iscsi-target: Implement demo_mode_discovery logic

If demo_mode_discovery=0 and generate_node_acls=0 (demo mode dislabed) do
not return TargetName+TargetAddress unless a NodeACL exists.
Signed-off-by: Thomas Glanzmann <thomas@glanzmann.de>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

drivers/target/iscsi/iscsi_target.c

@@ -3369,6 +3369,7 @@ static int iscsit_build_sendtargets_response(struct iscsi_cmd *cmd)
 	struct iscsi_tiqn *tiqn;
 	struct iscsi_tpg_np *tpg_np;
 	int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
+	int target_name_printed;
 	unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */
 	unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL;
 
@@ -3406,19 +3407,23 @@ static int iscsit_build_sendtargets_response(struct iscsi_cmd *cmd)
 			continue;
 		}
 
-		len = sprintf(buf, "TargetName=%s", tiqn->tiqn);
-		len += 1;
-
-		if ((len + payload_len) > buffer_len) {
-			end_of_buf = 1;
-			goto eob;
-		}
-		memcpy(payload + payload_len, buf, len);
-		payload_len += len;
+		target_name_printed = 0;
 
 		spin_lock(&tiqn->tiqn_tpg_lock);
 		list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
 
+			/* If demo_mode_discovery=0 and generate_node_acls=0
+			 * (demo mode dislabed) do not return
+			 * TargetName+TargetAddress unless a NodeACL exists.
+			 */
+
+			if ((tpg->tpg_attrib.generate_node_acls == 0) &&
+			    (tpg->tpg_attrib.demo_mode_discovery == 0) &&
+			    (!core_tpg_get_initiator_node_acl(&tpg->tpg_se_tpg,
+				cmd->conn->sess->sess_ops->InitiatorName))) {
+				continue;
+			}
+
 			spin_lock(&tpg->tpg_state_lock);
 			if ((tpg->tpg_state == TPG_STATE_FREE) ||
 			    (tpg->tpg_state == TPG_STATE_INACTIVE)) {
@@ -3433,6 +3438,22 @@ static int iscsit_build_sendtargets_response(struct iscsi_cmd *cmd)
 				struct iscsi_np *np = tpg_np->tpg_np;
 				bool inaddr_any = iscsit_check_inaddr_any(np);
 
+				if (!target_name_printed) {
+					len = sprintf(buf, "TargetName=%s",
+						      tiqn->tiqn);
+					len += 1;
+
+					if ((len + payload_len) > buffer_len) {
+						spin_unlock(&tpg->tpg_np_lock);
+						spin_unlock(&tiqn->tiqn_tpg_lock);
+						end_of_buf = 1;
+						goto eob;
+					}
+					memcpy(payload + payload_len, buf, len);
+					payload_len += len;
+					target_name_printed = 1;
+				}
+
 				len = sprintf(buf, "TargetAddress="
 					"%s:%hu,%hu",
 					(inaddr_any == false) ?