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/net/netfilter/ipset/pfxlen.c

http://github.com/mirrors/linux
C | 189 lines | 171 code | 9 blank | 9 comment | 4 complexity | cea9be32b14dd9e3ca7897d1f5be4cf9 MD5 | raw file
  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);