arp.c File Reference

IPv4 ARP. More...

Include dependency graph for arp.c:

Go to the source code of this file.

Data Structures
struct	ethernet_arp_interface_t_
	Per-interface ARP configuration and state. More...
struct	ethernet_proxy_arp_t
struct	pending_resolution_t
struct	ethernet_arp_main_t
struct	vnet_arp_set_ip4_over_ethernet_rpc_args_t
struct	ethernet_arp_input_trace_t
struct	pg_ethernet_arp_header_t

Macros
#define	ETHERNET_ARP_ARGS_REMOVE   (1<<0)
#define	ETHERNET_ARP_ARGS_FLUSH   (1<<1)
#define	ETHERNET_ARP_ARGS_POPULATE   (1<<2)
#define	foreach_ethernet_arp_error

Typedefs
typedef struct ethernet_arp_interface_t_	ethernet_arp_interface_t
	Per-interface ARP configuration and state. More...

Enumerations
enum	arp_input_next_t { ARP_INPUT_NEXT_DROP, ARP_INPUT_NEXT_REPLY_TX, ARP_INPUT_N_NEXT }
enum	ethernet_arp_input_error_t { ETHERNET_ARP_N_ERROR }
enum	arp_term_next_t { ARP_TERM_NEXT_L2_OUTPUT, ARP_TERM_NEXT_DROP, ARP_TERM_N_NEXT }

Functions
void	vl_api_rpc_call_main_thread (void *fp, u8 *data, u32 data_length)
static void	set_ip4_over_ethernet_rpc_callback (vnet_arp_set_ip4_over_ethernet_rpc_args_t *a)
static u8 *	format_ethernet_arp_hardware_type (u8 *s, va_list *va)
static u8 *	format_ethernet_arp_opcode (u8 *s, va_list *va)
static uword	unformat_ethernet_arp_opcode_host_byte_order (unformat_input_t *input, va_list *args)
static uword	unformat_ethernet_arp_opcode_net_byte_order (unformat_input_t *input, va_list *args)
static u8 *	format_ethernet_arp_header (u8 *s, va_list *va)
u8 *	format_ethernet_arp_ip4_entry (u8 *s, va_list *va)
static u8 *	format_ethernet_arp_input_trace (u8 *s, va_list *va)
static u8 *	format_arp_term_input_trace (u8 *s, va_list *va)
static void	arp_nbr_probe (ip_adjacency_t *adj)
static void	arp_mk_complete (adj_index_t ai, ethernet_arp_ip4_entry_t *e)
static void	arp_mk_incomplete (adj_index_t ai)
static ethernet_arp_ip4_entry_t *	arp_entry_find (ethernet_arp_interface_t *eai, const ip4_address_t *addr)
static adj_walk_rc_t	arp_mk_complete_walk (adj_index_t ai, void *ctx)
static adj_walk_rc_t	arp_mk_incomplete_walk (adj_index_t ai, void *ctx)
void	arp_update_adjacency (vnet_main_t *vnm, u32 sw_if_index, u32 ai)
int	vnet_arp_set_ip4_over_ethernet_internal (vnet_main_t *vnm, vnet_arp_set_ip4_over_ethernet_rpc_args_t *args)
void	vnet_register_ip4_arp_resolution_event (vnet_main_t *vnm, void *address_arg, uword node_index, uword type_opaque, uword data)
int	vnet_add_del_ip4_arp_change_event (vnet_main_t *vnm, void *data_callback, u32 pid, void *address_arg, uword node_index, uword type_opaque, uword data, int is_add)
static void	unset_random_arp_entry (void)
static int	arp_unnumbered (vlib_buffer_t *p0, u32 input_sw_if_index, u32 conn_sw_if_index)
static u32	arp_learn (vnet_main_t *vnm, ethernet_arp_main_t *am, u32 sw_if_index, void *addr)
static uword	arp_input (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
static int	ip4_arp_entry_sort (void *a1, void *a2)
ethernet_arp_ip4_entry_t *	ip4_neighbor_entries (u32 sw_if_index)
static clib_error_t *	show_ip4_arp (vlib_main_t *vm, unformat_input_t *input, vlib_cli_command_t *cmd)
static void	pg_ethernet_arp_header_init (pg_ethernet_arp_header_t *p)
uword	unformat_pg_arp_header (unformat_input_t *input, va_list *args)
clib_error_t *	ip4_set_arp_limit (u32 arp_limit)
int	vnet_arp_unset_ip4_over_ethernet (vnet_main_t *vnm, u32 sw_if_index, void *a_arg)
	Control Plane hook to remove an ARP entry. More...
static int	vnet_arp_flush_ip4_over_ethernet (vnet_main_t *vnm, u32 sw_if_index, void *a_arg)
	Internally generated event to flush the ARP cache on an interface state change event. More...
static int	vnet_arp_populate_ip4_over_ethernet (vnet_main_t *vnm, u32 sw_if_index, void *a_arg)
	Internally generated event to populate the ARP cache on an interface state change event. More...
static void	arp_add_del_interface_address (ip4_main_t *im, uword opaque, u32 sw_if_index, ip4_address_t *address, u32 address_length, u32 if_address_index, u32 is_del)
static clib_error_t *	ethernet_arp_init (vlib_main_t *vm)
static void	arp_entry_free (ethernet_arp_interface_t *eai, ethernet_arp_ip4_entry_t *e)
static int	vnet_arp_unset_ip4_over_ethernet_internal (vnet_main_t *vnm, vnet_arp_set_ip4_over_ethernet_rpc_args_t *args)
static int	vnet_arp_flush_ip4_over_ethernet_internal (vnet_main_t *vnm, vnet_arp_set_ip4_over_ethernet_rpc_args_t *args)
static int	vnet_arp_populate_ip4_over_ethernet_internal (vnet_main_t *vnm, vnet_arp_set_ip4_over_ethernet_rpc_args_t *args)
static clib_error_t *	ethernet_arp_sw_interface_up_down (vnet_main_t *vnm, u32 sw_if_index, u32 flags)
	Invoked when the interface's admin state changes. More...
	VNET_SW_INTERFACE_ADMIN_UP_DOWN_FUNCTION (ethernet_arp_sw_interface_up_down)
static void	increment_ip4_and_mac_address (ethernet_arp_ip4_over_ethernet_address_t *a)
int	vnet_arp_set_ip4_over_ethernet (vnet_main_t *vnm, u32 sw_if_index, void *a_arg, int is_static, int is_no_fib_entry)
int	vnet_proxy_arp_add_del (ip4_address_t *lo_addr, ip4_address_t *hi_addr, u32 fib_index, int is_del)
int	vnet_proxy_arp_fib_reset (u32 fib_id)
static clib_error_t *	ip_arp_add_del_command_fn (vlib_main_t *vm, unformat_input_t *input, vlib_cli_command_t *cmd)
static clib_error_t *	set_int_proxy_arp_command_fn (vlib_main_t *vm, unformat_input_t *input, vlib_cli_command_t *cmd)
static uword	arp_term_l2bd (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
clib_error_t *	arp_term_init (vlib_main_t *vm)
void	change_arp_mac (u32 sw_if_index, ethernet_arp_ip4_entry_t *e)
void	ethernet_arp_change_mac (u32 sw_if_index)
static void	send_ip4_garp (vlib_main_t *vm, vnet_hw_interface_t *hi)
static uword	send_garp_na_process (vlib_main_t *vm, vlib_node_runtime_t *rt, vlib_frame_t *f)

Variables
static ethernet_arp_main_t	ethernet_arp_main
static const u8	vrrp_prefix [] = { 0x00, 0x00, 0x5E, 0x00, 0x01 }
u32	send_garp_na_process_node_index
static char *	ethernet_arp_error_strings []
static vlib_node_registration_t	arp_input_node
	(constructor) VLIB_REGISTER_NODE (arp_input_node) More...
static vlib_cli_command_t	show_ip4_arp_command
	(constructor) VLIB_CLI_COMMAND (show_ip4_arp_command) More...
static vlib_cli_command_t	ip_arp_add_del_command
	(constructor) VLIB_CLI_COMMAND (ip_arp_add_del_command) More...
static vlib_cli_command_t	set_int_proxy_enable_command
	(constructor) VLIB_CLI_COMMAND (set_int_proxy_enable_command) More...
u32	arp_term_next_node_index [32]
static vlib_node_registration_t	arp_term_l2bd_node
	(constructor) VLIB_REGISTER_NODE (arp_term_l2bd_node) More...
static vlib_node_registration_t	send_garp_na_proc_node
	(constructor) VLIB_REGISTER_NODE (send_garp_na_proc_node) More...

Detailed Description

IPv4 ARP.

This file contains code to manage the IPv4 ARP tables (IP Address to MAC Address lookup).

Definition in file arp.c.

Macro Definition Documentation

#define ETHERNET_ARP_ARGS_FLUSH   (1<<1)

Definition at line 107 of file arp.c.

#define ETHERNET_ARP_ARGS_POPULATE   (1<<2)

Definition at line 108 of file arp.c.

#define ETHERNET_ARP_ARGS_REMOVE   (1<<0)

Definition at line 106 of file arp.c.

#define foreach_ethernet_arp_error

Value:

_ (replies_sent, "ARP replies sent")                                    \
  _ (l2_type_not_ethernet, "L2 type not ethernet")                      \
  _ (l3_type_not_ip4, "L3 type not IP4")                                \
  _ (l3_src_address_not_local, "IP4 source address not local to subnet") \
  _ (l3_dst_address_not_local, "IP4 destination address not local to subnet") \
  _ (l3_src_address_is_local, "IP4 source address matches local interface") \
  _ (l3_src_address_learned, "ARP request IP4 source address learned")  \
  _ (replies_received, "ARP replies received")                          \
  _ (opcode_not_request, "ARP opcode not request")                      \
  _ (proxy_arp_replies_sent, "Proxy ARP replies sent")                  \
  _ (l2_address_mismatch, "ARP hw addr does not match L2 frame src addr") \
  _ (missing_interface_address, "ARP missing interface address") \
  _ (gratuitous_arp, "ARP probe or announcement dropped") \
  _ (interface_no_table, "Interface is not mapped to an IP table") \
  _ (interface_not_ip_enabled, "Interface is not IP enabled") \

Definition at line 778 of file arp.c.

Typedef Documentation

typedef struct ethernet_arp_interface_t_ ethernet_arp_interface_t

Per-interface ARP configuration and state.

Enumeration Type Documentation

enum arp_input_next_t

Enumerator
ARP_INPUT_NEXT_DROP
ARP_INPUT_NEXT_REPLY_TX
ARP_INPUT_N_NEXT

Definition at line 771 of file arp.c.

enum arp_term_next_t

Enumerator
ARP_TERM_NEXT_L2_OUTPUT
ARP_TERM_NEXT_DROP
ARP_TERM_N_NEXT

Definition at line 2094 of file arp.c.

enum ethernet_arp_input_error_t

Enumerator
ETHERNET_ARP_N_ERROR

Definition at line 795 of file arp.c.

Function Documentation

static void arp_add_del_interface_address ( ip4_main_t *  im, uword  opaque, u32  sw_if_index, ip4_address_t *  address, u32  address_length, u32  if_address_index, u32  is_del  )

static

Definition at line 1502 of file arp.c.

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static ethernet_arp_ip4_entry_t* arp_entry_find ( ethernet_arp_interface_t *  eai, const ip4_address_t *  addr  )

static

Definition at line 402 of file arp.c.

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static void arp_entry_free ( ethernet_arp_interface_t *  eai, ethernet_arp_ip4_entry_t *  e  )

static

Definition at line 1607 of file arp.c.

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

static

Definition at line 873 of file arp.c.

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static u32 arp_learn ( vnet_main_t *  vnm, ethernet_arp_main_t *  am, u32  sw_if_index, void *  addr  )

static

Definition at line 861 of file arp.c.

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static void arp_mk_complete ( adj_index_t  ai, ethernet_arp_ip4_entry_t *  e  )

static

Definition at line 378 of file arp.c.

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static adj_walk_rc_t arp_mk_complete_walk ( adj_index_t  ai, void *  ctx  )

static

Definition at line 421 of file arp.c.

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static void arp_mk_incomplete ( adj_index_t  ai )

static

Definition at line 388 of file arp.c.

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static adj_walk_rc_t arp_mk_incomplete_walk ( adj_index_t  ai, void *  ctx  )

static

Definition at line 431 of file arp.c.

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static void arp_nbr_probe ( ip_adjacency_t *  adj )

static

Definition at line 315 of file arp.c.

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clib_error_t* arp_term_init

(

vlib_main_t *

vm

)

Definition at line 2347 of file arp.c.

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static uword arp_term_l2bd ( vlib_main_t *  vm, vlib_node_runtime_t *  node, vlib_frame_t *  frame  )

static

Definition at line 2104 of file arp.c.

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static int arp_unnumbered ( vlib_buffer_t *  p0, u32  input_sw_if_index, u32  conn_sw_if_index  )

static

Definition at line 836 of file arp.c.

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void arp_update_adjacency	(	vnet_main_t *	vnm,
		u32	sw_if_index,
		u32	ai
	)

Definition at line 439 of file arp.c.

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void change_arp_mac	(	u32	sw_if_index,
		ethernet_arp_ip4_entry_t *	e
	)

Definition at line 2361 of file arp.c.

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void ethernet_arp_change_mac

(

u32

sw_if_index

)

Definition at line 2371 of file arp.c.

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static clib_error_t* ethernet_arp_init ( vlib_main_t *  vm )

static

Definition at line 1557 of file arp.c.

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static clib_error_t* ethernet_arp_sw_interface_up_down ( vnet_main_t *  vnm, u32  sw_if_index, u32  flags  )

static

Invoked when the interface's admin state changes.

Definition at line 1732 of file arp.c.

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

static

Definition at line 298 of file arp.c.

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

static

Definition at line 121 of file arp.c.

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

static

Definition at line 198 of file arp.c.

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

static

Definition at line 284 of file arp.c.

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u8* format_ethernet_arp_ip4_entry	(	u8 *	s,
		va_list *	va
	)

Definition at line 245 of file arp.c.

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

static

Definition at line 139 of file arp.c.

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static void increment_ip4_and_mac_address ( ethernet_arp_ip4_over_ethernet_address_t *  a )

static

Definition at line 1774 of file arp.c.

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static int ip4_arp_entry_sort ( void *  a1, void *  a2  )

static

Definition at line 1262 of file arp.c.

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ethernet_arp_ip4_entry_t* ip4_neighbor_entries

(

u32

sw_if_index

)

Definition at line 1277 of file arp.c.

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clib_error_t* ip4_set_arp_limit

(

u32

arp_limit

)

Definition at line 1424 of file arp.c.

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static clib_error_t* ip_arp_add_del_command_fn ( vlib_main_t *  vm, unformat_input_t *  input, vlib_cli_command_t *  cmd  )

static

Definition at line 1888 of file arp.c.

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static void pg_ethernet_arp_header_init ( pg_ethernet_arp_header_t *  p )

inlinestatic

Definition at line 1371 of file arp.c.

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static uword send_garp_na_process ( vlib_main_t *  vm, vlib_node_runtime_t *  rt, vlib_frame_t *  f  )

static

Definition at line 2431 of file arp.c.

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static void send_ip4_garp ( vlib_main_t *  vm, vnet_hw_interface_t *  hi  )

static

Definition at line 2385 of file arp.c.

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static clib_error_t* set_int_proxy_arp_command_fn ( vlib_main_t *  vm, unformat_input_t *  input, vlib_cli_command_t *  cmd  )

static

Definition at line 2024 of file arp.c.

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static void set_ip4_over_ethernet_rpc_callback ( vnet_arp_set_ip4_over_ethernet_rpc_args_t *  a )

static

Definition at line 1712 of file arp.c.

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static clib_error_t* show_ip4_arp ( vlib_main_t *  vm, unformat_input_t *  input, vlib_cli_command_t *  cmd  )

static

Definition at line 1296 of file arp.c.

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static uword unformat_ethernet_arp_opcode_host_byte_order ( unformat_input_t *  input, va_list *  args  )

static

Definition at line 157 of file arp.c.

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static uword unformat_ethernet_arp_opcode_net_byte_order ( unformat_input_t *  input, va_list *  args  )

static

Definition at line 185 of file arp.c.

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uword unformat_pg_arp_header	(	unformat_input_t *	input,
		va_list *	args
	)

Definition at line 1388 of file arp.c.

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static void unset_random_arp_entry ( void  )

static

Definition at line 805 of file arp.c.

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void vl_api_rpc_call_main_thread	(	void *	fp,
		u8 *	data,
		u32	data_length
	)

Definition at line 1328 of file memory_vlib.c.

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int vnet_add_del_ip4_arp_change_event	(	vnet_main_t *	vnm,
		void *	data_callback,
		u32	pid,
		void *	address_arg,
		uword	node_index,
		uword	type_opaque,
		uword	data,
		int	is_add
	)

Definition at line 706 of file arp.c.

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static int vnet_arp_flush_ip4_over_ethernet ( vnet_main_t *  vnm, u32  sw_if_index, void *  a_arg  )

static

Internally generated event to flush the ARP cache on an interface state change event.

A flush will remove dynamic ARP entries, and for statics remove the MAC address from the corresponding adjacencies.

Definition at line 1458 of file arp.c.

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static int vnet_arp_flush_ip4_over_ethernet_internal ( vnet_main_t *  vnm, vnet_arp_set_ip4_over_ethernet_rpc_args_t *  args  )

static

Definition at line 1658 of file arp.c.

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static int vnet_arp_populate_ip4_over_ethernet ( vnet_main_t *  vnm, u32  sw_if_index, void *  a_arg  )

static

Internally generated event to populate the ARP cache on an interface state change event.

For static entries this will re-source the adjacencies.

Parameters

sw_if_index

The interface on which the ARP entires are acted

Definition at line 1481 of file arp.c.

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static int vnet_arp_populate_ip4_over_ethernet_internal ( vnet_main_t *  vnm, vnet_arp_set_ip4_over_ethernet_rpc_args_t *  args  )

static

Definition at line 1691 of file arp.c.

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int vnet_arp_set_ip4_over_ethernet	(	vnet_main_t *	vnm,
		u32	sw_if_index,
		void *	a_arg,
		int	is_static,
		int	is_no_fib_entry
	)

Definition at line 1797 of file arp.c.

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int vnet_arp_set_ip4_over_ethernet_internal	(	vnet_main_t *	vnm,
		vnet_arp_set_ip4_over_ethernet_rpc_args_t *	args
	)

Definition at line 526 of file arp.c.

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int vnet_arp_unset_ip4_over_ethernet	(	vnet_main_t *	vnm,
		u32	sw_if_index,
		void *	a_arg
	)

Control Plane hook to remove an ARP entry.

Definition at line 1436 of file arp.c.

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static int vnet_arp_unset_ip4_over_ethernet_internal ( vnet_main_t *  vnm, vnet_arp_set_ip4_over_ethernet_rpc_args_t *  args  )

inlinestatic

Definition at line 1634 of file arp.c.

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int vnet_proxy_arp_add_del	(	ip4_address_t *	lo_addr,
		ip4_address_t *	hi_addr,
		u32	fib_index,
		int	is_del
	)

Definition at line 1816 of file arp.c.

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int vnet_proxy_arp_fib_reset

(

u32

fib_id

)

Definition at line 1857 of file arp.c.

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void vnet_register_ip4_arp_resolution_event	(	vnet_main_t *	vnm,
		void *	address_arg,
		uword	node_index,
		uword	type_opaque,
		uword	data
	)

Definition at line 675 of file arp.c.

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VNET_SW_INTERFACE_ADMIN_UP_DOWN_FUNCTION

(

ethernet_arp_sw_interface_up_down

)

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Variable Documentation

vlib_node_registration_t arp_input_node

static

Initial value:

=
{
  .function = arp_input,
  .name = "arp-input",
  .vector_size = sizeof (u32),
  .n_errors = ETHERNET_ARP_N_ERROR,
  .error_strings = ethernet_arp_error_strings,
  .n_next_nodes = ARP_INPUT_N_NEXT,
  .next_nodes = {
    [ARP_INPUT_NEXT_DROP] = "error-drop",
    [ARP_INPUT_NEXT_REPLY_TX] = "interface-output",
  },
  .format_buffer = format_ethernet_arp_header,
  .format_trace = format_ethernet_arp_input_trace,
}

(constructor) VLIB_REGISTER_NODE (arp_input_node)

Definition at line 1244 of file arp.c.

vlib_node_registration_t arp_term_l2bd_node

static

Initial value:

= {
  .function = arp_term_l2bd,
  .name = "arp-term-l2bd",
  .vector_size = sizeof (u32),
  .n_errors = ETHERNET_ARP_N_ERROR,
  .error_strings = ethernet_arp_error_strings,
  .n_next_nodes = ARP_TERM_N_NEXT,
  .next_nodes = {
    [ARP_TERM_NEXT_L2_OUTPUT] = "l2-output",
    [ARP_TERM_NEXT_DROP] = "error-drop",
  },
  .format_buffer = format_ethernet_arp_header,
  .format_trace = format_arp_term_input_trace,
}

(constructor) VLIB_REGISTER_NODE (arp_term_l2bd_node)

Definition at line 2330 of file arp.c.

u32 arp_term_next_node_index[32]

Definition at line 2101 of file arp.c.

char* ethernet_arp_error_strings[]

static

Initial value:

= {
#define _(sym,string) 
  foreach_ethernet_arp_error

}

Definition at line 1237 of file arp.c.

ethernet_arp_main_t ethernet_arp_main

static

Definition at line 97 of file arp.c.

vlib_cli_command_t ip_arp_add_del_command

static

Initial value:

= {
  .path = "set ip arp",
  .short_help =
  "set ip arp [del] <intfc> <ip-address> <mac-address> [static] [no-fib-entry] [count <count>] [fib-id <fib-id>] [proxy <lo-addr> - <hi-addr>]",
  .function = ip_arp_add_del_command_fn,
}

(constructor) VLIB_CLI_COMMAND (ip_arp_add_del_command)

Definition at line 2015 of file arp.c.

static vlib_node_registration_t send_garp_na_proc_node

static

Initial value:

= {
    .function = send_garp_na_process,
    .type = VLIB_NODE_TYPE_PROCESS,
    .name = "send-garp-na-process",
}

(constructor) VLIB_REGISTER_NODE (send_garp_na_proc_node)

Definition at line 2428 of file arp.c.

u32 send_garp_na_process_node_index

Definition at line 114 of file arp.c.

vlib_cli_command_t set_int_proxy_enable_command

static

Initial value:

= {
  .path = "set interface proxy-arp",
  .short_help =
  "set interface proxy-arp <intfc> [enable|disable]",
  .function = set_int_proxy_arp_command_fn,
}

(constructor) VLIB_CLI_COMMAND (set_int_proxy_enable_command)

Definition at line 2081 of file arp.c.

vlib_cli_command_t show_ip4_arp_command

static

Initial value:

= {
  .path = "show ip arp",
  .function = show_ip4_arp,
  .short_help = "show ip arp",
}

(constructor) VLIB_CLI_COMMAND (show_ip4_arp_command)

Definition at line 1351 of file arp.c.

const u8 vrrp_prefix[] = { 0x00, 0x00, 0x5E, 0x00, 0x01 }

static

Definition at line 111 of file arp.c.