nl80211: vendor command support
Add support for vendor-specific commands to nl80211. This is
intended to be used for really vendor-specific functionality
that can't be implemented in a generic fashion for any reason.
It's *NOT* intended to be used for any normal/generic feature
or any optimisations that could be implemented across drivers.
Currently, only vendor commands (with replies) are supported,
no dump operations or vendor-specific notifications.
Also add a function wdev_to_ieee80211_vif() to mac80211 which
is needed for mac80211-based drivers wanting to implement any
vendor commands.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index 47290a4..884ac69 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -2680,6 +2680,34 @@
};
/**
+ * enum wiphy_vendor_command_flags - validation flags for vendor commands
+ * @WIPHY_VENDOR_CMD_NEED_WDEV: vendor command requires wdev
+ * @WIPHY_VENDOR_CMD_NEED_NETDEV: vendor command requires netdev
+ * @WIPHY_VENDOR_CMD_NEED_RUNNING: interface/wdev must be up & running
+ * (must be combined with %_WDEV or %_NETDEV)
+ */
+enum wiphy_vendor_command_flags {
+ WIPHY_VENDOR_CMD_NEED_WDEV = BIT(0),
+ WIPHY_VENDOR_CMD_NEED_NETDEV = BIT(1),
+ WIPHY_VENDOR_CMD_NEED_RUNNING = BIT(2),
+};
+
+/**
+ * struct wiphy_vendor_command - vendor command definition
+ * @info: vendor command identifying information, as used in nl80211
+ * @flags: flags, see &enum wiphy_vendor_command_flags
+ * @doit: callback for the operation, note that wdev is %NULL if the
+ * flags didn't ask for a wdev and non-%NULL otherwise; the data
+ * pointer may be %NULL if userspace provided no data at all
+ */
+struct wiphy_vendor_command {
+ struct nl80211_vendor_cmd_info info;
+ u32 flags;
+ int (*doit)(struct wiphy *wiphy, struct wireless_dev *wdev,
+ const void *data, int data_len);
+};
+
+/**
* struct wiphy - wireless hardware description
* @reg_notifier: the driver's regulatory notification callback,
* note that if your driver uses wiphy_apply_custom_regulatory()
@@ -2792,6 +2820,9 @@
* @extended_capabilities_mask: mask of the valid values
* @extended_capabilities_len: length of the extended capabilities
* @coalesce: packet coalescing support information
+ *
+ * @vendor_commands: array of vendor commands supported by the hardware
+ * @n_vendor_commands: number of vendor commands
*/
struct wiphy {
/* assign these fields before you register the wiphy */
@@ -2903,6 +2934,9 @@
const struct wiphy_coalesce_support *coalesce;
+ const struct wiphy_vendor_command *vendor_commands;
+ int n_vendor_commands;
+
char priv[0] __aligned(NETDEV_ALIGN);
};
@@ -3847,6 +3881,75 @@
*/
void wiphy_rfkill_stop_polling(struct wiphy *wiphy);
+/**
+ * DOC: Vendor commands
+ *
+ * Occasionally, there are special protocol or firmware features that
+ * can't be implemented very openly. For this and similar cases, the
+ * vendor command functionality allows implementing the features with
+ * (typically closed-source) userspace and firmware, using nl80211 as
+ * the configuration mechanism.
+ *
+ * A driver supporting vendor commands must register them as an array
+ * in struct wiphy, with handlers for each one, each command has an
+ * OUI and sub command ID to identify it.
+ *
+ * Note that this feature should not be (ab)used to implement protocol
+ * features that could openly be shared across drivers. In particular,
+ * it must never be required to use vendor commands to implement any
+ * "normal" functionality that higher-level userspace like connection
+ * managers etc. need.
+ */
+
+struct sk_buff *__cfg80211_alloc_reply_skb(struct wiphy *wiphy,
+ enum nl80211_commands cmd,
+ enum nl80211_attrs attr,
+ int approxlen);
+
+/**
+ * cfg80211_vendor_cmd_alloc_reply_skb - allocate vendor command reply
+ * @wiphy: the wiphy
+ * @approxlen: an upper bound of the length of the data that will
+ * be put into the skb
+ *
+ * This function allocates and pre-fills an skb for a reply to
+ * a vendor command. Since it is intended for a reply, calling
+ * it outside of a vendor command's doit() operation is invalid.
+ *
+ * The returned skb is pre-filled with some identifying data in
+ * a way that any data that is put into the skb (with skb_put(),
+ * nla_put() or similar) will end up being within the
+ * %NL80211_ATTR_VENDOR_DATA attribute, so all that needs to be done
+ * with the skb is adding data for the corresponding userspace tool
+ * which can then read that data out of the vendor data attribute.
+ * You must not modify the skb in any other way.
+ *
+ * When done, call cfg80211_vendor_cmd_reply() with the skb and return
+ * its error code as the result of the doit() operation.
+ *
+ * Return: An allocated and pre-filled skb. %NULL if any errors happen.
+ */
+static inline struct sk_buff *
+cfg80211_vendor_cmd_alloc_reply_skb(struct wiphy *wiphy, int approxlen)
+{
+ return __cfg80211_alloc_reply_skb(wiphy, NL80211_CMD_VENDOR,
+ NL80211_ATTR_VENDOR_DATA, approxlen);
+}
+
+/**
+ * cfg80211_vendor_cmd_reply - send the reply skb
+ * @skb: The skb, must have been allocated with
+ * cfg80211_vendor_cmd_alloc_reply_skb()
+ *
+ * Since calling this function will usually be the last thing
+ * before returning from the vendor command doit() you should
+ * return the error code. Note that this function consumes the
+ * skb regardless of the return value.
+ *
+ * Return: An error code or 0 on success.
+ */
+int cfg80211_vendor_cmd_reply(struct sk_buff *skb);
+
#ifdef CONFIG_NL80211_TESTMODE
/**
* DOC: Test mode
@@ -3882,8 +3985,12 @@
*
* Return: An allocated and pre-filled skb. %NULL if any errors happen.
*/
-struct sk_buff *cfg80211_testmode_alloc_reply_skb(struct wiphy *wiphy,
- int approxlen);
+static inline struct sk_buff *
+cfg80211_testmode_alloc_reply_skb(struct wiphy *wiphy, int approxlen)
+{
+ return __cfg80211_alloc_reply_skb(wiphy, NL80211_CMD_TESTMODE,
+ NL80211_ATTR_TESTDATA, approxlen);
+}
/**
* cfg80211_testmode_reply - send the reply skb
@@ -3897,7 +4004,10 @@
*
* Return: An error code or 0 on success.
*/
-int cfg80211_testmode_reply(struct sk_buff *skb);
+static inline int cfg80211_testmode_reply(struct sk_buff *skb)
+{
+ return cfg80211_vendor_cmd_reply(skb);
+}
/**
* cfg80211_testmode_alloc_event_skb - allocate testmode event