netdev - Re: [PATCH] IPv6: Implement RFC 4429 Optimistic Duplicate Address Detection

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Date:	Thu, 25 Jan 2007 15:18:59 -0500
From:	Vlad Yasevich <vladislav.yasevich@...com>
To:	Neil Horman <nhorman@...driver.com>
Cc:	Sridhar Samudrala <sri@...ibm.com>,
	YOSHIFUJI Hideaki / 吉藤英明 <yoshfuji@...ux-ipv6.org>,
	davem@...emloft.net, kuznet@....inr.ac.ru, pekkas@...core.fi,
	jmorris@...ei.org, kaber@...eworks.de, netdev@...r.kernel.org
Subject: Re: [PATCH] IPv6: Implement RFC 4429 Optimistic Duplicate Address
 Detection

Hi Neil

> @@ -1027,15 +1029,17 @@ int ipv6_dev_get_saddr(struct net_device *daddr_dev,
>  				}
>  			}
>  
> -			/* Rule 3: Avoid deprecated address */
> +			/* Rule 3: Avoid deprecated and optimistic address */
>  			if (hiscore.rule < 3) {
>  				if (ipv6_saddr_preferred(hiscore.addr_type) ||
> -				    !(ifa_result->flags & IFA_F_DEPRECATED))
> +				    ((!(ifa_result->flags & IFA_F_DEPRECATED)) && 
> +				    (!(ifa_result->flags & IFA_F_OPTIMISTIC))))

One style comment.  Looks like some extra parenthesis that I don't thing are needed.
I think you can say

+				    (!(ifa_result->flags & IFA_F_DEPRECATED)) && 
+				     !(ifa_result->flags & IFA_F_OPTIMISTIC))))


>  					hiscore.attrs |= IPV6_SADDR_SCORE_PREFERRED;
>  				hiscore.rule++;
>  			}
>  			if (ipv6_saddr_preferred(score.addr_type) ||
> -			    !(ifa->flags & IFA_F_DEPRECATED)) {
> +			    ((!(ifa->flags & IFA_F_DEPRECATED)) &&
> +			    (!(ifa_result->flags & IFA_F_OPTIMISTIC)))) {

same here.

>  				score.attrs |= IPV6_SADDR_SCORE_PREFERRED;
>  				if (!(hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)) {
>  					score.rule = 3;

-vlad

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