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/*
* Copyright (c) 2014 VMware, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef __PACKET_PARSER_H_
#define __PACKET_PARSER_H_ 1
#define MIN_IPV4_HLEN 20
#include "precomp.h"
#include "NetProto.h"
const VOID* OvsGetPacketBytes(const NET_BUFFER_LIST *_pNB, UINT32 len,
UINT32 SrcOffset, VOID *storage);
NDIS_STATUS OvsParseIPv6(const NET_BUFFER_LIST *packet, Ipv6Key *key,
POVS_PACKET_HDR_INFO layers);
VOID OvsParseTcp(const NET_BUFFER_LIST *packet, L4Key *flow,
POVS_PACKET_HDR_INFO layers);
VOID OvsParseUdp(const NET_BUFFER_LIST *packet, L4Key *flow,
POVS_PACKET_HDR_INFO layers);
VOID OvsParseSctp(const NET_BUFFER_LIST *packet, L4Key *flow,
POVS_PACKET_HDR_INFO layers);
NDIS_STATUS OvsParseIcmpV6(const NET_BUFFER_LIST *packet,
Ipv6Key *ipv6Key,
Icmp6Key *flow,
POVS_PACKET_HDR_INFO layers);
static __inline ULONG
OvsPacketLenNBL(const NET_BUFFER_LIST *_pNB)
{
INT length = 0;
NET_BUFFER *nb;
nb = NET_BUFFER_LIST_FIRST_NB(_pNB);
ASSERT(nb);
while(nb) {
length += NET_BUFFER_DATA_LENGTH(nb);
nb = NET_BUFFER_NEXT_NB(nb);
}
return length;
}
/*
* Returns the ctl field from the TCP header in 'packet', or 0 if the field
* can't be read. The caller must have ensured that 'packet' contains a TCP
* header.
*
* We can't just use TCPHdr, from netProto.h, for this because that
* breaks the flags down into individual bit-fields. We can't even use
* offsetof because that will try to take the address of a bit-field,
* which C does not allow.
*/
static UINT16
OvsGetTcpCtl(const NET_BUFFER_LIST *packet, // IN
const POVS_PACKET_HDR_INFO layers) // IN
{
#define TCP_CTL_OFS 12 // Offset of "ctl" field in TCP header.
#define TCP_FLAGS(CTL) ((CTL) & 0x3f) // Obtain TCP flags from CTL.
const UINT16 *ctl;
UINT16 storage;
ctl = OvsGetPacketBytes(packet, sizeof *ctl, layers->l4Offset + TCP_CTL_OFS,
&storage);
return ctl ? *ctl : 0;
}
static UINT8
OvsGetTcpFlags(const NET_BUFFER_LIST *packet, // IN
const OvsFlowKey *key, // IN
const POVS_PACKET_HDR_INFO layers) // IN
{
UNREFERENCED_PARAMETER(key); // should be removed later
if (layers->isTcp) {
return TCP_FLAGS(OvsGetTcpCtl(packet, layers));
} else {
return 0;
}
}
static const EtherArp *
OvsGetArp(const NET_BUFFER_LIST *packet,
UINT32 ofs,
EtherArp *storage)
{
return OvsGetPacketBytes(packet, sizeof *storage, ofs, storage);
}
static const IPHdr *
OvsGetIp(const NET_BUFFER_LIST *packet,
UINT32 ofs,
IPHdr *storage)
{
const IPHdr *ip = OvsGetPacketBytes(packet, sizeof *ip, ofs, storage);
if (ip) {
int ipLen = ip->ihl * 4;
if (ipLen < MIN_IPV4_HLEN ||
ipLen > MAX_IPV4_HLEN ||
OvsPacketLenNBL(packet) < ofs + ipLen) {
/* IP header is invalid, flag it */
return NULL;
} else {
return ip;
}
}
return NULL;
}
static const TCPHdr *
OvsGetTcp(const NET_BUFFER_LIST *packet,
UINT32 ofs,
TCPHdr *storage)
{
const TCPHdr *tcp = OvsGetPacketBytes(packet, sizeof *tcp, ofs, storage);
if (tcp) {
int tcpLen = tcp->doff * 4;
if (tcpLen >= sizeof *tcp && OvsPacketLenNBL(packet) >= ofs + tcpLen) {
return tcp;
}
}
return NULL;
}
static const UDPHdr *
OvsGetUdp(const NET_BUFFER_LIST *packet,
UINT32 ofs,
UDPHdr *storage)
{
return OvsGetPacketBytes(packet, sizeof *storage, ofs, storage);
}
static const SCTPHdr *
OvsGetSctp(const NET_BUFFER_LIST *packet,
UINT32 ofs,
SCTPHdr *storage)
{
return OvsGetPacketBytes(packet, sizeof *storage, ofs, storage);
}
static const ICMPHdr *
OvsGetIcmp(const NET_BUFFER_LIST *packet,
UINT32 ofs,
ICMPHdr *storage)
{
return OvsGetPacketBytes(packet, sizeof *storage, ofs, storage);
}
static const MPLSHdr *
OvsGetMpls(const NET_BUFFER_LIST *packet,
UINT32 ofs,
MPLSHdr *storage)
{
return OvsGetPacketBytes(packet, sizeof *storage, ofs, storage);
}
#endif /* __PACKET_PARSER_H_ */
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