netfilter: nfnetlink_queue: assert monotonic packet ids

Packet identifier is currently setup in nfqnl_build_packet_message(),
using one atomic_inc_return().

Problem is that since several cpus might concurrently call
nfqnl_enqueue_packet() for the same queue, we can deliver packets to
consumer in non monotonic way (packet N+1 being delivered after packet
N)

This patch moves the packet id setup from nfqnl_build_packet_message()
to nfqnl_enqueue_packet() to guarantee correct delivery order.

This also removes one atomic operation.

Signed-off-by: Eric Dumazet <[email protected]>
CC: Florian Westphal <[email protected]>
CC: Pablo Neira Ayuso <[email protected]>
CC: Eric Leblond <[email protected]>
Signed-off-by: Patrick McHardy <[email protected]>

0 files changed, 0 insertions, 0 deletions