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/*

 * net/sched/simp.c     Simple example of an action

 *

 *              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.

 *

 * Authors:     Jamal Hadi Salim (2005)

 *

 */

#include <linux/module.h>

#include <linux/init.h>

#include <linux/kernel.h>

#include <linux/skbuff.h>

#include <linux/rtnetlink.h>

#include <net/netlink.h>

#include <net/pkt_sched.h>

#define TCA_ACT_SIMP 22

#include <linux/tc_act/tc_defact.h>

#include <net/tc_act/tc_defact.h>

#define SIMP_TAB_MASK     7

static struct tcf_common *tcf_simp_ht[SIMP_TAB_MASK + 1];

static u32 simp_idx_gen;

static DEFINE_RWLOCK(simp_lock);

static struct tcf_hashinfo simp_hash_info = {

        .htab   =       tcf_simp_ht,

        .hmask  =       SIMP_TAB_MASK,

        .lock   =       &simp_lock,

};

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

{

        struct tcf_defact *d = a->priv;

        spin_lock(&d->tcf_lock);

        d->tcf_tm.lastuse = jiffies;

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

        d->tcf_bstats.packets++;

        /* print policy string followed by _ then packet count

         * Example if this was the 3rd packet and the string was "hello"

         * then it would look like "hello_3" (without quotes)

         **/

        printk("simple: %s_%d\n",

               (char *)d->tcfd_defdata, d->tcf_bstats.packets);

        spin_unlock(&d->tcf_lock);

        return d->tcf_action;

}

static int tcf_simp_release(struct tcf_defact *d, int bind)

{

        int ret = 0;

        if (d) {

                if (bind)

                        d->tcf_bindcnt--;

                d->tcf_refcnt--;

                if (d->tcf_bindcnt <= 0 && d->tcf_refcnt <= 0) {

                        kfree(d->tcfd_defdata);

                        tcf_hash_destroy(&d->common, &simp_hash_info);

                        ret = 1;

                }

        }

        return ret;

}

static int alloc_defdata(struct tcf_defact *d, u32 datalen, void *defdata)

{

        d->tcfd_defdata = kmemdup(defdata, datalen, GFP_KERNEL);

        if (unlikely(!d->tcfd_defdata))

                return -ENOMEM;

        d->tcfd_datalen = datalen;

        return 0;

}

static int realloc_defdata(struct tcf_defact *d, u32 datalen, void *defdata)

{

        kfree(d->tcfd_defdata);

        return alloc_defdata(d, datalen, defdata);

}

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

                         struct tc_action *a, int ovr, int bind)

{

        struct rtattr *tb[TCA_DEF_MAX];

        struct tc_defact *parm;

        struct tcf_defact *d;

        struct tcf_common *pc;

        void *defdata;

        u32 datalen = 0;

        int ret = 0;

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

                return -EINVAL;

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

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

                return -EINVAL;

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

        defdata = RTA_DATA(tb[TCA_DEF_DATA - 1]);

        if (defdata == NULL)

                return -EINVAL;

        datalen = RTA_PAYLOAD(tb[TCA_DEF_DATA - 1]);

        if (datalen <= 0)

                return -EINVAL;

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

        if (!pc) {

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

                                     &simp_idx_gen, &simp_hash_info);

                if (unlikely(!pc))

                        return -ENOMEM;

                d = to_defact(pc);

                ret = alloc_defdata(d, datalen, defdata);

                if (ret < 0) {

                        kfree(pc);

                        return ret;

                }

                ret = ACT_P_CREATED;

        } else {

                d = to_defact(pc);

                if (!ovr) {

                        tcf_simp_release(d, bind);

                        return -EEXIST;

                }

                realloc_defdata(d, datalen, defdata);

        }

        spin_lock_bh(&d->tcf_lock);

        d->tcf_action = parm->action;

        spin_unlock_bh(&d->tcf_lock);

        if (ret == ACT_P_CREATED)

                tcf_hash_insert(pc, &simp_hash_info);

        return ret;

}

static inline int tcf_simp_cleanup(struct tc_action *a, int bind)

{

        struct tcf_defact *d = a->priv;

        if (d)

                return tcf_simp_release(d, bind);

        return 0;

}

static inline int tcf_simp_dump(struct sk_buff *skb, struct tc_action *a,

                                int bind, int ref)

{

        unsigned char *b = skb_tail_pointer(skb);

        struct tcf_defact *d = a->priv;

        struct tc_defact opt;

        struct tcf_t t;

        opt.index = d->tcf_index;

        opt.refcnt = d->tcf_refcnt - ref;

        opt.bindcnt = d->tcf_bindcnt - bind;

        opt.action = d->tcf_action;

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

        RTA_PUT(skb, TCA_DEF_DATA, d->tcfd_datalen, d->tcfd_defdata);

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

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

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

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

        return skb->len;

rtattr_failure:

        nlmsg_trim(skb, b);

        return -1;

}

static struct tc_action_ops act_simp_ops = {

        .kind           =       "simple",

        .hinfo          =       &simp_hash_info,

        .type           =       TCA_ACT_SIMP,

        .capab          =       TCA_CAP_NONE,

        .owner          =       THIS_MODULE,

        .act            =       tcf_simp,

        .dump           =       tcf_simp_dump,

        .cleanup        =       tcf_simp_cleanup,

        .init           =       tcf_simp_init,

        .walk           =       tcf_generic_walker,

};

MODULE_AUTHOR("Jamal Hadi Salim(2005)");

MODULE_DESCRIPTION("Simple example action");

MODULE_LICENSE("GPL");

static int __init simp_init_module(void)

{

        int ret = tcf_register_action(&act_simp_ops);

        if (!ret)

                printk("Simple TC action Loaded\n");

        return ret;

}

static void __exit simp_cleanup_module(void)

{

        tcf_unregister_action(&act_simp_ops);

}

module_init(simp_init_module);

module_exit(simp_cleanup_module);