netdev - Re: some trouble when using vrf

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <f3e65ab8-0677-b2c7-2163-59b6f845a96b@cumulusnetworks.com>
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.