add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/net/ipv6/xfrm6_input.c
..
..
@@ -86,6 +86,9 @@
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 	__be32 *udpdata32;
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 	__u16 encap_type = up->encap_type;
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+	if (skb->protocol == htons(ETH_P_IP))
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+		return xfrm4_udp_encap_rcv(sk, skb);
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+
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 	/* if this is not encapsulated socket, then just return now */
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 	if (!encap_type)
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 		return 1;