[PATCH 4/4] hostapd: add support for pre-auth rx over driver event

[Markus Theil <markus.theil@xxxxxxxxxxxxx>]

This patch enables hostapd to receive pre-auth frames over nl80211.

Signed-off-by: Markus Theil <markus.theil@xxxxxxxxxxxxx>
---
 src/ap/drv_callbacks.c | 32 ++++++++++++++++++++++++++++++++
 src/ap/preauth_auth.c  | 29 +++++++++++++++++++++++++++++
 src/ap/preauth_auth.h  | 13 +++++++++++++
 3 files changed, 74 insertions(+)

diff --git a/src/ap/drv_callbacks.c b/src/ap/drv_callbacks.c
index fdd845573..4c0ea80c4 100644
--- a/src/ap/drv_callbacks.c
+++ b/src/ap/drv_callbacks.c
@@ -42,6 +42,7 @@
 #include "dpp_hostapd.h"
 #include "fils_hlp.h"
 #include "neighbor_db.h"
+#include "preauth_auth.h"
 
 
 #ifdef CONFIG_FILS
@@ -1424,6 +1425,30 @@ static void hostapd_event_eapol_rx(struct hostapd_data *hapd, const u8 *src,
 	ieee802_1x_receive(hapd, src, data, data_len);
 }
 
+
+static void hostapd_event_rsn_preauth_rx(struct hostapd_data *hapd,
+					 const u8 *src, const u8 *dst,
+					 const u8 *data, size_t data_len)
+{
+	if (!hapd->preauth_iface) {
+		wpa_printf(MSG_DEBUG, "Received pre-auth frame from " MACSTR
+			   " without preauth_iface created",
+			   MAC2STR(src));
+		return;
+	}
+
+	if (!dst) {
+		wpa_printf(MSG_DEBUG, "Received pre-auth frame from " MACSTR
+			   " without destination MAC set, maybe your kernel "
+			   "is too old for nl80211 control port rx",
+			   MAC2STR(src));
+		return;
+	}
+
+	rsn_preauth_receive_or_forward(hapd, src, dst, data, data_len);
+}
+
+
 #endif /* HOSTAPD */
 
 
@@ -1797,6 +1822,13 @@ void wpa_supplicant_event(void *ctx, enum wpa_event_type event,
 				       data->eapol_rx.data,
 				       data->eapol_rx.data_len);
 		break;
+	case EVENT_RSN_PREAUTH_RX:
+		hostapd_event_rsn_preauth_rx(hapd,
+					     data->rsn_preauth_rx.src,
+					     data->rsn_preauth_rx.dst,
+					     data->rsn_preauth_rx.data,
+					     data->rsn_preauth_rx.data_len);
+		break;
 	case EVENT_ASSOC:
 		if (!data)
 			return;
diff --git a/src/ap/preauth_auth.c b/src/ap/preauth_auth.c
index 3e0c8000d..a367b5e19 100644
--- a/src/ap/preauth_auth.c
+++ b/src/ap/preauth_auth.c
@@ -270,4 +270,33 @@ void rsn_preauth_free_station(struct hostapd_data *hapd, struct sta_info *sta)
 	eloop_cancel_timeout(rsn_preauth_finished_cb, hapd, sta);
 }
 
+void rsn_preauth_receive_or_forward(struct hostapd_data *hapd,
+				    const u8 *src_addr,
+				    const u8 *dst_addr,
+				    const u8 *buf, size_t len)
+{
+	struct l2_ethhdr *ethhdr;
+
+	ethhdr = os_malloc(sizeof(*ethhdr) + len);
+	if (ethhdr == NULL)
+		return;
+
+	if (os_memcmp(dst_addr, hapd->own_addr, ETH_ALEN) != 0) {
+		os_memcpy(ethhdr->h_dest, dst_addr, ETH_ALEN);
+		os_memcpy(ethhdr->h_source, src_addr, ETH_ALEN);
+		ethhdr->h_proto = host_to_be16(ETH_P_PREAUTH);
+		os_memcpy(ethhdr + 1, buf, len);
+
+		if (l2_packet_send(hapd->preauth_iface->l2, dst_addr, ETH_P_PREAUTH, (u8 *) ethhdr,
+				   sizeof(*ethhdr) + len) < 0) {
+			wpa_printf(MSG_ERROR, "Failed to forward preauth packet using "
+				   "l2_packet_send\n");
+		}
+	} else {
+		rsn_preauth_receive(hapd->preauth_iface, src_addr, buf, len);
+	}
+
+	os_free(ethhdr);
+}
+
 #endif /* CONFIG_RSN_PREAUTH */
diff --git a/src/ap/preauth_auth.h b/src/ap/preauth_auth.h
index 69fb3566e..d6ae1b72d 100644
--- a/src/ap/preauth_auth.h
+++ b/src/ap/preauth_auth.h
@@ -19,6 +19,11 @@ void rsn_preauth_send(struct hostapd_data *hapd, struct sta_info *sta,
 		      u8 *buf, size_t len);
 void rsn_preauth_free_station(struct hostapd_data *hapd, struct sta_info *sta);
 
+void rsn_preauth_receive_or_forward(struct hostapd_data *hapd,
+				    const u8 *src_addr,
+				    const u8 *dst_addr,
+				    const u8 *buf, size_t len);
+
 #else /* CONFIG_RSN_PREAUTH */
 
 static inline int rsn_preauth_iface_init(struct hostapd_data *hapd)
@@ -47,6 +52,14 @@ static inline void rsn_preauth_free_station(struct hostapd_data *hapd,
 {
 }
 
+static inline void rsn_preauth_receive_or_forward(struct hostapd_data *hapd,
+						  const u8 *src_addr,
+						  const u8 *dst_addr,
+						  const u8 *buf, size_t len)
+{
+}
+
+
 #endif /* CONFIG_RSN_PREAUTH */
 
 #endif /* PREAUTH_H */
-- 
2.17.1


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