> For now I workarounded it with filling skb->cb with zeroes before
> netif_rx(),
This is right. For another examples look into tunnels.
> but I believe it is a kludge and networking layer should be fixed instead.
No.
alloc_skb() creates skb with clean cb. ip_rcv() and other protocol handlers
do not redo this work. If device uses cb internally, it must clear it
before handing skb to netif_rx().
Alexey
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