Re: [PATCH] net: Move specific fragmented packet to slow_path instead of dropping it

[Pablo Neira Ayuso]

On Thu, Apr 17, 2025 at 04:12:13PM +0200, Florian Westphal wrote:
> Huajian Yang <huajianyang@xxxxxxxxxxxx> wrote:
> > The config NF_CONNTRACK_BRIDGE will change the bridge forwarding for
> > fragmented packets.
> > 
> > The original bridge does not know that it is a fragmented packet and
> > forwards it directly, after NF_CONNTRACK_BRIDGE is enabled, function
> > nf_br_ip_fragment and br_ip6_fragment will check the headroom.
> > 
> > In original br_forward, insufficient headroom of skb may indeed exist,
> > but there's still a way to save the skb in the device driver after
> > dev_queue_xmit.So droping the skb will change the original bridge
> > forwarding in some cases.
> 
> Fixes: 3c171f496ef5 ("netfilter: bridge: add connection tracking system")
> Reviewed-by: Florian Westphal <fw@xxxxxxxxx>
> 
> This should probably be routed via Pablo.
> 
> Pablo, feel free to route this via nf-next if you think its not an
> urgent fix, its been like this since bridge conntrack was added.

Thanks, I will include this in the nf-next batch.