carl9170 firmware: Wake-on-LAN support

[carl9170fw.git] / carlfw / src / wlan.c

diff --git a/carlfw/src/wlan.c b/carlfw/src/wlan.c
index 794aa86f44ba9d29a37a7209f514c054cc4be038..9eb336a267eee7c4858d1e057e18358cede4b7c8 100644 (file)
--- a/carlfw/src/wlan.c
+++ b/carlfw/src/wlan.c
@@ -31,6 +31,7 @@
 #include "printf.h"
 #include "rf.h"
 #include "linux/ieee80211.h"
+#include "rom.h"
 
 static void wlan_txunstuck(unsigned int queue)
 {
@@ -629,6 +630,83 @@ static void wlan_check_rx_overrun(void)
        }
 }
 
+#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 */
+
 static unsigned int wlan_rx_filter(struct dma_desc *desc)
 {
        struct ieee80211_hdr *hdr;
@@ -683,6 +761,14 @@ static unsigned int wlan_rx_filter(struct dma_desc *desc)
                rx_filter |= CARL9170_RX_FILTER_MGMT;
        }
 
+#ifdef CONFIG_CARL9170FW_WOL
+       if (unlikely(fw.suspend_mode == CARL9170_HOST_SUSPENDED)) {
+               if (rx_filter & CARL9170_RX_FILTER_DATA)
+                       wlan_rx_wol(hdr, min(data_len,
+                                   (unsigned int)AR9170_BLOCK_SIZE));
+       }
+#endif /* CONFIG_CARL9170FW_WOL */
+
 #undef AR9170_RX_ERROR_BAD
 
        return rx_filter;