How can I add data to a packet before sending it?

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From: Akshay Kawale <linux781@gmail.com>
To: netfilter@lists.netfilter.org
Subject: How can I add data to a packet before sending it?
Date: Sat, 2 Apr 2005 21:03:19 -0500	[thread overview]
Message-ID: <72252ed0504021803e5b298@mail.gmail.com> (raw)

Hi,

I am trying to add data to a packet by expanding the tailroom using
skb_copy_expand()

I am using the following statements:
*skb = skb_copy_expand(*skb, 0, 256, GFP_ATOMIC);

I am calling this in the NF_IP_LOCAL_OUT hook, and does not give any
errors if I drop the packet in the NF_IP_POST_ROUTING hook.

However if I don't drop the packet, I get a kernel panic.

I am running Fedora Core 1.
Please let me know how I can achieve this.

Thanks.

- Akshay

                 reply	other threads:[~2005-04-03  2:03 UTC|newest]

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