selftests/bpf: Fix erroneous bitmask operation
[platform/kernel/linux-rpi.git] / tools / testing / selftests / bpf / progs / freplace_cls_redirect.c
1 // SPDX-License-Identifier: GPL-2.0
2 // Copyright (c) 2020 Facebook
3
4 #include <linux/stddef.h>
5 #include <linux/bpf.h>
6 #include <linux/pkt_cls.h>
7 #include <bpf/bpf_endian.h>
8 #include <bpf/bpf_helpers.h>
9
10 struct {
11         __uint(type, BPF_MAP_TYPE_SOCKMAP);
12         __type(key, int);
13         __type(value, int);
14         __uint(max_entries, 2);
15 } sock_map SEC(".maps");
16
17 SEC("freplace/cls_redirect")
18 int freplace_cls_redirect_test(struct __sk_buff *skb)
19 {
20         int ret = 0;
21         const int zero = 0;
22         struct bpf_sock *sk;
23
24         sk = bpf_map_lookup_elem(&sock_map, &zero);
25         if (!sk)
26                 return TC_ACT_SHOT;
27
28         ret = bpf_map_update_elem(&sock_map, &zero, sk, 0);
29         bpf_sk_release(sk);
30
31         return ret == 0 ? TC_ACT_OK : TC_ACT_SHOT;
32 }
33
34 char _license[] SEC("license") = "GPL";