cnat_session.h File Reference

Include dependency graph for cnat_session.h:

This graph shows which files directly or indirectly include this file:

Go to the source code of this file.

Data Structures
struct	cnat_session_t_
	A session represents the memory of a translation. More...

Typedefs
typedef struct cnat_session_t_	cnat_session_t
	A session represents the memory of a translation. More...
typedef enum cnat_session_flag_t_	cnat_session_flag_t
typedef walk_rc_t(*	cnat_session_walk_cb_t) (const cnat_session_t *session, void *ctx)
	Callback function invoked during a walk of all translations. More...

Enumerations
enum	cnat_session_flag_t_ { CNAT_SESSION_FLAG_HAS_SNAT = (1 << 0), CNAT_SESSION_FLAG_ALLOC_PORT = (1 << 1), CNAT_SESSION_FLAG_NO_CLIENT = (1 << 2) }

Functions
u8 *	format_cnat_session (u8 *s, va_list *args)
	STATIC_ASSERT (STRUCT_OFFSET_OF(cnat_session_t, key)==STRUCT_OFFSET_OF(clib_bihash_kv_40_48_t, key), "key overlaps")
	Ensure the session object correctly overlays the bihash key/value pair. More...
	STATIC_ASSERT (STRUCT_OFFSET_OF(cnat_session_t, value)==STRUCT_OFFSET_OF(clib_bihash_kv_40_48_t, value), "value overlaps")
	STATIC_ASSERT (sizeof(cnat_session_t)==sizeof(clib_bihash_kv_40_48_t), "session kvp")
void	cnat_session_walk (cnat_session_walk_cb_t cb, void *ctx)
	Walk/visit each of the cnat session. More...
u64	cnat_session_scan (vlib_main_t *vm, f64 start_time, int i)
	Scan the session DB for expired sessions. More...
int	cnat_session_purge (void)
	Purge all the sessions. More...

Variables
clib_bihash_40_48_t	cnat_session_db
	The DB of sessions. More...

Typedef Documentation

cnat_session_flag_t

typedef enum cnat_session_flag_t_ cnat_session_flag_t

cnat_session_t

typedef struct cnat_session_t_ cnat_session_t

A session represents the memory of a translation.

In the tx direction (from behind to in front of the NAT), the session is preserved so subsequent packets follow the same path even if the translation has been updated. In the tx direction the session represents the swap from the VIP to the server address In the RX direction the swap is from the server address/port to VIP.

A session exists only as key and value in the bihash, there is no pool for this object. If there were a pool, one would need to be concerned about what worker is using it.

cnat_session_walk_cb_t

typedef walk_rc_t(* cnat_session_walk_cb_t) (const cnat_session_t *session, void *ctx)

Callback function invoked during a walk of all translations.

Definition at line 131 of file cnat_session.h.

Enumeration Type Documentation

cnat_session_flag_t_

enum cnat_session_flag_t_

Enumerator
CNAT_SESSION_FLAG_HAS_SNAT
CNAT_SESSION_FLAG_ALLOC_PORT
CNAT_SESSION_FLAG_NO_CLIENT

Definition at line 102 of file cnat_session.h.

Function Documentation

cnat_session_purge()

int cnat_session_purge

(

void

)

Purge all the sessions.

Definition at line 140 of file cnat_session.c.

Here is the call graph for this function:

Here is the caller graph for this function:

cnat_session_scan()

u64 cnat_session_scan	(	vlib_main_t *	vm,
		f64	start_time,
		int	i
	)

Scan the session DB for expired sessions.

Definition at line 157 of file cnat_session.c.

Here is the call graph for this function:

Here is the caller graph for this function:

cnat_session_walk()

void cnat_session_walk	(	cnat_session_walk_cb_t	cb,
		void *	ctx
	)

Walk/visit each of the cnat session.

Definition at line 44 of file cnat_session.c.

Here is the call graph for this function:

Here is the caller graph for this function:

format_cnat_session()

u8* format_cnat_session	(	u8 *	s,
		va_list *	args
	)

Definition at line 70 of file cnat_session.c.

Here is the call graph for this function:

Here is the caller graph for this function:

STATIC_ASSERT() [1/3]

STATIC_ASSERT	(	STRUCT_OFFSET_OF(cnat_session_t, key)	= =STRUCT_OFFSET_OF(clib_bihash_kv_40_48_t, key),
		"key overlaps"
	)

Ensure the session object correctly overlays the bihash key/value pair.

STATIC_ASSERT() [2/3]

STATIC_ASSERT	(	STRUCT_OFFSET_OF(cnat_session_t, value)	= =STRUCT_OFFSET_OF(clib_bihash_kv_40_48_t, value),
		"value overlaps"
	)

STATIC_ASSERT() [3/3]

STATIC_ASSERT	(	sizeof(cnat_session_t)	= =sizeof(clib_bihash_kv_40_48_t),
		"session kvp"
	)

Variable Documentation

cnat_session_db

clib_bihash_40_48_t cnat_session_db

The DB of sessions.

Definition at line 23 of file cnat_session.c.