cls_bpf.c

  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#include <net/tc_wrapper.h>
 23
 24MODULE_LICENSE("GPL");
 25MODULE_AUTHOR("Daniel Borkmann <dborkman@redhat.com>");
 26MODULE_DESCRIPTION("TC BPF based classifier");
 27
 28#define CLS_BPF_NAME_LEN	256
 29#define CLS_BPF_SUPPORTED_GEN_FLAGS		\
 30	(TCA_CLS_FLAGS_SKIP_HW | TCA_CLS_FLAGS_SKIP_SW)
 31
 32struct cls_bpf_head {
 33	struct list_head plist;
 34	struct idr handle_idr;
 35	struct rcu_head rcu;
 36};
 37
 38struct cls_bpf_prog {
 39	struct bpf_prog *filter;
 40	struct list_head link;
 41	struct tcf_result res;
 42	bool exts_integrated;
 43	u32 gen_flags;
 44	unsigned int in_hw_count;
 45	struct tcf_exts exts;
 46	u32 handle;
 47	u16 bpf_num_ops;
 48	struct sock_filter *bpf_ops;
 49	const char *bpf_name;
 50	struct tcf_proto *tp;
 51	struct rcu_work rwork;
 52};
 53
 54static const struct nla_policy bpf_policy[TCA_BPF_MAX + 1] = {
 55	[TCA_BPF_CLASSID]	= { .type = NLA_U32 },
 56	[TCA_BPF_FLAGS]		= { .type = NLA_U32 },
 57	[TCA_BPF_FLAGS_GEN]	= { .type = NLA_U32 },
 58	[TCA_BPF_FD]		= { .type = NLA_U32 },
 59	[TCA_BPF_NAME]		= { .type = NLA_NUL_STRING,
 60				    .len = CLS_BPF_NAME_LEN },
 61	[TCA_BPF_OPS_LEN]	= { .type = NLA_U16 },
 62	[TCA_BPF_OPS]		= { .type = NLA_BINARY,
 63				    .len = sizeof(struct sock_filter) * BPF_MAXINSNS },
 64};
 65
 66static int cls_bpf_exec_opcode(int code)
 67{
 68	switch (code) {
 69	case TC_ACT_OK:
 70	case TC_ACT_SHOT:
 71	case TC_ACT_STOLEN:
 72	case TC_ACT_TRAP:
 73	case TC_ACT_REDIRECT:
 74	case TC_ACT_UNSPEC:
 75		return code;
 76	default:
 77		return TC_ACT_UNSPEC;
 78	}
 79}
 80
 81TC_INDIRECT_SCOPE int cls_bpf_classify(struct sk_buff *skb,
 82				       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	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			filter_res = bpf_prog_run_data_pointers(prog->filter, skb);
101			__skb_pull(skb, skb->mac_len);
102		} else {
103			filter_res = bpf_prog_run_data_pointers(prog->filter, skb);
104		}
105		if (unlikely(!skb->tstamp && skb->tstamp_type))
106			skb->tstamp_type = SKB_CLOCK_REALTIME;
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
135	return ret;
136}
137
138static bool cls_bpf_is_ebpf(const struct cls_bpf_prog *prog)
139{
140	return !prog->bpf_ops;
141}
142
143static int cls_bpf_offload_cmd(struct tcf_proto *tp, struct cls_bpf_prog *prog,
144			       struct cls_bpf_prog *oldprog,
145			       struct netlink_ext_ack *extack)
146{
147	struct tcf_block *block = tp->chain->block;
148	struct tc_cls_bpf_offload cls_bpf = {};
149	struct cls_bpf_prog *obj;
150	bool skip_sw;
151	int err;
152
153	skip_sw = prog && tc_skip_sw(prog->gen_flags);
154	obj = prog ?: oldprog;
155
156	tc_cls_common_offload_init(&cls_bpf.common, tp, obj->gen_flags, extack);
157	cls_bpf.command = TC_CLSBPF_OFFLOAD;
158	cls_bpf.exts = &obj->exts;
159	cls_bpf.prog = prog ? prog->filter : NULL;
160	cls_bpf.oldprog = oldprog ? oldprog->filter : NULL;
161	cls_bpf.name = obj->bpf_name;
162	cls_bpf.exts_integrated = obj->exts_integrated;
163
164	if (oldprog && prog)
165		err = tc_setup_cb_replace(block, tp, TC_SETUP_CLSBPF, &cls_bpf,
166					  skip_sw, &oldprog->gen_flags,
167					  &oldprog->in_hw_count,
168					  &prog->gen_flags, &prog->in_hw_count,
169					  true);
170	else if (prog)
171		err = tc_setup_cb_add(block, tp, TC_SETUP_CLSBPF, &cls_bpf,
172				      skip_sw, &prog->gen_flags,
173				      &prog->in_hw_count, true);
174	else
175		err = tc_setup_cb_destroy(block, tp, TC_SETUP_CLSBPF, &cls_bpf,
176					  skip_sw, &oldprog->gen_flags,
177					  &oldprog->in_hw_count, true);
178
179	if (prog && err) {
180		cls_bpf_offload_cmd(tp, oldprog, prog, extack);
181		return err;
182	}
183
184	if (prog && skip_sw && !(prog->gen_flags & TCA_CLS_FLAGS_IN_HW))
185		return -EINVAL;
186
187	return 0;
188}
189
190static u32 cls_bpf_flags(u32 flags)
191{
192	return flags & CLS_BPF_SUPPORTED_GEN_FLAGS;
193}
194
195static 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
214static 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
225static 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, TC_SETUP_CLSBPF, &cls_bpf, false, true);
239}
240
241static 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
256static 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
267static 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
276static void cls_bpf_delete_prog_work(struct work_struct *work)
277{
278	struct cls_bpf_prog *prog = container_of(to_rcu_work(work),
279						 struct cls_bpf_prog,
280						 rwork);
281	rtnl_lock();
282	__cls_bpf_delete_prog(prog);
283	rtnl_unlock();
284}
285
286static void __cls_bpf_delete(struct tcf_proto *tp, struct cls_bpf_prog *prog,
287			     struct netlink_ext_ack *extack)
288{
289	struct cls_bpf_head *head = rtnl_dereference(tp->root);
290
291	idr_remove(&head->handle_idr, prog->handle);
292	cls_bpf_stop_offload(tp, prog, extack);
293	list_del_rcu(&prog->link);
294	tcf_unbind_filter(tp, &prog->res);
295	if (tcf_exts_get_net(&prog->exts))
296		tcf_queue_work(&prog->rwork, cls_bpf_delete_prog_work);
297	else
298		__cls_bpf_delete_prog(prog);
299}
300
301static int cls_bpf_delete(struct tcf_proto *tp, void *arg, bool *last,
302			  bool rtnl_held, struct netlink_ext_ack *extack)
303{
304	struct cls_bpf_head *head = rtnl_dereference(tp->root);
305
306	__cls_bpf_delete(tp, arg, extack);
307	*last = list_empty(&head->plist);
308	return 0;
309}
310
311static void cls_bpf_destroy(struct tcf_proto *tp, bool rtnl_held,
312			    struct netlink_ext_ack *extack)
313{
314	struct cls_bpf_head *head = rtnl_dereference(tp->root);
315	struct cls_bpf_prog *prog, *tmp;
316
317	list_for_each_entry_safe(prog, tmp, &head->plist, link)
318		__cls_bpf_delete(tp, prog, extack);
319
320	idr_destroy(&head->handle_idr);
321	kfree_rcu(head, rcu);
322}
323
324static void *cls_bpf_get(struct tcf_proto *tp, u32 handle)
325{
326	struct cls_bpf_head *head = rtnl_dereference(tp->root);
327	struct cls_bpf_prog *prog;
328
329	list_for_each_entry(prog, &head->plist, link) {
330		if (prog->handle == handle)
331			return prog;
332	}
333
334	return NULL;
335}
336
337static int cls_bpf_prog_from_ops(struct nlattr **tb, struct cls_bpf_prog *prog)
338{
339	struct sock_filter *bpf_ops;
340	struct sock_fprog_kern fprog_tmp;
341	struct bpf_prog *fp;
342	u16 bpf_size, bpf_num_ops;
343	int ret;
344
345	bpf_num_ops = nla_get_u16(tb[TCA_BPF_OPS_LEN]);
346	if (bpf_num_ops > BPF_MAXINSNS || bpf_num_ops == 0)
347		return -EINVAL;
348
349	bpf_size = bpf_num_ops * sizeof(*bpf_ops);
350	if (bpf_size != nla_len(tb[TCA_BPF_OPS]))
351		return -EINVAL;
352
353	bpf_ops = kmemdup(nla_data(tb[TCA_BPF_OPS]), bpf_size, GFP_KERNEL);
354	if (bpf_ops == NULL)
355		return -ENOMEM;
356
357	fprog_tmp.len = bpf_num_ops;
358	fprog_tmp.filter = bpf_ops;
359
360	ret = bpf_prog_create(&fp, &fprog_tmp);
361	if (ret < 0) {
362		kfree(bpf_ops);
363		return ret;
364	}
365
366	prog->bpf_ops = bpf_ops;
367	prog->bpf_num_ops = bpf_num_ops;
368	prog->bpf_name = NULL;
369	prog->filter = fp;
370
371	return 0;
372}
373
374static int cls_bpf_prog_from_efd(struct nlattr **tb, struct cls_bpf_prog *prog,
375				 u32 gen_flags, const struct tcf_proto *tp)
376{
377	struct bpf_prog *fp;
378	char *name = NULL;
379	bool skip_sw;
380	u32 bpf_fd;
381
382	bpf_fd = nla_get_u32(tb[TCA_BPF_FD]);
383	skip_sw = gen_flags & TCA_CLS_FLAGS_SKIP_SW;
384
385	fp = bpf_prog_get_type_dev(bpf_fd, BPF_PROG_TYPE_SCHED_CLS, skip_sw);
386	if (IS_ERR(fp))
387		return PTR_ERR(fp);
388
389	if (tb[TCA_BPF_NAME]) {
390		name = nla_memdup(tb[TCA_BPF_NAME], GFP_KERNEL);
391		if (!name) {
392			bpf_prog_put(fp);
393			return -ENOMEM;
394		}
395	}
396
397	prog->bpf_ops = NULL;
398	prog->bpf_name = name;
399	prog->filter = fp;
400
401	if (fp->dst_needed)
402		tcf_block_netif_keep_dst(tp->chain->block);
403
404	return 0;
405}
406
407static int cls_bpf_change(struct net *net, struct sk_buff *in_skb,
408			  struct tcf_proto *tp, unsigned long base,
409			  u32 handle, struct nlattr **tca,
410			  void **arg, u32 flags,
411			  struct netlink_ext_ack *extack)
412{
413	struct cls_bpf_head *head = rtnl_dereference(tp->root);
414	bool is_bpf, is_ebpf, have_exts = false;
415	struct cls_bpf_prog *oldprog = *arg;
416	struct nlattr *tb[TCA_BPF_MAX + 1];
417	bool bound_to_filter = false;
418	struct cls_bpf_prog *prog;
419	u32 gen_flags = 0;
420	int ret;
421
422	if (tca[TCA_OPTIONS] == NULL)
423		return -EINVAL;
424
425	ret = nla_parse_nested_deprecated(tb, TCA_BPF_MAX, tca[TCA_OPTIONS],
426					  bpf_policy, NULL);
427	if (ret < 0)
428		return ret;
429
430	prog = kzalloc(sizeof(*prog), GFP_KERNEL);
431	if (!prog)
432		return -ENOBUFS;
433
434	ret = tcf_exts_init(&prog->exts, net, TCA_BPF_ACT, TCA_BPF_POLICE);
435	if (ret < 0)
436		goto errout;
437
438	if (oldprog) {
439		if (handle && oldprog->handle != handle) {
440			ret = -EINVAL;
441			goto errout;
442		}
443	}
444
445	if (handle == 0) {
446		handle = 1;
447		ret = idr_alloc_u32(&head->handle_idr, prog, &handle,
448				    INT_MAX, GFP_KERNEL);
449	} else if (!oldprog) {
450		ret = idr_alloc_u32(&head->handle_idr, prog, &handle,
451				    handle, GFP_KERNEL);
452	}
453
454	if (ret)
455		goto errout;
456	prog->handle = handle;
457
458	is_bpf = tb[TCA_BPF_OPS_LEN] && tb[TCA_BPF_OPS];
459	is_ebpf = tb[TCA_BPF_FD];
460	if ((!is_bpf && !is_ebpf) || (is_bpf && is_ebpf)) {
461		ret = -EINVAL;
462		goto errout_idr;
463	}
464
465	ret = tcf_exts_validate(net, tp, tb, tca[TCA_RATE], &prog->exts,
466				flags, extack);
467	if (ret < 0)
468		goto errout_idr;
469
470	if (tb[TCA_BPF_FLAGS]) {
471		u32 bpf_flags = nla_get_u32(tb[TCA_BPF_FLAGS]);
472
473		if (bpf_flags & ~TCA_BPF_FLAG_ACT_DIRECT) {
474			ret = -EINVAL;
475			goto errout_idr;
476		}
477
478		have_exts = bpf_flags & TCA_BPF_FLAG_ACT_DIRECT;
479	}
480	if (tb[TCA_BPF_FLAGS_GEN]) {
481		gen_flags = nla_get_u32(tb[TCA_BPF_FLAGS_GEN]);
482		if (gen_flags & ~CLS_BPF_SUPPORTED_GEN_FLAGS ||
483		    !tc_flags_valid(gen_flags)) {
484			ret = -EINVAL;
485			goto errout_idr;
486		}
487	}
488
489	prog->exts_integrated = have_exts;
490	prog->gen_flags = gen_flags;
491
492	ret = is_bpf ? cls_bpf_prog_from_ops(tb, prog) :
493		cls_bpf_prog_from_efd(tb, prog, gen_flags, tp);
494	if (ret < 0)
495		goto errout_idr;
496
497	if (tb[TCA_BPF_CLASSID]) {
498		prog->res.classid = nla_get_u32(tb[TCA_BPF_CLASSID]);
499		tcf_bind_filter(tp, &prog->res, base);
500		bound_to_filter = true;
501	}
502
503	ret = cls_bpf_offload(tp, prog, oldprog, extack);
504	if (ret)
505		goto errout_parms;
506
507	if (!tc_in_hw(prog->gen_flags))
508		prog->gen_flags |= TCA_CLS_FLAGS_NOT_IN_HW;
509
510	tcf_proto_update_usesw(tp, prog->gen_flags);
511
512	if (oldprog) {
513		idr_replace(&head->handle_idr, prog, handle);
514		list_replace_rcu(&oldprog->link, &prog->link);
515		tcf_unbind_filter(tp, &oldprog->res);
516		tcf_exts_get_net(&oldprog->exts);
517		tcf_queue_work(&oldprog->rwork, cls_bpf_delete_prog_work);
518	} else {
519		list_add_rcu(&prog->link, &head->plist);
520	}
521
522	*arg = prog;
523	return 0;
524
525errout_parms:
526	if (bound_to_filter)
527		tcf_unbind_filter(tp, &prog->res);
528	cls_bpf_free_parms(prog);
529errout_idr:
530	if (!oldprog)
531		idr_remove(&head->handle_idr, prog->handle);
532errout:
533	tcf_exts_destroy(&prog->exts);
534	kfree(prog);
535	return ret;
536}
537
538static int cls_bpf_dump_bpf_info(const struct cls_bpf_prog *prog,
539				 struct sk_buff *skb)
540{
541	struct nlattr *nla;
542
543	if (nla_put_u16(skb, TCA_BPF_OPS_LEN, prog->bpf_num_ops))
544		return -EMSGSIZE;
545
546	nla = nla_reserve(skb, TCA_BPF_OPS, prog->bpf_num_ops *
547			  sizeof(struct sock_filter));
548	if (nla == NULL)
549		return -EMSGSIZE;
550
551	memcpy(nla_data(nla), prog->bpf_ops, nla_len(nla));
552
553	return 0;
554}
555
556static int cls_bpf_dump_ebpf_info(const struct cls_bpf_prog *prog,
557				  struct sk_buff *skb)
558{
559	struct nlattr *nla;
560
561	if (prog->bpf_name &&
562	    nla_put_string(skb, TCA_BPF_NAME, prog->bpf_name))
563		return -EMSGSIZE;
564
565	if (nla_put_u32(skb, TCA_BPF_ID, prog->filter->aux->id))
566		return -EMSGSIZE;
567
568	nla = nla_reserve(skb, TCA_BPF_TAG, sizeof(prog->filter->tag));
569	if (nla == NULL)
570		return -EMSGSIZE;
571
572	memcpy(nla_data(nla), prog->filter->tag, nla_len(nla));
573
574	return 0;
575}
576
577static int cls_bpf_dump(struct net *net, struct tcf_proto *tp, void *fh,
578			struct sk_buff *skb, struct tcmsg *tm, bool rtnl_held)
579{
580	struct cls_bpf_prog *prog = fh;
581	struct nlattr *nest;
582	u32 bpf_flags = 0;
583	int ret;
584
585	if (prog == NULL)
586		return skb->len;
587
588	tm->tcm_handle = prog->handle;
589
590	cls_bpf_offload_update_stats(tp, prog);
591
592	nest = nla_nest_start_noflag(skb, TCA_OPTIONS);
593	if (nest == NULL)
594		goto nla_put_failure;
595
596	if (prog->res.classid &&
597	    nla_put_u32(skb, TCA_BPF_CLASSID, prog->res.classid))
598		goto nla_put_failure;
599
600	if (cls_bpf_is_ebpf(prog))
601		ret = cls_bpf_dump_ebpf_info(prog, skb);
602	else
603		ret = cls_bpf_dump_bpf_info(prog, skb);
604	if (ret)
605		goto nla_put_failure;
606
607	if (tcf_exts_dump(skb, &prog->exts) < 0)
608		goto nla_put_failure;
609
610	if (prog->exts_integrated)
611		bpf_flags |= TCA_BPF_FLAG_ACT_DIRECT;
612	if (bpf_flags && nla_put_u32(skb, TCA_BPF_FLAGS, bpf_flags))
613		goto nla_put_failure;
614	if (prog->gen_flags &&
615	    nla_put_u32(skb, TCA_BPF_FLAGS_GEN, prog->gen_flags))
616		goto nla_put_failure;
617
618	nla_nest_end(skb, nest);
619
620	if (tcf_exts_dump_stats(skb, &prog->exts) < 0)
621		goto nla_put_failure;
622
623	return skb->len;
624
625nla_put_failure:
626	nla_nest_cancel(skb, nest);
627	return -1;
628}
629
630static void cls_bpf_bind_class(void *fh, u32 classid, unsigned long cl,
631			       void *q, unsigned long base)
632{
633	struct cls_bpf_prog *prog = fh;
634
635	tc_cls_bind_class(classid, cl, q, &prog->res, base);
636}
637
638static void cls_bpf_walk(struct tcf_proto *tp, struct tcf_walker *arg,
639			 bool rtnl_held)
640{
641	struct cls_bpf_head *head = rtnl_dereference(tp->root);
642	struct cls_bpf_prog *prog;
643
644	list_for_each_entry(prog, &head->plist, link) {
645		if (!tc_cls_stats_dump(tp, arg, prog))
646			break;
647	}
648}
649
650static int cls_bpf_reoffload(struct tcf_proto *tp, bool add, flow_setup_cb_t *cb,
651			     void *cb_priv, struct netlink_ext_ack *extack)
652{
653	struct cls_bpf_head *head = rtnl_dereference(tp->root);
654	struct tcf_block *block = tp->chain->block;
655	struct tc_cls_bpf_offload cls_bpf = {};
656	struct cls_bpf_prog *prog;
657	int err;
658
659	list_for_each_entry(prog, &head->plist, link) {
660		if (tc_skip_hw(prog->gen_flags))
661			continue;
662
663		tc_cls_common_offload_init(&cls_bpf.common, tp, prog->gen_flags,
664					   extack);
665		cls_bpf.command = TC_CLSBPF_OFFLOAD;
666		cls_bpf.exts = &prog->exts;
667		cls_bpf.prog = add ? prog->filter : NULL;
668		cls_bpf.oldprog = add ? NULL : prog->filter;
669		cls_bpf.name = prog->bpf_name;
670		cls_bpf.exts_integrated = prog->exts_integrated;
671
672		err = tc_setup_cb_reoffload(block, tp, add, cb, TC_SETUP_CLSBPF,
673					    &cls_bpf, cb_priv, &prog->gen_flags,
674					    &prog->in_hw_count);
675		if (err)
676			return err;
677	}
678
679	return 0;
680}
681
682static struct tcf_proto_ops cls_bpf_ops __read_mostly = {
683	.kind		=	"bpf",
684	.owner		=	THIS_MODULE,
685	.classify	=	cls_bpf_classify,
686	.init		=	cls_bpf_init,
687	.destroy	=	cls_bpf_destroy,
688	.get		=	cls_bpf_get,
689	.change		=	cls_bpf_change,
690	.delete		=	cls_bpf_delete,
691	.walk		=	cls_bpf_walk,
692	.reoffload	=	cls_bpf_reoffload,
693	.dump		=	cls_bpf_dump,
694	.bind_class	=	cls_bpf_bind_class,
695};
696MODULE_ALIAS_NET_CLS("bpf");
697
698static int __init cls_bpf_init_mod(void)
699{
700	return register_tcf_proto_ops(&cls_bpf_ops);
701}
702
703static void __exit cls_bpf_exit_mod(void)
704{
705	unregister_tcf_proto_ops(&cls_bpf_ops);
706}
707
708module_init(cls_bpf_init_mod);
709module_exit(cls_bpf_exit_mod);