// SPDX-License-Identifier: GPL-2.0-only
#include <linux/export.h>
#include <linux/netfilter/ipset/pfxlen.h>

/* Prefixlen maps for fast conversions, by Jan Engelhardt. */

#ifdef E
#undef E
#endif

#define PREFIXES_MAP                                            \
        E(0x00000000, 0x00000000, 0x00000000, 0x00000000),      \
        E(0x80000000, 0x00000000, 0x00000000, 0x00000000),      \
        E(0xC0000000, 0x00000000, 0x00000000, 0x00000000),      \
        E(0xE0000000, 0x00000000, 0x00000000, 0x00000000),      \
        E(0xF0000000, 0x00000000, 0x00000000, 0x00000000),      \
        E(0xF8000000, 0x00000000, 0x00000000, 0x00000000),      \
        E(0xFC000000, 0x00000000, 0x00000000, 0x00000000),      \
        E(0xFE000000, 0x00000000, 0x00000000, 0x00000000),      \
        E(0xFF000000, 0x00000000, 0x00000000, 0x00000000),      \
        E(0xFF800000, 0x00000000, 0x00000000, 0x00000000),      \
        E(0xFFC00000, 0x00000000, 0x00000000, 0x00000000),      \
        E(0xFFE00000, 0x00000000, 0x00000000, 0x00000000),      \
        E(0xFFF00000, 0x00000000, 0x00000000, 0x00000000),      \
        E(0xFFF80000, 0x00000000, 0x00000000, 0x00000000),      \
        E(0xFFFC0000, 0x00000000, 0x00000000, 0x00000000),      \
        E(0xFFFE0000, 0x00000000, 0x00000000, 0x00000000),      \
        E(0xFFFF0000, 0x00000000, 0x00000000, 0x00000000),      \
        E(0xFFFF8000, 0x00000000, 0x00000000, 0x00000000),      \
        E(0xFFFFC000, 0x00000000, 0x00000000, 0x00000000),      \
        E(0xFFFFE000, 0x00000000, 0x00000000, 0x00000000),      \
        E(0xFFFFF000, 0x00000000, 0x00000000, 0x00000000),      \
        E(0xFFFFF800, 0x00000000, 0x00000000, 0x00000000),      \
        E(0xFFFFFC00, 0x00000000, 0x00000000, 0x00000000),      \
        E(0xFFFFFE00, 0x00000000, 0x00000000, 0x00000000),      \
        E(0xFFFFFF00, 0x00000000, 0x00000000, 0x00000000),      \
        E(0xFFFFFF80, 0x00000000, 0x00000000, 0x00000000),      \
        E(0xFFFFFFC0, 0x00000000, 0x00000000, 0x00000000),      \
        E(0xFFFFFFE0, 0x00000000, 0x00000000, 0x00000000),      \
        E(0xFFFFFFF0, 0x00000000, 0x00000000, 0x00000000),      \
        E(0xFFFFFFF8, 0x00000000, 0x00000000, 0x00000000),      \
        E(0xFFFFFFFC, 0x00000000, 0x00000000, 0x00000000),      \
        E(0xFFFFFFFE, 0x00000000, 0x00000000, 0x00000000),      \
        E(0xFFFFFFFF, 0x00000000, 0x00000000, 0x00000000),      \
        E(0xFFFFFFFF, 0x80000000, 0x00000000, 0x00000000),      \
        E(0xFFFFFFFF, 0xC0000000, 0x00000000, 0x00000000),      \
        E(0xFFFFFFFF, 0xE0000000, 0x00000000, 0x00000000),      \
        E(0xFFFFFFFF, 0xF0000000, 0x00000000, 0x00000000),      \
        E(0xFFFFFFFF, 0xF8000000, 0x00000000, 0x00000000),      \
        E(0xFFFFFFFF, 0xFC000000, 0x00000000, 0x00000000),      \
        E(0xFFFFFFFF, 0xFE000000, 0x00000000, 0x00000000),      \
        E(0xFFFFFFFF, 0xFF000000, 0x00000000, 0x00000000),      \
        E(0xFFFFFFFF, 0xFF800000, 0x00000000, 0x00000000),      \
        E(0xFFFFFFFF, 0xFFC00000, 0x00000000, 0x00000000),      \
        E(0xFFFFFFFF, 0xFFE00000, 0x00000000, 0x00000000),      \
        E(0xFFFFFFFF, 0xFFF00000, 0x00000000, 0x00000000),      \
        E(0xFFFFFFFF, 0xFFF80000, 0x00000000, 0x00000000),      \
        E(0xFFFFFFFF, 0xFFFC0000, 0x00000000, 0x00000000),      \
        E(0xFFFFFFFF, 0xFFFE0000, 0x00000000, 0x00000000),      \
        E(0xFFFFFFFF, 0xFFFF0000, 0x00000000, 0x00000000),      \
        E(0xFFFFFFFF, 0xFFFF8000, 0x00000000, 0x00000000),      \
        E(0xFFFFFFFF, 0xFFFFC000, 0x00000000, 0x00000000),      \
        E(0xFFFFFFFF, 0xFFFFE000, 0x00000000, 0x00000000),      \
        E(0xFFFFFFFF, 0xFFFFF000, 0x00000000, 0x00000000),      \
        E(0xFFFFFFFF, 0xFFFFF800, 0x00000000, 0x00000000),      \
        E(0xFFFFFFFF, 0xFFFFFC00, 0x00000000, 0x00000000),      \
        E(0xFFFFFFFF, 0xFFFFFE00, 0x00000000, 0x00000000),      \
        E(0xFFFFFFFF, 0xFFFFFF00, 0x00000000, 0x00000000),      \
        E(0xFFFFFFFF, 0xFFFFFF80, 0x00000000, 0x00000000),      \
        E(0xFFFFFFFF, 0xFFFFFFC0, 0x00000000, 0x00000000),      \
        E(0xFFFFFFFF, 0xFFFFFFE0, 0x00000000, 0x00000000),      \
        E(0xFFFFFFFF, 0xFFFFFFF0, 0x00000000, 0x00000000),      \
        E(0xFFFFFFFF, 0xFFFFFFF8, 0x00000000, 0x00000000),      \
        E(0xFFFFFFFF, 0xFFFFFFFC, 0x00000000, 0x00000000),      \
        E(0xFFFFFFFF, 0xFFFFFFFE, 0x00000000, 0x00000000),      \
        E(0xFFFFFFFF, 0xFFFFFFFF, 0x00000000, 0x00000000),      \
        E(0xFFFFFFFF, 0xFFFFFFFF, 0x80000000, 0x00000000),      \
        E(0xFFFFFFFF, 0xFFFFFFFF, 0xC0000000, 0x00000000),      \
        E(0xFFFFFFFF, 0xFFFFFFFF, 0xE0000000, 0x00000000),      \
        E(0xFFFFFFFF, 0xFFFFFFFF, 0xF0000000, 0x00000000),      \
        E(0xFFFFFFFF, 0xFFFFFFFF, 0xF8000000, 0x00000000),      \
        E(0xFFFFFFFF, 0xFFFFFFFF, 0xFC000000, 0x00000000),      \
        E(0xFFFFFFFF, 0xFFFFFFFF, 0xFE000000, 0x00000000),      \
        E(0xFFFFFFFF, 0xFFFFFFFF, 0xFF000000, 0x00000000),      \
        E(0xFFFFFFFF, 0xFFFFFFFF, 0xFF800000, 0x00000000),      \
        E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFC00000, 0x00000000),      \
        E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFE00000, 0x00000000),      \
        E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFF00000, 0x00000000),      \
        E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFF80000, 0x00000000),      \
        E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFC0000, 0x00000000),      \
        E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFE0000, 0x00000000),      \
        E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFF0000, 0x00000000),      \
        E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFF8000, 0x00000000),      \
        E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFC000, 0x00000000),      \
        E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFE000, 0x00000000),      \
        E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFF000, 0x00000000),      \
        E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFF800, 0x00000000),      \
        E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFC00, 0x00000000),      \
        E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFE00, 0x00000000),      \
        E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFF00, 0x00000000),      \
        E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFF80, 0x00000000),      \
        E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFC0, 0x00000000),      \
        E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFE0, 0x00000000),      \
        E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFF0, 0x00000000),      \
        E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFF8, 0x00000000),      \
        E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFC, 0x00000000),      \
        E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFE, 0x00000000),      \
        E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0x00000000),      \
        E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0x80000000),      \
        E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xC0000000),      \
        E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xE0000000),      \
        E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xF0000000),      \
        E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xF8000000),      \
        E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFC000000),      \
        E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFE000000),      \
        E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFF000000),      \
        E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFF800000),      \
        E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFC00000),      \
        E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFE00000),      \
        E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFF00000),      \
        E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFF80000),      \
        E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFC0000),      \
        E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFE0000),      \
        E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFF0000),      \
        E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFF8000),      \
        E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFC000),      \
        E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFE000),      \
        E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFF000),      \
        E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFF800),      \
        E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFC00),      \
        E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFE00),      \
        E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFF00),      \
        E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFF80),      \
        E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFC0),      \
        E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFE0),      \
        E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFF0),      \
        E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFF8),      \
        E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFC),      \
        E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFE),      \
        E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF),

#define E(a, b, c, d) \
        {.ip6 = { \
                htonl(a), htonl(b), \
                htonl(c), htonl(d), \
        } }

/* This table works for both IPv4 and IPv6;
 * just use prefixlen_netmask_map[prefixlength].ip.
 */
const union nf_inet_addr ip_set_netmask_map[] = {
        PREFIXES_MAP
};
EXPORT_SYMBOL_GPL(ip_set_netmask_map);

#undef  E
#define E(a, b, c, d)                                   \
        {.ip6 = { (__force __be32)a, (__force __be32)b, \
                  (__force __be32)c, (__force __be32)d, \
        } }

/* This table works for both IPv4 and IPv6;
 * just use prefixlen_hostmask_map[prefixlength].ip.
 */
const union nf_inet_addr ip_set_hostmask_map[] = {
        PREFIXES_MAP
};
EXPORT_SYMBOL_GPL(ip_set_hostmask_map);

/* Find the largest network which matches the range from left, in host order. */
u32
ip_set_range_to_cidr(u32 from, u32 to, u8 *cidr)
{
        u32 last;
        u8 i;

        for (i = 1; i < 32; i++) {
                if ((from & ip_set_hostmask(i)) != from)
                        continue;
                last = from | ~ip_set_hostmask(i);
                if (!after(last, to)) {
                        *cidr = i;
                        return last;
                }
        }
        *cidr = 32;
        return from;
}
EXPORT_SYMBOL_GPL(ip_set_range_to_cidr);