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bpf: Clear skb->tstamp in bpf_redirect when necessary

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[ Upstream commit 5133498f4ad1123a5ffd4c08df6431dab882cc32 ]

Redirecting a packet from ingress to egress by using bpf_redirect
breaks if the egress interface has an fq qdisc installed. This is the same
problem as fixed in 'commit 8203e2d844d3 ("net: clear skb->tstamp in forwarding paths")

Clear skb->tstamp when redirecting into the egress path.

Fixes: 80b14dee2b ("net: Add a new socket option for a future transmit time.")
Fixes: fb420d5d91c1 ("tcp/fq: move back to CLOCK_MONOTONIC")
Signed-off-by: Lorenz Bauer <lmb@cloudflare.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Link: https://lore.kernel.org/bpf/20191213180817.2510-1-lmb@cloudflare.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Lorenz Bauer 2019-12-13 18:08:17 +00:00 • committed by Greg Kroah-Hartman
commit e3d5f12b31
1 changed files with 1 additions and 0 deletions
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1
net/core/filter.c
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@ -2007,6 +2007,7 @@ static inline int __bpf_tx_skb(struct net_device *dev, struct sk_buff *skb)
}
skb->dev = dev;
skb->tstamp = 0;
__this_cpu_inc(xmit_recursion);
ret = dev_queue_xmit(skb);