netdev - Re: [PATCH] net: ipv4: Cache pmtu for all packet paths if multipath enabled

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: <D5F9OJYSMFXS.2HOGXNFVKTOLL@verdict.gg>
Date: Wed, 06 Nov 2024 20:20:55 +0300
From: "Vladimir Vdovin" <deliran@...dict.gg>
To: "David Ahern" <dsahern@...nel.org>, "Ido Schimmel" <idosch@...sch.org>
Cc: <netdev@...r.kernel.org>, <davem@...emloft.net>
Subject: Re: [PATCH] net: ipv4: Cache pmtu for all packet paths if multipath
 enabled

On Tue Nov 5, 2024 at 6:52 AM MSK, David Ahern wrote:
> On 11/2/24 10:20 AM, Vladimir Vdovin wrote:
> >>
> >> Doesn't IPv6 suffer from a similar problem?
>
> I believe the answer is yes, but do not have time to find a reproducer
> right now.
>
> > 
> > I am not very familiar with ipv6,
> > but I tried to reproduce same problem with my tests with same topology.
> > 
> > ip netns exec ns_a-AHtoRb ip -6 r g fc00:1001::2:2 sport 30003 dport 443
> > fc00:1001::2:2 via fc00:2::2 dev veth_A-R2 src fc00:1000::1:1 metric 1024 expires 495sec mtu 1500 pref medium
> > 
> > ip netns exec ns_a-AHtoRb ip -6 r g fc00:1001::2:2 sport 30013 dport 443
> > fc00:1001::2:2 via fc00:1::2 dev veth_A-R1 src fc00:1000::1:1 metric 1024 expires 484sec mtu 1500 pref medium
> > 
> > It seems that there are no problems with ipv6. We have nhce entries for both paths.
>
> Does rt6_cache_allowed_for_pmtu return true or false for this test?
It returns true.