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authorNicolas Dichtel <nicolas.dichtel@6wind.com>2015-05-07 11:02:53 +0200
committerDavid S. Miller <davem@davemloft.net>2015-05-10 04:15:31 +0200
commit59324cf35aba5336b611074028777838a963d03b (patch)
tree67e6903c5a0204281060493d301b62640cb9a066 /include
parentnetlink: rename private flags and states (diff)
downloadlinux-59324cf35aba5336b611074028777838a963d03b.tar.xz
linux-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')
-rw-r--r--include/linux/netlink.h2
-rw-r--r--include/net/net_namespace.h2
-rw-r--r--include/uapi/linux/netlink.h1
3 files changed, 5 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))
diff --git a/include/net/net_namespace.h b/include/net/net_namespace.h
index 6d1e2eae32fb..3f850acc844e 100644
--- a/include/net/net_namespace.h
+++ b/include/net/net_namespace.h
@@ -272,6 +272,8 @@ static inline struct net *read_pnet(const possible_net_t *pnet)
#endif
int peernet2id_alloc(struct net *net, struct net *peer);
+int peernet2id(struct net *net, struct net *peer);
+bool peernet_has_id(struct net *net, struct net *peer);
struct net *get_net_ns_by_id(struct net *net, int id);
struct pernet_operations {
diff --git a/include/uapi/linux/netlink.h b/include/uapi/linux/netlink.h
index 1a85940f8ab7..3e34b7d702f8 100644
--- a/include/uapi/linux/netlink.h
+++ b/include/uapi/linux/netlink.h
@@ -108,6 +108,7 @@ struct nlmsgerr {
#define NETLINK_NO_ENOBUFS 5
#define NETLINK_RX_RING 6
#define NETLINK_TX_RING 7
+#define NETLINK_LISTEN_ALL_NSID 8
struct nl_pktinfo {
__u32 group;