bgpd: implement 'match probability' in route-maps
New clause 'match probability <percentage value>'
was added in route-maps (bgpd/bgp_routemap.c modified).
diff --git a/bgpd/bgp_routemap.c b/bgpd/bgp_routemap.c
index 81ff48d..173bf93 100644
--- a/bgpd/bgp_routemap.c
+++ b/bgpd/bgp_routemap.c
@@ -790,6 +790,75 @@
route_match_origin_compile,
route_match_origin_free
};
+
+/* match probability { */
+
+static route_map_result_t
+route_match_probability (void *rule, struct prefix *prefix,
+ route_map_object_t type, void *object)
+{
+ long r;
+#if _SVID_SOURCE || _BSD_SOURCE || _XOPEN_SOURCE >= 500
+ r = random();
+#else
+ r = (long) rand();
+#endif
+
+ switch (*(unsigned *) rule)
+ {
+ case 0: break;
+ case RAND_MAX: return RMAP_MATCH;
+ default:
+ if (r < *(unsigned *) rule)
+ {
+ return RMAP_MATCH;
+ }
+ }
+
+ return RMAP_NOMATCH;
+}
+
+static void *
+route_match_probability_compile (const char *arg)
+{
+ unsigned *lobule;
+ unsigned perc;
+
+#if _SVID_SOURCE || _BSD_SOURCE || _XOPEN_SOURCE >= 500
+ srandom (time (NULL));
+#else
+ srand (time (NULL));
+#endif
+
+ perc = atoi (arg);
+ lobule = XMALLOC (MTYPE_ROUTE_MAP_COMPILED, sizeof (unsigned));
+
+ switch (perc)
+ {
+ case 0: *lobule = 0; break;
+ case 100: *lobule = RAND_MAX; break;
+ default: *lobule = RAND_MAX / 100 * perc;
+ }
+
+ return lobule;
+}
+
+static void
+route_match_probability_free (void *rule)
+{
+ XFREE (MTYPE_ROUTE_MAP_COMPILED, rule);
+}
+
+struct route_map_rule_cmd route_match_probability_cmd =
+{
+ "probability",
+ route_match_probability,
+ route_match_probability_compile,
+ route_match_probability_free
+};
+
+/* } */
+
/* `set ip next-hop IP_ADDRESS' */
/* Set nexthop to object. ojbect must be pointer to struct attr. */
@@ -2444,6 +2513,38 @@
"IP access-list number (expanded range)\n"
"IP Access-list name\n")
+/* match probability { */
+
+DEFUN (match_probability,
+ match_probability_cmd,
+ "match probability <0-100>",
+ MATCH_STR
+ "Match portion of routes defined by percentage value\n"
+ "Percentage of routes\n")
+{
+ return bgp_route_match_add (vty, vty->index, "probability", argv[0]);
+}
+
+DEFUN (no_match_probability,
+ no_match_probability_cmd,
+ "no match probability",
+ NO_STR
+ MATCH_STR
+ "Match portion of routes defined by percentage value\n")
+{
+ return bgp_route_match_delete (vty, vty->index, "probability", argc ? argv[0] : NULL);
+}
+
+ALIAS (no_match_probability,
+ no_match_probability_val_cmd,
+ "no match probability <1-99>",
+ NO_STR
+ MATCH_STR
+ "Match portion of routes defined by percentage value\n"
+ "Percentage of routes\n")
+
+/* } */
+
DEFUN (match_ip_route_source,
match_ip_route_source_cmd,
"match ip route-source (<1-199>|<1300-2699>|WORD)",
@@ -3731,6 +3832,7 @@
route_map_install_match (&route_match_ecommunity_cmd);
route_map_install_match (&route_match_metric_cmd);
route_map_install_match (&route_match_origin_cmd);
+ route_map_install_match (&route_match_probability_cmd);
route_map_install_set (&route_set_ip_nexthop_cmd);
route_map_install_set (&route_set_local_pref_cmd);
@@ -3762,7 +3864,6 @@
install_element (RMAP_NODE, &match_ip_route_source_cmd);
install_element (RMAP_NODE, &no_match_ip_route_source_cmd);
install_element (RMAP_NODE, &no_match_ip_route_source_val_cmd);
-
install_element (RMAP_NODE, &match_ip_address_prefix_list_cmd);
install_element (RMAP_NODE, &no_match_ip_address_prefix_list_cmd);
install_element (RMAP_NODE, &no_match_ip_address_prefix_list_val_cmd);
@@ -3790,6 +3891,9 @@
install_element (RMAP_NODE, &match_origin_cmd);
install_element (RMAP_NODE, &no_match_origin_cmd);
install_element (RMAP_NODE, &no_match_origin_val_cmd);
+ install_element (RMAP_NODE, &match_probability_cmd);
+ install_element (RMAP_NODE, &no_match_probability_cmd);
+ install_element (RMAP_NODE, &no_match_probability_val_cmd);
install_element (RMAP_NODE, &set_ip_nexthop_cmd);
install_element (RMAP_NODE, &set_ip_nexthop_peer_cmd);