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