blob: 0b086dc8d2108e59ff034dd4be8c316777914404 [file] [log] [blame]
Tom Rinif739fcd2018-05-07 17:02:21 -04001// SPDX-License-Identifier: GPL-2.0
Joe Hershbergerd280d3f2012-05-23 07:58:01 +00002/*
3 * Copied from Linux Monitor (LiMon) - Networking.
4 *
5 * Copyright 1994 - 2000 Neil Russell.
6 * (See License)
7 * Copyright 2000 Roland Borde
8 * Copyright 2000 Paolo Scaffardi
9 * Copyright 2000-2002 Wolfgang Denk, wd@denx.de
10 */
11
12#include <common.h>
Simon Glass09140112020-05-10 11:40:03 -060013#include <env.h>
Simon Glassf7ae49f2020-05-10 11:40:05 -060014#include <log.h>
Simon Glass90526e92020-05-10 11:39:56 -060015#include <net.h>
Simon Glassc05ed002020-05-10 11:40:11 -060016#include <linux/delay.h>
Joe Hershbergerd280d3f2012-05-23 07:58:01 +000017
18#include "arp.h"
19
20#ifndef CONFIG_ARP_TIMEOUT
21/* Milliseconds before trying ARP again */
22# define ARP_TIMEOUT 5000UL
23#else
24# define ARP_TIMEOUT CONFIG_ARP_TIMEOUT
25#endif
26
27
28#ifndef CONFIG_NET_RETRY_COUNT
29# define ARP_TIMEOUT_COUNT 5 /* # of timeouts before giving up */
30#else
31# define ARP_TIMEOUT_COUNT CONFIG_NET_RETRY_COUNT
32#endif
33
Joe Hershberger049a95a2015-04-08 01:41:01 -050034struct in_addr net_arp_wait_packet_ip;
35static struct in_addr net_arp_wait_reply_ip;
Joe Hershbergerd280d3f2012-05-23 07:58:01 +000036/* MAC address of waiting packet's destination */
Joe Hershberger85d25e02015-04-08 01:41:08 -050037uchar *arp_wait_packet_ethaddr;
38int arp_wait_tx_packet_size;
39ulong arp_wait_timer_start;
40int arp_wait_try;
Joe Hershbergerac3f26c2018-09-26 16:49:02 -050041uchar *arp_tx_packet; /* THE ARP transmit packet */
Joe Hershberger85d25e02015-04-08 01:41:08 -050042static uchar arp_tx_packet_buf[PKTSIZE_ALIGN + PKTALIGN];
Joe Hershbergere94070c2012-05-23 07:59:24 +000043
Joe Hershberger85d25e02015-04-08 01:41:08 -050044void arp_init(void)
Joe Hershbergerd280d3f2012-05-23 07:58:01 +000045{
46 /* XXX problem with bss workaround */
Joe Hershberger85d25e02015-04-08 01:41:08 -050047 arp_wait_packet_ethaddr = NULL;
Joe Hershberger049a95a2015-04-08 01:41:01 -050048 net_arp_wait_packet_ip.s_addr = 0;
49 net_arp_wait_reply_ip.s_addr = 0;
Joe Hershberger85d25e02015-04-08 01:41:08 -050050 arp_wait_tx_packet_size = 0;
51 arp_tx_packet = &arp_tx_packet_buf[0] + (PKTALIGN - 1);
52 arp_tx_packet -= (ulong)arp_tx_packet % PKTALIGN;
Joe Hershbergerd280d3f2012-05-23 07:58:01 +000053}
54
Joe Hershberger85d25e02015-04-08 01:41:08 -050055void arp_raw_request(struct in_addr source_ip, const uchar *target_ethaddr,
Joe Hershberger049a95a2015-04-08 01:41:01 -050056 struct in_addr target_ip)
Joe Hershbergerd280d3f2012-05-23 07:58:01 +000057{
58 uchar *pkt;
Joe Hershberger738853b2012-05-23 07:58:08 +000059 struct arp_hdr *arp;
Joe Hershberger00f33262012-05-23 07:59:09 +000060 int eth_hdr_size;
Joe Hershbergerd280d3f2012-05-23 07:58:01 +000061
Joe Hershberger85d25e02015-04-08 01:41:08 -050062 debug_cond(DEBUG_DEV_PKT, "ARP broadcast %d\n", arp_wait_try);
Joe Hershbergerd280d3f2012-05-23 07:58:01 +000063
Joe Hershberger85d25e02015-04-08 01:41:08 -050064 pkt = arp_tx_packet;
Joe Hershbergerd280d3f2012-05-23 07:58:01 +000065
Joe Hershberger1203fcc2015-04-08 01:41:05 -050066 eth_hdr_size = net_set_ether(pkt, net_bcast_ethaddr, PROT_ARP);
Joe Hershberger00f33262012-05-23 07:59:09 +000067 pkt += eth_hdr_size;
Joe Hershbergerd280d3f2012-05-23 07:58:01 +000068
Joe Hershberger85d25e02015-04-08 01:41:08 -050069 arp = (struct arp_hdr *)pkt;
Joe Hershbergerd280d3f2012-05-23 07:58:01 +000070
71 arp->ar_hrd = htons(ARP_ETHER);
72 arp->ar_pro = htons(PROT_IP);
Joe Hershberger674bb242012-05-23 07:58:17 +000073 arp->ar_hln = ARP_HLEN;
74 arp->ar_pln = ARP_PLEN;
Joe Hershbergerd280d3f2012-05-23 07:58:01 +000075 arp->ar_op = htons(ARPOP_REQUEST);
76
Joe Hershberger0adb5b72015-04-08 01:41:04 -050077 memcpy(&arp->ar_sha, net_ethaddr, ARP_HLEN); /* source ET addr */
Joe Hershberger049a95a2015-04-08 01:41:01 -050078 net_write_ip(&arp->ar_spa, source_ip); /* source IP addr */
Joe Hershberger85d25e02015-04-08 01:41:08 -050079 memcpy(&arp->ar_tha, target_ethaddr, ARP_HLEN); /* target ET addr */
Joe Hershberger049a95a2015-04-08 01:41:01 -050080 net_write_ip(&arp->ar_tpa, target_ip); /* target IP addr */
Joe Hershberger22804182012-05-23 08:00:11 +000081
Joe Hershberger85d25e02015-04-08 01:41:08 -050082 net_send_packet(arp_tx_packet, eth_hdr_size + ARP_HDR_SIZE);
Joe Hershberger22804182012-05-23 08:00:11 +000083}
84
Joe Hershberger85d25e02015-04-08 01:41:08 -050085void arp_request(void)
Joe Hershberger22804182012-05-23 08:00:11 +000086{
Joe Hershberger049a95a2015-04-08 01:41:01 -050087 if ((net_arp_wait_packet_ip.s_addr & net_netmask.s_addr) !=
88 (net_ip.s_addr & net_netmask.s_addr)) {
89 if (net_gateway.s_addr == 0) {
Joe Hershbergerd280d3f2012-05-23 07:58:01 +000090 puts("## Warning: gatewayip needed but not set\n");
Joe Hershberger049a95a2015-04-08 01:41:01 -050091 net_arp_wait_reply_ip = net_arp_wait_packet_ip;
Joe Hershbergerd280d3f2012-05-23 07:58:01 +000092 } else {
Joe Hershberger049a95a2015-04-08 01:41:01 -050093 net_arp_wait_reply_ip = net_gateway;
Joe Hershbergerd280d3f2012-05-23 07:58:01 +000094 }
95 } else {
Joe Hershberger049a95a2015-04-08 01:41:01 -050096 net_arp_wait_reply_ip = net_arp_wait_packet_ip;
Joe Hershbergerd280d3f2012-05-23 07:58:01 +000097 }
98
Joe Hershberger0adb5b72015-04-08 01:41:04 -050099 arp_raw_request(net_ip, net_null_ethaddr, net_arp_wait_reply_ip);
Joe Hershbergerd280d3f2012-05-23 07:58:01 +0000100}
101
Stefan BrĂ¼ns45b47732015-08-30 17:46:54 +0200102int arp_timeout_check(void)
Joe Hershbergerd280d3f2012-05-23 07:58:01 +0000103{
104 ulong t;
105
Joe Hershberger3f02c982018-09-26 16:48:58 -0500106 if (!arp_is_waiting())
Stefan BrĂ¼ns45b47732015-08-30 17:46:54 +0200107 return 0;
Joe Hershbergerd280d3f2012-05-23 07:58:01 +0000108
109 t = get_timer(0);
110
111 /* check for arp timeout */
Joe Hershberger85d25e02015-04-08 01:41:08 -0500112 if ((t - arp_wait_timer_start) > ARP_TIMEOUT) {
113 arp_wait_try++;
Joe Hershbergerd280d3f2012-05-23 07:58:01 +0000114
Joe Hershberger85d25e02015-04-08 01:41:08 -0500115 if (arp_wait_try >= ARP_TIMEOUT_COUNT) {
Joe Hershbergerd280d3f2012-05-23 07:58:01 +0000116 puts("\nARP Retry count exceeded; starting again\n");
Joe Hershberger85d25e02015-04-08 01:41:08 -0500117 arp_wait_try = 0;
Stefan BrĂ¼ns94323112015-08-30 17:46:43 +0200118 net_set_state(NETLOOP_FAIL);
Joe Hershbergerd280d3f2012-05-23 07:58:01 +0000119 } else {
Joe Hershberger85d25e02015-04-08 01:41:08 -0500120 arp_wait_timer_start = t;
121 arp_request();
Joe Hershbergerd280d3f2012-05-23 07:58:01 +0000122 }
123 }
Stefan BrĂ¼ns45b47732015-08-30 17:46:54 +0200124 return 1;
Joe Hershbergerd280d3f2012-05-23 07:58:01 +0000125}
126
Joe Hershberger85d25e02015-04-08 01:41:08 -0500127void arp_receive(struct ethernet_hdr *et, struct ip_udp_hdr *ip, int len)
Joe Hershbergerd280d3f2012-05-23 07:58:01 +0000128{
Joe Hershberger738853b2012-05-23 07:58:08 +0000129 struct arp_hdr *arp;
Joe Hershberger049a95a2015-04-08 01:41:01 -0500130 struct in_addr reply_ip_addr;
Joe Hershberger00f33262012-05-23 07:59:09 +0000131 int eth_hdr_size;
Joe Hershbergerac3f26c2018-09-26 16:49:02 -0500132 uchar *tx_packet;
Joe Hershbergerd280d3f2012-05-23 07:58:01 +0000133
134 /*
135 * We have to deal with two types of ARP packets:
136 * - REQUEST packets will be answered by sending our
137 * IP address - if we know it.
138 * - REPLY packates are expected only after we asked
139 * for the TFTP server's or the gateway's ethernet
140 * address; so if we receive such a packet, we set
141 * the server ethernet address
142 */
Joe Hershberger4ef8d532012-05-23 08:01:04 +0000143 debug_cond(DEBUG_NET_PKT, "Got ARP\n");
Joe Hershbergerd280d3f2012-05-23 07:58:01 +0000144
Joe Hershberger738853b2012-05-23 07:58:08 +0000145 arp = (struct arp_hdr *)ip;
Joe Hershbergerd280d3f2012-05-23 07:58:01 +0000146 if (len < ARP_HDR_SIZE) {
147 printf("bad length %d < %d\n", len, ARP_HDR_SIZE);
148 return;
149 }
150 if (ntohs(arp->ar_hrd) != ARP_ETHER)
151 return;
152 if (ntohs(arp->ar_pro) != PROT_IP)
153 return;
Joe Hershberger674bb242012-05-23 07:58:17 +0000154 if (arp->ar_hln != ARP_HLEN)
Joe Hershbergerd280d3f2012-05-23 07:58:01 +0000155 return;
Joe Hershberger674bb242012-05-23 07:58:17 +0000156 if (arp->ar_pln != ARP_PLEN)
Joe Hershbergerd280d3f2012-05-23 07:58:01 +0000157 return;
158
Joe Hershberger049a95a2015-04-08 01:41:01 -0500159 if (net_ip.s_addr == 0)
Joe Hershbergerd280d3f2012-05-23 07:58:01 +0000160 return;
161
Joe Hershberger049a95a2015-04-08 01:41:01 -0500162 if (net_read_ip(&arp->ar_tpa).s_addr != net_ip.s_addr)
Joe Hershbergerd280d3f2012-05-23 07:58:01 +0000163 return;
164
165 switch (ntohs(arp->ar_op)) {
166 case ARPOP_REQUEST:
167 /* reply with our IP address */
Joe Hershberger4ef8d532012-05-23 08:01:04 +0000168 debug_cond(DEBUG_DEV_PKT, "Got ARP REQUEST, return our IP\n");
Joe Hershbergere7111012012-05-23 07:59:16 +0000169 eth_hdr_size = net_update_ether(et, et->et_src, PROT_ARP);
Joe Hershbergerd280d3f2012-05-23 07:58:01 +0000170 arp->ar_op = htons(ARPOP_REPLY);
Joe Hershberger674bb242012-05-23 07:58:17 +0000171 memcpy(&arp->ar_tha, &arp->ar_sha, ARP_HLEN);
Joe Hershberger049a95a2015-04-08 01:41:01 -0500172 net_copy_ip(&arp->ar_tpa, &arp->ar_spa);
Joe Hershberger0adb5b72015-04-08 01:41:04 -0500173 memcpy(&arp->ar_sha, net_ethaddr, ARP_HLEN);
Joe Hershberger049a95a2015-04-08 01:41:01 -0500174 net_copy_ip(&arp->ar_spa, &net_ip);
Joe Hershbergerc6975762012-05-23 08:00:13 +0000175
176#ifdef CONFIG_CMD_LINK_LOCAL
177 /*
178 * Work-around for brain-damaged Cisco equipment with
179 * arp-proxy enabled.
180 *
181 * If the requesting IP is not on our subnet, wait 5ms to
182 * reply to ARP request so that our reply will overwrite
183 * the arp-proxy's instead of the other way around.
184 */
Joe Hershberger049a95a2015-04-08 01:41:01 -0500185 if ((net_read_ip(&arp->ar_tpa).s_addr & net_netmask.s_addr) !=
186 (net_read_ip(&arp->ar_spa).s_addr & net_netmask.s_addr))
Joe Hershbergerc6975762012-05-23 08:00:13 +0000187 udelay(5000);
188#endif
Joe Hershbergerac3f26c2018-09-26 16:49:02 -0500189 tx_packet = net_get_async_tx_pkt_buf();
190 memcpy(tx_packet, et, eth_hdr_size + ARP_HDR_SIZE);
191 net_send_packet(tx_packet, eth_hdr_size + ARP_HDR_SIZE);
Joe Hershbergerd280d3f2012-05-23 07:58:01 +0000192 return;
193
194 case ARPOP_REPLY: /* arp reply */
Joe Hershberger3f02c982018-09-26 16:48:58 -0500195 /* are we waiting for a reply? */
196 if (!arp_is_waiting())
Joe Hershbergerd280d3f2012-05-23 07:58:01 +0000197 break;
198
Simon Glass3df6cd42021-12-18 11:27:48 -0700199 if (IS_ENABLED(CONFIG_KEEP_SERVERADDR) &&
200 net_server_ip.s_addr == net_arp_wait_packet_ip.s_addr) {
Joe Hershbergerd280d3f2012-05-23 07:58:01 +0000201 char buf[20];
Mike Frysingera0bc44e2012-07-10 00:41:50 +0000202 sprintf(buf, "%pM", &arp->ar_sha);
Simon Glass382bee52017-08-03 12:22:09 -0600203 env_set("serveraddr", buf);
Joe Hershbergerd280d3f2012-05-23 07:58:01 +0000204 }
Joe Hershbergerd280d3f2012-05-23 07:58:01 +0000205
Joe Hershberger049a95a2015-04-08 01:41:01 -0500206 reply_ip_addr = net_read_ip(&arp->ar_spa);
Joe Hershbergerd280d3f2012-05-23 07:58:01 +0000207
208 /* matched waiting packet's address */
Joe Hershberger049a95a2015-04-08 01:41:01 -0500209 if (reply_ip_addr.s_addr == net_arp_wait_reply_ip.s_addr) {
Joe Hershberger4ef8d532012-05-23 08:01:04 +0000210 debug_cond(DEBUG_DEV_PKT,
Joe Hershberger85d25e02015-04-08 01:41:08 -0500211 "Got ARP REPLY, set eth addr (%pM)\n",
212 arp->ar_data);
Joe Hershbergerd280d3f2012-05-23 07:58:01 +0000213
214 /* save address for later use */
Joe Hershberger85d25e02015-04-08 01:41:08 -0500215 if (arp_wait_packet_ethaddr != NULL)
216 memcpy(arp_wait_packet_ethaddr,
Joe Hershbergerf1d2d282012-05-23 07:59:20 +0000217 &arp->ar_sha, ARP_HLEN);
Joe Hershbergerd280d3f2012-05-23 07:58:01 +0000218
Joe Hershbergerece223b2012-05-23 07:59:15 +0000219 net_get_arp_handler()((uchar *)arp, 0, reply_ip_addr,
Joe Hershberger85d25e02015-04-08 01:41:08 -0500220 0, len);
Joe Hershbergerece223b2012-05-23 07:59:15 +0000221
Joe Hershbergere94070c2012-05-23 07:59:24 +0000222 /* set the mac address in the waiting packet's header
223 and transmit it */
Joe Hershberger1203fcc2015-04-08 01:41:05 -0500224 memcpy(((struct ethernet_hdr *)net_tx_packet)->et_dest,
225 &arp->ar_sha, ARP_HLEN);
Joe Hershberger85d25e02015-04-08 01:41:08 -0500226 net_send_packet(net_tx_packet, arp_wait_tx_packet_size);
Joe Hershbergerd280d3f2012-05-23 07:58:01 +0000227
228 /* no arp request pending now */
Joe Hershberger049a95a2015-04-08 01:41:01 -0500229 net_arp_wait_packet_ip.s_addr = 0;
Joe Hershberger85d25e02015-04-08 01:41:08 -0500230 arp_wait_tx_packet_size = 0;
231 arp_wait_packet_ethaddr = NULL;
Joe Hershbergerd280d3f2012-05-23 07:58:01 +0000232 }
233 return;
234 default:
235 debug("Unexpected ARP opcode 0x%x\n",
236 ntohs(arp->ar_op));
237 return;
238 }
239}
Joe Hershberger3f02c982018-09-26 16:48:58 -0500240
241bool arp_is_waiting(void)
242{
243 return !!net_arp_wait_packet_ip.s_addr;
244}