nat_reass.h File Reference

NAT plugin virtual fragmentation reassembly. More...

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Data Structures
struct	nat_reass_ip4_key_t
struct	nat_reass_ip6_key_t
struct	nat_reass_main_t

Macros
#define	NAT_REASS_TIMEOUT_DEFAULT   2
#define	NAT_MAX_REASS_DEAFULT   1024
#define	NAT_MAX_FRAG_DEFAULT   5
#define	NAT_REASS_HT_LOAD_FACTOR   (0.75)
#define	NAT_REASS_FLAG_MAX_FRAG_DROP   1

Typedefs
typedef int(*	nat_ip4_reass_walk_fn_t) (nat_reass_ip4_t *reass, void *ctx)
	Call back function when walking IPv4 reassemblies, non-zero return value stop walk. More...
typedef int(*	nat_ip6_reass_walk_fn_t) (nat_reass_ip6_t *reass, void *ctx)
	Call back function when walking IPv6 reassemblies, non-zero return value stop walk. More...

Functions
typedef	CLIB_PACKED (struct{nat_reass_ip4_key_t key;u32 lru_list_index;u32 sess_index;u32 thread_index;f64 last_heard;u32 frags_per_reass_list_head_index;u8 frag_n;u8 flags;}) nat_reass_ip4_t
typedef	CLIB_PACKED (struct{nat_reass_ip6_key_t key;u32 lru_list_index;u32 sess_index;f64 last_heard;u32 frags_per_reass_list_head_index;u8 frag_n;u8 flags;}) nat_reass_ip6_t
int	nat_reass_set (u32 timeout, u16 max_reass, u8 max_frag, u8 drop_frag, u8 is_ip6)
	Set NAT virtual fragmentation reassembly configuration. More...
u32	nat_reass_get_timeout (u8 is_ip6)
	Get reassembly timeout. More...
u16	nat_reass_get_max_reass (u8 is_ip6)
	Get maximum number of concurrent reassemblies. More...
u8	nat_reass_get_max_frag (u8 is_ip6)
	Get maximum number of fragmets per reassembly. More...
u8	nat_reass_is_drop_frag (u8 is_ip6)
	Get status of virtual fragmentation reassembly. More...
clib_error_t *	nat_reass_init (vlib_main_t *vm)
	Initialize NAT virtual fragmentation reassembly. More...
nat_reass_ip4_t *	nat_ip4_reass_find (ip4_address_t src, ip4_address_t dst, u16 frag_id, u8 proto)
	Find reassembly. More...
nat_reass_ip4_t *	nat_ip4_reass_find_or_create (ip4_address_t src, ip4_address_t dst, u16 frag_id, u8 proto, u8 reset_timeout, u32 **bi_to_drop)
	Find or create reassembly. More...
int	nat_ip4_reass_add_fragment (nat_reass_ip4_t *reass, u32 bi, u32 **bi_to_drop)
	Cache fragment. More...
void	nat_ip4_reass_get_frags (nat_reass_ip4_t *reass, u32 **bi)
	Get cached fragments. More...
void	nat_ip4_reass_walk (nat_ip4_reass_walk_fn_t fn, void *ctx)
	Walk IPv4 reassemblies. More...
nat_reass_ip6_t *	nat_ip6_reass_find_or_create (ip6_address_t src, ip6_address_t dst, u32 frag_id, u8 proto, u8 reset_timeout, u32 **bi_to_drop)
	Find or create reassembly. More...
int	nat_ip6_reass_add_fragment (nat_reass_ip6_t *reass, u32 bi, u32 **bi_to_drop)
	Cache fragment. More...
void	nat_ip6_reass_get_frags (nat_reass_ip6_t *reass, u32 **bi)
	Get cached fragments. More...
void	nat_ip6_reass_walk (nat_ip6_reass_walk_fn_t fn, void *ctx)
	Walk IPv6 reassemblies. More...

Detailed Description

NAT plugin virtual fragmentation reassembly.

Definition in file nat_reass.h.

Macro Definition Documentation

#define NAT_MAX_FRAG_DEFAULT   5

Definition at line 30 of file nat_reass.h.

#define NAT_MAX_REASS_DEAFULT   1024

Definition at line 29 of file nat_reass.h.

#define NAT_REASS_FLAG_MAX_FRAG_DROP   1

Definition at line 33 of file nat_reass.h.

#define NAT_REASS_HT_LOAD_FACTOR   (0.75)

Definition at line 31 of file nat_reass.h.

#define NAT_REASS_TIMEOUT_DEFAULT   2

Definition at line 28 of file nat_reass.h.

Typedef Documentation

typedef int(* nat_ip4_reass_walk_fn_t) (nat_reass_ip4_t *reass, void *ctx)

Call back function when walking IPv4 reassemblies, non-zero return value stop walk.

Definition at line 248 of file nat_reass.h.

typedef int(* nat_ip6_reass_walk_fn_t) (nat_reass_ip6_t *reass, void *ctx)

Call back function when walking IPv6 reassemblies, non-zero return value stop walk.

Definition at line 299 of file nat_reass.h.

Function Documentation

typedef CLIB_PACKED

(

struct{nat_reass_ip4_key_t key;u32 lru_list_index;u32 sess_index;u32 thread_index;f64 last_heard;u32 frags_per_reass_list_head_index;u8 frag_n;u8 flags;}

)

typedef CLIB_PACKED

(

struct{nat_reass_ip6_key_t key;u32 lru_list_index;u32 sess_index;f64 last_heard;u32 frags_per_reass_list_head_index;u8 frag_n;u8 flags;}

)

int nat_ip4_reass_add_fragment	(	nat_reass_ip4_t *	reass,
		u32	bi,
		u32 **	bi_to_drop
	)

Cache fragment.

Parameters

reass	Reassembly data.
bi	Buffer index.
bi_to_drop	Fragments to drop.

Returns

0 on success, non-zero value otherwise.

Definition at line 336 of file nat_reass.c.

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nat_reass_ip4_t* nat_ip4_reass_find	(	ip4_address_t	src,
		ip4_address_t	dst,
		u16	frag_id,
		u8	proto
	)

Find reassembly.

Parameters

src	Source IPv4 address.
dst	Destination IPv4 address.
frag_id	Fragment ID.
proto	L4 protocol.

Returns

Reassembly data or 0 if not found.

Definition at line 199 of file nat_reass.c.

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nat_reass_ip4_t* nat_ip4_reass_find_or_create	(	ip4_address_t	src,
		ip4_address_t	dst,
		u16	frag_id,
		u8	proto,
		u8	reset_timeout,
		u32 **	bi_to_drop
	)

Find or create reassembly.

Parameters

src	Source IPv4 address.
dst	Destination IPv4 address.
frag_id	Fragment ID.
proto	L4 protocol.
reset_timeout	If non-zero value reset timeout.
bi_to_drop	Fragments to drop.

Returns

Reassembly data or 0 on failure.

Definition at line 220 of file nat_reass.c.

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void nat_ip4_reass_get_frags	(	nat_reass_ip4_t *	reass,
		u32 **	bi
	)

Get cached fragments.

Parameters

reass	Reassembly data.
bi	Vector of buffer indexes.

Definition at line 368 of file nat_reass.c.

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void nat_ip4_reass_walk	(	nat_ip4_reass_walk_fn_t	fn,
		void *	ctx
	)

Walk IPv4 reassemblies.

Parameters

fn	The function to invoke on each entry visited.
ctx	A context passed in the visit function.

Definition at line 380 of file nat_reass.c.

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int nat_ip6_reass_add_fragment	(	nat_reass_ip6_t *	reass,
		u32	bi,
		u32 **	bi_to_drop
	)

Cache fragment.

Parameters

reass	Reassembly data.
bi	Buffer index.
bi_to_drop	Fragments to drop.

Returns

0 on success, non-zero value otherwise.

Definition at line 542 of file nat_reass.c.

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nat_reass_ip6_t* nat_ip6_reass_find_or_create	(	ip6_address_t	src,
		ip6_address_t	dst,
		u32	frag_id,
		u8	proto,
		u8	reset_timeout,
		u32 **	bi_to_drop
	)

Find or create reassembly.

Parameters

src	Source IPv6 address.
dst	Destination IPv6 address.
frag_id	Fragment ID.
proto	L4 protocol.
reset_timeout	If non-zero value reset timeout.
bi_to_drop	Fragments to drop.

Returns

Reassembly data or 0 on failure.

Definition at line 424 of file nat_reass.c.

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void nat_ip6_reass_get_frags	(	nat_reass_ip6_t *	reass,
		u32 **	bi
	)

Get cached fragments.

Parameters

reass	Reassembly data.
bi	Vector of buffer indexes.

Definition at line 574 of file nat_reass.c.

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void nat_ip6_reass_walk	(	nat_ip6_reass_walk_fn_t	fn,
		void *	ctx
	)

Walk IPv6 reassemblies.

Parameters

fn	The function to invoke on each entry visited.
ctx	A context passed in the visit function.

Definition at line 586 of file nat_reass.c.

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u8 nat_reass_get_max_frag

(

u8

is_ip6

)

Get maximum number of fragmets per reassembly.

Parameters

is_ip6

1 if IPv6, 0 if IPv4.

Returns

maximum number of fragmets per reassembly.

Definition at line 157 of file nat_reass.c.

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u16 nat_reass_get_max_reass

(

u8

is_ip6

)

Get maximum number of concurrent reassemblies.

Parameters

is_ip6

1 if IPv6, 0 if IPv4.

Returns

maximum number of concurrent reassemblies.

Definition at line 146 of file nat_reass.c.

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u32 nat_reass_get_timeout

(

u8

is_ip6

)

Get reassembly timeout.

Parameters

is_ip6

1 if IPv6, 0 if IPv4.

Returns

reassembly timeout.

Definition at line 135 of file nat_reass.c.

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clib_error_t* nat_reass_init

(

vlib_main_t *

vm

)

Initialize NAT virtual fragmentation reassembly.

Parameters

vm	vlib main.

Returns

error code.

Definition at line 605 of file nat_reass.c.

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u8 nat_reass_is_drop_frag

(

u8

is_ip6

)

Get status of virtual fragmentation reassembly.

Parameters

is_ip6

1 if IPv6, 0 if IPv4.

Returns

zero if translate fragments, non-zero value if drop fragments.

Definition at line 168 of file nat_reass.c.

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int nat_reass_set	(	u32	timeout,
		u16	max_reass,
		u8	max_frag,
		u8	drop_frag,
		u8	is_ip6
	)

Set NAT virtual fragmentation reassembly configuration.

Parameters

timeout	Reassembly timeout.
max_reass	Maximum number of concurrent reassemblies.
max_frag	Maximum number of fragmets per reassembly
drop_frag	If zero translate fragments, otherwise drop fragments.
is_ip6	1 if IPv6, 0 if IPv4.

Returns

0 on success, non-zero value otherwise.

Definition at line 85 of file nat_reass.c.

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