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fw.c

/*
 * lib/route/cls/fw.c         fw 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) 2003-2009 Thomas Graf <tgraf@suug.ch>
 * Copyright (c) 2006 Petr Gotthard <petr.gotthard@siemens.com>
 * Copyright (c) 2006 Siemens AG Oesterreich
 */

/**
 * @ingroup cls_api
 * @defgroup fw Firewall Classifier
 *
 * @{
 */

#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/fw.h>

/** @cond SKIP */
#define FW_ATTR_CLASSID      0x001
#define FW_ATTR_ACTION       0x002
#define FW_ATTR_POLICE       0x004
#define FW_ATTR_INDEV        0x008
/** @endcond */

00035 static struct nla_policy fw_policy[TCA_FW_MAX+1] = {
      [TCA_FW_CLASSID]  = { .type = NLA_U32 },
      [TCA_FW_INDEV]          = { .type = NLA_STRING,
                            .maxlen = IFNAMSIZ },
};

static int fw_msg_parser(struct rtnl_cls *cls)
{
      struct rtnl_fw *f = rtnl_cls_data(cls);
      struct nlattr *tb[TCA_FW_MAX + 1];
      int err;

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

      if (tb[TCA_FW_CLASSID]) {
            f->cf_classid = nla_get_u32(tb[TCA_FW_CLASSID]);
            f->cf_mask |= FW_ATTR_CLASSID;
      }

      if (tb[TCA_FW_ACT]) {
            f->cf_act = nl_data_alloc_attr(tb[TCA_FW_ACT]);
            if (!f->cf_act)
                  return -NLE_NOMEM;
            f->cf_mask |= FW_ATTR_ACTION;
      }

      if (tb[TCA_FW_POLICE]) {
            f->cf_police = nl_data_alloc_attr(tb[TCA_FW_POLICE]);
            if (!f->cf_police)
                  return -NLE_NOMEM;
            f->cf_mask |= FW_ATTR_POLICE;
      }

      if (tb[TCA_FW_INDEV]) {
            nla_strlcpy(f->cf_indev, tb[TCA_FW_INDEV], IFNAMSIZ);
            f->cf_mask |= FW_ATTR_INDEV;
      }

      return 0;
}

static void fw_free_data(struct rtnl_cls *cls)
{
      struct rtnl_fw *f = rtnl_cls_data(cls);

      nl_data_free(f->cf_act);
      nl_data_free(f->cf_police);
}

static int fw_clone(struct rtnl_cls *_dst, struct rtnl_cls *_src)
{
      struct rtnl_fw *dst = rtnl_cls_data(_dst);
      struct rtnl_fw *src = rtnl_cls_data(_src);

      if (src->cf_act && !(dst->cf_act = nl_data_clone(src->cf_act)))
            return -NLE_NOMEM;
      
      if (src->cf_police && !(dst->cf_police = nl_data_clone(src->cf_police)))
            return -NLE_NOMEM;

      return 0;
}

static void fw_dump_line(struct rtnl_cls *cls, struct nl_dump_params *p)
{
      struct rtnl_fw *f = rtnl_cls_data(cls);
      char buf[32];

      if (f->cf_mask & FW_ATTR_CLASSID)
            nl_dump(p, " target %s",
                  rtnl_tc_handle2str(f->cf_classid, buf, sizeof(buf)));
}

static void fw_dump_details(struct rtnl_cls *cls, struct nl_dump_params *p)
{
      struct rtnl_fw *f = rtnl_cls_data(cls);

      if (f->cf_mask & FW_ATTR_INDEV)
            nl_dump(p, "indev %s ", f->cf_indev);
}

static int fw_get_opts(struct rtnl_cls *cls, struct nl_msg *msg)
{
      struct rtnl_fw *f = rtnl_cls_data(cls);
      
      if (f->cf_mask & FW_ATTR_CLASSID)
            NLA_PUT_U32(msg, TCA_FW_CLASSID, f->cf_classid);

      if (f->cf_mask & FW_ATTR_ACTION)
            NLA_PUT_DATA(msg, TCA_FW_ACT, f->cf_act);

      if (f->cf_mask & FW_ATTR_POLICE)
            NLA_PUT_DATA(msg, TCA_FW_POLICE, f->cf_police);

      if (f->cf_mask & FW_ATTR_INDEV)
            NLA_PUT_STRING(msg, TCA_FW_INDEV, f->cf_indev);

      return 0;

nla_put_failure:
      return -NLE_NOMEM;
}

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

int rtnl_fw_set_classid(struct rtnl_cls *cls, uint32_t classid)
{
      struct rtnl_fw *f = rtnl_cls_data(cls);
      
      f->cf_classid = classid;
      f->cf_mask |= FW_ATTR_CLASSID;

      return 0;
}

/** @} */

static struct rtnl_cls_ops fw_ops = {
      .co_kind          = "fw",
      .co_size          = sizeof(struct rtnl_fw),
      .co_msg_parser          = fw_msg_parser,
      .co_free_data           = fw_free_data,
      .co_clone         = fw_clone,
      .co_get_opts            = fw_get_opts,
      .co_dump = {
          [NL_DUMP_LINE]      = fw_dump_line,
          [NL_DUMP_DETAILS]   = fw_dump_details,
      },
};

static void __init fw_init(void)
{
      rtnl_cls_register(&fw_ops);
}

static void __exit fw_exit(void)
{
      rtnl_cls_unregister(&fw_ops);
}

/** @} */

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