xref: /openbmc/linux/net/sched/cls_flow.c (revision 31b90347) 
1 /*
2  * net/sched/cls_flow.c		Generic flow classifier
3  *
4  * Copyright (c) 2007, 2008 Patrick McHardy <kaber@trash.net>
5  *
6  * This program is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU General Public License
8  * as published by the Free Software Foundation; either version 2
9  * of the License, or (at your option) any later version.
10  */
11 
12 #include <linux/kernel.h>
13 #include <linux/init.h>
14 #include <linux/list.h>
15 #include <linux/jhash.h>
16 #include <linux/random.h>
17 #include <linux/pkt_cls.h>
18 #include <linux/skbuff.h>
19 #include <linux/in.h>
20 #include <linux/ip.h>
21 #include <linux/ipv6.h>
22 #include <linux/if_vlan.h>
23 #include <linux/slab.h>
24 #include <linux/module.h>
25 
26 #include <net/pkt_cls.h>
27 #include <net/ip.h>
28 #include <net/route.h>
29 #include <net/flow_keys.h>
30 
31 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
32 #include <net/netfilter/nf_conntrack.h>
33 #endif
34 
35 struct flow_head {
36 	struct list_head	filters;
37 };
38 
39 struct flow_filter {
40 	struct list_head	list;
41 	struct tcf_exts		exts;
42 	struct tcf_ematch_tree	ematches;
43 	struct timer_list	perturb_timer;
44 	u32			perturb_period;
45 	u32			handle;
46 
47 	u32			nkeys;
48 	u32			keymask;
49 	u32			mode;
50 	u32			mask;
51 	u32			xor;
52 	u32			rshift;
53 	u32			addend;
54 	u32			divisor;
55 	u32			baseclass;
56 	u32			hashrnd;
57 };
58 
59 static const struct tcf_ext_map flow_ext_map = {
60 	.action	= TCA_FLOW_ACT,
61 	.police	= TCA_FLOW_POLICE,
62 };
63 
64 static inline u32 addr_fold(void *addr)
65 {
66 	unsigned long a = (unsigned long)addr;
67 
68 	return (a & 0xFFFFFFFF) ^ (BITS_PER_LONG > 32 ? a >> 32 : 0);
69 }
70 
71 static u32 flow_get_src(const struct sk_buff *skb, const struct flow_keys *flow)
72 {
73 	if (flow->src)
74 		return ntohl(flow->src);
75 	return addr_fold(skb->sk);
76 }
77 
78 static u32 flow_get_dst(const struct sk_buff *skb, const struct flow_keys *flow)
79 {
80 	if (flow->dst)
81 		return ntohl(flow->dst);
82 	return addr_fold(skb_dst(skb)) ^ (__force u16)skb->protocol;
83 }
84 
85 static u32 flow_get_proto(const struct sk_buff *skb, const struct flow_keys *flow)
86 {
87 	return flow->ip_proto;
88 }
89 
90 static u32 flow_get_proto_src(const struct sk_buff *skb, const struct flow_keys *flow)
91 {
92 	if (flow->ports)
93 		return ntohs(flow->port16[0]);
94 
95 	return addr_fold(skb->sk);
96 }
97 
98 static u32 flow_get_proto_dst(const struct sk_buff *skb, const struct flow_keys *flow)
99 {
100 	if (flow->ports)
101 		return ntohs(flow->port16[1]);
102 
103 	return addr_fold(skb_dst(skb)) ^ (__force u16)skb->protocol;
104 }
105 
106 static u32 flow_get_iif(const struct sk_buff *skb)
107 {
108 	return skb->skb_iif;
109 }
110 
111 static u32 flow_get_priority(const struct sk_buff *skb)
112 {
113 	return skb->priority;
114 }
115 
116 static u32 flow_get_mark(const struct sk_buff *skb)
117 {
118 	return skb->mark;
119 }
120 
121 static u32 flow_get_nfct(const struct sk_buff *skb)
122 {
123 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
124 	return addr_fold(skb->nfct);
125 #else
126 	return 0;
127 #endif
128 }
129 
130 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
131 #define CTTUPLE(skb, member)						\
132 ({									\
133 	enum ip_conntrack_info ctinfo;					\
134 	const struct nf_conn *ct = nf_ct_get(skb, &ctinfo);		\
135 	if (ct == NULL)							\
136 		goto fallback;						\
137 	ct->tuplehash[CTINFO2DIR(ctinfo)].tuple.member;			\
138 })
139 #else
140 #define CTTUPLE(skb, member)						\
141 ({									\
142 	goto fallback;							\
143 	0;								\
144 })
145 #endif
146 
147 static u32 flow_get_nfct_src(const struct sk_buff *skb, const struct flow_keys *flow)
148 {
149 	switch (skb->protocol) {
150 	case htons(ETH_P_IP):
151 		return ntohl(CTTUPLE(skb, src.u3.ip));
152 	case htons(ETH_P_IPV6):
153 		return ntohl(CTTUPLE(skb, src.u3.ip6[3]));
154 	}
155 fallback:
156 	return flow_get_src(skb, flow);
157 }
158 
159 static u32 flow_get_nfct_dst(const struct sk_buff *skb, const struct flow_keys *flow)
160 {
161 	switch (skb->protocol) {
162 	case htons(ETH_P_IP):
163 		return ntohl(CTTUPLE(skb, dst.u3.ip));
164 	case htons(ETH_P_IPV6):
165 		return ntohl(CTTUPLE(skb, dst.u3.ip6[3]));
166 	}
167 fallback:
168 	return flow_get_dst(skb, flow);
169 }
170 
171 static u32 flow_get_nfct_proto_src(const struct sk_buff *skb, const struct flow_keys *flow)
172 {
173 	return ntohs(CTTUPLE(skb, src.u.all));
174 fallback:
175 	return flow_get_proto_src(skb, flow);
176 }
177 
178 static u32 flow_get_nfct_proto_dst(const struct sk_buff *skb, const struct flow_keys *flow)
179 {
180 	return ntohs(CTTUPLE(skb, dst.u.all));
181 fallback:
182 	return flow_get_proto_dst(skb, flow);
183 }
184 
185 static u32 flow_get_rtclassid(const struct sk_buff *skb)
186 {
187 #ifdef CONFIG_IP_ROUTE_CLASSID
188 	if (skb_dst(skb))
189 		return skb_dst(skb)->tclassid;
190 #endif
191 	return 0;
192 }
193 
194 static u32 flow_get_skuid(const struct sk_buff *skb)
195 {
196 	if (skb->sk && skb->sk->sk_socket && skb->sk->sk_socket->file) {
197 		kuid_t skuid = skb->sk->sk_socket->file->f_cred->fsuid;
198 		return from_kuid(&init_user_ns, skuid);
199 	}
200 	return 0;
201 }
202 
203 static u32 flow_get_skgid(const struct sk_buff *skb)
204 {
205 	if (skb->sk && skb->sk->sk_socket && skb->sk->sk_socket->file) {
206 		kgid_t skgid = skb->sk->sk_socket->file->f_cred->fsgid;
207 		return from_kgid(&init_user_ns, skgid);
208 	}
209 	return 0;
210 }
211 
212 static u32 flow_get_vlan_tag(const struct sk_buff *skb)
213 {
214 	u16 uninitialized_var(tag);
215 
216 	if (vlan_get_tag(skb, &tag) < 0)
217 		return 0;
218 	return tag & VLAN_VID_MASK;
219 }
220 
221 static u32 flow_get_rxhash(struct sk_buff *skb)
222 {
223 	return skb_get_rxhash(skb);
224 }
225 
226 static u32 flow_key_get(struct sk_buff *skb, int key, struct flow_keys *flow)
227 {
228 	switch (key) {
229 	case FLOW_KEY_SRC:
230 		return flow_get_src(skb, flow);
231 	case FLOW_KEY_DST:
232 		return flow_get_dst(skb, flow);
233 	case FLOW_KEY_PROTO:
234 		return flow_get_proto(skb, flow);
235 	case FLOW_KEY_PROTO_SRC:
236 		return flow_get_proto_src(skb, flow);
237 	case FLOW_KEY_PROTO_DST:
238 		return flow_get_proto_dst(skb, flow);
239 	case FLOW_KEY_IIF:
240 		return flow_get_iif(skb);
241 	case FLOW_KEY_PRIORITY:
242 		return flow_get_priority(skb);
243 	case FLOW_KEY_MARK:
244 		return flow_get_mark(skb);
245 	case FLOW_KEY_NFCT:
246 		return flow_get_nfct(skb);
247 	case FLOW_KEY_NFCT_SRC:
248 		return flow_get_nfct_src(skb, flow);
249 	case FLOW_KEY_NFCT_DST:
250 		return flow_get_nfct_dst(skb, flow);
251 	case FLOW_KEY_NFCT_PROTO_SRC:
252 		return flow_get_nfct_proto_src(skb, flow);
253 	case FLOW_KEY_NFCT_PROTO_DST:
254 		return flow_get_nfct_proto_dst(skb, flow);
255 	case FLOW_KEY_RTCLASSID:
256 		return flow_get_rtclassid(skb);
257 	case FLOW_KEY_SKUID:
258 		return flow_get_skuid(skb);
259 	case FLOW_KEY_SKGID:
260 		return flow_get_skgid(skb);
261 	case FLOW_KEY_VLAN_TAG:
262 		return flow_get_vlan_tag(skb);
263 	case FLOW_KEY_RXHASH:
264 		return flow_get_rxhash(skb);
265 	default:
266 		WARN_ON(1);
267 		return 0;
268 	}
269 }
270 
271 #define FLOW_KEYS_NEEDED ((1 << FLOW_KEY_SRC) | 		\
272 			  (1 << FLOW_KEY_DST) |			\
273 			  (1 << FLOW_KEY_PROTO) |		\
274 			  (1 << FLOW_KEY_PROTO_SRC) |		\
275 			  (1 << FLOW_KEY_PROTO_DST) | 		\
276 			  (1 << FLOW_KEY_NFCT_SRC) |		\
277 			  (1 << FLOW_KEY_NFCT_DST) |		\
278 			  (1 << FLOW_KEY_NFCT_PROTO_SRC) |	\
279 			  (1 << FLOW_KEY_NFCT_PROTO_DST))
280 
281 static int flow_classify(struct sk_buff *skb, const struct tcf_proto *tp,
282 			 struct tcf_result *res)
283 {
284 	struct flow_head *head = tp->root;
285 	struct flow_filter *f;
286 	u32 keymask;
287 	u32 classid;
288 	unsigned int n, key;
289 	int r;
290 
291 	list_for_each_entry(f, &head->filters, list) {
292 		u32 keys[FLOW_KEY_MAX + 1];
293 		struct flow_keys flow_keys;
294 
295 		if (!tcf_em_tree_match(skb, &f->ematches, NULL))
296 			continue;
297 
298 		keymask = f->keymask;
299 		if (keymask & FLOW_KEYS_NEEDED)
300 			skb_flow_dissect(skb, &flow_keys);
301 
302 		for (n = 0; n < f->nkeys; n++) {
303 			key = ffs(keymask) - 1;
304 			keymask &= ~(1 << key);
305 			keys[n] = flow_key_get(skb, key, &flow_keys);
306 		}
307 
308 		if (f->mode == FLOW_MODE_HASH)
309 			classid = jhash2(keys, f->nkeys, f->hashrnd);
310 		else {
311 			classid = keys[0];
312 			classid = (classid & f->mask) ^ f->xor;
313 			classid = (classid >> f->rshift) + f->addend;
314 		}
315 
316 		if (f->divisor)
317 			classid %= f->divisor;
318 
319 		res->class   = 0;
320 		res->classid = TC_H_MAKE(f->baseclass, f->baseclass + classid);
321 
322 		r = tcf_exts_exec(skb, &f->exts, res);
323 		if (r < 0)
324 			continue;
325 		return r;
326 	}
327 	return -1;
328 }
329 
330 static void flow_perturbation(unsigned long arg)
331 {
332 	struct flow_filter *f = (struct flow_filter *)arg;
333 
334 	get_random_bytes(&f->hashrnd, 4);
335 	if (f->perturb_period)
336 		mod_timer(&f->perturb_timer, jiffies + f->perturb_period);
337 }
338 
339 static const struct nla_policy flow_policy[TCA_FLOW_MAX + 1] = {
340 	[TCA_FLOW_KEYS]		= { .type = NLA_U32 },
341 	[TCA_FLOW_MODE]		= { .type = NLA_U32 },
342 	[TCA_FLOW_BASECLASS]	= { .type = NLA_U32 },
343 	[TCA_FLOW_RSHIFT]	= { .type = NLA_U32 },
344 	[TCA_FLOW_ADDEND]	= { .type = NLA_U32 },
345 	[TCA_FLOW_MASK]		= { .type = NLA_U32 },
346 	[TCA_FLOW_XOR]		= { .type = NLA_U32 },
347 	[TCA_FLOW_DIVISOR]	= { .type = NLA_U32 },
348 	[TCA_FLOW_ACT]		= { .type = NLA_NESTED },
349 	[TCA_FLOW_POLICE]	= { .type = NLA_NESTED },
350 	[TCA_FLOW_EMATCHES]	= { .type = NLA_NESTED },
351 	[TCA_FLOW_PERTURB]	= { .type = NLA_U32 },
352 };
353 
354 static int flow_change(struct net *net, struct sk_buff *in_skb,
355 		       struct tcf_proto *tp, unsigned long base,
356 		       u32 handle, struct nlattr **tca,
357 		       unsigned long *arg)
358 {
359 	struct flow_head *head = tp->root;
360 	struct flow_filter *f;
361 	struct nlattr *opt = tca[TCA_OPTIONS];
362 	struct nlattr *tb[TCA_FLOW_MAX + 1];
363 	struct tcf_exts e;
364 	struct tcf_ematch_tree t;
365 	unsigned int nkeys = 0;
366 	unsigned int perturb_period = 0;
367 	u32 baseclass = 0;
368 	u32 keymask = 0;
369 	u32 mode;
370 	int err;
371 
372 	if (opt == NULL)
373 		return -EINVAL;
374 
375 	err = nla_parse_nested(tb, TCA_FLOW_MAX, opt, flow_policy);
376 	if (err < 0)
377 		return err;
378 
379 	if (tb[TCA_FLOW_BASECLASS]) {
380 		baseclass = nla_get_u32(tb[TCA_FLOW_BASECLASS]);
381 		if (TC_H_MIN(baseclass) == 0)
382 			return -EINVAL;
383 	}
384 
385 	if (tb[TCA_FLOW_KEYS]) {
386 		keymask = nla_get_u32(tb[TCA_FLOW_KEYS]);
387 
388 		nkeys = hweight32(keymask);
389 		if (nkeys == 0)
390 			return -EINVAL;
391 
392 		if (fls(keymask) - 1 > FLOW_KEY_MAX)
393 			return -EOPNOTSUPP;
394 
395 		if ((keymask & (FLOW_KEY_SKUID|FLOW_KEY_SKGID)) &&
396 		    sk_user_ns(NETLINK_CB(in_skb).sk) != &init_user_ns)
397 			return -EOPNOTSUPP;
398 	}
399 
400 	err = tcf_exts_validate(net, tp, tb, tca[TCA_RATE], &e, &flow_ext_map);
401 	if (err < 0)
402 		return err;
403 
404 	err = tcf_em_tree_validate(tp, tb[TCA_FLOW_EMATCHES], &t);
405 	if (err < 0)
406 		goto err1;
407 
408 	f = (struct flow_filter *)*arg;
409 	if (f != NULL) {
410 		err = -EINVAL;
411 		if (f->handle != handle && handle)
412 			goto err2;
413 
414 		mode = f->mode;
415 		if (tb[TCA_FLOW_MODE])
416 			mode = nla_get_u32(tb[TCA_FLOW_MODE]);
417 		if (mode != FLOW_MODE_HASH && nkeys > 1)
418 			goto err2;
419 
420 		if (mode == FLOW_MODE_HASH)
421 			perturb_period = f->perturb_period;
422 		if (tb[TCA_FLOW_PERTURB]) {
423 			if (mode != FLOW_MODE_HASH)
424 				goto err2;
425 			perturb_period = nla_get_u32(tb[TCA_FLOW_PERTURB]) * HZ;
426 		}
427 	} else {
428 		err = -EINVAL;
429 		if (!handle)
430 			goto err2;
431 		if (!tb[TCA_FLOW_KEYS])
432 			goto err2;
433 
434 		mode = FLOW_MODE_MAP;
435 		if (tb[TCA_FLOW_MODE])
436 			mode = nla_get_u32(tb[TCA_FLOW_MODE]);
437 		if (mode != FLOW_MODE_HASH && nkeys > 1)
438 			goto err2;
439 
440 		if (tb[TCA_FLOW_PERTURB]) {
441 			if (mode != FLOW_MODE_HASH)
442 				goto err2;
443 			perturb_period = nla_get_u32(tb[TCA_FLOW_PERTURB]) * HZ;
444 		}
445 
446 		if (TC_H_MAJ(baseclass) == 0)
447 			baseclass = TC_H_MAKE(tp->q->handle, baseclass);
448 		if (TC_H_MIN(baseclass) == 0)
449 			baseclass = TC_H_MAKE(baseclass, 1);
450 
451 		err = -ENOBUFS;
452 		f = kzalloc(sizeof(*f), GFP_KERNEL);
453 		if (f == NULL)
454 			goto err2;
455 
456 		f->handle = handle;
457 		f->mask	  = ~0U;
458 
459 		get_random_bytes(&f->hashrnd, 4);
460 		f->perturb_timer.function = flow_perturbation;
461 		f->perturb_timer.data = (unsigned long)f;
462 		init_timer_deferrable(&f->perturb_timer);
463 	}
464 
465 	tcf_exts_change(tp, &f->exts, &e);
466 	tcf_em_tree_change(tp, &f->ematches, &t);
467 
468 	tcf_tree_lock(tp);
469 
470 	if (tb[TCA_FLOW_KEYS]) {
471 		f->keymask = keymask;
472 		f->nkeys   = nkeys;
473 	}
474 
475 	f->mode = mode;
476 
477 	if (tb[TCA_FLOW_MASK])
478 		f->mask = nla_get_u32(tb[TCA_FLOW_MASK]);
479 	if (tb[TCA_FLOW_XOR])
480 		f->xor = nla_get_u32(tb[TCA_FLOW_XOR]);
481 	if (tb[TCA_FLOW_RSHIFT])
482 		f->rshift = nla_get_u32(tb[TCA_FLOW_RSHIFT]);
483 	if (tb[TCA_FLOW_ADDEND])
484 		f->addend = nla_get_u32(tb[TCA_FLOW_ADDEND]);
485 
486 	if (tb[TCA_FLOW_DIVISOR])
487 		f->divisor = nla_get_u32(tb[TCA_FLOW_DIVISOR]);
488 	if (baseclass)
489 		f->baseclass = baseclass;
490 
491 	f->perturb_period = perturb_period;
492 	del_timer(&f->perturb_timer);
493 	if (perturb_period)
494 		mod_timer(&f->perturb_timer, jiffies + perturb_period);
495 
496 	if (*arg == 0)
497 		list_add_tail(&f->list, &head->filters);
498 
499 	tcf_tree_unlock(tp);
500 
501 	*arg = (unsigned long)f;
502 	return 0;
503 
504 err2:
505 	tcf_em_tree_destroy(tp, &t);
506 err1:
507 	tcf_exts_destroy(tp, &e);
508 	return err;
509 }
510 
511 static void flow_destroy_filter(struct tcf_proto *tp, struct flow_filter *f)
512 {
513 	del_timer_sync(&f->perturb_timer);
514 	tcf_exts_destroy(tp, &f->exts);
515 	tcf_em_tree_destroy(tp, &f->ematches);
516 	kfree(f);
517 }
518 
519 static int flow_delete(struct tcf_proto *tp, unsigned long arg)
520 {
521 	struct flow_filter *f = (struct flow_filter *)arg;
522 
523 	tcf_tree_lock(tp);
524 	list_del(&f->list);
525 	tcf_tree_unlock(tp);
526 	flow_destroy_filter(tp, f);
527 	return 0;
528 }
529 
530 static int flow_init(struct tcf_proto *tp)
531 {
532 	struct flow_head *head;
533 
534 	head = kzalloc(sizeof(*head), GFP_KERNEL);
535 	if (head == NULL)
536 		return -ENOBUFS;
537 	INIT_LIST_HEAD(&head->filters);
538 	tp->root = head;
539 	return 0;
540 }
541 
542 static void flow_destroy(struct tcf_proto *tp)
543 {
544 	struct flow_head *head = tp->root;
545 	struct flow_filter *f, *next;
546 
547 	list_for_each_entry_safe(f, next, &head->filters, list) {
548 		list_del(&f->list);
549 		flow_destroy_filter(tp, f);
550 	}
551 	kfree(head);
552 }
553 
554 static unsigned long flow_get(struct tcf_proto *tp, u32 handle)
555 {
556 	struct flow_head *head = tp->root;
557 	struct flow_filter *f;
558 
559 	list_for_each_entry(f, &head->filters, list)
560 		if (f->handle == handle)
561 			return (unsigned long)f;
562 	return 0;
563 }
564 
565 static void flow_put(struct tcf_proto *tp, unsigned long f)
566 {
567 }
568 
569 static int flow_dump(struct tcf_proto *tp, unsigned long fh,
570 		     struct sk_buff *skb, struct tcmsg *t)
571 {
572 	struct flow_filter *f = (struct flow_filter *)fh;
573 	struct nlattr *nest;
574 
575 	if (f == NULL)
576 		return skb->len;
577 
578 	t->tcm_handle = f->handle;
579 
580 	nest = nla_nest_start(skb, TCA_OPTIONS);
581 	if (nest == NULL)
582 		goto nla_put_failure;
583 
584 	if (nla_put_u32(skb, TCA_FLOW_KEYS, f->keymask) ||
585 	    nla_put_u32(skb, TCA_FLOW_MODE, f->mode))
586 		goto nla_put_failure;
587 
588 	if (f->mask != ~0 || f->xor != 0) {
589 		if (nla_put_u32(skb, TCA_FLOW_MASK, f->mask) ||
590 		    nla_put_u32(skb, TCA_FLOW_XOR, f->xor))
591 			goto nla_put_failure;
592 	}
593 	if (f->rshift &&
594 	    nla_put_u32(skb, TCA_FLOW_RSHIFT, f->rshift))
595 		goto nla_put_failure;
596 	if (f->addend &&
597 	    nla_put_u32(skb, TCA_FLOW_ADDEND, f->addend))
598 		goto nla_put_failure;
599 
600 	if (f->divisor &&
601 	    nla_put_u32(skb, TCA_FLOW_DIVISOR, f->divisor))
602 		goto nla_put_failure;
603 	if (f->baseclass &&
604 	    nla_put_u32(skb, TCA_FLOW_BASECLASS, f->baseclass))
605 		goto nla_put_failure;
606 
607 	if (f->perturb_period &&
608 	    nla_put_u32(skb, TCA_FLOW_PERTURB, f->perturb_period / HZ))
609 		goto nla_put_failure;
610 
611 	if (tcf_exts_dump(skb, &f->exts, &flow_ext_map) < 0)
612 		goto nla_put_failure;
613 #ifdef CONFIG_NET_EMATCH
614 	if (f->ematches.hdr.nmatches &&
615 	    tcf_em_tree_dump(skb, &f->ematches, TCA_FLOW_EMATCHES) < 0)
616 		goto nla_put_failure;
617 #endif
618 	nla_nest_end(skb, nest);
619 
620 	if (tcf_exts_dump_stats(skb, &f->exts, &flow_ext_map) < 0)
621 		goto nla_put_failure;
622 
623 	return skb->len;
624 
625 nla_put_failure:
626 	nlmsg_trim(skb, nest);
627 	return -1;
628 }
629 
630 static void flow_walk(struct tcf_proto *tp, struct tcf_walker *arg)
631 {
632 	struct flow_head *head = tp->root;
633 	struct flow_filter *f;
634 
635 	list_for_each_entry(f, &head->filters, list) {
636 		if (arg->count < arg->skip)
637 			goto skip;
638 		if (arg->fn(tp, (unsigned long)f, arg) < 0) {
639 			arg->stop = 1;
640 			break;
641 		}
642 skip:
643 		arg->count++;
644 	}
645 }
646 
647 static struct tcf_proto_ops cls_flow_ops __read_mostly = {
648 	.kind		= "flow",
649 	.classify	= flow_classify,
650 	.init		= flow_init,
651 	.destroy	= flow_destroy,
652 	.change		= flow_change,
653 	.delete		= flow_delete,
654 	.get		= flow_get,
655 	.put		= flow_put,
656 	.dump		= flow_dump,
657 	.walk		= flow_walk,
658 	.owner		= THIS_MODULE,
659 };
660 
661 static int __init cls_flow_init(void)
662 {
663 	return register_tcf_proto_ops(&cls_flow_ops);
664 }
665 
666 static void __exit cls_flow_exit(void)
667 {
668 	unregister_tcf_proto_ops(&cls_flow_ops);
669 }
670 
671 module_init(cls_flow_init);
672 module_exit(cls_flow_exit);
673 
674 MODULE_LICENSE("GPL");
675 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
676 MODULE_DESCRIPTION("TC flow classifier");
677