1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * net/sched/cls_flow.c Generic flow classifier
4 *
5 * Copyright (c) 2007, 2008 Patrick McHardy <kaber@trash.net>
6 */
7
8 #include <linux/kernel.h>
9 #include <linux/init.h>
10 #include <linux/list.h>
11 #include <linux/jhash.h>
12 #include <linux/random.h>
13 #include <linux/pkt_cls.h>
14 #include <linux/skbuff.h>
15 #include <linux/in.h>
16 #include <linux/ip.h>
17 #include <linux/ipv6.h>
18 #include <linux/if_vlan.h>
19 #include <linux/slab.h>
20 #include <linux/module.h>
21 #include <net/inet_sock.h>
22
23 #include <net/pkt_cls.h>
24 #include <net/ip.h>
25 #include <net/route.h>
26 #include <net/flow_dissector.h>
27 #include <net/tc_wrapper.h>
28
29 #if IS_ENABLED(CONFIG_NF_CONNTRACK)
30 #include <net/netfilter/nf_conntrack.h>
31 #endif
32
33 struct flow_head {
34 struct list_head filters;
35 struct rcu_head rcu;
36 };
37
38 struct flow_filter {
39 struct list_head list;
40 struct tcf_exts exts;
41 struct tcf_ematch_tree ematches;
42 struct tcf_proto *tp;
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 struct rcu_work rwork;
58 };
59
60 static inline u32 addr_fold(void *addr)
61 {
62 unsigned long a = (unsigned long)addr;
63
64 return (a & 0xFFFFFFFF) ^ (BITS_PER_LONG > 32 ? a >> 32 : 0);
65 }
66
67 static u32 flow_get_src(const struct sk_buff *skb, const struct flow_keys *flow)
68 {
69 __be32 src = flow_get_u32_src(flow);
70
71 if (src)
72 return ntohl(src);
73
74 return addr_fold(skb->sk);
75 }
76
77 static u32 flow_get_dst(const struct sk_buff *skb, const struct flow_keys *flow)
78 {
79 __be32 dst = flow_get_u32_dst(flow);
80
81 if (dst)
82 return ntohl(dst);
83
84 return addr_fold(skb_dst(skb)) ^ (__force u16)skb_protocol(skb, true);
85 }
86
87 static u32 flow_get_proto(const struct sk_buff *skb,
88 const struct flow_keys *flow)
89 {
90 return flow->basic.ip_proto;
91 }
92
93 static u32 flow_get_proto_src(const struct sk_buff *skb,
94 const struct flow_keys *flow)
95 {
96 if (flow->ports.ports)
97 return ntohs(flow->ports.src);
98
99 return addr_fold(skb->sk);
100 }
101
102 static u32 flow_get_proto_dst(const struct sk_buff *skb,
103 const struct flow_keys *flow)
104 {
105 if (flow->ports.ports)
106 return ntohs(flow->ports.dst);
107
108 return addr_fold(skb_dst(skb)) ^ (__force u16)skb_protocol(skb, true);
109 }
110
111 static u32 flow_get_iif(const struct sk_buff *skb)
112 {
113 return skb->skb_iif;
114 }
115
116 static u32 flow_get_priority(const struct sk_buff *skb)
117 {
118 return skb->priority;
119 }
120
121 static u32 flow_get_mark(const struct sk_buff *skb)
122 {
123 return skb->mark;
124 }
125
126 static u32 flow_get_nfct(const struct sk_buff *skb)
127 {
128 #if IS_ENABLED(CONFIG_NF_CONNTRACK)
129 return addr_fold(skb_nfct(skb));
130 #else
131 return 0;
132 #endif
133 }
134
135 #if IS_ENABLED(CONFIG_NF_CONNTRACK)
136 #define CTTUPLE(skb, member) \
137 ({ \
138 enum ip_conntrack_info ctinfo; \
139 const struct nf_conn *ct = nf_ct_get(skb, &ctinfo); \
140 if (ct == NULL) \
141 goto fallback; \
142 ct->tuplehash[CTINFO2DIR(ctinfo)].tuple.member; \
143 })
144 #else
145 #define CTTUPLE(skb, member) \
146 ({ \
147 goto fallback; \
148 0; \
149 })
150 #endif
151
152 static u32 flow_get_nfct_src(const struct sk_buff *skb,
153 const struct flow_keys *flow)
154 {
155 switch (skb_protocol(skb, true)) {
156 case htons(ETH_P_IP):
157 return ntohl(CTTUPLE(skb, src.u3.ip));
158 case htons(ETH_P_IPV6):
159 return ntohl(CTTUPLE(skb, src.u3.ip6[3]));
160 }
161 fallback:
162 return flow_get_src(skb, flow);
163 }
164
165 static u32 flow_get_nfct_dst(const struct sk_buff *skb,
166 const struct flow_keys *flow)
167 {
168 switch (skb_protocol(skb, true)) {
169 case htons(ETH_P_IP):
170 return ntohl(CTTUPLE(skb, dst.u3.ip));
171 case htons(ETH_P_IPV6):
172 return ntohl(CTTUPLE(skb, dst.u3.ip6[3]));
173 }
174 fallback:
175 return flow_get_dst(skb, flow);
176 }
177
178 static u32 flow_get_nfct_proto_src(const struct sk_buff *skb,
179 const struct flow_keys *flow)
180 {
181 return ntohs(CTTUPLE(skb, src.u.all));
182 fallback:
183 return flow_get_proto_src(skb, flow);
184 }
185
186 static u32 flow_get_nfct_proto_dst(const struct sk_buff *skb,
187 const struct flow_keys *flow)
188 {
189 return ntohs(CTTUPLE(skb, dst.u.all));
190 fallback:
191 return flow_get_proto_dst(skb, flow);
192 }
193
194 static u32 flow_get_rtclassid(const struct sk_buff *skb)
195 {
196 #ifdef CONFIG_IP_ROUTE_CLASSID
197 if (skb_dst(skb))
198 return skb_dst(skb)->tclassid;
199 #endif
200 return 0;
201 }
202
203 static u32 flow_get_skuid(const struct sk_buff *skb)
204 {
205 struct sock *sk = skb_to_full_sk(skb);
206
207 if (sk && sk->sk_socket && sk->sk_socket->file) {
208 kuid_t skuid = sk->sk_socket->file->f_cred->fsuid;
209
210 return from_kuid(&init_user_ns, skuid);
211 }
212 return 0;
213 }
214
215 static u32 flow_get_skgid(const struct sk_buff *skb)
216 {
217 struct sock *sk = skb_to_full_sk(skb);
218
219 if (sk && sk->sk_socket && sk->sk_socket->file) {
220 kgid_t skgid = sk->sk_socket->file->f_cred->fsgid;
221
222 return from_kgid(&init_user_ns, skgid);
223 }
224 return 0;
225 }
226
227 static u32 flow_get_vlan_tag(const struct sk_buff *skb)
228 {
229 u16 tag;
230
231 if (vlan_get_tag(skb, &tag) < 0)
232 return 0;
233 return tag & VLAN_VID_MASK;
234 }
235
236 static u32 flow_get_rxhash(struct sk_buff *skb)
237 {
238 return skb_get_hash(skb);
239 }
240
241 static u32 flow_key_get(struct sk_buff *skb, int key, struct flow_keys *flow)
242 {
243 switch (key) {
244 case FLOW_KEY_SRC:
245 return flow_get_src(skb, flow);
246 case FLOW_KEY_DST:
247 return flow_get_dst(skb, flow);
248 case FLOW_KEY_PROTO:
249 return flow_get_proto(skb, flow);
250 case FLOW_KEY_PROTO_SRC:
251 return flow_get_proto_src(skb, flow);
252 case FLOW_KEY_PROTO_DST:
253 return flow_get_proto_dst(skb, flow);
254 case FLOW_KEY_IIF:
255 return flow_get_iif(skb);
256 case FLOW_KEY_PRIORITY:
257 return flow_get_priority(skb);
258 case FLOW_KEY_MARK:
259 return flow_get_mark(skb);
260 case FLOW_KEY_NFCT:
261 return flow_get_nfct(skb);
262 case FLOW_KEY_NFCT_SRC:
263 return flow_get_nfct_src(skb, flow);
264 case FLOW_KEY_NFCT_DST:
265 return flow_get_nfct_dst(skb, flow);
266 case FLOW_KEY_NFCT_PROTO_SRC:
267 return flow_get_nfct_proto_src(skb, flow);
268 case FLOW_KEY_NFCT_PROTO_DST:
269 return flow_get_nfct_proto_dst(skb, flow);
270 case FLOW_KEY_RTCLASSID:
271 return flow_get_rtclassid(skb);
272 case FLOW_KEY_SKUID:
273 return flow_get_skuid(skb);
274 case FLOW_KEY_SKGID:
275 return flow_get_skgid(skb);
276 case FLOW_KEY_VLAN_TAG:
277 return flow_get_vlan_tag(skb);
278 case FLOW_KEY_RXHASH:
279 return flow_get_rxhash(skb);
280 default:
281 WARN_ON(1);
282 return 0;
283 }
284 }
285
286 #define FLOW_KEYS_NEEDED ((1 << FLOW_KEY_SRC) | \
287 (1 << FLOW_KEY_DST) | \
288 (1 << FLOW_KEY_PROTO) | \
289 (1 << FLOW_KEY_PROTO_SRC) | \
290 (1 << FLOW_KEY_PROTO_DST) | \
291 (1 << FLOW_KEY_NFCT_SRC) | \
292 (1 << FLOW_KEY_NFCT_DST) | \
293 (1 << FLOW_KEY_NFCT_PROTO_SRC) | \
294 (1 << FLOW_KEY_NFCT_PROTO_DST))
295
296 TC_INDIRECT_SCOPE int flow_classify(struct sk_buff *skb,
297 const struct tcf_proto *tp,
298 struct tcf_result *res)
299 {
300 struct flow_head *head = rcu_dereference_bh(tp->root);
301 struct flow_filter *f;
302 u32 keymask;
303 u32 classid;
304 unsigned int n, key;
305 int r;
306
307 list_for_each_entry_rcu(f, &head->filters, list) {
308 u32 keys[FLOW_KEY_MAX + 1];
309 struct flow_keys flow_keys;
310
311 if (!tcf_em_tree_match(skb, &f->ematches, NULL))
312 continue;
313
314 keymask = f->keymask;
315 if (keymask & FLOW_KEYS_NEEDED)
316 skb_flow_dissect_flow_keys(skb, &flow_keys, 0);
317
318 for (n = 0; n < f->nkeys; n++) {
319 key = ffs(keymask) - 1;
320 keymask &= ~(1 << key);
321 keys[n] = flow_key_get(skb, key, &flow_keys);
322 }
323
324 if (f->mode == FLOW_MODE_HASH)
325 classid = jhash2(keys, f->nkeys, f->hashrnd);
326 else {
327 classid = keys[0];
328 classid = (classid & f->mask) ^ f->xor;
329 classid = (classid >> f->rshift) + f->addend;
330 }
331
332 if (f->divisor)
333 classid %= f->divisor;
334
335 res->class = 0;
336 res->classid = TC_H_MAKE(f->baseclass, f->baseclass + classid);
337
338 r = tcf_exts_exec(skb, &f->exts, res);
339 if (r < 0)
340 continue;
341 return r;
342 }
343 return -1;
344 }
345
346 static void flow_perturbation(struct timer_list *t)
347 {
348 struct flow_filter *f = from_timer(f, t, perturb_timer);
349
350 get_random_bytes(&f->hashrnd, 4);
351 if (f->perturb_period)
352 mod_timer(&f->perturb_timer, jiffies + f->perturb_period);
353 }
354
355 static const struct nla_policy flow_policy[TCA_FLOW_MAX + 1] = {
356 [TCA_FLOW_KEYS] = { .type = NLA_U32 },
357 [TCA_FLOW_MODE] = { .type = NLA_U32 },
358 [TCA_FLOW_BASECLASS] = { .type = NLA_U32 },
359 [TCA_FLOW_RSHIFT] = { .type = NLA_U32 },
360 [TCA_FLOW_ADDEND] = { .type = NLA_U32 },
361 [TCA_FLOW_MASK] = { .type = NLA_U32 },
362 [TCA_FLOW_XOR] = { .type = NLA_U32 },
363 [TCA_FLOW_DIVISOR] = { .type = NLA_U32 },
364 [TCA_FLOW_ACT] = { .type = NLA_NESTED },
365 [TCA_FLOW_POLICE] = { .type = NLA_NESTED },
366 [TCA_FLOW_EMATCHES] = { .type = NLA_NESTED },
367 [TCA_FLOW_PERTURB] = { .type = NLA_U32 },
368 };
369
370 static void __flow_destroy_filter(struct flow_filter *f)
371 {
372 timer_shutdown_sync(&f->perturb_timer);
373 tcf_exts_destroy(&f->exts);
374 tcf_em_tree_destroy(&f->ematches);
375 tcf_exts_put_net(&f->exts);
376 kfree(f);
377 }
378
379 static void flow_destroy_filter_work(struct work_struct *work)
380 {
381 struct flow_filter *f = container_of(to_rcu_work(work),
382 struct flow_filter,
383 rwork);
384 rtnl_lock();
385 __flow_destroy_filter(f);
386 rtnl_unlock();
387 }
388
389 static int flow_change(struct net *net, struct sk_buff *in_skb,
390 struct tcf_proto *tp, unsigned long base,
391 u32 handle, struct nlattr **tca,
392 void **arg, u32 flags,
393 struct netlink_ext_ack *extack)
394 {
395 struct flow_head *head = rtnl_dereference(tp->root);
396 struct flow_filter *fold, *fnew;
397 struct nlattr *opt = tca[TCA_OPTIONS];
398 struct nlattr *tb[TCA_FLOW_MAX + 1];
399 unsigned int nkeys = 0;
400 unsigned int perturb_period = 0;
401 u32 baseclass = 0;
402 u32 keymask = 0;
403 u32 mode;
404 int err;
405
406 if (opt == NULL)
407 return -EINVAL;
408
409 err = nla_parse_nested_deprecated(tb, TCA_FLOW_MAX, opt, flow_policy,
410 NULL);
411 if (err < 0)
412 return err;
413
414 if (tb[TCA_FLOW_BASECLASS]) {
415 baseclass = nla_get_u32(tb[TCA_FLOW_BASECLASS]);
416 if (TC_H_MIN(baseclass) == 0)
417 return -EINVAL;
418 }
419
420 if (tb[TCA_FLOW_KEYS]) {
421 keymask = nla_get_u32(tb[TCA_FLOW_KEYS]);
422
423 nkeys = hweight32(keymask);
424 if (nkeys == 0)
425 return -EINVAL;
426
427 if (fls(keymask) - 1 > FLOW_KEY_MAX)
428 return -EOPNOTSUPP;
429
430 if ((keymask & (FLOW_KEY_SKUID|FLOW_KEY_SKGID)) &&
431 sk_user_ns(NETLINK_CB(in_skb).sk) != &init_user_ns)
432 return -EOPNOTSUPP;
433 }
434
435 fnew = kzalloc(sizeof(*fnew), GFP_KERNEL);
436 if (!fnew)
437 return -ENOBUFS;
438
439 err = tcf_em_tree_validate(tp, tb[TCA_FLOW_EMATCHES], &fnew->ematches);
440 if (err < 0)
441 goto err1;
442
443 err = tcf_exts_init(&fnew->exts, net, TCA_FLOW_ACT, TCA_FLOW_POLICE);
444 if (err < 0)
445 goto err2;
446
447 err = tcf_exts_validate(net, tp, tb, tca[TCA_RATE], &fnew->exts, flags,
448 extack);
449 if (err < 0)
450 goto err2;
451
452 fold = *arg;
453 if (fold) {
454 err = -EINVAL;
455 if (fold->handle != handle && handle)
456 goto err2;
457
458 /* Copy fold into fnew */
459 fnew->tp = fold->tp;
460 fnew->handle = fold->handle;
461 fnew->nkeys = fold->nkeys;
462 fnew->keymask = fold->keymask;
463 fnew->mode = fold->mode;
464 fnew->mask = fold->mask;
465 fnew->xor = fold->xor;
466 fnew->rshift = fold->rshift;
467 fnew->addend = fold->addend;
468 fnew->divisor = fold->divisor;
469 fnew->baseclass = fold->baseclass;
470 fnew->hashrnd = fold->hashrnd;
471
472 mode = fold->mode;
473 if (tb[TCA_FLOW_MODE])
474 mode = nla_get_u32(tb[TCA_FLOW_MODE]);
475 if (mode != FLOW_MODE_HASH && nkeys > 1)
476 goto err2;
477
478 if (mode == FLOW_MODE_HASH)
479 perturb_period = fold->perturb_period;
480 if (tb[TCA_FLOW_PERTURB]) {
481 if (mode != FLOW_MODE_HASH)
482 goto err2;
483 perturb_period = nla_get_u32(tb[TCA_FLOW_PERTURB]) * HZ;
484 }
485 } else {
486 err = -EINVAL;
487 if (!handle)
488 goto err2;
489 if (!tb[TCA_FLOW_KEYS])
490 goto err2;
491
492 mode = FLOW_MODE_MAP;
493 if (tb[TCA_FLOW_MODE])
494 mode = nla_get_u32(tb[TCA_FLOW_MODE]);
495 if (mode != FLOW_MODE_HASH && nkeys > 1)
496 goto err2;
497
498 if (tb[TCA_FLOW_PERTURB]) {
499 if (mode != FLOW_MODE_HASH)
500 goto err2;
501 perturb_period = nla_get_u32(tb[TCA_FLOW_PERTURB]) * HZ;
502 }
503
504 if (TC_H_MAJ(baseclass) == 0) {
505 struct Qdisc *q = tcf_block_q(tp->chain->block);
506
507 baseclass = TC_H_MAKE(q->handle, baseclass);
508 }
509 if (TC_H_MIN(baseclass) == 0)
510 baseclass = TC_H_MAKE(baseclass, 1);
511
512 fnew->handle = handle;
513 fnew->mask = ~0U;
514 fnew->tp = tp;
515 get_random_bytes(&fnew->hashrnd, 4);
516 }
517
518 timer_setup(&fnew->perturb_timer, flow_perturbation, TIMER_DEFERRABLE);
519
520 tcf_block_netif_keep_dst(tp->chain->block);
521
522 if (tb[TCA_FLOW_KEYS]) {
523 fnew->keymask = keymask;
524 fnew->nkeys = nkeys;
525 }
526
527 fnew->mode = mode;
528
529 if (tb[TCA_FLOW_MASK])
530 fnew->mask = nla_get_u32(tb[TCA_FLOW_MASK]);
531 if (tb[TCA_FLOW_XOR])
532 fnew->xor = nla_get_u32(tb[TCA_FLOW_XOR]);
533 if (tb[TCA_FLOW_RSHIFT])
534 fnew->rshift = nla_get_u32(tb[TCA_FLOW_RSHIFT]);
535 if (tb[TCA_FLOW_ADDEND])
536 fnew->addend = nla_get_u32(tb[TCA_FLOW_ADDEND]);
537
538 if (tb[TCA_FLOW_DIVISOR])
539 fnew->divisor = nla_get_u32(tb[TCA_FLOW_DIVISOR]);
540 if (baseclass)
541 fnew->baseclass = baseclass;
542
543 fnew->perturb_period = perturb_period;
544 if (perturb_period)
545 mod_timer(&fnew->perturb_timer, jiffies + perturb_period);
546
547 if (!*arg)
548 list_add_tail_rcu(&fnew->list, &head->filters);
549 else
550 list_replace_rcu(&fold->list, &fnew->list);
551
552 *arg = fnew;
553
554 if (fold) {
555 tcf_exts_get_net(&fold->exts);
556 tcf_queue_work(&fold->rwork, flow_destroy_filter_work);
557 }
558 return 0;
559
560 err2:
561 tcf_exts_destroy(&fnew->exts);
562 tcf_em_tree_destroy(&fnew->ematches);
563 err1:
564 kfree(fnew);
565 return err;
566 }
567
568 static int flow_delete(struct tcf_proto *tp, void *arg, bool *last,
569 bool rtnl_held, struct netlink_ext_ack *extack)
570 {
571 struct flow_head *head = rtnl_dereference(tp->root);
572 struct flow_filter *f = arg;
573
574 list_del_rcu(&f->list);
575 tcf_exts_get_net(&f->exts);
576 tcf_queue_work(&f->rwork, flow_destroy_filter_work);
577 *last = list_empty(&head->filters);
578 return 0;
579 }
580
581 static int flow_init(struct tcf_proto *tp)
582 {
583 struct flow_head *head;
584
585 head = kzalloc(sizeof(*head), GFP_KERNEL);
586 if (head == NULL)
587 return -ENOBUFS;
588 INIT_LIST_HEAD(&head->filters);
589 rcu_assign_pointer(tp->root, head);
590 return 0;
591 }
592
593 static void flow_destroy(struct tcf_proto *tp, bool rtnl_held,
594 struct netlink_ext_ack *extack)
595 {
596 struct flow_head *head = rtnl_dereference(tp->root);
597 struct flow_filter *f, *next;
598
599 list_for_each_entry_safe(f, next, &head->filters, list) {
600 list_del_rcu(&f->list);
601 if (tcf_exts_get_net(&f->exts))
602 tcf_queue_work(&f->rwork, flow_destroy_filter_work);
603 else
604 __flow_destroy_filter(f);
605 }
606 kfree_rcu(head, rcu);
607 }
608
609 static void *flow_get(struct tcf_proto *tp, u32 handle)
610 {
611 struct flow_head *head = rtnl_dereference(tp->root);
612 struct flow_filter *f;
613
614 list_for_each_entry(f, &head->filters, list)
615 if (f->handle == handle)
616 return f;
617 return NULL;
618 }
619
620 static int flow_dump(struct net *net, struct tcf_proto *tp, void *fh,
621 struct sk_buff *skb, struct tcmsg *t, bool rtnl_held)
622 {
623 struct flow_filter *f = fh;
624 struct nlattr *nest;
625
626 if (f == NULL)
627 return skb->len;
628
629 t->tcm_handle = f->handle;
630
631 nest = nla_nest_start_noflag(skb, TCA_OPTIONS);
632 if (nest == NULL)
633 goto nla_put_failure;
634
635 if (nla_put_u32(skb, TCA_FLOW_KEYS, f->keymask) ||
636 nla_put_u32(skb, TCA_FLOW_MODE, f->mode))
637 goto nla_put_failure;
638
639 if (f->mask != ~0 || f->xor != 0) {
640 if (nla_put_u32(skb, TCA_FLOW_MASK, f->mask) ||
641 nla_put_u32(skb, TCA_FLOW_XOR, f->xor))
642 goto nla_put_failure;
643 }
644 if (f->rshift &&
645 nla_put_u32(skb, TCA_FLOW_RSHIFT, f->rshift))
646 goto nla_put_failure;
647 if (f->addend &&
648 nla_put_u32(skb, TCA_FLOW_ADDEND, f->addend))
649 goto nla_put_failure;
650
651 if (f->divisor &&
652 nla_put_u32(skb, TCA_FLOW_DIVISOR, f->divisor))
653 goto nla_put_failure;
654 if (f->baseclass &&
655 nla_put_u32(skb, TCA_FLOW_BASECLASS, f->baseclass))
656 goto nla_put_failure;
657
658 if (f->perturb_period &&
659 nla_put_u32(skb, TCA_FLOW_PERTURB, f->perturb_period / HZ))
660 goto nla_put_failure;
661
662 if (tcf_exts_dump(skb, &f->exts) < 0)
663 goto nla_put_failure;
664 #ifdef CONFIG_NET_EMATCH
665 if (f->ematches.hdr.nmatches &&
666 tcf_em_tree_dump(skb, &f->ematches, TCA_FLOW_EMATCHES) < 0)
667 goto nla_put_failure;
668 #endif
669 nla_nest_end(skb, nest);
670
671 if (tcf_exts_dump_stats(skb, &f->exts) < 0)
672 goto nla_put_failure;
673
674 return skb->len;
675
676 nla_put_failure:
677 nla_nest_cancel(skb, nest);
678 return -1;
679 }
680
681 static void flow_walk(struct tcf_proto *tp, struct tcf_walker *arg,
682 bool rtnl_held)
683 {
684 struct flow_head *head = rtnl_dereference(tp->root);
685 struct flow_filter *f;
686
687 list_for_each_entry(f, &head->filters, list) {
688 if (!tc_cls_stats_dump(tp, arg, f))
689 break;
690 }
691 }
692
693 static struct tcf_proto_ops cls_flow_ops __read_mostly = {
694 .kind = "flow",
695 .classify = flow_classify,
696 .init = flow_init,
697 .destroy = flow_destroy,
698 .change = flow_change,
699 .delete = flow_delete,
700 .get = flow_get,
701 .dump = flow_dump,
702 .walk = flow_walk,
703 .owner = THIS_MODULE,
704 };
705 MODULE_ALIAS_NET_CLS("flow");
706
707 static int __init cls_flow_init(void)
708 {
709 return register_tcf_proto_ops(&cls_flow_ops);
710 }
711
712 static void __exit cls_flow_exit(void)
713 {
714 unregister_tcf_proto_ops(&cls_flow_ops);
715 }
716
717 module_init(cls_flow_init);
718 module_exit(cls_flow_exit);
719
720 MODULE_LICENSE("GPL");
721 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
722 MODULE_DESCRIPTION("TC flow classifier");
723
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