net/sched/cls_bpf.c

   1 /*
   2  * Berkeley Packet Filter based traffic classifier
   3  *
   4  * Might be used to classify traffic through flexible, user-defined and
   5  * possibly JIT-ed BPF filters for traffic control as an alternative to
   6  * ematches.
   7  *
   8  * (C) 2013 Daniel Borkmann <dborkman@redhat.com>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2 as
  12  * published by the Free Software Foundation.
  13  */
  14
  15 #include <linux/module.h>
  16 #include <linux/types.h>
  17 #include <linux/skbuff.h>
  18 #include <linux/filter.h>
  19 #include <linux/bpf.h>
  20
  21 #include <net/rtnetlink.h>
  22 #include <net/pkt_cls.h>
  23 #include <net/sock.h>
  24
  25 MODULE_LICENSE("GPL");
  26 MODULE_AUTHOR("Daniel Borkmann <dborkman@redhat.com>");
  27 MODULE_DESCRIPTION("TC BPF based classifier");
  28
  29 #define CLS_BPF_NAME_LEN        256
  30 #define CLS_BPF_SUPPORTED_GEN_FLAGS             \
  31         (TCA_CLS_FLAGS_SKIP_HW | TCA_CLS_FLAGS_SKIP_SW)
  32
  33 struct cls_bpf_head {
  34         struct list_head plist;
  35         u32 hgen;
  36         struct rcu_head rcu;
  37 };
  38
  39 struct cls_bpf_prog {
  40         struct bpf_prog *filter;
  41         struct list_head link;
  42         struct tcf_result res;
  43         bool exts_integrated;
  44         bool offloaded;
  45         u32 gen_flags;
  46         struct tcf_exts exts;
  47         u32 handle;
  48         union {
  49                 u32 bpf_fd;
  50                 u16 bpf_num_ops;
  51         };
  52         struct sock_filter *bpf_ops;
  53         const char *bpf_name;
  54         struct tcf_proto *tp;
  55         struct rcu_head rcu;
  56 };
  57
  58 static const struct nla_policy bpf_policy[TCA_BPF_MAX + 1] = {
  59         [TCA_BPF_CLASSID]       = { .type = NLA_U32 },
  60         [TCA_BPF_FLAGS]         = { .type = NLA_U32 },
  61         [TCA_BPF_FLAGS_GEN]     = { .type = NLA_U32 },
  62         [TCA_BPF_FD]            = { .type = NLA_U32 },
  63         [TCA_BPF_NAME]          = { .type = NLA_NUL_STRING,
  64                                     .len = CLS_BPF_NAME_LEN },
  65         [TCA_BPF_OPS_LEN]       = { .type = NLA_U16 },
  66         [TCA_BPF_OPS]           = { .type = NLA_BINARY,
  67                                     .len = sizeof(struct sock_filter) * BPF_MAXINSNS },
  68 };
  69
  70 static int cls_bpf_exec_opcode(int code)
  71 {
  72         switch (code) {
  73         case TC_ACT_OK:
  74         case TC_ACT_SHOT:
  75         case TC_ACT_STOLEN:
  76         case TC_ACT_REDIRECT:
  77         case TC_ACT_UNSPEC:
  78                 return code;
  79         default:
  80                 return TC_ACT_UNSPEC;
  81         }
  82 }
  83
  84 static int cls_bpf_classify(struct sk_buff *skb, const struct tcf_proto *tp,
  85                             struct tcf_result *res)
  86 {
  87         struct cls_bpf_head *head = rcu_dereference_bh(tp->root);
  88         bool at_ingress = skb_at_tc_ingress(skb);
  89         struct cls_bpf_prog *prog;
  90         int ret = -1;
  91
  92         /* Needed here for accessing maps. */
  93         rcu_read_lock();
  94         list_for_each_entry_rcu(prog, &head->plist, link) {
  95                 int filter_res;
  96
  97                 qdisc_skb_cb(skb)->tc_classid = prog->res.classid;
  98
  99                 if (tc_skip_sw(prog->gen_flags)) {
 100                         filter_res = prog->exts_integrated ? TC_ACT_UNSPEC : 0;
 101                 } else if (at_ingress) {
 102                         /* It is safe to push/pull even if skb_shared() */
 103                         __skb_push(skb, skb->mac_len);
 104                         bpf_compute_data_end(skb);
 105                         filter_res = BPF_PROG_RUN(prog->filter, skb);
 106                         __skb_pull(skb, skb->mac_len);
 107                 } else {
 108                         bpf_compute_data_end(skb);
 109                         filter_res = BPF_PROG_RUN(prog->filter, skb);
 110                 }
 111
 112                 if (prog->exts_integrated) {
 113                         res->class   = 0;
 114                         res->classid = TC_H_MAJ(prog->res.classid) |
 115                                        qdisc_skb_cb(skb)->tc_classid;
 116
 117                         ret = cls_bpf_exec_opcode(filter_res);
 118                         if (ret == TC_ACT_UNSPEC)
 119                                 continue;
 120                         break;
 121                 }
 122
 123                 if (filter_res == 0)
 124                         continue;
 125                 if (filter_res != -1) {
 126                         res->class   = 0;
 127                         res->classid = filter_res;
 128                 } else {
 129                         *res = prog->res;
 130                 }
 131
 132                 ret = tcf_exts_exec(skb, &prog->exts, res);
 133                 if (ret < 0)
 134                         continue;
 135
 136                 break;
 137         }
 138         rcu_read_unlock();
 139
 140         return ret;
 141 }
 142
 143 static bool cls_bpf_is_ebpf(const struct cls_bpf_prog *prog)
 144 {
 145         return !prog->bpf_ops;
 146 }
 147
 148 static int cls_bpf_offload_cmd(struct tcf_proto *tp, struct cls_bpf_prog *prog,
 149                                enum tc_clsbpf_command cmd)
 150 {
 151         struct net_device *dev = tp->q->dev_queue->dev;
 152         struct tc_cls_bpf_offload bpf_offload = {};
 153         struct tc_to_netdev offload;
 154
 155         offload.type = TC_SETUP_CLSBPF;
 156         offload.cls_bpf = &bpf_offload;
 157
 158         bpf_offload.command = cmd;
 159         bpf_offload.exts = &prog->exts;
 160         bpf_offload.prog = prog->filter;
 161         bpf_offload.name = prog->bpf_name;
 162         bpf_offload.exts_integrated = prog->exts_integrated;
 163         bpf_offload.gen_flags = prog->gen_flags;
 164
 165         return dev->netdev_ops->ndo_setup_tc(dev, tp->q->handle,
 166                                              tp->protocol, &offload);
 167 }
 168
 169 static int cls_bpf_offload(struct tcf_proto *tp, struct cls_bpf_prog *prog,
 170                            struct cls_bpf_prog *oldprog)
 171 {
 172         struct net_device *dev = tp->q->dev_queue->dev;
 173         struct cls_bpf_prog *obj = prog;
 174         enum tc_clsbpf_command cmd;
 175         bool skip_sw;
 176         int ret;
 177
 178         skip_sw = tc_skip_sw(prog->gen_flags) ||
 179                 (oldprog && tc_skip_sw(oldprog->gen_flags));
 180
 181         if (oldprog && oldprog->offloaded) {
 182                 if (tc_should_offload(dev, tp, prog->gen_flags)) {
 183                         cmd = TC_CLSBPF_REPLACE;
 184                 } else if (!tc_skip_sw(prog->gen_flags)) {
 185                         obj = oldprog;
 186                         cmd = TC_CLSBPF_DESTROY;
 187                 } else {
 188                         return -EINVAL;
 189                 }
 190         } else {
 191                 if (!tc_should_offload(dev, tp, prog->gen_flags))
 192                         return skip_sw ? -EINVAL : 0;
 193                 cmd = TC_CLSBPF_ADD;
 194         }
 195
 196         ret = cls_bpf_offload_cmd(tp, obj, cmd);
 197         if (ret)
 198                 return skip_sw ? ret : 0;
 199
 200         obj->offloaded = true;
 201         if (oldprog)
 202                 oldprog->offloaded = false;
 203
 204         return 0;
 205 }
 206
 207 static void cls_bpf_stop_offload(struct tcf_proto *tp,
 208                                  struct cls_bpf_prog *prog)
 209 {
 210         int err;
 211
 212         if (!prog->offloaded)
 213                 return;
 214
 215         err = cls_bpf_offload_cmd(tp, prog, TC_CLSBPF_DESTROY);
 216         if (err) {
 217                 pr_err("Stopping hardware offload failed: %d\n", err);
 218                 return;
 219         }
 220
 221         prog->offloaded = false;
 222 }
 223
 224 static void cls_bpf_offload_update_stats(struct tcf_proto *tp,
 225                                          struct cls_bpf_prog *prog)
 226 {
 227         if (!prog->offloaded)
 228                 return;
 229
 230         cls_bpf_offload_cmd(tp, prog, TC_CLSBPF_STATS);
 231 }
 232
 233 static int cls_bpf_init(struct tcf_proto *tp)
 234 {
 235         struct cls_bpf_head *head;
 236
 237         head = kzalloc(sizeof(*head), GFP_KERNEL);
 238         if (head == NULL)
 239                 return -ENOBUFS;
 240
 241         INIT_LIST_HEAD_RCU(&head->plist);
 242         rcu_assign_pointer(tp->root, head);
 243
 244         return 0;
 245 }
 246
 247 static void cls_bpf_delete_prog(struct tcf_proto *tp, struct cls_bpf_prog *prog)
 248 {
 249         tcf_exts_destroy(&prog->exts);
 250
 251         if (cls_bpf_is_ebpf(prog))
 252                 bpf_prog_put(prog->filter);
 253         else
 254                 bpf_prog_destroy(prog->filter);
 255
 256         kfree(prog->bpf_name);
 257         kfree(prog->bpf_ops);
 258         kfree(prog);
 259 }
 260
 261 static void __cls_bpf_delete_prog(struct rcu_head *rcu)
 262 {
 263         struct cls_bpf_prog *prog = container_of(rcu, struct cls_bpf_prog, rcu);
 264
 265         cls_bpf_delete_prog(prog->tp, prog);
 266 }
 267
 268 static int cls_bpf_delete(struct tcf_proto *tp, unsigned long arg)
 269 {
 270         struct cls_bpf_prog *prog = (struct cls_bpf_prog *) arg;
 271
 272         cls_bpf_stop_offload(tp, prog);
 273         list_del_rcu(&prog->link);
 274         tcf_unbind_filter(tp, &prog->res);
 275         call_rcu(&prog->rcu, __cls_bpf_delete_prog);
 276
 277         return 0;
 278 }
 279
 280 static bool cls_bpf_destroy(struct tcf_proto *tp, bool force)
 281 {
 282         struct cls_bpf_head *head = rtnl_dereference(tp->root);
 283         struct cls_bpf_prog *prog, *tmp;
 284
 285         if (!force && !list_empty(&head->plist))
 286                 return false;
 287
 288         list_for_each_entry_safe(prog, tmp, &head->plist, link) {
 289                 cls_bpf_stop_offload(tp, prog);
 290                 list_del_rcu(&prog->link);
 291                 tcf_unbind_filter(tp, &prog->res);
 292                 call_rcu(&prog->rcu, __cls_bpf_delete_prog);
 293         }
 294
 295         RCU_INIT_POINTER(tp->root, NULL);
 296         kfree_rcu(head, rcu);
 297         return true;
 298 }
 299
 300 static unsigned long cls_bpf_get(struct tcf_proto *tp, u32 handle)
 301 {
 302         struct cls_bpf_head *head = rtnl_dereference(tp->root);
 303         struct cls_bpf_prog *prog;
 304         unsigned long ret = 0UL;
 305
 306         if (head == NULL)
 307                 return 0UL;
 308
 309         list_for_each_entry(prog, &head->plist, link) {
 310                 if (prog->handle == handle) {
 311                         ret = (unsigned long) prog;
 312                         break;
 313                 }
 314         }
 315
 316         return ret;
 317 }
 318
 319 static int cls_bpf_prog_from_ops(struct nlattr **tb, struct cls_bpf_prog *prog)
 320 {
 321         struct sock_filter *bpf_ops;
 322         struct sock_fprog_kern fprog_tmp;
 323         struct bpf_prog *fp;
 324         u16 bpf_size, bpf_num_ops;
 325         int ret;
 326
 327         bpf_num_ops = nla_get_u16(tb[TCA_BPF_OPS_LEN]);
 328         if (bpf_num_ops > BPF_MAXINSNS || bpf_num_ops == 0)
 329                 return -EINVAL;
 330
 331         bpf_size = bpf_num_ops * sizeof(*bpf_ops);
 332         if (bpf_size != nla_len(tb[TCA_BPF_OPS]))
 333                 return -EINVAL;
 334
 335         bpf_ops = kzalloc(bpf_size, GFP_KERNEL);
 336         if (bpf_ops == NULL)
 337                 return -ENOMEM;
 338
 339         memcpy(bpf_ops, nla_data(tb[TCA_BPF_OPS]), bpf_size);
 340
 341         fprog_tmp.len = bpf_num_ops;
 342         fprog_tmp.filter = bpf_ops;
 343
 344         ret = bpf_prog_create(&fp, &fprog_tmp);
 345         if (ret < 0) {
 346                 kfree(bpf_ops);
 347                 return ret;
 348         }
 349
 350         prog->bpf_ops = bpf_ops;
 351         prog->bpf_num_ops = bpf_num_ops;
 352         prog->bpf_name = NULL;
 353         prog->filter = fp;
 354
 355         return 0;
 356 }
 357
 358 static int cls_bpf_prog_from_efd(struct nlattr **tb, struct cls_bpf_prog *prog,
 359                                  const struct tcf_proto *tp)
 360 {
 361         struct bpf_prog *fp;
 362         char *name = NULL;
 363         u32 bpf_fd;
 364
 365         bpf_fd = nla_get_u32(tb[TCA_BPF_FD]);
 366
 367         fp = bpf_prog_get_type(bpf_fd, BPF_PROG_TYPE_SCHED_CLS);
 368         if (IS_ERR(fp))
 369                 return PTR_ERR(fp);
 370
 371         if (tb[TCA_BPF_NAME]) {
 372                 name = kmemdup(nla_data(tb[TCA_BPF_NAME]),
 373                                nla_len(tb[TCA_BPF_NAME]),
 374                                GFP_KERNEL);
 375                 if (!name) {
 376                         bpf_prog_put(fp);
 377                         return -ENOMEM;
 378                 }
 379         }
 380
 381         prog->bpf_ops = NULL;
 382         prog->bpf_fd = bpf_fd;
 383         prog->bpf_name = name;
 384         prog->filter = fp;
 385
 386         if (fp->dst_needed && !(tp->q->flags & TCQ_F_INGRESS))
 387                 netif_keep_dst(qdisc_dev(tp->q));
 388
 389         return 0;
 390 }
 391
 392 static int cls_bpf_modify_existing(struct net *net, struct tcf_proto *tp,
 393                                    struct cls_bpf_prog *prog,
 394                                    unsigned long base, struct nlattr **tb,
 395                                    struct nlattr *est, bool ovr)
 396 {
 397         bool is_bpf, is_ebpf, have_exts = false;
 398         struct tcf_exts exts;
 399         u32 gen_flags = 0;
 400         int ret;
 401
 402         is_bpf = tb[TCA_BPF_OPS_LEN] && tb[TCA_BPF_OPS];
 403         is_ebpf = tb[TCA_BPF_FD];
 404         if ((!is_bpf && !is_ebpf) || (is_bpf && is_ebpf))
 405                 return -EINVAL;
 406
 407         ret = tcf_exts_init(&exts, TCA_BPF_ACT, TCA_BPF_POLICE);
 408         if (ret < 0)
 409                 return ret;
 410         ret = tcf_exts_validate(net, tp, tb, est, &exts, ovr);
 411         if (ret < 0)
 412                 goto errout;
 413
 414         if (tb[TCA_BPF_FLAGS]) {
 415                 u32 bpf_flags = nla_get_u32(tb[TCA_BPF_FLAGS]);
 416
 417                 if (bpf_flags & ~TCA_BPF_FLAG_ACT_DIRECT) {
 418                         ret = -EINVAL;
 419                         goto errout;
 420                 }
 421
 422                 have_exts = bpf_flags & TCA_BPF_FLAG_ACT_DIRECT;
 423         }
 424         if (tb[TCA_BPF_FLAGS_GEN]) {
 425                 gen_flags = nla_get_u32(tb[TCA_BPF_FLAGS_GEN]);
 426                 if (gen_flags & ~CLS_BPF_SUPPORTED_GEN_FLAGS ||
 427                     !tc_flags_valid(gen_flags)) {
 428                         ret = -EINVAL;
 429                         goto errout;
 430                 }
 431         }
 432
 433         prog->exts_integrated = have_exts;
 434         prog->gen_flags = gen_flags;
 435
 436         ret = is_bpf ? cls_bpf_prog_from_ops(tb, prog) :
 437                        cls_bpf_prog_from_efd(tb, prog, tp);
 438         if (ret < 0)
 439                 goto errout;
 440
 441         if (tb[TCA_BPF_CLASSID]) {
 442                 prog->res.classid = nla_get_u32(tb[TCA_BPF_CLASSID]);
 443                 tcf_bind_filter(tp, &prog->res, base);
 444         }
 445
 446         tcf_exts_change(tp, &prog->exts, &exts);
 447         return 0;
 448
 449 errout:
 450         tcf_exts_destroy(&exts);
 451         return ret;
 452 }
 453
 454 static u32 cls_bpf_grab_new_handle(struct tcf_proto *tp,
 455                                    struct cls_bpf_head *head)
 456 {
 457         unsigned int i = 0x80000000;
 458         u32 handle;
 459
 460         do {
 461                 if (++head->hgen == 0x7FFFFFFF)
 462                         head->hgen = 1;
 463         } while (--i > 0 && cls_bpf_get(tp, head->hgen));
 464
 465         if (unlikely(i == 0)) {
 466                 pr_err("Insufficient number of handles\n");
 467                 handle = 0;
 468         } else {
 469                 handle = head->hgen;
 470         }
 471
 472         return handle;
 473 }
 474
 475 static int cls_bpf_change(struct net *net, struct sk_buff *in_skb,
 476                           struct tcf_proto *tp, unsigned long base,
 477                           u32 handle, struct nlattr **tca,
 478                           unsigned long *arg, bool ovr)
 479 {
 480         struct cls_bpf_head *head = rtnl_dereference(tp->root);
 481         struct cls_bpf_prog *oldprog = (struct cls_bpf_prog *) *arg;
 482         struct nlattr *tb[TCA_BPF_MAX + 1];
 483         struct cls_bpf_prog *prog;
 484         int ret;
 485
 486         if (tca[TCA_OPTIONS] == NULL)
 487                 return -EINVAL;
 488
 489         ret = nla_parse_nested(tb, TCA_BPF_MAX, tca[TCA_OPTIONS], bpf_policy);
 490         if (ret < 0)
 491                 return ret;
 492
 493         prog = kzalloc(sizeof(*prog), GFP_KERNEL);
 494         if (!prog)
 495                 return -ENOBUFS;
 496
 497         ret = tcf_exts_init(&prog->exts, TCA_BPF_ACT, TCA_BPF_POLICE);
 498         if (ret < 0)
 499                 goto errout;
 500
 501         if (oldprog) {
 502                 if (handle && oldprog->handle != handle) {
 503                         ret = -EINVAL;
 504                         goto errout;
 505                 }
 506         }
 507
 508         if (handle == 0)
 509                 prog->handle = cls_bpf_grab_new_handle(tp, head);
 510         else
 511                 prog->handle = handle;
 512         if (prog->handle == 0) {
 513                 ret = -EINVAL;
 514                 goto errout;
 515         }
 516
 517         ret = cls_bpf_modify_existing(net, tp, prog, base, tb, tca[TCA_RATE],
 518                                       ovr);
 519         if (ret < 0)
 520                 goto errout;
 521
 522         ret = cls_bpf_offload(tp, prog, oldprog);
 523         if (ret) {
 524                 cls_bpf_delete_prog(tp, prog);
 525                 return ret;
 526         }
 527
 528         if (oldprog) {
 529                 list_replace_rcu(&oldprog->link, &prog->link);
 530                 tcf_unbind_filter(tp, &oldprog->res);
 531                 call_rcu(&oldprog->rcu, __cls_bpf_delete_prog);
 532         } else {
 533                 list_add_rcu(&prog->link, &head->plist);
 534         }
 535
 536         *arg = (unsigned long) prog;
 537         return 0;
 538
 539 errout:
 540         tcf_exts_destroy(&prog->exts);
 541         kfree(prog);
 542         return ret;
 543 }
 544
 545 static int cls_bpf_dump_bpf_info(const struct cls_bpf_prog *prog,
 546                                  struct sk_buff *skb)
 547 {
 548         struct nlattr *nla;
 549
 550         if (nla_put_u16(skb, TCA_BPF_OPS_LEN, prog->bpf_num_ops))
 551                 return -EMSGSIZE;
 552
 553         nla = nla_reserve(skb, TCA_BPF_OPS, prog->bpf_num_ops *
 554                           sizeof(struct sock_filter));
 555         if (nla == NULL)
 556                 return -EMSGSIZE;
 557
 558         memcpy(nla_data(nla), prog->bpf_ops, nla_len(nla));
 559
 560         return 0;
 561 }
 562
 563 static int cls_bpf_dump_ebpf_info(const struct cls_bpf_prog *prog,
 564                                   struct sk_buff *skb)
 565 {
 566         if (nla_put_u32(skb, TCA_BPF_FD, prog->bpf_fd))
 567                 return -EMSGSIZE;
 568
 569         if (prog->bpf_name &&
 570             nla_put_string(skb, TCA_BPF_NAME, prog->bpf_name))
 571                 return -EMSGSIZE;
 572
 573         return 0;
 574 }
 575
 576 static int cls_bpf_dump(struct net *net, struct tcf_proto *tp, unsigned long fh,
 577                         struct sk_buff *skb, struct tcmsg *tm)
 578 {
 579         struct cls_bpf_prog *prog = (struct cls_bpf_prog *) fh;
 580         struct nlattr *nest;
 581         u32 bpf_flags = 0;
 582         int ret;
 583
 584         if (prog == NULL)
 585                 return skb->len;
 586
 587         tm->tcm_handle = prog->handle;
 588
 589         cls_bpf_offload_update_stats(tp, prog);
 590
 591         nest = nla_nest_start(skb, TCA_OPTIONS);
 592         if (nest == NULL)
 593                 goto nla_put_failure;
 594
 595         if (prog->res.classid &&
 596             nla_put_u32(skb, TCA_BPF_CLASSID, prog->res.classid))
 597                 goto nla_put_failure;
 598
 599         if (cls_bpf_is_ebpf(prog))
 600                 ret = cls_bpf_dump_ebpf_info(prog, skb);
 601         else
 602                 ret = cls_bpf_dump_bpf_info(prog, skb);
 603         if (ret)
 604                 goto nla_put_failure;
 605
 606         if (tcf_exts_dump(skb, &prog->exts) < 0)
 607                 goto nla_put_failure;
 608
 609         if (prog->exts_integrated)
 610                 bpf_flags |= TCA_BPF_FLAG_ACT_DIRECT;
 611         if (bpf_flags && nla_put_u32(skb, TCA_BPF_FLAGS, bpf_flags))
 612                 goto nla_put_failure;
 613         if (prog->gen_flags &&
 614             nla_put_u32(skb, TCA_BPF_FLAGS_GEN, prog->gen_flags))
 615                 goto nla_put_failure;
 616
 617         nla_nest_end(skb, nest);
 618
 619         if (tcf_exts_dump_stats(skb, &prog->exts) < 0)
 620                 goto nla_put_failure;
 621
 622         return skb->len;
 623
 624 nla_put_failure:
 625         nla_nest_cancel(skb, nest);
 626         return -1;
 627 }
 628
 629 static void cls_bpf_walk(struct tcf_proto *tp, struct tcf_walker *arg)
 630 {
 631         struct cls_bpf_head *head = rtnl_dereference(tp->root);
 632         struct cls_bpf_prog *prog;
 633
 634         list_for_each_entry(prog, &head->plist, link) {
 635                 if (arg->count < arg->skip)
 636                         goto skip;
 637                 if (arg->fn(tp, (unsigned long) prog, arg) < 0) {
 638                         arg->stop = 1;
 639                         break;
 640                 }
 641 skip:
 642                 arg->count++;
 643         }
 644 }
 645
 646 static struct tcf_proto_ops cls_bpf_ops __read_mostly = {
 647         .kind           =       "bpf",
 648         .owner          =       THIS_MODULE,
 649         .classify       =       cls_bpf_classify,
 650         .init           =       cls_bpf_init,
 651         .destroy        =       cls_bpf_destroy,
 652         .get            =       cls_bpf_get,
 653         .change         =       cls_bpf_change,
 654         .delete         =       cls_bpf_delete,
 655         .walk           =       cls_bpf_walk,
 656         .dump           =       cls_bpf_dump,
 657 };
 658
 659 static int __init cls_bpf_init_mod(void)
 660 {
 661         return register_tcf_proto_ops(&cls_bpf_ops);
 662 }
 663
 664 static void __exit cls_bpf_exit_mod(void)
 665 {
 666         unregister_tcf_proto_ops(&cls_bpf_ops);
 667 }
 668
 669 module_init(cls_bpf_init_mod);
 670 module_exit(cls_bpf_exit_mod);