netfilter: nf_tables: fix nft_cmp_fast failure on big endian for size < 4

[deliverable/linux.git] / include / net / netfilter / nf_tables_core.h

#ifndef _NET_NF_TABLES_CORE_H
#define _NET_NF_TABLES_CORE_H

int nf_tables_core_module_init(void);
void nf_tables_core_module_exit(void);

int nft_immediate_module_init(void);
void nft_immediate_module_exit(void);

struct nft_cmp_fast_expr {
	u32			data;
	enum nft_registers	sreg:8;
	u8			len;
};

/* Calculate the mask for the nft_cmp_fast expression. On big endian the
 * mask needs to include the *upper* bytes when interpreting that data as
 * something smaller than the full u32, therefore a cpu_to_le32 is done.
 */
static inline u32 nft_cmp_fast_mask(unsigned int len)
{
	return cpu_to_le32(~0U >> (FIELD_SIZEOF(struct nft_cmp_fast_expr,
						data) * BITS_PER_BYTE - len));
}

extern const struct nft_expr_ops nft_cmp_fast_ops;

int nft_cmp_module_init(void);
void nft_cmp_module_exit(void);

int nft_lookup_module_init(void);
void nft_lookup_module_exit(void);

int nft_bitwise_module_init(void);
void nft_bitwise_module_exit(void);

int nft_byteorder_module_init(void);
void nft_byteorder_module_exit(void);

struct nft_payload {
	enum nft_payload_bases	base:8;
	u8			offset;
	u8			len;
	enum nft_registers	dreg:8;
};

extern const struct nft_expr_ops nft_payload_fast_ops;

int nft_payload_module_init(void);
void nft_payload_module_exit(void);

#endif /* _NET_NF_TABLES_CORE_H */