cgroup: bpf: Add bpf_skb_in_cgroup_proto

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Adds a bpf helper, bpf_skb_in_cgroup, to decide if a skb->sk
belongs to a descendant of a cgroup2.  It is similar to the
feature added in netfilter:
commit c38c4597e4 ("netfilter: implement xt_cgroup cgroup2 path match")

The user is expected to populate a BPF_MAP_TYPE_CGROUP_ARRAY
which will be used by the bpf_skb_in_cgroup.

Modifications to the bpf verifier is to ensure BPF_MAP_TYPE_CGROUP_ARRAY
and bpf_skb_in_cgroup() are always used together.

Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Cc: Alexei Starovoitov <ast@fb.com>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: Tejun Heo <tj@kernel.org>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

...

This commit is contained in:

Martin KaFai Lau 2016-06-30 10:28:44 -07:00 • committed by David S. Miller

parent 4ed8ec521e

commit 4a482f34af

3 changed files with 56 additions and 1 deletions

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11

include/uapi/linux/bpf.h

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8

kernel/bpf/verifier.c

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38

net/core/filter.c

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