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udp6: set rx_dst_cookie on rx_dst updates

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Currently, in the udp6 code, the dst cookie is not initialized/updated
concurrently with the RX dst used by early demux.

As a result, the dst_check() in the early_demux path always fails,
the rx dst cache is always invalidated, and we can't really
leverage significant gain from the demux lookup.

Fix it adding udp6 specific variant of sk_rx_dst_set() and use it
to set the dst cookie when the dst entry is really changed.

The issue is there since the introduction of early demux for ipv6.

Fixes: 5425077d73 ("net: ipv6: Add early demux handler for UDP unicast")
Acked-by: Hannes Frederic Sowa <[email protected]>
Signed-off-by: Paolo Abeni <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Paolo Abeni 2017-08-25 14:31:01 +02:00 • committed by David S. Miller
commit 64f0f5d18a
3 changed files with 14 additions and 3 deletions
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4
net/ipv4/udp.c
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@ -1929,14 +1929,16 @@ drop:
/* For TCP sockets, sk_rx_dst is protected by socket lock
* For UDP, we use xchg() to guard against concurrent changes.
*/
void udp_sk_rx_dst_set(struct sock *sk, struct dst_entry *dst)
bool udp_sk_rx_dst_set(struct sock *sk, struct dst_entry *dst)
{
struct dst_entry *old;
if (dst_hold_safe(dst)) {
old = xchg(&sk->sk_rx_dst, dst);
dst_release(old);
return old != dst;
}
return false;
}
EXPORT_SYMBOL(udp_sk_rx_dst_set);