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_set_fn_t) (ip6_header_t *ip6, ip4_header_t *ip4, void *ctx)
	IPv6 to IPv4 set call back function type. More...

Functions
static_always_inline int	ip6_parse (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 (ip6_header_t *ip6, u8 sender, u16 buffer_len)
	Get TCP/UDP 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 (const ip6_header_t *ip6)
	Translate TOS value from IPv6 to IPv4. More...
static int	icmp6_to_icmp (vlib_buffer_t *p, ip6_to_ip4_set_fn_t fn, void *ctx, ip6_to_ip4_set_fn_t inner_fn, void *inner_ctx)
	Translate ICMP6 packet to ICMP4. More...
static int	ip6_to_ip4_fragmented (vlib_buffer_t *p, ip6_to_ip4_set_fn_t fn, void *ctx)
	Translate IPv6 fragmented packet to IPv4. More...
static int	ip6_to_ip4_tcp_udp (vlib_buffer_t *p, ip6_to_ip4_set_fn_t fn, void *ctx, u8 udp_checksum)
	Translate IPv6 UDP/TCP packet to IPv4. More...
static int	ip6_to_ip4 (vlib_buffer_t *p, ip6_to_ip4_set_fn_t fn, void *ctx)
	Translate IPv6 packet to IPv4 (IP header only). 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 45 of file ip6_to_ip4.h.

Typedef Documentation

ip6_to_ip4_set_fn_t

typedef int(* ip6_to_ip4_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.

Function Documentation

icmp6_to_icmp()

static int icmp6_to_icmp ( vlib_buffer_t *  p, ip6_to_ip4_set_fn_t  fn, void *  ctx, ip6_to_ip4_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 249 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 136 of file ip6_to_ip4.h.

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ip6_get_port()

static u16 ip6_get_port ( ip6_header_t *  ip6, u8  sender, u16  buffer_len  )

inlinestatic

Get TCP/UDP port number or ICMP id from IPv6 packet.

Parameters

ip6	IPv6 header.
sender	1 get sender port, 0 get receiver port.
buffer_len	Buffer length.

Returns

Port number on success, 0 otherwise.

Definition at line 90 of file ip6_to_ip4.h.

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ip6_parse()

static_always_inline int ip6_parse	(	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

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 59 of file ip6_to_ip4.h.

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ip6_to_ip4()

static int ip6_to_ip4 ( vlib_buffer_t *  p, ip6_to_ip4_set_fn_t  fn, void *  ctx  )

inlinestatic

Translate IPv6 packet to IPv4 (IP header only).

Parameters

p	Buffer to translate.
fn	The function to translate header.
ctx	A context passed in the header translate function.

Returns

0 on success, non-zero value otherwise.

Definition at line 578 of file ip6_to_ip4.h.

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ip6_to_ip4_fragmented()

static int ip6_to_ip4_fragmented ( vlib_buffer_t *  p, ip6_to_ip4_set_fn_t  fn, void *  ctx  )

inlinestatic

Translate IPv6 fragmented packet to IPv4.

Parameters

p	Buffer to translate.
fn	The function to translate header.
ctx	A context passed in the header translate function.

Returns

0 on success, non-zero value otherwise.

Definition at line 425 of file ip6_to_ip4.h.

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ip6_to_ip4_tcp_udp()

static int ip6_to_ip4_tcp_udp ( vlib_buffer_t *  p, ip6_to_ip4_set_fn_t  fn, void *  ctx, u8  udp_checksum  )

inlinestatic

Translate IPv6 UDP/TCP packet to IPv4.

Parameters

p	Buffer to translate.
fn	The function to translate header.
ctx	A context passed in the header translate function.

Returns

0 on success, non-zero value otherwise.

Definition at line 481 of file ip6_to_ip4.h.

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ip6_translate_tos()

static_always_inline u8 ip6_translate_tos

(

const ip6_header_t *

ip6

)

Translate TOS value from IPv6 to IPv4.

Parameters

ip6	IPv6 header.

Returns

IPv4 TOS value.

Definition at line 231 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 31 of file ip6_to_ip4.h.