linux/net/sched/cls_flow.c
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   1/*
   2 * net/sched/cls_flow.c         Generic flow classifier
   3 *
   4 * Copyright (c) 2007, 2008 Patrick McHardy <kaber@trash.net>
   5 *
   6 * This program is free software; you can redistribute it and/or
   7 * modify it under the terms of the GNU General Public License
   8 * as published by the Free Software Foundation; either version 2
   9 * of the License, or (at your option) any later version.
  10 */
  11
  12#include <linux/kernel.h>
  13#include <linux/init.h>
  14#include <linux/list.h>
  15#include <linux/jhash.h>
  16#include <linux/random.h>
  17#include <linux/pkt_cls.h>
  18#include <linux/skbuff.h>
  19#include <linux/in.h>
  20#include <linux/ip.h>
  21#include <linux/ipv6.h>
  22#include <linux/if_vlan.h>
  23#include <linux/slab.h>
  24#include <linux/module.h>
  25
  26#include <net/pkt_cls.h>
  27#include <net/ip.h>
  28#include <net/route.h>
  29#include <net/flow_keys.h>
  30
  31#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
  32#include <net/netfilter/nf_conntrack.h>
  33#endif
  34
  35struct flow_head {
  36        struct list_head        filters;
  37};
  38
  39struct flow_filter {
  40        struct list_head        list;
  41        struct tcf_exts         exts;
  42        struct tcf_ematch_tree  ematches;
  43        struct timer_list       perturb_timer;
  44        u32                     perturb_period;
  45        u32                     handle;
  46
  47        u32                     nkeys;
  48        u32                     keymask;
  49        u32                     mode;
  50        u32                     mask;
  51        u32                     xor;
  52        u32                     rshift;
  53        u32                     addend;
  54        u32                     divisor;
  55        u32                     baseclass;
  56        u32                     hashrnd;
  57};
  58
  59static const struct tcf_ext_map flow_ext_map = {
  60        .action = TCA_FLOW_ACT,
  61        .police = TCA_FLOW_POLICE,
  62};
  63
  64static inline u32 addr_fold(void *addr)
  65{
  66        unsigned long a = (unsigned long)addr;
  67
  68        return (a & 0xFFFFFFFF) ^ (BITS_PER_LONG > 32 ? a >> 32 : 0);
  69}
  70
  71static u32 flow_get_src(const struct sk_buff *skb, const struct flow_keys *flow)
  72{
  73        if (flow->src)
  74                return ntohl(flow->src);
  75        return addr_fold(skb->sk);
  76}
  77
  78static u32 flow_get_dst(const struct sk_buff *skb, const struct flow_keys *flow)
  79{
  80        if (flow->dst)
  81                return ntohl(flow->dst);
  82        return addr_fold(skb_dst(skb)) ^ (__force u16)skb->protocol;
  83}
  84
  85static u32 flow_get_proto(const struct sk_buff *skb, const struct flow_keys *flow)
  86{
  87        return flow->ip_proto;
  88}
  89
  90static u32 flow_get_proto_src(const struct sk_buff *skb, const struct flow_keys *flow)
  91{
  92        if (flow->ports)
  93                return ntohs(flow->port16[0]);
  94
  95        return addr_fold(skb->sk);
  96}
  97
  98static u32 flow_get_proto_dst(const struct sk_buff *skb, const struct flow_keys *flow)
  99{
 100        if (flow->ports)
 101                return ntohs(flow->port16[1]);
 102
 103        return addr_fold(skb_dst(skb)) ^ (__force u16)skb->protocol;
 104}
 105
 106static u32 flow_get_iif(const struct sk_buff *skb)
 107{
 108        return skb->skb_iif;
 109}
 110
 111static u32 flow_get_priority(const struct sk_buff *skb)
 112{
 113        return skb->priority;
 114}
 115
 116static u32 flow_get_mark(const struct sk_buff *skb)
 117{
 118        return skb->mark;
 119}
 120
 121static u32 flow_get_nfct(const struct sk_buff *skb)
 122{
 123#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
 124        return addr_fold(skb->nfct);
 125#else
 126        return 0;
 127#endif
 128}
 129
 130#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
 131#define CTTUPLE(skb, member)                                            \
 132({                                                                      \
 133        enum ip_conntrack_info ctinfo;                                  \
 134        const struct nf_conn *ct = nf_ct_get(skb, &ctinfo);             \
 135        if (ct == NULL)                                                 \
 136                goto fallback;                                          \
 137        ct->tuplehash[CTINFO2DIR(ctinfo)].tuple.member;                 \
 138})
 139#else
 140#define CTTUPLE(skb, member)                                            \
 141({                                                                      \
 142        goto fallback;                                                  \
 143        0;                                                              \
 144})
 145#endif
 146
 147static u32 flow_get_nfct_src(const struct sk_buff *skb, const struct flow_keys *flow)
 148{
 149        switch (skb->protocol) {
 150        case htons(ETH_P_IP):
 151                return ntohl(CTTUPLE(skb, src.u3.ip));
 152        case htons(ETH_P_IPV6):
 153                return ntohl(CTTUPLE(skb, src.u3.ip6[3]));
 154        }
 155fallback:
 156        return flow_get_src(skb, flow);
 157}
 158
 159static u32 flow_get_nfct_dst(const struct sk_buff *skb, const struct flow_keys *flow)
 160{
 161        switch (skb->protocol) {
 162        case htons(ETH_P_IP):
 163                return ntohl(CTTUPLE(skb, dst.u3.ip));
 164        case htons(ETH_P_IPV6):
 165                return ntohl(CTTUPLE(skb, dst.u3.ip6[3]));
 166        }
 167fallback:
 168        return flow_get_dst(skb, flow);
 169}
 170
 171static u32 flow_get_nfct_proto_src(const struct sk_buff *skb, const struct flow_keys *flow)
 172{
 173        return ntohs(CTTUPLE(skb, src.u.all));
 174fallback:
 175        return flow_get_proto_src(skb, flow);
 176}
 177
 178static u32 flow_get_nfct_proto_dst(const struct sk_buff *skb, const struct flow_keys *flow)
 179{
 180        return ntohs(CTTUPLE(skb, dst.u.all));
 181fallback:
 182        return flow_get_proto_dst(skb, flow);
 183}
 184
 185static u32 flow_get_rtclassid(const struct sk_buff *skb)
 186{
 187#ifdef CONFIG_IP_ROUTE_CLASSID
 188        if (skb_dst(skb))
 189                return skb_dst(skb)->tclassid;
 190#endif
 191        return 0;
 192}
 193
 194static u32 flow_get_skuid(const struct sk_buff *skb)
 195{
 196        if (skb->sk && skb->sk->sk_socket && skb->sk->sk_socket->file)
 197                return skb->sk->sk_socket->file->f_cred->fsuid;
 198        return 0;
 199}
 200
 201static u32 flow_get_skgid(const struct sk_buff *skb)
 202{
 203        if (skb->sk && skb->sk->sk_socket && skb->sk->sk_socket->file)
 204                return skb->sk->sk_socket->file->f_cred->fsgid;
 205        return 0;
 206}
 207
 208static u32 flow_get_vlan_tag(const struct sk_buff *skb)
 209{
 210        u16 uninitialized_var(tag);
 211
 212        if (vlan_get_tag(skb, &tag) < 0)
 213                return 0;
 214        return tag & VLAN_VID_MASK;
 215}
 216
 217static u32 flow_get_rxhash(struct sk_buff *skb)
 218{
 219        return skb_get_rxhash(skb);
 220}
 221
 222static u32 flow_key_get(struct sk_buff *skb, int key, struct flow_keys *flow)
 223{
 224        switch (key) {
 225        case FLOW_KEY_SRC:
 226                return flow_get_src(skb, flow);
 227        case FLOW_KEY_DST:
 228                return flow_get_dst(skb, flow);
 229        case FLOW_KEY_PROTO:
 230                return flow_get_proto(skb, flow);
 231        case FLOW_KEY_PROTO_SRC:
 232                return flow_get_proto_src(skb, flow);
 233        case FLOW_KEY_PROTO_DST:
 234                return flow_get_proto_dst(skb, flow);
 235        case FLOW_KEY_IIF:
 236                return flow_get_iif(skb);
 237        case FLOW_KEY_PRIORITY:
 238                return flow_get_priority(skb);
 239        case FLOW_KEY_MARK:
 240                return flow_get_mark(skb);
 241        case FLOW_KEY_NFCT:
 242                return flow_get_nfct(skb);
 243        case FLOW_KEY_NFCT_SRC:
 244                return flow_get_nfct_src(skb, flow);
 245        case FLOW_KEY_NFCT_DST:
 246                return flow_get_nfct_dst(skb, flow);
 247        case FLOW_KEY_NFCT_PROTO_SRC:
 248                return flow_get_nfct_proto_src(skb, flow);
 249        case FLOW_KEY_NFCT_PROTO_DST:
 250                return flow_get_nfct_proto_dst(skb, flow);
 251        case FLOW_KEY_RTCLASSID:
 252                return flow_get_rtclassid(skb);
 253        case FLOW_KEY_SKUID:
 254                return flow_get_skuid(skb);
 255        case FLOW_KEY_SKGID:
 256                return flow_get_skgid(skb);
 257        case FLOW_KEY_VLAN_TAG:
 258                return flow_get_vlan_tag(skb);
 259        case FLOW_KEY_RXHASH:
 260                return flow_get_rxhash(skb);
 261        default:
 262                WARN_ON(1);
 263                return 0;
 264        }
 265}
 266
 267#define FLOW_KEYS_NEEDED ((1 << FLOW_KEY_SRC) |                 \
 268                          (1 << FLOW_KEY_DST) |                 \
 269                          (1 << FLOW_KEY_PROTO) |               \
 270                          (1 << FLOW_KEY_PROTO_SRC) |           \
 271                          (1 << FLOW_KEY_PROTO_DST) |           \
 272                          (1 << FLOW_KEY_NFCT_SRC) |            \
 273                          (1 << FLOW_KEY_NFCT_DST) |            \
 274                          (1 << FLOW_KEY_NFCT_PROTO_SRC) |      \
 275                          (1 << FLOW_KEY_NFCT_PROTO_DST))
 276
 277static int flow_classify(struct sk_buff *skb, const struct tcf_proto *tp,
 278                         struct tcf_result *res)
 279{
 280        struct flow_head *head = tp->root;
 281        struct flow_filter *f;
 282        u32 keymask;
 283        u32 classid;
 284        unsigned int n, key;
 285        int r;
 286
 287        list_for_each_entry(f, &head->filters, list) {
 288                u32 keys[FLOW_KEY_MAX + 1];
 289                struct flow_keys flow_keys;
 290
 291                if (!tcf_em_tree_match(skb, &f->ematches, NULL))
 292                        continue;
 293
 294                keymask = f->keymask;
 295                if (keymask & FLOW_KEYS_NEEDED)
 296                        skb_flow_dissect(skb, &flow_keys);
 297
 298                for (n = 0; n < f->nkeys; n++) {
 299                        key = ffs(keymask) - 1;
 300                        keymask &= ~(1 << key);
 301                        keys[n] = flow_key_get(skb, key, &flow_keys);
 302                }
 303
 304                if (f->mode == FLOW_MODE_HASH)
 305                        classid = jhash2(keys, f->nkeys, f->hashrnd);
 306                else {
 307                        classid = keys[0];
 308                        classid = (classid & f->mask) ^ f->xor;
 309                        classid = (classid >> f->rshift) + f->addend;
 310                }
 311
 312                if (f->divisor)
 313                        classid %= f->divisor;
 314
 315                res->class   = 0;
 316                res->classid = TC_H_MAKE(f->baseclass, f->baseclass + classid);
 317
 318                r = tcf_exts_exec(skb, &f->exts, res);
 319                if (r < 0)
 320                        continue;
 321                return r;
 322        }
 323        return -1;
 324}
 325
 326static void flow_perturbation(unsigned long arg)
 327{
 328        struct flow_filter *f = (struct flow_filter *)arg;
 329
 330        get_random_bytes(&f->hashrnd, 4);
 331        if (f->perturb_period)
 332                mod_timer(&f->perturb_timer, jiffies + f->perturb_period);
 333}
 334
 335static const struct nla_policy flow_policy[TCA_FLOW_MAX + 1] = {
 336        [TCA_FLOW_KEYS]         = { .type = NLA_U32 },
 337        [TCA_FLOW_MODE]         = { .type = NLA_U32 },
 338        [TCA_FLOW_BASECLASS]    = { .type = NLA_U32 },
 339        [TCA_FLOW_RSHIFT]       = { .type = NLA_U32 },
 340        [TCA_FLOW_ADDEND]       = { .type = NLA_U32 },
 341        [TCA_FLOW_MASK]         = { .type = NLA_U32 },
 342        [TCA_FLOW_XOR]          = { .type = NLA_U32 },
 343        [TCA_FLOW_DIVISOR]      = { .type = NLA_U32 },
 344        [TCA_FLOW_ACT]          = { .type = NLA_NESTED },
 345        [TCA_FLOW_POLICE]       = { .type = NLA_NESTED },
 346        [TCA_FLOW_EMATCHES]     = { .type = NLA_NESTED },
 347        [TCA_FLOW_PERTURB]      = { .type = NLA_U32 },
 348};
 349
 350static int flow_change(struct tcf_proto *tp, unsigned long base,
 351                       u32 handle, struct nlattr **tca,
 352                       unsigned long *arg)
 353{
 354        struct flow_head *head = tp->root;
 355        struct flow_filter *f;
 356        struct nlattr *opt = tca[TCA_OPTIONS];
 357        struct nlattr *tb[TCA_FLOW_MAX + 1];
 358        struct tcf_exts e;
 359        struct tcf_ematch_tree t;
 360        unsigned int nkeys = 0;
 361        unsigned int perturb_period = 0;
 362        u32 baseclass = 0;
 363        u32 keymask = 0;
 364        u32 mode;
 365        int err;
 366
 367        if (opt == NULL)
 368                return -EINVAL;
 369
 370        err = nla_parse_nested(tb, TCA_FLOW_MAX, opt, flow_policy);
 371        if (err < 0)
 372                return err;
 373
 374        if (tb[TCA_FLOW_BASECLASS]) {
 375                baseclass = nla_get_u32(tb[TCA_FLOW_BASECLASS]);
 376                if (TC_H_MIN(baseclass) == 0)
 377                        return -EINVAL;
 378        }
 379
 380        if (tb[TCA_FLOW_KEYS]) {
 381                keymask = nla_get_u32(tb[TCA_FLOW_KEYS]);
 382
 383                nkeys = hweight32(keymask);
 384                if (nkeys == 0)
 385                        return -EINVAL;
 386
 387                if (fls(keymask) - 1 > FLOW_KEY_MAX)
 388                        return -EOPNOTSUPP;
 389        }
 390
 391        err = tcf_exts_validate(tp, tb, tca[TCA_RATE], &e, &flow_ext_map);
 392        if (err < 0)
 393                return err;
 394
 395        err = tcf_em_tree_validate(tp, tb[TCA_FLOW_EMATCHES], &t);
 396        if (err < 0)
 397                goto err1;
 398
 399        f = (struct flow_filter *)*arg;
 400        if (f != NULL) {
 401                err = -EINVAL;
 402                if (f->handle != handle && handle)
 403                        goto err2;
 404
 405                mode = f->mode;
 406                if (tb[TCA_FLOW_MODE])
 407                        mode = nla_get_u32(tb[TCA_FLOW_MODE]);
 408                if (mode != FLOW_MODE_HASH && nkeys > 1)
 409                        goto err2;
 410
 411                if (mode == FLOW_MODE_HASH)
 412                        perturb_period = f->perturb_period;
 413                if (tb[TCA_FLOW_PERTURB]) {
 414                        if (mode != FLOW_MODE_HASH)
 415                                goto err2;
 416                        perturb_period = nla_get_u32(tb[TCA_FLOW_PERTURB]) * HZ;
 417                }
 418        } else {
 419                err = -EINVAL;
 420                if (!handle)
 421                        goto err2;
 422                if (!tb[TCA_FLOW_KEYS])
 423                        goto err2;
 424
 425                mode = FLOW_MODE_MAP;
 426                if (tb[TCA_FLOW_MODE])
 427                        mode = nla_get_u32(tb[TCA_FLOW_MODE]);
 428                if (mode != FLOW_MODE_HASH && nkeys > 1)
 429                        goto err2;
 430
 431                if (tb[TCA_FLOW_PERTURB]) {
 432                        if (mode != FLOW_MODE_HASH)
 433                                goto err2;
 434                        perturb_period = nla_get_u32(tb[TCA_FLOW_PERTURB]) * HZ;
 435                }
 436
 437                if (TC_H_MAJ(baseclass) == 0)
 438                        baseclass = TC_H_MAKE(tp->q->handle, baseclass);
 439                if (TC_H_MIN(baseclass) == 0)
 440                        baseclass = TC_H_MAKE(baseclass, 1);
 441
 442                err = -ENOBUFS;
 443                f = kzalloc(sizeof(*f), GFP_KERNEL);
 444                if (f == NULL)
 445                        goto err2;
 446
 447                f->handle = handle;
 448                f->mask   = ~0U;
 449
 450                get_random_bytes(&f->hashrnd, 4);
 451                f->perturb_timer.function = flow_perturbation;
 452                f->perturb_timer.data = (unsigned long)f;
 453                init_timer_deferrable(&f->perturb_timer);
 454        }
 455
 456        tcf_exts_change(tp, &f->exts, &e);
 457        tcf_em_tree_change(tp, &f->ematches, &t);
 458
 459        tcf_tree_lock(tp);
 460
 461        if (tb[TCA_FLOW_KEYS]) {
 462                f->keymask = keymask;
 463                f->nkeys   = nkeys;
 464        }
 465
 466        f->mode = mode;
 467
 468        if (tb[TCA_FLOW_MASK])
 469                f->mask = nla_get_u32(tb[TCA_FLOW_MASK]);
 470        if (tb[TCA_FLOW_XOR])
 471                f->xor = nla_get_u32(tb[TCA_FLOW_XOR]);
 472        if (tb[TCA_FLOW_RSHIFT])
 473                f->rshift = nla_get_u32(tb[TCA_FLOW_RSHIFT]);
 474        if (tb[TCA_FLOW_ADDEND])
 475                f->addend = nla_get_u32(tb[TCA_FLOW_ADDEND]);
 476
 477        if (tb[TCA_FLOW_DIVISOR])
 478                f->divisor = nla_get_u32(tb[TCA_FLOW_DIVISOR]);
 479        if (baseclass)
 480                f->baseclass = baseclass;
 481
 482        f->perturb_period = perturb_period;
 483        del_timer(&f->perturb_timer);
 484        if (perturb_period)
 485                mod_timer(&f->perturb_timer, jiffies + perturb_period);
 486
 487        if (*arg == 0)
 488                list_add_tail(&f->list, &head->filters);
 489
 490        tcf_tree_unlock(tp);
 491
 492        *arg = (unsigned long)f;
 493        return 0;
 494
 495err2:
 496        tcf_em_tree_destroy(tp, &t);
 497err1:
 498        tcf_exts_destroy(tp, &e);
 499        return err;
 500}
 501
 502static void flow_destroy_filter(struct tcf_proto *tp, struct flow_filter *f)
 503{
 504        del_timer_sync(&f->perturb_timer);
 505        tcf_exts_destroy(tp, &f->exts);
 506        tcf_em_tree_destroy(tp, &f->ematches);
 507        kfree(f);
 508}
 509
 510static int flow_delete(struct tcf_proto *tp, unsigned long arg)
 511{
 512        struct flow_filter *f = (struct flow_filter *)arg;
 513
 514        tcf_tree_lock(tp);
 515        list_del(&f->list);
 516        tcf_tree_unlock(tp);
 517        flow_destroy_filter(tp, f);
 518        return 0;
 519}
 520
 521static int flow_init(struct tcf_proto *tp)
 522{
 523        struct flow_head *head;
 524
 525        head = kzalloc(sizeof(*head), GFP_KERNEL);
 526        if (head == NULL)
 527                return -ENOBUFS;
 528        INIT_LIST_HEAD(&head->filters);
 529        tp->root = head;
 530        return 0;
 531}
 532
 533static void flow_destroy(struct tcf_proto *tp)
 534{
 535        struct flow_head *head = tp->root;
 536        struct flow_filter *f, *next;
 537
 538        list_for_each_entry_safe(f, next, &head->filters, list) {
 539                list_del(&f->list);
 540                flow_destroy_filter(tp, f);
 541        }
 542        kfree(head);
 543}
 544
 545static unsigned long flow_get(struct tcf_proto *tp, u32 handle)
 546{
 547        struct flow_head *head = tp->root;
 548        struct flow_filter *f;
 549
 550        list_for_each_entry(f, &head->filters, list)
 551                if (f->handle == handle)
 552                        return (unsigned long)f;
 553        return 0;
 554}
 555
 556static void flow_put(struct tcf_proto *tp, unsigned long f)
 557{
 558}
 559
 560static int flow_dump(struct tcf_proto *tp, unsigned long fh,
 561                     struct sk_buff *skb, struct tcmsg *t)
 562{
 563        struct flow_filter *f = (struct flow_filter *)fh;
 564        struct nlattr *nest;
 565
 566        if (f == NULL)
 567                return skb->len;
 568
 569        t->tcm_handle = f->handle;
 570
 571        nest = nla_nest_start(skb, TCA_OPTIONS);
 572        if (nest == NULL)
 573                goto nla_put_failure;
 574
 575        if (nla_put_u32(skb, TCA_FLOW_KEYS, f->keymask) ||
 576            nla_put_u32(skb, TCA_FLOW_MODE, f->mode))
 577                goto nla_put_failure;
 578
 579        if (f->mask != ~0 || f->xor != 0) {
 580                if (nla_put_u32(skb, TCA_FLOW_MASK, f->mask) ||
 581                    nla_put_u32(skb, TCA_FLOW_XOR, f->xor))
 582                        goto nla_put_failure;
 583        }
 584        if (f->rshift &&
 585            nla_put_u32(skb, TCA_FLOW_RSHIFT, f->rshift))
 586                goto nla_put_failure;
 587        if (f->addend &&
 588            nla_put_u32(skb, TCA_FLOW_ADDEND, f->addend))
 589                goto nla_put_failure;
 590
 591        if (f->divisor &&
 592            nla_put_u32(skb, TCA_FLOW_DIVISOR, f->divisor))
 593                goto nla_put_failure;
 594        if (f->baseclass &&
 595            nla_put_u32(skb, TCA_FLOW_BASECLASS, f->baseclass))
 596                goto nla_put_failure;
 597
 598        if (f->perturb_period &&
 599            nla_put_u32(skb, TCA_FLOW_PERTURB, f->perturb_period / HZ))
 600                goto nla_put_failure;
 601
 602        if (tcf_exts_dump(skb, &f->exts, &flow_ext_map) < 0)
 603                goto nla_put_failure;
 604#ifdef CONFIG_NET_EMATCH
 605        if (f->ematches.hdr.nmatches &&
 606            tcf_em_tree_dump(skb, &f->ematches, TCA_FLOW_EMATCHES) < 0)
 607                goto nla_put_failure;
 608#endif
 609        nla_nest_end(skb, nest);
 610
 611        if (tcf_exts_dump_stats(skb, &f->exts, &flow_ext_map) < 0)
 612                goto nla_put_failure;
 613
 614        return skb->len;
 615
 616nla_put_failure:
 617        nlmsg_trim(skb, nest);
 618        return -1;
 619}
 620
 621static void flow_walk(struct tcf_proto *tp, struct tcf_walker *arg)
 622{
 623        struct flow_head *head = tp->root;
 624        struct flow_filter *f;
 625
 626        list_for_each_entry(f, &head->filters, list) {
 627                if (arg->count < arg->skip)
 628                        goto skip;
 629                if (arg->fn(tp, (unsigned long)f, arg) < 0) {
 630                        arg->stop = 1;
 631                        break;
 632                }
 633skip:
 634                arg->count++;
 635        }
 636}
 637
 638static struct tcf_proto_ops cls_flow_ops __read_mostly = {
 639        .kind           = "flow",
 640        .classify       = flow_classify,
 641        .init           = flow_init,
 642        .destroy        = flow_destroy,
 643        .change         = flow_change,
 644        .delete         = flow_delete,
 645        .get            = flow_get,
 646        .put            = flow_put,
 647        .dump           = flow_dump,
 648        .walk           = flow_walk,
 649        .owner          = THIS_MODULE,
 650};
 651
 652static int __init cls_flow_init(void)
 653{
 654        return register_tcf_proto_ops(&cls_flow_ops);
 655}
 656
 657static void __exit cls_flow_exit(void)
 658{
 659        unregister_tcf_proto_ops(&cls_flow_ops);
 660}
 661
 662module_init(cls_flow_init);
 663module_exit(cls_flow_exit);
 664
 665MODULE_LICENSE("GPL");
 666MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
 667MODULE_DESCRIPTION("TC flow classifier");
 668
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