tools/testing/selftests/bpf/progs/test_obj_id.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /* Copyright (c) 2017 Facebook
   3  */
   4 #include <stddef.h>
   5 #include <linux/bpf.h>
   6 #include <linux/pkt_cls.h>
   7 #include "bpf_helpers.h"
   8
   9 /* It is a dumb bpf program such that it must have no
  10  * issue to be loaded since testing the verifier is
  11  * not the focus here.
  12  */
  13
  14 int _version SEC("version") = 1;
  15
  16 struct {
  17         __uint(type, BPF_MAP_TYPE_ARRAY);
  18         __uint(max_entries, 1);
  19         __type(key, __u32);
  20         __type(value, __u64);
  21 } test_map_id SEC(".maps");
  22
  23 SEC("test_obj_id_dummy")
  24 int test_obj_id(struct __sk_buff *skb)
  25 {
  26         __u32 key = 0;
  27         __u64 *value;
  28
  29         value = bpf_map_lookup_elem(&test_map_id, &key);
  30
  31         return TC_ACT_OK;
  32 }