixLen)
		{
			flog(LOG_ERR, "invalid route prefix length (%u) for %s", route->PrefixLen, iface->Name);
			res = -1;
		}

		route = route->next;
	}

	return res;
}