1/*
  2 * net/sched/act_gact.c		Generic actions
  3 *
  4 *		This program is free software; you can redistribute it and/or
  5 *		modify it under the terms of the GNU General Public License
  6 *		as published by the Free Software Foundation; either version
  7 *		2 of the License, or (at your option) any later version.
  8 *
  9 * copyright 	Jamal Hadi Salim (2002-4)
 10 *
 11 */
 12
 13#include <linux/types.h>
 14#include <linux/kernel.h>
 15#include <linux/string.h>
 16#include <linux/errno.h>
 17#include <linux/skbuff.h>
 18#include <linux/rtnetlink.h>
 19#include <linux/module.h>
 20#include <linux/init.h>
 21#include <net/netlink.h>
 22#include <net/pkt_sched.h>
 
 23#include <linux/tc_act/tc_gact.h>
 24#include <net/tc_act/tc_gact.h>
 25
 26static unsigned int gact_net_id;
 27static struct tc_action_ops act_gact_ops;
 28
 29#ifdef CONFIG_GACT_PROB
 30static int gact_net_rand(struct tcf_gact *gact)
 31{
 32	smp_rmb(); /* coupled with smp_wmb() in tcf_gact_init() */
 33	if (prandom_u32() % gact->tcfg_pval)
 34		return gact->tcf_action;
 35	return gact->tcfg_paction;
 36}
 37
 38static int gact_determ(struct tcf_gact *gact)
 39{
 40	u32 pack = atomic_inc_return(&gact->packets);
 41
 42	smp_rmb(); /* coupled with smp_wmb() in tcf_gact_init() */
 43	if (pack % gact->tcfg_pval)
 44		return gact->tcf_action;
 45	return gact->tcfg_paction;
 46}
 47
 48typedef int (*g_rand)(struct tcf_gact *gact);
 49static g_rand gact_rand[MAX_RAND] = { NULL, gact_net_rand, gact_determ };
 50#endif /* CONFIG_GACT_PROB */
 51
 52static const struct nla_policy gact_policy[TCA_GACT_MAX + 1] = {
 53	[TCA_GACT_PARMS]	= { .len = sizeof(struct tc_gact) },
 54	[TCA_GACT_PROB]		= { .len = sizeof(struct tc_gact_p) },
 55};
 56
 57static int tcf_gact_init(struct net *net, struct nlattr *nla,
 58			 struct nlattr *est, struct tc_action **a,
 59			 int ovr, int bind, struct netlink_ext_ack *extack)
 
 60{
 61	struct tc_action_net *tn = net_generic(net, gact_net_id);
 62	struct nlattr *tb[TCA_GACT_MAX + 1];
 
 63	struct tc_gact *parm;
 64	struct tcf_gact *gact;
 65	int ret = 0;
 
 66	int err;
 67#ifdef CONFIG_GACT_PROB
 68	struct tc_gact_p *p_parm = NULL;
 69#endif
 70
 71	if (nla == NULL)
 72		return -EINVAL;
 73
 74	err = nla_parse_nested(tb, TCA_GACT_MAX, nla, gact_policy, NULL);
 
 75	if (err < 0)
 76		return err;
 77
 78	if (tb[TCA_GACT_PARMS] == NULL)
 79		return -EINVAL;
 80	parm = nla_data(tb[TCA_GACT_PARMS]);
 
 81
 82#ifndef CONFIG_GACT_PROB
 83	if (tb[TCA_GACT_PROB] != NULL)
 84		return -EOPNOTSUPP;
 85#else
 86	if (tb[TCA_GACT_PROB]) {
 87		p_parm = nla_data(tb[TCA_GACT_PROB]);
 88		if (p_parm->ptype >= MAX_RAND)
 89			return -EINVAL;
 
 
 
 
 
 90	}
 91#endif
 92
 93	if (!tcf_idr_check(tn, parm->index, a, bind)) {
 94		ret = tcf_idr_create(tn, parm->index, est, a,
 
 95				     &act_gact_ops, bind, true);
 96		if (ret)
 
 97			return ret;
 
 98		ret = ACT_P_CREATED;
 99	} else {
100		if (bind)/* dont override defaults */
101			return 0;
102		tcf_idr_release(*a, bind);
103		if (!ovr)
104			return -EEXIST;
 
 
 
105	}
106
 
 
 
107	gact = to_gact(*a);
108
109	ASSERT_RTNL();
110	gact->tcf_action = parm->action;
111#ifdef CONFIG_GACT_PROB
112	if (p_parm) {
113		gact->tcfg_paction = p_parm->paction;
114		gact->tcfg_pval    = max_t(u16, 1, p_parm->pval);
115		/* Make sure tcfg_pval is written before tcfg_ptype
116		 * coupled with smp_rmb() in gact_net_rand() & gact_determ()
117		 */
118		smp_wmb();
119		gact->tcfg_ptype   = p_parm->ptype;
120	}
121#endif
 
 
 
 
 
122	if (ret == ACT_P_CREATED)
123		tcf_idr_insert(tn, *a);
124	return ret;
 
 
 
125}
126
127static int tcf_gact(struct sk_buff *skb, const struct tc_action *a,
128		    struct tcf_result *res)
129{
130	struct tcf_gact *gact = to_gact(a);
131	int action = READ_ONCE(gact->tcf_action);
132
133#ifdef CONFIG_GACT_PROB
134	{
135	u32 ptype = READ_ONCE(gact->tcfg_ptype);
136
137	if (ptype)
138		action = gact_rand[ptype](gact);
139	}
140#endif
141	bstats_cpu_update(this_cpu_ptr(gact->common.cpu_bstats), skb);
142	if (action == TC_ACT_SHOT)
143		qstats_drop_inc(this_cpu_ptr(gact->common.cpu_qstats));
144
145	tcf_lastuse_update(&gact->tcf_tm);
146
147	return action;
148}
149
150static void tcf_gact_stats_update(struct tc_action *a, u64 bytes, u32 packets,
151				  u64 lastuse)
152{
153	struct tcf_gact *gact = to_gact(a);
154	int action = READ_ONCE(gact->tcf_action);
155	struct tcf_t *tm = &gact->tcf_tm;
156
157	_bstats_cpu_update(this_cpu_ptr(gact->common.cpu_bstats), bytes,
158			   packets);
159	if (action == TC_ACT_SHOT)
160		this_cpu_ptr(gact->common.cpu_qstats)->drops += packets;
161
 
 
 
 
162	tm->lastuse = max_t(u64, tm->lastuse, lastuse);
163}
164
165static int tcf_gact_dump(struct sk_buff *skb, struct tc_action *a,
166			 int bind, int ref)
167{
168	unsigned char *b = skb_tail_pointer(skb);
169	struct tcf_gact *gact = to_gact(a);
170	struct tc_gact opt = {
171		.index   = gact->tcf_index,
172		.refcnt  = gact->tcf_refcnt - ref,
173		.bindcnt = gact->tcf_bindcnt - bind,
174		.action  = gact->tcf_action,
175	};
176	struct tcf_t t;
177
 
 
178	if (nla_put(skb, TCA_GACT_PARMS, sizeof(opt), &opt))
179		goto nla_put_failure;
180#ifdef CONFIG_GACT_PROB
181	if (gact->tcfg_ptype) {
182		struct tc_gact_p p_opt = {
183			.paction = gact->tcfg_paction,
184			.pval    = gact->tcfg_pval,
185			.ptype   = gact->tcfg_ptype,
186		};
187
188		if (nla_put(skb, TCA_GACT_PROB, sizeof(p_opt), &p_opt))
189			goto nla_put_failure;
190	}
191#endif
192	tcf_tm_dump(&t, &gact->tcf_tm);
193	if (nla_put_64bit(skb, TCA_GACT_TM, sizeof(t), &t, TCA_GACT_PAD))
194		goto nla_put_failure;
 
 
195	return skb->len;
196
197nla_put_failure:
 
198	nlmsg_trim(skb, b);
199	return -1;
200}
201
202static int tcf_gact_walker(struct net *net, struct sk_buff *skb,
203			   struct netlink_callback *cb, int type,
204			   const struct tc_action_ops *ops,
205			   struct netlink_ext_ack *extack)
206{
207	struct tc_action_net *tn = net_generic(net, gact_net_id);
208
209	return tcf_generic_walker(tn, skb, cb, type, ops, extack);
210}
211
212static int tcf_gact_search(struct net *net, struct tc_action **a, u32 index,
213			   struct netlink_ext_ack *extack)
214{
215	struct tc_action_net *tn = net_generic(net, gact_net_id);
216
217	return tcf_idr_search(tn, a, index);
218}
219
220static size_t tcf_gact_get_fill_size(const struct tc_action *act)
221{
222	size_t sz = nla_total_size(sizeof(struct tc_gact)); /* TCA_GACT_PARMS */
223
224#ifdef CONFIG_GACT_PROB
225	if (to_gact(act)->tcfg_ptype)
226		/* TCA_GACT_PROB */
227		sz += nla_total_size(sizeof(struct tc_gact_p));
228#endif
229
230	return sz;
231}
232
233static struct tc_action_ops act_gact_ops = {
234	.kind		=	"gact",
235	.type		=	TCA_ACT_GACT,
236	.owner		=	THIS_MODULE,
237	.act		=	tcf_gact,
238	.stats_update	=	tcf_gact_stats_update,
239	.dump		=	tcf_gact_dump,
240	.init		=	tcf_gact_init,
241	.walk		=	tcf_gact_walker,
242	.lookup		=	tcf_gact_search,
243	.get_fill_size	=	tcf_gact_get_fill_size,
244	.size		=	sizeof(struct tcf_gact),
245};
246
247static __net_init int gact_init_net(struct net *net)
248{
249	struct tc_action_net *tn = net_generic(net, gact_net_id);
250
251	return tc_action_net_init(tn, &act_gact_ops);
252}
253
254static void __net_exit gact_exit_net(struct list_head *net_list)
255{
256	tc_action_net_exit(net_list, gact_net_id);
257}
258
259static struct pernet_operations gact_net_ops = {
260	.init = gact_init_net,
261	.exit_batch = gact_exit_net,
262	.id   = &gact_net_id,
263	.size = sizeof(struct tc_action_net),
264};
265
266MODULE_AUTHOR("Jamal Hadi Salim(2002-4)");
267MODULE_DESCRIPTION("Generic Classifier actions");
268MODULE_LICENSE("GPL");
269
270static int __init gact_init_module(void)
271{
272#ifdef CONFIG_GACT_PROB
273	pr_info("GACT probability on\n");
274#else
275	pr_info("GACT probability NOT on\n");
276#endif
277
278	return tcf_register_action(&act_gact_ops, &gact_net_ops);
279}
280
281static void __exit gact_cleanup_module(void)
282{
283	tcf_unregister_action(&act_gact_ops, &gact_net_ops);
284}
285
286module_init(gact_init_module);
287module_exit(gact_cleanup_module);

  1// SPDX-License-Identifier: GPL-2.0-or-later
  2/*
  3 * net/sched/act_gact.c		Generic actions
  4 *
 
 
 
 
 
  5 * copyright 	Jamal Hadi Salim (2002-4)
 
  6 */
  7
  8#include <linux/types.h>
  9#include <linux/kernel.h>
 10#include <linux/string.h>
 11#include <linux/errno.h>
 12#include <linux/skbuff.h>
 13#include <linux/rtnetlink.h>
 14#include <linux/module.h>
 15#include <linux/init.h>
 16#include <net/netlink.h>
 17#include <net/pkt_sched.h>
 18#include <net/pkt_cls.h>
 19#include <linux/tc_act/tc_gact.h>
 20#include <net/tc_act/tc_gact.h>
 21
 22static unsigned int gact_net_id;
 23static struct tc_action_ops act_gact_ops;
 24
 25#ifdef CONFIG_GACT_PROB
 26static int gact_net_rand(struct tcf_gact *gact)
 27{
 28	smp_rmb(); /* coupled with smp_wmb() in tcf_gact_init() */
 29	if (prandom_u32() % gact->tcfg_pval)
 30		return gact->tcf_action;
 31	return gact->tcfg_paction;
 32}
 33
 34static int gact_determ(struct tcf_gact *gact)
 35{
 36	u32 pack = atomic_inc_return(&gact->packets);
 37
 38	smp_rmb(); /* coupled with smp_wmb() in tcf_gact_init() */
 39	if (pack % gact->tcfg_pval)
 40		return gact->tcf_action;
 41	return gact->tcfg_paction;
 42}
 43
 44typedef int (*g_rand)(struct tcf_gact *gact);
 45static g_rand gact_rand[MAX_RAND] = { NULL, gact_net_rand, gact_determ };
 46#endif /* CONFIG_GACT_PROB */
 47
 48static const struct nla_policy gact_policy[TCA_GACT_MAX + 1] = {
 49	[TCA_GACT_PARMS]	= { .len = sizeof(struct tc_gact) },
 50	[TCA_GACT_PROB]		= { .len = sizeof(struct tc_gact_p) },
 51};
 52
 53static int tcf_gact_init(struct net *net, struct nlattr *nla,
 54			 struct nlattr *est, struct tc_action **a,
 55			 int ovr, int bind, bool rtnl_held,
 56			 struct tcf_proto *tp, struct netlink_ext_ack *extack)
 57{
 58	struct tc_action_net *tn = net_generic(net, gact_net_id);
 59	struct nlattr *tb[TCA_GACT_MAX + 1];
 60	struct tcf_chain *goto_ch = NULL;
 61	struct tc_gact *parm;
 62	struct tcf_gact *gact;
 63	int ret = 0;
 64	u32 index;
 65	int err;
 66#ifdef CONFIG_GACT_PROB
 67	struct tc_gact_p *p_parm = NULL;
 68#endif
 69
 70	if (nla == NULL)
 71		return -EINVAL;
 72
 73	err = nla_parse_nested_deprecated(tb, TCA_GACT_MAX, nla, gact_policy,
 74					  NULL);
 75	if (err < 0)
 76		return err;
 77
 78	if (tb[TCA_GACT_PARMS] == NULL)
 79		return -EINVAL;
 80	parm = nla_data(tb[TCA_GACT_PARMS]);
 81	index = parm->index;
 82
 83#ifndef CONFIG_GACT_PROB
 84	if (tb[TCA_GACT_PROB] != NULL)
 85		return -EOPNOTSUPP;
 86#else
 87	if (tb[TCA_GACT_PROB]) {
 88		p_parm = nla_data(tb[TCA_GACT_PROB]);
 89		if (p_parm->ptype >= MAX_RAND)
 90			return -EINVAL;
 91		if (TC_ACT_EXT_CMP(p_parm->paction, TC_ACT_GOTO_CHAIN)) {
 92			NL_SET_ERR_MSG(extack,
 93				       "goto chain not allowed on fallback");
 94			return -EINVAL;
 95		}
 96	}
 97#endif
 98
 99	err = tcf_idr_check_alloc(tn, &index, a, bind);
100	if (!err) {
101		ret = tcf_idr_create(tn, index, est, a,
102				     &act_gact_ops, bind, true);
103		if (ret) {
104			tcf_idr_cleanup(tn, index);
105			return ret;
106		}
107		ret = ACT_P_CREATED;
108	} else if (err > 0) {
109		if (bind)/* dont override defaults */
110			return 0;
111		if (!ovr) {
112			tcf_idr_release(*a, bind);
113			return -EEXIST;
114		}
115	} else {
116		return err;
117	}
118
119	err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack);
120	if (err < 0)
121		goto release_idr;
122	gact = to_gact(*a);
123
124	spin_lock_bh(&gact->tcf_lock);
125	goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
126#ifdef CONFIG_GACT_PROB
127	if (p_parm) {
128		gact->tcfg_paction = p_parm->paction;
129		gact->tcfg_pval    = max_t(u16, 1, p_parm->pval);
130		/* Make sure tcfg_pval is written before tcfg_ptype
131		 * coupled with smp_rmb() in gact_net_rand() & gact_determ()
132		 */
133		smp_wmb();
134		gact->tcfg_ptype   = p_parm->ptype;
135	}
136#endif
137	spin_unlock_bh(&gact->tcf_lock);
138
139	if (goto_ch)
140		tcf_chain_put_by_act(goto_ch);
141
142	if (ret == ACT_P_CREATED)
143		tcf_idr_insert(tn, *a);
144	return ret;
145release_idr:
146	tcf_idr_release(*a, bind);
147	return err;
148}
149
150static int tcf_gact_act(struct sk_buff *skb, const struct tc_action *a,
151			struct tcf_result *res)
152{
153	struct tcf_gact *gact = to_gact(a);
154	int action = READ_ONCE(gact->tcf_action);
155
156#ifdef CONFIG_GACT_PROB
157	{
158	u32 ptype = READ_ONCE(gact->tcfg_ptype);
159
160	if (ptype)
161		action = gact_rand[ptype](gact);
162	}
163#endif
164	bstats_cpu_update(this_cpu_ptr(gact->common.cpu_bstats), skb);
165	if (action == TC_ACT_SHOT)
166		qstats_drop_inc(this_cpu_ptr(gact->common.cpu_qstats));
167
168	tcf_lastuse_update(&gact->tcf_tm);
169
170	return action;
171}
172
173static void tcf_gact_stats_update(struct tc_action *a, u64 bytes, u32 packets,
174				  u64 lastuse, bool hw)
175{
176	struct tcf_gact *gact = to_gact(a);
177	int action = READ_ONCE(gact->tcf_action);
178	struct tcf_t *tm = &gact->tcf_tm;
179
180	_bstats_cpu_update(this_cpu_ptr(gact->common.cpu_bstats), bytes,
181			   packets);
182	if (action == TC_ACT_SHOT)
183		this_cpu_ptr(gact->common.cpu_qstats)->drops += packets;
184
185	if (hw)
186		_bstats_cpu_update(this_cpu_ptr(gact->common.cpu_bstats_hw),
187				   bytes, packets);
188
189	tm->lastuse = max_t(u64, tm->lastuse, lastuse);
190}
191
192static int tcf_gact_dump(struct sk_buff *skb, struct tc_action *a,
193			 int bind, int ref)
194{
195	unsigned char *b = skb_tail_pointer(skb);
196	struct tcf_gact *gact = to_gact(a);
197	struct tc_gact opt = {
198		.index   = gact->tcf_index,
199		.refcnt  = refcount_read(&gact->tcf_refcnt) - ref,
200		.bindcnt = atomic_read(&gact->tcf_bindcnt) - bind,
 
201	};
202	struct tcf_t t;
203
204	spin_lock_bh(&gact->tcf_lock);
205	opt.action = gact->tcf_action;
206	if (nla_put(skb, TCA_GACT_PARMS, sizeof(opt), &opt))
207		goto nla_put_failure;
208#ifdef CONFIG_GACT_PROB
209	if (gact->tcfg_ptype) {
210		struct tc_gact_p p_opt = {
211			.paction = gact->tcfg_paction,
212			.pval    = gact->tcfg_pval,
213			.ptype   = gact->tcfg_ptype,
214		};
215
216		if (nla_put(skb, TCA_GACT_PROB, sizeof(p_opt), &p_opt))
217			goto nla_put_failure;
218	}
219#endif
220	tcf_tm_dump(&t, &gact->tcf_tm);
221	if (nla_put_64bit(skb, TCA_GACT_TM, sizeof(t), &t, TCA_GACT_PAD))
222		goto nla_put_failure;
223	spin_unlock_bh(&gact->tcf_lock);
224
225	return skb->len;
226
227nla_put_failure:
228	spin_unlock_bh(&gact->tcf_lock);
229	nlmsg_trim(skb, b);
230	return -1;
231}
232
233static int tcf_gact_walker(struct net *net, struct sk_buff *skb,
234			   struct netlink_callback *cb, int type,
235			   const struct tc_action_ops *ops,
236			   struct netlink_ext_ack *extack)
237{
238	struct tc_action_net *tn = net_generic(net, gact_net_id);
239
240	return tcf_generic_walker(tn, skb, cb, type, ops, extack);
241}
242
243static int tcf_gact_search(struct net *net, struct tc_action **a, u32 index)
 
244{
245	struct tc_action_net *tn = net_generic(net, gact_net_id);
246
247	return tcf_idr_search(tn, a, index);
248}
249
250static size_t tcf_gact_get_fill_size(const struct tc_action *act)
251{
252	size_t sz = nla_total_size(sizeof(struct tc_gact)); /* TCA_GACT_PARMS */
253
254#ifdef CONFIG_GACT_PROB
255	if (to_gact(act)->tcfg_ptype)
256		/* TCA_GACT_PROB */
257		sz += nla_total_size(sizeof(struct tc_gact_p));
258#endif
259
260	return sz;
261}
262
263static struct tc_action_ops act_gact_ops = {
264	.kind		=	"gact",
265	.id		=	TCA_ID_GACT,
266	.owner		=	THIS_MODULE,
267	.act		=	tcf_gact_act,
268	.stats_update	=	tcf_gact_stats_update,
269	.dump		=	tcf_gact_dump,
270	.init		=	tcf_gact_init,
271	.walk		=	tcf_gact_walker,
272	.lookup		=	tcf_gact_search,
273	.get_fill_size	=	tcf_gact_get_fill_size,
274	.size		=	sizeof(struct tcf_gact),
275};
276
277static __net_init int gact_init_net(struct net *net)
278{
279	struct tc_action_net *tn = net_generic(net, gact_net_id);
280
281	return tc_action_net_init(net, tn, &act_gact_ops);
282}
283
284static void __net_exit gact_exit_net(struct list_head *net_list)
285{
286	tc_action_net_exit(net_list, gact_net_id);
287}
288
289static struct pernet_operations gact_net_ops = {
290	.init = gact_init_net,
291	.exit_batch = gact_exit_net,
292	.id   = &gact_net_id,
293	.size = sizeof(struct tc_action_net),
294};
295
296MODULE_AUTHOR("Jamal Hadi Salim(2002-4)");
297MODULE_DESCRIPTION("Generic Classifier actions");
298MODULE_LICENSE("GPL");
299
300static int __init gact_init_module(void)
301{
302#ifdef CONFIG_GACT_PROB
303	pr_info("GACT probability on\n");
304#else
305	pr_info("GACT probability NOT on\n");
306#endif
307
308	return tcf_register_action(&act_gact_ops, &gact_net_ops);
309}
310
311static void __exit gact_cleanup_module(void)
312{
313	tcf_unregister_action(&act_gact_ops, &gact_net_ops);
314}
315
316module_init(gact_init_module);
317module_exit(gact_cleanup_module);