Пример #1
0
struct fst_session * fst_session_create(struct fst_group *g)
{
	struct fst_session *s;
	u32 id;

	WPA_ASSERT(!is_zero_ether_addr(own_addr));

	id = fst_find_free_session_id();
	if (id == FST_INVALID_SESSION_ID) {
		fst_printf(MSG_ERROR, "Cannot assign new session ID");
		return NULL;
	}

	s = os_zalloc(sizeof(*s));
	if (!s) {
		fst_printf(MSG_ERROR, "Cannot allocate new session object");
		return NULL;
	}

	s->id = id;
	s->group = g;
	s->state = FST_SESSION_STATE_INITIAL;

	s->data.llt_ms = FST_LLT_MS_DEFAULT;

	fst_printf(MSG_INFO, "Session %u created", s->id);

	dl_list_add_tail(&global_sessions_list, &s->global_sessions_lentry);

	foreach_fst_ctrl_call(on_session_added, s);

	return s;
}
Пример #2
0
void fst_session_delete(struct fst_session *s)
{
	fst_printf(MSG_INFO, "Session %u deleted", s->id);
	dl_list_del(&s->global_sessions_lentry);
	foreach_fst_ctrl_call(on_session_removed, s);
	os_free(s);
}
Пример #3
0
struct fst_iface * fst_attach(const char *ifname, const u8 *own_addr,
			      const struct fst_wpa_obj *iface_obj,
			      const struct fst_iface_cfg *cfg)
{
	struct fst_group *g;
	struct fst_group *group = NULL;
	struct fst_iface *iface = NULL;
	Boolean new_group = FALSE;

	WPA_ASSERT(ifname != NULL);
	WPA_ASSERT(iface_obj != NULL);
	WPA_ASSERT(cfg != NULL);

	foreach_fst_group(g) {
		if (os_strcmp(cfg->group_id, fst_group_get_id(g)) == 0) {
			group = g;
			break;
		}
	}

	if (!group) {
		group = fst_group_create(cfg->group_id);
		if (!group) {
			fst_printf(MSG_ERROR, "%s: FST group cannot be created",
				   cfg->group_id);
			return NULL;
		}
		new_group = TRUE;
	}

	iface = fst_iface_create(group, ifname, own_addr, iface_obj, cfg);
	if (!iface) {
		fst_printf_group(group, MSG_ERROR, "cannot create iface for %s",
				 ifname);
		if (new_group)
			fst_group_delete(group);
		return NULL;
	}

	fst_group_attach_iface(group, iface);
	fst_group_update_ie(group);

	foreach_fst_ctrl_call(on_iface_added, iface);

	fst_printf_iface(iface, MSG_DEBUG,
			 "iface attached to group %s (prio=%d, llt=%d)",
			 cfg->group_id, cfg->priority, cfg->llt);

	return iface;
}
Пример #4
0
static void fst_session_handle_setup_request(struct fst_iface *iface,
					     const struct ieee80211_mgmt *mgmt,
					     size_t frame_len)
{
	struct fst_session *s;
	const struct fst_setup_req *req;
	struct fst_iface *new_iface = NULL;
	struct fst_group *g;
	u8 new_iface_peer_addr[ETH_ALEN];
	const struct wpabuf *peer_mbies;
	size_t plen;

	if (frame_len < IEEE80211_HDRLEN + 1 + sizeof(*req))  {
		fst_printf_iface(iface, MSG_WARNING,
				 "FST Request dropped: too short (%zu < %zu)",
				 frame_len,
				 IEEE80211_HDRLEN + 1 + sizeof(*req));
		return;
	}
	plen = frame_len - IEEE80211_HDRLEN - 1;
	req = (const struct fst_setup_req *)
		(((const u8 *) mgmt) + IEEE80211_HDRLEN + 1);
	if (req->stie.element_id != WLAN_EID_SESSION_TRANSITION ||
	    req->stie.length < 11) {
		fst_printf_iface(iface, MSG_WARNING,
				 "FST Request dropped: invalid STIE");
		return;
	}

	if (req->stie.new_band_id == req->stie.old_band_id) {
		fst_printf_iface(iface, MSG_WARNING,
				 "FST Request dropped: new and old band IDs are the same");
		return;
	}

	g = fst_iface_get_group(iface);

	if (plen > sizeof(*req)) {
		fst_iface_update_mb_ie(iface, mgmt->sa, (const u8 *) (req + 1),
				       plen - sizeof(*req));
		fst_printf_iface(iface, MSG_INFO,
				 "FST Request: MB IEs updated for " MACSTR,
				 MAC2STR(mgmt->sa));
	}

	peer_mbies = fst_iface_get_peer_mb_ie(iface, mgmt->sa);
	if (peer_mbies) {
		new_iface = fst_group_get_new_iface_by_stie_and_mbie(
			g, wpabuf_head(peer_mbies), wpabuf_len(peer_mbies),
			&req->stie, new_iface_peer_addr);
		if (new_iface)
			fst_printf_iface(iface, MSG_INFO,
					 "FST Request: new iface (%s:" MACSTR
					 ") found by MB IEs",
					 fst_iface_get_name(new_iface),
					 MAC2STR(new_iface_peer_addr));
	}

	if (!new_iface) {
		new_iface = fst_group_find_new_iface_by_stie(
			g, iface, mgmt->sa, &req->stie,
			new_iface_peer_addr);
		if (new_iface)
			fst_printf_iface(iface, MSG_INFO,
					 "FST Request: new iface (%s:" MACSTR
					 ") found by others",
					 fst_iface_get_name(new_iface),
					 MAC2STR(new_iface_peer_addr));
	}

	if (!new_iface) {
		fst_printf_iface(iface, MSG_WARNING,
				 "FST Request dropped: new iface not found");
		return;
	}

	s = fst_find_session_in_progress(mgmt->sa, g);
	if (s) {
		union fst_session_state_switch_extra evext = {
			.to_initial = {
				.reason = REASON_SETUP,
			},
		};

		/*
		 * 10.32.2.2  Transitioning between states:
		 * Upon receipt of an FST Setup Request frame, the responder
		 * shall respond with an FST Setup Response frame unless it has
		 * a pending FST Setup Request frame addressed to the initiator
		 * and the responder has a numerically larger MAC address than
		 * the initiator’s MAC address, in which case, the responder
		 * shall delete the received FST Setup Request.
		 */
		if (os_memcmp(mgmt->da, mgmt->sa, ETH_ALEN) > 0) {
			fst_printf_session(s, MSG_WARNING,
					   "FST Request dropped due to MAC comparison (our MAC is "
					   MACSTR ")",
					   MAC2STR(mgmt->da));
			return;
		}

		if (!fst_session_is_ready_pending(s)) {
			fst_printf_session(s, MSG_WARNING,
					   "FST Request from " MACSTR
					   " dropped due to inappropriate state %s",
					   MAC2STR(mgmt->da),
					   fst_session_state_name(s->state));
			return;
		}


		/*
		 * If FST Setup Request arrived with the same FSTS ID as one we
		 * initialized before, it means the other side either didn't
		 * receive our FST Request or skipped it for some reason (for
		 * example, due to numerical MAC comparison).
		 *
		 * In this case, there's no need to tear down the session.
		 * Moreover, as FSTS ID is the same, the other side will
		 * associate this tear down with the session it initiated that
		 * will break the sync.
		 */
		if (le_to_host32(req->stie.fsts_id) != s->data.fsts_id)
			fst_session_send_tear_down(s);
		else
			fst_printf_session(s, MSG_WARNING,
					   "Skipping TearDown as the FST request has the same FSTS ID as initiated");
		fst_session_set_state(s, FST_SESSION_STATE_INITIAL, &evext);
		fst_session_stt_disarm(s);
		fst_printf_session(s, MSG_WARNING, "reset due to FST request");
	}

	s = fst_session_create(g);
	if (!s) {
		fst_printf(MSG_WARNING,
			   "FST Request dropped: cannot create session for %s and %s",
			   fst_iface_get_name(iface),
			   fst_iface_get_name(new_iface));
		return;
	}

	fst_session_set_iface(s, iface, TRUE);
	fst_session_set_peer_addr(s, mgmt->sa, TRUE);
	fst_session_set_iface(s, new_iface, FALSE);
	fst_session_set_peer_addr(s, new_iface_peer_addr, FALSE);
	fst_session_set_llt(s, FST_LLT_VAL_TO_MS(le_to_host32(req->llt)));
	s->data.pending_setup_req_dlgt = req->dialog_token;
	s->data.fsts_id = le_to_host32(req->stie.fsts_id);

	fst_session_stt_arm(s);

	fst_session_notify_ctrl(s, EVENT_FST_SETUP, NULL);

	fst_session_set_state(s, FST_SESSION_STATE_SETUP_COMPLETION, NULL);
}
Пример #5
0
static void fst_session_handle_setup_request(struct fst_iface *iface,
					     const struct ieee80211_mgmt *mgmt,
					     size_t frame_len)
{
	struct fst_session *s;
	const struct fst_setup_req *req;
	struct fst_iface *new_iface = NULL;
	struct fst_group *g;
	u8 new_iface_peer_addr[ETH_ALEN];
	size_t plen;

	if (frame_len < IEEE80211_HDRLEN + 1 + sizeof(*req))  {
		fst_printf_iface(iface, MSG_WARNING,
				 "FST Request dropped: too short (%zu < %zu)",
				 frame_len,
				 IEEE80211_HDRLEN + 1 + sizeof(*req));
		return;
	}
	plen = frame_len - IEEE80211_HDRLEN - 1;
	req = (const struct fst_setup_req *)
		(((const u8 *) mgmt) + IEEE80211_HDRLEN + 1);
	if (req->stie.element_id != WLAN_EID_SESSION_TRANSITION ||
	    req->stie.length < 11) {
		fst_printf_iface(iface, MSG_WARNING,
				 "FST Request dropped: invalid STIE");
		return;
	}

	if (req->stie.new_band_id == req->stie.old_band_id) {
		fst_printf_iface(iface, MSG_WARNING,
				 "FST Request dropped: new and old band IDs are the same");
		return;
	}

	g = fst_iface_get_group(iface);

	if (plen > sizeof(*req)) {
		fst_iface_update_mb_ie(iface, mgmt->sa, (const u8 *) (req + 1),
				       plen - sizeof(*req));
		fst_printf_iface(iface, MSG_INFO,
				 "FST Request: MB IEs updated for " MACSTR,
				 MAC2STR(mgmt->sa));
	}

	new_iface = fst_group_get_peer_other_connection(iface, mgmt->sa,
							req->stie.new_band_id,
							new_iface_peer_addr);
	if (!new_iface) {
		fst_printf_iface(iface, MSG_WARNING,
				 "FST Request dropped: new iface not found");
		return;
	}
	fst_printf_iface(iface, MSG_INFO,
			 "FST Request: new iface (%s:" MACSTR ") found",
			 fst_iface_get_name(new_iface),
			 MAC2STR(new_iface_peer_addr));

	s = fst_find_session_in_progress(mgmt->sa, g);
	if (s) {
		union fst_session_state_switch_extra evext = {
			.to_initial = {
				.reason = REASON_SETUP,
			},
		};

		/*
		 * 10.32.2.2  Transitioning between states:
		 * Upon receipt of an FST Setup Request frame, the responder
		 * shall respond with an FST Setup Response frame unless it has
		 * a pending FST Setup Request frame addressed to the initiator
		 * and the responder has a numerically larger MAC address than
		 * the initiator’s MAC address, in which case, the responder
		 * shall delete the received FST Setup Request.
		 */
		if (fst_session_is_ready_pending(s) &&
		    /* waiting for Setup Response */
		    os_memcmp(mgmt->da, mgmt->sa, ETH_ALEN) > 0) {
			fst_printf_session(s, MSG_WARNING,
					   "FST Request dropped due to MAC comparison (our MAC is "
					   MACSTR ")",
					   MAC2STR(mgmt->da));
			return;
		}

		/*
		 * State is SETUP_COMPLETION (either in transition or not) or
		 * TRANSITION_DONE (in transition).
		 * Setup Request arriving in this state could mean:
		 * 1. peer sent it before receiving our Setup Request (race
		 *    condition)
		 * 2. peer didn't receive our Setup Response. Peer is retrying
		 *    after STT timeout
		 * 3. peer's FST state machines are out of sync due to some
		 *    other reason
		 *
		 * We will reset our session and create a new one instead.
		 */

		fst_printf_session(s, MSG_WARNING,
			"resetting due to FST request");

		/*
		 * If FST Setup Request arrived with the same FSTS ID as one we
		 * initialized before, there's no need to tear down the session.
		 * Moreover, as FSTS ID is the same, the other side will
		 * associate this tear down with the session it initiated that
		 * will break the sync.
		 */
		if (le_to_host32(req->stie.fsts_id) != s->data.fsts_id)
			fst_session_send_tear_down(s);
		else
			fst_printf_session(s, MSG_WARNING,
					   "Skipping TearDown as the FST request has the same FSTS ID as initiated");
		fst_session_set_state(s, FST_SESSION_STATE_INITIAL, &evext);
		fst_session_stt_disarm(s);
	}

	s = fst_session_create(g);
	if (!s) {
		fst_printf(MSG_WARNING,
			   "FST Request dropped: cannot create session for %s and %s",
			   fst_iface_get_name(iface),
			   fst_iface_get_name(new_iface));
		return;
	}

	fst_session_set_iface(s, iface, TRUE);
	fst_session_set_peer_addr(s, mgmt->sa, TRUE);
	fst_session_set_iface(s, new_iface, FALSE);
	fst_session_set_peer_addr(s, new_iface_peer_addr, FALSE);
	fst_session_set_llt(s, FST_LLT_VAL_TO_MS(le_to_host32(req->llt)));
	s->data.pending_setup_req_dlgt = req->dialog_token;
	s->data.fsts_id = le_to_host32(req->stie.fsts_id);

	fst_session_stt_arm(s);

	fst_session_notify_ctrl(s, EVENT_FST_SETUP, NULL);

	fst_session_set_state(s, FST_SESSION_STATE_SETUP_COMPLETION, NULL);
}