Loading...
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * net/sched/act_police.c Input police filter
4 *
5 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
6 * J Hadi Salim (action changes)
7 */
8
9#include <linux/module.h>
10#include <linux/types.h>
11#include <linux/kernel.h>
12#include <linux/string.h>
13#include <linux/errno.h>
14#include <linux/skbuff.h>
15#include <linux/rtnetlink.h>
16#include <linux/init.h>
17#include <linux/slab.h>
18#include <net/act_api.h>
19#include <net/netlink.h>
20#include <net/pkt_cls.h>
21#include <net/tc_act/tc_police.h>
22
23/* Each policer is serialized by its individual spinlock */
24
25static unsigned int police_net_id;
26static struct tc_action_ops act_police_ops;
27
28static int tcf_police_walker(struct net *net, struct sk_buff *skb,
29 struct netlink_callback *cb, int type,
30 const struct tc_action_ops *ops,
31 struct netlink_ext_ack *extack)
32{
33 struct tc_action_net *tn = net_generic(net, police_net_id);
34
35 return tcf_generic_walker(tn, skb, cb, type, ops, extack);
36}
37
38static 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 },
43 [TCA_POLICE_RATE64] = { .type = NLA_U64 },
44 [TCA_POLICE_PEAKRATE64] = { .type = NLA_U64 },
45};
46
47static int tcf_police_init(struct net *net, struct nlattr *nla,
48 struct nlattr *est, struct tc_action **a,
49 int ovr, int bind, bool rtnl_held,
50 struct tcf_proto *tp,
51 struct netlink_ext_ack *extack)
52{
53 int ret = 0, tcfp_result = TC_ACT_OK, err, size;
54 struct nlattr *tb[TCA_POLICE_MAX + 1];
55 struct tcf_chain *goto_ch = NULL;
56 struct tc_police *parm;
57 struct tcf_police *police;
58 struct qdisc_rate_table *R_tab = NULL, *P_tab = NULL;
59 struct tc_action_net *tn = net_generic(net, police_net_id);
60 struct tcf_police_params *new;
61 bool exists = false;
62 u32 index;
63 u64 rate64, prate64;
64
65 if (nla == NULL)
66 return -EINVAL;
67
68 err = nla_parse_nested_deprecated(tb, TCA_POLICE_MAX, nla,
69 police_policy, NULL);
70 if (err < 0)
71 return err;
72
73 if (tb[TCA_POLICE_TBF] == NULL)
74 return -EINVAL;
75 size = nla_len(tb[TCA_POLICE_TBF]);
76 if (size != sizeof(*parm) && size != sizeof(struct tc_police_compat))
77 return -EINVAL;
78
79 parm = nla_data(tb[TCA_POLICE_TBF]);
80 index = parm->index;
81 err = tcf_idr_check_alloc(tn, &index, a, bind);
82 if (err < 0)
83 return err;
84 exists = err;
85 if (exists && bind)
86 return 0;
87
88 if (!exists) {
89 ret = tcf_idr_create(tn, index, NULL, a,
90 &act_police_ops, bind, true);
91 if (ret) {
92 tcf_idr_cleanup(tn, index);
93 return ret;
94 }
95 ret = ACT_P_CREATED;
96 spin_lock_init(&(to_police(*a)->tcfp_lock));
97 } else if (!ovr) {
98 tcf_idr_release(*a, bind);
99 return -EEXIST;
100 }
101 err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack);
102 if (err < 0)
103 goto release_idr;
104
105 police = to_police(*a);
106 if (parm->rate.rate) {
107 err = -ENOMEM;
108 R_tab = qdisc_get_rtab(&parm->rate, tb[TCA_POLICE_RATE], NULL);
109 if (R_tab == NULL)
110 goto failure;
111
112 if (parm->peakrate.rate) {
113 P_tab = qdisc_get_rtab(&parm->peakrate,
114 tb[TCA_POLICE_PEAKRATE], NULL);
115 if (P_tab == NULL)
116 goto failure;
117 }
118 }
119
120 if (est) {
121 err = gen_replace_estimator(&police->tcf_bstats,
122 police->common.cpu_bstats,
123 &police->tcf_rate_est,
124 &police->tcf_lock,
125 NULL, est);
126 if (err)
127 goto failure;
128 } else if (tb[TCA_POLICE_AVRATE] &&
129 (ret == ACT_P_CREATED ||
130 !gen_estimator_active(&police->tcf_rate_est))) {
131 err = -EINVAL;
132 goto failure;
133 }
134
135 if (tb[TCA_POLICE_RESULT]) {
136 tcfp_result = nla_get_u32(tb[TCA_POLICE_RESULT]);
137 if (TC_ACT_EXT_CMP(tcfp_result, TC_ACT_GOTO_CHAIN)) {
138 NL_SET_ERR_MSG(extack,
139 "goto chain not allowed on fallback");
140 err = -EINVAL;
141 goto failure;
142 }
143 }
144
145 new = kzalloc(sizeof(*new), GFP_KERNEL);
146 if (unlikely(!new)) {
147 err = -ENOMEM;
148 goto failure;
149 }
150
151 /* No failure allowed after this point */
152 new->tcfp_result = tcfp_result;
153 new->tcfp_mtu = parm->mtu;
154 if (!new->tcfp_mtu) {
155 new->tcfp_mtu = ~0;
156 if (R_tab)
157 new->tcfp_mtu = 255 << R_tab->rate.cell_log;
158 }
159 if (R_tab) {
160 new->rate_present = true;
161 rate64 = tb[TCA_POLICE_RATE64] ?
162 nla_get_u64(tb[TCA_POLICE_RATE64]) : 0;
163 psched_ratecfg_precompute(&new->rate, &R_tab->rate, rate64);
164 qdisc_put_rtab(R_tab);
165 } else {
166 new->rate_present = false;
167 }
168 if (P_tab) {
169 new->peak_present = true;
170 prate64 = tb[TCA_POLICE_PEAKRATE64] ?
171 nla_get_u64(tb[TCA_POLICE_PEAKRATE64]) : 0;
172 psched_ratecfg_precompute(&new->peak, &P_tab->rate, prate64);
173 qdisc_put_rtab(P_tab);
174 } else {
175 new->peak_present = false;
176 }
177
178 new->tcfp_burst = PSCHED_TICKS2NS(parm->burst);
179 if (new->peak_present)
180 new->tcfp_mtu_ptoks = (s64)psched_l2t_ns(&new->peak,
181 new->tcfp_mtu);
182
183 if (tb[TCA_POLICE_AVRATE])
184 new->tcfp_ewma_rate = nla_get_u32(tb[TCA_POLICE_AVRATE]);
185
186 spin_lock_bh(&police->tcf_lock);
187 spin_lock_bh(&police->tcfp_lock);
188 police->tcfp_t_c = ktime_get_ns();
189 police->tcfp_toks = new->tcfp_burst;
190 if (new->peak_present)
191 police->tcfp_ptoks = new->tcfp_mtu_ptoks;
192 spin_unlock_bh(&police->tcfp_lock);
193 goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
194 rcu_swap_protected(police->params,
195 new,
196 lockdep_is_held(&police->tcf_lock));
197 spin_unlock_bh(&police->tcf_lock);
198
199 if (goto_ch)
200 tcf_chain_put_by_act(goto_ch);
201 if (new)
202 kfree_rcu(new, rcu);
203
204 if (ret == ACT_P_CREATED)
205 tcf_idr_insert(tn, *a);
206 return ret;
207
208failure:
209 qdisc_put_rtab(P_tab);
210 qdisc_put_rtab(R_tab);
211 if (goto_ch)
212 tcf_chain_put_by_act(goto_ch);
213release_idr:
214 tcf_idr_release(*a, bind);
215 return err;
216}
217
218static int tcf_police_act(struct sk_buff *skb, const struct tc_action *a,
219 struct tcf_result *res)
220{
221 struct tcf_police *police = to_police(a);
222 struct tcf_police_params *p;
223 s64 now, toks, ptoks = 0;
224 int ret;
225
226 tcf_lastuse_update(&police->tcf_tm);
227 bstats_cpu_update(this_cpu_ptr(police->common.cpu_bstats), skb);
228
229 ret = READ_ONCE(police->tcf_action);
230 p = rcu_dereference_bh(police->params);
231
232 if (p->tcfp_ewma_rate) {
233 struct gnet_stats_rate_est64 sample;
234
235 if (!gen_estimator_read(&police->tcf_rate_est, &sample) ||
236 sample.bps >= p->tcfp_ewma_rate)
237 goto inc_overlimits;
238 }
239
240 if (qdisc_pkt_len(skb) <= p->tcfp_mtu) {
241 if (!p->rate_present) {
242 ret = p->tcfp_result;
243 goto end;
244 }
245
246 now = ktime_get_ns();
247 spin_lock_bh(&police->tcfp_lock);
248 toks = min_t(s64, now - police->tcfp_t_c, p->tcfp_burst);
249 if (p->peak_present) {
250 ptoks = toks + police->tcfp_ptoks;
251 if (ptoks > p->tcfp_mtu_ptoks)
252 ptoks = p->tcfp_mtu_ptoks;
253 ptoks -= (s64)psched_l2t_ns(&p->peak,
254 qdisc_pkt_len(skb));
255 }
256 toks += police->tcfp_toks;
257 if (toks > p->tcfp_burst)
258 toks = p->tcfp_burst;
259 toks -= (s64)psched_l2t_ns(&p->rate, qdisc_pkt_len(skb));
260 if ((toks|ptoks) >= 0) {
261 police->tcfp_t_c = now;
262 police->tcfp_toks = toks;
263 police->tcfp_ptoks = ptoks;
264 spin_unlock_bh(&police->tcfp_lock);
265 ret = p->tcfp_result;
266 goto inc_drops;
267 }
268 spin_unlock_bh(&police->tcfp_lock);
269 }
270
271inc_overlimits:
272 qstats_overlimit_inc(this_cpu_ptr(police->common.cpu_qstats));
273inc_drops:
274 if (ret == TC_ACT_SHOT)
275 qstats_drop_inc(this_cpu_ptr(police->common.cpu_qstats));
276end:
277 return ret;
278}
279
280static void tcf_police_cleanup(struct tc_action *a)
281{
282 struct tcf_police *police = to_police(a);
283 struct tcf_police_params *p;
284
285 p = rcu_dereference_protected(police->params, 1);
286 if (p)
287 kfree_rcu(p, rcu);
288}
289
290static void tcf_police_stats_update(struct tc_action *a,
291 u64 bytes, u32 packets,
292 u64 lastuse, bool hw)
293{
294 struct tcf_police *police = to_police(a);
295 struct tcf_t *tm = &police->tcf_tm;
296
297 _bstats_cpu_update(this_cpu_ptr(a->cpu_bstats), bytes, packets);
298 if (hw)
299 _bstats_cpu_update(this_cpu_ptr(a->cpu_bstats_hw),
300 bytes, packets);
301 tm->lastuse = max_t(u64, tm->lastuse, lastuse);
302}
303
304static int tcf_police_dump(struct sk_buff *skb, struct tc_action *a,
305 int bind, int ref)
306{
307 unsigned char *b = skb_tail_pointer(skb);
308 struct tcf_police *police = to_police(a);
309 struct tcf_police_params *p;
310 struct tc_police opt = {
311 .index = police->tcf_index,
312 .refcnt = refcount_read(&police->tcf_refcnt) - ref,
313 .bindcnt = atomic_read(&police->tcf_bindcnt) - bind,
314 };
315 struct tcf_t t;
316
317 spin_lock_bh(&police->tcf_lock);
318 opt.action = police->tcf_action;
319 p = rcu_dereference_protected(police->params,
320 lockdep_is_held(&police->tcf_lock));
321 opt.mtu = p->tcfp_mtu;
322 opt.burst = PSCHED_NS2TICKS(p->tcfp_burst);
323 if (p->rate_present) {
324 psched_ratecfg_getrate(&opt.rate, &p->rate);
325 if ((police->params->rate.rate_bytes_ps >= (1ULL << 32)) &&
326 nla_put_u64_64bit(skb, TCA_POLICE_RATE64,
327 police->params->rate.rate_bytes_ps,
328 TCA_POLICE_PAD))
329 goto nla_put_failure;
330 }
331 if (p->peak_present) {
332 psched_ratecfg_getrate(&opt.peakrate, &p->peak);
333 if ((police->params->peak.rate_bytes_ps >= (1ULL << 32)) &&
334 nla_put_u64_64bit(skb, TCA_POLICE_PEAKRATE64,
335 police->params->peak.rate_bytes_ps,
336 TCA_POLICE_PAD))
337 goto nla_put_failure;
338 }
339 if (nla_put(skb, TCA_POLICE_TBF, sizeof(opt), &opt))
340 goto nla_put_failure;
341 if (p->tcfp_result &&
342 nla_put_u32(skb, TCA_POLICE_RESULT, p->tcfp_result))
343 goto nla_put_failure;
344 if (p->tcfp_ewma_rate &&
345 nla_put_u32(skb, TCA_POLICE_AVRATE, p->tcfp_ewma_rate))
346 goto nla_put_failure;
347
348 t.install = jiffies_to_clock_t(jiffies - police->tcf_tm.install);
349 t.lastuse = jiffies_to_clock_t(jiffies - police->tcf_tm.lastuse);
350 t.firstuse = jiffies_to_clock_t(jiffies - police->tcf_tm.firstuse);
351 t.expires = jiffies_to_clock_t(police->tcf_tm.expires);
352 if (nla_put_64bit(skb, TCA_POLICE_TM, sizeof(t), &t, TCA_POLICE_PAD))
353 goto nla_put_failure;
354 spin_unlock_bh(&police->tcf_lock);
355
356 return skb->len;
357
358nla_put_failure:
359 spin_unlock_bh(&police->tcf_lock);
360 nlmsg_trim(skb, b);
361 return -1;
362}
363
364static int tcf_police_search(struct net *net, struct tc_action **a, u32 index)
365{
366 struct tc_action_net *tn = net_generic(net, police_net_id);
367
368 return tcf_idr_search(tn, a, index);
369}
370
371MODULE_AUTHOR("Alexey Kuznetsov");
372MODULE_DESCRIPTION("Policing actions");
373MODULE_LICENSE("GPL");
374
375static struct tc_action_ops act_police_ops = {
376 .kind = "police",
377 .id = TCA_ID_POLICE,
378 .owner = THIS_MODULE,
379 .stats_update = tcf_police_stats_update,
380 .act = tcf_police_act,
381 .dump = tcf_police_dump,
382 .init = tcf_police_init,
383 .walk = tcf_police_walker,
384 .lookup = tcf_police_search,
385 .cleanup = tcf_police_cleanup,
386 .size = sizeof(struct tcf_police),
387};
388
389static __net_init int police_init_net(struct net *net)
390{
391 struct tc_action_net *tn = net_generic(net, police_net_id);
392
393 return tc_action_net_init(net, tn, &act_police_ops);
394}
395
396static void __net_exit police_exit_net(struct list_head *net_list)
397{
398 tc_action_net_exit(net_list, police_net_id);
399}
400
401static struct pernet_operations police_net_ops = {
402 .init = police_init_net,
403 .exit_batch = police_exit_net,
404 .id = &police_net_id,
405 .size = sizeof(struct tc_action_net),
406};
407
408static int __init police_init_module(void)
409{
410 return tcf_register_action(&act_police_ops, &police_net_ops);
411}
412
413static void __exit police_cleanup_module(void)
414{
415 tcf_unregister_action(&act_police_ops, &police_net_ops);
416}
417
418module_init(police_init_module);
419module_exit(police_cleanup_module);
1/*
2 * net/sched/police.c Input police filter.
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 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
10 * J Hadi Salim (action changes)
11 */
12
13#include <linux/module.h>
14#include <linux/types.h>
15#include <linux/kernel.h>
16#include <linux/string.h>
17#include <linux/errno.h>
18#include <linux/skbuff.h>
19#include <linux/rtnetlink.h>
20#include <linux/init.h>
21#include <linux/slab.h>
22#include <net/act_api.h>
23#include <net/netlink.h>
24
25#define L2T(p, L) qdisc_l2t((p)->tcfp_R_tab, L)
26#define L2T_P(p, L) qdisc_l2t((p)->tcfp_P_tab, L)
27
28#define POL_TAB_MASK 15
29static struct tcf_common *tcf_police_ht[POL_TAB_MASK + 1];
30static u32 police_idx_gen;
31static DEFINE_RWLOCK(police_lock);
32
33static struct tcf_hashinfo police_hash_info = {
34 .htab = tcf_police_ht,
35 .hmask = POL_TAB_MASK,
36 .lock = &police_lock,
37};
38
39/* old policer structure from before tc actions */
40struct tc_police_compat {
41 u32 index;
42 int action;
43 u32 limit;
44 u32 burst;
45 u32 mtu;
46 struct tc_ratespec rate;
47 struct tc_ratespec peakrate;
48};
49
50/* Each policer is serialized by its individual spinlock */
51
52static int tcf_act_police_walker(struct sk_buff *skb, struct netlink_callback *cb,
53 int type, struct tc_action *a)
54{
55 struct tcf_common *p;
56 int err = 0, index = -1, i = 0, s_i = 0, n_i = 0;
57 struct nlattr *nest;
58
59 read_lock_bh(&police_lock);
60
61 s_i = cb->args[0];
62
63 for (i = 0; i < (POL_TAB_MASK + 1); i++) {
64 p = tcf_police_ht[tcf_hash(i, POL_TAB_MASK)];
65
66 for (; p; p = p->tcfc_next) {
67 index++;
68 if (index < s_i)
69 continue;
70 a->priv = p;
71 a->order = index;
72 nest = nla_nest_start(skb, a->order);
73 if (nest == NULL)
74 goto nla_put_failure;
75 if (type == RTM_DELACTION)
76 err = tcf_action_dump_1(skb, a, 0, 1);
77 else
78 err = tcf_action_dump_1(skb, a, 0, 0);
79 if (err < 0) {
80 index--;
81 nla_nest_cancel(skb, nest);
82 goto done;
83 }
84 nla_nest_end(skb, nest);
85 n_i++;
86 }
87 }
88done:
89 read_unlock_bh(&police_lock);
90 if (n_i)
91 cb->args[0] += n_i;
92 return n_i;
93
94nla_put_failure:
95 nla_nest_cancel(skb, nest);
96 goto done;
97}
98
99static void tcf_police_destroy(struct tcf_police *p)
100{
101 unsigned int h = tcf_hash(p->tcf_index, POL_TAB_MASK);
102 struct tcf_common **p1p;
103
104 for (p1p = &tcf_police_ht[h]; *p1p; p1p = &(*p1p)->tcfc_next) {
105 if (*p1p == &p->common) {
106 write_lock_bh(&police_lock);
107 *p1p = p->tcf_next;
108 write_unlock_bh(&police_lock);
109 gen_kill_estimator(&p->tcf_bstats,
110 &p->tcf_rate_est);
111 if (p->tcfp_R_tab)
112 qdisc_put_rtab(p->tcfp_R_tab);
113 if (p->tcfp_P_tab)
114 qdisc_put_rtab(p->tcfp_P_tab);
115 /*
116 * gen_estimator est_timer() might access p->tcf_lock
117 * or bstats, wait a RCU grace period before freeing p
118 */
119 kfree_rcu(p, tcf_rcu);
120 return;
121 }
122 }
123 WARN_ON(1);
124}
125
126static const struct nla_policy police_policy[TCA_POLICE_MAX + 1] = {
127 [TCA_POLICE_RATE] = { .len = TC_RTAB_SIZE },
128 [TCA_POLICE_PEAKRATE] = { .len = TC_RTAB_SIZE },
129 [TCA_POLICE_AVRATE] = { .type = NLA_U32 },
130 [TCA_POLICE_RESULT] = { .type = NLA_U32 },
131};
132
133static int tcf_act_police_locate(struct nlattr *nla, struct nlattr *est,
134 struct tc_action *a, int ovr, int bind)
135{
136 unsigned int h;
137 int ret = 0, err;
138 struct nlattr *tb[TCA_POLICE_MAX + 1];
139 struct tc_police *parm;
140 struct tcf_police *police;
141 struct qdisc_rate_table *R_tab = NULL, *P_tab = NULL;
142 int size;
143
144 if (nla == NULL)
145 return -EINVAL;
146
147 err = nla_parse_nested(tb, TCA_POLICE_MAX, nla, police_policy);
148 if (err < 0)
149 return err;
150
151 if (tb[TCA_POLICE_TBF] == NULL)
152 return -EINVAL;
153 size = nla_len(tb[TCA_POLICE_TBF]);
154 if (size != sizeof(*parm) && size != sizeof(struct tc_police_compat))
155 return -EINVAL;
156 parm = nla_data(tb[TCA_POLICE_TBF]);
157
158 if (parm->index) {
159 struct tcf_common *pc;
160
161 pc = tcf_hash_lookup(parm->index, &police_hash_info);
162 if (pc != NULL) {
163 a->priv = pc;
164 police = to_police(pc);
165 if (bind) {
166 police->tcf_bindcnt += 1;
167 police->tcf_refcnt += 1;
168 }
169 if (ovr)
170 goto override;
171 return ret;
172 }
173 }
174
175 police = kzalloc(sizeof(*police), GFP_KERNEL);
176 if (police == NULL)
177 return -ENOMEM;
178 ret = ACT_P_CREATED;
179 police->tcf_refcnt = 1;
180 spin_lock_init(&police->tcf_lock);
181 if (bind)
182 police->tcf_bindcnt = 1;
183override:
184 if (parm->rate.rate) {
185 err = -ENOMEM;
186 R_tab = qdisc_get_rtab(&parm->rate, tb[TCA_POLICE_RATE]);
187 if (R_tab == NULL)
188 goto failure;
189
190 if (parm->peakrate.rate) {
191 P_tab = qdisc_get_rtab(&parm->peakrate,
192 tb[TCA_POLICE_PEAKRATE]);
193 if (P_tab == NULL)
194 goto failure;
195 }
196 }
197
198 spin_lock_bh(&police->tcf_lock);
199 if (est) {
200 err = gen_replace_estimator(&police->tcf_bstats,
201 &police->tcf_rate_est,
202 &police->tcf_lock, est);
203 if (err)
204 goto failure_unlock;
205 } else if (tb[TCA_POLICE_AVRATE] &&
206 (ret == ACT_P_CREATED ||
207 !gen_estimator_active(&police->tcf_bstats,
208 &police->tcf_rate_est))) {
209 err = -EINVAL;
210 goto failure_unlock;
211 }
212
213 /* No failure allowed after this point */
214 if (R_tab != NULL) {
215 qdisc_put_rtab(police->tcfp_R_tab);
216 police->tcfp_R_tab = R_tab;
217 }
218 if (P_tab != NULL) {
219 qdisc_put_rtab(police->tcfp_P_tab);
220 police->tcfp_P_tab = P_tab;
221 }
222
223 if (tb[TCA_POLICE_RESULT])
224 police->tcfp_result = nla_get_u32(tb[TCA_POLICE_RESULT]);
225 police->tcfp_toks = police->tcfp_burst = parm->burst;
226 police->tcfp_mtu = parm->mtu;
227 if (police->tcfp_mtu == 0) {
228 police->tcfp_mtu = ~0;
229 if (police->tcfp_R_tab)
230 police->tcfp_mtu = 255<<police->tcfp_R_tab->rate.cell_log;
231 }
232 if (police->tcfp_P_tab)
233 police->tcfp_ptoks = L2T_P(police, police->tcfp_mtu);
234 police->tcf_action = parm->action;
235
236 if (tb[TCA_POLICE_AVRATE])
237 police->tcfp_ewma_rate = nla_get_u32(tb[TCA_POLICE_AVRATE]);
238
239 spin_unlock_bh(&police->tcf_lock);
240 if (ret != ACT_P_CREATED)
241 return ret;
242
243 police->tcfp_t_c = psched_get_time();
244 police->tcf_index = parm->index ? parm->index :
245 tcf_hash_new_index(&police_idx_gen, &police_hash_info);
246 h = tcf_hash(police->tcf_index, POL_TAB_MASK);
247 write_lock_bh(&police_lock);
248 police->tcf_next = tcf_police_ht[h];
249 tcf_police_ht[h] = &police->common;
250 write_unlock_bh(&police_lock);
251
252 a->priv = police;
253 return ret;
254
255failure_unlock:
256 spin_unlock_bh(&police->tcf_lock);
257failure:
258 if (P_tab)
259 qdisc_put_rtab(P_tab);
260 if (R_tab)
261 qdisc_put_rtab(R_tab);
262 if (ret == ACT_P_CREATED)
263 kfree(police);
264 return err;
265}
266
267static int tcf_act_police_cleanup(struct tc_action *a, int bind)
268{
269 struct tcf_police *p = a->priv;
270 int ret = 0;
271
272 if (p != NULL) {
273 if (bind)
274 p->tcf_bindcnt--;
275
276 p->tcf_refcnt--;
277 if (p->tcf_refcnt <= 0 && !p->tcf_bindcnt) {
278 tcf_police_destroy(p);
279 ret = 1;
280 }
281 }
282 return ret;
283}
284
285static int tcf_act_police(struct sk_buff *skb, const struct tc_action *a,
286 struct tcf_result *res)
287{
288 struct tcf_police *police = a->priv;
289 psched_time_t now;
290 long toks;
291 long ptoks = 0;
292
293 spin_lock(&police->tcf_lock);
294
295 bstats_update(&police->tcf_bstats, skb);
296
297 if (police->tcfp_ewma_rate &&
298 police->tcf_rate_est.bps >= police->tcfp_ewma_rate) {
299 police->tcf_qstats.overlimits++;
300 if (police->tcf_action == TC_ACT_SHOT)
301 police->tcf_qstats.drops++;
302 spin_unlock(&police->tcf_lock);
303 return police->tcf_action;
304 }
305
306 if (qdisc_pkt_len(skb) <= police->tcfp_mtu) {
307 if (police->tcfp_R_tab == NULL) {
308 spin_unlock(&police->tcf_lock);
309 return police->tcfp_result;
310 }
311
312 now = psched_get_time();
313 toks = psched_tdiff_bounded(now, police->tcfp_t_c,
314 police->tcfp_burst);
315 if (police->tcfp_P_tab) {
316 ptoks = toks + police->tcfp_ptoks;
317 if (ptoks > (long)L2T_P(police, police->tcfp_mtu))
318 ptoks = (long)L2T_P(police, police->tcfp_mtu);
319 ptoks -= L2T_P(police, qdisc_pkt_len(skb));
320 }
321 toks += police->tcfp_toks;
322 if (toks > (long)police->tcfp_burst)
323 toks = police->tcfp_burst;
324 toks -= L2T(police, qdisc_pkt_len(skb));
325 if ((toks|ptoks) >= 0) {
326 police->tcfp_t_c = now;
327 police->tcfp_toks = toks;
328 police->tcfp_ptoks = ptoks;
329 spin_unlock(&police->tcf_lock);
330 return police->tcfp_result;
331 }
332 }
333
334 police->tcf_qstats.overlimits++;
335 if (police->tcf_action == TC_ACT_SHOT)
336 police->tcf_qstats.drops++;
337 spin_unlock(&police->tcf_lock);
338 return police->tcf_action;
339}
340
341static int
342tcf_act_police_dump(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
343{
344 unsigned char *b = skb_tail_pointer(skb);
345 struct tcf_police *police = a->priv;
346 struct tc_police opt = {
347 .index = police->tcf_index,
348 .action = police->tcf_action,
349 .mtu = police->tcfp_mtu,
350 .burst = police->tcfp_burst,
351 .refcnt = police->tcf_refcnt - ref,
352 .bindcnt = police->tcf_bindcnt - bind,
353 };
354
355 if (police->tcfp_R_tab)
356 opt.rate = police->tcfp_R_tab->rate;
357 if (police->tcfp_P_tab)
358 opt.peakrate = police->tcfp_P_tab->rate;
359 NLA_PUT(skb, TCA_POLICE_TBF, sizeof(opt), &opt);
360 if (police->tcfp_result)
361 NLA_PUT_U32(skb, TCA_POLICE_RESULT, police->tcfp_result);
362 if (police->tcfp_ewma_rate)
363 NLA_PUT_U32(skb, TCA_POLICE_AVRATE, police->tcfp_ewma_rate);
364 return skb->len;
365
366nla_put_failure:
367 nlmsg_trim(skb, b);
368 return -1;
369}
370
371MODULE_AUTHOR("Alexey Kuznetsov");
372MODULE_DESCRIPTION("Policing actions");
373MODULE_LICENSE("GPL");
374
375static struct tc_action_ops act_police_ops = {
376 .kind = "police",
377 .hinfo = &police_hash_info,
378 .type = TCA_ID_POLICE,
379 .capab = TCA_CAP_NONE,
380 .owner = THIS_MODULE,
381 .act = tcf_act_police,
382 .dump = tcf_act_police_dump,
383 .cleanup = tcf_act_police_cleanup,
384 .lookup = tcf_hash_search,
385 .init = tcf_act_police_locate,
386 .walk = tcf_act_police_walker
387};
388
389static int __init
390police_init_module(void)
391{
392 return tcf_register_action(&act_police_ops);
393}
394
395static void __exit
396police_cleanup_module(void)
397{
398 tcf_unregister_action(&act_police_ops);
399}
400
401module_init(police_init_module);
402module_exit(police_cleanup_module);