ip6_to_ip4.h File Reference

IPv6 to IPv4 translation. More...

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Macros
#define	frag_id_6to4(id)   ((id) ^ ((id) >> 16))

Typedefs
typedef int(*	ip6_to_ip4_icmp_set_fn_t) (ip6_header_t *ip6, ip4_header_t *ip4, void *ctx)
	IPv6 to IPv4 set call back function type. More...
typedef int(*	ip6_to_ip4_tcp_udp_set_fn_t) (vlib_buffer_t *b, ip6_header_t *ip6, ip4_header_t *ip4, void *ctx)

Functions
static_always_inline int	ip6_parse (vlib_main_t *vm, vlib_buffer_t *b, const ip6_header_t *ip6, u32 buff_len, u8 *l4_protocol, u16 *l4_offset, u16 *frag_hdr_offset)
	Parse some useful information from IPv6 header. More...
static u16	ip6_get_port (vlib_main_t *vm, vlib_buffer_t *b, ip6_header_t *ip6, u16 buffer_len, u8 *ip_protocol, u16 *src_port, u16 *dst_port, u8 *icmp_type_or_tcp_flags, u32 *tcp_ack_number, u32 *tcp_seq_number)
	Get L4 information like port number or ICMP id from IPv6 packet. More...
static_always_inline int	icmp6_to_icmp_header (icmp46_header_t *icmp, ip6_header_t **inner_ip6)
	Convert type and code value from ICMP6 to ICMP4. More...
static_always_inline u8	ip6_translate_tos (u32 ip_version_traffic_class_and_flow_label)
	Translate TOS value from IPv6 to IPv4. More...
static int	icmp6_to_icmp (vlib_main_t *vm, vlib_buffer_t *p, ip6_to_ip4_icmp_set_fn_t fn, void *ctx, ip6_to_ip4_icmp_set_fn_t inner_fn, void *inner_ctx)
	Translate ICMP6 packet to ICMP4. More...

Variables
static u8	icmp6_to_icmp_updater_pointer_table []

Detailed Description

IPv6 to IPv4 translation.

Definition in file ip6_to_ip4.h.

Macro Definition Documentation

frag_id_6to4

#define frag_id_6to4

(

id

)

((id) ^ ((id) >> 16))

Definition at line 49 of file ip6_to_ip4.h.

Typedef Documentation

ip6_to_ip4_icmp_set_fn_t

typedef int(* ip6_to_ip4_icmp_set_fn_t) (ip6_header_t *ip6, ip4_header_t *ip4, void *ctx)

IPv6 to IPv4 set call back function type.

Definition at line 27 of file ip6_to_ip4.h.

ip6_to_ip4_tcp_udp_set_fn_t

typedef int(* ip6_to_ip4_tcp_udp_set_fn_t) (vlib_buffer_t *b, ip6_header_t *ip6, ip4_header_t *ip4, void *ctx)

Definition at line 30 of file ip6_to_ip4.h.

Function Documentation

icmp6_to_icmp()

static int icmp6_to_icmp ( vlib_main_t *  vm, vlib_buffer_t *  p, ip6_to_ip4_icmp_set_fn_t  fn, void *  ctx, ip6_to_ip4_icmp_set_fn_t  inner_fn, void *  inner_ctx  )

inlinestatic

Translate ICMP6 packet to ICMP4.

Parameters

p	Buffer to translate.
fn	The function to translate outer header.
ctx	A context passed in the outer header translate function.
inner_fn	The function to translate inner header.
inner_ctx	A context passed in the inner header translate function.

Returns

0 on success, non-zero value otherwise.

Definition at line 350 of file ip6_to_ip4.h.

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icmp6_to_icmp_header()

static_always_inline int icmp6_to_icmp_header	(	icmp46_header_t *	icmp,
		ip6_header_t **	inner_ip6
	)

Convert type and code value from ICMP6 to ICMP4.

Parameters

icmp	ICMP header.
inner_ip6	Inner IPv6 header if present, 0 otherwise.

Returns

0 on success, non-zero value otherwise.

Definition at line 237 of file ip6_to_ip4.h.

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ip6_get_port()

static u16 ip6_get_port ( vlib_main_t *  vm, vlib_buffer_t *  b, ip6_header_t *  ip6, u16  buffer_len, u8 *  ip_protocol, u16 *  src_port, u16 *  dst_port, u8 *  icmp_type_or_tcp_flags, u32 *  tcp_ack_number, u32 *  tcp_seq_number  )

inlinestatic

Get L4 information like port number or ICMP id from IPv6 packet.

Parameters

ip6	IPv6 header.
buffer_len	Buffer length.
ip_protocol	L4 protocol
src_port	L4 src port or icmp id
dst_post	L4 dst port or icmp id
icmp_type_or_tcp_flags	ICMP type or TCP flags, if applicable
tcp_ack_number	TCP ack number, if applicable
tcp_seq_number	TCP seq number, if applicable

Returns

1 on success, 0 otherwise.

Definition at line 117 of file ip6_to_ip4.h.

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ip6_parse()

static_always_inline int ip6_parse	(	vlib_main_t *	vm,
		vlib_buffer_t *	b,
		const ip6_header_t *	ip6,
		u32	buff_len,
		u8 *	l4_protocol,
		u16 *	l4_offset,
		u16 *	frag_hdr_offset
	)

Parse some useful information from IPv6 header.

Parameters

vm	vlib main
b	vlib buffer
ip6	IPv6 header.
buff_len	Buffer length.
l4_protocol	L4 protocol number.
l4_offset	L4 header offset.
frag_hdr_offset	Fragment header offset if present, 0 otherwise.

Returns

0 on success, non-zero value otherwise.

Definition at line 65 of file ip6_to_ip4.h.

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ip6_translate_tos()

static_always_inline u8 ip6_translate_tos

(

u32

ip_version_traffic_class_and_flow_label

)

Translate TOS value from IPv6 to IPv4.

Parameters

ip_version_traffic_class_and_flow_label

in network byte order

Returns

IPv4 TOS value.

Definition at line 332 of file ip6_to_ip4.h.

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Variable Documentation

icmp6_to_icmp_updater_pointer_table

u8 icmp6_to_icmp_updater_pointer_table[]

static

Initial value:

=
  { 0, 1, ~0, ~0,
    2, 2, 9, 8,
    12, 12, 12, 12,
    12, 12, 12, 12,
    12, 12, 12, 12,
    12, 12, 12, 12,
    24, 24, 24, 24,
    24, 24, 24, 24,
    24, 24, 24, 24,
    24, 24, 24, 24
  }

Definition at line 35 of file ip6_to_ip4.h.