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 */
151const union nf_inet_addr ip_set_netmask_map[] = {
152	PREFIXES_MAP
153};
154EXPORT_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 */
165const union nf_inet_addr ip_set_hostmask_map[] = {
166	PREFIXES_MAP
167};
168EXPORT_SYMBOL_GPL(ip_set_hostmask_map);
169
170/* Find the largest network which matches the range from left, in host order. */
171u32
172ip_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}
189EXPORT_SYMBOL_GPL(ip_set_range_to_cidr);
190