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libbpf: Add link-based API for netkit

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This adds bpf_program__attach_netkit() API to libbpf. Overall it is very
similar to tcx. The API looks as following:

  LIBBPF_API struct bpf_link *
  bpf_program__attach_netkit(const struct bpf_program *prog, int ifindex,
                             const struct bpf_netkit_opts *opts);

The struct bpf_netkit_opts is done in similar way as struct bpf_tcx_opts
for supporting bpf_mprog control parameters. The attach location for the
primary and peer device is derived from the program section "netkit/primary"
and "netkit/peer", respectively.

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Martin KaFai Lau <martin.lau@kernel.org>
Link: https://lore.kernel.org/r/20231024214904.29825-4-daniel@iogearbox.net
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
This commit is contained in:
Daniel Borkmann
2023-10-24 23:49:00 +02:00
committed by Andrii Nakryiko
parent cc7f085286
commit 2cb0236318
5 changed files with 76 additions and 0 deletions
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16
src/bpf.c
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@@ -810,6 +810,22 @@ int bpf_link_create(int prog_fd, int target_fd,
if (!OPTS_ZEROED(opts, tcx))
return libbpf_err(-EINVAL);
break;
case BPF_NETKIT_PRIMARY:
case BPF_NETKIT_PEER:
relative_fd = OPTS_GET(opts, netkit.relative_fd, 0);
relative_id = OPTS_GET(opts, netkit.relative_id, 0);
if (relative_fd && relative_id)
return libbpf_err(-EINVAL);
if (relative_id) {
attr.link_create.netkit.relative_id = relative_id;
attr.link_create.flags |= BPF_F_ID;
} else {
attr.link_create.netkit.relative_fd = relative_fd;
}
attr.link_create.netkit.expected_revision = OPTS_GET(opts, netkit.expected_revision, 0);
if (!OPTS_ZEROED(opts, netkit))
return libbpf_err(-EINVAL);
break;
default:
if (!OPTS_ZEROED(opts, flags))
return libbpf_err(-EINVAL);