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                kuid_t skuid = skb->sk->sk_socket->file->f_cred->fsuid;
 198                return from_kuid(&init_user_ns, skuid);
 199        }
 200        return 0;
 201}
 202
 203static u32 flow_get_skgid(const struct sk_buff *skb)
 204{
 205        if (skb->sk && skb->sk->sk_socket && skb->sk->sk_socket->file) {
 206                kgid_t skgid = skb->sk->sk_socket->file->f_cred->fsgid;
 207                return from_kgid(&init_user_ns, skgid);
 208        }
 209        return 0;
 210}
 211
 212static u32 flow_get_vlan_tag(const struct sk_buff *skb)
 213{
 214        u16 uninitialized_var(tag);
 215
 216        if (vlan_get_tag(skb, &tag) < 0)
 217                return 0;
 218        return tag & VLAN_VID_MASK;
 219}
 220
 221static u32 flow_get_rxhash(struct sk_buff *skb)
 222{
 223        return skb_get_rxhash(skb);
 224}
 225
 226static u32 flow_key_get(struct sk_buff *skb, int key, struct flow_keys *flow)
 227{
 228        switch (key) {
 229        case FLOW_KEY_SRC:
 230                return flow_get_src(skb, flow);
 231        case FLOW_KEY_DST:
 232                return flow_get_dst(skb, flow);
 233        case FLOW_KEY_PROTO:
 234                return flow_get_proto(skb, flow);
 235        case FLOW_KEY_PROTO_SRC:
 236                return flow_get_proto_src(skb, flow);
 237        case FLOW_KEY_PROTO_DST:
 238                return flow_get_proto_dst(skb, flow);
 239        case FLOW_KEY_IIF:
 240                return flow_get_iif(skb);
 241        case FLOW_KEY_PRIORITY:
 242                return flow_get_priority(skb);
 243        case FLOW_KEY_MARK:
 244                return flow_get_mark(skb);
 245        case FLOW_KEY_NFCT:
 246                return flow_get_nfct(skb);
 247        case FLOW_KEY_NFCT_SRC:
 248                return flow_get_nfct_src(skb, flow);
 249        case FLOW_KEY_NFCT_DST:
 250                return flow_get_nfct_dst(skb, flow);
 251        case FLOW_KEY_NFCT_PROTO_SRC:
 252                return flow_get_nfct_proto_src(skb, flow);
 253        case FLOW_KEY_NFCT_PROTO_DST:
 254                return flow_get_nfct_proto_dst(skb, flow);
 255        case FLOW_KEY_RTCLASSID:
 256                return flow_get_rtclassid(skb);
 257        case FLOW_KEY_SKUID:
 258                return flow_get_skuid(skb);
 259        case FLOW_KEY_SKGID:
 260                return flow_get_skgid(skb);
 261        case FLOW_KEY_VLAN_TAG:
 262                return flow_get_vlan_tag(skb);
 263        case FLOW_KEY_RXHASH:
 264                return flow_get_rxhash(skb);
 265        default:
 266                WARN_ON(1);
 267                return 0;
 268        }
 269}
 270
 271#define FLOW_KEYS_NEEDED ((1 << FLOW_KEY_SRC) |                 \
 272                          (1 << FLOW_KEY_DST) |                 \
 273                          (1 << FLOW_KEY_PROTO) |               \
 274                          (1 << FLOW_KEY_PROTO_SRC) |           \
 275                          (1 << FLOW_KEY_PROTO_DST) |           \
 276                          (1 << FLOW_KEY_NFCT_SRC) |            \
 277                          (1 << FLOW_KEY_NFCT_DST) |            \
 278                          (1 << FLOW_KEY_NFCT_PROTO_SRC) |      \
 279                          (1 << FLOW_KEY_NFCT_PROTO_DST))
 280
 281static int flow_classify(struct sk_buff *skb, const struct tcf_proto *tp,
 282                         struct tcf_result *res)
 283{
 284        struct flow_head *head = tp->root;
 285        struct flow_filter *f;
 286        u32 keymask;
 287        u32 classid;
 288        unsigned int n, key;
 289        int r;
 290
 291        list_for_each_entry(f, &head->filters, list) {
 292                u32 keys[FLOW_KEY_MAX + 1];
 293                struct flow_keys flow_keys;
 294
 295                if (!tcf_em_tree_match(skb, &f->ematches, NULL))
 296                        continue;
 297
 298                keymask = f->keymask;
 299                if (keymask & FLOW_KEYS_NEEDED)
 300                        skb_flow_dissect(skb, &flow_keys);
 301
 302                for (n = 0; n < f->nkeys; n++) {
 303                        key = ffs(keymask) - 1;
 304                        keymask &= ~(1 << key);
 305                        keys[n] = flow_key_get(skb, key, &flow_keys);
 306                }
 307
 308                if (f->mode == FLOW_MODE_HASH)
 309                        classid = jhash2(keys, f->nkeys, f->hashrnd);
 310                else {
 311                        classid = keys[0];
 312                        classid = (classid & f->mask) ^ f->xor;
 313                        classid = (classid >> f->rshift) + f->addend;
 314                }
 315
 316                if (f->divisor)
 317                        classid %= f->divisor;
 318
 319                res->class   = 0;
 320                res->classid = TC_H_MAKE(f->baseclass, f->baseclass + classid);
 321
 322                r = tcf_exts_exec(skb, &f->exts, res);
 323                if (r < 0)
 324                        continue;
 325                return r;
 326        }
 327        return -1;
 328}
 329
 330static void flow_perturbation(unsigned long arg)
 331{
 332        struct flow_filter *f = (struct flow_filter *)arg;
 333
 334        get_random_bytes(&f->hashrnd, 4);
 335        if (f->perturb_period)
 336                mod_timer(&f->perturb_timer, jiffies + f->perturb_period);
 337}
 338
 339static const struct nla_policy flow_policy[TCA_FLOW_MAX + 1] = {
 340        [TCA_FLOW_KEYS]         = { .type = NLA_U32 },
 341        [TCA_FLOW_MODE]         = { .type = NLA_U32 },
 342        [TCA_FLOW_BASECLASS]    = { .type = NLA_U32 },
 343        [TCA_FLOW_RSHIFT]       = { .type = NLA_U32 },
 344        [TCA_FLOW_ADDEND]       = { .type = NLA_U32 },
 345        [TCA_FLOW_MASK]         = { .type = NLA_U32 },
 346        [TCA_FLOW_XOR]          = { .type = NLA_U32 },
 347        [TCA_FLOW_DIVISOR]      = { .type = NLA_U32 },
 348        [TCA_FLOW_ACT]          = { .type = NLA_NESTED },
 349        [TCA_FLOW_POLICE]       = { .type = NLA_NESTED },
 350        [TCA_FLOW_EMATCHES]     = { .type = NLA_NESTED },
 351        [TCA_FLOW_PERTURB]      = { .type = NLA_U32 },
 352};
 353
 354static int flow_change(struct sk_buff *in_skb, 
 355                       struct tcf_proto *tp, unsigned long base,
 356                       u32 handle, struct nlattr **tca,
 357                       unsigned long *arg)
 358{
 359        struct flow_head *head = tp->root;
 360        struct flow_filter *f;
 361        struct nlattr *opt = tca[TCA_OPTIONS];
 362        struct nlattr *tb[TCA_FLOW_MAX + 1];
 363        struct tcf_exts e;
 364        struct tcf_ematch_tree t;
 365        unsigned int nkeys = 0;
 366        unsigned int perturb_period = 0;
 367        u32 baseclass = 0;
 368        u32 keymask = 0;
 369        u32 mode;
 370        int err;
 371
 372        if (opt == NULL)
 373                return -EINVAL;
 374
 375        err = nla_parse_nested(tb, TCA_FLOW_MAX, opt, flow_policy);
 376        if (err < 0)
 377                return err;
 378
 379        if (tb[TCA_FLOW_BASECLASS]) {
 380                baseclass = nla_get_u32(tb[TCA_FLOW_BASECLASS]);
 381                if (TC_H_MIN(baseclass) == 0)
 382                        return -EINVAL;
 383        }
 384
 385        if (tb[TCA_FLOW_KEYS]) {
 386                keymask = nla_get_u32(tb[TCA_FLOW_KEYS]);
 387
 388                nkeys = hweight32(keymask);
 389                if (nkeys == 0)
 390                        return -EINVAL;
 391
 392                if (fls(keymask) - 1 > FLOW_KEY_MAX)
 393                        return -EOPNOTSUPP;
 394
 395                if ((keymask & (FLOW_KEY_SKUID|FLOW_KEY_SKGID)) &&
 396                    sk_user_ns(NETLINK_CB(in_skb).ssk) != &init_user_ns)
 397                        return -EOPNOTSUPP;
 398        }
 399
 400        err = tcf_exts_validate(tp, tb, tca[TCA_RATE], &e, &flow_ext_map);
 401        if (err < 0)
 402                return err;
 403
 404        err = tcf_em_tree_validate(tp, tb[TCA_FLOW_EMATCHES], &t);
 405        if (err < 0)
 406                goto err1;
 407
 408        f = (struct flow_filter *)*arg;
 409        if (f != NULL) {
 410                err = -EINVAL;
 411                if (f->handle != handle && handle)
 412                        goto err2;
 413
 414                mode = f->mode;
 415                if (tb[TCA_FLOW_MODE])
 416                        mode = nla_get_u32(tb[TCA_FLOW_MODE]);
 417                if (mode != FLOW_MODE_HASH && nkeys > 1)
 418                        goto err2;
 419
 420                if (mode == FLOW_MODE_HASH)
 421                        perturb_period = f->perturb_period;
 422                if (tb[TCA_FLOW_PERTURB]) {
 423                        if (mode != FLOW_MODE_HASH)
 424                                goto err2;
 425                        perturb_period = nla_get_u32(tb[TCA_FLOW_PERTURB]) * HZ;
 426                }
 427        } else {
 428                err = -EINVAL;
 429                if (!handle)
 430                        goto err2;
 431                if (!tb[TCA_FLOW_KEYS])
 432                        goto err2;
 433
 434                mode = FLOW_MODE_MAP;
 435                if (tb[TCA_FLOW_MODE])
 436                        mode = nla_get_u32(tb[TCA_FLOW_MODE]);
 437                if (mode != FLOW_MODE_HASH && nkeys > 1)
 438                        goto err2;
 439
 440                if (tb[TCA_FLOW_PERTURB]) {
 441                        if (mode != FLOW_MODE_HASH)
 442                                goto err2;
 443                        perturb_period = nla_get_u32(tb[TCA_FLOW_PERTURB]) * HZ;
 444                }
 445
 446                if (TC_H_MAJ(baseclass) == 0)
 447                        baseclass = TC_H_MAKE(tp->q->handle, baseclass);
 448                if (TC_H_MIN(baseclass) == 0)
 449                        baseclass = TC_H_MAKE(baseclass, 1);
 450
 451                err = -ENOBUFS;
 452                f = kzalloc(sizeof(*f), GFP_KERNEL);
 453                if (f == NULL)
 454                        goto err2;
 455
 456                f->handle = handle;
 457                f->mask   = ~0U;
 458
 459                get_random_bytes(&f->hashrnd, 4);
 460                f->perturb_timer.function = flow_perturbation;
 461                f->perturb_timer.data = (unsigned long)f;
 462                init_timer_deferrable(&f->perturb_timer);
 463        }
 464
 465        tcf_exts_change(tp, &f->exts, &e);
 466        tcf_em_tree_change(tp, &f->ematches, &t);
 467
 468        tcf_tree_lock(tp);
 469
 470        if (tb[TCA_FLOW_KEYS]) {
 471                f->keymask = keymask;
 472                f->nkeys   = nkeys;
 473        }
 474
 475        f->mode = mode;
 476
 477        if (tb[TCA_FLOW_MASK])
 478                f->mask = nla_get_u32(tb[TCA_FLOW_MASK]);
 479        if (tb[TCA_FLOW_XOR])
 480                f->xor = nla_get_u32(tb[TCA_FLOW_XOR]);
 481        if (tb[TCA_FLOW_RSHIFT])
 482                f->rshift = nla_get_u32(tb[TCA_FLOW_RSHIFT]);
 483        if (tb[TCA_FLOW_ADDEND])
 484                f->addend = nla_get_u32(tb[TCA_FLOW_ADDEND]);
 485
 486        if (tb[TCA_FLOW_DIVISOR])
 487                f->divisor = nla_get_u32(tb[TCA_FLOW_DIVISOR]);
 488        if (baseclass)
 489                f->baseclass = baseclass;
 490
 491        f->perturb_period = perturb_period;
 492        del_timer(&f->perturb_timer);
 493        if (perturb_period)
 494                mod_timer(&f->perturb_timer, jiffies + perturb_period);
 495
 496        if (*arg == 0)
 497                list_add_tail(&f->list, &head->filters);
 498
 499        tcf_tree_unlock(tp);
 500
 501        *arg = (unsigned long)f;
 502        return 0;
 503
 504err2:
 505        tcf_em_tree_destroy(tp, &t);
 506err1:
 507        tcf_exts_destroy(tp, &e);
 508        return err;
 509}
 510
 511static void flow_destroy_filter(struct tcf_proto *tp, struct flow_filter *f)
 512{
 513        del_timer_sync(&f->perturb_timer);
 514        tcf_exts_destroy(tp, &f->exts);
 515        tcf_em_tree_destroy(tp, &f->ematches);
 516        kfree(f);
 517}
 518
 519static int flow_delete(struct tcf_proto *tp, unsigned long arg)
 520{
 521        struct flow_filter *f = (struct flow_filter *)arg;
 522
 523        tcf_tree_lock(tp);
 524        list_del(&f->list);
 525        tcf_tree_unlock(tp);
 526        flow_destroy_filter(tp, f);
 527        return 0;
 528}
 529
 530static int flow_init(struct tcf_proto *tp)
 531{
 532        struct flow_head *head;
 533
 534        head = kzalloc(sizeof(*head), GFP_KERNEL);
 535        if (head == NULL)
 536                return -ENOBUFS;
 537        INIT_LIST_HEAD(&head->filters);
 538        tp->root = head;
 539        return 0;
 540}
 541
 542static void flow_destroy(struct tcf_proto *tp)
 543{
 544        struct flow_head *head = tp->root;
 545        struct flow_filter *f, *next;
 546
 547        list_for_each_entry_safe(f, next, &head->filters, list) {
 548                list_del(&f->list);
 549                flow_destroy_filter(tp, f);
 550        }
 551        kfree(head);
 552}
 553
 554static unsigned long flow_get(struct tcf_proto *tp, u32 handle)
 555{
 556        struct flow_head *head = tp->root;
 557        struct flow_filter *f;
 558
 559        list_for_each_entry(f, &head->filters, list)
 560                if (f->handle == handle)
 561                        return (unsigned long)f;
 562        return 0;
 563}
 564
 565static void flow_put(struct tcf_proto *tp, unsigned long f)
 566{
 567}
 568
 569static int flow_dump(struct tcf_proto *tp, unsigned long fh,
 570                     struct sk_buff *skb, struct tcmsg *t)
 571{
 572        struct flow_filter *f = (struct flow_filter *)fh;
 573        struct nlattr *nest;
 574
 575        if (f == NULL)
 576                return skb->len;
 577
 578        t->tcm_handle = f->handle;
 579
 580        nest = nla_nest_start(skb, TCA_OPTIONS);
 581        if (nest == NULL)
 582                goto nla_put_failure;
 583
 584        if (nla_put_u32(skb, TCA_FLOW_KEYS, f->keymask) ||
 585            nla_put_u32(skb, TCA_FLOW_MODE, f->mode))
 586                goto nla_put_failure;
 587
 588        if (f->mask != ~0 || f->xor != 0) {
 589                if (nla_put_u32(skb, TCA_FLOW_MASK, f->mask) ||
 590                    nla_put_u32(skb, TCA_FLOW_XOR, f->xor))
 591                        goto nla_put_failure;
 592        }
 593        if (f->rshift &&
 594            nla_put_u32(skb, TCA_FLOW_RSHIFT, f->rshift))
 595                goto nla_put_failure;
 596        if (f->addend &&
 597            nla_put_u32(skb, TCA_FLOW_ADDEND, f->addend))
 598                goto nla_put_failure;
 599
 600        if (f->divisor &&
 601            nla_put_u32(skb, TCA_FLOW_DIVISOR, f->divisor))
 602                goto nla_put_failure;
 603        if (f->baseclass &&
 604            nla_put_u32(skb, TCA_FLOW_BASECLASS, f->baseclass))
 605                goto nla_put_failure;
 606
 607        if (f->perturb_period &&
 608            nla_put_u32(skb, TCA_FLOW_PERTURB, f->perturb_period / HZ))
 609                goto nla_put_failure;
 610
 611        if (tcf_exts_dump(skb, &f->exts, &flow_ext_map) < 0)
 612                goto nla_put_failure;
 613#ifdef CONFIG_NET_EMATCH
 614        if (f->ematches.hdr.nmatches &&
 615            tcf_em_tree_dump(skb, &f->ematches, TCA_FLOW_EMATCHES) < 0)
 616                goto nla_put_failure;
 617#endif
 618        nla_nest_end(skb, nest);
 619
 620        if (tcf_exts_dump_stats(skb, &f->exts, &flow_ext_map) < 0)
 621                goto nla_put_failure;
 622
 623        return skb->len;
 624
 625nla_put_failure:
 626        nlmsg_trim(skb, nest);
 627        return -1;
 628}
 629
 630static void flow_walk(struct tcf_proto *tp, struct tcf_walker *arg)
 631{
 632        struct flow_head *head = tp->root;
 633        struct flow_filter *f;
 634
 635        list_for_each_entry(f, &head->filters, list) {
 636                if (arg->count < arg->skip)
 637                        goto skip;
 638                if (arg->fn(tp, (unsigned long)f, arg) < 0) {
 639                        arg->stop = 1;
 640                        break;
 641                }
 642skip:
 643                arg->count++;
 644        }
 645}
 646
 647static struct tcf_proto_ops cls_flow_ops __read_mostly = {
 648        .kind           = "flow",
 649        .classify       = flow_classify,
 650        .init           = flow_init,
 651        .destroy        = flow_destroy,
 652        .change         = flow_change,
 653        .delete         = flow_delete,
 654        .get            = flow_get,
 655        .put            = flow_put,
 656        .dump           = flow_dump,
 657        .walk           = flow_walk,
 658        .owner          = THIS_MODULE,
 659};
 660
 661static int __init cls_flow_init(void)
 662{
 663        return register_tcf_proto_ops(&cls_flow_ops);
 664}
 665
 666static void __exit cls_flow_exit(void)
 667{
 668        unregister_tcf_proto_ops(&cls_flow_ops);
 669}
 670
 671module_init(cls_flow_init);
 672module_exit(cls_flow_exit);
 673
 674MODULE_LICENSE("GPL");
 675MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
 676MODULE_DESCRIPTION("TC flow classifier");
 677
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