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90 lines
2.5 KiB
C
90 lines
2.5 KiB
C
/* Copyright (C) 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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/**
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*
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* \author Giuseppe Longo <giuseppe@glongo.it>
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*
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*/
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#include "suricata-common.h"
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#include "decode.h"
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#include "decode-arp.h"
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#include "decode-events.h"
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int DecodeARP(ThreadVars *tv, DecodeThreadVars *dtv, Packet *p, const uint8_t *pkt, uint32_t len)
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{
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StatsIncr(tv, dtv->counter_arp);
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if (unlikely(len < ARP_HEADER_MIN_LEN)) {
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ENGINE_SET_INVALID_EVENT(p, ARP_PKT_TOO_SMALL);
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return TM_ECODE_FAILED;
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}
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if (!PacketIncreaseCheckLayers(p)) {
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return TM_ECODE_FAILED;
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}
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const ARPHdr *arph = PacketSetARP(p, pkt);
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if (unlikely(arph == NULL))
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return TM_ECODE_FAILED;
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if (SCNtohs(arph->hw_type) != ARP_HW_TYPE_ETHERNET) {
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ENGINE_SET_INVALID_EVENT(p, ARP_UNSUPPORTED_HARDWARE);
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PacketClearL3(p);
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return TM_ECODE_FAILED;
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}
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if (SCNtohs(arph->proto_type) != ETHERNET_TYPE_IP) {
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ENGINE_SET_INVALID_EVENT(p, ARP_UNSUPPORTED_PROTOCOL);
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PacketClearL3(p);
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return TM_ECODE_FAILED;
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}
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if (unlikely(len < ARP_HEADER_LEN)) {
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ENGINE_SET_INVALID_EVENT(p, ARP_INVALID_PKT);
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PacketClearL3(p);
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return TM_ECODE_FAILED;
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}
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if (arph->hw_size != ARP_HW_SIZE) {
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ENGINE_SET_INVALID_EVENT(p, ARP_INVALID_HARDWARE_SIZE);
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PacketClearL3(p);
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return TM_ECODE_FAILED;
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}
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if (arph->proto_size != ARP_PROTO_SIZE) {
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ENGINE_SET_INVALID_EVENT(p, ARP_INVALID_PROTOCOL_SIZE);
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PacketClearL3(p);
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return TM_ECODE_FAILED;
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}
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switch (SCNtohs(arph->opcode)) {
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case 1:
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case 2:
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case 3:
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case 4:
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break;
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default:
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ENGINE_SET_INVALID_EVENT(p, ARP_UNSUPPORTED_OPCODE);
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PacketClearL3(p);
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return TM_ECODE_FAILED;
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}
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return TM_ECODE_OK;
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}
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