Commit | Line | Data |
---|---|---|
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 | 25 | struct tcf_police { |
ec0595cc | 26 | struct tc_action common; |
0e243218 JP |
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 | 39 | }; |
a85a970a WC |
40 | |
41 | #define to_police(pc) ((struct tcf_police *)pc) | |
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 | 58 | static int police_net_id; |
a85a970a | 59 | static struct tc_action_ops act_police_ops; |
ddf97ccd WC |
60 | |
61 | static int tcf_act_police_walker(struct net *net, struct sk_buff *skb, | |
62 | struct netlink_callback *cb, int type, | |
a85a970a | 63 | const struct tc_action_ops *ops) |
1da177e4 | 64 | { |
ddf97ccd WC |
65 | struct tc_action_net *tn = net_generic(net, police_net_id); |
66 | struct tcf_hashinfo *hinfo = tn->hinfo; | |
1da177e4 | 67 | int err = 0, index = -1, i = 0, s_i = 0, n_i = 0; |
4b3550ef | 68 | struct nlattr *nest; |
1da177e4 | 69 | |
c779f7af | 70 | spin_lock_bh(&hinfo->lock); |
1da177e4 LT |
71 | |
72 | s_i = cb->args[0]; | |
73 | ||
e9ce1cd3 | 74 | for (i = 0; i < (POL_TAB_MASK + 1); i++) { |
a85a970a | 75 | struct hlist_head *head; |
ec0595cc | 76 | struct tc_action *p; |
a85a970a | 77 | |
c779f7af | 78 | head = &hinfo->htab[tcf_hash(i, POL_TAB_MASK)]; |
1da177e4 | 79 | |
ec0595cc | 80 | hlist_for_each_entry_rcu(p, head, tcfa_head) { |
1da177e4 LT |
81 | index++; |
82 | if (index < s_i) | |
83 | continue; | |
a85a970a | 84 | nest = nla_nest_start(skb, index); |
4b3550ef PM |
85 | if (nest == NULL) |
86 | goto nla_put_failure; | |
1da177e4 | 87 | if (type == RTM_DELACTION) |
ec0595cc | 88 | err = tcf_action_dump_1(skb, p, 0, 1); |
1da177e4 | 89 | else |
ec0595cc | 90 | err = tcf_action_dump_1(skb, p, 0, 0); |
1da177e4 LT |
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 | ||
d9fa17ef | 118 | static int tcf_act_police_init(struct net *net, struct nlattr *nla, |
a85a970a | 119 | struct nlattr *est, struct tc_action **a, |
d9fa17ef | 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) { |
a85a970a | 145 | if (tcf_hash_check(tn, parm->index, a, bind)) { |
e9ce1cd3 DM |
146 | if (ovr) |
147 | goto override; | |
1a29321e JHS |
148 | /* not replacing */ |
149 | return -EEXIST; | |
1da177e4 | 150 | } |
a03e6fe5 WC |
151 | } else { |
152 | ret = tcf_hash_create(tn, parm->index, NULL, a, | |
a85a970a | 153 | &act_police_ops, bind, false); |
a03e6fe5 WC |
154 | if (ret) |
155 | return ret; | |
156 | ret = ACT_P_CREATED; | |
1da177e4 LT |
157 | } |
158 | ||
1da177e4 | 159 | override: |
a85a970a | 160 | police = to_police(*a); |
1da177e4 LT |
161 | if (parm->rate.rate) { |
162 | err = -ENOMEM; | |
7ba699c6 | 163 | R_tab = qdisc_get_rtab(&parm->rate, tb[TCA_POLICE_RATE]); |
1da177e4 LT |
164 | if (R_tab == NULL) |
165 | goto failure; | |
c1b56878 | 166 | |
1da177e4 LT |
167 | if (parm->peakrate.rate) { |
168 | P_tab = qdisc_get_rtab(&parm->peakrate, | |
7ba699c6 | 169 | tb[TCA_POLICE_PEAKRATE]); |
71bcb09a | 170 | if (P_tab == NULL) |
1da177e4 | 171 | goto failure; |
1da177e4 LT |
172 | } |
173 | } | |
71bcb09a | 174 | |
e9ce1cd3 | 175 | spin_lock_bh(&police->tcf_lock); |
71bcb09a | 176 | if (est) { |
22e0f8b9 | 177 | err = gen_replace_estimator(&police->tcf_bstats, NULL, |
71bcb09a | 178 | &police->tcf_rate_est, |
edb09eb1 ED |
179 | &police->tcf_lock, |
180 | NULL, est); | |
71bcb09a SH |
181 | if (err) |
182 | goto failure_unlock; | |
a883bf56 JP |
183 | } else if (tb[TCA_POLICE_AVRATE] && |
184 | (ret == ACT_P_CREATED || | |
185 | !gen_estimator_active(&police->tcf_bstats, | |
186 | &police->tcf_rate_est))) { | |
187 | err = -EINVAL; | |
188 | goto failure_unlock; | |
71bcb09a SH |
189 | } |
190 | ||
191 | /* No failure allowed after this point */ | |
c6d14ff1 JP |
192 | police->tcfp_mtu = parm->mtu; |
193 | if (police->tcfp_mtu == 0) { | |
194 | police->tcfp_mtu = ~0; | |
195 | if (R_tab) | |
196 | police->tcfp_mtu = 255 << R_tab->rate.cell_log; | |
197 | } | |
198 | if (R_tab) { | |
199 | police->rate_present = true; | |
3e1e3aae | 200 | psched_ratecfg_precompute(&police->rate, &R_tab->rate, 0); |
c6d14ff1 JP |
201 | qdisc_put_rtab(R_tab); |
202 | } else { | |
203 | police->rate_present = false; | |
1da177e4 | 204 | } |
c6d14ff1 JP |
205 | if (P_tab) { |
206 | police->peak_present = true; | |
3e1e3aae | 207 | psched_ratecfg_precompute(&police->peak, &P_tab->rate, 0); |
c6d14ff1 JP |
208 | qdisc_put_rtab(P_tab); |
209 | } else { | |
210 | police->peak_present = false; | |
1da177e4 LT |
211 | } |
212 | ||
7ba699c6 | 213 | if (tb[TCA_POLICE_RESULT]) |
1587bac4 | 214 | police->tcfp_result = nla_get_u32(tb[TCA_POLICE_RESULT]); |
c6d14ff1 JP |
215 | police->tcfp_burst = PSCHED_TICKS2NS(parm->burst); |
216 | police->tcfp_toks = police->tcfp_burst; | |
217 | if (police->peak_present) { | |
218 | police->tcfp_mtu_ptoks = (s64) psched_l2t_ns(&police->peak, | |
219 | police->tcfp_mtu); | |
220 | police->tcfp_ptoks = police->tcfp_mtu_ptoks; | |
1da177e4 | 221 | } |
e9ce1cd3 | 222 | police->tcf_action = parm->action; |
1da177e4 | 223 | |
7ba699c6 | 224 | if (tb[TCA_POLICE_AVRATE]) |
1587bac4 | 225 | police->tcfp_ewma_rate = nla_get_u32(tb[TCA_POLICE_AVRATE]); |
1da177e4 | 226 | |
e9ce1cd3 | 227 | spin_unlock_bh(&police->tcf_lock); |
1da177e4 LT |
228 | if (ret != ACT_P_CREATED) |
229 | return ret; | |
230 | ||
d2de875c | 231 | police->tcfp_t_c = ktime_get_ns(); |
a85a970a | 232 | tcf_hash_insert(tn, *a); |
1da177e4 | 233 | |
1da177e4 LT |
234 | return ret; |
235 | ||
71bcb09a SH |
236 | failure_unlock: |
237 | spin_unlock_bh(&police->tcf_lock); | |
1da177e4 | 238 | failure: |
3b69a4c9 YY |
239 | qdisc_put_rtab(P_tab); |
240 | qdisc_put_rtab(R_tab); | |
1da177e4 | 241 | if (ret == ACT_P_CREATED) |
a85a970a | 242 | tcf_hash_cleanup(*a, est); |
1da177e4 LT |
243 | return err; |
244 | } | |
245 | ||
dc7f9f6e | 246 | static int tcf_act_police(struct sk_buff *skb, const struct tc_action *a, |
10297b99 | 247 | struct tcf_result *res) |
1da177e4 | 248 | { |
a85a970a | 249 | struct tcf_police *police = to_police(a); |
c6d14ff1 JP |
250 | s64 now; |
251 | s64 toks; | |
252 | s64 ptoks = 0; | |
1da177e4 | 253 | |
e9ce1cd3 | 254 | spin_lock(&police->tcf_lock); |
1da177e4 | 255 | |
bfe0d029 | 256 | bstats_update(&police->tcf_bstats, skb); |
3d3ed181 | 257 | tcf_lastuse_update(&police->tcf_tm); |
1da177e4 | 258 | |
e9ce1cd3 DM |
259 | if (police->tcfp_ewma_rate && |
260 | police->tcf_rate_est.bps >= police->tcfp_ewma_rate) { | |
261 | police->tcf_qstats.overlimits++; | |
b9647580 JP |
262 | if (police->tcf_action == TC_ACT_SHOT) |
263 | police->tcf_qstats.drops++; | |
e9ce1cd3 DM |
264 | spin_unlock(&police->tcf_lock); |
265 | return police->tcf_action; | |
1da177e4 | 266 | } |
1da177e4 | 267 | |
0abf77e5 | 268 | if (qdisc_pkt_len(skb) <= police->tcfp_mtu) { |
c6d14ff1 | 269 | if (!police->rate_present) { |
e9ce1cd3 DM |
270 | spin_unlock(&police->tcf_lock); |
271 | return police->tcfp_result; | |
1da177e4 LT |
272 | } |
273 | ||
d2de875c | 274 | now = ktime_get_ns(); |
c6d14ff1 JP |
275 | toks = min_t(s64, now - police->tcfp_t_c, |
276 | police->tcfp_burst); | |
277 | if (police->peak_present) { | |
e9ce1cd3 | 278 | ptoks = toks + police->tcfp_ptoks; |
c6d14ff1 JP |
279 | if (ptoks > police->tcfp_mtu_ptoks) |
280 | ptoks = police->tcfp_mtu_ptoks; | |
281 | ptoks -= (s64) psched_l2t_ns(&police->peak, | |
282 | qdisc_pkt_len(skb)); | |
1da177e4 | 283 | } |
e9ce1cd3 | 284 | toks += police->tcfp_toks; |
c6d14ff1 | 285 | if (toks > police->tcfp_burst) |
e9ce1cd3 | 286 | toks = police->tcfp_burst; |
c6d14ff1 | 287 | toks -= (s64) psched_l2t_ns(&police->rate, qdisc_pkt_len(skb)); |
1da177e4 | 288 | if ((toks|ptoks) >= 0) { |
e9ce1cd3 DM |
289 | police->tcfp_t_c = now; |
290 | police->tcfp_toks = toks; | |
291 | police->tcfp_ptoks = ptoks; | |
292 | spin_unlock(&police->tcf_lock); | |
293 | return police->tcfp_result; | |
1da177e4 LT |
294 | } |
295 | } | |
296 | ||
e9ce1cd3 | 297 | police->tcf_qstats.overlimits++; |
b9647580 JP |
298 | if (police->tcf_action == TC_ACT_SHOT) |
299 | police->tcf_qstats.drops++; | |
e9ce1cd3 DM |
300 | spin_unlock(&police->tcf_lock); |
301 | return police->tcf_action; | |
1da177e4 LT |
302 | } |
303 | ||
304 | static int | |
305 | tcf_act_police_dump(struct sk_buff *skb, struct tc_action *a, int bind, int ref) | |
306 | { | |
27a884dc | 307 | unsigned char *b = skb_tail_pointer(skb); |
a85a970a | 308 | struct tcf_police *police = to_police(a); |
0f04cfd0 JM |
309 | struct tc_police opt = { |
310 | .index = police->tcf_index, | |
311 | .action = police->tcf_action, | |
312 | .mtu = police->tcfp_mtu, | |
c6d14ff1 | 313 | .burst = PSCHED_NS2TICKS(police->tcfp_burst), |
0f04cfd0 JM |
314 | .refcnt = police->tcf_refcnt - ref, |
315 | .bindcnt = police->tcf_bindcnt - bind, | |
316 | }; | |
3d3ed181 | 317 | struct tcf_t t; |
0f04cfd0 | 318 | |
c6d14ff1 | 319 | if (police->rate_present) |
01cb71d2 | 320 | psched_ratecfg_getrate(&opt.rate, &police->rate); |
c6d14ff1 | 321 | if (police->peak_present) |
01cb71d2 | 322 | psched_ratecfg_getrate(&opt.peakrate, &police->peak); |
1b34ec43 DM |
323 | if (nla_put(skb, TCA_POLICE_TBF, sizeof(opt), &opt)) |
324 | goto nla_put_failure; | |
325 | if (police->tcfp_result && | |
326 | nla_put_u32(skb, TCA_POLICE_RESULT, police->tcfp_result)) | |
327 | goto nla_put_failure; | |
328 | if (police->tcfp_ewma_rate && | |
329 | nla_put_u32(skb, TCA_POLICE_AVRATE, police->tcfp_ewma_rate)) | |
330 | goto nla_put_failure; | |
3d3ed181 JHS |
331 | |
332 | t.install = jiffies_to_clock_t(jiffies - police->tcf_tm.install); | |
333 | t.lastuse = jiffies_to_clock_t(jiffies - police->tcf_tm.lastuse); | |
53eb440f | 334 | t.firstuse = jiffies_to_clock_t(jiffies - police->tcf_tm.firstuse); |
3d3ed181 JHS |
335 | t.expires = jiffies_to_clock_t(police->tcf_tm.expires); |
336 | if (nla_put_64bit(skb, TCA_POLICE_TM, sizeof(t), &t, TCA_POLICE_PAD)) | |
337 | goto nla_put_failure; | |
338 | ||
1da177e4 LT |
339 | return skb->len; |
340 | ||
7ba699c6 | 341 | nla_put_failure: |
dc5fc579 | 342 | nlmsg_trim(skb, b); |
1da177e4 LT |
343 | return -1; |
344 | } | |
345 | ||
a85a970a | 346 | static int tcf_police_search(struct net *net, struct tc_action **a, u32 index) |
ddf97ccd WC |
347 | { |
348 | struct tc_action_net *tn = net_generic(net, police_net_id); | |
349 | ||
350 | return tcf_hash_search(tn, a, index); | |
351 | } | |
352 | ||
1da177e4 LT |
353 | MODULE_AUTHOR("Alexey Kuznetsov"); |
354 | MODULE_DESCRIPTION("Policing actions"); | |
355 | MODULE_LICENSE("GPL"); | |
356 | ||
357 | static struct tc_action_ops act_police_ops = { | |
358 | .kind = "police", | |
359 | .type = TCA_ID_POLICE, | |
1da177e4 LT |
360 | .owner = THIS_MODULE, |
361 | .act = tcf_act_police, | |
362 | .dump = tcf_act_police_dump, | |
d9fa17ef | 363 | .init = tcf_act_police_init, |
ddf97ccd WC |
364 | .walk = tcf_act_police_walker, |
365 | .lookup = tcf_police_search, | |
a85a970a | 366 | .size = sizeof(struct tcf_police), |
ddf97ccd WC |
367 | }; |
368 | ||
369 | static __net_init int police_init_net(struct net *net) | |
370 | { | |
371 | struct tc_action_net *tn = net_generic(net, police_net_id); | |
372 | ||
373 | return tc_action_net_init(tn, &act_police_ops, POL_TAB_MASK); | |
374 | } | |
375 | ||
376 | static void __net_exit police_exit_net(struct net *net) | |
377 | { | |
378 | struct tc_action_net *tn = net_generic(net, police_net_id); | |
379 | ||
380 | tc_action_net_exit(tn); | |
381 | } | |
382 | ||
383 | static struct pernet_operations police_net_ops = { | |
384 | .init = police_init_net, | |
385 | .exit = police_exit_net, | |
386 | .id = &police_net_id, | |
387 | .size = sizeof(struct tc_action_net), | |
1da177e4 LT |
388 | }; |
389 | ||
390 | static int __init | |
391 | police_init_module(void) | |
392 | { | |
ddf97ccd | 393 | return tcf_register_action(&act_police_ops, &police_net_ops); |
1da177e4 LT |
394 | } |
395 | ||
396 | static void __exit | |
397 | police_cleanup_module(void) | |
398 | { | |
ddf97ccd | 399 | tcf_unregister_action(&act_police_ops, &police_net_ops); |
1da177e4 LT |
400 | } |
401 | ||
402 | module_init(police_init_module); | |
403 | module_exit(police_cleanup_module); |