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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 | struct tcf_police { |
26 | struct tcf_common common; |
27 | int tcfp_result; |
28 | u32 tcfp_ewma_rate; |
29 | s64 tcfp_burst; |
30 | u32 tcfp_mtu; |
31 | s64 tcfp_toks; |
32 | s64 tcfp_ptoks; |
33 | s64 tcfp_mtu_ptoks; |
34 | s64 tcfp_t_c; |
35 | struct psched_ratecfg rate; |
36 | bool rate_present; |
37 | struct psched_ratecfg peak; |
38 | bool peak_present; |
39 | }; |
40 | #define to_police(pc) \ |
41 | container_of(pc, struct tcf_police, common) |
42 | |
43 | #define POL_TAB_MASK 15 |
44 | static struct tcf_common *tcf_police_ht[POL_TAB_MASK + 1]; |
45 | static u32 police_idx_gen; |
46 | static DEFINE_RWLOCK(police_lock); |
47 | |
48 | static struct tcf_hashinfo police_hash_info = { |
49 | .htab = tcf_police_ht, |
50 | .hmask = POL_TAB_MASK, |
51 | .lock = &police_lock, |
52 | }; |
53 | |
54 | /* old policer structure from before tc actions */ |
55 | struct tc_police_compat { |
56 | u32 index; |
57 | int action; |
58 | u32 limit; |
59 | u32 burst; |
60 | u32 mtu; |
61 | struct tc_ratespec rate; |
62 | struct tc_ratespec peakrate; |
63 | }; |
64 | |
65 | /* Each policer is serialized by its individual spinlock */ |
66 | |
67 | static int tcf_act_police_walker(struct sk_buff *skb, struct netlink_callback *cb, |
68 | int type, struct tc_action *a) |
69 | { |
70 | struct tcf_common *p; |
71 | int err = 0, index = -1, i = 0, s_i = 0, n_i = 0; |
72 | struct nlattr *nest; |
73 | |
74 | read_lock_bh(&police_lock); |
75 | |
76 | s_i = cb->args[0]; |
77 | |
78 | for (i = 0; i < (POL_TAB_MASK + 1); i++) { |
79 | p = tcf_police_ht[tcf_hash(i, POL_TAB_MASK)]; |
80 | |
81 | for (; p; p = p->tcfc_next) { |
82 | index++; |
83 | if (index < s_i) |
84 | continue; |
85 | a->priv = p; |
86 | a->order = index; |
87 | nest = nla_nest_start(skb, a->order); |
88 | if (nest == NULL) |
89 | goto nla_put_failure; |
90 | if (type == RTM_DELACTION) |
91 | err = tcf_action_dump_1(skb, a, 0, 1); |
92 | else |
93 | err = tcf_action_dump_1(skb, a, 0, 0); |
94 | if (err < 0) { |
95 | index--; |
96 | nla_nest_cancel(skb, nest); |
97 | goto done; |
98 | } |
99 | nla_nest_end(skb, nest); |
100 | n_i++; |
101 | } |
102 | } |
103 | done: |
104 | read_unlock_bh(&police_lock); |
105 | if (n_i) |
106 | cb->args[0] += n_i; |
107 | return n_i; |
108 | |
109 | nla_put_failure: |
110 | nla_nest_cancel(skb, nest); |
111 | goto done; |
112 | } |
113 | |
114 | static void tcf_police_destroy(struct tcf_police *p) |
115 | { |
116 | unsigned int h = tcf_hash(p->tcf_index, POL_TAB_MASK); |
117 | struct tcf_common **p1p; |
118 | |
119 | for (p1p = &tcf_police_ht[h]; *p1p; p1p = &(*p1p)->tcfc_next) { |
120 | if (*p1p == &p->common) { |
121 | write_lock_bh(&police_lock); |
122 | *p1p = p->tcf_next; |
123 | write_unlock_bh(&police_lock); |
124 | gen_kill_estimator(&p->tcf_bstats, |
125 | &p->tcf_rate_est); |
126 | /* |
127 | * gen_estimator est_timer() might access p->tcf_lock |
128 | * or bstats, wait a RCU grace period before freeing p |
129 | */ |
130 | kfree_rcu(p, tcf_rcu); |
131 | return; |
132 | } |
133 | } |
134 | WARN_ON(1); |
135 | } |
136 | |
137 | static const struct nla_policy police_policy[TCA_POLICE_MAX + 1] = { |
138 | [TCA_POLICE_RATE] = { .len = TC_RTAB_SIZE }, |
139 | [TCA_POLICE_PEAKRATE] = { .len = TC_RTAB_SIZE }, |
140 | [TCA_POLICE_AVRATE] = { .type = NLA_U32 }, |
141 | [TCA_POLICE_RESULT] = { .type = NLA_U32 }, |
142 | }; |
143 | |
144 | static int tcf_act_police_locate(struct net *net, struct nlattr *nla, |
145 | struct nlattr *est, struct tc_action *a, |
146 | int ovr, int bind) |
147 | { |
148 | unsigned int h; |
149 | int ret = 0, err; |
150 | struct nlattr *tb[TCA_POLICE_MAX + 1]; |
151 | struct tc_police *parm; |
152 | struct tcf_police *police; |
153 | struct qdisc_rate_table *R_tab = NULL, *P_tab = NULL; |
154 | int size; |
155 | |
156 | if (nla == NULL) |
157 | return -EINVAL; |
158 | |
159 | err = nla_parse_nested(tb, TCA_POLICE_MAX, nla, police_policy); |
160 | if (err < 0) |
161 | return err; |
162 | |
163 | if (tb[TCA_POLICE_TBF] == NULL) |
164 | return -EINVAL; |
165 | size = nla_len(tb[TCA_POLICE_TBF]); |
166 | if (size != sizeof(*parm) && size != sizeof(struct tc_police_compat)) |
167 | return -EINVAL; |
168 | parm = nla_data(tb[TCA_POLICE_TBF]); |
169 | |
170 | if (parm->index) { |
171 | struct tcf_common *pc; |
172 | |
173 | pc = tcf_hash_lookup(parm->index, &police_hash_info); |
174 | if (pc != NULL) { |
175 | a->priv = pc; |
176 | police = to_police(pc); |
177 | if (bind) { |
178 | police->tcf_bindcnt += 1; |
179 | police->tcf_refcnt += 1; |
180 | } |
181 | if (ovr) |
182 | goto override; |
183 | return ret; |
184 | } |
185 | } |
186 | |
187 | police = kzalloc(sizeof(*police), GFP_KERNEL); |
188 | if (police == NULL) |
189 | return -ENOMEM; |
190 | ret = ACT_P_CREATED; |
191 | police->tcf_refcnt = 1; |
192 | spin_lock_init(&police->tcf_lock); |
193 | if (bind) |
194 | police->tcf_bindcnt = 1; |
195 | override: |
196 | if (parm->rate.rate) { |
197 | err = -ENOMEM; |
198 | R_tab = qdisc_get_rtab(&parm->rate, tb[TCA_POLICE_RATE]); |
199 | if (R_tab == NULL) |
200 | goto failure; |
201 | |
202 | if (parm->peakrate.rate) { |
203 | P_tab = qdisc_get_rtab(&parm->peakrate, |
204 | tb[TCA_POLICE_PEAKRATE]); |
205 | if (P_tab == NULL) |
206 | goto failure; |
207 | } |
208 | } |
209 | |
210 | spin_lock_bh(&police->tcf_lock); |
211 | if (est) { |
212 | err = gen_replace_estimator(&police->tcf_bstats, |
213 | &police->tcf_rate_est, |
214 | &police->tcf_lock, est); |
215 | if (err) |
216 | goto failure_unlock; |
217 | } else if (tb[TCA_POLICE_AVRATE] && |
218 | (ret == ACT_P_CREATED || |
219 | !gen_estimator_active(&police->tcf_bstats, |
220 | &police->tcf_rate_est))) { |
221 | err = -EINVAL; |
222 | goto failure_unlock; |
223 | } |
224 | |
225 | /* No failure allowed after this point */ |
226 | police->tcfp_mtu = parm->mtu; |
227 | if (police->tcfp_mtu == 0) { |
228 | police->tcfp_mtu = ~0; |
229 | if (R_tab) |
230 | police->tcfp_mtu = 255 << R_tab->rate.cell_log; |
231 | } |
232 | if (R_tab) { |
233 | police->rate_present = true; |
234 | psched_ratecfg_precompute(&police->rate, R_tab->rate.rate); |
235 | qdisc_put_rtab(R_tab); |
236 | } else { |
237 | police->rate_present = false; |
238 | } |
239 | if (P_tab) { |
240 | police->peak_present = true; |
241 | psched_ratecfg_precompute(&police->peak, P_tab->rate.rate); |
242 | qdisc_put_rtab(P_tab); |
243 | } else { |
244 | police->peak_present = false; |
245 | } |
246 | |
247 | if (tb[TCA_POLICE_RESULT]) |
248 | police->tcfp_result = nla_get_u32(tb[TCA_POLICE_RESULT]); |
249 | police->tcfp_burst = PSCHED_TICKS2NS(parm->burst); |
250 | police->tcfp_toks = police->tcfp_burst; |
251 | if (police->peak_present) { |
252 | police->tcfp_mtu_ptoks = (s64) psched_l2t_ns(&police->peak, |
253 | police->tcfp_mtu); |
254 | police->tcfp_ptoks = police->tcfp_mtu_ptoks; |
255 | } |
256 | police->tcf_action = parm->action; |
257 | |
258 | if (tb[TCA_POLICE_AVRATE]) |
259 | police->tcfp_ewma_rate = nla_get_u32(tb[TCA_POLICE_AVRATE]); |
260 | |
261 | spin_unlock_bh(&police->tcf_lock); |
262 | if (ret != ACT_P_CREATED) |
263 | return ret; |
264 | |
265 | police->tcfp_t_c = ktime_to_ns(ktime_get()); |
266 | police->tcf_index = parm->index ? parm->index : |
267 | tcf_hash_new_index(&police_idx_gen, &police_hash_info); |
268 | h = tcf_hash(police->tcf_index, POL_TAB_MASK); |
269 | write_lock_bh(&police_lock); |
270 | police->tcf_next = tcf_police_ht[h]; |
271 | tcf_police_ht[h] = &police->common; |
272 | write_unlock_bh(&police_lock); |
273 | |
274 | a->priv = police; |
275 | return ret; |
276 | |
277 | failure_unlock: |
278 | spin_unlock_bh(&police->tcf_lock); |
279 | failure: |
280 | if (P_tab) |
281 | qdisc_put_rtab(P_tab); |
282 | if (R_tab) |
283 | qdisc_put_rtab(R_tab); |
284 | if (ret == ACT_P_CREATED) |
285 | kfree(police); |
286 | return err; |
287 | } |
288 | |
289 | static int tcf_act_police_cleanup(struct tc_action *a, int bind) |
290 | { |
291 | struct tcf_police *p = a->priv; |
292 | int ret = 0; |
293 | |
294 | if (p != NULL) { |
295 | if (bind) |
296 | p->tcf_bindcnt--; |
297 | |
298 | p->tcf_refcnt--; |
299 | if (p->tcf_refcnt <= 0 && !p->tcf_bindcnt) { |
300 | tcf_police_destroy(p); |
301 | ret = 1; |
302 | } |
303 | } |
304 | return ret; |
305 | } |
306 | |
307 | static int tcf_act_police(struct sk_buff *skb, const struct tc_action *a, |
308 | struct tcf_result *res) |
309 | { |
310 | struct tcf_police *police = a->priv; |
311 | s64 now; |
312 | s64 toks; |
313 | s64 ptoks = 0; |
314 | |
315 | spin_lock(&police->tcf_lock); |
316 | |
317 | bstats_update(&police->tcf_bstats, skb); |
318 | |
319 | if (police->tcfp_ewma_rate && |
320 | police->tcf_rate_est.bps >= police->tcfp_ewma_rate) { |
321 | police->tcf_qstats.overlimits++; |
322 | if (police->tcf_action == TC_ACT_SHOT) |
323 | police->tcf_qstats.drops++; |
324 | spin_unlock(&police->tcf_lock); |
325 | return police->tcf_action; |
326 | } |
327 | |
328 | if (qdisc_pkt_len(skb) <= police->tcfp_mtu) { |
329 | if (!police->rate_present) { |
330 | spin_unlock(&police->tcf_lock); |
331 | return police->tcfp_result; |
332 | } |
333 | |
334 | now = ktime_to_ns(ktime_get()); |
335 | toks = min_t(s64, now - police->tcfp_t_c, |
336 | police->tcfp_burst); |
337 | if (police->peak_present) { |
338 | ptoks = toks + police->tcfp_ptoks; |
339 | if (ptoks > police->tcfp_mtu_ptoks) |
340 | ptoks = police->tcfp_mtu_ptoks; |
341 | ptoks -= (s64) psched_l2t_ns(&police->peak, |
342 | qdisc_pkt_len(skb)); |
343 | } |
344 | toks += police->tcfp_toks; |
345 | if (toks > police->tcfp_burst) |
346 | toks = police->tcfp_burst; |
347 | toks -= (s64) psched_l2t_ns(&police->rate, qdisc_pkt_len(skb)); |
348 | if ((toks|ptoks) >= 0) { |
349 | police->tcfp_t_c = now; |
350 | police->tcfp_toks = toks; |
351 | police->tcfp_ptoks = ptoks; |
352 | spin_unlock(&police->tcf_lock); |
353 | return police->tcfp_result; |
354 | } |
355 | } |
356 | |
357 | police->tcf_qstats.overlimits++; |
358 | if (police->tcf_action == TC_ACT_SHOT) |
359 | police->tcf_qstats.drops++; |
360 | spin_unlock(&police->tcf_lock); |
361 | return police->tcf_action; |
362 | } |
363 | |
364 | static int |
365 | tcf_act_police_dump(struct sk_buff *skb, struct tc_action *a, int bind, int ref) |
366 | { |
367 | unsigned char *b = skb_tail_pointer(skb); |
368 | struct tcf_police *police = a->priv; |
369 | struct tc_police opt = { |
370 | .index = police->tcf_index, |
371 | .action = police->tcf_action, |
372 | .mtu = police->tcfp_mtu, |
373 | .burst = PSCHED_NS2TICKS(police->tcfp_burst), |
374 | .refcnt = police->tcf_refcnt - ref, |
375 | .bindcnt = police->tcf_bindcnt - bind, |
376 | }; |
377 | |
378 | if (police->rate_present) |
379 | opt.rate.rate = psched_ratecfg_getrate(&police->rate); |
380 | if (police->peak_present) |
381 | opt.peakrate.rate = psched_ratecfg_getrate(&police->peak); |
382 | if (nla_put(skb, TCA_POLICE_TBF, sizeof(opt), &opt)) |
383 | goto nla_put_failure; |
384 | if (police->tcfp_result && |
385 | nla_put_u32(skb, TCA_POLICE_RESULT, police->tcfp_result)) |
386 | goto nla_put_failure; |
387 | if (police->tcfp_ewma_rate && |
388 | nla_put_u32(skb, TCA_POLICE_AVRATE, police->tcfp_ewma_rate)) |
389 | goto nla_put_failure; |
390 | return skb->len; |
391 | |
392 | nla_put_failure: |
393 | nlmsg_trim(skb, b); |
394 | return -1; |
395 | } |
396 | |
397 | MODULE_AUTHOR("Alexey Kuznetsov"); |
398 | MODULE_DESCRIPTION("Policing actions"); |
399 | MODULE_LICENSE("GPL"); |
400 | |
401 | static struct tc_action_ops act_police_ops = { |
402 | .kind = "police", |
403 | .hinfo = &police_hash_info, |
404 | .type = TCA_ID_POLICE, |
405 | .capab = TCA_CAP_NONE, |
406 | .owner = THIS_MODULE, |
407 | .act = tcf_act_police, |
408 | .dump = tcf_act_police_dump, |
409 | .cleanup = tcf_act_police_cleanup, |
410 | .lookup = tcf_hash_search, |
411 | .init = tcf_act_police_locate, |
412 | .walk = tcf_act_police_walker |
413 | }; |
414 | |
415 | static int __init |
416 | police_init_module(void) |
417 | { |
418 | return tcf_register_action(&act_police_ops); |
419 | } |
420 | |
421 | static void __exit |
422 | police_cleanup_module(void) |
423 | { |
424 | tcf_unregister_action(&act_police_ops); |
425 | } |
426 | |
427 | module_init(police_init_module); |
428 | module_exit(police_cleanup_module); |
429 |
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