2 * net/sched/act_police.c Input police filter
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.
9 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
10 * J Hadi Salim (action changes)
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>
26 struct tcf_common common;
35 struct psched_ratecfg rate;
37 struct psched_ratecfg peak;
40 #define to_police(pc) \
41 container_of(pc->priv, struct tcf_police, common)
43 #define POL_TAB_MASK 15
45 /* old policer structure from before tc actions */
46 struct tc_police_compat {
52 struct tc_ratespec rate;
53 struct tc_ratespec peakrate;
56 /* Each policer is serialized by its individual spinlock */
58 static int police_net_id;
60 static int tcf_act_police_walker(struct net *net, struct sk_buff *skb,
61 struct netlink_callback *cb, int type,
64 struct tc_action_net *tn = net_generic(net, police_net_id);
65 struct tcf_hashinfo *hinfo = tn->hinfo;
66 struct hlist_head *head;
68 int err = 0, index = -1, i = 0, s_i = 0, n_i = 0;
71 spin_lock_bh(&hinfo->lock);
75 for (i = 0; i < (POL_TAB_MASK + 1); i++) {
76 head = &hinfo->htab[tcf_hash(i, POL_TAB_MASK)];
78 hlist_for_each_entry_rcu(p, head, tcfc_head) {
84 nest = nla_nest_start(skb, a->order);
87 if (type == RTM_DELACTION)
88 err = tcf_action_dump_1(skb, a, 0, 1);
90 err = tcf_action_dump_1(skb, a, 0, 0);
93 nla_nest_cancel(skb, nest);
96 nla_nest_end(skb, nest);
101 spin_unlock_bh(&hinfo->lock);
107 nla_nest_cancel(skb, nest);
111 static const struct nla_policy police_policy[TCA_POLICE_MAX + 1] = {
112 [TCA_POLICE_RATE] = { .len = TC_RTAB_SIZE },
113 [TCA_POLICE_PEAKRATE] = { .len = TC_RTAB_SIZE },
114 [TCA_POLICE_AVRATE] = { .type = NLA_U32 },
115 [TCA_POLICE_RESULT] = { .type = NLA_U32 },
118 static int tcf_act_police_init(struct net *net, struct nlattr *nla,
119 struct nlattr *est, struct tc_action *a,
123 struct nlattr *tb[TCA_POLICE_MAX + 1];
124 struct tc_police *parm;
125 struct tcf_police *police;
126 struct qdisc_rate_table *R_tab = NULL, *P_tab = NULL;
127 struct tc_action_net *tn = net_generic(net, police_net_id);
133 err = nla_parse_nested(tb, TCA_POLICE_MAX, nla, police_policy);
137 if (tb[TCA_POLICE_TBF] == NULL)
139 size = nla_len(tb[TCA_POLICE_TBF]);
140 if (size != sizeof(*parm) && size != sizeof(struct tc_police_compat))
142 parm = nla_data(tb[TCA_POLICE_TBF]);
145 if (tcf_hash_search(tn, a, parm->index)) {
146 police = to_police(a);
148 police->tcf_bindcnt += 1;
149 police->tcf_refcnt += 1;
158 ret = tcf_hash_create(tn, parm->index, NULL, a,
159 sizeof(*police), bind, false);
165 police = to_police(a);
167 if (parm->rate.rate) {
169 R_tab = qdisc_get_rtab(&parm->rate, tb[TCA_POLICE_RATE]);
173 if (parm->peakrate.rate) {
174 P_tab = qdisc_get_rtab(&parm->peakrate,
175 tb[TCA_POLICE_PEAKRATE]);
181 spin_lock_bh(&police->tcf_lock);
183 err = gen_replace_estimator(&police->tcf_bstats, NULL,
184 &police->tcf_rate_est,
189 } else if (tb[TCA_POLICE_AVRATE] &&
190 (ret == ACT_P_CREATED ||
191 !gen_estimator_active(&police->tcf_bstats,
192 &police->tcf_rate_est))) {
197 /* No failure allowed after this point */
198 police->tcfp_mtu = parm->mtu;
199 if (police->tcfp_mtu == 0) {
200 police->tcfp_mtu = ~0;
202 police->tcfp_mtu = 255 << R_tab->rate.cell_log;
205 police->rate_present = true;
206 psched_ratecfg_precompute(&police->rate, &R_tab->rate, 0);
207 qdisc_put_rtab(R_tab);
209 police->rate_present = false;
212 police->peak_present = true;
213 psched_ratecfg_precompute(&police->peak, &P_tab->rate, 0);
214 qdisc_put_rtab(P_tab);
216 police->peak_present = false;
219 if (tb[TCA_POLICE_RESULT])
220 police->tcfp_result = nla_get_u32(tb[TCA_POLICE_RESULT]);
221 police->tcfp_burst = PSCHED_TICKS2NS(parm->burst);
222 police->tcfp_toks = police->tcfp_burst;
223 if (police->peak_present) {
224 police->tcfp_mtu_ptoks = (s64) psched_l2t_ns(&police->peak,
226 police->tcfp_ptoks = police->tcfp_mtu_ptoks;
228 police->tcf_action = parm->action;
230 if (tb[TCA_POLICE_AVRATE])
231 police->tcfp_ewma_rate = nla_get_u32(tb[TCA_POLICE_AVRATE]);
233 spin_unlock_bh(&police->tcf_lock);
234 if (ret != ACT_P_CREATED)
237 police->tcfp_t_c = ktime_get_ns();
238 tcf_hash_insert(tn, a);
243 spin_unlock_bh(&police->tcf_lock);
245 qdisc_put_rtab(P_tab);
246 qdisc_put_rtab(R_tab);
247 if (ret == ACT_P_CREATED)
248 tcf_hash_cleanup(a, est);
252 static int tcf_act_police(struct sk_buff *skb, const struct tc_action *a,
253 struct tcf_result *res)
255 struct tcf_police *police = a->priv;
260 spin_lock(&police->tcf_lock);
262 bstats_update(&police->tcf_bstats, skb);
263 tcf_lastuse_update(&police->tcf_tm);
265 if (police->tcfp_ewma_rate &&
266 police->tcf_rate_est.bps >= police->tcfp_ewma_rate) {
267 police->tcf_qstats.overlimits++;
268 if (police->tcf_action == TC_ACT_SHOT)
269 police->tcf_qstats.drops++;
270 spin_unlock(&police->tcf_lock);
271 return police->tcf_action;
274 if (qdisc_pkt_len(skb) <= police->tcfp_mtu) {
275 if (!police->rate_present) {
276 spin_unlock(&police->tcf_lock);
277 return police->tcfp_result;
280 now = ktime_get_ns();
281 toks = min_t(s64, now - police->tcfp_t_c,
283 if (police->peak_present) {
284 ptoks = toks + police->tcfp_ptoks;
285 if (ptoks > police->tcfp_mtu_ptoks)
286 ptoks = police->tcfp_mtu_ptoks;
287 ptoks -= (s64) psched_l2t_ns(&police->peak,
290 toks += police->tcfp_toks;
291 if (toks > police->tcfp_burst)
292 toks = police->tcfp_burst;
293 toks -= (s64) psched_l2t_ns(&police->rate, qdisc_pkt_len(skb));
294 if ((toks|ptoks) >= 0) {
295 police->tcfp_t_c = now;
296 police->tcfp_toks = toks;
297 police->tcfp_ptoks = ptoks;
298 spin_unlock(&police->tcf_lock);
299 return police->tcfp_result;
303 police->tcf_qstats.overlimits++;
304 if (police->tcf_action == TC_ACT_SHOT)
305 police->tcf_qstats.drops++;
306 spin_unlock(&police->tcf_lock);
307 return police->tcf_action;
311 tcf_act_police_dump(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
313 unsigned char *b = skb_tail_pointer(skb);
314 struct tcf_police *police = a->priv;
315 struct tc_police opt = {
316 .index = police->tcf_index,
317 .action = police->tcf_action,
318 .mtu = police->tcfp_mtu,
319 .burst = PSCHED_NS2TICKS(police->tcfp_burst),
320 .refcnt = police->tcf_refcnt - ref,
321 .bindcnt = police->tcf_bindcnt - bind,
325 if (police->rate_present)
326 psched_ratecfg_getrate(&opt.rate, &police->rate);
327 if (police->peak_present)
328 psched_ratecfg_getrate(&opt.peakrate, &police->peak);
329 if (nla_put(skb, TCA_POLICE_TBF, sizeof(opt), &opt))
330 goto nla_put_failure;
331 if (police->tcfp_result &&
332 nla_put_u32(skb, TCA_POLICE_RESULT, police->tcfp_result))
333 goto nla_put_failure;
334 if (police->tcfp_ewma_rate &&
335 nla_put_u32(skb, TCA_POLICE_AVRATE, police->tcfp_ewma_rate))
336 goto nla_put_failure;
338 t.install = jiffies_to_clock_t(jiffies - police->tcf_tm.install);
339 t.lastuse = jiffies_to_clock_t(jiffies - police->tcf_tm.lastuse);
340 t.firstuse = jiffies_to_clock_t(jiffies - police->tcf_tm.firstuse);
341 t.expires = jiffies_to_clock_t(police->tcf_tm.expires);
342 if (nla_put_64bit(skb, TCA_POLICE_TM, sizeof(t), &t, TCA_POLICE_PAD))
343 goto nla_put_failure;
352 static int tcf_police_search(struct net *net, struct tc_action *a, u32 index)
354 struct tc_action_net *tn = net_generic(net, police_net_id);
356 return tcf_hash_search(tn, a, index);
359 MODULE_AUTHOR("Alexey Kuznetsov");
360 MODULE_DESCRIPTION("Policing actions");
361 MODULE_LICENSE("GPL");
363 static struct tc_action_ops act_police_ops = {
365 .type = TCA_ID_POLICE,
366 .owner = THIS_MODULE,
367 .act = tcf_act_police,
368 .dump = tcf_act_police_dump,
369 .init = tcf_act_police_init,
370 .walk = tcf_act_police_walker,
371 .lookup = tcf_police_search,
374 static __net_init int police_init_net(struct net *net)
376 struct tc_action_net *tn = net_generic(net, police_net_id);
378 return tc_action_net_init(tn, &act_police_ops, POL_TAB_MASK);
381 static void __net_exit police_exit_net(struct net *net)
383 struct tc_action_net *tn = net_generic(net, police_net_id);
385 tc_action_net_exit(tn);
388 static struct pernet_operations police_net_ops = {
389 .init = police_init_net,
390 .exit = police_exit_net,
391 .id = &police_net_id,
392 .size = sizeof(struct tc_action_net),
396 police_init_module(void)
398 return tcf_register_action(&act_police_ops, &police_net_ops);
402 police_cleanup_module(void)
404 tcf_unregister_action(&act_police_ops, &police_net_ops);
407 module_init(police_init_module);
408 module_exit(police_cleanup_module);