Bug 258334

Summary:	802.1ad ethertype lost
Product:	Base System	Reporter:	Lutz Donnerhacke <donner>
Component:	kern	Assignee:	Lutz Donnerhacke <donner>
Status:	New ---
Severity:	Affects Some People	CC:	net
Priority:	---	Flags:	donner: maintainer-feedback- donner: mfc-stable13? donner: mfc-stable12- donner: mfc-stable11-
Version:	13.0-STABLE
Hardware:	Any
OS:	Any

Description Lutz Donnerhacke freebsd_committer

2021-09-07 08:18:34 UTC

During input processing of received frames, the commit c7cffd65c5d858425e90b847d2e8e583e3b13bf7 (D26436) introduced a generalized processing von 802.1q and 802.1ad frames by replacing the VLAN header by mbuf meta data.

Unfortunately the ethertype of the original frame is lost. So if the frame is processed by other kernel routines later (i.e. netgraph), 802.1ad frames will be indistinguishable from 802.1q frames.

In my case this breaks further processing.

Comment 1 Lutz Donnerhacke freebsd_committer

2021-09-07 08:30:41 UTC

Quick fix in https://reviews.freebsd.org/D31871