node.c File Reference

L2-GRE over IPSec packet processing. More...

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Data Structures
struct	ipsec_gre_rx_trace_t

Macros
#define	foreach_ipsec_gre_input_next
#define	ipsec_gre_error(n, s)   s,

Enumerations
enum	ipsec_gre_input_next_t { IPSEC_GRE_INPUT_N_NEXT }

Functions
u8 *	format_ipsec_gre_rx_trace (u8 *s, va_list *args)
static uword	ipsec_gre_input (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *from_frame)
	L2-GRE over IPSec input node. More...
static clib_error_t *	ipsec_gre_input_init (vlib_main_t *vm)

Variables
static char *	ipsec_gre_error_strings []
vlib_node_registration_t	ipsec_gre_input_node
	(constructor) VLIB_REGISTER_NODE (ipsec_gre_input_node) More...

Detailed Description

L2-GRE over IPSec packet processing.

Removes GRE header from the packet and sends it to the l2-input node.

Definition in file node.c.

Macro Definition Documentation

#define foreach_ipsec_gre_input_next

Value:

_(PUNT, "error-punt")                           \
_(DROP, "error-drop")                           \
_(L2_INPUT, "l2-input")

Definition at line 27 of file node.c.

#define ipsec_gre_error	(		n,
			s
	)		s,

Enumeration Type Documentation

enum ipsec_gre_input_next_t

Enumerator
IPSEC_GRE_INPUT_N_NEXT

Definition at line 32 of file node.c.

Function Documentation

u8* format_ipsec_gre_rx_trace	(	u8 *	s,
		va_list *	args
	)

Definition at line 46 of file node.c.

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static uword ipsec_gre_input ( vlib_main_t *  vm, vlib_node_runtime_t *  node, vlib_frame_t *  from_frame  )

static

L2-GRE over IPSec input node.

Node Identifier:

ipsec-gre-input

This node remove GRE header.

Parameters

vm	vlib_main_t corresponding to the current thread.
node	vlib_node_runtime_t data for this node.
from_frame	vlib_frame_t whose contents should be dispatched.

Graph mechanics: buffer metadata, next index usage

Uses:

• ip->src_address and ip->dst_address
  • Match tunnel by source and destination addresses in GRE IP header.

Sets:

• vnet_buffer(b)->gre.src
  • Save tunnel source IPv4 address.
• vnet_buffer(b)->gre.dst
  • Save tunnel destination IPv4 address.
• vnet_buffer(b)->sw_if_index[VLIB_RX]
  • Set input sw_if_index to IPSec-GRE tunnel for learning.

Next Index:

• Dispatches the packet to the l2-input node.

Definition at line 87 of file node.c.

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static clib_error_t* ipsec_gre_input_init ( vlib_main_t *  vm )

static

Definition at line 421 of file node.c.

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Variable Documentation

char* ipsec_gre_error_strings[]

static

Initial value:

= {
#define ipsec_gre_error(n,s) 




ipsec_gre_error (NONE, "no error")
ipsec_gre_error (UNKNOWN_PROTOCOL, "unknown protocol")
ipsec_gre_error (UNSUPPORTED_VERSION, "unsupported version")
ipsec_gre_error (PKTS_DECAP, "GRE input packets decapsulated")
ipsec_gre_error (PKTS_ENCAP, "GRE output packets encapsulated")
ipsec_gre_error (NO_SUCH_TUNNEL, "GRE input packets dropped due to missing tunnel")

}

Definition at line 394 of file node.c.

vlib_node_registration_t ipsec_gre_input_node

Initial value:

= {
  .function = ipsec_gre_input,
  .name = "ipsec-gre-input",
  
  .vector_size = sizeof (u32),

  .n_errors = IPSEC_GRE_N_ERROR,
  .error_strings = ipsec_gre_error_strings,

  .n_next_nodes = IPSEC_GRE_INPUT_N_NEXT,
  .next_nodes = {
#define _(s,n) 
    foreach_ipsec_gre_input_next

  },

  .format_trace = format_ipsec_gre_rx_trace,
}

(constructor) VLIB_REGISTER_NODE (ipsec_gre_input_node)

Definition at line 400 of file node.c.