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Lothar Felten authored
Add a new command 'wol': Wait for an incoming Wake-on-LAN packet or time out if no WoL packed is received. If the WoL packet contains a password, it is saved in the environment variable 'wolpassword' using the etherwake format (dot or colon separated decimals). Intended use case: a networked device should boot an alternate image. It's attached to a network on a client site, modifying the DHCP server configuration or setup of a tftp server is not allowed. After power on the device waits a few seconds for a WoL packet. If a packet is received, the device boots the alternate image. Otherwise it boots the default image. This method is a simple way to interact with a system via network even if only the MAC address is known. Tools to send WoL packets are available on all common platforms. Some Ethernet drivers seem to pad the incoming packet. The additional padding bytes might be recognized as Wake-on-LAN password bytes. By default enabled in pengwyn_defconfig. Signed-off-by:
Lothar Felten <lothar.felten@gmail.com> Acked-by:
Joe Hershberger <joe.hershberger@ni.com>
Lothar Felten authoredAdd a new command 'wol': Wait for an incoming Wake-on-LAN packet or time out if no WoL packed is received. If the WoL packet contains a password, it is saved in the environment variable 'wolpassword' using the etherwake format (dot or colon separated decimals). Intended use case: a networked device should boot an alternate image. It's attached to a network on a client site, modifying the DHCP server configuration or setup of a tftp server is not allowed. After power on the device waits a few seconds for a WoL packet. If a packet is received, the device boots the alternate image. Otherwise it boots the default image. This method is a simple way to interact with a system via network even if only the MAC address is known. Tools to send WoL packets are available on all common platforms. Some Ethernet drivers seem to pad the incoming packet. The additional padding bytes might be recognized as Wake-on-LAN password bytes. By default enabled in pengwyn_defconfig. Signed-off-by:
wol.h 1.40 KiB
/* SPDX-License-Identifier: GPL-2.0+ */
/*
* wol - Wake-on-LAN
*
* Supports both Wake-on-LAN packet types:
* - EtherType 0x0842 packets
* - UDP packets on ports 0, 7 and 9.
*
* Copyright 2018 Lothar Felten, lothar.felten@gmail.com
*/
#if defined(CONFIG_CMD_WOL)
#ifndef __WOL_H__
#define __WOL_H__
#include <net.h>
/**********************************************************************/
#define WOL_SYNC_BYTE 0xFF
#define WOL_SYNC_COUNT 6
#define WOL_MAC_REPETITIONS 16
#define WOL_DEFAULT_TIMEOUT 5000
#define WOL_PASSWORD_4B 4
#define WOL_PASSWORD_6B 6
/*
* Wake-on-LAN header
*/
struct wol_hdr {
u8 wol_sync[WOL_SYNC_COUNT]; /* sync bytes */
u8 wol_dest[WOL_MAC_REPETITIONS * ARP_HLEN]; /* 16x MAC */
u8 wol_passwd[0]; /* optional */
};
/*
* Initialize wol (beginning of netloop)
*/
void wol_start(void);
/*
* Check incoming Wake-on-LAN packet for:
* - sync bytes
* - sixteen copies of the target MAC address
*
* Optionally store the four or six byte password in the environment
* variable "wolpassword"
*
* @param ip IP header in the packet
* @param len Packet length
*/
void wol_receive(struct ip_udp_hdr *ip, unsigned int len);
/*
* Set the timeout for the reception of a Wake-on-LAN packet
*
* @param timeout in milliseconds
*/
void wol_set_timeout(ulong timeout);
/**********************************************************************/
#endif /* __WOL_H__ */
#endif