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Commit | Line | Data |
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1da177e4 LT |
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 | ||
1da177e4 LT |
13 | #include <linux/module.h> |
14 | #include <linux/types.h> | |
15 | #include <linux/kernel.h> | |
1da177e4 | 16 | #include <linux/string.h> |
1da177e4 | 17 | #include <linux/errno.h> |
1da177e4 | 18 | #include <linux/skbuff.h> |
1da177e4 LT |
19 | #include <linux/rtnetlink.h> |
20 | #include <linux/init.h> | |
5a0e3ad6 | 21 | #include <linux/slab.h> |
1da177e4 | 22 | #include <net/act_api.h> |
dc5fc579 | 23 | #include <net/netlink.h> |
1da177e4 | 24 | |
e9bef55d JDB |
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) | |
1da177e4 | 27 | |
e9ce1cd3 DM |
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); | |
1da177e4 | 32 | |
e9ce1cd3 DM |
33 | static struct tcf_hashinfo police_hash_info = { |
34 | .htab = tcf_police_ht, | |
35 | .hmask = POL_TAB_MASK, | |
36 | .lock = &police_lock, | |
37 | }; | |
1da177e4 | 38 | |
1e9b3d53 PM |
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 | ||
e9ce1cd3 | 51 | /* Each policer is serialized by its individual spinlock */ |
1da177e4 | 52 | |
83b950c8 | 53 | static int tcf_act_police_walker(struct sk_buff *skb, struct netlink_callback *cb, |
10297b99 | 54 | int type, struct tc_action *a) |
1da177e4 | 55 | { |
e9ce1cd3 | 56 | struct tcf_common *p; |
1da177e4 | 57 | int err = 0, index = -1, i = 0, s_i = 0, n_i = 0; |
4b3550ef | 58 | struct nlattr *nest; |
1da177e4 | 59 | |
e1e992e5 | 60 | read_lock_bh(&police_lock); |
1da177e4 LT |
61 | |
62 | s_i = cb->args[0]; | |
63 | ||
e9ce1cd3 DM |
64 | for (i = 0; i < (POL_TAB_MASK + 1); i++) { |
65 | p = tcf_police_ht[tcf_hash(i, POL_TAB_MASK)]; | |
1da177e4 | 66 | |
e9ce1cd3 | 67 | for (; p; p = p->tcfc_next) { |
1da177e4 LT |
68 | index++; |
69 | if (index < s_i) | |
70 | continue; | |
71 | a->priv = p; | |
72 | a->order = index; | |
4b3550ef PM |
73 | nest = nla_nest_start(skb, a->order); |
74 | if (nest == NULL) | |
75 | goto nla_put_failure; | |
1da177e4 LT |
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--; | |
4b3550ef | 82 | nla_nest_cancel(skb, nest); |
1da177e4 LT |
83 | goto done; |
84 | } | |
4b3550ef | 85 | nla_nest_end(skb, nest); |
1da177e4 LT |
86 | n_i++; |
87 | } | |
88 | } | |
89 | done: | |
e1e992e5 | 90 | read_unlock_bh(&police_lock); |
1da177e4 LT |
91 | if (n_i) |
92 | cb->args[0] += n_i; | |
93 | return n_i; | |
94 | ||
7ba699c6 | 95 | nla_put_failure: |
4b3550ef | 96 | nla_nest_cancel(skb, nest); |
1da177e4 LT |
97 | goto done; |
98 | } | |
1da177e4 | 99 | |
c7de2cf0 ED |
100 | static void tcf_police_free_rcu(struct rcu_head *head) |
101 | { | |
102 | kfree(container_of(head, struct tcf_police, tcf_rcu)); | |
103 | } | |
104 | ||
c3bc7cff | 105 | static void tcf_police_destroy(struct tcf_police *p) |
1da177e4 | 106 | { |
e9ce1cd3 DM |
107 | unsigned int h = tcf_hash(p->tcf_index, POL_TAB_MASK); |
108 | struct tcf_common **p1p; | |
10297b99 | 109 | |
e9ce1cd3 DM |
110 | for (p1p = &tcf_police_ht[h]; *p1p; p1p = &(*p1p)->tcfc_next) { |
111 | if (*p1p == &p->common) { | |
1da177e4 | 112 | write_lock_bh(&police_lock); |
e9ce1cd3 | 113 | *p1p = p->tcf_next; |
1da177e4 | 114 | write_unlock_bh(&police_lock); |
e9ce1cd3 DM |
115 | gen_kill_estimator(&p->tcf_bstats, |
116 | &p->tcf_rate_est); | |
e9ce1cd3 DM |
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); | |
c7de2cf0 ED |
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); | |
1da177e4 LT |
126 | return; |
127 | } | |
128 | } | |
547b792c | 129 | WARN_ON(1); |
1da177e4 LT |
130 | } |
131 | ||
53b2bf3f PM |
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 | ||
7ba699c6 | 139 | static int tcf_act_police_locate(struct nlattr *nla, struct nlattr *est, |
10297b99 | 140 | struct tc_action *a, int ovr, int bind) |
1da177e4 LT |
141 | { |
142 | unsigned h; | |
143 | int ret = 0, err; | |
7ba699c6 | 144 | struct nlattr *tb[TCA_POLICE_MAX + 1]; |
1da177e4 | 145 | struct tc_police *parm; |
e9ce1cd3 | 146 | struct tcf_police *police; |
1da177e4 | 147 | struct qdisc_rate_table *R_tab = NULL, *P_tab = NULL; |
1e9b3d53 | 148 | int size; |
1da177e4 | 149 | |
cee63723 | 150 | if (nla == NULL) |
1da177e4 LT |
151 | return -EINVAL; |
152 | ||
53b2bf3f | 153 | err = nla_parse_nested(tb, TCA_POLICE_MAX, nla, police_policy); |
cee63723 PM |
154 | if (err < 0) |
155 | return err; | |
156 | ||
7ba699c6 | 157 | if (tb[TCA_POLICE_TBF] == NULL) |
1e9b3d53 | 158 | return -EINVAL; |
7ba699c6 | 159 | size = nla_len(tb[TCA_POLICE_TBF]); |
1e9b3d53 | 160 | if (size != sizeof(*parm) && size != sizeof(struct tc_police_compat)) |
1da177e4 | 161 | return -EINVAL; |
7ba699c6 | 162 | parm = nla_data(tb[TCA_POLICE_TBF]); |
1da177e4 | 163 | |
e9ce1cd3 DM |
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; | |
1da177e4 | 178 | } |
1da177e4 LT |
179 | } |
180 | ||
e9ce1cd3 DM |
181 | police = kzalloc(sizeof(*police), GFP_KERNEL); |
182 | if (police == NULL) | |
1da177e4 | 183 | return -ENOMEM; |
1da177e4 | 184 | ret = ACT_P_CREATED; |
e9ce1cd3 DM |
185 | police->tcf_refcnt = 1; |
186 | spin_lock_init(&police->tcf_lock); | |
1da177e4 | 187 | if (bind) |
e9ce1cd3 | 188 | police->tcf_bindcnt = 1; |
1da177e4 LT |
189 | override: |
190 | if (parm->rate.rate) { | |
191 | err = -ENOMEM; | |
7ba699c6 | 192 | R_tab = qdisc_get_rtab(&parm->rate, tb[TCA_POLICE_RATE]); |
1da177e4 LT |
193 | if (R_tab == NULL) |
194 | goto failure; | |
c1b56878 | 195 | |
1da177e4 LT |
196 | if (parm->peakrate.rate) { |
197 | P_tab = qdisc_get_rtab(&parm->peakrate, | |
7ba699c6 | 198 | tb[TCA_POLICE_PEAKRATE]); |
71bcb09a | 199 | if (P_tab == NULL) |
1da177e4 | 200 | goto failure; |
1da177e4 LT |
201 | } |
202 | } | |
71bcb09a | 203 | |
e9ce1cd3 | 204 | spin_lock_bh(&police->tcf_lock); |
71bcb09a SH |
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; | |
a883bf56 JP |
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; | |
71bcb09a SH |
217 | } |
218 | ||
219 | /* No failure allowed after this point */ | |
1da177e4 | 220 | if (R_tab != NULL) { |
e9ce1cd3 DM |
221 | qdisc_put_rtab(police->tcfp_R_tab); |
222 | police->tcfp_R_tab = R_tab; | |
1da177e4 LT |
223 | } |
224 | if (P_tab != NULL) { | |
e9ce1cd3 DM |
225 | qdisc_put_rtab(police->tcfp_P_tab); |
226 | police->tcfp_P_tab = P_tab; | |
1da177e4 LT |
227 | } |
228 | ||
7ba699c6 | 229 | if (tb[TCA_POLICE_RESULT]) |
1587bac4 | 230 | police->tcfp_result = nla_get_u32(tb[TCA_POLICE_RESULT]); |
e9ce1cd3 DM |
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; | |
1da177e4 | 237 | } |
e9ce1cd3 DM |
238 | if (police->tcfp_P_tab) |
239 | police->tcfp_ptoks = L2T_P(police, police->tcfp_mtu); | |
240 | police->tcf_action = parm->action; | |
1da177e4 | 241 | |
7ba699c6 | 242 | if (tb[TCA_POLICE_AVRATE]) |
1587bac4 | 243 | police->tcfp_ewma_rate = nla_get_u32(tb[TCA_POLICE_AVRATE]); |
1da177e4 | 244 | |
e9ce1cd3 | 245 | spin_unlock_bh(&police->tcf_lock); |
1da177e4 LT |
246 | if (ret != ACT_P_CREATED) |
247 | return ret; | |
248 | ||
3bebcda2 | 249 | police->tcfp_t_c = psched_get_time(); |
e9ce1cd3 DM |
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); | |
1da177e4 | 253 | write_lock_bh(&police_lock); |
e9ce1cd3 DM |
254 | police->tcf_next = tcf_police_ht[h]; |
255 | tcf_police_ht[h] = &police->common; | |
1da177e4 LT |
256 | write_unlock_bh(&police_lock); |
257 | ||
e9ce1cd3 | 258 | a->priv = police; |
1da177e4 LT |
259 | return ret; |
260 | ||
71bcb09a SH |
261 | failure_unlock: |
262 | spin_unlock_bh(&police->tcf_lock); | |
1da177e4 | 263 | failure: |
71bcb09a SH |
264 | if (P_tab) |
265 | qdisc_put_rtab(P_tab); | |
266 | if (R_tab) | |
267 | qdisc_put_rtab(R_tab); | |
1da177e4 | 268 | if (ret == ACT_P_CREATED) |
e9ce1cd3 | 269 | kfree(police); |
1da177e4 LT |
270 | return err; |
271 | } | |
272 | ||
273 | static int tcf_act_police_cleanup(struct tc_action *a, int bind) | |
274 | { | |
e9ce1cd3 | 275 | struct tcf_police *p = a->priv; |
c3bc7cff | 276 | int ret = 0; |
1da177e4 | 277 | |
c3bc7cff PM |
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; | |
1da177e4 LT |
289 | } |
290 | ||
f43c5a0d | 291 | static int tcf_act_police(struct sk_buff *skb, struct tc_action *a, |
10297b99 | 292 | struct tcf_result *res) |
1da177e4 | 293 | { |
e9ce1cd3 | 294 | struct tcf_police *police = a->priv; |
1da177e4 | 295 | psched_time_t now; |
1da177e4 LT |
296 | long toks; |
297 | long ptoks = 0; | |
298 | ||
e9ce1cd3 | 299 | spin_lock(&police->tcf_lock); |
1da177e4 | 300 | |
bfe0d029 | 301 | bstats_update(&police->tcf_bstats, skb); |
1da177e4 | 302 | |
e9ce1cd3 DM |
303 | if (police->tcfp_ewma_rate && |
304 | police->tcf_rate_est.bps >= police->tcfp_ewma_rate) { | |
305 | police->tcf_qstats.overlimits++; | |
b9647580 JP |
306 | if (police->tcf_action == TC_ACT_SHOT) |
307 | police->tcf_qstats.drops++; | |
e9ce1cd3 DM |
308 | spin_unlock(&police->tcf_lock); |
309 | return police->tcf_action; | |
1da177e4 | 310 | } |
1da177e4 | 311 | |
0abf77e5 | 312 | if (qdisc_pkt_len(skb) <= police->tcfp_mtu) { |
e9ce1cd3 DM |
313 | if (police->tcfp_R_tab == NULL) { |
314 | spin_unlock(&police->tcf_lock); | |
315 | return police->tcfp_result; | |
1da177e4 LT |
316 | } |
317 | ||
3bebcda2 | 318 | now = psched_get_time(); |
03cc45c0 PM |
319 | toks = psched_tdiff_bounded(now, police->tcfp_t_c, |
320 | police->tcfp_burst); | |
e9ce1cd3 DM |
321 | if (police->tcfp_P_tab) { |
322 | ptoks = toks + police->tcfp_ptoks; | |
323 | if (ptoks > (long)L2T_P(police, police->tcfp_mtu)) | |
324 | ptoks = (long)L2T_P(police, police->tcfp_mtu); | |
0abf77e5 | 325 | ptoks -= L2T_P(police, qdisc_pkt_len(skb)); |
1da177e4 | 326 | } |
e9ce1cd3 DM |
327 | toks += police->tcfp_toks; |
328 | if (toks > (long)police->tcfp_burst) | |
329 | toks = police->tcfp_burst; | |
0abf77e5 | 330 | toks -= L2T(police, qdisc_pkt_len(skb)); |
1da177e4 | 331 | if ((toks|ptoks) >= 0) { |
e9ce1cd3 DM |
332 | police->tcfp_t_c = now; |
333 | police->tcfp_toks = toks; | |
334 | police->tcfp_ptoks = ptoks; | |
335 | spin_unlock(&police->tcf_lock); | |
336 | return police->tcfp_result; | |
1da177e4 LT |
337 | } |
338 | } | |
339 | ||
e9ce1cd3 | 340 | police->tcf_qstats.overlimits++; |
b9647580 JP |
341 | if (police->tcf_action == TC_ACT_SHOT) |
342 | police->tcf_qstats.drops++; | |
e9ce1cd3 DM |
343 | spin_unlock(&police->tcf_lock); |
344 | return police->tcf_action; | |
1da177e4 LT |
345 | } |
346 | ||
347 | static int | |
348 | tcf_act_police_dump(struct sk_buff *skb, struct tc_action *a, int bind, int ref) | |
349 | { | |
27a884dc | 350 | unsigned char *b = skb_tail_pointer(skb); |
e9ce1cd3 | 351 | struct tcf_police *police = a->priv; |
0f04cfd0 JM |
352 | struct tc_police opt = { |
353 | .index = police->tcf_index, | |
354 | .action = police->tcf_action, | |
355 | .mtu = police->tcfp_mtu, | |
356 | .burst = police->tcfp_burst, | |
357 | .refcnt = police->tcf_refcnt - ref, | |
358 | .bindcnt = police->tcf_bindcnt - bind, | |
359 | }; | |
360 | ||
e9ce1cd3 DM |
361 | if (police->tcfp_R_tab) |
362 | opt.rate = police->tcfp_R_tab->rate; | |
e9ce1cd3 DM |
363 | if (police->tcfp_P_tab) |
364 | opt.peakrate = police->tcfp_P_tab->rate; | |
7ba699c6 | 365 | NLA_PUT(skb, TCA_POLICE_TBF, sizeof(opt), &opt); |
e9ce1cd3 | 366 | if (police->tcfp_result) |
24beeab5 | 367 | NLA_PUT_U32(skb, TCA_POLICE_RESULT, police->tcfp_result); |
e9ce1cd3 | 368 | if (police->tcfp_ewma_rate) |
24beeab5 | 369 | NLA_PUT_U32(skb, TCA_POLICE_AVRATE, police->tcfp_ewma_rate); |
1da177e4 LT |
370 | return skb->len; |
371 | ||
7ba699c6 | 372 | nla_put_failure: |
dc5fc579 | 373 | nlmsg_trim(skb, b); |
1da177e4 LT |
374 | return -1; |
375 | } | |
376 | ||
377 | MODULE_AUTHOR("Alexey Kuznetsov"); | |
378 | MODULE_DESCRIPTION("Policing actions"); | |
379 | MODULE_LICENSE("GPL"); | |
380 | ||
381 | static struct tc_action_ops act_police_ops = { | |
382 | .kind = "police", | |
e9ce1cd3 | 383 | .hinfo = &police_hash_info, |
1da177e4 LT |
384 | .type = TCA_ID_POLICE, |
385 | .capab = TCA_CAP_NONE, | |
386 | .owner = THIS_MODULE, | |
387 | .act = tcf_act_police, | |
388 | .dump = tcf_act_police_dump, | |
389 | .cleanup = tcf_act_police_cleanup, | |
e9ce1cd3 | 390 | .lookup = tcf_hash_search, |
1da177e4 | 391 | .init = tcf_act_police_locate, |
83b950c8 | 392 | .walk = tcf_act_police_walker |
1da177e4 LT |
393 | }; |
394 | ||
395 | static int __init | |
396 | police_init_module(void) | |
397 | { | |
398 | return tcf_register_action(&act_police_ops); | |
399 | } | |
400 | ||
401 | static void __exit | |
402 | police_cleanup_module(void) | |
403 | { | |
404 | tcf_unregister_action(&act_police_ops); | |
c7de2cf0 | 405 | rcu_barrier(); /* Wait for completion of call_rcu()'s (tcf_police_free_rcu) */ |
1da177e4 LT |
406 | } |
407 | ||
408 | module_init(police_init_module); | |
409 | module_exit(police_cleanup_module); |