Commit 4f7eff10 authored by Johannes Berg's avatar Johannes Berg
Browse files

nl80211: fix netns separation

There are currently a few ways to "escape"
the network namespace and access a wiphy
that belongs to another namespace. Add a
netns argument to the relevant functions
to fix this.

One remaining issue with testmode will be
fixed in a follow-up patch.
Signed-off-by: default avatarJohannes Berg <>
parent 7fee4778
......@@ -71,7 +71,7 @@ static int get_rdev_dev_by_ifindex(struct net *netns, struct nlattr **attrs,
static struct cfg80211_registered_device *
__cfg80211_rdev_from_info(struct genl_info *info)
__cfg80211_rdev_from_info(struct net *netns, struct genl_info *info)
struct cfg80211_registered_device *rdev = NULL, *tmp;
struct net_device *netdev;
......@@ -88,7 +88,7 @@ __cfg80211_rdev_from_info(struct genl_info *info)
if (info->attrs[NL80211_ATTR_IFINDEX]) {
int ifindex = nla_get_u32(info->attrs[NL80211_ATTR_IFINDEX]);
netdev = dev_get_by_index(genl_info_net(info), ifindex);
netdev = dev_get_by_index(netns, ifindex);
if (netdev) {
if (netdev->ieee80211_ptr)
tmp = wiphy_to_dev(
......@@ -110,10 +110,13 @@ __cfg80211_rdev_from_info(struct genl_info *info)
if (rdev)
return rdev;
if (!rdev)
return ERR_PTR(-ENODEV);
return ERR_PTR(-ENODEV);
if (netns != wiphy_net(&rdev->wiphy))
return ERR_PTR(-ENODEV);
return rdev;
......@@ -137,12 +140,12 @@ __cfg80211_rdev_from_info(struct genl_info *info)
* be checked with IS_ERR() for errors.
static struct cfg80211_registered_device *
cfg80211_get_dev_from_info(struct genl_info *info)
cfg80211_get_dev_from_info(struct net *netns, struct genl_info *info)
struct cfg80211_registered_device *rdev;
rdev = __cfg80211_rdev_from_info(info);
rdev = __cfg80211_rdev_from_info(netns, info);
/* if it is not an error we grab the lock on
* it to assure it won't be going away while
......@@ -1419,7 +1422,7 @@ static int nl80211_set_wiphy(struct sk_buff *skb, struct genl_info *info)
if (!netdev) {
rdev = __cfg80211_rdev_from_info(info);
rdev = __cfg80211_rdev_from_info(genl_info_net(info), info);
if (IS_ERR(rdev)) {
return PTR_ERR(rdev);
......@@ -6623,7 +6626,7 @@ static int nl80211_pre_doit(struct genl_ops *ops, struct sk_buff *skb,
if (ops->internal_flags & NL80211_FLAG_NEED_WIPHY) {
rdev = cfg80211_get_dev_from_info(info);
rdev = cfg80211_get_dev_from_info(genl_info_net(info), info);
if (IS_ERR(rdev)) {
if (rtnl)
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