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 
8 struct {
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 
get_pid_tgid(void)20 static 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 
31 SEC("?tracepoint/syscalls/sys_enter_nanosleep")
tp_handler(const void * ctx)32 int tp_handler(const void *ctx)
33 {
34 	get_pid_tgid();
35 	return 0;
36 }
37 
38 SEC("?cgroup/bind4")
cgroup_bind4(struct bpf_sock_addr * ctx)39 int cgroup_bind4(struct bpf_sock_addr *ctx)
40 {
41 	get_pid_tgid();
42 	return 1;
43 }
44 
45 SEC("?sk_msg")
sk_msg(struct sk_msg_md * msg)46 int sk_msg(struct sk_msg_md *msg)
47 {
48 	get_pid_tgid();
49 	return SK_PASS;
50 }
51 
52 char _license[] SEC("license") = "GPL";
53