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[NET_SCHED]: Propagate nla_parse return value
[linux-2.6/linux-loongson.git] / net / sched / act_police.c
blobc0fce9b984125acc0663dd66c947ddfae2bd818e
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 nlattr *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 nlattr *)skb_tail_pointer(skb);
73 NLA_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->nla_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 nla_put_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 nlattr *nla, struct nlattr *est,
122 struct tc_action *a, int ovr, int bind)
123 {
124 unsigned h;
125 int ret = 0, err;
126 struct nlattr *tb[TCA_POLICE_MAX + 1];
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 (nla == NULL)
133 return -EINVAL;
134
135 err = nla_parse_nested(tb, TCA_POLICE_MAX, nla, NULL);
136 if (err < 0)
137 return err;
138
139 if (tb[TCA_POLICE_TBF] == NULL)
140 return -EINVAL;
141 size = nla_len(tb[TCA_POLICE_TBF]);
142 if (size != sizeof(*parm) && size != sizeof(struct tc_police_compat))
143 return -EINVAL;
144 parm = nla_data(tb[TCA_POLICE_TBF]);
145
146 if (tb[TCA_POLICE_RESULT] != NULL &&
147 nla_len(tb[TCA_POLICE_RESULT]) != sizeof(u32))
148 return -EINVAL;
149 if (tb[TCA_POLICE_RESULT] != NULL &&
150 nla_len(tb[TCA_POLICE_RESULT]) != sizeof(u32))
151 return -EINVAL;
152
153 if (parm->index) {
154 struct tcf_common *pc;
155
156 pc = tcf_hash_lookup(parm->index, &police_hash_info);
157 if (pc != NULL) {
158 a->priv = pc;
159 police = to_police(pc);
160 if (bind) {
161 police->tcf_bindcnt += 1;
162 police->tcf_refcnt += 1;
163 }
164 if (ovr)
165 goto override;
166 return ret;
167 }
168 }
169
170 police = kzalloc(sizeof(*police), GFP_KERNEL);
171 if (police == NULL)
172 return -ENOMEM;
173 ret = ACT_P_CREATED;
174 police->tcf_refcnt = 1;
175 spin_lock_init(&police->tcf_lock);
176 if (bind)
177 police->tcf_bindcnt = 1;
178 override:
179 if (parm->rate.rate) {
180 err = -ENOMEM;
181 R_tab = qdisc_get_rtab(&parm->rate, tb[TCA_POLICE_RATE]);
182 if (R_tab == NULL)
183 goto failure;
184 if (parm->peakrate.rate) {
185 P_tab = qdisc_get_rtab(&parm->peakrate,
186 tb[TCA_POLICE_PEAKRATE]);
187 if (P_tab == NULL) {
188 qdisc_put_rtab(R_tab);
189 goto failure;
190 }
191 }
192 }
193 /* No failure allowed after this point */
194 spin_lock_bh(&police->tcf_lock);
195 if (R_tab != NULL) {
196 qdisc_put_rtab(police->tcfp_R_tab);
197 police->tcfp_R_tab = R_tab;
198 }
199 if (P_tab != NULL) {
200 qdisc_put_rtab(police->tcfp_P_tab);
201 police->tcfp_P_tab = P_tab;
202 }
203
204 if (tb[TCA_POLICE_RESULT])
205 police->tcfp_result = *(u32*)nla_data(tb[TCA_POLICE_RESULT]);
206 police->tcfp_toks = police->tcfp_burst = parm->burst;
207 police->tcfp_mtu = parm->mtu;
208 if (police->tcfp_mtu == 0) {
209 police->tcfp_mtu = ~0;
210 if (police->tcfp_R_tab)
211 police->tcfp_mtu = 255<<police->tcfp_R_tab->rate.cell_log;
212 }
213 if (police->tcfp_P_tab)
214 police->tcfp_ptoks = L2T_P(police, police->tcfp_mtu);
215 police->tcf_action = parm->action;
216
217 if (tb[TCA_POLICE_AVRATE])
218 police->tcfp_ewma_rate =
219 *(u32*)nla_data(tb[TCA_POLICE_AVRATE]);
220 if (est)
221 gen_replace_estimator(&police->tcf_bstats,
222 &police->tcf_rate_est,
223 &police->tcf_lock, est);
224
225 spin_unlock_bh(&police->tcf_lock);
226 if (ret != ACT_P_CREATED)
227 return ret;
228
229 police->tcfp_t_c = psched_get_time();
230 police->tcf_index = parm->index ? parm->index :
231 tcf_hash_new_index(&police_idx_gen, &police_hash_info);
232 h = tcf_hash(police->tcf_index, POL_TAB_MASK);
233 write_lock_bh(&police_lock);
234 police->tcf_next = tcf_police_ht[h];
235 tcf_police_ht[h] = &police->common;
236 write_unlock_bh(&police_lock);
237
238 a->priv = police;
239 return ret;
240
241 failure:
242 if (ret == ACT_P_CREATED)
243 kfree(police);
244 return err;
245 }
246
247 static int tcf_act_police_cleanup(struct tc_action *a, int bind)
248 {
249 struct tcf_police *p = a->priv;
250 int ret = 0;
251
252 if (p != NULL) {
253 if (bind)
254 p->tcf_bindcnt--;
255
256 p->tcf_refcnt--;
257 if (p->tcf_refcnt <= 0 && !p->tcf_bindcnt) {
258 tcf_police_destroy(p);
259 ret = 1;
260 }
261 }
262 return ret;
263 }
264
265 static int tcf_act_police(struct sk_buff *skb, struct tc_action *a,
266 struct tcf_result *res)
267 {
268 struct tcf_police *police = a->priv;
269 psched_time_t now;
270 long toks;
271 long ptoks = 0;
272
273 spin_lock(&police->tcf_lock);
274
275 police->tcf_bstats.bytes += skb->len;
276 police->tcf_bstats.packets++;
277
278 if (police->tcfp_ewma_rate &&
279 police->tcf_rate_est.bps >= police->tcfp_ewma_rate) {
280 police->tcf_qstats.overlimits++;
281 spin_unlock(&police->tcf_lock);
282 return police->tcf_action;
283 }
284
285 if (skb->len <= police->tcfp_mtu) {
286 if (police->tcfp_R_tab == NULL) {
287 spin_unlock(&police->tcf_lock);
288 return police->tcfp_result;
289 }
290
291 now = psched_get_time();
292 toks = psched_tdiff_bounded(now, police->tcfp_t_c,
293 police->tcfp_burst);
294 if (police->tcfp_P_tab) {
295 ptoks = toks + police->tcfp_ptoks;
296 if (ptoks > (long)L2T_P(police, police->tcfp_mtu))
297 ptoks = (long)L2T_P(police, police->tcfp_mtu);
298 ptoks -= L2T_P(police, skb->len);
299 }
300 toks += police->tcfp_toks;
301 if (toks > (long)police->tcfp_burst)
302 toks = police->tcfp_burst;
303 toks -= L2T(police, skb->len);
304 if ((toks|ptoks) >= 0) {
305 police->tcfp_t_c = now;
306 police->tcfp_toks = toks;
307 police->tcfp_ptoks = ptoks;
308 spin_unlock(&police->tcf_lock);
309 return police->tcfp_result;
310 }
311 }
312
313 police->tcf_qstats.overlimits++;
314 spin_unlock(&police->tcf_lock);
315 return police->tcf_action;
316 }
317
318 static int
319 tcf_act_police_dump(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
320 {
321 unsigned char *b = skb_tail_pointer(skb);
322 struct tcf_police *police = a->priv;
323 struct tc_police opt;
324
325 opt.index = police->tcf_index;
326 opt.action = police->tcf_action;
327 opt.mtu = police->tcfp_mtu;
328 opt.burst = police->tcfp_burst;
329 opt.refcnt = police->tcf_refcnt - ref;
330 opt.bindcnt = police->tcf_bindcnt - bind;
331 if (police->tcfp_R_tab)
332 opt.rate = police->tcfp_R_tab->rate;
333 else
334 memset(&opt.rate, 0, sizeof(opt.rate));
335 if (police->tcfp_P_tab)
336 opt.peakrate = police->tcfp_P_tab->rate;
337 else
338 memset(&opt.peakrate, 0, sizeof(opt.peakrate));
339 NLA_PUT(skb, TCA_POLICE_TBF, sizeof(opt), &opt);
340 if (police->tcfp_result)
341 NLA_PUT(skb, TCA_POLICE_RESULT, sizeof(int),
342 &police->tcfp_result);
343 if (police->tcfp_ewma_rate)
344 NLA_PUT(skb, TCA_POLICE_AVRATE, 4, &police->tcfp_ewma_rate);
345 return skb->len;
346
347 nla_put_failure:
348 nlmsg_trim(skb, b);
349 return -1;
350 }
351
352 MODULE_AUTHOR("Alexey Kuznetsov");
353 MODULE_DESCRIPTION("Policing actions");
354 MODULE_LICENSE("GPL");
355
356 static struct tc_action_ops act_police_ops = {
357 .kind = "police",
358 .hinfo = &police_hash_info,
359 .type = TCA_ID_POLICE,
360 .capab = TCA_CAP_NONE,
361 .owner = THIS_MODULE,
362 .act = tcf_act_police,
363 .dump = tcf_act_police_dump,
364 .cleanup = tcf_act_police_cleanup,
365 .lookup = tcf_hash_search,
366 .init = tcf_act_police_locate,
367 .walk = tcf_act_police_walker
368 };
369
370 static int __init
371 police_init_module(void)
372 {
373 return tcf_register_action(&act_police_ops);
374 }
375
376 static void __exit
377 police_cleanup_module(void)
378 {
379 tcf_unregister_action(&act_police_ops);
380 }
381
382 module_init(police_init_module);
383 module_exit(police_cleanup_module);
linux kernel for loongson