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mirror_frr/bgpd/bgp_evpn.c
Donatas Abraitis 272c6d5db1
Merge pull request #8647 from sworleys/DVNI-Config-Changes 
bgpd: EVPN D-VNI L3 RT Config Enhancements
2022-10-18 14:17:04 +03:00

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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 "lib/printfrr.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_evpn_mh.h"
#include "bgpd/bgp_ecommunity.h"
#include "bgpd/bgp_encap_types.h"
#include "bgpd/bgp_debug.h"
#include "bgpd/bgp_errors.h"
#include "bgpd/bgp_aspath.h"
#include "bgpd/bgp_zebra.h"
#include "bgpd/bgp_nexthop.h"
#include "bgpd/bgp_addpath.h"
#include "bgpd/bgp_mac.h"
#include "bgpd/bgp_vty.h"
#include "bgpd/bgp_nht.h"
#include "bgpd/bgp_trace.h"
/*
* Definitions and external declarations.
*/
DEFINE_QOBJ_TYPE(bgpevpn);
DEFINE_QOBJ_TYPE(bgp_evpn_es);
DEFINE_MTYPE_STATIC(BGPD, VRF_ROUTE_TARGET, "L3 Route Target");
/*
* Static function declarations
*/
static int delete_all_vni_routes(struct bgp *bgp, struct bgpevpn *vpn);
static void bgp_evpn_remote_ip_hash_init(struct bgpevpn *evpn);
static void bgp_evpn_remote_ip_hash_destroy(struct bgpevpn *evpn);
static void bgp_evpn_remote_ip_hash_add(struct bgpevpn *vpn,
struct bgp_path_info *pi);
static void bgp_evpn_remote_ip_hash_del(struct bgpevpn *vpn,
struct bgp_path_info *pi);
static void bgp_evpn_remote_ip_hash_iterate(struct bgpevpn *vpn,
void (*func)(struct hash_bucket *,
void *),
void *arg);
static void bgp_evpn_link_to_vni_svi_hash(struct bgp *bgp, struct bgpevpn *vpn);
static void bgp_evpn_unlink_from_vni_svi_hash(struct bgp *bgp,
struct bgpevpn *vpn);
static unsigned int vni_svi_hash_key_make(const void *p);
static bool vni_svi_hash_cmp(const void *p1, const void *p2);
static void bgp_evpn_remote_ip_process_nexthops(struct bgpevpn *vpn,
struct ipaddr *addr,
bool resolve);
static void bgp_evpn_remote_ip_hash_link_nexthop(struct hash_bucket *bucket,
void *args);
static void bgp_evpn_remote_ip_hash_unlink_nexthop(struct hash_bucket *bucket,
void *args);
static struct in_addr zero_vtep_ip;
/*
* Private functions.
*/
/*
* 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;
return vpn1->vni == vpn2->vni;
}
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;
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 */
(void)hash_get(bgp_evpn->vrf_import_rt_hash, irt, hash_alloc_intern);
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);
}
static void hash_vrf_import_rt_free(struct vrf_irt_node *irt)
{
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(tmp));
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;
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;
irt = XCALLOC(MTYPE_BGP_EVPN_IMPORT_RT, sizeof(struct irt_node));
irt->rt = *rt;
irt->vnis = list_new();
/* Add to hash */
(void)hash_get(bgp->import_rt_hash, irt, hash_alloc_intern);
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);
}
static void hash_import_rt_free(struct irt_node *irt)
{
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(tmp));
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.
*/
int bgp_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);
}
/*
* Compare L3 Route Targets.
*/
static int evpn_vrf_route_target_cmp(struct vrf_route_target *rt1,
struct vrf_route_target *rt2)
{
return bgp_evpn_route_target_cmp(rt1->ecom, rt2->ecom);
}
void bgp_evpn_xxport_delete_ecomm(void *val)
{
struct ecommunity *ecomm = val;
ecommunity_free(&ecomm);
}
/*
* Delete l3 Route Target.
*/
static void evpn_vrf_rt_del(void *val)
{
struct vrf_route_target *l3rt = val;
ecommunity_free(&l3rt->ecom);
XFREE(MTYPE_VRF_ROUTE_TARGET, l3rt);
}
/*
* Allocate a new l3 Route Target.
*/
static struct vrf_route_target *evpn_vrf_rt_new(struct ecommunity *ecom)
{
struct vrf_route_target *l3rt;
l3rt = XCALLOC(MTYPE_VRF_ROUTE_TARGET, sizeof(struct vrf_route_target));
l3rt->ecom = ecom;
return l3rt;
}
/*
* 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,
const 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;
}
}
/*
* Converts the RT to Ecommunity Value and adjusts masking based
* on flags set for RT.
*/
static void vrf_rt2ecom_val(struct ecommunity_val *to_eval,
const struct vrf_route_target *l3rt, int iter)
{
const struct ecommunity_val *eval;
eval = (const struct ecommunity_val *)(l3rt->ecom->val +
(iter * ECOMMUNITY_SIZE));
/* If using "automatic" or "wildcard *" 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 and simplify
* configurations by allowing any ASN via '*'.
*/
memcpy(to_eval, eval, ECOMMUNITY_SIZE);
if (CHECK_FLAG(l3rt->flags, BGP_VRF_RT_AUTO) ||
CHECK_FLAG(l3rt->flags, BGP_VRF_RT_WILD))
mask_ecom_global_admin(to_eval, eval);
}
/*
* Map one RT to specified VRF.
* bgp_vrf = BGP vrf instance
*/
static void map_vrf_to_rt(struct bgp *bgp_vrf, struct vrf_route_target *l3rt)
{
uint32_t i = 0;
for (i = 0; i < l3rt->ecom->size; i++) {
struct vrf_irt_node *irt = NULL;
struct ecommunity_val eval_tmp;
/* Adjust masking for value */
vrf_rt2ecom_val(&eval_tmp, l3rt, i);
irt = lookup_vrf_import_rt(&eval_tmp);
if (irt && is_vrf_present_in_irt_vrfs(irt->vrfs, bgp_vrf))
return; /* Already mapped. */
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_route_target *l3rt)
{
uint32_t i;
for (i = 0; i < l3rt->ecom->size; i++) {
struct vrf_irt_node *irt;
struct ecommunity_val eval_tmp;
/* Adjust masking for value */
vrf_rt2ecom_val(&eval_tmp, l3rt, i);
irt = lookup_vrf_import_rt(&eval_tmp);
if (!irt)
return; /* Not mapped */
/* 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);
/* Add VNI to the hash list for this RT. */
listnode_add(irt->vnis, vpn);
}
/*
* Unmap specified VNI from specified RT. If there are no other
* VNIs for this RT, then the RT hash is deleted.
*/
static void unmap_vni_from_rt(struct bgp *bgp, struct bgpevpn *vpn,
struct irt_node *irt)
{
/* Delete VNI from hash list for this RT. */
listnode_delete(irt->vnis, vpn);
if (!listnode_head(irt->vnis)) {
import_rt_free(bgp, irt);
}
}
static void bgp_evpn_get_rmac_nexthop(struct bgpevpn *vpn,
const struct prefix_evpn *p,
struct attr *attr, uint8_t flags)
{
struct bgp *bgp_vrf = vpn->bgp_vrf;
memset(&attr->rmac, 0, sizeof(struct ethaddr));
if (!bgp_vrf)
return;
if (p->prefix.route_type != BGP_EVPN_MAC_IP_ROUTE)
return;
/* Copy sys (pip) RMAC and PIP IP as nexthop
* in case of route is self MAC-IP,
* advertise-pip and advertise-svi-ip features
* are enabled.
* Otherwise, for all host MAC-IP route's
* copy anycast RMAC.
*/
if (CHECK_FLAG(flags, BGP_EVPN_MACIP_TYPE_SVI_IP)
&& bgp_vrf->evpn_info->advertise_pip &&
bgp_vrf->evpn_info->is_anycast_mac) {
/* copy sys rmac */
memcpy(&attr->rmac, &bgp_vrf->evpn_info->pip_rmac,
ETH_ALEN);
attr->nexthop = bgp_vrf->evpn_info->pip_ip;
attr->mp_nexthop_global_in =
bgp_vrf->evpn_info->pip_ip;
} else
memcpy(&attr->rmac, &bgp_vrf->rmac, ETH_ALEN);
}
/*
* Create RT extended community automatically from passed information:
* of the form AS:VNI.
* NOTE: We use only the lower 16 bits of the AS. This is sufficient as
* the need is to get a RT value that will be unique across different
* VNIs but the same across routers (in the same AS) for a particular
* VNI.
*/
static void form_auto_rt(struct bgp *bgp, vni_t vni, struct list *rtl,
bool is_l3)
{
struct ecommunity_val eval;
struct ecommunity *ecomadd;
struct ecommunity *ecom;
struct vrf_route_target *l3rt;
struct vrf_route_target *newrt;
bool ecom_found = false;
struct listnode *node;
if (bgp->advertise_autort_rfc8365)
vni |= EVPN_AUTORT_VXLAN;
encode_route_target_as((bgp->as & 0xFFFF), vni, &eval);
ecomadd = ecommunity_new();
ecommunity_add_val(ecomadd, &eval, false, false);
if (is_l3) {
for (ALL_LIST_ELEMENTS_RO(rtl, node, l3rt))
if (ecommunity_cmp(ecomadd, l3rt->ecom)) {
ecom_found = true;
break;
}
} else {
for (ALL_LIST_ELEMENTS_RO(rtl, node, ecom))
if (ecommunity_cmp(ecomadd, ecom)) {
ecom_found = true;
break;
}
}
if (!ecom_found) {
if (is_l3) {
newrt = evpn_vrf_rt_new(ecomadd);
/* Label it as autoderived */
SET_FLAG(newrt->flags, BGP_VRF_RT_AUTO);
listnode_add_sort(rtl, newrt);
} else
listnode_add_sort(rtl, ecomadd);
} else
ecommunity_free(&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;
}
struct bgp_dest *bgp_global_evpn_node_get(struct bgp_table *table, afi_t afi,
safi_t safi,
const struct prefix_evpn *evp,
struct prefix_rd *prd)
{
struct prefix_evpn global_p;
if (evp->prefix.route_type == BGP_EVPN_AD_ROUTE) {
/* prefix in the global table doesn't include the VTEP-IP so
* we need to create a different copy of the prefix
*/
evpn_type1_prefix_global_copy(&global_p, evp);
evp = &global_p;
}
return bgp_afi_node_get(table, afi, safi, (struct prefix *)evp, prd);
}
struct bgp_dest *bgp_global_evpn_node_lookup(struct bgp_table *table, afi_t afi,
safi_t safi,
const struct prefix_evpn *evp,
struct prefix_rd *prd)
{
struct prefix_evpn global_p;
if (evp->prefix.route_type == BGP_EVPN_AD_ROUTE) {
/* prefix in the global table doesn't include the VTEP-IP so
* we need to create a different copy of the prefix
*/
evpn_type1_prefix_global_copy(&global_p, evp);
evp = &global_p;
}
return bgp_afi_node_lookup(table, afi, safi, (struct prefix *)evp, prd);
}
/*
* Add (update) or delete MACIP from zebra.
*/
static int bgp_zebra_send_remote_macip(struct bgp *bgp, struct bgpevpn *vpn,
const struct prefix_evpn *p,
struct in_addr remote_vtep_ip, int add,
uint8_t flags, uint32_t seq, esi_t *esi)
{
struct stream *s;
uint16_t ipa_len;
static struct in_addr zero_remote_vtep_ip;
/* Check socket. */
if (!zclient || zclient->sock < 0)
return 0;
/* Don't try to register if Zebra doesn't know of this instance. */
if (!IS_BGP_INST_KNOWN_TO_ZEBRA(bgp)) {
if (BGP_DEBUG(zebra, ZEBRA))
zlog_debug(
"%s: No zebra instance to talk to, not installing remote macip",
__func__);
return 0;
}
if (!esi)
esi = zero_esi;
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_putw(s, 0);
else {
ipa_len = is_evpn_prefix_ipaddr_v4(p) ? IPV4_MAX_BYTELEN
: IPV6_MAX_BYTELEN;
stream_putw(s, ipa_len);
stream_put(s, &p->prefix.macip_addr.ip.ip.addr, ipa_len);
}
/* If the ESI is valid that becomes the nexthop; tape out the
* VTEP-IP for that case
*/
if (bgp_evpn_is_esi_valid(esi))
stream_put_in_addr(s, &zero_remote_vtep_ip);
else
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_put(s, esi, sizeof(esi_t));
}
stream_putw_at(s, 0, stream_get_endp(s));
if (bgp_debug_zebra(NULL))
zlog_debug(
"Tx %s MACIP, VNI %u MAC %pEA IP %pIA flags 0x%x seq %u remote VTEP %pI4",
add ? "ADD" : "DEL", vpn->vni,
&p->prefix.macip_addr.mac, &p->prefix.macip_addr.ip,
flags, seq, &remote_vtep_ip);
frrtrace(5, frr_bgp, evpn_mac_ip_zsend, add, vpn, p, remote_vtep_ip,
esi);
return zclient_send_message(zclient);
}
/*
* Add (update) or delete remote VTEP from zebra.
*/
static int bgp_zebra_send_remote_vtep(struct bgp *bgp, struct bgpevpn *vpn,
const struct prefix_evpn *p,
int flood_control, int add)
{
struct stream *s;
/* Check socket. */
if (!zclient || zclient->sock < 0)
return 0;
/* Don't try to register if Zebra doesn't know of this instance. */
if (!IS_BGP_INST_KNOWN_TO_ZEBRA(bgp)) {
if (BGP_DEBUG(zebra, ZEBRA))
zlog_debug(
"%s: No zebra instance to talk to, not installing remote vtep",
__func__);
return 0;
}
s = zclient->obuf;
stream_reset(s);
zclient_create_header(
s, add ? ZEBRA_REMOTE_VTEP_ADD : ZEBRA_REMOTE_VTEP_DEL,
bgp->vrf_id);
stream_putl(s, vpn->vni);
if (is_evpn_prefix_ipaddr_v4(p))
stream_put_in_addr(s, &p->prefix.imet_addr.ip.ipaddr_v4);
else if (is_evpn_prefix_ipaddr_v6(p)) {
flog_err(
EC_BGP_VTEP_INVALID,
"Bad remote IP when trying to %s remote VTEP for VNI %u",
add ? "ADD" : "DEL", vpn->vni);
return -1;
}
stream_putl(s, flood_control);
stream_putw_at(s, 0, stream_get_endp(s));
if (bgp_debug_zebra(NULL))
zlog_debug("Tx %s Remote VTEP, VNI %u remote VTEP %pI4",
add ? "ADD" : "DEL", vpn->vni,
&p->prefix.imet_addr.ip.ipaddr_v4);
frrtrace(3, frr_bgp, evpn_bum_vtep_zsend, add, vpn, p);
return zclient_send_message(zclient);
}
/*
* Build extended communities for EVPN prefix route.
*/
static void build_evpn_type5_route_extcomm(struct bgp *bgp_vrf,
struct attr *attr)
{
struct ecommunity ecom_encap;
struct ecommunity_val eval;
struct ecommunity_val eval_rmac;
bgp_encap_types tnl_type;
struct listnode *node, *nnode;
struct vrf_route_target *l3rt;
struct ecommunity *old_ecom;
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.unit_size = ECOMMUNITY_SIZE;
ecom_encap.val = (uint8_t *)eval.val;
/* Add Encap */
if (bgp_attr_get_ecommunity(attr)) {
old_ecom = bgp_attr_get_ecommunity(attr);
ecom = ecommunity_merge(ecommunity_dup(old_ecom), &ecom_encap);
if (!old_ecom->refcnt)
ecommunity_free(&old_ecom);
} else
ecom = ecommunity_dup(&ecom_encap);
bgp_attr_set_ecommunity(attr, ecom);
attr->encap_tunneltype = tnl_type;
/* Add the export RTs for L3VNI/VRF */
vrf_export_rtl = bgp_vrf->vrf_export_rtl;
for (ALL_LIST_ELEMENTS(vrf_export_rtl, node, nnode, l3rt))
bgp_attr_set_ecommunity(
attr, ecommunity_merge(bgp_attr_get_ecommunity(attr),
l3rt->ecom));
/* add the router mac extended community */
if (!is_zero_mac(&attr->rmac)) {
encode_rmac_extcomm(&eval_rmac, &attr->rmac);
ecommunity_add_val(bgp_attr_get_ecommunity(attr), &eval_rmac,
true, true);
}
}
/*
* Build extended communities for EVPN route.
* This function is applicable for type-2 and type-3 routes. The layer-2 RT
* and ENCAP extended communities are applicable for all routes.
* The default gateway extended community and MAC mobility (sticky) extended
* community are added as needed based on passed settings - only for type-2
* routes. Likewise, the layer-3 RT and Router MAC extended communities are
* added, if present, based on passed settings - only for non-link-local
* type-2 routes.
*/
static void build_evpn_route_extcomm(struct bgpevpn *vpn, struct attr *attr,
int add_l3_ecomm)
{
struct ecommunity ecom_encap;
struct ecommunity ecom_sticky;
struct ecommunity ecom_default_gw;
struct ecommunity ecom_na;
struct ecommunity_val eval;
struct ecommunity_val eval_sticky;
struct ecommunity_val eval_default_gw;
struct ecommunity_val eval_rmac;
struct ecommunity_val eval_na;
bool proxy;
bgp_encap_types tnl_type;
struct listnode *node, *nnode;
struct ecommunity *ecom;
struct vrf_route_target *l3rt;
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.unit_size = ECOMMUNITY_SIZE;
ecom_encap.val = (uint8_t *)eval.val;
/* Add Encap */
bgp_attr_set_ecommunity(attr, ecommunity_dup(&ecom_encap));
attr->encap_tunneltype = tnl_type;
/* Add the export RTs for L2VNI */
for (ALL_LIST_ELEMENTS(vpn->export_rtl, node, nnode, ecom))
bgp_attr_set_ecommunity(
attr,
ecommunity_merge(bgp_attr_get_ecommunity(attr), 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,
l3rt))
bgp_attr_set_ecommunity(
attr,
ecommunity_merge(
bgp_attr_get_ecommunity(attr),
l3rt->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.unit_size = ECOMMUNITY_SIZE;
ecom_sticky.val = (uint8_t *)eval_sticky.val;
bgp_attr_set_ecommunity(
attr, ecommunity_merge(bgp_attr_get_ecommunity(attr),
&ecom_sticky));
}
/* Add RMAC, if told to. */
if (add_l3_ecomm) {
encode_rmac_extcomm(&eval_rmac, &attr->rmac);
ecommunity_add_val(bgp_attr_get_ecommunity(attr), &eval_rmac,
true, true);
}
/* Add default gateway, if needed. */
if (attr->default_gw) {
memset(&ecom_default_gw, 0, sizeof(ecom_default_gw));
encode_default_gw_extcomm(&eval_default_gw);
ecom_default_gw.size = 1;
ecom_default_gw.unit_size = ECOMMUNITY_SIZE;
ecom_default_gw.val = (uint8_t *)eval_default_gw.val;
bgp_attr_set_ecommunity(
attr, ecommunity_merge(bgp_attr_get_ecommunity(attr),
&ecom_default_gw));
}
proxy = !!(attr->es_flags & ATTR_ES_PROXY_ADVERT);
if (attr->router_flag || proxy) {
memset(&ecom_na, 0, sizeof(ecom_na));
encode_na_flag_extcomm(&eval_na, attr->router_flag, proxy);
ecom_na.size = 1;
ecom_na.unit_size = ECOMMUNITY_SIZE;
ecom_na.val = (uint8_t *)eval_na.val;
bgp_attr_set_ecommunity(
attr, ecommunity_merge(bgp_attr_get_ecommunity(attr),
&ecom_na));
}
}
/*
* 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;
uint32_t i;
uint8_t *pnt;
int type = 0;
int sub_type = 0;
struct ecommunity *ecomm = bgp_attr_get_ecommunity(attr);
/* Build MM */
encode_mac_mobility_extcomm(0, seq_num, &eval);
/* Find current MM ecommunity */
ecom_val_ptr = NULL;
if (ecomm) {
for (i = 0; i < ecomm->size; i++) {
pnt = ecomm->val + (i * ecomm->unit_size);
type = *pnt++;
sub_type = *pnt++;
if (type == ECOMMUNITY_ENCODE_EVPN
&& sub_type
== ECOMMUNITY_EVPN_SUBTYPE_MACMOBILITY) {
ecom_val_ptr =
(ecomm->val + (i * ecomm->unit_size));
break;
}
}
}
/* Update the existing MM ecommunity */
if (ecom_val_ptr) {
memcpy(ecom_val_ptr, eval.val, sizeof(char) * ecomm->unit_size);
}
/* Add MM to existing */
else {
memset(&ecom_tmp, 0, sizeof(ecom_tmp));
ecom_tmp.size = 1;
ecom_tmp.unit_size = ECOMMUNITY_SIZE;
ecom_tmp.val = (uint8_t *)eval.val;
if (ecomm)
bgp_attr_set_ecommunity(
attr, ecommunity_merge(ecomm, &ecom_tmp));
else
bgp_attr_set_ecommunity(attr,
ecommunity_dup(&ecom_tmp));
}
}
/* Install EVPN route into zebra. */
static int evpn_zebra_install(struct bgp *bgp, struct bgpevpn *vpn,
const struct prefix_evpn *p,
struct bgp_path_info *pi)
{
int ret;
uint8_t flags;
int flood_control;
uint32_t seq;
if (p->prefix.route_type == BGP_EVPN_MAC_IP_ROUTE) {
flags = 0;
if (pi->sub_type == BGP_ROUTE_IMPORTED) {
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);
seq = mac_mobility_seqnum(pi->attr);
/* if local ES notify zebra that this is a sync path */
if (bgp_evpn_attr_is_local_es(pi->attr)) {
SET_FLAG(flags, ZEBRA_MACIP_TYPE_SYNC_PATH);
if (bgp_evpn_attr_is_proxy(pi->attr))
SET_FLAG(flags,
ZEBRA_MACIP_TYPE_PROXY_ADVERT);
}
} else {
if (!bgp_evpn_attr_is_sync(pi->attr))
return 0;
/* if a local path is being turned around and sent
* to zebra it is because it is a sync path on
* a local ES
*/
SET_FLAG(flags, ZEBRA_MACIP_TYPE_SYNC_PATH);
/* supply the highest peer seq number to zebra
* for MM seq syncing
*/
seq = bgp_evpn_attr_get_sync_seq(pi->attr);
/* if any of the paths from the peer have the ROUTER
* flag set install the local entry as a router entry
*/
if (is_evpn_prefix_ipaddr_v6(p) &&
(pi->attr->es_flags &
ATTR_ES_PEER_ROUTER))
SET_FLAG(flags,
ZEBRA_MACIP_TYPE_ROUTER_FLAG);
if (!(pi->attr->es_flags & ATTR_ES_PEER_ACTIVE))
SET_FLAG(flags,
ZEBRA_MACIP_TYPE_PROXY_ADVERT);
}
ret = bgp_zebra_send_remote_macip(
bgp, vpn, p, pi->attr->nexthop, 1, flags,
seq, bgp_evpn_attr_get_esi(pi->attr));
} else if (p->prefix.route_type == BGP_EVPN_AD_ROUTE) {
ret = bgp_evpn_remote_es_evi_add(bgp, vpn, p);
} else {
switch (bgp_attr_get_pmsi_tnl_type(pi->attr)) {
case PMSI_TNLTYPE_INGR_REPL:
flood_control = VXLAN_FLOOD_HEAD_END_REPL;
break;
case PMSI_TNLTYPE_PIM_SM:
flood_control = VXLAN_FLOOD_PIM_SM;
break;
default:
flood_control = VXLAN_FLOOD_DISABLED;
break;
}
ret = bgp_zebra_send_remote_vtep(bgp, vpn, p, flood_control, 1);
}
return ret;
}
/* Uninstall EVPN route from zebra. */
static int evpn_zebra_uninstall(struct bgp *bgp, struct bgpevpn *vpn,
const struct prefix_evpn *p,
struct in_addr remote_vtep_ip)
{
int ret;
if (p->prefix.route_type == BGP_EVPN_MAC_IP_ROUTE)
ret = bgp_zebra_send_remote_macip(bgp, vpn, p, remote_vtep_ip,
0, 0, 0, NULL);
else if (p->prefix.route_type == BGP_EVPN_AD_ROUTE)
ret = bgp_evpn_remote_es_evi_del(bgp, vpn, p);
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_dest *dest,
struct bgp_path_info *old_local,
struct bgp_path_info *new_select)
{
struct bgp_dest *global_dest;
struct bgp_path_info *pi;
afi_t afi = AFI_L2VPN;
safi_t safi = SAFI_EVPN;
if (BGP_DEBUG(evpn_mh, EVPN_MH_RT)) {
char esi_buf[ESI_STR_LEN];
char esi_buf2[ESI_STR_LEN];
struct prefix_evpn *evp =
(struct prefix_evpn *)bgp_dest_get_prefix(dest);
zlog_debug("local path deleted %pFX es %s; new-path-es %s", evp,
esi_to_str(&old_local->attr->esi, esi_buf,
sizeof(esi_buf)),
new_select ? esi_to_str(&new_select->attr->esi,
esi_buf2, sizeof(esi_buf2))
: "");
}
/* 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_dest = bgp_global_evpn_node_lookup(bgp->rib[afi][safi], afi, safi,
(const struct prefix_evpn *)bgp_dest_get_prefix(dest),
&vpn->prd);
if (global_dest) {
/* Delete route entry in the global EVPN table. */
delete_evpn_route_entry(bgp, afi, safi, global_dest, &pi);
/* Schedule for processing - withdraws to peers happen from
* this table.
*/
if (pi)
bgp_process(bgp, global_dest, afi, safi);
bgp_dest_unlock_node(global_dest);
}
/* Delete route entry in the VNI route table, caller to remove. */
bgp_path_info_delete(dest, old_local);
}
/*
* Calculate the best path for an EVPN route. Install/update best path in zebra,
* if appropriate.
* Note: vpn is NULL for local EAD-ES routes.
*/
int evpn_route_select_install(struct bgp *bgp, struct bgpevpn *vpn,
struct bgp_dest *dest)
{
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, dest, &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.
* Remote routes and SYNC route (i.e. local routes with
* SYNCED_FROM_PEER flag) need to updated to zebra on any attr
* change.
*/
if (old_select && old_select == new_select
&& old_select->type == ZEBRA_ROUTE_BGP
&& (old_select->sub_type == BGP_ROUTE_IMPORTED ||
bgp_evpn_attr_is_sync(old_select->attr))
&& !CHECK_FLAG(dest->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(old_select))
ret = evpn_zebra_install(
bgp, vpn,
(const struct prefix_evpn *)bgp_dest_get_prefix(
dest),
old_select);
UNSET_FLAG(old_select->flags, BGP_PATH_MULTIPATH_CHG);
UNSET_FLAG(old_select->flags, BGP_PATH_LINK_BW_CHG);
bgp_zebra_clear_route_change_flags(dest);
return ret;
}
/* If the user did a "clear" this flag will be set */
UNSET_FLAG(dest->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(dest);
if (old_select)
bgp_path_info_unset_flag(dest, old_select, BGP_PATH_SELECTED);
if (new_select) {
bgp_path_info_set_flag(dest, new_select, BGP_PATH_SELECTED);
bgp_path_info_unset_flag(dest, new_select,
BGP_PATH_ATTR_CHANGED);
UNSET_FLAG(new_select->flags, BGP_PATH_MULTIPATH_CHG);
UNSET_FLAG(new_select->flags, BGP_PATH_LINK_BW_CHG);
}
/* a local entry with the SYNC flag also results in a MAC-IP update
* to zebra
*/
if (new_select && new_select->type == ZEBRA_ROUTE_BGP
&& (new_select->sub_type == BGP_ROUTE_IMPORTED ||
bgp_evpn_attr_is_sync(new_select->attr))) {
ret = evpn_zebra_install(
bgp, vpn,
(struct prefix_evpn *)bgp_dest_get_prefix(dest),
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 (new_select->sub_type == BGP_ROUTE_IMPORTED &&
old_select && old_select->peer == bgp->peer_self
&& old_select->type == ZEBRA_ROUTE_BGP
&& old_select->sub_type == BGP_ROUTE_STATIC
&& vpn)
evpn_delete_old_local_route(bgp, vpn, dest,
old_select, new_select);
} else {
if (old_select && old_select->type == ZEBRA_ROUTE_BGP
&& old_select->sub_type == BGP_ROUTE_IMPORTED)
ret = evpn_zebra_uninstall(
bgp, vpn,
(const struct prefix_evpn *)bgp_dest_get_prefix(
dest),
old_select->attr->nexthop);
}
/* Clear any route change flags. */
bgp_zebra_clear_route_change_flags(dest);
/* 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(dest, old_select);
return ret;
}
static struct bgp_path_info *bgp_evpn_route_get_local_path(
struct bgp *bgp, struct bgp_dest *dest)
{
struct bgp_path_info *tmp_pi;
struct bgp_path_info *local_pi = NULL;
for (tmp_pi = bgp_dest_get_bgp_path_info(dest); tmp_pi;
tmp_pi = tmp_pi->next) {
if (bgp_evpn_is_path_local(bgp, tmp_pi)) {
local_pi = tmp_pi;
break;
}
}
return local_pi;
}
static int update_evpn_type5_route_entry(struct bgp *bgp_evpn,
struct bgp *bgp_vrf, afi_t afi,
safi_t safi, struct bgp_dest *dest,
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_dest_get_bgp_path_info(dest); 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, dest);
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(dest, 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(dest, tmp_pi,
BGP_PATH_ATTR_CHANGED);
/* Restore route, if needed. */
if (CHECK_FLAG(tmp_pi->flags, BGP_PATH_REMOVED))
bgp_path_info_restore(dest, tmp_pi);
/* Unintern existing, set to new. */
bgp_attr_unintern(&tmp_pi->attr);
tmp_pi->attr = attr_new;
tmp_pi->uptime = monotime(NULL);
}
}
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 src_afi,
safi_t src_safi)
{
afi_t afi = AFI_L2VPN;
safi_t safi = SAFI_EVPN;
struct attr attr;
struct bgp_dest *dest = NULL;
struct bgp *bgp_evpn = NULL;
int route_changed = 0;
bgp_evpn = bgp_get_evpn();
if (!bgp_evpn)
return 0;
/* Build path attribute for this route - use the source attr, if
* present, else treat as locally originated.
*/
if (src_attr)
attr = *src_attr;
else {
memset(&attr, 0, sizeof(attr));
bgp_attr_default_set(&attr, bgp_vrf, BGP_ORIGIN_IGP);
}
/* Advertise Primary IP (PIP) is enabled, send individual
* IP (default instance router-id) as nexthop.
* PIP is disabled or vrr interface is not present
* use anycast-IP as nexthop and anycast RMAC.
*/
if (!bgp_vrf->evpn_info->advertise_pip ||
(!bgp_vrf->evpn_info->is_anycast_mac)) {
attr.nexthop = bgp_vrf->originator_ip;
attr.mp_nexthop_global_in = bgp_vrf->originator_ip;
memcpy(&attr.rmac, &bgp_vrf->rmac, ETH_ALEN);
} else {
/* copy sys rmac */
memcpy(&attr.rmac, &bgp_vrf->evpn_info->pip_rmac, ETH_ALEN);
if (bgp_vrf->evpn_info->pip_ip.s_addr != INADDR_ANY) {
attr.nexthop = bgp_vrf->evpn_info->pip_ip;
attr.mp_nexthop_global_in = bgp_vrf->evpn_info->pip_ip;
} else if (bgp_vrf->evpn_info->pip_ip.s_addr == INADDR_ANY)
if (bgp_debug_zebra(NULL))
zlog_debug(
"VRF %s evp %pFX advertise-pip primary ip is not configured",
vrf_id_to_name(bgp_vrf->vrf_id), evp);
}
if (bgp_debug_zebra(NULL))
zlog_debug(
"VRF %s type-5 route evp %pFX RMAC %pEA nexthop %pI4",
vrf_id_to_name(bgp_vrf->vrf_id), evp, &attr.rmac,
&attr.nexthop);
attr.mp_nexthop_len = BGP_ATTR_NHLEN_IPV4;
if (src_afi == AFI_IP6 &&
CHECK_FLAG(bgp_vrf->af_flags[AFI_L2VPN][SAFI_EVPN],
BGP_L2VPN_EVPN_ADV_IPV6_UNICAST_GW_IP)) {
if (src_attr &&
!IN6_IS_ADDR_UNSPECIFIED(&src_attr->mp_nexthop_global)) {
attr.evpn_overlay.type = OVERLAY_INDEX_GATEWAY_IP;
SET_IPADDR_V6(&attr.evpn_overlay.gw_ip);
memcpy(&attr.evpn_overlay.gw_ip.ipaddr_v6,
&src_attr->mp_nexthop_global,
sizeof(struct in6_addr));
}
} else if (src_afi == AFI_IP &&
CHECK_FLAG(bgp_vrf->af_flags[AFI_L2VPN][SAFI_EVPN],
BGP_L2VPN_EVPN_ADV_IPV4_UNICAST_GW_IP)) {
if (src_attr && src_attr->nexthop.s_addr != 0) {
attr.evpn_overlay.type = OVERLAY_INDEX_GATEWAY_IP;
SET_IPADDR_V4(&attr.evpn_overlay.gw_ip);
memcpy(&attr.evpn_overlay.gw_ip.ipaddr_v4,
&src_attr->nexthop, sizeof(struct in_addr));
}
}
/* Setup RT and encap extended community */
build_evpn_type5_route_extcomm(bgp_vrf, &attr);
/* get the route node in global table */
dest = bgp_global_evpn_node_get(bgp_evpn->rib[afi][safi], afi, safi,
(const struct prefix_evpn *)evp,
&bgp_vrf->vrf_prd);
assert(dest);
/* create or update the route entry within the route node */
update_evpn_type5_route_entry(bgp_evpn, bgp_vrf, afi, safi, dest, &attr,
&route_changed);
/* schedule for processing and unlock node */
if (route_changed) {
bgp_process(bgp_evpn, dest, afi, safi);
bgp_dest_unlock_node(dest);
}
/* uninten temporary */
if (!src_attr)
aspath_unintern(&attr.aspath);
return 0;
}
static void bgp_evpn_get_sync_info(struct bgp *bgp, esi_t *esi,
struct bgp_dest *dest, uint32_t loc_seq,
uint32_t *max_sync_seq, bool *active_on_peer,
bool *peer_router, bool *proxy_from_peer)
{
struct bgp_path_info *tmp_pi;
struct bgp_path_info *second_best_path = NULL;
uint32_t tmp_mm_seq = 0;
esi_t *tmp_esi;
int paths_eq;
/* find the best non-local path. a local path can only be present
* as best path
*/
for (tmp_pi = bgp_dest_get_bgp_path_info(dest); tmp_pi;
tmp_pi = tmp_pi->next) {
if (tmp_pi->sub_type != BGP_ROUTE_IMPORTED ||
!CHECK_FLAG(tmp_pi->flags, BGP_PATH_VALID))
continue;
if (bgp_evpn_path_info_cmp(bgp, tmp_pi,
second_best_path, &paths_eq))
second_best_path = tmp_pi;
}
if (!second_best_path)
return;
tmp_esi = bgp_evpn_attr_get_esi(second_best_path->attr);
/* if this has the same ES desination as the local path
* it is a sync path
*/
if (!memcmp(esi, tmp_esi, sizeof(esi_t))) {
tmp_mm_seq = mac_mobility_seqnum(second_best_path->attr);
if (tmp_mm_seq < loc_seq)
return;
/* we have a non-proxy path from the ES peer. */
if (second_best_path->attr->es_flags &
ATTR_ES_PROXY_ADVERT) {
*proxy_from_peer = true;
} else {
*active_on_peer = true;
}
if (second_best_path->attr->router_flag)
*peer_router = true;
/* we use both proxy and non-proxy imports to
* determine the max sync sequence
*/
if (tmp_mm_seq > *max_sync_seq)
*max_sync_seq = tmp_mm_seq;
}
}
/* Bubble up sync-info from all paths (non-best) to the local-path.
* This is need for MM sequence number syncing and proxy advertisement.
* Note: The local path can only exist as a best path in the
* VPN route table. It will take precedence over all sync paths.
*/
static void update_evpn_route_entry_sync_info(struct bgp *bgp,
struct bgp_dest *dest,
struct attr *attr,
uint32_t loc_seq, bool setup_sync)
{
esi_t *esi;
struct prefix_evpn *evp =
(struct prefix_evpn *)bgp_dest_get_prefix(dest);
if (evp->prefix.route_type != BGP_EVPN_MAC_IP_ROUTE)
return;
esi = bgp_evpn_attr_get_esi(attr);
if (bgp_evpn_is_esi_valid(esi)) {
if (setup_sync) {
uint32_t max_sync_seq = 0;
bool active_on_peer = false;
bool peer_router = false;
bool proxy_from_peer = false;
bgp_evpn_get_sync_info(bgp, esi, dest, loc_seq,
&max_sync_seq, &active_on_peer,
&peer_router, &proxy_from_peer);
attr->mm_sync_seqnum = max_sync_seq;
if (active_on_peer)
attr->es_flags |= ATTR_ES_PEER_ACTIVE;
else
attr->es_flags &= ~ATTR_ES_PEER_ACTIVE;
if (proxy_from_peer)
attr->es_flags |= ATTR_ES_PEER_PROXY;
else
attr->es_flags &= ~ATTR_ES_PEER_PROXY;
if (peer_router)
attr->es_flags |= ATTR_ES_PEER_ROUTER;
else
attr->es_flags &= ~ATTR_ES_PEER_ROUTER;
if (BGP_DEBUG(evpn_mh, EVPN_MH_RT)) {
char esi_buf[ESI_STR_LEN];
zlog_debug(
"setup sync info for %pFX es %s max_seq %d %s%s%s",
evp,
esi_to_str(esi, esi_buf,
sizeof(esi_buf)),
max_sync_seq,
(attr->es_flags & ATTR_ES_PEER_ACTIVE)
? "peer-active "
: "",
(attr->es_flags & ATTR_ES_PEER_PROXY)
? "peer-proxy "
: "",
(attr->es_flags & ATTR_ES_PEER_ROUTER)
? "peer-router "
: "");
}
}
} else {
attr->mm_sync_seqnum = 0;
attr->es_flags &= ~ATTR_ES_PEER_ACTIVE;
attr->es_flags &= ~ATTR_ES_PEER_PROXY;
}
}
/*
* 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_dest *dest, struct attr *attr,
int add, struct bgp_path_info **pi,
uint8_t flags, uint32_t seq, bool vpn_rt,
bool *old_is_sync)
{
struct bgp_path_info *tmp_pi;
struct bgp_path_info *local_pi;
struct attr *attr_new;
mpls_label_t label[BGP_MAX_LABELS];
uint32_t num_labels = 1;
int route_change = 1;
uint8_t sticky = 0;
const struct prefix_evpn *evp;
*pi = NULL;
evp = (const struct prefix_evpn *)bgp_dest_get_prefix(dest);
memset(&label, 0, sizeof(label));
/* See if this is an update of an existing route, or a new add. */
local_pi = bgp_evpn_route_get_local_path(bgp, dest);
/* 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;
if (old_is_sync && local_pi)
*old_is_sync = bgp_evpn_attr_is_sync(local_pi->attr);
/* if a local path is being added with a non-zero esi look
* for SYNC paths from ES peers and bubble up the sync-info
*/
update_evpn_route_entry_sync_info(bgp, dest, attr, seq, vpn_rt);
/* 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, dest);
SET_FLAG(tmp_pi->flags, BGP_PATH_VALID);
bgp_path_info_extra_get(tmp_pi);
/* The VNI goes into the 'label' field of the route */
vni2label(vpn->vni, &label[0]);
/* Type-2 routes may carry a second VNI - the L3-VNI.
* Only attach second label if we are advertising two labels for
* type-2 routes.
*/
if (evp->prefix.route_type == BGP_EVPN_MAC_IP_ROUTE
&& CHECK_FLAG(vpn->flags, VNI_FLAG_USE_TWO_LABELS)) {
vni_t l3vni;
l3vni = bgpevpn_get_l3vni(vpn);
if (l3vni) {
vni2label(l3vni, &label[1]);
num_labels++;
}
}
memcpy(&tmp_pi->extra->label, label, sizeof(label));
tmp_pi->extra->num_labels = num_labels;
/* Mark route as self type-2 route */
if (flags && CHECK_FLAG(flags, ZEBRA_MACIP_TYPE_SVI_IP))
tmp_pi->extra->af_flags = BGP_EVPN_MACIP_TYPE_SVI_IP;
bgp_path_info_add(dest, 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(dest, 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(dest, tmp_pi);
/* Unintern existing, set to new. */
bgp_attr_unintern(&tmp_pi->attr);
tmp_pi->attr = attr_new;
tmp_pi->uptime = monotime(NULL);
}
}
/* local MAC-IP routes in the VNI table are linked to
* the destination ES
*/
if (route_change && vpn_rt
&& (evp->prefix.route_type == BGP_EVPN_MAC_IP_ROUTE))
bgp_evpn_path_es_link(tmp_pi, vpn->vni,
bgp_evpn_attr_get_esi(tmp_pi->attr));
/* 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_dest *dest)
{
struct bgp_path_info *tmp_ri;
struct bgp_path_info *curr_select = NULL;
for (tmp_ri = bgp_dest_get_bgp_path_info(dest); 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 ||
bgp_evpn_attr_is_sync(curr_select->attr)))
evpn_zebra_install(bgp, vpn,
(const struct prefix_evpn *)bgp_dest_get_prefix(dest),
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_dest *dest,
struct bgp_path_info *local_pi)
{
/* local path was not picked as the winner; kick it out */
if (bgp_debug_zebra(NULL))
zlog_debug("evicting local evpn prefix %pBD as remote won",
dest);
evpn_delete_old_local_route(bgp, vpn, dest, local_pi, NULL);
bgp_path_info_reap(dest, local_pi);
/* tell zebra to re-add the best remote path */
evpn_zebra_reinstall_best_route(bgp, vpn, dest);
}
static inline bool bgp_evpn_route_add_l3_ecomm_ok(struct bgpevpn *vpn,
const struct prefix_evpn *p,
esi_t *esi)
{
return p->prefix.route_type == BGP_EVPN_MAC_IP_ROUTE
&& (is_evpn_prefix_ipaddr_v4(p)
|| (is_evpn_prefix_ipaddr_v6(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) && bgp_evpn_es_add_l3_ecomm_ok(esi);
}
/*
* 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, esi_t *esi)
{
struct bgp_dest *dest;
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;
bool old_is_sync = false;
memset(&attr, 0, sizeof(attr));
/* Build path-attribute for this route. */
bgp_attr_default_set(&attr, bgp, 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;
if (CHECK_FLAG(flags, ZEBRA_MACIP_TYPE_PROXY_ADVERT))
attr.es_flags |= ATTR_ES_PROXY_ADVERT;
if (esi && bgp_evpn_is_esi_valid(esi)) {
memcpy(&attr.esi, esi, sizeof(esi_t));
attr.es_flags |= ATTR_ES_IS_LOCAL;
}
/* 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);
bgp_attr_set_pmsi_tnl_type(&attr, PMSI_TNLTYPE_INGR_REPL);
}
/* router mac is only needed for type-2 routes here. */
if (p->prefix.route_type == BGP_EVPN_MAC_IP_ROUTE) {
uint8_t af_flags = 0;
if (CHECK_FLAG(flags, ZEBRA_MACIP_TYPE_SVI_IP))
SET_FLAG(af_flags, BGP_EVPN_MACIP_TYPE_SVI_IP);
bgp_evpn_get_rmac_nexthop(vpn, p, &attr, af_flags);
}
if (bgp_debug_zebra(NULL)) {
char buf3[ESI_STR_LEN];
zlog_debug(
"VRF %s vni %u type-2 route evp %pFX RMAC %pEA nexthop %pI4 esi %s",
vpn->bgp_vrf ? vrf_id_to_name(vpn->bgp_vrf->vrf_id)
: " ",
vpn->vni, p, &attr.rmac, &attr.mp_nexthop_global_in,
esi_to_str(esi, buf3, sizeof(buf3)));
}
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.
*/
add_l3_ecomm = bgp_evpn_route_add_l3_ecomm_ok(
vpn, p, (attr.es_flags & ATTR_ES_IS_LOCAL) ? &attr.esi : NULL);
/* 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. */
dest = bgp_node_get(vpn->route_table, (struct prefix *)p);
/* Create or update route entry. */
route_change = update_evpn_route_entry(bgp, vpn, afi, safi, dest, &attr,
1, &pi, flags, seq,
true /* setup_sync */, &old_is_sync);
assert(pi);
attr_new = pi->attr;
/* lock ri to prevent freeing in evpn_route_select_install */
bgp_path_info_lock(pi);
/* Perform route selection. Normally, the local route in the
* VNI is expected to win and be the best route. However, if
* there is a race condition where a host moved from local to
* remote and the remote route was received in BGP just prior
* to the local MACIP notification from zebra, the remote
* route would win, and we should evict the defunct local route
* and (re)install the remote route into zebra.
*/
evpn_route_select_install(bgp, vpn, dest);
/*
* 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_REMOVED)) {
route_change = 0;
} else {
if (!CHECK_FLAG(pi->flags, BGP_PATH_SELECTED)) {
route_change = 0;
evpn_cleanup_local_non_best_route(bgp, vpn, dest, pi);
} else {
bool new_is_sync;
/* If the local path already existed and is still the
* best path we need to also check if it transitioned
* from being a sync path to a non-sync path. If it
* it did we need to notify zebra that the sync-path
* has been removed.
*/
new_is_sync = bgp_evpn_attr_is_sync(pi->attr);
if (!new_is_sync && old_is_sync)
evpn_zebra_uninstall(bgp, vpn, p, zero_vtep_ip);
}
}
bgp_path_info_unlock(pi);
bgp_dest_unlock_node(dest);
/* 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;
dest = bgp_global_evpn_node_get(bgp->rib[afi][safi], afi, safi,
(const struct prefix_evpn *)p,
&vpn->prd);
update_evpn_route_entry(bgp, vpn, afi, safi, dest, attr_new, 1,
&global_pi, flags, seq,
false /* setup_sync */, NULL /* old_is_sync */);
/* Schedule for processing and unlock node. */
bgp_process(bgp, dest, afi, safi);
bgp_dest_unlock_node(dest);
}
/* Unintern temporary. */
aspath_unintern(&attr.aspath);
return 0;
}
/*
* Delete EVPN route entry.
* The entry can be in ESI/VNI table or the global table.
*/
void delete_evpn_route_entry(struct bgp *bgp, afi_t afi, safi_t safi,
struct bgp_dest *dest,
struct bgp_path_info **pi)
{
struct bgp_path_info *tmp_pi;
*pi = NULL;
/* Now, find matching route. */
for (tmp_pi = bgp_dest_get_bgp_path_info(dest); 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(dest, tmp_pi);
}
/* 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_dest *dest = 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 */
dest = bgp_global_evpn_node_lookup(bgp_evpn->rib[afi][safi], afi, safi,
(const struct prefix_evpn *)evp, &bgp_vrf->vrf_prd);
if (!dest)
return 0;
delete_evpn_route_entry(bgp_evpn, afi, safi, dest, &pi);
if (pi)
bgp_process(bgp_evpn, dest, afi, safi);
bgp_dest_unlock_node(dest);
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_dest *dest, *global_dest;
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. */
dest = bgp_node_lookup(vpn->route_table, (struct prefix *)p);
if (!dest)
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_dest = bgp_global_evpn_node_lookup(bgp->rib[afi][safi], afi, safi,
(const struct prefix_evpn *)p, &vpn->prd);
if (global_dest) {
/* Delete route entry in the global EVPN table. */
delete_evpn_route_entry(bgp, afi, safi, global_dest, &pi);
/* Schedule for processing - withdraws to peers happen from
* this table.
*/
if (pi)
bgp_process(bgp, global_dest, afi, safi);
bgp_dest_unlock_node(global_dest);
}
/* Delete route entry in the VNI route table. This can just be removed.
*/
delete_evpn_route_entry(bgp, afi, safi, dest, &pi);
if (pi) {
bgp_path_info_reap(dest, pi);
evpn_route_select_install(bgp, vpn, dest);
}
bgp_dest_unlock_node(dest);
return 0;
}
void bgp_evpn_update_type2_route_entry(struct bgp *bgp, struct bgpevpn *vpn,
struct bgp_dest *dest,
struct bgp_path_info *local_pi,
const char *caller)
{
afi_t afi = AFI_L2VPN;
safi_t safi = SAFI_EVPN;
struct bgp_path_info *pi;
struct attr attr;
struct attr *attr_new;
uint32_t seq;
int add_l3_ecomm = 0;
struct bgp_dest *global_dest;
struct bgp_path_info *global_pi;
struct prefix_evpn *evp =
(struct prefix_evpn *)bgp_dest_get_prefix(dest);
int route_change;
bool old_is_sync = false;
if (CHECK_FLAG(local_pi->flags, BGP_PATH_REMOVED))
return;
/*
* 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, 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 = (local_pi->attr->sticky) ? 1 : 0;
attr.router_flag = (local_pi->attr->router_flag) ? 1 : 0;
attr.es_flags = local_pi->attr->es_flags;
if (local_pi->attr->default_gw) {
attr.default_gw = 1;
if (is_evpn_prefix_ipaddr_v6(evp))
attr.router_flag = 1;
}
memcpy(&attr.esi, &local_pi->attr->esi, sizeof(esi_t));
bgp_evpn_get_rmac_nexthop(vpn, evp, &attr,
local_pi->extra->af_flags);
vni2label(vpn->vni, &(attr.label));
/* Add L3 VNI RTs and RMAC for non IPv6 link-local if
* using L3 VNI for type-2 routes also.
*/
add_l3_ecomm = bgp_evpn_route_add_l3_ecomm_ok(
vpn, evp,
(attr.es_flags & ATTR_ES_IS_LOCAL) ? &attr.esi : NULL);
/* Set up extended community. */
build_evpn_route_extcomm(vpn, &attr, add_l3_ecomm);
seq = mac_mobility_seqnum(local_pi->attr);
if (bgp_debug_zebra(NULL)) {
char buf3[ESI_STR_LEN];
zlog_debug(
"VRF %s vni %u evp %pFX RMAC %pEA nexthop %pI4 esi %s esf 0x%x from %s",
vpn->bgp_vrf ? vrf_id_to_name(vpn->bgp_vrf->vrf_id)
: " ",
vpn->vni, evp, &attr.rmac, &attr.mp_nexthop_global_in,
esi_to_str(&attr.esi, buf3, sizeof(buf3)),
attr.es_flags, caller);
}
/* Update the route entry. */
route_change = update_evpn_route_entry(
bgp, vpn, afi, safi, dest, &attr, 0, &pi, 0, seq,
true /* setup_sync */, &old_is_sync);
assert(pi);
attr_new = pi->attr;
/* lock ri to prevent freeing in evpn_route_select_install */
bgp_path_info_lock(pi);
/* Perform route selection. Normally, the local route in the
* VNI is expected to win and be the best route. However,
* under peculiar situations (e.g., tunnel (next hop) IP change
* that causes best selection to be based on next hop), a
* remote route could win. If the local route is the best,
* ensure it is updated in the global EVPN route table and
* advertised to peers; otherwise, ensure it is evicted and
* (re)install the remote route into zebra.
*/
evpn_route_select_install(bgp, vpn, dest);
if (CHECK_FLAG(pi->flags, BGP_PATH_REMOVED)) {
route_change = 0;
} else {
if (!CHECK_FLAG(pi->flags, BGP_PATH_SELECTED)) {
route_change = 0;
evpn_cleanup_local_non_best_route(bgp, vpn, dest, pi);
} else {
bool new_is_sync;
/* If the local path already existed and is still the
* best path we need to also check if it transitioned
* from being a sync path to a non-sync path. If it
* it did we need to notify zebra that the sync-path
* has been removed.
*/
new_is_sync = bgp_evpn_attr_is_sync(pi->attr);
if (!new_is_sync && old_is_sync)
evpn_zebra_uninstall(bgp, vpn,
evp, zero_vtep_ip);
}
}
/* unlock pi */
bgp_path_info_unlock(pi);
if (route_change) {
/* Update route in global routing table. */
global_dest = bgp_global_evpn_node_get(bgp->rib[afi][safi], afi,
safi, evp, &vpn->prd);
assert(global_dest);
update_evpn_route_entry(
bgp, vpn, afi, safi, global_dest, attr_new, 0,
&global_pi, 0, mac_mobility_seqnum(attr_new),
false /* setup_sync */, NULL /* old_is_sync */);
/* Schedule for processing and unlock node. */
bgp_process(bgp, global_dest, afi, safi);
bgp_dest_unlock_node(global_dest);
}
/* Unintern temporary. */
aspath_unintern(&attr.aspath);
}
/*
* 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)
{
struct bgp_dest *dest;
struct bgp_path_info *tmp_pi;
/* 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 (dest = bgp_table_top(vpn->route_table); dest;
dest = bgp_route_next(dest)) {
const struct prefix_evpn *evp =
(const struct prefix_evpn *)bgp_dest_get_prefix(dest);
if (evp->prefix.route_type != BGP_EVPN_MAC_IP_ROUTE)
continue;
/* Identify local route. */
for (tmp_pi = bgp_dest_get_bgp_path_info(dest); 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;
bgp_evpn_update_type2_route_entry(bgp, vpn, dest, tmp_pi,
__func__);
}
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 void delete_global_type2_routes(struct bgp *bgp, struct bgpevpn *vpn)
{
afi_t afi;
safi_t safi;
struct bgp_dest *rddest, *dest;
struct bgp_table *table;
struct bgp_path_info *pi;
afi = AFI_L2VPN;
safi = SAFI_EVPN;
rddest = bgp_node_lookup(bgp->rib[afi][safi],
(struct prefix *)&vpn->prd);
if (rddest) {
table = bgp_dest_get_bgp_table_info(rddest);
for (dest = bgp_table_top(table); dest;
dest = bgp_route_next(dest)) {
const struct prefix_evpn *evp =
(const struct prefix_evpn *)bgp_dest_get_prefix(
dest);
if (evp->prefix.route_type != BGP_EVPN_MAC_IP_ROUTE)
continue;
delete_evpn_route_entry(bgp, afi, safi, dest, &pi);
if (pi)
bgp_process(bgp, dest, afi, safi);
}
/* Unlock RD node. */
bgp_dest_unlock_node(rddest);
}
}
/*
* 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_dest *dest;
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 (dest = bgp_table_top(vpn->route_table); dest;
dest = bgp_route_next(dest)) {
const struct prefix_evpn *evp =
(const struct prefix_evpn *)bgp_dest_get_prefix(dest);
if (evp->prefix.route_type != BGP_EVPN_MAC_IP_ROUTE)
continue;
delete_evpn_route_entry(bgp, afi, safi, dest, &pi);
/* Route entry in local table gets deleted immediately. */
if (pi)
bgp_path_info_reap(dest, 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_dest *dest;
struct bgp_path_info *pi, *nextpi;
/* Walk this VNI's route table and delete all routes. */
for (dest = bgp_table_top(vpn->route_table); dest;
dest = bgp_route_next(dest)) {
for (pi = bgp_dest_get_bgp_path_info(dest);
(pi != NULL) && (nextpi = pi->next, 1); pi = nextpi) {
bgp_evpn_remote_ip_hash_del(vpn, pi);
bgp_path_info_delete(dest, pi);
bgp_path_info_reap(dest, pi);
}
}
return 0;
}
/* BUM traffic flood mode per-l2-vni */
static int bgp_evpn_vni_flood_mode_get(struct bgp *bgp,
struct bgpevpn *vpn)
{
/* if flooding has been globally disabled per-vni mode is
* not relevant
*/
if (bgp->vxlan_flood_ctrl == VXLAN_FLOOD_DISABLED)
return VXLAN_FLOOD_DISABLED;
/* if mcast group ip has been specified we use a PIM-SM MDT */
if (vpn->mcast_grp.s_addr != INADDR_ANY)
return VXLAN_FLOOD_PIM_SM;
/* default is ingress replication */
return VXLAN_FLOOD_HEAD_END_REPL;
}
/*
* Update (and advertise) local routes for a VNI. Invoked upon the VNI
* export RT getting modified or change to tunnel IP. Note that these
* situations need the route in the per-VNI table as well as the global
* table to be updated (as attributes change).
*/
int update_routes_for_vni(struct bgp *bgp, struct bgpevpn *vpn)
{
int ret;
struct prefix_evpn p;
update_type1_routes_for_evi(bgp, vpn);
/* 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, NULL);
if (ret)
return ret;
}
return update_all_type2_routes(bgp, vpn);
}
/*
* 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_dest *dest, struct attr *attr)
{
struct attr *attr_new;
struct bgp_path_info *pi;
/* Add (or update) attribute to hash. */
attr_new = bgp_attr_intern(attr);
/* Create new route with its attribute. */
pi = info_make(parent_pi->type, BGP_ROUTE_IMPORTED, 0, parent_pi->peer,
attr_new, dest);
SET_FLAG(pi->flags, BGP_PATH_VALID);
bgp_path_info_extra_get(pi);
pi->extra->parent = bgp_path_info_lock(parent_pi);
bgp_dest_lock_node((struct bgp_dest *)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;
pi->extra->igpmetric = parent_pi->extra->igpmetric;
}
bgp_path_info_add(dest, pi);
return pi;
}
/*
* Install route entry into the VRF routing table and invoke route selection.
*/
static int install_evpn_route_entry_in_vrf(struct bgp *bgp_vrf,
const struct prefix_evpn *evp,
struct bgp_path_info *parent_pi)
{
struct bgp_dest *dest;
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;
bool new_pi = false;
bool use_l3nhg = false;
bool is_l3nhg_active = false;
char buf1[INET6_ADDRSTRLEN];
memset(pp, 0, sizeof(struct prefix));
ip_prefix_from_evpn_prefix(evp, pp);
if (bgp_debug_zebra(NULL))
zlog_debug(
"vrf %s: import evpn prefix %pFX parent %p flags 0x%x",
vrf_id_to_name(bgp_vrf->vrf_id), evp, parent_pi,
parent_pi->flags);
/* 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;
dest = bgp_node_get(bgp_vrf->rib[afi][safi], pp);
} else if (is_evpn_prefix_ipaddr_v6(evp)) {
afi = AFI_IP6;
safi = SAFI_UNICAST;
dest = bgp_node_get(bgp_vrf->rib[afi][safi], pp);
} else
return 0;
/* EVPN routes currently only support a IPv4 next hop which corresponds
* to the remote VTEP. When importing into a VRF, if it is IPv6 host
* or prefix route, we have to convert the next hop to an IPv4-mapped
* address for the rest of the code to flow through. In the case of IPv4,
* make sure to set the flag for next hop attribute.
*/
attr = *parent_pi->attr;
if (attr.evpn_overlay.type != OVERLAY_INDEX_GATEWAY_IP) {
if (afi == AFI_IP6)
evpn_convert_nexthop_to_ipv6(&attr);
else {
attr.nexthop = attr.mp_nexthop_global_in;
attr.flag |= ATTR_FLAG_BIT(BGP_ATTR_NEXT_HOP);
}
} else {
/*
* If gateway IP overlay index is specified in the NLRI of
* EVPN RT-5, this gateway IP should be used as the nexthop
* for the prefix in the VRF
*/
if (bgp_debug_zebra(NULL)) {
zlog_debug(
"Install gateway IP %s as nexthop for prefix %pFX in vrf %s",
inet_ntop(pp->family, &attr.evpn_overlay.gw_ip,
buf1, sizeof(buf1)), pp,
vrf_id_to_name(bgp_vrf->vrf_id));
}
if (afi == AFI_IP6) {
memcpy(&attr.mp_nexthop_global,
&attr.evpn_overlay.gw_ip.ipaddr_v6,
sizeof(struct in6_addr));
attr.mp_nexthop_len = IPV6_MAX_BYTELEN;
} else {
attr.nexthop = attr.evpn_overlay.gw_ip.ipaddr_v4;
attr.flag |= ATTR_FLAG_BIT(BGP_ATTR_NEXT_HOP);
}
}
bgp_evpn_es_vrf_use_nhg(bgp_vrf, &parent_pi->attr->esi, &use_l3nhg,
&is_l3nhg_active, NULL);
if (use_l3nhg)
attr.es_flags |= ATTR_ES_L3_NHG_USE;
if (is_l3nhg_active)
attr.es_flags |= ATTR_ES_L3_NHG_ACTIVE;
/* Check if route entry is already present. */
for (pi = bgp_dest_get_bgp_path_info(dest); 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, dest, &attr);
new_pi = true;
} else {
if (attrhash_cmp(pi->attr, &attr)
&& !CHECK_FLAG(pi->flags, BGP_PATH_REMOVED)) {
bgp_dest_unlock_node(dest);
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(dest, 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(dest, pi, BGP_PATH_ATTR_CHANGED);
/* Unintern existing, set to new. */
bgp_attr_unintern(&pi->attr);
pi->attr = attr_new;
pi->uptime = monotime(NULL);
}
/* Gateway IP nexthop should be resolved */
if (attr.evpn_overlay.type == OVERLAY_INDEX_GATEWAY_IP) {
if (bgp_find_or_add_nexthop(bgp_vrf, bgp_vrf, afi, safi, pi,
NULL, 0, NULL))
bgp_path_info_set_flag(dest, pi, BGP_PATH_VALID);
else {
if (BGP_DEBUG(nht, NHT)) {
inet_ntop(pp->family,
&attr.evpn_overlay.gw_ip,
buf1, sizeof(buf1));
zlog_debug("%s: gateway IP NH unresolved",
buf1);
}
bgp_path_info_unset_flag(dest, pi, BGP_PATH_VALID);
}
} else {
/* as it is an importation, change nexthop */
bgp_path_info_set_flag(dest, pi, BGP_PATH_ANNC_NH_SELF);
}
/* Link path to evpn nexthop */
bgp_evpn_path_nh_add(bgp_vrf, pi);
bgp_aggregate_increment(bgp_vrf, bgp_dest_get_prefix(dest), pi, afi,
safi);
/* Perform route selection and update zebra, if required. */
bgp_process(bgp_vrf, dest, afi, safi);
/* Process for route leaking. */
vpn_leak_from_vrf_update(bgp_get_default(), bgp_vrf, pi);
bgp_dest_unlock_node(dest);
if (bgp_debug_zebra(NULL))
zlog_debug("... %s pi dest %p (l %d) pi %p (l %d, f 0x%x)",
new_pi ? "new" : "update", dest,
bgp_dest_get_lock_count(dest), pi, pi->lock,
pi->flags);
return ret;
}
/*
* Install route entry into the VNI routing table and invoke route selection.
*/
static int install_evpn_route_entry(struct bgp *bgp, struct bgpevpn *vpn,
const struct prefix_evpn *p,
struct bgp_path_info *parent_pi)
{
struct bgp_dest *dest;
struct bgp_path_info *pi;
struct bgp_path_info *local_pi;
struct attr *attr_new;
int ret;
struct prefix_evpn ad_evp;
bool old_local_es = false;
bool new_local_es;
/* EAD prefix in the global table doesn't include the VTEP-IP so
* we need to create a different copy for the VNI
*/
if (p->prefix.route_type == BGP_EVPN_AD_ROUTE)
p = evpn_type1_prefix_vni_copy(&ad_evp, p,
parent_pi->attr->nexthop);
/* Create (or fetch) route within the VNI. */
/* NOTE: There is no RD here. */
dest = bgp_node_get(vpn->route_table, (struct prefix *)p);
/* Check if route entry is already present. */
for (pi = bgp_dest_get_bgp_path_info(dest); pi; pi = pi->next)
if (pi->extra
&& (struct bgp_path_info *)pi->extra->parent == parent_pi)
break;
if (!pi) {
/* Create an info */
pi = bgp_create_evpn_bgp_path_info(parent_pi, dest,
parent_pi->attr);
new_local_es = bgp_evpn_attr_is_local_es(pi->attr);
} else {
if (attrhash_cmp(pi->attr, parent_pi->attr)
&& !CHECK_FLAG(pi->flags, BGP_PATH_REMOVED)) {
bgp_dest_unlock_node(dest);
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(dest, pi);
/* Mark if nexthop has changed. */
if (!IPV4_ADDR_SAME(&pi->attr->nexthop, &attr_new->nexthop))
SET_FLAG(pi->flags, BGP_PATH_IGP_CHANGED);
old_local_es = bgp_evpn_attr_is_local_es(pi->attr);
new_local_es = bgp_evpn_attr_is_local_es(attr_new);
/* If ESI is different or if its type has changed we
* need to reinstall the path in zebra
*/
if ((old_local_es != new_local_es)
|| memcmp(&pi->attr->esi, &attr_new->esi,
sizeof(attr_new->esi))) {
if (BGP_DEBUG(evpn_mh, EVPN_MH_RT))
zlog_debug("VNI %d path %pFX chg to %s es",
vpn->vni, &pi->net->p,
new_local_es ? "local"
: "non-local");
bgp_path_info_set_flag(dest, pi, BGP_PATH_ATTR_CHANGED);
}
/* Unintern existing, set to new. */
bgp_attr_unintern(&pi->attr);
pi->attr = attr_new;
pi->uptime = monotime(NULL);
}
/* Add this route to remote IP hashtable */
bgp_evpn_remote_ip_hash_add(vpn, pi);
/* Perform route selection and update zebra, if required. */
ret = evpn_route_select_install(bgp, vpn, dest);
/* if the best path is a local path with a non-zero ES
* sync info against the local path may need to be updated
* when a remote path is added/updated (including changes
* from sync-path to remote-path)
*/
local_pi = bgp_evpn_route_get_local_path(bgp, dest);
if (local_pi && (old_local_es || new_local_es))
bgp_evpn_update_type2_route_entry(bgp, vpn, dest, local_pi,
__func__);
bgp_dest_unlock_node(dest);
return ret;
}
/*
* Uninstall route entry from the VRF routing table and send message
* to zebra, if appropriate.
*/
static int uninstall_evpn_route_entry_in_vrf(struct bgp *bgp_vrf,
const struct prefix_evpn *evp,
struct bgp_path_info *parent_pi)
{
struct bgp_dest *dest;
struct bgp_path_info *pi;
int ret = 0;
struct prefix p;
struct prefix *pp = &p;
afi_t afi = 0;
safi_t safi = 0;
memset(pp, 0, sizeof(struct prefix));
ip_prefix_from_evpn_prefix(evp, pp);
if (bgp_debug_zebra(NULL))
zlog_debug(
"vrf %s: unimport evpn prefix %pFX parent %p flags 0x%x",
vrf_id_to_name(bgp_vrf->vrf_id), evp, parent_pi,
parent_pi->flags);
/* Locate route within the VRF. */
/* NOTE: There is no RD here. */
if (is_evpn_prefix_ipaddr_v4(evp)) {
afi = AFI_IP;
safi = SAFI_UNICAST;
dest = bgp_node_lookup(bgp_vrf->rib[afi][safi], pp);
} else {
afi = AFI_IP6;
safi = SAFI_UNICAST;
dest = bgp_node_lookup(bgp_vrf->rib[afi][safi], pp);
}
if (!dest)
return 0;
/* Find matching route entry. */
for (pi = bgp_dest_get_bgp_path_info(dest); pi; pi = pi->next)
if (pi->extra
&& (struct bgp_path_info *)pi->extra->parent == parent_pi)
break;
if (!pi) {
bgp_dest_unlock_node(dest);
return 0;
}
if (bgp_debug_zebra(NULL))
zlog_debug("... delete dest %p (l %d) pi %p (l %d, f 0x%x)",
dest, bgp_dest_get_lock_count(dest), pi, pi->lock,
pi->flags);
/* Process for route leaking. */
vpn_leak_from_vrf_withdraw(bgp_get_default(), bgp_vrf, pi);
bgp_aggregate_decrement(bgp_vrf, bgp_dest_get_prefix(dest), pi, afi,
safi);
/* Mark entry for deletion */
bgp_path_info_delete(dest, pi);
/* Unlink path to evpn nexthop */
bgp_evpn_path_nh_del(bgp_vrf, pi);
/* Perform route selection and update zebra, if required. */
bgp_process(bgp_vrf, dest, afi, safi);
/* Unlock route node. */
bgp_dest_unlock_node(dest);
return ret;
}
/*
* Uninstall route entry from the VNI routing table and send message
* to zebra, if appropriate.
*/
static int uninstall_evpn_route_entry(struct bgp *bgp, struct bgpevpn *vpn,
const struct prefix_evpn *p,
struct bgp_path_info *parent_pi)
{
struct bgp_dest *dest;
struct bgp_path_info *pi;
struct bgp_path_info *local_pi;
int ret;
struct prefix_evpn ad_evp;
/* EAD prefix in the global table doesn't include the VTEP-IP so
* we need to create a different copy for the VNI
*/
if (p->prefix.route_type == BGP_EVPN_AD_ROUTE)
p = evpn_type1_prefix_vni_copy(&ad_evp, p,
parent_pi->attr->nexthop);
/* Locate route within the VNI. */
/* NOTE: There is no RD here. */
dest = bgp_node_lookup(vpn->route_table, (struct prefix *)p);
if (!dest)
return 0;
/* Find matching route entry. */
for (pi = bgp_dest_get_bgp_path_info(dest); pi; pi = pi->next)
if (pi->extra
&& (struct bgp_path_info *)pi->extra->parent == parent_pi)
break;
if (!pi) {
bgp_dest_unlock_node(dest);
return 0;
}
bgp_evpn_remote_ip_hash_del(vpn, pi);
/* Mark entry for deletion */
bgp_path_info_delete(dest, pi);
/* Perform route selection and update zebra, if required. */
ret = evpn_route_select_install(bgp, vpn, dest);
/* if the best path is a local path with a non-zero ES
* sync info against the local path may need to be updated
* when a remote path is deleted
*/
local_pi = bgp_evpn_route_get_local_path(bgp, dest);
if (local_pi && bgp_evpn_attr_is_local_es(local_pi->attr))
bgp_evpn_update_type2_route_entry(bgp, vpn, dest, local_pi,
__func__);
/* Unlock route node. */
bgp_dest_unlock_node(dest);
return ret;
}
/*
* 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;
uint32_t 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 = bgp_attr_get_ecommunity(attr);
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 * ecom->unit_size));
eval = (struct ecommunity_val *)(ecom->val
+ (i * ecom->unit_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, ecom->unit_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;
uint32_t 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 = bgp_attr_get_ecommunity(attr);
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 * ecom->unit_size));
eval = (struct ecommunity_val *)(ecom->val
+ (i * ecom->unit_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, ecom->unit_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;
}
/* This API will scan evpn routes for checking attribute's rmac
* macthes with bgp instance router mac. It avoid installing
* route into bgp vrf table and remote rmac in bridge table.
*/
static int bgp_evpn_route_rmac_self_check(struct bgp *bgp_vrf,
const struct prefix_evpn *evp,
struct bgp_path_info *pi)
{
/* evpn route could have learnt prior to L3vni has come up,
* perform rmac check before installing route and
* remote router mac.
* The route will be removed from global bgp table once
* SVI comes up with MAC and stored in hash, triggers
* bgp_mac_rescan_all_evpn_tables.
*/
if (memcmp(&bgp_vrf->rmac, &pi->attr->rmac, ETH_ALEN) == 0) {
if (bgp_debug_update(pi->peer, NULL, NULL, 1)) {
char attr_str[BUFSIZ] = {0};
bgp_dump_attr(pi->attr, attr_str, sizeof(attr_str));
zlog_debug(
"%s: bgp %u prefix %pFX with attr %s - DENIED due to self mac",
__func__, bgp_vrf->vrf_id, evp, attr_str);
}
return 1;
}
return 0;
}
/* don't import hosts that are locally attached */
static inline bool
bgp_evpn_skip_vrf_import_of_local_es(struct bgp *bgp_vrf,
const struct prefix_evpn *evp,
struct bgp_path_info *pi, int install)
{
esi_t *esi;
if (evp->prefix.route_type == BGP_EVPN_MAC_IP_ROUTE) {
esi = bgp_evpn_attr_get_esi(pi->attr);
/* Don't import routes that point to a local destination */
if (bgp_evpn_attr_is_local_es(pi->attr)) {
if (BGP_DEBUG(evpn_mh, EVPN_MH_RT)) {
char esi_buf[ESI_STR_LEN];
zlog_debug(
"vrf %s of evpn prefix %pFX skipped, local es %s",
install ? "import" : "unimport", evp,
esi_to_str(esi, esi_buf,
sizeof(esi_buf)));
}
return true;
}
}
return false;
}
/*
* Install or uninstall a mac-ip route in the provided vrf if
* there is a rt match
*/
int bgp_evpn_route_entry_install_if_vrf_match(struct bgp *bgp_vrf,
struct bgp_path_info *pi,
int install)
{
int ret = 0;
const struct prefix_evpn *evp =
(const struct prefix_evpn *)bgp_dest_get_prefix(pi->net);
/* 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))
return 0;
if (is_route_matching_for_vrf(bgp_vrf, pi)) {
if (bgp_evpn_route_rmac_self_check(bgp_vrf, evp, pi))
return 0;
/* don't import hosts that are locally attached */
if (install && bgp_evpn_skip_vrf_import_of_local_es(
bgp_vrf, evp, pi, install))
return 0;
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 %pFX route in VRF %s",
install ? "install" : "uninstall", evp,
vrf_id_to_name(bgp_vrf->vrf_id));
}
return ret;
}
/*
* 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_dest *rd_dest, *dest;
struct bgp_table *table;
struct bgp_path_info *pi;
int ret;
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_dest = bgp_table_top(bgp_evpn->rib[afi][safi]); rd_dest;
rd_dest = bgp_route_next(rd_dest)) {
table = bgp_dest_get_bgp_table_info(rd_dest);
if (!table)
continue;
for (dest = bgp_table_top(table); dest;
dest = bgp_route_next(dest)) {
const struct prefix_evpn *evp =
(const struct prefix_evpn *)bgp_dest_get_prefix(
dest);
/* 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_dest_get_bgp_path_info(dest); pi;
pi = pi->next) {
ret = bgp_evpn_route_entry_install_if_vrf_match(
bgp_vrf, pi, install);
if (ret)
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_dest *rd_dest, *dest;
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_dest = bgp_table_top(bgp->rib[afi][safi]); rd_dest;
rd_dest = bgp_route_next(rd_dest)) {
table = bgp_dest_get_bgp_table_info(rd_dest);
if (!table)
continue;
for (dest = bgp_table_top(table); dest;
dest = bgp_route_next(dest)) {
const struct prefix_evpn *evp =
(const struct prefix_evpn *)bgp_dest_get_prefix(
dest);
if (evp->prefix.route_type != rtype)
continue;
for (pi = bgp_dest_get_bgp_path_info(dest); 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);
bgp_dest_unlock_node(rd_dest);
bgp_dest_unlock_node(dest);
return ret;
}
}
}
}
}
return 0;
}
/* 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;
ret = install_uninstall_routes_for_vni(bgp, vpn, BGP_EVPN_AD_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;
ret = install_uninstall_routes_for_vni(bgp, vpn, BGP_EVPN_AD_ROUTE,
0);
if (ret)
return ret;
return install_uninstall_routes_for_vni(bgp, vpn, BGP_EVPN_IMET_ROUTE,
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)
{
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;
/* don't import hosts that are locally attached */
if (install && bgp_evpn_skip_vrf_import_of_local_es(
bgp_vrf, evp, pi, install))
return 0;
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 %pFX in VRF %s",
bgp_def->vrf_id,
install ? "install" : "uninstall", evp,
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 bgp_evpn_install_uninstall_table(struct bgp *bgp, afi_t afi,
safi_t safi, const struct prefix *p,
struct bgp_path_info *pi,
int import, bool in_vni_rt,
bool in_vrf_rt)
{
struct prefix_evpn *evp = (struct prefix_evpn *)p;
struct attr *attr = pi->attr;
struct ecommunity *ecom;
uint32_t i;
struct prefix_evpn ad_evp;
assert(attr);
/* Only type-1, 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_AD_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;
/* EAD prefix in the global table doesn't include the VTEP-IP so
* we need to create a different copy for the VNI
*/
if (evp->prefix.route_type == BGP_EVPN_AD_ROUTE)
evp = evpn_type1_prefix_vni_copy(&ad_evp, evp, attr->nexthop);
ecom = bgp_attr_get_ecommunity(attr);
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 bgp_evpn_es *es;
/* Only deal with RTs */
pnt = (ecom->val + (i * ecom->unit_size));
eval = (struct ecommunity_val *)(ecom->val
+ (i * ecom->unit_size));
type = *pnt++;
sub_type = *pnt++;
if (sub_type != ECOMMUNITY_ROUTE_TARGET)
continue;
/* non-local MAC-IP routes in the global route table are linked
* to the destination ES
*/
if (evp->prefix.route_type == BGP_EVPN_MAC_IP_ROUTE)
bgp_evpn_path_es_link(pi, 0,
bgp_evpn_attr_get_esi(pi->attr));
/*
* 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_AD_ROUTE ||
evp->prefix.route_type == BGP_EVPN_IP_PREFIX_ROUTE) {
irt = in_vni_rt ? lookup_import_rt(bgp, eval) : NULL;
if (irt)
install_uninstall_route_in_vnis(
bgp, afi, safi, evp, pi, irt->vnis,
import);
vrf_irt = in_vrf_rt ? lookup_vrf_import_rt(eval) : NULL;
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, ecom->unit_size);
mask_ecom_global_admin(&eval_tmp, eval);
if (in_vni_rt)
irt = lookup_import_rt(bgp, &eval_tmp);
if (in_vrf_rt)
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
* import of an es route for esi2 into esi1
*/
es = bgp_evpn_es_find(&evp->prefix.es_addr.esi);
if (es && bgp_evpn_is_es_local(es))
bgp_evpn_es_route_install_uninstall(
bgp, es, afi, safi, evp, pi, import);
}
}
return 0;
}
/*
* Install or uninstall route for appropriate VNIs/ESIs.
*/
static int install_uninstall_evpn_route(struct bgp *bgp, afi_t afi, safi_t safi,
const struct prefix *p,
struct bgp_path_info *pi, int import)
{
return bgp_evpn_install_uninstall_table(bgp, afi, safi, p, pi, import,
true, true);
}
void bgp_evpn_import_type2_route(struct bgp_path_info *pi, int import)
{
struct bgp *bgp_evpn;
bgp_evpn = bgp_get_evpn();
if (!bgp_evpn)
return;
install_uninstall_evpn_route(bgp_evpn, AFI_L2VPN, SAFI_EVPN,
&pi->net->p, pi, import);
}
/*
* delete and withdraw all ipv4 and ipv6 routes in the vrf table as type-5
* routes
*/
static void delete_withdraw_vrf_routes(struct bgp *bgp_vrf)
{
/* Delete ipv4 default route and withdraw from peers */
if (evpn_default_originate_set(bgp_vrf, AFI_IP, SAFI_UNICAST))
bgp_evpn_install_uninstall_default_route(bgp_vrf, AFI_IP,
SAFI_UNICAST, false);
/* delete all ipv4 routes and withdraw from peers */
if (advertise_type5_routes(bgp_vrf, AFI_IP))
bgp_evpn_withdraw_type5_routes(bgp_vrf, AFI_IP, SAFI_UNICAST);
/* Delete ipv6 default route and withdraw from peers */
if (evpn_default_originate_set(bgp_vrf, AFI_IP6, SAFI_UNICAST))
bgp_evpn_install_uninstall_default_route(bgp_vrf, AFI_IP6,
SAFI_UNICAST, false);
/* delete all ipv6 routes and withdraw from peers */
if (advertise_type5_routes(bgp_vrf, AFI_IP6))
bgp_evpn_withdraw_type5_routes(bgp_vrf, AFI_IP6, SAFI_UNICAST);
}
/*
* update and advertise all ipv4 and ipv6 routes in thr vrf table as type-5
* routes
*/
void update_advertise_vrf_routes(struct bgp *bgp_vrf)
{
struct bgp *bgp_evpn = NULL; /* EVPN bgp instance */
bgp_evpn = bgp_get_evpn();
if (!bgp_evpn)
return;
/* update all ipv4 routes */
if (advertise_type5_routes(bgp_vrf, AFI_IP))
bgp_evpn_advertise_type5_routes(bgp_vrf, AFI_IP, SAFI_UNICAST);
/* update ipv4 default route and withdraw from peers */
if (evpn_default_originate_set(bgp_vrf, AFI_IP, SAFI_UNICAST))
bgp_evpn_install_uninstall_default_route(bgp_vrf, AFI_IP,
SAFI_UNICAST, true);
/* update all ipv6 routes */
if (advertise_type5_routes(bgp_vrf, AFI_IP6))
bgp_evpn_advertise_type5_routes(bgp_vrf, AFI_IP6, SAFI_UNICAST);
/* update ipv6 default route and withdraw from peers */
if (evpn_default_originate_set(bgp_vrf, AFI_IP6, SAFI_UNICAST))
bgp_evpn_install_uninstall_default_route(bgp_vrf, AFI_IP6,
SAFI_UNICAST, true);
}
/*
* update and advertise local routes for a VRF as type-5 routes.
* This is invoked upon RD change for a VRF. Note taht the processing is only
* done in the global route table using the routes which already exist in the
* VRF routing table
*/
static void update_router_id_vrf(struct bgp *bgp_vrf)
{
/* skip if the RD is configured */
if (is_vrf_rd_configured(bgp_vrf))
return;
/* derive the RD for the VRF based on new router-id */
bgp_evpn_derive_auto_rd_for_vrf(bgp_vrf);
/* update advertise ipv4|ipv6 routes as type-5 routes */
update_advertise_vrf_routes(bgp_vrf);
}
/*
* Delete and withdraw all type-5 routes for the RD corresponding to VRF.
* This is invoked upon VRF RD change. The processing is done only from global
* table.
*/
static void withdraw_router_id_vrf(struct bgp *bgp_vrf)
{
/* skip if the RD is configured */
if (is_vrf_rd_configured(bgp_vrf))
return;
/* delete/withdraw ipv4|ipv6 routes as type-5 routes */
delete_withdraw_vrf_routes(bgp_vrf);
}
/*
* Update and advertise local routes for a VNI. Invoked upon router-id
* change. Note that the processing is done only on the global route table
* using routes that already exist in the per-VNI table.
*/
static int update_advertise_vni_routes(struct bgp *bgp, struct bgpevpn *vpn)
{
struct prefix_evpn p;
struct bgp_dest *dest, *global_dest;
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);
dest = bgp_node_lookup(vpn->route_table, (struct prefix *)&p);
if (!dest) /* unexpected */
return 0;
for (pi = bgp_dest_get_bgp_path_info(dest); pi; pi = pi->next)
if (pi->peer == bgp->peer_self &&
pi->type == ZEBRA_ROUTE_BGP
&& pi->sub_type == BGP_ROUTE_STATIC)
break;
if (!pi) {
bgp_dest_unlock_node(dest);
return 0;
}
attr = pi->attr;
global_dest = bgp_global_evpn_node_get(bgp->rib[afi][safi],
afi, safi, &p, &vpn->prd);
update_evpn_route_entry(bgp, vpn, afi, safi, global_dest, attr,
1, &pi, 0, mac_mobility_seqnum(attr),
false /* setup_sync */, NULL /* old_is_sync */);
/* Schedule for processing and unlock node. */
bgp_process(bgp, global_dest, afi, safi);
bgp_dest_unlock_node(global_dest);
}
/* Now, walk this VNI's route table and use the route and its attribute
* to create and schedule route in global table.
*/
for (dest = bgp_table_top(vpn->route_table); dest;
dest = bgp_route_next(dest)) {
const struct prefix_evpn *evp =
(const struct prefix_evpn *)bgp_dest_get_prefix(dest);
/*
* We have already processed type-3 routes.
* Process only type-1 and type-2 routes here.
*/
if (evp->prefix.route_type != BGP_EVPN_MAC_IP_ROUTE
&& evp->prefix.route_type != BGP_EVPN_AD_ROUTE)
continue;
for (pi = bgp_dest_get_bgp_path_info(dest); 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_dest = bgp_global_evpn_node_get(bgp->rib[afi][safi], afi, safi,
evp, &vpn->prd);
assert(global_dest);
if (evp->prefix.route_type == BGP_EVPN_MAC_IP_ROUTE) {
/* Type-2 route */
update_evpn_route_entry(
bgp, vpn, afi, safi, global_dest, attr, 1,
&global_pi, 0, mac_mobility_seqnum(attr),
false /* setup_sync */, NULL /* old_is_sync */);
} else {
/* Type-1 route */
struct bgp_evpn_es *es;
int route_changed = 0;
es = bgp_evpn_es_find(&evp->prefix.ead_addr.esi);
bgp_evpn_mh_route_update(bgp, es, vpn, afi, safi,
global_dest, attr, &global_pi,
&route_changed);
}
/* Schedule for processing and unlock node. */
bgp_process(bgp, global_dest, afi, safi);
bgp_dest_unlock_node(global_dest);
}
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)
{
struct prefix_evpn p;
struct bgp_dest *global_dest;
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.
*/
delete_global_type2_routes(bgp, vpn);
/* Remove type-3 route for this VNI from global table. */
build_evpn_type3_prefix(&p, vpn->originator_ip);
global_dest = bgp_global_evpn_node_lookup(bgp->rib[afi][safi], afi, safi,
(const struct prefix_evpn *)&p, &vpn->prd);
if (global_dest) {
/* Delete route entry in the global EVPN table. */
delete_evpn_route_entry(bgp, afi, safi, global_dest, &pi);
/* Schedule for processing - withdraws to peers happen from
* this table.
*/
if (pi)
bgp_process(bgp, global_dest, afi, safi);
bgp_dest_unlock_node(global_dest);
}
delete_global_ead_evi_routes(bgp, vpn);
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, NULL))
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;
/* holds the VNI(s) as in packet */
mpls_label_t label[BGP_MAX_LABELS] = {};
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;
}
struct stream *pkt = stream_new(psize);
stream_put(pkt, pfx, psize);
/* Make prefix_rd */
prd.family = AF_UNSPEC;
prd.prefixlen = 64;
STREAM_GET(&prd.val, pkt, 8);
/* Make EVPN prefix. */
p.family = AF_EVPN;
p.prefixlen = EVPN_ROUTE_PREFIXLEN;
p.prefix.route_type = BGP_EVPN_MAC_IP_ROUTE;
/* Copy Ethernet Seg Identifier */
if (attr) {
STREAM_GET(&attr->esi, pkt, sizeof(esi_t));
if (bgp_evpn_is_esi_local_and_non_bypass(&attr->esi))
attr->es_flags |= ATTR_ES_IS_LOCAL;
else
attr->es_flags &= ~ATTR_ES_IS_LOCAL;
} else {
STREAM_FORWARD_GETP(pkt, sizeof(esi_t));
}
/* Copy Ethernet Tag */
STREAM_GET(&eth_tag, pkt, 4);
p.prefix.macip_addr.eth_tag = ntohl(eth_tag);
/* Get the MAC Addr len */
STREAM_GETC(pkt, macaddr_len);
/* Get the MAC Addr */
if (macaddr_len == (ETH_ALEN * 8)) {
STREAM_GET(&p.prefix.macip_addr.mac.octet, pkt, 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);
goto fail;
}
/* Get the IP. */
STREAM_GETC(pkt, ipaddr_len);
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);
goto fail;
}
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;
STREAM_GET(&p.prefix.macip_addr.ip.ip.addr, pkt, ipaddr_len);
}
/* Get the VNI(s). Stored as bytes here. */
STREAM_GET(&label[0], pkt, BGP_LABEL_BYTES);
num_labels++;
/* Do we have a second VNI? */
if (STREAM_READABLE(pkt)) {
num_labels++;
STREAM_GET(&label[1], pkt, BGP_LABEL_BYTES);
}
/* 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);
goto done;
fail:
stream_failure:
flog_err(EC_BGP_EVPN_ROUTE_INVALID,
"%u:%s - Rx EVPN Type-2 NLRI - corrupt, discarding",
peer->bgp->vrf_id, peer->host);
ret = -1;
done:
stream_free(pkt);
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))) {
enum pta_type pmsi_tnl_type = bgp_attr_get_pmsi_tnl_type(attr);
if (pmsi_tnl_type != PMSI_TNLTYPE_INGR_REPL
&& 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, 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(p));
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-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;
bool is_valid_update = true;
/* 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(p));
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 overlay index */
if (attr)
memcpy(&evpn.eth_s_id, pfx, sizeof(esi_t));
pfx += ESI_BYTES;
/* 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;
SET_IPADDR_V4(&evpn.gw_ip);
memcpy(&evpn.gw_ip.ipaddr_v4, pfx, 4);
pfx += 4;
} else {
SET_IPADDR_V6(&p.prefix.prefix_addr.ip);
memcpy(&p.prefix.prefix_addr.ip.ipaddr_v6, pfx,
IPV6_MAX_BYTELEN);
pfx += IPV6_MAX_BYTELEN;
SET_IPADDR_V6(&evpn.gw_ip);
memcpy(&evpn.gw_ip.ipaddr_v6, pfx, IPV6_MAX_BYTELEN);
pfx += IPV6_MAX_BYTELEN;
}
/* 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
*/
/*
* An update containing a non-zero gateway IP and a non-zero ESI
* at the same time is should be treated as withdraw
*/
if (bgp_evpn_is_esi_valid(&evpn.eth_s_id) &&
!ipaddr_is_zero(&evpn.gw_ip)) {
flog_err(EC_BGP_EVPN_ROUTE_INVALID,
"%s - Rx EVPN Type-5 ESI and gateway-IP both non-zero.",
peer->host);
is_valid_update = false;
} else if (bgp_evpn_is_esi_valid(&evpn.eth_s_id))
evpn.type = OVERLAY_INDEX_ESI;
else if (!ipaddr_is_zero(&evpn.gw_ip))
evpn.type = OVERLAY_INDEX_GATEWAY_IP;
if (attr) {
if (is_zero_mac(&attr->rmac) &&
!bgp_evpn_is_esi_valid(&evpn.eth_s_id) &&
ipaddr_is_zero(&evpn.gw_ip) && label == 0) {
flog_err(EC_BGP_EVPN_ROUTE_INVALID,
"%s - Rx EVPN Type-5 ESI, gateway-IP, RMAC and label all zero",
peer->host);
is_valid_update = false;
}
if (is_mcast_mac(&attr->rmac) || is_bcast_mac(&attr->rmac))
is_valid_update = false;
}
/* Process the route. */
if (attr && is_valid_update)
ret = bgp_update(peer, (struct prefix *)&p, addpath_id, attr,
afi, safi, ZEBRA_ROUTE_BGP, BGP_ROUTE_NORMAL,
&prd, &label, 1, 0, &evpn);
else {
if (!is_valid_update) {
char attr_str[BUFSIZ] = {0};
bgp_dump_attr(attr, attr_str, BUFSIZ);
zlog_warn(
"Invalid update from peer %s vrf %u prefix %pFX attr %s - treat as withdraw",
peer->hostname, peer->bgp->vrf_id, &p,
attr_str);
}
ret = bgp_withdraw(peer, (struct prefix *)&p, addpath_id, attr,
afi, safi, ZEBRA_ROUTE_BGP, BGP_ROUTE_NORMAL,
&prd, &label, 1, &evpn);
}
return ret;
}
static void evpn_mpattr_encode_type5(struct stream *s, const struct prefix *p,
const struct prefix_rd *prd,
mpls_label_t *label, uint32_t num_labels,
struct attr *attr)
{
int len;
char temp[16];
const struct evpn_addr *p_evpn_p;
memset(&temp, 0, sizeof(temp));
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 && attr->evpn_overlay.type == OVERLAY_INDEX_ESI)
stream_put(s, &attr->esi, sizeof(esi_t));
else
stream_put(s, 0, sizeof(esi_t));
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 && attr->evpn_overlay.type == OVERLAY_INDEX_GATEWAY_IP) {
const struct bgp_route_evpn *evpn_overlay =
bgp_attr_get_evpn_overlay(attr);
if (IS_IPADDR_V4(&p_evpn_p->prefix_addr.ip))
stream_put_ipv4(s,
evpn_overlay->gw_ip.ipaddr_v4.s_addr);
else
stream_put(s, &(evpn_overlay->gw_ip.ipaddr_v6), 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, true);
/* 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,
true);
}
/*
* Derive AUTO export RT for BGP VRF - L3VNI
*/
static void evpn_auto_rt_export_add_for_vrf(struct bgp *bgp_vrf)
{
form_auto_rt(bgp_vrf, bgp_vrf->l3vni, bgp_vrf->vrf_export_rtl, true);
}
/*
* 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,
true);
}
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);
}
}
/*
* Handle autort change for L3VNI.
*/
static void update_autort_l3vni(struct bgp *bgp)
{
if ((CHECK_FLAG(bgp->vrf_flags, BGP_VRF_IMPORT_RT_CFGD))
&& (CHECK_FLAG(bgp->vrf_flags, BGP_VRF_EXPORT_RT_CFGD)))
return;
if (!CHECK_FLAG(bgp->vrf_flags, BGP_VRF_IMPORT_RT_CFGD)) {
if (is_l3vni_live(bgp))
uninstall_routes_for_vrf(bgp);
/* Cleanup the RT to VRF mapping */
bgp_evpn_unmap_vrf_from_its_rts(bgp);
/* Remove auto generated RT */
evpn_auto_rt_import_delete_for_vrf(bgp);
list_delete_all_node(bgp->vrf_import_rtl);
/* Map auto derive or configured RTs */
evpn_auto_rt_import_add_for_vrf(bgp);
}
if (!CHECK_FLAG(bgp->vrf_flags, BGP_VRF_EXPORT_RT_CFGD)) {
list_delete_all_node(bgp->vrf_export_rtl);
evpn_auto_rt_export_delete_for_vrf(bgp);
evpn_auto_rt_export_add_for_vrf(bgp);
if (is_l3vni_live(bgp))
bgp_evpn_map_vrf_to_its_rts(bgp);
}
if (!is_l3vni_live(bgp))
return;
/* advertise type-5 routes if needed */
update_advertise_vrf_routes(bgp);
/* install all remote routes belonging to this l3vni
* into corresponding vrf
*/
install_routes_for_vrf(bgp);
}
/*
* Public functions.
*/
/* withdraw type-5 route corresponding to ip prefix */
void bgp_evpn_withdraw_type5_route(struct bgp *bgp_vrf, const struct prefix *p,
afi_t afi, safi_t safi)
{
int ret = 0;
struct prefix_evpn evp;
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 %pFX in vrf %s",
bgp_vrf->vrf_id, p, 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_dest *dest = NULL;
struct bgp_path_info *pi;
table = bgp_vrf->rib[afi][safi];
for (dest = bgp_table_top(table); dest; dest = bgp_route_next(dest)) {
/* 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_dest_get_bgp_path_info(dest); pi; pi = pi->next) {
if (CHECK_FLAG(pi->flags, BGP_PATH_SELECTED)
&& is_route_injectable_into_evpn(pi)) {
bgp_evpn_withdraw_type5_route(
bgp_vrf, bgp_dest_get_prefix(dest), 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(ip_prefix));
ip_prefix.family = afi2family(afi);
if (add) {
bgp_evpn_advertise_type5_route(bgp_vrf, &ip_prefix,
NULL, afi, safi);
} else {
bgp_evpn_withdraw_type5_route(bgp_vrf, &ip_prefix,
afi, safi);
}
}
/*
* Advertise IP prefix as type-5 route. The afi/safi and src_attr passed
* to this function correspond to those of the source IP prefix (best
* path in the case of the attr. In the case of a local prefix (when we
* are advertising local subnets), the src_attr will be NULL.
*/
void bgp_evpn_advertise_type5_route(struct bgp *bgp_vrf, const struct prefix *p,
struct attr *src_attr, afi_t afi,
safi_t safi)
{
int ret = 0;
struct prefix_evpn evp;
build_type5_prefix_from_ip_prefix(&evp, p);
ret = update_evpn_type5_route(bgp_vrf, &evp, src_attr, afi, safi);
if (ret)
flog_err(EC_BGP_EVPN_ROUTE_CREATE,
"%u: Failed to create type-5 route for prefix %pFX",
bgp_vrf->vrf_id, p);
}
/* 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_dest *dest = NULL;
struct bgp_path_info *pi;
table = bgp_vrf->rib[afi][safi];
for (dest = bgp_table_top(table); dest; dest = bgp_route_next(dest)) {
/* 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_dest_get_bgp_path_info(dest); pi; pi = pi->next) {
if (CHECK_FLAG(pi->flags, BGP_PATH_SELECTED)
&& is_route_injectable_into_evpn(pi)) {
/* apply the route-map */
if (bgp_vrf->adv_cmd_rmap[afi][safi].map) {
route_map_result_t ret;
struct bgp_path_info tmp_pi;
struct bgp_path_info_extra tmp_pie;
struct attr tmp_attr;
tmp_attr = *pi->attr;
/* Fill temp path_info */
prep_for_rmap_apply(&tmp_pi, &tmp_pie,
dest, pi, pi->peer,
&tmp_attr);
RESET_FLAG(tmp_attr.rmap_change_flags);
ret = route_map_apply(
bgp_vrf->adv_cmd_rmap[afi][safi]
.map,
bgp_dest_get_prefix(dest),
&tmp_pi);
if (ret == RMAP_DENYMATCH) {
bgp_attr_flush(&tmp_attr);
continue;
}
bgp_evpn_advertise_type5_route(
bgp_vrf,
bgp_dest_get_prefix(dest),
&tmp_attr, afi, safi);
} else
bgp_evpn_advertise_type5_route(
bgp_vrf,
bgp_dest_get_prefix(dest),
pi->attr, afi, safi);
break;
}
}
}
}
static void rt_list_remove_node(struct list *rt_list,
struct ecommunity *ecomdel, bool is_l3)
{
struct listnode *node = NULL, *nnode = NULL, *node_to_del = NULL;
struct vrf_route_target *l3rt = NULL;
struct ecommunity *ecom = NULL;
if (is_l3) {
for (ALL_LIST_ELEMENTS(rt_list, node, nnode, l3rt)) {
if (ecommunity_match(l3rt->ecom, ecomdel)) {
evpn_vrf_rt_del(l3rt);
node_to_del = node;
break;
}
}
} else {
for (ALL_LIST_ELEMENTS(rt_list, node, nnode, ecom)) {
if (ecommunity_match(ecom, ecomdel)) {
ecommunity_free(&ecom);
node_to_del = node;
break;
}
}
}
if (node_to_del)
list_delete_node(rt_list, node_to_del);
}
void evpn_rt_delete_auto(struct bgp *bgp, vni_t vni, struct list *rtl,
bool is_l3)
{
struct ecommunity *ecom_auto;
struct ecommunity_val eval;
if (bgp->advertise_autort_rfc8365)
vni |= EVPN_AUTORT_VXLAN;
encode_route_target_as((bgp->as & 0xFFFF), vni, &eval);
ecom_auto = ecommunity_new();
ecommunity_add_val(ecom_auto, &eval, false, false);
rt_list_remove_node(rtl, ecom_auto, is_l3);
ecommunity_free(&ecom_auto);
}
static void evpn_vrf_rt_routes_map(struct bgp *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);
}
}
static void evpn_vrf_rt_routes_unmap(struct bgp *bgp_vrf)
{
/* 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);
}
static bool rt_list_has_cfgd_rt(struct list *rt_list)
{
struct listnode *node = NULL, *nnode = NULL;
struct vrf_route_target *l3rt = NULL;
for (ALL_LIST_ELEMENTS(rt_list, node, nnode, l3rt)) {
if (!CHECK_FLAG(l3rt->flags, BGP_VRF_RT_AUTO))
return true;
}
return false;
}
static void unconfigure_import_rt_for_vrf_fini(struct bgp *bgp_vrf)
{
if (!bgp_vrf->vrf_import_rtl)
return; /* this should never fail */
if (!is_l3vni_live(bgp_vrf))
return; /* Nothing to do if no vni */
/* fall back to auto-generated RT if this was the last RT */
if (list_isempty(bgp_vrf->vrf_import_rtl))
evpn_auto_rt_import_add_for_vrf(bgp_vrf);
}
static void unconfigure_export_rt_for_vrf_fini(struct bgp *bgp_vrf)
{
if (!bgp_vrf->vrf_export_rtl)
return; /* this should never fail */
if (!is_l3vni_live(bgp_vrf))
return; /* Nothing to do if no vni */
/* fall back to auto-generated RT if this was the last RT */
if (list_isempty(bgp_vrf->vrf_export_rtl))
evpn_auto_rt_export_add_for_vrf(bgp_vrf);
bgp_evpn_handle_export_rt_change_for_vrf(bgp_vrf);
}
void bgp_evpn_configure_import_rt_for_vrf(struct bgp *bgp_vrf,
struct ecommunity *ecomadd,
bool is_wildcard)
{
struct vrf_route_target *newrt;
newrt = evpn_vrf_rt_new(ecomadd);
if (is_wildcard)
SET_FLAG(newrt->flags, BGP_VRF_RT_WILD);
evpn_vrf_rt_routes_unmap(bgp_vrf);
/* Remove auto generated RT if not configured */
if (!CHECK_FLAG(bgp_vrf->vrf_flags, BGP_VRF_IMPORT_AUTO_RT_CFGD))
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, newrt);
SET_FLAG(bgp_vrf->vrf_flags, BGP_VRF_IMPORT_RT_CFGD);
evpn_vrf_rt_routes_map(bgp_vrf);
}
void bgp_evpn_configure_import_auto_rt_for_vrf(struct bgp *bgp_vrf)
{
if (CHECK_FLAG(bgp_vrf->vrf_flags, BGP_VRF_IMPORT_AUTO_RT_CFGD))
return; /* Already configured */
SET_FLAG(bgp_vrf->vrf_flags, BGP_VRF_IMPORT_AUTO_RT_CFGD);
if (!is_l3vni_live(bgp_vrf))
return; /* Wait for VNI before adding rts */
evpn_vrf_rt_routes_unmap(bgp_vrf);
evpn_auto_rt_import_add_for_vrf(bgp_vrf);
evpn_vrf_rt_routes_map(bgp_vrf);
}
void bgp_evpn_unconfigure_import_rt_for_vrf(struct bgp *bgp_vrf,
struct ecommunity *ecomdel)
{
if (!CHECK_FLAG(bgp_vrf->vrf_flags, BGP_VRF_IMPORT_RT_CFGD))
return; /* Already un-configured */
evpn_vrf_rt_routes_unmap(bgp_vrf);
/* Remove rt */
rt_list_remove_node(bgp_vrf->vrf_import_rtl, ecomdel, true);
if (!rt_list_has_cfgd_rt(bgp_vrf->vrf_import_rtl))
UNSET_FLAG(bgp_vrf->vrf_flags, BGP_VRF_IMPORT_RT_CFGD);
unconfigure_import_rt_for_vrf_fini(bgp_vrf);
evpn_vrf_rt_routes_map(bgp_vrf);
}
void bgp_evpn_unconfigure_import_auto_rt_for_vrf(struct bgp *bgp_vrf)
{
if (!CHECK_FLAG(bgp_vrf->vrf_flags, BGP_VRF_IMPORT_AUTO_RT_CFGD))
return; /* Already un-configured */
evpn_vrf_rt_routes_unmap(bgp_vrf);
/* remove auto-generated RT */
evpn_auto_rt_import_delete_for_vrf(bgp_vrf);
UNSET_FLAG(bgp_vrf->vrf_flags, BGP_VRF_IMPORT_AUTO_RT_CFGD);
unconfigure_import_rt_for_vrf_fini(bgp_vrf);
evpn_vrf_rt_routes_map(bgp_vrf);
}
void bgp_evpn_configure_export_rt_for_vrf(struct bgp *bgp_vrf,
struct ecommunity *ecomadd)
{
struct vrf_route_target *newrt;
newrt = evpn_vrf_rt_new(ecomadd);
/* Remove auto generated RT if not configured */
if (!CHECK_FLAG(bgp_vrf->vrf_flags, BGP_VRF_EXPORT_AUTO_RT_CFGD))
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, newrt);
SET_FLAG(bgp_vrf->vrf_flags, BGP_VRF_EXPORT_RT_CFGD);
if (is_l3vni_live(bgp_vrf))
bgp_evpn_handle_export_rt_change_for_vrf(bgp_vrf);
}
void bgp_evpn_configure_export_auto_rt_for_vrf(struct bgp *bgp_vrf)
{
if (CHECK_FLAG(bgp_vrf->vrf_flags, BGP_VRF_EXPORT_AUTO_RT_CFGD))
return; /* Already configured */
SET_FLAG(bgp_vrf->vrf_flags, BGP_VRF_EXPORT_AUTO_RT_CFGD);
if (!is_l3vni_live(bgp_vrf))
return; /* Wait for VNI before adding rts */
evpn_auto_rt_export_add_for_vrf(bgp_vrf);
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)
{
if (!CHECK_FLAG(bgp_vrf->vrf_flags, BGP_VRF_EXPORT_RT_CFGD))
return; /* Already un-configured */
/* Remove rt */
rt_list_remove_node(bgp_vrf->vrf_export_rtl, ecomdel, true);
if (!rt_list_has_cfgd_rt(bgp_vrf->vrf_export_rtl))
UNSET_FLAG(bgp_vrf->vrf_flags, BGP_VRF_EXPORT_RT_CFGD);
unconfigure_export_rt_for_vrf_fini(bgp_vrf);
}
void bgp_evpn_unconfigure_export_auto_rt_for_vrf(struct bgp *bgp_vrf)
{
if (!CHECK_FLAG(bgp_vrf->vrf_flags, BGP_VRF_EXPORT_AUTO_RT_CFGD))
return; /* Already un-configured */
/* remove auto-generated RT */
evpn_auto_rt_export_delete_for_vrf(bgp_vrf);
UNSET_FLAG(bgp_vrf->vrf_flags, BGP_VRF_EXPORT_AUTO_RT_CFGD);
unconfigure_export_rt_for_vrf_fini(bgp_vrf);
}
/*
* Handle change to BGP router id. This is invoked twice by the change
* handler, first before the router id has been changed and then after
* the router id has been changed. The first invocation will result in
* local routes for all VNIs/VRF being deleted and withdrawn and the next
* will result in the routes being re-advertised.
*/
void bgp_evpn_handle_router_id_update(struct bgp *bgp, int withdraw)
{
struct listnode *node;
struct bgp *bgp_vrf;
if (withdraw) {
/* delete and withdraw all the type-5 routes
stored in the global table for this vrf
*/
withdraw_router_id_vrf(bgp);
/* delete all the VNI routes (type-2/type-3) routes for all the
* L2-VNIs
*/
hash_iterate(bgp->vnihash,
(void (*)(struct hash_bucket *,
void *))withdraw_router_id_vni,
bgp);
if (bgp->inst_type == BGP_INSTANCE_TYPE_DEFAULT) {
for (ALL_LIST_ELEMENTS_RO(bm->bgp, node, bgp_vrf)) {
if (bgp_vrf->evpn_info->advertise_pip &&
(bgp_vrf->evpn_info->pip_ip_static.s_addr
== INADDR_ANY))
bgp_vrf->evpn_info->pip_ip.s_addr
= INADDR_ANY;
}
}
} else {
/* Assign new default instance router-id */
if (bgp->inst_type == BGP_INSTANCE_TYPE_DEFAULT) {
for (ALL_LIST_ELEMENTS_RO(bm->bgp, node, bgp_vrf)) {
if (bgp_vrf->evpn_info->advertise_pip &&
(bgp_vrf->evpn_info->pip_ip_static.s_addr
== INADDR_ANY)) {
bgp_vrf->evpn_info->pip_ip =
bgp->router_id;
/* advertise type-5 routes with
* new nexthop
*/
update_advertise_vrf_routes(bgp_vrf);
}
}
}
/* advertise all routes in the vrf as type-5 routes with the new
* RD
*/
update_router_id_vrf(bgp);
/* advertise all the VNI routes (type-2/type-3) routes with the
* new RD
*/
hash_iterate(bgp->vnihash,
(void (*)(struct hash_bucket *,
void *))update_router_id_vni,
bgp);
}
}
/*
* Handle change to auto-RT algorithm - update and advertise local routes.
*/
void bgp_evpn_handle_autort_change(struct bgp *bgp)
{
hash_iterate(bgp->vnihash,
(void (*)(struct hash_bucket *,
void*))update_autort_vni,
bgp);
if (bgp->l3vni)
update_autort_l3vni(bgp);
}
/*
* Handle change to export RT - update and advertise local routes.
*/
int bgp_evpn_handle_export_rt_change(struct bgp *bgp, struct bgpevpn *vpn)
{
return update_routes_for_vni(bgp, vpn);
}
void bgp_evpn_handle_vrf_rd_change(struct bgp *bgp_vrf, int withdraw)
{
if (withdraw)
delete_withdraw_vrf_routes(bgp_vrf);
else
update_advertise_vrf_routes(bgp_vrf);
}
/*
* Handle change to RD. This is invoked twice by the change handler,
* first before the RD has been changed and then after the RD has
* been changed. The first invocation will result in local routes
* of this VNI being deleted and withdrawn and the next will result
* in the routes being re-advertised.
*/
void bgp_evpn_handle_rd_change(struct bgp *bgp, struct bgpevpn *vpn,
int withdraw)
{
if (withdraw)
delete_withdraw_vni_routes(bgp, vpn);
else
update_advertise_vni_routes(bgp, vpn);
}
/*
* Install routes for this VNI. Invoked upon change to Import RT.
*/
int bgp_evpn_install_routes(struct bgp *bgp, struct bgpevpn *vpn)
{
return install_routes_for_vni(bgp, vpn);
}
/*
* Uninstall all routes installed for this VNI. Invoked upon change
* to Import RT.
*/
int bgp_evpn_uninstall_routes(struct bgp *bgp, struct bgpevpn *vpn)
{
return uninstall_routes_for_vni(bgp, vpn);
}
/*
* TODO: Hardcoded for a maximum of 2 VNIs right now
*/
char *bgp_evpn_label2str(mpls_label_t *label, uint32_t num_labels, char *buf,
int len)
{
vni_t vni1, vni2;
vni1 = label2vni(label);
if (num_labels == 2) {
vni2 = label2vni(label + 1);
snprintf(buf, len, "%u/%u", vni1, vni2);
} else
snprintf(buf, len, "%u", vni1);
return buf;
}
/*
* Function to convert evpn route to json format.
* NOTE: We don't use prefix2str as the output here is a bit different.
*/
void bgp_evpn_route2json(const struct prefix_evpn *p, json_object *json)
{
char buf1[ETHER_ADDR_STRLEN];
char buf2[PREFIX2STR_BUFFER];
uint8_t family;
uint8_t prefixlen;
if (!json)
return;
json_object_int_add(json, "routeType", p->prefix.route_type);
switch (p->prefix.route_type) {
case BGP_EVPN_MAC_IP_ROUTE:
json_object_int_add(json, "ethTag",
p->prefix.macip_addr.eth_tag);
json_object_int_add(json, "macLen", 8 * ETH_ALEN);
json_object_string_add(json, "mac",
prefix_mac2str(&p->prefix.macip_addr.mac, buf1,
sizeof(buf1)));
if (!is_evpn_prefix_ipaddr_none(p)) {
family = is_evpn_prefix_ipaddr_v4(p) ? AF_INET :
AF_INET6;
prefixlen = (family == AF_INET) ?
IPV4_MAX_BITLEN : IPV6_MAX_BITLEN;
inet_ntop(family, &p->prefix.macip_addr.ip.ip.addr,
buf2, PREFIX2STR_BUFFER);
json_object_int_add(json, "ipLen", prefixlen);
json_object_string_add(json, "ip", buf2);
}
break;
case BGP_EVPN_IMET_ROUTE:
json_object_int_add(json, "ethTag",
p->prefix.imet_addr.eth_tag);
family = is_evpn_prefix_ipaddr_v4(p) ? AF_INET : AF_INET6;
prefixlen = (family == AF_INET) ? IPV4_MAX_BITLEN :
IPV6_MAX_BITLEN;
inet_ntop(family, &p->prefix.imet_addr.ip.ip.addr, buf2,
PREFIX2STR_BUFFER);
json_object_int_add(json, "ipLen", prefixlen);
json_object_string_add(json, "ip", buf2);
break;
case BGP_EVPN_IP_PREFIX_ROUTE:
json_object_int_add(json, "ethTag",
p->prefix.prefix_addr.eth_tag);
family = is_evpn_prefix_ipaddr_v4(p) ? AF_INET : AF_INET6;
inet_ntop(family, &p->prefix.prefix_addr.ip.ip.addr,
buf2, sizeof(buf2));
json_object_int_add(json, "ipLen",
p->prefix.prefix_addr.ip_prefix_length);
json_object_string_add(json, "ip", buf2);
break;
default:
break;
}
}
/*
* Encode EVPN prefix in Update (MP_REACH)
*/
void bgp_evpn_encode_prefix(struct stream *s, const struct prefix *p,
const struct prefix_rd *prd, mpls_label_t *label,
uint32_t num_labels, struct attr *attr,
bool addpath_capable, uint32_t addpath_tx_id)
{
struct prefix_evpn *evp = (struct prefix_evpn *)p;
int len, ipa_len = 0;
if (addpath_capable)
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->esi, ESI_BYTES);
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_AD_ROUTE:
/* RD, ESI, EthTag, 1 VNI */
len = RD_BYTES + ESI_BYTES + EVPN_ETH_TAG_BYTES + BGP_LABEL_BYTES;
stream_putc(s, len);
stream_put(s, prd->val, RD_BYTES); /* RD */
stream_put(s, evp->prefix.ead_addr.esi.val, ESI_BYTES); /* ESI */
stream_putl(s, evp->prefix.ead_addr.eth_tag); /* Ethernet Tag */
stream_put(s, label, BGP_LABEL_BYTES);
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;
bool addpath_capable;
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_capable = bgp_addpath_encode_rx(peer, afi, safi);
for (; pnt < lim; pnt += psize) {
/* Clear prefix structure. */
memset(&p, 0, sizeof(p));
/* Deal with path-id if AddPath is supported. */
if (addpath_capable) {
/* When packet overflow occurs return immediately. */
if (pnt + BGP_ADDPATH_ID_LEN > lim)
return BGP_NLRI_PARSE_ERROR_PACKET_OVERFLOW;
memcpy(&addpath_id, pnt, BGP_ADDPATH_ID_LEN);
addpath_id = ntohl(addpath_id);
pnt += BGP_ADDPATH_ID_LEN;
}
/* All EVPN NLRI types start with type and length. */
if (pnt + 2 > lim)
return BGP_NLRI_PARSE_ERROR_EVPN_MISSING_TYPE;
rtype = *pnt++;
psize = *pnt++;
/* When packet overflow occur return immediately. */
if (pnt + psize > lim)
return BGP_NLRI_PARSE_ERROR_PACKET_OVERFLOW;
switch (rtype) {
case BGP_EVPN_MAC_IP_ROUTE:
if (process_type2_route(peer, afi, safi,
withdraw ? NULL : attr, pnt,
psize, addpath_id)) {
flog_err(
EC_BGP_EVPN_FAIL,
"%u:%s - Error in processing EVPN type-2 NLRI size %d",
peer->bgp->vrf_id, peer->host, psize);
return BGP_NLRI_PARSE_ERROR_EVPN_TYPE2_SIZE;
}
break;
case BGP_EVPN_IMET_ROUTE:
if (process_type3_route(peer, afi, safi,
withdraw ? NULL : attr, pnt,
psize, addpath_id)) {
flog_err(
EC_BGP_PKT_PROCESS,
"%u:%s - Error in processing EVPN type-3 NLRI size %d",
peer->bgp->vrf_id, peer->host, psize);
return BGP_NLRI_PARSE_ERROR_EVPN_TYPE3_SIZE;
}
break;
case BGP_EVPN_ES_ROUTE:
if (bgp_evpn_type4_route_process(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_AD_ROUTE:
if (bgp_evpn_type1_route_process(peer, afi, safi,
withdraw ? NULL : attr, pnt,
psize, addpath_id)) {
flog_err(
EC_BGP_PKT_PROCESS,
"%u:%s - Error in processing EVPN type-1 NLRI size %d",
peer->bgp->vrf_id, peer->host, psize);
return BGP_NLRI_PARSE_ERROR_EVPN_TYPE1_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_vrf: specific bgp vrf instance on which RT is configured
*/
void bgp_evpn_map_vrf_to_its_rts(struct bgp *bgp_vrf)
{
struct listnode *node, *nnode;
struct vrf_route_target *l3rt;
for (ALL_LIST_ELEMENTS(bgp_vrf->vrf_import_rtl, node, nnode, l3rt))
map_vrf_to_rt(bgp_vrf, l3rt);
}
/*
* 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)
{
struct listnode *node, *nnode;
struct vrf_route_target *l3rt;
for (ALL_LIST_ELEMENTS(bgp_vrf->vrf_import_rtl, node, nnode, l3rt))
unmap_vrf_from_rt(bgp_vrf, l3rt);
}
/*
* 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)
{
uint32_t 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)
{
uint32_t 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, false);
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, false);
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[BGP_EVPN_PREFIX_RD_LEN];
vpn->prd.family = AF_UNSPEC;
vpn->prd.prefixlen = 64;
snprintfrr(buf, sizeof(buf), "%pI4:%hu", &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(tmp));
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,
ifindex_t svi_ifindex)
{
struct bgpevpn *vpn;
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;
vpn->svi_ifindex = svi_ifindex;
/* Initialize route-target import and export lists */
vpn->import_rtl = list_new();
vpn->import_rtl->cmp =
(int (*)(void *, void *))bgp_evpn_route_target_cmp;
vpn->import_rtl->del = bgp_evpn_xxport_delete_ecomm;
vpn->export_rtl = list_new();
vpn->export_rtl->cmp =
(int (*)(void *, void *))bgp_evpn_route_target_cmp;
vpn->export_rtl->del = bgp_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 */
(void)hash_get(bgp->vnihash, vpn, hash_alloc_intern);
bgp_evpn_remote_ip_hash_init(vpn);
bgp_evpn_link_to_vni_svi_hash(bgp, vpn);
/* add to l2vni list on corresponding vrf */
bgpevpn_link_to_l3vni(vpn);
bgp_evpn_vni_es_init(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)
{
bgp_evpn_remote_ip_hash_destroy(vpn);
bgp_evpn_vni_es_cleanup(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->vni_svi_hash, vpn);
hash_release(bgp->vnihash, vpn);
QOBJ_UNREG(vpn);
XFREE(MTYPE_BGP_EVPN, vpn);
}
static void hash_evpn_free(struct bgpevpn *vpn)
{
XFREE(MTYPE_BGP_EVPN, vpn);
}
/*
* Import evpn route from global table to VNI/VRF/ESI.
*/
int bgp_evpn_import_route(struct bgp *bgp, afi_t afi, safi_t safi,
const struct prefix *p, struct bgp_path_info *pi)
{
return install_uninstall_evpn_route(bgp, afi, safi, p, pi, 1);
}
/*
* Unimport evpn route from VNI/VRF/ESI.
*/
int bgp_evpn_unimport_route(struct bgp *bgp, afi_t afi, safi_t safi,
const struct prefix *p, struct bgp_path_info *pi)
{
return install_uninstall_evpn_route(bgp, afi, safi, p, pi, 0);
}
/* filter routes which have martian next hops */
int bgp_filter_evpn_routes_upon_martian_nh_change(struct bgp *bgp)
{
afi_t afi;
safi_t safi;
struct bgp_dest *rd_dest, *dest;
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_dest = bgp_table_top(bgp->rib[afi][safi]); rd_dest;
rd_dest = bgp_route_next(rd_dest)) {
table = bgp_dest_get_bgp_table_info(rd_dest);
if (!table)
continue;
for (dest = bgp_table_top(table); dest;
dest = bgp_route_next(dest)) {
for (pi = bgp_dest_get_bgp_path_info(dest); 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,
dest)) {
const struct prefix *p =
bgp_dest_get_prefix(dest);
if (bgp_debug_update(pi->peer, p, NULL,
1)) {
char attr_str[BUFSIZ] = {0};
bgp_dump_attr(pi->attr,
attr_str,
sizeof(attr_str));
zlog_debug(
"%u: prefix %pBD with attr %s - DENIED due to martian or self nexthop",
bgp->vrf_id, dest,
attr_str);
}
bgp_evpn_unimport_route(bgp, afi, safi,
p, pi);
bgp_rib_remove(dest, 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_dest *dest;
/* 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 */
dest = bgp_node_lookup(vpn->route_table, (struct prefix *)&p);
if (dest) {
evpn_zebra_reinstall_best_route(bgp, vpn, dest);
bgp_dest_unlock_node(dest);
}
}
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, esi_t *esi)
{
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, esi)) {
flog_err(
EC_BGP_EVPN_ROUTE_CREATE,
"%u:Failed to create Type-2 route, VNI %u %s MAC %pEA IP %pIA (flags: 0x%x)",
bgp->vrf_id, vpn->vni,
CHECK_FLAG(flags, ZEBRA_MACIP_TYPE_STICKY)
? "sticky gateway"
: "",
mac, ip, flags);
return -1;
}
return 0;
}
static void link_l2vni_hash_to_l3vni(struct hash_bucket *bucket,
struct bgp *bgp_vrf)
{
struct bgpevpn *vpn = (struct bgpevpn *)bucket->data;
struct bgp *bgp_evpn = NULL;
bgp_evpn = bgp_get_evpn();
assert(bgp_evpn);
if (vpn->tenant_vrf_id == bgp_vrf->vrf_id)
bgpevpn_link_to_l3vni(vpn);
}
int bgp_evpn_local_l3vni_add(vni_t l3vni, vrf_id_t vrf_id,
struct ethaddr *svi_rmac,
struct ethaddr *vrr_rmac,
struct in_addr originator_ip, int filter,
ifindex_t svi_ifindex,
bool is_anycast_mac)
{
struct bgp *bgp_vrf = NULL; /* bgp VRF instance */
struct bgp *bgp_evpn = NULL; /* EVPN bgp instance */
struct listnode *node = NULL;
struct bgpevpn *vpn = NULL;
as_t as = 0;
/* get the EVPN instance - required to get the AS number for VRF
* auto-creatio
*/
bgp_evpn = bgp_get_evpn();
if (!bgp_evpn) {
flog_err(
EC_BGP_NO_DFLT,
"Cannot process L3VNI %u ADD - EVPN BGP instance not yet created",
l3vni);
return -1;
}
as = bgp_evpn->as;
/* if the BGP vrf instance doesn't exist - create one */
bgp_vrf = bgp_lookup_by_vrf_id(vrf_id);
if (!bgp_vrf) {
int ret = 0;
ret = bgp_get_vty(&bgp_vrf, &as, vrf_id_to_name(vrf_id),
vrf_id == VRF_DEFAULT
? BGP_INSTANCE_TYPE_DEFAULT
: BGP_INSTANCE_TYPE_VRF);
switch (ret) {
case BGP_ERR_AS_MISMATCH:
flog_err(EC_BGP_EVPN_AS_MISMATCH,
"BGP instance is already running; AS is %u",
as);
return -1;
case BGP_ERR_INSTANCE_MISMATCH:
flog_err(EC_BGP_EVPN_INSTANCE_MISMATCH,
"BGP instance type mismatch");
return -1;
}
/* mark as auto created */
SET_FLAG(bgp_vrf->vrf_flags, BGP_VRF_AUTO);
}
/* associate the vrf with l3vni and related parameters */
bgp_vrf->l3vni = l3vni;
bgp_vrf->originator_ip = originator_ip;
bgp_vrf->l3vni_svi_ifindex = svi_ifindex;
bgp_vrf->evpn_info->is_anycast_mac = is_anycast_mac;
/* copy anycast MAC from VRR MAC */
memcpy(&bgp_vrf->rmac, vrr_rmac, ETH_ALEN);
/* copy sys RMAC from SVI MAC */
memcpy(&bgp_vrf->evpn_info->pip_rmac_zebra, svi_rmac, ETH_ALEN);
/* PIP user configured mac is not present use svi mac as sys mac */
if (is_zero_mac(&bgp_vrf->evpn_info->pip_rmac_static))
memcpy(&bgp_vrf->evpn_info->pip_rmac, svi_rmac, ETH_ALEN);
if (bgp_debug_zebra(NULL))
zlog_debug(
"VRF %s vni %u pip %s RMAC %pEA sys RMAC %pEA static RMAC %pEA is_anycast_mac %s",
vrf_id_to_name(bgp_vrf->vrf_id), bgp_vrf->l3vni,
bgp_vrf->evpn_info->advertise_pip ? "enable"
: "disable",
&bgp_vrf->rmac, &bgp_vrf->evpn_info->pip_rmac,
&bgp_vrf->evpn_info->pip_rmac_static,
is_anycast_mac ? "Enable" : "Disable");
/* set the right filter - are we using l3vni only for prefix routes? */
if (filter) {
SET_FLAG(bgp_vrf->vrf_flags, BGP_VRF_L3VNI_PREFIX_ROUTES_ONLY);
/*
* VNI_FLAG_USE_TWO_LABELS flag for linked L2VNIs should not be
* set before linking vrf to L3VNI. Thus, no need to clear
* that explicitly.
*/
} else {
UNSET_FLAG(bgp_vrf->vrf_flags,
BGP_VRF_L3VNI_PREFIX_ROUTES_ONLY);
for (ALL_LIST_ELEMENTS_RO(bgp_vrf->l2vnis, node, vpn)) {
if (!CHECK_FLAG(vpn->flags, VNI_FLAG_USE_TWO_LABELS)) {
/*
* If we are flapping VNI_FLAG_USE_TWO_LABELS
* flag, update all MACIP routes in this VNI
*/
SET_FLAG(vpn->flags, VNI_FLAG_USE_TWO_LABELS);
update_all_type2_routes(bgp_evpn, vpn);
}
}
}
/* Map auto derive or configured RTs */
if (!CHECK_FLAG(bgp_vrf->vrf_flags, BGP_VRF_IMPORT_RT_CFGD) ||
CHECK_FLAG(bgp_vrf->vrf_flags, BGP_VRF_IMPORT_AUTO_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) ||
CHECK_FLAG(bgp_vrf->vrf_flags, BGP_VRF_EXPORT_AUTO_RT_CFGD))
evpn_auto_rt_export_add_for_vrf(bgp_vrf);
/* auto derive RD */
bgp_evpn_derive_auto_rd_for_vrf(bgp_vrf);
/* link all corresponding l2vnis */
hash_iterate(bgp_evpn->vnihash,
(void (*)(struct hash_bucket *,
void *))link_l2vni_hash_to_l3vni,
bgp_vrf);
/* Only update all corresponding type-2 routes if we are advertising two
* labels along with type-2 routes
*/
if (!filter)
for (ALL_LIST_ELEMENTS_RO(bgp_vrf->l2vnis, node, vpn))
update_routes_for_vni(bgp_evpn, vpn);
/* advertise type-5 routes if needed */
update_advertise_vrf_routes(bgp_vrf);
/* install all remote routes belonging to this l3vni into correspondng
* vrf */
install_routes_for_vrf(bgp_vrf);
return 0;
}
int bgp_evpn_local_l3vni_del(vni_t l3vni, vrf_id_t vrf_id)
{
struct bgp *bgp_vrf = NULL; /* bgp vrf instance */
struct bgp *bgp_evpn = NULL; /* EVPN bgp instance */
struct listnode *node = NULL;
struct listnode *next = NULL;
struct bgpevpn *vpn = NULL;
bgp_vrf = bgp_lookup_by_vrf_id(vrf_id);
if (!bgp_vrf) {
flog_err(
EC_BGP_NO_DFLT,
"Cannot process L3VNI %u Del - Could not find BGP instance",
l3vni);
return -1;
}
bgp_evpn = bgp_get_evpn();
if (!bgp_evpn) {
flog_err(
EC_BGP_NO_DFLT,
"Cannot process L3VNI %u Del - Could not find EVPN BGP instance",
l3vni);
return -1;
}
/* Remove remote routes from BGT VRF even if BGP_VRF_AUTO is configured,
* bgp_delete would not remove/decrement bgp_path_info of the ip_prefix
* routes. This will uninstalling the routes from zebra and decremnt the
* bgp info count.
*/
uninstall_routes_for_vrf(bgp_vrf);
/* delete/withdraw all type-5 routes */
delete_withdraw_vrf_routes(bgp_vrf);
/* remove the l3vni from vrf instance */
bgp_vrf->l3vni = 0;
/* remove the Rmac from the BGP vrf */
memset(&bgp_vrf->rmac, 0, sizeof(struct ethaddr));
memset(&bgp_vrf->evpn_info->pip_rmac_zebra, 0, ETH_ALEN);
if (is_zero_mac(&bgp_vrf->evpn_info->pip_rmac_static) &&
!is_zero_mac(&bgp_vrf->evpn_info->pip_rmac))
memset(&bgp_vrf->evpn_info->pip_rmac, 0, ETH_ALEN);
/* remove default import RT or Unmap non-default import RT */
if (!list_isempty(bgp_vrf->vrf_import_rtl)) {
bgp_evpn_unmap_vrf_from_its_rts(bgp_vrf);
if (!CHECK_FLAG(bgp_vrf->vrf_flags, BGP_VRF_IMPORT_RT_CFGD))
list_delete_all_node(bgp_vrf->vrf_import_rtl);
}
/* remove default export RT */
if (!list_isempty(bgp_vrf->vrf_export_rtl) &&
!CHECK_FLAG(bgp_vrf->vrf_flags, BGP_VRF_EXPORT_RT_CFGD)) {
list_delete_all_node(bgp_vrf->vrf_export_rtl);
}
/* update all corresponding local mac-ip routes */
if (!CHECK_FLAG(bgp_vrf->vrf_flags, BGP_VRF_L3VNI_PREFIX_ROUTES_ONLY)) {
for (ALL_LIST_ELEMENTS_RO(bgp_vrf->l2vnis, node, vpn)) {
UNSET_FLAG(vpn->flags, VNI_FLAG_USE_TWO_LABELS);
update_routes_for_vni(bgp_evpn, vpn);
}
}
/* If any L2VNIs point to this instance, unlink them. */
for (ALL_LIST_ELEMENTS(bgp_vrf->l2vnis, node, next, vpn))
bgpevpn_unlink_from_l3vni(vpn);
UNSET_FLAG(bgp_vrf->vrf_flags, BGP_VRF_L3VNI_PREFIX_ROUTES_ONLY);
/* Delete the instance if it was autocreated */
if (CHECK_FLAG(bgp_vrf->vrf_flags, BGP_VRF_AUTO))
bgp_delete(bgp_vrf);
return 0;
}
/*
* Handle del of a local VNI.
*/
int bgp_evpn_local_vni_del(struct bgp *bgp, vni_t vni)
{
struct bgpevpn *vpn;
/* Locate VNI hash */
vpn = bgp_evpn_lookup_vni(bgp, vni);
if (!vpn) {
if (bgp_debug_zebra(NULL))
flog_warn(
EC_BGP_EVPN_VPN_VNI,
"%u: VNI hash entry for VNI %u not found at DEL",
bgp->vrf_id, vni);
return 0;
}
/* Remove all local EVPN routes and schedule for processing (to
* withdraw from peers).
*/
delete_routes_for_vni(bgp, vpn);
bgp_evpn_unlink_from_vni_svi_hash(bgp, vpn);
vpn->svi_ifindex = 0;
/*
* 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,
ifindex_t svi_ifindex)
{
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
&& vpn->svi_ifindex == svi_ifindex)
/* Probably some other param has changed that we don't
* care about. */
return 0;
bgp_evpn_mcast_grp_change(bgp, vpn, mcast_grp);
if (vpn->svi_ifindex != svi_ifindex) {
/*
* Unresolve all the gateway IP nexthops for this VNI
* for old SVI
*/
bgp_evpn_remote_ip_hash_iterate(
vpn,
(void (*)(struct hash_bucket *, void *))
bgp_evpn_remote_ip_hash_unlink_nexthop,
vpn);
bgp_evpn_unlink_from_vni_svi_hash(bgp, vpn);
vpn->svi_ifindex = svi_ifindex;
bgp_evpn_link_to_vni_svi_hash(bgp, vpn);
/*
* Resolve all the gateway IP nexthops for this VNI
* for new SVI
*/
bgp_evpn_remote_ip_hash_iterate(
vpn,
(void (*)(struct hash_bucket *, void *))
bgp_evpn_remote_ip_hash_link_nexthop,
vpn);
}
/* Update tenant_vrf_id if it has changed. */
if (vpn->tenant_vrf_id != tenant_vrf_id) {
/*
* Unresolve all the gateway IP nexthops for this VNI
* in old tenant vrf
*/
bgp_evpn_remote_ip_hash_iterate(
vpn,
(void (*)(struct hash_bucket *, void *))
bgp_evpn_remote_ip_hash_unlink_nexthop,
vpn);
bgpevpn_unlink_from_l3vni(vpn);
vpn->tenant_vrf_id = tenant_vrf_id;
bgpevpn_link_to_l3vni(vpn);
/*
* Resolve all the gateway IP nexthops for this VNI
* in new tenant vrf
*/
bgp_evpn_remote_ip_hash_iterate(
vpn,
(void (*)(struct hash_bucket *, void *))
bgp_evpn_remote_ip_hash_link_nexthop,
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);
} else {
/* Create or update as appropriate. */
vpn = bgp_evpn_new(bgp, vni, originator_ip, tenant_vrf_id,
mcast_grp, svi_ifindex);
}
/* 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, NULL)) {
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;
}
/*
* 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_clean(bgp->import_rt_hash, (void (*)(void *))hash_import_rt_free);
hash_free(bgp->import_rt_hash);
bgp->import_rt_hash = NULL;
hash_clean(bgp->vrf_import_rt_hash,
(void (*)(void *))hash_vrf_import_rt_free);
hash_free(bgp->vrf_import_rt_hash);
bgp->vrf_import_rt_hash = NULL;
hash_clean(bgp->vni_svi_hash, (void (*)(void *))hash_evpn_free);
hash_free(bgp->vni_svi_hash);
bgp->vni_svi_hash = NULL;
hash_free(bgp->vnihash);
bgp->vnihash = 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->vni_svi_hash =
hash_create(vni_svi_hash_key_make, vni_svi_hash_cmp,
"BGP VNI hash based on SVI ifindex");
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_vrf_route_target_cmp;
bgp->vrf_import_rtl->del = evpn_vrf_rt_del;
bgp->vrf_export_rtl = list_new();
bgp->vrf_export_rtl->cmp =
(int (*)(void *, void *))evpn_vrf_route_target_cmp;
bgp->vrf_export_rtl->del = evpn_vrf_rt_del;
bgp->l2vnis = list_new();
bgp->l2vnis->cmp = vni_list_cmp;
/* By default Duplicate Address Dection is enabled.
* Max-moves (N) 5, detection time (M) 180
* default action is warning-only
* freeze action permanently freezes address,
* and freeze time (auto-recovery) is disabled.
*/
if (bgp->evpn_info) {
bgp->evpn_info->dup_addr_detect = true;
bgp->evpn_info->dad_time = EVPN_DAD_DEFAULT_TIME;
bgp->evpn_info->dad_max_moves = EVPN_DAD_DEFAULT_MAX_MOVES;
bgp->evpn_info->dad_freeze = false;
bgp->evpn_info->dad_freeze_time = 0;
/* Initialize zebra vxlan */
bgp_zebra_dup_addr_detection(bgp);
/* Enable PIP feature by default for bgp vrf instance */
if (bgp->inst_type == BGP_INSTANCE_TYPE_VRF) {
struct bgp *bgp_default;
bgp->evpn_info->advertise_pip = true;
bgp_default = bgp_get_default();
if (bgp_default)
bgp->evpn_info->pip_ip = bgp_default->router_id;
}
}
/* Default BUM handling is to do head-end replication. */
bgp->vxlan_flood_ctrl = VXLAN_FLOOD_HEAD_END_REPL;
bgp_evpn_nh_init(bgp);
}
void bgp_evpn_vrf_delete(struct bgp *bgp_vrf)
{
bgp_evpn_unmap_vrf_from_its_rts(bgp_vrf);
bgp_evpn_nh_finish(bgp_vrf);
}
/*
* Get the prefixlen of the ip prefix carried within the type5 evpn route.
*/
int bgp_evpn_get_type5_prefixlen(const struct prefix *pfx)
{
struct prefix_evpn *evp = (struct prefix_evpn *)pfx;
if (!pfx || pfx->family != AF_EVPN)
return 0;
if (evp->prefix.route_type != BGP_EVPN_IP_PREFIX_ROUTE)
return 0;
return evp->prefix.prefix_addr.ip_prefix_length;
}
/*
* Should we register nexthop for this EVPN prefix for nexthop tracking?
*/
bool bgp_evpn_is_prefix_nht_supported(const struct prefix *pfx)
{
struct prefix_evpn *evp = (struct prefix_evpn *)pfx;
/*
* EVPN routes should be marked as valid only if the nexthop is
* reachable. Only if this happens, the route should be imported
* (into VNI or VRF routing tables) and/or advertised.
* Note: This is currently applied for EVPN type-1, type-2,
* type-3, type-4 and type-5 routes.
* It may be tweaked later on for other routes, or
* even removed completely when all routes are handled.
*/
if (pfx && pfx->family == AF_EVPN
&& (evp->prefix.route_type == BGP_EVPN_MAC_IP_ROUTE
|| evp->prefix.route_type == BGP_EVPN_AD_ROUTE
|| evp->prefix.route_type == BGP_EVPN_ES_ROUTE
|| evp->prefix.route_type == BGP_EVPN_IMET_ROUTE
|| evp->prefix.route_type == BGP_EVPN_IP_PREFIX_ROUTE))
return true;
return false;
}
static void *bgp_evpn_remote_ip_hash_alloc(void *p)
{
const struct evpn_remote_ip *key = (const struct evpn_remote_ip *)p;
struct evpn_remote_ip *ip;
ip = XMALLOC(MTYPE_EVPN_REMOTE_IP, sizeof(struct evpn_remote_ip));
*ip = *key;
ip->macip_path_list = list_new();
return ip;
}
static unsigned int bgp_evpn_remote_ip_hash_key_make(const void *p)
{
const struct evpn_remote_ip *ip = p;
const struct ipaddr *addr = &ip->addr;
if (IS_IPADDR_V4(addr))
return jhash_1word(addr->ipaddr_v4.s_addr, 0);
return jhash2(addr->ipaddr_v6.s6_addr32,
array_size(addr->ipaddr_v6.s6_addr32), 0);
}
static bool bgp_evpn_remote_ip_hash_cmp(const void *p1, const void *p2)
{
const struct evpn_remote_ip *ip1 = p1;
const struct evpn_remote_ip *ip2 = p2;
return !ipaddr_cmp(&ip1->addr, &ip2->addr);
}
static void bgp_evpn_remote_ip_hash_init(struct bgpevpn *vpn)
{
if (!evpn_resolve_overlay_index())
return;
vpn->remote_ip_hash = hash_create(bgp_evpn_remote_ip_hash_key_make,
bgp_evpn_remote_ip_hash_cmp,
"BGP EVPN remote IP hash");
}
static void bgp_evpn_remote_ip_hash_free(struct hash_bucket *bucket, void *args)
{
struct evpn_remote_ip *ip = (struct evpn_remote_ip *)bucket->data;
struct bgpevpn *vpn = (struct bgpevpn *)args;
bgp_evpn_remote_ip_process_nexthops(vpn, &ip->addr, false);
list_delete(&ip->macip_path_list);
hash_release(vpn->remote_ip_hash, ip);
XFREE(MTYPE_EVPN_REMOTE_IP, ip);
}
static void bgp_evpn_remote_ip_hash_destroy(struct bgpevpn *vpn)
{
if (!evpn_resolve_overlay_index() || vpn->remote_ip_hash == NULL)
return;
hash_iterate(vpn->remote_ip_hash,
(void (*)(struct hash_bucket *, void *))bgp_evpn_remote_ip_hash_free,
vpn);
hash_free(vpn->remote_ip_hash);
vpn->remote_ip_hash = NULL;
}
/* Add a remote MAC/IP route to hash table */
static void bgp_evpn_remote_ip_hash_add(struct bgpevpn *vpn,
struct bgp_path_info *pi)
{
struct evpn_remote_ip tmp;
struct evpn_remote_ip *ip;
struct prefix_evpn *evp;
if (!evpn_resolve_overlay_index())
return;
if (pi->type != ZEBRA_ROUTE_BGP || pi->sub_type != BGP_ROUTE_IMPORTED
|| !CHECK_FLAG(pi->flags, BGP_PATH_VALID))
return;
evp = (struct prefix_evpn *)&pi->net->p;
if (evp->family != AF_EVPN
|| evp->prefix.route_type != BGP_EVPN_MAC_IP_ROUTE
|| is_evpn_prefix_ipaddr_none(evp))
return;
tmp.addr = evp->prefix.macip_addr.ip;
ip = hash_lookup(vpn->remote_ip_hash, &tmp);
if (ip) {
if (listnode_lookup(ip->macip_path_list, pi) != NULL)
return;
(void)listnode_add(ip->macip_path_list, pi);
return;
}
ip = hash_get(vpn->remote_ip_hash, &tmp, bgp_evpn_remote_ip_hash_alloc);
(void)listnode_add(ip->macip_path_list, pi);
bgp_evpn_remote_ip_process_nexthops(vpn, &ip->addr, true);
}
/* Delete a remote MAC/IP route from hash table */
static void bgp_evpn_remote_ip_hash_del(struct bgpevpn *vpn,
struct bgp_path_info *pi)
{
struct evpn_remote_ip tmp;
struct evpn_remote_ip *ip;
struct prefix_evpn *evp;
if (!evpn_resolve_overlay_index())
return;
evp = (struct prefix_evpn *)&pi->net->p;
if (evp->family != AF_EVPN
|| evp->prefix.route_type != BGP_EVPN_MAC_IP_ROUTE
|| is_evpn_prefix_ipaddr_none(evp))
return;
tmp.addr = evp->prefix.macip_addr.ip;
ip = hash_lookup(vpn->remote_ip_hash, &tmp);
if (ip == NULL)
return;
listnode_delete(ip->macip_path_list, pi);
if (ip->macip_path_list->count == 0) {
bgp_evpn_remote_ip_process_nexthops(vpn, &ip->addr, false);
hash_release(vpn->remote_ip_hash, ip);
XFREE(MTYPE_EVPN_REMOTE_IP, ip);
}
}
static void bgp_evpn_remote_ip_hash_iterate(struct bgpevpn *vpn,
void (*func)(struct hash_bucket *,
void *),
void *arg)
{
if (!evpn_resolve_overlay_index())
return;
hash_iterate(vpn->remote_ip_hash, func, arg);
}
static void show_remote_ip_entry(struct hash_bucket *bucket, void *args)
{
char buf[INET6_ADDRSTRLEN];
struct listnode *node = NULL;
struct bgp_path_info *pi = NULL;
struct vty *vty = (struct vty *)args;
struct evpn_remote_ip *ip = (struct evpn_remote_ip *)bucket->data;
vty_out(vty, " Remote IP: %s\n",
ipaddr2str(&ip->addr, buf, sizeof(buf)));
vty_out(vty, " Linked MAC/IP routes:\n");
for (ALL_LIST_ELEMENTS_RO(ip->macip_path_list, node, pi))
vty_out(vty, " %pFX\n", &pi->net->p);
}
void bgp_evpn_show_remote_ip_hash(struct hash_bucket *bucket, void *args)
{
struct bgpevpn *vpn = (struct bgpevpn *)bucket->data;
struct vty *vty = (struct vty *)args;
vty_out(vty, "VNI: %u\n", vpn->vni);
bgp_evpn_remote_ip_hash_iterate(
vpn,
(void (*)(struct hash_bucket *, void *))show_remote_ip_entry,
vty);
vty_out(vty, "\n");
}
static void bgp_evpn_remote_ip_hash_link_nexthop(struct hash_bucket *bucket,
void *args)
{
struct evpn_remote_ip *ip = (struct evpn_remote_ip *)bucket->data;
struct bgpevpn *vpn = (struct bgpevpn *)args;
bgp_evpn_remote_ip_process_nexthops(vpn, &ip->addr, true);
}
static void bgp_evpn_remote_ip_hash_unlink_nexthop(struct hash_bucket *bucket,
void *args)
{
struct evpn_remote_ip *ip = (struct evpn_remote_ip *)bucket->data;
struct bgpevpn *vpn = (struct bgpevpn *)args;
bgp_evpn_remote_ip_process_nexthops(vpn, &ip->addr, false);
}
static unsigned int vni_svi_hash_key_make(const void *p)
{
const struct bgpevpn *vpn = p;
return jhash_1word(vpn->svi_ifindex, 0);
}
static bool vni_svi_hash_cmp(const void *p1, const void *p2)
{
const struct bgpevpn *vpn1 = p1;
const struct bgpevpn *vpn2 = p2;
return (vpn1->svi_ifindex == vpn2->svi_ifindex);
}
static struct bgpevpn *bgp_evpn_vni_svi_hash_lookup(struct bgp *bgp,
ifindex_t svi)
{
struct bgpevpn *vpn;
struct bgpevpn tmp;
memset(&tmp, 0, sizeof(tmp));
tmp.svi_ifindex = svi;
vpn = hash_lookup(bgp->vni_svi_hash, &tmp);
return vpn;
}
static void bgp_evpn_link_to_vni_svi_hash(struct bgp *bgp, struct bgpevpn *vpn)
{
if (vpn->svi_ifindex == 0)
return;
(void)hash_get(bgp->vni_svi_hash, vpn, hash_alloc_intern);
}
static void bgp_evpn_unlink_from_vni_svi_hash(struct bgp *bgp,
struct bgpevpn *vpn)
{
if (vpn->svi_ifindex == 0)
return;
hash_release(bgp->vni_svi_hash, vpn);
}
void bgp_evpn_show_vni_svi_hash(struct hash_bucket *bucket, void *args)
{
struct bgpevpn *evpn = (struct bgpevpn *)bucket->data;
struct vty *vty = (struct vty *)args;
vty_out(vty, "SVI: %u VNI: %u\n", evpn->svi_ifindex, evpn->vni);
}
/*
* This function is called for a bgp_nexthop_cache entry when the nexthop is
* gateway IP overlay index.
* This function returns true if there is a remote MAC/IP route for the gateway
* IP in the EVI of the nexthop SVI.
*/
bool bgp_evpn_is_gateway_ip_resolved(struct bgp_nexthop_cache *bnc)
{
struct bgp *bgp_evpn = NULL;
struct bgpevpn *vpn = NULL;
struct evpn_remote_ip tmp;
struct prefix *p;
if (!evpn_resolve_overlay_index())
return false;
if (!bnc->nexthop || bnc->nexthop->ifindex == 0)
return false;
bgp_evpn = bgp_get_evpn();
if (!bgp_evpn)
return false;
/*
* Gateway IP is resolved by nht over SVI interface.
* Use this SVI to find corresponding EVI(L2 context)
*/
vpn = bgp_evpn_vni_svi_hash_lookup(bgp_evpn, bnc->nexthop->ifindex);
if (!vpn)
return false;
if (vpn->bgp_vrf != bnc->bgp)
return false;
/*
* Check if the gateway IP is present in the EVI remote_ip_hash table
* which stores all the remote IP addresses received via MAC/IP routes
* in this EVI
*/
memset(&tmp, 0, sizeof(tmp));
p = &bnc->prefix;
if (p->family == AF_INET) {
tmp.addr.ipa_type = IPADDR_V4;
memcpy(&(tmp.addr.ipaddr_v4), &(p->u.prefix4),
sizeof(struct in_addr));
} else if (p->family == AF_INET6) {
tmp.addr.ipa_type = IPADDR_V6;
memcpy(&(tmp.addr.ipaddr_v6), &(p->u.prefix6),
sizeof(struct in6_addr));
} else
return false;
if (hash_lookup(vpn->remote_ip_hash, &tmp) == NULL)
return false;
return true;
}
/* Resolve/Unresolve nexthops when a MAC/IP route is added/deleted */
static void bgp_evpn_remote_ip_process_nexthops(struct bgpevpn *vpn,
struct ipaddr *addr,
bool resolve)
{
afi_t afi;
struct prefix p;
struct bgp_nexthop_cache *bnc;
struct bgp_nexthop_cache_head *tree = NULL;
if (!vpn->bgp_vrf || vpn->svi_ifindex == 0)
return;
memset(&p, 0, sizeof(p));
if (addr->ipa_type == IPADDR_V4) {
afi = AFI_IP;
p.family = AF_INET;
memcpy(&(p.u.prefix4), &(addr->ipaddr_v4),
sizeof(struct in_addr));
p.prefixlen = IPV4_MAX_BITLEN;
} else if (addr->ipa_type == IPADDR_V6) {
afi = AFI_IP6;
p.family = AF_INET6;
memcpy(&(p.u.prefix6), &(addr->ipaddr_v6),
sizeof(struct in6_addr));
p.prefixlen = IPV6_MAX_BITLEN;
} else
return;
tree = &vpn->bgp_vrf->nexthop_cache_table[afi];
bnc = bnc_find(tree, &p, 0, 0);
if (!bnc || !bnc->is_evpn_gwip_nexthop)
return;
if (!bnc->nexthop || bnc->nexthop->ifindex != vpn->svi_ifindex)
return;
if (BGP_DEBUG(nht, NHT))
zlog_debug("%s(%u): vni %u mac/ip %s for NH %pFX",
vpn->bgp_vrf->name_pretty, vpn->tenant_vrf_id,
vpn->vni, (resolve ? "add" : "delete"),
&bnc->prefix);
/*
* MAC/IP route or SVI or tenant vrf being added to EVI.
* Set nexthop as valid only if it is already L3 reachable
*/
if (resolve && bnc->flags & BGP_NEXTHOP_EVPN_INCOMPLETE) {
bnc->flags &= ~BGP_NEXTHOP_EVPN_INCOMPLETE;
bnc->flags |= BGP_NEXTHOP_VALID;
bnc->change_flags |= BGP_NEXTHOP_MACIP_CHANGED;
evaluate_paths(bnc);
}
/* MAC/IP route or SVI or tenant vrf being deleted from EVI */
if (!resolve && bnc->flags & BGP_NEXTHOP_VALID) {
bnc->flags &= ~BGP_NEXTHOP_VALID;
bnc->flags |= BGP_NEXTHOP_EVPN_INCOMPLETE;
bnc->change_flags |= BGP_NEXTHOP_MACIP_CHANGED;
evaluate_paths(bnc);
}
}
void bgp_evpn_handle_resolve_overlay_index_set(struct hash_bucket *bucket,
void *arg)
{
struct bgpevpn *vpn = (struct bgpevpn *)bucket->data;
struct bgp_dest *dest;
struct bgp_path_info *pi;
bgp_evpn_remote_ip_hash_init(vpn);
for (dest = bgp_table_top(vpn->route_table); dest;
dest = bgp_route_next(dest))
for (pi = bgp_dest_get_bgp_path_info(dest); pi; pi = pi->next)
bgp_evpn_remote_ip_hash_add(vpn, pi);
}
void bgp_evpn_handle_resolve_overlay_index_unset(struct hash_bucket *bucket,
void *arg)
{
struct bgpevpn *vpn = (struct bgpevpn *)bucket->data;
bgp_evpn_remote_ip_hash_destroy(vpn);
}
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