netlabel: Add configuration support for local labeling

Add the necessary NetLabel support for the new CIPSO mapping,
CIPSO_V4_MAP_LOCAL, which allows full LSM label/context support.
Signed-off-by: NPaul Moore <paul.moore@hp.com>
Reviewed-by: NJames Morris <jmorris@namei.org>

include/net/netlabel.h

@@ -72,7 +72,8 @@ struct cipso_v4_doi;
 /* NetLabel NETLINK protocol version
  *  1: initial version
  *  2: added static labels for unlabeled connections
- *  3: network selectors added to the NetLabel/LSM domain mapping
+ *  3: network selectors added to the NetLabel/LSM domain mapping and the
+ *     CIPSO_V4_MAP_LOCAL CIPSO mapping was added
  */
 #define NETLBL_PROTO_VERSION            3
 

net/netlabel/netlabel_cipso_v4.c

@@ -364,6 +364,43 @@ static int netlbl_cipsov4_add_pass(struct genl_info *info)
 	return ret_val;
 }
 
+/**
+ * netlbl_cipsov4_add_local - Adds a CIPSO V4 DOI definition
+ * @info: the Generic NETLINK info block
+ *
+ * Description:
+ * Create a new CIPSO_V4_MAP_LOCAL DOI definition based on the given ADD
+ * message and add it to the CIPSO V4 engine.  Return zero on success and
+ * non-zero on error.
+ *
+ */
+static int netlbl_cipsov4_add_local(struct genl_info *info)
+{
+	int ret_val;
+	struct cipso_v4_doi *doi_def = NULL;
+
+	if (!info->attrs[NLBL_CIPSOV4_A_TAGLST])
+		return -EINVAL;
+
+	doi_def = kmalloc(sizeof(*doi_def), GFP_KERNEL);
+	if (doi_def == NULL)
+		return -ENOMEM;
+	doi_def->type = CIPSO_V4_MAP_LOCAL;
+
+	ret_val = netlbl_cipsov4_add_common(info, doi_def);
+	if (ret_val != 0)
+		goto add_local_failure;
+
+	ret_val = cipso_v4_doi_add(doi_def);
+	if (ret_val != 0)
+		goto add_local_failure;
+	return 0;
+
+add_local_failure:
+	cipso_v4_doi_free(doi_def);
+	return ret_val;
+}
+
 /**
  * netlbl_cipsov4_add - Handle an ADD message
  * @skb: the NETLINK buffer
@@ -401,6 +438,10 @@ static int netlbl_cipsov4_add(struct sk_buff *skb, struct genl_info *info)
 		type_str = "pass";
 		ret_val = netlbl_cipsov4_add_pass(info);
 		break;
+	case CIPSO_V4_MAP_LOCAL:
+		type_str = "local";
+		ret_val = netlbl_cipsov4_add_local(info);
+		break;
 	}
 	if (ret_val == 0)
 		atomic_inc(&netlabel_mgmt_protocount);

net/netlabel/netlabel_cipso_v4.h

@@ -50,7 +50,8 @@
  *     NLBL_CIPSOV4_A_MLSLVLLST
  *     NLBL_CIPSOV4_A_MLSCATLST
  *
- *   If using CIPSO_V4_MAP_PASS no additional attributes are required.
+ *   If using CIPSO_V4_MAP_PASS or CIPSO_V4_MAP_LOCAL no additional attributes
+ *   are required.
  *
  * o REMOVE:
  *   Sent by an application to remove a specific DOI mapping table from the
@@ -81,7 +82,8 @@
  *     NLBL_CIPSOV4_A_MLSLVLLST
  *     NLBL_CIPSOV4_A_MLSCATLST
  *
- *   If using CIPSO_V4_MAP_PASS no additional attributes are required.
+ *   If using CIPSO_V4_MAP_PASS or CIPSO_V4_MAP_LOCAL no additional attributes
+ *   are required.
  *
  * o LISTALL:
  *   This message is sent by an application to list the valid DOIs on the

net/netlabel/netlabel_kapi.c

@@ -163,6 +163,9 @@ int netlbl_cfg_cipsov4_add_map(struct cipso_v4_doi *doi_def,
 		case CIPSO_V4_MAP_PASS:
 			type_str = "pass";
 			break;
+		case CIPSO_V4_MAP_LOCAL:
+			type_str = "local";
+			break;
 		default:
 			type_str = "(unknown)";
 		}