nat.c File Reference

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Functions
	VNET_FEATURE_INIT (ip4_snat_in2out, static)
	VNET_FEATURE_INIT (ip4_snat_out2in, static)
	VNET_FEATURE_INIT (ip4_nat_classify, static)
	VNET_FEATURE_INIT (ip4_snat_det_in2out, static)
	VNET_FEATURE_INIT (ip4_snat_det_out2in, static)
	VNET_FEATURE_INIT (ip4_nat_det_classify, static)
	VNET_FEATURE_INIT (ip4_nat44_ed_in2out, static)
	VNET_FEATURE_INIT (ip4_nat44_ed_out2in, static)
	VNET_FEATURE_INIT (ip4_nat44_ed_classify, static)
	VNET_FEATURE_INIT (ip4_snat_in2out_worker_handoff, static)
	VNET_FEATURE_INIT (ip4_snat_out2in_worker_handoff, static)
	VNET_FEATURE_INIT (ip4_nat_handoff_classify, static)
	VNET_FEATURE_INIT (ip4_snat_in2out_fast, static)
	VNET_FEATURE_INIT (ip4_snat_out2in_fast, static)
	VNET_FEATURE_INIT (ip4_snat_hairpin_dst, static)
	VNET_FEATURE_INIT (ip4_nat44_ed_hairpin_dst, static)
	VNET_FEATURE_INIT (ip4_snat_in2out_output, static)
	VNET_FEATURE_INIT (ip4_snat_in2out_output_worker_handoff, static)
	VNET_FEATURE_INIT (ip4_snat_hairpin_src, static)
	VNET_FEATURE_INIT (ip4_nat44_ed_in2out_output, static)
	VNET_FEATURE_INIT (ip4_nat44_ed_hairpin_src, static)
	VNET_FEATURE_INIT (ip4_nat_hairpinning, static)
	VNET_FEATURE_INIT (ip4_nat44_ed_hairpinning, static)
	VLIB_PLUGIN_REGISTER ()
void	nat_free_session_data (snat_main_t *sm, snat_session_t *s, u32 thread_index)
	Free NAT44 session data (lookup keys, external addrres port) More...
snat_user_t *	nat_user_get_or_create (snat_main_t *sm, ip4_address_t *addr, u32 fib_index, u32 thread_index)
	Find or create NAT user. More...
snat_session_t *	nat_session_alloc_or_recycle (snat_main_t *sm, snat_user_t *u, u32 thread_index)
	Allocate new NAT session or recycle last used. More...
snat_session_t *	nat_ed_session_alloc (snat_main_t *sm, snat_user_t *u, u32 thread_index, f64 now)
	Allocate NAT endpoint-dependent session. More...
void	snat_add_del_addr_to_fib (ip4_address_t *addr, u8 p_len, u32 sw_if_index, int is_add)
	Add/del NAT address to FIB. More...
int	snat_add_address (snat_main_t *sm, ip4_address_t *addr, u32 vrf_id, u8 twice_nat)
	Add external address to NAT44 pool. More...
static int	is_snat_address_used_in_static_mapping (snat_main_t *sm, ip4_address_t addr)
void	increment_v4_address (ip4_address_t *a)
	Increment IPv4 address. More...
static void	snat_add_static_mapping_when_resolved (snat_main_t *sm, ip4_address_t l_addr, u16 l_port, u32 sw_if_index, u16 e_port, u32 vrf_id, snat_protocol_t proto, int addr_only, int is_add, u8 *tag, int twice_nat, int out2in_only, int identity_nat)
static u32	get_thread_idx_by_port (u16 e_port)
int	snat_add_static_mapping (ip4_address_t l_addr, ip4_address_t e_addr, u16 l_port, u16 e_port, u32 vrf_id, int addr_only, u32 sw_if_index, snat_protocol_t proto, int is_add, twice_nat_type_t twice_nat, u8 out2in_only, u8 *tag, u8 identity_nat)
	Add/delete NAT44 static mapping. More...
int	nat44_add_del_lb_static_mapping (ip4_address_t e_addr, u16 e_port, snat_protocol_t proto, nat44_lb_addr_port_t *locals, u8 is_add, twice_nat_type_t twice_nat, u8 out2in_only, u8 *tag, u32 affinity)
	Add/delete static mapping with load-balancing (multiple backends) More...
int	snat_del_address (snat_main_t *sm, ip4_address_t addr, u8 delete_sm, u8 twice_nat)
	Delete external address from NAT44 pool. More...
int	snat_interface_add_del (u32 sw_if_index, u8 is_inside, int is_del)
	Enable/disable NAT44 feature on the interface. More...
int	snat_interface_add_del_output_feature (u32 sw_if_index, u8 is_inside, int is_del)
	Enable/disable NAT44 output feature on the interface (postrouting NAT) More...
int	snat_set_workers (uword *bitmap)
	Set NAT plugin workers. More...
static void	snat_ip4_add_del_interface_address_cb (ip4_main_t *im, uword opaque, u32 sw_if_index, ip4_address_t *address, u32 address_length, u32 if_address_index, u32 is_delete)
static void	nat_ip4_add_del_addr_only_sm_cb (ip4_main_t *im, uword opaque, u32 sw_if_index, ip4_address_t *address, u32 address_length, u32 if_address_index, u32 is_delete)
static int	nat_alloc_addr_and_port_default (snat_address_t *addresses, u32 fib_index, u32 thread_index, snat_session_key_t *k, u16 port_per_thread, u32 snat_thread_index)
static clib_error_t *	snat_init (vlib_main_t *vm)
void	snat_free_outside_address_and_port (snat_address_t *addresses, u32 thread_index, snat_session_key_t *k)
	Free outside address and port pair. More...
int	snat_static_mapping_match (snat_main_t *sm, snat_session_key_t match, snat_session_key_t *mapping, u8 by_external, u8 *is_addr_only, twice_nat_type_t *twice_nat, lb_nat_type_t *lb, ip4_address_t *ext_host_addr, u8 *is_identity_nat)
	Match NAT44 static mapping. More...
static_always_inline u16	snat_random_port (u16 min, u16 max)
int	snat_alloc_outside_address_and_port (snat_address_t *addresses, u32 fib_index, u32 thread_index, snat_session_key_t *k, u16 port_per_thread, u32 snat_thread_index)
	Alloc outside address and port. More...
static int	nat_alloc_addr_and_port_mape (snat_address_t *addresses, u32 fib_index, u32 thread_index, snat_session_key_t *k, u16 port_per_thread, u32 snat_thread_index)
static int	nat_alloc_addr_and_port_range (snat_address_t *addresses, u32 fib_index, u32 thread_index, snat_session_key_t *k, u16 port_per_thread, u32 snat_thread_index)
void	nat44_add_del_address_dpo (ip4_address_t addr, u8 is_add)
	Add/delete external address to FIB DPO (out2in DPO mode) More...
u8 *	format_session_kvp (u8 *s, va_list *args)
u8 *	format_static_mapping_kvp (u8 *s, va_list *args)
u8 *	format_user_kvp (u8 *s, va_list *args)
u8 *	format_ed_session_kvp (u8 *s, va_list *args)
static u32	snat_get_worker_in2out_cb (ip4_header_t *ip0, u32 rx_fib_index0)
static u32	snat_get_worker_out2in_cb (ip4_header_t *ip0, u32 rx_fib_index0)
static u32	nat44_ed_get_worker_out2in_cb (ip4_header_t *ip, u32 rx_fib_index)
static clib_error_t *	snat_config (vlib_main_t *vm, unformat_input_t *input)
int	snat_add_interface_address (snat_main_t *sm, u32 sw_if_index, int is_del, u8 twice_nat)
	Add/delete NAT44 pool address from specific interfce. More...
int	nat44_del_session (snat_main_t *sm, ip4_address_t *addr, u16 port, snat_protocol_t proto, u32 vrf_id, int is_in)
	Delete NAT44 session. More...
int	nat44_del_ed_session (snat_main_t *sm, ip4_address_t *addr, u16 port, ip4_address_t *eh_addr, u16 eh_port, u8 proto, u32 vrf_id, int is_in)
	Delete NAT44 endpoint-dependent session. More...
void	nat_set_alloc_addr_and_port_mape (u16 psid, u16 psid_offset, u16 psid_length)
	Set address and port assignment algorithm for MAP-E CE. More...
void	nat_set_alloc_addr_and_port_range (u16 start_port, u16 end_port)
	Set address and port assignment algorithm for port range. More...
void	nat_set_alloc_addr_and_port_default (void)
	Set address and port assignment algorithm to default/standard. More...

Variables
snat_main_t	snat_main

Function Documentation

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

Definition at line 2467 of file nat.c.

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

Definition at line 2426 of file nat.c.

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

Definition at line 2439 of file nat.c.

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

Definition at line 2453 of file nat.c.

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static u32 get_thread_idx_by_port ( u16  e_port )

static

Definition at line 615 of file nat.c.

void increment_v4_address

(

ip4_address_t *

a

)

Increment IPv4 address.

Definition at line 577 of file nat.c.

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static int is_snat_address_used_in_static_mapping ( snat_main_t *  sm, ip4_address_t  addr  )

static

Definition at line 558 of file nat.c.

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void nat44_add_del_address_dpo	(	ip4_address_t	addr,
		u8	is_add
	)

Add/delete external address to FIB DPO (out2in DPO mode)

Parameters

addr	IPv4 address
is_add	1 = add, 0 = delete

Returns

0 on success, non-zero value otherwise

Definition at line 2403 of file nat.c.

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int nat44_add_del_lb_static_mapping	(	ip4_address_t	e_addr,
		u16	e_port,
		snat_protocol_t	proto,
		nat44_lb_addr_port_t *	locals,
		u8	is_add,
		twice_nat_type_t	twice_nat,
		u8	out2in_only,
		u8 *	tag,
		u32	affinity
	)

Add/delete static mapping with load-balancing (multiple backends)

Parameters

e_addr	external IPv4 address
e_port	external port number
proto	L4 protocol
locals	list of local backends
is_add	1 = add, 0 = delete
twice_nat	twice-nat mode
out2in_only	if 1 rule match only out2in direction
tag	opaque string tag
affinity	0 = disabled, otherwise client IP affinity sticky time

Returns

0 on success, non-zero value otherwise

Definition at line 1119 of file nat.c.

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int nat44_del_ed_session	(	snat_main_t *	sm,
		ip4_address_t *	addr,
		u16	port,
		ip4_address_t *	eh_addr,
		u16	eh_port,
		u8	proto,
		u32	vrf_id,
		int	is_in
	)

Delete NAT44 endpoint-dependent session.

Parameters

addr	IPv4 address
port	L4 port number
proto	L4 protocol
vrf_id	VRF ID
is_in	1 = inside network addres and por pair, 0 = outside

Returns

0 on success, non-zero value otherwise

Definition at line 3181 of file nat.c.

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int nat44_del_session	(	snat_main_t *	sm,
		ip4_address_t *	addr,
		u16	port,
		snat_protocol_t	proto,
		u32	vrf_id,
		int	is_in
	)

Delete NAT44 session.

Parameters

addr	IPv4 address
port	L4 port number
proto	L4 protocol
vrf_id	VRF ID
is_in	1 = inside network addres and por pair, 0 = outside

Returns

0 on success, non-zero value otherwise

Definition at line 3138 of file nat.c.

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static u32 nat44_ed_get_worker_out2in_cb ( ip4_header_t *  ip, u32  rx_fib_index  )

static

Definition at line 2613 of file nat.c.

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static int nat_alloc_addr_and_port_default ( snat_address_t *  addresses, u32  fib_index, u32  thread_index, snat_session_key_t *  k, u16  port_per_thread, u32  snat_thread_index  )

static

Definition at line 2218 of file nat.c.

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static int nat_alloc_addr_and_port_mape ( snat_address_t *  addresses, u32  fib_index, u32  thread_index, snat_session_key_t *  k, u16  port_per_thread, u32  snat_thread_index  )

static

Definition at line 2305 of file nat.c.

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static int nat_alloc_addr_and_port_range ( snat_address_t *  addresses, u32  fib_index, u32  thread_index, snat_session_key_t *  k, u16  port_per_thread, u32  snat_thread_index  )

static

Definition at line 2355 of file nat.c.

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snat_session_t* nat_ed_session_alloc	(	snat_main_t *	sm,
		snat_user_t *	u,
		u32	thread_index,
		f64	now
	)

Allocate NAT endpoint-dependent session.

Parameters

u	NAT user
thread_index	thread index

Returns

session data structure on success otherwise zero value

Definition at line 391 of file nat.c.

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void nat_free_session_data	(	snat_main_t *	sm,
		snat_session_t *	s,
		u32	thread_index
	)

Free NAT44 session data (lookup keys, external addrres port)

Parameters

s	NAT session
thread_index	thread index

Definition at line 177 of file nat.c.

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static void nat_ip4_add_del_addr_only_sm_cb ( ip4_main_t *  im, uword  opaque, u32  sw_if_index, ip4_address_t *  address, u32  address_length, u32  if_address_index, u32  is_delete  )

static

Definition at line 2921 of file nat.c.

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snat_session_t* nat_session_alloc_or_recycle	(	snat_main_t *	sm,
		snat_user_t *	u,
		u32	thread_index
	)

Allocate new NAT session or recycle last used.

Parameters

u	NAT user
thread_index	thread index

Returns

session data structure on success otherwise zero value

Definition at line 322 of file nat.c.

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void nat_set_alloc_addr_and_port_default

(

void

)

Set address and port assignment algorithm to default/standard.

Definition at line 3248 of file nat.c.

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void nat_set_alloc_addr_and_port_mape	(	u16	psid,
		u16	psid_offset,
		u16	psid_length
	)

Set address and port assignment algorithm for MAP-E CE.

Parameters

psid	Port Set Identifier value
psid_offset	number of offset bits
psid_length	length of PSID

Definition at line 3225 of file nat.c.

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void nat_set_alloc_addr_and_port_range	(	u16	start_port,
		u16	end_port
	)

Set address and port assignment algorithm for port range.

Parameters

start_port	beginning of the port range
end_port	end of the port range

Definition at line 3237 of file nat.c.

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snat_user_t* nat_user_get_or_create	(	snat_main_t *	sm,
		ip4_address_t *	addr,
		u32	fib_index,
		u32	thread_index
	)

Find or create NAT user.

Parameters

addr	IPv4 address
fib_index	FIB table index
thread_index	thread index

Returns

NAT user data structure on success otherwise zero value

Definition at line 278 of file nat.c.

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int snat_add_address	(	snat_main_t *	sm,
		ip4_address_t *	addr,
		u32	vrf_id,
		u8	twice_nat
	)

Add external address to NAT44 pool.

Parameters

addr	IPv4 address
vrf_id	VRF id of tenant, ~0 means independent of VRF
twice_nat	1 if twice NAT address

Returns

0 on success, non-zero value otherwise

Definition at line 493 of file nat.c.

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void snat_add_del_addr_to_fib	(	ip4_address_t *	addr,
		u8	p_len,
		u32	sw_if_index,
		int	is_add
	)

Add/del NAT address to FIB.

Add the external NAT address to the FIB as receive entries. This ensures that VPP will reply to ARP for this address and we don't need to enable proxy ARP on the outside interface.

Parameters

addr	IPv4 address
plen	address prefix length
sw_if_index	software index of the outside interface
is_add	0 = delete, 1 = add.

Definition at line 465 of file nat.c.

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int snat_add_interface_address	(	snat_main_t *	sm,
		u32	sw_if_index,
		int	is_del,
		u8	twice_nat
	)

Add/delete NAT44 pool address from specific interfce.

Parameters

sw_if_index	software index of the interface
is_del	1 = delete, 0 = add
twice_nat	1 = twice NAT address for extenal hosts

Returns

0 on success, non-zero value otherwise

Definition at line 3070 of file nat.c.

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int snat_add_static_mapping	(	ip4_address_t	l_addr,
		ip4_address_t	e_addr,
		u16	l_port,
		u16	e_port,
		u32	vrf_id,
		int	addr_only,
		u32	sw_if_index,
		snat_protocol_t	proto,
		int	is_add,
		twice_nat_type_t	twice_nat,
		u8	out2in_only,
		u8 *	tag,
		u8	identity_nat
	)

Add/delete NAT44 static mapping.

Parameters

l_addr	local IPv4 address
e_addr	external IPv4 address
l_port	local port number
e_port	external port number
vrf_id	local VRF ID
addr_only	1 = 1:1NAT, 0 = 1:1NAPT
sw_if_index	use interface address as external IPv4 address
proto	L4 protocol
is_add	1 = add, 0 = delete
twice_nat	twice-nat mode
out2in_only	if 1 rule match only out2in direction
tag	opaque string tag
identity_nat	identity NAT

Returns

0 on success, non-zero value otherwise

Definition at line 629 of file nat.c.

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static void snat_add_static_mapping_when_resolved ( snat_main_t *  sm, ip4_address_t  l_addr, u16  l_port, u32  sw_if_index, u16  e_port, u32  vrf_id, snat_protocol_t  proto, int  addr_only, int  is_add, u8 *  tag, int  twice_nat, int  out2in_only, int  identity_nat  )

static

Definition at line 586 of file nat.c.

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int snat_alloc_outside_address_and_port	(	snat_address_t *	addresses,
		u32	fib_index,
		u32	thread_index,
		snat_session_key_t *	k,
		u16	port_per_thread,
		u32	snat_thread_index
	)

Alloc outside address and port.

Parameters

addresses	vector of outside addresses
fib_index	FIB table index
thread_index	thread index
k	allocated address and port pair
port_per_thread	number of ports per threead
snat_thread_index	NAT thread index

Returns

0 on success, non-zero value otherwise

Definition at line 2204 of file nat.c.

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static clib_error_t* snat_config ( vlib_main_t *  vm, unformat_input_t *  input  )

static

Definition at line 2706 of file nat.c.

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int snat_del_address	(	snat_main_t *	sm,
		ip4_address_t	addr,
		u8	delete_sm,
		u8	twice_nat
	)

Delete external address from NAT44 pool.

Parameters

addr	IPv4 address
delete_sm	1 if delete static mapping using address
twice_nat	1 if twice NAT address

Returns

0 on success, non-zero value otherwise

Definition at line 1394 of file nat.c.

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void snat_free_outside_address_and_port	(	snat_address_t *	addresses,
		u32	thread_index,
		snat_session_key_t *	k
	)

Free outside address and port pair.

Parameters

addresses	vector of outside addresses
thread_index	thread index
k	adddress, port and protocol

Definition at line 2032 of file nat.c.

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static u32 snat_get_worker_in2out_cb ( ip4_header_t *  ip0, u32  rx_fib_index0  )

static

Definition at line 2485 of file nat.c.

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static u32 snat_get_worker_out2in_cb ( ip4_header_t *  ip0, u32  rx_fib_index0  )

static

Definition at line 2504 of file nat.c.

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static clib_error_t* snat_init ( vlib_main_t *  vm )

static

Definition at line 1932 of file nat.c.

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int snat_interface_add_del	(	u32	sw_if_index,
		u8	is_inside,
		int	is_del
	)

Enable/disable NAT44 feature on the interface.

Parameters

sw_if_index	software index of the interface
is_inside	1 = inside, 0 = outside
is_del	1 = delete, 0 = add

Returns

0 on success, non-zero value otherwise

Definition at line 1508 of file nat.c.

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int snat_interface_add_del_output_feature	(	u32	sw_if_index,
		u8	is_inside,
		int	is_del
	)

Enable/disable NAT44 output feature on the interface (postrouting NAT)

Parameters

sw_if_index	software index of the interface
is_inside	1 = inside, 0 = outside
is_del	1 = delete, 0 = add

Returns

0 on success, non-zero value otherwise

Definition at line 1757 of file nat.c.

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static void snat_ip4_add_del_interface_address_cb ( ip4_main_t *  im, uword  opaque, u32  sw_if_index, ip4_address_t *  address, u32  address_length, u32  if_address_index, u32  is_delete  )

static

Definition at line 2989 of file nat.c.

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static_always_inline u16 snat_random_port	(	u16	min,
		u16	max
	)

Definition at line 2196 of file nat.c.

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int snat_set_workers

(

uword *

bitmap

)

Set NAT plugin workers.

Parameters

bitmap

NAT workers bitmap

Returns

0 on success, non-zero value otherwise

Definition at line 1880 of file nat.c.

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int snat_static_mapping_match	(	snat_main_t *	sm,
		snat_session_key_t	match,
		snat_session_key_t *	mapping,
		u8	by_external,
		u8 *	is_addr_only,
		twice_nat_type_t *	twice_nat,
		lb_nat_type_t *	lb,
		ip4_address_t *	ext_host_addr,
		u8 *	is_identity_nat
	)

Match NAT44 static mapping.

Parameters

match	address and port to match
mapping	external/local address and port of the matched mapping
by_external	if 0 match by local address otherwise match by external address
is_addr_only	1 if matched mapping is address only
twice_nat	matched mapping is twice NAT type
lb	1 if matched mapping is load-balanced
ext_host_addr	external host address

Returns

0 if match found otherwise 1.

Definition at line 2070 of file nat.c.

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VLIB_PLUGIN_REGISTER

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VNET_FEATURE_INIT	(	ip4_snat_in2out	,
		static
	)

VNET_FEATURE_INIT	(	ip4_snat_out2in	,
		static
	)

VNET_FEATURE_INIT	(	ip4_nat_classify	,
		static
	)

VNET_FEATURE_INIT	(	ip4_snat_det_in2out	,
		static
	)

VNET_FEATURE_INIT	(	ip4_snat_det_out2in	,
		static
	)

VNET_FEATURE_INIT	(	ip4_nat_det_classify	,
		static
	)

VNET_FEATURE_INIT	(	ip4_nat44_ed_in2out	,
		static
	)

VNET_FEATURE_INIT	(	ip4_nat44_ed_out2in	,
		static
	)

VNET_FEATURE_INIT	(	ip4_nat44_ed_classify	,
		static
	)

VNET_FEATURE_INIT	(	ip4_snat_in2out_worker_handoff	,
		static
	)

VNET_FEATURE_INIT	(	ip4_snat_out2in_worker_handoff	,
		static
	)

VNET_FEATURE_INIT	(	ip4_nat_handoff_classify	,
		static
	)

VNET_FEATURE_INIT	(	ip4_snat_in2out_fast	,
		static
	)

VNET_FEATURE_INIT	(	ip4_snat_out2in_fast	,
		static
	)

VNET_FEATURE_INIT	(	ip4_snat_hairpin_dst	,
		static
	)

VNET_FEATURE_INIT	(	ip4_nat44_ed_hairpin_dst	,
		static
	)

VNET_FEATURE_INIT	(	ip4_snat_in2out_output	,
		static
	)

VNET_FEATURE_INIT	(	ip4_snat_in2out_output_worker_handoff	,
		static
	)

VNET_FEATURE_INIT	(	ip4_snat_hairpin_src	,
		static
	)

VNET_FEATURE_INIT	(	ip4_nat44_ed_in2out_output	,
		static
	)

VNET_FEATURE_INIT	(	ip4_nat44_ed_hairpin_src	,
		static
	)

VNET_FEATURE_INIT	(	ip4_nat_hairpinning	,
		static
	)

VNET_FEATURE_INIT	(	ip4_nat44_ed_hairpinning	,
		static
	)

Variable Documentation

snat_main_t snat_main

Definition at line 37 of file nat.c.