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/sched.h>
  20 #include <linux/string.h>
  21 #include <linux/mm.h>
  22 #include <linux/socket.h>
  23 #include <linux/sockios.h>
  24 #include <linux/in.h>
  25 #include <linux/errno.h>
  26 #include <linux/interrupt.h>
  27 #include <linux/netdevice.h>
  28 #include <linux/skbuff.h>
  29 #include <linux/module.h>
  30 #include <linux/rtnetlink.h>
  31 #include <linux/init.h>
  32 #include <net/sock.h>
  33 #include <net/act_api.h>
  34
  35 #define L2T(p,L)   ((p)->tcfp_R_tab->data[(L)>>(p)->tcfp_R_tab->rate.cell_log])
  36 #define L2T_P(p,L) ((p)->tcfp_P_tab->data[(L)>>(p)->tcfp_P_tab->rate.cell_log])
  37
  38 #define POL_TAB_MASK     15
  39 static struct tcf_common *tcf_police_ht[POL_TAB_MASK + 1];
  40 static u32 police_idx_gen;
  41 static DEFINE_RWLOCK(police_lock);
  42
  43 static struct tcf_hashinfo police_hash_info = {
  44         .htab   =       tcf_police_ht,
  45         .hmask  =       POL_TAB_MASK,
  46         .lock   =       &police_lock,
  47 };
  48
  49 /* old policer structure from before tc actions */
  50 struct tc_police_compat
  51 {
  52         u32                     index;
  53         int                     action;
  54         u32                     limit;
  55         u32                     burst;
  56         u32                     mtu;
  57         struct tc_ratespec      rate;
  58         struct tc_ratespec      peakrate;
  59 };
  60
  61 /* Each policer is serialized by its individual spinlock */
  62
  63 #ifdef CONFIG_NET_CLS_ACT
  64 static int tcf_act_police_walker(struct sk_buff *skb, struct netlink_callback *cb,
  65                               int type, struct tc_action *a)
  66 {
  67         struct tcf_common *p;
  68         int err = 0, index = -1, i = 0, s_i = 0, n_i = 0;
  69         struct rtattr *r;
  70
  71         read_lock(&police_lock);
  72
  73         s_i = cb->args[0];
  74
  75         for (i = 0; i < (POL_TAB_MASK + 1); i++) {
  76                 p = tcf_police_ht[tcf_hash(i, POL_TAB_MASK)];
  77
  78                 for (; p; p = p->tcfc_next) {
  79                         index++;
  80                         if (index < s_i)
  81                                 continue;
  82                         a->priv = p;
  83                         a->order = index;
  84                         r = (struct rtattr*) skb->tail;
  85                         RTA_PUT(skb, a->order, 0, NULL);
  86                         if (type == RTM_DELACTION)
  87                                 err = tcf_action_dump_1(skb, a, 0, 1);
  88                         else
  89                                 err = tcf_action_dump_1(skb, a, 0, 0);
  90                         if (err < 0) {
  91                                 index--;
  92                                 skb_trim(skb, (u8*)r - skb->data);
  93                                 goto done;
  94                         }
  95                         r->rta_len = skb->tail - (u8*)r;
  96                         n_i++;
  97                 }
  98         }
  99 done:
 100         read_unlock(&police_lock);
 101         if (n_i)
 102                 cb->args[0] += n_i;
 103         return n_i;
 104
 105 rtattr_failure:
 106         skb_trim(skb, (u8*)r - skb->data);
 107         goto done;
 108 }
 109 #endif
 110
 111 void tcf_police_destroy(struct tcf_police *p)
 112 {
 113         unsigned int h = tcf_hash(p->tcf_index, POL_TAB_MASK);
 114         struct tcf_common **p1p;
 115
 116         for (p1p = &tcf_police_ht[h]; *p1p; p1p = &(*p1p)->tcfc_next) {
 117                 if (*p1p == &p->common) {
 118                         write_lock_bh(&police_lock);
 119                         *p1p = p->tcf_next;
 120                         write_unlock_bh(&police_lock);
 121 #ifdef CONFIG_NET_ESTIMATOR
 122                         gen_kill_estimator(&p->tcf_bstats,
 123                                            &p->tcf_rate_est);
 124 #endif
 125                         if (p->tcfp_R_tab)
 126                                 qdisc_put_rtab(p->tcfp_R_tab);
 127                         if (p->tcfp_P_tab)
 128                                 qdisc_put_rtab(p->tcfp_P_tab);
 129                         kfree(p);
 130                         return;
 131                 }
 132         }
 133         BUG_TRAP(0);
 134 }
 135
 136 #ifdef CONFIG_NET_CLS_ACT
 137 static int tcf_act_police_locate(struct rtattr *rta, struct rtattr *est,
 138                                  struct tc_action *a, int ovr, int bind)
 139 {
 140         unsigned h;
 141         int ret = 0, err;
 142         struct rtattr *tb[TCA_POLICE_MAX];
 143         struct tc_police *parm;
 144         struct tcf_police *police;
 145         struct qdisc_rate_table *R_tab = NULL, *P_tab = NULL;
 146         int size;
 147
 148         if (rta == NULL || rtattr_parse_nested(tb, TCA_POLICE_MAX, rta) < 0)
 149                 return -EINVAL;
 150
 151         if (tb[TCA_POLICE_TBF-1] == NULL)
 152                 return -EINVAL;
 153         size = RTA_PAYLOAD(tb[TCA_POLICE_TBF-1]);
 154         if (size != sizeof(*parm) && size != sizeof(struct tc_police_compat))
 155                 return -EINVAL;
 156         parm = RTA_DATA(tb[TCA_POLICE_TBF-1]);
 157
 158         if (tb[TCA_POLICE_RESULT-1] != NULL &&
 159             RTA_PAYLOAD(tb[TCA_POLICE_RESULT-1]) != sizeof(u32))
 160                 return -EINVAL;
 161         if (tb[TCA_POLICE_RESULT-1] != NULL &&
 162             RTA_PAYLOAD(tb[TCA_POLICE_RESULT-1]) != sizeof(u32))
 163                 return -EINVAL;
 164
 165         if (parm->index) {
 166                 struct tcf_common *pc;
 167
 168                 pc = tcf_hash_lookup(parm->index, &police_hash_info);
 169                 if (pc != NULL) {
 170                         a->priv = pc;
 171                         police = to_police(pc);
 172                         if (bind) {
 173                                 police->tcf_bindcnt += 1;
 174                                 police->tcf_refcnt += 1;
 175                         }
 176                         if (ovr)
 177                                 goto override;
 178                         return ret;
 179                 }
 180         }
 181
 182         police = kzalloc(sizeof(*police), GFP_KERNEL);
 183         if (police == NULL)
 184                 return -ENOMEM;
 185         ret = ACT_P_CREATED;
 186         police->tcf_refcnt = 1;
 187         spin_lock_init(&police->tcf_lock);
 188         police->tcf_stats_lock = &police->tcf_lock;
 189         if (bind)
 190                 police->tcf_bindcnt = 1;
 191 override:
 192         if (parm->rate.rate) {
 193                 err = -ENOMEM;
 194                 R_tab = qdisc_get_rtab(&parm->rate, tb[TCA_POLICE_RATE-1]);
 195                 if (R_tab == NULL)
 196                         goto failure;
 197                 if (parm->peakrate.rate) {
 198                         P_tab = qdisc_get_rtab(&parm->peakrate,
 199                                                tb[TCA_POLICE_PEAKRATE-1]);
 200                         if (P_tab == NULL) {
 201                                 qdisc_put_rtab(R_tab);
 202                                 goto failure;
 203                         }
 204                 }
 205         }
 206         /* No failure allowed after this point */
 207         spin_lock_bh(&police->tcf_lock);
 208         if (R_tab != NULL) {
 209                 qdisc_put_rtab(police->tcfp_R_tab);
 210                 police->tcfp_R_tab = R_tab;
 211         }
 212         if (P_tab != NULL) {
 213                 qdisc_put_rtab(police->tcfp_P_tab);
 214                 police->tcfp_P_tab = P_tab;
 215         }
 216
 217         if (tb[TCA_POLICE_RESULT-1])
 218                 police->tcfp_result = *(u32*)RTA_DATA(tb[TCA_POLICE_RESULT-1]);
 219         police->tcfp_toks = police->tcfp_burst = parm->burst;
 220         police->tcfp_mtu = parm->mtu;
 221         if (police->tcfp_mtu == 0) {
 222                 police->tcfp_mtu = ~0;
 223                 if (police->tcfp_R_tab)
 224                         police->tcfp_mtu = 255<<police->tcfp_R_tab->rate.cell_log;
 225         }
 226         if (police->tcfp_P_tab)
 227                 police->tcfp_ptoks = L2T_P(police, police->tcfp_mtu);
 228         police->tcf_action = parm->action;
 229
 230 #ifdef CONFIG_NET_ESTIMATOR
 231         if (tb[TCA_POLICE_AVRATE-1])
 232                 police->tcfp_ewma_rate =
 233                         *(u32*)RTA_DATA(tb[TCA_POLICE_AVRATE-1]);
 234         if (est)
 235                 gen_replace_estimator(&police->tcf_bstats,
 236                                       &police->tcf_rate_est,
 237                                       police->tcf_stats_lock, est);
 238 #endif
 239
 240         spin_unlock_bh(&police->tcf_lock);
 241         if (ret != ACT_P_CREATED)
 242                 return ret;
 243
 244         PSCHED_GET_TIME(police->tcfp_t_c);
 245         police->tcf_index = parm->index ? parm->index :
 246                 tcf_hash_new_index(&police_idx_gen, &police_hash_info);
 247         h = tcf_hash(police->tcf_index, POL_TAB_MASK);
 248         write_lock_bh(&police_lock);
 249         police->tcf_next = tcf_police_ht[h];
 250         tcf_police_ht[h] = &police->common;
 251         write_unlock_bh(&police_lock);
 252
 253         a->priv = police;
 254         return ret;
 255
 256 failure:
 257         if (ret == ACT_P_CREATED)
 258                 kfree(police);
 259         return err;
 260 }
 261
 262 static int tcf_act_police_cleanup(struct tc_action *a, int bind)
 263 {
 264         struct tcf_police *p = a->priv;
 265
 266         if (p != NULL)
 267                 return tcf_police_release(p, bind);
 268         return 0;
 269 }
 270
 271 static int tcf_act_police(struct sk_buff *skb, struct tc_action *a,
 272                           struct tcf_result *res)
 273 {
 274         struct tcf_police *police = a->priv;
 275         psched_time_t now;
 276         long toks;
 277         long ptoks = 0;
 278
 279         spin_lock(&police->tcf_lock);
 280
 281         police->tcf_bstats.bytes += skb->len;
 282         police->tcf_bstats.packets++;
 283
 284 #ifdef CONFIG_NET_ESTIMATOR
 285         if (police->tcfp_ewma_rate &&
 286             police->tcf_rate_est.bps >= police->tcfp_ewma_rate) {
 287                 police->tcf_qstats.overlimits++;
 288                 spin_unlock(&police->tcf_lock);
 289                 return police->tcf_action;
 290         }
 291 #endif
 292
 293         if (skb->len <= police->tcfp_mtu) {
 294                 if (police->tcfp_R_tab == NULL) {
 295                         spin_unlock(&police->tcf_lock);
 296                         return police->tcfp_result;
 297                 }
 298
 299                 PSCHED_GET_TIME(now);
 300
 301                 toks = PSCHED_TDIFF_SAFE(now, police->tcfp_t_c,
 302                                          police->tcfp_burst);
 303                 if (police->tcfp_P_tab) {
 304                         ptoks = toks + police->tcfp_ptoks;
 305                         if (ptoks > (long)L2T_P(police, police->tcfp_mtu))
 306                                 ptoks = (long)L2T_P(police, police->tcfp_mtu);
 307                         ptoks -= L2T_P(police, skb->len);
 308                 }
 309                 toks += police->tcfp_toks;
 310                 if (toks > (long)police->tcfp_burst)
 311                         toks = police->tcfp_burst;
 312                 toks -= L2T(police, skb->len);
 313                 if ((toks|ptoks) >= 0) {
 314                         police->tcfp_t_c = now;
 315                         police->tcfp_toks = toks;
 316                         police->tcfp_ptoks = ptoks;
 317                         spin_unlock(&police->tcf_lock);
 318                         return police->tcfp_result;
 319                 }
 320         }
 321
 322         police->tcf_qstats.overlimits++;
 323         spin_unlock(&police->tcf_lock);
 324         return police->tcf_action;
 325 }
 326
 327 static int
 328 tcf_act_police_dump(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
 329 {
 330         unsigned char    *b = skb->tail;
 331         struct tcf_police *police = a->priv;
 332         struct tc_police opt;
 333
 334         opt.index = police->tcf_index;
 335         opt.action = police->tcf_action;
 336         opt.mtu = police->tcfp_mtu;
 337         opt.burst = police->tcfp_burst;
 338         opt.refcnt = police->tcf_refcnt - ref;
 339         opt.bindcnt = police->tcf_bindcnt - bind;
 340         if (police->tcfp_R_tab)
 341                 opt.rate = police->tcfp_R_tab->rate;
 342         else
 343                 memset(&opt.rate, 0, sizeof(opt.rate));
 344         if (police->tcfp_P_tab)
 345                 opt.peakrate = police->tcfp_P_tab->rate;
 346         else
 347                 memset(&opt.peakrate, 0, sizeof(opt.peakrate));
 348         RTA_PUT(skb, TCA_POLICE_TBF, sizeof(opt), &opt);
 349         if (police->tcfp_result)
 350                 RTA_PUT(skb, TCA_POLICE_RESULT, sizeof(int),
 351                         &police->tcfp_result);
 352 #ifdef CONFIG_NET_ESTIMATOR
 353         if (police->tcfp_ewma_rate)
 354                 RTA_PUT(skb, TCA_POLICE_AVRATE, 4, &police->tcfp_ewma_rate);
 355 #endif
 356         return skb->len;
 357
 358 rtattr_failure:
 359         skb_trim(skb, b - skb->data);
 360         return -1;
 361 }
 362
 363 MODULE_AUTHOR("Alexey Kuznetsov");
 364 MODULE_DESCRIPTION("Policing actions");
 365 MODULE_LICENSE("GPL");
 366
 367 static struct tc_action_ops act_police_ops = {
 368         .kind           =       "police",
 369         .hinfo          =       &police_hash_info,
 370         .type           =       TCA_ID_POLICE,
 371         .capab          =       TCA_CAP_NONE,
 372         .owner          =       THIS_MODULE,
 373         .act            =       tcf_act_police,
 374         .dump           =       tcf_act_police_dump,
 375         .cleanup        =       tcf_act_police_cleanup,
 376         .lookup         =       tcf_hash_search,
 377         .init           =       tcf_act_police_locate,
 378         .walk           =       tcf_act_police_walker
 379 };
 380
 381 static int __init
 382 police_init_module(void)
 383 {
 384         return tcf_register_action(&act_police_ops);
 385 }
 386
 387 static void __exit
 388 police_cleanup_module(void)
 389 {
 390         tcf_unregister_action(&act_police_ops);
 391 }
 392
 393 module_init(police_init_module);
 394 module_exit(police_cleanup_module);
 395
 396 #else /* CONFIG_NET_CLS_ACT */
 397
 398 static struct tcf_common *tcf_police_lookup(u32 index)
 399 {
 400         struct tcf_hashinfo *hinfo = &police_hash_info;
 401         struct tcf_common *p;
 402
 403         read_lock(hinfo->lock);
 404         for (p = hinfo->htab[tcf_hash(index, hinfo->hmask)]; p;
 405              p = p->tcfc_next) {
 406                 if (p->tcfc_index == index)
 407                         break;
 408         }
 409         read_unlock(hinfo->lock);
 410
 411         return p;
 412 }
 413
 414 static u32 tcf_police_new_index(void)
 415 {
 416         u32 *idx_gen = &police_idx_gen;
 417         u32 val = *idx_gen;
 418
 419         do {
 420                 if (++val == 0)
 421                         val = 1;
 422         } while (tcf_police_lookup(val));
 423
 424         return (*idx_gen = val);
 425 }
 426
 427 struct tcf_police *tcf_police_locate(struct rtattr *rta, struct rtattr *est)
 428 {
 429         unsigned int h;
 430         struct tcf_police *police;
 431         struct rtattr *tb[TCA_POLICE_MAX];
 432         struct tc_police *parm;
 433         int size;
 434
 435         if (rtattr_parse_nested(tb, TCA_POLICE_MAX, rta) < 0)
 436                 return NULL;
 437
 438         if (tb[TCA_POLICE_TBF-1] == NULL)
 439                 return NULL;
 440         size = RTA_PAYLOAD(tb[TCA_POLICE_TBF-1]);
 441         if (size != sizeof(*parm) && size != sizeof(struct tc_police_compat))
 442                 return NULL;
 443
 444         parm = RTA_DATA(tb[TCA_POLICE_TBF-1]);
 445
 446         if (parm->index) {
 447                 struct tcf_common *pc;
 448
 449                 pc = tcf_police_lookup(parm->index);
 450                 if (pc) {
 451                         police = to_police(pc);
 452                         police->tcf_refcnt++;
 453                         return police;
 454                 }
 455         }
 456         police = kzalloc(sizeof(*police), GFP_KERNEL);
 457         if (unlikely(!police))
 458                 return NULL;
 459
 460         police->tcf_refcnt = 1;
 461         spin_lock_init(&police->tcf_lock);
 462         police->tcf_stats_lock = &police->tcf_lock;
 463         if (parm->rate.rate) {
 464                 police->tcfp_R_tab =
 465                         qdisc_get_rtab(&parm->rate, tb[TCA_POLICE_RATE-1]);
 466                 if (police->tcfp_R_tab == NULL)
 467                         goto failure;
 468                 if (parm->peakrate.rate) {
 469                         police->tcfp_P_tab =
 470                                 qdisc_get_rtab(&parm->peakrate,
 471                                                tb[TCA_POLICE_PEAKRATE-1]);
 472                         if (police->tcfp_P_tab == NULL)
 473                                 goto failure;
 474                 }
 475         }
 476         if (tb[TCA_POLICE_RESULT-1]) {
 477                 if (RTA_PAYLOAD(tb[TCA_POLICE_RESULT-1]) != sizeof(u32))
 478                         goto failure;
 479                 police->tcfp_result = *(u32*)RTA_DATA(tb[TCA_POLICE_RESULT-1]);
 480         }
 481 #ifdef CONFIG_NET_ESTIMATOR
 482         if (tb[TCA_POLICE_AVRATE-1]) {
 483                 if (RTA_PAYLOAD(tb[TCA_POLICE_AVRATE-1]) != sizeof(u32))
 484                         goto failure;
 485                 police->tcfp_ewma_rate =
 486                         *(u32*)RTA_DATA(tb[TCA_POLICE_AVRATE-1]);
 487         }
 488 #endif
 489         police->tcfp_toks = police->tcfp_burst = parm->burst;
 490         police->tcfp_mtu = parm->mtu;
 491         if (police->tcfp_mtu == 0) {
 492                 police->tcfp_mtu = ~0;
 493                 if (police->tcfp_R_tab)
 494                         police->tcfp_mtu = 255<<police->tcfp_R_tab->rate.cell_log;
 495         }
 496         if (police->tcfp_P_tab)
 497                 police->tcfp_ptoks = L2T_P(police, police->tcfp_mtu);
 498         PSCHED_GET_TIME(police->tcfp_t_c);
 499         police->tcf_index = parm->index ? parm->index :
 500                 tcf_police_new_index();
 501         police->tcf_action = parm->action;
 502 #ifdef CONFIG_NET_ESTIMATOR
 503         if (est)
 504                 gen_new_estimator(&police->tcf_bstats, &police->tcf_rate_est,
 505                                   police->tcf_stats_lock, est);
 506 #endif
 507         h = tcf_hash(police->tcf_index, POL_TAB_MASK);
 508         write_lock_bh(&police_lock);
 509         police->tcf_next = tcf_police_ht[h];
 510         tcf_police_ht[h] = &police->common;
 511         write_unlock_bh(&police_lock);
 512         return police;
 513
 514 failure:
 515         if (police->tcfp_R_tab)
 516                 qdisc_put_rtab(police->tcfp_R_tab);
 517         kfree(police);
 518         return NULL;
 519 }
 520
 521 int tcf_police(struct sk_buff *skb, struct tcf_police *police)
 522 {
 523         psched_time_t now;
 524         long toks;
 525         long ptoks = 0;
 526
 527         spin_lock(&police->tcf_lock);
 528
 529         police->tcf_bstats.bytes += skb->len;
 530         police->tcf_bstats.packets++;
 531
 532 #ifdef CONFIG_NET_ESTIMATOR
 533         if (police->tcfp_ewma_rate &&
 534             police->tcf_rate_est.bps >= police->tcfp_ewma_rate) {
 535                 police->tcf_qstats.overlimits++;
 536                 spin_unlock(&police->tcf_lock);
 537                 return police->tcf_action;
 538         }
 539 #endif
 540         if (skb->len <= police->tcfp_mtu) {
 541                 if (police->tcfp_R_tab == NULL) {
 542                         spin_unlock(&police->tcf_lock);
 543                         return police->tcfp_result;
 544                 }
 545
 546                 PSCHED_GET_TIME(now);
 547                 toks = PSCHED_TDIFF_SAFE(now, police->tcfp_t_c,
 548                                          police->tcfp_burst);
 549                 if (police->tcfp_P_tab) {
 550                         ptoks = toks + police->tcfp_ptoks;
 551                         if (ptoks > (long)L2T_P(police, police->tcfp_mtu))
 552                                 ptoks = (long)L2T_P(police, police->tcfp_mtu);
 553                         ptoks -= L2T_P(police, skb->len);
 554                 }
 555                 toks += police->tcfp_toks;
 556                 if (toks > (long)police->tcfp_burst)
 557                         toks = police->tcfp_burst;
 558                 toks -= L2T(police, skb->len);
 559                 if ((toks|ptoks) >= 0) {
 560                         police->tcfp_t_c = now;
 561                         police->tcfp_toks = toks;
 562                         police->tcfp_ptoks = ptoks;
 563                         spin_unlock(&police->tcf_lock);
 564                         return police->tcfp_result;
 565                 }
 566         }
 567
 568         police->tcf_qstats.overlimits++;
 569         spin_unlock(&police->tcf_lock);
 570         return police->tcf_action;
 571 }
 572 EXPORT_SYMBOL(tcf_police);
 573
 574 int tcf_police_dump(struct sk_buff *skb, struct tcf_police *police)
 575 {
 576         unsigned char *b = skb->tail;
 577         struct tc_police opt;
 578
 579         opt.index = police->tcf_index;
 580         opt.action = police->tcf_action;
 581         opt.mtu = police->tcfp_mtu;
 582         opt.burst = police->tcfp_burst;
 583         if (police->tcfp_R_tab)
 584                 opt.rate = police->tcfp_R_tab->rate;
 585         else
 586                 memset(&opt.rate, 0, sizeof(opt.rate));
 587         if (police->tcfp_P_tab)
 588                 opt.peakrate = police->tcfp_P_tab->rate;
 589         else
 590                 memset(&opt.peakrate, 0, sizeof(opt.peakrate));
 591         RTA_PUT(skb, TCA_POLICE_TBF, sizeof(opt), &opt);
 592         if (police->tcfp_result)
 593                 RTA_PUT(skb, TCA_POLICE_RESULT, sizeof(int),
 594                         &police->tcfp_result);
 595 #ifdef CONFIG_NET_ESTIMATOR
 596         if (police->tcfp_ewma_rate)
 597                 RTA_PUT(skb, TCA_POLICE_AVRATE, 4, &police->tcfp_ewma_rate);
 598 #endif
 599         return skb->len;
 600
 601 rtattr_failure:
 602         skb_trim(skb, b - skb->data);
 603         return -1;
 604 }
 605
 606 int tcf_police_dump_stats(struct sk_buff *skb, struct tcf_police *police)
 607 {
 608         struct gnet_dump d;
 609
 610         if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS,
 611                                          TCA_XSTATS, police->tcf_stats_lock,
 612                                          &d) < 0)
 613                 goto errout;
 614
 615         if (gnet_stats_copy_basic(&d, &police->tcf_bstats) < 0 ||
 616 #ifdef CONFIG_NET_ESTIMATOR
 617             gnet_stats_copy_rate_est(&d, &police->tcf_rate_est) < 0 ||
 618 #endif
 619             gnet_stats_copy_queue(&d, &police->tcf_qstats) < 0)
 620                 goto errout;
 621
 622         if (gnet_stats_finish_copy(&d) < 0)
 623                 goto errout;
 624
 625         return 0;
 626
 627 errout:
 628         return -1;
 629 }
 630
 631 #endif /* CONFIG_NET_CLS_ACT */