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
10struct 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}
29EXPORT_SYMBOL(flow_rule_alloc);
30
31struct 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
58void 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}
63EXPORT_SYMBOL(flow_rule_match_meta);
64
65void 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}
70EXPORT_SYMBOL(flow_rule_match_basic);
71
72void 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}
77EXPORT_SYMBOL(flow_rule_match_control);
78
79void 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}
84EXPORT_SYMBOL(flow_rule_match_eth_addrs);
85
86void 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}
91EXPORT_SYMBOL(flow_rule_match_vlan);
92
93void 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}
98EXPORT_SYMBOL(flow_rule_match_cvlan);
99
100void 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}
105EXPORT_SYMBOL(flow_rule_match_arp);
106
107void 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}
112EXPORT_SYMBOL(flow_rule_match_ipv4_addrs);
113
114void 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}
119EXPORT_SYMBOL(flow_rule_match_ipv6_addrs);
120
121void 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}
126EXPORT_SYMBOL(flow_rule_match_ip);
127
128void 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}
133EXPORT_SYMBOL(flow_rule_match_ports);
134
135void 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}
140EXPORT_SYMBOL(flow_rule_match_ports_range);
141
142void 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}
147EXPORT_SYMBOL(flow_rule_match_tcp);
148
149void 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}
154EXPORT_SYMBOL(flow_rule_match_ipsec);
155
156void 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}
161EXPORT_SYMBOL(flow_rule_match_icmp);
162
163void 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}
168EXPORT_SYMBOL(flow_rule_match_mpls);
169
170void 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}
175EXPORT_SYMBOL(flow_rule_match_enc_control);
176
177void 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}
182EXPORT_SYMBOL(flow_rule_match_enc_ipv4_addrs);
183
184void 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}
189EXPORT_SYMBOL(flow_rule_match_enc_ipv6_addrs);
190
191void 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}
196EXPORT_SYMBOL(flow_rule_match_enc_ip);
197
198void 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}
203EXPORT_SYMBOL(flow_rule_match_enc_ports);
204
205void 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}
210EXPORT_SYMBOL(flow_rule_match_enc_keyid);
211
212void 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}
217EXPORT_SYMBOL(flow_rule_match_enc_opts);
218
219struct 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(to: cookie->cookie, from: data, len);
230 return cookie;
231}
232EXPORT_SYMBOL(flow_action_cookie_create);
233
234void flow_action_cookie_destroy(struct flow_action_cookie *cookie)
235{
236 kfree(objp: cookie);
237}
238EXPORT_SYMBOL(flow_action_cookie_destroy);
239
240void 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}
245EXPORT_SYMBOL(flow_rule_match_ct);
246
247void 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}
252EXPORT_SYMBOL(flow_rule_match_pppoe);
253
254void 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}
259EXPORT_SYMBOL(flow_rule_match_l2tpv3);
260
261struct 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(error: -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}
278EXPORT_SYMBOL(flow_block_cb_alloc);
279
280void 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(objp: block_cb);
286}
287EXPORT_SYMBOL(flow_block_cb_free);
288
289struct 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}
302EXPORT_SYMBOL(flow_block_cb_lookup);
303
304void *flow_block_cb_priv(struct flow_block_cb *block_cb)
305{
306 return block_cb->cb_priv;
307}
308EXPORT_SYMBOL(flow_block_cb_priv);
309
310void flow_block_cb_incref(struct flow_block_cb *block_cb)
311{
312 block_cb->refcnt++;
313}
314EXPORT_SYMBOL(flow_block_cb_incref);
315
316unsigned int flow_block_cb_decref(struct flow_block_cb *block_cb)
317{
318 return --block_cb->refcnt;
319}
320EXPORT_SYMBOL(flow_block_cb_decref);
321
322bool 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}
335EXPORT_SYMBOL(flow_block_cb_is_busy);
336
337int 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(ptr: block_cb))
358 return PTR_ERR(ptr: block_cb);
359
360 flow_block_cb_add(block_cb, offload: f);
361 list_add_tail(new: &block_cb->driver_list, head: 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, offload: f);
369 list_del(entry: &block_cb->driver_list);
370 return 0;
371 default:
372 return -EOPNOTSUPP;
373 }
374}
375EXPORT_SYMBOL(flow_block_cb_setup_simple);
376
377static DEFINE_MUTEX(flow_indr_block_lock);
378static LIST_HEAD(flow_block_indr_list);
379static LIST_HEAD(flow_block_indr_dev_list);
380static LIST_HEAD(flow_indir_dev_list);
381
382struct 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
389static 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(r: &indr_dev->refcnt, n: 1);
401
402 return indr_dev;
403}
404
405struct 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
417static 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(s: &bo, c: 0, n: sizeof(bo));
424 bo.command = cur->command;
425 bo.binder_type = cur->binder_type;
426 INIT_LIST_HEAD(list: &bo.cb_list);
427 cb(cur->dev, cur->sch, cb_priv, cur->type, &bo, cur->data, cur->cleanup);
428 list_splice(list: &bo.cb_list, head: cur->cb_list);
429 }
430}
431
432int 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(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(r: &indr_dev->refcnt);
441 mutex_unlock(lock: &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(lock: &flow_indr_block_lock);
449 return -ENOMEM;
450 }
451
452 list_add(new: &indr_dev->list, head: &flow_block_indr_dev_list);
453 existing_qdiscs_register(cb, cb_priv);
454 mutex_unlock(lock: &flow_indr_block_lock);
455
456 tcf_action_reoffload_cb(cb, cb_priv, add: true);
457
458 return 0;
459}
460EXPORT_SYMBOL(flow_indr_dev_register);
461
462static 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(list: &this->indr.list, head: cleanup_list);
472 }
473}
474
475static 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(entry: &this->indr.list);
481 this->indr.cleanup(this);
482 }
483}
484
485void 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(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(r: &this->refcnt)) {
496 indr_dev = this;
497 list_del(entry: &indr_dev->list);
498 break;
499 }
500 }
501
502 if (!indr_dev) {
503 mutex_unlock(lock: &flow_indr_block_lock);
504 return;
505 }
506
507 __flow_block_indr_cleanup(release, cb_priv, cleanup_list: &cleanup_list);
508 mutex_unlock(lock: &flow_indr_block_lock);
509
510 tcf_action_reoffload_cb(cb, cb_priv, add: false);
511 flow_block_indr_notify(cleanup_list: &cleanup_list);
512 kfree(objp: indr_dev);
513}
514EXPORT_SYMBOL(flow_indr_dev_unregister);
515
516static 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
530struct 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(ptr: block_cb))
543 goto out;
544
545 flow_block_indr_init(flow_block: block_cb, bo, dev, sch, data, cb_priv: indr_cb_priv, cleanup);
546 list_add(new: &block_cb->indr.list, head: &flow_block_indr_list);
547
548out:
549 return block_cb;
550}
551EXPORT_SYMBOL(flow_indr_block_cb_alloc);
552
553static 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
564static 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(new: &info->list, head: &flow_indir_dev_list);
588 return 0;
589}
590
591static 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(entry: &info->list);
600
601 kfree(objp: info);
602 return 0;
603}
604
605int 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(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(lock: &flow_indr_block_lock);
629
630 return (bo && list_empty(head: &bo->cb_list)) ? -EOPNOTSUPP : count;
631}
632EXPORT_SYMBOL(flow_indr_dev_setup_offload);
633
634bool flow_indr_dev_exists(void)
635{
636 return !list_empty(head: &flow_block_indr_dev_list);
637}
638EXPORT_SYMBOL(flow_indr_dev_exists);
639