netfilter/ipset/pfxlen.c

0001 // SPDX-License-Identifier: GPL-2.0-only
0002 #include <linux/export.h>
0003 #include <linux/netfilter/ipset/pfxlen.h>
0004
0005 /* Prefixlen maps for fast conversions, by Jan Engelhardt. */
0006
0007 #ifdef E
0008 #undef E
0009 #endif
0010
0011 #define PREFIXES_MAP                        \
0012     E(0x00000000, 0x00000000, 0x00000000, 0x00000000),  \
0013     E(0x80000000, 0x00000000, 0x00000000, 0x00000000),  \
0014     E(0xC0000000, 0x00000000, 0x00000000, 0x00000000),  \
0015     E(0xE0000000, 0x00000000, 0x00000000, 0x00000000),  \
0016     E(0xF0000000, 0x00000000, 0x00000000, 0x00000000),  \
0017     E(0xF8000000, 0x00000000, 0x00000000, 0x00000000),  \
0018     E(0xFC000000, 0x00000000, 0x00000000, 0x00000000),  \
0019     E(0xFE000000, 0x00000000, 0x00000000, 0x00000000),  \
0020     E(0xFF000000, 0x00000000, 0x00000000, 0x00000000),  \
0021     E(0xFF800000, 0x00000000, 0x00000000, 0x00000000),  \
0022     E(0xFFC00000, 0x00000000, 0x00000000, 0x00000000),  \
0023     E(0xFFE00000, 0x00000000, 0x00000000, 0x00000000),  \
0024     E(0xFFF00000, 0x00000000, 0x00000000, 0x00000000),  \
0025     E(0xFFF80000, 0x00000000, 0x00000000, 0x00000000),  \
0026     E(0xFFFC0000, 0x00000000, 0x00000000, 0x00000000),  \
0027     E(0xFFFE0000, 0x00000000, 0x00000000, 0x00000000),  \
0028     E(0xFFFF0000, 0x00000000, 0x00000000, 0x00000000),  \
0029     E(0xFFFF8000, 0x00000000, 0x00000000, 0x00000000),  \
0030     E(0xFFFFC000, 0x00000000, 0x00000000, 0x00000000),  \
0031     E(0xFFFFE000, 0x00000000, 0x00000000, 0x00000000),  \
0032     E(0xFFFFF000, 0x00000000, 0x00000000, 0x00000000),  \
0033     E(0xFFFFF800, 0x00000000, 0x00000000, 0x00000000),  \
0034     E(0xFFFFFC00, 0x00000000, 0x00000000, 0x00000000),  \
0035     E(0xFFFFFE00, 0x00000000, 0x00000000, 0x00000000),  \
0036     E(0xFFFFFF00, 0x00000000, 0x00000000, 0x00000000),  \
0037     E(0xFFFFFF80, 0x00000000, 0x00000000, 0x00000000),  \
0038     E(0xFFFFFFC0, 0x00000000, 0x00000000, 0x00000000),  \
0039     E(0xFFFFFFE0, 0x00000000, 0x00000000, 0x00000000),  \
0040     E(0xFFFFFFF0, 0x00000000, 0x00000000, 0x00000000),  \
0041     E(0xFFFFFFF8, 0x00000000, 0x00000000, 0x00000000),  \
0042     E(0xFFFFFFFC, 0x00000000, 0x00000000, 0x00000000),  \
0043     E(0xFFFFFFFE, 0x00000000, 0x00000000, 0x00000000),  \
0044     E(0xFFFFFFFF, 0x00000000, 0x00000000, 0x00000000),  \
0045     E(0xFFFFFFFF, 0x80000000, 0x00000000, 0x00000000),  \
0046     E(0xFFFFFFFF, 0xC0000000, 0x00000000, 0x00000000),  \
0047     E(0xFFFFFFFF, 0xE0000000, 0x00000000, 0x00000000),  \
0048     E(0xFFFFFFFF, 0xF0000000, 0x00000000, 0x00000000),  \
0049     E(0xFFFFFFFF, 0xF8000000, 0x00000000, 0x00000000),  \
0050     E(0xFFFFFFFF, 0xFC000000, 0x00000000, 0x00000000),  \
0051     E(0xFFFFFFFF, 0xFE000000, 0x00000000, 0x00000000),  \
0052     E(0xFFFFFFFF, 0xFF000000, 0x00000000, 0x00000000),  \
0053     E(0xFFFFFFFF, 0xFF800000, 0x00000000, 0x00000000),  \
0054     E(0xFFFFFFFF, 0xFFC00000, 0x00000000, 0x00000000),  \
0055     E(0xFFFFFFFF, 0xFFE00000, 0x00000000, 0x00000000),  \
0056     E(0xFFFFFFFF, 0xFFF00000, 0x00000000, 0x00000000),  \
0057     E(0xFFFFFFFF, 0xFFF80000, 0x00000000, 0x00000000),  \
0058     E(0xFFFFFFFF, 0xFFFC0000, 0x00000000, 0x00000000),  \
0059     E(0xFFFFFFFF, 0xFFFE0000, 0x00000000, 0x00000000),  \
0060     E(0xFFFFFFFF, 0xFFFF0000, 0x00000000, 0x00000000),  \
0061     E(0xFFFFFFFF, 0xFFFF8000, 0x00000000, 0x00000000),  \
0062     E(0xFFFFFFFF, 0xFFFFC000, 0x00000000, 0x00000000),  \
0063     E(0xFFFFFFFF, 0xFFFFE000, 0x00000000, 0x00000000),  \
0064     E(0xFFFFFFFF, 0xFFFFF000, 0x00000000, 0x00000000),  \
0065     E(0xFFFFFFFF, 0xFFFFF800, 0x00000000, 0x00000000),  \
0066     E(0xFFFFFFFF, 0xFFFFFC00, 0x00000000, 0x00000000),  \
0067     E(0xFFFFFFFF, 0xFFFFFE00, 0x00000000, 0x00000000),  \
0068     E(0xFFFFFFFF, 0xFFFFFF00, 0x00000000, 0x00000000),  \
0069     E(0xFFFFFFFF, 0xFFFFFF80, 0x00000000, 0x00000000),  \
0070     E(0xFFFFFFFF, 0xFFFFFFC0, 0x00000000, 0x00000000),  \
0071     E(0xFFFFFFFF, 0xFFFFFFE0, 0x00000000, 0x00000000),  \
0072     E(0xFFFFFFFF, 0xFFFFFFF0, 0x00000000, 0x00000000),  \
0073     E(0xFFFFFFFF, 0xFFFFFFF8, 0x00000000, 0x00000000),  \
0074     E(0xFFFFFFFF, 0xFFFFFFFC, 0x00000000, 0x00000000),  \
0075     E(0xFFFFFFFF, 0xFFFFFFFE, 0x00000000, 0x00000000),  \
0076     E(0xFFFFFFFF, 0xFFFFFFFF, 0x00000000, 0x00000000),  \
0077     E(0xFFFFFFFF, 0xFFFFFFFF, 0x80000000, 0x00000000),  \
0078     E(0xFFFFFFFF, 0xFFFFFFFF, 0xC0000000, 0x00000000),  \
0079     E(0xFFFFFFFF, 0xFFFFFFFF, 0xE0000000, 0x00000000),  \
0080     E(0xFFFFFFFF, 0xFFFFFFFF, 0xF0000000, 0x00000000),  \
0081     E(0xFFFFFFFF, 0xFFFFFFFF, 0xF8000000, 0x00000000),  \
0082     E(0xFFFFFFFF, 0xFFFFFFFF, 0xFC000000, 0x00000000),  \
0083     E(0xFFFFFFFF, 0xFFFFFFFF, 0xFE000000, 0x00000000),  \
0084     E(0xFFFFFFFF, 0xFFFFFFFF, 0xFF000000, 0x00000000),  \
0085     E(0xFFFFFFFF, 0xFFFFFFFF, 0xFF800000, 0x00000000),  \
0086     E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFC00000, 0x00000000),  \
0087     E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFE00000, 0x00000000),  \
0088     E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFF00000, 0x00000000),  \
0089     E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFF80000, 0x00000000),  \
0090     E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFC0000, 0x00000000),  \
0091     E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFE0000, 0x00000000),  \
0092     E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFF0000, 0x00000000),  \
0093     E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFF8000, 0x00000000),  \
0094     E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFC000, 0x00000000),  \
0095     E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFE000, 0x00000000),  \
0096     E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFF000, 0x00000000),  \
0097     E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFF800, 0x00000000),  \
0098     E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFC00, 0x00000000),  \
0099     E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFE00, 0x00000000),  \
0100     E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFF00, 0x00000000),  \
0101     E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFF80, 0x00000000),  \
0102     E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFC0, 0x00000000),  \
0103     E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFE0, 0x00000000),  \
0104     E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFF0, 0x00000000),  \
0105     E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFF8, 0x00000000),  \
0106     E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFC, 0x00000000),  \
0107     E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFE, 0x00000000),  \
0108     E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0x00000000),  \
0109     E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0x80000000),  \
0110     E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xC0000000),  \
0111     E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xE0000000),  \
0112     E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xF0000000),  \
0113     E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xF8000000),  \
0114     E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFC000000),  \
0115     E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFE000000),  \
0116     E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFF000000),  \
0117     E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFF800000),  \
0118     E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFC00000),  \
0119     E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFE00000),  \
0120     E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFF00000),  \
0121     E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFF80000),  \
0122     E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFC0000),  \
0123     E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFE0000),  \
0124     E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFF0000),  \
0125     E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFF8000),  \
0126     E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFC000),  \
0127     E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFE000),  \
0128     E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFF000),  \
0129     E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFF800),  \
0130     E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFC00),  \
0131     E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFE00),  \
0132     E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFF00),  \
0133     E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFF80),  \
0134     E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFC0),  \
0135     E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFE0),  \
0136     E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFF0),  \
0137     E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFF8),  \
0138     E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFC),  \
0139     E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFE),  \
0140     E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF),
0141
0142 #define E(a, b, c, d) \
0143     {.ip6 = { \
0144         htonl(a), htonl(b), \
0145         htonl(c), htonl(d), \
0146     } }
0147
0148 /* This table works for both IPv4 and IPv6;
0149  * just use prefixlen_netmask_map[prefixlength].ip.
0150  */
0151 const union nf_inet_addr ip_set_netmask_map[] = {
0152     PREFIXES_MAP
0153 };
0154 EXPORT_SYMBOL_GPL(ip_set_netmask_map);
0155
0156 #undef  E
0157 #define E(a, b, c, d)                   \
0158     {.ip6 = { (__force __be32)a, (__force __be32)b, \
0159           (__force __be32)c, (__force __be32)d, \
0160     } }
0161
0162 /* This table works for both IPv4 and IPv6;
0163  * just use prefixlen_hostmask_map[prefixlength].ip.
0164  */
0165 const union nf_inet_addr ip_set_hostmask_map[] = {
0166     PREFIXES_MAP
0167 };
0168 EXPORT_SYMBOL_GPL(ip_set_hostmask_map);
0169
0170 /* Find the largest network which matches the range from left, in host order. */
0171 u32
0172 ip_set_range_to_cidr(u32 from, u32 to, u8 *cidr)
0173 {
0174     u32 last;
0175     u8 i;
0176
0177     for (i = 1; i < 32; i++) {
0178         if ((from & ip_set_hostmask(i)) != from)
0179             continue;
0180         last = from | ~ip_set_hostmask(i);
0181         if (!after(last, to)) {
0182             *cidr = i;
0183             return last;
0184         }
0185     }
0186     *cidr = 32;
0187     return from;
0188 }
0189 EXPORT_SYMBOL_GPL(ip_set_range_to_cidr);