rtnetlink: fix fdb notification flags

[ Upstream commit 1c104a6bebf3c16b6248408b84f91d09ac8a26b6 ]

Commit 3ff661c38c84 ("net: rtnetlink notify events for FDB NTF_SELF adds and
deletes") reuses the function nlmsg_populate_fdb_fill() to notify fdb events.
But this function was used only for dump and thus was always setting the
flag NLM_F_MULTI, which is wrong in case of a single notification.

Libraries like libnl will wait forever for NLMSG_DONE.

CC: Thomas Graf <tgraf@suug.ch>
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index fd01eca..4c3087d 100644 (file)
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -1973,12 +1973,13 @@ EXPORT_SYMBOL(rtmsg_ifinfo);
 static int nlmsg_populate_fdb_fill(struct sk_buff *skb,
                                   struct net_device *dev,
                                   u8 *addr, u32 pid, u32 seq,
-                                  int type, unsigned int flags)
+                                  int type, unsigned int flags,
+                                  int nlflags)
 {
        struct nlmsghdr *nlh;
        struct ndmsg *ndm;
 
-       nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndm), NLM_F_MULTI);
+       nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndm), nlflags);
        if (!nlh)
                return -EMSGSIZE;
 
@@ -2016,7 +2017,7 @@ static void rtnl_fdb_notify(struct net_device *dev, u8 *addr, int type)
        if (!skb)
                goto errout;
 
-       err = nlmsg_populate_fdb_fill(skb, dev, addr, 0, 0, type, NTF_SELF);
+       err = nlmsg_populate_fdb_fill(skb, dev, addr, 0, 0, type, NTF_SELF, 0);
        if (err < 0) {
                kfree_skb(skb);
                goto errout;
@@ -2249,7 +2250,8 @@ static int nlmsg_populate_fdb(struct sk_buff *skb,
 
                err = nlmsg_populate_fdb_fill(skb, dev, ha->addr,
                                              portid, seq,
-                                             RTM_NEWNEIGH, NTF_SELF);
+                                             RTM_NEWNEIGH, NTF_SELF,
+                                             NLM_F_MULTI);
                if (err < 0)
                        return err;
 skip: