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Merge tag 'dt-for-palmer-v6.1-mw1' of git://git.kernel.org/pub/scm/linux/kernel/git...
[linux-block.git] / net / sched / cls_api.c
CommitLineData
2874c5fd 1// SPDX-License-Identifier: GPL-2.0-or-later
1da177e4
LT		 2/*
3 * net/sched/cls_api.c Packet classifier API.
4 *
1da177e4
LT		 5 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
6 *
7 * Changes:
8 *
9 * Eduardo J. Blanco <ejbs@netlabs.com.uy> :990222: kmod support
1da177e4
LT		 10 */
11
1da177e4
LT		 12#include <linux/module.h>
13#include <linux/types.h>
14#include <linux/kernel.h>
1da177e4 15#include <linux/string.h>
1da177e4 16#include <linux/errno.h>
33a48927 17#include <linux/err.h>
1da177e4 18#include <linux/skbuff.h>
1da177e4
LT		 19#include <linux/init.h>
20#include <linux/kmod.h>
5a0e3ad6 21#include <linux/slab.h>
48617387 22#include <linux/idr.h>
59eb87cb 23#include <linux/jhash.h>
43719298 24#include <linux/rculist.h>
b854272b
DL		 25#include <net/net_namespace.h>
26#include <net/sock.h>
dc5fc579 27#include <net/netlink.h>
1da177e4
LT		 28#include <net/pkt_sched.h>
29#include <net/pkt_cls.h>
e3ab786b 30#include <net/tc_act/tc_pedit.h>
3a7b6861
PNA		 31#include <net/tc_act/tc_mirred.h>
32#include <net/tc_act/tc_vlan.h>
33#include <net/tc_act/tc_tunnel_key.h>
34#include <net/tc_act/tc_csum.h>
35#include <net/tc_act/tc_gact.h>
8c8cfc6e 36#include <net/tc_act/tc_police.h>
a7a7be60 37#include <net/tc_act/tc_sample.h>
3a7b6861 38#include <net/tc_act/tc_skbedit.h>
b57dc7c1 39#include <net/tc_act/tc_ct.h>
6749d590 40#include <net/tc_act/tc_mpls.h>
d29bdd69 41#include <net/tc_act/tc_gate.h>
4e481908 42#include <net/flow_offload.h>
1da177e4 43
e331473f
DC		 44extern const struct nla_policy rtm_tca_policy[TCA_MAX + 1];
45
1da177e4 46/* The list of all installed classifier types */
36272874 47static LIST_HEAD(tcf_proto_base);
1da177e4
LT		 48
49/* Protects list of registered TC modules. It is pure SMP lock. */
50static DEFINE_RWLOCK(cls_mod_lock);
51
35d39fec
PB		 52#ifdef CONFIG_NET_CLS_ACT
53DEFINE_STATIC_KEY_FALSE(tc_skb_ext_tc);
54EXPORT_SYMBOL(tc_skb_ext_tc);
55
56void tc_skb_ext_tc_enable(void)
57{
58 static_branch_inc(&tc_skb_ext_tc);
59}
60EXPORT_SYMBOL(tc_skb_ext_tc_enable);
61
62void tc_skb_ext_tc_disable(void)
63{
64 static_branch_dec(&tc_skb_ext_tc);
65}
66EXPORT_SYMBOL(tc_skb_ext_tc_disable);
67#endif
68
59eb87cb
JH		 69static u32 destroy_obj_hashfn(const struct tcf_proto *tp)
70{
71 return jhash_3words(tp->chain->index, tp->prio,
72 (__force __u32)tp->protocol, 0);
73}
74
75static void tcf_proto_signal_destroying(struct tcf_chain *chain,
76 struct tcf_proto *tp)
77{
78 struct tcf_block *block = chain->block;
79
80 mutex_lock(&block->proto_destroy_lock);
81 hash_add_rcu(block->proto_destroy_ht, &tp->destroy_ht_node,
82 destroy_obj_hashfn(tp));
83 mutex_unlock(&block->proto_destroy_lock);
84}
85
86static bool tcf_proto_cmp(const struct tcf_proto *tp1,
87 const struct tcf_proto *tp2)
88{
89 return tp1->chain->index == tp2->chain->index &&
90 tp1->prio == tp2->prio &&
91 tp1->protocol == tp2->protocol;
92}
93
94static bool tcf_proto_exists_destroying(struct tcf_chain *chain,
95 struct tcf_proto *tp)
96{
97 u32 hash = destroy_obj_hashfn(tp);
98 struct tcf_proto *iter;
99 bool found = false;
100
101 rcu_read_lock();
102 hash_for_each_possible_rcu(chain->block->proto_destroy_ht, iter,
103 destroy_ht_node, hash) {
104 if (tcf_proto_cmp(tp, iter)) {
105 found = true;
106 break;
107 }
108 }
109 rcu_read_unlock();
110
111 return found;
112}
113
114static void
115tcf_proto_signal_destroyed(struct tcf_chain *chain, struct tcf_proto *tp)
116{
117 struct tcf_block *block = chain->block;
118
119 mutex_lock(&block->proto_destroy_lock);
120 if (hash_hashed(&tp->destroy_ht_node))
121 hash_del_rcu(&tp->destroy_ht_node);
122 mutex_unlock(&block->proto_destroy_lock);
123}
124
1da177e4
LT		 125/* Find classifier type by string name */
126
f34e8bff 127static const struct tcf_proto_ops *__tcf_proto_lookup_ops(const char *kind)
1da177e4 128{
dcd76081 129 const struct tcf_proto_ops *t, *res = NULL;
1da177e4
LT		 130
131 if (kind) {
132 read_lock(&cls_mod_lock);
36272874 133 list_for_each_entry(t, &tcf_proto_base, head) {
33a48927 134 if (strcmp(kind, t->kind) == 0) {
dcd76081
ED		 135 if (try_module_get(t->owner))
136 res = t;
1da177e4
LT		 137 break;
138 }
139 }
140 read_unlock(&cls_mod_lock);
141 }
dcd76081 142 return res;
1da177e4
LT		 143}
144
f34e8bff 145static const struct tcf_proto_ops *
12db03b6
VB		 146tcf_proto_lookup_ops(const char *kind, bool rtnl_held,
147 struct netlink_ext_ack *extack)
f34e8bff
JP		 148{
149 const struct tcf_proto_ops *ops;
150
151 ops = __tcf_proto_lookup_ops(kind);
152 if (ops)
153 return ops;
154#ifdef CONFIG_MODULES
12db03b6
VB		 155 if (rtnl_held)
156 rtnl_unlock();
f34e8bff 157 request_module("cls_%s", kind);
12db03b6
VB		 158 if (rtnl_held)
159 rtnl_lock();
f34e8bff
JP		 160 ops = __tcf_proto_lookup_ops(kind);
161 /* We dropped the RTNL semaphore in order to perform
162 * the module load. So, even if we succeeded in loading
163 * the module we have to replay the request. We indicate
164 * this using -EAGAIN.
165 */
166 if (ops) {
167 module_put(ops->owner);
168 return ERR_PTR(-EAGAIN);
169 }
170#endif
171 NL_SET_ERR_MSG(extack, "TC classifier not found");
172 return ERR_PTR(-ENOENT);
173}
174
1da177e4
LT		 175/* Register(unregister) new classifier type */
176
177int register_tcf_proto_ops(struct tcf_proto_ops *ops)
178{
36272874 179 struct tcf_proto_ops *t;
1da177e4
LT		 180 int rc = -EEXIST;
181
182 write_lock(&cls_mod_lock);
36272874 183 list_for_each_entry(t, &tcf_proto_base, head)
1da177e4
LT		 184 if (!strcmp(ops->kind, t->kind))
185 goto out;
186
36272874 187 list_add_tail(&ops->head, &tcf_proto_base);
1da177e4
LT		 188 rc = 0;
189out:
190 write_unlock(&cls_mod_lock);
191 return rc;
192}
aa767bfe 193EXPORT_SYMBOL(register_tcf_proto_ops);
1da177e4 194
7aa0045d
CW		 195static struct workqueue_struct *tc_filter_wq;
196
bc5c8260 197void unregister_tcf_proto_ops(struct tcf_proto_ops *ops)
1da177e4 198{
36272874 199 struct tcf_proto_ops *t;
1da177e4
LT		 200 int rc = -ENOENT;
201
c78e1746
DB		 202 /* Wait for outstanding call_rcu()s, if any, from a
203 * tcf_proto_ops's destroy() handler.
204 */
205 rcu_barrier();
7aa0045d 206 flush_workqueue(tc_filter_wq);
c78e1746 207
1da177e4 208 write_lock(&cls_mod_lock);
dcd76081
ED		 209 list_for_each_entry(t, &tcf_proto_base, head) {
210 if (t == ops) {
211 list_del(&t->head);
212 rc = 0;
1da177e4 213 break;
dcd76081
ED		 214 }
215 }
1da177e4 216 write_unlock(&cls_mod_lock);
bc5c8260
ZS		 217
218 WARN(rc, "unregister tc filter kind(%s) failed %d\n", ops->kind, rc);
1da177e4 219}
aa767bfe 220EXPORT_SYMBOL(unregister_tcf_proto_ops);
1da177e4 221
aaa908ff 222bool tcf_queue_work(struct rcu_work *rwork, work_func_t func)
7aa0045d 223{
aaa908ff
CW		 224 INIT_RCU_WORK(rwork, func);
225 return queue_rcu_work(tc_filter_wq, rwork);
7aa0045d
CW		 226}
227EXPORT_SYMBOL(tcf_queue_work);
228
1da177e4
LT		 229/* Select new prio value from the range, managed by kernel. */
230
aa767bfe 231static inline u32 tcf_auto_prio(struct tcf_proto *tp)
1da177e4 232{
aa767bfe 233 u32 first = TC_H_MAKE(0xC0000000U, 0U);
1da177e4
LT		 234
235 if (tp)
cc7ec456 236 first = tp->prio - 1;
1da177e4 237
7961973a 238 return TC_H_MAJ(first);
1da177e4
LT		 239}
240
6f96c3c6
CW		 241static bool tcf_proto_check_kind(struct nlattr *kind, char *name)
242{
243 if (kind)
872f6903 244 return nla_strscpy(name, kind, IFNAMSIZ) < 0;
6f96c3c6
CW		 245 memset(name, 0, IFNAMSIZ);
246 return false;
247}
248
470502de
VB		 249static bool tcf_proto_is_unlocked(const char *kind)
250{
251 const struct tcf_proto_ops *ops;
252 bool ret;
253
6f96c3c6
CW		 254 if (strlen(kind) == 0)
255 return false;
256
470502de
VB		 257 ops = tcf_proto_lookup_ops(kind, false, NULL);
258 /* On error return false to take rtnl lock. Proto lookup/create
259 * functions will perform lookup again and properly handle errors.
260 */
261 if (IS_ERR(ops))
262 return false;
263
264 ret = !!(ops->flags & TCF_PROTO_OPS_DOIT_UNLOCKED);
265 module_put(ops->owner);
266 return ret;
267}
268
33a48927 269static struct tcf_proto *tcf_proto_create(const char *kind, u32 protocol,
c35a4acc 270 u32 prio, struct tcf_chain *chain,
12db03b6 271 bool rtnl_held,
c35a4acc 272 struct netlink_ext_ack *extack)
33a48927
JP		 273{
274 struct tcf_proto *tp;
275 int err;
276
277 tp = kzalloc(sizeof(*tp), GFP_KERNEL);
278 if (!tp)
279 return ERR_PTR(-ENOBUFS);
280
12db03b6 281 tp->ops = tcf_proto_lookup_ops(kind, rtnl_held, extack);
f34e8bff
JP		 282 if (IS_ERR(tp->ops)) {
283 err = PTR_ERR(tp->ops);
d68d75fd 284 goto errout;
33a48927
JP		 285 }
286 tp->classify = tp->ops->classify;
287 tp->protocol = protocol;
288 tp->prio = prio;
5bc17018 289 tp->chain = chain;
8b64678e 290 spin_lock_init(&tp->lock);
4dbfa766 291 refcount_set(&tp->refcnt, 1);
33a48927
JP		 292
293 err = tp->ops->init(tp);
294 if (err) {
295 module_put(tp->ops->owner);
296 goto errout;
297 }
298 return tp;
299
300errout:
301 kfree(tp);
302 return ERR_PTR(err);
303}
304
4dbfa766
VB		 305static void tcf_proto_get(struct tcf_proto *tp)
306{
307 refcount_inc(&tp->refcnt);
308}
309
310static void tcf_chain_put(struct tcf_chain *chain);
311
12db03b6 312static void tcf_proto_destroy(struct tcf_proto *tp, bool rtnl_held,
59eb87cb 313 bool sig_destroy, struct netlink_ext_ack *extack)
cf1facda 314{
12db03b6 315 tp->ops->destroy(tp, rtnl_held, extack);
59eb87cb
JH		 316 if (sig_destroy)
317 tcf_proto_signal_destroyed(tp->chain, tp);
4dbfa766 318 tcf_chain_put(tp->chain);
763dbf63
WC		 319 module_put(tp->ops->owner);
320 kfree_rcu(tp, rcu);
cf1facda
JP		 321}
322
12db03b6 323static void tcf_proto_put(struct tcf_proto *tp, bool rtnl_held,
4dbfa766
VB		 324 struct netlink_ext_ack *extack)
325{
326 if (refcount_dec_and_test(&tp->refcnt))
59eb87cb 327 tcf_proto_destroy(tp, rtnl_held, true, extack);
4dbfa766
VB		 328}
329
a5b72a08 330static bool tcf_proto_check_delete(struct tcf_proto *tp)
8b64678e 331{
a5b72a08
DC		 332 if (tp->ops->delete_empty)
333 return tp->ops->delete_empty(tp);
8b64678e 334
a5b72a08 335 tp->deleting = true;
8b64678e
VB		 336 return tp->deleting;
337}
338
339static void tcf_proto_mark_delete(struct tcf_proto *tp)
340{
341 spin_lock(&tp->lock);
342 tp->deleting = true;
343 spin_unlock(&tp->lock);
344}
345
346static bool tcf_proto_is_deleting(struct tcf_proto *tp)
347{
348 bool deleting;
349
350 spin_lock(&tp->lock);
351 deleting = tp->deleting;
352 spin_unlock(&tp->lock);
353
354 return deleting;
355}
356
c266f64d
VB		 357#define ASSERT_BLOCK_LOCKED(block) \
358 lockdep_assert_held(&(block)->lock)
359
a9b19443
JP		 360struct tcf_filter_chain_list_item {
361 struct list_head list;
362 tcf_chain_head_change_t *chain_head_change;
363 void *chain_head_change_priv;
364};
365
5bc17018
JP		 366static struct tcf_chain *tcf_chain_create(struct tcf_block *block,
367 u32 chain_index)
2190d1d0 368{
5bc17018
JP		 369 struct tcf_chain *chain;
370
c266f64d
VB		 371 ASSERT_BLOCK_LOCKED(block);
372
5bc17018
JP		 373 chain = kzalloc(sizeof(*chain), GFP_KERNEL);
374 if (!chain)
375 return NULL;
43719298 376 list_add_tail_rcu(&chain->list, &block->chain_list);
ed76f5ed 377 mutex_init(&chain->filter_chain_lock);
5bc17018
JP		 378 chain->block = block;
379 chain->index = chain_index;
e2ef7544 380 chain->refcnt = 1;
f71e0ca4
JP		 381 if (!chain->index)
382 block->chain0.chain = chain;
5bc17018 383 return chain;
2190d1d0
JP		 384}
385
a9b19443
JP		 386static void tcf_chain_head_change_item(struct tcf_filter_chain_list_item *item,
387 struct tcf_proto *tp_head)
388{
389 if (item->chain_head_change)
390 item->chain_head_change(tp_head, item->chain_head_change_priv);
391}
f71e0ca4
JP		 392
393static void tcf_chain0_head_change(struct tcf_chain *chain,
394 struct tcf_proto *tp_head)
c7eb7d72 395{
a9b19443 396 struct tcf_filter_chain_list_item *item;
f71e0ca4 397 struct tcf_block *block = chain->block;
a9b19443 398
f71e0ca4
JP		 399 if (chain->index)
400 return;
165f0135
VB		 401
402 mutex_lock(&block->lock);
f71e0ca4 403 list_for_each_entry(item, &block->chain0.filter_chain_list, list)
a9b19443 404 tcf_chain_head_change_item(item, tp_head);
165f0135 405 mutex_unlock(&block->lock);
c7eb7d72
JP		 406}
407
c266f64d
VB		 408/* Returns true if block can be safely freed. */
409
410static bool tcf_chain_detach(struct tcf_chain *chain)
f93e1cdc 411{
efbf7897
CW		 412 struct tcf_block *block = chain->block;
413
c266f64d
VB		 414 ASSERT_BLOCK_LOCKED(block);
415
43719298 416 list_del_rcu(&chain->list);
f71e0ca4
JP		 417 if (!chain->index)
418 block->chain0.chain = NULL;
c266f64d
VB		 419
420 if (list_empty(&block->chain_list) &&
421 refcount_read(&block->refcnt) == 0)
422 return true;
423
424 return false;
425}
426
427static void tcf_block_destroy(struct tcf_block *block)
428{
429 mutex_destroy(&block->lock);
59eb87cb 430 mutex_destroy(&block->proto_destroy_lock);
c266f64d
VB		 431 kfree_rcu(block, rcu);
432}
433
434static void tcf_chain_destroy(struct tcf_chain *chain, bool free_block)
435{
436 struct tcf_block *block = chain->block;
437
ed76f5ed 438 mutex_destroy(&chain->filter_chain_lock);
ee3bbfe8 439 kfree_rcu(chain, rcu);
c266f64d
VB		 440 if (free_block)
441 tcf_block_destroy(block);
e2ef7544 442}
744a4cf6 443
e2ef7544
CW		 444static void tcf_chain_hold(struct tcf_chain *chain)
445{
c266f64d
VB		 446 ASSERT_BLOCK_LOCKED(chain->block);
447
e2ef7544 448 ++chain->refcnt;
2190d1d0
JP		 449}
450
3d32f4c5 451static bool tcf_chain_held_by_acts_only(struct tcf_chain *chain)
1f3ed383 452{
c266f64d
VB		 453 ASSERT_BLOCK_LOCKED(chain->block);
454
1f3ed383 455 /* In case all the references are action references, this
3d32f4c5 456 * chain should not be shown to the user.
1f3ed383
JP		 457 */
458 return chain->refcnt == chain->action_refcnt;
459}
460
32a4f5ec
JP		 461static struct tcf_chain *tcf_chain_lookup(struct tcf_block *block,
462 u32 chain_index)
5bc17018
JP		 463{
464 struct tcf_chain *chain;
465
c266f64d
VB		 466 ASSERT_BLOCK_LOCKED(block);
467
5bc17018 468 list_for_each_entry(chain, &block->chain_list, list) {
32a4f5ec 469 if (chain->index == chain_index)
e2ef7544 470 return chain;
32a4f5ec
JP		 471 }
472 return NULL;
473}
474
af699626
PB		 475#if IS_ENABLED(CONFIG_NET_TC_SKB_EXT)
476static struct tcf_chain *tcf_chain_lookup_rcu(const struct tcf_block *block,
477 u32 chain_index)
478{
479 struct tcf_chain *chain;
480
481 list_for_each_entry_rcu(chain, &block->chain_list, list) {
482 if (chain->index == chain_index)
483 return chain;
484 }
485 return NULL;
486}
487#endif
488
32a4f5ec
JP		 489static int tc_chain_notify(struct tcf_chain *chain, struct sk_buff *oskb,
490 u32 seq, u16 flags, int event, bool unicast);
491
53681407
JP		 492static struct tcf_chain *__tcf_chain_get(struct tcf_block *block,
493 u32 chain_index, bool create,
494 bool by_act)
32a4f5ec 495{
c266f64d
VB		 496 struct tcf_chain *chain = NULL;
497 bool is_first_reference;
32a4f5ec 498
c266f64d
VB		 499 mutex_lock(&block->lock);
500 chain = tcf_chain_lookup(block, chain_index);
32a4f5ec
JP		 501 if (chain) {
502 tcf_chain_hold(chain);
53681407
JP		 503 } else {
504 if (!create)
c266f64d 505 goto errout;
53681407
JP		 506 chain = tcf_chain_create(block, chain_index);
507 if (!chain)
c266f64d 508 goto errout;
5bc17018 509 }
80532384 510
53681407
JP		 511 if (by_act)
512 ++chain->action_refcnt;
c266f64d
VB		 513 is_first_reference = chain->refcnt - chain->action_refcnt == 1;
514 mutex_unlock(&block->lock);
53681407
JP		 515
516 /* Send notification only in case we got the first
517 * non-action reference. Until then, the chain acts only as
518 * a placeholder for actions pointing to it and user ought
519 * not know about them.
520 */
c266f64d 521 if (is_first_reference && !by_act)
53681407
JP		 522 tc_chain_notify(chain, NULL, 0, NLM_F_CREATE | NLM_F_EXCL,
523 RTM_NEWCHAIN, false);
524
32a4f5ec 525 return chain;
c266f64d
VB		 526
527errout:
528 mutex_unlock(&block->lock);
529 return chain;
5bc17018 530}
53681407 531
290b1c8b
JP		 532static struct tcf_chain *tcf_chain_get(struct tcf_block *block, u32 chain_index,
533 bool create)
53681407
JP		 534{
535 return __tcf_chain_get(block, chain_index, create, false);
536}
5bc17018 537
1f3ed383
JP		 538struct tcf_chain *tcf_chain_get_by_act(struct tcf_block *block, u32 chain_index)
539{
53681407 540 return __tcf_chain_get(block, chain_index, true, true);
1f3ed383
JP		 541}
542EXPORT_SYMBOL(tcf_chain_get_by_act);
543
a5654820
VB		 544static void tc_chain_tmplt_del(const struct tcf_proto_ops *tmplt_ops,
545 void *tmplt_priv);
546static int tc_chain_notify_delete(const struct tcf_proto_ops *tmplt_ops,
547 void *tmplt_priv, u32 chain_index,
548 struct tcf_block *block, struct sk_buff *oskb,
549 u32 seq, u16 flags, bool unicast);
9f407f17 550
91052fa1
VB		 551static void __tcf_chain_put(struct tcf_chain *chain, bool by_act,
552 bool explicitly_created)
5bc17018 553{
c266f64d 554 struct tcf_block *block = chain->block;
a5654820 555 const struct tcf_proto_ops *tmplt_ops;
b62989fc 556 bool free_block = false;
c266f64d 557 unsigned int refcnt;
a5654820 558 void *tmplt_priv;
c266f64d
VB		 559
560 mutex_lock(&block->lock);
91052fa1
VB		 561 if (explicitly_created) {
562 if (!chain->explicitly_created) {
563 mutex_unlock(&block->lock);
564 return;
565 }
566 chain->explicitly_created = false;
567 }
568
53681407
JP		 569 if (by_act)
570 chain->action_refcnt--;
c266f64d
VB		 571
572 /* tc_chain_notify_delete can't be called while holding block lock.
573 * However, when block is unlocked chain can be changed concurrently, so
574 * save these to temporary variables.
575 */
576 refcnt = --chain->refcnt;
a5654820
VB		 577 tmplt_ops = chain->tmplt_ops;
578 tmplt_priv = chain->tmplt_priv;
53681407
JP		 579
580 /* The last dropped non-action reference will trigger notification. */
b62989fc
VB		 581 if (refcnt - chain->action_refcnt == 0 && !by_act) {
582 tc_chain_notify_delete(tmplt_ops, tmplt_priv, chain->index,
a5654820 583 block, NULL, 0, 0, false);
726d0612
VB		 584 /* Last reference to chain, no need to lock. */
585 chain->flushing = false;
586 }
53681407 587
b62989fc
VB		 588 if (refcnt == 0)
589 free_block = tcf_chain_detach(chain);
590 mutex_unlock(&block->lock);
591
c266f64d 592 if (refcnt == 0) {
a5654820 593 tc_chain_tmplt_del(tmplt_ops, tmplt_priv);
c266f64d 594 tcf_chain_destroy(chain, free_block);
32a4f5ec 595 }
5bc17018 596}
53681407 597
290b1c8b 598static void tcf_chain_put(struct tcf_chain *chain)
53681407 599{
91052fa1 600 __tcf_chain_put(chain, false, false);
53681407 601}
5bc17018 602
1f3ed383
JP		 603void tcf_chain_put_by_act(struct tcf_chain *chain)
604{
91052fa1 605 __tcf_chain_put(chain, true, false);
1f3ed383
JP		 606}
607EXPORT_SYMBOL(tcf_chain_put_by_act);
608
32a4f5ec
JP		 609static void tcf_chain_put_explicitly_created(struct tcf_chain *chain)
610{
91052fa1 611 __tcf_chain_put(chain, false, true);
32a4f5ec
JP		 612}
613
12db03b6 614static void tcf_chain_flush(struct tcf_chain *chain, bool rtnl_held)
290b1c8b 615{
4dbfa766 616 struct tcf_proto *tp, *tp_next;
290b1c8b 617
ed76f5ed
VB		 618 mutex_lock(&chain->filter_chain_lock);
619 tp = tcf_chain_dereference(chain->filter_chain, chain);
59eb87cb
JH		 620 while (tp) {
621 tp_next = rcu_dereference_protected(tp->next, 1);
622 tcf_proto_signal_destroying(chain, tp);
623 tp = tp_next;
624 }
625 tp = tcf_chain_dereference(chain->filter_chain, chain);
4dbfa766 626 RCU_INIT_POINTER(chain->filter_chain, NULL);
290b1c8b 627 tcf_chain0_head_change(chain, NULL);
726d0612 628 chain->flushing = true;
ed76f5ed
VB		 629 mutex_unlock(&chain->filter_chain_lock);
630
290b1c8b 631 while (tp) {
4dbfa766 632 tp_next = rcu_dereference_protected(tp->next, 1);
12db03b6 633 tcf_proto_put(tp, rtnl_held, NULL);
4dbfa766 634 tp = tp_next;
290b1c8b
JP		 635 }
636}
637
59094b1e
PNA		 638static int tcf_block_setup(struct tcf_block *block,
639 struct flow_block_offload *bo);
640
324a823b 641static void tcf_block_offload_init(struct flow_block_offload *bo,
c40f4e50 642 struct net_device *dev, struct Qdisc *sch,
324a823b
PNA		 643 enum flow_block_command command,
644 enum flow_block_binder_type binder_type,
645 struct flow_block *flow_block,
646 bool shared, struct netlink_ext_ack *extack)
647{
648 bo->net = dev_net(dev);
649 bo->command = command;
650 bo->binder_type = binder_type;
651 bo->block = flow_block;
652 bo->block_shared = shared;
653 bo->extack = extack;
c40f4e50 654 bo->sch = sch;
74fc4f82 655 bo->cb_list_head = &flow_block->cb_list;
324a823b
PNA		 656 INIT_LIST_HEAD(&bo->cb_list);
657}
658
0fdcf78d
PNA		 659static void tcf_block_unbind(struct tcf_block *block,
660 struct flow_block_offload *bo);
661
662static void tc_block_indr_cleanup(struct flow_block_cb *block_cb)
7f76fa36 663{
0fdcf78d
PNA		 664 struct tcf_block *block = block_cb->indr.data;
665 struct net_device *dev = block_cb->indr.dev;
c40f4e50 666 struct Qdisc *sch = block_cb->indr.sch;
0fdcf78d 667 struct netlink_ext_ack extack = {};
990b03b0 668 struct flow_block_offload bo = {};
7f76fa36 669
c40f4e50 670 tcf_block_offload_init(&bo, dev, sch, FLOW_BLOCK_UNBIND,
0fdcf78d
PNA		 671 block_cb->indr.binder_type,
672 &block->flow_block, tcf_block_shared(block),
673 &extack);
d6535dca 674 rtnl_lock();
0fdcf78d 675 down_write(&block->cb_lock);
a1db2178 676 list_del(&block_cb->driver_list);
0fdcf78d 677 list_move(&block_cb->list, &bo.cb_list);
0fdcf78d 678 tcf_block_unbind(block, &bo);
d6535dca 679 up_write(&block->cb_lock);
0fdcf78d 680 rtnl_unlock();
7f76fa36
JH		 681}
682
caa72601
JP		 683static bool tcf_block_offload_in_use(struct tcf_block *block)
684{
97394bef 685 return atomic_read(&block->offloadcnt);
caa72601
JP		 686}
687
688static int tcf_block_offload_cmd(struct tcf_block *block,
c40f4e50 689 struct net_device *dev, struct Qdisc *sch,
caa72601 690 struct tcf_block_ext_info *ei,
9c0e189e 691 enum flow_block_command command,
60513bd8 692 struct netlink_ext_ack *extack)
8c4083b3 693{
955bcb6e 694 struct flow_block_offload bo = {};
8c4083b3 695
c40f4e50 696 tcf_block_offload_init(&bo, dev, sch, command, ei->binder_type,
324a823b
PNA		 697 &block->flow_block, tcf_block_shared(block),
698 extack);
59094b1e 699
3c005110 700 if (dev->netdev_ops->ndo_setup_tc) {
701 int err;
702
0fdcf78d 703 err = dev->netdev_ops->ndo_setup_tc(dev, TC_SETUP_BLOCK, &bo);
3c005110 704 if (err < 0) {
705 if (err != -EOPNOTSUPP)
706 NL_SET_ERR_MSG(extack, "Driver ndo_setup_tc failed");
707 return err;
708 }
709
710 return tcf_block_setup(block, &bo);
b70ba69e 711 }
59094b1e 712
c40f4e50 713 flow_indr_dev_setup_offload(dev, sch, TC_SETUP_BLOCK, block, &bo,
3c005110 714 tc_block_indr_cleanup);
715 tcf_block_setup(block, &bo);
716
717 return -EOPNOTSUPP;
8c4083b3
JP		 718}
719
caa72601 720static int tcf_block_offload_bind(struct tcf_block *block, struct Qdisc *q,
60513bd8
JH		 721 struct tcf_block_ext_info *ei,
722 struct netlink_ext_ack *extack)
8c4083b3 723{
caa72601
JP		 724 struct net_device *dev = q->dev_queue->dev;
725 int err;
726
4f8116c8 727 down_write(&block->cb_lock);
caa72601
JP		 728
729 /* If tc offload feature is disabled and the block we try to bind
730 * to already has some offloaded filters, forbid to bind.
731 */
0fdcf78d
PNA		 732 if (dev->netdev_ops->ndo_setup_tc &&
733 !tc_can_offload(dev) &&
734 tcf_block_offload_in_use(block)) {
60513bd8 735 NL_SET_ERR_MSG(extack, "Bind to offloaded block failed as dev has offload disabled");
4f8116c8
VB		 736 err = -EOPNOTSUPP;
737 goto err_unlock;
60513bd8 738 }
caa72601 739
c40f4e50 740 err = tcf_block_offload_cmd(block, dev, q, ei, FLOW_BLOCK_BIND, extack);
caa72601
JP		 741 if (err == -EOPNOTSUPP)
742 goto no_offload_dev_inc;
7f76fa36 743 if (err)
4f8116c8 744 goto err_unlock;
7f76fa36 745
4f8116c8 746 up_write(&block->cb_lock);
7f76fa36 747 return 0;
caa72601
JP		 748
749no_offload_dev_inc:
0fdcf78d 750 if (tcf_block_offload_in_use(block))
4f8116c8 751 goto err_unlock;
0fdcf78d 752
4f8116c8 753 err = 0;
caa72601 754 block->nooffloaddevcnt++;
4f8116c8
VB		 755err_unlock:
756 up_write(&block->cb_lock);
757 return err;
8c4083b3
JP		 758}
759
760static void tcf_block_offload_unbind(struct tcf_block *block, struct Qdisc *q,
761 struct tcf_block_ext_info *ei)
762{
caa72601
JP		 763 struct net_device *dev = q->dev_queue->dev;
764 int err;
765
4f8116c8 766 down_write(&block->cb_lock);
c40f4e50 767 err = tcf_block_offload_cmd(block, dev, q, ei, FLOW_BLOCK_UNBIND, NULL);
caa72601
JP		 768 if (err == -EOPNOTSUPP)
769 goto no_offload_dev_dec;
4f8116c8 770 up_write(&block->cb_lock);
caa72601
JP		 771 return;
772
773no_offload_dev_dec:
774 WARN_ON(block->nooffloaddevcnt-- == 0);
4f8116c8 775 up_write(&block->cb_lock);
8c4083b3
JP		 776}
777
a9b19443 778static int
f71e0ca4
JP		 779tcf_chain0_head_change_cb_add(struct tcf_block *block,
780 struct tcf_block_ext_info *ei,
781 struct netlink_ext_ack *extack)
a9b19443
JP		 782{
783 struct tcf_filter_chain_list_item *item;
165f0135 784 struct tcf_chain *chain0;
a9b19443
JP		 785
786 item = kmalloc(sizeof(*item), GFP_KERNEL);
787 if (!item) {
788 NL_SET_ERR_MSG(extack, "Memory allocation for head change callback item failed");
789 return -ENOMEM;
790 }
791 item->chain_head_change = ei->chain_head_change;
792 item->chain_head_change_priv = ei->chain_head_change_priv;
165f0135
VB		 793
794 mutex_lock(&block->lock);
795 chain0 = block->chain0.chain;
ed76f5ed
VB		 796 if (chain0)
797 tcf_chain_hold(chain0);
798 else
799 list_add(&item->list, &block->chain0.filter_chain_list);
165f0135
VB		 800 mutex_unlock(&block->lock);
801
ed76f5ed
VB		 802 if (chain0) {
803 struct tcf_proto *tp_head;
804
805 mutex_lock(&chain0->filter_chain_lock);
806
807 tp_head = tcf_chain_dereference(chain0->filter_chain, chain0);
808 if (tp_head)
809 tcf_chain_head_change_item(item, tp_head);
810
811 mutex_lock(&block->lock);
812 list_add(&item->list, &block->chain0.filter_chain_list);
813 mutex_unlock(&block->lock);
814
815 mutex_unlock(&chain0->filter_chain_lock);
816 tcf_chain_put(chain0);
817 }
818
a9b19443
JP		 819 return 0;
820}
821
822static void
f71e0ca4
JP		 823tcf_chain0_head_change_cb_del(struct tcf_block *block,
824 struct tcf_block_ext_info *ei)
a9b19443
JP		 825{
826 struct tcf_filter_chain_list_item *item;
827
165f0135 828 mutex_lock(&block->lock);
f71e0ca4 829 list_for_each_entry(item, &block->chain0.filter_chain_list, list) {
a9b19443
JP		 830 if ((!ei->chain_head_change && !ei->chain_head_change_priv) ||
831 (item->chain_head_change == ei->chain_head_change &&
832 item->chain_head_change_priv == ei->chain_head_change_priv)) {
165f0135 833 if (block->chain0.chain)
f71e0ca4 834 tcf_chain_head_change_item(item, NULL);
a9b19443 835 list_del(&item->list);
165f0135
VB		 836 mutex_unlock(&block->lock);
837
a9b19443
JP		 838 kfree(item);
839 return;
840 }
841 }
165f0135 842 mutex_unlock(&block->lock);
a9b19443
JP		 843 WARN_ON(1);
844}
845
48617387 846struct tcf_net {
ab281629 847 spinlock_t idr_lock; /* Protects idr */
48617387
JP		 848 struct idr idr;
849};
850
851static unsigned int tcf_net_id;
852
853static int tcf_block_insert(struct tcf_block *block, struct net *net,
bb047ddd 854 struct netlink_ext_ack *extack)
a9b19443 855{
48617387 856 struct tcf_net *tn = net_generic(net, tcf_net_id);
ab281629
VB		 857 int err;
858
859 idr_preload(GFP_KERNEL);
860 spin_lock(&tn->idr_lock);
861 err = idr_alloc_u32(&tn->idr, block, &block->index, block->index,
862 GFP_NOWAIT);
863 spin_unlock(&tn->idr_lock);
864 idr_preload_end();
48617387 865
ab281629 866 return err;
a9b19443
JP		 867}
868
48617387
JP		 869static void tcf_block_remove(struct tcf_block *block, struct net *net)
870{
871 struct tcf_net *tn = net_generic(net, tcf_net_id);
872
ab281629 873 spin_lock(&tn->idr_lock);
9c160941 874 idr_remove(&tn->idr, block->index);
ab281629 875 spin_unlock(&tn->idr_lock);
48617387
JP		 876}
877
878static struct tcf_block *tcf_block_create(struct net *net, struct Qdisc *q,
bb047ddd 879 u32 block_index,
48617387 880 struct netlink_ext_ack *extack)
6529eaba 881{
48617387 882 struct tcf_block *block;
6529eaba 883
48617387 884 block = kzalloc(sizeof(*block), GFP_KERNEL);
8d1a77f9
AA		 885 if (!block) {
886 NL_SET_ERR_MSG(extack, "Memory allocation for block failed");
48617387 887 return ERR_PTR(-ENOMEM);
8d1a77f9 888 }
c266f64d 889 mutex_init(&block->lock);
59eb87cb 890 mutex_init(&block->proto_destroy_lock);
4f8116c8 891 init_rwsem(&block->cb_lock);
14bfb13f 892 flow_block_init(&block->flow_block);
5bc17018 893 INIT_LIST_HEAD(&block->chain_list);
f36fe1c4 894 INIT_LIST_HEAD(&block->owner_list);
f71e0ca4 895 INIT_LIST_HEAD(&block->chain0.filter_chain_list);
acb67442 896
cfebd7e2 897 refcount_set(&block->refcnt, 1);
48617387 898 block->net = net;
bb047ddd
JP		 899 block->index = block_index;
900
901 /* Don't store q pointer for blocks which are shared */
902 if (!tcf_block_shared(block))
903 block->q = q;
48617387 904 return block;
48617387
JP		 905}
906
907static struct tcf_block *tcf_block_lookup(struct net *net, u32 block_index)
908{
909 struct tcf_net *tn = net_generic(net, tcf_net_id);
910
322d884b 911 return idr_find(&tn->idr, block_index);
48617387
JP		 912}
913
0607e439
VB		 914static struct tcf_block *tcf_block_refcnt_get(struct net *net, u32 block_index)
915{
916 struct tcf_block *block;
917
918 rcu_read_lock();
919 block = tcf_block_lookup(net, block_index);
920 if (block && !refcount_inc_not_zero(&block->refcnt))
921 block = NULL;
922 rcu_read_unlock();
923
924 return block;
925}
926
bbf73830
VB		 927static struct tcf_chain *
928__tcf_get_next_chain(struct tcf_block *block, struct tcf_chain *chain)
f0023436 929{
bbf73830
VB		 930 mutex_lock(&block->lock);
931 if (chain)
932 chain = list_is_last(&chain->list, &block->chain_list) ?
933 NULL : list_next_entry(chain, list);
934 else
935 chain = list_first_entry_or_null(&block->chain_list,
936 struct tcf_chain, list);
f0023436 937
bbf73830
VB		 938 /* skip all action-only chains */
939 while (chain && tcf_chain_held_by_acts_only(chain))
940 chain = list_is_last(&chain->list, &block->chain_list) ?
941 NULL : list_next_entry(chain, list);
942
943 if (chain)
f0023436 944 tcf_chain_hold(chain);
bbf73830 945 mutex_unlock(&block->lock);
f0023436 946
bbf73830 947 return chain;
f0023436
VB		 948}
949
bbf73830
VB		 950/* Function to be used by all clients that want to iterate over all chains on
951 * block. It properly obtains block->lock and takes reference to chain before
952 * returning it. Users of this function must be tolerant to concurrent chain
953 * insertion/deletion or ensure that no concurrent chain modification is
954 * possible. Note that all netlink dump callbacks cannot guarantee to provide
955 * consistent dump because rtnl lock is released each time skb is filled with
956 * data and sent to user-space.
957 */
958
959struct tcf_chain *
960tcf_get_next_chain(struct tcf_block *block, struct tcf_chain *chain)
f0023436 961{
bbf73830 962 struct tcf_chain *chain_next = __tcf_get_next_chain(block, chain);
f0023436 963
bbf73830 964 if (chain)
f0023436 965 tcf_chain_put(chain);
bbf73830
VB		 966
967 return chain_next;
968}
969EXPORT_SYMBOL(tcf_get_next_chain);
970
fe2923af
VB		 971static struct tcf_proto *
972__tcf_get_next_proto(struct tcf_chain *chain, struct tcf_proto *tp)
973{
8b64678e
VB		 974 u32 prio = 0;
975
fe2923af
VB		 976 ASSERT_RTNL();
977 mutex_lock(&chain->filter_chain_lock);
978
8b64678e 979 if (!tp) {
fe2923af 980 tp = tcf_chain_dereference(chain->filter_chain, chain);
8b64678e
VB		 981 } else if (tcf_proto_is_deleting(tp)) {
982 /* 'deleting' flag is set and chain->filter_chain_lock was
983 * unlocked, which means next pointer could be invalid. Restart
984 * search.
985 */
986 prio = tp->prio + 1;
987 tp = tcf_chain_dereference(chain->filter_chain, chain);
988
989 for (; tp; tp = tcf_chain_dereference(tp->next, chain))
990 if (!tp->deleting && tp->prio >= prio)
991 break;
992 } else {
fe2923af 993 tp = tcf_chain_dereference(tp->next, chain);
8b64678e 994 }
fe2923af
VB		 995
996 if (tp)
997 tcf_proto_get(tp);
998
999 mutex_unlock(&chain->filter_chain_lock);
1000
1001 return tp;
1002}
1003
1004/* Function to be used by all clients that want to iterate over all tp's on
1005 * chain. Users of this function must be tolerant to concurrent tp
1006 * insertion/deletion or ensure that no concurrent chain modification is
1007 * possible. Note that all netlink dump callbacks cannot guarantee to provide
1008 * consistent dump because rtnl lock is released each time skb is filled with
1009 * data and sent to user-space.
1010 */
1011
1012struct tcf_proto *
0fca55ed 1013tcf_get_next_proto(struct tcf_chain *chain, struct tcf_proto *tp)
fe2923af
VB		 1014{
1015 struct tcf_proto *tp_next = __tcf_get_next_proto(chain, tp);
1016
1017 if (tp)
0fca55ed 1018 tcf_proto_put(tp, true, NULL);
fe2923af
VB		 1019
1020 return tp_next;
1021}
1022EXPORT_SYMBOL(tcf_get_next_proto);
1023
12db03b6 1024static void tcf_block_flush_all_chains(struct tcf_block *block, bool rtnl_held)
bbf73830
VB		 1025{
1026 struct tcf_chain *chain;
1027
1028 /* Last reference to block. At this point chains cannot be added or
1029 * removed concurrently.
1030 */
1031 for (chain = tcf_get_next_chain(block, NULL);
1032 chain;
1033 chain = tcf_get_next_chain(block, chain)) {
1034 tcf_chain_put_explicitly_created(chain);
12db03b6 1035 tcf_chain_flush(chain, rtnl_held);
f0023436
VB		 1036 }
1037}
1038
18d3eefb
VB		 1039/* Lookup Qdisc and increments its reference counter.
1040 * Set parent, if necessary.
1041 */
1042
1043static int __tcf_qdisc_find(struct net *net, struct Qdisc **q,
1044 u32 *parent, int ifindex, bool rtnl_held,
1045 struct netlink_ext_ack *extack)
1046{
1047 const struct Qdisc_class_ops *cops;
1048 struct net_device *dev;
1049 int err = 0;
1050
1051 if (ifindex == TCM_IFINDEX_MAGIC_BLOCK)
1052 return 0;
1053
1054 rcu_read_lock();
1055
1056 /* Find link */
1057 dev = dev_get_by_index_rcu(net, ifindex);
1058 if (!dev) {
1059 rcu_read_unlock();
1060 return -ENODEV;
1061 }
1062
1063 /* Find qdisc */
1064 if (!*parent) {
5891cd5e 1065 *q = rcu_dereference(dev->qdisc);
18d3eefb
VB		 1066 *parent = (*q)->handle;
1067 } else {
1068 *q = qdisc_lookup_rcu(dev, TC_H_MAJ(*parent));
1069 if (!*q) {
1070 NL_SET_ERR_MSG(extack, "Parent Qdisc doesn't exists");
1071 err = -EINVAL;
1072 goto errout_rcu;
1073 }
1074 }
1075
1076 *q = qdisc_refcount_inc_nz(*q);
1077 if (!*q) {
1078 NL_SET_ERR_MSG(extack, "Parent Qdisc doesn't exists");
1079 err = -EINVAL;
1080 goto errout_rcu;
1081 }
1082
1083 /* Is it classful? */
1084 cops = (*q)->ops->cl_ops;
1085 if (!cops) {
1086 NL_SET_ERR_MSG(extack, "Qdisc not classful");
1087 err = -EINVAL;
1088 goto errout_qdisc;
1089 }
1090
1091 if (!cops->tcf_block) {
1092 NL_SET_ERR_MSG(extack, "Class doesn't support blocks");
1093 err = -EOPNOTSUPP;
1094 goto errout_qdisc;
1095 }
1096
1097errout_rcu:
1098 /* At this point we know that qdisc is not noop_qdisc,
1099 * which means that qdisc holds a reference to net_device
1100 * and we hold a reference to qdisc, so it is safe to release
1101 * rcu read lock.
1102 */
1103 rcu_read_unlock();
1104 return err;
1105
1106errout_qdisc:
1107 rcu_read_unlock();
1108
1109 if (rtnl_held)
1110 qdisc_put(*q);
1111 else
1112 qdisc_put_unlocked(*q);
1113 *q = NULL;
1114
1115 return err;
1116}
1117
1118static int __tcf_qdisc_cl_find(struct Qdisc *q, u32 parent, unsigned long *cl,
1119 int ifindex, struct netlink_ext_ack *extack)
1120{
1121 if (ifindex == TCM_IFINDEX_MAGIC_BLOCK)
1122 return 0;
1123
1124 /* Do we search for filter, attached to class? */
1125 if (TC_H_MIN(parent)) {
1126 const struct Qdisc_class_ops *cops = q->ops->cl_ops;
1127
1128 *cl = cops->find(q, parent);
1129 if (*cl == 0) {
1130 NL_SET_ERR_MSG(extack, "Specified class doesn't exist");
1131 return -ENOENT;
1132 }
1133 }
1134
1135 return 0;
1136}
1137
1138static struct tcf_block *__tcf_block_find(struct net *net, struct Qdisc *q,
1139 unsigned long cl, int ifindex,
1140 u32 block_index,
1141 struct netlink_ext_ack *extack)
1142{
1143 struct tcf_block *block;
1144
1145 if (ifindex == TCM_IFINDEX_MAGIC_BLOCK) {
1146 block = tcf_block_refcnt_get(net, block_index);
1147 if (!block) {
1148 NL_SET_ERR_MSG(extack, "Block of given index was not found");
1149 return ERR_PTR(-EINVAL);
1150 }
1151 } else {
1152 const struct Qdisc_class_ops *cops = q->ops->cl_ops;
1153
1154 block = cops->tcf_block(q, cl, extack);
1155 if (!block)
1156 return ERR_PTR(-EINVAL);
1157
1158 if (tcf_block_shared(block)) {
1159 NL_SET_ERR_MSG(extack, "This filter block is shared. Please use the block index to manipulate the filters");
1160 return ERR_PTR(-EOPNOTSUPP);
1161 }
1162
1163 /* Always take reference to block in order to support execution
1164 * of rules update path of cls API without rtnl lock. Caller
1165 * must release block when it is finished using it. 'if' block
1166 * of this conditional obtain reference to block by calling
1167 * tcf_block_refcnt_get().
1168 */
1169 refcount_inc(&block->refcnt);
1170 }
1171
1172 return block;
1173}
1174
0607e439 1175static void __tcf_block_put(struct tcf_block *block, struct Qdisc *q,
12db03b6 1176 struct tcf_block_ext_info *ei, bool rtnl_held)
0607e439 1177{
c266f64d 1178 if (refcount_dec_and_mutex_lock(&block->refcnt, &block->lock)) {
0607e439
VB		 1179 /* Flushing/putting all chains will cause the block to be
1180 * deallocated when last chain is freed. However, if chain_list
1181 * is empty, block has to be manually deallocated. After block
1182 * reference counter reached 0, it is no longer possible to
1183 * increment it or add new chains to block.
1184 */
1185 bool free_block = list_empty(&block->chain_list);
1186
c266f64d 1187 mutex_unlock(&block->lock);
0607e439
VB		 1188 if (tcf_block_shared(block))
1189 tcf_block_remove(block, block->net);
0607e439
VB		 1190
1191 if (q)
1192 tcf_block_offload_unbind(block, q, ei);
1193
1194 if (free_block)
c266f64d 1195 tcf_block_destroy(block);
0607e439 1196 else
12db03b6 1197 tcf_block_flush_all_chains(block, rtnl_held);
0607e439
VB		 1198 } else if (q) {
1199 tcf_block_offload_unbind(block, q, ei);
1200 }
1201}
1202
12db03b6 1203static void tcf_block_refcnt_put(struct tcf_block *block, bool rtnl_held)
0607e439 1204{
12db03b6 1205 __tcf_block_put(block, NULL, NULL, rtnl_held);
0607e439
VB		 1206}
1207
c431f89b
VB		 1208/* Find tcf block.
1209 * Set q, parent, cl when appropriate.
1210 */
1211
1212static struct tcf_block *tcf_block_find(struct net *net, struct Qdisc **q,
1213 u32 *parent, unsigned long *cl,
1214 int ifindex, u32 block_index,
1215 struct netlink_ext_ack *extack)
1216{
1217 struct tcf_block *block;
e368fdb6 1218 int err = 0;
c431f89b 1219
18d3eefb 1220 ASSERT_RTNL();
e368fdb6 1221
18d3eefb
VB		 1222 err = __tcf_qdisc_find(net, q, parent, ifindex, true, extack);
1223 if (err)
1224 goto errout;
c431f89b 1225
18d3eefb
VB		 1226 err = __tcf_qdisc_cl_find(*q, *parent, cl, ifindex, extack);
1227 if (err)
1228 goto errout_qdisc;
787ce6d0 1229
18d3eefb 1230 block = __tcf_block_find(net, *q, *cl, ifindex, block_index, extack);
af736bf0
DC		 1231 if (IS_ERR(block)) {
1232 err = PTR_ERR(block);
18d3eefb 1233 goto errout_qdisc;
af736bf0 1234 }
c431f89b
VB		 1235
1236 return block;
e368fdb6 1237
e368fdb6 1238errout_qdisc:
18d3eefb 1239 if (*q)
e368fdb6 1240 qdisc_put(*q);
18d3eefb
VB		 1241errout:
1242 *q = NULL;
e368fdb6
VB		 1243 return ERR_PTR(err);
1244}
1245
12db03b6
VB		 1246static void tcf_block_release(struct Qdisc *q, struct tcf_block *block,
1247 bool rtnl_held)
e368fdb6 1248{
787ce6d0 1249 if (!IS_ERR_OR_NULL(block))
12db03b6 1250 tcf_block_refcnt_put(block, rtnl_held);
787ce6d0 1251
470502de
VB		 1252 if (q) {
1253 if (rtnl_held)
1254 qdisc_put(q);
1255 else
1256 qdisc_put_unlocked(q);
1257 }
c431f89b
VB		 1258}
1259
f36fe1c4
JP		 1260struct tcf_block_owner_item {
1261 struct list_head list;
1262 struct Qdisc *q;
32f8c409 1263 enum flow_block_binder_type binder_type;
f36fe1c4
JP		 1264};
1265
1266static void
1267tcf_block_owner_netif_keep_dst(struct tcf_block *block,
1268 struct Qdisc *q,
32f8c409 1269 enum flow_block_binder_type binder_type)
f36fe1c4
JP		 1270{
1271 if (block->keep_dst &&
32f8c409
PNA		 1272 binder_type != FLOW_BLOCK_BINDER_TYPE_CLSACT_INGRESS &&
1273 binder_type != FLOW_BLOCK_BINDER_TYPE_CLSACT_EGRESS)
f36fe1c4
JP		 1274 netif_keep_dst(qdisc_dev(q));
1275}
1276
1277void tcf_block_netif_keep_dst(struct tcf_block *block)
1278{
1279 struct tcf_block_owner_item *item;
1280
1281 block->keep_dst = true;
1282 list_for_each_entry(item, &block->owner_list, list)
1283 tcf_block_owner_netif_keep_dst(block, item->q,
1284 item->binder_type);
1285}
1286EXPORT_SYMBOL(tcf_block_netif_keep_dst);
1287
1288static int tcf_block_owner_add(struct tcf_block *block,
1289 struct Qdisc *q,
32f8c409 1290 enum flow_block_binder_type binder_type)
f36fe1c4
JP		 1291{
1292 struct tcf_block_owner_item *item;
1293
1294 item = kmalloc(sizeof(*item), GFP_KERNEL);
1295 if (!item)
1296 return -ENOMEM;
1297 item->q = q;
1298 item->binder_type = binder_type;
1299 list_add(&item->list, &block->owner_list);
1300 return 0;
1301}
1302
1303static void tcf_block_owner_del(struct tcf_block *block,
1304 struct Qdisc *q,
32f8c409 1305 enum flow_block_binder_type binder_type)
f36fe1c4
JP		 1306{
1307 struct tcf_block_owner_item *item;
1308
1309 list_for_each_entry(item, &block->owner_list, list) {
1310 if (item->q == q && item->binder_type == binder_type) {
1311 list_del(&item->list);
1312 kfree(item);
1313 return;
1314 }
1315 }
1316 WARN_ON(1);
1317}
1318
48617387
JP		 1319int tcf_block_get_ext(struct tcf_block **p_block, struct Qdisc *q,
1320 struct tcf_block_ext_info *ei,
1321 struct netlink_ext_ack *extack)
1322{
1323 struct net *net = qdisc_net(q);
1324 struct tcf_block *block = NULL;
48617387
JP		 1325 int err;
1326
787ce6d0 1327 if (ei->block_index)
48617387 1328 /* block_index not 0 means the shared block is requested */
787ce6d0 1329 block = tcf_block_refcnt_get(net, ei->block_index);
48617387
JP		 1330
1331 if (!block) {
bb047ddd 1332 block = tcf_block_create(net, q, ei->block_index, extack);
48617387
JP		 1333 if (IS_ERR(block))
1334 return PTR_ERR(block);
bb047ddd
JP		 1335 if (tcf_block_shared(block)) {
1336 err = tcf_block_insert(block, net, extack);
48617387
JP		 1337 if (err)
1338 goto err_block_insert;
1339 }
1340 }
1341
f36fe1c4
JP		 1342 err = tcf_block_owner_add(block, q, ei->binder_type);
1343 if (err)
1344 goto err_block_owner_add;
1345
1346 tcf_block_owner_netif_keep_dst(block, q, ei->binder_type);
1347
f71e0ca4 1348 err = tcf_chain0_head_change_cb_add(block, ei, extack);
a9b19443 1349 if (err)
f71e0ca4 1350 goto err_chain0_head_change_cb_add;
caa72601 1351
60513bd8 1352 err = tcf_block_offload_bind(block, q, ei, extack);
caa72601
JP		 1353 if (err)
1354 goto err_block_offload_bind;
1355
6529eaba
JP		 1356 *p_block = block;
1357 return 0;
2190d1d0 1358
caa72601 1359err_block_offload_bind:
f71e0ca4
JP		 1360 tcf_chain0_head_change_cb_del(block, ei);
1361err_chain0_head_change_cb_add:
f36fe1c4
JP		 1362 tcf_block_owner_del(block, q, ei->binder_type);
1363err_block_owner_add:
48617387 1364err_block_insert:
12db03b6 1365 tcf_block_refcnt_put(block, true);
2190d1d0 1366 return err;
6529eaba 1367}
8c4083b3
JP		 1368EXPORT_SYMBOL(tcf_block_get_ext);
1369
c7eb7d72
JP		 1370static void tcf_chain_head_change_dflt(struct tcf_proto *tp_head, void *priv)
1371{
1372 struct tcf_proto __rcu **p_filter_chain = priv;
1373
1374 rcu_assign_pointer(*p_filter_chain, tp_head);
1375}
1376
8c4083b3 1377int tcf_block_get(struct tcf_block **p_block,
8d1a77f9
AA		 1378 struct tcf_proto __rcu **p_filter_chain, struct Qdisc *q,
1379 struct netlink_ext_ack *extack)
8c4083b3 1380{
c7eb7d72
JP		 1381 struct tcf_block_ext_info ei = {
1382 .chain_head_change = tcf_chain_head_change_dflt,
1383 .chain_head_change_priv = p_filter_chain,
1384 };
8c4083b3 1385
c7eb7d72 1386 WARN_ON(!p_filter_chain);
8d1a77f9 1387 return tcf_block_get_ext(p_block, q, &ei, extack);
8c4083b3 1388}
6529eaba
JP		 1389EXPORT_SYMBOL(tcf_block_get);
1390
7aa0045d 1391/* XXX: Standalone actions are not allowed to jump to any chain, and bound
a60b3f51 1392 * actions should be all removed after flushing.
7aa0045d 1393 */
c7eb7d72 1394void tcf_block_put_ext(struct tcf_block *block, struct Qdisc *q,
e1ea2f98 1395 struct tcf_block_ext_info *ei)
7aa0045d 1396{
c30abd5e
DM		 1397 if (!block)
1398 return;
f71e0ca4 1399 tcf_chain0_head_change_cb_del(block, ei);
f36fe1c4 1400 tcf_block_owner_del(block, q, ei->binder_type);
a60b3f51 1401
12db03b6 1402 __tcf_block_put(block, q, ei, true);
6529eaba 1403}
8c4083b3
JP		 1404EXPORT_SYMBOL(tcf_block_put_ext);
1405
1406void tcf_block_put(struct tcf_block *block)
1407{
1408 struct tcf_block_ext_info ei = {0, };
1409
4853f128
JP		 1410 if (!block)
1411 return;
c7eb7d72 1412 tcf_block_put_ext(block, block->q, &ei);
8c4083b3 1413}
e1ea2f98 1414
6529eaba 1415EXPORT_SYMBOL(tcf_block_put);
cf1facda 1416
32636742 1417static int
a7323311 1418tcf_block_playback_offloads(struct tcf_block *block, flow_setup_cb_t *cb,
32636742
JH		 1419 void *cb_priv, bool add, bool offload_in_use,
1420 struct netlink_ext_ack *extack)
1421{
bbf73830 1422 struct tcf_chain *chain, *chain_prev;
fe2923af 1423 struct tcf_proto *tp, *tp_prev;
32636742
JH		 1424 int err;
1425
4f8116c8
VB		 1426 lockdep_assert_held(&block->cb_lock);
1427
bbf73830
VB		 1428 for (chain = __tcf_get_next_chain(block, NULL);
1429 chain;
1430 chain_prev = chain,
1431 chain = __tcf_get_next_chain(block, chain),
1432 tcf_chain_put(chain_prev)) {
fe2923af
VB		 1433 for (tp = __tcf_get_next_proto(chain, NULL); tp;
1434 tp_prev = tp,
1435 tp = __tcf_get_next_proto(chain, tp),
12db03b6 1436 tcf_proto_put(tp_prev, true, NULL)) {
32636742
JH		 1437 if (tp->ops->reoffload) {
1438 err = tp->ops->reoffload(tp, add, cb, cb_priv,
1439 extack);
1440 if (err && add)
1441 goto err_playback_remove;
1442 } else if (add && offload_in_use) {
1443 err = -EOPNOTSUPP;
1444 NL_SET_ERR_MSG(extack, "Filter HW offload failed - classifier without re-offloading support");
1445 goto err_playback_remove;
1446 }
1447 }
1448 }
1449
1450 return 0;
1451
1452err_playback_remove:
12db03b6 1453 tcf_proto_put(tp, true, NULL);
bbf73830 1454 tcf_chain_put(chain);
32636742
JH		 1455 tcf_block_playback_offloads(block, cb, cb_priv, false, offload_in_use,
1456 extack);
1457 return err;
1458}
1459
59094b1e
PNA		 1460static int tcf_block_bind(struct tcf_block *block,
1461 struct flow_block_offload *bo)
1462{
1463 struct flow_block_cb *block_cb, *next;
1464 int err, i = 0;
1465
4f8116c8
VB		 1466 lockdep_assert_held(&block->cb_lock);
1467
59094b1e
PNA		 1468 list_for_each_entry(block_cb, &bo->cb_list, list) {
1469 err = tcf_block_playback_offloads(block, block_cb->cb,
1470 block_cb->cb_priv, true,
1471 tcf_block_offload_in_use(block),
1472 bo->extack);
1473 if (err)
1474 goto err_unroll;
c9f14470
VB		 1475 if (!bo->unlocked_driver_cb)
1476 block->lockeddevcnt++;
59094b1e
PNA		 1477
1478 i++;
1479 }
14bfb13f 1480 list_splice(&bo->cb_list, &block->flow_block.cb_list);
59094b1e
PNA		 1481
1482 return 0;
1483
1484err_unroll:
1485 list_for_each_entry_safe(block_cb, next, &bo->cb_list, list) {
1486 if (i-- > 0) {
1487 list_del(&block_cb->list);
1488 tcf_block_playback_offloads(block, block_cb->cb,
1489 block_cb->cb_priv, false,
1490 tcf_block_offload_in_use(block),
1491 NULL);
c9f14470
VB		 1492 if (!bo->unlocked_driver_cb)
1493 block->lockeddevcnt--;
59094b1e
PNA		 1494 }
1495 flow_block_cb_free(block_cb);
1496 }
1497
1498 return err;
1499}
1500
1501static void tcf_block_unbind(struct tcf_block *block,
1502 struct flow_block_offload *bo)
1503{
1504 struct flow_block_cb *block_cb, *next;
1505
4f8116c8
VB		 1506 lockdep_assert_held(&block->cb_lock);
1507
59094b1e
PNA		 1508 list_for_each_entry_safe(block_cb, next, &bo->cb_list, list) {
1509 tcf_block_playback_offloads(block, block_cb->cb,
1510 block_cb->cb_priv, false,
1511 tcf_block_offload_in_use(block),
1512 NULL);
1513 list_del(&block_cb->list);
1514 flow_block_cb_free(block_cb);
c9f14470
VB		 1515 if (!bo->unlocked_driver_cb)
1516 block->lockeddevcnt--;
59094b1e
PNA		 1517 }
1518}
1519
1520static int tcf_block_setup(struct tcf_block *block,
1521 struct flow_block_offload *bo)
1522{
1523 int err;
1524
1525 switch (bo->command) {
1526 case FLOW_BLOCK_BIND:
1527 err = tcf_block_bind(block, bo);
1528 break;
1529 case FLOW_BLOCK_UNBIND:
1530 err = 0;
1531 tcf_block_unbind(block, bo);
1532 break;
1533 default:
1534 WARN_ON_ONCE(1);
1535 err = -EOPNOTSUPP;
1536 }
1537
1538 return err;
1539}
1540
87d83093
JP		 1541/* Main classifier routine: scans classifier chain attached
1542 * to this qdisc, (optionally) tests for protocol and asks
1543 * specific classifiers.
1544 */
9410c940
PB		 1545static inline int __tcf_classify(struct sk_buff *skb,
1546 const struct tcf_proto *tp,
af699626 1547 const struct tcf_proto *orig_tp,
9410c940
PB		 1548 struct tcf_result *res,
1549 bool compat_mode,
1550 u32 *last_executed_chain)
87d83093 1551{
87d83093 1552#ifdef CONFIG_NET_CLS_ACT
05ff8435 1553 const int max_reclassify_loop = 16;
ee538dce 1554 const struct tcf_proto *first_tp;
87d83093
JP		 1555 int limit = 0;
1556
1557reclassify:
1558#endif
1559 for (; tp; tp = rcu_dereference_bh(tp->next)) {
d7bf2ebe 1560 __be16 protocol = skb_protocol(skb, false);
87d83093
JP		 1561 int err;
1562
1563 if (tp->protocol != protocol &&
1564 tp->protocol != htons(ETH_P_ALL))
1565 continue;
1566
1567 err = tp->classify(skb, tp, res);
1568#ifdef CONFIG_NET_CLS_ACT
db50514f 1569 if (unlikely(err == TC_ACT_RECLASSIFY && !compat_mode)) {
ee538dce 1570 first_tp = orig_tp;
9410c940 1571 *last_executed_chain = first_tp->chain->index;
87d83093 1572 goto reset;
db50514f 1573 } else if (unlikely(TC_ACT_EXT_CMP(err, TC_ACT_GOTO_CHAIN))) {
ee538dce 1574 first_tp = res->goto_tp;
9410c940 1575 *last_executed_chain = err & TC_ACT_EXT_VAL_MASK;
db50514f
JP		 1576 goto reset;
1577 }
87d83093
JP		 1578#endif
1579 if (err >= 0)
1580 return err;
1581 }
1582
1583 return TC_ACT_UNSPEC; /* signal: continue lookup */
1584#ifdef CONFIG_NET_CLS_ACT
1585reset:
1586 if (unlikely(limit++ >= max_reclassify_loop)) {
9d3aaff3
JP		 1587 net_notice_ratelimited("%u: reclassify loop, rule prio %u, protocol %02x\n",
1588 tp->chain->block->index,
1589 tp->prio & 0xffff,
87d83093
JP		 1590 ntohs(tp->protocol));
1591 return TC_ACT_SHOT;
1592 }
1593
ee538dce 1594 tp = first_tp;
87d83093
JP		 1595 goto reclassify;
1596#endif
1597}
9410c940 1598
3aa26055
DC		 1599int tcf_classify(struct sk_buff *skb,
1600 const struct tcf_block *block,
1601 const struct tcf_proto *tp,
9410c940 1602 struct tcf_result *res, bool compat_mode)
9410c940
PB		 1603{
1604#if !IS_ENABLED(CONFIG_NET_TC_SKB_EXT)
1605 u32 last_executed_chain = 0;
1606
af699626 1607 return __tcf_classify(skb, tp, tp, res, compat_mode,
9410c940
PB		 1608 &last_executed_chain);
1609#else
1610 u32 last_executed_chain = tp ? tp->chain->index : 0;
af699626 1611 const struct tcf_proto *orig_tp = tp;
9410c940
PB		 1612 struct tc_skb_ext *ext;
1613 int ret;
1614
3aa26055
DC		 1615 if (block) {
1616 ext = skb_ext_find(skb, TC_SKB_EXT);
af699626 1617
3aa26055
DC		 1618 if (ext && ext->chain) {
1619 struct tcf_chain *fchain;
af699626 1620
3aa26055
DC		 1621 fchain = tcf_chain_lookup_rcu(block, ext->chain);
1622 if (!fchain)
1623 return TC_ACT_SHOT;
af699626 1624
3aa26055
DC		 1625 /* Consume, so cloned/redirect skbs won't inherit ext */
1626 skb_ext_del(skb, TC_SKB_EXT);
af699626 1627
3aa26055
DC		 1628 tp = rcu_dereference_bh(fchain->filter_chain);
1629 last_executed_chain = fchain->index;
1630 }
af699626
PB		 1631 }
1632
1633 ret = __tcf_classify(skb, tp, orig_tp, res, compat_mode,
1634 &last_executed_chain);
9410c940 1635
35d39fec
PB		 1636 if (tc_skb_ext_tc_enabled()) {
1637 /* If we missed on some chain */
1638 if (ret == TC_ACT_UNSPEC && last_executed_chain) {
1639 struct tc_skb_cb *cb = tc_skb_cb(skb);
1640
1641 ext = tc_skb_ext_alloc(skb);
1642 if (WARN_ON_ONCE(!ext))
1643 return TC_ACT_SHOT;
1644 ext->chain = last_executed_chain;
1645 ext->mru = cb->mru;
1646 ext->post_ct = cb->post_ct;
1647 ext->post_ct_snat = cb->post_ct_snat;
1648 ext->post_ct_dnat = cb->post_ct_dnat;
1649 ext->zone = cb->zone;
1650 }
9410c940
PB		 1651 }
1652
1653 return ret;
1654#endif
1655}
3aa26055 1656EXPORT_SYMBOL(tcf_classify);
9410c940 1657
2190d1d0
JP		 1658struct tcf_chain_info {
1659 struct tcf_proto __rcu **pprev;
1660 struct tcf_proto __rcu *next;
1661};
1662
ed76f5ed
VB		 1663static struct tcf_proto *tcf_chain_tp_prev(struct tcf_chain *chain,
1664 struct tcf_chain_info *chain_info)
2190d1d0 1665{
ed76f5ed 1666 return tcf_chain_dereference(*chain_info->pprev, chain);
2190d1d0
JP		 1667}
1668
726d0612
VB		 1669static int tcf_chain_tp_insert(struct tcf_chain *chain,
1670 struct tcf_chain_info *chain_info,
1671 struct tcf_proto *tp)
2190d1d0 1672{
726d0612
VB		 1673 if (chain->flushing)
1674 return -EAGAIN;
1675
e65812fd 1676 RCU_INIT_POINTER(tp->next, tcf_chain_tp_prev(chain, chain_info));
c7eb7d72 1677 if (*chain_info->pprev == chain->filter_chain)
f71e0ca4 1678 tcf_chain0_head_change(chain, tp);
4dbfa766 1679 tcf_proto_get(tp);
2190d1d0 1680 rcu_assign_pointer(*chain_info->pprev, tp);
726d0612
VB		 1681
1682 return 0;
2190d1d0
JP		 1683}
1684
1685static void tcf_chain_tp_remove(struct tcf_chain *chain,
1686 struct tcf_chain_info *chain_info,
1687 struct tcf_proto *tp)
1688{
ed76f5ed 1689 struct tcf_proto *next = tcf_chain_dereference(chain_info->next, chain);
2190d1d0 1690
8b64678e 1691 tcf_proto_mark_delete(tp);
c7eb7d72 1692 if (tp == chain->filter_chain)
f71e0ca4 1693 tcf_chain0_head_change(chain, next);
2190d1d0
JP		 1694 RCU_INIT_POINTER(*chain_info->pprev, next);
1695}
1696
8b64678e
VB		 1697static struct tcf_proto *tcf_chain_tp_find(struct tcf_chain *chain,
1698 struct tcf_chain_info *chain_info,
1699 u32 protocol, u32 prio,
1700 bool prio_allocate);
1701
1702/* Try to insert new proto.
1703 * If proto with specified priority already exists, free new proto
1704 * and return existing one.
1705 */
1706
1707static struct tcf_proto *tcf_chain_tp_insert_unique(struct tcf_chain *chain,
1708 struct tcf_proto *tp_new,
12db03b6
VB		 1709 u32 protocol, u32 prio,
1710 bool rtnl_held)
8b64678e
VB		 1711{
1712 struct tcf_chain_info chain_info;
1713 struct tcf_proto *tp;
726d0612 1714 int err = 0;
8b64678e
VB		 1715
1716 mutex_lock(&chain->filter_chain_lock);
1717
59eb87cb
JH		 1718 if (tcf_proto_exists_destroying(chain, tp_new)) {
1719 mutex_unlock(&chain->filter_chain_lock);
1720 tcf_proto_destroy(tp_new, rtnl_held, false, NULL);
1721 return ERR_PTR(-EAGAIN);
1722 }
1723
8b64678e
VB		 1724 tp = tcf_chain_tp_find(chain, &chain_info,
1725 protocol, prio, false);
1726 if (!tp)
726d0612 1727 err = tcf_chain_tp_insert(chain, &chain_info, tp_new);
8b64678e
VB		 1728 mutex_unlock(&chain->filter_chain_lock);
1729
1730 if (tp) {
59eb87cb 1731 tcf_proto_destroy(tp_new, rtnl_held, false, NULL);
8b64678e 1732 tp_new = tp;
726d0612 1733 } else if (err) {
59eb87cb 1734 tcf_proto_destroy(tp_new, rtnl_held, false, NULL);
726d0612 1735 tp_new = ERR_PTR(err);
8b64678e
VB		 1736 }
1737
1738 return tp_new;
1739}
1740
1741static void tcf_chain_tp_delete_empty(struct tcf_chain *chain,
12db03b6 1742 struct tcf_proto *tp, bool rtnl_held,
8b64678e
VB		 1743 struct netlink_ext_ack *extack)
1744{
1745 struct tcf_chain_info chain_info;
1746 struct tcf_proto *tp_iter;
1747 struct tcf_proto **pprev;
1748 struct tcf_proto *next;
1749
1750 mutex_lock(&chain->filter_chain_lock);
1751
1752 /* Atomically find and remove tp from chain. */
1753 for (pprev = &chain->filter_chain;
1754 (tp_iter = tcf_chain_dereference(*pprev, chain));
1755 pprev = &tp_iter->next) {
1756 if (tp_iter == tp) {
1757 chain_info.pprev = pprev;
1758 chain_info.next = tp_iter->next;
1759 WARN_ON(tp_iter->deleting);
1760 break;
1761 }
1762 }
1763 /* Verify that tp still exists and no new filters were inserted
1764 * concurrently.
1765 * Mark tp for deletion if it is empty.
1766 */
a5b72a08 1767 if (!tp_iter || !tcf_proto_check_delete(tp)) {
8b64678e
VB		 1768 mutex_unlock(&chain->filter_chain_lock);
1769 return;
1770 }
1771
59eb87cb 1772 tcf_proto_signal_destroying(chain, tp);
8b64678e
VB		 1773 next = tcf_chain_dereference(chain_info.next, chain);
1774 if (tp == chain->filter_chain)
1775 tcf_chain0_head_change(chain, next);
1776 RCU_INIT_POINTER(*chain_info.pprev, next);
1777 mutex_unlock(&chain->filter_chain_lock);
1778
12db03b6 1779 tcf_proto_put(tp, rtnl_held, extack);
8b64678e
VB		 1780}
1781
2190d1d0
JP		 1782static struct tcf_proto *tcf_chain_tp_find(struct tcf_chain *chain,
1783 struct tcf_chain_info *chain_info,
1784 u32 protocol, u32 prio,
1785 bool prio_allocate)
1786{
1787 struct tcf_proto **pprev;
1788 struct tcf_proto *tp;
1789
1790 /* Check the chain for existence of proto-tcf with this priority */
1791 for (pprev = &chain->filter_chain;
ed76f5ed
VB		 1792 (tp = tcf_chain_dereference(*pprev, chain));
1793 pprev = &tp->next) {
2190d1d0
JP		 1794 if (tp->prio >= prio) {
1795 if (tp->prio == prio) {
1796 if (prio_allocate ||
1797 (tp->protocol != protocol && protocol))
1798 return ERR_PTR(-EINVAL);
1799 } else {
1800 tp = NULL;
1801 }
1802 break;
1803 }
1804 }
1805 chain_info->pprev = pprev;
4dbfa766
VB		 1806 if (tp) {
1807 chain_info->next = tp->next;
1808 tcf_proto_get(tp);
1809 } else {
1810 chain_info->next = NULL;
1811 }
2190d1d0
JP		 1812 return tp;
1813}
1814
7120371c 1815static int tcf_fill_node(struct net *net, struct sk_buff *skb,
7960d1da
JP		 1816 struct tcf_proto *tp, struct tcf_block *block,
1817 struct Qdisc *q, u32 parent, void *fh,
12db03b6 1818 u32 portid, u32 seq, u16 flags, int event,
f8ab1807 1819 bool terse_dump, bool rtnl_held)
7120371c
WC		 1820{
1821 struct tcmsg *tcm;
1822 struct nlmsghdr *nlh;
1823 unsigned char *b = skb_tail_pointer(skb);
1824
1825 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags);
1826 if (!nlh)
1827 goto out_nlmsg_trim;
1828 tcm = nlmsg_data(nlh);
1829 tcm->tcm_family = AF_UNSPEC;
1830 tcm->tcm__pad1 = 0;
1831 tcm->tcm__pad2 = 0;
7960d1da
JP		 1832 if (q) {
1833 tcm->tcm_ifindex = qdisc_dev(q)->ifindex;
1834 tcm->tcm_parent = parent;
1835 } else {
1836 tcm->tcm_ifindex = TCM_IFINDEX_MAGIC_BLOCK;
1837 tcm->tcm_block_index = block->index;
1838 }
7120371c
WC		 1839 tcm->tcm_info = TC_H_MAKE(tp->prio, tp->protocol);
1840 if (nla_put_string(skb, TCA_KIND, tp->ops->kind))
1841 goto nla_put_failure;
1842 if (nla_put_u32(skb, TCA_CHAIN, tp->chain->index))
1843 goto nla_put_failure;
1844 if (!fh) {
1845 tcm->tcm_handle = 0;
f8ab1807
VB		 1846 } else if (terse_dump) {
1847 if (tp->ops->terse_dump) {
1848 if (tp->ops->terse_dump(net, tp, fh, skb, tcm,
1849 rtnl_held) < 0)
1850 goto nla_put_failure;
1851 } else {
1852 goto cls_op_not_supp;
1853 }
7120371c 1854 } else {
12db03b6
VB		 1855 if (tp->ops->dump &&
1856 tp->ops->dump(net, tp, fh, skb, tcm, rtnl_held) < 0)
7120371c
WC		 1857 goto nla_put_failure;
1858 }
1859 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1860 return skb->len;
1861
1862out_nlmsg_trim:
1863nla_put_failure:
f8ab1807 1864cls_op_not_supp:
7120371c
WC		 1865 nlmsg_trim(skb, b);
1866 return -1;
1867}
1868
1869static int tfilter_notify(struct net *net, struct sk_buff *oskb,
1870 struct nlmsghdr *n, struct tcf_proto *tp,
7960d1da 1871 struct tcf_block *block, struct Qdisc *q,
12db03b6
VB		 1872 u32 parent, void *fh, int event, bool unicast,
1873 bool rtnl_held)
7120371c
WC		 1874{
1875 struct sk_buff *skb;
1876 u32 portid = oskb ? NETLINK_CB(oskb).portid : 0;
5b5f99b1 1877 int err = 0;
7120371c
WC		 1878
1879 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1880 if (!skb)
1881 return -ENOBUFS;
1882
7960d1da 1883 if (tcf_fill_node(net, skb, tp, block, q, parent, fh, portid,
12db03b6 1884 n->nlmsg_seq, n->nlmsg_flags, event,
f8ab1807 1885 false, rtnl_held) <= 0) {
7120371c
WC		 1886 kfree_skb(skb);
1887 return -EINVAL;
1888 }
1889
1890 if (unicast)
f79a3bcb 1891 err = rtnl_unicast(skb, net, portid);
5b5f99b1
ZW		 1892 else
1893 err = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
1894 n->nlmsg_flags & NLM_F_ECHO);
5b5f99b1 1895 return err;
7120371c
WC		 1896}
1897
1898static int tfilter_del_notify(struct net *net, struct sk_buff *oskb,
1899 struct nlmsghdr *n, struct tcf_proto *tp,
7960d1da 1900 struct tcf_block *block, struct Qdisc *q,
c35a4acc 1901 u32 parent, void *fh, bool unicast, bool *last,
12db03b6 1902 bool rtnl_held, struct netlink_ext_ack *extack)
7120371c
WC		 1903{
1904 struct sk_buff *skb;
1905 u32 portid = oskb ? NETLINK_CB(oskb).portid : 0;
1906 int err;
1907
1908 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1909 if (!skb)
1910 return -ENOBUFS;
1911
7960d1da 1912 if (tcf_fill_node(net, skb, tp, block, q, parent, fh, portid,
12db03b6 1913 n->nlmsg_seq, n->nlmsg_flags, RTM_DELTFILTER,
f8ab1807 1914 false, rtnl_held) <= 0) {
c35a4acc 1915 NL_SET_ERR_MSG(extack, "Failed to build del event notification");
7120371c
WC		 1916 kfree_skb(skb);
1917 return -EINVAL;
1918 }
1919
12db03b6 1920 err = tp->ops->delete(tp, fh, last, rtnl_held, extack);
7120371c
WC		 1921 if (err) {
1922 kfree_skb(skb);
1923 return err;
1924 }
1925
1926 if (unicast)
f79a3bcb 1927 err = rtnl_unicast(skb, net, portid);
5b5f99b1
ZW		 1928 else
1929 err = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
1930 n->nlmsg_flags & NLM_F_ECHO);
c35a4acc
AA		 1931 if (err < 0)
1932 NL_SET_ERR_MSG(extack, "Failed to send filter delete notification");
5b5f99b1 1933
c35a4acc 1934 return err;
7120371c
WC		 1935}
1936
1937static void tfilter_notify_chain(struct net *net, struct sk_buff *oskb,
7960d1da
JP		 1938 struct tcf_block *block, struct Qdisc *q,
1939 u32 parent, struct nlmsghdr *n,
0fca55ed 1940 struct tcf_chain *chain, int event)
7120371c
WC		 1941{
1942 struct tcf_proto *tp;
1943
0fca55ed
VB		 1944 for (tp = tcf_get_next_proto(chain, NULL);
1945 tp; tp = tcf_get_next_proto(chain, tp))
7960d1da 1946 tfilter_notify(net, oskb, n, tp, block,
0fca55ed 1947 q, parent, NULL, event, false, true);
7120371c
WC		 1948}
1949
7d5509fa
VB		 1950static void tfilter_put(struct tcf_proto *tp, void *fh)
1951{
1952 if (tp->ops->put && fh)
1953 tp->ops->put(tp, fh);
1954}
1955
c431f89b 1956static int tc_new_tfilter(struct sk_buff *skb, struct nlmsghdr *n,
c21ef3e3 1957 struct netlink_ext_ack *extack)
1da177e4 1958{
3b1e0a65 1959 struct net *net = sock_net(skb->sk);
add93b61 1960 struct nlattr *tca[TCA_MAX + 1];
6f96c3c6 1961 char name[IFNAMSIZ];
1da177e4
LT		 1962 struct tcmsg *t;
1963 u32 protocol;
1964 u32 prio;
9d36d9e5 1965 bool prio_allocate;
1da177e4 1966 u32 parent;
5bc17018 1967 u32 chain_index;
04c2a47f 1968 struct Qdisc *q;
2190d1d0 1969 struct tcf_chain_info chain_info;
04c2a47f 1970 struct tcf_chain *chain;
6529eaba 1971 struct tcf_block *block;
1da177e4 1972 struct tcf_proto *tp;
1da177e4 1973 unsigned long cl;
8113c095 1974 void *fh;
1da177e4 1975 int err;
628185cf 1976 int tp_created;
470502de 1977 bool rtnl_held = false;
a5397d68 1978 u32 flags;
1da177e4
LT		 1979
1980replay:
628185cf
DB		 1981 tp_created = 0;
1982
8cb08174
JB		 1983 err = nlmsg_parse_deprecated(n, sizeof(*t), tca, TCA_MAX,
1984 rtm_tca_policy, extack);
de179c8c
H		 1985 if (err < 0)
1986 return err;
1987
942b8165 1988 t = nlmsg_data(n);
1da177e4
LT		 1989 protocol = TC_H_MIN(t->tcm_info);
1990 prio = TC_H_MAJ(t->tcm_info);
9d36d9e5 1991 prio_allocate = false;
1da177e4 1992 parent = t->tcm_parent;
4dbfa766 1993 tp = NULL;
1da177e4 1994 cl = 0;
470502de 1995 block = NULL;
04c2a47f
ED		 1996 q = NULL;
1997 chain = NULL;
a5397d68 1998 flags = 0;
1da177e4
LT		 1999
2000 if (prio == 0) {
c431f89b
VB		 2001 /* If no priority is provided by the user,
2002 * we allocate one.
2003 */
2004 if (n->nlmsg_flags & NLM_F_CREATE) {
2005 prio = TC_H_MAKE(0x80000000U, 0U);
2006 prio_allocate = true;
2007 } else {
c35a4acc 2008 NL_SET_ERR_MSG(extack, "Invalid filter command with priority of zero");
1da177e4 2009 return -ENOENT;
ea7f8277 2010 }
1da177e4
LT		 2011 }
2012
2013 /* Find head of filter chain. */
2014
470502de
VB		 2015 err = __tcf_qdisc_find(net, &q, &parent, t->tcm_ifindex, false, extack);
2016 if (err)
2017 return err;
2018
6f96c3c6
CW		 2019 if (tcf_proto_check_kind(tca[TCA_KIND], name)) {
2020 NL_SET_ERR_MSG(extack, "Specified TC filter name too long");
2021 err = -EINVAL;
2022 goto errout;
2023 }
2024
470502de
VB		 2025 /* Take rtnl mutex if rtnl_held was set to true on previous iteration,
2026 * block is shared (no qdisc found), qdisc is not unlocked, classifier
2027 * type is not specified, classifier is not unlocked.
2028 */
2029 if (rtnl_held ||
2030 (q && !(q->ops->cl_ops->flags & QDISC_CLASS_OPS_DOIT_UNLOCKED)) ||
6f96c3c6 2031 !tcf_proto_is_unlocked(name)) {
470502de
VB		 2032 rtnl_held = true;
2033 rtnl_lock();
2034 }
2035
2036 err = __tcf_qdisc_cl_find(q, parent, &cl, t->tcm_ifindex, extack);
2037 if (err)
2038 goto errout;
2039
2040 block = __tcf_block_find(net, q, cl, t->tcm_ifindex, t->tcm_block_index,
2041 extack);
c431f89b
VB		 2042 if (IS_ERR(block)) {
2043 err = PTR_ERR(block);
2044 goto errout;
6bb16e7a 2045 }
a7df4870 2046 block->classid = parent;
5bc17018
JP		 2047
2048 chain_index = tca[TCA_CHAIN] ? nla_get_u32(tca[TCA_CHAIN]) : 0;
2049 if (chain_index > TC_ACT_EXT_VAL_MASK) {
c35a4acc 2050 NL_SET_ERR_MSG(extack, "Specified chain index exceeds upper limit");
5bc17018
JP		 2051 err = -EINVAL;
2052 goto errout;
2053 }
c431f89b 2054 chain = tcf_chain_get(block, chain_index, true);
5bc17018 2055 if (!chain) {
d5ed72a5 2056 NL_SET_ERR_MSG(extack, "Cannot create specified filter chain");
c431f89b 2057 err = -ENOMEM;
ea7f8277
DB		 2058 goto errout;
2059 }
1da177e4 2060
ed76f5ed 2061 mutex_lock(&chain->filter_chain_lock);
2190d1d0
JP		 2062 tp = tcf_chain_tp_find(chain, &chain_info, protocol,
2063 prio, prio_allocate);
2064 if (IS_ERR(tp)) {
c35a4acc 2065 NL_SET_ERR_MSG(extack, "Filter with specified priority/protocol not found");
2190d1d0 2066 err = PTR_ERR(tp);
ed76f5ed 2067 goto errout_locked;
1da177e4
LT		 2068 }
2069
2070 if (tp == NULL) {
8b64678e
VB		 2071 struct tcf_proto *tp_new = NULL;
2072
726d0612
VB		 2073 if (chain->flushing) {
2074 err = -EAGAIN;
2075 goto errout_locked;
2076 }
2077
1da177e4
LT		 2078 /* Proto-tcf does not exist, create new one */
2079
6bb16e7a 2080 if (tca[TCA_KIND] == NULL || !protocol) {
c35a4acc 2081 NL_SET_ERR_MSG(extack, "Filter kind and protocol must be specified");
6bb16e7a 2082 err = -EINVAL;
ed76f5ed 2083 goto errout_locked;
6bb16e7a 2084 }
1da177e4 2085
c431f89b 2086 if (!(n->nlmsg_flags & NLM_F_CREATE)) {
c35a4acc 2087 NL_SET_ERR_MSG(extack, "Need both RTM_NEWTFILTER and NLM_F_CREATE to create a new filter");
6bb16e7a 2088 err = -ENOENT;
ed76f5ed 2089 goto errout_locked;
6bb16e7a 2090 }
1da177e4 2091
9d36d9e5 2092 if (prio_allocate)
ed76f5ed
VB		 2093 prio = tcf_auto_prio(tcf_chain_tp_prev(chain,
2094 &chain_info));
1da177e4 2095
ed76f5ed 2096 mutex_unlock(&chain->filter_chain_lock);
36d79af7
ED		 2097 tp_new = tcf_proto_create(name, protocol, prio, chain,
2098 rtnl_held, extack);
8b64678e
VB		 2099 if (IS_ERR(tp_new)) {
2100 err = PTR_ERR(tp_new);
726d0612 2101 goto errout_tp;
1da177e4 2102 }
ed76f5ed 2103
12186be7 2104 tp_created = 1;
12db03b6
VB		 2105 tp = tcf_chain_tp_insert_unique(chain, tp_new, protocol, prio,
2106 rtnl_held);
726d0612
VB		 2107 if (IS_ERR(tp)) {
2108 err = PTR_ERR(tp);
2109 goto errout_tp;
2110 }
ed76f5ed
VB		 2111 } else {
2112 mutex_unlock(&chain->filter_chain_lock);
6bb16e7a 2113 }
1da177e4 2114
8b64678e
VB		 2115 if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], tp->ops->kind)) {
2116 NL_SET_ERR_MSG(extack, "Specified filter kind does not match existing one");
2117 err = -EINVAL;
2118 goto errout;
2119 }
2120
1da177e4
LT		 2121 fh = tp->ops->get(tp, t->tcm_handle);
2122
8113c095 2123 if (!fh) {
c431f89b 2124 if (!(n->nlmsg_flags & NLM_F_CREATE)) {
c35a4acc 2125 NL_SET_ERR_MSG(extack, "Need both RTM_NEWTFILTER and NLM_F_CREATE to create a new filter");
6bb16e7a 2126 err = -ENOENT;
1da177e4 2127 goto errout;
6bb16e7a 2128 }
c431f89b 2129 } else if (n->nlmsg_flags & NLM_F_EXCL) {
7d5509fa 2130 tfilter_put(tp, fh);
c431f89b
VB		 2131 NL_SET_ERR_MSG(extack, "Filter already exists");
2132 err = -EEXIST;
2133 goto errout;
1da177e4
LT		 2134 }
2135
9f407f17 2136 if (chain->tmplt_ops && chain->tmplt_ops != tp->ops) {
c2e1cfef 2137 tfilter_put(tp, fh);
9f407f17
JP		 2138 NL_SET_ERR_MSG(extack, "Chain template is set to a different filter kind");
2139 err = -EINVAL;
2140 goto errout;
2141 }
2142
695176bf
CW		 2143 if (!(n->nlmsg_flags & NLM_F_CREATE))
2144 flags |= TCA_ACT_FLAGS_REPLACE;
2145 if (!rtnl_held)
2146 flags |= TCA_ACT_FLAGS_NO_RTNL;
2f7ef2f8 2147 err = tp->ops->change(net, skb, tp, cl, t->tcm_handle, tca, &fh,
695176bf 2148 flags, extack);
7d5509fa 2149 if (err == 0) {
7960d1da 2150 tfilter_notify(net, skb, n, tp, block, q, parent, fh,
12db03b6 2151 RTM_NEWTFILTER, false, rtnl_held);
7d5509fa 2152 tfilter_put(tp, fh);
503d81d4
VB		 2153 /* q pointer is NULL for shared blocks */
2154 if (q)
2155 q->flags &= ~TCQ_F_CAN_BYPASS;
7d5509fa 2156 }
1da177e4
LT		 2157
2158errout:
8b64678e 2159 if (err && tp_created)
12db03b6 2160 tcf_chain_tp_delete_empty(chain, tp, rtnl_held, NULL);
726d0612 2161errout_tp:
4dbfa766
VB		 2162 if (chain) {
2163 if (tp && !IS_ERR(tp))
12db03b6 2164 tcf_proto_put(tp, rtnl_held, NULL);
4dbfa766
VB		 2165 if (!tp_created)
2166 tcf_chain_put(chain);
2167 }
12db03b6 2168 tcf_block_release(q, block, rtnl_held);
470502de
VB		 2169
2170 if (rtnl_held)
2171 rtnl_unlock();
2172
2173 if (err == -EAGAIN) {
2174 /* Take rtnl lock in case EAGAIN is caused by concurrent flush
2175 * of target chain.
2176 */
2177 rtnl_held = true;
1da177e4
LT		 2178 /* Replay the request. */
2179 goto replay;
470502de 2180 }
1da177e4 2181 return err;
ed76f5ed
VB		 2182
2183errout_locked:
2184 mutex_unlock(&chain->filter_chain_lock);
2185 goto errout;
1da177e4
LT		 2186}
2187
c431f89b
VB		 2188static int tc_del_tfilter(struct sk_buff *skb, struct nlmsghdr *n,
2189 struct netlink_ext_ack *extack)
2190{
2191 struct net *net = sock_net(skb->sk);
2192 struct nlattr *tca[TCA_MAX + 1];
6f96c3c6 2193 char name[IFNAMSIZ];
c431f89b
VB		 2194 struct tcmsg *t;
2195 u32 protocol;
2196 u32 prio;
2197 u32 parent;
2198 u32 chain_index;
2199 struct Qdisc *q = NULL;
2200 struct tcf_chain_info chain_info;
2201 struct tcf_chain *chain = NULL;
470502de 2202 struct tcf_block *block = NULL;
c431f89b
VB		 2203 struct tcf_proto *tp = NULL;
2204 unsigned long cl = 0;
2205 void *fh = NULL;
2206 int err;
470502de 2207 bool rtnl_held = false;
c431f89b 2208
8cb08174
JB		 2209 err = nlmsg_parse_deprecated(n, sizeof(*t), tca, TCA_MAX,
2210 rtm_tca_policy, extack);
c431f89b
VB		 2211 if (err < 0)
2212 return err;
2213
2214 t = nlmsg_data(n);
2215 protocol = TC_H_MIN(t->tcm_info);
2216 prio = TC_H_MAJ(t->tcm_info);
2217 parent = t->tcm_parent;
2218
2219 if (prio == 0 && (protocol || t->tcm_handle || tca[TCA_KIND])) {
2220 NL_SET_ERR_MSG(extack, "Cannot flush filters with protocol, handle or kind set");
2221 return -ENOENT;
2222 }
2223
2224 /* Find head of filter chain. */
2225
470502de
VB		 2226 err = __tcf_qdisc_find(net, &q, &parent, t->tcm_ifindex, false, extack);
2227 if (err)
2228 return err;
2229
6f96c3c6
CW		 2230 if (tcf_proto_check_kind(tca[TCA_KIND], name)) {
2231 NL_SET_ERR_MSG(extack, "Specified TC filter name too long");
2232 err = -EINVAL;
2233 goto errout;
2234 }
470502de
VB		 2235 /* Take rtnl mutex if flushing whole chain, block is shared (no qdisc
2236 * found), qdisc is not unlocked, classifier type is not specified,
2237 * classifier is not unlocked.
2238 */
2239 if (!prio ||
2240 (q && !(q->ops->cl_ops->flags & QDISC_CLASS_OPS_DOIT_UNLOCKED)) ||
6f96c3c6 2241 !tcf_proto_is_unlocked(name)) {
470502de
VB		 2242 rtnl_held = true;
2243 rtnl_lock();
2244 }
2245
2246 err = __tcf_qdisc_cl_find(q, parent, &cl, t->tcm_ifindex, extack);
2247 if (err)
2248 goto errout;
2249
2250 block = __tcf_block_find(net, q, cl, t->tcm_ifindex, t->tcm_block_index,
2251 extack);
c431f89b
VB		 2252 if (IS_ERR(block)) {
2253 err = PTR_ERR(block);
2254 goto errout;
2255 }
2256
2257 chain_index = tca[TCA_CHAIN] ? nla_get_u32(tca[TCA_CHAIN]) : 0;
2258 if (chain_index > TC_ACT_EXT_VAL_MASK) {
2259 NL_SET_ERR_MSG(extack, "Specified chain index exceeds upper limit");
2260 err = -EINVAL;
2261 goto errout;
2262 }
2263 chain = tcf_chain_get(block, chain_index, false);
2264 if (!chain) {
5ca8a25c
JP		 2265 /* User requested flush on non-existent chain. Nothing to do,
2266 * so just return success.
2267 */
2268 if (prio == 0) {
2269 err = 0;
2270 goto errout;
2271 }
c431f89b 2272 NL_SET_ERR_MSG(extack, "Cannot find specified filter chain");
b7b4247d 2273 err = -ENOENT;
c431f89b
VB		 2274 goto errout;
2275 }
2276
2277 if (prio == 0) {
2278 tfilter_notify_chain(net, skb, block, q, parent, n,
0fca55ed 2279 chain, RTM_DELTFILTER);
12db03b6 2280 tcf_chain_flush(chain, rtnl_held);
c431f89b
VB		 2281 err = 0;
2282 goto errout;
2283 }
2284
ed76f5ed 2285 mutex_lock(&chain->filter_chain_lock);
c431f89b
VB		 2286 tp = tcf_chain_tp_find(chain, &chain_info, protocol,
2287 prio, false);
2288 if (!tp || IS_ERR(tp)) {
2289 NL_SET_ERR_MSG(extack, "Filter with specified priority/protocol not found");
0e399035 2290 err = tp ? PTR_ERR(tp) : -ENOENT;
ed76f5ed 2291 goto errout_locked;
c431f89b
VB		 2292 } else if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], tp->ops->kind)) {
2293 NL_SET_ERR_MSG(extack, "Specified filter kind does not match existing one");
2294 err = -EINVAL;
ed76f5ed
VB		 2295 goto errout_locked;
2296 } else if (t->tcm_handle == 0) {
59eb87cb 2297 tcf_proto_signal_destroying(chain, tp);
ed76f5ed
VB		 2298 tcf_chain_tp_remove(chain, &chain_info, tp);
2299 mutex_unlock(&chain->filter_chain_lock);
2300
12db03b6 2301 tcf_proto_put(tp, rtnl_held, NULL);
ed76f5ed 2302 tfilter_notify(net, skb, n, tp, block, q, parent, fh,
12db03b6 2303 RTM_DELTFILTER, false, rtnl_held);
ed76f5ed 2304 err = 0;
c431f89b
VB		 2305 goto errout;
2306 }
ed76f5ed 2307 mutex_unlock(&chain->filter_chain_lock);
c431f89b
VB		 2308
2309 fh = tp->ops->get(tp, t->tcm_handle);
2310
2311 if (!fh) {
ed76f5ed
VB		 2312 NL_SET_ERR_MSG(extack, "Specified filter handle not found");
2313 err = -ENOENT;
c431f89b
VB		 2314 } else {
2315 bool last;
2316
2317 err = tfilter_del_notify(net, skb, n, tp, block,
2318 q, parent, fh, false, &last,
12db03b6
VB		 2319 rtnl_held, extack);
2320
c431f89b
VB		 2321 if (err)
2322 goto errout;
8b64678e 2323 if (last)
12db03b6 2324 tcf_chain_tp_delete_empty(chain, tp, rtnl_held, extack);
c431f89b
VB		 2325 }
2326
2327errout:
4dbfa766
VB		 2328 if (chain) {
2329 if (tp && !IS_ERR(tp))
12db03b6 2330 tcf_proto_put(tp, rtnl_held, NULL);
c431f89b 2331 tcf_chain_put(chain);
4dbfa766 2332 }
12db03b6 2333 tcf_block_release(q, block, rtnl_held);
470502de
VB		 2334
2335 if (rtnl_held)
2336 rtnl_unlock();
2337
c431f89b 2338 return err;
ed76f5ed
VB		 2339
2340errout_locked:
2341 mutex_unlock(&chain->filter_chain_lock);
2342 goto errout;
c431f89b
VB		 2343}
2344
2345static int tc_get_tfilter(struct sk_buff *skb, struct nlmsghdr *n,
2346 struct netlink_ext_ack *extack)
2347{
2348 struct net *net = sock_net(skb->sk);
2349 struct nlattr *tca[TCA_MAX + 1];
6f96c3c6 2350 char name[IFNAMSIZ];
c431f89b
VB		 2351 struct tcmsg *t;
2352 u32 protocol;
2353 u32 prio;
2354 u32 parent;
2355 u32 chain_index;
2356 struct Qdisc *q = NULL;
2357 struct tcf_chain_info chain_info;
2358 struct tcf_chain *chain = NULL;
470502de 2359 struct tcf_block *block = NULL;
c431f89b
VB		 2360 struct tcf_proto *tp = NULL;
2361 unsigned long cl = 0;
2362 void *fh = NULL;
2363 int err;
470502de 2364 bool rtnl_held = false;
c431f89b 2365
8cb08174
JB		 2366 err = nlmsg_parse_deprecated(n, sizeof(*t), tca, TCA_MAX,
2367 rtm_tca_policy, extack);
c431f89b
VB		 2368 if (err < 0)
2369 return err;
2370
2371 t = nlmsg_data(n);
2372 protocol = TC_H_MIN(t->tcm_info);
2373 prio = TC_H_MAJ(t->tcm_info);
2374 parent = t->tcm_parent;
2375
2376 if (prio == 0) {
2377 NL_SET_ERR_MSG(extack, "Invalid filter command with priority of zero");
2378 return -ENOENT;
2379 }
2380
2381 /* Find head of filter chain. */
2382
470502de
VB		 2383 err = __tcf_qdisc_find(net, &q, &parent, t->tcm_ifindex, false, extack);
2384 if (err)
2385 return err;
2386
6f96c3c6
CW		 2387 if (tcf_proto_check_kind(tca[TCA_KIND], name)) {
2388 NL_SET_ERR_MSG(extack, "Specified TC filter name too long");
2389 err = -EINVAL;
2390 goto errout;
2391 }
470502de
VB		 2392 /* Take rtnl mutex if block is shared (no qdisc found), qdisc is not
2393 * unlocked, classifier type is not specified, classifier is not
2394 * unlocked.
2395 */
2396 if ((q && !(q->ops->cl_ops->flags & QDISC_CLASS_OPS_DOIT_UNLOCKED)) ||
6f96c3c6 2397 !tcf_proto_is_unlocked(name)) {
470502de
VB		 2398 rtnl_held = true;
2399 rtnl_lock();
2400 }
2401
2402 err = __tcf_qdisc_cl_find(q, parent, &cl, t->tcm_ifindex, extack);
2403 if (err)
2404 goto errout;
2405
2406 block = __tcf_block_find(net, q, cl, t->tcm_ifindex, t->tcm_block_index,
2407 extack);
c431f89b
VB		 2408 if (IS_ERR(block)) {
2409 err = PTR_ERR(block);
2410 goto errout;
2411 }
2412
2413 chain_index = tca[TCA_CHAIN] ? nla_get_u32(tca[TCA_CHAIN]) : 0;
2414 if (chain_index > TC_ACT_EXT_VAL_MASK) {
2415 NL_SET_ERR_MSG(extack, "Specified chain index exceeds upper limit");
2416 err = -EINVAL;
2417 goto errout;
2418 }
2419 chain = tcf_chain_get(block, chain_index, false);
2420 if (!chain) {
2421 NL_SET_ERR_MSG(extack, "Cannot find specified filter chain");
2422 err = -EINVAL;
2423 goto errout;
2424 }
2425
ed76f5ed 2426 mutex_lock(&chain->filter_chain_lock);
c431f89b
VB		 2427 tp = tcf_chain_tp_find(chain, &chain_info, protocol,
2428 prio, false);
ed76f5ed 2429 mutex_unlock(&chain->filter_chain_lock);
c431f89b
VB		 2430 if (!tp || IS_ERR(tp)) {
2431 NL_SET_ERR_MSG(extack, "Filter with specified priority/protocol not found");
0e399035 2432 err = tp ? PTR_ERR(tp) : -ENOENT;
c431f89b
VB		 2433 goto errout;
2434 } else if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], tp->ops->kind)) {
2435 NL_SET_ERR_MSG(extack, "Specified filter kind does not match existing one");
2436 err = -EINVAL;
2437 goto errout;
2438 }
2439
2440 fh = tp->ops->get(tp, t->tcm_handle);
2441
2442 if (!fh) {
2443 NL_SET_ERR_MSG(extack, "Specified filter handle not found");
2444 err = -ENOENT;
2445 } else {
2446 err = tfilter_notify(net, skb, n, tp, block, q, parent,
12db03b6 2447 fh, RTM_NEWTFILTER, true, rtnl_held);
c431f89b
VB		 2448 if (err < 0)
2449 NL_SET_ERR_MSG(extack, "Failed to send filter notify message");
2450 }
2451
7d5509fa 2452 tfilter_put(tp, fh);
c431f89b 2453errout:
4dbfa766
VB		 2454 if (chain) {
2455 if (tp && !IS_ERR(tp))
12db03b6 2456 tcf_proto_put(tp, rtnl_held, NULL);
c431f89b 2457 tcf_chain_put(chain);
4dbfa766 2458 }
12db03b6 2459 tcf_block_release(q, block, rtnl_held);
470502de
VB		 2460
2461 if (rtnl_held)
2462 rtnl_unlock();
2463
c431f89b
VB		 2464 return err;
2465}
2466
aa767bfe 2467struct tcf_dump_args {
1da177e4
LT		 2468 struct tcf_walker w;
2469 struct sk_buff *skb;
2470 struct netlink_callback *cb;
7960d1da 2471 struct tcf_block *block;
a10fa201
JP		 2472 struct Qdisc *q;
2473 u32 parent;
f8ab1807 2474 bool terse_dump;
1da177e4
LT		 2475};
2476
8113c095 2477static int tcf_node_dump(struct tcf_proto *tp, void *n, struct tcf_walker *arg)
1da177e4 2478{
aa767bfe 2479 struct tcf_dump_args *a = (void *)arg;
832d1d5b 2480 struct net *net = sock_net(a->skb->sk);
1da177e4 2481
7960d1da 2482 return tcf_fill_node(net, a->skb, tp, a->block, a->q, a->parent,
a10fa201 2483 n, NETLINK_CB(a->cb->skb).portid,
5a7a5555 2484 a->cb->nlh->nlmsg_seq, NLM_F_MULTI,
f8ab1807 2485 RTM_NEWTFILTER, a->terse_dump, true);
1da177e4
LT		 2486}
2487
a10fa201
JP		 2488static bool tcf_chain_dump(struct tcf_chain *chain, struct Qdisc *q, u32 parent,
2489 struct sk_buff *skb, struct netlink_callback *cb,
f8ab1807 2490 long index_start, long *p_index, bool terse)
acb31fae
JP		 2491{
2492 struct net *net = sock_net(skb->sk);
7960d1da 2493 struct tcf_block *block = chain->block;
acb31fae 2494 struct tcmsg *tcm = nlmsg_data(cb->nlh);
fe2923af 2495 struct tcf_proto *tp, *tp_prev;
acb31fae 2496 struct tcf_dump_args arg;
acb31fae 2497
fe2923af
VB		 2498 for (tp = __tcf_get_next_proto(chain, NULL);
2499 tp;
2500 tp_prev = tp,
2501 tp = __tcf_get_next_proto(chain, tp),
12db03b6 2502 tcf_proto_put(tp_prev, true, NULL),
fe2923af 2503 (*p_index)++) {
acb31fae
JP		 2504 if (*p_index < index_start)
2505 continue;
2506 if (TC_H_MAJ(tcm->tcm_info) &&
2507 TC_H_MAJ(tcm->tcm_info) != tp->prio)
2508 continue;
2509 if (TC_H_MIN(tcm->tcm_info) &&
2510 TC_H_MIN(tcm->tcm_info) != tp->protocol)
2511 continue;
2512 if (*p_index > index_start)
2513 memset(&cb->args[1], 0,
2514 sizeof(cb->args) - sizeof(cb->args[0]));
2515 if (cb->args[1] == 0) {
53189183 2516 if (tcf_fill_node(net, skb, tp, block, q, parent, NULL,
acb31fae
JP		 2517 NETLINK_CB(cb->skb).portid,
2518 cb->nlh->nlmsg_seq, NLM_F_MULTI,
f8ab1807 2519 RTM_NEWTFILTER, false, true) <= 0)
fe2923af 2520 goto errout;
acb31fae
JP		 2521 cb->args[1] = 1;
2522 }
2523 if (!tp->ops->walk)
2524 continue;
2525 arg.w.fn = tcf_node_dump;
2526 arg.skb = skb;
2527 arg.cb = cb;
7960d1da 2528 arg.block = block;
a10fa201
JP		 2529 arg.q = q;
2530 arg.parent = parent;
acb31fae
JP		 2531 arg.w.stop = 0;
2532 arg.w.skip = cb->args[1] - 1;
2533 arg.w.count = 0;
01683a14 2534 arg.w.cookie = cb->args[2];
f8ab1807 2535 arg.terse_dump = terse;
12db03b6 2536 tp->ops->walk(tp, &arg.w, true);
01683a14 2537 cb->args[2] = arg.w.cookie;
acb31fae
JP		 2538 cb->args[1] = arg.w.count + 1;
2539 if (arg.w.stop)
fe2923af 2540 goto errout;
acb31fae 2541 }
5bc17018 2542 return true;
fe2923af
VB		 2543
2544errout:
12db03b6 2545 tcf_proto_put(tp, true, NULL);
fe2923af 2546 return false;
acb31fae
JP		 2547}
2548
f8ab1807
VB		 2549static const struct nla_policy tcf_tfilter_dump_policy[TCA_MAX + 1] = {
2550 [TCA_DUMP_FLAGS] = NLA_POLICY_BITFIELD32(TCA_DUMP_FLAGS_TERSE),
2551};
2552
bd27a875 2553/* called with RTNL */
1da177e4
LT		 2554static int tc_dump_tfilter(struct sk_buff *skb, struct netlink_callback *cb)
2555{
bbf73830 2556 struct tcf_chain *chain, *chain_prev;
3b1e0a65 2557 struct net *net = sock_net(skb->sk);
5bc17018 2558 struct nlattr *tca[TCA_MAX + 1];
7960d1da 2559 struct Qdisc *q = NULL;
6529eaba 2560 struct tcf_block *block;
942b8165 2561 struct tcmsg *tcm = nlmsg_data(cb->nlh);
f8ab1807 2562 bool terse_dump = false;
acb31fae
JP		 2563 long index_start;
2564 long index;
a10fa201 2565 u32 parent;
5bc17018 2566 int err;
1da177e4 2567
573ce260 2568 if (nlmsg_len(cb->nlh) < sizeof(*tcm))
1da177e4 2569 return skb->len;
5bc17018 2570
8cb08174 2571 err = nlmsg_parse_deprecated(cb->nlh, sizeof(*tcm), tca, TCA_MAX,
f8ab1807 2572 tcf_tfilter_dump_policy, cb->extack);
5bc17018
JP		 2573 if (err)
2574 return err;
2575
f8ab1807
VB		 2576 if (tca[TCA_DUMP_FLAGS]) {
2577 struct nla_bitfield32 flags =
2578 nla_get_bitfield32(tca[TCA_DUMP_FLAGS]);
2579
2580 terse_dump = flags.value & TCA_DUMP_FLAGS_TERSE;
2581 }
2582
7960d1da 2583 if (tcm->tcm_ifindex == TCM_IFINDEX_MAGIC_BLOCK) {
787ce6d0 2584 block = tcf_block_refcnt_get(net, tcm->tcm_block_index);
7960d1da
JP		 2585 if (!block)
2586 goto out;
d680b352
JP		 2587 /* If we work with block index, q is NULL and parent value
2588 * will never be used in the following code. The check
2589 * in tcf_fill_node prevents it. However, compiler does not
2590 * see that far, so set parent to zero to silence the warning
2591 * about parent being uninitialized.
2592 */
2593 parent = 0;
a10fa201 2594 } else {
7960d1da
JP		 2595 const struct Qdisc_class_ops *cops;
2596 struct net_device *dev;
2597 unsigned long cl = 0;
2598
2599 dev = __dev_get_by_index(net, tcm->tcm_ifindex);
2600 if (!dev)
2601 return skb->len;
2602
2603 parent = tcm->tcm_parent;
a7df4870 2604 if (!parent)
5891cd5e 2605 q = rtnl_dereference(dev->qdisc);
a7df4870 2606 else
7960d1da 2607 q = qdisc_lookup(dev, TC_H_MAJ(tcm->tcm_parent));
7960d1da
JP		 2608 if (!q)
2609 goto out;
2610 cops = q->ops->cl_ops;
2611 if (!cops)
143976ce 2612 goto out;
7960d1da
JP		 2613 if (!cops->tcf_block)
2614 goto out;
2615 if (TC_H_MIN(tcm->tcm_parent)) {
2616 cl = cops->find(q, tcm->tcm_parent);
2617 if (cl == 0)
2618 goto out;
2619 }
2620 block = cops->tcf_block(q, cl, NULL);
2621 if (!block)
2622 goto out;
a7df4870 2623 parent = block->classid;
7960d1da
JP		 2624 if (tcf_block_shared(block))
2625 q = NULL;
1da177e4 2626 }
1da177e4 2627
acb31fae
JP		 2628 index_start = cb->args[0];
2629 index = 0;
5bc17018 2630
bbf73830
VB		 2631 for (chain = __tcf_get_next_chain(block, NULL);
2632 chain;
2633 chain_prev = chain,
2634 chain = __tcf_get_next_chain(block, chain),
2635 tcf_chain_put(chain_prev)) {
5bc17018
JP		 2636 if (tca[TCA_CHAIN] &&
2637 nla_get_u32(tca[TCA_CHAIN]) != chain->index)
2638 continue;
a10fa201 2639 if (!tcf_chain_dump(chain, q, parent, skb, cb,
f8ab1807 2640 index_start, &index, terse_dump)) {
bbf73830 2641 tcf_chain_put(chain);
5ae437ad 2642 err = -EMSGSIZE;
5bc17018 2643 break;
5ae437ad 2644 }
5bc17018
JP		 2645 }
2646
787ce6d0 2647 if (tcm->tcm_ifindex == TCM_IFINDEX_MAGIC_BLOCK)
12db03b6 2648 tcf_block_refcnt_put(block, true);
acb31fae 2649 cb->args[0] = index;
1da177e4 2650
1da177e4 2651out:
5ae437ad
RK		 2652 /* If we did no progress, the error (EMSGSIZE) is real */
2653 if (skb->len == 0 && err)
2654 return err;
1da177e4
LT		 2655 return skb->len;
2656}
2657
a5654820
VB		 2658static int tc_chain_fill_node(const struct tcf_proto_ops *tmplt_ops,
2659 void *tmplt_priv, u32 chain_index,
2660 struct net *net, struct sk_buff *skb,
2661 struct tcf_block *block,
32a4f5ec
JP		 2662 u32 portid, u32 seq, u16 flags, int event)
2663{
2664 unsigned char *b = skb_tail_pointer(skb);
9f407f17 2665 const struct tcf_proto_ops *ops;
32a4f5ec
JP		 2666 struct nlmsghdr *nlh;
2667 struct tcmsg *tcm;
9f407f17
JP		 2668 void *priv;
2669
a5654820
VB		 2670 ops = tmplt_ops;
2671 priv = tmplt_priv;
32a4f5ec
JP		 2672
2673 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags);
2674 if (!nlh)
2675 goto out_nlmsg_trim;
2676 tcm = nlmsg_data(nlh);
2677 tcm->tcm_family = AF_UNSPEC;
2678 tcm->tcm__pad1 = 0;
2679 tcm->tcm__pad2 = 0;
2680 tcm->tcm_handle = 0;
2681 if (block->q) {
2682 tcm->tcm_ifindex = qdisc_dev(block->q)->ifindex;
2683 tcm->tcm_parent = block->q->handle;
2684 } else {
2685 tcm->tcm_ifindex = TCM_IFINDEX_MAGIC_BLOCK;
2686 tcm->tcm_block_index = block->index;
2687 }
2688
a5654820 2689 if (nla_put_u32(skb, TCA_CHAIN, chain_index))
32a4f5ec
JP		 2690 goto nla_put_failure;
2691
9f407f17
JP		 2692 if (ops) {
2693 if (nla_put_string(skb, TCA_KIND, ops->kind))
2694 goto nla_put_failure;
2695 if (ops->tmplt_dump(skb, net, priv) < 0)
2696 goto nla_put_failure;
2697 }
2698
32a4f5ec
JP		 2699 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
2700 return skb->len;
2701
2702out_nlmsg_trim:
2703nla_put_failure:
2704 nlmsg_trim(skb, b);
2705 return -EMSGSIZE;
2706}
2707
2708static int tc_chain_notify(struct tcf_chain *chain, struct sk_buff *oskb,
2709 u32 seq, u16 flags, int event, bool unicast)
2710{
2711 u32 portid = oskb ? NETLINK_CB(oskb).portid : 0;
2712 struct tcf_block *block = chain->block;
2713 struct net *net = block->net;
2714 struct sk_buff *skb;
5b5f99b1 2715 int err = 0;
32a4f5ec
JP		 2716
2717 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2718 if (!skb)
2719 return -ENOBUFS;
2720
a5654820
VB		 2721 if (tc_chain_fill_node(chain->tmplt_ops, chain->tmplt_priv,
2722 chain->index, net, skb, block, portid,
32a4f5ec
JP		 2723 seq, flags, event) <= 0) {
2724 kfree_skb(skb);
2725 return -EINVAL;
2726 }
2727
2728 if (unicast)
f79a3bcb 2729 err = rtnl_unicast(skb, net, portid);
5b5f99b1
ZW		 2730 else
2731 err = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
2732 flags & NLM_F_ECHO);
32a4f5ec 2733
5b5f99b1 2734 return err;
32a4f5ec
JP		 2735}
2736
a5654820
VB		 2737static int tc_chain_notify_delete(const struct tcf_proto_ops *tmplt_ops,
2738 void *tmplt_priv, u32 chain_index,
2739 struct tcf_block *block, struct sk_buff *oskb,
2740 u32 seq, u16 flags, bool unicast)
2741{
2742 u32 portid = oskb ? NETLINK_CB(oskb).portid : 0;
2743 struct net *net = block->net;
2744 struct sk_buff *skb;
2745
2746 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2747 if (!skb)
2748 return -ENOBUFS;
2749
2750 if (tc_chain_fill_node(tmplt_ops, tmplt_priv, chain_index, net, skb,
2751 block, portid, seq, flags, RTM_DELCHAIN) <= 0) {
2752 kfree_skb(skb);
2753 return -EINVAL;
2754 }
2755
2756 if (unicast)
f79a3bcb 2757 return rtnl_unicast(skb, net, portid);
a5654820
VB		 2758
2759 return rtnetlink_send(skb, net, portid, RTNLGRP_TC, flags & NLM_F_ECHO);
2760}
2761
9f407f17
JP		 2762static int tc_chain_tmplt_add(struct tcf_chain *chain, struct net *net,
2763 struct nlattr **tca,
2764 struct netlink_ext_ack *extack)
2765{
2766 const struct tcf_proto_ops *ops;
2dd5616e 2767 char name[IFNAMSIZ];
9f407f17
JP		 2768 void *tmplt_priv;
2769
2770 /* If kind is not set, user did not specify template. */
2771 if (!tca[TCA_KIND])
2772 return 0;
2773
2dd5616e
ED		 2774 if (tcf_proto_check_kind(tca[TCA_KIND], name)) {
2775 NL_SET_ERR_MSG(extack, "Specified TC chain template name too long");
2776 return -EINVAL;
2777 }
2778
2779 ops = tcf_proto_lookup_ops(name, true, extack);
9f407f17
JP		 2780 if (IS_ERR(ops))
2781 return PTR_ERR(ops);
2782 if (!ops->tmplt_create || !ops->tmplt_destroy || !ops->tmplt_dump) {
2783 NL_SET_ERR_MSG(extack, "Chain templates are not supported with specified classifier");
2784 return -EOPNOTSUPP;
2785 }
2786
2787 tmplt_priv = ops->tmplt_create(net, chain, tca, extack);
2788 if (IS_ERR(tmplt_priv)) {
2789 module_put(ops->owner);
2790 return PTR_ERR(tmplt_priv);
2791 }
2792 chain->tmplt_ops = ops;
2793 chain->tmplt_priv = tmplt_priv;
2794 return 0;
2795}
2796
a5654820
VB		 2797static void tc_chain_tmplt_del(const struct tcf_proto_ops *tmplt_ops,
2798 void *tmplt_priv)
9f407f17 2799{
9f407f17 2800 /* If template ops are set, no work to do for us. */
a5654820 2801 if (!tmplt_ops)
9f407f17
JP		 2802 return;
2803
a5654820
VB		 2804 tmplt_ops->tmplt_destroy(tmplt_priv);
2805 module_put(tmplt_ops->owner);
9f407f17
JP		 2806}
2807
32a4f5ec
JP		 2808/* Add/delete/get a chain */
2809
2810static int tc_ctl_chain(struct sk_buff *skb, struct nlmsghdr *n,
2811 struct netlink_ext_ack *extack)
2812{
2813 struct net *net = sock_net(skb->sk);
2814 struct nlattr *tca[TCA_MAX + 1];
2815 struct tcmsg *t;
2816 u32 parent;
2817 u32 chain_index;
04c2a47f
ED		 2818 struct Qdisc *q;
2819 struct tcf_chain *chain;
32a4f5ec
JP		 2820 struct tcf_block *block;
2821 unsigned long cl;
2822 int err;
2823
32a4f5ec 2824replay:
04c2a47f 2825 q = NULL;
8cb08174
JB		 2826 err = nlmsg_parse_deprecated(n, sizeof(*t), tca, TCA_MAX,
2827 rtm_tca_policy, extack);
32a4f5ec
JP		 2828 if (err < 0)
2829 return err;
2830
2831 t = nlmsg_data(n);
2832 parent = t->tcm_parent;
2833 cl = 0;
2834
2835 block = tcf_block_find(net, &q, &parent, &cl,
2836 t->tcm_ifindex, t->tcm_block_index, extack);
2837 if (IS_ERR(block))
2838 return PTR_ERR(block);
2839
2840 chain_index = tca[TCA_CHAIN] ? nla_get_u32(tca[TCA_CHAIN]) : 0;
2841 if (chain_index > TC_ACT_EXT_VAL_MASK) {
2842 NL_SET_ERR_MSG(extack, "Specified chain index exceeds upper limit");
e368fdb6
VB		 2843 err = -EINVAL;
2844 goto errout_block;
32a4f5ec 2845 }
2cbfab07
VB		 2846
2847 mutex_lock(&block->lock);
32a4f5ec
JP		 2848 chain = tcf_chain_lookup(block, chain_index);
2849 if (n->nlmsg_type == RTM_NEWCHAIN) {
2850 if (chain) {
3d32f4c5 2851 if (tcf_chain_held_by_acts_only(chain)) {
1f3ed383 2852 /* The chain exists only because there is
3d32f4c5 2853 * some action referencing it.
1f3ed383
JP		 2854 */
2855 tcf_chain_hold(chain);
2856 } else {
2857 NL_SET_ERR_MSG(extack, "Filter chain already exists");
e368fdb6 2858 err = -EEXIST;
2cbfab07 2859 goto errout_block_locked;
1f3ed383
JP		 2860 }
2861 } else {
2862 if (!(n->nlmsg_flags & NLM_F_CREATE)) {
2863 NL_SET_ERR_MSG(extack, "Need both RTM_NEWCHAIN and NLM_F_CREATE to create a new chain");
e368fdb6 2864 err = -ENOENT;
2cbfab07 2865 goto errout_block_locked;
1f3ed383
JP		 2866 }
2867 chain = tcf_chain_create(block, chain_index);
2868 if (!chain) {
2869 NL_SET_ERR_MSG(extack, "Failed to create filter chain");
e368fdb6 2870 err = -ENOMEM;
2cbfab07 2871 goto errout_block_locked;
1f3ed383 2872 }
32a4f5ec
JP		 2873 }
2874 } else {
3d32f4c5 2875 if (!chain || tcf_chain_held_by_acts_only(chain)) {
32a4f5ec 2876 NL_SET_ERR_MSG(extack, "Cannot find specified filter chain");
e368fdb6 2877 err = -EINVAL;
2cbfab07 2878 goto errout_block_locked;
32a4f5ec
JP		 2879 }
2880 tcf_chain_hold(chain);
2881 }
2882
2cbfab07
VB		 2883 if (n->nlmsg_type == RTM_NEWCHAIN) {
2884 /* Modifying chain requires holding parent block lock. In case
2885 * the chain was successfully added, take a reference to the
2886 * chain. This ensures that an empty chain does not disappear at
2887 * the end of this function.
2888 */
2889 tcf_chain_hold(chain);
2890 chain->explicitly_created = true;
2891 }
2892 mutex_unlock(&block->lock);
2893
32a4f5ec
JP		 2894 switch (n->nlmsg_type) {
2895 case RTM_NEWCHAIN:
9f407f17 2896 err = tc_chain_tmplt_add(chain, net, tca, extack);
2cbfab07
VB		 2897 if (err) {
2898 tcf_chain_put_explicitly_created(chain);
9f407f17 2899 goto errout;
2cbfab07
VB		 2900 }
2901
32a4f5ec
JP		 2902 tc_chain_notify(chain, NULL, 0, NLM_F_CREATE | NLM_F_EXCL,
2903 RTM_NEWCHAIN, false);
2904 break;
2905 case RTM_DELCHAIN:
f5b9bac7 2906 tfilter_notify_chain(net, skb, block, q, parent, n,
0fca55ed 2907 chain, RTM_DELTFILTER);
32a4f5ec 2908 /* Flush the chain first as the user requested chain removal. */
12db03b6 2909 tcf_chain_flush(chain, true);
32a4f5ec
JP		 2910 /* In case the chain was successfully deleted, put a reference
2911 * to the chain previously taken during addition.
2912 */
2913 tcf_chain_put_explicitly_created(chain);
2914 break;
2915 case RTM_GETCHAIN:
32a4f5ec 2916 err = tc_chain_notify(chain, skb, n->nlmsg_seq,
9d85a6f4 2917 n->nlmsg_flags, n->nlmsg_type, true);
32a4f5ec
JP		 2918 if (err < 0)
2919 NL_SET_ERR_MSG(extack, "Failed to send chain notify message");
2920 break;
2921 default:
2922 err = -EOPNOTSUPP;
2923 NL_SET_ERR_MSG(extack, "Unsupported message type");
2924 goto errout;
2925 }
2926
2927errout:
2928 tcf_chain_put(chain);
e368fdb6 2929errout_block:
12db03b6 2930 tcf_block_release(q, block, true);
32a4f5ec
JP		 2931 if (err == -EAGAIN)
2932 /* Replay the request. */
2933 goto replay;
2934 return err;
2cbfab07
VB		 2935
2936errout_block_locked:
2937 mutex_unlock(&block->lock);
2938 goto errout_block;
32a4f5ec
JP		 2939}
2940
2941/* called with RTNL */
2942static int tc_dump_chain(struct sk_buff *skb, struct netlink_callback *cb)
2943{
2944 struct net *net = sock_net(skb->sk);
2945 struct nlattr *tca[TCA_MAX + 1];
2946 struct Qdisc *q = NULL;
2947 struct tcf_block *block;
32a4f5ec 2948 struct tcmsg *tcm = nlmsg_data(cb->nlh);
ace4a267 2949 struct tcf_chain *chain;
32a4f5ec
JP		 2950 long index_start;
2951 long index;
32a4f5ec
JP		 2952 int err;
2953
2954 if (nlmsg_len(cb->nlh) < sizeof(*tcm))
2955 return skb->len;
2956
8cb08174
JB		 2957 err = nlmsg_parse_deprecated(cb->nlh, sizeof(*tcm), tca, TCA_MAX,
2958 rtm_tca_policy, cb->extack);
32a4f5ec
JP		 2959 if (err)
2960 return err;
2961
2962 if (tcm->tcm_ifindex == TCM_IFINDEX_MAGIC_BLOCK) {
787ce6d0 2963 block = tcf_block_refcnt_get(net, tcm->tcm_block_index);
32a4f5ec
JP		 2964 if (!block)
2965 goto out;
32a4f5ec
JP		 2966 } else {
2967 const struct Qdisc_class_ops *cops;
2968 struct net_device *dev;
2969 unsigned long cl = 0;
2970
2971 dev = __dev_get_by_index(net, tcm->tcm_ifindex);
2972 if (!dev)
2973 return skb->len;
2974
0ad41b24 2975 if (!tcm->tcm_parent)
5891cd5e 2976 q = rtnl_dereference(dev->qdisc);
0ad41b24 2977 else
32a4f5ec 2978 q = qdisc_lookup(dev, TC_H_MAJ(tcm->tcm_parent));
0ad41b24 2979
32a4f5ec
JP		 2980 if (!q)
2981 goto out;
2982 cops = q->ops->cl_ops;
2983 if (!cops)
2984 goto out;
2985 if (!cops->tcf_block)
2986 goto out;
2987 if (TC_H_MIN(tcm->tcm_parent)) {
2988 cl = cops->find(q, tcm->tcm_parent);
2989 if (cl == 0)
2990 goto out;
2991 }
2992 block = cops->tcf_block(q, cl, NULL);
2993 if (!block)
2994 goto out;
2995 if (tcf_block_shared(block))
2996 q = NULL;
2997 }
2998
2999 index_start = cb->args[0];
3000 index = 0;
3001
ace4a267
VB		 3002 mutex_lock(&block->lock);
3003 list_for_each_entry(chain, &block->chain_list, list) {
32a4f5ec
JP		 3004 if ((tca[TCA_CHAIN] &&
3005 nla_get_u32(tca[TCA_CHAIN]) != chain->index))
3006 continue;
3007 if (index < index_start) {
3008 index++;
3009 continue;
3010 }
ace4a267
VB		 3011 if (tcf_chain_held_by_acts_only(chain))
3012 continue;
a5654820
VB		 3013 err = tc_chain_fill_node(chain->tmplt_ops, chain->tmplt_priv,
3014 chain->index, net, skb, block,
32a4f5ec
JP		 3015 NETLINK_CB(cb->skb).portid,
3016 cb->nlh->nlmsg_seq, NLM_F_MULTI,
3017 RTM_NEWCHAIN);
ace4a267 3018 if (err <= 0)
32a4f5ec
JP		 3019 break;
3020 index++;
3021 }
ace4a267 3022 mutex_unlock(&block->lock);
32a4f5ec 3023
787ce6d0 3024 if (tcm->tcm_ifindex == TCM_IFINDEX_MAGIC_BLOCK)
12db03b6 3025 tcf_block_refcnt_put(block, true);
32a4f5ec
JP		 3026 cb->args[0] = index;
3027
3028out:
3029 /* If we did no progress, the error (EMSGSIZE) is real */
3030 if (skb->len == 0 && err)
3031 return err;
3032 return skb->len;
3033}
3034
18d0264f 3035void tcf_exts_destroy(struct tcf_exts *exts)
1da177e4
LT		 3036{
3037#ifdef CONFIG_NET_CLS_ACT
3d66b89c
ED		 3038 if (exts->actions) {
3039 tcf_action_destroy(exts->actions, TCA_ACT_UNBIND);
3040 kfree(exts->actions);
3041 }
22dc13c8 3042 exts->nr_actions = 0;
1da177e4
LT		 3043#endif
3044}
aa767bfe 3045EXPORT_SYMBOL(tcf_exts_destroy);
1da177e4 3046
c86e0209
BZ		 3047int tcf_exts_validate_ex(struct net *net, struct tcf_proto *tp, struct nlattr **tb,
3048 struct nlattr *rate_tlv, struct tcf_exts *exts,
3049 u32 flags, u32 fl_flags, struct netlink_ext_ack *extack)
1da177e4 3050{
1da177e4
LT		 3051#ifdef CONFIG_NET_CLS_ACT
3052 {
87c750e8 3053 int init_res[TCA_ACT_MAX_PRIO] = {};
1da177e4 3054 struct tc_action *act;
d04e6990 3055 size_t attr_size = 0;
1da177e4 3056
5da57f42 3057 if (exts->police && tb[exts->police]) {
d349f997
CW		 3058 struct tc_action_ops *a_o;
3059
695176bf
CW		 3060 a_o = tc_action_load_ops(tb[exts->police], true,
3061 !(flags & TCA_ACT_FLAGS_NO_RTNL),
3062 extack);
d349f997
CW		 3063 if (IS_ERR(a_o))
3064 return PTR_ERR(a_o);
695176bf 3065 flags |= TCA_ACT_FLAGS_POLICE | TCA_ACT_FLAGS_BIND;
9fb9f251 3066 act = tcf_action_init_1(net, tp, tb[exts->police],
695176bf
CW		 3067 rate_tlv, a_o, init_res, flags,
3068 extack);
b3650bf7
VB		 3069 module_put(a_o->owner);
3070 if (IS_ERR(act))
ab27cfb8 3071 return PTR_ERR(act);
1da177e4 3072
33be6271 3073 act->type = exts->type = TCA_OLD_COMPAT;
22dc13c8
WC		 3074 exts->actions[0] = act;
3075 exts->nr_actions = 1;
396d7f23 3076 tcf_idr_insert_many(exts->actions);
5da57f42 3077 } else if (exts->action && tb[exts->action]) {
90b73b77 3078 int err;
22dc13c8 3079
695176bf 3080 flags |= TCA_ACT_FLAGS_BIND;
9fb9f251 3081 err = tcf_action_init(net, tp, tb[exts->action],
695176bf 3082 rate_tlv, exts->actions, init_res,
c86e0209
BZ		 3083 &attr_size, flags, fl_flags,
3084 extack);
90b73b77 3085 if (err < 0)
33be6271 3086 return err;
90b73b77 3087 exts->nr_actions = err;
1da177e4
LT		 3088 }
3089 }
1da177e4 3090#else
5da57f42 3091 if ((exts->action && tb[exts->action]) ||
50a56190
AA		 3092 (exts->police && tb[exts->police])) {
3093 NL_SET_ERR_MSG(extack, "Classifier actions are not supported per compile options (CONFIG_NET_CLS_ACT)");
1da177e4 3094 return -EOPNOTSUPP;
50a56190 3095 }
1da177e4
LT		 3096#endif
3097
3098 return 0;
3099}
c86e0209
BZ		 3100EXPORT_SYMBOL(tcf_exts_validate_ex);
3101
3102int tcf_exts_validate(struct net *net, struct tcf_proto *tp, struct nlattr **tb,
3103 struct nlattr *rate_tlv, struct tcf_exts *exts,
3104 u32 flags, struct netlink_ext_ack *extack)
3105{
3106 return tcf_exts_validate_ex(net, tp, tb, rate_tlv, exts,
3107 flags, 0, extack);
3108}
aa767bfe 3109EXPORT_SYMBOL(tcf_exts_validate);
1da177e4 3110
9b0d4446 3111void tcf_exts_change(struct tcf_exts *dst, struct tcf_exts *src)
1da177e4
LT		 3112{
3113#ifdef CONFIG_NET_CLS_ACT
22dc13c8
WC		 3114 struct tcf_exts old = *dst;
3115
9b0d4446 3116 *dst = *src;
22dc13c8 3117 tcf_exts_destroy(&old);
1da177e4
LT		 3118#endif
3119}
aa767bfe 3120EXPORT_SYMBOL(tcf_exts_change);
1da177e4 3121
22dc13c8
WC		 3122#ifdef CONFIG_NET_CLS_ACT
3123static struct tc_action *tcf_exts_first_act(struct tcf_exts *exts)
3124{
3125 if (exts->nr_actions == 0)
3126 return NULL;
3127 else
3128 return exts->actions[0];
3129}
3130#endif
33be6271 3131
5da57f42 3132int tcf_exts_dump(struct sk_buff *skb, struct tcf_exts *exts)
1da177e4
LT		 3133{
3134#ifdef CONFIG_NET_CLS_ACT
9cc63db5
CW		 3135 struct nlattr *nest;
3136
978dfd8d 3137 if (exts->action && tcf_exts_has_actions(exts)) {
1da177e4
LT		 3138 /*
3139 * again for backward compatible mode - we want
3140 * to work with both old and new modes of entering
3141 * tc data even if iproute2 was newer - jhs
3142 */
33be6271 3143 if (exts->type != TCA_OLD_COMPAT) {
ae0be8de 3144 nest = nla_nest_start_noflag(skb, exts->action);
4b3550ef
PM		 3145 if (nest == NULL)
3146 goto nla_put_failure;
22dc13c8 3147
ca44b738
VB		 3148 if (tcf_action_dump(skb, exts->actions, 0, 0, false)
3149 < 0)
add93b61 3150 goto nla_put_failure;
4b3550ef 3151 nla_nest_end(skb, nest);
5da57f42 3152 } else if (exts->police) {
33be6271 3153 struct tc_action *act = tcf_exts_first_act(exts);
ae0be8de 3154 nest = nla_nest_start_noflag(skb, exts->police);
63acd680 3155 if (nest == NULL || !act)
4b3550ef 3156 goto nla_put_failure;
33be6271 3157 if (tcf_action_dump_old(skb, act, 0, 0) < 0)
add93b61 3158 goto nla_put_failure;
4b3550ef 3159 nla_nest_end(skb, nest);
1da177e4
LT		 3160 }
3161 }
1da177e4 3162 return 0;
9cc63db5
CW		 3163
3164nla_put_failure:
3165 nla_nest_cancel(skb, nest);
1da177e4 3166 return -1;
9cc63db5
CW		 3167#else
3168 return 0;
3169#endif
1da177e4 3170}
aa767bfe 3171EXPORT_SYMBOL(tcf_exts_dump);
1da177e4 3172
ca44b738
VB		 3173int tcf_exts_terse_dump(struct sk_buff *skb, struct tcf_exts *exts)
3174{
3175#ifdef CONFIG_NET_CLS_ACT
3176 struct nlattr *nest;
3177
3178 if (!exts->action || !tcf_exts_has_actions(exts))
3179 return 0;
3180
3181 nest = nla_nest_start_noflag(skb, exts->action);
3182 if (!nest)
3183 goto nla_put_failure;
3184
3185 if (tcf_action_dump(skb, exts->actions, 0, 0, true) < 0)
3186 goto nla_put_failure;
3187 nla_nest_end(skb, nest);
3188 return 0;
3189
3190nla_put_failure:
3191 nla_nest_cancel(skb, nest);
3192 return -1;
3193#else
3194 return 0;
3195#endif
3196}
3197EXPORT_SYMBOL(tcf_exts_terse_dump);
aa767bfe 3198
5da57f42 3199int tcf_exts_dump_stats(struct sk_buff *skb, struct tcf_exts *exts)
1da177e4
LT		 3200{
3201#ifdef CONFIG_NET_CLS_ACT
33be6271 3202 struct tc_action *a = tcf_exts_first_act(exts);
b057df24 3203 if (a != NULL && tcf_action_copy_stats(skb, a, 1) < 0)
33be6271 3204 return -1;
1da177e4
LT		 3205#endif
3206 return 0;
1da177e4 3207}
aa767bfe 3208EXPORT_SYMBOL(tcf_exts_dump_stats);
1da177e4 3209
40119211
VB		 3210static void tcf_block_offload_inc(struct tcf_block *block, u32 *flags)
3211{
3212 if (*flags & TCA_CLS_FLAGS_IN_HW)
3213 return;
3214 *flags |= TCA_CLS_FLAGS_IN_HW;
3215 atomic_inc(&block->offloadcnt);
3216}
3217
3218static void tcf_block_offload_dec(struct tcf_block *block, u32 *flags)
3219{
3220 if (!(*flags & TCA_CLS_FLAGS_IN_HW))
3221 return;
3222 *flags &= ~TCA_CLS_FLAGS_IN_HW;
3223 atomic_dec(&block->offloadcnt);
3224}
3225
3226static void tc_cls_offload_cnt_update(struct tcf_block *block,
3227 struct tcf_proto *tp, u32 *cnt,
3228 u32 *flags, u32 diff, bool add)
3229{
3230 lockdep_assert_held(&block->cb_lock);
3231
3232 spin_lock(&tp->lock);
3233 if (add) {
3234 if (!*cnt)
3235 tcf_block_offload_inc(block, flags);
3236 *cnt += diff;
3237 } else {
3238 *cnt -= diff;
3239 if (!*cnt)
3240 tcf_block_offload_dec(block, flags);
3241 }
3242 spin_unlock(&tp->lock);
3243}
3244
3245static void
3246tc_cls_offload_cnt_reset(struct tcf_block *block, struct tcf_proto *tp,
3247 u32 *cnt, u32 *flags)
3248{
3249 lockdep_assert_held(&block->cb_lock);
3250
3251 spin_lock(&tp->lock);
3252 tcf_block_offload_dec(block, flags);
3253 *cnt = 0;
3254 spin_unlock(&tp->lock);
3255}
3256
3257static int
3258__tc_setup_cb_call(struct tcf_block *block, enum tc_setup_type type,
3259 void *type_data, bool err_stop)
717503b9 3260{
955bcb6e 3261 struct flow_block_cb *block_cb;
aeb3fecd
CW		 3262 int ok_count = 0;
3263 int err;
3264
14bfb13f 3265 list_for_each_entry(block_cb, &block->flow_block.cb_list, list) {
aeb3fecd
CW		 3266 err = block_cb->cb(type, type_data, block_cb->cb_priv);
3267 if (err) {
40119211
VB		 3268 if (err_stop)
3269 return err;
aeb3fecd
CW		 3270 } else {
3271 ok_count++;
3272 }
3273 }
40119211
VB		 3274 return ok_count;
3275}
3276
3277int tc_setup_cb_call(struct tcf_block *block, enum tc_setup_type type,
3278 void *type_data, bool err_stop, bool rtnl_held)
3279{
11bd634d 3280 bool take_rtnl = READ_ONCE(block->lockeddevcnt) && !rtnl_held;
40119211
VB		 3281 int ok_count;
3282
11bd634d
VB		 3283retry:
3284 if (take_rtnl)
3285 rtnl_lock();
40119211 3286 down_read(&block->cb_lock);
11bd634d
VB		 3287 /* Need to obtain rtnl lock if block is bound to devs that require it.
3288 * In block bind code cb_lock is obtained while holding rtnl, so we must
3289 * obtain the locks in same order here.
3290 */
3291 if (!rtnl_held && !take_rtnl && block->lockeddevcnt) {
3292 up_read(&block->cb_lock);
3293 take_rtnl = true;
3294 goto retry;
3295 }
3296
40119211 3297 ok_count = __tc_setup_cb_call(block, type, type_data, err_stop);
11bd634d 3298
4f8116c8 3299 up_read(&block->cb_lock);
11bd634d
VB		 3300 if (take_rtnl)
3301 rtnl_unlock();
aeb3fecd 3302 return ok_count;
717503b9
JP		 3303}
3304EXPORT_SYMBOL(tc_setup_cb_call);
b3f55bdd 3305
40119211
VB		 3306/* Non-destructive filter add. If filter that wasn't already in hardware is
3307 * successfully offloaded, increment block offloads counter. On failure,
3308 * previously offloaded filter is considered to be intact and offloads counter
3309 * is not decremented.
3310 */
3311
3312int tc_setup_cb_add(struct tcf_block *block, struct tcf_proto *tp,
3313 enum tc_setup_type type, void *type_data, bool err_stop,
3314 u32 *flags, unsigned int *in_hw_count, bool rtnl_held)
3315{
11bd634d 3316 bool take_rtnl = READ_ONCE(block->lockeddevcnt) && !rtnl_held;
40119211
VB		 3317 int ok_count;
3318
11bd634d
VB		 3319retry:
3320 if (take_rtnl)
3321 rtnl_lock();
40119211 3322 down_read(&block->cb_lock);
11bd634d
VB		 3323 /* Need to obtain rtnl lock if block is bound to devs that require it.
3324 * In block bind code cb_lock is obtained while holding rtnl, so we must
3325 * obtain the locks in same order here.
3326 */
3327 if (!rtnl_held && !take_rtnl && block->lockeddevcnt) {
3328 up_read(&block->cb_lock);
3329 take_rtnl = true;
3330 goto retry;
3331 }
3332
40119211
VB		 3333 /* Make sure all netdevs sharing this block are offload-capable. */
3334 if (block->nooffloaddevcnt && err_stop) {
3335 ok_count = -EOPNOTSUPP;
3336 goto err_unlock;
3337 }
3338
3339 ok_count = __tc_setup_cb_call(block, type, type_data, err_stop);
a449a3e7
VB		 3340 if (ok_count < 0)
3341 goto err_unlock;
3342
3343 if (tp->ops->hw_add)
3344 tp->ops->hw_add(tp, type_data);
40119211
VB		 3345 if (ok_count > 0)
3346 tc_cls_offload_cnt_update(block, tp, in_hw_count, flags,
3347 ok_count, true);
3348err_unlock:
3349 up_read(&block->cb_lock);
11bd634d
VB		 3350 if (take_rtnl)
3351 rtnl_unlock();
c48c94b0 3352 return min(ok_count, 0);
40119211
VB		 3353}
3354EXPORT_SYMBOL(tc_setup_cb_add);
3355
3356/* Destructive filter replace. If filter that wasn't already in hardware is
3357 * successfully offloaded, increment block offload counter. On failure,
3358 * previously offloaded filter is considered to be destroyed and offload counter
3359 * is decremented.
3360 */
3361
3362int tc_setup_cb_replace(struct tcf_block *block, struct tcf_proto *tp,
3363 enum tc_setup_type type, void *type_data, bool err_stop,
3364 u32 *old_flags, unsigned int *old_in_hw_count,
3365 u32 *new_flags, unsigned int *new_in_hw_count,
3366 bool rtnl_held)
3367{
11bd634d 3368 bool take_rtnl = READ_ONCE(block->lockeddevcnt) && !rtnl_held;
40119211
VB		 3369 int ok_count;
3370
11bd634d
VB		 3371retry:
3372 if (take_rtnl)
3373 rtnl_lock();
40119211 3374 down_read(&block->cb_lock);
11bd634d
VB		 3375 /* Need to obtain rtnl lock if block is bound to devs that require it.
3376 * In block bind code cb_lock is obtained while holding rtnl, so we must
3377 * obtain the locks in same order here.
3378 */
3379 if (!rtnl_held && !take_rtnl && block->lockeddevcnt) {
3380 up_read(&block->cb_lock);
3381 take_rtnl = true;
3382 goto retry;
3383 }
3384
40119211
VB		 3385 /* Make sure all netdevs sharing this block are offload-capable. */
3386 if (block->nooffloaddevcnt && err_stop) {
3387 ok_count = -EOPNOTSUPP;
3388 goto err_unlock;
3389 }
3390
3391 tc_cls_offload_cnt_reset(block, tp, old_in_hw_count, old_flags);
a449a3e7
VB		 3392 if (tp->ops->hw_del)
3393 tp->ops->hw_del(tp, type_data);
40119211
VB		 3394
3395 ok_count = __tc_setup_cb_call(block, type, type_data, err_stop);
a449a3e7
VB		 3396 if (ok_count < 0)
3397 goto err_unlock;
3398
3399 if (tp->ops->hw_add)
3400 tp->ops->hw_add(tp, type_data);
40119211 3401 if (ok_count > 0)
a449a3e7
VB		 3402 tc_cls_offload_cnt_update(block, tp, new_in_hw_count,
3403 new_flags, ok_count, true);
40119211
VB		 3404err_unlock:
3405 up_read(&block->cb_lock);
11bd634d
VB		 3406 if (take_rtnl)
3407 rtnl_unlock();
c48c94b0 3408 return min(ok_count, 0);
40119211
VB		 3409}
3410EXPORT_SYMBOL(tc_setup_cb_replace);
3411
3412/* Destroy filter and decrement block offload counter, if filter was previously
3413 * offloaded.
3414 */
3415
3416int tc_setup_cb_destroy(struct tcf_block *block, struct tcf_proto *tp,
3417 enum tc_setup_type type, void *type_data, bool err_stop,
3418 u32 *flags, unsigned int *in_hw_count, bool rtnl_held)
3419{
11bd634d 3420 bool take_rtnl = READ_ONCE(block->lockeddevcnt) && !rtnl_held;
40119211
VB		 3421 int ok_count;
3422
11bd634d
VB		 3423retry:
3424 if (take_rtnl)
3425 rtnl_lock();
40119211 3426 down_read(&block->cb_lock);
11bd634d
VB		 3427 /* Need to obtain rtnl lock if block is bound to devs that require it.
3428 * In block bind code cb_lock is obtained while holding rtnl, so we must
3429 * obtain the locks in same order here.
3430 */
3431 if (!rtnl_held && !take_rtnl && block->lockeddevcnt) {
3432 up_read(&block->cb_lock);
3433 take_rtnl = true;
3434 goto retry;
3435 }
3436
40119211
VB		 3437 ok_count = __tc_setup_cb_call(block, type, type_data, err_stop);
3438
3439 tc_cls_offload_cnt_reset(block, tp, in_hw_count, flags);
a449a3e7
VB		 3440 if (tp->ops->hw_del)
3441 tp->ops->hw_del(tp, type_data);
3442
40119211 3443 up_read(&block->cb_lock);
11bd634d
VB		 3444 if (take_rtnl)
3445 rtnl_unlock();
c48c94b0 3446 return min(ok_count, 0);
40119211
VB		 3447}
3448EXPORT_SYMBOL(tc_setup_cb_destroy);
3449
3450int tc_setup_cb_reoffload(struct tcf_block *block, struct tcf_proto *tp,
3451 bool add, flow_setup_cb_t *cb,
3452 enum tc_setup_type type, void *type_data,
3453 void *cb_priv, u32 *flags, unsigned int *in_hw_count)
3454{
3455 int err = cb(type, type_data, cb_priv);
3456
3457 if (err) {
3458 if (add && tc_skip_sw(*flags))
3459 return err;
3460 } else {
3461 tc_cls_offload_cnt_update(block, tp, in_hw_count, flags, 1,
3462 add);
3463 }
3464
3465 return 0;
3466}
3467EXPORT_SYMBOL(tc_setup_cb_reoffload);
3468
2008495d
JP		 3469static int tcf_act_get_cookie(struct flow_action_entry *entry,
3470 const struct tc_action *act)
3471{
3472 struct tc_cookie *cookie;
3473 int err = 0;
3474
3475 rcu_read_lock();
3476 cookie = rcu_dereference(act->act_cookie);
3477 if (cookie) {
3478 entry->cookie = flow_action_cookie_create(cookie->data,
3479 cookie->len,
3480 GFP_ATOMIC);
3481 if (!entry->cookie)
3482 err = -ENOMEM;
3483 }
3484 rcu_read_unlock();
3485 return err;
3486}
3487
3488static void tcf_act_put_cookie(struct flow_action_entry *entry)
3489{
3490 flow_action_cookie_destroy(entry->cookie);
3491}
3492
9c1c0e12 3493void tc_cleanup_offload_action(struct flow_action *flow_action)
5a6ff4b1
VB		 3494{
3495 struct flow_action_entry *entry;
3496 int i;
3497
2008495d
JP		 3498 flow_action_for_each(i, entry, flow_action) {
3499 tcf_act_put_cookie(entry);
1158958a
VB		 3500 if (entry->destructor)
3501 entry->destructor(entry->destructor_priv);
2008495d 3502 }
5a6ff4b1 3503}
9c1c0e12 3504EXPORT_SYMBOL(tc_cleanup_offload_action);
5a6ff4b1 3505
c54e1d92
BZ		 3506static int tc_setup_offload_act(struct tc_action *act,
3507 struct flow_action_entry *entry,
c2ccf84e
IS		 3508 u32 *index_inc,
3509 struct netlink_ext_ack *extack)
1158958a 3510{
470d5060 3511#ifdef CONFIG_NET_CLS_ACT
c440615f 3512 if (act->ops->offload_act_setup) {
c2ccf84e
IS		 3513 return act->ops->offload_act_setup(act, entry, index_inc, true,
3514 extack);
c440615f
IS		 3515 } else {
3516 NL_SET_ERR_MSG(extack, "Action does not support offload");
c54e1d92 3517 return -EOPNOTSUPP;
c440615f 3518 }
c54e1d92 3519#else
1158958a 3520 return 0;
4a5da47d
VB		 3521#endif
3522}
3523
8cbfe939 3524int tc_setup_action(struct flow_action *flow_action,
c2ccf84e
IS		 3525 struct tc_action *actions[],
3526 struct netlink_ext_ack *extack)
3a7b6861 3527{
c0f47c28 3528 int i, j, k, index, err = 0;
7a472814 3529 struct tc_action *act;
3a7b6861 3530
0dfb2d82
JK		 3531 BUILD_BUG_ON(TCA_ACT_HW_STATS_ANY != FLOW_ACTION_HW_STATS_ANY);
3532 BUILD_BUG_ON(TCA_ACT_HW_STATS_IMMEDIATE != FLOW_ACTION_HW_STATS_IMMEDIATE);
3533 BUILD_BUG_ON(TCA_ACT_HW_STATS_DELAYED != FLOW_ACTION_HW_STATS_DELAYED);
44f86580 3534
8cbfe939 3535 if (!actions)
3a7b6861
PNA		 3536 return 0;
3537
3538 j = 0;
8cbfe939 3539 tcf_act_for_each_action(i, act, actions) {
3a7b6861
PNA		 3540 struct flow_action_entry *entry;
3541
3542 entry = &flow_action->entries[j];
7a472814 3543 spin_lock_bh(&act->tcfa_lock);
2008495d
JP		 3544 err = tcf_act_get_cookie(entry, act);
3545 if (err)
3546 goto err_out_locked;
44f86580 3547
c54e1d92 3548 index = 0;
c2ccf84e 3549 err = tc_setup_offload_act(act, entry, &index, extack);
c0f47c28 3550 if (err)
7a472814 3551 goto err_out_locked;
c0f47c28
OS		 3552
3553 for (k = 0; k < index ; k++) {
3554 entry[k].hw_stats = tc_act_hw_stats(act->hw_stats);
3555 entry[k].hw_index = act->tcfa_index;
3556 }
3557
3558 j += index;
3559
7a472814 3560 spin_unlock_bh(&act->tcfa_lock);
3a7b6861 3561 }
9838b20a 3562
3a7b6861 3563err_out:
5a6ff4b1 3564 if (err)
9c1c0e12 3565 tc_cleanup_offload_action(flow_action);
5a6ff4b1 3566
9838b20a 3567 return err;
7a472814
VB		 3568err_out_locked:
3569 spin_unlock_bh(&act->tcfa_lock);
3570 goto err_out;
3a7b6861 3571}
8cbfe939
BZ		 3572
3573int tc_setup_offload_action(struct flow_action *flow_action,
c2ccf84e
IS		 3574 const struct tcf_exts *exts,
3575 struct netlink_ext_ack *extack)
8cbfe939
BZ		 3576{
3577#ifdef CONFIG_NET_CLS_ACT
3578 if (!exts)
3579 return 0;
3580
c2ccf84e 3581 return tc_setup_action(flow_action, exts->actions, extack);
8cbfe939
BZ		 3582#else
3583 return 0;
3584#endif
3585}
9c1c0e12 3586EXPORT_SYMBOL(tc_setup_offload_action);
3a7b6861 3587
e3ab786b
PNA		 3588unsigned int tcf_exts_num_actions(struct tcf_exts *exts)
3589{
3590 unsigned int num_acts = 0;
3591 struct tc_action *act;
3592 int i;
3593
3594 tcf_exts_for_each_action(i, act, exts) {
3595 if (is_tcf_pedit(act))
3596 num_acts += tcf_pedit_nkeys(act);
3597 else
3598 num_acts++;
3599 }
3600 return num_acts;
3601}
3602EXPORT_SYMBOL(tcf_exts_num_actions);
3603
3625750f
PM		 3604#ifdef CONFIG_NET_CLS_ACT
3605static int tcf_qevent_parse_block_index(struct nlattr *block_index_attr,
3606 u32 *p_block_index,
3607 struct netlink_ext_ack *extack)
3608{
3609 *p_block_index = nla_get_u32(block_index_attr);
3610 if (!*p_block_index) {
3611 NL_SET_ERR_MSG(extack, "Block number may not be zero");
3612 return -EINVAL;
3613 }
3614
3615 return 0;
3616}
3617
3618int tcf_qevent_init(struct tcf_qevent *qe, struct Qdisc *sch,
3619 enum flow_block_binder_type binder_type,
3620 struct nlattr *block_index_attr,
3621 struct netlink_ext_ack *extack)
3622{
3623 u32 block_index;
3624 int err;
3625
3626 if (!block_index_attr)
3627 return 0;
3628
3629 err = tcf_qevent_parse_block_index(block_index_attr, &block_index, extack);
3630 if (err)
3631 return err;
3632
3625750f
PM		 3633 qe->info.binder_type = binder_type;
3634 qe->info.chain_head_change = tcf_chain_head_change_dflt;
3635 qe->info.chain_head_change_priv = &qe->filter_chain;
3636 qe->info.block_index = block_index;
3637
3638 return tcf_block_get_ext(&qe->block, sch, &qe->info, extack);
3639}
3640EXPORT_SYMBOL(tcf_qevent_init);
3641
3642void tcf_qevent_destroy(struct tcf_qevent *qe, struct Qdisc *sch)
3643{
3644 if (qe->info.block_index)
3645 tcf_block_put_ext(qe->block, sch, &qe->info);
3646}
3647EXPORT_SYMBOL(tcf_qevent_destroy);
3648
3649int tcf_qevent_validate_change(struct tcf_qevent *qe, struct nlattr *block_index_attr,
3650 struct netlink_ext_ack *extack)
3651{
3652 u32 block_index;
3653 int err;
3654
3655 if (!block_index_attr)
3656 return 0;
3657
3658 err = tcf_qevent_parse_block_index(block_index_attr, &block_index, extack);
3659 if (err)
3660 return err;
3661
3662 /* Bounce newly-configured block or change in block. */
3663 if (block_index != qe->info.block_index) {
3664 NL_SET_ERR_MSG(extack, "Change of blocks is not supported");
3665 return -EINVAL;
3666 }
3667
3668 return 0;
3669}
3670EXPORT_SYMBOL(tcf_qevent_validate_change);
3671
3672struct sk_buff *tcf_qevent_handle(struct tcf_qevent *qe, struct Qdisc *sch, struct sk_buff *skb,
55f656cd 3673 struct sk_buff **to_free, int *ret)
3625750f
PM		 3674{
3675 struct tcf_result cl_res;
3676 struct tcf_proto *fl;
3677
3678 if (!qe->info.block_index)
3679 return skb;
3680
3681 fl = rcu_dereference_bh(qe->filter_chain);
3682
3aa26055 3683 switch (tcf_classify(skb, NULL, fl, &cl_res, false)) {
3625750f
PM		 3684 case TC_ACT_SHOT:
3685 qdisc_qstats_drop(sch);
3686 __qdisc_drop(skb, to_free);
3687 *ret = __NET_XMIT_BYPASS;
3688 return NULL;
3689 case TC_ACT_STOLEN:
3690 case TC_ACT_QUEUED:
3691 case TC_ACT_TRAP:
3692 __qdisc_drop(skb, to_free);
3693 *ret = __NET_XMIT_STOLEN;
3694 return NULL;
3695 case TC_ACT_REDIRECT:
3696 skb_do_redirect(skb);
3697 *ret = __NET_XMIT_STOLEN;
3698 return NULL;
3699 }
3700
3625750f
PM		 3701 return skb;
3702}
3703EXPORT_SYMBOL(tcf_qevent_handle);
3704
3705int tcf_qevent_dump(struct sk_buff *skb, int attr_name, struct tcf_qevent *qe)
3706{
3707 if (!qe->info.block_index)
3708 return 0;
3709 return nla_put_u32(skb, attr_name, qe->info.block_index);
3710}
3711EXPORT_SYMBOL(tcf_qevent_dump);
3712#endif
3713
48617387
JP		 3714static __net_init int tcf_net_init(struct net *net)
3715{
3716 struct tcf_net *tn = net_generic(net, tcf_net_id);
3717
ab281629 3718 spin_lock_init(&tn->idr_lock);
48617387
JP		 3719 idr_init(&tn->idr);
3720 return 0;
3721}
3722
3723static void __net_exit tcf_net_exit(struct net *net)
3724{
3725 struct tcf_net *tn = net_generic(net, tcf_net_id);
3726
3727 idr_destroy(&tn->idr);
3728}
3729
3730static struct pernet_operations tcf_net_ops = {
3731 .init = tcf_net_init,
3732 .exit = tcf_net_exit,
3733 .id = &tcf_net_id,
3734 .size = sizeof(struct tcf_net),
3735};
3736
1da177e4
LT		 3737static int __init tc_filter_init(void)
3738{
48617387
JP		 3739 int err;
3740
7aa0045d
CW		 3741 tc_filter_wq = alloc_ordered_workqueue("tc_filter_workqueue", 0);
3742 if (!tc_filter_wq)
3743 return -ENOMEM;
3744
48617387
JP		 3745 err = register_pernet_subsys(&tcf_net_ops);
3746 if (err)
3747 goto err_register_pernet_subsys;
3748
470502de
VB		 3749 rtnl_register(PF_UNSPEC, RTM_NEWTFILTER, tc_new_tfilter, NULL,
3750 RTNL_FLAG_DOIT_UNLOCKED);
3751 rtnl_register(PF_UNSPEC, RTM_DELTFILTER, tc_del_tfilter, NULL,
3752 RTNL_FLAG_DOIT_UNLOCKED);
c431f89b 3753 rtnl_register(PF_UNSPEC, RTM_GETTFILTER, tc_get_tfilter,
470502de 3754 tc_dump_tfilter, RTNL_FLAG_DOIT_UNLOCKED);
32a4f5ec
JP		 3755 rtnl_register(PF_UNSPEC, RTM_NEWCHAIN, tc_ctl_chain, NULL, 0);
3756 rtnl_register(PF_UNSPEC, RTM_DELCHAIN, tc_ctl_chain, NULL, 0);
3757 rtnl_register(PF_UNSPEC, RTM_GETCHAIN, tc_ctl_chain,
3758 tc_dump_chain, 0);
1da177e4 3759
1da177e4 3760 return 0;
48617387
JP		 3761
3762err_register_pernet_subsys:
3763 destroy_workqueue(tc_filter_wq);
3764 return err;
1da177e4
LT		 3765}
3766
3767subsys_initcall(tc_filter_init);
Linux 6.x block layer and io_uring tree(s)