Re: Netfilter hook doesn't see all packets

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Subject: Re: Netfilter hook doesn't see all packets
From: Florian Westphal <fw@xxxxxxxxx>
Date: Thu, 21 Nov 2019 21:36:24 +0100
Cc: Gordon Fisher <gordfisherman@xxxxxxxxx>, netfilter@xxxxxxxxxxxxxxx
In-reply-to: <CAFqmWq_FNTL4p1i=Ur7V2vbjv=KUOer5Ar+J4owoNbpO_KBCOg@mail.gmail.com>
References: <CAFqmWq_+GgO3uiu6omDxiUPiiV5OcJ9d6A--RHC3-jZCy_sV0A@mail.gmail.com> <CAFqmWq_Ha3ces2AAnU_s-Dzbxv7g-pGE4ikg-+HGGq-WNX=gow@mail.gmail.com> <5DD6D297.8010609@gmail.com> <CAFqmWq_FNTL4p1i=Ur7V2vbjv=KUOer5Ar+J4owoNbpO_KBCOg@mail.gmail.com>
User-agent: Mutt/1.10.1 (2018-07-13)

Psyspy rambo <psyspy2020@xxxxxxxxx> wrote:
> > >      udp_header = (struct udphdr *)skb_transport_header(skb);
> > >      sip = (unsigned int)ntohl(ip_header->saddr);
> > >      dip = (unsigned int)ntohl(ip_header->daddr);

This doesn't work reliably in netfilter hooks.

See skb_header_pointer() usage in other nf modules.

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