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/* Copyright (C) 2007-2022 Open Information Security Foundation
*
* You can copy, redistribute or modify this Program under the terms of
* the GNU General Public License version 2 as published by the Free
* Software Foundation.
*
* 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
* version 2 along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*/
/**
* \file
*
* \author Victor Julien <victor@inliniac.net>
*/
#include "suricata-common.h"
#include "suricata.h"
#include "stream-tcp-private.h"
#include "stream-tcp-cache.h"
#include "util-debug.h"
typedef struct TcpPoolCache {
bool cache_enabled; /**< cache should only be enabled for worker threads */
TcpSegment *segs_cache[64];
uint32_t segs_cache_idx;
uint32_t segs_returns_idx;
TcpSegment *segs_returns[64];
TcpSession *ssns_cache[64];
uint32_t ssns_cache_idx;
uint32_t ssns_returns_idx;
TcpSession *ssns_returns[64];
} TcpPoolCache;
static thread_local TcpPoolCache tcp_pool_cache;
extern PoolThread *ssn_pool;
extern PoolThread *segment_thread_pool;
/** \brief enable segment cache. Should only be done for worker threads */
void StreamTcpThreadCacheEnable(void)
{
tcp_pool_cache.cache_enabled = true;
}
void StreamTcpThreadCacheReturnSegment(TcpSegment *seg)
{
SCEnter();
#ifdef UNITTESTS
if (RunmodeIsUnittests()) {
PoolThreadReturn(segment_thread_pool, seg);
SCReturn;
}
#endif
/* cache can have segs from any pool id */
if (tcp_pool_cache.cache_enabled && tcp_pool_cache.segs_cache_idx < 64) {
tcp_pool_cache.segs_cache[tcp_pool_cache.segs_cache_idx++] = seg;
} else {
/* segs_returns should only have a single pool id. If ours is different,
* flush it. */
bool flush = false;
if (tcp_pool_cache.segs_returns_idx &&
tcp_pool_cache.segs_returns[0]->pool_id != seg->pool_id) {
flush = true;
}
if (tcp_pool_cache.segs_returns_idx == 64) {
flush = true;
}
if (flush) {
PoolThreadId pool_id = tcp_pool_cache.segs_returns[0]->pool_id;
PoolThreadLock(segment_thread_pool, pool_id);
for (uint32_t i = 0; i < tcp_pool_cache.segs_returns_idx; i++) {
TcpSegment *ret_seg = tcp_pool_cache.segs_returns[i];
PoolThreadReturnRaw(segment_thread_pool, pool_id, ret_seg);
}
PoolThreadUnlock(segment_thread_pool, pool_id);
tcp_pool_cache.segs_returns_idx = 0;
}
tcp_pool_cache.segs_returns[tcp_pool_cache.segs_returns_idx++] = seg;
}
}
void StreamTcpThreadCacheReturnSession(TcpSession *ssn)
{
SCEnter();
#ifdef UNITTESTS
if (RunmodeIsUnittests()) {
PoolThreadReturn(ssn_pool, ssn);
SCReturn;
}
#endif
/* cache can have ssns from any pool id */
if (tcp_pool_cache.cache_enabled && tcp_pool_cache.ssns_cache_idx < 64) {
tcp_pool_cache.ssns_cache[tcp_pool_cache.ssns_cache_idx++] = ssn;
} else {
/* ssns_returns should only have a single pool id. If ours is different,
* flush it. */
bool flush = false;
if (tcp_pool_cache.ssns_returns_idx &&
tcp_pool_cache.ssns_returns[0]->pool_id != ssn->pool_id) {
flush = true;
}
if (tcp_pool_cache.ssns_returns_idx == 64) {
flush = true;
}
if (flush) {
PoolThreadId pool_id = tcp_pool_cache.ssns_returns[0]->pool_id;
PoolThreadLock(ssn_pool, pool_id);
for (uint32_t i = 0; i < tcp_pool_cache.ssns_returns_idx; i++) {
TcpSession *ret_ssn = tcp_pool_cache.ssns_returns[i];
PoolThreadReturnRaw(ssn_pool, pool_id, ret_ssn);
}
PoolThreadUnlock(ssn_pool, pool_id);
tcp_pool_cache.ssns_returns_idx = 0;
}
tcp_pool_cache.ssns_returns[tcp_pool_cache.ssns_returns_idx++] = ssn;
}
SCReturn;
}
void StreamTcpThreadCacheCleanup(void)
{
SCEnter();
/* segments */
SCLogDebug("tcp_pool_cache.segs_cache_idx %u", tcp_pool_cache.segs_cache_idx);
for (uint32_t i = 0; i < tcp_pool_cache.segs_cache_idx; i++) {
PoolThreadReturn(segment_thread_pool, tcp_pool_cache.segs_cache[i]);
}
tcp_pool_cache.segs_cache_idx = 0;
SCLogDebug("tcp_pool_cache.segs_returns_idx %u", tcp_pool_cache.segs_returns_idx);
if (tcp_pool_cache.segs_returns_idx) {
PoolThreadId pool_id = tcp_pool_cache.segs_returns[0]->pool_id;
PoolThreadLock(segment_thread_pool, pool_id);
for (uint32_t i = 0; i < tcp_pool_cache.segs_returns_idx; i++) {
TcpSegment *ret_seg = tcp_pool_cache.segs_returns[i];
PoolThreadReturnRaw(segment_thread_pool, pool_id, ret_seg);
}
PoolThreadUnlock(segment_thread_pool, pool_id);
tcp_pool_cache.segs_returns_idx = 0;
}
/* sessions */
SCLogDebug("tcp_pool_cache.ssns_cache_idx %u", tcp_pool_cache.ssns_cache_idx);
for (uint32_t i = 0; i < tcp_pool_cache.ssns_cache_idx; i++) {
PoolThreadReturn(ssn_pool, tcp_pool_cache.ssns_cache[i]);
}
tcp_pool_cache.ssns_cache_idx = 0;
SCLogDebug("tcp_pool_cache.ssns_returns_idx %u", tcp_pool_cache.ssns_returns_idx);
if (tcp_pool_cache.ssns_returns_idx) {
PoolThreadId pool_id = tcp_pool_cache.ssns_returns[0]->pool_id;
PoolThreadLock(ssn_pool, pool_id);
for (uint32_t i = 0; i < tcp_pool_cache.ssns_returns_idx; i++) {
TcpSession *ret_ssn = tcp_pool_cache.ssns_returns[i];
PoolThreadReturnRaw(ssn_pool, pool_id, ret_ssn);
}
PoolThreadUnlock(ssn_pool, pool_id);
tcp_pool_cache.ssns_returns_idx = 0;
}
SCReturn;
}
TcpSegment *StreamTcpThreadCacheGetSegment(void)
{
if (tcp_pool_cache.segs_cache_idx) {
TcpSegment *seg = tcp_pool_cache.segs_cache[tcp_pool_cache.segs_cache_idx - 1];
tcp_pool_cache.segs_cache_idx--;
memset(&seg->sbseg, 0, sizeof(seg->sbseg));
return seg;
}
return NULL;
}
TcpSession *StreamTcpThreadCacheGetSession(void)
{
if (tcp_pool_cache.ssns_cache_idx) {
TcpSession *ssn = tcp_pool_cache.ssns_cache[tcp_pool_cache.ssns_cache_idx - 1];
tcp_pool_cache.ssns_cache_idx--;
return ssn;
}
return NULL;
}
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