[PATCH net v1 0/3] af_packet/tcp: fix late hardware timestamp handling

[Kohei Enju <kohei@enjuk.jp>]

Since commit 97dc7cd92ac6 ("ptp: Support late timestamp determination"),
skb_shared_hwtstamps may carry netdev_data instead of a resolved
hwtstamp. AF_PACKET and TCP could still read that storage as a ktime_t
and report bogus hardware timestamps to userspace.

This series factors the late timestamp resolution logic into a common
helper, then switches AF_PACKET and TCP to use it.

Notes on SOF_TIMESTAMPING_BIND_PHC:
The generic socket receive timestamping path honors it, but the
AF_PACKET and TCP receive paths touched here haven't implemented that
behavior.
This series doesn't change that; those paths always resolve timestamps
with cycles == false and preserve their timestamp-domain semantics.

Kohei Enju (3):
  net: introduce helper to resolve hardware timestamps from skb
  af_packet: use skb_get_hwtstamp() for hardware timestamps
  tcp: use skb_get_hwtstamp() for hardware timestamps

 include/linux/skbuff.h | 11 +++++++++++
 include/net/tcp.h      |  2 +-
 net/core/skbuff.c      | 27 +++++++++++++++++++++++++++
 net/ipv4/tcp_input.c   |  3 ++-
 net/ipv4/tcp_ipv4.c    |  6 ++++--
 net/ipv6/tcp_ipv6.c    |  3 ++-
 net/packet/af_packet.c |  2 +-
 net/socket.c           | 27 +++------------------------
 8 files changed, 51 insertions(+), 30 deletions(-)

-- 
2.53.0