include/uapi/linux/if_packet.h

   1 #ifndef __LINUX_IF_PACKET_H
   2 #define __LINUX_IF_PACKET_H
   3
   4 #include <linux/types.h>
   5
   6 struct sockaddr_pkt {
   7         unsigned short spkt_family;
   8         unsigned char spkt_device[14];
   9         __be16 spkt_protocol;
  10 };
  11
  12 struct 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 #define PACKET_LOOPBACK         5               /* MC/BRD frame looped back */
  30 #define PACKET_USER             6               /* To user space        */
  31 #define PACKET_KERNEL           7               /* To kernel space      */
  32 /* Unused, PACKET_FASTROUTE and PACKET_LOOPBACK are invisible to user space */
  33 #define PACKET_FASTROUTE        6               /* Fastrouted frame     */
  34
  35 /* Packet socket options */
  36
  37 #define PACKET_ADD_MEMBERSHIP           1
  38 #define PACKET_DROP_MEMBERSHIP          2
  39 #define PACKET_RECV_OUTPUT              3
  40 /* Value 4 is still used by obsolete turbo-packet. */
  41 #define PACKET_RX_RING                  5
  42 #define PACKET_STATISTICS               6
  43 #define PACKET_COPY_THRESH              7
  44 #define PACKET_AUXDATA                  8
  45 #define PACKET_ORIGDEV                  9
  46 #define PACKET_VERSION                  10
  47 #define PACKET_HDRLEN                   11
  48 #define PACKET_RESERVE                  12
  49 #define PACKET_TX_RING                  13
  50 #define PACKET_LOSS                     14
  51 #define PACKET_VNET_HDR                 15
  52 #define PACKET_TX_TIMESTAMP             16
  53 #define PACKET_TIMESTAMP                17
  54 #define PACKET_FANOUT                   18
  55 #define PACKET_TX_HAS_OFF               19
  56 #define PACKET_QDISC_BYPASS             20
  57 #define PACKET_ROLLOVER_STATS           21
  58 #define PACKET_FANOUT_DATA              22
  59
  60 #define PACKET_FANOUT_HASH              0
  61 #define PACKET_FANOUT_LB                1
  62 #define PACKET_FANOUT_CPU               2
  63 #define PACKET_FANOUT_ROLLOVER          3
  64 #define PACKET_FANOUT_RND               4
  65 #define PACKET_FANOUT_QM                5
  66 #define PACKET_FANOUT_CBPF              6
  67 #define PACKET_FANOUT_EBPF              7
  68 #define PACKET_FANOUT_FLAG_ROLLOVER     0x1000
  69 #define PACKET_FANOUT_FLAG_DEFRAG       0x8000
  70
  71 struct tpacket_stats {
  72         unsigned int    tp_packets;
  73         unsigned int    tp_drops;
  74 };
  75
  76 struct tpacket_stats_v3 {
  77         unsigned int    tp_packets;
  78         unsigned int    tp_drops;
  79         unsigned int    tp_freeze_q_cnt;
  80 };
  81
  82 struct tpacket_rollover_stats {
  83         __aligned_u64   tp_all;
  84         __aligned_u64   tp_huge;
  85         __aligned_u64   tp_failed;
  86 };
  87
  88 union tpacket_stats_u {
  89         struct tpacket_stats stats1;
  90         struct tpacket_stats_v3 stats3;
  91 };
  92
  93 struct tpacket_auxdata {
  94         __u32           tp_status;
  95         __u32           tp_len;
  96         __u32           tp_snaplen;
  97         __u16           tp_mac;
  98         __u16           tp_net;
  99         __u16           tp_vlan_tci;
 100         __u16           tp_vlan_tpid;
 101 };
 102
 103 /* Rx ring - header status */
 104 #define TP_STATUS_KERNEL                      0
 105 #define TP_STATUS_USER                  (1 << 0)
 106 #define TP_STATUS_COPY                  (1 << 1)
 107 #define TP_STATUS_LOSING                (1 << 2)
 108 #define TP_STATUS_CSUMNOTREADY          (1 << 3)
 109 #define TP_STATUS_VLAN_VALID            (1 << 4) /* auxdata has valid tp_vlan_tci */
 110 #define TP_STATUS_BLK_TMO               (1 << 5)
 111 #define TP_STATUS_VLAN_TPID_VALID       (1 << 6) /* auxdata has valid tp_vlan_tpid */
 112 #define TP_STATUS_CSUM_VALID            (1 << 7)
 113
 114 /* Tx ring - header status */
 115 #define TP_STATUS_AVAILABLE           0
 116 #define TP_STATUS_SEND_REQUEST  (1 << 0)
 117 #define TP_STATUS_SENDING       (1 << 1)
 118 #define TP_STATUS_WRONG_FORMAT  (1 << 2)
 119
 120 /* Rx and Tx ring - header status */
 121 #define TP_STATUS_TS_SOFTWARE           (1 << 29)
 122 #define TP_STATUS_TS_SYS_HARDWARE       (1 << 30) /* deprecated, never set */
 123 #define TP_STATUS_TS_RAW_HARDWARE       (1 << 31)
 124
 125 /* Rx ring - feature request bits */
 126 #define TP_FT_REQ_FILL_RXHASH   0x1
 127
 128 struct tpacket_hdr {
 129         unsigned long   tp_status;
 130         unsigned int    tp_len;
 131         unsigned int    tp_snaplen;
 132         unsigned short  tp_mac;
 133         unsigned short  tp_net;
 134         unsigned int    tp_sec;
 135         unsigned int    tp_usec;
 136 };
 137
 138 #define TPACKET_ALIGNMENT       16
 139 #define TPACKET_ALIGN(x)        (((x)+TPACKET_ALIGNMENT-1)&~(TPACKET_ALIGNMENT-1))
 140 #define TPACKET_HDRLEN          (TPACKET_ALIGN(sizeof(struct tpacket_hdr)) + sizeof(struct sockaddr_ll))
 141
 142 struct tpacket2_hdr {
 143         __u32           tp_status;
 144         __u32           tp_len;
 145         __u32           tp_snaplen;
 146         __u16           tp_mac;
 147         __u16           tp_net;
 148         __u32           tp_sec;
 149         __u32           tp_nsec;
 150         __u16           tp_vlan_tci;
 151         __u16           tp_vlan_tpid;
 152         __u8            tp_padding[4];
 153 };
 154
 155 struct tpacket_hdr_variant1 {
 156         __u32   tp_rxhash;
 157         __u32   tp_vlan_tci;
 158         __u16   tp_vlan_tpid;
 159         __u16   tp_padding;
 160 };
 161
 162 struct tpacket3_hdr {
 163         __u32           tp_next_offset;
 164         __u32           tp_sec;
 165         __u32           tp_nsec;
 166         __u32           tp_snaplen;
 167         __u32           tp_len;
 168         __u32           tp_status;
 169         __u16           tp_mac;
 170         __u16           tp_net;
 171         /* pkt_hdr variants */
 172         union {
 173                 struct tpacket_hdr_variant1 hv1;
 174         };
 175         __u8            tp_padding[8];
 176 };
 177
 178 struct tpacket_bd_ts {
 179         unsigned int ts_sec;
 180         union {
 181                 unsigned int ts_usec;
 182                 unsigned int ts_nsec;
 183         };
 184 };
 185
 186 struct tpacket_hdr_v1 {
 187         __u32   block_status;
 188         __u32   num_pkts;
 189         __u32   offset_to_first_pkt;
 190
 191         /* Number of valid bytes (including padding)
 192          * blk_len <= tp_block_size
 193          */
 194         __u32   blk_len;
 195
 196         /*
 197          * Quite a few uses of sequence number:
 198          * 1. Make sure cache flush etc worked.
 199          *    Well, one can argue - why not use the increasing ts below?
 200          *    But look at 2. below first.
 201          * 2. When you pass around blocks to other user space decoders,
 202          *    you can see which blk[s] is[are] outstanding etc.
 203          * 3. Validate kernel code.
 204          */
 205         __aligned_u64   seq_num;
 206
 207         /*
 208          * ts_last_pkt:
 209          *
 210          * Case 1.      Block has 'N'(N >=1) packets and TMO'd(timed out)
 211          *              ts_last_pkt == 'time-stamp of last packet' and NOT the
 212          *              time when the timer fired and the block was closed.
 213          *              By providing the ts of the last packet we can absolutely
 214          *              guarantee that time-stamp wise, the first packet in the
 215          *              next block will never precede the last packet of the
 216          *              previous block.
 217          * Case 2.      Block has zero packets and TMO'd
 218          *              ts_last_pkt = time when the timer fired and the block
 219          *              was closed.
 220          * Case 3.      Block has 'N' packets and NO TMO.
 221          *              ts_last_pkt = time-stamp of the last pkt in the block.
 222          *
 223          * ts_first_pkt:
 224          *              Is always the time-stamp when the block was opened.
 225          *              Case a) ZERO packets
 226          *                      No packets to deal with but atleast you know the
 227          *                      time-interval of this block.
 228          *              Case b) Non-zero packets
 229          *                      Use the ts of the first packet in the block.
 230          *
 231          */
 232         struct tpacket_bd_ts    ts_first_pkt, ts_last_pkt;
 233 };
 234
 235 union tpacket_bd_header_u {
 236         struct tpacket_hdr_v1 bh1;
 237 };
 238
 239 struct tpacket_block_desc {
 240         __u32 version;
 241         __u32 offset_to_priv;
 242         union tpacket_bd_header_u hdr;
 243 };
 244
 245 #define TPACKET2_HDRLEN         (TPACKET_ALIGN(sizeof(struct tpacket2_hdr)) + sizeof(struct sockaddr_ll))
 246 #define TPACKET3_HDRLEN         (TPACKET_ALIGN(sizeof(struct tpacket3_hdr)) + sizeof(struct sockaddr_ll))
 247
 248 enum tpacket_versions {
 249         TPACKET_V1,
 250         TPACKET_V2,
 251         TPACKET_V3
 252 };
 253
 254 /*
 255    Frame structure:
 256
 257    - Start. Frame must be aligned to TPACKET_ALIGNMENT=16
 258    - struct tpacket_hdr
 259    - pad to TPACKET_ALIGNMENT=16
 260    - struct sockaddr_ll
 261    - Gap, chosen so that packet data (Start+tp_net) alignes to TPACKET_ALIGNMENT=16
 262    - Start+tp_mac: [ Optional MAC header ]
 263    - Start+tp_net: Packet data, aligned to TPACKET_ALIGNMENT=16.
 264    - Pad to align to TPACKET_ALIGNMENT=16
 265  */
 266
 267 struct tpacket_req {
 268         unsigned int    tp_block_size;  /* Minimal size of contiguous block */
 269         unsigned int    tp_block_nr;    /* Number of blocks */
 270         unsigned int    tp_frame_size;  /* Size of frame */
 271         unsigned int    tp_frame_nr;    /* Total number of frames */
 272 };
 273
 274 struct tpacket_req3 {
 275         unsigned int    tp_block_size;  /* Minimal size of contiguous block */
 276         unsigned int    tp_block_nr;    /* Number of blocks */
 277         unsigned int    tp_frame_size;  /* Size of frame */
 278         unsigned int    tp_frame_nr;    /* Total number of frames */
 279         unsigned int    tp_retire_blk_tov; /* timeout in msecs */
 280         unsigned int    tp_sizeof_priv; /* offset to private data area */
 281         unsigned int    tp_feature_req_word;
 282 };
 283
 284 union tpacket_req_u {
 285         struct tpacket_req      req;
 286         struct tpacket_req3     req3;
 287 };
 288
 289 struct packet_mreq {
 290         int             mr_ifindex;
 291         unsigned short  mr_type;
 292         unsigned short  mr_alen;
 293         unsigned char   mr_address[8];
 294 };
 295
 296 #define PACKET_MR_MULTICAST     0
 297 #define PACKET_MR_PROMISC       1
 298 #define PACKET_MR_ALLMULTI      2
 299 #define PACKET_MR_UNICAST       3
 300
 301 #endif