zebra: clear evpn dup-addr return error-msg when there is no vni

clear evpn dup-addr cli returns error-msg for below conditions,

 - If evpn is not enabled &
 - If there is no VNI exists.

supported command:

```
clear evpn dup-addr vni <vni-id>
```

Ticket: #3495573

Testing:

bharat# clear evpn dup-addr vni all
Error type: validation
Error description: % EVPN not enabled

bharat# clear evpn dup-addr vni 20
Error type: validation
Error description: % VNI 20 does not exist

Signed-off-by: Sindhu Parvathi Gopinathan's <sgopinathan@nvidia.com>
Signed-off-by: Chirag Shah <chirag@nvidia.com>

diff --git a/zebra/zebra_nb_rpcs.c b/zebra/zebra_nb_rpcs.c
index 938193df2f2a63bdfe2459f5aee3a99dae8c0890..744ba620f22ea2c00102b0c85ba78f37dbcda7c9 100644 (file)
--- a/zebra/zebra_nb_rpcs.c
+++ b/zebra/zebra_nb_rpcs.c
@@ -12,6 +12,8 @@
 #include "zebra/zebra_router.h"
 #include "zebra/zebra_vrf.h"
 #include "zebra/zebra_vxlan.h"
+#include "zebra/zebra_vxlan_if.h"
+#include "zebra/zebra_evpn.h"
 
 /*
  * XPath: /frr-zebra:clear-evpn-dup-addr
@@ -21,6 +23,11 @@ int clear_evpn_dup_addr_rpc(struct nb_cb_rpc_args *args)
        struct zebra_vrf *zvrf;
        int ret = NB_OK;
 
+       if (!is_evpn_enabled()) {
+               snprintf(args->errmsg, args->errmsg_len,
+                        "%% EVPN not enabled\n");
+               return NB_ERR_VALIDATION;
+       }
        zvrf = zebra_vrf_get_evpn();
 
        if (yang_dnode_exists(args->input, "all-vnis")) {
@@ -30,6 +37,12 @@ int clear_evpn_dup_addr_rpc(struct nb_cb_rpc_args *args)
                struct ipaddr host_ip = {.ipa_type = IPADDR_NONE};
                struct ethaddr mac;
 
+               if (!zebra_evpn_lookup(vni)) {
+                       snprintf(args->errmsg, args->errmsg_len,
+                                "%% VNI %u does not exist\n", vni);
+                       return NB_ERR_VALIDATION;
+               }
+
                if (yang_dnode_exists(args->input, "mac-addr")) {
                        yang_dnode_get_mac(&mac, args->input, "mac-addr");
                        ret = zebra_vxlan_clear_dup_detect_vni_mac(zvrf, vni,