From c4d488788a3ed8fba3e75c9ddd632d1f98e9ac77 Mon Sep 17 00:00:00 2001
From: =?utf8?q?Pali=20Roh=C3=A1r?= <pali@kernel.org>
Date: Sun, 10 Jan 2021 18:51:23 +0100
Subject: [PATCH] pppd: Fix setting flags of IPv6 peer address
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Address is link-local (not globaly routable) and is permanent (not dynamic
from stateless address configuration).

Signed-off-by: Pali Rohár <pali@kernel.org>
---
 pppd/sys-linux.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/pppd/sys-linux.c b/pppd/sys-linux.c
index 50c4f2d..a7508fe 100644
--- a/pppd/sys-linux.c
+++ b/pppd/sys-linux.c
@@ -2885,8 +2885,8 @@ static int append_peer_ipv6_address(unsigned int iface, struct in6_addr *local_a
     ifa = NLMSG_DATA(nlmsg);
     ifa->ifa_family = AF_INET6;
     ifa->ifa_prefixlen = 128;
-    ifa->ifa_flags = 0;
-    ifa->ifa_scope = RT_SCOPE_UNIVERSE;
+    ifa->ifa_flags = IFA_F_PERMANENT;
+    ifa->ifa_scope = RT_SCOPE_LINK;
     ifa->ifa_index = iface;
 
     local_rta = IFA_RTA(ifa);
-- 
2.39.2