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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 list_for_each_entry_rcu(prog, &head->plist, link) {
89 int filter_res;
90
91 qdisc_skb_cb(skb)->tc_classid = prog->res.classid;
92
93 if (tc_skip_sw(prog->gen_flags)) {
94 filter_res = prog->exts_integrated ? TC_ACT_UNSPEC : 0;
95 } else if (at_ingress) {
96 /* It is safe to push/pull even if skb_shared() */
97 __skb_push(skb, skb->mac_len);
98 bpf_compute_data_pointers(skb);
99 filter_res = BPF_PROG_RUN(prog->filter, skb);
100 __skb_pull(skb, skb->mac_len);
101 } else {
102 bpf_compute_data_pointers(skb);
103 filter_res = BPF_PROG_RUN(prog->filter, skb);
104 }
105
106 if (prog->exts_integrated) {
107 res->class = 0;
108 res->classid = TC_H_MAJ(prog->res.classid) |
109 qdisc_skb_cb(skb)->tc_classid;
110
111 ret = cls_bpf_exec_opcode(filter_res);
112 if (ret == TC_ACT_UNSPEC)
113 continue;
114 break;
115 }
116
117 if (filter_res == 0)
118 continue;
119 if (filter_res != -1) {
120 res->class = 0;
121 res->classid = filter_res;
122 } else {
123 *res = prog->res;
124 }
125
126 ret = tcf_exts_exec(skb, &prog->exts, res);
127 if (ret < 0)
128 continue;
129
130 break;
131 }
132
133 return ret;
134}
135
136static bool cls_bpf_is_ebpf(const struct cls_bpf_prog *prog)
137{
138 return !prog->bpf_ops;
139}
140
141static int cls_bpf_offload_cmd(struct tcf_proto *tp, struct cls_bpf_prog *prog,
142 struct cls_bpf_prog *oldprog,
143 struct netlink_ext_ack *extack)
144{
145 struct tcf_block *block = tp->chain->block;
146 struct tc_cls_bpf_offload cls_bpf = {};
147 struct cls_bpf_prog *obj;
148 bool skip_sw;
149 int err;
150
151 skip_sw = prog && tc_skip_sw(prog->gen_flags);
152 obj = prog ?: oldprog;
153
154 tc_cls_common_offload_init(&cls_bpf.common, tp, obj->gen_flags, extack);
155 cls_bpf.command = TC_CLSBPF_OFFLOAD;
156 cls_bpf.exts = &obj->exts;
157 cls_bpf.prog = prog ? prog->filter : NULL;
158 cls_bpf.oldprog = oldprog ? oldprog->filter : NULL;
159 cls_bpf.name = obj->bpf_name;
160 cls_bpf.exts_integrated = obj->exts_integrated;
161
162 if (oldprog && prog)
163 err = tc_setup_cb_replace(block, tp, TC_SETUP_CLSBPF, &cls_bpf,
164 skip_sw, &oldprog->gen_flags,
165 &oldprog->in_hw_count,
166 &prog->gen_flags, &prog->in_hw_count,
167 true);
168 else if (prog)
169 err = tc_setup_cb_add(block, tp, TC_SETUP_CLSBPF, &cls_bpf,
170 skip_sw, &prog->gen_flags,
171 &prog->in_hw_count, true);
172 else
173 err = tc_setup_cb_destroy(block, tp, TC_SETUP_CLSBPF, &cls_bpf,
174 skip_sw, &oldprog->gen_flags,
175 &oldprog->in_hw_count, true);
176
177 if (prog && err) {
178 cls_bpf_offload_cmd(tp, oldprog, prog, extack);
179 return err;
180 }
181
182 if (prog && skip_sw && !(prog->gen_flags & TCA_CLS_FLAGS_IN_HW))
183 return -EINVAL;
184
185 return 0;
186}
187
188static u32 cls_bpf_flags(u32 flags)
189{
190 return flags & CLS_BPF_SUPPORTED_GEN_FLAGS;
191}
192
193static int cls_bpf_offload(struct tcf_proto *tp, struct cls_bpf_prog *prog,
194 struct cls_bpf_prog *oldprog,
195 struct netlink_ext_ack *extack)
196{
197 if (prog && oldprog &&
198 cls_bpf_flags(prog->gen_flags) !=
199 cls_bpf_flags(oldprog->gen_flags))
200 return -EINVAL;
201
202 if (prog && tc_skip_hw(prog->gen_flags))
203 prog = NULL;
204 if (oldprog && tc_skip_hw(oldprog->gen_flags))
205 oldprog = NULL;
206 if (!prog && !oldprog)
207 return 0;
208
209 return cls_bpf_offload_cmd(tp, prog, oldprog, extack);
210}
211
212static void cls_bpf_stop_offload(struct tcf_proto *tp,
213 struct cls_bpf_prog *prog,
214 struct netlink_ext_ack *extack)
215{
216 int err;
217
218 err = cls_bpf_offload_cmd(tp, NULL, prog, extack);
219 if (err)
220 pr_err("Stopping hardware offload failed: %d\n", err);
221}
222
223static void cls_bpf_offload_update_stats(struct tcf_proto *tp,
224 struct cls_bpf_prog *prog)
225{
226 struct tcf_block *block = tp->chain->block;
227 struct tc_cls_bpf_offload cls_bpf = {};
228
229 tc_cls_common_offload_init(&cls_bpf.common, tp, prog->gen_flags, NULL);
230 cls_bpf.command = TC_CLSBPF_STATS;
231 cls_bpf.exts = &prog->exts;
232 cls_bpf.prog = prog->filter;
233 cls_bpf.name = prog->bpf_name;
234 cls_bpf.exts_integrated = prog->exts_integrated;
235
236 tc_setup_cb_call(block, TC_SETUP_CLSBPF, &cls_bpf, false, true);
237}
238
239static int cls_bpf_init(struct tcf_proto *tp)
240{
241 struct cls_bpf_head *head;
242
243 head = kzalloc(sizeof(*head), GFP_KERNEL);
244 if (head == NULL)
245 return -ENOBUFS;
246
247 INIT_LIST_HEAD_RCU(&head->plist);
248 idr_init(&head->handle_idr);
249 rcu_assign_pointer(tp->root, head);
250
251 return 0;
252}
253
254static void cls_bpf_free_parms(struct cls_bpf_prog *prog)
255{
256 if (cls_bpf_is_ebpf(prog))
257 bpf_prog_put(prog->filter);
258 else
259 bpf_prog_destroy(prog->filter);
260
261 kfree(prog->bpf_name);
262 kfree(prog->bpf_ops);
263}
264
265static void __cls_bpf_delete_prog(struct cls_bpf_prog *prog)
266{
267 tcf_exts_destroy(&prog->exts);
268 tcf_exts_put_net(&prog->exts);
269
270 cls_bpf_free_parms(prog);
271 kfree(prog);
272}
273
274static void cls_bpf_delete_prog_work(struct work_struct *work)
275{
276 struct cls_bpf_prog *prog = container_of(to_rcu_work(work),
277 struct cls_bpf_prog,
278 rwork);
279 rtnl_lock();
280 __cls_bpf_delete_prog(prog);
281 rtnl_unlock();
282}
283
284static void __cls_bpf_delete(struct tcf_proto *tp, struct cls_bpf_prog *prog,
285 struct netlink_ext_ack *extack)
286{
287 struct cls_bpf_head *head = rtnl_dereference(tp->root);
288
289 idr_remove(&head->handle_idr, prog->handle);
290 cls_bpf_stop_offload(tp, prog, extack);
291 list_del_rcu(&prog->link);
292 tcf_unbind_filter(tp, &prog->res);
293 if (tcf_exts_get_net(&prog->exts))
294 tcf_queue_work(&prog->rwork, cls_bpf_delete_prog_work);
295 else
296 __cls_bpf_delete_prog(prog);
297}
298
299static int cls_bpf_delete(struct tcf_proto *tp, void *arg, bool *last,
300 bool rtnl_held, struct netlink_ext_ack *extack)
301{
302 struct cls_bpf_head *head = rtnl_dereference(tp->root);
303
304 __cls_bpf_delete(tp, arg, extack);
305 *last = list_empty(&head->plist);
306 return 0;
307}
308
309static void cls_bpf_destroy(struct tcf_proto *tp, bool rtnl_held,
310 struct netlink_ext_ack *extack)
311{
312 struct cls_bpf_head *head = rtnl_dereference(tp->root);
313 struct cls_bpf_prog *prog, *tmp;
314
315 list_for_each_entry_safe(prog, tmp, &head->plist, link)
316 __cls_bpf_delete(tp, prog, extack);
317
318 idr_destroy(&head->handle_idr);
319 kfree_rcu(head, rcu);
320}
321
322static void *cls_bpf_get(struct tcf_proto *tp, u32 handle)
323{
324 struct cls_bpf_head *head = rtnl_dereference(tp->root);
325 struct cls_bpf_prog *prog;
326
327 list_for_each_entry(prog, &head->plist, link) {
328 if (prog->handle == handle)
329 return prog;
330 }
331
332 return NULL;
333}
334
335static int cls_bpf_prog_from_ops(struct nlattr **tb, struct cls_bpf_prog *prog)
336{
337 struct sock_filter *bpf_ops;
338 struct sock_fprog_kern fprog_tmp;
339 struct bpf_prog *fp;
340 u16 bpf_size, bpf_num_ops;
341 int ret;
342
343 bpf_num_ops = nla_get_u16(tb[TCA_BPF_OPS_LEN]);
344 if (bpf_num_ops > BPF_MAXINSNS || bpf_num_ops == 0)
345 return -EINVAL;
346
347 bpf_size = bpf_num_ops * sizeof(*bpf_ops);
348 if (bpf_size != nla_len(tb[TCA_BPF_OPS]))
349 return -EINVAL;
350
351 bpf_ops = kmemdup(nla_data(tb[TCA_BPF_OPS]), bpf_size, GFP_KERNEL);
352 if (bpf_ops == NULL)
353 return -ENOMEM;
354
355 fprog_tmp.len = bpf_num_ops;
356 fprog_tmp.filter = bpf_ops;
357
358 ret = bpf_prog_create(&fp, &fprog_tmp);
359 if (ret < 0) {
360 kfree(bpf_ops);
361 return ret;
362 }
363
364 prog->bpf_ops = bpf_ops;
365 prog->bpf_num_ops = bpf_num_ops;
366 prog->bpf_name = NULL;
367 prog->filter = fp;
368
369 return 0;
370}
371
372static int cls_bpf_prog_from_efd(struct nlattr **tb, struct cls_bpf_prog *prog,
373 u32 gen_flags, const struct tcf_proto *tp)
374{
375 struct bpf_prog *fp;
376 char *name = NULL;
377 bool skip_sw;
378 u32 bpf_fd;
379
380 bpf_fd = nla_get_u32(tb[TCA_BPF_FD]);
381 skip_sw = gen_flags & TCA_CLS_FLAGS_SKIP_SW;
382
383 fp = bpf_prog_get_type_dev(bpf_fd, BPF_PROG_TYPE_SCHED_CLS, skip_sw);
384 if (IS_ERR(fp))
385 return PTR_ERR(fp);
386
387 if (tb[TCA_BPF_NAME]) {
388 name = nla_memdup(tb[TCA_BPF_NAME], GFP_KERNEL);
389 if (!name) {
390 bpf_prog_put(fp);
391 return -ENOMEM;
392 }
393 }
394
395 prog->bpf_ops = NULL;
396 prog->bpf_name = name;
397 prog->filter = fp;
398
399 if (fp->dst_needed)
400 tcf_block_netif_keep_dst(tp->chain->block);
401
402 return 0;
403}
404
405static int cls_bpf_set_parms(struct net *net, struct tcf_proto *tp,
406 struct cls_bpf_prog *prog, unsigned long base,
407 struct nlattr **tb, struct nlattr *est, bool ovr,
408 struct netlink_ext_ack *extack)
409{
410 bool is_bpf, is_ebpf, have_exts = false;
411 u32 gen_flags = 0;
412 int ret;
413
414 is_bpf = tb[TCA_BPF_OPS_LEN] && tb[TCA_BPF_OPS];
415 is_ebpf = tb[TCA_BPF_FD];
416 if ((!is_bpf && !is_ebpf) || (is_bpf && is_ebpf))
417 return -EINVAL;
418
419 ret = tcf_exts_validate(net, tp, tb, est, &prog->exts, ovr, true,
420 extack);
421 if (ret < 0)
422 return ret;
423
424 if (tb[TCA_BPF_FLAGS]) {
425 u32 bpf_flags = nla_get_u32(tb[TCA_BPF_FLAGS]);
426
427 if (bpf_flags & ~TCA_BPF_FLAG_ACT_DIRECT)
428 return -EINVAL;
429
430 have_exts = bpf_flags & TCA_BPF_FLAG_ACT_DIRECT;
431 }
432 if (tb[TCA_BPF_FLAGS_GEN]) {
433 gen_flags = nla_get_u32(tb[TCA_BPF_FLAGS_GEN]);
434 if (gen_flags & ~CLS_BPF_SUPPORTED_GEN_FLAGS ||
435 !tc_flags_valid(gen_flags))
436 return -EINVAL;
437 }
438
439 prog->exts_integrated = have_exts;
440 prog->gen_flags = gen_flags;
441
442 ret = is_bpf ? cls_bpf_prog_from_ops(tb, prog) :
443 cls_bpf_prog_from_efd(tb, prog, gen_flags, tp);
444 if (ret < 0)
445 return ret;
446
447 if (tb[TCA_BPF_CLASSID]) {
448 prog->res.classid = nla_get_u32(tb[TCA_BPF_CLASSID]);
449 tcf_bind_filter(tp, &prog->res, base);
450 }
451
452 return 0;
453}
454
455static int cls_bpf_change(struct net *net, struct sk_buff *in_skb,
456 struct tcf_proto *tp, unsigned long base,
457 u32 handle, struct nlattr **tca,
458 void **arg, bool ovr, bool rtnl_held,
459 struct netlink_ext_ack *extack)
460{
461 struct cls_bpf_head *head = rtnl_dereference(tp->root);
462 struct cls_bpf_prog *oldprog = *arg;
463 struct nlattr *tb[TCA_BPF_MAX + 1];
464 struct cls_bpf_prog *prog;
465 int ret;
466
467 if (tca[TCA_OPTIONS] == NULL)
468 return -EINVAL;
469
470 ret = nla_parse_nested_deprecated(tb, TCA_BPF_MAX, tca[TCA_OPTIONS],
471 bpf_policy, NULL);
472 if (ret < 0)
473 return ret;
474
475 prog = kzalloc(sizeof(*prog), GFP_KERNEL);
476 if (!prog)
477 return -ENOBUFS;
478
479 ret = tcf_exts_init(&prog->exts, net, TCA_BPF_ACT, TCA_BPF_POLICE);
480 if (ret < 0)
481 goto errout;
482
483 if (oldprog) {
484 if (handle && oldprog->handle != handle) {
485 ret = -EINVAL;
486 goto errout;
487 }
488 }
489
490 if (handle == 0) {
491 handle = 1;
492 ret = idr_alloc_u32(&head->handle_idr, prog, &handle,
493 INT_MAX, GFP_KERNEL);
494 } else if (!oldprog) {
495 ret = idr_alloc_u32(&head->handle_idr, prog, &handle,
496 handle, GFP_KERNEL);
497 }
498
499 if (ret)
500 goto errout;
501 prog->handle = handle;
502
503 ret = cls_bpf_set_parms(net, tp, prog, base, tb, tca[TCA_RATE], ovr,
504 extack);
505 if (ret < 0)
506 goto errout_idr;
507
508 ret = cls_bpf_offload(tp, prog, oldprog, extack);
509 if (ret)
510 goto errout_parms;
511
512 if (!tc_in_hw(prog->gen_flags))
513 prog->gen_flags |= TCA_CLS_FLAGS_NOT_IN_HW;
514
515 if (oldprog) {
516 idr_replace(&head->handle_idr, prog, handle);
517 list_replace_rcu(&oldprog->link, &prog->link);
518 tcf_unbind_filter(tp, &oldprog->res);
519 tcf_exts_get_net(&oldprog->exts);
520 tcf_queue_work(&oldprog->rwork, cls_bpf_delete_prog_work);
521 } else {
522 list_add_rcu(&prog->link, &head->plist);
523 }
524
525 *arg = prog;
526 return 0;
527
528errout_parms:
529 cls_bpf_free_parms(prog);
530errout_idr:
531 if (!oldprog)
532 idr_remove(&head->handle_idr, prog->handle);
533errout:
534 tcf_exts_destroy(&prog->exts);
535 kfree(prog);
536 return ret;
537}
538
539static int cls_bpf_dump_bpf_info(const struct cls_bpf_prog *prog,
540 struct sk_buff *skb)
541{
542 struct nlattr *nla;
543
544 if (nla_put_u16(skb, TCA_BPF_OPS_LEN, prog->bpf_num_ops))
545 return -EMSGSIZE;
546
547 nla = nla_reserve(skb, TCA_BPF_OPS, prog->bpf_num_ops *
548 sizeof(struct sock_filter));
549 if (nla == NULL)
550 return -EMSGSIZE;
551
552 memcpy(nla_data(nla), prog->bpf_ops, nla_len(nla));
553
554 return 0;
555}
556
557static int cls_bpf_dump_ebpf_info(const struct cls_bpf_prog *prog,
558 struct sk_buff *skb)
559{
560 struct nlattr *nla;
561
562 if (prog->bpf_name &&
563 nla_put_string(skb, TCA_BPF_NAME, prog->bpf_name))
564 return -EMSGSIZE;
565
566 if (nla_put_u32(skb, TCA_BPF_ID, prog->filter->aux->id))
567 return -EMSGSIZE;
568
569 nla = nla_reserve(skb, TCA_BPF_TAG, sizeof(prog->filter->tag));
570 if (nla == NULL)
571 return -EMSGSIZE;
572
573 memcpy(nla_data(nla), prog->filter->tag, nla_len(nla));
574
575 return 0;
576}
577
578static int cls_bpf_dump(struct net *net, struct tcf_proto *tp, void *fh,
579 struct sk_buff *skb, struct tcmsg *tm, bool rtnl_held)
580{
581 struct cls_bpf_prog *prog = fh;
582 struct nlattr *nest;
583 u32 bpf_flags = 0;
584 int ret;
585
586 if (prog == NULL)
587 return skb->len;
588
589 tm->tcm_handle = prog->handle;
590
591 cls_bpf_offload_update_stats(tp, prog);
592
593 nest = nla_nest_start_noflag(skb, TCA_OPTIONS);
594 if (nest == NULL)
595 goto nla_put_failure;
596
597 if (prog->res.classid &&
598 nla_put_u32(skb, TCA_BPF_CLASSID, prog->res.classid))
599 goto nla_put_failure;
600
601 if (cls_bpf_is_ebpf(prog))
602 ret = cls_bpf_dump_ebpf_info(prog, skb);
603 else
604 ret = cls_bpf_dump_bpf_info(prog, skb);
605 if (ret)
606 goto nla_put_failure;
607
608 if (tcf_exts_dump(skb, &prog->exts) < 0)
609 goto nla_put_failure;
610
611 if (prog->exts_integrated)
612 bpf_flags |= TCA_BPF_FLAG_ACT_DIRECT;
613 if (bpf_flags && nla_put_u32(skb, TCA_BPF_FLAGS, bpf_flags))
614 goto nla_put_failure;
615 if (prog->gen_flags &&
616 nla_put_u32(skb, TCA_BPF_FLAGS_GEN, prog->gen_flags))
617 goto nla_put_failure;
618
619 nla_nest_end(skb, nest);
620
621 if (tcf_exts_dump_stats(skb, &prog->exts) < 0)
622 goto nla_put_failure;
623
624 return skb->len;
625
626nla_put_failure:
627 nla_nest_cancel(skb, nest);
628 return -1;
629}
630
631static void cls_bpf_bind_class(void *fh, u32 classid, unsigned long cl,
632 void *q, unsigned long base)
633{
634 struct cls_bpf_prog *prog = fh;
635
636 if (prog && prog->res.classid == classid) {
637 if (cl)
638 __tcf_bind_filter(q, &prog->res, base);
639 else
640 __tcf_unbind_filter(q, &prog->res);
641 }
642}
643
644static void cls_bpf_walk(struct tcf_proto *tp, struct tcf_walker *arg,
645 bool rtnl_held)
646{
647 struct cls_bpf_head *head = rtnl_dereference(tp->root);
648 struct cls_bpf_prog *prog;
649
650 list_for_each_entry(prog, &head->plist, link) {
651 if (arg->count < arg->skip)
652 goto skip;
653 if (arg->fn(tp, prog, arg) < 0) {
654 arg->stop = 1;
655 break;
656 }
657skip:
658 arg->count++;
659 }
660}
661
662static int cls_bpf_reoffload(struct tcf_proto *tp, bool add, flow_setup_cb_t *cb,
663 void *cb_priv, struct netlink_ext_ack *extack)
664{
665 struct cls_bpf_head *head = rtnl_dereference(tp->root);
666 struct tcf_block *block = tp->chain->block;
667 struct tc_cls_bpf_offload cls_bpf = {};
668 struct cls_bpf_prog *prog;
669 int err;
670
671 list_for_each_entry(prog, &head->plist, link) {
672 if (tc_skip_hw(prog->gen_flags))
673 continue;
674
675 tc_cls_common_offload_init(&cls_bpf.common, tp, prog->gen_flags,
676 extack);
677 cls_bpf.command = TC_CLSBPF_OFFLOAD;
678 cls_bpf.exts = &prog->exts;
679 cls_bpf.prog = add ? prog->filter : NULL;
680 cls_bpf.oldprog = add ? NULL : prog->filter;
681 cls_bpf.name = prog->bpf_name;
682 cls_bpf.exts_integrated = prog->exts_integrated;
683
684 err = tc_setup_cb_reoffload(block, tp, add, cb, TC_SETUP_CLSBPF,
685 &cls_bpf, cb_priv, &prog->gen_flags,
686 &prog->in_hw_count);
687 if (err)
688 return err;
689 }
690
691 return 0;
692}
693
694static struct tcf_proto_ops cls_bpf_ops __read_mostly = {
695 .kind = "bpf",
696 .owner = THIS_MODULE,
697 .classify = cls_bpf_classify,
698 .init = cls_bpf_init,
699 .destroy = cls_bpf_destroy,
700 .get = cls_bpf_get,
701 .change = cls_bpf_change,
702 .delete = cls_bpf_delete,
703 .walk = cls_bpf_walk,
704 .reoffload = cls_bpf_reoffload,
705 .dump = cls_bpf_dump,
706 .bind_class = cls_bpf_bind_class,
707};
708
709static int __init cls_bpf_init_mod(void)
710{
711 return register_tcf_proto_ops(&cls_bpf_ops);
712}
713
714static void __exit cls_bpf_exit_mod(void)
715{
716 unregister_tcf_proto_ops(&cls_bpf_ops);
717}
718
719module_init(cls_bpf_init_mod);
720module_exit(cls_bpf_exit_mod);