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1da177e4 LT |
1 | /* |
2 | * net/sched/cls_api.c Packet classifier API. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public License | |
6 | * as published by the Free Software Foundation; either version | |
7 | * 2 of the License, or (at your option) any later version. | |
8 | * | |
9 | * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> | |
10 | * | |
11 | * Changes: | |
12 | * | |
13 | * Eduardo J. Blanco <ejbs@netlabs.com.uy> :990222: kmod support | |
14 | * | |
15 | */ | |
16 | ||
1da177e4 LT |
17 | #include <linux/module.h> |
18 | #include <linux/types.h> | |
19 | #include <linux/kernel.h> | |
1da177e4 | 20 | #include <linux/string.h> |
1da177e4 | 21 | #include <linux/errno.h> |
33a48927 | 22 | #include <linux/err.h> |
1da177e4 | 23 | #include <linux/skbuff.h> |
1da177e4 LT |
24 | #include <linux/init.h> |
25 | #include <linux/kmod.h> | |
5a0e3ad6 | 26 | #include <linux/slab.h> |
48617387 | 27 | #include <linux/idr.h> |
7f76fa36 | 28 | #include <linux/rhashtable.h> |
b854272b DL |
29 | #include <net/net_namespace.h> |
30 | #include <net/sock.h> | |
dc5fc579 | 31 | #include <net/netlink.h> |
1da177e4 LT |
32 | #include <net/pkt_sched.h> |
33 | #include <net/pkt_cls.h> | |
34 | ||
e331473f DC |
35 | extern const struct nla_policy rtm_tca_policy[TCA_MAX + 1]; |
36 | ||
1da177e4 | 37 | /* The list of all installed classifier types */ |
36272874 | 38 | static LIST_HEAD(tcf_proto_base); |
1da177e4 LT |
39 | |
40 | /* Protects list of registered TC modules. It is pure SMP lock. */ | |
41 | static DEFINE_RWLOCK(cls_mod_lock); | |
42 | ||
43 | /* Find classifier type by string name */ | |
44 | ||
f34e8bff | 45 | static const struct tcf_proto_ops *__tcf_proto_lookup_ops(const char *kind) |
1da177e4 | 46 | { |
dcd76081 | 47 | const struct tcf_proto_ops *t, *res = NULL; |
1da177e4 LT |
48 | |
49 | if (kind) { | |
50 | read_lock(&cls_mod_lock); | |
36272874 | 51 | list_for_each_entry(t, &tcf_proto_base, head) { |
33a48927 | 52 | if (strcmp(kind, t->kind) == 0) { |
dcd76081 ED |
53 | if (try_module_get(t->owner)) |
54 | res = t; | |
1da177e4 LT |
55 | break; |
56 | } | |
57 | } | |
58 | read_unlock(&cls_mod_lock); | |
59 | } | |
dcd76081 | 60 | return res; |
1da177e4 LT |
61 | } |
62 | ||
f34e8bff JP |
63 | static const struct tcf_proto_ops * |
64 | tcf_proto_lookup_ops(const char *kind, struct netlink_ext_ack *extack) | |
65 | { | |
66 | const struct tcf_proto_ops *ops; | |
67 | ||
68 | ops = __tcf_proto_lookup_ops(kind); | |
69 | if (ops) | |
70 | return ops; | |
71 | #ifdef CONFIG_MODULES | |
72 | rtnl_unlock(); | |
73 | request_module("cls_%s", kind); | |
74 | rtnl_lock(); | |
75 | ops = __tcf_proto_lookup_ops(kind); | |
76 | /* We dropped the RTNL semaphore in order to perform | |
77 | * the module load. So, even if we succeeded in loading | |
78 | * the module we have to replay the request. We indicate | |
79 | * this using -EAGAIN. | |
80 | */ | |
81 | if (ops) { | |
82 | module_put(ops->owner); | |
83 | return ERR_PTR(-EAGAIN); | |
84 | } | |
85 | #endif | |
86 | NL_SET_ERR_MSG(extack, "TC classifier not found"); | |
87 | return ERR_PTR(-ENOENT); | |
88 | } | |
89 | ||
1da177e4 LT |
90 | /* Register(unregister) new classifier type */ |
91 | ||
92 | int register_tcf_proto_ops(struct tcf_proto_ops *ops) | |
93 | { | |
36272874 | 94 | struct tcf_proto_ops *t; |
1da177e4 LT |
95 | int rc = -EEXIST; |
96 | ||
97 | write_lock(&cls_mod_lock); | |
36272874 | 98 | list_for_each_entry(t, &tcf_proto_base, head) |
1da177e4 LT |
99 | if (!strcmp(ops->kind, t->kind)) |
100 | goto out; | |
101 | ||
36272874 | 102 | list_add_tail(&ops->head, &tcf_proto_base); |
1da177e4 LT |
103 | rc = 0; |
104 | out: | |
105 | write_unlock(&cls_mod_lock); | |
106 | return rc; | |
107 | } | |
aa767bfe | 108 | EXPORT_SYMBOL(register_tcf_proto_ops); |
1da177e4 | 109 | |
7aa0045d CW |
110 | static struct workqueue_struct *tc_filter_wq; |
111 | ||
1da177e4 LT |
112 | int unregister_tcf_proto_ops(struct tcf_proto_ops *ops) |
113 | { | |
36272874 | 114 | struct tcf_proto_ops *t; |
1da177e4 LT |
115 | int rc = -ENOENT; |
116 | ||
c78e1746 DB |
117 | /* Wait for outstanding call_rcu()s, if any, from a |
118 | * tcf_proto_ops's destroy() handler. | |
119 | */ | |
120 | rcu_barrier(); | |
7aa0045d | 121 | flush_workqueue(tc_filter_wq); |
c78e1746 | 122 | |
1da177e4 | 123 | write_lock(&cls_mod_lock); |
dcd76081 ED |
124 | list_for_each_entry(t, &tcf_proto_base, head) { |
125 | if (t == ops) { | |
126 | list_del(&t->head); | |
127 | rc = 0; | |
1da177e4 | 128 | break; |
dcd76081 ED |
129 | } |
130 | } | |
1da177e4 LT |
131 | write_unlock(&cls_mod_lock); |
132 | return rc; | |
133 | } | |
aa767bfe | 134 | EXPORT_SYMBOL(unregister_tcf_proto_ops); |
1da177e4 | 135 | |
aaa908ff | 136 | bool tcf_queue_work(struct rcu_work *rwork, work_func_t func) |
7aa0045d | 137 | { |
aaa908ff CW |
138 | INIT_RCU_WORK(rwork, func); |
139 | return queue_rcu_work(tc_filter_wq, rwork); | |
7aa0045d CW |
140 | } |
141 | EXPORT_SYMBOL(tcf_queue_work); | |
142 | ||
1da177e4 LT |
143 | /* Select new prio value from the range, managed by kernel. */ |
144 | ||
aa767bfe | 145 | static inline u32 tcf_auto_prio(struct tcf_proto *tp) |
1da177e4 | 146 | { |
aa767bfe | 147 | u32 first = TC_H_MAKE(0xC0000000U, 0U); |
1da177e4 LT |
148 | |
149 | if (tp) | |
cc7ec456 | 150 | first = tp->prio - 1; |
1da177e4 | 151 | |
7961973a | 152 | return TC_H_MAJ(first); |
1da177e4 LT |
153 | } |
154 | ||
33a48927 | 155 | static struct tcf_proto *tcf_proto_create(const char *kind, u32 protocol, |
c35a4acc AA |
156 | u32 prio, struct tcf_chain *chain, |
157 | struct netlink_ext_ack *extack) | |
33a48927 JP |
158 | { |
159 | struct tcf_proto *tp; | |
160 | int err; | |
161 | ||
162 | tp = kzalloc(sizeof(*tp), GFP_KERNEL); | |
163 | if (!tp) | |
164 | return ERR_PTR(-ENOBUFS); | |
165 | ||
f34e8bff JP |
166 | tp->ops = tcf_proto_lookup_ops(kind, extack); |
167 | if (IS_ERR(tp->ops)) { | |
168 | err = PTR_ERR(tp->ops); | |
d68d75fd | 169 | goto errout; |
33a48927 JP |
170 | } |
171 | tp->classify = tp->ops->classify; | |
172 | tp->protocol = protocol; | |
173 | tp->prio = prio; | |
5bc17018 | 174 | tp->chain = chain; |
33a48927 JP |
175 | |
176 | err = tp->ops->init(tp); | |
177 | if (err) { | |
178 | module_put(tp->ops->owner); | |
179 | goto errout; | |
180 | } | |
181 | return tp; | |
182 | ||
183 | errout: | |
184 | kfree(tp); | |
185 | return ERR_PTR(err); | |
186 | } | |
187 | ||
715df5ec JK |
188 | static void tcf_proto_destroy(struct tcf_proto *tp, |
189 | struct netlink_ext_ack *extack) | |
cf1facda | 190 | { |
715df5ec | 191 | tp->ops->destroy(tp, extack); |
763dbf63 WC |
192 | module_put(tp->ops->owner); |
193 | kfree_rcu(tp, rcu); | |
cf1facda JP |
194 | } |
195 | ||
a9b19443 JP |
196 | struct tcf_filter_chain_list_item { |
197 | struct list_head list; | |
198 | tcf_chain_head_change_t *chain_head_change; | |
199 | void *chain_head_change_priv; | |
200 | }; | |
201 | ||
5bc17018 JP |
202 | static struct tcf_chain *tcf_chain_create(struct tcf_block *block, |
203 | u32 chain_index) | |
2190d1d0 | 204 | { |
5bc17018 JP |
205 | struct tcf_chain *chain; |
206 | ||
207 | chain = kzalloc(sizeof(*chain), GFP_KERNEL); | |
208 | if (!chain) | |
209 | return NULL; | |
210 | list_add_tail(&chain->list, &block->chain_list); | |
211 | chain->block = block; | |
212 | chain->index = chain_index; | |
e2ef7544 | 213 | chain->refcnt = 1; |
f71e0ca4 JP |
214 | if (!chain->index) |
215 | block->chain0.chain = chain; | |
5bc17018 | 216 | return chain; |
2190d1d0 JP |
217 | } |
218 | ||
a9b19443 JP |
219 | static void tcf_chain_head_change_item(struct tcf_filter_chain_list_item *item, |
220 | struct tcf_proto *tp_head) | |
221 | { | |
222 | if (item->chain_head_change) | |
223 | item->chain_head_change(tp_head, item->chain_head_change_priv); | |
224 | } | |
f71e0ca4 JP |
225 | |
226 | static void tcf_chain0_head_change(struct tcf_chain *chain, | |
227 | struct tcf_proto *tp_head) | |
c7eb7d72 | 228 | { |
a9b19443 | 229 | struct tcf_filter_chain_list_item *item; |
f71e0ca4 | 230 | struct tcf_block *block = chain->block; |
a9b19443 | 231 | |
f71e0ca4 JP |
232 | if (chain->index) |
233 | return; | |
234 | list_for_each_entry(item, &block->chain0.filter_chain_list, list) | |
a9b19443 | 235 | tcf_chain_head_change_item(item, tp_head); |
c7eb7d72 JP |
236 | } |
237 | ||
f93e1cdc JP |
238 | static void tcf_chain_destroy(struct tcf_chain *chain) |
239 | { | |
efbf7897 CW |
240 | struct tcf_block *block = chain->block; |
241 | ||
e2ef7544 | 242 | list_del(&chain->list); |
f71e0ca4 JP |
243 | if (!chain->index) |
244 | block->chain0.chain = NULL; | |
e2ef7544 | 245 | kfree(chain); |
cfebd7e2 | 246 | if (list_empty(&block->chain_list) && !refcount_read(&block->refcnt)) |
0607e439 | 247 | kfree_rcu(block, rcu); |
e2ef7544 | 248 | } |
744a4cf6 | 249 | |
e2ef7544 CW |
250 | static void tcf_chain_hold(struct tcf_chain *chain) |
251 | { | |
252 | ++chain->refcnt; | |
2190d1d0 JP |
253 | } |
254 | ||
3d32f4c5 | 255 | static bool tcf_chain_held_by_acts_only(struct tcf_chain *chain) |
1f3ed383 JP |
256 | { |
257 | /* In case all the references are action references, this | |
3d32f4c5 | 258 | * chain should not be shown to the user. |
1f3ed383 JP |
259 | */ |
260 | return chain->refcnt == chain->action_refcnt; | |
261 | } | |
262 | ||
32a4f5ec JP |
263 | static struct tcf_chain *tcf_chain_lookup(struct tcf_block *block, |
264 | u32 chain_index) | |
5bc17018 JP |
265 | { |
266 | struct tcf_chain *chain; | |
267 | ||
268 | list_for_each_entry(chain, &block->chain_list, list) { | |
32a4f5ec | 269 | if (chain->index == chain_index) |
e2ef7544 | 270 | return chain; |
32a4f5ec JP |
271 | } |
272 | return NULL; | |
273 | } | |
274 | ||
275 | static int tc_chain_notify(struct tcf_chain *chain, struct sk_buff *oskb, | |
276 | u32 seq, u16 flags, int event, bool unicast); | |
277 | ||
53681407 JP |
278 | static struct tcf_chain *__tcf_chain_get(struct tcf_block *block, |
279 | u32 chain_index, bool create, | |
280 | bool by_act) | |
32a4f5ec JP |
281 | { |
282 | struct tcf_chain *chain = tcf_chain_lookup(block, chain_index); | |
283 | ||
284 | if (chain) { | |
285 | tcf_chain_hold(chain); | |
53681407 JP |
286 | } else { |
287 | if (!create) | |
288 | return NULL; | |
289 | chain = tcf_chain_create(block, chain_index); | |
290 | if (!chain) | |
291 | return NULL; | |
5bc17018 | 292 | } |
80532384 | 293 | |
53681407 JP |
294 | if (by_act) |
295 | ++chain->action_refcnt; | |
296 | ||
297 | /* Send notification only in case we got the first | |
298 | * non-action reference. Until then, the chain acts only as | |
299 | * a placeholder for actions pointing to it and user ought | |
300 | * not know about them. | |
301 | */ | |
302 | if (chain->refcnt - chain->action_refcnt == 1 && !by_act) | |
303 | tc_chain_notify(chain, NULL, 0, NLM_F_CREATE | NLM_F_EXCL, | |
304 | RTM_NEWCHAIN, false); | |
305 | ||
32a4f5ec | 306 | return chain; |
5bc17018 | 307 | } |
53681407 | 308 | |
290b1c8b JP |
309 | static struct tcf_chain *tcf_chain_get(struct tcf_block *block, u32 chain_index, |
310 | bool create) | |
53681407 JP |
311 | { |
312 | return __tcf_chain_get(block, chain_index, create, false); | |
313 | } | |
5bc17018 | 314 | |
1f3ed383 JP |
315 | struct tcf_chain *tcf_chain_get_by_act(struct tcf_block *block, u32 chain_index) |
316 | { | |
53681407 | 317 | return __tcf_chain_get(block, chain_index, true, true); |
1f3ed383 JP |
318 | } |
319 | EXPORT_SYMBOL(tcf_chain_get_by_act); | |
320 | ||
9f407f17 JP |
321 | static void tc_chain_tmplt_del(struct tcf_chain *chain); |
322 | ||
53681407 | 323 | static void __tcf_chain_put(struct tcf_chain *chain, bool by_act) |
5bc17018 | 324 | { |
53681407 JP |
325 | if (by_act) |
326 | chain->action_refcnt--; | |
327 | chain->refcnt--; | |
328 | ||
329 | /* The last dropped non-action reference will trigger notification. */ | |
330 | if (chain->refcnt - chain->action_refcnt == 0 && !by_act) | |
32a4f5ec | 331 | tc_chain_notify(chain, NULL, 0, 0, RTM_DELCHAIN, false); |
53681407 JP |
332 | |
333 | if (chain->refcnt == 0) { | |
9f407f17 | 334 | tc_chain_tmplt_del(chain); |
5bc17018 | 335 | tcf_chain_destroy(chain); |
32a4f5ec | 336 | } |
5bc17018 | 337 | } |
53681407 | 338 | |
290b1c8b | 339 | static void tcf_chain_put(struct tcf_chain *chain) |
53681407 JP |
340 | { |
341 | __tcf_chain_put(chain, false); | |
342 | } | |
5bc17018 | 343 | |
1f3ed383 JP |
344 | void tcf_chain_put_by_act(struct tcf_chain *chain) |
345 | { | |
53681407 | 346 | __tcf_chain_put(chain, true); |
1f3ed383 JP |
347 | } |
348 | EXPORT_SYMBOL(tcf_chain_put_by_act); | |
349 | ||
32a4f5ec JP |
350 | static void tcf_chain_put_explicitly_created(struct tcf_chain *chain) |
351 | { | |
352 | if (chain->explicitly_created) | |
353 | tcf_chain_put(chain); | |
354 | } | |
355 | ||
290b1c8b JP |
356 | static void tcf_chain_flush(struct tcf_chain *chain) |
357 | { | |
358 | struct tcf_proto *tp = rtnl_dereference(chain->filter_chain); | |
359 | ||
360 | tcf_chain0_head_change(chain, NULL); | |
361 | while (tp) { | |
362 | RCU_INIT_POINTER(chain->filter_chain, tp->next); | |
363 | tcf_proto_destroy(tp, NULL); | |
364 | tp = rtnl_dereference(chain->filter_chain); | |
365 | tcf_chain_put(chain); | |
366 | } | |
367 | } | |
368 | ||
7f76fa36 JH |
369 | static struct tcf_block *tc_dev_ingress_block(struct net_device *dev) |
370 | { | |
371 | const struct Qdisc_class_ops *cops; | |
372 | struct Qdisc *qdisc; | |
373 | ||
374 | if (!dev_ingress_queue(dev)) | |
375 | return NULL; | |
376 | ||
377 | qdisc = dev_ingress_queue(dev)->qdisc_sleeping; | |
378 | if (!qdisc) | |
379 | return NULL; | |
380 | ||
381 | cops = qdisc->ops->cl_ops; | |
382 | if (!cops) | |
383 | return NULL; | |
384 | ||
385 | if (!cops->tcf_block) | |
386 | return NULL; | |
387 | ||
388 | return cops->tcf_block(qdisc, TC_H_MIN_INGRESS, NULL); | |
389 | } | |
390 | ||
391 | static struct rhashtable indr_setup_block_ht; | |
392 | ||
393 | struct tc_indr_block_dev { | |
394 | struct rhash_head ht_node; | |
395 | struct net_device *dev; | |
396 | unsigned int refcnt; | |
397 | struct list_head cb_list; | |
398 | struct tcf_block *block; | |
399 | }; | |
400 | ||
401 | struct tc_indr_block_cb { | |
402 | struct list_head list; | |
403 | void *cb_priv; | |
404 | tc_indr_block_bind_cb_t *cb; | |
405 | void *cb_ident; | |
406 | }; | |
407 | ||
408 | static const struct rhashtable_params tc_indr_setup_block_ht_params = { | |
409 | .key_offset = offsetof(struct tc_indr_block_dev, dev), | |
410 | .head_offset = offsetof(struct tc_indr_block_dev, ht_node), | |
411 | .key_len = sizeof(struct net_device *), | |
412 | }; | |
413 | ||
414 | static struct tc_indr_block_dev * | |
415 | tc_indr_block_dev_lookup(struct net_device *dev) | |
416 | { | |
417 | return rhashtable_lookup_fast(&indr_setup_block_ht, &dev, | |
418 | tc_indr_setup_block_ht_params); | |
419 | } | |
420 | ||
421 | static struct tc_indr_block_dev *tc_indr_block_dev_get(struct net_device *dev) | |
422 | { | |
423 | struct tc_indr_block_dev *indr_dev; | |
424 | ||
425 | indr_dev = tc_indr_block_dev_lookup(dev); | |
426 | if (indr_dev) | |
427 | goto inc_ref; | |
428 | ||
429 | indr_dev = kzalloc(sizeof(*indr_dev), GFP_KERNEL); | |
430 | if (!indr_dev) | |
431 | return NULL; | |
432 | ||
433 | INIT_LIST_HEAD(&indr_dev->cb_list); | |
434 | indr_dev->dev = dev; | |
435 | indr_dev->block = tc_dev_ingress_block(dev); | |
436 | if (rhashtable_insert_fast(&indr_setup_block_ht, &indr_dev->ht_node, | |
437 | tc_indr_setup_block_ht_params)) { | |
438 | kfree(indr_dev); | |
439 | return NULL; | |
440 | } | |
441 | ||
442 | inc_ref: | |
443 | indr_dev->refcnt++; | |
444 | return indr_dev; | |
445 | } | |
446 | ||
447 | static void tc_indr_block_dev_put(struct tc_indr_block_dev *indr_dev) | |
448 | { | |
449 | if (--indr_dev->refcnt) | |
450 | return; | |
451 | ||
452 | rhashtable_remove_fast(&indr_setup_block_ht, &indr_dev->ht_node, | |
453 | tc_indr_setup_block_ht_params); | |
454 | kfree(indr_dev); | |
455 | } | |
456 | ||
457 | static struct tc_indr_block_cb * | |
458 | tc_indr_block_cb_lookup(struct tc_indr_block_dev *indr_dev, | |
459 | tc_indr_block_bind_cb_t *cb, void *cb_ident) | |
460 | { | |
461 | struct tc_indr_block_cb *indr_block_cb; | |
462 | ||
463 | list_for_each_entry(indr_block_cb, &indr_dev->cb_list, list) | |
464 | if (indr_block_cb->cb == cb && | |
465 | indr_block_cb->cb_ident == cb_ident) | |
466 | return indr_block_cb; | |
467 | return NULL; | |
468 | } | |
469 | ||
470 | static struct tc_indr_block_cb * | |
471 | tc_indr_block_cb_add(struct tc_indr_block_dev *indr_dev, void *cb_priv, | |
472 | tc_indr_block_bind_cb_t *cb, void *cb_ident) | |
473 | { | |
474 | struct tc_indr_block_cb *indr_block_cb; | |
475 | ||
476 | indr_block_cb = tc_indr_block_cb_lookup(indr_dev, cb, cb_ident); | |
477 | if (indr_block_cb) | |
478 | return ERR_PTR(-EEXIST); | |
479 | ||
480 | indr_block_cb = kzalloc(sizeof(*indr_block_cb), GFP_KERNEL); | |
481 | if (!indr_block_cb) | |
482 | return ERR_PTR(-ENOMEM); | |
483 | ||
484 | indr_block_cb->cb_priv = cb_priv; | |
485 | indr_block_cb->cb = cb; | |
486 | indr_block_cb->cb_ident = cb_ident; | |
487 | list_add(&indr_block_cb->list, &indr_dev->cb_list); | |
488 | ||
489 | return indr_block_cb; | |
490 | } | |
491 | ||
492 | static void tc_indr_block_cb_del(struct tc_indr_block_cb *indr_block_cb) | |
493 | { | |
494 | list_del(&indr_block_cb->list); | |
495 | kfree(indr_block_cb); | |
496 | } | |
497 | ||
498 | static void tc_indr_block_ing_cmd(struct tc_indr_block_dev *indr_dev, | |
499 | struct tc_indr_block_cb *indr_block_cb, | |
500 | enum tc_block_command command) | |
501 | { | |
502 | struct tc_block_offload bo = { | |
503 | .command = command, | |
504 | .binder_type = TCF_BLOCK_BINDER_TYPE_CLSACT_INGRESS, | |
505 | .block = indr_dev->block, | |
506 | }; | |
507 | ||
508 | if (!indr_dev->block) | |
509 | return; | |
510 | ||
511 | indr_block_cb->cb(indr_dev->dev, indr_block_cb->cb_priv, TC_SETUP_BLOCK, | |
512 | &bo); | |
513 | } | |
514 | ||
515 | int __tc_indr_block_cb_register(struct net_device *dev, void *cb_priv, | |
516 | tc_indr_block_bind_cb_t *cb, void *cb_ident) | |
517 | { | |
518 | struct tc_indr_block_cb *indr_block_cb; | |
519 | struct tc_indr_block_dev *indr_dev; | |
520 | int err; | |
521 | ||
522 | indr_dev = tc_indr_block_dev_get(dev); | |
523 | if (!indr_dev) | |
524 | return -ENOMEM; | |
525 | ||
526 | indr_block_cb = tc_indr_block_cb_add(indr_dev, cb_priv, cb, cb_ident); | |
527 | err = PTR_ERR_OR_ZERO(indr_block_cb); | |
528 | if (err) | |
529 | goto err_dev_put; | |
530 | ||
531 | tc_indr_block_ing_cmd(indr_dev, indr_block_cb, TC_BLOCK_BIND); | |
532 | return 0; | |
533 | ||
534 | err_dev_put: | |
535 | tc_indr_block_dev_put(indr_dev); | |
536 | return err; | |
537 | } | |
538 | EXPORT_SYMBOL_GPL(__tc_indr_block_cb_register); | |
539 | ||
540 | int tc_indr_block_cb_register(struct net_device *dev, void *cb_priv, | |
541 | tc_indr_block_bind_cb_t *cb, void *cb_ident) | |
542 | { | |
543 | int err; | |
544 | ||
545 | rtnl_lock(); | |
546 | err = __tc_indr_block_cb_register(dev, cb_priv, cb, cb_ident); | |
547 | rtnl_unlock(); | |
548 | ||
549 | return err; | |
550 | } | |
551 | EXPORT_SYMBOL_GPL(tc_indr_block_cb_register); | |
552 | ||
553 | void __tc_indr_block_cb_unregister(struct net_device *dev, | |
554 | tc_indr_block_bind_cb_t *cb, void *cb_ident) | |
555 | { | |
556 | struct tc_indr_block_cb *indr_block_cb; | |
557 | struct tc_indr_block_dev *indr_dev; | |
558 | ||
559 | indr_dev = tc_indr_block_dev_lookup(dev); | |
560 | if (!indr_dev) | |
561 | return; | |
562 | ||
563 | indr_block_cb = tc_indr_block_cb_lookup(indr_dev, cb, cb_ident); | |
564 | if (!indr_block_cb) | |
565 | return; | |
566 | ||
567 | /* Send unbind message if required to free any block cbs. */ | |
568 | tc_indr_block_ing_cmd(indr_dev, indr_block_cb, TC_BLOCK_UNBIND); | |
569 | tc_indr_block_cb_del(indr_block_cb); | |
570 | tc_indr_block_dev_put(indr_dev); | |
571 | } | |
572 | EXPORT_SYMBOL_GPL(__tc_indr_block_cb_unregister); | |
573 | ||
574 | void tc_indr_block_cb_unregister(struct net_device *dev, | |
575 | tc_indr_block_bind_cb_t *cb, void *cb_ident) | |
576 | { | |
577 | rtnl_lock(); | |
578 | __tc_indr_block_cb_unregister(dev, cb, cb_ident); | |
579 | rtnl_unlock(); | |
580 | } | |
581 | EXPORT_SYMBOL_GPL(tc_indr_block_cb_unregister); | |
582 | ||
583 | static void tc_indr_block_call(struct tcf_block *block, struct net_device *dev, | |
584 | struct tcf_block_ext_info *ei, | |
585 | enum tc_block_command command, | |
586 | struct netlink_ext_ack *extack) | |
587 | { | |
588 | struct tc_indr_block_cb *indr_block_cb; | |
589 | struct tc_indr_block_dev *indr_dev; | |
590 | struct tc_block_offload bo = { | |
591 | .command = command, | |
592 | .binder_type = ei->binder_type, | |
593 | .block = block, | |
594 | .extack = extack, | |
595 | }; | |
596 | ||
597 | indr_dev = tc_indr_block_dev_lookup(dev); | |
598 | if (!indr_dev) | |
599 | return; | |
600 | ||
601 | indr_dev->block = command == TC_BLOCK_BIND ? block : NULL; | |
602 | ||
603 | list_for_each_entry(indr_block_cb, &indr_dev->cb_list, list) | |
604 | indr_block_cb->cb(dev, indr_block_cb->cb_priv, TC_SETUP_BLOCK, | |
605 | &bo); | |
606 | } | |
607 | ||
caa72601 JP |
608 | static bool tcf_block_offload_in_use(struct tcf_block *block) |
609 | { | |
610 | return block->offloadcnt; | |
611 | } | |
612 | ||
613 | static int tcf_block_offload_cmd(struct tcf_block *block, | |
614 | struct net_device *dev, | |
615 | struct tcf_block_ext_info *ei, | |
60513bd8 JH |
616 | enum tc_block_command command, |
617 | struct netlink_ext_ack *extack) | |
8c4083b3 | 618 | { |
8c4083b3 JP |
619 | struct tc_block_offload bo = {}; |
620 | ||
8c4083b3 JP |
621 | bo.command = command; |
622 | bo.binder_type = ei->binder_type; | |
623 | bo.block = block; | |
60513bd8 | 624 | bo.extack = extack; |
caa72601 | 625 | return dev->netdev_ops->ndo_setup_tc(dev, TC_SETUP_BLOCK, &bo); |
8c4083b3 JP |
626 | } |
627 | ||
caa72601 | 628 | static int tcf_block_offload_bind(struct tcf_block *block, struct Qdisc *q, |
60513bd8 JH |
629 | struct tcf_block_ext_info *ei, |
630 | struct netlink_ext_ack *extack) | |
8c4083b3 | 631 | { |
caa72601 JP |
632 | struct net_device *dev = q->dev_queue->dev; |
633 | int err; | |
634 | ||
635 | if (!dev->netdev_ops->ndo_setup_tc) | |
636 | goto no_offload_dev_inc; | |
637 | ||
638 | /* If tc offload feature is disabled and the block we try to bind | |
639 | * to already has some offloaded filters, forbid to bind. | |
640 | */ | |
60513bd8 JH |
641 | if (!tc_can_offload(dev) && tcf_block_offload_in_use(block)) { |
642 | NL_SET_ERR_MSG(extack, "Bind to offloaded block failed as dev has offload disabled"); | |
caa72601 | 643 | return -EOPNOTSUPP; |
60513bd8 | 644 | } |
caa72601 | 645 | |
60513bd8 | 646 | err = tcf_block_offload_cmd(block, dev, ei, TC_BLOCK_BIND, extack); |
caa72601 JP |
647 | if (err == -EOPNOTSUPP) |
648 | goto no_offload_dev_inc; | |
7f76fa36 JH |
649 | if (err) |
650 | return err; | |
651 | ||
652 | tc_indr_block_call(block, dev, ei, TC_BLOCK_BIND, extack); | |
653 | return 0; | |
caa72601 JP |
654 | |
655 | no_offload_dev_inc: | |
656 | if (tcf_block_offload_in_use(block)) | |
657 | return -EOPNOTSUPP; | |
658 | block->nooffloaddevcnt++; | |
7f76fa36 | 659 | tc_indr_block_call(block, dev, ei, TC_BLOCK_BIND, extack); |
caa72601 | 660 | return 0; |
8c4083b3 JP |
661 | } |
662 | ||
663 | static void tcf_block_offload_unbind(struct tcf_block *block, struct Qdisc *q, | |
664 | struct tcf_block_ext_info *ei) | |
665 | { | |
caa72601 JP |
666 | struct net_device *dev = q->dev_queue->dev; |
667 | int err; | |
668 | ||
7f76fa36 JH |
669 | tc_indr_block_call(block, dev, ei, TC_BLOCK_UNBIND, NULL); |
670 | ||
caa72601 JP |
671 | if (!dev->netdev_ops->ndo_setup_tc) |
672 | goto no_offload_dev_dec; | |
60513bd8 | 673 | err = tcf_block_offload_cmd(block, dev, ei, TC_BLOCK_UNBIND, NULL); |
caa72601 JP |
674 | if (err == -EOPNOTSUPP) |
675 | goto no_offload_dev_dec; | |
676 | return; | |
677 | ||
678 | no_offload_dev_dec: | |
679 | WARN_ON(block->nooffloaddevcnt-- == 0); | |
8c4083b3 JP |
680 | } |
681 | ||
a9b19443 | 682 | static int |
f71e0ca4 JP |
683 | tcf_chain0_head_change_cb_add(struct tcf_block *block, |
684 | struct tcf_block_ext_info *ei, | |
685 | struct netlink_ext_ack *extack) | |
a9b19443 | 686 | { |
f71e0ca4 | 687 | struct tcf_chain *chain0 = block->chain0.chain; |
a9b19443 JP |
688 | struct tcf_filter_chain_list_item *item; |
689 | ||
690 | item = kmalloc(sizeof(*item), GFP_KERNEL); | |
691 | if (!item) { | |
692 | NL_SET_ERR_MSG(extack, "Memory allocation for head change callback item failed"); | |
693 | return -ENOMEM; | |
694 | } | |
695 | item->chain_head_change = ei->chain_head_change; | |
696 | item->chain_head_change_priv = ei->chain_head_change_priv; | |
f71e0ca4 JP |
697 | if (chain0 && chain0->filter_chain) |
698 | tcf_chain_head_change_item(item, chain0->filter_chain); | |
699 | list_add(&item->list, &block->chain0.filter_chain_list); | |
a9b19443 JP |
700 | return 0; |
701 | } | |
702 | ||
703 | static void | |
f71e0ca4 JP |
704 | tcf_chain0_head_change_cb_del(struct tcf_block *block, |
705 | struct tcf_block_ext_info *ei) | |
a9b19443 | 706 | { |
f71e0ca4 | 707 | struct tcf_chain *chain0 = block->chain0.chain; |
a9b19443 JP |
708 | struct tcf_filter_chain_list_item *item; |
709 | ||
f71e0ca4 | 710 | list_for_each_entry(item, &block->chain0.filter_chain_list, list) { |
a9b19443 JP |
711 | if ((!ei->chain_head_change && !ei->chain_head_change_priv) || |
712 | (item->chain_head_change == ei->chain_head_change && | |
713 | item->chain_head_change_priv == ei->chain_head_change_priv)) { | |
f71e0ca4 JP |
714 | if (chain0) |
715 | tcf_chain_head_change_item(item, NULL); | |
a9b19443 JP |
716 | list_del(&item->list); |
717 | kfree(item); | |
718 | return; | |
719 | } | |
720 | } | |
721 | WARN_ON(1); | |
722 | } | |
723 | ||
48617387 | 724 | struct tcf_net { |
ab281629 | 725 | spinlock_t idr_lock; /* Protects idr */ |
48617387 JP |
726 | struct idr idr; |
727 | }; | |
728 | ||
729 | static unsigned int tcf_net_id; | |
730 | ||
731 | static int tcf_block_insert(struct tcf_block *block, struct net *net, | |
bb047ddd | 732 | struct netlink_ext_ack *extack) |
a9b19443 | 733 | { |
48617387 | 734 | struct tcf_net *tn = net_generic(net, tcf_net_id); |
ab281629 VB |
735 | int err; |
736 | ||
737 | idr_preload(GFP_KERNEL); | |
738 | spin_lock(&tn->idr_lock); | |
739 | err = idr_alloc_u32(&tn->idr, block, &block->index, block->index, | |
740 | GFP_NOWAIT); | |
741 | spin_unlock(&tn->idr_lock); | |
742 | idr_preload_end(); | |
48617387 | 743 | |
ab281629 | 744 | return err; |
a9b19443 JP |
745 | } |
746 | ||
48617387 JP |
747 | static void tcf_block_remove(struct tcf_block *block, struct net *net) |
748 | { | |
749 | struct tcf_net *tn = net_generic(net, tcf_net_id); | |
750 | ||
ab281629 | 751 | spin_lock(&tn->idr_lock); |
9c160941 | 752 | idr_remove(&tn->idr, block->index); |
ab281629 | 753 | spin_unlock(&tn->idr_lock); |
48617387 JP |
754 | } |
755 | ||
756 | static struct tcf_block *tcf_block_create(struct net *net, struct Qdisc *q, | |
bb047ddd | 757 | u32 block_index, |
48617387 | 758 | struct netlink_ext_ack *extack) |
6529eaba | 759 | { |
48617387 | 760 | struct tcf_block *block; |
6529eaba | 761 | |
48617387 | 762 | block = kzalloc(sizeof(*block), GFP_KERNEL); |
8d1a77f9 AA |
763 | if (!block) { |
764 | NL_SET_ERR_MSG(extack, "Memory allocation for block failed"); | |
48617387 | 765 | return ERR_PTR(-ENOMEM); |
8d1a77f9 | 766 | } |
5bc17018 | 767 | INIT_LIST_HEAD(&block->chain_list); |
acb67442 | 768 | INIT_LIST_HEAD(&block->cb_list); |
f36fe1c4 | 769 | INIT_LIST_HEAD(&block->owner_list); |
f71e0ca4 | 770 | INIT_LIST_HEAD(&block->chain0.filter_chain_list); |
acb67442 | 771 | |
cfebd7e2 | 772 | refcount_set(&block->refcnt, 1); |
48617387 | 773 | block->net = net; |
bb047ddd JP |
774 | block->index = block_index; |
775 | ||
776 | /* Don't store q pointer for blocks which are shared */ | |
777 | if (!tcf_block_shared(block)) | |
778 | block->q = q; | |
48617387 | 779 | return block; |
48617387 JP |
780 | } |
781 | ||
782 | static struct tcf_block *tcf_block_lookup(struct net *net, u32 block_index) | |
783 | { | |
784 | struct tcf_net *tn = net_generic(net, tcf_net_id); | |
785 | ||
322d884b | 786 | return idr_find(&tn->idr, block_index); |
48617387 JP |
787 | } |
788 | ||
0607e439 VB |
789 | static struct tcf_block *tcf_block_refcnt_get(struct net *net, u32 block_index) |
790 | { | |
791 | struct tcf_block *block; | |
792 | ||
793 | rcu_read_lock(); | |
794 | block = tcf_block_lookup(net, block_index); | |
795 | if (block && !refcount_inc_not_zero(&block->refcnt)) | |
796 | block = NULL; | |
797 | rcu_read_unlock(); | |
798 | ||
799 | return block; | |
800 | } | |
801 | ||
f0023436 VB |
802 | static void tcf_block_flush_all_chains(struct tcf_block *block) |
803 | { | |
804 | struct tcf_chain *chain; | |
805 | ||
806 | /* Hold a refcnt for all chains, so that they don't disappear | |
807 | * while we are iterating. | |
808 | */ | |
809 | list_for_each_entry(chain, &block->chain_list, list) | |
810 | tcf_chain_hold(chain); | |
811 | ||
812 | list_for_each_entry(chain, &block->chain_list, list) | |
813 | tcf_chain_flush(chain); | |
814 | } | |
815 | ||
816 | static void tcf_block_put_all_chains(struct tcf_block *block) | |
817 | { | |
818 | struct tcf_chain *chain, *tmp; | |
819 | ||
820 | /* At this point, all the chains should have refcnt >= 1. */ | |
821 | list_for_each_entry_safe(chain, tmp, &block->chain_list, list) { | |
822 | tcf_chain_put_explicitly_created(chain); | |
823 | tcf_chain_put(chain); | |
824 | } | |
825 | } | |
826 | ||
0607e439 VB |
827 | static void __tcf_block_put(struct tcf_block *block, struct Qdisc *q, |
828 | struct tcf_block_ext_info *ei) | |
829 | { | |
830 | if (refcount_dec_and_test(&block->refcnt)) { | |
831 | /* Flushing/putting all chains will cause the block to be | |
832 | * deallocated when last chain is freed. However, if chain_list | |
833 | * is empty, block has to be manually deallocated. After block | |
834 | * reference counter reached 0, it is no longer possible to | |
835 | * increment it or add new chains to block. | |
836 | */ | |
837 | bool free_block = list_empty(&block->chain_list); | |
838 | ||
839 | if (tcf_block_shared(block)) | |
840 | tcf_block_remove(block, block->net); | |
841 | if (!free_block) | |
842 | tcf_block_flush_all_chains(block); | |
843 | ||
844 | if (q) | |
845 | tcf_block_offload_unbind(block, q, ei); | |
846 | ||
847 | if (free_block) | |
848 | kfree_rcu(block, rcu); | |
849 | else | |
850 | tcf_block_put_all_chains(block); | |
851 | } else if (q) { | |
852 | tcf_block_offload_unbind(block, q, ei); | |
853 | } | |
854 | } | |
855 | ||
856 | static void tcf_block_refcnt_put(struct tcf_block *block) | |
857 | { | |
858 | __tcf_block_put(block, NULL, NULL); | |
859 | } | |
860 | ||
c431f89b VB |
861 | /* Find tcf block. |
862 | * Set q, parent, cl when appropriate. | |
863 | */ | |
864 | ||
865 | static struct tcf_block *tcf_block_find(struct net *net, struct Qdisc **q, | |
866 | u32 *parent, unsigned long *cl, | |
867 | int ifindex, u32 block_index, | |
868 | struct netlink_ext_ack *extack) | |
869 | { | |
870 | struct tcf_block *block; | |
e368fdb6 | 871 | int err = 0; |
c431f89b VB |
872 | |
873 | if (ifindex == TCM_IFINDEX_MAGIC_BLOCK) { | |
787ce6d0 | 874 | block = tcf_block_refcnt_get(net, block_index); |
c431f89b VB |
875 | if (!block) { |
876 | NL_SET_ERR_MSG(extack, "Block of given index was not found"); | |
877 | return ERR_PTR(-EINVAL); | |
878 | } | |
879 | } else { | |
880 | const struct Qdisc_class_ops *cops; | |
881 | struct net_device *dev; | |
882 | ||
e368fdb6 VB |
883 | rcu_read_lock(); |
884 | ||
c431f89b | 885 | /* Find link */ |
e368fdb6 VB |
886 | dev = dev_get_by_index_rcu(net, ifindex); |
887 | if (!dev) { | |
888 | rcu_read_unlock(); | |
c431f89b | 889 | return ERR_PTR(-ENODEV); |
e368fdb6 | 890 | } |
c431f89b VB |
891 | |
892 | /* Find qdisc */ | |
893 | if (!*parent) { | |
894 | *q = dev->qdisc; | |
895 | *parent = (*q)->handle; | |
896 | } else { | |
e368fdb6 | 897 | *q = qdisc_lookup_rcu(dev, TC_H_MAJ(*parent)); |
c431f89b VB |
898 | if (!*q) { |
899 | NL_SET_ERR_MSG(extack, "Parent Qdisc doesn't exists"); | |
e368fdb6 VB |
900 | err = -EINVAL; |
901 | goto errout_rcu; | |
c431f89b VB |
902 | } |
903 | } | |
904 | ||
e368fdb6 VB |
905 | *q = qdisc_refcount_inc_nz(*q); |
906 | if (!*q) { | |
907 | NL_SET_ERR_MSG(extack, "Parent Qdisc doesn't exists"); | |
908 | err = -EINVAL; | |
909 | goto errout_rcu; | |
910 | } | |
911 | ||
c431f89b VB |
912 | /* Is it classful? */ |
913 | cops = (*q)->ops->cl_ops; | |
914 | if (!cops) { | |
915 | NL_SET_ERR_MSG(extack, "Qdisc not classful"); | |
e368fdb6 VB |
916 | err = -EINVAL; |
917 | goto errout_rcu; | |
c431f89b VB |
918 | } |
919 | ||
920 | if (!cops->tcf_block) { | |
921 | NL_SET_ERR_MSG(extack, "Class doesn't support blocks"); | |
e368fdb6 VB |
922 | err = -EOPNOTSUPP; |
923 | goto errout_rcu; | |
c431f89b VB |
924 | } |
925 | ||
e368fdb6 VB |
926 | /* At this point we know that qdisc is not noop_qdisc, |
927 | * which means that qdisc holds a reference to net_device | |
928 | * and we hold a reference to qdisc, so it is safe to release | |
929 | * rcu read lock. | |
930 | */ | |
931 | rcu_read_unlock(); | |
932 | ||
c431f89b VB |
933 | /* Do we search for filter, attached to class? */ |
934 | if (TC_H_MIN(*parent)) { | |
935 | *cl = cops->find(*q, *parent); | |
936 | if (*cl == 0) { | |
937 | NL_SET_ERR_MSG(extack, "Specified class doesn't exist"); | |
e368fdb6 VB |
938 | err = -ENOENT; |
939 | goto errout_qdisc; | |
c431f89b VB |
940 | } |
941 | } | |
942 | ||
943 | /* And the last stroke */ | |
944 | block = cops->tcf_block(*q, *cl, extack); | |
e368fdb6 VB |
945 | if (!block) { |
946 | err = -EINVAL; | |
947 | goto errout_qdisc; | |
948 | } | |
c431f89b VB |
949 | if (tcf_block_shared(block)) { |
950 | NL_SET_ERR_MSG(extack, "This filter block is shared. Please use the block index to manipulate the filters"); | |
e368fdb6 VB |
951 | err = -EOPNOTSUPP; |
952 | goto errout_qdisc; | |
c431f89b | 953 | } |
787ce6d0 VB |
954 | |
955 | /* Always take reference to block in order to support execution | |
956 | * of rules update path of cls API without rtnl lock. Caller | |
957 | * must release block when it is finished using it. 'if' block | |
958 | * of this conditional obtain reference to block by calling | |
959 | * tcf_block_refcnt_get(). | |
960 | */ | |
961 | refcount_inc(&block->refcnt); | |
c431f89b VB |
962 | } |
963 | ||
964 | return block; | |
e368fdb6 VB |
965 | |
966 | errout_rcu: | |
967 | rcu_read_unlock(); | |
968 | errout_qdisc: | |
460b3601 | 969 | if (*q) { |
e368fdb6 | 970 | qdisc_put(*q); |
460b3601 CW |
971 | *q = NULL; |
972 | } | |
e368fdb6 VB |
973 | return ERR_PTR(err); |
974 | } | |
975 | ||
976 | static void tcf_block_release(struct Qdisc *q, struct tcf_block *block) | |
977 | { | |
787ce6d0 VB |
978 | if (!IS_ERR_OR_NULL(block)) |
979 | tcf_block_refcnt_put(block); | |
980 | ||
e368fdb6 VB |
981 | if (q) |
982 | qdisc_put(q); | |
c431f89b VB |
983 | } |
984 | ||
f36fe1c4 JP |
985 | struct tcf_block_owner_item { |
986 | struct list_head list; | |
987 | struct Qdisc *q; | |
988 | enum tcf_block_binder_type binder_type; | |
989 | }; | |
990 | ||
991 | static void | |
992 | tcf_block_owner_netif_keep_dst(struct tcf_block *block, | |
993 | struct Qdisc *q, | |
994 | enum tcf_block_binder_type binder_type) | |
995 | { | |
996 | if (block->keep_dst && | |
997 | binder_type != TCF_BLOCK_BINDER_TYPE_CLSACT_INGRESS && | |
998 | binder_type != TCF_BLOCK_BINDER_TYPE_CLSACT_EGRESS) | |
999 | netif_keep_dst(qdisc_dev(q)); | |
1000 | } | |
1001 | ||
1002 | void tcf_block_netif_keep_dst(struct tcf_block *block) | |
1003 | { | |
1004 | struct tcf_block_owner_item *item; | |
1005 | ||
1006 | block->keep_dst = true; | |
1007 | list_for_each_entry(item, &block->owner_list, list) | |
1008 | tcf_block_owner_netif_keep_dst(block, item->q, | |
1009 | item->binder_type); | |
1010 | } | |
1011 | EXPORT_SYMBOL(tcf_block_netif_keep_dst); | |
1012 | ||
1013 | static int tcf_block_owner_add(struct tcf_block *block, | |
1014 | struct Qdisc *q, | |
1015 | enum tcf_block_binder_type binder_type) | |
1016 | { | |
1017 | struct tcf_block_owner_item *item; | |
1018 | ||
1019 | item = kmalloc(sizeof(*item), GFP_KERNEL); | |
1020 | if (!item) | |
1021 | return -ENOMEM; | |
1022 | item->q = q; | |
1023 | item->binder_type = binder_type; | |
1024 | list_add(&item->list, &block->owner_list); | |
1025 | return 0; | |
1026 | } | |
1027 | ||
1028 | static void tcf_block_owner_del(struct tcf_block *block, | |
1029 | struct Qdisc *q, | |
1030 | enum tcf_block_binder_type binder_type) | |
1031 | { | |
1032 | struct tcf_block_owner_item *item; | |
1033 | ||
1034 | list_for_each_entry(item, &block->owner_list, list) { | |
1035 | if (item->q == q && item->binder_type == binder_type) { | |
1036 | list_del(&item->list); | |
1037 | kfree(item); | |
1038 | return; | |
1039 | } | |
1040 | } | |
1041 | WARN_ON(1); | |
1042 | } | |
1043 | ||
48617387 JP |
1044 | int tcf_block_get_ext(struct tcf_block **p_block, struct Qdisc *q, |
1045 | struct tcf_block_ext_info *ei, | |
1046 | struct netlink_ext_ack *extack) | |
1047 | { | |
1048 | struct net *net = qdisc_net(q); | |
1049 | struct tcf_block *block = NULL; | |
48617387 JP |
1050 | int err; |
1051 | ||
787ce6d0 | 1052 | if (ei->block_index) |
48617387 | 1053 | /* block_index not 0 means the shared block is requested */ |
787ce6d0 | 1054 | block = tcf_block_refcnt_get(net, ei->block_index); |
48617387 JP |
1055 | |
1056 | if (!block) { | |
bb047ddd | 1057 | block = tcf_block_create(net, q, ei->block_index, extack); |
48617387 JP |
1058 | if (IS_ERR(block)) |
1059 | return PTR_ERR(block); | |
bb047ddd JP |
1060 | if (tcf_block_shared(block)) { |
1061 | err = tcf_block_insert(block, net, extack); | |
48617387 JP |
1062 | if (err) |
1063 | goto err_block_insert; | |
1064 | } | |
1065 | } | |
1066 | ||
f36fe1c4 JP |
1067 | err = tcf_block_owner_add(block, q, ei->binder_type); |
1068 | if (err) | |
1069 | goto err_block_owner_add; | |
1070 | ||
1071 | tcf_block_owner_netif_keep_dst(block, q, ei->binder_type); | |
1072 | ||
f71e0ca4 | 1073 | err = tcf_chain0_head_change_cb_add(block, ei, extack); |
a9b19443 | 1074 | if (err) |
f71e0ca4 | 1075 | goto err_chain0_head_change_cb_add; |
caa72601 | 1076 | |
60513bd8 | 1077 | err = tcf_block_offload_bind(block, q, ei, extack); |
caa72601 JP |
1078 | if (err) |
1079 | goto err_block_offload_bind; | |
1080 | ||
6529eaba JP |
1081 | *p_block = block; |
1082 | return 0; | |
2190d1d0 | 1083 | |
caa72601 | 1084 | err_block_offload_bind: |
f71e0ca4 JP |
1085 | tcf_chain0_head_change_cb_del(block, ei); |
1086 | err_chain0_head_change_cb_add: | |
f36fe1c4 JP |
1087 | tcf_block_owner_del(block, q, ei->binder_type); |
1088 | err_block_owner_add: | |
48617387 | 1089 | err_block_insert: |
787ce6d0 | 1090 | tcf_block_refcnt_put(block); |
2190d1d0 | 1091 | return err; |
6529eaba | 1092 | } |
8c4083b3 JP |
1093 | EXPORT_SYMBOL(tcf_block_get_ext); |
1094 | ||
c7eb7d72 JP |
1095 | static void tcf_chain_head_change_dflt(struct tcf_proto *tp_head, void *priv) |
1096 | { | |
1097 | struct tcf_proto __rcu **p_filter_chain = priv; | |
1098 | ||
1099 | rcu_assign_pointer(*p_filter_chain, tp_head); | |
1100 | } | |
1101 | ||
8c4083b3 | 1102 | int tcf_block_get(struct tcf_block **p_block, |
8d1a77f9 AA |
1103 | struct tcf_proto __rcu **p_filter_chain, struct Qdisc *q, |
1104 | struct netlink_ext_ack *extack) | |
8c4083b3 | 1105 | { |
c7eb7d72 JP |
1106 | struct tcf_block_ext_info ei = { |
1107 | .chain_head_change = tcf_chain_head_change_dflt, | |
1108 | .chain_head_change_priv = p_filter_chain, | |
1109 | }; | |
8c4083b3 | 1110 | |
c7eb7d72 | 1111 | WARN_ON(!p_filter_chain); |
8d1a77f9 | 1112 | return tcf_block_get_ext(p_block, q, &ei, extack); |
8c4083b3 | 1113 | } |
6529eaba JP |
1114 | EXPORT_SYMBOL(tcf_block_get); |
1115 | ||
7aa0045d | 1116 | /* XXX: Standalone actions are not allowed to jump to any chain, and bound |
a60b3f51 | 1117 | * actions should be all removed after flushing. |
7aa0045d | 1118 | */ |
c7eb7d72 | 1119 | void tcf_block_put_ext(struct tcf_block *block, struct Qdisc *q, |
e1ea2f98 | 1120 | struct tcf_block_ext_info *ei) |
7aa0045d | 1121 | { |
c30abd5e DM |
1122 | if (!block) |
1123 | return; | |
f71e0ca4 | 1124 | tcf_chain0_head_change_cb_del(block, ei); |
f36fe1c4 | 1125 | tcf_block_owner_del(block, q, ei->binder_type); |
a60b3f51 | 1126 | |
0607e439 | 1127 | __tcf_block_put(block, q, ei); |
6529eaba | 1128 | } |
8c4083b3 JP |
1129 | EXPORT_SYMBOL(tcf_block_put_ext); |
1130 | ||
1131 | void tcf_block_put(struct tcf_block *block) | |
1132 | { | |
1133 | struct tcf_block_ext_info ei = {0, }; | |
1134 | ||
4853f128 JP |
1135 | if (!block) |
1136 | return; | |
c7eb7d72 | 1137 | tcf_block_put_ext(block, block->q, &ei); |
8c4083b3 | 1138 | } |
e1ea2f98 | 1139 | |
6529eaba | 1140 | EXPORT_SYMBOL(tcf_block_put); |
cf1facda | 1141 | |
acb67442 JP |
1142 | struct tcf_block_cb { |
1143 | struct list_head list; | |
1144 | tc_setup_cb_t *cb; | |
1145 | void *cb_ident; | |
1146 | void *cb_priv; | |
1147 | unsigned int refcnt; | |
1148 | }; | |
1149 | ||
1150 | void *tcf_block_cb_priv(struct tcf_block_cb *block_cb) | |
1151 | { | |
1152 | return block_cb->cb_priv; | |
1153 | } | |
1154 | EXPORT_SYMBOL(tcf_block_cb_priv); | |
1155 | ||
1156 | struct tcf_block_cb *tcf_block_cb_lookup(struct tcf_block *block, | |
1157 | tc_setup_cb_t *cb, void *cb_ident) | |
1158 | { struct tcf_block_cb *block_cb; | |
1159 | ||
1160 | list_for_each_entry(block_cb, &block->cb_list, list) | |
1161 | if (block_cb->cb == cb && block_cb->cb_ident == cb_ident) | |
1162 | return block_cb; | |
1163 | return NULL; | |
1164 | } | |
1165 | EXPORT_SYMBOL(tcf_block_cb_lookup); | |
1166 | ||
1167 | void tcf_block_cb_incref(struct tcf_block_cb *block_cb) | |
1168 | { | |
1169 | block_cb->refcnt++; | |
1170 | } | |
1171 | EXPORT_SYMBOL(tcf_block_cb_incref); | |
1172 | ||
1173 | unsigned int tcf_block_cb_decref(struct tcf_block_cb *block_cb) | |
1174 | { | |
1175 | return --block_cb->refcnt; | |
1176 | } | |
1177 | EXPORT_SYMBOL(tcf_block_cb_decref); | |
1178 | ||
32636742 JH |
1179 | static int |
1180 | tcf_block_playback_offloads(struct tcf_block *block, tc_setup_cb_t *cb, | |
1181 | void *cb_priv, bool add, bool offload_in_use, | |
1182 | struct netlink_ext_ack *extack) | |
1183 | { | |
1184 | struct tcf_chain *chain; | |
1185 | struct tcf_proto *tp; | |
1186 | int err; | |
1187 | ||
1188 | list_for_each_entry(chain, &block->chain_list, list) { | |
1189 | for (tp = rtnl_dereference(chain->filter_chain); tp; | |
1190 | tp = rtnl_dereference(tp->next)) { | |
1191 | if (tp->ops->reoffload) { | |
1192 | err = tp->ops->reoffload(tp, add, cb, cb_priv, | |
1193 | extack); | |
1194 | if (err && add) | |
1195 | goto err_playback_remove; | |
1196 | } else if (add && offload_in_use) { | |
1197 | err = -EOPNOTSUPP; | |
1198 | NL_SET_ERR_MSG(extack, "Filter HW offload failed - classifier without re-offloading support"); | |
1199 | goto err_playback_remove; | |
1200 | } | |
1201 | } | |
1202 | } | |
1203 | ||
1204 | return 0; | |
1205 | ||
1206 | err_playback_remove: | |
1207 | tcf_block_playback_offloads(block, cb, cb_priv, false, offload_in_use, | |
1208 | extack); | |
1209 | return err; | |
1210 | } | |
1211 | ||
acb67442 JP |
1212 | struct tcf_block_cb *__tcf_block_cb_register(struct tcf_block *block, |
1213 | tc_setup_cb_t *cb, void *cb_ident, | |
60513bd8 JH |
1214 | void *cb_priv, |
1215 | struct netlink_ext_ack *extack) | |
acb67442 JP |
1216 | { |
1217 | struct tcf_block_cb *block_cb; | |
32636742 | 1218 | int err; |
acb67442 | 1219 | |
32636742 JH |
1220 | /* Replay any already present rules */ |
1221 | err = tcf_block_playback_offloads(block, cb, cb_priv, true, | |
1222 | tcf_block_offload_in_use(block), | |
1223 | extack); | |
1224 | if (err) | |
1225 | return ERR_PTR(err); | |
caa72601 | 1226 | |
acb67442 JP |
1227 | block_cb = kzalloc(sizeof(*block_cb), GFP_KERNEL); |
1228 | if (!block_cb) | |
caa72601 | 1229 | return ERR_PTR(-ENOMEM); |
acb67442 JP |
1230 | block_cb->cb = cb; |
1231 | block_cb->cb_ident = cb_ident; | |
1232 | block_cb->cb_priv = cb_priv; | |
1233 | list_add(&block_cb->list, &block->cb_list); | |
1234 | return block_cb; | |
1235 | } | |
1236 | EXPORT_SYMBOL(__tcf_block_cb_register); | |
1237 | ||
1238 | int tcf_block_cb_register(struct tcf_block *block, | |
1239 | tc_setup_cb_t *cb, void *cb_ident, | |
60513bd8 | 1240 | void *cb_priv, struct netlink_ext_ack *extack) |
acb67442 JP |
1241 | { |
1242 | struct tcf_block_cb *block_cb; | |
1243 | ||
60513bd8 JH |
1244 | block_cb = __tcf_block_cb_register(block, cb, cb_ident, cb_priv, |
1245 | extack); | |
baa2d2b1 | 1246 | return PTR_ERR_OR_ZERO(block_cb); |
acb67442 JP |
1247 | } |
1248 | EXPORT_SYMBOL(tcf_block_cb_register); | |
1249 | ||
32636742 JH |
1250 | void __tcf_block_cb_unregister(struct tcf_block *block, |
1251 | struct tcf_block_cb *block_cb) | |
acb67442 | 1252 | { |
32636742 JH |
1253 | tcf_block_playback_offloads(block, block_cb->cb, block_cb->cb_priv, |
1254 | false, tcf_block_offload_in_use(block), | |
1255 | NULL); | |
acb67442 JP |
1256 | list_del(&block_cb->list); |
1257 | kfree(block_cb); | |
1258 | } | |
1259 | EXPORT_SYMBOL(__tcf_block_cb_unregister); | |
1260 | ||
1261 | void tcf_block_cb_unregister(struct tcf_block *block, | |
1262 | tc_setup_cb_t *cb, void *cb_ident) | |
1263 | { | |
1264 | struct tcf_block_cb *block_cb; | |
1265 | ||
1266 | block_cb = tcf_block_cb_lookup(block, cb, cb_ident); | |
1267 | if (!block_cb) | |
1268 | return; | |
32636742 | 1269 | __tcf_block_cb_unregister(block, block_cb); |
acb67442 JP |
1270 | } |
1271 | EXPORT_SYMBOL(tcf_block_cb_unregister); | |
1272 | ||
87d83093 JP |
1273 | /* Main classifier routine: scans classifier chain attached |
1274 | * to this qdisc, (optionally) tests for protocol and asks | |
1275 | * specific classifiers. | |
1276 | */ | |
1277 | int tcf_classify(struct sk_buff *skb, const struct tcf_proto *tp, | |
1278 | struct tcf_result *res, bool compat_mode) | |
1279 | { | |
87d83093 JP |
1280 | #ifdef CONFIG_NET_CLS_ACT |
1281 | const int max_reclassify_loop = 4; | |
ee538dce JP |
1282 | const struct tcf_proto *orig_tp = tp; |
1283 | const struct tcf_proto *first_tp; | |
87d83093 JP |
1284 | int limit = 0; |
1285 | ||
1286 | reclassify: | |
1287 | #endif | |
1288 | for (; tp; tp = rcu_dereference_bh(tp->next)) { | |
cd0c4e70 | 1289 | __be16 protocol = tc_skb_protocol(skb); |
87d83093 JP |
1290 | int err; |
1291 | ||
1292 | if (tp->protocol != protocol && | |
1293 | tp->protocol != htons(ETH_P_ALL)) | |
1294 | continue; | |
1295 | ||
1296 | err = tp->classify(skb, tp, res); | |
1297 | #ifdef CONFIG_NET_CLS_ACT | |
db50514f | 1298 | if (unlikely(err == TC_ACT_RECLASSIFY && !compat_mode)) { |
ee538dce | 1299 | first_tp = orig_tp; |
87d83093 | 1300 | goto reset; |
db50514f | 1301 | } else if (unlikely(TC_ACT_EXT_CMP(err, TC_ACT_GOTO_CHAIN))) { |
ee538dce | 1302 | first_tp = res->goto_tp; |
db50514f JP |
1303 | goto reset; |
1304 | } | |
87d83093 JP |
1305 | #endif |
1306 | if (err >= 0) | |
1307 | return err; | |
1308 | } | |
1309 | ||
1310 | return TC_ACT_UNSPEC; /* signal: continue lookup */ | |
1311 | #ifdef CONFIG_NET_CLS_ACT | |
1312 | reset: | |
1313 | if (unlikely(limit++ >= max_reclassify_loop)) { | |
9d3aaff3 JP |
1314 | net_notice_ratelimited("%u: reclassify loop, rule prio %u, protocol %02x\n", |
1315 | tp->chain->block->index, | |
1316 | tp->prio & 0xffff, | |
87d83093 JP |
1317 | ntohs(tp->protocol)); |
1318 | return TC_ACT_SHOT; | |
1319 | } | |
1320 | ||
ee538dce | 1321 | tp = first_tp; |
87d83093 JP |
1322 | goto reclassify; |
1323 | #endif | |
1324 | } | |
1325 | EXPORT_SYMBOL(tcf_classify); | |
1326 | ||
2190d1d0 JP |
1327 | struct tcf_chain_info { |
1328 | struct tcf_proto __rcu **pprev; | |
1329 | struct tcf_proto __rcu *next; | |
1330 | }; | |
1331 | ||
1332 | static struct tcf_proto *tcf_chain_tp_prev(struct tcf_chain_info *chain_info) | |
1333 | { | |
1334 | return rtnl_dereference(*chain_info->pprev); | |
1335 | } | |
1336 | ||
1337 | static void tcf_chain_tp_insert(struct tcf_chain *chain, | |
1338 | struct tcf_chain_info *chain_info, | |
1339 | struct tcf_proto *tp) | |
1340 | { | |
c7eb7d72 | 1341 | if (*chain_info->pprev == chain->filter_chain) |
f71e0ca4 | 1342 | tcf_chain0_head_change(chain, tp); |
2190d1d0 JP |
1343 | RCU_INIT_POINTER(tp->next, tcf_chain_tp_prev(chain_info)); |
1344 | rcu_assign_pointer(*chain_info->pprev, tp); | |
e2ef7544 | 1345 | tcf_chain_hold(chain); |
2190d1d0 JP |
1346 | } |
1347 | ||
1348 | static void tcf_chain_tp_remove(struct tcf_chain *chain, | |
1349 | struct tcf_chain_info *chain_info, | |
1350 | struct tcf_proto *tp) | |
1351 | { | |
1352 | struct tcf_proto *next = rtnl_dereference(chain_info->next); | |
1353 | ||
c7eb7d72 | 1354 | if (tp == chain->filter_chain) |
f71e0ca4 | 1355 | tcf_chain0_head_change(chain, next); |
2190d1d0 | 1356 | RCU_INIT_POINTER(*chain_info->pprev, next); |
e2ef7544 | 1357 | tcf_chain_put(chain); |
2190d1d0 JP |
1358 | } |
1359 | ||
1360 | static struct tcf_proto *tcf_chain_tp_find(struct tcf_chain *chain, | |
1361 | struct tcf_chain_info *chain_info, | |
1362 | u32 protocol, u32 prio, | |
1363 | bool prio_allocate) | |
1364 | { | |
1365 | struct tcf_proto **pprev; | |
1366 | struct tcf_proto *tp; | |
1367 | ||
1368 | /* Check the chain for existence of proto-tcf with this priority */ | |
1369 | for (pprev = &chain->filter_chain; | |
1370 | (tp = rtnl_dereference(*pprev)); pprev = &tp->next) { | |
1371 | if (tp->prio >= prio) { | |
1372 | if (tp->prio == prio) { | |
1373 | if (prio_allocate || | |
1374 | (tp->protocol != protocol && protocol)) | |
1375 | return ERR_PTR(-EINVAL); | |
1376 | } else { | |
1377 | tp = NULL; | |
1378 | } | |
1379 | break; | |
1380 | } | |
1381 | } | |
1382 | chain_info->pprev = pprev; | |
1383 | chain_info->next = tp ? tp->next : NULL; | |
1384 | return tp; | |
1385 | } | |
1386 | ||
7120371c | 1387 | static int tcf_fill_node(struct net *net, struct sk_buff *skb, |
7960d1da JP |
1388 | struct tcf_proto *tp, struct tcf_block *block, |
1389 | struct Qdisc *q, u32 parent, void *fh, | |
1390 | u32 portid, u32 seq, u16 flags, int event) | |
7120371c WC |
1391 | { |
1392 | struct tcmsg *tcm; | |
1393 | struct nlmsghdr *nlh; | |
1394 | unsigned char *b = skb_tail_pointer(skb); | |
1395 | ||
1396 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags); | |
1397 | if (!nlh) | |
1398 | goto out_nlmsg_trim; | |
1399 | tcm = nlmsg_data(nlh); | |
1400 | tcm->tcm_family = AF_UNSPEC; | |
1401 | tcm->tcm__pad1 = 0; | |
1402 | tcm->tcm__pad2 = 0; | |
7960d1da JP |
1403 | if (q) { |
1404 | tcm->tcm_ifindex = qdisc_dev(q)->ifindex; | |
1405 | tcm->tcm_parent = parent; | |
1406 | } else { | |
1407 | tcm->tcm_ifindex = TCM_IFINDEX_MAGIC_BLOCK; | |
1408 | tcm->tcm_block_index = block->index; | |
1409 | } | |
7120371c WC |
1410 | tcm->tcm_info = TC_H_MAKE(tp->prio, tp->protocol); |
1411 | if (nla_put_string(skb, TCA_KIND, tp->ops->kind)) | |
1412 | goto nla_put_failure; | |
1413 | if (nla_put_u32(skb, TCA_CHAIN, tp->chain->index)) | |
1414 | goto nla_put_failure; | |
1415 | if (!fh) { | |
1416 | tcm->tcm_handle = 0; | |
1417 | } else { | |
1418 | if (tp->ops->dump && tp->ops->dump(net, tp, fh, skb, tcm) < 0) | |
1419 | goto nla_put_failure; | |
1420 | } | |
1421 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; | |
1422 | return skb->len; | |
1423 | ||
1424 | out_nlmsg_trim: | |
1425 | nla_put_failure: | |
1426 | nlmsg_trim(skb, b); | |
1427 | return -1; | |
1428 | } | |
1429 | ||
1430 | static int tfilter_notify(struct net *net, struct sk_buff *oskb, | |
1431 | struct nlmsghdr *n, struct tcf_proto *tp, | |
7960d1da JP |
1432 | struct tcf_block *block, struct Qdisc *q, |
1433 | u32 parent, void *fh, int event, bool unicast) | |
7120371c WC |
1434 | { |
1435 | struct sk_buff *skb; | |
1436 | u32 portid = oskb ? NETLINK_CB(oskb).portid : 0; | |
1437 | ||
1438 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
1439 | if (!skb) | |
1440 | return -ENOBUFS; | |
1441 | ||
7960d1da JP |
1442 | if (tcf_fill_node(net, skb, tp, block, q, parent, fh, portid, |
1443 | n->nlmsg_seq, n->nlmsg_flags, event) <= 0) { | |
7120371c WC |
1444 | kfree_skb(skb); |
1445 | return -EINVAL; | |
1446 | } | |
1447 | ||
1448 | if (unicast) | |
1449 | return netlink_unicast(net->rtnl, skb, portid, MSG_DONTWAIT); | |
1450 | ||
1451 | return rtnetlink_send(skb, net, portid, RTNLGRP_TC, | |
1452 | n->nlmsg_flags & NLM_F_ECHO); | |
1453 | } | |
1454 | ||
1455 | static int tfilter_del_notify(struct net *net, struct sk_buff *oskb, | |
1456 | struct nlmsghdr *n, struct tcf_proto *tp, | |
7960d1da | 1457 | struct tcf_block *block, struct Qdisc *q, |
c35a4acc AA |
1458 | u32 parent, void *fh, bool unicast, bool *last, |
1459 | struct netlink_ext_ack *extack) | |
7120371c WC |
1460 | { |
1461 | struct sk_buff *skb; | |
1462 | u32 portid = oskb ? NETLINK_CB(oskb).portid : 0; | |
1463 | int err; | |
1464 | ||
1465 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
1466 | if (!skb) | |
1467 | return -ENOBUFS; | |
1468 | ||
7960d1da JP |
1469 | if (tcf_fill_node(net, skb, tp, block, q, parent, fh, portid, |
1470 | n->nlmsg_seq, n->nlmsg_flags, RTM_DELTFILTER) <= 0) { | |
c35a4acc | 1471 | NL_SET_ERR_MSG(extack, "Failed to build del event notification"); |
7120371c WC |
1472 | kfree_skb(skb); |
1473 | return -EINVAL; | |
1474 | } | |
1475 | ||
571acf21 | 1476 | err = tp->ops->delete(tp, fh, last, extack); |
7120371c WC |
1477 | if (err) { |
1478 | kfree_skb(skb); | |
1479 | return err; | |
1480 | } | |
1481 | ||
1482 | if (unicast) | |
1483 | return netlink_unicast(net->rtnl, skb, portid, MSG_DONTWAIT); | |
1484 | ||
c35a4acc AA |
1485 | err = rtnetlink_send(skb, net, portid, RTNLGRP_TC, |
1486 | n->nlmsg_flags & NLM_F_ECHO); | |
1487 | if (err < 0) | |
1488 | NL_SET_ERR_MSG(extack, "Failed to send filter delete notification"); | |
1489 | return err; | |
7120371c WC |
1490 | } |
1491 | ||
1492 | static void tfilter_notify_chain(struct net *net, struct sk_buff *oskb, | |
7960d1da JP |
1493 | struct tcf_block *block, struct Qdisc *q, |
1494 | u32 parent, struct nlmsghdr *n, | |
7120371c WC |
1495 | struct tcf_chain *chain, int event) |
1496 | { | |
1497 | struct tcf_proto *tp; | |
1498 | ||
1499 | for (tp = rtnl_dereference(chain->filter_chain); | |
1500 | tp; tp = rtnl_dereference(tp->next)) | |
7960d1da | 1501 | tfilter_notify(net, oskb, n, tp, block, |
53189183 | 1502 | q, parent, NULL, event, false); |
7120371c WC |
1503 | } |
1504 | ||
c431f89b | 1505 | static int tc_new_tfilter(struct sk_buff *skb, struct nlmsghdr *n, |
c21ef3e3 | 1506 | struct netlink_ext_ack *extack) |
1da177e4 | 1507 | { |
3b1e0a65 | 1508 | struct net *net = sock_net(skb->sk); |
add93b61 | 1509 | struct nlattr *tca[TCA_MAX + 1]; |
1da177e4 LT |
1510 | struct tcmsg *t; |
1511 | u32 protocol; | |
1512 | u32 prio; | |
9d36d9e5 | 1513 | bool prio_allocate; |
1da177e4 | 1514 | u32 parent; |
5bc17018 | 1515 | u32 chain_index; |
7960d1da | 1516 | struct Qdisc *q = NULL; |
2190d1d0 | 1517 | struct tcf_chain_info chain_info; |
5bc17018 | 1518 | struct tcf_chain *chain = NULL; |
6529eaba | 1519 | struct tcf_block *block; |
1da177e4 | 1520 | struct tcf_proto *tp; |
1da177e4 | 1521 | unsigned long cl; |
8113c095 | 1522 | void *fh; |
1da177e4 | 1523 | int err; |
628185cf | 1524 | int tp_created; |
1da177e4 | 1525 | |
c431f89b | 1526 | if (!netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)) |
dfc47ef8 | 1527 | return -EPERM; |
de179c8c | 1528 | |
1da177e4 | 1529 | replay: |
628185cf DB |
1530 | tp_created = 0; |
1531 | ||
e331473f | 1532 | err = nlmsg_parse(n, sizeof(*t), tca, TCA_MAX, rtm_tca_policy, extack); |
de179c8c H |
1533 | if (err < 0) |
1534 | return err; | |
1535 | ||
942b8165 | 1536 | t = nlmsg_data(n); |
1da177e4 LT |
1537 | protocol = TC_H_MIN(t->tcm_info); |
1538 | prio = TC_H_MAJ(t->tcm_info); | |
9d36d9e5 | 1539 | prio_allocate = false; |
1da177e4 LT |
1540 | parent = t->tcm_parent; |
1541 | cl = 0; | |
1542 | ||
1543 | if (prio == 0) { | |
c431f89b VB |
1544 | /* If no priority is provided by the user, |
1545 | * we allocate one. | |
1546 | */ | |
1547 | if (n->nlmsg_flags & NLM_F_CREATE) { | |
1548 | prio = TC_H_MAKE(0x80000000U, 0U); | |
1549 | prio_allocate = true; | |
1550 | } else { | |
c35a4acc | 1551 | NL_SET_ERR_MSG(extack, "Invalid filter command with priority of zero"); |
1da177e4 | 1552 | return -ENOENT; |
ea7f8277 | 1553 | } |
1da177e4 LT |
1554 | } |
1555 | ||
1556 | /* Find head of filter chain. */ | |
1557 | ||
c431f89b VB |
1558 | block = tcf_block_find(net, &q, &parent, &cl, |
1559 | t->tcm_ifindex, t->tcm_block_index, extack); | |
1560 | if (IS_ERR(block)) { | |
1561 | err = PTR_ERR(block); | |
1562 | goto errout; | |
6bb16e7a | 1563 | } |
5bc17018 JP |
1564 | |
1565 | chain_index = tca[TCA_CHAIN] ? nla_get_u32(tca[TCA_CHAIN]) : 0; | |
1566 | if (chain_index > TC_ACT_EXT_VAL_MASK) { | |
c35a4acc | 1567 | NL_SET_ERR_MSG(extack, "Specified chain index exceeds upper limit"); |
5bc17018 JP |
1568 | err = -EINVAL; |
1569 | goto errout; | |
1570 | } | |
c431f89b | 1571 | chain = tcf_chain_get(block, chain_index, true); |
5bc17018 | 1572 | if (!chain) { |
d5ed72a5 | 1573 | NL_SET_ERR_MSG(extack, "Cannot create specified filter chain"); |
c431f89b | 1574 | err = -ENOMEM; |
ea7f8277 DB |
1575 | goto errout; |
1576 | } | |
1da177e4 | 1577 | |
2190d1d0 JP |
1578 | tp = tcf_chain_tp_find(chain, &chain_info, protocol, |
1579 | prio, prio_allocate); | |
1580 | if (IS_ERR(tp)) { | |
c35a4acc | 1581 | NL_SET_ERR_MSG(extack, "Filter with specified priority/protocol not found"); |
2190d1d0 JP |
1582 | err = PTR_ERR(tp); |
1583 | goto errout; | |
1da177e4 LT |
1584 | } |
1585 | ||
1586 | if (tp == NULL) { | |
1587 | /* Proto-tcf does not exist, create new one */ | |
1588 | ||
6bb16e7a | 1589 | if (tca[TCA_KIND] == NULL || !protocol) { |
c35a4acc | 1590 | NL_SET_ERR_MSG(extack, "Filter kind and protocol must be specified"); |
6bb16e7a | 1591 | err = -EINVAL; |
1da177e4 | 1592 | goto errout; |
6bb16e7a | 1593 | } |
1da177e4 | 1594 | |
c431f89b | 1595 | if (!(n->nlmsg_flags & NLM_F_CREATE)) { |
c35a4acc | 1596 | NL_SET_ERR_MSG(extack, "Need both RTM_NEWTFILTER and NLM_F_CREATE to create a new filter"); |
6bb16e7a | 1597 | err = -ENOENT; |
1da177e4 | 1598 | goto errout; |
6bb16e7a | 1599 | } |
1da177e4 | 1600 | |
9d36d9e5 | 1601 | if (prio_allocate) |
2190d1d0 | 1602 | prio = tcf_auto_prio(tcf_chain_tp_prev(&chain_info)); |
1da177e4 | 1603 | |
33a48927 | 1604 | tp = tcf_proto_create(nla_data(tca[TCA_KIND]), |
c35a4acc | 1605 | protocol, prio, chain, extack); |
33a48927 JP |
1606 | if (IS_ERR(tp)) { |
1607 | err = PTR_ERR(tp); | |
1da177e4 LT |
1608 | goto errout; |
1609 | } | |
12186be7 | 1610 | tp_created = 1; |
6bb16e7a | 1611 | } else if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], tp->ops->kind)) { |
c35a4acc | 1612 | NL_SET_ERR_MSG(extack, "Specified filter kind does not match existing one"); |
6bb16e7a | 1613 | err = -EINVAL; |
1da177e4 | 1614 | goto errout; |
6bb16e7a | 1615 | } |
1da177e4 LT |
1616 | |
1617 | fh = tp->ops->get(tp, t->tcm_handle); | |
1618 | ||
8113c095 | 1619 | if (!fh) { |
c431f89b | 1620 | if (!(n->nlmsg_flags & NLM_F_CREATE)) { |
c35a4acc | 1621 | NL_SET_ERR_MSG(extack, "Need both RTM_NEWTFILTER and NLM_F_CREATE to create a new filter"); |
6bb16e7a | 1622 | err = -ENOENT; |
1da177e4 | 1623 | goto errout; |
6bb16e7a | 1624 | } |
c431f89b VB |
1625 | } else if (n->nlmsg_flags & NLM_F_EXCL) { |
1626 | NL_SET_ERR_MSG(extack, "Filter already exists"); | |
1627 | err = -EEXIST; | |
1628 | goto errout; | |
1da177e4 LT |
1629 | } |
1630 | ||
9f407f17 JP |
1631 | if (chain->tmplt_ops && chain->tmplt_ops != tp->ops) { |
1632 | NL_SET_ERR_MSG(extack, "Chain template is set to a different filter kind"); | |
1633 | err = -EINVAL; | |
1634 | goto errout; | |
1635 | } | |
1636 | ||
2f7ef2f8 | 1637 | err = tp->ops->change(net, skb, tp, cl, t->tcm_handle, tca, &fh, |
7306db38 AA |
1638 | n->nlmsg_flags & NLM_F_CREATE ? TCA_ACT_NOREPLACE : TCA_ACT_REPLACE, |
1639 | extack); | |
12186be7 | 1640 | if (err == 0) { |
2190d1d0 JP |
1641 | if (tp_created) |
1642 | tcf_chain_tp_insert(chain, &chain_info, tp); | |
7960d1da | 1643 | tfilter_notify(net, skb, n, tp, block, q, parent, fh, |
a10fa201 | 1644 | RTM_NEWTFILTER, false); |
12186be7 MU |
1645 | } else { |
1646 | if (tp_created) | |
715df5ec | 1647 | tcf_proto_destroy(tp, NULL); |
12186be7 | 1648 | } |
1da177e4 LT |
1649 | |
1650 | errout: | |
5bc17018 JP |
1651 | if (chain) |
1652 | tcf_chain_put(chain); | |
e368fdb6 | 1653 | tcf_block_release(q, block); |
1da177e4 LT |
1654 | if (err == -EAGAIN) |
1655 | /* Replay the request. */ | |
1656 | goto replay; | |
1657 | return err; | |
1658 | } | |
1659 | ||
c431f89b VB |
1660 | static int tc_del_tfilter(struct sk_buff *skb, struct nlmsghdr *n, |
1661 | struct netlink_ext_ack *extack) | |
1662 | { | |
1663 | struct net *net = sock_net(skb->sk); | |
1664 | struct nlattr *tca[TCA_MAX + 1]; | |
1665 | struct tcmsg *t; | |
1666 | u32 protocol; | |
1667 | u32 prio; | |
1668 | u32 parent; | |
1669 | u32 chain_index; | |
1670 | struct Qdisc *q = NULL; | |
1671 | struct tcf_chain_info chain_info; | |
1672 | struct tcf_chain *chain = NULL; | |
1673 | struct tcf_block *block; | |
1674 | struct tcf_proto *tp = NULL; | |
1675 | unsigned long cl = 0; | |
1676 | void *fh = NULL; | |
1677 | int err; | |
1678 | ||
1679 | if (!netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)) | |
1680 | return -EPERM; | |
1681 | ||
e331473f | 1682 | err = nlmsg_parse(n, sizeof(*t), tca, TCA_MAX, rtm_tca_policy, extack); |
c431f89b VB |
1683 | if (err < 0) |
1684 | return err; | |
1685 | ||
1686 | t = nlmsg_data(n); | |
1687 | protocol = TC_H_MIN(t->tcm_info); | |
1688 | prio = TC_H_MAJ(t->tcm_info); | |
1689 | parent = t->tcm_parent; | |
1690 | ||
1691 | if (prio == 0 && (protocol || t->tcm_handle || tca[TCA_KIND])) { | |
1692 | NL_SET_ERR_MSG(extack, "Cannot flush filters with protocol, handle or kind set"); | |
1693 | return -ENOENT; | |
1694 | } | |
1695 | ||
1696 | /* Find head of filter chain. */ | |
1697 | ||
1698 | block = tcf_block_find(net, &q, &parent, &cl, | |
1699 | t->tcm_ifindex, t->tcm_block_index, extack); | |
1700 | if (IS_ERR(block)) { | |
1701 | err = PTR_ERR(block); | |
1702 | goto errout; | |
1703 | } | |
1704 | ||
1705 | chain_index = tca[TCA_CHAIN] ? nla_get_u32(tca[TCA_CHAIN]) : 0; | |
1706 | if (chain_index > TC_ACT_EXT_VAL_MASK) { | |
1707 | NL_SET_ERR_MSG(extack, "Specified chain index exceeds upper limit"); | |
1708 | err = -EINVAL; | |
1709 | goto errout; | |
1710 | } | |
1711 | chain = tcf_chain_get(block, chain_index, false); | |
1712 | if (!chain) { | |
5ca8a25c JP |
1713 | /* User requested flush on non-existent chain. Nothing to do, |
1714 | * so just return success. | |
1715 | */ | |
1716 | if (prio == 0) { | |
1717 | err = 0; | |
1718 | goto errout; | |
1719 | } | |
c431f89b | 1720 | NL_SET_ERR_MSG(extack, "Cannot find specified filter chain"); |
b7b4247d | 1721 | err = -ENOENT; |
c431f89b VB |
1722 | goto errout; |
1723 | } | |
1724 | ||
1725 | if (prio == 0) { | |
1726 | tfilter_notify_chain(net, skb, block, q, parent, n, | |
1727 | chain, RTM_DELTFILTER); | |
1728 | tcf_chain_flush(chain); | |
1729 | err = 0; | |
1730 | goto errout; | |
1731 | } | |
1732 | ||
1733 | tp = tcf_chain_tp_find(chain, &chain_info, protocol, | |
1734 | prio, false); | |
1735 | if (!tp || IS_ERR(tp)) { | |
1736 | NL_SET_ERR_MSG(extack, "Filter with specified priority/protocol not found"); | |
0e399035 | 1737 | err = tp ? PTR_ERR(tp) : -ENOENT; |
c431f89b VB |
1738 | goto errout; |
1739 | } else if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], tp->ops->kind)) { | |
1740 | NL_SET_ERR_MSG(extack, "Specified filter kind does not match existing one"); | |
1741 | err = -EINVAL; | |
1742 | goto errout; | |
1743 | } | |
1744 | ||
1745 | fh = tp->ops->get(tp, t->tcm_handle); | |
1746 | ||
1747 | if (!fh) { | |
1748 | if (t->tcm_handle == 0) { | |
1749 | tcf_chain_tp_remove(chain, &chain_info, tp); | |
1750 | tfilter_notify(net, skb, n, tp, block, q, parent, fh, | |
1751 | RTM_DELTFILTER, false); | |
1752 | tcf_proto_destroy(tp, extack); | |
1753 | err = 0; | |
1754 | } else { | |
1755 | NL_SET_ERR_MSG(extack, "Specified filter handle not found"); | |
1756 | err = -ENOENT; | |
1757 | } | |
1758 | } else { | |
1759 | bool last; | |
1760 | ||
1761 | err = tfilter_del_notify(net, skb, n, tp, block, | |
1762 | q, parent, fh, false, &last, | |
1763 | extack); | |
1764 | if (err) | |
1765 | goto errout; | |
1766 | if (last) { | |
1767 | tcf_chain_tp_remove(chain, &chain_info, tp); | |
1768 | tcf_proto_destroy(tp, extack); | |
1769 | } | |
1770 | } | |
1771 | ||
1772 | errout: | |
1773 | if (chain) | |
1774 | tcf_chain_put(chain); | |
e368fdb6 | 1775 | tcf_block_release(q, block); |
c431f89b VB |
1776 | return err; |
1777 | } | |
1778 | ||
1779 | static int tc_get_tfilter(struct sk_buff *skb, struct nlmsghdr *n, | |
1780 | struct netlink_ext_ack *extack) | |
1781 | { | |
1782 | struct net *net = sock_net(skb->sk); | |
1783 | struct nlattr *tca[TCA_MAX + 1]; | |
1784 | struct tcmsg *t; | |
1785 | u32 protocol; | |
1786 | u32 prio; | |
1787 | u32 parent; | |
1788 | u32 chain_index; | |
1789 | struct Qdisc *q = NULL; | |
1790 | struct tcf_chain_info chain_info; | |
1791 | struct tcf_chain *chain = NULL; | |
1792 | struct tcf_block *block; | |
1793 | struct tcf_proto *tp = NULL; | |
1794 | unsigned long cl = 0; | |
1795 | void *fh = NULL; | |
1796 | int err; | |
1797 | ||
e331473f | 1798 | err = nlmsg_parse(n, sizeof(*t), tca, TCA_MAX, rtm_tca_policy, extack); |
c431f89b VB |
1799 | if (err < 0) |
1800 | return err; | |
1801 | ||
1802 | t = nlmsg_data(n); | |
1803 | protocol = TC_H_MIN(t->tcm_info); | |
1804 | prio = TC_H_MAJ(t->tcm_info); | |
1805 | parent = t->tcm_parent; | |
1806 | ||
1807 | if (prio == 0) { | |
1808 | NL_SET_ERR_MSG(extack, "Invalid filter command with priority of zero"); | |
1809 | return -ENOENT; | |
1810 | } | |
1811 | ||
1812 | /* Find head of filter chain. */ | |
1813 | ||
1814 | block = tcf_block_find(net, &q, &parent, &cl, | |
1815 | t->tcm_ifindex, t->tcm_block_index, extack); | |
1816 | if (IS_ERR(block)) { | |
1817 | err = PTR_ERR(block); | |
1818 | goto errout; | |
1819 | } | |
1820 | ||
1821 | chain_index = tca[TCA_CHAIN] ? nla_get_u32(tca[TCA_CHAIN]) : 0; | |
1822 | if (chain_index > TC_ACT_EXT_VAL_MASK) { | |
1823 | NL_SET_ERR_MSG(extack, "Specified chain index exceeds upper limit"); | |
1824 | err = -EINVAL; | |
1825 | goto errout; | |
1826 | } | |
1827 | chain = tcf_chain_get(block, chain_index, false); | |
1828 | if (!chain) { | |
1829 | NL_SET_ERR_MSG(extack, "Cannot find specified filter chain"); | |
1830 | err = -EINVAL; | |
1831 | goto errout; | |
1832 | } | |
1833 | ||
1834 | tp = tcf_chain_tp_find(chain, &chain_info, protocol, | |
1835 | prio, false); | |
1836 | if (!tp || IS_ERR(tp)) { | |
1837 | NL_SET_ERR_MSG(extack, "Filter with specified priority/protocol not found"); | |
0e399035 | 1838 | err = tp ? PTR_ERR(tp) : -ENOENT; |
c431f89b VB |
1839 | goto errout; |
1840 | } else if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], tp->ops->kind)) { | |
1841 | NL_SET_ERR_MSG(extack, "Specified filter kind does not match existing one"); | |
1842 | err = -EINVAL; | |
1843 | goto errout; | |
1844 | } | |
1845 | ||
1846 | fh = tp->ops->get(tp, t->tcm_handle); | |
1847 | ||
1848 | if (!fh) { | |
1849 | NL_SET_ERR_MSG(extack, "Specified filter handle not found"); | |
1850 | err = -ENOENT; | |
1851 | } else { | |
1852 | err = tfilter_notify(net, skb, n, tp, block, q, parent, | |
1853 | fh, RTM_NEWTFILTER, true); | |
1854 | if (err < 0) | |
1855 | NL_SET_ERR_MSG(extack, "Failed to send filter notify message"); | |
1856 | } | |
1857 | ||
1858 | errout: | |
1859 | if (chain) | |
1860 | tcf_chain_put(chain); | |
e368fdb6 | 1861 | tcf_block_release(q, block); |
c431f89b VB |
1862 | return err; |
1863 | } | |
1864 | ||
aa767bfe | 1865 | struct tcf_dump_args { |
1da177e4 LT |
1866 | struct tcf_walker w; |
1867 | struct sk_buff *skb; | |
1868 | struct netlink_callback *cb; | |
7960d1da | 1869 | struct tcf_block *block; |
a10fa201 JP |
1870 | struct Qdisc *q; |
1871 | u32 parent; | |
1da177e4 LT |
1872 | }; |
1873 | ||
8113c095 | 1874 | static int tcf_node_dump(struct tcf_proto *tp, void *n, struct tcf_walker *arg) |
1da177e4 | 1875 | { |
aa767bfe | 1876 | struct tcf_dump_args *a = (void *)arg; |
832d1d5b | 1877 | struct net *net = sock_net(a->skb->sk); |
1da177e4 | 1878 | |
7960d1da | 1879 | return tcf_fill_node(net, a->skb, tp, a->block, a->q, a->parent, |
a10fa201 | 1880 | n, NETLINK_CB(a->cb->skb).portid, |
5a7a5555 JHS |
1881 | a->cb->nlh->nlmsg_seq, NLM_F_MULTI, |
1882 | RTM_NEWTFILTER); | |
1da177e4 LT |
1883 | } |
1884 | ||
a10fa201 JP |
1885 | static bool tcf_chain_dump(struct tcf_chain *chain, struct Qdisc *q, u32 parent, |
1886 | struct sk_buff *skb, struct netlink_callback *cb, | |
acb31fae JP |
1887 | long index_start, long *p_index) |
1888 | { | |
1889 | struct net *net = sock_net(skb->sk); | |
7960d1da | 1890 | struct tcf_block *block = chain->block; |
acb31fae JP |
1891 | struct tcmsg *tcm = nlmsg_data(cb->nlh); |
1892 | struct tcf_dump_args arg; | |
1893 | struct tcf_proto *tp; | |
1894 | ||
1895 | for (tp = rtnl_dereference(chain->filter_chain); | |
1896 | tp; tp = rtnl_dereference(tp->next), (*p_index)++) { | |
1897 | if (*p_index < index_start) | |
1898 | continue; | |
1899 | if (TC_H_MAJ(tcm->tcm_info) && | |
1900 | TC_H_MAJ(tcm->tcm_info) != tp->prio) | |
1901 | continue; | |
1902 | if (TC_H_MIN(tcm->tcm_info) && | |
1903 | TC_H_MIN(tcm->tcm_info) != tp->protocol) | |
1904 | continue; | |
1905 | if (*p_index > index_start) | |
1906 | memset(&cb->args[1], 0, | |
1907 | sizeof(cb->args) - sizeof(cb->args[0])); | |
1908 | if (cb->args[1] == 0) { | |
53189183 | 1909 | if (tcf_fill_node(net, skb, tp, block, q, parent, NULL, |
acb31fae JP |
1910 | NETLINK_CB(cb->skb).portid, |
1911 | cb->nlh->nlmsg_seq, NLM_F_MULTI, | |
1912 | RTM_NEWTFILTER) <= 0) | |
5bc17018 | 1913 | return false; |
acb31fae JP |
1914 | |
1915 | cb->args[1] = 1; | |
1916 | } | |
1917 | if (!tp->ops->walk) | |
1918 | continue; | |
1919 | arg.w.fn = tcf_node_dump; | |
1920 | arg.skb = skb; | |
1921 | arg.cb = cb; | |
7960d1da | 1922 | arg.block = block; |
a10fa201 JP |
1923 | arg.q = q; |
1924 | arg.parent = parent; | |
acb31fae JP |
1925 | arg.w.stop = 0; |
1926 | arg.w.skip = cb->args[1] - 1; | |
1927 | arg.w.count = 0; | |
01683a14 | 1928 | arg.w.cookie = cb->args[2]; |
acb31fae | 1929 | tp->ops->walk(tp, &arg.w); |
01683a14 | 1930 | cb->args[2] = arg.w.cookie; |
acb31fae JP |
1931 | cb->args[1] = arg.w.count + 1; |
1932 | if (arg.w.stop) | |
5bc17018 | 1933 | return false; |
acb31fae | 1934 | } |
5bc17018 | 1935 | return true; |
acb31fae JP |
1936 | } |
1937 | ||
bd27a875 | 1938 | /* called with RTNL */ |
1da177e4 LT |
1939 | static int tc_dump_tfilter(struct sk_buff *skb, struct netlink_callback *cb) |
1940 | { | |
3b1e0a65 | 1941 | struct net *net = sock_net(skb->sk); |
5bc17018 | 1942 | struct nlattr *tca[TCA_MAX + 1]; |
7960d1da | 1943 | struct Qdisc *q = NULL; |
6529eaba | 1944 | struct tcf_block *block; |
2190d1d0 | 1945 | struct tcf_chain *chain; |
942b8165 | 1946 | struct tcmsg *tcm = nlmsg_data(cb->nlh); |
acb31fae JP |
1947 | long index_start; |
1948 | long index; | |
a10fa201 | 1949 | u32 parent; |
5bc17018 | 1950 | int err; |
1da177e4 | 1951 | |
573ce260 | 1952 | if (nlmsg_len(cb->nlh) < sizeof(*tcm)) |
1da177e4 | 1953 | return skb->len; |
5bc17018 | 1954 | |
dac9c979 DA |
1955 | err = nlmsg_parse(cb->nlh, sizeof(*tcm), tca, TCA_MAX, NULL, |
1956 | cb->extack); | |
5bc17018 JP |
1957 | if (err) |
1958 | return err; | |
1959 | ||
7960d1da | 1960 | if (tcm->tcm_ifindex == TCM_IFINDEX_MAGIC_BLOCK) { |
787ce6d0 | 1961 | block = tcf_block_refcnt_get(net, tcm->tcm_block_index); |
7960d1da JP |
1962 | if (!block) |
1963 | goto out; | |
d680b352 JP |
1964 | /* If we work with block index, q is NULL and parent value |
1965 | * will never be used in the following code. The check | |
1966 | * in tcf_fill_node prevents it. However, compiler does not | |
1967 | * see that far, so set parent to zero to silence the warning | |
1968 | * about parent being uninitialized. | |
1969 | */ | |
1970 | parent = 0; | |
a10fa201 | 1971 | } else { |
7960d1da JP |
1972 | const struct Qdisc_class_ops *cops; |
1973 | struct net_device *dev; | |
1974 | unsigned long cl = 0; | |
1975 | ||
1976 | dev = __dev_get_by_index(net, tcm->tcm_ifindex); | |
1977 | if (!dev) | |
1978 | return skb->len; | |
1979 | ||
1980 | parent = tcm->tcm_parent; | |
1981 | if (!parent) { | |
1982 | q = dev->qdisc; | |
1983 | parent = q->handle; | |
1984 | } else { | |
1985 | q = qdisc_lookup(dev, TC_H_MAJ(tcm->tcm_parent)); | |
1986 | } | |
1987 | if (!q) | |
1988 | goto out; | |
1989 | cops = q->ops->cl_ops; | |
1990 | if (!cops) | |
143976ce | 1991 | goto out; |
7960d1da JP |
1992 | if (!cops->tcf_block) |
1993 | goto out; | |
1994 | if (TC_H_MIN(tcm->tcm_parent)) { | |
1995 | cl = cops->find(q, tcm->tcm_parent); | |
1996 | if (cl == 0) | |
1997 | goto out; | |
1998 | } | |
1999 | block = cops->tcf_block(q, cl, NULL); | |
2000 | if (!block) | |
2001 | goto out; | |
2002 | if (tcf_block_shared(block)) | |
2003 | q = NULL; | |
1da177e4 | 2004 | } |
1da177e4 | 2005 | |
acb31fae JP |
2006 | index_start = cb->args[0]; |
2007 | index = 0; | |
5bc17018 JP |
2008 | |
2009 | list_for_each_entry(chain, &block->chain_list, list) { | |
2010 | if (tca[TCA_CHAIN] && | |
2011 | nla_get_u32(tca[TCA_CHAIN]) != chain->index) | |
2012 | continue; | |
a10fa201 | 2013 | if (!tcf_chain_dump(chain, q, parent, skb, cb, |
5ae437ad RK |
2014 | index_start, &index)) { |
2015 | err = -EMSGSIZE; | |
5bc17018 | 2016 | break; |
5ae437ad | 2017 | } |
5bc17018 JP |
2018 | } |
2019 | ||
787ce6d0 VB |
2020 | if (tcm->tcm_ifindex == TCM_IFINDEX_MAGIC_BLOCK) |
2021 | tcf_block_refcnt_put(block); | |
acb31fae | 2022 | cb->args[0] = index; |
1da177e4 | 2023 | |
1da177e4 | 2024 | out: |
5ae437ad RK |
2025 | /* If we did no progress, the error (EMSGSIZE) is real */ |
2026 | if (skb->len == 0 && err) | |
2027 | return err; | |
1da177e4 LT |
2028 | return skb->len; |
2029 | } | |
2030 | ||
32a4f5ec JP |
2031 | static int tc_chain_fill_node(struct tcf_chain *chain, struct net *net, |
2032 | struct sk_buff *skb, struct tcf_block *block, | |
2033 | u32 portid, u32 seq, u16 flags, int event) | |
2034 | { | |
2035 | unsigned char *b = skb_tail_pointer(skb); | |
9f407f17 | 2036 | const struct tcf_proto_ops *ops; |
32a4f5ec JP |
2037 | struct nlmsghdr *nlh; |
2038 | struct tcmsg *tcm; | |
9f407f17 JP |
2039 | void *priv; |
2040 | ||
2041 | ops = chain->tmplt_ops; | |
2042 | priv = chain->tmplt_priv; | |
32a4f5ec JP |
2043 | |
2044 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags); | |
2045 | if (!nlh) | |
2046 | goto out_nlmsg_trim; | |
2047 | tcm = nlmsg_data(nlh); | |
2048 | tcm->tcm_family = AF_UNSPEC; | |
2049 | tcm->tcm__pad1 = 0; | |
2050 | tcm->tcm__pad2 = 0; | |
2051 | tcm->tcm_handle = 0; | |
2052 | if (block->q) { | |
2053 | tcm->tcm_ifindex = qdisc_dev(block->q)->ifindex; | |
2054 | tcm->tcm_parent = block->q->handle; | |
2055 | } else { | |
2056 | tcm->tcm_ifindex = TCM_IFINDEX_MAGIC_BLOCK; | |
2057 | tcm->tcm_block_index = block->index; | |
2058 | } | |
2059 | ||
2060 | if (nla_put_u32(skb, TCA_CHAIN, chain->index)) | |
2061 | goto nla_put_failure; | |
2062 | ||
9f407f17 JP |
2063 | if (ops) { |
2064 | if (nla_put_string(skb, TCA_KIND, ops->kind)) | |
2065 | goto nla_put_failure; | |
2066 | if (ops->tmplt_dump(skb, net, priv) < 0) | |
2067 | goto nla_put_failure; | |
2068 | } | |
2069 | ||
32a4f5ec JP |
2070 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
2071 | return skb->len; | |
2072 | ||
2073 | out_nlmsg_trim: | |
2074 | nla_put_failure: | |
2075 | nlmsg_trim(skb, b); | |
2076 | return -EMSGSIZE; | |
2077 | } | |
2078 | ||
2079 | static int tc_chain_notify(struct tcf_chain *chain, struct sk_buff *oskb, | |
2080 | u32 seq, u16 flags, int event, bool unicast) | |
2081 | { | |
2082 | u32 portid = oskb ? NETLINK_CB(oskb).portid : 0; | |
2083 | struct tcf_block *block = chain->block; | |
2084 | struct net *net = block->net; | |
2085 | struct sk_buff *skb; | |
2086 | ||
2087 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
2088 | if (!skb) | |
2089 | return -ENOBUFS; | |
2090 | ||
2091 | if (tc_chain_fill_node(chain, net, skb, block, portid, | |
2092 | seq, flags, event) <= 0) { | |
2093 | kfree_skb(skb); | |
2094 | return -EINVAL; | |
2095 | } | |
2096 | ||
2097 | if (unicast) | |
2098 | return netlink_unicast(net->rtnl, skb, portid, MSG_DONTWAIT); | |
2099 | ||
2100 | return rtnetlink_send(skb, net, portid, RTNLGRP_TC, flags & NLM_F_ECHO); | |
2101 | } | |
2102 | ||
9f407f17 JP |
2103 | static int tc_chain_tmplt_add(struct tcf_chain *chain, struct net *net, |
2104 | struct nlattr **tca, | |
2105 | struct netlink_ext_ack *extack) | |
2106 | { | |
2107 | const struct tcf_proto_ops *ops; | |
2108 | void *tmplt_priv; | |
2109 | ||
2110 | /* If kind is not set, user did not specify template. */ | |
2111 | if (!tca[TCA_KIND]) | |
2112 | return 0; | |
2113 | ||
2114 | ops = tcf_proto_lookup_ops(nla_data(tca[TCA_KIND]), extack); | |
2115 | if (IS_ERR(ops)) | |
2116 | return PTR_ERR(ops); | |
2117 | if (!ops->tmplt_create || !ops->tmplt_destroy || !ops->tmplt_dump) { | |
2118 | NL_SET_ERR_MSG(extack, "Chain templates are not supported with specified classifier"); | |
2119 | return -EOPNOTSUPP; | |
2120 | } | |
2121 | ||
2122 | tmplt_priv = ops->tmplt_create(net, chain, tca, extack); | |
2123 | if (IS_ERR(tmplt_priv)) { | |
2124 | module_put(ops->owner); | |
2125 | return PTR_ERR(tmplt_priv); | |
2126 | } | |
2127 | chain->tmplt_ops = ops; | |
2128 | chain->tmplt_priv = tmplt_priv; | |
2129 | return 0; | |
2130 | } | |
2131 | ||
2132 | static void tc_chain_tmplt_del(struct tcf_chain *chain) | |
2133 | { | |
2134 | const struct tcf_proto_ops *ops = chain->tmplt_ops; | |
2135 | ||
2136 | /* If template ops are set, no work to do for us. */ | |
2137 | if (!ops) | |
2138 | return; | |
2139 | ||
2140 | ops->tmplt_destroy(chain->tmplt_priv); | |
2141 | module_put(ops->owner); | |
2142 | } | |
2143 | ||
32a4f5ec JP |
2144 | /* Add/delete/get a chain */ |
2145 | ||
2146 | static int tc_ctl_chain(struct sk_buff *skb, struct nlmsghdr *n, | |
2147 | struct netlink_ext_ack *extack) | |
2148 | { | |
2149 | struct net *net = sock_net(skb->sk); | |
2150 | struct nlattr *tca[TCA_MAX + 1]; | |
2151 | struct tcmsg *t; | |
2152 | u32 parent; | |
2153 | u32 chain_index; | |
2154 | struct Qdisc *q = NULL; | |
2155 | struct tcf_chain *chain = NULL; | |
2156 | struct tcf_block *block; | |
2157 | unsigned long cl; | |
2158 | int err; | |
2159 | ||
2160 | if (n->nlmsg_type != RTM_GETCHAIN && | |
2161 | !netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)) | |
2162 | return -EPERM; | |
2163 | ||
2164 | replay: | |
e331473f | 2165 | err = nlmsg_parse(n, sizeof(*t), tca, TCA_MAX, rtm_tca_policy, extack); |
32a4f5ec JP |
2166 | if (err < 0) |
2167 | return err; | |
2168 | ||
2169 | t = nlmsg_data(n); | |
2170 | parent = t->tcm_parent; | |
2171 | cl = 0; | |
2172 | ||
2173 | block = tcf_block_find(net, &q, &parent, &cl, | |
2174 | t->tcm_ifindex, t->tcm_block_index, extack); | |
2175 | if (IS_ERR(block)) | |
2176 | return PTR_ERR(block); | |
2177 | ||
2178 | chain_index = tca[TCA_CHAIN] ? nla_get_u32(tca[TCA_CHAIN]) : 0; | |
2179 | if (chain_index > TC_ACT_EXT_VAL_MASK) { | |
2180 | NL_SET_ERR_MSG(extack, "Specified chain index exceeds upper limit"); | |
e368fdb6 VB |
2181 | err = -EINVAL; |
2182 | goto errout_block; | |
32a4f5ec JP |
2183 | } |
2184 | chain = tcf_chain_lookup(block, chain_index); | |
2185 | if (n->nlmsg_type == RTM_NEWCHAIN) { | |
2186 | if (chain) { | |
3d32f4c5 | 2187 | if (tcf_chain_held_by_acts_only(chain)) { |
1f3ed383 | 2188 | /* The chain exists only because there is |
3d32f4c5 | 2189 | * some action referencing it. |
1f3ed383 JP |
2190 | */ |
2191 | tcf_chain_hold(chain); | |
2192 | } else { | |
2193 | NL_SET_ERR_MSG(extack, "Filter chain already exists"); | |
e368fdb6 VB |
2194 | err = -EEXIST; |
2195 | goto errout_block; | |
1f3ed383 JP |
2196 | } |
2197 | } else { | |
2198 | if (!(n->nlmsg_flags & NLM_F_CREATE)) { | |
2199 | NL_SET_ERR_MSG(extack, "Need both RTM_NEWCHAIN and NLM_F_CREATE to create a new chain"); | |
e368fdb6 VB |
2200 | err = -ENOENT; |
2201 | goto errout_block; | |
1f3ed383 JP |
2202 | } |
2203 | chain = tcf_chain_create(block, chain_index); | |
2204 | if (!chain) { | |
2205 | NL_SET_ERR_MSG(extack, "Failed to create filter chain"); | |
e368fdb6 VB |
2206 | err = -ENOMEM; |
2207 | goto errout_block; | |
1f3ed383 | 2208 | } |
32a4f5ec JP |
2209 | } |
2210 | } else { | |
3d32f4c5 | 2211 | if (!chain || tcf_chain_held_by_acts_only(chain)) { |
32a4f5ec | 2212 | NL_SET_ERR_MSG(extack, "Cannot find specified filter chain"); |
e368fdb6 VB |
2213 | err = -EINVAL; |
2214 | goto errout_block; | |
32a4f5ec JP |
2215 | } |
2216 | tcf_chain_hold(chain); | |
2217 | } | |
2218 | ||
2219 | switch (n->nlmsg_type) { | |
2220 | case RTM_NEWCHAIN: | |
9f407f17 JP |
2221 | err = tc_chain_tmplt_add(chain, net, tca, extack); |
2222 | if (err) | |
2223 | goto errout; | |
32a4f5ec JP |
2224 | /* In case the chain was successfully added, take a reference |
2225 | * to the chain. This ensures that an empty chain | |
2226 | * does not disappear at the end of this function. | |
2227 | */ | |
2228 | tcf_chain_hold(chain); | |
2229 | chain->explicitly_created = true; | |
2230 | tc_chain_notify(chain, NULL, 0, NLM_F_CREATE | NLM_F_EXCL, | |
2231 | RTM_NEWCHAIN, false); | |
2232 | break; | |
2233 | case RTM_DELCHAIN: | |
f5b9bac7 CW |
2234 | tfilter_notify_chain(net, skb, block, q, parent, n, |
2235 | chain, RTM_DELTFILTER); | |
32a4f5ec JP |
2236 | /* Flush the chain first as the user requested chain removal. */ |
2237 | tcf_chain_flush(chain); | |
2238 | /* In case the chain was successfully deleted, put a reference | |
2239 | * to the chain previously taken during addition. | |
2240 | */ | |
2241 | tcf_chain_put_explicitly_created(chain); | |
c921d7db | 2242 | chain->explicitly_created = false; |
32a4f5ec JP |
2243 | break; |
2244 | case RTM_GETCHAIN: | |
32a4f5ec JP |
2245 | err = tc_chain_notify(chain, skb, n->nlmsg_seq, |
2246 | n->nlmsg_seq, n->nlmsg_type, true); | |
2247 | if (err < 0) | |
2248 | NL_SET_ERR_MSG(extack, "Failed to send chain notify message"); | |
2249 | break; | |
2250 | default: | |
2251 | err = -EOPNOTSUPP; | |
2252 | NL_SET_ERR_MSG(extack, "Unsupported message type"); | |
2253 | goto errout; | |
2254 | } | |
2255 | ||
2256 | errout: | |
2257 | tcf_chain_put(chain); | |
e368fdb6 VB |
2258 | errout_block: |
2259 | tcf_block_release(q, block); | |
32a4f5ec JP |
2260 | if (err == -EAGAIN) |
2261 | /* Replay the request. */ | |
2262 | goto replay; | |
2263 | return err; | |
2264 | } | |
2265 | ||
2266 | /* called with RTNL */ | |
2267 | static int tc_dump_chain(struct sk_buff *skb, struct netlink_callback *cb) | |
2268 | { | |
2269 | struct net *net = sock_net(skb->sk); | |
2270 | struct nlattr *tca[TCA_MAX + 1]; | |
2271 | struct Qdisc *q = NULL; | |
2272 | struct tcf_block *block; | |
2273 | struct tcf_chain *chain; | |
2274 | struct tcmsg *tcm = nlmsg_data(cb->nlh); | |
2275 | long index_start; | |
2276 | long index; | |
2277 | u32 parent; | |
2278 | int err; | |
2279 | ||
2280 | if (nlmsg_len(cb->nlh) < sizeof(*tcm)) | |
2281 | return skb->len; | |
2282 | ||
e331473f | 2283 | err = nlmsg_parse(cb->nlh, sizeof(*tcm), tca, TCA_MAX, rtm_tca_policy, |
dac9c979 | 2284 | cb->extack); |
32a4f5ec JP |
2285 | if (err) |
2286 | return err; | |
2287 | ||
2288 | if (tcm->tcm_ifindex == TCM_IFINDEX_MAGIC_BLOCK) { | |
787ce6d0 | 2289 | block = tcf_block_refcnt_get(net, tcm->tcm_block_index); |
32a4f5ec JP |
2290 | if (!block) |
2291 | goto out; | |
2292 | /* If we work with block index, q is NULL and parent value | |
2293 | * will never be used in the following code. The check | |
2294 | * in tcf_fill_node prevents it. However, compiler does not | |
2295 | * see that far, so set parent to zero to silence the warning | |
2296 | * about parent being uninitialized. | |
2297 | */ | |
2298 | parent = 0; | |
2299 | } else { | |
2300 | const struct Qdisc_class_ops *cops; | |
2301 | struct net_device *dev; | |
2302 | unsigned long cl = 0; | |
2303 | ||
2304 | dev = __dev_get_by_index(net, tcm->tcm_ifindex); | |
2305 | if (!dev) | |
2306 | return skb->len; | |
2307 | ||
2308 | parent = tcm->tcm_parent; | |
2309 | if (!parent) { | |
2310 | q = dev->qdisc; | |
2311 | parent = q->handle; | |
2312 | } else { | |
2313 | q = qdisc_lookup(dev, TC_H_MAJ(tcm->tcm_parent)); | |
2314 | } | |
2315 | if (!q) | |
2316 | goto out; | |
2317 | cops = q->ops->cl_ops; | |
2318 | if (!cops) | |
2319 | goto out; | |
2320 | if (!cops->tcf_block) | |
2321 | goto out; | |
2322 | if (TC_H_MIN(tcm->tcm_parent)) { | |
2323 | cl = cops->find(q, tcm->tcm_parent); | |
2324 | if (cl == 0) | |
2325 | goto out; | |
2326 | } | |
2327 | block = cops->tcf_block(q, cl, NULL); | |
2328 | if (!block) | |
2329 | goto out; | |
2330 | if (tcf_block_shared(block)) | |
2331 | q = NULL; | |
2332 | } | |
2333 | ||
2334 | index_start = cb->args[0]; | |
2335 | index = 0; | |
2336 | ||
2337 | list_for_each_entry(chain, &block->chain_list, list) { | |
2338 | if ((tca[TCA_CHAIN] && | |
2339 | nla_get_u32(tca[TCA_CHAIN]) != chain->index)) | |
2340 | continue; | |
2341 | if (index < index_start) { | |
2342 | index++; | |
2343 | continue; | |
2344 | } | |
3d32f4c5 | 2345 | if (tcf_chain_held_by_acts_only(chain)) |
1f3ed383 | 2346 | continue; |
32a4f5ec JP |
2347 | err = tc_chain_fill_node(chain, net, skb, block, |
2348 | NETLINK_CB(cb->skb).portid, | |
2349 | cb->nlh->nlmsg_seq, NLM_F_MULTI, | |
2350 | RTM_NEWCHAIN); | |
2351 | if (err <= 0) | |
2352 | break; | |
2353 | index++; | |
2354 | } | |
2355 | ||
787ce6d0 VB |
2356 | if (tcm->tcm_ifindex == TCM_IFINDEX_MAGIC_BLOCK) |
2357 | tcf_block_refcnt_put(block); | |
32a4f5ec JP |
2358 | cb->args[0] = index; |
2359 | ||
2360 | out: | |
2361 | /* If we did no progress, the error (EMSGSIZE) is real */ | |
2362 | if (skb->len == 0 && err) | |
2363 | return err; | |
2364 | return skb->len; | |
2365 | } | |
2366 | ||
18d0264f | 2367 | void tcf_exts_destroy(struct tcf_exts *exts) |
1da177e4 LT |
2368 | { |
2369 | #ifdef CONFIG_NET_CLS_ACT | |
90b73b77 | 2370 | tcf_action_destroy(exts->actions, TCA_ACT_UNBIND); |
22dc13c8 WC |
2371 | kfree(exts->actions); |
2372 | exts->nr_actions = 0; | |
1da177e4 LT |
2373 | #endif |
2374 | } | |
aa767bfe | 2375 | EXPORT_SYMBOL(tcf_exts_destroy); |
1da177e4 | 2376 | |
c1b52739 | 2377 | int tcf_exts_validate(struct net *net, struct tcf_proto *tp, struct nlattr **tb, |
50a56190 AA |
2378 | struct nlattr *rate_tlv, struct tcf_exts *exts, bool ovr, |
2379 | struct netlink_ext_ack *extack) | |
1da177e4 | 2380 | { |
1da177e4 LT |
2381 | #ifdef CONFIG_NET_CLS_ACT |
2382 | { | |
1da177e4 | 2383 | struct tc_action *act; |
d04e6990 | 2384 | size_t attr_size = 0; |
1da177e4 | 2385 | |
5da57f42 | 2386 | if (exts->police && tb[exts->police]) { |
9fb9f251 JP |
2387 | act = tcf_action_init_1(net, tp, tb[exts->police], |
2388 | rate_tlv, "police", ovr, | |
789871bb | 2389 | TCA_ACT_BIND, true, extack); |
ab27cfb8 PM |
2390 | if (IS_ERR(act)) |
2391 | return PTR_ERR(act); | |
1da177e4 | 2392 | |
33be6271 | 2393 | act->type = exts->type = TCA_OLD_COMPAT; |
22dc13c8 WC |
2394 | exts->actions[0] = act; |
2395 | exts->nr_actions = 1; | |
5da57f42 | 2396 | } else if (exts->action && tb[exts->action]) { |
90b73b77 | 2397 | int err; |
22dc13c8 | 2398 | |
9fb9f251 JP |
2399 | err = tcf_action_init(net, tp, tb[exts->action], |
2400 | rate_tlv, NULL, ovr, TCA_ACT_BIND, | |
90b73b77 | 2401 | exts->actions, &attr_size, true, |
789871bb | 2402 | extack); |
90b73b77 | 2403 | if (err < 0) |
33be6271 | 2404 | return err; |
90b73b77 | 2405 | exts->nr_actions = err; |
1da177e4 | 2406 | } |
e4b95c41 | 2407 | exts->net = net; |
1da177e4 | 2408 | } |
1da177e4 | 2409 | #else |
5da57f42 | 2410 | if ((exts->action && tb[exts->action]) || |
50a56190 AA |
2411 | (exts->police && tb[exts->police])) { |
2412 | NL_SET_ERR_MSG(extack, "Classifier actions are not supported per compile options (CONFIG_NET_CLS_ACT)"); | |
1da177e4 | 2413 | return -EOPNOTSUPP; |
50a56190 | 2414 | } |
1da177e4 LT |
2415 | #endif |
2416 | ||
2417 | return 0; | |
2418 | } | |
aa767bfe | 2419 | EXPORT_SYMBOL(tcf_exts_validate); |
1da177e4 | 2420 | |
9b0d4446 | 2421 | void tcf_exts_change(struct tcf_exts *dst, struct tcf_exts *src) |
1da177e4 LT |
2422 | { |
2423 | #ifdef CONFIG_NET_CLS_ACT | |
22dc13c8 WC |
2424 | struct tcf_exts old = *dst; |
2425 | ||
9b0d4446 | 2426 | *dst = *src; |
22dc13c8 | 2427 | tcf_exts_destroy(&old); |
1da177e4 LT |
2428 | #endif |
2429 | } | |
aa767bfe | 2430 | EXPORT_SYMBOL(tcf_exts_change); |
1da177e4 | 2431 | |
22dc13c8 WC |
2432 | #ifdef CONFIG_NET_CLS_ACT |
2433 | static struct tc_action *tcf_exts_first_act(struct tcf_exts *exts) | |
2434 | { | |
2435 | if (exts->nr_actions == 0) | |
2436 | return NULL; | |
2437 | else | |
2438 | return exts->actions[0]; | |
2439 | } | |
2440 | #endif | |
33be6271 | 2441 | |
5da57f42 | 2442 | int tcf_exts_dump(struct sk_buff *skb, struct tcf_exts *exts) |
1da177e4 LT |
2443 | { |
2444 | #ifdef CONFIG_NET_CLS_ACT | |
9cc63db5 CW |
2445 | struct nlattr *nest; |
2446 | ||
978dfd8d | 2447 | if (exts->action && tcf_exts_has_actions(exts)) { |
1da177e4 LT |
2448 | /* |
2449 | * again for backward compatible mode - we want | |
2450 | * to work with both old and new modes of entering | |
2451 | * tc data even if iproute2 was newer - jhs | |
2452 | */ | |
33be6271 | 2453 | if (exts->type != TCA_OLD_COMPAT) { |
5da57f42 | 2454 | nest = nla_nest_start(skb, exts->action); |
4b3550ef PM |
2455 | if (nest == NULL) |
2456 | goto nla_put_failure; | |
22dc13c8 | 2457 | |
90b73b77 | 2458 | if (tcf_action_dump(skb, exts->actions, 0, 0) < 0) |
add93b61 | 2459 | goto nla_put_failure; |
4b3550ef | 2460 | nla_nest_end(skb, nest); |
5da57f42 | 2461 | } else if (exts->police) { |
33be6271 | 2462 | struct tc_action *act = tcf_exts_first_act(exts); |
5da57f42 | 2463 | nest = nla_nest_start(skb, exts->police); |
63acd680 | 2464 | if (nest == NULL || !act) |
4b3550ef | 2465 | goto nla_put_failure; |
33be6271 | 2466 | if (tcf_action_dump_old(skb, act, 0, 0) < 0) |
add93b61 | 2467 | goto nla_put_failure; |
4b3550ef | 2468 | nla_nest_end(skb, nest); |
1da177e4 LT |
2469 | } |
2470 | } | |
1da177e4 | 2471 | return 0; |
9cc63db5 CW |
2472 | |
2473 | nla_put_failure: | |
2474 | nla_nest_cancel(skb, nest); | |
1da177e4 | 2475 | return -1; |
9cc63db5 CW |
2476 | #else |
2477 | return 0; | |
2478 | #endif | |
1da177e4 | 2479 | } |
aa767bfe | 2480 | EXPORT_SYMBOL(tcf_exts_dump); |
1da177e4 | 2481 | |
aa767bfe | 2482 | |
5da57f42 | 2483 | int tcf_exts_dump_stats(struct sk_buff *skb, struct tcf_exts *exts) |
1da177e4 LT |
2484 | { |
2485 | #ifdef CONFIG_NET_CLS_ACT | |
33be6271 | 2486 | struct tc_action *a = tcf_exts_first_act(exts); |
b057df24 | 2487 | if (a != NULL && tcf_action_copy_stats(skb, a, 1) < 0) |
33be6271 | 2488 | return -1; |
1da177e4 LT |
2489 | #endif |
2490 | return 0; | |
1da177e4 | 2491 | } |
aa767bfe | 2492 | EXPORT_SYMBOL(tcf_exts_dump_stats); |
1da177e4 | 2493 | |
aeb3fecd CW |
2494 | int tc_setup_cb_call(struct tcf_block *block, enum tc_setup_type type, |
2495 | void *type_data, bool err_stop) | |
717503b9 | 2496 | { |
aeb3fecd CW |
2497 | struct tcf_block_cb *block_cb; |
2498 | int ok_count = 0; | |
2499 | int err; | |
2500 | ||
2501 | /* Make sure all netdevs sharing this block are offload-capable. */ | |
2502 | if (block->nooffloaddevcnt && err_stop) | |
2503 | return -EOPNOTSUPP; | |
2504 | ||
2505 | list_for_each_entry(block_cb, &block->cb_list, list) { | |
2506 | err = block_cb->cb(type, type_data, block_cb->cb_priv); | |
2507 | if (err) { | |
2508 | if (err_stop) | |
2509 | return err; | |
2510 | } else { | |
2511 | ok_count++; | |
2512 | } | |
2513 | } | |
2514 | return ok_count; | |
717503b9 JP |
2515 | } |
2516 | EXPORT_SYMBOL(tc_setup_cb_call); | |
b3f55bdd | 2517 | |
48617387 JP |
2518 | static __net_init int tcf_net_init(struct net *net) |
2519 | { | |
2520 | struct tcf_net *tn = net_generic(net, tcf_net_id); | |
2521 | ||
ab281629 | 2522 | spin_lock_init(&tn->idr_lock); |
48617387 JP |
2523 | idr_init(&tn->idr); |
2524 | return 0; | |
2525 | } | |
2526 | ||
2527 | static void __net_exit tcf_net_exit(struct net *net) | |
2528 | { | |
2529 | struct tcf_net *tn = net_generic(net, tcf_net_id); | |
2530 | ||
2531 | idr_destroy(&tn->idr); | |
2532 | } | |
2533 | ||
2534 | static struct pernet_operations tcf_net_ops = { | |
2535 | .init = tcf_net_init, | |
2536 | .exit = tcf_net_exit, | |
2537 | .id = &tcf_net_id, | |
2538 | .size = sizeof(struct tcf_net), | |
2539 | }; | |
2540 | ||
1da177e4 LT |
2541 | static int __init tc_filter_init(void) |
2542 | { | |
48617387 JP |
2543 | int err; |
2544 | ||
7aa0045d CW |
2545 | tc_filter_wq = alloc_ordered_workqueue("tc_filter_workqueue", 0); |
2546 | if (!tc_filter_wq) | |
2547 | return -ENOMEM; | |
2548 | ||
48617387 JP |
2549 | err = register_pernet_subsys(&tcf_net_ops); |
2550 | if (err) | |
2551 | goto err_register_pernet_subsys; | |
2552 | ||
7f76fa36 JH |
2553 | err = rhashtable_init(&indr_setup_block_ht, |
2554 | &tc_indr_setup_block_ht_params); | |
2555 | if (err) | |
2556 | goto err_rhash_setup_block_ht; | |
2557 | ||
c431f89b VB |
2558 | rtnl_register(PF_UNSPEC, RTM_NEWTFILTER, tc_new_tfilter, NULL, 0); |
2559 | rtnl_register(PF_UNSPEC, RTM_DELTFILTER, tc_del_tfilter, NULL, 0); | |
2560 | rtnl_register(PF_UNSPEC, RTM_GETTFILTER, tc_get_tfilter, | |
b97bac64 | 2561 | tc_dump_tfilter, 0); |
32a4f5ec JP |
2562 | rtnl_register(PF_UNSPEC, RTM_NEWCHAIN, tc_ctl_chain, NULL, 0); |
2563 | rtnl_register(PF_UNSPEC, RTM_DELCHAIN, tc_ctl_chain, NULL, 0); | |
2564 | rtnl_register(PF_UNSPEC, RTM_GETCHAIN, tc_ctl_chain, | |
2565 | tc_dump_chain, 0); | |
1da177e4 | 2566 | |
1da177e4 | 2567 | return 0; |
48617387 | 2568 | |
7f76fa36 JH |
2569 | err_rhash_setup_block_ht: |
2570 | unregister_pernet_subsys(&tcf_net_ops); | |
48617387 JP |
2571 | err_register_pernet_subsys: |
2572 | destroy_workqueue(tc_filter_wq); | |
2573 | return err; | |
1da177e4 LT |
2574 | } |
2575 | ||
2576 | subsys_initcall(tc_filter_init); |