1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright (c) 2022 Google */
3
4 #include "bpf_iter.h"
5 #include <bpf/bpf_helpers.h>
6 #include <bpf/bpf_tracing.h>
7
8 char _license[] SEC("license") = "GPL";
9 int terminate_early = 0;
10 u64 terminal_cgroup = 0;
11
12 static inline u64 cgroup_id(struct cgroup *cgrp)
13 {
14 return cgrp->kn->id;
15 }
16
17 SEC("iter/cgroup")
18 int cgroup_id_printer(struct bpf_iter__cgroup *ctx)
19 {
20 struct seq_file *seq = ctx->meta->seq;
21 struct cgroup *cgrp = ctx->cgroup;
22
23 /* epilogue */
24 if (cgrp == NULL) {
25 BPF_SEQ_PRINTF(seq, "epilogue\n");
26 return 0;
27 }
28
29 /* prologue */
30 if (ctx->meta->seq_num == 0)
31 BPF_SEQ_PRINTF(seq, "prologue\n");
32
33 BPF_SEQ_PRINTF(seq, "%8llu\n", cgroup_id(cgrp));
34
35 if (terminal_cgroup == cgroup_id(cgrp))
36 return 1;
37
38 return terminate_early ? 1 : 0;
39 }
40
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