Eric Lee / smarc-uboot

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net/wol.c 2.03 KB
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d8970dae2   Lothar Felten   net: Add new wol ... 
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  // SPDX-License-Identifier: GPL-2.0+
  /*
   * Copyright 2018 Lothar Felten, lothar.felten@gmail.com
   */
  
  #include <common.h>
  #include <command.h>
  #include <net.h>
  #include <environment.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);
  }