cfg80211: Provide an API to report NAN function termination

Provide a function that reports NAN DE function termination. The function
may be terminated due to one of the following reasons: user request,
ttl expiration or failure.
If the NAN instance is tied to the owner, the notification will be
sent to the socket that started the NAN interface only

Signed-off-by: Andrei Otcheretianski <andrei.otcheretianski@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index 5481664..fe78f02 100644 (file)
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -5731,6 +5731,22 @@ struct cfg80211_nan_match_params {
 void cfg80211_nan_match(struct wireless_dev *wdev,
                        struct cfg80211_nan_match_params *match, gfp_t gfp);
 
+/**
+ * cfg80211_nan_func_terminated - notify about NAN function termination.
+ *
+ * @wdev: the wireless device reporting the match
+ * @inst_id: the local instance id
+ * @reason: termination reason (one of the NL80211_NAN_FUNC_TERM_REASON_*)
+ * @cookie: unique NAN function identifier
+ * @gfp: allocation flags
+ *
+ * This function reports that the a NAN function is terminated.
+ */
+void cfg80211_nan_func_terminated(struct wireless_dev *wdev,
+                                 u8 inst_id,
+                                 enum nl80211_nan_func_term_reason reason,
+                                 u64 cookie, gfp_t gfp);
+
 /* ethtool helper */
 void cfg80211_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info);
 

diff --git a/include/uapi/linux/nl80211.h b/include/uapi/linux/nl80211.h
index 995bf80..56368e9 100644 (file)
--- a/include/uapi/linux/nl80211.h
+++ b/include/uapi/linux/nl80211.h
@@ -863,6 +863,9 @@
  *     the response to this command.
  *     Look at %NL80211_ATTR_SOCKET_OWNER as well.
  * @NL80211_CMD_DEL_NAN_FUNCTION: Delete a NAN function by cookie.
+ *     This command is also used as a notification sent when a NAN function is
+ *     terminated. This will contain a %NL80211_ATTR_NAN_FUNC_INST_ID
+ *     and %NL80211_ATTR_COOKIE attributes.
  * @NL80211_CMD_CHANGE_NAN_CONFIG: Change current NAN configuration. NAN
  *     must be operational (%NL80211_CMD_START_NAN was executed).
  *     It must contain at least one of the following attributes:
@@ -4985,6 +4988,21 @@ enum nl80211_nan_publish_type {
        NL80211_NAN_UNSOLICITED_PUBLISH = 1 << 1,
 };
 
+/**
+ * enum nl80211_nan_func_term_reason - NAN functions termination reason
+ *
+ * Defines termination reasons of a NAN function
+ *
+ * @NL80211_NAN_FUNC_TERM_REASON_USER_REQUEST: requested by user
+ * @NL80211_NAN_FUNC_TERM_REASON_TTL_EXPIRED: timeout
+ * @NL80211_NAN_FUNC_TERM_REASON_ERROR: errored
+ */
+enum nl80211_nan_func_term_reason {
+       NL80211_NAN_FUNC_TERM_REASON_USER_REQUEST,
+       NL80211_NAN_FUNC_TERM_REASON_TTL_EXPIRED,
+       NL80211_NAN_FUNC_TERM_REASON_ERROR,
+};
+
 #define NL80211_NAN_FUNC_SERVICE_ID_LEN 6
 #define NL80211_NAN_FUNC_SERVICE_SPEC_INFO_MAX_LEN 0xff
 #define NL80211_NAN_FUNC_SRF_MAX_LEN 0xff

diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index 0bbd9ed..92eb6f0 100644 (file)
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -11033,6 +11033,66 @@ nla_put_failure:
 }
 EXPORT_SYMBOL(cfg80211_nan_match);
 
+void cfg80211_nan_func_terminated(struct wireless_dev *wdev,
+                                 u8 inst_id,
+                                 enum nl80211_nan_func_term_reason reason,
+                                 u64 cookie, gfp_t gfp)
+{
+       struct wiphy *wiphy = wdev->wiphy;
+       struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
+       struct sk_buff *msg;
+       struct nlattr *func_attr;
+       void *hdr;
+
+       if (WARN_ON(!inst_id))
+               return;
+
+       msg = nlmsg_new(NLMSG_DEFAULT_SIZE, gfp);
+       if (!msg)
+               return;
+
+       hdr = nl80211hdr_put(msg, 0, 0, 0, NL80211_CMD_DEL_NAN_FUNCTION);
+       if (!hdr) {
+               nlmsg_free(msg);
+               return;
+       }
+
+       if (nla_put_u32(msg, NL80211_ATTR_WIPHY, rdev->wiphy_idx) ||
+           (wdev->netdev && nla_put_u32(msg, NL80211_ATTR_IFINDEX,
+                                        wdev->netdev->ifindex)) ||
+           nla_put_u64_64bit(msg, NL80211_ATTR_WDEV, wdev_id(wdev),
+                             NL80211_ATTR_PAD))
+               goto nla_put_failure;
+
+       if (nla_put_u64_64bit(msg, NL80211_ATTR_COOKIE, cookie,
+                             NL80211_ATTR_PAD))
+               goto nla_put_failure;
+
+       func_attr = nla_nest_start(msg, NL80211_ATTR_NAN_FUNC);
+       if (!func_attr)
+               goto nla_put_failure;
+
+       if (nla_put_u8(msg, NL80211_NAN_FUNC_INSTANCE_ID, inst_id) ||
+           nla_put_u8(msg, NL80211_NAN_FUNC_TERM_REASON, reason))
+               goto nla_put_failure;
+
+       nla_nest_end(msg, func_attr);
+       genlmsg_end(msg, hdr);
+
+       if (!wdev->owner_nlportid)
+               genlmsg_multicast_netns(&nl80211_fam, wiphy_net(&rdev->wiphy),
+                                       msg, 0, NL80211_MCGRP_NAN, gfp);
+       else
+               genlmsg_unicast(wiphy_net(&rdev->wiphy), msg,
+                               wdev->owner_nlportid);
+
+       return;
+
+nla_put_failure:
+       nlmsg_free(msg);
+}
+EXPORT_SYMBOL(cfg80211_nan_func_terminated);
+
 static int nl80211_get_protocol_features(struct sk_buff *skb,
                                         struct genl_info *info)
 {