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Rate gate expensive validation of new identities in HELLO.

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This commit is contained in:
Adam Ierymenko 2016-11-18 12:59:04 -08:00
parent ab4021dd0e
commit 2ea9f516e1
6 changed files with 87 additions and 1 deletions
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24
node/InetAddress.hpp
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@ -449,6 +449,30 @@ struct InetAddress : public sockaddr_storage
bool isNetwork() const
throw();
/**
* @return 14-bit (0-16383) hash of this IP's first 24 or 48 bits (for V4 or V6) for rate limiting code, or 0 if non-IP
*/
inline unsigned long rateGateHash() const
{
unsigned long h = 0;
switch(ss_family) {
case AF_INET:
h = (Utils::ntoh((uint32_t)reinterpret_cast<const struct sockaddr_in *>(this)->sin_addr.s_addr) & 0xffffff00) >> 8;
h ^= (h >> 14);
break;
case AF_INET6: {
const uint8_t *ip = reinterpret_cast<const uint8_t *>(reinterpret_cast<const struct sockaddr_in6 *>(this)->sin6_addr.s6_addr);
h = ((unsigned long)ip[0]); h <<= 1;
h += ((unsigned long)ip[1]); h <<= 1;
h += ((unsigned long)ip[2]); h <<= 1;
h += ((unsigned long)ip[3]); h <<= 1;
h += ((unsigned long)ip[4]); h <<= 1;
h += ((unsigned long)ip[5]);
} break;
}
return (h & 0x3fff);
}
/**
* @return True if address family is non-zero
*/