netdev - Re: [PATCH v2 01/11] RDMA/CMA: Mark IPv4 addresses correctly when the listener is IPv6

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Date:	Mon, 20 Apr 2015 10:41:40 -0600
From:	Jason Gunthorpe <jgunthorpe@...idianresearch.com>
To:	Haggai Eran <haggaie@...lanox.com>
Cc:	Doug Ledford <dledford@...hat.com>,
	Roland Dreier <roland@...nel.org>,
	Sean Hefty <sean.hefty@...el.com>, linux-rdma@...r.kernel.org,
	netdev@...r.kernel.org, Liran Liss <liranl@...lanox.com>,
	Guy Shapiro <guysh@...lanox.com>,
	Shachar Raindel <raindel@...lanox.com>,
	Yotam Kenneth <yotamke@...lanox.com>,
	Or Gerlitz <ogerlitz@...lanox.com>
Subject: Re: [PATCH v2 01/11] RDMA/CMA: Mark IPv4 addresses correctly when
 the listener is IPv6

On Mon, Apr 20, 2015 at 12:03:32PM +0300, Haggai Eran wrote:
> From: Yotam Kenneth <yotamke@...lanox.com>
> 
> When accepting a new connection with the listener being IPv6, the
> family of the new connection is set as IPv6. This causes cma_zero_addr
> function to return true on an non-zero address. As a result, the wrong
> code path is taken. This causes the connection request to be rejected,
> as the RDMA-CM code looks for the wrong type of device.

This description doesn't really make sense as to what the problem is.

> @@ -866,12 +866,12 @@ static void cma_save_ip4_info(struct rdma_cm_id *id, struct rdma_cm_id *listen_i
>  
>  	listen4 = (struct sockaddr_in *) &listen_id->route.addr.src_addr;
>  	ip4 = (struct sockaddr_in *) &id->route.addr.src_addr;
> -	ip4->sin_family = listen4->sin_family;
> +	ip4->sin_family = AF_INET;

If listen_id->route.addr.src_addr.ss_family != AF_INET then it is
invalid to cast to sockaddr_in.

So listen4->sin_family MUST be AF_INET or this function MUST NOT be
called.

Forcing to AF_INET cannot be correct here.

What does this patch have to do with this series?

Jason
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