[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;
	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 void fw_put(struct tcf_proto *tp, unsigned long f)
{
}

static int fw_init(struct tcf_proto *tp)
{
	return 0;
}

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

	tcf_unbind_filter(tp, &f->res);
	tcf_exts_destroy(tp, &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));
			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));
			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(tp, &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;

		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);
		call_rcu(&f->rcu, fw_delete_filter);

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

	if (!handle)
		return -EINVAL;

	if (head == NULL) {
		u32 mask = 0xFFFFFFFF;
		if (tb[TCA_FW_MASK])
			mask = nla_get_u32(tb[TCA_FW_MASK]);

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

		rcu_assign_pointer(tp->root, head);
	}

	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;
	unsigned char *b = skb_tail_pointer(skb);
	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:
	nlmsg_trim(skb, b);
	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,
	.put		=	fw_put,
	.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
1da177e4 LT	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
1da177e4	21	#include <linux/module.h>
5a0e3ad6	22	#include <linux/slab.h>
1da177e4 LT	23	#include <linux/types.h>
1da177e4 LT	24	#include <linux/kernel.h>
1da177e4	25	#include <linux/string.h>
1da177e4	26	#include <linux/errno.h>
1da177e4	27	#include <linux/skbuff.h>
0ba48053	28	#include <net/netlink.h>
1da177e4 LT	29	#include <net/act_api.h>
	30	#include <net/pkt_cls.h>
	31
d37d8ac1	32	#define HTSIZE 256
c5c13faf	33
cc7ec456	34	struct fw_head {
d37d8ac1	35	u32 mask;
e35a8ee5 JF	36	struct fw_filter __rcu *ht[HTSIZE];
e35a8ee5 JF	37	struct rcu_head rcu;
1da177e4 LT	38	};
1da177e4 LT	39
cc7ec456	40	struct fw_filter {
e35a8ee5	41	struct fw_filter __rcu *next;
1da177e4 LT	42	u32 id;
	43	struct tcf_result res;
	44	#ifdef CONFIG_NET_CLS_IND
2519a602	45	int ifindex;
1da177e4 LT	46	#endif /* CONFIG_NET_CLS_IND */
1da177e4 LT	47	struct tcf_exts exts;
e35a8ee5 JF	48	struct tcf_proto *tp;
e35a8ee5 JF	49	struct rcu_head rcu;
1da177e4 LT	50	};
1da177e4 LT	51
d37d8ac1	52	static u32 fw_hash(u32 handle)
1da177e4	53	{
d37d8ac1 ED	54	handle ^= (handle >> 16);
	55	handle ^= (handle >> 8);
	56	return handle % HTSIZE;
1da177e4 LT	57	}
1da177e4 LT	58
dc7f9f6e	59	static int fw_classify(struct sk_buff skb, const struct tcf_proto tp,
1da177e4 LT	60	struct tcf_result *res)
1da177e4 LT	61	{
e35a8ee5	62	struct fw_head *head = rcu_dereference_bh(tp->root);
1da177e4 LT	63	struct fw_filter *f;
1da177e4 LT	64	int r;
5c804bfd	65	u32 id = skb->mark;
1da177e4 LT	66
1da177e4 LT	67	if (head != NULL) {
5c804bfd	68	id &= head->mask;
e35a8ee5 JF	69
	70	for (f = rcu_dereference_bh(head->ht[fw_hash(id)]); f;
	71	f = rcu_dereference_bh(f->next)) {
1da177e4 LT	72	if (f->id == id) {
	73	*res = f->res;
	74	#ifdef CONFIG_NET_CLS_IND
2519a602	75	if (!tcf_match_indev(skb, f->ifindex))
1da177e4 LT	76	continue;
	77	#endif /* CONFIG_NET_CLS_IND */
	78	r = tcf_exts_exec(skb, &f->exts, res);
	79	if (r < 0)
	80	continue;
	81
	82	return r;
	83	}
	84	}
	85	} else {
	86	/* old method */
cc7ec456 ED	87	if (id && (TC_H_MAJ(id) == 0 \|\|
cc7ec456 ED	88	!(TC_H_MAJ(id ^ tp->q->handle)))) {
1da177e4 LT	89	res->classid = id;
	90	res->class = 0;
	91	return 0;
	92	}
	93	}
	94
	95	return -1;
	96	}
	97
	98	static unsigned long fw_get(struct tcf_proto *tp, u32 handle)
	99	{
e35a8ee5	100	struct fw_head *head = rtnl_dereference(tp->root);
1da177e4 LT	101	struct fw_filter *f;
	102
	103	if (head == NULL)
	104	return 0;
	105
e35a8ee5 JF	106	f = rtnl_dereference(head->ht[fw_hash(handle)]);
e35a8ee5 JF	107	for (; f; f = rtnl_dereference(f->next)) {
1da177e4 LT	108	if (f->id == handle)
	109	return (unsigned long)f;
	110	}
	111	return 0;
	112	}
	113
	114	static void fw_put(struct tcf_proto *tp, unsigned long f)
	115	{
	116	}
	117
	118	static int fw_init(struct tcf_proto *tp)
	119	{
	120	return 0;
	121	}
	122
e35a8ee5	123	static void fw_delete_filter(struct rcu_head *head)
1da177e4	124	{
e35a8ee5 JF	125	struct fw_filter *f = container_of(head, struct fw_filter, rcu);
	126	struct tcf_proto *tp = f->tp;
	127
1da177e4 LT	128	tcf_unbind_filter(tp, &f->res);
	129	tcf_exts_destroy(tp, &f->exts);
	130	kfree(f);
	131	}
	132
	133	static void fw_destroy(struct tcf_proto *tp)
	134	{
e35a8ee5	135	struct fw_head *head = rtnl_dereference(tp->root);
1da177e4 LT	136	struct fw_filter *f;
	137	int h;
	138
	139	if (head == NULL)
	140	return;
	141
cc7ec456	142	for (h = 0; h < HTSIZE; h++) {
e35a8ee5 JF	143	while ((f = rtnl_dereference(head->ht[h])) != NULL) {
	144	RCU_INIT_POINTER(head->ht[h],
	145	rtnl_dereference(f->next));
	146	call_rcu(&f->rcu, fw_delete_filter);
1da177e4 LT	147	}
1da177e4 LT	148	}
e35a8ee5 JF	149	RCU_INIT_POINTER(tp->root, NULL);
e35a8ee5 JF	150	kfree_rcu(head, rcu);
1da177e4 LT	151	}
	152
	153	static int fw_delete(struct tcf_proto *tp, unsigned long arg)
	154	{
e35a8ee5	155	struct fw_head *head = rtnl_dereference(tp->root);
cc7ec456	156	struct fw_filter f = (struct fw_filter )arg;
e35a8ee5 JF	157	struct fw_filter __rcu **fp;
e35a8ee5 JF	158	struct fw_filter *pfp;
1da177e4 LT	159
	160	if (head == NULL \|\| f == NULL)
	161	goto out;
	162
e35a8ee5 JF	163	fp = &head->ht[fw_hash(f->id)];
	164
	165	for (pfp = rtnl_dereference(*fp); pfp;
	166	fp = &pfp->next, pfp = rtnl_dereference(*fp)) {
	167	if (pfp == f) {
	168	RCU_INIT_POINTER(*fp, rtnl_dereference(f->next));
	169	call_rcu(&f->rcu, fw_delete_filter);
1da177e4 LT	170	return 0;
	171	}
	172	}
	173	out:
	174	return -EINVAL;
	175	}
	176
6fa8c014 PM	177	static const struct nla_policy fw_policy[TCA_FW_MAX + 1] = {
	178	[TCA_FW_CLASSID] = { .type = NLA_U32 },
	179	[TCA_FW_INDEV] = { .type = NLA_STRING, .len = IFNAMSIZ },
	180	[TCA_FW_MASK] = { .type = NLA_U32 },
	181	};
	182
1da177e4	183	static int
c1b52739	184	fw_change_attrs(struct net net, struct tcf_proto tp, struct fw_filter *f,
2f7ef2f8	185	struct nlattr tb, struct nlattr tca, unsigned long base, bool ovr)
1da177e4	186	{
e35a8ee5	187	struct fw_head *head = rtnl_dereference(tp->root);
1da177e4	188	struct tcf_exts e;
b4e9b520	189	u32 mask;
1da177e4 LT	190	int err;
1da177e4 LT	191
5da57f42	192	tcf_exts_init(&e, TCA_FW_ACT, TCA_FW_POLICE);
2f7ef2f8	193	err = tcf_exts_validate(net, tp, tb, tca[TCA_RATE], &e, ovr);
1da177e4 LT	194	if (err < 0)
	195	return err;
	196
add93b61	197	if (tb[TCA_FW_CLASSID]) {
1587bac4	198	f->res.classid = nla_get_u32(tb[TCA_FW_CLASSID]);
1da177e4 LT	199	tcf_bind_filter(tp, &f->res, base);
	200	}
	201
	202	#ifdef CONFIG_NET_CLS_IND
add93b61	203	if (tb[TCA_FW_INDEV]) {
2519a602 WC	204	int ret;
2519a602 WC	205	ret = tcf_change_indev(net, tb[TCA_FW_INDEV]);
722e47d7 WY	206	if (ret < 0) {
722e47d7 WY	207	err = ret;
1da177e4	208	goto errout;
722e47d7	209	}
2519a602	210	f->ifindex = ret;
1da177e4 LT	211	}
	212	#endif /* CONFIG_NET_CLS_IND */
	213
cb95ec62	214	err = -EINVAL;
add93b61	215	if (tb[TCA_FW_MASK]) {
1587bac4	216	mask = nla_get_u32(tb[TCA_FW_MASK]);
b4e9b520 PM	217	if (mask != head->mask)
	218	goto errout;
	219	} else if (head->mask != 0xFFFFFFFF)
	220	goto errout;
	221
1da177e4 LT	222	tcf_exts_change(tp, &f->exts, &e);
	223
	224	return 0;
	225	errout:
	226	tcf_exts_destroy(tp, &e);
	227	return err;
	228	}
	229
c1b52739	230	static int fw_change(struct net net, struct sk_buff in_skb,
af4c6641	231	struct tcf_proto *tp, unsigned long base,
1da177e4	232	u32 handle,
add93b61	233	struct nlattr **tca,
2f7ef2f8	234	unsigned long *arg, bool ovr)
1da177e4	235	{
e35a8ee5	236	struct fw_head *head = rtnl_dereference(tp->root);
1da177e4	237	struct fw_filter f = (struct fw_filter ) *arg;
add93b61 PM	238	struct nlattr *opt = tca[TCA_OPTIONS];
add93b61 PM	239	struct nlattr *tb[TCA_FW_MAX + 1];
1da177e4 LT	240	int err;
	241
	242	if (!opt)
	243	return handle ? -EINVAL : 0;
	244
6fa8c014	245	err = nla_parse_nested(tb, TCA_FW_MAX, opt, fw_policy);
cee63723 PM	246	if (err < 0)
cee63723 PM	247	return err;
1da177e4	248
e35a8ee5 JF	249	if (f) {
	250	struct fw_filter pfp, fnew;
	251	struct fw_filter __rcu **fp;
	252
1da177e4 LT	253	if (f->id != handle && handle)
1da177e4 LT	254	return -EINVAL;
e35a8ee5 JF	255
	256	fnew = kzalloc(sizeof(struct fw_filter), GFP_KERNEL);
	257	if (!fnew)
	258	return -ENOBUFS;
	259
	260	fnew->id = f->id;
	261	fnew->res = f->res;
	262	#ifdef CONFIG_NET_CLS_IND
	263	fnew->ifindex = f->ifindex;
	264	#endif /* CONFIG_NET_CLS_IND */
	265	fnew->tp = f->tp;
	266
	267	err = fw_change_attrs(net, tp, fnew, tb, tca, base, ovr);
	268	if (err < 0) {
	269	kfree(fnew);
	270	return err;
	271	}
	272
	273	fp = &head->ht[fw_hash(fnew->id)];
	274	for (pfp = rtnl_dereference(*fp); pfp;
	275	fp = &pfp->next, pfp = rtnl_dereference(*fp))
	276	if (pfp == f)
	277	break;
	278
	279	RCU_INIT_POINTER(fnew->next, rtnl_dereference(pfp->next));
	280	rcu_assign_pointer(*fp, fnew);
	281	call_rcu(&f->rcu, fw_delete_filter);
	282
	283	*arg = (unsigned long)fnew;
	284	return err;
1da177e4 LT	285	}
	286
	287	if (!handle)
	288	return -EINVAL;
	289
	290	if (head == NULL) {
b4e9b520	291	u32 mask = 0xFFFFFFFF;
6fa8c014	292	if (tb[TCA_FW_MASK])
1587bac4	293	mask = nla_get_u32(tb[TCA_FW_MASK]);
b4e9b520	294
0da974f4	295	head = kzalloc(sizeof(struct fw_head), GFP_KERNEL);
1da177e4 LT	296	if (head == NULL)
1da177e4 LT	297	return -ENOBUFS;
b4e9b520	298	head->mask = mask;
1da177e4	299
e35a8ee5	300	rcu_assign_pointer(tp->root, head);
1da177e4 LT	301	}
1da177e4 LT	302
0da974f4	303	f = kzalloc(sizeof(struct fw_filter), GFP_KERNEL);
1da177e4 LT	304	if (f == NULL)
1da177e4 LT	305	return -ENOBUFS;
1da177e4	306
5da57f42	307	tcf_exts_init(&f->exts, TCA_FW_ACT, TCA_FW_POLICE);
1da177e4	308	f->id = handle;
e35a8ee5	309	f->tp = tp;
1da177e4	310
2f7ef2f8	311	err = fw_change_attrs(net, tp, f, tb, tca, base, ovr);
1da177e4 LT	312	if (err < 0)
	313	goto errout;
	314
e35a8ee5 JF	315	RCU_INIT_POINTER(f->next, head->ht[fw_hash(handle)]);
e35a8ee5 JF	316	rcu_assign_pointer(head->ht[fw_hash(handle)], f);
1da177e4 LT	317
	318	*arg = (unsigned long)f;
	319	return 0;
	320
	321	errout:
a51482bd	322	kfree(f);
1da177e4 LT	323	return err;
	324	}
	325
	326	static void fw_walk(struct tcf_proto tp, struct tcf_walker arg)
	327	{
e35a8ee5	328	struct fw_head *head = rtnl_dereference(tp->root);
1da177e4 LT	329	int h;
	330
	331	if (head == NULL)
	332	arg->stop = 1;
	333
	334	if (arg->stop)
	335	return;
	336
c5c13faf	337	for (h = 0; h < HTSIZE; h++) {
1da177e4 LT	338	struct fw_filter *f;
1da177e4 LT	339
e35a8ee5 JF	340	for (f = rtnl_dereference(head->ht[h]); f;
e35a8ee5 JF	341	f = rtnl_dereference(f->next)) {
1da177e4 LT	342	if (arg->count < arg->skip) {
	343	arg->count++;
	344	continue;
	345	}
	346	if (arg->fn(tp, (unsigned long)f, arg) < 0) {
	347	arg->stop = 1;
	348	return;
	349	}
	350	arg->count++;
	351	}
	352	}
	353	}
	354
832d1d5b	355	static int fw_dump(struct net net, struct tcf_proto tp, unsigned long fh,
1da177e4 LT	356	struct sk_buff skb, struct tcmsg t)
1da177e4 LT	357	{
e35a8ee5	358	struct fw_head *head = rtnl_dereference(tp->root);
cc7ec456	359	struct fw_filter f = (struct fw_filter )fh;
27a884dc	360	unsigned char *b = skb_tail_pointer(skb);
4b3550ef	361	struct nlattr *nest;
1da177e4 LT	362
	363	if (f == NULL)
	364	return skb->len;
	365
	366	t->tcm_handle = f->id;
	367
	368	if (!f->res.classid && !tcf_exts_is_available(&f->exts))
	369	return skb->len;
	370
4b3550ef PM	371	nest = nla_nest_start(skb, TCA_OPTIONS);
	372	if (nest == NULL)
	373	goto nla_put_failure;
1da177e4	374
1b34ec43 DM	375	if (f->res.classid &&
	376	nla_put_u32(skb, TCA_FW_CLASSID, f->res.classid))
	377	goto nla_put_failure;
1da177e4	378	#ifdef CONFIG_NET_CLS_IND
2519a602 WC	379	if (f->ifindex) {
	380	struct net_device *dev;
	381	dev = __dev_get_by_index(net, f->ifindex);
	382	if (dev && nla_put_string(skb, TCA_FW_INDEV, dev->name))
	383	goto nla_put_failure;
	384	}
1da177e4	385	#endif /* CONFIG_NET_CLS_IND */
1b34ec43 DM	386	if (head->mask != 0xFFFFFFFF &&
	387	nla_put_u32(skb, TCA_FW_MASK, head->mask))
	388	goto nla_put_failure;
1da177e4	389
5da57f42	390	if (tcf_exts_dump(skb, &f->exts) < 0)
add93b61	391	goto nla_put_failure;
1da177e4	392
4b3550ef	393	nla_nest_end(skb, nest);
1da177e4	394
5da57f42	395	if (tcf_exts_dump_stats(skb, &f->exts) < 0)
add93b61	396	goto nla_put_failure;
1da177e4 LT	397
	398	return skb->len;
	399
add93b61	400	nla_put_failure:
dc5fc579	401	nlmsg_trim(skb, b);
1da177e4 LT	402	return -1;
	403	}
	404
2eb9d75c	405	static struct tcf_proto_ops cls_fw_ops __read_mostly = {
1da177e4 LT	406	.kind = "fw",
	407	.classify = fw_classify,
	408	.init = fw_init,
	409	.destroy = fw_destroy,
	410	.get = fw_get,
	411	.put = fw_put,
	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
10297b99	424	static void __exit exit_fw(void)
1da177e4 LT	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");