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cfg80211: always notify userspace of new wireless netdevs

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This change alters the semantics of NL80211_CMD_NEW_INTERFACE events
by always sending this event whenever a new net_device object
associated with a wdev is registered.  Prior to this change, this event
was only sent as a result of NL80211_CMD_NEW_INTERFACE command sent
from userspace.  This allows userspace to reliably detect new wireless
interfaces (e.g. due to hardware hot-plug events, etc).

For wdevs created without an associated net_device object (e.g.
NL80211_IFTYPE_P2P_DEVICE), the NL80211_CMD_NEW_INTERFACE event is
still generated inside the relevant nl80211 command handler.

Signed-off-by: Denis Kenzior <denkenz@gmail.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Denis Kenzior 2016-08-03 16:58:33 -05:00 committed by Johannes Berg
parent eae4430ee7
commit 896ff0635a
3 changed files with 37 additions and 14 deletions
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2
net/wireless/core.c
View file

@ -1079,6 +1079,8 @@ static int cfg80211_netdev_notifier_call(struct notifier_block *nb,
wdev->iftype == NL80211_IFTYPE_P2P_CLIENT ||
wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
dev->priv_flags |= IFF_DONT_BRIDGE;
nl80211_notify_iface(rdev, wdev, NL80211_CMD_NEW_INTERFACE);
break;
case NETDEV_GOING_DOWN:
cfg80211_leave(rdev, wdev);

46
net/wireless/nl80211.c
View file

@ -2751,7 +2751,7 @@ static int nl80211_new_interface(struct sk_buff *skb, struct genl_info *info)
struct cfg80211_registered_device *rdev = info->user_ptr[0];
struct vif_params params;
struct wireless_dev *wdev;
struct sk_buff *msg, *event;
struct sk_buff *msg;
int err;
enum nl80211_iftype type = NL80211_IFTYPE_UNSPECIFIED;
u32 flags;
@ -2855,20 +2855,15 @@ static int nl80211_new_interface(struct sk_buff *skb, struct genl_info *info)
return -ENOBUFS;
}
event = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
if (event) {
if (nl80211_send_iface(event, 0, 0, 0,
rdev, wdev, false) < 0) {
nlmsg_free(event);
goto out;
}
/*
* For wdevs which have no associated netdev object (e.g. of type
* NL80211_IFTYPE_P2P_DEVICE), emit the NEW_INTERFACE event here.
* For all other types, the event will be generated from the
* netdev notifier
*/
if (!wdev->netdev)
nl80211_notify_iface(rdev, wdev, NL80211_CMD_NEW_INTERFACE);
genlmsg_multicast_netns(&nl80211_fam, wiphy_net(&rdev->wiphy),
event, 0, NL80211_MCGRP_CONFIG,
GFP_KERNEL);
}
out:
return genlmsg_reply(msg, info);
}
@ -11847,6 +11842,29 @@ void nl80211_notify_wiphy(struct cfg80211_registered_device *rdev,
NL80211_MCGRP_CONFIG, GFP_KERNEL);
}
void nl80211_notify_iface(struct cfg80211_registered_device *rdev,
struct wireless_dev *wdev,
enum nl80211_commands cmd)
{
struct sk_buff *msg;
WARN_ON(cmd != NL80211_CMD_NEW_INTERFACE &&
cmd != NL80211_CMD_DEL_INTERFACE);
msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
if (!msg)
return;
if (nl80211_send_iface(msg, 0, 0, 0, rdev, wdev,
cmd == NL80211_CMD_DEL_INTERFACE) < 0) {
nlmsg_free(msg);
return;
}
genlmsg_multicast_netns(&nl80211_fam, wiphy_net(&rdev->wiphy), msg, 0,
NL80211_MCGRP_CONFIG, GFP_KERNEL);
}
static int nl80211_add_scan_req(struct sk_buff *msg,
struct cfg80211_registered_device *rdev)
{

3
net/wireless/nl80211.h
View file

@ -7,6 +7,9 @@ int nl80211_init(void);
void nl80211_exit(void);
void nl80211_notify_wiphy(struct cfg80211_registered_device *rdev,
enum nl80211_commands cmd);
void nl80211_notify_iface(struct cfg80211_registered_device *rdev,
struct wireless_dev *wdev,
enum nl80211_commands cmd);
void nl80211_send_scan_start(struct cfg80211_registered_device *rdev,
struct wireless_dev *wdev);
struct sk_buff *nl80211_build_scan_msg(struct cfg80211_registered_device *rdev,