Toke Høiland-Jørgensen 1deeab02ae
BACKPORT: devmap: Allow map lookups from eBPF ...
We don't currently allow lookups into a devmap from eBPF, because the map
lookup returns a pointer directly to the dev->ifindex, which shouldn't be
modifiable from eBPF.
However, being able to do lookups in devmaps is useful to know (e.g.)
whether forwarding to a specific interface is enabled. Currently, programs
work around this by keeping a shadow map of another type which indicates
whether a map index is valid.
Since we now have a flag to make maps read-only from the eBPF side, we can
simply lift the lookup restriction if we make sure this flag is always set.
Change-Id: I42b1430605c6837710fd903a0c8abf2c7dc13f16
Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com >
Acked-by: Jonathan Lemon <jonathan.lemon@gmail.com >
Acked-by: Andrii Nakryiko <andriin@fb.com >
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net >
Signed-off-by: Cyber Knight <cyberknight755@gmail.com >
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1deeab02ae