1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
|
/* $Id: VBoxNetARP.cpp $ */
/** @file
* VBoxNetARP - IntNet ARP Client Routines.
*/
/*
* Copyright (C) 2009-2023 Oracle and/or its affiliates.
*
* This file is part of VirtualBox base platform packages, as
* available from https://www.virtualbox.org.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation, in version 3 of the
* License.
*
* 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
* along with this program; if not, see <https://www.gnu.org/licenses>.
*
* SPDX-License-Identifier: GPL-3.0-only
*/
/*********************************************************************************************************************************
* Header Files *
*********************************************************************************************************************************/
#define LOG_GROUP LOG_GROUP_DEFAULT
#include "VBoxNetLib.h"
#include <iprt/string.h>
#include <VBox/intnetinline.h>
#include <VBox/log.h>
/**
* Deal with ARP queries.
*
* @returns true if ARP.
*
* @param pSession The support driver session.
* @param hIf The internal network interface handle.
* @param pBuf The internal network interface buffer.
* @param pMacAddr Our MAC address.
* @param IPv4Addr Our IPv4 address.
*/
bool VBoxNetArpHandleIt(PSUPDRVSESSION pSession, INTNETIFHANDLE hIf, PINTNETBUF pBuf, PCRTMAC pMacAddr, RTNETADDRIPV4 IPv4Addr)
{
/*
* Valid IntNet Ethernet frame? Skip GSO, no ARP in there.
*/
PCINTNETHDR pHdr = IntNetRingGetNextFrameToRead(&pBuf->Recv);
if ( !pHdr
|| pHdr->u8Type != INTNETHDR_TYPE_FRAME)
return false;
size_t cbFrame = pHdr->cbFrame;
const void *pvFrame = IntNetHdrGetFramePtr(pHdr, pBuf);
PCRTNETETHERHDR pEthHdr = (PCRTNETETHERHDR)pvFrame;
/*
* Arp frame?
*/
if (pEthHdr->EtherType != RT_H2N_U16_C(RTNET_ETHERTYPE_ARP))
return false;
if ( ( pEthHdr->DstMac.au16[0] != 0xffff
|| pEthHdr->DstMac.au16[1] != 0xffff
|| pEthHdr->DstMac.au16[2] != 0xffff)
&& ( pEthHdr->DstMac.au16[0] != pMacAddr->au16[0]
|| pEthHdr->DstMac.au16[1] != pMacAddr->au16[1]
|| pEthHdr->DstMac.au16[2] != pMacAddr->au16[2])
)
return false;
if (cbFrame < sizeof(RTNETARPIPV4) + sizeof(RTNETETHERHDR))
return false;
PCRTNETARPHDR pArpHdr = (PCRTNETARPHDR)(pEthHdr + 1);
if (pArpHdr->ar_htype != RT_H2N_U16_C(RTNET_ARP_ETHER))
return false;
if (pArpHdr->ar_hlen != sizeof(RTMAC))
return false;
if (pArpHdr->ar_ptype != RT_H2N_U16_C(RTNET_ETHERTYPE_IPV4))
return false;
if (pArpHdr->ar_plen != sizeof(RTNETADDRIPV4))
return false;
/* It's ARP, alright. Anything we need to do something about. */
PCRTNETARPIPV4 pArp = (PCRTNETARPIPV4)pArpHdr;
switch (pArp->Hdr.ar_oper)
{
case RT_H2N_U16_C(RTNET_ARPOP_REQUEST):
case RT_H2N_U16_C(RTNET_ARPOP_REVREQUEST):
case RT_H2N_U16_C(RTNET_ARPOP_INVREQUEST):
break;
default:
return true;
}
/*
* Deal with the queries.
*/
RTNETARPIPV4 Reply;
switch (pArp->Hdr.ar_oper)
{
/* 'Who has ar_tpa? Tell ar_spa.' */
case RT_H2N_U16_C(RTNET_ARPOP_REQUEST):
if (pArp->ar_tpa.u != IPv4Addr.u)
return true;
Reply.Hdr.ar_oper = RT_H2N_U16_C(RTNET_ARPOP_REPLY);
break;
case RT_H2N_U16_C(RTNET_ARPOP_REVREQUEST):
if ( pArp->ar_tha.au16[0] != pMacAddr->au16[0]
|| pArp->ar_tha.au16[1] != pMacAddr->au16[1]
|| pArp->ar_tha.au16[2] != pMacAddr->au16[2])
return true;
Reply.Hdr.ar_oper = RT_H2N_U16_C(RTNET_ARPOP_REVREPLY);
break;
case RT_H2N_U16_C(RTNET_ARPOP_INVREQUEST):
/** @todo RTNET_ARPOP_INVREQUEST */
return true;
//Reply.Hdr.ar_oper = RT_H2N_U16_C(RTNET_ARPOP_INVREPLY);
//break;
}
/*
* Complete the reply and send it.
*/
Reply.Hdr.ar_htype = RT_H2N_U16_C(RTNET_ARP_ETHER);
Reply.Hdr.ar_ptype = RT_H2N_U16_C(RTNET_ETHERTYPE_IPV4);
Reply.Hdr.ar_hlen = sizeof(RTMAC);
Reply.Hdr.ar_plen = sizeof(RTNETADDRIPV4);
Reply.ar_sha = *pMacAddr;
Reply.ar_spa = IPv4Addr;
Reply.ar_tha = pArp->ar_sha;
Reply.ar_tpa = pArp->ar_spa;
RTNETETHERHDR EthHdr;
EthHdr.DstMac = pArp->ar_sha;
EthHdr.SrcMac = *pMacAddr;
EthHdr.EtherType = RT_H2N_U16_C(RTNET_ETHERTYPE_ARP);
uint8_t abTrailer[60 - sizeof(Reply) - sizeof(EthHdr)];
RT_ZERO(abTrailer);
INTNETSEG aSegs[3];
aSegs[0].cb = sizeof(EthHdr);
aSegs[0].pv = &EthHdr;
aSegs[1].pv = &Reply;
aSegs[1].cb = sizeof(Reply);
aSegs[2].pv = &abTrailer[0];
aSegs[2].cb = sizeof(abTrailer);
VBoxNetIntIfSend(pSession, hIf, pBuf, RT_ELEMENTS(aSegs), &aSegs[0], true /* fFlush */);
return true;
}
|
