ip4_input.c File Reference

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Data Structures
struct	ip4_input_trace_t

Enumerations
enum	ip4_input_next_t {   IP4_INPUT_NEXT_DROP, IP4_INPUT_NEXT_PUNT, IP4_INPUT_NEXT_LOOKUP, IP4_INPUT_NEXT_LOOKUP_MULTICAST,   IP4_INPUT_NEXT_ICMP_ERROR, IP4_INPUT_N_NEXT }

Functions
static u8 *	format_ip4_input_trace (u8 *s, va_list *va)
static uword	ip4_input_inline (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame, int verify_checksum)
static uword	ip4_input (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
	IPv4 input node. More...
static uword	ip4_input_no_checksum (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
static clib_error_t *	ip4_init (vlib_main_t *vm)

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

Enumeration Type Documentation

enum ip4_input_next_t

Enumerator
IP4_INPUT_NEXT_DROP
IP4_INPUT_NEXT_PUNT
IP4_INPUT_NEXT_LOOKUP
IP4_INPUT_NEXT_LOOKUP_MULTICAST
IP4_INPUT_NEXT_ICMP_ERROR
IP4_INPUT_N_NEXT

Definition at line 62 of file ip4_input.c.

Function Documentation

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

static

Definition at line 49 of file ip4_input.c.

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static clib_error_t* ip4_init ( vlib_main_t *  vm )

static

Definition at line 431 of file ip4_input.c.

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static uword ip4_input ( vlib_main_t *  vm, vlib_node_runtime_t *  node, vlib_frame_t *  frame  )

static

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:

• ip_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 367 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 74 of file ip4_input.c.

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static uword ip4_input_no_checksum ( vlib_main_t *  vm, vlib_node_runtime_t *  node, vlib_frame_t *  frame  )

static

Definition at line 375 of file ip4_input.c.

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Variable Documentation

char* ip4_error_strings[]

static

Initial value:

= {
#define _(sym,string) 
  foreach_ip4_error

}

Definition at line 382 of file ip4_input.c.

vlib_node_registration_t ip4_input_no_checksum_node

static

Initial value:

= {
  .function = ip4_input_no_checksum,
  .name = "ip4-input-no-checksum",
  .vector_size = sizeof (u32),

  .n_next_nodes = IP4_INPUT_N_NEXT,
  .next_nodes = {
    [IP4_INPUT_NEXT_DROP] = "error-drop",
    [IP4_INPUT_NEXT_PUNT] = "error-punt",
    [IP4_INPUT_NEXT_LOOKUP] = "ip4-lookup",
    [IP4_INPUT_NEXT_LOOKUP_MULTICAST] = "ip4-lookup-multicast",
    [IP4_INPUT_NEXT_ICMP_ERROR] = "ip4-icmp-error",
  },

  .format_buffer = format_ip4_header,
  .format_trace = format_ip4_input_trace,
}

(constructor) VLIB_REGISTER_NODE (ip4_input_no_checksum_node)

Definition at line 411 of file ip4_input.c.

vlib_node_registration_t ip4_input_node

Initial value:

= {
  .function = ip4_input,
  .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_LOOKUP] = "ip4-lookup",
    [IP4_INPUT_NEXT_LOOKUP_MULTICAST] = "ip4-lookup-multicast",
    [IP4_INPUT_NEXT_ICMP_ERROR] = "ip4-icmp-error",
  },

  .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 388 of file ip4_input.c.