net/netfilter/ipset/pfxlen.c

   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);