nl80211: Don't verify owner_nlportid on NAN commands

If NAN interface is created with NL80211_ATTR_SOCKET_OWNER, the socket
that is used to create the interface is used for all NAN operations and
reporting NAN events.
However, it turns out that sending commands and receiving events on
the same socket is not possible in a completely race-free way:
If the socket buffer is overflowed by the events, the command response
will not be sent. In that case the caller will block forever on recv.
Using non-blocking socket for commands is more complicated and still
the command response or ack may not be received.
So, keep unicasting NAN events to the interface creator, but allow
using a different socket for commands.

Signed-off-by: Andrei Otcheretianski <andrei.otcheretianski@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Reviewed-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

include/uapi/linux/nl80211.h

@@ -1909,11 +1909,10 @@ enum nl80211_commands {
  *	that configured the indoor setting, and the indoor operation would be
  *	cleared when the socket is closed.
  *	If set during NAN interface creation, the interface will be destroyed
- *	if the socket is closed just like any other interface. Moreover, only
- *	the netlink socket that created the interface will be allowed to add
- *	and remove functions. NAN notifications will be sent in unicast to that
- *	socket. Without this attribute, any socket can add functions and the
- *	notifications will be sent to the %NL80211_MCGRP_NAN multicast group.
+ *	if the socket is closed just like any other interface. Moreover, NAN
+ *	notifications will be sent in unicast to that socket. Without this
+ *	attribute, the notifications will be sent to the %NL80211_MCGRP_NAN
+ *	multicast group.
  *	If set during %NL80211_CMD_ASSOCIATE or %NL80211_CMD_CONNECT the
  *	station will deauthenticate when the socket is closed.
  *

net/wireless/nl80211.c

@@ -11206,10 +11206,6 @@ static int nl80211_nan_add_func(struct sk_buff *skb,
 	if (!info->attrs[NL80211_ATTR_NAN_FUNC])
 		return -EINVAL;
 
-	if (wdev->owner_nlportid &&
-	    wdev->owner_nlportid != info->snd_portid)
-		return -ENOTCONN;
-
 	err = nla_parse_nested(tb, NL80211_NAN_FUNC_ATTR_MAX,
 			       info->attrs[NL80211_ATTR_NAN_FUNC],
 			       nl80211_nan_func_policy, info->extack);
@@ -11441,10 +11437,6 @@ static int nl80211_nan_del_func(struct sk_buff *skb,
 	if (!info->attrs[NL80211_ATTR_COOKIE])
 		return -EINVAL;
 
-	if (wdev->owner_nlportid &&
-	    wdev->owner_nlportid != info->snd_portid)
-		return -ENOTCONN;
-
 	cookie = nla_get_u64(info->attrs[NL80211_ATTR_COOKIE]);
 
 	rdev_del_nan_func(rdev, wdev, cookie);