| 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"; |
| 35 |