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Subject[PATCH bpf] bpf: clear skb->tstamp in bpf_redirect when necessary
Date
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 8203e2d8 ("net: clear skb->tstamp in forwarding paths").

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

Fixes: 80b14de ("net: Add a new socket option for a future transmit time.")
Fixes: fb420d5 ("tcp/fq: move back to CLOCK_MONOTONIC")
Signed-off-by: Lorenz Bauer <lmb@cloudflare.com>
---
net/core/filter.c | 1 +
1 file changed, 1 insertion(+)

diff --git a/net/core/filter.c b/net/core/filter.c
index f1e703eed3d2..d914257763b5 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -2055,6 +2055,7 @@ static inline int __bpf_tx_skb(struct net_device *dev, struct sk_buff *skb)
}

skb->dev = dev;
+ skb->tstamp = 0;

dev_xmit_recursion_inc();
ret = dev_queue_xmit(skb);
--
2.20.1
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