projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| 251ef5bb | 1 | /* in_local.h 4.2 83/03/13 */ |
| c9e39370 SL |
2 | |
| 3 | /* | |
| 4 | * Internet definitions and variables | |
| 5 | * specific to installation at Berkeley. | |
| 6 | */ | |
| 7 | ||
| 8 | /* | |
| 9 | * Local subnetwork address mapping. | |
| 10 | * The standard scheme is: | |
| 11 | * internet address = network.local-part | |
| 12 | * where | |
| 13 | * network is between 8 and 34 bits | |
| 14 | * local-part is between 8 and 24 bits | |
| 15 | * | |
| 16 | * This is modified by interpreting network as 32 bits | |
| 17 | * and local-part as something between 8 and 23 bits | |
| 18 | * depending on the high bit in the local-part. When | |
| 19 | * the high bit in the local-part is a 1, the upper byte | |
| 20 | * is interpreted as a local network extension, and used | |
| 21 | * as the high byte in the network (extending it to 32 bits). | |
| 22 | * The additional 8 bits of network number are administered | |
| 23 | * locally and are not visible outside Berkeley, since | |
| 24 | * they're part of the local-part. | |
| 25 | */ | |
| 26 | /* network mappings */ | |
| 27 | #define CLASSA_LOCALNETMAP(n, in) \ | |
| 28 | (in) & 0x800000 ? (n) | (((in) & 0xef0000) << 8) : (n) | |
| 29 | #define CLASSB_LOCALNETMAP(n, in) \ | |
| 30 | (in) & 0x8000 ? (n) | (((in) & 0xef00) << 16) : (n) | |
| 31 | #define CLASSC_LOCALNETMAP(n, in) (n) | |
| 32 | ||
| 33 | /* local-part mappings */ | |
| 34 | #define CLASSA_LOCALHOSTMAP(h, in) \ | |
| 35 | (in) & 0x800000 ? (h) & ~0xef0000 : (h) | |
| 36 | #define CLASSB_LOCALHOSTMAP(h, in) \ | |
| 251ef5bb | 37 | (in) & 0x8000 ? (h) & ~0xef00 : (h) |
| c9e39370 | 38 | #define CLASSC_LOCALHOSTMAP(h, in) (h) |