[mirror_ubuntu-bionic-kernel.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 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 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 fw_head *head = rtnl_dereference(tp->root);
	u32 mask;
	int err;

	err = tcf_exts_validate(net, tp, tb, tca[TCA_RATE], &f->exts, 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)
			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 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);
		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);
	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
763dbf63	152	static void fw_destroy(struct tcf_proto *tp)
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
8113c095	175	static int fw_delete(struct tcf_proto tp, void arg, bool *last)
1da177e4	176	{
e35a8ee5	177	struct fw_head *head = rtnl_dereference(tp->root);
8113c095	178	struct fw_filter *f = arg;
e35a8ee5 JF	179	struct fw_filter __rcu **fp;
e35a8ee5 JF	180	struct fw_filter *pfp;
763dbf63 WC	181	int ret = -EINVAL;
763dbf63 WC	182	int h;
1da177e4 LT	183
	184	if (head == NULL \|\| f == NULL)
	185	goto out;
	186
e35a8ee5 JF	187	fp = &head->ht[fw_hash(f->id)];
	188
	189	for (pfp = rtnl_dereference(*fp); pfp;
	190	fp = &pfp->next, pfp = rtnl_dereference(*fp)) {
	191	if (pfp == f) {
	192	RCU_INIT_POINTER(*fp, rtnl_dereference(f->next));
18cdb37e	193	tcf_unbind_filter(tp, &f->res);
d5f984f5	194	tcf_exts_get_net(&f->exts);
e35a8ee5	195	call_rcu(&f->rcu, fw_delete_filter);
763dbf63 WC	196	ret = 0;
763dbf63 WC	197	break;
1da177e4 LT	198	}
1da177e4 LT	199	}
763dbf63 WC	200
	201	*last = true;
	202	for (h = 0; h < HTSIZE; h++) {
	203	if (rcu_access_pointer(head->ht[h])) {
	204	*last = false;
	205	break;
	206	}
	207	}
	208
1da177e4	209	out:
763dbf63	210	return ret;
1da177e4 LT	211	}
1da177e4 LT	212
6fa8c014 PM	213	static const struct nla_policy fw_policy[TCA_FW_MAX + 1] = {
	214	[TCA_FW_CLASSID] = { .type = NLA_U32 },
	215	[TCA_FW_INDEV] = { .type = NLA_STRING, .len = IFNAMSIZ },
	216	[TCA_FW_MASK] = { .type = NLA_U32 },
	217	};
	218
1e5003af JP	219	static int fw_set_parms(struct net net, struct tcf_proto tp,
	220	struct fw_filter f, struct nlattr *tb,
	221	struct nlattr **tca, unsigned long base, bool ovr)
1da177e4	222	{
e35a8ee5	223	struct fw_head *head = rtnl_dereference(tp->root);
b4e9b520	224	u32 mask;
1da177e4 LT	225	int err;
1da177e4 LT	226
94611bff	227	err = tcf_exts_validate(net, tp, tb, tca[TCA_RATE], &f->exts, ovr);
1da177e4 LT	228	if (err < 0)
	229	return err;
	230
add93b61	231	if (tb[TCA_FW_CLASSID]) {
1587bac4	232	f->res.classid = nla_get_u32(tb[TCA_FW_CLASSID]);
1da177e4 LT	233	tcf_bind_filter(tp, &f->res, base);
	234	}
	235
	236	#ifdef CONFIG_NET_CLS_IND
add93b61	237	if (tb[TCA_FW_INDEV]) {
2519a602 WC	238	int ret;
2519a602 WC	239	ret = tcf_change_indev(net, tb[TCA_FW_INDEV]);
94611bff JP	240	if (ret < 0)
94611bff JP	241	return ret;
2519a602	242	f->ifindex = ret;
1da177e4 LT	243	}
	244	#endif /* CONFIG_NET_CLS_IND */
	245
cb95ec62	246	err = -EINVAL;
add93b61	247	if (tb[TCA_FW_MASK]) {
1587bac4	248	mask = nla_get_u32(tb[TCA_FW_MASK]);
b4e9b520	249	if (mask != head->mask)
94611bff	250	return err;
b4e9b520	251	} else if (head->mask != 0xFFFFFFFF)
94611bff	252	return err;
1da177e4 LT	253
1da177e4 LT	254	return 0;
1da177e4 LT	255	}
1da177e4 LT	256
c1b52739	257	static int fw_change(struct net net, struct sk_buff in_skb,
af4c6641	258	struct tcf_proto *tp, unsigned long base,
8113c095	259	u32 handle, struct nlattr tca, void arg,
5a7a5555	260	bool ovr)
1da177e4	261	{
e35a8ee5	262	struct fw_head *head = rtnl_dereference(tp->root);
8113c095	263	struct fw_filter f = arg;
add93b61 PM	264	struct nlattr *opt = tca[TCA_OPTIONS];
add93b61 PM	265	struct nlattr *tb[TCA_FW_MAX + 1];
1da177e4 LT	266	int err;
	267
	268	if (!opt)
d8aecb10	269	return handle ? -EINVAL : 0; /* Succeed if it is old method. */
1da177e4	270
fceb6435	271	err = nla_parse_nested(tb, TCA_FW_MAX, opt, fw_policy, NULL);
cee63723 PM	272	if (err < 0)
cee63723 PM	273	return err;
1da177e4	274
e35a8ee5 JF	275	if (f) {
	276	struct fw_filter pfp, fnew;
	277	struct fw_filter __rcu **fp;
	278
1da177e4 LT	279	if (f->id != handle && handle)
1da177e4 LT	280	return -EINVAL;
e35a8ee5 JF	281
	282	fnew = kzalloc(sizeof(struct fw_filter), GFP_KERNEL);
	283	if (!fnew)
	284	return -ENOBUFS;
	285
	286	fnew->id = f->id;
	287	fnew->res = f->res;
	288	#ifdef CONFIG_NET_CLS_IND
	289	fnew->ifindex = f->ifindex;
	290	#endif /* CONFIG_NET_CLS_IND */
	291	fnew->tp = f->tp;
	292
b9a24bb7 WC	293	err = tcf_exts_init(&fnew->exts, TCA_FW_ACT, TCA_FW_POLICE);
	294	if (err < 0) {
	295	kfree(fnew);
	296	return err;
	297	}
e1f93eb0	298
1e5003af	299	err = fw_set_parms(net, tp, fnew, tb, tca, base, ovr);
e35a8ee5	300	if (err < 0) {
b9a24bb7	301	tcf_exts_destroy(&fnew->exts);
e35a8ee5 JF	302	kfree(fnew);
	303	return err;
	304	}
	305
	306	fp = &head->ht[fw_hash(fnew->id)];
	307	for (pfp = rtnl_dereference(*fp); pfp;
	308	fp = &pfp->next, pfp = rtnl_dereference(*fp))
	309	if (pfp == f)
	310	break;
	311
	312	RCU_INIT_POINTER(fnew->next, rtnl_dereference(pfp->next));
	313	rcu_assign_pointer(*fp, fnew);
18cdb37e	314	tcf_unbind_filter(tp, &f->res);
d5f984f5	315	tcf_exts_get_net(&f->exts);
e35a8ee5 JF	316	call_rcu(&f->rcu, fw_delete_filter);
e35a8ee5 JF	317
8113c095	318	*arg = fnew;
e35a8ee5	319	return err;
1da177e4 LT	320	}
	321
	322	if (!handle)
	323	return -EINVAL;
	324
d8aecb10 WC	325	if (!head) {
d8aecb10 WC	326	u32 mask = 0xFFFFFFFF;
6fa8c014	327	if (tb[TCA_FW_MASK])
d8aecb10 WC	328	mask = nla_get_u32(tb[TCA_FW_MASK]);
	329
	330	head = kzalloc(sizeof(*head), GFP_KERNEL);
	331	if (!head)
	332	return -ENOBUFS;
	333	head->mask = mask;
	334
	335	rcu_assign_pointer(tp->root, head);
1da177e4 LT	336	}
1da177e4 LT	337
0da974f4	338	f = kzalloc(sizeof(struct fw_filter), GFP_KERNEL);
1da177e4 LT	339	if (f == NULL)
1da177e4 LT	340	return -ENOBUFS;
1da177e4	341
b9a24bb7 WC	342	err = tcf_exts_init(&f->exts, TCA_FW_ACT, TCA_FW_POLICE);
	343	if (err < 0)
	344	goto errout;
1da177e4	345	f->id = handle;
e35a8ee5	346	f->tp = tp;
1da177e4	347
1e5003af	348	err = fw_set_parms(net, tp, f, tb, tca, base, ovr);
1da177e4 LT	349	if (err < 0)
	350	goto errout;
	351
e35a8ee5 JF	352	RCU_INIT_POINTER(f->next, head->ht[fw_hash(handle)]);
e35a8ee5 JF	353	rcu_assign_pointer(head->ht[fw_hash(handle)], f);
1da177e4	354
8113c095	355	*arg = f;
1da177e4 LT	356	return 0;
	357
	358	errout:
b9a24bb7	359	tcf_exts_destroy(&f->exts);
a51482bd	360	kfree(f);
1da177e4 LT	361	return err;
	362	}
	363
	364	static void fw_walk(struct tcf_proto tp, struct tcf_walker arg)
	365	{
e35a8ee5	366	struct fw_head *head = rtnl_dereference(tp->root);
1da177e4 LT	367	int h;
	368
	369	if (head == NULL)
	370	arg->stop = 1;
	371
	372	if (arg->stop)
	373	return;
	374
c5c13faf	375	for (h = 0; h < HTSIZE; h++) {
1da177e4 LT	376	struct fw_filter *f;
1da177e4 LT	377
e35a8ee5 JF	378	for (f = rtnl_dereference(head->ht[h]); f;
e35a8ee5 JF	379	f = rtnl_dereference(f->next)) {
1da177e4 LT	380	if (arg->count < arg->skip) {
	381	arg->count++;
	382	continue;
	383	}
8113c095	384	if (arg->fn(tp, f, arg) < 0) {
1da177e4 LT	385	arg->stop = 1;
	386	return;
	387	}
	388	arg->count++;
	389	}
	390	}
	391	}
	392
8113c095	393	static int fw_dump(struct net net, struct tcf_proto tp, void *fh,
1da177e4 LT	394	struct sk_buff skb, struct tcmsg t)
1da177e4 LT	395	{
e35a8ee5	396	struct fw_head *head = rtnl_dereference(tp->root);
8113c095	397	struct fw_filter *f = fh;
4b3550ef	398	struct nlattr *nest;
1da177e4 LT	399
	400	if (f == NULL)
	401	return skb->len;
	402
	403	t->tcm_handle = f->id;
	404
6fc6d06e	405	if (!f->res.classid && !tcf_exts_has_actions(&f->exts))
1da177e4 LT	406	return skb->len;
1da177e4 LT	407
4b3550ef PM	408	nest = nla_nest_start(skb, TCA_OPTIONS);
	409	if (nest == NULL)
	410	goto nla_put_failure;
1da177e4	411
1b34ec43 DM	412	if (f->res.classid &&
	413	nla_put_u32(skb, TCA_FW_CLASSID, f->res.classid))
	414	goto nla_put_failure;
1da177e4	415	#ifdef CONFIG_NET_CLS_IND
2519a602 WC	416	if (f->ifindex) {
	417	struct net_device *dev;
	418	dev = __dev_get_by_index(net, f->ifindex);
	419	if (dev && nla_put_string(skb, TCA_FW_INDEV, dev->name))
	420	goto nla_put_failure;
	421	}
1da177e4	422	#endif /* CONFIG_NET_CLS_IND */
1b34ec43 DM	423	if (head->mask != 0xFFFFFFFF &&
	424	nla_put_u32(skb, TCA_FW_MASK, head->mask))
	425	goto nla_put_failure;
1da177e4	426
5da57f42	427	if (tcf_exts_dump(skb, &f->exts) < 0)
add93b61	428	goto nla_put_failure;
1da177e4	429
4b3550ef	430	nla_nest_end(skb, nest);
1da177e4	431
5da57f42	432	if (tcf_exts_dump_stats(skb, &f->exts) < 0)
add93b61	433	goto nla_put_failure;
1da177e4 LT	434
	435	return skb->len;
	436
add93b61	437	nla_put_failure:
6ea3b446	438	nla_nest_cancel(skb, nest);
1da177e4 LT	439	return -1;
	440	}
	441
07d79fc7 CW	442	static void fw_bind_class(void *fh, u32 classid, unsigned long cl)
	443	{
	444	struct fw_filter *f = fh;
	445
	446	if (f && f->res.classid == classid)
	447	f->res.class = cl;
	448	}
	449
2eb9d75c	450	static struct tcf_proto_ops cls_fw_ops __read_mostly = {
1da177e4 LT	451	.kind = "fw",
	452	.classify = fw_classify,
	453	.init = fw_init,
	454	.destroy = fw_destroy,
	455	.get = fw_get,
1da177e4 LT	456	.change = fw_change,
	457	.delete = fw_delete,
	458	.walk = fw_walk,
	459	.dump = fw_dump,
07d79fc7	460	.bind_class = fw_bind_class,
1da177e4 LT	461	.owner = THIS_MODULE,
	462	};
	463
	464	static int __init init_fw(void)
	465	{
	466	return register_tcf_proto_ops(&cls_fw_ops);
	467	}
	468
10297b99	469	static void __exit exit_fw(void)
1da177e4 LT	470	{
	471	unregister_tcf_proto_ops(&cls_fw_ops);
	472	}
	473
	474	module_init(init_fw)
	475	module_exit(exit_fw)
	476	MODULE_LICENSE("GPL");