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bpftool: Implement link show support for netkit

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Add support to dump netkit link information to bpftool in similar way as
we have for XDP. The netkit link info only exposes the ifindex and the
attach_type.

Below shows an example link dump output, and a cgroup link is included for
comparison, too:

  # bpftool link
  [...]
  10: cgroup  prog 2466
        cgroup_id 1  attach_type cgroup_inet6_post_bind
  [...]
  8: netkit  prog 35
        ifindex nk1(18)  attach_type netkit_primary
  [...]

Equivalent json output:

  # bpftool link --json
  [...]
  {
    "id": 10,
    "type": "cgroup",
    "prog_id": 2466,
    "cgroup_id": 1,
    "attach_type": "cgroup_inet6_post_bind"
  },
  [...]
  {
    "id": 12,
    "type": "netkit",
    "prog_id": 61,
    "devname": "nk1",
    "ifindex": 21,
    "attach_type": "netkit_primary"
  }
  [...]

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Reviewed-by: Quentin Monnet <quentin@isovalent.com>
Acked-by: Martin KaFai Lau <martin.lau@kernel.org>
Link: https://lore.kernel.org/r/20231024214904.29825-5-daniel@iogearbox.net
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
This commit is contained in:
Daniel Borkmann 2023-10-24 23:49:01 +02:00 committed by Martin KaFai Lau
parent 05c31b4ab2
commit 92a85e18ad
1 changed files with 9 additions and 0 deletions
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9
tools/bpf/bpftool/link.c
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@ -451,6 +451,10 @@ static int show_link_close_json(int fd, struct bpf_link_info *info)
show_link_ifindex_json(info->tcx.ifindex, json_wtr);
show_link_attach_type_json(info->tcx.attach_type, json_wtr);
break;
case BPF_LINK_TYPE_NETKIT:
show_link_ifindex_json(info->netkit.ifindex, json_wtr);
show_link_attach_type_json(info->netkit.attach_type, json_wtr);
break;
case BPF_LINK_TYPE_XDP:
show_link_ifindex_json(info->xdp.ifindex, json_wtr);
break;
@ -791,6 +795,11 @@ static int show_link_close_plain(int fd, struct bpf_link_info *info)
show_link_ifindex_plain(info->tcx.ifindex);
show_link_attach_type_plain(info->tcx.attach_type);
break;
case BPF_LINK_TYPE_NETKIT:
printf("\n\t");
show_link_ifindex_plain(info->netkit.ifindex);
show_link_attach_type_plain(info->netkit.attach_type);
break;
case BPF_LINK_TYPE_XDP:
printf("\n\t");
show_link_ifindex_plain(info->xdp.ifindex);