From: John Fastabend <john.fastabend@gmail.com>
To: P K <pkopensrc@gmail.com>, bpf@vger.kernel.org
Subject: RE: Need help in tracing nf_nat kprobe
Date: Tue, 02 Jan 2024 15:25:12 -0800 [thread overview]
Message-ID: <65949b58d9a1a_11e86208cc@john.notmuch> (raw)
In-Reply-To: <CAL0j0DFrjP=y2TMCmsFr7yYL+dxZ7oJTc49_1WUj-YvK-78kMw@mail.gmail.com>
P K wrote:
> Hi,
>
> I want to track the Source IP for outgoing packets which are
> masqueraded via iptables in Linux kernel while routing the packet to
> destination.
>
> I was using kprobe for nf_nat_ipv4_manip_pkt for the same but which is
> not working anymore in the latest kernel 6.1.66-1 onwards.
>
> What would be the best way to do the same in bpf or kprobe?
>
Why is it not working anymore. Presumably because the function
was removed or maybe got inlined in newer kernels. Either way
looking for a similar function on 6.1.+ would be one answer.
Perhaps a more stable approach would be ot use the sock ops
hooks. I would just grep for sockops in ./tools/testing/sefltests/bpf/
to see examples on how to do this.
Thanks,
John
prev parent reply other threads:[~2024-01-02 23:25 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-01-02 11:14 Need help in tracing nf_nat kprobe P K
2024-01-02 23:25 ` John Fastabend [this message]
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