mesh: Add MESH_PMKSA_GET/ADD commands

These commnds are mesh version of PMKSA_GET/ADD commands. So the usage
and security risk is similar to them. Refer to
commit 3459381dd2 ('External persistent
storage for PMKSA cache entries') also.

The MESH_PMKSA_GET command requires peer MAC address or "any" as an
argument and outputs appropriate stored PMKSA cache. And the
MESH_PMKSA_ADD command receives an output of MESH_PMKSA_GET and re-store
the PMKSA cache into wpa_supplicant. By using re-stored PMKSA cache,
wpa_supplicant can skip commit message creation which can use
significant CPU resources.

The output of the MESH_PMKSA_GET command uses the following format:
<BSSID> <PMKID> <PMK> <expiration in seconds>

The example of MESH_PMKSA_ADD command is this.
MESH_PMKSA_ADD 02:00:00:00:03:00 231dc1c9fa2eed0354ea49e8ff2cc2dc cb0f6c9cab358a8146488566ca155421ab4f3ea4a6de2120050c149b797018fe 42930
MESH_PMKSA_ADD 02:00:00:00:04:00 d7e595916611640d3e4e8eac02909c3c eb414a33c74831275f25c2357b3c12e3d8bd2f2aab6cf781d6ade706be71321a 43180

This functionality is disabled by default and can be enabled with
CONFIG_PMKSA_CACHE_EXTERNAL=y build configuration option.

Signed-off-by: Masashi Honma <masashi.honma@gmail.com>

src/ap/ctrl_iface_ap.c

@@ -639,3 +639,60 @@ void hostapd_ctrl_iface_pmksa_flush(struct hostapd_data *hapd)
 {
 	wpa_auth_pmksa_flush(hapd->wpa_auth);
 }
+
+
+#ifdef CONFIG_PMKSA_CACHE_EXTERNAL
+#ifdef CONFIG_MESH
+
+int hostapd_ctrl_iface_pmksa_list_mesh(struct hostapd_data *hapd,
+				       const u8 *addr, char *buf, size_t len)
+{
+	return wpa_auth_pmksa_list_mesh(hapd->wpa_auth, addr, buf, len);
+}
+
+
+void * hostapd_ctrl_iface_pmksa_create_entry(const u8 *aa, char *cmd)
+{
+	u8 spa[ETH_ALEN];
+	u8 pmkid[PMKID_LEN];
+	u8 pmk[PMK_LEN_MAX];
+	char *pos;
+	int expiration;
+
+	/*
+	 * Entry format:
+	 * <BSSID> <PMKID> <PMK> <expiration in seconds>
+	 */
+
+	if (hwaddr_aton(cmd, spa))
+		return NULL;
+
+	pos = os_strchr(cmd, ' ');
+	if (!pos)
+		return NULL;
+	pos++;
+
+	if (hexstr2bin(pos, pmkid, PMKID_LEN) < 0)
+		return NULL;
+
+	pos = os_strchr(pos, ' ');
+	if (!pos)
+		return NULL;
+	pos++;
+
+	if (hexstr2bin(pos, pmk, PMK_LEN) < 0)
+		return NULL;
+
+	pos = os_strchr(pos, ' ');
+	if (!pos)
+		return NULL;
+	pos++;
+
+	if (sscanf(pos, "%d", &expiration) != 1)
+		return NULL;
+
+	return wpa_auth_pmksa_create_entry(aa, spa, pmk, pmkid, expiration);
+}
+
+#endif /* CONFIG_MESH */
+#endif /* CONFIG_PMKSA_CACHE_EXTERNAL */

src/ap/ctrl_iface_ap.h

@@ -32,5 +32,8 @@ int hostapd_ctrl_iface_stop_ap(struct hostapd_data *hapd);
 int hostapd_ctrl_iface_pmksa_list(struct hostapd_data *hapd, char *buf,
 				  size_t len);
 void hostapd_ctrl_iface_pmksa_flush(struct hostapd_data *hapd);
+int hostapd_ctrl_iface_pmksa_list_mesh(struct hostapd_data *hapd,
+				       const u8 *addr, char *buf, size_t len);
+void * hostapd_ctrl_iface_pmksa_create_entry(const u8 *aa, char *cmd);
 
 #endif /* CTRL_IFACE_AP_H */

src/ap/pmksa_cache_auth.c

@@ -282,7 +282,42 @@ pmksa_cache_auth_add(struct rsn_pmksa_cache *pmksa,
 		     const u8 *aa, const u8 *spa, int session_timeout,
 		     struct eapol_state_machine *eapol, int akmp)
 {
-	struct rsn_pmksa_cache_entry *entry, *pos;
+	struct rsn_pmksa_cache_entry *entry;
+
+	entry = pmksa_cache_auth_create_entry(pmk, pmk_len, pmkid, kck, kck_len,
+					      aa, spa, session_timeout, eapol,
+					      akmp);
+
+	if (pmksa_cache_auth_add_entry(pmksa, entry) < 0)
+		return NULL;
+
+	return entry;
+}
+
+
+/**
+ * pmksa_cache_auth_create_entry - Create a PMKSA cache entry
+ * @pmk: The new pairwise master key
+ * @pmk_len: PMK length in bytes, usually PMK_LEN (32)
+ * @pmkid: Calculated PMKID
+ * @kck: Key confirmation key or %NULL if not yet derived
+ * @kck_len: KCK length in bytes
+ * @aa: Authenticator address
+ * @spa: Supplicant address
+ * @session_timeout: Session timeout
+ * @eapol: Pointer to EAPOL state machine data
+ * @akmp: WPA_KEY_MGMT_* used in key derivation
+ * Returns: Pointer to the added PMKSA cache entry or %NULL on error
+ *
+ * This function creates a PMKSA entry.
+ */
+struct rsn_pmksa_cache_entry *
+pmksa_cache_auth_create_entry(const u8 *pmk, size_t pmk_len, const u8 *pmkid,
+			      const u8 *kck, size_t kck_len, const u8 *aa,
+			      const u8 *spa, int session_timeout,
+			      struct eapol_state_machine *eapol, int akmp)
+{
+	struct rsn_pmksa_cache_entry *entry;
 	struct os_reltime now;
 
 	if (pmk_len > PMK_LEN_MAX)
@@ -315,9 +350,30 @@ pmksa_cache_auth_add(struct rsn_pmksa_cache *pmksa,
 	os_memcpy(entry->spa, spa, ETH_ALEN);
 	pmksa_cache_from_eapol_data(entry, eapol);
 
+	return entry;
+}
+
+
+/**
+ * pmksa_cache_auth_add_entry - Add a PMKSA cache entry
+ * @pmksa: Pointer to PMKSA cache data from pmksa_cache_auth_init()
+ * @entry: Pointer to PMKSA cache entry
+ *
+ * This function adds PMKSA cache entry to the PMKSA cache. If an old entry is
+ * already in the cache for the same Supplicant, this entry will be replaced
+ * with the new entry. PMKID will be calculated based on the PMK.
+ */
+int pmksa_cache_auth_add_entry(struct rsn_pmksa_cache *pmksa,
+			       struct rsn_pmksa_cache_entry *entry)
+{
+	struct rsn_pmksa_cache_entry *pos;
+
+	if (entry == NULL)
+		return -1;
+
 	/* Replace an old entry for the same STA (if found) with the new entry
 	 */
-	pos = pmksa_cache_auth_get(pmksa, spa, NULL);
+	pos = pmksa_cache_auth_get(pmksa, entry->spa, NULL);
 	if (pos)
 		pmksa_cache_free_entry(pmksa, pos);
 
@@ -331,7 +387,7 @@ pmksa_cache_auth_add(struct rsn_pmksa_cache *pmksa,
 
 	pmksa_cache_link_entry(pmksa, entry);
 
-	return entry;
+	return 0;
 }
 
 
@@ -605,3 +661,70 @@ int pmksa_cache_auth_list(struct rsn_pmksa_cache *pmksa, char *buf, size_t len)
 	}
 	return pos - buf;
 }
+
+
+#ifdef CONFIG_PMKSA_CACHE_EXTERNAL
+#ifdef CONFIG_MESH
+
+/**
+ * pmksa_cache_auth_list_mesh - Dump text list of entries in PMKSA cache
+ * @pmksa: Pointer to PMKSA cache data from pmksa_cache_auth_init()
+ * @addr: MAC address of the peer (NULL means any)
+ * @buf: Buffer for the list
+ * @len: Length of the buffer
+ * Returns: Number of bytes written to buffer
+ *
+ * This function is used to generate a text format representation of the
+ * current PMKSA cache contents for the ctrl_iface PMKSA_GET command to store
+ * in external storage.
+ */
+int pmksa_cache_auth_list_mesh(struct rsn_pmksa_cache *pmksa, const u8 *addr,
+			       char *buf, size_t len)
+{
+	int ret;
+	char *pos, *end;
+	struct rsn_pmksa_cache_entry *entry;
+	struct os_reltime now;
+
+	pos = buf;
+	end = buf + len;
+	os_get_reltime(&now);
+
+
+	/*
+	 * Entry format:
+	 * <BSSID> <PMKID> <PMK> <expiration in seconds>
+	 */
+	for (entry = pmksa->pmksa; entry; entry = entry->next) {
+		if (addr && os_memcmp(entry->spa, addr, ETH_ALEN) != 0)
+			continue;
+
+		ret = os_snprintf(pos, end - pos, MACSTR " ",
+				  MAC2STR(entry->spa));
+		if (os_snprintf_error(end - pos, ret))
+			return 0;
+		pos += ret;
+
+		pos += wpa_snprintf_hex(pos, end - pos, entry->pmkid,
+					PMKID_LEN);
+
+		ret = os_snprintf(pos, end - pos, " ");
+		if (os_snprintf_error(end - pos, ret))
+			return 0;
+		pos += ret;
+
+		pos += wpa_snprintf_hex(pos, end - pos, entry->pmk,
+					entry->pmk_len);
+
+		ret = os_snprintf(pos, end - pos, " %d\n",
+				  (int) (entry->expiration - now.sec));
+		if (os_snprintf_error(end - pos, ret))
+			return 0;
+		pos += ret;
+	}
+
+	return pos - buf;
+}
+
+#endif /* CONFIG_MESH */
+#endif /* CONFIG_PMKSA_CACHE_EXTERNAL */

src/ap/pmksa_cache_auth.h

@@ -53,6 +53,13 @@ pmksa_cache_auth_add(struct rsn_pmksa_cache *pmksa,
 		     const u8 *aa, const u8 *spa, int session_timeout,
 		     struct eapol_state_machine *eapol, int akmp);
 struct rsn_pmksa_cache_entry *
+pmksa_cache_auth_create_entry(const u8 *pmk, size_t pmk_len, const u8 *pmkid,
+			      const u8 *kck, size_t kck_len, const u8 *aa,
+			      const u8 *spa, int session_timeout,
+			      struct eapol_state_machine *eapol, int akmp);
+int pmksa_cache_auth_add_entry(struct rsn_pmksa_cache *pmksa,
+			       struct rsn_pmksa_cache_entry *entry);
+struct rsn_pmksa_cache_entry *
 pmksa_cache_add_okc(struct rsn_pmksa_cache *pmksa,
 		    const struct rsn_pmksa_cache_entry *old_entry,
 		    const u8 *aa, const u8 *pmkid);
@@ -65,5 +72,7 @@ int pmksa_cache_auth_radius_das_disconnect(struct rsn_pmksa_cache *pmksa,
 					   struct radius_das_attrs *attr);
 int pmksa_cache_auth_list(struct rsn_pmksa_cache *pmksa, char *buf, size_t len);
 void pmksa_cache_auth_flush(struct rsn_pmksa_cache *pmksa);
+int pmksa_cache_auth_list_mesh(struct rsn_pmksa_cache *pmksa, const u8 *addr,
+			       char *buf, size_t len);
 
 #endif /* PMKSA_CACHE_H */

src/ap/wpa_auth.c

@@ -3850,6 +3850,58 @@ void wpa_auth_pmksa_flush(struct wpa_authenticator *wpa_auth)
 }
 
 
+#ifdef CONFIG_PMKSA_CACHE_EXTERNAL
+#ifdef CONFIG_MESH
+
+int wpa_auth_pmksa_list_mesh(struct wpa_authenticator *wpa_auth, const u8 *addr,
+			     char *buf, size_t len)
+{
+	if (!wpa_auth || !wpa_auth->pmksa)
+		return 0;
+
+	return pmksa_cache_auth_list_mesh(wpa_auth->pmksa, addr, buf, len);
+}
+
+
+struct rsn_pmksa_cache_entry *
+wpa_auth_pmksa_create_entry(const u8 *aa, const u8 *spa, const u8 *pmk,
+			    const u8 *pmkid, int expiration)
+{
+	struct rsn_pmksa_cache_entry *entry;
+	struct os_reltime now;
+
+	entry = pmksa_cache_auth_create_entry(pmk, PMK_LEN, pmkid, NULL, 0, aa,
+					      spa, 0, NULL, WPA_KEY_MGMT_SAE);
+	if (!entry)
+		return NULL;
+
+	os_get_reltime(&now);
+	entry->expiration = now.sec + expiration;
+	return entry;
+}
+
+
+int wpa_auth_pmksa_add_entry(struct wpa_authenticator *wpa_auth,
+			     struct rsn_pmksa_cache_entry *entry)
+{
+	int ret;
+
+	if (!wpa_auth || !wpa_auth->pmksa)
+		return -1;
+
+	ret = pmksa_cache_auth_add_entry(wpa_auth->pmksa, entry);
+	if (ret < 0)
+		wpa_printf(MSG_DEBUG,
+			   "RSN: Failed to store external PMKSA cache for "
+			   MACSTR, MAC2STR(entry->spa));
+
+	return ret;
+}
+
+#endif /* CONFIG_MESH */
+#endif /* CONFIG_PMKSA_CACHE_EXTERNAL */
+
+
 struct rsn_pmksa_cache_entry *
 wpa_auth_pmksa_get(struct wpa_authenticator *wpa_auth, const u8 *sta_addr,
 		   const u8 *pmkid)

src/ap/wpa_auth.h

@@ -302,6 +302,13 @@ void wpa_auth_pmksa_remove(struct wpa_authenticator *wpa_auth,
 int wpa_auth_pmksa_list(struct wpa_authenticator *wpa_auth, char *buf,
 			size_t len);
 void wpa_auth_pmksa_flush(struct wpa_authenticator *wpa_auth);
+int wpa_auth_pmksa_list_mesh(struct wpa_authenticator *wpa_auth, const u8 *addr,
+			     char *buf, size_t len);
+struct rsn_pmksa_cache_entry *
+wpa_auth_pmksa_create_entry(const u8 *aa, const u8 *spa, const u8 *pmk,
+			    const u8 *pmkid, int expiration);
+int wpa_auth_pmksa_add_entry(struct wpa_authenticator *wpa_auth,
+			     struct rsn_pmksa_cache_entry *entry);
 struct rsn_pmksa_cache_entry *
 wpa_auth_pmksa_get(struct wpa_authenticator *wpa_auth, const u8 *sta_addr,
 		   const u8 *pmkid);

wpa_supplicant/ap.c

@@ -1437,6 +1437,43 @@ void wpas_ap_pmksa_cache_flush(struct wpa_supplicant *wpa_s)
 	if (wpa_s->ifmsh)
 		hostapd_ctrl_iface_pmksa_flush(wpa_s->ifmsh->bss[0]);
 }
+
+
+#ifdef CONFIG_PMKSA_CACHE_EXTERNAL
+#ifdef CONFIG_MESH
+
+int wpas_ap_pmksa_cache_list_mesh(struct wpa_supplicant *wpa_s, const u8 *addr,
+				  char *buf, size_t len)
+{
+	return hostapd_ctrl_iface_pmksa_list_mesh(wpa_s->ifmsh->bss[0], addr,
+						  &buf[0], len);
+}
+
+
+int wpas_ap_pmksa_cache_add_external(struct wpa_supplicant *wpa_s, char *cmd)
+{
+	struct external_pmksa_cache *entry;
+	void *pmksa_cache;
+
+	pmksa_cache = hostapd_ctrl_iface_pmksa_create_entry(wpa_s->own_addr,
+							    cmd);
+	if (!pmksa_cache)
+		return -1;
+
+	entry = os_zalloc(sizeof(struct external_pmksa_cache));
+	if (!entry)
+		return -1;
+
+	entry->pmksa_cache = pmksa_cache;
+
+	dl_list_add(&wpa_s->mesh_external_pmksa_cache, &entry->list);
+
+	return 0;
+}
+
+#endif /* CONFIG_MESH */
+#endif /* CONFIG_PMKSA_CACHE_EXTERNAL */
+
 #endif /* CONFIG_CTRL_IFACE */
 
 

wpa_supplicant/ap.h

@@ -85,6 +85,9 @@ int wpas_ap_stop_ap(struct wpa_supplicant *wpa_s);
 int wpas_ap_pmksa_cache_list(struct wpa_supplicant *wpa_s, char *buf,
 			     size_t len);
 void wpas_ap_pmksa_cache_flush(struct wpa_supplicant *wpa_s);
+int wpas_ap_pmksa_cache_list_mesh(struct wpa_supplicant *wpa_s, const u8 *addr,
+				  char *buf, size_t len);
+int wpas_ap_pmksa_cache_add_external(struct wpa_supplicant *wpa_s, char *cmd);
 
 void wpas_event_dfs_radar_detected(struct wpa_supplicant *wpa_s,
 				   struct dfs_event *radar);

wpa_supplicant/ctrl_iface.c

@@ -9114,6 +9114,40 @@ fail:
 	return ret;
 }
 
+
+#ifdef CONFIG_MESH
+
+static int wpas_ctrl_iface_mesh_pmksa_get(struct wpa_supplicant *wpa_s,
+					  const char *cmd, char *buf,
+					  size_t buflen)
+{
+	u8 spa[ETH_ALEN];
+
+	if (!wpa_s->ifmsh)
+		return -1;
+
+	if (os_strcasecmp(cmd, "any") == 0)
+		return wpas_ap_pmksa_cache_list_mesh(wpa_s, NULL, buf, buflen);
+
+	if (hwaddr_aton(cmd, spa))
+		return -1;
+
+	return wpas_ap_pmksa_cache_list_mesh(wpa_s, spa, buf, buflen);
+}
+
+
+static int wpas_ctrl_iface_mesh_pmksa_add(struct wpa_supplicant *wpa_s,
+					  char *cmd)
+{
+	/*
+	 * We do not check mesh interface existance because PMKSA should be
+	 * stored before wpa_s->ifmsh creation to suppress commit message
+	 * creation.
+	 */
+	return wpas_ap_pmksa_cache_add_external(wpa_s, cmd);
+}
+
+#endif /* CONFIG_MESH */
 #endif /* CONFIG_PMKSA_CACHE_EXTERNAL */
 
 
@@ -9198,6 +9232,14 @@ char * wpa_supplicant_ctrl_iface_process(struct wpa_supplicant *wpa_s,
 	} else if (os_strncmp(buf, "PMKSA_ADD ", 10) == 0) {
 		if (wpas_ctrl_iface_pmksa_add(wpa_s, buf + 10) < 0)
 			reply_len = -1;
+#ifdef CONFIG_MESH
+	} else if (os_strncmp(buf, "MESH_PMKSA_GET ", 15) == 0) {
+		reply_len = wpas_ctrl_iface_mesh_pmksa_get(wpa_s, buf + 15,
+							   reply, reply_size);
+	} else if (os_strncmp(buf, "MESH_PMKSA_ADD ", 15) == 0) {
+		if (wpas_ctrl_iface_mesh_pmksa_add(wpa_s, buf + 15) < 0)
+			reply_len = -1;
+#endif /* CONFIG_MESH */
 #endif /* CONFIG_PMKSA_CACHE_EXTERNAL */
 	} else if (os_strncmp(buf, "SET ", 4) == 0) {
 		if (wpa_supplicant_ctrl_iface_set(wpa_s, buf + 4))

wpa_supplicant/mesh_rsn.c

@@ -224,6 +224,9 @@ struct mesh_rsn *mesh_rsn_auth_init(struct wpa_supplicant *wpa_s,
 	struct hostapd_data *bss = wpa_s->ifmsh->bss[0];
 	const u8 *ie;
 	size_t ie_len;
+#ifdef CONFIG_PMKSA_CACHE_EXTERNAL
+	struct external_pmksa_cache *entry;
+#endif /* CONFIG_PMKSA_CACHE_EXTERNAL */
 
 	mesh_rsn = os_zalloc(sizeof(*mesh_rsn));
 	if (mesh_rsn == NULL)
@@ -242,6 +245,22 @@ struct mesh_rsn *mesh_rsn_auth_init(struct wpa_supplicant *wpa_s,
 
 	bss->wpa_auth = mesh_rsn->auth;
 
+#ifdef CONFIG_PMKSA_CACHE_EXTERNAL
+	while ((entry = dl_list_last(&wpa_s->mesh_external_pmksa_cache,
+				     struct external_pmksa_cache,
+				     list)) != NULL) {
+		int ret;
+
+		ret = wpa_auth_pmksa_add_entry(bss->wpa_auth,
+					       entry->pmksa_cache);
+		dl_list_del(&entry->list);
+		os_free(entry);
+
+		if (ret < 0)
+			return NULL;
+	}
+#endif /* CONFIG_PMKSA_CACHE_EXTERNAL */
+
 	ie = wpa_auth_get_wpa_ie(mesh_rsn->auth, &ie_len);
 	conf->rsn_ie = (u8 *) ie;
 	conf->rsn_ie_len = ie_len;

wpa_supplicant/wpa_cli.c

@@ -348,6 +348,23 @@ static int wpa_cli_cmd_pmksa_add(struct wpa_ctrl *ctrl, int argc, char *argv[])
 	return wpa_cli_cmd(ctrl, "PMKSA_ADD", 8, argc, argv);
 }
 
+
+#ifdef CONFIG_MESH
+
+static int wpa_cli_mesh_cmd_pmksa_get(struct wpa_ctrl *ctrl, int argc,
+				      char *argv[])
+{
+	return wpa_cli_cmd(ctrl, "MESH_PMKSA_GET", 1, argc, argv);
+}
+
+
+static int wpa_cli_mesh_cmd_pmksa_add(struct wpa_ctrl *ctrl, int argc,
+				      char *argv[])
+{
+	return wpa_cli_cmd(ctrl, "MESH_PMKSA_ADD", 4, argc, argv);
+}
+
+#endif /* CONFIG_MESH */
 #endif /* CONFIG_PMKSA_CACHE_EXTERNAL */
 
 
@@ -2892,6 +2909,14 @@ static const struct wpa_cli_cmd wpa_cli_commands[] = {
 	{ "pmksa_add", wpa_cli_cmd_pmksa_add, NULL,
 	  cli_cmd_flag_sensitive,
 	  "<network_id> <BSSID> <PMKID> <PMK> <reauth_time in seconds> <expiration in seconds> <akmp> <opportunistic> = store PMKSA cache entry from external storage" },
+#ifdef CONFIG_MESH
+	{ "mesh_pmksa_get", wpa_cli_mesh_cmd_pmksa_get, NULL,
+	  cli_cmd_flag_none,
+	  "<peer MAC address | any> = fetch all stored mesh PMKSA cache entries" },
+	{ "mesh_pmksa_add", wpa_cli_mesh_cmd_pmksa_add, NULL,
+	  cli_cmd_flag_sensitive,
+	  "<BSSID> <PMKID> <PMK> <expiration in seconds> = store mesh PMKSA cache entry from external storage" },
+#endif /* CONFIG_MESH */
 #endif /* CONFIG_PMKSA_CACHE_EXTERNAL */
 	{ "reassociate", wpa_cli_cmd_reassociate, NULL,
 	  cli_cmd_flag_none,

wpa_supplicant/wpa_supplicant.c

@@ -586,6 +586,22 @@ static void wpa_supplicant_cleanup(struct wpa_supplicant *wpa_s)
 	wpabuf_free(wpa_s->lci);
 	wpa_s->lci = NULL;
 	wpas_clear_beacon_rep_data(wpa_s);
+
+#ifdef CONFIG_PMKSA_CACHE_EXTERNAL
+#ifdef CONFIG_MESH
+	{
+		struct external_pmksa_cache *entry;
+
+		while ((entry = dl_list_last(&wpa_s->mesh_external_pmksa_cache,
+					     struct external_pmksa_cache,
+					     list)) != NULL) {
+			dl_list_del(&entry->list);
+			os_free(entry->pmksa_cache);
+			os_free(entry);
+		}
+	}
+#endif /* CONFIG_MESH */
+#endif /* CONFIG_PMKSA_CACHE_EXTERNAL */
 }
 
 
@@ -4977,6 +4993,12 @@ static int wpa_supplicant_init_iface(struct wpa_supplicant *wpa_s,
 	if (wpa_bss_init(wpa_s) < 0)
 		return -1;
 
+#ifdef CONFIG_PMKSA_CACHE_EXTERNAL
+#ifdef CONFIG_MESH
+	dl_list_init(&wpa_s->mesh_external_pmksa_cache);
+#endif /* CONFIG_MESH */
+#endif /* CONFIG_PMKSA_CACHE_EXTERNAL */
+
 	/*
 	 * Set Wake-on-WLAN triggers, if configured.
 	 * Note: We don't restore/remove the triggers on shutdown (it doesn't

wpa_supplicant/wpa_supplicant_i.h

@@ -461,6 +461,11 @@ struct beacon_rep_data {
 };
 
 
+struct external_pmksa_cache {
+	struct dl_list list;
+	void *pmksa_cache;
+};
+
 /**
  * struct wpa_supplicant - Internal data for wpa_supplicant interface
  *
@@ -791,6 +796,10 @@ struct wpa_supplicant {
 	unsigned int mesh_if_created:1;
 	unsigned int mesh_ht_enabled:1;
 	unsigned int mesh_vht_enabled:1;
+#ifdef CONFIG_PMKSA_CACHE_EXTERNAL
+	/* struct external_pmksa_cache::list */
+	struct dl_list mesh_external_pmksa_cache;
+#endif /* CONFIG_PMKSA_CACHE_EXTERNAL */
 #endif /* CONFIG_MESH */
 
 	unsigned int off_channel_freq;