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8d20aabe1c
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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