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/* 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 <linux/netfilter_ipv4.h>
#include <linux/netfilter_ipv6.h>
#include <linux/netfilter.h>
#include <net/netlink.h>
#include <net/pkt_sched.h>
/* Thanks to Doron Oz for this hack */
#if !defined(CONFIG_NET_CLS_ACT) && defined(CONFIG_NETFILTER)
static int nf_registered;
#endif
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 rtattr **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);
/*
* Unlike normal "enqueue" functions, ingress_enqueue returns a
* firewall FW_* code.
*/
#ifdef CONFIG_NET_CLS_ACT
sch->bstats.packets++;
sch->bstats.bytes += skb->len;
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;
}
#else
result = NF_ACCEPT;
sch->bstats.packets++;
sch->bstats.bytes += skb->len;
#endif
return result;
}
#if !defined(CONFIG_NET_CLS_ACT) && defined(CONFIG_NETFILTER)
static unsigned int ing_hook(unsigned int hook, struct sk_buff *skb,
const struct net_device *indev,
const struct net_device *outdev,
int (*okfn)(struct sk_buff *))
{
struct Qdisc *q;
struct net_device *dev = skb->dev;
int fwres = NF_ACCEPT;
if (dev->qdisc_ingress) {
spin_lock(&dev->ingress_lock);
if ((q = dev->qdisc_ingress) != NULL)
fwres = q->enqueue(skb, q);
spin_unlock(&dev->ingress_lock);
}
return fwres;
}
/* after ipt_filter */
static struct nf_hook_ops ing_ops[] __read_mostly = {
{
.hook = ing_hook,
.owner = THIS_MODULE,
.pf = PF_INET,
.hooknum = NF_INET_PRE_ROUTING,
.priority = NF_IP_PRI_FILTER + 1,
},
{
.hook = ing_hook,
.owner = THIS_MODULE,
.pf = PF_INET6,
.hooknum = NF_INET_PRE_ROUTING,
.priority = NF_IP6_PRI_FILTER + 1,
},
};
#endif
static int ingress_init(struct Qdisc *sch, struct rtattr *opt)
{
#if !defined(CONFIG_NET_CLS_ACT) && defined(CONFIG_NETFILTER)
printk("Ingress scheduler: Classifier actions prefered over netfilter\n");
if (!nf_registered) {
if (nf_register_hooks(ing_ops, ARRAY_SIZE(ing_ops)) < 0) {
printk("ingress qdisc registration error \n");
return -EINVAL;
}
nf_registered++;
}
#endif
return 0;
}
/* ------------------------------------------------------------- */
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)
{
unsigned char *b = skb_tail_pointer(skb);
struct rtattr *rta;
rta = (struct rtattr *)b;
RTA_PUT(skb, TCA_OPTIONS, 0, NULL);
rta->rta_len = skb_tail_pointer(skb) - b;
return skb->len;
rtattr_failure:
nlmsg_trim(skb, b);
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,
.init = ingress_init,
.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);
#if !defined(CONFIG_NET_CLS_ACT) && defined(CONFIG_NETFILTER)
if (nf_registered)
nf_unregister_hooks(ing_ops, ARRAY_SIZE(ing_ops));
#endif
}
module_init(ingress_module_init)
module_exit(ingress_module_exit)
MODULE_LICENSE("GPL");
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