l2_node.c File Reference

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Data Structures
struct	flowperpkt_l2_trace_t

Macros
#define	foreach_flowperpkt_l2_error

Enumerations
enum	flowperpkt_l2_error_t { FLOWPERPKT_N_ERROR }
enum	flowperpkt_l2_next_t { FLOWPERPKT_L2_NEXT_DROP, FLOWPERPKT_L2_NEXT_IP4_LOOKUP, FLOWPERPKT_L2_N_NEXT }

Functions
static u8 *	format_flowperpkt_l2_trace (u8 *s, va_list *args)
static void	add_to_flow_record_l2 (vlib_main_t *vm, vlib_node_runtime_t *node, flowperpkt_main_t *fm, u32 rx_sw_if_index, u32 tx_sw_if_index, u8 *src_mac, u8 *dst_mac, u16 ethertype, u64 timestamp, u16 length, int do_flush)
	add an entry to the flow record under construction More...
void	flowperpkt_flush_callback_l2 (void)
static uword	flowperpkt_l2_node_fn (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)

Variables
vlib_node_registration_t	flowperpkt_l2_node
	IPFIX l2 flow-per-packet graph node. More...
static char *	flowperpkt_l2_error_strings []

Macro Definition Documentation

#define foreach_flowperpkt_l2_error

Definition at line 63 of file l2_node.c.

Enumeration Type Documentation

enum flowperpkt_l2_error_t

Enumerator
FLOWPERPKT_N_ERROR

Definition at line 65 of file l2_node.c.

enum flowperpkt_l2_next_t

Enumerator
FLOWPERPKT_L2_NEXT_DROP
FLOWPERPKT_L2_NEXT_IP4_LOOKUP
FLOWPERPKT_L2_N_NEXT

Definition at line 79 of file l2_node.c.

Function Documentation

static void add_to_flow_record_l2 ( vlib_main_t *  vm, vlib_node_runtime_t *  node, flowperpkt_main_t *  fm, u32  rx_sw_if_index, u32  tx_sw_if_index, u8 *  src_mac, u8 *  dst_mac, u16  ethertype, u64  timestamp, u16  length, int  do_flush  )

inlinestatic

add an entry to the flow record under construction

Parameters

vm	vlib_main_t * current worker thread main structure pointer
fm	flowperpkt_main_t * flow-per-packet main structure pointer
sw_if_index	u32 interface handle
tos	u8 ToS bits from the packet
timestamp	u64 timestamp, nanoseconds since 1/1/70
length	u16 ip length of the packet
do_flush	int 1 = flush all cached records, 0 = construct a record

Definition at line 98 of file l2_node.c.

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void flowperpkt_flush_callback_l2

(

void

)

Definition at line 312 of file l2_node.c.

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static uword flowperpkt_l2_node_fn ( vlib_main_t *  vm, vlib_node_runtime_t *  node, vlib_frame_t *  frame  )

static

Definition at line 331 of file l2_node.c.

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static u8* format_flowperpkt_l2_trace ( u8 *  s, va_list *  args  )

static

Definition at line 45 of file l2_node.c.

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Variable Documentation

char* flowperpkt_l2_error_strings[]

static

Initial value:

= {
#define _(sym,string) 
  foreach_flowperpkt_l2_error

}

Definition at line 73 of file l2_node.c.

vlib_node_registration_t flowperpkt_l2_node

Initial value:

= {
  .function = flowperpkt_l2_node_fn,
  .name = "flowperpkt-l2",
  .vector_size = sizeof (u32),
  .format_trace = format_flowperpkt_l2_trace,
  .type = VLIB_NODE_TYPE_INTERNAL,

  .n_errors = ARRAY_LEN(flowperpkt_l2_error_strings),
  .error_strings = flowperpkt_l2_error_strings,

  .n_next_nodes = FLOWPERPKT_L2_N_NEXT,

  
  .next_nodes = {
    [FLOWPERPKT_L2_NEXT_DROP] = "error-drop",
    [FLOWPERPKT_L2_NEXT_IP4_LOOKUP] = "ip4-lookup",
  },
}

IPFIX l2 flow-per-packet graph node.

Node Identifier:

flowperpkt-l2

This is the IPFIX flow-record-per-packet node.

Parameters

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

Graph mechanics: buffer metadata, next index usage

Uses:

• vnet_buffer(b)->ip.save_rewrite_length
  • tells the node the length of the rewrite which was applied in ip4/6_rewrite_inline, allows the code to find the IP header without having to parse L2 headers, or make stupid assumptions about their length.
• vnet_buffer(b)->flags & VLIB_BUFFER_FLOW_REPORT
  • Used to suppress flow record generation for flow record packets.

Sets:

• vnet_buffer(b)->flags & VLIB_BUFFER_FLOW_REPORT
  • To suppress flow record generation for flow record packets

Next Index:

• Next configured output feature on the interface, usually "interface-output." Generated flow records head for ip4-lookup(constructor) VLIB_REGISTER_NODE (flowperpkt_l2_node)

Definition at line 60 of file l2_node.c.