2 * Copied from Linux Monitor (LiMon) - Networking.
4 * Copyright 1994 - 2000 Neil Russell.
6 * Copyright 2000 Roland Borde
7 * Copyright 2000 Paolo Scaffardi
8 * Copyright 2000-2002 Wolfgang Denk, wd@denx.de
15 #ifndef CONFIG_ARP_TIMEOUT
16 /* Milliseconds before trying ARP again */
17 # define ARP_TIMEOUT 5000UL
19 # define ARP_TIMEOUT CONFIG_ARP_TIMEOUT
23 #ifndef CONFIG_NET_RETRY_COUNT
24 # define ARP_TIMEOUT_COUNT 5 /* # of timeouts before giving up */
26 # define ARP_TIMEOUT_COUNT CONFIG_NET_RETRY_COUNT
29 IPaddr_t NetArpWaitPacketIP
;
30 IPaddr_t NetArpWaitReplyIP
;
31 /* MAC address of waiting packet's destination */
32 uchar
*NetArpWaitPacketMAC
;
33 /* THE transmit packet */
34 uchar
*NetArpWaitTxPacket
;
35 int NetArpWaitTxPacketSize
;
36 uchar NetArpWaitPacketBuf
[PKTSIZE_ALIGN
+ PKTALIGN
];
37 ulong NetArpWaitTimerStart
;
42 /* XXX problem with bss workaround */
43 NetArpWaitPacketMAC
= NULL
;
44 NetArpWaitPacketIP
= 0;
45 NetArpWaitReplyIP
= 0;
46 NetArpWaitTxPacket
= &NetArpWaitPacketBuf
[0] + (PKTALIGN
- 1);
47 NetArpWaitTxPacket
-= (ulong
)NetArpWaitTxPacket
% PKTALIGN
;
48 NetArpWaitTxPacketSize
= 0;
56 debug("ARP broadcast %d\n", NetArpWaitTry
);
60 pkt
+= NetSetEther(pkt
, NetBcastAddr
, PROT_ARP
);
64 arp
->ar_hrd
= htons(ARP_ETHER
);
65 arp
->ar_pro
= htons(PROT_IP
);
68 arp
->ar_op
= htons(ARPOP_REQUEST
);
71 memcpy(&arp
->ar_data
[0], NetOurEther
, 6);
73 NetWriteIP((uchar
*) &arp
->ar_data
[6], NetOurIP
);
74 /* dest ET addr = 0 */
75 memset(&arp
->ar_data
[10], '\0', 6);
76 if ((NetArpWaitPacketIP
& NetOurSubnetMask
) !=
77 (NetOurIP
& NetOurSubnetMask
)) {
78 if (NetOurGatewayIP
== 0) {
79 puts("## Warning: gatewayip needed but not set\n");
80 NetArpWaitReplyIP
= NetArpWaitPacketIP
;
82 NetArpWaitReplyIP
= NetOurGatewayIP
;
85 NetArpWaitReplyIP
= NetArpWaitPacketIP
;
88 NetWriteIP((uchar
*) &arp
->ar_data
[16], NetArpWaitReplyIP
);
89 (void) eth_send(NetTxPacket
, (pkt
- NetTxPacket
) + ARP_HDR_SIZE
);
92 void ArpTimeoutCheck(void)
96 if (!NetArpWaitPacketIP
)
101 /* check for arp timeout */
102 if ((t
- NetArpWaitTimerStart
) > ARP_TIMEOUT
) {
105 if (NetArpWaitTry
>= ARP_TIMEOUT_COUNT
) {
106 puts("\nARP Retry count exceeded; starting again\n");
110 NetArpWaitTimerStart
= t
;
116 void ArpReceive(Ethernet_t
*et
, IP_t
*ip
, int len
)
123 * We have to deal with two types of ARP packets:
124 * - REQUEST packets will be answered by sending our
125 * IP address - if we know it.
126 * - REPLY packates are expected only after we asked
127 * for the TFTP server's or the gateway's ethernet
128 * address; so if we receive such a packet, we set
129 * the server ethernet address
134 if (len
< ARP_HDR_SIZE
) {
135 printf("bad length %d < %d\n", len
, ARP_HDR_SIZE
);
138 if (ntohs(arp
->ar_hrd
) != ARP_ETHER
)
140 if (ntohs(arp
->ar_pro
) != PROT_IP
)
142 if (arp
->ar_hln
!= 6)
144 if (arp
->ar_pln
!= 4)
150 if (NetReadIP(&arp
->ar_data
[16]) != NetOurIP
)
153 switch (ntohs(arp
->ar_op
)) {
155 /* reply with our IP address */
156 debug("Got ARP REQUEST, return our IP\n");
158 pkt
+= NetSetEther(pkt
, et
->et_src
, PROT_ARP
);
159 arp
->ar_op
= htons(ARPOP_REPLY
);
160 memcpy(&arp
->ar_data
[10], &arp
->ar_data
[0], 6);
161 NetCopyIP(&arp
->ar_data
[16], &arp
->ar_data
[6]);
162 memcpy(&arp
->ar_data
[0], NetOurEther
, 6);
163 NetCopyIP(&arp
->ar_data
[6], &NetOurIP
);
164 (void) eth_send((uchar
*)et
,
165 (pkt
- (uchar
*)et
) + ARP_HDR_SIZE
);
168 case ARPOP_REPLY
: /* arp reply */
169 /* are we waiting for a reply */
170 if (!NetArpWaitPacketIP
|| !NetArpWaitPacketMAC
)
173 #ifdef CONFIG_KEEP_SERVERADDR
174 if (NetServerIP
== NetArpWaitPacketIP
) {
176 sprintf(buf
, "%pM", arp
->ar_data
);
177 setenv("serveraddr", buf
);
181 tmp
= NetReadIP(&arp
->ar_data
[6]);
183 /* matched waiting packet's address */
184 if (tmp
== NetArpWaitReplyIP
) {
185 debug("Got ARP REPLY, set eth addr (%pM)\n",
188 /* save address for later use */
189 memcpy(NetArpWaitPacketMAC
,
190 &arp
->ar_data
[0], 6);
192 #ifdef CONFIG_NETCONSOLE
193 NetGetHandler()(0, 0, 0, 0, 0);
195 /* modify header, and transmit it */
196 memcpy(((Ethernet_t
*)NetArpWaitTxPacket
)->
197 et_dest
, NetArpWaitPacketMAC
, 6);
198 (void) eth_send(NetArpWaitTxPacket
,
199 NetArpWaitTxPacketSize
);
201 /* no arp request pending now */
202 NetArpWaitPacketIP
= 0;
203 NetArpWaitTxPacketSize
= 0;
204 NetArpWaitPacketMAC
= NULL
;
209 debug("Unexpected ARP opcode 0x%x\n",