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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 | #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 |
29 | static struct tcf_common *tcf_police_ht[POL_TAB_MASK + 1]; |
30 | static u32 police_idx_gen; |
31 | static DEFINE_RWLOCK(police_lock); |
32 | |
33 | static 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 */ |
40 | struct tc_police_compat |
41 | { |
42 | u32 index; |
43 | int action; |
44 | u32 limit; |
45 | u32 burst; |
46 | u32 mtu; |
47 | struct tc_ratespec rate; |
48 | struct tc_ratespec peakrate; |
49 | }; |
50 | |
51 | /* Each policer is serialized by its individual spinlock */ |
52 | |
53 | static int tcf_act_police_walker(struct sk_buff *skb, struct netlink_callback *cb, |
54 | int type, struct tc_action *a) |
55 | { |
56 | struct tcf_common *p; |
57 | int err = 0, index = -1, i = 0, s_i = 0, n_i = 0; |
58 | struct nlattr *nest; |
59 | |
60 | read_lock_bh(&police_lock); |
61 | |
62 | s_i = cb->args[0]; |
63 | |
64 | for (i = 0; i < (POL_TAB_MASK + 1); i++) { |
65 | p = tcf_police_ht[tcf_hash(i, POL_TAB_MASK)]; |
66 | |
67 | for (; p; p = p->tcfc_next) { |
68 | index++; |
69 | if (index < s_i) |
70 | continue; |
71 | a->priv = p; |
72 | a->order = index; |
73 | nest = nla_nest_start(skb, a->order); |
74 | if (nest == NULL) |
75 | goto nla_put_failure; |
76 | if (type == RTM_DELACTION) |
77 | err = tcf_action_dump_1(skb, a, 0, 1); |
78 | else |
79 | err = tcf_action_dump_1(skb, a, 0, 0); |
80 | if (err < 0) { |
81 | index--; |
82 | nla_nest_cancel(skb, nest); |
83 | goto done; |
84 | } |
85 | nla_nest_end(skb, nest); |
86 | n_i++; |
87 | } |
88 | } |
89 | done: |
90 | read_unlock_bh(&police_lock); |
91 | if (n_i) |
92 | cb->args[0] += n_i; |
93 | return n_i; |
94 | |
95 | nla_put_failure: |
96 | nla_nest_cancel(skb, nest); |
97 | goto done; |
98 | } |
99 | |
100 | static void tcf_police_free_rcu(struct rcu_head *head) |
101 | { |
102 | kfree(container_of(head, struct tcf_police, tcf_rcu)); |
103 | } |
104 | |
105 | static void tcf_police_destroy(struct tcf_police *p) |
106 | { |
107 | unsigned int h = tcf_hash(p->tcf_index, POL_TAB_MASK); |
108 | struct tcf_common **p1p; |
109 | |
110 | for (p1p = &tcf_police_ht[h]; *p1p; p1p = &(*p1p)->tcfc_next) { |
111 | if (*p1p == &p->common) { |
112 | write_lock_bh(&police_lock); |
113 | *p1p = p->tcf_next; |
114 | write_unlock_bh(&police_lock); |
115 | gen_kill_estimator(&p->tcf_bstats, |
116 | &p->tcf_rate_est); |
117 | if (p->tcfp_R_tab) |
118 | qdisc_put_rtab(p->tcfp_R_tab); |
119 | if (p->tcfp_P_tab) |
120 | qdisc_put_rtab(p->tcfp_P_tab); |
121 | /* |
122 | * gen_estimator est_timer() might access p->tcf_lock |
123 | * or bstats, wait a RCU grace period before freeing p |
124 | */ |
125 | call_rcu(&p->tcf_rcu, tcf_police_free_rcu); |
126 | return; |
127 | } |
128 | } |
129 | WARN_ON(1); |
130 | } |
131 | |
132 | static const struct nla_policy police_policy[TCA_POLICE_MAX + 1] = { |
133 | [TCA_POLICE_RATE] = { .len = TC_RTAB_SIZE }, |
134 | [TCA_POLICE_PEAKRATE] = { .len = TC_RTAB_SIZE }, |
135 | [TCA_POLICE_AVRATE] = { .type = NLA_U32 }, |
136 | [TCA_POLICE_RESULT] = { .type = NLA_U32 }, |
137 | }; |
138 | |
139 | static int tcf_act_police_locate(struct nlattr *nla, struct nlattr *est, |
140 | struct tc_action *a, int ovr, int bind) |
141 | { |
142 | unsigned h; |
143 | int ret = 0, err; |
144 | struct nlattr *tb[TCA_POLICE_MAX + 1]; |
145 | struct tc_police *parm; |
146 | struct tcf_police *police; |
147 | struct qdisc_rate_table *R_tab = NULL, *P_tab = NULL; |
148 | int size; |
149 | |
150 | if (nla == NULL) |
151 | return -EINVAL; |
152 | |
153 | err = nla_parse_nested(tb, TCA_POLICE_MAX, nla, police_policy); |
154 | if (err < 0) |
155 | return err; |
156 | |
157 | if (tb[TCA_POLICE_TBF] == NULL) |
158 | return -EINVAL; |
159 | size = nla_len(tb[TCA_POLICE_TBF]); |
160 | if (size != sizeof(*parm) && size != sizeof(struct tc_police_compat)) |
161 | return -EINVAL; |
162 | parm = nla_data(tb[TCA_POLICE_TBF]); |
163 | |
164 | if (parm->index) { |
165 | struct tcf_common *pc; |
166 | |
167 | pc = tcf_hash_lookup(parm->index, &police_hash_info); |
168 | if (pc != NULL) { |
169 | a->priv = pc; |
170 | police = to_police(pc); |
171 | if (bind) { |
172 | police->tcf_bindcnt += 1; |
173 | police->tcf_refcnt += 1; |
174 | } |
175 | if (ovr) |
176 | goto override; |
177 | return ret; |
178 | } |
179 | } |
180 | |
181 | police = kzalloc(sizeof(*police), GFP_KERNEL); |
182 | if (police == NULL) |
183 | return -ENOMEM; |
184 | ret = ACT_P_CREATED; |
185 | police->tcf_refcnt = 1; |
186 | spin_lock_init(&police->tcf_lock); |
187 | if (bind) |
188 | police->tcf_bindcnt = 1; |
189 | override: |
190 | if (parm->rate.rate) { |
191 | err = -ENOMEM; |
192 | R_tab = qdisc_get_rtab(&parm->rate, tb[TCA_POLICE_RATE]); |
193 | if (R_tab == NULL) |
194 | goto failure; |
195 | |
196 | if (parm->peakrate.rate) { |
197 | P_tab = qdisc_get_rtab(&parm->peakrate, |
198 | tb[TCA_POLICE_PEAKRATE]); |
199 | if (P_tab == NULL) |
200 | goto failure; |
201 | } |
202 | } |
203 | |
204 | spin_lock_bh(&police->tcf_lock); |
205 | if (est) { |
206 | err = gen_replace_estimator(&police->tcf_bstats, |
207 | &police->tcf_rate_est, |
208 | &police->tcf_lock, est); |
209 | if (err) |
210 | goto failure_unlock; |
211 | } else if (tb[TCA_POLICE_AVRATE] && |
212 | (ret == ACT_P_CREATED || |
213 | !gen_estimator_active(&police->tcf_bstats, |
214 | &police->tcf_rate_est))) { |
215 | err = -EINVAL; |
216 | goto failure_unlock; |
217 | } |
218 | |
219 | /* No failure allowed after this point */ |
220 | if (R_tab != NULL) { |
221 | qdisc_put_rtab(police->tcfp_R_tab); |
222 | police->tcfp_R_tab = R_tab; |
223 | } |
224 | if (P_tab != NULL) { |
225 | qdisc_put_rtab(police->tcfp_P_tab); |
226 | police->tcfp_P_tab = P_tab; |
227 | } |
228 | |
229 | if (tb[TCA_POLICE_RESULT]) |
230 | police->tcfp_result = nla_get_u32(tb[TCA_POLICE_RESULT]); |
231 | police->tcfp_toks = police->tcfp_burst = parm->burst; |
232 | police->tcfp_mtu = parm->mtu; |
233 | if (police->tcfp_mtu == 0) { |
234 | police->tcfp_mtu = ~0; |
235 | if (police->tcfp_R_tab) |
236 | police->tcfp_mtu = 255<<police->tcfp_R_tab->rate.cell_log; |
237 | } |
238 | if (police->tcfp_P_tab) |
239 | police->tcfp_ptoks = L2T_P(police, police->tcfp_mtu); |
240 | police->tcf_action = parm->action; |
241 | |
242 | if (tb[TCA_POLICE_AVRATE]) |
243 | police->tcfp_ewma_rate = nla_get_u32(tb[TCA_POLICE_AVRATE]); |
244 | |
245 | spin_unlock_bh(&police->tcf_lock); |
246 | if (ret != ACT_P_CREATED) |
247 | return ret; |
248 | |
249 | police->tcfp_t_c = psched_get_time(); |
250 | police->tcf_index = parm->index ? parm->index : |
251 | tcf_hash_new_index(&police_idx_gen, &police_hash_info); |
252 | h = tcf_hash(police->tcf_index, POL_TAB_MASK); |
253 | write_lock_bh(&police_lock); |
254 | police->tcf_next = tcf_police_ht[h]; |
255 | tcf_police_ht[h] = &police->common; |
256 | write_unlock_bh(&police_lock); |
257 | |
258 | a->priv = police; |
259 | return ret; |
260 | |
261 | failure_unlock: |
262 | spin_unlock_bh(&police->tcf_lock); |
263 | failure: |
264 | if (P_tab) |
265 | qdisc_put_rtab(P_tab); |
266 | if (R_tab) |
267 | qdisc_put_rtab(R_tab); |
268 | if (ret == ACT_P_CREATED) |
269 | kfree(police); |
270 | return err; |
271 | } |
272 | |
273 | static int tcf_act_police_cleanup(struct tc_action *a, int bind) |
274 | { |
275 | struct tcf_police *p = a->priv; |
276 | int ret = 0; |
277 | |
278 | if (p != NULL) { |
279 | if (bind) |
280 | p->tcf_bindcnt--; |
281 | |
282 | p->tcf_refcnt--; |
283 | if (p->tcf_refcnt <= 0 && !p->tcf_bindcnt) { |
284 | tcf_police_destroy(p); |
285 | ret = 1; |
286 | } |
287 | } |
288 | return ret; |
289 | } |
290 | |
291 | static int tcf_act_police(struct sk_buff *skb, struct tc_action *a, |
292 | struct tcf_result *res) |
293 | { |
294 | struct tcf_police *police = a->priv; |
295 | psched_time_t now; |
296 | long toks; |
297 | long ptoks = 0; |
298 | |
299 | spin_lock(&police->tcf_lock); |
300 | |
301 | police->tcf_bstats.bytes += qdisc_pkt_len(skb); |
302 | police->tcf_bstats.packets++; |
303 | |
304 | if (police->tcfp_ewma_rate && |
305 | police->tcf_rate_est.bps >= police->tcfp_ewma_rate) { |
306 | police->tcf_qstats.overlimits++; |
307 | if (police->tcf_action == TC_ACT_SHOT) |
308 | police->tcf_qstats.drops++; |
309 | spin_unlock(&police->tcf_lock); |
310 | return police->tcf_action; |
311 | } |
312 | |
313 | if (qdisc_pkt_len(skb) <= police->tcfp_mtu) { |
314 | if (police->tcfp_R_tab == NULL) { |
315 | spin_unlock(&police->tcf_lock); |
316 | return police->tcfp_result; |
317 | } |
318 | |
319 | now = psched_get_time(); |
320 | toks = psched_tdiff_bounded(now, police->tcfp_t_c, |
321 | police->tcfp_burst); |
322 | if (police->tcfp_P_tab) { |
323 | ptoks = toks + police->tcfp_ptoks; |
324 | if (ptoks > (long)L2T_P(police, police->tcfp_mtu)) |
325 | ptoks = (long)L2T_P(police, police->tcfp_mtu); |
326 | ptoks -= L2T_P(police, qdisc_pkt_len(skb)); |
327 | } |
328 | toks += police->tcfp_toks; |
329 | if (toks > (long)police->tcfp_burst) |
330 | toks = police->tcfp_burst; |
331 | toks -= L2T(police, qdisc_pkt_len(skb)); |
332 | if ((toks|ptoks) >= 0) { |
333 | police->tcfp_t_c = now; |
334 | police->tcfp_toks = toks; |
335 | police->tcfp_ptoks = ptoks; |
336 | spin_unlock(&police->tcf_lock); |
337 | return police->tcfp_result; |
338 | } |
339 | } |
340 | |
341 | police->tcf_qstats.overlimits++; |
342 | if (police->tcf_action == TC_ACT_SHOT) |
343 | police->tcf_qstats.drops++; |
344 | spin_unlock(&police->tcf_lock); |
345 | return police->tcf_action; |
346 | } |
347 | |
348 | static int |
349 | tcf_act_police_dump(struct sk_buff *skb, struct tc_action *a, int bind, int ref) |
350 | { |
351 | unsigned char *b = skb_tail_pointer(skb); |
352 | struct tcf_police *police = a->priv; |
353 | struct tc_police opt = { |
354 | .index = police->tcf_index, |
355 | .action = police->tcf_action, |
356 | .mtu = police->tcfp_mtu, |
357 | .burst = police->tcfp_burst, |
358 | .refcnt = police->tcf_refcnt - ref, |
359 | .bindcnt = police->tcf_bindcnt - bind, |
360 | }; |
361 | |
362 | if (police->tcfp_R_tab) |
363 | opt.rate = police->tcfp_R_tab->rate; |
364 | if (police->tcfp_P_tab) |
365 | opt.peakrate = police->tcfp_P_tab->rate; |
366 | NLA_PUT(skb, TCA_POLICE_TBF, sizeof(opt), &opt); |
367 | if (police->tcfp_result) |
368 | NLA_PUT_U32(skb, TCA_POLICE_RESULT, police->tcfp_result); |
369 | if (police->tcfp_ewma_rate) |
370 | NLA_PUT_U32(skb, TCA_POLICE_AVRATE, police->tcfp_ewma_rate); |
371 | return skb->len; |
372 | |
373 | nla_put_failure: |
374 | nlmsg_trim(skb, b); |
375 | return -1; |
376 | } |
377 | |
378 | MODULE_AUTHOR("Alexey Kuznetsov"); |
379 | MODULE_DESCRIPTION("Policing actions"); |
380 | MODULE_LICENSE("GPL"); |
381 | |
382 | static struct tc_action_ops act_police_ops = { |
383 | .kind = "police", |
384 | .hinfo = &police_hash_info, |
385 | .type = TCA_ID_POLICE, |
386 | .capab = TCA_CAP_NONE, |
387 | .owner = THIS_MODULE, |
388 | .act = tcf_act_police, |
389 | .dump = tcf_act_police_dump, |
390 | .cleanup = tcf_act_police_cleanup, |
391 | .lookup = tcf_hash_search, |
392 | .init = tcf_act_police_locate, |
393 | .walk = tcf_act_police_walker |
394 | }; |
395 | |
396 | static int __init |
397 | police_init_module(void) |
398 | { |
399 | return tcf_register_action(&act_police_ops); |
400 | } |
401 | |
402 | static void __exit |
403 | police_cleanup_module(void) |
404 | { |
405 | tcf_unregister_action(&act_police_ops); |
406 | rcu_barrier(); /* Wait for completion of call_rcu()'s (tcf_police_free_rcu) */ |
407 | } |
408 | |
409 | module_init(police_init_module); |
410 | module_exit(police_cleanup_module); |
411 |
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