*: Port Christians tweaks for 32-bit route tags

Port over Christian's tweaks from his port of my commit widening the
route-tag field width to 32-bit.  Commit dc9ffce8786844
 "*: Consistently support 32-bit route tags".

with "changes which make this actually useful for all the daemons".

This is missing the zebra route-map changes.
diff --git a/ripd/rip_routemap.c b/ripd/rip_routemap.c
index 20d3e6e..4e73694 100644
--- a/ripd/rip_routemap.c
+++ b/ripd/rip_routemap.c
@@ -480,45 +480,13 @@
   return RMAP_NOMATCH;
 }
 
-/* Route map `match tag' match statement. `arg' is TAG value */
-static void *
-route_match_tag_compile (const char *arg)
-{
-  route_tag_t *tag;
-  route_tag_t tmp;
-
-  /* tag value shoud be integer. */
-  if (! all_digit (arg))
-    return NULL;
-
-  tmp = atoi(arg);
-  if (tmp < 1)
-    return NULL;
-
-  tag = XMALLOC (MTYPE_ROUTE_MAP_COMPILED, sizeof (u_short));
-
-  if (!tag)
-    return tag;
-
-  *tag = tmp;
-
-  return tag;
-}
-
-/* Free route map's compiled `match tag' value. */
-static void
-route_match_tag_free (void *rule)
-{
-  XFREE (MTYPE_ROUTE_MAP_COMPILED, rule);
-}
-
 /* Route map commands for tag matching. */
-struct route_map_rule_cmd route_match_tag_cmd =
+static struct route_map_rule_cmd route_match_tag_cmd =
 {
   "tag",
   route_match_tag,
-  route_match_tag_compile,
-  route_match_tag_free
+  route_map_rule_tag_compile,
+  route_map_rule_tag_free,
 };
 
 /* `set metric METRIC' */
@@ -703,33 +671,13 @@
   return RMAP_OKAY;
 }
 
-/* Route map `tag' compile function.  Given string is converted
-   to u_short. */
-static void *
-route_set_tag_compile (const char *arg)
-{
-  route_tag_t *tag;
-
-  tag = XMALLOC (MTYPE_ROUTE_MAP_COMPILED, sizeof (u_short));
-  *tag = atoi (arg);
-
-  return tag;
-}
-
-/* Free route map's compiled `ip nexthop' value. */
-static void
-route_set_tag_free (void *rule)
-{
-  XFREE (MTYPE_ROUTE_MAP_COMPILED, rule);
-}
-
 /* Route map commands for tag set. */
 static struct route_map_rule_cmd route_set_tag_cmd =
 {
   "tag",
   route_set_tag,
-  route_set_tag_compile,
-  route_set_tag_free
+  route_map_rule_tag_compile,
+  route_map_rule_tag_free
 };
 
 #define MATCH_STR "Match values from routing table\n"
@@ -950,7 +898,7 @@
 
 DEFUN (match_tag, 
        match_tag_cmd,
-       "match tag <1-65535>",
+       "match tag <1-4294967295>",
        MATCH_STR
        "Match tag of route\n"
        "Metric value\n")
@@ -973,7 +921,7 @@
 
 ALIAS (no_match_tag,
        no_match_tag_val_cmd,
-       "no match tag <1-65535>",
+       "no match tag <1-4294967295>",
        NO_STR
        MATCH_STR
        "Match tag of route\n"
@@ -1073,7 +1021,7 @@
 
 DEFUN (set_tag,
        set_tag_cmd,
-       "set tag <1-65535>",
+       "set tag <1-4294967295>",
        SET_STR
        "Tag value for routing protocol\n"
        "Tag value\n")
@@ -1096,7 +1044,7 @@
 
 ALIAS (no_set_tag,
        no_set_tag_val_cmd,
-       "no set tag <1-65535>",
+       "no set tag <1-4294967295>",
        NO_STR
        SET_STR
        "Tag value for routing protocol\n"
diff --git a/ripd/ripd.h b/ripd/ripd.h
index 5e87fcd..9dba1a5 100644
--- a/ripd/ripd.h
+++ b/ripd/ripd.h
@@ -223,7 +223,7 @@
   struct in_addr nexthop_out;
   u_char metric_set;
   u_int32_t metric_out;
-  u_short tag_out;
+  u_int16_t tag_out;
   ifindex_t ifindex_out;
 
   struct route_node *rp;