1// SPDX-License-Identifier: GPL-2.0
2/* Copyright (c) 2020 Google LLC. */
3#include "bpf_iter.h"
4#include <bpf/bpf_helpers.h>
5#include <bpf/bpf_tracing.h>
6
7char _license[] SEC("license") = "GPL";
8
9struct {
10	__uint(type, BPF_MAP_TYPE_SK_STORAGE);
11	__uint(map_flags, BPF_F_NO_PREALLOC);
12	__type(key, int);
13	__type(value, int);
14} sk_stg_map SEC(".maps");
15
16SEC("iter/bpf_sk_storage_map")
17int delete_bpf_sk_storage_map(struct bpf_iter__bpf_sk_storage_map *ctx)
18{
19	if (ctx->sk)
20		bpf_sk_storage_delete(&sk_stg_map, ctx->sk);
21
22	return 0;
23}
24
25SEC("iter/task_file")
26int fill_socket_owner(struct bpf_iter__task_file *ctx)
27{
28	struct task_struct *task = ctx->task;
29	struct file *file = ctx->file;
30	struct socket *sock;
31	int *sock_tgid;
32
33	if (!task || !file)
34		return 0;
35
36	sock = bpf_sock_from_file(file);
37	if (!sock)
38		return 0;
39
40	sock_tgid = bpf_sk_storage_get(&sk_stg_map, sock->sk, 0, 0);
41	if (!sock_tgid)
42		return 0;
43
44	*sock_tgid = task->tgid;
45
46	return 0;
47}
48
49SEC("iter/tcp")
50int negate_socket_local_storage(struct bpf_iter__tcp *ctx)
51{
52	struct sock_common *sk_common = ctx->sk_common;
53	int *sock_tgid;
54
55	if (!sk_common)
56		return 0;
57
58	sock_tgid = bpf_sk_storage_get(&sk_stg_map, sk_common, 0, 0);
59	if (!sock_tgid)
60		return 0;
61
62	*sock_tgid = -*sock_tgid;
63
64	return 0;
65}
66