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117 lines
3.5 KiB
C
117 lines
3.5 KiB
C
/* Copyright (C) 2023-2024 Open Information Security Foundation
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*
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* You can copy, redistribute or modify this Program under the terms of
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* the GNU General Public License version 2 as published by the Free
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* Software Foundation.
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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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* version 2 along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA.
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*/
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/** \file
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*
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* \author Angelo Mirabella <angelo.mirabella@broadcom.com>
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*
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* LIB packet and stream decoding support
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*
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*/
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#include "suricata-common.h"
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#include "source-lib.h"
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#include "util-device-private.h"
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/* Set time to the first packet timestamp when replaying a PCAP. */
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static bool time_set = false;
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/** \brief initialize the "Decode" module.
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*
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* \param tv Pointer to the per-thread structure.
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* \param initdata Pointer to initialization context.
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* \param data Pointer to the initialized context.
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* \return Error code.
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*/
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static TmEcode DecodeLibThreadInit(ThreadVars *tv, const void *initdata, void **data)
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{
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SCEnter();
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DecodeThreadVars *dtv = NULL;
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dtv = DecodeThreadVarsAlloc(tv);
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if (dtv == NULL)
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SCReturnInt(TM_ECODE_FAILED);
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DecodeRegisterPerfCounters(dtv, tv);
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*data = (void *)dtv;
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SCReturnInt(TM_ECODE_OK);
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}
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/** \brief deinitialize the "Decode" module.
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*
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* \param tv Pointer to the per-thread structure.
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* \param data Pointer to the context.
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* \return Error code.
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*/
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static TmEcode DecodeLibThreadDeinit(ThreadVars *tv, void *data)
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{
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if (data != NULL)
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DecodeThreadVarsFree(tv, data);
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time_set = false;
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SCReturnInt(TM_ECODE_OK);
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}
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/** \brief main decoding function.
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*
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* This method receives a packet and tries to identify layer 2 to 4 layers.
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*
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* \param tv Pointer to the per-thread structure.
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* \param p Pointer to the packet.
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* \param data Pointer to the context.
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* \return Error code.
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*/
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static TmEcode DecodeLib(ThreadVars *tv, Packet *p, void *data)
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{
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SCEnter();
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DecodeThreadVars *dtv = (DecodeThreadVars *)data;
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BUG_ON(PKT_IS_PSEUDOPKT(p));
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/* update counters */
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DecodeUpdatePacketCounters(tv, dtv, p);
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/* If suri has set vlan during reading, we increase vlan counter */
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if (p->vlan_idx) {
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StatsIncr(tv, dtv->counter_vlan);
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}
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/* call the decoder */
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DecodeLinkLayer(tv, dtv, p->datalink, p, GET_PKT_DATA(p), GET_PKT_LEN(p));
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PacketDecodeFinalize(tv, dtv, p);
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SCReturnInt(TM_ECODE_OK);
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}
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/** \brief register a "Decode" module for suricata as a library.
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*
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* The "Decode" module is the first module invoked when processing a packet */
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void TmModuleDecodeLibRegister(void)
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{
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tmm_modules[TMM_DECODELIB].name = "DecodeLib";
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tmm_modules[TMM_DECODELIB].ThreadInit = DecodeLibThreadInit;
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tmm_modules[TMM_DECODELIB].Func = DecodeLib;
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tmm_modules[TMM_DECODELIB].ThreadExitPrintStats = NULL;
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tmm_modules[TMM_DECODELIB].ThreadDeinit = DecodeLibThreadDeinit;
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tmm_modules[TMM_DECODELIB].cap_flags = 0;
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tmm_modules[TMM_DECODELIB].flags = TM_FLAG_DECODE_TM;
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}
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