include/net/netfilter/nf_tables_core.h

   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 */