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| author | Toke Høiland-Jørgensen <[email protected]> | 2019-06-28 09:12:35 +0000 |
|---|---|---|
| committer | Daniel Borkmann <[email protected]> | 2019-06-28 23:31:09 +0000 |
| commit | 0cdbb4b09a0658b72c563638d476113aadd91afb (patch) | |
| tree | 5e29d398bd0fcaac393d22b98ce3f0bc48f49f05 /tools/lib/bpf/str_error.c | |
| parent | bpf_xdp_redirect_map: Perform map lookup in eBPF helper (diff) | |
| download | kernel-0cdbb4b09a0658b72c563638d476113aadd91afb.tar.gz kernel-0cdbb4b09a0658b72c563638d476113aadd91afb.zip | |
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.
Signed-off-by: Toke Høiland-Jørgensen <[email protected]>
Acked-by: Jonathan Lemon <[email protected]>
Acked-by: Andrii Nakryiko <[email protected]>
Signed-off-by: Daniel Borkmann <[email protected]>
Diffstat (limited to 'tools/lib/bpf/str_error.c')
0 files changed, 0 insertions, 0 deletions