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From: Martin KaFai Lau <kafai@fb.com>
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CC: Alexei Starovoitov <ast@fb.com>, Daniel Borkmann <daniel@iogearbox.net>,
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Subject: [PATCH net-next v2 0/4] cgroup: bpf: cgroup2 membership test on skb
Date: Wed, 22 Jun 2016 14:17:28 -0700
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v2:
- Fix two return cases in cgroup_get_from_fd()
- Fix compilation errors when CONFIG_CGROUPS is not used:
  - arraymap.c: avoid registering BPF_MAP_TYPE_CGROUP_ARRAY
  - filter.c: tc_cls_act_func_proto() returns NULL on BPF_FUNC_skb_in_cgroup
- Add comments to BPF_FUNC_skb_in_cgroup and cgroup_get_from_fd()

v1 cover letter:
This series is to implement a bpf-way to
check the cgroup2 membership of a skb (sk_buff).

It is similar to the feature added in netfilter:
c38c4597e4bf ("netfilter: implement xt_cgroup cgroup2 path match")

The current target is the tc-like usage.