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authorPatrick McHardy <kaber@trash.net>2006-03-20 21:52:01 -0500
committerDavid S. Miller <davem@davemloft.net>2006-03-20 21:52:01 -0500
commit4277a083ecd2c8771058641132bcecea04ca6608 (patch)
treec35d659c63fa4d64e2569e5eebd76e1b3fba9a15 /include/linux/netlink.h
parenta24276924875802853b5bdc12c56d29f1c1bbc79 (diff)
[NETLINK]: Add netlink_has_listeners for avoiding unneccessary event message generation
Keep a bitmask of multicast groups with subscribed listeners to let netlink users check for listeners before generating multicast messages. Queries don't perform any locking, which may result in false positives, it is guaranteed however that any new subscriptions are visible before bind() or setsockopt() return. Signed-off-by: Patrick McHardy <kaber@trash.net> ACKed-by: Jamal Hadi Salim<hadi@cyberus.ca> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/linux/netlink.h')
-rw-r--r--include/linux/netlink.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/netlink.h b/include/linux/netlink.h
index c256ebe2a7b4..f8f3d1c927f8 100644
--- a/include/linux/netlink.h
+++ b/include/linux/netlink.h
@@ -151,6 +151,7 @@ struct netlink_skb_parms
151 151
152extern struct sock *netlink_kernel_create(int unit, unsigned int groups, void (*input)(struct sock *sk, int len), struct module *module); 152extern struct sock *netlink_kernel_create(int unit, unsigned int groups, void (*input)(struct sock *sk, int len), struct module *module);
153extern void netlink_ack(struct sk_buff *in_skb, struct nlmsghdr *nlh, int err); 153extern void netlink_ack(struct sk_buff *in_skb, struct nlmsghdr *nlh, int err);
154extern int netlink_has_listeners(struct sock *sk, unsigned int group);
154extern int netlink_unicast(struct sock *ssk, struct sk_buff *skb, __u32 pid, int nonblock); 155extern int netlink_unicast(struct sock *ssk, struct sk_buff *skb, __u32 pid, int nonblock);
155extern int netlink_broadcast(struct sock *ssk, struct sk_buff *skb, __u32 pid, 156extern int netlink_broadcast(struct sock *ssk, struct sk_buff *skb, __u32 pid,
156 __u32 group, gfp_t allocation); 157 __u32 group, gfp_t allocation);