bpf: Dual-license the code as GPL-2.0 OR BSD-2-Clause (update markers)

Relicense most code under the "bpf/" directory as dual-licensed under
the terms of both the GPL 2.0 license and the 2-Clause BSD license.

The files were processed with a sed script, as follows:

    $ cat license.sed
    # C sources and sed scripts that are GPL-2.0
    s=^\(\(#\|//\|/\*\) *SPDX-License-Identifier: \)GPL-2.0\(\( \*/\)\?\)$=\1(GPL-2.0-only OR BSD-2-Clause)\3=
    # License section for ELF objects
    s=\(__attribute__((section("license"), used)).*\)"GPL"=\1"Dual BSD/GPL"=

    $ find bpf -type f -print0 | xargs -0 -P8 sed -i -f ./license.sed

Files in bpf/include were left intact.

The identified contributors, from whom we received no answers to this
date, but whose contributions to bpf/ are only of minor nature such as
straightforward cleanups, small fixes, or spelling corrections, are:
 - Dmitry Savintsev <dsavints@gmail.com>
 - dechengyuan <dechengyuan@tencent.com>

Acked-by: Jiri Olsa <jolsa@kernel.org>
Acked-by: Djalal Harouni <tixxdz@gmail.com>
Acked-by: Anastasios Papagiannis <tasos.papagiannnis@gmail.com>
Acked-by: Kevin Sheldrake <kevin.sheldrake@isovalent.com>
Acked-by: Kornilios Kourtis <kornilios@isovalent.com>
Acked-by: Peihao Yang <peihao.young@gmail.com>
Acked-by: William Findlay <will@isovalent.com>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Acked-by: Mahe Tardy <mahe.tardy@gmail.com>
Acked-by: Sarah Fujimori <sarah.fujimori@isovalent.com>
Acked-by: William Findlay <william@williamfindlay.com>
Signed-off-by: Kornilios Kourtis <kornilios@isovalent.com>

bpf/cgroup/bpf_cgroup_events.h

@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: GPL-2.0
+// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
 /* Copyright Authors of Tetragon */
 
 #ifndef _BPF_CGROUP_EVENTS__

bpf/cgroup/bpf_cgroup_mkdir.c

@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: GPL-2.0
+// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
 /* Copyright Authors of Tetragon */
 
 #include "vmlinux.h"

bpf/cgroup/bpf_cgroup_release.c

@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: GPL-2.0
+// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
 /* Copyright Authors of Tetragon */
 
 #include "vmlinux.h"

bpf/cgroup/bpf_cgroup_rmdir.c

@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: GPL-2.0
+// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
 /* Copyright Authors of Tetragon */
 
 #include "vmlinux.h"

bpf/lib/bpf_cgroup.h

@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: GPL-2.0
+// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
 /* Copyright Authors of Tetragon */
 
 #ifndef __BPF_CGROUP_

bpf/lib/bpf_cred.h

@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: GPL-2.0
+// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
 /* Copyright Authors of Tetragon */
 
 #ifndef __BPF_CRED_

bpf/lib/bpf_event.h

@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: GPL-2.0
+// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
 /* Copyright Authors of Cilium */
 
 #ifndef __BPF_EVENT_H

bpf/lib/bpf_helpers.h

@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: GPL-2.0
+// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
 /* Copyright Authors of Cilium */
 
 #ifndef __BPF_HELPERS_

bpf/lib/bpf_task.h

@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: GPL-2.0
+// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
 /* Copyright Authors of Cilium */
 
 #ifndef _BPF_TASK_H

bpf/lib/common.h

@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: GPL-2.0
+// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
 
 #ifndef _MSG_COMMON__
 #define _MSG_COMMON__

bpf/lib/data_msg.h

@@ -1,4 +1,4 @@
-/* SPDX-License-Identifier: GPL-2.0 */
+/* SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) */
 /* Copyright Authors of Cilium */
 
 #ifndef __DATA_MSG_

bpf/lib/environ_conf.h

@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: GPL-2.0
+// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
 /* Copyright Authors of Tetragon */
 
 #ifndef __ENVIRON_CONF_

bpf/lib/generic.h

@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: GPL-2.0
+// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
 /* Copyright Authors of Cilium */
 
 #ifndef _GENERIC__

bpf/lib/globals.h

@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: GPL-2.0
+// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
 /* Copyright Authors of Cilium */
 
 #ifndef _GLOBALS__

bpf/lib/msg_types.h

@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: GPL-2.0
+// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
 /* Copyright Authors of Cilium */
 
 #ifndef _MSG_TYPES_

bpf/lib/process.h

@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: GPL-2.0
+// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
 /* Copyright Authors of Cilium */
 
 #ifndef _PROCESS__

bpf/process/addr_lpm_maps.h

@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: GPL-2.0
+// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
 /* Copyright Authors of Cilium */
 
 #ifndef ADDR_LPM_MAPS_H__

bpf/process/argfilter_maps.h

@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: GPL-2.0
+// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
 /* Copyright Authors of Cilium */
 
 #ifndef ARGFILTER_MAPS_H__

bpf/process/bpf_execve_bprm_commit_creds.c

@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: GPL-2.0
+// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
 /* Copyright Authors of Tetragon */
 
 #include "vmlinux.h"
@@ -8,7 +8,7 @@
 #include "common.h"
 #include "process.h"
 
-char _license[] __attribute__((section("license"), used)) = "GPL";
+char _license[] __attribute__((section("license"), used)) = "Dual BSD/GPL";
 
 /*
  * Process execution is installing the new credentials and security attributes

bpf/process/bpf_execve_event.c

@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: GPL-2.0
+// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
 /* Copyright Authors of Cilium */
 
 #include "vmlinux.h"
@@ -9,7 +9,7 @@
 #include "bpf_process_event.h"
 #include "bpf_helpers.h"
 
-char _license[] __attribute__((section("license"), used)) = "GPL";
+char _license[] __attribute__((section("license"), used)) = "Dual BSD/GPL";
 
 struct {
 	__uint(type, BPF_MAP_TYPE_PROG_ARRAY);

bpf/process/bpf_exit.c

@@ -1,11 +1,11 @@
-// SPDX-License-Identifier: GPL-2.0
+// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
 /* Copyright Authors of Cilium */
 
 #include "vmlinux.h"
 #include "bpf_exit.h"
 #include "bpf_tracing.h"
 
-char _license[] __attribute__((section("license"), used)) = "GPL";
+char _license[] __attribute__((section("license"), used)) = "Dual BSD/GPL";
 
 /*
  * Hooking on acct_process kernel function, which is called on the task's

bpf/process/bpf_exit.h

@@ -1,4 +1,4 @@
-/* SPDX-License-Identifier: GPL-2.0 */
+/* SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) */
 /* Copyright Authors of Cilium */
 
 #ifndef __EXIT_H__

bpf/process/bpf_fork.c

@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: GPL-2.0
+// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
 /* Copyright Authors of Cilium */
 
 #include "vmlinux.h"
@@ -11,7 +11,7 @@
 #include "environ_conf.h"
 #include "bpf_process_event.h"
 
-char _license[] __attribute__((section("license"), used)) = "GPL";
+char _license[] __attribute__((section("license"), used)) = "Dual BSD/GPL";
 #ifdef VMLINUX_KERNEL_VERSION
 int _version __attribute__((section(("version")), used)) =
 	VMLINUX_KERNEL_VERSION;

bpf/process/bpf_generic_kprobe.c

@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: GPL-2.0
+// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
 /* Copyright Authors of Cilium */
 
 #include "vmlinux.h"
@@ -15,7 +15,7 @@
 #include "pfilter.h"
 #include "policy_filter.h"
 
-char _license[] __attribute__((section("license"), used)) = "GPL";
+char _license[] __attribute__((section("license"), used)) = "Dual BSD/GPL";
 
 struct {
 	__uint(type, BPF_MAP_TYPE_PERCPU_ARRAY);

bpf/process/bpf_generic_retkprobe.c

@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: GPL-2.0
+// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
 /* Copyright Authors of Cilium */
 
 #include "vmlinux.h"
@@ -12,7 +12,7 @@
 
 #define MAX_FILENAME 8096
 
-char _license[] __attribute__((section("license"), used)) = "GPL";
+char _license[] __attribute__((section("license"), used)) = "Dual BSD/GPL";
 
 struct {
 	__uint(type, BPF_MAP_TYPE_PERCPU_ARRAY);

bpf/process/bpf_generic_tracepoint.c

@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: GPL-2.0
+// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
 /* Copyright Authors of Cilium */
 
 #include "vmlinux.h"
@@ -324,4 +324,4 @@ generic_tracepoint_output(void *ctx)
 	return generic_output(ctx, (struct bpf_map_def *)&tp_heap);
 }
 
-char _license[] __attribute__((section("license"), used)) = "GPL";
+char _license[] __attribute__((section("license"), used)) = "Dual BSD/GPL";

bpf/process/bpf_generic_uprobe.c

@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: GPL-2.0
+// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
 /* Copyright Authors of Cilium */
 
 #include "vmlinux.h"
@@ -14,7 +14,7 @@
 #include "generic_calls.h"
 #include "pfilter.h"
 
-char _license[] __attribute__((section("license"), used)) = "GPL";
+char _license[] __attribute__((section("license"), used)) = "Dual BSD/GPL";
 
 struct {
 	__uint(type, BPF_MAP_TYPE_PERCPU_ARRAY);

bpf/process/bpf_killer.c

@@ -1,6 +1,6 @@
 #include "bpf_killer.h"
 
-char _license[] __attribute__((section("license"), used)) = "GPL";
+char _license[] __attribute__((section("license"), used)) = "Dual BSD/GPL";
 
 #ifdef __MULTI_KPROBE
 #define MAIN "kprobe.multi/killer"

bpf/process/bpf_killer.h

@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: GPL-2.0
+// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
 /* Copyright Authors of Cilium */
 
 #ifndef __KILLER_H__

bpf/process/bpf_loader.c

@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: GPL-2.0
+// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
 /* Copyright Authors of Cilium */
 
 #include "vmlinux.h"
@@ -19,7 +19,7 @@ struct msg_loader {
 	void *pe;
 };
 
-char _license[] __attribute__((section("license"), used)) = "GPL";
+char _license[] __attribute__((section("license"), used)) = "Dual BSD/GPL";
 
 struct {
 	__uint(type, BPF_MAP_TYPE_PERCPU_ARRAY);

bpf/process/bpf_process_event.h

@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: GPL-2.0
+// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
 /* Copyright Authors of Cilium */
 
 #ifndef _BPF_PROCESS_EVENT__

bpf/process/data_event.h

@@ -1,4 +1,4 @@
-/* SPDX-License-Identifier: GPL-2.0 */
+/* SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) */
 /* Copyright Authors of Cilium */
 
 #ifndef __DATA_EVENT_H__

bpf/process/generic_calls.h

@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: GPL-2.0
+// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
 /* Copyright Authors of Cilium */
 
 #ifndef __GENERIC_CALLS_H__

bpf/process/policy_filter.h

@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: GPL-2.0
+// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
 /* Copyright Authors of Cilium */
 
 #ifndef POLICY_FILTER_MAPS_H__

bpf/process/retprobe_map.h

@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: GPL-2.0
+// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
 /* Copyright Authors of Cilium */
 
 #ifndef __RETPROBE_MAP_H__

bpf/process/string_maps.h

@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: GPL-2.0
+// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
 /* Copyright Authors of Cilium */
 
 #ifndef STRING_MAPS_H__

bpf/process/types/basic.h

@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: GPL-2.0
+// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
 /* Copyright Authors of Cilium */
 
 #ifndef __BASIC_H__

bpf/process/types/bpfattr.h

@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: GPL-2.0
+// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
 /* Copyright Authors of Cilium */
 
 #ifndef __BPFATTR_H__

bpf/process/types/bpfmap.h

@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: GPL-2.0
+// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
 /* Copyright Authors of Cilium */
 
 #ifndef __BPFMAP_H__

bpf/process/types/capabilities.h

@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: GPL-2.0
+// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
 /* Copyright Authors of Cilium */
 
 #ifndef __CAPABILITIES_H__

bpf/process/types/module.h

@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: GPL-2.0
+// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
 /* Copyright Authors of Tetragon */
 
 #ifndef __LINUX_MODULE_H__

bpf/process/types/operations.h

@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: GPL-2.0
+// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
 /* Copyright Authors of Cilium */
 
 #ifndef __OPERATIONS_H__

bpf/process/types/perfevent.h

@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: GPL-2.0
+// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
 /* Copyright Authors of Cilium */
 
 #ifndef __PERFEVENT_H__

bpf/process/types/skb.h

@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: GPL-2.0
+// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
 /* Copyright Authors of Cilium */
 
 #ifndef __SKB_H__

bpf/process/types/sock.h

@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: GPL-2.0
+// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
 /* Copyright Authors of Cilium */
 
 #ifndef __SOCK_H__

bpf/process/types/tuple.h

@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: GPL-2.0
+// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
 /* Copyright Authors of Cilium */
 
 #ifndef __TUPLE_H__

bpf/test/bpf_globals.c

@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: GPL-2.0
+// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
 /* Copyright Authors of Cilium */
 
 #include "vmlinux.h"
@@ -8,7 +8,7 @@
 #include "bpf_task.h"
 #include "globals.h"
 
-char _license[] __attribute__((section("license"), used)) = "GPL";
+char _license[] __attribute__((section("license"), used)) = "Dual BSD/GPL";
 
 GLOBAL_U16 g_u16;
 GLOBAL_I16 g_i16;

bpf/test/bpf_lseek.c

@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: GPL-2.0
+// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
 /* Copyright Authors of Cilium */
 
 #include "vmlinux.h"
@@ -35,7 +35,7 @@ struct sys_enter_lseek_args {
 	__u64 whence;
 };
 
-char _license[] __attribute__((section("license"), used)) = "GPL";
+char _license[] __attribute__((section("license"), used)) = "Dual BSD/GPL";
 
 __attribute__((section("tracepoint/sys_enter_lseek"), used)) int
 test_lseek(struct sys_enter_lseek_args *ctx)