1 files changed, 99 insertions, 0 deletions
diff --git a/roms/u-boot/net/rarp.c b/roms/u-boot/net/rarp.c
new file mode 100644
index 000000000..a676a4253
--- /dev/null
+++ b/roms/u-boot/net/rarp.c
@@ -0,0 +1,99 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * (C) Copyright 2000-2002
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ */
+
+#include <common.h>
+#include <command.h>
+#include <log.h>
+#include <net.h>
+#include <net/tftp.h>
+#include "nfs.h"
+#include "bootp.h"
+#include "rarp.h"
+
+#define TIMEOUT 5000UL /* Milliseconds before trying BOOTP again */
+#ifndef	CONFIG_NET_RETRY_COUNT
+#define TIMEOUT_COUNT 5 /* # of timeouts before giving up  */
+#else
+#define TIMEOUT_COUNT (CONFIG_NET_RETRY_COUNT)
+#endif
+
+int rarp_try;
+
+/*
+ *	Handle a RARP received packet.
+ */
+void rarp_receive(struct ip_udp_hdr *ip, unsigned len)
+{
+	struct arp_hdr *arp;
+
+	debug_cond(DEBUG_NET_PKT, "Got RARP\n");
+	arp = (struct arp_hdr *)ip;
+	if (len < ARP_HDR_SIZE) {
+		printf("bad length %d < %d\n", len, ARP_HDR_SIZE);
+		return;
+	}
+
+	if ((ntohs(arp->ar_op) != RARPOP_REPLY) ||
+	    (ntohs(arp->ar_hrd) != ARP_ETHER)   ||
+	    (ntohs(arp->ar_pro) != PROT_IP)     ||
+	    (arp->ar_hln != 6) || (arp->ar_pln != 4)) {
+		puts("invalid RARP header\n");
+	} else {
+		net_copy_ip(&net_ip, &arp->ar_data[16]);
+		if (net_server_ip.s_addr == 0)
+			net_copy_ip(&net_server_ip, &arp->ar_data[6]);
+		memcpy(net_server_ethaddr, &arp->ar_data[0], 6);
+		debug_cond(DEBUG_DEV_PKT, "Got good RARP\n");
+		net_auto_load();
+	}
+}
+
+
+/*
+ *	Timeout on BOOTP request.
+ */
+static void rarp_timeout_handler(void)
+{
+	if (rarp_try >= TIMEOUT_COUNT) {
+		puts("\nRetry count exceeded; starting again\n");
+		net_start_again();
+	} else {
+		net_set_timeout_handler(TIMEOUT, rarp_timeout_handler);
+		rarp_request();
+	}
+}
+
+
+void rarp_request(void)
+{
+	uchar *pkt;
+	struct arp_hdr *rarp;
+	int eth_hdr_size;
+
+	printf("RARP broadcast %d\n", ++rarp_try);
+	pkt = net_tx_packet;
+
+	eth_hdr_size = net_set_ether(pkt, net_bcast_ethaddr, PROT_RARP);
+	pkt += eth_hdr_size;
+
+	rarp = (struct arp_hdr *)pkt;
+
+	rarp->ar_hrd = htons(ARP_ETHER);
+	rarp->ar_pro = htons(PROT_IP);
+	rarp->ar_hln = 6;
+	rarp->ar_pln = 4;
+	rarp->ar_op  = htons(RARPOP_REQUEST);
+	memcpy(&rarp->ar_data[0],  net_ethaddr, 6);	/* source ET addr */
+	memcpy(&rarp->ar_data[6],  &net_ip,   4);	/* source IP addr */
+	/* dest ET addr = source ET addr ??*/
+	memcpy(&rarp->ar_data[10], net_ethaddr, 6);
+	/* dest IP addr set to broadcast */
+	memset(&rarp->ar_data[16], 0xff,        4);
+
+	net_send_packet(net_tx_packet, eth_hdr_size + ARP_HDR_SIZE);
+
+	net_set_timeout_handler(TIMEOUT, rarp_timeout_handler);
+}