diff mbox

[net-next] net: fix bridge notify hook to manage flags correctly

Message ID 20121103023236.8177.63714.stgit@localhost6.localdomain6
State Accepted, archived
Delegated to: David Miller
Headers show

Commit Message

John Fastabend Nov. 3, 2012, 2:32 a.m. UTC 
The bridge notify hook rtnl_bridge_notify() was not handling the
case where the master flags was set or with both flags set. First
flags are not being passed correctly and second the logic to parse
them is broken.

This patch passes the original flags value and fixes the
logic.

Reported-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: John Fastabend <john.r.fastabend@intel.com>
---

 net/core/rtnetlink.c |   26 ++++++++++++++++++--------
 1 files changed, 18 insertions(+), 8 deletions(-)


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Comments

David Miller Nov. 3, 2012, 7:38 p.m. UTC | #1 
From: John Fastabend <john.r.fastabend@intel.com>
Date: Fri, 02 Nov 2012 19:32:36 -0700

> The bridge notify hook rtnl_bridge_notify() was not handling the
> case where the master flags was set or with both flags set. First
> flags are not being passed correctly and second the logic to parse
> them is broken.
> 
> This patch passes the original flags value and fixes the
> logic.
> 
> Reported-by: Ben Hutchings <bhutchings@solarflare.com>
> Signed-off-by: John Fastabend <john.r.fastabend@intel.com>

Applied.
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diff mbox

Patch

diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index 51dc58f..7eae53b 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -2373,13 +2373,19 @@  static int rtnl_bridge_notify(struct net_device *dev, u16 flags)
 		goto errout;
 	}
 
-	if (!flags && master && master->netdev_ops->ndo_bridge_getlink)
+	if ((!flags || (flags & BRIDGE_FLAGS_MASTER)) &&
+	    master && master->netdev_ops->ndo_bridge_getlink) {
 		err = master->netdev_ops->ndo_bridge_getlink(skb, 0, 0, dev);
-	else if (dev->netdev_ops->ndo_bridge_getlink)
-		err = dev->netdev_ops->ndo_bridge_getlink(skb, 0, 0, dev);
+		if (err < 0)
+			goto errout;
+	}
 
-	if (err < 0)
-		goto errout;
+	if ((flags & BRIDGE_FLAGS_SELF) &&
+	    dev->netdev_ops->ndo_bridge_getlink) {
+		err = dev->netdev_ops->ndo_bridge_getlink(skb, 0, 0, dev);
+		if (err < 0)
+			goto errout;
+	}
 
 	rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC);
 	return 0;
@@ -2398,7 +2404,8 @@  static int rtnl_bridge_setlink(struct sk_buff *skb, struct nlmsghdr *nlh,
 	struct net_device *dev;
 	struct nlattr *br_spec, *attr = NULL;
 	int rem, err = -EOPNOTSUPP;
-	u16 flags = 0;
+	u16 oflags, flags = 0;
+	bool have_flags = false;
 
 	if (nlmsg_len(nlh) < sizeof(*ifm))
 		return -EINVAL;
@@ -2417,12 +2424,15 @@  static int rtnl_bridge_setlink(struct sk_buff *skb, struct nlmsghdr *nlh,
 	if (br_spec) {
 		nla_for_each_nested(attr, br_spec, rem) {
 			if (nla_type(attr) == IFLA_BRIDGE_FLAGS) {
+				have_flags = true;
 				flags = nla_get_u16(attr);
 				break;
 			}
 		}
 	}
 
+	oflags = flags;
+
 	if (!flags || (flags & BRIDGE_FLAGS_MASTER)) {
 		if (!dev->master ||
 		    !dev->master->netdev_ops->ndo_bridge_setlink) {
@@ -2447,11 +2457,11 @@  static int rtnl_bridge_setlink(struct sk_buff *skb, struct nlmsghdr *nlh,
 			flags &= ~BRIDGE_FLAGS_SELF;
 	}
 
-	if (attr && nla_type(attr) == IFLA_BRIDGE_FLAGS)
+	if (have_flags)
 		memcpy(nla_data(attr), &flags, sizeof(flags));
 	/* Generate event to notify upper layer of bridge change */
 	if (!err)
-		err = rtnl_bridge_notify(dev, flags);
+		err = rtnl_bridge_notify(dev, oflags);
 out:
 	return err;
 }