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util: add function for IP address hashing

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Move the hashing function from find_slot() in ntp_sources to make it
available to clientlog and improve the hashing a bit.
This commit is contained in:
Miroslav Lichvar
2015-11-23 15:24:33 +01:00
parent 59a3140621
commit 8b235297a5
3 changed files with 34 additions and 15 deletions
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20
ntp_sources.c
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@@ -202,26 +202,16 @@ find_slot(NTP_Remote_Address *remote_addr, int *slot, int *found)
uint32_t hash;
unsigned int i, size;
unsigned short port;
uint8_t *ip6;
size = ARR_GetSize(records);
switch (remote_addr->ip_addr.family) {
case IPADDR_INET6:
ip6 = remote_addr->ip_addr.addr.in6;
hash = (ip6[0] ^ ip6[4] ^ ip6[8] ^ ip6[12]) |
(ip6[1] ^ ip6[5] ^ ip6[9] ^ ip6[13]) << 8 |
(ip6[2] ^ ip6[6] ^ ip6[10] ^ ip6[14]) << 16 |
(ip6[3] ^ ip6[7] ^ ip6[11] ^ ip6[15]) << 24;
break;
case IPADDR_INET4:
hash = remote_addr->ip_addr.addr.in4;
break;
default:
*found = *slot = 0;
return;
if (remote_addr->ip_addr.family != IPADDR_INET4 &&
remote_addr->ip_addr.family != IPADDR_INET6) {
*found = *slot = 0;
return;
}
hash = UTI_IPToHash(&remote_addr->ip_addr);
port = remote_addr->port;
for (i = 0; i < size / 2; i++) {