Date: Sat, 09 Nov 2013 03:40:34 -0330 From: Bear <jilingshu@gmail.com> To: Gleb Smirnoff <glebius@FreeBSD.org> Cc: freebsd-net@freebsd.org Subject: Re: ng_patch and 802.11Q Message-ID: <527DDFEA.9050001@Gmail.com> In-Reply-To: <20131108215210.GH7577@FreeBSD.org> References: <527C799D.8020208@Gmail.com> <20131108215210.GH7577@FreeBSD.org>
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Hi, It seems a good idea... Do you have some example working on ng_ether? The manpage of ng_ether seems no example... On 11/8/2013 6:22 PM, Gleb Smirnoff wrote: > On Fri, Nov 08, 2013 at 02:11:49AM -0330, Bear wrote: > B> Hi all, > B> I want to modify VLAN priority by ng_patch. After reading the manpage of > B> ng_patch(http://www.freebsd.org/cgi/man.cgi?query=ng_patch) and the > B> example it given: > B> > B> > /usr/sbin/ngctl -f- <<-SEQ > B> > mkpeer ipfw: patch 200 in > B> > name ipfw:200 ttl_add > B> > msg ttl_add: setconfig { count=1 csum_flags=1 ops=[ \ > B> > { mode=2 value=3 length=1 offset=8 } ] } > B> > SEQ > B> > /sbin/ipfw add 150 netgraph 200 ip from any to simplex.remote.net > B> > B> It seems ng_patch can only modify IP header. However, the position of > B> VLAN header is before IP header and after Ethernet header. How can I > B> modify it? > > ipfw allows you to intercept packets at IP layer. Tp modify VLAN header, > you need to capture them earlier. May be ng_ether(4) will help you. >
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