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Merge pull request #13535 from opensourcerouting/feature/ripng_allow_ecmp
ripng: Implement allow-ecmp X command
This commit is contained in:
commit
fa45a19a60
@ -38,6 +38,10 @@ Currently ripngd supports the following commands:
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Set RIPng static routing announcement of NETWORK.
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.. clicmd:: allow-ecmp [1-MULTIPATH_NUM]
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Control how many ECMP paths RIPng can inject for the same prefix. If specified
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without a number, a maximum is taken (compiled with ``--enable-multipath``).
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.. _ripngd-terminal-mode-commands:
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@ -85,14 +85,32 @@ void cli_show_router_ripng(struct vty *vty, const struct lyd_node *dnode,
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/*
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* XPath: /frr-ripngd:ripngd/instance/allow-ecmp
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*/
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DEFPY_YANG (ripng_allow_ecmp,
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ripng_allow_ecmp_cmd,
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"[no] allow-ecmp",
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NO_STR
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"Allow Equal Cost MultiPath\n")
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DEFUN_YANG (ripng_allow_ecmp,
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ripng_allow_ecmp_cmd,
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"allow-ecmp [" CMD_RANGE_STR(1, MULTIPATH_NUM) "]",
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"Allow Equal Cost MultiPath\n"
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"Number of paths\n")
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{
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nb_cli_enqueue_change(vty, "./allow-ecmp", NB_OP_MODIFY,
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no ? "false" : "true");
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int idx_number = 0;
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char mpaths[3] = {};
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uint32_t paths = MULTIPATH_NUM;
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if (argv_find(argv, argc, CMD_RANGE_STR(1, MULTIPATH_NUM), &idx_number))
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paths = strtol(argv[idx_number]->arg, NULL, 10);
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snprintf(mpaths, sizeof(mpaths), "%u", paths);
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nb_cli_enqueue_change(vty, "./allow-ecmp", NB_OP_MODIFY, mpaths);
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return nb_cli_apply_changes(vty, NULL);
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}
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DEFUN_YANG (no_ripng_allow_ecmp,
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no_ripng_allow_ecmp_cmd,
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"no allow-ecmp [" CMD_RANGE_STR(1, MULTIPATH_NUM) "]", NO_STR
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"Allow Equal Cost MultiPath\n"
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"Number of paths\n")
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{
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nb_cli_enqueue_change(vty, "./allow-ecmp", NB_OP_MODIFY, 0);
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return nb_cli_apply_changes(vty, NULL);
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}
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@ -100,10 +118,14 @@ DEFPY_YANG (ripng_allow_ecmp,
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void cli_show_ripng_allow_ecmp(struct vty *vty, const struct lyd_node *dnode,
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bool show_defaults)
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{
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if (!yang_dnode_get_bool(dnode, NULL))
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vty_out(vty, " no");
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uint8_t paths;
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vty_out(vty, " allow-ecmp\n");
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paths = yang_dnode_get_uint8(dnode, NULL);
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if (!paths)
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vty_out(vty, " no allow-ecmp\n");
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else
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vty_out(vty, " allow-ecmp %d\n", paths);
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}
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/*
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@ -547,6 +569,7 @@ void ripng_cli_init(void)
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install_element(RIPNG_NODE, &ripng_no_ipv6_distribute_list_cmd);
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install_element(RIPNG_NODE, &ripng_allow_ecmp_cmd);
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install_element(RIPNG_NODE, &no_ripng_allow_ecmp_cmd);
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install_element(RIPNG_NODE, &ripng_default_information_originate_cmd);
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install_element(RIPNG_NODE, &ripng_default_metric_cmd);
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install_element(RIPNG_NODE, &no_ripng_default_metric_cmd);
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@ -32,6 +32,8 @@ struct option longopts[] = {{0}};
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/* ripngd privileges */
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zebra_capabilities_t _caps_p[] = {ZCAP_NET_RAW, ZCAP_BIND, ZCAP_SYS_ADMIN};
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uint32_t zebra_ecmp_count = MULTIPATH_NUM;
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struct zebra_privs_t ripngd_privs = {
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#if defined(FRR_USER)
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.user = FRR_USER,
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@ -129,9 +129,14 @@ int ripngd_instance_allow_ecmp_modify(struct nb_cb_modify_args *args)
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return NB_OK;
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ripng = nb_running_get_entry(args->dnode, NULL, true);
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ripng->ecmp = yang_dnode_get_bool(args->dnode, NULL);
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if (!ripng->ecmp)
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ripng->ecmp =
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MIN(yang_dnode_get_uint8(args->dnode, NULL), zebra_ecmp_count);
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if (!ripng->ecmp) {
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ripng_ecmp_disable(ripng);
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return NB_OK;
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}
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ripng_ecmp_change(ripng);
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return NB_OK;
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}
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@ -30,7 +30,7 @@ static void ripng_zebra_ipv6_send(struct ripng *ripng, struct agg_node *rp,
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struct zapi_nexthop *api_nh;
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struct listnode *listnode = NULL;
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struct ripng_info *rinfo = NULL;
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int count = 0;
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uint32_t count = 0;
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const struct prefix *p = agg_node_get_prefix(rp);
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memset(&api, 0, sizeof(api));
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@ -41,7 +41,7 @@ static void ripng_zebra_ipv6_send(struct ripng *ripng, struct agg_node *rp,
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SET_FLAG(api.message, ZAPI_MESSAGE_NEXTHOP);
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for (ALL_LIST_ELEMENTS_RO(list, listnode, rinfo)) {
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if (count >= MULTIPATH_NUM)
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if (count >= zebra_ecmp_count)
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break;
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api_nh = &api.nexthops[count];
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api_nh->vrf_id = ripng->vrf->vrf_id;
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@ -227,6 +227,11 @@ static zclient_handler *const ripng_handlers[] = {
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[ZEBRA_REDISTRIBUTE_ROUTE_DEL] = ripng_zebra_read_route,
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};
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static void ripng_zebra_capabilities(struct zclient_capabilities *cap)
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{
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zebra_ecmp_count = MIN(cap->ecmp, zebra_ecmp_count);
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}
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/* Initialize zebra structure and it's commands. */
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void zebra_init(struct event_loop *master)
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{
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@ -236,6 +241,7 @@ void zebra_init(struct event_loop *master)
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zclient_init(zclient, ZEBRA_ROUTE_RIPNG, 0, &ripngd_privs);
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zclient->zebra_connected = ripng_zebra_connected;
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zclient->zebra_capabilities = ripng_zebra_capabilities;
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}
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void ripng_zebra_stop(void)
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@ -443,7 +443,10 @@ struct ripng_info *ripng_ecmp_add(struct ripng *ripng,
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{
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struct agg_node *rp = rinfo_new->rp;
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struct ripng_info *rinfo = NULL;
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struct ripng_info *rinfo_exist = NULL;
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struct list *list = NULL;
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struct listnode *node = NULL;
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struct listnode *nnode = NULL;
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if (rp->info == NULL)
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rp->info = list_new();
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@ -454,6 +457,33 @@ struct ripng_info *ripng_ecmp_add(struct ripng *ripng,
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if (listcount(list) && !ripng->ecmp)
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return NULL;
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/* Add or replace an existing ECMP path with lower neighbor IP */
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if (listcount(list) && listcount(list) >= ripng->ecmp) {
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struct ripng_info *from_highest = NULL;
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/* Find the rip_info struct that has the highest nexthop IP */
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for (ALL_LIST_ELEMENTS(list, node, nnode, rinfo_exist))
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if (!from_highest ||
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(from_highest &&
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IPV6_ADDR_CMP(&rinfo_exist->from,
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&from_highest->from) > 0)) {
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from_highest = rinfo_exist;
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}
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/* If we have a route in ECMP group, delete the old
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* one that has a higher next-hop address. Lower IP is
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* preferred.
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*/
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if (ripng->ecmp > 1 && from_highest &&
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IPV6_ADDR_CMP(&from_highest->from, &rinfo_new->from) > 0) {
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ripng_ecmp_delete(ripng, from_highest);
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goto add_or_replace;
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}
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return NULL;
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}
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add_or_replace:
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rinfo = ripng_info_new();
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memcpy(rinfo, rinfo_new, sizeof(struct ripng_info));
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listnode_add(list, rinfo);
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@ -475,6 +505,36 @@ struct ripng_info *ripng_ecmp_add(struct ripng *ripng,
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return rinfo;
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}
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/* Update ECMP routes to zebra when `allow-ecmp` changed. */
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void ripng_ecmp_change(struct ripng *ripng)
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{
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struct agg_node *rp;
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struct ripng_info *rinfo;
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struct list *list;
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struct listnode *node, *nextnode;
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for (rp = agg_route_top(ripng->table); rp; rp = agg_route_next(rp)) {
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list = rp->info;
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if (list && listcount(list) > 1) {
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while (listcount(list) > ripng->ecmp) {
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struct ripng_info *from_highest = NULL;
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for (ALL_LIST_ELEMENTS(list, node, nextnode,
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rinfo)) {
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if (!from_highest ||
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(from_highest &&
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IPV6_ADDR_CMP(
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&rinfo->from,
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&from_highest->from) > 0))
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from_highest = rinfo;
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}
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ripng_ecmp_delete(ripng, from_highest);
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}
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}
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}
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}
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/* Replace the ECMP list with the new route.
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* RETURN: the new entry added in the list
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*/
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@ -1814,7 +1874,7 @@ struct ripng *ripng_create(const char *vrf_name, struct vrf *vrf, int socket)
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"%s/timers/flush-interval", RIPNG_INSTANCE);
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ripng->default_metric =
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yang_get_default_uint8("%s/default-metric", RIPNG_INSTANCE);
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ripng->ecmp = yang_get_default_bool("%s/allow-ecmp", RIPNG_INSTANCE);
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ripng->ecmp = yang_get_default_uint8("%s/allow-ecmp", RIPNG_INSTANCE);
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/* Make buffer. */
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ripng->ibuf = stream_new(RIPNG_MAX_PACKET_SIZE * 5);
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@ -130,7 +130,7 @@ struct ripng {
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struct event *t_triggered_interval;
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/* RIPng ECMP flag */
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bool ecmp;
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uint8_t ecmp;
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/* RIPng redistribute configuration. */
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struct {
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@ -429,9 +429,12 @@ extern struct ripng_info *ripng_ecmp_replace(struct ripng *ripng,
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struct ripng_info *rinfo);
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extern struct ripng_info *ripng_ecmp_delete(struct ripng *ripng,
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struct ripng_info *rinfo);
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extern void ripng_ecmp_change(struct ripng *ripng);
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extern void ripng_vrf_init(void);
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extern void ripng_vrf_terminate(void);
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extern void ripng_cli_init(void);
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extern uint32_t zebra_ecmp_count;
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#endif /* _ZEBRA_RIPNG_RIPNGD_H */
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0
tests/topotests/ripng_allow_ecmp/__init__.py
Normal file
0
tests/topotests/ripng_allow_ecmp/__init__.py
Normal file
9
tests/topotests/ripng_allow_ecmp/r1/frr.conf
Normal file
9
tests/topotests/ripng_allow_ecmp/r1/frr.conf
Normal file
@ -0,0 +1,9 @@
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!
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int r1-eth0
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ipv6 address 2001:db8:1::1/64
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!
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router ripng
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allow-ecmp
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network 2001:db8:1::/64
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timers basic 5 15 10
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exit
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tests/topotests/ripng_allow_ecmp/r2/frr.conf
Normal file
13
tests/topotests/ripng_allow_ecmp/r2/frr.conf
Normal file
@ -0,0 +1,13 @@
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!
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int lo
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ipv6 address 2001:db8:2::1/64
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!
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int r2-eth0
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ipv6 address 2001:db8:1::2/64
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!
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router ripng
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redistribute connected
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network 2001:db8:1::/64
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network 2001:db8:2::/64
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timers basic 5 15 10
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exit
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14
tests/topotests/ripng_allow_ecmp/r3/frr.conf
Normal file
14
tests/topotests/ripng_allow_ecmp/r3/frr.conf
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@ -0,0 +1,14 @@
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!
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int lo
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ipv6 address 2001:db8:2::1/64
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!
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int r3-eth0
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ipv6 address 2001:db8:1::3/64
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!
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router ripng
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redistribute connected
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network 2001:db8:1::/64
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network 2001:db8:2::/64
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timers basic 5 15 10
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exit
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14
tests/topotests/ripng_allow_ecmp/r4/frr.conf
Normal file
14
tests/topotests/ripng_allow_ecmp/r4/frr.conf
Normal file
@ -0,0 +1,14 @@
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!
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int lo
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ipv6 address 2001:db8:2::1/64
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!
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int r4-eth0
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ipv6 address 2001:db8:1::4/64
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!
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router ripng
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redistribute connected
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network 2001:db8:1::/64
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network 2001:db8:2::/64
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timers basic 5 15 10
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exit
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14
tests/topotests/ripng_allow_ecmp/r5/frr.conf
Normal file
14
tests/topotests/ripng_allow_ecmp/r5/frr.conf
Normal file
@ -0,0 +1,14 @@
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!
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int lo
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ipv6 address 2001:db8:2::1/64
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!
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int r5-eth0
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ipv6 address 2001:db8:1::5/64
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!
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router ripng
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redistribute connected
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network 2001:db8:1::/64
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network 2001:db8:2::/64
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timers basic 5 15 10
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exit
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93
tests/topotests/ripng_allow_ecmp/test_ripng_allow_ecmp.py
Normal file
93
tests/topotests/ripng_allow_ecmp/test_ripng_allow_ecmp.py
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@ -0,0 +1,93 @@
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#!/usr/bin/env python
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# SPDX-License-Identifier: ISC
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# Copyright (c) 2023 by
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# Donatas Abraitis <donatas@opensourcerouting.org>
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#
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"""
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Test if RIPng `allow-ecmp` command works correctly.
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"""
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import os
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import sys
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import json
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import pytest
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import functools
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CWD = os.path.dirname(os.path.realpath(__file__))
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sys.path.append(os.path.join(CWD, "../"))
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# pylint: disable=C0413
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from lib import topotest
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from lib.topogen import Topogen, TopoRouter, get_topogen
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from lib.common_config import step
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pytestmark = [pytest.mark.ripngd]
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def setup_module(mod):
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topodef = {"s1": ("r1", "r2", "r3", "r4", "r5")}
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tgen = Topogen(topodef, mod.__name__)
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tgen.start_topology()
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router_list = tgen.routers()
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for _, (rname, router) in enumerate(router_list.items(), 1):
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router.load_frr_config(os.path.join(CWD, "{}/frr.conf".format(rname)))
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tgen.start_router()
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def teardown_module(mod):
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tgen = get_topogen()
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tgen.stop_topology()
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def test_ripng_allow_ecmp():
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tgen = get_topogen()
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if tgen.routers_have_failure():
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pytest.skip(tgen.errors)
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r1 = tgen.gears["r1"]
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def _show_routes(nh_num):
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output = json.loads(r1.vtysh_cmd("show ipv6 route json"))
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expected = {
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"2001:db8:2::/64": [
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{
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"internalNextHopNum": nh_num,
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"internalNextHopActiveNum": nh_num,
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}
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]
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}
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return topotest.json_cmp(output, expected)
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test_func = functools.partial(_show_routes, 4)
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_, result = topotest.run_and_expect(test_func, None, count=60, wait=1)
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assert (
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result is None
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), "Can't see 2001:db8:2::/64 as multipath (4) in `show ipv6 route`"
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step(
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"Configure allow-ecmp 2, ECMP group routes SHOULD have next-hops with the lowest IPs"
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)
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r1.vtysh_cmd(
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"""
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configure terminal
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router ripng
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allow-ecmp 2
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"""
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)
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test_func = functools.partial(_show_routes, 2)
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_, result = topotest.run_and_expect(test_func, None, count=60, wait=1)
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assert (
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result is None
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), "Can't see 2001:db8:2::/64 as multipath (2) in `show ipv6 route`"
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if __name__ == "__main__":
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args = ["-s"] + sys.argv[1:]
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sys.exit(pytest.main(args))
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@ -86,8 +86,8 @@ module frr-ripngd {
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"VRF name.";
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}
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leaf allow-ecmp {
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type boolean;
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default "false";
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type uint8;
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default 0;
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description
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"Allow equal-cost multi-path.";
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}
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