1 //--------------------------------------------------------------------------
2 // Copyright (C) 2014-2021 Cisco and/or its affiliates. All rights reserved.
3 //
4 // This program is free software; you can redistribute it and/or modify it
5 // under the terms of the GNU General Public License Version 2 as published
6 // by the Free Software Foundation.  You may not use, modify or distribute
7 // this program under any other version of the GNU General Public License.
8 //
9 // This program is distributed in the hope that it will be useful, but
10 // WITHOUT ANY WARRANTY; without even the implied warranty of
11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
12 // General Public License for more details.
13 //
14 // You should have received a copy of the GNU General Public License along
15 // with this program; if not, write to the Free Software Foundation, Inc.,
16 // 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
17 //--------------------------------------------------------------------------
18 // eth.h author Josh Rosenbaum <jrosenba@cisco.com>
19 
20 #ifndef PROTOCOLS_ETH_H
21 #define PROTOCOLS_ETH_H
22 
23 #include <arpa/inet.h>
24 #include "protocols/protocol_ids.h"
25 
26 #define ETHERNET_HEADER_LEN 14
27 #define ETHERNET_MTU        1500
28 
29 namespace snort
30 {
31 namespace eth
32 {
33 constexpr uint16_t MTU_LEN = 1500;
34 constexpr uint16_t MAX_FRAME_LENGTH = 1500;
35 constexpr uint16_t ETH_HEADER_LEN = 14;
36 
37 struct EtherHdr
38 {
39     uint8_t ether_dst[6];
40     uint8_t ether_src[6];
41     uint16_t ether_type;
42 
43     /* return data in byte order */
ethertypeEtherHdr44     inline ProtocolId ethertype() const
45     { return (ProtocolId)ntohs(ether_type); }
46 
47     /* return data in network order */
raw_ethertypeEtherHdr48     inline uint16_t raw_ethertype() const
49     { return ether_type; }
50 };
51 } // namespace eth
52 } // namespace snort
53 
54 #endif
55 
56