From 60d20f9195b260bdf0ac10c275ae9f6016f9c069 Mon Sep 17 00:00:00 2001 From: Sargun Dhillon Date: Fri, 12 Aug 2016 08:56:52 -0700 Subject: bpf: Add bpf_current_task_under_cgroup helper This adds a bpf helper that's similar to the skb_in_cgroup helper to check whether the probe is currently executing in the context of a specific subset of the cgroupsv2 hierarchy. It does this based on membership test for a cgroup arraymap. It is invalid to call this in an interrupt, and it'll return an error. The helper is primarily to be used in debugging activities for containers, where you may have multiple programs running in a given top-level "container". Signed-off-by: Sargun Dhillon Cc: Alexei Starovoitov Cc: Daniel Borkmann Cc: Tejun Heo Acked-by: Tejun Heo Acked-by: Alexei Starovoitov Acked-by: Daniel Borkmann Signed-off-by: David S. Miller --- include/uapi/linux/bpf.h | 11 +++++++++++ 1 file changed, 11 insertions(+) (limited to 'include/uapi/linux/bpf.h') diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h index da218fec6056..bea0c4e2830a 100644 --- a/include/uapi/linux/bpf.h +++ b/include/uapi/linux/bpf.h @@ -375,6 +375,17 @@ enum bpf_func_id { */ BPF_FUNC_probe_write_user, + /** + * bpf_current_task_under_cgroup(map, index) - Check cgroup2 membership of current task + * @map: pointer to bpf_map in BPF_MAP_TYPE_CGROUP_ARRAY type + * @index: index of the cgroup in the bpf_map + * Return: + * == 0 current failed the cgroup2 descendant test + * == 1 current succeeded the cgroup2 descendant test + * < 0 error + */ + BPF_FUNC_current_task_under_cgroup, + __BPF_FUNC_MAX_ID, }; -- cgit v1.2.3