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