netdev - Re: [PATCH net-next 8/8] net/dst: do not confirm neighbor for vxlan and geneve pmtu update

lists.openwall.net		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 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20191219174935.GB14566@linux.home>
Date:   Thu, 19 Dec 2019 18:49:35 +0100
From:   Guillaume Nault <gnault@...hat.com>
To:     Hangbin Liu <liuhangbin@...il.com>
Cc:     netdev@...r.kernel.org, Julian Anastasov <ja@....bg>,
        Marcelo Ricardo Leitner <marcelo.leitner@...il.com>,
        David Ahern <dsahern@...il.com>,
        Eric Dumazet <edumazet@...gle.com>,
        David Miller <davem@...emloft.net>,
        Pablo Neira <pablo@...filter.org>,
        Stephen Hemminger <stephen@...workplumber.org>,
        Alexey Kodanev <alexey.kodanev@...cle.com>
Subject: Re: [PATCH net-next 8/8] net/dst: do not confirm neighbor for vxlan
 and geneve pmtu update

On Wed, Dec 18, 2019 at 07:53:13PM +0800, Hangbin Liu wrote:
> When do IPv6 tunnel PMTU update and calls __ip6_rt_update_pmtu() in the end,
> we should not call dst_confirm_neigh() as there is no two-way communication.
> 
> So disable the neigh confirm for vxlan and geneve pmtu update.
> 
> Signed-off-by: Hangbin Liu <liuhangbin@...il.com>
> ---
>  include/net/dst.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/include/net/dst.h b/include/net/dst.h
> index 208e7c0c89d8..626cf614ad86 100644
> --- a/include/net/dst.h
> +++ b/include/net/dst.h
> @@ -535,7 +535,7 @@ static inline void skb_tunnel_check_pmtu(struct sk_buff *skb,
>  	u32 encap_mtu = dst_mtu(encap_dst);
>  
>  	if (skb->len > encap_mtu - headroom)
> -		skb_dst_update_pmtu(skb, encap_mtu - headroom);
> +		skb_dst_update_pmtu_no_confirm(skb, encap_mtu - headroom);
>  }
>  

Fixes: a93bf0ff4490 ("vxlan: update skb dst pmtu on tx path")
Fixes: 52a589d51f10 ("geneve: update skb dst pmtu on tx path")