[linux-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>

#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;
}

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

	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;

	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->res = f->res;
		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 (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, 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;

	if (f && f->res.classid == classid) {
		if (cl)
			__tcf_bind_filter(q, &f->res, base);
		else
			__tcf_unbind_filter(q, &f->res);
	}
}

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
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>
1da177e4	24
d37d8ac1	25	#define HTSIZE 256
c5c13faf	26
cc7ec456	27	struct fw_head {
d37d8ac1	28	u32 mask;
e35a8ee5 JF	29	struct fw_filter __rcu *ht[HTSIZE];
e35a8ee5 JF	30	struct rcu_head rcu;
1da177e4 LT	31	};
1da177e4 LT	32
cc7ec456	33	struct fw_filter {
e35a8ee5	34	struct fw_filter __rcu *next;
1da177e4 LT	35	u32 id;
1da177e4 LT	36	struct tcf_result res;
2519a602	37	int ifindex;
1da177e4	38	struct tcf_exts exts;
e35a8ee5	39	struct tcf_proto *tp;
aaa908ff	40	struct rcu_work rwork;
1da177e4 LT	41	};
1da177e4 LT	42
d37d8ac1	43	static u32 fw_hash(u32 handle)
1da177e4	44	{
d37d8ac1 ED	45	handle ^= (handle >> 16);
	46	handle ^= (handle >> 8);
	47	return handle % HTSIZE;
1da177e4 LT	48	}
1da177e4 LT	49
dc7f9f6e	50	static int fw_classify(struct sk_buff skb, const struct tcf_proto tp,
5a7a5555	51	struct tcf_result *res)
1da177e4	52	{
e35a8ee5	53	struct fw_head *head = rcu_dereference_bh(tp->root);
1da177e4 LT	54	struct fw_filter *f;
1da177e4 LT	55	int r;
5c804bfd	56	u32 id = skb->mark;
1da177e4 LT	57
1da177e4 LT	58	if (head != NULL) {
5c804bfd	59	id &= head->mask;
e35a8ee5 JF	60
	61	for (f = rcu_dereference_bh(head->ht[fw_hash(id)]); f;
	62	f = rcu_dereference_bh(f->next)) {
1da177e4 LT	63	if (f->id == id) {
1da177e4 LT	64	*res = f->res;
2519a602	65	if (!tcf_match_indev(skb, f->ifindex))
1da177e4	66	continue;
1da177e4 LT	67	r = tcf_exts_exec(skb, &f->exts, res);
	68	if (r < 0)
	69	continue;
	70
	71	return r;
	72	}
	73	}
	74	} else {
1abf2720 JP	75	struct Qdisc *q = tcf_block_q(tp->chain->block);
1abf2720 JP	76
d8aecb10	77	/* Old method: classify the packet using its skb mark. */
cc7ec456	78	if (id && (TC_H_MAJ(id) == 0 \|\|
1abf2720	79	!(TC_H_MAJ(id ^ q->handle)))) {
1da177e4 LT	80	res->classid = id;
	81	res->class = 0;
	82	return 0;
	83	}
	84	}
	85
	86	return -1;
	87	}
	88
8113c095	89	static void fw_get(struct tcf_proto tp, u32 handle)
1da177e4	90	{
e35a8ee5	91	struct fw_head *head = rtnl_dereference(tp->root);
1da177e4 LT	92	struct fw_filter *f;
	93
	94	if (head == NULL)
8113c095	95	return NULL;
1da177e4	96
e35a8ee5 JF	97	f = rtnl_dereference(head->ht[fw_hash(handle)]);
e35a8ee5 JF	98	for (; f; f = rtnl_dereference(f->next)) {
1da177e4	99	if (f->id == handle)
8113c095	100	return f;
1da177e4	101	}
8113c095	102	return NULL;
1da177e4 LT	103	}
1da177e4 LT	104
1da177e4 LT	105	static int fw_init(struct tcf_proto *tp)
1da177e4 LT	106	{
d8aecb10 WC	107	/* We don't allocate fw_head here, because in the old method
	108	* we don't need it at all.
	109	*/
1da177e4 LT	110	return 0;
	111	}
	112
d5f984f5 CW	113	static void __fw_delete_filter(struct fw_filter *f)
	114	{
	115	tcf_exts_destroy(&f->exts);
	116	tcf_exts_put_net(&f->exts);
	117	kfree(f);
	118	}
	119
e071dff2	120	static void fw_delete_filter_work(struct work_struct *work)
1da177e4	121	{
aaa908ff CW	122	struct fw_filter *f = container_of(to_rcu_work(work),
	123	struct fw_filter,
	124	rwork);
e071dff2	125	rtnl_lock();
d5f984f5	126	__fw_delete_filter(f);
e071dff2 CW	127	rtnl_unlock();
	128	}
	129
12db03b6 VB	130	static void fw_destroy(struct tcf_proto *tp, bool rtnl_held,
12db03b6 VB	131	struct netlink_ext_ack *extack)
1da177e4	132	{
e35a8ee5	133	struct fw_head *head = rtnl_dereference(tp->root);
1da177e4 LT	134	struct fw_filter *f;
	135	int h;
	136
	137	if (head == NULL)
763dbf63	138	return;
1da177e4	139
cc7ec456	140	for (h = 0; h < HTSIZE; h++) {
e35a8ee5 JF	141	while ((f = rtnl_dereference(head->ht[h])) != NULL) {
	142	RCU_INIT_POINTER(head->ht[h],
	143	rtnl_dereference(f->next));
18cdb37e	144	tcf_unbind_filter(tp, &f->res);
d5f984f5	145	if (tcf_exts_get_net(&f->exts))
aaa908ff	146	tcf_queue_work(&f->rwork, fw_delete_filter_work);
d5f984f5 CW	147	else
d5f984f5 CW	148	__fw_delete_filter(f);
1da177e4 LT	149	}
1da177e4 LT	150	}
e35a8ee5	151	kfree_rcu(head, rcu);
1da177e4 LT	152	}
1da177e4 LT	153
571acf21	154	static int fw_delete(struct tcf_proto tp, void arg, bool *last,
12db03b6	155	bool rtnl_held, struct netlink_ext_ack *extack)
1da177e4	156	{
e35a8ee5	157	struct fw_head *head = rtnl_dereference(tp->root);
8113c095	158	struct fw_filter *f = arg;
e35a8ee5 JF	159	struct fw_filter __rcu **fp;
e35a8ee5 JF	160	struct fw_filter *pfp;
763dbf63 WC	161	int ret = -EINVAL;
763dbf63 WC	162	int h;
1da177e4 LT	163
	164	if (head == NULL \|\| f == NULL)
	165	goto out;
	166
e35a8ee5 JF	167	fp = &head->ht[fw_hash(f->id)];
	168
	169	for (pfp = rtnl_dereference(*fp); pfp;
	170	fp = &pfp->next, pfp = rtnl_dereference(*fp)) {
	171	if (pfp == f) {
	172	RCU_INIT_POINTER(*fp, rtnl_dereference(f->next));
18cdb37e	173	tcf_unbind_filter(tp, &f->res);
d5f984f5	174	tcf_exts_get_net(&f->exts);
aaa908ff	175	tcf_queue_work(&f->rwork, fw_delete_filter_work);
763dbf63 WC	176	ret = 0;
763dbf63 WC	177	break;
1da177e4 LT	178	}
1da177e4 LT	179	}
763dbf63 WC	180
	181	*last = true;
	182	for (h = 0; h < HTSIZE; h++) {
	183	if (rcu_access_pointer(head->ht[h])) {
	184	*last = false;
	185	break;
	186	}
	187	}
	188
1da177e4	189	out:
763dbf63	190	return ret;
1da177e4 LT	191	}
1da177e4 LT	192
6fa8c014 PM	193	static const struct nla_policy fw_policy[TCA_FW_MAX + 1] = {
	194	[TCA_FW_CLASSID] = { .type = NLA_U32 },
	195	[TCA_FW_INDEV] = { .type = NLA_STRING, .len = IFNAMSIZ },
	196	[TCA_FW_MASK] = { .type = NLA_U32 },
	197	};
	198
1e5003af JP	199	static int fw_set_parms(struct net net, struct tcf_proto tp,
1e5003af JP	200	struct fw_filter f, struct nlattr *tb,
695176bf	201	struct nlattr **tca, unsigned long base, u32 flags,
50a56190	202	struct netlink_ext_ack *extack)
1da177e4	203	{
e35a8ee5	204	struct fw_head *head = rtnl_dereference(tp->root);
b4e9b520	205	u32 mask;
1da177e4 LT	206	int err;
1da177e4 LT	207
695176bf CW	208	err = tcf_exts_validate(net, tp, tb, tca[TCA_RATE], &f->exts, flags,
695176bf CW	209	extack);
1da177e4 LT	210	if (err < 0)
	211	return err;
	212
add93b61	213	if (tb[TCA_FW_CLASSID]) {
1587bac4	214	f->res.classid = nla_get_u32(tb[TCA_FW_CLASSID]);
1da177e4 LT	215	tcf_bind_filter(tp, &f->res, base);
	216	}
	217
add93b61	218	if (tb[TCA_FW_INDEV]) {
2519a602	219	int ret;
1057c55f	220	ret = tcf_change_indev(net, tb[TCA_FW_INDEV], extack);
94611bff JP	221	if (ret < 0)
94611bff JP	222	return ret;
2519a602	223	f->ifindex = ret;
1da177e4	224	}
1da177e4	225
cb95ec62	226	err = -EINVAL;
add93b61	227	if (tb[TCA_FW_MASK]) {
1587bac4	228	mask = nla_get_u32(tb[TCA_FW_MASK]);
b4e9b520	229	if (mask != head->mask)
94611bff	230	return err;
b4e9b520	231	} else if (head->mask != 0xFFFFFFFF)
94611bff	232	return err;
1da177e4 LT	233
1da177e4 LT	234	return 0;
1da177e4 LT	235	}
1da177e4 LT	236
c1b52739	237	static int fw_change(struct net net, struct sk_buff in_skb,
af4c6641	238	struct tcf_proto *tp, unsigned long base,
8113c095	239	u32 handle, struct nlattr tca, void arg,
695176bf	240	u32 flags, struct netlink_ext_ack *extack)
1da177e4	241	{
e35a8ee5	242	struct fw_head *head = rtnl_dereference(tp->root);
8113c095	243	struct fw_filter f = arg;
add93b61 PM	244	struct nlattr *opt = tca[TCA_OPTIONS];
add93b61 PM	245	struct nlattr *tb[TCA_FW_MAX + 1];
1da177e4 LT	246	int err;
	247
	248	if (!opt)
d8aecb10	249	return handle ? -EINVAL : 0; /* Succeed if it is old method. */
1da177e4	250
8cb08174 JB	251	err = nla_parse_nested_deprecated(tb, TCA_FW_MAX, opt, fw_policy,
8cb08174 JB	252	NULL);
cee63723 PM	253	if (err < 0)
cee63723 PM	254	return err;
1da177e4	255
e35a8ee5 JF	256	if (f) {
	257	struct fw_filter pfp, fnew;
	258	struct fw_filter __rcu **fp;
	259
1da177e4 LT	260	if (f->id != handle && handle)
1da177e4 LT	261	return -EINVAL;
e35a8ee5 JF	262
	263	fnew = kzalloc(sizeof(struct fw_filter), GFP_KERNEL);
	264	if (!fnew)
	265	return -ENOBUFS;
	266
	267	fnew->id = f->id;
	268	fnew->res = f->res;
e35a8ee5	269	fnew->ifindex = f->ifindex;
e35a8ee5 JF	270	fnew->tp = f->tp;
e35a8ee5 JF	271
14215108 CW	272	err = tcf_exts_init(&fnew->exts, net, TCA_FW_ACT,
14215108 CW	273	TCA_FW_POLICE);
b9a24bb7 WC	274	if (err < 0) {
	275	kfree(fnew);
	276	return err;
	277	}
e1f93eb0	278
695176bf	279	err = fw_set_parms(net, tp, fnew, tb, tca, base, flags, extack);
e35a8ee5	280	if (err < 0) {
b9a24bb7	281	tcf_exts_destroy(&fnew->exts);
e35a8ee5 JF	282	kfree(fnew);
	283	return err;
	284	}
	285
	286	fp = &head->ht[fw_hash(fnew->id)];
	287	for (pfp = rtnl_dereference(*fp); pfp;
	288	fp = &pfp->next, pfp = rtnl_dereference(*fp))
	289	if (pfp == f)
	290	break;
	291
	292	RCU_INIT_POINTER(fnew->next, rtnl_dereference(pfp->next));
	293	rcu_assign_pointer(*fp, fnew);
18cdb37e	294	tcf_unbind_filter(tp, &f->res);
d5f984f5	295	tcf_exts_get_net(&f->exts);
aaa908ff	296	tcf_queue_work(&f->rwork, fw_delete_filter_work);
e35a8ee5	297
8113c095	298	*arg = fnew;
e35a8ee5	299	return err;
1da177e4 LT	300	}
	301
	302	if (!handle)
	303	return -EINVAL;
	304
d8aecb10 WC	305	if (!head) {
d8aecb10 WC	306	u32 mask = 0xFFFFFFFF;
6fa8c014	307	if (tb[TCA_FW_MASK])
d8aecb10 WC	308	mask = nla_get_u32(tb[TCA_FW_MASK]);
	309
	310	head = kzalloc(sizeof(*head), GFP_KERNEL);
	311	if (!head)
	312	return -ENOBUFS;
	313	head->mask = mask;
	314
	315	rcu_assign_pointer(tp->root, head);
1da177e4 LT	316	}
1da177e4 LT	317
0da974f4	318	f = kzalloc(sizeof(struct fw_filter), GFP_KERNEL);
1da177e4 LT	319	if (f == NULL)
1da177e4 LT	320	return -ENOBUFS;
1da177e4	321
14215108	322	err = tcf_exts_init(&f->exts, net, TCA_FW_ACT, TCA_FW_POLICE);
b9a24bb7 WC	323	if (err < 0)
b9a24bb7 WC	324	goto errout;
1da177e4	325	f->id = handle;
e35a8ee5	326	f->tp = tp;
1da177e4	327
695176bf	328	err = fw_set_parms(net, tp, f, tb, tca, base, flags, extack);
1da177e4 LT	329	if (err < 0)
	330	goto errout;
	331
e35a8ee5 JF	332	RCU_INIT_POINTER(f->next, head->ht[fw_hash(handle)]);
e35a8ee5 JF	333	rcu_assign_pointer(head->ht[fw_hash(handle)], f);
1da177e4	334
8113c095	335	*arg = f;
1da177e4 LT	336	return 0;
	337
	338	errout:
b9a24bb7	339	tcf_exts_destroy(&f->exts);
a51482bd	340	kfree(f);
1da177e4 LT	341	return err;
	342	}
	343
12db03b6 VB	344	static void fw_walk(struct tcf_proto tp, struct tcf_walker arg,
12db03b6 VB	345	bool rtnl_held)
1da177e4	346	{
e35a8ee5	347	struct fw_head *head = rtnl_dereference(tp->root);
1da177e4 LT	348	int h;
1da177e4 LT	349
1d997875 VB	350	if (head == NULL)
	351	arg->stop = 1;
	352
	353	if (arg->stop)
1da177e4 LT	354	return;
1da177e4 LT	355
c5c13faf	356	for (h = 0; h < HTSIZE; h++) {
1da177e4 LT	357	struct fw_filter *f;
1da177e4 LT	358
e35a8ee5 JF	359	for (f = rtnl_dereference(head->ht[h]); f;
e35a8ee5 JF	360	f = rtnl_dereference(f->next)) {
1da177e4 LT	361	if (arg->count < arg->skip) {
	362	arg->count++;
	363	continue;
	364	}
8113c095	365	if (arg->fn(tp, f, arg) < 0) {
1da177e4 LT	366	arg->stop = 1;
	367	return;
	368	}
	369	arg->count++;
	370	}
	371	}
	372	}
	373
8113c095	374	static int fw_dump(struct net net, struct tcf_proto tp, void *fh,
12db03b6	375	struct sk_buff skb, struct tcmsg t, bool rtnl_held)
1da177e4	376	{
e35a8ee5	377	struct fw_head *head = rtnl_dereference(tp->root);
8113c095	378	struct fw_filter *f = fh;
4b3550ef	379	struct nlattr *nest;
1da177e4 LT	380
	381	if (f == NULL)
	382	return skb->len;
	383
	384	t->tcm_handle = f->id;
	385
6fc6d06e	386	if (!f->res.classid && !tcf_exts_has_actions(&f->exts))
1da177e4 LT	387	return skb->len;
1da177e4 LT	388
ae0be8de	389	nest = nla_nest_start_noflag(skb, TCA_OPTIONS);
4b3550ef PM	390	if (nest == NULL)
4b3550ef PM	391	goto nla_put_failure;
1da177e4	392
1b34ec43 DM	393	if (f->res.classid &&
	394	nla_put_u32(skb, TCA_FW_CLASSID, f->res.classid))
	395	goto nla_put_failure;
2519a602 WC	396	if (f->ifindex) {
	397	struct net_device *dev;
	398	dev = __dev_get_by_index(net, f->ifindex);
	399	if (dev && nla_put_string(skb, TCA_FW_INDEV, dev->name))
	400	goto nla_put_failure;
	401	}
1b34ec43 DM	402	if (head->mask != 0xFFFFFFFF &&
	403	nla_put_u32(skb, TCA_FW_MASK, head->mask))
	404	goto nla_put_failure;
1da177e4	405
5da57f42	406	if (tcf_exts_dump(skb, &f->exts) < 0)
add93b61	407	goto nla_put_failure;
1da177e4	408
4b3550ef	409	nla_nest_end(skb, nest);
1da177e4	410
5da57f42	411	if (tcf_exts_dump_stats(skb, &f->exts) < 0)
add93b61	412	goto nla_put_failure;
1da177e4 LT	413
	414	return skb->len;
	415
add93b61	416	nla_put_failure:
6ea3b446	417	nla_nest_cancel(skb, nest);
1da177e4 LT	418	return -1;
	419	}
	420
2e24cd75 CW	421	static void fw_bind_class(void fh, u32 classid, unsigned long cl, void q,
2e24cd75 CW	422	unsigned long base)
07d79fc7 CW	423	{
	424	struct fw_filter *f = fh;
	425
2e24cd75 CW	426	if (f && f->res.classid == classid) {
	427	if (cl)
	428	__tcf_bind_filter(q, &f->res, base);
	429	else
	430	__tcf_unbind_filter(q, &f->res);
	431	}
07d79fc7 CW	432	}
07d79fc7 CW	433
2eb9d75c	434	static struct tcf_proto_ops cls_fw_ops __read_mostly = {
1da177e4 LT	435	.kind = "fw",
	436	.classify = fw_classify,
	437	.init = fw_init,
	438	.destroy = fw_destroy,
	439	.get = fw_get,
1da177e4 LT	440	.change = fw_change,
	441	.delete = fw_delete,
	442	.walk = fw_walk,
	443	.dump = fw_dump,
07d79fc7	444	.bind_class = fw_bind_class,
1da177e4 LT	445	.owner = THIS_MODULE,
	446	};
	447
	448	static int __init init_fw(void)
	449	{
	450	return register_tcf_proto_ops(&cls_fw_ops);
	451	}
	452
10297b99	453	static void __exit exit_fw(void)
1da177e4 LT	454	{
	455	unregister_tcf_proto_ops(&cls_fw_ops);
	456	}
	457
	458	module_init(init_fw)
	459	module_exit(exit_fw)
	460	MODULE_LICENSE("GPL");