95 lines
2.0 KiB
C
95 lines
2.0 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Copyright (c) 2022 Meta Platforms, Inc. and affiliates. */
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#include "vmlinux.h"
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#include <bpf/bpf_helpers.h>
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#include <bpf/bpf_tracing.h>
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char _license[] SEC("license") = "GPL";
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struct {
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__uint(type, BPF_MAP_TYPE_CGRP_STORAGE);
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__uint(map_flags, BPF_F_NO_PREALLOC);
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__type(key, int);
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__type(value, long);
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} map_a SEC(".maps");
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struct {
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__uint(type, BPF_MAP_TYPE_CGRP_STORAGE);
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__uint(map_flags, BPF_F_NO_PREALLOC);
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__type(key, int);
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__type(value, long);
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} map_b SEC(".maps");
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int target_hid = 0;
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bool is_cgroup1 = 0;
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struct cgroup *bpf_task_get_cgroup1(struct task_struct *task, int hierarchy_id) __ksym;
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void bpf_cgroup_release(struct cgroup *cgrp) __ksym;
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static void __on_update(struct cgroup *cgrp)
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{
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long *ptr;
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ptr = bpf_cgrp_storage_get(&map_a, cgrp, 0, BPF_LOCAL_STORAGE_GET_F_CREATE);
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if (ptr)
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*ptr += 1;
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ptr = bpf_cgrp_storage_get(&map_b, cgrp, 0, BPF_LOCAL_STORAGE_GET_F_CREATE);
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if (ptr)
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*ptr += 1;
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}
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SEC("fentry/bpf_local_storage_update")
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int BPF_PROG(on_update)
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{
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struct task_struct *task = bpf_get_current_task_btf();
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struct cgroup *cgrp;
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if (is_cgroup1) {
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cgrp = bpf_task_get_cgroup1(task, target_hid);
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if (!cgrp)
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return 0;
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__on_update(cgrp);
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bpf_cgroup_release(cgrp);
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return 0;
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}
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__on_update(task->cgroups->dfl_cgrp);
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return 0;
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}
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static void __on_enter(struct pt_regs *regs, long id, struct cgroup *cgrp)
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{
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long *ptr;
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ptr = bpf_cgrp_storage_get(&map_a, cgrp, 0, BPF_LOCAL_STORAGE_GET_F_CREATE);
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if (ptr)
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*ptr = 200;
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ptr = bpf_cgrp_storage_get(&map_b, cgrp, 0, BPF_LOCAL_STORAGE_GET_F_CREATE);
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if (ptr)
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*ptr = 100;
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}
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SEC("tp_btf/sys_enter")
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int BPF_PROG(on_enter, struct pt_regs *regs, long id)
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{
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struct task_struct *task = bpf_get_current_task_btf();
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struct cgroup *cgrp;
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if (is_cgroup1) {
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cgrp = bpf_task_get_cgroup1(task, target_hid);
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if (!cgrp)
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return 0;
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__on_enter(regs, id, cgrp);
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bpf_cgroup_release(cgrp);
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return 0;
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}
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__on_enter(regs, id, task->cgroups->dfl_cgrp);
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return 0;
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}
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