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Merge branch 'drm-fixes' of git://people.freedesktop.org/~airlied/linux
[zen-stable.git] / net / sched / cls_flow.c
blob7b582300d051dcb81765f07714b4e9d16e056a6a
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 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
30 #include <net/netfilter/nf_conntrack.h>
31 #endif
32
33 struct flow_head {
34 struct list_head filters;
35 };
36
37 struct flow_filter {
38 struct list_head list;
39 struct tcf_exts exts;
40 struct tcf_ematch_tree ematches;
41 struct timer_list perturb_timer;
42 u32 perturb_period;
43 u32 handle;
44
45 u32 nkeys;
46 u32 keymask;
47 u32 mode;
48 u32 mask;
49 u32 xor;
50 u32 rshift;
51 u32 addend;
52 u32 divisor;
53 u32 baseclass;
54 u32 hashrnd;
55 };
56
57 static const struct tcf_ext_map flow_ext_map = {
58 .action = TCA_FLOW_ACT,
59 .police = TCA_FLOW_POLICE,
60 };
61
62 static inline u32 addr_fold(void *addr)
63 {
64 unsigned long a = (unsigned long)addr;
65
66 return (a & 0xFFFFFFFF) ^ (BITS_PER_LONG > 32 ? a >> 32 : 0);
67 }
68
69 static u32 flow_get_src(const struct sk_buff *skb, int nhoff)
70 {
71 __be32 *data = NULL, hdata;
72
73 switch (skb->protocol) {
74 case htons(ETH_P_IP):
75 data = skb_header_pointer(skb,
76 nhoff + offsetof(struct iphdr,
77 saddr),
78 4, &hdata);
79 break;
80 case htons(ETH_P_IPV6):
81 data = skb_header_pointer(skb,
82 nhoff + offsetof(struct ipv6hdr,
83 saddr.s6_addr32[3]),
84 4, &hdata);
85 break;
86 }
87
88 if (data)
89 return ntohl(*data);
90 return addr_fold(skb->sk);
91 }
92
93 static u32 flow_get_dst(const struct sk_buff *skb, int nhoff)
94 {
95 __be32 *data = NULL, hdata;
96
97 switch (skb->protocol) {
98 case htons(ETH_P_IP):
99 data = skb_header_pointer(skb,
100 nhoff + offsetof(struct iphdr,
101 daddr),
102 4, &hdata);
103 break;
104 case htons(ETH_P_IPV6):
105 data = skb_header_pointer(skb,
106 nhoff + offsetof(struct ipv6hdr,
107 daddr.s6_addr32[3]),
108 4, &hdata);
109 break;
110 }
111
112 if (data)
113 return ntohl(*data);
114 return addr_fold(skb_dst(skb)) ^ (__force u16)skb->protocol;
115 }
116
117 static u32 flow_get_proto(const struct sk_buff *skb, int nhoff)
118 {
119 __u8 *data = NULL, hdata;
120
121 switch (skb->protocol) {
122 case htons(ETH_P_IP):
123 data = skb_header_pointer(skb,
124 nhoff + offsetof(struct iphdr,
125 protocol),
126 1, &hdata);
127 break;
128 case htons(ETH_P_IPV6):
129 data = skb_header_pointer(skb,
130 nhoff + offsetof(struct ipv6hdr,
131 nexthdr),
132 1, &hdata);
133 break;
134 }
135 if (data)
136 return *data;
137 return 0;
138 }
139
140 /* helper function to get either src or dst port */
141 static __be16 *flow_get_proto_common(const struct sk_buff *skb, int nhoff,
142 __be16 *_port, int dst)
143 {
144 __be16 *port = NULL;
145 int poff;
146
147 switch (skb->protocol) {
148 case htons(ETH_P_IP): {
149 struct iphdr *iph, _iph;
150
151 iph = skb_header_pointer(skb, nhoff, sizeof(_iph), &_iph);
152 if (!iph)
153 break;
154 if (ip_is_fragment(iph))
155 break;
156 poff = proto_ports_offset(iph->protocol);
157 if (poff >= 0)
158 port = skb_header_pointer(skb,
159 nhoff + iph->ihl * 4 + poff + dst,
160 sizeof(*_port), _port);
161 break;
162 }
163 case htons(ETH_P_IPV6): {
164 struct ipv6hdr *iph, _iph;
165
166 iph = skb_header_pointer(skb, nhoff, sizeof(_iph), &_iph);
167 if (!iph)
168 break;
169 poff = proto_ports_offset(iph->nexthdr);
170 if (poff >= 0)
171 port = skb_header_pointer(skb,
172 nhoff + sizeof(*iph) + poff + dst,
173 sizeof(*_port), _port);
174 break;
175 }
176 }
177
178 return port;
179 }
180
181 static u32 flow_get_proto_src(const struct sk_buff *skb, int nhoff)
182 {
183 __be16 _port, *port = flow_get_proto_common(skb, nhoff, &_port, 0);
184
185 if (port)
186 return ntohs(*port);
187
188 return addr_fold(skb->sk);
189 }
190
191 static u32 flow_get_proto_dst(const struct sk_buff *skb, int nhoff)
192 {
193 __be16 _port, *port = flow_get_proto_common(skb, nhoff, &_port, 2);
194
195 if (port)
196 return ntohs(*port);
197
198 return addr_fold(skb_dst(skb)) ^ (__force u16)skb->protocol;
199 }
200
201 static u32 flow_get_iif(const struct sk_buff *skb)
202 {
203 return skb->skb_iif;
204 }
205
206 static u32 flow_get_priority(const struct sk_buff *skb)
207 {
208 return skb->priority;
209 }
210
211 static u32 flow_get_mark(const struct sk_buff *skb)
212 {
213 return skb->mark;
214 }
215
216 static u32 flow_get_nfct(const struct sk_buff *skb)
217 {
218 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
219 return addr_fold(skb->nfct);
220 #else
221 return 0;
222 #endif
223 }
224
225 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
226 #define CTTUPLE(skb, member) \
227 ({ \
228 enum ip_conntrack_info ctinfo; \
229 const struct nf_conn *ct = nf_ct_get(skb, &ctinfo); \
230 if (ct == NULL) \
231 goto fallback; \
232 ct->tuplehash[CTINFO2DIR(ctinfo)].tuple.member; \
233 })
234 #else
235 #define CTTUPLE(skb, member) \
236 ({ \
237 goto fallback; \
238 0; \
239 })
240 #endif
241
242 static u32 flow_get_nfct_src(const struct sk_buff *skb, int nhoff)
243 {
244 switch (skb->protocol) {
245 case htons(ETH_P_IP):
246 return ntohl(CTTUPLE(skb, src.u3.ip));
247 case htons(ETH_P_IPV6):
248 return ntohl(CTTUPLE(skb, src.u3.ip6[3]));
249 }
250 fallback:
251 return flow_get_src(skb, nhoff);
252 }
253
254 static u32 flow_get_nfct_dst(const struct sk_buff *skb, int nhoff)
255 {
256 switch (skb->protocol) {
257 case htons(ETH_P_IP):
258 return ntohl(CTTUPLE(skb, dst.u3.ip));
259 case htons(ETH_P_IPV6):
260 return ntohl(CTTUPLE(skb, dst.u3.ip6[3]));
261 }
262 fallback:
263 return flow_get_dst(skb, nhoff);
264 }
265
266 static u32 flow_get_nfct_proto_src(const struct sk_buff *skb, int nhoff)
267 {
268 return ntohs(CTTUPLE(skb, src.u.all));
269 fallback:
270 return flow_get_proto_src(skb, nhoff);
271 }
272
273 static u32 flow_get_nfct_proto_dst(const struct sk_buff *skb, int nhoff)
274 {
275 return ntohs(CTTUPLE(skb, dst.u.all));
276 fallback:
277 return flow_get_proto_dst(skb, nhoff);
278 }
279
280 static u32 flow_get_rtclassid(const struct sk_buff *skb)
281 {
282 #ifdef CONFIG_IP_ROUTE_CLASSID
283 if (skb_dst(skb))
284 return skb_dst(skb)->tclassid;
285 #endif
286 return 0;
287 }
288
289 static u32 flow_get_skuid(const struct sk_buff *skb)
290 {
291 if (skb->sk && skb->sk->sk_socket && skb->sk->sk_socket->file)
292 return skb->sk->sk_socket->file->f_cred->fsuid;
293 return 0;
294 }
295
296 static u32 flow_get_skgid(const struct sk_buff *skb)
297 {
298 if (skb->sk && skb->sk->sk_socket && skb->sk->sk_socket->file)
299 return skb->sk->sk_socket->file->f_cred->fsgid;
300 return 0;
301 }
302
303 static u32 flow_get_vlan_tag(const struct sk_buff *skb)
304 {
305 u16 uninitialized_var(tag);
306
307 if (vlan_get_tag(skb, &tag) < 0)
308 return 0;
309 return tag & VLAN_VID_MASK;
310 }
311
312 static u32 flow_get_rxhash(struct sk_buff *skb)
313 {
314 return skb_get_rxhash(skb);
315 }
316
317 static u32 flow_key_get(struct sk_buff *skb, int key)
318 {
319 int nhoff = skb_network_offset(skb);
320
321 switch (key) {
322 case FLOW_KEY_SRC:
323 return flow_get_src(skb, nhoff);
324 case FLOW_KEY_DST:
325 return flow_get_dst(skb, nhoff);
326 case FLOW_KEY_PROTO:
327 return flow_get_proto(skb, nhoff);
328 case FLOW_KEY_PROTO_SRC:
329 return flow_get_proto_src(skb, nhoff);
330 case FLOW_KEY_PROTO_DST:
331 return flow_get_proto_dst(skb, nhoff);
332 case FLOW_KEY_IIF:
333 return flow_get_iif(skb);
334 case FLOW_KEY_PRIORITY:
335 return flow_get_priority(skb);
336 case FLOW_KEY_MARK:
337 return flow_get_mark(skb);
338 case FLOW_KEY_NFCT:
339 return flow_get_nfct(skb);
340 case FLOW_KEY_NFCT_SRC:
341 return flow_get_nfct_src(skb, nhoff);
342 case FLOW_KEY_NFCT_DST:
343 return flow_get_nfct_dst(skb, nhoff);
344 case FLOW_KEY_NFCT_PROTO_SRC:
345 return flow_get_nfct_proto_src(skb, nhoff);
346 case FLOW_KEY_NFCT_PROTO_DST:
347 return flow_get_nfct_proto_dst(skb, nhoff);
348 case FLOW_KEY_RTCLASSID:
349 return flow_get_rtclassid(skb);
350 case FLOW_KEY_SKUID:
351 return flow_get_skuid(skb);
352 case FLOW_KEY_SKGID:
353 return flow_get_skgid(skb);
354 case FLOW_KEY_VLAN_TAG:
355 return flow_get_vlan_tag(skb);
356 case FLOW_KEY_RXHASH:
357 return flow_get_rxhash(skb);
358 default:
359 WARN_ON(1);
360 return 0;
361 }
362 }
363
364 static int flow_classify(struct sk_buff *skb, const struct tcf_proto *tp,
365 struct tcf_result *res)
366 {
367 struct flow_head *head = tp->root;
368 struct flow_filter *f;
369 u32 keymask;
370 u32 classid;
371 unsigned int n, key;
372 int r;
373
374 list_for_each_entry(f, &head->filters, list) {
375 u32 keys[f->nkeys];
376
377 if (!tcf_em_tree_match(skb, &f->ematches, NULL))
378 continue;
379
380 keymask = f->keymask;
381
382 for (n = 0; n < f->nkeys; n++) {
383 key = ffs(keymask) - 1;
384 keymask &= ~(1 << key);
385 keys[n] = flow_key_get(skb, key);
386 }
387
388 if (f->mode == FLOW_MODE_HASH)
389 classid = jhash2(keys, f->nkeys, f->hashrnd);
390 else {
391 classid = keys[0];
392 classid = (classid & f->mask) ^ f->xor;
393 classid = (classid >> f->rshift) + f->addend;
394 }
395
396 if (f->divisor)
397 classid %= f->divisor;
398
399 res->class = 0;
400 res->classid = TC_H_MAKE(f->baseclass, f->baseclass + classid);
401
402 r = tcf_exts_exec(skb, &f->exts, res);
403 if (r < 0)
404 continue;
405 return r;
406 }
407 return -1;
408 }
409
410 static void flow_perturbation(unsigned long arg)
411 {
412 struct flow_filter *f = (struct flow_filter *)arg;
413
414 get_random_bytes(&f->hashrnd, 4);
415 if (f->perturb_period)
416 mod_timer(&f->perturb_timer, jiffies + f->perturb_period);
417 }
418
419 static const struct nla_policy flow_policy[TCA_FLOW_MAX + 1] = {
420 [TCA_FLOW_KEYS] = { .type = NLA_U32 },
421 [TCA_FLOW_MODE] = { .type = NLA_U32 },
422 [TCA_FLOW_BASECLASS] = { .type = NLA_U32 },
423 [TCA_FLOW_RSHIFT] = { .type = NLA_U32 },
424 [TCA_FLOW_ADDEND] = { .type = NLA_U32 },
425 [TCA_FLOW_MASK] = { .type = NLA_U32 },
426 [TCA_FLOW_XOR] = { .type = NLA_U32 },
427 [TCA_FLOW_DIVISOR] = { .type = NLA_U32 },
428 [TCA_FLOW_ACT] = { .type = NLA_NESTED },
429 [TCA_FLOW_POLICE] = { .type = NLA_NESTED },
430 [TCA_FLOW_EMATCHES] = { .type = NLA_NESTED },
431 [TCA_FLOW_PERTURB] = { .type = NLA_U32 },
432 };
433
434 static int flow_change(struct tcf_proto *tp, unsigned long base,
435 u32 handle, struct nlattr **tca,
436 unsigned long *arg)
437 {
438 struct flow_head *head = tp->root;
439 struct flow_filter *f;
440 struct nlattr *opt = tca[TCA_OPTIONS];
441 struct nlattr *tb[TCA_FLOW_MAX + 1];
442 struct tcf_exts e;
443 struct tcf_ematch_tree t;
444 unsigned int nkeys = 0;
445 unsigned int perturb_period = 0;
446 u32 baseclass = 0;
447 u32 keymask = 0;
448 u32 mode;
449 int err;
450
451 if (opt == NULL)
452 return -EINVAL;
453
454 err = nla_parse_nested(tb, TCA_FLOW_MAX, opt, flow_policy);
455 if (err < 0)
456 return err;
457
458 if (tb[TCA_FLOW_BASECLASS]) {
459 baseclass = nla_get_u32(tb[TCA_FLOW_BASECLASS]);
460 if (TC_H_MIN(baseclass) == 0)
461 return -EINVAL;
462 }
463
464 if (tb[TCA_FLOW_KEYS]) {
465 keymask = nla_get_u32(tb[TCA_FLOW_KEYS]);
466
467 nkeys = hweight32(keymask);
468 if (nkeys == 0)
469 return -EINVAL;
470
471 if (fls(keymask) - 1 > FLOW_KEY_MAX)
472 return -EOPNOTSUPP;
473 }
474
475 err = tcf_exts_validate(tp, tb, tca[TCA_RATE], &e, &flow_ext_map);
476 if (err < 0)
477 return err;
478
479 err = tcf_em_tree_validate(tp, tb[TCA_FLOW_EMATCHES], &t);
480 if (err < 0)
481 goto err1;
482
483 f = (struct flow_filter *)*arg;
484 if (f != NULL) {
485 err = -EINVAL;
486 if (f->handle != handle && handle)
487 goto err2;
488
489 mode = f->mode;
490 if (tb[TCA_FLOW_MODE])
491 mode = nla_get_u32(tb[TCA_FLOW_MODE]);
492 if (mode != FLOW_MODE_HASH && nkeys > 1)
493 goto err2;
494
495 if (mode == FLOW_MODE_HASH)
496 perturb_period = f->perturb_period;
497 if (tb[TCA_FLOW_PERTURB]) {
498 if (mode != FLOW_MODE_HASH)
499 goto err2;
500 perturb_period = nla_get_u32(tb[TCA_FLOW_PERTURB]) * HZ;
501 }
502 } else {
503 err = -EINVAL;
504 if (!handle)
505 goto err2;
506 if (!tb[TCA_FLOW_KEYS])
507 goto err2;
508
509 mode = FLOW_MODE_MAP;
510 if (tb[TCA_FLOW_MODE])
511 mode = nla_get_u32(tb[TCA_FLOW_MODE]);
512 if (mode != FLOW_MODE_HASH && nkeys > 1)
513 goto err2;
514
515 if (tb[TCA_FLOW_PERTURB]) {
516 if (mode != FLOW_MODE_HASH)
517 goto err2;
518 perturb_period = nla_get_u32(tb[TCA_FLOW_PERTURB]) * HZ;
519 }
520
521 if (TC_H_MAJ(baseclass) == 0)
522 baseclass = TC_H_MAKE(tp->q->handle, baseclass);
523 if (TC_H_MIN(baseclass) == 0)
524 baseclass = TC_H_MAKE(baseclass, 1);
525
526 err = -ENOBUFS;
527 f = kzalloc(sizeof(*f), GFP_KERNEL);
528 if (f == NULL)
529 goto err2;
530
531 f->handle = handle;
532 f->mask = ~0U;
533
534 get_random_bytes(&f->hashrnd, 4);
535 f->perturb_timer.function = flow_perturbation;
536 f->perturb_timer.data = (unsigned long)f;
537 init_timer_deferrable(&f->perturb_timer);
538 }
539
540 tcf_exts_change(tp, &f->exts, &e);
541 tcf_em_tree_change(tp, &f->ematches, &t);
542
543 tcf_tree_lock(tp);
544
545 if (tb[TCA_FLOW_KEYS]) {
546 f->keymask = keymask;
547 f->nkeys = nkeys;
548 }
549
550 f->mode = mode;
551
552 if (tb[TCA_FLOW_MASK])
553 f->mask = nla_get_u32(tb[TCA_FLOW_MASK]);
554 if (tb[TCA_FLOW_XOR])
555 f->xor = nla_get_u32(tb[TCA_FLOW_XOR]);
556 if (tb[TCA_FLOW_RSHIFT])
557 f->rshift = nla_get_u32(tb[TCA_FLOW_RSHIFT]);
558 if (tb[TCA_FLOW_ADDEND])
559 f->addend = nla_get_u32(tb[TCA_FLOW_ADDEND]);
560
561 if (tb[TCA_FLOW_DIVISOR])
562 f->divisor = nla_get_u32(tb[TCA_FLOW_DIVISOR]);
563 if (baseclass)
564 f->baseclass = baseclass;
565
566 f->perturb_period = perturb_period;
567 del_timer(&f->perturb_timer);
568 if (perturb_period)
569 mod_timer(&f->perturb_timer, jiffies + perturb_period);
570
571 if (*arg == 0)
572 list_add_tail(&f->list, &head->filters);
573
574 tcf_tree_unlock(tp);
575
576 *arg = (unsigned long)f;
577 return 0;
578
579 err2:
580 tcf_em_tree_destroy(tp, &t);
581 err1:
582 tcf_exts_destroy(tp, &e);
583 return err;
584 }
585
586 static void flow_destroy_filter(struct tcf_proto *tp, struct flow_filter *f)
587 {
588 del_timer_sync(&f->perturb_timer);
589 tcf_exts_destroy(tp, &f->exts);
590 tcf_em_tree_destroy(tp, &f->ematches);
591 kfree(f);
592 }
593
594 static int flow_delete(struct tcf_proto *tp, unsigned long arg)
595 {
596 struct flow_filter *f = (struct flow_filter *)arg;
597
598 tcf_tree_lock(tp);
599 list_del(&f->list);
600 tcf_tree_unlock(tp);
601 flow_destroy_filter(tp, f);
602 return 0;
603 }
604
605 static int flow_init(struct tcf_proto *tp)
606 {
607 struct flow_head *head;
608
609 head = kzalloc(sizeof(*head), GFP_KERNEL);
610 if (head == NULL)
611 return -ENOBUFS;
612 INIT_LIST_HEAD(&head->filters);
613 tp->root = head;
614 return 0;
615 }
616
617 static void flow_destroy(struct tcf_proto *tp)
618 {
619 struct flow_head *head = tp->root;
620 struct flow_filter *f, *next;
621
622 list_for_each_entry_safe(f, next, &head->filters, list) {
623 list_del(&f->list);
624 flow_destroy_filter(tp, f);
625 }
626 kfree(head);
627 }
628
629 static unsigned long flow_get(struct tcf_proto *tp, u32 handle)
630 {
631 struct flow_head *head = tp->root;
632 struct flow_filter *f;
633
634 list_for_each_entry(f, &head->filters, list)
635 if (f->handle == handle)
636 return (unsigned long)f;
637 return 0;
638 }
639
640 static void flow_put(struct tcf_proto *tp, unsigned long f)
641 {
642 }
643
644 static int flow_dump(struct tcf_proto *tp, unsigned long fh,
645 struct sk_buff *skb, struct tcmsg *t)
646 {
647 struct flow_filter *f = (struct flow_filter *)fh;
648 struct nlattr *nest;
649
650 if (f == NULL)
651 return skb->len;
652
653 t->tcm_handle = f->handle;
654
655 nest = nla_nest_start(skb, TCA_OPTIONS);
656 if (nest == NULL)
657 goto nla_put_failure;
658
659 NLA_PUT_U32(skb, TCA_FLOW_KEYS, f->keymask);
660 NLA_PUT_U32(skb, TCA_FLOW_MODE, f->mode);
661
662 if (f->mask != ~0 || f->xor != 0) {
663 NLA_PUT_U32(skb, TCA_FLOW_MASK, f->mask);
664 NLA_PUT_U32(skb, TCA_FLOW_XOR, f->xor);
665 }
666 if (f->rshift)
667 NLA_PUT_U32(skb, TCA_FLOW_RSHIFT, f->rshift);
668 if (f->addend)
669 NLA_PUT_U32(skb, TCA_FLOW_ADDEND, f->addend);
670
671 if (f->divisor)
672 NLA_PUT_U32(skb, TCA_FLOW_DIVISOR, f->divisor);
673 if (f->baseclass)
674 NLA_PUT_U32(skb, TCA_FLOW_BASECLASS, f->baseclass);
675
676 if (f->perturb_period)
677 NLA_PUT_U32(skb, TCA_FLOW_PERTURB, f->perturb_period / HZ);
678
679 if (tcf_exts_dump(skb, &f->exts, &flow_ext_map) < 0)
680 goto nla_put_failure;
681 #ifdef CONFIG_NET_EMATCH
682 if (f->ematches.hdr.nmatches &&
683 tcf_em_tree_dump(skb, &f->ematches, TCA_FLOW_EMATCHES) < 0)
684 goto nla_put_failure;
685 #endif
686 nla_nest_end(skb, nest);
687
688 if (tcf_exts_dump_stats(skb, &f->exts, &flow_ext_map) < 0)
689 goto nla_put_failure;
690
691 return skb->len;
692
693 nla_put_failure:
694 nlmsg_trim(skb, nest);
695 return -1;
696 }
697
698 static void flow_walk(struct tcf_proto *tp, struct tcf_walker *arg)
699 {
700 struct flow_head *head = tp->root;
701 struct flow_filter *f;
702
703 list_for_each_entry(f, &head->filters, list) {
704 if (arg->count < arg->skip)
705 goto skip;
706 if (arg->fn(tp, (unsigned long)f, arg) < 0) {
707 arg->stop = 1;
708 break;
709 }
710 skip:
711 arg->count++;
712 }
713 }
714
715 static struct tcf_proto_ops cls_flow_ops __read_mostly = {
716 .kind = "flow",
717 .classify = flow_classify,
718 .init = flow_init,
719 .destroy = flow_destroy,
720 .change = flow_change,
721 .delete = flow_delete,
722 .get = flow_get,
723 .put = flow_put,
724 .dump = flow_dump,
725 .walk = flow_walk,
726 .owner = THIS_MODULE,
727 };
728
729 static int __init cls_flow_init(void)
730 {
731 return register_tcf_proto_ops(&cls_flow_ops);
732 }
733
734 static void __exit cls_flow_exit(void)
735 {
736 unregister_tcf_proto_ops(&cls_flow_ops);
737 }
738
739 module_init(cls_flow_init);
740 module_exit(cls_flow_exit);
741
742 MODULE_LICENSE("GPL");
743 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
744 MODULE_DESCRIPTION("TC flow classifier");