Urs Thuermann wrote:
> * Use skb->iif instead of skb->cb to pass receiving interface from
>   raw_rcv() and bcm_rcv() up to raw_recvmsg() and bcm_recvmsg().


skb->iif doesn't necessarily point to the incoming network device
as seen seen by netif_receive_skb, for layered devices it currently
always points to the first interface that received a packet.

Its so far also only used for traffic classification, please explain
how you're using it and what values it is set to on which paths.
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