Alexei Starovoitov 37e82c2f97
bpf: allow BPF programs access skb->skb_iif and skb->dev->ifindex fields ...
classic BPF already exposes skb->dev->ifindex via SKF_AD_IFINDEX extension.
Allow eBPF program to access it as well. Note that classic aborts execution
of the program if 'skb->dev == NULL' (which is inconvenient for program
writers), whereas eBPF returns zero in such case.
Also expose the 'skb_iif' field, since programs triggered by redirected
packet need to known the original interface index.
Summary:
__skb->ifindex -> skb->dev->ifindex
__skb->ingress_ifindex -> skb->skb_iif
Signed-off-by: Alexei Starovoitov <ast@plumgrid.com >
Acked-by: Daniel Borkmann <daniel@iogearbox.net >
Signed-off-by: David S. Miller <davem@davemloft.net >
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37e82c2f97