Date: Thu, 3 Feb 2022 14:40:21 +0100 From: Franco Fichtner <franco@opnsense.org> To: freebsd-net@freebsd.org Subject: dhclient VLAN 0 decapsulation Message-ID: <B42110A7-B806-4144-8627-CE17C927F09A@opnsense.org>
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--Apple-Mail=_69306099-D6D7-4653-B9E7-9CEE2578B585 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii Hi all, We've been working on VLAN 0 decapsulation for dhclient last year and = would like a wider audience for the proposed change at = https://reviews.freebsd.org/D31515 <https://reviews.freebsd.org/D31515>; Basically what is being done is extend the BPF read filter program to = parse an optional VLAN tag if found and skipped over when the priority is zero. The write = side does not require any changes as the server can read the packet without the = priority tag inserted. The code has been deployed in two OPNsense releases and is being used = out in the wild as some ISPs send VLAN-0 wrapped responses to DHCP requests = which will not be seen by the client without said patch. All functional and technical feedback is welcome. Cheers, Franco= --Apple-Mail=_69306099-D6D7-4653-B9E7-9CEE2578B585 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=us-ascii <html><head><meta http-equiv=3D"Content-Type" content=3D"text/html; = charset=3Dus-ascii"></head><body style=3D"word-wrap: break-word; = -webkit-nbsp-mode: space; line-break: after-white-space;" class=3D"">Hi = all,<div class=3D""><br class=3D""></div><div class=3D"">We've been = working on VLAN 0 decapsulation for dhclient last year and would = like</div><div class=3D"">a wider audience for the proposed change = at <a href=3D"https://reviews.freebsd.org/D31515" = class=3D"">https://reviews.freebsd.org/D31515</a></div><div class=3D""><br= class=3D""></div><div class=3D"">Basically what is being done is extend = the BPF read filter program to parse an optional</div><div class=3D"">VLAN= tag if found and skipped over when the priority is zero. The write side = does not</div><div class=3D"">require any changes as the server can read = the packet without the priority tag inserted.</div><div class=3D""><br = class=3D""></div><div class=3D"">The code has been deployed in two = OPNsense releases and is being used out in</div><div class=3D"">the wild = as some ISPs send VLAN-0 wrapped responses to DHCP requests = which</div><div class=3D"">will not be seen by the client without said = patch.</div><div class=3D""><br class=3D""></div><div class=3D"">All = functional and technical feedback is welcome.</div><div class=3D""><br = class=3D""></div><div class=3D""><br class=3D""></div><div = class=3D"">Cheers,</div><div class=3D"">Franco</div></body></html>= --Apple-Mail=_69306099-D6D7-4653-B9E7-9CEE2578B585--
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