P2P: Publish more connected clients info in Probe Response frames

This commit increases the maximum buffer size for P2P Client Info
advertized by the Group Owner in the Probe Response frames.

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

src/p2p/p2p_group.c

@@ -169,6 +169,39 @@ static void p2p_group_add_noa(struct wpabuf *ie, struct wpabuf *noa)
 }
 
 
+static struct wpabuf * p2p_group_encaps_probe_resp(struct wpabuf *subelems)
+{
+	struct wpabuf *ie;
+	const u8 *pos, *end;
+	size_t len;
+
+	if (subelems == NULL)
+		return NULL;
+
+	len = wpabuf_len(subelems) + 100;
+
+	ie = wpabuf_alloc(len);
+	if (ie == NULL)
+		return NULL;
+
+	pos = wpabuf_head(subelems);
+	end = pos + wpabuf_len(subelems);
+
+	while (end > pos) {
+		size_t frag_len = end - pos;
+		if (frag_len > 251)
+			frag_len = 251;
+		wpabuf_put_u8(ie, WLAN_EID_VENDOR_SPECIFIC);
+		wpabuf_put_u8(ie, 4 + frag_len);
+		wpabuf_put_be32(ie, P2P_IE_VENDOR_TYPE);
+		wpabuf_put_data(ie, pos, frag_len);
+		pos += frag_len;
+	}
+
+	return ie;
+}
+
+
 static struct wpabuf * p2p_group_build_beacon_ie(struct p2p_group *group)
 {
 	struct wpabuf *ie;
@@ -367,9 +400,8 @@ static void wifi_display_group_update(struct p2p_group *group)
 static struct wpabuf * p2p_group_build_probe_resp_ie(struct p2p_group *group)
 {
 	u8 *group_info;
-	struct wpabuf *ie;
+	struct wpabuf *p2p_subelems, *ie;
 	struct p2p_group_member *m;
-	u8 *len;
 	size_t extra = 0;
 
 #ifdef CONFIG_WIFI_DISPLAY
@@ -377,33 +409,32 @@ static struct wpabuf * p2p_group_build_probe_resp_ie(struct p2p_group *group)
 		extra += wpabuf_len(group->wfd_ie);
 #endif /* CONFIG_WIFI_DISPLAY */
 
-	ie = wpabuf_alloc(257 + extra);
-	if (ie == NULL)
+	p2p_subelems = wpabuf_alloc(500 + extra);
+	if (p2p_subelems == NULL)
 		return NULL;
 
 #ifdef CONFIG_WIFI_DISPLAY
 	if (group->wfd_ie)
-		wpabuf_put_buf(ie, group->wfd_ie);
+		wpabuf_put_buf(p2p_subelems, group->wfd_ie);
 #endif /* CONFIG_WIFI_DISPLAY */
 
-	len = p2p_buf_add_ie_hdr(ie);
-
-	p2p_group_add_common_ies(group, ie);
-	p2p_group_add_noa(ie, group->noa);
+	p2p_group_add_common_ies(group, p2p_subelems);
+	p2p_group_add_noa(p2p_subelems, group->noa);
 
 	/* P2P Device Info */
-	p2p_buf_add_device_info(ie, group->p2p, NULL);
+	p2p_buf_add_device_info(p2p_subelems, group->p2p, NULL);
 
 	/* P2P Group Info */
-	group_info = wpabuf_put(ie, 0);
-	wpabuf_put_u8(ie, P2P_ATTR_GROUP_INFO);
-	wpabuf_put_le16(ie, 0); /* Length to be filled */
+	group_info = wpabuf_put(p2p_subelems, 0);
+	wpabuf_put_u8(p2p_subelems, P2P_ATTR_GROUP_INFO);
+	wpabuf_put_le16(p2p_subelems, 0); /* Length to be filled */
 	for (m = group->members; m; m = m->next)
-		p2p_client_info(ie, m);
+		p2p_client_info(p2p_subelems, m);
 	WPA_PUT_LE16(group_info + 1,
-		     (u8 *) wpabuf_put(ie, 0) - group_info - 3);
+		     (u8 *) wpabuf_put(p2p_subelems, 0) - group_info - 3);
 
-	p2p_buf_update_ie_hdr(ie, len);
+	ie = p2p_group_encaps_probe_resp(p2p_subelems);
+	wpabuf_free(p2p_subelems);
 
 	return ie;
 }