1 d7094239 2003-11-23 devnull #include <u.h>
 2 d7094239 2003-11-23 devnull #include <libc.h>
 3 d7094239 2003-11-23 devnull #include <ip.h>
 4 d7094239 2003-11-23 devnull 
 5 d7094239 2003-11-23 devnull uchar classmask[4][16] = {
 6 d7094239 2003-11-23 devnull 	0xff,0xff,0xff,0xff,  0xff,0xff,0xff,0xff,  0xff,0xff,0xff,0xff,  0xff,0x00,0x00,0x00,
 7 d7094239 2003-11-23 devnull 	0xff,0xff,0xff,0xff,  0xff,0xff,0xff,0xff,  0xff,0xff,0xff,0xff,  0xff,0x00,0x00,0x00,
 8 d7094239 2003-11-23 devnull 	0xff,0xff,0xff,0xff,  0xff,0xff,0xff,0xff,  0xff,0xff,0xff,0xff,  0xff,0xff,0x00,0x00,
 9 d7094239 2003-11-23 devnull 	0xff,0xff,0xff,0xff,  0xff,0xff,0xff,0xff,  0xff,0xff,0xff,0xff,  0xff,0xff,0xff,0x00,
10 d7094239 2003-11-23 devnull };
11 d7094239 2003-11-23 devnull 
12 d7094239 2003-11-23 devnull uchar*
13 d7094239 2003-11-23 devnull defmask(uchar *ip)
14 d7094239 2003-11-23 devnull {
15 d7094239 2003-11-23 devnull 	return classmask[ip[IPv4off]>>6];
16 d7094239 2003-11-23 devnull }
17 d7094239 2003-11-23 devnull 
18 d7094239 2003-11-23 devnull void
19 d7094239 2003-11-23 devnull maskip(uchar *from, uchar *mask, uchar *to)
20 d7094239 2003-11-23 devnull {
21 d7094239 2003-11-23 devnull 	int i;
22 d7094239 2003-11-23 devnull 
23 d7094239 2003-11-23 devnull 	for(i = 0; i < IPaddrlen; i++)
24 d7094239 2003-11-23 devnull 		to[i] = from[i] & mask[i];
25 d7094239 2003-11-23 devnull }