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

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * net/sched/act_police.c	Input police filter
 *
 * Authors:	Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
 * 		J Hadi Salim (action changes)
 */

#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/skbuff.h>
#include <linux/rtnetlink.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <net/act_api.h>
#include <net/netlink.h>
#include <net/pkt_cls.h>
#include <net/tc_act/tc_police.h>

/* Each policer is serialized by its individual spinlock */

static unsigned int police_net_id;
static struct tc_action_ops act_police_ops;

static int tcf_police_walker(struct net *net, struct sk_buff *skb,
				 struct netlink_callback *cb, int type,
				 const struct tc_action_ops *ops,
				 struct netlink_ext_ack *extack)
{
	struct tc_action_net *tn = net_generic(net, police_net_id);

	return tcf_generic_walker(tn, skb, cb, type, ops, extack);
}

static const struct nla_policy police_policy[TCA_POLICE_MAX + 1] = {
	[TCA_POLICE_RATE]	= { .len = TC_RTAB_SIZE },
	[TCA_POLICE_PEAKRATE]	= { .len = TC_RTAB_SIZE },
	[TCA_POLICE_AVRATE]	= { .type = NLA_U32 },
	[TCA_POLICE_RESULT]	= { .type = NLA_U32 },
	[TCA_POLICE_RATE64]     = { .type = NLA_U64 },
	[TCA_POLICE_PEAKRATE64] = { .type = NLA_U64 },
	[TCA_POLICE_PKTRATE64]  = { .type = NLA_U64, .min = 1 },
	[TCA_POLICE_PKTBURST64] = { .type = NLA_U64, .min = 1 },
};

static int tcf_police_init(struct net *net, struct nlattr *nla,
			       struct nlattr *est, struct tc_action **a,
			       struct tcf_proto *tp, u32 flags,
			       struct netlink_ext_ack *extack)
{
	int ret = 0, tcfp_result = TC_ACT_OK, err, size;
	bool bind = flags & TCA_ACT_FLAGS_BIND;
	struct nlattr *tb[TCA_POLICE_MAX + 1];
	struct tcf_chain *goto_ch = NULL;
	struct tc_police *parm;
	struct tcf_police *police;
	struct qdisc_rate_table *R_tab = NULL, *P_tab = NULL;
	struct tc_action_net *tn = net_generic(net, police_net_id);
	struct tcf_police_params *new;
	bool exists = false;
	u32 index;
	u64 rate64, prate64;
	u64 pps, ppsburst;

	if (nla == NULL)
		return -EINVAL;

	err = nla_parse_nested_deprecated(tb, TCA_POLICE_MAX, nla,
					  police_policy, NULL);
	if (err < 0)
		return err;

	if (tb[TCA_POLICE_TBF] == NULL)
		return -EINVAL;
	size = nla_len(tb[TCA_POLICE_TBF]);
	if (size != sizeof(*parm) && size != sizeof(struct tc_police_compat))
		return -EINVAL;

	parm = nla_data(tb[TCA_POLICE_TBF]);
	index = parm->index;
	err = tcf_idr_check_alloc(tn, &index, a, bind);
	if (err < 0)
		return err;
	exists = err;
	if (exists && bind)
		return 0;

	if (!exists) {
		ret = tcf_idr_create(tn, index, NULL, a,
				     &act_police_ops, bind, true, flags);
		if (ret) {
			tcf_idr_cleanup(tn, index);
			return ret;
		}
		ret = ACT_P_CREATED;
		spin_lock_init(&(to_police(*a)->tcfp_lock));
	} else if (!(flags & TCA_ACT_FLAGS_REPLACE)) {
		tcf_idr_release(*a, bind);
		return -EEXIST;
	}
	err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack);
	if (err < 0)
		goto release_idr;

	police = to_police(*a);
	if (parm->rate.rate) {
		err = -ENOMEM;
		R_tab = qdisc_get_rtab(&parm->rate, tb[TCA_POLICE_RATE], NULL);
		if (R_tab == NULL)
			goto failure;

		if (parm->peakrate.rate) {
			P_tab = qdisc_get_rtab(&parm->peakrate,
					       tb[TCA_POLICE_PEAKRATE], NULL);
			if (P_tab == NULL)
				goto failure;
		}
	}

	if (est) {
		err = gen_replace_estimator(&police->tcf_bstats,
					    police->common.cpu_bstats,
					    &police->tcf_rate_est,
					    &police->tcf_lock,
					    false, est);
		if (err)
			goto failure;
	} else if (tb[TCA_POLICE_AVRATE] &&
		   (ret == ACT_P_CREATED ||
		    !gen_estimator_active(&police->tcf_rate_est))) {
		err = -EINVAL;
		goto failure;
	}

	if (tb[TCA_POLICE_RESULT]) {
		tcfp_result = nla_get_u32(tb[TCA_POLICE_RESULT]);
		if (TC_ACT_EXT_CMP(tcfp_result, TC_ACT_GOTO_CHAIN)) {
			NL_SET_ERR_MSG(extack,
				       "goto chain not allowed on fallback");
			err = -EINVAL;
			goto failure;
		}
	}

	if ((tb[TCA_POLICE_PKTRATE64] && !tb[TCA_POLICE_PKTBURST64]) ||
	    (!tb[TCA_POLICE_PKTRATE64] && tb[TCA_POLICE_PKTBURST64])) {
		NL_SET_ERR_MSG(extack,
			       "Both or neither packet-per-second burst and rate must be provided");
		err = -EINVAL;
		goto failure;
	}

	if (tb[TCA_POLICE_PKTRATE64] && R_tab) {
		NL_SET_ERR_MSG(extack,
			       "packet-per-second and byte-per-second rate limits not allowed in same action");
		err = -EINVAL;
		goto failure;
	}

	new = kzalloc(sizeof(*new), GFP_KERNEL);
	if (unlikely(!new)) {
		err = -ENOMEM;
		goto failure;
	}

	/* No failure allowed after this point */
	new->tcfp_result = tcfp_result;
	new->tcfp_mtu = parm->mtu;
	if (!new->tcfp_mtu) {
		new->tcfp_mtu = ~0;
		if (R_tab)
			new->tcfp_mtu = 255 << R_tab->rate.cell_log;
	}
	if (R_tab) {
		new->rate_present = true;
		rate64 = tb[TCA_POLICE_RATE64] ?
			 nla_get_u64(tb[TCA_POLICE_RATE64]) : 0;
		psched_ratecfg_precompute(&new->rate, &R_tab->rate, rate64);
		qdisc_put_rtab(R_tab);
	} else {
		new->rate_present = false;
	}
	if (P_tab) {
		new->peak_present = true;
		prate64 = tb[TCA_POLICE_PEAKRATE64] ?
			  nla_get_u64(tb[TCA_POLICE_PEAKRATE64]) : 0;
		psched_ratecfg_precompute(&new->peak, &P_tab->rate, prate64);
		qdisc_put_rtab(P_tab);
	} else {
		new->peak_present = false;
	}

	new->tcfp_burst = PSCHED_TICKS2NS(parm->burst);
	if (new->peak_present)
		new->tcfp_mtu_ptoks = (s64)psched_l2t_ns(&new->peak,
							 new->tcfp_mtu);

	if (tb[TCA_POLICE_AVRATE])
		new->tcfp_ewma_rate = nla_get_u32(tb[TCA_POLICE_AVRATE]);

	if (tb[TCA_POLICE_PKTRATE64]) {
		pps = nla_get_u64(tb[TCA_POLICE_PKTRATE64]);
		ppsburst = nla_get_u64(tb[TCA_POLICE_PKTBURST64]);
		new->pps_present = true;
		new->tcfp_pkt_burst = PSCHED_TICKS2NS(ppsburst);
		psched_ppscfg_precompute(&new->ppsrate, pps);
	}

	spin_lock_bh(&police->tcf_lock);
	spin_lock_bh(&police->tcfp_lock);
	police->tcfp_t_c = ktime_get_ns();
	police->tcfp_toks = new->tcfp_burst;
	if (new->peak_present)
		police->tcfp_ptoks = new->tcfp_mtu_ptoks;
	spin_unlock_bh(&police->tcfp_lock);
	goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
	new = rcu_replace_pointer(police->params,
				  new,
				  lockdep_is_held(&police->tcf_lock));
	spin_unlock_bh(&police->tcf_lock);

	if (goto_ch)
		tcf_chain_put_by_act(goto_ch);
	if (new)
		kfree_rcu(new, rcu);

	return ret;

failure:
	qdisc_put_rtab(P_tab);
	qdisc_put_rtab(R_tab);
	if (goto_ch)
		tcf_chain_put_by_act(goto_ch);
release_idr:
	tcf_idr_release(*a, bind);
	return err;
}

static bool tcf_police_mtu_check(struct sk_buff *skb, u32 limit)
{
	u32 len;

	if (skb_is_gso(skb))
		return skb_gso_validate_mac_len(skb, limit);

	len = qdisc_pkt_len(skb);
	if (skb_at_tc_ingress(skb))
		len += skb->mac_len;

	return len <= limit;
}

static int tcf_police_act(struct sk_buff *skb, const struct tc_action *a,
			  struct tcf_result *res)
{
	struct tcf_police *police = to_police(a);
	s64 now, toks, ppstoks = 0, ptoks = 0;
	struct tcf_police_params *p;
	int ret;

	tcf_lastuse_update(&police->tcf_tm);
	bstats_update(this_cpu_ptr(police->common.cpu_bstats), skb);

	ret = READ_ONCE(police->tcf_action);
	p = rcu_dereference_bh(police->params);

	if (p->tcfp_ewma_rate) {
		struct gnet_stats_rate_est64 sample;

		if (!gen_estimator_read(&police->tcf_rate_est, &sample) ||
		    sample.bps >= p->tcfp_ewma_rate)
			goto inc_overlimits;
	}

	if (tcf_police_mtu_check(skb, p->tcfp_mtu)) {
		if (!p->rate_present && !p->pps_present) {
			ret = p->tcfp_result;
			goto end;
		}

		now = ktime_get_ns();
		spin_lock_bh(&police->tcfp_lock);
		toks = min_t(s64, now - police->tcfp_t_c, p->tcfp_burst);
		if (p->peak_present) {
			ptoks = toks + police->tcfp_ptoks;
			if (ptoks > p->tcfp_mtu_ptoks)
				ptoks = p->tcfp_mtu_ptoks;
			ptoks -= (s64)psched_l2t_ns(&p->peak,
						    qdisc_pkt_len(skb));
		}
		if (p->rate_present) {
			toks += police->tcfp_toks;
			if (toks > p->tcfp_burst)
				toks = p->tcfp_burst;
			toks -= (s64)psched_l2t_ns(&p->rate, qdisc_pkt_len(skb));
		} else if (p->pps_present) {
			ppstoks = min_t(s64, now - police->tcfp_t_c, p->tcfp_pkt_burst);
			ppstoks += police->tcfp_pkttoks;
			if (ppstoks > p->tcfp_pkt_burst)
				ppstoks = p->tcfp_pkt_burst;
			ppstoks -= (s64)psched_pkt2t_ns(&p->ppsrate, 1);
		}
		if ((toks | ptoks | ppstoks) >= 0) {
			police->tcfp_t_c = now;
			police->tcfp_toks = toks;
			police->tcfp_ptoks = ptoks;
			police->tcfp_pkttoks = ppstoks;
			spin_unlock_bh(&police->tcfp_lock);
			ret = p->tcfp_result;
			goto inc_drops;
		}
		spin_unlock_bh(&police->tcfp_lock);
	}

inc_overlimits:
	qstats_overlimit_inc(this_cpu_ptr(police->common.cpu_qstats));
inc_drops:
	if (ret == TC_ACT_SHOT)
		qstats_drop_inc(this_cpu_ptr(police->common.cpu_qstats));
end:
	return ret;
}

static void tcf_police_cleanup(struct tc_action *a)
{
	struct tcf_police *police = to_police(a);
	struct tcf_police_params *p;

	p = rcu_dereference_protected(police->params, 1);
	if (p)
		kfree_rcu(p, rcu);
}

static void tcf_police_stats_update(struct tc_action *a,
				    u64 bytes, u64 packets, u64 drops,
				    u64 lastuse, bool hw)
{
	struct tcf_police *police = to_police(a);
	struct tcf_t *tm = &police->tcf_tm;

	tcf_action_update_stats(a, bytes, packets, drops, hw);
	tm->lastuse = max_t(u64, tm->lastuse, lastuse);
}

static int tcf_police_dump(struct sk_buff *skb, struct tc_action *a,
			       int bind, int ref)
{
	unsigned char *b = skb_tail_pointer(skb);
	struct tcf_police *police = to_police(a);
	struct tcf_police_params *p;
	struct tc_police opt = {
		.index = police->tcf_index,
		.refcnt = refcount_read(&police->tcf_refcnt) - ref,
		.bindcnt = atomic_read(&police->tcf_bindcnt) - bind,
	};
	struct tcf_t t;

	spin_lock_bh(&police->tcf_lock);
	opt.action = police->tcf_action;
	p = rcu_dereference_protected(police->params,
				      lockdep_is_held(&police->tcf_lock));
	opt.mtu = p->tcfp_mtu;
	opt.burst = PSCHED_NS2TICKS(p->tcfp_burst);
	if (p->rate_present) {
		psched_ratecfg_getrate(&opt.rate, &p->rate);
		if ((police->params->rate.rate_bytes_ps >= (1ULL << 32)) &&
		    nla_put_u64_64bit(skb, TCA_POLICE_RATE64,
				      police->params->rate.rate_bytes_ps,
				      TCA_POLICE_PAD))
			goto nla_put_failure;
	}
	if (p->peak_present) {
		psched_ratecfg_getrate(&opt.peakrate, &p->peak);
		if ((police->params->peak.rate_bytes_ps >= (1ULL << 32)) &&
		    nla_put_u64_64bit(skb, TCA_POLICE_PEAKRATE64,
				      police->params->peak.rate_bytes_ps,
				      TCA_POLICE_PAD))
			goto nla_put_failure;
	}
	if (p->pps_present) {
		if (nla_put_u64_64bit(skb, TCA_POLICE_PKTRATE64,
				      police->params->ppsrate.rate_pkts_ps,
				      TCA_POLICE_PAD))
			goto nla_put_failure;
		if (nla_put_u64_64bit(skb, TCA_POLICE_PKTBURST64,
				      PSCHED_NS2TICKS(p->tcfp_pkt_burst),
				      TCA_POLICE_PAD))
			goto nla_put_failure;
	}
	if (nla_put(skb, TCA_POLICE_TBF, sizeof(opt), &opt))
		goto nla_put_failure;
	if (p->tcfp_result &&
	    nla_put_u32(skb, TCA_POLICE_RESULT, p->tcfp_result))
		goto nla_put_failure;
	if (p->tcfp_ewma_rate &&
	    nla_put_u32(skb, TCA_POLICE_AVRATE, p->tcfp_ewma_rate))
		goto nla_put_failure;

	tcf_tm_dump(&t, &police->tcf_tm);
	if (nla_put_64bit(skb, TCA_POLICE_TM, sizeof(t), &t, TCA_POLICE_PAD))
		goto nla_put_failure;
	spin_unlock_bh(&police->tcf_lock);

	return skb->len;

nla_put_failure:
	spin_unlock_bh(&police->tcf_lock);
	nlmsg_trim(skb, b);
	return -1;
}

static int tcf_police_search(struct net *net, struct tc_action **a, u32 index)
{
	struct tc_action_net *tn = net_generic(net, police_net_id);

	return tcf_idr_search(tn, a, index);
}

static int tcf_police_act_to_flow_act(int tc_act, u32 *extval,
				      struct netlink_ext_ack *extack)
{
	int act_id = -EOPNOTSUPP;

	if (!TC_ACT_EXT_OPCODE(tc_act)) {
		if (tc_act == TC_ACT_OK)
			act_id = FLOW_ACTION_ACCEPT;
		else if (tc_act ==  TC_ACT_SHOT)
			act_id = FLOW_ACTION_DROP;
		else if (tc_act == TC_ACT_PIPE)
			act_id = FLOW_ACTION_PIPE;
		else if (tc_act == TC_ACT_RECLASSIFY)
			NL_SET_ERR_MSG_MOD(extack, "Offload not supported when conform/exceed action is \"reclassify\"");
		else
			NL_SET_ERR_MSG_MOD(extack, "Unsupported conform/exceed action offload");
	} else if (TC_ACT_EXT_CMP(tc_act, TC_ACT_GOTO_CHAIN)) {
		act_id = FLOW_ACTION_GOTO;
		*extval = tc_act & TC_ACT_EXT_VAL_MASK;
	} else if (TC_ACT_EXT_CMP(tc_act, TC_ACT_JUMP)) {
		act_id = FLOW_ACTION_JUMP;
		*extval = tc_act & TC_ACT_EXT_VAL_MASK;
	} else if (tc_act == TC_ACT_UNSPEC) {
		NL_SET_ERR_MSG_MOD(extack, "Offload not supported when conform/exceed action is \"continue\"");
	} else {
		NL_SET_ERR_MSG_MOD(extack, "Unsupported conform/exceed action offload");
	}

	return act_id;
}

static int tcf_police_offload_act_setup(struct tc_action *act, void *entry_data,
					u32 *index_inc, bool bind,
					struct netlink_ext_ack *extack)
{
	if (bind) {
		struct flow_action_entry *entry = entry_data;
		struct tcf_police *police = to_police(act);
		struct tcf_police_params *p;
		int act_id;

		p = rcu_dereference_protected(police->params,
					      lockdep_is_held(&police->tcf_lock));

		entry->id = FLOW_ACTION_POLICE;
		entry->police.burst = tcf_police_burst(act);
		entry->police.rate_bytes_ps =
			tcf_police_rate_bytes_ps(act);
		entry->police.peakrate_bytes_ps = tcf_police_peakrate_bytes_ps(act);
		entry->police.avrate = tcf_police_tcfp_ewma_rate(act);
		entry->police.overhead = tcf_police_rate_overhead(act);
		entry->police.burst_pkt = tcf_police_burst_pkt(act);
		entry->police.rate_pkt_ps =
			tcf_police_rate_pkt_ps(act);
		entry->police.mtu = tcf_police_tcfp_mtu(act);

		act_id = tcf_police_act_to_flow_act(police->tcf_action,
						    &entry->police.exceed.extval,
						    extack);
		if (act_id < 0)
			return act_id;

		entry->police.exceed.act_id = act_id;

		act_id = tcf_police_act_to_flow_act(p->tcfp_result,
						    &entry->police.notexceed.extval,
						    extack);
		if (act_id < 0)
			return act_id;

		entry->police.notexceed.act_id = act_id;

		*index_inc = 1;
	} else {
		struct flow_offload_action *fl_action = entry_data;

		fl_action->id = FLOW_ACTION_POLICE;
	}

	return 0;
}

MODULE_AUTHOR("Alexey Kuznetsov");
MODULE_DESCRIPTION("Policing actions");
MODULE_LICENSE("GPL");

static struct tc_action_ops act_police_ops = {
	.kind		=	"police",
	.id		=	TCA_ID_POLICE,
	.owner		=	THIS_MODULE,
	.stats_update	=	tcf_police_stats_update,
	.act		=	tcf_police_act,
	.dump		=	tcf_police_dump,
	.init		=	tcf_police_init,
	.walk		=	tcf_police_walker,
	.lookup		=	tcf_police_search,
	.cleanup	=	tcf_police_cleanup,
	.offload_act_setup =	tcf_police_offload_act_setup,
	.size		=	sizeof(struct tcf_police),
};

static __net_init int police_init_net(struct net *net)
{
	struct tc_action_net *tn = net_generic(net, police_net_id);

	return tc_action_net_init(net, tn, &act_police_ops);
}

static void __net_exit police_exit_net(struct list_head *net_list)
{
	tc_action_net_exit(net_list, police_net_id);
}

static struct pernet_operations police_net_ops = {
	.init = police_init_net,
	.exit_batch = police_exit_net,
	.id   = &police_net_id,
	.size = sizeof(struct tc_action_net),
};

static int __init police_init_module(void)
{
	return tcf_register_action(&act_police_ops, &police_net_ops);
}

static void __exit police_cleanup_module(void)
{
	tcf_unregister_action(&act_police_ops, &police_net_ops);
}

module_init(police_init_module);
module_exit(police_cleanup_module);
Commit	Line	Data
2874c5fd	1	// SPDX-License-Identifier: GPL-2.0-or-later
1da177e4	2	/*
0c6965dd	3	* net/sched/act_police.c Input police filter
1da177e4	4	*
1da177e4 LT	5	* Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
	6	* J Hadi Salim (action changes)
	7	*/
	8
1da177e4 LT	9	#include <linux/module.h>
	10	#include <linux/types.h>
	11	#include <linux/kernel.h>
1da177e4	12	#include <linux/string.h>
1da177e4	13	#include <linux/errno.h>
1da177e4	14	#include <linux/skbuff.h>
1da177e4 LT	15	#include <linux/rtnetlink.h>
1da177e4 LT	16	#include <linux/init.h>
5a0e3ad6	17	#include <linux/slab.h>
1da177e4	18	#include <net/act_api.h>
dc5fc579	19	#include <net/netlink.h>
d6124d6b	20	#include <net/pkt_cls.h>
fa762da9	21	#include <net/tc_act/tc_police.h>
1e9b3d53	22
e9ce1cd3	23	/* Each policer is serialized by its individual spinlock */
1da177e4	24
c7d03a00	25	static unsigned int police_net_id;
a85a970a	26	static struct tc_action_ops act_police_ops;
ddf97ccd	27
2ac06347	28	static int tcf_police_walker(struct net net, struct sk_buff skb,
ddf97ccd	29	struct netlink_callback *cb, int type,
41780105 AA	30	const struct tc_action_ops *ops,
41780105 AA	31	struct netlink_ext_ack *extack)
1da177e4	32	{
ddf97ccd	33	struct tc_action_net *tn = net_generic(net, police_net_id);
1da177e4	34
b3620145	35	return tcf_generic_walker(tn, skb, cb, type, ops, extack);
1da177e4	36	}
1da177e4	37
53b2bf3f PM	38	static const struct nla_policy police_policy[TCA_POLICE_MAX + 1] = {
	39	[TCA_POLICE_RATE] = { .len = TC_RTAB_SIZE },
	40	[TCA_POLICE_PEAKRATE] = { .len = TC_RTAB_SIZE },
	41	[TCA_POLICE_AVRATE] = { .type = NLA_U32 },
	42	[TCA_POLICE_RESULT] = { .type = NLA_U32 },
d1967e49 DD	43	[TCA_POLICE_RATE64] = { .type = NLA_U64 },
d1967e49 DD	44	[TCA_POLICE_PEAKRATE64] = { .type = NLA_U64 },
2ffe0395 BZ	45	[TCA_POLICE_PKTRATE64] = { .type = NLA_U64, .min = 1 },
2ffe0395 BZ	46	[TCA_POLICE_PKTBURST64] = { .type = NLA_U64, .min = 1 },
53b2bf3f PM	47	};
53b2bf3f PM	48
2ac06347	49	static int tcf_police_init(struct net net, struct nlattr nla,
a85a970a	50	struct nlattr est, struct tc_action *a,
abbb0d33	51	struct tcf_proto *tp, u32 flags,
589dad6d	52	struct netlink_ext_ack *extack)
1da177e4	53	{
fd6d4338	54	int ret = 0, tcfp_result = TC_ACT_OK, err, size;
695176bf	55	bool bind = flags & TCA_ACT_FLAGS_BIND;
7ba699c6	56	struct nlattr *tb[TCA_POLICE_MAX + 1];
d6124d6b	57	struct tcf_chain *goto_ch = NULL;
1da177e4	58	struct tc_police *parm;
e9ce1cd3	59	struct tcf_police *police;
1da177e4	60	struct qdisc_rate_table R_tab = NULL, P_tab = NULL;
ddf97ccd	61	struct tc_action_net *tn = net_generic(net, police_net_id);
2d550dba	62	struct tcf_police_params *new;
0852e455	63	bool exists = false;
7be8ef2c	64	u32 index;
d1967e49	65	u64 rate64, prate64;
2ffe0395	66	u64 pps, ppsburst;
1da177e4	67
cee63723	68	if (nla == NULL)
1da177e4 LT	69	return -EINVAL;
1da177e4 LT	70
8cb08174 JB	71	err = nla_parse_nested_deprecated(tb, TCA_POLICE_MAX, nla,
8cb08174 JB	72	police_policy, NULL);
cee63723 PM	73	if (err < 0)
	74	return err;
	75
7ba699c6	76	if (tb[TCA_POLICE_TBF] == NULL)
1e9b3d53	77	return -EINVAL;
7ba699c6	78	size = nla_len(tb[TCA_POLICE_TBF]);
1e9b3d53	79	if (size != sizeof(*parm) && size != sizeof(struct tc_police_compat))
1da177e4	80	return -EINVAL;
0852e455	81
7ba699c6	82	parm = nla_data(tb[TCA_POLICE_TBF]);
7be8ef2c DL	83	index = parm->index;
7be8ef2c DL	84	err = tcf_idr_check_alloc(tn, &index, a, bind);
0190c1d4 VB	85	if (err < 0)
	86	return err;
	87	exists = err;
0852e455 WC	88	if (exists && bind)
0852e455 WC	89	return 0;
1da177e4	90
0852e455	91	if (!exists) {
7be8ef2c	92	ret = tcf_idr_create(tn, index, NULL, a,
40bd094d	93	&act_police_ops, bind, true, flags);
0190c1d4	94	if (ret) {
7be8ef2c	95	tcf_idr_cleanup(tn, index);
a03e6fe5	96	return ret;
0190c1d4	97	}
a03e6fe5	98	ret = ACT_P_CREATED;
484afd1b	99	spin_lock_init(&(to_police(*a)->tcfp_lock));
695176bf	100	} else if (!(flags & TCA_ACT_FLAGS_REPLACE)) {
65a206c0	101	tcf_idr_release(*a, bind);
4e8ddd7f	102	return -EEXIST;
1da177e4	103	}
d6124d6b DC	104	err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack);
	105	if (err < 0)
	106	goto release_idr;
1da177e4	107
a85a970a	108	police = to_police(*a);
1da177e4 LT	109	if (parm->rate.rate) {
1da177e4 LT	110	err = -ENOMEM;
e9bc3fa2	111	R_tab = qdisc_get_rtab(&parm->rate, tb[TCA_POLICE_RATE], NULL);
1da177e4 LT	112	if (R_tab == NULL)
1da177e4 LT	113	goto failure;
c1b56878	114
1da177e4 LT	115	if (parm->peakrate.rate) {
1da177e4 LT	116	P_tab = qdisc_get_rtab(&parm->peakrate,
e9bc3fa2	117	tb[TCA_POLICE_PEAKRATE], NULL);
71bcb09a	118	if (P_tab == NULL)
1da177e4	119	goto failure;
1da177e4 LT	120	}
1da177e4 LT	121	}
71bcb09a	122
71bcb09a	123	if (est) {
93be42f9 DC	124	err = gen_replace_estimator(&police->tcf_bstats,
93be42f9 DC	125	police->common.cpu_bstats,
71bcb09a	126	&police->tcf_rate_est,
edb09eb1	127	&police->tcf_lock,
29cbcd85	128	false, est);
71bcb09a	129	if (err)
74030603	130	goto failure;
a883bf56 JP	131	} else if (tb[TCA_POLICE_AVRATE] &&
a883bf56 JP	132	(ret == ACT_P_CREATED \|\|
1c0d32fd	133	!gen_estimator_active(&police->tcf_rate_est))) {
a883bf56	134	err = -EINVAL;
74030603	135	goto failure;
71bcb09a SH	136	}
71bcb09a SH	137
fd6d4338 DC	138	if (tb[TCA_POLICE_RESULT]) {
	139	tcfp_result = nla_get_u32(tb[TCA_POLICE_RESULT]);
	140	if (TC_ACT_EXT_CMP(tcfp_result, TC_ACT_GOTO_CHAIN)) {
	141	NL_SET_ERR_MSG(extack,
	142	"goto chain not allowed on fallback");
	143	err = -EINVAL;
	144	goto failure;
	145	}
	146	}
	147
2ffe0395 BZ	148	if ((tb[TCA_POLICE_PKTRATE64] && !tb[TCA_POLICE_PKTBURST64]) \|\|
	149	(!tb[TCA_POLICE_PKTRATE64] && tb[TCA_POLICE_PKTBURST64])) {
	150	NL_SET_ERR_MSG(extack,
	151	"Both or neither packet-per-second burst and rate must be provided");
	152	err = -EINVAL;
	153	goto failure;
	154	}
	155
	156	if (tb[TCA_POLICE_PKTRATE64] && R_tab) {
	157	NL_SET_ERR_MSG(extack,
	158	"packet-per-second and byte-per-second rate limits not allowed in same action");
	159	err = -EINVAL;
	160	goto failure;
	161	}
	162
2d550dba DC	163	new = kzalloc(sizeof(*new), GFP_KERNEL);
	164	if (unlikely(!new)) {
	165	err = -ENOMEM;
	166	goto failure;
	167	}
	168
71bcb09a	169	/* No failure allowed after this point */
fd6d4338	170	new->tcfp_result = tcfp_result;
2d550dba DC	171	new->tcfp_mtu = parm->mtu;
	172	if (!new->tcfp_mtu) {
	173	new->tcfp_mtu = ~0;
c6d14ff1	174	if (R_tab)
2d550dba	175	new->tcfp_mtu = 255 << R_tab->rate.cell_log;
c6d14ff1 JP	176	}
c6d14ff1 JP	177	if (R_tab) {
2d550dba	178	new->rate_present = true;
d1967e49 DD	179	rate64 = tb[TCA_POLICE_RATE64] ?
	180	nla_get_u64(tb[TCA_POLICE_RATE64]) : 0;
	181	psched_ratecfg_precompute(&new->rate, &R_tab->rate, rate64);
c6d14ff1 JP	182	qdisc_put_rtab(R_tab);
c6d14ff1 JP	183	} else {
2d550dba	184	new->rate_present = false;
1da177e4	185	}
c6d14ff1	186	if (P_tab) {
2d550dba	187	new->peak_present = true;
d1967e49 DD	188	prate64 = tb[TCA_POLICE_PEAKRATE64] ?
	189	nla_get_u64(tb[TCA_POLICE_PEAKRATE64]) : 0;
	190	psched_ratecfg_precompute(&new->peak, &P_tab->rate, prate64);
c6d14ff1 JP	191	qdisc_put_rtab(P_tab);
c6d14ff1 JP	192	} else {
2d550dba	193	new->peak_present = false;
1da177e4 LT	194	}
1da177e4 LT	195
2d550dba	196	new->tcfp_burst = PSCHED_TICKS2NS(parm->burst);
f2cbd485	197	if (new->peak_present)
2d550dba DC	198	new->tcfp_mtu_ptoks = (s64)psched_l2t_ns(&new->peak,
2d550dba DC	199	new->tcfp_mtu);
1da177e4	200
7ba699c6	201	if (tb[TCA_POLICE_AVRATE])
2d550dba	202	new->tcfp_ewma_rate = nla_get_u32(tb[TCA_POLICE_AVRATE]);
1da177e4	203
2ffe0395 BZ	204	if (tb[TCA_POLICE_PKTRATE64]) {
	205	pps = nla_get_u64(tb[TCA_POLICE_PKTRATE64]);
	206	ppsburst = nla_get_u64(tb[TCA_POLICE_PKTBURST64]);
	207	new->pps_present = true;
	208	new->tcfp_pkt_burst = PSCHED_TICKS2NS(ppsburst);
	209	psched_ppscfg_precompute(&new->ppsrate, pps);
	210	}
	211
2d550dba	212	spin_lock_bh(&police->tcf_lock);
f2cbd485 DC	213	spin_lock_bh(&police->tcfp_lock);
	214	police->tcfp_t_c = ktime_get_ns();
	215	police->tcfp_toks = new->tcfp_burst;
	216	if (new->peak_present)
	217	police->tcfp_ptoks = new->tcfp_mtu_ptoks;
	218	spin_unlock_bh(&police->tcfp_lock);
d6124d6b	219	goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
445d3749 PM	220	new = rcu_replace_pointer(police->params,
	221	new,
	222	lockdep_is_held(&police->tcf_lock));
e9ce1cd3	223	spin_unlock_bh(&police->tcf_lock);
1da177e4	224
d6124d6b DC	225	if (goto_ch)
d6124d6b DC	226	tcf_chain_put_by_act(goto_ch);
2d550dba DC	227	if (new)
2d550dba DC	228	kfree_rcu(new, rcu);
1da177e4	229
1da177e4 LT	230	return ret;
	231
	232	failure:
3b69a4c9 YY	233	qdisc_put_rtab(P_tab);
3b69a4c9 YY	234	qdisc_put_rtab(R_tab);
d6124d6b DC	235	if (goto_ch)
	236	tcf_chain_put_by_act(goto_ch);
	237	release_idr:
4e8ddd7f	238	tcf_idr_release(*a, bind);
1da177e4 LT	239	return err;
	240	}
	241
4ddc844e DC	242	static bool tcf_police_mtu_check(struct sk_buff *skb, u32 limit)
	243	{
	244	u32 len;
	245
	246	if (skb_is_gso(skb))
	247	return skb_gso_validate_mac_len(skb, limit);
	248
	249	len = qdisc_pkt_len(skb);
	250	if (skb_at_tc_ingress(skb))
	251	len += skb->mac_len;
	252
	253	return len <= limit;
	254	}
	255
2ac06347	256	static int tcf_police_act(struct sk_buff skb, const struct tc_action a,
10297b99	257	struct tcf_result *res)
1da177e4	258	{
a85a970a	259	struct tcf_police *police = to_police(a);
2ffe0395	260	s64 now, toks, ppstoks = 0, ptoks = 0;
2d550dba	261	struct tcf_police_params *p;
93be42f9	262	int ret;
1da177e4	263
3d3ed181	264	tcf_lastuse_update(&police->tcf_tm);
50dc9a85	265	bstats_update(this_cpu_ptr(police->common.cpu_bstats), skb);
1da177e4	266
2d550dba DC	267	ret = READ_ONCE(police->tcf_action);
	268	p = rcu_dereference_bh(police->params);
	269
	270	if (p->tcfp_ewma_rate) {
1c0d32fd ED	271	struct gnet_stats_rate_est64 sample;
	272
	273	if (!gen_estimator_read(&police->tcf_rate_est, &sample) \|\|
2d550dba	274	sample.bps >= p->tcfp_ewma_rate)
93be42f9	275	goto inc_overlimits;
1da177e4	276	}
1da177e4	277
4ddc844e	278	if (tcf_police_mtu_check(skb, p->tcfp_mtu)) {
2ffe0395	279	if (!p->rate_present && !p->pps_present) {
2d550dba DC	280	ret = p->tcfp_result;
2d550dba DC	281	goto end;
1da177e4 LT	282	}
1da177e4 LT	283
d2de875c	284	now = ktime_get_ns();
f2cbd485 DC	285	spin_lock_bh(&police->tcfp_lock);
f2cbd485 DC	286	toks = min_t(s64, now - police->tcfp_t_c, p->tcfp_burst);
2d550dba	287	if (p->peak_present) {
f2cbd485	288	ptoks = toks + police->tcfp_ptoks;
2d550dba DC	289	if (ptoks > p->tcfp_mtu_ptoks)
	290	ptoks = p->tcfp_mtu_ptoks;
	291	ptoks -= (s64)psched_l2t_ns(&p->peak,
	292	qdisc_pkt_len(skb));
1da177e4	293	}
2ffe0395 BZ	294	if (p->rate_present) {
	295	toks += police->tcfp_toks;
	296	if (toks > p->tcfp_burst)
	297	toks = p->tcfp_burst;
	298	toks -= (s64)psched_l2t_ns(&p->rate, qdisc_pkt_len(skb));
	299	} else if (p->pps_present) {
	300	ppstoks = min_t(s64, now - police->tcfp_t_c, p->tcfp_pkt_burst);
	301	ppstoks += police->tcfp_pkttoks;
	302	if (ppstoks > p->tcfp_pkt_burst)
	303	ppstoks = p->tcfp_pkt_burst;
	304	ppstoks -= (s64)psched_pkt2t_ns(&p->ppsrate, 1);
	305	}
	306	if ((toks \| ptoks \| ppstoks) >= 0) {
f2cbd485 DC	307	police->tcfp_t_c = now;
	308	police->tcfp_toks = toks;
	309	police->tcfp_ptoks = ptoks;
2ffe0395	310	police->tcfp_pkttoks = ppstoks;
f2cbd485	311	spin_unlock_bh(&police->tcfp_lock);
2d550dba	312	ret = p->tcfp_result;
93be42f9	313	goto inc_drops;
1da177e4	314	}
f2cbd485	315	spin_unlock_bh(&police->tcfp_lock);
1da177e4	316	}
93be42f9 DC	317
	318	inc_overlimits:
	319	qstats_overlimit_inc(this_cpu_ptr(police->common.cpu_qstats));
	320	inc_drops:
	321	if (ret == TC_ACT_SHOT)
	322	qstats_drop_inc(this_cpu_ptr(police->common.cpu_qstats));
2d550dba	323	end:
93be42f9	324	return ret;
1da177e4 LT	325	}
1da177e4 LT	326
2d550dba DC	327	static void tcf_police_cleanup(struct tc_action *a)
	328	{
	329	struct tcf_police *police = to_police(a);
	330	struct tcf_police_params *p;
	331
	332	p = rcu_dereference_protected(police->params, 1);
	333	if (p)
	334	kfree_rcu(p, rcu);
	335	}
	336
12f02b6b	337	static void tcf_police_stats_update(struct tc_action *a,
4b61d3e8	338	u64 bytes, u64 packets, u64 drops,
12f02b6b PJV	339	u64 lastuse, bool hw)
	340	{
	341	struct tcf_police *police = to_police(a);
	342	struct tcf_t *tm = &police->tcf_tm;
	343
4b61d3e8	344	tcf_action_update_stats(a, bytes, packets, drops, hw);
12f02b6b PJV	345	tm->lastuse = max_t(u64, tm->lastuse, lastuse);
	346	}
	347
2ac06347	348	static int tcf_police_dump(struct sk_buff skb, struct tc_action a,
5a7a5555	349	int bind, int ref)
1da177e4	350	{
27a884dc	351	unsigned char *b = skb_tail_pointer(skb);
a85a970a	352	struct tcf_police *police = to_police(a);
2d550dba	353	struct tcf_police_params *p;
0f04cfd0 JM	354	struct tc_police opt = {
0f04cfd0 JM	355	.index = police->tcf_index,
036bb443 VB	356	.refcnt = refcount_read(&police->tcf_refcnt) - ref,
036bb443 VB	357	.bindcnt = atomic_read(&police->tcf_bindcnt) - bind,
0f04cfd0	358	};
3d3ed181	359	struct tcf_t t;
0f04cfd0	360
e329bc42 VB	361	spin_lock_bh(&police->tcf_lock);
e329bc42 VB	362	opt.action = police->tcf_action;
2d550dba DC	363	p = rcu_dereference_protected(police->params,
	364	lockdep_is_held(&police->tcf_lock));
	365	opt.mtu = p->tcfp_mtu;
	366	opt.burst = PSCHED_NS2TICKS(p->tcfp_burst);
d1967e49	367	if (p->rate_present) {
2d550dba	368	psched_ratecfg_getrate(&opt.rate, &p->rate);
d1967e49 DD	369	if ((police->params->rate.rate_bytes_ps >= (1ULL << 32)) &&
	370	nla_put_u64_64bit(skb, TCA_POLICE_RATE64,
	371	police->params->rate.rate_bytes_ps,
	372	TCA_POLICE_PAD))
	373	goto nla_put_failure;
	374	}
	375	if (p->peak_present) {
2d550dba	376	psched_ratecfg_getrate(&opt.peakrate, &p->peak);
d1967e49 DD	377	if ((police->params->peak.rate_bytes_ps >= (1ULL << 32)) &&
	378	nla_put_u64_64bit(skb, TCA_POLICE_PEAKRATE64,
	379	police->params->peak.rate_bytes_ps,
	380	TCA_POLICE_PAD))
	381	goto nla_put_failure;
	382	}
2ffe0395 BZ	383	if (p->pps_present) {
	384	if (nla_put_u64_64bit(skb, TCA_POLICE_PKTRATE64,
	385	police->params->ppsrate.rate_pkts_ps,
	386	TCA_POLICE_PAD))
	387	goto nla_put_failure;
	388	if (nla_put_u64_64bit(skb, TCA_POLICE_PKTBURST64,
	389	PSCHED_NS2TICKS(p->tcfp_pkt_burst),
	390	TCA_POLICE_PAD))
	391	goto nla_put_failure;
	392	}
1b34ec43 DM	393	if (nla_put(skb, TCA_POLICE_TBF, sizeof(opt), &opt))
1b34ec43 DM	394	goto nla_put_failure;
2d550dba DC	395	if (p->tcfp_result &&
2d550dba DC	396	nla_put_u32(skb, TCA_POLICE_RESULT, p->tcfp_result))
1b34ec43	397	goto nla_put_failure;
2d550dba DC	398	if (p->tcfp_ewma_rate &&
2d550dba DC	399	nla_put_u32(skb, TCA_POLICE_AVRATE, p->tcfp_ewma_rate))
1b34ec43	400	goto nla_put_failure;
3d3ed181	401
985fd98a	402	tcf_tm_dump(&t, &police->tcf_tm);
3d3ed181 JHS	403	if (nla_put_64bit(skb, TCA_POLICE_TM, sizeof(t), &t, TCA_POLICE_PAD))
3d3ed181 JHS	404	goto nla_put_failure;
e329bc42	405	spin_unlock_bh(&police->tcf_lock);
3d3ed181	406
1da177e4 LT	407	return skb->len;
1da177e4 LT	408
7ba699c6	409	nla_put_failure:
e329bc42	410	spin_unlock_bh(&police->tcf_lock);
dc5fc579	411	nlmsg_trim(skb, b);
1da177e4 LT	412	return -1;
	413	}
	414
f061b48c	415	static int tcf_police_search(struct net net, struct tc_action *a, u32 index)
ddf97ccd WC	416	{
	417	struct tc_action_net *tn = net_generic(net, police_net_id);
	418
65a206c0	419	return tcf_idr_search(tn, a, index);
ddf97ccd WC	420	}
ddf97ccd WC	421
b50e462b IS	422	static int tcf_police_act_to_flow_act(int tc_act, u32 *extval,
b50e462b IS	423	struct netlink_ext_ack *extack)
b8cd5831 JL	424	{
	425	int act_id = -EOPNOTSUPP;
	426
	427	if (!TC_ACT_EXT_OPCODE(tc_act)) {
	428	if (tc_act == TC_ACT_OK)
	429	act_id = FLOW_ACTION_ACCEPT;
	430	else if (tc_act == TC_ACT_SHOT)
	431	act_id = FLOW_ACTION_DROP;
	432	else if (tc_act == TC_ACT_PIPE)
	433	act_id = FLOW_ACTION_PIPE;
b50e462b IS	434	else if (tc_act == TC_ACT_RECLASSIFY)
	435	NL_SET_ERR_MSG_MOD(extack, "Offload not supported when conform/exceed action is \"reclassify\"");
	436	else
	437	NL_SET_ERR_MSG_MOD(extack, "Unsupported conform/exceed action offload");
b8cd5831 JL	438	} else if (TC_ACT_EXT_CMP(tc_act, TC_ACT_GOTO_CHAIN)) {
	439	act_id = FLOW_ACTION_GOTO;
	440	*extval = tc_act & TC_ACT_EXT_VAL_MASK;
	441	} else if (TC_ACT_EXT_CMP(tc_act, TC_ACT_JUMP)) {
	442	act_id = FLOW_ACTION_JUMP;
	443	*extval = tc_act & TC_ACT_EXT_VAL_MASK;
b50e462b IS	444	} else if (tc_act == TC_ACT_UNSPEC) {
	445	NL_SET_ERR_MSG_MOD(extack, "Offload not supported when conform/exceed action is \"continue\"");
	446	} else {
	447	NL_SET_ERR_MSG_MOD(extack, "Unsupported conform/exceed action offload");
b8cd5831 JL	448	}
	449
	450	return act_id;
	451	}
	452
c54e1d92	453	static int tcf_police_offload_act_setup(struct tc_action act, void entry_data,
c2ccf84e IS	454	u32 *index_inc, bool bind,
c2ccf84e IS	455	struct netlink_ext_ack *extack)
c54e1d92 BZ	456	{
	457	if (bind) {
	458	struct flow_action_entry *entry = entry_data;
b8cd5831 JL	459	struct tcf_police *police = to_police(act);
	460	struct tcf_police_params *p;
	461	int act_id;
	462
	463	p = rcu_dereference_protected(police->params,
	464	lockdep_is_held(&police->tcf_lock));
c54e1d92 BZ	465
	466	entry->id = FLOW_ACTION_POLICE;
	467	entry->police.burst = tcf_police_burst(act);
	468	entry->police.rate_bytes_ps =
	469	tcf_police_rate_bytes_ps(act);
b8cd5831 JL	470	entry->police.peakrate_bytes_ps = tcf_police_peakrate_bytes_ps(act);
	471	entry->police.avrate = tcf_police_tcfp_ewma_rate(act);
	472	entry->police.overhead = tcf_police_rate_overhead(act);
c54e1d92 BZ	473	entry->police.burst_pkt = tcf_police_burst_pkt(act);
	474	entry->police.rate_pkt_ps =
	475	tcf_police_rate_pkt_ps(act);
	476	entry->police.mtu = tcf_police_tcfp_mtu(act);
b8cd5831 JL	477
b8cd5831 JL	478	act_id = tcf_police_act_to_flow_act(police->tcf_action,
b50e462b IS	479	&entry->police.exceed.extval,
b50e462b IS	480	extack);
b8cd5831 JL	481	if (act_id < 0)
	482	return act_id;
	483
	484	entry->police.exceed.act_id = act_id;
	485
	486	act_id = tcf_police_act_to_flow_act(p->tcfp_result,
b50e462b IS	487	&entry->police.notexceed.extval,
b50e462b IS	488	extack);
b8cd5831 JL	489	if (act_id < 0)
	490	return act_id;
	491
	492	entry->police.notexceed.act_id = act_id;
	493
c54e1d92 BZ	494	*index_inc = 1;
c54e1d92 BZ	495	} else {
8cbfe939 BZ	496	struct flow_offload_action *fl_action = entry_data;
	497
	498	fl_action->id = FLOW_ACTION_POLICE;
c54e1d92 BZ	499	}
	500
	501	return 0;
	502	}
	503
1da177e4 LT	504	MODULE_AUTHOR("Alexey Kuznetsov");
	505	MODULE_DESCRIPTION("Policing actions");
	506	MODULE_LICENSE("GPL");
	507
	508	static struct tc_action_ops act_police_ops = {
	509	.kind = "police",
eddd2cf1	510	.id = TCA_ID_POLICE,
1da177e4	511	.owner = THIS_MODULE,
12f02b6b	512	.stats_update = tcf_police_stats_update,
2ac06347 JHS	513	.act = tcf_police_act,
	514	.dump = tcf_police_dump,
	515	.init = tcf_police_init,
	516	.walk = tcf_police_walker,
ddf97ccd	517	.lookup = tcf_police_search,
2d550dba	518	.cleanup = tcf_police_cleanup,
c54e1d92	519	.offload_act_setup = tcf_police_offload_act_setup,
a85a970a	520	.size = sizeof(struct tcf_police),
ddf97ccd WC	521	};
	522
	523	static __net_init int police_init_net(struct net *net)
	524	{
	525	struct tc_action_net *tn = net_generic(net, police_net_id);
	526
981471bd	527	return tc_action_net_init(net, tn, &act_police_ops);
ddf97ccd WC	528	}
ddf97ccd WC	529
039af9c6	530	static void __net_exit police_exit_net(struct list_head *net_list)
ddf97ccd	531	{
039af9c6	532	tc_action_net_exit(net_list, police_net_id);
ddf97ccd WC	533	}
	534
	535	static struct pernet_operations police_net_ops = {
	536	.init = police_init_net,
039af9c6	537	.exit_batch = police_exit_net,
ddf97ccd WC	538	.id = &police_net_id,
ddf97ccd WC	539	.size = sizeof(struct tc_action_net),
1da177e4 LT	540	};
1da177e4 LT	541
5a7a5555	542	static int __init police_init_module(void)
1da177e4	543	{
ddf97ccd	544	return tcf_register_action(&act_police_ops, &police_net_ops);
1da177e4 LT	545	}
1da177e4 LT	546
5a7a5555	547	static void __exit police_cleanup_module(void)
1da177e4	548	{
ddf97ccd	549	tcf_unregister_action(&act_police_ops, &police_net_ops);
1da177e4 LT	550	}
	551
	552	module_init(police_init_module);
	553	module_exit(police_cleanup_module);