[PATCH] treewide: Add SPDX identifier to IETF ASN.1 modules

[Lukas Wunner <lukas@wunner.de>]

Per section 4.c. of the IETF Trust Legal Provisions, "Code Components"
in IETF Documents are licensed on the terms of the BSD-3-Clause license:

https://trustee.ietf.org/documents/trust-legal-provisions/tlp-5/

The term "Code Components" specifically includes ASN.1 modules:

https://trustee.ietf.org/documents/trust-legal-provisions/code-components-list-3/

Add an SPDX identifier as well as a copyright notice pursuant to section
6.d. of the Trust Legal Provisions to all ASN.1 modules in the tree
which are derived from IETF Documents.

Section 4.d. of the Trust Legal Provisions requests that each Code
Component identify the RFC from which it is taken, so link that RFC
in every ASN.1 module.

Signed-off-by: Lukas Wunner <lukas@wunner.de>
---
 I'm adding a new IETF ASN.1 module for PCI device authentication, hence
 had to research what the correct license is.  Thought I'd fix this up
 treewide while at it.

 Not included here is fs/smb/client/cifs_spnego_negtokeninit.asn1,
 which is similar to fs/smb/client/ksmbd_spnego_negtokeninit.asn1,
 but contains a Microsoft extension published as Open Specifications
 Documentation.  It's unclear to me what license they use:
 https://learn.microsoft.com/en-us/openspecs/windows_protocols/ms-spng/

 crypto/asymmetric_keys/pkcs7.asn1            | 7 +++++++
 crypto/asymmetric_keys/pkcs8.asn1            | 6 ++++++
 crypto/asymmetric_keys/x509.asn1             | 7 +++++++
 crypto/asymmetric_keys/x509_akid.asn1        | 5 +++++
 crypto/rsaprivkey.asn1                       | 7 +++++++
 crypto/rsapubkey.asn1                        | 7 +++++++
 fs/smb/server/ksmbd_spnego_negtokeninit.asn1 | 8 ++++++++
 fs/smb/server/ksmbd_spnego_negtokentarg.asn1 | 7 +++++++
 net/ipv4/netfilter/nf_nat_snmp_basic.asn1    | 8 ++++++++
 9 files changed, 62 insertions(+)

diff --git a/crypto/asymmetric_keys/pkcs7.asn1 b/crypto/asymmetric_keys/pkcs7.asn1
index 1eca740..28e1f4a 100644
--- a/crypto/asymmetric_keys/pkcs7.asn1
+++ b/crypto/asymmetric_keys/pkcs7.asn1
@@ -1,3 +1,10 @@
+-- SPDX-License-Identifier: BSD-3-Clause
+--
+-- Copyright (C) 2009 IETF Trust and the persons identified as authors
+-- of the code
+--
+-- https://www.rfc-editor.org/rfc/rfc5652#section-3
+
 PKCS7ContentInfo ::= SEQUENCE {
 	contentType	ContentType ({ pkcs7_check_content_type }),
 	content		[0] EXPLICIT SignedData OPTIONAL
diff --git a/crypto/asymmetric_keys/pkcs8.asn1 b/crypto/asymmetric_keys/pkcs8.asn1
index 702c41a..a2a8af2 100644
--- a/crypto/asymmetric_keys/pkcs8.asn1
+++ b/crypto/asymmetric_keys/pkcs8.asn1
@@ -1,3 +1,9 @@
+-- SPDX-License-Identifier: BSD-3-Clause
+--
+-- Copyright (C) 2010 IETF Trust and the persons identified as authors
+-- of the code
+--
+-- https://www.rfc-editor.org/rfc/rfc5958#section-2
 --
 -- This is the unencrypted variant
 --
diff --git a/crypto/asymmetric_keys/x509.asn1 b/crypto/asymmetric_keys/x509.asn1
index 92d59c3..feb9573 100644
--- a/crypto/asymmetric_keys/x509.asn1
+++ b/crypto/asymmetric_keys/x509.asn1
@@ -1,3 +1,10 @@
+-- SPDX-License-Identifier: BSD-3-Clause
+--
+-- Copyright (C) 2008 IETF Trust and the persons identified as authors
+-- of the code
+--
+-- https://www.rfc-editor.org/rfc/rfc5280#section-4
+
 Certificate ::= SEQUENCE {
 	tbsCertificate		TBSCertificate ({ x509_note_tbs_certificate }),
 	signatureAlgorithm	AlgorithmIdentifier,
diff --git a/crypto/asymmetric_keys/x509_akid.asn1 b/crypto/asymmetric_keys/x509_akid.asn1
index 1a33231..164b2ed 100644
--- a/crypto/asymmetric_keys/x509_akid.asn1
+++ b/crypto/asymmetric_keys/x509_akid.asn1
@@ -1,3 +1,8 @@
+-- SPDX-License-Identifier: BSD-3-Clause
+--
+-- Copyright (C) 2008 IETF Trust and the persons identified as authors
+-- of the code
+--
 -- X.509 AuthorityKeyIdentifier
 -- rfc5280 section 4.2.1.1
 
diff --git a/crypto/rsaprivkey.asn1 b/crypto/rsaprivkey.asn1
index 4ce0675..76865124 100644
--- a/crypto/rsaprivkey.asn1
+++ b/crypto/rsaprivkey.asn1
@@ -1,3 +1,10 @@
+-- SPDX-License-Identifier: BSD-3-Clause
+--
+-- Copyright (C) 2016 IETF Trust and the persons identified as authors
+-- of the code
+--
+-- https://www.rfc-editor.org/rfc/rfc8017#appendix-A.1.2
+
 RsaPrivKey ::= SEQUENCE {
 	version		INTEGER,
 	n		INTEGER ({ rsa_get_n }),
diff --git a/crypto/rsapubkey.asn1 b/crypto/rsapubkey.asn1
index 725498e..0d32b1c 100644
--- a/crypto/rsapubkey.asn1
+++ b/crypto/rsapubkey.asn1
@@ -1,3 +1,10 @@
+-- SPDX-License-Identifier: BSD-3-Clause
+--
+-- Copyright (C) 2016 IETF Trust and the persons identified as authors
+-- of the code
+--
+-- https://www.rfc-editor.org/rfc/rfc8017#appendix-A.1.1
+
 RsaPubKey ::= SEQUENCE {
 	n INTEGER ({ rsa_get_n }),
 	e INTEGER ({ rsa_get_e })
diff --git a/fs/smb/server/ksmbd_spnego_negtokeninit.asn1 b/fs/smb/server/ksmbd_spnego_negtokeninit.asn1
index 0065f19..00151380 100644
--- a/fs/smb/server/ksmbd_spnego_negtokeninit.asn1
+++ b/fs/smb/server/ksmbd_spnego_negtokeninit.asn1
@@ -1,3 +1,11 @@
+-- SPDX-License-Identifier: BSD-3-Clause
+--
+-- Copyright (C) 1998, 2000 IETF Trust and the persons identified as authors
+-- of the code
+--
+-- https://www.rfc-editor.org/rfc/rfc2478#section-3.2.1
+-- https://www.rfc-editor.org/rfc/rfc2743#section-3.1
+
 GSSAPI ::=
 	[APPLICATION 0] IMPLICIT SEQUENCE {
 		thisMech
diff --git a/fs/smb/server/ksmbd_spnego_negtokentarg.asn1 b/fs/smb/server/ksmbd_spnego_negtokentarg.asn1
index 1151933..797e485 100644
--- a/fs/smb/server/ksmbd_spnego_negtokentarg.asn1
+++ b/fs/smb/server/ksmbd_spnego_negtokentarg.asn1
@@ -1,3 +1,10 @@
+-- SPDX-License-Identifier: BSD-3-Clause
+--
+-- Copyright (C) 1998 IETF Trust and the persons identified as authors
+-- of the code
+--
+-- https://www.rfc-editor.org/rfc/rfc2478#section-3.2.1
+
 GSSAPI ::=
 	CHOICE {
 		negTokenInit
diff --git a/net/ipv4/netfilter/nf_nat_snmp_basic.asn1 b/net/ipv4/netfilter/nf_nat_snmp_basic.asn1
index 24b7326..dc2cc57 100644
--- a/net/ipv4/netfilter/nf_nat_snmp_basic.asn1
+++ b/net/ipv4/netfilter/nf_nat_snmp_basic.asn1
@@ -1,3 +1,11 @@
+-- SPDX-License-Identifier: BSD-3-Clause
+--
+-- Copyright (C) 1990, 2002 IETF Trust and the persons identified as authors
+-- of the code
+--
+-- https://www.rfc-editor.org/rfc/rfc1157#section-4
+-- https://www.rfc-editor.org/rfc/rfc3416#section-3
+
 Message ::=
 	SEQUENCE {
 		version
-- 
2.40.1