2 * net/sched/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 <net/act_api.h>
22 #include <net/netlink.h>
24 #define L2T(p,L) qdisc_l2t((p)->tcfp_R_tab, L)
25 #define L2T_P(p,L) qdisc_l2t((p)->tcfp_P_tab, L)
27 #define POL_TAB_MASK 15
28 static struct tcf_common *tcf_police_ht[POL_TAB_MASK + 1];
29 static u32 police_idx_gen;
30 static DEFINE_RWLOCK(police_lock);
32 static struct tcf_hashinfo police_hash_info = {
33 .htab = tcf_police_ht,
34 .hmask = POL_TAB_MASK,
38 /* old policer structure from before tc actions */
39 struct tc_police_compat
46 struct tc_ratespec rate;
47 struct tc_ratespec peakrate;
50 /* Each policer is serialized by its individual spinlock */
52 static int tcf_act_police_walker(struct sk_buff *skb, struct netlink_callback *cb,
53 int type, struct tc_action *a)
56 int err = 0, index = -1, i = 0, s_i = 0, n_i = 0;
59 read_lock_bh(&police_lock);
63 for (i = 0; i < (POL_TAB_MASK + 1); i++) {
64 p = tcf_police_ht[tcf_hash(i, POL_TAB_MASK)];
66 for (; p; p = p->tcfc_next) {
72 r = (struct nlattr *)skb_tail_pointer(skb);
73 NLA_PUT(skb, a->order, 0, NULL);
74 if (type == RTM_DELACTION)
75 err = tcf_action_dump_1(skb, a, 0, 1);
77 err = tcf_action_dump_1(skb, a, 0, 0);
83 r->nla_len = skb_tail_pointer(skb) - (u8 *)r;
88 read_unlock_bh(&police_lock);
98 static void tcf_police_destroy(struct tcf_police *p)
100 unsigned int h = tcf_hash(p->tcf_index, POL_TAB_MASK);
101 struct tcf_common **p1p;
103 for (p1p = &tcf_police_ht[h]; *p1p; p1p = &(*p1p)->tcfc_next) {
104 if (*p1p == &p->common) {
105 write_lock_bh(&police_lock);
107 write_unlock_bh(&police_lock);
108 gen_kill_estimator(&p->tcf_bstats,
111 qdisc_put_rtab(p->tcfp_R_tab);
113 qdisc_put_rtab(p->tcfp_P_tab);
121 static int tcf_act_police_locate(struct nlattr *nla, struct nlattr *est,
122 struct tc_action *a, int ovr, int bind)
126 struct nlattr *tb[TCA_POLICE_MAX + 1];
127 struct tc_police *parm;
128 struct tcf_police *police;
129 struct qdisc_rate_table *R_tab = NULL, *P_tab = NULL;
135 err = nla_parse_nested(tb, TCA_POLICE_MAX, nla, NULL);
139 if (tb[TCA_POLICE_TBF] == NULL)
141 size = nla_len(tb[TCA_POLICE_TBF]);
142 if (size != sizeof(*parm) && size != sizeof(struct tc_police_compat))
144 parm = nla_data(tb[TCA_POLICE_TBF]);
146 if (tb[TCA_POLICE_RESULT] != NULL &&
147 nla_len(tb[TCA_POLICE_RESULT]) != sizeof(u32))
149 if (tb[TCA_POLICE_RESULT] != NULL &&
150 nla_len(tb[TCA_POLICE_RESULT]) != sizeof(u32))
154 struct tcf_common *pc;
156 pc = tcf_hash_lookup(parm->index, &police_hash_info);
159 police = to_police(pc);
161 police->tcf_bindcnt += 1;
162 police->tcf_refcnt += 1;
170 police = kzalloc(sizeof(*police), GFP_KERNEL);
174 police->tcf_refcnt = 1;
175 spin_lock_init(&police->tcf_lock);
177 police->tcf_bindcnt = 1;
179 if (parm->rate.rate) {
181 R_tab = qdisc_get_rtab(&parm->rate, tb[TCA_POLICE_RATE]);
184 if (parm->peakrate.rate) {
185 P_tab = qdisc_get_rtab(&parm->peakrate,
186 tb[TCA_POLICE_PEAKRATE]);
188 qdisc_put_rtab(R_tab);
193 /* No failure allowed after this point */
194 spin_lock_bh(&police->tcf_lock);
196 qdisc_put_rtab(police->tcfp_R_tab);
197 police->tcfp_R_tab = R_tab;
200 qdisc_put_rtab(police->tcfp_P_tab);
201 police->tcfp_P_tab = P_tab;
204 if (tb[TCA_POLICE_RESULT])
205 police->tcfp_result = *(u32*)nla_data(tb[TCA_POLICE_RESULT]);
206 police->tcfp_toks = police->tcfp_burst = parm->burst;
207 police->tcfp_mtu = parm->mtu;
208 if (police->tcfp_mtu == 0) {
209 police->tcfp_mtu = ~0;
210 if (police->tcfp_R_tab)
211 police->tcfp_mtu = 255<<police->tcfp_R_tab->rate.cell_log;
213 if (police->tcfp_P_tab)
214 police->tcfp_ptoks = L2T_P(police, police->tcfp_mtu);
215 police->tcf_action = parm->action;
217 if (tb[TCA_POLICE_AVRATE])
218 police->tcfp_ewma_rate =
219 *(u32*)nla_data(tb[TCA_POLICE_AVRATE]);
221 gen_replace_estimator(&police->tcf_bstats,
222 &police->tcf_rate_est,
223 &police->tcf_lock, est);
225 spin_unlock_bh(&police->tcf_lock);
226 if (ret != ACT_P_CREATED)
229 police->tcfp_t_c = psched_get_time();
230 police->tcf_index = parm->index ? parm->index :
231 tcf_hash_new_index(&police_idx_gen, &police_hash_info);
232 h = tcf_hash(police->tcf_index, POL_TAB_MASK);
233 write_lock_bh(&police_lock);
234 police->tcf_next = tcf_police_ht[h];
235 tcf_police_ht[h] = &police->common;
236 write_unlock_bh(&police_lock);
242 if (ret == ACT_P_CREATED)
247 static int tcf_act_police_cleanup(struct tc_action *a, int bind)
249 struct tcf_police *p = a->priv;
257 if (p->tcf_refcnt <= 0 && !p->tcf_bindcnt) {
258 tcf_police_destroy(p);
265 static int tcf_act_police(struct sk_buff *skb, struct tc_action *a,
266 struct tcf_result *res)
268 struct tcf_police *police = a->priv;
273 spin_lock(&police->tcf_lock);
275 police->tcf_bstats.bytes += skb->len;
276 police->tcf_bstats.packets++;
278 if (police->tcfp_ewma_rate &&
279 police->tcf_rate_est.bps >= police->tcfp_ewma_rate) {
280 police->tcf_qstats.overlimits++;
281 spin_unlock(&police->tcf_lock);
282 return police->tcf_action;
285 if (skb->len <= police->tcfp_mtu) {
286 if (police->tcfp_R_tab == NULL) {
287 spin_unlock(&police->tcf_lock);
288 return police->tcfp_result;
291 now = psched_get_time();
292 toks = psched_tdiff_bounded(now, police->tcfp_t_c,
294 if (police->tcfp_P_tab) {
295 ptoks = toks + police->tcfp_ptoks;
296 if (ptoks > (long)L2T_P(police, police->tcfp_mtu))
297 ptoks = (long)L2T_P(police, police->tcfp_mtu);
298 ptoks -= L2T_P(police, skb->len);
300 toks += police->tcfp_toks;
301 if (toks > (long)police->tcfp_burst)
302 toks = police->tcfp_burst;
303 toks -= L2T(police, skb->len);
304 if ((toks|ptoks) >= 0) {
305 police->tcfp_t_c = now;
306 police->tcfp_toks = toks;
307 police->tcfp_ptoks = ptoks;
308 spin_unlock(&police->tcf_lock);
309 return police->tcfp_result;
313 police->tcf_qstats.overlimits++;
314 spin_unlock(&police->tcf_lock);
315 return police->tcf_action;
319 tcf_act_police_dump(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
321 unsigned char *b = skb_tail_pointer(skb);
322 struct tcf_police *police = a->priv;
323 struct tc_police opt;
325 opt.index = police->tcf_index;
326 opt.action = police->tcf_action;
327 opt.mtu = police->tcfp_mtu;
328 opt.burst = police->tcfp_burst;
329 opt.refcnt = police->tcf_refcnt - ref;
330 opt.bindcnt = police->tcf_bindcnt - bind;
331 if (police->tcfp_R_tab)
332 opt.rate = police->tcfp_R_tab->rate;
334 memset(&opt.rate, 0, sizeof(opt.rate));
335 if (police->tcfp_P_tab)
336 opt.peakrate = police->tcfp_P_tab->rate;
338 memset(&opt.peakrate, 0, sizeof(opt.peakrate));
339 NLA_PUT(skb, TCA_POLICE_TBF, sizeof(opt), &opt);
340 if (police->tcfp_result)
341 NLA_PUT(skb, TCA_POLICE_RESULT, sizeof(int),
342 &police->tcfp_result);
343 if (police->tcfp_ewma_rate)
344 NLA_PUT(skb, TCA_POLICE_AVRATE, 4, &police->tcfp_ewma_rate);
352 MODULE_AUTHOR("Alexey Kuznetsov");
353 MODULE_DESCRIPTION("Policing actions");
354 MODULE_LICENSE("GPL");
356 static struct tc_action_ops act_police_ops = {
358 .hinfo = &police_hash_info,
359 .type = TCA_ID_POLICE,
360 .capab = TCA_CAP_NONE,
361 .owner = THIS_MODULE,
362 .act = tcf_act_police,
363 .dump = tcf_act_police_dump,
364 .cleanup = tcf_act_police_cleanup,
365 .lookup = tcf_hash_search,
366 .init = tcf_act_police_locate,
367 .walk = tcf_act_police_walker
371 police_init_module(void)
373 return tcf_register_action(&act_police_ops);
377 police_cleanup_module(void)
379 tcf_unregister_action(&act_police_ops);
382 module_init(police_init_module);
383 module_exit(police_cleanup_module);