Virtual reassembly buffer

Virtual reassembly buffer. More...

Detailed Description

Virtual reassembly buffer.

Files
file	vrb.h
	Virtual reassembly buffer definitions.

Data Structures
struct	gnrc_sixlowpan_frag_vrb_t
	Representation of the virtual reassembly buffer entry. More...

Functions
gnrc_sixlowpan_frag_vrb_t *	gnrc_sixlowpan_frag_vrb_add (const gnrc_sixlowpan_frag_rb_base_t *base, gnrc_netif_t *out_netif, const uint8_t *out_dst, size_t out_dst_len)
	Adds a new reassembly buffer entry.
gnrc_sixlowpan_frag_vrb_t *	gnrc_sixlowpan_frag_vrb_from_route (const gnrc_sixlowpan_frag_rb_base_t *base, gnrc_netif_t *netif, const gnrc_pktsnip_t *hdr)
	Generate reassembly buffer from a header's forwarding information.
void	gnrc_sixlowpan_frag_vrb_gc (void)
	Checks timeouts and removes entries if necessary.
gnrc_sixlowpan_frag_vrb_t *	gnrc_sixlowpan_frag_vrb_get (const uint8_t *src, size_t src_len, unsigned src_tag)
	Gets a VRB entry.
gnrc_sixlowpan_frag_vrb_t *	gnrc_sixlowpan_frag_vrb_reverse (const gnrc_netif_t *netif, const uint8_t *src, size_t src_len, unsigned tag)
	Reverse VRB lookup.
static void	gnrc_sixlowpan_frag_vrb_rm (gnrc_sixlowpan_frag_vrb_t *vrb)
	Removes an entry from the VRB.
static bool	gnrc_sixlowpan_frag_vrb_entry_empty (gnrc_sixlowpan_frag_vrb_t *vrb)
	Determines if a VRB entry is empty.
void	gnrc_sixlowpan_frag_vrb_reset (void)
	Resets the VRB to a clean state.

Function Documentation

gnrc_sixlowpan_frag_vrb_add()

gnrc_sixlowpan_frag_vrb_t * gnrc_sixlowpan_frag_vrb_add	(	const gnrc_sixlowpan_frag_rb_base_t *	base,
		gnrc_netif_t *	out_netif,
		const uint8_t *	out_dst,
		size_t	out_dst_len
	)

Adds a new reassembly buffer entry.

Parameters

[in]	base	Base data of the datagram. Must not be NULL.
[in]	out_netif	Network interface that is out-going to out_dst.
[in]	out_dst	Link-layer destination address to which to forward fragments identified by base. Must not be NULL.
[in]	out_dst_len	Length of out_dst. Must be greater than 0.

Precondition

base != NULL

out_dst != NULL

out_dst_len > 0

Returns

A new VRB entry.

NULL, if VRB is full.

gnrc_sixlowpan_frag_vrb_entry_empty()

static bool gnrc_sixlowpan_frag_vrb_entry_empty ( gnrc_sixlowpan_frag_vrb_t *  vrb )

inlinestatic

Determines if a VRB entry is empty.

Parameters

[in]

vrb

A VRB entry

Returns

true, if vrb entry is empty.

false, if vrb entry is not empty.

Definition at line 165 of file vrb.h.

gnrc_sixlowpan_frag_vrb_from_route()

gnrc_sixlowpan_frag_vrb_t * gnrc_sixlowpan_frag_vrb_from_route	(	const gnrc_sixlowpan_frag_rb_base_t *	base,
		gnrc_netif_t *	netif,
		const gnrc_pktsnip_t *	hdr
	)

Generate reassembly buffer from a header's forwarding information.

Parameters

[in]	base	Base data of the datagram. Must not be NULL.
[in]	netif	Restrict route to this interface. May be NULL for any interface.
[in]	hdr	Header from which to take the forwarding information from (e.g. IPv6 header implies hdr->type == GNRC_NETTYPE_IPV6).

Precondition

base != NULL

(hdr != NULL) && (hdr->data != NULL) && (hdr->size > 0)

Returns

The VRB entry pointing to the next hop based on the forwarding information provided in hdr and present in the respective forwarding information base for hdr->type.

NULL, if VRB is full or if there is no route to destination in hdr.

gnrc_sixlowpan_frag_vrb_get()

gnrc_sixlowpan_frag_vrb_t * gnrc_sixlowpan_frag_vrb_get	(	const uint8_t *	src,
		size_t	src_len,
		unsigned	src_tag
	)

Gets a VRB entry.

Parameters

[in]	src	Link-layer source address of the original fragment.
[in]	src_len	Length of src.
[in]	src_tag	Tag of the original fragment.

Returns

The VRB entry identified by the given parameters.

NULL, if there is no entry in the VRB that could be identified by the given parameters.

gnrc_sixlowpan_frag_vrb_reset()

void gnrc_sixlowpan_frag_vrb_reset

(

void

)

Resets the VRB to a clean state.

Note

Only available when TEST_SUITES is defined

gnrc_sixlowpan_frag_vrb_reverse()

gnrc_sixlowpan_frag_vrb_t * gnrc_sixlowpan_frag_vrb_reverse	(	const gnrc_netif_t *	netif,
		const uint8_t *	src,
		size_t	src_len,
		unsigned	tag
	)

Reverse VRB lookup.

Parameters

[in]	netif	Network interface the reverse label-switched packet came over
[in]	src	Link-layer source address of reverse label-switched packet.
[in]	src_len	Length of src.
[in]	tag	Tag of the reverse label-switched packet.

Returns

The VRB entry with vrb->super.dst == src and vrb->out_tag == tag.

NULL, if there is no entry in the VRB that has these values.

gnrc_sixlowpan_frag_vrb_rm()

static void gnrc_sixlowpan_frag_vrb_rm ( gnrc_sixlowpan_frag_vrb_t *  vrb )

inlinestatic

Removes an entry from the VRB.

Parameters

[in]

vrb

A VRB entry

Definition at line 149 of file vrb.h.