netdev - Re: [patch net-next 0/2] Fixes for raw diag sockets handling

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Date:   Wed, 2 Nov 2016 09:36:55 -0600
From:   David Ahern <dsa@...ulusnetworks.com>
To:     Cyrill Gorcunov <gorcunov@...il.com>
Cc:     netdev@...r.kernel.org, Eric Dumazet <eric.dumazet@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Andrey Vagin <avagin@...nvz.org>,
        Stephen Hemminger <stephen@...workplumber.org>
Subject: Re: [patch net-next 0/2] Fixes for raw diag sockets handling

On 11/2/16 9:29 AM, Cyrill Gorcunov wrote:
> On Wed, Nov 02, 2016 at 09:10:32AM -0600, David Ahern wrote:
>>> @__dif != 0 the match may return socket where sk_bound_dev_if = 0
>>> instead of completely matching one. Isn't it?
>>
>> yes. I recently added an exact_dif to the lookup for listener sockets
>> (see compute_score). Something like that could be added to INET_MATCH.
> 
> Seem so. I need to revisit this moment. Because with current lookup code
> iproute2 patches I made and been testing do not kill all sockets bound
> to particular device in one pass (because request from userspace asks
> for index 15 in my case but kernel return one with index 0). At first
> I thought I made a mistake in userspace code but once I added printk's
> into kernel I found that here some strange results over lookup.

Limited to raw sockets or are you looking at multiple spec options (dev, address, port)?

I have not seen issues with tcp or udp. Running:

    ss -aK 'dev == red' 

drops all sockets bound to device 'red' (or at least signaling the socket failure for the app to handle):

root@...sie4:~# ss -ap 'dev == red'
Netid  State      Recv-Q Send-Q     Local Address:Port                      Peer Address:Port
udp    UNCONN     0      0                  *%red:12345                                *:*                     users:(("vrf-test",pid=765,fd=3))
tcp    LISTEN     0      1                  *%red:12345                                *:*                     users:(("vrf-test",pid=766,fd=3))
tcp    ESTAB      0      0         10.100.1.4%red:ssh                       10.100.1.254:60298                 users:(("sshd",pid=738,fd=3))

root@...sie4:~# ss -aKp 'dev == red'
Netid State      Recv-Q Send-Q                      Local Address:Port                                       Peer Address:Port
udp   UNCONN     0      0                                   *%red:12345                                                 *:*                     users:(("vrf-test",pid=765,fd=3))
tcp   LISTEN     0      1                                   *%red:12345                                                 *:*                     users:(("vrf-test",pid=766,fd=3))
tcp   ESTAB      0      0                          10.100.1.4%red:ssh                                        10.100.1.254:60298                 users:(("sshd",pid=738,fd=3))

root@...sie4:~# ss -ap 'dev == red'
Netid State      Recv-Q Send-Q                      Local Address:Port                                       Peer Address:Port