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More filter work, and doc updates

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This commit is contained in:
Adam Ierymenko
2013-07-08 00:21:43 -04:00
parent e2a2d33f8f
commit f8cfdf973e
3 changed files with 110 additions and 31 deletions
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49
node/Filter.cpp
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@ -30,27 +30,50 @@
#include "RuntimeEnvironment.hpp"
#include "Logger.hpp"
#include "Filter.hpp"
#include "Utils.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
if ((!_etherType)||(_etherType(etype))) { // ethertype is ANY, or matches
// Ethertype determines meaning of protocol and port
switch(etype) {
case ZT_ETHERTYPE_IPV4:
if (len > 20) {
if ((!_protocol)||(_protocol(((const uint8_t *)data)[9]))) { // IP protocol
if (!_port)
return true; // protocol matches, port is ANY
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
// Don't match on fragments beyond fragment 0. If we've blocked
// fragment 0, further fragments will fall on deaf ears anyway.
if ((Utils::ntoh(((const uint16_t *)data)[3]) & 0x1fff))
return false;
switch(((const uint8_t *)data)[9]) {
}
// Internet header length determines where data begins, in multiples of 32 bits
unsigned int ihl = 4 * (((const uint8_t *)data)[0] & 0x0f);
break;
case ZT_ETHERTYPE_IPV6
break;
switch(((const uint8_t *)data)[9]) { // port's meaning depends on IP protocol
case ZT_IPPROTO_ICMP:
return _port(((const uint8_t *)data)[ihl]); // port = ICMP type
case ZT_IPPROTO_TCP:
case ZT_IPPROTO_UDP:
case ZT_IPPROTO_SCTP:
case ZT_IPPROTO_UDPLITE:
return _port(((const uint16_t *)data)[(ihl / 2) + 1]); // destination port
}
return false; // no match on port
}
}
break;
case ZT_ETHERTYPE_IPV6:
if (len > 40) {
// see: http://stackoverflow.com/questions/17518951/is-the-ipv6-header-really-this-nutty
}
break;
}
}
return false;