ZeroTierOne/node/Filter.cpp

/*
 * ZeroTier One - Global Peer to Peer Ethernet
 * Copyright (C) 2012-2013  ZeroTier Networks LLC
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 * --
 *
 * ZeroTier may be used and distributed under the terms of the GPLv3, which
 * are available at: http://www.gnu.org/licenses/gpl-3.0.html
 *
 * If you would like to embed ZeroTier into a commercial application or
 * redistribute it in a modified binary form, please contact ZeroTier Networks
 * LLC. Start here: http://www.zerotier.com/
 */

#include <stdint.h>

#include "RuntimeEnvironment.hpp"
#include "Logger.hpp"
#include "Filter.hpp"

namespace ZeroTier {

bool Filter::Rule::operator()(unsigned int etype,const void *data,unsigned int len) const
{
	if ((_etherType >= 0)&&(etype != (unsigned int)_etherType))
		return false; // ethertype mismatch

	switch(etype) {
		case ZT_ETHERTYPE_IPV4:
			if (len < 20)
				return false; // invalid packets don't match
			if ((_protocol >= 0)&&(((const uint8_t *)data)[9] != (uint8_t)(_protocol & 0xff)))
				return false; // IP protocol # mismatch

			switch(((const uint8_t *)data)[9]) {
			}

			break;
		case ZT_ETHERTYPE_IPV6
			break;
	}

	return false;
}

Filter::Filter(const RuntimeEnvironment *renv) :
	_r(renv)
{
}

Filter::~Filter()
{
}

void Filter::add(const Rule &r,const Action &a)
{
	Mutex::Lock _l(_chain_m);
	for(std::vector<Entry>::iterator i(_chain.begin());i!=_chain.end();++i) {
		if (i->rule == r) {
			_chain.erase(i);
			break;
		}
	}
	_chain.push_back(Entry(r,a));
}

const char *Filter::etherTypeName(const unsigned int etherType)
	throw()
{
	static char tmp[6];
	switch(etherType) {
		case ZT_ETHERTYPE_IPV4:
			return "IPV4";
		case ZT_ETHERTYPE_ARP:
			return "ARP";
		case ZT_ETHERTYPE_RARP:
			return "RARP";
		case ZT_ETHERTYPE_ATALK:
			return "ATALK";
		case ZT_ETHERTYPE_AARP:
			return "AARP";
		case ZT_ETHERTYPE_IPX_A:
			return "IPX_A";
		case ZT_ETHERTYPE_IPX_B:
			return "IPX_B";
		case ZT_ETHERTYPE_IPV6:
			return "IPV6";
	}
	sprintf(tmp,"%.4x",etherType);
	return tmp; // technically not thread safe, but we're only going to see this in debugging if ever
}

} // namespace ZeroTier