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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 <net/act_api.h> | |
22 | #include <net/netlink.h> | |
23 | ||
24 | #define L2T(p,L) qdisc_l2t((p)->tcfp_R_tab, L) | |
25 | #define L2T_P(p,L) qdisc_l2t((p)->tcfp_P_tab, L) | |
26 | ||
27 | #define POL_TAB_MASK 15 | |
28 | static struct tcf_common *tcf_police_ht[POL_TAB_MASK + 1]; | |
29 | static u32 police_idx_gen; | |
30 | static DEFINE_RWLOCK(police_lock); | |
31 | ||
32 | static struct tcf_hashinfo police_hash_info = { | |
33 | .htab = tcf_police_ht, | |
34 | .hmask = POL_TAB_MASK, | |
35 | .lock = &police_lock, | |
36 | }; | |
37 | ||
38 | /* old policer structure from before tc actions */ | |
39 | struct tc_police_compat | |
40 | { | |
41 | u32 index; | |
42 | int action; | |
43 | u32 limit; | |
44 | u32 burst; | |
45 | u32 mtu; | |
46 | struct tc_ratespec rate; | |
47 | struct tc_ratespec peakrate; | |
48 | }; | |
49 | ||
50 | /* Each policer is serialized by its individual spinlock */ | |
51 | ||
52 | static int tcf_act_police_walker(struct sk_buff *skb, struct netlink_callback *cb, | |
53 | int type, struct tc_action *a) | |
54 | { | |
55 | struct tcf_common *p; | |
56 | int err = 0, index = -1, i = 0, s_i = 0, n_i = 0; | |
57 | struct rtattr *r; | |
58 | ||
59 | read_lock_bh(&police_lock); | |
60 | ||
61 | s_i = cb->args[0]; | |
62 | ||
63 | for (i = 0; i < (POL_TAB_MASK + 1); i++) { | |
64 | p = tcf_police_ht[tcf_hash(i, POL_TAB_MASK)]; | |
65 | ||
66 | for (; p; p = p->tcfc_next) { | |
67 | index++; | |
68 | if (index < s_i) | |
69 | continue; | |
70 | a->priv = p; | |
71 | a->order = index; | |
72 | r = (struct rtattr *)skb_tail_pointer(skb); | |
73 | RTA_PUT(skb, a->order, 0, NULL); | |
74 | if (type == RTM_DELACTION) | |
75 | err = tcf_action_dump_1(skb, a, 0, 1); | |
76 | else | |
77 | err = tcf_action_dump_1(skb, a, 0, 0); | |
78 | if (err < 0) { | |
79 | index--; | |
80 | nlmsg_trim(skb, r); | |
81 | goto done; | |
82 | } | |
83 | r->rta_len = skb_tail_pointer(skb) - (u8 *)r; | |
84 | n_i++; | |
85 | } | |
86 | } | |
87 | done: | |
88 | read_unlock_bh(&police_lock); | |
89 | if (n_i) | |
90 | cb->args[0] += n_i; | |
91 | return n_i; | |
92 | ||
93 | rtattr_failure: | |
94 | nlmsg_trim(skb, r); | |
95 | goto done; | |
96 | } | |
97 | ||
98 | static void tcf_police_destroy(struct tcf_police *p) | |
99 | { | |
100 | unsigned int h = tcf_hash(p->tcf_index, POL_TAB_MASK); | |
101 | struct tcf_common **p1p; | |
102 | ||
103 | for (p1p = &tcf_police_ht[h]; *p1p; p1p = &(*p1p)->tcfc_next) { | |
104 | if (*p1p == &p->common) { | |
105 | write_lock_bh(&police_lock); | |
106 | *p1p = p->tcf_next; | |
107 | write_unlock_bh(&police_lock); | |
108 | gen_kill_estimator(&p->tcf_bstats, | |
109 | &p->tcf_rate_est); | |
110 | if (p->tcfp_R_tab) | |
111 | qdisc_put_rtab(p->tcfp_R_tab); | |
112 | if (p->tcfp_P_tab) | |
113 | qdisc_put_rtab(p->tcfp_P_tab); | |
114 | kfree(p); | |
115 | return; | |
116 | } | |
117 | } | |
118 | BUG_TRAP(0); | |
119 | } | |
120 | ||
121 | static int tcf_act_police_locate(struct rtattr *rta, struct rtattr *est, | |
122 | struct tc_action *a, int ovr, int bind) | |
123 | { | |
124 | unsigned h; | |
125 | int ret = 0, err; | |
126 | struct rtattr *tb[TCA_POLICE_MAX]; | |
127 | struct tc_police *parm; | |
128 | struct tcf_police *police; | |
129 | struct qdisc_rate_table *R_tab = NULL, *P_tab = NULL; | |
130 | int size; | |
131 | ||
132 | if (rta == NULL || rtattr_parse_nested(tb, TCA_POLICE_MAX, rta) < 0) | |
133 | return -EINVAL; | |
134 | ||
135 | if (tb[TCA_POLICE_TBF-1] == NULL) | |
136 | return -EINVAL; | |
137 | size = RTA_PAYLOAD(tb[TCA_POLICE_TBF-1]); | |
138 | if (size != sizeof(*parm) && size != sizeof(struct tc_police_compat)) | |
139 | return -EINVAL; | |
140 | parm = RTA_DATA(tb[TCA_POLICE_TBF-1]); | |
141 | ||
142 | if (tb[TCA_POLICE_RESULT-1] != NULL && | |
143 | RTA_PAYLOAD(tb[TCA_POLICE_RESULT-1]) != sizeof(u32)) | |
144 | return -EINVAL; | |
145 | if (tb[TCA_POLICE_RESULT-1] != NULL && | |
146 | RTA_PAYLOAD(tb[TCA_POLICE_RESULT-1]) != sizeof(u32)) | |
147 | return -EINVAL; | |
148 | ||
149 | if (parm->index) { | |
150 | struct tcf_common *pc; | |
151 | ||
152 | pc = tcf_hash_lookup(parm->index, &police_hash_info); | |
153 | if (pc != NULL) { | |
154 | a->priv = pc; | |
155 | police = to_police(pc); | |
156 | if (bind) { | |
157 | police->tcf_bindcnt += 1; | |
158 | police->tcf_refcnt += 1; | |
159 | } | |
160 | if (ovr) | |
161 | goto override; | |
162 | return ret; | |
163 | } | |
164 | } | |
165 | ||
166 | police = kzalloc(sizeof(*police), GFP_KERNEL); | |
167 | if (police == NULL) | |
168 | return -ENOMEM; | |
169 | ret = ACT_P_CREATED; | |
170 | police->tcf_refcnt = 1; | |
171 | spin_lock_init(&police->tcf_lock); | |
172 | if (bind) | |
173 | police->tcf_bindcnt = 1; | |
174 | override: | |
175 | if (parm->rate.rate) { | |
176 | err = -ENOMEM; | |
177 | R_tab = qdisc_get_rtab(&parm->rate, (struct nlattr *)tb[TCA_POLICE_RATE-1]); | |
178 | if (R_tab == NULL) | |
179 | goto failure; | |
180 | if (parm->peakrate.rate) { | |
181 | P_tab = qdisc_get_rtab(&parm->peakrate, | |
182 | (struct nlattr *)tb[TCA_POLICE_PEAKRATE-1]); | |
183 | if (P_tab == NULL) { | |
184 | qdisc_put_rtab(R_tab); | |
185 | goto failure; | |
186 | } | |
187 | } | |
188 | } | |
189 | /* No failure allowed after this point */ | |
190 | spin_lock_bh(&police->tcf_lock); | |
191 | if (R_tab != NULL) { | |
192 | qdisc_put_rtab(police->tcfp_R_tab); | |
193 | police->tcfp_R_tab = R_tab; | |
194 | } | |
195 | if (P_tab != NULL) { | |
196 | qdisc_put_rtab(police->tcfp_P_tab); | |
197 | police->tcfp_P_tab = P_tab; | |
198 | } | |
199 | ||
200 | if (tb[TCA_POLICE_RESULT-1]) | |
201 | police->tcfp_result = *(u32*)RTA_DATA(tb[TCA_POLICE_RESULT-1]); | |
202 | police->tcfp_toks = police->tcfp_burst = parm->burst; | |
203 | police->tcfp_mtu = parm->mtu; | |
204 | if (police->tcfp_mtu == 0) { | |
205 | police->tcfp_mtu = ~0; | |
206 | if (police->tcfp_R_tab) | |
207 | police->tcfp_mtu = 255<<police->tcfp_R_tab->rate.cell_log; | |
208 | } | |
209 | if (police->tcfp_P_tab) | |
210 | police->tcfp_ptoks = L2T_P(police, police->tcfp_mtu); | |
211 | police->tcf_action = parm->action; | |
212 | ||
213 | if (tb[TCA_POLICE_AVRATE-1]) | |
214 | police->tcfp_ewma_rate = | |
215 | *(u32*)RTA_DATA(tb[TCA_POLICE_AVRATE-1]); | |
216 | if (est) | |
217 | gen_replace_estimator(&police->tcf_bstats, | |
218 | &police->tcf_rate_est, | |
219 | &police->tcf_lock, (struct nlattr *)est); | |
220 | ||
221 | spin_unlock_bh(&police->tcf_lock); | |
222 | if (ret != ACT_P_CREATED) | |
223 | return ret; | |
224 | ||
225 | police->tcfp_t_c = psched_get_time(); | |
226 | police->tcf_index = parm->index ? parm->index : | |
227 | tcf_hash_new_index(&police_idx_gen, &police_hash_info); | |
228 | h = tcf_hash(police->tcf_index, POL_TAB_MASK); | |
229 | write_lock_bh(&police_lock); | |
230 | police->tcf_next = tcf_police_ht[h]; | |
231 | tcf_police_ht[h] = &police->common; | |
232 | write_unlock_bh(&police_lock); | |
233 | ||
234 | a->priv = police; | |
235 | return ret; | |
236 | ||
237 | failure: | |
238 | if (ret == ACT_P_CREATED) | |
239 | kfree(police); | |
240 | return err; | |
241 | } | |
242 | ||
243 | static int tcf_act_police_cleanup(struct tc_action *a, int bind) | |
244 | { | |
245 | struct tcf_police *p = a->priv; | |
246 | int ret = 0; | |
247 | ||
248 | if (p != NULL) { | |
249 | if (bind) | |
250 | p->tcf_bindcnt--; | |
251 | ||
252 | p->tcf_refcnt--; | |
253 | if (p->tcf_refcnt <= 0 && !p->tcf_bindcnt) { | |
254 | tcf_police_destroy(p); | |
255 | ret = 1; | |
256 | } | |
257 | } | |
258 | return ret; | |
259 | } | |
260 | ||
261 | static int tcf_act_police(struct sk_buff *skb, struct tc_action *a, | |
262 | struct tcf_result *res) | |
263 | { | |
264 | struct tcf_police *police = a->priv; | |
265 | psched_time_t now; | |
266 | long toks; | |
267 | long ptoks = 0; | |
268 | ||
269 | spin_lock(&police->tcf_lock); | |
270 | ||
271 | police->tcf_bstats.bytes += skb->len; | |
272 | police->tcf_bstats.packets++; | |
273 | ||
274 | if (police->tcfp_ewma_rate && | |
275 | police->tcf_rate_est.bps >= police->tcfp_ewma_rate) { | |
276 | police->tcf_qstats.overlimits++; | |
277 | spin_unlock(&police->tcf_lock); | |
278 | return police->tcf_action; | |
279 | } | |
280 | ||
281 | if (skb->len <= police->tcfp_mtu) { | |
282 | if (police->tcfp_R_tab == NULL) { | |
283 | spin_unlock(&police->tcf_lock); | |
284 | return police->tcfp_result; | |
285 | } | |
286 | ||
287 | now = psched_get_time(); | |
288 | toks = psched_tdiff_bounded(now, police->tcfp_t_c, | |
289 | police->tcfp_burst); | |
290 | if (police->tcfp_P_tab) { | |
291 | ptoks = toks + police->tcfp_ptoks; | |
292 | if (ptoks > (long)L2T_P(police, police->tcfp_mtu)) | |
293 | ptoks = (long)L2T_P(police, police->tcfp_mtu); | |
294 | ptoks -= L2T_P(police, skb->len); | |
295 | } | |
296 | toks += police->tcfp_toks; | |
297 | if (toks > (long)police->tcfp_burst) | |
298 | toks = police->tcfp_burst; | |
299 | toks -= L2T(police, skb->len); | |
300 | if ((toks|ptoks) >= 0) { | |
301 | police->tcfp_t_c = now; | |
302 | police->tcfp_toks = toks; | |
303 | police->tcfp_ptoks = ptoks; | |
304 | spin_unlock(&police->tcf_lock); | |
305 | return police->tcfp_result; | |
306 | } | |
307 | } | |
308 | ||
309 | police->tcf_qstats.overlimits++; | |
310 | spin_unlock(&police->tcf_lock); | |
311 | return police->tcf_action; | |
312 | } | |
313 | ||
314 | static int | |
315 | tcf_act_police_dump(struct sk_buff *skb, struct tc_action *a, int bind, int ref) | |
316 | { | |
317 | unsigned char *b = skb_tail_pointer(skb); | |
318 | struct tcf_police *police = a->priv; | |
319 | struct tc_police opt; | |
320 | ||
321 | opt.index = police->tcf_index; | |
322 | opt.action = police->tcf_action; | |
323 | opt.mtu = police->tcfp_mtu; | |
324 | opt.burst = police->tcfp_burst; | |
325 | opt.refcnt = police->tcf_refcnt - ref; | |
326 | opt.bindcnt = police->tcf_bindcnt - bind; | |
327 | if (police->tcfp_R_tab) | |
328 | opt.rate = police->tcfp_R_tab->rate; | |
329 | else | |
330 | memset(&opt.rate, 0, sizeof(opt.rate)); | |
331 | if (police->tcfp_P_tab) | |
332 | opt.peakrate = police->tcfp_P_tab->rate; | |
333 | else | |
334 | memset(&opt.peakrate, 0, sizeof(opt.peakrate)); | |
335 | RTA_PUT(skb, TCA_POLICE_TBF, sizeof(opt), &opt); | |
336 | if (police->tcfp_result) | |
337 | RTA_PUT(skb, TCA_POLICE_RESULT, sizeof(int), | |
338 | &police->tcfp_result); | |
339 | if (police->tcfp_ewma_rate) | |
340 | RTA_PUT(skb, TCA_POLICE_AVRATE, 4, &police->tcfp_ewma_rate); | |
341 | return skb->len; | |
342 | ||
343 | rtattr_failure: | |
344 | nlmsg_trim(skb, b); | |
345 | return -1; | |
346 | } | |
347 | ||
348 | MODULE_AUTHOR("Alexey Kuznetsov"); | |
349 | MODULE_DESCRIPTION("Policing actions"); | |
350 | MODULE_LICENSE("GPL"); | |
351 | ||
352 | static struct tc_action_ops act_police_ops = { | |
353 | .kind = "police", | |
354 | .hinfo = &police_hash_info, | |
355 | .type = TCA_ID_POLICE, | |
356 | .capab = TCA_CAP_NONE, | |
357 | .owner = THIS_MODULE, | |
358 | .act = tcf_act_police, | |
359 | .dump = tcf_act_police_dump, | |
360 | .cleanup = tcf_act_police_cleanup, | |
361 | .lookup = tcf_hash_search, | |
362 | .init = tcf_act_police_locate, | |
363 | .walk = tcf_act_police_walker | |
364 | }; | |
365 | ||
366 | static int __init | |
367 | police_init_module(void) | |
368 | { | |
369 | return tcf_register_action(&act_police_ops); | |
370 | } | |
371 | ||
372 | static void __exit | |
373 | police_cleanup_module(void) | |
374 | { | |
375 | tcf_unregister_action(&act_police_ops); | |
376 | } | |
377 | ||
378 | module_init(police_init_module); | |
379 | module_exit(police_cleanup_module); |