1 // SPDX-License-Identifier: GPL-2.0-only
2 #include <linux/export.h>
3 #include <linux/netfilter/ipset/pfxlen.h>
4
5 /* Prefixlen maps for fast conversions, by Jan Engelhardt. */
6
7 #ifdef E
8 #undef E
9 #endif
10
11 #define PREFIXES_MAP \
12 E(0x00000000, 0x00000000, 0x00000000, 0x00000000), \
13 E(0x80000000, 0x00000000, 0x00000000, 0x00000000), \
14 E(0xC0000000, 0x00000000, 0x00000000, 0x00000000), \
15 E(0xE0000000, 0x00000000, 0x00000000, 0x00000000), \
16 E(0xF0000000, 0x00000000, 0x00000000, 0x00000000), \
17 E(0xF8000000, 0x00000000, 0x00000000, 0x00000000), \
18 E(0xFC000000, 0x00000000, 0x00000000, 0x00000000), \
19 E(0xFE000000, 0x00000000, 0x00000000, 0x00000000), \
20 E(0xFF000000, 0x00000000, 0x00000000, 0x00000000), \
21 E(0xFF800000, 0x00000000, 0x00000000, 0x00000000), \
22 E(0xFFC00000, 0x00000000, 0x00000000, 0x00000000), \
23 E(0xFFE00000, 0x00000000, 0x00000000, 0x00000000), \
24 E(0xFFF00000, 0x00000000, 0x00000000, 0x00000000), \
25 E(0xFFF80000, 0x00000000, 0x00000000, 0x00000000), \
26 E(0xFFFC0000, 0x00000000, 0x00000000, 0x00000000), \
27 E(0xFFFE0000, 0x00000000, 0x00000000, 0x00000000), \
28 E(0xFFFF0000, 0x00000000, 0x00000000, 0x00000000), \
29 E(0xFFFF8000, 0x00000000, 0x00000000, 0x00000000), \
30 E(0xFFFFC000, 0x00000000, 0x00000000, 0x00000000), \
31 E(0xFFFFE000, 0x00000000, 0x00000000, 0x00000000), \
32 E(0xFFFFF000, 0x00000000, 0x00000000, 0x00000000), \
33 E(0xFFFFF800, 0x00000000, 0x00000000, 0x00000000), \
34 E(0xFFFFFC00, 0x00000000, 0x00000000, 0x00000000), \
35 E(0xFFFFFE00, 0x00000000, 0x00000000, 0x00000000), \
36 E(0xFFFFFF00, 0x00000000, 0x00000000, 0x00000000), \
37 E(0xFFFFFF80, 0x00000000, 0x00000000, 0x00000000), \
38 E(0xFFFFFFC0, 0x00000000, 0x00000000, 0x00000000), \
39 E(0xFFFFFFE0, 0x00000000, 0x00000000, 0x00000000), \
40 E(0xFFFFFFF0, 0x00000000, 0x00000000, 0x00000000), \
41 E(0xFFFFFFF8, 0x00000000, 0x00000000, 0x00000000), \
42 E(0xFFFFFFFC, 0x00000000, 0x00000000, 0x00000000), \
43 E(0xFFFFFFFE, 0x00000000, 0x00000000, 0x00000000), \
44 E(0xFFFFFFFF, 0x00000000, 0x00000000, 0x00000000), \
45 E(0xFFFFFFFF, 0x80000000, 0x00000000, 0x00000000), \
46 E(0xFFFFFFFF, 0xC0000000, 0x00000000, 0x00000000), \
47 E(0xFFFFFFFF, 0xE0000000, 0x00000000, 0x00000000), \
48 E(0xFFFFFFFF, 0xF0000000, 0x00000000, 0x00000000), \
49 E(0xFFFFFFFF, 0xF8000000, 0x00000000, 0x00000000), \
50 E(0xFFFFFFFF, 0xFC000000, 0x00000000, 0x00000000), \
51 E(0xFFFFFFFF, 0xFE000000, 0x00000000, 0x00000000), \
52 E(0xFFFFFFFF, 0xFF000000, 0x00000000, 0x00000000), \
53 E(0xFFFFFFFF, 0xFF800000, 0x00000000, 0x00000000), \
54 E(0xFFFFFFFF, 0xFFC00000, 0x00000000, 0x00000000), \
55 E(0xFFFFFFFF, 0xFFE00000, 0x00000000, 0x00000000), \
56 E(0xFFFFFFFF, 0xFFF00000, 0x00000000, 0x00000000), \
57 E(0xFFFFFFFF, 0xFFF80000, 0x00000000, 0x00000000), \
58 E(0xFFFFFFFF, 0xFFFC0000, 0x00000000, 0x00000000), \
59 E(0xFFFFFFFF, 0xFFFE0000, 0x00000000, 0x00000000), \
60 E(0xFFFFFFFF, 0xFFFF0000, 0x00000000, 0x00000000), \
61 E(0xFFFFFFFF, 0xFFFF8000, 0x00000000, 0x00000000), \
62 E(0xFFFFFFFF, 0xFFFFC000, 0x00000000, 0x00000000), \
63 E(0xFFFFFFFF, 0xFFFFE000, 0x00000000, 0x00000000), \
64 E(0xFFFFFFFF, 0xFFFFF000, 0x00000000, 0x00000000), \
65 E(0xFFFFFFFF, 0xFFFFF800, 0x00000000, 0x00000000), \
66 E(0xFFFFFFFF, 0xFFFFFC00, 0x00000000, 0x00000000), \
67 E(0xFFFFFFFF, 0xFFFFFE00, 0x00000000, 0x00000000), \
68 E(0xFFFFFFFF, 0xFFFFFF00, 0x00000000, 0x00000000), \
69 E(0xFFFFFFFF, 0xFFFFFF80, 0x00000000, 0x00000000), \
70 E(0xFFFFFFFF, 0xFFFFFFC0, 0x00000000, 0x00000000), \
71 E(0xFFFFFFFF, 0xFFFFFFE0, 0x00000000, 0x00000000), \
72 E(0xFFFFFFFF, 0xFFFFFFF0, 0x00000000, 0x00000000), \
73 E(0xFFFFFFFF, 0xFFFFFFF8, 0x00000000, 0x00000000), \
74 E(0xFFFFFFFF, 0xFFFFFFFC, 0x00000000, 0x00000000), \
75 E(0xFFFFFFFF, 0xFFFFFFFE, 0x00000000, 0x00000000), \
76 E(0xFFFFFFFF, 0xFFFFFFFF, 0x00000000, 0x00000000), \
77 E(0xFFFFFFFF, 0xFFFFFFFF, 0x80000000, 0x00000000), \
78 E(0xFFFFFFFF, 0xFFFFFFFF, 0xC0000000, 0x00000000), \
79 E(0xFFFFFFFF, 0xFFFFFFFF, 0xE0000000, 0x00000000), \
80 E(0xFFFFFFFF, 0xFFFFFFFF, 0xF0000000, 0x00000000), \
81 E(0xFFFFFFFF, 0xFFFFFFFF, 0xF8000000, 0x00000000), \
82 E(0xFFFFFFFF, 0xFFFFFFFF, 0xFC000000, 0x00000000), \
83 E(0xFFFFFFFF, 0xFFFFFFFF, 0xFE000000, 0x00000000), \
84 E(0xFFFFFFFF, 0xFFFFFFFF, 0xFF000000, 0x00000000), \
85 E(0xFFFFFFFF, 0xFFFFFFFF, 0xFF800000, 0x00000000), \
86 E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFC00000, 0x00000000), \
87 E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFE00000, 0x00000000), \
88 E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFF00000, 0x00000000), \
89 E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFF80000, 0x00000000), \
90 E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFC0000, 0x00000000), \
91 E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFE0000, 0x00000000), \
92 E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFF0000, 0x00000000), \
93 E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFF8000, 0x00000000), \
94 E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFC000, 0x00000000), \
95 E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFE000, 0x00000000), \
96 E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFF000, 0x00000000), \
97 E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFF800, 0x00000000), \
98 E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFC00, 0x00000000), \
99 E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFE00, 0x00000000), \
100 E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFF00, 0x00000000), \
101 E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFF80, 0x00000000), \
102 E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFC0, 0x00000000), \
103 E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFE0, 0x00000000), \
104 E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFF0, 0x00000000), \
105 E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFF8, 0x00000000), \
106 E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFC, 0x00000000), \
107 E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFE, 0x00000000), \
108 E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0x00000000), \
109 E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0x80000000), \
110 E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xC0000000), \
111 E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xE0000000), \
112 E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xF0000000), \
113 E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xF8000000), \
114 E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFC000000), \
115 E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFE000000), \
116 E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFF000000), \
117 E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFF800000), \
118 E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFC00000), \
119 E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFE00000), \
120 E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFF00000), \
121 E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFF80000), \
122 E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFC0000), \
123 E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFE0000), \
124 E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFF0000), \
125 E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFF8000), \
126 E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFC000), \
127 E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFE000), \
128 E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFF000), \
129 E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFF800), \
130 E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFC00), \
131 E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFE00), \
132 E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFF00), \
133 E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFF80), \
134 E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFC0), \
135 E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFE0), \
136 E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFF0), \
137 E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFF8), \
138 E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFC), \
139 E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFE), \
140 E(0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF),
141
142 #define E(a, b, c, d) \
143 {.ip6 = { \
144 htonl(a), htonl(b), \
145 htonl(c), htonl(d), \
146 } }
147
148 /* This table works for both IPv4 and IPv6;
149 * just use prefixlen_netmask_map[prefixlength].ip.
150 */
151 const union nf_inet_addr ip_set_netmask_map[] = {
152 PREFIXES_MAP
153 };
154 EXPORT_SYMBOL_GPL(ip_set_netmask_map);
155
156 #undef E
157 #define E(a, b, c, d) \
158 {.ip6 = { (__force __be32)a, (__force __be32)b, \
159 (__force __be32)c, (__force __be32)d, \
160 } }
161
162 /* This table works for both IPv4 and IPv6;
163 * just use prefixlen_hostmask_map[prefixlength].ip.
164 */
165 const union nf_inet_addr ip_set_hostmask_map[] = {
166 PREFIXES_MAP
167 };
168 EXPORT_SYMBOL_GPL(ip_set_hostmask_map);
169
170 /* Find the largest network which matches the range from left, in host order. */
171 u32
172 ip_set_range_to_cidr(u32 from, u32 to, u8 *cidr)
173 {
174 u32 last;
175 u8 i;
176
177 for (i = 1; i < 32; i++) {
178 if ((from & ip_set_hostmask(i)) != from)
179 continue;
180 last = from | ~ip_set_hostmask(i);
181 if (!after(last, to)) {
182 *cidr = i;
183 return last;
184 }
185 }
186 *cidr = 32;
187 return from;
188 }
189 EXPORT_SYMBOL_GPL(ip_set_range_to_cidr);
190
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