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 /* Each policer is serialized by its individual spinlock */
  50
  51 #ifdef CONFIG_NET_CLS_ACT
  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(&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;
  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                                 skb_trim(skb, (u8*)r - skb->data);
  81                                 goto done;
  82                         }
  83                         r->rta_len = skb->tail - (u8*)r;
  84                         n_i++;
  85                 }
  86         }
  87 done:
  88         read_unlock(&police_lock);
  89         if (n_i)
  90                 cb->args[0] += n_i;
  91         return n_i;
  92
  93 rtattr_failure:
  94         skb_trim(skb, (u8*)r - skb->data);
  95         goto done;
  96 }
  97 #endif
  98
  99 void tcf_police_destroy(struct tcf_police *p)
 100 {
 101         unsigned int h = tcf_hash(p->tcf_index, POL_TAB_MASK);
 102         struct tcf_common **p1p;
 103
 104         for (p1p = &tcf_police_ht[h]; *p1p; p1p = &(*p1p)->tcfc_next) {
 105                 if (*p1p == &p->common) {
 106                         write_lock_bh(&police_lock);
 107                         *p1p = p->tcf_next;
 108                         write_unlock_bh(&police_lock);
 109 #ifdef CONFIG_NET_ESTIMATOR
 110                         gen_kill_estimator(&p->tcf_bstats,
 111                                            &p->tcf_rate_est);
 112 #endif
 113                         if (p->tcfp_R_tab)
 114                                 qdisc_put_rtab(p->tcfp_R_tab);
 115                         if (p->tcfp_P_tab)
 116                                 qdisc_put_rtab(p->tcfp_P_tab);
 117                         kfree(p);
 118                         return;
 119                 }
 120         }
 121         BUG_TRAP(0);
 122 }
 123
 124 #ifdef CONFIG_NET_CLS_ACT
 125 static int tcf_act_police_locate(struct rtattr *rta, struct rtattr *est,
 126                                  struct tc_action *a, int ovr, int bind)
 127 {
 128         unsigned h;
 129         int ret = 0, err;
 130         struct rtattr *tb[TCA_POLICE_MAX];
 131         struct tc_police *parm;
 132         struct tcf_police *police;
 133         struct qdisc_rate_table *R_tab = NULL, *P_tab = NULL;
 134
 135         if (rta == NULL || rtattr_parse_nested(tb, TCA_POLICE_MAX, rta) < 0)
 136                 return -EINVAL;
 137
 138         if (tb[TCA_POLICE_TBF-1] == NULL ||
 139             RTA_PAYLOAD(tb[TCA_POLICE_TBF-1]) != sizeof(*parm))
 140                 return -EINVAL;
 141         parm = RTA_DATA(tb[TCA_POLICE_TBF-1]);
 142
 143         if (tb[TCA_POLICE_RESULT-1] != NULL &&
 144             RTA_PAYLOAD(tb[TCA_POLICE_RESULT-1]) != sizeof(u32))
 145                 return -EINVAL;
 146         if (tb[TCA_POLICE_RESULT-1] != NULL &&
 147             RTA_PAYLOAD(tb[TCA_POLICE_RESULT-1]) != sizeof(u32))
 148                 return -EINVAL;
 149
 150         if (parm->index) {
 151                 struct tcf_common *pc;
 152
 153                 pc = tcf_hash_lookup(parm->index, &police_hash_info);
 154                 if (pc != NULL) {
 155                         a->priv = pc;
 156                         police = to_police(pc);
 157                         if (bind) {
 158                                 police->tcf_bindcnt += 1;
 159                                 police->tcf_refcnt += 1;
 160                         }
 161                         if (ovr)
 162                                 goto override;
 163                         return ret;
 164                 }
 165         }
 166
 167         police = kzalloc(sizeof(*police), GFP_KERNEL);
 168         if (police == NULL)
 169                 return -ENOMEM;
 170         ret = ACT_P_CREATED;
 171         police->tcf_refcnt = 1;
 172         spin_lock_init(&police->tcf_lock);
 173         police->tcf_stats_lock = &police->tcf_lock;
 174         if (bind)
 175                 police->tcf_bindcnt = 1;
 176 override:
 177         if (parm->rate.rate) {
 178                 err = -ENOMEM;
 179                 R_tab = qdisc_get_rtab(&parm->rate, tb[TCA_POLICE_RATE-1]);
 180                 if (R_tab == NULL)
 181                         goto failure;
 182                 if (parm->peakrate.rate) {
 183                         P_tab = qdisc_get_rtab(&parm->peakrate,
 184                                                tb[TCA_POLICE_PEAKRATE-1]);
 185                         if (P_tab == NULL) {
 186                                 qdisc_put_rtab(R_tab);
 187                                 goto failure;
 188                         }
 189                 }
 190         }
 191         /* No failure allowed after this point */
 192         spin_lock_bh(&police->tcf_lock);
 193         if (R_tab != NULL) {
 194                 qdisc_put_rtab(police->tcfp_R_tab);
 195                 police->tcfp_R_tab = R_tab;
 196         }
 197         if (P_tab != NULL) {
 198                 qdisc_put_rtab(police->tcfp_P_tab);
 199                 police->tcfp_P_tab = P_tab;
 200         }
 201
 202         if (tb[TCA_POLICE_RESULT-1])
 203                 police->tcfp_result = *(u32*)RTA_DATA(tb[TCA_POLICE_RESULT-1]);
 204         police->tcfp_toks = police->tcfp_burst = parm->burst;
 205         police->tcfp_mtu = parm->mtu;
 206         if (police->tcfp_mtu == 0) {
 207                 police->tcfp_mtu = ~0;
 208                 if (police->tcfp_R_tab)
 209                         police->tcfp_mtu = 255<<police->tcfp_R_tab->rate.cell_log;
 210         }
 211         if (police->tcfp_P_tab)
 212                 police->tcfp_ptoks = L2T_P(police, police->tcfp_mtu);
 213         police->tcf_action = parm->action;
 214
 215 #ifdef CONFIG_NET_ESTIMATOR
 216         if (tb[TCA_POLICE_AVRATE-1])
 217                 police->tcfp_ewma_rate =
 218                         *(u32*)RTA_DATA(tb[TCA_POLICE_AVRATE-1]);
 219         if (est)
 220                 gen_replace_estimator(&police->tcf_bstats,
 221                                       &police->tcf_rate_est,
 222                                       police->tcf_stats_lock, est);
 223 #endif
 224
 225         spin_unlock_bh(&police->tcf_lock);
 226         if (ret != ACT_P_CREATED)
 227                 return ret;
 228
 229         PSCHED_GET_TIME(police->tcfp_t_c);
 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
 251         if (p != NULL)
 252                 return tcf_police_release(p, bind);
 253         return 0;
 254 }
 255
 256 static int tcf_act_police(struct sk_buff *skb, struct tc_action *a,
 257                           struct tcf_result *res)
 258 {
 259         struct tcf_police *police = a->priv;
 260         psched_time_t now;
 261         long toks;
 262         long ptoks = 0;
 263
 264         spin_lock(&police->tcf_lock);
 265
 266         police->tcf_bstats.bytes += skb->len;
 267         police->tcf_bstats.packets++;
 268
 269 #ifdef CONFIG_NET_ESTIMATOR
 270         if (police->tcfp_ewma_rate &&
 271             police->tcf_rate_est.bps >= police->tcfp_ewma_rate) {
 272                 police->tcf_qstats.overlimits++;
 273                 spin_unlock(&police->tcf_lock);
 274                 return police->tcf_action;
 275         }
 276 #endif
 277
 278         if (skb->len <= police->tcfp_mtu) {
 279                 if (police->tcfp_R_tab == NULL) {
 280                         spin_unlock(&police->tcf_lock);
 281                         return police->tcfp_result;
 282                 }
 283
 284                 PSCHED_GET_TIME(now);
 285
 286                 toks = PSCHED_TDIFF_SAFE(now, police->tcfp_t_c,
 287                                          police->tcfp_burst);
 288                 if (police->tcfp_P_tab) {
 289                         ptoks = toks + police->tcfp_ptoks;
 290                         if (ptoks > (long)L2T_P(police, police->tcfp_mtu))
 291                                 ptoks = (long)L2T_P(police, police->tcfp_mtu);
 292                         ptoks -= L2T_P(police, skb->len);
 293                 }
 294                 toks += police->tcfp_toks;
 295                 if (toks > (long)police->tcfp_burst)
 296                         toks = police->tcfp_burst;
 297                 toks -= L2T(police, skb->len);
 298                 if ((toks|ptoks) >= 0) {
 299                         police->tcfp_t_c = now;
 300                         police->tcfp_toks = toks;
 301                         police->tcfp_ptoks = ptoks;
 302                         spin_unlock(&police->tcf_lock);
 303                         return police->tcfp_result;
 304                 }
 305         }
 306
 307         police->tcf_qstats.overlimits++;
 308         spin_unlock(&police->tcf_lock);
 309         return police->tcf_action;
 310 }
 311
 312 static int
 313 tcf_act_police_dump(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
 314 {
 315         unsigned char    *b = skb->tail;
 316         struct tcf_police *police = a->priv;
 317         struct tc_police opt;
 318
 319         opt.index = police->tcf_index;
 320         opt.action = police->tcf_action;
 321         opt.mtu = police->tcfp_mtu;
 322         opt.burst = police->tcfp_burst;
 323         opt.refcnt = police->tcf_refcnt - ref;
 324         opt.bindcnt = police->tcf_bindcnt - bind;
 325         if (police->tcfp_R_tab)
 326                 opt.rate = police->tcfp_R_tab->rate;
 327         else
 328                 memset(&opt.rate, 0, sizeof(opt.rate));
 329         if (police->tcfp_P_tab)
 330                 opt.peakrate = police->tcfp_P_tab->rate;
 331         else
 332                 memset(&opt.peakrate, 0, sizeof(opt.peakrate));
 333         RTA_PUT(skb, TCA_POLICE_TBF, sizeof(opt), &opt);
 334         if (police->tcfp_result)
 335                 RTA_PUT(skb, TCA_POLICE_RESULT, sizeof(int),
 336                         &police->tcfp_result);
 337 #ifdef CONFIG_NET_ESTIMATOR
 338         if (police->tcfp_ewma_rate)
 339                 RTA_PUT(skb, TCA_POLICE_AVRATE, 4, &police->tcfp_ewma_rate);
 340 #endif
 341         return skb->len;
 342
 343 rtattr_failure:
 344         skb_trim(skb, b - skb->data);
 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);
 380
 381 #else /* CONFIG_NET_CLS_ACT */
 382
 383 static struct tcf_common *tcf_police_lookup(u32 index)
 384 {
 385         struct tcf_hashinfo *hinfo = &police_hash_info;
 386         struct tcf_common *p;
 387
 388         read_lock(hinfo->lock);
 389         for (p = hinfo->htab[tcf_hash(index, hinfo->hmask)]; p;
 390              p = p->tcfc_next) {
 391                 if (p->tcfc_index == index)
 392                         break;
 393         }
 394         read_unlock(hinfo->lock);
 395
 396         return p;
 397 }
 398
 399 static u32 tcf_police_new_index(void)
 400 {
 401         u32 *idx_gen = &police_idx_gen;
 402         u32 val = *idx_gen;
 403
 404         do {
 405                 if (++val == 0)
 406                         val = 1;
 407         } while (tcf_police_lookup(val));
 408
 409         return (*idx_gen = val);
 410 }
 411
 412 struct tcf_police *tcf_police_locate(struct rtattr *rta, struct rtattr *est)
 413 {
 414         unsigned int h;
 415         struct tcf_police *police;
 416         struct rtattr *tb[TCA_POLICE_MAX];
 417         struct tc_police *parm;
 418
 419         if (rtattr_parse_nested(tb, TCA_POLICE_MAX, rta) < 0)
 420                 return NULL;
 421
 422         if (tb[TCA_POLICE_TBF-1] == NULL ||
 423             RTA_PAYLOAD(tb[TCA_POLICE_TBF-1]) != sizeof(*parm))
 424                 return NULL;
 425
 426         parm = RTA_DATA(tb[TCA_POLICE_TBF-1]);
 427
 428         if (parm->index) {
 429                 struct tcf_common *pc;
 430
 431                 pc = tcf_police_lookup(parm->index);
 432                 if (pc) {
 433                         police = to_police(pc);
 434                         police->tcf_refcnt++;
 435                         return police;
 436                 }
 437         }
 438         police = kzalloc(sizeof(*police), GFP_KERNEL);
 439         if (unlikely(!police))
 440                 return NULL;
 441
 442         police->tcf_refcnt = 1;
 443         spin_lock_init(&police->tcf_lock);
 444         police->tcf_stats_lock = &police->tcf_lock;
 445         if (parm->rate.rate) {
 446                 police->tcfp_R_tab =
 447                         qdisc_get_rtab(&parm->rate, tb[TCA_POLICE_RATE-1]);
 448                 if (police->tcfp_R_tab == NULL)
 449                         goto failure;
 450                 if (parm->peakrate.rate) {
 451                         police->tcfp_P_tab =
 452                                 qdisc_get_rtab(&parm->peakrate,
 453                                                tb[TCA_POLICE_PEAKRATE-1]);
 454                         if (police->tcfp_P_tab == NULL)
 455                                 goto failure;
 456                 }
 457         }
 458         if (tb[TCA_POLICE_RESULT-1]) {
 459                 if (RTA_PAYLOAD(tb[TCA_POLICE_RESULT-1]) != sizeof(u32))
 460                         goto failure;
 461                 police->tcfp_result = *(u32*)RTA_DATA(tb[TCA_POLICE_RESULT-1]);
 462         }
 463 #ifdef CONFIG_NET_ESTIMATOR
 464         if (tb[TCA_POLICE_AVRATE-1]) {
 465                 if (RTA_PAYLOAD(tb[TCA_POLICE_AVRATE-1]) != sizeof(u32))
 466                         goto failure;
 467                 police->tcfp_ewma_rate =
 468                         *(u32*)RTA_DATA(tb[TCA_POLICE_AVRATE-1]);
 469         }
 470 #endif
 471         police->tcfp_toks = police->tcfp_burst = parm->burst;
 472         police->tcfp_mtu = parm->mtu;
 473         if (police->tcfp_mtu == 0) {
 474                 police->tcfp_mtu = ~0;
 475                 if (police->tcfp_R_tab)
 476                         police->tcfp_mtu = 255<<police->tcfp_R_tab->rate.cell_log;
 477         }
 478         if (police->tcfp_P_tab)
 479                 police->tcfp_ptoks = L2T_P(police, police->tcfp_mtu);
 480         PSCHED_GET_TIME(police->tcfp_t_c);
 481         police->tcf_index = parm->index ? parm->index :
 482                 tcf_police_new_index();
 483         police->tcf_action = parm->action;
 484 #ifdef CONFIG_NET_ESTIMATOR
 485         if (est)
 486                 gen_new_estimator(&police->tcf_bstats, &police->tcf_rate_est,
 487                                   police->tcf_stats_lock, est);
 488 #endif
 489         h = tcf_hash(police->tcf_index, POL_TAB_MASK);
 490         write_lock_bh(&police_lock);
 491         police->tcf_next = tcf_police_ht[h];
 492         tcf_police_ht[h] = &police->common;
 493         write_unlock_bh(&police_lock);
 494         return police;
 495
 496 failure:
 497         if (police->tcfp_R_tab)
 498                 qdisc_put_rtab(police->tcfp_R_tab);
 499         kfree(police);
 500         return NULL;
 501 }
 502
 503 int tcf_police(struct sk_buff *skb, struct tcf_police *police)
 504 {
 505         psched_time_t now;
 506         long toks;
 507         long ptoks = 0;
 508
 509         spin_lock(&police->tcf_lock);
 510
 511         police->tcf_bstats.bytes += skb->len;
 512         police->tcf_bstats.packets++;
 513
 514 #ifdef CONFIG_NET_ESTIMATOR
 515         if (police->tcfp_ewma_rate &&
 516             police->tcf_rate_est.bps >= police->tcfp_ewma_rate) {
 517                 police->tcf_qstats.overlimits++;
 518                 spin_unlock(&police->tcf_lock);
 519                 return police->tcf_action;
 520         }
 521 #endif
 522         if (skb->len <= police->tcfp_mtu) {
 523                 if (police->tcfp_R_tab == NULL) {
 524                         spin_unlock(&police->tcf_lock);
 525                         return police->tcfp_result;
 526                 }
 527
 528                 PSCHED_GET_TIME(now);
 529                 toks = PSCHED_TDIFF_SAFE(now, police->tcfp_t_c,
 530                                          police->tcfp_burst);
 531                 if (police->tcfp_P_tab) {
 532                         ptoks = toks + police->tcfp_ptoks;
 533                         if (ptoks > (long)L2T_P(police, police->tcfp_mtu))
 534                                 ptoks = (long)L2T_P(police, police->tcfp_mtu);
 535                         ptoks -= L2T_P(police, skb->len);
 536                 }
 537                 toks += police->tcfp_toks;
 538                 if (toks > (long)police->tcfp_burst)
 539                         toks = police->tcfp_burst;
 540                 toks -= L2T(police, skb->len);
 541                 if ((toks|ptoks) >= 0) {
 542                         police->tcfp_t_c = now;
 543                         police->tcfp_toks = toks;
 544                         police->tcfp_ptoks = ptoks;
 545                         spin_unlock(&police->tcf_lock);
 546                         return police->tcfp_result;
 547                 }
 548         }
 549
 550         police->tcf_qstats.overlimits++;
 551         spin_unlock(&police->tcf_lock);
 552         return police->tcf_action;
 553 }
 554 EXPORT_SYMBOL(tcf_police);
 555
 556 int tcf_police_dump(struct sk_buff *skb, struct tcf_police *police)
 557 {
 558         unsigned char *b = skb->tail;
 559         struct tc_police opt;
 560
 561         opt.index = police->tcf_index;
 562         opt.action = police->tcf_action;
 563         opt.mtu = police->tcfp_mtu;
 564         opt.burst = police->tcfp_burst;
 565         if (police->tcfp_R_tab)
 566                 opt.rate = police->tcfp_R_tab->rate;
 567         else
 568                 memset(&opt.rate, 0, sizeof(opt.rate));
 569         if (police->tcfp_P_tab)
 570                 opt.peakrate = police->tcfp_P_tab->rate;
 571         else
 572                 memset(&opt.peakrate, 0, sizeof(opt.peakrate));
 573         RTA_PUT(skb, TCA_POLICE_TBF, sizeof(opt), &opt);
 574         if (police->tcfp_result)
 575                 RTA_PUT(skb, TCA_POLICE_RESULT, sizeof(int),
 576                         &police->tcfp_result);
 577 #ifdef CONFIG_NET_ESTIMATOR
 578         if (police->tcfp_ewma_rate)
 579                 RTA_PUT(skb, TCA_POLICE_AVRATE, 4, &police->tcfp_ewma_rate);
 580 #endif
 581         return skb->len;
 582
 583 rtattr_failure:
 584         skb_trim(skb, b - skb->data);
 585         return -1;
 586 }
 587
 588 int tcf_police_dump_stats(struct sk_buff *skb, struct tcf_police *police)
 589 {
 590         struct gnet_dump d;
 591
 592         if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS,
 593                                          TCA_XSTATS, police->tcf_stats_lock,
 594                                          &d) < 0)
 595                 goto errout;
 596
 597         if (gnet_stats_copy_basic(&d, &police->tcf_bstats) < 0 ||
 598 #ifdef CONFIG_NET_ESTIMATOR
 599             gnet_stats_copy_rate_est(&d, &police->tcf_rate_est) < 0 ||
 600 #endif
 601             gnet_stats_copy_queue(&d, &police->tcf_qstats) < 0)
 602                 goto errout;
 603
 604         if (gnet_stats_finish_copy(&d) < 0)
 605                 goto errout;
 606
 607         return 0;
 608
 609 errout:
 610         return -1;
 611 }
 612
 613 #endif /* CONFIG_NET_CLS_ACT */