netdev - Re: [patch net-next RFC v2 2/2] ipv6 addrconf: introduce IFA_F_MANAGETEMPADDR to tell kernel to manage temporary addresses

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Date:	Wed, 27 Nov 2013 14:02:53 +0100
From:	Thomas Haller <thaller@...hat.com>
To:	Jiri Pirko <jiri@...nulli.us>
Cc:	netdev@...r.kernel.org, davem@...emloft.net, kuznet@....inr.ac.ru,
	jmorris@...ei.org, yoshfuji@...ux-ipv6.org, kaber@...sh.net,
	stephen@...workplumber.org, hannes@...essinduktion.org,
	vyasevich@...il.com, dcbw@...hat.com, David.Laight@...LAB.COM
Subject: Re: [patch net-next RFC v2 2/2] ipv6 addrconf: introduce
 IFA_F_MANAGETEMPADDR to tell kernel to manage temporary addresses

Hi Jiri,


just two comments:


>  		addrconf_verify(0);
>  		return 0;
> @@ -3609,6 +3617,7 @@ static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
>  	u32 flags;
>  	clock_t expires;
>  	unsigned long timeout;
> +	bool was_managetempaddr;
>  
>  	if (!valid_lft || (prefered_lft > valid_lft))
>  		return -EINVAL;
> @@ -3632,7 +3641,10 @@ static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
>  	}
>  
>  	spin_lock_bh(&ifp->lock);


We should make sure here, not to allow IFA_F_MANAGETEMPADDR, if ifp has
prefixlen!=64 or is IFA_F_TEMPORARY itself. Note, that inet6_rtm_newaddr
does check for ifm->ifa_prefixlen != 64, but when modifying an existing
address, the ifm->ifa_prefixlen is not relevant.


> -	ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
> +	was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
> +	ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
> +			IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR);
> +	ifp->flags |= ifa_flags;
>  	ifp->tstamp = jiffies;
>  	ifp->valid_lft = valid_lft;
>  	ifp->prefered_lft = prefered_lft;
> @@ -3643,6 +3655,14 @@ static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
>  
>  	addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
>  			      expires, flags);
> +
> +	if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
> +		if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
> +			valid_lft = prefered_lft = 0;
> +		manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
> +				 false, jiffies);

I think, the parameter "create" of manage_tempaddrs should be set to
"!was_managetempaddr", because we want to force creation of a new
temporary address, if ifp just gets the flag IFA_F_MANAGETEMPADDR
(without having it before).





Thomas

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