* Help required in a part of transport layer
@ 2019-07-12 6:21 Rakesh Beck
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From: Rakesh Beck @ 2019-07-12 6:21 UTC (permalink / raw)
To: netdev
Hi,
I am looking for some help.
I am trying to intercept packet using netfilter hooks
(NF_IP_LOCAL_OUT) and using source port and destination port from
SK_BUFF, to figure out which processes are using it but I am unable to
do so.
I am only concerned about packets which are sent and received locally.
Therefore, I looked into __udp4_lib_rcv (net/ipv4/udp.c) to see how
packet is assigned to socket and from socket to infer which process is
using it (For receiver). I called udp4_lib_lookup_skb from netfilter
hook but it causes kernel null pointer deference.
For sender, I was thinking to add sending process pid to sk_buff's secmark.
Is this the correct way to do or is there any other way? kindly point
me to resources which will help me achieve my goal.
Thanks,
Rakesh
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