mac80211_hwsim: Add minimal capability for vendor command/event testing

This allows wpa_supplicant/hostapd to send a vendor command and verify
response to that command and a vendor event.
Signed-off-by: Jouni Malinen <jouni@qca.qualcomm.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

drivers/net/wireless/mac80211_hwsim.c

@@ -330,6 +330,83 @@ static const struct ieee80211_rate hwsim_rates[] = {
 	{ .bitrate = 540 }
 };
 
+#define OUI_QCA 0x001374
+#define QCA_NL80211_SUBCMD_TEST 1
+enum qca_nl80211_vendor_subcmds {
+	QCA_WLAN_VENDOR_ATTR_TEST = 8,
+	QCA_WLAN_VENDOR_ATTR_MAX = QCA_WLAN_VENDOR_ATTR_TEST
+};
+
+static const struct nla_policy
+hwsim_vendor_test_policy[QCA_WLAN_VENDOR_ATTR_MAX + 1] = {
+	[QCA_WLAN_VENDOR_ATTR_MAX] = { .type = NLA_U32 },
+};
+
+static int mac80211_hwsim_vendor_cmd_test(struct wiphy *wiphy,
+					  struct wireless_dev *wdev,
+					  const void *data, int data_len)
+{
+	struct sk_buff *skb;
+	struct nlattr *tb[QCA_WLAN_VENDOR_ATTR_MAX + 1];
+	int err;
+	u32 val;
+
+	err = nla_parse(tb, QCA_WLAN_VENDOR_ATTR_MAX, data, data_len,
+			hwsim_vendor_test_policy);
+	if (err)
+		return err;
+	if (!tb[QCA_WLAN_VENDOR_ATTR_TEST])
+		return -EINVAL;
+	val = nla_get_u32(tb[QCA_WLAN_VENDOR_ATTR_TEST]);
+	wiphy_debug(wiphy, "%s: test=%u\n", __func__, val);
+
+	/* Send a vendor event as a test. Note that this would not normally be
+	 * done within a command handler, but rather, based on some other
+	 * trigger. For simplicity, this command is used to trigger the event
+	 * here.
+	 *
+	 * event_idx = 0 (index in mac80211_hwsim_vendor_commands)
+	 */
+	skb = cfg80211_vendor_event_alloc(wiphy, wdev, 100, 0, GFP_KERNEL);
+	if (skb) {
+		/* skb_put() or nla_put() will fill up data within
+		 * NL80211_ATTR_VENDOR_DATA.
+		 */
+
+		/* Add vendor data */
+		nla_put_u32(skb, QCA_WLAN_VENDOR_ATTR_TEST, val + 1);
+
+		/* Send the event - this will call nla_nest_end() */
+		cfg80211_vendor_event(skb, GFP_KERNEL);
+	}
+
+	/* Send a response to the command */
+	skb = cfg80211_vendor_cmd_alloc_reply_skb(wiphy, 10);
+	if (!skb)
+		return -ENOMEM;
+
+	/* skb_put() or nla_put() will fill up data within
+	 * NL80211_ATTR_VENDOR_DATA
+	 */
+	nla_put_u32(skb, QCA_WLAN_VENDOR_ATTR_TEST, val + 2);
+
+	return cfg80211_vendor_cmd_reply(skb);
+}
+
+static struct wiphy_vendor_command mac80211_hwsim_vendor_commands[] = {
+	{
+		.info = { .vendor_id = OUI_QCA,
+			  .subcmd = QCA_NL80211_SUBCMD_TEST },
+		.flags = WIPHY_VENDOR_CMD_NEED_NETDEV,
+		.doit = mac80211_hwsim_vendor_cmd_test,
+	}
+};
+
+/* Advertise support vendor specific events */
+static const struct nl80211_vendor_cmd_info mac80211_hwsim_vendor_events[] = {
+	{ .vendor_id = OUI_QCA, .subcmd = 1 },
+};
+
 static const struct ieee80211_iface_limit hwsim_if_limits[] = {
 	{ .max = 1, .types = BIT(NL80211_IFTYPE_ADHOC) },
 	{ .max = 2048,  .types = BIT(NL80211_IFTYPE_STATION) |
@@ -2416,6 +2493,12 @@ static int mac80211_hwsim_new_radio(struct genl_info *info,
 	hw->max_rates = 4;
 	hw->max_rate_tries = 11;
 
+	hw->wiphy->vendor_commands = mac80211_hwsim_vendor_commands;
+	hw->wiphy->n_vendor_commands =
+		ARRAY_SIZE(mac80211_hwsim_vendor_commands);
+	hw->wiphy->vendor_events = mac80211_hwsim_vendor_events;
+	hw->wiphy->n_vendor_events = ARRAY_SIZE(mac80211_hwsim_vendor_events);
+
 	if (param->reg_strict)
 		hw->wiphy->regulatory_flags |= REGULATORY_STRICT_REG;
 	if (param->regd) {