1 files changed, 96 insertions, 0 deletions
diff --git a/net/wol.c b/net/wol.c
new file mode 100644
index 0000000000..946bd91b47
--- /dev/null
+++ b/net/wol.c
@@ -0,0 +1,96 @@
+// 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);
+}