diff options
| author | rsc <devnull@localhost> | 2003-11-23 18:23:20 +0000 |
|---|---|---|
| committer | rsc <devnull@localhost> | 2003-11-23 18:23:20 +0000 |
| commit | d7094239263eac816ebb3af32641079b7924c666 (patch) | |
| tree | 61b016942d567560042adf110f5fb558dc328a98 /src/libip/classmask.c | |
| parent | 99947423b136903263513b9022aab6586c8c6cc5 (diff) | |
| download | plan9port-d7094239263eac816ebb3af32641079b7924c666.tar.gz plan9port-d7094239263eac816ebb3af32641079b7924c666.tar.bz2 plan9port-d7094239263eac816ebb3af32641079b7924c666.zip | |
add libip
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]; +} |