Merge pull request #6150 from ton31337/feature/black_topotests_developer_guide

[mirror_frr.git] / bgpd / bgp_evpn.c

/* Ethernet-VPN Packet and vty Processing File
 * Copyright (C) 2016 6WIND
 * Copyright (C) 2017 Cumulus Networks, Inc.
 *
 * This file is part of FRR.
 *
 * FRRouting is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2, or (at your option) any
 * later version.
 *
 * FRRouting is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; see the file COPYING; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include <zebra.h>

#include "command.h"
#include "filter.h"
#include "prefix.h"
#include "log.h"
#include "memory.h"
#include "stream.h"
#include "hash.h"
#include "jhash.h"
#include "zclient.h"

#include "bgpd/bgp_attr_evpn.h"
#include "bgpd/bgpd.h"
#include "bgpd/bgp_table.h"
#include "bgpd/bgp_route.h"
#include "bgpd/bgp_attr.h"
#include "bgpd/bgp_mplsvpn.h"
#include "bgpd/bgp_label.h"
#include "bgpd/bgp_evpn.h"
#include "bgpd/bgp_evpn_private.h"
#include "bgpd/bgp_ecommunity.h"
#include "bgpd/bgp_encap_types.h"
#include "bgpd/bgp_debug.h"
#include "bgpd/bgp_errors.h"
#include "bgpd/bgp_aspath.h"
#include "bgpd/bgp_zebra.h"
#include "bgpd/bgp_nexthop.h"
#include "bgpd/bgp_addpath.h"
#include "bgpd/bgp_mac.h"
#include "bgpd/bgp_vty.h"

/*
 * Definitions and external declarations.
 */
extern struct zclient *zclient;

DEFINE_QOBJ_TYPE(bgpevpn)
DEFINE_QOBJ_TYPE(evpnes)


/*
 * Static function declarations
 */
static void delete_evpn_route_entry(struct bgp *bgp, afi_t afi, safi_t safi,
                                    struct bgp_node *rn,
                                    struct bgp_path_info **pi);
static int delete_all_vni_routes(struct bgp *bgp, struct bgpevpn *vpn);

/*
 * Private functions.
 */

/* compare two IPV4 VTEP IPs */
static int evpn_vtep_ip_cmp(void *p1, void *p2)
{
        const struct in_addr *ip1 = p1;
        const struct in_addr *ip2 = p2;

        return ip1->s_addr - ip2->s_addr;
}

/*
 * Make hash key for ESI.
 */
static unsigned int esi_hash_keymake(const void *p)
{
        const struct evpnes *pes = p;
        const void *pnt = (void *)pes->esi.val;

        return jhash(pnt, ESI_BYTES, 0xa5a5a55a);
}

/*
 * Compare two ESIs.
 */
static bool esi_cmp(const void *p1, const void *p2)
{
        const struct evpnes *pes1 = p1;
        const struct evpnes *pes2 = p2;

        if (pes1 == NULL && pes2 == NULL)
                return true;

        if (pes1 == NULL || pes2 == NULL)
                return false;

        return (memcmp(pes1->esi.val, pes2->esi.val, ESI_BYTES) == 0);
}

/*
 * Make vni hash key.
 */
static unsigned int vni_hash_key_make(const void *p)
{
        const struct bgpevpn *vpn = p;
        return (jhash_1word(vpn->vni, 0));
}

/*
 * Comparison function for vni hash
 */
static bool vni_hash_cmp(const void *p1, const void *p2)
{
        const struct bgpevpn *vpn1 = p1;
        const struct bgpevpn *vpn2 = p2;

        if (!vpn1 && !vpn2)
                return true;
        if (!vpn1 || !vpn2)
                return false;
        return (vpn1->vni == vpn2->vni);
}

static int vni_list_cmp(void *p1, void *p2)
{
        const struct bgpevpn *vpn1 = p1;
        const struct bgpevpn *vpn2 = p2;

        return vpn1->vni - vpn2->vni;
}

/*
 * Make vrf import route target hash key.
 */
static unsigned int vrf_import_rt_hash_key_make(const void *p)
{
        const struct vrf_irt_node *irt = p;
        const char *pnt = irt->rt.val;

        return jhash(pnt, 8, 0x5abc1234);
}

/*
 * Comparison function for vrf import rt hash
 */
static bool vrf_import_rt_hash_cmp(const void *p1, const void *p2)
{
        const struct vrf_irt_node *irt1 = p1;
        const struct vrf_irt_node *irt2 = p2;

        if (irt1 == NULL && irt2 == NULL)
                return true;

        if (irt1 == NULL || irt2 == NULL)
                return false;

        return (memcmp(irt1->rt.val, irt2->rt.val, ECOMMUNITY_SIZE) == 0);
}

/*
 * Create a new vrf import_rt in evpn instance
 */
static struct vrf_irt_node *vrf_import_rt_new(struct ecommunity_val *rt)
{
        struct bgp *bgp_evpn = NULL;
        struct vrf_irt_node *irt;

        bgp_evpn = bgp_get_evpn();
        if (!bgp_evpn) {
                flog_err(EC_BGP_NO_DFLT,
                         "vrf import rt new - evpn instance not created yet");
                return NULL;
        }

        irt = XCALLOC(MTYPE_BGP_EVPN_VRF_IMPORT_RT,
                      sizeof(struct vrf_irt_node));

        irt->rt = *rt;
        irt->vrfs = list_new();

        /* Add to hash */
        if (!hash_get(bgp_evpn->vrf_import_rt_hash, irt, hash_alloc_intern)) {
                XFREE(MTYPE_BGP_EVPN_VRF_IMPORT_RT, irt);
                return NULL;
        }

        return irt;
}

/*
 * Free the vrf import rt node
 */
static void vrf_import_rt_free(struct vrf_irt_node *irt)
{
        struct bgp *bgp_evpn = NULL;

        bgp_evpn = bgp_get_evpn();
        if (!bgp_evpn) {
                flog_err(EC_BGP_NO_DFLT,
                         "vrf import rt free - evpn instance not created yet");
                return;
        }

        hash_release(bgp_evpn->vrf_import_rt_hash, irt);
        list_delete(&irt->vrfs);
        XFREE(MTYPE_BGP_EVPN_VRF_IMPORT_RT, irt);
}

/*
 * Function to lookup Import RT node - used to map a RT to set of
 * VNIs importing routes with that RT.
 */
static struct vrf_irt_node *lookup_vrf_import_rt(struct ecommunity_val *rt)
{
        struct bgp *bgp_evpn = NULL;
        struct vrf_irt_node *irt;
        struct vrf_irt_node tmp;

        bgp_evpn = bgp_get_evpn();
        if (!bgp_evpn) {
                flog_err(
                        EC_BGP_NO_DFLT,
                        "vrf import rt lookup - evpn instance not created yet");
                return NULL;
        }

        memset(&tmp, 0, sizeof(struct vrf_irt_node));
        memcpy(&tmp.rt, rt, ECOMMUNITY_SIZE);
        irt = hash_lookup(bgp_evpn->vrf_import_rt_hash, &tmp);
        return irt;
}

/*
 * Is specified VRF present on the RT's list of "importing" VRFs?
 */
static int is_vrf_present_in_irt_vrfs(struct list *vrfs, struct bgp *bgp_vrf)
{
        struct listnode *node = NULL, *nnode = NULL;
        struct bgp *tmp_bgp_vrf = NULL;

        for (ALL_LIST_ELEMENTS(vrfs, node, nnode, tmp_bgp_vrf)) {
                if (tmp_bgp_vrf == bgp_vrf)
                        return 1;
        }
        return 0;
}

/*
 * Make import route target hash key.
 */
static unsigned int import_rt_hash_key_make(const void *p)
{
        const struct irt_node *irt = p;
        const char *pnt = irt->rt.val;

        return jhash(pnt, 8, 0xdeadbeef);
}

/*
 * Comparison function for import rt hash
 */
static bool import_rt_hash_cmp(const void *p1, const void *p2)
{
        const struct irt_node *irt1 = p1;
        const struct irt_node *irt2 = p2;

        if (irt1 == NULL && irt2 == NULL)
                return true;

        if (irt1 == NULL || irt2 == NULL)
                return false;

        return (memcmp(irt1->rt.val, irt2->rt.val, ECOMMUNITY_SIZE) == 0);
}

/*
 * Create a new import_rt
 */
static struct irt_node *import_rt_new(struct bgp *bgp,
                                      struct ecommunity_val *rt)
{
        struct irt_node *irt;

        if (!bgp)
                return NULL;

        irt = XCALLOC(MTYPE_BGP_EVPN_IMPORT_RT, sizeof(struct irt_node));

        irt->rt = *rt;
        irt->vnis = list_new();

        /* Add to hash */
        if (!hash_get(bgp->import_rt_hash, irt, hash_alloc_intern)) {
                XFREE(MTYPE_BGP_EVPN_IMPORT_RT, irt);
                return NULL;
        }

        return irt;
}

/*
 * Free the import rt node
 */
static void import_rt_free(struct bgp *bgp, struct irt_node *irt)
{
        hash_release(bgp->import_rt_hash, irt);
        list_delete(&irt->vnis);
        XFREE(MTYPE_BGP_EVPN_IMPORT_RT, irt);
}

/*
 * Function to lookup Import RT node - used to map a RT to set of
 * VNIs importing routes with that RT.
 */
static struct irt_node *lookup_import_rt(struct bgp *bgp,
                                         struct ecommunity_val *rt)
{
        struct irt_node *irt;
        struct irt_node tmp;

        memset(&tmp, 0, sizeof(struct irt_node));
        memcpy(&tmp.rt, rt, ECOMMUNITY_SIZE);
        irt = hash_lookup(bgp->import_rt_hash, &tmp);
        return irt;
}

/*
 * Is specified VNI present on the RT's list of "importing" VNIs?
 */
static int is_vni_present_in_irt_vnis(struct list *vnis, struct bgpevpn *vpn)
{
        struct listnode *node, *nnode;
        struct bgpevpn *tmp_vpn;

        for (ALL_LIST_ELEMENTS(vnis, node, nnode, tmp_vpn)) {
                if (tmp_vpn == vpn)
                        return 1;
        }

        return 0;
}

/*
 * Compare Route Targets.
 */
static int evpn_route_target_cmp(struct ecommunity *ecom1,
                                 struct ecommunity *ecom2)
{
        if (ecom1 && !ecom2)
                return -1;

        if (!ecom1 && ecom2)
                return 1;

        if (!ecom1 && !ecom2)
                return 0;

        if (ecom1->str && !ecom2->str)
                return -1;

        if (!ecom1->str && ecom2->str)
                return 1;

        if (!ecom1->str && !ecom2->str)
                return 0;

        return strcmp(ecom1->str, ecom2->str);
}

static void evpn_xxport_delete_ecomm(void *val)
{
        struct ecommunity *ecomm = val;
        ecommunity_free(&ecomm);
}

/*
 * Mask off global-admin field of specified extended community (RT),
 * just retain the local-admin field.
 */
static inline void mask_ecom_global_admin(struct ecommunity_val *dst,
                                          struct ecommunity_val *src)
{
        uint8_t type;

        type = src->val[0];
        dst->val[0] = 0;
        if (type == ECOMMUNITY_ENCODE_AS) {
                dst->val[2] = dst->val[3] = 0;
        } else if (type == ECOMMUNITY_ENCODE_AS4
                   || type == ECOMMUNITY_ENCODE_IP) {
                dst->val[2] = dst->val[3] = 0;
                dst->val[4] = dst->val[5] = 0;
        }
}

/*
 * Map one RT to specified VRF.
 * bgp_vrf = BGP vrf instance
 */
static void map_vrf_to_rt(struct bgp *bgp_vrf, struct ecommunity_val *eval)
{
        struct vrf_irt_node *irt = NULL;
        struct ecommunity_val eval_tmp;

        /* If using "automatic" RT,
         * we only care about the local-admin sub-field.
         * This is to facilitate using L3VNI(VRF-VNI)
         * as the RT for EBGP peering too.
         */
        memcpy(&eval_tmp, eval, ECOMMUNITY_SIZE);
        if (!CHECK_FLAG(bgp_vrf->vrf_flags, BGP_VRF_IMPORT_RT_CFGD))
                mask_ecom_global_admin(&eval_tmp, eval);

        irt = lookup_vrf_import_rt(&eval_tmp);
        if (irt && is_vrf_present_in_irt_vrfs(irt->vrfs, bgp_vrf))
                /* Already mapped. */
                return;

        if (!irt)
                irt = vrf_import_rt_new(&eval_tmp);

        /* Add VRF to the list for this RT. */
        listnode_add(irt->vrfs, bgp_vrf);
}

/*
 * Unmap specified VRF from specified RT. If there are no other
 * VRFs for this RT, then the RT hash is deleted.
 * bgp_vrf: BGP VRF specific instance
 */
static void unmap_vrf_from_rt(struct bgp *bgp_vrf, struct vrf_irt_node *irt)
{
        /* Delete VRF from list for this RT. */
        listnode_delete(irt->vrfs, bgp_vrf);
        if (!listnode_head(irt->vrfs)) {
                vrf_import_rt_free(irt);
        }
}

/*
 * Map one RT to specified VNI.
 */
static void map_vni_to_rt(struct bgp *bgp, struct bgpevpn *vpn,
                          struct ecommunity_val *eval)
{
        struct irt_node *irt;
        struct ecommunity_val eval_tmp;

        /* If using "automatic" RT, we only care about the local-admin
         * sub-field.
         * This is to facilitate using VNI as the RT for EBGP peering too.
         */
        memcpy(&eval_tmp, eval, ECOMMUNITY_SIZE);
        if (!is_import_rt_configured(vpn))
                mask_ecom_global_admin(&eval_tmp, eval);

        irt = lookup_import_rt(bgp, &eval_tmp);
        if (irt)
                if (is_vni_present_in_irt_vnis(irt->vnis, vpn))
                        /* Already mapped. */
                        return;

        if (!irt) {
                irt = import_rt_new(bgp, &eval_tmp);
                assert(irt);
        }

        /* Add VNI to the hash list for this RT. */
        listnode_add(irt->vnis, vpn);
}

/*
 * Unmap specified VNI from specified RT. If there are no other
 * VNIs for this RT, then the RT hash is deleted.
 */
static void unmap_vni_from_rt(struct bgp *bgp, struct bgpevpn *vpn,
                              struct irt_node *irt)
{
        /* Delete VNI from hash list for this RT. */
        listnode_delete(irt->vnis, vpn);
        if (!listnode_head(irt->vnis)) {
                import_rt_free(bgp, irt);
        }
}

static void bgp_evpn_get_rmac_nexthop(struct bgpevpn *vpn,
                                      const struct prefix_evpn *p,
                                      struct attr *attr, uint8_t flags)
{
        struct bgp *bgp_vrf = vpn->bgp_vrf;

        memset(&attr->rmac, 0, sizeof(struct ethaddr));
        if (!bgp_vrf)
                return;

        if (p->prefix.route_type != BGP_EVPN_MAC_IP_ROUTE)
                return;

        /* Copy sys (pip) RMAC and PIP IP as nexthop
         * in case of route is self MAC-IP,
         * advertise-pip and advertise-svi-ip features
         * are enabled.
         * Otherwise, for all host MAC-IP route's
         * copy anycast RMAC.
         */
        if (CHECK_FLAG(flags, BGP_EVPN_MACIP_TYPE_SVI_IP)
            && bgp_vrf->evpn_info->advertise_pip &&
            bgp_vrf->evpn_info->is_anycast_mac) {
                /* copy sys rmac */
                memcpy(&attr->rmac, &bgp_vrf->evpn_info->pip_rmac,
                       ETH_ALEN);
                attr->nexthop = bgp_vrf->evpn_info->pip_ip;
                attr->mp_nexthop_global_in =
                        bgp_vrf->evpn_info->pip_ip;
        } else
                memcpy(&attr->rmac, &bgp_vrf->rmac, ETH_ALEN);
}

/*
 * Create RT extended community automatically from passed information:
 * of the form AS:VNI.
 * NOTE: We use only the lower 16 bits of the AS. This is sufficient as
 * the need is to get a RT value that will be unique across different
 * VNIs but the same across routers (in the same AS) for a particular
 * VNI.
 */
static void form_auto_rt(struct bgp *bgp, vni_t vni, struct list *rtl)
{
        struct ecommunity_val eval;
        struct ecommunity *ecomadd, *ecom;
        bool ecom_found = false;
        struct listnode *node;

        if (bgp->advertise_autort_rfc8365)
                vni |= EVPN_AUTORT_VXLAN;
        encode_route_target_as((bgp->as & 0xFFFF), vni, &eval);

        ecomadd = ecommunity_new();
        ecommunity_add_val(ecomadd, &eval, false, false);
        for (ALL_LIST_ELEMENTS_RO(rtl, node, ecom))
                if (ecommunity_cmp(ecomadd, ecom))
                        ecom_found = true;

        if (!ecom_found)
                listnode_add_sort(rtl, ecomadd);
}

/*
 * Derive RD and RT for a VNI automatically. Invoked at the time of
 * creation of a VNI.
 */
static void derive_rd_rt_for_vni(struct bgp *bgp, struct bgpevpn *vpn)
{
        bgp_evpn_derive_auto_rd(bgp, vpn);
        bgp_evpn_derive_auto_rt_import(bgp, vpn);
        bgp_evpn_derive_auto_rt_export(bgp, vpn);
}

/*
 * Convert nexthop (remote VTEP IP) into an IPv6 address.
 */
static void evpn_convert_nexthop_to_ipv6(struct attr *attr)
{
        if (BGP_ATTR_NEXTHOP_AFI_IP6(attr))
                return;
        ipv4_to_ipv4_mapped_ipv6(&attr->mp_nexthop_global, attr->nexthop);
        attr->mp_nexthop_len = IPV6_MAX_BYTELEN;
}

/*
 * Add (update) or delete MACIP from zebra.
 */
static int bgp_zebra_send_remote_macip(struct bgp *bgp, struct bgpevpn *vpn,
                                       const struct prefix_evpn *p,
                                       struct in_addr remote_vtep_ip, int add,
                                       uint8_t flags, uint32_t seq)
{
        struct stream *s;
        int ipa_len;
        char buf1[ETHER_ADDR_STRLEN];
        char buf2[INET6_ADDRSTRLEN];
        char buf3[INET6_ADDRSTRLEN];

        /* Check socket. */
        if (!zclient || zclient->sock < 0)
                return 0;

        /* Don't try to register if Zebra doesn't know of this instance. */
        if (!IS_BGP_INST_KNOWN_TO_ZEBRA(bgp)) {
                if (BGP_DEBUG(zebra, ZEBRA))
                        zlog_debug(
                                "%s: No zebra instance to talk to, not installing remote macip",
                                __func__);
                return 0;
        }
        s = zclient->obuf;
        stream_reset(s);

        zclient_create_header(
                s, add ? ZEBRA_REMOTE_MACIP_ADD : ZEBRA_REMOTE_MACIP_DEL,
                bgp->vrf_id);
        stream_putl(s, vpn->vni);
        stream_put(s, &p->prefix.macip_addr.mac.octet, ETH_ALEN); /* Mac Addr */
        /* IP address length and IP address, if any. */
        if (is_evpn_prefix_ipaddr_none(p))
                stream_putl(s, 0);
        else {
                ipa_len = is_evpn_prefix_ipaddr_v4(p) ? IPV4_MAX_BYTELEN
                                                      : IPV6_MAX_BYTELEN;
                stream_putl(s, ipa_len);
                stream_put(s, &p->prefix.macip_addr.ip.ip.addr, ipa_len);
        }
        stream_put_in_addr(s, &remote_vtep_ip);

        /* TX flags - MAC sticky status and/or gateway mac */
        /* Also TX the sequence number of the best route. */
        if (add) {
                stream_putc(s, flags);
                stream_putl(s, seq);
        }

        stream_putw_at(s, 0, stream_get_endp(s));

        if (bgp_debug_zebra(NULL))
                zlog_debug(
                        "Tx %s MACIP, VNI %u MAC %s IP %s flags 0x%x seq %u remote VTEP %s",
                        add ? "ADD" : "DEL", vpn->vni,
                        prefix_mac2str(&p->prefix.macip_addr.mac,
                                       buf1, sizeof(buf1)),
                        ipaddr2str(&p->prefix.macip_addr.ip,
                                   buf3, sizeof(buf3)), flags, seq,
                        inet_ntop(AF_INET, &remote_vtep_ip, buf2,
                                  sizeof(buf2)));

        return zclient_send_message(zclient);
}

/*
 * Add (update) or delete remote VTEP from zebra.
 */
static int bgp_zebra_send_remote_vtep(struct bgp *bgp, struct bgpevpn *vpn,
                                      const struct prefix_evpn *p,
                                      int flood_control, int add)
{
        struct stream *s;

        /* Check socket. */
        if (!zclient || zclient->sock < 0)
                return 0;

        /* Don't try to register if Zebra doesn't know of this instance. */
        if (!IS_BGP_INST_KNOWN_TO_ZEBRA(bgp)) {
                if (BGP_DEBUG(zebra, ZEBRA))
                        zlog_debug(
                                "%s: No zebra instance to talk to, not installing remote vtep",
                                __func__);
                return 0;
        }

        s = zclient->obuf;
        stream_reset(s);

        zclient_create_header(
                s, add ? ZEBRA_REMOTE_VTEP_ADD : ZEBRA_REMOTE_VTEP_DEL,
                bgp->vrf_id);
        stream_putl(s, vpn->vni);
        if (is_evpn_prefix_ipaddr_v4(p))
                stream_put_in_addr(s, &p->prefix.imet_addr.ip.ipaddr_v4);
        else if (is_evpn_prefix_ipaddr_v6(p)) {
                flog_err(
                        EC_BGP_VTEP_INVALID,
                        "Bad remote IP when trying to %s remote VTEP for VNI %u",
                        add ? "ADD" : "DEL", vpn->vni);
                return -1;
        }
        stream_putl(s, flood_control);

        stream_putw_at(s, 0, stream_get_endp(s));

        if (bgp_debug_zebra(NULL))
                zlog_debug("Tx %s Remote VTEP, VNI %u remote VTEP %s",
                           add ? "ADD" : "DEL", vpn->vni,
                           inet_ntoa(p->prefix.imet_addr.ip.ipaddr_v4));

        return zclient_send_message(zclient);
}

/*
 * Build extended community for EVPN ES (type-4) route
 */
static void build_evpn_type4_route_extcomm(struct evpnes *es,
                                           struct attr *attr)
{
        struct ecommunity ecom_encap;
        struct ecommunity ecom_es_rt;
        struct ecommunity_val eval;
        struct ecommunity_val eval_es_rt;
        bgp_encap_types tnl_type;
        struct ethaddr mac;

        /* Encap */
        tnl_type = BGP_ENCAP_TYPE_VXLAN;
        memset(&ecom_encap, 0, sizeof(ecom_encap));
        encode_encap_extcomm(tnl_type, &eval);
        ecom_encap.size = 1;
        ecom_encap.val = (uint8_t *)eval.val;
        attr->ecommunity = ecommunity_dup(&ecom_encap);

        /* ES import RT */
        memset(&mac, 0, sizeof(struct ethaddr));
        memset(&ecom_es_rt, 0, sizeof(ecom_es_rt));
        es_get_system_mac(&es->esi, &mac);
        encode_es_rt_extcomm(&eval_es_rt, &mac);
        ecom_es_rt.size = 1;
        ecom_es_rt.val = (uint8_t *)eval_es_rt.val;
        attr->ecommunity =
                ecommunity_merge(attr->ecommunity, &ecom_es_rt);

        attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_EXT_COMMUNITIES);
}

/*
 * Build extended communities for EVPN prefix route.
 */
static void build_evpn_type5_route_extcomm(struct bgp *bgp_vrf,
                                           struct attr *attr)
{
        struct ecommunity ecom_encap;
        struct ecommunity_val eval;
        struct ecommunity_val eval_rmac;
        bgp_encap_types tnl_type;
        struct listnode *node, *nnode;
        struct ecommunity *ecom;
        struct ecommunity *old_ecom;
        struct list *vrf_export_rtl = NULL;

        /* Encap */
        tnl_type = BGP_ENCAP_TYPE_VXLAN;
        memset(&ecom_encap, 0, sizeof(ecom_encap));
        encode_encap_extcomm(tnl_type, &eval);
        ecom_encap.size = 1;
        ecom_encap.val = (uint8_t *)eval.val;

        /* Add Encap */
        if (attr->ecommunity) {
                old_ecom = attr->ecommunity;
                ecom = ecommunity_merge(ecommunity_dup(old_ecom), &ecom_encap);
                if (!old_ecom->refcnt)
                        ecommunity_free(&old_ecom);
        } else
                ecom = ecommunity_dup(&ecom_encap);
        attr->ecommunity = ecom;

        /* Add the export RTs for L3VNI/VRF */
        vrf_export_rtl = bgp_vrf->vrf_export_rtl;
        for (ALL_LIST_ELEMENTS(vrf_export_rtl, node, nnode, ecom))
                attr->ecommunity =
                        ecommunity_merge(attr->ecommunity, ecom);

        /* add the router mac extended community */
        if (!is_zero_mac(&attr->rmac)) {
                encode_rmac_extcomm(&eval_rmac, &attr->rmac);
                ecommunity_add_val(attr->ecommunity, &eval_rmac, true, true);
        }

        attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_EXT_COMMUNITIES);
}

/*
 * Build extended communities for EVPN route.
 * This function is applicable for type-2 and type-3 routes. The layer-2 RT
 * and ENCAP extended communities are applicable for all routes.
 * The default gateway extended community and MAC mobility (sticky) extended
 * community are added as needed based on passed settings - only for type-2
 * routes. Likewise, the layer-3 RT and Router MAC extended communities are
 * added, if present, based on passed settings - only for non-link-local
 * type-2 routes.
 */
static void build_evpn_route_extcomm(struct bgpevpn *vpn, struct attr *attr,
                                     int add_l3_ecomm)
{
        struct ecommunity ecom_encap;
        struct ecommunity ecom_sticky;
        struct ecommunity ecom_default_gw;
        struct ecommunity ecom_na;
        struct ecommunity_val eval;
        struct ecommunity_val eval_sticky;
        struct ecommunity_val eval_default_gw;
        struct ecommunity_val eval_rmac;
        struct ecommunity_val eval_na;

        bgp_encap_types tnl_type;
        struct listnode *node, *nnode;
        struct ecommunity *ecom;
        uint32_t seqnum;
        struct list *vrf_export_rtl = NULL;

        /* Encap */
        tnl_type = BGP_ENCAP_TYPE_VXLAN;
        memset(&ecom_encap, 0, sizeof(ecom_encap));
        encode_encap_extcomm(tnl_type, &eval);
        ecom_encap.size = 1;
        ecom_encap.val = (uint8_t *)eval.val;

        /* Add Encap */
        attr->ecommunity = ecommunity_dup(&ecom_encap);

        /* Add the export RTs for L2VNI */
        for (ALL_LIST_ELEMENTS(vpn->export_rtl, node, nnode, ecom))
                attr->ecommunity = ecommunity_merge(attr->ecommunity, ecom);

        /* Add the export RTs for L3VNI if told to - caller determines
         * when this should be done.
         */
        if (add_l3_ecomm) {
                vrf_export_rtl = bgpevpn_get_vrf_export_rtl(vpn);
                if (vrf_export_rtl && !list_isempty(vrf_export_rtl)) {
                        for (ALL_LIST_ELEMENTS(vrf_export_rtl, node, nnode,
                                               ecom))
                                attr->ecommunity = ecommunity_merge(
                                        attr->ecommunity, ecom);
                }
        }

        /* Add MAC mobility (sticky) if needed. */
        if (attr->sticky) {
                seqnum = 0;
                memset(&ecom_sticky, 0, sizeof(ecom_sticky));
                encode_mac_mobility_extcomm(1, seqnum, &eval_sticky);
                ecom_sticky.size = 1;
                ecom_sticky.val = (uint8_t *)eval_sticky.val;
                attr->ecommunity =
                        ecommunity_merge(attr->ecommunity, &ecom_sticky);
        }

        /* Add RMAC, if told to. */
        if (add_l3_ecomm) {
                encode_rmac_extcomm(&eval_rmac, &attr->rmac);
                ecommunity_add_val(attr->ecommunity, &eval_rmac, true, true);
        }

        /* Add default gateway, if needed. */
        if (attr->default_gw) {
                memset(&ecom_default_gw, 0, sizeof(ecom_default_gw));
                encode_default_gw_extcomm(&eval_default_gw);
                ecom_default_gw.size = 1;
                ecom_default_gw.val = (uint8_t *)eval_default_gw.val;
                attr->ecommunity =
                        ecommunity_merge(attr->ecommunity, &ecom_default_gw);
        }

        if (attr->router_flag) {
                memset(&ecom_na, 0, sizeof(ecom_na));
                encode_na_flag_extcomm(&eval_na, attr->router_flag);
                ecom_na.size = 1;
                ecom_na.val = (uint8_t *)eval_na.val;
                attr->ecommunity = ecommunity_merge(attr->ecommunity,
                                                   &ecom_na);
        }

        attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_EXT_COMMUNITIES);
}

/*
 * Add MAC mobility extended community to attribute.
 */
static void add_mac_mobility_to_attr(uint32_t seq_num, struct attr *attr)
{
        struct ecommunity ecom_tmp;
        struct ecommunity_val eval;
        uint8_t *ecom_val_ptr;
        int i;
        uint8_t *pnt;
        int type = 0;
        int sub_type = 0;

        /* Build MM */
        encode_mac_mobility_extcomm(0, seq_num, &eval);

        /* Find current MM ecommunity */
        ecom_val_ptr = NULL;

        if (attr->ecommunity) {
                for (i = 0; i < attr->ecommunity->size; i++) {
                        pnt = attr->ecommunity->val + (i * 8);
                        type = *pnt++;
                        sub_type = *pnt++;

                        if (type == ECOMMUNITY_ENCODE_EVPN
                            && sub_type
                                       == ECOMMUNITY_EVPN_SUBTYPE_MACMOBILITY) {
                                ecom_val_ptr = (uint8_t *)(attr->ecommunity->val
                                                           + (i * 8));
                                break;
                        }
                }
        }

        /* Update the existing MM ecommunity */
        if (ecom_val_ptr) {
                memcpy(ecom_val_ptr, eval.val, sizeof(char) * ECOMMUNITY_SIZE);
        }
        /* Add MM to existing */
        else {
                memset(&ecom_tmp, 0, sizeof(ecom_tmp));
                ecom_tmp.size = 1;
                ecom_tmp.val = (uint8_t *)eval.val;

                if (attr->ecommunity)
                        attr->ecommunity =
                                ecommunity_merge(attr->ecommunity, &ecom_tmp);
                else
                        attr->ecommunity = ecommunity_dup(&ecom_tmp);
        }
}

/* Install EVPN route into zebra. */
static int evpn_zebra_install(struct bgp *bgp, struct bgpevpn *vpn,
                              const struct prefix_evpn *p,
                              struct bgp_path_info *pi)
{
        int ret;
        uint8_t flags;
        int flood_control;

        if (p->prefix.route_type == BGP_EVPN_MAC_IP_ROUTE) {
                flags = 0;
                if (pi->attr->sticky)
                        SET_FLAG(flags, ZEBRA_MACIP_TYPE_STICKY);
                if (pi->attr->default_gw)
                        SET_FLAG(flags, ZEBRA_MACIP_TYPE_GW);
                if (is_evpn_prefix_ipaddr_v6(p) &&
                    pi->attr->router_flag)
                        SET_FLAG(flags, ZEBRA_MACIP_TYPE_ROUTER_FLAG);
                ret = bgp_zebra_send_remote_macip(
                        bgp, vpn, p, pi->attr->nexthop, 1, flags,
                        mac_mobility_seqnum(pi->attr));
        } else {
                switch (pi->attr->pmsi_tnl_type) {
                case PMSI_TNLTYPE_INGR_REPL:
                        flood_control = VXLAN_FLOOD_HEAD_END_REPL;
                        break;

                case PMSI_TNLTYPE_PIM_SM:
                        flood_control = VXLAN_FLOOD_PIM_SM;
                        break;

                default:
                        flood_control = VXLAN_FLOOD_DISABLED;
                        break;
                }
                ret = bgp_zebra_send_remote_vtep(bgp, vpn, p, flood_control, 1);
        }

        return ret;
}

/* Uninstall EVPN route from zebra. */
static int evpn_zebra_uninstall(struct bgp *bgp, struct bgpevpn *vpn,
                                const struct prefix_evpn *p,
                                struct in_addr remote_vtep_ip)
{
        int ret;

        if (p->prefix.route_type == BGP_EVPN_MAC_IP_ROUTE)
                ret = bgp_zebra_send_remote_macip(bgp, vpn, p, remote_vtep_ip,
                                                  0, 0, 0);
        else
                ret = bgp_zebra_send_remote_vtep(bgp, vpn, p,
                                        VXLAN_FLOOD_DISABLED, 0);

        return ret;
}

/*
 * Due to MAC mobility, the prior "local" best route has been supplanted
 * by a "remote" best route. The prior route has to be deleted and withdrawn
 * from peers.
 */
static void evpn_delete_old_local_route(struct bgp *bgp, struct bgpevpn *vpn,
                                        struct bgp_node *rn,
                                        struct bgp_path_info *old_local)
{
        struct bgp_node *global_rn;
        struct bgp_path_info *pi;
        afi_t afi = AFI_L2VPN;
        safi_t safi = SAFI_EVPN;

        /* Locate route node in the global EVPN routing table. Note that
         * this table is a 2-level tree (RD-level + Prefix-level) similar to
         * L3VPN routes.
         */
        global_rn = bgp_afi_node_lookup(bgp->rib[afi][safi], afi, safi,
                                        bgp_node_get_prefix(rn), &vpn->prd);
        if (global_rn) {
                /* Delete route entry in the global EVPN table. */
                delete_evpn_route_entry(bgp, afi, safi, global_rn, &pi);

                /* Schedule for processing - withdraws to peers happen from
                 * this table.
                 */
                if (pi)
                        bgp_process(bgp, global_rn, afi, safi);
                bgp_unlock_node(global_rn);
        }

        /* Delete route entry in the VNI route table, caller to remove. */
        bgp_path_info_delete(rn, old_local);
}

static struct in_addr *es_vtep_new(struct in_addr vtep)
{
        struct in_addr *ip;

        ip = XCALLOC(MTYPE_BGP_EVPN_ES_VTEP, sizeof(struct in_addr));

        ip->s_addr = vtep.s_addr;
        return ip;
}

static void es_vtep_free(struct in_addr *ip)
{
        XFREE(MTYPE_BGP_EVPN_ES_VTEP, ip);
}

/* check if VTEP is already part of the list */
static int is_vtep_present_in_list(struct list *list,
                                   struct in_addr vtep)
{
        struct listnode *node = NULL;
        struct in_addr *tmp;

        for (ALL_LIST_ELEMENTS_RO(list, node, tmp)) {
                if (tmp->s_addr == vtep.s_addr)
                        return 1;
        }
        return 0;
}

/*
 * Best path for ES route was changed,
 * update the list of VTEPs for this ES
 */
static int evpn_es_install_vtep(struct bgp *bgp, struct evpnes *es,
                                const struct prefix_evpn *p,
                                struct in_addr rvtep)
{
        struct in_addr *vtep_ip;

        if (is_vtep_present_in_list(es->vtep_list, rvtep))
                return 0;


        vtep_ip = es_vtep_new(rvtep);
        if (vtep_ip)
                listnode_add_sort(es->vtep_list, vtep_ip);
        return 0;
}

/*
 * Best path for ES route was changed,
 * update the list of VTEPs for this ES
 */
static int evpn_es_uninstall_vtep(struct bgp *bgp,
                                  struct evpnes *es,
                                  struct prefix_evpn *p,
                                  struct in_addr rvtep)
{
        struct listnode *node, *nnode, *node_to_del = NULL;
        struct in_addr *tmp;

        for (ALL_LIST_ELEMENTS(es->vtep_list, node, nnode, tmp)) {
                if (tmp->s_addr == rvtep.s_addr) {
                        es_vtep_free(tmp);
                        node_to_del = node;
                }
        }

        if (node_to_del)
                list_delete_node(es->vtep_list, node_to_del);

        return 0;
}

/*
 * Calculate the best path for a ES(type-4) route.
 */
static int evpn_es_route_select_install(struct bgp *bgp,
                                        struct evpnes *es,
                                        struct bgp_node *rn)
{
        int ret = 0;
        afi_t afi = AFI_L2VPN;
        safi_t safi = SAFI_EVPN;
        struct bgp_path_info *old_select; /* old best */
        struct bgp_path_info *new_select; /* new best */
        struct bgp_path_info_pair old_and_new;

        /* Compute the best path. */
        bgp_best_selection(bgp, rn, &bgp->maxpaths[afi][safi],
                           &old_and_new, afi, safi);
        old_select = old_and_new.old;
        new_select = old_and_new.new;

        /*
         * If the best path hasn't changed - see if something needs to be
         * updated
         */
        if (old_select && old_select == new_select
            && old_select->type == ZEBRA_ROUTE_BGP
            && old_select->sub_type == BGP_ROUTE_IMPORTED
            && !CHECK_FLAG(rn->flags, BGP_NODE_USER_CLEAR)
            && !CHECK_FLAG(old_select->flags, BGP_PATH_ATTR_CHANGED)
            && !bgp_addpath_is_addpath_used(&bgp->tx_addpath, afi, safi)) {
                if (bgp_zebra_has_route_changed(rn, old_select)) {
                        ret = evpn_es_install_vtep(bgp, es,
                                                   (const struct prefix_evpn *)bgp_node_get_prefix(rn),
                                                   old_select->attr->nexthop);
                }
                UNSET_FLAG(old_select->flags, BGP_PATH_MULTIPATH_CHG);
                UNSET_FLAG(old_select->flags, BGP_PATH_LINK_BW_CHG);
                bgp_zebra_clear_route_change_flags(rn);
                return ret;
        }

        /* If the user did a "clear" this flag will be set */
        UNSET_FLAG(rn->flags, BGP_NODE_USER_CLEAR);

        /*
         * bestpath has changed; update relevant fields and install or uninstall
         * into the zebra RIB.
         */
        if (old_select || new_select)
                bgp_bump_version(rn);

        if (old_select)
                bgp_path_info_unset_flag(rn, old_select, BGP_PATH_SELECTED);
        if (new_select) {
                bgp_path_info_set_flag(rn, new_select, BGP_PATH_SELECTED);
                bgp_path_info_unset_flag(rn, new_select, BGP_PATH_ATTR_CHANGED);
                UNSET_FLAG(new_select->flags, BGP_PATH_MULTIPATH_CHG);
                UNSET_FLAG(new_select->flags, BGP_PATH_LINK_BW_CHG);
        }

        if (new_select && new_select->type == ZEBRA_ROUTE_BGP
            && new_select->sub_type == BGP_ROUTE_IMPORTED) {
                ret = evpn_es_install_vtep(bgp, es,
                                           (const struct prefix_evpn *)bgp_node_get_prefix(rn),
                                           new_select->attr->nexthop);
        } else {
                if (old_select && old_select->type == ZEBRA_ROUTE_BGP
                    && old_select->sub_type == BGP_ROUTE_IMPORTED)
                        ret = evpn_es_uninstall_vtep(
                                bgp, es, (struct prefix_evpn *)bgp_node_get_prefix(rn),
                                old_select->attr->nexthop);
        }

        /* Clear any route change flags. */
        bgp_zebra_clear_route_change_flags(rn);

        /* Reap old select bgp_path_info, if it has been removed */
        if (old_select && CHECK_FLAG(old_select->flags, BGP_PATH_REMOVED))
                bgp_path_info_reap(rn, old_select);

        return ret;
}

/*
 * Calculate the best path for an EVPN route. Install/update best path in zebra,
 * if appropriate.
 */
static int evpn_route_select_install(struct bgp *bgp, struct bgpevpn *vpn,
                                     struct bgp_node *rn)
{
        struct bgp_path_info *old_select, *new_select;
        struct bgp_path_info_pair old_and_new;
        afi_t afi = AFI_L2VPN;
        safi_t safi = SAFI_EVPN;
        int ret = 0;

        /* Compute the best path. */
        bgp_best_selection(bgp, rn, &bgp->maxpaths[afi][safi], &old_and_new,
                           afi, safi);
        old_select = old_and_new.old;
        new_select = old_and_new.new;

        /* If the best path hasn't changed - see if there is still something to
         * update
         * to zebra RIB.
         */
        if (old_select && old_select == new_select
            && old_select->type == ZEBRA_ROUTE_BGP
            && old_select->sub_type == BGP_ROUTE_IMPORTED
            && !CHECK_FLAG(rn->flags, BGP_NODE_USER_CLEAR)
            && !CHECK_FLAG(old_select->flags, BGP_PATH_ATTR_CHANGED)
            && !bgp_addpath_is_addpath_used(&bgp->tx_addpath, afi, safi)) {
                if (bgp_zebra_has_route_changed(rn, old_select))
                        ret = evpn_zebra_install(
                                bgp, vpn, (const struct prefix_evpn *)bgp_node_get_prefix(rn),
                                old_select);
                UNSET_FLAG(old_select->flags, BGP_PATH_MULTIPATH_CHG);
                UNSET_FLAG(old_select->flags, BGP_PATH_LINK_BW_CHG);
                bgp_zebra_clear_route_change_flags(rn);
                return ret;
        }

        /* If the user did a "clear" this flag will be set */
        UNSET_FLAG(rn->flags, BGP_NODE_USER_CLEAR);

        /* bestpath has changed; update relevant fields and install or uninstall
         * into the zebra RIB.
         */
        if (old_select || new_select)
                bgp_bump_version(rn);

        if (old_select)
                bgp_path_info_unset_flag(rn, old_select, BGP_PATH_SELECTED);
        if (new_select) {
                bgp_path_info_set_flag(rn, new_select, BGP_PATH_SELECTED);
                bgp_path_info_unset_flag(rn, new_select, BGP_PATH_ATTR_CHANGED);
                UNSET_FLAG(new_select->flags, BGP_PATH_MULTIPATH_CHG);
                UNSET_FLAG(new_select->flags, BGP_PATH_LINK_BW_CHG);
        }

        if (new_select && new_select->type == ZEBRA_ROUTE_BGP
            && new_select->sub_type == BGP_ROUTE_IMPORTED) {
                ret = evpn_zebra_install(
                        bgp, vpn, (struct prefix_evpn *)bgp_node_get_prefix(rn),
                        new_select);

                /* If an old best existed and it was a "local" route, the only
                 * reason
                 * it would be supplanted is due to MAC mobility procedures. So,
                 * we
                 * need to do an implicit delete and withdraw that route from
                 * peers.
                 */
                if (old_select && old_select->peer == bgp->peer_self
                    && old_select->type == ZEBRA_ROUTE_BGP
                    && old_select->sub_type == BGP_ROUTE_STATIC)
                        evpn_delete_old_local_route(bgp, vpn, rn, old_select);
        } else {
                if (old_select && old_select->type == ZEBRA_ROUTE_BGP
                    && old_select->sub_type == BGP_ROUTE_IMPORTED)
                        ret = evpn_zebra_uninstall(
                                bgp, vpn,
                                (const struct prefix_evpn *)bgp_node_get_prefix(
                                        rn),
                                old_select->attr->nexthop);
        }

        /* Clear any route change flags. */
        bgp_zebra_clear_route_change_flags(rn);

        /* Reap old select bgp_path_info, if it has been removed */
        if (old_select && CHECK_FLAG(old_select->flags, BGP_PATH_REMOVED))
                bgp_path_info_reap(rn, old_select);

        return ret;
}

/*
 * Return true if the local ri for this rn is of type gateway mac
 */
static int evpn_route_is_def_gw(struct bgp *bgp, struct bgp_node *rn)
{
        struct bgp_path_info *tmp_pi = NULL;
        struct bgp_path_info *local_pi = NULL;

        local_pi = NULL;
        for (tmp_pi = bgp_node_get_bgp_path_info(rn); tmp_pi;
             tmp_pi = tmp_pi->next) {
                if (tmp_pi->peer == bgp->peer_self
                    && tmp_pi->type == ZEBRA_ROUTE_BGP
                    && tmp_pi->sub_type == BGP_ROUTE_STATIC)
                        local_pi = tmp_pi;
        }

        if (!local_pi)
                return 0;

        return local_pi->attr->default_gw;
}


/*
 * Return true if the local ri for this rn has sticky set
 */
static int evpn_route_is_sticky(struct bgp *bgp, struct bgp_node *rn)
{
        struct bgp_path_info *tmp_pi;
        struct bgp_path_info *local_pi;

        local_pi = NULL;
        for (tmp_pi = bgp_node_get_bgp_path_info(rn); tmp_pi;
             tmp_pi = tmp_pi->next) {
                if (tmp_pi->peer == bgp->peer_self
                    && tmp_pi->type == ZEBRA_ROUTE_BGP
                    && tmp_pi->sub_type == BGP_ROUTE_STATIC)
                        local_pi = tmp_pi;
        }

        if (!local_pi)
                return 0;

        return local_pi->attr->sticky;
}

/*
 * create or update EVPN type4 route entry.
 * This could be in the ES table or the global table.
 * TODO: handle remote ES (type4) routes as well
 */
static int update_evpn_type4_route_entry(struct bgp *bgp, struct evpnes *es,
                                         afi_t afi, safi_t safi,
                                         struct bgp_node *rn, struct attr *attr,
                                         int add, struct bgp_path_info **ri,
                                         int *route_changed)
{
        char buf[ESI_STR_LEN];
        char buf1[INET6_ADDRSTRLEN];
        struct bgp_path_info *tmp_pi = NULL;
        struct bgp_path_info *local_pi = NULL;  /* local route entry if any */
        struct bgp_path_info *remote_pi = NULL; /* remote route entry if any */
        struct attr *attr_new = NULL;
        const struct prefix_evpn *evp = NULL;

        *ri = NULL;
        *route_changed = 1;
        evp = (const struct prefix_evpn *)bgp_node_get_prefix(rn);

        /* locate the local and remote entries if any */
        for (tmp_pi = bgp_node_get_bgp_path_info(rn); tmp_pi;
             tmp_pi = tmp_pi->next) {
                if (tmp_pi->peer == bgp->peer_self
                    && tmp_pi->type == ZEBRA_ROUTE_BGP
                    && tmp_pi->sub_type == BGP_ROUTE_STATIC)
                        local_pi = tmp_pi;
                if (tmp_pi->type == ZEBRA_ROUTE_BGP
                    && tmp_pi->sub_type == BGP_ROUTE_IMPORTED
                    && CHECK_FLAG(tmp_pi->flags, BGP_PATH_VALID))
                        remote_pi = tmp_pi;
        }

        /* we don't expect to see a remote_ri at this point.
         * An ES route has esi + vtep_ip as the key,
         * We shouldn't see the same route from any other vtep.
         */
        if (remote_pi) {
                flog_err(
                        EC_BGP_ES_INVALID,
                        "%u ERROR: local es route for ESI: %s Vtep %s also learnt from remote",
                        bgp->vrf_id,
                        esi_to_str(&evp->prefix.es_addr.esi, buf, sizeof(buf)),
                        ipaddr2str(&es->originator_ip, buf1, sizeof(buf1)));
                return -1;
        }

        if (!local_pi && !add)
                return 0;

        /* create or update the entry */
        if (!local_pi) {

                /* Add or update attribute to hash */
                attr_new = bgp_attr_intern(attr);

                /* Create new route with its attribute. */
                tmp_pi = info_make(ZEBRA_ROUTE_BGP, BGP_ROUTE_STATIC, 0,
                                   bgp->peer_self, attr_new, rn);
                SET_FLAG(tmp_pi->flags, BGP_PATH_VALID);

                /* add the newly created path to the route-node */
                bgp_path_info_add(rn, tmp_pi);
        } else {
                tmp_pi = local_pi;
                if (attrhash_cmp(tmp_pi->attr, attr)
                    && !CHECK_FLAG(tmp_pi->flags, BGP_PATH_REMOVED))
                        *route_changed = 0;
                else {
                        /* The attribute has changed.
                         * Add (or update) attribute to hash. */
                        attr_new = bgp_attr_intern(attr);
                        bgp_path_info_set_flag(rn, tmp_pi,
                                               BGP_PATH_ATTR_CHANGED);

                        /* Restore route, if needed. */
                        if (CHECK_FLAG(tmp_pi->flags, BGP_PATH_REMOVED))
                                bgp_path_info_restore(rn, tmp_pi);

                        /* Unintern existing, set to new. */
                        bgp_attr_unintern(&tmp_pi->attr);
                        tmp_pi->attr = attr_new;
                        tmp_pi->uptime = bgp_clock();
                }
        }

        /* Return back the route entry. */
        *ri = tmp_pi;
        return 0;
}

/* update evpn es (type-4) route */
static int update_evpn_type4_route(struct bgp *bgp,
                                   struct evpnes *es,
                                   struct prefix_evpn *p)
{
        int ret = 0;
        int route_changed = 0;
        char buf[ESI_STR_LEN];
        char buf1[INET6_ADDRSTRLEN];
        afi_t afi = AFI_L2VPN;
        safi_t safi = SAFI_EVPN;
        struct attr attr;
        struct attr *attr_new = NULL;
        struct bgp_node *rn = NULL;
        struct bgp_path_info *pi = NULL;

        memset(&attr, 0, sizeof(struct attr));

        /* Build path-attribute for this route. */
        bgp_attr_default_set(&attr, BGP_ORIGIN_IGP);
        attr.nexthop = es->originator_ip.ipaddr_v4;
        attr.mp_nexthop_global_in = es->originator_ip.ipaddr_v4;
        attr.mp_nexthop_len = BGP_ATTR_NHLEN_IPV4;

        /* Set up extended community. */
        build_evpn_type4_route_extcomm(es, &attr);

        /* First, create (or fetch) route node within the ESI. */
        /* NOTE: There is no RD here. */
        rn = bgp_node_get(es->route_table, (struct prefix *)p);

        /* Create or update route entry. */
        ret = update_evpn_type4_route_entry(bgp, es, afi, safi, rn, &attr, 1,
                                            &pi, &route_changed);
        if (ret != 0) {
                flog_err(EC_BGP_ES_INVALID,
                         "%u ERROR: Failed to updated ES route ESI: %s VTEP %s",
                         bgp->vrf_id,
                         esi_to_str(&p->prefix.es_addr.esi, buf, sizeof(buf)),
                         ipaddr2str(&es->originator_ip, buf1, sizeof(buf1)));
        }

        assert(pi);
        attr_new = pi->attr;

        /* Perform route selection;
         * this is just to set the flags correctly
         * as local route in the ES always wins.
         */
        evpn_es_route_select_install(bgp, es, rn);
        bgp_unlock_node(rn);

        /* If this is a new route or some attribute has changed, export the
         * route to the global table. The route will be advertised to peers
         * from there. Note that this table is a 2-level tree (RD-level +
         * Prefix-level) similar to L3VPN routes.
         */
        if (route_changed) {
                struct bgp_path_info *global_pi;

                rn = bgp_afi_node_get(bgp->rib[afi][safi], afi, safi,
                                      (struct prefix *)p, &es->prd);
                update_evpn_type4_route_entry(bgp, es, afi, safi, rn, attr_new,
                                              1, &global_pi, &route_changed);

                /* Schedule for processing and unlock node. */
                bgp_process(bgp, rn, afi, safi);
                bgp_unlock_node(rn);
        }

        /* Unintern temporary. */
        aspath_unintern(&attr.aspath);
        return 0;
}

static int update_evpn_type5_route_entry(struct bgp *bgp_evpn,
                                         struct bgp *bgp_vrf, afi_t afi,
                                         safi_t safi, struct bgp_node *rn,
                                         struct attr *attr, int *route_changed)
{
        struct attr *attr_new = NULL;
        struct bgp_path_info *pi = NULL;
        mpls_label_t label = MPLS_INVALID_LABEL;
        struct bgp_path_info *local_pi = NULL;
        struct bgp_path_info *tmp_pi = NULL;

        *route_changed = 0;
        /* locate the local route entry if any */
        for (tmp_pi = bgp_node_get_bgp_path_info(rn); tmp_pi;
             tmp_pi = tmp_pi->next) {
                if (tmp_pi->peer == bgp_evpn->peer_self
                    && tmp_pi->type == ZEBRA_ROUTE_BGP
                    && tmp_pi->sub_type == BGP_ROUTE_STATIC)
                        local_pi = tmp_pi;
        }

        /*
         * create a new route entry if one doesn't exist.
         * Otherwise see if route attr has changed
         */
        if (!local_pi) {

                /* route has changed as this is the first entry */
                *route_changed = 1;

                /* Add (or update) attribute to hash. */
                attr_new = bgp_attr_intern(attr);

                /* create the route info from attribute */
                pi = info_make(ZEBRA_ROUTE_BGP, BGP_ROUTE_STATIC, 0,
                               bgp_evpn->peer_self, attr_new, rn);
                SET_FLAG(pi->flags, BGP_PATH_VALID);

                /* Type-5 routes advertise the L3-VNI */
                bgp_path_info_extra_get(pi);
                vni2label(bgp_vrf->l3vni, &label);
                memcpy(&pi->extra->label, &label, sizeof(label));
                pi->extra->num_labels = 1;

                /* add the route entry to route node*/
                bgp_path_info_add(rn, pi);
        } else {

                tmp_pi = local_pi;
                if (!attrhash_cmp(tmp_pi->attr, attr)) {

                        /* attribute changed */
                        *route_changed = 1;

                        /* The attribute has changed. */
                        /* Add (or update) attribute to hash. */
                        attr_new = bgp_attr_intern(attr);
                        bgp_path_info_set_flag(rn, tmp_pi,
                                               BGP_PATH_ATTR_CHANGED);

                        /* Restore route, if needed. */
                        if (CHECK_FLAG(tmp_pi->flags, BGP_PATH_REMOVED))
                                bgp_path_info_restore(rn, tmp_pi);

                        /* Unintern existing, set to new. */
                        bgp_attr_unintern(&tmp_pi->attr);
                        tmp_pi->attr = attr_new;
                        tmp_pi->uptime = bgp_clock();
                }
        }
        return 0;
}

/* update evpn type-5 route entry */
static int update_evpn_type5_route(struct bgp *bgp_vrf, struct prefix_evpn *evp,
                                   struct attr *src_attr)
{
        afi_t afi = AFI_L2VPN;
        safi_t safi = SAFI_EVPN;
        struct attr attr;
        struct bgp_node *rn = NULL;
        struct bgp *bgp_evpn = NULL;
        int route_changed = 0;

        bgp_evpn = bgp_get_evpn();
        if (!bgp_evpn)
                return 0;

        /* Build path attribute for this route - use the source attr, if
         * present, else treat as locally originated.
         */
        if (src_attr)
                attr = *src_attr;
        else {
                memset(&attr, 0, sizeof(struct attr));
                bgp_attr_default_set(&attr, BGP_ORIGIN_IGP);
        }

        /* Advertise Primary IP (PIP) is enabled, send individual
         * IP (default instance router-id) as nexthop.
         * PIP is disabled or vrr interface is not present
         * use anycast-IP as nexthop and anycast RMAC.
         */
        if (!bgp_vrf->evpn_info->advertise_pip ||
            (!bgp_vrf->evpn_info->is_anycast_mac)) {
                attr.nexthop = bgp_vrf->originator_ip;
                attr.mp_nexthop_global_in = bgp_vrf->originator_ip;
                memcpy(&attr.rmac, &bgp_vrf->rmac, ETH_ALEN);
        } else {
                /* copy sys rmac */
                memcpy(&attr.rmac, &bgp_vrf->evpn_info->pip_rmac, ETH_ALEN);
                if (bgp_vrf->evpn_info->pip_ip.s_addr != INADDR_ANY) {
                        attr.nexthop = bgp_vrf->evpn_info->pip_ip;
                        attr.mp_nexthop_global_in = bgp_vrf->evpn_info->pip_ip;
                } else if (bgp_vrf->evpn_info->pip_ip.s_addr == INADDR_ANY)
                        if (bgp_debug_zebra(NULL)) {
                                char buf1[PREFIX_STRLEN];

                                zlog_debug("VRF %s evp %s advertise-pip primary ip is not configured",
                                           vrf_id_to_name(bgp_vrf->vrf_id),
                                           prefix2str(evp, buf1, sizeof(buf1)));
                        }
        }

        if (bgp_debug_zebra(NULL)) {
                char buf[ETHER_ADDR_STRLEN];
                char buf1[PREFIX_STRLEN];
                char buf2[INET6_ADDRSTRLEN];

                zlog_debug("VRF %s type-5 route evp %s RMAC %s nexthop %s",
                           vrf_id_to_name(bgp_vrf->vrf_id),
                           prefix2str(evp, buf1, sizeof(buf1)),
                           prefix_mac2str(&attr.rmac, buf, sizeof(buf)),
                           inet_ntop(AF_INET, &attr.nexthop, buf2,
                                     INET_ADDRSTRLEN));
        }

        attr.mp_nexthop_len = BGP_ATTR_NHLEN_IPV4;

        /* Setup RT and encap extended community */
        build_evpn_type5_route_extcomm(bgp_vrf, &attr);

        /* get the route node in global table */
        rn = bgp_afi_node_get(bgp_evpn->rib[afi][safi], afi, safi,
                              (struct prefix *)evp, &bgp_vrf->vrf_prd);
        assert(rn);

        /* create or update the route entry within the route node */
        update_evpn_type5_route_entry(bgp_evpn, bgp_vrf, afi, safi, rn, &attr,
                                      &route_changed);

        /* schedule for processing and unlock node */
        if (route_changed) {
                bgp_process(bgp_evpn, rn, afi, safi);
                bgp_unlock_node(rn);
        }

        /* uninten temporary */
        if (!src_attr)
                aspath_unintern(&attr.aspath);
        return 0;
}

/*
 * Create or update EVPN route entry. This could be in the VNI route table
 * or the global route table.
 */
static int update_evpn_route_entry(struct bgp *bgp, struct bgpevpn *vpn,
                                   afi_t afi, safi_t safi, struct bgp_node *rn,
                                   struct attr *attr, int add,
                                   struct bgp_path_info **pi, uint8_t flags,
                                   uint32_t seq)
{
        struct bgp_path_info *tmp_pi;
        struct bgp_path_info *local_pi;
        struct attr *attr_new;
        mpls_label_t label[BGP_MAX_LABELS];
        uint32_t num_labels = 1;
        int route_change = 1;
        uint8_t sticky = 0;
        const struct prefix_evpn *evp;

        *pi = NULL;
        evp = (const struct prefix_evpn *)bgp_node_get_prefix(rn);
        memset(&label, 0, sizeof(label));

        /* See if this is an update of an existing route, or a new add. */
        local_pi = NULL;
        for (tmp_pi = bgp_node_get_bgp_path_info(rn); tmp_pi;
             tmp_pi = tmp_pi->next) {
                if (tmp_pi->peer == bgp->peer_self
                    && tmp_pi->type == ZEBRA_ROUTE_BGP
                    && tmp_pi->sub_type == BGP_ROUTE_STATIC)
                        local_pi = tmp_pi;
        }

        /* If route doesn't exist already, create a new one, if told to.
         * Otherwise act based on whether the attributes of the route have
         * changed or not.
         */
        if (!local_pi && !add)
                return 0;

        /* For non-GW MACs, update MAC mobility seq number, if needed. */
        if (seq && !CHECK_FLAG(flags, ZEBRA_MACIP_TYPE_GW))
                add_mac_mobility_to_attr(seq, attr);

        if (!local_pi) {
                /* Add (or update) attribute to hash. */
                attr_new = bgp_attr_intern(attr);

                /* Extract MAC mobility sequence number, if any. */
                attr_new->mm_seqnum =
                        bgp_attr_mac_mobility_seqnum(attr_new, &sticky);
                attr_new->sticky = sticky;

                /* Create new route with its attribute. */
                tmp_pi = info_make(ZEBRA_ROUTE_BGP, BGP_ROUTE_STATIC, 0,
                                   bgp->peer_self, attr_new, rn);
                SET_FLAG(tmp_pi->flags, BGP_PATH_VALID);
                bgp_path_info_extra_get(tmp_pi);

                /* The VNI goes into the 'label' field of the route */
                vni2label(vpn->vni, &label[0]);

                /* Type-2 routes may carry a second VNI - the L3-VNI.
                 * Only attach second label if we are advertising two labels for
                 * type-2 routes.
                 */
                if (evp->prefix.route_type == BGP_EVPN_MAC_IP_ROUTE
                    && CHECK_FLAG(vpn->flags, VNI_FLAG_USE_TWO_LABELS)) {
                        vni_t l3vni;

                        l3vni = bgpevpn_get_l3vni(vpn);
                        if (l3vni) {
                                vni2label(l3vni, &label[1]);
                                num_labels++;
                        }
                }

                memcpy(&tmp_pi->extra->label, label, sizeof(label));
                tmp_pi->extra->num_labels = num_labels;
                /* Mark route as self type-2 route */
                if (flags && CHECK_FLAG(flags, ZEBRA_MACIP_TYPE_SVI_IP))
                        tmp_pi->extra->af_flags = BGP_EVPN_MACIP_TYPE_SVI_IP;
                bgp_path_info_add(rn, tmp_pi);
        } else {
                tmp_pi = local_pi;
                if (attrhash_cmp(tmp_pi->attr, attr)
                    && !CHECK_FLAG(tmp_pi->flags, BGP_PATH_REMOVED))
                        route_change = 0;
                else {
                        /*
                         * The attributes have changed, type-2 routes needs to
                         * be advertised with right labels.
                         */
                        vni2label(vpn->vni, &label[0]);
                        if (evp->prefix.route_type == BGP_EVPN_MAC_IP_ROUTE
                            && CHECK_FLAG(vpn->flags,
                                          VNI_FLAG_USE_TWO_LABELS)) {
                                vni_t l3vni;

                                l3vni = bgpevpn_get_l3vni(vpn);
                                if (l3vni) {
                                        vni2label(l3vni, &label[1]);
                                        num_labels++;
                                }
                        }
                        memcpy(&tmp_pi->extra->label, label, sizeof(label));
                        tmp_pi->extra->num_labels = num_labels;

                        /* The attribute has changed. */
                        /* Add (or update) attribute to hash. */
                        attr_new = bgp_attr_intern(attr);
                        bgp_path_info_set_flag(rn, tmp_pi,
                                               BGP_PATH_ATTR_CHANGED);

                        /* Extract MAC mobility sequence number, if any. */
                        attr_new->mm_seqnum =
                                bgp_attr_mac_mobility_seqnum(attr_new, &sticky);
                        attr_new->sticky = sticky;

                        /* Restore route, if needed. */
                        if (CHECK_FLAG(tmp_pi->flags, BGP_PATH_REMOVED))
                                bgp_path_info_restore(rn, tmp_pi);

                        /* Unintern existing, set to new. */
                        bgp_attr_unintern(&tmp_pi->attr);
                        tmp_pi->attr = attr_new;
                        tmp_pi->uptime = bgp_clock();
                }
        }

        /* Return back the route entry. */
        *pi = tmp_pi;
        return route_change;
}

static void evpn_zebra_reinstall_best_route(struct bgp *bgp,
                struct bgpevpn *vpn, struct bgp_node *rn)
{
        struct bgp_path_info *tmp_ri;
        struct bgp_path_info *curr_select = NULL;

        for (tmp_ri = bgp_node_get_bgp_path_info(rn);
             tmp_ri; tmp_ri = tmp_ri->next) {
                if (CHECK_FLAG(tmp_ri->flags, BGP_PATH_SELECTED)) {
                        curr_select = tmp_ri;
                        break;
                }
        }

        if (curr_select && curr_select->type == ZEBRA_ROUTE_BGP
                        && curr_select->sub_type == BGP_ROUTE_IMPORTED)
                evpn_zebra_install(bgp, vpn,
                                   (const struct prefix_evpn *)bgp_node_get_prefix(rn),
                                   curr_select);
}

/*
 * If the local route was not selected evict it and tell zebra to re-add
 * the best remote dest.
 *
 * Typically a local path added by zebra is expected to be selected as
 * best. In which case when a remote path wins as best (later)
 * evpn_route_select_install itself evicts the older-local-best path.
 *
 * However if bgp's add and zebra's add cross paths (race condition) it
 * is possible that the local path is no longer the "older" best path.
 * It is a path that was never designated as best and hence requires
 * additional handling to prevent bgp from injecting and holding on to a
 * non-best local path.
 */
static void evpn_cleanup_local_non_best_route(struct bgp *bgp,
                                              struct bgpevpn *vpn,
                                              struct bgp_node *rn,
                                              struct bgp_path_info *local_pi)
{
        /* local path was not picked as the winner; kick it out */
        if (bgp_debug_zebra(NULL))
                zlog_debug("evicting local evpn prefix %pRN as remote won", rn);

        evpn_delete_old_local_route(bgp, vpn, rn, local_pi);
        bgp_path_info_reap(rn, local_pi);

        /* tell zebra to re-add the best remote path */
        evpn_zebra_reinstall_best_route(bgp, vpn, rn);
}

/*
 * Create or update EVPN route (of type based on prefix) for specified VNI
 * and schedule for processing.
 */
static int update_evpn_route(struct bgp *bgp, struct bgpevpn *vpn,
                             struct prefix_evpn *p, uint8_t flags,
                             uint32_t seq)
{
        struct bgp_node *rn;
        struct attr attr;
        struct attr *attr_new;
        int add_l3_ecomm = 0;
        struct bgp_path_info *pi;
        afi_t afi = AFI_L2VPN;
        safi_t safi = SAFI_EVPN;
        int route_change;

        memset(&attr, 0, sizeof(struct attr));

        /* Build path-attribute for this route. */
        bgp_attr_default_set(&attr, BGP_ORIGIN_IGP);
        attr.nexthop = vpn->originator_ip;
        attr.mp_nexthop_global_in = vpn->originator_ip;
        attr.mp_nexthop_len = BGP_ATTR_NHLEN_IPV4;
        attr.sticky = CHECK_FLAG(flags, ZEBRA_MACIP_TYPE_STICKY) ? 1 : 0;
        attr.default_gw = CHECK_FLAG(flags, ZEBRA_MACIP_TYPE_GW) ? 1 : 0;
        attr.router_flag = CHECK_FLAG(flags,
                                      ZEBRA_MACIP_TYPE_ROUTER_FLAG) ? 1 : 0;

        /* PMSI is only needed for type-3 routes */
        if (p->prefix.route_type == BGP_EVPN_IMET_ROUTE) {
                attr.flag |= ATTR_FLAG_BIT(BGP_ATTR_PMSI_TUNNEL);
                attr.pmsi_tnl_type = PMSI_TNLTYPE_INGR_REPL;
        }

        /* router mac is only needed for type-2 routes here. */
        if (p->prefix.route_type == BGP_EVPN_MAC_IP_ROUTE) {
                uint8_t af_flags = 0;

                if (CHECK_FLAG(flags, ZEBRA_MACIP_TYPE_SVI_IP))
                        SET_FLAG(af_flags, BGP_EVPN_MACIP_TYPE_SVI_IP);

                bgp_evpn_get_rmac_nexthop(vpn, p, &attr, af_flags);

                if (bgp_debug_zebra(NULL)) {
                        char buf[ETHER_ADDR_STRLEN];
                        char buf1[PREFIX_STRLEN];

                        zlog_debug("VRF %s vni %u type-2 route evp %s RMAC %s nexthop %s",
                                   vpn->bgp_vrf ?
                                   vrf_id_to_name(vpn->bgp_vrf->vrf_id) : " ",
                                   vpn->vni,
                                   prefix2str(p, buf1, sizeof(buf1)),
                                   prefix_mac2str(&attr.rmac, buf,
                                                  sizeof(buf)),
                                   inet_ntoa(attr.mp_nexthop_global_in));
                }
        }

        vni2label(vpn->vni, &(attr.label));

        /* Include L3 VNI related RTs and RMAC for type-2 routes, if they're
         * IPv4 or IPv6 global addresses and we're advertising L3VNI with
         * these routes.
         */
        if (p->prefix.route_type == BGP_EVPN_MAC_IP_ROUTE &&
            (is_evpn_prefix_ipaddr_v4(p) ||
             !IN6_IS_ADDR_LINKLOCAL(&p->prefix.macip_addr.ip.ipaddr_v6)) &&
            CHECK_FLAG(vpn->flags, VNI_FLAG_USE_TWO_LABELS) &&
            bgpevpn_get_l3vni(vpn))
                add_l3_ecomm = 1;

        /* Set up extended community. */
        build_evpn_route_extcomm(vpn, &attr, add_l3_ecomm);

        /* First, create (or fetch) route node within the VNI. */
        /* NOTE: There is no RD here. */
        rn = bgp_node_get(vpn->route_table, (struct prefix *)p);

        /* Create or update route entry. */
        route_change = update_evpn_route_entry(bgp, vpn, afi, safi, rn, &attr,
                                               1, &pi, flags, seq);
        assert(pi);
        attr_new = pi->attr;

        /* lock ri to prevent freeing in evpn_route_select_install */
        bgp_path_info_lock(pi);

       /* Perform route selection. Normally, the local route in the
        * VNI is expected to win and be the best route. However, if
        * there is a race condition where a host moved from local to
        * remote and the remote route was received in BGP just prior
        * to the local MACIP notification from zebra, the remote
        * route would win, and we should evict the defunct local route
        * and (re)install the remote route into zebra.
        */
        evpn_route_select_install(bgp, vpn, rn);
        /*
         * If the new local route was not selected evict it and tell zebra
         * to re-add the best remote dest. BGP doesn't retain non-best local
         * routes.
         */
        if (!CHECK_FLAG(pi->flags, BGP_PATH_SELECTED)) {
                route_change = 0;
                evpn_cleanup_local_non_best_route(bgp, vpn, rn, pi);
        }
        bgp_path_info_unlock(pi);

        bgp_unlock_node(rn);

        /* If this is a new route or some attribute has changed, export the
         * route to the global table. The route will be advertised to peers
         * from there. Note that this table is a 2-level tree (RD-level +
         * Prefix-level) similar to L3VPN routes.
         */
        if (route_change) {
                struct bgp_path_info *global_pi;

                rn = bgp_afi_node_get(bgp->rib[afi][safi], afi, safi,
                                      (struct prefix *)p, &vpn->prd);
                update_evpn_route_entry(bgp, vpn, afi, safi, rn, attr_new, 1,
                                        &global_pi, flags, seq);

                /* Schedule for processing and unlock node. */
                bgp_process(bgp, rn, afi, safi);
                bgp_unlock_node(rn);
        }

        /* Unintern temporary. */
        aspath_unintern(&attr.aspath);

        return 0;
}

/*
 * Delete EVPN route entry.
 * The entry can be in ESI/VNI table or the global table.
 */
static void delete_evpn_route_entry(struct bgp *bgp, afi_t afi, safi_t safi,
                                    struct bgp_node *rn,
                                    struct bgp_path_info **pi)
{
        struct bgp_path_info *tmp_pi;

        *pi = NULL;

        /* Now, find matching route. */
        for (tmp_pi = bgp_node_get_bgp_path_info(rn); tmp_pi;
             tmp_pi = tmp_pi->next)
                if (tmp_pi->peer == bgp->peer_self
                    && tmp_pi->type == ZEBRA_ROUTE_BGP
                    && tmp_pi->sub_type == BGP_ROUTE_STATIC)
                        break;

        *pi = tmp_pi;

        /* Mark route for delete. */
        if (tmp_pi)
                bgp_path_info_delete(rn, tmp_pi);
}



/* Delete EVPN ES (type-4) route */
static int delete_evpn_type4_route(struct bgp *bgp,
                                   struct evpnes *es,
                                   struct prefix_evpn *p)
{
        afi_t afi = AFI_L2VPN;
        safi_t safi = SAFI_EVPN;
        struct bgp_path_info *pi;
        struct bgp_node *rn = NULL; /* rn in esi table */
        struct bgp_node *global_rn = NULL; /* rn in global table */

        /* First, locate the route node within the ESI.
         * If it doesn't exist, ther is nothing to do.
         * Note: there is no RD here.
         */
        rn = bgp_node_lookup(es->route_table, (struct prefix *)p);
        if (!rn)
                return 0;

        /* Next, locate route node in the global EVPN routing table.
         * Note that this table is a 2-level tree (RD-level + Prefix-level)
         */
        global_rn = bgp_afi_node_lookup(bgp->rib[afi][safi], afi, safi,
                                        (struct prefix *)p, &es->prd);
        if (global_rn) {

                /* Delete route entry in the global EVPN table. */
                delete_evpn_route_entry(bgp, afi, safi, global_rn, &pi);

                /* Schedule for processing - withdraws to peers happen from
                 * this table.
                 */
                if (pi)
                        bgp_process(bgp, global_rn, afi, safi);
                bgp_unlock_node(global_rn);
        }

        /*
         * Delete route entry in the ESI route table.
         * This can just be removed.
         */
        delete_evpn_route_entry(bgp, afi, safi, rn, &pi);
        if (pi)
                bgp_path_info_reap(rn, pi);
        bgp_unlock_node(rn);
        return 0;
}

/* Delete EVPN type5 route */
static int delete_evpn_type5_route(struct bgp *bgp_vrf, struct prefix_evpn *evp)
{
        afi_t afi = AFI_L2VPN;
        safi_t safi = SAFI_EVPN;
        struct bgp_node *rn = NULL;
        struct bgp_path_info *pi = NULL;
        struct bgp *bgp_evpn = NULL; /* evpn bgp instance */

        bgp_evpn = bgp_get_evpn();
        if (!bgp_evpn)
                return 0;

        /* locate the global route entry for this type-5 prefix */
        rn = bgp_afi_node_lookup(bgp_evpn->rib[afi][safi], afi, safi,
                                 (struct prefix *)evp, &bgp_vrf->vrf_prd);
        if (!rn)
                return 0;

        delete_evpn_route_entry(bgp_evpn, afi, safi, rn, &pi);
        if (pi)
                bgp_process(bgp_evpn, rn, afi, safi);
        bgp_unlock_node(rn);
        return 0;
}

/*
 * Delete EVPN route (of type based on prefix) for specified VNI and
 * schedule for processing.
 */
static int delete_evpn_route(struct bgp *bgp, struct bgpevpn *vpn,
                             struct prefix_evpn *p)
{
        struct bgp_node *rn, *global_rn;
        struct bgp_path_info *pi;
        afi_t afi = AFI_L2VPN;
        safi_t safi = SAFI_EVPN;

        /* First, locate the route node within the VNI. If it doesn't exist,
         * there
         * is nothing further to do.
         */
        /* NOTE: There is no RD here. */
        rn = bgp_node_lookup(vpn->route_table, (struct prefix *)p);
        if (!rn)
                return 0;

        /* Next, locate route node in the global EVPN routing table. Note that
         * this table is a 2-level tree (RD-level + Prefix-level) similar to
         * L3VPN routes.
         */
        global_rn = bgp_afi_node_lookup(bgp->rib[afi][safi], afi, safi,
                                        (struct prefix *)p, &vpn->prd);
        if (global_rn) {
                /* Delete route entry in the global EVPN table. */
                delete_evpn_route_entry(bgp, afi, safi, global_rn, &pi);

                /* Schedule for processing - withdraws to peers happen from
                 * this table.
                 */
                if (pi)
                        bgp_process(bgp, global_rn, afi, safi);
                bgp_unlock_node(global_rn);
        }

        /* Delete route entry in the VNI route table. This can just be removed.
         */
        delete_evpn_route_entry(bgp, afi, safi, rn, &pi);
        if (pi) {
                bgp_path_info_reap(rn, pi);
                evpn_route_select_install(bgp, vpn, rn);
        }
        bgp_unlock_node(rn);

        return 0;
}

/*
 * Update all type-2 (MACIP) local routes for this VNI - these should also
 * be scheduled for advertise to peers.
 */
static int update_all_type2_routes(struct bgp *bgp, struct bgpevpn *vpn)
{
        afi_t afi;
        safi_t safi;
        struct bgp_node *rn;
        struct bgp_path_info *pi, *tmp_pi;
        struct attr attr;
        struct attr *attr_new;
        uint32_t seq;
        int add_l3_ecomm = 0;

        afi = AFI_L2VPN;
        safi = SAFI_EVPN;

        /* Walk this VNI's route table and update local type-2 routes. For any
         * routes updated, update corresponding entry in the global table too.
         */
        for (rn = bgp_table_top(vpn->route_table); rn;
             rn = bgp_route_next(rn)) {
                const struct prefix_evpn *evp = (const struct prefix_evpn *)bgp_node_get_prefix(rn);
                struct bgp_node *rd_rn;
                struct bgp_path_info *global_pi;

                if (evp->prefix.route_type != BGP_EVPN_MAC_IP_ROUTE)
                        continue;

                /* Identify local route. */
                for (tmp_pi = bgp_node_get_bgp_path_info(rn); tmp_pi;
                     tmp_pi = tmp_pi->next) {
                        if (tmp_pi->peer == bgp->peer_self
                            && tmp_pi->type == ZEBRA_ROUTE_BGP
                            && tmp_pi->sub_type == BGP_ROUTE_STATIC)
                                break;
                }

                if (!tmp_pi)
                        continue;

                /*
                 * Build attribute per local route as the MAC mobility and
                 * some other values could differ for different routes. The
                 * attributes will be shared in the hash table.
                 */
                bgp_attr_default_set(&attr, BGP_ORIGIN_IGP);
                attr.nexthop = vpn->originator_ip;
                attr.mp_nexthop_global_in = vpn->originator_ip;
                attr.mp_nexthop_len = BGP_ATTR_NHLEN_IPV4;
                bgp_evpn_get_rmac_nexthop(vpn, evp, &attr,
                                          tmp_pi->extra->af_flags);

                if (evpn_route_is_sticky(bgp, rn))
                        attr.sticky = 1;
                else if (evpn_route_is_def_gw(bgp, rn)) {
                        attr.default_gw = 1;
                        if (is_evpn_prefix_ipaddr_v6(evp))
                                attr.router_flag = 1;
                }

                if (bgp_debug_zebra(NULL)) {
                        char buf[ETHER_ADDR_STRLEN];
                        char buf1[PREFIX_STRLEN];

                        zlog_debug("VRF %s vni %u evp %s RMAC %s nexthop %s",
                                   vpn->bgp_vrf ?
                                   vrf_id_to_name(vpn->bgp_vrf->vrf_id) : " ",
                                   vpn->vni,
                                   prefix2str(evp, buf1, sizeof(buf1)),
                                   prefix_mac2str(&attr.rmac, buf, sizeof(buf)),
                                   inet_ntoa(attr.mp_nexthop_global_in));
                }

                /* Add L3 VNI RTs and RMAC for non IPv6 link-local if
                 * using L3 VNI for type-2 routes also.
                 */
                if ((is_evpn_prefix_ipaddr_v4(evp) ||
                     !IN6_IS_ADDR_LINKLOCAL(
                        &evp->prefix.macip_addr.ip.ipaddr_v6)) &&
                    CHECK_FLAG(vpn->flags, VNI_FLAG_USE_TWO_LABELS) &&
                    bgpevpn_get_l3vni(vpn))
                        add_l3_ecomm = 1;

                /* Set up extended community. */
                build_evpn_route_extcomm(vpn, &attr, add_l3_ecomm);

                seq = mac_mobility_seqnum(tmp_pi->attr);

                /* Update the route entry. */
                update_evpn_route_entry(bgp, vpn, afi, safi, rn, &attr, 0, &pi,
                                        0, seq);

                /* lock ri to prevent freeing in evpn_route_select_install */
                bgp_path_info_lock(pi);

                /* Perform route selection. Normally, the local route in the
                 * VNI is expected to win and be the best route. However,
                 * under peculiar situations (e.g., tunnel (next hop) IP change
                 * that causes best selection to be based on next hop), a
                 * remote route could win. If the local route is the best,
                 * ensure it is updated in the global EVPN route table and
                 * advertised to peers; otherwise, ensure it is evicted and
                 * (re)install the remote route into zebra.
                 */
                evpn_route_select_install(bgp, vpn, rn);
                if (!CHECK_FLAG(pi->flags, BGP_PATH_SELECTED)) {
                        evpn_cleanup_local_non_best_route(bgp, vpn, rn, pi);
                        /* unlock pi */
                        bgp_path_info_unlock(pi);
                } else {
                        attr_new = pi->attr;
                        /* unlock pi */
                        bgp_path_info_unlock(pi);

                        /* Update route in global routing table. */
                        rd_rn = bgp_afi_node_get(bgp->rib[afi][safi], afi, safi,
                                                 (struct prefix *)evp, &vpn->prd);
                        assert(rd_rn);
                        update_evpn_route_entry(bgp, vpn, afi, safi, rd_rn,
                                                attr_new, 0, &global_pi, 0,
                                                mac_mobility_seqnum(attr_new));

                        /* Schedule for processing and unlock node. */
                        bgp_process(bgp, rd_rn, afi, safi);
                        bgp_unlock_node(rd_rn);
                }

                /* Unintern temporary. */
                aspath_unintern(&attr.aspath);

        }

        return 0;
}

/*
 * Delete all type-2 (MACIP) local routes for this VNI - only from the
 * global routing table. These are also scheduled for withdraw from peers.
 */
static int delete_global_type2_routes(struct bgp *bgp, struct bgpevpn *vpn)
{
        afi_t afi;
        safi_t safi;
        struct bgp_node *rdrn, *rn;
        struct bgp_table *table;
        struct bgp_path_info *pi;

        afi = AFI_L2VPN;
        safi = SAFI_EVPN;

        rdrn = bgp_node_lookup(bgp->rib[afi][safi], (struct prefix *)&vpn->prd);
        if (rdrn && bgp_node_has_bgp_path_info_data(rdrn)) {
                table = bgp_node_get_bgp_table_info(rdrn);
                for (rn = bgp_table_top(table); rn; rn = bgp_route_next(rn)) {
                        const struct prefix_evpn *evp = (const struct prefix_evpn *)bgp_node_get_prefix(rn);

                        if (evp->prefix.route_type != BGP_EVPN_MAC_IP_ROUTE)
                                continue;

                        delete_evpn_route_entry(bgp, afi, safi, rn, &pi);
                        if (pi)
                                bgp_process(bgp, rn, afi, safi);
                }
        }

        /* Unlock RD node. */
        if (rdrn)
                bgp_unlock_node(rdrn);

        return 0;
}

/*
 * Delete all type-2 (MACIP) local routes for this VNI - from the global
 * table as well as the per-VNI route table.
 */
static int delete_all_type2_routes(struct bgp *bgp, struct bgpevpn *vpn)
{
        afi_t afi;
        safi_t safi;
        struct bgp_node *rn;
        struct bgp_path_info *pi;

        afi = AFI_L2VPN;
        safi = SAFI_EVPN;

        /* First, walk the global route table for this VNI's type-2 local
         * routes.
         * EVPN routes are a 2-level table, first get the RD table.
         */
        delete_global_type2_routes(bgp, vpn);

        /* Next, walk this VNI's route table and delete local type-2 routes. */
        for (rn = bgp_table_top(vpn->route_table); rn;
             rn = bgp_route_next(rn)) {
                const struct prefix_evpn *evp = (const struct prefix_evpn *)bgp_node_get_prefix(rn);

                if (evp->prefix.route_type != BGP_EVPN_MAC_IP_ROUTE)
                        continue;

                delete_evpn_route_entry(bgp, afi, safi, rn, &pi);

                /* Route entry in local table gets deleted immediately. */
                if (pi)
                        bgp_path_info_reap(rn, pi);
        }

        return 0;
}

/*
 * Delete all routes in per ES route-table
 */
static int delete_all_es_routes(struct bgp *bgp, struct evpnes *es)
{
        struct bgp_node *rn;
        struct bgp_path_info *pi, *nextpi;

        /* Walk this ES's route table and delete all routes. */
        for (rn = bgp_table_top(es->route_table); rn;
             rn = bgp_route_next(rn)) {
                for (pi = bgp_node_get_bgp_path_info(rn);
                     (pi != NULL) && (nextpi = pi->next, 1); pi = nextpi) {
                        bgp_path_info_delete(rn, pi);
                        bgp_path_info_reap(rn, pi);
                }
        }

        return 0;
}

/*
 * Delete all routes in the per-VNI route table.
 */
static int delete_all_vni_routes(struct bgp *bgp, struct bgpevpn *vpn)
{
        struct bgp_node *rn;
        struct bgp_path_info *pi, *nextpi;

        /* Walk this VNI's route table and delete all routes. */
        for (rn = bgp_table_top(vpn->route_table); rn;
             rn = bgp_route_next(rn)) {
                for (pi = bgp_node_get_bgp_path_info(rn);
                     (pi != NULL) && (nextpi = pi->next, 1); pi = nextpi) {
                        bgp_path_info_delete(rn, pi);
                        bgp_path_info_reap(rn, pi);
                }
        }

        return 0;
}

/* BUM traffic flood mode per-l2-vni */
static int bgp_evpn_vni_flood_mode_get(struct bgp *bgp,
                                        struct bgpevpn *vpn)
{
        /* if flooding has been globally disabled per-vni mode is
         * not relevant
         */
        if (bgp->vxlan_flood_ctrl == VXLAN_FLOOD_DISABLED)
                return VXLAN_FLOOD_DISABLED;

        /* if mcast group ip has been specified we use a PIM-SM MDT */
        if (vpn->mcast_grp.s_addr != INADDR_ANY)
                return VXLAN_FLOOD_PIM_SM;

        /* default is ingress replication */
        return VXLAN_FLOOD_HEAD_END_REPL;
}

/*
 * Update (and advertise) local routes for a VNI. Invoked upon the VNI
 * export RT getting modified or change to tunnel IP. Note that these
 * situations need the route in the per-VNI table as well as the global
 * table to be updated (as attributes change).
 */
int update_routes_for_vni(struct bgp *bgp, struct bgpevpn *vpn)
{
        int ret;
        struct prefix_evpn p;

        /* Update and advertise the type-3 route (only one) followed by the
         * locally learnt type-2 routes (MACIP) - for this VNI.
         *
         * RT-3 only if doing head-end replication
         */
        if (bgp_evpn_vni_flood_mode_get(bgp, vpn)
                                == VXLAN_FLOOD_HEAD_END_REPL) {
                build_evpn_type3_prefix(&p, vpn->originator_ip);
                ret = update_evpn_route(bgp, vpn, &p, 0, 0);
                if (ret)
                        return ret;
        }

        return update_all_type2_routes(bgp, vpn);
}

/* Delete (and withdraw) local routes for specified ES from global and ES table.
 * Also remove all other routes from the per ES table.
 * Invoked when ES is deleted.
 */
static int delete_routes_for_es(struct bgp *bgp, struct evpnes *es)
{
        int ret;
        char buf[ESI_STR_LEN];
        struct prefix_evpn p;

        /* Delete and withdraw locally learnt ES route */
        build_evpn_type4_prefix(&p, &es->esi, es->originator_ip.ipaddr_v4);
        ret = delete_evpn_type4_route(bgp, es, &p);
        if (ret) {
                flog_err(EC_BGP_EVPN_ROUTE_DELETE,
                         "%u failed to delete type-4 route for ESI %s",
                         bgp->vrf_id, esi_to_str(&es->esi, buf, sizeof(buf)));
        }

        /* Delete all routes from per ES table */
        return delete_all_es_routes(bgp, es);
}

/*
 * Delete (and withdraw) local routes for specified VNI from the global
 * table and per-VNI table. After this, remove all other routes from
 * the per-VNI table. Invoked upon the VNI being deleted or EVPN
 * (advertise-all-vni) being disabled.
 */
static int delete_routes_for_vni(struct bgp *bgp, struct bgpevpn *vpn)
{
        int ret;
        struct prefix_evpn p;

        /* Delete and withdraw locally learnt type-2 routes (MACIP)
         * followed by type-3 routes (only one) - for this VNI.
         */
        ret = delete_all_type2_routes(bgp, vpn);
        if (ret)
                return ret;

        build_evpn_type3_prefix(&p, vpn->originator_ip);
        ret = delete_evpn_route(bgp, vpn, &p);
        if (ret)
                return ret;

        /* Delete all routes from the per-VNI table. */
        return delete_all_vni_routes(bgp, vpn);
}

/*
 * There is a flood mcast IP address change. Update the mcast-grp and
 * remove the type-3 route if any. A new type-3 route will be generated
 * post tunnel_ip update if the new flood mode is head-end-replication.
 */
static int bgp_evpn_mcast_grp_change(struct bgp *bgp, struct bgpevpn *vpn,
                struct in_addr mcast_grp)
{
        struct prefix_evpn p;

        vpn->mcast_grp = mcast_grp;

        if (is_vni_live(vpn)) {
                build_evpn_type3_prefix(&p, vpn->originator_ip);
                delete_evpn_route(bgp, vpn, &p);
        }

        return 0;
}

/*
 * There is a tunnel endpoint IP address change for this VNI, delete
 * prior type-3 route (if needed) and update.
 * Note: Route re-advertisement happens elsewhere after other processing
 * other changes.
 */
static int handle_tunnel_ip_change(struct bgp *bgp, struct bgpevpn *vpn,
                                   struct in_addr originator_ip)
{
        struct prefix_evpn p;

        /* If VNI is not live, we only need to update the originator ip */
        if (!is_vni_live(vpn)) {
                vpn->originator_ip = originator_ip;
                return 0;
        }

        /* Update the tunnel-ip hash */
        bgp_tip_del(bgp, &vpn->originator_ip);
        bgp_tip_add(bgp, &originator_ip);

        /* filter routes as martian nexthop db has changed */
        bgp_filter_evpn_routes_upon_martian_nh_change(bgp);

        /* Need to withdraw type-3 route as the originator IP is part
         * of the key.
         */
        build_evpn_type3_prefix(&p, vpn->originator_ip);
        delete_evpn_route(bgp, vpn, &p);

        /* Update the tunnel IP and re-advertise all routes for this VNI. */
        vpn->originator_ip = originator_ip;
        return 0;
}

static struct bgp_path_info *
bgp_create_evpn_bgp_path_info(struct bgp_path_info *parent_pi,
                              struct bgp_node *rn, struct attr *attr)
{
        struct attr *attr_new;
        struct bgp_path_info *pi;

        /* Add (or update) attribute to hash. */
        attr_new = bgp_attr_intern(attr);

        /* Create new route with its attribute. */
        pi = info_make(parent_pi->type, BGP_ROUTE_IMPORTED, 0, parent_pi->peer,
                       attr_new, rn);
        SET_FLAG(pi->flags, BGP_PATH_VALID);
        bgp_path_info_extra_get(pi);
        pi->extra->parent = bgp_path_info_lock(parent_pi);
        bgp_lock_node((struct bgp_node *)parent_pi->net);
        if (parent_pi->extra) {
                memcpy(&pi->extra->label, &parent_pi->extra->label,
                       sizeof(pi->extra->label));
                pi->extra->num_labels = parent_pi->extra->num_labels;
        }
        bgp_path_info_add(rn, pi);

        return pi;
}

/* Install EVPN route entry in ES */
static int install_evpn_route_entry_in_es(struct bgp *bgp, struct evpnes *es,
                                          const struct prefix_evpn *p,
                                          struct bgp_path_info *parent_pi)
{
        int ret = 0;
        struct bgp_node *rn = NULL;
        struct bgp_path_info *pi = NULL;
        struct attr *attr_new = NULL;

        /* Create (or fetch) route within the VNI.
         * NOTE: There is no RD here.
         */
        rn = bgp_node_get(es->route_table, (struct prefix *)p);

        /* Check if route entry is already present. */
        for (pi = bgp_node_get_bgp_path_info(rn); pi; pi = pi->next)
                if (pi->extra
                    && (struct bgp_path_info *)pi->extra->parent == parent_pi)
                        break;

        if (!pi) {
                /* Add (or update) attribute to hash. */
                attr_new = bgp_attr_intern(parent_pi->attr);

                /* Create new route with its attribute. */
                pi = info_make(parent_pi->type, BGP_ROUTE_IMPORTED, 0,
                               parent_pi->peer, attr_new, rn);
                SET_FLAG(pi->flags, BGP_PATH_VALID);
                bgp_path_info_extra_get(pi);
                pi->extra->parent = bgp_path_info_lock(parent_pi);
                bgp_lock_node((struct bgp_node *)parent_pi->net);
                bgp_path_info_add(rn, pi);
        } else {
                if (attrhash_cmp(pi->attr, parent_pi->attr)
                    && !CHECK_FLAG(pi->flags, BGP_PATH_REMOVED)) {
                        bgp_unlock_node(rn);
                        return 0;
                }
                /* The attribute has changed. */
                /* Add (or update) attribute to hash. */
                attr_new = bgp_attr_intern(parent_pi->attr);

                /* Restore route, if needed. */
                if (CHECK_FLAG(pi->flags, BGP_PATH_REMOVED))
                        bgp_path_info_restore(rn, pi);

                /* Mark if nexthop has changed. */
                if (!IPV4_ADDR_SAME(&pi->attr->nexthop, &attr_new->nexthop))
                        SET_FLAG(pi->flags, BGP_PATH_IGP_CHANGED);

                /* Unintern existing, set to new. */
                bgp_attr_unintern(&pi->attr);
                pi->attr = attr_new;
                pi->uptime = bgp_clock();
        }

        /* Perform route selection and update zebra, if required. */
        ret = evpn_es_route_select_install(bgp, es, rn);
        return ret;
}

/*
 * Install route entry into the VRF routing table and invoke route selection.
 */
static int install_evpn_route_entry_in_vrf(struct bgp *bgp_vrf,
                                           const struct prefix_evpn *evp,
                                           struct bgp_path_info *parent_pi)
{
        struct bgp_node *rn;
        struct bgp_path_info *pi;
        struct attr attr;
        struct attr *attr_new;
        int ret = 0;
        struct prefix p;
        struct prefix *pp = &p;
        afi_t afi = 0;
        safi_t safi = 0;
        char buf[PREFIX_STRLEN];
        char buf1[PREFIX_STRLEN];

        memset(pp, 0, sizeof(struct prefix));
        ip_prefix_from_evpn_prefix(evp, pp);

        if (bgp_debug_zebra(NULL)) {
                zlog_debug(
                        "import evpn prefix %s as ip prefix %s in vrf %s",
                        prefix2str(evp, buf, sizeof(buf)),
                        prefix2str(pp, buf1, sizeof(buf)),
                        vrf_id_to_name(bgp_vrf->vrf_id));
        }

        /* Create (or fetch) route within the VRF. */
        /* NOTE: There is no RD here. */
        if (is_evpn_prefix_ipaddr_v4(evp)) {
                afi = AFI_IP;
                safi = SAFI_UNICAST;
                rn = bgp_node_get(bgp_vrf->rib[afi][safi], pp);
        } else if (is_evpn_prefix_ipaddr_v6(evp)) {
                afi = AFI_IP6;
                safi = SAFI_UNICAST;
                rn = bgp_node_get(bgp_vrf->rib[afi][safi], pp);
        } else
                return 0;

        /* EVPN routes currently only support a IPv4 next hop which corresponds
         * to the remote VTEP. When importing into a VRF, if it is IPv6 host
         * or prefix route, we have to convert the next hop to an IPv4-mapped
         * address for the rest of the code to flow through. In the case of IPv4,
         * make sure to set the flag for next hop attribute.
         */
        attr = *parent_pi->attr;
        if (afi == AFI_IP6)
                evpn_convert_nexthop_to_ipv6(&attr);
        else
                attr.flag |= ATTR_FLAG_BIT(BGP_ATTR_NEXT_HOP);

        /* Check if route entry is already present. */
        for (pi = bgp_node_get_bgp_path_info(rn); pi; pi = pi->next)
                if (pi->extra
                    && (struct bgp_path_info *)pi->extra->parent == parent_pi)
                        break;

        if (!pi)
                pi = bgp_create_evpn_bgp_path_info(parent_pi, rn, &attr);
        else {
                if (attrhash_cmp(pi->attr, &attr)
                    && !CHECK_FLAG(pi->flags, BGP_PATH_REMOVED)) {
                        bgp_unlock_node(rn);
                        return 0;
                }
                /* The attribute has changed. */
                /* Add (or update) attribute to hash. */
                attr_new = bgp_attr_intern(&attr);

                /* Restore route, if needed. */
                if (CHECK_FLAG(pi->flags, BGP_PATH_REMOVED))
                        bgp_path_info_restore(rn, pi);

                /* Mark if nexthop has changed. */
                if ((afi == AFI_IP
                     && !IPV4_ADDR_SAME(&pi->attr->nexthop, &attr_new->nexthop))
                    || (afi == AFI_IP6
                        && !IPV6_ADDR_SAME(&pi->attr->mp_nexthop_global,
                                           &attr_new->mp_nexthop_global)))
                        SET_FLAG(pi->flags, BGP_PATH_IGP_CHANGED);

                bgp_path_info_set_flag(rn, pi, BGP_PATH_ATTR_CHANGED);
                /* Unintern existing, set to new. */
                bgp_attr_unintern(&pi->attr);
                pi->attr = attr_new;
                pi->uptime = bgp_clock();
        }
        /* as it is an importation, change nexthop */
        bgp_path_info_set_flag(rn, pi, BGP_PATH_ANNC_NH_SELF);

        bgp_aggregate_increment(bgp_vrf, bgp_node_get_prefix(rn), pi, afi,
                                safi);

        /* Perform route selection and update zebra, if required. */
        bgp_process(bgp_vrf, rn, afi, safi);

        /* Process for route leaking. */
        vpn_leak_from_vrf_update(bgp_get_default(), bgp_vrf, pi);

        bgp_unlock_node(rn);

        return ret;
}

/*
 * Install route entry into the VNI routing table and invoke route selection.
 */
static int install_evpn_route_entry(struct bgp *bgp, struct bgpevpn *vpn,
                                    const struct prefix_evpn *p,
                                    struct bgp_path_info *parent_pi)
{
        struct bgp_node *rn;
        struct bgp_path_info *pi;
        struct attr *attr_new;
        int ret;

        /* Create (or fetch) route within the VNI. */
        /* NOTE: There is no RD here. */
        rn = bgp_node_get(vpn->route_table, (struct prefix *)p);

        /* Check if route entry is already present. */
        for (pi = bgp_node_get_bgp_path_info(rn); pi; pi = pi->next)
                if (pi->extra
                    && (struct bgp_path_info *)pi->extra->parent == parent_pi)
                        break;

        if (!pi) {
                /* Create an info */
                (void)bgp_create_evpn_bgp_path_info(parent_pi, rn,
                                                    parent_pi->attr);
        } else {
                if (attrhash_cmp(pi->attr, parent_pi->attr)
                    && !CHECK_FLAG(pi->flags, BGP_PATH_REMOVED)) {
                        bgp_unlock_node(rn);
                        return 0;
                }
                /* The attribute has changed. */
                /* Add (or update) attribute to hash. */
                attr_new = bgp_attr_intern(parent_pi->attr);

                /* Restore route, if needed. */
                if (CHECK_FLAG(pi->flags, BGP_PATH_REMOVED))
                        bgp_path_info_restore(rn, pi);

                /* Mark if nexthop has changed. */
                if (!IPV4_ADDR_SAME(&pi->attr->nexthop, &attr_new->nexthop))
                        SET_FLAG(pi->flags, BGP_PATH_IGP_CHANGED);

                /* Unintern existing, set to new. */
                bgp_attr_unintern(&pi->attr);
                pi->attr = attr_new;
                pi->uptime = bgp_clock();
        }

        /* Perform route selection and update zebra, if required. */
        ret = evpn_route_select_install(bgp, vpn, rn);

        bgp_unlock_node(rn);

        return ret;
}

/* Uninstall EVPN route entry from ES route table */
static int uninstall_evpn_route_entry_in_es(struct bgp *bgp, struct evpnes *es,
                                            const struct prefix_evpn *p,
                                            struct bgp_path_info *parent_pi)
{
        int ret;
        struct bgp_node *rn;
        struct bgp_path_info *pi;

        if (!es->route_table)
                return 0;

        /* Locate route within the ESI.
         * NOTE: There is no RD here.
         */
        rn = bgp_node_lookup(es->route_table, (struct prefix *)p);
        if (!rn)
                return 0;

        /* Find matching route entry. */
        for (pi = bgp_node_get_bgp_path_info(rn); pi; pi = pi->next)
                if (pi->extra
                    && (struct bgp_path_info *)pi->extra->parent == parent_pi)
                        break;

        if (!pi)
                return 0;

        /* Mark entry for deletion */
        bgp_path_info_delete(rn, pi);

        /* Perform route selection and update zebra, if required. */
        ret = evpn_es_route_select_install(bgp, es, rn);

        /* Unlock route node. */
        bgp_unlock_node(rn);

        return ret;
}

/*
 * Uninstall route entry from the VRF routing table and send message
 * to zebra, if appropriate.
 */
static int uninstall_evpn_route_entry_in_vrf(struct bgp *bgp_vrf,
                                             const struct prefix_evpn *evp,
                                             struct bgp_path_info *parent_pi)
{
        struct bgp_node *rn;
        struct bgp_path_info *pi;
        int ret = 0;
        struct prefix p;
        struct prefix *pp = &p;
        afi_t afi = 0;
        safi_t safi = 0;
        char buf[PREFIX_STRLEN];
        char buf1[PREFIX_STRLEN];

        memset(pp, 0, sizeof(struct prefix));
        ip_prefix_from_evpn_prefix(evp, pp);

        if (bgp_debug_zebra(NULL)) {
                zlog_debug(
                        "uninstalling evpn prefix %s as ip prefix %s in vrf %s",
                        prefix2str(evp, buf, sizeof(buf)),
                        prefix2str(pp, buf1, sizeof(buf)),
                        vrf_id_to_name(bgp_vrf->vrf_id));
        }

        /* Locate route within the VRF. */
        /* NOTE: There is no RD here. */
        if (is_evpn_prefix_ipaddr_v4(evp)) {
                afi = AFI_IP;
                safi = SAFI_UNICAST;
                rn = bgp_node_lookup(bgp_vrf->rib[afi][safi], pp);
        } else {
                afi = AFI_IP6;
                safi = SAFI_UNICAST;
                rn = bgp_node_lookup(bgp_vrf->rib[afi][safi], pp);
        }

        if (!rn)
                return 0;

        /* Find matching route entry. */
        for (pi = bgp_node_get_bgp_path_info(rn); pi; pi = pi->next)
                if (pi->extra
                    && (struct bgp_path_info *)pi->extra->parent == parent_pi)
                        break;

        if (!pi)
                return 0;

        /* Process for route leaking. */
        vpn_leak_from_vrf_withdraw(bgp_get_default(), bgp_vrf, pi);

        bgp_aggregate_decrement(bgp_vrf, bgp_node_get_prefix(rn), pi, afi,
                                safi);

        /* Mark entry for deletion */
        bgp_path_info_delete(rn, pi);

        /* Perform route selection and update zebra, if required. */
        bgp_process(bgp_vrf, rn, afi, safi);

        /* Unlock route node. */
        bgp_unlock_node(rn);

        return ret;
}

/*
 * Uninstall route entry from the VNI routing table and send message
 * to zebra, if appropriate.
 */
static int uninstall_evpn_route_entry(struct bgp *bgp, struct bgpevpn *vpn,
                                      const struct prefix_evpn *p,
                                      struct bgp_path_info *parent_pi)
{
        struct bgp_node *rn;
        struct bgp_path_info *pi;
        int ret;

        /* Locate route within the VNI. */
        /* NOTE: There is no RD here. */
        rn = bgp_node_lookup(vpn->route_table, (struct prefix *)p);
        if (!rn)
                return 0;

        /* Find matching route entry. */
        for (pi = bgp_node_get_bgp_path_info(rn); pi; pi = pi->next)
                if (pi->extra
                    && (struct bgp_path_info *)pi->extra->parent == parent_pi)
                        break;

        if (!pi)
                return 0;

        /* Mark entry for deletion */
        bgp_path_info_delete(rn, pi);

        /* Perform route selection and update zebra, if required. */
        ret = evpn_route_select_install(bgp, vpn, rn);

        /* Unlock route node. */
        bgp_unlock_node(rn);

        return ret;
}

/*
 * Given a prefix, see if it belongs to ES.
 */
static int is_prefix_matching_for_es(const struct prefix_evpn *p,
                                     struct evpnes *es)
{
        /* if not an ES route return false */
        if (p->prefix.route_type != BGP_EVPN_ES_ROUTE)
                return 0;

        if (memcmp(&p->prefix.es_addr.esi, &es->esi, sizeof(esi_t)) == 0)
                return 1;

        return 0;
}

/*
 * Given a route entry and a VRF, see if this route entry should be
 * imported into the VRF i.e., RTs match.
 */
static int is_route_matching_for_vrf(struct bgp *bgp_vrf,
                                     struct bgp_path_info *pi)
{
        struct attr *attr = pi->attr;
        struct ecommunity *ecom;
        int i;

        assert(attr);
        /* Route should have valid RT to be even considered. */
        if (!(attr->flag & ATTR_FLAG_BIT(BGP_ATTR_EXT_COMMUNITIES)))
                return 0;

        ecom = attr->ecommunity;
        if (!ecom || !ecom->size)
                return 0;

        /* For each extended community RT, see if it matches this VNI. If any RT
         * matches, we're done.
         */
        for (i = 0; i < ecom->size; i++) {
                uint8_t *pnt;
                uint8_t type, sub_type;
                struct ecommunity_val *eval;
                struct ecommunity_val eval_tmp;
                struct vrf_irt_node *irt;

                /* Only deal with RTs */
                pnt = (ecom->val + (i * ECOMMUNITY_SIZE));
                eval = (struct ecommunity_val *)(ecom->val
                                                 + (i * ECOMMUNITY_SIZE));
                type = *pnt++;
                sub_type = *pnt++;
                if (sub_type != ECOMMUNITY_ROUTE_TARGET)
                        continue;

                /* See if this RT matches specified VNIs import RTs */
                irt = lookup_vrf_import_rt(eval);
                if (irt)
                        if (is_vrf_present_in_irt_vrfs(irt->vrfs, bgp_vrf))
                                return 1;

                /* Also check for non-exact match. In this, we mask out the AS
                 * and
                 * only check on the local-admin sub-field. This is to
                 * facilitate using
                 * VNI as the RT for EBGP peering too.
                 */
                irt = NULL;
                if (type == ECOMMUNITY_ENCODE_AS
                    || type == ECOMMUNITY_ENCODE_AS4
                    || type == ECOMMUNITY_ENCODE_IP) {
                        memcpy(&eval_tmp, eval, ECOMMUNITY_SIZE);
                        mask_ecom_global_admin(&eval_tmp, eval);
                        irt = lookup_vrf_import_rt(&eval_tmp);
                }
                if (irt)
                        if (is_vrf_present_in_irt_vrfs(irt->vrfs, bgp_vrf))
                                return 1;
        }

        return 0;
}

/*
 * Given a route entry and a VNI, see if this route entry should be
 * imported into the VNI i.e., RTs match.
 */
static int is_route_matching_for_vni(struct bgp *bgp, struct bgpevpn *vpn,
                                     struct bgp_path_info *pi)
{
        struct attr *attr = pi->attr;
        struct ecommunity *ecom;
        int i;

        assert(attr);
        /* Route should have valid RT to be even considered. */
        if (!(attr->flag & ATTR_FLAG_BIT(BGP_ATTR_EXT_COMMUNITIES)))
                return 0;

        ecom = attr->ecommunity;
        if (!ecom || !ecom->size)
                return 0;

        /* For each extended community RT, see if it matches this VNI. If any RT
         * matches, we're done.
         */
        for (i = 0; i < ecom->size; i++) {
                uint8_t *pnt;
                uint8_t type, sub_type;
                struct ecommunity_val *eval;
                struct ecommunity_val eval_tmp;
                struct irt_node *irt;

                /* Only deal with RTs */
                pnt = (ecom->val + (i * ECOMMUNITY_SIZE));
                eval = (struct ecommunity_val *)(ecom->val
                                                 + (i * ECOMMUNITY_SIZE));
                type = *pnt++;
                sub_type = *pnt++;
                if (sub_type != ECOMMUNITY_ROUTE_TARGET)
                        continue;

                /* See if this RT matches specified VNIs import RTs */
                irt = lookup_import_rt(bgp, eval);
                if (irt)
                        if (is_vni_present_in_irt_vnis(irt->vnis, vpn))
                                return 1;

                /* Also check for non-exact match. In this, we mask out the AS
                 * and
                 * only check on the local-admin sub-field. This is to
                 * facilitate using
                 * VNI as the RT for EBGP peering too.
                 */
                irt = NULL;
                if (type == ECOMMUNITY_ENCODE_AS
                    || type == ECOMMUNITY_ENCODE_AS4
                    || type == ECOMMUNITY_ENCODE_IP) {
                        memcpy(&eval_tmp, eval, ECOMMUNITY_SIZE);
                        mask_ecom_global_admin(&eval_tmp, eval);
                        irt = lookup_import_rt(bgp, &eval_tmp);
                }
                if (irt)
                        if (is_vni_present_in_irt_vnis(irt->vnis, vpn))
                                return 1;
        }

        return 0;
}

static int install_uninstall_routes_for_es(struct bgp *bgp,
                                           struct evpnes *es,
                                           int install)
{
        int ret;
        afi_t afi;
        safi_t safi;
        char buf[PREFIX_STRLEN];
        char buf1[ESI_STR_LEN];
        struct bgp_node *rd_rn, *rn;
        struct bgp_table *table;
        struct bgp_path_info *pi;

        afi = AFI_L2VPN;
        safi = SAFI_EVPN;

        /*
         * Walk entire global routing table and evaluate routes which could be
         * imported into this VRF. Note that we need to loop through all global
         * routes to determine which route matches the import rt on vrf
         */
        for (rd_rn = bgp_table_top(bgp->rib[afi][safi]); rd_rn;
             rd_rn = bgp_route_next(rd_rn)) {
                table = bgp_node_get_bgp_table_info(rd_rn);
                if (!table)
                        continue;

                for (rn = bgp_table_top(table); rn; rn = bgp_route_next(rn)) {
                        const struct prefix_evpn *evp =
                                (const struct prefix_evpn *)bgp_node_get_prefix(
                                        rn);

                        for (pi = bgp_node_get_bgp_path_info(rn); pi;
                             pi = pi->next) {
                                /*
                                 * Consider "valid" remote routes applicable for
                                 * this ES.
                                 */
                                if (!(CHECK_FLAG(pi->flags, BGP_PATH_VALID)
                                      && pi->type == ZEBRA_ROUTE_BGP
                                      && pi->sub_type == BGP_ROUTE_NORMAL))
                                        continue;

                                if (!is_prefix_matching_for_es(evp, es))
                                        continue;

                                if (install)
                                        ret = install_evpn_route_entry_in_es(
                                                bgp, es, evp, pi);
                                else
                                        ret = uninstall_evpn_route_entry_in_es(
                                                bgp, es, evp, pi);

                                if (ret) {
                                        flog_err(
                                                EC_BGP_EVPN_FAIL,
                                                "Failed to %s EVPN %s route in ESI %s",
                                                install ? "install"
                                                        : "uninstall",
                                                prefix2str(evp, buf,
                                                           sizeof(buf)),
                                                esi_to_str(&es->esi, buf1,
                                                           sizeof(buf1)));
                                        return ret;
                                }
                        }
                }
        }
        return 0;
}

/* This API will scan evpn routes for checking attribute's rmac
 * macthes with bgp instance router mac. It avoid installing
 * route into bgp vrf table and remote rmac in bridge table.
 */
static int bgp_evpn_route_rmac_self_check(struct bgp *bgp_vrf,
                                          const struct prefix_evpn *evp,
                                          struct bgp_path_info *pi)
{
        /* evpn route could have learnt prior to L3vni has come up,
         * perform rmac check before installing route and
         * remote router mac.
         * The route will be removed from global bgp table once
         * SVI comes up with MAC and stored in hash, triggers
         * bgp_mac_rescan_all_evpn_tables.
         */
        if (memcmp(&bgp_vrf->rmac, &pi->attr->rmac, ETH_ALEN) == 0) {
                if (bgp_debug_update(pi->peer, NULL, NULL, 1)) {
                        char buf1[PREFIX_STRLEN];
                        char attr_str[BUFSIZ] = {0};

                        bgp_dump_attr(pi->attr, attr_str, BUFSIZ);

                        zlog_debug("%s: bgp %u prefix %s with attr %s - DENIED due to self mac",
                                __func__, bgp_vrf->vrf_id,
                                prefix2str(evp, buf1, sizeof(buf1)),
                                attr_str);
                }

                return 1;
        }

        return 0;
}

/*
 * Install or uninstall mac-ip routes are appropriate for this
 * particular VRF.
 */
static int install_uninstall_routes_for_vrf(struct bgp *bgp_vrf, int install)
{
        afi_t afi;
        safi_t safi;
        struct bgp_node *rd_rn, *rn;
        struct bgp_table *table;
        struct bgp_path_info *pi;
        int ret;
        char buf[PREFIX_STRLEN];
        struct bgp *bgp_evpn = NULL;

        afi = AFI_L2VPN;
        safi = SAFI_EVPN;
        bgp_evpn = bgp_get_evpn();
        if (!bgp_evpn)
                return -1;

        /* Walk entire global routing table and evaluate routes which could be
         * imported into this VRF. Note that we need to loop through all global
         * routes to determine which route matches the import rt on vrf
         */
        for (rd_rn = bgp_table_top(bgp_evpn->rib[afi][safi]); rd_rn;
             rd_rn = bgp_route_next(rd_rn)) {
                table = bgp_node_get_bgp_table_info(rd_rn);
                if (!table)
                        continue;

                for (rn = bgp_table_top(table); rn; rn = bgp_route_next(rn)) {
                        const struct prefix_evpn *evp = (const struct prefix_evpn *)bgp_node_get_prefix(rn);

                        /* if not mac-ip route skip this route */
                        if (!(evp->prefix.route_type == BGP_EVPN_MAC_IP_ROUTE
                              || evp->prefix.route_type
                                         == BGP_EVPN_IP_PREFIX_ROUTE))
                                continue;

                        /* if not a mac+ip route skip this route */
                        if (!(is_evpn_prefix_ipaddr_v4(evp)
                              || is_evpn_prefix_ipaddr_v6(evp)))
                                continue;

                        for (pi = bgp_node_get_bgp_path_info(rn); pi;
                             pi = pi->next) {
                                /* Consider "valid" remote routes applicable for
                                 * this VRF.
                                 */
                                if (!(CHECK_FLAG(pi->flags, BGP_PATH_VALID)
                                      && pi->type == ZEBRA_ROUTE_BGP
                                      && pi->sub_type == BGP_ROUTE_NORMAL))
                                        continue;

                                if (is_route_matching_for_vrf(bgp_vrf, pi)) {
                                        if (bgp_evpn_route_rmac_self_check(
                                                                bgp_vrf, evp, pi))
                                                continue;

                                        if (install)
                                                ret = install_evpn_route_entry_in_vrf(
                                                        bgp_vrf, evp, pi);
                                        else
                                                ret = uninstall_evpn_route_entry_in_vrf(
                                                        bgp_vrf, evp, pi);

                                        if (ret) {
                                                flog_err(
                                                        EC_BGP_EVPN_FAIL,
                                                        "Failed to %s EVPN %s route in VRF %s",
                                                        install ? "install"
                                                                : "uninstall",
                                                        prefix2str(evp, buf,
                                                                   sizeof(buf)),
                                                        vrf_id_to_name(
                                                                bgp_vrf->vrf_id));
                                                return ret;
                                        }
                                }
                        }
                }
        }

        return 0;
}

/*
 * Install or uninstall routes of specified type that are appropriate for this
 * particular VNI.
 */
static int install_uninstall_routes_for_vni(struct bgp *bgp,
                                            struct bgpevpn *vpn,
                                            bgp_evpn_route_type rtype,
                                            int install)
{
        afi_t afi;
        safi_t safi;
        struct bgp_node *rd_rn, *rn;
        struct bgp_table *table;
        struct bgp_path_info *pi;
        int ret;

        afi = AFI_L2VPN;
        safi = SAFI_EVPN;

        /* Walk entire global routing table and evaluate routes which could be
         * imported into this VPN. Note that we cannot just look at the routes
         * for
         * the VNI's RD - remote routes applicable for this VNI could have any
         * RD.
         */
        /* EVPN routes are a 2-level table. */
        for (rd_rn = bgp_table_top(bgp->rib[afi][safi]); rd_rn;
             rd_rn = bgp_route_next(rd_rn)) {
                table = bgp_node_get_bgp_table_info(rd_rn);
                if (!table)
                        continue;

                for (rn = bgp_table_top(table); rn; rn = bgp_route_next(rn)) {
                        const struct prefix_evpn *evp =
                                (const struct prefix_evpn *)bgp_node_get_prefix(
                                        rn);

                        if (evp->prefix.route_type != rtype)
                                continue;

                        for (pi = bgp_node_get_bgp_path_info(rn); pi;
                             pi = pi->next) {
                                /* Consider "valid" remote routes applicable for
                                 * this VNI. */
                                if (!(CHECK_FLAG(pi->flags, BGP_PATH_VALID)
                                      && pi->type == ZEBRA_ROUTE_BGP
                                      && pi->sub_type == BGP_ROUTE_NORMAL))
                                        continue;

                                if (is_route_matching_for_vni(bgp, vpn, pi)) {
                                        if (install)
                                                ret = install_evpn_route_entry(
                                                        bgp, vpn, evp, pi);
                                        else
                                                ret = uninstall_evpn_route_entry(
                                                        bgp, vpn, evp, pi);

                                        if (ret) {
                                                flog_err(
                                                        EC_BGP_EVPN_FAIL,
                                                        "%u: Failed to %s EVPN %s route in VNI %u",
                                                        bgp->vrf_id,
                                                        install ? "install"
                                                                : "uninstall",
                                                        rtype == BGP_EVPN_MAC_IP_ROUTE
                                                                ? "MACIP"
                                                                : "IMET",
                                                        vpn->vni);
                                                return ret;
                                        }
                                }
                        }
                }
        }

        return 0;
}

/* Install any existing remote ES routes applicable for this ES into its routing
 * table. This is invoked when ES comes up.
 */
static int install_routes_for_es(struct bgp *bgp, struct evpnes *es)
{
        return install_uninstall_routes_for_es(bgp, es, 1);
}


/* Install any existing remote routes applicable for this VRF into VRF RIB. This
 * is invoked upon l3vni-add or l3vni import rt change
 */
static int install_routes_for_vrf(struct bgp *bgp_vrf)
{
        install_uninstall_routes_for_vrf(bgp_vrf, 1);
        return 0;
}

/*
 * Install any existing remote routes applicable for this VNI into its
 * routing table. This is invoked when a VNI becomes "live" or its Import
 * RT is changed.
 */
static int install_routes_for_vni(struct bgp *bgp, struct bgpevpn *vpn)
{
        int ret;

        /* Install type-3 routes followed by type-2 routes - the ones applicable
         * for this VNI.
         */
        ret = install_uninstall_routes_for_vni(bgp, vpn, BGP_EVPN_IMET_ROUTE,
                                               1);
        if (ret)
                return ret;

        return install_uninstall_routes_for_vni(bgp, vpn, BGP_EVPN_MAC_IP_ROUTE,
                                                1);
}

/* uninstall routes from l3vni vrf. */
static int uninstall_routes_for_vrf(struct bgp *bgp_vrf)
{
        install_uninstall_routes_for_vrf(bgp_vrf, 0);
        return 0;
}

/*
 * Uninstall any existing remote routes for this VNI. One scenario in which
 * this is invoked is upon an import RT change.
 */
static int uninstall_routes_for_vni(struct bgp *bgp, struct bgpevpn *vpn)
{
        int ret;

        /* Uninstall type-2 routes followed by type-3 routes - the ones
         * applicable
         * for this VNI.
         */
        ret = install_uninstall_routes_for_vni(bgp, vpn, BGP_EVPN_MAC_IP_ROUTE,
                                               0);
        if (ret)
                return ret;

        return install_uninstall_routes_for_vni(bgp, vpn, BGP_EVPN_IMET_ROUTE,
                                                0);
}

/* Install or unistall route in ES */
static int install_uninstall_route_in_es(struct bgp *bgp, struct evpnes *es,
                                         afi_t afi, safi_t safi,
                                         struct prefix_evpn *evp,
                                         struct bgp_path_info *pi, int install)
{
        int ret = 0;
        char buf[ESI_STR_LEN];

        if (install)
                ret = install_evpn_route_entry_in_es(bgp, es, evp, pi);
        else
                ret = uninstall_evpn_route_entry_in_es(bgp, es, evp, pi);

        if (ret) {
                flog_err(
                        EC_BGP_EVPN_FAIL,
                        "%u: Failed to %s EVPN %s route in ESI %s", bgp->vrf_id,
                        install ? "install" : "uninstall", "ES",
                        esi_to_str(&evp->prefix.es_addr.esi, buf, sizeof(buf)));
                return ret;
        }
        return 0;
}

/*
 * Install or uninstall route in matching VRFs (list).
 */
static int install_uninstall_route_in_vrfs(struct bgp *bgp_def, afi_t afi,
                                           safi_t safi, struct prefix_evpn *evp,
                                           struct bgp_path_info *pi,
                                           struct list *vrfs, int install)
{
        char buf[PREFIX2STR_BUFFER];
        struct bgp *bgp_vrf;
        struct listnode *node, *nnode;

        /* Only type-2/type-5 routes go into a VRF */
        if (!(evp->prefix.route_type == BGP_EVPN_MAC_IP_ROUTE
              || evp->prefix.route_type == BGP_EVPN_IP_PREFIX_ROUTE))
                return 0;

        /* if it is type-2 route and not a mac+ip route skip this route */
        if ((evp->prefix.route_type == BGP_EVPN_MAC_IP_ROUTE)
            && !(is_evpn_prefix_ipaddr_v4(evp)
                 || is_evpn_prefix_ipaddr_v6(evp)))
                return 0;

        for (ALL_LIST_ELEMENTS(vrfs, node, nnode, bgp_vrf)) {
                int ret;

                if (install)
                        ret = install_evpn_route_entry_in_vrf(bgp_vrf, evp, pi);
                else
                        ret = uninstall_evpn_route_entry_in_vrf(bgp_vrf, evp,
                                                                pi);

                if (ret) {
                        flog_err(EC_BGP_EVPN_FAIL,
                                 "%u: Failed to %s prefix %s in VRF %s",
                                 bgp_def->vrf_id,
                                 install ? "install" : "uninstall",
                                 prefix2str(evp, buf, sizeof(buf)),
                                 vrf_id_to_name(bgp_vrf->vrf_id));
                        return ret;
                }
        }

        return 0;
}

/*
 * Install or uninstall route in matching VNIs (list).
 */
static int install_uninstall_route_in_vnis(struct bgp *bgp, afi_t afi,
                                           safi_t safi, struct prefix_evpn *evp,
                                           struct bgp_path_info *pi,
                                           struct list *vnis, int install)
{
        struct bgpevpn *vpn;
        struct listnode *node, *nnode;

        for (ALL_LIST_ELEMENTS(vnis, node, nnode, vpn)) {
                int ret;

                if (!is_vni_live(vpn))
                        continue;

                if (install)
                        ret = install_evpn_route_entry(bgp, vpn, evp, pi);
                else
                        ret = uninstall_evpn_route_entry(bgp, vpn, evp, pi);

                if (ret) {
                        flog_err(EC_BGP_EVPN_FAIL,
                                 "%u: Failed to %s EVPN %s route in VNI %u",
                                 bgp->vrf_id, install ? "install" : "uninstall",
                                 evp->prefix.route_type == BGP_EVPN_MAC_IP_ROUTE
                                         ? "MACIP"
                                         : "IMET",
                                 vpn->vni);
                        return ret;
                }
        }

        return 0;
}

/*
 * Install or uninstall route for appropriate VNIs/ESIs.
 */
static int install_uninstall_evpn_route(struct bgp *bgp, afi_t afi, safi_t safi,
                                        const struct prefix *p,
                                        struct bgp_path_info *pi, int import)
{
        struct prefix_evpn *evp = (struct prefix_evpn *)p;
        struct attr *attr = pi->attr;
        struct ecommunity *ecom;
        int i;

        assert(attr);

        /* Only type-2, type-3, type-4 and type-5 are supported currently */
        if (!(evp->prefix.route_type == BGP_EVPN_MAC_IP_ROUTE
              || evp->prefix.route_type == BGP_EVPN_IMET_ROUTE
              || evp->prefix.route_type == BGP_EVPN_ES_ROUTE
              || evp->prefix.route_type == BGP_EVPN_IP_PREFIX_ROUTE))
                return 0;

        /* If we don't have Route Target, nothing much to do. */
        if (!(attr->flag & ATTR_FLAG_BIT(BGP_ATTR_EXT_COMMUNITIES)))
                return 0;

        ecom = attr->ecommunity;
        if (!ecom || !ecom->size)
                return -1;

        /* An EVPN route belongs to a VNI or a VRF or an ESI based on the RTs
         * attached to the route */
        for (i = 0; i < ecom->size; i++) {
                uint8_t *pnt;
                uint8_t type, sub_type;
                struct ecommunity_val *eval;
                struct ecommunity_val eval_tmp;
                struct irt_node *irt;    /* import rt for l2vni */
                struct vrf_irt_node *vrf_irt; /* import rt for l3vni */
                struct evpnes *es;

                /* Only deal with RTs */
                pnt = (ecom->val + (i * ECOMMUNITY_SIZE));
                eval = (struct ecommunity_val *)(ecom->val
                                                 + (i * ECOMMUNITY_SIZE));
                type = *pnt++;
                sub_type = *pnt++;
                if (sub_type != ECOMMUNITY_ROUTE_TARGET)
                        continue;

                /*
                 * macip routes (type-2) are imported into VNI and VRF tables.
                 * IMET route is imported into VNI table.
                 * prefix routes are imported into VRF table.
                 */
                if (evp->prefix.route_type == BGP_EVPN_MAC_IP_ROUTE ||
                    evp->prefix.route_type == BGP_EVPN_IMET_ROUTE ||
                    evp->prefix.route_type == BGP_EVPN_IP_PREFIX_ROUTE) {

                        irt = lookup_import_rt(bgp, eval);
                        if (irt)
                                install_uninstall_route_in_vnis(
                                        bgp, afi, safi, evp, pi, irt->vnis,
                                        import);

                        vrf_irt = lookup_vrf_import_rt(eval);
                        if (vrf_irt)
                                install_uninstall_route_in_vrfs(
                                        bgp, afi, safi, evp, pi, vrf_irt->vrfs,
                                        import);

                        /* Also check for non-exact match.
                         * In this, we mask out the AS and
                         * only check on the local-admin sub-field.
                         * This is to facilitate using
                         * VNI as the RT for EBGP peering too.
                         */
                        irt = NULL;
                        vrf_irt = NULL;
                        if (type == ECOMMUNITY_ENCODE_AS
                            || type == ECOMMUNITY_ENCODE_AS4
                            || type == ECOMMUNITY_ENCODE_IP) {
                                memcpy(&eval_tmp, eval, ECOMMUNITY_SIZE);
                                mask_ecom_global_admin(&eval_tmp, eval);
                                irt = lookup_import_rt(bgp, &eval_tmp);
                                vrf_irt = lookup_vrf_import_rt(&eval_tmp);
                        }

                        if (irt)
                                install_uninstall_route_in_vnis(
                                        bgp, afi, safi, evp, pi, irt->vnis,
                                        import);
                        if (vrf_irt)
                                install_uninstall_route_in_vrfs(
                                        bgp, afi, safi, evp, pi, vrf_irt->vrfs,
                                        import);
                }

                /* es route is imported into the es table */
                if (evp->prefix.route_type == BGP_EVPN_ES_ROUTE) {

                        /* we will match based on the entire esi to avoid
                         * imoort of an es route for esi2 into esi1
                         */
                        es = bgp_evpn_lookup_es(bgp, &evp->prefix.es_addr.esi);
                        if (es && is_es_local(es))
                                install_uninstall_route_in_es(
                                        bgp, es, afi, safi, evp, pi, import);
                }
        }

        return 0;
}

/*
 * delete and withdraw all ipv4 and ipv6 routes in the vrf table as type-5
 * routes
 */
static void delete_withdraw_vrf_routes(struct bgp *bgp_vrf)
{
        /* Delete ipv4 default route and withdraw from peers */
        if (evpn_default_originate_set(bgp_vrf, AFI_IP, SAFI_UNICAST))
                bgp_evpn_install_uninstall_default_route(bgp_vrf, AFI_IP,
                                                         SAFI_UNICAST, false);

        /* delete all ipv4 routes and withdraw from peers */
        if (advertise_type5_routes(bgp_vrf, AFI_IP))
                bgp_evpn_withdraw_type5_routes(bgp_vrf, AFI_IP, SAFI_UNICAST);

        /* Delete ipv6 default route and withdraw from peers */
        if (evpn_default_originate_set(bgp_vrf, AFI_IP6, SAFI_UNICAST))
                bgp_evpn_install_uninstall_default_route(bgp_vrf, AFI_IP6,
                                                         SAFI_UNICAST, false);

        /* delete all ipv6 routes and withdraw from peers */
        if (advertise_type5_routes(bgp_vrf, AFI_IP6))
                bgp_evpn_withdraw_type5_routes(bgp_vrf, AFI_IP6, SAFI_UNICAST);
}

/*
 * update and advertise all ipv4 and ipv6 routes in thr vrf table as type-5
 * routes
 */
void update_advertise_vrf_routes(struct bgp *bgp_vrf)
{
        struct bgp *bgp_evpn = NULL; /* EVPN bgp instance */

        bgp_evpn = bgp_get_evpn();
        if (!bgp_evpn)
                return;

        /* update all ipv4 routes */
        if (advertise_type5_routes(bgp_vrf, AFI_IP))
                bgp_evpn_advertise_type5_routes(bgp_vrf, AFI_IP, SAFI_UNICAST);

        /* update ipv4 default route and withdraw from peers */
        if (evpn_default_originate_set(bgp_vrf, AFI_IP, SAFI_UNICAST))
                bgp_evpn_install_uninstall_default_route(bgp_vrf, AFI_IP,
                                                         SAFI_UNICAST, true);

        /* update all ipv6 routes */
        if (advertise_type5_routes(bgp_vrf, AFI_IP6))
                bgp_evpn_advertise_type5_routes(bgp_vrf, AFI_IP6, SAFI_UNICAST);

        /* update ipv6 default route and withdraw from peers */
        if (evpn_default_originate_set(bgp_vrf, AFI_IP6, SAFI_UNICAST))
                bgp_evpn_install_uninstall_default_route(bgp_vrf, AFI_IP6,
                                                         SAFI_UNICAST, true);

}

/*
 * update and advertise local routes for a VRF as type-5 routes.
 * This is invoked upon RD change for a VRF. Note taht the processing is only
 * done in the global route table using the routes which already exist in the
 * VRF routing table
 */
static void update_router_id_vrf(struct bgp *bgp_vrf)
{
        /* skip if the RD is configured */
        if (is_vrf_rd_configured(bgp_vrf))
                return;

        /* derive the RD for the VRF based on new router-id */
        bgp_evpn_derive_auto_rd_for_vrf(bgp_vrf);

        /* update advertise ipv4|ipv6 routes as type-5 routes */
        update_advertise_vrf_routes(bgp_vrf);
}

/*
 * Delete and withdraw all type-5 routes  for the RD corresponding to VRF.
 * This is invoked upon VRF RD change. The processing is done only from global
 * table.
 */
static void withdraw_router_id_vrf(struct bgp *bgp_vrf)
{
        /* skip if the RD is configured */
        if (is_vrf_rd_configured(bgp_vrf))
                return;

        /* delete/withdraw ipv4|ipv6 routes as type-5 routes */
        delete_withdraw_vrf_routes(bgp_vrf);
}

/*
 * Update and advertise local routes for a VNI. Invoked upon router-id
 * change. Note that the processing is done only on the global route table
 * using routes that already exist in the per-VNI table.
 */
static int update_advertise_vni_routes(struct bgp *bgp, struct bgpevpn *vpn)
{
        struct prefix_evpn p;
        struct bgp_node *rn, *global_rn;
        struct bgp_path_info *pi, *global_pi;
        struct attr *attr;
        afi_t afi = AFI_L2VPN;
        safi_t safi = SAFI_EVPN;

        /* Locate type-3 route for VNI in the per-VNI table and use its
         * attributes to create and advertise the type-3 route for this VNI
         * in the global table.
         *
         * RT-3 only if doing head-end replication
         */
        if (bgp_evpn_vni_flood_mode_get(bgp, vpn)
                                == VXLAN_FLOOD_HEAD_END_REPL) {
                build_evpn_type3_prefix(&p, vpn->originator_ip);
                rn = bgp_node_lookup(vpn->route_table, (struct prefix *)&p);
                if (!rn) /* unexpected */
                        return 0;
                for (pi = bgp_node_get_bgp_path_info(rn); pi; pi = pi->next)
                        if (pi->peer == bgp->peer_self &&
                            pi->type == ZEBRA_ROUTE_BGP
                            && pi->sub_type == BGP_ROUTE_STATIC)
                                break;
                if (!pi) /* unexpected */
                        return 0;
                attr = pi->attr;

                global_rn = bgp_afi_node_get(bgp->rib[afi][safi], afi, safi,
                                             (struct prefix *)&p, &vpn->prd);
                update_evpn_route_entry(bgp, vpn, afi, safi, global_rn, attr,
                                        1, &pi, 0, mac_mobility_seqnum(attr));

                /* Schedule for processing and unlock node. */
                bgp_process(bgp, global_rn, afi, safi);
                bgp_unlock_node(global_rn);
        }

        /* Now, walk this VNI's route table and use the route and its attribute
         * to create and schedule route in global table.
         */
        for (rn = bgp_table_top(vpn->route_table); rn;
             rn = bgp_route_next(rn)) {
                const struct prefix_evpn *evp =
                        (const struct prefix_evpn *)bgp_node_get_prefix(rn);

                /* Identify MAC-IP local routes. */
                if (evp->prefix.route_type != BGP_EVPN_MAC_IP_ROUTE)
                        continue;

                for (pi = bgp_node_get_bgp_path_info(rn); pi; pi = pi->next)
                        if (pi->peer == bgp->peer_self
                            && pi->type == ZEBRA_ROUTE_BGP
                            && pi->sub_type == BGP_ROUTE_STATIC)
                                break;
                if (!pi)
                        continue;

                /* Create route in global routing table using this route entry's
                 * attribute.
                 */
                attr = pi->attr;
                global_rn = bgp_afi_node_get(bgp->rib[afi][safi], afi, safi,
                                             (struct prefix *)evp, &vpn->prd);
                assert(global_rn);
                update_evpn_route_entry(bgp, vpn, afi, safi, global_rn, attr, 1,
                                        &global_pi, 0,
                                        mac_mobility_seqnum(attr));

                /* Schedule for processing and unlock node. */
                bgp_process(bgp, global_rn, afi, safi);
                bgp_unlock_node(global_rn);
        }

        return 0;
}

/*
 * Delete (and withdraw) local routes for a VNI - only from the global
 * table. Invoked upon router-id change.
 */
static int delete_withdraw_vni_routes(struct bgp *bgp, struct bgpevpn *vpn)
{
        int ret;
        struct prefix_evpn p;
        struct bgp_node *global_rn;
        struct bgp_path_info *pi;
        afi_t afi = AFI_L2VPN;
        safi_t safi = SAFI_EVPN;

        /* Delete and withdraw locally learnt type-2 routes (MACIP)
         * for this VNI - from the global table.
         */
        ret = delete_global_type2_routes(bgp, vpn);
        if (ret)
                return ret;

        /* Remove type-3 route for this VNI from global table. */
        build_evpn_type3_prefix(&p, vpn->originator_ip);
        global_rn = bgp_afi_node_lookup(bgp->rib[afi][safi], afi, safi,
                                        (struct prefix *)&p, &vpn->prd);
        if (global_rn) {
                /* Delete route entry in the global EVPN table. */
                delete_evpn_route_entry(bgp, afi, safi, global_rn, &pi);

                /* Schedule for processing - withdraws to peers happen from
                 * this table.
                 */
                if (pi)
                        bgp_process(bgp, global_rn, afi, safi);
                bgp_unlock_node(global_rn);
        }

        return 0;
}

/*
 * Handle router-id change. Update and advertise local routes corresponding
 * to this VNI from peers. Note that this is invoked after updating the
 * router-id. The routes in the per-VNI table are used to create routes in
 * the global table and schedule them.
 */
static void update_router_id_vni(struct hash_bucket *bucket, struct bgp *bgp)
{
        struct bgpevpn *vpn = (struct bgpevpn *)bucket->data;

        /* Skip VNIs with configured RD. */
        if (is_rd_configured(vpn))
                return;

        bgp_evpn_derive_auto_rd(bgp, vpn);
        update_advertise_vni_routes(bgp, vpn);
}

/*
 * Handle router-id change. Delete and withdraw local routes corresponding
 * to this VNI from peers. Note that this is invoked prior to updating
 * the router-id and is done only on the global route table, the routes
 * are needed in the per-VNI table to re-advertise with new router id.
 */
static void withdraw_router_id_vni(struct hash_bucket *bucket, struct bgp *bgp)
{
        struct bgpevpn *vpn = (struct bgpevpn *)bucket->data;

        /* Skip VNIs with configured RD. */
        if (is_rd_configured(vpn))
                return;

        delete_withdraw_vni_routes(bgp, vpn);
}

/*
 * Create RT-3 for a VNI and schedule for processing and advertisement.
 * This is invoked upon flooding mode changing to head-end replication.
 */
static void create_advertise_type3(struct hash_bucket *bucket, void *data)
{
        struct bgpevpn *vpn = bucket->data;
        struct bgp *bgp = data;
        struct prefix_evpn p;

        if (!vpn || !is_vni_live(vpn) ||
                bgp_evpn_vni_flood_mode_get(bgp, vpn)
                                        != VXLAN_FLOOD_HEAD_END_REPL)
                return;

        build_evpn_type3_prefix(&p, vpn->originator_ip);
        if (update_evpn_route(bgp, vpn, &p, 0, 0))
                flog_err(EC_BGP_EVPN_ROUTE_CREATE,
                         "Type3 route creation failure for VNI %u", vpn->vni);
}

/*
 * Delete RT-3 for a VNI and schedule for processing and withdrawal.
 * This is invoked upon flooding mode changing to drop BUM packets.
 */
static void delete_withdraw_type3(struct hash_bucket *bucket, void *data)
{
        struct bgpevpn *vpn = bucket->data;
        struct bgp *bgp = data;
        struct prefix_evpn p;

        if (!vpn || !is_vni_live(vpn))
                return;

        build_evpn_type3_prefix(&p, vpn->originator_ip);
        delete_evpn_route(bgp, vpn, &p);
}

/*
 * Process received EVPN type-2 route (advertise or withdraw).
 */
static int process_type2_route(struct peer *peer, afi_t afi, safi_t safi,
                               struct attr *attr, uint8_t *pfx, int psize,
                               uint32_t addpath_id)
{
        struct prefix_rd prd;
        struct prefix_evpn p;
        struct bgp_route_evpn evpn;
        uint8_t ipaddr_len;
        uint8_t macaddr_len;
        mpls_label_t label[BGP_MAX_LABELS]; /* holds the VNI(s) as in packet */
        uint32_t num_labels = 0;
        uint32_t eth_tag;
        int ret;

        /* Type-2 route should be either 33, 37 or 49 bytes or an
         * additional 3 bytes if there is a second label (VNI):
         * RD (8), ESI (10), Eth Tag (4), MAC Addr Len (1),
         * MAC Addr (6), IP len (1), IP (0, 4 or 16),
         * MPLS Lbl1 (3), MPLS Lbl2 (0 or 3)
         */
        if (psize != 33 && psize != 37 && psize != 49 && psize != 36
            && psize != 40 && psize != 52) {
                flog_err(EC_BGP_EVPN_ROUTE_INVALID,
                         "%u:%s - Rx EVPN Type-2 NLRI with invalid length %d",
                         peer->bgp->vrf_id, peer->host, psize);
                return -1;
        }

        memset(&evpn, 0, sizeof(evpn));

        /* Make prefix_rd */
        prd.family = AF_UNSPEC;
        prd.prefixlen = 64;
        memcpy(&prd.val, pfx, 8);
        pfx += 8;

        /* Make EVPN prefix. */
        memset(&p, 0, sizeof(struct prefix_evpn));
        p.family = AF_EVPN;
        p.prefixlen = EVPN_ROUTE_PREFIXLEN;
        p.prefix.route_type = BGP_EVPN_MAC_IP_ROUTE;

        /* Copy Ethernet Seg Identifier */
        memcpy(&evpn.eth_s_id.val, pfx, ESI_LEN);
        pfx += ESI_LEN;

        /* Copy Ethernet Tag */
        memcpy(&eth_tag, pfx, 4);
        p.prefix.macip_addr.eth_tag = ntohl(eth_tag);
        pfx += 4;

        /* Get the MAC Addr len */
        macaddr_len = *pfx++;

        /* Get the MAC Addr */
        if (macaddr_len == (ETH_ALEN * 8)) {
                memcpy(&p.prefix.macip_addr.mac.octet, pfx, ETH_ALEN);
                pfx += ETH_ALEN;
        } else {
                flog_err(
                        EC_BGP_EVPN_ROUTE_INVALID,
                        "%u:%s - Rx EVPN Type-2 NLRI with unsupported MAC address length %d",
                        peer->bgp->vrf_id, peer->host, macaddr_len);
                return -1;
        }


        /* Get the IP. */
        ipaddr_len = *pfx++;
        if (ipaddr_len != 0 && ipaddr_len != IPV4_MAX_BITLEN
            && ipaddr_len != IPV6_MAX_BITLEN) {
                flog_err(
                        EC_BGP_EVPN_ROUTE_INVALID,
                        "%u:%s - Rx EVPN Type-2 NLRI with unsupported IP address length %d",
                        peer->bgp->vrf_id, peer->host, ipaddr_len);
                return -1;
        }

        if (ipaddr_len) {
                ipaddr_len /= 8; /* Convert to bytes. */
                p.prefix.macip_addr.ip.ipa_type = (ipaddr_len == IPV4_MAX_BYTELEN)
                                               ? IPADDR_V4
                                               : IPADDR_V6;
                memcpy(&p.prefix.macip_addr.ip.ip.addr, pfx, ipaddr_len);
        }
        pfx += ipaddr_len;

        /* Get the VNI(s). Stored as bytes here. */
        num_labels++;
        memset(label, 0, sizeof(label));
        memcpy(&label[0], pfx, BGP_LABEL_BYTES);
        pfx += BGP_LABEL_BYTES;
        psize -= (33 + ipaddr_len);
        /* Do we have a second VNI? */
        if (psize) {
                num_labels++;
                memcpy(&label[1], pfx, BGP_LABEL_BYTES);
                /*
                 * If in future, we are required to access additional fields,
                 * we MUST increment pfx by BGP_LABEL_BYTES in before reading
                 * the next field
                 */
        }

        /* Process the route. */
        if (attr)
                ret = bgp_update(peer, (struct prefix *)&p, addpath_id, attr,
                                 afi, safi, ZEBRA_ROUTE_BGP, BGP_ROUTE_NORMAL,
                                 &prd, &label[0], num_labels, 0, &evpn);
        else
                ret = bgp_withdraw(peer, (struct prefix *)&p, addpath_id, attr,
                                   afi, safi, ZEBRA_ROUTE_BGP, BGP_ROUTE_NORMAL,
                                   &prd, &label[0], num_labels, &evpn);
        return ret;
}

/*
 * Process received EVPN type-3 route (advertise or withdraw).
 */
static int process_type3_route(struct peer *peer, afi_t afi, safi_t safi,
                               struct attr *attr, uint8_t *pfx, int psize,
                               uint32_t addpath_id)
{
        struct prefix_rd prd;
        struct prefix_evpn p;
        uint8_t ipaddr_len;
        uint32_t eth_tag;
        int ret;

        /* Type-3 route should be either 17 or 29 bytes: RD (8), Eth Tag (4),
         * IP len (1) and IP (4 or 16).
         */
        if (psize != 17 && psize != 29) {
                flog_err(EC_BGP_EVPN_ROUTE_INVALID,
                         "%u:%s - Rx EVPN Type-3 NLRI with invalid length %d",
                         peer->bgp->vrf_id, peer->host, psize);
                return -1;
        }

        /* If PMSI is present, log if it is anything other than IR.
         * Note: We just simply ignore the values as it is not clear if
         * doing anything else is better.
         */
        if (attr &&
            (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_PMSI_TUNNEL))) {
                if (attr->pmsi_tnl_type != PMSI_TNLTYPE_INGR_REPL &&
                        attr->pmsi_tnl_type != PMSI_TNLTYPE_PIM_SM) {
                        flog_warn(EC_BGP_EVPN_PMSI_PRESENT,
                                  "%u:%s - Rx EVPN Type-3 NLRI with unsupported PTA %d",
                                  peer->bgp->vrf_id, peer->host,
                                  attr->pmsi_tnl_type);
                }
        }

        /* Make prefix_rd */
        prd.family = AF_UNSPEC;
        prd.prefixlen = 64;
        memcpy(&prd.val, pfx, 8);
        pfx += 8;

        /* Make EVPN prefix. */
        memset(&p, 0, sizeof(struct prefix_evpn));
        p.family = AF_EVPN;
        p.prefixlen = EVPN_ROUTE_PREFIXLEN;
        p.prefix.route_type = BGP_EVPN_IMET_ROUTE;

        /* Copy Ethernet Tag */
        memcpy(&eth_tag, pfx, 4);
        p.prefix.imet_addr.eth_tag = ntohl(eth_tag);
        pfx += 4;

        /* Get the IP. */
        ipaddr_len = *pfx++;
        if (ipaddr_len == IPV4_MAX_BITLEN) {
                p.prefix.imet_addr.ip.ipa_type = IPADDR_V4;
                memcpy(&p.prefix.imet_addr.ip.ip.addr, pfx, IPV4_MAX_BYTELEN);
        } else {
                flog_err(
                        EC_BGP_EVPN_ROUTE_INVALID,
                        "%u:%s - Rx EVPN Type-3 NLRI with unsupported IP address length %d",
                        peer->bgp->vrf_id, peer->host, ipaddr_len);
                return -1;
        }

        /* Process the route. */
        if (attr)
                ret = bgp_update(peer, (struct prefix *)&p, addpath_id, attr,
                                 afi, safi, ZEBRA_ROUTE_BGP, BGP_ROUTE_NORMAL,
                                 &prd, NULL, 0, 0, NULL);
        else
                ret = bgp_withdraw(peer, (struct prefix *)&p, addpath_id, attr,
                                   afi, safi, ZEBRA_ROUTE_BGP, BGP_ROUTE_NORMAL,
                                   &prd, NULL, 0, NULL);
        return ret;
}

/*
 * Process received EVPN type-4 route (advertise or withdraw).
 */
static int process_type4_route(struct peer *peer, afi_t afi, safi_t safi,
                               struct attr *attr, uint8_t *pfx, int psize,
                               uint32_t addpath_id)
{
        int ret;
        esi_t esi;
        uint8_t ipaddr_len;
        struct in_addr vtep_ip;
        struct prefix_rd prd;
        struct prefix_evpn p;

        /* Type-4 route should be either 23 or 35 bytes
         *  RD (8), ESI (10), ip-len (1), ip (4 or 16)
         */
        if (psize != 23 && psize != 35) {
                flog_err(EC_BGP_EVPN_ROUTE_INVALID,
                         "%u:%s - Rx EVPN Type-4 NLRI with invalid length %d",
                         peer->bgp->vrf_id, peer->host, psize);
                return -1;
        }

        /* Make prefix_rd */
        prd.family = AF_UNSPEC;
        prd.prefixlen = 64;
        memcpy(&prd.val, pfx, 8);
        pfx += 8;

        /* get the ESI */
        memcpy(&esi, pfx, ESI_BYTES);
        pfx += ESI_BYTES;


        /* Get the IP. */
        ipaddr_len = *pfx++;
        if (ipaddr_len == IPV4_MAX_BITLEN) {
                memcpy(&vtep_ip, pfx, IPV4_MAX_BYTELEN);
        } else {
                flog_err(
                        EC_BGP_EVPN_ROUTE_INVALID,
                        "%u:%s - Rx EVPN Type-4 NLRI with unsupported IP address length %d",
                        peer->bgp->vrf_id, peer->host, ipaddr_len);
                return -1;
        }

        build_evpn_type4_prefix(&p, &esi, vtep_ip);
        /* Process the route. */
        if (attr) {
                ret = bgp_update(peer, (struct prefix *)&p, addpath_id, attr,
                                 afi, safi, ZEBRA_ROUTE_BGP, BGP_ROUTE_NORMAL,
                                 &prd, NULL, 0, 0, NULL);
        } else {
                ret = bgp_withdraw(peer, (struct prefix *)&p, addpath_id, attr,
                                   afi, safi, ZEBRA_ROUTE_BGP, BGP_ROUTE_NORMAL,
                                   &prd, NULL, 0, NULL);
        }
        return ret;
}


/*
 * Process received EVPN type-5 route (advertise or withdraw).
 */
static int process_type5_route(struct peer *peer, afi_t afi, safi_t safi,
                               struct attr *attr, uint8_t *pfx, int psize,
                               uint32_t addpath_id)
{
        struct prefix_rd prd;
        struct prefix_evpn p;
        struct bgp_route_evpn evpn;
        uint8_t ippfx_len;
        uint32_t eth_tag;
        mpls_label_t label; /* holds the VNI as in the packet */
        int ret;
        afi_t gw_afi;
        bool is_valid_update = false;

        /* Type-5 route should be 34 or 58 bytes:
         * RD (8), ESI (10), Eth Tag (4), IP len (1), IP (4 or 16),
         * GW (4 or 16) and VNI (3).
         * Note that the IP and GW should both be IPv4 or both IPv6.
         */
        if (psize != 34 && psize != 58) {
                flog_err(EC_BGP_EVPN_ROUTE_INVALID,
                         "%u:%s - Rx EVPN Type-5 NLRI with invalid length %d",
                         peer->bgp->vrf_id, peer->host, psize);
                return -1;
        }

        /* Make prefix_rd */
        prd.family = AF_UNSPEC;
        prd.prefixlen = 64;
        memcpy(&prd.val, pfx, 8);
        pfx += 8;

        /* Make EVPN prefix. */
        memset(&p, 0, sizeof(struct prefix_evpn));
        p.family = AF_EVPN;
        p.prefixlen = EVPN_ROUTE_PREFIXLEN;
        p.prefix.route_type = BGP_EVPN_IP_PREFIX_ROUTE;

        /* Additional information outside of prefix - ESI and GW IP */
        memset(&evpn, 0, sizeof(evpn));

        /* Fetch ESI */
        memcpy(&evpn.eth_s_id.val, pfx, 10);
        pfx += 10;

        /* Fetch Ethernet Tag. */
        memcpy(&eth_tag, pfx, 4);
        p.prefix.prefix_addr.eth_tag = ntohl(eth_tag);
        pfx += 4;

        /* Fetch IP prefix length. */
        ippfx_len = *pfx++;
        if (ippfx_len > IPV6_MAX_BITLEN) {
                flog_err(
                        EC_BGP_EVPN_ROUTE_INVALID,
                        "%u:%s - Rx EVPN Type-5 NLRI with invalid IP Prefix length %d",
                        peer->bgp->vrf_id, peer->host, ippfx_len);
                return -1;
        }
        p.prefix.prefix_addr.ip_prefix_length = ippfx_len;

        /* Determine IPv4 or IPv6 prefix */
        /* Since the address and GW are from the same family, this just becomes
         * a simple check on the total size.
         */
        if (psize == 34) {
                SET_IPADDR_V4(&p.prefix.prefix_addr.ip);
                memcpy(&p.prefix.prefix_addr.ip.ipaddr_v4, pfx, 4);
                pfx += 4;
                memcpy(&evpn.gw_ip.ipv4, pfx, 4);
                pfx += 4;
                gw_afi = AF_INET;
        } else {
                SET_IPADDR_V6(&p.prefix.prefix_addr.ip);
                memcpy(&p.prefix.prefix_addr.ip.ipaddr_v6, pfx, 16);
                pfx += 16;
                memcpy(&evpn.gw_ip.ipv6, pfx, 16);
                pfx += 16;
                gw_afi = AF_INET6;
        }

        /* Get the VNI (in MPLS label field). Stored as bytes here. */
        memset(&label, 0, sizeof(label));
        memcpy(&label, pfx, BGP_LABEL_BYTES);

        /*
         * If in future, we are required to access additional fields,
         * we MUST increment pfx by BGP_LABEL_BYTES in before reading the next
         * field
         */

        if (attr) {
                is_valid_update = true;
                if (is_zero_mac(&attr->rmac) && is_zero_esi(&evpn.eth_s_id) &&
                    is_zero_gw_ip(&evpn.gw_ip, gw_afi))
                        is_valid_update = false;

                if (is_mcast_mac(&attr->rmac) || is_bcast_mac(&attr->rmac))
                        is_valid_update = false;
        }

        /* Process the route. */
        if (is_valid_update)
                ret = bgp_update(peer, (struct prefix *)&p, addpath_id, attr,
                                 afi, safi, ZEBRA_ROUTE_BGP, BGP_ROUTE_NORMAL,
                                 &prd, &label, 1, 0, &evpn);
        else
                ret = bgp_withdraw(peer, (struct prefix *)&p, addpath_id, attr,
                                   afi, safi, ZEBRA_ROUTE_BGP, BGP_ROUTE_NORMAL,
                                   &prd, &label, 1, &evpn);

        return ret;
}

static void evpn_mpattr_encode_type5(struct stream *s, const struct prefix *p,
                                     const struct prefix_rd *prd,
                                     mpls_label_t *label, uint32_t num_labels,
                                     struct attr *attr)
{
        int len;
        char temp[16];
        const struct evpn_addr *p_evpn_p;

        memset(&temp, 0, 16);
        if (p->family != AF_EVPN)
                return;
        p_evpn_p = &(p->u.prefix_evpn);

        /* len denites the total len of IP and GW-IP in the route
           IP and GW-IP have to be both ipv4 or ipv6
         */
        if (IS_IPADDR_V4(&p_evpn_p->prefix_addr.ip))
                len = 8; /* IP and GWIP are both ipv4 */
        else
                len = 32; /* IP and GWIP are both ipv6 */
        /* Prefix contains RD, ESI, EthTag, IP length, IP, GWIP and VNI */
        stream_putc(s, 8 + 10 + 4 + 1 + len + 3);
        stream_put(s, prd->val, 8);
        if (attr)
                stream_put(s, &(attr->evpn_overlay.eth_s_id), 10);
        else
                stream_put(s, &temp, 10);
        stream_putl(s, p_evpn_p->prefix_addr.eth_tag);
        stream_putc(s, p_evpn_p->prefix_addr.ip_prefix_length);
        if (IS_IPADDR_V4(&p_evpn_p->prefix_addr.ip))
                stream_put_ipv4(s, p_evpn_p->prefix_addr.ip.ipaddr_v4.s_addr);
        else
                stream_put(s, &p_evpn_p->prefix_addr.ip.ipaddr_v6, 16);
        if (attr) {
                if (IS_IPADDR_V4(&p_evpn_p->prefix_addr.ip))
                        stream_put_ipv4(s,
                                        attr->evpn_overlay.gw_ip.ipv4.s_addr);
                else
                        stream_put(s, &(attr->evpn_overlay.gw_ip.ipv6), 16);
        } else {
                if (IS_IPADDR_V4(&p_evpn_p->prefix_addr.ip))
                        stream_put_ipv4(s, 0);
                else
                        stream_put(s, &temp, 16);
        }

        if (num_labels)
                stream_put(s, label, 3);
        else
                stream_put3(s, 0);
}

/*
 * Cleanup specific VNI upon EVPN (advertise-all-vni) being disabled.
 */
static void cleanup_vni_on_disable(struct hash_bucket *bucket, struct bgp *bgp)
{
        struct bgpevpn *vpn = (struct bgpevpn *)bucket->data;

        /* Remove EVPN routes and schedule for processing. */
        delete_routes_for_vni(bgp, vpn);

        /* Clear "live" flag and see if hash needs to be freed. */
        UNSET_FLAG(vpn->flags, VNI_FLAG_LIVE);
        if (!is_vni_configured(vpn))
                bgp_evpn_free(bgp, vpn);
}

/*
 * Free a VNI entry; iterator function called during cleanup.
 */
static void free_vni_entry(struct hash_bucket *bucket, struct bgp *bgp)
{
        struct bgpevpn *vpn = (struct bgpevpn *)bucket->data;

        delete_all_vni_routes(bgp, vpn);
        bgp_evpn_free(bgp, vpn);
}

/*
 * Derive AUTO import RT for BGP VRF - L3VNI
 */
static void evpn_auto_rt_import_add_for_vrf(struct bgp *bgp_vrf)
{
        struct bgp *bgp_evpn = NULL;

        form_auto_rt(bgp_vrf, bgp_vrf->l3vni, bgp_vrf->vrf_import_rtl);
        UNSET_FLAG(bgp_vrf->vrf_flags, BGP_VRF_IMPORT_RT_CFGD);

        /* Map RT to VRF */
        bgp_evpn = bgp_get_evpn();
        if (!bgp_evpn)
                return;
        bgp_evpn_map_vrf_to_its_rts(bgp_vrf);
}

/*
 * Delete AUTO import RT from BGP VRF - L3VNI
 */
static void evpn_auto_rt_import_delete_for_vrf(struct bgp *bgp_vrf)
{
        evpn_rt_delete_auto(bgp_vrf, bgp_vrf->l3vni, bgp_vrf->vrf_import_rtl);
}

/*
 * Derive AUTO export RT for BGP VRF - L3VNI
 */
static void evpn_auto_rt_export_add_for_vrf(struct bgp *bgp_vrf)
{
        UNSET_FLAG(bgp_vrf->vrf_flags, BGP_VRF_EXPORT_RT_CFGD);
        form_auto_rt(bgp_vrf, bgp_vrf->l3vni, bgp_vrf->vrf_export_rtl);
}

/*
 * Delete AUTO export RT from BGP VRF - L3VNI
 */
static void evpn_auto_rt_export_delete_for_vrf(struct bgp *bgp_vrf)
{
        evpn_rt_delete_auto(bgp_vrf, bgp_vrf->l3vni, bgp_vrf->vrf_export_rtl);
}

static void bgp_evpn_handle_export_rt_change_for_vrf(struct bgp *bgp_vrf)
{
        struct bgp *bgp_evpn = NULL;
        struct listnode *node = NULL;
        struct bgpevpn *vpn = NULL;

        bgp_evpn = bgp_get_evpn();
        if (!bgp_evpn)
                return;

        /* update all type-5 routes */
        update_advertise_vrf_routes(bgp_vrf);

        /* update all type-2 routes */
        for (ALL_LIST_ELEMENTS_RO(bgp_vrf->l2vnis, node, vpn))
                update_routes_for_vni(bgp_evpn, vpn);
}

/*
 * Handle autort change for a given VNI.
 */
static void update_autort_vni(struct hash_bucket *bucket, struct bgp *bgp)
{
        struct bgpevpn *vpn = bucket->data;

        if (!is_import_rt_configured(vpn)) {
                if (is_vni_live(vpn))
                        bgp_evpn_uninstall_routes(bgp, vpn);
                bgp_evpn_unmap_vni_from_its_rts(bgp, vpn);
                list_delete_all_node(vpn->import_rtl);
                bgp_evpn_derive_auto_rt_import(bgp, vpn);
                if (is_vni_live(vpn))
                        bgp_evpn_install_routes(bgp, vpn);
        }
        if (!is_export_rt_configured(vpn)) {
                list_delete_all_node(vpn->export_rtl);
                bgp_evpn_derive_auto_rt_export(bgp, vpn);
                if (is_vni_live(vpn))
                        bgp_evpn_handle_export_rt_change(bgp, vpn);
        }
}

/*
 * Public functions.
 */

/* withdraw type-5 route corresponding to ip prefix */
void bgp_evpn_withdraw_type5_route(struct bgp *bgp_vrf, const struct prefix *p,
                                   afi_t afi, safi_t safi)
{
        int ret = 0;
        struct prefix_evpn evp;
        char buf[PREFIX_STRLEN];

        build_type5_prefix_from_ip_prefix(&evp, p);
        ret = delete_evpn_type5_route(bgp_vrf, &evp);
        if (ret) {
                flog_err(
                        EC_BGP_EVPN_ROUTE_DELETE,
                        "%u failed to delete type-5 route for prefix %s in vrf %s",
                        bgp_vrf->vrf_id, prefix2str(p, buf, sizeof(buf)),
                        vrf_id_to_name(bgp_vrf->vrf_id));
        }
}

/* withdraw all type-5 routes for an address family */
void bgp_evpn_withdraw_type5_routes(struct bgp *bgp_vrf, afi_t afi, safi_t safi)
{
        struct bgp_table *table = NULL;
        struct bgp_node *rn = NULL;
        struct bgp_path_info *pi;

        table = bgp_vrf->rib[afi][safi];
        for (rn = bgp_table_top(table); rn; rn = bgp_route_next(rn)) {
                /* Only care about "selected" routes. Also ensure that
                 * these are routes that are injectable into EVPN.
                 */
                /* TODO: Support for AddPath for EVPN. */
                for (pi = bgp_node_get_bgp_path_info(rn); pi; pi = pi->next) {
                        if (CHECK_FLAG(pi->flags, BGP_PATH_SELECTED)
                            && is_route_injectable_into_evpn(pi)) {
                                bgp_evpn_withdraw_type5_route(
                                        bgp_vrf, bgp_node_get_prefix(rn), afi,
                                        safi);
                                break;
                        }
                }
        }
}

/*
 * evpn - enable advertisement of default g/w
 */
void bgp_evpn_install_uninstall_default_route(struct bgp *bgp_vrf, afi_t afi,
                                              safi_t safi, bool add)
{
        struct prefix ip_prefix;

        /* form the default prefix 0.0.0.0/0 */
        memset(&ip_prefix, 0, sizeof(struct prefix));
        ip_prefix.family = afi2family(afi);

        if (add) {
                bgp_evpn_advertise_type5_route(bgp_vrf, &ip_prefix,
                                               NULL, afi, safi);
        } else {
                bgp_evpn_withdraw_type5_route(bgp_vrf, &ip_prefix,
                                              afi, safi);
        }
}


/*
 * Advertise IP prefix as type-5 route. The afi/safi and src_attr passed
 * to this function correspond to those of the source IP prefix (best
 * path in the case of the attr. In the case of a local prefix (when we
 * are advertising local subnets), the src_attr will be NULL.
 */
void bgp_evpn_advertise_type5_route(struct bgp *bgp_vrf, const struct prefix *p,
                                    struct attr *src_attr, afi_t afi,
                                    safi_t safi)
{
        int ret = 0;
        struct prefix_evpn evp;
        char buf[PREFIX_STRLEN];

        build_type5_prefix_from_ip_prefix(&evp, p);
        ret = update_evpn_type5_route(bgp_vrf, &evp, src_attr);
        if (ret)
                flog_err(EC_BGP_EVPN_ROUTE_CREATE,
                         "%u: Failed to create type-5 route for prefix %s",
                         bgp_vrf->vrf_id, prefix2str(p, buf, sizeof(buf)));
}

/* Inject all prefixes of a particular address-family (currently, IPv4 or
 * IPv6 unicast) into EVPN as type-5 routes. This is invoked when the
 * advertisement is enabled.
 */
void bgp_evpn_advertise_type5_routes(struct bgp *bgp_vrf, afi_t afi,
                                     safi_t safi)
{
        struct bgp_table *table = NULL;
        struct bgp_node *rn = NULL;
        struct bgp_path_info *pi;

        table = bgp_vrf->rib[afi][safi];
        for (rn = bgp_table_top(table); rn; rn = bgp_route_next(rn)) {
                /* Need to identify the "selected" route entry to use its
                 * attribute. Also, ensure that the route is injectable
                 * into EVPN.
                 * TODO: Support for AddPath for EVPN.
                 */
                for (pi = bgp_node_get_bgp_path_info(rn); pi; pi = pi->next) {
                        if (CHECK_FLAG(pi->flags, BGP_PATH_SELECTED)
                            && is_route_injectable_into_evpn(pi)) {

                                /* apply the route-map */
                                if (bgp_vrf->adv_cmd_rmap[afi][safi].map) {
                                        route_map_result_t ret;
                                        struct bgp_path_info tmp_pi;
                                        struct bgp_path_info_extra tmp_pie;
                                        struct attr tmp_attr;

                                        tmp_attr = *pi->attr;

                                        /* Fill temp path_info */
                                        prep_for_rmap_apply(
                                                &tmp_pi, &tmp_pie, rn, pi,
                                                pi->peer, &tmp_attr);

                                        RESET_FLAG(tmp_attr.rmap_change_flags);

                                        ret = route_map_apply(
                                                bgp_vrf->adv_cmd_rmap[afi][safi]
                                                        .map,
                                                bgp_node_get_prefix(rn),
                                                RMAP_BGP, &tmp_pi);
                                        if (ret == RMAP_DENYMATCH) {
                                                bgp_attr_flush(&tmp_attr);
                                                continue;
                                        }
                                        bgp_evpn_advertise_type5_route(
                                                bgp_vrf,
                                                bgp_node_get_prefix(rn),
                                                &tmp_attr, afi, safi);
                                } else
                                        bgp_evpn_advertise_type5_route(
                                                bgp_vrf,
                                                bgp_node_get_prefix(rn),
                                                pi->attr, afi, safi);
                                break;
                        }
                }
        }
}

void evpn_rt_delete_auto(struct bgp *bgp, vni_t vni, struct list *rtl)
{
        struct listnode *node, *nnode, *node_to_del;
        struct ecommunity *ecom, *ecom_auto;
        struct ecommunity_val eval;

        if (bgp->advertise_autort_rfc8365)
                vni |= EVPN_AUTORT_VXLAN;
        encode_route_target_as((bgp->as & 0xFFFF), vni, &eval);

        ecom_auto = ecommunity_new();
        ecommunity_add_val(ecom_auto, &eval, false, false);
        node_to_del = NULL;

        for (ALL_LIST_ELEMENTS(rtl, node, nnode, ecom)) {
                if (ecommunity_match(ecom, ecom_auto)) {
                        ecommunity_free(&ecom);
                        node_to_del = node;
                }
        }

        if (node_to_del)
                list_delete_node(rtl, node_to_del);

        ecommunity_free(&ecom_auto);
}

void bgp_evpn_configure_import_rt_for_vrf(struct bgp *bgp_vrf,
                                          struct ecommunity *ecomadd)
{
        /* uninstall routes from vrf */
        if (is_l3vni_live(bgp_vrf))
                uninstall_routes_for_vrf(bgp_vrf);

        /* Cleanup the RT to VRF mapping */
        bgp_evpn_unmap_vrf_from_its_rts(bgp_vrf);

        /* Remove auto generated RT */
        evpn_auto_rt_import_delete_for_vrf(bgp_vrf);

        /* Add the newly configured RT to RT list */
        listnode_add_sort(bgp_vrf->vrf_import_rtl, ecomadd);
        SET_FLAG(bgp_vrf->vrf_flags, BGP_VRF_IMPORT_RT_CFGD);

        /* map VRF to its RTs and install routes matching the new RTs */
        if (is_l3vni_live(bgp_vrf)) {
                bgp_evpn_map_vrf_to_its_rts(bgp_vrf);
                install_routes_for_vrf(bgp_vrf);
        }
}

void bgp_evpn_unconfigure_import_rt_for_vrf(struct bgp *bgp_vrf,
                                            struct ecommunity *ecomdel)
{
        struct listnode *node = NULL, *nnode = NULL, *node_to_del = NULL;
        struct ecommunity *ecom = NULL;

        /* uninstall routes from vrf */
        if (is_l3vni_live(bgp_vrf))
                uninstall_routes_for_vrf(bgp_vrf);

        /* Cleanup the RT to VRF mapping */
        bgp_evpn_unmap_vrf_from_its_rts(bgp_vrf);

        /* remove the RT from the RT list */
        for (ALL_LIST_ELEMENTS(bgp_vrf->vrf_import_rtl, node, nnode, ecom)) {
                if (ecommunity_match(ecom, ecomdel)) {
                        ecommunity_free(&ecom);
                        node_to_del = node;
                        break;
                }
        }

        if (node_to_del)
                list_delete_node(bgp_vrf->vrf_import_rtl, node_to_del);

        assert(bgp_vrf->vrf_import_rtl);
        /* fallback to auto import rt, if this was the last RT */
        if (bgp_vrf->vrf_import_rtl && list_isempty(bgp_vrf->vrf_import_rtl)) {
                UNSET_FLAG(bgp_vrf->vrf_flags, BGP_VRF_IMPORT_RT_CFGD);
                evpn_auto_rt_import_add_for_vrf(bgp_vrf);
        }

        /* map VRFs to its RTs and install routes matching this new RT */
        if (is_l3vni_live(bgp_vrf)) {
                bgp_evpn_map_vrf_to_its_rts(bgp_vrf);
                install_routes_for_vrf(bgp_vrf);
        }
}

void bgp_evpn_configure_export_rt_for_vrf(struct bgp *bgp_vrf,
                                          struct ecommunity *ecomadd)
{
        /* remove auto-generated RT */
        evpn_auto_rt_export_delete_for_vrf(bgp_vrf);

        /* Add the new RT to the RT list */
        listnode_add_sort(bgp_vrf->vrf_export_rtl, ecomadd);
        SET_FLAG(bgp_vrf->vrf_flags, BGP_VRF_EXPORT_RT_CFGD);

        bgp_evpn_handle_export_rt_change_for_vrf(bgp_vrf);
}

void bgp_evpn_unconfigure_export_rt_for_vrf(struct bgp *bgp_vrf,
                                            struct ecommunity *ecomdel)
{
        struct listnode *node = NULL, *nnode = NULL, *node_to_del = NULL;
        struct ecommunity *ecom = NULL;

        /* Remove the RT from the RT list */
        for (ALL_LIST_ELEMENTS(bgp_vrf->vrf_export_rtl, node, nnode, ecom)) {
                if (ecommunity_match(ecom, ecomdel)) {
                        ecommunity_free(&ecom);
                        node_to_del = node;
                        break;
                }
        }

        if (node_to_del)
                list_delete_node(bgp_vrf->vrf_export_rtl, node_to_del);

        /*
         * Temporary assert to make SA happy.
         * The ALL_LIST_ELEMENTS macro above has a NULL check
         * which means that SA is going to complain about
         * the list_isempty call, which doesn't NULL check.
         * So until we get this situation cleaned up, here
         * we are.
         */
        assert(bgp_vrf->vrf_export_rtl);

        /* fall back to auto-generated RT if this was the last RT */
        if (list_isempty(bgp_vrf->vrf_export_rtl)) {
                UNSET_FLAG(bgp_vrf->vrf_flags, BGP_VRF_EXPORT_RT_CFGD);
                evpn_auto_rt_export_add_for_vrf(bgp_vrf);
        }

        bgp_evpn_handle_export_rt_change_for_vrf(bgp_vrf);
}

/*
 * Handle change to BGP router id. This is invoked twice by the change
 * handler, first before the router id has been changed and then after
 * the router id has been changed. The first invocation will result in
 * local routes for all VNIs/VRF being deleted and withdrawn and the next
 * will result in the routes being re-advertised.
 */
void bgp_evpn_handle_router_id_update(struct bgp *bgp, int withdraw)
{
        struct listnode *node;
        struct bgp *bgp_vrf;

        if (withdraw) {

                /* delete and withdraw all the type-5 routes
                   stored in the global table for this vrf
                 */
                withdraw_router_id_vrf(bgp);

                /* delete all the VNI routes (type-2/type-3) routes for all the
                 * L2-VNIs
                 */
                hash_iterate(bgp->vnihash,
                             (void (*)(struct hash_bucket *,
                                       void *))withdraw_router_id_vni,
                             bgp);

                if (bgp->inst_type == BGP_INSTANCE_TYPE_DEFAULT) {
                        for (ALL_LIST_ELEMENTS_RO(bm->bgp, node, bgp_vrf)) {
                                if (bgp_vrf->evpn_info->advertise_pip &&
                                    (bgp_vrf->evpn_info->pip_ip_static.s_addr
                                     == INADDR_ANY))
                                        bgp_vrf->evpn_info->pip_ip.s_addr
                                                = INADDR_ANY;
                        }
                }
        } else {

                /* Assign new default instance router-id */
                if (bgp->inst_type == BGP_INSTANCE_TYPE_DEFAULT) {
                        for (ALL_LIST_ELEMENTS_RO(bm->bgp, node, bgp_vrf)) {
                                if (bgp_vrf->evpn_info->advertise_pip &&
                                    (bgp_vrf->evpn_info->pip_ip_static.s_addr
                                     == INADDR_ANY)) {
                                        bgp_vrf->evpn_info->pip_ip =
                                                bgp->router_id;
                                        /* advertise type-5 routes with
                                         * new nexthop
                                         */
                                        update_advertise_vrf_routes(bgp_vrf);
                                }
                        }
                }

                /* advertise all routes in the vrf as type-5 routes with the new
                 * RD
                 */
                update_router_id_vrf(bgp);

                /* advertise all the VNI routes (type-2/type-3) routes with the
                 * new RD
                 */
                hash_iterate(bgp->vnihash,
                             (void (*)(struct hash_bucket *,
                                       void *))update_router_id_vni,
                             bgp);
        }
}

/*
 * Handle change to auto-RT algorithm - update and advertise local routes.
 */
void bgp_evpn_handle_autort_change(struct bgp *bgp)
{
        hash_iterate(bgp->vnihash,
                     (void (*)(struct hash_bucket *,
                               void*))update_autort_vni,
                     bgp);
}

/*
 * Handle change to export RT - update and advertise local routes.
 */
int bgp_evpn_handle_export_rt_change(struct bgp *bgp, struct bgpevpn *vpn)
{
        return update_routes_for_vni(bgp, vpn);
}

void bgp_evpn_handle_vrf_rd_change(struct bgp *bgp_vrf, int withdraw)
{
        if (withdraw)
                delete_withdraw_vrf_routes(bgp_vrf);
        else
                update_advertise_vrf_routes(bgp_vrf);
}

/*
 * Handle change to RD. This is invoked twice by the change handler,
 * first before the RD has been changed and then after the RD has
 * been changed. The first invocation will result in local routes
 * of this VNI being deleted and withdrawn and the next will result
 * in the routes being re-advertised.
 */
void bgp_evpn_handle_rd_change(struct bgp *bgp, struct bgpevpn *vpn,
                               int withdraw)
{
        if (withdraw)
                delete_withdraw_vni_routes(bgp, vpn);
        else
                update_advertise_vni_routes(bgp, vpn);
}

/*
 * Install routes for this VNI. Invoked upon change to Import RT.
 */
int bgp_evpn_install_routes(struct bgp *bgp, struct bgpevpn *vpn)
{
        return install_routes_for_vni(bgp, vpn);
}

/*
 * Uninstall all routes installed for this VNI. Invoked upon change
 * to Import RT.
 */
int bgp_evpn_uninstall_routes(struct bgp *bgp, struct bgpevpn *vpn)
{
        return uninstall_routes_for_vni(bgp, vpn);
}

/*
 * TODO: Hardcoded for a maximum of 2 VNIs right now
 */
char *bgp_evpn_label2str(mpls_label_t *label, uint32_t num_labels, char *buf,
                         int len)
{
        vni_t vni1, vni2;

        vni1 = label2vni(label);
        if (num_labels == 2) {
                vni2 = label2vni(label + 1);
                snprintf(buf, len, "%u/%u", vni1, vni2);
        } else
                snprintf(buf, len, "%u", vni1);
        return buf;
}

/*
 * Function to convert evpn route to json format.
 * NOTE: We don't use prefix2str as the output here is a bit different.
 */
void bgp_evpn_route2json(const struct prefix_evpn *p, json_object *json)
{
        char buf1[ETHER_ADDR_STRLEN];
        char buf2[PREFIX2STR_BUFFER];
        uint8_t family;
        uint8_t prefixlen;

        if (!json)
                return;

        json_object_int_add(json, "routeType", p->prefix.route_type);

        switch (p->prefix.route_type) {
        case BGP_EVPN_MAC_IP_ROUTE:
                json_object_int_add(json, "ethTag",
                        p->prefix.macip_addr.eth_tag);
                json_object_int_add(json, "macLen", 8 * ETH_ALEN);
                json_object_string_add(json, "mac",
                        prefix_mac2str(&p->prefix.macip_addr.mac, buf1,
                        sizeof(buf1)));

                if (!is_evpn_prefix_ipaddr_none(p)) {
                        family = is_evpn_prefix_ipaddr_v4(p) ? AF_INET :
                                AF_INET6;
                        prefixlen = (family == AF_INET) ?
                                IPV4_MAX_BITLEN : IPV6_MAX_BITLEN;
                        inet_ntop(family, &p->prefix.macip_addr.ip.ip.addr,
                                buf2, PREFIX2STR_BUFFER);
                        json_object_int_add(json, "ipLen", prefixlen);
                        json_object_string_add(json, "ip", buf2);
                }
        break;

        case BGP_EVPN_IMET_ROUTE:
                json_object_int_add(json, "ethTag",
                        p->prefix.imet_addr.eth_tag);
                family = is_evpn_prefix_ipaddr_v4(p) ? AF_INET : AF_INET6;
                prefixlen = (family == AF_INET) ?  IPV4_MAX_BITLEN :
                        IPV6_MAX_BITLEN;
                inet_ntop(family, &p->prefix.imet_addr.ip.ip.addr, buf2,
                        PREFIX2STR_BUFFER);
                json_object_int_add(json, "ipLen", prefixlen);
                json_object_string_add(json, "ip", buf2);
        break;

        case BGP_EVPN_IP_PREFIX_ROUTE:
                json_object_int_add(json, "ethTag",
                        p->prefix.prefix_addr.eth_tag);
                family = is_evpn_prefix_ipaddr_v4(p) ? AF_INET : AF_INET6;
                inet_ntop(family, &p->prefix.prefix_addr.ip.ip.addr,
                          buf2, sizeof(buf2));
                json_object_int_add(json, "ipLen",
                                    p->prefix.prefix_addr.ip_prefix_length);
                json_object_string_add(json, "ip", buf2);
        break;

        default:
        break;
        }
}

/*
 * Function to convert evpn route to string.
 * NOTE: We don't use prefix2str as the output here is a bit different.
 */
char *bgp_evpn_route2str(const struct prefix_evpn *p, char *buf, int len)
{
        char buf1[ETHER_ADDR_STRLEN];
        char buf2[PREFIX2STR_BUFFER];
        char buf3[ESI_STR_LEN];

        if (p->prefix.route_type == BGP_EVPN_IMET_ROUTE) {
                snprintf(buf, len, "[%d]:[%d]:[%d]:[%s]", p->prefix.route_type,
                         p->prefix.imet_addr.eth_tag,
                         is_evpn_prefix_ipaddr_v4(p) ? IPV4_MAX_BITLEN
                                                     : IPV6_MAX_BITLEN,
                         inet_ntoa(p->prefix.imet_addr.ip.ipaddr_v4));
        } else if (p->prefix.route_type == BGP_EVPN_MAC_IP_ROUTE) {
                if (is_evpn_prefix_ipaddr_none(p))
                        snprintf(buf, len, "[%d]:[%d]:[%d]:[%s]",
                                 p->prefix.route_type,
                                 p->prefix.macip_addr.eth_tag,
                                 8 * ETH_ALEN,
                                 prefix_mac2str(&p->prefix.macip_addr.mac, buf1,
                                                sizeof(buf1)));
                else {
                        uint8_t family;

                        family = is_evpn_prefix_ipaddr_v4(p) ? AF_INET
                                                             : AF_INET6;
                        snprintf(buf, len, "[%d]:[%d]:[%d]:[%s]:[%d]:[%s]",
                                 p->prefix.route_type,
                                 p->prefix.macip_addr.eth_tag,
                                 8 * ETH_ALEN,
                                 prefix_mac2str(&p->prefix.macip_addr.mac, buf1,
                                                sizeof(buf1)),
                                 family == AF_INET ? IPV4_MAX_BITLEN
                                                   : IPV6_MAX_BITLEN,
                                 inet_ntop(family,
                                           &p->prefix.macip_addr.ip.ip.addr,
                                           buf2,
                                           PREFIX2STR_BUFFER));
                }
        } else if (p->prefix.route_type == BGP_EVPN_IP_PREFIX_ROUTE) {
                snprintf(buf, len, "[%d]:[%d]:[%d]:[%s]",
                         p->prefix.route_type,
                         p->prefix.prefix_addr.eth_tag,
                         p->prefix.prefix_addr.ip_prefix_length,
                         is_evpn_prefix_ipaddr_v4(p)
                                 ? inet_ntoa(p->prefix.prefix_addr.ip.ipaddr_v4)
                                 : inet6_ntoa(p->prefix.prefix_addr.ip.ipaddr_v6));
        } else if (p->prefix.route_type == BGP_EVPN_ES_ROUTE) {
                snprintf(buf, len, "[%d]:[%s]:[%d]:[%s]",
                         p->prefix.route_type,
                         esi_to_str(&p->prefix.es_addr.esi, buf3, sizeof(buf3)),
                         is_evpn_prefix_ipaddr_v4(p) ? IPV4_MAX_BITLEN
                                                     : IPV6_MAX_BITLEN,
                         inet_ntoa(p->prefix.es_addr.ip.ipaddr_v4));
        } else {
                /* For EVPN route types not supported yet. */
                snprintf(buf, len, "(unsupported route type %d)",
                         p->prefix.route_type);
        }

        return (buf);
}

/*
 * Encode EVPN prefix in Update (MP_REACH)
 */
void bgp_evpn_encode_prefix(struct stream *s, const struct prefix *p,
                            const struct prefix_rd *prd, mpls_label_t *label,
                            uint32_t num_labels, struct attr *attr,
                            int addpath_encode, uint32_t addpath_tx_id)
{
        struct prefix_evpn *evp = (struct prefix_evpn *)p;
        int len, ipa_len = 0;

        if (addpath_encode)
                stream_putl(s, addpath_tx_id);

        /* Route type */
        stream_putc(s, evp->prefix.route_type);

        switch (evp->prefix.route_type) {
        case BGP_EVPN_MAC_IP_ROUTE:
                if (is_evpn_prefix_ipaddr_v4(evp))
                        ipa_len = IPV4_MAX_BYTELEN;
                else if (is_evpn_prefix_ipaddr_v6(evp))
                        ipa_len = IPV6_MAX_BYTELEN;
                /* RD, ESI, EthTag, MAC+len, IP len, [IP], 1 VNI */
                len = 8 + 10 + 4 + 1 + 6 + 1 + ipa_len + 3;
                if (ipa_len && num_labels > 1) /* There are 2 VNIs */
                        len += 3;
                stream_putc(s, len);
                stream_put(s, prd->val, 8);   /* RD */
                if (attr)
                        stream_put(s, &attr->evpn_overlay.eth_s_id, ESI_LEN);
                else
                        stream_put(s, 0, 10);
                stream_putl(s, evp->prefix.macip_addr.eth_tag); /* Ethernet Tag ID */
                stream_putc(s, 8 * ETH_ALEN); /* Mac Addr Len - bits */
                stream_put(s, evp->prefix.macip_addr.mac.octet, 6); /* Mac Addr */
                stream_putc(s, 8 * ipa_len); /* IP address Length */
                if (ipa_len) /* IP */
                        stream_put(s, &evp->prefix.macip_addr.ip.ip.addr,
                                   ipa_len);
                /* 1st label is the L2 VNI */
                stream_put(s, label, BGP_LABEL_BYTES);
                /* Include 2nd label (L3 VNI) if advertising MAC+IP */
                if (ipa_len && num_labels > 1)
                        stream_put(s, label + 1, BGP_LABEL_BYTES);
                break;

        case BGP_EVPN_IMET_ROUTE:
                stream_putc(s, 17); // TODO: length - assumes IPv4 address
                stream_put(s, prd->val, 8);      /* RD */
                stream_putl(s, evp->prefix.imet_addr.eth_tag); /* Ethernet Tag ID */
                stream_putc(s, IPV4_MAX_BITLEN); /* IP address Length - bits */
                /* Originating Router's IP Addr */
                stream_put_in_addr(s, &evp->prefix.imet_addr.ip.ipaddr_v4);
                break;

        case BGP_EVPN_ES_ROUTE:
                stream_putc(s, 23); /* TODO: length: assumes ipv4 VTEP */
                stream_put(s, prd->val, 8); /* RD */
                stream_put(s, evp->prefix.es_addr.esi.val, 10); /* ESI */
                stream_putc(s, IPV4_MAX_BITLEN); /* IP address Length - bits */
                /* VTEP IP */
                stream_put_in_addr(s, &evp->prefix.es_addr.ip.ipaddr_v4);
                break;

        case BGP_EVPN_IP_PREFIX_ROUTE:
                /* TODO: AddPath support. */
                evpn_mpattr_encode_type5(s, p, prd, label, num_labels, attr);
                break;

        default:
                break;
        }
}

int bgp_nlri_parse_evpn(struct peer *peer, struct attr *attr,
                        struct bgp_nlri *packet, int withdraw)
{
        uint8_t *pnt;
        uint8_t *lim;
        afi_t afi;
        safi_t safi;
        uint32_t addpath_id;
        int addpath_encoded;
        int psize = 0;
        uint8_t rtype;
        struct prefix p;

        /* Start processing the NLRI - there may be multiple in the MP_REACH */
        pnt = packet->nlri;
        lim = pnt + packet->length;
        afi = packet->afi;
        safi = packet->safi;
        addpath_id = 0;

        addpath_encoded =
                (CHECK_FLAG(peer->af_cap[afi][safi], PEER_CAP_ADDPATH_AF_RX_ADV)
                 && CHECK_FLAG(peer->af_cap[afi][safi],
                               PEER_CAP_ADDPATH_AF_TX_RCV));

        for (; pnt < lim; pnt += psize) {
                /* Clear prefix structure. */
                memset(&p, 0, sizeof(struct prefix));

                /* Deal with path-id if AddPath is supported. */
                if (addpath_encoded) {
                        /* When packet overflow occurs return immediately. */
                        if (pnt + BGP_ADDPATH_ID_LEN > lim)
                                return BGP_NLRI_PARSE_ERROR_PACKET_OVERFLOW;

                        memcpy(&addpath_id, pnt, BGP_ADDPATH_ID_LEN);
                        addpath_id = ntohl(addpath_id);
                        pnt += BGP_ADDPATH_ID_LEN;
                }

                /* All EVPN NLRI types start with type and length. */
                if (pnt + 2 > lim)
                        return BGP_NLRI_PARSE_ERROR_EVPN_MISSING_TYPE;

                rtype = *pnt++;
                psize = *pnt++;

                /* When packet overflow occur return immediately. */
                if (pnt + psize > lim)
                        return BGP_NLRI_PARSE_ERROR_PACKET_OVERFLOW;

                switch (rtype) {
                case BGP_EVPN_MAC_IP_ROUTE:
                        if (process_type2_route(peer, afi, safi,
                                                withdraw ? NULL : attr, pnt,
                                                psize, addpath_id)) {
                                flog_err(
                                        EC_BGP_EVPN_FAIL,
                                        "%u:%s - Error in processing EVPN type-2 NLRI size %d",
                                        peer->bgp->vrf_id, peer->host, psize);
                                return BGP_NLRI_PARSE_ERROR_EVPN_TYPE2_SIZE;
                        }
                        break;

                case BGP_EVPN_IMET_ROUTE:
                        if (process_type3_route(peer, afi, safi,
                                                withdraw ? NULL : attr, pnt,
                                                psize, addpath_id)) {
                                flog_err(
                                        EC_BGP_PKT_PROCESS,
                                        "%u:%s - Error in processing EVPN type-3 NLRI size %d",
                                        peer->bgp->vrf_id, peer->host, psize);
                                return BGP_NLRI_PARSE_ERROR_EVPN_TYPE3_SIZE;
                        }
                        break;

                case BGP_EVPN_ES_ROUTE:
                        if (process_type4_route(peer, afi, safi,
                                                withdraw ? NULL : attr, pnt,
                                                psize, addpath_id)) {
                                flog_err(
                                        EC_BGP_PKT_PROCESS,
                                        "%u:%s - Error in processing EVPN type-4 NLRI size %d",
                                        peer->bgp->vrf_id, peer->host, psize);
                                return BGP_NLRI_PARSE_ERROR_EVPN_TYPE4_SIZE;
                        }
                        break;

                case BGP_EVPN_IP_PREFIX_ROUTE:
                        if (process_type5_route(peer, afi, safi,
                                                withdraw ? NULL : attr, pnt,
                                                psize, addpath_id)) {
                                flog_err(
                                        EC_BGP_PKT_PROCESS,
                                        "%u:%s - Error in processing EVPN type-5 NLRI size %d",
                                        peer->bgp->vrf_id, peer->host, psize);
                                return BGP_NLRI_PARSE_ERROR_EVPN_TYPE5_SIZE;
                        }
                        break;

                default:
                        break;
                }
        }

        /* Packet length consistency check. */
        if (pnt != lim)
                return BGP_NLRI_PARSE_ERROR_PACKET_LENGTH;

        return BGP_NLRI_PARSE_OK;
}

/*
 * Map the RTs (configured or automatically derived) of a VRF to the VRF.
 * The mapping will be used during route processing.
 * bgp_def: default bgp instance
 * bgp_vrf: specific bgp vrf instance on which RT is configured
 */
void bgp_evpn_map_vrf_to_its_rts(struct bgp *bgp_vrf)
{
        int i = 0;
        struct ecommunity_val *eval = NULL;
        struct listnode *node = NULL, *nnode = NULL;
        struct ecommunity *ecom = NULL;

        for (ALL_LIST_ELEMENTS(bgp_vrf->vrf_import_rtl, node, nnode, ecom)) {
                for (i = 0; i < ecom->size; i++) {
                        eval = (struct ecommunity_val *)(ecom->val
                                                         + (i
                                                            * ECOMMUNITY_SIZE));
                        map_vrf_to_rt(bgp_vrf, eval);
                }
        }
}

/*
 * Unmap the RTs (configured or automatically derived) of a VRF from the VRF.
 */
void bgp_evpn_unmap_vrf_from_its_rts(struct bgp *bgp_vrf)
{
        int i;
        struct ecommunity_val *eval;
        struct listnode *node, *nnode;
        struct ecommunity *ecom;

        for (ALL_LIST_ELEMENTS(bgp_vrf->vrf_import_rtl, node, nnode, ecom)) {
                for (i = 0; i < ecom->size; i++) {
                        struct vrf_irt_node *irt;
                        struct ecommunity_val eval_tmp;

                        eval = (struct ecommunity_val *)(ecom->val
                                                         + (i
                                                            * ECOMMUNITY_SIZE));
                        /* If using "automatic" RT, we only care about the
                         * local-admin sub-field.
                         * This is to facilitate using VNI as the RT for EBGP
                         * peering too.
                         */
                        memcpy(&eval_tmp, eval, ECOMMUNITY_SIZE);
                        if (!CHECK_FLAG(bgp_vrf->vrf_flags,
                                        BGP_VRF_IMPORT_RT_CFGD))
                                mask_ecom_global_admin(&eval_tmp, eval);

                        irt = lookup_vrf_import_rt(&eval_tmp);
                        if (irt)
                                unmap_vrf_from_rt(bgp_vrf, irt);
                }
        }
}


/*
 * Map the RTs (configured or automatically derived) of a VNI to the VNI.
 * The mapping will be used during route processing.
 */
void bgp_evpn_map_vni_to_its_rts(struct bgp *bgp, struct bgpevpn *vpn)
{
        int i;
        struct ecommunity_val *eval;
        struct listnode *node, *nnode;
        struct ecommunity *ecom;

        for (ALL_LIST_ELEMENTS(vpn->import_rtl, node, nnode, ecom)) {
                for (i = 0; i < ecom->size; i++) {
                        eval = (struct ecommunity_val *)(ecom->val
                                                         + (i
                                                            * ECOMMUNITY_SIZE));
                        map_vni_to_rt(bgp, vpn, eval);
                }
        }
}

/*
 * Unmap the RTs (configured or automatically derived) of a VNI from the VNI.
 */
void bgp_evpn_unmap_vni_from_its_rts(struct bgp *bgp, struct bgpevpn *vpn)
{
        int i;
        struct ecommunity_val *eval;
        struct listnode *node, *nnode;
        struct ecommunity *ecom;

        for (ALL_LIST_ELEMENTS(vpn->import_rtl, node, nnode, ecom)) {
                for (i = 0; i < ecom->size; i++) {
                        struct irt_node *irt;
                        struct ecommunity_val eval_tmp;

                        eval = (struct ecommunity_val *)(ecom->val
                                                         + (i
                                                            * ECOMMUNITY_SIZE));
                        /* If using "automatic" RT, we only care about the
                         * local-admin sub-field.
                         * This is to facilitate using VNI as the RT for EBGP
                         * peering too.
                         */
                        memcpy(&eval_tmp, eval, ECOMMUNITY_SIZE);
                        if (!is_import_rt_configured(vpn))
                                mask_ecom_global_admin(&eval_tmp, eval);

                        irt = lookup_import_rt(bgp, &eval_tmp);
                        if (irt)
                                unmap_vni_from_rt(bgp, vpn, irt);
                }
        }
}

/*
 * Derive Import RT automatically for VNI and map VNI to RT.
 * The mapping will be used during route processing.
 */
void bgp_evpn_derive_auto_rt_import(struct bgp *bgp, struct bgpevpn *vpn)
{
        form_auto_rt(bgp, vpn->vni, vpn->import_rtl);
        UNSET_FLAG(vpn->flags, VNI_FLAG_IMPRT_CFGD);

        /* Map RT to VNI */
        bgp_evpn_map_vni_to_its_rts(bgp, vpn);
}

/*
 * Derive Export RT automatically for VNI.
 */
void bgp_evpn_derive_auto_rt_export(struct bgp *bgp, struct bgpevpn *vpn)
{
        form_auto_rt(bgp, vpn->vni, vpn->export_rtl);
        UNSET_FLAG(vpn->flags, VNI_FLAG_EXPRT_CFGD);
}

/*
 * Derive RD automatically for VNI using passed information - it
 * is of the form RouterId:unique-id-for-vni.
 */
void bgp_evpn_derive_auto_rd_for_vrf(struct bgp *bgp)
{
        if (is_vrf_rd_configured(bgp))
                return;

        form_auto_rd(bgp->router_id, bgp->vrf_rd_id, &bgp->vrf_prd);
}

/*
 * Derive RD automatically for VNI using passed information - it
 * is of the form RouterId:unique-id-for-vni.
 */
void bgp_evpn_derive_auto_rd(struct bgp *bgp, struct bgpevpn *vpn)
{
        char buf[100];

        vpn->prd.family = AF_UNSPEC;
        vpn->prd.prefixlen = 64;
        sprintf(buf, "%s:%hu", inet_ntoa(bgp->router_id), vpn->rd_id);
        (void)str2prefix_rd(buf, &vpn->prd);
        UNSET_FLAG(vpn->flags, VNI_FLAG_RD_CFGD);
}

/*
 * Lookup L3-VNI
 */
bool bgp_evpn_lookup_l3vni_l2vni_table(vni_t vni)
{
        struct list *inst = bm->bgp;
        struct listnode *node;
        struct bgp *bgp_vrf;

        for (ALL_LIST_ELEMENTS_RO(inst, node, bgp_vrf)) {
                if (bgp_vrf->l3vni == vni)
                        return true;
        }

        return false;
}

/*
 * Lookup VNI.
 */
struct bgpevpn *bgp_evpn_lookup_vni(struct bgp *bgp, vni_t vni)
{
        struct bgpevpn *vpn;
        struct bgpevpn tmp;

        memset(&tmp, 0, sizeof(struct bgpevpn));
        tmp.vni = vni;
        vpn = hash_lookup(bgp->vnihash, &tmp);
        return vpn;
}

/*
 * Create a new vpn - invoked upon configuration or zebra notification.
 */
struct bgpevpn *bgp_evpn_new(struct bgp *bgp, vni_t vni,
                struct in_addr originator_ip,
                vrf_id_t tenant_vrf_id,
                struct in_addr mcast_grp)
{
        struct bgpevpn *vpn;

        if (!bgp)
                return NULL;

        vpn = XCALLOC(MTYPE_BGP_EVPN, sizeof(struct bgpevpn));

        /* Set values - RD and RT set to defaults. */
        vpn->vni = vni;
        vpn->originator_ip = originator_ip;
        vpn->tenant_vrf_id = tenant_vrf_id;
        vpn->mcast_grp = mcast_grp;

        /* Initialize route-target import and export lists */
        vpn->import_rtl = list_new();
        vpn->import_rtl->cmp = (int (*)(void *, void *))evpn_route_target_cmp;
        vpn->import_rtl->del = evpn_xxport_delete_ecomm;
        vpn->export_rtl = list_new();
        vpn->export_rtl->cmp = (int (*)(void *, void *))evpn_route_target_cmp;
        vpn->export_rtl->del = evpn_xxport_delete_ecomm;
        bf_assign_index(bm->rd_idspace, vpn->rd_id);
        derive_rd_rt_for_vni(bgp, vpn);

        /* Initialize EVPN route table. */
        vpn->route_table = bgp_table_init(bgp, AFI_L2VPN, SAFI_EVPN);

        /* Add to hash */
        if (!hash_get(bgp->vnihash, vpn, hash_alloc_intern)) {
                XFREE(MTYPE_BGP_EVPN, vpn);
                return NULL;
        }

        /* add to l2vni list on corresponding vrf */
        bgpevpn_link_to_l3vni(vpn);

        QOBJ_REG(vpn, bgpevpn);
        return vpn;
}

/*
 * Free a given VPN - called in multiple scenarios such as zebra
 * notification, configuration being deleted, advertise-all-vni disabled etc.
 * This just frees appropriate memory, caller should have taken other
 * needed actions.
 */
void bgp_evpn_free(struct bgp *bgp, struct bgpevpn *vpn)
{
        bgpevpn_unlink_from_l3vni(vpn);
        bgp_table_unlock(vpn->route_table);
        bgp_evpn_unmap_vni_from_its_rts(bgp, vpn);
        list_delete(&vpn->import_rtl);
        list_delete(&vpn->export_rtl);
        bf_release_index(bm->rd_idspace, vpn->rd_id);
        hash_release(bgp->vnihash, vpn);
        QOBJ_UNREG(vpn);
        XFREE(MTYPE_BGP_EVPN, vpn);
}

/*
 * Lookup local ES.
 */
struct evpnes *bgp_evpn_lookup_es(struct bgp *bgp, esi_t *esi)
{
        struct evpnes *es;
        struct evpnes tmp;

        memset(&tmp, 0, sizeof(struct evpnes));
        memcpy(&tmp.esi, esi, sizeof(esi_t));
        es = hash_lookup(bgp->esihash, &tmp);
        return es;
}

/*
 * Create a new local es - invoked upon zebra notification.
 */
struct evpnes *bgp_evpn_es_new(struct bgp *bgp,
                               esi_t *esi,
                               struct ipaddr *originator_ip)
{
        char buf[100];
        struct evpnes *es;

        if (!bgp)
                return NULL;

        es = XCALLOC(MTYPE_BGP_EVPN_ES, sizeof(struct evpnes));

        /* set the ESI and originator_ip */
        memcpy(&es->esi, esi, sizeof(esi_t));
        memcpy(&es->originator_ip, originator_ip, sizeof(struct ipaddr));

        /* Initialise the VTEP list */
        es->vtep_list = list_new();
        es->vtep_list->cmp = evpn_vtep_ip_cmp;

        /* auto derive RD for this es */
        bf_assign_index(bm->rd_idspace, es->rd_id);
        es->prd.family = AF_UNSPEC;
        es->prd.prefixlen = 64;
        sprintf(buf, "%s:%hu", inet_ntoa(bgp->router_id), es->rd_id);
        (void)str2prefix_rd(buf, &es->prd);

        /* Initialize the ES route table */
        es->route_table = bgp_table_init(bgp, AFI_L2VPN, SAFI_EVPN);

        /* Add to hash */
        if (!hash_get(bgp->esihash, es, hash_alloc_intern)) {
                XFREE(MTYPE_BGP_EVPN_ES, es);
                return NULL;
        }

        QOBJ_REG(es, evpnes);
        return es;
}

/*
 * Free a given ES -
 * This just frees appropriate memory, caller should have taken other
 * needed actions.
 */
void bgp_evpn_es_free(struct bgp *bgp, struct evpnes *es)
{
        list_delete(&es->vtep_list);
        bgp_table_unlock(es->route_table);
        bf_release_index(bm->rd_idspace, es->rd_id);
        hash_release(bgp->esihash, es);
        QOBJ_UNREG(es);
        XFREE(MTYPE_BGP_EVPN_ES, es);
}

/*
 * Import evpn route from global table to VNI/VRF/ESI.
 */
int bgp_evpn_import_route(struct bgp *bgp, afi_t afi, safi_t safi,
                          const struct prefix *p, struct bgp_path_info *pi)
{
        return install_uninstall_evpn_route(bgp, afi, safi, p, pi, 1);
}

/*
 * Unimport evpn route from VNI/VRF/ESI.
 */
int bgp_evpn_unimport_route(struct bgp *bgp, afi_t afi, safi_t safi,
                            const struct prefix *p, struct bgp_path_info *pi)
{
        return install_uninstall_evpn_route(bgp, afi, safi, p, pi, 0);
}

/* filter routes which have martian next hops */
int bgp_filter_evpn_routes_upon_martian_nh_change(struct bgp *bgp)
{
        afi_t afi;
        safi_t safi;
        struct bgp_node *rd_rn, *rn;
        struct bgp_table *table;
        struct bgp_path_info *pi;

        afi = AFI_L2VPN;
        safi = SAFI_EVPN;

        /* Walk entire global routing table and evaluate routes which could be
         * imported into this VPN. Note that we cannot just look at the routes
         * for the VNI's RD -
         * remote routes applicable for this VNI could have any RD.
         */
        /* EVPN routes are a 2-level table. */
        for (rd_rn = bgp_table_top(bgp->rib[afi][safi]); rd_rn;
             rd_rn = bgp_route_next(rd_rn)) {
                table = bgp_node_get_bgp_table_info(rd_rn);
                if (!table)
                        continue;

                for (rn = bgp_table_top(table); rn; rn = bgp_route_next(rn)) {

                        for (pi = bgp_node_get_bgp_path_info(rn); pi;
                             pi = pi->next) {

                                /* Consider "valid" remote routes applicable for
                                 * this VNI. */
                                if (!(pi->type == ZEBRA_ROUTE_BGP
                                      && pi->sub_type == BGP_ROUTE_NORMAL))
                                        continue;
                                if (bgp_nexthop_self(bgp, afi,
                                                pi->type, pi->sub_type,
                                                pi->attr, rn)) {
                                        const struct prefix *p =
                                                bgp_node_get_prefix(rn);

                                        if (bgp_debug_update(pi->peer, p, NULL,
                                                             1)) {
                                                char attr_str[BUFSIZ] = {0};

                                                bgp_dump_attr(pi->attr,
                                                              attr_str, BUFSIZ);

                                                zlog_debug(
                                                        "%u: prefix %pRN with attr %s - DENIED due to martian or self nexthop",
                                                        bgp->vrf_id, rn,
                                                        attr_str);
                                        }
                                        bgp_evpn_unimport_route(bgp, afi, safi,
                                                                p, pi);

                                        bgp_rib_remove(rn, pi, pi->peer, afi,
                                                       safi);
                                }
                        }
                }
        }

        return 0;
}

/*
 * Handle del of a local MACIP.
 */
int bgp_evpn_local_macip_del(struct bgp *bgp, vni_t vni, struct ethaddr *mac,
                             struct ipaddr *ip, int state)
{
        struct bgpevpn *vpn;
        struct prefix_evpn p;
        struct bgp_node *rn;

        /* Lookup VNI hash - should exist. */
        vpn = bgp_evpn_lookup_vni(bgp, vni);
        if (!vpn || !is_vni_live(vpn)) {
                flog_warn(EC_BGP_EVPN_VPN_VNI,
                          "%u: VNI hash entry for VNI %u %s at MACIP DEL",
                          bgp->vrf_id, vni, vpn ? "not live" : "not found");
                return -1;
        }

        build_evpn_type2_prefix(&p, mac, ip);
        if (state == ZEBRA_NEIGH_ACTIVE) {
                /* Remove EVPN type-2 route and schedule for processing. */
                delete_evpn_route(bgp, vpn, &p);
        } else {
                /* Re-instate the current remote best path if any */
                rn = bgp_node_lookup(vpn->route_table, (struct prefix *)&p);
                if (rn)
                        evpn_zebra_reinstall_best_route(bgp, vpn, rn);
        }

        return 0;
}

/*
 * Handle add of a local MACIP.
 */
int bgp_evpn_local_macip_add(struct bgp *bgp, vni_t vni, struct ethaddr *mac,
                             struct ipaddr *ip, uint8_t flags, uint32_t seq)
{
        struct bgpevpn *vpn;
        struct prefix_evpn p;

        /* Lookup VNI hash - should exist. */
        vpn = bgp_evpn_lookup_vni(bgp, vni);
        if (!vpn || !is_vni_live(vpn)) {
                flog_warn(EC_BGP_EVPN_VPN_VNI,
                          "%u: VNI hash entry for VNI %u %s at MACIP ADD",
                          bgp->vrf_id, vni, vpn ? "not live" : "not found");
                return -1;
        }

        /* Create EVPN type-2 route and schedule for processing. */
        build_evpn_type2_prefix(&p, mac, ip);
        if (update_evpn_route(bgp, vpn, &p, flags, seq)) {
                char buf[ETHER_ADDR_STRLEN];
                char buf2[INET6_ADDRSTRLEN];

                flog_err(
                        EC_BGP_EVPN_ROUTE_CREATE,
                        "%u:Failed to create Type-2 route, VNI %u %s MAC %s IP %s (flags: 0x%x)",
                        bgp->vrf_id, vpn->vni,
                        CHECK_FLAG(flags, ZEBRA_MACIP_TYPE_STICKY)
                                ? "sticky gateway"
                                : "",
                        prefix_mac2str(mac, buf, sizeof(buf)),
                        ipaddr2str(ip, buf2, sizeof(buf2)), flags);
                return -1;
        }

        return 0;
}

static void link_l2vni_hash_to_l3vni(struct hash_bucket *bucket,
                                     struct bgp *bgp_vrf)
{
        struct bgpevpn *vpn = (struct bgpevpn *)bucket->data;
        struct bgp *bgp_evpn = NULL;

        bgp_evpn = bgp_get_evpn();
        assert(bgp_evpn);

        if (vpn->tenant_vrf_id == bgp_vrf->vrf_id)
                bgpevpn_link_to_l3vni(vpn);
}

int bgp_evpn_local_l3vni_add(vni_t l3vni, vrf_id_t vrf_id,
                             struct ethaddr *svi_rmac,
                             struct ethaddr *vrr_rmac,
                             struct in_addr originator_ip, int filter,
                             ifindex_t svi_ifindex,
                             bool is_anycast_mac)
{
        struct bgp *bgp_vrf = NULL; /* bgp VRF instance */
        struct bgp *bgp_evpn = NULL; /* EVPN bgp instance */
        struct listnode *node = NULL;
        struct bgpevpn *vpn = NULL;
        as_t as = 0;

        /* get the EVPN instance - required to get the AS number for VRF
         * auto-creatio
         */
        bgp_evpn = bgp_get_evpn();
        if (!bgp_evpn) {
                flog_err(
                        EC_BGP_NO_DFLT,
                        "Cannot process L3VNI  %u ADD - EVPN BGP instance not yet created",
                        l3vni);
                return -1;
        }
        as = bgp_evpn->as;

        /* if the BGP vrf instance doesn't exist - create one */
        bgp_vrf = bgp_lookup_by_vrf_id(vrf_id);
        if (!bgp_vrf) {

                int ret = 0;

                ret = bgp_get_vty(&bgp_vrf, &as, vrf_id_to_name(vrf_id),
                                  vrf_id == VRF_DEFAULT
                                  ? BGP_INSTANCE_TYPE_DEFAULT
                                  : BGP_INSTANCE_TYPE_VRF);
                switch (ret) {
                case BGP_ERR_AS_MISMATCH:
                        flog_err(EC_BGP_EVPN_AS_MISMATCH,
                                 "BGP is already running; AS is %u\n", as);
                        return -1;
                case BGP_ERR_INSTANCE_MISMATCH:
                        flog_err(EC_BGP_EVPN_INSTANCE_MISMATCH,
                                 "BGP instance name and AS number mismatch\n");
                        return -1;
                }

                /* mark as auto created */
                SET_FLAG(bgp_vrf->vrf_flags, BGP_VRF_AUTO);
        }

        /* associate the vrf with l3vni and related parameters */
        bgp_vrf->l3vni = l3vni;
        bgp_vrf->originator_ip = originator_ip;
        bgp_vrf->l3vni_svi_ifindex = svi_ifindex;
        bgp_vrf->evpn_info->is_anycast_mac = is_anycast_mac;

        /* copy anycast MAC from VRR MAC */
        memcpy(&bgp_vrf->rmac, vrr_rmac, ETH_ALEN);
        /* copy sys RMAC from SVI MAC */
        memcpy(&bgp_vrf->evpn_info->pip_rmac_zebra, svi_rmac, ETH_ALEN);
        /* PIP user configured mac is not present use svi mac as sys mac */
        if (is_zero_mac(&bgp_vrf->evpn_info->pip_rmac_static))
                memcpy(&bgp_vrf->evpn_info->pip_rmac, svi_rmac, ETH_ALEN);

        if (bgp_debug_zebra(NULL)) {
                char buf[ETHER_ADDR_STRLEN];
                char buf1[ETHER_ADDR_STRLEN];
                char buf2[ETHER_ADDR_STRLEN];

                zlog_debug("VRF %s vni %u pip %s RMAC %s sys RMAC %s static RMAC %s is_anycast_mac %s",
                           vrf_id_to_name(bgp_vrf->vrf_id),
                           bgp_vrf->l3vni,
                           bgp_vrf->evpn_info->advertise_pip ? "enable"
                           : "disable",
                           prefix_mac2str(&bgp_vrf->rmac, buf, sizeof(buf)),
                           prefix_mac2str(&bgp_vrf->evpn_info->pip_rmac,
                                          buf1, sizeof(buf1)),
                           prefix_mac2str(&bgp_vrf->evpn_info->pip_rmac_static,
                                          buf2, sizeof(buf2)),
                           is_anycast_mac ? "Enable" : "Disable");
        }
        /* set the right filter - are we using l3vni only for prefix routes? */
        if (filter)
                SET_FLAG(bgp_vrf->vrf_flags, BGP_VRF_L3VNI_PREFIX_ROUTES_ONLY);

        /* Map auto derive or configured RTs */
        if (!CHECK_FLAG(bgp_vrf->vrf_flags, BGP_VRF_IMPORT_RT_CFGD))
                evpn_auto_rt_import_add_for_vrf(bgp_vrf);
        else
                bgp_evpn_map_vrf_to_its_rts(bgp_vrf);

        if (!CHECK_FLAG(bgp_vrf->vrf_flags, BGP_VRF_EXPORT_RT_CFGD))
                evpn_auto_rt_export_add_for_vrf(bgp_vrf);

        /* auto derive RD */
        bgp_evpn_derive_auto_rd_for_vrf(bgp_vrf);

        /* link all corresponding l2vnis */
        hash_iterate(bgp_evpn->vnihash,
                     (void (*)(struct hash_bucket *,
                               void *))link_l2vni_hash_to_l3vni,
                     bgp_vrf);

        /* Only update all corresponding type-2 routes if we are advertising two
         * labels along with type-2 routes
         */
        if (!filter)
                for (ALL_LIST_ELEMENTS_RO(bgp_vrf->l2vnis, node, vpn))
                        update_routes_for_vni(bgp_evpn, vpn);

        /* advertise type-5 routes if needed */
        update_advertise_vrf_routes(bgp_vrf);

        /* install all remote routes belonging to this l3vni into correspondng
         * vrf */
        install_routes_for_vrf(bgp_vrf);

        return 0;
}

int bgp_evpn_local_l3vni_del(vni_t l3vni, vrf_id_t vrf_id)
{
        struct bgp *bgp_vrf = NULL; /* bgp vrf instance */
        struct bgp *bgp_evpn = NULL; /* EVPN bgp instance */
        struct listnode *node = NULL;
        struct listnode *next = NULL;
        struct bgpevpn *vpn = NULL;

        bgp_vrf = bgp_lookup_by_vrf_id(vrf_id);
        if (!bgp_vrf) {
                flog_err(
                        EC_BGP_NO_DFLT,
                        "Cannot process L3VNI %u Del - Could not find BGP instance",
                        l3vni);
                return -1;
        }

        bgp_evpn = bgp_get_evpn();
        if (!bgp_evpn) {
                flog_err(
                        EC_BGP_NO_DFLT,
                        "Cannot process L3VNI %u Del - Could not find EVPN BGP instance",
                        l3vni);
                return -1;
        }

        /* Remove remote routes from BGT VRF even if BGP_VRF_AUTO is configured,
         * bgp_delete would not remove/decrement bgp_path_info of the ip_prefix
         * routes. This will uninstalling the routes from zebra and decremnt the
         * bgp info count.
         */
        uninstall_routes_for_vrf(bgp_vrf);

        /* delete/withdraw all type-5 routes */
        delete_withdraw_vrf_routes(bgp_vrf);

        /* remove the l3vni from vrf instance */
        bgp_vrf->l3vni = 0;

        /* remove the Rmac from the BGP vrf */
        memset(&bgp_vrf->rmac, 0, sizeof(struct ethaddr));
        memset(&bgp_vrf->evpn_info->pip_rmac_zebra, 0, ETH_ALEN);
        if (is_zero_mac(&bgp_vrf->evpn_info->pip_rmac_static) &&
            !is_zero_mac(&bgp_vrf->evpn_info->pip_rmac))
                memset(&bgp_vrf->evpn_info->pip_rmac, 0, ETH_ALEN);

        /* remove default import RT or Unmap non-default import RT */
        if (!list_isempty(bgp_vrf->vrf_import_rtl)) {
                bgp_evpn_unmap_vrf_from_its_rts(bgp_vrf);
                if (!CHECK_FLAG(bgp_vrf->vrf_flags, BGP_VRF_IMPORT_RT_CFGD))
                        list_delete_all_node(bgp_vrf->vrf_import_rtl);
        }

        /* remove default export RT */
        if (!list_isempty(bgp_vrf->vrf_export_rtl) &&
            !CHECK_FLAG(bgp_vrf->vrf_flags, BGP_VRF_EXPORT_RT_CFGD)) {
                list_delete_all_node(bgp_vrf->vrf_export_rtl);
        }

        /* update all corresponding local mac-ip routes */
        if (!CHECK_FLAG(bgp_vrf->vrf_flags, BGP_VRF_L3VNI_PREFIX_ROUTES_ONLY)) {
                for (ALL_LIST_ELEMENTS_RO(bgp_vrf->l2vnis, node, vpn)) {
                        UNSET_FLAG(vpn->flags, VNI_FLAG_USE_TWO_LABELS);
                        update_routes_for_vni(bgp_evpn, vpn);
                }
        }

        /* If any L2VNIs point to this instance, unlink them. */
        for (ALL_LIST_ELEMENTS(bgp_vrf->l2vnis, node, next, vpn))
                bgpevpn_unlink_from_l3vni(vpn);

        UNSET_FLAG(bgp_vrf->vrf_flags, BGP_VRF_L3VNI_PREFIX_ROUTES_ONLY);

        /* Delete the instance if it was autocreated */
        if (CHECK_FLAG(bgp_vrf->vrf_flags, BGP_VRF_AUTO))
                bgp_delete(bgp_vrf);

        return 0;
}

/*
 * Handle del of a local VNI.
 */
int bgp_evpn_local_vni_del(struct bgp *bgp, vni_t vni)
{
        struct bgpevpn *vpn;

        /* Locate VNI hash */
        vpn = bgp_evpn_lookup_vni(bgp, vni);
        if (!vpn) {
                if (bgp_debug_zebra(NULL))
                        flog_warn(
                                EC_BGP_EVPN_VPN_VNI,
                                "%u: VNI hash entry for VNI %u not found at DEL",
                                bgp->vrf_id, vni);
                return 0;
        }

        /* Remove all local EVPN routes and schedule for processing (to
         * withdraw from peers).
         */
        delete_routes_for_vni(bgp, vpn);

        /*
         * tunnel is no longer active, del tunnel ip address from tip_hash
         */
        bgp_tip_del(bgp, &vpn->originator_ip);

        /* Clear "live" flag and see if hash needs to be freed. */
        UNSET_FLAG(vpn->flags, VNI_FLAG_LIVE);
        if (!is_vni_configured(vpn))
                bgp_evpn_free(bgp, vpn);

        return 0;
}

/*
 * Handle add (or update) of a local VNI. The VNI changes we care
 * about are for the local-tunnel-ip and the (tenant) VRF.
 */
int bgp_evpn_local_vni_add(struct bgp *bgp, vni_t vni,
                           struct in_addr originator_ip,
                           vrf_id_t tenant_vrf_id,
                           struct in_addr mcast_grp)

{
        struct bgpevpn *vpn;
        struct prefix_evpn p;

        /* Lookup VNI. If present and no change, exit. */
        vpn = bgp_evpn_lookup_vni(bgp, vni);
        if (vpn) {

                if (is_vni_live(vpn)
                    && IPV4_ADDR_SAME(&vpn->originator_ip, &originator_ip)
                    && IPV4_ADDR_SAME(&vpn->mcast_grp, &mcast_grp)
                    && vpn->tenant_vrf_id == tenant_vrf_id)
                        /* Probably some other param has changed that we don't
                         * care about. */
                        return 0;

                bgp_evpn_mcast_grp_change(bgp, vpn, mcast_grp);

                /* Update tenant_vrf_id if it has changed. */
                if (vpn->tenant_vrf_id != tenant_vrf_id) {
                        bgpevpn_unlink_from_l3vni(vpn);
                        vpn->tenant_vrf_id = tenant_vrf_id;
                        bgpevpn_link_to_l3vni(vpn);
                }

                /* If tunnel endpoint IP has changed, update (and delete prior
                 * type-3 route, if needed.)
                 */
                if (!IPV4_ADDR_SAME(&vpn->originator_ip, &originator_ip))
                        handle_tunnel_ip_change(bgp, vpn, originator_ip);

                /* Update all routes with new endpoint IP and/or export RT
                 * for VRFs
                 */
                if (is_vni_live(vpn))
                        update_routes_for_vni(bgp, vpn);
        }

        /* Create or update as appropriate. */
        if (!vpn) {
                vpn = bgp_evpn_new(bgp, vni, originator_ip, tenant_vrf_id,
                                mcast_grp);
                if (!vpn) {
                        flog_err(
                                EC_BGP_VNI,
                                "%u: Failed to allocate VNI entry for VNI %u - at Add",
                                bgp->vrf_id, vni);
                        return -1;
                }
        }

        /* if the VNI is live already, there is nothing more to do */
        if (is_vni_live(vpn))
                return 0;

        /* Mark as "live" */
        SET_FLAG(vpn->flags, VNI_FLAG_LIVE);

        /* tunnel is now active, add tunnel-ip to db */
        bgp_tip_add(bgp, &originator_ip);

        /* filter routes as nexthop database has changed */
        bgp_filter_evpn_routes_upon_martian_nh_change(bgp);

        /*
         * Create EVPN type-3 route and schedule for processing.
         *
         * RT-3 only if doing head-end replication
         */
        if (bgp_evpn_vni_flood_mode_get(bgp, vpn)
                        == VXLAN_FLOOD_HEAD_END_REPL) {
                build_evpn_type3_prefix(&p, vpn->originator_ip);
                if (update_evpn_route(bgp, vpn, &p, 0, 0)) {
                        flog_err(EC_BGP_EVPN_ROUTE_CREATE,
                                 "%u: Type3 route creation failure for VNI %u",
                                 bgp->vrf_id, vni);
                        return -1;
                }
        }

        /* If we have learnt and retained remote routes (VTEPs, MACs) for this
         * VNI,
         * install them.
         */
        install_routes_for_vni(bgp, vpn);

        /* If we are advertising gateway mac-ip
           It needs to be conveyed again to zebra */
        bgp_zebra_advertise_gw_macip(bgp, vpn->advertise_gw_macip, vpn->vni);

        /* advertise svi mac-ip knob to zebra */
        bgp_zebra_advertise_svi_macip(bgp, vpn->advertise_svi_macip, vpn->vni);

        return 0;
}

/*
 * bgp_evpn_local_es_del
 */
int bgp_evpn_local_es_del(struct bgp *bgp,
                          esi_t *esi,
                          struct ipaddr *originator_ip)
{
        char buf[ESI_STR_LEN];
        struct evpnes *es = NULL;

        if (!bgp->esihash) {
                flog_err(EC_BGP_ES_CREATE, "%u: ESI hash not yet created",
                         bgp->vrf_id);
                return -1;
        }

        /* Lookup ESI hash - should exist. */
        es = bgp_evpn_lookup_es(bgp, esi);
        if (!es) {
                flog_warn(EC_BGP_EVPN_ESI,
                          "%u: ESI hash entry for ESI %s at Local ES DEL",
                          bgp->vrf_id, esi_to_str(esi, buf, sizeof(buf)));
                return -1;
        }

        /* Delete all local EVPN ES routes from ESI table
         * and schedule for processing (to withdraw from peers))
         */
        delete_routes_for_es(bgp, es);

        /* free the hash entry */
        bgp_evpn_es_free(bgp, es);

        return 0;
}

/*
 * bgp_evpn_local_es_add
 */
int bgp_evpn_local_es_add(struct bgp *bgp,
                          esi_t *esi,
                          struct ipaddr *originator_ip)
{
        char buf[ESI_STR_LEN];
        struct evpnes *es = NULL;
        struct prefix_evpn p;

        if (!bgp->esihash) {
                flog_err(EC_BGP_ES_CREATE, "%u: ESI hash not yet created",
                         bgp->vrf_id);
                return -1;
        }

        /* create the new es */
        es = bgp_evpn_lookup_es(bgp, esi);
        if (!es) {
                es = bgp_evpn_es_new(bgp, esi, originator_ip);
                if (!es) {
                        flog_err(
                                EC_BGP_ES_CREATE,
                                "%u: Failed to allocate ES entry for ESI %s - at Local ES Add",
                                bgp->vrf_id, esi_to_str(esi, buf, sizeof(buf)));
                        return -1;
                }
        }
        UNSET_FLAG(es->flags, EVPNES_REMOTE);
        SET_FLAG(es->flags, EVPNES_LOCAL);

        build_evpn_type4_prefix(&p, esi, originator_ip->ipaddr_v4);
        if (update_evpn_type4_route(bgp, es, &p)) {
                flog_err(EC_BGP_EVPN_ROUTE_CREATE,
                         "%u: Type4 route creation failure for ESI %s",
                         bgp->vrf_id, esi_to_str(esi, buf, sizeof(buf)));
                return -1;
        }

        /* import all remote ES routes in th ES table */
        install_routes_for_es(bgp, es);

        return 0;
}

/*
 * Handle change in setting for BUM handling. The supported values
 * are head-end replication and dropping all BUM packets. Any change
 * should be registered with zebra. Also, if doing head-end replication,
 * need to advertise local VNIs as EVPN RT-3 wheras, if BUM packets are
 * to be dropped, the RT-3s must be withdrawn.
 */
void bgp_evpn_flood_control_change(struct bgp *bgp)
{
        zlog_info("L2VPN EVPN BUM handling is %s",
                  bgp->vxlan_flood_ctrl == VXLAN_FLOOD_HEAD_END_REPL ?
                  "Flooding" : "Flooding Disabled");

        bgp_zebra_vxlan_flood_control(bgp, bgp->vxlan_flood_ctrl);
        if (bgp->vxlan_flood_ctrl == VXLAN_FLOOD_HEAD_END_REPL)
                hash_iterate(bgp->vnihash, create_advertise_type3, bgp);
        else if (bgp->vxlan_flood_ctrl == VXLAN_FLOOD_DISABLED)
                hash_iterate(bgp->vnihash, delete_withdraw_type3, bgp);
}

/*
 * Cleanup EVPN information on disable - Need to delete and withdraw
 * EVPN routes from peers.
 */
void bgp_evpn_cleanup_on_disable(struct bgp *bgp)
{
        hash_iterate(bgp->vnihash, (void (*)(struct hash_bucket *,
                                             void *))cleanup_vni_on_disable,
                     bgp);
}

/*
 * Cleanup EVPN information - invoked at the time of bgpd exit or when the
 * BGP instance (default) is being freed.
 */
void bgp_evpn_cleanup(struct bgp *bgp)
{
        hash_iterate(bgp->vnihash,
                     (void (*)(struct hash_bucket *, void *))free_vni_entry,
                     bgp);

        hash_free(bgp->import_rt_hash);
        bgp->import_rt_hash = NULL;

        hash_free(bgp->vrf_import_rt_hash);
        bgp->vrf_import_rt_hash = NULL;

        hash_free(bgp->vnihash);
        bgp->vnihash = NULL;
        if (bgp->esihash)
                hash_free(bgp->esihash);
        bgp->esihash = NULL;

        list_delete(&bgp->vrf_import_rtl);
        list_delete(&bgp->vrf_export_rtl);
        list_delete(&bgp->l2vnis);
}

/*
 * Initialization for EVPN
 * Create
 *  VNI hash table
 *  hash for RT to VNI
 */
void bgp_evpn_init(struct bgp *bgp)
{
        bgp->vnihash =
                hash_create(vni_hash_key_make, vni_hash_cmp, "BGP VNI Hash");
        bgp->esihash =
                hash_create(esi_hash_keymake, esi_cmp,
                            "BGP EVPN Local ESI Hash");
        bgp->import_rt_hash =
                hash_create(import_rt_hash_key_make, import_rt_hash_cmp,
                            "BGP Import RT Hash");
        bgp->vrf_import_rt_hash =
                hash_create(vrf_import_rt_hash_key_make, vrf_import_rt_hash_cmp,
                            "BGP VRF Import RT Hash");
        bgp->vrf_import_rtl = list_new();
        bgp->vrf_import_rtl->cmp =
                (int (*)(void *, void *))evpn_route_target_cmp;
        bgp->vrf_import_rtl->del = evpn_xxport_delete_ecomm;
        bgp->vrf_export_rtl = list_new();
        bgp->vrf_export_rtl->cmp =
                (int (*)(void *, void *))evpn_route_target_cmp;
        bgp->vrf_export_rtl->del = evpn_xxport_delete_ecomm;
        bgp->l2vnis = list_new();
        bgp->l2vnis->cmp = vni_list_cmp;
        /* By default Duplicate Address Dection is enabled.
         * Max-moves (N) 5, detection time (M) 180
         * default action is warning-only
         * freeze action permanently freezes address,
         * and freeze time (auto-recovery) is disabled.
         */
        if (bgp->evpn_info) {
                bgp->evpn_info->dup_addr_detect = true;
                bgp->evpn_info->dad_time = EVPN_DAD_DEFAULT_TIME;
                bgp->evpn_info->dad_max_moves = EVPN_DAD_DEFAULT_MAX_MOVES;
                bgp->evpn_info->dad_freeze = false;
                bgp->evpn_info->dad_freeze_time = 0;
                /* Initialize zebra vxlan */
                bgp_zebra_dup_addr_detection(bgp);
                /* Enable PIP feature by default for bgp vrf instance */
                if (bgp->inst_type == BGP_INSTANCE_TYPE_VRF) {
                        struct bgp *bgp_default;

                        bgp->evpn_info->advertise_pip = true;
                        bgp_default = bgp_get_default();
                        if (bgp_default)
                                bgp->evpn_info->pip_ip = bgp_default->router_id;
                }
        }

        /* Default BUM handling is to do head-end replication. */
        bgp->vxlan_flood_ctrl = VXLAN_FLOOD_HEAD_END_REPL;
}

void bgp_evpn_vrf_delete(struct bgp *bgp_vrf)
{
        bgp_evpn_unmap_vrf_from_its_rts(bgp_vrf);
}

/*
 * Get the prefixlen of the ip prefix carried within the type5 evpn route.
 */
int bgp_evpn_get_type5_prefixlen(const struct prefix *pfx)
{
        struct prefix_evpn *evp = (struct prefix_evpn *)pfx;

        if (!pfx || pfx->family != AF_EVPN)
                return 0;

        if (evp->prefix.route_type != BGP_EVPN_IP_PREFIX_ROUTE)
                return 0;

        return evp->prefix.prefix_addr.ip_prefix_length;
}

/*
 * Should we register nexthop for this EVPN prefix for nexthop tracking?
 */
bool bgp_evpn_is_prefix_nht_supported(const struct prefix *pfx)
{
        struct prefix_evpn *evp = (struct prefix_evpn *)pfx;

        /*
         * EVPN RT-5 should not be marked as valid and imported to vrfs if the
         * BGP nexthop is not reachable. To check for the nexthop reachability,
         * Add nexthop for EVPN RT-5 for nexthop tracking.
         *
         * Ideally, a BGP route should be marked as valid only if the
         * nexthop is reachable. Thus, other EVPN route types also should be
         * added here after testing is performed for them.
         */
        if (pfx && pfx->family == AF_EVPN &&
            evp->prefix.route_type == BGP_EVPN_IP_PREFIX_ROUTE)
                return true;

        return false;
}