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.
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