Re: [patch v1, kernel version 3.2.1] rtnetlink workaround around the skb buff size issue

Le lundi 06 février 2012 à 10:15 -0500, David Miller a écrit :

From: Štefan Gula <redacted>
Date: Mon, 6 Feb 2012 09:53:28 +0100

quoted

If I try to request for it, it will eventually fail with a lot of
records even with filtering...

Then the user can loop increasing the buffer size until the netlink
request succeeds.

It is not a problem.

Actually we always truncate message in netlink_recvmsg()

We could use a MSG_NOPARTIAL flag in netlink_recvmsg() so that user can
avoid the MSG_PEEK operation to fetch next message length.

(Ie not consume/copy skb if user buffer is too small to hold full
message, and only return the needed length)