net/sched/act_police.c

   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 <asm/uaccess.h>
  14 #include <asm/system.h>
  15 #include <linux/bitops.h>
  16 #include <linux/module.h>
  17 #include <linux/types.h>
  18 #include <linux/kernel.h>
  19 #include <linux/string.h>
  20 #include <linux/mm.h>
  21 #include <linux/socket.h>
  22 #include <linux/sockios.h>
  23 #include <linux/in.h>
  24 #include <linux/errno.h>
  25 #include <linux/interrupt.h>
  26 #include <linux/netdevice.h>
  27 #include <linux/skbuff.h>
  28 #include <linux/module.h>
  29 #include <linux/rtnetlink.h>
  30 #include <linux/init.h>
  31 #include <net/sock.h>
  32 #include <net/act_api.h>
  33
  34 #define L2T(p,L)   ((p)->tcfp_R_tab->data[(L)>>(p)->tcfp_R_tab->rate.cell_log])
  35 #define L2T_P(p,L) ((p)->tcfp_P_tab->data[(L)>>(p)->tcfp_P_tab->rate.cell_log])
  36
  37 #define POL_TAB_MASK     15
  38 static struct tcf_common *tcf_police_ht[POL_TAB_MASK + 1];
  39 static u32 police_idx_gen;
  40 static DEFINE_RWLOCK(police_lock);
  41
  42 static struct tcf_hashinfo police_hash_info = {
  43         .htab   =       tcf_police_ht,
  44         .hmask  =       POL_TAB_MASK,
  45         .lock   =       &police_lock,
  46 };
  47
  48 /* old policer structure from before tc actions */
  49 struct tc_police_compat
  50 {
  51         u32                     index;
  52         int                     action;
  53         u32                     limit;
  54         u32                     burst;
  55         u32                     mtu;
  56         struct tc_ratespec      rate;
  57         struct tc_ratespec      peakrate;
  58 };
  59
  60 /* Each policer is serialized by its individual spinlock */
  61
  62 #ifdef CONFIG_NET_CLS_ACT
  63 static int tcf_act_police_walker(struct sk_buff *skb, struct netlink_callback *cb,
  64                               int type, struct tc_action *a)
  65 {
  66         struct tcf_common *p;
  67         int err = 0, index = -1, i = 0, s_i = 0, n_i = 0;
  68         struct rtattr *r;
  69
  70         read_lock(&police_lock);
  71
  72         s_i = cb->args[0];
  73
  74         for (i = 0; i < (POL_TAB_MASK + 1); i++) {
  75                 p = tcf_police_ht[tcf_hash(i, POL_TAB_MASK)];
  76
  77                 for (; p; p = p->tcfc_next) {
  78                         index++;
  79                         if (index < s_i)
  80                                 continue;
  81                         a->priv = p;
  82                         a->order = index;
  83                         r = (struct rtattr*) skb->tail;
  84                         RTA_PUT(skb, a->order, 0, NULL);
  85                         if (type == RTM_DELACTION)
  86                                 err = tcf_action_dump_1(skb, a, 0, 1);
  87                         else
  88                                 err = tcf_action_dump_1(skb, a, 0, 0);
  89                         if (err < 0) {
  90                                 index--;
  91                                 skb_trim(skb, (u8*)r - skb->data);
  92                                 goto done;
  93                         }
  94                         r->rta_len = skb->tail - (u8*)r;
  95                         n_i++;
  96                 }
  97         }
  98 done:
  99         read_unlock(&police_lock);
 100         if (n_i)
 101                 cb->args[0] += n_i;
 102         return n_i;
 103
 104 rtattr_failure:
 105         skb_trim(skb, (u8*)r - skb->data);
 106         goto done;
 107 }
 108 #endif
 109
 110 void tcf_police_destroy(struct tcf_police *p)
 111 {
 112         unsigned int h = tcf_hash(p->tcf_index, POL_TAB_MASK);
 113         struct tcf_common **p1p;
 114
 115         for (p1p = &tcf_police_ht[h]; *p1p; p1p = &(*p1p)->tcfc_next) {
 116                 if (*p1p == &p->common) {
 117                         write_lock_bh(&police_lock);
 118                         *p1p = p->tcf_next;
 119                         write_unlock_bh(&police_lock);
 120 #ifdef CONFIG_NET_ESTIMATOR
 121                         gen_kill_estimator(&p->tcf_bstats,
 122                                            &p->tcf_rate_est);
 123 #endif
 124                         if (p->tcfp_R_tab)
 125                                 qdisc_put_rtab(p->tcfp_R_tab);
 126                         if (p->tcfp_P_tab)
 127                                 qdisc_put_rtab(p->tcfp_P_tab);
 128                         kfree(p);
 129                         return;
 130                 }
 131         }
 132         BUG_TRAP(0);
 133 }
 134
 135 #ifdef CONFIG_NET_CLS_ACT
 136 static int tcf_act_police_locate(struct rtattr *rta, struct rtattr *est,
 137                                  struct tc_action *a, int ovr, int bind)
 138 {
 139         unsigned h;
 140         int ret = 0, err;
 141         struct rtattr *tb[TCA_POLICE_MAX];
 142         struct tc_police *parm;
 143         struct tcf_police *police;
 144         struct qdisc_rate_table *R_tab = NULL, *P_tab = NULL;
 145         int size;
 146
 147         if (rta == NULL || rtattr_parse_nested(tb, TCA_POLICE_MAX, rta) < 0)
 148                 return -EINVAL;
 149
 150         if (tb[TCA_POLICE_TBF-1] == NULL)
 151                 return -EINVAL;
 152         size = RTA_PAYLOAD(tb[TCA_POLICE_TBF-1]);
 153         if (size != sizeof(*parm) && size != sizeof(struct tc_police_compat))
 154                 return -EINVAL;
 155         parm = RTA_DATA(tb[TCA_POLICE_TBF-1]);
 156
 157         if (tb[TCA_POLICE_RESULT-1] != NULL &&
 158             RTA_PAYLOAD(tb[TCA_POLICE_RESULT-1]) != sizeof(u32))
 159                 return -EINVAL;
 160         if (tb[TCA_POLICE_RESULT-1] != NULL &&
 161             RTA_PAYLOAD(tb[TCA_POLICE_RESULT-1]) != sizeof(u32))
 162                 return -EINVAL;
 163
 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;
 178                 }
 179         }
 180
 181         police = kzalloc(sizeof(*police), GFP_KERNEL);
 182         if (police == NULL)
 183                 return -ENOMEM;
 184         ret = ACT_P_CREATED;
 185         police->tcf_refcnt = 1;
 186         spin_lock_init(&police->tcf_lock);
 187         police->tcf_stats_lock = &police->tcf_lock;
 188         if (bind)
 189                 police->tcf_bindcnt = 1;
 190 override:
 191         if (parm->rate.rate) {
 192                 err = -ENOMEM;
 193                 R_tab = qdisc_get_rtab(&parm->rate, tb[TCA_POLICE_RATE-1]);
 194                 if (R_tab == NULL)
 195                         goto failure;
 196                 if (parm->peakrate.rate) {
 197                         P_tab = qdisc_get_rtab(&parm->peakrate,
 198                                                tb[TCA_POLICE_PEAKRATE-1]);
 199                         if (P_tab == NULL) {
 200                                 qdisc_put_rtab(R_tab);
 201                                 goto failure;
 202                         }
 203                 }
 204         }
 205         /* No failure allowed after this point */
 206         spin_lock_bh(&police->tcf_lock);
 207         if (R_tab != NULL) {
 208                 qdisc_put_rtab(police->tcfp_R_tab);
 209                 police->tcfp_R_tab = R_tab;
 210         }
 211         if (P_tab != NULL) {
 212                 qdisc_put_rtab(police->tcfp_P_tab);
 213                 police->tcfp_P_tab = P_tab;
 214         }
 215
 216         if (tb[TCA_POLICE_RESULT-1])
 217                 police->tcfp_result = *(u32*)RTA_DATA(tb[TCA_POLICE_RESULT-1]);
 218         police->tcfp_toks = police->tcfp_burst = parm->burst;
 219         police->tcfp_mtu = parm->mtu;
 220         if (police->tcfp_mtu == 0) {
 221                 police->tcfp_mtu = ~0;
 222                 if (police->tcfp_R_tab)
 223                         police->tcfp_mtu = 255<<police->tcfp_R_tab->rate.cell_log;
 224         }
 225         if (police->tcfp_P_tab)
 226                 police->tcfp_ptoks = L2T_P(police, police->tcfp_mtu);
 227         police->tcf_action = parm->action;
 228
 229 #ifdef CONFIG_NET_ESTIMATOR
 230         if (tb[TCA_POLICE_AVRATE-1])
 231                 police->tcfp_ewma_rate =
 232                         *(u32*)RTA_DATA(tb[TCA_POLICE_AVRATE-1]);
 233         if (est)
 234                 gen_replace_estimator(&police->tcf_bstats,
 235                                       &police->tcf_rate_est,
 236                                       police->tcf_stats_lock, est);
 237 #endif
 238
 239         spin_unlock_bh(&police->tcf_lock);
 240         if (ret != ACT_P_CREATED)
 241                 return ret;
 242
 243         PSCHED_GET_TIME(police->tcfp_t_c);
 244         police->tcf_index = parm->index ? parm->index :
 245                 tcf_hash_new_index(&police_idx_gen, &police_hash_info);
 246         h = tcf_hash(police->tcf_index, POL_TAB_MASK);
 247         write_lock_bh(&police_lock);
 248         police->tcf_next = tcf_police_ht[h];
 249         tcf_police_ht[h] = &police->common;
 250         write_unlock_bh(&police_lock);
 251
 252         a->priv = police;
 253         return ret;
 254
 255 failure:
 256         if (ret == ACT_P_CREATED)
 257                 kfree(police);
 258         return err;
 259 }
 260
 261 static int tcf_act_police_cleanup(struct tc_action *a, int bind)
 262 {
 263         struct tcf_police *p = a->priv;
 264
 265         if (p != NULL)
 266                 return tcf_police_release(p, bind);
 267         return 0;
 268 }
 269
 270 static int tcf_act_police(struct sk_buff *skb, struct tc_action *a,
 271                           struct tcf_result *res)
 272 {
 273         struct tcf_police *police = a->priv;
 274         psched_time_t now;
 275         long toks;
 276         long ptoks = 0;
 277
 278         spin_lock(&police->tcf_lock);
 279
 280         police->tcf_bstats.bytes += skb->len;
 281         police->tcf_bstats.packets++;
 282
 283 #ifdef CONFIG_NET_ESTIMATOR
 284         if (police->tcfp_ewma_rate &&
 285             police->tcf_rate_est.bps >= police->tcfp_ewma_rate) {
 286                 police->tcf_qstats.overlimits++;
 287                 spin_unlock(&police->tcf_lock);
 288                 return police->tcf_action;
 289         }
 290 #endif
 291
 292         if (skb->len <= police->tcfp_mtu) {
 293                 if (police->tcfp_R_tab == NULL) {
 294                         spin_unlock(&police->tcf_lock);
 295                         return police->tcfp_result;
 296                 }
 297
 298                 PSCHED_GET_TIME(now);
 299
 300                 toks = PSCHED_TDIFF_SAFE(now, police->tcfp_t_c,
 301                                          police->tcfp_burst);
 302                 if (police->tcfp_P_tab) {
 303                         ptoks = toks + police->tcfp_ptoks;
 304                         if (ptoks > (long)L2T_P(police, police->tcfp_mtu))
 305                                 ptoks = (long)L2T_P(police, police->tcfp_mtu);
 306                         ptoks -= L2T_P(police, skb->len);
 307                 }
 308                 toks += police->tcfp_toks;
 309                 if (toks > (long)police->tcfp_burst)
 310                         toks = police->tcfp_burst;
 311                 toks -= L2T(police, skb->len);
 312                 if ((toks|ptoks) >= 0) {
 313                         police->tcfp_t_c = now;
 314                         police->tcfp_toks = toks;
 315                         police->tcfp_ptoks = ptoks;
 316                         spin_unlock(&police->tcf_lock);
 317                         return police->tcfp_result;
 318                 }
 319         }
 320
 321         police->tcf_qstats.overlimits++;
 322         spin_unlock(&police->tcf_lock);
 323         return police->tcf_action;
 324 }
 325
 326 static int
 327 tcf_act_police_dump(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
 328 {
 329         unsigned char    *b = skb->tail;
 330         struct tcf_police *police = a->priv;
 331         struct tc_police opt;
 332
 333         opt.index = police->tcf_index;
 334         opt.action = police->tcf_action;
 335         opt.mtu = police->tcfp_mtu;
 336         opt.burst = police->tcfp_burst;
 337         opt.refcnt = police->tcf_refcnt - ref;
 338         opt.bindcnt = police->tcf_bindcnt - bind;
 339         if (police->tcfp_R_tab)
 340                 opt.rate = police->tcfp_R_tab->rate;
 341         else
 342                 memset(&opt.rate, 0, sizeof(opt.rate));
 343         if (police->tcfp_P_tab)
 344                 opt.peakrate = police->tcfp_P_tab->rate;
 345         else
 346                 memset(&opt.peakrate, 0, sizeof(opt.peakrate));
 347         RTA_PUT(skb, TCA_POLICE_TBF, sizeof(opt), &opt);
 348         if (police->tcfp_result)
 349                 RTA_PUT(skb, TCA_POLICE_RESULT, sizeof(int),
 350                         &police->tcfp_result);
 351 #ifdef CONFIG_NET_ESTIMATOR
 352         if (police->tcfp_ewma_rate)
 353                 RTA_PUT(skb, TCA_POLICE_AVRATE, 4, &police->tcfp_ewma_rate);
 354 #endif
 355         return skb->len;
 356
 357 rtattr_failure:
 358         skb_trim(skb, b - skb->data);
 359         return -1;
 360 }
 361
 362 MODULE_AUTHOR("Alexey Kuznetsov");
 363 MODULE_DESCRIPTION("Policing actions");
 364 MODULE_LICENSE("GPL");
 365
 366 static struct tc_action_ops act_police_ops = {
 367         .kind           =       "police",
 368         .hinfo          =       &police_hash_info,
 369         .type           =       TCA_ID_POLICE,
 370         .capab          =       TCA_CAP_NONE,
 371         .owner          =       THIS_MODULE,
 372         .act            =       tcf_act_police,
 373         .dump           =       tcf_act_police_dump,
 374         .cleanup        =       tcf_act_police_cleanup,
 375         .lookup         =       tcf_hash_search,
 376         .init           =       tcf_act_police_locate,
 377         .walk           =       tcf_act_police_walker
 378 };
 379
 380 static int __init
 381 police_init_module(void)
 382 {
 383         return tcf_register_action(&act_police_ops);
 384 }
 385
 386 static void __exit
 387 police_cleanup_module(void)
 388 {
 389         tcf_unregister_action(&act_police_ops);
 390 }
 391
 392 module_init(police_init_module);
 393 module_exit(police_cleanup_module);
 394
 395 #else /* CONFIG_NET_CLS_ACT */
 396
 397 static struct tcf_common *tcf_police_lookup(u32 index)
 398 {
 399         struct tcf_hashinfo *hinfo = &police_hash_info;
 400         struct tcf_common *p;
 401
 402         read_lock(hinfo->lock);
 403         for (p = hinfo->htab[tcf_hash(index, hinfo->hmask)]; p;
 404              p = p->tcfc_next) {
 405                 if (p->tcfc_index == index)
 406                         break;
 407         }
 408         read_unlock(hinfo->lock);
 409
 410         return p;
 411 }
 412
 413 static u32 tcf_police_new_index(void)
 414 {
 415         u32 *idx_gen = &police_idx_gen;
 416         u32 val = *idx_gen;
 417
 418         do {
 419                 if (++val == 0)
 420                         val = 1;
 421         } while (tcf_police_lookup(val));
 422
 423         return (*idx_gen = val);
 424 }
 425
 426 struct tcf_police *tcf_police_locate(struct rtattr *rta, struct rtattr *est)
 427 {
 428         unsigned int h;
 429         struct tcf_police *police;
 430         struct rtattr *tb[TCA_POLICE_MAX];
 431         struct tc_police *parm;
 432         int size;
 433
 434         if (rtattr_parse_nested(tb, TCA_POLICE_MAX, rta) < 0)
 435                 return NULL;
 436
 437         if (tb[TCA_POLICE_TBF-1] == NULL)
 438                 return NULL;
 439         size = RTA_PAYLOAD(tb[TCA_POLICE_TBF-1]);
 440         if (size != sizeof(*parm) && size != sizeof(struct tc_police_compat))
 441                 return NULL;
 442
 443         parm = RTA_DATA(tb[TCA_POLICE_TBF-1]);
 444
 445         if (parm->index) {
 446                 struct tcf_common *pc;
 447
 448                 pc = tcf_police_lookup(parm->index);
 449                 if (pc) {
 450                         police = to_police(pc);
 451                         police->tcf_refcnt++;
 452                         return police;
 453                 }
 454         }
 455         police = kzalloc(sizeof(*police), GFP_KERNEL);
 456         if (unlikely(!police))
 457                 return NULL;
 458
 459         police->tcf_refcnt = 1;
 460         spin_lock_init(&police->tcf_lock);
 461         police->tcf_stats_lock = &police->tcf_lock;
 462         if (parm->rate.rate) {
 463                 police->tcfp_R_tab =
 464                         qdisc_get_rtab(&parm->rate, tb[TCA_POLICE_RATE-1]);
 465                 if (police->tcfp_R_tab == NULL)
 466                         goto failure;
 467                 if (parm->peakrate.rate) {
 468                         police->tcfp_P_tab =
 469                                 qdisc_get_rtab(&parm->peakrate,
 470                                                tb[TCA_POLICE_PEAKRATE-1]);
 471                         if (police->tcfp_P_tab == NULL)
 472                                 goto failure;
 473                 }
 474         }
 475         if (tb[TCA_POLICE_RESULT-1]) {
 476                 if (RTA_PAYLOAD(tb[TCA_POLICE_RESULT-1]) != sizeof(u32))
 477                         goto failure;
 478                 police->tcfp_result = *(u32*)RTA_DATA(tb[TCA_POLICE_RESULT-1]);
 479         }
 480 #ifdef CONFIG_NET_ESTIMATOR
 481         if (tb[TCA_POLICE_AVRATE-1]) {
 482                 if (RTA_PAYLOAD(tb[TCA_POLICE_AVRATE-1]) != sizeof(u32))
 483                         goto failure;
 484                 police->tcfp_ewma_rate =
 485                         *(u32*)RTA_DATA(tb[TCA_POLICE_AVRATE-1]);
 486         }
 487 #endif
 488         police->tcfp_toks = police->tcfp_burst = parm->burst;
 489         police->tcfp_mtu = parm->mtu;
 490         if (police->tcfp_mtu == 0) {
 491                 police->tcfp_mtu = ~0;
 492                 if (police->tcfp_R_tab)
 493                         police->tcfp_mtu = 255<<police->tcfp_R_tab->rate.cell_log;
 494         }
 495         if (police->tcfp_P_tab)
 496                 police->tcfp_ptoks = L2T_P(police, police->tcfp_mtu);
 497         PSCHED_GET_TIME(police->tcfp_t_c);
 498         police->tcf_index = parm->index ? parm->index :
 499                 tcf_police_new_index();
 500         police->tcf_action = parm->action;
 501 #ifdef CONFIG_NET_ESTIMATOR
 502         if (est)
 503                 gen_new_estimator(&police->tcf_bstats, &police->tcf_rate_est,
 504                                   police->tcf_stats_lock, est);
 505 #endif
 506         h = tcf_hash(police->tcf_index, POL_TAB_MASK);
 507         write_lock_bh(&police_lock);
 508         police->tcf_next = tcf_police_ht[h];
 509         tcf_police_ht[h] = &police->common;
 510         write_unlock_bh(&police_lock);
 511         return police;
 512
 513 failure:
 514         if (police->tcfp_R_tab)
 515                 qdisc_put_rtab(police->tcfp_R_tab);
 516         kfree(police);
 517         return NULL;
 518 }
 519
 520 int tcf_police(struct sk_buff *skb, struct tcf_police *police)
 521 {
 522         psched_time_t now;
 523         long toks;
 524         long ptoks = 0;
 525
 526         spin_lock(&police->tcf_lock);
 527
 528         police->tcf_bstats.bytes += skb->len;
 529         police->tcf_bstats.packets++;
 530
 531 #ifdef CONFIG_NET_ESTIMATOR
 532         if (police->tcfp_ewma_rate &&
 533             police->tcf_rate_est.bps >= police->tcfp_ewma_rate) {
 534                 police->tcf_qstats.overlimits++;
 535                 spin_unlock(&police->tcf_lock);
 536                 return police->tcf_action;
 537         }
 538 #endif
 539         if (skb->len <= police->tcfp_mtu) {
 540                 if (police->tcfp_R_tab == NULL) {
 541                         spin_unlock(&police->tcf_lock);
 542                         return police->tcfp_result;
 543                 }
 544
 545                 PSCHED_GET_TIME(now);
 546                 toks = PSCHED_TDIFF_SAFE(now, police->tcfp_t_c,
 547                                          police->tcfp_burst);
 548                 if (police->tcfp_P_tab) {
 549                         ptoks = toks + police->tcfp_ptoks;
 550                         if (ptoks > (long)L2T_P(police, police->tcfp_mtu))
 551                                 ptoks = (long)L2T_P(police, police->tcfp_mtu);
 552                         ptoks -= L2T_P(police, skb->len);
 553                 }
 554                 toks += police->tcfp_toks;
 555                 if (toks > (long)police->tcfp_burst)
 556                         toks = police->tcfp_burst;
 557                 toks -= L2T(police, skb->len);
 558                 if ((toks|ptoks) >= 0) {
 559                         police->tcfp_t_c = now;
 560                         police->tcfp_toks = toks;
 561                         police->tcfp_ptoks = ptoks;
 562                         spin_unlock(&police->tcf_lock);
 563                         return police->tcfp_result;
 564                 }
 565         }
 566
 567         police->tcf_qstats.overlimits++;
 568         spin_unlock(&police->tcf_lock);
 569         return police->tcf_action;
 570 }
 571 EXPORT_SYMBOL(tcf_police);
 572
 573 int tcf_police_dump(struct sk_buff *skb, struct tcf_police *police)
 574 {
 575         unsigned char *b = skb->tail;
 576         struct tc_police opt;
 577
 578         opt.index = police->tcf_index;
 579         opt.action = police->tcf_action;
 580         opt.mtu = police->tcfp_mtu;
 581         opt.burst = police->tcfp_burst;
 582         if (police->tcfp_R_tab)
 583                 opt.rate = police->tcfp_R_tab->rate;
 584         else
 585                 memset(&opt.rate, 0, sizeof(opt.rate));
 586         if (police->tcfp_P_tab)
 587                 opt.peakrate = police->tcfp_P_tab->rate;
 588         else
 589                 memset(&opt.peakrate, 0, sizeof(opt.peakrate));
 590         RTA_PUT(skb, TCA_POLICE_TBF, sizeof(opt), &opt);
 591         if (police->tcfp_result)
 592                 RTA_PUT(skb, TCA_POLICE_RESULT, sizeof(int),
 593                         &police->tcfp_result);
 594 #ifdef CONFIG_NET_ESTIMATOR
 595         if (police->tcfp_ewma_rate)
 596                 RTA_PUT(skb, TCA_POLICE_AVRATE, 4, &police->tcfp_ewma_rate);
 597 #endif
 598         return skb->len;
 599
 600 rtattr_failure:
 601         skb_trim(skb, b - skb->data);
 602         return -1;
 603 }
 604
 605 int tcf_police_dump_stats(struct sk_buff *skb, struct tcf_police *police)
 606 {
 607         struct gnet_dump d;
 608
 609         if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS,
 610                                          TCA_XSTATS, police->tcf_stats_lock,
 611                                          &d) < 0)
 612                 goto errout;
 613
 614         if (gnet_stats_copy_basic(&d, &police->tcf_bstats) < 0 ||
 615 #ifdef CONFIG_NET_ESTIMATOR
 616             gnet_stats_copy_rate_est(&d, &police->tcf_rate_est) < 0 ||
 617 #endif
 618             gnet_stats_copy_queue(&d, &police->tcf_qstats) < 0)
 619                 goto errout;
 620
 621         if (gnet_stats_finish_copy(&d) < 0)
 622                 goto errout;
 623
 624         return 0;
 625
 626 errout:
 627         return -1;
 628 }
 629
 630 #endif /* CONFIG_NET_CLS_ACT */