netdev - Re: [RFC] The Linux kernel IPv6 stack don't follow the RFC 4942 recommendation

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Date:	Thu, 10 Nov 2011 04:54:08 -0800 (PST)
From:	François-Xavier Le Bail <fx.lebail@...oo.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [RFC] The Linux kernel IPv6 stack don't follow the RFC 4942 recommendation





----- Original Message -----
> From: Eric Dumazet <eric.dumazet@...il.com>
> To: François-Xavier Le Bail <fx.lebail@...oo.com>
> Cc: "netdev@...r.kernel.org" <netdev@...r.kernel.org>
> Sent: Thursday, November 10, 2011 12:27 PM
> Subject: Re: [RFC] The Linux kernel IPv6 stack don't follow the RFC 4942 recommendation
> 
> Le jeudi 10 novembre 2011 à 02:58 -0800, François-Xavier Le Bail a
> écrit :
>>  ----- Original Message -----
>> 
>>  > From: Eric Dumazet <eric.dumazet@...il.com>
>>  > To: François-Xavier Le Bail <fx.lebail@...oo.com>
>>  > Cc: "netdev@...r.kernel.org" <netdev@...r.kernel.org>
>>  > Sent: Saturday, November 5, 2011 10:30 AM
>>  > Subject: Re: [RFC] The Linux kernel IPv6 stack don't follow the 
> RFC 4942 recommendation
>>  > 
>>  > Le samedi 05 novembre 2011 à 01:39 -0700, François-Xavier Le Bail a
>>  > écrit :
>>  > 
>>  >> 
>>  >>  I will study and test these options for my application server
>>  > 
>>  > Here is a sample of use of the IPv4 part, an udpecho service that use
>>  > IP_PKTINFO and IP_RECVTOS/IP_TOS to be able to use multihomed machine,
>>  > and reflect TOS field as well.
>>  > [. . .]
>> 
>>  Hi,
>> 
>>  I have updated the code for IPv6.
>> 
>>  When a UDP client send to an unicast address on a multihomed Linux 3.0.0 
> host, from another host, it's OK.
>>  For example :
>>  setup 2001::1 on eth0, 2a01::1 on eth1.
>>  send to 2001::1, recv from 2001::1.
>>  send to 2a01::1, recv from 2a01::1.
>> 
>>  When the UDP client send to an Subnet-Router anycast address on a 
> multihomed Linux 3.0.0 host, from another host, it's KO.
>>  send to 2001:: or 2a01::, the udpecho server display "sendmsg: Invalid 
> argument".
>> 
>>  Any idea ?
> 
> Could you describe the setup of this machine ?
> 
> ip -6 addr
> ip -6 ro

The server has ipv6 forwarding on.

# ip -6 a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qlen 1000
    inet6 2a01::1/64 scope global 
       valid_lft forever preferred_lft forever
    inet6 fe80::20c:29ff:fecc:bc43/64 scope link 
       valid_lft forever preferred_lft forever
3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qlen 1000
    inet6 2001::1/64 scope global 
       valid_lft forever preferred_lft forever
    inet6 fe80::20c:29ff:fecc:bc4d/64 scope link 
       valid_lft forever preferred_lft forever

# ip -6 r
2001::/64 dev eth1  proto kernel  metric 256 
2a01::/64 dev eth0  proto kernel  metric 256 
fe80::/64 dev eth1  proto kernel  metric 256 
fe80::/64 dev eth0  proto kernel  metric 256 
default via 2001::2 dev eth1  metric 1024 

2001::2 is the address of the other (client) host.
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