/*  * This file is part of the UCB release of Plan 9. It is subject to the license * terms in the LICENSE file found in the top-level directory of this * distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No * part of the UCB release of Plan 9, including this file, may be copied, * modified, propagated, or distributed except according to the terms contained * in the LICENSE file. */ #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;	}} voidmaskip(uchar *from, uchar *mask, uchar *to){	int i; 	for(i = 0; i < IPaddrlen; i++)		to[i] = from[i] & mask[i];}