root/include/linux/if_packet.h

INCLUDED FROM

#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

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

struct tpacket_auxdata
{
        __u32           tp_status;
        __u32           tp_len;
        __u32           tp_snaplen;
        __u16           tp_mac;
        __u16           tp_net;
        __u16           tp_vlan_tci;
};

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))

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;
};

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

enum tpacket_versions
{
        TPACKET_V1,
        TPACKET_V2,
};

/*
   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