net/sched/act_gate.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /* Copyright 2020 NXP */
   3
   4 #include <linux/module.h>
   5 #include <linux/types.h>
   6 #include <linux/kernel.h>
   7 #include <linux/string.h>
   8 #include <linux/errno.h>
   9 #include <linux/skbuff.h>
  10 #include <linux/rtnetlink.h>
  11 #include <linux/init.h>
  12 #include <linux/slab.h>
  13 #include <net/act_api.h>
  14 #include <net/netlink.h>
  15 #include <net/pkt_cls.h>
  16 #include <net/tc_act/tc_gate.h>
  17 #include <net/tc_wrapper.h>
  18
  19 static struct tc_action_ops act_gate_ops;
  20
  21 static ktime_t gate_get_time(struct tcf_gate *gact)
  22 {
  23         ktime_t mono = ktime_get();
  24
  25         switch (gact->tk_offset) {
  26         case TK_OFFS_MAX:
  27                 return mono;
  28         default:
  29                 return ktime_mono_to_any(mono, gact->tk_offset);
  30         }
  31
  32         return KTIME_MAX;
  33 }
  34
  35 static void gate_get_start_time(struct tcf_gate *gact, ktime_t *start)
  36 {
  37         struct tcf_gate_params *param = &gact->param;
  38         ktime_t now, base, cycle;
  39         u64 n;
  40
  41         base = ns_to_ktime(param->tcfg_basetime);
  42         now = gate_get_time(gact);
  43
  44         if (ktime_after(base, now)) {
  45                 *start = base;
  46                 return;
  47         }
  48
  49         cycle = param->tcfg_cycletime;
  50
  51         n = div64_u64(ktime_sub_ns(now, base), cycle);
  52         *start = ktime_add_ns(base, (n + 1) * cycle);
  53 }
  54
  55 static void gate_start_timer(struct tcf_gate *gact, ktime_t start)
  56 {
  57         ktime_t expires;
  58
  59         expires = hrtimer_get_expires(&gact->hitimer);
  60         if (expires == 0)
  61                 expires = KTIME_MAX;
  62
  63         start = min_t(ktime_t, start, expires);
  64
  65         hrtimer_start(&gact->hitimer, start, HRTIMER_MODE_ABS_SOFT);
  66 }
  67
  68 static enum hrtimer_restart gate_timer_func(struct hrtimer *timer)
  69 {
  70         struct tcf_gate *gact = container_of(timer, struct tcf_gate,
  71                                              hitimer);
  72         struct tcf_gate_params *p = &gact->param;
  73         struct tcfg_gate_entry *next;
  74         ktime_t close_time, now;
  75
  76         spin_lock(&gact->tcf_lock);
  77
  78         next = gact->next_entry;
  79
  80         /* cycle start, clear pending bit, clear total octets */
  81         gact->current_gate_status = next->gate_state ? GATE_ACT_GATE_OPEN : 0;
  82         gact->current_entry_octets = 0;
  83         gact->current_max_octets = next->maxoctets;
  84
  85         gact->current_close_time = ktime_add_ns(gact->current_close_time,
  86                                                 next->interval);
  87
  88         close_time = gact->current_close_time;
  89
  90         if (list_is_last(&next->list, &p->entries))
  91                 next = list_first_entry(&p->entries,
  92                                         struct tcfg_gate_entry, list);
  93         else
  94                 next = list_next_entry(next, list);
  95
  96         now = gate_get_time(gact);
  97
  98         if (ktime_after(now, close_time)) {
  99                 ktime_t cycle, base;
 100                 u64 n;
 101
 102                 cycle = p->tcfg_cycletime;
 103                 base = ns_to_ktime(p->tcfg_basetime);
 104                 n = div64_u64(ktime_sub_ns(now, base), cycle);
 105                 close_time = ktime_add_ns(base, (n + 1) * cycle);
 106         }
 107
 108         gact->next_entry = next;
 109
 110         hrtimer_set_expires(&gact->hitimer, close_time);
 111
 112         spin_unlock(&gact->tcf_lock);
 113
 114         return HRTIMER_RESTART;
 115 }
 116
 117 TC_INDIRECT_SCOPE int tcf_gate_act(struct sk_buff *skb,
 118                                    const struct tc_action *a,
 119                                    struct tcf_result *res)
 120 {
 121         struct tcf_gate *gact = to_gate(a);
 122         int action = READ_ONCE(gact->tcf_action);
 123
 124         tcf_lastuse_update(&gact->tcf_tm);
 125         tcf_action_update_bstats(&gact->common, skb);
 126
 127         spin_lock(&gact->tcf_lock);
 128         if (unlikely(gact->current_gate_status & GATE_ACT_PENDING)) {
 129                 spin_unlock(&gact->tcf_lock);
 130                 return action;
 131         }
 132
 133         if (!(gact->current_gate_status & GATE_ACT_GATE_OPEN)) {
 134                 spin_unlock(&gact->tcf_lock);
 135                 goto drop;
 136         }
 137
 138         if (gact->current_max_octets >= 0) {
 139                 gact->current_entry_octets += qdisc_pkt_len(skb);
 140                 if (gact->current_entry_octets > gact->current_max_octets) {
 141                         spin_unlock(&gact->tcf_lock);
 142                         goto overlimit;
 143                 }
 144         }
 145         spin_unlock(&gact->tcf_lock);
 146
 147         return action;
 148
 149 overlimit:
 150         tcf_action_inc_overlimit_qstats(&gact->common);
 151 drop:
 152         tcf_action_inc_drop_qstats(&gact->common);
 153         return TC_ACT_SHOT;
 154 }
 155
 156 static const struct nla_policy entry_policy[TCA_GATE_ENTRY_MAX + 1] = {
 157         [TCA_GATE_ENTRY_INDEX]          = { .type = NLA_U32 },
 158         [TCA_GATE_ENTRY_GATE]           = { .type = NLA_FLAG },
 159         [TCA_GATE_ENTRY_INTERVAL]       = { .type = NLA_U32 },
 160         [TCA_GATE_ENTRY_IPV]            = { .type = NLA_S32 },
 161         [TCA_GATE_ENTRY_MAX_OCTETS]     = { .type = NLA_S32 },
 162 };
 163
 164 static const struct nla_policy gate_policy[TCA_GATE_MAX + 1] = {
 165         [TCA_GATE_PARMS]                =
 166                 NLA_POLICY_EXACT_LEN(sizeof(struct tc_gate)),
 167         [TCA_GATE_PRIORITY]             = { .type = NLA_S32 },
 168         [TCA_GATE_ENTRY_LIST]           = { .type = NLA_NESTED },
 169         [TCA_GATE_BASE_TIME]            = { .type = NLA_U64 },
 170         [TCA_GATE_CYCLE_TIME]           = { .type = NLA_U64 },
 171         [TCA_GATE_CYCLE_TIME_EXT]       = { .type = NLA_U64 },
 172         [TCA_GATE_FLAGS]                = { .type = NLA_U32 },
 173         [TCA_GATE_CLOCKID]              = { .type = NLA_S32 },
 174 };
 175
 176 static int fill_gate_entry(struct nlattr **tb, struct tcfg_gate_entry *entry,
 177                            struct netlink_ext_ack *extack)
 178 {
 179         u32 interval = 0;
 180
 181         entry->gate_state = nla_get_flag(tb[TCA_GATE_ENTRY_GATE]);
 182
 183         if (tb[TCA_GATE_ENTRY_INTERVAL])
 184                 interval = nla_get_u32(tb[TCA_GATE_ENTRY_INTERVAL]);
 185
 186         if (interval == 0) {
 187                 NL_SET_ERR_MSG(extack, "Invalid interval for schedule entry");
 188                 return -EINVAL;
 189         }
 190
 191         entry->interval = interval;
 192
 193         entry->ipv = nla_get_s32_default(tb[TCA_GATE_ENTRY_IPV], -1);
 194
 195         entry->maxoctets = nla_get_s32_default(tb[TCA_GATE_ENTRY_MAX_OCTETS],
 196                                                -1);
 197
 198         return 0;
 199 }
 200
 201 static int parse_gate_entry(struct nlattr *n, struct  tcfg_gate_entry *entry,
 202                             int index, struct netlink_ext_ack *extack)
 203 {
 204         struct nlattr *tb[TCA_GATE_ENTRY_MAX + 1] = { };
 205         int err;
 206
 207         err = nla_parse_nested(tb, TCA_GATE_ENTRY_MAX, n, entry_policy, extack);
 208         if (err < 0) {
 209                 NL_SET_ERR_MSG(extack, "Could not parse nested entry");
 210                 return -EINVAL;
 211         }
 212
 213         entry->index = index;
 214
 215         return fill_gate_entry(tb, entry, extack);
 216 }
 217
 218 static void release_entry_list(struct list_head *entries)
 219 {
 220         struct tcfg_gate_entry *entry, *e;
 221
 222         list_for_each_entry_safe(entry, e, entries, list) {
 223                 list_del(&entry->list);
 224                 kfree(entry);
 225         }
 226 }
 227
 228 static int parse_gate_list(struct nlattr *list_attr,
 229                            struct tcf_gate_params *sched,
 230                            struct netlink_ext_ack *extack)
 231 {
 232         struct tcfg_gate_entry *entry;
 233         struct nlattr *n;
 234         int err, rem;
 235         int i = 0;
 236
 237         if (!list_attr)
 238                 return -EINVAL;
 239
 240         nla_for_each_nested(n, list_attr, rem) {
 241                 if (nla_type(n) != TCA_GATE_ONE_ENTRY) {
 242                         NL_SET_ERR_MSG(extack, "Attribute isn't type 'entry'");
 243                         continue;
 244                 }
 245
 246                 entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
 247                 if (!entry) {
 248                         NL_SET_ERR_MSG(extack, "Not enough memory for entry");
 249                         err = -ENOMEM;
 250                         goto release_list;
 251                 }
 252
 253                 err = parse_gate_entry(n, entry, i, extack);
 254                 if (err < 0) {
 255                         kfree(entry);
 256                         goto release_list;
 257                 }
 258
 259                 list_add_tail(&entry->list, &sched->entries);
 260                 i++;
 261         }
 262
 263         sched->num_entries = i;
 264
 265         return i;
 266
 267 release_list:
 268         release_entry_list(&sched->entries);
 269
 270         return err;
 271 }
 272
 273 static void gate_setup_timer(struct tcf_gate *gact, u64 basetime,
 274                              enum tk_offsets tko, s32 clockid,
 275                              bool do_init)
 276 {
 277         if (!do_init) {
 278                 if (basetime == gact->param.tcfg_basetime &&
 279                     tko == gact->tk_offset &&
 280                     clockid == gact->param.tcfg_clockid)
 281                         return;
 282
 283                 spin_unlock_bh(&gact->tcf_lock);
 284                 hrtimer_cancel(&gact->hitimer);
 285                 spin_lock_bh(&gact->tcf_lock);
 286         }
 287         gact->param.tcfg_basetime = basetime;
 288         gact->param.tcfg_clockid = clockid;
 289         gact->tk_offset = tko;
 290         hrtimer_init(&gact->hitimer, clockid, HRTIMER_MODE_ABS_SOFT);
 291         gact->hitimer.function = gate_timer_func;
 292 }
 293
 294 static int tcf_gate_init(struct net *net, struct nlattr *nla,
 295                          struct nlattr *est, struct tc_action **a,
 296                          struct tcf_proto *tp, u32 flags,
 297                          struct netlink_ext_ack *extack)
 298 {
 299         struct tc_action_net *tn = net_generic(net, act_gate_ops.net_id);
 300         enum tk_offsets tk_offset = TK_OFFS_TAI;
 301         bool bind = flags & TCA_ACT_FLAGS_BIND;
 302         struct nlattr *tb[TCA_GATE_MAX + 1];
 303         struct tcf_chain *goto_ch = NULL;
 304         u64 cycletime = 0, basetime = 0;
 305         struct tcf_gate_params *p;
 306         s32 clockid = CLOCK_TAI;
 307         struct tcf_gate *gact;
 308         struct tc_gate *parm;
 309         int ret = 0, err;
 310         u32 gflags = 0;
 311         s32 prio = -1;
 312         ktime_t start;
 313         u32 index;
 314
 315         if (!nla)
 316                 return -EINVAL;
 317
 318         err = nla_parse_nested(tb, TCA_GATE_MAX, nla, gate_policy, extack);
 319         if (err < 0)
 320                 return err;
 321
 322         if (!tb[TCA_GATE_PARMS])
 323                 return -EINVAL;
 324
 325         if (tb[TCA_GATE_CLOCKID]) {
 326                 clockid = nla_get_s32(tb[TCA_GATE_CLOCKID]);
 327                 switch (clockid) {
 328                 case CLOCK_REALTIME:
 329                         tk_offset = TK_OFFS_REAL;
 330                         break;
 331                 case CLOCK_MONOTONIC:
 332                         tk_offset = TK_OFFS_MAX;
 333                         break;
 334                 case CLOCK_BOOTTIME:
 335                         tk_offset = TK_OFFS_BOOT;
 336                         break;
 337                 case CLOCK_TAI:
 338                         tk_offset = TK_OFFS_TAI;
 339                         break;
 340                 default:
 341                         NL_SET_ERR_MSG(extack, "Invalid 'clockid'");
 342                         return -EINVAL;
 343                 }
 344         }
 345
 346         parm = nla_data(tb[TCA_GATE_PARMS]);
 347         index = parm->index;
 348
 349         err = tcf_idr_check_alloc(tn, &index, a, bind);
 350         if (err < 0)
 351                 return err;
 352
 353         if (err && bind)
 354                 return ACT_P_BOUND;
 355
 356         if (!err) {
 357                 ret = tcf_idr_create_from_flags(tn, index, est, a,
 358                                                 &act_gate_ops, bind, flags);
 359                 if (ret) {
 360                         tcf_idr_cleanup(tn, index);
 361                         return ret;
 362                 }
 363
 364                 ret = ACT_P_CREATED;
 365         } else if (!(flags & TCA_ACT_FLAGS_REPLACE)) {
 366                 tcf_idr_release(*a, bind);
 367                 return -EEXIST;
 368         }
 369
 370         if (tb[TCA_GATE_PRIORITY])
 371                 prio = nla_get_s32(tb[TCA_GATE_PRIORITY]);
 372
 373         if (tb[TCA_GATE_BASE_TIME])
 374                 basetime = nla_get_u64(tb[TCA_GATE_BASE_TIME]);
 375
 376         if (tb[TCA_GATE_FLAGS])
 377                 gflags = nla_get_u32(tb[TCA_GATE_FLAGS]);
 378
 379         gact = to_gate(*a);
 380         if (ret == ACT_P_CREATED)
 381                 INIT_LIST_HEAD(&gact->param.entries);
 382
 383         err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack);
 384         if (err < 0)
 385                 goto release_idr;
 386
 387         spin_lock_bh(&gact->tcf_lock);
 388         p = &gact->param;
 389
 390         if (tb[TCA_GATE_CYCLE_TIME])
 391                 cycletime = nla_get_u64(tb[TCA_GATE_CYCLE_TIME]);
 392
 393         if (tb[TCA_GATE_ENTRY_LIST]) {
 394                 err = parse_gate_list(tb[TCA_GATE_ENTRY_LIST], p, extack);
 395                 if (err < 0)
 396                         goto chain_put;
 397         }
 398
 399         if (!cycletime) {
 400                 struct tcfg_gate_entry *entry;
 401                 ktime_t cycle = 0;
 402
 403                 list_for_each_entry(entry, &p->entries, list)
 404                         cycle = ktime_add_ns(cycle, entry->interval);
 405                 cycletime = cycle;
 406                 if (!cycletime) {
 407                         err = -EINVAL;
 408                         goto chain_put;
 409                 }
 410         }
 411         p->tcfg_cycletime = cycletime;
 412
 413         if (tb[TCA_GATE_CYCLE_TIME_EXT])
 414                 p->tcfg_cycletime_ext =
 415                         nla_get_u64(tb[TCA_GATE_CYCLE_TIME_EXT]);
 416
 417         gate_setup_timer(gact, basetime, tk_offset, clockid,
 418                          ret == ACT_P_CREATED);
 419         p->tcfg_priority = prio;
 420         p->tcfg_flags = gflags;
 421         gate_get_start_time(gact, &start);
 422
 423         gact->current_close_time = start;
 424         gact->current_gate_status = GATE_ACT_GATE_OPEN | GATE_ACT_PENDING;
 425
 426         gact->next_entry = list_first_entry(&p->entries,
 427                                             struct tcfg_gate_entry, list);
 428
 429         goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
 430
 431         gate_start_timer(gact, start);
 432
 433         spin_unlock_bh(&gact->tcf_lock);
 434
 435         if (goto_ch)
 436                 tcf_chain_put_by_act(goto_ch);
 437
 438         return ret;
 439
 440 chain_put:
 441         spin_unlock_bh(&gact->tcf_lock);
 442
 443         if (goto_ch)
 444                 tcf_chain_put_by_act(goto_ch);
 445 release_idr:
 446         /* action is not inserted in any list: it's safe to init hitimer
 447          * without taking tcf_lock.
 448          */
 449         if (ret == ACT_P_CREATED)
 450                 gate_setup_timer(gact, gact->param.tcfg_basetime,
 451                                  gact->tk_offset, gact->param.tcfg_clockid,
 452                                  true);
 453         tcf_idr_release(*a, bind);
 454         return err;
 455 }
 456
 457 static void tcf_gate_cleanup(struct tc_action *a)
 458 {
 459         struct tcf_gate *gact = to_gate(a);
 460         struct tcf_gate_params *p;
 461
 462         p = &gact->param;
 463         hrtimer_cancel(&gact->hitimer);
 464         release_entry_list(&p->entries);
 465 }
 466
 467 static int dumping_entry(struct sk_buff *skb,
 468                          struct tcfg_gate_entry *entry)
 469 {
 470         struct nlattr *item;
 471
 472         item = nla_nest_start_noflag(skb, TCA_GATE_ONE_ENTRY);
 473         if (!item)
 474                 return -ENOSPC;
 475
 476         if (nla_put_u32(skb, TCA_GATE_ENTRY_INDEX, entry->index))
 477                 goto nla_put_failure;
 478
 479         if (entry->gate_state && nla_put_flag(skb, TCA_GATE_ENTRY_GATE))
 480                 goto nla_put_failure;
 481
 482         if (nla_put_u32(skb, TCA_GATE_ENTRY_INTERVAL, entry->interval))
 483                 goto nla_put_failure;
 484
 485         if (nla_put_s32(skb, TCA_GATE_ENTRY_MAX_OCTETS, entry->maxoctets))
 486                 goto nla_put_failure;
 487
 488         if (nla_put_s32(skb, TCA_GATE_ENTRY_IPV, entry->ipv))
 489                 goto nla_put_failure;
 490
 491         return nla_nest_end(skb, item);
 492
 493 nla_put_failure:
 494         nla_nest_cancel(skb, item);
 495         return -1;
 496 }
 497
 498 static int tcf_gate_dump(struct sk_buff *skb, struct tc_action *a,
 499                          int bind, int ref)
 500 {
 501         unsigned char *b = skb_tail_pointer(skb);
 502         struct tcf_gate *gact = to_gate(a);
 503         struct tc_gate opt = {
 504                 .index    = gact->tcf_index,
 505                 .refcnt   = refcount_read(&gact->tcf_refcnt) - ref,
 506                 .bindcnt  = atomic_read(&gact->tcf_bindcnt) - bind,
 507         };
 508         struct tcfg_gate_entry *entry;
 509         struct tcf_gate_params *p;
 510         struct nlattr *entry_list;
 511         struct tcf_t t;
 512
 513         spin_lock_bh(&gact->tcf_lock);
 514         opt.action = gact->tcf_action;
 515
 516         p = &gact->param;
 517
 518         if (nla_put(skb, TCA_GATE_PARMS, sizeof(opt), &opt))
 519                 goto nla_put_failure;
 520
 521         if (nla_put_u64_64bit(skb, TCA_GATE_BASE_TIME,
 522                               p->tcfg_basetime, TCA_GATE_PAD))
 523                 goto nla_put_failure;
 524
 525         if (nla_put_u64_64bit(skb, TCA_GATE_CYCLE_TIME,
 526                               p->tcfg_cycletime, TCA_GATE_PAD))
 527                 goto nla_put_failure;
 528
 529         if (nla_put_u64_64bit(skb, TCA_GATE_CYCLE_TIME_EXT,
 530                               p->tcfg_cycletime_ext, TCA_GATE_PAD))
 531                 goto nla_put_failure;
 532
 533         if (nla_put_s32(skb, TCA_GATE_CLOCKID, p->tcfg_clockid))
 534                 goto nla_put_failure;
 535
 536         if (nla_put_u32(skb, TCA_GATE_FLAGS, p->tcfg_flags))
 537                 goto nla_put_failure;
 538
 539         if (nla_put_s32(skb, TCA_GATE_PRIORITY, p->tcfg_priority))
 540                 goto nla_put_failure;
 541
 542         entry_list = nla_nest_start_noflag(skb, TCA_GATE_ENTRY_LIST);
 543         if (!entry_list)
 544                 goto nla_put_failure;
 545
 546         list_for_each_entry(entry, &p->entries, list) {
 547                 if (dumping_entry(skb, entry) < 0)
 548                         goto nla_put_failure;
 549         }
 550
 551         nla_nest_end(skb, entry_list);
 552
 553         tcf_tm_dump(&t, &gact->tcf_tm);
 554         if (nla_put_64bit(skb, TCA_GATE_TM, sizeof(t), &t, TCA_GATE_PAD))
 555                 goto nla_put_failure;
 556         spin_unlock_bh(&gact->tcf_lock);
 557
 558         return skb->len;
 559
 560 nla_put_failure:
 561         spin_unlock_bh(&gact->tcf_lock);
 562         nlmsg_trim(skb, b);
 563         return -1;
 564 }
 565
 566 static void tcf_gate_stats_update(struct tc_action *a, u64 bytes, u64 packets,
 567                                   u64 drops, u64 lastuse, bool hw)
 568 {
 569         struct tcf_gate *gact = to_gate(a);
 570         struct tcf_t *tm = &gact->tcf_tm;
 571
 572         tcf_action_update_stats(a, bytes, packets, drops, hw);
 573         tm->lastuse = max_t(u64, tm->lastuse, lastuse);
 574 }
 575
 576 static size_t tcf_gate_get_fill_size(const struct tc_action *act)
 577 {
 578         return nla_total_size(sizeof(struct tc_gate));
 579 }
 580
 581 static void tcf_gate_entry_destructor(void *priv)
 582 {
 583         struct action_gate_entry *oe = priv;
 584
 585         kfree(oe);
 586 }
 587
 588 static int tcf_gate_get_entries(struct flow_action_entry *entry,
 589                                 const struct tc_action *act)
 590 {
 591         entry->gate.entries = tcf_gate_get_list(act);
 592
 593         if (!entry->gate.entries)
 594                 return -EINVAL;
 595
 596         entry->destructor = tcf_gate_entry_destructor;
 597         entry->destructor_priv = entry->gate.entries;
 598
 599         return 0;
 600 }
 601
 602 static int tcf_gate_offload_act_setup(struct tc_action *act, void *entry_data,
 603                                       u32 *index_inc, bool bind,
 604                                       struct netlink_ext_ack *extack)
 605 {
 606         int err;
 607
 608         if (bind) {
 609                 struct flow_action_entry *entry = entry_data;
 610
 611                 entry->id = FLOW_ACTION_GATE;
 612                 entry->gate.prio = tcf_gate_prio(act);
 613                 entry->gate.basetime = tcf_gate_basetime(act);
 614                 entry->gate.cycletime = tcf_gate_cycletime(act);
 615                 entry->gate.cycletimeext = tcf_gate_cycletimeext(act);
 616                 entry->gate.num_entries = tcf_gate_num_entries(act);
 617                 err = tcf_gate_get_entries(entry, act);
 618                 if (err)
 619                         return err;
 620                 *index_inc = 1;
 621         } else {
 622                 struct flow_offload_action *fl_action = entry_data;
 623
 624                 fl_action->id = FLOW_ACTION_GATE;
 625         }
 626
 627         return 0;
 628 }
 629
 630 static struct tc_action_ops act_gate_ops = {
 631         .kind           =       "gate",
 632         .id             =       TCA_ID_GATE,
 633         .owner          =       THIS_MODULE,
 634         .act            =       tcf_gate_act,
 635         .dump           =       tcf_gate_dump,
 636         .init           =       tcf_gate_init,
 637         .cleanup        =       tcf_gate_cleanup,
 638         .stats_update   =       tcf_gate_stats_update,
 639         .get_fill_size  =       tcf_gate_get_fill_size,
 640         .offload_act_setup =    tcf_gate_offload_act_setup,
 641         .size           =       sizeof(struct tcf_gate),
 642 };
 643 MODULE_ALIAS_NET_ACT("gate");
 644
 645 static __net_init int gate_init_net(struct net *net)
 646 {
 647         struct tc_action_net *tn = net_generic(net, act_gate_ops.net_id);
 648
 649         return tc_action_net_init(net, tn, &act_gate_ops);
 650 }
 651
 652 static void __net_exit gate_exit_net(struct list_head *net_list)
 653 {
 654         tc_action_net_exit(net_list, act_gate_ops.net_id);
 655 }
 656
 657 static struct pernet_operations gate_net_ops = {
 658         .init = gate_init_net,
 659         .exit_batch = gate_exit_net,
 660         .id   = &act_gate_ops.net_id,
 661         .size = sizeof(struct tc_action_net),
 662 };
 663
 664 static int __init gate_init_module(void)
 665 {
 666         return tcf_register_action(&act_gate_ops, &gate_net_ops);
 667 }
 668
 669 static void __exit gate_cleanup_module(void)
 670 {
 671         tcf_unregister_action(&act_gate_ops, &gate_net_ops);
 672 }
 673
 674 module_init(gate_init_module);
 675 module_exit(gate_cleanup_module);
 676 MODULE_DESCRIPTION("TC gate action");
 677 MODULE_LICENSE("GPL v2");