mirror of
https://github.com/ntop/ntopng.git
synced 2026-05-08 06:24:34 +00:00
66 lines
2.3 KiB
C++
66 lines
2.3 KiB
C++
/*
|
|
*
|
|
* (C) 2013-19 - ntop.org
|
|
*
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 3 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software Foundation,
|
|
* Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
|
|
*
|
|
*/
|
|
|
|
#include "ntop_includes.h"
|
|
|
|
/* ************************************ */
|
|
|
|
FlowHash::FlowHash(NetworkInterface *_iface, u_int _num_hashes, u_int _max_hash_size)
|
|
: GenericHash(_iface, _num_hashes, _max_hash_size, "FlowHash") {
|
|
;
|
|
};
|
|
|
|
/* ************************************ */
|
|
|
|
static u_int16_t max_num_loops = 0;
|
|
|
|
Flow* FlowHash::find(IpAddress *src_ip, IpAddress *dst_ip,
|
|
u_int16_t src_port, u_int16_t dst_port,
|
|
u_int16_t vlanId, u_int8_t protocol,
|
|
const ICMPinfo * const icmp_info,
|
|
bool *src2dst_direction) {
|
|
u_int32_t hash = ((src_ip->key() + dst_ip->key()
|
|
+ (icmp_info ? icmp_info->key() : 0)
|
|
+ src_port + dst_port + vlanId + protocol) % num_hashes);
|
|
Flow *head = (Flow*)table[hash];
|
|
u_int16_t num_loops = 0;
|
|
|
|
// ntop->getTrace()->traceEvent(TRACE_NORMAL, "%u:%u / %u:%u [icmp: %u][key: %u][icmp info key: %u][head: 0x%x]", src_ip->key(), src_port, dst_ip->key(), dst_port, icmp_info ? 1 : 0, hash, icmp_info ? icmp_info->key() : 0, head);
|
|
|
|
while(head) {
|
|
if((!head->idle() && !head->is_ready_to_be_purged())
|
|
&& head->equal(src_ip, dst_ip, src_port, dst_port, vlanId, protocol, icmp_info, src2dst_direction)) {
|
|
if(num_loops > max_num_loops) {
|
|
ntop->getTrace()->traceEvent(TRACE_INFO, "DEBUG: [Num loops: %u][hashId: %u]", num_loops, hash);
|
|
max_num_loops = num_loops;
|
|
}
|
|
return(head);
|
|
} else
|
|
head = (Flow*)head->next(), num_loops++;
|
|
}
|
|
|
|
if(num_loops > max_num_loops) {
|
|
ntop->getTrace()->traceEvent(TRACE_INFO, "DEBUG: [Num loops: %u][hashId: %u]", num_loops, hash);
|
|
max_num_loops = num_loops;
|
|
}
|
|
|
|
return(NULL);
|
|
}
|