90e33d4594
Add a TUN/TAP receive mode that exercises the napi_gro_frags() interface. This mode is available only in TAP mode, as the interface expects packets with Ethernet headers. Furthermore, packets follow the layout of the iovec_iter that was received. The first iovec is the linear data, and every one after the first is a fragment. If there are more fragments than the max number, drop the packet. Additionally, invoke eth_get_headlen() to exercise flow dissector code and to verify that the header resides in the linear data. The napi_gro_frags() mode requires setting the IFF_NAPI_FRAGS option. This is imposed because this mode is intended for testing via tools like syzkaller and packetdrill, and the increased flexibility it provides can introduce security vulnerabilities. This flag is accepted only if the device is in TAP mode and has the IFF_NAPI flag set as well. This is done because both of these are explicit requirements for correct operation in this mode. Signed-off-by: Petar Penkov <peterpenkov96@gmail.com> Cc: Eric Dumazet <edumazet@google.com> Cc: Mahesh Bandewar <maheshb@google.com> Cc: Willem de Bruijn <willemb@google.com> Cc: davem@davemloft.net Cc: ppenkov@stanford.edu Acked-by: Mahesh Bandewar <maheshb@google,com> Signed-off-by: David S. Miller <davem@davemloft.net>
109 lines
3.8 KiB
C
109 lines
3.8 KiB
C
/*
|
|
* 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 _UAPI__IF_TUN_H
|
|
#define _UAPI__IF_TUN_H
|
|
|
|
#include <linux/types.h>
|
|
#include <linux/if_ether.h>
|
|
#include <linux/filter.h>
|
|
|
|
/* Read queue size */
|
|
#define TUN_READQ_SIZE 500
|
|
/* TUN device type flags: deprecated. Use IFF_TUN/IFF_TAP instead. */
|
|
#define TUN_TUN_DEV IFF_TUN
|
|
#define TUN_TAP_DEV IFF_TAP
|
|
#define TUN_TYPE_MASK 0x000f
|
|
|
|
/* 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)
|
|
#define TUNSETLINK _IOW('T', 205, int)
|
|
#define TUNSETGROUP _IOW('T', 206, int)
|
|
#define TUNGETFEATURES _IOR('T', 207, unsigned int)
|
|
#define TUNSETOFFLOAD _IOW('T', 208, unsigned int)
|
|
#define TUNSETTXFILTER _IOW('T', 209, unsigned int)
|
|
#define TUNGETIFF _IOR('T', 210, unsigned int)
|
|
#define TUNGETSNDBUF _IOR('T', 211, int)
|
|
#define TUNSETSNDBUF _IOW('T', 212, int)
|
|
#define TUNATTACHFILTER _IOW('T', 213, struct sock_fprog)
|
|
#define TUNDETACHFILTER _IOW('T', 214, struct sock_fprog)
|
|
#define TUNGETVNETHDRSZ _IOR('T', 215, int)
|
|
#define TUNSETVNETHDRSZ _IOW('T', 216, int)
|
|
#define TUNSETQUEUE _IOW('T', 217, int)
|
|
#define TUNSETIFINDEX _IOW('T', 218, unsigned int)
|
|
#define TUNGETFILTER _IOR('T', 219, struct sock_fprog)
|
|
#define TUNSETVNETLE _IOW('T', 220, int)
|
|
#define TUNGETVNETLE _IOR('T', 221, int)
|
|
/* The TUNSETVNETBE and TUNGETVNETBE ioctls are for cross-endian support on
|
|
* little-endian hosts. Not all kernel configurations support them, but all
|
|
* configurations that support SET also support GET.
|
|
*/
|
|
#define TUNSETVNETBE _IOW('T', 222, int)
|
|
#define TUNGETVNETBE _IOR('T', 223, int)
|
|
|
|
/* TUNSETIFF ifr flags */
|
|
#define IFF_TUN 0x0001
|
|
#define IFF_TAP 0x0002
|
|
#define IFF_NAPI 0x0010
|
|
#define IFF_NAPI_FRAGS 0x0020
|
|
#define IFF_NO_PI 0x1000
|
|
/* This flag has no real effect */
|
|
#define IFF_ONE_QUEUE 0x2000
|
|
#define IFF_VNET_HDR 0x4000
|
|
#define IFF_TUN_EXCL 0x8000
|
|
#define IFF_MULTI_QUEUE 0x0100
|
|
#define IFF_ATTACH_QUEUE 0x0200
|
|
#define IFF_DETACH_QUEUE 0x0400
|
|
/* read-only flag */
|
|
#define IFF_PERSIST 0x0800
|
|
#define IFF_NOFILTER 0x1000
|
|
|
|
/* Socket options */
|
|
#define TUN_TX_TIMESTAMP 1
|
|
|
|
/* 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. */
|
|
#define TUN_F_UFO 0x10 /* I can handle UFO packets */
|
|
|
|
/* Protocol info prepended to the packets (when IFF_NO_PI is not set) */
|
|
#define TUN_PKT_STRIP 0x0001
|
|
struct tun_pi {
|
|
__u16 flags;
|
|
__be16 proto;
|
|
};
|
|
|
|
/*
|
|
* 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];
|
|
};
|
|
|
|
#endif /* _UAPI__IF_TUN_H */
|