From: Donald Sharp <sharpd@cumulusnetworks.com>
Date: Thu, 21 Feb 2019 21:10:56 +0000 (-0500)
Subject: zebra: Re-evaluate the nexthop tracking if flags changed
X-Git-Url: https://git.puffer.fish/?a=commitdiff_plain;h=5eb3bf5d69daa220a848d9e6f771b7849f9b68e4;p=matthieu%2Ffrr.git

zebra: Re-evaluate the nexthop tracking if flags changed

Routing protocols are allowed ( and even encouraged ) to modify
the flags that influence the nexthop tracking.  As such when
we modify the tracking of a nexthop to go from, say, connected force
or not we must re-evaluate the nexthop and send the results
up to the interested parties.

Signed-off-by: Donald Sharp <sharpd@cumulusnetworks.com>
Signed-off-by: Donatas Abraitis <donatas.abraitis@gmail.com>
---

diff --git a/zebra/zapi_msg.c b/zebra/zapi_msg.c
index 1875fa5257..2cfd954567 100644
--- a/zebra/zapi_msg.c
+++ b/zebra/zapi_msg.c
@@ -1039,6 +1039,8 @@ static void zread_rnh_register(ZAPI_HANDLER_ARGS)
 	uint8_t flags = 0;
 	uint16_t type = cmd2type[hdr->command];
 	bool exist;
+	bool flag_changed = false;
+	uint8_t orig_flags;
 
 	if (IS_ZEBRA_DEBUG_NHT)
 		zlog_debug(
@@ -1087,6 +1089,7 @@ static void zread_rnh_register(ZAPI_HANDLER_ARGS)
 		if (!rnh)
 			return;
 
+		orig_flags = rnh->flags;
 		if (type == RNH_NEXTHOP_TYPE) {
 			if (flags
 			    && !CHECK_FLAG(rnh->flags, ZEBRA_NHT_CONNECTED))
@@ -1104,9 +1107,12 @@ static void zread_rnh_register(ZAPI_HANDLER_ARGS)
 				UNSET_FLAG(rnh->flags, ZEBRA_NHT_EXACT_MATCH);
 		}
 
+		if (orig_flags != rnh->flags)
+			flag_changed = true;
+
 		zebra_add_rnh_client(rnh, client, type, zvrf_id(zvrf));
 		/* Anything not AF_INET/INET6 has been filtered out above */
-		if (!exist)
+		if (!exist || flag_changed)
 			zebra_evaluate_rnh(zvrf, p.family, 1, type, &p);
 	}