ipmr: fix mfc notification flags

Commit 8cd3ac9f9b7b ("ipmr: advertise new mfc entries via rtnl") reuses the
function ipmr_fill_mroute() to notify mfc 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>

diff --git a/net/ipv4/ipmr.c b/net/ipv4/ipmr.c
index b9b3472975ba31a646502dcd8c76046869be4e98..28863570dd60557ca27d8c73c7590b926c7dcf57 100644 (file)
--- a/net/ipv4/ipmr.c
+++ b/net/ipv4/ipmr.c
@@ -2255,13 +2255,14 @@ int ipmr_get_route(struct net *net, struct sk_buff *skb,
 }
 
 static int ipmr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb,
-                           u32 portid, u32 seq, struct mfc_cache *c, int cmd)
+                           u32 portid, u32 seq, struct mfc_cache *c, int cmd,
+                           int flags)
 {
        struct nlmsghdr *nlh;
        struct rtmsg *rtm;
        int err;
 
-       nlh = nlmsg_put(skb, portid, seq, cmd, sizeof(*rtm), NLM_F_MULTI);
+       nlh = nlmsg_put(skb, portid, seq, cmd, sizeof(*rtm), flags);
        if (nlh == NULL)
                return -EMSGSIZE;
 
@@ -2329,7 +2330,7 @@ static void mroute_netlink_event(struct mr_table *mrt, struct mfc_cache *mfc,
        if (skb == NULL)
                goto errout;
 
-       err = ipmr_fill_mroute(mrt, skb, 0, 0, mfc, cmd);
+       err = ipmr_fill_mroute(mrt, skb, 0, 0, mfc, cmd, 0);
        if (err < 0)
                goto errout;
 
@@ -2368,7 +2369,8 @@ static int ipmr_rtm_dumproute(struct sk_buff *skb, struct netlink_callback *cb)
                                if (ipmr_fill_mroute(mrt, skb,
                                                     NETLINK_CB(cb->skb).portid,
                                                     cb->nlh->nlmsg_seq,
-                                                    mfc, RTM_NEWROUTE) < 0)
+                                                    mfc, RTM_NEWROUTE,
+                                                    NLM_F_MULTI) < 0)
                                        goto done;
 next_entry:
                                e++;
@@ -2382,7 +2384,8 @@ next_entry:
                        if (ipmr_fill_mroute(mrt, skb,
                                             NETLINK_CB(cb->skb).portid,
                                             cb->nlh->nlmsg_seq,
-                                            mfc, RTM_NEWROUTE) < 0) {
+                                            mfc, RTM_NEWROUTE,
+                                            NLM_F_MULTI) < 0) {
                                spin_unlock_bh(&mfc_unres_lock);
                                goto done;
                        }