netdev - Re: [PATCH net-next v3] ipv6 addrconf: Implemented enhanced DAD (RFC7527)

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Date:   Fri, 02 Dec 2016 12:27:28 -0500 (EST)
From:   David Miller <davem@...emloft.net>
To:     nordmark@...sta.com
Cc:     netdev@...r.kernel.org, hannes@...essinduktion.org,
        gilligan@...sta.com
Subject: Re: [PATCH net-next v3] ipv6 addrconf: Implemented enhanced DAD
 (RFC7527)

From: Erik Nordmark <nordmark@...sta.com>
Date: Wed, 30 Nov 2016 15:39:19 -0800

> @@ -794,6 +808,17 @@ static void ndisc_recv_ns(struct sk_buff *skb)
>  have_ifp:
>  		if (ifp->flags & (IFA_F_TENTATIVE|IFA_F_OPTIMISTIC)) {
>  			if (dad) {
> +				if (nonce != 0 && ifp->dad_nonce == nonce) {
> +					u8 *np = (u8 *)&nonce;
> +					/* Matching nonce if looped back */
> +					ND_PRINTK(2, notice,
> +						  "%s: IPv6 DAD loopback for address %pI6c nonce %02x:%02x:%02x:%02x:%02x:%02x ignored\n",
> +						  ifp->idev->dev->name,
> +						  &ifp->addr,
> +						  np[0], np[1], np[2], np[3],
> +						  np[4], np[5]);

I know you said you'd leave this, but I'd actually like to ask that you
use %pM here to save some kernel size.

Thank you.