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[NETFILTER]: Fix DHCP + MASQUERADE problem

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In 2.6.13-rcX the MASQUERADE target was changed not to exclude local
packets for better source address consistency. This breaks DHCP clients
using UDP sockets when the DHCP requests are caught by a MASQUERADE rule
because the MASQUERADE target drops packets when no address is configured
on the outgoing interface. This patch makes it ignore packets with a
source address of 0.

Thanks to Rusty for this suggestion.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Patrick McHardy 2005-09-13 13:49:15 -07:00 committed by David S. Miller
parent cd0bf2d796
commit adcb5ad1e5
1 changed files with 6 additions and 0 deletions
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6
net/ipv4/netfilter/ipt_MASQUERADE.c
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@ -90,6 +90,12 @@ masquerade_target(struct sk_buff **pskb,
IP_NF_ASSERT(ct && (ctinfo == IP_CT_NEW || ctinfo == IP_CT_RELATED
|| ctinfo == IP_CT_RELATED + IP_CT_IS_REPLY));
/* Source address is 0.0.0.0 - locally generated packet that is
* probably not supposed to be masqueraded.
*/
if (ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.ip == 0)
return NF_ACCEPT;
mr = targinfo;
rt = (struct rtable *)(*pskb)->dst;
newsrc = inet_select_addr(out, rt->rt_gateway, RT_SCOPE_UNIVERSE);