Add SPDX license identifiers to source files under the LGPL

This follows what the kernel is doing, c.f.
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=5fd54ace4721fc5ce2bb5aef6318fcf17f421460.

75 files changed, 75 insertions, 0 deletions

diff --git a/src/network/netdev/bond.c b/src/network/netdev/bond.c
index 19b0e8da40..f6c9cebda3 100644
--- a/src/network/netdev/bond.c
+++ b/src/network/netdev/bond.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
 /***
     This file is part of systemd.
 
diff --git a/src/network/netdev/bond.h b/src/network/netdev/bond.h
index fb88b538ed..31be5b83a3 100644
--- a/src/network/netdev/bond.h
+++ b/src/network/netdev/bond.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
 #pragma once
 
 /***
diff --git a/src/network/netdev/bridge.c b/src/network/netdev/bridge.c
index 17c3955ef5..00d4d30a67 100644
--- a/src/network/netdev/bridge.c
+++ b/src/network/netdev/bridge.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
 /***
     This file is part of systemd.
 
diff --git a/src/network/netdev/bridge.h b/src/network/netdev/bridge.h
index b303cfd3f3..7fc993bb8d 100644
--- a/src/network/netdev/bridge.h
+++ b/src/network/netdev/bridge.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
 #pragma once
 
 /***
diff --git a/src/network/netdev/dummy.c b/src/network/netdev/dummy.c
index 5e6e162931..c55009092a 100644
--- a/src/network/netdev/dummy.c
+++ b/src/network/netdev/dummy.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
 /***
     This file is part of systemd.
 
diff --git a/src/network/netdev/dummy.h b/src/network/netdev/dummy.h
index a908400459..abfb7c71ef 100644
--- a/src/network/netdev/dummy.h
+++ b/src/network/netdev/dummy.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
 #pragma once
 
 /***
diff --git a/src/network/netdev/geneve.c b/src/network/netdev/geneve.c
index e71ea58a10..1d50963e04 100644
--- a/src/network/netdev/geneve.c
+++ b/src/network/netdev/geneve.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
 /***
     This file is part of systemd.
 
diff --git a/src/network/netdev/geneve.h b/src/network/netdev/geneve.h
index bde28bac55..9aec8f505b 100644
--- a/src/network/netdev/geneve.h
+++ b/src/network/netdev/geneve.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
 #pragma once
 
 /***
diff --git a/src/network/netdev/ipvlan.c b/src/network/netdev/ipvlan.c
index 3b5c30fed8..df9487418b 100644
--- a/src/network/netdev/ipvlan.c
+++ b/src/network/netdev/ipvlan.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
 /***
   This file is part of systemd.
 
diff --git a/src/network/netdev/ipvlan.h b/src/network/netdev/ipvlan.h
index 7d7d0184f1..cb43db4348 100644
--- a/src/network/netdev/ipvlan.h
+++ b/src/network/netdev/ipvlan.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
 #pragma once
 
 /***
diff --git a/src/network/netdev/macvlan.c b/src/network/netdev/macvlan.c
index 93f650def5..9924e16055 100644
--- a/src/network/netdev/macvlan.c
+++ b/src/network/netdev/macvlan.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
 /***
   This file is part of systemd.
 
diff --git a/src/network/netdev/macvlan.h b/src/network/netdev/macvlan.h
index 118d55658c..7d6d346438 100644
--- a/src/network/netdev/macvlan.h
+++ b/src/network/netdev/macvlan.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
 #pragma once
 
 /***
diff --git a/src/network/netdev/netdev.c b/src/network/netdev/netdev.c
index 2ec526e636..f148bb43c3 100644
--- a/src/network/netdev/netdev.c
+++ b/src/network/netdev/netdev.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
 /***
   This file is part of systemd.
 
diff --git a/src/network/netdev/netdev.h b/src/network/netdev/netdev.h
index a961e2ac3b..4605308ac4 100644
--- a/src/network/netdev/netdev.h
+++ b/src/network/netdev/netdev.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
 #pragma once
 
 /***
diff --git a/src/network/netdev/tunnel.c b/src/network/netdev/tunnel.c
index 72b69c3cba..8d6d54d567 100644
--- a/src/network/netdev/tunnel.c
+++ b/src/network/netdev/tunnel.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
 /***
     This file is part of systemd.
 
diff --git a/src/network/netdev/tunnel.h b/src/network/netdev/tunnel.h
index 53690d9075..67f8fe35c7 100644
--- a/src/network/netdev/tunnel.h
+++ b/src/network/netdev/tunnel.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
 #pragma once
 
 /***
diff --git a/src/network/netdev/tuntap.c b/src/network/netdev/tuntap.c
index 3d62808842..4597a7feeb 100644
--- a/src/network/netdev/tuntap.c
+++ b/src/network/netdev/tuntap.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
 /***
     This file is part of systemd.
 
diff --git a/src/network/netdev/tuntap.h b/src/network/netdev/tuntap.h
index 95d3fcf1e9..dbfa3de180 100644
--- a/src/network/netdev/tuntap.h
+++ b/src/network/netdev/tuntap.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
 #pragma once
 
 /***
diff --git a/src/network/netdev/vcan.c b/src/network/netdev/vcan.c
index 7f56702938..780cf91143 100644
--- a/src/network/netdev/vcan.c
+++ b/src/network/netdev/vcan.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
 /***
   This file is part of systemd.
 
diff --git a/src/network/netdev/vcan.h b/src/network/netdev/vcan.h
index 00838b7675..6c4d68e694 100644
--- a/src/network/netdev/vcan.h
+++ b/src/network/netdev/vcan.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
 #pragma once
 
 /***
diff --git a/src/network/netdev/veth.c b/src/network/netdev/veth.c
index 350b59bf03..9220b3200f 100644
--- a/src/network/netdev/veth.c
+++ b/src/network/netdev/veth.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
 /***
     This file is part of systemd.
 
diff --git a/src/network/netdev/veth.h b/src/network/netdev/veth.h
index b00ce476e8..bb2139ff57 100644
--- a/src/network/netdev/veth.h
+++ b/src/network/netdev/veth.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
 #pragma once
 
 /***
diff --git a/src/network/netdev/vlan.c b/src/network/netdev/vlan.c
index 6f41633ead..3a0100d7e6 100644
--- a/src/network/netdev/vlan.c
+++ b/src/network/netdev/vlan.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
 /***
   This file is part of systemd.
 
diff --git a/src/network/netdev/vlan.h b/src/network/netdev/vlan.h
index 780d61262a..c4688d9b13 100644
--- a/src/network/netdev/vlan.h
+++ b/src/network/netdev/vlan.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
 #pragma once
 
 /***
diff --git a/src/network/netdev/vrf.c b/src/network/netdev/vrf.c
index a3b271ca23..5e04bbd272 100644
--- a/src/network/netdev/vrf.c
+++ b/src/network/netdev/vrf.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
 /***
     This file is part of systemd.
 
diff --git a/src/network/netdev/vrf.h b/src/network/netdev/vrf.h
index 06f3c17bc1..58f4ef30a4 100644
--- a/src/network/netdev/vrf.h
+++ b/src/network/netdev/vrf.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
 #pragma once
 
 /***
diff --git a/src/network/netdev/vxlan.c b/src/network/netdev/vxlan.c
index b5b7aec2c0..580e5e6505 100644
--- a/src/network/netdev/vxlan.c
+++ b/src/network/netdev/vxlan.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
 /***
     This file is part of systemd.
 
diff --git a/src/network/netdev/vxlan.h b/src/network/netdev/vxlan.h
index 1eeda022a2..3bb8884380 100644
--- a/src/network/netdev/vxlan.h
+++ b/src/network/netdev/vxlan.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
 #pragma once
 
 /***
diff --git a/src/network/networkctl.c b/src/network/networkctl.c
index e4b95e4195..262b715206 100644
--- a/src/network/networkctl.c
+++ b/src/network/networkctl.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
 /***
   This file is part of systemd.
 
diff --git a/src/network/networkd-address-label.c b/src/network/networkd-address-label.c
index b89995ec44..4fd5fa4f58 100644
--- a/src/network/networkd-address-label.c
+++ b/src/network/networkd-address-label.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
 /***
   This file is part of systemd.
 
diff --git a/src/network/networkd-address-label.h b/src/network/networkd-address-label.h
index 8724ea8cb5..9ddf707763 100644
--- a/src/network/networkd-address-label.h
+++ b/src/network/networkd-address-label.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
 #pragma once
 
 /***
diff --git a/src/network/networkd-address-pool.c b/src/network/networkd-address-pool.c
index a63b925a4a..22582ab9f1 100644
--- a/src/network/networkd-address-pool.c
+++ b/src/network/networkd-address-pool.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
 /***
   This file is part of systemd.
 
diff --git a/src/network/networkd-address-pool.h b/src/network/networkd-address-pool.h
index af30decfe0..1fcff09be9 100644
--- a/src/network/networkd-address-pool.h
+++ b/src/network/networkd-address-pool.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
 #pragma once
 
 /***
diff --git a/src/network/networkd-address.c b/src/network/networkd-address.c
index 214192ffe8..1ed6288ec0 100644
--- a/src/network/networkd-address.c
+++ b/src/network/networkd-address.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
 /***
   This file is part of systemd.
 
diff --git a/src/network/networkd-address.h b/src/network/networkd-address.h
index 3281c6d3c2..3f5dffac4c 100644
--- a/src/network/networkd-address.h
+++ b/src/network/networkd-address.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
 #pragma once
 
 /***
diff --git a/src/network/networkd-brvlan.c b/src/network/networkd-brvlan.c
index fa5d3ee7fa..1755ba1ac2 100644
--- a/src/network/networkd-brvlan.c
+++ b/src/network/networkd-brvlan.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
 /***
   This file is part of systemd.
 
diff --git a/src/network/networkd-brvlan.h b/src/network/networkd-brvlan.h
index b37633f94f..be99436b67 100644
--- a/src/network/networkd-brvlan.h
+++ b/src/network/networkd-brvlan.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
 #pragma once
 
 /***
diff --git a/src/network/networkd-conf.c b/src/network/networkd-conf.c
index 25ec160df8..1f791fcec0 100644
--- a/src/network/networkd-conf.c
+++ b/src/network/networkd-conf.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
 /***
   This file is part of systemd.
 
diff --git a/src/network/networkd-conf.h b/src/network/networkd-conf.h
index 1136975a5e..8d93cff61c 100644
--- a/src/network/networkd-conf.h
+++ b/src/network/networkd-conf.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
 #pragma once
 
 /***
diff --git a/src/network/networkd-dhcp4.c b/src/network/networkd-dhcp4.c
index 0b2f88b706..168dc6ead2 100644
--- a/src/network/networkd-dhcp4.c
+++ b/src/network/networkd-dhcp4.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
 /***
   This file is part of systemd.
 
diff --git a/src/network/networkd-dhcp6.c b/src/network/networkd-dhcp6.c
index ee28d7ac39..e5df3d22b1 100644
--- a/src/network/networkd-dhcp6.c
+++ b/src/network/networkd-dhcp6.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
 /***
   This file is part of systemd.
 
diff --git a/src/network/networkd-fdb.c b/src/network/networkd-fdb.c
index 3d7f4d2b2d..380581e09a 100644
--- a/src/network/networkd-fdb.c
+++ b/src/network/networkd-fdb.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
 /***
   This file is part of systemd.
 
diff --git a/src/network/networkd-fdb.h b/src/network/networkd-fdb.h
index 2d7d28735c..d34d3e5cbd 100644
--- a/src/network/networkd-fdb.h
+++ b/src/network/networkd-fdb.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
 #pragma once
 
 /***
diff --git a/src/network/networkd-ipv4ll.c b/src/network/networkd-ipv4ll.c
index d2b10107b8..e3ebbddfee 100644
--- a/src/network/networkd-ipv4ll.c
+++ b/src/network/networkd-ipv4ll.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
 /***
   This file is part of systemd.
 
diff --git a/src/network/networkd-ipv6-proxy-ndp.c b/src/network/networkd-ipv6-proxy-ndp.c
index 00790c0c13..526db69d5b 100644
--- a/src/network/networkd-ipv6-proxy-ndp.c
+++ b/src/network/networkd-ipv6-proxy-ndp.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
 /***
   This file is part of systemd.
 
diff --git a/src/network/networkd-ipv6-proxy-ndp.h b/src/network/networkd-ipv6-proxy-ndp.h
index f09169f40f..ac24c58637 100644
--- a/src/network/networkd-ipv6-proxy-ndp.h
+++ b/src/network/networkd-ipv6-proxy-ndp.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
 #pragma once
 
 /***
diff --git a/src/network/networkd-link-bus.c b/src/network/networkd-link-bus.c
index c39c648334..2f4850b1a1 100644
--- a/src/network/networkd-link-bus.c
+++ b/src/network/networkd-link-bus.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
 /***
   This file is part of systemd.
 
diff --git a/src/network/networkd-link.c b/src/network/networkd-link.c
index 9cd221eb42..c80389dfb2 100644
--- a/src/network/networkd-link.c
+++ b/src/network/networkd-link.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
 /***
   This file is part of systemd.
 
diff --git a/src/network/networkd-link.h b/src/network/networkd-link.h
index 6479f4a2e5..bffe865f01 100644
--- a/src/network/networkd-link.h
+++ b/src/network/networkd-link.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
 #pragma once
 
 /***
diff --git a/src/network/networkd-lldp-tx.c b/src/network/networkd-lldp-tx.c
index 2de63ce746..b8d160a1f8 100644
--- a/src/network/networkd-lldp-tx.c
+++ b/src/network/networkd-lldp-tx.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
 /***
   This file is part of systemd.
 
diff --git a/src/network/networkd-lldp-tx.h b/src/network/networkd-lldp-tx.h
index 4680c9d950..be7a989226 100644
--- a/src/network/networkd-lldp-tx.h
+++ b/src/network/networkd-lldp-tx.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
 #pragma once
 
 /***
diff --git a/src/network/networkd-manager-bus.c b/src/network/networkd-manager-bus.c
index cbb1b93031..6d57036eb5 100644
--- a/src/network/networkd-manager-bus.c
+++ b/src/network/networkd-manager-bus.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
 /***
   This file is part of systemd.
 
diff --git a/src/network/networkd-manager.c b/src/network/networkd-manager.c
index 574bd0f5cb..fc9ef74016 100644
--- a/src/network/networkd-manager.c
+++ b/src/network/networkd-manager.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
 /***
   This file is part of systemd.
 
diff --git a/src/network/networkd-manager.h b/src/network/networkd-manager.h
index 254aab8452..186cb41891 100644
--- a/src/network/networkd-manager.h
+++ b/src/network/networkd-manager.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
 #pragma once
 
 /***
diff --git a/src/network/networkd-ndisc.c b/src/network/networkd-ndisc.c
index d52b511bb5..162f2ea0b1 100644
--- a/src/network/networkd-ndisc.c
+++ b/src/network/networkd-ndisc.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
 /***
   This file is part of systemd.
 
diff --git a/src/network/networkd-ndisc.h b/src/network/networkd-ndisc.h
index 127126190e..f5eb8cd360 100644
--- a/src/network/networkd-ndisc.h
+++ b/src/network/networkd-ndisc.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
 #pragma once
 
 /***
diff --git a/src/network/networkd-network-bus.c b/src/network/networkd-network-bus.c
index 3b835b52f9..8d3d7236fc 100644
--- a/src/network/networkd-network-bus.c
+++ b/src/network/networkd-network-bus.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
 /***
   This file is part of systemd.
 
diff --git a/src/network/networkd-network.c b/src/network/networkd-network.c
index 3ed82ca3f9..679d7ed36c 100644
--- a/src/network/networkd-network.c
+++ b/src/network/networkd-network.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
 /***
   This file is part of systemd.
 
diff --git a/src/network/networkd-network.h b/src/network/networkd-network.h
index 500325fbd0..4265ba634e 100644
--- a/src/network/networkd-network.h
+++ b/src/network/networkd-network.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
 #pragma once
 
 /***
diff --git a/src/network/networkd-radv.c b/src/network/networkd-radv.c
index 5c807b887a..630e1dc476 100644
--- a/src/network/networkd-radv.c
+++ b/src/network/networkd-radv.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
 /***
   This file is part of systemd.
 
diff --git a/src/network/networkd-radv.h b/src/network/networkd-radv.h
index d59373df9f..f23029935a 100644
--- a/src/network/networkd-radv.h
+++ b/src/network/networkd-radv.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
 #pragma once
 
 /***
diff --git a/src/network/networkd-route.c b/src/network/networkd-route.c
index 163146da60..6139ad3669 100644
--- a/src/network/networkd-route.c
+++ b/src/network/networkd-route.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
 /***
   This file is part of systemd.
 
diff --git a/src/network/networkd-route.h b/src/network/networkd-route.h
index 89d32e9214..ff03a39c0f 100644
--- a/src/network/networkd-route.h
+++ b/src/network/networkd-route.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
 #pragma once
 
 /***
diff --git a/src/network/networkd-routing-policy-rule.c b/src/network/networkd-routing-policy-rule.c
index d37f31a4cf..a2e1e15851 100644
--- a/src/network/networkd-routing-policy-rule.c
+++ b/src/network/networkd-routing-policy-rule.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
 /***
   This file is part of systemd.
 
diff --git a/src/network/networkd-routing-policy-rule.h b/src/network/networkd-routing-policy-rule.h
index d9fd93b9bf..8a019ba1d2 100644
--- a/src/network/networkd-routing-policy-rule.h
+++ b/src/network/networkd-routing-policy-rule.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
 #pragma once
 
 /***
diff --git a/src/network/networkd-util.c b/src/network/networkd-util.c
index 8856e76269..b9c533fcc7 100644
--- a/src/network/networkd-util.c
+++ b/src/network/networkd-util.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
 /***
   This file is part of systemd.
 
diff --git a/src/network/networkd-util.h b/src/network/networkd-util.h
index d5c385bea4..69ea93ad08 100644
--- a/src/network/networkd-util.h
+++ b/src/network/networkd-util.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
 #pragma once
 
 /***
diff --git a/src/network/networkd.c b/src/network/networkd.c
index da2fe44bdd..9243384af8 100644
--- a/src/network/networkd.c
+++ b/src/network/networkd.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
 /***
   This file is part of systemd.
 
diff --git a/src/network/test-network.c b/src/network/test-network.c
index 64d2f23fc1..ff0f272ef6 100644
--- a/src/network/test-network.c
+++ b/src/network/test-network.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
 /***
   This file is part of systemd.
 
diff --git a/src/network/test-networkd-conf.c b/src/network/test-networkd-conf.c
index 0e1a18457d..530bbf8636 100644
--- a/src/network/test-networkd-conf.c
+++ b/src/network/test-networkd-conf.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
 /***
   This file is part of systemd.
 
diff --git a/src/network/wait-online/link.c b/src/network/wait-online/link.c
index bd8578cf93..dfe18bd960 100644
--- a/src/network/wait-online/link.c
+++ b/src/network/wait-online/link.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
 /***
   This file is part of systemd.
 
diff --git a/src/network/wait-online/link.h b/src/network/wait-online/link.h
index c846e60c45..bf8b453c28 100644
--- a/src/network/wait-online/link.h
+++ b/src/network/wait-online/link.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
 #pragma once
 
 /***
diff --git a/src/network/wait-online/manager.c b/src/network/wait-online/manager.c
index d51b0a59d6..f7a3ec8495 100644
--- a/src/network/wait-online/manager.c
+++ b/src/network/wait-online/manager.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
 /***
   This file is part of systemd.
 
diff --git a/src/network/wait-online/manager.h b/src/network/wait-online/manager.h
index 052f6b9780..7a8c4ea473 100644
--- a/src/network/wait-online/manager.h
+++ b/src/network/wait-online/manager.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
 #pragma once
 
 /***
diff --git a/src/network/wait-online/wait-online.c b/src/network/wait-online/wait-online.c
index 268cbdb629..7b13a5d879 100644
--- a/src/network/wait-online/wait-online.c
+++ b/src/network/wait-online/wait-online.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
 
 /***
   This file is part of systemd.