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nhtflowcache.h
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nhtflowcache.h
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/**
* \file nhtflowcache.h
* \brief "NewHashTable" flow cache
* \author Martin Zadnik <[email protected]>
* \author Vaclav Bartos <[email protected]>
* \author Jiri Havranek <[email protected]>
* \date 2014
* \date 2015
* \date 2016
*/
/*
* Copyright (C) 2014-2016 CESNET
*
* LICENSE TERMS
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name of the Company nor the names of its contributors
* may be used to endorse or promote products derived from this
* software without specific prior written permission.
*
* ALTERNATIVELY, provided that this notice is retained in full, this
* product may be distributed under the terms of the GNU General Public
* License (GPL) version 2 or later, in which case the provisions
* of the GPL apply INSTEAD OF those given above.
*
* This software is provided ``as is'', and any express or implied
* warranties, including, but not limited to, the implied warranties of
* merchantability and fitness for a particular purpose are disclaimed.
* In no event shall the company or contributors be liable for any
* direct, indirect, incidental, special, exemplary, or consequential
* damages (including, but not limited to, procurement of substitute
* goods or services; loss of use, data, or profits; or business
* interruption) however caused and on any theory of liability, whether
* in contract, strict liability, or tort (including negligence or
* otherwise) arising in any way out of the use of this software, even
* if advised of the possibility of such damage.
*
*/
#ifndef NHTFLOWCACHE_H
#define NHTFLOWCACHE_H
#include <string>
#include "ipfixprobe.h"
#include "flowcache.h"
#include "flowifc.h"
#include "flowexporter.h"
using namespace std;
#define MAX_KEY_LENGTH 38
#define INACTIVE_CHECK_PERIOD_1 5 // Inactive timeout of flows will be checked every X seconds when packets are continuously arriving
#define INACTIVE_CHECK_PERIOD_2 1 // Inactive timeout of flows will be checked every X seconds when packet read timeout occured or read is nonblocking
class FlowRecord
{
uint64_t hash;
public:
Flow flow;
void erase()
{
flow.removeExtensions();
hash = 0;
memset(&flow.time_first, 0, sizeof(flow.time_first));
memset(&flow.time_last, 0, sizeof(flow.time_last));
flow.ip_version = 0;
flow.ip_proto = 0;
memset(&flow.src_ip, 0, sizeof(flow.src_ip));
memset(&flow.dst_ip, 0, sizeof(flow.dst_ip));
flow.src_port = 0;
flow.dst_port = 0;
flow.src_pkt_total_cnt = 0;
flow.dst_pkt_total_cnt = 0;
flow.src_octet_total_length = 0;
flow.dst_octet_total_length = 0;
flow.src_tcp_control_bits = 0;
flow.dst_tcp_control_bits = 0;
}
void soft_clean()
{
flow.removeExtensions();
flow.time_first = flow.time_last;
flow.src_pkt_total_cnt = 0;
flow.dst_pkt_total_cnt = 0;
flow.src_octet_total_length = 0;
flow.dst_octet_total_length = 0;
flow.src_tcp_control_bits = 0;
flow.dst_tcp_control_bits = 0;
}
FlowRecord()
{
erase();
};
~FlowRecord()
{
};
inline bool is_empty() const;
inline bool belongs(uint64_t pkt_hash) const;
void create(const Packet &pkt, uint64_t pkt_hash);
void update(const Packet &pkt, bool src);
};
class NHTFlowCache : public FlowCache
{
bool print_stats;
uint8_t key_len;
uint32_t size;
uint32_t line_size;
uint32_t line_size_mask;
uint32_t line_new_index;
uint32_t q_size;
uint32_t q_index;
uint32_t timeout_idx;
#ifdef FLOW_CACHE_STATS
uint64_t empty;
uint64_t not_empty;
uint64_t hits;
uint64_t expired;
uint64_t flushed;
uint64_t lookups;
uint64_t lookups2;
#endif /* FLOW_CACHE_STATS */
struct timeval active;
struct timeval inactive;
char key[MAX_KEY_LENGTH];
char key_inv[MAX_KEY_LENGTH];
FlowRecord **flow_array;
FlowRecord *flow_records;
public:
NHTFlowCache(const options_t &options)
{
size = options.flow_cache_size;
q_size = options.flow_cache_qsize;
q_index = 0;
timeout_idx = 0;
line_size = options.flow_line_size;
/* Mask for getting flow cache line index. */
line_size_mask = (size - 1) & ~(line_size - 1);
line_new_index = line_size / 2;
#ifdef FLOW_CACHE_STATS
empty = 0;
not_empty = 0;
hits = 0;
expired = 0;
flushed = 0;
lookups = 0;
lookups2 = 0;
#endif /* FLOW_CACHE_STATS */
print_stats = options.print_stats;
active = options.active_timeout;
inactive = options.inactive_timeout;
flow_array = new FlowRecord*[size + q_size];
flow_records = new FlowRecord[size + q_size];
for (unsigned int i = 0; i < size + q_size; i++) {
flow_array[i] = flow_records + i;
}
};
~NHTFlowCache()
{
delete [] flow_records;
delete [] flow_array;
};
// Put packet into the cache (i.e. update corresponding flow record or create a new one)
virtual int put_pkt(Packet &pkt);
virtual void init();
virtual void finish();
void export_expired(time_t ts);
void flush(Packet &pkt, size_t flow_index, int ret, bool source_flow);
protected:
bool create_hash_key(Packet &pkt);
void export_flow(size_t index);
void print_report();
};
struct __attribute__((packed)) flow_key_v4_t {
uint16_t src_port;
uint16_t dst_port;
uint8_t proto;
uint8_t ip_version;
uint32_t src_ip;
uint32_t dst_ip;
};
struct __attribute__((packed)) flow_key_v6_t {
uint16_t src_port;
uint16_t dst_port;
uint8_t proto;
uint8_t ip_version;
uint8_t src_ip[16];
uint8_t dst_ip[16];
};
#endif