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 | 235 | static void tcf_chain_flush(struct tcf_chain *chain) |
cf1facda | 236 | { |
d7aa04a5 | 237 | struct tcf_proto *tp = rtnl_dereference(chain->filter_chain); |
cf1facda | 238 | |
f71e0ca4 | 239 | tcf_chain0_head_change(chain, NULL); |
d7aa04a5 | 240 | while (tp) { |
2190d1d0 | 241 | RCU_INIT_POINTER(chain->filter_chain, tp->next); |
715df5ec | 242 | tcf_proto_destroy(tp, NULL); |
d7aa04a5 RK |
243 | tp = rtnl_dereference(chain->filter_chain); |
244 | tcf_chain_put(chain); | |
cf1facda | 245 | } |
f93e1cdc JP |
246 | } |
247 | ||
248 | static void tcf_chain_destroy(struct tcf_chain *chain) | |
249 | { | |
efbf7897 CW |
250 | struct tcf_block *block = chain->block; |
251 | ||
e2ef7544 | 252 | list_del(&chain->list); |
f71e0ca4 JP |
253 | if (!chain->index) |
254 | block->chain0.chain = NULL; | |
e2ef7544 | 255 | kfree(chain); |
f71e0ca4 | 256 | if (list_empty(&block->chain_list) && block->refcnt == 0) |
efbf7897 | 257 | kfree(block); |
e2ef7544 | 258 | } |
744a4cf6 | 259 | |
e2ef7544 CW |
260 | static void tcf_chain_hold(struct tcf_chain *chain) |
261 | { | |
262 | ++chain->refcnt; | |
2190d1d0 JP |
263 | } |
264 | ||
3d32f4c5 | 265 | static bool tcf_chain_held_by_acts_only(struct tcf_chain *chain) |
1f3ed383 JP |
266 | { |
267 | /* In case all the references are action references, this | |
3d32f4c5 | 268 | * chain should not be shown to the user. |
1f3ed383 JP |
269 | */ |
270 | return chain->refcnt == chain->action_refcnt; | |
271 | } | |
272 | ||
32a4f5ec JP |
273 | static struct tcf_chain *tcf_chain_lookup(struct tcf_block *block, |
274 | u32 chain_index) | |
5bc17018 JP |
275 | { |
276 | struct tcf_chain *chain; | |
277 | ||
278 | list_for_each_entry(chain, &block->chain_list, list) { | |
32a4f5ec | 279 | if (chain->index == chain_index) |
e2ef7544 | 280 | return chain; |
32a4f5ec JP |
281 | } |
282 | return NULL; | |
283 | } | |
284 | ||
285 | static int tc_chain_notify(struct tcf_chain *chain, struct sk_buff *oskb, | |
286 | u32 seq, u16 flags, int event, bool unicast); | |
287 | ||
53681407 JP |
288 | static struct tcf_chain *__tcf_chain_get(struct tcf_block *block, |
289 | u32 chain_index, bool create, | |
290 | bool by_act) | |
32a4f5ec JP |
291 | { |
292 | struct tcf_chain *chain = tcf_chain_lookup(block, chain_index); | |
293 | ||
294 | if (chain) { | |
295 | tcf_chain_hold(chain); | |
53681407 JP |
296 | } else { |
297 | if (!create) | |
298 | return NULL; | |
299 | chain = tcf_chain_create(block, chain_index); | |
300 | if (!chain) | |
301 | return NULL; | |
5bc17018 | 302 | } |
80532384 | 303 | |
53681407 JP |
304 | if (by_act) |
305 | ++chain->action_refcnt; | |
306 | ||
307 | /* Send notification only in case we got the first | |
308 | * non-action reference. Until then, the chain acts only as | |
309 | * a placeholder for actions pointing to it and user ought | |
310 | * not know about them. | |
311 | */ | |
312 | if (chain->refcnt - chain->action_refcnt == 1 && !by_act) | |
313 | tc_chain_notify(chain, NULL, 0, NLM_F_CREATE | NLM_F_EXCL, | |
314 | RTM_NEWCHAIN, false); | |
315 | ||
32a4f5ec | 316 | return chain; |
5bc17018 | 317 | } |
53681407 JP |
318 | |
319 | struct tcf_chain *tcf_chain_get(struct tcf_block *block, u32 chain_index, | |
320 | bool create) | |
321 | { | |
322 | return __tcf_chain_get(block, chain_index, create, false); | |
323 | } | |
5bc17018 JP |
324 | EXPORT_SYMBOL(tcf_chain_get); |
325 | ||
1f3ed383 JP |
326 | struct tcf_chain *tcf_chain_get_by_act(struct tcf_block *block, u32 chain_index) |
327 | { | |
53681407 | 328 | return __tcf_chain_get(block, chain_index, true, true); |
1f3ed383 JP |
329 | } |
330 | EXPORT_SYMBOL(tcf_chain_get_by_act); | |
331 | ||
9f407f17 JP |
332 | static void tc_chain_tmplt_del(struct tcf_chain *chain); |
333 | ||
53681407 | 334 | static void __tcf_chain_put(struct tcf_chain *chain, bool by_act) |
5bc17018 | 335 | { |
53681407 JP |
336 | if (by_act) |
337 | chain->action_refcnt--; | |
338 | chain->refcnt--; | |
339 | ||
340 | /* The last dropped non-action reference will trigger notification. */ | |
341 | if (chain->refcnt - chain->action_refcnt == 0 && !by_act) | |
32a4f5ec | 342 | tc_chain_notify(chain, NULL, 0, 0, RTM_DELCHAIN, false); |
53681407 JP |
343 | |
344 | if (chain->refcnt == 0) { | |
9f407f17 | 345 | tc_chain_tmplt_del(chain); |
5bc17018 | 346 | tcf_chain_destroy(chain); |
32a4f5ec | 347 | } |
5bc17018 | 348 | } |
53681407 JP |
349 | |
350 | void tcf_chain_put(struct tcf_chain *chain) | |
351 | { | |
352 | __tcf_chain_put(chain, false); | |
353 | } | |
5bc17018 JP |
354 | EXPORT_SYMBOL(tcf_chain_put); |
355 | ||
1f3ed383 JP |
356 | void tcf_chain_put_by_act(struct tcf_chain *chain) |
357 | { | |
53681407 | 358 | __tcf_chain_put(chain, true); |
1f3ed383 JP |
359 | } |
360 | EXPORT_SYMBOL(tcf_chain_put_by_act); | |
361 | ||
32a4f5ec JP |
362 | static void tcf_chain_put_explicitly_created(struct tcf_chain *chain) |
363 | { | |
364 | if (chain->explicitly_created) | |
365 | tcf_chain_put(chain); | |
366 | } | |
367 | ||
caa72601 JP |
368 | static bool tcf_block_offload_in_use(struct tcf_block *block) |
369 | { | |
370 | return block->offloadcnt; | |
371 | } | |
372 | ||
373 | static int tcf_block_offload_cmd(struct tcf_block *block, | |
374 | struct net_device *dev, | |
375 | struct tcf_block_ext_info *ei, | |
60513bd8 JH |
376 | enum tc_block_command command, |
377 | struct netlink_ext_ack *extack) | |
8c4083b3 | 378 | { |
8c4083b3 JP |
379 | struct tc_block_offload bo = {}; |
380 | ||
8c4083b3 JP |
381 | bo.command = command; |
382 | bo.binder_type = ei->binder_type; | |
383 | bo.block = block; | |
60513bd8 | 384 | bo.extack = extack; |
caa72601 | 385 | return dev->netdev_ops->ndo_setup_tc(dev, TC_SETUP_BLOCK, &bo); |
8c4083b3 JP |
386 | } |
387 | ||
caa72601 | 388 | static int tcf_block_offload_bind(struct tcf_block *block, struct Qdisc *q, |
60513bd8 JH |
389 | struct tcf_block_ext_info *ei, |
390 | struct netlink_ext_ack *extack) | |
8c4083b3 | 391 | { |
caa72601 JP |
392 | struct net_device *dev = q->dev_queue->dev; |
393 | int err; | |
394 | ||
395 | if (!dev->netdev_ops->ndo_setup_tc) | |
396 | goto no_offload_dev_inc; | |
397 | ||
398 | /* If tc offload feature is disabled and the block we try to bind | |
399 | * to already has some offloaded filters, forbid to bind. | |
400 | */ | |
60513bd8 JH |
401 | if (!tc_can_offload(dev) && tcf_block_offload_in_use(block)) { |
402 | NL_SET_ERR_MSG(extack, "Bind to offloaded block failed as dev has offload disabled"); | |
caa72601 | 403 | return -EOPNOTSUPP; |
60513bd8 | 404 | } |
caa72601 | 405 | |
60513bd8 | 406 | err = tcf_block_offload_cmd(block, dev, ei, TC_BLOCK_BIND, extack); |
caa72601 JP |
407 | if (err == -EOPNOTSUPP) |
408 | goto no_offload_dev_inc; | |
409 | return err; | |
410 | ||
411 | no_offload_dev_inc: | |
412 | if (tcf_block_offload_in_use(block)) | |
413 | return -EOPNOTSUPP; | |
414 | block->nooffloaddevcnt++; | |
415 | return 0; | |
8c4083b3 JP |
416 | } |
417 | ||
418 | static void tcf_block_offload_unbind(struct tcf_block *block, struct Qdisc *q, | |
419 | struct tcf_block_ext_info *ei) | |
420 | { | |
caa72601 JP |
421 | struct net_device *dev = q->dev_queue->dev; |
422 | int err; | |
423 | ||
424 | if (!dev->netdev_ops->ndo_setup_tc) | |
425 | goto no_offload_dev_dec; | |
60513bd8 | 426 | err = tcf_block_offload_cmd(block, dev, ei, TC_BLOCK_UNBIND, NULL); |
caa72601 JP |
427 | if (err == -EOPNOTSUPP) |
428 | goto no_offload_dev_dec; | |
429 | return; | |
430 | ||
431 | no_offload_dev_dec: | |
432 | WARN_ON(block->nooffloaddevcnt-- == 0); | |
8c4083b3 JP |
433 | } |
434 | ||
a9b19443 | 435 | static int |
f71e0ca4 JP |
436 | tcf_chain0_head_change_cb_add(struct tcf_block *block, |
437 | struct tcf_block_ext_info *ei, | |
438 | struct netlink_ext_ack *extack) | |
a9b19443 | 439 | { |
f71e0ca4 | 440 | struct tcf_chain *chain0 = block->chain0.chain; |
a9b19443 JP |
441 | struct tcf_filter_chain_list_item *item; |
442 | ||
443 | item = kmalloc(sizeof(*item), GFP_KERNEL); | |
444 | if (!item) { | |
445 | NL_SET_ERR_MSG(extack, "Memory allocation for head change callback item failed"); | |
446 | return -ENOMEM; | |
447 | } | |
448 | item->chain_head_change = ei->chain_head_change; | |
449 | item->chain_head_change_priv = ei->chain_head_change_priv; | |
f71e0ca4 JP |
450 | if (chain0 && chain0->filter_chain) |
451 | tcf_chain_head_change_item(item, chain0->filter_chain); | |
452 | list_add(&item->list, &block->chain0.filter_chain_list); | |
a9b19443 JP |
453 | return 0; |
454 | } | |
455 | ||
456 | static void | |
f71e0ca4 JP |
457 | tcf_chain0_head_change_cb_del(struct tcf_block *block, |
458 | struct tcf_block_ext_info *ei) | |
a9b19443 | 459 | { |
f71e0ca4 | 460 | struct tcf_chain *chain0 = block->chain0.chain; |
a9b19443 JP |
461 | struct tcf_filter_chain_list_item *item; |
462 | ||
f71e0ca4 | 463 | list_for_each_entry(item, &block->chain0.filter_chain_list, list) { |
a9b19443 JP |
464 | if ((!ei->chain_head_change && !ei->chain_head_change_priv) || |
465 | (item->chain_head_change == ei->chain_head_change && | |
466 | item->chain_head_change_priv == ei->chain_head_change_priv)) { | |
f71e0ca4 JP |
467 | if (chain0) |
468 | tcf_chain_head_change_item(item, NULL); | |
a9b19443 JP |
469 | list_del(&item->list); |
470 | kfree(item); | |
471 | return; | |
472 | } | |
473 | } | |
474 | WARN_ON(1); | |
475 | } | |
476 | ||
48617387 JP |
477 | struct tcf_net { |
478 | struct idr idr; | |
479 | }; | |
480 | ||
481 | static unsigned int tcf_net_id; | |
482 | ||
483 | static int tcf_block_insert(struct tcf_block *block, struct net *net, | |
bb047ddd | 484 | struct netlink_ext_ack *extack) |
a9b19443 | 485 | { |
48617387 | 486 | struct tcf_net *tn = net_generic(net, tcf_net_id); |
48617387 | 487 | |
bb047ddd JP |
488 | return idr_alloc_u32(&tn->idr, block, &block->index, block->index, |
489 | GFP_KERNEL); | |
a9b19443 JP |
490 | } |
491 | ||
48617387 JP |
492 | static void tcf_block_remove(struct tcf_block *block, struct net *net) |
493 | { | |
494 | struct tcf_net *tn = net_generic(net, tcf_net_id); | |
495 | ||
9c160941 | 496 | idr_remove(&tn->idr, block->index); |
48617387 JP |
497 | } |
498 | ||
499 | static struct tcf_block *tcf_block_create(struct net *net, struct Qdisc *q, | |
bb047ddd | 500 | u32 block_index, |
48617387 | 501 | struct netlink_ext_ack *extack) |
6529eaba | 502 | { |
48617387 | 503 | struct tcf_block *block; |
6529eaba | 504 | |
48617387 | 505 | block = kzalloc(sizeof(*block), GFP_KERNEL); |
8d1a77f9 AA |
506 | if (!block) { |
507 | NL_SET_ERR_MSG(extack, "Memory allocation for block failed"); | |
48617387 | 508 | return ERR_PTR(-ENOMEM); |
8d1a77f9 | 509 | } |
5bc17018 | 510 | INIT_LIST_HEAD(&block->chain_list); |
acb67442 | 511 | INIT_LIST_HEAD(&block->cb_list); |
f36fe1c4 | 512 | INIT_LIST_HEAD(&block->owner_list); |
f71e0ca4 | 513 | INIT_LIST_HEAD(&block->chain0.filter_chain_list); |
acb67442 | 514 | |
48617387 JP |
515 | block->refcnt = 1; |
516 | block->net = net; | |
bb047ddd JP |
517 | block->index = block_index; |
518 | ||
519 | /* Don't store q pointer for blocks which are shared */ | |
520 | if (!tcf_block_shared(block)) | |
521 | block->q = q; | |
48617387 | 522 | return block; |
48617387 JP |
523 | } |
524 | ||
525 | static struct tcf_block *tcf_block_lookup(struct net *net, u32 block_index) | |
526 | { | |
527 | struct tcf_net *tn = net_generic(net, tcf_net_id); | |
528 | ||
322d884b | 529 | return idr_find(&tn->idr, block_index); |
48617387 JP |
530 | } |
531 | ||
c431f89b VB |
532 | /* Find tcf block. |
533 | * Set q, parent, cl when appropriate. | |
534 | */ | |
535 | ||
536 | static struct tcf_block *tcf_block_find(struct net *net, struct Qdisc **q, | |
537 | u32 *parent, unsigned long *cl, | |
538 | int ifindex, u32 block_index, | |
539 | struct netlink_ext_ack *extack) | |
540 | { | |
541 | struct tcf_block *block; | |
542 | ||
543 | if (ifindex == TCM_IFINDEX_MAGIC_BLOCK) { | |
544 | block = tcf_block_lookup(net, block_index); | |
545 | if (!block) { | |
546 | NL_SET_ERR_MSG(extack, "Block of given index was not found"); | |
547 | return ERR_PTR(-EINVAL); | |
548 | } | |
549 | } else { | |
550 | const struct Qdisc_class_ops *cops; | |
551 | struct net_device *dev; | |
552 | ||
553 | /* Find link */ | |
554 | dev = __dev_get_by_index(net, ifindex); | |
555 | if (!dev) | |
556 | return ERR_PTR(-ENODEV); | |
557 | ||
558 | /* Find qdisc */ | |
559 | if (!*parent) { | |
560 | *q = dev->qdisc; | |
561 | *parent = (*q)->handle; | |
562 | } else { | |
563 | *q = qdisc_lookup(dev, TC_H_MAJ(*parent)); | |
564 | if (!*q) { | |
565 | NL_SET_ERR_MSG(extack, "Parent Qdisc doesn't exists"); | |
566 | return ERR_PTR(-EINVAL); | |
567 | } | |
568 | } | |
569 | ||
570 | /* Is it classful? */ | |
571 | cops = (*q)->ops->cl_ops; | |
572 | if (!cops) { | |
573 | NL_SET_ERR_MSG(extack, "Qdisc not classful"); | |
574 | return ERR_PTR(-EINVAL); | |
575 | } | |
576 | ||
577 | if (!cops->tcf_block) { | |
578 | NL_SET_ERR_MSG(extack, "Class doesn't support blocks"); | |
579 | return ERR_PTR(-EOPNOTSUPP); | |
580 | } | |
581 | ||
582 | /* Do we search for filter, attached to class? */ | |
583 | if (TC_H_MIN(*parent)) { | |
584 | *cl = cops->find(*q, *parent); | |
585 | if (*cl == 0) { | |
586 | NL_SET_ERR_MSG(extack, "Specified class doesn't exist"); | |
587 | return ERR_PTR(-ENOENT); | |
588 | } | |
589 | } | |
590 | ||
591 | /* And the last stroke */ | |
592 | block = cops->tcf_block(*q, *cl, extack); | |
593 | if (!block) | |
594 | return ERR_PTR(-EINVAL); | |
595 | if (tcf_block_shared(block)) { | |
596 | NL_SET_ERR_MSG(extack, "This filter block is shared. Please use the block index to manipulate the filters"); | |
597 | return ERR_PTR(-EOPNOTSUPP); | |
598 | } | |
599 | } | |
600 | ||
601 | return block; | |
602 | } | |
603 | ||
f36fe1c4 JP |
604 | struct tcf_block_owner_item { |
605 | struct list_head list; | |
606 | struct Qdisc *q; | |
607 | enum tcf_block_binder_type binder_type; | |
608 | }; | |
609 | ||
610 | static void | |
611 | tcf_block_owner_netif_keep_dst(struct tcf_block *block, | |
612 | struct Qdisc *q, | |
613 | enum tcf_block_binder_type binder_type) | |
614 | { | |
615 | if (block->keep_dst && | |
616 | binder_type != TCF_BLOCK_BINDER_TYPE_CLSACT_INGRESS && | |
617 | binder_type != TCF_BLOCK_BINDER_TYPE_CLSACT_EGRESS) | |
618 | netif_keep_dst(qdisc_dev(q)); | |
619 | } | |
620 | ||
621 | void tcf_block_netif_keep_dst(struct tcf_block *block) | |
622 | { | |
623 | struct tcf_block_owner_item *item; | |
624 | ||
625 | block->keep_dst = true; | |
626 | list_for_each_entry(item, &block->owner_list, list) | |
627 | tcf_block_owner_netif_keep_dst(block, item->q, | |
628 | item->binder_type); | |
629 | } | |
630 | EXPORT_SYMBOL(tcf_block_netif_keep_dst); | |
631 | ||
632 | static int tcf_block_owner_add(struct tcf_block *block, | |
633 | struct Qdisc *q, | |
634 | enum tcf_block_binder_type binder_type) | |
635 | { | |
636 | struct tcf_block_owner_item *item; | |
637 | ||
638 | item = kmalloc(sizeof(*item), GFP_KERNEL); | |
639 | if (!item) | |
640 | return -ENOMEM; | |
641 | item->q = q; | |
642 | item->binder_type = binder_type; | |
643 | list_add(&item->list, &block->owner_list); | |
644 | return 0; | |
645 | } | |
646 | ||
647 | static void tcf_block_owner_del(struct tcf_block *block, | |
648 | struct Qdisc *q, | |
649 | enum tcf_block_binder_type binder_type) | |
650 | { | |
651 | struct tcf_block_owner_item *item; | |
652 | ||
653 | list_for_each_entry(item, &block->owner_list, list) { | |
654 | if (item->q == q && item->binder_type == binder_type) { | |
655 | list_del(&item->list); | |
656 | kfree(item); | |
657 | return; | |
658 | } | |
659 | } | |
660 | WARN_ON(1); | |
661 | } | |
662 | ||
48617387 JP |
663 | int tcf_block_get_ext(struct tcf_block **p_block, struct Qdisc *q, |
664 | struct tcf_block_ext_info *ei, | |
665 | struct netlink_ext_ack *extack) | |
666 | { | |
667 | struct net *net = qdisc_net(q); | |
668 | struct tcf_block *block = NULL; | |
669 | bool created = false; | |
670 | int err; | |
671 | ||
672 | if (ei->block_index) { | |
673 | /* block_index not 0 means the shared block is requested */ | |
674 | block = tcf_block_lookup(net, ei->block_index); | |
675 | if (block) | |
676 | block->refcnt++; | |
677 | } | |
678 | ||
679 | if (!block) { | |
bb047ddd | 680 | block = tcf_block_create(net, q, ei->block_index, extack); |
48617387 JP |
681 | if (IS_ERR(block)) |
682 | return PTR_ERR(block); | |
683 | created = true; | |
bb047ddd JP |
684 | if (tcf_block_shared(block)) { |
685 | err = tcf_block_insert(block, net, extack); | |
48617387 JP |
686 | if (err) |
687 | goto err_block_insert; | |
688 | } | |
689 | } | |
690 | ||
f36fe1c4 JP |
691 | err = tcf_block_owner_add(block, q, ei->binder_type); |
692 | if (err) | |
693 | goto err_block_owner_add; | |
694 | ||
695 | tcf_block_owner_netif_keep_dst(block, q, ei->binder_type); | |
696 | ||
f71e0ca4 | 697 | err = tcf_chain0_head_change_cb_add(block, ei, extack); |
a9b19443 | 698 | if (err) |
f71e0ca4 | 699 | goto err_chain0_head_change_cb_add; |
caa72601 | 700 | |
60513bd8 | 701 | err = tcf_block_offload_bind(block, q, ei, extack); |
caa72601 JP |
702 | if (err) |
703 | goto err_block_offload_bind; | |
704 | ||
6529eaba JP |
705 | *p_block = block; |
706 | return 0; | |
2190d1d0 | 707 | |
caa72601 | 708 | err_block_offload_bind: |
f71e0ca4 JP |
709 | tcf_chain0_head_change_cb_del(block, ei); |
710 | err_chain0_head_change_cb_add: | |
f36fe1c4 JP |
711 | tcf_block_owner_del(block, q, ei->binder_type); |
712 | err_block_owner_add: | |
48617387 JP |
713 | if (created) { |
714 | if (tcf_block_shared(block)) | |
715 | tcf_block_remove(block, net); | |
716 | err_block_insert: | |
48617387 JP |
717 | kfree(block); |
718 | } else { | |
719 | block->refcnt--; | |
720 | } | |
2190d1d0 | 721 | return err; |
6529eaba | 722 | } |
8c4083b3 JP |
723 | EXPORT_SYMBOL(tcf_block_get_ext); |
724 | ||
c7eb7d72 JP |
725 | static void tcf_chain_head_change_dflt(struct tcf_proto *tp_head, void *priv) |
726 | { | |
727 | struct tcf_proto __rcu **p_filter_chain = priv; | |
728 | ||
729 | rcu_assign_pointer(*p_filter_chain, tp_head); | |
730 | } | |
731 | ||
8c4083b3 | 732 | int tcf_block_get(struct tcf_block **p_block, |
8d1a77f9 AA |
733 | struct tcf_proto __rcu **p_filter_chain, struct Qdisc *q, |
734 | struct netlink_ext_ack *extack) | |
8c4083b3 | 735 | { |
c7eb7d72 JP |
736 | struct tcf_block_ext_info ei = { |
737 | .chain_head_change = tcf_chain_head_change_dflt, | |
738 | .chain_head_change_priv = p_filter_chain, | |
739 | }; | |
8c4083b3 | 740 | |
c7eb7d72 | 741 | WARN_ON(!p_filter_chain); |
8d1a77f9 | 742 | return tcf_block_get_ext(p_block, q, &ei, extack); |
8c4083b3 | 743 | } |
6529eaba JP |
744 | EXPORT_SYMBOL(tcf_block_get); |
745 | ||
7aa0045d | 746 | /* XXX: Standalone actions are not allowed to jump to any chain, and bound |
a60b3f51 | 747 | * actions should be all removed after flushing. |
7aa0045d | 748 | */ |
c7eb7d72 | 749 | void tcf_block_put_ext(struct tcf_block *block, struct Qdisc *q, |
e1ea2f98 | 750 | struct tcf_block_ext_info *ei) |
7aa0045d | 751 | { |
efbf7897 | 752 | struct tcf_chain *chain, *tmp; |
1697c4bb | 753 | |
c30abd5e DM |
754 | if (!block) |
755 | return; | |
f71e0ca4 | 756 | tcf_chain0_head_change_cb_del(block, ei); |
f36fe1c4 | 757 | tcf_block_owner_del(block, q, ei->binder_type); |
a60b3f51 | 758 | |
f71e0ca4 | 759 | if (block->refcnt == 1) { |
48617387 JP |
760 | if (tcf_block_shared(block)) |
761 | tcf_block_remove(block, block->net); | |
762 | ||
763 | /* Hold a refcnt for all chains, so that they don't disappear | |
764 | * while we are iterating. | |
765 | */ | |
766 | list_for_each_entry(chain, &block->chain_list, list) | |
767 | tcf_chain_hold(chain); | |
768 | ||
769 | list_for_each_entry(chain, &block->chain_list, list) | |
770 | tcf_chain_flush(chain); | |
771 | } | |
e2ef7544 | 772 | |
4bb1b116 JP |
773 | tcf_block_offload_unbind(block, q, ei); |
774 | ||
f71e0ca4 | 775 | if (block->refcnt == 1) { |
48617387 | 776 | /* At this point, all the chains should have refcnt >= 1. */ |
32a4f5ec JP |
777 | list_for_each_entry_safe(chain, tmp, &block->chain_list, list) { |
778 | tcf_chain_put_explicitly_created(chain); | |
48617387 | 779 | tcf_chain_put(chain); |
32a4f5ec | 780 | } |
df45bf84 | 781 | |
f71e0ca4 JP |
782 | block->refcnt--; |
783 | if (list_empty(&block->chain_list)) | |
784 | kfree(block); | |
48617387 | 785 | } |
6529eaba | 786 | } |
8c4083b3 JP |
787 | EXPORT_SYMBOL(tcf_block_put_ext); |
788 | ||
789 | void tcf_block_put(struct tcf_block *block) | |
790 | { | |
791 | struct tcf_block_ext_info ei = {0, }; | |
792 | ||
4853f128 JP |
793 | if (!block) |
794 | return; | |
c7eb7d72 | 795 | tcf_block_put_ext(block, block->q, &ei); |
8c4083b3 | 796 | } |
e1ea2f98 | 797 | |
6529eaba | 798 | EXPORT_SYMBOL(tcf_block_put); |
cf1facda | 799 | |
acb67442 JP |
800 | struct tcf_block_cb { |
801 | struct list_head list; | |
802 | tc_setup_cb_t *cb; | |
803 | void *cb_ident; | |
804 | void *cb_priv; | |
805 | unsigned int refcnt; | |
806 | }; | |
807 | ||
808 | void *tcf_block_cb_priv(struct tcf_block_cb *block_cb) | |
809 | { | |
810 | return block_cb->cb_priv; | |
811 | } | |
812 | EXPORT_SYMBOL(tcf_block_cb_priv); | |
813 | ||
814 | struct tcf_block_cb *tcf_block_cb_lookup(struct tcf_block *block, | |
815 | tc_setup_cb_t *cb, void *cb_ident) | |
816 | { struct tcf_block_cb *block_cb; | |
817 | ||
818 | list_for_each_entry(block_cb, &block->cb_list, list) | |
819 | if (block_cb->cb == cb && block_cb->cb_ident == cb_ident) | |
820 | return block_cb; | |
821 | return NULL; | |
822 | } | |
823 | EXPORT_SYMBOL(tcf_block_cb_lookup); | |
824 | ||
825 | void tcf_block_cb_incref(struct tcf_block_cb *block_cb) | |
826 | { | |
827 | block_cb->refcnt++; | |
828 | } | |
829 | EXPORT_SYMBOL(tcf_block_cb_incref); | |
830 | ||
831 | unsigned int tcf_block_cb_decref(struct tcf_block_cb *block_cb) | |
832 | { | |
833 | return --block_cb->refcnt; | |
834 | } | |
835 | EXPORT_SYMBOL(tcf_block_cb_decref); | |
836 | ||
32636742 JH |
837 | static int |
838 | tcf_block_playback_offloads(struct tcf_block *block, tc_setup_cb_t *cb, | |
839 | void *cb_priv, bool add, bool offload_in_use, | |
840 | struct netlink_ext_ack *extack) | |
841 | { | |
842 | struct tcf_chain *chain; | |
843 | struct tcf_proto *tp; | |
844 | int err; | |
845 | ||
846 | list_for_each_entry(chain, &block->chain_list, list) { | |
847 | for (tp = rtnl_dereference(chain->filter_chain); tp; | |
848 | tp = rtnl_dereference(tp->next)) { | |
849 | if (tp->ops->reoffload) { | |
850 | err = tp->ops->reoffload(tp, add, cb, cb_priv, | |
851 | extack); | |
852 | if (err && add) | |
853 | goto err_playback_remove; | |
854 | } else if (add && offload_in_use) { | |
855 | err = -EOPNOTSUPP; | |
856 | NL_SET_ERR_MSG(extack, "Filter HW offload failed - classifier without re-offloading support"); | |
857 | goto err_playback_remove; | |
858 | } | |
859 | } | |
860 | } | |
861 | ||
862 | return 0; | |
863 | ||
864 | err_playback_remove: | |
865 | tcf_block_playback_offloads(block, cb, cb_priv, false, offload_in_use, | |
866 | extack); | |
867 | return err; | |
868 | } | |
869 | ||
acb67442 JP |
870 | struct tcf_block_cb *__tcf_block_cb_register(struct tcf_block *block, |
871 | tc_setup_cb_t *cb, void *cb_ident, | |
60513bd8 JH |
872 | void *cb_priv, |
873 | struct netlink_ext_ack *extack) | |
acb67442 JP |
874 | { |
875 | struct tcf_block_cb *block_cb; | |
32636742 | 876 | int err; |
acb67442 | 877 | |
32636742 JH |
878 | /* Replay any already present rules */ |
879 | err = tcf_block_playback_offloads(block, cb, cb_priv, true, | |
880 | tcf_block_offload_in_use(block), | |
881 | extack); | |
882 | if (err) | |
883 | return ERR_PTR(err); | |
caa72601 | 884 | |
acb67442 JP |
885 | block_cb = kzalloc(sizeof(*block_cb), GFP_KERNEL); |
886 | if (!block_cb) | |
caa72601 | 887 | return ERR_PTR(-ENOMEM); |
acb67442 JP |
888 | block_cb->cb = cb; |
889 | block_cb->cb_ident = cb_ident; | |
890 | block_cb->cb_priv = cb_priv; | |
891 | list_add(&block_cb->list, &block->cb_list); | |
892 | return block_cb; | |
893 | } | |
894 | EXPORT_SYMBOL(__tcf_block_cb_register); | |
895 | ||
896 | int tcf_block_cb_register(struct tcf_block *block, | |
897 | tc_setup_cb_t *cb, void *cb_ident, | |
60513bd8 | 898 | void *cb_priv, struct netlink_ext_ack *extack) |
acb67442 JP |
899 | { |
900 | struct tcf_block_cb *block_cb; | |
901 | ||
60513bd8 JH |
902 | block_cb = __tcf_block_cb_register(block, cb, cb_ident, cb_priv, |
903 | extack); | |
baa2d2b1 | 904 | return PTR_ERR_OR_ZERO(block_cb); |
acb67442 JP |
905 | } |
906 | EXPORT_SYMBOL(tcf_block_cb_register); | |
907 | ||
32636742 JH |
908 | void __tcf_block_cb_unregister(struct tcf_block *block, |
909 | struct tcf_block_cb *block_cb) | |
acb67442 | 910 | { |
32636742 JH |
911 | tcf_block_playback_offloads(block, block_cb->cb, block_cb->cb_priv, |
912 | false, tcf_block_offload_in_use(block), | |
913 | NULL); | |
acb67442 JP |
914 | list_del(&block_cb->list); |
915 | kfree(block_cb); | |
916 | } | |
917 | EXPORT_SYMBOL(__tcf_block_cb_unregister); | |
918 | ||
919 | void tcf_block_cb_unregister(struct tcf_block *block, | |
920 | tc_setup_cb_t *cb, void *cb_ident) | |
921 | { | |
922 | struct tcf_block_cb *block_cb; | |
923 | ||
924 | block_cb = tcf_block_cb_lookup(block, cb, cb_ident); | |
925 | if (!block_cb) | |
926 | return; | |
32636742 | 927 | __tcf_block_cb_unregister(block, block_cb); |
acb67442 JP |
928 | } |
929 | EXPORT_SYMBOL(tcf_block_cb_unregister); | |
930 | ||
931 | static int tcf_block_cb_call(struct tcf_block *block, enum tc_setup_type type, | |
932 | void *type_data, bool err_stop) | |
933 | { | |
934 | struct tcf_block_cb *block_cb; | |
935 | int ok_count = 0; | |
936 | int err; | |
937 | ||
9a99dc1c DM |
938 | /* Make sure all netdevs sharing this block are offload-capable. */ |
939 | if (block->nooffloaddevcnt && err_stop) | |
940 | return -EOPNOTSUPP; | |
941 | ||
acb67442 JP |
942 | list_for_each_entry(block_cb, &block->cb_list, list) { |
943 | err = block_cb->cb(type, type_data, block_cb->cb_priv); | |
944 | if (err) { | |
945 | if (err_stop) | |
946 | return err; | |
947 | } else { | |
948 | ok_count++; | |
949 | } | |
950 | } | |
951 | return ok_count; | |
952 | } | |
953 | ||
87d83093 JP |
954 | /* Main classifier routine: scans classifier chain attached |
955 | * to this qdisc, (optionally) tests for protocol and asks | |
956 | * specific classifiers. | |
957 | */ | |
958 | int tcf_classify(struct sk_buff *skb, const struct tcf_proto *tp, | |
959 | struct tcf_result *res, bool compat_mode) | |
960 | { | |
961 | __be16 protocol = tc_skb_protocol(skb); | |
962 | #ifdef CONFIG_NET_CLS_ACT | |
963 | const int max_reclassify_loop = 4; | |
ee538dce JP |
964 | const struct tcf_proto *orig_tp = tp; |
965 | const struct tcf_proto *first_tp; | |
87d83093 JP |
966 | int limit = 0; |
967 | ||
968 | reclassify: | |
969 | #endif | |
970 | for (; tp; tp = rcu_dereference_bh(tp->next)) { | |
971 | int err; | |
972 | ||
973 | if (tp->protocol != protocol && | |
974 | tp->protocol != htons(ETH_P_ALL)) | |
975 | continue; | |
976 | ||
977 | err = tp->classify(skb, tp, res); | |
978 | #ifdef CONFIG_NET_CLS_ACT | |
db50514f | 979 | if (unlikely(err == TC_ACT_RECLASSIFY && !compat_mode)) { |
ee538dce | 980 | first_tp = orig_tp; |
87d83093 | 981 | goto reset; |
db50514f | 982 | } else if (unlikely(TC_ACT_EXT_CMP(err, TC_ACT_GOTO_CHAIN))) { |
ee538dce | 983 | first_tp = res->goto_tp; |
db50514f JP |
984 | goto reset; |
985 | } | |
87d83093 JP |
986 | #endif |
987 | if (err >= 0) | |
988 | return err; | |
989 | } | |
990 | ||
991 | return TC_ACT_UNSPEC; /* signal: continue lookup */ | |
992 | #ifdef CONFIG_NET_CLS_ACT | |
993 | reset: | |
994 | if (unlikely(limit++ >= max_reclassify_loop)) { | |
9d3aaff3 JP |
995 | net_notice_ratelimited("%u: reclassify loop, rule prio %u, protocol %02x\n", |
996 | tp->chain->block->index, | |
997 | tp->prio & 0xffff, | |
87d83093 JP |
998 | ntohs(tp->protocol)); |
999 | return TC_ACT_SHOT; | |
1000 | } | |
1001 | ||
ee538dce | 1002 | tp = first_tp; |
87d83093 JP |
1003 | protocol = tc_skb_protocol(skb); |
1004 | goto reclassify; | |
1005 | #endif | |
1006 | } | |
1007 | EXPORT_SYMBOL(tcf_classify); | |
1008 | ||
2190d1d0 JP |
1009 | struct tcf_chain_info { |
1010 | struct tcf_proto __rcu **pprev; | |
1011 | struct tcf_proto __rcu *next; | |
1012 | }; | |
1013 | ||
1014 | static struct tcf_proto *tcf_chain_tp_prev(struct tcf_chain_info *chain_info) | |
1015 | { | |
1016 | return rtnl_dereference(*chain_info->pprev); | |
1017 | } | |
1018 | ||
1019 | static void tcf_chain_tp_insert(struct tcf_chain *chain, | |
1020 | struct tcf_chain_info *chain_info, | |
1021 | struct tcf_proto *tp) | |
1022 | { | |
c7eb7d72 | 1023 | if (*chain_info->pprev == chain->filter_chain) |
f71e0ca4 | 1024 | tcf_chain0_head_change(chain, tp); |
2190d1d0 JP |
1025 | RCU_INIT_POINTER(tp->next, tcf_chain_tp_prev(chain_info)); |
1026 | rcu_assign_pointer(*chain_info->pprev, tp); | |
e2ef7544 | 1027 | tcf_chain_hold(chain); |
2190d1d0 JP |
1028 | } |
1029 | ||
1030 | static void tcf_chain_tp_remove(struct tcf_chain *chain, | |
1031 | struct tcf_chain_info *chain_info, | |
1032 | struct tcf_proto *tp) | |
1033 | { | |
1034 | struct tcf_proto *next = rtnl_dereference(chain_info->next); | |
1035 | ||
c7eb7d72 | 1036 | if (tp == chain->filter_chain) |
f71e0ca4 | 1037 | tcf_chain0_head_change(chain, next); |
2190d1d0 | 1038 | RCU_INIT_POINTER(*chain_info->pprev, next); |
e2ef7544 | 1039 | tcf_chain_put(chain); |
2190d1d0 JP |
1040 | } |
1041 | ||
1042 | static struct tcf_proto *tcf_chain_tp_find(struct tcf_chain *chain, | |
1043 | struct tcf_chain_info *chain_info, | |
1044 | u32 protocol, u32 prio, | |
1045 | bool prio_allocate) | |
1046 | { | |
1047 | struct tcf_proto **pprev; | |
1048 | struct tcf_proto *tp; | |
1049 | ||
1050 | /* Check the chain for existence of proto-tcf with this priority */ | |
1051 | for (pprev = &chain->filter_chain; | |
1052 | (tp = rtnl_dereference(*pprev)); pprev = &tp->next) { | |
1053 | if (tp->prio >= prio) { | |
1054 | if (tp->prio == prio) { | |
1055 | if (prio_allocate || | |
1056 | (tp->protocol != protocol && protocol)) | |
1057 | return ERR_PTR(-EINVAL); | |
1058 | } else { | |
1059 | tp = NULL; | |
1060 | } | |
1061 | break; | |
1062 | } | |
1063 | } | |
1064 | chain_info->pprev = pprev; | |
1065 | chain_info->next = tp ? tp->next : NULL; | |
1066 | return tp; | |
1067 | } | |
1068 | ||
7120371c | 1069 | static int tcf_fill_node(struct net *net, struct sk_buff *skb, |
7960d1da JP |
1070 | struct tcf_proto *tp, struct tcf_block *block, |
1071 | struct Qdisc *q, u32 parent, void *fh, | |
1072 | u32 portid, u32 seq, u16 flags, int event) | |
7120371c WC |
1073 | { |
1074 | struct tcmsg *tcm; | |
1075 | struct nlmsghdr *nlh; | |
1076 | unsigned char *b = skb_tail_pointer(skb); | |
1077 | ||
1078 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags); | |
1079 | if (!nlh) | |
1080 | goto out_nlmsg_trim; | |
1081 | tcm = nlmsg_data(nlh); | |
1082 | tcm->tcm_family = AF_UNSPEC; | |
1083 | tcm->tcm__pad1 = 0; | |
1084 | tcm->tcm__pad2 = 0; | |
7960d1da JP |
1085 | if (q) { |
1086 | tcm->tcm_ifindex = qdisc_dev(q)->ifindex; | |
1087 | tcm->tcm_parent = parent; | |
1088 | } else { | |
1089 | tcm->tcm_ifindex = TCM_IFINDEX_MAGIC_BLOCK; | |
1090 | tcm->tcm_block_index = block->index; | |
1091 | } | |
7120371c WC |
1092 | tcm->tcm_info = TC_H_MAKE(tp->prio, tp->protocol); |
1093 | if (nla_put_string(skb, TCA_KIND, tp->ops->kind)) | |
1094 | goto nla_put_failure; | |
1095 | if (nla_put_u32(skb, TCA_CHAIN, tp->chain->index)) | |
1096 | goto nla_put_failure; | |
1097 | if (!fh) { | |
1098 | tcm->tcm_handle = 0; | |
1099 | } else { | |
1100 | if (tp->ops->dump && tp->ops->dump(net, tp, fh, skb, tcm) < 0) | |
1101 | goto nla_put_failure; | |
1102 | } | |
1103 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; | |
1104 | return skb->len; | |
1105 | ||
1106 | out_nlmsg_trim: | |
1107 | nla_put_failure: | |
1108 | nlmsg_trim(skb, b); | |
1109 | return -1; | |
1110 | } | |
1111 | ||
1112 | static int tfilter_notify(struct net *net, struct sk_buff *oskb, | |
1113 | struct nlmsghdr *n, struct tcf_proto *tp, | |
7960d1da JP |
1114 | struct tcf_block *block, struct Qdisc *q, |
1115 | u32 parent, void *fh, int event, bool unicast) | |
7120371c WC |
1116 | { |
1117 | struct sk_buff *skb; | |
1118 | u32 portid = oskb ? NETLINK_CB(oskb).portid : 0; | |
1119 | ||
1120 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
1121 | if (!skb) | |
1122 | return -ENOBUFS; | |
1123 | ||
7960d1da JP |
1124 | if (tcf_fill_node(net, skb, tp, block, q, parent, fh, portid, |
1125 | n->nlmsg_seq, n->nlmsg_flags, event) <= 0) { | |
7120371c WC |
1126 | kfree_skb(skb); |
1127 | return -EINVAL; | |
1128 | } | |
1129 | ||
1130 | if (unicast) | |
1131 | return netlink_unicast(net->rtnl, skb, portid, MSG_DONTWAIT); | |
1132 | ||
1133 | return rtnetlink_send(skb, net, portid, RTNLGRP_TC, | |
1134 | n->nlmsg_flags & NLM_F_ECHO); | |
1135 | } | |
1136 | ||
1137 | static int tfilter_del_notify(struct net *net, struct sk_buff *oskb, | |
1138 | struct nlmsghdr *n, struct tcf_proto *tp, | |
7960d1da | 1139 | struct tcf_block *block, struct Qdisc *q, |
c35a4acc AA |
1140 | u32 parent, void *fh, bool unicast, bool *last, |
1141 | struct netlink_ext_ack *extack) | |
7120371c WC |
1142 | { |
1143 | struct sk_buff *skb; | |
1144 | u32 portid = oskb ? NETLINK_CB(oskb).portid : 0; | |
1145 | int err; | |
1146 | ||
1147 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
1148 | if (!skb) | |
1149 | return -ENOBUFS; | |
1150 | ||
7960d1da JP |
1151 | if (tcf_fill_node(net, skb, tp, block, q, parent, fh, portid, |
1152 | n->nlmsg_seq, n->nlmsg_flags, RTM_DELTFILTER) <= 0) { | |
c35a4acc | 1153 | NL_SET_ERR_MSG(extack, "Failed to build del event notification"); |
7120371c WC |
1154 | kfree_skb(skb); |
1155 | return -EINVAL; | |
1156 | } | |
1157 | ||
571acf21 | 1158 | err = tp->ops->delete(tp, fh, last, extack); |
7120371c WC |
1159 | if (err) { |
1160 | kfree_skb(skb); | |
1161 | return err; | |
1162 | } | |
1163 | ||
1164 | if (unicast) | |
1165 | return netlink_unicast(net->rtnl, skb, portid, MSG_DONTWAIT); | |
1166 | ||
c35a4acc AA |
1167 | err = rtnetlink_send(skb, net, portid, RTNLGRP_TC, |
1168 | n->nlmsg_flags & NLM_F_ECHO); | |
1169 | if (err < 0) | |
1170 | NL_SET_ERR_MSG(extack, "Failed to send filter delete notification"); | |
1171 | return err; | |
7120371c WC |
1172 | } |
1173 | ||
1174 | static void tfilter_notify_chain(struct net *net, struct sk_buff *oskb, | |
7960d1da JP |
1175 | struct tcf_block *block, struct Qdisc *q, |
1176 | u32 parent, struct nlmsghdr *n, | |
7120371c WC |
1177 | struct tcf_chain *chain, int event) |
1178 | { | |
1179 | struct tcf_proto *tp; | |
1180 | ||
1181 | for (tp = rtnl_dereference(chain->filter_chain); | |
1182 | tp; tp = rtnl_dereference(tp->next)) | |
7960d1da | 1183 | tfilter_notify(net, oskb, n, tp, block, |
53189183 | 1184 | q, parent, NULL, event, false); |
7120371c WC |
1185 | } |
1186 | ||
c431f89b | 1187 | static int tc_new_tfilter(struct sk_buff *skb, struct nlmsghdr *n, |
c21ef3e3 | 1188 | struct netlink_ext_ack *extack) |
1da177e4 | 1189 | { |
3b1e0a65 | 1190 | struct net *net = sock_net(skb->sk); |
add93b61 | 1191 | struct nlattr *tca[TCA_MAX + 1]; |
1da177e4 LT |
1192 | struct tcmsg *t; |
1193 | u32 protocol; | |
1194 | u32 prio; | |
9d36d9e5 | 1195 | bool prio_allocate; |
1da177e4 | 1196 | u32 parent; |
5bc17018 | 1197 | u32 chain_index; |
7960d1da | 1198 | struct Qdisc *q = NULL; |
2190d1d0 | 1199 | struct tcf_chain_info chain_info; |
5bc17018 | 1200 | struct tcf_chain *chain = NULL; |
6529eaba | 1201 | struct tcf_block *block; |
1da177e4 | 1202 | struct tcf_proto *tp; |
1da177e4 | 1203 | unsigned long cl; |
8113c095 | 1204 | void *fh; |
1da177e4 | 1205 | int err; |
628185cf | 1206 | int tp_created; |
1da177e4 | 1207 | |
c431f89b | 1208 | if (!netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)) |
dfc47ef8 | 1209 | return -EPERM; |
de179c8c | 1210 | |
1da177e4 | 1211 | replay: |
628185cf DB |
1212 | tp_created = 0; |
1213 | ||
c21ef3e3 | 1214 | err = nlmsg_parse(n, sizeof(*t), tca, TCA_MAX, NULL, extack); |
de179c8c H |
1215 | if (err < 0) |
1216 | return err; | |
1217 | ||
942b8165 | 1218 | t = nlmsg_data(n); |
1da177e4 LT |
1219 | protocol = TC_H_MIN(t->tcm_info); |
1220 | prio = TC_H_MAJ(t->tcm_info); | |
9d36d9e5 | 1221 | prio_allocate = false; |
1da177e4 LT |
1222 | parent = t->tcm_parent; |
1223 | cl = 0; | |
1224 | ||
1225 | if (prio == 0) { | |
c431f89b VB |
1226 | /* If no priority is provided by the user, |
1227 | * we allocate one. | |
1228 | */ | |
1229 | if (n->nlmsg_flags & NLM_F_CREATE) { | |
1230 | prio = TC_H_MAKE(0x80000000U, 0U); | |
1231 | prio_allocate = true; | |
1232 | } else { | |
c35a4acc | 1233 | NL_SET_ERR_MSG(extack, "Invalid filter command with priority of zero"); |
1da177e4 | 1234 | return -ENOENT; |
ea7f8277 | 1235 | } |
1da177e4 LT |
1236 | } |
1237 | ||
1238 | /* Find head of filter chain. */ | |
1239 | ||
c431f89b VB |
1240 | block = tcf_block_find(net, &q, &parent, &cl, |
1241 | t->tcm_ifindex, t->tcm_block_index, extack); | |
1242 | if (IS_ERR(block)) { | |
1243 | err = PTR_ERR(block); | |
1244 | goto errout; | |
6bb16e7a | 1245 | } |
5bc17018 JP |
1246 | |
1247 | chain_index = tca[TCA_CHAIN] ? nla_get_u32(tca[TCA_CHAIN]) : 0; | |
1248 | if (chain_index > TC_ACT_EXT_VAL_MASK) { | |
c35a4acc | 1249 | NL_SET_ERR_MSG(extack, "Specified chain index exceeds upper limit"); |
5bc17018 JP |
1250 | err = -EINVAL; |
1251 | goto errout; | |
1252 | } | |
c431f89b | 1253 | chain = tcf_chain_get(block, chain_index, true); |
5bc17018 | 1254 | if (!chain) { |
c35a4acc | 1255 | NL_SET_ERR_MSG(extack, "Cannot find specified filter chain"); |
c431f89b | 1256 | err = -ENOMEM; |
ea7f8277 DB |
1257 | goto errout; |
1258 | } | |
1da177e4 | 1259 | |
2190d1d0 JP |
1260 | tp = tcf_chain_tp_find(chain, &chain_info, protocol, |
1261 | prio, prio_allocate); | |
1262 | if (IS_ERR(tp)) { | |
c35a4acc | 1263 | NL_SET_ERR_MSG(extack, "Filter with specified priority/protocol not found"); |
2190d1d0 JP |
1264 | err = PTR_ERR(tp); |
1265 | goto errout; | |
1da177e4 LT |
1266 | } |
1267 | ||
1268 | if (tp == NULL) { | |
1269 | /* Proto-tcf does not exist, create new one */ | |
1270 | ||
6bb16e7a | 1271 | if (tca[TCA_KIND] == NULL || !protocol) { |
c35a4acc | 1272 | NL_SET_ERR_MSG(extack, "Filter kind and protocol must be specified"); |
6bb16e7a | 1273 | err = -EINVAL; |
1da177e4 | 1274 | goto errout; |
6bb16e7a | 1275 | } |
1da177e4 | 1276 | |
c431f89b | 1277 | if (!(n->nlmsg_flags & NLM_F_CREATE)) { |
c35a4acc | 1278 | NL_SET_ERR_MSG(extack, "Need both RTM_NEWTFILTER and NLM_F_CREATE to create a new filter"); |
6bb16e7a | 1279 | err = -ENOENT; |
1da177e4 | 1280 | goto errout; |
6bb16e7a | 1281 | } |
1da177e4 | 1282 | |
9d36d9e5 | 1283 | if (prio_allocate) |
2190d1d0 | 1284 | prio = tcf_auto_prio(tcf_chain_tp_prev(&chain_info)); |
1da177e4 | 1285 | |
33a48927 | 1286 | tp = tcf_proto_create(nla_data(tca[TCA_KIND]), |
c35a4acc | 1287 | protocol, prio, chain, extack); |
33a48927 JP |
1288 | if (IS_ERR(tp)) { |
1289 | err = PTR_ERR(tp); | |
1da177e4 LT |
1290 | goto errout; |
1291 | } | |
12186be7 | 1292 | tp_created = 1; |
6bb16e7a | 1293 | } else if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], tp->ops->kind)) { |
c35a4acc | 1294 | NL_SET_ERR_MSG(extack, "Specified filter kind does not match existing one"); |
6bb16e7a | 1295 | err = -EINVAL; |
1da177e4 | 1296 | goto errout; |
6bb16e7a | 1297 | } |
1da177e4 LT |
1298 | |
1299 | fh = tp->ops->get(tp, t->tcm_handle); | |
1300 | ||
8113c095 | 1301 | if (!fh) { |
c431f89b | 1302 | if (!(n->nlmsg_flags & NLM_F_CREATE)) { |
c35a4acc | 1303 | NL_SET_ERR_MSG(extack, "Need both RTM_NEWTFILTER and NLM_F_CREATE to create a new filter"); |
6bb16e7a | 1304 | err = -ENOENT; |
1da177e4 | 1305 | goto errout; |
6bb16e7a | 1306 | } |
c431f89b VB |
1307 | } else if (n->nlmsg_flags & NLM_F_EXCL) { |
1308 | NL_SET_ERR_MSG(extack, "Filter already exists"); | |
1309 | err = -EEXIST; | |
1310 | goto errout; | |
1da177e4 LT |
1311 | } |
1312 | ||
9f407f17 JP |
1313 | if (chain->tmplt_ops && chain->tmplt_ops != tp->ops) { |
1314 | NL_SET_ERR_MSG(extack, "Chain template is set to a different filter kind"); | |
1315 | err = -EINVAL; | |
1316 | goto errout; | |
1317 | } | |
1318 | ||
2f7ef2f8 | 1319 | err = tp->ops->change(net, skb, tp, cl, t->tcm_handle, tca, &fh, |
7306db38 AA |
1320 | n->nlmsg_flags & NLM_F_CREATE ? TCA_ACT_NOREPLACE : TCA_ACT_REPLACE, |
1321 | extack); | |
12186be7 | 1322 | if (err == 0) { |
2190d1d0 JP |
1323 | if (tp_created) |
1324 | tcf_chain_tp_insert(chain, &chain_info, tp); | |
7960d1da | 1325 | tfilter_notify(net, skb, n, tp, block, q, parent, fh, |
a10fa201 | 1326 | RTM_NEWTFILTER, false); |
12186be7 MU |
1327 | } else { |
1328 | if (tp_created) | |
715df5ec | 1329 | tcf_proto_destroy(tp, NULL); |
12186be7 | 1330 | } |
1da177e4 LT |
1331 | |
1332 | errout: | |
5bc17018 JP |
1333 | if (chain) |
1334 | tcf_chain_put(chain); | |
1da177e4 LT |
1335 | if (err == -EAGAIN) |
1336 | /* Replay the request. */ | |
1337 | goto replay; | |
1338 | return err; | |
1339 | } | |
1340 | ||
c431f89b VB |
1341 | static int tc_del_tfilter(struct sk_buff *skb, struct nlmsghdr *n, |
1342 | struct netlink_ext_ack *extack) | |
1343 | { | |
1344 | struct net *net = sock_net(skb->sk); | |
1345 | struct nlattr *tca[TCA_MAX + 1]; | |
1346 | struct tcmsg *t; | |
1347 | u32 protocol; | |
1348 | u32 prio; | |
1349 | u32 parent; | |
1350 | u32 chain_index; | |
1351 | struct Qdisc *q = NULL; | |
1352 | struct tcf_chain_info chain_info; | |
1353 | struct tcf_chain *chain = NULL; | |
1354 | struct tcf_block *block; | |
1355 | struct tcf_proto *tp = NULL; | |
1356 | unsigned long cl = 0; | |
1357 | void *fh = NULL; | |
1358 | int err; | |
1359 | ||
1360 | if (!netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)) | |
1361 | return -EPERM; | |
1362 | ||
1363 | err = nlmsg_parse(n, sizeof(*t), tca, TCA_MAX, NULL, extack); | |
1364 | if (err < 0) | |
1365 | return err; | |
1366 | ||
1367 | t = nlmsg_data(n); | |
1368 | protocol = TC_H_MIN(t->tcm_info); | |
1369 | prio = TC_H_MAJ(t->tcm_info); | |
1370 | parent = t->tcm_parent; | |
1371 | ||
1372 | if (prio == 0 && (protocol || t->tcm_handle || tca[TCA_KIND])) { | |
1373 | NL_SET_ERR_MSG(extack, "Cannot flush filters with protocol, handle or kind set"); | |
1374 | return -ENOENT; | |
1375 | } | |
1376 | ||
1377 | /* Find head of filter chain. */ | |
1378 | ||
1379 | block = tcf_block_find(net, &q, &parent, &cl, | |
1380 | t->tcm_ifindex, t->tcm_block_index, extack); | |
1381 | if (IS_ERR(block)) { | |
1382 | err = PTR_ERR(block); | |
1383 | goto errout; | |
1384 | } | |
1385 | ||
1386 | chain_index = tca[TCA_CHAIN] ? nla_get_u32(tca[TCA_CHAIN]) : 0; | |
1387 | if (chain_index > TC_ACT_EXT_VAL_MASK) { | |
1388 | NL_SET_ERR_MSG(extack, "Specified chain index exceeds upper limit"); | |
1389 | err = -EINVAL; | |
1390 | goto errout; | |
1391 | } | |
1392 | chain = tcf_chain_get(block, chain_index, false); | |
1393 | if (!chain) { | |
1394 | NL_SET_ERR_MSG(extack, "Cannot find specified filter chain"); | |
1395 | err = -EINVAL; | |
1396 | goto errout; | |
1397 | } | |
1398 | ||
1399 | if (prio == 0) { | |
1400 | tfilter_notify_chain(net, skb, block, q, parent, n, | |
1401 | chain, RTM_DELTFILTER); | |
1402 | tcf_chain_flush(chain); | |
1403 | err = 0; | |
1404 | goto errout; | |
1405 | } | |
1406 | ||
1407 | tp = tcf_chain_tp_find(chain, &chain_info, protocol, | |
1408 | prio, false); | |
1409 | if (!tp || IS_ERR(tp)) { | |
1410 | NL_SET_ERR_MSG(extack, "Filter with specified priority/protocol not found"); | |
0e399035 | 1411 | err = tp ? PTR_ERR(tp) : -ENOENT; |
c431f89b VB |
1412 | goto errout; |
1413 | } else if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], tp->ops->kind)) { | |
1414 | NL_SET_ERR_MSG(extack, "Specified filter kind does not match existing one"); | |
1415 | err = -EINVAL; | |
1416 | goto errout; | |
1417 | } | |
1418 | ||
1419 | fh = tp->ops->get(tp, t->tcm_handle); | |
1420 | ||
1421 | if (!fh) { | |
1422 | if (t->tcm_handle == 0) { | |
1423 | tcf_chain_tp_remove(chain, &chain_info, tp); | |
1424 | tfilter_notify(net, skb, n, tp, block, q, parent, fh, | |
1425 | RTM_DELTFILTER, false); | |
1426 | tcf_proto_destroy(tp, extack); | |
1427 | err = 0; | |
1428 | } else { | |
1429 | NL_SET_ERR_MSG(extack, "Specified filter handle not found"); | |
1430 | err = -ENOENT; | |
1431 | } | |
1432 | } else { | |
1433 | bool last; | |
1434 | ||
1435 | err = tfilter_del_notify(net, skb, n, tp, block, | |
1436 | q, parent, fh, false, &last, | |
1437 | extack); | |
1438 | if (err) | |
1439 | goto errout; | |
1440 | if (last) { | |
1441 | tcf_chain_tp_remove(chain, &chain_info, tp); | |
1442 | tcf_proto_destroy(tp, extack); | |
1443 | } | |
1444 | } | |
1445 | ||
1446 | errout: | |
1447 | if (chain) | |
1448 | tcf_chain_put(chain); | |
1449 | return err; | |
1450 | } | |
1451 | ||
1452 | static int tc_get_tfilter(struct sk_buff *skb, struct nlmsghdr *n, | |
1453 | struct netlink_ext_ack *extack) | |
1454 | { | |
1455 | struct net *net = sock_net(skb->sk); | |
1456 | struct nlattr *tca[TCA_MAX + 1]; | |
1457 | struct tcmsg *t; | |
1458 | u32 protocol; | |
1459 | u32 prio; | |
1460 | u32 parent; | |
1461 | u32 chain_index; | |
1462 | struct Qdisc *q = NULL; | |
1463 | struct tcf_chain_info chain_info; | |
1464 | struct tcf_chain *chain = NULL; | |
1465 | struct tcf_block *block; | |
1466 | struct tcf_proto *tp = NULL; | |
1467 | unsigned long cl = 0; | |
1468 | void *fh = NULL; | |
1469 | int err; | |
1470 | ||
1471 | err = nlmsg_parse(n, sizeof(*t), tca, TCA_MAX, NULL, extack); | |
1472 | if (err < 0) | |
1473 | return err; | |
1474 | ||
1475 | t = nlmsg_data(n); | |
1476 | protocol = TC_H_MIN(t->tcm_info); | |
1477 | prio = TC_H_MAJ(t->tcm_info); | |
1478 | parent = t->tcm_parent; | |
1479 | ||
1480 | if (prio == 0) { | |
1481 | NL_SET_ERR_MSG(extack, "Invalid filter command with priority of zero"); | |
1482 | return -ENOENT; | |
1483 | } | |
1484 | ||
1485 | /* Find head of filter chain. */ | |
1486 | ||
1487 | block = tcf_block_find(net, &q, &parent, &cl, | |
1488 | t->tcm_ifindex, t->tcm_block_index, extack); | |
1489 | if (IS_ERR(block)) { | |
1490 | err = PTR_ERR(block); | |
1491 | goto errout; | |
1492 | } | |
1493 | ||
1494 | chain_index = tca[TCA_CHAIN] ? nla_get_u32(tca[TCA_CHAIN]) : 0; | |
1495 | if (chain_index > TC_ACT_EXT_VAL_MASK) { | |
1496 | NL_SET_ERR_MSG(extack, "Specified chain index exceeds upper limit"); | |
1497 | err = -EINVAL; | |
1498 | goto errout; | |
1499 | } | |
1500 | chain = tcf_chain_get(block, chain_index, false); | |
1501 | if (!chain) { | |
1502 | NL_SET_ERR_MSG(extack, "Cannot find specified filter chain"); | |
1503 | err = -EINVAL; | |
1504 | goto errout; | |
1505 | } | |
1506 | ||
1507 | tp = tcf_chain_tp_find(chain, &chain_info, protocol, | |
1508 | prio, false); | |
1509 | if (!tp || IS_ERR(tp)) { | |
1510 | NL_SET_ERR_MSG(extack, "Filter with specified priority/protocol not found"); | |
0e399035 | 1511 | err = tp ? PTR_ERR(tp) : -ENOENT; |
c431f89b VB |
1512 | goto errout; |
1513 | } else if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], tp->ops->kind)) { | |
1514 | NL_SET_ERR_MSG(extack, "Specified filter kind does not match existing one"); | |
1515 | err = -EINVAL; | |
1516 | goto errout; | |
1517 | } | |
1518 | ||
1519 | fh = tp->ops->get(tp, t->tcm_handle); | |
1520 | ||
1521 | if (!fh) { | |
1522 | NL_SET_ERR_MSG(extack, "Specified filter handle not found"); | |
1523 | err = -ENOENT; | |
1524 | } else { | |
1525 | err = tfilter_notify(net, skb, n, tp, block, q, parent, | |
1526 | fh, RTM_NEWTFILTER, true); | |
1527 | if (err < 0) | |
1528 | NL_SET_ERR_MSG(extack, "Failed to send filter notify message"); | |
1529 | } | |
1530 | ||
1531 | errout: | |
1532 | if (chain) | |
1533 | tcf_chain_put(chain); | |
1534 | return err; | |
1535 | } | |
1536 | ||
aa767bfe | 1537 | struct tcf_dump_args { |
1da177e4 LT |
1538 | struct tcf_walker w; |
1539 | struct sk_buff *skb; | |
1540 | struct netlink_callback *cb; | |
7960d1da | 1541 | struct tcf_block *block; |
a10fa201 JP |
1542 | struct Qdisc *q; |
1543 | u32 parent; | |
1da177e4 LT |
1544 | }; |
1545 | ||
8113c095 | 1546 | static int tcf_node_dump(struct tcf_proto *tp, void *n, struct tcf_walker *arg) |
1da177e4 | 1547 | { |
aa767bfe | 1548 | struct tcf_dump_args *a = (void *)arg; |
832d1d5b | 1549 | struct net *net = sock_net(a->skb->sk); |
1da177e4 | 1550 | |
7960d1da | 1551 | return tcf_fill_node(net, a->skb, tp, a->block, a->q, a->parent, |
a10fa201 | 1552 | n, NETLINK_CB(a->cb->skb).portid, |
5a7a5555 JHS |
1553 | a->cb->nlh->nlmsg_seq, NLM_F_MULTI, |
1554 | RTM_NEWTFILTER); | |
1da177e4 LT |
1555 | } |
1556 | ||
a10fa201 JP |
1557 | static bool tcf_chain_dump(struct tcf_chain *chain, struct Qdisc *q, u32 parent, |
1558 | struct sk_buff *skb, struct netlink_callback *cb, | |
acb31fae JP |
1559 | long index_start, long *p_index) |
1560 | { | |
1561 | struct net *net = sock_net(skb->sk); | |
7960d1da | 1562 | struct tcf_block *block = chain->block; |
acb31fae JP |
1563 | struct tcmsg *tcm = nlmsg_data(cb->nlh); |
1564 | struct tcf_dump_args arg; | |
1565 | struct tcf_proto *tp; | |
1566 | ||
1567 | for (tp = rtnl_dereference(chain->filter_chain); | |
1568 | tp; tp = rtnl_dereference(tp->next), (*p_index)++) { | |
1569 | if (*p_index < index_start) | |
1570 | continue; | |
1571 | if (TC_H_MAJ(tcm->tcm_info) && | |
1572 | TC_H_MAJ(tcm->tcm_info) != tp->prio) | |
1573 | continue; | |
1574 | if (TC_H_MIN(tcm->tcm_info) && | |
1575 | TC_H_MIN(tcm->tcm_info) != tp->protocol) | |
1576 | continue; | |
1577 | if (*p_index > index_start) | |
1578 | memset(&cb->args[1], 0, | |
1579 | sizeof(cb->args) - sizeof(cb->args[0])); | |
1580 | if (cb->args[1] == 0) { | |
53189183 | 1581 | if (tcf_fill_node(net, skb, tp, block, q, parent, NULL, |
acb31fae JP |
1582 | NETLINK_CB(cb->skb).portid, |
1583 | cb->nlh->nlmsg_seq, NLM_F_MULTI, | |
1584 | RTM_NEWTFILTER) <= 0) | |
5bc17018 | 1585 | return false; |
acb31fae JP |
1586 | |
1587 | cb->args[1] = 1; | |
1588 | } | |
1589 | if (!tp->ops->walk) | |
1590 | continue; | |
1591 | arg.w.fn = tcf_node_dump; | |
1592 | arg.skb = skb; | |
1593 | arg.cb = cb; | |
7960d1da | 1594 | arg.block = block; |
a10fa201 JP |
1595 | arg.q = q; |
1596 | arg.parent = parent; | |
acb31fae JP |
1597 | arg.w.stop = 0; |
1598 | arg.w.skip = cb->args[1] - 1; | |
1599 | arg.w.count = 0; | |
01683a14 | 1600 | arg.w.cookie = cb->args[2]; |
acb31fae | 1601 | tp->ops->walk(tp, &arg.w); |
01683a14 | 1602 | cb->args[2] = arg.w.cookie; |
acb31fae JP |
1603 | cb->args[1] = arg.w.count + 1; |
1604 | if (arg.w.stop) | |
5bc17018 | 1605 | return false; |
acb31fae | 1606 | } |
5bc17018 | 1607 | return true; |
acb31fae JP |
1608 | } |
1609 | ||
bd27a875 | 1610 | /* called with RTNL */ |
1da177e4 LT |
1611 | static int tc_dump_tfilter(struct sk_buff *skb, struct netlink_callback *cb) |
1612 | { | |
3b1e0a65 | 1613 | struct net *net = sock_net(skb->sk); |
5bc17018 | 1614 | struct nlattr *tca[TCA_MAX + 1]; |
7960d1da | 1615 | struct Qdisc *q = NULL; |
6529eaba | 1616 | struct tcf_block *block; |
2190d1d0 | 1617 | struct tcf_chain *chain; |
942b8165 | 1618 | struct tcmsg *tcm = nlmsg_data(cb->nlh); |
acb31fae JP |
1619 | long index_start; |
1620 | long index; | |
a10fa201 | 1621 | u32 parent; |
5bc17018 | 1622 | int err; |
1da177e4 | 1623 | |
573ce260 | 1624 | if (nlmsg_len(cb->nlh) < sizeof(*tcm)) |
1da177e4 | 1625 | return skb->len; |
5bc17018 JP |
1626 | |
1627 | err = nlmsg_parse(cb->nlh, sizeof(*tcm), tca, TCA_MAX, NULL, NULL); | |
1628 | if (err) | |
1629 | return err; | |
1630 | ||
7960d1da JP |
1631 | if (tcm->tcm_ifindex == TCM_IFINDEX_MAGIC_BLOCK) { |
1632 | block = tcf_block_lookup(net, tcm->tcm_block_index); | |
1633 | if (!block) | |
1634 | goto out; | |
d680b352 JP |
1635 | /* If we work with block index, q is NULL and parent value |
1636 | * will never be used in the following code. The check | |
1637 | * in tcf_fill_node prevents it. However, compiler does not | |
1638 | * see that far, so set parent to zero to silence the warning | |
1639 | * about parent being uninitialized. | |
1640 | */ | |
1641 | parent = 0; | |
a10fa201 | 1642 | } else { |
7960d1da JP |
1643 | const struct Qdisc_class_ops *cops; |
1644 | struct net_device *dev; | |
1645 | unsigned long cl = 0; | |
1646 | ||
1647 | dev = __dev_get_by_index(net, tcm->tcm_ifindex); | |
1648 | if (!dev) | |
1649 | return skb->len; | |
1650 | ||
1651 | parent = tcm->tcm_parent; | |
1652 | if (!parent) { | |
1653 | q = dev->qdisc; | |
1654 | parent = q->handle; | |
1655 | } else { | |
1656 | q = qdisc_lookup(dev, TC_H_MAJ(tcm->tcm_parent)); | |
1657 | } | |
1658 | if (!q) | |
1659 | goto out; | |
1660 | cops = q->ops->cl_ops; | |
1661 | if (!cops) | |
143976ce | 1662 | goto out; |
7960d1da JP |
1663 | if (!cops->tcf_block) |
1664 | goto out; | |
1665 | if (TC_H_MIN(tcm->tcm_parent)) { | |
1666 | cl = cops->find(q, tcm->tcm_parent); | |
1667 | if (cl == 0) | |
1668 | goto out; | |
1669 | } | |
1670 | block = cops->tcf_block(q, cl, NULL); | |
1671 | if (!block) | |
1672 | goto out; | |
1673 | if (tcf_block_shared(block)) | |
1674 | q = NULL; | |
1da177e4 | 1675 | } |
1da177e4 | 1676 | |
acb31fae JP |
1677 | index_start = cb->args[0]; |
1678 | index = 0; | |
5bc17018 JP |
1679 | |
1680 | list_for_each_entry(chain, &block->chain_list, list) { | |
1681 | if (tca[TCA_CHAIN] && | |
1682 | nla_get_u32(tca[TCA_CHAIN]) != chain->index) | |
1683 | continue; | |
a10fa201 | 1684 | if (!tcf_chain_dump(chain, q, parent, skb, cb, |
5ae437ad RK |
1685 | index_start, &index)) { |
1686 | err = -EMSGSIZE; | |
5bc17018 | 1687 | break; |
5ae437ad | 1688 | } |
5bc17018 JP |
1689 | } |
1690 | ||
acb31fae | 1691 | cb->args[0] = index; |
1da177e4 | 1692 | |
1da177e4 | 1693 | out: |
5ae437ad RK |
1694 | /* If we did no progress, the error (EMSGSIZE) is real */ |
1695 | if (skb->len == 0 && err) | |
1696 | return err; | |
1da177e4 LT |
1697 | return skb->len; |
1698 | } | |
1699 | ||
32a4f5ec JP |
1700 | static int tc_chain_fill_node(struct tcf_chain *chain, struct net *net, |
1701 | struct sk_buff *skb, struct tcf_block *block, | |
1702 | u32 portid, u32 seq, u16 flags, int event) | |
1703 | { | |
1704 | unsigned char *b = skb_tail_pointer(skb); | |
9f407f17 | 1705 | const struct tcf_proto_ops *ops; |
32a4f5ec JP |
1706 | struct nlmsghdr *nlh; |
1707 | struct tcmsg *tcm; | |
9f407f17 JP |
1708 | void *priv; |
1709 | ||
1710 | ops = chain->tmplt_ops; | |
1711 | priv = chain->tmplt_priv; | |
32a4f5ec JP |
1712 | |
1713 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags); | |
1714 | if (!nlh) | |
1715 | goto out_nlmsg_trim; | |
1716 | tcm = nlmsg_data(nlh); | |
1717 | tcm->tcm_family = AF_UNSPEC; | |
1718 | tcm->tcm__pad1 = 0; | |
1719 | tcm->tcm__pad2 = 0; | |
1720 | tcm->tcm_handle = 0; | |
1721 | if (block->q) { | |
1722 | tcm->tcm_ifindex = qdisc_dev(block->q)->ifindex; | |
1723 | tcm->tcm_parent = block->q->handle; | |
1724 | } else { | |
1725 | tcm->tcm_ifindex = TCM_IFINDEX_MAGIC_BLOCK; | |
1726 | tcm->tcm_block_index = block->index; | |
1727 | } | |
1728 | ||
1729 | if (nla_put_u32(skb, TCA_CHAIN, chain->index)) | |
1730 | goto nla_put_failure; | |
1731 | ||
9f407f17 JP |
1732 | if (ops) { |
1733 | if (nla_put_string(skb, TCA_KIND, ops->kind)) | |
1734 | goto nla_put_failure; | |
1735 | if (ops->tmplt_dump(skb, net, priv) < 0) | |
1736 | goto nla_put_failure; | |
1737 | } | |
1738 | ||
32a4f5ec JP |
1739 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1740 | return skb->len; | |
1741 | ||
1742 | out_nlmsg_trim: | |
1743 | nla_put_failure: | |
1744 | nlmsg_trim(skb, b); | |
1745 | return -EMSGSIZE; | |
1746 | } | |
1747 | ||
1748 | static int tc_chain_notify(struct tcf_chain *chain, struct sk_buff *oskb, | |
1749 | u32 seq, u16 flags, int event, bool unicast) | |
1750 | { | |
1751 | u32 portid = oskb ? NETLINK_CB(oskb).portid : 0; | |
1752 | struct tcf_block *block = chain->block; | |
1753 | struct net *net = block->net; | |
1754 | struct sk_buff *skb; | |
1755 | ||
1756 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
1757 | if (!skb) | |
1758 | return -ENOBUFS; | |
1759 | ||
1760 | if (tc_chain_fill_node(chain, net, skb, block, portid, | |
1761 | seq, flags, event) <= 0) { | |
1762 | kfree_skb(skb); | |
1763 | return -EINVAL; | |
1764 | } | |
1765 | ||
1766 | if (unicast) | |
1767 | return netlink_unicast(net->rtnl, skb, portid, MSG_DONTWAIT); | |
1768 | ||
1769 | return rtnetlink_send(skb, net, portid, RTNLGRP_TC, flags & NLM_F_ECHO); | |
1770 | } | |
1771 | ||
9f407f17 JP |
1772 | static int tc_chain_tmplt_add(struct tcf_chain *chain, struct net *net, |
1773 | struct nlattr **tca, | |
1774 | struct netlink_ext_ack *extack) | |
1775 | { | |
1776 | const struct tcf_proto_ops *ops; | |
1777 | void *tmplt_priv; | |
1778 | ||
1779 | /* If kind is not set, user did not specify template. */ | |
1780 | if (!tca[TCA_KIND]) | |
1781 | return 0; | |
1782 | ||
1783 | ops = tcf_proto_lookup_ops(nla_data(tca[TCA_KIND]), extack); | |
1784 | if (IS_ERR(ops)) | |
1785 | return PTR_ERR(ops); | |
1786 | if (!ops->tmplt_create || !ops->tmplt_destroy || !ops->tmplt_dump) { | |
1787 | NL_SET_ERR_MSG(extack, "Chain templates are not supported with specified classifier"); | |
1788 | return -EOPNOTSUPP; | |
1789 | } | |
1790 | ||
1791 | tmplt_priv = ops->tmplt_create(net, chain, tca, extack); | |
1792 | if (IS_ERR(tmplt_priv)) { | |
1793 | module_put(ops->owner); | |
1794 | return PTR_ERR(tmplt_priv); | |
1795 | } | |
1796 | chain->tmplt_ops = ops; | |
1797 | chain->tmplt_priv = tmplt_priv; | |
1798 | return 0; | |
1799 | } | |
1800 | ||
1801 | static void tc_chain_tmplt_del(struct tcf_chain *chain) | |
1802 | { | |
1803 | const struct tcf_proto_ops *ops = chain->tmplt_ops; | |
1804 | ||
1805 | /* If template ops are set, no work to do for us. */ | |
1806 | if (!ops) | |
1807 | return; | |
1808 | ||
1809 | ops->tmplt_destroy(chain->tmplt_priv); | |
1810 | module_put(ops->owner); | |
1811 | } | |
1812 | ||
32a4f5ec JP |
1813 | /* Add/delete/get a chain */ |
1814 | ||
1815 | static int tc_ctl_chain(struct sk_buff *skb, struct nlmsghdr *n, | |
1816 | struct netlink_ext_ack *extack) | |
1817 | { | |
1818 | struct net *net = sock_net(skb->sk); | |
1819 | struct nlattr *tca[TCA_MAX + 1]; | |
1820 | struct tcmsg *t; | |
1821 | u32 parent; | |
1822 | u32 chain_index; | |
1823 | struct Qdisc *q = NULL; | |
1824 | struct tcf_chain *chain = NULL; | |
1825 | struct tcf_block *block; | |
1826 | unsigned long cl; | |
1827 | int err; | |
1828 | ||
1829 | if (n->nlmsg_type != RTM_GETCHAIN && | |
1830 | !netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)) | |
1831 | return -EPERM; | |
1832 | ||
1833 | replay: | |
1834 | err = nlmsg_parse(n, sizeof(*t), tca, TCA_MAX, NULL, extack); | |
1835 | if (err < 0) | |
1836 | return err; | |
1837 | ||
1838 | t = nlmsg_data(n); | |
1839 | parent = t->tcm_parent; | |
1840 | cl = 0; | |
1841 | ||
1842 | block = tcf_block_find(net, &q, &parent, &cl, | |
1843 | t->tcm_ifindex, t->tcm_block_index, extack); | |
1844 | if (IS_ERR(block)) | |
1845 | return PTR_ERR(block); | |
1846 | ||
1847 | chain_index = tca[TCA_CHAIN] ? nla_get_u32(tca[TCA_CHAIN]) : 0; | |
1848 | if (chain_index > TC_ACT_EXT_VAL_MASK) { | |
1849 | NL_SET_ERR_MSG(extack, "Specified chain index exceeds upper limit"); | |
1850 | return -EINVAL; | |
1851 | } | |
1852 | chain = tcf_chain_lookup(block, chain_index); | |
1853 | if (n->nlmsg_type == RTM_NEWCHAIN) { | |
1854 | if (chain) { | |
3d32f4c5 | 1855 | if (tcf_chain_held_by_acts_only(chain)) { |
1f3ed383 | 1856 | /* The chain exists only because there is |
3d32f4c5 | 1857 | * some action referencing it. |
1f3ed383 JP |
1858 | */ |
1859 | tcf_chain_hold(chain); | |
1860 | } else { | |
1861 | NL_SET_ERR_MSG(extack, "Filter chain already exists"); | |
1862 | return -EEXIST; | |
1863 | } | |
1864 | } else { | |
1865 | if (!(n->nlmsg_flags & NLM_F_CREATE)) { | |
1866 | NL_SET_ERR_MSG(extack, "Need both RTM_NEWCHAIN and NLM_F_CREATE to create a new chain"); | |
1867 | return -ENOENT; | |
1868 | } | |
1869 | chain = tcf_chain_create(block, chain_index); | |
1870 | if (!chain) { | |
1871 | NL_SET_ERR_MSG(extack, "Failed to create filter chain"); | |
1872 | return -ENOMEM; | |
1873 | } | |
32a4f5ec JP |
1874 | } |
1875 | } else { | |
3d32f4c5 | 1876 | if (!chain || tcf_chain_held_by_acts_only(chain)) { |
32a4f5ec JP |
1877 | NL_SET_ERR_MSG(extack, "Cannot find specified filter chain"); |
1878 | return -EINVAL; | |
1879 | } | |
1880 | tcf_chain_hold(chain); | |
1881 | } | |
1882 | ||
1883 | switch (n->nlmsg_type) { | |
1884 | case RTM_NEWCHAIN: | |
9f407f17 JP |
1885 | err = tc_chain_tmplt_add(chain, net, tca, extack); |
1886 | if (err) | |
1887 | goto errout; | |
32a4f5ec JP |
1888 | /* In case the chain was successfully added, take a reference |
1889 | * to the chain. This ensures that an empty chain | |
1890 | * does not disappear at the end of this function. | |
1891 | */ | |
1892 | tcf_chain_hold(chain); | |
1893 | chain->explicitly_created = true; | |
1894 | tc_chain_notify(chain, NULL, 0, NLM_F_CREATE | NLM_F_EXCL, | |
1895 | RTM_NEWCHAIN, false); | |
1896 | break; | |
1897 | case RTM_DELCHAIN: | |
1898 | /* Flush the chain first as the user requested chain removal. */ | |
1899 | tcf_chain_flush(chain); | |
1900 | /* In case the chain was successfully deleted, put a reference | |
1901 | * to the chain previously taken during addition. | |
1902 | */ | |
1903 | tcf_chain_put_explicitly_created(chain); | |
c921d7db | 1904 | chain->explicitly_created = false; |
32a4f5ec JP |
1905 | break; |
1906 | case RTM_GETCHAIN: | |
32a4f5ec JP |
1907 | err = tc_chain_notify(chain, skb, n->nlmsg_seq, |
1908 | n->nlmsg_seq, n->nlmsg_type, true); | |
1909 | if (err < 0) | |
1910 | NL_SET_ERR_MSG(extack, "Failed to send chain notify message"); | |
1911 | break; | |
1912 | default: | |
1913 | err = -EOPNOTSUPP; | |
1914 | NL_SET_ERR_MSG(extack, "Unsupported message type"); | |
1915 | goto errout; | |
1916 | } | |
1917 | ||
1918 | errout: | |
1919 | tcf_chain_put(chain); | |
1920 | if (err == -EAGAIN) | |
1921 | /* Replay the request. */ | |
1922 | goto replay; | |
1923 | return err; | |
1924 | } | |
1925 | ||
1926 | /* called with RTNL */ | |
1927 | static int tc_dump_chain(struct sk_buff *skb, struct netlink_callback *cb) | |
1928 | { | |
1929 | struct net *net = sock_net(skb->sk); | |
1930 | struct nlattr *tca[TCA_MAX + 1]; | |
1931 | struct Qdisc *q = NULL; | |
1932 | struct tcf_block *block; | |
1933 | struct tcf_chain *chain; | |
1934 | struct tcmsg *tcm = nlmsg_data(cb->nlh); | |
1935 | long index_start; | |
1936 | long index; | |
1937 | u32 parent; | |
1938 | int err; | |
1939 | ||
1940 | if (nlmsg_len(cb->nlh) < sizeof(*tcm)) | |
1941 | return skb->len; | |
1942 | ||
1943 | err = nlmsg_parse(cb->nlh, sizeof(*tcm), tca, TCA_MAX, NULL, NULL); | |
1944 | if (err) | |
1945 | return err; | |
1946 | ||
1947 | if (tcm->tcm_ifindex == TCM_IFINDEX_MAGIC_BLOCK) { | |
1948 | block = tcf_block_lookup(net, tcm->tcm_block_index); | |
1949 | if (!block) | |
1950 | goto out; | |
1951 | /* If we work with block index, q is NULL and parent value | |
1952 | * will never be used in the following code. The check | |
1953 | * in tcf_fill_node prevents it. However, compiler does not | |
1954 | * see that far, so set parent to zero to silence the warning | |
1955 | * about parent being uninitialized. | |
1956 | */ | |
1957 | parent = 0; | |
1958 | } else { | |
1959 | const struct Qdisc_class_ops *cops; | |
1960 | struct net_device *dev; | |
1961 | unsigned long cl = 0; | |
1962 | ||
1963 | dev = __dev_get_by_index(net, tcm->tcm_ifindex); | |
1964 | if (!dev) | |
1965 | return skb->len; | |
1966 | ||
1967 | parent = tcm->tcm_parent; | |
1968 | if (!parent) { | |
1969 | q = dev->qdisc; | |
1970 | parent = q->handle; | |
1971 | } else { | |
1972 | q = qdisc_lookup(dev, TC_H_MAJ(tcm->tcm_parent)); | |
1973 | } | |
1974 | if (!q) | |
1975 | goto out; | |
1976 | cops = q->ops->cl_ops; | |
1977 | if (!cops) | |
1978 | goto out; | |
1979 | if (!cops->tcf_block) | |
1980 | goto out; | |
1981 | if (TC_H_MIN(tcm->tcm_parent)) { | |
1982 | cl = cops->find(q, tcm->tcm_parent); | |
1983 | if (cl == 0) | |
1984 | goto out; | |
1985 | } | |
1986 | block = cops->tcf_block(q, cl, NULL); | |
1987 | if (!block) | |
1988 | goto out; | |
1989 | if (tcf_block_shared(block)) | |
1990 | q = NULL; | |
1991 | } | |
1992 | ||
1993 | index_start = cb->args[0]; | |
1994 | index = 0; | |
1995 | ||
1996 | list_for_each_entry(chain, &block->chain_list, list) { | |
1997 | if ((tca[TCA_CHAIN] && | |
1998 | nla_get_u32(tca[TCA_CHAIN]) != chain->index)) | |
1999 | continue; | |
2000 | if (index < index_start) { | |
2001 | index++; | |
2002 | continue; | |
2003 | } | |
3d32f4c5 | 2004 | if (tcf_chain_held_by_acts_only(chain)) |
1f3ed383 | 2005 | continue; |
32a4f5ec JP |
2006 | err = tc_chain_fill_node(chain, net, skb, block, |
2007 | NETLINK_CB(cb->skb).portid, | |
2008 | cb->nlh->nlmsg_seq, NLM_F_MULTI, | |
2009 | RTM_NEWCHAIN); | |
2010 | if (err <= 0) | |
2011 | break; | |
2012 | index++; | |
2013 | } | |
2014 | ||
2015 | cb->args[0] = index; | |
2016 | ||
2017 | out: | |
2018 | /* If we did no progress, the error (EMSGSIZE) is real */ | |
2019 | if (skb->len == 0 && err) | |
2020 | return err; | |
2021 | return skb->len; | |
2022 | } | |
2023 | ||
18d0264f | 2024 | void tcf_exts_destroy(struct tcf_exts *exts) |
1da177e4 LT |
2025 | { |
2026 | #ifdef CONFIG_NET_CLS_ACT | |
90b73b77 | 2027 | tcf_action_destroy(exts->actions, TCA_ACT_UNBIND); |
22dc13c8 WC |
2028 | kfree(exts->actions); |
2029 | exts->nr_actions = 0; | |
1da177e4 LT |
2030 | #endif |
2031 | } | |
aa767bfe | 2032 | EXPORT_SYMBOL(tcf_exts_destroy); |
1da177e4 | 2033 | |
c1b52739 | 2034 | int tcf_exts_validate(struct net *net, struct tcf_proto *tp, struct nlattr **tb, |
50a56190 AA |
2035 | struct nlattr *rate_tlv, struct tcf_exts *exts, bool ovr, |
2036 | struct netlink_ext_ack *extack) | |
1da177e4 | 2037 | { |
1da177e4 LT |
2038 | #ifdef CONFIG_NET_CLS_ACT |
2039 | { | |
1da177e4 | 2040 | struct tc_action *act; |
d04e6990 | 2041 | size_t attr_size = 0; |
1da177e4 | 2042 | |
5da57f42 | 2043 | if (exts->police && tb[exts->police]) { |
9fb9f251 JP |
2044 | act = tcf_action_init_1(net, tp, tb[exts->police], |
2045 | rate_tlv, "police", ovr, | |
789871bb | 2046 | TCA_ACT_BIND, true, extack); |
ab27cfb8 PM |
2047 | if (IS_ERR(act)) |
2048 | return PTR_ERR(act); | |
1da177e4 | 2049 | |
33be6271 | 2050 | act->type = exts->type = TCA_OLD_COMPAT; |
22dc13c8 WC |
2051 | exts->actions[0] = act; |
2052 | exts->nr_actions = 1; | |
5da57f42 | 2053 | } else if (exts->action && tb[exts->action]) { |
90b73b77 | 2054 | int err; |
22dc13c8 | 2055 | |
9fb9f251 JP |
2056 | err = tcf_action_init(net, tp, tb[exts->action], |
2057 | rate_tlv, NULL, ovr, TCA_ACT_BIND, | |
90b73b77 | 2058 | exts->actions, &attr_size, true, |
789871bb | 2059 | extack); |
90b73b77 | 2060 | if (err < 0) |
33be6271 | 2061 | return err; |
90b73b77 | 2062 | exts->nr_actions = err; |
1da177e4 | 2063 | } |
e4b95c41 | 2064 | exts->net = net; |
1da177e4 | 2065 | } |
1da177e4 | 2066 | #else |
5da57f42 | 2067 | if ((exts->action && tb[exts->action]) || |
50a56190 AA |
2068 | (exts->police && tb[exts->police])) { |
2069 | NL_SET_ERR_MSG(extack, "Classifier actions are not supported per compile options (CONFIG_NET_CLS_ACT)"); | |
1da177e4 | 2070 | return -EOPNOTSUPP; |
50a56190 | 2071 | } |
1da177e4 LT |
2072 | #endif |
2073 | ||
2074 | return 0; | |
2075 | } | |
aa767bfe | 2076 | EXPORT_SYMBOL(tcf_exts_validate); |
1da177e4 | 2077 | |
9b0d4446 | 2078 | void tcf_exts_change(struct tcf_exts *dst, struct tcf_exts *src) |
1da177e4 LT |
2079 | { |
2080 | #ifdef CONFIG_NET_CLS_ACT | |
22dc13c8 WC |
2081 | struct tcf_exts old = *dst; |
2082 | ||
9b0d4446 | 2083 | *dst = *src; |
22dc13c8 | 2084 | tcf_exts_destroy(&old); |
1da177e4 LT |
2085 | #endif |
2086 | } | |
aa767bfe | 2087 | EXPORT_SYMBOL(tcf_exts_change); |
1da177e4 | 2088 | |
22dc13c8 WC |
2089 | #ifdef CONFIG_NET_CLS_ACT |
2090 | static struct tc_action *tcf_exts_first_act(struct tcf_exts *exts) | |
2091 | { | |
2092 | if (exts->nr_actions == 0) | |
2093 | return NULL; | |
2094 | else | |
2095 | return exts->actions[0]; | |
2096 | } | |
2097 | #endif | |
33be6271 | 2098 | |
5da57f42 | 2099 | int tcf_exts_dump(struct sk_buff *skb, struct tcf_exts *exts) |
1da177e4 LT |
2100 | { |
2101 | #ifdef CONFIG_NET_CLS_ACT | |
9cc63db5 CW |
2102 | struct nlattr *nest; |
2103 | ||
978dfd8d | 2104 | if (exts->action && tcf_exts_has_actions(exts)) { |
1da177e4 LT |
2105 | /* |
2106 | * again for backward compatible mode - we want | |
2107 | * to work with both old and new modes of entering | |
2108 | * tc data even if iproute2 was newer - jhs | |
2109 | */ | |
33be6271 | 2110 | if (exts->type != TCA_OLD_COMPAT) { |
5da57f42 | 2111 | nest = nla_nest_start(skb, exts->action); |
4b3550ef PM |
2112 | if (nest == NULL) |
2113 | goto nla_put_failure; | |
22dc13c8 | 2114 | |
90b73b77 | 2115 | if (tcf_action_dump(skb, exts->actions, 0, 0) < 0) |
add93b61 | 2116 | goto nla_put_failure; |
4b3550ef | 2117 | nla_nest_end(skb, nest); |
5da57f42 | 2118 | } else if (exts->police) { |
33be6271 | 2119 | struct tc_action *act = tcf_exts_first_act(exts); |
5da57f42 | 2120 | nest = nla_nest_start(skb, exts->police); |
63acd680 | 2121 | if (nest == NULL || !act) |
4b3550ef | 2122 | goto nla_put_failure; |
33be6271 | 2123 | if (tcf_action_dump_old(skb, act, 0, 0) < 0) |
add93b61 | 2124 | goto nla_put_failure; |
4b3550ef | 2125 | nla_nest_end(skb, nest); |
1da177e4 LT |
2126 | } |
2127 | } | |
1da177e4 | 2128 | return 0; |
9cc63db5 CW |
2129 | |
2130 | nla_put_failure: | |
2131 | nla_nest_cancel(skb, nest); | |
1da177e4 | 2132 | return -1; |
9cc63db5 CW |
2133 | #else |
2134 | return 0; | |
2135 | #endif | |
1da177e4 | 2136 | } |
aa767bfe | 2137 | EXPORT_SYMBOL(tcf_exts_dump); |
1da177e4 | 2138 | |
aa767bfe | 2139 | |
5da57f42 | 2140 | int tcf_exts_dump_stats(struct sk_buff *skb, struct tcf_exts *exts) |
1da177e4 LT |
2141 | { |
2142 | #ifdef CONFIG_NET_CLS_ACT | |
33be6271 | 2143 | struct tc_action *a = tcf_exts_first_act(exts); |
b057df24 | 2144 | if (a != NULL && tcf_action_copy_stats(skb, a, 1) < 0) |
33be6271 | 2145 | return -1; |
1da177e4 LT |
2146 | #endif |
2147 | return 0; | |
1da177e4 | 2148 | } |
aa767bfe | 2149 | EXPORT_SYMBOL(tcf_exts_dump_stats); |
1da177e4 | 2150 | |
717503b9 JP |
2151 | static int tc_exts_setup_cb_egdev_call(struct tcf_exts *exts, |
2152 | enum tc_setup_type type, | |
2153 | void *type_data, bool err_stop) | |
b3f55bdd JP |
2154 | { |
2155 | int ok_count = 0; | |
2156 | #ifdef CONFIG_NET_CLS_ACT | |
2157 | const struct tc_action *a; | |
2158 | struct net_device *dev; | |
9d452ceb | 2159 | int i, ret; |
b3f55bdd JP |
2160 | |
2161 | if (!tcf_exts_has_actions(exts)) | |
2162 | return 0; | |
2163 | ||
9d452ceb OG |
2164 | for (i = 0; i < exts->nr_actions; i++) { |
2165 | a = exts->actions[i]; | |
b3f55bdd JP |
2166 | if (!a->ops->get_dev) |
2167 | continue; | |
2168 | dev = a->ops->get_dev(a); | |
7612fb03 | 2169 | if (!dev) |
b3f55bdd JP |
2170 | continue; |
2171 | ret = tc_setup_cb_egdev_call(dev, type, type_data, err_stop); | |
2172 | if (ret < 0) | |
2173 | return ret; | |
2174 | ok_count += ret; | |
2175 | } | |
2176 | #endif | |
2177 | return ok_count; | |
2178 | } | |
717503b9 | 2179 | |
208c0f4b JP |
2180 | int tc_setup_cb_call(struct tcf_block *block, struct tcf_exts *exts, |
2181 | enum tc_setup_type type, void *type_data, bool err_stop) | |
717503b9 | 2182 | { |
9a99dc1c | 2183 | int ok_count; |
208c0f4b JP |
2184 | int ret; |
2185 | ||
9a99dc1c DM |
2186 | ret = tcf_block_cb_call(block, type, type_data, err_stop); |
2187 | if (ret < 0) | |
2188 | return ret; | |
2189 | ok_count = ret; | |
208c0f4b | 2190 | |
f8f4bef3 | 2191 | if (!exts || ok_count) |
9a99dc1c | 2192 | return ok_count; |
208c0f4b JP |
2193 | ret = tc_exts_setup_cb_egdev_call(exts, type, type_data, err_stop); |
2194 | if (ret < 0) | |
2195 | return ret; | |
2196 | ok_count += ret; | |
2197 | ||
2198 | return ok_count; | |
717503b9 JP |
2199 | } |
2200 | EXPORT_SYMBOL(tc_setup_cb_call); | |
b3f55bdd | 2201 | |
48617387 JP |
2202 | static __net_init int tcf_net_init(struct net *net) |
2203 | { | |
2204 | struct tcf_net *tn = net_generic(net, tcf_net_id); | |
2205 | ||
2206 | idr_init(&tn->idr); | |
2207 | return 0; | |
2208 | } | |
2209 | ||
2210 | static void __net_exit tcf_net_exit(struct net *net) | |
2211 | { | |
2212 | struct tcf_net *tn = net_generic(net, tcf_net_id); | |
2213 | ||
2214 | idr_destroy(&tn->idr); | |
2215 | } | |
2216 | ||
2217 | static struct pernet_operations tcf_net_ops = { | |
2218 | .init = tcf_net_init, | |
2219 | .exit = tcf_net_exit, | |
2220 | .id = &tcf_net_id, | |
2221 | .size = sizeof(struct tcf_net), | |
2222 | }; | |
2223 | ||
1da177e4 LT |
2224 | static int __init tc_filter_init(void) |
2225 | { | |
48617387 JP |
2226 | int err; |
2227 | ||
7aa0045d CW |
2228 | tc_filter_wq = alloc_ordered_workqueue("tc_filter_workqueue", 0); |
2229 | if (!tc_filter_wq) | |
2230 | return -ENOMEM; | |
2231 | ||
48617387 JP |
2232 | err = register_pernet_subsys(&tcf_net_ops); |
2233 | if (err) | |
2234 | goto err_register_pernet_subsys; | |
2235 | ||
c431f89b VB |
2236 | rtnl_register(PF_UNSPEC, RTM_NEWTFILTER, tc_new_tfilter, NULL, 0); |
2237 | rtnl_register(PF_UNSPEC, RTM_DELTFILTER, tc_del_tfilter, NULL, 0); | |
2238 | rtnl_register(PF_UNSPEC, RTM_GETTFILTER, tc_get_tfilter, | |
b97bac64 | 2239 | tc_dump_tfilter, 0); |
32a4f5ec JP |
2240 | rtnl_register(PF_UNSPEC, RTM_NEWCHAIN, tc_ctl_chain, NULL, 0); |
2241 | rtnl_register(PF_UNSPEC, RTM_DELCHAIN, tc_ctl_chain, NULL, 0); | |
2242 | rtnl_register(PF_UNSPEC, RTM_GETCHAIN, tc_ctl_chain, | |
2243 | tc_dump_chain, 0); | |
1da177e4 | 2244 | |
1da177e4 | 2245 | return 0; |
48617387 JP |
2246 | |
2247 | err_register_pernet_subsys: | |
2248 | destroy_workqueue(tc_filter_wq); | |
2249 | return err; | |
1da177e4 LT |
2250 | } |
2251 | ||
2252 | subsys_initcall(tc_filter_init); |