From 55c1fdf0d6c57e02c2279e0ba0c6f8ec502b46df Mon Sep 17 00:00:00 2001 From: Johannes Berg Date: Wed, 6 Feb 2019 13:17:19 +0200 Subject: cfg80211: allow sending vendor events unicast Sometimes, we may want to transport higher bandwidth data through vendor events, and in that case sending it multicast is a bad idea. Allow vendor events to be unicast. Signed-off-by: Johannes Berg --- include/net/cfg80211.h | 49 +++++++++++++++++++++++++++++++++++++++++++++++-- 1 file changed, 47 insertions(+), 2 deletions(-) (limited to 'include/net') diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h index 7a29b709077f..bb307a11ee63 100644 --- a/include/net/cfg80211.h +++ b/include/net/cfg80211.h @@ -5854,6 +5854,7 @@ struct sk_buff *__cfg80211_alloc_event_skb(struct wiphy *wiphy, struct wireless_dev *wdev, enum nl80211_commands cmd, enum nl80211_attrs attr, + unsigned int portid, int vendor_event_idx, int approxlen, gfp_t gfp); @@ -5903,6 +5904,15 @@ cfg80211_vendor_cmd_alloc_reply_skb(struct wiphy *wiphy, int approxlen) */ int cfg80211_vendor_cmd_reply(struct sk_buff *skb); +/** + * cfg80211_vendor_cmd_get_sender + * @wiphy: the wiphy + * + * Return the current netlink port ID in a vendor command handler. + * Valid to call only there. + */ +unsigned int cfg80211_vendor_cmd_get_sender(struct wiphy *wiphy); + /** * cfg80211_vendor_event_alloc - allocate vendor-specific event skb * @wiphy: the wiphy @@ -5930,7 +5940,42 @@ cfg80211_vendor_event_alloc(struct wiphy *wiphy, struct wireless_dev *wdev, { return __cfg80211_alloc_event_skb(wiphy, wdev, NL80211_CMD_VENDOR, NL80211_ATTR_VENDOR_DATA, - event_idx, approxlen, gfp); + 0, event_idx, approxlen, gfp); +} + +/** + * cfg80211_vendor_event_alloc_ucast - alloc unicast vendor-specific event skb + * @wiphy: the wiphy + * @wdev: the wireless device + * @event_idx: index of the vendor event in the wiphy's vendor_events + * @portid: port ID of the receiver + * @approxlen: an upper bound of the length of the data that will + * be put into the skb + * @gfp: allocation flags + * + * This function allocates and pre-fills an skb for an event to send to + * a specific (userland) socket. This socket would previously have been + * obtained by cfg80211_vendor_cmd_get_sender(), and the caller MUST take + * care to register a netlink notifier to see when the socket closes. + * + * If wdev != NULL, both the ifindex and identifier of the specified + * wireless device are added to the event message before the vendor data + * attribute. + * + * When done filling the skb, call cfg80211_vendor_event() with the + * skb to send the event. + * + * Return: An allocated and pre-filled skb. %NULL if any errors happen. + */ +static inline struct sk_buff * +cfg80211_vendor_event_alloc_ucast(struct wiphy *wiphy, + struct wireless_dev *wdev, + unsigned int portid, int approxlen, + int event_idx, gfp_t gfp) +{ + return __cfg80211_alloc_event_skb(wiphy, wdev, NL80211_CMD_VENDOR, + NL80211_ATTR_VENDOR_DATA, + portid, event_idx, approxlen, gfp); } /** @@ -6030,7 +6075,7 @@ static inline struct sk_buff * cfg80211_testmode_alloc_event_skb(struct wiphy *wiphy, int approxlen, gfp_t gfp) { return __cfg80211_alloc_event_skb(wiphy, NULL, NL80211_CMD_TESTMODE, - NL80211_ATTR_TESTDATA, -1, + NL80211_ATTR_TESTDATA, 0, -1, approxlen, gfp); } -- cgit v1.2.3