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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright 2018 Lothar Felten, lothar.felten@gmail.com
*/
#include <command.h>
#include <env.h>
#include <net.h>
#include "wol.h"
static ulong wol_timeout = WOL_DEFAULT_TIMEOUT;
/*
* Check incoming Wake-on-LAN packet for:
* - sync bytes
* - sixteen copies of the target MAC address
*
* @param wol Wake-on-LAN packet
* @param len Packet length
*/
static int wol_check_magic(struct wol_hdr *wol, unsigned int len)
{
int i;
if (len < sizeof(struct wol_hdr))
return 0;
for (i = 0; i < WOL_SYNC_COUNT; i++)
if (wol->wol_sync[i] != WOL_SYNC_BYTE)
return 0;
for (i = 0; i < WOL_MAC_REPETITIONS; i++)
if (memcmp(&wol->wol_dest[i * ARP_HLEN],
net_ethaddr, ARP_HLEN) != 0)
return 0;
return 1;
}
void wol_receive(struct ip_udp_hdr *ip, unsigned int len)
{
struct wol_hdr *wol;
wol = (struct wol_hdr *)ip;
if (!wol_check_magic(wol, len))
return;
/* save the optional password using the ether-wake formats */
/* don't check for exact length, the packet might have padding */
if (len >= (sizeof(struct wol_hdr) + WOL_PASSWORD_6B)) {
eth_env_set_enetaddr("wolpassword", wol->wol_passwd);
} else if (len >= (sizeof(struct wol_hdr) + WOL_PASSWORD_4B)) {
char buffer[16];
struct in_addr *ip = (struct in_addr *)(wol->wol_passwd);
ip_to_string(*ip, buffer);
env_set("wolpassword", buffer);
}
net_set_state(NETLOOP_SUCCESS);
}
static void wol_udp_handler(uchar *pkt, unsigned int dest, struct in_addr sip,
unsigned int src, unsigned int len)
{
struct wol_hdr *wol;
wol = (struct wol_hdr *)pkt;
/* UDP destination port must be 0, 7 or 9 */
if (dest != 0 && dest != 7 && dest != 9)
return;
if (!wol_check_magic(wol, len))
return;
net_set_state(NETLOOP_SUCCESS);
}
void wol_set_timeout(ulong timeout)
{
wol_timeout = timeout;
}
static void wol_timeout_handler(void)
{
eth_halt();
net_set_state(NETLOOP_FAIL);
}
void wol_start(void)
{
net_set_timeout_handler(wol_timeout, wol_timeout_handler);
net_set_udp_handler(wol_udp_handler);
}
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