net/tap-linux.h

   1 /*
   2  *  Universal TUN/TAP device driver.
   3  *  Copyright (C) 1999-2000 Maxim Krasnyansky <max_mk@yahoo.com>
   4  *
   5  *  This program is free software; you can redistribute it and/or modify
   6  *  it under the terms of the GNU General Public License as published by
   7  *  the Free Software Foundation; either version 2 of the License, or
   8  *  (at your option) any later version.
   9  *
  10  *  This program is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  *  GNU General Public License for more details.
  14  */
  15
  16 #ifndef QEMU_TAP_H
  17 #define QEMU_TAP_H
  18
  19 #include <stdint.h>
  20 #ifdef __linux__
  21
  22 #include <linux/ioctl.h>
  23
  24 /* Ioctl defines */
  25 #define TUNSETIFF     _IOW('T', 202, int)
  26 #define TUNGETFEATURES _IOR('T', 207, unsigned int)
  27 #define TUNSETOFFLOAD  _IOW('T', 208, unsigned int)
  28 #define TUNGETIFF      _IOR('T', 210, unsigned int)
  29 #define TUNSETSNDBUF   _IOW('T', 212, int)
  30 #define TUNGETVNETHDRSZ _IOR('T', 215, int)
  31 #define TUNSETVNETHDRSZ _IOW('T', 216, int)
  32
  33 #endif
  34
  35 /* TUNSETIFF ifr flags */
  36 #define IFF_TAP         0x0002
  37 #define IFF_NO_PI       0x1000
  38 #define IFF_VNET_HDR    0x4000
  39
  40 /* Features for GSO (TUNSETOFFLOAD). */
  41 #define TUN_F_CSUM      0x01    /* You can hand me unchecksummed packets. */
  42 #define TUN_F_TSO4      0x02    /* I can handle TSO for IPv4 packets */
  43 #define TUN_F_TSO6      0x04    /* I can handle TSO for IPv6 packets */
  44 #define TUN_F_TSO_ECN   0x08    /* I can handle TSO with ECN bits. */
  45 #define TUN_F_UFO       0x10    /* I can handle UFO packets */
  46
  47 struct virtio_net_hdr
  48 {
  49     uint8_t flags;
  50     uint8_t gso_type;
  51     uint16_t hdr_len;
  52     uint16_t gso_size;
  53     uint16_t csum_start;
  54     uint16_t csum_offset;
  55 };
  56
  57 struct virtio_net_hdr_mrg_rxbuf
  58 {
  59     struct virtio_net_hdr hdr;
  60     uint16_t num_buffers;   /* Number of merged rx buffers */
  61 };
  62
  63 #endif /* QEMU_TAP_H */