Subversion Repositories planix.SVN

#include <u.h>
#include <libc.h>
#include <ip.h>

static 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,
};

static uchar v6loopback[IPaddrlen] = {
        0, 0, 0, 0,
        0, 0, 0, 0,
        0, 0, 0, 0,
        0, 0, 0, 0x01
};

static uchar v6linklocal[IPaddrlen] = {
        0xfe, 0x80, 0, 0,
        0, 0, 0, 0,
        0, 0, 0, 0,
        0, 0, 0, 0
};
static uchar v6linklocalmask[IPaddrlen] = {
        0xff, 0xff, 0xff, 0xff,
        0xff, 0xff, 0xff, 0xff,
        0, 0, 0, 0,
        0, 0, 0, 0
};
static int v6llpreflen = 8;     /* link-local prefix length in bytes */

static uchar v6multicast[IPaddrlen] = {
        0xff, 0, 0, 0,
        0, 0, 0, 0,
        0, 0, 0, 0,
        0, 0, 0, 0
};
static uchar v6multicastmask[IPaddrlen] = {
        0xff, 0, 0, 0,
        0, 0, 0, 0,
        0, 0, 0, 0,
        0, 0, 0, 0
};
static int v6mcpreflen = 1;     /* multicast prefix length */

static uchar v6solicitednode[IPaddrlen] = {
        0xff, 0x02, 0, 0,
        0, 0, 0, 0,
        0, 0, 0, 0x01,
        0xff, 0, 0, 0
};
static uchar v6solicitednodemask[IPaddrlen] = {
        0xff, 0xff, 0xff, 0xff,
        0xff, 0xff, 0xff, 0xff,
        0xff, 0xff, 0xff, 0xff,
        0xff, 0x0, 0x0, 0x0
};
static int v6snpreflen = 13;

uchar*
defmask(uchar *ip)
{
        if(isv4(ip))
                return classmask[ip[IPv4off]>>6];
        else {
                if(ipcmp(ip, v6loopback) == 0)
                        return IPallbits;
                else if(memcmp(ip, v6linklocal, v6llpreflen) == 0)
                        return v6linklocalmask;
                else if(memcmp(ip, v6solicitednode, v6snpreflen) == 0)
                        return v6solicitednodemask;
                else if(memcmp(ip, v6multicast, v6mcpreflen) == 0)
                        return v6multicastmask;
                return IPallbits;
        }
}

void
maskip(uchar *from, uchar *mask, uchar *to)
{
        int i;

        for(i = 0; i < IPaddrlen; i++)
                to[i] = from[i] & mask[i];
}