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