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

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Date:   Fri, 16 Sep 2016 13:47:57 -0600
From:   David Ahern <dsa@...ulusnetworks.com>
To:     Cyrill Gorcunov <gorcunov@...il.com>
Cc:     Eric Dumazet <eric.dumazet@...il.com>, 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 1:39 PM, Cyrill Gorcunov wrote:
> On Fri, Sep 16, 2016 at 01:30:28PM -0600, David Ahern wrote:
>>> [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.
> 
> True. To support IPPROTO_ICMP it need enhancement. I thought start with
> plain _RAW first and then extend to support _ICMP.

I thought raw in this case was SOCK_RAW as in the socket type.

Since the display is showing sockets in addition to IPPROTO_RAW:

$ ss -A raw
State      Recv-Q Send-Q        Local Address:Port                         Peer Address:Port
UNCONN     0      0                    *%eth0:icmp                                    *:*

It is going to be confusing if only ipproto-255 sockets can be killed.