// SPDX-License-Identifier: GPL-2.0
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/* Copyright (c) 2019 Carlos Neira cneirabustos@gmail.com */
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#include <linux/bpf.h>
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#include <stdint.h>
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#include <bpf/bpf_helpers.h>
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static volatile struct {
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__u64 dev;
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__u64 ino;
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__u64 pid_tgid;
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__u64 user_pid_tgid;
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} res;
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SEC("raw_tracepoint/sys_enter")
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int trace(void *ctx)
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{
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__u64 ns_pid_tgid, expected_pid;
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struct bpf_pidns_info nsdata;
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__u32 key = 0;
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if (bpf_get_ns_current_pid_tgid(res.dev, res.ino, &nsdata,
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sizeof(struct bpf_pidns_info)))
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return 0;
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ns_pid_tgid = (__u64)nsdata.tgid << 32 | nsdata.pid;
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expected_pid = res.user_pid_tgid;
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if (expected_pid != ns_pid_tgid)
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return 0;
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res.pid_tgid = ns_pid_tgid;
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return 0;
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}
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char _license[] SEC("license") = "GPL";
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