[linux-2.6-block.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>
#include <net/sch_generic.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;
	union {
		struct work_struct	work;
		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 {
		struct Qdisc *q = tcf_block_q(tp->chain->block);

		/* Old method: classify the packet using its skb mark. */
		if (id && (TC_H_MAJ(id) == 0 ||
			   !(TC_H_MAJ(id ^ q->handle)))) {
			res->classid = id;
			res->class = 0;
			return 0;
		}
	}

	return -1;
}

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

	if (head == NULL)
		return NULL;

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

static int fw_init(struct tcf_proto *tp)
{
	/* We don't allocate fw_head here, because in the old method
	 * we don't need it at all.
	 */
	return 0;
}

static void __fw_delete_filter(struct fw_filter *f)
{
	tcf_exts_destroy(&f->exts);
	tcf_exts_put_net(&f->exts);
	kfree(f);
}

static void fw_delete_filter_work(struct work_struct *work)
{
	struct fw_filter *f = container_of(work, struct fw_filter, work);

	rtnl_lock();
	__fw_delete_filter(f);
	rtnl_unlock();
}

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

	INIT_WORK(&f->work, fw_delete_filter_work);
	tcf_queue_work(&f->work);
}

static void fw_destroy(struct tcf_proto *tp, struct netlink_ext_ack *extack)
{
	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);
			if (tcf_exts_get_net(&f->exts))
				call_rcu(&f->rcu, fw_delete_filter);
			else
				__fw_delete_filter(f);
		}
	}
	kfree_rcu(head, rcu);
}

static int fw_delete(struct tcf_proto *tp, void *arg, bool *last,
		     struct netlink_ext_ack *extack)
{
	struct fw_head *head = rtnl_dereference(tp->root);
	struct fw_filter *f = arg;
	struct fw_filter __rcu **fp;
	struct fw_filter *pfp;
	int ret = -EINVAL;
	int h;

	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);
			tcf_exts_get_net(&f->exts);
			call_rcu(&f->rcu, fw_delete_filter);
			ret = 0;
			break;
		}
	}

	*last = true;
	for (h = 0; h < HTSIZE; h++) {
		if (rcu_access_pointer(head->ht[h])) {
			*last = false;
			break;
		}
	}

out:
	return ret;
}

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

	err = tcf_exts_validate(net, tp, tb, tca[TCA_RATE], &f->exts, ovr,
				extack);
	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], extack);
		if (ret < 0)
			return ret;
		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)
			return err;
	} else if (head->mask != 0xFFFFFFFF)
		return err;

	return 0;
}

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

	if (!opt)
		return handle ? -EINVAL : 0; /* Succeed if it is old method. */

	err = nla_parse_nested(tb, TCA_FW_MAX, opt, fw_policy, NULL);
	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 = tcf_exts_init(&fnew->exts, TCA_FW_ACT, TCA_FW_POLICE);
		if (err < 0) {
			kfree(fnew);
			return err;
		}

		err = fw_set_parms(net, tp, fnew, tb, tca, base, ovr, extack);
		if (err < 0) {
			tcf_exts_destroy(&fnew->exts);
			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);
		tcf_exts_get_net(&f->exts);
		call_rcu(&f->rcu, fw_delete_filter);

		*arg = fnew;
		return err;
	}

	if (!handle)
		return -EINVAL;

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

		head = kzalloc(sizeof(*head), GFP_KERNEL);
		if (!head)
			return -ENOBUFS;
		head->mask = mask;

		rcu_assign_pointer(tp->root, head);
	}

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

	err = tcf_exts_init(&f->exts, TCA_FW_ACT, TCA_FW_POLICE);
	if (err < 0)
		goto errout;
	f->id = handle;
	f->tp = tp;

	err = fw_set_parms(net, tp, f, tb, tca, base, ovr, extack);
	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 = f;
	return 0;

errout:
	tcf_exts_destroy(&f->exts);
	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, f, arg) < 0) {
				arg->stop = 1;
				return;
			}
			arg->count++;
		}
	}
}

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

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

	t->tcm_handle = f->id;

	if (!f->res.classid && !tcf_exts_has_actions(&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 void fw_bind_class(void *fh, u32 classid, unsigned long cl)
{
	struct fw_filter *f = fh;

	if (f && f->res.classid == classid)
		f->res.class = cl;
}

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,
	.bind_class	=	fw_bind_class,
	.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>
1da177e4 LT	30	#include <net/pkt_cls.h>
1abf2720	31	#include <net/sch_generic.h>
1da177e4	32
d37d8ac1	33	#define HTSIZE 256
c5c13faf	34
cc7ec456	35	struct fw_head {
d37d8ac1	36	u32 mask;
e35a8ee5 JF	37	struct fw_filter __rcu *ht[HTSIZE];
e35a8ee5 JF	38	struct rcu_head rcu;
1da177e4 LT	39	};
1da177e4 LT	40
cc7ec456	41	struct fw_filter {
e35a8ee5	42	struct fw_filter __rcu *next;
1da177e4 LT	43	u32 id;
	44	struct tcf_result res;
	45	#ifdef CONFIG_NET_CLS_IND
2519a602	46	int ifindex;
1da177e4 LT	47	#endif /* CONFIG_NET_CLS_IND */
1da177e4 LT	48	struct tcf_exts exts;
e35a8ee5	49	struct tcf_proto *tp;
e071dff2 CW	50	union {
	51	struct work_struct work;
	52	struct rcu_head rcu;
	53	};
1da177e4 LT	54	};
1da177e4 LT	55
d37d8ac1	56	static u32 fw_hash(u32 handle)
1da177e4	57	{
d37d8ac1 ED	58	handle ^= (handle >> 16);
	59	handle ^= (handle >> 8);
	60	return handle % HTSIZE;
1da177e4 LT	61	}
1da177e4 LT	62
dc7f9f6e	63	static int fw_classify(struct sk_buff skb, const struct tcf_proto tp,
5a7a5555	64	struct tcf_result *res)
1da177e4	65	{
e35a8ee5	66	struct fw_head *head = rcu_dereference_bh(tp->root);
1da177e4 LT	67	struct fw_filter *f;
1da177e4 LT	68	int r;
5c804bfd	69	u32 id = skb->mark;
1da177e4 LT	70
1da177e4 LT	71	if (head != NULL) {
5c804bfd	72	id &= head->mask;
e35a8ee5 JF	73
	74	for (f = rcu_dereference_bh(head->ht[fw_hash(id)]); f;
	75	f = rcu_dereference_bh(f->next)) {
1da177e4 LT	76	if (f->id == id) {
	77	*res = f->res;
	78	#ifdef CONFIG_NET_CLS_IND
2519a602	79	if (!tcf_match_indev(skb, f->ifindex))
1da177e4 LT	80	continue;
	81	#endif /* CONFIG_NET_CLS_IND */
	82	r = tcf_exts_exec(skb, &f->exts, res);
	83	if (r < 0)
	84	continue;
	85
	86	return r;
	87	}
	88	}
	89	} else {
1abf2720 JP	90	struct Qdisc *q = tcf_block_q(tp->chain->block);
1abf2720 JP	91
d8aecb10	92	/* Old method: classify the packet using its skb mark. */
cc7ec456	93	if (id && (TC_H_MAJ(id) == 0 \|\|
1abf2720	94	!(TC_H_MAJ(id ^ q->handle)))) {
1da177e4 LT	95	res->classid = id;
	96	res->class = 0;
	97	return 0;
	98	}
	99	}
	100
	101	return -1;
	102	}
	103
8113c095	104	static void fw_get(struct tcf_proto tp, u32 handle)
1da177e4	105	{
e35a8ee5	106	struct fw_head *head = rtnl_dereference(tp->root);
1da177e4 LT	107	struct fw_filter *f;
	108
	109	if (head == NULL)
8113c095	110	return NULL;
1da177e4	111
e35a8ee5 JF	112	f = rtnl_dereference(head->ht[fw_hash(handle)]);
e35a8ee5 JF	113	for (; f; f = rtnl_dereference(f->next)) {
1da177e4	114	if (f->id == handle)
8113c095	115	return f;
1da177e4	116	}
8113c095	117	return NULL;
1da177e4 LT	118	}
1da177e4 LT	119
1da177e4 LT	120	static int fw_init(struct tcf_proto *tp)
1da177e4 LT	121	{
d8aecb10 WC	122	/* We don't allocate fw_head here, because in the old method
	123	* we don't need it at all.
	124	*/
1da177e4 LT	125	return 0;
	126	}
	127
d5f984f5 CW	128	static void __fw_delete_filter(struct fw_filter *f)
	129	{
	130	tcf_exts_destroy(&f->exts);
	131	tcf_exts_put_net(&f->exts);
	132	kfree(f);
	133	}
	134
e071dff2	135	static void fw_delete_filter_work(struct work_struct *work)
1da177e4	136	{
e071dff2	137	struct fw_filter *f = container_of(work, struct fw_filter, work);
e35a8ee5	138
e071dff2	139	rtnl_lock();
d5f984f5	140	__fw_delete_filter(f);
e071dff2 CW	141	rtnl_unlock();
	142	}
	143
	144	static void fw_delete_filter(struct rcu_head *head)
	145	{
	146	struct fw_filter *f = container_of(head, struct fw_filter, rcu);
	147
	148	INIT_WORK(&f->work, fw_delete_filter_work);
	149	tcf_queue_work(&f->work);
1da177e4 LT	150	}
1da177e4 LT	151
715df5ec	152	static void fw_destroy(struct tcf_proto tp, struct netlink_ext_ack extack)
1da177e4	153	{
e35a8ee5	154	struct fw_head *head = rtnl_dereference(tp->root);
1da177e4 LT	155	struct fw_filter *f;
	156	int h;
	157
	158	if (head == NULL)
763dbf63	159	return;
1da177e4	160
cc7ec456	161	for (h = 0; h < HTSIZE; h++) {
e35a8ee5 JF	162	while ((f = rtnl_dereference(head->ht[h])) != NULL) {
	163	RCU_INIT_POINTER(head->ht[h],
	164	rtnl_dereference(f->next));
18cdb37e	165	tcf_unbind_filter(tp, &f->res);
d5f984f5 CW	166	if (tcf_exts_get_net(&f->exts))
	167	call_rcu(&f->rcu, fw_delete_filter);
	168	else
	169	__fw_delete_filter(f);
1da177e4 LT	170	}
1da177e4 LT	171	}
e35a8ee5	172	kfree_rcu(head, rcu);
1da177e4 LT	173	}
1da177e4 LT	174
571acf21 AA	175	static int fw_delete(struct tcf_proto tp, void arg, bool *last,
571acf21 AA	176	struct netlink_ext_ack *extack)
1da177e4	177	{
e35a8ee5	178	struct fw_head *head = rtnl_dereference(tp->root);
8113c095	179	struct fw_filter *f = arg;
e35a8ee5 JF	180	struct fw_filter __rcu **fp;
e35a8ee5 JF	181	struct fw_filter *pfp;
763dbf63 WC	182	int ret = -EINVAL;
763dbf63 WC	183	int h;
1da177e4 LT	184
	185	if (head == NULL \|\| f == NULL)
	186	goto out;
	187
e35a8ee5 JF	188	fp = &head->ht[fw_hash(f->id)];
	189
	190	for (pfp = rtnl_dereference(*fp); pfp;
	191	fp = &pfp->next, pfp = rtnl_dereference(*fp)) {
	192	if (pfp == f) {
	193	RCU_INIT_POINTER(*fp, rtnl_dereference(f->next));
18cdb37e	194	tcf_unbind_filter(tp, &f->res);
d5f984f5	195	tcf_exts_get_net(&f->exts);
e35a8ee5	196	call_rcu(&f->rcu, fw_delete_filter);
763dbf63 WC	197	ret = 0;
763dbf63 WC	198	break;
1da177e4 LT	199	}
1da177e4 LT	200	}
763dbf63 WC	201
	202	*last = true;
	203	for (h = 0; h < HTSIZE; h++) {
	204	if (rcu_access_pointer(head->ht[h])) {
	205	*last = false;
	206	break;
	207	}
	208	}
	209
1da177e4	210	out:
763dbf63	211	return ret;
1da177e4 LT	212	}
1da177e4 LT	213
6fa8c014 PM	214	static const struct nla_policy fw_policy[TCA_FW_MAX + 1] = {
	215	[TCA_FW_CLASSID] = { .type = NLA_U32 },
	216	[TCA_FW_INDEV] = { .type = NLA_STRING, .len = IFNAMSIZ },
	217	[TCA_FW_MASK] = { .type = NLA_U32 },
	218	};
	219
1e5003af JP	220	static int fw_set_parms(struct net net, struct tcf_proto tp,
1e5003af JP	221	struct fw_filter f, struct nlattr *tb,
50a56190 AA	222	struct nlattr **tca, unsigned long base, bool ovr,
50a56190 AA	223	struct netlink_ext_ack *extack)
1da177e4	224	{
e35a8ee5	225	struct fw_head *head = rtnl_dereference(tp->root);
b4e9b520	226	u32 mask;
1da177e4 LT	227	int err;
1da177e4 LT	228
50a56190 AA	229	err = tcf_exts_validate(net, tp, tb, tca[TCA_RATE], &f->exts, ovr,
50a56190 AA	230	extack);
1da177e4 LT	231	if (err < 0)
	232	return err;
	233
add93b61	234	if (tb[TCA_FW_CLASSID]) {
1587bac4	235	f->res.classid = nla_get_u32(tb[TCA_FW_CLASSID]);
1da177e4 LT	236	tcf_bind_filter(tp, &f->res, base);
	237	}
	238
	239	#ifdef CONFIG_NET_CLS_IND
add93b61	240	if (tb[TCA_FW_INDEV]) {
2519a602	241	int ret;
1057c55f	242	ret = tcf_change_indev(net, tb[TCA_FW_INDEV], extack);
94611bff JP	243	if (ret < 0)
94611bff JP	244	return ret;
2519a602	245	f->ifindex = ret;
1da177e4 LT	246	}
	247	#endif /* CONFIG_NET_CLS_IND */
	248
cb95ec62	249	err = -EINVAL;
add93b61	250	if (tb[TCA_FW_MASK]) {
1587bac4	251	mask = nla_get_u32(tb[TCA_FW_MASK]);
b4e9b520	252	if (mask != head->mask)
94611bff	253	return err;
b4e9b520	254	} else if (head->mask != 0xFFFFFFFF)
94611bff	255	return err;
1da177e4 LT	256
1da177e4 LT	257	return 0;
1da177e4 LT	258	}
1da177e4 LT	259
c1b52739	260	static int fw_change(struct net net, struct sk_buff in_skb,
af4c6641	261	struct tcf_proto *tp, unsigned long base,
8113c095	262	u32 handle, struct nlattr tca, void arg,
7306db38	263	bool ovr, struct netlink_ext_ack *extack)
1da177e4	264	{
e35a8ee5	265	struct fw_head *head = rtnl_dereference(tp->root);
8113c095	266	struct fw_filter f = arg;
add93b61 PM	267	struct nlattr *opt = tca[TCA_OPTIONS];
add93b61 PM	268	struct nlattr *tb[TCA_FW_MAX + 1];
1da177e4 LT	269	int err;
	270
	271	if (!opt)
d8aecb10	272	return handle ? -EINVAL : 0; /* Succeed if it is old method. */
1da177e4	273
fceb6435	274	err = nla_parse_nested(tb, TCA_FW_MAX, opt, fw_policy, NULL);
cee63723 PM	275	if (err < 0)
cee63723 PM	276	return err;
1da177e4	277
e35a8ee5 JF	278	if (f) {
	279	struct fw_filter pfp, fnew;
	280	struct fw_filter __rcu **fp;
	281
1da177e4 LT	282	if (f->id != handle && handle)
1da177e4 LT	283	return -EINVAL;
e35a8ee5 JF	284
	285	fnew = kzalloc(sizeof(struct fw_filter), GFP_KERNEL);
	286	if (!fnew)
	287	return -ENOBUFS;
	288
	289	fnew->id = f->id;
	290	fnew->res = f->res;
	291	#ifdef CONFIG_NET_CLS_IND
	292	fnew->ifindex = f->ifindex;
	293	#endif /* CONFIG_NET_CLS_IND */
	294	fnew->tp = f->tp;
	295
b9a24bb7 WC	296	err = tcf_exts_init(&fnew->exts, TCA_FW_ACT, TCA_FW_POLICE);
	297	if (err < 0) {
	298	kfree(fnew);
	299	return err;
	300	}
e1f93eb0	301
50a56190	302	err = fw_set_parms(net, tp, fnew, tb, tca, base, ovr, extack);
e35a8ee5	303	if (err < 0) {
b9a24bb7	304	tcf_exts_destroy(&fnew->exts);
e35a8ee5 JF	305	kfree(fnew);
	306	return err;
	307	}
	308
	309	fp = &head->ht[fw_hash(fnew->id)];
	310	for (pfp = rtnl_dereference(*fp); pfp;
	311	fp = &pfp->next, pfp = rtnl_dereference(*fp))
	312	if (pfp == f)
	313	break;
	314
	315	RCU_INIT_POINTER(fnew->next, rtnl_dereference(pfp->next));
	316	rcu_assign_pointer(*fp, fnew);
18cdb37e	317	tcf_unbind_filter(tp, &f->res);
d5f984f5	318	tcf_exts_get_net(&f->exts);
e35a8ee5 JF	319	call_rcu(&f->rcu, fw_delete_filter);
e35a8ee5 JF	320
8113c095	321	*arg = fnew;
e35a8ee5	322	return err;
1da177e4 LT	323	}
	324
	325	if (!handle)
	326	return -EINVAL;
	327
d8aecb10 WC	328	if (!head) {
d8aecb10 WC	329	u32 mask = 0xFFFFFFFF;
6fa8c014	330	if (tb[TCA_FW_MASK])
d8aecb10 WC	331	mask = nla_get_u32(tb[TCA_FW_MASK]);
	332
	333	head = kzalloc(sizeof(*head), GFP_KERNEL);
	334	if (!head)
	335	return -ENOBUFS;
	336	head->mask = mask;
	337
	338	rcu_assign_pointer(tp->root, head);
1da177e4 LT	339	}
1da177e4 LT	340
0da974f4	341	f = kzalloc(sizeof(struct fw_filter), GFP_KERNEL);
1da177e4 LT	342	if (f == NULL)
1da177e4 LT	343	return -ENOBUFS;
1da177e4	344
b9a24bb7 WC	345	err = tcf_exts_init(&f->exts, TCA_FW_ACT, TCA_FW_POLICE);
	346	if (err < 0)
	347	goto errout;
1da177e4	348	f->id = handle;
e35a8ee5	349	f->tp = tp;
1da177e4	350
50a56190	351	err = fw_set_parms(net, tp, f, tb, tca, base, ovr, extack);
1da177e4 LT	352	if (err < 0)
	353	goto errout;
	354
e35a8ee5 JF	355	RCU_INIT_POINTER(f->next, head->ht[fw_hash(handle)]);
e35a8ee5 JF	356	rcu_assign_pointer(head->ht[fw_hash(handle)], f);
1da177e4	357
8113c095	358	*arg = f;
1da177e4 LT	359	return 0;
	360
	361	errout:
b9a24bb7	362	tcf_exts_destroy(&f->exts);
a51482bd	363	kfree(f);
1da177e4 LT	364	return err;
	365	}
	366
	367	static void fw_walk(struct tcf_proto tp, struct tcf_walker arg)
	368	{
e35a8ee5	369	struct fw_head *head = rtnl_dereference(tp->root);
1da177e4 LT	370	int h;
	371
	372	if (head == NULL)
	373	arg->stop = 1;
	374
	375	if (arg->stop)
	376	return;
	377
c5c13faf	378	for (h = 0; h < HTSIZE; h++) {
1da177e4 LT	379	struct fw_filter *f;
1da177e4 LT	380
e35a8ee5 JF	381	for (f = rtnl_dereference(head->ht[h]); f;
e35a8ee5 JF	382	f = rtnl_dereference(f->next)) {
1da177e4 LT	383	if (arg->count < arg->skip) {
	384	arg->count++;
	385	continue;
	386	}
8113c095	387	if (arg->fn(tp, f, arg) < 0) {
1da177e4 LT	388	arg->stop = 1;
	389	return;
	390	}
	391	arg->count++;
	392	}
	393	}
	394	}
	395
8113c095	396	static int fw_dump(struct net net, struct tcf_proto tp, void *fh,
1da177e4 LT	397	struct sk_buff skb, struct tcmsg t)
1da177e4 LT	398	{
e35a8ee5	399	struct fw_head *head = rtnl_dereference(tp->root);
8113c095	400	struct fw_filter *f = fh;
4b3550ef	401	struct nlattr *nest;
1da177e4 LT	402
	403	if (f == NULL)
	404	return skb->len;
	405
	406	t->tcm_handle = f->id;
	407
6fc6d06e	408	if (!f->res.classid && !tcf_exts_has_actions(&f->exts))
1da177e4 LT	409	return skb->len;
1da177e4 LT	410
4b3550ef PM	411	nest = nla_nest_start(skb, TCA_OPTIONS);
	412	if (nest == NULL)
	413	goto nla_put_failure;
1da177e4	414
1b34ec43 DM	415	if (f->res.classid &&
	416	nla_put_u32(skb, TCA_FW_CLASSID, f->res.classid))
	417	goto nla_put_failure;
1da177e4	418	#ifdef CONFIG_NET_CLS_IND
2519a602 WC	419	if (f->ifindex) {
	420	struct net_device *dev;
	421	dev = __dev_get_by_index(net, f->ifindex);
	422	if (dev && nla_put_string(skb, TCA_FW_INDEV, dev->name))
	423	goto nla_put_failure;
	424	}
1da177e4	425	#endif /* CONFIG_NET_CLS_IND */
1b34ec43 DM	426	if (head->mask != 0xFFFFFFFF &&
	427	nla_put_u32(skb, TCA_FW_MASK, head->mask))
	428	goto nla_put_failure;
1da177e4	429
5da57f42	430	if (tcf_exts_dump(skb, &f->exts) < 0)
add93b61	431	goto nla_put_failure;
1da177e4	432
4b3550ef	433	nla_nest_end(skb, nest);
1da177e4	434
5da57f42	435	if (tcf_exts_dump_stats(skb, &f->exts) < 0)
add93b61	436	goto nla_put_failure;
1da177e4 LT	437
	438	return skb->len;
	439
add93b61	440	nla_put_failure:
6ea3b446	441	nla_nest_cancel(skb, nest);
1da177e4 LT	442	return -1;
	443	}
	444
07d79fc7 CW	445	static void fw_bind_class(void *fh, u32 classid, unsigned long cl)
	446	{
	447	struct fw_filter *f = fh;
	448
	449	if (f && f->res.classid == classid)
	450	f->res.class = cl;
	451	}
	452
2eb9d75c	453	static struct tcf_proto_ops cls_fw_ops __read_mostly = {
1da177e4 LT	454	.kind = "fw",
	455	.classify = fw_classify,
	456	.init = fw_init,
	457	.destroy = fw_destroy,
	458	.get = fw_get,
1da177e4 LT	459	.change = fw_change,
	460	.delete = fw_delete,
	461	.walk = fw_walk,
	462	.dump = fw_dump,
07d79fc7	463	.bind_class = fw_bind_class,
1da177e4 LT	464	.owner = THIS_MODULE,
	465	};
	466
	467	static int __init init_fw(void)
	468	{
	469	return register_tcf_proto_ops(&cls_fw_ops);
	470	}
	471
10297b99	472	static void __exit exit_fw(void)
1da177e4 LT	473	{
	474	unregister_tcf_proto_ops(&cls_fw_ops);
	475	}
	476
	477	module_init(init_fw)
	478	module_exit(exit_fw)
	479	MODULE_LICENSE("GPL");