/*!\file net/if_packe.h
 *
 * Linux compatability header.
 */
#ifndef __LINUX_IF_PACKET_H
#define __LINUX_IF_PACKET_H

struct sockaddr_pkt
{
    unsigned short spkt_family;
    unsigned char  spkt_device[14];
    unsigned short spkt_protocol;
};

struct sockaddr_ll
{
    unsigned short   sll_family;
    unsigned short   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

struct tpacket_stats
{
    unsigned int    tp_packets;
    unsigned int    tp_drops;
};

struct tpacket_hdr
{
    unsigned long    tp_status;
#define TP_STATUS_KERNEL        0
#define TP_STATUS_USER          1
#define TP_STATUS_COPY          2
#define TP_STATUS_LOSING        4
#define TP_STATUS_CSUMNOTREADY  8
    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))

/*
   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 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

#endif
