+#ifdef CONFIG_CARL9170FW_WOL
+static void wlan_rx_wol(struct ieee80211_hdr *hdr, unsigned int len)
+{
+ const unsigned char *data, *end, *mac;
+ unsigned int found = 0;
+
+ /*
+ * LIMITATION:
+ * We can only scan the first AR9170_BLOCK_SIZE [=~320] bytes
+ * for MAGIC patterns!
+ */
+
+ /*
+ * TODO:
+ * Currently, the MAGIC MAC Address is fixed to the EEPROM default.
+ * It's possible to make it fully configurable, e.g:
+ *
+ * mac = (const unsigned char *) AR9170_MAC_REG_MAC_ADDR_L;
+ * But this will clash with the driver's suspend path, because it
+ * needs to reset the registers.
+ */
+ mac = rom.sys.mac_address;
+
+ data = (u8 *)((unsigned long)hdr + ieee80211_hdrlen(hdr->frame_control));
+ end = (u8 *)((unsigned long)hdr + len);
+
+ /*
+ * scan for standard WOL Magic frame
+ *
+ * "A physical WakeOnLAN (Magic Packet) will look like this:
+ * ---------------------------------------------------------------
+ * | Synchronization Stream | Target MAC | Password (optional) |
+ * | 6 octets | 96 octets | 0, 4 or 6 |
+ * ---------------------------------------------------------------
+ *
+ * The Synchronization Stream is defined as 6 bytes of FFh.
+ * The Target MAC block contains 16 duplications of the IEEEaddress
+ * of the target, with no breaks or interruptions.
+ *
+ * The Password field is optional, but if present, contains either
+ * 4 bytes or 6 bytes. The WakeOnLAN dissector was implemented to
+ * dissect the password, if present, according to the command-line
+ * format that ether-wake uses, therefore, if a 4-byte password is
+ * present, it will be dissected as an IPv4 address and if a 6-byte
+ * password is present, it will be dissected as an Ethernet address.
+ *
+ * <http://wiki.wireshark.org/WakeOnLAN>
+ */
+
+ while (data < end) {
+ if (found >= 6) {
+ if (*data == mac[found % 6])
+ found++;
+ else
+ found = 0;
+ }
+
+ /* previous check might reset found counter */
+ if (found < 6) {
+ if (*data == 0xff)
+ found++;
+ else
+ found = 0;
+ }
+
+ if (found == (6 + 16 * 6)) {
+ fw.suspend_mode = CARL9170_AWAKE_HOST;
+ return;
+ }
+
+ data++;
+ }
+
+ return;
+}
+#endif /* CONFIG_CARL9170FW_WOL */
+