[EMAIL PROTECTED] wrote:
Hello all,
I'm writing a kernel module which intercepts incoming
IP packets and reads information from a custom header.
The information contained in "My header" is passed to
userspace via netlink. So userspace builds up a picture
of the current network state, neighbouring nodes etc.....
I've inserted this custom header at the hook NF_IP_LOCAL_OUT
in each outgoing IP packet.At the moment I'm just populating
it with temporary data.
So my outgoing packets look like
[Mac hdr][IP hdr][My header][Data]
I'm wondering whats the best way for the kernel to communicate with
userspace at the NF_IP_LOCAL_OUT hook so it can populate
[My header] with the latest information from userspace???
So i'm looking to do something like
1. Kernel at NF_IP_LOCAL_OUT, I've got a new packet!
2. Kernel -> Userspace what information should I put in [My Header]? 3.
Userspace -> Kernel Heres my current view of the network
4. Kernel Populates My header and returns NF_ACCEPT
ip_queue is meant for this, it passes the entire packet to userspace and
lets you reinject it after doing your modifications.
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