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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 | ||
f34e8bff | 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 | ||
f34e8bff JP |
60 | static const struct tcf_proto_ops * |
61 | tcf_proto_lookup_ops(const char *kind, struct netlink_ext_ack *extack) | |
62 | { | |
63 | const struct tcf_proto_ops *ops; | |
64 | ||
65 | ops = __tcf_proto_lookup_ops(kind); | |
66 | if (ops) | |
67 | return ops; | |
68 | #ifdef CONFIG_MODULES | |
69 | rtnl_unlock(); | |
70 | request_module("cls_%s", kind); | |
71 | rtnl_lock(); | |
72 | ops = __tcf_proto_lookup_ops(kind); | |
73 | /* We dropped the RTNL semaphore in order to perform | |
74 | * the module load. So, even if we succeeded in loading | |
75 | * the module we have to replay the request. We indicate | |
76 | * this using -EAGAIN. | |
77 | */ | |
78 | if (ops) { | |
79 | module_put(ops->owner); | |
80 | return ERR_PTR(-EAGAIN); | |
81 | } | |
82 | #endif | |
83 | NL_SET_ERR_MSG(extack, "TC classifier not found"); | |
84 | return ERR_PTR(-ENOENT); | |
85 | } | |
86 | ||
1da177e4 LT |
87 | /* Register(unregister) new classifier type */ |
88 | ||
89 | int register_tcf_proto_ops(struct tcf_proto_ops *ops) | |
90 | { | |
36272874 | 91 | struct tcf_proto_ops *t; |
1da177e4 LT |
92 | int rc = -EEXIST; |
93 | ||
94 | write_lock(&cls_mod_lock); | |
36272874 | 95 | list_for_each_entry(t, &tcf_proto_base, head) |
1da177e4 LT |
96 | if (!strcmp(ops->kind, t->kind)) |
97 | goto out; | |
98 | ||
36272874 | 99 | list_add_tail(&ops->head, &tcf_proto_base); |
1da177e4 LT |
100 | rc = 0; |
101 | out: | |
102 | write_unlock(&cls_mod_lock); | |
103 | return rc; | |
104 | } | |
aa767bfe | 105 | EXPORT_SYMBOL(register_tcf_proto_ops); |
1da177e4 | 106 | |
7aa0045d CW |
107 | static struct workqueue_struct *tc_filter_wq; |
108 | ||
1da177e4 LT |
109 | int unregister_tcf_proto_ops(struct tcf_proto_ops *ops) |
110 | { | |
36272874 | 111 | struct tcf_proto_ops *t; |
1da177e4 LT |
112 | int rc = -ENOENT; |
113 | ||
c78e1746 DB |
114 | /* Wait for outstanding call_rcu()s, if any, from a |
115 | * tcf_proto_ops's destroy() handler. | |
116 | */ | |
117 | rcu_barrier(); | |
7aa0045d | 118 | flush_workqueue(tc_filter_wq); |
c78e1746 | 119 | |
1da177e4 | 120 | write_lock(&cls_mod_lock); |
dcd76081 ED |
121 | list_for_each_entry(t, &tcf_proto_base, head) { |
122 | if (t == ops) { | |
123 | list_del(&t->head); | |
124 | rc = 0; | |
1da177e4 | 125 | break; |
dcd76081 ED |
126 | } |
127 | } | |
1da177e4 LT |
128 | write_unlock(&cls_mod_lock); |
129 | return rc; | |
130 | } | |
aa767bfe | 131 | EXPORT_SYMBOL(unregister_tcf_proto_ops); |
1da177e4 | 132 | |
aaa908ff | 133 | bool tcf_queue_work(struct rcu_work *rwork, work_func_t func) |
7aa0045d | 134 | { |
aaa908ff CW |
135 | INIT_RCU_WORK(rwork, func); |
136 | return queue_rcu_work(tc_filter_wq, rwork); | |
7aa0045d CW |
137 | } |
138 | EXPORT_SYMBOL(tcf_queue_work); | |
139 | ||
1da177e4 LT |
140 | /* Select new prio value from the range, managed by kernel. */ |
141 | ||
aa767bfe | 142 | static inline u32 tcf_auto_prio(struct tcf_proto *tp) |
1da177e4 | 143 | { |
aa767bfe | 144 | u32 first = TC_H_MAKE(0xC0000000U, 0U); |
1da177e4 LT |
145 | |
146 | if (tp) | |
cc7ec456 | 147 | first = tp->prio - 1; |
1da177e4 | 148 | |
7961973a | 149 | return TC_H_MAJ(first); |
1da177e4 LT |
150 | } |
151 | ||
33a48927 | 152 | static struct tcf_proto *tcf_proto_create(const char *kind, u32 protocol, |
c35a4acc AA |
153 | u32 prio, struct tcf_chain *chain, |
154 | struct netlink_ext_ack *extack) | |
33a48927 JP |
155 | { |
156 | struct tcf_proto *tp; | |
157 | int err; | |
158 | ||
159 | tp = kzalloc(sizeof(*tp), GFP_KERNEL); | |
160 | if (!tp) | |
161 | return ERR_PTR(-ENOBUFS); | |
162 | ||
f34e8bff JP |
163 | tp->ops = tcf_proto_lookup_ops(kind, extack); |
164 | if (IS_ERR(tp->ops)) { | |
165 | err = PTR_ERR(tp->ops); | |
d68d75fd | 166 | goto errout; |
33a48927 JP |
167 | } |
168 | tp->classify = tp->ops->classify; | |
169 | tp->protocol = protocol; | |
170 | tp->prio = prio; | |
5bc17018 | 171 | tp->chain = chain; |
33a48927 JP |
172 | |
173 | err = tp->ops->init(tp); | |
174 | if (err) { | |
175 | module_put(tp->ops->owner); | |
176 | goto errout; | |
177 | } | |
178 | return tp; | |
179 | ||
180 | errout: | |
181 | kfree(tp); | |
182 | return ERR_PTR(err); | |
183 | } | |
184 | ||
715df5ec JK |
185 | static void tcf_proto_destroy(struct tcf_proto *tp, |
186 | struct netlink_ext_ack *extack) | |
cf1facda | 187 | { |
715df5ec | 188 | tp->ops->destroy(tp, extack); |
763dbf63 WC |
189 | module_put(tp->ops->owner); |
190 | kfree_rcu(tp, rcu); | |
cf1facda JP |
191 | } |
192 | ||
a9b19443 JP |
193 | struct tcf_filter_chain_list_item { |
194 | struct list_head list; | |
195 | tcf_chain_head_change_t *chain_head_change; | |
196 | void *chain_head_change_priv; | |
197 | }; | |
198 | ||
5bc17018 JP |
199 | static struct tcf_chain *tcf_chain_create(struct tcf_block *block, |
200 | u32 chain_index) | |
2190d1d0 | 201 | { |
5bc17018 JP |
202 | struct tcf_chain *chain; |
203 | ||
204 | chain = kzalloc(sizeof(*chain), GFP_KERNEL); | |
205 | if (!chain) | |
206 | return NULL; | |
207 | list_add_tail(&chain->list, &block->chain_list); | |
208 | chain->block = block; | |
209 | chain->index = chain_index; | |
e2ef7544 | 210 | chain->refcnt = 1; |
f71e0ca4 JP |
211 | if (!chain->index) |
212 | block->chain0.chain = chain; | |
5bc17018 | 213 | return chain; |
2190d1d0 JP |
214 | } |
215 | ||
a9b19443 JP |
216 | static void tcf_chain_head_change_item(struct tcf_filter_chain_list_item *item, |
217 | struct tcf_proto *tp_head) | |
218 | { | |
219 | if (item->chain_head_change) | |
220 | item->chain_head_change(tp_head, item->chain_head_change_priv); | |
221 | } | |
f71e0ca4 JP |
222 | |
223 | static void tcf_chain0_head_change(struct tcf_chain *chain, | |
224 | struct tcf_proto *tp_head) | |
c7eb7d72 | 225 | { |
a9b19443 | 226 | struct tcf_filter_chain_list_item *item; |
f71e0ca4 | 227 | struct tcf_block *block = chain->block; |
a9b19443 | 228 | |
f71e0ca4 JP |
229 | if (chain->index) |
230 | return; | |
231 | list_for_each_entry(item, &block->chain0.filter_chain_list, list) | |
a9b19443 | 232 | tcf_chain_head_change_item(item, tp_head); |
c7eb7d72 JP |
233 | } |
234 | ||
f93e1cdc JP |
235 | static void tcf_chain_destroy(struct tcf_chain *chain) |
236 | { | |
efbf7897 CW |
237 | struct tcf_block *block = chain->block; |
238 | ||
e2ef7544 | 239 | list_del(&chain->list); |
f71e0ca4 JP |
240 | if (!chain->index) |
241 | block->chain0.chain = NULL; | |
e2ef7544 | 242 | kfree(chain); |
cfebd7e2 | 243 | if (list_empty(&block->chain_list) && !refcount_read(&block->refcnt)) |
0607e439 | 244 | kfree_rcu(block, rcu); |
e2ef7544 | 245 | } |
744a4cf6 | 246 | |
e2ef7544 CW |
247 | static void tcf_chain_hold(struct tcf_chain *chain) |
248 | { | |
249 | ++chain->refcnt; | |
2190d1d0 JP |
250 | } |
251 | ||
3d32f4c5 | 252 | static bool tcf_chain_held_by_acts_only(struct tcf_chain *chain) |
1f3ed383 JP |
253 | { |
254 | /* In case all the references are action references, this | |
3d32f4c5 | 255 | * chain should not be shown to the user. |
1f3ed383 JP |
256 | */ |
257 | return chain->refcnt == chain->action_refcnt; | |
258 | } | |
259 | ||
32a4f5ec JP |
260 | static struct tcf_chain *tcf_chain_lookup(struct tcf_block *block, |
261 | u32 chain_index) | |
5bc17018 JP |
262 | { |
263 | struct tcf_chain *chain; | |
264 | ||
265 | list_for_each_entry(chain, &block->chain_list, list) { | |
32a4f5ec | 266 | if (chain->index == chain_index) |
e2ef7544 | 267 | return chain; |
32a4f5ec JP |
268 | } |
269 | return NULL; | |
270 | } | |
271 | ||
272 | static int tc_chain_notify(struct tcf_chain *chain, struct sk_buff *oskb, | |
273 | u32 seq, u16 flags, int event, bool unicast); | |
274 | ||
53681407 JP |
275 | static struct tcf_chain *__tcf_chain_get(struct tcf_block *block, |
276 | u32 chain_index, bool create, | |
277 | bool by_act) | |
32a4f5ec JP |
278 | { |
279 | struct tcf_chain *chain = tcf_chain_lookup(block, chain_index); | |
280 | ||
281 | if (chain) { | |
282 | tcf_chain_hold(chain); | |
53681407 JP |
283 | } else { |
284 | if (!create) | |
285 | return NULL; | |
286 | chain = tcf_chain_create(block, chain_index); | |
287 | if (!chain) | |
288 | return NULL; | |
5bc17018 | 289 | } |
80532384 | 290 | |
53681407 JP |
291 | if (by_act) |
292 | ++chain->action_refcnt; | |
293 | ||
294 | /* Send notification only in case we got the first | |
295 | * non-action reference. Until then, the chain acts only as | |
296 | * a placeholder for actions pointing to it and user ought | |
297 | * not know about them. | |
298 | */ | |
299 | if (chain->refcnt - chain->action_refcnt == 1 && !by_act) | |
300 | tc_chain_notify(chain, NULL, 0, NLM_F_CREATE | NLM_F_EXCL, | |
301 | RTM_NEWCHAIN, false); | |
302 | ||
32a4f5ec | 303 | return chain; |
5bc17018 | 304 | } |
53681407 | 305 | |
290b1c8b JP |
306 | static struct tcf_chain *tcf_chain_get(struct tcf_block *block, u32 chain_index, |
307 | bool create) | |
53681407 JP |
308 | { |
309 | return __tcf_chain_get(block, chain_index, create, false); | |
310 | } | |
5bc17018 | 311 | |
1f3ed383 JP |
312 | struct tcf_chain *tcf_chain_get_by_act(struct tcf_block *block, u32 chain_index) |
313 | { | |
53681407 | 314 | return __tcf_chain_get(block, chain_index, true, true); |
1f3ed383 JP |
315 | } |
316 | EXPORT_SYMBOL(tcf_chain_get_by_act); | |
317 | ||
9f407f17 JP |
318 | static void tc_chain_tmplt_del(struct tcf_chain *chain); |
319 | ||
53681407 | 320 | static void __tcf_chain_put(struct tcf_chain *chain, bool by_act) |
5bc17018 | 321 | { |
53681407 JP |
322 | if (by_act) |
323 | chain->action_refcnt--; | |
324 | chain->refcnt--; | |
325 | ||
326 | /* The last dropped non-action reference will trigger notification. */ | |
327 | if (chain->refcnt - chain->action_refcnt == 0 && !by_act) | |
32a4f5ec | 328 | tc_chain_notify(chain, NULL, 0, 0, RTM_DELCHAIN, false); |
53681407 JP |
329 | |
330 | if (chain->refcnt == 0) { | |
9f407f17 | 331 | tc_chain_tmplt_del(chain); |
5bc17018 | 332 | tcf_chain_destroy(chain); |
32a4f5ec | 333 | } |
5bc17018 | 334 | } |
53681407 | 335 | |
290b1c8b | 336 | static void tcf_chain_put(struct tcf_chain *chain) |
53681407 JP |
337 | { |
338 | __tcf_chain_put(chain, false); | |
339 | } | |
5bc17018 | 340 | |
1f3ed383 JP |
341 | void tcf_chain_put_by_act(struct tcf_chain *chain) |
342 | { | |
53681407 | 343 | __tcf_chain_put(chain, true); |
1f3ed383 JP |
344 | } |
345 | EXPORT_SYMBOL(tcf_chain_put_by_act); | |
346 | ||
32a4f5ec JP |
347 | static void tcf_chain_put_explicitly_created(struct tcf_chain *chain) |
348 | { | |
349 | if (chain->explicitly_created) | |
350 | tcf_chain_put(chain); | |
351 | } | |
352 | ||
290b1c8b JP |
353 | static void tcf_chain_flush(struct tcf_chain *chain) |
354 | { | |
355 | struct tcf_proto *tp = rtnl_dereference(chain->filter_chain); | |
356 | ||
357 | tcf_chain0_head_change(chain, NULL); | |
358 | while (tp) { | |
359 | RCU_INIT_POINTER(chain->filter_chain, tp->next); | |
360 | tcf_proto_destroy(tp, NULL); | |
361 | tp = rtnl_dereference(chain->filter_chain); | |
362 | tcf_chain_put(chain); | |
363 | } | |
364 | } | |
365 | ||
caa72601 JP |
366 | static bool tcf_block_offload_in_use(struct tcf_block *block) |
367 | { | |
368 | return block->offloadcnt; | |
369 | } | |
370 | ||
371 | static int tcf_block_offload_cmd(struct tcf_block *block, | |
372 | struct net_device *dev, | |
373 | struct tcf_block_ext_info *ei, | |
60513bd8 JH |
374 | enum tc_block_command command, |
375 | struct netlink_ext_ack *extack) | |
8c4083b3 | 376 | { |
8c4083b3 JP |
377 | struct tc_block_offload bo = {}; |
378 | ||
8c4083b3 JP |
379 | bo.command = command; |
380 | bo.binder_type = ei->binder_type; | |
381 | bo.block = block; | |
60513bd8 | 382 | bo.extack = extack; |
caa72601 | 383 | return dev->netdev_ops->ndo_setup_tc(dev, TC_SETUP_BLOCK, &bo); |
8c4083b3 JP |
384 | } |
385 | ||
caa72601 | 386 | static int tcf_block_offload_bind(struct tcf_block *block, struct Qdisc *q, |
60513bd8 JH |
387 | struct tcf_block_ext_info *ei, |
388 | struct netlink_ext_ack *extack) | |
8c4083b3 | 389 | { |
caa72601 JP |
390 | struct net_device *dev = q->dev_queue->dev; |
391 | int err; | |
392 | ||
393 | if (!dev->netdev_ops->ndo_setup_tc) | |
394 | goto no_offload_dev_inc; | |
395 | ||
396 | /* If tc offload feature is disabled and the block we try to bind | |
397 | * to already has some offloaded filters, forbid to bind. | |
398 | */ | |
60513bd8 JH |
399 | if (!tc_can_offload(dev) && tcf_block_offload_in_use(block)) { |
400 | NL_SET_ERR_MSG(extack, "Bind to offloaded block failed as dev has offload disabled"); | |
caa72601 | 401 | return -EOPNOTSUPP; |
60513bd8 | 402 | } |
caa72601 | 403 | |
60513bd8 | 404 | err = tcf_block_offload_cmd(block, dev, ei, TC_BLOCK_BIND, extack); |
caa72601 JP |
405 | if (err == -EOPNOTSUPP) |
406 | goto no_offload_dev_inc; | |
407 | return err; | |
408 | ||
409 | no_offload_dev_inc: | |
410 | if (tcf_block_offload_in_use(block)) | |
411 | return -EOPNOTSUPP; | |
412 | block->nooffloaddevcnt++; | |
413 | return 0; | |
8c4083b3 JP |
414 | } |
415 | ||
416 | static void tcf_block_offload_unbind(struct tcf_block *block, struct Qdisc *q, | |
417 | struct tcf_block_ext_info *ei) | |
418 | { | |
caa72601 JP |
419 | struct net_device *dev = q->dev_queue->dev; |
420 | int err; | |
421 | ||
422 | if (!dev->netdev_ops->ndo_setup_tc) | |
423 | goto no_offload_dev_dec; | |
60513bd8 | 424 | err = tcf_block_offload_cmd(block, dev, ei, TC_BLOCK_UNBIND, NULL); |
caa72601 JP |
425 | if (err == -EOPNOTSUPP) |
426 | goto no_offload_dev_dec; | |
427 | return; | |
428 | ||
429 | no_offload_dev_dec: | |
430 | WARN_ON(block->nooffloaddevcnt-- == 0); | |
8c4083b3 JP |
431 | } |
432 | ||
a9b19443 | 433 | static int |
f71e0ca4 JP |
434 | tcf_chain0_head_change_cb_add(struct tcf_block *block, |
435 | struct tcf_block_ext_info *ei, | |
436 | struct netlink_ext_ack *extack) | |
a9b19443 | 437 | { |
f71e0ca4 | 438 | struct tcf_chain *chain0 = block->chain0.chain; |
a9b19443 JP |
439 | struct tcf_filter_chain_list_item *item; |
440 | ||
441 | item = kmalloc(sizeof(*item), GFP_KERNEL); | |
442 | if (!item) { | |
443 | NL_SET_ERR_MSG(extack, "Memory allocation for head change callback item failed"); | |
444 | return -ENOMEM; | |
445 | } | |
446 | item->chain_head_change = ei->chain_head_change; | |
447 | item->chain_head_change_priv = ei->chain_head_change_priv; | |
f71e0ca4 JP |
448 | if (chain0 && chain0->filter_chain) |
449 | tcf_chain_head_change_item(item, chain0->filter_chain); | |
450 | list_add(&item->list, &block->chain0.filter_chain_list); | |
a9b19443 JP |
451 | return 0; |
452 | } | |
453 | ||
454 | static void | |
f71e0ca4 JP |
455 | tcf_chain0_head_change_cb_del(struct tcf_block *block, |
456 | struct tcf_block_ext_info *ei) | |
a9b19443 | 457 | { |
f71e0ca4 | 458 | struct tcf_chain *chain0 = block->chain0.chain; |
a9b19443 JP |
459 | struct tcf_filter_chain_list_item *item; |
460 | ||
f71e0ca4 | 461 | list_for_each_entry(item, &block->chain0.filter_chain_list, list) { |
a9b19443 JP |
462 | if ((!ei->chain_head_change && !ei->chain_head_change_priv) || |
463 | (item->chain_head_change == ei->chain_head_change && | |
464 | item->chain_head_change_priv == ei->chain_head_change_priv)) { | |
f71e0ca4 JP |
465 | if (chain0) |
466 | tcf_chain_head_change_item(item, NULL); | |
a9b19443 JP |
467 | list_del(&item->list); |
468 | kfree(item); | |
469 | return; | |
470 | } | |
471 | } | |
472 | WARN_ON(1); | |
473 | } | |
474 | ||
48617387 | 475 | struct tcf_net { |
ab281629 | 476 | spinlock_t idr_lock; /* Protects idr */ |
48617387 JP |
477 | struct idr idr; |
478 | }; | |
479 | ||
480 | static unsigned int tcf_net_id; | |
481 | ||
482 | static int tcf_block_insert(struct tcf_block *block, struct net *net, | |
bb047ddd | 483 | struct netlink_ext_ack *extack) |
a9b19443 | 484 | { |
48617387 | 485 | struct tcf_net *tn = net_generic(net, tcf_net_id); |
ab281629 VB |
486 | int err; |
487 | ||
488 | idr_preload(GFP_KERNEL); | |
489 | spin_lock(&tn->idr_lock); | |
490 | err = idr_alloc_u32(&tn->idr, block, &block->index, block->index, | |
491 | GFP_NOWAIT); | |
492 | spin_unlock(&tn->idr_lock); | |
493 | idr_preload_end(); | |
48617387 | 494 | |
ab281629 | 495 | return err; |
a9b19443 JP |
496 | } |
497 | ||
48617387 JP |
498 | static void tcf_block_remove(struct tcf_block *block, struct net *net) |
499 | { | |
500 | struct tcf_net *tn = net_generic(net, tcf_net_id); | |
501 | ||
ab281629 | 502 | spin_lock(&tn->idr_lock); |
9c160941 | 503 | idr_remove(&tn->idr, block->index); |
ab281629 | 504 | spin_unlock(&tn->idr_lock); |
48617387 JP |
505 | } |
506 | ||
507 | static struct tcf_block *tcf_block_create(struct net *net, struct Qdisc *q, | |
bb047ddd | 508 | u32 block_index, |
48617387 | 509 | struct netlink_ext_ack *extack) |
6529eaba | 510 | { |
48617387 | 511 | struct tcf_block *block; |
6529eaba | 512 | |
48617387 | 513 | block = kzalloc(sizeof(*block), GFP_KERNEL); |
8d1a77f9 AA |
514 | if (!block) { |
515 | NL_SET_ERR_MSG(extack, "Memory allocation for block failed"); | |
48617387 | 516 | return ERR_PTR(-ENOMEM); |
8d1a77f9 | 517 | } |
5bc17018 | 518 | INIT_LIST_HEAD(&block->chain_list); |
acb67442 | 519 | INIT_LIST_HEAD(&block->cb_list); |
f36fe1c4 | 520 | INIT_LIST_HEAD(&block->owner_list); |
f71e0ca4 | 521 | INIT_LIST_HEAD(&block->chain0.filter_chain_list); |
acb67442 | 522 | |
cfebd7e2 | 523 | refcount_set(&block->refcnt, 1); |
48617387 | 524 | block->net = net; |
bb047ddd JP |
525 | block->index = block_index; |
526 | ||
527 | /* Don't store q pointer for blocks which are shared */ | |
528 | if (!tcf_block_shared(block)) | |
529 | block->q = q; | |
48617387 | 530 | return block; |
48617387 JP |
531 | } |
532 | ||
533 | static struct tcf_block *tcf_block_lookup(struct net *net, u32 block_index) | |
534 | { | |
535 | struct tcf_net *tn = net_generic(net, tcf_net_id); | |
536 | ||
322d884b | 537 | return idr_find(&tn->idr, block_index); |
48617387 JP |
538 | } |
539 | ||
0607e439 VB |
540 | static struct tcf_block *tcf_block_refcnt_get(struct net *net, u32 block_index) |
541 | { | |
542 | struct tcf_block *block; | |
543 | ||
544 | rcu_read_lock(); | |
545 | block = tcf_block_lookup(net, block_index); | |
546 | if (block && !refcount_inc_not_zero(&block->refcnt)) | |
547 | block = NULL; | |
548 | rcu_read_unlock(); | |
549 | ||
550 | return block; | |
551 | } | |
552 | ||
f0023436 VB |
553 | static void tcf_block_flush_all_chains(struct tcf_block *block) |
554 | { | |
555 | struct tcf_chain *chain; | |
556 | ||
557 | /* Hold a refcnt for all chains, so that they don't disappear | |
558 | * while we are iterating. | |
559 | */ | |
560 | list_for_each_entry(chain, &block->chain_list, list) | |
561 | tcf_chain_hold(chain); | |
562 | ||
563 | list_for_each_entry(chain, &block->chain_list, list) | |
564 | tcf_chain_flush(chain); | |
565 | } | |
566 | ||
567 | static void tcf_block_put_all_chains(struct tcf_block *block) | |
568 | { | |
569 | struct tcf_chain *chain, *tmp; | |
570 | ||
571 | /* At this point, all the chains should have refcnt >= 1. */ | |
572 | list_for_each_entry_safe(chain, tmp, &block->chain_list, list) { | |
573 | tcf_chain_put_explicitly_created(chain); | |
574 | tcf_chain_put(chain); | |
575 | } | |
576 | } | |
577 | ||
0607e439 VB |
578 | static void __tcf_block_put(struct tcf_block *block, struct Qdisc *q, |
579 | struct tcf_block_ext_info *ei) | |
580 | { | |
581 | if (refcount_dec_and_test(&block->refcnt)) { | |
582 | /* Flushing/putting all chains will cause the block to be | |
583 | * deallocated when last chain is freed. However, if chain_list | |
584 | * is empty, block has to be manually deallocated. After block | |
585 | * reference counter reached 0, it is no longer possible to | |
586 | * increment it or add new chains to block. | |
587 | */ | |
588 | bool free_block = list_empty(&block->chain_list); | |
589 | ||
590 | if (tcf_block_shared(block)) | |
591 | tcf_block_remove(block, block->net); | |
592 | if (!free_block) | |
593 | tcf_block_flush_all_chains(block); | |
594 | ||
595 | if (q) | |
596 | tcf_block_offload_unbind(block, q, ei); | |
597 | ||
598 | if (free_block) | |
599 | kfree_rcu(block, rcu); | |
600 | else | |
601 | tcf_block_put_all_chains(block); | |
602 | } else if (q) { | |
603 | tcf_block_offload_unbind(block, q, ei); | |
604 | } | |
605 | } | |
606 | ||
607 | static void tcf_block_refcnt_put(struct tcf_block *block) | |
608 | { | |
609 | __tcf_block_put(block, NULL, NULL); | |
610 | } | |
611 | ||
c431f89b VB |
612 | /* Find tcf block. |
613 | * Set q, parent, cl when appropriate. | |
614 | */ | |
615 | ||
616 | static struct tcf_block *tcf_block_find(struct net *net, struct Qdisc **q, | |
617 | u32 *parent, unsigned long *cl, | |
618 | int ifindex, u32 block_index, | |
619 | struct netlink_ext_ack *extack) | |
620 | { | |
621 | struct tcf_block *block; | |
e368fdb6 | 622 | int err = 0; |
c431f89b VB |
623 | |
624 | if (ifindex == TCM_IFINDEX_MAGIC_BLOCK) { | |
787ce6d0 | 625 | block = tcf_block_refcnt_get(net, block_index); |
c431f89b VB |
626 | if (!block) { |
627 | NL_SET_ERR_MSG(extack, "Block of given index was not found"); | |
628 | return ERR_PTR(-EINVAL); | |
629 | } | |
630 | } else { | |
631 | const struct Qdisc_class_ops *cops; | |
632 | struct net_device *dev; | |
633 | ||
e368fdb6 VB |
634 | rcu_read_lock(); |
635 | ||
c431f89b | 636 | /* Find link */ |
e368fdb6 VB |
637 | dev = dev_get_by_index_rcu(net, ifindex); |
638 | if (!dev) { | |
639 | rcu_read_unlock(); | |
c431f89b | 640 | return ERR_PTR(-ENODEV); |
e368fdb6 | 641 | } |
c431f89b VB |
642 | |
643 | /* Find qdisc */ | |
644 | if (!*parent) { | |
645 | *q = dev->qdisc; | |
646 | *parent = (*q)->handle; | |
647 | } else { | |
e368fdb6 | 648 | *q = qdisc_lookup_rcu(dev, TC_H_MAJ(*parent)); |
c431f89b VB |
649 | if (!*q) { |
650 | NL_SET_ERR_MSG(extack, "Parent Qdisc doesn't exists"); | |
e368fdb6 VB |
651 | err = -EINVAL; |
652 | goto errout_rcu; | |
c431f89b VB |
653 | } |
654 | } | |
655 | ||
e368fdb6 VB |
656 | *q = qdisc_refcount_inc_nz(*q); |
657 | if (!*q) { | |
658 | NL_SET_ERR_MSG(extack, "Parent Qdisc doesn't exists"); | |
659 | err = -EINVAL; | |
660 | goto errout_rcu; | |
661 | } | |
662 | ||
c431f89b VB |
663 | /* Is it classful? */ |
664 | cops = (*q)->ops->cl_ops; | |
665 | if (!cops) { | |
666 | NL_SET_ERR_MSG(extack, "Qdisc not classful"); | |
e368fdb6 VB |
667 | err = -EINVAL; |
668 | goto errout_rcu; | |
c431f89b VB |
669 | } |
670 | ||
671 | if (!cops->tcf_block) { | |
672 | NL_SET_ERR_MSG(extack, "Class doesn't support blocks"); | |
e368fdb6 VB |
673 | err = -EOPNOTSUPP; |
674 | goto errout_rcu; | |
c431f89b VB |
675 | } |
676 | ||
e368fdb6 VB |
677 | /* At this point we know that qdisc is not noop_qdisc, |
678 | * which means that qdisc holds a reference to net_device | |
679 | * and we hold a reference to qdisc, so it is safe to release | |
680 | * rcu read lock. | |
681 | */ | |
682 | rcu_read_unlock(); | |
683 | ||
c431f89b VB |
684 | /* Do we search for filter, attached to class? */ |
685 | if (TC_H_MIN(*parent)) { | |
686 | *cl = cops->find(*q, *parent); | |
687 | if (*cl == 0) { | |
688 | NL_SET_ERR_MSG(extack, "Specified class doesn't exist"); | |
e368fdb6 VB |
689 | err = -ENOENT; |
690 | goto errout_qdisc; | |
c431f89b VB |
691 | } |
692 | } | |
693 | ||
694 | /* And the last stroke */ | |
695 | block = cops->tcf_block(*q, *cl, extack); | |
e368fdb6 VB |
696 | if (!block) { |
697 | err = -EINVAL; | |
698 | goto errout_qdisc; | |
699 | } | |
c431f89b VB |
700 | if (tcf_block_shared(block)) { |
701 | NL_SET_ERR_MSG(extack, "This filter block is shared. Please use the block index to manipulate the filters"); | |
e368fdb6 VB |
702 | err = -EOPNOTSUPP; |
703 | goto errout_qdisc; | |
c431f89b | 704 | } |
787ce6d0 VB |
705 | |
706 | /* Always take reference to block in order to support execution | |
707 | * of rules update path of cls API without rtnl lock. Caller | |
708 | * must release block when it is finished using it. 'if' block | |
709 | * of this conditional obtain reference to block by calling | |
710 | * tcf_block_refcnt_get(). | |
711 | */ | |
712 | refcount_inc(&block->refcnt); | |
c431f89b VB |
713 | } |
714 | ||
715 | return block; | |
e368fdb6 VB |
716 | |
717 | errout_rcu: | |
718 | rcu_read_unlock(); | |
719 | errout_qdisc: | |
720 | if (*q) | |
721 | qdisc_put(*q); | |
722 | return ERR_PTR(err); | |
723 | } | |
724 | ||
725 | static void tcf_block_release(struct Qdisc *q, struct tcf_block *block) | |
726 | { | |
787ce6d0 VB |
727 | if (!IS_ERR_OR_NULL(block)) |
728 | tcf_block_refcnt_put(block); | |
729 | ||
e368fdb6 VB |
730 | if (q) |
731 | qdisc_put(q); | |
c431f89b VB |
732 | } |
733 | ||
f36fe1c4 JP |
734 | struct tcf_block_owner_item { |
735 | struct list_head list; | |
736 | struct Qdisc *q; | |
737 | enum tcf_block_binder_type binder_type; | |
738 | }; | |
739 | ||
740 | static void | |
741 | tcf_block_owner_netif_keep_dst(struct tcf_block *block, | |
742 | struct Qdisc *q, | |
743 | enum tcf_block_binder_type binder_type) | |
744 | { | |
745 | if (block->keep_dst && | |
746 | binder_type != TCF_BLOCK_BINDER_TYPE_CLSACT_INGRESS && | |
747 | binder_type != TCF_BLOCK_BINDER_TYPE_CLSACT_EGRESS) | |
748 | netif_keep_dst(qdisc_dev(q)); | |
749 | } | |
750 | ||
751 | void tcf_block_netif_keep_dst(struct tcf_block *block) | |
752 | { | |
753 | struct tcf_block_owner_item *item; | |
754 | ||
755 | block->keep_dst = true; | |
756 | list_for_each_entry(item, &block->owner_list, list) | |
757 | tcf_block_owner_netif_keep_dst(block, item->q, | |
758 | item->binder_type); | |
759 | } | |
760 | EXPORT_SYMBOL(tcf_block_netif_keep_dst); | |
761 | ||
762 | static int tcf_block_owner_add(struct tcf_block *block, | |
763 | struct Qdisc *q, | |
764 | enum tcf_block_binder_type binder_type) | |
765 | { | |
766 | struct tcf_block_owner_item *item; | |
767 | ||
768 | item = kmalloc(sizeof(*item), GFP_KERNEL); | |
769 | if (!item) | |
770 | return -ENOMEM; | |
771 | item->q = q; | |
772 | item->binder_type = binder_type; | |
773 | list_add(&item->list, &block->owner_list); | |
774 | return 0; | |
775 | } | |
776 | ||
777 | static void tcf_block_owner_del(struct tcf_block *block, | |
778 | struct Qdisc *q, | |
779 | enum tcf_block_binder_type binder_type) | |
780 | { | |
781 | struct tcf_block_owner_item *item; | |
782 | ||
783 | list_for_each_entry(item, &block->owner_list, list) { | |
784 | if (item->q == q && item->binder_type == binder_type) { | |
785 | list_del(&item->list); | |
786 | kfree(item); | |
787 | return; | |
788 | } | |
789 | } | |
790 | WARN_ON(1); | |
791 | } | |
792 | ||
48617387 JP |
793 | int tcf_block_get_ext(struct tcf_block **p_block, struct Qdisc *q, |
794 | struct tcf_block_ext_info *ei, | |
795 | struct netlink_ext_ack *extack) | |
796 | { | |
797 | struct net *net = qdisc_net(q); | |
798 | struct tcf_block *block = NULL; | |
48617387 JP |
799 | int err; |
800 | ||
787ce6d0 | 801 | if (ei->block_index) |
48617387 | 802 | /* block_index not 0 means the shared block is requested */ |
787ce6d0 | 803 | block = tcf_block_refcnt_get(net, ei->block_index); |
48617387 JP |
804 | |
805 | if (!block) { | |
bb047ddd | 806 | block = tcf_block_create(net, q, ei->block_index, extack); |
48617387 JP |
807 | if (IS_ERR(block)) |
808 | return PTR_ERR(block); | |
bb047ddd JP |
809 | if (tcf_block_shared(block)) { |
810 | err = tcf_block_insert(block, net, extack); | |
48617387 JP |
811 | if (err) |
812 | goto err_block_insert; | |
813 | } | |
814 | } | |
815 | ||
f36fe1c4 JP |
816 | err = tcf_block_owner_add(block, q, ei->binder_type); |
817 | if (err) | |
818 | goto err_block_owner_add; | |
819 | ||
820 | tcf_block_owner_netif_keep_dst(block, q, ei->binder_type); | |
821 | ||
f71e0ca4 | 822 | err = tcf_chain0_head_change_cb_add(block, ei, extack); |
a9b19443 | 823 | if (err) |
f71e0ca4 | 824 | goto err_chain0_head_change_cb_add; |
caa72601 | 825 | |
60513bd8 | 826 | err = tcf_block_offload_bind(block, q, ei, extack); |
caa72601 JP |
827 | if (err) |
828 | goto err_block_offload_bind; | |
829 | ||
6529eaba JP |
830 | *p_block = block; |
831 | return 0; | |
2190d1d0 | 832 | |
caa72601 | 833 | err_block_offload_bind: |
f71e0ca4 JP |
834 | tcf_chain0_head_change_cb_del(block, ei); |
835 | err_chain0_head_change_cb_add: | |
f36fe1c4 JP |
836 | tcf_block_owner_del(block, q, ei->binder_type); |
837 | err_block_owner_add: | |
48617387 | 838 | err_block_insert: |
787ce6d0 | 839 | tcf_block_refcnt_put(block); |
2190d1d0 | 840 | return err; |
6529eaba | 841 | } |
8c4083b3 JP |
842 | EXPORT_SYMBOL(tcf_block_get_ext); |
843 | ||
c7eb7d72 JP |
844 | static void tcf_chain_head_change_dflt(struct tcf_proto *tp_head, void *priv) |
845 | { | |
846 | struct tcf_proto __rcu **p_filter_chain = priv; | |
847 | ||
848 | rcu_assign_pointer(*p_filter_chain, tp_head); | |
849 | } | |
850 | ||
8c4083b3 | 851 | int tcf_block_get(struct tcf_block **p_block, |
8d1a77f9 AA |
852 | struct tcf_proto __rcu **p_filter_chain, struct Qdisc *q, |
853 | struct netlink_ext_ack *extack) | |
8c4083b3 | 854 | { |
c7eb7d72 JP |
855 | struct tcf_block_ext_info ei = { |
856 | .chain_head_change = tcf_chain_head_change_dflt, | |
857 | .chain_head_change_priv = p_filter_chain, | |
858 | }; | |
8c4083b3 | 859 | |
c7eb7d72 | 860 | WARN_ON(!p_filter_chain); |
8d1a77f9 | 861 | return tcf_block_get_ext(p_block, q, &ei, extack); |
8c4083b3 | 862 | } |
6529eaba JP |
863 | EXPORT_SYMBOL(tcf_block_get); |
864 | ||
7aa0045d | 865 | /* XXX: Standalone actions are not allowed to jump to any chain, and bound |
a60b3f51 | 866 | * actions should be all removed after flushing. |
7aa0045d | 867 | */ |
c7eb7d72 | 868 | void tcf_block_put_ext(struct tcf_block *block, struct Qdisc *q, |
e1ea2f98 | 869 | struct tcf_block_ext_info *ei) |
7aa0045d | 870 | { |
c30abd5e DM |
871 | if (!block) |
872 | return; | |
f71e0ca4 | 873 | tcf_chain0_head_change_cb_del(block, ei); |
f36fe1c4 | 874 | tcf_block_owner_del(block, q, ei->binder_type); |
a60b3f51 | 875 | |
0607e439 | 876 | __tcf_block_put(block, q, ei); |
6529eaba | 877 | } |
8c4083b3 JP |
878 | EXPORT_SYMBOL(tcf_block_put_ext); |
879 | ||
880 | void tcf_block_put(struct tcf_block *block) | |
881 | { | |
882 | struct tcf_block_ext_info ei = {0, }; | |
883 | ||
4853f128 JP |
884 | if (!block) |
885 | return; | |
c7eb7d72 | 886 | tcf_block_put_ext(block, block->q, &ei); |
8c4083b3 | 887 | } |
e1ea2f98 | 888 | |
6529eaba | 889 | EXPORT_SYMBOL(tcf_block_put); |
cf1facda | 890 | |
acb67442 JP |
891 | struct tcf_block_cb { |
892 | struct list_head list; | |
893 | tc_setup_cb_t *cb; | |
894 | void *cb_ident; | |
895 | void *cb_priv; | |
896 | unsigned int refcnt; | |
897 | }; | |
898 | ||
899 | void *tcf_block_cb_priv(struct tcf_block_cb *block_cb) | |
900 | { | |
901 | return block_cb->cb_priv; | |
902 | } | |
903 | EXPORT_SYMBOL(tcf_block_cb_priv); | |
904 | ||
905 | struct tcf_block_cb *tcf_block_cb_lookup(struct tcf_block *block, | |
906 | tc_setup_cb_t *cb, void *cb_ident) | |
907 | { struct tcf_block_cb *block_cb; | |
908 | ||
909 | list_for_each_entry(block_cb, &block->cb_list, list) | |
910 | if (block_cb->cb == cb && block_cb->cb_ident == cb_ident) | |
911 | return block_cb; | |
912 | return NULL; | |
913 | } | |
914 | EXPORT_SYMBOL(tcf_block_cb_lookup); | |
915 | ||
916 | void tcf_block_cb_incref(struct tcf_block_cb *block_cb) | |
917 | { | |
918 | block_cb->refcnt++; | |
919 | } | |
920 | EXPORT_SYMBOL(tcf_block_cb_incref); | |
921 | ||
922 | unsigned int tcf_block_cb_decref(struct tcf_block_cb *block_cb) | |
923 | { | |
924 | return --block_cb->refcnt; | |
925 | } | |
926 | EXPORT_SYMBOL(tcf_block_cb_decref); | |
927 | ||
32636742 JH |
928 | static int |
929 | tcf_block_playback_offloads(struct tcf_block *block, tc_setup_cb_t *cb, | |
930 | void *cb_priv, bool add, bool offload_in_use, | |
931 | struct netlink_ext_ack *extack) | |
932 | { | |
933 | struct tcf_chain *chain; | |
934 | struct tcf_proto *tp; | |
935 | int err; | |
936 | ||
937 | list_for_each_entry(chain, &block->chain_list, list) { | |
938 | for (tp = rtnl_dereference(chain->filter_chain); tp; | |
939 | tp = rtnl_dereference(tp->next)) { | |
940 | if (tp->ops->reoffload) { | |
941 | err = tp->ops->reoffload(tp, add, cb, cb_priv, | |
942 | extack); | |
943 | if (err && add) | |
944 | goto err_playback_remove; | |
945 | } else if (add && offload_in_use) { | |
946 | err = -EOPNOTSUPP; | |
947 | NL_SET_ERR_MSG(extack, "Filter HW offload failed - classifier without re-offloading support"); | |
948 | goto err_playback_remove; | |
949 | } | |
950 | } | |
951 | } | |
952 | ||
953 | return 0; | |
954 | ||
955 | err_playback_remove: | |
956 | tcf_block_playback_offloads(block, cb, cb_priv, false, offload_in_use, | |
957 | extack); | |
958 | return err; | |
959 | } | |
960 | ||
acb67442 JP |
961 | struct tcf_block_cb *__tcf_block_cb_register(struct tcf_block *block, |
962 | tc_setup_cb_t *cb, void *cb_ident, | |
60513bd8 JH |
963 | void *cb_priv, |
964 | struct netlink_ext_ack *extack) | |
acb67442 JP |
965 | { |
966 | struct tcf_block_cb *block_cb; | |
32636742 | 967 | int err; |
acb67442 | 968 | |
32636742 JH |
969 | /* Replay any already present rules */ |
970 | err = tcf_block_playback_offloads(block, cb, cb_priv, true, | |
971 | tcf_block_offload_in_use(block), | |
972 | extack); | |
973 | if (err) | |
974 | return ERR_PTR(err); | |
caa72601 | 975 | |
acb67442 JP |
976 | block_cb = kzalloc(sizeof(*block_cb), GFP_KERNEL); |
977 | if (!block_cb) | |
caa72601 | 978 | return ERR_PTR(-ENOMEM); |
acb67442 JP |
979 | block_cb->cb = cb; |
980 | block_cb->cb_ident = cb_ident; | |
981 | block_cb->cb_priv = cb_priv; | |
982 | list_add(&block_cb->list, &block->cb_list); | |
983 | return block_cb; | |
984 | } | |
985 | EXPORT_SYMBOL(__tcf_block_cb_register); | |
986 | ||
987 | int tcf_block_cb_register(struct tcf_block *block, | |
988 | tc_setup_cb_t *cb, void *cb_ident, | |
60513bd8 | 989 | void *cb_priv, struct netlink_ext_ack *extack) |
acb67442 JP |
990 | { |
991 | struct tcf_block_cb *block_cb; | |
992 | ||
60513bd8 JH |
993 | block_cb = __tcf_block_cb_register(block, cb, cb_ident, cb_priv, |
994 | extack); | |
baa2d2b1 | 995 | return PTR_ERR_OR_ZERO(block_cb); |
acb67442 JP |
996 | } |
997 | EXPORT_SYMBOL(tcf_block_cb_register); | |
998 | ||
32636742 JH |
999 | void __tcf_block_cb_unregister(struct tcf_block *block, |
1000 | struct tcf_block_cb *block_cb) | |
acb67442 | 1001 | { |
32636742 JH |
1002 | tcf_block_playback_offloads(block, block_cb->cb, block_cb->cb_priv, |
1003 | false, tcf_block_offload_in_use(block), | |
1004 | NULL); | |
acb67442 JP |
1005 | list_del(&block_cb->list); |
1006 | kfree(block_cb); | |
1007 | } | |
1008 | EXPORT_SYMBOL(__tcf_block_cb_unregister); | |
1009 | ||
1010 | void tcf_block_cb_unregister(struct tcf_block *block, | |
1011 | tc_setup_cb_t *cb, void *cb_ident) | |
1012 | { | |
1013 | struct tcf_block_cb *block_cb; | |
1014 | ||
1015 | block_cb = tcf_block_cb_lookup(block, cb, cb_ident); | |
1016 | if (!block_cb) | |
1017 | return; | |
32636742 | 1018 | __tcf_block_cb_unregister(block, block_cb); |
acb67442 JP |
1019 | } |
1020 | EXPORT_SYMBOL(tcf_block_cb_unregister); | |
1021 | ||
1022 | static int tcf_block_cb_call(struct tcf_block *block, enum tc_setup_type type, | |
1023 | void *type_data, bool err_stop) | |
1024 | { | |
1025 | struct tcf_block_cb *block_cb; | |
1026 | int ok_count = 0; | |
1027 | int err; | |
1028 | ||
9a99dc1c DM |
1029 | /* Make sure all netdevs sharing this block are offload-capable. */ |
1030 | if (block->nooffloaddevcnt && err_stop) | |
1031 | return -EOPNOTSUPP; | |
1032 | ||
acb67442 JP |
1033 | list_for_each_entry(block_cb, &block->cb_list, list) { |
1034 | err = block_cb->cb(type, type_data, block_cb->cb_priv); | |
1035 | if (err) { | |
1036 | if (err_stop) | |
1037 | return err; | |
1038 | } else { | |
1039 | ok_count++; | |
1040 | } | |
1041 | } | |
1042 | return ok_count; | |
1043 | } | |
1044 | ||
87d83093 JP |
1045 | /* Main classifier routine: scans classifier chain attached |
1046 | * to this qdisc, (optionally) tests for protocol and asks | |
1047 | * specific classifiers. | |
1048 | */ | |
1049 | int tcf_classify(struct sk_buff *skb, const struct tcf_proto *tp, | |
1050 | struct tcf_result *res, bool compat_mode) | |
1051 | { | |
1052 | __be16 protocol = tc_skb_protocol(skb); | |
1053 | #ifdef CONFIG_NET_CLS_ACT | |
1054 | const int max_reclassify_loop = 4; | |
ee538dce JP |
1055 | const struct tcf_proto *orig_tp = tp; |
1056 | const struct tcf_proto *first_tp; | |
87d83093 JP |
1057 | int limit = 0; |
1058 | ||
1059 | reclassify: | |
1060 | #endif | |
1061 | for (; tp; tp = rcu_dereference_bh(tp->next)) { | |
1062 | int err; | |
1063 | ||
1064 | if (tp->protocol != protocol && | |
1065 | tp->protocol != htons(ETH_P_ALL)) | |
1066 | continue; | |
1067 | ||
1068 | err = tp->classify(skb, tp, res); | |
1069 | #ifdef CONFIG_NET_CLS_ACT | |
db50514f | 1070 | if (unlikely(err == TC_ACT_RECLASSIFY && !compat_mode)) { |
ee538dce | 1071 | first_tp = orig_tp; |
87d83093 | 1072 | goto reset; |
db50514f | 1073 | } else if (unlikely(TC_ACT_EXT_CMP(err, TC_ACT_GOTO_CHAIN))) { |
ee538dce | 1074 | first_tp = res->goto_tp; |
db50514f JP |
1075 | goto reset; |
1076 | } | |
87d83093 JP |
1077 | #endif |
1078 | if (err >= 0) | |
1079 | return err; | |
1080 | } | |
1081 | ||
1082 | return TC_ACT_UNSPEC; /* signal: continue lookup */ | |
1083 | #ifdef CONFIG_NET_CLS_ACT | |
1084 | reset: | |
1085 | if (unlikely(limit++ >= max_reclassify_loop)) { | |
9d3aaff3 JP |
1086 | net_notice_ratelimited("%u: reclassify loop, rule prio %u, protocol %02x\n", |
1087 | tp->chain->block->index, | |
1088 | tp->prio & 0xffff, | |
87d83093 JP |
1089 | ntohs(tp->protocol)); |
1090 | return TC_ACT_SHOT; | |
1091 | } | |
1092 | ||
ee538dce | 1093 | tp = first_tp; |
87d83093 JP |
1094 | protocol = tc_skb_protocol(skb); |
1095 | goto reclassify; | |
1096 | #endif | |
1097 | } | |
1098 | EXPORT_SYMBOL(tcf_classify); | |
1099 | ||
2190d1d0 JP |
1100 | struct tcf_chain_info { |
1101 | struct tcf_proto __rcu **pprev; | |
1102 | struct tcf_proto __rcu *next; | |
1103 | }; | |
1104 | ||
1105 | static struct tcf_proto *tcf_chain_tp_prev(struct tcf_chain_info *chain_info) | |
1106 | { | |
1107 | return rtnl_dereference(*chain_info->pprev); | |
1108 | } | |
1109 | ||
1110 | static void tcf_chain_tp_insert(struct tcf_chain *chain, | |
1111 | struct tcf_chain_info *chain_info, | |
1112 | struct tcf_proto *tp) | |
1113 | { | |
c7eb7d72 | 1114 | if (*chain_info->pprev == chain->filter_chain) |
f71e0ca4 | 1115 | tcf_chain0_head_change(chain, tp); |
2190d1d0 JP |
1116 | RCU_INIT_POINTER(tp->next, tcf_chain_tp_prev(chain_info)); |
1117 | rcu_assign_pointer(*chain_info->pprev, tp); | |
e2ef7544 | 1118 | tcf_chain_hold(chain); |
2190d1d0 JP |
1119 | } |
1120 | ||
1121 | static void tcf_chain_tp_remove(struct tcf_chain *chain, | |
1122 | struct tcf_chain_info *chain_info, | |
1123 | struct tcf_proto *tp) | |
1124 | { | |
1125 | struct tcf_proto *next = rtnl_dereference(chain_info->next); | |
1126 | ||
c7eb7d72 | 1127 | if (tp == chain->filter_chain) |
f71e0ca4 | 1128 | tcf_chain0_head_change(chain, next); |
2190d1d0 | 1129 | RCU_INIT_POINTER(*chain_info->pprev, next); |
e2ef7544 | 1130 | tcf_chain_put(chain); |
2190d1d0 JP |
1131 | } |
1132 | ||
1133 | static struct tcf_proto *tcf_chain_tp_find(struct tcf_chain *chain, | |
1134 | struct tcf_chain_info *chain_info, | |
1135 | u32 protocol, u32 prio, | |
1136 | bool prio_allocate) | |
1137 | { | |
1138 | struct tcf_proto **pprev; | |
1139 | struct tcf_proto *tp; | |
1140 | ||
1141 | /* Check the chain for existence of proto-tcf with this priority */ | |
1142 | for (pprev = &chain->filter_chain; | |
1143 | (tp = rtnl_dereference(*pprev)); pprev = &tp->next) { | |
1144 | if (tp->prio >= prio) { | |
1145 | if (tp->prio == prio) { | |
1146 | if (prio_allocate || | |
1147 | (tp->protocol != protocol && protocol)) | |
1148 | return ERR_PTR(-EINVAL); | |
1149 | } else { | |
1150 | tp = NULL; | |
1151 | } | |
1152 | break; | |
1153 | } | |
1154 | } | |
1155 | chain_info->pprev = pprev; | |
1156 | chain_info->next = tp ? tp->next : NULL; | |
1157 | return tp; | |
1158 | } | |
1159 | ||
7120371c | 1160 | static int tcf_fill_node(struct net *net, struct sk_buff *skb, |
7960d1da JP |
1161 | struct tcf_proto *tp, struct tcf_block *block, |
1162 | struct Qdisc *q, u32 parent, void *fh, | |
1163 | u32 portid, u32 seq, u16 flags, int event) | |
7120371c WC |
1164 | { |
1165 | struct tcmsg *tcm; | |
1166 | struct nlmsghdr *nlh; | |
1167 | unsigned char *b = skb_tail_pointer(skb); | |
1168 | ||
1169 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags); | |
1170 | if (!nlh) | |
1171 | goto out_nlmsg_trim; | |
1172 | tcm = nlmsg_data(nlh); | |
1173 | tcm->tcm_family = AF_UNSPEC; | |
1174 | tcm->tcm__pad1 = 0; | |
1175 | tcm->tcm__pad2 = 0; | |
7960d1da JP |
1176 | if (q) { |
1177 | tcm->tcm_ifindex = qdisc_dev(q)->ifindex; | |
1178 | tcm->tcm_parent = parent; | |
1179 | } else { | |
1180 | tcm->tcm_ifindex = TCM_IFINDEX_MAGIC_BLOCK; | |
1181 | tcm->tcm_block_index = block->index; | |
1182 | } | |
7120371c WC |
1183 | tcm->tcm_info = TC_H_MAKE(tp->prio, tp->protocol); |
1184 | if (nla_put_string(skb, TCA_KIND, tp->ops->kind)) | |
1185 | goto nla_put_failure; | |
1186 | if (nla_put_u32(skb, TCA_CHAIN, tp->chain->index)) | |
1187 | goto nla_put_failure; | |
1188 | if (!fh) { | |
1189 | tcm->tcm_handle = 0; | |
1190 | } else { | |
1191 | if (tp->ops->dump && tp->ops->dump(net, tp, fh, skb, tcm) < 0) | |
1192 | goto nla_put_failure; | |
1193 | } | |
1194 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; | |
1195 | return skb->len; | |
1196 | ||
1197 | out_nlmsg_trim: | |
1198 | nla_put_failure: | |
1199 | nlmsg_trim(skb, b); | |
1200 | return -1; | |
1201 | } | |
1202 | ||
1203 | static int tfilter_notify(struct net *net, struct sk_buff *oskb, | |
1204 | struct nlmsghdr *n, struct tcf_proto *tp, | |
7960d1da JP |
1205 | struct tcf_block *block, struct Qdisc *q, |
1206 | u32 parent, void *fh, int event, bool unicast) | |
7120371c WC |
1207 | { |
1208 | struct sk_buff *skb; | |
1209 | u32 portid = oskb ? NETLINK_CB(oskb).portid : 0; | |
1210 | ||
1211 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
1212 | if (!skb) | |
1213 | return -ENOBUFS; | |
1214 | ||
7960d1da JP |
1215 | if (tcf_fill_node(net, skb, tp, block, q, parent, fh, portid, |
1216 | n->nlmsg_seq, n->nlmsg_flags, event) <= 0) { | |
7120371c WC |
1217 | kfree_skb(skb); |
1218 | return -EINVAL; | |
1219 | } | |
1220 | ||
1221 | if (unicast) | |
1222 | return netlink_unicast(net->rtnl, skb, portid, MSG_DONTWAIT); | |
1223 | ||
1224 | return rtnetlink_send(skb, net, portid, RTNLGRP_TC, | |
1225 | n->nlmsg_flags & NLM_F_ECHO); | |
1226 | } | |
1227 | ||
1228 | static int tfilter_del_notify(struct net *net, struct sk_buff *oskb, | |
1229 | struct nlmsghdr *n, struct tcf_proto *tp, | |
7960d1da | 1230 | struct tcf_block *block, struct Qdisc *q, |
c35a4acc AA |
1231 | u32 parent, void *fh, bool unicast, bool *last, |
1232 | struct netlink_ext_ack *extack) | |
7120371c WC |
1233 | { |
1234 | struct sk_buff *skb; | |
1235 | u32 portid = oskb ? NETLINK_CB(oskb).portid : 0; | |
1236 | int err; | |
1237 | ||
1238 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
1239 | if (!skb) | |
1240 | return -ENOBUFS; | |
1241 | ||
7960d1da JP |
1242 | if (tcf_fill_node(net, skb, tp, block, q, parent, fh, portid, |
1243 | n->nlmsg_seq, n->nlmsg_flags, RTM_DELTFILTER) <= 0) { | |
c35a4acc | 1244 | NL_SET_ERR_MSG(extack, "Failed to build del event notification"); |
7120371c WC |
1245 | kfree_skb(skb); |
1246 | return -EINVAL; | |
1247 | } | |
1248 | ||
571acf21 | 1249 | err = tp->ops->delete(tp, fh, last, extack); |
7120371c WC |
1250 | if (err) { |
1251 | kfree_skb(skb); | |
1252 | return err; | |
1253 | } | |
1254 | ||
1255 | if (unicast) | |
1256 | return netlink_unicast(net->rtnl, skb, portid, MSG_DONTWAIT); | |
1257 | ||
c35a4acc AA |
1258 | err = rtnetlink_send(skb, net, portid, RTNLGRP_TC, |
1259 | n->nlmsg_flags & NLM_F_ECHO); | |
1260 | if (err < 0) | |
1261 | NL_SET_ERR_MSG(extack, "Failed to send filter delete notification"); | |
1262 | return err; | |
7120371c WC |
1263 | } |
1264 | ||
1265 | static void tfilter_notify_chain(struct net *net, struct sk_buff *oskb, | |
7960d1da JP |
1266 | struct tcf_block *block, struct Qdisc *q, |
1267 | u32 parent, struct nlmsghdr *n, | |
7120371c WC |
1268 | struct tcf_chain *chain, int event) |
1269 | { | |
1270 | struct tcf_proto *tp; | |
1271 | ||
1272 | for (tp = rtnl_dereference(chain->filter_chain); | |
1273 | tp; tp = rtnl_dereference(tp->next)) | |
7960d1da | 1274 | tfilter_notify(net, oskb, n, tp, block, |
53189183 | 1275 | q, parent, NULL, event, false); |
7120371c WC |
1276 | } |
1277 | ||
c431f89b | 1278 | static int tc_new_tfilter(struct sk_buff *skb, struct nlmsghdr *n, |
c21ef3e3 | 1279 | struct netlink_ext_ack *extack) |
1da177e4 | 1280 | { |
3b1e0a65 | 1281 | struct net *net = sock_net(skb->sk); |
add93b61 | 1282 | struct nlattr *tca[TCA_MAX + 1]; |
1da177e4 LT |
1283 | struct tcmsg *t; |
1284 | u32 protocol; | |
1285 | u32 prio; | |
9d36d9e5 | 1286 | bool prio_allocate; |
1da177e4 | 1287 | u32 parent; |
5bc17018 | 1288 | u32 chain_index; |
7960d1da | 1289 | struct Qdisc *q = NULL; |
2190d1d0 | 1290 | struct tcf_chain_info chain_info; |
5bc17018 | 1291 | struct tcf_chain *chain = NULL; |
6529eaba | 1292 | struct tcf_block *block; |
1da177e4 | 1293 | struct tcf_proto *tp; |
1da177e4 | 1294 | unsigned long cl; |
8113c095 | 1295 | void *fh; |
1da177e4 | 1296 | int err; |
628185cf | 1297 | int tp_created; |
1da177e4 | 1298 | |
c431f89b | 1299 | if (!netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)) |
dfc47ef8 | 1300 | return -EPERM; |
de179c8c | 1301 | |
1da177e4 | 1302 | replay: |
628185cf DB |
1303 | tp_created = 0; |
1304 | ||
c21ef3e3 | 1305 | err = nlmsg_parse(n, sizeof(*t), tca, TCA_MAX, NULL, extack); |
de179c8c H |
1306 | if (err < 0) |
1307 | return err; | |
1308 | ||
942b8165 | 1309 | t = nlmsg_data(n); |
1da177e4 LT |
1310 | protocol = TC_H_MIN(t->tcm_info); |
1311 | prio = TC_H_MAJ(t->tcm_info); | |
9d36d9e5 | 1312 | prio_allocate = false; |
1da177e4 LT |
1313 | parent = t->tcm_parent; |
1314 | cl = 0; | |
1315 | ||
1316 | if (prio == 0) { | |
c431f89b VB |
1317 | /* If no priority is provided by the user, |
1318 | * we allocate one. | |
1319 | */ | |
1320 | if (n->nlmsg_flags & NLM_F_CREATE) { | |
1321 | prio = TC_H_MAKE(0x80000000U, 0U); | |
1322 | prio_allocate = true; | |
1323 | } else { | |
c35a4acc | 1324 | NL_SET_ERR_MSG(extack, "Invalid filter command with priority of zero"); |
1da177e4 | 1325 | return -ENOENT; |
ea7f8277 | 1326 | } |
1da177e4 LT |
1327 | } |
1328 | ||
1329 | /* Find head of filter chain. */ | |
1330 | ||
c431f89b VB |
1331 | block = tcf_block_find(net, &q, &parent, &cl, |
1332 | t->tcm_ifindex, t->tcm_block_index, extack); | |
1333 | if (IS_ERR(block)) { | |
1334 | err = PTR_ERR(block); | |
1335 | goto errout; | |
6bb16e7a | 1336 | } |
5bc17018 JP |
1337 | |
1338 | chain_index = tca[TCA_CHAIN] ? nla_get_u32(tca[TCA_CHAIN]) : 0; | |
1339 | if (chain_index > TC_ACT_EXT_VAL_MASK) { | |
c35a4acc | 1340 | NL_SET_ERR_MSG(extack, "Specified chain index exceeds upper limit"); |
5bc17018 JP |
1341 | err = -EINVAL; |
1342 | goto errout; | |
1343 | } | |
c431f89b | 1344 | chain = tcf_chain_get(block, chain_index, true); |
5bc17018 | 1345 | if (!chain) { |
d5ed72a5 | 1346 | NL_SET_ERR_MSG(extack, "Cannot create specified filter chain"); |
c431f89b | 1347 | err = -ENOMEM; |
ea7f8277 DB |
1348 | goto errout; |
1349 | } | |
1da177e4 | 1350 | |
2190d1d0 JP |
1351 | tp = tcf_chain_tp_find(chain, &chain_info, protocol, |
1352 | prio, prio_allocate); | |
1353 | if (IS_ERR(tp)) { | |
c35a4acc | 1354 | NL_SET_ERR_MSG(extack, "Filter with specified priority/protocol not found"); |
2190d1d0 JP |
1355 | err = PTR_ERR(tp); |
1356 | goto errout; | |
1da177e4 LT |
1357 | } |
1358 | ||
1359 | if (tp == NULL) { | |
1360 | /* Proto-tcf does not exist, create new one */ | |
1361 | ||
6bb16e7a | 1362 | if (tca[TCA_KIND] == NULL || !protocol) { |
c35a4acc | 1363 | NL_SET_ERR_MSG(extack, "Filter kind and protocol must be specified"); |
6bb16e7a | 1364 | err = -EINVAL; |
1da177e4 | 1365 | goto errout; |
6bb16e7a | 1366 | } |
1da177e4 | 1367 | |
c431f89b | 1368 | if (!(n->nlmsg_flags & NLM_F_CREATE)) { |
c35a4acc | 1369 | NL_SET_ERR_MSG(extack, "Need both RTM_NEWTFILTER and NLM_F_CREATE to create a new filter"); |
6bb16e7a | 1370 | err = -ENOENT; |
1da177e4 | 1371 | goto errout; |
6bb16e7a | 1372 | } |
1da177e4 | 1373 | |
9d36d9e5 | 1374 | if (prio_allocate) |
2190d1d0 | 1375 | prio = tcf_auto_prio(tcf_chain_tp_prev(&chain_info)); |
1da177e4 | 1376 | |
33a48927 | 1377 | tp = tcf_proto_create(nla_data(tca[TCA_KIND]), |
c35a4acc | 1378 | protocol, prio, chain, extack); |
33a48927 JP |
1379 | if (IS_ERR(tp)) { |
1380 | err = PTR_ERR(tp); | |
1da177e4 LT |
1381 | goto errout; |
1382 | } | |
12186be7 | 1383 | tp_created = 1; |
6bb16e7a | 1384 | } else if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], tp->ops->kind)) { |
c35a4acc | 1385 | NL_SET_ERR_MSG(extack, "Specified filter kind does not match existing one"); |
6bb16e7a | 1386 | err = -EINVAL; |
1da177e4 | 1387 | goto errout; |
6bb16e7a | 1388 | } |
1da177e4 LT |
1389 | |
1390 | fh = tp->ops->get(tp, t->tcm_handle); | |
1391 | ||
8113c095 | 1392 | if (!fh) { |
c431f89b | 1393 | if (!(n->nlmsg_flags & NLM_F_CREATE)) { |
c35a4acc | 1394 | NL_SET_ERR_MSG(extack, "Need both RTM_NEWTFILTER and NLM_F_CREATE to create a new filter"); |
6bb16e7a | 1395 | err = -ENOENT; |
1da177e4 | 1396 | goto errout; |
6bb16e7a | 1397 | } |
c431f89b VB |
1398 | } else if (n->nlmsg_flags & NLM_F_EXCL) { |
1399 | NL_SET_ERR_MSG(extack, "Filter already exists"); | |
1400 | err = -EEXIST; | |
1401 | goto errout; | |
1da177e4 LT |
1402 | } |
1403 | ||
9f407f17 JP |
1404 | if (chain->tmplt_ops && chain->tmplt_ops != tp->ops) { |
1405 | NL_SET_ERR_MSG(extack, "Chain template is set to a different filter kind"); | |
1406 | err = -EINVAL; | |
1407 | goto errout; | |
1408 | } | |
1409 | ||
2f7ef2f8 | 1410 | err = tp->ops->change(net, skb, tp, cl, t->tcm_handle, tca, &fh, |
7306db38 AA |
1411 | n->nlmsg_flags & NLM_F_CREATE ? TCA_ACT_NOREPLACE : TCA_ACT_REPLACE, |
1412 | extack); | |
12186be7 | 1413 | if (err == 0) { |
2190d1d0 JP |
1414 | if (tp_created) |
1415 | tcf_chain_tp_insert(chain, &chain_info, tp); | |
7960d1da | 1416 | tfilter_notify(net, skb, n, tp, block, q, parent, fh, |
a10fa201 | 1417 | RTM_NEWTFILTER, false); |
12186be7 MU |
1418 | } else { |
1419 | if (tp_created) | |
715df5ec | 1420 | tcf_proto_destroy(tp, NULL); |
12186be7 | 1421 | } |
1da177e4 LT |
1422 | |
1423 | errout: | |
5bc17018 JP |
1424 | if (chain) |
1425 | tcf_chain_put(chain); | |
e368fdb6 | 1426 | tcf_block_release(q, block); |
1da177e4 LT |
1427 | if (err == -EAGAIN) |
1428 | /* Replay the request. */ | |
1429 | goto replay; | |
1430 | return err; | |
1431 | } | |
1432 | ||
c431f89b VB |
1433 | static int tc_del_tfilter(struct sk_buff *skb, struct nlmsghdr *n, |
1434 | struct netlink_ext_ack *extack) | |
1435 | { | |
1436 | struct net *net = sock_net(skb->sk); | |
1437 | struct nlattr *tca[TCA_MAX + 1]; | |
1438 | struct tcmsg *t; | |
1439 | u32 protocol; | |
1440 | u32 prio; | |
1441 | u32 parent; | |
1442 | u32 chain_index; | |
1443 | struct Qdisc *q = NULL; | |
1444 | struct tcf_chain_info chain_info; | |
1445 | struct tcf_chain *chain = NULL; | |
1446 | struct tcf_block *block; | |
1447 | struct tcf_proto *tp = NULL; | |
1448 | unsigned long cl = 0; | |
1449 | void *fh = NULL; | |
1450 | int err; | |
1451 | ||
1452 | if (!netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)) | |
1453 | return -EPERM; | |
1454 | ||
1455 | err = nlmsg_parse(n, sizeof(*t), tca, TCA_MAX, NULL, extack); | |
1456 | if (err < 0) | |
1457 | return err; | |
1458 | ||
1459 | t = nlmsg_data(n); | |
1460 | protocol = TC_H_MIN(t->tcm_info); | |
1461 | prio = TC_H_MAJ(t->tcm_info); | |
1462 | parent = t->tcm_parent; | |
1463 | ||
1464 | if (prio == 0 && (protocol || t->tcm_handle || tca[TCA_KIND])) { | |
1465 | NL_SET_ERR_MSG(extack, "Cannot flush filters with protocol, handle or kind set"); | |
1466 | return -ENOENT; | |
1467 | } | |
1468 | ||
1469 | /* Find head of filter chain. */ | |
1470 | ||
1471 | block = tcf_block_find(net, &q, &parent, &cl, | |
1472 | t->tcm_ifindex, t->tcm_block_index, extack); | |
1473 | if (IS_ERR(block)) { | |
1474 | err = PTR_ERR(block); | |
1475 | goto errout; | |
1476 | } | |
1477 | ||
1478 | chain_index = tca[TCA_CHAIN] ? nla_get_u32(tca[TCA_CHAIN]) : 0; | |
1479 | if (chain_index > TC_ACT_EXT_VAL_MASK) { | |
1480 | NL_SET_ERR_MSG(extack, "Specified chain index exceeds upper limit"); | |
1481 | err = -EINVAL; | |
1482 | goto errout; | |
1483 | } | |
1484 | chain = tcf_chain_get(block, chain_index, false); | |
1485 | if (!chain) { | |
5ca8a25c JP |
1486 | /* User requested flush on non-existent chain. Nothing to do, |
1487 | * so just return success. | |
1488 | */ | |
1489 | if (prio == 0) { | |
1490 | err = 0; | |
1491 | goto errout; | |
1492 | } | |
c431f89b | 1493 | NL_SET_ERR_MSG(extack, "Cannot find specified filter chain"); |
b7b4247d | 1494 | err = -ENOENT; |
c431f89b VB |
1495 | goto errout; |
1496 | } | |
1497 | ||
1498 | if (prio == 0) { | |
1499 | tfilter_notify_chain(net, skb, block, q, parent, n, | |
1500 | chain, RTM_DELTFILTER); | |
1501 | tcf_chain_flush(chain); | |
1502 | err = 0; | |
1503 | goto errout; | |
1504 | } | |
1505 | ||
1506 | tp = tcf_chain_tp_find(chain, &chain_info, protocol, | |
1507 | prio, false); | |
1508 | if (!tp || IS_ERR(tp)) { | |
1509 | NL_SET_ERR_MSG(extack, "Filter with specified priority/protocol not found"); | |
0e399035 | 1510 | err = tp ? PTR_ERR(tp) : -ENOENT; |
c431f89b VB |
1511 | goto errout; |
1512 | } else if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], tp->ops->kind)) { | |
1513 | NL_SET_ERR_MSG(extack, "Specified filter kind does not match existing one"); | |
1514 | err = -EINVAL; | |
1515 | goto errout; | |
1516 | } | |
1517 | ||
1518 | fh = tp->ops->get(tp, t->tcm_handle); | |
1519 | ||
1520 | if (!fh) { | |
1521 | if (t->tcm_handle == 0) { | |
1522 | tcf_chain_tp_remove(chain, &chain_info, tp); | |
1523 | tfilter_notify(net, skb, n, tp, block, q, parent, fh, | |
1524 | RTM_DELTFILTER, false); | |
1525 | tcf_proto_destroy(tp, extack); | |
1526 | err = 0; | |
1527 | } else { | |
1528 | NL_SET_ERR_MSG(extack, "Specified filter handle not found"); | |
1529 | err = -ENOENT; | |
1530 | } | |
1531 | } else { | |
1532 | bool last; | |
1533 | ||
1534 | err = tfilter_del_notify(net, skb, n, tp, block, | |
1535 | q, parent, fh, false, &last, | |
1536 | extack); | |
1537 | if (err) | |
1538 | goto errout; | |
1539 | if (last) { | |
1540 | tcf_chain_tp_remove(chain, &chain_info, tp); | |
1541 | tcf_proto_destroy(tp, extack); | |
1542 | } | |
1543 | } | |
1544 | ||
1545 | errout: | |
1546 | if (chain) | |
1547 | tcf_chain_put(chain); | |
e368fdb6 | 1548 | tcf_block_release(q, block); |
c431f89b VB |
1549 | return err; |
1550 | } | |
1551 | ||
1552 | static int tc_get_tfilter(struct sk_buff *skb, struct nlmsghdr *n, | |
1553 | struct netlink_ext_ack *extack) | |
1554 | { | |
1555 | struct net *net = sock_net(skb->sk); | |
1556 | struct nlattr *tca[TCA_MAX + 1]; | |
1557 | struct tcmsg *t; | |
1558 | u32 protocol; | |
1559 | u32 prio; | |
1560 | u32 parent; | |
1561 | u32 chain_index; | |
1562 | struct Qdisc *q = NULL; | |
1563 | struct tcf_chain_info chain_info; | |
1564 | struct tcf_chain *chain = NULL; | |
1565 | struct tcf_block *block; | |
1566 | struct tcf_proto *tp = NULL; | |
1567 | unsigned long cl = 0; | |
1568 | void *fh = NULL; | |
1569 | int err; | |
1570 | ||
1571 | err = nlmsg_parse(n, sizeof(*t), tca, TCA_MAX, NULL, extack); | |
1572 | if (err < 0) | |
1573 | return err; | |
1574 | ||
1575 | t = nlmsg_data(n); | |
1576 | protocol = TC_H_MIN(t->tcm_info); | |
1577 | prio = TC_H_MAJ(t->tcm_info); | |
1578 | parent = t->tcm_parent; | |
1579 | ||
1580 | if (prio == 0) { | |
1581 | NL_SET_ERR_MSG(extack, "Invalid filter command with priority of zero"); | |
1582 | return -ENOENT; | |
1583 | } | |
1584 | ||
1585 | /* Find head of filter chain. */ | |
1586 | ||
1587 | block = tcf_block_find(net, &q, &parent, &cl, | |
1588 | t->tcm_ifindex, t->tcm_block_index, extack); | |
1589 | if (IS_ERR(block)) { | |
1590 | err = PTR_ERR(block); | |
1591 | goto errout; | |
1592 | } | |
1593 | ||
1594 | chain_index = tca[TCA_CHAIN] ? nla_get_u32(tca[TCA_CHAIN]) : 0; | |
1595 | if (chain_index > TC_ACT_EXT_VAL_MASK) { | |
1596 | NL_SET_ERR_MSG(extack, "Specified chain index exceeds upper limit"); | |
1597 | err = -EINVAL; | |
1598 | goto errout; | |
1599 | } | |
1600 | chain = tcf_chain_get(block, chain_index, false); | |
1601 | if (!chain) { | |
1602 | NL_SET_ERR_MSG(extack, "Cannot find specified filter chain"); | |
1603 | err = -EINVAL; | |
1604 | goto errout; | |
1605 | } | |
1606 | ||
1607 | tp = tcf_chain_tp_find(chain, &chain_info, protocol, | |
1608 | prio, false); | |
1609 | if (!tp || IS_ERR(tp)) { | |
1610 | NL_SET_ERR_MSG(extack, "Filter with specified priority/protocol not found"); | |
0e399035 | 1611 | err = tp ? PTR_ERR(tp) : -ENOENT; |
c431f89b VB |
1612 | goto errout; |
1613 | } else if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], tp->ops->kind)) { | |
1614 | NL_SET_ERR_MSG(extack, "Specified filter kind does not match existing one"); | |
1615 | err = -EINVAL; | |
1616 | goto errout; | |
1617 | } | |
1618 | ||
1619 | fh = tp->ops->get(tp, t->tcm_handle); | |
1620 | ||
1621 | if (!fh) { | |
1622 | NL_SET_ERR_MSG(extack, "Specified filter handle not found"); | |
1623 | err = -ENOENT; | |
1624 | } else { | |
1625 | err = tfilter_notify(net, skb, n, tp, block, q, parent, | |
1626 | fh, RTM_NEWTFILTER, true); | |
1627 | if (err < 0) | |
1628 | NL_SET_ERR_MSG(extack, "Failed to send filter notify message"); | |
1629 | } | |
1630 | ||
1631 | errout: | |
1632 | if (chain) | |
1633 | tcf_chain_put(chain); | |
e368fdb6 | 1634 | tcf_block_release(q, block); |
c431f89b VB |
1635 | return err; |
1636 | } | |
1637 | ||
aa767bfe | 1638 | struct tcf_dump_args { |
1da177e4 LT |
1639 | struct tcf_walker w; |
1640 | struct sk_buff *skb; | |
1641 | struct netlink_callback *cb; | |
7960d1da | 1642 | struct tcf_block *block; |
a10fa201 JP |
1643 | struct Qdisc *q; |
1644 | u32 parent; | |
1da177e4 LT |
1645 | }; |
1646 | ||
8113c095 | 1647 | static int tcf_node_dump(struct tcf_proto *tp, void *n, struct tcf_walker *arg) |
1da177e4 | 1648 | { |
aa767bfe | 1649 | struct tcf_dump_args *a = (void *)arg; |
832d1d5b | 1650 | struct net *net = sock_net(a->skb->sk); |
1da177e4 | 1651 | |
7960d1da | 1652 | return tcf_fill_node(net, a->skb, tp, a->block, a->q, a->parent, |
a10fa201 | 1653 | n, NETLINK_CB(a->cb->skb).portid, |
5a7a5555 JHS |
1654 | a->cb->nlh->nlmsg_seq, NLM_F_MULTI, |
1655 | RTM_NEWTFILTER); | |
1da177e4 LT |
1656 | } |
1657 | ||
a10fa201 JP |
1658 | static bool tcf_chain_dump(struct tcf_chain *chain, struct Qdisc *q, u32 parent, |
1659 | struct sk_buff *skb, struct netlink_callback *cb, | |
acb31fae JP |
1660 | long index_start, long *p_index) |
1661 | { | |
1662 | struct net *net = sock_net(skb->sk); | |
7960d1da | 1663 | struct tcf_block *block = chain->block; |
acb31fae JP |
1664 | struct tcmsg *tcm = nlmsg_data(cb->nlh); |
1665 | struct tcf_dump_args arg; | |
1666 | struct tcf_proto *tp; | |
1667 | ||
1668 | for (tp = rtnl_dereference(chain->filter_chain); | |
1669 | tp; tp = rtnl_dereference(tp->next), (*p_index)++) { | |
1670 | if (*p_index < index_start) | |
1671 | continue; | |
1672 | if (TC_H_MAJ(tcm->tcm_info) && | |
1673 | TC_H_MAJ(tcm->tcm_info) != tp->prio) | |
1674 | continue; | |
1675 | if (TC_H_MIN(tcm->tcm_info) && | |
1676 | TC_H_MIN(tcm->tcm_info) != tp->protocol) | |
1677 | continue; | |
1678 | if (*p_index > index_start) | |
1679 | memset(&cb->args[1], 0, | |
1680 | sizeof(cb->args) - sizeof(cb->args[0])); | |
1681 | if (cb->args[1] == 0) { | |
53189183 | 1682 | if (tcf_fill_node(net, skb, tp, block, q, parent, NULL, |
acb31fae JP |
1683 | NETLINK_CB(cb->skb).portid, |
1684 | cb->nlh->nlmsg_seq, NLM_F_MULTI, | |
1685 | RTM_NEWTFILTER) <= 0) | |
5bc17018 | 1686 | return false; |
acb31fae JP |
1687 | |
1688 | cb->args[1] = 1; | |
1689 | } | |
1690 | if (!tp->ops->walk) | |
1691 | continue; | |
1692 | arg.w.fn = tcf_node_dump; | |
1693 | arg.skb = skb; | |
1694 | arg.cb = cb; | |
7960d1da | 1695 | arg.block = block; |
a10fa201 JP |
1696 | arg.q = q; |
1697 | arg.parent = parent; | |
acb31fae JP |
1698 | arg.w.stop = 0; |
1699 | arg.w.skip = cb->args[1] - 1; | |
1700 | arg.w.count = 0; | |
01683a14 | 1701 | arg.w.cookie = cb->args[2]; |
acb31fae | 1702 | tp->ops->walk(tp, &arg.w); |
01683a14 | 1703 | cb->args[2] = arg.w.cookie; |
acb31fae JP |
1704 | cb->args[1] = arg.w.count + 1; |
1705 | if (arg.w.stop) | |
5bc17018 | 1706 | return false; |
acb31fae | 1707 | } |
5bc17018 | 1708 | return true; |
acb31fae JP |
1709 | } |
1710 | ||
bd27a875 | 1711 | /* called with RTNL */ |
1da177e4 LT |
1712 | static int tc_dump_tfilter(struct sk_buff *skb, struct netlink_callback *cb) |
1713 | { | |
3b1e0a65 | 1714 | struct net *net = sock_net(skb->sk); |
5bc17018 | 1715 | struct nlattr *tca[TCA_MAX + 1]; |
7960d1da | 1716 | struct Qdisc *q = NULL; |
6529eaba | 1717 | struct tcf_block *block; |
2190d1d0 | 1718 | struct tcf_chain *chain; |
942b8165 | 1719 | struct tcmsg *tcm = nlmsg_data(cb->nlh); |
acb31fae JP |
1720 | long index_start; |
1721 | long index; | |
a10fa201 | 1722 | u32 parent; |
5bc17018 | 1723 | int err; |
1da177e4 | 1724 | |
573ce260 | 1725 | if (nlmsg_len(cb->nlh) < sizeof(*tcm)) |
1da177e4 | 1726 | return skb->len; |
5bc17018 JP |
1727 | |
1728 | err = nlmsg_parse(cb->nlh, sizeof(*tcm), tca, TCA_MAX, NULL, NULL); | |
1729 | if (err) | |
1730 | return err; | |
1731 | ||
7960d1da | 1732 | if (tcm->tcm_ifindex == TCM_IFINDEX_MAGIC_BLOCK) { |
787ce6d0 | 1733 | block = tcf_block_refcnt_get(net, tcm->tcm_block_index); |
7960d1da JP |
1734 | if (!block) |
1735 | goto out; | |
d680b352 JP |
1736 | /* If we work with block index, q is NULL and parent value |
1737 | * will never be used in the following code. The check | |
1738 | * in tcf_fill_node prevents it. However, compiler does not | |
1739 | * see that far, so set parent to zero to silence the warning | |
1740 | * about parent being uninitialized. | |
1741 | */ | |
1742 | parent = 0; | |
a10fa201 | 1743 | } else { |
7960d1da JP |
1744 | const struct Qdisc_class_ops *cops; |
1745 | struct net_device *dev; | |
1746 | unsigned long cl = 0; | |
1747 | ||
1748 | dev = __dev_get_by_index(net, tcm->tcm_ifindex); | |
1749 | if (!dev) | |
1750 | return skb->len; | |
1751 | ||
1752 | parent = tcm->tcm_parent; | |
1753 | if (!parent) { | |
1754 | q = dev->qdisc; | |
1755 | parent = q->handle; | |
1756 | } else { | |
1757 | q = qdisc_lookup(dev, TC_H_MAJ(tcm->tcm_parent)); | |
1758 | } | |
1759 | if (!q) | |
1760 | goto out; | |
1761 | cops = q->ops->cl_ops; | |
1762 | if (!cops) | |
143976ce | 1763 | goto out; |
7960d1da JP |
1764 | if (!cops->tcf_block) |
1765 | goto out; | |
1766 | if (TC_H_MIN(tcm->tcm_parent)) { | |
1767 | cl = cops->find(q, tcm->tcm_parent); | |
1768 | if (cl == 0) | |
1769 | goto out; | |
1770 | } | |
1771 | block = cops->tcf_block(q, cl, NULL); | |
1772 | if (!block) | |
1773 | goto out; | |
1774 | if (tcf_block_shared(block)) | |
1775 | q = NULL; | |
1da177e4 | 1776 | } |
1da177e4 | 1777 | |
acb31fae JP |
1778 | index_start = cb->args[0]; |
1779 | index = 0; | |
5bc17018 JP |
1780 | |
1781 | list_for_each_entry(chain, &block->chain_list, list) { | |
1782 | if (tca[TCA_CHAIN] && | |
1783 | nla_get_u32(tca[TCA_CHAIN]) != chain->index) | |
1784 | continue; | |
a10fa201 | 1785 | if (!tcf_chain_dump(chain, q, parent, skb, cb, |
5ae437ad RK |
1786 | index_start, &index)) { |
1787 | err = -EMSGSIZE; | |
5bc17018 | 1788 | break; |
5ae437ad | 1789 | } |
5bc17018 JP |
1790 | } |
1791 | ||
787ce6d0 VB |
1792 | if (tcm->tcm_ifindex == TCM_IFINDEX_MAGIC_BLOCK) |
1793 | tcf_block_refcnt_put(block); | |
acb31fae | 1794 | cb->args[0] = index; |
1da177e4 | 1795 | |
1da177e4 | 1796 | out: |
5ae437ad RK |
1797 | /* If we did no progress, the error (EMSGSIZE) is real */ |
1798 | if (skb->len == 0 && err) | |
1799 | return err; | |
1da177e4 LT |
1800 | return skb->len; |
1801 | } | |
1802 | ||
32a4f5ec JP |
1803 | static int tc_chain_fill_node(struct tcf_chain *chain, struct net *net, |
1804 | struct sk_buff *skb, struct tcf_block *block, | |
1805 | u32 portid, u32 seq, u16 flags, int event) | |
1806 | { | |
1807 | unsigned char *b = skb_tail_pointer(skb); | |
9f407f17 | 1808 | const struct tcf_proto_ops *ops; |
32a4f5ec JP |
1809 | struct nlmsghdr *nlh; |
1810 | struct tcmsg *tcm; | |
9f407f17 JP |
1811 | void *priv; |
1812 | ||
1813 | ops = chain->tmplt_ops; | |
1814 | priv = chain->tmplt_priv; | |
32a4f5ec JP |
1815 | |
1816 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags); | |
1817 | if (!nlh) | |
1818 | goto out_nlmsg_trim; | |
1819 | tcm = nlmsg_data(nlh); | |
1820 | tcm->tcm_family = AF_UNSPEC; | |
1821 | tcm->tcm__pad1 = 0; | |
1822 | tcm->tcm__pad2 = 0; | |
1823 | tcm->tcm_handle = 0; | |
1824 | if (block->q) { | |
1825 | tcm->tcm_ifindex = qdisc_dev(block->q)->ifindex; | |
1826 | tcm->tcm_parent = block->q->handle; | |
1827 | } else { | |
1828 | tcm->tcm_ifindex = TCM_IFINDEX_MAGIC_BLOCK; | |
1829 | tcm->tcm_block_index = block->index; | |
1830 | } | |
1831 | ||
1832 | if (nla_put_u32(skb, TCA_CHAIN, chain->index)) | |
1833 | goto nla_put_failure; | |
1834 | ||
9f407f17 JP |
1835 | if (ops) { |
1836 | if (nla_put_string(skb, TCA_KIND, ops->kind)) | |
1837 | goto nla_put_failure; | |
1838 | if (ops->tmplt_dump(skb, net, priv) < 0) | |
1839 | goto nla_put_failure; | |
1840 | } | |
1841 | ||
32a4f5ec JP |
1842 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1843 | return skb->len; | |
1844 | ||
1845 | out_nlmsg_trim: | |
1846 | nla_put_failure: | |
1847 | nlmsg_trim(skb, b); | |
1848 | return -EMSGSIZE; | |
1849 | } | |
1850 | ||
1851 | static int tc_chain_notify(struct tcf_chain *chain, struct sk_buff *oskb, | |
1852 | u32 seq, u16 flags, int event, bool unicast) | |
1853 | { | |
1854 | u32 portid = oskb ? NETLINK_CB(oskb).portid : 0; | |
1855 | struct tcf_block *block = chain->block; | |
1856 | struct net *net = block->net; | |
1857 | struct sk_buff *skb; | |
1858 | ||
1859 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
1860 | if (!skb) | |
1861 | return -ENOBUFS; | |
1862 | ||
1863 | if (tc_chain_fill_node(chain, net, skb, block, portid, | |
1864 | seq, flags, event) <= 0) { | |
1865 | kfree_skb(skb); | |
1866 | return -EINVAL; | |
1867 | } | |
1868 | ||
1869 | if (unicast) | |
1870 | return netlink_unicast(net->rtnl, skb, portid, MSG_DONTWAIT); | |
1871 | ||
1872 | return rtnetlink_send(skb, net, portid, RTNLGRP_TC, flags & NLM_F_ECHO); | |
1873 | } | |
1874 | ||
9f407f17 JP |
1875 | static int tc_chain_tmplt_add(struct tcf_chain *chain, struct net *net, |
1876 | struct nlattr **tca, | |
1877 | struct netlink_ext_ack *extack) | |
1878 | { | |
1879 | const struct tcf_proto_ops *ops; | |
1880 | void *tmplt_priv; | |
1881 | ||
1882 | /* If kind is not set, user did not specify template. */ | |
1883 | if (!tca[TCA_KIND]) | |
1884 | return 0; | |
1885 | ||
1886 | ops = tcf_proto_lookup_ops(nla_data(tca[TCA_KIND]), extack); | |
1887 | if (IS_ERR(ops)) | |
1888 | return PTR_ERR(ops); | |
1889 | if (!ops->tmplt_create || !ops->tmplt_destroy || !ops->tmplt_dump) { | |
1890 | NL_SET_ERR_MSG(extack, "Chain templates are not supported with specified classifier"); | |
1891 | return -EOPNOTSUPP; | |
1892 | } | |
1893 | ||
1894 | tmplt_priv = ops->tmplt_create(net, chain, tca, extack); | |
1895 | if (IS_ERR(tmplt_priv)) { | |
1896 | module_put(ops->owner); | |
1897 | return PTR_ERR(tmplt_priv); | |
1898 | } | |
1899 | chain->tmplt_ops = ops; | |
1900 | chain->tmplt_priv = tmplt_priv; | |
1901 | return 0; | |
1902 | } | |
1903 | ||
1904 | static void tc_chain_tmplt_del(struct tcf_chain *chain) | |
1905 | { | |
1906 | const struct tcf_proto_ops *ops = chain->tmplt_ops; | |
1907 | ||
1908 | /* If template ops are set, no work to do for us. */ | |
1909 | if (!ops) | |
1910 | return; | |
1911 | ||
1912 | ops->tmplt_destroy(chain->tmplt_priv); | |
1913 | module_put(ops->owner); | |
1914 | } | |
1915 | ||
32a4f5ec JP |
1916 | /* Add/delete/get a chain */ |
1917 | ||
1918 | static int tc_ctl_chain(struct sk_buff *skb, struct nlmsghdr *n, | |
1919 | struct netlink_ext_ack *extack) | |
1920 | { | |
1921 | struct net *net = sock_net(skb->sk); | |
1922 | struct nlattr *tca[TCA_MAX + 1]; | |
1923 | struct tcmsg *t; | |
1924 | u32 parent; | |
1925 | u32 chain_index; | |
1926 | struct Qdisc *q = NULL; | |
1927 | struct tcf_chain *chain = NULL; | |
1928 | struct tcf_block *block; | |
1929 | unsigned long cl; | |
1930 | int err; | |
1931 | ||
1932 | if (n->nlmsg_type != RTM_GETCHAIN && | |
1933 | !netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)) | |
1934 | return -EPERM; | |
1935 | ||
1936 | replay: | |
1937 | err = nlmsg_parse(n, sizeof(*t), tca, TCA_MAX, NULL, extack); | |
1938 | if (err < 0) | |
1939 | return err; | |
1940 | ||
1941 | t = nlmsg_data(n); | |
1942 | parent = t->tcm_parent; | |
1943 | cl = 0; | |
1944 | ||
1945 | block = tcf_block_find(net, &q, &parent, &cl, | |
1946 | t->tcm_ifindex, t->tcm_block_index, extack); | |
1947 | if (IS_ERR(block)) | |
1948 | return PTR_ERR(block); | |
1949 | ||
1950 | chain_index = tca[TCA_CHAIN] ? nla_get_u32(tca[TCA_CHAIN]) : 0; | |
1951 | if (chain_index > TC_ACT_EXT_VAL_MASK) { | |
1952 | NL_SET_ERR_MSG(extack, "Specified chain index exceeds upper limit"); | |
e368fdb6 VB |
1953 | err = -EINVAL; |
1954 | goto errout_block; | |
32a4f5ec JP |
1955 | } |
1956 | chain = tcf_chain_lookup(block, chain_index); | |
1957 | if (n->nlmsg_type == RTM_NEWCHAIN) { | |
1958 | if (chain) { | |
3d32f4c5 | 1959 | if (tcf_chain_held_by_acts_only(chain)) { |
1f3ed383 | 1960 | /* The chain exists only because there is |
3d32f4c5 | 1961 | * some action referencing it. |
1f3ed383 JP |
1962 | */ |
1963 | tcf_chain_hold(chain); | |
1964 | } else { | |
1965 | NL_SET_ERR_MSG(extack, "Filter chain already exists"); | |
e368fdb6 VB |
1966 | err = -EEXIST; |
1967 | goto errout_block; | |
1f3ed383 JP |
1968 | } |
1969 | } else { | |
1970 | if (!(n->nlmsg_flags & NLM_F_CREATE)) { | |
1971 | NL_SET_ERR_MSG(extack, "Need both RTM_NEWCHAIN and NLM_F_CREATE to create a new chain"); | |
e368fdb6 VB |
1972 | err = -ENOENT; |
1973 | goto errout_block; | |
1f3ed383 JP |
1974 | } |
1975 | chain = tcf_chain_create(block, chain_index); | |
1976 | if (!chain) { | |
1977 | NL_SET_ERR_MSG(extack, "Failed to create filter chain"); | |
e368fdb6 VB |
1978 | err = -ENOMEM; |
1979 | goto errout_block; | |
1f3ed383 | 1980 | } |
32a4f5ec JP |
1981 | } |
1982 | } else { | |
3d32f4c5 | 1983 | if (!chain || tcf_chain_held_by_acts_only(chain)) { |
32a4f5ec | 1984 | NL_SET_ERR_MSG(extack, "Cannot find specified filter chain"); |
e368fdb6 VB |
1985 | err = -EINVAL; |
1986 | goto errout_block; | |
32a4f5ec JP |
1987 | } |
1988 | tcf_chain_hold(chain); | |
1989 | } | |
1990 | ||
1991 | switch (n->nlmsg_type) { | |
1992 | case RTM_NEWCHAIN: | |
9f407f17 JP |
1993 | err = tc_chain_tmplt_add(chain, net, tca, extack); |
1994 | if (err) | |
1995 | goto errout; | |
32a4f5ec JP |
1996 | /* In case the chain was successfully added, take a reference |
1997 | * to the chain. This ensures that an empty chain | |
1998 | * does not disappear at the end of this function. | |
1999 | */ | |
2000 | tcf_chain_hold(chain); | |
2001 | chain->explicitly_created = true; | |
2002 | tc_chain_notify(chain, NULL, 0, NLM_F_CREATE | NLM_F_EXCL, | |
2003 | RTM_NEWCHAIN, false); | |
2004 | break; | |
2005 | case RTM_DELCHAIN: | |
f5b9bac7 CW |
2006 | tfilter_notify_chain(net, skb, block, q, parent, n, |
2007 | chain, RTM_DELTFILTER); | |
32a4f5ec JP |
2008 | /* Flush the chain first as the user requested chain removal. */ |
2009 | tcf_chain_flush(chain); | |
2010 | /* In case the chain was successfully deleted, put a reference | |
2011 | * to the chain previously taken during addition. | |
2012 | */ | |
2013 | tcf_chain_put_explicitly_created(chain); | |
c921d7db | 2014 | chain->explicitly_created = false; |
32a4f5ec JP |
2015 | break; |
2016 | case RTM_GETCHAIN: | |
32a4f5ec JP |
2017 | err = tc_chain_notify(chain, skb, n->nlmsg_seq, |
2018 | n->nlmsg_seq, n->nlmsg_type, true); | |
2019 | if (err < 0) | |
2020 | NL_SET_ERR_MSG(extack, "Failed to send chain notify message"); | |
2021 | break; | |
2022 | default: | |
2023 | err = -EOPNOTSUPP; | |
2024 | NL_SET_ERR_MSG(extack, "Unsupported message type"); | |
2025 | goto errout; | |
2026 | } | |
2027 | ||
2028 | errout: | |
2029 | tcf_chain_put(chain); | |
e368fdb6 VB |
2030 | errout_block: |
2031 | tcf_block_release(q, block); | |
32a4f5ec JP |
2032 | if (err == -EAGAIN) |
2033 | /* Replay the request. */ | |
2034 | goto replay; | |
2035 | return err; | |
2036 | } | |
2037 | ||
2038 | /* called with RTNL */ | |
2039 | static int tc_dump_chain(struct sk_buff *skb, struct netlink_callback *cb) | |
2040 | { | |
2041 | struct net *net = sock_net(skb->sk); | |
2042 | struct nlattr *tca[TCA_MAX + 1]; | |
2043 | struct Qdisc *q = NULL; | |
2044 | struct tcf_block *block; | |
2045 | struct tcf_chain *chain; | |
2046 | struct tcmsg *tcm = nlmsg_data(cb->nlh); | |
2047 | long index_start; | |
2048 | long index; | |
2049 | u32 parent; | |
2050 | int err; | |
2051 | ||
2052 | if (nlmsg_len(cb->nlh) < sizeof(*tcm)) | |
2053 | return skb->len; | |
2054 | ||
2055 | err = nlmsg_parse(cb->nlh, sizeof(*tcm), tca, TCA_MAX, NULL, NULL); | |
2056 | if (err) | |
2057 | return err; | |
2058 | ||
2059 | if (tcm->tcm_ifindex == TCM_IFINDEX_MAGIC_BLOCK) { | |
787ce6d0 | 2060 | block = tcf_block_refcnt_get(net, tcm->tcm_block_index); |
32a4f5ec JP |
2061 | if (!block) |
2062 | goto out; | |
2063 | /* If we work with block index, q is NULL and parent value | |
2064 | * will never be used in the following code. The check | |
2065 | * in tcf_fill_node prevents it. However, compiler does not | |
2066 | * see that far, so set parent to zero to silence the warning | |
2067 | * about parent being uninitialized. | |
2068 | */ | |
2069 | parent = 0; | |
2070 | } else { | |
2071 | const struct Qdisc_class_ops *cops; | |
2072 | struct net_device *dev; | |
2073 | unsigned long cl = 0; | |
2074 | ||
2075 | dev = __dev_get_by_index(net, tcm->tcm_ifindex); | |
2076 | if (!dev) | |
2077 | return skb->len; | |
2078 | ||
2079 | parent = tcm->tcm_parent; | |
2080 | if (!parent) { | |
2081 | q = dev->qdisc; | |
2082 | parent = q->handle; | |
2083 | } else { | |
2084 | q = qdisc_lookup(dev, TC_H_MAJ(tcm->tcm_parent)); | |
2085 | } | |
2086 | if (!q) | |
2087 | goto out; | |
2088 | cops = q->ops->cl_ops; | |
2089 | if (!cops) | |
2090 | goto out; | |
2091 | if (!cops->tcf_block) | |
2092 | goto out; | |
2093 | if (TC_H_MIN(tcm->tcm_parent)) { | |
2094 | cl = cops->find(q, tcm->tcm_parent); | |
2095 | if (cl == 0) | |
2096 | goto out; | |
2097 | } | |
2098 | block = cops->tcf_block(q, cl, NULL); | |
2099 | if (!block) | |
2100 | goto out; | |
2101 | if (tcf_block_shared(block)) | |
2102 | q = NULL; | |
2103 | } | |
2104 | ||
2105 | index_start = cb->args[0]; | |
2106 | index = 0; | |
2107 | ||
2108 | list_for_each_entry(chain, &block->chain_list, list) { | |
2109 | if ((tca[TCA_CHAIN] && | |
2110 | nla_get_u32(tca[TCA_CHAIN]) != chain->index)) | |
2111 | continue; | |
2112 | if (index < index_start) { | |
2113 | index++; | |
2114 | continue; | |
2115 | } | |
3d32f4c5 | 2116 | if (tcf_chain_held_by_acts_only(chain)) |
1f3ed383 | 2117 | continue; |
32a4f5ec JP |
2118 | err = tc_chain_fill_node(chain, net, skb, block, |
2119 | NETLINK_CB(cb->skb).portid, | |
2120 | cb->nlh->nlmsg_seq, NLM_F_MULTI, | |
2121 | RTM_NEWCHAIN); | |
2122 | if (err <= 0) | |
2123 | break; | |
2124 | index++; | |
2125 | } | |
2126 | ||
787ce6d0 VB |
2127 | if (tcm->tcm_ifindex == TCM_IFINDEX_MAGIC_BLOCK) |
2128 | tcf_block_refcnt_put(block); | |
32a4f5ec JP |
2129 | cb->args[0] = index; |
2130 | ||
2131 | out: | |
2132 | /* If we did no progress, the error (EMSGSIZE) is real */ | |
2133 | if (skb->len == 0 && err) | |
2134 | return err; | |
2135 | return skb->len; | |
2136 | } | |
2137 | ||
18d0264f | 2138 | void tcf_exts_destroy(struct tcf_exts *exts) |
1da177e4 LT |
2139 | { |
2140 | #ifdef CONFIG_NET_CLS_ACT | |
90b73b77 | 2141 | tcf_action_destroy(exts->actions, TCA_ACT_UNBIND); |
22dc13c8 WC |
2142 | kfree(exts->actions); |
2143 | exts->nr_actions = 0; | |
1da177e4 LT |
2144 | #endif |
2145 | } | |
aa767bfe | 2146 | EXPORT_SYMBOL(tcf_exts_destroy); |
1da177e4 | 2147 | |
c1b52739 | 2148 | int tcf_exts_validate(struct net *net, struct tcf_proto *tp, struct nlattr **tb, |
50a56190 AA |
2149 | struct nlattr *rate_tlv, struct tcf_exts *exts, bool ovr, |
2150 | struct netlink_ext_ack *extack) | |
1da177e4 | 2151 | { |
1da177e4 LT |
2152 | #ifdef CONFIG_NET_CLS_ACT |
2153 | { | |
1da177e4 | 2154 | struct tc_action *act; |
d04e6990 | 2155 | size_t attr_size = 0; |
1da177e4 | 2156 | |
5da57f42 | 2157 | if (exts->police && tb[exts->police]) { |
9fb9f251 JP |
2158 | act = tcf_action_init_1(net, tp, tb[exts->police], |
2159 | rate_tlv, "police", ovr, | |
789871bb | 2160 | TCA_ACT_BIND, true, extack); |
ab27cfb8 PM |
2161 | if (IS_ERR(act)) |
2162 | return PTR_ERR(act); | |
1da177e4 | 2163 | |
33be6271 | 2164 | act->type = exts->type = TCA_OLD_COMPAT; |
22dc13c8 WC |
2165 | exts->actions[0] = act; |
2166 | exts->nr_actions = 1; | |
5da57f42 | 2167 | } else if (exts->action && tb[exts->action]) { |
90b73b77 | 2168 | int err; |
22dc13c8 | 2169 | |
9fb9f251 JP |
2170 | err = tcf_action_init(net, tp, tb[exts->action], |
2171 | rate_tlv, NULL, ovr, TCA_ACT_BIND, | |
90b73b77 | 2172 | exts->actions, &attr_size, true, |
789871bb | 2173 | extack); |
90b73b77 | 2174 | if (err < 0) |
33be6271 | 2175 | return err; |
90b73b77 | 2176 | exts->nr_actions = err; |
1da177e4 | 2177 | } |
e4b95c41 | 2178 | exts->net = net; |
1da177e4 | 2179 | } |
1da177e4 | 2180 | #else |
5da57f42 | 2181 | if ((exts->action && tb[exts->action]) || |
50a56190 AA |
2182 | (exts->police && tb[exts->police])) { |
2183 | NL_SET_ERR_MSG(extack, "Classifier actions are not supported per compile options (CONFIG_NET_CLS_ACT)"); | |
1da177e4 | 2184 | return -EOPNOTSUPP; |
50a56190 | 2185 | } |
1da177e4 LT |
2186 | #endif |
2187 | ||
2188 | return 0; | |
2189 | } | |
aa767bfe | 2190 | EXPORT_SYMBOL(tcf_exts_validate); |
1da177e4 | 2191 | |
9b0d4446 | 2192 | void tcf_exts_change(struct tcf_exts *dst, struct tcf_exts *src) |
1da177e4 LT |
2193 | { |
2194 | #ifdef CONFIG_NET_CLS_ACT | |
22dc13c8 WC |
2195 | struct tcf_exts old = *dst; |
2196 | ||
9b0d4446 | 2197 | *dst = *src; |
22dc13c8 | 2198 | tcf_exts_destroy(&old); |
1da177e4 LT |
2199 | #endif |
2200 | } | |
aa767bfe | 2201 | EXPORT_SYMBOL(tcf_exts_change); |
1da177e4 | 2202 | |
22dc13c8 WC |
2203 | #ifdef CONFIG_NET_CLS_ACT |
2204 | static struct tc_action *tcf_exts_first_act(struct tcf_exts *exts) | |
2205 | { | |
2206 | if (exts->nr_actions == 0) | |
2207 | return NULL; | |
2208 | else | |
2209 | return exts->actions[0]; | |
2210 | } | |
2211 | #endif | |
33be6271 | 2212 | |
5da57f42 | 2213 | int tcf_exts_dump(struct sk_buff *skb, struct tcf_exts *exts) |
1da177e4 LT |
2214 | { |
2215 | #ifdef CONFIG_NET_CLS_ACT | |
9cc63db5 CW |
2216 | struct nlattr *nest; |
2217 | ||
978dfd8d | 2218 | if (exts->action && tcf_exts_has_actions(exts)) { |
1da177e4 LT |
2219 | /* |
2220 | * again for backward compatible mode - we want | |
2221 | * to work with both old and new modes of entering | |
2222 | * tc data even if iproute2 was newer - jhs | |
2223 | */ | |
33be6271 | 2224 | if (exts->type != TCA_OLD_COMPAT) { |
5da57f42 | 2225 | nest = nla_nest_start(skb, exts->action); |
4b3550ef PM |
2226 | if (nest == NULL) |
2227 | goto nla_put_failure; | |
22dc13c8 | 2228 | |
90b73b77 | 2229 | if (tcf_action_dump(skb, exts->actions, 0, 0) < 0) |
add93b61 | 2230 | goto nla_put_failure; |
4b3550ef | 2231 | nla_nest_end(skb, nest); |
5da57f42 | 2232 | } else if (exts->police) { |
33be6271 | 2233 | struct tc_action *act = tcf_exts_first_act(exts); |
5da57f42 | 2234 | nest = nla_nest_start(skb, exts->police); |
63acd680 | 2235 | if (nest == NULL || !act) |
4b3550ef | 2236 | goto nla_put_failure; |
33be6271 | 2237 | if (tcf_action_dump_old(skb, act, 0, 0) < 0) |
add93b61 | 2238 | goto nla_put_failure; |
4b3550ef | 2239 | nla_nest_end(skb, nest); |
1da177e4 LT |
2240 | } |
2241 | } | |
1da177e4 | 2242 | return 0; |
9cc63db5 CW |
2243 | |
2244 | nla_put_failure: | |
2245 | nla_nest_cancel(skb, nest); | |
1da177e4 | 2246 | return -1; |
9cc63db5 CW |
2247 | #else |
2248 | return 0; | |
2249 | #endif | |
1da177e4 | 2250 | } |
aa767bfe | 2251 | EXPORT_SYMBOL(tcf_exts_dump); |
1da177e4 | 2252 | |
aa767bfe | 2253 | |
5da57f42 | 2254 | int tcf_exts_dump_stats(struct sk_buff *skb, struct tcf_exts *exts) |
1da177e4 LT |
2255 | { |
2256 | #ifdef CONFIG_NET_CLS_ACT | |
33be6271 | 2257 | struct tc_action *a = tcf_exts_first_act(exts); |
b057df24 | 2258 | if (a != NULL && tcf_action_copy_stats(skb, a, 1) < 0) |
33be6271 | 2259 | return -1; |
1da177e4 LT |
2260 | #endif |
2261 | return 0; | |
1da177e4 | 2262 | } |
aa767bfe | 2263 | EXPORT_SYMBOL(tcf_exts_dump_stats); |
1da177e4 | 2264 | |
717503b9 JP |
2265 | static int tc_exts_setup_cb_egdev_call(struct tcf_exts *exts, |
2266 | enum tc_setup_type type, | |
2267 | void *type_data, bool err_stop) | |
b3f55bdd JP |
2268 | { |
2269 | int ok_count = 0; | |
2270 | #ifdef CONFIG_NET_CLS_ACT | |
2271 | const struct tc_action *a; | |
2272 | struct net_device *dev; | |
9d452ceb | 2273 | int i, ret; |
b3f55bdd JP |
2274 | |
2275 | if (!tcf_exts_has_actions(exts)) | |
2276 | return 0; | |
2277 | ||
9d452ceb OG |
2278 | for (i = 0; i < exts->nr_actions; i++) { |
2279 | a = exts->actions[i]; | |
b3f55bdd JP |
2280 | if (!a->ops->get_dev) |
2281 | continue; | |
2282 | dev = a->ops->get_dev(a); | |
7612fb03 | 2283 | if (!dev) |
b3f55bdd JP |
2284 | continue; |
2285 | ret = tc_setup_cb_egdev_call(dev, type, type_data, err_stop); | |
84a75b32 | 2286 | a->ops->put_dev(dev); |
b3f55bdd JP |
2287 | if (ret < 0) |
2288 | return ret; | |
2289 | ok_count += ret; | |
2290 | } | |
2291 | #endif | |
2292 | return ok_count; | |
2293 | } | |
717503b9 | 2294 | |
208c0f4b JP |
2295 | int tc_setup_cb_call(struct tcf_block *block, struct tcf_exts *exts, |
2296 | enum tc_setup_type type, void *type_data, bool err_stop) | |
717503b9 | 2297 | { |
9a99dc1c | 2298 | int ok_count; |
208c0f4b JP |
2299 | int ret; |
2300 | ||
9a99dc1c DM |
2301 | ret = tcf_block_cb_call(block, type, type_data, err_stop); |
2302 | if (ret < 0) | |
2303 | return ret; | |
2304 | ok_count = ret; | |
208c0f4b | 2305 | |
f8f4bef3 | 2306 | if (!exts || ok_count) |
9a99dc1c | 2307 | return ok_count; |
208c0f4b JP |
2308 | ret = tc_exts_setup_cb_egdev_call(exts, type, type_data, err_stop); |
2309 | if (ret < 0) | |
2310 | return ret; | |
2311 | ok_count += ret; | |
2312 | ||
2313 | return ok_count; | |
717503b9 JP |
2314 | } |
2315 | EXPORT_SYMBOL(tc_setup_cb_call); | |
b3f55bdd | 2316 | |
48617387 JP |
2317 | static __net_init int tcf_net_init(struct net *net) |
2318 | { | |
2319 | struct tcf_net *tn = net_generic(net, tcf_net_id); | |
2320 | ||
ab281629 | 2321 | spin_lock_init(&tn->idr_lock); |
48617387 JP |
2322 | idr_init(&tn->idr); |
2323 | return 0; | |
2324 | } | |
2325 | ||
2326 | static void __net_exit tcf_net_exit(struct net *net) | |
2327 | { | |
2328 | struct tcf_net *tn = net_generic(net, tcf_net_id); | |
2329 | ||
2330 | idr_destroy(&tn->idr); | |
2331 | } | |
2332 | ||
2333 | static struct pernet_operations tcf_net_ops = { | |
2334 | .init = tcf_net_init, | |
2335 | .exit = tcf_net_exit, | |
2336 | .id = &tcf_net_id, | |
2337 | .size = sizeof(struct tcf_net), | |
2338 | }; | |
2339 | ||
1da177e4 LT |
2340 | static int __init tc_filter_init(void) |
2341 | { | |
48617387 JP |
2342 | int err; |
2343 | ||
7aa0045d CW |
2344 | tc_filter_wq = alloc_ordered_workqueue("tc_filter_workqueue", 0); |
2345 | if (!tc_filter_wq) | |
2346 | return -ENOMEM; | |
2347 | ||
48617387 JP |
2348 | err = register_pernet_subsys(&tcf_net_ops); |
2349 | if (err) | |
2350 | goto err_register_pernet_subsys; | |
2351 | ||
c431f89b VB |
2352 | rtnl_register(PF_UNSPEC, RTM_NEWTFILTER, tc_new_tfilter, NULL, 0); |
2353 | rtnl_register(PF_UNSPEC, RTM_DELTFILTER, tc_del_tfilter, NULL, 0); | |
2354 | rtnl_register(PF_UNSPEC, RTM_GETTFILTER, tc_get_tfilter, | |
b97bac64 | 2355 | tc_dump_tfilter, 0); |
32a4f5ec JP |
2356 | rtnl_register(PF_UNSPEC, RTM_NEWCHAIN, tc_ctl_chain, NULL, 0); |
2357 | rtnl_register(PF_UNSPEC, RTM_DELCHAIN, tc_ctl_chain, NULL, 0); | |
2358 | rtnl_register(PF_UNSPEC, RTM_GETCHAIN, tc_ctl_chain, | |
2359 | tc_dump_chain, 0); | |
1da177e4 | 2360 | |
1da177e4 | 2361 | return 0; |
48617387 JP |
2362 | |
2363 | err_register_pernet_subsys: | |
2364 | destroy_workqueue(tc_filter_wq); | |
2365 | return err; | |
1da177e4 LT |
2366 | } |
2367 | ||
2368 | subsys_initcall(tc_filter_init); |