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| author | Nicolas Dichtel <nicolas.dichtel@6wind.com> | 2015-05-07 11:02:53 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2015-05-09 22:15:31 -0400 |
| commit | 59324cf35aba5336b611074028777838a963d03b (patch) | |
| tree | 67e6903c5a0204281060493d301b62640cb9a066 /include/linux/netlink.h | |
| parent | cc3a572fe6cf586f478546215bc5d3694357d71e (diff) | |
| download | lwn-59324cf35aba5336b611074028777838a963d03b.tar.gz lwn-59324cf35aba5336b611074028777838a963d03b.zip | |
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.h | 2 |
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)) |