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

   1 // SPDX-License-Identifier: GPL-2.0
   2 // Copyright (c) 2020 Isovalent, Inc.
   3 #include "vmlinux.h"
   4 #include <bpf/bpf_helpers.h>
   5
   6 struct {
   7         __uint(type, BPF_MAP_TYPE_SOCKMAP);
   8         __uint(max_entries, 2);
   9         __type(key, __u32);
  10         __type(value, __u64);
  11 } sock_map SEC(".maps");
  12
  13 struct {
  14         __uint(type, BPF_MAP_TYPE_SOCKHASH);
  15         __uint(max_entries, 2);
  16         __type(key, __u32);
  17         __type(value, __u64);
  18 } sock_hash SEC(".maps");
  19
  20 struct {
  21         __uint(type, BPF_MAP_TYPE_SK_STORAGE);
  22         __uint(map_flags, BPF_F_NO_PREALLOC);
  23         __type(key, __u32);
  24         __type(value, __u64);
  25 } socket_storage SEC(".maps");
  26
  27 SEC("sk_msg")
  28 int prog_msg_verdict(struct sk_msg_md *msg)
  29 {
  30         struct task_struct *task = (struct task_struct *)bpf_get_current_task();
  31         int verdict = SK_PASS;
  32         __u32 pid, tpid;
  33         __u64 *sk_stg;
  34
  35         pid = bpf_get_current_pid_tgid() >> 32;
  36         sk_stg = bpf_sk_storage_get(&socket_storage, msg->sk, 0, BPF_SK_STORAGE_GET_F_CREATE);
  37         if (!sk_stg)
  38                 return SK_DROP;
  39         *sk_stg = pid;
  40         bpf_probe_read_kernel(&tpid , sizeof(tpid), &task->tgid);
  41         if (pid != tpid)
  42                 verdict = SK_DROP;
  43         bpf_sk_storage_delete(&socket_storage, (void *)msg->sk);
  44         return verdict;
  45 }
  46
  47 char _license[] SEC("license") = "GPL";