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add libip

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rsc 2003-11-23 18:23:20 +00:00
parent 99947423b1
commit d709423926
13 changed files with 875 additions and 0 deletions
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25
src/libip/classmask.c Normal file
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#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];
}