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/* Copyright (C) 2007-2021 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.
*/
/**
* \ingroup decode
*
* @{
*/
/**
* \file
*
* \author Victor Julien <victor@inliniac.net>
*
* Decode Ethernet
*/
#include "suricata-common.h"
#include "decode.h"
#include "decode-ethernet.h"
#include "decode-events.h"
#include "util-validate.h"
#include "util-unittest.h"
#include "util-debug.h"
int DecodeEthernet(ThreadVars *tv, DecodeThreadVars *dtv, Packet *p,
const uint8_t *pkt, uint32_t len)
{
DEBUG_VALIDATE_BUG_ON(pkt == NULL);
StatsIncr(tv, dtv->counter_eth);
if (unlikely(len < ETHERNET_HEADER_LEN)) {
ENGINE_SET_INVALID_EVENT(p, ETHERNET_PKT_TOO_SMALL);
return TM_ECODE_FAILED;
}
if (!PacketIncreaseCheckLayers(p)) {
return TM_ECODE_FAILED;
}
p->ethh = (EthernetHdr *)pkt;
SCLogDebug("p %p pkt %p ether type %04x", p, pkt, SCNtohs(p->ethh->eth_type));
DecodeNetworkLayer(tv, dtv, SCNtohs(p->ethh->eth_type), p,
pkt + ETHERNET_HEADER_LEN, len - ETHERNET_HEADER_LEN);
return TM_ECODE_OK;
}
#ifdef UNITTESTS
/** DecodeEthernettest01
* \brief Valid Ethernet packet
* \retval 0 Expected test value
*/
static int DecodeEthernetTest01 (void)
{
/* ICMP packet wrapped in PPPOE */
uint8_t raw_eth[] = {
0x00, 0x10, 0x94, 0x55, 0x00, 0x01, 0x00, 0x10,
0x94, 0x56, 0x00, 0x01, 0x88, 0x64, 0x11, 0x00,
0x00, 0x01, 0x00, 0x68, 0x00, 0x21, 0x45, 0xc0,
0x00, 0x64, 0x00, 0x1e, 0x00, 0x00, 0xff, 0x01,
0xa7, 0x78, 0x0a, 0x00, 0x00, 0x02, 0x0a, 0x00,
0x00, 0x01, 0x08, 0x00, 0x4a, 0x61, 0x00, 0x06,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0f,
0x3b, 0xd4, 0xab, 0xcd, 0xab, 0xcd, 0xab, 0xcd,
0xab, 0xcd, 0xab, 0xcd, 0xab, 0xcd, 0xab, 0xcd,
0xab, 0xcd, 0xab, 0xcd, 0xab, 0xcd, 0xab, 0xcd,
0xab, 0xcd, 0xab, 0xcd, 0xab, 0xcd, 0xab, 0xcd,
0xab, 0xcd, 0xab, 0xcd, 0xab, 0xcd, 0xab, 0xcd,
0xab, 0xcd, 0xab, 0xcd, 0xab, 0xcd, 0xab, 0xcd,
0xab, 0xcd, 0xab, 0xcd, 0xab, 0xcd, 0xab, 0xcd,
0xab, 0xcd, 0xab, 0xcd, 0xab, 0xcd, 0xab, 0xcd,
0xab, 0xcd };
Packet *p = PacketGetFromAlloc();
if (unlikely(p == NULL))
return 0;
ThreadVars tv;
DecodeThreadVars dtv;
memset(&dtv, 0, sizeof(DecodeThreadVars));
memset(&tv, 0, sizeof(ThreadVars));
DecodeEthernet(&tv, &dtv, p, raw_eth, sizeof(raw_eth));
SCFree(p);
return 1;
}
/**
* Test a DCE ethernet frame that is too small.
*/
static int DecodeEthernetTestDceTooSmall(void)
{
uint8_t raw_eth[] = {
0x00, 0x10, 0x94, 0x55, 0x00, 0x01, 0x00, 0x10,
0x94, 0x56, 0x00, 0x01, 0x89, 0x03,
};
Packet *p = PacketGetFromAlloc();
FAIL_IF_NULL(p);
ThreadVars tv;
DecodeThreadVars dtv;
memset(&dtv, 0, sizeof(DecodeThreadVars));
memset(&tv, 0, sizeof(ThreadVars));
DecodeEthernet(&tv, &dtv, p, raw_eth, sizeof(raw_eth));
FAIL_IF_NOT(ENGINE_ISSET_EVENT(p, DCE_PKT_TOO_SMALL));
SCFree(p);
PASS;
}
/**
* Test that a DCE ethernet frame, followed by data that is too small
* for an ethernet header.
*
* Redmine issue:
* https://redmine.openinfosecfoundation.org/issues/2887
*/
static int DecodeEthernetTestDceNextTooSmall(void)
{
uint8_t raw_eth[] = {
0x00, 0x10, 0x94, 0x55, 0x00, 0x01, 0x00, 0x10,
0x94, 0x56, 0x00, 0x01, 0x89, 0x03, //0x88, 0x64,
0x00, 0x00,
0x00, 0x10, 0x94, 0x55, 0x00, 0x01, 0x00, 0x10,
0x94, 0x56, 0x00, 0x01,
};
Packet *p = PacketGetFromAlloc();
FAIL_IF_NULL(p);
ThreadVars tv;
DecodeThreadVars dtv;
memset(&dtv, 0, sizeof(DecodeThreadVars));
memset(&tv, 0, sizeof(ThreadVars));
DecodeEthernet(&tv, &dtv, p, raw_eth, sizeof(raw_eth));
FAIL_IF_NOT(ENGINE_ISSET_EVENT(p, DCE_PKT_TOO_SMALL));
SCFree(p);
PASS;
}
#endif /* UNITTESTS */
/**
* \brief Registers Ethernet unit tests
* \todo More Ethernet tests
*/
void DecodeEthernetRegisterTests(void)
{
#ifdef UNITTESTS
UtRegisterTest("DecodeEthernetTest01", DecodeEthernetTest01);
UtRegisterTest("DecodeEthernetTestDceNextTooSmall",
DecodeEthernetTestDceNextTooSmall);
UtRegisterTest("DecodeEthernetTestDceTooSmall",
DecodeEthernetTestDceTooSmall);
#endif /* UNITTESTS */
}
/**
* @}
*/
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