root/include/linux/netfilter/ipset/pfxlen.h

INCLUDED FROM

DEFINITIONS

1. ip_set_netmask
2. ip_set_netmask6
3. ip_set_hostmask
4. ip_set_hostmask6
5. ip6_netmask

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _PFXLEN_H
   3 #define _PFXLEN_H
   4 
   5 #include <asm/byteorder.h>
   6 #include <linux/netfilter.h>
   7 #include <net/tcp.h>
   8 
   9 /* Prefixlen maps, by Jan Engelhardt  */
  10 extern const union nf_inet_addr ip_set_netmask_map[];
  11 extern const union nf_inet_addr ip_set_hostmask_map[];
  12 
  13 static inline __be32
  14 ip_set_netmask(u8 pfxlen)
  15 {
  16         return ip_set_netmask_map[pfxlen].ip;
  17 }
  18 
  19 static inline const __be32 *
  20 ip_set_netmask6(u8 pfxlen)
  21 {
  22         return &ip_set_netmask_map[pfxlen].ip6[0];
  23 }
  24 
  25 static inline u32
  26 ip_set_hostmask(u8 pfxlen)
  27 {
  28         return (__force u32) ip_set_hostmask_map[pfxlen].ip;
  29 }
  30 
  31 static inline const __be32 *
  32 ip_set_hostmask6(u8 pfxlen)
  33 {
  34         return &ip_set_hostmask_map[pfxlen].ip6[0];
  35 }
  36 
  37 extern u32 ip_set_range_to_cidr(u32 from, u32 to, u8 *cidr);
  38 
  39 #define ip_set_mask_from_to(from, to, cidr)     \
  40 do {                                            \
  41         from &= ip_set_hostmask(cidr);          \
  42         to = from | ~ip_set_hostmask(cidr);     \
  43 } while (0)
  44 
  45 static inline void
  46 ip6_netmask(union nf_inet_addr *ip, u8 prefix)
  47 {
  48         ip->ip6[0] &= ip_set_netmask6(prefix)[0];
  49         ip->ip6[1] &= ip_set_netmask6(prefix)[1];
  50         ip->ip6[2] &= ip_set_netmask6(prefix)[2];
  51         ip->ip6[3] &= ip_set_netmask6(prefix)[3];
  52 }
  53 
  54 #endif /*_PFXLEN_H */