netdev - [PATCH] net: netlink: don't try unicast when dst_pid is zero for NETLINK

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Message-Id: <1305267894-3314-1-git-send-email-xiaosuo@gmail.com>
Date:	Fri, 13 May 2011 14:24:54 +0800
From:	Changli Gao <xiaosuo@...il.com>
To:	"David S. Miller" <davem@...emloft.net>
Cc:	netdev@...r.kernel.org, Changli Gao <xiaosuo@...il.com>
Subject: [PATCH] net: netlink: don't try unicast when dst_pid is zero for NETLINK_USERSOCK

For NETLINK_USERSOCK, no one listens on PID 0, so sending a message only to
to a multicast group should not return -ECONNREFUSED.

Signed-off-by: Changli Gao <xiaosuo@...il.com>
---
 net/netlink/af_netlink.c |    2 ++
 1 file changed, 2 insertions(+)
diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c
index c8f35b5..ba89304 100644
--- a/net/netlink/af_netlink.c
+++ b/net/netlink/af_netlink.c
@@ -1379,6 +1379,8 @@ static int netlink_sendmsg(struct kiocb *kiocb, struct socket *sock,
 	if (dst_group) {
 		atomic_inc(&skb->users);
 		netlink_broadcast(sk, skb, dst_pid, dst_group, GFP_KERNEL);
+		if (dst_pid == 0 && sk->sk_protocol == NETLINK_USERSOCK)
+			return len;
 	}
 	err = netlink_unicast(sk, skb, dst_pid, msg->msg_flags&MSG_DONTWAIT);

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