4 files changed, 25 insertions, 5 deletions
diff --git a/src/network/networkd-address.c b/src/network/networkd-address.c
index 255ff77022..85acc49945 100644
--- a/src/network/networkd-address.c
+++ b/src/network/networkd-address.c
@@ -209,10 +209,18 @@ int address_update(Address *address, Link *link,
         if (r < 0)
                 return log_error_errno(r, "Could not set prefixlen: %m");
 
-        r = sd_rtnl_message_addr_set_flags(req, IFA_F_PERMANENT);
+        address->flags |= IFA_F_PERMANENT;
+
+        r = sd_rtnl_message_addr_set_flags(req, address->flags & 0xff);
         if (r < 0)
                 return log_error_errno(r, "Could not set flags: %m");
 
+        if (address->flags & ~0xff) {
+                r = sd_rtnl_message_append_u32(req, IFA_FLAGS, address->flags);
+                if (r < 0)
+                        return log_error_errno(r, "Could not set extended flags: %m");
+        }
+
         r = sd_rtnl_message_addr_set_scope(req, address->scope);
         if (r < 0)
                 return log_error_errno(r, "Could not set scope: %m");
@@ -335,10 +343,18 @@ int address_configure(Address *address, Link *link,
         if (r < 0)
                 return log_error_errno(r, "Could not set prefixlen: %m");
 
-        r = sd_rtnl_message_addr_set_flags(req, IFA_F_PERMANENT);
+        address->flags |= IFA_F_PERMANENT;
+
+        r = sd_rtnl_message_addr_set_flags(req, (address->flags & 0xff));
         if (r < 0)
                 return log_error_errno(r, "Could not set flags: %m");
 
+        if (address->flags & ~0xff) {
+                r = sd_rtnl_message_append_u32(req, IFA_FLAGS, address->flags);
+                if (r < 0)
+                        return log_error_errno(r, "Could not set extended flags: %m");
+        }
+
         r = sd_rtnl_message_addr_set_scope(req, address->scope);
         if (r < 0)
                 return log_error_errno(r, "Could not set scope: %m");
diff --git a/src/network/networkd-dhcp6.c b/src/network/networkd-dhcp6.c
index bcfad4c03f..283a7d6992 100644
--- a/src/network/networkd-dhcp6.c
+++ b/src/network/networkd-dhcp6.c
@@ -65,7 +65,9 @@ static int dhcp6_address_update(Link *link, struct in6_addr *ip6_addr,
 
         addr->family = AF_INET6;
         memcpy(&addr->in_addr.in6, ip6_addr, sizeof(*ip6_addr));
-        addr->prefixlen = prefixlen;
+
+        addr->flags = IFA_F_NOPREFIXROUTE;
+        addr->prefixlen = 64;
 
         addr->cinfo.ifa_prefered = lifetime_preferred;
         addr->cinfo.ifa_valid = lifetime_valid;
diff --git a/src/network/networkd-link.c b/src/network/networkd-link.c
index 842ca1ce6e..437c59843e 100644
--- a/src/network/networkd-link.c
+++ b/src/network/networkd-link.c
@@ -1831,6 +1831,7 @@ int link_rtnl_process_address(sd_rtnl *rtnl, sd_rtnl_message *message, void *use
         Link *link = NULL;
         uint16_t type;
         _cleanup_address_free_ Address *address = NULL;
+        unsigned char flags;
         Address *existing;
         char buf[INET6_ADDRSTRLEN], valid_buf[FORMAT_TIMESPAN_MAX];
         const char *valid_str = NULL;
@@ -1894,11 +1895,12 @@ int link_rtnl_process_address(sd_rtnl *rtnl, sd_rtnl_message *message, void *use
                 return 0;
         }
 
-        r = sd_rtnl_message_addr_get_flags(message, &address->flags);
+        r = sd_rtnl_message_addr_get_flags(message, &flags);
         if (r < 0) {
                 log_link_warning(link, "rtnl: received address with invalid flags, ignoring");
                 return 0;
         }
+        address->flags = flags;
 
         switch (address->family) {
         case AF_INET:
diff --git a/src/network/networkd.h b/src/network/networkd.h
index 8bdc2bed82..c26d64e383 100644
--- a/src/network/networkd.h
+++ b/src/network/networkd.h
@@ -173,7 +173,7 @@ struct Address {
         int family;
         unsigned char prefixlen;
         unsigned char scope;
-        unsigned char flags;
+        uint32_t flags;
         char *label;
 
         struct in_addr broadcast;