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Linux/include/net/netfilter/nf_tables_core.h

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  1 /* SPDX-License-Identifier: GPL-2.0 */
  2 #ifndef _NET_NF_TABLES_CORE_H
  3 #define _NET_NF_TABLES_CORE_H
  4 
  5 extern struct nft_expr_type nft_imm_type;
  6 extern struct nft_expr_type nft_cmp_type;
  7 extern struct nft_expr_type nft_lookup_type;
  8 extern struct nft_expr_type nft_bitwise_type;
  9 extern struct nft_expr_type nft_byteorder_type;
 10 extern struct nft_expr_type nft_payload_type;
 11 extern struct nft_expr_type nft_dynset_type;
 12 extern struct nft_expr_type nft_range_type;
 13 
 14 int nf_tables_core_module_init(void);
 15 void nf_tables_core_module_exit(void);
 16 
 17 struct nft_cmp_fast_expr {
 18         u32                     data;
 19         enum nft_registers      sreg:8;
 20         u8                      len;
 21 };
 22 
 23 /* Calculate the mask for the nft_cmp_fast expression. On big endian the
 24  * mask needs to include the *upper* bytes when interpreting that data as
 25  * something smaller than the full u32, therefore a cpu_to_le32 is done.
 26  */
 27 static inline u32 nft_cmp_fast_mask(unsigned int len)
 28 {
 29         return cpu_to_le32(~0U >> (FIELD_SIZEOF(struct nft_cmp_fast_expr,
 30                                                 data) * BITS_PER_BYTE - len));
 31 }
 32 
 33 extern const struct nft_expr_ops nft_cmp_fast_ops;
 34 
 35 struct nft_payload {
 36         enum nft_payload_bases  base:8;
 37         u8                      offset;
 38         u8                      len;
 39         enum nft_registers      dreg:8;
 40 };
 41 
 42 struct nft_payload_set {
 43         enum nft_payload_bases  base:8;
 44         u8                      offset;
 45         u8                      len;
 46         enum nft_registers      sreg:8;
 47         u8                      csum_type;
 48         u8                      csum_offset;
 49         u8                      csum_flags;
 50 };
 51 
 52 extern const struct nft_expr_ops nft_payload_fast_ops;
 53 
 54 extern struct static_key_false nft_counters_enabled;
 55 extern struct static_key_false nft_trace_enabled;
 56 
 57 #endif /* _NET_NF_TABLES_CORE_H */
 58 

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