defrag.h File Reference

#include "threads.h"
#include "util-pool.h"
#include "threadvars.h"
#include "decode.h"

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Data Structures
struct	DefragContext_
struct	Frag_
struct	DefragTracker_

Typedefs
typedef struct DefragContext_	DefragContext
typedef struct Frag_	Frag
typedef struct DefragTracker_	DefragTracker

Functions
int	DefragRbFragCompare (struct Frag_ *a, struct Frag_ *b)
	RB_HEAD (IP_FRAGMENTS, Frag_)
	RB_PROTOTYPE (IP_FRAGMENTS, Frag_, rb, DefragRbFragCompare)
void	DefragInit (void)
void	DefragDestroy (void)
uint8_t	DefragGetOsPolicy (Packet *)
	Get the defrag policy based on the destination address of the packet. More...
void	DefragTrackerFreeFrags (DefragTracker *)
	Free all frags associated with a tracker. More...
Packet *	Defrag (ThreadVars *, DecodeThreadVars *, Packet *)
	Entry point for IPv4 and IPv6 fragments. More...
void	DefragRegisterTests (void)

Detailed Description

Author

Endace Technology Limited, Jason Ish jason.nosp@m..ish.nosp@m.@enda.nosp@m.ce.c.nosp@m.om

Definition in file defrag.h.

Typedef Documentation

DefragContext

typedef struct DefragContext_ DefragContext

A context for an instance of a fragmentation re-assembler, in case we ever need more than one.

DefragTracker

typedef struct DefragTracker_ DefragTracker

A defragmentation tracker. Used to track fragments that make up a single packet.

Frag

typedef struct Frag_ Frag

Storage for an individual fragment.

Function Documentation

Defrag()

Packet* Defrag	(	ThreadVars *	tv,
		DecodeThreadVars *	dtv,
		Packet *	p
	)

Entry point for IPv4 and IPv6 fragments.

Parameters

tv	ThreadVars for the calling decoder.
p	The packet fragment.

Return values

A	new Packet resembling the re-assembled packet if the most recent fragment allowed the packet to be re-assembled, otherwise NULL is returned.

Definition at line 1007 of file defrag.c.

References af, DecodeThreadVars_::counter_defrag_ipv4_fragments, DecodeThreadVars_::counter_defrag_ipv6_fragments, dtv, IPV4_GET_IPOFFSET, IPV4_GET_MF, IPV6_EXTHDR_GET_FH_FLAG, IPV6_EXTHDR_GET_FH_OFFSET, PKT_IS_IPV4, PKT_IS_IPV6, StatsIncr(), and tv.

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DefragDestroy()

void DefragDestroy

(

void

)

Definition at line 1077 of file defrag.c.

References DefragHashShutdown().

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DefragGetOsPolicy()

uint8_t DefragGetOsPolicy

(

Packet *

p

)

Get the defrag policy based on the destination address of the packet.

Parameters

p	The packet used to get the destination address.

Return values

The	defrag policy to use.

Definition at line 928 of file defrag.c.

References GET_IPV4_DST_ADDR_PTR, GET_IPV6_DST_ADDR, PKT_IS_IPV4, PKT_IS_IPV6, SCHInfoGetIPv4HostOSFlavour(), and SCHInfoGetIPv6HostOSFlavour().

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DefragInit()

void DefragInit

(

void

)

Definition at line 1057 of file defrag.c.

References ConfGetInt(), DEFAULT_DEFRAG_HASH_SIZE, and DefragPolicyLoadFromConfig().

Referenced by PreRunInit().

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DefragRbFragCompare()

int DefragRbFragCompare	(	struct Frag_ *	a,
		struct Frag_ *	b
	)

The RB_TREE compare function for fragments.

When it comes to adding fragments, we want subsequent ones with the same offset to be treated as greater than, so we don't have an equal return value here.

Definition at line 523 of file defrag.c.

References Frag_::offset.

DefragRegisterTests()

void DefragRegisterTests

(

void

)

Definition at line 2577 of file defrag.c.

References UtRegisterTest().

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DefragTrackerFreeFrags()

void DefragTrackerFreeFrags

(

DefragTracker *

)

Free all frags associated with a tracker.

Definition at line 153 of file defrag.c.

References SCMutexLock.

Referenced by DefragTrackerClearMemory().

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RB_HEAD()

RB_HEAD	(	IP_FRAGMENTS	,
		Frag_
	)

RB_PROTOTYPE()

RB_PROTOTYPE	(	IP_FRAGMENTS	,
		Frag_	,
		rb	,
		DefragRbFragCompare
	)