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red.c

/*
 * lib/route/sch/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) 2003-2008 Thomas Graf <tgraf@suug.ch>
 */

/**
 * @ingroup qdisc_api
 * @defgroup red Random Early Detection (RED)
 * @brief
 * @{
 */

#include <netlink-local.h>
#include <netlink-tc.h>
#include <netlink/netlink.h>
#include <netlink/utils.h>
#include <netlink/route/qdisc.h>
#include <netlink/route/qdisc-modules.h>
#include <netlink/route/sch/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 */

00037 static inline struct rtnl_red *red_qdisc(struct rtnl_qdisc *qdisc)
{
      return (struct rtnl_red *) qdisc->q_subdata;
}

static inline struct rtnl_red *red_alloc(struct rtnl_qdisc *qdisc)
{
      if (!qdisc->q_subdata)
            qdisc->q_subdata = calloc(1, sizeof(struct rtnl_red));

      return red_qdisc(qdisc);
}

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_qdisc *qdisc)
{
      struct nlattr *tb[TCA_RED_MAX+1];
      struct rtnl_red *red;
      struct tc_red_qopt *opts;
      int err;

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

      err = tca_parse(tb, TCA_RED_MAX, (struct rtnl_tca *) qdisc, red_policy);
      if (err < 0)
            return err;

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

      red = red_alloc(qdisc);
      if (!red)
            return -NLE_NOMEM;

      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_qdisc *qdisc, struct nl_dump_params *p)
{
      struct rtnl_red *red = red_qdisc(qdisc);

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

static void red_dump_details(struct rtnl_qdisc *qdisc, struct nl_dump_params *p)
{
      struct rtnl_red *red = red_qdisc(qdisc);

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

static void red_dump_stats(struct rtnl_qdisc *qdisc, struct nl_dump_params *p)
{
      struct rtnl_red *red = red_qdisc(qdisc);

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

static struct nl_msg *red_get_opts(struct rtnl_qdisc *qdisc)
{
      struct rtnl_red *red;
      struct nl_msg *msg;

      red = red_qdisc(qdisc);
      if (!red)
            return NULL;

      msg = nlmsg_alloc();
      if (!msg)
            goto errout;

#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 msg;
errout:
      nlmsg_free(msg);
      return NULL;
}

/**
 * @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.
 */
00159 int rtnl_red_set_limit(struct rtnl_qdisc *qdisc, int limit)
{
      struct rtnl_red *red;

      red = red_alloc(qdisc);
      if (!red)
            return -NLE_NOMEM;

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

      return 0;
}

/**
 * Get limit of RED qdisc.
 * @arg qdisc           RED qdisc.
 * @return Limit or a negative error code.
 */
00178 int rtnl_red_get_limit(struct rtnl_qdisc *qdisc)
{
      struct rtnl_red *red;

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

/** @} */

static struct rtnl_qdisc_ops red_ops = {
      .qo_kind          = "red",
      .qo_msg_parser          = red_msg_parser,
      .qo_dump = {
          [NL_DUMP_LINE]      = red_dump_line,
          [NL_DUMP_DETAILS]   = red_dump_details,
          [NL_DUMP_STATS]     = red_dump_stats,
      },
      .qo_get_opts            = red_get_opts,
};

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

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

/** @} */

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