tools/testing/selftests/bpf/test_obj_id.c

   1 /* Copyright (c) 2017 Facebook
   2  *
   3  * This program is free software; you can redistribute it and/or
   4  * modify it under the terms of version 2 of the GNU General Public
   5  * License as published by the Free Software Foundation.
   6  */
   7 #include <stddef.h>
   8 #include <linux/bpf.h>
   9 #include <linux/pkt_cls.h>
  10 #include "bpf_helpers.h"
  11
  12 /* It is a dumb bpf program such that it must have no
  13  * issue to be loaded since testing the verifier is
  14  * not the focus here.
  15  */
  16
  17 int _version SEC("version") = 1;
  18
  19 struct bpf_map_def SEC("maps") test_map_id = {
  20         .type = BPF_MAP_TYPE_ARRAY,
  21         .key_size = sizeof(__u32),
  22         .value_size = sizeof(__u64),
  23         .max_entries = 1,
  24 };
  25
  26 SEC("test_obj_id_dummy")
  27 int test_obj_id(struct __sk_buff *skb)
  28 {
  29         __u32 key = 0;
  30         __u64 *value;
  31
  32         value = bpf_map_lookup_elem(&test_map_id, &key);
  33
  34         return TC_ACT_OK;
  35 }