red.c

/*
 * lib/route/qdisc/red.c                RED Qdisc
 *
 *      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) 2003-2011 Thomas Graf <tgraf@suug.ch>
 */

/**
 * @ingroup qdisc
 * @defgroup qdisc_red Random Early Detection (RED)
 * @brief
 * @{
 */

#include <netlink-private/netlink.h>
#include <netlink-private/tc.h>
#include <netlink/netlink.h>
#include <netlink/utils.h>
#include <netlink-private/route/tc-api.h>
#include <netlink/route/qdisc.h>
#include <netlink/route/qdisc/red.h>

/** @cond SKIP */
#define RED_ATTR_LIMIT          0x01
#define RED_ATTR_QTH_MIN        0x02
#define RED_ATTR_QTH_MAX        0x04
#define RED_ATTR_FLAGS          0x08
#define RED_ATTR_WLOG           0x10
#define RED_ATTR_PLOG           0x20
#define RED_ATTR_SCELL_LOG      0x40
/** @endcond */

static struct nla_policy red_policy[TCA_RED_MAX+1] = {
        [TCA_RED_PARMS]         = { .minlen = sizeof(struct tc_red_qopt) },
};

static int red_msg_parser(struct rtnl_tc *tc, void *data)
{
        struct nlattr *tb[TCA_RED_MAX+1];
        struct rtnl_red *red = data;
        struct tc_red_qopt *opts;
        int err;

        if (!(tc->ce_mask & TCA_ATTR_OPTS))
                return 0;

        err = tca_parse(tb, TCA_RED_MAX, tc, red_policy);
        if (err < 0)
                return err;

        if (!tb[TCA_RED_PARMS])
                return -NLE_MISSING_ATTR;

        opts = nla_data(tb[TCA_RED_PARMS]);

        red->qr_limit = opts->limit;
        red->qr_qth_min = opts->qth_min;
        red->qr_qth_max = opts->qth_max;
        red->qr_flags = opts->flags;
        red->qr_wlog = opts->Wlog;
        red->qr_plog = opts->Plog;
        red->qr_scell_log = opts->Scell_log;

        red->qr_mask = (RED_ATTR_LIMIT | RED_ATTR_QTH_MIN | RED_ATTR_QTH_MAX |
                        RED_ATTR_FLAGS | RED_ATTR_WLOG | RED_ATTR_PLOG |
                        RED_ATTR_SCELL_LOG);

        return 0;
}

static void red_dump_line(struct rtnl_tc *tc, void *data,
                          struct nl_dump_params *p)
{
        struct rtnl_red *red = data;

        if (red) {
                /* XXX: limit, min, max, flags */
        }
}

static void red_dump_details(struct rtnl_tc *tc, void *data,
                             struct nl_dump_params *p)
{
        struct rtnl_red *red = data;

        if (red) {
                /* XXX: wlog, plog, scell_log */
        }
}

static void red_dump_stats(struct rtnl_tc *tc, void *data,
                           struct nl_dump_params *p)
{
        struct rtnl_red *red = data;

        if (red) {
                /* XXX: xstats */
        }
}

static int red_msg_fill(struct rtnl_tc *tc, void *data, struct nl_msg *msg)
{
        struct rtnl_red *red = data;

        if (!red)
                BUG();

#if 0
        memset(&opts, 0, sizeof(opts));
        opts.quantum = sfq->qs_quantum;
        opts.perturb_period = sfq->qs_perturb;
        opts.limit = sfq->qs_limit;

        if (nlmsg_append(msg, &opts, sizeof(opts), NL_DONTPAD) < 0)
                goto errout;
#endif

        return -NLE_OPNOTSUPP;
}

/**
 * @name Attribute Access
 * @{
 */

/**
 * Set limit of RED qdisc.
 * @arg qdisc           RED qdisc to be modified.
 * @arg limit           New limit in number of packets.
 * @return 0 on success or a negative error code.
 */
void rtnl_red_set_limit(struct rtnl_qdisc *qdisc, int limit)
{
        struct rtnl_red *red;

        if (!(red = rtnl_tc_data(TC_CAST(qdisc))))
                BUG();

        red->qr_limit = limit;
        red->qr_mask |= RED_ATTR_LIMIT;
}

/**
 * Get limit of RED qdisc.
 * @arg qdisc           RED qdisc.
 * @return Limit or a negative error code.
 */
int rtnl_red_get_limit(struct rtnl_qdisc *qdisc)
{
        struct rtnl_red *red;

        if (!(red = rtnl_tc_data(TC_CAST(qdisc))))
                BUG();

        if (red->qr_mask & RED_ATTR_LIMIT)
                return red->qr_limit;
        else
                return -NLE_NOATTR;
}

/** @} */

static struct rtnl_tc_ops red_ops = {
        .to_kind                = "red",
        .to_type                = RTNL_TC_TYPE_QDISC,
        .to_size                = sizeof(struct rtnl_red),
        .to_msg_parser          = red_msg_parser,
        .to_dump = {
            [NL_DUMP_LINE]      = red_dump_line,
            [NL_DUMP_DETAILS]   = red_dump_details,
            [NL_DUMP_STATS]     = red_dump_stats,
        },
        .to_msg_fill            = red_msg_fill,
};

static void __init red_init(void)
{
        rtnl_tc_register(&red_ops);
}

static void __exit red_exit(void)
{
        rtnl_tc_unregister(&red_ops);
}

/** @} */