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dsmark.c

/*
 * lib/route/sch/dsmark.c     DSMARK
 *
 *    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 qdisc
 * @ingroup class
 * @defgroup dsmark Differentiated Services Marker (DSMARK)
 * @{
 */

#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/class.h>
#include <netlink/route/class-modules.h>
#include <netlink/route/sch/dsmark.h>

/** @cond SKIP */
#define SCH_DSMARK_ATTR_INDICES           0x1
#define SCH_DSMARK_ATTR_DEFAULT_INDEX     0x2
#define SCH_DSMARK_ATTR_SET_TC_INDEX      0x4

#define SCH_DSMARK_ATTR_MASK        0x1
#define SCH_DSMARK_ATTR_VALUE       0x2
/** @endcond */

00038 static inline struct rtnl_dsmark_qdisc *dsmark_qdisc(struct rtnl_qdisc *qdisc)
{
      return (struct rtnl_dsmark_qdisc *) qdisc->q_subdata;
}

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

      return dsmark_qdisc(qdisc);
}

static struct nla_policy dsmark_policy[TCA_DSMARK_MAX+1] = {
      [TCA_DSMARK_INDICES]          = { .type = NLA_U16 },
      [TCA_DSMARK_DEFAULT_INDEX]    = { .type = NLA_U16 },
      [TCA_DSMARK_SET_TC_INDEX]     = { .type = NLA_FLAG },
      [TCA_DSMARK_VALUE]            = { .type = NLA_U8 },
      [TCA_DSMARK_MASK]       = { .type = NLA_U8 },
};

static int dsmark_qdisc_msg_parser(struct rtnl_qdisc *qdisc)
{
      int err;
      struct nlattr *tb[TCA_DSMARK_MAX + 1];
      struct rtnl_dsmark_qdisc *dsmark;

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

      dsmark = dsmark_qdisc_alloc(qdisc);
      if (!dsmark)
            return nl_errno(ENOMEM);

      if (tb[TCA_DSMARK_INDICES]) {
            dsmark->qdm_indices = nla_get_u16(tb[TCA_DSMARK_INDICES]);
            dsmark->qdm_mask |= SCH_DSMARK_ATTR_INDICES;
      }

      if (tb[TCA_DSMARK_DEFAULT_INDEX]) {
            dsmark->qdm_default_index =
                        nla_get_u16(tb[TCA_DSMARK_DEFAULT_INDEX]);
            dsmark->qdm_mask |= SCH_DSMARK_ATTR_DEFAULT_INDEX;
      }

      if (tb[TCA_DSMARK_SET_TC_INDEX]) {
            dsmark->qdm_set_tc_index = 1;
            dsmark->qdm_mask |= SCH_DSMARK_ATTR_SET_TC_INDEX;
      }

      return 0;
}

static inline struct rtnl_dsmark_class *dsmark_class(struct rtnl_class *class)
{
      return (struct rtnl_dsmark_class *) class->c_subdata;
}

static inline struct rtnl_dsmark_class *
dsmark_class_alloc(struct rtnl_class *class)
{
      if (!class->c_subdata)
            class->c_subdata = calloc(1, sizeof(struct rtnl_dsmark_class));

      return dsmark_class(class);
}

static int dsmark_class_msg_parser(struct rtnl_class *class)
{
      int err;
      struct nlattr *tb[TCA_DSMARK_MAX + 1];
      struct rtnl_dsmark_class *dsmark;

      err = tca_parse(tb, TCA_DSMARK_MAX, (struct rtnl_tca *) class,
                  dsmark_policy);
      if (err < 0)
            return err;

      dsmark = dsmark_class_alloc(class);
      if (!dsmark)
            return nl_errno(ENOMEM);

      if (tb[TCA_DSMARK_MASK]) {
            dsmark->cdm_bmask = nla_get_u8(tb[TCA_DSMARK_MASK]);
            dsmark->cdm_mask |= SCH_DSMARK_ATTR_MASK;
      }

      if (tb[TCA_DSMARK_VALUE]) {
            dsmark->cdm_value = nla_get_u8(tb[TCA_DSMARK_VALUE]);
            dsmark->cdm_mask |= SCH_DSMARK_ATTR_VALUE;
      }

      return 0;
}

static int dsmark_qdisc_dump_brief(struct rtnl_qdisc *qdisc,
                           struct nl_dump_params *p, int line)
{
      struct rtnl_dsmark_qdisc *dsmark = dsmark_qdisc(qdisc);

      if (dsmark && (dsmark->qdm_mask & SCH_DSMARK_ATTR_INDICES))
            dp_dump(p, " indices 0x%04x", dsmark->qdm_indices);

      return line;
}

static int dsmark_qdisc_dump_full(struct rtnl_qdisc *qdisc,
                          struct nl_dump_params *p, int line)
{
      struct rtnl_dsmark_qdisc *dsmark = dsmark_qdisc(qdisc);

      if (!dsmark)
            goto ignore;

      if (dsmark->qdm_mask & SCH_DSMARK_ATTR_DEFAULT_INDEX)
            dp_dump(p, " default index 0x%04x", dsmark->qdm_default_index);

      if (dsmark->qdm_mask & SCH_DSMARK_ATTR_SET_TC_INDEX)
            dp_dump(p, " set-tc-index");

ignore:
      return line;
}

static int dsmark_class_dump_brief(struct rtnl_class *class,
                           struct nl_dump_params *p, int line)
{
      struct rtnl_dsmark_class *dsmark = dsmark_class(class);

      if (!dsmark)
            goto ignore;

      if (dsmark->cdm_mask & SCH_DSMARK_ATTR_VALUE)
            dp_dump(p, " value 0x%02x", dsmark->cdm_value);

      if (dsmark->cdm_mask & SCH_DSMARK_ATTR_MASK)
            dp_dump(p, " mask 0x%02x", dsmark->cdm_bmask);

ignore:
      return line;
}

static struct nl_msg *dsmark_qdisc_get_opts(struct rtnl_qdisc *qdisc)
{
      struct rtnl_dsmark_qdisc *dsmark = dsmark_qdisc(qdisc);
      struct nl_msg *msg;

      if (!dsmark)
            return NULL;

      msg = nlmsg_build_no_hdr();
      if (!msg)
            goto nla_put_failure;

      if (dsmark->qdm_mask & SCH_DSMARK_ATTR_INDICES)
            NLA_PUT_U16(msg, TCA_DSMARK_INDICES, dsmark->qdm_indices);

      if (dsmark->qdm_mask & SCH_DSMARK_ATTR_DEFAULT_INDEX)
            NLA_PUT_U16(msg, TCA_DSMARK_DEFAULT_INDEX,
                      dsmark->qdm_default_index);

      if (dsmark->qdm_mask & SCH_DSMARK_ATTR_SET_TC_INDEX)
            NLA_PUT_FLAG(msg, TCA_DSMARK_SET_TC_INDEX);

      return msg;

nla_put_failure:
      nlmsg_free(msg);
      return NULL;
}

static struct nl_msg *dsmark_class_get_opts(struct rtnl_class *class)
{
      struct rtnl_dsmark_class *dsmark = dsmark_class(class);
      struct nl_msg *msg;

      if (!dsmark)
            return NULL;

      msg = nlmsg_build_no_hdr();
      if (!msg)
            goto nla_put_failure;

      if (dsmark->cdm_mask & SCH_DSMARK_ATTR_MASK)
            NLA_PUT_U8(msg, TCA_DSMARK_MASK, dsmark->cdm_bmask);

      if (dsmark->cdm_mask & SCH_DSMARK_ATTR_VALUE)
            NLA_PUT_U8(msg, TCA_DSMARK_VALUE, dsmark->cdm_value);

      return msg;

nla_put_failure:
      nlmsg_free(msg);
      return NULL;
}

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

/**
 * Set bitmask of DSMARK class.
 * @arg class           DSMARK class to be modified.
 * @arg mask            New bitmask.
 * @return 0 on success or a negative error code.
 */
00248 int rtnl_class_dsmark_set_bitmask(struct rtnl_class *class, uint8_t mask)
{
      struct rtnl_dsmark_class *dsmark;
      
      dsmark = dsmark_class(class);
      if (!dsmark)
            return nl_errno(ENOMEM);

      dsmark->cdm_bmask = mask;
      dsmark->cdm_mask |= SCH_DSMARK_ATTR_MASK;

      return 0;
}

/**
 * Get bitmask of DSMARK class.
 * @arg class           DSMARK class.
 * @return Bitmask or a negative error code.
 */
00267 int rtnl_class_dsmark_get_bitmask(struct rtnl_class *class)
{
      struct rtnl_dsmark_class *dsmark;

      dsmark = dsmark_class(class);
      if (dsmark && dsmark->cdm_mask & SCH_DSMARK_ATTR_MASK)
            return dsmark->cdm_bmask;
      else
            return nl_errno(ENOENT);
}

/**
 * Set value of DSMARK class.
 * @arg class           DSMARK class to be modified.
 * @arg value           New value.
 * @return 0 on success or a negative errror code.
 */
00284 int rtnl_class_dsmark_set_value(struct rtnl_class *class, uint8_t value)
{
      struct rtnl_dsmark_class *dsmark;

      dsmark = dsmark_class(class);
      if (!dsmark)
            return nl_errno(ENOMEM);

      dsmark->cdm_value = value;
      dsmark->cdm_mask |= SCH_DSMARK_ATTR_VALUE;

      return 0;
}

/**
 * Get value of DSMARK class.
 * @arg class           DSMARK class.
 * @return Value or a negative error code.
 */
00303 int rtnl_class_dsmark_get_value(struct rtnl_class *class)
{
      struct rtnl_dsmark_class *dsmark;

      dsmark = dsmark_class(class);
      if (dsmark && dsmark->cdm_mask & SCH_DSMARK_ATTR_VALUE)
            return dsmark->cdm_value;
      else
            return nl_errno(ENOENT);
}

/** @} */

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

/**
 * Set indices of DSMARK qdisc.
 * @arg qdisc           DSMARK qdisc to be modified.
 * @arg indices         New indices.
 */
00326 int rtnl_qdisc_dsmark_set_indices(struct rtnl_qdisc *qdisc, uint16_t indices)
{
      struct rtnl_dsmark_qdisc *dsmark;

      dsmark = dsmark_qdisc(qdisc);
      if (!dsmark)
            return nl_errno(ENOMEM);

      dsmark->qdm_indices = indices;
      dsmark->qdm_mask |= SCH_DSMARK_ATTR_INDICES;

      return 0;
}

/**
 * Get indices of DSMARK qdisc.
 * @arg qdisc           DSMARK qdisc.
 * @return Indices or a negative error code.
 */
00345 int rtnl_qdisc_dsmark_get_indices(struct rtnl_qdisc *qdisc)
{
      struct rtnl_dsmark_qdisc *dsmark;

      dsmark = dsmark_qdisc(qdisc);
      if (dsmark && dsmark->qdm_mask & SCH_DSMARK_ATTR_INDICES)
            return dsmark->qdm_indices;
      else
            return nl_errno(ENOENT);
}

/**
 * Set default index of DSMARK qdisc.
 * @arg qdisc           DSMARK qdisc to be modified.
 * @arg default_index   New default index.
 * @return 0 on success or a negative error code.
 */
00362 int rtnl_qdisc_dsmark_set_default_index(struct rtnl_qdisc *qdisc,
                              uint16_t default_index)
{
      struct rtnl_dsmark_qdisc *dsmark;

      dsmark = dsmark_qdisc(qdisc);
      if (!dsmark)
            return nl_errno(ENOMEM);

      dsmark->qdm_default_index = default_index;
      dsmark->qdm_mask |= SCH_DSMARK_ATTR_DEFAULT_INDEX;

      return 0;
}

/**
 * Get default index of DSMARK qdisc.
 * @arg qdisc           DSMARK qdisc.
 * @return Default index or a negative error code.
 */
00382 int rtnl_qdisc_dsmark_get_default_index(struct rtnl_qdisc *qdisc)
{
      struct rtnl_dsmark_qdisc *dsmark;

      dsmark = dsmark_qdisc(qdisc);
      if (dsmark && dsmark->qdm_mask & SCH_DSMARK_ATTR_DEFAULT_INDEX)
            return dsmark->qdm_default_index;
      else
            return nl_errno(ENOENT);
}

/**
 * Set set-tc-index flag of DSMARK qdisc.
 * @arg qdisc           DSMARK qdisc to be modified.
 * @arg flag            Flag indicating whether to enable or disable.
 * @return 0 on success or a negative error code.
 */
00399 int rtnl_qdisc_dsmark_set_set_tc_index(struct rtnl_qdisc *qdisc, int flag)
{
      struct rtnl_dsmark_qdisc *dsmark;

      dsmark = dsmark_qdisc(qdisc);
      if (!dsmark)
            return nl_errno(ENOMEM);

      dsmark->qdm_set_tc_index = !!flag;
      dsmark->qdm_mask |= SCH_DSMARK_ATTR_SET_TC_INDEX;

      return 0;
}

/**
 * Get set-tc-index flag of DSMARK qdisc.
 * @arg qdisc           DSMARK qdisc to be modified.
 * @return 1 or 0 to indicate wehther the flag is enabled or a negative
 *         error code.
 */
00419 int rtnl_qdisc_dsmark_get_set_tc_index(struct rtnl_qdisc *qdisc)
{
      struct rtnl_dsmark_qdisc *dsmark;

      dsmark = dsmark_qdisc(qdisc);
      if (dsmark && dsmark->qdm_mask & SCH_DSMARK_ATTR_SET_TC_INDEX)
            return dsmark->qdm_set_tc_index;
      else
            return nl_errno(ENOENT);
}

/** @} */

static struct rtnl_qdisc_ops dsmark_qdisc_ops = {
      .qo_kind          = "dsmark",
      .qo_msg_parser          = dsmark_qdisc_msg_parser,
      .qo_dump[NL_DUMP_BRIEF] = dsmark_qdisc_dump_brief,
      .qo_dump[NL_DUMP_FULL]  = dsmark_qdisc_dump_full,
      .qo_get_opts            = dsmark_qdisc_get_opts,
};

static struct rtnl_class_ops dsmark_class_ops = {
      .co_kind          = "dsmark",
      .co_msg_parser          = dsmark_class_msg_parser,
      .co_dump[NL_DUMP_BRIEF] = dsmark_class_dump_brief,
      .co_get_opts            = dsmark_class_get_opts,
};

static void __init dsmark_init(void)
{
      rtnl_qdisc_register(&dsmark_qdisc_ops);
      rtnl_class_register(&dsmark_class_ops);
}

static void __exit dsmark_exit(void)
{
      rtnl_qdisc_unregister(&dsmark_qdisc_ops);
      rtnl_class_unregister(&dsmark_class_ops);
}

/** @} */

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