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104 lines
2.8 KiB
C
104 lines
2.8 KiB
C
/* Copyright (C) 2015-2021 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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* \ingroup decode
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*
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* @{
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*/
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/**
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* \file
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*
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* \author Victor Julien <victor@inliniac.net>
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*
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* Decode linktype null:
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* http://www.tcpdump.org/linktypes.html
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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-raw.h"
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#include "decode-events.h"
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#include "util-validate.h"
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#include "util-unittest.h"
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#include "util-debug.h"
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#define HDR_SIZE 4
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#define AF_INET6_BSD 24
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#define AF_INET6_FREEBSD 28
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#define AF_INET6_DARWIN 30
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#define AF_INET6_LINUX 10
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#define AF_INET6_SOLARIS 26
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#define AF_INET6_WINSOCK 23
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int DecodeNull(ThreadVars *tv, DecodeThreadVars *dtv, Packet *p,
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const uint8_t *pkt, uint32_t len)
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{
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DEBUG_VALIDATE_BUG_ON(pkt == NULL);
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StatsIncr(tv, dtv->counter_null);
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if (unlikely(len < HDR_SIZE)) {
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ENGINE_SET_INVALID_EVENT(p, LTNULL_PKT_TOO_SMALL);
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return TM_ECODE_FAILED;
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}
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if (unlikely(GET_PKT_LEN(p) > HDR_SIZE + USHRT_MAX)) {
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return TM_ECODE_FAILED;
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}
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#if __BYTE_ORDER__ == __BIG_ENDIAN
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uint32_t type = pkt[0] | pkt[1] << 8 | pkt[2] << 16 | pkt[3] << 24;
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#else
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uint32_t type = *((uint32_t *)pkt);
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#endif
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switch(type) {
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case AF_INET:
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SCLogDebug("IPV4 Packet");
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if (GET_PKT_LEN(p) - HDR_SIZE > USHRT_MAX) {
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return TM_ECODE_FAILED;
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}
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DecodeIPV4(
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tv, dtv, p, GET_PKT_DATA(p) + HDR_SIZE, (uint16_t)(GET_PKT_LEN(p) - HDR_SIZE));
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break;
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case AF_INET6_BSD:
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case AF_INET6_FREEBSD:
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case AF_INET6_DARWIN:
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case AF_INET6_LINUX:
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case AF_INET6_SOLARIS:
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case AF_INET6_WINSOCK:
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SCLogDebug("IPV6 Packet");
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if (GET_PKT_LEN(p) - HDR_SIZE > USHRT_MAX) {
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return TM_ECODE_FAILED;
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}
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DecodeIPV6(
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tv, dtv, p, GET_PKT_DATA(p) + HDR_SIZE, (uint16_t)(GET_PKT_LEN(p) - HDR_SIZE));
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break;
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default:
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SCLogDebug("Unknown Null packet type version %" PRIu32 "", type);
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ENGINE_SET_EVENT(p, LTNULL_UNSUPPORTED_TYPE);
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break;
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}
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return TM_ECODE_OK;
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}
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/**
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* @}
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*/
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