Orange Pi5 kernel

// 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>
 
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("classifier/test_pkt_md_access")
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;
}