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-rw-r--r--tools/testing/selftests/bpf/progs/iters_css.c72
1 files changed, 72 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/progs/iters_css.c b/tools/testing/selftests/bpf/progs/iters_css.c
new file mode 100644
index 000000000000..ec1f6c2f590b
--- /dev/null
+++ b/tools/testing/selftests/bpf/progs/iters_css.c
@@ -0,0 +1,72 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (C) 2023 Chuyi Zhou <zhouchuyi@bytedance.com> */
+
+#include "vmlinux.h"
+#include <bpf/bpf_helpers.h>
+#include <bpf/bpf_tracing.h>
+#include "bpf_misc.h"
+#include "bpf_experimental.h"
+
+char _license[] SEC("license") = "GPL";
+
+pid_t target_pid;
+u64 root_cg_id, leaf_cg_id;
+u64 first_cg_id, last_cg_id;
+
+int pre_order_cnt, post_order_cnt, tree_high;
+
+struct cgroup *bpf_cgroup_from_id(u64 cgid) __ksym;
+void bpf_cgroup_release(struct cgroup *p) __ksym;
+void bpf_rcu_read_lock(void) __ksym;
+void bpf_rcu_read_unlock(void) __ksym;
+
+SEC("fentry.s/" SYS_PREFIX "sys_getpgid")
+int iter_css_for_each(const void *ctx)
+{
+ struct task_struct *cur_task = bpf_get_current_task_btf();
+ struct cgroup_subsys_state *root_css, *leaf_css, *pos;
+ struct cgroup *root_cgrp, *leaf_cgrp, *cur_cgrp;
+
+ if (cur_task->pid != target_pid)
+ return 0;
+
+ root_cgrp = bpf_cgroup_from_id(root_cg_id);
+
+ if (!root_cgrp)
+ return 0;
+
+ leaf_cgrp = bpf_cgroup_from_id(leaf_cg_id);
+
+ if (!leaf_cgrp) {
+ bpf_cgroup_release(root_cgrp);
+ return 0;
+ }
+ root_css = &root_cgrp->self;
+ leaf_css = &leaf_cgrp->self;
+ pre_order_cnt = post_order_cnt = tree_high = 0;
+ first_cg_id = last_cg_id = 0;
+
+ bpf_rcu_read_lock();
+ bpf_for_each(css, pos, root_css, BPF_CGROUP_ITER_DESCENDANTS_POST) {
+ cur_cgrp = pos->cgroup;
+ post_order_cnt++;
+ last_cg_id = cur_cgrp->kn->id;
+ }
+
+ bpf_for_each(css, pos, root_css, BPF_CGROUP_ITER_DESCENDANTS_PRE) {
+ cur_cgrp = pos->cgroup;
+ pre_order_cnt++;
+ if (!first_cg_id)
+ first_cg_id = cur_cgrp->kn->id;
+ }
+
+ bpf_for_each(css, pos, leaf_css, BPF_CGROUP_ITER_ANCESTORS_UP)
+ tree_high++;
+
+ bpf_for_each(css, pos, root_css, BPF_CGROUP_ITER_ANCESTORS_UP)
+ tree_high--;
+ bpf_rcu_read_unlock();
+ bpf_cgroup_release(root_cgrp);
+ bpf_cgroup_release(leaf_cgrp);
+ return 0;
+}