src/plugins/nat/nat_ha_doc.md


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# Active-Passive NAT HA {#nat_ha_doc}

## Introduction

One NAT node actively manages traffic while the other is synchronized and ready to transition to the active state and takes over seamlessly and enforces the same NAT sessions when failure occur. Both nodes share the same configuration settings.

## Configuration

### NAT HA protocol
Session synchronization traffic is distributed through an IPv4 UDP connection. The active node sends NAT HA protocol events to passive node. To achieve reliable transfer NAT HA protocol uses acknowledgement with re-transmission. This require the passive node to respond with an acknowledgement message as it receives the data. The active node keeps a record of each packet it sends and maintains a timer from when the packet was sent. The active node re-transmits a packet if the timer expires before receiving the acknowledgement.

### Topology

The two NAT nodes have a dedicated link (interface GE0/0/3 on both) to synchronize NAT sessions using NAT HA protocol.

```
        +-----------------------+
        |    outside network    |
        +-----------------------+
         /                     \
        /                       \
       /                         \
      /                           \
     /                             \
+---------+                   +---------+
| GE0/0/1 | Active    Passive | GE0/0/1 |
|         |                   |         |
|  GE0/0/3|-------------------|GE0/0/3  |
|         |   sync network    |         |
| GE0/0/0 |                   | GE0/0/0 |
+---------+                   +---------+
     \                             /
      \                           /
       \                         /
        \                       /
         \                     /
        +-----------------------+
        |    inside network     |
        +-----------------------+
```

### Active node configuration

```
set interface ip address GigabitEthernet0/0/1 10.15.7.101/24
set interface ip address GigabitEthernet0/0/0 172.16.10.101/24
set interface ip address GigabitEthernet0/0/3 10.0.0.1/24
set interface state GigabitEthernet0/0/0 up
set interface state GigabitEthernet0/0/1 up
set interface state GigabitEthernet0/0/3 up
set interface nat44 in GigabitEthernet0/0/0 out GigabitEthernet0/0/1
nat44 add address 10.15.7.100
nat ha listener 10.0.0.1:1234
nat ha failover 10.0.0.2:2345
```

### Passive node configuration

```
set interface ip address GigabitEthernet0/0/1 10.15.7.102/24
set interface ip address GigabitEthernet0/0/0 172.16.10.102/24
set interface ip address GigabitEthernet0/0/3 10.0.0.2/24
set interface state GigabitEthernet0/0/0 up
set interface state GigabitEthernet0/0/1 up
set interface state GigabitEthernet0/0/3 up
set interface nat44 in GigabitEthernet0/0/0 out GigabitEthernet0/0/1
nat44 add address 10.15.7.100
nat ha listener 10.0.0.2:2345
```
/*
 * Copyright (c) 2015 Cisco and/or its affiliates.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at:
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/*
 * interface.h: VNET interfaces/sub-interfaces
 *
 * Copyright (c) 2008 Eliot Dresselhaus
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 *  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 *  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 *  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
 *  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 *  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 *  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

#ifndef included_vnet_interface_h
#define included_vnet_interface_h

#include <vlib/vlib.h>
#include <vppinfra/pcap.h>
#include <vnet/l3_types.h>
#include <vppinfra/lock.h>

struct vnet_main_t;
struct vnet_hw_interface_t;
struct vnet_sw_interface_t;
union ip46_address_t_;

typedef enum
{
  VNET_HW_INTERFACE_RX_MODE_UNKNOWN,
  VNET_HW_INTERFACE_RX_MODE_POLLING,
  VNET_HW_INTERFACE_RX_MODE_INTERRUPT,
  VNET_HW_INTERFACE_RX_MODE_ADAPTIVE,
  VNET_HW_INTERFACE_RX_MODE_DEFAULT,
  VNET_HW_INTERFACE_NUM_RX_MODES,
} vnet_hw_interface_rx_mode;

/* Interface up/down callback. */
typedef clib_error_t *(vnet_interface_function_t)
  (struct vnet_main_t * vnm, u32 if_index, u32 flags);

/* Sub-interface add/del callback. */
typedef clib_error_t *(vnet_subif_add_del_function_t)
  (struct vnet_main_t * vnm, u32 if_index,
   struct vnet_sw_interface_t * template, int is_add);

/* Interface set mac address callback. */
typedef clib_error_t *(vnet_interface_set_mac_address_function_t)
  (struct vnet_hw_interface_t * hi,
   const u8 * old_address, const u8 * new_address);

/* Interface add/del additional mac address callback */
typedef clib_error_t *(vnet_interface_add_del_mac_address_function_t)
  (struct vnet_hw_interface_t * hi, const u8 * address, u8 is_add);

/* Interface set rx mode callback. */
typedef clib_error_t *(vnet_interface_set_rx_mode_function_t)
  (struct vnet_main_t * vnm, u32 if_index, u32 queue_id,
   vnet_hw_interface_rx_mode mode);

/* Interface set l2 mode callback. */
typedef clib_error_t *(vnet_interface_set_l2_mode_function_t)
  (struct vnet_main_t * vnm, struct vnet_hw_interface_t * hi,
   i32 l2_if_adjust);

typedef enum
{
  VNET_FLOW_DEV_OP_ADD_FLOW,
  VNET_FLOW_DEV_OP_DEL_FLOW,
  VNET_FLOW_DEV_OP_GET_COUNTER,
  VNET_FLOW_DEV_OP_RESET_COUNTER,
} vnet_flow_dev_op_t;

/* Interface flow operations callback. */
typedef int (vnet_flow_dev_ops_function_t) (struct vnet_main_t * vnm,
					    vnet_flow_dev_op_t op,
					    u32 hw_if_index, u32 index,
					    uword * private_data);

typedef enum vnet_interface_function_priority_t_
{
  VNET_ITF_FUNC_PRIORITY_LOW,
  VNET_ITF_FUNC_PRIORITY_HIGH,
} vnet_interface_function_priority_t;
#define VNET_ITF_FUNC_N_PRIO ((vnet_interface_function_priority_t)VNET_ITF_FUNC_PRIORITY_HIGH+1)

typedef struct _vnet_interface_function_list_elt
{
  struct _vnet_interface_function_list_elt *next_interface_function;
  clib_error_t *(*fp) (struct vnet_main_t * vnm, u32 if_index, u32 flags);
} _vnet_interface_function_list_elt_t;

#ifndef CLIB_MARCH_VARIANT
#define _VNET_INTERFACE_FUNCTION_DECL_PRIO(f,tag,p)                    \
                                                                        \
static void __vnet_interface_function_init_##tag##_##f (void)           \
    __attribute__((__constructor__)) ;                                  \
                                                                        \
static void __vnet_interface_function_init_##tag##_##f (void)           \
{                                                                       \
 vnet_main_t * vnm = vnet_get_main();                                   \
 static _vnet_interface_function_list_elt_t init_function;              \
 init_function.next_interface_function = vnm->tag##_functions[p];       \
 vnm->tag##_functions[p] = &init_function;                              \
 init_function.fp = (void *) &f;                                        \
}                                                                       \
static void __vnet_interface_function_deinit_##tag##_##f (void)         \
    __attribute__((__destructor__)) ;                                   \
                                                                        \
static void __vnet_interface_function_deinit_##tag##_##f (void)         \
{                                                                       \
 vnet_main_t * vnm = vnet_get_main();                                   \
 _vnet_interface_function_list_elt_t *next;                             \
 if (vnm->tag##_functions[p]->fp == f)                                  \
    {                                                                   \
      vnm->tag##_functions[p] =                                         \
        vnm->tag##_functions[p]->next_interface_function;               \
      return;                                                           \
    }                                                                   \
  next = vnm->tag##_functions[p];                                       \
  while (next->next_interface_function)                                 \
    {                                                                   \
      if (next->next_interface_function->fp == f)                       \
        {                                                               \
          next->next_interface_function =                               \
            next->next_interface_function->next_interface_function;     \
          return;                                                       \
        }                                                               \
      next = next->next_interface_function;                             \
    }                                                                   \
}
#else
/* create unused pointer to silence compiler warnings and get whole
   function optimized out */
#define _VNET_INTERFACE_FUNCTION_DECL_PRIO(f,tag,p)                    \
static __clib_unused void * __clib_unused_##f = f;
#endif

#define _VNET_INTERFACE_FUNCTION_DECL(f,tag)                            \
  _VNET_INTERFACE_FUNCTION_DECL_PRIO(f,tag,VNET_ITF_FUNC_PRIORITY_LOW)

#define VNET_HW_INTERFACE_ADD_DEL_FUNCTION(f)			\
  _VNET_INTERFACE_FUNCTION_DECL(f,hw_interface_add_del)
#define VNET_HW_INTERFACE_LINK_UP_DOWN_FUNCTION(f)		\
  _VNET_INTERFACE_FUNCTION_DECL(f,hw_interface_link_up_down)
#define VNET_HW_INTERFACE_LINK_UP_DOWN_FUNCTION_PRIO(f,p)       \
  _VNET_INTERFACE_FUNCTION_DECL_PRIO(f,hw_interface_link_up_down,p)
#define VNET_SW_INTERFACE_MTU_CHANGE_FUNCTION(f)                \
  _VNET_INTERFACE_FUNCTION_DECL(f,sw_interface_mtu_change)
#define VNET_SW_INTERFACE_ADD_DEL_FUNCTION(f)			\
  _VNET_INTERFACE_FUNCTION_DECL(f,sw_interface_add_del)
#define VNET_SW_INTERFACE_ADMIN_UP_DOWN_FUNCTION(f)		\
  _VNET_INTERFACE_FUNCTION_DECL(f,sw_interface_admin_up_down)
#define VNET_SW_INTERFACE_ADMIN_UP_DOWN_FUNCTION_PRIO(f,p)     	\
  _VNET_INTERFACE_FUNCTION_DECL_PRIO(f,sw_interface_admin_up_down, p)

/**
 * Tunnel description parameters
 */
typedef int (*vnet_dev_class_ip_tunnel_desc_t) (u32 sw_if_index,
						union ip46_address_t_ * src,
						union ip46_address_t_ * dst,
						u8 * is_l2);

/* A class of hardware interface devices. */
typedef struct _vnet_device_class
{
  /* Index into main vector. */
  u32 index;

  /* Device name (e.g. "FOOBAR 1234a"). */
  char *name;

  /* Function to call when hardware interface is added/deleted. */
  vnet_interface_function_t *interface_add_del_function;

  /* Function to bring device administratively up/down. */
  vnet_interface_function_t *admin_up_down_function;

  /* Function to call when sub-interface is added/deleted */
  vnet_subif_add_del_function_t *subif_add_del_function;

  /* Function to call interface rx mode is changed */
  vnet_interface_set_rx_mode_function_t *rx_mode_change_function;

  /* Function to call interface l2 mode is changed */
  vnet_interface_set_l2_mode_function_t *set_l2_mode_function;

  /* Redistribute flag changes/existence of this interface class. */
  u32 redistribute;

  /* Transmit function. */
  vlib_node_function_t *tx_function;

  /* Transmit function candidate registration with priority */
  vlib_node_fn_registration_t *tx_fn_registrations;

  /* Error strings indexed by error code for this node. */
  char **tx_function_error_strings;

  /* Number of error codes used by this node. */
  u32 tx_function_n_errors;

  /* Renumber device name [only!] support, a control-plane kludge */
  int (*name_renumber) (struct vnet_hw_interface_t * hi,
			u32 new_dev_instance);

  /* Interface flow offload operations */
  vnet_flow_dev_ops_function_t *flow_ops_function;

  /* Format device instance as name. */
  format_function_t *format_device_name;

  /* Parse function for device name. */
  unformat_function_t *unformat_device_name;

  /* Format device verbosely for this class. */
  format_function_t *format_device;

  /* Trace buffer format for TX function. */
  format_function_t *format_tx_trace;

  /* Format flow offload entry */
  format_function_t *format_flow;

  vnet_dev_class_ip_tunnel_desc_t ip_tun_desc;

  /* Function to clear hardware counters for device. */
  void (*clear_counters) (u32 dev_class_instance);

    uword (*is_valid_class_for_interface) (struct vnet_main_t * vnm,
					   u32 hw_if_index,
					   u32 hw_class_index);

  /* Called when hardware class of an interface changes. */
  void (*hw_class_change) (struct vnet_main_t * vnm,
			   u32 hw_if_index, u32 new_hw_class_index);

  /* Called to redirect traffic from a specific interface instance */
  void (*rx_redirect_to_node) (struct vnet_main_t * vnm,
			       u32 hw_if_index, u32 node_index);

  /* Link-list of all device classes set up by constructors created below */
  struct _vnet_device_class *next_class_registration;

  /* Function to set mac address. */
  vnet_interface_set_mac_address_function_t *mac_addr_change_function;

  /* Function to add/delete additional MAC addresses */
  vnet_interface_add_del_mac_address_function_t *mac_addr_add_del_function;
} vnet_device_class_t;

#ifndef CLIB_MARCH_VARIANT
#define VNET_DEVICE_CLASS(x,...)                                        \
  __VA_ARGS__ vnet_device_class_t x;                                    \
static void __vnet_add_device_class_registration_##x (void)             \
    __attribute__((__constructor__)) ;                                  \
static void __vnet_add_device_class_registration_##x (void)             \
{                                                                       \
    vnet_main_t * vnm = vnet_get_main();                                \
    x.next_class_registration = vnm->device_class_registrations;        \
    vnm->device_class_registrations = &x;                               \
}                                                                       \
static void __vnet_rm_device_class_registration_##x (void)              \
    __attribute__((__destructor__)) ;                                   \
static void __vnet_rm_device_class_registration_##x (void)              \
{                                                                       \
    vnet_main_t * vnm = vnet_get_main();                                \
    VLIB_REMOVE_FROM_LINKED_LIST (vnm->device_class_registrations,      \
                                  &x, next_class_registration);         \
}                                                                       \
__VA_ARGS__ vnet_device_class_t x
#else
/* create unused pointer to silence compiler warnings and get whole
   function optimized out */
#define VNET_DEVICE_CLASS(x,...)                                        \
static __clib_unused vnet_device_class_t __clib_unused_##x
#endif

#define VNET_DEVICE_CLASS_TX_FN(devclass)				\
uword CLIB_MARCH_SFX (devclass##_tx_fn)();				\
static vlib_node_fn_registration_t					\
  CLIB_MARCH_SFX(devclass##_tx_fn_registration) =			\
  { .function = &CLIB_MARCH_SFX (devclass##_tx_fn), };			\
									\
static void __clib_constructor						\
CLIB_MARCH_SFX (devclass##_tx_fn_multiarch_register) (void)		\
{									\
  extern vnet_device_class_t devclass;					\
  vlib_node_fn_registration_t *r;					\
  r = &CLIB_MARCH_SFX (devclass##_tx_fn_registration);			\
  r->priority = CLIB_MARCH_FN_PRIORITY();				\
  r->next_registration = devclass.tx_fn_registrations;			\
  devclass.tx_fn_registrations = r;					\
}									\
uword CLIB_CPU_OPTIMIZED CLIB_MARCH_SFX (devclass##_tx_fn)

/**
 * Link Type: A description of the protocol of packets on the link.
 * On an ethernet link this maps directly into the ethertype. On a GRE tunnel
 * it maps to the GRE-proto, etc for other lnk types.
 */
typedef enum vnet_link_t_
{
#if CLIB_DEBUG > 0
  VNET_LINK_IP4 = 1,
#else
  VNET_LINK_IP4 = 0,
#endif
  VNET_LINK_IP6,
  VNET_LINK_MPLS,
  VNET_LINK_ETHERNET,
  VNET_LINK_ARP,
  VNET_LINK_NSH,
} __attribute__ ((packed)) vnet_link_t;

#define VNET_LINKS {                   \
    [VNET_LINK_ETHERNET] = "ethernet", \
    [VNET_LINK_IP4] = "ipv4",          \
    [VNET_LINK_IP6] = "ipv6",          \
    [VNET_LINK_MPLS] = "mpls",         \
    [VNET_LINK_ARP] = "arp",	       \
    [VNET_LINK_NSH] = "nsh",           \
}

#define FOR_EACH_VNET_LINK(_link)    \
  for (_link = VNET_LINK_IP4;        \
       _link <= VNET_LINK_NSH;       \
       _link++)

/**
 * @brief Number of link types. Not part of the enum so it does not have to be included in
 * switch statements
 */
#define VNET_LINK_NUM (VNET_LINK_NSH+1)

/**
 * @brief Convert a link to to an Ethertype
 */
extern vnet_l3_packet_type_t vnet_link_to_l3_proto (vnet_link_t link);

/**
 * @brief Attributes assignable to a HW interface Class.
 */
typedef enum vnet_hw_interface_class_flags_t_
{
  /**
   * @brief a point 2 point interface
   */
  VNET_HW_INTERFACE_CLASS_FLAG_P2P = (1 << 0),
  /**
   * @brief a non-broadcast multiple access interface
   */
  VNET_HW_INTERFACE_CLASS_FLAG_NBMA = (1 << 1),
} vnet_hw_interface_class_flags_t;

/* Layer-2 (e.g. Ethernet) interface class. */
typedef struct _vnet_hw_interface_class
{
  /* Index into main vector. */
  u32 index;

  /* Class name (e.g. "Ethernet"). */
  char *name;

  /* Flags */
  vnet_hw_interface_class_flags_t flags;

  /* Function to call when hardware interface is added/deleted. */
  vnet_interface_function_t *interface_add_del_function;

  /* Function to bring interface administratively up/down. */
  vnet_interface_function_t *admin_up_down_function;

  /* Function to call when link state changes. */
  vnet_interface_function_t *link_up_down_function;

  /* Function to call when link MAC changes. */
  vnet_interface_set_mac_address_function_t *mac_addr_change_function;

  /* Function to add/delete additional MAC addresses */
  vnet_interface_add_del_mac_address_function_t *mac_addr_add_del_function;

  /* Format function to display interface name. */
  format_function_t *format_interface_name;

  /* Format function to display interface address. */
  format_function_t *format_address;

  /* Format packet header for this interface class. */
  format_function_t *format_header;

  /* Format device verbosely for this class. */
  format_function_t *format_device;

  /* Parser for hardware (e.g. ethernet) address. */
  unformat_function_t *unformat_hw_address;

  /* Parser for packet header for e.g. rewrite string. */
  unformat_function_t *unformat_header;

  /* Builds a rewrite string for the interface to the destination
   * for the payload/link type. */
  u8 *(*build_rewrite) (struct vnet_main_t * vnm,
			u32 sw_if_index,
			vnet_link_t link_type, const void *dst_hw_address);

  /* Update an adjacency added by FIB (as opposed to via the
   * neighbour resolution protocol). */
  void (*update_adjacency) (struct vnet_main_t * vnm,
			    u32 sw_if_index, u32 adj_index);

    uword (*is_valid_class_for_interface) (struct vnet_main_t * vnm,
					   u32 hw_if_index,
					   u32 hw_class_index);

  /* Called when hw interface class is changed and old hardware instance
     may want to be deleted. */
  void (*hw_class_change) (struct vnet_main_t * vnm, u32 hw_if_index,
			   u32 old_class_index, u32 new_class_index);

  /* List of hw interface classes, built by constructors */
  struct _vnet_hw_interface_class *next_class_registration;

} vnet_hw_interface_class_t;

/**
 * @brief Return a complete, zero-length (aka dummy) rewrite
 */
extern u8 *default_build_rewrite (struct vnet_main_t *vnm,
				  u32 sw_if_index,
				  vnet_link_t link_type,
				  const void *dst_hw_address);

/**
 * @brief Default adjacency update function
 */
extern void default_update_adjacency (struct vnet_main_t *vnm,
				      u32 sw_if_index, u32 adj_index);

#define VNET_HW_INTERFACE_CLASS(x,...)                                  \
  __VA_ARGS__ vnet_hw_interface_class_t x;                              \
static void __vnet_add_hw_interface_class_registration_##x (void)       \
    __attribute__((__constructor__)) ;                                  \
static void __vnet_add_hw_interface_class_registration_##x (void)       \
{                                                                       \
    vnet_main_t * vnm = vnet_get_main();                                \
    x.next_class_registration = vnm->hw_interface_class_registrations;  \
    vnm->hw_interface_class_registrations = &x;                         \
}                                                                       \
static void __vnet_rm_hw_interface_class_registration_##x (void)        \
    __attribute__((__destructor__)) ;                                   \
static void __vnet_rm_hw_interface_class_registration_##x (void)        \
{                                                                       \
    vnet_main_t * vnm = vnet_get_main();                                \
    VLIB_REMOVE_FROM_LINKED_LIST (vnm->hw_interface_class_registrations,\
                                  &x, next_class_registration);         \
}                                                                       \
__VA_ARGS__ vnet_hw_interface_class_t x

typedef enum vnet_hw_interface_flags_t_
{
  VNET_HW_INTERFACE_FLAG_NONE,
  /* Hardware link state is up. */
  VNET_HW_INTERFACE_FLAG_LINK_UP = (1 << 0),
  /* Hardware duplex state */
  VNET_HW_INTERFACE_FLAG_HALF_DUPLEX = (1 << 1),
  VNET_HW_INTERFACE_FLAG_FULL_DUPLEX = (1 << 2),

  /* rx mode flags */
  VNET_HW_INTERFACE_FLAG_SUPPORTS_INT_MODE = (1 << 16),

  /* tx checksum offload */
  VNET_HW_INTERFACE_FLAG_SUPPORTS_TX_L4_CKSUM_OFFLOAD = (1 << 17),

  /* gso */
  VNET_HW_INTERFACE_FLAG_SUPPORTS_GSO = (1 << 18),

  /* non-broadcast multiple access */
  VNET_HW_INTERFACE_FLAG_NBMA = (1 << 19),
} vnet_hw_interface_flags_t;

#define VNET_HW_INTERFACE_FLAG_DUPLEX_SHIFT 1
#define VNET_HW_INTERFACE_FLAG_SPEED_SHIFT  3
#define VNET_HW_INTERFACE_FLAG_DUPLEX_MASK	\
  (VNET_HW_INTERFACE_FLAG_HALF_DUPLEX |		\
   VNET_HW_INTERFACE_FLAG_FULL_DUPLEX)

/* Hardware-interface.  This corresponds to a physical wire
   that packets flow over. */
typedef struct vnet_hw_interface_t
{
  CLIB_CACHE_LINE_ALIGN_MARK (cacheline0);
  /* Interface name. */
  u8 *name;

  /* flags */
  vnet_hw_interface_flags_t flags;


  /* link speed in kbps */
  u32 link_speed;

  /* Hardware address as vector.  Zero (e.g. zero-length vector) if no
     address for this class (e.g. PPP). */
  u8 *hw_address;

  /* Interface is up as far as software is concerned. */
  /* NAME.{output,tx} nodes for this interface. */
  u32 output_node_index, tx_node_index;

  /* (dev_class, dev_instance) uniquely identifies hw interface. */
  u32 dev_class_index;
  u32 dev_instance;

  /* (hw_class, hw_instance) uniquely identifies hw interface. */
  u32 hw_class_index;
  u32 hw_instance;

  /* Hardware index for this hardware interface. */
  u32 hw_if_index;

  /* Software index for this hardware interface. */
  u32 sw_if_index;

  /* Next index in interface-output node for this interface
     used by node function vnet_per_buffer_interface_output() */
  u32 output_node_next_index;

  /* Maximum transmit rate for this interface in bits/sec. */
  f64 max_rate_bits_per_sec;

  /* Smallest packet size supported by this interface. */
  u32 min_supported_packet_bytes;

  /* Largest packet size supported by this interface. */
  u32 max_supported_packet_bytes;

  /* Smallest packet size for this interface. */
  u32 min_packet_bytes;

  /* Largest packet size for this interface. */
  u32 max_packet_bytes;

  /* Hash table mapping sub interface id to sw_if_index. */
  uword *sub_interface_sw_if_index_by_id;

  /* Count of number of L2 subinterfaces */
  u32 l2_if_count;

  /* Bonded interface info -
     0       - not a bonded interface nor a slave
     ~0      - slave to a bonded interface
     others  - A bonded interface with a pointer to bitmap for all slaves */
  uword *bond_info;
#define VNET_HW_INTERFACE_BOND_INFO_NONE ((uword *) 0)
#define VNET_HW_INTERFACE_BOND_INFO_SLAVE ((uword *) ~0)

  /* Input node */
  u32 input_node_index;

  /* input node cpu index by queue */
  u32 *input_node_thread_index_by_queue;

  /* vnet_hw_interface_rx_mode by queue */
  u8 *rx_mode_by_queue;
  vnet_hw_interface_rx_mode default_rx_mode;

  /* device input device_and_queue runtime index */
  uword *dq_runtime_index_by_queue;

  /* numa node that hardware device connects to */
  u8 numa_node;

  /* trace */
  i32 n_trace;

  u32 trace_classify_table_index;
} vnet_hw_interface_t;

extern vnet_device_class_t vnet_local_interface_device_class;

typedef enum
{
  /* A hw interface. */
  VNET_SW_INTERFACE_TYPE_HARDWARE,

  /* A sub-interface. */
  VNET_SW_INTERFACE_TYPE_SUB,
  VNET_SW_INTERFACE_TYPE_P2P,
  VNET_SW_INTERFACE_TYPE_PIPE,
} vnet_sw_interface_type_t;

typedef struct
{
  /*
   * Subinterface ID. A number 0-N to uniquely identify
   * this subinterface under the main (parent?) interface
   */
  u32 id;

  /* Classification data. Used to associate packet header with subinterface. */
  struct
  {
    u16 outer_vlan_id;
    u16 inner_vlan_id;
    union
    {
      u16 raw_flags;
      struct
      {
	u16 no_tags:1;
	u16 one_tag:1;
	u16 two_tags:1;
	u16 dot1ad:1;		/* 0 = dot1q, 1=dot1ad */
	u16 exact_match:1;
	u16 default_sub:1;
	u16 outer_vlan_id_any:1;
	u16 inner_vlan_id_any:1;
      } flags;
    };
  } eth;
} vnet_sub_interface_t;

typedef struct
{
  /*
   * Subinterface ID. A number 0-N to uniquely identify
   * this subinterface under the main interface
   */
  u32 id;
  u32 pool_index;
  u8 client_mac[6];
} vnet_p2p_sub_interface_t;

typedef enum
{
  /* THe BVI interface */
  VNET_FLOOD_CLASS_BVI,
  /* Always flood */
  VNET_FLOOD_CLASS_NORMAL,
  VNET_FLOOD_CLASS_TUNNEL_MASTER,
  /* Does not flood when tunnel master is in the same L2 BD */
  VNET_FLOOD_CLASS_TUNNEL_NORMAL,
  /* Never flood to this type */
  VNET_FLOOD_CLASS_NO_FLOOD,
} vnet_flood_class_t;

/* Per protocol MTU */
typedef enum
{
  VNET_MTU_L3,			/* Default payload MTU (without L2 headers) */
  VNET_MTU_IP4,			/* Per-protocol MTUs overriding default */
  VNET_MTU_IP6,
  VNET_MTU_MPLS,
  VNET_N_MTU
} vnet_mtu_t;

extern vnet_mtu_t vnet_link_to_mtu (vnet_link_t link);

typedef enum vnet_sw_interface_flags_t_
{
  VNET_SW_INTERFACE_FLAG_NONE = 0,
  /* Interface is "up" meaning administratively up.
     Up in the sense of link state being up is maintained by hardware interface. */
  VNET_SW_INTERFACE_FLAG_ADMIN_UP = (1 << 0),

  /* Interface is disabled for forwarding: punt all traffic to slow-path. */
  VNET_SW_INTERFACE_FLAG_PUNT = (1 << 1),

  __VNET_SW_INTERFACE_FLAG_UNSUED = (1 << 2),

  VNET_SW_INTERFACE_FLAG_UNNUMBERED = (1 << 3),

  __VNET_SW_INTERFACE_FLAG_UNUSED2 = (1 << 4),

  /* Interface does not appear in CLI/API */
  VNET_SW_INTERFACE_FLAG_HIDDEN = (1 << 5),

  /* Interface in ERROR state */
  VNET_SW_INTERFACE_FLAG_ERROR = (1 << 6),

  /* Interface has IP configured directed broadcast */
  VNET_SW_INTERFACE_FLAG_DIRECTED_BCAST = (1 << 7),

} __attribute__ ((packed)) vnet_sw_interface_flags_t;

/* Software-interface.  This corresponds to a Ethernet VLAN, ATM vc, a
   tunnel, etc.  Configuration (e.g. IP address) gets attached to
   software interface. */
typedef struct
{
  vnet_sw_interface_type_t type:16;

  vnet_sw_interface_flags_t flags;

  /* Index for this interface. */
  u32 sw_if_index;

  /* Software interface index of super-interface;
     equal to sw_if_index if this interface is not a
     sub-interface. */
  u32 sup_sw_if_index;

  /* this swif is unnumbered, use addresses on unnumbered_sw_if_index... */
  u32 unnumbered_sw_if_index;

  /* VNET_SW_INTERFACE_TYPE_HARDWARE. */
  u32 hw_if_index;

  /* MTU for network layer (not including L2 headers) */
  u32 mtu[VNET_N_MTU];

  /* VNET_SW_INTERFACE_TYPE_SUB. */
  vnet_sub_interface_t sub;

  /* VNET_SW_INTERFACE_TYPE_P2P. */
  vnet_p2p_sub_interface_t p2p;

  vnet_flood_class_t flood_class;
} vnet_sw_interface_t;

typedef enum
{
  /* Simple counters. */
  VNET_INTERFACE_COUNTER_DROP = 0,
  VNET_INTERFACE_COUNTER_PUNT = 1,
  VNET_INTERFACE_COUNTER_IP4 = 2,
  VNET_INTERFACE_COUNTER_IP6 = 3,
  VNET_INTERFACE_COUNTER_RX_NO_BUF = 4,
  VNET_INTERFACE_COUNTER_RX_MISS = 5,
  VNET_INTERFACE_COUNTER_RX_ERROR = 6,
  VNET_INTERFACE_COUNTER_TX_ERROR = 7,
  VNET_INTERFACE_COUNTER_MPLS = 8,
  VNET_N_SIMPLE_INTERFACE_COUNTER = 9,
  /* Combined counters. */
  VNET_INTERFACE_COUNTER_RX = 0,
  VNET_INTERFACE_COUNTER_RX_UNICAST = 1,
  VNET_INTERFACE_COUNTER_RX_MULTICAST = 2,
  VNET_INTERFACE_COUNTER_RX_BROADCAST = 3,
  VNET_INTERFACE_COUNTER_TX = 4,
  VNET_INTERFACE_COUNTER_TX_UNICAST = 5,
  VNET_INTERFACE_COUNTER_TX_MULTICAST = 6,
  VNET_INTERFACE_COUNTER_TX_BROADCAST = 7,
  VNET_N_COMBINED_INTERFACE_COUNTER = 8,
} vnet_interface_counter_type_t;

#define foreach_rx_combined_interface_counter(_x)               \
  for (_x = VNET_INTERFACE_COUNTER_RX;                          \
       _x <= VNET_INTERFACE_COUNTER_RX_BROADCAST;               \
       _x++)

#define foreach_tx_combined_interface_counter(_x)               \
  for (_x = VNET_INTERFACE_COUNTER_TX;                          \
       _x <= VNET_INTERFACE_COUNTER_TX_BROADCAST;               \
       _x++)

#define foreach_simple_interface_counter_name	\
  _(DROP, drops, if)				\
  _(PUNT, punt, if)				\
  _(IP4, ip4, if)				\
  _(IP6, ip6, if)				\
  _(RX_NO_BUF, rx-no-buf, if)			\
  _(RX_MISS, rx-miss, if)			\
  _(RX_ERROR, rx-error, if)			\
  _(TX_ERROR, tx-error, if)         \
  _(MPLS, mpls, if)

#define foreach_combined_interface_counter_name	\
  _(RX, rx, if)					\
  _(RX_UNICAST, rx-unicast, if)			\
  _(RX_MULTICAST, rx-multicast, if)		\
  _(RX_BROADCAST, rx-broadcast, if)		\
  _(TX, tx, if)					\
  _(TX_UNICAST, tx-unicast, if)			\
  _(TX_MULTICAST, tx-multicast, if)		\
  _(TX_BROADCAST, tx-broadcast, if)

typedef enum
{
  COLLECT_SIMPLE_STATS = 0,
  COLLECT_DETAILED_STATS = 1,
} vnet_interface_stats_collection_mode_e;

extern int collect_detailed_interface_stats_flag;

static inline int
collect_detailed_interface_stats (void)
{
  return collect_detailed_interface_stats_flag;
}

void collect_detailed_interface_stats_flag_set (void);
void collect_detailed_interface_stats_flag_clear (void);


typedef struct
{
  u32 output_node_index;
  u32 tx_node_index;
} vnet_hw_interface_nodes_t;

typedef struct
{
  CLIB_CACHE_LINE_ALIGN_MARK (cacheline0);
  u32 *split_buffers;
} vnet_interface_per_thread_data_t;

typedef u8 *(*vnet_buffer_opquae_formatter_t) (const vlib_buffer_t * b,
					       u8 * s);

typedef struct
{
  /* Hardware interfaces. */
  vnet_hw_interface_t *hw_interfaces;

  /* Hash table mapping HW interface name to index. */
  uword *hw_interface_by_name;

  /* Vectors if hardware interface classes and device classes. */
  vnet_hw_interface_class_t *hw_interface_classes;
  vnet_device_class_t *device_classes;

  /* Hash table mapping name to hw interface/device class. */
  uword *hw_interface_class_by_name;
  uword *device_class_by_name;

  /* Software interfaces. */
  vnet_sw_interface_t *sw_interfaces;

  /* Hash table mapping sub intfc sw_if_index by sup sw_if_index and sub id */
  uword *sw_if_index_by_sup_and_sub;

  /* Software interface counters both simple and combined
     packet and byte counters. */
  clib_spinlock_t sw_if_counter_lock;
  vlib_simple_counter_main_t *sw_if_counters;
  vlib_combined_counter_main_t *combined_sw_if_counters;

  vnet_hw_interface_nodes_t *deleted_hw_interface_nodes;

  /*
   * pcap drop tracing
   * Only the drop filter hash lives here. See ../src/vlib/main.h for
   * the rest of the variables.
   */
  uword *pcap_drop_filter_hash;

  /* Buffer metadata format helper functions */
  vnet_buffer_opquae_formatter_t *buffer_opaque_format_helpers;
  vnet_buffer_opquae_formatter_t *buffer_opaque2_format_helpers;

  /* per-thread data */
  vnet_interface_per_thread_data_t *per_thread_data;

  /* feature_arc_index */
  u8 output_feature_arc_index;
} vnet_interface_main_t;

static inline void
vnet_interface_counter_lock (vnet_interface_main_t * im)
{
  if (im->sw_if_counter_lock)
    clib_spinlock_lock (&im->sw_if_counter_lock);
}

static inline void
vnet_interface_counter_unlock (vnet_interface_main_t * im)
{
  if (im->sw_if_counter_lock)
    clib_spinlock_unlock (&im->sw_if_counter_lock);
}

void vnet_pcap_drop_trace_filter_add_del (u32 error_index, int is_add);

int vnet_interface_name_renumber (u32 sw_if_index, u32 new_show_dev_instance);

uword vnet_interface_output_node (vlib_main_t * vm,
				  vlib_node_runtime_t * node,
				  vlib_frame_t * frame);

void vnet_register_format_buffer_opaque_helper
  (vnet_buffer_opquae_formatter_t fn);

void vnet_register_format_buffer_opaque2_helper
  (vnet_buffer_opquae_formatter_t fn);

typedef struct
{
  u8 *filename;
  int enable;
  int status;
  u32 packets_to_capture;
  u32 max_bytes_per_pkt;
  u8 rx_enable;
  u8 tx_enable;
  u8 drop_enable;
  u32 sw_if_index;
  int filter;
} vnet_pcap_dispatch_trace_args_t;

int vnet_pcap_dispatch_trace_configure (vnet_pcap_dispatch_trace_args_t *);

#endif /* included_vnet_interface_h */

/*
 * fd.io coding-style-patch-verification: ON
 *
 * Local Variables:
 * eval: (c-set-style "gnu")
 * End:
 */