drivers: wifi: nrfwifi: Promiscuous mode filtering support in driver

This set of changes brings in promiscuous mode filtering support in
driver. Since, firmware would be unable to filter packets due to
connection issues, the filtering support for promiscuous mode is
moved to the driver.

Signed-off-by: Vivekananda Uppunda <[email protected]>

Author: VivekUppunda

drivers/wifi/nrfwifi/src/fmac_main.c

@@ -715,7 +715,7 @@ static int nrf_wifi_drv_main_zep(const struct device *dev)
 	callbk_fns.if_carr_state_chg_callbk_fn = nrf_wifi_if_carr_state_chg;
 	callbk_fns.rx_frm_callbk_fn = nrf_wifi_if_rx_frm;
 #if defined(CONFIG_NRF70_RAW_DATA_RX) || defined(CONFIG_NRF70_PROMISC_DATA_RX)
-	callbk_fns.rx_sniffer_frm_callbk_fn = nrf_wifi_if_sniffer_rx_frm;
+	callbk_fns.sniffer_callbk_fn = nrf_wifi_if_sniffer_rx_frm;
 #endif /* CONFIG_NRF70_RAW_DATA_RX || CONFIG_NRF70_PROMISC_DATA_RX */
 #endif
 	rx_buf_pools[0].num_bufs = rx1_num_bufs;

drivers/wifi/nrfwifi/src/wifi_mgmt.c

@@ -935,6 +935,21 @@ int nrf_wifi_filter(const struct device *dev,
 	def_dev_ctx = wifi_dev_priv(fmac_dev_ctx);
 
 	if (filter->oper == WIFI_MGMT_SET) {
+		/**
+		 * If promiscuous mode is enabled, filter settings
+		 * cannot be plumbed to the lower layers as that might
+		 * affect connectivity. Save the filter settings in the
+		 * driver and filter packet type on packet receive by
+		 * checking the 802.11 header in the packet
+		 */
+		if (((def_dev_ctx->vif_ctx[vif_ctx_zep->vif_idx]->mode) &
+		    (NRF_WIFI_PROMISCUOUS_MODE)) == NRF_WIFI_PROMISCUOUS_MODE) {
+			def_dev_ctx->vif_ctx[vif_ctx_zep->vif_idx]->packet_filter =
+				filter->filter;
+			ret = 0;
+			goto out;
+		}
+
 		/**
 		 * In case a user sets data + management + ctrl bits
 		 * or all the filter bits. Map it to bit 0 set to