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| Subject: | Re: Any way to automatically change arbitrary headers of IP packets on-the-fly? |
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| Date: | Thu, 14 Apr 2005 01:23:31 -0400 |
On Mon, 11 Apr 2005 19:39:25 -0300, =?ISO-8859-1?Q?Jo=E3o_Paulo_Caldas_Campello?= said:
I've already read Netfilter documentation (specially the "Linux netfilter Hacking HOWTO") so I know this kind of packet mangling can be done in userspace. I thought it could be done in the "MANGLE" table of netfilter, but I found no TARGET that achieves that nor any documentation about altering arbitrary IP headers.
Currently, iptables doesn't seem to support that, probably to keep you from shooting yourself in the foot. Consider for example how fast the kernel will fold up if you change that first nybble of the packet from an x'4' to an x'6' without changing the rest of the packet to match. Suddenly, that sk_buff is a lot too short.. ;)
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