src/vnet/ethernet/ethernet.h - fdio/vpp - Gitiles

 /*
  * 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.
  */
 /*
  * ethernet.h: types/functions for ethernet.
  *
  * 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_ethernet_h
 #define included_ethernet_h

 #include <vnet/vnet.h>
 #include <vnet/ethernet/packet.h>
 #include <vnet/pg/pg.h>
 #include <vnet/feature/feature.h>

 always_inline u64
 ethernet_mac_address_u64 (u8 * a)
 {
   return (((u64) a[0] << (u64) (5 * 8))
 	  | ((u64) a[1] << (u64) (4 * 8))
 	  | ((u64) a[2] << (u64) (3 * 8))
 	  | ((u64) a[3] << (u64) (2 * 8))
 	  | ((u64) a[4] << (u64) (1 * 8)) | ((u64) a[5] << (u64) (0 * 8)));
 }

 static inline int
 ethernet_mac_address_is_multicast_u64 (u64 a)
 {
   return (a & (1ULL << (5 * 8))) != 0;
 }

 static_always_inline int
 ethernet_frame_is_tagged (u16 type)
 {
 #if __SSE4_2__
   const __m128i ethertype_mask = _mm_set_epi16 (ETHERNET_TYPE_VLAN,
 						ETHERNET_TYPE_DOT1AD,
 						ETHERNET_TYPE_VLAN_9100,
 						ETHERNET_TYPE_VLAN_9200,
 						/* duplicate last one to
 						   fill register */
 						ETHERNET_TYPE_VLAN_9200,
 						ETHERNET_TYPE_VLAN_9200,
 						ETHERNET_TYPE_VLAN_9200,
 						ETHERNET_TYPE_VLAN_9200);

   __m128i r = _mm_set1_epi16 (type);
   r = _mm_cmpeq_epi16 (ethertype_mask, r);
   return !_mm_test_all_zeros (r, r);
 #else
   if ((type == ETHERNET_TYPE_VLAN) ||
       (type == ETHERNET_TYPE_DOT1AD) ||
       (type == ETHERNET_TYPE_VLAN_9100) || (type == ETHERNET_TYPE_VLAN_9200))
     return 1;
 #endif
   return 0;
 }

 /* Max. sized ethernet/vlan header for parsing. */
 typedef struct
 {
   ethernet_header_t ethernet;

   /* Allow up to 2 stacked vlan headers. */
   ethernet_vlan_header_t vlan[2];
 } ethernet_max_header_t;

 struct vnet_hw_interface_t;
 /* Ethernet flag change callback. */
 typedef u32 (ethernet_flag_change_function_t)
   (vnet_main_t * vnm, struct vnet_hw_interface_t * hi, u32 flags);

 #define ETHERNET_MIN_PACKET_BYTES  64
 #define ETHERNET_MAX_PACKET_BYTES  9216

 /* Ethernet interface instance. */
 typedef struct ethernet_interface
 {

   /* Accept all packets (promiscuous mode). */
 #define ETHERNET_INTERFACE_FLAG_ACCEPT_ALL (1 << 0)
 #define ETHERNET_INTERFACE_FLAG_CONFIG_PROMISC(flags) \
   (((flags) & ~ETHERNET_INTERFACE_FLAG_ACCEPT_ALL) == 0)

   /* Change MTU on interface from hw interface structure */
 #define ETHERNET_INTERFACE_FLAG_MTU (1 << 1)
 #define ETHERNET_INTERFACE_FLAG_CONFIG_MTU(flags) \
   ((flags) & ETHERNET_INTERFACE_FLAG_MTU)

   /* Callback, e.g. to turn on/off promiscuous mode */
   ethernet_flag_change_function_t *flag_change;

   u32 driver_instance;

   /* Ethernet (MAC) address for this interface. */
   u8 address[6];
 } ethernet_interface_t;

 extern vnet_hw_interface_class_t ethernet_hw_interface_class;

 typedef struct
 {
   /* Name (a c string). */
   char *name;

   /* Ethernet type in host byte order. */
   ethernet_type_t type;

   /* Node which handles this type. */
   u32 node_index;

   /* Next index for this type. */
   u32 next_index;
 } ethernet_type_info_t;

 typedef enum
 {
 #define ethernet_error(n,c,s) ETHERNET_ERROR_##n,
 #include <vnet/ethernet/error.def>
 #undef ethernet_error
   ETHERNET_N_ERROR,
 } ethernet_error_t;


 // Structs used when parsing packet to find sw_if_index

 typedef struct
 {
   u32 sw_if_index;
   u32 flags;
   // config entry is-valid flag
   // exact match flags (valid if packet has 0/1/2/3 tags)
   // L2 vs L3 forwarding mode
 #define SUBINT_CONFIG_MATCH_0_TAG (1<<0)
 #define SUBINT_CONFIG_MATCH_1_TAG (1<<1)
 #define SUBINT_CONFIG_MATCH_2_TAG (1<<2)
 #define SUBINT_CONFIG_MATCH_3_TAG (1<<3)
 #define SUBINT_CONFIG_VALID       (1<<4)
 #define SUBINT_CONFIG_L2          (1<<5)

 } subint_config_t;

 always_inline u32
 eth_create_valid_subint_match_flags (u32 num_tags)
 {
   return SUBINT_CONFIG_VALID | (1 << num_tags);
 }


 typedef struct
 {
   subint_config_t untagged_subint;
   subint_config_t default_subint;
   u16 dot1q_vlans;		// pool id for vlan table
   u16 dot1ad_vlans;		// pool id for vlan table
 } main_intf_t;

 typedef struct
 {
   subint_config_t single_tag_subint;
   subint_config_t inner_any_subint;
   u32 qinqs;			// pool id for qinq table
 } vlan_intf_t;

 typedef struct
 {
   vlan_intf_t vlans[ETHERNET_N_VLAN];
 } vlan_table_t;

 typedef struct
 {
   subint_config_t subint;
 } qinq_intf_t;

 typedef struct
 {
   qinq_intf_t vlans[ETHERNET_N_VLAN];
 } qinq_table_t;

 // Structure mapping to a next index based on ethertype.
 // Common ethertypes are stored explicitly, others are
 // stored in a sparse table.
 typedef struct
 {
   /* Sparse vector mapping ethernet type in network byte order
      to next index. */
   u16 *input_next_by_type;
   u32 *sparse_index_by_input_next_index;

   /* cached next indexes for common ethertypes */
   u32 input_next_ip4;
   u32 input_next_ip6;
   u32 input_next_mpls;
 } next_by_ethertype_t;

 typedef struct
 {
   vlib_main_t *vlib_main;

   /* next node index for the L3 input node of each ethertype */
   next_by_ethertype_t l3_next;

   /* next node index for L2 interfaces */
   u32 l2_next;

   /* flag and next node index for L3 redirect */
   u32 redirect_l3;
   u32 redirect_l3_next;

   /* Pool of ethernet interface instances. */
   ethernet_interface_t *interfaces;

   ethernet_type_info_t *type_infos;

   /* Hash tables mapping name/type to type info index. */
   uword *type_info_by_name, *type_info_by_type;

   // The root of the vlan parsing tables. A vector with one element
   // for each main interface, indexed by hw_if_index.
   main_intf_t *main_intfs;

   // Pool of vlan tables
   vlan_table_t *vlan_pool;

   // Pool of qinq tables;
   qinq_table_t *qinq_pool;

   /* Set to one to use AB.CD.EF instead of A:B:C:D:E:F as ethernet format. */
   int format_ethernet_address_16bit;

   /* debug: make sure we don't wipe out an ethernet registration by mistake */
   u8 next_by_ethertype_register_called;

   /* Feature arc index */
   u8 output_feature_arc_index;

   /* Allocated loopback instances */
   uword *bm_loopback_instances;
 } ethernet_main_t;

 ethernet_main_t ethernet_main;

 always_inline ethernet_type_info_t *
 ethernet_get_type_info (ethernet_main_t * em, ethernet_type_t type)
 {
   uword *p = hash_get (em->type_info_by_type, type);
   return p ? vec_elt_at_index (em->type_infos, p[0]) : 0;
 }

 ethernet_interface_t *ethernet_get_interface (ethernet_main_t * em,
 					      u32 hw_if_index);

 clib_error_t *ethernet_register_interface (vnet_main_t * vnm,
 					   u32 dev_class_index,
 					   u32 dev_instance,
 					   u8 * address,
 					   u32 * hw_if_index_return,
 					   ethernet_flag_change_function_t
 					   flag_change);

 void ethernet_delete_interface (vnet_main_t * vnm, u32 hw_if_index);

 /* Register given node index to take input for given ethernet type. */
 void
 ethernet_register_input_type (vlib_main_t * vm,
 			      ethernet_type_t type, u32 node_index);

 /* Register given node index to take input for packet from L2 interfaces. */
 void ethernet_register_l2_input (vlib_main_t * vm, u32 node_index);

 /* Register given node index to take redirected L3 traffic, and enable L3 redirect */
 void ethernet_register_l3_redirect (vlib_main_t * vm, u32 node_index);

 /* Formats ethernet address X:X:X:X:X:X */
 u8 *format_ethernet_address (u8 * s, va_list * args);
 u8 *format_ethernet_type (u8 * s, va_list * args);
 u8 *format_ethernet_vlan_tci (u8 * s, va_list * va);
 u8 *format_ethernet_header (u8 * s, va_list * args);
 u8 *format_ethernet_header_with_length (u8 * s, va_list * args);

 /* Parse ethernet address in either X:X:X:X:X:X unix or X.X.X cisco format. */
 uword unformat_ethernet_address (unformat_input_t * input, va_list * args);

 /* Parse ethernet type as 0xXXXX or type name from ethernet/types.def.
    In either host or network byte order. */
 uword
 unformat_ethernet_type_host_byte_order (unformat_input_t * input,
 					va_list * args);
 uword
 unformat_ethernet_type_net_byte_order (unformat_input_t * input,
 				       va_list * args);

 /* Parse ethernet header. */
 uword unformat_ethernet_header (unformat_input_t * input, va_list * args);

 /* Parse ethernet interface name; return hw_if_index. */
 uword unformat_ethernet_interface (unformat_input_t * input, va_list * args);

 uword unformat_pg_ethernet_header (unformat_input_t * input, va_list * args);

 always_inline void
 ethernet_setup_node (vlib_main_t * vm, u32 node_index)
 {
   vlib_node_t *n = vlib_get_node (vm, node_index);
   pg_node_t *pn = pg_get_node (node_index);

   n->format_buffer = format_ethernet_header_with_length;
   n->unformat_buffer = unformat_ethernet_header;
   pn->unformat_edit = unformat_pg_ethernet_header;
 }

 always_inline ethernet_header_t *
 ethernet_buffer_get_header (vlib_buffer_t * b)
 {
   return (void *)
     (b->data + vnet_buffer (b)->ethernet.start_of_ethernet_header);
 }

 /** Returns the number of VLAN headers in the current Ethernet frame in the
  * buffer. Returns 0, 1, 2 for the known header count. The value 3 indicates
  * the number of headers is not known.
  */
 #define ethernet_buffer_get_vlan_count(b) ( \
     ((b)->flags & ETH_BUFFER_VLAN_BITS) >> LOG2_ETH_BUFFER_VLAN_1_DEEP \
 )

 /** Sets the number of VLAN headers in the current Ethernet frame in the
  * buffer. Values 0, 1, 2 indicate  the header count. The value 3 indicates
  * the number of headers is not known.
  */
 #define ethernet_buffer_set_vlan_count(b, v) ( \
     (b)->flags = ((b)->flags & ~ETH_BUFFER_VLAN_BITS) | \
         (((v) << LOG2_ETH_BUFFER_VLAN_1_DEEP) & ETH_BUFFER_VLAN_BITS) \
 )

 /** Adjusts the vlan count by the delta in 'v' */
 #define ethernet_buffer_adjust_vlan_count(b, v) ( \
   ethernet_buffer_set_vlan_count(b,  \
       (word)ethernet_buffer_get_vlan_count(b) + (word)(v)) \
 )

 /** Adjusts the vlan count by the header size byte delta in 'v' */
 #define ethernet_buffer_adjust_vlan_count_by_bytes(b, v) ( \
     (b)->flags = ((b)->flags & ~ETH_BUFFER_VLAN_BITS) | (( \
         ((b)->flags & ETH_BUFFER_VLAN_BITS) + \
         ((v) << (LOG2_ETH_BUFFER_VLAN_1_DEEP - 2)) \
     ) & ETH_BUFFER_VLAN_BITS) \
 )

 /**
  * Determine the size of the Ethernet headers of the current frame in
  * the buffer. This uses the VLAN depth flags that are set by
  * ethernet-input. Because these flags are stored in the vlib_buffer_t
  * "flags" field this count is valid regardless of the node so long as it's
  * checked downstream of ethernet-input; That is, the value is not stored in
  * the opaque space.
  */
 #define ethernet_buffer_header_size(b) ( \
         ethernet_buffer_get_vlan_count((b)) * sizeof(ethernet_vlan_header_t) + \
         sizeof(ethernet_header_t) \
 )

 ethernet_main_t *ethernet_get_main (vlib_main_t * vm);
 u32 ethernet_set_flags (vnet_main_t * vnm, u32 hw_if_index, u32 flags);
 void ethernet_sw_interface_set_l2_mode (vnet_main_t * vnm, u32 sw_if_index,
 					u32 l2);
 void ethernet_sw_interface_set_l2_mode_noport (vnet_main_t * vnm,
 					       u32 sw_if_index, u32 l2);
 void ethernet_set_rx_redirect (vnet_main_t * vnm, vnet_hw_interface_t * hi,
 			       u32 enable);

 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_arp_unset_ip4_over_ethernet (vnet_main_t * vnm,
 				  u32 sw_if_index, void *a_arg);

 int vnet_proxy_arp_fib_reset (u32 fib_id);

 clib_error_t *next_by_ethertype_init (next_by_ethertype_t * l3_next);
 clib_error_t *next_by_ethertype_register (next_by_ethertype_t * l3_next,
 					  u32 ethertype, u32 next_index);

 int vnet_create_loopback_interface (u32 * sw_if_indexp, u8 * mac_address,
 				    u8 is_specified, u32 user_instance);
 int vnet_delete_loopback_interface (u32 sw_if_index);
 int vnet_delete_sub_interface (u32 sw_if_index);

 // Perform ethernet subinterface classification table lookups given
 // the ports's sw_if_index and fields extracted from the ethernet header.
 // The resulting tables are used by identify_subint().
 always_inline void
 eth_vlan_table_lookups (ethernet_main_t * em,
 			vnet_main_t * vnm,
 			u32 port_sw_if_index0,
 			u16 first_ethertype,
 			u16 outer_id,
 			u16 inner_id,
 			vnet_hw_interface_t ** hi,
 			main_intf_t ** main_intf,
 			vlan_intf_t ** vlan_intf, qinq_intf_t ** qinq_intf)
 {
   vlan_table_t *vlan_table;
   qinq_table_t *qinq_table;
   u32 vlan_table_id;

   // Read the main, vlan, and qinq interface table entries
   // TODO: Consider if/how to prefetch tables. Also consider
   // single-entry cache to skip table lookups and identify_subint()
   // processing.
   *hi = vnet_get_sup_hw_interface (vnm, port_sw_if_index0);
   *main_intf = vec_elt_at_index (em->main_intfs, (*hi)->hw_if_index);

   // Always read the vlan and qinq tables, even if there are not that
   // many tags on the packet. This makes the lookups and comparisons
   // easier (and less branchy).
   vlan_table_id = (first_ethertype == ETHERNET_TYPE_DOT1AD) ?
     (*main_intf)->dot1ad_vlans : (*main_intf)->dot1q_vlans;
   vlan_table = vec_elt_at_index (em->vlan_pool, vlan_table_id);
   *vlan_intf = &vlan_table->vlans[outer_id];

   qinq_table = vec_elt_at_index (em->qinq_pool, (*vlan_intf)->qinqs);
   *qinq_intf = &qinq_table->vlans[inner_id];
 }


 // Determine the subinterface for this packet, given the result of the
 // vlan table lookups and vlan header parsing. Check the most specific
 // matches first.
 // Returns 1 if a matching subinterface was found, otherwise returns 0.
 always_inline u32
 eth_identify_subint (vnet_hw_interface_t * hi,
 		     vlib_buffer_t * b0,
 		     u32 match_flags,
 		     main_intf_t * main_intf,
 		     vlan_intf_t * vlan_intf,
 		     qinq_intf_t * qinq_intf,
 		     u32 * new_sw_if_index, u8 * error0, u32 * is_l2)
 {
   subint_config_t *subint;

   // Each comparison is checking both the valid flag and the number of tags
   // (incorporating exact-match/non-exact-match).

   // check for specific double tag
   subint = &qinq_intf->subint;
   if ((subint->flags & match_flags) == match_flags)
     goto matched;

   // check for specific outer and 'any' inner
   subint = &vlan_intf->inner_any_subint;
   if ((subint->flags & match_flags) == match_flags)
     goto matched;

   // check for specific single tag
   subint = &vlan_intf->single_tag_subint;
   if ((subint->flags & match_flags) == match_flags)
     goto matched;

   // check for untagged interface
   subint = &main_intf->untagged_subint;
   if ((subint->flags & match_flags) == match_flags)
     goto matched;

   // check for default interface
   subint = &main_intf->default_subint;
   if ((subint->flags & match_flags) == match_flags)
     goto matched;

   // No matching subinterface
   *new_sw_if_index = ~0;
   *error0 = ETHERNET_ERROR_UNKNOWN_VLAN;
   *is_l2 = 0;
   return 0;

 matched:
   *new_sw_if_index = subint->sw_if_index;
   *is_l2 = subint->flags & SUBINT_CONFIG_L2;
   return 1;
 }

 // Compare two ethernet macs. Return 1 if they are the same, 0 if different
 always_inline u32
 eth_mac_equal (u8 * mac1, u8 * mac2)
 {
   return (*((u32 *) (mac1 + 0)) == *((u32 *) (mac2 + 0)) &&
 	  *((u32 *) (mac1 + 2)) == *((u32 *) (mac2 + 2)));
 }


 always_inline ethernet_main_t *
 vnet_get_ethernet_main (void)
 {
   return &ethernet_main;
 }

 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);

 void ethernet_arp_change_mac (u32 sw_if_index);
 void ethernet_ndp_change_mac (u32 sw_if_index);

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

 void ethernet_update_adjacency (vnet_main_t * vnm, u32 sw_if_index, u32 ai);
 u8 *ethernet_build_rewrite (vnet_main_t * vnm,
 			    u32 sw_if_index,
 			    vnet_link_t link_type, const void *dst_address);
 const u8 *ethernet_ip4_mcast_dst_addr (void);
 const u8 *ethernet_ip6_mcast_dst_addr (void);

 extern vlib_node_registration_t ethernet_input_node;

 #endif /* included_ethernet_h */

 /*
  * fd.io coding-style-patch-verification: ON
  *
  * Local Variables:
  * eval: (c-set-style "gnu")
  * End:
  */
	/*
	* 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.
	*/
	/*
	* ethernet.h: types/functions for ethernet.
	*
	* 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_ethernet_h
	#define included_ethernet_h

	#include <vnet/vnet.h>
	#include <vnet/ethernet/packet.h>
	#include <vnet/pg/pg.h>
	#include <vnet/feature/feature.h>

	always_inline u64
	ethernet_mac_address_u64 (u8 * a)
	{
	return (((u64) a[0] << (u64) (5 * 8))
	\| ((u64) a[1] << (u64) (4 * 8))
	\| ((u64) a[2] << (u64) (3 * 8))
	\| ((u64) a[3] << (u64) (2 * 8))
	\| ((u64) a[4] << (u64) (1 * 8)) \| ((u64) a[5] << (u64) (0 * 8)));
	}

	static inline int
	ethernet_mac_address_is_multicast_u64 (u64 a)
	{
	return (a & (1ULL << (5 * 8))) != 0;
	}

	static_always_inline int
	ethernet_frame_is_tagged (u16 type)
	{
	#if __SSE4_2__
	const __m128i ethertype_mask = _mm_set_epi16 (ETHERNET_TYPE_VLAN,
	ETHERNET_TYPE_DOT1AD,
	ETHERNET_TYPE_VLAN_9100,
	ETHERNET_TYPE_VLAN_9200,
	/* duplicate last one to
	fill register */
	ETHERNET_TYPE_VLAN_9200,
	ETHERNET_TYPE_VLAN_9200,
	ETHERNET_TYPE_VLAN_9200,
	ETHERNET_TYPE_VLAN_9200);

	__m128i r = _mm_set1_epi16 (type);
	r = _mm_cmpeq_epi16 (ethertype_mask, r);
	return !_mm_test_all_zeros (r, r);
	#else
	if ((type == ETHERNET_TYPE_VLAN) \|\|
	(type == ETHERNET_TYPE_DOT1AD) \|\|
	(type == ETHERNET_TYPE_VLAN_9100) \|\| (type == ETHERNET_TYPE_VLAN_9200))
	return 1;
	#endif
	return 0;
	}

	/* Max. sized ethernet/vlan header for parsing. */
	typedef struct
	{
	ethernet_header_t ethernet;

	/* Allow up to 2 stacked vlan headers. */
	ethernet_vlan_header_t vlan[2];
	} ethernet_max_header_t;

	struct vnet_hw_interface_t;
	/* Ethernet flag change callback. */
	typedef u32 (ethernet_flag_change_function_t)
	(vnet_main_t * vnm, struct vnet_hw_interface_t * hi, u32 flags);

	#define ETHERNET_MIN_PACKET_BYTES 64
	#define ETHERNET_MAX_PACKET_BYTES 9216

	/* Ethernet interface instance. */
	typedef struct ethernet_interface
	{

	/* Accept all packets (promiscuous mode). */
	#define ETHERNET_INTERFACE_FLAG_ACCEPT_ALL (1 << 0)
	#define ETHERNET_INTERFACE_FLAG_CONFIG_PROMISC(flags) \
	(((flags) & ~ETHERNET_INTERFACE_FLAG_ACCEPT_ALL) == 0)

	/* Change MTU on interface from hw interface structure */
	#define ETHERNET_INTERFACE_FLAG_MTU (1 << 1)
	#define ETHERNET_INTERFACE_FLAG_CONFIG_MTU(flags) \
	((flags) & ETHERNET_INTERFACE_FLAG_MTU)

	/* Callback, e.g. to turn on/off promiscuous mode */
	ethernet_flag_change_function_t *flag_change;

	u32 driver_instance;

	/* Ethernet (MAC) address for this interface. */
	u8 address[6];
	} ethernet_interface_t;

	extern vnet_hw_interface_class_t ethernet_hw_interface_class;

	typedef struct
	{
	/* Name (a c string). */
	char *name;

	/* Ethernet type in host byte order. */
	ethernet_type_t type;

	/* Node which handles this type. */
	u32 node_index;

	/* Next index for this type. */
	u32 next_index;
	} ethernet_type_info_t;

	typedef enum
	{
	#define ethernet_error(n,c,s) ETHERNET_ERROR_##n,
	#include <vnet/ethernet/error.def>
	#undef ethernet_error
	ETHERNET_N_ERROR,
	} ethernet_error_t;


	// Structs used when parsing packet to find sw_if_index

	typedef struct
	{
	u32 sw_if_index;
	u32 flags;
	// config entry is-valid flag
	// exact match flags (valid if packet has 0/1/2/3 tags)
	// L2 vs L3 forwarding mode
	#define SUBINT_CONFIG_MATCH_0_TAG (1<<0)
	#define SUBINT_CONFIG_MATCH_1_TAG (1<<1)
	#define SUBINT_CONFIG_MATCH_2_TAG (1<<2)
	#define SUBINT_CONFIG_MATCH_3_TAG (1<<3)
	#define SUBINT_CONFIG_VALID (1<<4)
	#define SUBINT_CONFIG_L2 (1<<5)

	} subint_config_t;

	always_inline u32
	eth_create_valid_subint_match_flags (u32 num_tags)
	{
	return SUBINT_CONFIG_VALID \| (1 << num_tags);
	}


	typedef struct
	{
	subint_config_t untagged_subint;
	subint_config_t default_subint;
	u16 dot1q_vlans; // pool id for vlan table
	u16 dot1ad_vlans; // pool id for vlan table
	} main_intf_t;

	typedef struct
	{
	subint_config_t single_tag_subint;
	subint_config_t inner_any_subint;
	u32 qinqs; // pool id for qinq table
	} vlan_intf_t;

	typedef struct
	{
	vlan_intf_t vlans[ETHERNET_N_VLAN];
	} vlan_table_t;

	typedef struct
	{
	subint_config_t subint;
	} qinq_intf_t;

	typedef struct
	{
	qinq_intf_t vlans[ETHERNET_N_VLAN];
	} qinq_table_t;

	// Structure mapping to a next index based on ethertype.
	// Common ethertypes are stored explicitly, others are
	// stored in a sparse table.
	typedef struct
	{
	/* Sparse vector mapping ethernet type in network byte order
	to next index. */
	u16 *input_next_by_type;
	u32 *sparse_index_by_input_next_index;

	/* cached next indexes for common ethertypes */
	u32 input_next_ip4;
	u32 input_next_ip6;
	u32 input_next_mpls;
	} next_by_ethertype_t;

	typedef struct
	{
	vlib_main_t *vlib_main;

	/* next node index for the L3 input node of each ethertype */
	next_by_ethertype_t l3_next;

	/* next node index for L2 interfaces */
	u32 l2_next;

	/* flag and next node index for L3 redirect */
	u32 redirect_l3;
	u32 redirect_l3_next;

	/* Pool of ethernet interface instances. */
	ethernet_interface_t *interfaces;

	ethernet_type_info_t *type_infos;

	/* Hash tables mapping name/type to type info index. */
	uword type_info_by_name, type_info_by_type;

	// The root of the vlan parsing tables. A vector with one element
	// for each main interface, indexed by hw_if_index.
	main_intf_t *main_intfs;

	// Pool of vlan tables
	vlan_table_t *vlan_pool;

	// Pool of qinq tables;
	qinq_table_t *qinq_pool;

	/* Set to one to use AB.CD.EF instead of A:B:C:D:E:F as ethernet format. */
	int format_ethernet_address_16bit;

	/* debug: make sure we don't wipe out an ethernet registration by mistake */
	u8 next_by_ethertype_register_called;

	/* Feature arc index */
	u8 output_feature_arc_index;

	/* Allocated loopback instances */
	uword *bm_loopback_instances;
	} ethernet_main_t;

	ethernet_main_t ethernet_main;

	always_inline ethernet_type_info_t *
	ethernet_get_type_info (ethernet_main_t * em, ethernet_type_t type)
	{
	uword *p = hash_get (em->type_info_by_type, type);
	return p ? vec_elt_at_index (em->type_infos, p[0]) : 0;
	}

	ethernet_interface_t ethernet_get_interface (ethernet_main_t em,
	u32 hw_if_index);

	clib_error_t ethernet_register_interface (vnet_main_t vnm,
	u32 dev_class_index,
	u32 dev_instance,
	u8 * address,
	u32 * hw_if_index_return,
	ethernet_flag_change_function_t
	flag_change);

	void ethernet_delete_interface (vnet_main_t * vnm, u32 hw_if_index);

	/* Register given node index to take input for given ethernet type. */
	void
	ethernet_register_input_type (vlib_main_t * vm,
	ethernet_type_t type, u32 node_index);

	/* Register given node index to take input for packet from L2 interfaces. */
	void ethernet_register_l2_input (vlib_main_t * vm, u32 node_index);

	/* Register given node index to take redirected L3 traffic, and enable L3 redirect */
	void ethernet_register_l3_redirect (vlib_main_t * vm, u32 node_index);

	/* Formats ethernet address X:X:X:X:X:X */
	u8 format_ethernet_address (u8 s, va_list * args);
	u8 format_ethernet_type (u8 s, va_list * args);
	u8 format_ethernet_vlan_tci (u8 s, va_list * va);
	u8 format_ethernet_header (u8 s, va_list * args);
	u8 format_ethernet_header_with_length (u8 s, va_list * args);

	/* Parse ethernet address in either X:X:X:X:X:X unix or X.X.X cisco format. */
	uword unformat_ethernet_address (unformat_input_t * input, va_list * args);

	/* Parse ethernet type as 0xXXXX or type name from ethernet/types.def.
	In either host or network byte order. */
	uword
	unformat_ethernet_type_host_byte_order (unformat_input_t * input,
	va_list * args);
	uword
	unformat_ethernet_type_net_byte_order (unformat_input_t * input,
	va_list * args);

	/* Parse ethernet header. */
	uword unformat_ethernet_header (unformat_input_t * input, va_list * args);

	/* Parse ethernet interface name; return hw_if_index. */
	uword unformat_ethernet_interface (unformat_input_t * input, va_list * args);

	uword unformat_pg_ethernet_header (unformat_input_t * input, va_list * args);

	always_inline void
	ethernet_setup_node (vlib_main_t * vm, u32 node_index)
	{
	vlib_node_t *n = vlib_get_node (vm, node_index);
	pg_node_t *pn = pg_get_node (node_index);

	n->format_buffer = format_ethernet_header_with_length;
	n->unformat_buffer = unformat_ethernet_header;
	pn->unformat_edit = unformat_pg_ethernet_header;
	}

	always_inline ethernet_header_t *
	ethernet_buffer_get_header (vlib_buffer_t * b)
	{
	return (void *)
	(b->data + vnet_buffer (b)->ethernet.start_of_ethernet_header);
	}

	/** Returns the number of VLAN headers in the current Ethernet frame in the
	* buffer. Returns 0, 1, 2 for the known header count. The value 3 indicates
	* the number of headers is not known.
	*/
	#define ethernet_buffer_get_vlan_count(b) ( \
	((b)->flags & ETH_BUFFER_VLAN_BITS) >> LOG2_ETH_BUFFER_VLAN_1_DEEP \
	)

	/** Sets the number of VLAN headers in the current Ethernet frame in the
	* buffer. Values 0, 1, 2 indicate the header count. The value 3 indicates
	* the number of headers is not known.
	*/
	#define ethernet_buffer_set_vlan_count(b, v) ( \
	(b)->flags = ((b)->flags & ~ETH_BUFFER_VLAN_BITS) \| \
	(((v) << LOG2_ETH_BUFFER_VLAN_1_DEEP) & ETH_BUFFER_VLAN_BITS) \
	)

	/** Adjusts the vlan count by the delta in 'v' */
	#define ethernet_buffer_adjust_vlan_count(b, v) ( \
	ethernet_buffer_set_vlan_count(b, \
	(word)ethernet_buffer_get_vlan_count(b) + (word)(v)) \
	)

	/** Adjusts the vlan count by the header size byte delta in 'v' */
	#define ethernet_buffer_adjust_vlan_count_by_bytes(b, v) ( \
	(b)->flags = ((b)->flags & ~ETH_BUFFER_VLAN_BITS) \| (( \
	((b)->flags & ETH_BUFFER_VLAN_BITS) + \
	((v) << (LOG2_ETH_BUFFER_VLAN_1_DEEP - 2)) \
	) & ETH_BUFFER_VLAN_BITS) \
	)

	/**
	* Determine the size of the Ethernet headers of the current frame in
	* the buffer. This uses the VLAN depth flags that are set by
	* ethernet-input. Because these flags are stored in the vlib_buffer_t
	* "flags" field this count is valid regardless of the node so long as it's
	* checked downstream of ethernet-input; That is, the value is not stored in
	* the opaque space.
	*/
	#define ethernet_buffer_header_size(b) ( \
	ethernet_buffer_get_vlan_count((b)) * sizeof(ethernet_vlan_header_t) + \
	sizeof(ethernet_header_t) \
	)

	ethernet_main_t ethernet_get_main (vlib_main_t vm);
	u32 ethernet_set_flags (vnet_main_t * vnm, u32 hw_if_index, u32 flags);
	void ethernet_sw_interface_set_l2_mode (vnet_main_t * vnm, u32 sw_if_index,
	u32 l2);
	void ethernet_sw_interface_set_l2_mode_noport (vnet_main_t * vnm,
	u32 sw_if_index, u32 l2);
	void ethernet_set_rx_redirect (vnet_main_t * vnm, vnet_hw_interface_t * hi,
	u32 enable);

	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_arp_unset_ip4_over_ethernet (vnet_main_t * vnm,
	u32 sw_if_index, void *a_arg);

	int vnet_proxy_arp_fib_reset (u32 fib_id);

	clib_error_t next_by_ethertype_init (next_by_ethertype_t l3_next);
	clib_error_t next_by_ethertype_register (next_by_ethertype_t l3_next,
	u32 ethertype, u32 next_index);

	int vnet_create_loopback_interface (u32 * sw_if_indexp, u8 * mac_address,
	u8 is_specified, u32 user_instance);
	int vnet_delete_loopback_interface (u32 sw_if_index);
	int vnet_delete_sub_interface (u32 sw_if_index);

	// Perform ethernet subinterface classification table lookups given
	// the ports's sw_if_index and fields extracted from the ethernet header.
	// The resulting tables are used by identify_subint().
	always_inline void
	eth_vlan_table_lookups (ethernet_main_t * em,
	vnet_main_t * vnm,
	u32 port_sw_if_index0,
	u16 first_ethertype,
	u16 outer_id,
	u16 inner_id,
	vnet_hw_interface_t ** hi,
	main_intf_t ** main_intf,
	vlan_intf_t vlan_intf, qinq_intf_t qinq_intf)
	{
	vlan_table_t *vlan_table;
	qinq_table_t *qinq_table;
	u32 vlan_table_id;

	// Read the main, vlan, and qinq interface table entries
	// TODO: Consider if/how to prefetch tables. Also consider
	// single-entry cache to skip table lookups and identify_subint()
	// processing.
	*hi = vnet_get_sup_hw_interface (vnm, port_sw_if_index0);
	main_intf = vec_elt_at_index (em->main_intfs, (hi)->hw_if_index);

	// Always read the vlan and qinq tables, even if there are not that
	// many tags on the packet. This makes the lookups and comparisons
	// easier (and less branchy).
	vlan_table_id = (first_ethertype == ETHERNET_TYPE_DOT1AD) ?
	(main_intf)->dot1ad_vlans : (main_intf)->dot1q_vlans;
	vlan_table = vec_elt_at_index (em->vlan_pool, vlan_table_id);
	*vlan_intf = &vlan_table->vlans[outer_id];

	qinq_table = vec_elt_at_index (em->qinq_pool, (*vlan_intf)->qinqs);
	*qinq_intf = &qinq_table->vlans[inner_id];
	}


	// Determine the subinterface for this packet, given the result of the
	// vlan table lookups and vlan header parsing. Check the most specific
	// matches first.
	// Returns 1 if a matching subinterface was found, otherwise returns 0.
	always_inline u32
	eth_identify_subint (vnet_hw_interface_t * hi,
	vlib_buffer_t * b0,
	u32 match_flags,
	main_intf_t * main_intf,
	vlan_intf_t * vlan_intf,
	qinq_intf_t * qinq_intf,
	u32 * new_sw_if_index, u8 * error0, u32 * is_l2)
	{
	subint_config_t *subint;

	// Each comparison is checking both the valid flag and the number of tags
	// (incorporating exact-match/non-exact-match).

	// check for specific double tag
	subint = &qinq_intf->subint;
	if ((subint->flags & match_flags) == match_flags)
	goto matched;

	// check for specific outer and 'any' inner
	subint = &vlan_intf->inner_any_subint;
	if ((subint->flags & match_flags) == match_flags)
	goto matched;

	// check for specific single tag
	subint = &vlan_intf->single_tag_subint;
	if ((subint->flags & match_flags) == match_flags)
	goto matched;

	// check for untagged interface
	subint = &main_intf->untagged_subint;
	if ((subint->flags & match_flags) == match_flags)
	goto matched;

	// check for default interface
	subint = &main_intf->default_subint;
	if ((subint->flags & match_flags) == match_flags)
	goto matched;

	// No matching subinterface
	*new_sw_if_index = ~0;
	*error0 = ETHERNET_ERROR_UNKNOWN_VLAN;
	*is_l2 = 0;
	return 0;

	matched:
	*new_sw_if_index = subint->sw_if_index;
	*is_l2 = subint->flags & SUBINT_CONFIG_L2;
	return 1;
	}

	// Compare two ethernet macs. Return 1 if they are the same, 0 if different
	always_inline u32
	eth_mac_equal (u8 * mac1, u8 * mac2)
	{
	return (((u32 ) (mac1 + 0)) == ((u32 ) (mac2 + 0)) &&
	((u32 ) (mac1 + 2)) == ((u32 ) (mac2 + 2)));
	}


	always_inline ethernet_main_t *
	vnet_get_ethernet_main (void)
	{
	return &ethernet_main;
	}

	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);

	void ethernet_arp_change_mac (u32 sw_if_index);
	void ethernet_ndp_change_mac (u32 sw_if_index);

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

	void ethernet_update_adjacency (vnet_main_t * vnm, u32 sw_if_index, u32 ai);
	u8 ethernet_build_rewrite (vnet_main_t vnm,
	u32 sw_if_index,
	vnet_link_t link_type, const void *dst_address);
	const u8 *ethernet_ip4_mcast_dst_addr (void);
	const u8 *ethernet_ip6_mcast_dst_addr (void);

	extern vlib_node_registration_t ethernet_input_node;

	#endif /* included_ethernet_h */

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