Function ng_name_node

freebsd/netgraph/ng_base.c:851–896

* Assign a node a name. */

 * Assign a node a name.
 */
int
ng_name_node(node_p node, const char *name)
{
	uint32_t hash;
	node_p node2;
	int i;

	/* Check the name is valid */
	for (i = 0; i < NG_NODESIZ; i++) {
		if (name[i] == '\0' || name[i] == '.' || name[i] == ':')
			break;
	}
	if (i == 0 || name[i] != '\0') {
		TRAP_ERROR();
		return (EINVAL);
	}
	if (ng_decodeidname(name) != 0) { /* valid IDs not allowed here */
		TRAP_ERROR();
		return (EINVAL);
	}

	NAMEHASH_WLOCK();
	if (V_ng_named_nodes * 2 > V_ng_name_hmask)
		ng_name_rehash();

	hash = hash32_str(name, HASHINIT) & V_ng_name_hmask;
	/* Check the name isn't already being used. */
	LIST_FOREACH(node2, &V_ng_name_hash[hash], nd_nodes)
		if (NG_NODE_IS_VALID(node2) &&
		    (strcmp(NG_NODE_NAME(node2), name) == 0)) {
			NAMEHASH_WUNLOCK();
			return (EADDRINUSE);
		}

	if (NG_NODE_HAS_NAME(node))
		LIST_REMOVE(node, nd_nodes);
	else
		V_ng_named_nodes++;
	/* Copy it. */
	strlcpy(NG_NODE_NAME(node), name, NG_NODESIZ);
	/* Update name hash. */
	LIST_INSERT_HEAD(&V_ng_name_hash[hash], node, nd_nodes);
	NAMEHASH_WUNLOCK();

	return (0);
}

/*
 * Find a node by absolute name. The name should NOT end with ':'