From 09ee846d9275b4cb0b77f7e458aba6a71b111c52 Mon Sep 17 00:00:00 2001
From: "Ondrej Zajicek (work)" <santiago@crfreenet.org>
Date: Sat, 28 Sep 2019 14:17:20 +0200
Subject: BGP: AIGP metric support (RFC 7311)

---
 nest/route.h    |  1 +
 nest/rt-table.c | 14 +++++++++++++-
 2 files changed, 14 insertions(+), 1 deletion(-)

(limited to 'nest')

diff --git a/nest/route.h b/nest/route.h
index f4f32ce0..cd4b75db 100644
--- a/nest/route.h
+++ b/nest/route.h
@@ -652,6 +652,7 @@ void rta_dump(rta *);
 void rta_dump_all(void);
 void rta_show(struct cli *, rta *);
 
+u32 rt_get_igp_metric(rte *rt);
 struct hostentry * rt_get_hostentry(rtable *tab, ip_addr a, ip_addr ll, rtable *dep);
 void rta_apply_hostentry(rta *a, struct hostentry *he, mpls_label_stack *mls);
 
diff --git a/nest/rt-table.c b/nest/rt-table.c
index c3ec0314..b55bcd40 100644
--- a/nest/rt-table.c
+++ b/nest/rt-table.c
@@ -44,6 +44,10 @@
 #include "lib/string.h"
 #include "lib/alloca.h"
 
+#ifdef CONFIG_BGP
+#include "proto/bgp/bgp.h"
+#endif
+
 pool *rt_table_pool;
 
 static slab *rte_slab;
@@ -2934,7 +2938,7 @@ if_local_addr(ip_addr a, struct iface *i)
   return 0;
 }
 
-static u32
+u32
 rt_get_igp_metric(rte *rt)
 {
   eattr *ea = ea_find(rt->attrs->eattrs, EA_GEN_IGP_METRIC);
@@ -2956,6 +2960,14 @@ rt_get_igp_metric(rte *rt)
     return rt->u.rip.metric;
 #endif
 
+#ifdef CONFIG_BGP
+  if (a->source == RTS_BGP)
+  {
+    u64 metric = bgp_total_aigp_metric(rt);
+    return (u32) MIN(metric, (u64) IGP_METRIC_UNKNOWN);
+  }
+#endif
+
   if (a->source == RTS_DEVICE)
     return 0;
 
-- 
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