networkd: add preferred source to dhcp4 gateway route

This makes DHCPv4 and IPv4LL coexist peacefully.

[tomegun: apply to both the dhcp routes, use in_addr_is_null() rather than a
separate variable to indicate when prefsrc should be applied]

1 files changed, 1 insertions, 0 deletions

diff --git a/src/network/networkd.h b/src/network/networkd.h
index ab5df1aa3c..c6e6b22c38 100644
--- a/src/network/networkd.h
+++ b/src/network/networkd.h
@@ -150,6 +150,7 @@ struct Route {
 
         union in_addr_union in_addr;
         union in_addr_union dst_addr;
+        union in_addr_union prefsrc_addr;
 
         LIST_FIELDS(Route, routes);
 };