Commit | Line | Data |
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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> |
b854272b DL |
28 | #include <net/net_namespace.h> |
29 | #include <net/sock.h> | |
dc5fc579 | 30 | #include <net/netlink.h> |
1da177e4 LT |
31 | #include <net/pkt_sched.h> |
32 | #include <net/pkt_cls.h> | |
33 | ||
1da177e4 | 34 | /* The list of all installed classifier types */ |
36272874 | 35 | static LIST_HEAD(tcf_proto_base); |
1da177e4 LT |
36 | |
37 | /* Protects list of registered TC modules. It is pure SMP lock. */ | |
38 | static DEFINE_RWLOCK(cls_mod_lock); | |
39 | ||
40 | /* Find classifier type by string name */ | |
41 | ||
33a48927 | 42 | static const struct tcf_proto_ops *tcf_proto_lookup_ops(const char *kind) |
1da177e4 | 43 | { |
dcd76081 | 44 | const struct tcf_proto_ops *t, *res = NULL; |
1da177e4 LT |
45 | |
46 | if (kind) { | |
47 | read_lock(&cls_mod_lock); | |
36272874 | 48 | list_for_each_entry(t, &tcf_proto_base, head) { |
33a48927 | 49 | if (strcmp(kind, t->kind) == 0) { |
dcd76081 ED |
50 | if (try_module_get(t->owner)) |
51 | res = t; | |
1da177e4 LT |
52 | break; |
53 | } | |
54 | } | |
55 | read_unlock(&cls_mod_lock); | |
56 | } | |
dcd76081 | 57 | return res; |
1da177e4 LT |
58 | } |
59 | ||
60 | /* Register(unregister) new classifier type */ | |
61 | ||
62 | int register_tcf_proto_ops(struct tcf_proto_ops *ops) | |
63 | { | |
36272874 | 64 | struct tcf_proto_ops *t; |
1da177e4 LT |
65 | int rc = -EEXIST; |
66 | ||
67 | write_lock(&cls_mod_lock); | |
36272874 | 68 | list_for_each_entry(t, &tcf_proto_base, head) |
1da177e4 LT |
69 | if (!strcmp(ops->kind, t->kind)) |
70 | goto out; | |
71 | ||
36272874 | 72 | list_add_tail(&ops->head, &tcf_proto_base); |
1da177e4 LT |
73 | rc = 0; |
74 | out: | |
75 | write_unlock(&cls_mod_lock); | |
76 | return rc; | |
77 | } | |
aa767bfe | 78 | EXPORT_SYMBOL(register_tcf_proto_ops); |
1da177e4 | 79 | |
7aa0045d CW |
80 | static struct workqueue_struct *tc_filter_wq; |
81 | ||
1da177e4 LT |
82 | int unregister_tcf_proto_ops(struct tcf_proto_ops *ops) |
83 | { | |
36272874 | 84 | struct tcf_proto_ops *t; |
1da177e4 LT |
85 | int rc = -ENOENT; |
86 | ||
c78e1746 DB |
87 | /* Wait for outstanding call_rcu()s, if any, from a |
88 | * tcf_proto_ops's destroy() handler. | |
89 | */ | |
90 | rcu_barrier(); | |
7aa0045d | 91 | flush_workqueue(tc_filter_wq); |
c78e1746 | 92 | |
1da177e4 | 93 | write_lock(&cls_mod_lock); |
dcd76081 ED |
94 | list_for_each_entry(t, &tcf_proto_base, head) { |
95 | if (t == ops) { | |
96 | list_del(&t->head); | |
97 | rc = 0; | |
1da177e4 | 98 | break; |
dcd76081 ED |
99 | } |
100 | } | |
1da177e4 LT |
101 | write_unlock(&cls_mod_lock); |
102 | return rc; | |
103 | } | |
aa767bfe | 104 | EXPORT_SYMBOL(unregister_tcf_proto_ops); |
1da177e4 | 105 | |
aaa908ff | 106 | bool tcf_queue_work(struct rcu_work *rwork, work_func_t func) |
7aa0045d | 107 | { |
aaa908ff CW |
108 | INIT_RCU_WORK(rwork, func); |
109 | return queue_rcu_work(tc_filter_wq, rwork); | |
7aa0045d CW |
110 | } |
111 | EXPORT_SYMBOL(tcf_queue_work); | |
112 | ||
1da177e4 LT |
113 | /* Select new prio value from the range, managed by kernel. */ |
114 | ||
aa767bfe | 115 | static inline u32 tcf_auto_prio(struct tcf_proto *tp) |
1da177e4 | 116 | { |
aa767bfe | 117 | u32 first = TC_H_MAKE(0xC0000000U, 0U); |
1da177e4 LT |
118 | |
119 | if (tp) | |
cc7ec456 | 120 | first = tp->prio - 1; |
1da177e4 | 121 | |
7961973a | 122 | return TC_H_MAJ(first); |
1da177e4 LT |
123 | } |
124 | ||
33a48927 | 125 | static struct tcf_proto *tcf_proto_create(const char *kind, u32 protocol, |
c35a4acc AA |
126 | u32 prio, struct tcf_chain *chain, |
127 | struct netlink_ext_ack *extack) | |
33a48927 JP |
128 | { |
129 | struct tcf_proto *tp; | |
130 | int err; | |
131 | ||
132 | tp = kzalloc(sizeof(*tp), GFP_KERNEL); | |
133 | if (!tp) | |
134 | return ERR_PTR(-ENOBUFS); | |
135 | ||
136 | err = -ENOENT; | |
137 | tp->ops = tcf_proto_lookup_ops(kind); | |
138 | if (!tp->ops) { | |
139 | #ifdef CONFIG_MODULES | |
140 | rtnl_unlock(); | |
141 | request_module("cls_%s", kind); | |
142 | rtnl_lock(); | |
143 | tp->ops = tcf_proto_lookup_ops(kind); | |
144 | /* We dropped the RTNL semaphore in order to perform | |
145 | * the module load. So, even if we succeeded in loading | |
146 | * the module we have to replay the request. We indicate | |
147 | * this using -EAGAIN. | |
148 | */ | |
149 | if (tp->ops) { | |
150 | module_put(tp->ops->owner); | |
151 | err = -EAGAIN; | |
152 | } else { | |
c35a4acc | 153 | NL_SET_ERR_MSG(extack, "TC classifier not found"); |
33a48927 JP |
154 | err = -ENOENT; |
155 | } | |
33a48927 | 156 | #endif |
d68d75fd | 157 | goto errout; |
33a48927 JP |
158 | } |
159 | tp->classify = tp->ops->classify; | |
160 | tp->protocol = protocol; | |
161 | tp->prio = prio; | |
5bc17018 | 162 | tp->chain = chain; |
33a48927 JP |
163 | |
164 | err = tp->ops->init(tp); | |
165 | if (err) { | |
166 | module_put(tp->ops->owner); | |
167 | goto errout; | |
168 | } | |
169 | return tp; | |
170 | ||
171 | errout: | |
172 | kfree(tp); | |
173 | return ERR_PTR(err); | |
174 | } | |
175 | ||
715df5ec JK |
176 | static void tcf_proto_destroy(struct tcf_proto *tp, |
177 | struct netlink_ext_ack *extack) | |
cf1facda | 178 | { |
715df5ec | 179 | tp->ops->destroy(tp, extack); |
763dbf63 WC |
180 | module_put(tp->ops->owner); |
181 | kfree_rcu(tp, rcu); | |
cf1facda JP |
182 | } |
183 | ||
a9b19443 JP |
184 | struct tcf_filter_chain_list_item { |
185 | struct list_head list; | |
186 | tcf_chain_head_change_t *chain_head_change; | |
187 | void *chain_head_change_priv; | |
188 | }; | |
189 | ||
5bc17018 JP |
190 | static struct tcf_chain *tcf_chain_create(struct tcf_block *block, |
191 | u32 chain_index) | |
2190d1d0 | 192 | { |
5bc17018 JP |
193 | struct tcf_chain *chain; |
194 | ||
195 | chain = kzalloc(sizeof(*chain), GFP_KERNEL); | |
196 | if (!chain) | |
197 | return NULL; | |
a9b19443 | 198 | INIT_LIST_HEAD(&chain->filter_chain_list); |
5bc17018 JP |
199 | list_add_tail(&chain->list, &block->chain_list); |
200 | chain->block = block; | |
201 | chain->index = chain_index; | |
e2ef7544 | 202 | chain->refcnt = 1; |
5bc17018 | 203 | return chain; |
2190d1d0 JP |
204 | } |
205 | ||
a9b19443 JP |
206 | static void tcf_chain_head_change_item(struct tcf_filter_chain_list_item *item, |
207 | struct tcf_proto *tp_head) | |
208 | { | |
209 | if (item->chain_head_change) | |
210 | item->chain_head_change(tp_head, item->chain_head_change_priv); | |
211 | } | |
c7eb7d72 JP |
212 | static void tcf_chain_head_change(struct tcf_chain *chain, |
213 | struct tcf_proto *tp_head) | |
214 | { | |
a9b19443 JP |
215 | struct tcf_filter_chain_list_item *item; |
216 | ||
217 | list_for_each_entry(item, &chain->filter_chain_list, list) | |
218 | tcf_chain_head_change_item(item, tp_head); | |
c7eb7d72 JP |
219 | } |
220 | ||
f93e1cdc | 221 | static void tcf_chain_flush(struct tcf_chain *chain) |
cf1facda | 222 | { |
d7aa04a5 | 223 | struct tcf_proto *tp = rtnl_dereference(chain->filter_chain); |
cf1facda | 224 | |
c7eb7d72 | 225 | tcf_chain_head_change(chain, NULL); |
d7aa04a5 | 226 | while (tp) { |
2190d1d0 | 227 | RCU_INIT_POINTER(chain->filter_chain, tp->next); |
715df5ec | 228 | tcf_proto_destroy(tp, NULL); |
d7aa04a5 RK |
229 | tp = rtnl_dereference(chain->filter_chain); |
230 | tcf_chain_put(chain); | |
cf1facda | 231 | } |
f93e1cdc JP |
232 | } |
233 | ||
234 | static void tcf_chain_destroy(struct tcf_chain *chain) | |
235 | { | |
efbf7897 CW |
236 | struct tcf_block *block = chain->block; |
237 | ||
e2ef7544 CW |
238 | list_del(&chain->list); |
239 | kfree(chain); | |
efbf7897 CW |
240 | if (list_empty(&block->chain_list)) |
241 | kfree(block); | |
e2ef7544 | 242 | } |
744a4cf6 | 243 | |
e2ef7544 CW |
244 | static void tcf_chain_hold(struct tcf_chain *chain) |
245 | { | |
246 | ++chain->refcnt; | |
2190d1d0 JP |
247 | } |
248 | ||
367a8ce8 WC |
249 | struct tcf_chain *tcf_chain_get(struct tcf_block *block, u32 chain_index, |
250 | bool create) | |
5bc17018 JP |
251 | { |
252 | struct tcf_chain *chain; | |
253 | ||
254 | list_for_each_entry(chain, &block->chain_list, list) { | |
e2ef7544 CW |
255 | if (chain->index == chain_index) { |
256 | tcf_chain_hold(chain); | |
257 | return chain; | |
258 | } | |
5bc17018 | 259 | } |
80532384 | 260 | |
e2ef7544 | 261 | return create ? tcf_chain_create(block, chain_index) : NULL; |
5bc17018 JP |
262 | } |
263 | EXPORT_SYMBOL(tcf_chain_get); | |
264 | ||
265 | void tcf_chain_put(struct tcf_chain *chain) | |
266 | { | |
e2ef7544 | 267 | if (--chain->refcnt == 0) |
5bc17018 JP |
268 | tcf_chain_destroy(chain); |
269 | } | |
270 | EXPORT_SYMBOL(tcf_chain_put); | |
271 | ||
caa72601 JP |
272 | static bool tcf_block_offload_in_use(struct tcf_block *block) |
273 | { | |
274 | return block->offloadcnt; | |
275 | } | |
276 | ||
277 | static int tcf_block_offload_cmd(struct tcf_block *block, | |
278 | struct net_device *dev, | |
279 | struct tcf_block_ext_info *ei, | |
60513bd8 JH |
280 | enum tc_block_command command, |
281 | struct netlink_ext_ack *extack) | |
8c4083b3 | 282 | { |
8c4083b3 JP |
283 | struct tc_block_offload bo = {}; |
284 | ||
8c4083b3 JP |
285 | bo.command = command; |
286 | bo.binder_type = ei->binder_type; | |
287 | bo.block = block; | |
60513bd8 | 288 | bo.extack = extack; |
caa72601 | 289 | return dev->netdev_ops->ndo_setup_tc(dev, TC_SETUP_BLOCK, &bo); |
8c4083b3 JP |
290 | } |
291 | ||
caa72601 | 292 | static int tcf_block_offload_bind(struct tcf_block *block, struct Qdisc *q, |
60513bd8 JH |
293 | struct tcf_block_ext_info *ei, |
294 | struct netlink_ext_ack *extack) | |
8c4083b3 | 295 | { |
caa72601 JP |
296 | struct net_device *dev = q->dev_queue->dev; |
297 | int err; | |
298 | ||
299 | if (!dev->netdev_ops->ndo_setup_tc) | |
300 | goto no_offload_dev_inc; | |
301 | ||
302 | /* If tc offload feature is disabled and the block we try to bind | |
303 | * to already has some offloaded filters, forbid to bind. | |
304 | */ | |
60513bd8 JH |
305 | if (!tc_can_offload(dev) && tcf_block_offload_in_use(block)) { |
306 | NL_SET_ERR_MSG(extack, "Bind to offloaded block failed as dev has offload disabled"); | |
caa72601 | 307 | return -EOPNOTSUPP; |
60513bd8 | 308 | } |
caa72601 | 309 | |
60513bd8 | 310 | err = tcf_block_offload_cmd(block, dev, ei, TC_BLOCK_BIND, extack); |
caa72601 JP |
311 | if (err == -EOPNOTSUPP) |
312 | goto no_offload_dev_inc; | |
313 | return err; | |
314 | ||
315 | no_offload_dev_inc: | |
316 | if (tcf_block_offload_in_use(block)) | |
317 | return -EOPNOTSUPP; | |
318 | block->nooffloaddevcnt++; | |
319 | return 0; | |
8c4083b3 JP |
320 | } |
321 | ||
322 | static void tcf_block_offload_unbind(struct tcf_block *block, struct Qdisc *q, | |
323 | struct tcf_block_ext_info *ei) | |
324 | { | |
caa72601 JP |
325 | struct net_device *dev = q->dev_queue->dev; |
326 | int err; | |
327 | ||
328 | if (!dev->netdev_ops->ndo_setup_tc) | |
329 | goto no_offload_dev_dec; | |
60513bd8 | 330 | err = tcf_block_offload_cmd(block, dev, ei, TC_BLOCK_UNBIND, NULL); |
caa72601 JP |
331 | if (err == -EOPNOTSUPP) |
332 | goto no_offload_dev_dec; | |
333 | return; | |
334 | ||
335 | no_offload_dev_dec: | |
336 | WARN_ON(block->nooffloaddevcnt-- == 0); | |
8c4083b3 JP |
337 | } |
338 | ||
a9b19443 JP |
339 | static int |
340 | tcf_chain_head_change_cb_add(struct tcf_chain *chain, | |
341 | struct tcf_block_ext_info *ei, | |
342 | struct netlink_ext_ack *extack) | |
343 | { | |
344 | struct tcf_filter_chain_list_item *item; | |
345 | ||
346 | item = kmalloc(sizeof(*item), GFP_KERNEL); | |
347 | if (!item) { | |
348 | NL_SET_ERR_MSG(extack, "Memory allocation for head change callback item failed"); | |
349 | return -ENOMEM; | |
350 | } | |
351 | item->chain_head_change = ei->chain_head_change; | |
352 | item->chain_head_change_priv = ei->chain_head_change_priv; | |
353 | if (chain->filter_chain) | |
354 | tcf_chain_head_change_item(item, chain->filter_chain); | |
355 | list_add(&item->list, &chain->filter_chain_list); | |
356 | return 0; | |
357 | } | |
358 | ||
359 | static void | |
360 | tcf_chain_head_change_cb_del(struct tcf_chain *chain, | |
361 | struct tcf_block_ext_info *ei) | |
362 | { | |
363 | struct tcf_filter_chain_list_item *item; | |
364 | ||
365 | list_for_each_entry(item, &chain->filter_chain_list, list) { | |
366 | if ((!ei->chain_head_change && !ei->chain_head_change_priv) || | |
367 | (item->chain_head_change == ei->chain_head_change && | |
368 | item->chain_head_change_priv == ei->chain_head_change_priv)) { | |
369 | tcf_chain_head_change_item(item, NULL); | |
370 | list_del(&item->list); | |
371 | kfree(item); | |
372 | return; | |
373 | } | |
374 | } | |
375 | WARN_ON(1); | |
376 | } | |
377 | ||
48617387 JP |
378 | struct tcf_net { |
379 | struct idr idr; | |
380 | }; | |
381 | ||
382 | static unsigned int tcf_net_id; | |
383 | ||
384 | static int tcf_block_insert(struct tcf_block *block, struct net *net, | |
bb047ddd | 385 | struct netlink_ext_ack *extack) |
a9b19443 | 386 | { |
48617387 | 387 | struct tcf_net *tn = net_generic(net, tcf_net_id); |
48617387 | 388 | |
bb047ddd JP |
389 | return idr_alloc_u32(&tn->idr, block, &block->index, block->index, |
390 | GFP_KERNEL); | |
a9b19443 JP |
391 | } |
392 | ||
48617387 JP |
393 | static void tcf_block_remove(struct tcf_block *block, struct net *net) |
394 | { | |
395 | struct tcf_net *tn = net_generic(net, tcf_net_id); | |
396 | ||
9c160941 | 397 | idr_remove(&tn->idr, block->index); |
48617387 JP |
398 | } |
399 | ||
400 | static struct tcf_block *tcf_block_create(struct net *net, struct Qdisc *q, | |
bb047ddd | 401 | u32 block_index, |
48617387 | 402 | struct netlink_ext_ack *extack) |
6529eaba | 403 | { |
48617387 | 404 | struct tcf_block *block; |
5bc17018 | 405 | struct tcf_chain *chain; |
2190d1d0 | 406 | int err; |
6529eaba | 407 | |
48617387 | 408 | block = kzalloc(sizeof(*block), GFP_KERNEL); |
8d1a77f9 AA |
409 | if (!block) { |
410 | NL_SET_ERR_MSG(extack, "Memory allocation for block failed"); | |
48617387 | 411 | return ERR_PTR(-ENOMEM); |
8d1a77f9 | 412 | } |
5bc17018 | 413 | INIT_LIST_HEAD(&block->chain_list); |
acb67442 | 414 | INIT_LIST_HEAD(&block->cb_list); |
f36fe1c4 | 415 | INIT_LIST_HEAD(&block->owner_list); |
acb67442 | 416 | |
5bc17018 JP |
417 | /* Create chain 0 by default, it has to be always present. */ |
418 | chain = tcf_chain_create(block, 0); | |
419 | if (!chain) { | |
8d1a77f9 | 420 | NL_SET_ERR_MSG(extack, "Failed to create new tcf chain"); |
2190d1d0 JP |
421 | err = -ENOMEM; |
422 | goto err_chain_create; | |
423 | } | |
48617387 JP |
424 | block->refcnt = 1; |
425 | block->net = net; | |
bb047ddd JP |
426 | block->index = block_index; |
427 | ||
428 | /* Don't store q pointer for blocks which are shared */ | |
429 | if (!tcf_block_shared(block)) | |
430 | block->q = q; | |
48617387 JP |
431 | return block; |
432 | ||
433 | err_chain_create: | |
434 | kfree(block); | |
435 | return ERR_PTR(err); | |
436 | } | |
437 | ||
438 | static struct tcf_block *tcf_block_lookup(struct net *net, u32 block_index) | |
439 | { | |
440 | struct tcf_net *tn = net_generic(net, tcf_net_id); | |
441 | ||
322d884b | 442 | return idr_find(&tn->idr, block_index); |
48617387 JP |
443 | } |
444 | ||
c431f89b VB |
445 | /* Find tcf block. |
446 | * Set q, parent, cl when appropriate. | |
447 | */ | |
448 | ||
449 | static struct tcf_block *tcf_block_find(struct net *net, struct Qdisc **q, | |
450 | u32 *parent, unsigned long *cl, | |
451 | int ifindex, u32 block_index, | |
452 | struct netlink_ext_ack *extack) | |
453 | { | |
454 | struct tcf_block *block; | |
455 | ||
456 | if (ifindex == TCM_IFINDEX_MAGIC_BLOCK) { | |
457 | block = tcf_block_lookup(net, block_index); | |
458 | if (!block) { | |
459 | NL_SET_ERR_MSG(extack, "Block of given index was not found"); | |
460 | return ERR_PTR(-EINVAL); | |
461 | } | |
462 | } else { | |
463 | const struct Qdisc_class_ops *cops; | |
464 | struct net_device *dev; | |
465 | ||
466 | /* Find link */ | |
467 | dev = __dev_get_by_index(net, ifindex); | |
468 | if (!dev) | |
469 | return ERR_PTR(-ENODEV); | |
470 | ||
471 | /* Find qdisc */ | |
472 | if (!*parent) { | |
473 | *q = dev->qdisc; | |
474 | *parent = (*q)->handle; | |
475 | } else { | |
476 | *q = qdisc_lookup(dev, TC_H_MAJ(*parent)); | |
477 | if (!*q) { | |
478 | NL_SET_ERR_MSG(extack, "Parent Qdisc doesn't exists"); | |
479 | return ERR_PTR(-EINVAL); | |
480 | } | |
481 | } | |
482 | ||
483 | /* Is it classful? */ | |
484 | cops = (*q)->ops->cl_ops; | |
485 | if (!cops) { | |
486 | NL_SET_ERR_MSG(extack, "Qdisc not classful"); | |
487 | return ERR_PTR(-EINVAL); | |
488 | } | |
489 | ||
490 | if (!cops->tcf_block) { | |
491 | NL_SET_ERR_MSG(extack, "Class doesn't support blocks"); | |
492 | return ERR_PTR(-EOPNOTSUPP); | |
493 | } | |
494 | ||
495 | /* Do we search for filter, attached to class? */ | |
496 | if (TC_H_MIN(*parent)) { | |
497 | *cl = cops->find(*q, *parent); | |
498 | if (*cl == 0) { | |
499 | NL_SET_ERR_MSG(extack, "Specified class doesn't exist"); | |
500 | return ERR_PTR(-ENOENT); | |
501 | } | |
502 | } | |
503 | ||
504 | /* And the last stroke */ | |
505 | block = cops->tcf_block(*q, *cl, extack); | |
506 | if (!block) | |
507 | return ERR_PTR(-EINVAL); | |
508 | if (tcf_block_shared(block)) { | |
509 | NL_SET_ERR_MSG(extack, "This filter block is shared. Please use the block index to manipulate the filters"); | |
510 | return ERR_PTR(-EOPNOTSUPP); | |
511 | } | |
512 | } | |
513 | ||
514 | return block; | |
515 | } | |
516 | ||
48617387 JP |
517 | static struct tcf_chain *tcf_block_chain_zero(struct tcf_block *block) |
518 | { | |
519 | return list_first_entry(&block->chain_list, struct tcf_chain, list); | |
520 | } | |
521 | ||
f36fe1c4 JP |
522 | struct tcf_block_owner_item { |
523 | struct list_head list; | |
524 | struct Qdisc *q; | |
525 | enum tcf_block_binder_type binder_type; | |
526 | }; | |
527 | ||
528 | static void | |
529 | tcf_block_owner_netif_keep_dst(struct tcf_block *block, | |
530 | struct Qdisc *q, | |
531 | enum tcf_block_binder_type binder_type) | |
532 | { | |
533 | if (block->keep_dst && | |
534 | binder_type != TCF_BLOCK_BINDER_TYPE_CLSACT_INGRESS && | |
535 | binder_type != TCF_BLOCK_BINDER_TYPE_CLSACT_EGRESS) | |
536 | netif_keep_dst(qdisc_dev(q)); | |
537 | } | |
538 | ||
539 | void tcf_block_netif_keep_dst(struct tcf_block *block) | |
540 | { | |
541 | struct tcf_block_owner_item *item; | |
542 | ||
543 | block->keep_dst = true; | |
544 | list_for_each_entry(item, &block->owner_list, list) | |
545 | tcf_block_owner_netif_keep_dst(block, item->q, | |
546 | item->binder_type); | |
547 | } | |
548 | EXPORT_SYMBOL(tcf_block_netif_keep_dst); | |
549 | ||
550 | static int tcf_block_owner_add(struct tcf_block *block, | |
551 | struct Qdisc *q, | |
552 | enum tcf_block_binder_type binder_type) | |
553 | { | |
554 | struct tcf_block_owner_item *item; | |
555 | ||
556 | item = kmalloc(sizeof(*item), GFP_KERNEL); | |
557 | if (!item) | |
558 | return -ENOMEM; | |
559 | item->q = q; | |
560 | item->binder_type = binder_type; | |
561 | list_add(&item->list, &block->owner_list); | |
562 | return 0; | |
563 | } | |
564 | ||
565 | static void tcf_block_owner_del(struct tcf_block *block, | |
566 | struct Qdisc *q, | |
567 | enum tcf_block_binder_type binder_type) | |
568 | { | |
569 | struct tcf_block_owner_item *item; | |
570 | ||
571 | list_for_each_entry(item, &block->owner_list, list) { | |
572 | if (item->q == q && item->binder_type == binder_type) { | |
573 | list_del(&item->list); | |
574 | kfree(item); | |
575 | return; | |
576 | } | |
577 | } | |
578 | WARN_ON(1); | |
579 | } | |
580 | ||
48617387 JP |
581 | int tcf_block_get_ext(struct tcf_block **p_block, struct Qdisc *q, |
582 | struct tcf_block_ext_info *ei, | |
583 | struct netlink_ext_ack *extack) | |
584 | { | |
585 | struct net *net = qdisc_net(q); | |
586 | struct tcf_block *block = NULL; | |
587 | bool created = false; | |
588 | int err; | |
589 | ||
590 | if (ei->block_index) { | |
591 | /* block_index not 0 means the shared block is requested */ | |
592 | block = tcf_block_lookup(net, ei->block_index); | |
593 | if (block) | |
594 | block->refcnt++; | |
595 | } | |
596 | ||
597 | if (!block) { | |
bb047ddd | 598 | block = tcf_block_create(net, q, ei->block_index, extack); |
48617387 JP |
599 | if (IS_ERR(block)) |
600 | return PTR_ERR(block); | |
601 | created = true; | |
bb047ddd JP |
602 | if (tcf_block_shared(block)) { |
603 | err = tcf_block_insert(block, net, extack); | |
48617387 JP |
604 | if (err) |
605 | goto err_block_insert; | |
606 | } | |
607 | } | |
608 | ||
f36fe1c4 JP |
609 | err = tcf_block_owner_add(block, q, ei->binder_type); |
610 | if (err) | |
611 | goto err_block_owner_add; | |
612 | ||
613 | tcf_block_owner_netif_keep_dst(block, q, ei->binder_type); | |
614 | ||
a9b19443 JP |
615 | err = tcf_chain_head_change_cb_add(tcf_block_chain_zero(block), |
616 | ei, extack); | |
617 | if (err) | |
618 | goto err_chain_head_change_cb_add; | |
caa72601 | 619 | |
60513bd8 | 620 | err = tcf_block_offload_bind(block, q, ei, extack); |
caa72601 JP |
621 | if (err) |
622 | goto err_block_offload_bind; | |
623 | ||
6529eaba JP |
624 | *p_block = block; |
625 | return 0; | |
2190d1d0 | 626 | |
caa72601 JP |
627 | err_block_offload_bind: |
628 | tcf_chain_head_change_cb_del(tcf_block_chain_zero(block), ei); | |
a9b19443 | 629 | err_chain_head_change_cb_add: |
f36fe1c4 JP |
630 | tcf_block_owner_del(block, q, ei->binder_type); |
631 | err_block_owner_add: | |
48617387 JP |
632 | if (created) { |
633 | if (tcf_block_shared(block)) | |
634 | tcf_block_remove(block, net); | |
635 | err_block_insert: | |
636 | kfree(tcf_block_chain_zero(block)); | |
637 | kfree(block); | |
638 | } else { | |
639 | block->refcnt--; | |
640 | } | |
2190d1d0 | 641 | return err; |
6529eaba | 642 | } |
8c4083b3 JP |
643 | EXPORT_SYMBOL(tcf_block_get_ext); |
644 | ||
c7eb7d72 JP |
645 | static void tcf_chain_head_change_dflt(struct tcf_proto *tp_head, void *priv) |
646 | { | |
647 | struct tcf_proto __rcu **p_filter_chain = priv; | |
648 | ||
649 | rcu_assign_pointer(*p_filter_chain, tp_head); | |
650 | } | |
651 | ||
8c4083b3 | 652 | int tcf_block_get(struct tcf_block **p_block, |
8d1a77f9 AA |
653 | struct tcf_proto __rcu **p_filter_chain, struct Qdisc *q, |
654 | struct netlink_ext_ack *extack) | |
8c4083b3 | 655 | { |
c7eb7d72 JP |
656 | struct tcf_block_ext_info ei = { |
657 | .chain_head_change = tcf_chain_head_change_dflt, | |
658 | .chain_head_change_priv = p_filter_chain, | |
659 | }; | |
8c4083b3 | 660 | |
c7eb7d72 | 661 | WARN_ON(!p_filter_chain); |
8d1a77f9 | 662 | return tcf_block_get_ext(p_block, q, &ei, extack); |
8c4083b3 | 663 | } |
6529eaba JP |
664 | EXPORT_SYMBOL(tcf_block_get); |
665 | ||
7aa0045d | 666 | /* XXX: Standalone actions are not allowed to jump to any chain, and bound |
a60b3f51 | 667 | * actions should be all removed after flushing. |
7aa0045d | 668 | */ |
c7eb7d72 | 669 | void tcf_block_put_ext(struct tcf_block *block, struct Qdisc *q, |
e1ea2f98 | 670 | struct tcf_block_ext_info *ei) |
7aa0045d | 671 | { |
efbf7897 | 672 | struct tcf_chain *chain, *tmp; |
1697c4bb | 673 | |
c30abd5e DM |
674 | if (!block) |
675 | return; | |
a9b19443 | 676 | tcf_chain_head_change_cb_del(tcf_block_chain_zero(block), ei); |
f36fe1c4 | 677 | tcf_block_owner_del(block, q, ei->binder_type); |
a60b3f51 | 678 | |
48617387 JP |
679 | if (--block->refcnt == 0) { |
680 | if (tcf_block_shared(block)) | |
681 | tcf_block_remove(block, block->net); | |
682 | ||
683 | /* Hold a refcnt for all chains, so that they don't disappear | |
684 | * while we are iterating. | |
685 | */ | |
686 | list_for_each_entry(chain, &block->chain_list, list) | |
687 | tcf_chain_hold(chain); | |
688 | ||
689 | list_for_each_entry(chain, &block->chain_list, list) | |
690 | tcf_chain_flush(chain); | |
691 | } | |
e2ef7544 | 692 | |
4bb1b116 JP |
693 | tcf_block_offload_unbind(block, q, ei); |
694 | ||
48617387 JP |
695 | if (block->refcnt == 0) { |
696 | /* At this point, all the chains should have refcnt >= 1. */ | |
697 | list_for_each_entry_safe(chain, tmp, &block->chain_list, list) | |
698 | tcf_chain_put(chain); | |
df45bf84 | 699 | |
48617387 JP |
700 | /* Finally, put chain 0 and allow block to be freed. */ |
701 | tcf_chain_put(tcf_block_chain_zero(block)); | |
702 | } | |
6529eaba | 703 | } |
8c4083b3 JP |
704 | EXPORT_SYMBOL(tcf_block_put_ext); |
705 | ||
706 | void tcf_block_put(struct tcf_block *block) | |
707 | { | |
708 | struct tcf_block_ext_info ei = {0, }; | |
709 | ||
4853f128 JP |
710 | if (!block) |
711 | return; | |
c7eb7d72 | 712 | tcf_block_put_ext(block, block->q, &ei); |
8c4083b3 | 713 | } |
e1ea2f98 | 714 | |
6529eaba | 715 | EXPORT_SYMBOL(tcf_block_put); |
cf1facda | 716 | |
acb67442 JP |
717 | struct tcf_block_cb { |
718 | struct list_head list; | |
719 | tc_setup_cb_t *cb; | |
720 | void *cb_ident; | |
721 | void *cb_priv; | |
722 | unsigned int refcnt; | |
723 | }; | |
724 | ||
725 | void *tcf_block_cb_priv(struct tcf_block_cb *block_cb) | |
726 | { | |
727 | return block_cb->cb_priv; | |
728 | } | |
729 | EXPORT_SYMBOL(tcf_block_cb_priv); | |
730 | ||
731 | struct tcf_block_cb *tcf_block_cb_lookup(struct tcf_block *block, | |
732 | tc_setup_cb_t *cb, void *cb_ident) | |
733 | { struct tcf_block_cb *block_cb; | |
734 | ||
735 | list_for_each_entry(block_cb, &block->cb_list, list) | |
736 | if (block_cb->cb == cb && block_cb->cb_ident == cb_ident) | |
737 | return block_cb; | |
738 | return NULL; | |
739 | } | |
740 | EXPORT_SYMBOL(tcf_block_cb_lookup); | |
741 | ||
742 | void tcf_block_cb_incref(struct tcf_block_cb *block_cb) | |
743 | { | |
744 | block_cb->refcnt++; | |
745 | } | |
746 | EXPORT_SYMBOL(tcf_block_cb_incref); | |
747 | ||
748 | unsigned int tcf_block_cb_decref(struct tcf_block_cb *block_cb) | |
749 | { | |
750 | return --block_cb->refcnt; | |
751 | } | |
752 | EXPORT_SYMBOL(tcf_block_cb_decref); | |
753 | ||
32636742 JH |
754 | static int |
755 | tcf_block_playback_offloads(struct tcf_block *block, tc_setup_cb_t *cb, | |
756 | void *cb_priv, bool add, bool offload_in_use, | |
757 | struct netlink_ext_ack *extack) | |
758 | { | |
759 | struct tcf_chain *chain; | |
760 | struct tcf_proto *tp; | |
761 | int err; | |
762 | ||
763 | list_for_each_entry(chain, &block->chain_list, list) { | |
764 | for (tp = rtnl_dereference(chain->filter_chain); tp; | |
765 | tp = rtnl_dereference(tp->next)) { | |
766 | if (tp->ops->reoffload) { | |
767 | err = tp->ops->reoffload(tp, add, cb, cb_priv, | |
768 | extack); | |
769 | if (err && add) | |
770 | goto err_playback_remove; | |
771 | } else if (add && offload_in_use) { | |
772 | err = -EOPNOTSUPP; | |
773 | NL_SET_ERR_MSG(extack, "Filter HW offload failed - classifier without re-offloading support"); | |
774 | goto err_playback_remove; | |
775 | } | |
776 | } | |
777 | } | |
778 | ||
779 | return 0; | |
780 | ||
781 | err_playback_remove: | |
782 | tcf_block_playback_offloads(block, cb, cb_priv, false, offload_in_use, | |
783 | extack); | |
784 | return err; | |
785 | } | |
786 | ||
acb67442 JP |
787 | struct tcf_block_cb *__tcf_block_cb_register(struct tcf_block *block, |
788 | tc_setup_cb_t *cb, void *cb_ident, | |
60513bd8 JH |
789 | void *cb_priv, |
790 | struct netlink_ext_ack *extack) | |
acb67442 JP |
791 | { |
792 | struct tcf_block_cb *block_cb; | |
32636742 | 793 | int err; |
acb67442 | 794 | |
32636742 JH |
795 | /* Replay any already present rules */ |
796 | err = tcf_block_playback_offloads(block, cb, cb_priv, true, | |
797 | tcf_block_offload_in_use(block), | |
798 | extack); | |
799 | if (err) | |
800 | return ERR_PTR(err); | |
caa72601 | 801 | |
acb67442 JP |
802 | block_cb = kzalloc(sizeof(*block_cb), GFP_KERNEL); |
803 | if (!block_cb) | |
caa72601 | 804 | return ERR_PTR(-ENOMEM); |
acb67442 JP |
805 | block_cb->cb = cb; |
806 | block_cb->cb_ident = cb_ident; | |
807 | block_cb->cb_priv = cb_priv; | |
808 | list_add(&block_cb->list, &block->cb_list); | |
809 | return block_cb; | |
810 | } | |
811 | EXPORT_SYMBOL(__tcf_block_cb_register); | |
812 | ||
813 | int tcf_block_cb_register(struct tcf_block *block, | |
814 | tc_setup_cb_t *cb, void *cb_ident, | |
60513bd8 | 815 | void *cb_priv, struct netlink_ext_ack *extack) |
acb67442 JP |
816 | { |
817 | struct tcf_block_cb *block_cb; | |
818 | ||
60513bd8 JH |
819 | block_cb = __tcf_block_cb_register(block, cb, cb_ident, cb_priv, |
820 | extack); | |
baa2d2b1 | 821 | return PTR_ERR_OR_ZERO(block_cb); |
acb67442 JP |
822 | } |
823 | EXPORT_SYMBOL(tcf_block_cb_register); | |
824 | ||
32636742 JH |
825 | void __tcf_block_cb_unregister(struct tcf_block *block, |
826 | struct tcf_block_cb *block_cb) | |
acb67442 | 827 | { |
32636742 JH |
828 | tcf_block_playback_offloads(block, block_cb->cb, block_cb->cb_priv, |
829 | false, tcf_block_offload_in_use(block), | |
830 | NULL); | |
acb67442 JP |
831 | list_del(&block_cb->list); |
832 | kfree(block_cb); | |
833 | } | |
834 | EXPORT_SYMBOL(__tcf_block_cb_unregister); | |
835 | ||
836 | void tcf_block_cb_unregister(struct tcf_block *block, | |
837 | tc_setup_cb_t *cb, void *cb_ident) | |
838 | { | |
839 | struct tcf_block_cb *block_cb; | |
840 | ||
841 | block_cb = tcf_block_cb_lookup(block, cb, cb_ident); | |
842 | if (!block_cb) | |
843 | return; | |
32636742 | 844 | __tcf_block_cb_unregister(block, block_cb); |
acb67442 JP |
845 | } |
846 | EXPORT_SYMBOL(tcf_block_cb_unregister); | |
847 | ||
848 | static int tcf_block_cb_call(struct tcf_block *block, enum tc_setup_type type, | |
849 | void *type_data, bool err_stop) | |
850 | { | |
851 | struct tcf_block_cb *block_cb; | |
852 | int ok_count = 0; | |
853 | int err; | |
854 | ||
9a99dc1c DM |
855 | /* Make sure all netdevs sharing this block are offload-capable. */ |
856 | if (block->nooffloaddevcnt && err_stop) | |
857 | return -EOPNOTSUPP; | |
858 | ||
acb67442 JP |
859 | list_for_each_entry(block_cb, &block->cb_list, list) { |
860 | err = block_cb->cb(type, type_data, block_cb->cb_priv); | |
861 | if (err) { | |
862 | if (err_stop) | |
863 | return err; | |
864 | } else { | |
865 | ok_count++; | |
866 | } | |
867 | } | |
868 | return ok_count; | |
869 | } | |
870 | ||
87d83093 JP |
871 | /* Main classifier routine: scans classifier chain attached |
872 | * to this qdisc, (optionally) tests for protocol and asks | |
873 | * specific classifiers. | |
874 | */ | |
875 | int tcf_classify(struct sk_buff *skb, const struct tcf_proto *tp, | |
876 | struct tcf_result *res, bool compat_mode) | |
877 | { | |
878 | __be16 protocol = tc_skb_protocol(skb); | |
879 | #ifdef CONFIG_NET_CLS_ACT | |
880 | const int max_reclassify_loop = 4; | |
ee538dce JP |
881 | const struct tcf_proto *orig_tp = tp; |
882 | const struct tcf_proto *first_tp; | |
87d83093 JP |
883 | int limit = 0; |
884 | ||
885 | reclassify: | |
886 | #endif | |
887 | for (; tp; tp = rcu_dereference_bh(tp->next)) { | |
888 | int err; | |
889 | ||
890 | if (tp->protocol != protocol && | |
891 | tp->protocol != htons(ETH_P_ALL)) | |
892 | continue; | |
893 | ||
894 | err = tp->classify(skb, tp, res); | |
895 | #ifdef CONFIG_NET_CLS_ACT | |
db50514f | 896 | if (unlikely(err == TC_ACT_RECLASSIFY && !compat_mode)) { |
ee538dce | 897 | first_tp = orig_tp; |
87d83093 | 898 | goto reset; |
db50514f | 899 | } else if (unlikely(TC_ACT_EXT_CMP(err, TC_ACT_GOTO_CHAIN))) { |
ee538dce | 900 | first_tp = res->goto_tp; |
db50514f JP |
901 | goto reset; |
902 | } | |
87d83093 JP |
903 | #endif |
904 | if (err >= 0) | |
905 | return err; | |
906 | } | |
907 | ||
908 | return TC_ACT_UNSPEC; /* signal: continue lookup */ | |
909 | #ifdef CONFIG_NET_CLS_ACT | |
910 | reset: | |
911 | if (unlikely(limit++ >= max_reclassify_loop)) { | |
9d3aaff3 JP |
912 | net_notice_ratelimited("%u: reclassify loop, rule prio %u, protocol %02x\n", |
913 | tp->chain->block->index, | |
914 | tp->prio & 0xffff, | |
87d83093 JP |
915 | ntohs(tp->protocol)); |
916 | return TC_ACT_SHOT; | |
917 | } | |
918 | ||
ee538dce | 919 | tp = first_tp; |
87d83093 JP |
920 | protocol = tc_skb_protocol(skb); |
921 | goto reclassify; | |
922 | #endif | |
923 | } | |
924 | EXPORT_SYMBOL(tcf_classify); | |
925 | ||
2190d1d0 JP |
926 | struct tcf_chain_info { |
927 | struct tcf_proto __rcu **pprev; | |
928 | struct tcf_proto __rcu *next; | |
929 | }; | |
930 | ||
931 | static struct tcf_proto *tcf_chain_tp_prev(struct tcf_chain_info *chain_info) | |
932 | { | |
933 | return rtnl_dereference(*chain_info->pprev); | |
934 | } | |
935 | ||
936 | static void tcf_chain_tp_insert(struct tcf_chain *chain, | |
937 | struct tcf_chain_info *chain_info, | |
938 | struct tcf_proto *tp) | |
939 | { | |
c7eb7d72 JP |
940 | if (*chain_info->pprev == chain->filter_chain) |
941 | tcf_chain_head_change(chain, tp); | |
2190d1d0 JP |
942 | RCU_INIT_POINTER(tp->next, tcf_chain_tp_prev(chain_info)); |
943 | rcu_assign_pointer(*chain_info->pprev, tp); | |
e2ef7544 | 944 | tcf_chain_hold(chain); |
2190d1d0 JP |
945 | } |
946 | ||
947 | static void tcf_chain_tp_remove(struct tcf_chain *chain, | |
948 | struct tcf_chain_info *chain_info, | |
949 | struct tcf_proto *tp) | |
950 | { | |
951 | struct tcf_proto *next = rtnl_dereference(chain_info->next); | |
952 | ||
c7eb7d72 JP |
953 | if (tp == chain->filter_chain) |
954 | tcf_chain_head_change(chain, next); | |
2190d1d0 | 955 | RCU_INIT_POINTER(*chain_info->pprev, next); |
e2ef7544 | 956 | tcf_chain_put(chain); |
2190d1d0 JP |
957 | } |
958 | ||
959 | static struct tcf_proto *tcf_chain_tp_find(struct tcf_chain *chain, | |
960 | struct tcf_chain_info *chain_info, | |
961 | u32 protocol, u32 prio, | |
962 | bool prio_allocate) | |
963 | { | |
964 | struct tcf_proto **pprev; | |
965 | struct tcf_proto *tp; | |
966 | ||
967 | /* Check the chain for existence of proto-tcf with this priority */ | |
968 | for (pprev = &chain->filter_chain; | |
969 | (tp = rtnl_dereference(*pprev)); pprev = &tp->next) { | |
970 | if (tp->prio >= prio) { | |
971 | if (tp->prio == prio) { | |
972 | if (prio_allocate || | |
973 | (tp->protocol != protocol && protocol)) | |
974 | return ERR_PTR(-EINVAL); | |
975 | } else { | |
976 | tp = NULL; | |
977 | } | |
978 | break; | |
979 | } | |
980 | } | |
981 | chain_info->pprev = pprev; | |
982 | chain_info->next = tp ? tp->next : NULL; | |
983 | return tp; | |
984 | } | |
985 | ||
7120371c | 986 | static int tcf_fill_node(struct net *net, struct sk_buff *skb, |
7960d1da JP |
987 | struct tcf_proto *tp, struct tcf_block *block, |
988 | struct Qdisc *q, u32 parent, void *fh, | |
989 | u32 portid, u32 seq, u16 flags, int event) | |
7120371c WC |
990 | { |
991 | struct tcmsg *tcm; | |
992 | struct nlmsghdr *nlh; | |
993 | unsigned char *b = skb_tail_pointer(skb); | |
994 | ||
995 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags); | |
996 | if (!nlh) | |
997 | goto out_nlmsg_trim; | |
998 | tcm = nlmsg_data(nlh); | |
999 | tcm->tcm_family = AF_UNSPEC; | |
1000 | tcm->tcm__pad1 = 0; | |
1001 | tcm->tcm__pad2 = 0; | |
7960d1da JP |
1002 | if (q) { |
1003 | tcm->tcm_ifindex = qdisc_dev(q)->ifindex; | |
1004 | tcm->tcm_parent = parent; | |
1005 | } else { | |
1006 | tcm->tcm_ifindex = TCM_IFINDEX_MAGIC_BLOCK; | |
1007 | tcm->tcm_block_index = block->index; | |
1008 | } | |
7120371c WC |
1009 | tcm->tcm_info = TC_H_MAKE(tp->prio, tp->protocol); |
1010 | if (nla_put_string(skb, TCA_KIND, tp->ops->kind)) | |
1011 | goto nla_put_failure; | |
1012 | if (nla_put_u32(skb, TCA_CHAIN, tp->chain->index)) | |
1013 | goto nla_put_failure; | |
1014 | if (!fh) { | |
1015 | tcm->tcm_handle = 0; | |
1016 | } else { | |
1017 | if (tp->ops->dump && tp->ops->dump(net, tp, fh, skb, tcm) < 0) | |
1018 | goto nla_put_failure; | |
1019 | } | |
1020 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; | |
1021 | return skb->len; | |
1022 | ||
1023 | out_nlmsg_trim: | |
1024 | nla_put_failure: | |
1025 | nlmsg_trim(skb, b); | |
1026 | return -1; | |
1027 | } | |
1028 | ||
1029 | static int tfilter_notify(struct net *net, struct sk_buff *oskb, | |
1030 | struct nlmsghdr *n, struct tcf_proto *tp, | |
7960d1da JP |
1031 | struct tcf_block *block, struct Qdisc *q, |
1032 | u32 parent, void *fh, int event, bool unicast) | |
7120371c WC |
1033 | { |
1034 | struct sk_buff *skb; | |
1035 | u32 portid = oskb ? NETLINK_CB(oskb).portid : 0; | |
1036 | ||
1037 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
1038 | if (!skb) | |
1039 | return -ENOBUFS; | |
1040 | ||
7960d1da JP |
1041 | if (tcf_fill_node(net, skb, tp, block, q, parent, fh, portid, |
1042 | n->nlmsg_seq, n->nlmsg_flags, event) <= 0) { | |
7120371c WC |
1043 | kfree_skb(skb); |
1044 | return -EINVAL; | |
1045 | } | |
1046 | ||
1047 | if (unicast) | |
1048 | return netlink_unicast(net->rtnl, skb, portid, MSG_DONTWAIT); | |
1049 | ||
1050 | return rtnetlink_send(skb, net, portid, RTNLGRP_TC, | |
1051 | n->nlmsg_flags & NLM_F_ECHO); | |
1052 | } | |
1053 | ||
1054 | static int tfilter_del_notify(struct net *net, struct sk_buff *oskb, | |
1055 | struct nlmsghdr *n, struct tcf_proto *tp, | |
7960d1da | 1056 | struct tcf_block *block, struct Qdisc *q, |
c35a4acc AA |
1057 | u32 parent, void *fh, bool unicast, bool *last, |
1058 | struct netlink_ext_ack *extack) | |
7120371c WC |
1059 | { |
1060 | struct sk_buff *skb; | |
1061 | u32 portid = oskb ? NETLINK_CB(oskb).portid : 0; | |
1062 | int err; | |
1063 | ||
1064 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
1065 | if (!skb) | |
1066 | return -ENOBUFS; | |
1067 | ||
7960d1da JP |
1068 | if (tcf_fill_node(net, skb, tp, block, q, parent, fh, portid, |
1069 | n->nlmsg_seq, n->nlmsg_flags, RTM_DELTFILTER) <= 0) { | |
c35a4acc | 1070 | NL_SET_ERR_MSG(extack, "Failed to build del event notification"); |
7120371c WC |
1071 | kfree_skb(skb); |
1072 | return -EINVAL; | |
1073 | } | |
1074 | ||
571acf21 | 1075 | err = tp->ops->delete(tp, fh, last, extack); |
7120371c WC |
1076 | if (err) { |
1077 | kfree_skb(skb); | |
1078 | return err; | |
1079 | } | |
1080 | ||
1081 | if (unicast) | |
1082 | return netlink_unicast(net->rtnl, skb, portid, MSG_DONTWAIT); | |
1083 | ||
c35a4acc AA |
1084 | err = rtnetlink_send(skb, net, portid, RTNLGRP_TC, |
1085 | n->nlmsg_flags & NLM_F_ECHO); | |
1086 | if (err < 0) | |
1087 | NL_SET_ERR_MSG(extack, "Failed to send filter delete notification"); | |
1088 | return err; | |
7120371c WC |
1089 | } |
1090 | ||
1091 | static void tfilter_notify_chain(struct net *net, struct sk_buff *oskb, | |
7960d1da JP |
1092 | struct tcf_block *block, struct Qdisc *q, |
1093 | u32 parent, struct nlmsghdr *n, | |
7120371c WC |
1094 | struct tcf_chain *chain, int event) |
1095 | { | |
1096 | struct tcf_proto *tp; | |
1097 | ||
1098 | for (tp = rtnl_dereference(chain->filter_chain); | |
1099 | tp; tp = rtnl_dereference(tp->next)) | |
7960d1da | 1100 | tfilter_notify(net, oskb, n, tp, block, |
53189183 | 1101 | q, parent, NULL, event, false); |
7120371c WC |
1102 | } |
1103 | ||
c431f89b | 1104 | static int tc_new_tfilter(struct sk_buff *skb, struct nlmsghdr *n, |
c21ef3e3 | 1105 | struct netlink_ext_ack *extack) |
1da177e4 | 1106 | { |
3b1e0a65 | 1107 | struct net *net = sock_net(skb->sk); |
add93b61 | 1108 | struct nlattr *tca[TCA_MAX + 1]; |
1da177e4 LT |
1109 | struct tcmsg *t; |
1110 | u32 protocol; | |
1111 | u32 prio; | |
9d36d9e5 | 1112 | bool prio_allocate; |
1da177e4 | 1113 | u32 parent; |
5bc17018 | 1114 | u32 chain_index; |
7960d1da | 1115 | struct Qdisc *q = NULL; |
2190d1d0 | 1116 | struct tcf_chain_info chain_info; |
5bc17018 | 1117 | struct tcf_chain *chain = NULL; |
6529eaba | 1118 | struct tcf_block *block; |
1da177e4 | 1119 | struct tcf_proto *tp; |
1da177e4 | 1120 | unsigned long cl; |
8113c095 | 1121 | void *fh; |
1da177e4 | 1122 | int err; |
628185cf | 1123 | int tp_created; |
1da177e4 | 1124 | |
c431f89b | 1125 | if (!netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)) |
dfc47ef8 | 1126 | return -EPERM; |
de179c8c | 1127 | |
1da177e4 | 1128 | replay: |
628185cf DB |
1129 | tp_created = 0; |
1130 | ||
c21ef3e3 | 1131 | err = nlmsg_parse(n, sizeof(*t), tca, TCA_MAX, NULL, extack); |
de179c8c H |
1132 | if (err < 0) |
1133 | return err; | |
1134 | ||
942b8165 | 1135 | t = nlmsg_data(n); |
1da177e4 LT |
1136 | protocol = TC_H_MIN(t->tcm_info); |
1137 | prio = TC_H_MAJ(t->tcm_info); | |
9d36d9e5 | 1138 | prio_allocate = false; |
1da177e4 LT |
1139 | parent = t->tcm_parent; |
1140 | cl = 0; | |
1141 | ||
1142 | if (prio == 0) { | |
c431f89b VB |
1143 | /* If no priority is provided by the user, |
1144 | * we allocate one. | |
1145 | */ | |
1146 | if (n->nlmsg_flags & NLM_F_CREATE) { | |
1147 | prio = TC_H_MAKE(0x80000000U, 0U); | |
1148 | prio_allocate = true; | |
1149 | } else { | |
c35a4acc | 1150 | NL_SET_ERR_MSG(extack, "Invalid filter command with priority of zero"); |
1da177e4 | 1151 | return -ENOENT; |
ea7f8277 | 1152 | } |
1da177e4 LT |
1153 | } |
1154 | ||
1155 | /* Find head of filter chain. */ | |
1156 | ||
c431f89b VB |
1157 | block = tcf_block_find(net, &q, &parent, &cl, |
1158 | t->tcm_ifindex, t->tcm_block_index, extack); | |
1159 | if (IS_ERR(block)) { | |
1160 | err = PTR_ERR(block); | |
1161 | goto errout; | |
6bb16e7a | 1162 | } |
5bc17018 JP |
1163 | |
1164 | chain_index = tca[TCA_CHAIN] ? nla_get_u32(tca[TCA_CHAIN]) : 0; | |
1165 | if (chain_index > TC_ACT_EXT_VAL_MASK) { | |
c35a4acc | 1166 | NL_SET_ERR_MSG(extack, "Specified chain index exceeds upper limit"); |
5bc17018 JP |
1167 | err = -EINVAL; |
1168 | goto errout; | |
1169 | } | |
c431f89b | 1170 | chain = tcf_chain_get(block, chain_index, true); |
5bc17018 | 1171 | if (!chain) { |
c35a4acc | 1172 | NL_SET_ERR_MSG(extack, "Cannot find specified filter chain"); |
c431f89b | 1173 | err = -ENOMEM; |
ea7f8277 DB |
1174 | goto errout; |
1175 | } | |
1da177e4 | 1176 | |
2190d1d0 JP |
1177 | tp = tcf_chain_tp_find(chain, &chain_info, protocol, |
1178 | prio, prio_allocate); | |
1179 | if (IS_ERR(tp)) { | |
c35a4acc | 1180 | NL_SET_ERR_MSG(extack, "Filter with specified priority/protocol not found"); |
2190d1d0 JP |
1181 | err = PTR_ERR(tp); |
1182 | goto errout; | |
1da177e4 LT |
1183 | } |
1184 | ||
1185 | if (tp == NULL) { | |
1186 | /* Proto-tcf does not exist, create new one */ | |
1187 | ||
6bb16e7a | 1188 | if (tca[TCA_KIND] == NULL || !protocol) { |
c35a4acc | 1189 | NL_SET_ERR_MSG(extack, "Filter kind and protocol must be specified"); |
6bb16e7a | 1190 | err = -EINVAL; |
1da177e4 | 1191 | goto errout; |
6bb16e7a | 1192 | } |
1da177e4 | 1193 | |
c431f89b | 1194 | if (!(n->nlmsg_flags & NLM_F_CREATE)) { |
c35a4acc | 1195 | NL_SET_ERR_MSG(extack, "Need both RTM_NEWTFILTER and NLM_F_CREATE to create a new filter"); |
6bb16e7a | 1196 | err = -ENOENT; |
1da177e4 | 1197 | goto errout; |
6bb16e7a | 1198 | } |
1da177e4 | 1199 | |
9d36d9e5 | 1200 | if (prio_allocate) |
2190d1d0 | 1201 | prio = tcf_auto_prio(tcf_chain_tp_prev(&chain_info)); |
1da177e4 | 1202 | |
33a48927 | 1203 | tp = tcf_proto_create(nla_data(tca[TCA_KIND]), |
c35a4acc | 1204 | protocol, prio, chain, extack); |
33a48927 JP |
1205 | if (IS_ERR(tp)) { |
1206 | err = PTR_ERR(tp); | |
1da177e4 LT |
1207 | goto errout; |
1208 | } | |
12186be7 | 1209 | tp_created = 1; |
6bb16e7a | 1210 | } else if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], tp->ops->kind)) { |
c35a4acc | 1211 | NL_SET_ERR_MSG(extack, "Specified filter kind does not match existing one"); |
6bb16e7a | 1212 | err = -EINVAL; |
1da177e4 | 1213 | goto errout; |
6bb16e7a | 1214 | } |
1da177e4 LT |
1215 | |
1216 | fh = tp->ops->get(tp, t->tcm_handle); | |
1217 | ||
8113c095 | 1218 | if (!fh) { |
c431f89b | 1219 | if (!(n->nlmsg_flags & NLM_F_CREATE)) { |
c35a4acc | 1220 | NL_SET_ERR_MSG(extack, "Need both RTM_NEWTFILTER and NLM_F_CREATE to create a new filter"); |
6bb16e7a | 1221 | err = -ENOENT; |
1da177e4 | 1222 | goto errout; |
6bb16e7a | 1223 | } |
c431f89b VB |
1224 | } else if (n->nlmsg_flags & NLM_F_EXCL) { |
1225 | NL_SET_ERR_MSG(extack, "Filter already exists"); | |
1226 | err = -EEXIST; | |
1227 | goto errout; | |
1da177e4 LT |
1228 | } |
1229 | ||
2f7ef2f8 | 1230 | err = tp->ops->change(net, skb, tp, cl, t->tcm_handle, tca, &fh, |
7306db38 AA |
1231 | n->nlmsg_flags & NLM_F_CREATE ? TCA_ACT_NOREPLACE : TCA_ACT_REPLACE, |
1232 | extack); | |
12186be7 | 1233 | if (err == 0) { |
2190d1d0 JP |
1234 | if (tp_created) |
1235 | tcf_chain_tp_insert(chain, &chain_info, tp); | |
7960d1da | 1236 | tfilter_notify(net, skb, n, tp, block, q, parent, fh, |
a10fa201 | 1237 | RTM_NEWTFILTER, false); |
12186be7 MU |
1238 | } else { |
1239 | if (tp_created) | |
715df5ec | 1240 | tcf_proto_destroy(tp, NULL); |
12186be7 | 1241 | } |
1da177e4 LT |
1242 | |
1243 | errout: | |
5bc17018 JP |
1244 | if (chain) |
1245 | tcf_chain_put(chain); | |
1da177e4 LT |
1246 | if (err == -EAGAIN) |
1247 | /* Replay the request. */ | |
1248 | goto replay; | |
1249 | return err; | |
1250 | } | |
1251 | ||
c431f89b VB |
1252 | static int tc_del_tfilter(struct sk_buff *skb, struct nlmsghdr *n, |
1253 | struct netlink_ext_ack *extack) | |
1254 | { | |
1255 | struct net *net = sock_net(skb->sk); | |
1256 | struct nlattr *tca[TCA_MAX + 1]; | |
1257 | struct tcmsg *t; | |
1258 | u32 protocol; | |
1259 | u32 prio; | |
1260 | u32 parent; | |
1261 | u32 chain_index; | |
1262 | struct Qdisc *q = NULL; | |
1263 | struct tcf_chain_info chain_info; | |
1264 | struct tcf_chain *chain = NULL; | |
1265 | struct tcf_block *block; | |
1266 | struct tcf_proto *tp = NULL; | |
1267 | unsigned long cl = 0; | |
1268 | void *fh = NULL; | |
1269 | int err; | |
1270 | ||
1271 | if (!netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)) | |
1272 | return -EPERM; | |
1273 | ||
1274 | err = nlmsg_parse(n, sizeof(*t), tca, TCA_MAX, NULL, extack); | |
1275 | if (err < 0) | |
1276 | return err; | |
1277 | ||
1278 | t = nlmsg_data(n); | |
1279 | protocol = TC_H_MIN(t->tcm_info); | |
1280 | prio = TC_H_MAJ(t->tcm_info); | |
1281 | parent = t->tcm_parent; | |
1282 | ||
1283 | if (prio == 0 && (protocol || t->tcm_handle || tca[TCA_KIND])) { | |
1284 | NL_SET_ERR_MSG(extack, "Cannot flush filters with protocol, handle or kind set"); | |
1285 | return -ENOENT; | |
1286 | } | |
1287 | ||
1288 | /* Find head of filter chain. */ | |
1289 | ||
1290 | block = tcf_block_find(net, &q, &parent, &cl, | |
1291 | t->tcm_ifindex, t->tcm_block_index, extack); | |
1292 | if (IS_ERR(block)) { | |
1293 | err = PTR_ERR(block); | |
1294 | goto errout; | |
1295 | } | |
1296 | ||
1297 | chain_index = tca[TCA_CHAIN] ? nla_get_u32(tca[TCA_CHAIN]) : 0; | |
1298 | if (chain_index > TC_ACT_EXT_VAL_MASK) { | |
1299 | NL_SET_ERR_MSG(extack, "Specified chain index exceeds upper limit"); | |
1300 | err = -EINVAL; | |
1301 | goto errout; | |
1302 | } | |
1303 | chain = tcf_chain_get(block, chain_index, false); | |
1304 | if (!chain) { | |
1305 | NL_SET_ERR_MSG(extack, "Cannot find specified filter chain"); | |
1306 | err = -EINVAL; | |
1307 | goto errout; | |
1308 | } | |
1309 | ||
1310 | if (prio == 0) { | |
1311 | tfilter_notify_chain(net, skb, block, q, parent, n, | |
1312 | chain, RTM_DELTFILTER); | |
1313 | tcf_chain_flush(chain); | |
1314 | err = 0; | |
1315 | goto errout; | |
1316 | } | |
1317 | ||
1318 | tp = tcf_chain_tp_find(chain, &chain_info, protocol, | |
1319 | prio, false); | |
1320 | if (!tp || IS_ERR(tp)) { | |
1321 | NL_SET_ERR_MSG(extack, "Filter with specified priority/protocol not found"); | |
0e399035 | 1322 | err = tp ? PTR_ERR(tp) : -ENOENT; |
c431f89b VB |
1323 | goto errout; |
1324 | } else if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], tp->ops->kind)) { | |
1325 | NL_SET_ERR_MSG(extack, "Specified filter kind does not match existing one"); | |
1326 | err = -EINVAL; | |
1327 | goto errout; | |
1328 | } | |
1329 | ||
1330 | fh = tp->ops->get(tp, t->tcm_handle); | |
1331 | ||
1332 | if (!fh) { | |
1333 | if (t->tcm_handle == 0) { | |
1334 | tcf_chain_tp_remove(chain, &chain_info, tp); | |
1335 | tfilter_notify(net, skb, n, tp, block, q, parent, fh, | |
1336 | RTM_DELTFILTER, false); | |
1337 | tcf_proto_destroy(tp, extack); | |
1338 | err = 0; | |
1339 | } else { | |
1340 | NL_SET_ERR_MSG(extack, "Specified filter handle not found"); | |
1341 | err = -ENOENT; | |
1342 | } | |
1343 | } else { | |
1344 | bool last; | |
1345 | ||
1346 | err = tfilter_del_notify(net, skb, n, tp, block, | |
1347 | q, parent, fh, false, &last, | |
1348 | extack); | |
1349 | if (err) | |
1350 | goto errout; | |
1351 | if (last) { | |
1352 | tcf_chain_tp_remove(chain, &chain_info, tp); | |
1353 | tcf_proto_destroy(tp, extack); | |
1354 | } | |
1355 | } | |
1356 | ||
1357 | errout: | |
1358 | if (chain) | |
1359 | tcf_chain_put(chain); | |
1360 | return err; | |
1361 | } | |
1362 | ||
1363 | static int tc_get_tfilter(struct sk_buff *skb, struct nlmsghdr *n, | |
1364 | struct netlink_ext_ack *extack) | |
1365 | { | |
1366 | struct net *net = sock_net(skb->sk); | |
1367 | struct nlattr *tca[TCA_MAX + 1]; | |
1368 | struct tcmsg *t; | |
1369 | u32 protocol; | |
1370 | u32 prio; | |
1371 | u32 parent; | |
1372 | u32 chain_index; | |
1373 | struct Qdisc *q = NULL; | |
1374 | struct tcf_chain_info chain_info; | |
1375 | struct tcf_chain *chain = NULL; | |
1376 | struct tcf_block *block; | |
1377 | struct tcf_proto *tp = NULL; | |
1378 | unsigned long cl = 0; | |
1379 | void *fh = NULL; | |
1380 | int err; | |
1381 | ||
1382 | err = nlmsg_parse(n, sizeof(*t), tca, TCA_MAX, NULL, extack); | |
1383 | if (err < 0) | |
1384 | return err; | |
1385 | ||
1386 | t = nlmsg_data(n); | |
1387 | protocol = TC_H_MIN(t->tcm_info); | |
1388 | prio = TC_H_MAJ(t->tcm_info); | |
1389 | parent = t->tcm_parent; | |
1390 | ||
1391 | if (prio == 0) { | |
1392 | NL_SET_ERR_MSG(extack, "Invalid filter command with priority of zero"); | |
1393 | return -ENOENT; | |
1394 | } | |
1395 | ||
1396 | /* Find head of filter chain. */ | |
1397 | ||
1398 | block = tcf_block_find(net, &q, &parent, &cl, | |
1399 | t->tcm_ifindex, t->tcm_block_index, extack); | |
1400 | if (IS_ERR(block)) { | |
1401 | err = PTR_ERR(block); | |
1402 | goto errout; | |
1403 | } | |
1404 | ||
1405 | chain_index = tca[TCA_CHAIN] ? nla_get_u32(tca[TCA_CHAIN]) : 0; | |
1406 | if (chain_index > TC_ACT_EXT_VAL_MASK) { | |
1407 | NL_SET_ERR_MSG(extack, "Specified chain index exceeds upper limit"); | |
1408 | err = -EINVAL; | |
1409 | goto errout; | |
1410 | } | |
1411 | chain = tcf_chain_get(block, chain_index, false); | |
1412 | if (!chain) { | |
1413 | NL_SET_ERR_MSG(extack, "Cannot find specified filter chain"); | |
1414 | err = -EINVAL; | |
1415 | goto errout; | |
1416 | } | |
1417 | ||
1418 | tp = tcf_chain_tp_find(chain, &chain_info, protocol, | |
1419 | prio, false); | |
1420 | if (!tp || IS_ERR(tp)) { | |
1421 | NL_SET_ERR_MSG(extack, "Filter with specified priority/protocol not found"); | |
0e399035 | 1422 | err = tp ? PTR_ERR(tp) : -ENOENT; |
c431f89b VB |
1423 | goto errout; |
1424 | } else if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], tp->ops->kind)) { | |
1425 | NL_SET_ERR_MSG(extack, "Specified filter kind does not match existing one"); | |
1426 | err = -EINVAL; | |
1427 | goto errout; | |
1428 | } | |
1429 | ||
1430 | fh = tp->ops->get(tp, t->tcm_handle); | |
1431 | ||
1432 | if (!fh) { | |
1433 | NL_SET_ERR_MSG(extack, "Specified filter handle not found"); | |
1434 | err = -ENOENT; | |
1435 | } else { | |
1436 | err = tfilter_notify(net, skb, n, tp, block, q, parent, | |
1437 | fh, RTM_NEWTFILTER, true); | |
1438 | if (err < 0) | |
1439 | NL_SET_ERR_MSG(extack, "Failed to send filter notify message"); | |
1440 | } | |
1441 | ||
1442 | errout: | |
1443 | if (chain) | |
1444 | tcf_chain_put(chain); | |
1445 | return err; | |
1446 | } | |
1447 | ||
aa767bfe | 1448 | struct tcf_dump_args { |
1da177e4 LT |
1449 | struct tcf_walker w; |
1450 | struct sk_buff *skb; | |
1451 | struct netlink_callback *cb; | |
7960d1da | 1452 | struct tcf_block *block; |
a10fa201 JP |
1453 | struct Qdisc *q; |
1454 | u32 parent; | |
1da177e4 LT |
1455 | }; |
1456 | ||
8113c095 | 1457 | static int tcf_node_dump(struct tcf_proto *tp, void *n, struct tcf_walker *arg) |
1da177e4 | 1458 | { |
aa767bfe | 1459 | struct tcf_dump_args *a = (void *)arg; |
832d1d5b | 1460 | struct net *net = sock_net(a->skb->sk); |
1da177e4 | 1461 | |
7960d1da | 1462 | return tcf_fill_node(net, a->skb, tp, a->block, a->q, a->parent, |
a10fa201 | 1463 | n, NETLINK_CB(a->cb->skb).portid, |
5a7a5555 JHS |
1464 | a->cb->nlh->nlmsg_seq, NLM_F_MULTI, |
1465 | RTM_NEWTFILTER); | |
1da177e4 LT |
1466 | } |
1467 | ||
a10fa201 JP |
1468 | static bool tcf_chain_dump(struct tcf_chain *chain, struct Qdisc *q, u32 parent, |
1469 | struct sk_buff *skb, struct netlink_callback *cb, | |
acb31fae JP |
1470 | long index_start, long *p_index) |
1471 | { | |
1472 | struct net *net = sock_net(skb->sk); | |
7960d1da | 1473 | struct tcf_block *block = chain->block; |
acb31fae JP |
1474 | struct tcmsg *tcm = nlmsg_data(cb->nlh); |
1475 | struct tcf_dump_args arg; | |
1476 | struct tcf_proto *tp; | |
1477 | ||
1478 | for (tp = rtnl_dereference(chain->filter_chain); | |
1479 | tp; tp = rtnl_dereference(tp->next), (*p_index)++) { | |
1480 | if (*p_index < index_start) | |
1481 | continue; | |
1482 | if (TC_H_MAJ(tcm->tcm_info) && | |
1483 | TC_H_MAJ(tcm->tcm_info) != tp->prio) | |
1484 | continue; | |
1485 | if (TC_H_MIN(tcm->tcm_info) && | |
1486 | TC_H_MIN(tcm->tcm_info) != tp->protocol) | |
1487 | continue; | |
1488 | if (*p_index > index_start) | |
1489 | memset(&cb->args[1], 0, | |
1490 | sizeof(cb->args) - sizeof(cb->args[0])); | |
1491 | if (cb->args[1] == 0) { | |
53189183 | 1492 | if (tcf_fill_node(net, skb, tp, block, q, parent, NULL, |
acb31fae JP |
1493 | NETLINK_CB(cb->skb).portid, |
1494 | cb->nlh->nlmsg_seq, NLM_F_MULTI, | |
1495 | RTM_NEWTFILTER) <= 0) | |
5bc17018 | 1496 | return false; |
acb31fae JP |
1497 | |
1498 | cb->args[1] = 1; | |
1499 | } | |
1500 | if (!tp->ops->walk) | |
1501 | continue; | |
1502 | arg.w.fn = tcf_node_dump; | |
1503 | arg.skb = skb; | |
1504 | arg.cb = cb; | |
7960d1da | 1505 | arg.block = block; |
a10fa201 JP |
1506 | arg.q = q; |
1507 | arg.parent = parent; | |
acb31fae JP |
1508 | arg.w.stop = 0; |
1509 | arg.w.skip = cb->args[1] - 1; | |
1510 | arg.w.count = 0; | |
01683a14 | 1511 | arg.w.cookie = cb->args[2]; |
acb31fae | 1512 | tp->ops->walk(tp, &arg.w); |
01683a14 | 1513 | cb->args[2] = arg.w.cookie; |
acb31fae JP |
1514 | cb->args[1] = arg.w.count + 1; |
1515 | if (arg.w.stop) | |
5bc17018 | 1516 | return false; |
acb31fae | 1517 | } |
5bc17018 | 1518 | return true; |
acb31fae JP |
1519 | } |
1520 | ||
bd27a875 | 1521 | /* called with RTNL */ |
1da177e4 LT |
1522 | static int tc_dump_tfilter(struct sk_buff *skb, struct netlink_callback *cb) |
1523 | { | |
3b1e0a65 | 1524 | struct net *net = sock_net(skb->sk); |
5bc17018 | 1525 | struct nlattr *tca[TCA_MAX + 1]; |
7960d1da | 1526 | struct Qdisc *q = NULL; |
6529eaba | 1527 | struct tcf_block *block; |
2190d1d0 | 1528 | struct tcf_chain *chain; |
942b8165 | 1529 | struct tcmsg *tcm = nlmsg_data(cb->nlh); |
acb31fae JP |
1530 | long index_start; |
1531 | long index; | |
a10fa201 | 1532 | u32 parent; |
5bc17018 | 1533 | int err; |
1da177e4 | 1534 | |
573ce260 | 1535 | if (nlmsg_len(cb->nlh) < sizeof(*tcm)) |
1da177e4 | 1536 | return skb->len; |
5bc17018 JP |
1537 | |
1538 | err = nlmsg_parse(cb->nlh, sizeof(*tcm), tca, TCA_MAX, NULL, NULL); | |
1539 | if (err) | |
1540 | return err; | |
1541 | ||
7960d1da JP |
1542 | if (tcm->tcm_ifindex == TCM_IFINDEX_MAGIC_BLOCK) { |
1543 | block = tcf_block_lookup(net, tcm->tcm_block_index); | |
1544 | if (!block) | |
1545 | goto out; | |
d680b352 JP |
1546 | /* If we work with block index, q is NULL and parent value |
1547 | * will never be used in the following code. The check | |
1548 | * in tcf_fill_node prevents it. However, compiler does not | |
1549 | * see that far, so set parent to zero to silence the warning | |
1550 | * about parent being uninitialized. | |
1551 | */ | |
1552 | parent = 0; | |
a10fa201 | 1553 | } else { |
7960d1da JP |
1554 | const struct Qdisc_class_ops *cops; |
1555 | struct net_device *dev; | |
1556 | unsigned long cl = 0; | |
1557 | ||
1558 | dev = __dev_get_by_index(net, tcm->tcm_ifindex); | |
1559 | if (!dev) | |
1560 | return skb->len; | |
1561 | ||
1562 | parent = tcm->tcm_parent; | |
1563 | if (!parent) { | |
1564 | q = dev->qdisc; | |
1565 | parent = q->handle; | |
1566 | } else { | |
1567 | q = qdisc_lookup(dev, TC_H_MAJ(tcm->tcm_parent)); | |
1568 | } | |
1569 | if (!q) | |
1570 | goto out; | |
1571 | cops = q->ops->cl_ops; | |
1572 | if (!cops) | |
143976ce | 1573 | goto out; |
7960d1da JP |
1574 | if (!cops->tcf_block) |
1575 | goto out; | |
1576 | if (TC_H_MIN(tcm->tcm_parent)) { | |
1577 | cl = cops->find(q, tcm->tcm_parent); | |
1578 | if (cl == 0) | |
1579 | goto out; | |
1580 | } | |
1581 | block = cops->tcf_block(q, cl, NULL); | |
1582 | if (!block) | |
1583 | goto out; | |
1584 | if (tcf_block_shared(block)) | |
1585 | q = NULL; | |
1da177e4 | 1586 | } |
1da177e4 | 1587 | |
acb31fae JP |
1588 | index_start = cb->args[0]; |
1589 | index = 0; | |
5bc17018 JP |
1590 | |
1591 | list_for_each_entry(chain, &block->chain_list, list) { | |
1592 | if (tca[TCA_CHAIN] && | |
1593 | nla_get_u32(tca[TCA_CHAIN]) != chain->index) | |
1594 | continue; | |
a10fa201 | 1595 | if (!tcf_chain_dump(chain, q, parent, skb, cb, |
5ae437ad RK |
1596 | index_start, &index)) { |
1597 | err = -EMSGSIZE; | |
5bc17018 | 1598 | break; |
5ae437ad | 1599 | } |
5bc17018 JP |
1600 | } |
1601 | ||
acb31fae | 1602 | cb->args[0] = index; |
1da177e4 | 1603 | |
1da177e4 | 1604 | out: |
5ae437ad RK |
1605 | /* If we did no progress, the error (EMSGSIZE) is real */ |
1606 | if (skb->len == 0 && err) | |
1607 | return err; | |
1da177e4 LT |
1608 | return skb->len; |
1609 | } | |
1610 | ||
18d0264f | 1611 | void tcf_exts_destroy(struct tcf_exts *exts) |
1da177e4 LT |
1612 | { |
1613 | #ifdef CONFIG_NET_CLS_ACT | |
90b73b77 | 1614 | tcf_action_destroy(exts->actions, TCA_ACT_UNBIND); |
22dc13c8 WC |
1615 | kfree(exts->actions); |
1616 | exts->nr_actions = 0; | |
1da177e4 LT |
1617 | #endif |
1618 | } | |
aa767bfe | 1619 | EXPORT_SYMBOL(tcf_exts_destroy); |
1da177e4 | 1620 | |
c1b52739 | 1621 | int tcf_exts_validate(struct net *net, struct tcf_proto *tp, struct nlattr **tb, |
50a56190 AA |
1622 | struct nlattr *rate_tlv, struct tcf_exts *exts, bool ovr, |
1623 | struct netlink_ext_ack *extack) | |
1da177e4 | 1624 | { |
1da177e4 LT |
1625 | #ifdef CONFIG_NET_CLS_ACT |
1626 | { | |
1da177e4 | 1627 | struct tc_action *act; |
d04e6990 | 1628 | size_t attr_size = 0; |
1da177e4 | 1629 | |
5da57f42 | 1630 | if (exts->police && tb[exts->police]) { |
9fb9f251 JP |
1631 | act = tcf_action_init_1(net, tp, tb[exts->police], |
1632 | rate_tlv, "police", ovr, | |
789871bb | 1633 | TCA_ACT_BIND, true, extack); |
ab27cfb8 PM |
1634 | if (IS_ERR(act)) |
1635 | return PTR_ERR(act); | |
1da177e4 | 1636 | |
33be6271 | 1637 | act->type = exts->type = TCA_OLD_COMPAT; |
22dc13c8 WC |
1638 | exts->actions[0] = act; |
1639 | exts->nr_actions = 1; | |
5da57f42 | 1640 | } else if (exts->action && tb[exts->action]) { |
90b73b77 | 1641 | int err; |
22dc13c8 | 1642 | |
9fb9f251 JP |
1643 | err = tcf_action_init(net, tp, tb[exts->action], |
1644 | rate_tlv, NULL, ovr, TCA_ACT_BIND, | |
90b73b77 | 1645 | exts->actions, &attr_size, true, |
789871bb | 1646 | extack); |
90b73b77 | 1647 | if (err < 0) |
33be6271 | 1648 | return err; |
90b73b77 | 1649 | exts->nr_actions = err; |
1da177e4 | 1650 | } |
e4b95c41 | 1651 | exts->net = net; |
1da177e4 | 1652 | } |
1da177e4 | 1653 | #else |
5da57f42 | 1654 | if ((exts->action && tb[exts->action]) || |
50a56190 AA |
1655 | (exts->police && tb[exts->police])) { |
1656 | NL_SET_ERR_MSG(extack, "Classifier actions are not supported per compile options (CONFIG_NET_CLS_ACT)"); | |
1da177e4 | 1657 | return -EOPNOTSUPP; |
50a56190 | 1658 | } |
1da177e4 LT |
1659 | #endif |
1660 | ||
1661 | return 0; | |
1662 | } | |
aa767bfe | 1663 | EXPORT_SYMBOL(tcf_exts_validate); |
1da177e4 | 1664 | |
9b0d4446 | 1665 | void tcf_exts_change(struct tcf_exts *dst, struct tcf_exts *src) |
1da177e4 LT |
1666 | { |
1667 | #ifdef CONFIG_NET_CLS_ACT | |
22dc13c8 WC |
1668 | struct tcf_exts old = *dst; |
1669 | ||
9b0d4446 | 1670 | *dst = *src; |
22dc13c8 | 1671 | tcf_exts_destroy(&old); |
1da177e4 LT |
1672 | #endif |
1673 | } | |
aa767bfe | 1674 | EXPORT_SYMBOL(tcf_exts_change); |
1da177e4 | 1675 | |
22dc13c8 WC |
1676 | #ifdef CONFIG_NET_CLS_ACT |
1677 | static struct tc_action *tcf_exts_first_act(struct tcf_exts *exts) | |
1678 | { | |
1679 | if (exts->nr_actions == 0) | |
1680 | return NULL; | |
1681 | else | |
1682 | return exts->actions[0]; | |
1683 | } | |
1684 | #endif | |
33be6271 | 1685 | |
5da57f42 | 1686 | int tcf_exts_dump(struct sk_buff *skb, struct tcf_exts *exts) |
1da177e4 LT |
1687 | { |
1688 | #ifdef CONFIG_NET_CLS_ACT | |
9cc63db5 CW |
1689 | struct nlattr *nest; |
1690 | ||
978dfd8d | 1691 | if (exts->action && tcf_exts_has_actions(exts)) { |
1da177e4 LT |
1692 | /* |
1693 | * again for backward compatible mode - we want | |
1694 | * to work with both old and new modes of entering | |
1695 | * tc data even if iproute2 was newer - jhs | |
1696 | */ | |
33be6271 | 1697 | if (exts->type != TCA_OLD_COMPAT) { |
5da57f42 | 1698 | nest = nla_nest_start(skb, exts->action); |
4b3550ef PM |
1699 | if (nest == NULL) |
1700 | goto nla_put_failure; | |
22dc13c8 | 1701 | |
90b73b77 | 1702 | if (tcf_action_dump(skb, exts->actions, 0, 0) < 0) |
add93b61 | 1703 | goto nla_put_failure; |
4b3550ef | 1704 | nla_nest_end(skb, nest); |
5da57f42 | 1705 | } else if (exts->police) { |
33be6271 | 1706 | struct tc_action *act = tcf_exts_first_act(exts); |
5da57f42 | 1707 | nest = nla_nest_start(skb, exts->police); |
63acd680 | 1708 | if (nest == NULL || !act) |
4b3550ef | 1709 | goto nla_put_failure; |
33be6271 | 1710 | if (tcf_action_dump_old(skb, act, 0, 0) < 0) |
add93b61 | 1711 | goto nla_put_failure; |
4b3550ef | 1712 | nla_nest_end(skb, nest); |
1da177e4 LT |
1713 | } |
1714 | } | |
1da177e4 | 1715 | return 0; |
9cc63db5 CW |
1716 | |
1717 | nla_put_failure: | |
1718 | nla_nest_cancel(skb, nest); | |
1da177e4 | 1719 | return -1; |
9cc63db5 CW |
1720 | #else |
1721 | return 0; | |
1722 | #endif | |
1da177e4 | 1723 | } |
aa767bfe | 1724 | EXPORT_SYMBOL(tcf_exts_dump); |
1da177e4 | 1725 | |
aa767bfe | 1726 | |
5da57f42 | 1727 | int tcf_exts_dump_stats(struct sk_buff *skb, struct tcf_exts *exts) |
1da177e4 LT |
1728 | { |
1729 | #ifdef CONFIG_NET_CLS_ACT | |
33be6271 | 1730 | struct tc_action *a = tcf_exts_first_act(exts); |
b057df24 | 1731 | if (a != NULL && tcf_action_copy_stats(skb, a, 1) < 0) |
33be6271 | 1732 | return -1; |
1da177e4 LT |
1733 | #endif |
1734 | return 0; | |
1da177e4 | 1735 | } |
aa767bfe | 1736 | EXPORT_SYMBOL(tcf_exts_dump_stats); |
1da177e4 | 1737 | |
717503b9 JP |
1738 | static int tc_exts_setup_cb_egdev_call(struct tcf_exts *exts, |
1739 | enum tc_setup_type type, | |
1740 | void *type_data, bool err_stop) | |
b3f55bdd JP |
1741 | { |
1742 | int ok_count = 0; | |
1743 | #ifdef CONFIG_NET_CLS_ACT | |
1744 | const struct tc_action *a; | |
1745 | struct net_device *dev; | |
9d452ceb | 1746 | int i, ret; |
b3f55bdd JP |
1747 | |
1748 | if (!tcf_exts_has_actions(exts)) | |
1749 | return 0; | |
1750 | ||
9d452ceb OG |
1751 | for (i = 0; i < exts->nr_actions; i++) { |
1752 | a = exts->actions[i]; | |
b3f55bdd JP |
1753 | if (!a->ops->get_dev) |
1754 | continue; | |
1755 | dev = a->ops->get_dev(a); | |
7612fb03 | 1756 | if (!dev) |
b3f55bdd JP |
1757 | continue; |
1758 | ret = tc_setup_cb_egdev_call(dev, type, type_data, err_stop); | |
1759 | if (ret < 0) | |
1760 | return ret; | |
1761 | ok_count += ret; | |
1762 | } | |
1763 | #endif | |
1764 | return ok_count; | |
1765 | } | |
717503b9 | 1766 | |
208c0f4b JP |
1767 | int tc_setup_cb_call(struct tcf_block *block, struct tcf_exts *exts, |
1768 | enum tc_setup_type type, void *type_data, bool err_stop) | |
717503b9 | 1769 | { |
9a99dc1c | 1770 | int ok_count; |
208c0f4b JP |
1771 | int ret; |
1772 | ||
9a99dc1c DM |
1773 | ret = tcf_block_cb_call(block, type, type_data, err_stop); |
1774 | if (ret < 0) | |
1775 | return ret; | |
1776 | ok_count = ret; | |
208c0f4b | 1777 | |
f8f4bef3 | 1778 | if (!exts || ok_count) |
9a99dc1c | 1779 | return ok_count; |
208c0f4b JP |
1780 | ret = tc_exts_setup_cb_egdev_call(exts, type, type_data, err_stop); |
1781 | if (ret < 0) | |
1782 | return ret; | |
1783 | ok_count += ret; | |
1784 | ||
1785 | return ok_count; | |
717503b9 JP |
1786 | } |
1787 | EXPORT_SYMBOL(tc_setup_cb_call); | |
b3f55bdd | 1788 | |
48617387 JP |
1789 | static __net_init int tcf_net_init(struct net *net) |
1790 | { | |
1791 | struct tcf_net *tn = net_generic(net, tcf_net_id); | |
1792 | ||
1793 | idr_init(&tn->idr); | |
1794 | return 0; | |
1795 | } | |
1796 | ||
1797 | static void __net_exit tcf_net_exit(struct net *net) | |
1798 | { | |
1799 | struct tcf_net *tn = net_generic(net, tcf_net_id); | |
1800 | ||
1801 | idr_destroy(&tn->idr); | |
1802 | } | |
1803 | ||
1804 | static struct pernet_operations tcf_net_ops = { | |
1805 | .init = tcf_net_init, | |
1806 | .exit = tcf_net_exit, | |
1807 | .id = &tcf_net_id, | |
1808 | .size = sizeof(struct tcf_net), | |
1809 | }; | |
1810 | ||
1da177e4 LT |
1811 | static int __init tc_filter_init(void) |
1812 | { | |
48617387 JP |
1813 | int err; |
1814 | ||
7aa0045d CW |
1815 | tc_filter_wq = alloc_ordered_workqueue("tc_filter_workqueue", 0); |
1816 | if (!tc_filter_wq) | |
1817 | return -ENOMEM; | |
1818 | ||
48617387 JP |
1819 | err = register_pernet_subsys(&tcf_net_ops); |
1820 | if (err) | |
1821 | goto err_register_pernet_subsys; | |
1822 | ||
c431f89b VB |
1823 | rtnl_register(PF_UNSPEC, RTM_NEWTFILTER, tc_new_tfilter, NULL, 0); |
1824 | rtnl_register(PF_UNSPEC, RTM_DELTFILTER, tc_del_tfilter, NULL, 0); | |
1825 | rtnl_register(PF_UNSPEC, RTM_GETTFILTER, tc_get_tfilter, | |
b97bac64 | 1826 | tc_dump_tfilter, 0); |
1da177e4 | 1827 | |
1da177e4 | 1828 | return 0; |
48617387 JP |
1829 | |
1830 | err_register_pernet_subsys: | |
1831 | destroy_workqueue(tc_filter_wq); | |
1832 | return err; | |
1da177e4 LT |
1833 | } |
1834 | ||
1835 | subsys_initcall(tc_filter_init); |