From: Florian Westphal <fw@strlen.de>
To: Psyspy rambo <psyspy2020@gmail.com>
Cc: Gordon Fisher <gordfisherman@gmail.com>, netfilter@vger.kernel.org
Subject: Re: Netfilter hook doesn't see all packets
Date: Thu, 21 Nov 2019 21:36:24 +0100 [thread overview]
Message-ID: <20191121203624.GK20235@breakpoint.cc> (raw)
In-Reply-To: <CAFqmWq_FNTL4p1i=Ur7V2vbjv=KUOer5Ar+J4owoNbpO_KBCOg@mail.gmail.com>
Psyspy rambo <psyspy2020@gmail.com> 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.
next prev parent reply other threads:[~2019-11-21 20:36 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-14 20:23 Netfilter hook doesn't see all packets Psyspy rambo
2019-11-20 18:01 ` Psyspy rambo
2019-11-21 18:08 ` Gordon Fisher
2019-11-21 19:36 ` Psyspy rambo
2019-11-21 20:36 ` Florian Westphal [this message]
2019-11-21 22:31 ` Psyspy rambo
2019-11-21 23:39 ` Psyspy rambo
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