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2024-02-20 ea08eeccae9297f7aabd2ef7f0c2517ac4549acc

 kernel/include/linux/in.h
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@@ -1,3 +1,4 @@
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+/* SPDX-License-Identifier: GPL-2.0-or-later */
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 /*
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  * INET		An implementation of the TCP/IP protocol suite for the LINUX
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  *		operating system.  INET is implemented using the  BSD Socket
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@@ -9,11 +10,6 @@
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  *
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  * Authors:	Original taken from the GNU Project <netinet/in.h> file.
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  *		Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
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- *
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- *		This program is free software; you can redistribute it and/or
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- *		modify it under the terms of the GNU General Public License
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- *		as published by the Free Software Foundation; either version
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- *		2 of the License, or (at your option) any later version.
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  */
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 #ifndef _LINUX_IN_H
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 #define _LINUX_IN_H
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@@ -60,9 +56,14 @@
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 	return addr == htonl(INADDR_BROADCAST);
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 }
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+static inline bool ipv4_is_all_snoopers(__be32 addr)
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+{
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+	return addr == htonl(INADDR_ALLSNOOPERS_GROUP);
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+}
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+
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 static inline bool ipv4_is_zeronet(__be32 addr)
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 {
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-	return (addr & htonl(0xff000000)) == htonl(0x00000000);
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+	return (addr == 0);
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 }
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 /* Special-Use IPv4 Addresses (RFC3330) */