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Linux 6.14-rc1
[linux.git] / net / sched / cls_flow.c
blob5c2580a07530e4e0615a7df7ff9d0a35ae9e94b4
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] = NLA_POLICY_MAX(NLA_U32,
360 31 /* BITS_PER_U32 - 1 */),
361 [TCA_FLOW_ADDEND] = { .type = NLA_U32 },
362 [TCA_FLOW_MASK] = { .type = NLA_U32 },
363 [TCA_FLOW_XOR] = { .type = NLA_U32 },
364 [TCA_FLOW_DIVISOR] = { .type = NLA_U32 },
365 [TCA_FLOW_ACT] = { .type = NLA_NESTED },
366 [TCA_FLOW_POLICE] = { .type = NLA_NESTED },
367 [TCA_FLOW_EMATCHES] = { .type = NLA_NESTED },
368 [TCA_FLOW_PERTURB] = { .type = NLA_U32 },
369 };
370
371 static void __flow_destroy_filter(struct flow_filter *f)
372 {
373 timer_shutdown_sync(&f->perturb_timer);
374 tcf_exts_destroy(&f->exts);
375 tcf_em_tree_destroy(&f->ematches);
376 tcf_exts_put_net(&f->exts);
377 kfree(f);
378 }
379
380 static void flow_destroy_filter_work(struct work_struct *work)
381 {
382 struct flow_filter *f = container_of(to_rcu_work(work),
383 struct flow_filter,
384 rwork);
385 rtnl_lock();
386 __flow_destroy_filter(f);
387 rtnl_unlock();
388 }
389
390 static int flow_change(struct net *net, struct sk_buff *in_skb,
391 struct tcf_proto *tp, unsigned long base,
392 u32 handle, struct nlattr **tca,
393 void **arg, u32 flags,
394 struct netlink_ext_ack *extack)
395 {
396 struct flow_head *head = rtnl_dereference(tp->root);
397 struct flow_filter *fold, *fnew;
398 struct nlattr *opt = tca[TCA_OPTIONS];
399 struct nlattr *tb[TCA_FLOW_MAX + 1];
400 unsigned int nkeys = 0;
401 unsigned int perturb_period = 0;
402 u32 baseclass = 0;
403 u32 keymask = 0;
404 u32 mode;
405 int err;
406
407 if (opt == NULL)
408 return -EINVAL;
409
410 err = nla_parse_nested_deprecated(tb, TCA_FLOW_MAX, opt, flow_policy,
411 NULL);
412 if (err < 0)
413 return err;
414
415 if (tb[TCA_FLOW_BASECLASS]) {
416 baseclass = nla_get_u32(tb[TCA_FLOW_BASECLASS]);
417 if (TC_H_MIN(baseclass) == 0)
418 return -EINVAL;
419 }
420
421 if (tb[TCA_FLOW_KEYS]) {
422 keymask = nla_get_u32(tb[TCA_FLOW_KEYS]);
423
424 nkeys = hweight32(keymask);
425 if (nkeys == 0)
426 return -EINVAL;
427
428 if (fls(keymask) - 1 > FLOW_KEY_MAX)
429 return -EOPNOTSUPP;
430
431 if ((keymask & (FLOW_KEY_SKUID|FLOW_KEY_SKGID)) &&
432 sk_user_ns(NETLINK_CB(in_skb).sk) != &init_user_ns)
433 return -EOPNOTSUPP;
434 }
435
436 fnew = kzalloc(sizeof(*fnew), GFP_KERNEL);
437 if (!fnew)
438 return -ENOBUFS;
439
440 err = tcf_em_tree_validate(tp, tb[TCA_FLOW_EMATCHES], &fnew->ematches);
441 if (err < 0)
442 goto err1;
443
444 err = tcf_exts_init(&fnew->exts, net, TCA_FLOW_ACT, TCA_FLOW_POLICE);
445 if (err < 0)
446 goto err2;
447
448 err = tcf_exts_validate(net, tp, tb, tca[TCA_RATE], &fnew->exts, flags,
449 extack);
450 if (err < 0)
451 goto err2;
452
453 fold = *arg;
454 if (fold) {
455 err = -EINVAL;
456 if (fold->handle != handle && handle)
457 goto err2;
458
459 /* Copy fold into fnew */
460 fnew->tp = fold->tp;
461 fnew->handle = fold->handle;
462 fnew->nkeys = fold->nkeys;
463 fnew->keymask = fold->keymask;
464 fnew->mode = fold->mode;
465 fnew->mask = fold->mask;
466 fnew->xor = fold->xor;
467 fnew->rshift = fold->rshift;
468 fnew->addend = fold->addend;
469 fnew->divisor = fold->divisor;
470 fnew->baseclass = fold->baseclass;
471 fnew->hashrnd = fold->hashrnd;
472
473 mode = fold->mode;
474 if (tb[TCA_FLOW_MODE])
475 mode = nla_get_u32(tb[TCA_FLOW_MODE]);
476 if (mode != FLOW_MODE_HASH && nkeys > 1)
477 goto err2;
478
479 if (mode == FLOW_MODE_HASH)
480 perturb_period = fold->perturb_period;
481 if (tb[TCA_FLOW_PERTURB]) {
482 if (mode != FLOW_MODE_HASH)
483 goto err2;
484 perturb_period = nla_get_u32(tb[TCA_FLOW_PERTURB]) * HZ;
485 }
486 } else {
487 err = -EINVAL;
488 if (!handle)
489 goto err2;
490 if (!tb[TCA_FLOW_KEYS])
491 goto err2;
492
493 mode = FLOW_MODE_MAP;
494 if (tb[TCA_FLOW_MODE])
495 mode = nla_get_u32(tb[TCA_FLOW_MODE]);
496 if (mode != FLOW_MODE_HASH && nkeys > 1)
497 goto err2;
498
499 if (tb[TCA_FLOW_PERTURB]) {
500 if (mode != FLOW_MODE_HASH)
501 goto err2;
502 perturb_period = nla_get_u32(tb[TCA_FLOW_PERTURB]) * HZ;
503 }
504
505 if (TC_H_MAJ(baseclass) == 0) {
506 struct Qdisc *q = tcf_block_q(tp->chain->block);
507
508 baseclass = TC_H_MAKE(q->handle, baseclass);
509 }
510 if (TC_H_MIN(baseclass) == 0)
511 baseclass = TC_H_MAKE(baseclass, 1);
512
513 fnew->handle = handle;
514 fnew->mask = ~0U;
515 fnew->tp = tp;
516 get_random_bytes(&fnew->hashrnd, 4);
517 }
518
519 timer_setup(&fnew->perturb_timer, flow_perturbation, TIMER_DEFERRABLE);
520
521 tcf_block_netif_keep_dst(tp->chain->block);
522
523 if (tb[TCA_FLOW_KEYS]) {
524 fnew->keymask = keymask;
525 fnew->nkeys = nkeys;
526 }
527
528 fnew->mode = mode;
529
530 if (tb[TCA_FLOW_MASK])
531 fnew->mask = nla_get_u32(tb[TCA_FLOW_MASK]);
532 if (tb[TCA_FLOW_XOR])
533 fnew->xor = nla_get_u32(tb[TCA_FLOW_XOR]);
534 if (tb[TCA_FLOW_RSHIFT])
535 fnew->rshift = nla_get_u32(tb[TCA_FLOW_RSHIFT]);
536 if (tb[TCA_FLOW_ADDEND])
537 fnew->addend = nla_get_u32(tb[TCA_FLOW_ADDEND]);
538
539 if (tb[TCA_FLOW_DIVISOR])
540 fnew->divisor = nla_get_u32(tb[TCA_FLOW_DIVISOR]);
541 if (baseclass)
542 fnew->baseclass = baseclass;
543
544 fnew->perturb_period = perturb_period;
545 if (perturb_period)
546 mod_timer(&fnew->perturb_timer, jiffies + perturb_period);
547
548 if (!*arg)
549 list_add_tail_rcu(&fnew->list, &head->filters);
550 else
551 list_replace_rcu(&fold->list, &fnew->list);
552
553 *arg = fnew;
554
555 if (fold) {
556 tcf_exts_get_net(&fold->exts);
557 tcf_queue_work(&fold->rwork, flow_destroy_filter_work);
558 }
559 return 0;
560
561 err2:
562 tcf_exts_destroy(&fnew->exts);
563 tcf_em_tree_destroy(&fnew->ematches);
564 err1:
565 kfree(fnew);
566 return err;
567 }
568
569 static int flow_delete(struct tcf_proto *tp, void *arg, bool *last,
570 bool rtnl_held, struct netlink_ext_ack *extack)
571 {
572 struct flow_head *head = rtnl_dereference(tp->root);
573 struct flow_filter *f = arg;
574
575 list_del_rcu(&f->list);
576 tcf_exts_get_net(&f->exts);
577 tcf_queue_work(&f->rwork, flow_destroy_filter_work);
578 *last = list_empty(&head->filters);
579 return 0;
580 }
581
582 static int flow_init(struct tcf_proto *tp)
583 {
584 struct flow_head *head;
585
586 head = kzalloc(sizeof(*head), GFP_KERNEL);
587 if (head == NULL)
588 return -ENOBUFS;
589 INIT_LIST_HEAD(&head->filters);
590 rcu_assign_pointer(tp->root, head);
591 return 0;
592 }
593
594 static void flow_destroy(struct tcf_proto *tp, bool rtnl_held,
595 struct netlink_ext_ack *extack)
596 {
597 struct flow_head *head = rtnl_dereference(tp->root);
598 struct flow_filter *f, *next;
599
600 list_for_each_entry_safe(f, next, &head->filters, list) {
601 list_del_rcu(&f->list);
602 if (tcf_exts_get_net(&f->exts))
603 tcf_queue_work(&f->rwork, flow_destroy_filter_work);
604 else
605 __flow_destroy_filter(f);
606 }
607 kfree_rcu(head, rcu);
608 }
609
610 static void *flow_get(struct tcf_proto *tp, u32 handle)
611 {
612 struct flow_head *head = rtnl_dereference(tp->root);
613 struct flow_filter *f;
614
615 list_for_each_entry(f, &head->filters, list)
616 if (f->handle == handle)
617 return f;
618 return NULL;
619 }
620
621 static int flow_dump(struct net *net, struct tcf_proto *tp, void *fh,
622 struct sk_buff *skb, struct tcmsg *t, bool rtnl_held)
623 {
624 struct flow_filter *f = fh;
625 struct nlattr *nest;
626
627 if (f == NULL)
628 return skb->len;
629
630 t->tcm_handle = f->handle;
631
632 nest = nla_nest_start_noflag(skb, TCA_OPTIONS);
633 if (nest == NULL)
634 goto nla_put_failure;
635
636 if (nla_put_u32(skb, TCA_FLOW_KEYS, f->keymask) ||
637 nla_put_u32(skb, TCA_FLOW_MODE, f->mode))
638 goto nla_put_failure;
639
640 if (f->mask != ~0 || f->xor != 0) {
641 if (nla_put_u32(skb, TCA_FLOW_MASK, f->mask) ||
642 nla_put_u32(skb, TCA_FLOW_XOR, f->xor))
643 goto nla_put_failure;
644 }
645 if (f->rshift &&
646 nla_put_u32(skb, TCA_FLOW_RSHIFT, f->rshift))
647 goto nla_put_failure;
648 if (f->addend &&
649 nla_put_u32(skb, TCA_FLOW_ADDEND, f->addend))
650 goto nla_put_failure;
651
652 if (f->divisor &&
653 nla_put_u32(skb, TCA_FLOW_DIVISOR, f->divisor))
654 goto nla_put_failure;
655 if (f->baseclass &&
656 nla_put_u32(skb, TCA_FLOW_BASECLASS, f->baseclass))
657 goto nla_put_failure;
658
659 if (f->perturb_period &&
660 nla_put_u32(skb, TCA_FLOW_PERTURB, f->perturb_period / HZ))
661 goto nla_put_failure;
662
663 if (tcf_exts_dump(skb, &f->exts) < 0)
664 goto nla_put_failure;
665 #ifdef CONFIG_NET_EMATCH
666 if (f->ematches.hdr.nmatches &&
667 tcf_em_tree_dump(skb, &f->ematches, TCA_FLOW_EMATCHES) < 0)
668 goto nla_put_failure;
669 #endif
670 nla_nest_end(skb, nest);
671
672 if (tcf_exts_dump_stats(skb, &f->exts) < 0)
673 goto nla_put_failure;
674
675 return skb->len;
676
677 nla_put_failure:
678 nla_nest_cancel(skb, nest);
679 return -1;
680 }
681
682 static void flow_walk(struct tcf_proto *tp, struct tcf_walker *arg,
683 bool rtnl_held)
684 {
685 struct flow_head *head = rtnl_dereference(tp->root);
686 struct flow_filter *f;
687
688 list_for_each_entry(f, &head->filters, list) {
689 if (!tc_cls_stats_dump(tp, arg, f))
690 break;
691 }
692 }
693
694 static struct tcf_proto_ops cls_flow_ops __read_mostly = {
695 .kind = "flow",
696 .classify = flow_classify,
697 .init = flow_init,
698 .destroy = flow_destroy,
699 .change = flow_change,
700 .delete = flow_delete,
701 .get = flow_get,
702 .dump = flow_dump,
703 .walk = flow_walk,
704 .owner = THIS_MODULE,
705 };
706 MODULE_ALIAS_NET_CLS("flow");
707
708 static int __init cls_flow_init(void)
709 {
710 return register_tcf_proto_ops(&cls_flow_ops);
711 }
712
713 static void __exit cls_flow_exit(void)
714 {
715 unregister_tcf_proto_ops(&cls_flow_ops);
716 }
717
718 module_init(cls_flow_init);
719 module_exit(cls_flow_exit);
720
721 MODULE_LICENSE("GPL");
722 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
723 MODULE_DESCRIPTION("TC flow classifier");
Linux Kernel