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// SPDX-License-Identifier: GPL-2.0+
/* Copyright (C) 2024 Linaro Ltd. */
#include <command.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <lwip/dhcp.h>
#include <lwip/dns.h>
#include <lwip/timeouts.h>
#include <net-lwip.h>
#include <time.h>
#define DHCP_TIMEOUT_MS 2000
#ifdef CONFIG_CMD_TFTPBOOT
/* Boot file obtained from DHCP (if present) */
static char boot_file_name[DHCP_BOOT_FILE_LEN];
#endif
static void call_lwip_dhcp_fine_tmr(void *ctx)
{
dhcp_fine_tmr();
}
int do_dhcp(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
{
unsigned long start;
struct netif *netif;
struct dhcp *dhcp;
bool bound;
/* Running DHCP on the primary interface only */
if (eth_get_dev_index() != 0)
return -EINVAL;
net_lwip_init();
netif = net_lwip_get_netif();
if (!netif)
return CMD_RET_FAILURE;
/*
* The fine timer is half a second, it deals with the initial DHCP
* request.
* We don't bother with the coarse timer (1 minute) which handles the
* DHCP lease renewal.
*/
sys_timeout(500, call_lwip_dhcp_fine_tmr, NULL);
start = get_timer(0);
dhcp_start(netif);
/* Wait for DHCP to complete */
do {
eth_rx();
sys_check_timeouts();
bound = dhcp_supplied_address(netif);
if (bound)
break;
} while (get_timer(start) < DHCP_TIMEOUT_MS);
sys_untimeout(call_lwip_dhcp_fine_tmr, NULL);
if (!bound)
return CMD_RET_FAILURE;
dhcp = netif_dhcp_data(netif);
env_set("bootfile", dhcp->boot_file_name);
if (dhcp->offered_gw_addr.addr != 0) {
env_set("gatewayip", ip4addr_ntoa(&dhcp->offered_gw_addr));
/* Set this interface as the default for IP routing */
netif_set_default(netif);
}
env_set("ipaddr", ip4addr_ntoa(&dhcp->offered_ip_addr));
env_set("netmask", ip4addr_ntoa(&dhcp->offered_sn_mask));
env_set("serverip", ip4addr_ntoa(&dhcp->server_ip_addr));
#ifdef CONFIG_PROT_DNS_LWIP
env_set("dnsip", ip4addr_ntoa(dns_getserver(0)));
env_set("dnsip2", ip4addr_ntoa(dns_getserver(1)));
#endif
#ifdef CONFIG_CMD_TFTPBOOT
if (dhcp->boot_file_name[0] != '\0')
strncpy(boot_file_name, dhcp->boot_file_name,
sizeof(boot_file_name));
#endif
printf("DHCP client bound to address %pI4 (%lu ms)\n",
&dhcp->offered_ip_addr, get_timer(start));
return CMD_RET_SUCCESS;
}
int dhcp_run(ulong addr, const char *fname, bool autoload)
{
char *dhcp_argv[] = {"dhcp", NULL, };
struct cmd_tbl cmdtp = {}; /* dummy */
if (autoload) {
/* Will be supported when TFTP is added */
return -EOPNOTSUPP;
}
return do_dhcp(&cmdtp, 0, 1, dhcp_argv);
}
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