LXR linux/tools/testing/selftests/bpf/progs/test_ns_current_pid

   1// SPDX-License-Identifier: GPL-2.0
   2/* Copyright (c) 2019 Carlos Neira cneirabustos@gmail.com */
   3
   4#include <linux/bpf.h>
   5#include <stdint.h>
   6#include <bpf/bpf_helpers.h>
   7
   8static volatile struct {
   9        __u64 dev;
  10        __u64 ino;
  11        __u64 pid_tgid;
  12        __u64 user_pid_tgid;
  13} res;
  14
  15SEC("raw_tracepoint/sys_enter")
  16int trace(void *ctx)
  17{
  18        __u64  ns_pid_tgid, expected_pid;
  19        struct bpf_pidns_info nsdata;
  20        __u32 key = 0;
  21
  22        if (bpf_get_ns_current_pid_tgid(res.dev, res.ino, &nsdata,
  23                   sizeof(struct bpf_pidns_info)))
  24                return 0;
  25
  26        ns_pid_tgid = (__u64)nsdata.tgid << 32 | nsdata.pid;
  27        expected_pid = res.user_pid_tgid;
  28
  29        if (expected_pid != ns_pid_tgid)
  30                return 0;
  31
  32        res.pid_tgid = ns_pid_tgid;
  33
  34        return 0;
  35}
  36
  37char _license[] SEC("license") = "GPL";
  38