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14aba9c1
编写于
9月 28, 2002
作者:
W
wdenk
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3861aa5c
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net/arp.c
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14aba9c1
/*
* (C) Copyright 2000
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
*
* See file CREDITS for list of people who contributed to this
* project.
*
* 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; either version 2 of
* the License, or (at your option) any later version.
*
* 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, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
#include <common.h>
#include <command.h>
#include <net.h>
#include "bootp.h"
#include "tftp.h"
#include "arp.h"
#if (CONFIG_COMMANDS & CFG_CMD_NET)
#define TIMEOUT 5
/* Seconds before trying ARP again */
#ifndef CONFIG_NET_RETRY_COUNT
# define TIMEOUT_COUNT 5
/* # of timeouts before giving up */
#else
# define TIMEOUT_COUNT (CONFIG_NET_RETRY_COUNT)
#endif
static
void
ArpHandler
(
uchar
*
pkt
,
unsigned
dest
,
unsigned
src
,
unsigned
len
);
static
void
ArpTimeout
(
void
);
int
ArpTry
=
0
;
/*
* Handle a ARP received packet.
*/
static
void
ArpHandler
(
uchar
*
pkt
,
unsigned
dest
,
unsigned
src
,
unsigned
len
)
{
/* Check if the frame is really an ARP reply */
if
(
memcmp
(
NetServerEther
,
NetBcastAddr
,
6
)
!=
0
)
{
#ifdef DEBUG
printf
(
"Got good ARP - start TFTP
\n
"
);
#endif
TftpStart
();
}
}
/*
* Timeout on ARP request.
*/
static
void
ArpTimeout
(
void
)
{
if
(
ArpTry
>=
TIMEOUT_COUNT
)
{
puts
(
"
\n
Retry count exceeded; starting again
\n
"
);
NetStartAgain
();
}
else
{
NetSetTimeout
(
TIMEOUT
*
CFG_HZ
,
ArpTimeout
);
ArpRequest
();
}
}
void
ArpRequest
(
void
)
{
int
i
;
volatile
uchar
*
pkt
;
ARP_t
*
arp
;
printf
(
"ARP broadcast %d
\n
"
,
++
ArpTry
);
pkt
=
NetTxPacket
;
NetSetEther
(
pkt
,
NetBcastAddr
,
PROT_ARP
);
pkt
+=
ETHER_HDR_SIZE
;
arp
=
(
ARP_t
*
)
pkt
;
arp
->
ar_hrd
=
htons
(
ARP_ETHER
);
arp
->
ar_pro
=
htons
(
PROT_IP
);
arp
->
ar_hln
=
6
;
arp
->
ar_pln
=
4
;
arp
->
ar_op
=
htons
(
ARPOP_REQUEST
);
memcpy
(
&
arp
->
ar_data
[
0
],
NetOurEther
,
6
);
/* source ET addr */
NetWriteIP
((
uchar
*
)
&
arp
->
ar_data
[
6
],
NetOurIP
);
/* source IP addr */
for
(
i
=
10
;
i
<
16
;
++
i
)
{
arp
->
ar_data
[
i
]
=
0
;
/* dest ET addr = 0 */
}
if
((
NetServerIP
&
NetOurSubnetMask
)
!=
(
NetOurIP
&
NetOurSubnetMask
))
{
if
(
NetOurGatewayIP
==
0
)
{
puts
(
"## Warning: gatewayip needed but not set
\n
"
);
}
NetWriteIP
((
uchar
*
)
&
arp
->
ar_data
[
16
],
NetOurGatewayIP
);
}
else
{
NetWriteIP
((
uchar
*
)
&
arp
->
ar_data
[
16
],
NetServerIP
);
}
NetSendPacket
(
NetTxPacket
,
ETHER_HDR_SIZE
+
ARP_HDR_SIZE
);
NetSetTimeout
(
TIMEOUT
*
CFG_HZ
,
ArpTimeout
);
NetSetHandler
(
ArpHandler
);
}
#endif
/* CFG_CMD_NET */
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