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Revert "ipv4: tcp: dont cache unconfirmed intput dst"

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This reverts commit c074da2810.

This change has several unwanted side effects:

1) Sockets will cache the DST_NOCACHE route in sk->sk_rx_dst and we'll
   thus never create a real cached route.

2) All TCP traffic will use DST_NOCACHE and never use the routing
   cache at all.

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller
2012-06-27 17:05:06 -07:00
parent e440cf2ca0
commit c10237e077
9 changed files with 15 additions and 20 deletions
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5
net/ipv4/ip_input.c
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@@ -326,7 +326,6 @@ static int ip_rcv_finish(struct sk_buff *skb)
*/
if (skb_dst(skb) == NULL) {
int err = -ENOENT;
bool nocache = false;
if (sysctl_ip_early_demux) {
const struct net_protocol *ipprot;
@@ -335,13 +334,13 @@ static int ip_rcv_finish(struct sk_buff *skb)
rcu_read_lock();
ipprot = rcu_dereference(inet_protos[protocol]);
if (ipprot && ipprot->early_demux)
err = ipprot->early_demux(skb, &nocache);
err = ipprot->early_demux(skb);
rcu_read_unlock();
}
if (err) {
err = ip_route_input_noref(skb, iph->daddr, iph->saddr,
iph->tos, skb->dev, nocache);
iph->tos, skb->dev);
if (unlikely(err)) {
if (err == -EXDEV)
NET_INC_STATS_BH(dev_net(skb->dev),