netdev - Re: [PATCH net 1/3] ipv6: Fix datagram socket connection with DSCP.

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 for Android: free password hash cracker in your pocket

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

Message-ID: <fa2c8381-1a66-31dc-8799-2ce237071adc@kernel.org>
Date:   Thu, 9 Feb 2023 08:39:18 -0700
From:   David Ahern <dsahern@...nel.org>
To:     Guillaume Nault <gnault@...hat.com>,
        David Miller <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Eric Dumazet <edumazet@...gle.com>
Cc:     netdev@...r.kernel.org, YOSHIFUJI Hideaki <yoshfuji@...ux-ipv6.org>
Subject: Re: [PATCH net 1/3] ipv6: Fix datagram socket connection with DSCP.

On 2/8/23 10:13 AM, Guillaume Nault wrote:
> Take into account the IPV6_TCLASS socket option (DSCP) in
> ip6_datagram_flow_key_init(). Otherwise fib6_rule_match() can't
> properly match the DSCP value, resulting in invalid route lookup.
> 
> For example:
> 
>   ip route add unreachable table main 2001:db8::10/124
> 
>   ip route add table 100 2001:db8::10/124 dev eth0
>   ip -6 rule add dsfield 0x04 table 100
> 
>   echo test | socat - UDP6:[2001:db8::11]:54321,ipv6-tclass=0x04
> 
> Without this patch, socat fails at connect() time ("No route to host")
> because the fib-rule doesn't jump to table 100 and the lookup ends up
> being done in the main table.
> 
> Fixes: 2cc67cc731d9 ("[IPV6] ROUTE: Routing by Traffic Class.")
> Signed-off-by: Guillaume Nault <gnault@...hat.com>
> ---
>  net/ipv6/datagram.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 


Reviewed-by: David Ahern <dsahern@...nel.org>