#ifndef __LINUX_IF_PACKET_H
  #define __LINUX_IF_PACKET_H

  #include <linux/types.h>

  struct sockaddr_pkt {

  	unsigned short spkt_family;
  	unsigned char spkt_device[14];

  	__be16 spkt_protocol;

  };

  struct sockaddr_ll {

  	unsigned short	sll_family;

  	__be16		sll_protocol;

  	int		sll_ifindex;
  	unsigned short	sll_hatype;
  	unsigned char	sll_pkttype;
  	unsigned char	sll_halen;
  	unsigned char	sll_addr[8];
  };
  
  /* Packet types */
  
  #define PACKET_HOST		0		/* To us		*/
  #define PACKET_BROADCAST	1		/* To all		*/
  #define PACKET_MULTICAST	2		/* To group		*/
  #define PACKET_OTHERHOST	3		/* To someone else 	*/
  #define PACKET_OUTGOING		4		/* Outgoing of any type */
  /* These ones are invisible by user level */
  #define PACKET_LOOPBACK		5		/* MC/BRD frame looped back */
  #define PACKET_FASTROUTE	6		/* Fastrouted frame	*/
  
  /* Packet socket options */
  
  #define PACKET_ADD_MEMBERSHIP		1
  #define PACKET_DROP_MEMBERSHIP		2
  #define PACKET_RECV_OUTPUT		3
  /* Value 4 is still used by obsolete turbo-packet. */
  #define PACKET_RX_RING			5
  #define PACKET_STATISTICS		6
  #define PACKET_COPY_THRESH		7

  #define PACKET_AUXDATA			8

  #define PACKET_ORIGDEV			9

  #define PACKET_VERSION			10
  #define PACKET_HDRLEN			11

  #define PACKET_RESERVE			12

  #define PACKET_TX_RING			13
  #define PACKET_LOSS			14

  #define PACKET_VNET_HDR			15

  #define PACKET_TX_TIMESTAMP		16

  #define PACKET_TIMESTAMP		17

  #define PACKET_FANOUT			18
  
  #define PACKET_FANOUT_HASH		0
  #define PACKET_FANOUT_LB		1

  #define PACKET_FANOUT_CPU		2

  #define PACKET_FANOUT_FLAG_DEFRAG	0x8000

  struct tpacket_stats {

  	unsigned int	tp_packets;
  	unsigned int	tp_drops;
  };

  struct tpacket_stats_v3 {
  	unsigned int	tp_packets;
  	unsigned int	tp_drops;
  	unsigned int	tp_freeze_q_cnt;
  };
  
  union tpacket_stats_u {
  	struct tpacket_stats stats1;
  	struct tpacket_stats_v3 stats3;
  };

  struct tpacket_auxdata {

  	__u32		tp_status;
  	__u32		tp_len;
  	__u32		tp_snaplen;
  	__u16		tp_mac;
  	__u16		tp_net;

  	__u16		tp_vlan_tci;

  	__u16		tp_padding;

  };

  /* Rx ring - header status */
  #define TP_STATUS_KERNEL	0x0
  #define TP_STATUS_USER		0x1
  #define TP_STATUS_COPY		0x2
  #define TP_STATUS_LOSING	0x4
  #define TP_STATUS_CSUMNOTREADY	0x8

  #define TP_STATUS_VLAN_VALID   0x10 /* auxdata has valid tp_vlan_tci */

  #define TP_STATUS_BLK_TMO	0x20

  
  /* Tx ring - header status */
  #define TP_STATUS_AVAILABLE	0x0
  #define TP_STATUS_SEND_REQUEST	0x1
  #define TP_STATUS_SENDING	0x2
  #define TP_STATUS_WRONG_FORMAT	0x4

  /* Rx ring - feature request bits */
  #define TP_FT_REQ_FILL_RXHASH	0x1

  struct tpacket_hdr {

  	unsigned long	tp_status;

  	unsigned int	tp_len;
  	unsigned int	tp_snaplen;
  	unsigned short	tp_mac;
  	unsigned short	tp_net;
  	unsigned int	tp_sec;
  	unsigned int	tp_usec;
  };
  
  #define TPACKET_ALIGNMENT	16
  #define TPACKET_ALIGN(x)	(((x)+TPACKET_ALIGNMENT-1)&~(TPACKET_ALIGNMENT-1))
  #define TPACKET_HDRLEN		(TPACKET_ALIGN(sizeof(struct tpacket_hdr)) + sizeof(struct sockaddr_ll))

  struct tpacket2_hdr {

  	__u32		tp_status;
  	__u32		tp_len;
  	__u32		tp_snaplen;
  	__u16		tp_mac;
  	__u16		tp_net;
  	__u32		tp_sec;
  	__u32		tp_nsec;

  	__u16		tp_vlan_tci;

  	__u16		tp_padding;

  };

  struct tpacket_hdr_variant1 {

  	__u32	tp_rxhash;
  	__u32	tp_vlan_tci;
  };
  
  struct tpacket3_hdr {
  	__u32		tp_next_offset;
  	__u32		tp_sec;
  	__u32		tp_nsec;
  	__u32		tp_snaplen;
  	__u32		tp_len;
  	__u32		tp_status;
  	__u16		tp_mac;
  	__u16		tp_net;
  	/* pkt_hdr variants */
  	union {

  		struct tpacket_hdr_variant1 hv1;

  	};
  };

  struct tpacket_bd_ts {

  	unsigned int ts_sec;
  	union {
  		unsigned int ts_usec;
  		unsigned int ts_nsec;
  	};
  };

  struct tpacket_hdr_v1 {

  	__u32	block_status;
  	__u32	num_pkts;
  	__u32	offset_to_first_pkt;
  
  	/* Number of valid bytes (including padding)
  	 * blk_len <= tp_block_size
  	 */
  	__u32	blk_len;
  
  	/*
  	 * Quite a few uses of sequence number:
  	 * 1. Make sure cache flush etc worked.
  	 *    Well, one can argue - why not use the increasing ts below?
  	 *    But look at 2. below first.
  	 * 2. When you pass around blocks to other user space decoders,
  	 *    you can see which blk[s] is[are] outstanding etc.
  	 * 3. Validate kernel code.
  	 */

  	__aligned_u64	seq_num;

  
  	/*
  	 * ts_last_pkt:
  	 *
  	 * Case 1.	Block has 'N'(N >=1) packets and TMO'd(timed out)
  	 *		ts_last_pkt == 'time-stamp of last packet' and NOT the
  	 *		time when the timer fired and the block was closed.
  	 *		By providing the ts of the last packet we can absolutely
  	 *		guarantee that time-stamp wise, the first packet in the
  	 *		next block will never precede the last packet of the
  	 *		previous block.
  	 * Case 2.	Block has zero packets and TMO'd
  	 *		ts_last_pkt = time when the timer fired and the block
  	 *		was closed.
  	 * Case 3.	Block has 'N' packets and NO TMO.
  	 *		ts_last_pkt = time-stamp of the last pkt in the block.
  	 *
  	 * ts_first_pkt:
  	 *		Is always the time-stamp when the block was opened.
  	 *		Case a)	ZERO packets
  	 *			No packets to deal with but atleast you know the
  	 *			time-interval of this block.
  	 *		Case b) Non-zero packets
  	 *			Use the ts of the first packet in the block.
  	 *
  	 */

  	struct tpacket_bd_ts	ts_first_pkt, ts_last_pkt;

  };

  union tpacket_bd_header_u {
  	struct tpacket_hdr_v1 bh1;

  };

  struct tpacket_block_desc {

  	__u32 version;
  	__u32 offset_to_priv;

  	union tpacket_bd_header_u hdr;

  };

  #define TPACKET2_HDRLEN		(TPACKET_ALIGN(sizeof(struct tpacket2_hdr)) + sizeof(struct sockaddr_ll))

  #define TPACKET3_HDRLEN		(TPACKET_ALIGN(sizeof(struct tpacket3_hdr)) + sizeof(struct sockaddr_ll))

  enum tpacket_versions {

  	TPACKET_V1,
  	TPACKET_V2,

  	TPACKET_V3

  };

  /*
     Frame structure:
  
     - Start. Frame must be aligned to TPACKET_ALIGNMENT=16
     - struct tpacket_hdr
     - pad to TPACKET_ALIGNMENT=16
     - struct sockaddr_ll
     - Gap, chosen so that packet data (Start+tp_net) alignes to TPACKET_ALIGNMENT=16
     - Start+tp_mac: [ Optional MAC header ]
     - Start+tp_net: Packet data, aligned to TPACKET_ALIGNMENT=16.
     - Pad to align to TPACKET_ALIGNMENT=16
   */

  struct tpacket_req {

  	unsigned int	tp_block_size;	/* Minimal size of contiguous block */
  	unsigned int	tp_block_nr;	/* Number of blocks */
  	unsigned int	tp_frame_size;	/* Size of frame */
  	unsigned int	tp_frame_nr;	/* Total number of frames */
  };

  struct tpacket_req3 {
  	unsigned int	tp_block_size;	/* Minimal size of contiguous block */
  	unsigned int	tp_block_nr;	/* Number of blocks */
  	unsigned int	tp_frame_size;	/* Size of frame */
  	unsigned int	tp_frame_nr;	/* Total number of frames */
  	unsigned int	tp_retire_blk_tov; /* timeout in msecs */
  	unsigned int	tp_sizeof_priv; /* offset to private data area */
  	unsigned int	tp_feature_req_word;
  };
  
  union tpacket_req_u {
  	struct tpacket_req	req;
  	struct tpacket_req3	req3;
  };

  struct packet_mreq {

  	int		mr_ifindex;
  	unsigned short	mr_type;
  	unsigned short	mr_alen;
  	unsigned char	mr_address[8];
  };
  
  #define PACKET_MR_MULTICAST	0
  #define PACKET_MR_PROMISC	1
  #define PACKET_MR_ALLMULTI	2

  #define PACKET_MR_UNICAST	3

  
  #endif