1 files changed, 82 insertions, 0 deletions
diff --git a/bgpd/bgp_mpath.h b/bgpd/bgp_mpath.h
new file mode 100644
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--- /dev/null
+++ b/bgpd/bgp_mpath.h
@@ -0,0 +1,82 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * BGP Multipath
+ * Copyright (C) 2010 Google Inc.
+ *
+ * This file is part of Quagga
+ */
+
+#ifndef _FRR_BGP_MPATH_H
+#define _FRR_BGP_MPATH_H
+
+/* Supplemental information linked to bgp_path_info for keeping track of
+ * multipath selections, lazily allocated to save memory
+ */
+struct bgp_path_info_mpath {
+	/* Points to the first multipath (on bestpath) or the next multipath */
+	struct bgp_path_info_mpath *mp_next;
+
+	/* Points to the previous multipath or NULL on bestpath */
+	struct bgp_path_info_mpath *mp_prev;
+
+	/* Points to bgp_path_info associated with this multipath info */
+	struct bgp_path_info *mp_info;
+
+	/* When attached to best path, the number of selected multipaths */
+	uint16_t mp_count;
+
+	/* Flags - relevant as noted. */
+	uint16_t mp_flags;
+#define BGP_MP_LB_PRESENT 0x1 /* Link-bandwidth present for >= 1 path */
+#define BGP_MP_LB_ALL 0x2 /* Link-bandwidth present for all multipaths */
+
+	/* Aggregated attribute for advertising multipath route */
+	struct attr *mp_attr;
+
+	/* Cumulative bandiwdth of all multipaths - attached to best path. */
+	uint64_t cum_bw;
+};
+
+/* Functions to support maximum-paths configuration */
+extern int bgp_maximum_paths_set(struct bgp *bgp, afi_t afi, safi_t safi,
+				 int peertype, uint16_t maxpaths,
+				 bool clusterlen);
+extern int bgp_maximum_paths_unset(struct bgp *bgp, afi_t afi, safi_t safi,
+				   int peertype);
+
+/* Functions used by bgp_best_selection to record current
+ * multipath selections
+ */
+extern int bgp_path_info_nexthop_cmp(struct bgp_path_info *bpi1,
+				     struct bgp_path_info *bpi2);
+extern void bgp_mp_list_init(struct list *mp_list);
+extern void bgp_mp_list_clear(struct list *mp_list);
+extern void bgp_mp_list_add(struct list *mp_list, struct bgp_path_info *mpinfo);
+extern void bgp_mp_dmed_deselect(struct bgp_path_info *dmed_best);
+extern void bgp_path_info_mpath_update(struct bgp *bgp, struct bgp_dest *dest,
+				       struct bgp_path_info *new_best,
+				       struct bgp_path_info *old_best,
+				       struct list *mp_list,
+				       struct bgp_maxpaths_cfg *mpath_cfg);
+extern void
+bgp_path_info_mpath_aggregate_update(struct bgp_path_info *new_best,
+				     struct bgp_path_info *old_best);
+
+/* Unlink and free multipath information associated with a bgp_path_info */
+extern void bgp_path_info_mpath_dequeue(struct bgp_path_info *path);
+extern void bgp_path_info_mpath_free(struct bgp_path_info_mpath **mpath);
+
+/* Walk list of multipaths associated with a best path */
+extern struct bgp_path_info *
+bgp_path_info_mpath_first(struct bgp_path_info *path);
+extern struct bgp_path_info *
+bgp_path_info_mpath_next(struct bgp_path_info *path);
+
+/* Accessors for multipath information */
+extern uint32_t bgp_path_info_mpath_count(struct bgp_path_info *path);
+extern struct attr *bgp_path_info_mpath_attr(struct bgp_path_info *path);
+extern bool bgp_path_info_mpath_chkwtd(struct bgp *bgp,
+				       struct bgp_path_info *path);
+extern uint64_t bgp_path_info_mpath_cumbw(struct bgp_path_info *path);
+
+#endif /* _FRR_BGP_MPATH_H */