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bpf: Support consuming XDP HW metadata from fext programs

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Instead of rejecting the attaching of PROG_TYPE_EXT programs to XDP
programs that consume HW metadata, implement support for propagating the
offload information. The extension program doesn't need to set a flag or
ifindex, these will just be propagated from the target by the verifier.
We need to create a separate offload object for the extension program,
though, since it can be reattached to a different program later (which
means we can't just inherit the offload information from the target).

An additional check is added on attach that the new target is compatible
with the offload information in the extension prog.

Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com>
Signed-off-by: Stanislav Fomichev <sdf@google.com>
Link: https://lore.kernel.org/r/20230119221536.3349901-9-sdf@google.com
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
This commit is contained in:
Toke Høiland-Jørgensen 2023-01-19 14:15:27 -08:00 • committed by Martin KaFai Lau
parent 3d76a4d3d4
commit fd7c211d68
4 changed files with 110 additions and 36 deletions
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7
kernel/bpf/syscall.c
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@ -2605,6 +2605,13 @@ static int bpf_prog_load(union bpf_attr *attr, bpfptr_t uattr)
goto free_prog_sec;
}
if (type == BPF_PROG_TYPE_EXT && dst_prog &&
bpf_prog_is_dev_bound(dst_prog->aux)) {
err = bpf_prog_dev_bound_inherit(prog, dst_prog);
if (err)
goto free_prog_sec;
}
/* find program type: socket_filter vs tracing_filter */
err = find_prog_type(type, prog);
if (err < 0)