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