Transmit time stamping on tun/tap interfaces

This series adds transmit SO_TIMESTAMPING for tun and tap devices. Having this support is useful for testing multiple instances of PTP programs (for example, to exercise the best master clock behavior) and for synchronizing virtual guests.

The first patch refactors the code that delivers raw error queue packets into a common function, in order to avoid multiple, nearly identical implementations. This can be used whenever a network layer has an error queue for transmit time stamp reporting only.

Thanks,
Richard

Richard Cochran (2):
Provide a generic socket error queue delivery method for Tx time
stamps.
tun: Support software transmit time stamping.

 drivers/net/tun.c           |   14 +++++++++++--
 include/net/sock.h          |    2 ++
 include/uapi/linux/if_tun.h |    3 +++
 net/core/sock.c             |   47 ++++++++++++++++++++++++++++++++++++++++++
 net/packet/af_packet.c      |   48 ++-----------------------------------------
 5 files changed, 66 insertions(+), 48 deletions(-)

1.7.10.4