[mirror_ubuntu-eoan-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/config.h>
#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
	10	#include <linux/config.h>
	11	#include <linux/module.h>
	12	#include <linux/types.h>
	13	#include <linux/skbuff.h>
	14	#include <linux/netdevice.h>
	15	#include <linux/rtnetlink.h>
	16	#include <linux/netfilter_ipv4.h>
	17	#include <linux/netfilter_ipv6.h>
	18	#include <linux/netfilter.h>
	19	#include <linux/smp.h>
	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
	51	static int nf_registered;
	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");
74	return 1;
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;
166	case TC_ACT_RECLASSIFY:
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;
173	};
174	/* backward compat */
175	#else
176	#ifdef CONFIG_NET_CLS_POLICE
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;
190	};
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,
236	const struct net_device *indev,
237	const struct net_device *outdev,
238	int (okfn)(struct sk_buff ))
239	{
240
241	struct Qdisc *q;
242	struct sk_buff skb = pskb;
243	struct net_device *dev = skb->dev;
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
251	/*
252	revisit later: Use a private since lock dev->queue_lock is also
253	used on the egress (might slow things for an iota)
254	*/
255
256	if (dev->qdisc_ingress) {
257	spin_lock(&dev->queue_lock);
258	if ((q = dev->qdisc_ingress) != NULL)
259	fwres = q->enqueue(skb, q);
260	spin_unlock(&dev->queue_lock);
261	}
262
263	return fwres;
264	}
265
266	/* after ipt_filter */
267	static struct nf_hook_ops ing_ops = {
268	.hook = ing_hook,
269	.owner = THIS_MODULE,
270	.pf = PF_INET,
271	.hooknum = NF_IP_PRE_ROUTING,
272	.priority = NF_IP_PRI_FILTER + 1,
273	};
274
275	static struct nf_hook_ops ing6_ops = {
276	.hook = ing_hook,
277	.owner = THIS_MODULE,
278	.pf = PF_INET6,
279	.hooknum = NF_IP6_PRE_ROUTING,
280	.priority = NF_IP6_PRI_FILTER + 1,
281	};
282
283	#endif
284	#endif
285
286	static int ingress_init(struct Qdisc sch,struct rtattr opt)
287	{
288	struct ingress_qdisc_data *p = PRIV(sch);
289
290	/* Make sure either netfilter or preferably CLS_ACT is
291	* compiled in */
292	#ifndef CONFIG_NET_CLS_ACT
293	#ifndef CONFIG_NETFILTER
294	printk("You MUST compile classifier actions into the kernel\n");
295	return -EINVAL;
296	#else
297	printk("Ingress scheduler: Classifier actions prefered over netfilter\n");
298	#endif
299	#endif
300
301	#ifndef CONFIG_NET_CLS_ACT
302	#ifdef CONFIG_NETFILTER
303	if (!nf_registered) {
304	if (nf_register_hook(&ing_ops) < 0) {
305	printk("ingress qdisc registration error \n");
306	return -EINVAL;
307	}
308	nf_registered++;
309
310	if (nf_register_hook(&ing6_ops) < 0) {
311	printk("IPv6 ingress qdisc registration error, " \
312	"disabling IPv6 support.\n");
313	} else
314	nf_registered++;
315	}
316	#endif
317	#endif
318
319	DPRINTK("ingress_init(sch %p,[qdisc %p],opt %p)\n",sch,p,opt);
320	p->q = &noop_qdisc;
321	return 0;
322	}
323
324
325	static void ingress_reset(struct Qdisc *sch)
326	{
327	struct ingress_qdisc_data *p = PRIV(sch);
328
329	DPRINTK("ingress_reset(sch %p,[qdisc %p])\n", sch, p);
330
331	/*
332	#if 0
333	*/
334	/* for future use */
335	qdisc_reset(p->q);
336	/*
337	#endif
338	*/
339	}
340
341	/* ------------------------------------------------------------- */
342
343
344	/* ------------------------------------------------------------- */
345
346	static void ingress_destroy(struct Qdisc *sch)
347	{
348	struct ingress_qdisc_data *p = PRIV(sch);
349	struct tcf_proto *tp;
350
351	DPRINTK("ingress_destroy(sch %p,[qdisc %p])\n", sch, p);
352	while (p->filter_list) {
353	tp = p->filter_list;
354	p->filter_list = tp->next;
355	tcf_destroy(tp);
356	}
357	#if 0
358	/* for future use */
359	qdisc_destroy(p->q);
360	#endif
361	}
362
363
364	static int ingress_dump(struct Qdisc sch, struct sk_buff skb)
365	{
366	unsigned char *b = skb->tail;
367	struct rtattr *rta;
368
369	rta = (struct rtattr *) b;
370	RTA_PUT(skb, TCA_OPTIONS, 0, NULL);
371	rta->rta_len = skb->tail - b;
372	return skb->len;
373
374	rtattr_failure:
375	skb_trim(skb, b - skb->data);
376	return -1;
377	}
378
379	static struct Qdisc_class_ops ingress_class_ops = {
380	.graft = ingress_graft,
381	.leaf = ingress_leaf,
382	.get = ingress_get,
383	.put = ingress_put,
384	.change = ingress_change,
385	.delete = NULL,
386	.walk = ingress_walk,
387	.tcf_chain = ingress_find_tcf,
388	.bind_tcf = ingress_bind_filter,
389	.unbind_tcf = ingress_put,
390	.dump = NULL,
391	};
392
393	static struct Qdisc_ops ingress_qdisc_ops = {
394	.next = NULL,
395	.cl_ops = &ingress_class_ops,
396	.id = "ingress",
397	.priv_size = sizeof(struct ingress_qdisc_data),
398	.enqueue = ingress_enqueue,
399	.dequeue = ingress_dequeue,
400	.requeue = ingress_requeue,
401	.drop = ingress_drop,
402	.init = ingress_init,
403	.reset = ingress_reset,
404	.destroy = ingress_destroy,
405	.change = NULL,
406	.dump = ingress_dump,
407	.owner = THIS_MODULE,
408	};
409
410	static int __init ingress_module_init(void)
411	{
412	int ret = 0;
413
414	if ((ret = register_qdisc(&ingress_qdisc_ops)) < 0) {
415	printk("Unable to register Ingress qdisc\n");
416	return ret;
417	}
418
419	return ret;
420	}
421	static void __exit ingress_module_exit(void)
422	{
423	unregister_qdisc(&ingress_qdisc_ops);
424	#ifndef CONFIG_NET_CLS_ACT
425	#ifdef CONFIG_NETFILTER
426	if (nf_registered) {
427	nf_unregister_hook(&ing_ops);
428	if (nf_registered > 1)
429	nf_unregister_hook(&ing6_ops);
430	}
431	#endif
432	#endif
433	}
434	module_init(ingress_module_init)
435	module_exit(ingress_module_exit)
436	MODULE_LICENSE("GPL");