| rsc | d709423 | 2003-11-23 18:23:20 +0000 | [diff] [blame] | 1 | #include <u.h> |
| 2 | #include <libc.h> |
| 3 | #include <ip.h> |
| 4 | |
| 5 | uchar classmask[4][16] = { |
| 6 | 0xff,0xff,0xff,0xff, 0xff,0xff,0xff,0xff, 0xff,0xff,0xff,0xff, 0xff,0x00,0x00,0x00, |
| 7 | 0xff,0xff,0xff,0xff, 0xff,0xff,0xff,0xff, 0xff,0xff,0xff,0xff, 0xff,0x00,0x00,0x00, |
| 8 | 0xff,0xff,0xff,0xff, 0xff,0xff,0xff,0xff, 0xff,0xff,0xff,0xff, 0xff,0xff,0x00,0x00, |
| 9 | 0xff,0xff,0xff,0xff, 0xff,0xff,0xff,0xff, 0xff,0xff,0xff,0xff, 0xff,0xff,0xff,0x00, |
| 10 | }; |
| 11 | |
| 12 | uchar* |
| 13 | defmask(uchar *ip) |
| 14 | { |
| 15 | return classmask[ip[IPv4off]>>6]; |
| 16 | } |
| 17 | |
| 18 | void |
| 19 | maskip(uchar *from, uchar *mask, uchar *to) |
| 20 | { |
| 21 | int i; |
| 22 | |
| 23 | for(i = 0; i < IPaddrlen; i++) |
| 24 | to[i] = from[i] & mask[i]; |
| 25 | } |
