lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  PHC 
Open Source and information security mailing list archives
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [day] [month] [year] [list]
Date:	Sun, 29 Jul 2012 14:24:02 +0200
From:	Philipp Kern <>
To:	Joe Perches <>
	"David S. Miller" <>,
	Alexey Kuznetsov <>,
	James Morris <>,
	Hideaki YOSHIFUJI <>,
	Patrick McHardy <>,,
Subject: Re: [PATCH] net: move "IPv6: sending pkt_too_big to self" to NETDEBUG

On Sat, Jul 28, 2012 at 10:29:20AM -0700, Joe Perches wrote:
> On Sat, 2012-07-28 at 17:06 +0200, Philipp Kern wrote:
> > ip6_xmit checks if the outgoing packet is larger than the path MTU and
> > emits ICMPv6 packet too big locally if this is the case. Logging this,
> > even at KERN_DEBUG, confuses users. It is also not actually helpful for
> > debugging, given that there is no reference to the connection that
> > triggered this event.
> []
> > diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c
> []
> > @@ -241,7 +241,7 @@ int ip6_xmit(struct sock *sk, struct sk_buff *skb, struct flowi6 *fl6,
> >  			       dst->dev, dst_output);
> >  	}
> >  
> > -	net_dbg_ratelimited("IPv6: sending pkt_too_big to self\n");
> > +	LIMIT_NETDEBUG("IPv6: sending pkt_too_big to self\n");
> LIMIT_NETDEBUG doesn't include a logging level.
> Add a KERN_DEBUG prefix or another KERN_<LEVEL>.

True, sorry, and thanks. That got lost with the change to net_dbg_ratelimited.

> Maybe it'd be better to add the context too.

Right. What kind of context do you want to see? Would saddr, daddr and dst_mtu
be enough? What about skb->len / local_df / skb_is_gso (which are in the
condition of the preceding if)?

Kind regards
Philipp Kern

Download attachment "signature.asc" of type "application/pgp-signature" (589 bytes)

Powered by blists - more mailing lists