Commit adcb5ad1 authored by Patrick McHardy's avatar Patrick McHardy Committed by David S. Miller
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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: default avatarPatrick McHardy <>
Signed-off-by: default avatarDavid S. Miller <>
parent cd0bf2d7
......@@ -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 - 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);
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