root/include/net/netfilter/nf_tables_core.h

DEFINITIONS

1. nft_cmp_fast_mask

#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 */