dccp: Upgrade NDP count from 3 to 6 bytes

RFC 4340, 7.7 specifies up to 6 bytes for the NDP Count option, whereas the code
is currently limited to up to 3 bytes. This seems to be a relict of an earlier 
draft version and is brought up to date by the patch.

Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>
diff --git a/include/linux/dccp.h b/include/linux/dccp.h
index aa07370..6080449 100644
--- a/include/linux/dccp.h
+++ b/include/linux/dccp.h
@@ -364,8 +364,6 @@
 /* FIXME: for now we're default to 1 but it should really be 0 */
 #define DCCPF_INITIAL_SEND_NDP_COUNT		1
 
-#define DCCP_NDP_LIMIT 0xFFFFFF
-
 /**
   * struct dccp_minisock - Minimal DCCP connection representation
   *
@@ -437,7 +435,7 @@
 			      struct sk_buff *skb);
 
 struct dccp_options_received {
-	u32	dccpor_ndp; /* only 24 bits */
+	u64	dccpor_ndp:48;
 	u32	dccpor_timestamp;
 	u32	dccpor_timestamp_echo;
 	u32	dccpor_elapsed_time;
@@ -533,7 +531,7 @@
 	__u16				dccps_r_ack_ratio;
 	__u16				dccps_pcslen;
 	__u16				dccps_pcrlen;
-	unsigned long			dccps_ndp_count;
+	__u64				dccps_ndp_count:48;
 	unsigned long			dccps_rate_last;
 	struct dccp_minisock		dccps_minisock;
 	struct dccp_ackvec		*dccps_hc_rx_ackvec;