30 lines
633 B
C
30 lines
633 B
C
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// SPDX-License-Identifier: GPL-2.0
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/* Copyright (C) 2022. Huawei Technologies Co., Ltd */
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#include <linux/bpf.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_HASH);
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__uint(max_entries, 1);
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__uint(key_size, sizeof(__u32));
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__uint(value_size, sizeof(__u32));
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} htab SEC(".maps");
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int pid = 0;
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int update_err = 0;
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SEC("?fentry/lookup_elem_raw")
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int lookup_elem_raw(void *ctx)
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{
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__u32 key = 0, value = 1;
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if ((bpf_get_current_pid_tgid() >> 32) != pid)
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return 0;
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update_err = bpf_map_update_elem(&htab, &key, &value, 0);
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return 0;
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}
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