Minimal fragment forwarding

Provides minimal fragment forwarding using the VRB. More...

Detailed Description

Provides minimal fragment forwarding using the VRB.

See also

RFC 8930

Virtual reassembly buffer

Warning

This feature is experimental!

Files
file	minfwd.h
	Minimal fragment forwarding definitions.

Functions
int	gnrc_sixlowpan_frag_minfwd_forward (gnrc_pktsnip_t *pkt, const sixlowpan_frag_n_t *frag, gnrc_sixlowpan_frag_vrb_t *vrbe, unsigned page)
	Forwards a fragment according to a VRB entry.
int	gnrc_sixlowpan_frag_minfwd_frag_iphc (gnrc_pktsnip_t *pkt, size_t orig_datagram_size, const ipv6_addr_t *ipv6_addr, gnrc_sixlowpan_frag_fb_t *fbuf)
	Fragments a packet with just the IPHC (and padding payload to get to 8 byte) as the first fragment.

Function Documentation

gnrc_sixlowpan_frag_minfwd_forward()

int gnrc_sixlowpan_frag_minfwd_forward	(	gnrc_pktsnip_t *	pkt,
		const sixlowpan_frag_n_t *	frag,
		gnrc_sixlowpan_frag_vrb_t *	vrbe,
		unsigned	page
	)

Forwards a fragment according to a VRB entry.

Parameters

[in]	pkt	The fragment to forward (without fragmentation header). Is consumed by this function.
[in]	frag	The originally received fragmentation header.
[in]	vrbe	Virtual reassembly buffer containing the forwarding information. Removed when datagram was completely forwarded.
[in]	page	Current 6Lo dispatch parsing page.

Precondition

vrbe != NULL

pkt != NULL

frag != NULL

Returns

0 on success.

-ENOMEM, when packet buffer is too full to prepare packet for forwarding.

gnrc_sixlowpan_frag_minfwd_frag_iphc()

int gnrc_sixlowpan_frag_minfwd_frag_iphc	(	gnrc_pktsnip_t *	pkt,
		size_t	orig_datagram_size,
		const ipv6_addr_t *	ipv6_addr,
		gnrc_sixlowpan_frag_fb_t *	fbuf
	)

Fragments a packet with just the IPHC (and padding payload to get to 8 byte) as the first fragment.

Precondition

(frag_msg != NULL)

(pkt != NULL) && (pkt->type == GNRC_NETTYPE_NETIF)

(pkt->next != NULL) && (pkt->next->type == GNRC_NETTYPE_SIXLOWPAN)

Parameters

[in]	pkt	The compressed packet to be sent. Must be in send order with a packet snip of type GNRC_NETTYPE_NETIF first, GNRC_NETTYPE_SIXLOWPAN (the IPHC header including NHC) second, and 0 or more snips of payload.
[in]	orig_datagram_size	The size of the pkt before compression (without GNRC_NETTYPE_NETIF snip). This can differ from frag_msg's gnrc_sixlowpan_msg_frag_t::datagram_size as it might just be a fragment in forwarding that is re-compressed in pkt.
[in]	ipv6_addr	The (uncompressed) destination address of pkt.
[in]	fbuf	A fragmentation buffer entry.

Returns

0, when fragmentation was successful

-1, on error. pkt is not released in that case and should be handled by normal fragmentation.