net: Remove static allocation for MAC address in PingSend()

Don't force ARP clients to return the MAC address if they don't care
(such as ping)

Signed-off-by: Joe Hershberger <joe.hershberger@ni.com>
Acked-by: Mike Frysinger <vapier@gentoo.org>

net/arp.c

@@ -170,7 +170,7 @@ void ArpReceive(struct ethernet_hdr *et, struct ip_udp_hdr *ip, int len)
 
 	case ARPOP_REPLY:		/* arp reply */
 		/* are we waiting for a reply */
-		if (!NetArpWaitPacketIP || !NetArpWaitPacketMAC)
+		if (!NetArpWaitPacketIP)
 			break;
 
 #ifdef CONFIG_KEEP_SERVERADDR
@@ -189,15 +189,16 @@ void ArpReceive(struct ethernet_hdr *et, struct ip_udp_hdr *ip, int len)
 				arp->ar_data);
 
 			/* save address for later use */
-			memcpy(NetArpWaitPacketMAC,
-				&arp->ar_sha, ARP_HLEN);
+			if (NetArpWaitPacketMAC != NULL)
+				memcpy(NetArpWaitPacketMAC,
+				       &arp->ar_sha, ARP_HLEN);
 
 			net_get_arp_handler()((uchar *)arp, 0, reply_ip_addr,
 				0, len);
 
 			/* modify header, and transmit it */
 			memcpy(((struct ethernet_hdr *)NetArpWaitTxPacket)->
-				et_dest, NetArpWaitPacketMAC, ARP_HLEN);
+				et_dest, &arp->ar_sha, ARP_HLEN);
 			NetSendPacket(NetArpWaitTxPacket,
 					NetArpWaitTxPacketSize);
 

net/ping.c

@@ -40,22 +40,18 @@ static void set_icmp_header(uchar *pkt, IPaddr_t dest)
 
 static int ping_send(void)
 {
-	static uchar mac[6];
 	uchar *pkt;
 	int eth_hdr_size;
 
 	/* XXX always send arp request */
 
-	memcpy(mac, NetEtherNullAddr, 6);
-
 	debug("sending ARP for %pI4\n", &NetPingIP);
 
 	NetArpWaitPacketIP = NetPingIP;
-	NetArpWaitPacketMAC = mac;
 
-	pkt = NetArpWaitTxPacket;
-	eth_hdr_size = NetSetEther(pkt, mac, PROT_IP);
-	pkt += eth_hdr_size;
+	eth_hdr_size = NetSetEther(NetArpWaitTxPacket, NetEtherNullAddr,
+		PROT_IP);
+	pkt = NetArpWaitTxPacket + eth_hdr_size;
 
 	set_icmp_header(pkt, NetPingIP);