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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Berkeley Packet Filter based traffic classifier
4 *
5 * Might be used to classify traffic through flexible, user-defined and
6 * possibly JIT-ed BPF filters for traffic control as an alternative to
7 * ematches.
8 *
9 * (C) 2013 Daniel Borkmann <dborkman@redhat.com>
10 */
11
12#include <linux/module.h>
13#include <linux/types.h>
14#include <linux/skbuff.h>
15#include <linux/filter.h>
16#include <linux/bpf.h>
17#include <linux/idr.h>
18
19#include <net/rtnetlink.h>
20#include <net/pkt_cls.h>
21#include <net/sock.h>
22
23MODULE_LICENSE("GPL");
24MODULE_AUTHOR("Daniel Borkmann <dborkman@redhat.com>");
25MODULE_DESCRIPTION("TC BPF based classifier");
26
27#define CLS_BPF_NAME_LEN 256
28#define CLS_BPF_SUPPORTED_GEN_FLAGS \
29 (TCA_CLS_FLAGS_SKIP_HW | TCA_CLS_FLAGS_SKIP_SW)
30
31struct cls_bpf_head {
32 struct list_head plist;
33 struct idr handle_idr;
34 struct rcu_head rcu;
35};
36
37struct cls_bpf_prog {
38 struct bpf_prog *filter;
39 struct list_head link;
40 struct tcf_result res;
41 bool exts_integrated;
42 u32 gen_flags;
43 unsigned int in_hw_count;
44 struct tcf_exts exts;
45 u32 handle;
46 u16 bpf_num_ops;
47 struct sock_filter *bpf_ops;
48 const char *bpf_name;
49 struct tcf_proto *tp;
50 struct rcu_work rwork;
51};
52
53static const struct nla_policy bpf_policy[TCA_BPF_MAX + 1] = {
54 [TCA_BPF_CLASSID] = { .type = NLA_U32 },
55 [TCA_BPF_FLAGS] = { .type = NLA_U32 },
56 [TCA_BPF_FLAGS_GEN] = { .type = NLA_U32 },
57 [TCA_BPF_FD] = { .type = NLA_U32 },
58 [TCA_BPF_NAME] = { .type = NLA_NUL_STRING,
59 .len = CLS_BPF_NAME_LEN },
60 [TCA_BPF_OPS_LEN] = { .type = NLA_U16 },
61 [TCA_BPF_OPS] = { .type = NLA_BINARY,
62 .len = sizeof(struct sock_filter) * BPF_MAXINSNS },
63};
64
65static int cls_bpf_exec_opcode(int code)
66{
67 switch (code) {
68 case TC_ACT_OK:
69 case TC_ACT_SHOT:
70 case TC_ACT_STOLEN:
71 case TC_ACT_TRAP:
72 case TC_ACT_REDIRECT:
73 case TC_ACT_UNSPEC:
74 return code;
75 default:
76 return TC_ACT_UNSPEC;
77 }
78}
79
80static int cls_bpf_classify(struct sk_buff *skb, const struct tcf_proto *tp,
81 struct tcf_result *res)
82{
83 struct cls_bpf_head *head = rcu_dereference_bh(tp->root);
84 bool at_ingress = skb_at_tc_ingress(skb);
85 struct cls_bpf_prog *prog;
86 int ret = -1;
87
88 /* Needed here for accessing maps. */
89 rcu_read_lock();
90 list_for_each_entry_rcu(prog, &head->plist, link) {
91 int filter_res;
92
93 qdisc_skb_cb(skb)->tc_classid = prog->res.classid;
94
95 if (tc_skip_sw(prog->gen_flags)) {
96 filter_res = prog->exts_integrated ? TC_ACT_UNSPEC : 0;
97 } else if (at_ingress) {
98 /* It is safe to push/pull even if skb_shared() */
99 __skb_push(skb, skb->mac_len);
100 bpf_compute_data_pointers(skb);
101 filter_res = BPF_PROG_RUN(prog->filter, skb);
102 __skb_pull(skb, skb->mac_len);
103 } else {
104 bpf_compute_data_pointers(skb);
105 filter_res = BPF_PROG_RUN(prog->filter, skb);
106 }
107
108 if (prog->exts_integrated) {
109 res->class = 0;
110 res->classid = TC_H_MAJ(prog->res.classid) |
111 qdisc_skb_cb(skb)->tc_classid;
112
113 ret = cls_bpf_exec_opcode(filter_res);
114 if (ret == TC_ACT_UNSPEC)
115 continue;
116 break;
117 }
118
119 if (filter_res == 0)
120 continue;
121 if (filter_res != -1) {
122 res->class = 0;
123 res->classid = filter_res;
124 } else {
125 *res = prog->res;
126 }
127
128 ret = tcf_exts_exec(skb, &prog->exts, res);
129 if (ret < 0)
130 continue;
131
132 break;
133 }
134 rcu_read_unlock();
135
136 return ret;
137}
138
139static bool cls_bpf_is_ebpf(const struct cls_bpf_prog *prog)
140{
141 return !prog->bpf_ops;
142}
143
144static int cls_bpf_offload_cmd(struct tcf_proto *tp, struct cls_bpf_prog *prog,
145 struct cls_bpf_prog *oldprog,
146 struct netlink_ext_ack *extack)
147{
148 struct tcf_block *block = tp->chain->block;
149 struct tc_cls_bpf_offload cls_bpf = {};
150 struct cls_bpf_prog *obj;
151 bool skip_sw;
152 int err;
153
154 skip_sw = prog && tc_skip_sw(prog->gen_flags);
155 obj = prog ?: oldprog;
156
157 tc_cls_common_offload_init(&cls_bpf.common, tp, obj->gen_flags, extack);
158 cls_bpf.command = TC_CLSBPF_OFFLOAD;
159 cls_bpf.exts = &obj->exts;
160 cls_bpf.prog = prog ? prog->filter : NULL;
161 cls_bpf.oldprog = oldprog ? oldprog->filter : NULL;
162 cls_bpf.name = obj->bpf_name;
163 cls_bpf.exts_integrated = obj->exts_integrated;
164
165 if (oldprog && prog)
166 err = tc_setup_cb_replace(block, tp, TC_SETUP_CLSBPF, &cls_bpf,
167 skip_sw, &oldprog->gen_flags,
168 &oldprog->in_hw_count,
169 &prog->gen_flags, &prog->in_hw_count,
170 true);
171 else if (prog)
172 err = tc_setup_cb_add(block, tp, TC_SETUP_CLSBPF, &cls_bpf,
173 skip_sw, &prog->gen_flags,
174 &prog->in_hw_count, true);
175 else
176 err = tc_setup_cb_destroy(block, tp, TC_SETUP_CLSBPF, &cls_bpf,
177 skip_sw, &oldprog->gen_flags,
178 &oldprog->in_hw_count, true);
179
180 if (prog && err) {
181 cls_bpf_offload_cmd(tp, oldprog, prog, extack);
182 return err;
183 }
184
185 if (prog && skip_sw && !(prog->gen_flags & TCA_CLS_FLAGS_IN_HW))
186 return -EINVAL;
187
188 return 0;
189}
190
191static u32 cls_bpf_flags(u32 flags)
192{
193 return flags & CLS_BPF_SUPPORTED_GEN_FLAGS;
194}
195
196static int cls_bpf_offload(struct tcf_proto *tp, struct cls_bpf_prog *prog,
197 struct cls_bpf_prog *oldprog,
198 struct netlink_ext_ack *extack)
199{
200 if (prog && oldprog &&
201 cls_bpf_flags(prog->gen_flags) !=
202 cls_bpf_flags(oldprog->gen_flags))
203 return -EINVAL;
204
205 if (prog && tc_skip_hw(prog->gen_flags))
206 prog = NULL;
207 if (oldprog && tc_skip_hw(oldprog->gen_flags))
208 oldprog = NULL;
209 if (!prog && !oldprog)
210 return 0;
211
212 return cls_bpf_offload_cmd(tp, prog, oldprog, extack);
213}
214
215static void cls_bpf_stop_offload(struct tcf_proto *tp,
216 struct cls_bpf_prog *prog,
217 struct netlink_ext_ack *extack)
218{
219 int err;
220
221 err = cls_bpf_offload_cmd(tp, NULL, prog, extack);
222 if (err)
223 pr_err("Stopping hardware offload failed: %d\n", err);
224}
225
226static void cls_bpf_offload_update_stats(struct tcf_proto *tp,
227 struct cls_bpf_prog *prog)
228{
229 struct tcf_block *block = tp->chain->block;
230 struct tc_cls_bpf_offload cls_bpf = {};
231
232 tc_cls_common_offload_init(&cls_bpf.common, tp, prog->gen_flags, NULL);
233 cls_bpf.command = TC_CLSBPF_STATS;
234 cls_bpf.exts = &prog->exts;
235 cls_bpf.prog = prog->filter;
236 cls_bpf.name = prog->bpf_name;
237 cls_bpf.exts_integrated = prog->exts_integrated;
238
239 tc_setup_cb_call(block, TC_SETUP_CLSBPF, &cls_bpf, false, true);
240}
241
242static int cls_bpf_init(struct tcf_proto *tp)
243{
244 struct cls_bpf_head *head;
245
246 head = kzalloc(sizeof(*head), GFP_KERNEL);
247 if (head == NULL)
248 return -ENOBUFS;
249
250 INIT_LIST_HEAD_RCU(&head->plist);
251 idr_init(&head->handle_idr);
252 rcu_assign_pointer(tp->root, head);
253
254 return 0;
255}
256
257static void cls_bpf_free_parms(struct cls_bpf_prog *prog)
258{
259 if (cls_bpf_is_ebpf(prog))
260 bpf_prog_put(prog->filter);
261 else
262 bpf_prog_destroy(prog->filter);
263
264 kfree(prog->bpf_name);
265 kfree(prog->bpf_ops);
266}
267
268static void __cls_bpf_delete_prog(struct cls_bpf_prog *prog)
269{
270 tcf_exts_destroy(&prog->exts);
271 tcf_exts_put_net(&prog->exts);
272
273 cls_bpf_free_parms(prog);
274 kfree(prog);
275}
276
277static void cls_bpf_delete_prog_work(struct work_struct *work)
278{
279 struct cls_bpf_prog *prog = container_of(to_rcu_work(work),
280 struct cls_bpf_prog,
281 rwork);
282 rtnl_lock();
283 __cls_bpf_delete_prog(prog);
284 rtnl_unlock();
285}
286
287static void __cls_bpf_delete(struct tcf_proto *tp, struct cls_bpf_prog *prog,
288 struct netlink_ext_ack *extack)
289{
290 struct cls_bpf_head *head = rtnl_dereference(tp->root);
291
292 idr_remove(&head->handle_idr, prog->handle);
293 cls_bpf_stop_offload(tp, prog, extack);
294 list_del_rcu(&prog->link);
295 tcf_unbind_filter(tp, &prog->res);
296 if (tcf_exts_get_net(&prog->exts))
297 tcf_queue_work(&prog->rwork, cls_bpf_delete_prog_work);
298 else
299 __cls_bpf_delete_prog(prog);
300}
301
302static int cls_bpf_delete(struct tcf_proto *tp, void *arg, bool *last,
303 bool rtnl_held, struct netlink_ext_ack *extack)
304{
305 struct cls_bpf_head *head = rtnl_dereference(tp->root);
306
307 __cls_bpf_delete(tp, arg, extack);
308 *last = list_empty(&head->plist);
309 return 0;
310}
311
312static void cls_bpf_destroy(struct tcf_proto *tp, bool rtnl_held,
313 struct netlink_ext_ack *extack)
314{
315 struct cls_bpf_head *head = rtnl_dereference(tp->root);
316 struct cls_bpf_prog *prog, *tmp;
317
318 list_for_each_entry_safe(prog, tmp, &head->plist, link)
319 __cls_bpf_delete(tp, prog, extack);
320
321 idr_destroy(&head->handle_idr);
322 kfree_rcu(head, rcu);
323}
324
325static void *cls_bpf_get(struct tcf_proto *tp, u32 handle)
326{
327 struct cls_bpf_head *head = rtnl_dereference(tp->root);
328 struct cls_bpf_prog *prog;
329
330 list_for_each_entry(prog, &head->plist, link) {
331 if (prog->handle == handle)
332 return prog;
333 }
334
335 return NULL;
336}
337
338static int cls_bpf_prog_from_ops(struct nlattr **tb, struct cls_bpf_prog *prog)
339{
340 struct sock_filter *bpf_ops;
341 struct sock_fprog_kern fprog_tmp;
342 struct bpf_prog *fp;
343 u16 bpf_size, bpf_num_ops;
344 int ret;
345
346 bpf_num_ops = nla_get_u16(tb[TCA_BPF_OPS_LEN]);
347 if (bpf_num_ops > BPF_MAXINSNS || bpf_num_ops == 0)
348 return -EINVAL;
349
350 bpf_size = bpf_num_ops * sizeof(*bpf_ops);
351 if (bpf_size != nla_len(tb[TCA_BPF_OPS]))
352 return -EINVAL;
353
354 bpf_ops = kmemdup(nla_data(tb[TCA_BPF_OPS]), bpf_size, GFP_KERNEL);
355 if (bpf_ops == NULL)
356 return -ENOMEM;
357
358 fprog_tmp.len = bpf_num_ops;
359 fprog_tmp.filter = bpf_ops;
360
361 ret = bpf_prog_create(&fp, &fprog_tmp);
362 if (ret < 0) {
363 kfree(bpf_ops);
364 return ret;
365 }
366
367 prog->bpf_ops = bpf_ops;
368 prog->bpf_num_ops = bpf_num_ops;
369 prog->bpf_name = NULL;
370 prog->filter = fp;
371
372 return 0;
373}
374
375static int cls_bpf_prog_from_efd(struct nlattr **tb, struct cls_bpf_prog *prog,
376 u32 gen_flags, const struct tcf_proto *tp)
377{
378 struct bpf_prog *fp;
379 char *name = NULL;
380 bool skip_sw;
381 u32 bpf_fd;
382
383 bpf_fd = nla_get_u32(tb[TCA_BPF_FD]);
384 skip_sw = gen_flags & TCA_CLS_FLAGS_SKIP_SW;
385
386 fp = bpf_prog_get_type_dev(bpf_fd, BPF_PROG_TYPE_SCHED_CLS, skip_sw);
387 if (IS_ERR(fp))
388 return PTR_ERR(fp);
389
390 if (tb[TCA_BPF_NAME]) {
391 name = nla_memdup(tb[TCA_BPF_NAME], GFP_KERNEL);
392 if (!name) {
393 bpf_prog_put(fp);
394 return -ENOMEM;
395 }
396 }
397
398 prog->bpf_ops = NULL;
399 prog->bpf_name = name;
400 prog->filter = fp;
401
402 if (fp->dst_needed)
403 tcf_block_netif_keep_dst(tp->chain->block);
404
405 return 0;
406}
407
408static int cls_bpf_set_parms(struct net *net, struct tcf_proto *tp,
409 struct cls_bpf_prog *prog, unsigned long base,
410 struct nlattr **tb, struct nlattr *est, bool ovr,
411 struct netlink_ext_ack *extack)
412{
413 bool is_bpf, is_ebpf, have_exts = false;
414 u32 gen_flags = 0;
415 int ret;
416
417 is_bpf = tb[TCA_BPF_OPS_LEN] && tb[TCA_BPF_OPS];
418 is_ebpf = tb[TCA_BPF_FD];
419 if ((!is_bpf && !is_ebpf) || (is_bpf && is_ebpf))
420 return -EINVAL;
421
422 ret = tcf_exts_validate(net, tp, tb, est, &prog->exts, ovr, true,
423 extack);
424 if (ret < 0)
425 return ret;
426
427 if (tb[TCA_BPF_FLAGS]) {
428 u32 bpf_flags = nla_get_u32(tb[TCA_BPF_FLAGS]);
429
430 if (bpf_flags & ~TCA_BPF_FLAG_ACT_DIRECT)
431 return -EINVAL;
432
433 have_exts = bpf_flags & TCA_BPF_FLAG_ACT_DIRECT;
434 }
435 if (tb[TCA_BPF_FLAGS_GEN]) {
436 gen_flags = nla_get_u32(tb[TCA_BPF_FLAGS_GEN]);
437 if (gen_flags & ~CLS_BPF_SUPPORTED_GEN_FLAGS ||
438 !tc_flags_valid(gen_flags))
439 return -EINVAL;
440 }
441
442 prog->exts_integrated = have_exts;
443 prog->gen_flags = gen_flags;
444
445 ret = is_bpf ? cls_bpf_prog_from_ops(tb, prog) :
446 cls_bpf_prog_from_efd(tb, prog, gen_flags, tp);
447 if (ret < 0)
448 return ret;
449
450 if (tb[TCA_BPF_CLASSID]) {
451 prog->res.classid = nla_get_u32(tb[TCA_BPF_CLASSID]);
452 tcf_bind_filter(tp, &prog->res, base);
453 }
454
455 return 0;
456}
457
458static int cls_bpf_change(struct net *net, struct sk_buff *in_skb,
459 struct tcf_proto *tp, unsigned long base,
460 u32 handle, struct nlattr **tca,
461 void **arg, bool ovr, bool rtnl_held,
462 struct netlink_ext_ack *extack)
463{
464 struct cls_bpf_head *head = rtnl_dereference(tp->root);
465 struct cls_bpf_prog *oldprog = *arg;
466 struct nlattr *tb[TCA_BPF_MAX + 1];
467 struct cls_bpf_prog *prog;
468 int ret;
469
470 if (tca[TCA_OPTIONS] == NULL)
471 return -EINVAL;
472
473 ret = nla_parse_nested_deprecated(tb, TCA_BPF_MAX, tca[TCA_OPTIONS],
474 bpf_policy, NULL);
475 if (ret < 0)
476 return ret;
477
478 prog = kzalloc(sizeof(*prog), GFP_KERNEL);
479 if (!prog)
480 return -ENOBUFS;
481
482 ret = tcf_exts_init(&prog->exts, net, TCA_BPF_ACT, TCA_BPF_POLICE);
483 if (ret < 0)
484 goto errout;
485
486 if (oldprog) {
487 if (handle && oldprog->handle != handle) {
488 ret = -EINVAL;
489 goto errout;
490 }
491 }
492
493 if (handle == 0) {
494 handle = 1;
495 ret = idr_alloc_u32(&head->handle_idr, prog, &handle,
496 INT_MAX, GFP_KERNEL);
497 } else if (!oldprog) {
498 ret = idr_alloc_u32(&head->handle_idr, prog, &handle,
499 handle, GFP_KERNEL);
500 }
501
502 if (ret)
503 goto errout;
504 prog->handle = handle;
505
506 ret = cls_bpf_set_parms(net, tp, prog, base, tb, tca[TCA_RATE], ovr,
507 extack);
508 if (ret < 0)
509 goto errout_idr;
510
511 ret = cls_bpf_offload(tp, prog, oldprog, extack);
512 if (ret)
513 goto errout_parms;
514
515 if (!tc_in_hw(prog->gen_flags))
516 prog->gen_flags |= TCA_CLS_FLAGS_NOT_IN_HW;
517
518 if (oldprog) {
519 idr_replace(&head->handle_idr, prog, handle);
520 list_replace_rcu(&oldprog->link, &prog->link);
521 tcf_unbind_filter(tp, &oldprog->res);
522 tcf_exts_get_net(&oldprog->exts);
523 tcf_queue_work(&oldprog->rwork, cls_bpf_delete_prog_work);
524 } else {
525 list_add_rcu(&prog->link, &head->plist);
526 }
527
528 *arg = prog;
529 return 0;
530
531errout_parms:
532 cls_bpf_free_parms(prog);
533errout_idr:
534 if (!oldprog)
535 idr_remove(&head->handle_idr, prog->handle);
536errout:
537 tcf_exts_destroy(&prog->exts);
538 kfree(prog);
539 return ret;
540}
541
542static int cls_bpf_dump_bpf_info(const struct cls_bpf_prog *prog,
543 struct sk_buff *skb)
544{
545 struct nlattr *nla;
546
547 if (nla_put_u16(skb, TCA_BPF_OPS_LEN, prog->bpf_num_ops))
548 return -EMSGSIZE;
549
550 nla = nla_reserve(skb, TCA_BPF_OPS, prog->bpf_num_ops *
551 sizeof(struct sock_filter));
552 if (nla == NULL)
553 return -EMSGSIZE;
554
555 memcpy(nla_data(nla), prog->bpf_ops, nla_len(nla));
556
557 return 0;
558}
559
560static int cls_bpf_dump_ebpf_info(const struct cls_bpf_prog *prog,
561 struct sk_buff *skb)
562{
563 struct nlattr *nla;
564
565 if (prog->bpf_name &&
566 nla_put_string(skb, TCA_BPF_NAME, prog->bpf_name))
567 return -EMSGSIZE;
568
569 if (nla_put_u32(skb, TCA_BPF_ID, prog->filter->aux->id))
570 return -EMSGSIZE;
571
572 nla = nla_reserve(skb, TCA_BPF_TAG, sizeof(prog->filter->tag));
573 if (nla == NULL)
574 return -EMSGSIZE;
575
576 memcpy(nla_data(nla), prog->filter->tag, nla_len(nla));
577
578 return 0;
579}
580
581static int cls_bpf_dump(struct net *net, struct tcf_proto *tp, void *fh,
582 struct sk_buff *skb, struct tcmsg *tm, bool rtnl_held)
583{
584 struct cls_bpf_prog *prog = fh;
585 struct nlattr *nest;
586 u32 bpf_flags = 0;
587 int ret;
588
589 if (prog == NULL)
590 return skb->len;
591
592 tm->tcm_handle = prog->handle;
593
594 cls_bpf_offload_update_stats(tp, prog);
595
596 nest = nla_nest_start_noflag(skb, TCA_OPTIONS);
597 if (nest == NULL)
598 goto nla_put_failure;
599
600 if (prog->res.classid &&
601 nla_put_u32(skb, TCA_BPF_CLASSID, prog->res.classid))
602 goto nla_put_failure;
603
604 if (cls_bpf_is_ebpf(prog))
605 ret = cls_bpf_dump_ebpf_info(prog, skb);
606 else
607 ret = cls_bpf_dump_bpf_info(prog, skb);
608 if (ret)
609 goto nla_put_failure;
610
611 if (tcf_exts_dump(skb, &prog->exts) < 0)
612 goto nla_put_failure;
613
614 if (prog->exts_integrated)
615 bpf_flags |= TCA_BPF_FLAG_ACT_DIRECT;
616 if (bpf_flags && nla_put_u32(skb, TCA_BPF_FLAGS, bpf_flags))
617 goto nla_put_failure;
618 if (prog->gen_flags &&
619 nla_put_u32(skb, TCA_BPF_FLAGS_GEN, prog->gen_flags))
620 goto nla_put_failure;
621
622 nla_nest_end(skb, nest);
623
624 if (tcf_exts_dump_stats(skb, &prog->exts) < 0)
625 goto nla_put_failure;
626
627 return skb->len;
628
629nla_put_failure:
630 nla_nest_cancel(skb, nest);
631 return -1;
632}
633
634static void cls_bpf_bind_class(void *fh, u32 classid, unsigned long cl,
635 void *q, unsigned long base)
636{
637 struct cls_bpf_prog *prog = fh;
638
639 if (prog && prog->res.classid == classid) {
640 if (cl)
641 __tcf_bind_filter(q, &prog->res, base);
642 else
643 __tcf_unbind_filter(q, &prog->res);
644 }
645}
646
647static void cls_bpf_walk(struct tcf_proto *tp, struct tcf_walker *arg,
648 bool rtnl_held)
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 }
660skip:
661 arg->count++;
662 }
663}
664
665static int cls_bpf_reoffload(struct tcf_proto *tp, bool add, flow_setup_cb_t *cb,
666 void *cb_priv, struct netlink_ext_ack *extack)
667{
668 struct cls_bpf_head *head = rtnl_dereference(tp->root);
669 struct tcf_block *block = tp->chain->block;
670 struct tc_cls_bpf_offload cls_bpf = {};
671 struct cls_bpf_prog *prog;
672 int err;
673
674 list_for_each_entry(prog, &head->plist, link) {
675 if (tc_skip_hw(prog->gen_flags))
676 continue;
677
678 tc_cls_common_offload_init(&cls_bpf.common, tp, prog->gen_flags,
679 extack);
680 cls_bpf.command = TC_CLSBPF_OFFLOAD;
681 cls_bpf.exts = &prog->exts;
682 cls_bpf.prog = add ? prog->filter : NULL;
683 cls_bpf.oldprog = add ? NULL : prog->filter;
684 cls_bpf.name = prog->bpf_name;
685 cls_bpf.exts_integrated = prog->exts_integrated;
686
687 err = tc_setup_cb_reoffload(block, tp, add, cb, TC_SETUP_CLSBPF,
688 &cls_bpf, cb_priv, &prog->gen_flags,
689 &prog->in_hw_count);
690 if (err)
691 return err;
692 }
693
694 return 0;
695}
696
697static struct tcf_proto_ops cls_bpf_ops __read_mostly = {
698 .kind = "bpf",
699 .owner = THIS_MODULE,
700 .classify = cls_bpf_classify,
701 .init = cls_bpf_init,
702 .destroy = cls_bpf_destroy,
703 .get = cls_bpf_get,
704 .change = cls_bpf_change,
705 .delete = cls_bpf_delete,
706 .walk = cls_bpf_walk,
707 .reoffload = cls_bpf_reoffload,
708 .dump = cls_bpf_dump,
709 .bind_class = cls_bpf_bind_class,
710};
711
712static int __init cls_bpf_init_mod(void)
713{
714 return register_tcf_proto_ops(&cls_bpf_ops);
715}
716
717static void __exit cls_bpf_exit_mod(void)
718{
719 unregister_tcf_proto_ops(&cls_bpf_ops);
720}
721
722module_init(cls_bpf_init_mod);
723module_exit(cls_bpf_exit_mod);