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

source code of linux/tools/testing/selftests/bpf/progs/bpf_iter_bpf_sk_storage_helpers.c