1 /* SPDX-License-Identifier: GPL-2.0 */
2 #include <linux/kernel.h>
3 #include <linux/slab.h>
4 #include <net/act_api.h>
5 #include <net/flow_offload.h>
6 #include <linux/rtnetlink.h>
7 #include <linux/mutex.h>
8 #include <linux/rhashtable.h>
9
10 struct flow_rule *flow_rule_alloc(unsigned int num_actions)
11 {
12 struct flow_rule *rule;
13 int i;
14
15 rule = kzalloc(struct_size(rule, action.entries, num_actions),
16 GFP_KERNEL);
17 if (!rule)
18 return NULL;
19
20 rule->action.num_entries = num_actions;
21 /* Pre-fill each action hw_stats with DONT_CARE.
22 * Caller can override this if it wants stats for a given action.
23 */
24 for (i = 0; i < num_actions; i++)
25 rule->action.entries[i].hw_stats = FLOW_ACTION_HW_STATS_DONT_CARE;
26
27 return rule;
28 }
29 EXPORT_SYMBOL(flow_rule_alloc);
30
31 struct flow_offload_action *offload_action_alloc(unsigned int num_actions)
32 {
33 struct flow_offload_action *fl_action;
34 int i;
35
36 fl_action = kzalloc(struct_size(fl_action, action.entries, num_actions),
37 GFP_KERNEL);
38 if (!fl_action)
39 return NULL;
40
41 fl_action->action.num_entries = num_actions;
42 /* Pre-fill each action hw_stats with DONT_CARE.
43 * Caller can override this if it wants stats for a given action.
44 */
45 for (i = 0; i < num_actions; i++)
46 fl_action->action.entries[i].hw_stats = FLOW_ACTION_HW_STATS_DONT_CARE;
47
48 return fl_action;
49 }
50
51 #define FLOW_DISSECTOR_MATCH(__rule, __type, __out) \
52 const struct flow_match *__m = &(__rule)->match; \
53 struct flow_dissector *__d = (__m)->dissector; \
54 \
55 (__out)->key = skb_flow_dissector_target(__d, __type, (__m)->key); \
56 (__out)->mask = skb_flow_dissector_target(__d, __type, (__m)->mask); \
57
58 void flow_rule_match_meta(const struct flow_rule *rule,
59 struct flow_match_meta *out)
60 {
61 FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_META, out);
62 }
63 EXPORT_SYMBOL(flow_rule_match_meta);
64
65 void flow_rule_match_basic(const struct flow_rule *rule,
66 struct flow_match_basic *out)
67 {
68 FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_BASIC, out);
69 }
70 EXPORT_SYMBOL(flow_rule_match_basic);
71
72 void flow_rule_match_control(const struct flow_rule *rule,
73 struct flow_match_control *out)
74 {
75 FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_CONTROL, out);
76 }
77 EXPORT_SYMBOL(flow_rule_match_control);
78
79 void flow_rule_match_eth_addrs(const struct flow_rule *rule,
80 struct flow_match_eth_addrs *out)
81 {
82 FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_ETH_ADDRS, out);
83 }
84 EXPORT_SYMBOL(flow_rule_match_eth_addrs);
85
86 void flow_rule_match_vlan(const struct flow_rule *rule,
87 struct flow_match_vlan *out)
88 {
89 FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_VLAN, out);
90 }
91 EXPORT_SYMBOL(flow_rule_match_vlan);
92
93 void flow_rule_match_cvlan(const struct flow_rule *rule,
94 struct flow_match_vlan *out)
95 {
96 FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_CVLAN, out);
97 }
98 EXPORT_SYMBOL(flow_rule_match_cvlan);
99
100 void flow_rule_match_arp(const struct flow_rule *rule,
101 struct flow_match_arp *out)
102 {
103 FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_ARP, out);
104 }
105 EXPORT_SYMBOL(flow_rule_match_arp);
106
107 void flow_rule_match_ipv4_addrs(const struct flow_rule *rule,
108 struct flow_match_ipv4_addrs *out)
109 {
110 FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_IPV4_ADDRS, out);
111 }
112 EXPORT_SYMBOL(flow_rule_match_ipv4_addrs);
113
114 void flow_rule_match_ipv6_addrs(const struct flow_rule *rule,
115 struct flow_match_ipv6_addrs *out)
116 {
117 FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_IPV6_ADDRS, out);
118 }
119 EXPORT_SYMBOL(flow_rule_match_ipv6_addrs);
120
121 void flow_rule_match_ip(const struct flow_rule *rule,
122 struct flow_match_ip *out)
123 {
124 FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_IP, out);
125 }
126 EXPORT_SYMBOL(flow_rule_match_ip);
127
128 void flow_rule_match_ports(const struct flow_rule *rule,
129 struct flow_match_ports *out)
130 {
131 FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_PORTS, out);
132 }
133 EXPORT_SYMBOL(flow_rule_match_ports);
134
135 void flow_rule_match_ports_range(const struct flow_rule *rule,
136 struct flow_match_ports_range *out)
137 {
138 FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_PORTS_RANGE, out);
139 }
140 EXPORT_SYMBOL(flow_rule_match_ports_range);
141
142 void flow_rule_match_tcp(const struct flow_rule *rule,
143 struct flow_match_tcp *out)
144 {
145 FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_TCP, out);
146 }
147 EXPORT_SYMBOL(flow_rule_match_tcp);
148
149 void flow_rule_match_ipsec(const struct flow_rule *rule,
150 struct flow_match_ipsec *out)
151 {
152 FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_IPSEC, out);
153 }
154 EXPORT_SYMBOL(flow_rule_match_ipsec);
155
156 void flow_rule_match_icmp(const struct flow_rule *rule,
157 struct flow_match_icmp *out)
158 {
159 FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_ICMP, out);
160 }
161 EXPORT_SYMBOL(flow_rule_match_icmp);
162
163 void flow_rule_match_mpls(const struct flow_rule *rule,
164 struct flow_match_mpls *out)
165 {
166 FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_MPLS, out);
167 }
168 EXPORT_SYMBOL(flow_rule_match_mpls);
169
170 void flow_rule_match_enc_control(const struct flow_rule *rule,
171 struct flow_match_control *out)
172 {
173 FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_ENC_CONTROL, out);
174 }
175 EXPORT_SYMBOL(flow_rule_match_enc_control);
176
177 void flow_rule_match_enc_ipv4_addrs(const struct flow_rule *rule,
178 struct flow_match_ipv4_addrs *out)
179 {
180 FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_ENC_IPV4_ADDRS, out);
181 }
182 EXPORT_SYMBOL(flow_rule_match_enc_ipv4_addrs);
183
184 void flow_rule_match_enc_ipv6_addrs(const struct flow_rule *rule,
185 struct flow_match_ipv6_addrs *out)
186 {
187 FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_ENC_IPV6_ADDRS, out);
188 }
189 EXPORT_SYMBOL(flow_rule_match_enc_ipv6_addrs);
190
191 void flow_rule_match_enc_ip(const struct flow_rule *rule,
192 struct flow_match_ip *out)
193 {
194 FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_ENC_IP, out);
195 }
196 EXPORT_SYMBOL(flow_rule_match_enc_ip);
197
198 void flow_rule_match_enc_ports(const struct flow_rule *rule,
199 struct flow_match_ports *out)
200 {
201 FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_ENC_PORTS, out);
202 }
203 EXPORT_SYMBOL(flow_rule_match_enc_ports);
204
205 void flow_rule_match_enc_keyid(const struct flow_rule *rule,
206 struct flow_match_enc_keyid *out)
207 {
208 FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_ENC_KEYID, out);
209 }
210 EXPORT_SYMBOL(flow_rule_match_enc_keyid);
211
212 void flow_rule_match_enc_opts(const struct flow_rule *rule,
213 struct flow_match_enc_opts *out)
214 {
215 FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_ENC_OPTS, out);
216 }
217 EXPORT_SYMBOL(flow_rule_match_enc_opts);
218
219 struct flow_action_cookie *flow_action_cookie_create(void *data,
220 unsigned int len,
221 gfp_t gfp)
222 {
223 struct flow_action_cookie *cookie;
224
225 cookie = kmalloc(sizeof(*cookie) + len, gfp);
226 if (!cookie)
227 return NULL;
228 cookie->cookie_len = len;
229 memcpy(cookie->cookie, data, len);
230 return cookie;
231 }
232 EXPORT_SYMBOL(flow_action_cookie_create);
233
234 void flow_action_cookie_destroy(struct flow_action_cookie *cookie)
235 {
236 kfree(cookie);
237 }
238 EXPORT_SYMBOL(flow_action_cookie_destroy);
239
240 void flow_rule_match_ct(const struct flow_rule *rule,
241 struct flow_match_ct *out)
242 {
243 FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_CT, out);
244 }
245 EXPORT_SYMBOL(flow_rule_match_ct);
246
247 void flow_rule_match_pppoe(const struct flow_rule *rule,
248 struct flow_match_pppoe *out)
249 {
250 FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_PPPOE, out);
251 }
252 EXPORT_SYMBOL(flow_rule_match_pppoe);
253
254 void flow_rule_match_l2tpv3(const struct flow_rule *rule,
255 struct flow_match_l2tpv3 *out)
256 {
257 FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_L2TPV3, out);
258 }
259 EXPORT_SYMBOL(flow_rule_match_l2tpv3);
260
261 struct flow_block_cb *flow_block_cb_alloc(flow_setup_cb_t *cb,
262 void *cb_ident, void *cb_priv,
263 void (*release)(void *cb_priv))
264 {
265 struct flow_block_cb *block_cb;
266
267 block_cb = kzalloc(sizeof(*block_cb), GFP_KERNEL);
268 if (!block_cb)
269 return ERR_PTR(-ENOMEM);
270
271 block_cb->cb = cb;
272 block_cb->cb_ident = cb_ident;
273 block_cb->cb_priv = cb_priv;
274 block_cb->release = release;
275
276 return block_cb;
277 }
278 EXPORT_SYMBOL(flow_block_cb_alloc);
279
280 void flow_block_cb_free(struct flow_block_cb *block_cb)
281 {
282 if (block_cb->release)
283 block_cb->release(block_cb->cb_priv);
284
285 kfree(block_cb);
286 }
287 EXPORT_SYMBOL(flow_block_cb_free);
288
289 struct flow_block_cb *flow_block_cb_lookup(struct flow_block *block,
290 flow_setup_cb_t *cb, void *cb_ident)
291 {
292 struct flow_block_cb *block_cb;
293
294 list_for_each_entry(block_cb, &block->cb_list, list) {
295 if (block_cb->cb == cb &&
296 block_cb->cb_ident == cb_ident)
297 return block_cb;
298 }
299
300 return NULL;
301 }
302 EXPORT_SYMBOL(flow_block_cb_lookup);
303
304 void *flow_block_cb_priv(struct flow_block_cb *block_cb)
305 {
306 return block_cb->cb_priv;
307 }
308 EXPORT_SYMBOL(flow_block_cb_priv);
309
310 void flow_block_cb_incref(struct flow_block_cb *block_cb)
311 {
312 block_cb->refcnt++;
313 }
314 EXPORT_SYMBOL(flow_block_cb_incref);
315
316 unsigned int flow_block_cb_decref(struct flow_block_cb *block_cb)
317 {
318 return --block_cb->refcnt;
319 }
320 EXPORT_SYMBOL(flow_block_cb_decref);
321
322 bool flow_block_cb_is_busy(flow_setup_cb_t *cb, void *cb_ident,
323 struct list_head *driver_block_list)
324 {
325 struct flow_block_cb *block_cb;
326
327 list_for_each_entry(block_cb, driver_block_list, driver_list) {
328 if (block_cb->cb == cb &&
329 block_cb->cb_ident == cb_ident)
330 return true;
331 }
332
333 return false;
334 }
335 EXPORT_SYMBOL(flow_block_cb_is_busy);
336
337 int flow_block_cb_setup_simple(struct flow_block_offload *f,
338 struct list_head *driver_block_list,
339 flow_setup_cb_t *cb,
340 void *cb_ident, void *cb_priv,
341 bool ingress_only)
342 {
343 struct flow_block_cb *block_cb;
344
345 if (ingress_only &&
346 f->binder_type != FLOW_BLOCK_BINDER_TYPE_CLSACT_INGRESS)
347 return -EOPNOTSUPP;
348
349 f->driver_block_list = driver_block_list;
350
351 switch (f->command) {
352 case FLOW_BLOCK_BIND:
353 if (flow_block_cb_is_busy(cb, cb_ident, driver_block_list))
354 return -EBUSY;
355
356 block_cb = flow_block_cb_alloc(cb, cb_ident, cb_priv, NULL);
357 if (IS_ERR(block_cb))
358 return PTR_ERR(block_cb);
359
360 flow_block_cb_add(block_cb, f);
361 list_add_tail(&block_cb->driver_list, driver_block_list);
362 return 0;
363 case FLOW_BLOCK_UNBIND:
364 block_cb = flow_block_cb_lookup(f->block, cb, cb_ident);
365 if (!block_cb)
366 return -ENOENT;
367
368 flow_block_cb_remove(block_cb, f);
369 list_del(&block_cb->driver_list);
370 return 0;
371 default:
372 return -EOPNOTSUPP;
373 }
374 }
375 EXPORT_SYMBOL(flow_block_cb_setup_simple);
376
377 static DEFINE_MUTEX(flow_indr_block_lock);
378 static LIST_HEAD(flow_block_indr_list);
379 static LIST_HEAD(flow_block_indr_dev_list);
380 static LIST_HEAD(flow_indir_dev_list);
381
382 struct flow_indr_dev {
383 struct list_head list;
384 flow_indr_block_bind_cb_t *cb;
385 void *cb_priv;
386 refcount_t refcnt;
387 };
388
389 static struct flow_indr_dev *flow_indr_dev_alloc(flow_indr_block_bind_cb_t *cb,
390 void *cb_priv)
391 {
392 struct flow_indr_dev *indr_dev;
393
394 indr_dev = kmalloc(sizeof(*indr_dev), GFP_KERNEL);
395 if (!indr_dev)
396 return NULL;
397
398 indr_dev->cb = cb;
399 indr_dev->cb_priv = cb_priv;
400 refcount_set(&indr_dev->refcnt, 1);
401
402 return indr_dev;
403 }
404
405 struct flow_indir_dev_info {
406 void *data;
407 struct net_device *dev;
408 struct Qdisc *sch;
409 enum tc_setup_type type;
410 void (*cleanup)(struct flow_block_cb *block_cb);
411 struct list_head list;
412 enum flow_block_command command;
413 enum flow_block_binder_type binder_type;
414 struct list_head *cb_list;
415 };
416
417 static void existing_qdiscs_register(flow_indr_block_bind_cb_t *cb, void *cb_priv)
418 {
419 struct flow_block_offload bo;
420 struct flow_indir_dev_info *cur;
421
422 list_for_each_entry(cur, &flow_indir_dev_list, list) {
423 memset(&bo, 0, sizeof(bo));
424 bo.command = cur->command;
425 bo.binder_type = cur->binder_type;
426 INIT_LIST_HEAD(&bo.cb_list);
427 cb(cur->dev, cur->sch, cb_priv, cur->type, &bo, cur->data, cur->cleanup);
428 list_splice(&bo.cb_list, cur->cb_list);
429 }
430 }
431
432 int flow_indr_dev_register(flow_indr_block_bind_cb_t *cb, void *cb_priv)
433 {
434 struct flow_indr_dev *indr_dev;
435
436 mutex_lock(&flow_indr_block_lock);
437 list_for_each_entry(indr_dev, &flow_block_indr_dev_list, list) {
438 if (indr_dev->cb == cb &&
439 indr_dev->cb_priv == cb_priv) {
440 refcount_inc(&indr_dev->refcnt);
441 mutex_unlock(&flow_indr_block_lock);
442 return 0;
443 }
444 }
445
446 indr_dev = flow_indr_dev_alloc(cb, cb_priv);
447 if (!indr_dev) {
448 mutex_unlock(&flow_indr_block_lock);
449 return -ENOMEM;
450 }
451
452 list_add(&indr_dev->list, &flow_block_indr_dev_list);
453 existing_qdiscs_register(cb, cb_priv);
454 mutex_unlock(&flow_indr_block_lock);
455
456 tcf_action_reoffload_cb(cb, cb_priv, true);
457
458 return 0;
459 }
460 EXPORT_SYMBOL(flow_indr_dev_register);
461
462 static void __flow_block_indr_cleanup(void (*release)(void *cb_priv),
463 void *cb_priv,
464 struct list_head *cleanup_list)
465 {
466 struct flow_block_cb *this, *next;
467
468 list_for_each_entry_safe(this, next, &flow_block_indr_list, indr.list) {
469 if (this->release == release &&
470 this->indr.cb_priv == cb_priv)
471 list_move(&this->indr.list, cleanup_list);
472 }
473 }
474
475 static void flow_block_indr_notify(struct list_head *cleanup_list)
476 {
477 struct flow_block_cb *this, *next;
478
479 list_for_each_entry_safe(this, next, cleanup_list, indr.list) {
480 list_del(&this->indr.list);
481 this->indr.cleanup(this);
482 }
483 }
484
485 void flow_indr_dev_unregister(flow_indr_block_bind_cb_t *cb, void *cb_priv,
486 void (*release)(void *cb_priv))
487 {
488 struct flow_indr_dev *this, *next, *indr_dev = NULL;
489 LIST_HEAD(cleanup_list);
490
491 mutex_lock(&flow_indr_block_lock);
492 list_for_each_entry_safe(this, next, &flow_block_indr_dev_list, list) {
493 if (this->cb == cb &&
494 this->cb_priv == cb_priv &&
495 refcount_dec_and_test(&this->refcnt)) {
496 indr_dev = this;
497 list_del(&indr_dev->list);
498 break;
499 }
500 }
501
502 if (!indr_dev) {
503 mutex_unlock(&flow_indr_block_lock);
504 return;
505 }
506
507 __flow_block_indr_cleanup(release, cb_priv, &cleanup_list);
508 mutex_unlock(&flow_indr_block_lock);
509
510 tcf_action_reoffload_cb(cb, cb_priv, false);
511 flow_block_indr_notify(&cleanup_list);
512 kfree(indr_dev);
513 }
514 EXPORT_SYMBOL(flow_indr_dev_unregister);
515
516 static void flow_block_indr_init(struct flow_block_cb *flow_block,
517 struct flow_block_offload *bo,
518 struct net_device *dev, struct Qdisc *sch, void *data,
519 void *cb_priv,
520 void (*cleanup)(struct flow_block_cb *block_cb))
521 {
522 flow_block->indr.binder_type = bo->binder_type;
523 flow_block->indr.data = data;
524 flow_block->indr.cb_priv = cb_priv;
525 flow_block->indr.dev = dev;
526 flow_block->indr.sch = sch;
527 flow_block->indr.cleanup = cleanup;
528 }
529
530 struct flow_block_cb *flow_indr_block_cb_alloc(flow_setup_cb_t *cb,
531 void *cb_ident, void *cb_priv,
532 void (*release)(void *cb_priv),
533 struct flow_block_offload *bo,
534 struct net_device *dev,
535 struct Qdisc *sch, void *data,
536 void *indr_cb_priv,
537 void (*cleanup)(struct flow_block_cb *block_cb))
538 {
539 struct flow_block_cb *block_cb;
540
541 block_cb = flow_block_cb_alloc(cb, cb_ident, cb_priv, release);
542 if (IS_ERR(block_cb))
543 goto out;
544
545 flow_block_indr_init(block_cb, bo, dev, sch, data, indr_cb_priv, cleanup);
546 list_add(&block_cb->indr.list, &flow_block_indr_list);
547
548 out:
549 return block_cb;
550 }
551 EXPORT_SYMBOL(flow_indr_block_cb_alloc);
552
553 static struct flow_indir_dev_info *find_indir_dev(void *data)
554 {
555 struct flow_indir_dev_info *cur;
556
557 list_for_each_entry(cur, &flow_indir_dev_list, list) {
558 if (cur->data == data)
559 return cur;
560 }
561 return NULL;
562 }
563
564 static int indir_dev_add(void *data, struct net_device *dev, struct Qdisc *sch,
565 enum tc_setup_type type, void (*cleanup)(struct flow_block_cb *block_cb),
566 struct flow_block_offload *bo)
567 {
568 struct flow_indir_dev_info *info;
569
570 info = find_indir_dev(data);
571 if (info)
572 return -EEXIST;
573
574 info = kzalloc(sizeof(*info), GFP_KERNEL);
575 if (!info)
576 return -ENOMEM;
577
578 info->data = data;
579 info->dev = dev;
580 info->sch = sch;
581 info->type = type;
582 info->cleanup = cleanup;
583 info->command = bo->command;
584 info->binder_type = bo->binder_type;
585 info->cb_list = bo->cb_list_head;
586
587 list_add(&info->list, &flow_indir_dev_list);
588 return 0;
589 }
590
591 static int indir_dev_remove(void *data)
592 {
593 struct flow_indir_dev_info *info;
594
595 info = find_indir_dev(data);
596 if (!info)
597 return -ENOENT;
598
599 list_del(&info->list);
600
601 kfree(info);
602 return 0;
603 }
604
605 int flow_indr_dev_setup_offload(struct net_device *dev, struct Qdisc *sch,
606 enum tc_setup_type type, void *data,
607 struct flow_block_offload *bo,
608 void (*cleanup)(struct flow_block_cb *block_cb))
609 {
610 struct flow_indr_dev *this;
611 u32 count = 0;
612 int err;
613
614 mutex_lock(&flow_indr_block_lock);
615 if (bo) {
616 if (bo->command == FLOW_BLOCK_BIND)
617 indir_dev_add(data, dev, sch, type, cleanup, bo);
618 else if (bo->command == FLOW_BLOCK_UNBIND)
619 indir_dev_remove(data);
620 }
621
622 list_for_each_entry(this, &flow_block_indr_dev_list, list) {
623 err = this->cb(dev, sch, this->cb_priv, type, bo, data, cleanup);
624 if (!err)
625 count++;
626 }
627
628 mutex_unlock(&flow_indr_block_lock);
629
630 return (bo && list_empty(&bo->cb_list)) ? -EOPNOTSUPP : count;
631 }
632 EXPORT_SYMBOL(flow_indr_dev_setup_offload);
633
634 bool flow_indr_dev_exists(void)
635 {
636 return !list_empty(&flow_block_indr_dev_list);
637 }
638 EXPORT_SYMBOL(flow_indr_dev_exists);
639
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