Hao Luo | fe0dd9d | 2022-08-24 16:31:14 -0700 | [diff] [blame] | 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 | } |