[mirror_ubuntu-jammy-kernel.git] / net / sched / sch_ingress.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/skbuff.h>
#include <linux/netdevice.h>
#include <linux/rtnetlink.h>
#include <linux/netfilter_ipv4.h>
#include <linux/netfilter_ipv6.h>
#include <linux/netfilter.h>
#include <linux/smp.h>
#include <net/netlink.h>
#include <net/pkt_sched.h>
#include <asm/byteorder.h>
#include <asm/uaccess.h>
#include <linux/kmod.h>
#include <linux/stat.h>
#include <linux/interrupt.h>
#include <linux/list.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:
		case TC_ACT_UNSPEC:
		default:
			skb->tc_index = TC_H_MIN(res.classid);
			result = TC_ACT_OK;
			break;
	}
/* backward compat */
#else
#ifdef	CONFIG_NET_CLS_POLICE
	switch (result) {
		case TC_POLICE_SHOT:
		result = NF_DROP;
		sch->qstats.drops++;
		break;
		case TC_POLICE_RECLASSIFY: /* DSCP remarking here ? */
		case TC_POLICE_OK:
		case TC_POLICE_UNSPEC:
		default:
		sch->bstats.packets++;
		sch->bstats.bytes += skb->len;
		result = NF_ACCEPT;
		break;
	}

#else
	D2PRINTK("Overriding result to ACCEPT\n");
	result = NF_ACCEPT;
	sch->bstats.packets++;
	sch->bstats.bytes += skb->len;
#endif
#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 **pskb,
			     const struct net_device *indev,
			     const struct net_device *outdev,
			     int (*okfn)(struct sk_buff *))
{

	struct Qdisc *q;
	struct sk_buff *skb = *pskb;
	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 ? (*pskb)->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");
Commit	Line	Data
10297b99	1	/* net/sched/sch_ingress.c - Ingress qdisc
1da177e4 LT	2	* This program is free software; you can redistribute it and/or
	3	* modify it under the terms of the GNU General Public License
	4	* as published by the Free Software Foundation; either version
	5	* 2 of the License, or (at your option) any later version.
	6	*
	7	* Authors: Jamal Hadi Salim 1999
	8	*/
	9
1da177e4 LT	10	#include <linux/module.h>
	11	#include <linux/types.h>
	12	#include <linux/skbuff.h>
	13	#include <linux/netdevice.h>
	14	#include <linux/rtnetlink.h>
	15	#include <linux/netfilter_ipv4.h>
	16	#include <linux/netfilter_ipv6.h>
	17	#include <linux/netfilter.h>
	18	#include <linux/smp.h>
dc5fc579	19	#include <net/netlink.h>
1da177e4 LT	20	#include <net/pkt_sched.h>
	21	#include <asm/byteorder.h>
	22	#include <asm/uaccess.h>
	23	#include <linux/kmod.h>
	24	#include <linux/stat.h>
	25	#include <linux/interrupt.h>
	26	#include <linux/list.h>
	27
	28
	29	#undef DEBUG_INGRESS
	30
	31	#ifdef DEBUG_INGRESS /* control */
	32	#define DPRINTK(format,args...) printk(KERN_DEBUG format,##args)
	33	#else
	34	#define DPRINTK(format,args...)
	35	#endif
	36
	37	#if 0 /* data */
	38	#define D2PRINTK(format,args...) printk(KERN_DEBUG format,##args)
	39	#else
	40	#define D2PRINTK(format,args...)
	41	#endif
	42
	43
	44	#define PRIV(sch) qdisc_priv(sch)
	45
	46
	47	/* Thanks to Doron Oz for this hack
	48	*/
	49	#ifndef CONFIG_NET_CLS_ACT
	50	#ifdef CONFIG_NETFILTER
10297b99	51	static int nf_registered;
1da177e4 LT	52	#endif
	53	#endif
	54
	55	struct ingress_qdisc_data {
	56	struct Qdisc *q;
	57	struct tcf_proto *filter_list;
	58	};
	59
	60
	61	/* ------------------------- Class/flow operations ------------------------- */
	62
	63
	64	static int ingress_graft(struct Qdisc *sch,unsigned long arg,
	65	struct Qdisc new,struct Qdisc *old)
	66	{
	67	#ifdef DEBUG_INGRESS
	68	struct ingress_qdisc_data *p = PRIV(sch);
	69	#endif
	70
	71	DPRINTK("ingress_graft(sch %p,[qdisc %p],new %p,old %p)\n",
	72	sch, p, new, old);
	73	DPRINTK("\n ingress_graft: You cannot add qdiscs to classes");
10297b99	74	return 1;
1da177e4 LT	75	}
	76
	77
	78	static struct Qdisc ingress_leaf(struct Qdisc sch, unsigned long arg)
	79	{
	80	return NULL;
	81	}
	82
	83
	84	static unsigned long ingress_get(struct Qdisc *sch,u32 classid)
	85	{
	86	#ifdef DEBUG_INGRESS
	87	struct ingress_qdisc_data *p = PRIV(sch);
	88	#endif
	89	DPRINTK("ingress_get(sch %p,[qdisc %p],classid %x)\n", sch, p, classid);
	90	return TC_H_MIN(classid) + 1;
	91	}
	92
	93
	94	static unsigned long ingress_bind_filter(struct Qdisc *sch,
	95	unsigned long parent, u32 classid)
	96	{
	97	return ingress_get(sch, classid);
	98	}
	99
	100
	101	static void ingress_put(struct Qdisc *sch, unsigned long cl)
	102	{
	103	}
	104
	105
	106	static int ingress_change(struct Qdisc *sch, u32 classid, u32 parent,
	107	struct rtattr *tca, unsigned long arg)
	108	{
	109	#ifdef DEBUG_INGRESS
	110	struct ingress_qdisc_data *p = PRIV(sch);
	111	#endif
	112	DPRINTK("ingress_change(sch %p,[qdisc %p],classid %x,parent %x),"
	113	"arg 0x%lx\n", sch, p, classid, parent, *arg);
	114	DPRINTK("No effect. sch_ingress doesn't maintain classes at the moment");
	115	return 0;
	116	}
	117
	118
	119
	120	static void ingress_walk(struct Qdisc sch,struct qdisc_walker walker)
	121	{
	122	#ifdef DEBUG_INGRESS
	123	struct ingress_qdisc_data *p = PRIV(sch);
	124	#endif
	125	DPRINTK("ingress_walk(sch %p,[qdisc %p],walker %p)\n", sch, p, walker);
	126	DPRINTK("No effect. sch_ingress doesn't maintain classes at the moment");
	127	}
	128
	129
	130	static struct tcf_proto *ingress_find_tcf(struct Qdisc sch,unsigned long cl)
	131	{
	132	struct ingress_qdisc_data *p = PRIV(sch);
	133
	134	return &p->filter_list;
	135	}
	136
	137
	138	/* --------------------------- Qdisc operations ---------------------------- */
139
140
141	static int ingress_enqueue(struct sk_buff skb,struct Qdisc sch)
142	{
143	struct ingress_qdisc_data *p = PRIV(sch);
144	struct tcf_result res;
145	int result;
146
147	D2PRINTK("ingress_enqueue(skb %p,sch %p,[qdisc %p])\n", skb, sch, p);
148	result = tc_classify(skb, p->filter_list, &res);
149	D2PRINTK("result %d class 0x%04x\n", result, res.classid);
150	/*
151	* Unlike normal "enqueue" functions, ingress_enqueue returns a
152	* firewall FW_* code.
153	*/
154	#ifdef CONFIG_NET_CLS_ACT
155	sch->bstats.packets++;
156	sch->bstats.bytes += skb->len;
157	switch (result) {
158	case TC_ACT_SHOT:
159	result = TC_ACT_SHOT;
160	sch->qstats.drops++;
161	break;
162	case TC_ACT_STOLEN:
163	case TC_ACT_QUEUED:
164	result = TC_ACT_STOLEN;
165	break;
10297b99	166	case TC_ACT_RECLASSIFY:
1da177e4 LT	167	case TC_ACT_OK:
	168	case TC_ACT_UNSPEC:
	169	default:
	170	skb->tc_index = TC_H_MIN(res.classid);
	171	result = TC_ACT_OK;
	172	break;
3ff50b79	173	}
1da177e4 LT	174	/* backward compat */
1da177e4 LT	175	#else
10297b99	176	#ifdef CONFIG_NET_CLS_POLICE
1da177e4 LT	177	switch (result) {
	178	case TC_POLICE_SHOT:
	179	result = NF_DROP;
	180	sch->qstats.drops++;
	181	break;
	182	case TC_POLICE_RECLASSIFY: /* DSCP remarking here ? */
	183	case TC_POLICE_OK:
	184	case TC_POLICE_UNSPEC:
	185	default:
	186	sch->bstats.packets++;
	187	sch->bstats.bytes += skb->len;
	188	result = NF_ACCEPT;
	189	break;
3ff50b79	190	}
1da177e4 LT	191
	192	#else
	193	D2PRINTK("Overriding result to ACCEPT\n");
	194	result = NF_ACCEPT;
	195	sch->bstats.packets++;
	196	sch->bstats.bytes += skb->len;
	197	#endif
	198	#endif
	199
	200	return result;
	201	}
	202
	203
	204	static struct sk_buff ingress_dequeue(struct Qdisc sch)
	205	{
	206	/*
	207	struct ingress_qdisc_data *p = PRIV(sch);
	208	D2PRINTK("ingress_dequeue(sch %p,[qdisc %p])\n",sch,PRIV(p));
	209	*/
	210	return NULL;
	211	}
	212
	213
	214	static int ingress_requeue(struct sk_buff skb,struct Qdisc sch)
	215	{
	216	/*
	217	struct ingress_qdisc_data *p = PRIV(sch);
	218	D2PRINTK("ingress_requeue(skb %p,sch %p,[qdisc %p])\n",skb,sch,PRIV(p));
	219	*/
	220	return 0;
	221	}
	222
	223	static unsigned int ingress_drop(struct Qdisc *sch)
	224	{
	225	#ifdef DEBUG_INGRESS
	226	struct ingress_qdisc_data *p = PRIV(sch);
	227	#endif
	228	DPRINTK("ingress_drop(sch %p,[qdisc %p])\n", sch, p);
	229	return 0;
	230	}
	231
	232	#ifndef CONFIG_NET_CLS_ACT
	233	#ifdef CONFIG_NETFILTER
	234	static unsigned int
	235	ing_hook(unsigned int hook, struct sk_buff **pskb,
10297b99 YH	236	const struct net_device *indev,
	237	const struct net_device *outdev,
	238	int (okfn)(struct sk_buff ))
1da177e4	239	{
10297b99	240
1da177e4 LT	241	struct Qdisc *q;
1da177e4 LT	242	struct sk_buff skb = pskb;
10297b99	243	struct net_device *dev = skb->dev;
1da177e4 LT	244	int fwres=NF_ACCEPT;
	245
	246	DPRINTK("ing_hook: skb %s dev=%s len=%u\n",
	247	skb->sk ? "(owned)" : "(unowned)",
	248	skb->dev ? (*pskb)->dev->name : "(no dev)",
	249	skb->len);
	250
1da177e4	251	if (dev->qdisc_ingress) {
fd44de7c	252	spin_lock(&dev->ingress_lock);
1da177e4 LT	253	if ((q = dev->qdisc_ingress) != NULL)
1da177e4 LT	254	fwres = q->enqueue(skb, q);
fd44de7c	255	spin_unlock(&dev->ingress_lock);
10297b99 YH	256	}
10297b99 YH	257
1da177e4 LT	258	return fwres;
	259	}
	260
	261	/* after ipt_filter */
	262	static struct nf_hook_ops ing_ops = {
	263	.hook = ing_hook,
	264	.owner = THIS_MODULE,
	265	.pf = PF_INET,
	266	.hooknum = NF_IP_PRE_ROUTING,
	267	.priority = NF_IP_PRI_FILTER + 1,
	268	};
	269
	270	static struct nf_hook_ops ing6_ops = {
	271	.hook = ing_hook,
	272	.owner = THIS_MODULE,
	273	.pf = PF_INET6,
	274	.hooknum = NF_IP6_PRE_ROUTING,
	275	.priority = NF_IP6_PRI_FILTER + 1,
	276	};
	277
	278	#endif
	279	#endif
	280
	281	static int ingress_init(struct Qdisc sch,struct rtattr opt)
	282	{
	283	struct ingress_qdisc_data *p = PRIV(sch);
	284
	285	/* Make sure either netfilter or preferably CLS_ACT is
	286	* compiled in */
	287	#ifndef CONFIG_NET_CLS_ACT
	288	#ifndef CONFIG_NETFILTER
	289	printk("You MUST compile classifier actions into the kernel\n");
	290	return -EINVAL;
	291	#else
	292	printk("Ingress scheduler: Classifier actions prefered over netfilter\n");
	293	#endif
	294	#endif
10297b99	295
1da177e4 LT	296	#ifndef CONFIG_NET_CLS_ACT
	297	#ifdef CONFIG_NETFILTER
	298	if (!nf_registered) {
	299	if (nf_register_hook(&ing_ops) < 0) {
	300	printk("ingress qdisc registration error \n");
	301	return -EINVAL;
	302	}
	303	nf_registered++;
	304
	305	if (nf_register_hook(&ing6_ops) < 0) {
	306	printk("IPv6 ingress qdisc registration error, " \
	307	"disabling IPv6 support.\n");
	308	} else
	309	nf_registered++;
	310	}
	311	#endif
	312	#endif
	313
	314	DPRINTK("ingress_init(sch %p,[qdisc %p],opt %p)\n",sch,p,opt);
	315	p->q = &noop_qdisc;
	316	return 0;
	317	}
	318
	319
	320	static void ingress_reset(struct Qdisc *sch)
	321	{
	322	struct ingress_qdisc_data *p = PRIV(sch);
	323
	324	DPRINTK("ingress_reset(sch %p,[qdisc %p])\n", sch, p);
	325
	326	/*
	327	#if 0
	328	*/
	329	/* for future use */
	330	qdisc_reset(p->q);
	331	/*
	332	#endif
	333	*/
	334	}
	335
	336	/* ------------------------------------------------------------- */
	337
	338
	339	/* ------------------------------------------------------------- */
	340
	341	static void ingress_destroy(struct Qdisc *sch)
	342	{
	343	struct ingress_qdisc_data *p = PRIV(sch);
1da177e4 LT	344
1da177e4 LT	345	DPRINTK("ingress_destroy(sch %p,[qdisc %p])\n", sch, p);
a48b5a61	346	tcf_destroy_chain(p->filter_list);
1da177e4 LT	347	#if 0
	348	/* for future use */
	349	qdisc_destroy(p->q);
	350	#endif
	351	}
	352
	353
	354	static int ingress_dump(struct Qdisc sch, struct sk_buff skb)
	355	{
27a884dc	356	unsigned char *b = skb_tail_pointer(skb);
1da177e4 LT	357	struct rtattr *rta;
	358
	359	rta = (struct rtattr *) b;
	360	RTA_PUT(skb, TCA_OPTIONS, 0, NULL);
27a884dc	361	rta->rta_len = skb_tail_pointer(skb) - b;
1da177e4 LT	362	return skb->len;
	363
	364	rtattr_failure:
dc5fc579	365	nlmsg_trim(skb, b);
1da177e4 LT	366	return -1;
	367	}
	368
	369	static struct Qdisc_class_ops ingress_class_ops = {
	370	.graft = ingress_graft,
	371	.leaf = ingress_leaf,
	372	.get = ingress_get,
	373	.put = ingress_put,
	374	.change = ingress_change,
	375	.delete = NULL,
	376	.walk = ingress_walk,
	377	.tcf_chain = ingress_find_tcf,
	378	.bind_tcf = ingress_bind_filter,
	379	.unbind_tcf = ingress_put,
	380	.dump = NULL,
	381	};
	382
	383	static struct Qdisc_ops ingress_qdisc_ops = {
	384	.next = NULL,
	385	.cl_ops = &ingress_class_ops,
	386	.id = "ingress",
	387	.priv_size = sizeof(struct ingress_qdisc_data),
	388	.enqueue = ingress_enqueue,
	389	.dequeue = ingress_dequeue,
	390	.requeue = ingress_requeue,
	391	.drop = ingress_drop,
	392	.init = ingress_init,
	393	.reset = ingress_reset,
	394	.destroy = ingress_destroy,
	395	.change = NULL,
	396	.dump = ingress_dump,
	397	.owner = THIS_MODULE,
	398	};
	399
	400	static int __init ingress_module_init(void)
	401	{
	402	int ret = 0;
	403
	404	if ((ret = register_qdisc(&ingress_qdisc_ops)) < 0) {
	405	printk("Unable to register Ingress qdisc\n");
	406	return ret;
	407	}
	408
	409	return ret;
	410	}
10297b99	411	static void __exit ingress_module_exit(void)
1da177e4 LT	412	{
	413	unregister_qdisc(&ingress_qdisc_ops);
	414	#ifndef CONFIG_NET_CLS_ACT
	415	#ifdef CONFIG_NETFILTER
	416	if (nf_registered) {
	417	nf_unregister_hook(&ing_ops);
	418	if (nf_registered > 1)
	419	nf_unregister_hook(&ing6_ops);
	420	}
	421	#endif
	422	#endif
	423	}
	424	module_init(ingress_module_init)
	425	module_exit(ingress_module_exit)
	426	MODULE_LICENSE("GPL");