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124 lines
4.7 KiB
C
124 lines
4.7 KiB
C
/*
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* Contains common Ethernet-related definition, not defined in NDIS
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*
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* Copyright (c) 2008-2017 Red Hat, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met :
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and / or other materials provided with the distribution.
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* 3. Neither the names of the copyright holders nor the names of their contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED.IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef _ETHERNET_UTILS_H
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#define _ETHERNET_UTILS_H
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// assuming <ndis.h> included
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#define ETH_IS_LOCALLY_ADMINISTERED(Address) \
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(BOOLEAN)(((PUCHAR)(Address))[0] & ((UCHAR)0x02))
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#define ETH_IS_EMPTY(Address) \
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((((PUCHAR)(Address))[0] == ((UCHAR)0x00)) && (((PUCHAR)(Address))[1] == ((UCHAR)0x00)) && (((PUCHAR)(Address))[2] == ((UCHAR)0x00)) && (((PUCHAR)(Address))[3] == ((UCHAR)0x00)) && (((PUCHAR)(Address))[4] == ((UCHAR)0x00)) && (((PUCHAR)(Address))[5] == ((UCHAR)0x00)))
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#define ETH_HAS_PRIO_HEADER(Address) \
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(((PUCHAR)(Address))[12] == ((UCHAR)0x81) && ((PUCHAR)(Address))[13] == ((UCHAR)0x00))
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#include <pshpack1.h>
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typedef struct _ETH_HEADER
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{
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UCHAR DstAddr[ETH_LENGTH_OF_ADDRESS];
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UCHAR SrcAddr[ETH_LENGTH_OF_ADDRESS];
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USHORT EthType;
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} ETH_HEADER, *PETH_HEADER;
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#include <poppack.h>
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#define ETH_HEADER_SIZE (sizeof(ETH_HEADER))
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#define ETH_MIN_PACKET_SIZE 60
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#define ETH_PRIORITY_HEADER_OFFSET 12
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#define ETH_PRIORITY_HEADER_SIZE 4
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static void FORCEINLINE SetPriorityData(UCHAR *pDest, ULONG priority, ULONG VlanID)
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{
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pDest[0] = 0x81;
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pDest[2] = (UCHAR)(priority << 5);
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pDest[2] |= (UCHAR)(VlanID >> 8);
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pDest[3] |= (UCHAR)VlanID;
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}
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typedef enum _tag_eInspectedPacketType
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{
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iptUnicast,
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iptBroadcast,
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iptMulticast,
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iptInvalid
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}eInspectedPacketType;
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// IP Header RFC 791
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typedef struct _tagIPv4Header {
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UCHAR ip_verlen; // length in 32-bit units(low nibble), version (high nibble)
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UCHAR ip_tos; // Type of service
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USHORT ip_length; // Total length
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USHORT ip_id; // Identification
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USHORT ip_offset; // fragment offset and flags
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UCHAR ip_ttl; // Time to live
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UCHAR ip_protocol; // Protocol
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USHORT ip_xsum; // Header checksum
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ULONG ip_src; // Source IP address
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ULONG ip_dest; // Destination IP address
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} IPv4Header;
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// TCP header RFC 793
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typedef struct _tagTCPHeader {
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USHORT tcp_src; // Source port
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USHORT tcp_dest; // Destination port
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ULONG tcp_seq; // Sequence number
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ULONG tcp_ack; // Ack number
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USHORT tcp_flags; // header length and flags
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USHORT tcp_window; // Window size
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USHORT tcp_xsum; // Checksum
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USHORT tcp_urgent; // Urgent
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}TCPHeader;
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// UDP Header RFC 768
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typedef struct _tagUDPHeader {
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USHORT udp_src; // Source port
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USHORT udp_dest; // Destination port
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USHORT udp_length; // length of datagram
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USHORT udp_xsum; // checksum
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}UDPHeader;
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#define TCP_CHECKSUM_OFFSET 16
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#define UDP_CHECKSUM_OFFSET 6
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#define MAX_IPV4_HEADER_SIZE 60
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#define MAX_TCP_HEADER_SIZE 60
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static __inline USHORT swap_short(USHORT us)
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{
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return (us << 8) | (us >> 8);
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}
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#endif
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