linux/include/linux/if_packet.h
<<
>>
Prefs
   1#ifndef __LINUX_IF_PACKET_H
   2#define __LINUX_IF_PACKET_H
   3
   4#include <linux/types.h>
   5
   6struct sockaddr_pkt {
   7        unsigned short spkt_family;
   8        unsigned char spkt_device[14];
   9        __be16 spkt_protocol;
  10};
  11
  12struct sockaddr_ll {
  13        unsigned short  sll_family;
  14        __be16          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#define PACKET_COPY_THRESH              7
  42#define PACKET_AUXDATA                  8
  43#define PACKET_ORIGDEV                  9
  44#define PACKET_VERSION                  10
  45#define PACKET_HDRLEN                   11
  46#define PACKET_RESERVE                  12
  47#define PACKET_TX_RING                  13
  48#define PACKET_LOSS                     14
  49#define PACKET_VNET_HDR                 15
  50#define PACKET_TX_TIMESTAMP             16
  51#define PACKET_TIMESTAMP                17
  52#define PACKET_FANOUT                   18
  53
  54#define PACKET_FANOUT_HASH              0
  55#define PACKET_FANOUT_LB                1
  56#define PACKET_FANOUT_CPU               2
  57#define PACKET_FANOUT_FLAG_DEFRAG       0x8000
  58
  59struct tpacket_stats {
  60        unsigned int    tp_packets;
  61        unsigned int    tp_drops;
  62};
  63
  64struct tpacket_stats_v3 {
  65        unsigned int    tp_packets;
  66        unsigned int    tp_drops;
  67        unsigned int    tp_freeze_q_cnt;
  68};
  69
  70union tpacket_stats_u {
  71        struct tpacket_stats stats1;
  72        struct tpacket_stats_v3 stats3;
  73};
  74
  75struct tpacket_auxdata {
  76        __u32           tp_status;
  77        __u32           tp_len;
  78        __u32           tp_snaplen;
  79        __u16           tp_mac;
  80        __u16           tp_net;
  81        __u16           tp_vlan_tci;
  82        __u16           tp_padding;
  83};
  84
  85/* Rx ring - header status */
  86#define TP_STATUS_KERNEL        0x0
  87#define TP_STATUS_USER          0x1
  88#define TP_STATUS_COPY          0x2
  89#define TP_STATUS_LOSING        0x4
  90#define TP_STATUS_CSUMNOTREADY  0x8
  91#define TP_STATUS_VLAN_VALID   0x10 /* auxdata has valid tp_vlan_tci */
  92#define TP_STATUS_BLK_TMO       0x20
  93
  94/* Tx ring - header status */
  95#define TP_STATUS_AVAILABLE     0x0
  96#define TP_STATUS_SEND_REQUEST  0x1
  97#define TP_STATUS_SENDING       0x2
  98#define TP_STATUS_WRONG_FORMAT  0x4
  99
 100/* Rx ring - feature request bits */
 101#define TP_FT_REQ_FILL_RXHASH   0x1
 102
 103struct tpacket_hdr {
 104        unsigned long   tp_status;
 105        unsigned int    tp_len;
 106        unsigned int    tp_snaplen;
 107        unsigned short  tp_mac;
 108        unsigned short  tp_net;
 109        unsigned int    tp_sec;
 110        unsigned int    tp_usec;
 111};
 112
 113#define TPACKET_ALIGNMENT       16
 114#define TPACKET_ALIGN(x)        (((x)+TPACKET_ALIGNMENT-1)&~(TPACKET_ALIGNMENT-1))
 115#define TPACKET_HDRLEN          (TPACKET_ALIGN(sizeof(struct tpacket_hdr)) + sizeof(struct sockaddr_ll))
 116
 117struct tpacket2_hdr {
 118        __u32           tp_status;
 119        __u32           tp_len;
 120        __u32           tp_snaplen;
 121        __u16           tp_mac;
 122        __u16           tp_net;
 123        __u32           tp_sec;
 124        __u32           tp_nsec;
 125        __u16           tp_vlan_tci;
 126        __u16           tp_padding;
 127};
 128
 129struct tpacket_hdr_variant1 {
 130        __u32   tp_rxhash;
 131        __u32   tp_vlan_tci;
 132};
 133
 134struct tpacket3_hdr {
 135        __u32           tp_next_offset;
 136        __u32           tp_sec;
 137        __u32           tp_nsec;
 138        __u32           tp_snaplen;
 139        __u32           tp_len;
 140        __u32           tp_status;
 141        __u16           tp_mac;
 142        __u16           tp_net;
 143        /* pkt_hdr variants */
 144        union {
 145                struct tpacket_hdr_variant1 hv1;
 146        };
 147};
 148
 149struct tpacket_bd_ts {
 150        unsigned int ts_sec;
 151        union {
 152                unsigned int ts_usec;
 153                unsigned int ts_nsec;
 154        };
 155};
 156
 157struct tpacket_hdr_v1 {
 158        __u32   block_status;
 159        __u32   num_pkts;
 160        __u32   offset_to_first_pkt;
 161
 162        /* Number of valid bytes (including padding)
 163         * blk_len <= tp_block_size
 164         */
 165        __u32   blk_len;
 166
 167        /*
 168         * Quite a few uses of sequence number:
 169         * 1. Make sure cache flush etc worked.
 170         *    Well, one can argue - why not use the increasing ts below?
 171         *    But look at 2. below first.
 172         * 2. When you pass around blocks to other user space decoders,
 173         *    you can see which blk[s] is[are] outstanding etc.
 174         * 3. Validate kernel code.
 175         */
 176        __aligned_u64   seq_num;
 177
 178        /*
 179         * ts_last_pkt:
 180         *
 181         * Case 1.      Block has 'N'(N >=1) packets and TMO'd(timed out)
 182         *              ts_last_pkt == 'time-stamp of last packet' and NOT the
 183         *              time when the timer fired and the block was closed.
 184         *              By providing the ts of the last packet we can absolutely
 185         *              guarantee that time-stamp wise, the first packet in the
 186         *              next block will never precede the last packet of the
 187         *              previous block.
 188         * Case 2.      Block has zero packets and TMO'd
 189         *              ts_last_pkt = time when the timer fired and the block
 190         *              was closed.
 191         * Case 3.      Block has 'N' packets and NO TMO.
 192         *              ts_last_pkt = time-stamp of the last pkt in the block.
 193         *
 194         * ts_first_pkt:
 195         *              Is always the time-stamp when the block was opened.
 196         *              Case a) ZERO packets
 197         *                      No packets to deal with but atleast you know the
 198         *                      time-interval of this block.
 199         *              Case b) Non-zero packets
 200         *                      Use the ts of the first packet in the block.
 201         *
 202         */
 203        struct tpacket_bd_ts    ts_first_pkt, ts_last_pkt;
 204};
 205
 206union tpacket_bd_header_u {
 207        struct tpacket_hdr_v1 bh1;
 208};
 209
 210struct tpacket_block_desc {
 211        __u32 version;
 212        __u32 offset_to_priv;
 213        union tpacket_bd_header_u hdr;
 214};
 215
 216#define TPACKET2_HDRLEN         (TPACKET_ALIGN(sizeof(struct tpacket2_hdr)) + sizeof(struct sockaddr_ll))
 217#define TPACKET3_HDRLEN         (TPACKET_ALIGN(sizeof(struct tpacket3_hdr)) + sizeof(struct sockaddr_ll))
 218
 219enum tpacket_versions {
 220        TPACKET_V1,
 221        TPACKET_V2,
 222        TPACKET_V3
 223};
 224
 225/*
 226   Frame structure:
 227
 228   - Start. Frame must be aligned to TPACKET_ALIGNMENT=16
 229   - struct tpacket_hdr
 230   - pad to TPACKET_ALIGNMENT=16
 231   - struct sockaddr_ll
 232   - Gap, chosen so that packet data (Start+tp_net) alignes to TPACKET_ALIGNMENT=16
 233   - Start+tp_mac: [ Optional MAC header ]
 234   - Start+tp_net: Packet data, aligned to TPACKET_ALIGNMENT=16.
 235   - Pad to align to TPACKET_ALIGNMENT=16
 236 */
 237
 238struct tpacket_req {
 239        unsigned int    tp_block_size;  /* Minimal size of contiguous block */
 240        unsigned int    tp_block_nr;    /* Number of blocks */
 241        unsigned int    tp_frame_size;  /* Size of frame */
 242        unsigned int    tp_frame_nr;    /* Total number of frames */
 243};
 244
 245struct tpacket_req3 {
 246        unsigned int    tp_block_size;  /* Minimal size of contiguous block */
 247        unsigned int    tp_block_nr;    /* Number of blocks */
 248        unsigned int    tp_frame_size;  /* Size of frame */
 249        unsigned int    tp_frame_nr;    /* Total number of frames */
 250        unsigned int    tp_retire_blk_tov; /* timeout in msecs */
 251        unsigned int    tp_sizeof_priv; /* offset to private data area */
 252        unsigned int    tp_feature_req_word;
 253};
 254
 255union tpacket_req_u {
 256        struct tpacket_req      req;
 257        struct tpacket_req3     req3;
 258};
 259
 260struct packet_mreq {
 261        int             mr_ifindex;
 262        unsigned short  mr_type;
 263        unsigned short  mr_alen;
 264        unsigned char   mr_address[8];
 265};
 266
 267#define PACKET_MR_MULTICAST     0
 268#define PACKET_MR_PROMISC       1
 269#define PACKET_MR_ALLMULTI      2
 270#define PACKET_MR_UNICAST       3
 271
 272#endif
 273
lxr.linux.no kindly hosted by Redpill Linpro AS, provider of Linux consulting and operations services since 1995.