87 lines
1.9 KiB
C
87 lines
1.9 KiB
C
#include <u.h>
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#include <libc.h>
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#include <ip.h>
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static uchar classmask[4][16] = {
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0xff,0xff,0xff,0xff, 0xff,0xff,0xff,0xff, 0xff,0xff,0xff,0xff, 0xff,0x00,0x00,0x00,
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0xff,0xff,0xff,0xff, 0xff,0xff,0xff,0xff, 0xff,0xff,0xff,0xff, 0xff,0x00,0x00,0x00,
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0xff,0xff,0xff,0xff, 0xff,0xff,0xff,0xff, 0xff,0xff,0xff,0xff, 0xff,0xff,0x00,0x00,
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0xff,0xff,0xff,0xff, 0xff,0xff,0xff,0xff, 0xff,0xff,0xff,0xff, 0xff,0xff,0xff,0x00,
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};
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static uchar v6loopback[IPaddrlen] = {
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0, 0, 0, 0,
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0, 0, 0, 0,
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0, 0, 0, 0,
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0, 0, 0, 0x01
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};
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static uchar v6linklocal[IPaddrlen] = {
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0xfe, 0x80, 0, 0,
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0, 0, 0, 0,
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0, 0, 0, 0,
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0, 0, 0, 0
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};
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static uchar v6linklocalmask[IPaddrlen] = {
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0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff,
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0, 0, 0, 0,
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0, 0, 0, 0
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};
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static int v6llpreflen = 8; /* link-local prefix length in bytes */
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static uchar v6multicast[IPaddrlen] = {
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0xff, 0, 0, 0,
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0, 0, 0, 0,
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0, 0, 0, 0,
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0, 0, 0, 0
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};
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static uchar v6multicastmask[IPaddrlen] = {
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0xff, 0, 0, 0,
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0, 0, 0, 0,
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0, 0, 0, 0,
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0, 0, 0, 0
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};
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static int v6mcpreflen = 1; /* multicast prefix length */
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static uchar v6solicitednode[IPaddrlen] = {
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0xff, 0x02, 0, 0,
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0, 0, 0, 0,
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0, 0, 0, 0x01,
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0xff, 0, 0, 0
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};
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static uchar v6solicitednodemask[IPaddrlen] = {
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0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff,
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0xff, 0x0, 0x0, 0x0
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};
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static int v6snpreflen = 13;
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uchar*
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defmask(uchar *ip)
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{
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if(isv4(ip))
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return classmask[ip[IPv4off]>>6];
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else {
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if(ipcmp(ip, v6loopback) == 0)
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return IPallbits;
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else if(memcmp(ip, v6linklocal, v6llpreflen) == 0)
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return v6linklocalmask;
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else if(memcmp(ip, v6solicitednode, v6snpreflen) == 0)
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return v6solicitednodemask;
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else if(memcmp(ip, v6multicast, v6mcpreflen) == 0)
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return v6multicastmask;
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return IPallbits;
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}
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}
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void
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maskip(uchar *from, uchar *mask, uchar *to)
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{
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int i;
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for(i = 0; i < IPaddrlen; i++)
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to[i] = from[i] & mask[i];
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}
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