diff options
Diffstat (limited to 'node/InetAddress.hpp')
| -rw-r--r-- | node/InetAddress.hpp | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/node/InetAddress.hpp b/node/InetAddress.hpp index 6f070fbf..1dff710d 100644 --- a/node/InetAddress.hpp +++ b/node/InetAddress.hpp @@ -450,6 +450,30 @@ struct InetAddress : public sockaddr_storage 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 */ inline operator bool() const throw() { return (ss_family != 0); } |