Add PMKSA-CACHE-ADDED/REMOVED events to wpa_supplicant

These allow external program to monitor PMKSA cache updates in
preparation to enable external persistent storage of PMKSA cache.

Signed-off-by: Jouni Malinen <jouni@qca.qualcomm.com>

src/common/wpa_ctrl.h

@@ -288,6 +288,11 @@ extern "C" {
 /* BSS Transition Management Request received with MBO transition reason */
 #define MBO_TRANSITION_REASON "MBO-TRANSITION-REASON "
 
+/* PMKSA cache entry added; parameters: <BSSID> <network_id> */
+#define PMKSA_CACHE_ADDED "PMKSA-CACHE-ADDED "
+/* PMKSA cache entry removed; parameters: <BSSID> <network_id> */
+#define PMKSA_CACHE_REMOVED "PMKSA-CACHE-REMOVED "
+
 /* BSS command information masks */
 
 #define WPA_BSS_MASK_ALL		0xFFFDFFFF

src/rsn_supp/pmksa_cache.c

@@ -43,7 +43,8 @@ static void pmksa_cache_free_entry(struct rsn_pmksa_cache *pmksa,
 				   struct rsn_pmksa_cache_entry *entry,
 				   enum pmksa_free_reason reason)
 {
-	wpa_sm_remove_pmkid(pmksa->sm, entry->aa, entry->pmkid);
+	wpa_sm_remove_pmkid(pmksa->sm, entry->network_ctx, entry->aa,
+			    entry->pmkid);
 	pmksa->pmksa_count--;
 	pmksa->free_cb(entry, pmksa->ctx, reason);
 	_pmksa_cache_free_entry(entry);
@@ -245,7 +246,7 @@ pmksa_cache_add(struct rsn_pmksa_cache *pmksa, const u8 *pmk, size_t pmk_len,
 	pmksa->pmksa_count++;
 	wpa_printf(MSG_DEBUG, "RSN: Added PMKSA cache entry for " MACSTR
 		   " network_ctx=%p", MAC2STR(entry->aa), network_ctx);
-	wpa_sm_add_pmkid(pmksa->sm, entry->aa, entry->pmkid);
+	wpa_sm_add_pmkid(pmksa->sm, network_ctx, entry->aa, entry->pmkid);
 
 	return entry;
 }

src/rsn_supp/preauth.c

@@ -342,7 +342,7 @@ void rsn_preauth_candidate_process(struct wpa_sm *sm)
 		/* Some drivers (e.g., NDIS) expect to get notified about the
 		 * PMKIDs again, so report the existing data now. */
 		if (p) {
-			wpa_sm_add_pmkid(sm, candidate->bssid, p->pmkid);
+			wpa_sm_add_pmkid(sm, NULL, candidate->bssid, p->pmkid);
 		}
 
 		dl_list_del(&candidate->list);

src/rsn_supp/wpa.h

@@ -38,8 +38,10 @@ struct wpa_sm_ctx {
 	void (*cancel_auth_timeout)(void *ctx);
 	u8 * (*alloc_eapol)(void *ctx, u8 type, const void *data, u16 data_len,
 			    size_t *msg_len, void **data_pos);
-	int (*add_pmkid)(void *ctx, const u8 *bssid, const u8 *pmkid);
-	int (*remove_pmkid)(void *ctx, const u8 *bssid, const u8 *pmkid);
+	int (*add_pmkid)(void *ctx, void *network_ctx, const u8 *bssid,
+			 const u8 *pmkid);
+	int (*remove_pmkid)(void *ctx, void *network_ctx, const u8 *bssid,
+			    const u8 *pmkid);
 	void (*set_config_blob)(void *ctx, struct wpa_config_blob *blob);
 	const struct wpa_config_blob * (*get_config_blob)(void *ctx,
 							  const char *name);

src/rsn_supp/wpa_i.h

@@ -219,18 +219,18 @@ static inline u8 * wpa_sm_alloc_eapol(struct wpa_sm *sm, u8 type,
 				    msg_len, data_pos);
 }
 
-static inline int wpa_sm_add_pmkid(struct wpa_sm *sm, const u8 *bssid,
-				   const u8 *pmkid)
+static inline int wpa_sm_add_pmkid(struct wpa_sm *sm, void *network_ctx,
+				   const u8 *bssid, const u8 *pmkid)
 {
 	WPA_ASSERT(sm->ctx->add_pmkid);
-	return sm->ctx->add_pmkid(sm->ctx->ctx, bssid, pmkid);
+	return sm->ctx->add_pmkid(sm->ctx->ctx, network_ctx, bssid, pmkid);
 }
 
-static inline int wpa_sm_remove_pmkid(struct wpa_sm *sm, const u8 *bssid,
-				      const u8 *pmkid)
+static inline int wpa_sm_remove_pmkid(struct wpa_sm *sm, void *network_ctx,
+				      const u8 *bssid, const u8 *pmkid)
 {
 	WPA_ASSERT(sm->ctx->remove_pmkid);
-	return sm->ctx->remove_pmkid(sm->ctx->ctx, bssid, pmkid);
+	return sm->ctx->remove_pmkid(sm->ctx->ctx, network_ctx, bssid, pmkid);
 }
 
 static inline int wpa_sm_mlme_setprotection(struct wpa_sm *sm, const u8 *addr,

wpa_supplicant/wpas_glue.c

@@ -513,16 +513,44 @@ static int wpa_supplicant_mlme_setprotection(void *wpa_s, const u8 *addr,
 }
 
 
-static int wpa_supplicant_add_pmkid(void *wpa_s,
+static struct wpa_ssid * wpas_get_network_ctx(struct wpa_supplicant *wpa_s,
+					      void *network_ctx)
+{
+	struct wpa_ssid *ssid;
+
+	for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
+		if (network_ctx == ssid)
+			return ssid;
+	}
+
+	return NULL;
+}
+
+
+static int wpa_supplicant_add_pmkid(void *_wpa_s, void *network_ctx,
 				    const u8 *bssid, const u8 *pmkid)
 {
+	struct wpa_supplicant *wpa_s = _wpa_s;
+	struct wpa_ssid *ssid;
+
+	ssid = wpas_get_network_ctx(wpa_s, network_ctx);
+	if (ssid)
+		wpa_msg(wpa_s, MSG_INFO, PMKSA_CACHE_ADDED MACSTR " %d",
+			MAC2STR(bssid), ssid->id);
 	return wpa_drv_add_pmkid(wpa_s, bssid, pmkid);
 }
 
 
-static int wpa_supplicant_remove_pmkid(void *wpa_s,
+static int wpa_supplicant_remove_pmkid(void *_wpa_s, void *network_ctx,
 				       const u8 *bssid, const u8 *pmkid)
 {
+	struct wpa_supplicant *wpa_s = _wpa_s;
+	struct wpa_ssid *ssid;
+
+	ssid = wpas_get_network_ctx(wpa_s, network_ctx);
+	if (ssid)
+		wpa_msg(wpa_s, MSG_INFO, PMKSA_CACHE_REMOVED MACSTR " %d",
+			MAC2STR(bssid), ssid->id);
 	return wpa_drv_remove_pmkid(wpa_s, bssid, pmkid);
 }