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2024-02-20 ea08eeccae9297f7aabd2ef7f0c2517ac4549acc

 kernel/net/ipv4/datagram.c
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@@ -1,14 +1,10 @@
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+// SPDX-License-Identifier: GPL-2.0-or-later
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 /*
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  *	common UDP/RAW code
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  *	Linux INET implementation
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  *
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  * Authors:
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  * 	Hideaki YOSHIFUJI <yoshfuji@linux-ipv6.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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 #include <linux/types.h>
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@@ -43,7 +39,7 @@
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 	oif = sk->sk_bound_dev_if;
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 	saddr = inet->inet_saddr;
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 	if (ipv4_is_multicast(usin->sin_addr.s_addr)) {
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-		if (!oif)
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+		if (!oif || netif_index_is_l3_master(sock_net(sk), oif))
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 			oif = inet->mc_index;
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 		if (!saddr)
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 			saddr = inet->mc_addr;
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@@ -74,7 +70,7 @@
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 	}
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 	inet->inet_daddr = fl4->daddr;
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 	inet->inet_dport = usin->sin_port;
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-	reuseport_has_conns(sk, true);
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+	reuseport_has_conns_set(sk);
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 	sk->sk_state = TCP_ESTABLISHED;
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 	sk_set_txhash(sk);
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 	inet->inet_id = prandom_u32();