From: "Enke Chen (enkechen)" <enkechen@cisco.com>
To: David Miller <davem@davemloft.net>
Cc: "kuznet@ms2.inr.ac.ru" <kuznet@ms2.inr.ac.ru>,
"yoshfuji@linux-ipv6.org" <yoshfuji@linux-ipv6.org>,
"netdev@vger.kernel.org" <netdev@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"xe-linux-external(mailer list)" <xe-linux-external@cisco.com>,
"Enke Chen (enkechen)" <enkechen@cisco.com>
Subject: Re: [PATCH] net: Remove the source address setting in connect() for UDP
Date: Fri, 6 Sep 2019 07:23:43 +0000 [thread overview]
Message-ID: <1DCD31CA-E94F-4127-876F-8DD355E6CF9A@cisco.com> (raw)
In-Reply-To: <20190906.091350.2133455010162259391.davem@davemloft.net>
Hi, David:
Yes, I understand the code has been there for a long time. But the issues are real, and it's really nasty when
You run into them. As I described in the patch log, there is no backward compatibility Issue for fixing it.
---
There is no backward compatibility issue here as the source address setting
in connect() is not needed anyway.
- No impact on the source address selection when the source address
is explicitly specified by "bind()", or by the "IP_PKTINFO" option.
- In the case that the source address is not explicitly specified,
the selection of the source address would be more accurate and
reliable based on the up-to-date routing table.
---
Thanks. -- Enke
-----Original Message-----
From: <linux-kernel-owner@vger.kernel.org> on behalf of David Miller <davem@davemloft.net>
Date: Friday, September 6, 2019 at 12:14 AM
To: "Enke Chen (enkechen)" <enkechen@cisco.com>
Cc: "kuznet@ms2.inr.ac.ru" <kuznet@ms2.inr.ac.ru>, "yoshfuji@linux-ipv6.org" <yoshfuji@linux-ipv6.org>, "netdev@vger.kernel.org" <netdev@vger.kernel.org>, "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>, "xe-linux-external(mailer list)" <xe-linux-external@cisco.com>
Subject: Re: [PATCH] net: Remove the source address setting in connect() for UDP
From: Enke Chen <enkechen@cisco.com>
Date: Thu, 5 Sep 2019 19:54:37 -0700
> The connect() system call for a UDP socket is for setting the destination
> address and port. But the current code mistakenly sets the source address
> for the socket as well. Remove the source address setting in connect() for
> UDP in this patch.
Do you have any idea how many decades of precedence this behavior has and
therefore how much you potentially will break userspace?
This boat has sailed a long time ago I'm afraid.
next prev parent reply other threads:[~2019-09-06 7:23 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-06 2:54 [PATCH] net: Remove the source address setting in connect() for UDP Enke Chen
2019-09-06 7:13 ` David Miller
2019-09-06 7:23 ` Enke Chen (enkechen) [this message]
2019-09-10 23:55 ` Enke Chen (enkechen)
2019-09-11 7:57 ` David Miller
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