bridge: support for static fdb entries

There is no intuitive option to add static fdb entries today.
'temp' seems to have a side effect of adding
'static' fdb entries. But the name and intent
of 'temp' does not say anything about it being static.

example:
bridge fdb add operates as follows:

$bridge fdb add 00:01:02:03:04:05 dev eth0 master
$bridge fdb add 00:01:02:03:04:06 dev eth0 master temp
$bridge fdb add 00:01:02:03:04:07 dev eth0 master local

$bridge fdb show
00:01:02:03:04:05 dev eth0 permanent
00:01:02:03:04:06 dev eth0 static
00:01:02:03:04:07 dev eth0 permanent
00:01:02:03:04:08 dev eth0 <<== dynamic, ageable learned mac

This patch adds a new bridge fdb type 'static' which
makes sure NUD_NOARP and NUD_REACHABLE is set for static
entries. This effectively is nothing but what 'temp'
does today. But the name 'temp' is misleading.

After the patch:
$bridge fdb add 00:01:02:03:04:06 dev eth0 master static

$bridge fdb show
00:01:02:03:04:06 dev eth0 static

'temp' could ideally be a dynamic mac that can age (ie just
NUD_REACHABLE). But, 'temp' sets 'NUD_NOARP' and 'NUD_REACHABLE'.
Too late to change 'temp' now. But, we are thinking of introduing a
'dynamic' keyword after this patch that only sets NUD_REACHABLE.
Signed-off-by: Wilson Kok <wkok@cumulusnetworks.com>
Signed-off-by: Roopa Prabhu <roopa@cumulusnetworks.com>

bridge/fdb.c

@@ -33,7 +33,7 @@ static void usage(void)
 {
 	fprintf(stderr, "Usage: bridge fdb { add | append | del | replace } ADDR dev DEV\n"
 			"              [ self ] [ master ] [ use ] [ router ]\n"
-			"              [ local | temp ] [ dst IPADDR ] [ vlan VID ]\n"
+			"              [ local | temp | static ] [ dst IPADDR ] [ vlan VID ]\n"
 		        "              [ port PORT] [ vni VNI ] [ via DEV ]\n");
 	fprintf(stderr, "       bridge fdb [ show [ br BRDEV ] [ brport DEV ] ]\n");
 	exit(-1);
@@ -301,7 +301,8 @@ static int fdb_modify(int cmd, int flags, int argc, char **argv)
 		} else if (matches(*argv, "local") == 0||
 			   matches(*argv, "permanent") == 0) {
 			req.ndm.ndm_state |= NUD_PERMANENT;
-		} else if (matches(*argv, "temp") == 0) {
+		} else if (matches(*argv, "temp") == 0 ||
+			   matches(*argv, "static") == 0) {
 			req.ndm.ndm_state |= NUD_REACHABLE;
 		} else if (matches(*argv, "vlan") == 0) {
 			if (vid >= 0)