From: Yu Watanabe <watanabe.yu+github@gmail.com>
Date: Mon, 21 Jun 2021 19:11:15 +0000 (+0900)
Subject: network: ipv4ll: refuse to configure IPv4LL address on interface where the length... 
X-Git-Tag: v249-rc3~17^2~10
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=a1e35fca46681eab34608377b04d77f68128483a;p=thirdparty%2Fsystemd.git

network: ipv4ll: refuse to configure IPv4LL address on interface where the length of the hardware address is not ETH_ALEN

Currently, sd-ipv4acd assumes hardware address is ETH_ALEN.
---

diff --git a/src/network/networkd-link.c b/src/network/networkd-link.c
index 378420d9d3e..ba1bd283df7 100644
--- a/src/network/networkd-link.c
+++ b/src/network/networkd-link.c
@@ -74,6 +74,12 @@ bool link_ipv4ll_enabled(Link *link) {
         if (link->iftype == ARPHRD_CAN)
                 return false;
 
+        if (link->hw_addr.length != ETH_ALEN)
+                return false;
+
+        if (ether_addr_is_null(&link->hw_addr.ether))
+                return false;
+
         if (STRPTR_IN_SET(link->kind,
                           "vrf", "wireguard", "ipip", "gre", "ip6gre","ip6tnl", "sit", "vti",
                           "vti6", "nlmon", "xfrm", "bareudp"))