Commit 4c16128b authored Oct 19, 2018 by Eric Dumazet Committed by David S. Miller Oct 20, 2018

net: loopback: clear skb->tstamp before netif_rx()



At least UDP / TCP stacks can now cook skbs with a tstamp using
MONOTONIC base (or arbitrary values with SCM_TXTIME)

Since loopback driver does not call (directly or indirectly)
skb_scrub_packet(), we need to clear skb->tstamp so that
net_timestamp_check() can eventually resample the time,
using ktime_get_real().

Fixes: 80b14dee ("net: Add a new socket option for a future transmit time.")
Fixes: fb420d5d ("tcp/fq: move back to CLOCK_MONOTONIC")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Willem de Bruijn <willemb@google.com>
Cc: Soheil Hassas Yeganeh <soheil@google.com>
Acked-by: Soheil Hassas Yeganeh <soheil@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent b5b4185c

drivers/net/loopback.c

+4 −0

Original line number	Diff line number	Diff line
		@@ -69,6 +69,10 @@ static netdev_tx_t loopback_xmit(struct sk_buff *skb,
		int len;

		skb_tx_timestamp(skb);

		/* do not fool net_timestamp_check() with various clock bases */
		skb->tstamp = 0;

		skb_orphan(skb);

		/* Before queueing this packet to netif_rx(),

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