linux-kernel - Re: [PATCH v3] net: ip, diag -- Add diag interface for raw sockets

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Date:   Fri, 16 Sep 2016 13:30:28 -0600
From:   David Ahern <dsa@...ulusnetworks.com>
To:     Cyrill Gorcunov <gorcunov@...il.com>,
        Eric Dumazet <eric.dumazet@...il.com>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        David Miller <davem@...emloft.net>, kuznet@....inr.ac.ru,
        jmorris@...ei.org, yoshfuji@...ux-ipv6.org, kaber@...sh.net,
        avagin@...nvz.org, stephen@...workplumber.org
Subject: Re: [PATCH v3] net: ip, diag -- Add diag interface for raw sockets

On 9/16/16 1:00 PM, Cyrill Gorcunov wrote:
> I created veth pair and bound raw socket into it.
> 
> [root@...7 iproute2]# misc/ss -A raw
> State      Recv-Q Send-Q                                Local Address:Port                                                 Peer Address:Port                
> ESTAB      0      0                                         127.0.0.1:ipproto-255                                            127.0.0.10:ipproto-9090         
> UNCONN     0      0                                        127.0.0.10:ipproto-255                                                     *:*                    
> UNCONN     0      0                                                :::ipv6-icmp                                                      :::*                    
> UNCONN     0      0                                                :::ipv6-icmp                                                      :::*                    
> ESTAB      0      0                                               ::1:ipproto-255                                                   ::1:ipproto-9091         
> UNCONN     0      0                                           ::1%vm1:ipproto-255                                                    :::*                    
> [root@...7 iproute2]# 
> 
> [root@...7 iproute2]# misc/ss -aKw 'dev == vm1'
> State      Recv-Q Send-Q                                Local Address:Port                                                 Peer Address:Port                
> UNCONN     0      0                                           ::1%vm1:ipproto-255                                                    :::*                    
> 
> [root@...7 iproute2]# misc/ss -A raw
> State      Recv-Q Send-Q                                Local Address:Port                                                 Peer Address:Port                
> ESTAB      0      0                                         127.0.0.1:ipproto-255                                            127.0.0.10:ipproto-9090         
> UNCONN     0      0                                        127.0.0.10:ipproto-255                                                     *:*                    
> UNCONN     0      0                                                :::ipv6-icmp                                                      :::*                    
> UNCONN     0      0                                                :::ipv6-icmp                                                      :::*                    
> ESTAB      0      0                                               ::1:ipproto-255                                                   ::1:ipproto-9091         
> 
> so it get zapped out. Is there some other way to test it?
> 

I'm guessing you passed IPPROTO_RAW (255) as the protocol to socket(). If you pass something else (IPPROTO_ICMP for example) it won't work.