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authorAndrei Otcheretianski <andrei.otcheretianski@intel.com>2017-06-26 19:52:30 +0300
committerKalle Valo <kvalo@codeaurora.org>2017-06-30 09:44:17 +0300
commit36a554cec119bbd20c4ec0cb96bd4712d124bfea (patch)
tree44c5e2f4e4dcb862ede0d6974c3d6bc7e5c134bb
parent123fef3fd4ae6052bad5cf1623c49845d16a6c67 (diff)
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>
-rw-r--r--include/uapi/linux/nl80211.h9
-rw-r--r--net/wireless/nl80211.c8
2 files changed, 4 insertions, 13 deletions
diff --git a/include/uapi/linux/nl80211.h b/include/uapi/linux/nl80211.h
index 828aa4703e22..51626b4175c0 100644
--- a/include/uapi/linux/nl80211.h
+++ b/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.
*
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index 5487cd775b6f..45ba3d0872cc 100644
--- a/net/wireless/nl80211.c
+++ b/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);