From: Yu Watanabe <watanabe.yu+github@gmail.com>
Date: Tue, 15 Jun 2021 21:54:47 +0000 (+0900)
Subject: network: always enable IPv4 ACD for statically configured IPv4LL address
X-Git-Tag: v249-rc2~53^2
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=1cf4ed142d6c1e2b9dc6a0bc74b6a83ae30b0f8e;p=thirdparty%2Fsystemd.git

network: always enable IPv4 ACD for statically configured IPv4LL address
---

diff --git a/src/network/networkd-address.c b/src/network/networkd-address.c
index afcbb12473b..04ad2aa69d4 100644
--- a/src/network/networkd-address.c
+++ b/src/network/networkd-address.c
@@ -2115,6 +2115,13 @@ static int address_section_verify(Address *address) {
             !FLAGS_SET(address->duplicate_address_detection, ADDRESS_FAMILY_IPV6))
                 address->flags |= IFA_F_NODAD;
 
+        if (address->family == AF_INET && in4_addr_is_link_local(&address->in_addr.in) &&
+            !FLAGS_SET(address->duplicate_address_detection, ADDRESS_FAMILY_IPV4)) {
+                log_debug("%s: An IPv4 link-local address is specified, enabling IPv4 Address Conflict Detection (ACD).",
+                          address->section->filename);
+                address->duplicate_address_detection |= ADDRESS_FAMILY_IPV4;
+        }
+
         return 0;
 }