1 files changed, 91 insertions, 0 deletions
diff --git a/bgpd/bgp_nht.h b/bgpd/bgp_nht.h
new file mode 100644
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+++ b/bgpd/bgp_nht.h
@@ -0,0 +1,91 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/* BGP Nexthop tracking
+ * Copyright (C) 2013 Cumulus Networks, Inc.
+ */
+
+#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 */