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Message-ID: <4A841D23.8020703@hp.com>
Date: Thu, 13 Aug 2009 10:03:15 -0400
From: Brian Haley <brian.haley@...com>
To: Jens Rosenboom <jens@...one.net>
CC: Linux Network Developers <netdev@...r.kernel.org>,
David Miller <davem@...emloft.net>
Subject: Re: [PATCH] ipv6: Log the explicit address that triggered DAD failure
Jens Rosenboom wrote:
> On Wed, 2009-08-12 at 21:33 -0400, Brian Haley wrote:
> [...]
>> The other thing I've come across that is similar to this is the
>> issue that when DAD fails, /sbin/ip doesn't show that it did,
>> the address just stays in a tentative state forever:
>>
>> inet6 dead:beef::1/64 scope global tentative
>> valid_lft forever preferred_lft forever
>>
>> Does anyone have an issue of adding a "dadfailed" flag to make
>> this more obvious:
>>
>> inet6 dead:beef::1/64 scope global tentative dadfailed
>> valid_lft forever preferred_lft forever
>
> It looks like you would have to spend the last available bit in
> ifa_flags for that, not sure if that is worth it, how about setting it
> to tentative|deprecated instead?
Yes, I saw that it would be the last flag so I didn't know how that would
go over. My other thought was to define a new flags structure that can
be passed in/out like IFA_CACHEINFO is. It's a much larger patch...
> Some action should maybe also happen in the case that the address wasn't
> tentative anymore in ndisc_recv_na(). At least it should also log the
> address itself:
>
> diff --git a/net/ipv6/ndisc.c b/net/ipv6/ndisc.c
> index 9eb68e9..1ba42bd 100644
> --- a/net/ipv6/ndisc.c
> +++ b/net/ipv6/ndisc.c
> @@ -955,8 +955,8 @@ static void ndisc_recv_na(struct sk_buff *skb)
> */
> if (skb->pkt_type != PACKET_LOOPBACK)
> ND_PRINTK1(KERN_WARNING
> - "ICMPv6 NA: someone advertises our address on %s!\n",
> - ifp->idev->dev->name);
> + "ICMPv6 NA: someone advertises our address %pI6 on %s!\n",
> + &ifp->addr, ifp->idev->dev->name);
> in6_ifa_put(ifp);
> return;
> }
That looks good to me too, thanks.
-Brian
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