GitHub Issue #69 - make MAC assignment schema differ between virtual networks.
This commit is contained in:
Adam Ierymenko
parent
05f5755bb1
commit
beb7b5bbe5
9 changed files with 278 additions and 217 deletions
238
node/MAC.hpp
238
node/MAC.hpp
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@ -30,114 +30,136 @@
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include "Constants.hpp"
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#include "Array.hpp"
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#include "Utils.hpp"
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#include "Address.hpp"
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#include "Buffer.hpp"
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namespace ZeroTier {
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/**
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* An Ethernet MAC address
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* 48-byte Ethernet MAC address
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*/
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class MAC : public Array<unsigned char,6>
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class MAC
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{
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public:
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/**
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* Create a zero/null MAC
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*/
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MAC()
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throw()
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{
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for(unsigned int i=0;i<6;++i)
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data[i] = 0;
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}
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MAC() throw() : _m(0ULL) {}
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MAC(const MAC &m) throw() : _m(m._m) {}
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/**
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* Create a MAC consisting of only this octet
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*
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* @param octet Octet to fill MAC with (e.g. 0xff for broadcast-all)
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* @param octet Single octet to fill entire MAC with (e.g. 0xff for broadcast)
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*/
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MAC(const unsigned char octet)
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throw()
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{
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for(unsigned int i=0;i<6;++i)
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data[i] = octet;
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}
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MAC(const unsigned char octet) throw() :
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_m( ((((uint64_t)octet) & 0xffULL) << 40) |
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((((uint64_t)octet) & 0xffULL) << 32) |
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((((uint64_t)octet) & 0xffULL) << 24) |
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((((uint64_t)octet) & 0xffULL) << 16) |
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((((uint64_t)octet) & 0xffULL) << 8) |
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(((uint64_t)octet) & 0xffULL) ) {}
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MAC(const unsigned char a,const unsigned char b,const unsigned char c,const unsigned char d,const unsigned char e,const unsigned char f) throw() :
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_m( ((((uint64_t)a) & 0xffULL) << 40) |
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((((uint64_t)b) & 0xffULL) << 32) |
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((((uint64_t)c) & 0xffULL) << 24) |
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((((uint64_t)d) & 0xffULL) << 16) |
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((((uint64_t)e) & 0xffULL) << 8) |
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(((uint64_t)f) & 0xffULL) ) {}
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MAC(const void *bits,unsigned int len) throw() { setTo(bits,len); }
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MAC(const Address &ztaddr,uint64_t nwid) throw() { fromAddress(ztaddr,nwid); }
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/**
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* Create a MAC from raw bits
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*
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* @param bits 6 bytes of MAC address data
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* Set MAC to zero
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*/
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MAC(const void *bits)
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throw()
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{
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for(unsigned int i=0;i<6;++i)
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data[i] = ((const unsigned char *)bits)[i];
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}
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inline void zero() { _m = 0ULL; }
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/**
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* @return True if non-NULL (not all zero)
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* @return True if MAC is non-zero
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*/
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inline operator bool() const
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inline operator bool() const throw() { return (_m != 0ULL); }
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/**
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* @param bits Raw MAC in big-endian byte order
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* @param len Length, must be >= 6 or result is zero
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*/
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inline void setTo(const void *bits,unsigned int len)
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throw()
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{
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for(unsigned int i=0;i<6;++i) {
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if (data[i])
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return true;
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if (len < 6) {
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_m = 0ULL;
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return;
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}
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return false;
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const unsigned char *b = (const unsigned char *)bits;
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_m = ((((uint64_t)*b) & 0xff) << 40); ++b;
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_m |= ((((uint64_t)*b) & 0xff) << 32); ++b;
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_m |= ((((uint64_t)*b) & 0xff) << 24); ++b;
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_m |= ((((uint64_t)*b) & 0xff) << 16); ++b;
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_m |= ((((uint64_t)*b) & 0xff) << 8); ++b;
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_m |= (((uint64_t)*b) & 0xff);
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}
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/**
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* @return True if this is the broadcast-all MAC (0xff:0xff:...)
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* @param buf Destination buffer for MAC in big-endian byte order
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* @param len Length of buffer, must be >= 6 or nothing is copied
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*/
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inline bool isBroadcast() const
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inline void copyTo(void *buf,unsigned int len) const
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throw()
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{
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for(unsigned int i=0;i<6;++i) {
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if (data[i] != 0xff)
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return false;
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}
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return true;
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if (len < 6)
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return;
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unsigned char *b = (unsigned char *)buf;
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*(b++) = (unsigned char)((_m >> 40) & 0xff);
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*(b++) = (unsigned char)((_m >> 32) & 0xff);
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*(b++) = (unsigned char)((_m >> 24) & 0xff);
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*(b++) = (unsigned char)((_m >> 16) & 0xff);
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*(b++) = (unsigned char)((_m >> 8) & 0xff);
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*b = (unsigned char)(_m & 0xff);
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}
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/**
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* @return True if this is a multicast/broadcast address
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* Append to a buffer in big-endian byte order
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*
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* @param b Buffer to append to
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*/
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inline bool isMulticast() const
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throw()
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template<unsigned int C>
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inline void appendTo(Buffer<C> &b) const
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throw(std::out_of_range)
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{
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return ((data[0] & 1));
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unsigned char *p = (unsigned char *)b.appendField(6);
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*(p++) = (unsigned char)((_m >> 40) & 0xff);
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*(p++) = (unsigned char)((_m >> 32) & 0xff);
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*(p++) = (unsigned char)((_m >> 24) & 0xff);
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*(p++) = (unsigned char)((_m >> 16) & 0xff);
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*(p++) = (unsigned char)((_m >> 8) & 0xff);
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*p = (unsigned char)(_m & 0xff);
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}
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/**
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* @return True if this is a ZeroTier unicast MAC
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* @return True if this is broadcast (all 0xff)
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*/
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inline bool isZeroTier() const
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throw()
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{
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return (data[0] == ZT_MAC_FIRST_OCTET);
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}
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inline bool isBroadcast() const throw() { return (_m == 0xffffffffffffULL); }
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/**
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* Zero this MAC
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* @return True if this is a multicast MAC
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*/
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inline void zero()
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throw()
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{
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for(unsigned int i=0;i<6;++i)
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data[i] = 0;
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}
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inline bool isMulticast() const throw() { return ((_m & 0x010000000000ULL) != 0ULL); }
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/**
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* @param s String hex representation (with or without :'s)
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* @return True if string decoded into a full-length MAC
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* @param True if this is a locally-administered MAC
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*/
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inline bool isLocallyAdministered() const throw() { return ((_m & 0x020000000000ULL) != 0ULL); }
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/**
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* @param s Hex MAC, with or without : delimiters
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*/
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inline void fromString(const char *s)
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{
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Utils::unhex(s,data,6);
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char tmp[8];
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Utils::unhex(s,tmp,6);
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setTo(tmp,6);
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}
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/**
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@ -145,10 +167,94 @@ public:
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*/
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inline std::string toString() const
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{
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char tmp[32];
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Utils::snprintf(tmp,sizeof(tmp),"%.2x:%.2x:%.2x:%.2x:%.2x:%.2x",(int)data[0],(int)data[1],(int)data[2],(int)data[3],(int)data[4],(int)data[5]);
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return std::string(tmp);
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char tmp[24];
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std::string s;
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Utils::snprintf(tmp,sizeof(tmp),"%.12llx",_m);
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for(int i=0;i<12;++i) {
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if ((i > 0)&&((i % 2) == 0))
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s.push_back(':');
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s.push_back(tmp[i]);
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}
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return s;
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}
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/**
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* Set this MAC to a MAC derived from an address and a network ID
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*
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* @param ztaddr ZeroTier address
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* @param nwid 64-bit network ID
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*/
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inline void fromAddress(const Address &ztaddr,uint64_t nwid)
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throw()
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{
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uint64_t m = ((uint64_t)firstOctetForNetwork(nwid)) << 40;
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uint64_t a = ztaddr.toInt();
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m |= a; // a is 40 bits
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m ^= ((nwid >> 8) & 0xff) << 32;
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m ^= ((nwid >> 16) & 0xff) << 24;
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m ^= ((nwid >> 24) & 0xff) << 16;
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m ^= ((nwid >> 32) & 0xff) << 8;
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m ^= (nwid >> 40) & 0xff;
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_m = m;
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}
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/**
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* Get the ZeroTier address for this MAC on this network (assuming no bridging of course, basic unicast)
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*
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* This just XORs the next-lest-significant 5 bytes of the network ID again to unmask.
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*
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* @param nwid Network ID
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*/
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inline Address toAddress(uint64_t nwid) const
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throw()
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{
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uint64_t a = _m & 0xffffffffffULL;
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a ^= ((nwid >> 8) & 0xff) << 32;
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a ^= ((nwid >> 16) & 0xff) << 24;
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a ^= ((nwid >> 24) & 0xff) << 16;
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a ^= ((nwid >> 32) & 0xff) << 8;
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a ^= (nwid >> 40) & 0xff;
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return Address(a);
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}
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/**
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* @param nwid Network ID
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* @return First octet of MAC for this network
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*/
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static inline unsigned char firstOctetForNetwork(uint64_t nwid)
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throw()
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{
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unsigned char a = ((unsigned char)(nwid & 0xfe) | 0x02); // locally administered, not multicast, from LSB of network ID
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return ((a == 0x52) ? 0x32 : a); // blacklist 0x52 since it's used by KVM
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}
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/**
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* @param i Value from 0 to 5 (inclusive)
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* @return Byte at said position (address interpreted in big-endian order)
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*/
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inline unsigned char operator[](unsigned int i) const throw() { return (unsigned char)((_m >> (40 - (i * 8))) & 0xff); }
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/**
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* @return 6, which is the number of bytes in a MAC, for container compliance
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*/
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inline unsigned int size() const throw() { return 6; }
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inline MAC &operator=(const MAC &m)
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throw()
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{
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_m = m._m;
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return *this;
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}
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inline bool operator==(const MAC &m) const throw() { return (_m == m._m); }
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inline bool operator!=(const MAC &m) const throw() { return (_m != m._m); }
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inline bool operator<(const MAC &m) const throw() { return (_m < m._m); }
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inline bool operator<=(const MAC &m) const throw() { return (_m <= m._m); }
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inline bool operator>(const MAC &m) const throw() { return (_m > m._m); }
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inline bool operator>=(const MAC &m) const throw() { return (_m >= m._m); }
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private:
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uint64_t _m;
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};
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} // namespace ZeroTier
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