[deliverable/linux.git] / net / sched / cls_fw.c

/*
 * net/sched/cls_fw.c	Classifier mapping ipchains' fwmark to traffic class.
 *
 *		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:	Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
 *
 * Changes:
 * Karlis Peisenieks <karlis@mt.lv> : 990415 : fw_walk off by one
 * Karlis Peisenieks <karlis@mt.lv> : 990415 : fw_delete killed all the filter (and kernel).
 * Alex <alex@pilotsoft.com> : 2004xxyy: Added Action extension
 *
 * JHS: We should remove the CONFIG_NET_CLS_IND from here
 * eventually when the meta match extension is made available
 *
 */

#include <linux/module.h>
#include <linux/slab.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/skbuff.h>
#include <net/netlink.h>
#include <net/act_api.h>
#include <net/pkt_cls.h>

#define HTSIZE 256

struct fw_head {
	u32			mask;
	bool			mask_set;
	struct fw_filter __rcu	*ht[HTSIZE];
	struct rcu_head		rcu;
};

struct fw_filter {
	struct fw_filter __rcu	*next;
	u32			id;
	struct tcf_result	res;
#ifdef CONFIG_NET_CLS_IND
	int			ifindex;
#endif /* CONFIG_NET_CLS_IND */
	struct tcf_exts		exts;
	struct tcf_proto	*tp;
	struct rcu_head		rcu;
};

static u32 fw_hash(u32 handle)
{
	handle ^= (handle >> 16);
	handle ^= (handle >> 8);
	return handle % HTSIZE;
}

static int fw_classify(struct sk_buff *skb, const struct tcf_proto *tp,
			  struct tcf_result *res)
{
	struct fw_head *head = rcu_dereference_bh(tp->root);
	struct fw_filter *f;
	int r;
	u32 id = skb->mark;

	if (head != NULL) {
		id &= head->mask;

		for (f = rcu_dereference_bh(head->ht[fw_hash(id)]); f;
		     f = rcu_dereference_bh(f->next)) {
			if (f->id == id) {
				*res = f->res;
#ifdef CONFIG_NET_CLS_IND
				if (!tcf_match_indev(skb, f->ifindex))
					continue;
#endif /* CONFIG_NET_CLS_IND */
				r = tcf_exts_exec(skb, &f->exts, res);
				if (r < 0)
					continue;

				return r;
			}
		}
	} else {
		/* old method */
		if (id && (TC_H_MAJ(id) == 0 ||
			   !(TC_H_MAJ(id ^ tp->q->handle)))) {
			res->classid = id;
			res->class = 0;
			return 0;
		}
	}

	return -1;
}

static unsigned long fw_get(struct tcf_proto *tp, u32 handle)
{
	struct fw_head *head = rtnl_dereference(tp->root);
	struct fw_filter *f;

	if (head == NULL)
		return 0;

	f = rtnl_dereference(head->ht[fw_hash(handle)]);
	for (; f; f = rtnl_dereference(f->next)) {
		if (f->id == handle)
			return (unsigned long)f;
	}
	return 0;
}

static int fw_init(struct tcf_proto *tp)
{
	struct fw_head *head;

	head = kzalloc(sizeof(struct fw_head), GFP_KERNEL);
	if (head == NULL)
		return -ENOBUFS;

	head->mask_set = false;
	rcu_assign_pointer(tp->root, head);
	return 0;
}

static void fw_delete_filter(struct rcu_head *head)
{
	struct fw_filter *f = container_of(head, struct fw_filter, rcu);

	tcf_exts_destroy(&f->exts);
	kfree(f);
}

static void fw_destroy(struct tcf_proto *tp)
{
	struct fw_head *head = rtnl_dereference(tp->root);
	struct fw_filter *f;
	int h;

	if (head == NULL)
		return;

	for (h = 0; h < HTSIZE; h++) {
		while ((f = rtnl_dereference(head->ht[h])) != NULL) {
			RCU_INIT_POINTER(head->ht[h],
					 rtnl_dereference(f->next));
			tcf_unbind_filter(tp, &f->res);
			call_rcu(&f->rcu, fw_delete_filter);
		}
	}
	RCU_INIT_POINTER(tp->root, NULL);
	kfree_rcu(head, rcu);
}

static int fw_delete(struct tcf_proto *tp, unsigned long arg)
{
	struct fw_head *head = rtnl_dereference(tp->root);
	struct fw_filter *f = (struct fw_filter *)arg;
	struct fw_filter __rcu **fp;
	struct fw_filter *pfp;

	if (head == NULL || f == NULL)
		goto out;

	fp = &head->ht[fw_hash(f->id)];

	for (pfp = rtnl_dereference(*fp); pfp;
	     fp = &pfp->next, pfp = rtnl_dereference(*fp)) {
		if (pfp == f) {
			RCU_INIT_POINTER(*fp, rtnl_dereference(f->next));
			tcf_unbind_filter(tp, &f->res);
			call_rcu(&f->rcu, fw_delete_filter);
			return 0;
		}
	}
out:
	return -EINVAL;
}

static const struct nla_policy fw_policy[TCA_FW_MAX + 1] = {
	[TCA_FW_CLASSID]	= { .type = NLA_U32 },
	[TCA_FW_INDEV]		= { .type = NLA_STRING, .len = IFNAMSIZ },
	[TCA_FW_MASK]		= { .type = NLA_U32 },
};

static int
fw_change_attrs(struct net *net, struct tcf_proto *tp, struct fw_filter *f,
	struct nlattr **tb, struct nlattr **tca, unsigned long base, bool ovr)
{
	struct fw_head *head = rtnl_dereference(tp->root);
	struct tcf_exts e;
	u32 mask;
	int err;

	tcf_exts_init(&e, TCA_FW_ACT, TCA_FW_POLICE);
	err = tcf_exts_validate(net, tp, tb, tca[TCA_RATE], &e, ovr);
	if (err < 0)
		return err;

	if (tb[TCA_FW_CLASSID]) {
		f->res.classid = nla_get_u32(tb[TCA_FW_CLASSID]);
		tcf_bind_filter(tp, &f->res, base);
	}

#ifdef CONFIG_NET_CLS_IND
	if (tb[TCA_FW_INDEV]) {
		int ret;
		ret = tcf_change_indev(net, tb[TCA_FW_INDEV]);
		if (ret < 0) {
			err = ret;
			goto errout;
		}
		f->ifindex = ret;
	}
#endif /* CONFIG_NET_CLS_IND */

	err = -EINVAL;
	if (tb[TCA_FW_MASK]) {
		mask = nla_get_u32(tb[TCA_FW_MASK]);
		if (mask != head->mask)
			goto errout;
	} else if (head->mask != 0xFFFFFFFF)
		goto errout;

	tcf_exts_change(tp, &f->exts, &e);

	return 0;
errout:
	tcf_exts_destroy(&e);
	return err;
}

static int fw_change(struct net *net, struct sk_buff *in_skb,
		     struct tcf_proto *tp, unsigned long base,
		     u32 handle,
		     struct nlattr **tca,
		     unsigned long *arg, bool ovr)
{
	struct fw_head *head = rtnl_dereference(tp->root);
	struct fw_filter *f = (struct fw_filter *) *arg;
	struct nlattr *opt = tca[TCA_OPTIONS];
	struct nlattr *tb[TCA_FW_MAX + 1];
	int err;

	if (!opt)
		return handle ? -EINVAL : 0;

	err = nla_parse_nested(tb, TCA_FW_MAX, opt, fw_policy);
	if (err < 0)
		return err;

	if (f) {
		struct fw_filter *pfp, *fnew;
		struct fw_filter __rcu **fp;

		if (f->id != handle && handle)
			return -EINVAL;

		fnew = kzalloc(sizeof(struct fw_filter), GFP_KERNEL);
		if (!fnew)
			return -ENOBUFS;

		fnew->id = f->id;
		fnew->res = f->res;
#ifdef CONFIG_NET_CLS_IND
		fnew->ifindex = f->ifindex;
#endif /* CONFIG_NET_CLS_IND */
		fnew->tp = f->tp;

		tcf_exts_init(&fnew->exts, TCA_FW_ACT, TCA_FW_POLICE);

		err = fw_change_attrs(net, tp, fnew, tb, tca, base, ovr);
		if (err < 0) {
			kfree(fnew);
			return err;
		}

		fp = &head->ht[fw_hash(fnew->id)];
		for (pfp = rtnl_dereference(*fp); pfp;
		     fp = &pfp->next, pfp = rtnl_dereference(*fp))
			if (pfp == f)
				break;

		RCU_INIT_POINTER(fnew->next, rtnl_dereference(pfp->next));
		rcu_assign_pointer(*fp, fnew);
		tcf_unbind_filter(tp, &f->res);
		call_rcu(&f->rcu, fw_delete_filter);

		*arg = (unsigned long)fnew;
		return err;
	}

	if (!handle)
		return -EINVAL;

	if (!head->mask_set) {
		head->mask = 0xFFFFFFFF;
		if (tb[TCA_FW_MASK])
			head->mask = nla_get_u32(tb[TCA_FW_MASK]);
		head->mask_set = true;
	}

	f = kzalloc(sizeof(struct fw_filter), GFP_KERNEL);
	if (f == NULL)
		return -ENOBUFS;

	tcf_exts_init(&f->exts, TCA_FW_ACT, TCA_FW_POLICE);
	f->id = handle;
	f->tp = tp;

	err = fw_change_attrs(net, tp, f, tb, tca, base, ovr);
	if (err < 0)
		goto errout;

	RCU_INIT_POINTER(f->next, head->ht[fw_hash(handle)]);
	rcu_assign_pointer(head->ht[fw_hash(handle)], f);

	*arg = (unsigned long)f;
	return 0;

errout:
	kfree(f);
	return err;
}

static void fw_walk(struct tcf_proto *tp, struct tcf_walker *arg)
{
	struct fw_head *head = rtnl_dereference(tp->root);
	int h;

	if (head == NULL)
		arg->stop = 1;

	if (arg->stop)
		return;

	for (h = 0; h < HTSIZE; h++) {
		struct fw_filter *f;

		for (f = rtnl_dereference(head->ht[h]); f;
		     f = rtnl_dereference(f->next)) {
			if (arg->count < arg->skip) {
				arg->count++;
				continue;
			}
			if (arg->fn(tp, (unsigned long)f, arg) < 0) {
				arg->stop = 1;
				return;
			}
			arg->count++;
		}
	}
}

static int fw_dump(struct net *net, struct tcf_proto *tp, unsigned long fh,
		   struct sk_buff *skb, struct tcmsg *t)
{
	struct fw_head *head = rtnl_dereference(tp->root);
	struct fw_filter *f = (struct fw_filter *)fh;
	struct nlattr *nest;

	if (f == NULL)
		return skb->len;

	t->tcm_handle = f->id;

	if (!f->res.classid && !tcf_exts_is_available(&f->exts))
		return skb->len;

	nest = nla_nest_start(skb, TCA_OPTIONS);
	if (nest == NULL)
		goto nla_put_failure;

	if (f->res.classid &&
	    nla_put_u32(skb, TCA_FW_CLASSID, f->res.classid))
		goto nla_put_failure;
#ifdef CONFIG_NET_CLS_IND
	if (f->ifindex) {
		struct net_device *dev;
		dev = __dev_get_by_index(net, f->ifindex);
		if (dev && nla_put_string(skb, TCA_FW_INDEV, dev->name))
			goto nla_put_failure;
	}
#endif /* CONFIG_NET_CLS_IND */
	if (head->mask != 0xFFFFFFFF &&
	    nla_put_u32(skb, TCA_FW_MASK, head->mask))
		goto nla_put_failure;

	if (tcf_exts_dump(skb, &f->exts) < 0)
		goto nla_put_failure;

	nla_nest_end(skb, nest);

	if (tcf_exts_dump_stats(skb, &f->exts) < 0)
		goto nla_put_failure;

	return skb->len;

nla_put_failure:
	nla_nest_cancel(skb, nest);
	return -1;
}

static struct tcf_proto_ops cls_fw_ops __read_mostly = {
	.kind		=	"fw",
	.classify	=	fw_classify,
	.init		=	fw_init,
	.destroy	=	fw_destroy,
	.get		=	fw_get,
	.change		=	fw_change,
	.delete		=	fw_delete,
	.walk		=	fw_walk,
	.dump		=	fw_dump,
	.owner		=	THIS_MODULE,
};

static int __init init_fw(void)
{
	return register_tcf_proto_ops(&cls_fw_ops);
}

static void __exit exit_fw(void)
{
	unregister_tcf_proto_ops(&cls_fw_ops);
}

module_init(init_fw)
module_exit(exit_fw)
MODULE_LICENSE("GPL");
Commit	Line	Data
	1	/*
	2	* net/sched/cls_fw.c Classifier mapping ipchains' fwmark to traffic class.
	3	*
	4	* This program is free software; you can redistribute it and/or
	5	* modify it under the terms of the GNU General Public License
	6	* as published by the Free Software Foundation; either version
	7	* 2 of the License, or (at your option) any later version.
	8	*
	9	* Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
	10	*
	11	* Changes:
	12	* Karlis Peisenieks <karlis@mt.lv> : 990415 : fw_walk off by one
	13	* Karlis Peisenieks <karlis@mt.lv> : 990415 : fw_delete killed all the filter (and kernel).
	14	* Alex <alex@pilotsoft.com> : 2004xxyy: Added Action extension
	15	*
	16	* JHS: We should remove the CONFIG_NET_CLS_IND from here
	17	* eventually when the meta match extension is made available
	18	*
	19	*/
	20
	21	#include <linux/module.h>
	22	#include <linux/slab.h>
	23	#include <linux/types.h>
	24	#include <linux/kernel.h>
	25	#include <linux/string.h>
	26	#include <linux/errno.h>
	27	#include <linux/skbuff.h>
	28	#include <net/netlink.h>
	29	#include <net/act_api.h>
	30	#include <net/pkt_cls.h>
	31
	32	#define HTSIZE 256
	33
	34	struct fw_head {
	35	u32 mask;
	36	bool mask_set;
	37	struct fw_filter __rcu *ht[HTSIZE];
	38	struct rcu_head rcu;
	39	};
	40
	41	struct fw_filter {
	42	struct fw_filter __rcu *next;
	43	u32 id;
	44	struct tcf_result res;
	45	#ifdef CONFIG_NET_CLS_IND
	46	int ifindex;
	47	#endif /* CONFIG_NET_CLS_IND */
	48	struct tcf_exts exts;
	49	struct tcf_proto *tp;
	50	struct rcu_head rcu;
	51	};
	52
	53	static u32 fw_hash(u32 handle)
	54	{
	55	handle ^= (handle >> 16);
	56	handle ^= (handle >> 8);
	57	return handle % HTSIZE;
	58	}
	59
	60	static int fw_classify(struct sk_buff skb, const struct tcf_proto tp,
	61	struct tcf_result *res)
	62	{
	63	struct fw_head *head = rcu_dereference_bh(tp->root);
	64	struct fw_filter *f;
	65	int r;
	66	u32 id = skb->mark;
	67
	68	if (head != NULL) {
	69	id &= head->mask;
	70
	71	for (f = rcu_dereference_bh(head->ht[fw_hash(id)]); f;
	72	f = rcu_dereference_bh(f->next)) {
	73	if (f->id == id) {
	74	*res = f->res;
	75	#ifdef CONFIG_NET_CLS_IND
	76	if (!tcf_match_indev(skb, f->ifindex))
	77	continue;
	78	#endif /* CONFIG_NET_CLS_IND */
	79	r = tcf_exts_exec(skb, &f->exts, res);
	80	if (r < 0)
	81	continue;
	82
	83	return r;
	84	}
	85	}
	86	} else {
	87	/* old method */
	88	if (id && (TC_H_MAJ(id) == 0 \|\|
	89	!(TC_H_MAJ(id ^ tp->q->handle)))) {
	90	res->classid = id;
	91	res->class = 0;
	92	return 0;
	93	}
	94	}
	95
	96	return -1;
	97	}
	98
	99	static unsigned long fw_get(struct tcf_proto *tp, u32 handle)
	100	{
	101	struct fw_head *head = rtnl_dereference(tp->root);
	102	struct fw_filter *f;
	103
	104	if (head == NULL)
	105	return 0;
	106
	107	f = rtnl_dereference(head->ht[fw_hash(handle)]);
	108	for (; f; f = rtnl_dereference(f->next)) {
	109	if (f->id == handle)
	110	return (unsigned long)f;
	111	}
	112	return 0;
	113	}
	114
	115	static int fw_init(struct tcf_proto *tp)
	116	{
	117	struct fw_head *head;
	118
	119	head = kzalloc(sizeof(struct fw_head), GFP_KERNEL);
	120	if (head == NULL)
	121	return -ENOBUFS;
	122
	123	head->mask_set = false;
	124	rcu_assign_pointer(tp->root, head);
	125	return 0;
	126	}
	127
	128	static void fw_delete_filter(struct rcu_head *head)
	129	{
	130	struct fw_filter *f = container_of(head, struct fw_filter, rcu);
	131
	132	tcf_exts_destroy(&f->exts);
	133	kfree(f);
	134	}
	135
	136	static void fw_destroy(struct tcf_proto *tp)
	137	{
	138	struct fw_head *head = rtnl_dereference(tp->root);
	139	struct fw_filter *f;
	140	int h;
	141
	142	if (head == NULL)
	143	return;
	144
	145	for (h = 0; h < HTSIZE; h++) {
	146	while ((f = rtnl_dereference(head->ht[h])) != NULL) {
	147	RCU_INIT_POINTER(head->ht[h],
	148	rtnl_dereference(f->next));
	149	tcf_unbind_filter(tp, &f->res);
	150	call_rcu(&f->rcu, fw_delete_filter);
	151	}
	152	}
	153	RCU_INIT_POINTER(tp->root, NULL);
	154	kfree_rcu(head, rcu);
	155	}
	156
	157	static int fw_delete(struct tcf_proto *tp, unsigned long arg)
	158	{
	159	struct fw_head *head = rtnl_dereference(tp->root);
	160	struct fw_filter f = (struct fw_filter )arg;
	161	struct fw_filter __rcu **fp;
	162	struct fw_filter *pfp;
	163
	164	if (head == NULL \|\| f == NULL)
	165	goto out;
	166
	167	fp = &head->ht[fw_hash(f->id)];
	168
	169	for (pfp = rtnl_dereference(*fp); pfp;
	170	fp = &pfp->next, pfp = rtnl_dereference(*fp)) {
	171	if (pfp == f) {
	172	RCU_INIT_POINTER(*fp, rtnl_dereference(f->next));
	173	tcf_unbind_filter(tp, &f->res);
	174	call_rcu(&f->rcu, fw_delete_filter);
	175	return 0;
	176	}
	177	}
	178	out:
	179	return -EINVAL;
	180	}
	181
	182	static const struct nla_policy fw_policy[TCA_FW_MAX + 1] = {
	183	[TCA_FW_CLASSID] = { .type = NLA_U32 },
	184	[TCA_FW_INDEV] = { .type = NLA_STRING, .len = IFNAMSIZ },
	185	[TCA_FW_MASK] = { .type = NLA_U32 },
	186	};
	187
	188	static int
	189	fw_change_attrs(struct net net, struct tcf_proto tp, struct fw_filter *f,
	190	struct nlattr tb, struct nlattr tca, unsigned long base, bool ovr)
	191	{
	192	struct fw_head *head = rtnl_dereference(tp->root);
	193	struct tcf_exts e;
	194	u32 mask;
	195	int err;
	196
	197	tcf_exts_init(&e, TCA_FW_ACT, TCA_FW_POLICE);
	198	err = tcf_exts_validate(net, tp, tb, tca[TCA_RATE], &e, ovr);
	199	if (err < 0)
	200	return err;
	201
	202	if (tb[TCA_FW_CLASSID]) {
	203	f->res.classid = nla_get_u32(tb[TCA_FW_CLASSID]);
	204	tcf_bind_filter(tp, &f->res, base);
	205	}
	206
	207	#ifdef CONFIG_NET_CLS_IND
	208	if (tb[TCA_FW_INDEV]) {
	209	int ret;
	210	ret = tcf_change_indev(net, tb[TCA_FW_INDEV]);
	211	if (ret < 0) {
	212	err = ret;
	213	goto errout;
	214	}
	215	f->ifindex = ret;
	216	}
	217	#endif /* CONFIG_NET_CLS_IND */
	218
	219	err = -EINVAL;
	220	if (tb[TCA_FW_MASK]) {
	221	mask = nla_get_u32(tb[TCA_FW_MASK]);
	222	if (mask != head->mask)
	223	goto errout;
	224	} else if (head->mask != 0xFFFFFFFF)
	225	goto errout;
	226
	227	tcf_exts_change(tp, &f->exts, &e);
	228
	229	return 0;
	230	errout:
	231	tcf_exts_destroy(&e);
	232	return err;
	233	}
	234
	235	static int fw_change(struct net net, struct sk_buff in_skb,
	236	struct tcf_proto *tp, unsigned long base,
	237	u32 handle,
	238	struct nlattr **tca,
	239	unsigned long *arg, bool ovr)
	240	{
	241	struct fw_head *head = rtnl_dereference(tp->root);
	242	struct fw_filter f = (struct fw_filter ) *arg;
	243	struct nlattr *opt = tca[TCA_OPTIONS];
	244	struct nlattr *tb[TCA_FW_MAX + 1];
	245	int err;
	246
	247	if (!opt)
	248	return handle ? -EINVAL : 0;
	249
	250	err = nla_parse_nested(tb, TCA_FW_MAX, opt, fw_policy);
	251	if (err < 0)
	252	return err;
	253
	254	if (f) {
	255	struct fw_filter pfp, fnew;
	256	struct fw_filter __rcu **fp;
	257
	258	if (f->id != handle && handle)
	259	return -EINVAL;
	260
	261	fnew = kzalloc(sizeof(struct fw_filter), GFP_KERNEL);
	262	if (!fnew)
	263	return -ENOBUFS;
	264
	265	fnew->id = f->id;
	266	fnew->res = f->res;
	267	#ifdef CONFIG_NET_CLS_IND
	268	fnew->ifindex = f->ifindex;
	269	#endif /* CONFIG_NET_CLS_IND */
	270	fnew->tp = f->tp;
	271
	272	tcf_exts_init(&fnew->exts, TCA_FW_ACT, TCA_FW_POLICE);
	273
	274	err = fw_change_attrs(net, tp, fnew, tb, tca, base, ovr);
	275	if (err < 0) {
	276	kfree(fnew);
	277	return err;
	278	}
	279
	280	fp = &head->ht[fw_hash(fnew->id)];
	281	for (pfp = rtnl_dereference(*fp); pfp;
	282	fp = &pfp->next, pfp = rtnl_dereference(*fp))
	283	if (pfp == f)
	284	break;
	285
	286	RCU_INIT_POINTER(fnew->next, rtnl_dereference(pfp->next));
	287	rcu_assign_pointer(*fp, fnew);
	288	tcf_unbind_filter(tp, &f->res);
	289	call_rcu(&f->rcu, fw_delete_filter);
	290
	291	*arg = (unsigned long)fnew;
	292	return err;
	293	}
	294
	295	if (!handle)
	296	return -EINVAL;
	297
	298	if (!head->mask_set) {
	299	head->mask = 0xFFFFFFFF;
	300	if (tb[TCA_FW_MASK])
	301	head->mask = nla_get_u32(tb[TCA_FW_MASK]);
	302	head->mask_set = true;
	303	}
	304
	305	f = kzalloc(sizeof(struct fw_filter), GFP_KERNEL);
	306	if (f == NULL)
	307	return -ENOBUFS;
	308
	309	tcf_exts_init(&f->exts, TCA_FW_ACT, TCA_FW_POLICE);
	310	f->id = handle;
	311	f->tp = tp;
	312
	313	err = fw_change_attrs(net, tp, f, tb, tca, base, ovr);
	314	if (err < 0)
	315	goto errout;
	316
	317	RCU_INIT_POINTER(f->next, head->ht[fw_hash(handle)]);
	318	rcu_assign_pointer(head->ht[fw_hash(handle)], f);
	319
	320	*arg = (unsigned long)f;
	321	return 0;
	322
	323	errout:
	324	kfree(f);
	325	return err;
	326	}
	327
	328	static void fw_walk(struct tcf_proto tp, struct tcf_walker arg)
	329	{
	330	struct fw_head *head = rtnl_dereference(tp->root);
	331	int h;
	332
	333	if (head == NULL)
	334	arg->stop = 1;
	335
	336	if (arg->stop)
	337	return;
	338
	339	for (h = 0; h < HTSIZE; h++) {
	340	struct fw_filter *f;
	341
	342	for (f = rtnl_dereference(head->ht[h]); f;
	343	f = rtnl_dereference(f->next)) {
	344	if (arg->count < arg->skip) {
	345	arg->count++;
	346	continue;
	347	}
	348	if (arg->fn(tp, (unsigned long)f, arg) < 0) {
	349	arg->stop = 1;
	350	return;
	351	}
	352	arg->count++;
	353	}
	354	}
	355	}
	356
	357	static int fw_dump(struct net net, struct tcf_proto tp, unsigned long fh,
	358	struct sk_buff skb, struct tcmsg t)
	359	{
	360	struct fw_head *head = rtnl_dereference(tp->root);
	361	struct fw_filter f = (struct fw_filter )fh;
	362	struct nlattr *nest;
	363
	364	if (f == NULL)
	365	return skb->len;
	366
	367	t->tcm_handle = f->id;
	368
	369	if (!f->res.classid && !tcf_exts_is_available(&f->exts))
	370	return skb->len;
	371
	372	nest = nla_nest_start(skb, TCA_OPTIONS);
	373	if (nest == NULL)
	374	goto nla_put_failure;
	375
	376	if (f->res.classid &&
	377	nla_put_u32(skb, TCA_FW_CLASSID, f->res.classid))
	378	goto nla_put_failure;
	379	#ifdef CONFIG_NET_CLS_IND
	380	if (f->ifindex) {
	381	struct net_device *dev;
	382	dev = __dev_get_by_index(net, f->ifindex);
	383	if (dev && nla_put_string(skb, TCA_FW_INDEV, dev->name))
	384	goto nla_put_failure;
	385	}
	386	#endif /* CONFIG_NET_CLS_IND */
	387	if (head->mask != 0xFFFFFFFF &&
	388	nla_put_u32(skb, TCA_FW_MASK, head->mask))
	389	goto nla_put_failure;
	390
	391	if (tcf_exts_dump(skb, &f->exts) < 0)
	392	goto nla_put_failure;
	393
	394	nla_nest_end(skb, nest);
	395
	396	if (tcf_exts_dump_stats(skb, &f->exts) < 0)
	397	goto nla_put_failure;
	398
	399	return skb->len;
	400
	401	nla_put_failure:
	402	nla_nest_cancel(skb, nest);
	403	return -1;
	404	}
	405
	406	static struct tcf_proto_ops cls_fw_ops __read_mostly = {
	407	.kind = "fw",
	408	.classify = fw_classify,
	409	.init = fw_init,
	410	.destroy = fw_destroy,
	411	.get = fw_get,
	412	.change = fw_change,
	413	.delete = fw_delete,
	414	.walk = fw_walk,
	415	.dump = fw_dump,
	416	.owner = THIS_MODULE,
	417	};
	418
	419	static int __init init_fw(void)
	420	{
	421	return register_tcf_proto_ops(&cls_fw_ops);
	422	}
	423
	424	static void __exit exit_fw(void)
	425	{
	426	unregister_tcf_proto_ops(&cls_fw_ops);
	427	}
	428
	429	module_init(init_fw)
	430	module_exit(exit_fw)
	431	MODULE_LICENSE("GPL");