Subversion Repositories or1k_soc_on_altera_embedded_dev_kit

/*

 * net/sched/gact.c     Generic actions

 *

 *              This program is free software; you can redistribute it and/or

 *              modify it under the terms of the GNU General Public License

 *              as published by the Free Software Foundation; either version

 *              2 of the License, or (at your option) any later version.

 *

 * copyright    Jamal Hadi Salim (2002-4)

 *

 */

#include <linux/types.h>

#include <linux/kernel.h>

#include <linux/string.h>

#include <linux/errno.h>

#include <linux/skbuff.h>

#include <linux/rtnetlink.h>

#include <linux/module.h>

#include <linux/init.h>

#include <net/netlink.h>

#include <net/pkt_sched.h>

#include <linux/tc_act/tc_gact.h>

#include <net/tc_act/tc_gact.h>

#define GACT_TAB_MASK   15

static struct tcf_common *tcf_gact_ht[GACT_TAB_MASK + 1];

static u32 gact_idx_gen;

static DEFINE_RWLOCK(gact_lock);

static struct tcf_hashinfo gact_hash_info = {

        .htab   =       tcf_gact_ht,

        .hmask  =       GACT_TAB_MASK,

        .lock   =       &gact_lock,

};

#ifdef CONFIG_GACT_PROB

static int gact_net_rand(struct tcf_gact *gact)

{

        if (!gact->tcfg_pval || net_random() % gact->tcfg_pval)

                return gact->tcf_action;

        return gact->tcfg_paction;

}

static int gact_determ(struct tcf_gact *gact)

{

        if (!gact->tcfg_pval || gact->tcf_bstats.packets % gact->tcfg_pval)

                return gact->tcf_action;

        return gact->tcfg_paction;

}

typedef int (*g_rand)(struct tcf_gact *gact);

static g_rand gact_rand[MAX_RAND]= { NULL, gact_net_rand, gact_determ };

#endif /* CONFIG_GACT_PROB */

static int tcf_gact_init(struct rtattr *rta, struct rtattr *est,

                         struct tc_action *a, int ovr, int bind)

{

        struct rtattr *tb[TCA_GACT_MAX];

        struct tc_gact *parm;

        struct tcf_gact *gact;

        struct tcf_common *pc;

        int ret = 0;

        if (rta == NULL || rtattr_parse_nested(tb, TCA_GACT_MAX, rta) < 0)

                return -EINVAL;

        if (tb[TCA_GACT_PARMS - 1] == NULL ||

            RTA_PAYLOAD(tb[TCA_GACT_PARMS - 1]) < sizeof(*parm))

                return -EINVAL;

        parm = RTA_DATA(tb[TCA_GACT_PARMS - 1]);

        if (tb[TCA_GACT_PROB-1] != NULL)

#ifdef CONFIG_GACT_PROB

                if (RTA_PAYLOAD(tb[TCA_GACT_PROB-1]) < sizeof(struct tc_gact_p))

                        return -EINVAL;

#else

                return -EOPNOTSUPP;

#endif

        pc = tcf_hash_check(parm->index, a, bind, &gact_hash_info);

        if (!pc) {

                pc = tcf_hash_create(parm->index, est, a, sizeof(*gact),

                                     bind, &gact_idx_gen, &gact_hash_info);

                if (unlikely(!pc))

                        return -ENOMEM;

                ret = ACT_P_CREATED;

        } else {

                if (!ovr) {

                        tcf_hash_release(pc, bind, &gact_hash_info);

                        return -EEXIST;

                }

        }

        gact = to_gact(pc);

        spin_lock_bh(&gact->tcf_lock);

        gact->tcf_action = parm->action;

#ifdef CONFIG_GACT_PROB

        if (tb[TCA_GACT_PROB-1] != NULL) {

                struct tc_gact_p *p_parm = RTA_DATA(tb[TCA_GACT_PROB-1]);

                gact->tcfg_paction = p_parm->paction;

                gact->tcfg_pval    = p_parm->pval;

                gact->tcfg_ptype   = p_parm->ptype;

        }

#endif

        spin_unlock_bh(&gact->tcf_lock);

        if (ret == ACT_P_CREATED)

                tcf_hash_insert(pc, &gact_hash_info);

        return ret;

}

static int tcf_gact_cleanup(struct tc_action *a, int bind)

{

        struct tcf_gact *gact = a->priv;

        if (gact)

                return tcf_hash_release(&gact->common, bind, &gact_hash_info);

        return 0;

}

static int tcf_gact(struct sk_buff *skb, struct tc_action *a, struct tcf_result *res)

{

        struct tcf_gact *gact = a->priv;

        int action = TC_ACT_SHOT;

        spin_lock(&gact->tcf_lock);

#ifdef CONFIG_GACT_PROB

        if (gact->tcfg_ptype && gact_rand[gact->tcfg_ptype] != NULL)

                action = gact_rand[gact->tcfg_ptype](gact);

        else

                action = gact->tcf_action;

#else

        action = gact->tcf_action;

#endif

        gact->tcf_bstats.bytes += skb->len;

        gact->tcf_bstats.packets++;

        if (action == TC_ACT_SHOT)

                gact->tcf_qstats.drops++;

        gact->tcf_tm.lastuse = jiffies;

        spin_unlock(&gact->tcf_lock);

        return action;

}

static int tcf_gact_dump(struct sk_buff *skb, struct tc_action *a, int bind, int ref)

{

        unsigned char *b = skb_tail_pointer(skb);

        struct tc_gact opt;

        struct tcf_gact *gact = a->priv;

        struct tcf_t t;

        opt.index = gact->tcf_index;

        opt.refcnt = gact->tcf_refcnt - ref;

        opt.bindcnt = gact->tcf_bindcnt - bind;

        opt.action = gact->tcf_action;

        RTA_PUT(skb, TCA_GACT_PARMS, sizeof(opt), &opt);

#ifdef CONFIG_GACT_PROB

        if (gact->tcfg_ptype) {

                struct tc_gact_p p_opt;

                p_opt.paction = gact->tcfg_paction;

                p_opt.pval = gact->tcfg_pval;

                p_opt.ptype = gact->tcfg_ptype;

                RTA_PUT(skb, TCA_GACT_PROB, sizeof(p_opt), &p_opt);

        }

#endif

        t.install = jiffies_to_clock_t(jiffies - gact->tcf_tm.install);

        t.lastuse = jiffies_to_clock_t(jiffies - gact->tcf_tm.lastuse);

        t.expires = jiffies_to_clock_t(gact->tcf_tm.expires);

        RTA_PUT(skb, TCA_GACT_TM, sizeof(t), &t);

        return skb->len;

rtattr_failure:

        nlmsg_trim(skb, b);

        return -1;

}

static struct tc_action_ops act_gact_ops = {

        .kind           =       "gact",

        .hinfo          =       &gact_hash_info,

        .type           =       TCA_ACT_GACT,

        .capab          =       TCA_CAP_NONE,

        .owner          =       THIS_MODULE,

        .act            =       tcf_gact,

        .dump           =       tcf_gact_dump,

        .cleanup        =       tcf_gact_cleanup,

        .lookup         =       tcf_hash_search,

        .init           =       tcf_gact_init,

        .walk           =       tcf_generic_walker

};

MODULE_AUTHOR("Jamal Hadi Salim(2002-4)");

MODULE_DESCRIPTION("Generic Classifier actions");

MODULE_LICENSE("GPL");

static int __init gact_init_module(void)

{

#ifdef CONFIG_GACT_PROB

        printk("GACT probability on\n");

#else

        printk("GACT probability NOT on\n");

#endif

        return tcf_register_action(&act_gact_ops);

}

static void __exit gact_cleanup_module(void)

{

        tcf_unregister_action(&act_gact_ops);

}

module_init(gact_init_module);

module_exit(gact_cleanup_module);