netdev - Re: [PATCH net] net: ipv6: allow explicitly choosing optimistic addresses

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Date:	Fri, 12 Dec 2014 16:37:46 +0900
From:	Lorenzo Colitti <lorenzo@...gle.com>
To:	Erik Kline <ek@...gle.com>
Cc:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	YOSHIFUJI Hideaki <yoshfuji@...ux-ipv6.org>,
	Hannes Frederic Sowa <hannes@...essinduktion.org>
Subject: Re: [PATCH net] net: ipv6: allow explicitly choosing optimistic addresses

On Fri, Dec 12, 2014 at 12:50 PM, Erik Kline <ek@...gle.com> wrote:
>
> @@ -1527,7 +1527,8 @@ int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
>                 if (!net_eq(dev_net(ifp->idev->dev), net))
>                         continue;
>                 if (ipv6_addr_equal(&ifp->addr, addr) &&
> -                   !(ifp->flags&IFA_F_TENTATIVE) &&
> +                   (!(ifp->flags&IFA_F_TENTATIVE) ||
> +                    ifp->flags&IFA_F_OPTIMISTIC) &&
>                     (dev == NULL || ifp->idev->dev == dev ||
>                      !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
>                         rcu_read_unlock_bh();

I looked at the callers of ipv6_chk_addr (lxr finds 19 files); from
what I saw, this change will make all of them more correct except for
ndisc_solicit. With this change, ndisc_solicit could now send
neighbour solicitations from optimistic addresses, which is not
allowed by the RFC.
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