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Merge pull request #13430 from opensourcerouting/feature/rip_allow-ecmp_limit

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ripd: Implement allow-ecmp X command
This commit is contained in:
Donald Sharp 2023-05-11 20:31:46 -04:00 committed by GitHub
parent f1af873fef f21277a38a
commit 907183cb35
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GPG key ID: 4AEE18F83AFDEB23
12 changed files with 176 additions and 24 deletions
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5
doc/user/ripd.rst
View file

@ -159,6 +159,11 @@ RIP Configuration
If `poisoned-reverse` is also set, the router sends the poisoned routes
with highest metric back to the sending router.
.. clicmd:: allow-ecmp [1-MULTIPATH_NUM]
Control how many ECMP paths RIP can inject for the same prefix. If specified
without a number, a maximum is taken (compiled with ``--enable-multipath``).
.. _rip-version-control:
RIP Version Control

42
ripd/rip_cli.c
View file

@ -85,14 +85,33 @@ void cli_show_router_rip(struct vty *vty, const struct lyd_node *dnode,
/*
* XPath: /frr-ripd:ripd/instance/allow-ecmp
*/
DEFPY_YANG (rip_allow_ecmp,
DEFUN_YANG (rip_allow_ecmp,
rip_allow_ecmp_cmd,
"[no] allow-ecmp",
NO_STR
"Allow Equal Cost MultiPath\n")
"allow-ecmp [" CMD_RANGE_STR(1, MULTIPATH_NUM) "]",
"Allow Equal Cost MultiPath\n"
"Number of paths\n")
{
nb_cli_enqueue_change(vty, "./allow-ecmp", NB_OP_MODIFY,
no ? "false" : "true");
int idx_number = 1;
char mpaths[3] = {};
uint32_t paths = MULTIPATH_NUM;
if (argv[idx_number])
paths = strtol(argv[idx_number]->arg, NULL, 10);
snprintf(mpaths, sizeof(mpaths), "%u", paths);
nb_cli_enqueue_change(vty, "./allow-ecmp", NB_OP_MODIFY, mpaths);
return nb_cli_apply_changes(vty, NULL);
}
DEFUN_YANG (no_rip_allow_ecmp,
no_rip_allow_ecmp_cmd,
"no allow-ecmp [" CMD_RANGE_STR(1, MULTIPATH_NUM) "]",
NO_STR
"Allow Equal Cost MultiPath\n"
"Number of paths\n")
{
nb_cli_enqueue_change(vty, "./allow-ecmp", NB_OP_MODIFY, 0);
return nb_cli_apply_changes(vty, NULL);
}
@ -100,10 +119,14 @@ DEFPY_YANG (rip_allow_ecmp,
void cli_show_rip_allow_ecmp(struct vty *vty, const struct lyd_node *dnode,
bool show_defaults)
{
if (!yang_dnode_get_bool(dnode, NULL))
vty_out(vty, " no");
uint8_t paths;
vty_out(vty, " allow-ecmp\n");
paths = yang_dnode_get_uint8(dnode, NULL);
if (!paths)
vty_out(vty, " no allow-ecmp\n");
else
vty_out(vty, " allow-ecmp %d\n", paths);
}
/*
@ -1156,6 +1179,7 @@ void rip_cli_init(void)
install_element(RIP_NODE, &rip_no_distribute_list_cmd);
install_element(RIP_NODE, &rip_allow_ecmp_cmd);
install_element(RIP_NODE, &no_rip_allow_ecmp_cmd);
install_element(RIP_NODE, &rip_default_information_originate_cmd);
install_element(RIP_NODE, &rip_default_metric_cmd);
install_element(RIP_NODE, &no_rip_default_metric_cmd);

8
ripd/rip_nb_config.c
View file

@ -99,9 +99,13 @@ int ripd_instance_allow_ecmp_modify(struct nb_cb_modify_args *args)
return NB_OK;
rip = nb_running_get_entry(args->dnode, NULL, true);
rip->ecmp = yang_dnode_get_bool(args->dnode, NULL);
if (!rip->ecmp)
rip->ecmp = yang_dnode_get_uint8(args->dnode, NULL);
if (!rip->ecmp) {
rip_ecmp_disable(rip);
return NB_OK;
}
rip_ecmp_change(rip);
return NB_OK;
}

11
ripd/rip_zebra.c
View file

@ -20,6 +20,7 @@
/* All information about zebra. */
struct zclient *zclient = NULL;
uint32_t zebra_ecmp_count = MULTIPATH_NUM;
/* Send ECMP routes to zebra. */
static void rip_zebra_ipv4_send(struct rip *rip, struct route_node *rp,
@ -30,7 +31,7 @@ static void rip_zebra_ipv4_send(struct rip *rip, struct route_node *rp,
struct zapi_nexthop *api_nh;
struct listnode *listnode = NULL;
struct rip_info *rinfo = NULL;
int count = 0;
uint32_t count = 0;
memset(&api, 0, sizeof(api));
api.vrf_id = rip->vrf->vrf_id;
@ -39,7 +40,7 @@ static void rip_zebra_ipv4_send(struct rip *rip, struct route_node *rp,
SET_FLAG(api.message, ZAPI_MESSAGE_NEXTHOP);
for (ALL_LIST_ELEMENTS_RO(list, listnode, rinfo)) {
if (count >= MULTIPATH_NUM)
if (count >= zebra_ecmp_count)
break;
api_nh = &api.nexthops[count];
api_nh->vrf_id = rip->vrf->vrf_id;
@ -227,6 +228,11 @@ zclient_handler *const rip_handlers[] = {
[ZEBRA_REDISTRIBUTE_ROUTE_DEL] = rip_zebra_read_route,
};
static void rip_zebra_capabilities(struct zclient_capabilities *cap)
{
zebra_ecmp_count = MIN(cap->ecmp, zebra_ecmp_count);
}
void rip_zclient_init(struct event_loop *master)
{
/* Set default value to the zebra client structure. */
@ -234,6 +240,7 @@ void rip_zclient_init(struct event_loop *master)
array_size(rip_handlers));
zclient_init(zclient, ZEBRA_ROUTE_RIP, 0, &ripd_privs);
zclient->zebra_connected = rip_zebra_connected;
zclient->zebra_capabilities = rip_zebra_capabilities;
}
void rip_zclient_stop(void)

62
ripd/ripd.c
View file

@ -156,7 +156,10 @@ struct rip_info *rip_ecmp_add(struct rip *rip, struct rip_info *rinfo_new)
{
struct route_node *rp = rinfo_new->rp;
struct rip_info *rinfo = NULL;
struct rip_info *rinfo_exist = NULL;
struct list *list = NULL;
struct listnode *node = NULL;
struct listnode *nnode = NULL;
if (rp->info == NULL)
rp->info = list_new();
@ -167,6 +170,33 @@ struct rip_info *rip_ecmp_add(struct rip *rip, struct rip_info *rinfo_new)
if (listcount(list) && !rip->ecmp)
return NULL;
/* Add or replace an existing ECMP path with lower neighbor IP */
if (listcount(list) && listcount(list) >= rip->ecmp) {
struct rip_info *from_highest = NULL;
/* Find the rip_info struct that has the highest nexthop IP */
for (ALL_LIST_ELEMENTS(list, node, nnode, rinfo_exist))
if (!from_highest ||
(from_highest &&
IPV4_ADDR_CMP(&rinfo_exist->from,
&from_highest->from) > 0)) {
from_highest = rinfo_exist;
}
/* If we have a route in ECMP group, delete the old
* one that has a higher next-hop address. Lower IP is
* preferred.
*/
if (rip->ecmp > 1 && from_highest &&
IPV4_ADDR_CMP(&from_highest->from, &rinfo_new->from) > 0) {
rip_ecmp_delete(rip, from_highest);
goto add_or_replace;
}
return NULL;
}
add_or_replace:
rinfo = rip_info_new();
memcpy(rinfo, rinfo_new, sizeof(struct rip_info));
listnode_add(list, rinfo);
@ -2632,6 +2662,36 @@ struct rip *rip_lookup_by_vrf_name(const char *vrf_name)
return RB_FIND(rip_instance_head, &rip_instances, &rip);
}
/* Update ECMP routes to zebra when `allow-ecmp` changed. */
void rip_ecmp_change(struct rip *rip)
{
struct route_node *rp;
struct rip_info *rinfo;
struct list *list;
struct listnode *node, *nextnode;
for (rp = route_top(rip->table); rp; rp = route_next(rp)) {
list = rp->info;
if (list && listcount(list) > 1) {
while (listcount(list) > rip->ecmp) {
struct rip_info *from_highest = NULL;
for (ALL_LIST_ELEMENTS(list, node, nextnode,
rinfo)) {
if (!from_highest ||
(from_highest &&
IPV4_ADDR_CMP(
&rinfo->from,
&from_highest->from) > 0))
from_highest = rinfo;
}
rip_ecmp_delete(rip, from_highest);
}
}
}
}
/* Create new RIP instance and set it to global variable. */
struct rip *rip_create(const char *vrf_name, struct vrf *vrf, int socket)
{
@ -2641,7 +2701,7 @@ struct rip *rip_create(const char *vrf_name, struct vrf *vrf, int socket)
rip->vrf_name = XSTRDUP(MTYPE_RIP_VRF_NAME, vrf_name);
/* Set initial value. */
rip->ecmp = yang_get_default_bool("%s/allow-ecmp", RIP_INSTANCE);
rip->ecmp = yang_get_default_uint8("%s/allow-ecmp", RIP_INSTANCE);
rip->default_metric =
yang_get_default_uint8("%s/default-metric", RIP_INSTANCE);
rip->distance =

4
ripd/ripd.h
View file

@ -141,7 +141,7 @@ struct rip {
struct route_table *distance_table;
/* RIP ECMP flag */
bool ecmp;
uint8_t ecmp;
/* Are we in passive-interface default mode? */
bool passive_default;
@ -537,4 +537,6 @@ extern struct event_loop *master;
DECLARE_HOOK(rip_ifaddr_add, (struct connected * ifc), (ifc));
DECLARE_HOOK(rip_ifaddr_del, (struct connected * ifc), (ifc));
extern void rip_ecmp_change(struct rip *rip);
#endif /* _ZEBRA_RIP_H */

13
tests/topotests/rip_allow_ecmp/r4/frr.conf Normal file
View file

@ -0,0 +1,13 @@
!
int lo
ip address 10.10.10.1/32
!
int r4-eth0
ip address 192.168.1.4/24
!
router rip
network 192.168.1.0/24
network 10.10.10.1/32
timers basic 5 15 10
exit

13
tests/topotests/rip_allow_ecmp/r5/frr.conf Normal file
View file

@ -0,0 +1,13 @@
!
int lo
ip address 10.10.10.1/32
!
int r5-eth0
ip address 192.168.1.5/24
!
router rip
network 192.168.1.0/24
network 10.10.10.1/32
timers basic 5 15 10
exit

34
tests/topotests/rip_allow_ecmp/test_rip_allow_ecmp.py
View file

@ -21,12 +21,13 @@ sys.path.append(os.path.join(CWD, "../"))
# pylint: disable=C0413
from lib import topotest
from lib.topogen import Topogen, TopoRouter, get_topogen
from lib.common_config import step
pytestmark = [pytest.mark.ripd]
def setup_module(mod):
topodef = {"s1": ("r1", "r2", "r3")}
topodef = {"s1": ("r1", "r2", "r3", "r4", "r5")}
tgen = Topogen(topodef, mod.__name__)
tgen.start_topology()
@ -102,11 +103,13 @@ def test_rip_allow_ecmp():
_, result = topotest.run_and_expect(test_func, None, count=60, wait=1)
assert result is None, "Can't see 10.10.10.1/32 as multipath in `show ip rip`"
def _show_routes():
def _show_routes(nh_num):
output = json.loads(r1.vtysh_cmd("show ip route json"))
expected = {
"10.10.10.1/32": [
{
"internalNextHopNum": nh_num,
"internalNextHopActiveNum": nh_num,
"nexthops": [
{
"ip": "192.168.1.2",
@ -116,15 +119,36 @@ def test_rip_allow_ecmp():
"ip": "192.168.1.3",
"active": True,
},
]
],
}
]
}
return topotest.json_cmp(output, expected)
test_func = functools.partial(_show_routes)
test_func = functools.partial(_show_routes, 4)
_, result = topotest.run_and_expect(test_func, None, count=60, wait=1)
assert result is None, "Can't see 10.10.10.1/32 as multipath in `show ip route`"
assert result is None, "Can't see 10.10.10.1/32 as multipath (4) in `show ip route`"
step(
"Configure allow-ecmp 2, ECMP group routes SHOULD have next-hops with the lowest IPs"
)
r1.vtysh_cmd(
"""
configure terminal
router rip
allow-ecmp 2
"""
)
test_func = functools.partial(_show_rip_routes)
_, result = topotest.run_and_expect(test_func, None, count=60, wait=1)
assert (
result is None
), "Can't see 10.10.10.1/32 as ECMP with the lowest next-hop IPs"
test_func = functools.partial(_show_routes, 2)
_, result = topotest.run_and_expect(test_func, None, count=60, wait=1)
assert result is None, "Can't see 10.10.10.1/32 as multipath (2) in `show ip route`"
if __name__ == "__main__":

2
yang/example/ripd.json
View file

@ -23,7 +23,7 @@
"instance": [
{
"vrf": "default",
"allow-ecmp": "true",
"allow-ecmp": 1,
"distance": {
"source": [
{

2
yang/example/ripd.xml
View file

@ -19,7 +19,7 @@
<ripd xmlns="http://frrouting.org/yang/ripd">
<instance>
<vrf>default</vrf>
<allow-ecmp>true</allow-ecmp>
<allow-ecmp>1</allow-ecmp>
<static-route>10.0.1.0/24</static-route>
<distance>
<source>

4
yang/frr-ripd.yang
View file

@ -119,8 +119,8 @@ module frr-ripd {
"VRF name.";
}
leaf allow-ecmp {
type boolean;
default "false";
type uint8;
default 0;
description
"Allow equal-cost multi-path.";
}