vx32

Local 9vx git repository for patches.
git clone git://r-36.net/vx32
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classmask.c (1908B)

      1 #include "u.h"
      2 #include "lib.h"
      3 #include "ip.h"
      4 
      5 static 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 static uchar v6loopback[IPaddrlen] = {
     13 	0, 0, 0, 0,
     14 	0, 0, 0, 0,
     15 	0, 0, 0, 0,
     16 	0, 0, 0, 0x01
     17 };
     18 
     19 static uchar v6linklocal[IPaddrlen] = {
     20 	0xfe, 0x80, 0, 0,
     21 	0, 0, 0, 0,
     22 	0, 0, 0, 0,
     23 	0, 0, 0, 0
     24 };
     25 static uchar v6linklocalmask[IPaddrlen] = {
     26 	0xff, 0xff, 0xff, 0xff,
     27 	0xff, 0xff, 0xff, 0xff,
     28 	0, 0, 0, 0,
     29 	0, 0, 0, 0
     30 };
     31 static int v6llpreflen = 8;	/* link-local prefix length in bytes */
     32 
     33 static uchar v6multicast[IPaddrlen] = {
     34 	0xff, 0, 0, 0,
     35 	0, 0, 0, 0,
     36 	0, 0, 0, 0,
     37 	0, 0, 0, 0
     38 };
     39 static uchar v6multicastmask[IPaddrlen] = {
     40 	0xff, 0, 0, 0,
     41 	0, 0, 0, 0,
     42 	0, 0, 0, 0,
     43 	0, 0, 0, 0
     44 };
     45 static int v6mcpreflen = 1;	/* multicast prefix length */
     46 
     47 static uchar v6solicitednode[IPaddrlen] = {
     48 	0xff, 0x02, 0, 0,
     49 	0, 0, 0, 0,
     50 	0, 0, 0, 0x01,
     51 	0xff, 0, 0, 0
     52 };
     53 static uchar v6solicitednodemask[IPaddrlen] = {
     54 	0xff, 0xff, 0xff, 0xff,
     55 	0xff, 0xff, 0xff, 0xff,
     56 	0xff, 0xff, 0xff, 0xff,
     57 	0xff, 0x0, 0x0, 0x0
     58 };
     59 static int v6snpreflen = 13;
     60 
     61 uchar*
     62 defmask(uchar *ip)
     63 {
     64 	if(isv4(ip))
     65 		return classmask[ip[IPv4off]>>6];
     66 	else {
     67 		if(ipcmp(ip, v6loopback) == 0)
     68 			return IPallbits;
     69 		else if(memcmp(ip, v6linklocal, v6llpreflen) == 0)
     70 			return v6linklocalmask;
     71 		else if(memcmp(ip, v6solicitednode, v6snpreflen) == 0)
     72 			return v6solicitednodemask;
     73 		else if(memcmp(ip, v6multicast, v6mcpreflen) == 0)
     74 			return v6multicastmask;
     75 		return IPallbits;
     76 	}
     77 }
     78 
     79 void
     80 maskip(uchar *from, uchar *mask, uchar *to)
     81 {
     82 	int i;
     83 
     84 	for(i = 0; i < IPaddrlen; i++)
     85 		to[i] = from[i] & mask[i];
     86 }