mirror of
https://github.com/ntop/ntopng.git
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62 lines
2 KiB
C++
62 lines
2 KiB
C++
/*
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*
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* (C) 2013-18 - ntop.org
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*
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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*/
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#include "ntop_includes.h"
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/* ************************************ */
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FlowHash::FlowHash(NetworkInterface *_iface, u_int _num_hashes, u_int _max_hash_size)
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: GenericHash(_iface, _num_hashes, _max_hash_size, "FlowHash") {
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;
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};
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/* ************************************ */
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static u_int16_t max_num_loops = 0;
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Flow* FlowHash::find(IpAddress *src_ip, IpAddress *dst_ip,
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u_int16_t src_port, u_int16_t dst_port,
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u_int16_t vlanId, u_int8_t protocol,
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bool *src2dst_direction) {
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u_int32_t hash = ((src_ip->key()+dst_ip->key()+src_port+dst_port+vlanId+protocol) % num_hashes);
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Flow *head = (Flow*)table[hash];
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u_int16_t num_loops = 0;
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while(head) {
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if((!head->idle() && !head->is_ready_to_be_purged())
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&& head->equal(src_ip, dst_ip, src_port, dst_port, vlanId, protocol, src2dst_direction)) {
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if(num_loops > max_num_loops) {
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ntop->getTrace()->traceEvent(TRACE_INFO, "DEBUG: [Num loops: %u][hashId: %u]", num_loops, hash);
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max_num_loops = num_loops;
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}
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return(head);
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} else
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head = (Flow*)head->next(), num_loops++;
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}
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if(num_loops > max_num_loops) {
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ntop->getTrace()->traceEvent(TRACE_INFO, "DEBUG: [Num loops: %u][hashId: %u]", num_loops, hash);
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max_num_loops = num_loops;
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}
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return(NULL);
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}
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