netdev - Re: [Bug 42012] New: regression on 2.6.39.3 with socket/bind; still there in 3.0.4

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Date:	Tue, 30 Aug 2011 21:44:19 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	shemminger@...ux-foundation.org, netdev@...r.kernel.org
Subject: Re: [Bug 42012] New: regression on 2.6.39.3 with socket/bind;
 still there in 3.0.4

Le mardi 30 août 2011 à 21:16 +0200, Eric Dumazet a écrit :
> Le mardi 30 août 2011 à 14:07 -0400, David Miller a écrit :
> > From: Eric Dumazet <eric.dumazet@...il.com>
> > Date: Tue, 30 Aug 2011 18:11:48 +0200
> > 
> > > Yep, we should relax the check and accept AF_UNSPEC.
> > 
> > I guess we'll have to do this, but I just can't bring myself to accept
> > that we can just do zero validation of what the user is passing us,
> > see an AF_UNSPEC, and say "yeah it's fine to assume there's an ipv4
> > address in there."
> 
> I couldnt accept it either ;)
> 
> By the way, if we accept it, strace() will probably still print binary
> blob instead of the IP address (not necessarily ANY address ?)
> 
> connect ( AF_UNSPEC ) has special semantic, but AFAIK, bind (AF_UNSPEC)
> only brings some mixed results : FreeBSD was accepting it in old
> versions it seems. I guess I should try current FreeBSD versions.
> 

Status on FreeBSD 8.1-RELEASE

bind(AF_UNSPEC) is accepted (converted to AF_INET), only with a 0.0.0.0
address.

Following code works :

struct sockaddr_in addr;
fd = socket(PF_INET, SOCK_STREAM, 0);
memset(&addr, 0, sizeof(addr))
bind(fd, (struct sockaddr *)&addr, sizeof(addr)); -> 0

If tried on ipv6 sockets, it doesnt work : bind() returns -1, errno=47

struct sockaddr_in6 addr;
fd = socket(PF_INET6, SOCK_STREAM, 0);
memset(&addr, 0, sizeof(addr))
bind(fd, (struct sockaddr *)&addr, sizeof(addr)); -> -1 errno=47


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