class_api.c

/*
 * lib/route/class_api.c            Queueing Classes Module API
 *
 *      This library is free software; you can redistribute it and/or
 *      modify it under the terms of the GNU Lesser General Public
 *      License as published by the Free Software Foundation version 2.1
 *      of the License.
 *
 * Copyright (c) 2003-2006 Thomas Graf <tgraf@suug.ch>
 */

/**
 * @ingroup class
 * @defgroup class_api Class Modules
 * @{
 */

#include <netlink-local.h>
#include <netlink-tc.h>
#include <netlink/netlink.h>
#include <netlink/route/tc.h>
#include <netlink/route/class.h>
#include <netlink/route/class-modules.h>
#include <netlink/utils.h>

static struct rtnl_class_ops *class_ops_list;

/**
 * @name Module API
 * @{
 */

/**
 * Register a class module
 * @arg cops            class module operations
 */
int rtnl_class_register(struct rtnl_class_ops *cops)
{
        struct rtnl_class_ops *o, **op;

        if (!cops->co_kind[0])
                BUG();

        for (op = &class_ops_list; (o = *op) != NULL; op = &o->co_next)
                if (!strcasecmp(cops->co_kind, o->co_kind))
                        return nl_errno(EEXIST);

        cops->co_next = NULL;
        *op = cops;

        return 0;
}

/**
 * Unregister a class module
 * @arg cops            class module operations
 */
int rtnl_class_unregister(struct rtnl_class_ops *cops)
{
        struct rtnl_class_ops *o, **op;

        for (op = &class_ops_list; (o = *op) != NULL; op = &o->co_next)
                if (!strcasecmp(cops->co_kind, o->co_kind))
                        break;

        if (!o)
                return nl_errno(ENOENT);

        *op = cops->co_next;

        return 0;
}

struct rtnl_class_ops *__rtnl_class_lookup_ops(const char *kind)
{
        struct rtnl_class_ops *cops;

        for (cops = class_ops_list; cops; cops = cops->co_next)
                if (!strcmp(kind, cops->co_kind))
                        return cops;

        return NULL;
}

/**
 * Lookup class operations for a class object
 * @arg class           Class object.
 *
 * @return Class operations or NULL if not found.
 */
struct rtnl_class_ops *rtnl_class_lookup_ops(struct rtnl_class *class)
{
        if (!class->c_ops)
                class->c_ops = __rtnl_class_lookup_ops(class->c_kind);

        return class->c_ops;
}


/** @} */

/** @} */