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Commit | Line | Data |
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1da177e4 | 1 | /* |
0c6965dd | 2 | * net/sched/act_police.c Input police filter |
1da177e4 LT |
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 | |
0e243218 JP |
25 | struct tcf_police { |
26 | struct tcf_common common; | |
27 | int tcfp_result; | |
28 | u32 tcfp_ewma_rate; | |
c6d14ff1 | 29 | s64 tcfp_burst; |
0e243218 | 30 | u32 tcfp_mtu; |
c6d14ff1 JP |
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; | |
0e243218 JP |
39 | }; |
40 | #define to_police(pc) \ | |
a03e6fe5 | 41 | container_of(pc->priv, struct tcf_police, common) |
0e243218 | 42 | |
e9ce1cd3 | 43 | #define POL_TAB_MASK 15 |
1da177e4 | 44 | |
1e9b3d53 | 45 | /* old policer structure from before tc actions */ |
cc7ec456 | 46 | struct tc_police_compat { |
1e9b3d53 PM |
47 | u32 index; |
48 | int action; | |
49 | u32 limit; | |
50 | u32 burst; | |
51 | u32 mtu; | |
52 | struct tc_ratespec rate; | |
53 | struct tc_ratespec peakrate; | |
54 | }; | |
55 | ||
e9ce1cd3 | 56 | /* Each policer is serialized by its individual spinlock */ |
1da177e4 | 57 | |
ddf97ccd WC |
58 | static int police_net_id; |
59 | ||
60 | static int tcf_act_police_walker(struct net *net, struct sk_buff *skb, | |
61 | struct netlink_callback *cb, int type, | |
62 | struct tc_action *a) | |
1da177e4 | 63 | { |
ddf97ccd WC |
64 | struct tc_action_net *tn = net_generic(net, police_net_id); |
65 | struct tcf_hashinfo *hinfo = tn->hinfo; | |
89819dc0 | 66 | struct hlist_head *head; |
e9ce1cd3 | 67 | struct tcf_common *p; |
1da177e4 | 68 | int err = 0, index = -1, i = 0, s_i = 0, n_i = 0; |
4b3550ef | 69 | struct nlattr *nest; |
1da177e4 | 70 | |
c779f7af | 71 | spin_lock_bh(&hinfo->lock); |
1da177e4 LT |
72 | |
73 | s_i = cb->args[0]; | |
74 | ||
e9ce1cd3 | 75 | for (i = 0; i < (POL_TAB_MASK + 1); i++) { |
c779f7af | 76 | head = &hinfo->htab[tcf_hash(i, POL_TAB_MASK)]; |
1da177e4 | 77 | |
89819dc0 | 78 | hlist_for_each_entry_rcu(p, head, tcfc_head) { |
1da177e4 LT |
79 | index++; |
80 | if (index < s_i) | |
81 | continue; | |
82 | a->priv = p; | |
83 | a->order = index; | |
4b3550ef PM |
84 | nest = nla_nest_start(skb, a->order); |
85 | if (nest == NULL) | |
86 | goto nla_put_failure; | |
1da177e4 LT |
87 | if (type == RTM_DELACTION) |
88 | err = tcf_action_dump_1(skb, a, 0, 1); | |
89 | else | |
90 | err = tcf_action_dump_1(skb, a, 0, 0); | |
91 | if (err < 0) { | |
92 | index--; | |
4b3550ef | 93 | nla_nest_cancel(skb, nest); |
1da177e4 LT |
94 | goto done; |
95 | } | |
4b3550ef | 96 | nla_nest_end(skb, nest); |
1da177e4 LT |
97 | n_i++; |
98 | } | |
99 | } | |
100 | done: | |
c779f7af | 101 | spin_unlock_bh(&hinfo->lock); |
1da177e4 LT |
102 | if (n_i) |
103 | cb->args[0] += n_i; | |
104 | return n_i; | |
105 | ||
7ba699c6 | 106 | nla_put_failure: |
4b3550ef | 107 | nla_nest_cancel(skb, nest); |
1da177e4 LT |
108 | goto done; |
109 | } | |
1da177e4 | 110 | |
53b2bf3f PM |
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 }, | |
116 | }; | |
117 | ||
c1b52739 BL |
118 | static int tcf_act_police_locate(struct net *net, struct nlattr *nla, |
119 | struct nlattr *est, struct tc_action *a, | |
120 | int ovr, int bind) | |
1da177e4 | 121 | { |
1da177e4 | 122 | int ret = 0, err; |
7ba699c6 | 123 | struct nlattr *tb[TCA_POLICE_MAX + 1]; |
1da177e4 | 124 | struct tc_police *parm; |
e9ce1cd3 | 125 | struct tcf_police *police; |
1da177e4 | 126 | struct qdisc_rate_table *R_tab = NULL, *P_tab = NULL; |
ddf97ccd | 127 | struct tc_action_net *tn = net_generic(net, police_net_id); |
1e9b3d53 | 128 | int size; |
1da177e4 | 129 | |
cee63723 | 130 | if (nla == NULL) |
1da177e4 LT |
131 | return -EINVAL; |
132 | ||
53b2bf3f | 133 | err = nla_parse_nested(tb, TCA_POLICE_MAX, nla, police_policy); |
cee63723 PM |
134 | if (err < 0) |
135 | return err; | |
136 | ||
7ba699c6 | 137 | if (tb[TCA_POLICE_TBF] == NULL) |
1e9b3d53 | 138 | return -EINVAL; |
7ba699c6 | 139 | size = nla_len(tb[TCA_POLICE_TBF]); |
1e9b3d53 | 140 | if (size != sizeof(*parm) && size != sizeof(struct tc_police_compat)) |
1da177e4 | 141 | return -EINVAL; |
7ba699c6 | 142 | parm = nla_data(tb[TCA_POLICE_TBF]); |
1da177e4 | 143 | |
e9ce1cd3 | 144 | if (parm->index) { |
ddf97ccd | 145 | if (tcf_hash_search(tn, a, parm->index)) { |
a03e6fe5 | 146 | police = to_police(a); |
e9ce1cd3 DM |
147 | if (bind) { |
148 | police->tcf_bindcnt += 1; | |
149 | police->tcf_refcnt += 1; | |
1a29321e | 150 | return 0; |
e9ce1cd3 DM |
151 | } |
152 | if (ovr) | |
153 | goto override; | |
1a29321e JHS |
154 | /* not replacing */ |
155 | return -EEXIST; | |
1da177e4 | 156 | } |
a03e6fe5 WC |
157 | } else { |
158 | ret = tcf_hash_create(tn, parm->index, NULL, a, | |
159 | sizeof(*police), bind, false); | |
160 | if (ret) | |
161 | return ret; | |
162 | ret = ACT_P_CREATED; | |
1da177e4 LT |
163 | } |
164 | ||
a03e6fe5 | 165 | police = to_police(a); |
1da177e4 LT |
166 | override: |
167 | if (parm->rate.rate) { | |
168 | err = -ENOMEM; | |
7ba699c6 | 169 | R_tab = qdisc_get_rtab(&parm->rate, tb[TCA_POLICE_RATE]); |
1da177e4 LT |
170 | if (R_tab == NULL) |
171 | goto failure; | |
c1b56878 | 172 | |
1da177e4 LT |
173 | if (parm->peakrate.rate) { |
174 | P_tab = qdisc_get_rtab(&parm->peakrate, | |
7ba699c6 | 175 | tb[TCA_POLICE_PEAKRATE]); |
71bcb09a | 176 | if (P_tab == NULL) |
1da177e4 | 177 | goto failure; |
1da177e4 LT |
178 | } |
179 | } | |
71bcb09a | 180 | |
e9ce1cd3 | 181 | spin_lock_bh(&police->tcf_lock); |
71bcb09a | 182 | if (est) { |
22e0f8b9 | 183 | err = gen_replace_estimator(&police->tcf_bstats, NULL, |
71bcb09a SH |
184 | &police->tcf_rate_est, |
185 | &police->tcf_lock, est); | |
186 | if (err) | |
187 | goto failure_unlock; | |
a883bf56 JP |
188 | } else if (tb[TCA_POLICE_AVRATE] && |
189 | (ret == ACT_P_CREATED || | |
190 | !gen_estimator_active(&police->tcf_bstats, | |
191 | &police->tcf_rate_est))) { | |
192 | err = -EINVAL; | |
193 | goto failure_unlock; | |
71bcb09a SH |
194 | } |
195 | ||
196 | /* No failure allowed after this point */ | |
c6d14ff1 JP |
197 | police->tcfp_mtu = parm->mtu; |
198 | if (police->tcfp_mtu == 0) { | |
199 | police->tcfp_mtu = ~0; | |
200 | if (R_tab) | |
201 | police->tcfp_mtu = 255 << R_tab->rate.cell_log; | |
202 | } | |
203 | if (R_tab) { | |
204 | police->rate_present = true; | |
3e1e3aae | 205 | psched_ratecfg_precompute(&police->rate, &R_tab->rate, 0); |
c6d14ff1 JP |
206 | qdisc_put_rtab(R_tab); |
207 | } else { | |
208 | police->rate_present = false; | |
1da177e4 | 209 | } |
c6d14ff1 JP |
210 | if (P_tab) { |
211 | police->peak_present = true; | |
3e1e3aae | 212 | psched_ratecfg_precompute(&police->peak, &P_tab->rate, 0); |
c6d14ff1 JP |
213 | qdisc_put_rtab(P_tab); |
214 | } else { | |
215 | police->peak_present = false; | |
1da177e4 LT |
216 | } |
217 | ||
7ba699c6 | 218 | if (tb[TCA_POLICE_RESULT]) |
1587bac4 | 219 | police->tcfp_result = nla_get_u32(tb[TCA_POLICE_RESULT]); |
c6d14ff1 JP |
220 | police->tcfp_burst = PSCHED_TICKS2NS(parm->burst); |
221 | police->tcfp_toks = police->tcfp_burst; | |
222 | if (police->peak_present) { | |
223 | police->tcfp_mtu_ptoks = (s64) psched_l2t_ns(&police->peak, | |
224 | police->tcfp_mtu); | |
225 | police->tcfp_ptoks = police->tcfp_mtu_ptoks; | |
1da177e4 | 226 | } |
e9ce1cd3 | 227 | police->tcf_action = parm->action; |
1da177e4 | 228 | |
7ba699c6 | 229 | if (tb[TCA_POLICE_AVRATE]) |
1587bac4 | 230 | police->tcfp_ewma_rate = nla_get_u32(tb[TCA_POLICE_AVRATE]); |
1da177e4 | 231 | |
e9ce1cd3 | 232 | spin_unlock_bh(&police->tcf_lock); |
1da177e4 LT |
233 | if (ret != ACT_P_CREATED) |
234 | return ret; | |
235 | ||
d2de875c | 236 | police->tcfp_t_c = ktime_get_ns(); |
a03e6fe5 | 237 | tcf_hash_insert(tn, a); |
1da177e4 | 238 | |
1da177e4 LT |
239 | return ret; |
240 | ||
71bcb09a SH |
241 | failure_unlock: |
242 | spin_unlock_bh(&police->tcf_lock); | |
1da177e4 | 243 | failure: |
3b69a4c9 YY |
244 | qdisc_put_rtab(P_tab); |
245 | qdisc_put_rtab(R_tab); | |
1da177e4 | 246 | if (ret == ACT_P_CREATED) |
a03e6fe5 | 247 | tcf_hash_cleanup(a, est); |
1da177e4 LT |
248 | return err; |
249 | } | |
250 | ||
dc7f9f6e | 251 | static int tcf_act_police(struct sk_buff *skb, const struct tc_action *a, |
10297b99 | 252 | struct tcf_result *res) |
1da177e4 | 253 | { |
e9ce1cd3 | 254 | struct tcf_police *police = a->priv; |
c6d14ff1 JP |
255 | s64 now; |
256 | s64 toks; | |
257 | s64 ptoks = 0; | |
1da177e4 | 258 | |
e9ce1cd3 | 259 | spin_lock(&police->tcf_lock); |
1da177e4 | 260 | |
bfe0d029 | 261 | bstats_update(&police->tcf_bstats, skb); |
3d3ed181 | 262 | tcf_lastuse_update(&police->tcf_tm); |
1da177e4 | 263 | |
e9ce1cd3 DM |
264 | if (police->tcfp_ewma_rate && |
265 | police->tcf_rate_est.bps >= police->tcfp_ewma_rate) { | |
266 | police->tcf_qstats.overlimits++; | |
b9647580 JP |
267 | if (police->tcf_action == TC_ACT_SHOT) |
268 | police->tcf_qstats.drops++; | |
e9ce1cd3 DM |
269 | spin_unlock(&police->tcf_lock); |
270 | return police->tcf_action; | |
1da177e4 | 271 | } |
1da177e4 | 272 | |
0abf77e5 | 273 | if (qdisc_pkt_len(skb) <= police->tcfp_mtu) { |
c6d14ff1 | 274 | if (!police->rate_present) { |
e9ce1cd3 DM |
275 | spin_unlock(&police->tcf_lock); |
276 | return police->tcfp_result; | |
1da177e4 LT |
277 | } |
278 | ||
d2de875c | 279 | now = ktime_get_ns(); |
c6d14ff1 JP |
280 | toks = min_t(s64, now - police->tcfp_t_c, |
281 | police->tcfp_burst); | |
282 | if (police->peak_present) { | |
e9ce1cd3 | 283 | ptoks = toks + police->tcfp_ptoks; |
c6d14ff1 JP |
284 | if (ptoks > police->tcfp_mtu_ptoks) |
285 | ptoks = police->tcfp_mtu_ptoks; | |
286 | ptoks -= (s64) psched_l2t_ns(&police->peak, | |
287 | qdisc_pkt_len(skb)); | |
1da177e4 | 288 | } |
e9ce1cd3 | 289 | toks += police->tcfp_toks; |
c6d14ff1 | 290 | if (toks > police->tcfp_burst) |
e9ce1cd3 | 291 | toks = police->tcfp_burst; |
c6d14ff1 | 292 | toks -= (s64) psched_l2t_ns(&police->rate, qdisc_pkt_len(skb)); |
1da177e4 | 293 | if ((toks|ptoks) >= 0) { |
e9ce1cd3 DM |
294 | police->tcfp_t_c = now; |
295 | police->tcfp_toks = toks; | |
296 | police->tcfp_ptoks = ptoks; | |
297 | spin_unlock(&police->tcf_lock); | |
298 | return police->tcfp_result; | |
1da177e4 LT |
299 | } |
300 | } | |
301 | ||
e9ce1cd3 | 302 | police->tcf_qstats.overlimits++; |
b9647580 JP |
303 | if (police->tcf_action == TC_ACT_SHOT) |
304 | police->tcf_qstats.drops++; | |
e9ce1cd3 DM |
305 | spin_unlock(&police->tcf_lock); |
306 | return police->tcf_action; | |
1da177e4 LT |
307 | } |
308 | ||
309 | static int | |
310 | tcf_act_police_dump(struct sk_buff *skb, struct tc_action *a, int bind, int ref) | |
311 | { | |
27a884dc | 312 | unsigned char *b = skb_tail_pointer(skb); |
e9ce1cd3 | 313 | struct tcf_police *police = a->priv; |
0f04cfd0 JM |
314 | struct tc_police opt = { |
315 | .index = police->tcf_index, | |
316 | .action = police->tcf_action, | |
317 | .mtu = police->tcfp_mtu, | |
c6d14ff1 | 318 | .burst = PSCHED_NS2TICKS(police->tcfp_burst), |
0f04cfd0 JM |
319 | .refcnt = police->tcf_refcnt - ref, |
320 | .bindcnt = police->tcf_bindcnt - bind, | |
321 | }; | |
3d3ed181 | 322 | struct tcf_t t; |
0f04cfd0 | 323 | |
c6d14ff1 | 324 | if (police->rate_present) |
01cb71d2 | 325 | psched_ratecfg_getrate(&opt.rate, &police->rate); |
c6d14ff1 | 326 | if (police->peak_present) |
01cb71d2 | 327 | psched_ratecfg_getrate(&opt.peakrate, &police->peak); |
1b34ec43 DM |
328 | if (nla_put(skb, TCA_POLICE_TBF, sizeof(opt), &opt)) |
329 | goto nla_put_failure; | |
330 | if (police->tcfp_result && | |
331 | nla_put_u32(skb, TCA_POLICE_RESULT, police->tcfp_result)) | |
332 | goto nla_put_failure; | |
333 | if (police->tcfp_ewma_rate && | |
334 | nla_put_u32(skb, TCA_POLICE_AVRATE, police->tcfp_ewma_rate)) | |
335 | goto nla_put_failure; | |
3d3ed181 JHS |
336 | |
337 | t.install = jiffies_to_clock_t(jiffies - police->tcf_tm.install); | |
338 | t.lastuse = jiffies_to_clock_t(jiffies - police->tcf_tm.lastuse); | |
339 | t.expires = jiffies_to_clock_t(police->tcf_tm.expires); | |
340 | if (nla_put_64bit(skb, TCA_POLICE_TM, sizeof(t), &t, TCA_POLICE_PAD)) | |
341 | goto nla_put_failure; | |
342 | ||
1da177e4 LT |
343 | return skb->len; |
344 | ||
7ba699c6 | 345 | nla_put_failure: |
dc5fc579 | 346 | nlmsg_trim(skb, b); |
1da177e4 LT |
347 | return -1; |
348 | } | |
349 | ||
ddf97ccd WC |
350 | static int tcf_police_search(struct net *net, struct tc_action *a, u32 index) |
351 | { | |
352 | struct tc_action_net *tn = net_generic(net, police_net_id); | |
353 | ||
354 | return tcf_hash_search(tn, a, index); | |
355 | } | |
356 | ||
1da177e4 LT |
357 | MODULE_AUTHOR("Alexey Kuznetsov"); |
358 | MODULE_DESCRIPTION("Policing actions"); | |
359 | MODULE_LICENSE("GPL"); | |
360 | ||
361 | static struct tc_action_ops act_police_ops = { | |
362 | .kind = "police", | |
363 | .type = TCA_ID_POLICE, | |
1da177e4 LT |
364 | .owner = THIS_MODULE, |
365 | .act = tcf_act_police, | |
366 | .dump = tcf_act_police_dump, | |
1da177e4 | 367 | .init = tcf_act_police_locate, |
ddf97ccd WC |
368 | .walk = tcf_act_police_walker, |
369 | .lookup = tcf_police_search, | |
370 | }; | |
371 | ||
372 | static __net_init int police_init_net(struct net *net) | |
373 | { | |
374 | struct tc_action_net *tn = net_generic(net, police_net_id); | |
375 | ||
376 | return tc_action_net_init(tn, &act_police_ops, POL_TAB_MASK); | |
377 | } | |
378 | ||
379 | static void __net_exit police_exit_net(struct net *net) | |
380 | { | |
381 | struct tc_action_net *tn = net_generic(net, police_net_id); | |
382 | ||
383 | tc_action_net_exit(tn); | |
384 | } | |
385 | ||
386 | static struct pernet_operations police_net_ops = { | |
387 | .init = police_init_net, | |
388 | .exit = police_exit_net, | |
389 | .id = &police_net_id, | |
390 | .size = sizeof(struct tc_action_net), | |
1da177e4 LT |
391 | }; |
392 | ||
393 | static int __init | |
394 | police_init_module(void) | |
395 | { | |
ddf97ccd | 396 | return tcf_register_action(&act_police_ops, &police_net_ops); |
1da177e4 LT |
397 | } |
398 | ||
399 | static void __exit | |
400 | police_cleanup_module(void) | |
401 | { | |
ddf97ccd | 402 | tcf_unregister_action(&act_police_ops, &police_net_ops); |
1da177e4 LT |
403 | } |
404 | ||
405 | module_init(police_init_module); | |
406 | module_exit(police_cleanup_module); |