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Linux/net/sched/cls_bpf.c

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  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 #include <linux/idr.h>
 21 
 22 #include <net/rtnetlink.h>
 23 #include <net/pkt_cls.h>
 24 #include <net/sock.h>
 25 
 26 MODULE_LICENSE("GPL");
 27 MODULE_AUTHOR("Daniel Borkmann <dborkman@redhat.com>");
 28 MODULE_DESCRIPTION("TC BPF based classifier");
 29 
 30 #define CLS_BPF_NAME_LEN        256
 31 #define CLS_BPF_SUPPORTED_GEN_FLAGS             \
 32         (TCA_CLS_FLAGS_SKIP_HW | TCA_CLS_FLAGS_SKIP_SW)
 33 
 34 struct cls_bpf_head {
 35         struct list_head plist;
 36         struct idr handle_idr;
 37         struct rcu_head rcu;
 38 };
 39 
 40 struct cls_bpf_prog {
 41         struct bpf_prog *filter;
 42         struct list_head link;
 43         struct tcf_result res;
 44         bool exts_integrated;
 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         union {
 53                 struct work_struct work;
 54                 struct rcu_head rcu;
 55         };
 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_TRAP:
 77         case TC_ACT_REDIRECT:
 78         case TC_ACT_UNSPEC:
 79                 return code;
 80         default:
 81                 return TC_ACT_UNSPEC;
 82         }
 83 }
 84 
 85 static int cls_bpf_classify(struct sk_buff *skb, const struct tcf_proto *tp,
 86                             struct tcf_result *res)
 87 {
 88         struct cls_bpf_head *head = rcu_dereference_bh(tp->root);
 89         bool at_ingress = skb_at_tc_ingress(skb);
 90         struct cls_bpf_prog *prog;
 91         int ret = -1;
 92 
 93         /* Needed here for accessing maps. */
 94         rcu_read_lock();
 95         list_for_each_entry_rcu(prog, &head->plist, link) {
 96                 int filter_res;
 97 
 98                 qdisc_skb_cb(skb)->tc_classid = prog->res.classid;
 99 
100                 if (tc_skip_sw(prog->gen_flags)) {
101                         filter_res = prog->exts_integrated ? TC_ACT_UNSPEC : 0;
102                 } else if (at_ingress) {
103                         /* It is safe to push/pull even if skb_shared() */
104                         __skb_push(skb, skb->mac_len);
105                         bpf_compute_data_pointers(skb);
106                         filter_res = BPF_PROG_RUN(prog->filter, skb);
107                         __skb_pull(skb, skb->mac_len);
108                 } else {
109                         bpf_compute_data_pointers(skb);
110                         filter_res = BPF_PROG_RUN(prog->filter, skb);
111                 }
112 
113                 if (prog->exts_integrated) {
114                         res->class   = 0;
115                         res->classid = TC_H_MAJ(prog->res.classid) |
116                                        qdisc_skb_cb(skb)->tc_classid;
117 
118                         ret = cls_bpf_exec_opcode(filter_res);
119                         if (ret == TC_ACT_UNSPEC)
120                                 continue;
121                         break;
122                 }
123 
124                 if (filter_res == 0)
125                         continue;
126                 if (filter_res != -1) {
127                         res->class   = 0;
128                         res->classid = filter_res;
129                 } else {
130                         *res = prog->res;
131                 }
132 
133                 ret = tcf_exts_exec(skb, &prog->exts, res);
134                 if (ret < 0)
135                         continue;
136 
137                 break;
138         }
139         rcu_read_unlock();
140 
141         return ret;
142 }
143 
144 static bool cls_bpf_is_ebpf(const struct cls_bpf_prog *prog)
145 {
146         return !prog->bpf_ops;
147 }
148 
149 static int cls_bpf_offload_cmd(struct tcf_proto *tp, struct cls_bpf_prog *prog,
150                                struct cls_bpf_prog *oldprog,
151                                struct netlink_ext_ack *extack)
152 {
153         struct tcf_block *block = tp->chain->block;
154         struct tc_cls_bpf_offload cls_bpf = {};
155         struct cls_bpf_prog *obj;
156         bool skip_sw;
157         int err;
158 
159         skip_sw = prog && tc_skip_sw(prog->gen_flags);
160         obj = prog ?: oldprog;
161 
162         tc_cls_common_offload_init(&cls_bpf.common, tp, obj->gen_flags,
163                                    extack);
164         cls_bpf.command = TC_CLSBPF_OFFLOAD;
165         cls_bpf.exts = &obj->exts;
166         cls_bpf.prog = prog ? prog->filter : NULL;
167         cls_bpf.oldprog = oldprog ? oldprog->filter : NULL;
168         cls_bpf.name = obj->bpf_name;
169         cls_bpf.exts_integrated = obj->exts_integrated;
170 
171         if (oldprog)
172                 tcf_block_offload_dec(block, &oldprog->gen_flags);
173 
174         err = tc_setup_cb_call(block, NULL, TC_SETUP_CLSBPF, &cls_bpf, skip_sw);
175         if (prog) {
176                 if (err < 0) {
177                         cls_bpf_offload_cmd(tp, oldprog, prog, extack);
178                         return err;
179                 } else if (err > 0) {
180                         tcf_block_offload_inc(block, &prog->gen_flags);
181                 }
182         }
183 
184         if (prog && skip_sw && !(prog->gen_flags & TCA_CLS_FLAGS_IN_HW))
185                 return -EINVAL;
186 
187         return 0;
188 }
189 
190 static u32 cls_bpf_flags(u32 flags)
191 {
192         return flags & CLS_BPF_SUPPORTED_GEN_FLAGS;
193 }
194 
195 static int cls_bpf_offload(struct tcf_proto *tp, struct cls_bpf_prog *prog,
196                            struct cls_bpf_prog *oldprog,
197                            struct netlink_ext_ack *extack)
198 {
199         if (prog && oldprog &&
200             cls_bpf_flags(prog->gen_flags) !=
201             cls_bpf_flags(oldprog->gen_flags))
202                 return -EINVAL;
203 
204         if (prog && tc_skip_hw(prog->gen_flags))
205                 prog = NULL;
206         if (oldprog && tc_skip_hw(oldprog->gen_flags))
207                 oldprog = NULL;
208         if (!prog && !oldprog)
209                 return 0;
210 
211         return cls_bpf_offload_cmd(tp, prog, oldprog, extack);
212 }
213 
214 static void cls_bpf_stop_offload(struct tcf_proto *tp,
215                                  struct cls_bpf_prog *prog,
216                                  struct netlink_ext_ack *extack)
217 {
218         int err;
219 
220         err = cls_bpf_offload_cmd(tp, NULL, prog, extack);
221         if (err)
222                 pr_err("Stopping hardware offload failed: %d\n", err);
223 }
224 
225 static void cls_bpf_offload_update_stats(struct tcf_proto *tp,
226                                          struct cls_bpf_prog *prog)
227 {
228         struct tcf_block *block = tp->chain->block;
229         struct tc_cls_bpf_offload cls_bpf = {};
230 
231         tc_cls_common_offload_init(&cls_bpf.common, tp, prog->gen_flags, NULL);
232         cls_bpf.command = TC_CLSBPF_STATS;
233         cls_bpf.exts = &prog->exts;
234         cls_bpf.prog = prog->filter;
235         cls_bpf.name = prog->bpf_name;
236         cls_bpf.exts_integrated = prog->exts_integrated;
237 
238         tc_setup_cb_call(block, NULL, TC_SETUP_CLSBPF, &cls_bpf, false);
239 }
240 
241 static int cls_bpf_init(struct tcf_proto *tp)
242 {
243         struct cls_bpf_head *head;
244 
245         head = kzalloc(sizeof(*head), GFP_KERNEL);
246         if (head == NULL)
247                 return -ENOBUFS;
248 
249         INIT_LIST_HEAD_RCU(&head->plist);
250         idr_init(&head->handle_idr);
251         rcu_assign_pointer(tp->root, head);
252 
253         return 0;
254 }
255 
256 static void cls_bpf_free_parms(struct cls_bpf_prog *prog)
257 {
258         if (cls_bpf_is_ebpf(prog))
259                 bpf_prog_put(prog->filter);
260         else
261                 bpf_prog_destroy(prog->filter);
262 
263         kfree(prog->bpf_name);
264         kfree(prog->bpf_ops);
265 }
266 
267 static void __cls_bpf_delete_prog(struct cls_bpf_prog *prog)
268 {
269         tcf_exts_destroy(&prog->exts);
270         tcf_exts_put_net(&prog->exts);
271 
272         cls_bpf_free_parms(prog);
273         kfree(prog);
274 }
275 
276 static void cls_bpf_delete_prog_work(struct work_struct *work)
277 {
278         struct cls_bpf_prog *prog = container_of(work, struct cls_bpf_prog, work);
279 
280         rtnl_lock();
281         __cls_bpf_delete_prog(prog);
282         rtnl_unlock();
283 }
284 
285 static void cls_bpf_delete_prog_rcu(struct rcu_head *rcu)
286 {
287         struct cls_bpf_prog *prog = container_of(rcu, struct cls_bpf_prog, rcu);
288 
289         INIT_WORK(&prog->work, cls_bpf_delete_prog_work);
290         tcf_queue_work(&prog->work);
291 }
292 
293 static void __cls_bpf_delete(struct tcf_proto *tp, struct cls_bpf_prog *prog,
294                              struct netlink_ext_ack *extack)
295 {
296         struct cls_bpf_head *head = rtnl_dereference(tp->root);
297 
298         idr_remove(&head->handle_idr, prog->handle);
299         cls_bpf_stop_offload(tp, prog, extack);
300         list_del_rcu(&prog->link);
301         tcf_unbind_filter(tp, &prog->res);
302         if (tcf_exts_get_net(&prog->exts))
303                 call_rcu(&prog->rcu, cls_bpf_delete_prog_rcu);
304         else
305                 __cls_bpf_delete_prog(prog);
306 }
307 
308 static int cls_bpf_delete(struct tcf_proto *tp, void *arg, bool *last,
309                           struct netlink_ext_ack *extack)
310 {
311         struct cls_bpf_head *head = rtnl_dereference(tp->root);
312 
313         __cls_bpf_delete(tp, arg, extack);
314         *last = list_empty(&head->plist);
315         return 0;
316 }
317 
318 static void cls_bpf_destroy(struct tcf_proto *tp,
319                             struct netlink_ext_ack *extack)
320 {
321         struct cls_bpf_head *head = rtnl_dereference(tp->root);
322         struct cls_bpf_prog *prog, *tmp;
323 
324         list_for_each_entry_safe(prog, tmp, &head->plist, link)
325                 __cls_bpf_delete(tp, prog, extack);
326 
327         idr_destroy(&head->handle_idr);
328         kfree_rcu(head, rcu);
329 }
330 
331 static void *cls_bpf_get(struct tcf_proto *tp, u32 handle)
332 {
333         struct cls_bpf_head *head = rtnl_dereference(tp->root);
334         struct cls_bpf_prog *prog;
335 
336         list_for_each_entry(prog, &head->plist, link) {
337                 if (prog->handle == handle)
338                         return prog;
339         }
340 
341         return NULL;
342 }
343 
344 static int cls_bpf_prog_from_ops(struct nlattr **tb, struct cls_bpf_prog *prog)
345 {
346         struct sock_filter *bpf_ops;
347         struct sock_fprog_kern fprog_tmp;
348         struct bpf_prog *fp;
349         u16 bpf_size, bpf_num_ops;
350         int ret;
351 
352         bpf_num_ops = nla_get_u16(tb[TCA_BPF_OPS_LEN]);
353         if (bpf_num_ops > BPF_MAXINSNS || bpf_num_ops == 0)
354                 return -EINVAL;
355 
356         bpf_size = bpf_num_ops * sizeof(*bpf_ops);
357         if (bpf_size != nla_len(tb[TCA_BPF_OPS]))
358                 return -EINVAL;
359 
360         bpf_ops = kzalloc(bpf_size, GFP_KERNEL);
361         if (bpf_ops == NULL)
362                 return -ENOMEM;
363 
364         memcpy(bpf_ops, nla_data(tb[TCA_BPF_OPS]), bpf_size);
365 
366         fprog_tmp.len = bpf_num_ops;
367         fprog_tmp.filter = bpf_ops;
368 
369         ret = bpf_prog_create(&fp, &fprog_tmp);
370         if (ret < 0) {
371                 kfree(bpf_ops);
372                 return ret;
373         }
374 
375         prog->bpf_ops = bpf_ops;
376         prog->bpf_num_ops = bpf_num_ops;
377         prog->bpf_name = NULL;
378         prog->filter = fp;
379 
380         return 0;
381 }
382 
383 static int cls_bpf_prog_from_efd(struct nlattr **tb, struct cls_bpf_prog *prog,
384                                  u32 gen_flags, const struct tcf_proto *tp)
385 {
386         struct bpf_prog *fp;
387         char *name = NULL;
388         bool skip_sw;
389         u32 bpf_fd;
390 
391         bpf_fd = nla_get_u32(tb[TCA_BPF_FD]);
392         skip_sw = gen_flags & TCA_CLS_FLAGS_SKIP_SW;
393 
394         fp = bpf_prog_get_type_dev(bpf_fd, BPF_PROG_TYPE_SCHED_CLS, skip_sw);
395         if (IS_ERR(fp))
396                 return PTR_ERR(fp);
397 
398         if (tb[TCA_BPF_NAME]) {
399                 name = nla_memdup(tb[TCA_BPF_NAME], GFP_KERNEL);
400                 if (!name) {
401                         bpf_prog_put(fp);
402                         return -ENOMEM;
403                 }
404         }
405 
406         prog->bpf_ops = NULL;
407         prog->bpf_name = name;
408         prog->filter = fp;
409 
410         if (fp->dst_needed)
411                 tcf_block_netif_keep_dst(tp->chain->block);
412 
413         return 0;
414 }
415 
416 static int cls_bpf_set_parms(struct net *net, struct tcf_proto *tp,
417                              struct cls_bpf_prog *prog, unsigned long base,
418                              struct nlattr **tb, struct nlattr *est, bool ovr,
419                              struct netlink_ext_ack *extack)
420 {
421         bool is_bpf, is_ebpf, have_exts = false;
422         u32 gen_flags = 0;
423         int ret;
424 
425         is_bpf = tb[TCA_BPF_OPS_LEN] && tb[TCA_BPF_OPS];
426         is_ebpf = tb[TCA_BPF_FD];
427         if ((!is_bpf && !is_ebpf) || (is_bpf && is_ebpf))
428                 return -EINVAL;
429 
430         ret = tcf_exts_validate(net, tp, tb, est, &prog->exts, ovr, extack);
431         if (ret < 0)
432                 return ret;
433 
434         if (tb[TCA_BPF_FLAGS]) {
435                 u32 bpf_flags = nla_get_u32(tb[TCA_BPF_FLAGS]);
436 
437                 if (bpf_flags & ~TCA_BPF_FLAG_ACT_DIRECT)
438                         return -EINVAL;
439 
440                 have_exts = bpf_flags & TCA_BPF_FLAG_ACT_DIRECT;
441         }
442         if (tb[TCA_BPF_FLAGS_GEN]) {
443                 gen_flags = nla_get_u32(tb[TCA_BPF_FLAGS_GEN]);
444                 if (gen_flags & ~CLS_BPF_SUPPORTED_GEN_FLAGS ||
445                     !tc_flags_valid(gen_flags))
446                         return -EINVAL;
447         }
448 
449         prog->exts_integrated = have_exts;
450         prog->gen_flags = gen_flags;
451 
452         ret = is_bpf ? cls_bpf_prog_from_ops(tb, prog) :
453                        cls_bpf_prog_from_efd(tb, prog, gen_flags, tp);
454         if (ret < 0)
455                 return ret;
456 
457         if (tb[TCA_BPF_CLASSID]) {
458                 prog->res.classid = nla_get_u32(tb[TCA_BPF_CLASSID]);
459                 tcf_bind_filter(tp, &prog->res, base);
460         }
461 
462         return 0;
463 }
464 
465 static int cls_bpf_change(struct net *net, struct sk_buff *in_skb,
466                           struct tcf_proto *tp, unsigned long base,
467                           u32 handle, struct nlattr **tca,
468                           void **arg, bool ovr, struct netlink_ext_ack *extack)
469 {
470         struct cls_bpf_head *head = rtnl_dereference(tp->root);
471         struct cls_bpf_prog *oldprog = *arg;
472         struct nlattr *tb[TCA_BPF_MAX + 1];
473         struct cls_bpf_prog *prog;
474         int ret;
475 
476         if (tca[TCA_OPTIONS] == NULL)
477                 return -EINVAL;
478 
479         ret = nla_parse_nested(tb, TCA_BPF_MAX, tca[TCA_OPTIONS], bpf_policy,
480                                NULL);
481         if (ret < 0)
482                 return ret;
483 
484         prog = kzalloc(sizeof(*prog), GFP_KERNEL);
485         if (!prog)
486                 return -ENOBUFS;
487 
488         ret = tcf_exts_init(&prog->exts, TCA_BPF_ACT, TCA_BPF_POLICE);
489         if (ret < 0)
490                 goto errout;
491 
492         if (oldprog) {
493                 if (handle && oldprog->handle != handle) {
494                         ret = -EINVAL;
495                         goto errout;
496                 }
497         }
498 
499         if (handle == 0) {
500                 handle = 1;
501                 ret = idr_alloc_u32(&head->handle_idr, prog, &handle,
502                                     INT_MAX, GFP_KERNEL);
503         } else if (!oldprog) {
504                 ret = idr_alloc_u32(&head->handle_idr, prog, &handle,
505                                     handle, GFP_KERNEL);
506         }
507 
508         if (ret)
509                 goto errout;
510         prog->handle = handle;
511 
512         ret = cls_bpf_set_parms(net, tp, prog, base, tb, tca[TCA_RATE], ovr,
513                                 extack);
514         if (ret < 0)
515                 goto errout_idr;
516 
517         ret = cls_bpf_offload(tp, prog, oldprog, extack);
518         if (ret)
519                 goto errout_parms;
520 
521         if (!tc_in_hw(prog->gen_flags))
522                 prog->gen_flags |= TCA_CLS_FLAGS_NOT_IN_HW;
523 
524         if (oldprog) {
525                 idr_replace(&head->handle_idr, prog, handle);
526                 list_replace_rcu(&oldprog->link, &prog->link);
527                 tcf_unbind_filter(tp, &oldprog->res);
528                 tcf_exts_get_net(&oldprog->exts);
529                 call_rcu(&oldprog->rcu, cls_bpf_delete_prog_rcu);
530         } else {
531                 list_add_rcu(&prog->link, &head->plist);
532         }
533 
534         *arg = prog;
535         return 0;
536 
537 errout_parms:
538         cls_bpf_free_parms(prog);
539 errout_idr:
540         if (!oldprog)
541                 idr_remove(&head->handle_idr, prog->handle);
542 errout:
543         tcf_exts_destroy(&prog->exts);
544         kfree(prog);
545         return ret;
546 }
547 
548 static int cls_bpf_dump_bpf_info(const struct cls_bpf_prog *prog,
549                                  struct sk_buff *skb)
550 {
551         struct nlattr *nla;
552 
553         if (nla_put_u16(skb, TCA_BPF_OPS_LEN, prog->bpf_num_ops))
554                 return -EMSGSIZE;
555 
556         nla = nla_reserve(skb, TCA_BPF_OPS, prog->bpf_num_ops *
557                           sizeof(struct sock_filter));
558         if (nla == NULL)
559                 return -EMSGSIZE;
560 
561         memcpy(nla_data(nla), prog->bpf_ops, nla_len(nla));
562 
563         return 0;
564 }
565 
566 static int cls_bpf_dump_ebpf_info(const struct cls_bpf_prog *prog,
567                                   struct sk_buff *skb)
568 {
569         struct nlattr *nla;
570 
571         if (prog->bpf_name &&
572             nla_put_string(skb, TCA_BPF_NAME, prog->bpf_name))
573                 return -EMSGSIZE;
574 
575         if (nla_put_u32(skb, TCA_BPF_ID, prog->filter->aux->id))
576                 return -EMSGSIZE;
577 
578         nla = nla_reserve(skb, TCA_BPF_TAG, sizeof(prog->filter->tag));
579         if (nla == NULL)
580                 return -EMSGSIZE;
581 
582         memcpy(nla_data(nla), prog->filter->tag, nla_len(nla));
583 
584         return 0;
585 }
586 
587 static int cls_bpf_dump(struct net *net, struct tcf_proto *tp, void *fh,
588                         struct sk_buff *skb, struct tcmsg *tm)
589 {
590         struct cls_bpf_prog *prog = fh;
591         struct nlattr *nest;
592         u32 bpf_flags = 0;
593         int ret;
594 
595         if (prog == NULL)
596                 return skb->len;
597 
598         tm->tcm_handle = prog->handle;
599 
600         cls_bpf_offload_update_stats(tp, prog);
601 
602         nest = nla_nest_start(skb, TCA_OPTIONS);
603         if (nest == NULL)
604                 goto nla_put_failure;
605 
606         if (prog->res.classid &&
607             nla_put_u32(skb, TCA_BPF_CLASSID, prog->res.classid))
608                 goto nla_put_failure;
609 
610         if (cls_bpf_is_ebpf(prog))
611                 ret = cls_bpf_dump_ebpf_info(prog, skb);
612         else
613                 ret = cls_bpf_dump_bpf_info(prog, skb);
614         if (ret)
615                 goto nla_put_failure;
616 
617         if (tcf_exts_dump(skb, &prog->exts) < 0)
618                 goto nla_put_failure;
619 
620         if (prog->exts_integrated)
621                 bpf_flags |= TCA_BPF_FLAG_ACT_DIRECT;
622         if (bpf_flags && nla_put_u32(skb, TCA_BPF_FLAGS, bpf_flags))
623                 goto nla_put_failure;
624         if (prog->gen_flags &&
625             nla_put_u32(skb, TCA_BPF_FLAGS_GEN, prog->gen_flags))
626                 goto nla_put_failure;
627 
628         nla_nest_end(skb, nest);
629 
630         if (tcf_exts_dump_stats(skb, &prog->exts) < 0)
631                 goto nla_put_failure;
632 
633         return skb->len;
634 
635 nla_put_failure:
636         nla_nest_cancel(skb, nest);
637         return -1;
638 }
639 
640 static void cls_bpf_bind_class(void *fh, u32 classid, unsigned long cl)
641 {
642         struct cls_bpf_prog *prog = fh;
643 
644         if (prog && prog->res.classid == classid)
645                 prog->res.class = cl;
646 }
647 
648 static void cls_bpf_walk(struct tcf_proto *tp, struct tcf_walker *arg)
649 {
650         struct cls_bpf_head *head = rtnl_dereference(tp->root);
651         struct cls_bpf_prog *prog;
652 
653         list_for_each_entry(prog, &head->plist, link) {
654                 if (arg->count < arg->skip)
655                         goto skip;
656                 if (arg->fn(tp, prog, arg) < 0) {
657                         arg->stop = 1;
658                         break;
659                 }
660 skip:
661                 arg->count++;
662         }
663 }
664 
665 static struct tcf_proto_ops cls_bpf_ops __read_mostly = {
666         .kind           =       "bpf",
667         .owner          =       THIS_MODULE,
668         .classify       =       cls_bpf_classify,
669         .init           =       cls_bpf_init,
670         .destroy        =       cls_bpf_destroy,
671         .get            =       cls_bpf_get,
672         .change         =       cls_bpf_change,
673         .delete         =       cls_bpf_delete,
674         .walk           =       cls_bpf_walk,
675         .dump           =       cls_bpf_dump,
676         .bind_class     =       cls_bpf_bind_class,
677 };
678 
679 static int __init cls_bpf_init_mod(void)
680 {
681         return register_tcf_proto_ops(&cls_bpf_ops);
682 }
683 
684 static void __exit cls_bpf_exit_mod(void)
685 {
686         unregister_tcf_proto_ops(&cls_bpf_ops);
687 }
688 
689 module_init(cls_bpf_init_mod);
690 module_exit(cls_bpf_exit_mod);
691 

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