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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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11
net/ipv6/udp.c
View file

@ -768,6 +768,15 @@ start_lookup:
return 0;
}
static void udp6_sk_rx_dst_set(struct sock *sk, struct dst_entry *dst)
{
if (udp_sk_rx_dst_set(sk, dst)) {
const struct rt6_info *rt = (const struct rt6_info *)dst;
inet6_sk(sk)->rx_dst_cookie = rt6_get_cookie(rt);
}
}
int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable,
int proto)
{
@ -817,7 +826,7 @@ int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable,
int ret;
if (unlikely(sk->sk_rx_dst != dst))
udp_sk_rx_dst_set(sk, dst);
udp6_sk_rx_dst_set(sk, dst);
ret = udpv6_queue_rcv_skb(sk, skb);
sock_put(sk);