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

// SPDX-License-Identifier: GPL-2.0-or-later
/* Copyright 2020 NXP */

#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_gate.h>

static struct tc_action_ops act_gate_ops;

static ktime_t gate_get_time(struct tcf_gate *gact)
{
	ktime_t mono = ktime_get();

	switch (gact->tk_offset) {
	case TK_OFFS_MAX:
		return mono;
	default:
		return ktime_mono_to_any(mono, gact->tk_offset);
	}

	return KTIME_MAX;
}

static void gate_get_start_time(struct tcf_gate *gact, ktime_t *start)
{
	struct tcf_gate_params *param = &gact->param;
	ktime_t now, base, cycle;
	u64 n;

	base = ns_to_ktime(param->tcfg_basetime);
	now = gate_get_time(gact);

	if (ktime_after(base, now)) {
		*start = base;
		return;
	}

	cycle = param->tcfg_cycletime;

	n = div64_u64(ktime_sub_ns(now, base), cycle);
	*start = ktime_add_ns(base, (n + 1) * cycle);
}

static void gate_start_timer(struct tcf_gate *gact, ktime_t start)
{
	ktime_t expires;

	expires = hrtimer_get_expires(&gact->hitimer);
	if (expires == 0)
		expires = KTIME_MAX;

	start = min_t(ktime_t, start, expires);

	hrtimer_start(&gact->hitimer, start, HRTIMER_MODE_ABS_SOFT);
}

static enum hrtimer_restart gate_timer_func(struct hrtimer *timer)
{
	struct tcf_gate *gact = container_of(timer, struct tcf_gate,
					     hitimer);
	struct tcf_gate_params *p = &gact->param;
	struct tcfg_gate_entry *next;
	ktime_t close_time, now;

	spin_lock(&gact->tcf_lock);

	next = gact->next_entry;

	/* cycle start, clear pending bit, clear total octets */
	gact->current_gate_status = next->gate_state ? GATE_ACT_GATE_OPEN : 0;
	gact->current_entry_octets = 0;
	gact->current_max_octets = next->maxoctets;

	gact->current_close_time = ktime_add_ns(gact->current_close_time,
						next->interval);

	close_time = gact->current_close_time;

	if (list_is_last(&next->list, &p->entries))
		next = list_first_entry(&p->entries,
					struct tcfg_gate_entry, list);
	else
		next = list_next_entry(next, list);

	now = gate_get_time(gact);

	if (ktime_after(now, close_time)) {
		ktime_t cycle, base;
		u64 n;

		cycle = p->tcfg_cycletime;
		base = ns_to_ktime(p->tcfg_basetime);
		n = div64_u64(ktime_sub_ns(now, base), cycle);
		close_time = ktime_add_ns(base, (n + 1) * cycle);
	}

	gact->next_entry = next;

	hrtimer_set_expires(&gact->hitimer, close_time);

	spin_unlock(&gact->tcf_lock);

	return HRTIMER_RESTART;
}

static int tcf_gate_act(struct sk_buff *skb, const struct tc_action *a,
			struct tcf_result *res)
{
	struct tcf_gate *gact = to_gate(a);

	spin_lock(&gact->tcf_lock);

	tcf_lastuse_update(&gact->tcf_tm);
	bstats_update(&gact->tcf_bstats, skb);

	if (unlikely(gact->current_gate_status & GATE_ACT_PENDING)) {
		spin_unlock(&gact->tcf_lock);
		return gact->tcf_action;
	}

	if (!(gact->current_gate_status & GATE_ACT_GATE_OPEN))
		goto drop;

	if (gact->current_max_octets >= 0) {
		gact->current_entry_octets += qdisc_pkt_len(skb);
		if (gact->current_entry_octets > gact->current_max_octets) {
			gact->tcf_qstats.overlimits++;
			goto drop;
		}
	}

	spin_unlock(&gact->tcf_lock);

	return gact->tcf_action;
drop:
	gact->tcf_qstats.drops++;
	spin_unlock(&gact->tcf_lock);

	return TC_ACT_SHOT;
}

static const struct nla_policy entry_policy[TCA_GATE_ENTRY_MAX + 1] = {
	[TCA_GATE_ENTRY_INDEX]		= { .type = NLA_U32 },
	[TCA_GATE_ENTRY_GATE]		= { .type = NLA_FLAG },
	[TCA_GATE_ENTRY_INTERVAL]	= { .type = NLA_U32 },
	[TCA_GATE_ENTRY_IPV]		= { .type = NLA_S32 },
	[TCA_GATE_ENTRY_MAX_OCTETS]	= { .type = NLA_S32 },
};

static const struct nla_policy gate_policy[TCA_GATE_MAX + 1] = {
	[TCA_GATE_PARMS]		=
		NLA_POLICY_EXACT_LEN(sizeof(struct tc_gate)),
	[TCA_GATE_PRIORITY]		= { .type = NLA_S32 },
	[TCA_GATE_ENTRY_LIST]		= { .type = NLA_NESTED },
	[TCA_GATE_BASE_TIME]		= { .type = NLA_U64 },
	[TCA_GATE_CYCLE_TIME]		= { .type = NLA_U64 },
	[TCA_GATE_CYCLE_TIME_EXT]	= { .type = NLA_U64 },
	[TCA_GATE_FLAGS]		= { .type = NLA_U32 },
	[TCA_GATE_CLOCKID]		= { .type = NLA_S32 },
};

static int fill_gate_entry(struct nlattr **tb, struct tcfg_gate_entry *entry,
			   struct netlink_ext_ack *extack)
{
	u32 interval = 0;

	entry->gate_state = nla_get_flag(tb[TCA_GATE_ENTRY_GATE]);

	if (tb[TCA_GATE_ENTRY_INTERVAL])
		interval = nla_get_u32(tb[TCA_GATE_ENTRY_INTERVAL]);

	if (interval == 0) {
		NL_SET_ERR_MSG(extack, "Invalid interval for schedule entry");
		return -EINVAL;
	}

	entry->interval = interval;

	if (tb[TCA_GATE_ENTRY_IPV])
		entry->ipv = nla_get_s32(tb[TCA_GATE_ENTRY_IPV]);
	else
		entry->ipv = -1;

	if (tb[TCA_GATE_ENTRY_MAX_OCTETS])
		entry->maxoctets = nla_get_s32(tb[TCA_GATE_ENTRY_MAX_OCTETS]);
	else
		entry->maxoctets = -1;

	return 0;
}

static int parse_gate_entry(struct nlattr *n, struct  tcfg_gate_entry *entry,
			    int index, struct netlink_ext_ack *extack)
{
	struct nlattr *tb[TCA_GATE_ENTRY_MAX + 1] = { };
	int err;

	err = nla_parse_nested(tb, TCA_GATE_ENTRY_MAX, n, entry_policy, extack);
	if (err < 0) {
		NL_SET_ERR_MSG(extack, "Could not parse nested entry");
		return -EINVAL;
	}

	entry->index = index;

	return fill_gate_entry(tb, entry, extack);
}

static void release_entry_list(struct list_head *entries)
{
	struct tcfg_gate_entry *entry, *e;

	list_for_each_entry_safe(entry, e, entries, list) {
		list_del(&entry->list);
		kfree(entry);
	}
}

static int parse_gate_list(struct nlattr *list_attr,
			   struct tcf_gate_params *sched,
			   struct netlink_ext_ack *extack)
{
	struct tcfg_gate_entry *entry;
	struct nlattr *n;
	int err, rem;
	int i = 0;

	if (!list_attr)
		return -EINVAL;

	nla_for_each_nested(n, list_attr, rem) {
		if (nla_type(n) != TCA_GATE_ONE_ENTRY) {
			NL_SET_ERR_MSG(extack, "Attribute isn't type 'entry'");
			continue;
		}

		entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
		if (!entry) {
			NL_SET_ERR_MSG(extack, "Not enough memory for entry");
			err = -ENOMEM;
			goto release_list;
		}

		err = parse_gate_entry(n, entry, i, extack);
		if (err < 0) {
			kfree(entry);
			goto release_list;
		}

		list_add_tail(&entry->list, &sched->entries);
		i++;
	}

	sched->num_entries = i;

	return i;

release_list:
	release_entry_list(&sched->entries);

	return err;
}

static void gate_setup_timer(struct tcf_gate *gact, u64 basetime,
			     enum tk_offsets tko, s32 clockid,
			     bool do_init)
{
	if (!do_init) {
		if (basetime == gact->param.tcfg_basetime &&
		    tko == gact->tk_offset &&
		    clockid == gact->param.tcfg_clockid)
			return;

		spin_unlock_bh(&gact->tcf_lock);
		hrtimer_cancel(&gact->hitimer);
		spin_lock_bh(&gact->tcf_lock);
	}
	gact->param.tcfg_basetime = basetime;
	gact->param.tcfg_clockid = clockid;
	gact->tk_offset = tko;
	hrtimer_init(&gact->hitimer, clockid, HRTIMER_MODE_ABS_SOFT);
	gact->hitimer.function = gate_timer_func;
}

static int tcf_gate_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)
{
	struct tc_action_net *tn = net_generic(net, act_gate_ops.net_id);
	enum tk_offsets tk_offset = TK_OFFS_TAI;
	bool bind = flags & TCA_ACT_FLAGS_BIND;
	struct nlattr *tb[TCA_GATE_MAX + 1];
	struct tcf_chain *goto_ch = NULL;
	u64 cycletime = 0, basetime = 0;
	struct tcf_gate_params *p;
	s32 clockid = CLOCK_TAI;
	struct tcf_gate *gact;
	struct tc_gate *parm;
	int ret = 0, err;
	u32 gflags = 0;
	s32 prio = -1;
	ktime_t start;
	u32 index;

	if (!nla)
		return -EINVAL;

	err = nla_parse_nested(tb, TCA_GATE_MAX, nla, gate_policy, extack);
	if (err < 0)
		return err;

	if (!tb[TCA_GATE_PARMS])
		return -EINVAL;

	if (tb[TCA_GATE_CLOCKID]) {
		clockid = nla_get_s32(tb[TCA_GATE_CLOCKID]);
		switch (clockid) {
		case CLOCK_REALTIME:
			tk_offset = TK_OFFS_REAL;
			break;
		case CLOCK_MONOTONIC:
			tk_offset = TK_OFFS_MAX;
			break;
		case CLOCK_BOOTTIME:
			tk_offset = TK_OFFS_BOOT;
			break;
		case CLOCK_TAI:
			tk_offset = TK_OFFS_TAI;
			break;
		default:
			NL_SET_ERR_MSG(extack, "Invalid 'clockid'");
			return -EINVAL;
		}
	}

	parm = nla_data(tb[TCA_GATE_PARMS]);
	index = parm->index;

	err = tcf_idr_check_alloc(tn, &index, a, bind);
	if (err < 0)
		return err;

	if (err && bind)
		return 0;

	if (!err) {
		ret = tcf_idr_create(tn, index, est, a,
				     &act_gate_ops, bind, false, flags);
		if (ret) {
			tcf_idr_cleanup(tn, index);
			return ret;
		}

		ret = ACT_P_CREATED;
	} else if (!(flags & TCA_ACT_FLAGS_REPLACE)) {
		tcf_idr_release(*a, bind);
		return -EEXIST;
	}

	if (tb[TCA_GATE_PRIORITY])
		prio = nla_get_s32(tb[TCA_GATE_PRIORITY]);

	if (tb[TCA_GATE_BASE_TIME])
		basetime = nla_get_u64(tb[TCA_GATE_BASE_TIME]);

	if (tb[TCA_GATE_FLAGS])
		gflags = nla_get_u32(tb[TCA_GATE_FLAGS]);

	gact = to_gate(*a);
	if (ret == ACT_P_CREATED)
		INIT_LIST_HEAD(&gact->param.entries);

	err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack);
	if (err < 0)
		goto release_idr;

	spin_lock_bh(&gact->tcf_lock);
	p = &gact->param;

	if (tb[TCA_GATE_CYCLE_TIME])
		cycletime = nla_get_u64(tb[TCA_GATE_CYCLE_TIME]);

	if (tb[TCA_GATE_ENTRY_LIST]) {
		err = parse_gate_list(tb[TCA_GATE_ENTRY_LIST], p, extack);
		if (err < 0)
			goto chain_put;
	}

	if (!cycletime) {
		struct tcfg_gate_entry *entry;
		ktime_t cycle = 0;

		list_for_each_entry(entry, &p->entries, list)
			cycle = ktime_add_ns(cycle, entry->interval);
		cycletime = cycle;
		if (!cycletime) {
			err = -EINVAL;
			goto chain_put;
		}
	}
	p->tcfg_cycletime = cycletime;

	if (tb[TCA_GATE_CYCLE_TIME_EXT])
		p->tcfg_cycletime_ext =
			nla_get_u64(tb[TCA_GATE_CYCLE_TIME_EXT]);

	gate_setup_timer(gact, basetime, tk_offset, clockid,
			 ret == ACT_P_CREATED);
	p->tcfg_priority = prio;
	p->tcfg_flags = gflags;
	gate_get_start_time(gact, &start);

	gact->current_close_time = start;
	gact->current_gate_status = GATE_ACT_GATE_OPEN | GATE_ACT_PENDING;

	gact->next_entry = list_first_entry(&p->entries,
					    struct tcfg_gate_entry, list);

	goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);

	gate_start_timer(gact, start);

	spin_unlock_bh(&gact->tcf_lock);

	if (goto_ch)
		tcf_chain_put_by_act(goto_ch);

	return ret;

chain_put:
	spin_unlock_bh(&gact->tcf_lock);

	if (goto_ch)
		tcf_chain_put_by_act(goto_ch);
release_idr:
	/* action is not inserted in any list: it's safe to init hitimer
	 * without taking tcf_lock.
	 */
	if (ret == ACT_P_CREATED)
		gate_setup_timer(gact, gact->param.tcfg_basetime,
				 gact->tk_offset, gact->param.tcfg_clockid,
				 true);
	tcf_idr_release(*a, bind);
	return err;
}

static void tcf_gate_cleanup(struct tc_action *a)
{
	struct tcf_gate *gact = to_gate(a);
	struct tcf_gate_params *p;

	p = &gact->param;
	hrtimer_cancel(&gact->hitimer);
	release_entry_list(&p->entries);
}

static int dumping_entry(struct sk_buff *skb,
			 struct tcfg_gate_entry *entry)
{
	struct nlattr *item;

	item = nla_nest_start_noflag(skb, TCA_GATE_ONE_ENTRY);
	if (!item)
		return -ENOSPC;

	if (nla_put_u32(skb, TCA_GATE_ENTRY_INDEX, entry->index))
		goto nla_put_failure;

	if (entry->gate_state && nla_put_flag(skb, TCA_GATE_ENTRY_GATE))
		goto nla_put_failure;

	if (nla_put_u32(skb, TCA_GATE_ENTRY_INTERVAL, entry->interval))
		goto nla_put_failure;

	if (nla_put_s32(skb, TCA_GATE_ENTRY_MAX_OCTETS, entry->maxoctets))
		goto nla_put_failure;

	if (nla_put_s32(skb, TCA_GATE_ENTRY_IPV, entry->ipv))
		goto nla_put_failure;

	return nla_nest_end(skb, item);

nla_put_failure:
	nla_nest_cancel(skb, item);
	return -1;
}

static int tcf_gate_dump(struct sk_buff *skb, struct tc_action *a,
			 int bind, int ref)
{
	unsigned char *b = skb_tail_pointer(skb);
	struct tcf_gate *gact = to_gate(a);
	struct tc_gate opt = {
		.index    = gact->tcf_index,
		.refcnt   = refcount_read(&gact->tcf_refcnt) - ref,
		.bindcnt  = atomic_read(&gact->tcf_bindcnt) - bind,
	};
	struct tcfg_gate_entry *entry;
	struct tcf_gate_params *p;
	struct nlattr *entry_list;
	struct tcf_t t;

	spin_lock_bh(&gact->tcf_lock);
	opt.action = gact->tcf_action;

	p = &gact->param;

	if (nla_put(skb, TCA_GATE_PARMS, sizeof(opt), &opt))
		goto nla_put_failure;

	if (nla_put_u64_64bit(skb, TCA_GATE_BASE_TIME,
			      p->tcfg_basetime, TCA_GATE_PAD))
		goto nla_put_failure;

	if (nla_put_u64_64bit(skb, TCA_GATE_CYCLE_TIME,
			      p->tcfg_cycletime, TCA_GATE_PAD))
		goto nla_put_failure;

	if (nla_put_u64_64bit(skb, TCA_GATE_CYCLE_TIME_EXT,
			      p->tcfg_cycletime_ext, TCA_GATE_PAD))
		goto nla_put_failure;

	if (nla_put_s32(skb, TCA_GATE_CLOCKID, p->tcfg_clockid))
		goto nla_put_failure;

	if (nla_put_u32(skb, TCA_GATE_FLAGS, p->tcfg_flags))
		goto nla_put_failure;

	if (nla_put_s32(skb, TCA_GATE_PRIORITY, p->tcfg_priority))
		goto nla_put_failure;

	entry_list = nla_nest_start_noflag(skb, TCA_GATE_ENTRY_LIST);
	if (!entry_list)
		goto nla_put_failure;

	list_for_each_entry(entry, &p->entries, list) {
		if (dumping_entry(skb, entry) < 0)
			goto nla_put_failure;
	}

	nla_nest_end(skb, entry_list);

	tcf_tm_dump(&t, &gact->tcf_tm);
	if (nla_put_64bit(skb, TCA_GATE_TM, sizeof(t), &t, TCA_GATE_PAD))
		goto nla_put_failure;
	spin_unlock_bh(&gact->tcf_lock);

	return skb->len;

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

static void tcf_gate_stats_update(struct tc_action *a, u64 bytes, u64 packets,
				  u64 drops, u64 lastuse, bool hw)
{
	struct tcf_gate *gact = to_gate(a);
	struct tcf_t *tm = &gact->tcf_tm;

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

static size_t tcf_gate_get_fill_size(const struct tc_action *act)
{
	return nla_total_size(sizeof(struct tc_gate));
}

static void tcf_gate_entry_destructor(void *priv)
{
	struct action_gate_entry *oe = priv;

	kfree(oe);
}

static int tcf_gate_get_entries(struct flow_action_entry *entry,
				const struct tc_action *act)
{
	entry->gate.entries = tcf_gate_get_list(act);

	if (!entry->gate.entries)
		return -EINVAL;

	entry->destructor = tcf_gate_entry_destructor;
	entry->destructor_priv = entry->gate.entries;

	return 0;
}

static int tcf_gate_offload_act_setup(struct tc_action *act, void *entry_data,
				      u32 *index_inc, bool bind,
				      struct netlink_ext_ack *extack)
{
	int err;

	if (bind) {
		struct flow_action_entry *entry = entry_data;

		entry->id = FLOW_ACTION_GATE;
		entry->gate.prio = tcf_gate_prio(act);
		entry->gate.basetime = tcf_gate_basetime(act);
		entry->gate.cycletime = tcf_gate_cycletime(act);
		entry->gate.cycletimeext = tcf_gate_cycletimeext(act);
		entry->gate.num_entries = tcf_gate_num_entries(act);
		err = tcf_gate_get_entries(entry, act);
		if (err)
			return err;
		*index_inc = 1;
	} else {
		struct flow_offload_action *fl_action = entry_data;

		fl_action->id = FLOW_ACTION_GATE;
	}

	return 0;
}

static struct tc_action_ops act_gate_ops = {
	.kind		=	"gate",
	.id		=	TCA_ID_GATE,
	.owner		=	THIS_MODULE,
	.act		=	tcf_gate_act,
	.dump		=	tcf_gate_dump,
	.init		=	tcf_gate_init,
	.cleanup	=	tcf_gate_cleanup,
	.stats_update	=	tcf_gate_stats_update,
	.get_fill_size	=	tcf_gate_get_fill_size,
	.offload_act_setup =	tcf_gate_offload_act_setup,
	.size		=	sizeof(struct tcf_gate),
};

static __net_init int gate_init_net(struct net *net)
{
	struct tc_action_net *tn = net_generic(net, act_gate_ops.net_id);

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

static void __net_exit gate_exit_net(struct list_head *net_list)
{
	tc_action_net_exit(net_list, act_gate_ops.net_id);
}

static struct pernet_operations gate_net_ops = {
	.init = gate_init_net,
	.exit_batch = gate_exit_net,
	.id   = &act_gate_ops.net_id,
	.size = sizeof(struct tc_action_net),
};

static int __init gate_init_module(void)
{
	return tcf_register_action(&act_gate_ops, &gate_net_ops);
}

static void __exit gate_cleanup_module(void)
{
	tcf_unregister_action(&act_gate_ops, &gate_net_ops);
}

module_init(gate_init_module);
module_exit(gate_cleanup_module);
MODULE_LICENSE("GPL v2");
Commit	Line	Data
a51c328d PL	1	// SPDX-License-Identifier: GPL-2.0-or-later
	2	/* Copyright 2020 NXP */
	3
	4	#include <linux/module.h>
	5	#include <linux/types.h>
	6	#include <linux/kernel.h>
	7	#include <linux/string.h>
	8	#include <linux/errno.h>
	9	#include <linux/skbuff.h>
	10	#include <linux/rtnetlink.h>
	11	#include <linux/init.h>
	12	#include <linux/slab.h>
	13	#include <net/act_api.h>
	14	#include <net/netlink.h>
	15	#include <net/pkt_cls.h>
	16	#include <net/tc_act/tc_gate.h>
	17
a51c328d PL	18	static struct tc_action_ops act_gate_ops;
	19
	20	static ktime_t gate_get_time(struct tcf_gate *gact)
	21	{
	22	ktime_t mono = ktime_get();
	23
	24	switch (gact->tk_offset) {
	25	case TK_OFFS_MAX:
	26	return mono;
	27	default:
	28	return ktime_mono_to_any(mono, gact->tk_offset);
	29	}
	30
	31	return KTIME_MAX;
	32	}
	33
7024339a	34	static void gate_get_start_time(struct tcf_gate gact, ktime_t start)
a51c328d PL	35	{
	36	struct tcf_gate_params *param = &gact->param;
	37	ktime_t now, base, cycle;
	38	u64 n;
	39
	40	base = ns_to_ktime(param->tcfg_basetime);
	41	now = gate_get_time(gact);
	42
	43	if (ktime_after(base, now)) {
	44	*start = base;
7024339a	45	return;
a51c328d PL	46	}
	47
	48	cycle = param->tcfg_cycletime;
	49
a51c328d PL	50	n = div64_u64(ktime_sub_ns(now, base), cycle);
a51c328d PL	51	start = ktime_add_ns(base, (n + 1) cycle);
a51c328d PL	52	}
	53
	54	static void gate_start_timer(struct tcf_gate *gact, ktime_t start)
	55	{
	56	ktime_t expires;
	57
	58	expires = hrtimer_get_expires(&gact->hitimer);
	59	if (expires == 0)
	60	expires = KTIME_MAX;
	61
	62	start = min_t(ktime_t, start, expires);
	63
	64	hrtimer_start(&gact->hitimer, start, HRTIMER_MODE_ABS_SOFT);
	65	}
	66
	67	static enum hrtimer_restart gate_timer_func(struct hrtimer *timer)
	68	{
	69	struct tcf_gate *gact = container_of(timer, struct tcf_gate,
	70	hitimer);
	71	struct tcf_gate_params *p = &gact->param;
	72	struct tcfg_gate_entry *next;
	73	ktime_t close_time, now;
	74
	75	spin_lock(&gact->tcf_lock);
	76
	77	next = gact->next_entry;
	78
	79	/* cycle start, clear pending bit, clear total octets */
	80	gact->current_gate_status = next->gate_state ? GATE_ACT_GATE_OPEN : 0;
	81	gact->current_entry_octets = 0;
	82	gact->current_max_octets = next->maxoctets;
	83
	84	gact->current_close_time = ktime_add_ns(gact->current_close_time,
	85	next->interval);
	86
	87	close_time = gact->current_close_time;
	88
	89	if (list_is_last(&next->list, &p->entries))
	90	next = list_first_entry(&p->entries,
	91	struct tcfg_gate_entry, list);
	92	else
	93	next = list_next_entry(next, list);
	94
	95	now = gate_get_time(gact);
	96
	97	if (ktime_after(now, close_time)) {
	98	ktime_t cycle, base;
	99	u64 n;
	100
	101	cycle = p->tcfg_cycletime;
	102	base = ns_to_ktime(p->tcfg_basetime);
	103	n = div64_u64(ktime_sub_ns(now, base), cycle);
	104	close_time = ktime_add_ns(base, (n + 1) * cycle);
	105	}
	106
	107	gact->next_entry = next;
	108
	109	hrtimer_set_expires(&gact->hitimer, close_time);
	110
	111	spin_unlock(&gact->tcf_lock);
	112
	113	return HRTIMER_RESTART;
	114	}
	115
116	static int tcf_gate_act(struct sk_buff skb, const struct tc_action a,
117	struct tcf_result *res)
118	{
119	struct tcf_gate *gact = to_gate(a);
120
121	spin_lock(&gact->tcf_lock);
122
123	tcf_lastuse_update(&gact->tcf_tm);
124	bstats_update(&gact->tcf_bstats, skb);
125
126	if (unlikely(gact->current_gate_status & GATE_ACT_PENDING)) {
127	spin_unlock(&gact->tcf_lock);
128	return gact->tcf_action;
129	}
130
131	if (!(gact->current_gate_status & GATE_ACT_GATE_OPEN))
132	goto drop;
133
134	if (gact->current_max_octets >= 0) {
135	gact->current_entry_octets += qdisc_pkt_len(skb);
136	if (gact->current_entry_octets > gact->current_max_octets) {
137	gact->tcf_qstats.overlimits++;
138	goto drop;
139	}
140	}
141
142	spin_unlock(&gact->tcf_lock);
143
144	return gact->tcf_action;
145	drop:
146	gact->tcf_qstats.drops++;
147	spin_unlock(&gact->tcf_lock);
148
149	return TC_ACT_SHOT;
150	}
151
152	static const struct nla_policy entry_policy[TCA_GATE_ENTRY_MAX + 1] = {
153	[TCA_GATE_ENTRY_INDEX] = { .type = NLA_U32 },
154	[TCA_GATE_ENTRY_GATE] = { .type = NLA_FLAG },
155	[TCA_GATE_ENTRY_INTERVAL] = { .type = NLA_U32 },
156	[TCA_GATE_ENTRY_IPV] = { .type = NLA_S32 },
157	[TCA_GATE_ENTRY_MAX_OCTETS] = { .type = NLA_S32 },
158	};
159
160	static const struct nla_policy gate_policy[TCA_GATE_MAX + 1] = {
8140860c JB	161	[TCA_GATE_PARMS] =
8140860c JB	162	NLA_POLICY_EXACT_LEN(sizeof(struct tc_gate)),
a51c328d PL	163	[TCA_GATE_PRIORITY] = { .type = NLA_S32 },
	164	[TCA_GATE_ENTRY_LIST] = { .type = NLA_NESTED },
	165	[TCA_GATE_BASE_TIME] = { .type = NLA_U64 },
	166	[TCA_GATE_CYCLE_TIME] = { .type = NLA_U64 },
	167	[TCA_GATE_CYCLE_TIME_EXT] = { .type = NLA_U64 },
	168	[TCA_GATE_FLAGS] = { .type = NLA_U32 },
	169	[TCA_GATE_CLOCKID] = { .type = NLA_S32 },
	170	};
	171
	172	static int fill_gate_entry(struct nlattr *tb, struct tcfg_gate_entry entry,
	173	struct netlink_ext_ack *extack)
	174	{
	175	u32 interval = 0;
	176
	177	entry->gate_state = nla_get_flag(tb[TCA_GATE_ENTRY_GATE]);
	178
	179	if (tb[TCA_GATE_ENTRY_INTERVAL])
	180	interval = nla_get_u32(tb[TCA_GATE_ENTRY_INTERVAL]);
	181
	182	if (interval == 0) {
	183	NL_SET_ERR_MSG(extack, "Invalid interval for schedule entry");
	184	return -EINVAL;
	185	}
	186
	187	entry->interval = interval;
	188
	189	if (tb[TCA_GATE_ENTRY_IPV])
	190	entry->ipv = nla_get_s32(tb[TCA_GATE_ENTRY_IPV]);
	191	else
	192	entry->ipv = -1;
	193
	194	if (tb[TCA_GATE_ENTRY_MAX_OCTETS])
	195	entry->maxoctets = nla_get_s32(tb[TCA_GATE_ENTRY_MAX_OCTETS]);
	196	else
	197	entry->maxoctets = -1;
	198
	199	return 0;
	200	}
	201
	202	static int parse_gate_entry(struct nlattr n, struct tcfg_gate_entry entry,
	203	int index, struct netlink_ext_ack *extack)
	204	{
	205	struct nlattr *tb[TCA_GATE_ENTRY_MAX + 1] = { };
	206	int err;
	207
	208	err = nla_parse_nested(tb, TCA_GATE_ENTRY_MAX, n, entry_policy, extack);
	209	if (err < 0) {
	210	NL_SET_ERR_MSG(extack, "Could not parse nested entry");
	211	return -EINVAL;
	212	}
	213
	214	entry->index = index;
	215
	216	return fill_gate_entry(tb, entry, extack);
	217	}
	218
	219	static void release_entry_list(struct list_head *entries)
	220	{
	221	struct tcfg_gate_entry entry, e;
	222
	223	list_for_each_entry_safe(entry, e, entries, list) {
	224	list_del(&entry->list);
	225	kfree(entry);
	226	}
227	}
228
229	static int parse_gate_list(struct nlattr *list_attr,
230	struct tcf_gate_params *sched,
231	struct netlink_ext_ack *extack)
232	{
233	struct tcfg_gate_entry *entry;
234	struct nlattr *n;
235	int err, rem;
236	int i = 0;
237
238	if (!list_attr)
239	return -EINVAL;
240
241	nla_for_each_nested(n, list_attr, rem) {
242	if (nla_type(n) != TCA_GATE_ONE_ENTRY) {
243	NL_SET_ERR_MSG(extack, "Attribute isn't type 'entry'");
244	continue;
245	}
246
247	entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
248	if (!entry) {
249	NL_SET_ERR_MSG(extack, "Not enough memory for entry");
250	err = -ENOMEM;
251	goto release_list;
252	}
253
254	err = parse_gate_entry(n, entry, i, extack);
255	if (err < 0) {
256	kfree(entry);
257	goto release_list;
258	}
259
260	list_add_tail(&entry->list, &sched->entries);
261	i++;
262	}
263
264	sched->num_entries = i;
265
266	return i;
267
268	release_list:
269	release_entry_list(&sched->entries);
270
271	return err;
272	}
273
c362a06e DC	274	static void gate_setup_timer(struct tcf_gate *gact, u64 basetime,
	275	enum tk_offsets tko, s32 clockid,
	276	bool do_init)
	277	{
	278	if (!do_init) {
	279	if (basetime == gact->param.tcfg_basetime &&
	280	tko == gact->tk_offset &&
	281	clockid == gact->param.tcfg_clockid)
	282	return;
	283
	284	spin_unlock_bh(&gact->tcf_lock);
	285	hrtimer_cancel(&gact->hitimer);
	286	spin_lock_bh(&gact->tcf_lock);
	287	}
	288	gact->param.tcfg_basetime = basetime;
	289	gact->param.tcfg_clockid = clockid;
	290	gact->tk_offset = tko;
	291	hrtimer_init(&gact->hitimer, clockid, HRTIMER_MODE_ABS_SOFT);
	292	gact->hitimer.function = gate_timer_func;
	293	}
	294
a51c328d PL	295	static int tcf_gate_init(struct net net, struct nlattr nla,
a51c328d PL	296	struct nlattr est, struct tc_action *a,
a51c328d PL	297	struct tcf_proto *tp, u32 flags,
	298	struct netlink_ext_ack *extack)
	299	{
acd0a7ab	300	struct tc_action_net *tn = net_generic(net, act_gate_ops.net_id);
a51c328d	301	enum tk_offsets tk_offset = TK_OFFS_TAI;
695176bf	302	bool bind = flags & TCA_ACT_FLAGS_BIND;
a51c328d PL	303	struct nlattr *tb[TCA_GATE_MAX + 1];
a51c328d PL	304	struct tcf_chain *goto_ch = NULL;
7024339a	305	u64 cycletime = 0, basetime = 0;
a51c328d PL	306	struct tcf_gate_params *p;
	307	s32 clockid = CLOCK_TAI;
	308	struct tcf_gate *gact;
	309	struct tc_gate *parm;
	310	int ret = 0, err;
a51c328d PL	311	u32 gflags = 0;
	312	s32 prio = -1;
	313	ktime_t start;
	314	u32 index;
	315
	316	if (!nla)
	317	return -EINVAL;
	318
	319	err = nla_parse_nested(tb, TCA_GATE_MAX, nla, gate_policy, extack);
	320	if (err < 0)
	321	return err;
	322
	323	if (!tb[TCA_GATE_PARMS])
	324	return -EINVAL;
	325
c362a06e DC	326	if (tb[TCA_GATE_CLOCKID]) {
	327	clockid = nla_get_s32(tb[TCA_GATE_CLOCKID]);
	328	switch (clockid) {
	329	case CLOCK_REALTIME:
	330	tk_offset = TK_OFFS_REAL;
	331	break;
	332	case CLOCK_MONOTONIC:
	333	tk_offset = TK_OFFS_MAX;
	334	break;
	335	case CLOCK_BOOTTIME:
	336	tk_offset = TK_OFFS_BOOT;
	337	break;
	338	case CLOCK_TAI:
	339	tk_offset = TK_OFFS_TAI;
	340	break;
	341	default:
	342	NL_SET_ERR_MSG(extack, "Invalid 'clockid'");
	343	return -EINVAL;
	344	}
	345	}
	346
a51c328d PL	347	parm = nla_data(tb[TCA_GATE_PARMS]);
	348	index = parm->index;
	349
	350	err = tcf_idr_check_alloc(tn, &index, a, bind);
	351	if (err < 0)
	352	return err;
	353
	354	if (err && bind)
	355	return 0;
	356
	357	if (!err) {
	358	ret = tcf_idr_create(tn, index, est, a,
40bd094d	359	&act_gate_ops, bind, false, flags);
a51c328d PL	360	if (ret) {
	361	tcf_idr_cleanup(tn, index);
	362	return ret;
	363	}
	364
	365	ret = ACT_P_CREATED;
695176bf	366	} else if (!(flags & TCA_ACT_FLAGS_REPLACE)) {
a51c328d PL	367	tcf_idr_release(*a, bind);
	368	return -EEXIST;
	369	}
	370
	371	if (tb[TCA_GATE_PRIORITY])
	372	prio = nla_get_s32(tb[TCA_GATE_PRIORITY]);
	373
	374	if (tb[TCA_GATE_BASE_TIME])
	375	basetime = nla_get_u64(tb[TCA_GATE_BASE_TIME]);
	376
	377	if (tb[TCA_GATE_FLAGS])
	378	gflags = nla_get_u32(tb[TCA_GATE_FLAGS]);
	379
c362a06e DC	380	gact = to_gate(*a);
	381	if (ret == ACT_P_CREATED)
	382	INIT_LIST_HEAD(&gact->param.entries);
a51c328d PL	383
	384	err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack);
	385	if (err < 0)
	386	goto release_idr;
	387
a51c328d PL	388	spin_lock_bh(&gact->tcf_lock);
	389	p = &gact->param;
	390
7024339a DC	391	if (tb[TCA_GATE_CYCLE_TIME])
7024339a DC	392	cycletime = nla_get_u64(tb[TCA_GATE_CYCLE_TIME]);
a51c328d	393
a51c328d PL	394	if (tb[TCA_GATE_ENTRY_LIST]) {
	395	err = parse_gate_list(tb[TCA_GATE_ENTRY_LIST], p, extack);
	396	if (err < 0)
	397	goto chain_put;
	398	}
	399
7024339a	400	if (!cycletime) {
a51c328d PL	401	struct tcfg_gate_entry *entry;
	402	ktime_t cycle = 0;
	403
	404	list_for_each_entry(entry, &p->entries, list)
	405	cycle = ktime_add_ns(cycle, entry->interval);
7024339a DC	406	cycletime = cycle;
	407	if (!cycletime) {
	408	err = -EINVAL;
	409	goto chain_put;
	410	}
a51c328d	411	}
7024339a	412	p->tcfg_cycletime = cycletime;
a51c328d PL	413
	414	if (tb[TCA_GATE_CYCLE_TIME_EXT])
	415	p->tcfg_cycletime_ext =
	416	nla_get_u64(tb[TCA_GATE_CYCLE_TIME_EXT]);
	417
c362a06e DC	418	gate_setup_timer(gact, basetime, tk_offset, clockid,
c362a06e DC	419	ret == ACT_P_CREATED);
a51c328d	420	p->tcfg_priority = prio;
a51c328d	421	p->tcfg_flags = gflags;
7024339a	422	gate_get_start_time(gact, &start);
a51c328d PL	423
	424	gact->current_close_time = start;
	425	gact->current_gate_status = GATE_ACT_GATE_OPEN \| GATE_ACT_PENDING;
	426
	427	gact->next_entry = list_first_entry(&p->entries,
	428	struct tcfg_gate_entry, list);
	429
	430	goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
	431
	432	gate_start_timer(gact, start);
	433
	434	spin_unlock_bh(&gact->tcf_lock);
	435
	436	if (goto_ch)
	437	tcf_chain_put_by_act(goto_ch);
	438
a51c328d PL	439	return ret;
	440
	441	chain_put:
	442	spin_unlock_bh(&gact->tcf_lock);
	443
	444	if (goto_ch)
	445	tcf_chain_put_by_act(goto_ch);
	446	release_idr:
c362a06e DC	447	/* action is not inserted in any list: it's safe to init hitimer
	448	* without taking tcf_lock.
	449	*/
	450	if (ret == ACT_P_CREATED)
	451	gate_setup_timer(gact, gact->param.tcfg_basetime,
	452	gact->tk_offset, gact->param.tcfg_clockid,
	453	true);
a51c328d PL	454	tcf_idr_release(*a, bind);
	455	return err;
	456	}
	457
	458	static void tcf_gate_cleanup(struct tc_action *a)
	459	{
	460	struct tcf_gate *gact = to_gate(a);
	461	struct tcf_gate_params *p;
	462
a51c328d	463	p = &gact->param;
c362a06e	464	hrtimer_cancel(&gact->hitimer);
a51c328d PL	465	release_entry_list(&p->entries);
	466	}
	467
	468	static int dumping_entry(struct sk_buff *skb,
	469	struct tcfg_gate_entry *entry)
	470	{
	471	struct nlattr *item;
	472
	473	item = nla_nest_start_noflag(skb, TCA_GATE_ONE_ENTRY);
	474	if (!item)
	475	return -ENOSPC;
	476
	477	if (nla_put_u32(skb, TCA_GATE_ENTRY_INDEX, entry->index))
	478	goto nla_put_failure;
	479
	480	if (entry->gate_state && nla_put_flag(skb, TCA_GATE_ENTRY_GATE))
	481	goto nla_put_failure;
	482
	483	if (nla_put_u32(skb, TCA_GATE_ENTRY_INTERVAL, entry->interval))
	484	goto nla_put_failure;
	485
	486	if (nla_put_s32(skb, TCA_GATE_ENTRY_MAX_OCTETS, entry->maxoctets))
	487	goto nla_put_failure;
	488
	489	if (nla_put_s32(skb, TCA_GATE_ENTRY_IPV, entry->ipv))
	490	goto nla_put_failure;
	491
	492	return nla_nest_end(skb, item);
	493
	494	nla_put_failure:
	495	nla_nest_cancel(skb, item);
	496	return -1;
	497	}
	498
	499	static int tcf_gate_dump(struct sk_buff skb, struct tc_action a,
	500	int bind, int ref)
	501	{
	502	unsigned char *b = skb_tail_pointer(skb);
	503	struct tcf_gate *gact = to_gate(a);
	504	struct tc_gate opt = {
	505	.index = gact->tcf_index,
	506	.refcnt = refcount_read(&gact->tcf_refcnt) - ref,
	507	.bindcnt = atomic_read(&gact->tcf_bindcnt) - bind,
	508	};
	509	struct tcfg_gate_entry *entry;
	510	struct tcf_gate_params *p;
	511	struct nlattr *entry_list;
	512	struct tcf_t t;
	513
	514	spin_lock_bh(&gact->tcf_lock);
	515	opt.action = gact->tcf_action;
	516
	517	p = &gact->param;
	518
	519	if (nla_put(skb, TCA_GATE_PARMS, sizeof(opt), &opt))
	520	goto nla_put_failure;
	521
	522	if (nla_put_u64_64bit(skb, TCA_GATE_BASE_TIME,
	523	p->tcfg_basetime, TCA_GATE_PAD))
	524	goto nla_put_failure;
	525
	526	if (nla_put_u64_64bit(skb, TCA_GATE_CYCLE_TIME,
	527	p->tcfg_cycletime, TCA_GATE_PAD))
	528	goto nla_put_failure;
529
530	if (nla_put_u64_64bit(skb, TCA_GATE_CYCLE_TIME_EXT,
531	p->tcfg_cycletime_ext, TCA_GATE_PAD))
532	goto nla_put_failure;
533
534	if (nla_put_s32(skb, TCA_GATE_CLOCKID, p->tcfg_clockid))
535	goto nla_put_failure;
536
537	if (nla_put_u32(skb, TCA_GATE_FLAGS, p->tcfg_flags))
538	goto nla_put_failure;
539
540	if (nla_put_s32(skb, TCA_GATE_PRIORITY, p->tcfg_priority))
541	goto nla_put_failure;
542
543	entry_list = nla_nest_start_noflag(skb, TCA_GATE_ENTRY_LIST);
544	if (!entry_list)
545	goto nla_put_failure;
546
547	list_for_each_entry(entry, &p->entries, list) {
548	if (dumping_entry(skb, entry) < 0)
549	goto nla_put_failure;
550	}
551
552	nla_nest_end(skb, entry_list);
553
554	tcf_tm_dump(&t, &gact->tcf_tm);
555	if (nla_put_64bit(skb, TCA_GATE_TM, sizeof(t), &t, TCA_GATE_PAD))
556	goto nla_put_failure;
557	spin_unlock_bh(&gact->tcf_lock);
558
559	return skb->len;
560
561	nla_put_failure:
562	spin_unlock_bh(&gact->tcf_lock);
563	nlmsg_trim(skb, b);
564	return -1;
565	}
566
4b61d3e8 PL	567	static void tcf_gate_stats_update(struct tc_action *a, u64 bytes, u64 packets,
4b61d3e8 PL	568	u64 drops, u64 lastuse, bool hw)
a51c328d PL	569	{
	570	struct tcf_gate *gact = to_gate(a);
	571	struct tcf_t *tm = &gact->tcf_tm;
	572
4b61d3e8	573	tcf_action_update_stats(a, bytes, packets, drops, hw);
a51c328d PL	574	tm->lastuse = max_t(u64, tm->lastuse, lastuse);
	575	}
	576
a51c328d PL	577	static size_t tcf_gate_get_fill_size(const struct tc_action *act)
	578	{
	579	return nla_total_size(sizeof(struct tc_gate));
	580	}
	581
c54e1d92 BZ	582	static void tcf_gate_entry_destructor(void *priv)
	583	{
	584	struct action_gate_entry *oe = priv;
	585
	586	kfree(oe);
	587	}
	588
	589	static int tcf_gate_get_entries(struct flow_action_entry *entry,
	590	const struct tc_action *act)
	591	{
	592	entry->gate.entries = tcf_gate_get_list(act);
	593
	594	if (!entry->gate.entries)
	595	return -EINVAL;
	596
	597	entry->destructor = tcf_gate_entry_destructor;
	598	entry->destructor_priv = entry->gate.entries;
	599
	600	return 0;
	601	}
	602
	603	static int tcf_gate_offload_act_setup(struct tc_action act, void entry_data,
c2ccf84e IS	604	u32 *index_inc, bool bind,
c2ccf84e IS	605	struct netlink_ext_ack *extack)
c54e1d92 BZ	606	{
	607	int err;
	608
	609	if (bind) {
	610	struct flow_action_entry *entry = entry_data;
	611
	612	entry->id = FLOW_ACTION_GATE;
	613	entry->gate.prio = tcf_gate_prio(act);
	614	entry->gate.basetime = tcf_gate_basetime(act);
	615	entry->gate.cycletime = tcf_gate_cycletime(act);
	616	entry->gate.cycletimeext = tcf_gate_cycletimeext(act);
	617	entry->gate.num_entries = tcf_gate_num_entries(act);
	618	err = tcf_gate_get_entries(entry, act);
	619	if (err)
	620	return err;
	621	*index_inc = 1;
	622	} else {
8cbfe939 BZ	623	struct flow_offload_action *fl_action = entry_data;
	624
	625	fl_action->id = FLOW_ACTION_GATE;
c54e1d92 BZ	626	}
	627
	628	return 0;
	629	}
	630
a51c328d PL	631	static struct tc_action_ops act_gate_ops = {
	632	.kind = "gate",
	633	.id = TCA_ID_GATE,
	634	.owner = THIS_MODULE,
	635	.act = tcf_gate_act,
	636	.dump = tcf_gate_dump,
	637	.init = tcf_gate_init,
	638	.cleanup = tcf_gate_cleanup,
a51c328d PL	639	.stats_update = tcf_gate_stats_update,
a51c328d PL	640	.get_fill_size = tcf_gate_get_fill_size,
c54e1d92	641	.offload_act_setup = tcf_gate_offload_act_setup,
a51c328d PL	642	.size = sizeof(struct tcf_gate),
	643	};
	644
	645	static __net_init int gate_init_net(struct net *net)
	646	{
acd0a7ab	647	struct tc_action_net *tn = net_generic(net, act_gate_ops.net_id);
a51c328d PL	648
	649	return tc_action_net_init(net, tn, &act_gate_ops);
	650	}
	651
	652	static void __net_exit gate_exit_net(struct list_head *net_list)
	653	{
acd0a7ab	654	tc_action_net_exit(net_list, act_gate_ops.net_id);
a51c328d PL	655	}
	656
	657	static struct pernet_operations gate_net_ops = {
	658	.init = gate_init_net,
	659	.exit_batch = gate_exit_net,
acd0a7ab	660	.id = &act_gate_ops.net_id,
a51c328d PL	661	.size = sizeof(struct tc_action_net),
	662	};
	663
	664	static int __init gate_init_module(void)
	665	{
	666	return tcf_register_action(&act_gate_ops, &gate_net_ops);
	667	}
	668
	669	static void __exit gate_cleanup_module(void)
	670	{
	671	tcf_unregister_action(&act_gate_ops, &gate_net_ops);
	672	}
	673
	674	module_init(gate_init_module);
	675	module_exit(gate_cleanup_module);
	676	MODULE_LICENSE("GPL v2");