Release 4.18 tools/testing/selftests/bpf/test_pkt_md_access.c

/* Copyright (c) 2017 Facebook
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of version 2 of the GNU General Public
 * License as published by the Free Software Foundation.
 */
#include <stddef.h>
#include <string.h>
#include <linux/bpf.h>
#include <linux/pkt_cls.h>
#include "bpf_helpers.h"

int _version SEC("version") = 1;

#if  __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__

#define TEST_FIELD(TYPE, FIELD, MASK)					\
	{                                                               \
                TYPE tmp = *(volatile TYPE *)&skb->FIELD;               \
                if (tmp != ((*(volatile __u32 *)&skb->FIELD) & MASK))   \
                        return TC_ACT_SHOT;                             \
        }
#else

#define TEST_FIELD_OFFSET(a, b)	((sizeof(a) - sizeof(b)) / sizeof(b))

#define TEST_FIELD(TYPE, FIELD, MASK)					\
	{                                                               \
                TYPE tmp = *((volatile TYPE *)&skb->FIELD +             \
                              TEST_FIELD_OFFSET(skb->FIELD, TYPE));     \
                if (tmp != ((*(volatile __u32 *)&skb->FIELD) & MASK))   \
                        return TC_ACT_SHOT;                             \
        }
#endif

SEC("test1")


int process(struct __sk_buff *skb)
{
	TEST_FIELD(__u8,  len, 0xFF);
	TEST_FIELD(__u16, len, 0xFFFF);
	TEST_FIELD(__u32, len, 0xFFFFFFFF);
	TEST_FIELD(__u16, protocol, 0xFFFF);
	TEST_FIELD(__u32, protocol, 0xFFFFFFFF);
	TEST_FIELD(__u8,  hash, 0xFF);
	TEST_FIELD(__u16, hash, 0xFFFF);
	TEST_FIELD(__u32, hash, 0xFFFFFFFF);

	return TC_ACT_OK;
}
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Directory: tools/testing/selftests/bpf

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