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| author | Petar Penkov <peterpenkov96@gmail.com> | 2017-09-22 23:49:15 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-09-26 06:16:13 +0300 |
| commit | 90e33d45940793def6f773b2d528e9f3c84ffdc7 (patch) | |
| tree | b4052e153b19a3d3341a2f2e67465e4cdaba050d /include/uapi/linux/if_tun.h | |
| parent | 943170998b200190f99d3fe7e771437e2c51f319 (diff) | |
| download | linux-90e33d45940793def6f773b2d528e9f3c84ffdc7.tar.xz | |
tun: enable napi_gro_frags() for TUN/TAP driver
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>
Diffstat (limited to 'include/uapi/linux/if_tun.h')
| -rw-r--r-- | include/uapi/linux/if_tun.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/uapi/linux/if_tun.h b/include/uapi/linux/if_tun.h index 30b6184884eb..365ade5685c9 100644 --- a/include/uapi/linux/if_tun.h +++ b/include/uapi/linux/if_tun.h @@ -61,6 +61,7 @@ #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 |