net: Add SPDX ids to some source files

Add SPDX-License-Identifier lines to several source
files under the network sub-directory.  Work on files
in the core, dns_resolver, ipv4, ipv6 and
netfilter sub-dirs.  Remove boilerplate
and license reference text to avoid ambiguity.

Rusty Russell has expressed that his contributions
were intended to be GPL-2.0-or-later.

Signed-off-by: Tim Bird <tim.bird@sony.com>
Link: https://patch.msgid.link/20260305004724.87469-1-tim.bird@sony.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

net/core/fib_notifier.c

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 #include <linux/rtnetlink.h>
 #include <linux/notifier.h>
 #include <linux/rcupdate.h>

net/core/sock_diag.c

@@ -1,5 +1,4 @@
-/* License: GPL */
+// SPDX-License-Identifier: GPL-2.0
-
 #include <linux/filter.h>
 #include <linux/mutex.h>
 #include <linux/socket.h>

net/dns_resolver/dns_key.c

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
 /* Key type used to cache DNS lookups made by the kernel
  *
  * See Documentation/networking/dns_resolver.rst
@@ -7,19 +8,6 @@
  *              Steve French (sfrench@us.ibm.com)
  *              Wang Lei (wang840925@gmail.com)
  *		David Howells (dhowells@redhat.com)
- *
- *   This library is free software; you can redistribute it and/or modify
- *   it under the terms of the GNU Lesser General Public License as published
- *   by the Free Software Foundation; either version 2.1 of the License, or
- *   (at your option) any later version.
- *
- *   This library is distributed in the hope that it will be useful,
- *   but WITHOUT ANY WARRANTY; without even the implied warranty of
- *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
- *   the GNU Lesser General Public License for more details.
- *
- *   You should have received a copy of the GNU Lesser General Public License
- *   along with this library; if not, see <http://www.gnu.org/licenses/>.
  */
 #include <linux/module.h>
 #include <linux/moduleparam.h>

net/dns_resolver/dns_query.c

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
 /* Upcall routine, designed to work as a key type and working through
  * /sbin/request-key to contact userspace when handling DNS queries.
  *
@@ -20,19 +21,6 @@
  *   For example to use this module to query AFSDB RR:
  *
  *	create dns_resolver afsdb:* * /sbin/dns.afsdb %k
- *
- *   This library is free software; you can redistribute it and/or modify
- *   it under the terms of the GNU Lesser General Public License as published
- *   by the Free Software Foundation; either version 2.1 of the License, or
- *   (at your option) any later version.
- *
- *   This library is distributed in the hope that it will be useful,
- *   but WITHOUT ANY WARRANTY; without even the implied warranty of
- *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
- *   the GNU Lesser General Public License for more details.
- *
- *   You should have received a copy of the GNU Lesser General Public License
- *   along with this library; if not, see <http://www.gnu.org/licenses/>.
  */
 
 #include <linux/module.h>

net/dns_resolver/internal.h

@@ -1,21 +1,9 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
 /*
  *   Copyright (c) 2010 Wang Lei
  *   Author(s): Wang Lei (wang840925@gmail.com). All Rights Reserved.
  *
  *   Internal DNS Rsolver stuff
- *
- *   This library is free software; you can redistribute it and/or modify
- *   it under the terms of the GNU Lesser General Public License as published
- *   by the Free Software Foundation; either version 2.1 of the License, or
- *   (at your option) any later version.
- *
- *   This library is distributed in the hope that it will be useful,
- *   but WITHOUT ANY WARRANTY; without even the implied warranty of
- *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
- *   the GNU Lesser General Public License for more details.
- *
- *   You should have received a copy of the GNU Lesser General Public License
- *   along with this library; if not, see <http://www.gnu.org/licenses/>.
  */
 
 #include <linux/compiler.h>

net/ipv4/inetpeer.c

@@ -1,8 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
  *		INETPEER - A storage for permanent information about peers
  *
- *  This source is covered by the GNU GPL, the same as all kernel sources.
- *
  *  Authors:	Andrey V. Savochkin <saw@msu.ru>
  */
 

net/ipv4/ipmr_base.c

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /* Linux multicast routing support
  * Common logic shared by IPv4 [ipmr] and IPv6 [ip6mr] implementation
  */

net/ipv4/netfilter.c

@@ -1,7 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * IPv4 specific functions of netfilter core
  *
- * Rusty Russell (C) 2000 -- This code is GPL.
+ * Rusty Russell (C) 2000
  * Patrick McHardy (C) 2006-2012
  */
 #include <linux/kernel.h>

net/ipv4/tcp_bbr.c

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /* Bottleneck Bandwidth and RTT (BBR) congestion control
  *
  * BBR congestion control computes the sending rate based on the delivery

net/ipv4/tcp_dctcp.h

@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0 */
 #ifndef _TCP_DCTCP_H
 #define _TCP_DCTCP_H
 

net/ipv4/tcp_plb.c

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /* Protective Load Balancing (PLB)
  *
  * PLB was designed to reduce link load imbalance across datacenter

net/ipv6/fib6_notifier.c

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 #include <linux/notifier.h>
 #include <linux/socket.h>
 #include <linux/kernel.h>

net/ipv6/ila/ila_common.c

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 #include <linux/errno.h>
 #include <linux/ip.h>
 #include <linux/kernel.h>

net/ipv6/netfilter.c

@@ -1,7 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * IPv6 specific functions of netfilter core
  *
- * Rusty Russell (C) 2000 -- This code is GPL.
+ * Rusty Russell (C) 2000
  * Patrick McHardy (C) 2006-2012
  */
 #include <linux/kernel.h>

net/netfilter/core.c

@@ -1,10 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0
 /* netfilter.c: look after the filters for various protocols.
  * Heavily influenced by the old firewall.c by David Bonn and Alan Cox.
  *
  * Thanks to Rob `CmdrTaco' Malda for not influencing this code in any
  * way.
- *
- * This code is GPL.
  */
 #include <linux/kernel.h>
 #include <linux/netfilter.h>

net/netfilter/nf_conntrack_netlink.c

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /* Connection tracking via netlink socket. Allows for user space
  * protocol helpers and general trouble making from userspace.
  *
@@ -10,9 +11,6 @@
  * generally made possible by Network Robots, Inc. (www.networkrobots.com)
  *
  * Further development of this code funded by Astaro AG (http://www.astaro.com)
- *
- * This software may be used and distributed according to the terms
- * of the GNU General Public License, incorporated herein by reference.
  */
 
 #include <linux/init.h>

net/netfilter/nf_flow_table_offload.c

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 #include <linux/kernel.h>
 #include <linux/init.h>
 #include <linux/module.h>

net/netfilter/nf_queue.c

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Rusty Russell (C)2000 -- This code is GPL.
  * Patrick McHardy (c) 2006-2012

net/netfilter/nfnetlink.c

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /* Netfilter messages via netlink socket. Allows for user space
  * protocol helpers and general trouble making from userspace.
  *
@@ -9,9 +10,6 @@
  * generally made possible by Network Robots, Inc. (www.networkrobots.com)
  *
  * Further development of this code funded by Astaro AG (http://www.astaro.com)
- *
- * This software may be used and distributed according to the terms
- * of the GNU General Public License, incorporated herein by reference.
  */
 
 #include <linux/module.h>

net/netfilter/nft_chain_filter.c

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 #include <linux/init.h>
 #include <linux/kernel.h>
 #include <linux/netdevice.h>

net/netfilter/xt_connbytes.c

@@ -1,5 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0
 /* Kernel module to match connection tracking byte counter.
- * GPL (C) 2002 Martin Devera (devik@cdi.cz).
+ *  (C) 2002 Martin Devera (devik@cdi.cz).
  */
 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 #include <linux/module.h>

net/netfilter/xt_connlimit.c

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * netfilter module to limit the number of parallel tcp
  * connections per IP address.
@@ -9,7 +10,7 @@
  * based on ...
  *
  * Kernel module to match connection tracking information.
- * GPL (C) 1999  Rusty Russell (rusty@rustcorp.com.au).
+ *   (C) 1999  Rusty Russell (rusty@rustcorp.com.au).
  */
 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 

net/netfilter/xt_time.c

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
  *	xt_time
  *	Copyright © CC Computer Consultants GmbH, 2007
@@ -6,8 +7,6 @@
  *	This is a module which is used for time matching
  *	It is using some modified code from dietlibc (localtime() function)
  *	that you can find at https://www.fefe.de/dietlibc/
- *	This file is distributed under the terms of the GNU General Public
- *	License (GPL). Copies of the GPL can be obtained from gnu.org/gpl.
  */
 
 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt