I tracked down the function responsible for changing the MAC header. It is skb_vlan_untag() called from __allowed_ingress() in net/bridge/br_vlan.c. Before skb_vlan_untag() is called, the MAC headers are perfect and afterward they are altered as previously described. I'll continue digging into that function, but if any of you have insight into what skb_vlan_untag() does and why it might alter the MAC header the way it does in this special case, I would appreciate the help.
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