Add SPDX identifiers

Software Package Data Exchange identifiers help to detect source file
licenses and hence simplify the FOSS compliance process.

Signed-off-by: Yegor Yefremov <yegorslists@googlemail.com>

https://github.com/thom311/libnl/pull/219

---

FILES=(
  lib/addr.c
  lib/attr.c
  lib/cache.c
  lib/cache_mngr.c
  lib/cache_mngt.c
  lib/data.c
  lib/error.c
  lib/fib_lookup/lookup.c
  lib/fib_lookup/request.c
  lib/genl/ctrl.c
  lib/genl/family.c
  lib/genl/genl.c
  lib/genl/mngt.c
  lib/handlers.c
  lib/hash.c
  lib/hashtable.c
  lib/idiag/idiag.c
  lib/idiag/idiag_meminfo_obj.c
  lib/idiag/idiag_msg_obj.c
  lib/idiag/idiag_req_obj.c
  lib/idiag/idiag_vegasinfo_obj.c
  lib/mpls.c
  lib/msg.c
  lib/netfilter/ct.c
  lib/netfilter/ct_obj.c
  lib/netfilter/exp.c
  lib/netfilter/exp_obj.c
  lib/netfilter/log.c
  lib/netfilter/log_msg.c
  lib/netfilter/log_msg_obj.c
  lib/netfilter/log_obj.c
  lib/netfilter/netfilter.c
  lib/netfilter/nfnl.c
  lib/netfilter/queue.c
  lib/netfilter/queue_msg.c
  lib/netfilter/queue_msg_obj.c
  lib/netfilter/queue_obj.c
  lib/nl.c
  lib/object.c
  lib/route/act.c
  lib/route/addr.c
  lib/route/class.c
  lib/route/classid.c
  lib/route/cls.c
  lib/route/link.c
  lib/route/neigh.c
  lib/route/neightbl.c
  lib/route/netconf.c
  lib/route/nexthop.c
  lib/route/nexthop_encap.c
  lib/route/nh_encap_mpls.c
  lib/route/pktloc.c
  lib/route/qdisc.c
  lib/route/route.c
  lib/route/route_obj.c
  lib/route/route_utils.c
  lib/route/rtnl.c
  lib/route/rule.c
  lib/route/tc.c
  lib/socket.c
  lib/utils.c
  lib/version.c
  lib/xfrm/ae.c
  lib/xfrm/lifetime.c
  lib/xfrm/sa.c
  lib/xfrm/selector.c
  lib/xfrm/sp.c
  lib/xfrm/template.c
  src/genl-ctrl-list.c
  src/idiag-socket-details.c
  src/lib/addr.c
  src/lib/class.c
  src/lib/cls.c
  src/lib/ct.c
  src/lib/exp.c
  src/lib/link.c
  src/lib/neigh.c
  src/lib/qdisc.c
  src/lib/route.c
  src/lib/rule.c
  src/lib/tc.c
  src/lib/utils.c
  src/nf-ct-add.c
  src/nf-ct-events.c
  src/nf-ct-list.c
  src/nf-exp-add.c
  src/nf-exp-delete.c
  src/nf-exp-list.c
  src/nf-log.c
  src/nf-monitor.c
  src/nf-queue.c
  src/nl-addr-add.c
  src/nl-addr-delete.c
  src/nl-addr-list.c
  src/nl-class-add.c
  src/nl-class-delete.c
  src/nl-class-list.c
  src/nl-classid-lookup.c
  src/nl-cls-add.c
  src/nl-cls-delete.c
  src/nl-cls-list.c
  src/nl-fib-lookup.c
  src/nl-link-enslave.c
  src/nl-link-ifindex2name.c
  src/nl-link-list.c
  src/nl-link-name2ifindex.c
  src/nl-link-release.c
  src/nl-link-set.c
  src/nl-link-stats.c
  src/nl-list-caches.c
  src/nl-list-sockets.c
  src/nl-monitor.c
  src/nl-neigh-add.c
  src/nl-neigh-delete.c
  src/nl-neigh-list.c
  src/nl-neightbl-list.c
  src/nl-pktloc-lookup.c
  src/nl-qdisc-add.c
  src/nl-qdisc-delete.c
  src/nl-qdisc-list.c
  src/nl-route-add.c
  src/nl-route-delete.c
  src/nl-route-get.c
  src/nl-route-list.c
  src/nl-rule-list.c
  src/nl-tctree-list.c
  src/nl-util-addr.c
)

sed '1s#^#/* SPDX-License-Identifier: LGPL-2.1-only */\n#' "${FILES[@]}" -i

59 files changed, 59 insertions, 0 deletions

diff --git a/src/genl-ctrl-list.c b/src/genl-ctrl-list.c
index e6d09c3..d3279a8 100644
--- a/src/genl-ctrl-list.c
+++ b/src/genl-ctrl-list.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1-only */
 /*
  * src/genl-ctrl-list.c	List Generic Netlink Families
  *
diff --git a/src/idiag-socket-details.c b/src/idiag-socket-details.c
index 17bcef2..2d7dd4b 100644
--- a/src/idiag-socket-details.c
+++ b/src/idiag-socket-details.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1-only */
 /*
  * src/idiag-socket-details.c     List socket details
  *
diff --git a/src/lib/addr.c b/src/lib/addr.c
index a9c137b..5d39f7c 100644
--- a/src/lib/addr.c
+++ b/src/lib/addr.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1-only */
 /*
  * src/lib/addr.c     Address Helpers
  *
diff --git a/src/lib/class.c b/src/lib/class.c
index 96f60cd..162e542 100644
--- a/src/lib/class.c
+++ b/src/lib/class.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1-only */
 /*
  * src/lib/class.c     CLI Class Helpers
  *
diff --git a/src/lib/cls.c b/src/lib/cls.c
index 86d775d..a5ac925 100644
--- a/src/lib/cls.c
+++ b/src/lib/cls.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1-only */
 /*
  * src/lib/cls.c     	CLI Classifier Helpers
  *
diff --git a/src/lib/ct.c b/src/lib/ct.c
index c903878..e6732ae 100644
--- a/src/lib/ct.c
+++ b/src/lib/ct.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1-only */
 /*
  * src/lib/ct.c		CLI Conntrack Helpers
  *
diff --git a/src/lib/exp.c b/src/lib/exp.c
index a7a74f5..732843f 100644
--- a/src/lib/exp.c
+++ b/src/lib/exp.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1-only */
 /*
  * src/lib/exp.c		CLI Expectation Helpers
  *
diff --git a/src/lib/link.c b/src/lib/link.c
index eb5b54b..ae367e4 100644
--- a/src/lib/link.c
+++ b/src/lib/link.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1-only */
 /*
  * src/lib/link.c     CLI Link Helpers
  *
diff --git a/src/lib/neigh.c b/src/lib/neigh.c
index 4518e46..75862c7 100644
--- a/src/lib/neigh.c
+++ b/src/lib/neigh.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1-only */
 /*
  * src/lib/neigh.c     CLI Neighbour Helpers
  *
diff --git a/src/lib/qdisc.c b/src/lib/qdisc.c
index ccf7d26..ea047c2 100644
--- a/src/lib/qdisc.c
+++ b/src/lib/qdisc.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1-only */
 /*
  * src/lib/qdisc.c     CLI QDisc Helpers
  *
diff --git a/src/lib/route.c b/src/lib/route.c
index 2eac0a0..9d0fbe8 100644
--- a/src/lib/route.c
+++ b/src/lib/route.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1-only */
 /*
  * src/lib/route.c     CLI Route Helpers
  *
diff --git a/src/lib/rule.c b/src/lib/rule.c
index 96f1d4c..213eca2 100644
--- a/src/lib/rule.c
+++ b/src/lib/rule.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1-only */
 /*
  * src/lib/rule.c     CLI Routing Rule Helpers
  *
diff --git a/src/lib/tc.c b/src/lib/tc.c
index dde729f..5d3a203 100644
--- a/src/lib/tc.c
+++ b/src/lib/tc.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1-only */
 /*
  * src/lib/tc.c     CLI Traffic Control Helpers
  *
diff --git a/src/lib/utils.c b/src/lib/utils.c
index 1886159..3aa2a90 100644
--- a/src/lib/utils.c
+++ b/src/lib/utils.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1-only */
 /*
  * src/utils.c		Utilities
  *
diff --git a/src/nf-ct-add.c b/src/nf-ct-add.c
index 0dd2110..eec9b86 100644
--- a/src/nf-ct-add.c
+++ b/src/nf-ct-add.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1-only */
 /*
  * src/nf-ct-add.c     Add Conntrack Entry
  *
diff --git a/src/nf-ct-events.c b/src/nf-ct-events.c
index a9156b4..87f2da9 100644
--- a/src/nf-ct-events.c
+++ b/src/nf-ct-events.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1-only */
 /*
  * src/nf-ct-events.c	  Listen on Conntrack Events
  *
diff --git a/src/nf-ct-list.c b/src/nf-ct-list.c
index 6355d10..c512027 100644
--- a/src/nf-ct-list.c
+++ b/src/nf-ct-list.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1-only */
 /*
  * src/nf-ct-list.c     List Conntrack Entries
  *
diff --git a/src/nf-exp-add.c b/src/nf-exp-add.c
index 68e2ec6..1f71cd5 100644
--- a/src/nf-exp-add.c
+++ b/src/nf-exp-add.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1-only */
 /*
  * src/nf-exp-add.c     Create an expectation
  *
diff --git a/src/nf-exp-delete.c b/src/nf-exp-delete.c
index 43493d5..c6e478c 100644
--- a/src/nf-exp-delete.c
+++ b/src/nf-exp-delete.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1-only */
 /*
  * src/nf-exp-delete.c     Delete an expectation
  *
diff --git a/src/nf-exp-list.c b/src/nf-exp-list.c
index d14b1fa..0993a98 100644
--- a/src/nf-exp-list.c
+++ b/src/nf-exp-list.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1-only */
 /*
  * src/nf-exp-list.c     List Expectation Entries
  *
diff --git a/src/nf-log.c b/src/nf-log.c
index c0fd978..c8a40bf 100644
--- a/src/nf-log.c
+++ b/src/nf-log.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1-only */
 /*
  * src/nf-log.c     Monitor netfilter log events
  *
diff --git a/src/nf-monitor.c b/src/nf-monitor.c
index 0b74473..4afbdb2 100644
--- a/src/nf-monitor.c
+++ b/src/nf-monitor.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1-only */
 /*
  * src/nf-monitor.c     Monitor netfilter events
  *
diff --git a/src/nf-queue.c b/src/nf-queue.c
index de069b0..f46abc2 100644
--- a/src/nf-queue.c
+++ b/src/nf-queue.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1-only */
 /*
  * src/nf-queue.c     Monitor netfilter queue events
  *
diff --git a/src/nl-addr-add.c b/src/nl-addr-add.c
index 0467f67..e6ebefe 100644
--- a/src/nl-addr-add.c
+++ b/src/nl-addr-add.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1-only */
 /*
  * src/nl-addr-add.c     Add addresses
  *
diff --git a/src/nl-addr-delete.c b/src/nl-addr-delete.c
index 0f3ae2f..9d017f4 100644
--- a/src/nl-addr-delete.c
+++ b/src/nl-addr-delete.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1-only */
 /*
  * src/nl-addr-delete.c     Delete addresses
  *
diff --git a/src/nl-addr-list.c b/src/nl-addr-list.c
index f9e4080..c5258bd 100644
--- a/src/nl-addr-list.c
+++ b/src/nl-addr-list.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1-only */
 /*
  * src/nl-addr-list.c     List addresses
  *
diff --git a/src/nl-class-add.c b/src/nl-class-add.c
index bbba619..a1ccf4e 100644
--- a/src/nl-class-add.c
+++ b/src/nl-class-add.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1-only */
 /*
  * src/nl-class-add.c     Add/Update/Replace Traffic Class
  *
diff --git a/src/nl-class-delete.c b/src/nl-class-delete.c
index 4570258..5627821 100644
--- a/src/nl-class-delete.c
+++ b/src/nl-class-delete.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1-only */
 /*
  * src/nl-class-delete.c     Delete Traffic Classes
  *
diff --git a/src/nl-class-list.c b/src/nl-class-list.c
index 4cace9a..0ce4ab2 100644
--- a/src/nl-class-list.c
+++ b/src/nl-class-list.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1-only */
 /*
  * src/nl-class-list.c     List Traffic Classes
  *
diff --git a/src/nl-classid-lookup.c b/src/nl-classid-lookup.c
index b633ab6..4ddc842 100644
--- a/src/nl-classid-lookup.c
+++ b/src/nl-classid-lookup.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1-only */
 /*
  * src/nl-classid-lookup.c     Lookup classid
  *
diff --git a/src/nl-cls-add.c b/src/nl-cls-add.c
index e4a080a..c2ad717 100644
--- a/src/nl-cls-add.c
+++ b/src/nl-cls-add.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1-only */
 /*
  * src/nl-cls-add.c     Add classifier
  *
diff --git a/src/nl-cls-delete.c b/src/nl-cls-delete.c
index 3297992..a2a93a7 100644
--- a/src/nl-cls-delete.c
+++ b/src/nl-cls-delete.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1-only */
 /*
  * src/nl-cls-delete.c     Delete Classifier
  *
diff --git a/src/nl-cls-list.c b/src/nl-cls-list.c
index 2ab3d12..5d4faa0 100644
--- a/src/nl-cls-list.c
+++ b/src/nl-cls-list.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1-only */
 /*
  * src/nl-cls-list.c     	List classifiers
  *
diff --git a/src/nl-fib-lookup.c b/src/nl-fib-lookup.c
index 95e6acd..a649687 100644
--- a/src/nl-fib-lookup.c
+++ b/src/nl-fib-lookup.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1-only */
 /*
  * src/nl-fib-lookup.c		FIB Route Lookup
  *
diff --git a/src/nl-link-enslave.c b/src/nl-link-enslave.c
index 1a75939..4e368c3 100644
--- a/src/nl-link-enslave.c
+++ b/src/nl-link-enslave.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1-only */
 /*
  * src/nl-link-enslave.c     Enslave a link
  *
diff --git a/src/nl-link-ifindex2name.c b/src/nl-link-ifindex2name.c
index c4ed827..0cb3cbe 100644
--- a/src/nl-link-ifindex2name.c
+++ b/src/nl-link-ifindex2name.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1-only */
 /*
  * src/nl-link-ifindex2name.c     Transform a interface index to its name
  *
diff --git a/src/nl-link-list.c b/src/nl-link-list.c
index 47d5c06..d382076 100644
--- a/src/nl-link-list.c
+++ b/src/nl-link-list.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1-only */
 /*
  * src/nl-link-dump.c	Dump link attributes
  *
diff --git a/src/nl-link-name2ifindex.c b/src/nl-link-name2ifindex.c
index 1be1d18..d3e8399 100644
--- a/src/nl-link-name2ifindex.c
+++ b/src/nl-link-name2ifindex.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1-only */
 /*
  * src/nl-link-name2ifindex.c     Transform a interface name to its index
  *
diff --git a/src/nl-link-release.c b/src/nl-link-release.c
index 6f9de0e..abe8cdb 100644
--- a/src/nl-link-release.c
+++ b/src/nl-link-release.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1-only */
 /*
  * src/nl-link-release.c     release a link
  *
diff --git a/src/nl-link-set.c b/src/nl-link-set.c
index a3ff8a1..fc0f5a7 100644
--- a/src/nl-link-set.c
+++ b/src/nl-link-set.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1-only */
 /*
  * src/nl-link-set.c     Set link attributes
  *
diff --git a/src/nl-link-stats.c b/src/nl-link-stats.c
index 82132f8..85719c1 100644
--- a/src/nl-link-stats.c
+++ b/src/nl-link-stats.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1-only */
 /*
  * src/nl-link-stats.c     Retrieve link statistics
  *
diff --git a/src/nl-list-caches.c b/src/nl-list-caches.c
index 853d8a4..c59f95b 100644
--- a/src/nl-list-caches.c
+++ b/src/nl-list-caches.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1-only */
 /*
  * nl-list-caches.c	List registered cache types
  *
diff --git a/src/nl-list-sockets.c b/src/nl-list-sockets.c
index 74957de..e7d4703 100644
--- a/src/nl-list-sockets.c
+++ b/src/nl-list-sockets.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1-only */
 /*
  * nl-list-sockets.c	Pretty-print /proc/net/netlink
  *
diff --git a/src/nl-monitor.c b/src/nl-monitor.c
index 4400df5..a6f21b4 100644
--- a/src/nl-monitor.c
+++ b/src/nl-monitor.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1-only */
 /*
  * src/nl-monitor.c     Monitor events
  *
diff --git a/src/nl-neigh-add.c b/src/nl-neigh-add.c
index d98330b..585639a 100644
--- a/src/nl-neigh-add.c
+++ b/src/nl-neigh-add.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1-only */
 /*
  * src/ nl-neigh-add.c     Add a neighbour
  *
diff --git a/src/nl-neigh-delete.c b/src/nl-neigh-delete.c
index 2d3be37..826c1c5 100644
--- a/src/nl-neigh-delete.c
+++ b/src/nl-neigh-delete.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1-only */
 /*
  * src/nl-neigh-delete.c     Delete a neighbour
  *
diff --git a/src/nl-neigh-list.c b/src/nl-neigh-list.c
index 1581e17..a926208 100644
--- a/src/nl-neigh-list.c
+++ b/src/nl-neigh-list.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1-only */
 /*
  * src/nl-neigh-list.c      List Neighbours
  *
diff --git a/src/nl-neightbl-list.c b/src/nl-neightbl-list.c
index 5c28e91..10d7ed4 100644
--- a/src/nl-neightbl-list.c
+++ b/src/nl-neightbl-list.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1-only */
 /*
  * src/nl-neightbl-list.c     Dump neighbour tables
  *
diff --git a/src/nl-pktloc-lookup.c b/src/nl-pktloc-lookup.c
index 68dbdf9..8b1272c 100644
--- a/src/nl-pktloc-lookup.c
+++ b/src/nl-pktloc-lookup.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1-only */
 /*
  * src/nl-pktloc-lookup.c     Lookup packet location alias
  *
diff --git a/src/nl-qdisc-add.c b/src/nl-qdisc-add.c
index dc0b4f1..38903f3 100644
--- a/src/nl-qdisc-add.c
+++ b/src/nl-qdisc-add.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1-only */
 /*
  * src/nl-qdisc-add.c     Add Queueing Discipline
  *
diff --git a/src/nl-qdisc-delete.c b/src/nl-qdisc-delete.c
index 4a63a7e..7c5926b 100644
--- a/src/nl-qdisc-delete.c
+++ b/src/nl-qdisc-delete.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1-only */
 /*
  * src/nl-qdisc-delete.c     Delete Queuing Disciplines
  *
diff --git a/src/nl-qdisc-list.c b/src/nl-qdisc-list.c
index eb73e5f..6796ca5 100644
--- a/src/nl-qdisc-list.c
+++ b/src/nl-qdisc-list.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1-only */
 /*
  * src/nl-qdisc-list.c     List Queueing Disciplines
  *
diff --git a/src/nl-route-add.c b/src/nl-route-add.c
index 3a2dd61..ed2c4e2 100644
--- a/src/nl-route-add.c
+++ b/src/nl-route-add.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1-only */
 /*
  * src/nl-route-add.c     Route addition utility
  *
diff --git a/src/nl-route-delete.c b/src/nl-route-delete.c
index 56d52eb..750b57f 100644
--- a/src/nl-route-delete.c
+++ b/src/nl-route-delete.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1-only */
 /*
  * src/nl-route-delete.c     Delete Routes
  *
diff --git a/src/nl-route-get.c b/src/nl-route-get.c
index b031ae4..564fc16 100644
--- a/src/nl-route-get.c
+++ b/src/nl-route-get.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1-only */
 /*
  * src/nl-route-get.c     Get Route Attributes
  *
diff --git a/src/nl-route-list.c b/src/nl-route-list.c
index 06ef01a..b6c4270 100644
--- a/src/nl-route-list.c
+++ b/src/nl-route-list.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1-only */
 /*
  * src/nl-route-list.c     List route attributes
  *
diff --git a/src/nl-rule-list.c b/src/nl-rule-list.c
index ec73aca..b923184 100644
--- a/src/nl-rule-list.c
+++ b/src/nl-rule-list.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1-only */
 /*
  * src/nl-rule-dump.c     Dump rule attributes
  *
diff --git a/src/nl-tctree-list.c b/src/nl-tctree-list.c
index 7c3b7e6..c80093b 100644
--- a/src/nl-tctree-list.c
+++ b/src/nl-tctree-list.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1-only */
 /*
  * src/nl-tctree-list.c		List Traffic Control Tree
  *
diff --git a/src/nl-util-addr.c b/src/nl-util-addr.c
index 5f0738d..6a81166 100644
--- a/src/nl-util-addr.c
+++ b/src/nl-util-addr.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1-only */
 /*
  * src/nl-util-addr.c     Address Helper
  *