TDLS: Allow wpa_cli tdls_setup to start renegotiation

If there is already a link the requested peer, request start of
renegotiation instead of completely new link. This seems to be needed
to allow some driver to accept the trigger for a new negotiation.

src/rsn_supp/tdls.c

@@ -1825,6 +1825,22 @@ int wpa_tdls_start(struct wpa_sm *sm, const u8 *addr)
 }
 
 
+int wpa_tdls_reneg(struct wpa_sm *sm, const u8 *addr)
+{
+	struct wpa_tdls_peer *peer;
+
+	for (peer = sm->tdls; peer; peer = peer->next) {
+		if (os_memcmp(peer->addr, addr, ETH_ALEN) == 0)
+			break;
+	}
+
+	if (peer == NULL || !peer->tpk_success)
+		return -1;
+
+	return wpa_tdls_start(sm, addr);
+}
+
+
 /**
  * wpa_supplicant_rx_tdls - Receive TDLS data frame
  *

src/rsn_supp/wpa.h

@@ -339,6 +339,7 @@ wpa_ft_validate_reassoc_resp(struct wpa_sm *sm, const u8 *ies, size_t ies_len,
 
 /* tdls.c */
 int wpa_tdls_start(struct wpa_sm *sm, const u8 *addr);
+int wpa_tdls_reneg(struct wpa_sm *sm, const u8 *addr);
 int wpa_tdls_recv_teardown_notify(struct wpa_sm *sm, const u8 *addr,
 				  u16 reason_code);
 int wpa_tdls_init(struct wpa_sm *sm);

wpa_supplicant/ctrl_iface.c

@@ -211,6 +211,7 @@ static int wpa_supplicant_ctrl_iface_tdls_setup(
 	struct wpa_supplicant *wpa_s, char *addr)
 {
 	u8 peer[ETH_ALEN];
+	int ret;
 
 	if (hwaddr_aton(addr, peer)) {
 		wpa_printf(MSG_DEBUG, "CTRL_IFACE TDLS_SETUP: invalid "
@@ -221,7 +222,10 @@ static int wpa_supplicant_ctrl_iface_tdls_setup(
 	wpa_printf(MSG_DEBUG, "CTRL_IFACE TDLS_SETUP " MACSTR,
 		   MAC2STR(peer));
 
-	return wpa_drv_tdls_oper(wpa_s, TDLS_SETUP, peer);
+	ret = wpa_tdls_reneg(wpa_s->wpa, peer);
+	if (ret)
+		ret = wpa_drv_tdls_oper(wpa_s, TDLS_SETUP, peer);
+	return ret;
 }