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[IPV4]: Fix "Proxy ARP seems broken"

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Meelis Roos <mroos@linux.ee> wrote:
> RK> My firewall setup relies on proxyarp working.  However, with 2.6.14-rc3,
> RK> it appears to be completely broken.  The firewall is 212.18.232.186,
> 
> Same here with some kernel between 14-rc2 and 14-rc3 - no reposnse to
> ARP on a proxyarp gateway. Sorry, no exact revison and no more debugging
> yet since it'a a production gateway.

The breakage is caused by the change to use the CB area for flagging
whether a packet has been queued due to proxy_delay.  This area gets
cleared every time arp_rcv gets called.  Unfortunately packets delayed
due to proxy_delay also go through arp_rcv when they are reprocessed.

In fact, I can't think of a reason why delayed proxy packets should go
through netfilter again at all.  So the easiest solution is to bypass
that and go straight to arp_process.

This is essentially what would've happened before netfilter support
was added to ARP.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> 
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Herbert Xu 2005-10-03 14:18:10 -07:00 committed by David S. Miller
parent 496a22b08f
commit 444fc8fc3a
1 changed files with 5 additions and 6 deletions
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11
net/ipv4/arp.c
View File

@ -697,12 +697,6 @@ void arp_send(int type, int ptype, u32 dest_ip,
arp_xmit(skb);
}
static void parp_redo(struct sk_buff *skb)
{
nf_reset(skb);
arp_rcv(skb, skb->dev, NULL, skb->dev);
}
/*
* Process an arp request.
*/
@ -922,6 +916,11 @@ out:
return 0;
}
static void parp_redo(struct sk_buff *skb)
{
arp_process(skb);
}
/*
* Receive an arp request from the device layer.