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2023-12-08 01573e231f18eb2d99162747186f59511f56b64d

 kernel/include/linux/udp.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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@@ -8,11 +9,6 @@
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  * Version:	@(#)udp.h	1.0.2	04/28/93
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  *
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  * Author:	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_UDP_H
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 #define _LINUX_UDP_H
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@@ -49,7 +45,15 @@
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 	unsigned int	 corkflag;	/* Cork is required */
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 	__u8		 encap_type;	/* Is this an Encapsulation socket? */
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 	unsigned char	 no_check6_tx:1,/* Send zero UDP6 checksums on TX? */
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-			 no_check6_rx:1;/* Allow zero UDP6 checksums on RX? */
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+			 no_check6_rx:1,/* Allow zero UDP6 checksums on RX? */
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+			 encap_enabled:1, /* This socket enabled encap
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+					   * processing; UDP tunnels and
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+					   * different encapsulation layer set
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+					   * this
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+					   */
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+			 gro_enabled:1,	/* Request GRO aggregation */
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+			 accept_udp_l4:1,
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+			 accept_udp_fraglist:1;
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 	/*
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 	 * Following member retains the information to create a UDP header
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 	 * when the socket is uncorked.
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@@ -71,6 +75,7 @@
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 	 * For encapsulation sockets.
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 	 */
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 	int (*encap_rcv)(struct sock *sk, struct sk_buff *skb);
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+	int (*encap_err_lookup)(struct sock *sk, struct sk_buff *skb);
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 	void (*encap_destroy)(struct sock *sk);
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 	/* GRO functions for UDP socket */
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@@ -115,6 +120,31 @@
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 	return udp_sk(sk)->no_check6_rx;
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 }
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+static inline void udp_cmsg_recv(struct msghdr *msg, struct sock *sk,
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+				 struct sk_buff *skb)
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+{
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+	int gso_size;
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+
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+	if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP_L4) {
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+		gso_size = skb_shinfo(skb)->gso_size;
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+		put_cmsg(msg, SOL_UDP, UDP_GRO, sizeof(gso_size), &gso_size);
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+	}
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+}
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+
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+static inline bool udp_unexpected_gso(struct sock *sk, struct sk_buff *skb)
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+{
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+	if (!skb_is_gso(skb))
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+		return false;
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+
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+	if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP_L4 && !udp_sk(sk)->accept_udp_l4)
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+		return true;
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+
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+	if (skb_shinfo(skb)->gso_type & SKB_GSO_FRAGLIST && !udp_sk(sk)->accept_udp_fraglist)
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+		return true;
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+
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+	return false;
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+}
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+
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 #define udp_portaddr_for_each_entry(__sk, list) \
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 	hlist_for_each_entry(__sk, list, __sk_common.skc_portaddr_node)
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