8e0f8e5bf8
For now, we just add an empty header before writing and strip the header after reading. We really only want IFF_VNET_HDR when virtio_net is using it, but it would significantly complicate matters to try and do that. There should be little or no performance impact with always adding headers. Signed-off-by: Mark McLoughlin <markmc@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
44 lines
1.2 KiB
C
44 lines
1.2 KiB
C
/*
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* Universal TUN/TAP device driver.
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* Copyright (C) 1999-2000 Maxim Krasnyansky <max_mk@yahoo.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#ifndef QEMU_TAP_H
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#define QEMU_TAP_H
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#include <stdint.h>
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#include <linux/ioctl.h>
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/* Ioctl defines */
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#define TUNSETIFF _IOW('T', 202, int)
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#define TUNGETFEATURES _IOR('T', 207, unsigned int)
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#define TUNGETIFF _IOR('T', 210, unsigned int)
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#define TUNSETSNDBUF _IOW('T', 212, int)
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/* TUNSETIFF ifr flags */
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#define IFF_TAP 0x0002
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#define IFF_NO_PI 0x1000
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#define IFF_VNET_HDR 0x4000
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struct virtio_net_hdr
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{
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uint8_t flags;
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uint8_t gso_type;
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uint16_t hdr_len;
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uint16_t gso_size;
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uint16_t csum_start;
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uint16_t csum_offset;
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};
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#endif /* QEMU_TAP_H */
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