From: Pablo Neira Ayuso <pablo@netfilter.org>
To: Willem de Bruijn <willemdebruijn.kernel@gmail.com>
Cc: netfilter-devel@vger.kernel.org, blaffablaffa@gmail.com,
Willem de Bruijn <willemb@google.com>
Subject: Re: [PATCH netfilter] extensions/libxt_bpf.man: clarify BPF code generation with tcpdump
Date: Fri, 12 Aug 2016 12:47:06 +0200 [thread overview]
Message-ID: <20160812104706.GA3991@salvia> (raw)
In-Reply-To: <1470856987-101558-1-git-send-email-willemdebruijn.kernel@gmail.com>
On Wed, Aug 10, 2016 at 03:23:07PM -0400, Willem de Bruijn wrote:
> From: Willem de Bruijn <willemb@google.com>
>
> The xt_bpf module applies BPF bytecode to the packet. Depending on
> where the module is invoked, the kernel may pass a packet with or
> without link layer header. Iptables has no such header.
>
> A common `tcpdump -ddd <string>` compilation command may revert to
> a physical device that generates code for packets starting from the
> mac layer up (e.g., E10MB data link type: Ethernet).
>
> Clarify in the man page that when using this tool for code generation,
> a suitable target device must be chosen.
>
> Netfilter Bugzilla Bug #1048
Applied, thanks.
prev parent reply other threads:[~2016-08-12 10:47 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-08-10 19:23 [PATCH netfilter] extensions/libxt_bpf.man: clarify BPF code generation with tcpdump Willem de Bruijn
2016-08-12 10:47 ` Pablo Neira Ayuso [this message]
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