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/* BGP Nexthop tracking
* Copyright (C) 2013 Cumulus Networks, Inc.
*
* This file is part of GNU Zebra.
*
* GNU Zebra 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.
*
* GNU Zebra 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
*/
#ifndef _BGP_NHT_H
#define _BGP_NHT_H
/**
* bgp_parse_nexthop_update() - parse a nexthop update message from Zebra.
*/
extern void bgp_parse_nexthop_update(int command, vrf_id_t vrf_id);
/**
* bgp_find_or_add_nexthop() - lookup the nexthop cache table for the bnc
* object. If not found, create a new object and register with ZEBRA for
* nexthop notification.
* ARGUMENTS:
* bgp_route - BGP instance of route
* bgp_nexthop - BGP instance of nexthop
* a - afi: AFI_IP or AF_IP6
* safi - safi: to check which table nhs are being imported to
* p - path for which the nexthop object is being looked up
* peer - The BGP peer associated with this NHT
* connected - True if NH MUST be a connected route
*/
extern int bgp_find_or_add_nexthop(struct bgp *bgp_route,
struct bgp *bgp_nexthop, afi_t a,
safi_t safi, struct bgp_path_info *p,
struct peer *peer, int connected,
const struct prefix *orig_prefix);
/**
* bgp_unlink_nexthop() - Unlink the nexthop object from the path structure.
* ARGUMENTS:
* p - path structure.
*/
extern void bgp_unlink_nexthop(struct bgp_path_info *p);
void bgp_unlink_nexthop_by_peer(struct peer *peer);
void bgp_replace_nexthop_by_peer(struct peer *from, struct peer *to);
/**
* bgp_delete_connected_nexthop() - Reset the 'peer' pointer for a connected
* nexthop entry. If no paths reference the nexthop, it will be unregistered
* and freed.
* ARGUMENTS:
* afi - afi: AFI_IP or AF_IP6
* peer - Ptr to peer
*/
extern void bgp_delete_connected_nexthop(afi_t afi, struct peer *peer);
/*
* Cleanup nexthop registration and status information for BGP nexthops
* pertaining to this VRF. This is invoked upon VRF deletion.
*/
extern void bgp_cleanup_nexthops(struct bgp *bgp);
/*
* Add or remove the tracking of the bgp_path_info that
* uses this nexthop
*/
extern void path_nh_map(struct bgp_path_info *path,
struct bgp_nexthop_cache *bnc, bool make);
/*
* When we actually have the connection to
* the zebra daemon, we need to reregister
* any nexthops we may have sitting around
*/
extern void bgp_nht_register_nexthops(struct bgp *bgp);
/*
* When we have the the PEER_FLAG_CAPABILITY_ENHE flag
* set on a peer *after* it has been brought up we need
* to notice and setup the interface based RA,
* this code can walk the registered nexthops and
* register the important ones with zebra for RA.
*/
extern void bgp_nht_reg_enhe_cap_intfs(struct peer *peer);
extern void bgp_nht_dereg_enhe_cap_intfs(struct peer *peer);
extern void evaluate_paths(struct bgp_nexthop_cache *bnc);
/* APIs for setting up and allocating L3 nexthop group ids */
extern uint32_t bgp_l3nhg_id_alloc(void);
extern void bgp_l3nhg_id_free(uint32_t nhg_id);
extern void bgp_l3nhg_init(void);
void bgp_l3nhg_finish(void);
extern void bgp_nht_ifp_up(struct interface *ifp);
extern void bgp_nht_ifp_down(struct interface *ifp);
extern void bgp_nht_interface_events(struct peer *peer);
#endif /* _BGP_NHT_H */
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