pfxlen.c 8.1 KB

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