netdev - Re: nonlocal

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Message-ID: <30fe1fa984e52f4cca318e54f9d97a21@chewa.net>
Date:	Fri, 25 Jun 2010 20:59:58 +0200
From:	Rémi Denis-Courmont <remi@...lab.net>
To:	Michal Humpula <michal.humpula@...rydum.cz>
Cc:	netdev@...r.kernel.org
Subject: Re: nonlocal_bind & IPv6


On Fri, 25 Jun 2010 20:43:45 +0200, Michal Humpula
<michal.humpula@...rydum.cz> wrote:
> I was just wondering, what's wrong with this?

It's not in unified format :D

> *** linux-2.6.34/net/ipv6/af_inet6.c    2010-05-16 23:17:36.000000000
> +0200
> --- linux-2.6.34-hack/net/ipv6/af_inet6.c       2010-06-25
> 19:50:19.000000000 +0200
> ***************
> *** 345,354 ****
> --- 345,356 ----
>                         if (!(addr_type & IPV6_ADDR_MULTICAST)) {
>                                 if (!ipv6_chk_addr(net, &addr->sin6_addr,
>                                                    dev, 0)) {
> +           if (!sysctl_ip_nonlocal_bind) {
>                                         err = -EADDRNOTAVAIL;
>                                         goto out_unlock;
>             }
>                                 }
> +                       }
>                         rcu_read_unlock();
>                 }
>         }
> 
> Motivation: just want to balance one IPv6 address between two nodes with
> the help of keepalived the same way I do it with IPv4 without the need
> of restarting the daemons binding on that IP.

nonlocal_bind seems a bit 80's to me. Why don't you bind the daemon to
[::]? If it needs to know its own address, it can always use getsockname()
for connected sockets and IPV6_PKTINFO ancillary data for datagram sockets.

-- 
Rémi Denis-Courmont
http://www.remlab.net
http://fi.linkedin.com/in/remidenis

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