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| author | Patrick McHardy <kaber@trash.net> | 2005-09-13 13:49:15 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2005-09-13 13:49:15 -0700 |
| commit | adcb5ad1e5ba3996d53a047c5486efa6e734b413 (patch) | |
| tree | 6275dbf6331366bff32bf3d67b44b991f20ed36f | |
| parent | cd0bf2d796ebb51c346b1ed4208cdbfd86e98a61 (diff) | |
| download | linux-3.10-adcb5ad1e5ba3996d53a047c5486efa6e734b413.tar.gz linux-3.10-adcb5ad1e5ba3996d53a047c5486efa6e734b413.tar.bz2 linux-3.10-adcb5ad1e5ba3996d53a047c5486efa6e734b413.zip | |
[NETFILTER]: Fix DHCP + MASQUERADE problem
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>
| -rw-r--r-- | net/ipv4/netfilter/ipt_MASQUERADE.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/net/ipv4/netfilter/ipt_MASQUERADE.c b/net/ipv4/netfilter/ipt_MASQUERADE.c index 2f3e181c8e9..275a174c6fe 100644 --- a/net/ipv4/netfilter/ipt_MASQUERADE.c +++ b/net/ipv4/netfilter/ipt_MASQUERADE.c @@ -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); |