Add Framed-IP-Address to Accounting-Request if STA address is known

The recently added ProxyARP support (proxy_arp=1) in hostapd allows a
STA IPv4 address to be learned from DHCP or ARP messages. If that
information is available, add it to Account-Request messages in
Framed-IP-Address attribute.

Signed-off-by: Jouni Malinen <j@w1.fi>

src/ap/accounting.c

@@ -1,6 +1,6 @@
 /*
  * hostapd / RADIUS Accounting
- * Copyright (c) 2002-2009, 2012, Jouni Malinen <j@w1.fi>
+ * Copyright (c) 2002-2009, 2012-2015, Jouni Malinen <j@w1.fi>
  *
  * This software may be distributed under the terms of the BSD license.
  * See README for more details.
@@ -147,6 +147,15 @@ static struct radius_msg * accounting_msg(struct hostapd_data *hapd,
 			wpa_printf(MSG_ERROR, "Could not add CUI from ACL");
 			goto fail;
 		}
+
+		if (sta->ipaddr &&
+		    !radius_msg_add_attr_int32(msg,
+					       RADIUS_ATTR_FRAMED_IP_ADDRESS,
+					       be_to_host32(sta->ipaddr))) {
+			wpa_printf(MSG_ERROR,
+				   "Could not add Framed-IP-Address");
+			goto fail;
+		}
 	}
 
 	return msg;

src/radius/radius.c

@@ -1,6 +1,6 @@
 /*
  * RADIUS message processing
- * Copyright (c) 2002-2009, 2011-2014, Jouni Malinen <j@w1.fi>
+ * Copyright (c) 2002-2009, 2011-2015, Jouni Malinen <j@w1.fi>
  *
  * This software may be distributed under the terms of the BSD license.
  * See README for more details.
@@ -173,6 +173,7 @@ static const struct radius_attr_type radius_attrs[] =
 	{ RADIUS_ATTR_USER_PASSWORD, "User-Password", RADIUS_ATTR_UNDIST },
 	{ RADIUS_ATTR_NAS_IP_ADDRESS, "NAS-IP-Address", RADIUS_ATTR_IP },
 	{ RADIUS_ATTR_NAS_PORT, "NAS-Port", RADIUS_ATTR_INT32 },
+	{ RADIUS_ATTR_FRAMED_IP_ADDRESS, "Framed-IP-Address", RADIUS_ATTR_IP },
 	{ RADIUS_ATTR_FRAMED_MTU, "Framed-MTU", RADIUS_ATTR_INT32 },
 	{ RADIUS_ATTR_REPLY_MESSAGE, "Reply-Message", RADIUS_ATTR_TEXT },
 	{ RADIUS_ATTR_STATE, "State", RADIUS_ATTR_UNDIST },

src/radius/radius.h

@@ -1,6 +1,6 @@
 /*
  * RADIUS message processing
- * Copyright (c) 2002-2009, 2012, 2014, Jouni Malinen <j@w1.fi>
+ * Copyright (c) 2002-2009, 2012, 2014-2015, Jouni Malinen <j@w1.fi>
  *
  * This software may be distributed under the terms of the BSD license.
  * See README for more details.
@@ -52,6 +52,7 @@ enum { RADIUS_ATTR_USER_NAME = 1,
        RADIUS_ATTR_USER_PASSWORD = 2,
        RADIUS_ATTR_NAS_IP_ADDRESS = 4,
        RADIUS_ATTR_NAS_PORT = 5,
+       RADIUS_ATTR_FRAMED_IP_ADDRESS = 8,
        RADIUS_ATTR_FRAMED_MTU = 12,
        RADIUS_ATTR_REPLY_MESSAGE = 18,
        RADIUS_ATTR_STATE = 24,