X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=net%2Farp.c;h=b49c3d3ced97098e8e445cf8a7adb99efd715968;hb=2f760735c170c854ffca76be5607cec5c56fdc4f;hp=d36a642c5498b62066b40a2b52fca1fb4c08d0e4;hpb=1256793b1862dcd1a6e5ee51e155c2e214b06594;p=oweals%2Fu-boot.git

diff --git a/net/arp.c b/net/arp.c
index d36a642c54..b49c3d3ced 100644
--- a/net/arp.c
+++ b/net/arp.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
  *	Copied from Linux Monitor (LiMon) - Networking.
  *
@@ -26,98 +27,105 @@
 # define ARP_TIMEOUT_COUNT	CONFIG_NET_RETRY_COUNT
 #endif
 
-IPaddr_t	NetArpWaitPacketIP;
-IPaddr_t	NetArpWaitReplyIP;
+struct in_addr net_arp_wait_packet_ip;
+static struct in_addr net_arp_wait_reply_ip;
 /* MAC address of waiting packet's destination */
-uchar	       *NetArpWaitPacketMAC;
-/* THE transmit packet */
-uchar	       *NetArpWaitTxPacket;
-int		NetArpWaitTxPacketSize;
-uchar		NetArpWaitPacketBuf[PKTSIZE_ALIGN + PKTALIGN];
-ulong		NetArpWaitTimerStart;
-int		NetArpWaitTry;
-
-void ArpInit(void)
+uchar	       *arp_wait_packet_ethaddr;
+int		arp_wait_tx_packet_size;
+ulong		arp_wait_timer_start;
+int		arp_wait_try;
+uchar	       *arp_tx_packet; /* THE ARP transmit packet */
+static uchar	arp_tx_packet_buf[PKTSIZE_ALIGN + PKTALIGN];
+
+void arp_init(void)
 {
 	/* XXX problem with bss workaround */
-	NetArpWaitPacketMAC = NULL;
-	NetArpWaitPacketIP = 0;
-	NetArpWaitReplyIP = 0;
-	NetArpWaitTxPacket = &NetArpWaitPacketBuf[0] + (PKTALIGN - 1);
-	NetArpWaitTxPacket -= (ulong)NetArpWaitTxPacket % PKTALIGN;
-	NetArpWaitTxPacketSize = 0;
+	arp_wait_packet_ethaddr = NULL;
+	net_arp_wait_packet_ip.s_addr = 0;
+	net_arp_wait_reply_ip.s_addr = 0;
+	arp_wait_tx_packet_size = 0;
+	arp_tx_packet = &arp_tx_packet_buf[0] + (PKTALIGN - 1);
+	arp_tx_packet -= (ulong)arp_tx_packet % PKTALIGN;
 }
 
-void ArpRequest(void)
+void arp_raw_request(struct in_addr source_ip, const uchar *target_ethaddr,
+	struct in_addr target_ip)
 {
 	uchar *pkt;
 	struct arp_hdr *arp;
+	int eth_hdr_size;
 
-	debug("ARP broadcast %d\n", NetArpWaitTry);
+	debug_cond(DEBUG_DEV_PKT, "ARP broadcast %d\n", arp_wait_try);
 
-	pkt = NetTxPacket;
+	pkt = arp_tx_packet;
 
-	pkt += NetSetEther(pkt, NetBcastAddr, PROT_ARP);
+	eth_hdr_size = net_set_ether(pkt, net_bcast_ethaddr, PROT_ARP);
+	pkt += eth_hdr_size;
 
-	arp = (struct arp_hdr *) pkt;
+	arp = (struct arp_hdr *)pkt;
 
 	arp->ar_hrd = htons(ARP_ETHER);
 	arp->ar_pro = htons(PROT_IP);
-	arp->ar_hln = 6;
-	arp->ar_pln = 4;
+	arp->ar_hln = ARP_HLEN;
+	arp->ar_pln = ARP_PLEN;
 	arp->ar_op = htons(ARPOP_REQUEST);
 
-	/* source ET addr */
-	memcpy(&arp->ar_data[0], NetOurEther, 6);
-	/* source IP addr */
-	NetWriteIP((uchar *) &arp->ar_data[6], NetOurIP);
-	/* dest ET addr = 0 */
-	memset(&arp->ar_data[10], '\0', 6);
-	if ((NetArpWaitPacketIP & NetOurSubnetMask) !=
-	    (NetOurIP & NetOurSubnetMask)) {
-		if (NetOurGatewayIP == 0) {
+	memcpy(&arp->ar_sha, net_ethaddr, ARP_HLEN);	/* source ET addr */
+	net_write_ip(&arp->ar_spa, source_ip);		/* source IP addr */
+	memcpy(&arp->ar_tha, target_ethaddr, ARP_HLEN);	/* target ET addr */
+	net_write_ip(&arp->ar_tpa, target_ip);		/* target IP addr */
+
+	net_send_packet(arp_tx_packet, eth_hdr_size + ARP_HDR_SIZE);
+}
+
+void arp_request(void)
+{
+	if ((net_arp_wait_packet_ip.s_addr & net_netmask.s_addr) !=
+	    (net_ip.s_addr & net_netmask.s_addr)) {
+		if (net_gateway.s_addr == 0) {
 			puts("## Warning: gatewayip needed but not set\n");
-			NetArpWaitReplyIP = NetArpWaitPacketIP;
+			net_arp_wait_reply_ip = net_arp_wait_packet_ip;
 		} else {
-			NetArpWaitReplyIP = NetOurGatewayIP;
+			net_arp_wait_reply_ip = net_gateway;
 		}
 	} else {
-		NetArpWaitReplyIP = NetArpWaitPacketIP;
+		net_arp_wait_reply_ip = net_arp_wait_packet_ip;
 	}
 
-	NetWriteIP((uchar *) &arp->ar_data[16], NetArpWaitReplyIP);
-	(void) eth_send(NetTxPacket, (pkt - NetTxPacket) + ARP_HDR_SIZE);
+	arp_raw_request(net_ip, net_null_ethaddr, net_arp_wait_reply_ip);
 }
 
-void ArpTimeoutCheck(void)
+int arp_timeout_check(void)
 {
 	ulong t;
 
-	if (!NetArpWaitPacketIP)
-		return;
+	if (!arp_is_waiting())
+		return 0;
 
 	t = get_timer(0);
 
 	/* check for arp timeout */
-	if ((t - NetArpWaitTimerStart) > ARP_TIMEOUT) {
-		NetArpWaitTry++;
+	if ((t - arp_wait_timer_start) > ARP_TIMEOUT) {
+		arp_wait_try++;
 
-		if (NetArpWaitTry >= ARP_TIMEOUT_COUNT) {
+		if (arp_wait_try >= ARP_TIMEOUT_COUNT) {
 			puts("\nARP Retry count exceeded; starting again\n");
-			NetArpWaitTry = 0;
-			NetStartAgain();
+			arp_wait_try = 0;
+			net_set_state(NETLOOP_FAIL);
 		} else {
-			NetArpWaitTimerStart = t;
-			ArpRequest();
+			arp_wait_timer_start = t;
+			arp_request();
 		}
 	}
+	return 1;
 }
 
-void ArpReceive(struct ethernet_hdr *et, struct ip_udp_hdr *ip, int len)
+void arp_receive(struct ethernet_hdr *et, struct ip_udp_hdr *ip, int len)
 {
 	struct arp_hdr *arp;
-	IPaddr_t reply_ip_addr;
-	uchar *pkt;
+	struct in_addr reply_ip_addr;
+	int eth_hdr_size;
+	uchar *tx_packet;
 
 	/*
 	 * We have to deal with two types of ARP packets:
@@ -128,7 +136,7 @@ void ArpReceive(struct ethernet_hdr *et, struct ip_udp_hdr *ip, int len)
 	 *   address; so if we receive such a packet, we set
 	 *   the server ethernet address
 	 */
-	debug("Got ARP\n");
+	debug_cond(DEBUG_NET_PKT, "Got ARP\n");
 
 	arp = (struct arp_hdr *)ip;
 	if (len < ARP_HDR_SIZE) {
@@ -139,70 +147,85 @@ void ArpReceive(struct ethernet_hdr *et, struct ip_udp_hdr *ip, int len)
 		return;
 	if (ntohs(arp->ar_pro) != PROT_IP)
 		return;
-	if (arp->ar_hln != 6)
+	if (arp->ar_hln != ARP_HLEN)
 		return;
-	if (arp->ar_pln != 4)
+	if (arp->ar_pln != ARP_PLEN)
 		return;
 
-	if (NetOurIP == 0)
+	if (net_ip.s_addr == 0)
 		return;
 
-	if (NetReadIP(&arp->ar_data[16]) != NetOurIP)
+	if (net_read_ip(&arp->ar_tpa).s_addr != net_ip.s_addr)
 		return;
 
 	switch (ntohs(arp->ar_op)) {
 	case ARPOP_REQUEST:
 		/* reply with our IP address */
-		debug("Got ARP REQUEST, return our IP\n");
-		pkt = (uchar *)et;
-		pkt += NetSetEther(pkt, et->et_src, PROT_ARP);
+		debug_cond(DEBUG_DEV_PKT, "Got ARP REQUEST, return our IP\n");
+		eth_hdr_size = net_update_ether(et, et->et_src, PROT_ARP);
 		arp->ar_op = htons(ARPOP_REPLY);
-		memcpy(&arp->ar_data[10], &arp->ar_data[0], 6);
-		NetCopyIP(&arp->ar_data[16], &arp->ar_data[6]);
-		memcpy(&arp->ar_data[0], NetOurEther, 6);
-		NetCopyIP(&arp->ar_data[6], &NetOurIP);
-		(void) eth_send((uchar *)et,
-				(pkt - (uchar *)et) + ARP_HDR_SIZE);
+		memcpy(&arp->ar_tha, &arp->ar_sha, ARP_HLEN);
+		net_copy_ip(&arp->ar_tpa, &arp->ar_spa);
+		memcpy(&arp->ar_sha, net_ethaddr, ARP_HLEN);
+		net_copy_ip(&arp->ar_spa, &net_ip);
+
+#ifdef CONFIG_CMD_LINK_LOCAL
+		/*
+		 * Work-around for brain-damaged Cisco equipment with
+		 *   arp-proxy enabled.
+		 *
+		 *   If the requesting IP is not on our subnet, wait 5ms to
+		 *   reply to ARP request so that our reply will overwrite
+		 *   the arp-proxy's instead of the other way around.
+		 */
+		if ((net_read_ip(&arp->ar_tpa).s_addr & net_netmask.s_addr) !=
+		    (net_read_ip(&arp->ar_spa).s_addr & net_netmask.s_addr))
+			udelay(5000);
+#endif
+		tx_packet = net_get_async_tx_pkt_buf();
+		memcpy(tx_packet, et, eth_hdr_size + ARP_HDR_SIZE);
+		net_send_packet(tx_packet, eth_hdr_size + ARP_HDR_SIZE);
 		return;
 
 	case ARPOP_REPLY:		/* arp reply */
-		/* are we waiting for a reply */
-		if (!NetArpWaitPacketIP || !NetArpWaitPacketMAC)
+		/* are we waiting for a reply? */
+		if (!arp_is_waiting())
 			break;
 
 #ifdef CONFIG_KEEP_SERVERADDR
-		if (NetServerIP == NetArpWaitPacketIP) {
+		if (net_server_ip.s_addr == net_arp_wait_packet_ip.s_addr) {
 			char buf[20];
-			sprintf(buf, "%pM", arp->ar_data);
-			setenv("serveraddr", buf);
+			sprintf(buf, "%pM", &arp->ar_sha);
+			env_set("serveraddr", buf);
 		}
 #endif
 
-		reply_ip_addr = NetReadIP(&arp->ar_data[6]);
+		reply_ip_addr = net_read_ip(&arp->ar_spa);
 
 		/* matched waiting packet's address */
-		if (reply_ip_addr == NetArpWaitReplyIP) {
-			debug("Got ARP REPLY, set eth addr (%pM)\n",
-				arp->ar_data);
+		if (reply_ip_addr.s_addr == net_arp_wait_reply_ip.s_addr) {
+			debug_cond(DEBUG_DEV_PKT,
+				   "Got ARP REPLY, set eth addr (%pM)\n",
+				   arp->ar_data);
 
 			/* save address for later use */
-			memcpy(NetArpWaitPacketMAC,
-			       &arp->ar_data[0], 6);
+			if (arp_wait_packet_ethaddr != NULL)
+				memcpy(arp_wait_packet_ethaddr,
+				       &arp->ar_sha, ARP_HLEN);
 
-#ifdef CONFIG_NETCONSOLE
-			NetGetHandler()(0, 0, 0, 0, 0);
-#endif
-			/* modify header, and transmit it */
-			memcpy(((struct ethernet_hdr *)NetArpWaitTxPacket)->
-				et_dest, NetArpWaitPacketMAC, 6);
-			(void) eth_send(NetArpWaitTxPacket,
-					NetArpWaitTxPacketSize);
+			net_get_arp_handler()((uchar *)arp, 0, reply_ip_addr,
+					      0, len);
 
-			/* no arp request pending now */
-			NetArpWaitPacketIP = 0;
-			NetArpWaitTxPacketSize = 0;
-			NetArpWaitPacketMAC = NULL;
+			/* set the mac address in the waiting packet's header
+			   and transmit it */
+			memcpy(((struct ethernet_hdr *)net_tx_packet)->et_dest,
+			       &arp->ar_sha, ARP_HLEN);
+			net_send_packet(net_tx_packet, arp_wait_tx_packet_size);
 
+			/* no arp request pending now */
+			net_arp_wait_packet_ip.s_addr = 0;
+			arp_wait_tx_packet_size = 0;
+			arp_wait_packet_ethaddr = NULL;
 		}
 		return;
 	default:
@@ -211,3 +234,8 @@ void ArpReceive(struct ethernet_hdr *et, struct ip_udp_hdr *ip, int len)
 		return;
 	}
 }
+
+bool arp_is_waiting(void)
+{
+	return !!net_arp_wait_packet_ip.s_addr;
+}