1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* Copyright (c) 2020 Facebook */ |
3 | |
4 | #include <vmlinux.h> |
5 | #include <bpf/bpf_tracing.h> |
6 | #include <bpf/bpf_helpers.h> |
7 | |
8 | struct { |
9 | __uint(type, BPF_MAP_TYPE_SK_STORAGE); |
10 | __uint(map_flags, BPF_F_NO_PREALLOC); |
11 | __type(key, int); |
12 | __type(value, int); |
13 | } sk_stg_map SEC(".maps" ); |
14 | |
15 | SEC("fentry/bpf_sk_storage_free" ) |
16 | int BPF_PROG(trace_bpf_sk_storage_free, struct sock *sk) |
17 | { |
18 | int *value; |
19 | |
20 | value = bpf_sk_storage_get(&sk_stg_map, sk, 0, |
21 | BPF_SK_STORAGE_GET_F_CREATE); |
22 | |
23 | if (value) |
24 | *value = 1; |
25 | |
26 | return 0; |
27 | } |
28 | |
29 | char _license[] SEC("license" ) = "GPL" ; |
30 | |