diff options
| author | Toke Høiland-Jørgensen <toke@redhat.com> | 2019-06-28 11:12:35 +0200 |
|---|---|---|
| committer | Daniel Borkmann <daniel@iogearbox.net> | 2019-06-29 01:31:09 +0200 |
| commit | 0cdbb4b09a0658b72c563638d476113aadd91afb (patch) | |
| tree | 5e29d398bd0fcaac393d22b98ce3f0bc48f49f05 /kernel/bpf/cpumap.c | |
| parent | 43e74c0267a35d6f5127218054b2d80c7fe801f5 (diff) | |
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 <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>
Diffstat (limited to 'kernel/bpf/cpumap.c')
0 files changed, 0 insertions, 0 deletions