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Date: Tue, 24 Sep 2013 18:21:32 +0200
From: Nicolas Dichtel <nicolas.dichtel@...nd.com>
To: stephen@...workplumber.org
Cc: netdev@...r.kernel.org, davem@...emloft.net,
Nicolas Dichtel <nicolas.dichtel@...nd.com>
Subject: [PATCH net-next v2] dev: always advertise rx_flags changes
Depending on the code path, there is/isn't netlink message/call to notifier
chains when rx_flags are updated, let's send advertisement for all cases.
Signed-off-by: Nicolas Dichtel <nicolas.dichtel@...nd.com>
---
v2: rework the patch to avoid double notification
net/core/dev.c | 64 +++++++++++++++++++++++++++++++++++++---------------------
1 file changed, 41 insertions(+), 23 deletions(-)
diff --git a/net/core/dev.c b/net/core/dev.c
index 5c713f2239cc..067bfbe70c4c 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -4822,7 +4822,7 @@ static void dev_change_rx_flags(struct net_device *dev, int flags)
ops->ndo_change_rx_flags(dev, flags);
}
-static int __dev_set_promiscuity(struct net_device *dev, int inc)
+static int __dev_set_promiscuity(struct net_device *dev, int inc, bool notif)
{
unsigned int old_flags = dev->flags;
kuid_t uid;
@@ -4865,6 +4865,10 @@ static int __dev_set_promiscuity(struct net_device *dev, int inc)
dev_change_rx_flags(dev, IFF_PROMISC);
}
+ if (notif) {
+ call_netdevice_notifiers(NETDEV_CHANGE, dev);
+ rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_PROMISC);
+ }
return 0;
}
@@ -4884,7 +4888,7 @@ int dev_set_promiscuity(struct net_device *dev, int inc)
unsigned int old_flags = dev->flags;
int err;
- err = __dev_set_promiscuity(dev, inc);
+ err = __dev_set_promiscuity(dev, inc, true);
if (err < 0)
return err;
if (dev->flags != old_flags)
@@ -4893,22 +4897,9 @@ int dev_set_promiscuity(struct net_device *dev, int inc)
}
EXPORT_SYMBOL(dev_set_promiscuity);
-/**
- * dev_set_allmulti - update allmulti count on a device
- * @dev: device
- * @inc: modifier
- *
- * Add or remove reception of all multicast frames to a device. While the
- * count in the device remains above zero the interface remains listening
- * to all interfaces. Once it hits zero the device reverts back to normal
- * filtering operation. A negative @inc value is used to drop the counter
- * when releasing a resource needing all multicasts.
- * Return 0 if successful or a negative errno code on error.
- */
-
-int dev_set_allmulti(struct net_device *dev, int inc)
+static int __dev_set_allmulti(struct net_device *dev, int inc, bool notif)
{
- unsigned int old_flags = dev->flags;
+ unsigned int old_flags = dev->flags, old_gflags = dev->gflags;
ASSERT_RTNL();
@@ -4931,9 +4922,32 @@ int dev_set_allmulti(struct net_device *dev, int inc)
if (dev->flags ^ old_flags) {
dev_change_rx_flags(dev, IFF_ALLMULTI);
dev_set_rx_mode(dev);
+ if (notif) {
+ call_netdevice_notifiers(NETDEV_CHANGE, dev);
+ if (dev->gflags ^ old_gflags)
+ rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_ALLMULTI);
+ }
}
return 0;
}
+
+/**
+ * dev_set_allmulti - update allmulti count on a device
+ * @dev: device
+ * @inc: modifier
+ *
+ * Add or remove reception of all multicast frames to a device. While the
+ * count in the device remains above zero the interface remains listening
+ * to all interfaces. Once it hits zero the device reverts back to normal
+ * filtering operation. A negative @inc value is used to drop the counter
+ * when releasing a resource needing all multicasts.
+ * Return 0 if successful or a negative errno code on error.
+ */
+
+int dev_set_allmulti(struct net_device *dev, int inc)
+{
+ return __dev_set_allmulti(dev, inc, true);
+}
EXPORT_SYMBOL(dev_set_allmulti);
/*
@@ -4958,10 +4972,10 @@ void __dev_set_rx_mode(struct net_device *dev)
* therefore calling __dev_set_promiscuity here is safe.
*/
if (!netdev_uc_empty(dev) && !dev->uc_promisc) {
- __dev_set_promiscuity(dev, 1);
+ __dev_set_promiscuity(dev, 1, false);
dev->uc_promisc = true;
} else if (netdev_uc_empty(dev) && dev->uc_promisc) {
- __dev_set_promiscuity(dev, -1);
+ __dev_set_promiscuity(dev, -1, false);
dev->uc_promisc = false;
}
}
@@ -5050,9 +5064,13 @@ int __dev_change_flags(struct net_device *dev, unsigned int flags)
if ((flags ^ dev->gflags) & IFF_PROMISC) {
int inc = (flags & IFF_PROMISC) ? 1 : -1;
+ unsigned int old_flags = dev->flags;
dev->gflags ^= IFF_PROMISC;
- dev_set_promiscuity(dev, inc);
+
+ if (__dev_set_promiscuity(dev, inc, false) >= 0)
+ if (dev->flags != old_flags)
+ dev_set_rx_mode(dev);
}
/* NOTE: order of synchronization of IFF_PROMISC and IFF_ALLMULTI
@@ -5063,7 +5081,7 @@ int __dev_change_flags(struct net_device *dev, unsigned int flags)
int inc = (flags & IFF_ALLMULTI) ? 1 : -1;
dev->gflags ^= IFF_ALLMULTI;
- dev_set_allmulti(dev, inc);
+ __dev_set_allmulti(dev, inc, false);
}
return ret;
@@ -5101,13 +5119,13 @@ void __dev_notify_flags(struct net_device *dev, unsigned int old_flags)
int dev_change_flags(struct net_device *dev, unsigned int flags)
{
int ret;
- unsigned int changes, old_flags = dev->flags;
+ unsigned int changes, old_flags = dev->flags, old_gflags = dev->gflags;
ret = __dev_change_flags(dev, flags);
if (ret < 0)
return ret;
- changes = old_flags ^ dev->flags;
+ changes = (old_flags ^ dev->flags) | (old_gflags ^ dev->gflags);
if (changes)
rtmsg_ifinfo(RTM_NEWLINK, dev, changes);
--
1.8.2.1
--
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