add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/net/ipv6/ndisc.c
..
..
@@ -196,7 +196,8 @@
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 static inline int ndisc_is_useropt(const struct net_device *dev,
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 				   struct nd_opt_hdr *opt)
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 {
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-	return opt->nd_opt_type == ND_OPT_RDNSS ||
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+	return opt->nd_opt_type == ND_OPT_PREFIX_INFO ||
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+		opt->nd_opt_type == ND_OPT_RDNSS ||
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 		opt->nd_opt_type == ND_OPT_DNSSL ||
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 		opt->nd_opt_type == ND_OPT_CAPTIVE_PORTAL ||
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 		opt->nd_opt_type == ND_OPT_PREF64 ||