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;
57 debug("ARP broadcast %d\n", NetArpWaitTry
);
61 eth_hdr_size
= NetSetEther(pkt
, NetBcastAddr
, PROT_ARP
);
64 arp
= (struct arp_hdr
*) pkt
;
66 arp
->ar_hrd
= htons(ARP_ETHER
);
67 arp
->ar_pro
= htons(PROT_IP
);
68 arp
->ar_hln
= ARP_HLEN
;
69 arp
->ar_pln
= ARP_PLEN
;
70 arp
->ar_op
= htons(ARPOP_REQUEST
);
73 memcpy(&arp
->ar_sha
, NetOurEther
, ARP_HLEN
);
75 NetWriteIP(&arp
->ar_spa
, NetOurIP
);
76 /* dest ET addr = 0 */
77 memset(&arp
->ar_tha
, 0, ARP_HLEN
);
78 if ((NetArpWaitPacketIP
& NetOurSubnetMask
) !=
79 (NetOurIP
& NetOurSubnetMask
)) {
80 if (NetOurGatewayIP
== 0) {
81 puts("## Warning: gatewayip needed but not set\n");
82 NetArpWaitReplyIP
= NetArpWaitPacketIP
;
84 NetArpWaitReplyIP
= NetOurGatewayIP
;
87 NetArpWaitReplyIP
= NetArpWaitPacketIP
;
90 NetWriteIP(&arp
->ar_tpa
, NetArpWaitReplyIP
);
91 (void) eth_send(NetTxPacket
, eth_hdr_size
+ ARP_HDR_SIZE
);
94 void ArpTimeoutCheck(void)
98 if (!NetArpWaitPacketIP
)
103 /* check for arp timeout */
104 if ((t
- NetArpWaitTimerStart
) > ARP_TIMEOUT
) {
107 if (NetArpWaitTry
>= ARP_TIMEOUT_COUNT
) {
108 puts("\nARP Retry count exceeded; starting again\n");
112 NetArpWaitTimerStart
= t
;
118 void ArpReceive(struct ethernet_hdr
*et
, struct ip_udp_hdr
*ip
, int len
)
121 IPaddr_t reply_ip_addr
;
126 * We have to deal with two types of ARP packets:
127 * - REQUEST packets will be answered by sending our
128 * IP address - if we know it.
129 * - REPLY packates are expected only after we asked
130 * for the TFTP server's or the gateway's ethernet
131 * address; so if we receive such a packet, we set
132 * the server ethernet address
136 arp
= (struct arp_hdr
*)ip
;
137 if (len
< ARP_HDR_SIZE
) {
138 printf("bad length %d < %d\n", len
, ARP_HDR_SIZE
);
141 if (ntohs(arp
->ar_hrd
) != ARP_ETHER
)
143 if (ntohs(arp
->ar_pro
) != PROT_IP
)
145 if (arp
->ar_hln
!= ARP_HLEN
)
147 if (arp
->ar_pln
!= ARP_PLEN
)
153 if (NetReadIP(&arp
->ar_tpa
) != NetOurIP
)
156 switch (ntohs(arp
->ar_op
)) {
158 /* reply with our IP address */
159 debug("Got ARP REQUEST, return our IP\n");
161 eth_hdr_size
= NetSetEther(pkt
, et
->et_src
, PROT_ARP
);
163 arp
->ar_op
= htons(ARPOP_REPLY
);
164 memcpy(&arp
->ar_tha
, &arp
->ar_sha
, ARP_HLEN
);
165 NetCopyIP(&arp
->ar_tpa
, &arp
->ar_spa
);
166 memcpy(&arp
->ar_sha
, NetOurEther
, ARP_HLEN
);
167 NetCopyIP(&arp
->ar_spa
, &NetOurIP
);
168 (void) eth_send((uchar
*)et
, eth_hdr_size
+ ARP_HDR_SIZE
);
171 case ARPOP_REPLY
: /* arp reply */
172 /* are we waiting for a reply */
173 if (!NetArpWaitPacketIP
|| !NetArpWaitPacketMAC
)
176 #ifdef CONFIG_KEEP_SERVERADDR
177 if (NetServerIP
== NetArpWaitPacketIP
) {
179 sprintf(buf
, "%pM", arp
->ar_sha
);
180 setenv("serveraddr", buf
);
184 reply_ip_addr
= NetReadIP(&arp
->ar_spa
);
186 /* matched waiting packet's address */
187 if (reply_ip_addr
== NetArpWaitReplyIP
) {
188 debug("Got ARP REPLY, set eth addr (%pM)\n",
191 /* save address for later use */
192 memcpy(NetArpWaitPacketMAC
,
193 &arp
->ar_sha
, ARP_HLEN
);
195 #ifdef CONFIG_NETCONSOLE
196 NetGetHandler()(0, 0, 0, 0, 0);
198 /* modify header, and transmit it */
199 memcpy(((struct ethernet_hdr
*)NetArpWaitTxPacket
)->
200 et_dest
, NetArpWaitPacketMAC
, ARP_HLEN
);
201 (void) eth_send(NetArpWaitTxPacket
,
202 NetArpWaitTxPacketSize
);
204 /* no arp request pending now */
205 NetArpWaitPacketIP
= 0;
206 NetArpWaitTxPacketSize
= 0;
207 NetArpWaitPacketMAC
= NULL
;
212 debug("Unexpected ARP opcode 0x%x\n",