From: Nicolas Dichtel <nicolas.dichtel@xxxxxxxxx>
3.12-stable review patch. If anyone has any objections, please let me know.
===============
[ Upstream commit 65886f439ab0fdc2dff20d1fa87afb98c6717472 ]
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@xxxxxxx>
Signed-off-by: Nicolas Dichtel <nicolas.dichtel@xxxxxxxxx>
Acked-by: Thomas Graf <tgraf@xxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Jiri Slaby <jslaby@xxxxxxx>
---
net/ipv4/ipmr.c | 13 ++++++++-----
1 file changed, 8 insertions(+), 5 deletions(-)
diff --git a/net/ipv4/ipmr.c b/net/ipv4/ipmr.c
index 1672409f5ba5..6fbf3393d842 100644
--- a/net/ipv4/ipmr.c
+++ b/net/ipv4/ipmr.c
@@ -2253,13 +2253,14 @@ 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;
@@ -2327,7 +2328,7 @@ 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;
@@ -2366,7 +2367,8 @@ 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++;
@@ -2380,7 +2382,8 @@ 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;
}
--
1.9.2
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