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bpf: Add a new kfunc for cgroup1 hierarchy

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A new kfunc is added to acquire cgroup1 of a task:

- bpf_task_get_cgroup1
  Acquires the associated cgroup of a task whithin a specific cgroup1
  hierarchy. The cgroup1 hierarchy is identified by its hierarchy ID.

This new kfunc enables the tracing of tasks within a designated
container or cgroup directory in BPF programs.

Suggested-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Yafang Shao <laoar.shao@gmail.com>
Acked-by: Tejun Heo <tj@kernel.org>
Link: https://lore.kernel.org/r/20231111090034.4248-2-laoar.shao@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Yafang Shao 2023-11-11 09:00:29 +00:00 committed by Alexei Starovoitov
parent 727a92d62f
commit fe977716b4
1 changed files with 20 additions and 0 deletions
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20
kernel/bpf/helpers.c
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@ -2228,6 +2228,25 @@ __bpf_kfunc long bpf_task_under_cgroup(struct task_struct *task,
rcu_read_unlock();
return ret;
}
/**
* bpf_task_get_cgroup1 - Acquires the associated cgroup of a task within a
* specific cgroup1 hierarchy. The cgroup1 hierarchy is identified by its
* hierarchy ID.
* @task: The target task
* @hierarchy_id: The ID of a cgroup1 hierarchy
*
* On success, the cgroup is returen. On failure, NULL is returned.
*/
__bpf_kfunc struct cgroup *
bpf_task_get_cgroup1(struct task_struct *task, int hierarchy_id)
{
struct cgroup *cgrp = task_get_cgroup1(task, hierarchy_id);
if (IS_ERR(cgrp))
return NULL;
return cgrp;
}
#endif /* CONFIG_CGROUPS */
/**
@ -2534,6 +2553,7 @@ BTF_ID_FLAGS(func, bpf_cgroup_release, KF_RELEASE)
BTF_ID_FLAGS(func, bpf_cgroup_ancestor, KF_ACQUIRE | KF_RCU | KF_RET_NULL)
BTF_ID_FLAGS(func, bpf_cgroup_from_id, KF_ACQUIRE | KF_RET_NULL)
BTF_ID_FLAGS(func, bpf_task_under_cgroup, KF_RCU)
BTF_ID_FLAGS(func, bpf_task_get_cgroup1, KF_ACQUIRE | KF_RCU | KF_RET_NULL)
#endif
BTF_ID_FLAGS(func, bpf_task_from_pid, KF_ACQUIRE | KF_RET_NULL)
BTF_ID_FLAGS(func, bpf_throw)