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bgpd: support for filtering EVPN routes based on route-types.

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In many situations, it is desirable to only exchange EVPN routes of a particular type.
For e.g., a common deployment scenario for large DCs
is to sub-divide the DC into multiple PODs with full host mobility within a POD
(i.e., all subnets provisioned on all leaf switches within the POD)
but only do prefix-based routing across PODs.
This can be achieved by only exchanging EVPN type-5 routes across PODs.

Implement a policy to filter EVPN routes based on route type.

Ticket: CM-19394
Review: CCR-7139
Testing: Manual

Signed-off-by: Mitesh Kanjariya <mitesh@cumulusnetworks.com>
This commit is contained in:
Mitesh Kanjariya 2018-01-26 17:16:48 -08:00 committed by mitesh
parent 643215ce4c
commit 33c2ff625e
1 changed files with 85 additions and 0 deletions
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85
bgpd/bgp_routemap.c
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@ -696,6 +696,58 @@ struct route_map_rule_cmd route_match_evpn_vni_cmd = {
"evpn vni", route_match_vni, route_match_vni_compile,
route_match_vni_free};
/* `match evpn route-type' */
/* Match function should return 1 if match is success else return
zero. */
static route_map_result_t route_match_evpn_route_type(void *rule,
struct prefix *prefix,
route_map_object_t type,
void *object)
{
u_char route_type = 0;
if (type == RMAP_BGP) {
route_type = *((u_char *)rule);
if (route_type == prefix->u.prefix_evpn.route_type)
return RMAP_MATCH;
}
return RMAP_NOMATCH;
}
/* Route map `route-type' match statement. */
static void *route_match_evpn_route_type_compile(const char *arg)
{
u_char *route_type = NULL;
route_type = XMALLOC(MTYPE_ROUTE_MAP_COMPILED, sizeof(u_char));
if (!route_type)
return NULL;
if (strncmp(arg, "ma", 2) == 0)
*route_type = BGP_EVPN_MAC_IP_ROUTE;
else if (strncmp(arg, "mu", 2) == 0)
*route_type = BGP_EVPN_IMET_ROUTE;
else
*route_type = BGP_EVPN_IP_PREFIX_ROUTE;
return route_type;
}
/* Free route map's compiled `route-type' value. */
static void route_match_evpn_route_type_free(void *rule)
{
XFREE(MTYPE_ROUTE_MAP_COMPILED, rule);
}
/* Route map commands for evpn route-type matching. */
struct route_map_rule_cmd route_match_evpn_route_type_cmd = {
"evpn route-type", route_match_evpn_route_type,
route_match_evpn_route_type_compile,
route_match_evpn_route_type_free};
/* `match local-preference LOCAL-PREF' */
/* Match function return 1 if match is success else return zero. */
@ -3132,6 +3184,36 @@ DEFUN (no_match_mac_address,
RMAP_EVENT_FILTER_DELETED);
}
DEFUN (match_evpn_route_type,
match_evpn_route_type_cmd,
"match evpn route-type {macip | multicast | prefix}",
MATCH_STR
EVPN_HELP_STR
"Match route-type\n"
"mac-ip route\n"
"IMET route\n"
"prefix route\n")
{
return bgp_route_match_add(vty, "evpn route-type", argv[3]->arg,
RMAP_EVENT_MATCH_ADDED);
}
DEFUN (no_match_evpn_route_type,
no_match_evpn_route_type_cmd,
"no match evpn route-type {macip | multicast | prefix}",
NO_STR
MATCH_STR
EVPN_HELP_STR
"Match route-type\n"
"mac-ip route\n"
"IMET route\n"
"prefix route\n")
{
return bgp_route_match_delete(vty, "evpn route-type", argv[4]->arg,
RMAP_EVENT_MATCH_DELETED);
}
DEFUN (match_evpn_vni,
match_evpn_vni_cmd,
"match evpn vni (1-16777215)",
@ -4534,6 +4616,7 @@ void bgp_route_map_init(void)
route_map_install_match(&route_match_tag_cmd);
route_map_install_match(&route_match_mac_address_cmd);
route_map_install_match(&route_match_evpn_vni_cmd);
route_map_install_match(&route_match_evpn_route_type_cmd);
route_map_install_set(&route_set_ip_nexthop_cmd);
route_map_install_set(&route_set_local_pref_cmd);
@ -4568,6 +4651,8 @@ void bgp_route_map_init(void)
install_element(RMAP_NODE, &no_match_mac_address_cmd);
install_element(RMAP_NODE, &match_evpn_vni_cmd);
install_element(RMAP_NODE, &no_match_evpn_vni_cmd);
install_element(RMAP_NODE, &match_evpn_route_type_cmd);
install_element(RMAP_NODE, &no_match_evpn_route_type_cmd);
install_element(RMAP_NODE, &match_aspath_cmd);
install_element(RMAP_NODE, &no_match_aspath_cmd);