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bpf: allow BPF programs access skb->skb_iif and skb->dev->ifindex fields

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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>
This commit is contained in:
Alexei Starovoitov 2015-05-27 15:30:39 -07:00 • committed by David S. Miller
commit 37e82c2f97
2 changed files with 20 additions and 0 deletions
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2
include/uapi/linux/bpf.h
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@ -236,6 +236,8 @@ struct __sk_buff {
__u32 vlan_tci;
__u32 vlan_proto;
__u32 priority;
__u32 ingress_ifindex;
__u32 ifindex;
};
#endif /* _UAPI__LINUX_BPF_H__ */