On Sun, May 31, 2020 at 1:31 AM Jakub Sitnicki <jakub@xxxxxxxxxxxxxx> wrote:
>
> Make `bpf link show` aware of new link type, that is links attached to
> netns. When listing netns-attached links, display netns inode number as its
> identifier and link attach type.
>
> Sample session:
>
> # readlink /proc/self/ns/net
> net:[4026532251]
> # bpftool prog show
> 357: flow_dissector tag a04f5eef06a7f555 gpl
> loaded_at 2020-05-30T16:53:51+0200 uid 0
> xlated 16B jited 37B memlock 4096B
> 358: flow_dissector tag a04f5eef06a7f555 gpl
> loaded_at 2020-05-30T16:53:51+0200 uid 0
> xlated 16B jited 37B memlock 4096B
> # bpftool link show
> 108: netns prog 357
> netns_ino 4026532251 attach_type flow_dissector
> # bpftool link -jp show
> [{
> "id": 108,
> "type": "netns",
> "prog_id": 357,
> "netns_ino": 4026532251,
> "attach_type": "flow_dissector"
> }
> ]
>
> (... after netns is gone ...)
>
> # bpftool link show
> 108: netns prog 357
> netns_ino 0 attach_type flow_dissector
> # bpftool link -jp show
> [{
> "id": 108,
> "type": "netns",
> "prog_id": 357,
> "netns_ino": 0,
> "attach_type": "flow_dissector"
> }
> ]
>
> Signed-off-by: Jakub Sitnicki <jakub@xxxxxxxxxxxxxx>
> ---
LGTM. Not sure if bpftool allows to filter progs/maps by type, but
probably we should eventually add link type filtering ("show me only
netns links")...
Acked-by: Andrii Nakryiko <andriin@xxxxxx>
> tools/bpf/bpftool/link.c | 10 ++++++++++
> 1 file changed, 10 insertions(+)
>
[...]
