LXR linux/tools/testing/selftests/bpf/progs/freplace_cls

   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
  10struct bpf_map_def SEC("maps") sock_map = {
  11        .type = BPF_MAP_TYPE_SOCKMAP,
  12        .key_size = sizeof(int),
  13        .value_size = sizeof(int),
  14        .max_entries = 2,
  15};
  16
  17SEC("freplace/cls_redirect")
  18int 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
  34char _license[] SEC("license") = "GPL";
  35