[linux.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/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);

/* 
revisit later: Use a private since lock dev->queue_lock is also
used on the egress (might slow things for an iota)
*/

	if (dev->qdisc_ingress) {
		spin_lock(&dev->queue_lock);
		if ((q = dev->qdisc_ingress) != NULL)
			fwres = q->enqueue(skb, q);
		spin_unlock(&dev->queue_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);
	struct tcf_proto *tp;

	DPRINTK("ingress_destroy(sch %p,[qdisc %p])\n", sch, p);
	while (p->filter_list) {
		tp = p->filter_list;
		p->filter_list = tp->next;
		tcf_destroy(tp);
	}
#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;
	struct rtattr *rta;

	rta = (struct rtattr *) b;
	RTA_PUT(skb, TCA_OPTIONS, 0, NULL);
	rta->rta_len = skb->tail - b;
	return skb->len;

rtattr_failure:
	skb_trim(skb, b - skb->data);
	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
1da177e4 LT	1	/* net/sched/sch_ingress.c - Ingress qdisc
	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>
	19	#include <net/pkt_sched.h>
	20	#include <asm/byteorder.h>
	21	#include <asm/uaccess.h>
	22	#include <linux/kmod.h>
	23	#include <linux/stat.h>
	24	#include <linux/interrupt.h>
	25	#include <linux/list.h>
	26
	27
	28	#undef DEBUG_INGRESS
	29
	30	#ifdef DEBUG_INGRESS /* control */
	31	#define DPRINTK(format,args...) printk(KERN_DEBUG format,##args)
	32	#else
	33	#define DPRINTK(format,args...)
	34	#endif
	35
	36	#if 0 /* data */
	37	#define D2PRINTK(format,args...) printk(KERN_DEBUG format,##args)
	38	#else
	39	#define D2PRINTK(format,args...)
	40	#endif
	41
	42
	43	#define PRIV(sch) qdisc_priv(sch)
	44
	45
	46	/* Thanks to Doron Oz for this hack
	47	*/
	48	#ifndef CONFIG_NET_CLS_ACT
	49	#ifdef CONFIG_NETFILTER
	50	static int nf_registered;
	51	#endif
	52	#endif
	53
	54	struct ingress_qdisc_data {
	55	struct Qdisc *q;
	56	struct tcf_proto *filter_list;
	57	};
	58
	59
	60	/* ------------------------- Class/flow operations ------------------------- */
	61
	62
	63	static int ingress_graft(struct Qdisc *sch,unsigned long arg,
	64	struct Qdisc new,struct Qdisc *old)
	65	{
	66	#ifdef DEBUG_INGRESS
	67	struct ingress_qdisc_data *p = PRIV(sch);
	68	#endif
	69
	70	DPRINTK("ingress_graft(sch %p,[qdisc %p],new %p,old %p)\n",
	71	sch, p, new, old);
	72	DPRINTK("\n ingress_graft: You cannot add qdiscs to classes");
	73	return 1;
74	}
75
76
77	static struct Qdisc ingress_leaf(struct Qdisc sch, unsigned long arg)
78	{
79	return NULL;
80	}
81
82
83	static unsigned long ingress_get(struct Qdisc *sch,u32 classid)
84	{
85	#ifdef DEBUG_INGRESS
86	struct ingress_qdisc_data *p = PRIV(sch);
87	#endif
88	DPRINTK("ingress_get(sch %p,[qdisc %p],classid %x)\n", sch, p, classid);
89	return TC_H_MIN(classid) + 1;
90	}
91
92
93	static unsigned long ingress_bind_filter(struct Qdisc *sch,
94	unsigned long parent, u32 classid)
95	{
96	return ingress_get(sch, classid);
97	}
98
99
100	static void ingress_put(struct Qdisc *sch, unsigned long cl)
101	{
102	}
103
104
105	static int ingress_change(struct Qdisc *sch, u32 classid, u32 parent,
106	struct rtattr *tca, unsigned long arg)
107	{
108	#ifdef DEBUG_INGRESS
109	struct ingress_qdisc_data *p = PRIV(sch);
110	#endif
111	DPRINTK("ingress_change(sch %p,[qdisc %p],classid %x,parent %x),"
112	"arg 0x%lx\n", sch, p, classid, parent, *arg);
113	DPRINTK("No effect. sch_ingress doesn't maintain classes at the moment");
114	return 0;
115	}
116
117
118
119	static void ingress_walk(struct Qdisc sch,struct qdisc_walker walker)
120	{
121	#ifdef DEBUG_INGRESS
122	struct ingress_qdisc_data *p = PRIV(sch);
123	#endif
124	DPRINTK("ingress_walk(sch %p,[qdisc %p],walker %p)\n", sch, p, walker);
125	DPRINTK("No effect. sch_ingress doesn't maintain classes at the moment");
126	}
127
128
129	static struct tcf_proto *ingress_find_tcf(struct Qdisc sch,unsigned long cl)
130	{
131	struct ingress_qdisc_data *p = PRIV(sch);
132
133	return &p->filter_list;
134	}
135
136
137	/* --------------------------- Qdisc operations ---------------------------- */
138
139
140	static int ingress_enqueue(struct sk_buff skb,struct Qdisc sch)
141	{
142	struct ingress_qdisc_data *p = PRIV(sch);
143	struct tcf_result res;
144	int result;
145
146	D2PRINTK("ingress_enqueue(skb %p,sch %p,[qdisc %p])\n", skb, sch, p);
147	result = tc_classify(skb, p->filter_list, &res);
148	D2PRINTK("result %d class 0x%04x\n", result, res.classid);
149	/*
150	* Unlike normal "enqueue" functions, ingress_enqueue returns a
151	* firewall FW_* code.
152	*/
153	#ifdef CONFIG_NET_CLS_ACT
154	sch->bstats.packets++;
155	sch->bstats.bytes += skb->len;
156	switch (result) {
157	case TC_ACT_SHOT:
158	result = TC_ACT_SHOT;
159	sch->qstats.drops++;
160	break;
161	case TC_ACT_STOLEN:
162	case TC_ACT_QUEUED:
163	result = TC_ACT_STOLEN;
164	break;
165	case TC_ACT_RECLASSIFY:
166	case TC_ACT_OK:
167	case TC_ACT_UNSPEC:
168	default:
169	skb->tc_index = TC_H_MIN(res.classid);
170	result = TC_ACT_OK;
171	break;
172	};
173	/* backward compat */
174	#else
175	#ifdef CONFIG_NET_CLS_POLICE
176	switch (result) {
177	case TC_POLICE_SHOT:
178	result = NF_DROP;
179	sch->qstats.drops++;
180	break;
181	case TC_POLICE_RECLASSIFY: /* DSCP remarking here ? */
182	case TC_POLICE_OK:
183	case TC_POLICE_UNSPEC:
184	default:
185	sch->bstats.packets++;
186	sch->bstats.bytes += skb->len;
187	result = NF_ACCEPT;
188	break;
189	};
190
191	#else
192	D2PRINTK("Overriding result to ACCEPT\n");
193	result = NF_ACCEPT;
194	sch->bstats.packets++;
195	sch->bstats.bytes += skb->len;
196	#endif
197	#endif
198
199	return result;
200	}
201
202
203	static struct sk_buff ingress_dequeue(struct Qdisc sch)
204	{
205	/*
206	struct ingress_qdisc_data *p = PRIV(sch);
207	D2PRINTK("ingress_dequeue(sch %p,[qdisc %p])\n",sch,PRIV(p));
208	*/
209	return NULL;
210	}
211
212
213	static int ingress_requeue(struct sk_buff skb,struct Qdisc sch)
214	{
215	/*
216	struct ingress_qdisc_data *p = PRIV(sch);
217	D2PRINTK("ingress_requeue(skb %p,sch %p,[qdisc %p])\n",skb,sch,PRIV(p));
218	*/
219	return 0;
220	}
221
222	static unsigned int ingress_drop(struct Qdisc *sch)
223	{
224	#ifdef DEBUG_INGRESS
225	struct ingress_qdisc_data *p = PRIV(sch);
226	#endif
227	DPRINTK("ingress_drop(sch %p,[qdisc %p])\n", sch, p);
228	return 0;
229	}
230
231	#ifndef CONFIG_NET_CLS_ACT
232	#ifdef CONFIG_NETFILTER
233	static unsigned int
234	ing_hook(unsigned int hook, struct sk_buff **pskb,
235	const struct net_device *indev,
236	const struct net_device *outdev,
237	int (okfn)(struct sk_buff ))
238	{
239
240	struct Qdisc *q;
241	struct sk_buff skb = pskb;
242	struct net_device *dev = skb->dev;
243	int fwres=NF_ACCEPT;
244
245	DPRINTK("ing_hook: skb %s dev=%s len=%u\n",
246	skb->sk ? "(owned)" : "(unowned)",
247	skb->dev ? (*pskb)->dev->name : "(no dev)",
248	skb->len);
249
250	/*
251	revisit later: Use a private since lock dev->queue_lock is also
252	used on the egress (might slow things for an iota)
253	*/
254
255	if (dev->qdisc_ingress) {
256	spin_lock(&dev->queue_lock);
257	if ((q = dev->qdisc_ingress) != NULL)
258	fwres = q->enqueue(skb, q);
259	spin_unlock(&dev->queue_lock);
260	}
261
262	return fwres;
263	}
264
265	/* after ipt_filter */
266	static struct nf_hook_ops ing_ops = {
267	.hook = ing_hook,
268	.owner = THIS_MODULE,
269	.pf = PF_INET,
270	.hooknum = NF_IP_PRE_ROUTING,
271	.priority = NF_IP_PRI_FILTER + 1,
272	};
273
274	static struct nf_hook_ops ing6_ops = {
275	.hook = ing_hook,
276	.owner = THIS_MODULE,
277	.pf = PF_INET6,
278	.hooknum = NF_IP6_PRE_ROUTING,
279	.priority = NF_IP6_PRI_FILTER + 1,
280	};
281
282	#endif
283	#endif
284
285	static int ingress_init(struct Qdisc sch,struct rtattr opt)
286	{
287	struct ingress_qdisc_data *p = PRIV(sch);
288
289	/* Make sure either netfilter or preferably CLS_ACT is
290	* compiled in */
291	#ifndef CONFIG_NET_CLS_ACT
292	#ifndef CONFIG_NETFILTER
293	printk("You MUST compile classifier actions into the kernel\n");
294	return -EINVAL;
295	#else
296	printk("Ingress scheduler: Classifier actions prefered over netfilter\n");
297	#endif
298	#endif
299
300	#ifndef CONFIG_NET_CLS_ACT
301	#ifdef CONFIG_NETFILTER
302	if (!nf_registered) {
303	if (nf_register_hook(&ing_ops) < 0) {
304	printk("ingress qdisc registration error \n");
305	return -EINVAL;
306	}
307	nf_registered++;
308
309	if (nf_register_hook(&ing6_ops) < 0) {
310	printk("IPv6 ingress qdisc registration error, " \
311	"disabling IPv6 support.\n");
312	} else
313	nf_registered++;
314	}
315	#endif
316	#endif
317
318	DPRINTK("ingress_init(sch %p,[qdisc %p],opt %p)\n",sch,p,opt);
319	p->q = &noop_qdisc;
320	return 0;
321	}
322
323
324	static void ingress_reset(struct Qdisc *sch)
325	{
326	struct ingress_qdisc_data *p = PRIV(sch);
327
328	DPRINTK("ingress_reset(sch %p,[qdisc %p])\n", sch, p);
329
330	/*
331	#if 0
332	*/
333	/* for future use */
334	qdisc_reset(p->q);
335	/*
336	#endif
337	*/
338	}
339
340	/* ------------------------------------------------------------- */
341
342
343	/* ------------------------------------------------------------- */
344
345	static void ingress_destroy(struct Qdisc *sch)
346	{
347	struct ingress_qdisc_data *p = PRIV(sch);
348	struct tcf_proto *tp;
349
350	DPRINTK("ingress_destroy(sch %p,[qdisc %p])\n", sch, p);
351	while (p->filter_list) {
352	tp = p->filter_list;
353	p->filter_list = tp->next;
354	tcf_destroy(tp);
355	}
356	#if 0
357	/* for future use */
358	qdisc_destroy(p->q);
359	#endif
360	}
361
362
363	static int ingress_dump(struct Qdisc sch, struct sk_buff skb)
364	{
365	unsigned char *b = skb->tail;
366	struct rtattr *rta;
367
368	rta = (struct rtattr *) b;
369	RTA_PUT(skb, TCA_OPTIONS, 0, NULL);
370	rta->rta_len = skb->tail - b;
371	return skb->len;
372
373	rtattr_failure:
374	skb_trim(skb, b - skb->data);
375	return -1;
376	}
377
378	static struct Qdisc_class_ops ingress_class_ops = {
379	.graft = ingress_graft,
380	.leaf = ingress_leaf,
381	.get = ingress_get,
382	.put = ingress_put,
383	.change = ingress_change,
384	.delete = NULL,
385	.walk = ingress_walk,
386	.tcf_chain = ingress_find_tcf,
387	.bind_tcf = ingress_bind_filter,
388	.unbind_tcf = ingress_put,
389	.dump = NULL,
390	};
391
392	static struct Qdisc_ops ingress_qdisc_ops = {
393	.next = NULL,
394	.cl_ops = &ingress_class_ops,
395	.id = "ingress",
396	.priv_size = sizeof(struct ingress_qdisc_data),
397	.enqueue = ingress_enqueue,
398	.dequeue = ingress_dequeue,
399	.requeue = ingress_requeue,
400	.drop = ingress_drop,
401	.init = ingress_init,
402	.reset = ingress_reset,
403	.destroy = ingress_destroy,
404	.change = NULL,
405	.dump = ingress_dump,
406	.owner = THIS_MODULE,
407	};
408
409	static int __init ingress_module_init(void)
410	{
411	int ret = 0;
412
413	if ((ret = register_qdisc(&ingress_qdisc_ops)) < 0) {
414	printk("Unable to register Ingress qdisc\n");
415	return ret;
416	}
417
418	return ret;
419	}
420	static void __exit ingress_module_exit(void)
421	{
422	unregister_qdisc(&ingress_qdisc_ops);
423	#ifndef CONFIG_NET_CLS_ACT
424	#ifdef CONFIG_NETFILTER
425	if (nf_registered) {
426	nf_unregister_hook(&ing_ops);
427	if (nf_registered > 1)
428	nf_unregister_hook(&ing6_ops);
429	}
430	#endif
431	#endif
432	}
433	module_init(ingress_module_init)
434	module_exit(ingress_module_exit)
435	MODULE_LICENSE("GPL");