mka: Add support for removing SAs

So that the core can notify drivers that need to perform some operations
when an SA is deleted.

Signed-off-by: Sabrina Dubroca <sd@queasysnail.net>

src/drivers/driver.h

@@ -3418,6 +3418,14 @@ struct wpa_driver_ops {
 	 */
 	int (*create_receive_sa)(void *priv, struct receive_sa *sa);
 
+	/**
+	 * delete_receive_sa - Delete secure association for receive
+	 * @priv: Private driver interface data from init()
+	 * @sa: Secure association
+	 * Returns: 0 on success, -1 on failure
+	 */
+	int (*delete_receive_sa)(void *priv, struct receive_sa *sa);
+
 	/**
 	 * enable_receive_sa - enable the SA for receive
 	 * @priv: private driver interface data from init()
@@ -3460,6 +3468,14 @@ struct wpa_driver_ops {
 	 */
 	int (*create_transmit_sa)(void *priv, struct transmit_sa *sa);
 
+	/**
+	 * delete_transmit_sa - Delete secure association for transmit
+	 * @priv: Private driver interface data from init()
+	 * @sa: Secure association
+	 * Returns: 0 on success, -1 on failure
+	 */
+	int (*delete_transmit_sa)(void *priv, struct transmit_sa *sa);
+
 	/**
 	 * enable_transmit_sa - enable SA for transmit
 	 * @priv: private driver interface data from init()

src/pae/ieee802_1x_kay.c

@@ -491,6 +491,15 @@ ieee802_1x_kay_init_receive_sc(const struct ieee802_1x_mka_sci *psci)
 }
 
 
+static void ieee802_1x_delete_receive_sa(struct ieee802_1x_kay *kay,
+					 struct receive_sa *sa)
+{
+	secy_disable_receive_sa(kay, sa);
+	secy_delete_receive_sa(kay, sa);
+	ieee802_1x_kay_deinit_receive_sa(sa);
+}
+
+
 /**
  * ieee802_1x_kay_deinit_receive_sc -
  **/
@@ -502,10 +511,9 @@ ieee802_1x_kay_deinit_receive_sc(
 
 	wpa_printf(MSG_DEBUG, "KaY: Delete receive SC");
 	dl_list_for_each_safe(psa, pre_sa, &psc->sa_list, struct receive_sa,
-			      list)  {
-		secy_disable_receive_sa(participant->kay, psa);
-		ieee802_1x_kay_deinit_receive_sa(psa);
-	}
+			      list)
+		ieee802_1x_delete_receive_sa(participant->kay, psa);
+
 	dl_list_del(&psc->list);
 	os_free(psc);
 }
@@ -2270,6 +2278,16 @@ ieee802_1x_participant_send_mkpdu(
 
 
 static void ieee802_1x_kay_deinit_transmit_sa(struct transmit_sa *psa);
+
+static void ieee802_1x_delete_transmit_sa(struct ieee802_1x_kay *kay,
+					  struct transmit_sa *sa)
+{
+	secy_disable_transmit_sa(kay, sa);
+	secy_delete_transmit_sa(kay, sa);
+	ieee802_1x_kay_deinit_transmit_sa(sa);
+}
+
+
 /**
  * ieee802_1x_participant_timer -
  */
@@ -2344,8 +2362,7 @@ static void ieee802_1x_participant_timer(void *eloop_ctx, void *timeout_ctx)
 			dl_list_for_each_safe(txsa, pre_txsa,
 					      &participant->txsc->sa_list,
 					      struct transmit_sa, list) {
-				secy_disable_transmit_sa(kay, txsa);
-				ieee802_1x_kay_deinit_transmit_sa(txsa);
+				ieee802_1x_delete_transmit_sa(kay, txsa);
 			}
 
 			ieee802_1x_cp_connect_authenticated(kay->cp);
@@ -2487,11 +2504,8 @@ ieee802_1x_kay_deinit_transmit_sc(
 	struct transmit_sa *psa, *tmp;
 
 	wpa_printf(MSG_DEBUG, "KaY: Delete transmit SC");
-	dl_list_for_each_safe(psa, tmp, &psc->sa_list, struct transmit_sa,
-			      list) {
-		secy_disable_transmit_sa(participant->kay, psa);
-		ieee802_1x_kay_deinit_transmit_sa(psa);
-	}
+	dl_list_for_each_safe(psa, tmp, &psc->sa_list, struct transmit_sa, list)
+		ieee802_1x_delete_transmit_sa(participant->kay, psa);
 
 	os_free(psc);
 }
@@ -2569,6 +2583,32 @@ int ieee802_1x_kay_set_old_sa_attr(struct ieee802_1x_kay *kay,
 }
 
 
+static struct transmit_sa * lookup_txsa_by_an(struct transmit_sc *txsc, u8 an)
+{
+	struct transmit_sa *txsa;
+
+	dl_list_for_each(txsa, &txsc->sa_list, struct transmit_sa, list) {
+		if (txsa->an == an)
+			return txsa;
+	}
+
+	return NULL;
+}
+
+
+static struct receive_sa * lookup_rxsa_by_an(struct receive_sc *rxsc, u8 an)
+{
+	struct receive_sa *rxsa;
+
+	dl_list_for_each(rxsa, &rxsc->sa_list, struct receive_sa, list) {
+		if (rxsa->an == an)
+			return rxsa;
+	}
+
+	return NULL;
+}
+
+
 /**
  * ieee802_1x_kay_create_sas -
  */
@@ -2603,6 +2643,9 @@ int ieee802_1x_kay_create_sas(struct ieee802_1x_kay *kay,
 	}
 
 	dl_list_for_each(rxsc, &principal->rxsc_list, struct receive_sc, list) {
+		while ((rxsa = lookup_rxsa_by_an(rxsc, latest_sak->an)) != NULL)
+			ieee802_1x_delete_receive_sa(kay, rxsa);
+
 		rxsa = ieee802_1x_kay_init_receive_sa(rxsc, latest_sak->an, 1,
 						      latest_sak);
 		if (!rxsa)
@@ -2611,6 +2654,10 @@ int ieee802_1x_kay_create_sas(struct ieee802_1x_kay *kay,
 		secy_create_receive_sa(kay, rxsa);
 	}
 
+	while ((txsa = lookup_txsa_by_an(principal->txsc, latest_sak->an)) !=
+	       NULL)
+		ieee802_1x_delete_transmit_sa(kay, txsa);
+
 	txsa = ieee802_1x_kay_init_transmit_sa(principal->txsc, latest_sak->an,
 					       1, latest_sak);
 	if (!txsa)
@@ -2644,20 +2691,16 @@ int ieee802_1x_kay_delete_sas(struct ieee802_1x_kay *kay,
 	/* remove the transmit sa */
 	dl_list_for_each_safe(txsa, pre_txsa, &principal->txsc->sa_list,
 			      struct transmit_sa, list) {
-		if (is_ki_equal(&txsa->pkey->key_identifier, ki)) {
-			secy_disable_transmit_sa(kay, txsa);
-			ieee802_1x_kay_deinit_transmit_sa(txsa);
-		}
+		if (is_ki_equal(&txsa->pkey->key_identifier, ki))
+			ieee802_1x_delete_transmit_sa(kay, txsa);
 	}
 
 	/* remove the receive sa */
 	dl_list_for_each(rxsc, &principal->rxsc_list, struct receive_sc, list) {
 		dl_list_for_each_safe(rxsa, pre_rxsa, &rxsc->sa_list,
 				      struct receive_sa, list) {
-			if (is_ki_equal(&rxsa->pkey->key_identifier, ki)) {
-				secy_disable_receive_sa(kay, rxsa);
-				ieee802_1x_kay_deinit_receive_sa(rxsa);
-			}
+			if (is_ki_equal(&rxsa->pkey->key_identifier, ki))
+				ieee802_1x_delete_receive_sa(kay, rxsa);
 		}
 	}
 

src/pae/ieee802_1x_kay.h

@@ -153,12 +153,14 @@ struct ieee802_1x_kay_ctx {
 				 enum confidentiality_offset co);
 	int (*delete_receive_sc)(void *ctx, struct receive_sc *sc);
 	int (*create_receive_sa)(void *ctx, struct receive_sa *sa);
+	int (*delete_receive_sa)(void *ctx, struct receive_sa *sa);
 	int (*enable_receive_sa)(void *ctx, struct receive_sa *sa);
 	int (*disable_receive_sa)(void *ctx, struct receive_sa *sa);
 	int (*create_transmit_sc)(void *ctx, struct transmit_sc *sc,
 				  enum confidentiality_offset co);
 	int (*delete_transmit_sc)(void *ctx, struct transmit_sc *sc);
 	int (*create_transmit_sa)(void *ctx, struct transmit_sa *sa);
+	int (*delete_transmit_sa)(void *ctx, struct transmit_sa *sa);
 	int (*enable_transmit_sa)(void *ctx, struct transmit_sa *sa);
 	int (*disable_transmit_sa)(void *ctx, struct transmit_sa *sa);
 };

src/pae/ieee802_1x_secy_ops.c

@@ -256,6 +256,26 @@ int secy_create_receive_sa(struct ieee802_1x_kay *kay, struct receive_sa *rxsa)
 }
 
 
+int secy_delete_receive_sa(struct ieee802_1x_kay *kay, struct receive_sa *rxsa)
+{
+	struct ieee802_1x_kay_ctx *ops;
+
+	if (!kay || !rxsa) {
+		wpa_printf(MSG_ERROR, "KaY: %s params invalid", __func__);
+		return -1;
+	}
+
+	ops = kay->ctx;
+	if (!ops || !ops->delete_receive_sa) {
+		wpa_printf(MSG_ERROR,
+			   "KaY: secy delete_receive_sa operation not supported");
+		return -1;
+	}
+
+	return ops->delete_receive_sa(ops->ctx, rxsa);
+}
+
+
 int secy_enable_receive_sa(struct ieee802_1x_kay *kay, struct receive_sa *rxsa)
 {
 	struct ieee802_1x_kay_ctx *ops;
@@ -363,6 +383,27 @@ int secy_create_transmit_sa(struct ieee802_1x_kay *kay,
 }
 
 
+int secy_delete_transmit_sa(struct ieee802_1x_kay *kay,
+			    struct transmit_sa *txsa)
+{
+	struct ieee802_1x_kay_ctx *ops;
+
+	if (!kay || !txsa) {
+		wpa_printf(MSG_ERROR, "KaY: %s params invalid", __func__);
+		return -1;
+	}
+
+	ops = kay->ctx;
+	if (!ops || !ops->delete_transmit_sa) {
+		wpa_printf(MSG_ERROR,
+			   "KaY: secy delete_transmit_sa operation not supported");
+		return -1;
+	}
+
+	return ops->delete_transmit_sa(ops->ctx, txsa);
+}
+
+
 int secy_enable_transmit_sa(struct ieee802_1x_kay *kay,
 			    struct transmit_sa *txsa)
 {

src/pae/ieee802_1x_secy_ops.h

@@ -38,6 +38,7 @@ int secy_set_transmit_next_pn(struct ieee802_1x_kay *kay,
 int secy_create_receive_sc(struct ieee802_1x_kay *kay, struct receive_sc *rxsc);
 int secy_delete_receive_sc(struct ieee802_1x_kay *kay, struct receive_sc *rxsc);
 int secy_create_receive_sa(struct ieee802_1x_kay *kay, struct receive_sa *rxsa);
+int secy_delete_receive_sa(struct ieee802_1x_kay *kay, struct receive_sa *rxsa);
 int secy_enable_receive_sa(struct ieee802_1x_kay *kay, struct receive_sa *rxsa);
 int secy_disable_receive_sa(struct ieee802_1x_kay *kay,
 			    struct receive_sa *rxsa);
@@ -48,6 +49,8 @@ int secy_delete_transmit_sc(struct ieee802_1x_kay *kay,
 			    struct transmit_sc *txsc);
 int secy_create_transmit_sa(struct ieee802_1x_kay *kay,
 			    struct transmit_sa *txsa);
+int secy_delete_transmit_sa(struct ieee802_1x_kay *kay,
+			    struct transmit_sa *txsa);
 int secy_enable_transmit_sa(struct ieee802_1x_kay *kay,
 			    struct transmit_sa *txsa);
 int secy_disable_transmit_sa(struct ieee802_1x_kay *kay,

wpa_supplicant/driver_i.h

@@ -806,6 +806,14 @@ static inline int wpa_drv_create_receive_sa(struct wpa_supplicant *wpa_s,
 	return wpa_s->driver->create_receive_sa(wpa_s->drv_priv, sa);
 }
 
+static inline int wpa_drv_delete_receive_sa(struct wpa_supplicant *wpa_s,
+					    struct receive_sa *sa)
+{
+	if (!wpa_s->driver->delete_receive_sa)
+		return -1;
+	return wpa_s->driver->delete_receive_sa(wpa_s->drv_priv, sa);
+}
+
 static inline int wpa_drv_enable_receive_sa(struct wpa_supplicant *wpa_s,
 					    struct receive_sa *sa)
 {
@@ -848,6 +856,14 @@ static inline int wpa_drv_create_transmit_sa(struct wpa_supplicant *wpa_s,
 	return wpa_s->driver->create_transmit_sa(wpa_s->drv_priv, sa);
 }
 
+static inline int wpa_drv_delete_transmit_sa(struct wpa_supplicant *wpa_s,
+					     struct transmit_sa *sa)
+{
+	if (!wpa_s->driver->delete_transmit_sa)
+		return -1;
+	return wpa_s->driver->delete_transmit_sa(wpa_s->drv_priv, sa);
+}
+
 static inline int wpa_drv_enable_transmit_sa(struct wpa_supplicant *wpa_s,
 					     struct transmit_sa *sa)
 {

wpa_supplicant/wpas_kay.c

@@ -120,6 +120,12 @@ static int wpas_create_receive_sa(void *wpa_s, struct receive_sa *sa)
 }
 
 
+static int wpas_delete_receive_sa(void *wpa_s, struct receive_sa *sa)
+{
+	return wpa_drv_delete_receive_sa(wpa_s, sa);
+}
+
+
 static int wpas_enable_receive_sa(void *wpa_s, struct receive_sa *sa)
 {
 	return wpa_drv_enable_receive_sa(wpa_s, sa);
@@ -152,6 +158,12 @@ static int wpas_create_transmit_sa(void *wpa_s, struct transmit_sa *sa)
 }
 
 
+static int wpas_delete_transmit_sa(void *wpa_s, struct transmit_sa *sa)
+{
+	return wpa_drv_delete_transmit_sa(wpa_s, sa);
+}
+
+
 static int wpas_enable_transmit_sa(void *wpa_s, struct transmit_sa *sa)
 {
 	return wpa_drv_enable_transmit_sa(wpa_s, sa);
@@ -196,11 +208,13 @@ int ieee802_1x_alloc_kay_sm(struct wpa_supplicant *wpa_s, struct wpa_ssid *ssid)
 	kay_ctx->create_receive_sc = wpas_create_receive_sc;
 	kay_ctx->delete_receive_sc = wpas_delete_receive_sc;
 	kay_ctx->create_receive_sa = wpas_create_receive_sa;
+	kay_ctx->delete_receive_sa = wpas_delete_receive_sa;
 	kay_ctx->enable_receive_sa = wpas_enable_receive_sa;
 	kay_ctx->disable_receive_sa = wpas_disable_receive_sa;
 	kay_ctx->create_transmit_sc = wpas_create_transmit_sc;
 	kay_ctx->delete_transmit_sc = wpas_delete_transmit_sc;
 	kay_ctx->create_transmit_sa = wpas_create_transmit_sa;
+	kay_ctx->delete_transmit_sa = wpas_delete_transmit_sa;
 	kay_ctx->enable_transmit_sa = wpas_enable_transmit_sa;
 	kay_ctx->disable_transmit_sa = wpas_disable_transmit_sa;