From: Nicolas Dichtel Date: Thu, 7 May 2015 09:02:53 +0000 (+0200) Subject: netlink: allow to listen "all" netns X-Git-Tag: omap-for-v4.2/fixes-rc1^2~134^2~335^2 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=59324cf35aba5336b611074028777838a963d03b;p=pandora-kernel.git netlink: allow to listen "all" netns More accurately, listen all netns that have a nsid assigned into the netns where the netlink socket is opened. For this purpose, a netlink socket option is added: NETLINK_LISTEN_ALL_NSID. When this option is set on a netlink socket, this socket will receive netlink notifications from all netns that have a nsid assigned into the netns where the socket has been opened. The nsid is sent to userland via an anscillary data. With this patch, a daemon needs only one socket to listen many netns. This is useful when the number of netns is high. Because 0 is a valid value for a nsid, the field nsid_is_set indicates if the field nsid is valid or not. skb->cb is initialized to 0 on skb allocation, thus we are sure that we will never send a nsid 0 by error to the userland. Signed-off-by: Nicolas Dichtel Acked-by: Thomas Graf Signed-off-by: David S. Miller --- Reading git-diff-tree failed