DSR route request queue Since DSR is an on demand routing we queue requests while looking for route. More...

#include "dsr-rcache.h"

Inheritance diagram for ns3::dsr::DsrRouteCache:

Collaboration diagram for ns3::dsr::DsrRouteCache:

Classes
struct	Neighbor
	Structure to manage neighbor state. More...

Public Types
typedef std::list< DsrRouteCacheEntry::IP_VECTOR >	routeVector
	Define the vector of route entries. More...

Public Member Functions
	DsrRouteCache ()

virtual	~DsrRouteCache ()

void	AddArpCache (Ptr< ArpCache > a)
	Add ARP cache to be used to allow layer 2 notifications processing. More...

void	AddNeighbor (std::vector< Ipv4Address > nodeList, Ipv4Address ownAddress, Time expire)
	Add to the neighbor list. More...

bool	AddRoute (DsrRouteCacheEntry &rt)
	Add route cache entry if it doesn't yet exist in route cache. More...

bool	AddRoute_Link (DsrRouteCacheEntry::IP_VECTOR nodelist, Ipv4Address node)
	dd route link to cache More...

uint16_t	CheckUniqueAckId (Ipv4Address nextHop)
	Check for duplicate ids and save new entries if the id is not present in the table. More...

void	Clear ()
	Delete all entries from routing table. More...

void	ClearMac ()
	Remove all entries. More...

void	DelArpCache (Ptr< ArpCache >)
	Don't use the provided ARP cache any more (interface is down) More...

void	DeleteAllRoutesIncludeLink (Ipv4Address errorSrc, Ipv4Address unreachNode, Ipv4Address node)
	Delete all the routes which includes the link from next hop address that has just been notified as unreachable. More...

bool	DeleteRoute (Ipv4Address dst)
	Delete the route with certain destination address. More...

bool	FindSameRoute (DsrRouteCacheEntry &rt, std::list< DsrRouteCacheEntry > &rtVector)
	Find the same route in the route cache. More...

uint16_t	GetAckSize ()
	Get the ack table size. More...

Time	GetBadLinkLifetime () const
	Get bad link lifetime function. More...

Time	GetCacheTimeout () const
	Get cache timeout value. More...

Callback< void, Ipv4Address, uint8_t >	GetCallback () const
	Handle link failure callback. More...

Time	GetExpireTime (Ipv4Address addr)
	Return expire time for neighbor node with address addr, if exists, else return 0. More...

Time	GetInitStability () const
	Get initial stability. More...

uint32_t	GetMaxCacheLen () const
	Get the max queue length. More...

uint32_t	GetMaxEntriesEachDst () const
	Get max entries for each destination. More...

Time	GetMinLifeTime () const
	Get minimum lifetime. More...

uint64_t	GetStabilityDecrFactor () const
	Get stability decrease factor. More...

uint64_t	GetStabilityIncrFactor () const
	Get stability increase factor. More...

bool	GetSubRoute () const
	Get subroute indicator. More...

Callback< void, WifiMacHeader const & >	GetTxErrorCallback () const
	Get callback to ProcessTxError, this callback is trying to use the wifi mac tx error header to notify a link layer drop event, however, it is not fully supported yet. More...

Time	GetUseExtends () const
	Get use extends. More...

bool	IsLinkCache ()
	is link cached More...

bool	IsNeighbor (Ipv4Address addr)
	Check that node with address addr is neighbor. More...

Mac48Address	LookupMacAddress (Ipv4Address addr)
	Find MAC address by IP using list of ARP caches. More...

bool	LookupRoute (Ipv4Address id, DsrRouteCacheEntry &rt)
	Lookup route cache entry with destination address dst. More...

DsrRouteCache &	operator= (DsrRouteCache const &)=delete

void	Print (std::ostream &os)
	Print route cache. More...

void	PrintRouteVector (std::list< DsrRouteCacheEntry > route)
	Print all the route vector elements from the route list. More...

void	PrintVector (std::vector< Ipv4Address > &vec)
	Print the route vector elements. More...

void	ProcessTxError (WifiMacHeader const &hdr)
	Process layer 2 TX error notification. More...

void	Purge ()
	Delete all outdated entries and invalidate valid entry if Lifetime is expired. More...

void	PurgeLinkNode ()
	Purge from the cache if the stability time expired. More...

void	PurgeMac ()
	Remove all expired mac entries. More...

void	RebuildBestRouteTable (Ipv4Address source)
	Rebuild the best route table. More...

void	RemoveLastEntry (std::list< DsrRouteCacheEntry > &rtVector)
	Remove the aged route cache entries when the route cache is full. More...

void	ScheduleTimer ()
	Schedule m_ntimer. More...

void	SetBadLinkLifetime (Time t)
	Set bad link lifetime function. More...

void	SetCacheTimeout (Time t)
	Set cache timeout value. More...

void	SetCacheType (std::string type)
	Dijsktra algorithm to get the best route from m_netGraph and update the m_bestRoutesTable_link when current graph information has changed. More...

void	SetCallback (Callback< void, Ipv4Address, uint8_t > cb)
	Handle link failure callback. More...

void	SetInitStability (Time initStability)
	Set initial stability. More...

void	SetMaxCacheLen (uint32_t len)
	Set the max queue length. More...

void	SetMaxEntriesEachDst (uint32_t entries)
	Set max entries for each destination. More...

void	SetMinLifeTime (Time minLifeTime)
	Set minimum lifetime. More...

void	SetStabilityDecrFactor (uint64_t decrFactor)
	Set stability decrease factor. More...

void	SetStabilityIncrFactor (uint64_t incrFactor)
	Set stability increase factor. More...

void	SetSubRoute (bool subRoute)
	Set subroute indicator. More...

void	SetUseExtends (Time useExtends)
	Set use extends. More...

void	UpdateNeighbor (std::vector< Ipv4Address > nodeList, Time expire)
	Update expire time for entry with address addr, if it exists, else add new entry. More...

void	UpdateNetGraph ()
	Update the Net Graph for the link and node cache has changed. More...

bool	UpdateRouteEntry (Ipv4Address dst)
	Update route cache entry if it has been recently used and successfully delivered the data packet. More...

void	UseExtends (DsrRouteCacheEntry::IP_VECTOR rt)
	When a link from the Route Cache is used in routing a packet originated or salvaged by that node, the stability metric for each of the two endpoint nodes of that link is incremented by the amount of time since that link was last used. More...

Public Member Functions inherited from ns3::Object
	Object ()
	Constructor. More...

virtual	~Object ()
	Destructor. More...

void	AggregateObject (Ptr< Object > other)
	Aggregate two Objects together. More...

void	Dispose (void)
	Dispose of this Object. More...

AggregateIterator	GetAggregateIterator (void) const
	Get an iterator to the Objects aggregated to this one. More...

virtual TypeId	GetInstanceTypeId (void) const
	Get the most derived TypeId for this Object. More...

template<>
Ptr< Object >	GetObject () const
	Specialization of () for objects of type ns3::Object. More...

template<typename T >
Ptr< T >	GetObject (TypeId tid) const
	Get a pointer to the requested aggregated Object by TypeId. More...

template<>
Ptr< Object >	GetObject (TypeId tid) const
	Specialization of (TypeId tid) for objects of type ns3::Object. More...

template<typename T >
Ptr< T >	GetObject (void) const
	Get a pointer to the requested aggregated Object. More...

void	Initialize (void)
	Invoke DoInitialize on all Objects aggregated to this one. More...

bool	IsInitialized (void) const
	Check if the object has been initialized. More...

Public Member Functions inherited from ns3::SimpleRefCount< Object, ObjectBase, ObjectDeleter >
	SimpleRefCount ()
	Default constructor. More...

	SimpleRefCount (const SimpleRefCount &o[[maybe_unused]])
	Copy constructor. More...

uint32_t	GetReferenceCount (void) const
	Get the reference count of the object. More...

SimpleRefCount &	operator= ([[maybe_unused]] const SimpleRefCount &o)
	Assignment operator. More...

void	Ref (void) const
	Increment the reference count. More...

void	Unref (void) const
	Decrement the reference count. More...

Public Member Functions inherited from ns3::ObjectBase
virtual	~ObjectBase ()
	Virtual destructor. More...

void	GetAttribute (std::string name, AttributeValue &value) const
	Get the value of an attribute, raising fatal errors if unsuccessful. More...

bool	GetAttributeFailSafe (std::string name, AttributeValue &value) const
	Get the value of an attribute without raising erros. More...

void	SetAttribute (std::string name, const AttributeValue &value)
	Set a single attribute, raising fatal errors if unsuccessful. More...

bool	SetAttributeFailSafe (std::string name, const AttributeValue &value)
	Set a single attribute without raising errors. More...

bool	TraceConnect (std::string name, std::string context, const CallbackBase &cb)
	Connect a TraceSource to a Callback with a context. More...

bool	TraceConnectWithoutContext (std::string name, const CallbackBase &cb)
	Connect a TraceSource to a Callback without a context. More...

bool	TraceDisconnect (std::string name, std::string context, const CallbackBase &cb)
	Disconnect from a TraceSource a Callback previously connected with a context. More...

bool	TraceDisconnectWithoutContext (std::string name, const CallbackBase &cb)
	Disconnect from a TraceSource a Callback previously connected without a context. More...

Static Public Member Functions
static TypeId	GetTypeId ()
	Get the type ID. More...

Static Public Member Functions inherited from ns3::Object
static TypeId	GetTypeId (void)
	Register this type. More...

Static Public Member Functions inherited from ns3::ObjectBase
static TypeId	GetTypeId (void)
	Get the type ID. More...

Public Attributes
std::vector< Ptr< ArpCache > >	m_arp
	list of ARP cached to be used for layer 2 notifications processing More...

Time	m_delay
	This timeout deals with the passive ack. More...

Callback< void, Ipv4Address, uint8_t >	m_handleLinkFailure
	The following code handles link-layer acks. More...

std::vector< Neighbor >	m_nb
	vector of entries More...

Timer	m_ntimer
	Timer for neighbor's list. Schedule Purge(). More...

Callback< void, WifiMacHeader const & >	m_txErrorCallback
	TX error callback. More...

Private Types
typedef std::list< DsrRouteCacheEntry >	routeEntryVector
	Define the route cache data structure. More...

Private Member Functions
bool	DecStability (Ipv4Address node)
	decrease the stability of the node More...

bool	IncStability (Ipv4Address node)
	increase the stability of the node More...

bool	LookupRoute_Link (Ipv4Address id, DsrRouteCacheEntry &rt)
	used by LookupRoute when LinkCache More...

Private Attributes
std::map< Ipv4Address, uint16_t >	m_ackIdCache
	The id cache to ensure all the ids are unique. More...

Time	m_badLinkLifetime
	The time for which the neighboring node is put into the blacklist. More...

std::map< Ipv4Address, DsrRouteCacheEntry::IP_VECTOR >	m_bestRoutesTable_link
	for link route cache More...

Time	m_initStability
	initial stability More...

bool	m_isLinkCache
	Check if the route is using path cache or link cache. More...

std::map< Link, DsrLinkStab >	m_linkCache
	The data structure to store link info. More...

uint32_t	m_maxCacheLen
	The maximum number of packets that we allow a routing protocol to buffer. More...

uint32_t	m_maxEntriesEachDst
	number of entries for each destination More...

Time	m_minLifeTime
	minimum lifetime More...

std::map< Ipv4Address, std::map< Ipv4Address, uint32_t > >	m_netGraph
	Current network graph state for this node, double is weight, which is calculated by the node information and link information, any time some changes of link cache and node cache change the weight and then recompute the best choice for each node. More...

std::map< Ipv4Address, DsrNodeStab >	m_nodeCache
	The data structure to store node info. More...

routeEntryVector	m_routeEntryVector
	Define the route vector. More...

std::map< Ipv4Address, routeEntryVector >	m_sortedRoutes
	Map the ipv4Address to route entry vector. More...

uint32_t	m_stabilityDecrFactor
	stability decrease factor More...

uint32_t	m_stabilityIncrFactor
	stability increase factor More...

bool	m_subRoute
	Check if save the sub route entries or not. More...

Time	m_useExtends
	use extend More...

DsrRouteCacheEntry::IP_VECTOR	m_vector
	The route vector to save the ip addresses for intermediate nodes. More...

Time	RouteCacheTimeout
	The maximum period of time that dsr is allowed to for an unused route. More...

Additional Inherited Members
Protected Member Functions inherited from ns3::Object
	Object (const Object &o)
	Copy an Object. More...

virtual void	DoDispose (void)
	Destructor implementation. More...

virtual void	DoInitialize (void)
	Initialize() implementation. More...

virtual void	NotifyNewAggregate (void)
	Notify all Objects aggregated to this one of a new Object being aggregated. More...

Protected Member Functions inherited from ns3::ObjectBase
void	ConstructSelf (const AttributeConstructionList &attributes)
	Complete construction of ObjectBase; invoked by derived classes. More...

virtual void	NotifyConstructionCompleted (void)
	Notifier called once the ObjectBase is fully constructed. More...

Related Functions inherited from ns3::ObjectBase
static TypeId	GetObjectIid (void)
	Ensure the TypeId for ObjectBase gets fully configured to anchor the inheritance tree properly. More...

Detailed Description

DSR route request queue Since DSR is an on demand routing we queue requests while looking for route.

Config Paths

ns3::dsr::DsrRouteCache is accessible through the following paths with Config::Set and Config::Connect:

"/NodeList/[i]/$ns3::dsr::DsrRouting/RouteCache"

No Attributes are defined for this type.
No TraceSources are defined for this type.
Size of this type is 568 bytes (on a 64-bit architecture).

Definition at line 380 of file dsr-rcache.h.

Member Typedef Documentation

◆ routeEntryVector

typedef std::list<DsrRouteCacheEntry> ns3::dsr::DsrRouteCache::routeEntryVector

private

Define the route cache data structure.

Definition at line 763 of file dsr-rcache.h.

◆ routeVector

typedef std::list<DsrRouteCacheEntry::IP_VECTOR> ns3::dsr::DsrRouteCache::routeVector

Define the vector of route entries.

Definition at line 403 of file dsr-rcache.h.

Constructor & Destructor Documentation

◆ DsrRouteCache()

ns3::dsr::DsrRouteCache::DsrRouteCache ( )

Definition at line 147 of file dsr-rcache.cc.

References m_delay, m_ntimer, m_txErrorCallback, ns3::MakeCallback(), ProcessTxError(), PurgeMac(), ns3::Timer::SetDelay(), and ns3::Timer::SetFunction().

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◆ ~DsrRouteCache()

ns3::dsr::DsrRouteCache::~DsrRouteCache ( )

virtual

Definition at line 162 of file dsr-rcache.cc.

References m_sortedRoutes, and NS_LOG_FUNCTION_NOARGS.

Member Function Documentation

◆ AddArpCache()

void ns3::dsr::DsrRouteCache::AddArpCache ( Ptr< ArpCache > a )

Add ARP cache to be used to allow layer 2 notifications processing.

Parameters

a ARP cache

Definition at line 1213 of file dsr-rcache.cc.

References m_arp.

◆ AddNeighbor()

void ns3::dsr::DsrRouteCache::AddNeighbor	(	std::vector< Ipv4Address >	nodeList,
		Ipv4Address	ownAddress,
		Time	expire
	)

Add to the neighbor list.

Parameters

nodeList	neighbor list
ownAddress	local address
expire	expiration time

Definition at line 1143 of file dsr-rcache.cc.

References LookupMacAddress(), m_nb, ns3::Simulator::Now(), NS_LOG_DEBUG, NS_LOG_LOGIC, and PurgeMac().

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◆ AddRoute()

bool ns3::dsr::DsrRouteCache::AddRoute ( DsrRouteCacheEntry & rt )

Add route cache entry if it doesn't yet exist in route cache.

Parameters

rt	route cache entry

Returns: true on success

Save the new route cache along with the destination address in map

Drop the most aged packet when buffer reaches to max

Save the new route cache along with the destination address in map

Definition at line 657 of file dsr-rcache.cc.

References ns3::dsr::CompareRoutesExpire(), FindSameRoute(), ns3::dsr::DsrRouteCacheEntry::GetDestination(), ns3::dsr::DsrRouteCacheEntry::GetExpireTime(), ns3::dsr::DsrRouteCacheEntry::GetVector(), m_maxEntriesEachDst, m_sortedRoutes, NS_LOG_DEBUG, NS_LOG_FUNCTION, NS_LOG_INFO, Purge(), RemoveLastEntry(), test-ns3::result, and ns3::Time::S.

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◆ AddRoute_Link()

bool ns3::dsr::DsrRouteCache::AddRoute_Link	(	DsrRouteCacheEntry::IP_VECTOR	nodelist,
		Ipv4Address	node
	)

dd route link to cache

Parameters

nodelist	vector of nodes
node	ip address of node to add

Returns: true if the link is cached

Purge the link node cache first

This is the node stability

Link represent the one link for the route

Link stability

Set the link stability as the smallest node stability

Set the link stability as the m)minLifeTime, default is 1 second

Definition at line 562 of file dsr-rcache.cc.

References ns3::Time::As(), ns3::dsr::DsrLinkStab::GetLinkStability(), m_initStability, m_linkCache, m_minLifeTime, m_nodeCache, NS_LOG_DEBUG, NS_LOG_FUNCTION, NS_LOG_LOGIC, ns3::dsr::Link::Print(), ns3::dsr::DsrLinkStab::Print(), PurgeLinkNode(), RebuildBestRouteTable(), ns3::Time::S, ns3::dsr::DsrLinkStab::SetLinkStability(), ns3::dsr::DsrNodeStab::SetNodeStability(), and UpdateNetGraph().

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◆ CheckUniqueAckId()

uint16_t ns3::dsr::DsrRouteCache::CheckUniqueAckId ( Ipv4Address nextHop )

Check for duplicate ids and save new entries if the id is not present in the table.

This part of code maintains an Acknowledgment id cache for next hop and remove duplicate ids.

Parameters

nextHop to check for in cache

Returns: ack ID

Definition at line 1051 of file dsr-rcache.cc.

References m_ackIdCache, NS_LOG_FUNCTION, and NS_LOG_LOGIC.

◆ Clear()

void ns3::dsr::DsrRouteCache::Clear ( void )

inline

Delete all entries from routing table.

Definition at line 619 of file dsr-rcache.h.

References m_routeEntryVector.

◆ ClearMac()

void ns3::dsr::DsrRouteCache::ClearMac ( )

inline

Remove all entries.

Definition at line 706 of file dsr-rcache.h.

References m_nb.

◆ DecStability()

bool ns3::dsr::DsrRouteCache::DecStability ( Ipv4Address node )

private

decrease the stability of the node

Parameters

node	the ip address of the node we want to decrease stability

Returns: true if success

Todo:: remove it here

Definition at line 539 of file dsr-rcache.cc.

References ns3::Time::As(), m_initStability, m_nodeCache, m_stabilityDecrFactor, NS_LOG_FUNCTION, NS_LOG_INFO, and ns3::Time::S.

Referenced by DeleteAllRoutesIncludeLink().

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◆ DelArpCache()

void ns3::dsr::DsrRouteCache::DelArpCache ( Ptr< ArpCache > a )

Don't use the provided ARP cache any more (interface is down)

Parameters

a ARP cache

Definition at line 1219 of file dsr-rcache.cc.

References m_arp.

◆ DeleteAllRoutesIncludeLink()

void ns3::dsr::DsrRouteCache::DeleteAllRoutesIncludeLink	(	Ipv4Address	errorSrc,
		Ipv4Address	unreachNode,
		Ipv4Address	node
	)

Delete all the routes which includes the link from next hop address that has just been notified as unreachable.

Parameters

errorSrc	The error source address
unreachNode	The unreachable node
node	This node's ip address

Todo:: get rid of this one

Definition at line 774 of file dsr-rcache.cc.

References first::address, ns3::dsr::CompareRoutesExpire(), DecStability(), IsLinkCache(), bianchi11ax::k, m_linkCache, m_nodeCache, m_sortedRoutes, m_subRoute, NS_LOG_DEBUG, NS_LOG_FUNCTION, NS_LOG_LOGIC, Purge(), PurgeLinkNode(), RebuildBestRouteTable(), ns3::dsr::DsrRouteCacheEntry::SetDestination(), ns3::dsr::DsrRouteCacheEntry::SetExpireTime(), ns3::dsr::DsrRouteCacheEntry::SetVector(), and UpdateNetGraph().

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◆ DeleteRoute()

bool ns3::dsr::DsrRouteCache::DeleteRoute ( Ipv4Address dst )

Delete the route with certain destination address.

Parameters

dst	the destination address of the routes that should be deleted

Returns: true if the route was deleted

Definition at line 760 of file dsr-rcache.cc.

References m_sortedRoutes, NS_LOG_FUNCTION, NS_LOG_LOGIC, and Purge().

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◆ FindSameRoute()

bool ns3::dsr::DsrRouteCache::FindSameRoute	(	DsrRouteCacheEntry &	rt,
		std::list< DsrRouteCacheEntry > &	rtVector
	)

Find the same route in the route cache.

Parameters

rt	entry with destination address dst, if exists
rtVector	the route vector

Returns: true if same

Definition at line 727 of file dsr-rcache.cc.

References ns3::Time::As(), ns3::dsr::CompareRoutesExpire(), ns3::dsr::DsrRouteCacheEntry::GetDestination(), ns3::dsr::DsrRouteCacheEntry::GetExpireTime(), ns3::dsr::DsrRouteCacheEntry::GetVector(), m_sortedRoutes, NS_LOG_DEBUG, NS_LOG_FUNCTION, test-ns3::result, and ns3::Time::S.

Referenced by AddRoute().

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◆ GetAckSize()

uint16_t ns3::dsr::DsrRouteCache::GetAckSize ( )

Get the ack table size.

Returns: ack size

Definition at line 1073 of file dsr-rcache.cc.

References m_ackIdCache.

◆ GetBadLinkLifetime()

Time ns3::dsr::DsrRouteCache::GetBadLinkLifetime ( ) const

inline

Get bad link lifetime function.

Returns: the bad link lifetime

Definition at line 474 of file dsr-rcache.h.

References m_badLinkLifetime.

◆ GetCacheTimeout()

Time ns3::dsr::DsrRouteCache::GetCacheTimeout ( ) const

inline

Get cache timeout value.

Returns: the cache timeout time

Definition at line 442 of file dsr-rcache.h.

References RouteCacheTimeout.

◆ GetCallback()

Callback<void, Ipv4Address, uint8_t > ns3::dsr::DsrRouteCache::GetCallback ( ) const

inline

Handle link failure callback.

Returns: The callback to LinkFailure

Definition at line 742 of file dsr-rcache.h.

References m_handleLinkFailure.

◆ GetExpireTime()

Time ns3::dsr::DsrRouteCache::GetExpireTime ( Ipv4Address addr )

Return expire time for neighbor node with address addr, if exists, else return 0.

Parameters

addr	IP address

Returns: expire time

Definition at line 1099 of file dsr-rcache.cc.

References m_nb, ns3::Simulator::Now(), NS_LOG_FUNCTION, PurgeMac(), and ns3::Seconds().

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◆ GetInitStability()

Time ns3::dsr::DsrRouteCache::GetInitStability ( ) const

inline

Get initial stability.

Returns: the initial stability

Definition at line 522 of file dsr-rcache.h.

References m_initStability.

◆ GetMaxCacheLen()

uint32_t ns3::dsr::DsrRouteCache::GetMaxCacheLen ( ) const

inline

Get the max queue length.

Returns: the maximum queue length

Definition at line 426 of file dsr-rcache.h.

References m_maxCacheLen.

◆ GetMaxEntriesEachDst()

uint32_t ns3::dsr::DsrRouteCache::GetMaxEntriesEachDst ( ) const

inline

Get max entries for each destination.

Returns: the maximum entries for each destination

Definition at line 458 of file dsr-rcache.h.

References m_maxEntriesEachDst.

◆ GetMinLifeTime()

Time ns3::dsr::DsrRouteCache::GetMinLifeTime ( ) const

inline

Get minimum lifetime.

Returns: the minimum lifetime

Definition at line 538 of file dsr-rcache.h.

References m_minLifeTime.

◆ GetStabilityDecrFactor()

uint64_t ns3::dsr::DsrRouteCache::GetStabilityDecrFactor ( ) const

inline

Get stability decrease factor.

Returns: the stability decrease factor

Definition at line 490 of file dsr-rcache.h.

References m_stabilityDecrFactor.

◆ GetStabilityIncrFactor()

uint64_t ns3::dsr::DsrRouteCache::GetStabilityIncrFactor ( ) const

inline

Get stability increase factor.

Returns: the stability increase factor

Definition at line 506 of file dsr-rcache.h.

References m_stabilityIncrFactor.

◆ GetSubRoute()

bool ns3::dsr::DsrRouteCache::GetSubRoute ( ) const

inline

Get subroute indicator.

Returns: true if a subroute exists

Definition at line 410 of file dsr-rcache.h.

References m_subRoute.

◆ GetTxErrorCallback()

Callback<void, WifiMacHeader const &> ns3::dsr::DsrRouteCache::GetTxErrorCallback ( ) const

inline

Get callback to ProcessTxError, this callback is trying to use the wifi mac tx error header to notify a link layer drop event, however, it is not fully supported yet.

Returns: The callback to ProcessTxError

Definition at line 725 of file dsr-rcache.h.

References m_txErrorCallback.

◆ GetTypeId()

TypeId ns3::dsr::DsrRouteCache::GetTypeId ( void )

static

Get the type ID.

Returns: the object TypeId

Definition at line 137 of file dsr-rcache.cc.

References ns3::TypeId::SetParent().

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◆ GetUseExtends()

Time ns3::dsr::DsrRouteCache::GetUseExtends ( ) const

inline

Get use extends.

Returns: the use extends time

Definition at line 554 of file dsr-rcache.h.

References m_useExtends.

◆ IncStability()

bool ns3::dsr::DsrRouteCache::IncStability ( Ipv4Address node )

private

increase the stability of the node

Parameters

node	the ip address of the node we want to increase stability

Returns: true if success

Todo:: get rid of the debug here

Definition at line 515 of file dsr-rcache.cc.

References ns3::Time::As(), m_initStability, m_nodeCache, m_stabilityIncrFactor, NS_LOG_FUNCTION, NS_LOG_INFO, and ns3::Time::S.

Referenced by UseExtends().

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◆ IsLinkCache()

bool ns3::dsr::DsrRouteCache::IsLinkCache ( )

is link cached

Returns: true if the link is cached

Definition at line 310 of file dsr-rcache.cc.

References m_isLinkCache, and NS_LOG_FUNCTION.

Referenced by DeleteAllRoutesIncludeLink(), and LookupRoute().

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◆ IsNeighbor()

bool ns3::dsr::DsrRouteCache::IsNeighbor ( Ipv4Address addr )

Check that node with address addr is neighbor.

This part maintains a neighbor list to handle unidirectional links and link-layer acks.

Parameters

addr	IP address

Returns: true if neighbor

Definition at line 1083 of file dsr-rcache.cc.

References m_nb, NS_LOG_FUNCTION, and PurgeMac().

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◆ LookupMacAddress()

Mac48Address ns3::dsr::DsrRouteCache::LookupMacAddress ( Ipv4Address addr )

Find MAC address by IP using list of ARP caches.

Parameters

addr	the IPv4 address to look for

Returns: The MAC address

Definition at line 1225 of file dsr-rcache.cc.

References ns3::Mac48Address::ConvertFrom(), ns3::ArpCache::Entry::GetMacAddress(), ns3::ArpCache::Entry::IsAlive(), ns3::ArpCache::Entry::IsExpired(), ns3::ArpCache::Entry::IsPermanent(), and m_arp.

Referenced by AddNeighbor(), and UpdateNeighbor().

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◆ LookupRoute()

bool ns3::dsr::DsrRouteCache::LookupRoute	(	Ipv4Address	id,
		DsrRouteCacheEntry &	rt
	)

Lookup route cache entry with destination address dst.

Parameters

id	destination address
rt	entry with destination address id, if exists

Returns: true on success

Definition at line 208 of file dsr-rcache.cc.

References ns3::dsr::CompareRoutesExpire(), IsLinkCache(), bianchi11ax::k, LookupRoute_Link(), m_sortedRoutes, NS_LOG_FUNCTION, NS_LOG_INFO, NS_LOG_LOGIC, Purge(), ns3::dsr::DsrRouteCacheEntry::SetDestination(), ns3::dsr::DsrRouteCacheEntry::SetExpireTime(), and ns3::dsr::DsrRouteCacheEntry::SetVector().

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◆ LookupRoute_Link()

bool ns3::dsr::DsrRouteCache::LookupRoute_Link	(	Ipv4Address	id,
		DsrRouteCacheEntry &	rt
	)

private

used by LookupRoute when LinkCache

Parameters

id	the ip address we are looking for
rt	the route cache entry to store the found one

Returns: true if route route found

We need to purge the link node cache

Definition at line 433 of file dsr-rcache.cc.

References ns3::dsr::DsrRouteCacheEntry::GetVector(), m_bestRoutesTable_link, NS_LOG_FUNCTION, NS_LOG_INFO, NS_LOG_LOGIC, PrintVector(), PurgeLinkNode(), RouteCacheTimeout, ns3::dsr::DsrRouteCacheEntry::SetDestination(), ns3::dsr::DsrRouteCacheEntry::SetExpireTime(), and ns3::dsr::DsrRouteCacheEntry::SetVector().

Referenced by LookupRoute().

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◆ operator=()

DsrRouteCache& ns3::dsr::DsrRouteCache::operator= ( DsrRouteCache const & )

delete

◆ Print()

void ns3::dsr::DsrRouteCache::Print ( std::ostream & os )

Print route cache.

Parameters

os	the output stream

Definition at line 1032 of file dsr-rcache.cc.

References m_routeEntryVector, NS_LOG_FUNCTION, and Purge().

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◆ PrintRouteVector()

void ns3::dsr::DsrRouteCache::PrintRouteVector ( std::list< DsrRouteCacheEntry > route )

Print all the route vector elements from the route list.

Parameters

route the route list

Definition at line 953 of file dsr-rcache.cc.

References NS_LOG_FUNCTION, NS_LOG_INFO, and PrintVector().

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◆ PrintVector()

void ns3::dsr::DsrRouteCache::PrintVector ( std::vector< Ipv4Address > & vec )

Print the route vector elements.

Parameters

vec	the route vector

Definition at line 932 of file dsr-rcache.cc.

References NS_LOG_DEBUG, and NS_LOG_FUNCTION.

Referenced by LookupRoute_Link(), PrintRouteVector(), and RebuildBestRouteTable().

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◆ ProcessTxError()

void ns3::dsr::DsrRouteCache::ProcessTxError ( WifiMacHeader const & hdr )

Process layer 2 TX error notification.

Parameters

hdr	Wi-Fi Mac Header

Definition at line 1242 of file dsr-rcache.cc.

References ns3::WifiMacHeader::GetAddr1(), m_nb, and PurgeMac().

Referenced by DsrRouteCache().

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◆ Purge()

void ns3::dsr::DsrRouteCache::Purge ( )

Delete all outdated entries and invalidate valid entry if Lifetime is expired.

Definition at line 965 of file dsr-rcache.cc.

References m_sortedRoutes, NS_LOG_DEBUG, NS_LOG_FUNCTION, and ns3::Seconds().

Referenced by AddRoute(), DeleteAllRoutesIncludeLink(), DeleteRoute(), LookupRoute(), and Print().

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◆ PurgeLinkNode()

void ns3::dsr::DsrRouteCache::PurgeLinkNode ( )

Purge from the cache if the stability time expired.

may need to remove them after verify

Definition at line 465 of file dsr-rcache.cc.

References m_linkCache, m_nodeCache, NS_LOG_DEBUG, NS_LOG_FUNCTION, ns3::Time::S, and ns3::Seconds().

Referenced by AddRoute_Link(), DeleteAllRoutesIncludeLink(), LookupRoute_Link(), and UseExtends().

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◆ PurgeMac()

void ns3::dsr::DsrRouteCache::PurgeMac ( )

Remove all expired mac entries.

Todo:: disable temporarily

Definition at line 1180 of file dsr-rcache.cc.

References ns3::Timer::Cancel(), m_handleLinkFailure, m_nb, m_ntimer, NS_LOG_LOGIC, and ns3::Timer::Schedule().

Referenced by DsrRouteCache(), AddNeighbor(), GetExpireTime(), IsNeighbor(), ProcessTxError(), and UpdateNeighbor().

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◆ RebuildBestRouteTable()

void ns3::dsr::DsrRouteCache::RebuildBestRouteTable ( Ipv4Address source )

Rebuild the best route table.

Note: Use MAXWEIGHT to represeant maximum weight, use the IPv4 broadcast address of 255.255.255.255 to represent a null preceding address

Parameters

source The source address used for computing the routes

The following are initialize-single-source

The following is the core of Dijkstra algorithm

Definition at line 317 of file dsr-rcache.cc.

References ns3::Ipv4Address::IsBroadcast(), bianchi11ax::k, m_bestRoutesTable_link, m_linkCache, m_netGraph, MAXWEIGHT, NS_LOG_FUNCTION, NS_LOG_INFO, NS_LOG_LOGIC, and PrintVector().

Referenced by AddRoute_Link(), and DeleteAllRoutesIncludeLink().

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◆ RemoveLastEntry()

void ns3::dsr::DsrRouteCache::RemoveLastEntry ( std::list< DsrRouteCacheEntry > & rtVector )

Remove the aged route cache entries when the route cache is full.

Parameters

rtVector the route cache to scan.

Definition at line 170 of file dsr-rcache.cc.

References NS_LOG_FUNCTION.

Referenced by AddRoute().

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◆ ScheduleTimer()

void ns3::dsr::DsrRouteCache::ScheduleTimer ( )

Schedule m_ntimer.

Definition at line 1206 of file dsr-rcache.cc.

References ns3::Timer::Cancel(), m_ntimer, and ns3::Timer::Schedule().

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◆ SetBadLinkLifetime()

void ns3::dsr::DsrRouteCache::SetBadLinkLifetime ( Time t )

inline

Set bad link lifetime function.

Parameters

t	the bad link lifetime

Definition at line 482 of file dsr-rcache.h.

References m_badLinkLifetime.

◆ SetCacheTimeout()

void ns3::dsr::DsrRouteCache::SetCacheTimeout ( Time t )

inline

Set cache timeout value.

Parameters

t	the cache timeout time

Definition at line 450 of file dsr-rcache.h.

References RouteCacheTimeout.

◆ SetCacheType()

void ns3::dsr::DsrRouteCache::SetCacheType ( std::string type )

Dijsktra algorithm to get the best route from m_netGraph and update the m_bestRoutesTable_link when current graph information has changed.

Parameters

type	The type of the cache

Definition at line 291 of file dsr-rcache.cc.

References m_isLinkCache, NS_LOG_FUNCTION, and NS_LOG_INFO.

◆ SetCallback()

void ns3::dsr::DsrRouteCache::SetCallback ( Callback< void, Ipv4Address, uint8_t > cb )

inline

Handle link failure callback.

Parameters

cb	the callback to be set

Definition at line 734 of file dsr-rcache.h.

References m_handleLinkFailure.

◆ SetInitStability()

void ns3::dsr::DsrRouteCache::SetInitStability ( Time initStability )

inline

Set initial stability.

Parameters

initStability the initial stability

Definition at line 530 of file dsr-rcache.h.

References m_initStability.

◆ SetMaxCacheLen()

void ns3::dsr::DsrRouteCache::SetMaxCacheLen ( uint32_t len )

inline

Set the max queue length.

Parameters

len	the maximum queue length

Definition at line 434 of file dsr-rcache.h.

References m_maxCacheLen.

◆ SetMaxEntriesEachDst()

void ns3::dsr::DsrRouteCache::SetMaxEntriesEachDst ( uint32_t entries )

inline

Set max entries for each destination.

Parameters

entries the maximum entries for each destination

Definition at line 466 of file dsr-rcache.h.

References m_maxEntriesEachDst.

◆ SetMinLifeTime()

void ns3::dsr::DsrRouteCache::SetMinLifeTime ( Time minLifeTime )

inline

Set minimum lifetime.

Parameters

minLifeTime the minimum lifetime

Definition at line 546 of file dsr-rcache.h.

References m_minLifeTime.

◆ SetStabilityDecrFactor()

void ns3::dsr::DsrRouteCache::SetStabilityDecrFactor ( uint64_t decrFactor )

inline

Set stability decrease factor.

Parameters

decrFactor the stability decrease factor

Definition at line 498 of file dsr-rcache.h.

References m_stabilityDecrFactor.

◆ SetStabilityIncrFactor()

void ns3::dsr::DsrRouteCache::SetStabilityIncrFactor ( uint64_t incrFactor )

inline

Set stability increase factor.

Parameters

incrFactor the stability increase factor

Definition at line 514 of file dsr-rcache.h.

References m_stabilityIncrFactor.

◆ SetSubRoute()

void ns3::dsr::DsrRouteCache::SetSubRoute ( bool subRoute )

inline

Set subroute indicator.

Parameters

subRoute the subroute indicator

Definition at line 418 of file dsr-rcache.h.

References m_subRoute.

◆ SetUseExtends()

void ns3::dsr::DsrRouteCache::SetUseExtends ( Time useExtends )

inline

Set use extends.

Parameters

useExtends the use extends time

Definition at line 562 of file dsr-rcache.h.

References m_useExtends.

◆ UpdateNeighbor()

void ns3::dsr::DsrRouteCache::UpdateNeighbor	(	std::vector< Ipv4Address >	nodeList,
		Time	expire
	)

Update expire time for entry with address addr, if it exists, else add new entry.

Parameters

nodeList	list of addresses
expire	expiration time

Definition at line 1115 of file dsr-rcache.cc.

References LookupMacAddress(), m_nb, max, ns3::Simulator::Now(), NS_LOG_FUNCTION, NS_LOG_LOGIC, and PurgeMac().

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◆ UpdateNetGraph()

void ns3::dsr::DsrRouteCache::UpdateNetGraph ( )

Update the Net Graph for the link and node cache has changed.

Todo:: May need to set different weight for different link here later

Definition at line 500 of file dsr-rcache.cc.

References m_linkCache, m_netGraph, and NS_LOG_FUNCTION.

Referenced by AddRoute_Link(), and DeleteAllRoutesIncludeLink().

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◆ UpdateRouteEntry()

bool ns3::dsr::DsrRouteCache::UpdateRouteEntry ( Ipv4Address dst )

Update route cache entry if it has been recently used and successfully delivered the data packet.

Parameters

dst	destination address of the route

Returns: true in success

Definition at line 178 of file dsr-rcache.cc.

References ns3::dsr::CompareRoutesExpire(), m_sortedRoutes, NS_LOG_FUNCTION, NS_LOG_LOGIC, test-ns3::result, RouteCacheTimeout, and ns3::dsr::DsrRouteCacheEntry::SetExpireTime().

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◆ UseExtends()

void ns3::dsr::DsrRouteCache::UseExtends ( DsrRouteCacheEntry::IP_VECTOR rt )

When a link from the Route Cache is used in routing a packet originated or salvaged by that node, the stability metric for each of the two endpoint nodes of that link is incremented by the amount of time since that link was last used.

When a link is used in a route chosen for a packet originated or salvaged by this node, the link's lifetime is set to be at least UseExtends into the future

Parameters

rt	cache entry

Purge the link node cache first

Todo:: remove after debug

Increase the stability of the node cache

Definition at line 611 of file dsr-rcache.cc.

References IncStability(), m_initStability, m_linkCache, m_nodeCache, m_useExtends, NS_LOG_FUNCTION, NS_LOG_INFO, NS_LOG_LOGIC, PurgeLinkNode(), and ns3::Time::S.

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Member Data Documentation

◆ m_ackIdCache

std::map<Ipv4Address, uint16_t> ns3::dsr::DsrRouteCache::m_ackIdCache

private

The id cache to ensure all the ids are unique.

Definition at line 771 of file dsr-rcache.h.

Referenced by CheckUniqueAckId(), and GetAckSize().

◆ m_arp

std::vector<Ptr<ArpCache> > ns3::dsr::DsrRouteCache::m_arp

list of ARP cached to be used for layer 2 notifications processing

Definition at line 865 of file dsr-rcache.h.

Referenced by AddArpCache(), DelArpCache(), and LookupMacAddress().

◆ m_badLinkLifetime

Time ns3::dsr::DsrRouteCache::m_badLinkLifetime

private

The time for which the neighboring node is put into the blacklist.

Definition at line 751 of file dsr-rcache.h.

Referenced by GetBadLinkLifetime(), and SetBadLinkLifetime().

◆ m_bestRoutesTable_link

std::map<Ipv4Address, DsrRouteCacheEntry::IP_VECTOR> ns3::dsr::DsrRouteCache::m_bestRoutesTable_link

private

for link route cache

Definition at line 788 of file dsr-rcache.h.

Referenced by LookupRoute_Link(), and RebuildBestRouteTable().

◆ m_delay

Time ns3::dsr::DsrRouteCache::m_delay

This timeout deals with the passive ack.

Definition at line 867 of file dsr-rcache.h.

Referenced by DsrRouteCache().

◆ m_handleLinkFailure

Callback<void, Ipv4Address, uint8_t > ns3::dsr::DsrRouteCache::m_handleLinkFailure

The following code handles link-layer acks.

link failure callback

Definition at line 857 of file dsr-rcache.h.

Referenced by GetCallback(), PurgeMac(), and SetCallback().

◆ m_initStability

Time ns3::dsr::DsrRouteCache::m_initStability

private

initial stability

Definition at line 757 of file dsr-rcache.h.

Referenced by AddRoute_Link(), DecStability(), GetInitStability(), IncStability(), SetInitStability(), and UseExtends().

◆ m_isLinkCache

bool ns3::dsr::DsrRouteCache::m_isLinkCache

private

Check if the route is using path cache or link cache.

Definition at line 773 of file dsr-rcache.h.

Referenced by IsLinkCache(), and SetCacheType().

◆ m_linkCache

std::map<Link, DsrLinkStab> ns3::dsr::DsrRouteCache::m_linkCache

private

The data structure to store link info.

Definition at line 789 of file dsr-rcache.h.

Referenced by AddRoute_Link(), DeleteAllRoutesIncludeLink(), PurgeLinkNode(), RebuildBestRouteTable(), UpdateNetGraph(), and UseExtends().

◆ m_maxCacheLen

uint32_t ns3::dsr::DsrRouteCache::m_maxCacheLen

private

The maximum number of packets that we allow a routing protocol to buffer.

Definition at line 749 of file dsr-rcache.h.

Referenced by GetMaxCacheLen(), and SetMaxCacheLen().

◆ m_maxEntriesEachDst

uint32_t ns3::dsr::DsrRouteCache::m_maxEntriesEachDst

private

number of entries for each destination

Definition at line 769 of file dsr-rcache.h.

Referenced by AddRoute(), GetMaxEntriesEachDst(), and SetMaxEntriesEachDst().

◆ m_minLifeTime

Time ns3::dsr::DsrRouteCache::m_minLifeTime

private

minimum lifetime

Definition at line 758 of file dsr-rcache.h.

Referenced by AddRoute_Link(), GetMinLifeTime(), and SetMinLifeTime().

◆ m_nb

std::vector<Neighbor> ns3::dsr::DsrRouteCache::m_nb

vector of entries

Definition at line 863 of file dsr-rcache.h.

Referenced by AddNeighbor(), ClearMac(), GetExpireTime(), IsNeighbor(), ProcessTxError(), PurgeMac(), and UpdateNeighbor().

◆ m_netGraph

std::map<Ipv4Address, std::map<Ipv4Address, uint32_t> > ns3::dsr::DsrRouteCache::m_netGraph

private

Current network graph state for this node, double is weight, which is calculated by the node information and link information, any time some changes of link cache and node cache change the weight and then recompute the best choice for each node.

Definition at line 786 of file dsr-rcache.h.

Referenced by RebuildBestRouteTable(), and UpdateNetGraph().

◆ m_nodeCache

std::map<Ipv4Address, DsrNodeStab> ns3::dsr::DsrRouteCache::m_nodeCache

private

The data structure to store node info.

Definition at line 790 of file dsr-rcache.h.

Referenced by AddRoute_Link(), DecStability(), DeleteAllRoutesIncludeLink(), IncStability(), PurgeLinkNode(), and UseExtends().

◆ m_ntimer

Timer ns3::dsr::DsrRouteCache::m_ntimer

Timer for neighbor's list. Schedule Purge().

Definition at line 861 of file dsr-rcache.h.

Referenced by DsrRouteCache(), PurgeMac(), and ScheduleTimer().

◆ m_routeEntryVector

routeEntryVector ns3::dsr::DsrRouteCache::m_routeEntryVector

private

Define the route vector.

Definition at line 767 of file dsr-rcache.h.

Referenced by Clear(), and Print().

◆ m_sortedRoutes

std::map<Ipv4Address, routeEntryVector> ns3::dsr::DsrRouteCache::m_sortedRoutes

private

Map the ipv4Address to route entry vector.

Definition at line 765 of file dsr-rcache.h.

Referenced by ~DsrRouteCache(), AddRoute(), DeleteAllRoutesIncludeLink(), DeleteRoute(), FindSameRoute(), LookupRoute(), Purge(), and UpdateRouteEntry().

◆ m_stabilityDecrFactor

uint32_t ns3::dsr::DsrRouteCache::m_stabilityDecrFactor

private

stability decrease factor

Definition at line 755 of file dsr-rcache.h.

Referenced by DecStability(), GetStabilityDecrFactor(), and SetStabilityDecrFactor().

◆ m_stabilityIncrFactor

uint32_t ns3::dsr::DsrRouteCache::m_stabilityIncrFactor

private

stability increase factor

Definition at line 756 of file dsr-rcache.h.

Referenced by GetStabilityIncrFactor(), IncStability(), and SetStabilityIncrFactor().

◆ m_subRoute

bool ns3::dsr::DsrRouteCache::m_subRoute

private

Check if save the sub route entries or not.

Definition at line 775 of file dsr-rcache.h.

Referenced by DeleteAllRoutesIncludeLink(), GetSubRoute(), and SetSubRoute().

◆ m_txErrorCallback

Callback<void, WifiMacHeader const &> ns3::dsr::DsrRouteCache::m_txErrorCallback

TX error callback.

Definition at line 859 of file dsr-rcache.h.

Referenced by DsrRouteCache(), and GetTxErrorCallback().

◆ m_useExtends

Time ns3::dsr::DsrRouteCache::m_useExtends

private

use extend

Definition at line 759 of file dsr-rcache.h.

Referenced by GetUseExtends(), SetUseExtends(), and UseExtends().

◆ m_vector

DsrRouteCacheEntry::IP_VECTOR ns3::dsr::DsrRouteCache::m_vector

private

The route vector to save the ip addresses for intermediate nodes.

Definition at line 748 of file dsr-rcache.h.

◆ RouteCacheTimeout

Time ns3::dsr::DsrRouteCache::RouteCacheTimeout

private

The maximum period of time that dsr is allowed to for an unused route.

Definition at line 750 of file dsr-rcache.h.

Referenced by GetCacheTimeout(), LookupRoute_Link(), SetCacheTimeout(), and UpdateRouteEntry().

The documentation for this class was generated from the following files:

src/dsr/model/dsr-rcache.h
src/dsr/model/dsr-rcache.cc

Classes

Public Types

Public Member Functions

Static Public Member Functions

Public Attributes

Private Types

Private Member Functions

Private Attributes

Additional Inherited Members

Detailed Description

Config Paths

Member Typedef Documentation

◆ routeEntryVector

◆ routeVector

Constructor & Destructor Documentation

◆ DsrRouteCache()

◆ ~DsrRouteCache()

Member Function Documentation

◆ AddArpCache()

◆ AddNeighbor()

◆ AddRoute()

◆ AddRoute_Link()

◆ CheckUniqueAckId()

◆ Clear()

◆ ClearMac()

◆ DecStability()

◆ DelArpCache()

◆ DeleteAllRoutesIncludeLink()

◆ DeleteRoute()

◆ FindSameRoute()

◆ GetAckSize()

◆ GetBadLinkLifetime()

◆ GetCacheTimeout()

◆ GetCallback()

◆ GetExpireTime()

◆ GetInitStability()

◆ GetMaxCacheLen()

◆ GetMaxEntriesEachDst()

◆ GetMinLifeTime()

◆ GetStabilityDecrFactor()

◆ GetStabilityIncrFactor()

◆ GetSubRoute()

◆ GetTxErrorCallback()

◆ GetTypeId()

◆ GetUseExtends()

◆ IncStability()

◆ IsLinkCache()

◆ IsNeighbor()

◆ LookupMacAddress()

◆ LookupRoute()

◆ LookupRoute_Link()

◆ operator=()

◆ Print()

◆ PrintRouteVector()

◆ PrintVector()

◆ ProcessTxError()

◆ Purge()

◆ PurgeLinkNode()

◆ PurgeMac()

◆ RebuildBestRouteTable()

◆ RemoveLastEntry()

◆ ScheduleTimer()

◆ SetBadLinkLifetime()

◆ SetCacheTimeout()

◆ SetCacheType()

◆ SetCallback()

◆ SetInitStability()

◆ SetMaxCacheLen()

◆ SetMaxEntriesEachDst()

◆ SetMinLifeTime()

◆ SetStabilityDecrFactor()

◆ SetStabilityIncrFactor()

◆ SetSubRoute()

◆ SetUseExtends()

◆ UpdateNeighbor()

◆ UpdateNetGraph()

◆ UpdateRouteEntry()

◆ UseExtends()

Member Data Documentation

◆ m_ackIdCache