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frr/bgpd/bgp_evpn_mh.h

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// SPDX-License-Identifier: GPL-2.0-or-later
/* EVPN header for multihoming procedures
*
* Copyright (C) 2019 Cumulus Networks
* Anuradha Karuppiah
*
*/
#ifndef _FRR_BGP_EVPN_MH_H
#define _FRR_BGP_EVPN_MH_H
#include "vxlan.h"
#include "bgpd.h"
#include "bgp_evpn.h"
#include "bgp_evpn_private.h"
#define BGP_EVPN_AD_ES_ETH_TAG 0xffffffff
#define BGP_EVPN_AD_EVI_ETH_TAG 0
#define BGP_EVPNES_INCONS_STR_SZ 80
#define BGP_EVPN_VTEPS_FLAG_STR_SZ (BGP_EVPN_FLAG_STR_SZ * ES_VTEP_MAX_CNT)
#define BGP_EVPN_CONS_CHECK_INTERVAL 60
#define BGP_EVPN_MH_USE_ES_L3NHG_DEF true
/* XXX - tune this */
#define BGP_EVPN_MAX_EVI_PER_ES_FRAG 128
/* An ES can result in multiple EAD-per-ES route. Each EAD fragment is
* associated with an unique RD
*/
struct bgp_evpn_es_frag {
/* frag is associated with a parent ES */
struct bgp_evpn_es *es;
/* Id for deriving the RD automatically for this ES fragment */
uint16_t rd_id;
/* RD for this ES fragment */
struct prefix_rd prd;
/* Memory used for linking bgp_evpn_es_frag to
* bgp_evpn_es->es_frag_list
*/
struct listnode es_listnode;
/* List of ES-EVIs associated with this fragment */
struct list *es_evi_frag_list;
};
/* Ethernet Segment entry -
* - Local and remote ESs are maintained in a global RB tree,
* bgp_mh_info->es_rb_tree using ESI as key
* - Local ESs are received from zebra (BGP_EVPNES_LOCAL)
* - Remotes ESs are implicitly created (by reference) by a remote ES-EVI
* (BGP_EVPNES_REMOTE)
* - An ES can be simultaneously LOCAL and REMOTE; infact all LOCAL ESs are
* expected to have REMOTE ES peers.
*/
struct bgp_evpn_es {
/* Ethernet Segment Identifier */
esi_t esi;
char esi_str[ESI_STR_LEN];
/* es flags */
uint32_t flags;
/* created via zebra config */
#define BGP_EVPNES_LOCAL (1 << 0)
/* created implicitly by a remote ES-EVI reference */
#define BGP_EVPNES_REMOTE (1 << 1)
/* local ES link is oper-up */
#define BGP_EVPNES_OPER_UP (1 << 2)
/* enable generation of EAD-EVI routes */
#define BGP_EVPNES_ADV_EVI (1 << 3)
/* consistency checks pending */
#define BGP_EVPNES_CONS_CHECK_PEND (1 << 4)
/* ES is in LACP bypass mode - don't advertise EAD-ES or ESR */
#define BGP_EVPNES_BYPASS (1 << 5)
/* bits needed for printing the flags + null */
#define BGP_EVPN_FLAG_STR_SZ 7
/* memory used for adding the es to bgp->es_rb_tree */
RB_ENTRY(bgp_evpn_es) rb_node;
/* [EVPNES_LOCAL] memory used for linking the es to
* bgp_mh_info->local_es_list
*/
struct listnode es_listnode;
/* memory used for linking the es to "processing" pending list
* bgp_mh_info->pend_es_list
*/
struct listnode pend_es_listnode;
/* [EVPNES_LOCAL] List of RDs for this ES (bgp_evpn_es_frag) */
struct list *es_frag_list;
struct bgp_evpn_es_frag *es_base_frag;
/* [EVPNES_LOCAL] originator ip address */
struct in_addr originator_ip;
/* [EVPNES_LOCAL] Route table for EVPN routes for this ESI-
* - Type-4 local and remote routes
* - Type-1 local routes
*/
struct bgp_table *route_table;
/* list of PEs (bgp_evpn_es_vtep) attached to the ES */
struct list *es_vtep_list;
/* List of ES-EVIs associated with this ES */
struct list *es_evi_list;
/* List of ES-VRFs associated with this ES */
struct list *es_vrf_list;
/* List of MAC-IP VNI paths using this ES as destination -
* element is bgp_path_info_extra->es_info
* Note: Only local/zebra-added MACIP paths in the VNI
* routing table are linked to this list
*/
struct list *macip_evi_path_list;
/* List of MAC-IP paths in the global routing table using this
* ES as destination - data is bgp_path_info_extra->es_info
* Note: Only non-local/imported MACIP paths in the global
* routing table are linked to this list
*/
struct list *macip_global_path_list;
/* Number of remote VNIs referencing this ES */
uint32_t remote_es_evi_cnt;
uint32_t inconsistencies;
/* there are one or more EVIs whose VTEP list doesn't match
* with the ES's VTEP list
*/
#define BGP_EVPNES_INCONS_VTEP_LIST (1 << 0)
/* number of es-evi entries whose VTEP list doesn't match
* with the ES's
*/
uint32_t incons_evi_vtep_cnt;
/* preference config for BUM-DF election. advertised via the ESR. */
uint16_t df_pref;
QOBJ_FIELDS;
};
DECLARE_QOBJ_TYPE(bgp_evpn_es);
RB_HEAD(bgp_es_rb_head, bgp_evpn_es);
RB_PROTOTYPE(bgp_es_rb_head, bgp_evpn_es, rb_node, bgp_es_rb_cmp);
/* PE attached to an ES */
struct bgp_evpn_es_vtep {
struct bgp_evpn_es *es; /* parent ES */
struct in_addr vtep_ip;
char vtep_str[INET6_ADDRSTRLEN];
uint32_t flags;
/* Rxed a Type4 route from this PE */
#define BGP_EVPNES_VTEP_ESR (1 << 0)
/* Active (rxed EAD-ES and EAD-EVI) and can be included as
* a nexthop
*/
#define BGP_EVPNES_VTEP_ACTIVE (1 << 1)
uint32_t evi_cnt; /* es_evis referencing this vtep as an active path */
/* Algorithm and preference for DF election. Rxed via the ESR */
uint8_t df_alg;
uint16_t df_pref;
/* memory used for adding the entry to es->es_vtep_list */
struct listnode es_listnode;
};
/* ES-VRF element needed for managing L3 NHGs. It is implicitly created
* when an ES-EVI is associated with a tenant VRF
*/
struct bgp_evpn_es_vrf {
struct bgp_evpn_es *es;
struct bgp *bgp_vrf;
uint32_t flags;
/* NHG can only be activated if there are active VTEPs in the ES and
* there is a valid L3-VNI associated with the VRF
*/
#define BGP_EVPNES_VRF_NHG_ACTIVE (1 << 0)
/* memory used for adding the es_vrf to
* es_vrf->bgp_vrf->es_vrf_rb_tree
*/
RB_ENTRY(bgp_evpn_es_vrf) rb_node;
/* memory used for linking the es_vrf to es_vrf->es->es_vrf_list */
struct listnode es_listnode;
uint32_t nhg_id;
uint32_t v6_nhg_id;
/* Number of ES-EVI entries associated with this ES-VRF */
uint32_t ref_cnt;
};
/* ES per-EVI info
* - ES-EVIs are maintained per-L2-VNI (vpn->es_evi_rb_tree)
* - ES-EVIs are also linked to the parent ES (es->es_evi_list)
* - Local ES-EVIs are created by zebra (via config). They are linked to a
* per-VNI list (vpn->local_es_evi_list) for quick access
* - Remote ES-EVIs are created implicitly when a bgp_evpn_es_evi_vtep
* references it.
*/
struct bgp_evpn_es_evi {
struct bgp_evpn_es *es;
/* Only applicableif EVI_LOCAL */
struct bgp_evpn_es_frag *es_frag;
struct bgpevpn *vpn;
/* ES-EVI flags */
uint32_t flags;
/* local ES-EVI, created by zebra */
#define BGP_EVPNES_EVI_LOCAL (1 << 0)
/* created via a remote VTEP imported by BGP */
#define BGP_EVPNES_EVI_REMOTE (1 << 1)
#define BGP_EVPNES_EVI_INCONS_VTEP_LIST (1 << 2)
/* memory used for adding the es_evi to es_evi->vpn->es_evi_rb_tree */
RB_ENTRY(bgp_evpn_es_evi) rb_node;
/* memory used for linking the es_evi to
* es_evi->vpn->local_es_evi_list
*/
struct listnode l2vni_listnode;
/* memory used for linking the es_evi to
* es_evi->es->es_evi_list
*/
struct listnode es_listnode;
/* memory used for linking the es_evi to
* es_evi->es_frag->es_evi_frag_list
*/
struct listnode es_frag_listnode;
/* list of PEs (bgp_evpn_es_evi_vtep) attached to the ES for this VNI */
struct list *es_evi_vtep_list;
struct bgp_evpn_es_vrf *es_vrf;
};
/* PE attached to an ES for a VNI. This entry is created when an EAD-per-ES
* or EAD-per-EVI Type1 route is imported into the VNI.
*/
struct bgp_evpn_es_evi_vtep {
struct bgp_evpn_es_evi *es_evi; /* parent ES-EVI */
struct in_addr vtep_ip;
uint32_t flags;
/* Rxed an EAD-per-ES route from the PE */
#define BGP_EVPN_EVI_VTEP_EAD_PER_ES (1 << 0) /* rxed EAD-per-ES */
/* Rxed an EAD-per-EVI route from the PE */
#define BGP_EVPN_EVI_VTEP_EAD_PER_EVI (1 << 1) /* rxed EAD-per-EVI */
/* VTEP is active i.e. will result in the creation of an es-vtep */
#define BGP_EVPN_EVI_VTEP_ACTIVE (1 << 2)
#define BGP_EVPN_EVI_VTEP_EAD (BGP_EVPN_EVI_VTEP_EAD_PER_ES |\
BGP_EVPN_EVI_VTEP_EAD_PER_EVI)
/* memory used for adding the entry to es_evi->es_evi_vtep_list */
struct listnode es_evi_listnode;
struct bgp_evpn_es_vtep *es_vtep;
};
/* A nexthop is created when a path (imported from an EVPN type-2 route)
* is added to the VRF route table using that nexthop.
* It is added on first pi reference and removed on last pi deref.
*/
struct bgp_evpn_nh {
/* backpointer to the VRF */
struct bgp *bgp_vrf;
/* nexthop/VTEP IP */
struct ipaddr ip;
/* description for easy logging */
char nh_str[INET6_ADDRSTRLEN];
struct ethaddr rmac;
/* pi from which we are pulling the nh RMAC */
struct bgp_path_info *ref_pi;
/* List of VRF paths using this nexthop */
struct list *pi_list;
uint8_t flags;
#define BGP_EVPN_NH_READY_FOR_ZEBRA (1 << 0)
};
/* multihoming information stored in bgp_master */
#define bgp_mh_info (bm->mh_info)
struct bgp_evpn_mh_info {
/* RB tree of Ethernet segments (used for EVPN-MH) */
struct bgp_es_rb_head es_rb_tree;
/* List of local ESs */
struct list *local_es_list;
/* List of ESs with pending/periodic processing */
struct list *pend_es_list;
/* periodic timer for running background consistency checks */
struct thread *t_cons_check;
/* config knobs for optimizing or interop */
/* Generate EAD-EVI routes even if the ES is oper-down. This can be
* enabled as an optimization to avoid a storm of updates when an ES
* link flaps.
*/
bool ead_evi_adv_for_down_links;
/* Enable ES consistency checking */
bool consistency_checking;
/* Use L3 NHGs for host routes in symmetric IRB */
bool host_routes_use_l3nhg;
/* Some vendors are not generating the EAD-per-EVI route. This knob
* can be turned off to activate a remote ES-PE when the EAD-per-ES
* route is rxed i.e. not wait on the EAD-per-EVI route
*/
bool ead_evi_rx;
#define BGP_EVPN_MH_EAD_EVI_RX_DEF true
/* Skip EAD-EVI advertisements by turning off this knob */
bool ead_evi_tx;
#define BGP_EVPN_MH_EAD_EVI_TX_DEF true
/* If the Local ES is inactive we advertise the MAC-IP without the
* L3 ecomm
*/
bool suppress_l3_ecomm_on_inactive_es;
/* Setup EVPN PE nexthops and their RMAC in bgpd */
bool bgp_evpn_nh_setup;
/* If global export-rts are configured that is used for sending
* sending the ead-per-es route instead of the L2-VNI(s) RTs
*/
struct list *ead_es_export_rtl;
/* Number of EVIs in an ES fragment - used of EAD-per-ES route
* construction
*/
uint32_t evi_per_es_frag;
};
/****************************************************************************/
static inline int bgp_evpn_is_es_local(struct bgp_evpn_es *es)
{
return CHECK_FLAG(es->flags, BGP_EVPNES_LOCAL) ? 1 : 0;
}
extern esi_t *zero_esi;
static inline bool bgp_evpn_is_esi_valid(esi_t *esi)
{
return !!memcmp(esi, zero_esi, sizeof(esi_t));
}
static inline esi_t *bgp_evpn_attr_get_esi(struct attr *attr)
{
return attr ? &attr->esi : zero_esi;
}
static inline bool bgp_evpn_attr_is_sync(struct attr *attr)
{
return attr ? !!(attr->es_flags &
(ATTR_ES_PEER_PROXY | ATTR_ES_PEER_ACTIVE)) : false;
}
static inline uint32_t bgp_evpn_attr_get_sync_seq(struct attr *attr)
{
return attr ? attr->mm_sync_seqnum : 0;
}
static inline bool bgp_evpn_attr_is_active_on_peer(struct attr *attr)
{
return attr ?
!!(attr->es_flags & ATTR_ES_PEER_ACTIVE) : false;
}
static inline bool bgp_evpn_attr_is_router_on_peer(struct attr *attr)
{
return attr ?
!!(attr->es_flags & ATTR_ES_PEER_ROUTER) : false;
}
static inline bool bgp_evpn_attr_is_proxy(struct attr *attr)
{
return attr ? !!(attr->es_flags & ATTR_ES_PROXY_ADVERT) : false;
}
static inline bool bgp_evpn_attr_is_local_es(struct attr *attr)
{
return attr ? !!(attr->es_flags & ATTR_ES_IS_LOCAL) : false;
}
static inline uint32_t bgp_evpn_attr_get_df_pref(struct attr *attr)
{
return (attr) ? attr->df_pref : 0;
}
static inline bool bgp_evpn_local_es_is_active(struct bgp_evpn_es *es)
{
return (es->flags & BGP_EVPNES_OPER_UP)
&& !(es->flags & BGP_EVPNES_BYPASS);
}
/****************************************************************************/
extern int bgp_evpn_es_route_install_uninstall(struct bgp *bgp,
struct bgp_evpn_es *es, afi_t afi, safi_t safi,
struct prefix_evpn *evp, struct bgp_path_info *pi,
int install);
extern void update_type1_routes_for_evi(struct bgp *bgp, struct bgpevpn *vpn);
extern int delete_global_ead_evi_routes(struct bgp *bgp, struct bgpevpn *vpn);
extern int bgp_evpn_mh_route_update(struct bgp *bgp, struct bgp_evpn_es *es,
struct bgpevpn *vpn, afi_t afi, safi_t safi,
struct bgp_dest *dest, struct attr *attr,
struct bgp_path_info **ri,
int *route_changed);
int bgp_evpn_type1_route_process(struct peer *peer, afi_t afi, safi_t safi,
struct attr *attr, uint8_t *pfx, int psize,
uint32_t addpath_id);
int bgp_evpn_type4_route_process(struct peer *peer, afi_t afi, safi_t safi,
struct attr *attr, uint8_t *pfx, int psize,
uint32_t addpath_id);
extern int bgp_evpn_local_es_add(struct bgp *bgp, esi_t *esi,
struct in_addr originator_ip, bool oper_up,
uint16_t df_pref, bool bypass);
extern int bgp_evpn_local_es_del(struct bgp *bgp, esi_t *esi);
extern int bgp_evpn_local_es_evi_add(struct bgp *bgp, esi_t *esi, vni_t vni);
extern int bgp_evpn_local_es_evi_del(struct bgp *bgp, esi_t *esi, vni_t vni);
extern int bgp_evpn_remote_es_evi_add(struct bgp *bgp, struct bgpevpn *vpn,
const struct prefix_evpn *p);
extern int bgp_evpn_remote_es_evi_del(struct bgp *bgp, struct bgpevpn *vpn,
const struct prefix_evpn *p);
extern void bgp_evpn_mh_init(void);
extern void bgp_evpn_mh_finish(void);
void bgp_evpn_vni_es_init(struct bgpevpn *vpn);
void bgp_evpn_vni_es_cleanup(struct bgpevpn *vpn);
void bgp_evpn_es_show_esi(struct vty *vty, esi_t *esi, bool uj);
void bgp_evpn_es_show(struct vty *vty, bool uj, bool detail);
void bgp_evpn_es_evi_show_vni(struct vty *vty, vni_t vni,
bool uj, bool detail);
void bgp_evpn_es_evi_show(struct vty *vty, bool uj, bool detail);
struct bgp_evpn_es *bgp_evpn_es_find(const esi_t *esi);
extern void bgp_evpn_vrf_es_init(struct bgp *bgp_vrf);
extern bool bgp_evpn_is_esi_local_and_non_bypass(esi_t *esi);
extern void bgp_evpn_es_vrf_deref(struct bgp_evpn_es_evi *es_evi);
extern void bgp_evpn_es_vrf_ref(struct bgp_evpn_es_evi *es_evi,
struct bgp *bgp_vrf);
extern void bgp_evpn_path_mh_info_free(struct bgp_path_mh_info *mh_info);
extern void bgp_evpn_path_es_link(struct bgp_path_info *pi, vni_t vni,
esi_t *esi);
extern bool bgp_evpn_path_es_use_nhg(struct bgp *bgp_vrf,
struct bgp_path_info *pi, uint32_t *nhg_p);
extern void bgp_evpn_es_vrf_show(struct vty *vty, bool uj,
struct bgp_evpn_es *es);
extern void bgp_evpn_es_vrf_show_esi(struct vty *vty, esi_t *esi, bool uj);
extern void bgp_evpn_switch_ead_evi_rx(void);
extern bool bgp_evpn_es_add_l3_ecomm_ok(esi_t *esi);
extern void bgp_evpn_es_vrf_use_nhg(struct bgp *bgp_vrf, esi_t *esi,
bool *use_l3nhg, bool *is_l3nhg_active,
struct bgp_evpn_es_vrf **es_vrf_p);
extern void bgp_evpn_nh_init(struct bgp *bgp_vrf);
extern void bgp_evpn_nh_finish(struct bgp *bgp_vrf);
extern void bgp_evpn_nh_show(struct vty *vty, bool uj);
extern void bgp_evpn_path_nh_add(struct bgp *bgp_vrf, struct bgp_path_info *pi);
extern void bgp_evpn_path_nh_del(struct bgp *bgp_vrf, struct bgp_path_info *pi);
extern void bgp_evpn_mh_config_ead_export_rt(struct bgp *bgp,
struct ecommunity *ecom, bool del);
#endif /* _FRR_BGP_EVPN_MH_H */
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