Daniel Borkmann 8d20aabe1c
ebpf: add helper to retrieve net_cls's classid cookie ...
It would be very useful to retrieve the net_cls's classid from an eBPF
program to allow for a more fine-grained classification, it could be
directly used or in conjunction with additional policies. I.e. docker,
but also tooling such as cgexec, can easily run applications via net_cls
cgroups:
cgcreate -g net_cls:/foo
echo 42 > foo/net_cls.classid
cgexec -g net_cls:foo <prog>
Thus, their respecitve classid cookie of foo can then be looked up on
the egress path to apply further policies. The helper is desigend such
that a non-zero value returns the cgroup id.
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net >
Cc: Thomas Graf <tgraf@suug.ch >
Acked-by: Alexei Starovoitov <ast@plumgrid.com >
Signed-off-by: David S. Miller <davem@davemloft.net >
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8d20aabe1c