nat64.c File Reference

NAT64 implementation. More...

Include dependency graph for nat64.c:

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Functions
	VNET_FEATURE_INIT (nat64_in2out, static)
	VNET_FEATURE_INIT (nat64_out2in, static)
	VNET_FEATURE_INIT (nat64_in2out_handoff, static)
	VNET_FEATURE_INIT (nat64_out2in_handoff, static)
static void	nat64_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)
u32	nat64_get_worker_in2out (ip6_address_t *addr)
	Get worker thread index for NAT64 in2out. More...
u32	nat64_get_worker_out2in (ip4_header_t *ip)
	Get worker thread index for NAT64 out2in. More...
clib_error_t *	nat64_init (vlib_main_t *vm)
	Initialize NAT64. More...
static void	nat64_free_out_addr_and_port (struct nat64_db_s *db, ip4_address_t *addr, u16 port, u8 protocol)
void	nat64_set_hash (u32 bib_buckets, u32 bib_memory_size, u32 st_buckets, u32 st_memory_size)
	Set NAT64 hash tables configuration. More...
int	nat64_add_del_pool_addr (u32 thread_index, ip4_address_t *addr, u32 vrf_id, u8 is_add)
	Add/delete address to NAT64 pool. More...
void	nat64_pool_addr_walk (nat64_pool_addr_walk_fn_t fn, void *ctx)
	Walk NAT64 pool. More...
int	nat64_add_interface_address (u32 sw_if_index, int is_add)
	NAT64 pool address from specific (DHCP addressed) interface. More...
int	nat64_add_del_interface (u32 sw_if_index, u8 is_inside, u8 is_add)
	Enable/disable NAT64 feature on the interface. More...
void	nat64_interfaces_walk (nat64_interface_walk_fn_t fn, void *ctx)
	Walk NAT64 interfaces. More...
int	nat64_alloc_out_addr_and_port (u32 fib_index, snat_protocol_t proto, ip4_address_t *addr, u16 *port, u32 thread_index)
	Alloce IPv4 address and port pair from NAT64 pool. More...
static uword	nat64_static_bib_worker_fn (vlib_main_t *vm, vlib_node_runtime_t *rt, vlib_frame_t *f)
	Add/delete static BIB entry in worker thread. More...
int	nat64_add_del_static_bib_entry (ip6_address_t *in_addr, ip4_address_t *out_addr, u16 in_port, u16 out_port, u8 proto, u32 vrf_id, u8 is_add)
	Add/delete static NAT64 BIB entry. More...
int	nat64_set_udp_timeout (u32 timeout)
	Set UDP session timeout. More...
u32	nat64_get_udp_timeout (void)
	Get UDP session timeout. More...
int	nat64_set_icmp_timeout (u32 timeout)
	Set ICMP session timeout. More...
u32	nat64_get_icmp_timeout (void)
	Get ICMP session timeout. More...
int	nat64_set_tcp_timeouts (u32 trans, u32 est)
	Set TCP session timeouts. More...
u32	nat64_get_tcp_trans_timeout (void)
	Get TCP transitory timeout. More...
u32	nat64_get_tcp_est_timeout (void)
	Get TCP established timeout. More...
void	nat64_session_reset_timeout (nat64_db_st_entry_t *ste, vlib_main_t *vm)
	Reset NAT64 session timeout. More...
void	nat64_tcp_session_set_state (nat64_db_st_entry_t *ste, tcp_header_t *tcp, u8 is_ip6)
	Set NAT64 TCP session state. More...
int	nat64_add_del_prefix (ip6_address_t *prefix, u8 plen, u32 vrf_id, u8 is_add)
	Add/delete NAT64 prefix. More...
void	nat64_prefix_walk (nat64_prefix_walk_fn_t fn, void *ctx)
	Walk NAT64 prefixes. More...
void	nat64_compose_ip6 (ip6_address_t *ip6, ip4_address_t *ip4, u32 fib_index)
	Compose IPv4-embedded IPv6 addresses. More...
void	nat64_extract_ip4 (ip6_address_t *ip6, ip4_address_t *ip4, u32 fib_index)
	Extract IPv4 address from the IPv4-embedded IPv6 addresses. More...
static uword	nat64_expire_worker_walk_fn (vlib_main_t *vm, vlib_node_runtime_t *rt, vlib_frame_t *f)
	Per worker process checking expire time for NAT64 sessions. More...
static uword	nat64_expire_walk_fn (vlib_main_t *vm, vlib_node_runtime_t *rt, vlib_frame_t *f)
	Centralized process to drive per worker expire walk. More...

Variables
nat64_main_t	nat64_main
static u8	well_known_prefix []
static vlib_node_registration_t	nat64_static_bib_worker_node
	(constructor) VLIB_REGISTER_NODE (nat64_static_bib_worker_node) More...
static vlib_node_registration_t	nat64_expire_worker_walk_node
	(constructor) VLIB_REGISTER_NODE (nat64_expire_worker_walk_node) More...
static vlib_node_registration_t	nat64_expire_walk_node
	(constructor) VLIB_REGISTER_NODE (nat64_expire_walk_node) More...

Detailed Description

NAT64 implementation.

Definition in file nat64.c.

Function Documentation

int nat64_add_del_interface	(	u32	sw_if_index,
		u8	is_inside,
		u8	is_add
	)

Enable/disable NAT64 feature on the interface.

Parameters

sw_if_index	Index of the interface.
is_inside	1 if inside, 0 if outside.
is_add	1 if add, 0 if delete.

Returns

0 on success, non-zero value otherwise.

Definition at line 453 of file nat64.c.

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int nat64_add_del_pool_addr	(	u32	thread_index,
		ip4_address_t *	addr,
		u32	vrf_id,
		u8	is_add
	)

Add/delete address to NAT64 pool.

Parameters

thread_index	Thread index used by ipfix nat logging (not address per thread).
addr	IPv4 address.
vrf_id	VRF id of tenant, ~0 means independent of VRF.
is_add	1 if add, 0 if delete.

Returns

0 on success, non-zero value otherwise.

Definition at line 315 of file nat64.c.

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int nat64_add_del_prefix	(	ip6_address_t *	prefix,
		u8	plen,
		u32	vrf_id,
		u8	is_add
	)

Add/delete NAT64 prefix.

Parameters

prefix	NAT64 prefix.
plen	Prefix length.
vrf_id	VRF id of tenant.
is_add	1 if add, 0 if delete.

Returns

0 on success, non-zero value otherwise.

Definition at line 1002 of file nat64.c.

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int nat64_add_del_static_bib_entry	(	ip6_address_t *	in_addr,
		ip4_address_t *	out_addr,
		u16	in_port,
		u16	out_port,
		u8	proto,
		u32	vrf_id,
		u8	is_add
	)

Add/delete static NAT64 BIB entry.

Parameters

in_addr	Inside IPv6 address.
out_addr	Outside IPv4 address.
in_port	Inside port number.
out_port	Outside port number.
proto	L4 protocol.
vrf_id	VRF id of tenant.
is_add	1 if add, 0 if delete.

Returns

0 on success, non-zero value otherwise.

Definition at line 684 of file nat64.c.

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int nat64_add_interface_address	(	u32	sw_if_index,
		int	is_add
	)

NAT64 pool address from specific (DHCP addressed) interface.

Parameters

sw_if_index	Index of the interface.
is_add	1 if add, 0 if delete.

Returns

0 on success, non-zero value otherwise.

Definition at line 411 of file nat64.c.

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int nat64_alloc_out_addr_and_port	(	u32	fib_index,
		snat_protocol_t	proto,
		ip4_address_t *	addr,
		u16 *	port,
		u32	thread_index
	)

Alloce IPv4 address and port pair from NAT64 pool.

Parameters

fib_index	FIB index of tenant.
proto	L4 protocol.
addr	Allocated IPv4 address.
port	Allocated port number.
thread_index	Thread index.

Returns

0 on success, non-zero value otherwise.

Definition at line 552 of file nat64.c.

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void nat64_compose_ip6	(	ip6_address_t *	ip6,
		ip4_address_t *	ip4,
		u32	fib_index
	)

Compose IPv4-embedded IPv6 addresses.

Parameters

ip6	IPv4-embedded IPv6 addresses.
ip4	IPv4 address.
fib_index	Tenant FIB index.

Definition at line 1065 of file nat64.c.

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static uword nat64_expire_walk_fn ( vlib_main_t *  vm, vlib_node_runtime_t *  rt, vlib_frame_t *  f  )

static

Centralized process to drive per worker expire walk.

Definition at line 1239 of file nat64.c.

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static uword nat64_expire_worker_walk_fn ( vlib_main_t *  vm, vlib_node_runtime_t *  rt, vlib_frame_t *  f  )

static

Per worker process checking expire time for NAT64 sessions.

Definition at line 1205 of file nat64.c.

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void nat64_extract_ip4	(	ip6_address_t *	ip6,
		ip4_address_t *	ip4,
		u32	fib_index
	)

Extract IPv4 address from the IPv4-embedded IPv6 addresses.

Parameters

ip6	IPv4-embedded IPv6 addresses.
ip4	IPv4 address.
fib_index	Tenant FIB index.

Definition at line 1135 of file nat64.c.

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static void nat64_free_out_addr_and_port ( struct nat64_db_s *  db, ip4_address_t *  addr, u16  port, u8  protocol  )

static

Definition at line 581 of file nat64.c.

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u32 nat64_get_icmp_timeout

(

void

)

Get ICMP session timeout.

Returns

ICMP session timeout in seconds.

Definition at line 854 of file nat64.c.

u32 nat64_get_tcp_est_timeout

(

void

)

Get TCP established timeout.

Returns

TCP established timeout in seconds.

Definition at line 888 of file nat64.c.

u32 nat64_get_tcp_trans_timeout

(

void

)

Get TCP transitory timeout.

Returns

TCP transitory timeout in seconds.

Definition at line 880 of file nat64.c.

u32 nat64_get_udp_timeout

(

void

)

Get UDP session timeout.

Returns

UDP session timeout in seconds.

Definition at line 833 of file nat64.c.

u32 nat64_get_worker_in2out

(

ip6_address_t *

addr

)

Get worker thread index for NAT64 in2out.

Parameters

addr	IPv6 src address.

Returns

worker thread index.

Definition at line 100 of file nat64.c.

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u32 nat64_get_worker_out2in

(

ip4_header_t *

ip

)

Get worker thread index for NAT64 out2in.

Parameters

ip	IPv4 header.

Returns

worker thread index.

Definition at line 123 of file nat64.c.

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clib_error_t* nat64_init

(

vlib_main_t *

vm

)

Initialize NAT64.

Parameters

vm	vlib main.

Returns

error code.

Definition at line 229 of file nat64.c.

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void nat64_interfaces_walk	(	nat64_interface_walk_fn_t	fn,
		void *	ctx
	)

Walk NAT64 interfaces.

Parameters

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

Definition at line 537 of file nat64.c.

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static void nat64_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 65 of file nat64.c.

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void nat64_pool_addr_walk	(	nat64_pool_addr_walk_fn_t	fn,
		void *	ctx
	)

Walk NAT64 pool.

Parameters

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

Definition at line 396 of file nat64.c.

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void nat64_prefix_walk	(	nat64_prefix_walk_fn_t	fn,
		void *	ctx
	)

Walk NAT64 prefixes.

Parameters

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

Definition at line 1050 of file nat64.c.

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void nat64_session_reset_timeout	(	nat64_db_st_entry_t *	ste,
		vlib_main_t *	vm
	)

Reset NAT64 session timeout.

Parameters

ste	Session table entry.
vm	VLIB main.

Definition at line 896 of file nat64.c.

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void nat64_set_hash	(	u32	bib_buckets,
		u32	bib_memory_size,
		u32	st_buckets,
		u32	st_memory_size
	)

Set NAT64 hash tables configuration.

Parameters

bib_buckets	Number of BIB hash buckets.
bib_memory_size	Memory size of BIB hash.
st_buckets	Number of session table hash buckets.
st_memory_size	Memory size of session table hash.

Definition at line 293 of file nat64.c.

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int nat64_set_icmp_timeout

(

u32

timeout

)

Set ICMP session timeout.

Parameters

timeout

Timeout value in seconds (if 0 reset to default value 60sec).

Returns

0 on success, non-zero value otherwise.

Definition at line 841 of file nat64.c.

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int nat64_set_tcp_timeouts	(	u32	trans,
		u32	est
	)

Set TCP session timeouts.

Parameters

trans	Transitory timeout in seconds (if 0 reset to default value 240sec).
est	Established timeout in seconds (if 0 reset to default value 7440sec).

Returns

0 on success, non-zero value otherwise.

Definition at line 862 of file nat64.c.

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int nat64_set_udp_timeout

(

u32

timeout

)

Set UDP session timeout.

Parameters

timeout

Timeout value in seconds (if 0 reset to default value 300sec).

Returns

0 on success, non-zero value otherwise.

Definition at line 820 of file nat64.c.

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static uword nat64_static_bib_worker_fn ( vlib_main_t *  vm, vlib_node_runtime_t *  rt, vlib_frame_t *  f  )

static

Add/delete static BIB entry in worker thread.

Definition at line 620 of file nat64.c.

void nat64_tcp_session_set_state	(	nat64_db_st_entry_t *	ste,
		tcp_header_t *	tcp,
		u8	is_ip6
	)

Set NAT64 TCP session state.

Parameters

ste	Session table entry.
tcp	TCP header.
is_ip6	1 if IPv6 packet, 0 if IPv4.

Definition at line 935 of file nat64.c.

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VNET_FEATURE_INIT	(	nat64_in2out	,
		static
	)

VNET_FEATURE_INIT	(	nat64_out2in	,
		static
	)

VNET_FEATURE_INIT	(	nat64_in2out_handoff	,
		static
	)

VNET_FEATURE_INIT	(	nat64_out2in_handoff	,
		static
	)

Variable Documentation

static vlib_node_registration_t nat64_expire_walk_node

static

Initial value:

= {
    .function = nat64_expire_walk_fn,
    .type = VLIB_NODE_TYPE_PROCESS,
    .name = "nat64-expire-walk",
}

(constructor) VLIB_REGISTER_NODE (nat64_expire_walk_node)

Definition at line 1233 of file nat64.c.

static vlib_node_registration_t nat64_expire_worker_walk_node

static

Initial value:

= {
    .function = nat64_expire_worker_walk_fn,
    .type = VLIB_NODE_TYPE_INPUT,
    .state = VLIB_NODE_STATE_INTERRUPT,
    .name = "nat64-expire-worker-walk",
}

(constructor) VLIB_REGISTER_NODE (nat64_expire_worker_walk_node)

Definition at line 1222 of file nat64.c.

nat64_main_t nat64_main

Definition at line 28 of file nat64.c.

static vlib_node_registration_t nat64_static_bib_worker_node

static

Initial value:

= {
    .function = nat64_static_bib_worker_fn,
    .type = VLIB_NODE_TYPE_INPUT,
    .state = VLIB_NODE_STATE_INTERRUPT,
    .name = "nat64-static-bib-worker",
}

(constructor) VLIB_REGISTER_NODE (nat64_static_bib_worker_node)

Definition at line 672 of file nat64.c.

u8 well_known_prefix[]

static

Initial value:

= {
  0x00, 0x64, 0xff, 0x9b,
  0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00
}

Definition at line 55 of file nat64.c.