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@@ -0,0 +1,96 @@
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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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+
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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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+
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+static ulong wol_timeout = WOL_DEFAULT_TIMEOUT;
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+
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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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+
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+ if (len < sizeof(struct wol_hdr))
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+ return 0;
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+
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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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+
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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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+
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+ return 1;
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+}
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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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+
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+ wol = (struct wol_hdr *)ip;
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+
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+ if (!wol_check_magic(wol, len))
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+ return;
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+
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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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+
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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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+
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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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+
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+ wol = (struct wol_hdr *)pkt;
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+
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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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+
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+ if (!wol_check_magic(wol, len))
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+ return;
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+
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+ net_set_state(NETLOOP_SUCCESS);
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+}
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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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+
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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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+
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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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