ip4_input.c File Reference

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Data Structures
struct	ip4_input_trace_t

Functions
static u8 *	format_ip4_input_trace (u8 *s, va_list *va)
static_always_inline u32	ip4_input_set_next (u32 sw_if_index, vlib_buffer_t *b, int arc_enabled)
static_always_inline void	ip4_input_check_sw_if_index (vlib_main_t *vm, vlib_simple_counter_main_t *cm, u32 sw_if_index, u32 *last_sw_if_index, u32 *cnt, int *arc_enabled)
static uword	ip4_input_inline (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame, int verify_checksum)
VLIB_NODE_FN()	ip4_input_node (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
	IPv4 input node. More...
VLIB_NODE_FN()	ip4_input_no_checksum_node (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
static clib_error_t *	ip4_init (vlib_main_t *vm)

Variables
char *	ip4_error_strings []
vlib_node_registration_t	ip4_input_node
	(constructor) VLIB_REGISTER_NODE (ip4_input_node) More...
vlib_node_registration_t	ip4_input_no_checksum_node
	(constructor) VLIB_REGISTER_NODE (ip4_input_no_checksum_node) More...

Function Documentation

static u8* format_ip4_input_trace ( u8 *  s, va_list *  va  )

static

Definition at line 52 of file ip4_input.c.

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static clib_error_t* ip4_init ( vlib_main_t *  vm )

static

Definition at line 350 of file ip4_input.c.

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static_always_inline void ip4_input_check_sw_if_index	(	vlib_main_t *	vm,
		vlib_simple_counter_main_t *	cm,
		u32	sw_if_index,
		u32 *	last_sw_if_index,
		u32 *	cnt,
		int *	arc_enabled
	)

Definition at line 93 of file ip4_input.c.

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static uword ip4_input_inline ( vlib_main_t *  vm, vlib_node_runtime_t *  node, vlib_frame_t *  frame, int  verify_checksum  )

inlinestatic

Definition at line 123 of file ip4_input.c.

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VLIB_NODE_FN() ip4_input_no_checksum_node	(	vlib_main_t *	vm,
		vlib_node_runtime_t *	node,
		vlib_frame_t *	frame
	)

Definition at line 302 of file ip4_input.c.

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VLIB_NODE_FN() ip4_input_node	(	vlib_main_t *	vm,
		vlib_node_runtime_t *	node,
		vlib_frame_t *	frame
	)

IPv4 input node.

Node Identifier:

ip4-input

This is the IPv4 input node: validates ip4 header checksums, verifies ip header lengths, discards pkts with expired TTLs, and sends pkts to the set of ip feature nodes configured on the rx interface.

Parameters

vm	vlib_main_t corresponding to the current thread
node	vlib_node_runtime_t
frame	vlib_frame_t whose contents should be dispatched

Graph mechanics: buffer metadata, next index usage

Uses:

• vnet_feature_config_main_t cm corresponding to each pkt's dst address unicast / multicast status.
• b->current_config_index corresponding to each pkt's rx sw_if_index.
  • This sets the per-packet graph trajectory, ensuring that each packet visits the per-interface features in order.
• vnet_buffer(b)->sw_if_index[VLIB_RX]
  • Indicates the sw_if_index value of the interface that the packet was received on.

Sets:

• vnet_buffer(b)->ip.adj_index[VLIB_TX]
  • The lookup result adjacency index.

Next Indices:

• Dispatches pkts to the (first) feature node: vnet_get_config_data (... &next0 ...); or error-drop

Definition at line 296 of file ip4_input.c.

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static_always_inline u32 ip4_input_set_next	(	u32	sw_if_index,
		vlib_buffer_t *	b,
		int	arc_enabled
	)

Definition at line 66 of file ip4_input.c.

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Variable Documentation

char* ip4_error_strings[]

Initial value:

= {
#define _(sym,string) 
  foreach_ip4_error

}

Definition at line 310 of file ip4_input.c.

vlib_node_registration_t ip4_input_no_checksum_node

Initial value:

= {
  .name = "ip4-input-no-checksum",
  .vector_size = sizeof (u32),

  .sibling_of = "ip4-input",
  .format_buffer = format_ip4_header,
  .format_trace = format_ip4_input_trace,
}

(constructor) VLIB_REGISTER_NODE (ip4_input_no_checksum_node)

Definition at line 339 of file ip4_input.c.

vlib_node_registration_t ip4_input_node

Initial value:

= {
  .name = "ip4-input",
  .vector_size = sizeof (u32),

  .n_errors = IP4_N_ERROR,
  .error_strings = ip4_error_strings,

  .n_next_nodes = IP4_INPUT_N_NEXT,
  .next_nodes = {
    [IP4_INPUT_NEXT_DROP] = "error-drop",
    [IP4_INPUT_NEXT_PUNT] = "error-punt",
    [IP4_INPUT_NEXT_OPTIONS] = "ip4-options",
    [IP4_INPUT_NEXT_LOOKUP] = "ip4-lookup",
    [IP4_INPUT_NEXT_LOOKUP_MULTICAST] = "ip4-mfib-forward-lookup",
    [IP4_INPUT_NEXT_ICMP_ERROR] = "ip4-icmp-error",
    [IP4_INPUT_NEXT_REASSEMBLY] = "ip4-reassembly",
  },

  .format_buffer = format_ip4_header,
  .format_trace = format_ip4_input_trace,
}

(constructor) VLIB_REGISTER_NODE (ip4_input_node)

Global ip4 input node.

Definition at line 317 of file ip4_input.c.