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basic.c

/*
 * lib/route/cls/basic.c      Basic Classifier
 *
 *    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) 2008-2009 Thomas Graf <tgraf@suug.ch>
 */

/**
 * @ingroup cls
 * @defgroup basic Basic Classifier
 *
 * @par Introduction
 * The basic classifier is the simplest form of a classifier. It does
 * not have any special classification capabilities, instead it can be
 * used to classify exclusively based on extended matches or to
 * create a "catch-all" filter.
 *
 * @{
 */

#include <netlink-local.h>
#include <netlink-tc.h>
#include <netlink/netlink.h>
#include <netlink/route/classifier.h>
#include <netlink/route/classifier-modules.h>
#include <netlink/route/cls/basic.h>
#include <netlink/route/cls/ematch.h>

00033 struct rtnl_basic
{
      uint32_t                b_classid;
      struct rtnl_ematch_tree *     b_ematch;
      int                     b_mask;
};

/** @cond SKIP */
#define BASIC_ATTR_CLASSID    0x001
#define BASIC_ATTR_EMATCH     0x002
/** @endcond */

00045 static struct nla_policy basic_policy[TCA_FW_MAX+1] = {
      [TCA_BASIC_CLASSID]     = { .type = NLA_U32 },
      [TCA_BASIC_EMATCHES]    = { .type = NLA_NESTED },
      [TCA_BASIC_ACT]         = { .type = NLA_NESTED },
      [TCA_BASIC_POLICE]      = { .type = NLA_NESTED },
};

static int basic_clone(struct rtnl_cls *_dst, struct rtnl_cls *_src)
{
      return -NLE_OPNOTSUPP;
}

static void basic_free_data(struct rtnl_cls *cls)
{
      struct rtnl_basic *basic = rtnl_cls_data(cls);

      rtnl_ematch_tree_free(basic->b_ematch);
}

static int basic_msg_parser(struct rtnl_cls *cls)
{
      struct nlattr *tb[TCA_BASIC_MAX + 1];
      struct rtnl_basic *basic = rtnl_cls_data(cls);
      int err;

      err = tca_parse(tb, TCA_BASIC_MAX, (struct rtnl_tca *) cls, basic_policy);
      if (err < 0)
            return err;

      if (tb[TCA_BASIC_CLASSID]) {
            basic->b_classid = nla_get_u32(tb[TCA_BASIC_CLASSID]);
            basic->b_mask |= BASIC_ATTR_CLASSID;
      }

      if (tb[TCA_BASIC_EMATCHES]) {
            if ((err = rtnl_ematch_parse(tb[TCA_BASIC_EMATCHES],
                                   &basic->b_ematch)) < 0)
                  return err;

            if (basic->b_ematch)
                  basic->b_mask |= BASIC_ATTR_EMATCH;
      }

      if (tb[TCA_BASIC_ACT]) {
            /* XXX */
      }

      if (tb[TCA_BASIC_POLICE]) {
            /* XXX */
      }

      return 0;
}

static void basic_dump_line(struct rtnl_cls *cls, struct nl_dump_params *p)
{
      struct rtnl_basic *b = rtnl_cls_data(cls);
      char buf[32];

      if (b->b_mask & BASIC_ATTR_EMATCH)
            nl_dump(p, " ematch");
      else
            nl_dump(p, " match-all");

      if (b->b_mask & BASIC_ATTR_CLASSID)
            nl_dump(p, " classify-to %s",
                  rtnl_tc_handle2str(b->b_classid, buf, sizeof(buf)));
}

static void basic_dump_details(struct rtnl_cls *cls, struct nl_dump_params *p)
{
      struct rtnl_basic *b = rtnl_cls_data(cls);

      if (b->b_mask & BASIC_ATTR_EMATCH) {
            nl_dump(p, "\n");
            nl_dump_line(p, "    ematch ");
            rtnl_ematch_tree_dump(b->b_ematch, p);
      } else
            nl_dump(p, "no options.\n");
}

static int basic_get_opts(struct rtnl_cls *cls, struct nl_msg *msg)
{
      struct rtnl_basic *b = rtnl_cls_data(cls);

      if (!(b->b_mask & BASIC_ATTR_CLASSID))
            return -NLE_MISSING_ATTR;

      NLA_PUT_U32(msg, TCA_BASIC_CLASSID, b->b_classid);

      return 0;

nla_put_failure:
      return -NLE_NOMEM;
}

/**
 * @name Attribute Modifications
 * @{
 */

int rtnl_basic_set_classid(struct rtnl_cls *cls, uint32_t classid)
{
      struct rtnl_basic *b = rtnl_cls_data(cls);

      b->b_classid = classid;
      b->b_mask |= BASIC_ATTR_CLASSID;

      return 0;
}

uint32_t rtnl_basic_get_classid(struct rtnl_cls *cls)
{
      struct rtnl_basic *b = rtnl_cls_data(cls);

      return b->b_classid;
}

int rtnl_basic_set_ematch(struct rtnl_cls *cls, struct rtnl_ematch_tree *tree)
{
      struct rtnl_basic *b = rtnl_cls_data(cls);

      if (b->b_ematch) {
            rtnl_ematch_tree_free(b->b_ematch);
            b->b_mask &= ~BASIC_ATTR_EMATCH;
      }

      b->b_ematch = tree;

      if (tree)
            b->b_mask |= BASIC_ATTR_EMATCH;

      return 0;
}

struct rtnl_ematch_tree *rtnl_basic_get_ematch(struct rtnl_cls *cls)
{
      struct rtnl_basic *b = rtnl_cls_data(cls);
      return b->b_ematch;
}

/** @} */

static struct rtnl_cls_ops basic_ops = {
      .co_kind          = "basic",
      .co_size          = sizeof(struct rtnl_basic),
      .co_msg_parser          = basic_msg_parser,
      .co_clone         = basic_clone,
      .co_free_data           = basic_free_data,
      .co_get_opts            = basic_get_opts,
      .co_dump = {
          [NL_DUMP_LINE]      = basic_dump_line,
          [NL_DUMP_DETAILS]   = basic_dump_details,
      },
};

static void __init basic_init(void)
{
      rtnl_cls_register(&basic_ops);
}

static void __exit basic_exit(void)
{
      rtnl_cls_unregister(&basic_ops);
}

/** @} */

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