root/net/sched/sch_ingress.c

DEFINITIONS

1. ingress_graft
2. ingress_leaf
3. ingress_get
4. ingress_bind_filter
5. ingress_put
6. ingress_change
7. ingress_walk
8. ingress_find_tcf
9. ingress_enqueue
10. ingress_destroy
11. ingress_dump
12. ingress_module_init
13. ingress_module_exit

/* net/sched/sch_ingress.c - Ingress qdisc
 *              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 1999
 */

#include <linux/module.h>
#include <linux/types.h>
#include <linux/list.h>
#include <linux/skbuff.h>
#include <linux/rtnetlink.h>
#include <net/netlink.h>
#include <net/pkt_sched.h>


struct ingress_qdisc_data {
        struct tcf_proto        *filter_list;
};

/* ------------------------- Class/flow operations ------------------------- */

static int ingress_graft(struct Qdisc *sch, unsigned long arg,
                         struct Qdisc *new, struct Qdisc **old)
{
        return -EOPNOTSUPP;
}

static struct Qdisc *ingress_leaf(struct Qdisc *sch, unsigned long arg)
{
        return NULL;
}

static unsigned long ingress_get(struct Qdisc *sch, u32 classid)
{
        return TC_H_MIN(classid) + 1;
}

static unsigned long ingress_bind_filter(struct Qdisc *sch,
                                         unsigned long parent, u32 classid)
{
        return ingress_get(sch, classid);
}

static void ingress_put(struct Qdisc *sch, unsigned long cl)
{
}

static int ingress_change(struct Qdisc *sch, u32 classid, u32 parent,
                          struct nlattr **tca, unsigned long *arg)
{
        return 0;
}

static void ingress_walk(struct Qdisc *sch, struct qdisc_walker *walker)
{
        return;
}

static struct tcf_proto **ingress_find_tcf(struct Qdisc *sch, unsigned long cl)
{
        struct ingress_qdisc_data *p = qdisc_priv(sch);

        return &p->filter_list;
}

/* --------------------------- Qdisc operations ---------------------------- */

static int ingress_enqueue(struct sk_buff *skb, struct Qdisc *sch)
{
        struct ingress_qdisc_data *p = qdisc_priv(sch);
        struct tcf_result res;
        int result;

        result = tc_classify(skb, p->filter_list, &res);

        sch->bstats.packets++;
        sch->bstats.bytes += qdisc_pkt_len(skb);
        switch (result) {
        case TC_ACT_SHOT:
                result = TC_ACT_SHOT;
                sch->qstats.drops++;
                break;
        case TC_ACT_STOLEN:
        case TC_ACT_QUEUED:
                result = TC_ACT_STOLEN;
                break;
        case TC_ACT_RECLASSIFY:
        case TC_ACT_OK:
                skb->tc_index = TC_H_MIN(res.classid);
        default:
                result = TC_ACT_OK;
                break;
        }

        return result;
}

/* ------------------------------------------------------------- */

static void ingress_destroy(struct Qdisc *sch)
{
        struct ingress_qdisc_data *p = qdisc_priv(sch);

        tcf_destroy_chain(&p->filter_list);
}

static int ingress_dump(struct Qdisc *sch, struct sk_buff *skb)
{
        struct nlattr *nest;

        nest = nla_nest_start(skb, TCA_OPTIONS);
        if (nest == NULL)
                goto nla_put_failure;
        nla_nest_end(skb, nest);
        return skb->len;

nla_put_failure:
        nla_nest_cancel(skb, nest);
        return -1;
}

static const struct Qdisc_class_ops ingress_class_ops = {
        .graft          =       ingress_graft,
        .leaf           =       ingress_leaf,
        .get            =       ingress_get,
        .put            =       ingress_put,
        .change         =       ingress_change,
        .walk           =       ingress_walk,
        .tcf_chain      =       ingress_find_tcf,
        .bind_tcf       =       ingress_bind_filter,
        .unbind_tcf     =       ingress_put,
};

static struct Qdisc_ops ingress_qdisc_ops __read_mostly = {
        .cl_ops         =       &ingress_class_ops,
        .id             =       "ingress",
        .priv_size      =       sizeof(struct ingress_qdisc_data),
        .enqueue        =       ingress_enqueue,
        .destroy        =       ingress_destroy,
        .dump           =       ingress_dump,
        .owner          =       THIS_MODULE,
};

static int __init ingress_module_init(void)
{
        return register_qdisc(&ingress_qdisc_ops);
}

static void __exit ingress_module_exit(void)
{
        unregister_qdisc(&ingress_qdisc_ops);
}

module_init(ingress_module_init)
module_exit(ingress_module_exit)
MODULE_LICENSE("GPL");