mirror of
https://github.com/NAStools/zerotierone.git
synced 2024-09-19 08:50:21 -07:00
285 lines
8.2 KiB
C++
285 lines
8.2 KiB
C++
/*
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* ZeroTier One - Network Virtualization Everywhere
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* Copyright (C) 2011-2015 ZeroTier, Inc.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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* --
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*
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* ZeroTier may be used and distributed under the terms of the GPLv3, which
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* are available at: http://www.gnu.org/licenses/gpl-3.0.html
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*
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* If you would like to embed ZeroTier into a commercial application or
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* redistribute it in a modified binary form, please contact ZeroTier Networks
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* LLC. Start here: http://www.zerotier.com/
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*/
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#ifndef _ZT_FILTER_HPP
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#define _ZT_FILTER_HPP
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <string>
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#include <vector>
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#include <utility>
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#include <stdexcept>
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#include "Range.hpp"
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/* Ethernet frame types that might be relevant to us */
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#define ZT_ETHERTYPE_IPV4 0x0800
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#define ZT_ETHERTYPE_ARP 0x0806
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#define ZT_ETHERTYPE_RARP 0x8035
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#define ZT_ETHERTYPE_ATALK 0x809b
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#define ZT_ETHERTYPE_AARP 0x80f3
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#define ZT_ETHERTYPE_IPX_A 0x8137
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#define ZT_ETHERTYPE_IPX_B 0x8138
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#define ZT_ETHERTYPE_IPV6 0x86dd
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/* IP protocols we might care about */
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#define ZT_IPPROTO_ICMP 0x01
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#define ZT_IPPROTO_IGMP 0x02
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#define ZT_IPPROTO_TCP 0x06
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#define ZT_IPPROTO_UDP 0x11
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#define ZT_IPPROTO_GRE 0x2f
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#define ZT_IPPROTO_ESP 0x32
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#define ZT_IPPROTO_AH 0x33
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#define ZT_IPPROTO_ICMPV6 0x3a
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#define ZT_IPPROTO_OSPF 0x59
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#define ZT_IPPROTO_IPIP 0x5e
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#define ZT_IPPROTO_IPCOMP 0x6c
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#define ZT_IPPROTO_L2TP 0x73
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#define ZT_IPPROTO_SCTP 0x84
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#define ZT_IPPROTO_FC 0x85
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#define ZT_IPPROTO_UDPLITE 0x88
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#define ZT_IPPROTO_HIP 0x8b
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/* IPv4 ICMP types */
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#define ZT_ICMP_ECHO_REPLY 0
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#define ZT_ICMP_DESTINATION_UNREACHABLE 3
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#define ZT_ICMP_SOURCE_QUENCH 4
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#define ZT_ICMP_REDIRECT 5
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#define ZT_ICMP_ALTERNATE_HOST_ADDRESS 6
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#define ZT_ICMP_ECHO_REQUEST 8
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#define ZT_ICMP_ROUTER_ADVERTISEMENT 9
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#define ZT_ICMP_ROUTER_SOLICITATION 10
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#define ZT_ICMP_TIME_EXCEEDED 11
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#define ZT_ICMP_BAD_IP_HEADER 12
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#define ZT_ICMP_TIMESTAMP 13
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#define ZT_ICMP_TIMESTAMP_REPLY 14
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#define ZT_ICMP_INFORMATION_REQUEST 15
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#define ZT_ICMP_INFORMATION_REPLY 16
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#define ZT_ICMP_ADDRESS_MASK_REQUEST 17
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#define ZT_ICMP_ADDRESS_MASK_REPLY 18
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#define ZT_ICMP_TRACEROUTE 30
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#define ZT_ICMP_MOBILE_HOST_REDIRECT 32
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#define ZT_ICMP_MOBILE_REGISTRATION_REQUEST 35
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#define ZT_ICMP_MOBILE_REGISTRATION_REPLY 36
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/* IPv6 ICMP types */
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#define ZT_ICMP6_DESTINATION_UNREACHABLE 1
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#define ZT_ICMP6_PACKET_TOO_BIG 2
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#define ZT_ICMP6_TIME_EXCEEDED 3
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#define ZT_ICMP6_PARAMETER_PROBLEM 4
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#define ZT_ICMP6_ECHO_REQUEST 128
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#define ZT_ICMP6_ECHO_REPLY 129
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#define ZT_ICMP6_MULTICAST_LISTENER_QUERY 130
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#define ZT_ICMP6_MULTICAST_LISTENER_REPORT 131
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#define ZT_ICMP6_MULTICAST_LISTENER_DONE 132
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#define ZT_ICMP6_ROUTER_SOLICITATION 133
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#define ZT_ICMP6_ROUTER_ADVERTISEMENT 134
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#define ZT_ICMP6_NEIGHBOR_SOLICITATION 135
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#define ZT_ICMP6_NEIGHBOR_ADVERTISEMENT 136
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#define ZT_ICMP6_REDIRECT_MESSAGE 137
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#define ZT_ICMP6_ROUTER_RENUMBERING 138
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#define ZT_ICMP6_NODE_INFORMATION_QUERY 139
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#define ZT_ICMP6_NODE_INFORMATION_RESPONSE 140
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#define ZT_ICMP6_INV_NEIGHBOR_SOLICITATION 141
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#define ZT_ICMP6_INV_NEIGHBOR_ADVERTISEMENT 142
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#define ZT_ICMP6_MLDV2 143
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#define ZT_ICMP6_HOME_AGENT_ADDRESS_DISCOVERY_REQUEST 144
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#define ZT_ICMP6_HOME_AGENT_ADDRESS_DISCOVERY_REPLY 145
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#define ZT_ICMP6_MOBILE_PREFIX_SOLICITATION 146
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#define ZT_ICMP6_MOBILE_PREFIX_ADVERTISEMENT 147
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#define ZT_ICMP6_CERTIFICATION_PATH_SOLICITATION 148
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#define ZT_ICMP6_CERTIFICATION_PATH_ADVERTISEMENT 149
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#define ZT_ICMP6_MULTICAST_ROUTER_ADVERTISEMENT 151
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#define ZT_ICMP6_MULTICAST_ROUTER_SOLICITATION 152
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#define ZT_ICMP6_MULTICAST_ROUTER_TERMINATION 153
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#define ZT_ICMP6_RPL_CONTROL_MESSAGE 155
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namespace ZeroTier {
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class RuntimeEnvironment;
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/**
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* A simple Ethernet frame level filter
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*
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* This doesn't specify actions, since it's used as a deny filter. The rule
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* in ZT1 is "that which is not explicitly prohibited is allowed." (Except for
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* ethertypes, which are handled by a whitelist.)
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*/
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class Filter
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{
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public:
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/**
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* Value returned by etherTypeName, etc. on unknown
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*
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* These static methods return precisely this, so a pointer equality
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* check will work.
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*/
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static const char *const UNKNOWN_NAME;
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/**
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* An empty range as a more idiomatic way of specifying a wildcard match
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*/
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static const Range<unsigned int> ANY;
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/**
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* A filter rule
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*/
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class Rule
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{
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public:
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Rule()
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throw() :
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_etherType(),
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_protocol(),
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_port()
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{
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}
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/**
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* Construct a rule from a string-serialized value
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*
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* @param s String formatted rule, such as returned by toString()
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* @throws std::invalid_argument String formatted rule is not valid
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*/
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Rule(const char *s)
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throw(std::invalid_argument);
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/**
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* Construct a new rule
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*
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* @param etype Ethernet type or empty range for ANY
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* @param prot Protocol or empty range for ANY (meaning depends on ethertype, e.g. IP protocol numbers)
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* @param prt Port or empty range for ANY (only applies to some protocols)
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*/
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Rule(const Range<unsigned int> &etype,const Range<unsigned int> &prot,const Range<unsigned int> &prt)
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throw() :
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_etherType(etype),
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_protocol(prot),
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_port(prt)
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{
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}
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inline const Range<unsigned int> ðerType() const throw() { return _etherType; }
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inline const Range<unsigned int> &protocol() const throw() { return _protocol; }
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inline const Range<unsigned int> &port() const throw() { return _port; }
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/**
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* Test this rule against a frame
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*
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* @param etype Type of ethernet frame
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* @param data Ethernet frame data
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* @param len Length of ethernet frame
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* @return True if rule matches
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* @throws std::invalid_argument Frame invalid or not parseable
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*/
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bool operator()(unsigned int etype,const void *data,unsigned int len) const
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throw(std::invalid_argument);
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/**
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* Serialize rule as string
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*
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* @return Human readable representation of rule
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*/
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std::string toString() const;
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inline bool operator==(const Rule &r) const throw() { return ((_etherType == r._etherType)&&(_protocol == r._protocol)&&(_port == r._port)); }
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inline bool operator!=(const Rule &r) const throw() { return !(*this == r); }
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inline bool operator<(const Rule &r) const
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throw()
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{
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if (_etherType < r._etherType)
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return true;
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else if (_etherType == r._etherType) {
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if (_protocol < r._protocol)
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return true;
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else if (_protocol == r._protocol) {
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if (_port < r._port)
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return true;
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}
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}
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return false;
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}
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inline bool operator>(const Rule &r) const throw() { return (r < *this); }
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inline bool operator<=(const Rule &r) const throw() { return !(r < *this); }
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inline bool operator>=(const Rule &r) const throw() { return !(*this < r); }
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private:
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Range<unsigned int> _etherType;
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Range<unsigned int> _protocol;
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Range<unsigned int> _port;
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};
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Filter() {}
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/**
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* @param s String-serialized filter representation
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*/
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Filter(const char *s)
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throw(std::invalid_argument);
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/**
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* @return Comma-delimited list of string-format rules
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*/
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std::string toString() const;
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/**
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* Add a rule to this filter
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*
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* @param r Rule to add to filter
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*/
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void add(const Rule &r);
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inline bool operator()(unsigned int etype,const void *data,unsigned int len) const
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throw(std::invalid_argument)
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{
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for(std::vector<Rule>::const_iterator r(_rules.begin());r!=_rules.end();++r) {
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if ((*r)(etype,data,len))
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return true;
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}
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return false;
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}
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static const char *etherTypeName(const unsigned int etherType)
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throw();
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static const char *ipProtocolName(const unsigned int ipp)
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throw();
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static const char *icmpTypeName(const unsigned int icmpType)
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throw();
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static const char *icmp6TypeName(const unsigned int icmp6Type)
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throw();
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private:
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std::vector<Rule> _rules;
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};
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} // namespace ZeroTier
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#endif
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