399 строки
8.7 KiB
C
399 строки
8.7 KiB
C
/* 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>
|
|
|
|
|
|
#undef DEBUG_INGRESS
|
|
|
|
#ifdef DEBUG_INGRESS /* control */
|
|
#define DPRINTK(format,args...) printk(KERN_DEBUG format,##args)
|
|
#else
|
|
#define DPRINTK(format,args...)
|
|
#endif
|
|
|
|
#if 0 /* data */
|
|
#define D2PRINTK(format,args...) printk(KERN_DEBUG format,##args)
|
|
#else
|
|
#define D2PRINTK(format,args...)
|
|
#endif
|
|
|
|
|
|
#define PRIV(sch) qdisc_priv(sch)
|
|
|
|
|
|
/* Thanks to Doron Oz for this hack
|
|
*/
|
|
#ifndef CONFIG_NET_CLS_ACT
|
|
#ifdef CONFIG_NETFILTER
|
|
static int nf_registered;
|
|
#endif
|
|
#endif
|
|
|
|
struct ingress_qdisc_data {
|
|
struct Qdisc *q;
|
|
struct tcf_proto *filter_list;
|
|
};
|
|
|
|
|
|
/* ------------------------- Class/flow operations ------------------------- */
|
|
|
|
|
|
static int ingress_graft(struct Qdisc *sch,unsigned long arg,
|
|
struct Qdisc *new,struct Qdisc **old)
|
|
{
|
|
#ifdef DEBUG_INGRESS
|
|
struct ingress_qdisc_data *p = PRIV(sch);
|
|
#endif
|
|
|
|
DPRINTK("ingress_graft(sch %p,[qdisc %p],new %p,old %p)\n",
|
|
sch, p, new, old);
|
|
DPRINTK("\n ingress_graft: You cannot add qdiscs to classes");
|
|
return 1;
|
|
}
|
|
|
|
|
|
static struct Qdisc *ingress_leaf(struct Qdisc *sch, unsigned long arg)
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
|
|
static unsigned long ingress_get(struct Qdisc *sch,u32 classid)
|
|
{
|
|
#ifdef DEBUG_INGRESS
|
|
struct ingress_qdisc_data *p = PRIV(sch);
|
|
#endif
|
|
DPRINTK("ingress_get(sch %p,[qdisc %p],classid %x)\n", sch, p, 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)
|
|
{
|
|
#ifdef DEBUG_INGRESS
|
|
struct ingress_qdisc_data *p = PRIV(sch);
|
|
#endif
|
|
DPRINTK("ingress_change(sch %p,[qdisc %p],classid %x,parent %x),"
|
|
"arg 0x%lx\n", sch, p, classid, parent, *arg);
|
|
DPRINTK("No effect. sch_ingress doesn't maintain classes at the moment");
|
|
return 0;
|
|
}
|
|
|
|
|
|
|
|
static void ingress_walk(struct Qdisc *sch,struct qdisc_walker *walker)
|
|
{
|
|
#ifdef DEBUG_INGRESS
|
|
struct ingress_qdisc_data *p = PRIV(sch);
|
|
#endif
|
|
DPRINTK("ingress_walk(sch %p,[qdisc %p],walker %p)\n", sch, p, walker);
|
|
DPRINTK("No effect. sch_ingress doesn't maintain classes at the moment");
|
|
}
|
|
|
|
|
|
static struct tcf_proto **ingress_find_tcf(struct Qdisc *sch,unsigned long cl)
|
|
{
|
|
struct ingress_qdisc_data *p = PRIV(sch);
|
|
|
|
return &p->filter_list;
|
|
}
|
|
|
|
|
|
/* --------------------------- Qdisc operations ---------------------------- */
|
|
|
|
|
|
static int ingress_enqueue(struct sk_buff *skb,struct Qdisc *sch)
|
|
{
|
|
struct ingress_qdisc_data *p = PRIV(sch);
|
|
struct tcf_result res;
|
|
int result;
|
|
|
|
D2PRINTK("ingress_enqueue(skb %p,sch %p,[qdisc %p])\n", skb, sch, p);
|
|
result = tc_classify(skb, p->filter_list, &res);
|
|
D2PRINTK("result %d class 0x%04x\n", result, res.classid);
|
|
/*
|
|
* 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
|
|
D2PRINTK("Overriding result to ACCEPT\n");
|
|
result = NF_ACCEPT;
|
|
sch->bstats.packets++;
|
|
sch->bstats.bytes += skb->len;
|
|
#endif
|
|
|
|
return result;
|
|
}
|
|
|
|
|
|
static struct sk_buff *ingress_dequeue(struct Qdisc *sch)
|
|
{
|
|
/*
|
|
struct ingress_qdisc_data *p = PRIV(sch);
|
|
D2PRINTK("ingress_dequeue(sch %p,[qdisc %p])\n",sch,PRIV(p));
|
|
*/
|
|
return NULL;
|
|
}
|
|
|
|
|
|
static int ingress_requeue(struct sk_buff *skb,struct Qdisc *sch)
|
|
{
|
|
/*
|
|
struct ingress_qdisc_data *p = PRIV(sch);
|
|
D2PRINTK("ingress_requeue(skb %p,sch %p,[qdisc %p])\n",skb,sch,PRIV(p));
|
|
*/
|
|
return 0;
|
|
}
|
|
|
|
static unsigned int ingress_drop(struct Qdisc *sch)
|
|
{
|
|
#ifdef DEBUG_INGRESS
|
|
struct ingress_qdisc_data *p = PRIV(sch);
|
|
#endif
|
|
DPRINTK("ingress_drop(sch %p,[qdisc %p])\n", sch, p);
|
|
return 0;
|
|
}
|
|
|
|
#ifndef CONFIG_NET_CLS_ACT
|
|
#ifdef 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;
|
|
|
|
DPRINTK("ing_hook: skb %s dev=%s len=%u\n",
|
|
skb->sk ? "(owned)" : "(unowned)",
|
|
skb->dev ? skb->dev->name : "(no dev)",
|
|
skb->len);
|
|
|
|
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 = {
|
|
.hook = ing_hook,
|
|
.owner = THIS_MODULE,
|
|
.pf = PF_INET,
|
|
.hooknum = NF_IP_PRE_ROUTING,
|
|
.priority = NF_IP_PRI_FILTER + 1,
|
|
};
|
|
|
|
static struct nf_hook_ops ing6_ops = {
|
|
.hook = ing_hook,
|
|
.owner = THIS_MODULE,
|
|
.pf = PF_INET6,
|
|
.hooknum = NF_IP6_PRE_ROUTING,
|
|
.priority = NF_IP6_PRI_FILTER + 1,
|
|
};
|
|
|
|
#endif
|
|
#endif
|
|
|
|
static int ingress_init(struct Qdisc *sch,struct rtattr *opt)
|
|
{
|
|
struct ingress_qdisc_data *p = PRIV(sch);
|
|
|
|
/* Make sure either netfilter or preferably CLS_ACT is
|
|
* compiled in */
|
|
#ifndef CONFIG_NET_CLS_ACT
|
|
#ifndef CONFIG_NETFILTER
|
|
printk("You MUST compile classifier actions into the kernel\n");
|
|
return -EINVAL;
|
|
#else
|
|
printk("Ingress scheduler: Classifier actions prefered over netfilter\n");
|
|
#endif
|
|
#endif
|
|
|
|
#ifndef CONFIG_NET_CLS_ACT
|
|
#ifdef CONFIG_NETFILTER
|
|
if (!nf_registered) {
|
|
if (nf_register_hook(&ing_ops) < 0) {
|
|
printk("ingress qdisc registration error \n");
|
|
return -EINVAL;
|
|
}
|
|
nf_registered++;
|
|
|
|
if (nf_register_hook(&ing6_ops) < 0) {
|
|
printk("IPv6 ingress qdisc registration error, " \
|
|
"disabling IPv6 support.\n");
|
|
} else
|
|
nf_registered++;
|
|
}
|
|
#endif
|
|
#endif
|
|
|
|
DPRINTK("ingress_init(sch %p,[qdisc %p],opt %p)\n",sch,p,opt);
|
|
p->q = &noop_qdisc;
|
|
return 0;
|
|
}
|
|
|
|
|
|
static void ingress_reset(struct Qdisc *sch)
|
|
{
|
|
struct ingress_qdisc_data *p = PRIV(sch);
|
|
|
|
DPRINTK("ingress_reset(sch %p,[qdisc %p])\n", sch, p);
|
|
|
|
/*
|
|
#if 0
|
|
*/
|
|
/* for future use */
|
|
qdisc_reset(p->q);
|
|
/*
|
|
#endif
|
|
*/
|
|
}
|
|
|
|
/* ------------------------------------------------------------- */
|
|
|
|
|
|
/* ------------------------------------------------------------- */
|
|
|
|
static void ingress_destroy(struct Qdisc *sch)
|
|
{
|
|
struct ingress_qdisc_data *p = PRIV(sch);
|
|
|
|
DPRINTK("ingress_destroy(sch %p,[qdisc %p])\n", sch, p);
|
|
tcf_destroy_chain(p->filter_list);
|
|
#if 0
|
|
/* for future use */
|
|
qdisc_destroy(p->q);
|
|
#endif
|
|
}
|
|
|
|
|
|
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 struct Qdisc_class_ops ingress_class_ops = {
|
|
.graft = ingress_graft,
|
|
.leaf = ingress_leaf,
|
|
.get = ingress_get,
|
|
.put = ingress_put,
|
|
.change = ingress_change,
|
|
.delete = NULL,
|
|
.walk = ingress_walk,
|
|
.tcf_chain = ingress_find_tcf,
|
|
.bind_tcf = ingress_bind_filter,
|
|
.unbind_tcf = ingress_put,
|
|
.dump = NULL,
|
|
};
|
|
|
|
static struct Qdisc_ops ingress_qdisc_ops = {
|
|
.next = NULL,
|
|
.cl_ops = &ingress_class_ops,
|
|
.id = "ingress",
|
|
.priv_size = sizeof(struct ingress_qdisc_data),
|
|
.enqueue = ingress_enqueue,
|
|
.dequeue = ingress_dequeue,
|
|
.requeue = ingress_requeue,
|
|
.drop = ingress_drop,
|
|
.init = ingress_init,
|
|
.reset = ingress_reset,
|
|
.destroy = ingress_destroy,
|
|
.change = NULL,
|
|
.dump = ingress_dump,
|
|
.owner = THIS_MODULE,
|
|
};
|
|
|
|
static int __init ingress_module_init(void)
|
|
{
|
|
int ret = 0;
|
|
|
|
if ((ret = register_qdisc(&ingress_qdisc_ops)) < 0) {
|
|
printk("Unable to register Ingress qdisc\n");
|
|
return ret;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
static void __exit ingress_module_exit(void)
|
|
{
|
|
unregister_qdisc(&ingress_qdisc_ops);
|
|
#ifndef CONFIG_NET_CLS_ACT
|
|
#ifdef CONFIG_NETFILTER
|
|
if (nf_registered) {
|
|
nf_unregister_hook(&ing_ops);
|
|
if (nf_registered > 1)
|
|
nf_unregister_hook(&ing6_ops);
|
|
}
|
|
#endif
|
|
#endif
|
|
}
|
|
module_init(ingress_module_init)
|
|
module_exit(ingress_module_exit)
|
|
MODULE_LICENSE("GPL");
|