XPost: linux.debian.kernel   
   From: tj.iam.tj@proton.me   
      
   ip6gre tunnels fail to be decapsulated in v6.12.67 so never appears on    
   the GRE interface.   
      
   Reverting the following commit fixes it:   
      
   commit df5ffde9669314500809bc498ae73d6d3d9519ac   
   Author: Eric Dumazet    
   Date:   Wed Jan 7 16:31:09 2026 +0000   
      
        ip6_tunnel: use skb_vlan_inet_prepare() in __ip6_tnl_rcv()   
      
        [ Upstream commit 81c734dae203757fb3c9eee6f9896386940776bd ]   
      
   v6.19 works but I've not been able to identify a subsequent commit that    
   should also be backported to the stable tree.   
      
   --- SoupGate-Win32 v1.05   
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