linux-kernel - Re: some trouble when using vrf

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Date:   Tue, 16 Apr 2019 22:56:01 -0600
From:   David Ahern <dsa@...ulusnetworks.com>
To:     linmiaohe <linmiaohe@...wei.com>, shrijeet@...il.com,
        davem@...emloft.net, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Mingfangsen <mingfangsen@...wei.com>
Subject: Re: some trouble when using vrf

On 4/16/19 8:22 PM, linmiaohe wrote:
> 
> 
> On 2019/4/16 23:20, David Ahern wrote:
>> On 4/16/19 5:26 AM, linmiaohe wrote:
>>>     ...
>>>     bind(sock_fd, (struct sockaddr *)&addr_serv, sizeof(addr_serv));
>>>     ...
>>>     ret = setsockopt(sock_fd, SOL_SOCKET, SO_BINDTODEVICE, bind_dev, strlen(bind_dev)+1);
>>>     ...
>>>     This code snipet doesn't work if the ip address of addr_serv is not in default vrf. And
>>> "Cannot assign requested address" will occurs.
>>
>> Applications must bind to the device first and then bind to the local
>> address. As I recall this applies regardless of whether it is a VRF or
>> other.
>>
>>
> It should be, but unfortunately some applications break this.
> 

Sure, I have an open item on my to-do list about re-verifying bound
addresses when the device binding changes (and vice versa). This is not
a problem VRF introduced, but VRF use case does bring more attention to it.