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

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  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 */
 55 

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