/*
- * (C) Copyright 2000
- * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ * Copied from Linux Monitor (LiMon) - Networking.
*
- * See file CREDITS for list of people who contributed to this
- * project.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation; either version 2 of
- * the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
- * MA 02111-1307 USA
+ * Copyright 1994 - 2000 Neil Russell.
+ * (See License)
+ * Copyright 2000 Roland Borde
+ * Copyright 2000 Paolo Scaffardi
+ * Copyright 2000-2002 Wolfgang Denk, wd@denx.de
+ * SPDX-License-Identifier: GPL-2.0
*/
#include <common.h>
-#include <command.h>
-#include <net.h>
-#include "bootp.h"
-#include "tftp.h"
+
#include "arp.h"
-#if (CONFIG_COMMANDS & CFG_CMD_NET)
+#ifndef CONFIG_ARP_TIMEOUT
+/* Milliseconds before trying ARP again */
+# define ARP_TIMEOUT 5000UL
+#else
+# define ARP_TIMEOUT CONFIG_ARP_TIMEOUT
+#endif
+
-#define TIMEOUT 5 /* Seconds before trying ARP again */
#ifndef CONFIG_NET_RETRY_COUNT
-# define TIMEOUT_COUNT 5 /* # of timeouts before giving up */
+# define ARP_TIMEOUT_COUNT 5 /* # of timeouts before giving up */
#else
-# define TIMEOUT_COUNT (CONFIG_NET_RETRY_COUNT)
+# define ARP_TIMEOUT_COUNT CONFIG_NET_RETRY_COUNT
#endif
-static void ArpHandler(uchar *pkt, unsigned dest, unsigned src, unsigned len);
-static void ArpTimeout(void);
+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 *arp_wait_packet_ethaddr;
+int arp_wait_tx_packet_size;
+ulong arp_wait_timer_start;
+int arp_wait_try;
-int ArpTry = 0;
+static uchar *arp_tx_packet; /* THE ARP transmit packet */
+static uchar arp_tx_packet_buf[PKTSIZE_ALIGN + PKTALIGN];
-/*
- * Handle a ARP received packet.
- */
-static void
-ArpHandler(uchar *pkt, unsigned dest, unsigned src, unsigned len)
+void arp_init(void)
{
- /* Check if the frame is really an ARP reply */
- if (memcmp (NetServerEther, NetBcastAddr, 6) != 0) {
-#ifdef DEBUG
- printf("Got good ARP - start TFTP\n");
-#endif
- TftpStart ();
- }
+ /* XXX problem with bss workaround */
+ 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;
}
-
-/*
- * Timeout on ARP request.
- */
-static void
-ArpTimeout(void)
+void arp_raw_request(struct in_addr source_ip, const uchar *target_ethaddr,
+ struct in_addr target_ip)
{
- if (ArpTry >= TIMEOUT_COUNT) {
- puts ("\nRetry count exceeded; starting again\n");
- NetStartAgain ();
- } else {
- NetSetTimeout (TIMEOUT * CFG_HZ, ArpTimeout);
- ArpRequest ();
- }
-}
+ uchar *pkt;
+ struct arp_hdr *arp;
+ int eth_hdr_size;
+ debug_cond(DEBUG_DEV_PKT, "ARP broadcast %d\n", arp_wait_try);
-void
-ArpRequest (void)
-{
- int i;
- volatile uchar *pkt;
- ARP_t * arp;
-
- printf("ARP broadcast %d\n", ++ArpTry);
- pkt = NetTxPacket;
+ pkt = arp_tx_packet;
- NetSetEther(pkt, NetBcastAddr, PROT_ARP);
- pkt += ETHER_HDR_SIZE;
+ eth_hdr_size = net_set_ether(pkt, net_bcast_ethaddr, PROT_ARP);
+ pkt += eth_hdr_size;
- arp = (ARP_t *)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_op = htons(ARPOP_REQUEST);
-
- memcpy (&arp->ar_data[0], NetOurEther, 6); /* source ET addr */
- NetWriteIP((uchar*)&arp->ar_data[6], NetOurIP); /* source IP addr */
- for (i=10; i<16; ++i) {
- arp->ar_data[i] = 0; /* dest ET addr = 0 */
- }
+ arp->ar_hln = ARP_HLEN;
+ arp->ar_pln = ARP_PLEN;
+ arp->ar_op = htons(ARPOP_REQUEST);
+
+ 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 */
- if((NetServerIP & NetOurSubnetMask) != (NetOurIP & NetOurSubnetMask)) {
- if (NetOurGatewayIP == 0) {
- puts ("## Warning: gatewayip needed but not set\n");
- }
- NetWriteIP((uchar*)&arp->ar_data[16], NetOurGatewayIP);
+ 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");
+ net_arp_wait_reply_ip = net_arp_wait_packet_ip;
+ } else {
+ net_arp_wait_reply_ip = net_gateway;
+ }
} else {
- NetWriteIP((uchar*)&arp->ar_data[16], NetServerIP);
+ net_arp_wait_reply_ip = net_arp_wait_packet_ip;
}
+ arp_raw_request(net_ip, net_null_ethaddr, net_arp_wait_reply_ip);
+}
+
+void arp_timeout_check(void)
+{
+ ulong t;
+
+ if (!net_arp_wait_packet_ip.s_addr)
+ return;
- NetSendPacket(NetTxPacket, ETHER_HDR_SIZE + ARP_HDR_SIZE);
+ t = get_timer(0);
- NetSetTimeout(TIMEOUT * CFG_HZ, ArpTimeout);
- NetSetHandler(ArpHandler);
+ /* check for arp timeout */
+ if ((t - arp_wait_timer_start) > ARP_TIMEOUT) {
+ arp_wait_try++;
+
+ if (arp_wait_try >= ARP_TIMEOUT_COUNT) {
+ puts("\nARP Retry count exceeded; starting again\n");
+ arp_wait_try = 0;
+ net_start_again();
+ } else {
+ arp_wait_timer_start = t;
+ arp_request();
+ }
+ }
}
-#endif /* CFG_CMD_NET */
+void arp_receive(struct ethernet_hdr *et, struct ip_udp_hdr *ip, int len)
+{
+ struct arp_hdr *arp;
+ struct in_addr reply_ip_addr;
+ uchar *pkt;
+ int eth_hdr_size;
+
+ /*
+ * We have to deal with two types of ARP packets:
+ * - REQUEST packets will be answered by sending our
+ * IP address - if we know it.
+ * - REPLY packates are expected only after we asked
+ * for the TFTP server's or the gateway's ethernet
+ * address; so if we receive such a packet, we set
+ * the server ethernet address
+ */
+ debug_cond(DEBUG_NET_PKT, "Got ARP\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_hrd) != ARP_ETHER)
+ return;
+ if (ntohs(arp->ar_pro) != PROT_IP)
+ return;
+ if (arp->ar_hln != ARP_HLEN)
+ return;
+ if (arp->ar_pln != ARP_PLEN)
+ return;
+
+ if (net_ip.s_addr == 0)
+ return;
+
+ 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_cond(DEBUG_DEV_PKT, "Got ARP REQUEST, return our IP\n");
+ pkt = (uchar *)et;
+ eth_hdr_size = net_update_ether(et, et->et_src, PROT_ARP);
+ pkt += eth_hdr_size;
+ arp->ar_op = htons(ARPOP_REPLY);
+ 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
+ net_send_packet((uchar *)et, eth_hdr_size + ARP_HDR_SIZE);
+ return;
+
+ case ARPOP_REPLY: /* arp reply */
+ /* are we waiting for a reply */
+ if (!net_arp_wait_packet_ip.s_addr)
+ break;
+
+#ifdef CONFIG_KEEP_SERVERADDR
+ if (net_server_ip.s_addr == net_arp_wait_packet_ip.s_addr) {
+ char buf[20];
+ sprintf(buf, "%pM", &arp->ar_sha);
+ setenv("serveraddr", buf);
+ }
+#endif
+
+ reply_ip_addr = net_read_ip(&arp->ar_spa);
+
+ /* matched waiting packet's address */
+ 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 */
+ if (arp_wait_packet_ethaddr != NULL)
+ memcpy(arp_wait_packet_ethaddr,
+ &arp->ar_sha, ARP_HLEN);
+
+ net_get_arp_handler()((uchar *)arp, 0, reply_ip_addr,
+ 0, len);
+
+ /* 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:
+ debug("Unexpected ARP opcode 0x%x\n",
+ ntohs(arp->ar_op));
+ return;
+ }
+}
projects / karo-tx-uboot.git / blobdiff