[NET]: Introduce RTA_TABLE/FRA_TABLE attributes

Introduce RTA_TABLE route attribute and FRA_TABLE routing rule attribute
to hold 32 bit routing table IDs. Usespace compatibility is provided by
continuing to accept and send the rtm_table field, but because of its
limited size it can only carry the low 8 bits of the table ID. This
implies that if larger IDs are used, _all_ userspace programs using them
need to use RTA_TABLE.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/core/fib_rules.c b/net/core/fib_rules.c
index 6cdad24..873b04d 100644
--- a/net/core/fib_rules.c
+++ b/net/core/fib_rules.c
@@ -187,7 +187,7 @@
 
 	rule->action = frh->action;
 	rule->flags = frh->flags;
-	rule->table = frh->table;
+	rule->table = frh_get_table(frh, tb);
 
 	if (!rule->pref && ops->default_pref)
 		rule->pref = ops->default_pref();
@@ -245,7 +245,7 @@
 		if (frh->action && (frh->action != rule->action))
 			continue;
 
-		if (frh->table && (frh->table != rule->table))
+		if (frh->table && (frh_get_table(frh, tb) != rule->table))
 			continue;
 
 		if (tb[FRA_PRIORITY] &&
@@ -291,6 +291,7 @@
 
 	frh = nlmsg_data(nlh);
 	frh->table = rule->table;
+	NLA_PUT_U32(skb, FRA_TABLE, rule->table);
 	frh->res1 = 0;
 	frh->res2 = 0;
 	frh->action = rule->action;