tools/testing/selftests/bpf/test_pkt_md_access.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 <string.h>
   9 #include <linux/bpf.h>
  10 #include <linux/pkt_cls.h>
  11 #include "bpf_helpers.h"
  12
  13 int _version SEC("version") = 1;
  14
  15 #define TEST_FIELD(TYPE, FIELD, MASK)                                   \
  16         {                                                               \
  17                 TYPE tmp = *(volatile TYPE *)&skb->FIELD;               \
  18                 if (tmp != ((*(volatile __u32 *)&skb->FIELD) & MASK))   \
  19                         return TC_ACT_SHOT;                             \
  20         }
  21
  22 SEC("test1")
  23 int process(struct __sk_buff *skb)
  24 {
  25         TEST_FIELD(__u8,  len, 0xFF);
  26         TEST_FIELD(__u16, len, 0xFFFF);
  27         TEST_FIELD(__u32, len, 0xFFFFFFFF);
  28         TEST_FIELD(__u16, protocol, 0xFFFF);
  29         TEST_FIELD(__u32, protocol, 0xFFFFFFFF);
  30         TEST_FIELD(__u8,  hash, 0xFF);
  31         TEST_FIELD(__u16, hash, 0xFFFF);
  32         TEST_FIELD(__u32, hash, 0xFFFFFFFF);
  33
  34         return TC_ACT_OK;
  35 }