Re: [PATCH 05/19] netfilter: nf_conntrack_ipv6: improve fragmentation handling

Jesper Dangaard Brouer
2012-08-21T22:21:37Z

On Sun, 2012-08-19 at 21:44 +0200, Patrick McHardy wrote:
> On Sun, 19 Aug 2012, Jesper Dangaard Brouer wrote:
> > On Sat, 2012-08-18 at 14:26 +0200, Patrick McHardy wrote:
[...]

> > Don't I need to load some of the helper modules, or just the
> > nf_conntrack_ipv6 module, or perhaps only nf_defrag_ipv6 ?
>
> Not with the entire patchset, just IPv6 conntrack is enough. Aith IPv6 NAT
> the first packet of a connection must always be defragemented, independant
> of an assigned helper.

When loading "nf_conntrack_ipv6" I run into issues.

When sending a fragmented UDP packet. With these patches, the IPVS
stack will no longer see the fragmented packets, but instead see one
large SKB. This will trigger a MTU path check in e.g.
ip_vs_dr_xmit_v6() and an ICMPv6 too big packet is send back.

IPVS: ip_vs_dr_xmit_v6(): frag needed

Perhaps we could change/fix the MTU check in IPVS?
(This would also solve issues I've seen with TSO/GSO frames, hitting
this code path).

--
Best regards,
Jesper Dangaard Brouer
MSc.CS, Sr. Network Kernel Developer at Red Hat
Author of http://www.iptv-analyzer.org
LinkedIn: http://www.linkedin.com/in/brouer