linux-kernel - Re: some trouble when using vrf

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Message-ID: <224d8389-bbca-2240-fe52-dd8030420acd@huawei.com>
Date:   Wed, 17 Apr 2019 14:52:30 +0800
From:   linmiaohe <linmiaohe@...wei.com>
To:     David Ahern <dsa@...ulusnetworks.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 2019/4/17 12:56, David Ahern wrote:
> 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.
> 
> 

Cherrs! I can't wait to enjoy the source code of the item. Please let
me know if you work out it. Thanks a lot.