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authorNicolas Dichtel <nicolas.dichtel@6wind.com>2015-05-07 11:02:53 +0200
committerDavid S. Miller <davem@davemloft.net>2015-05-09 22:15:31 -0400
commit59324cf35aba5336b611074028777838a963d03b (patch)
tree67e6903c5a0204281060493d301b62640cb9a066 /include/linux/netlink.h
parentcc3a572fe6cf586f478546215bc5d3694357d71e (diff)
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 <nicolas.dichtel@6wind.com> Acked-by: Thomas Graf <tgraf@suug.ch> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/linux/netlink.h')
-rw-r--r--include/linux/netlink.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/netlink.h b/include/linux/netlink.h
index 6835c1279df7..9120edb650a0 100644
--- a/include/linux/netlink.h
+++ b/include/linux/netlink.h
@@ -28,6 +28,8 @@ struct netlink_skb_parms {
__u32 dst_group;
__u32 flags;
struct sock *sk;
+ bool nsid_is_set;
+ int nsid;
};
#define NETLINK_CB(skb) (*(struct netlink_skb_parms*)&((skb)->cb))