Date: Tue, 31 Mar 2020 15:00:46 +0300 From: "Andrey V. Elsukov" <bu7cher@yandex.ru> To: Martin Beran <martin@mber.cz>, freebsd-hackers@freebsd.org Subject: Re: Permanent NDP entries overriden by ICMPv6 Neighbor Advertisement Message-ID: <6709cb35-9a83-b72f-9090-9df9c498ae14@yandex.ru> In-Reply-To: <66229645-df41-e964-9dd5-0dc4b1845a9b@mber.cz> References: <66229645-df41-e964-9dd5-0dc4b1845a9b@mber.cz>
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[-- Attachment #1 --]
On 31.03.2020 09:41, Martin Beran wrote:
> Hi,
>
> when I set a permanent NDP entry by command
>
> ndp -s <ip> <mac>
>
> the record is denoted "permanent", by the specified MAC address is
> overriden by a received neighbor advisory for the same IP address, but
> with different MAC address. I tried this on FreeBSD 12.1-p2. Is this the
> intended behavior, or should a "permanent" entry be really permanent?
Hi,
I think the entry should be permanent. Can you try this patch?
--
WBR, Andrey V. Elsukov
[-- Attachment #2 --]
Index: sys/netinet6/nd6_nbr.c
===================================================================
--- sys/netinet6/nd6_nbr.c (revision 359434)
+++ sys/netinet6/nd6_nbr.c (working copy)
@@ -754,6 +754,12 @@ nd6_na_input(struct mbuf *m, int off, int icmp6len
goto freeit;
}
+ /*
+ * Do not try to override static entry.
+ */
+ if (ln->la_flags & LLE_STATIC)
+ goto freeit;
+
if (ln->ln_state == ND6_LLINFO_INCOMPLETE) {
/*
* If the link-layer has address, and no lladdr option came,
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