[linux-2.6-block.git] / net / sched / cls_fw.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * net/sched/cls_fw.c	Classifier mapping ipchains' fwmark to traffic class.
 *
 * 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
 */

#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>
#include <net/tc_wrapper.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;
	int			ifindex;
	struct tcf_exts		exts;
	struct tcf_proto	*tp;
	struct rcu_work		rwork;
};

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

TC_INDIRECT_SCOPE 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;
				if (!tcf_match_indev(skb, f->ifindex))
					continue;
				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(to_rcu_work(work),
					   struct fw_filter,
					   rwork);
	rtnl_lock();
	__fw_delete_filter(f);
	rtnl_unlock();
}

static void fw_destroy(struct tcf_proto *tp, bool rtnl_held,
		       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))
				tcf_queue_work(&f->rwork, fw_delete_filter_work);
			else
				__fw_delete_filter(f);
		}
	}
	kfree_rcu(head, rcu);
}

static int fw_delete(struct tcf_proto *tp, void *arg, bool *last,
		     bool rtnl_held, 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);
			tcf_queue_work(&f->rwork, fw_delete_filter_work);
			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, u32 flags,
			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, flags,
				extack);
	if (err < 0)
		return err;

	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;
	}

	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;

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

	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,
		     u32 flags, 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_deprecated(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->ifindex = f->ifindex;
		fnew->tp = f->tp;

		err = tcf_exts_init(&fnew->exts, net, TCA_FW_ACT,
				    TCA_FW_POLICE);
		if (err < 0) {
			kfree(fnew);
			return err;
		}

		err = fw_set_parms(net, tp, fnew, tb, tca, base, flags, 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);
		tcf_queue_work(&f->rwork, fw_delete_filter_work);

		*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, net, 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, flags, 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,
		    bool rtnl_held)
{
	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 (!tc_cls_stats_dump(tp, arg, f))
				return;
		}
	}
}

static int fw_dump(struct net *net, struct tcf_proto *tp, void *fh,
		   struct sk_buff *skb, struct tcmsg *t, bool rtnl_held)
{
	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_noflag(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;
	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;
	}
	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, void *q,
			  unsigned long base)
{
	struct fw_filter *f = fh;

	tc_cls_bind_class(classid, cl, q, &f->res, base);
}

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_DESCRIPTION("SKB mark based TC classifier");
MODULE_LICENSE("GPL");
Commit	Line	Data
2874c5fd	1	// SPDX-License-Identifier: GPL-2.0-or-later
1da177e4 LT	2	/*
	3	* net/sched/cls_fw.c Classifier mapping ipchains' fwmark to traffic class.
	4	*
1da177e4 LT	5	* Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
	6	*
	7	* Changes:
	8	* Karlis Peisenieks <karlis@mt.lv> : 990415 : fw_walk off by one
	9	* Karlis Peisenieks <karlis@mt.lv> : 990415 : fw_delete killed all the filter (and kernel).
	10	* Alex <alex@pilotsoft.com> : 2004xxyy: Added Action extension
1da177e4 LT	11	*/
1da177e4 LT	12
1da177e4	13	#include <linux/module.h>
5a0e3ad6	14	#include <linux/slab.h>
1da177e4 LT	15	#include <linux/types.h>
1da177e4 LT	16	#include <linux/kernel.h>
1da177e4	17	#include <linux/string.h>
1da177e4	18	#include <linux/errno.h>
1da177e4	19	#include <linux/skbuff.h>
0ba48053	20	#include <net/netlink.h>
1da177e4 LT	21	#include <net/act_api.h>
1da177e4 LT	22	#include <net/pkt_cls.h>
1abf2720	23	#include <net/sch_generic.h>
9f3101dc	24	#include <net/tc_wrapper.h>
1da177e4	25
d37d8ac1	26	#define HTSIZE 256
c5c13faf	27
cc7ec456	28	struct fw_head {
d37d8ac1	29	u32 mask;
e35a8ee5 JF	30	struct fw_filter __rcu *ht[HTSIZE];
e35a8ee5 JF	31	struct rcu_head rcu;
1da177e4 LT	32	};
1da177e4 LT	33
cc7ec456	34	struct fw_filter {
e35a8ee5	35	struct fw_filter __rcu *next;
1da177e4 LT	36	u32 id;
1da177e4 LT	37	struct tcf_result res;
2519a602	38	int ifindex;
1da177e4	39	struct tcf_exts exts;
e35a8ee5	40	struct tcf_proto *tp;
aaa908ff	41	struct rcu_work rwork;
1da177e4 LT	42	};
1da177e4 LT	43
d37d8ac1	44	static u32 fw_hash(u32 handle)
1da177e4	45	{
d37d8ac1 ED	46	handle ^= (handle >> 16);
	47	handle ^= (handle >> 8);
	48	return handle % HTSIZE;
1da177e4 LT	49	}
1da177e4 LT	50
9f3101dc PT	51	TC_INDIRECT_SCOPE int fw_classify(struct sk_buff *skb,
	52	const struct tcf_proto *tp,
	53	struct tcf_result *res)
1da177e4	54	{
e35a8ee5	55	struct fw_head *head = rcu_dereference_bh(tp->root);
1da177e4 LT	56	struct fw_filter *f;
1da177e4 LT	57	int r;
5c804bfd	58	u32 id = skb->mark;
1da177e4 LT	59
1da177e4 LT	60	if (head != NULL) {
5c804bfd	61	id &= head->mask;
e35a8ee5 JF	62
	63	for (f = rcu_dereference_bh(head->ht[fw_hash(id)]); f;
	64	f = rcu_dereference_bh(f->next)) {
1da177e4 LT	65	if (f->id == id) {
1da177e4 LT	66	*res = f->res;
2519a602	67	if (!tcf_match_indev(skb, f->ifindex))
1da177e4	68	continue;
1da177e4 LT	69	r = tcf_exts_exec(skb, &f->exts, res);
	70	if (r < 0)
	71	continue;
	72
	73	return r;
	74	}
	75	}
	76	} else {
1abf2720 JP	77	struct Qdisc *q = tcf_block_q(tp->chain->block);
1abf2720 JP	78
d8aecb10	79	/* Old method: classify the packet using its skb mark. */
cc7ec456	80	if (id && (TC_H_MAJ(id) == 0 \|\|
1abf2720	81	!(TC_H_MAJ(id ^ q->handle)))) {
1da177e4 LT	82	res->classid = id;
	83	res->class = 0;
	84	return 0;
	85	}
	86	}
	87
	88	return -1;
	89	}
	90
8113c095	91	static void fw_get(struct tcf_proto tp, u32 handle)
1da177e4	92	{
e35a8ee5	93	struct fw_head *head = rtnl_dereference(tp->root);
1da177e4 LT	94	struct fw_filter *f;
	95
	96	if (head == NULL)
8113c095	97	return NULL;
1da177e4	98
e35a8ee5 JF	99	f = rtnl_dereference(head->ht[fw_hash(handle)]);
e35a8ee5 JF	100	for (; f; f = rtnl_dereference(f->next)) {
1da177e4	101	if (f->id == handle)
8113c095	102	return f;
1da177e4	103	}
8113c095	104	return NULL;
1da177e4 LT	105	}
1da177e4 LT	106
1da177e4 LT	107	static int fw_init(struct tcf_proto *tp)
1da177e4 LT	108	{
d8aecb10 WC	109	/* We don't allocate fw_head here, because in the old method
	110	* we don't need it at all.
	111	*/
1da177e4 LT	112	return 0;
	113	}
	114
d5f984f5 CW	115	static void __fw_delete_filter(struct fw_filter *f)
	116	{
	117	tcf_exts_destroy(&f->exts);
	118	tcf_exts_put_net(&f->exts);
	119	kfree(f);
	120	}
	121
e071dff2	122	static void fw_delete_filter_work(struct work_struct *work)
1da177e4	123	{
aaa908ff CW	124	struct fw_filter *f = container_of(to_rcu_work(work),
	125	struct fw_filter,
	126	rwork);
e071dff2	127	rtnl_lock();
d5f984f5	128	__fw_delete_filter(f);
e071dff2 CW	129	rtnl_unlock();
	130	}
	131
12db03b6 VB	132	static void fw_destroy(struct tcf_proto *tp, bool rtnl_held,
12db03b6 VB	133	struct netlink_ext_ack *extack)
1da177e4	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)
763dbf63	140	return;
1da177e4	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));
18cdb37e	146	tcf_unbind_filter(tp, &f->res);
d5f984f5	147	if (tcf_exts_get_net(&f->exts))
aaa908ff	148	tcf_queue_work(&f->rwork, fw_delete_filter_work);
d5f984f5 CW	149	else
d5f984f5 CW	150	__fw_delete_filter(f);
1da177e4 LT	151	}
1da177e4 LT	152	}
e35a8ee5	153	kfree_rcu(head, rcu);
1da177e4 LT	154	}
1da177e4 LT	155
571acf21	156	static int fw_delete(struct tcf_proto tp, void arg, bool *last,
12db03b6	157	bool rtnl_held, struct netlink_ext_ack *extack)
1da177e4	158	{
e35a8ee5	159	struct fw_head *head = rtnl_dereference(tp->root);
8113c095	160	struct fw_filter *f = arg;
e35a8ee5 JF	161	struct fw_filter __rcu **fp;
e35a8ee5 JF	162	struct fw_filter *pfp;
763dbf63 WC	163	int ret = -EINVAL;
763dbf63 WC	164	int h;
1da177e4 LT	165
	166	if (head == NULL \|\| f == NULL)
	167	goto out;
	168
e35a8ee5 JF	169	fp = &head->ht[fw_hash(f->id)];
	170
	171	for (pfp = rtnl_dereference(*fp); pfp;
	172	fp = &pfp->next, pfp = rtnl_dereference(*fp)) {
	173	if (pfp == f) {
	174	RCU_INIT_POINTER(*fp, rtnl_dereference(f->next));
18cdb37e	175	tcf_unbind_filter(tp, &f->res);
d5f984f5	176	tcf_exts_get_net(&f->exts);
aaa908ff	177	tcf_queue_work(&f->rwork, fw_delete_filter_work);
763dbf63 WC	178	ret = 0;
763dbf63 WC	179	break;
1da177e4 LT	180	}
1da177e4 LT	181	}
763dbf63 WC	182
	183	*last = true;
	184	for (h = 0; h < HTSIZE; h++) {
	185	if (rcu_access_pointer(head->ht[h])) {
	186	*last = false;
	187	break;
	188	}
	189	}
	190
1da177e4	191	out:
763dbf63	192	return ret;
1da177e4 LT	193	}
1da177e4 LT	194
6fa8c014 PM	195	static const struct nla_policy fw_policy[TCA_FW_MAX + 1] = {
	196	[TCA_FW_CLASSID] = { .type = NLA_U32 },
	197	[TCA_FW_INDEV] = { .type = NLA_STRING, .len = IFNAMSIZ },
	198	[TCA_FW_MASK] = { .type = NLA_U32 },
	199	};
	200
1e5003af JP	201	static int fw_set_parms(struct net net, struct tcf_proto tp,
1e5003af JP	202	struct fw_filter f, struct nlattr *tb,
695176bf	203	struct nlattr **tca, unsigned long base, u32 flags,
50a56190	204	struct netlink_ext_ack *extack)
1da177e4	205	{
e35a8ee5	206	struct fw_head *head = rtnl_dereference(tp->root);
b4e9b520	207	u32 mask;
1da177e4 LT	208	int err;
1da177e4 LT	209
695176bf CW	210	err = tcf_exts_validate(net, tp, tb, tca[TCA_RATE], &f->exts, flags,
695176bf CW	211	extack);
1da177e4 LT	212	if (err < 0)
	213	return err;
	214
add93b61	215	if (tb[TCA_FW_INDEV]) {
2519a602	216	int ret;
1057c55f	217	ret = tcf_change_indev(net, tb[TCA_FW_INDEV], extack);
94611bff JP	218	if (ret < 0)
94611bff JP	219	return ret;
2519a602	220	f->ifindex = ret;
1da177e4	221	}
1da177e4	222
cb95ec62	223	err = -EINVAL;
add93b61	224	if (tb[TCA_FW_MASK]) {
1587bac4	225	mask = nla_get_u32(tb[TCA_FW_MASK]);
b4e9b520	226	if (mask != head->mask)
94611bff	227	return err;
b4e9b520	228	} else if (head->mask != 0xFFFFFFFF)
94611bff	229	return err;
1da177e4	230
0323bce5 R	231	if (tb[TCA_FW_CLASSID]) {
	232	f->res.classid = nla_get_u32(tb[TCA_FW_CLASSID]);
	233	tcf_bind_filter(tp, &f->res, base);
	234	}
	235
1da177e4	236	return 0;
1da177e4 LT	237	}
1da177e4 LT	238
c1b52739	239	static int fw_change(struct net net, struct sk_buff in_skb,
af4c6641	240	struct tcf_proto *tp, unsigned long base,
8113c095	241	u32 handle, struct nlattr tca, void arg,
695176bf	242	u32 flags, struct netlink_ext_ack *extack)
1da177e4	243	{
e35a8ee5	244	struct fw_head *head = rtnl_dereference(tp->root);
8113c095	245	struct fw_filter f = arg;
add93b61 PM	246	struct nlattr *opt = tca[TCA_OPTIONS];
add93b61 PM	247	struct nlattr *tb[TCA_FW_MAX + 1];
1da177e4 LT	248	int err;
	249
	250	if (!opt)
d8aecb10	251	return handle ? -EINVAL : 0; /* Succeed if it is old method. */
1da177e4	252
8cb08174 JB	253	err = nla_parse_nested_deprecated(tb, TCA_FW_MAX, opt, fw_policy,
8cb08174 JB	254	NULL);
cee63723 PM	255	if (err < 0)
cee63723 PM	256	return err;
1da177e4	257
e35a8ee5 JF	258	if (f) {
	259	struct fw_filter pfp, fnew;
	260	struct fw_filter __rcu **fp;
	261
1da177e4 LT	262	if (f->id != handle && handle)
1da177e4 LT	263	return -EINVAL;
e35a8ee5 JF	264
	265	fnew = kzalloc(sizeof(struct fw_filter), GFP_KERNEL);
	266	if (!fnew)
	267	return -ENOBUFS;
	268
	269	fnew->id = f->id;
e35a8ee5	270	fnew->ifindex = f->ifindex;
e35a8ee5 JF	271	fnew->tp = f->tp;
e35a8ee5 JF	272
14215108 CW	273	err = tcf_exts_init(&fnew->exts, net, TCA_FW_ACT,
14215108 CW	274	TCA_FW_POLICE);
b9a24bb7 WC	275	if (err < 0) {
	276	kfree(fnew);
	277	return err;
	278	}
e1f93eb0	279
695176bf	280	err = fw_set_parms(net, tp, fnew, tb, tca, base, flags, extack);
e35a8ee5	281	if (err < 0) {
b9a24bb7	282	tcf_exts_destroy(&fnew->exts);
e35a8ee5 JF	283	kfree(fnew);
	284	return err;
	285	}
	286
	287	fp = &head->ht[fw_hash(fnew->id)];
	288	for (pfp = rtnl_dereference(*fp); pfp;
	289	fp = &pfp->next, pfp = rtnl_dereference(*fp))
	290	if (pfp == f)
	291	break;
	292
	293	RCU_INIT_POINTER(fnew->next, rtnl_dereference(pfp->next));
	294	rcu_assign_pointer(*fp, fnew);
18cdb37e	295	tcf_unbind_filter(tp, &f->res);
d5f984f5	296	tcf_exts_get_net(&f->exts);
aaa908ff	297	tcf_queue_work(&f->rwork, fw_delete_filter_work);
e35a8ee5	298
8113c095	299	*arg = fnew;
e35a8ee5	300	return err;
1da177e4 LT	301	}
	302
	303	if (!handle)
	304	return -EINVAL;
	305
d8aecb10 WC	306	if (!head) {
d8aecb10 WC	307	u32 mask = 0xFFFFFFFF;
6fa8c014	308	if (tb[TCA_FW_MASK])
d8aecb10 WC	309	mask = nla_get_u32(tb[TCA_FW_MASK]);
	310
	311	head = kzalloc(sizeof(*head), GFP_KERNEL);
	312	if (!head)
	313	return -ENOBUFS;
	314	head->mask = mask;
	315
	316	rcu_assign_pointer(tp->root, head);
1da177e4 LT	317	}
1da177e4 LT	318
0da974f4	319	f = kzalloc(sizeof(struct fw_filter), GFP_KERNEL);
1da177e4 LT	320	if (f == NULL)
1da177e4 LT	321	return -ENOBUFS;
1da177e4	322
14215108	323	err = tcf_exts_init(&f->exts, net, TCA_FW_ACT, TCA_FW_POLICE);
b9a24bb7 WC	324	if (err < 0)
b9a24bb7 WC	325	goto errout;
1da177e4	326	f->id = handle;
e35a8ee5	327	f->tp = tp;
1da177e4	328
695176bf	329	err = fw_set_parms(net, tp, f, tb, tca, base, flags, extack);
1da177e4 LT	330	if (err < 0)
	331	goto errout;
	332
e35a8ee5 JF	333	RCU_INIT_POINTER(f->next, head->ht[fw_hash(handle)]);
e35a8ee5 JF	334	rcu_assign_pointer(head->ht[fw_hash(handle)], f);
1da177e4	335
8113c095	336	*arg = f;
1da177e4 LT	337	return 0;
	338
	339	errout:
b9a24bb7	340	tcf_exts_destroy(&f->exts);
a51482bd	341	kfree(f);
1da177e4 LT	342	return err;
	343	}
	344
12db03b6 VB	345	static void fw_walk(struct tcf_proto tp, struct tcf_walker arg,
12db03b6 VB	346	bool rtnl_held)
1da177e4	347	{
e35a8ee5	348	struct fw_head *head = rtnl_dereference(tp->root);
1da177e4 LT	349	int h;
1da177e4 LT	350
1d997875 VB	351	if (head == NULL)
	352	arg->stop = 1;
	353
	354	if (arg->stop)
1da177e4 LT	355	return;
1da177e4 LT	356
c5c13faf	357	for (h = 0; h < HTSIZE; h++) {
1da177e4 LT	358	struct fw_filter *f;
1da177e4 LT	359
e35a8ee5 JF	360	for (f = rtnl_dereference(head->ht[h]); f;
e35a8ee5 JF	361	f = rtnl_dereference(f->next)) {
5508ff7c	362	if (!tc_cls_stats_dump(tp, arg, f))
1da177e4	363	return;
1da177e4 LT	364	}
	365	}
	366	}
	367
8113c095	368	static int fw_dump(struct net net, struct tcf_proto tp, void *fh,
12db03b6	369	struct sk_buff skb, struct tcmsg t, bool rtnl_held)
1da177e4	370	{
e35a8ee5	371	struct fw_head *head = rtnl_dereference(tp->root);
8113c095	372	struct fw_filter *f = fh;
4b3550ef	373	struct nlattr *nest;
1da177e4 LT	374
	375	if (f == NULL)
	376	return skb->len;
	377
	378	t->tcm_handle = f->id;
	379
6fc6d06e	380	if (!f->res.classid && !tcf_exts_has_actions(&f->exts))
1da177e4 LT	381	return skb->len;
1da177e4 LT	382
ae0be8de	383	nest = nla_nest_start_noflag(skb, TCA_OPTIONS);
4b3550ef PM	384	if (nest == NULL)
4b3550ef PM	385	goto nla_put_failure;
1da177e4	386
1b34ec43 DM	387	if (f->res.classid &&
	388	nla_put_u32(skb, TCA_FW_CLASSID, f->res.classid))
	389	goto nla_put_failure;
2519a602 WC	390	if (f->ifindex) {
	391	struct net_device *dev;
	392	dev = __dev_get_by_index(net, f->ifindex);
	393	if (dev && nla_put_string(skb, TCA_FW_INDEV, dev->name))
	394	goto nla_put_failure;
	395	}
1b34ec43 DM	396	if (head->mask != 0xFFFFFFFF &&
	397	nla_put_u32(skb, TCA_FW_MASK, head->mask))
	398	goto nla_put_failure;
1da177e4	399
5da57f42	400	if (tcf_exts_dump(skb, &f->exts) < 0)
add93b61	401	goto nla_put_failure;
1da177e4	402
4b3550ef	403	nla_nest_end(skb, nest);
1da177e4	404
5da57f42	405	if (tcf_exts_dump_stats(skb, &f->exts) < 0)
add93b61	406	goto nla_put_failure;
1da177e4 LT	407
	408	return skb->len;
	409
add93b61	410	nla_put_failure:
6ea3b446	411	nla_nest_cancel(skb, nest);
1da177e4 LT	412	return -1;
	413	}
	414
2e24cd75 CW	415	static void fw_bind_class(void fh, u32 classid, unsigned long cl, void q,
2e24cd75 CW	416	unsigned long base)
07d79fc7 CW	417	{
	418	struct fw_filter *f = fh;
	419
cc9039a1	420	tc_cls_bind_class(classid, cl, q, &f->res, base);
07d79fc7 CW	421	}
07d79fc7 CW	422
2eb9d75c	423	static struct tcf_proto_ops cls_fw_ops __read_mostly = {
1da177e4 LT	424	.kind = "fw",
	425	.classify = fw_classify,
	426	.init = fw_init,
	427	.destroy = fw_destroy,
	428	.get = fw_get,
1da177e4 LT	429	.change = fw_change,
	430	.delete = fw_delete,
	431	.walk = fw_walk,
	432	.dump = fw_dump,
07d79fc7	433	.bind_class = fw_bind_class,
1da177e4 LT	434	.owner = THIS_MODULE,
	435	};
	436
	437	static int __init init_fw(void)
	438	{
	439	return register_tcf_proto_ops(&cls_fw_ops);
	440	}
	441
10297b99	442	static void __exit exit_fw(void)
1da177e4 LT	443	{
	444	unregister_tcf_proto_ops(&cls_fw_ops);
	445	}
	446
	447	module_init(init_fw)
	448	module_exit(exit_fw)
a9c92771	449	MODULE_DESCRIPTION("SKB mark based TC classifier");
1da177e4	450	MODULE_LICENSE("GPL");