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bgpd: implement 'match probability' in route-maps

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New clause 'match probability <percentage value>'
was added in route-maps (bgpd/bgp_routemap.c modified).
This commit is contained in:
Vyacheslav Trushkin 2011-11-22 20:15:10 +04:00 committed by Denis Ovsienko
parent fd31c50bc3
commit 1c8afb7c20
1 changed files with 105 additions and 1 deletions
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106
bgpd/bgp_routemap.c
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@ -790,6 +790,75 @@ struct route_map_rule_cmd route_match_origin_cmd =
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 @@ ALIAS (no_match_ip_next_hop,
"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 @@ bgp_route_map_init (void)
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 @@ bgp_route_map_init (void)
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 @@ bgp_route_map_init (void)
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);