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// SPDX-License-Identifier: GPL-2.0-only
/* Copyright (c) 2017 Facebook
*/
#include <stddef.h>
#include <string.h>
#include <linux/bpf.h>
#include <linux/pkt_cls.h>
#include <bpf/bpf_helpers.h>
#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("tc")
int test_pkt_md_access(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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