include/linux/if_packet.h

   1 #ifndef __LINUX_IF_PACKET_H
   2 #define __LINUX_IF_PACKET_H
   3
   4 struct sockaddr_pkt
   5 {
   6         unsigned short spkt_family;
   7         unsigned char spkt_device[14];
   8         unsigned short spkt_protocol;
   9 };
  10
  11 struct sockaddr_ll
  12 {
  13         unsigned short  sll_family;
  14         unsigned short  sll_protocol;
  15         int             sll_ifindex;
  16         unsigned short  sll_hatype;
  17         unsigned char   sll_pkttype;
  18         unsigned char   sll_halen;
  19         unsigned char   sll_addr[8];
  20 };
  21
  22 /* Packet types */
  23
  24 #define PACKET_HOST             0               /* To us                */
  25 #define PACKET_BROADCAST        1               /* To all               */
  26 #define PACKET_MULTICAST        2               /* To group             */
  27 #define PACKET_OTHERHOST        3               /* To someone else      */
  28 #define PACKET_OUTGOING         4               /* Outgoing of any type */
  29 /* These ones are invisible by user level */
  30 #define PACKET_LOOPBACK         5               /* MC/BRD frame looped back */
  31 #define PACKET_FASTROUTE        6               /* Fastrouted frame     */
  32
  33 /* Packet socket options */
  34
  35 #define PACKET_ADD_MEMBERSHIP           1
  36 #define PACKET_DROP_MEMBERSHIP          2
  37 #define PACKET_RECV_OUTPUT              3
  38 /* Value 4 is still used by obsolete turbo-packet. */
  39 #define PACKET_RX_RING                  5
  40 #define PACKET_STATISTICS               6
  41
  42 struct tpacket_stats
  43 {
  44         unsigned int    tp_packets;
  45         unsigned int    tp_drops;
  46 };
  47
  48 struct tpacket_hdr
  49 {
  50         unsigned long   tp_status;
  51 #define TP_STATUS_KERNEL        0
  52 #define TP_STATUS_USER          1
  53 #define TP_STATUS_COPY          2
  54 #define TP_STATUS_LOSING        4
  55         unsigned int    tp_len;
  56         unsigned int    tp_snaplen;
  57         unsigned short  tp_mac;
  58         unsigned short  tp_net;
  59         unsigned int    tp_sec;
  60         unsigned int    tp_usec;
  61 };
  62
  63 #define TPACKET_ALIGNMENT       16
  64 #define TPACKET_ALIGN(x)        (((x)+TPACKET_ALIGNMENT-1)&~(TPACKET_ALIGNMENT-1))
  65 #define TPACKET_HDRLEN          (TPACKET_ALIGN(sizeof(struct tpacket_hdr)) + sizeof(struct sockaddr_ll))
  66
  67 /*
  68    Frame structure:
  69
  70    - Start. Frame must be aligned to TPACKET_ALIGNMENT=16
  71    - struct tpacket_hdr
  72    - pad to TPACKET_ALIGNMENT=16
  73    - struct sockaddr_ll
  74    - Gap, chosen so that packet data (Start+tp_net) alignes to TPACKET_ALIGNMENT=16
  75    - Start+tp_mac: [ Optional MAC header ]
  76    - Start+tp_net: Packet data, aligned to TPACKET_ALIGNMENT=16.
  77    - Pad to align to TPACKET_ALIGNMENT=16
  78  */
  79
  80 struct tpacket_req
  81 {
  82         unsigned int    tp_block_size;  /* Minimal size of contiguous block */
  83         unsigned int    tp_block_nr;    /* Number of blocks */
  84         unsigned int    tp_frame_size;  /* Size of frame */
  85         unsigned int    tp_frame_nr;    /* Total number of frames */
  86 };
  87
  88 struct packet_mreq
  89 {
  90         int             mr_ifindex;
  91         unsigned short  mr_type;
  92         unsigned short  mr_alen;
  93         unsigned char   mr_address[8];
  94 };
  95
  96 #define PACKET_MR_MULTICAST     0
  97 #define PACKET_MR_PROMISC       1
  98 #define PACKET_MR_ALLMULTI      2
  99
 100 #endif