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tools: bpftool: Make libcap dependency optional

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The new libcap dependency is not used for an essential feature of
bpftool, and we could imagine building the tool without checks on
CAP_SYS_ADMIN by disabling probing features as an unprivileged users.

Make it so, in order to avoid a hard dependency on libcap, and to ease
packaging/embedding of bpftool.

Signed-off-by: Quentin Monnet <quentin@isovalent.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Link: https://lore.kernel.org/bpf/20200429144506.8999-4-quentin@isovalent.com
This commit is contained in:
Quentin Monnet
2020-04-29 15:45:06 +01:00
committed by Daniel Borkmann
parent cf9bf71452
commit 0b3b9ca3d1
3 changed files with 38 additions and 5 deletions
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4
tools/bpf/bpftool/Documentation/bpftool-feature.rst
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@@ -55,7 +55,9 @@ DESCRIPTION
that case usually represent a small subset of the parameters
supported by the system. Unprivileged users MUST use the
**unprivileged** keyword: This is to avoid misdetection if
bpftool is inadvertently run as non-root, for example.
bpftool is inadvertently run as non-root, for example. This
keyword is unavailable if bpftool was compiled without
libcap.
**bpftool feature probe dev** *NAME* [**full**] [**macros** [**prefix** *PREFIX*]]
Probe network device for supported eBPF features and dump