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
 8struct {
 9	__uint(type, BPF_MAP_TYPE_SOCKMAP);
10	__uint(max_entries, 2);
11	__type(key, __u32);
12	__type(value, __u32);
13} sock_map SEC(".maps");
14
15__u64 user_pid = 0;
16__u64 user_tgid = 0;
17__u64 dev = 0;
18__u64 ino = 0;
19
20static void get_pid_tgid(void)
21{
22	struct bpf_pidns_info nsdata;
23
24	if (bpf_get_ns_current_pid_tgid(dev, ino, &nsdata, sizeof(struct bpf_pidns_info)))
25		return;
26
27	user_pid = nsdata.pid;
28	user_tgid = nsdata.tgid;
29}
30
31SEC("?tracepoint/syscalls/sys_enter_nanosleep")
32int tp_handler(const void *ctx)
33{
34	get_pid_tgid();
35	return 0;
36}
37
38SEC("?cgroup/bind4")
39int cgroup_bind4(struct bpf_sock_addr *ctx)
40{
41	get_pid_tgid();
42	return 1;
43}
44
45SEC("?sk_msg")
46int sk_msg(struct sk_msg_md *msg)
47{
48	get_pid_tgid();
49	return SK_PASS;
50}
51
52char _license[] SEC("license") = "GPL";