cgroup.c

/*
 * lib/route/cls/cgroup.c       Control Groups 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) 2009-2013 Thomas Graf <tgraf@suug.ch>
 */

/**
 * @ingroup cls
 * @defgroup cls_cgroup Control Groups Classifier
 *
 * @{
 */

#include <netlink-private/netlink.h>
#include <netlink-private/tc.h>
#include <netlink/netlink.h>
#include <netlink/attr.h>
#include <netlink/utils.h>
#include <netlink-private/route/tc-api.h>
#include <netlink/route/classifier.h>
#include <netlink/route/cls/cgroup.h>
#include <netlink/route/cls/ematch.h>

/** @cond SKIP */
#define CGROUP_ATTR_EMATCH      0x001
/** @endcond */

static struct nla_policy cgroup_policy[TCA_CGROUP_MAX+1] = {
        [TCA_CGROUP_EMATCHES]   = { .type = NLA_NESTED },
};

static int cgroup_clone(void *dst, void *src)
{
        return -NLE_OPNOTSUPP;
}

static void cgroup_free_data(struct rtnl_tc *tc, void *data)
{
        struct rtnl_cgroup *c = data;

        if (!c)
                return;

        rtnl_ematch_tree_free(c->cg_ematch);
}

static int cgroup_msg_parser(struct rtnl_tc *tc, void *data)
{
        struct nlattr *tb[TCA_CGROUP_MAX + 1];
        struct rtnl_cgroup *c = data;
        int err;

        err = tca_parse(tb, TCA_CGROUP_MAX, tc, cgroup_policy);
        if (err < 0)
                return err;

        if (tb[TCA_CGROUP_EMATCHES]) {
                if ((err = rtnl_ematch_parse_attr(tb[TCA_CGROUP_EMATCHES],
                                                  &c->cg_ematch)) < 0)
                        return err;
                c->cg_mask |= CGROUP_ATTR_EMATCH;
        }

#if 0
        TODO:
        TCA_CGROUP_ACT,
        TCA_CGROUP_POLICE,
#endif

        return 0;
}

static void cgroup_dump_line(struct rtnl_tc *tc, void *data,
                             struct nl_dump_params *p)
{
        struct rtnl_cgroup *c = data;

        if (!c)
                return;

        if (c->cg_mask & CGROUP_ATTR_EMATCH)
                nl_dump(p, " ematch");
        else
                nl_dump(p, " match-all");
}

static void cgroup_dump_details(struct rtnl_tc *tc, void *data,
                                struct nl_dump_params *p)
{
        struct rtnl_cgroup *c = data;

        if (!c)
                return;

        if (c->cg_mask & CGROUP_ATTR_EMATCH) {
                nl_dump_line(p, "    ematch ");

                if (c->cg_ematch)
                        rtnl_ematch_tree_dump(c->cg_ematch, p);
                else
                        nl_dump(p, "<no tree>");
        } else
                nl_dump(p, "no options");
}

static int cgroup_fill_msg(struct rtnl_tc *tc, void *data,
                           struct nl_msg *msg)
{
        struct rtnl_cgroup *c = data;

        if (!c)
                BUG();

        if (!(tc->ce_mask & TCA_ATTR_HANDLE))
                return -NLE_MISSING_ATTR;

        if (c->cg_mask & CGROUP_ATTR_EMATCH)
                return rtnl_ematch_fill_attr(msg, TCA_CGROUP_EMATCHES,
                                             c->cg_ematch);

        return 0;
}


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

void rtnl_cgroup_set_ematch(struct rtnl_cls *cls, struct rtnl_ematch_tree *tree)
{
        struct rtnl_cgroup *c;

        if (!(c = rtnl_tc_data(TC_CAST(cls))))
                BUG();

        if (c->cg_ematch) {
                rtnl_ematch_tree_free(c->cg_ematch);
                c->cg_mask &= ~CGROUP_ATTR_EMATCH;
        }

        c->cg_ematch = tree;

        if (tree)
                c->cg_mask |= CGROUP_ATTR_EMATCH;
}

struct rtnl_ematch_tree *rtnl_cgroup_get_ematch(struct rtnl_cls *cls)
{
        struct rtnl_cgroup *c;

        if (!(c = rtnl_tc_data(TC_CAST(cls))))
                BUG();

        return c->cg_ematch;
}

/** @} */

static struct rtnl_tc_ops cgroup_ops = {
        .to_kind                = "cgroup",
        .to_type                = RTNL_TC_TYPE_CLS,
        .to_size                = sizeof(struct rtnl_cgroup),
        .to_clone               = cgroup_clone,
        .to_msg_parser          = cgroup_msg_parser,
        .to_free_data           = cgroup_free_data,
        .to_msg_fill            = cgroup_fill_msg,
        .to_dump = {
            [NL_DUMP_LINE]      = cgroup_dump_line,
            [NL_DUMP_DETAILS]   = cgroup_dump_details,
        },
};

static void __init cgroup_init(void)
{
        rtnl_tc_register(&cgroup_ops);
}

static void __exit cgroup_exit(void)
{
        rtnl_tc_unregister(&cgroup_ops);
}

/** @} */