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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
25#include <net/pkt_cls.h>
26#include <net/ip.h>
27#include <net/route.h>
28#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
29#include <net/netfilter/nf_conntrack.h>
30#endif
31
32struct flow_head {
33 struct list_head filters;
34};
35
36struct flow_filter {
37 struct list_head list;
38 struct tcf_exts exts;
39 struct tcf_ematch_tree ematches;
40 struct timer_list perturb_timer;
41 u32 perturb_period;
42 u32 handle;
43
44 u32 nkeys;
45 u32 keymask;
46 u32 mode;
47 u32 mask;
48 u32 xor;
49 u32 rshift;
50 u32 addend;
51 u32 divisor;
52 u32 baseclass;
53 u32 hashrnd;
54};
55
56static const struct tcf_ext_map flow_ext_map = {
57 .action = TCA_FLOW_ACT,
58 .police = TCA_FLOW_POLICE,
59};
60
61static inline u32 addr_fold(void *addr)
62{
63 unsigned long a = (unsigned long)addr;
64
65 return (a & 0xFFFFFFFF) ^ (BITS_PER_LONG > 32 ? a >> 32 : 0);
66}
67
68static u32 flow_get_src(struct sk_buff *skb)
69{
70 switch (skb->protocol) {
71 case htons(ETH_P_IP):
72 if (pskb_network_may_pull(skb, sizeof(struct iphdr)))
73 return ntohl(ip_hdr(skb)->saddr);
74 break;
75 case htons(ETH_P_IPV6):
76 if (pskb_network_may_pull(skb, sizeof(struct ipv6hdr)))
77 return ntohl(ipv6_hdr(skb)->saddr.s6_addr32[3]);
78 break;
79 }
80
81 return addr_fold(skb->sk);
82}
83
84static u32 flow_get_dst(struct sk_buff *skb)
85{
86 switch (skb->protocol) {
87 case htons(ETH_P_IP):
88 if (pskb_network_may_pull(skb, sizeof(struct iphdr)))
89 return ntohl(ip_hdr(skb)->daddr);
90 break;
91 case htons(ETH_P_IPV6):
92 if (pskb_network_may_pull(skb, sizeof(struct ipv6hdr)))
93 return ntohl(ipv6_hdr(skb)->daddr.s6_addr32[3]);
94 break;
95 }
96
97 return addr_fold(skb_dst(skb)) ^ (__force u16)skb->protocol;
98}
99
100static u32 flow_get_proto(struct sk_buff *skb)
101{
102 switch (skb->protocol) {
103 case htons(ETH_P_IP):
104 return pskb_network_may_pull(skb, sizeof(struct iphdr)) ?
105 ip_hdr(skb)->protocol : 0;
106 case htons(ETH_P_IPV6):
107 return pskb_network_may_pull(skb, sizeof(struct ipv6hdr)) ?
108 ipv6_hdr(skb)->nexthdr : 0;
109 default:
110 return 0;
111 }
112}
113
114static u32 flow_get_proto_src(struct sk_buff *skb)
115{
116 switch (skb->protocol) {
117 case htons(ETH_P_IP): {
118 struct iphdr *iph;
119 int poff;
120
121 if (!pskb_network_may_pull(skb, sizeof(*iph)))
122 break;
123 iph = ip_hdr(skb);
124 if (ip_is_fragment(iph))
125 break;
126 poff = proto_ports_offset(iph->protocol);
127 if (poff >= 0 &&
128 pskb_network_may_pull(skb, iph->ihl * 4 + 2 + poff)) {
129 iph = ip_hdr(skb);
130 return ntohs(*(__be16 *)((void *)iph + iph->ihl * 4 +
131 poff));
132 }
133 break;
134 }
135 case htons(ETH_P_IPV6): {
136 struct ipv6hdr *iph;
137 int poff;
138
139 if (!pskb_network_may_pull(skb, sizeof(*iph)))
140 break;
141 iph = ipv6_hdr(skb);
142 poff = proto_ports_offset(iph->nexthdr);
143 if (poff >= 0 &&
144 pskb_network_may_pull(skb, sizeof(*iph) + poff + 2)) {
145 iph = ipv6_hdr(skb);
146 return ntohs(*(__be16 *)((void *)iph + sizeof(*iph) +
147 poff));
148 }
149 break;
150 }
151 }
152
153 return addr_fold(skb->sk);
154}
155
156static u32 flow_get_proto_dst(struct sk_buff *skb)
157{
158 switch (skb->protocol) {
159 case htons(ETH_P_IP): {
160 struct iphdr *iph;
161 int poff;
162
163 if (!pskb_network_may_pull(skb, sizeof(*iph)))
164 break;
165 iph = ip_hdr(skb);
166 if (ip_is_fragment(iph))
167 break;
168 poff = proto_ports_offset(iph->protocol);
169 if (poff >= 0 &&
170 pskb_network_may_pull(skb, iph->ihl * 4 + 4 + poff)) {
171 iph = ip_hdr(skb);
172 return ntohs(*(__be16 *)((void *)iph + iph->ihl * 4 +
173 2 + poff));
174 }
175 break;
176 }
177 case htons(ETH_P_IPV6): {
178 struct ipv6hdr *iph;
179 int poff;
180
181 if (!pskb_network_may_pull(skb, sizeof(*iph)))
182 break;
183 iph = ipv6_hdr(skb);
184 poff = proto_ports_offset(iph->nexthdr);
185 if (poff >= 0 &&
186 pskb_network_may_pull(skb, sizeof(*iph) + poff + 4)) {
187 iph = ipv6_hdr(skb);
188 return ntohs(*(__be16 *)((void *)iph + sizeof(*iph) +
189 poff + 2));
190 }
191 break;
192 }
193 }
194
195 return addr_fold(skb_dst(skb)) ^ (__force u16)skb->protocol;
196}
197
198static u32 flow_get_iif(const struct sk_buff *skb)
199{
200 return skb->skb_iif;
201}
202
203static u32 flow_get_priority(const struct sk_buff *skb)
204{
205 return skb->priority;
206}
207
208static u32 flow_get_mark(const struct sk_buff *skb)
209{
210 return skb->mark;
211}
212
213static u32 flow_get_nfct(const struct sk_buff *skb)
214{
215#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
216 return addr_fold(skb->nfct);
217#else
218 return 0;
219#endif
220}
221
222#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
223#define CTTUPLE(skb, member) \
224({ \
225 enum ip_conntrack_info ctinfo; \
226 struct nf_conn *ct = nf_ct_get(skb, &ctinfo); \
227 if (ct == NULL) \
228 goto fallback; \
229 ct->tuplehash[CTINFO2DIR(ctinfo)].tuple.member; \
230})
231#else
232#define CTTUPLE(skb, member) \
233({ \
234 goto fallback; \
235 0; \
236})
237#endif
238
239static u32 flow_get_nfct_src(struct sk_buff *skb)
240{
241 switch (skb->protocol) {
242 case htons(ETH_P_IP):
243 return ntohl(CTTUPLE(skb, src.u3.ip));
244 case htons(ETH_P_IPV6):
245 return ntohl(CTTUPLE(skb, src.u3.ip6[3]));
246 }
247fallback:
248 return flow_get_src(skb);
249}
250
251static u32 flow_get_nfct_dst(struct sk_buff *skb)
252{
253 switch (skb->protocol) {
254 case htons(ETH_P_IP):
255 return ntohl(CTTUPLE(skb, dst.u3.ip));
256 case htons(ETH_P_IPV6):
257 return ntohl(CTTUPLE(skb, dst.u3.ip6[3]));
258 }
259fallback:
260 return flow_get_dst(skb);
261}
262
263static u32 flow_get_nfct_proto_src(struct sk_buff *skb)
264{
265 return ntohs(CTTUPLE(skb, src.u.all));
266fallback:
267 return flow_get_proto_src(skb);
268}
269
270static u32 flow_get_nfct_proto_dst(struct sk_buff *skb)
271{
272 return ntohs(CTTUPLE(skb, dst.u.all));
273fallback:
274 return flow_get_proto_dst(skb);
275}
276
277static u32 flow_get_rtclassid(const struct sk_buff *skb)
278{
279#ifdef CONFIG_IP_ROUTE_CLASSID
280 if (skb_dst(skb))
281 return skb_dst(skb)->tclassid;
282#endif
283 return 0;
284}
285
286static u32 flow_get_skuid(const struct sk_buff *skb)
287{
288 if (skb->sk && skb->sk->sk_socket && skb->sk->sk_socket->file)
289 return skb->sk->sk_socket->file->f_cred->fsuid;
290 return 0;
291}
292
293static u32 flow_get_skgid(const struct sk_buff *skb)
294{
295 if (skb->sk && skb->sk->sk_socket && skb->sk->sk_socket->file)
296 return skb->sk->sk_socket->file->f_cred->fsgid;
297 return 0;
298}
299
300static u32 flow_get_vlan_tag(const struct sk_buff *skb)
301{
302 u16 uninitialized_var(tag);
303
304 if (vlan_get_tag(skb, &tag) < 0)
305 return 0;
306 return tag & VLAN_VID_MASK;
307}
308
309static u32 flow_get_rxhash(struct sk_buff *skb)
310{
311 return skb_get_rxhash(skb);
312}
313
314static u32 flow_key_get(struct sk_buff *skb, int key)
315{
316 switch (key) {
317 case FLOW_KEY_SRC:
318 return flow_get_src(skb);
319 case FLOW_KEY_DST:
320 return flow_get_dst(skb);
321 case FLOW_KEY_PROTO:
322 return flow_get_proto(skb);
323 case FLOW_KEY_PROTO_SRC:
324 return flow_get_proto_src(skb);
325 case FLOW_KEY_PROTO_DST:
326 return flow_get_proto_dst(skb);
327 case FLOW_KEY_IIF:
328 return flow_get_iif(skb);
329 case FLOW_KEY_PRIORITY:
330 return flow_get_priority(skb);
331 case FLOW_KEY_MARK:
332 return flow_get_mark(skb);
333 case FLOW_KEY_NFCT:
334 return flow_get_nfct(skb);
335 case FLOW_KEY_NFCT_SRC:
336 return flow_get_nfct_src(skb);
337 case FLOW_KEY_NFCT_DST:
338 return flow_get_nfct_dst(skb);
339 case FLOW_KEY_NFCT_PROTO_SRC:
340 return flow_get_nfct_proto_src(skb);
341 case FLOW_KEY_NFCT_PROTO_DST:
342 return flow_get_nfct_proto_dst(skb);
343 case FLOW_KEY_RTCLASSID:
344 return flow_get_rtclassid(skb);
345 case FLOW_KEY_SKUID:
346 return flow_get_skuid(skb);
347 case FLOW_KEY_SKGID:
348 return flow_get_skgid(skb);
349 case FLOW_KEY_VLAN_TAG:
350 return flow_get_vlan_tag(skb);
351 case FLOW_KEY_RXHASH:
352 return flow_get_rxhash(skb);
353 default:
354 WARN_ON(1);
355 return 0;
356 }
357}
358
359static int flow_classify(struct sk_buff *skb, const struct tcf_proto *tp,
360 struct tcf_result *res)
361{
362 struct flow_head *head = tp->root;
363 struct flow_filter *f;
364 u32 keymask;
365 u32 classid;
366 unsigned int n, key;
367 int r;
368
369 list_for_each_entry(f, &head->filters, list) {
370 u32 keys[f->nkeys];
371
372 if (!tcf_em_tree_match(skb, &f->ematches, NULL))
373 continue;
374
375 keymask = f->keymask;
376
377 for (n = 0; n < f->nkeys; n++) {
378 key = ffs(keymask) - 1;
379 keymask &= ~(1 << key);
380 keys[n] = flow_key_get(skb, key);
381 }
382
383 if (f->mode == FLOW_MODE_HASH)
384 classid = jhash2(keys, f->nkeys, f->hashrnd);
385 else {
386 classid = keys[0];
387 classid = (classid & f->mask) ^ f->xor;
388 classid = (classid >> f->rshift) + f->addend;
389 }
390
391 if (f->divisor)
392 classid %= f->divisor;
393
394 res->class = 0;
395 res->classid = TC_H_MAKE(f->baseclass, f->baseclass + classid);
396
397 r = tcf_exts_exec(skb, &f->exts, res);
398 if (r < 0)
399 continue;
400 return r;
401 }
402 return -1;
403}
404
405static void flow_perturbation(unsigned long arg)
406{
407 struct flow_filter *f = (struct flow_filter *)arg;
408
409 get_random_bytes(&f->hashrnd, 4);
410 if (f->perturb_period)
411 mod_timer(&f->perturb_timer, jiffies + f->perturb_period);
412}
413
414static const struct nla_policy flow_policy[TCA_FLOW_MAX + 1] = {
415 [TCA_FLOW_KEYS] = { .type = NLA_U32 },
416 [TCA_FLOW_MODE] = { .type = NLA_U32 },
417 [TCA_FLOW_BASECLASS] = { .type = NLA_U32 },
418 [TCA_FLOW_RSHIFT] = { .type = NLA_U32 },
419 [TCA_FLOW_ADDEND] = { .type = NLA_U32 },
420 [TCA_FLOW_MASK] = { .type = NLA_U32 },
421 [TCA_FLOW_XOR] = { .type = NLA_U32 },
422 [TCA_FLOW_DIVISOR] = { .type = NLA_U32 },
423 [TCA_FLOW_ACT] = { .type = NLA_NESTED },
424 [TCA_FLOW_POLICE] = { .type = NLA_NESTED },
425 [TCA_FLOW_EMATCHES] = { .type = NLA_NESTED },
426 [TCA_FLOW_PERTURB] = { .type = NLA_U32 },
427};
428
429static int flow_change(struct tcf_proto *tp, unsigned long base,
430 u32 handle, struct nlattr **tca,
431 unsigned long *arg)
432{
433 struct flow_head *head = tp->root;
434 struct flow_filter *f;
435 struct nlattr *opt = tca[TCA_OPTIONS];
436 struct nlattr *tb[TCA_FLOW_MAX + 1];
437 struct tcf_exts e;
438 struct tcf_ematch_tree t;
439 unsigned int nkeys = 0;
440 unsigned int perturb_period = 0;
441 u32 baseclass = 0;
442 u32 keymask = 0;
443 u32 mode;
444 int err;
445
446 if (opt == NULL)
447 return -EINVAL;
448
449 err = nla_parse_nested(tb, TCA_FLOW_MAX, opt, flow_policy);
450 if (err < 0)
451 return err;
452
453 if (tb[TCA_FLOW_BASECLASS]) {
454 baseclass = nla_get_u32(tb[TCA_FLOW_BASECLASS]);
455 if (TC_H_MIN(baseclass) == 0)
456 return -EINVAL;
457 }
458
459 if (tb[TCA_FLOW_KEYS]) {
460 keymask = nla_get_u32(tb[TCA_FLOW_KEYS]);
461
462 nkeys = hweight32(keymask);
463 if (nkeys == 0)
464 return -EINVAL;
465
466 if (fls(keymask) - 1 > FLOW_KEY_MAX)
467 return -EOPNOTSUPP;
468 }
469
470 err = tcf_exts_validate(tp, tb, tca[TCA_RATE], &e, &flow_ext_map);
471 if (err < 0)
472 return err;
473
474 err = tcf_em_tree_validate(tp, tb[TCA_FLOW_EMATCHES], &t);
475 if (err < 0)
476 goto err1;
477
478 f = (struct flow_filter *)*arg;
479 if (f != NULL) {
480 err = -EINVAL;
481 if (f->handle != handle && handle)
482 goto err2;
483
484 mode = f->mode;
485 if (tb[TCA_FLOW_MODE])
486 mode = nla_get_u32(tb[TCA_FLOW_MODE]);
487 if (mode != FLOW_MODE_HASH && nkeys > 1)
488 goto err2;
489
490 if (mode == FLOW_MODE_HASH)
491 perturb_period = f->perturb_period;
492 if (tb[TCA_FLOW_PERTURB]) {
493 if (mode != FLOW_MODE_HASH)
494 goto err2;
495 perturb_period = nla_get_u32(tb[TCA_FLOW_PERTURB]) * HZ;
496 }
497 } else {
498 err = -EINVAL;
499 if (!handle)
500 goto err2;
501 if (!tb[TCA_FLOW_KEYS])
502 goto err2;
503
504 mode = FLOW_MODE_MAP;
505 if (tb[TCA_FLOW_MODE])
506 mode = nla_get_u32(tb[TCA_FLOW_MODE]);
507 if (mode != FLOW_MODE_HASH && nkeys > 1)
508 goto err2;
509
510 if (tb[TCA_FLOW_PERTURB]) {
511 if (mode != FLOW_MODE_HASH)
512 goto err2;
513 perturb_period = nla_get_u32(tb[TCA_FLOW_PERTURB]) * HZ;
514 }
515
516 if (TC_H_MAJ(baseclass) == 0)
517 baseclass = TC_H_MAKE(tp->q->handle, baseclass);
518 if (TC_H_MIN(baseclass) == 0)
519 baseclass = TC_H_MAKE(baseclass, 1);
520
521 err = -ENOBUFS;
522 f = kzalloc(sizeof(*f), GFP_KERNEL);
523 if (f == NULL)
524 goto err2;
525
526 f->handle = handle;
527 f->mask = ~0U;
528
529 get_random_bytes(&f->hashrnd, 4);
530 f->perturb_timer.function = flow_perturbation;
531 f->perturb_timer.data = (unsigned long)f;
532 init_timer_deferrable(&f->perturb_timer);
533 }
534
535 tcf_exts_change(tp, &f->exts, &e);
536 tcf_em_tree_change(tp, &f->ematches, &t);
537
538 tcf_tree_lock(tp);
539
540 if (tb[TCA_FLOW_KEYS]) {
541 f->keymask = keymask;
542 f->nkeys = nkeys;
543 }
544
545 f->mode = mode;
546
547 if (tb[TCA_FLOW_MASK])
548 f->mask = nla_get_u32(tb[TCA_FLOW_MASK]);
549 if (tb[TCA_FLOW_XOR])
550 f->xor = nla_get_u32(tb[TCA_FLOW_XOR]);
551 if (tb[TCA_FLOW_RSHIFT])
552 f->rshift = nla_get_u32(tb[TCA_FLOW_RSHIFT]);
553 if (tb[TCA_FLOW_ADDEND])
554 f->addend = nla_get_u32(tb[TCA_FLOW_ADDEND]);
555
556 if (tb[TCA_FLOW_DIVISOR])
557 f->divisor = nla_get_u32(tb[TCA_FLOW_DIVISOR]);
558 if (baseclass)
559 f->baseclass = baseclass;
560
561 f->perturb_period = perturb_period;
562 del_timer(&f->perturb_timer);
563 if (perturb_period)
564 mod_timer(&f->perturb_timer, jiffies + perturb_period);
565
566 if (*arg == 0)
567 list_add_tail(&f->list, &head->filters);
568
569 tcf_tree_unlock(tp);
570
571 *arg = (unsigned long)f;
572 return 0;
573
574err2:
575 tcf_em_tree_destroy(tp, &t);
576err1:
577 tcf_exts_destroy(tp, &e);
578 return err;
579}
580
581static void flow_destroy_filter(struct tcf_proto *tp, struct flow_filter *f)
582{
583 del_timer_sync(&f->perturb_timer);
584 tcf_exts_destroy(tp, &f->exts);
585 tcf_em_tree_destroy(tp, &f->ematches);
586 kfree(f);
587}
588
589static int flow_delete(struct tcf_proto *tp, unsigned long arg)
590{
591 struct flow_filter *f = (struct flow_filter *)arg;
592
593 tcf_tree_lock(tp);
594 list_del(&f->list);
595 tcf_tree_unlock(tp);
596 flow_destroy_filter(tp, f);
597 return 0;
598}
599
600static int flow_init(struct tcf_proto *tp)
601{
602 struct flow_head *head;
603
604 head = kzalloc(sizeof(*head), GFP_KERNEL);
605 if (head == NULL)
606 return -ENOBUFS;
607 INIT_LIST_HEAD(&head->filters);
608 tp->root = head;
609 return 0;
610}
611
612static void flow_destroy(struct tcf_proto *tp)
613{
614 struct flow_head *head = tp->root;
615 struct flow_filter *f, *next;
616
617 list_for_each_entry_safe(f, next, &head->filters, list) {
618 list_del(&f->list);
619 flow_destroy_filter(tp, f);
620 }
621 kfree(head);
622}
623
624static unsigned long flow_get(struct tcf_proto *tp, u32 handle)
625{
626 struct flow_head *head = tp->root;
627 struct flow_filter *f;
628
629 list_for_each_entry(f, &head->filters, list)
630 if (f->handle == handle)
631 return (unsigned long)f;
632 return 0;
633}
634
635static void flow_put(struct tcf_proto *tp, unsigned long f)
636{
637}
638
639static int flow_dump(struct tcf_proto *tp, unsigned long fh,
640 struct sk_buff *skb, struct tcmsg *t)
641{
642 struct flow_filter *f = (struct flow_filter *)fh;
643 struct nlattr *nest;
644
645 if (f == NULL)
646 return skb->len;
647
648 t->tcm_handle = f->handle;
649
650 nest = nla_nest_start(skb, TCA_OPTIONS);
651 if (nest == NULL)
652 goto nla_put_failure;
653
654 NLA_PUT_U32(skb, TCA_FLOW_KEYS, f->keymask);
655 NLA_PUT_U32(skb, TCA_FLOW_MODE, f->mode);
656
657 if (f->mask != ~0 || f->xor != 0) {
658 NLA_PUT_U32(skb, TCA_FLOW_MASK, f->mask);
659 NLA_PUT_U32(skb, TCA_FLOW_XOR, f->xor);
660 }
661 if (f->rshift)
662 NLA_PUT_U32(skb, TCA_FLOW_RSHIFT, f->rshift);
663 if (f->addend)
664 NLA_PUT_U32(skb, TCA_FLOW_ADDEND, f->addend);
665
666 if (f->divisor)
667 NLA_PUT_U32(skb, TCA_FLOW_DIVISOR, f->divisor);
668 if (f->baseclass)
669 NLA_PUT_U32(skb, TCA_FLOW_BASECLASS, f->baseclass);
670
671 if (f->perturb_period)
672 NLA_PUT_U32(skb, TCA_FLOW_PERTURB, f->perturb_period / HZ);
673
674 if (tcf_exts_dump(skb, &f->exts, &flow_ext_map) < 0)
675 goto nla_put_failure;
676#ifdef CONFIG_NET_EMATCH
677 if (f->ematches.hdr.nmatches &&
678 tcf_em_tree_dump(skb, &f->ematches, TCA_FLOW_EMATCHES) < 0)
679 goto nla_put_failure;
680#endif
681 nla_nest_end(skb, nest);
682
683 if (tcf_exts_dump_stats(skb, &f->exts, &flow_ext_map) < 0)
684 goto nla_put_failure;
685
686 return skb->len;
687
688nla_put_failure:
689 nlmsg_trim(skb, nest);
690 return -1;
691}
692
693static void flow_walk(struct tcf_proto *tp, struct tcf_walker *arg)
694{
695 struct flow_head *head = tp->root;
696 struct flow_filter *f;
697
698 list_for_each_entry(f, &head->filters, list) {
699 if (arg->count < arg->skip)
700 goto skip;
701 if (arg->fn(tp, (unsigned long)f, arg) < 0) {
702 arg->stop = 1;
703 break;
704 }
705skip:
706 arg->count++;
707 }
708}
709
710static struct tcf_proto_ops cls_flow_ops __read_mostly = {
711 .kind = "flow",
712 .classify = flow_classify,
713 .init = flow_init,
714 .destroy = flow_destroy,
715 .change = flow_change,
716 .delete = flow_delete,
717 .get = flow_get,
718 .put = flow_put,
719 .dump = flow_dump,
720 .walk = flow_walk,
721 .owner = THIS_MODULE,
722};
723
724static int __init cls_flow_init(void)
725{
726 return register_tcf_proto_ops(&cls_flow_ops);
727}
728
729static void __exit cls_flow_exit(void)
730{
731 unregister_tcf_proto_ops(&cls_flow_ops);
732}
733
734module_init(cls_flow_init);
735module_exit(cls_flow_exit);
736
737MODULE_LICENSE("GPL");
738MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
739MODULE_DESCRIPTION("TC flow classifier");
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#include <net/inet_sock.h>
26
27#include <net/pkt_cls.h>
28#include <net/ip.h>
29#include <net/route.h>
30#include <net/flow_dissector.h>
31
32#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
33#include <net/netfilter/nf_conntrack.h>
34#endif
35
36struct flow_head {
37 struct list_head filters;
38 struct rcu_head rcu;
39};
40
41struct flow_filter {
42 struct list_head list;
43 struct tcf_exts exts;
44 struct tcf_ematch_tree ematches;
45 struct tcf_proto *tp;
46 struct timer_list perturb_timer;
47 u32 perturb_period;
48 u32 handle;
49
50 u32 nkeys;
51 u32 keymask;
52 u32 mode;
53 u32 mask;
54 u32 xor;
55 u32 rshift;
56 u32 addend;
57 u32 divisor;
58 u32 baseclass;
59 u32 hashrnd;
60 struct rcu_head rcu;
61};
62
63static inline u32 addr_fold(void *addr)
64{
65 unsigned long a = (unsigned long)addr;
66
67 return (a & 0xFFFFFFFF) ^ (BITS_PER_LONG > 32 ? a >> 32 : 0);
68}
69
70static u32 flow_get_src(const struct sk_buff *skb, const struct flow_keys *flow)
71{
72 __be32 src = flow_get_u32_src(flow);
73
74 if (src)
75 return ntohl(src);
76
77 return addr_fold(skb->sk);
78}
79
80static u32 flow_get_dst(const struct sk_buff *skb, const struct flow_keys *flow)
81{
82 __be32 dst = flow_get_u32_dst(flow);
83
84 if (dst)
85 return ntohl(dst);
86
87 return addr_fold(skb_dst(skb)) ^ (__force u16) tc_skb_protocol(skb);
88}
89
90static u32 flow_get_proto(const struct sk_buff *skb, const struct flow_keys *flow)
91{
92 return flow->basic.ip_proto;
93}
94
95static u32 flow_get_proto_src(const struct sk_buff *skb, const struct flow_keys *flow)
96{
97 if (flow->ports.ports)
98 return ntohs(flow->ports.src);
99
100 return addr_fold(skb->sk);
101}
102
103static u32 flow_get_proto_dst(const struct sk_buff *skb, 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) tc_skb_protocol(skb);
109}
110
111static u32 flow_get_iif(const struct sk_buff *skb)
112{
113 return skb->skb_iif;
114}
115
116static u32 flow_get_priority(const struct sk_buff *skb)
117{
118 return skb->priority;
119}
120
121static u32 flow_get_mark(const struct sk_buff *skb)
122{
123 return skb->mark;
124}
125
126static u32 flow_get_nfct(const struct sk_buff *skb)
127{
128#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
129 return addr_fold(skb->nfct);
130#else
131 return 0;
132#endif
133}
134
135#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
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
152static u32 flow_get_nfct_src(const struct sk_buff *skb, const struct flow_keys *flow)
153{
154 switch (tc_skb_protocol(skb)) {
155 case htons(ETH_P_IP):
156 return ntohl(CTTUPLE(skb, src.u3.ip));
157 case htons(ETH_P_IPV6):
158 return ntohl(CTTUPLE(skb, src.u3.ip6[3]));
159 }
160fallback:
161 return flow_get_src(skb, flow);
162}
163
164static u32 flow_get_nfct_dst(const struct sk_buff *skb, const struct flow_keys *flow)
165{
166 switch (tc_skb_protocol(skb)) {
167 case htons(ETH_P_IP):
168 return ntohl(CTTUPLE(skb, dst.u3.ip));
169 case htons(ETH_P_IPV6):
170 return ntohl(CTTUPLE(skb, dst.u3.ip6[3]));
171 }
172fallback:
173 return flow_get_dst(skb, flow);
174}
175
176static u32 flow_get_nfct_proto_src(const struct sk_buff *skb, const struct flow_keys *flow)
177{
178 return ntohs(CTTUPLE(skb, src.u.all));
179fallback:
180 return flow_get_proto_src(skb, flow);
181}
182
183static u32 flow_get_nfct_proto_dst(const struct sk_buff *skb, const struct flow_keys *flow)
184{
185 return ntohs(CTTUPLE(skb, dst.u.all));
186fallback:
187 return flow_get_proto_dst(skb, flow);
188}
189
190static u32 flow_get_rtclassid(const struct sk_buff *skb)
191{
192#ifdef CONFIG_IP_ROUTE_CLASSID
193 if (skb_dst(skb))
194 return skb_dst(skb)->tclassid;
195#endif
196 return 0;
197}
198
199static u32 flow_get_skuid(const struct sk_buff *skb)
200{
201 struct sock *sk = skb_to_full_sk(skb);
202
203 if (sk && sk->sk_socket && sk->sk_socket->file) {
204 kuid_t skuid = sk->sk_socket->file->f_cred->fsuid;
205
206 return from_kuid(&init_user_ns, skuid);
207 }
208 return 0;
209}
210
211static u32 flow_get_skgid(const struct sk_buff *skb)
212{
213 struct sock *sk = skb_to_full_sk(skb);
214
215 if (sk && sk->sk_socket && sk->sk_socket->file) {
216 kgid_t skgid = sk->sk_socket->file->f_cred->fsgid;
217
218 return from_kgid(&init_user_ns, skgid);
219 }
220 return 0;
221}
222
223static u32 flow_get_vlan_tag(const struct sk_buff *skb)
224{
225 u16 uninitialized_var(tag);
226
227 if (vlan_get_tag(skb, &tag) < 0)
228 return 0;
229 return tag & VLAN_VID_MASK;
230}
231
232static u32 flow_get_rxhash(struct sk_buff *skb)
233{
234 return skb_get_hash(skb);
235}
236
237static u32 flow_key_get(struct sk_buff *skb, int key, struct flow_keys *flow)
238{
239 switch (key) {
240 case FLOW_KEY_SRC:
241 return flow_get_src(skb, flow);
242 case FLOW_KEY_DST:
243 return flow_get_dst(skb, flow);
244 case FLOW_KEY_PROTO:
245 return flow_get_proto(skb, flow);
246 case FLOW_KEY_PROTO_SRC:
247 return flow_get_proto_src(skb, flow);
248 case FLOW_KEY_PROTO_DST:
249 return flow_get_proto_dst(skb, flow);
250 case FLOW_KEY_IIF:
251 return flow_get_iif(skb);
252 case FLOW_KEY_PRIORITY:
253 return flow_get_priority(skb);
254 case FLOW_KEY_MARK:
255 return flow_get_mark(skb);
256 case FLOW_KEY_NFCT:
257 return flow_get_nfct(skb);
258 case FLOW_KEY_NFCT_SRC:
259 return flow_get_nfct_src(skb, flow);
260 case FLOW_KEY_NFCT_DST:
261 return flow_get_nfct_dst(skb, flow);
262 case FLOW_KEY_NFCT_PROTO_SRC:
263 return flow_get_nfct_proto_src(skb, flow);
264 case FLOW_KEY_NFCT_PROTO_DST:
265 return flow_get_nfct_proto_dst(skb, flow);
266 case FLOW_KEY_RTCLASSID:
267 return flow_get_rtclassid(skb);
268 case FLOW_KEY_SKUID:
269 return flow_get_skuid(skb);
270 case FLOW_KEY_SKGID:
271 return flow_get_skgid(skb);
272 case FLOW_KEY_VLAN_TAG:
273 return flow_get_vlan_tag(skb);
274 case FLOW_KEY_RXHASH:
275 return flow_get_rxhash(skb);
276 default:
277 WARN_ON(1);
278 return 0;
279 }
280}
281
282#define FLOW_KEYS_NEEDED ((1 << FLOW_KEY_SRC) | \
283 (1 << FLOW_KEY_DST) | \
284 (1 << FLOW_KEY_PROTO) | \
285 (1 << FLOW_KEY_PROTO_SRC) | \
286 (1 << FLOW_KEY_PROTO_DST) | \
287 (1 << FLOW_KEY_NFCT_SRC) | \
288 (1 << FLOW_KEY_NFCT_DST) | \
289 (1 << FLOW_KEY_NFCT_PROTO_SRC) | \
290 (1 << FLOW_KEY_NFCT_PROTO_DST))
291
292static int flow_classify(struct sk_buff *skb, const struct tcf_proto *tp,
293 struct tcf_result *res)
294{
295 struct flow_head *head = rcu_dereference_bh(tp->root);
296 struct flow_filter *f;
297 u32 keymask;
298 u32 classid;
299 unsigned int n, key;
300 int r;
301
302 list_for_each_entry_rcu(f, &head->filters, list) {
303 u32 keys[FLOW_KEY_MAX + 1];
304 struct flow_keys flow_keys;
305
306 if (!tcf_em_tree_match(skb, &f->ematches, NULL))
307 continue;
308
309 keymask = f->keymask;
310 if (keymask & FLOW_KEYS_NEEDED)
311 skb_flow_dissect_flow_keys(skb, &flow_keys, 0);
312
313 for (n = 0; n < f->nkeys; n++) {
314 key = ffs(keymask) - 1;
315 keymask &= ~(1 << key);
316 keys[n] = flow_key_get(skb, key, &flow_keys);
317 }
318
319 if (f->mode == FLOW_MODE_HASH)
320 classid = jhash2(keys, f->nkeys, f->hashrnd);
321 else {
322 classid = keys[0];
323 classid = (classid & f->mask) ^ f->xor;
324 classid = (classid >> f->rshift) + f->addend;
325 }
326
327 if (f->divisor)
328 classid %= f->divisor;
329
330 res->class = 0;
331 res->classid = TC_H_MAKE(f->baseclass, f->baseclass + classid);
332
333 r = tcf_exts_exec(skb, &f->exts, res);
334 if (r < 0)
335 continue;
336 return r;
337 }
338 return -1;
339}
340
341static void flow_perturbation(unsigned long arg)
342{
343 struct flow_filter *f = (struct flow_filter *)arg;
344
345 get_random_bytes(&f->hashrnd, 4);
346 if (f->perturb_period)
347 mod_timer(&f->perturb_timer, jiffies + f->perturb_period);
348}
349
350static const struct nla_policy flow_policy[TCA_FLOW_MAX + 1] = {
351 [TCA_FLOW_KEYS] = { .type = NLA_U32 },
352 [TCA_FLOW_MODE] = { .type = NLA_U32 },
353 [TCA_FLOW_BASECLASS] = { .type = NLA_U32 },
354 [TCA_FLOW_RSHIFT] = { .type = NLA_U32 },
355 [TCA_FLOW_ADDEND] = { .type = NLA_U32 },
356 [TCA_FLOW_MASK] = { .type = NLA_U32 },
357 [TCA_FLOW_XOR] = { .type = NLA_U32 },
358 [TCA_FLOW_DIVISOR] = { .type = NLA_U32 },
359 [TCA_FLOW_ACT] = { .type = NLA_NESTED },
360 [TCA_FLOW_POLICE] = { .type = NLA_NESTED },
361 [TCA_FLOW_EMATCHES] = { .type = NLA_NESTED },
362 [TCA_FLOW_PERTURB] = { .type = NLA_U32 },
363};
364
365static void flow_destroy_filter(struct rcu_head *head)
366{
367 struct flow_filter *f = container_of(head, struct flow_filter, rcu);
368
369 del_timer_sync(&f->perturb_timer);
370 tcf_exts_destroy(&f->exts);
371 tcf_em_tree_destroy(&f->ematches);
372 kfree(f);
373}
374
375static int flow_change(struct net *net, struct sk_buff *in_skb,
376 struct tcf_proto *tp, unsigned long base,
377 u32 handle, struct nlattr **tca,
378 unsigned long *arg, bool ovr)
379{
380 struct flow_head *head = rtnl_dereference(tp->root);
381 struct flow_filter *fold, *fnew;
382 struct nlattr *opt = tca[TCA_OPTIONS];
383 struct nlattr *tb[TCA_FLOW_MAX + 1];
384 struct tcf_exts e;
385 struct tcf_ematch_tree t;
386 unsigned int nkeys = 0;
387 unsigned int perturb_period = 0;
388 u32 baseclass = 0;
389 u32 keymask = 0;
390 u32 mode;
391 int err;
392
393 if (opt == NULL)
394 return -EINVAL;
395
396 err = nla_parse_nested(tb, TCA_FLOW_MAX, opt, flow_policy);
397 if (err < 0)
398 return err;
399
400 if (tb[TCA_FLOW_BASECLASS]) {
401 baseclass = nla_get_u32(tb[TCA_FLOW_BASECLASS]);
402 if (TC_H_MIN(baseclass) == 0)
403 return -EINVAL;
404 }
405
406 if (tb[TCA_FLOW_KEYS]) {
407 keymask = nla_get_u32(tb[TCA_FLOW_KEYS]);
408
409 nkeys = hweight32(keymask);
410 if (nkeys == 0)
411 return -EINVAL;
412
413 if (fls(keymask) - 1 > FLOW_KEY_MAX)
414 return -EOPNOTSUPP;
415
416 if ((keymask & (FLOW_KEY_SKUID|FLOW_KEY_SKGID)) &&
417 sk_user_ns(NETLINK_CB(in_skb).sk) != &init_user_ns)
418 return -EOPNOTSUPP;
419 }
420
421 tcf_exts_init(&e, TCA_FLOW_ACT, TCA_FLOW_POLICE);
422 err = tcf_exts_validate(net, tp, tb, tca[TCA_RATE], &e, ovr);
423 if (err < 0)
424 return err;
425
426 err = tcf_em_tree_validate(tp, tb[TCA_FLOW_EMATCHES], &t);
427 if (err < 0)
428 goto err1;
429
430 err = -ENOBUFS;
431 fnew = kzalloc(sizeof(*fnew), GFP_KERNEL);
432 if (!fnew)
433 goto err2;
434
435 tcf_exts_init(&fnew->exts, TCA_FLOW_ACT, TCA_FLOW_POLICE);
436
437 fold = (struct flow_filter *)*arg;
438 if (fold) {
439 err = -EINVAL;
440 if (fold->handle != handle && handle)
441 goto err2;
442
443 /* Copy fold into fnew */
444 fnew->tp = fold->tp;
445 fnew->handle = fold->handle;
446 fnew->nkeys = fold->nkeys;
447 fnew->keymask = fold->keymask;
448 fnew->mode = fold->mode;
449 fnew->mask = fold->mask;
450 fnew->xor = fold->xor;
451 fnew->rshift = fold->rshift;
452 fnew->addend = fold->addend;
453 fnew->divisor = fold->divisor;
454 fnew->baseclass = fold->baseclass;
455 fnew->hashrnd = fold->hashrnd;
456
457 mode = fold->mode;
458 if (tb[TCA_FLOW_MODE])
459 mode = nla_get_u32(tb[TCA_FLOW_MODE]);
460 if (mode != FLOW_MODE_HASH && nkeys > 1)
461 goto err2;
462
463 if (mode == FLOW_MODE_HASH)
464 perturb_period = fold->perturb_period;
465 if (tb[TCA_FLOW_PERTURB]) {
466 if (mode != FLOW_MODE_HASH)
467 goto err2;
468 perturb_period = nla_get_u32(tb[TCA_FLOW_PERTURB]) * HZ;
469 }
470 } else {
471 err = -EINVAL;
472 if (!handle)
473 goto err2;
474 if (!tb[TCA_FLOW_KEYS])
475 goto err2;
476
477 mode = FLOW_MODE_MAP;
478 if (tb[TCA_FLOW_MODE])
479 mode = nla_get_u32(tb[TCA_FLOW_MODE]);
480 if (mode != FLOW_MODE_HASH && nkeys > 1)
481 goto err2;
482
483 if (tb[TCA_FLOW_PERTURB]) {
484 if (mode != FLOW_MODE_HASH)
485 goto err2;
486 perturb_period = nla_get_u32(tb[TCA_FLOW_PERTURB]) * HZ;
487 }
488
489 if (TC_H_MAJ(baseclass) == 0)
490 baseclass = TC_H_MAKE(tp->q->handle, baseclass);
491 if (TC_H_MIN(baseclass) == 0)
492 baseclass = TC_H_MAKE(baseclass, 1);
493
494 fnew->handle = handle;
495 fnew->mask = ~0U;
496 fnew->tp = tp;
497 get_random_bytes(&fnew->hashrnd, 4);
498 }
499
500 fnew->perturb_timer.function = flow_perturbation;
501 fnew->perturb_timer.data = (unsigned long)fnew;
502 init_timer_deferrable(&fnew->perturb_timer);
503
504 tcf_exts_change(tp, &fnew->exts, &e);
505 tcf_em_tree_change(tp, &fnew->ematches, &t);
506
507 netif_keep_dst(qdisc_dev(tp->q));
508
509 if (tb[TCA_FLOW_KEYS]) {
510 fnew->keymask = keymask;
511 fnew->nkeys = nkeys;
512 }
513
514 fnew->mode = mode;
515
516 if (tb[TCA_FLOW_MASK])
517 fnew->mask = nla_get_u32(tb[TCA_FLOW_MASK]);
518 if (tb[TCA_FLOW_XOR])
519 fnew->xor = nla_get_u32(tb[TCA_FLOW_XOR]);
520 if (tb[TCA_FLOW_RSHIFT])
521 fnew->rshift = nla_get_u32(tb[TCA_FLOW_RSHIFT]);
522 if (tb[TCA_FLOW_ADDEND])
523 fnew->addend = nla_get_u32(tb[TCA_FLOW_ADDEND]);
524
525 if (tb[TCA_FLOW_DIVISOR])
526 fnew->divisor = nla_get_u32(tb[TCA_FLOW_DIVISOR]);
527 if (baseclass)
528 fnew->baseclass = baseclass;
529
530 fnew->perturb_period = perturb_period;
531 if (perturb_period)
532 mod_timer(&fnew->perturb_timer, jiffies + perturb_period);
533
534 if (*arg == 0)
535 list_add_tail_rcu(&fnew->list, &head->filters);
536 else
537 list_replace_rcu(&fold->list, &fnew->list);
538
539 *arg = (unsigned long)fnew;
540
541 if (fold)
542 call_rcu(&fold->rcu, flow_destroy_filter);
543 return 0;
544
545err2:
546 tcf_em_tree_destroy(&t);
547 kfree(fnew);
548err1:
549 tcf_exts_destroy(&e);
550 return err;
551}
552
553static int flow_delete(struct tcf_proto *tp, unsigned long arg)
554{
555 struct flow_filter *f = (struct flow_filter *)arg;
556
557 list_del_rcu(&f->list);
558 call_rcu(&f->rcu, flow_destroy_filter);
559 return 0;
560}
561
562static int flow_init(struct tcf_proto *tp)
563{
564 struct flow_head *head;
565
566 head = kzalloc(sizeof(*head), GFP_KERNEL);
567 if (head == NULL)
568 return -ENOBUFS;
569 INIT_LIST_HEAD(&head->filters);
570 rcu_assign_pointer(tp->root, head);
571 return 0;
572}
573
574static bool flow_destroy(struct tcf_proto *tp, bool force)
575{
576 struct flow_head *head = rtnl_dereference(tp->root);
577 struct flow_filter *f, *next;
578
579 if (!force && !list_empty(&head->filters))
580 return false;
581
582 list_for_each_entry_safe(f, next, &head->filters, list) {
583 list_del_rcu(&f->list);
584 call_rcu(&f->rcu, flow_destroy_filter);
585 }
586 RCU_INIT_POINTER(tp->root, NULL);
587 kfree_rcu(head, rcu);
588 return true;
589}
590
591static unsigned long flow_get(struct tcf_proto *tp, u32 handle)
592{
593 struct flow_head *head = rtnl_dereference(tp->root);
594 struct flow_filter *f;
595
596 list_for_each_entry(f, &head->filters, list)
597 if (f->handle == handle)
598 return (unsigned long)f;
599 return 0;
600}
601
602static int flow_dump(struct net *net, struct tcf_proto *tp, unsigned long fh,
603 struct sk_buff *skb, struct tcmsg *t)
604{
605 struct flow_filter *f = (struct flow_filter *)fh;
606 struct nlattr *nest;
607
608 if (f == NULL)
609 return skb->len;
610
611 t->tcm_handle = f->handle;
612
613 nest = nla_nest_start(skb, TCA_OPTIONS);
614 if (nest == NULL)
615 goto nla_put_failure;
616
617 if (nla_put_u32(skb, TCA_FLOW_KEYS, f->keymask) ||
618 nla_put_u32(skb, TCA_FLOW_MODE, f->mode))
619 goto nla_put_failure;
620
621 if (f->mask != ~0 || f->xor != 0) {
622 if (nla_put_u32(skb, TCA_FLOW_MASK, f->mask) ||
623 nla_put_u32(skb, TCA_FLOW_XOR, f->xor))
624 goto nla_put_failure;
625 }
626 if (f->rshift &&
627 nla_put_u32(skb, TCA_FLOW_RSHIFT, f->rshift))
628 goto nla_put_failure;
629 if (f->addend &&
630 nla_put_u32(skb, TCA_FLOW_ADDEND, f->addend))
631 goto nla_put_failure;
632
633 if (f->divisor &&
634 nla_put_u32(skb, TCA_FLOW_DIVISOR, f->divisor))
635 goto nla_put_failure;
636 if (f->baseclass &&
637 nla_put_u32(skb, TCA_FLOW_BASECLASS, f->baseclass))
638 goto nla_put_failure;
639
640 if (f->perturb_period &&
641 nla_put_u32(skb, TCA_FLOW_PERTURB, f->perturb_period / HZ))
642 goto nla_put_failure;
643
644 if (tcf_exts_dump(skb, &f->exts) < 0)
645 goto nla_put_failure;
646#ifdef CONFIG_NET_EMATCH
647 if (f->ematches.hdr.nmatches &&
648 tcf_em_tree_dump(skb, &f->ematches, TCA_FLOW_EMATCHES) < 0)
649 goto nla_put_failure;
650#endif
651 nla_nest_end(skb, nest);
652
653 if (tcf_exts_dump_stats(skb, &f->exts) < 0)
654 goto nla_put_failure;
655
656 return skb->len;
657
658nla_put_failure:
659 nla_nest_cancel(skb, nest);
660 return -1;
661}
662
663static void flow_walk(struct tcf_proto *tp, struct tcf_walker *arg)
664{
665 struct flow_head *head = rtnl_dereference(tp->root);
666 struct flow_filter *f;
667
668 list_for_each_entry(f, &head->filters, list) {
669 if (arg->count < arg->skip)
670 goto skip;
671 if (arg->fn(tp, (unsigned long)f, arg) < 0) {
672 arg->stop = 1;
673 break;
674 }
675skip:
676 arg->count++;
677 }
678}
679
680static struct tcf_proto_ops cls_flow_ops __read_mostly = {
681 .kind = "flow",
682 .classify = flow_classify,
683 .init = flow_init,
684 .destroy = flow_destroy,
685 .change = flow_change,
686 .delete = flow_delete,
687 .get = flow_get,
688 .dump = flow_dump,
689 .walk = flow_walk,
690 .owner = THIS_MODULE,
691};
692
693static int __init cls_flow_init(void)
694{
695 return register_tcf_proto_ops(&cls_flow_ops);
696}
697
698static void __exit cls_flow_exit(void)
699{
700 unregister_tcf_proto_ops(&cls_flow_ops);
701}
702
703module_init(cls_flow_init);
704module_exit(cls_flow_exit);
705
706MODULE_LICENSE("GPL");
707MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
708MODULE_DESCRIPTION("TC flow classifier");