2005-04-16 16:20:36 -06:00
|
|
|
/*
|
|
|
|
|
* Universal TUN/TAP device driver.
|
|
|
|
|
* Copyright (C) 1999-2000 Maxim Krasnyansky <max_mk@yahoo.com>
|
|
|
|
|
*
|
|
|
|
|
* This program is free software; you can redistribute it and/or modify
|
|
|
|
|
* it under the terms of the GNU General Public License as published by
|
|
|
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
|
|
|
* (at your option) any later version.
|
|
|
|
|
*
|
|
|
|
|
* This program is distributed in the hope that it will be useful,
|
|
|
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
|
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
|
|
|
* GNU General Public License for more details.
|
|
|
|
|
*/
|
|
|
|
|
|
|
|
|
|
#ifndef __IF_TUN_H
|
|
|
|
|
#define __IF_TUN_H
|
|
|
|
|
|
2007-12-22 10:52:42 -07:00
|
|
|
#include <linux/types.h>
|
2008-07-14 23:18:19 -06:00
|
|
|
#include <linux/if_ether.h>
|
2007-12-22 10:52:42 -07:00
|
|
|
|
2005-04-16 16:20:36 -06:00
|
|
|
/* Read queue size */
|
|
|
|
|
#define TUN_READQ_SIZE 500
|
|
|
|
|
|
|
|
|
|
/* TUN device flags */
|
|
|
|
|
#define TUN_TUN_DEV 0x0001
|
|
|
|
|
#define TUN_TAP_DEV 0x0002
|
|
|
|
|
#define TUN_TYPE_MASK 0x000f
|
|
|
|
|
|
|
|
|
|
#define TUN_FASYNC 0x0010
|
|
|
|
|
#define TUN_NOCHECKSUM 0x0020
|
|
|
|
|
#define TUN_NO_PI 0x0040
|
|
|
|
|
#define TUN_ONE_QUEUE 0x0080
|
|
|
|
|
#define TUN_PERSIST 0x0100
|
2008-07-03 04:48:02 -06:00
|
|
|
#define TUN_VNET_HDR 0x0200
|
2005-04-16 16:20:36 -06:00
|
|
|
|
|
|
|
|
/* Ioctl defines */
|
|
|
|
|
#define TUNSETNOCSUM _IOW('T', 200, int)
|
|
|
|
|
#define TUNSETDEBUG _IOW('T', 201, int)
|
|
|
|
|
#define TUNSETIFF _IOW('T', 202, int)
|
|
|
|
|
#define TUNSETPERSIST _IOW('T', 203, int)
|
|
|
|
|
#define TUNSETOWNER _IOW('T', 204, int)
|
2005-09-01 18:40:05 -06:00
|
|
|
#define TUNSETLINK _IOW('T', 205, int)
|
2007-07-02 23:50:25 -06:00
|
|
|
#define TUNSETGROUP _IOW('T', 206, int)
|
tun: Interface to query tun/tap features.
The problem with introducing checksum offload and gso to tun is they
need to set dev->features to enable GSO and/or checksumming, which is
supposed to be done before register_netdevice(), ie. as part of
TUNSETIFF.
Unfortunately, TUNSETIFF has always just ignored flags it doesn't
understand, so there's no good way of detecting whether the kernel
supports new IFF_ flags.
This patch implements a TUNGETFEATURES ioctl which returns all the valid IFF
flags. It could be extended later to include other features.
Here's an example program which uses it:
#include <linux/if_tun.h>
#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <err.h>
#include <stdio.h>
static struct {
unsigned int flag;
const char *name;
} known_flags[] = {
{ IFF_TUN, "TUN" },
{ IFF_TAP, "TAP" },
{ IFF_NO_PI, "NO_PI" },
{ IFF_ONE_QUEUE, "ONE_QUEUE" },
};
int main()
{
unsigned int features, i;
int netfd = open("/dev/net/tun", O_RDWR);
if (netfd < 0)
err(1, "Opening /dev/net/tun");
if (ioctl(netfd, TUNGETFEATURES, &features) != 0) {
printf("Kernel does not support TUNGETFEATURES, guessing\n");
features = (IFF_TUN|IFF_TAP|IFF_NO_PI|IFF_ONE_QUEUE);
}
printf("Available features are: ");
for (i = 0; i < sizeof(known_flags)/sizeof(known_flags[0]); i++) {
if (features & known_flags[i].flag) {
features &= ~known_flags[i].flag;
printf("%s ", known_flags[i].name);
}
}
if (features)
printf("(UNKNOWN %#x)", features);
printf("\n");
return 0;
}
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Acked-by: Max Krasnyansky <maxk@qualcomm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2008-07-03 04:45:32 -06:00
|
|
|
#define TUNGETFEATURES _IOR('T', 207, unsigned int)
|
2008-07-14 23:18:19 -06:00
|
|
|
#define TUNSETOFFLOAD _IOW('T', 208, unsigned int)
|
|
|
|
|
#define TUNSETTXFILTER _IOW('T', 209, unsigned int)
|
2008-08-15 16:09:56 -06:00
|
|
|
#define TUNGETIFF _IOR('T', 210, unsigned int)
|
2009-02-05 22:25:32 -07:00
|
|
|
#define TUNGETSNDBUF _IOR('T', 211, int)
|
|
|
|
|
#define TUNSETSNDBUF _IOW('T', 212, int)
|
2005-04-16 16:20:36 -06:00
|
|
|
|
|
|
|
|
/* TUNSETIFF ifr flags */
|
|
|
|
|
#define IFF_TUN 0x0001
|
|
|
|
|
#define IFF_TAP 0x0002
|
|
|
|
|
#define IFF_NO_PI 0x1000
|
|
|
|
|
#define IFF_ONE_QUEUE 0x2000
|
2008-07-03 04:48:02 -06:00
|
|
|
#define IFF_VNET_HDR 0x4000
|
2009-04-27 04:23:54 -06:00
|
|
|
#define IFF_TUN_EXCL 0x8000
|
2005-04-16 16:20:36 -06:00
|
|
|
|
2008-07-03 04:46:16 -06:00
|
|
|
/* Features for GSO (TUNSETOFFLOAD). */
|
|
|
|
|
#define TUN_F_CSUM 0x01 /* You can hand me unchecksummed packets. */
|
|
|
|
|
#define TUN_F_TSO4 0x02 /* I can handle TSO for IPv4 packets */
|
|
|
|
|
#define TUN_F_TSO6 0x04 /* I can handle TSO for IPv6 packets */
|
|
|
|
|
#define TUN_F_TSO_ECN 0x08 /* I can handle TSO with ECN bits. */
|
2009-07-14 08:21:04 -06:00
|
|
|
#define TUN_F_UFO 0x10 /* I can handle UFO packets */
|
2008-07-03 04:46:16 -06:00
|
|
|
|
2008-07-14 23:18:19 -06:00
|
|
|
/* Protocol info prepended to the packets (when IFF_NO_PI is not set) */
|
|
|
|
|
#define TUN_PKT_STRIP 0x0001
|
2005-04-16 16:20:36 -06:00
|
|
|
struct tun_pi {
|
2008-07-14 23:18:19 -06:00
|
|
|
__u16 flags;
|
2007-12-22 10:52:42 -07:00
|
|
|
__be16 proto;
|
2005-04-16 16:20:36 -06:00
|
|
|
};
|
2008-07-14 23:18:19 -06:00
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* Filter spec (used for SETXXFILTER ioctls)
|
|
|
|
|
* This stuff is applicable only to the TAP (Ethernet) devices.
|
|
|
|
|
* If the count is zero the filter is disabled and the driver accepts
|
|
|
|
|
* all packets (promisc mode).
|
|
|
|
|
* If the filter is enabled in order to accept broadcast packets
|
|
|
|
|
* broadcast addr must be explicitly included in the addr list.
|
|
|
|
|
*/
|
|
|
|
|
#define TUN_FLT_ALLMULTI 0x0001 /* Accept all multicast packets */
|
|
|
|
|
struct tun_filter {
|
|
|
|
|
__u16 flags; /* TUN_FLT_ flags see above */
|
|
|
|
|
__u16 count; /* Number of addresses */
|
|
|
|
|
__u8 addr[0][ETH_ALEN];
|
|
|
|
|
};
|
2005-04-16 16:20:36 -06:00
|
|
|
|
|
|
|
|
#endif /* __IF_TUN_H */
|