adj_midchain.h File Reference

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Functions
void	adj_nbr_midchain_update_rewrite (adj_index_t adj_index, adj_midchain_fixup_t fixup, const void *fixup_data, adj_flags_t flags, u8 *rewrite)
	Midchain Adjacency sub-type. More...
void	adj_nbr_midchain_stack (adj_index_t adj_index, const dpo_id_t *dpo)
	[re]stack a midchain. More...
void	adj_nbr_midchain_stack_on_fib_entry (adj_index_t adj_index, fib_node_index_t fei, fib_forward_chain_type_t fct)
	[re]stack a midchain. More...
void	adj_nbr_midchain_unstack (adj_index_t adj_index)
	unstack a midchain. More...
int	adj_ndr_midchain_recursive_loop_detect (adj_index_t ai, fib_node_index_t **entry_indicies)
	descend the FIB graph looking for loops More...
void	adj_midchain_module_init (void)
	Module initialisation. More...
u8 *	format_adj_midchain (u8 *s, va_list *ap)
	Format a midchain adjacency. More...
void	adj_midchain_delegate_stack (adj_index_t ai, u32 fib_index, const fib_prefix_t *pfx)
	create/attach a midchain delegate and stack it on the prefix passed More...
void	adj_midchain_delegate_restack (adj_index_t ai)
	restack a midchain delegate More...
void	adj_midchain_delegate_unstack (adj_index_t ai)
	unstack a midchain delegate (this stacks it on a drop) More...

Function Documentation

void adj_midchain_delegate_restack

(

adj_index_t

ai

)

restack a midchain delegate

Definition at line 75 of file adj_midchain_delegate.c.

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void adj_midchain_delegate_stack	(	adj_index_t	ai,
		u32	fib_index,
		const fib_prefix_t *	pfx
	)

create/attach a midchain delegate and stack it on the prefix passed

Parameters

ai	- the index of the adjacency to stack
fib_index	- The FIB index of the prefix on which to stack
pfx	- The prefix on which to stack

Definition at line 100 of file adj_midchain_delegate.c.

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void adj_midchain_delegate_unstack

(

adj_index_t

ai

)

unstack a midchain delegate (this stacks it on a drop)

Definition at line 136 of file adj_midchain_delegate.c.

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void adj_midchain_module_init

(

void

)

Module initialisation.

Definition at line 777 of file adj_midchain.c.

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void adj_nbr_midchain_stack	(	adj_index_t	adj_index,
		const dpo_id_t *	next
	)

[re]stack a midchain.

'Stacking' is the act of forming parent-child relationships in the data-plane graph. Do NOT use this function to stack on a DPO type that might form a loop.

Parameters

adj_index	The index of the midchain to stack
dpo	The parent DPO to stack onto (i.e. become a child of).

[re]stack a midchain.

Definition at line 641 of file adj_midchain.c.

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void adj_nbr_midchain_stack_on_fib_entry	(	adj_index_t	adj_index,
		fib_node_index_t	fei,
		fib_forward_chain_type_t	fct
	)

[re]stack a midchain.

'Stacking' is the act of forming parent-child relationships in the data-plane graph. Since function performs recursive loop detection.

Parameters

adj_index	The index of the midchain to stack
fei	The FIB entry to stack on
fct	The chain type to use from the fib entry fowarding

Definition at line 570 of file adj_midchain.c.

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void adj_nbr_midchain_unstack

(

adj_index_t

adj_index

)

unstack a midchain.

This will break the chain between the midchain and the next graph section. This is a implemented as stack-on-drop

Parameters

adj_index

The index of the midchain to stack

unstack a midchain.

Unstack the adj. stack it on drop

Definition at line 538 of file adj_midchain.c.

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void adj_nbr_midchain_update_rewrite	(	adj_index_t	adj_index,
		adj_midchain_fixup_t	fixup,
		const void *	fixup_data,
		adj_flags_t	flags,
		u8 *	rewrite
	)

Midchain Adjacency sub-type.

These adjs represent an L3 peer on a tunnel interface. The tunnel's adjacency is thus not the end of the chain, and needs to stack on/link to another chain (or portion of the graph) to reach the tunnel's destination.

Convert an existing neighbour adjacency into a midchain

Parameters

adj_index	The index of the neighbour adjacency.
fixup	The function that will be invoked at paket switch time to 'fixup' the rewrite applied with necessary per-packet info (i.e. length, checksums).
fixup_data	Context data set by the caller that is provided as an argument in the fixup function.
flags	Flags controlling the adjacency behaviour
rewrite	The rewrite.

Midchain Adjacency sub-type.

Update the adjacency's rewrite string. A NULL string implies the rewrite is reset (i.e. when ARP/ND entry is gone). NB: the adj being updated may be handling traffic in the DP.

Definition at line 500 of file adj_midchain.c.

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int adj_ndr_midchain_recursive_loop_detect	(	adj_index_t	ai,
		fib_node_index_t **	entry_indicies
	)

descend the FIB graph looking for loops

Parameters

ai	The adj index to traverse
entry_indicies)	A pointer to a vector of FIB entries already visited.

Definition at line 659 of file adj_midchain.c.

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u8* format_adj_midchain	(	u8 *	s,
		va_list *	ap
	)

Format a midchain adjacency.

Definition at line 686 of file adj_midchain.c.

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