35 lines
722 B
C
35 lines
722 B
C
// SPDX-License-Identifier: GPL-2.0
|
|
// Copyright (c) 2020 Facebook
|
|
|
|
#include <linux/stddef.h>
|
|
#include <linux/bpf.h>
|
|
#include <linux/pkt_cls.h>
|
|
#include <bpf/bpf_endian.h>
|
|
#include <bpf/bpf_helpers.h>
|
|
|
|
struct {
|
|
__uint(type, BPF_MAP_TYPE_SOCKMAP);
|
|
__type(key, int);
|
|
__type(value, int);
|
|
__uint(max_entries, 2);
|
|
} sock_map SEC(".maps");
|
|
|
|
SEC("freplace/cls_redirect")
|
|
int freplace_cls_redirect_test(struct __sk_buff *skb)
|
|
{
|
|
int ret = 0;
|
|
const int zero = 0;
|
|
struct bpf_sock *sk;
|
|
|
|
sk = bpf_map_lookup_elem(&sock_map, &zero);
|
|
if (!sk)
|
|
return TC_ACT_SHOT;
|
|
|
|
ret = bpf_map_update_elem(&sock_map, &zero, sk, 0);
|
|
bpf_sk_release(sk);
|
|
|
|
return ret == 0 ? TC_ACT_OK : TC_ACT_SHOT;
|
|
}
|
|
|
|
char _license[] SEC("license") = "GPL";
|