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