pfxlen.h

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#ifndef _PFXLEN_H
#define _PFXLEN_H

#include <asm/byteorder.h>
#include <linux/netfilter.h>
#include <net/tcp.h>

/* Prefixlen maps, by Jan Engelhardt  */
extern const union nf_inet_addr ip_set_netmask_map[];
extern const union nf_inet_addr ip_set_hostmask_map[];

static inline __be32
ip_set_netmask(u8 pfxlen)
{
    return ip_set_netmask_map[pfxlen].ip;
}

static inline const __be32 *
ip_set_netmask6(u8 pfxlen)
{
    return &ip_set_netmask_map[pfxlen].ip6[0];
}

static inline u32
ip_set_hostmask(u8 pfxlen)
{
    return (__force u32) ip_set_hostmask_map[pfxlen].ip;
}

static inline const __be32 *
ip_set_hostmask6(u8 pfxlen)
{
    return &ip_set_hostmask_map[pfxlen].ip6[0];
}

extern u32 ip_set_range_to_cidr(u32 from, u32 to, u8 *cidr);

#define ip_set_mask_from_to(from, to, cidr) \
do {                        \
    from &= ip_set_hostmask(cidr);      \
    to = from | ~ip_set_hostmask(cidr); \
} while (0)

#endif /*_PFXLEN_H */