diff options
Diffstat (limited to 'src/libip/classmask.c')
-rw-r--r-- | src/libip/classmask.c | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/src/libip/classmask.c b/src/libip/classmask.c new file mode 100644 index 00000000..5932f878 --- /dev/null +++ b/src/libip/classmask.c @@ -0,0 +1,25 @@ +#include <u.h> +#include <libc.h> +#include <ip.h> + +uchar classmask[4][16] = { + 0xff,0xff,0xff,0xff, 0xff,0xff,0xff,0xff, 0xff,0xff,0xff,0xff, 0xff,0x00,0x00,0x00, + 0xff,0xff,0xff,0xff, 0xff,0xff,0xff,0xff, 0xff,0xff,0xff,0xff, 0xff,0x00,0x00,0x00, + 0xff,0xff,0xff,0xff, 0xff,0xff,0xff,0xff, 0xff,0xff,0xff,0xff, 0xff,0xff,0x00,0x00, + 0xff,0xff,0xff,0xff, 0xff,0xff,0xff,0xff, 0xff,0xff,0xff,0xff, 0xff,0xff,0xff,0x00, +}; + +uchar* +defmask(uchar *ip) +{ + return classmask[ip[IPv4off]>>6]; +} + +void +maskip(uchar *from, uchar *mask, uchar *to) +{ + int i; + + for(i = 0; i < IPaddrlen; i++) + to[i] = from[i] & mask[i]; +} |