mirror of
https://github.com/ntop/ntopng.git
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116 lines
3.7 KiB
C++
116 lines
3.7 KiB
C++
/*
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*
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* (C) 2013-25 - 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,
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u_int _max_hash_size)
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: GenericHash(_iface, _num_hashes, _max_hash_size, "FlowHash") {
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if(trace_new_delete) ntop->getTrace()->traceEvent(TRACE_NORMAL, "[new] %s", __FILE__);
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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(Mac *src_mac, Mac *dst_mac, IpAddress *src_ip,
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IpAddress *dst_ip, u_int16_t src_port, u_int16_t dst_port,
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u_int16_t vlanId, u_int16_t observation_point_id,
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u_int32_t private_flow_id, u_int8_t protocol,
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const ICMPinfo *const icmp_info, bool *src2dst_direction,
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bool is_inline_call, Flow **unswapped_flow) {
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u_int32_t hash = ((src_ip->key() + dst_ip->key() + (icmp_info ? icmp_info->key() : 0) +
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private_flow_id + src_port + dst_port + vlanId + protocol) %
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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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*unswapped_flow = NULL;
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#if 0
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ntop->getTrace()->traceEvent(TRACE_NORMAL, "%u:%u / %u:%u [icmp: %u][key: %u][icmp info key: %u][head: 0x%x]",
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src_ip->key(), src_port, dst_ip->key(), dst_port, icmp_info ? 1 : 0, hash, icmp_info ? icmp_info->key() : 0, head);
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#endif
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if (!head) return (NULL);
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if (!is_inline_call) locks[hash]->rdlock(__FILE__, __LINE__);
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while (head) {
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if (!head->idle() &&
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head->equal(src_mac, dst_mac, src_ip, dst_ip, src_port, dst_port,
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vlanId, observation_point_id, private_flow_id, protocol,
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icmp_info, src2dst_direction)) {
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if (num_loops > max_num_loops) {
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ntop->getTrace()->traceEvent(
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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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if (head->is_swap_requested()) {
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/*
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This is a good flow but in the wrong direction
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hence we remember the flow unswapped but merge
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data with the flow with the correct direction
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*/
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*unswapped_flow = head;
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head = NULL;
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}
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break;
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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(
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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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if (!is_inline_call) locks[hash]->unlock(__FILE__, __LINE__);
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return (head);
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}
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/* ************************************ */
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Flow *FlowHash::findByKeyAndHashId(u_int32_t key, u_int32_t hash_id) {
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u_int32_t hash = key % num_hashes;
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Flow *head = (Flow *)table[hash];
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if (head == NULL) return (NULL);
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locks[hash]->rdlock(__FILE__, __LINE__);
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while (head) {
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if ((!head->idle()) && (head->get_hash_entry_id() == hash_id))
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break;
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else
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head = (Flow *)head->next();
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}
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locks[hash]->unlock(__FILE__, __LINE__);
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return ((Flow *)head);
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}
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