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