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mirror_frr/bgpd/bgp_evpn.c
bisdhdh 949b0f24fa bgpd: Implementing a hash table for connected address - ipv4/ipv6 
* IPv6 routes received via a ibgp session with one of its own interface as
nexthop are getting installed in the BGP table.
*A common table to be implemented should take cares of both
ipv4 and ipv6 connected addresses.

Signed-off-by: Biswajit Sadhu sadhub@vmware.com
2019-11-20 01:23:11 +05:30

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/* 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"
/*
* 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);
}
}
/*
* 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);
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,
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",
__PRETTY_FUNCTION__);
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,
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",
__PRETTY_FUNCTION__);
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 ecom_rmac;
struct ecommunity_val eval;
struct ecommunity_val eval_rmac;
bgp_encap_types tnl_type;
struct listnode *node, *nnode;
struct ecommunity *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 */
attr->ecommunity = ecommunity_dup(&ecom_encap);
/* 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)) {
memset(&ecom_rmac, 0, sizeof(ecom_rmac));
encode_rmac_extcomm(&eval_rmac, &attr->rmac);
ecom_rmac.size = 1;
ecom_rmac.val = (uint8_t *)eval_rmac.val;
attr->ecommunity =
ecommunity_merge(attr->ecommunity, &ecom_rmac);
}
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_rmac;
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) {
memset(&ecom_rmac, 0, sizeof(ecom_rmac));
encode_rmac_extcomm(&eval_rmac, &attr->rmac);
ecom_rmac.size = 1;
ecom_rmac.val = (uint8_t *)eval_rmac.val;
attr->ecommunity =
ecommunity_merge(attr->ecommunity, &ecom_rmac);
}
/* 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,
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,
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,
(struct prefix *)&rn->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, 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,
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,
(struct prefix_evpn *)&rn->p,
old_select->attr->nexthop);
}
UNSET_FLAG(old_select->flags, BGP_PATH_MULTIPATH_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);
}
if (new_select && new_select->type == ZEBRA_ROUTE_BGP
&& new_select->sub_type == BGP_ROUTE_IMPORTED) {
ret = evpn_es_install_vtep(bgp, es,
(struct prefix_evpn *)&rn->p,
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 *)&rn->p,
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, (struct prefix_evpn *)&rn->p,
old_select);
UNSET_FLAG(old_select->flags, BGP_PATH_MULTIPATH_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);
}
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 *)&rn->p,
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,
(struct prefix_evpn *)&rn->p,
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;
struct prefix_evpn *evp = NULL;
*ri = NULL;
*route_changed = 1;
evp = (struct prefix_evpn *)&rn->p;
/* 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)
bgp_attr_dup(&attr, src_attr);
else {
memset(&attr, 0, sizeof(struct attr));
bgp_attr_default_set(&attr, BGP_ORIGIN_IGP);
}
/* Set nexthop to ourselves and fill in the Router MAC. */
attr.nexthop = bgp_vrf->originator_ip;
attr.mp_nexthop_global_in = bgp_vrf->originator_ip;
attr.mp_nexthop_len = BGP_ATTR_NHLEN_IPV4;
memcpy(&attr.rmac, &bgp_vrf->rmac, sizeof(struct ethaddr));
/* 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;
struct prefix_evpn *evp;
*pi = NULL;
evp = (struct prefix_evpn *)&rn->p;
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;
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,
(struct prefix_evpn *)&rn->p,
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)
{
char buf[PREFIX_STRLEN];
/* local path was not picked as the winner; kick it out */
if (bgp_debug_zebra(NULL)) {
zlog_debug("evicting local evpn prefix %s as remote won",
prefix2str(&rn->p, buf, sizeof(buf)));
}
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)
bgpevpn_get_rmac(vpn, &attr.rmac);
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; this is just to set the flags correctly
* as local route in the VNI always wins.
*/
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)) {
struct prefix_evpn *evp = (struct prefix_evpn *)&rn->p;
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;
bgpevpn_get_rmac(vpn, &attr.rmac);
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;
}
/* 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);
/* Perform route selection; this is just to set the flags
* correctly as local route in the VNI always wins.
*/
evpn_route_select_install(bgp, vpn, rn);
attr_new = pi->attr;
/* 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)) {
struct prefix_evpn *evp = (struct prefix_evpn *)&rn->p;
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)) {
struct prefix_evpn *evp = (struct prefix_evpn *)&rn->p;
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).
*/
static 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_new;
struct bgp_path_info *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);
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,
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,
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.
*/
bgp_attr_dup(&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);
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();
}
bgp_aggregate_increment(bgp_vrf, &rn->p, 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,
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);
} 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,
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,
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, &rn->p, 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,
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(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)) {
struct prefix_evpn *evp = (struct prefix_evpn *)&rn->p;
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,
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)) {
struct prefix_evpn *evp = (struct prefix_evpn *)&rn->p;
/* 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)) {
struct prefix_evpn *evp = (struct prefix_evpn *)&rn->p;
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,
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
*/
static void update_advertise_vrf_routes(struct bgp *bgp_vrf)
{
/* 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)) {
struct prefix_evpn *evp = (struct prefix_evpn *)&rn->p;
/* 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;
/* 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;
} 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;
}
/* 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
*/
/* 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, 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, struct prefix *p,
struct prefix_rd *prd, mpls_label_t *label,
uint32_t num_labels, struct attr *attr)
{
int len;
char temp[16];
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, 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, &rn->p,
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, 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;
ret = route_map_apply(
bgp_vrf->adv_cmd_rmap[afi][safi]
.map,
&rn->p, RMAP_BGP, pi);
if (ret == RMAP_DENYMATCH)
continue;
}
bgp_evpn_advertise_type5_route(
bgp_vrf, &rn->p, 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);
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)
{
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);
} else {
/* 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(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(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, struct prefix *p,
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;
addpath_id = ntohl(*((uint32_t *)pnt));
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,
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,
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)) {
char attr_str[BUFSIZ] = {0};
char pbuf[PREFIX_STRLEN];
bgp_dump_attr(pi->attr, attr_str,
BUFSIZ);
if (bgp_debug_update(pi->peer, &rn->p,
NULL, 1))
zlog_debug(
"%u: prefix %s with attr %s - DENIED due to martian or self nexthop",
bgp->vrf_id,
prefix2str(
&rn->p, pbuf,
sizeof(pbuf)),
attr_str);
bgp_evpn_unimport_route(bgp, afi, safi,
&rn->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 *rmac,
struct in_addr originator_ip, int filter,
ifindex_t svi_ifindex)
{
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(&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;
memcpy(&bgp_vrf->rmac, rmac, sizeof(struct ethaddr));
bgp_vrf->originator_ip = originator_ip;
bgp_vrf->l3vni_svi_ifindex = svi_ifindex;
/* 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));
/* 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);
}
/* 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(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(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;
}
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