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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 | ||
367a8ce8 WC |
265 | struct tcf_chain *tcf_chain_get(struct tcf_block *block, u32 chain_index, |
266 | bool create) | |
5bc17018 JP |
267 | { |
268 | struct tcf_chain *chain; | |
269 | ||
270 | list_for_each_entry(chain, &block->chain_list, list) { | |
e2ef7544 CW |
271 | if (chain->index == chain_index) { |
272 | tcf_chain_hold(chain); | |
273 | return chain; | |
274 | } | |
5bc17018 | 275 | } |
80532384 | 276 | |
e2ef7544 | 277 | return create ? tcf_chain_create(block, chain_index) : NULL; |
5bc17018 JP |
278 | } |
279 | EXPORT_SYMBOL(tcf_chain_get); | |
280 | ||
281 | void tcf_chain_put(struct tcf_chain *chain) | |
282 | { | |
e2ef7544 | 283 | if (--chain->refcnt == 0) |
5bc17018 JP |
284 | tcf_chain_destroy(chain); |
285 | } | |
286 | EXPORT_SYMBOL(tcf_chain_put); | |
287 | ||
caa72601 JP |
288 | static bool tcf_block_offload_in_use(struct tcf_block *block) |
289 | { | |
290 | return block->offloadcnt; | |
291 | } | |
292 | ||
293 | static int tcf_block_offload_cmd(struct tcf_block *block, | |
294 | struct net_device *dev, | |
295 | struct tcf_block_ext_info *ei, | |
60513bd8 JH |
296 | enum tc_block_command command, |
297 | struct netlink_ext_ack *extack) | |
8c4083b3 | 298 | { |
8c4083b3 JP |
299 | struct tc_block_offload bo = {}; |
300 | ||
8c4083b3 JP |
301 | bo.command = command; |
302 | bo.binder_type = ei->binder_type; | |
303 | bo.block = block; | |
60513bd8 | 304 | bo.extack = extack; |
caa72601 | 305 | return dev->netdev_ops->ndo_setup_tc(dev, TC_SETUP_BLOCK, &bo); |
8c4083b3 JP |
306 | } |
307 | ||
caa72601 | 308 | static int tcf_block_offload_bind(struct tcf_block *block, struct Qdisc *q, |
60513bd8 JH |
309 | struct tcf_block_ext_info *ei, |
310 | struct netlink_ext_ack *extack) | |
8c4083b3 | 311 | { |
caa72601 JP |
312 | struct net_device *dev = q->dev_queue->dev; |
313 | int err; | |
314 | ||
315 | if (!dev->netdev_ops->ndo_setup_tc) | |
316 | goto no_offload_dev_inc; | |
317 | ||
318 | /* If tc offload feature is disabled and the block we try to bind | |
319 | * to already has some offloaded filters, forbid to bind. | |
320 | */ | |
60513bd8 JH |
321 | if (!tc_can_offload(dev) && tcf_block_offload_in_use(block)) { |
322 | NL_SET_ERR_MSG(extack, "Bind to offloaded block failed as dev has offload disabled"); | |
caa72601 | 323 | return -EOPNOTSUPP; |
60513bd8 | 324 | } |
caa72601 | 325 | |
60513bd8 | 326 | err = tcf_block_offload_cmd(block, dev, ei, TC_BLOCK_BIND, extack); |
caa72601 JP |
327 | if (err == -EOPNOTSUPP) |
328 | goto no_offload_dev_inc; | |
329 | return err; | |
330 | ||
331 | no_offload_dev_inc: | |
332 | if (tcf_block_offload_in_use(block)) | |
333 | return -EOPNOTSUPP; | |
334 | block->nooffloaddevcnt++; | |
335 | return 0; | |
8c4083b3 JP |
336 | } |
337 | ||
338 | static void tcf_block_offload_unbind(struct tcf_block *block, struct Qdisc *q, | |
339 | struct tcf_block_ext_info *ei) | |
340 | { | |
caa72601 JP |
341 | struct net_device *dev = q->dev_queue->dev; |
342 | int err; | |
343 | ||
344 | if (!dev->netdev_ops->ndo_setup_tc) | |
345 | goto no_offload_dev_dec; | |
60513bd8 | 346 | err = tcf_block_offload_cmd(block, dev, ei, TC_BLOCK_UNBIND, NULL); |
caa72601 JP |
347 | if (err == -EOPNOTSUPP) |
348 | goto no_offload_dev_dec; | |
349 | return; | |
350 | ||
351 | no_offload_dev_dec: | |
352 | WARN_ON(block->nooffloaddevcnt-- == 0); | |
8c4083b3 JP |
353 | } |
354 | ||
a9b19443 | 355 | static int |
f71e0ca4 JP |
356 | tcf_chain0_head_change_cb_add(struct tcf_block *block, |
357 | struct tcf_block_ext_info *ei, | |
358 | struct netlink_ext_ack *extack) | |
a9b19443 | 359 | { |
f71e0ca4 | 360 | struct tcf_chain *chain0 = block->chain0.chain; |
a9b19443 JP |
361 | struct tcf_filter_chain_list_item *item; |
362 | ||
363 | item = kmalloc(sizeof(*item), GFP_KERNEL); | |
364 | if (!item) { | |
365 | NL_SET_ERR_MSG(extack, "Memory allocation for head change callback item failed"); | |
366 | return -ENOMEM; | |
367 | } | |
368 | item->chain_head_change = ei->chain_head_change; | |
369 | item->chain_head_change_priv = ei->chain_head_change_priv; | |
f71e0ca4 JP |
370 | if (chain0 && chain0->filter_chain) |
371 | tcf_chain_head_change_item(item, chain0->filter_chain); | |
372 | list_add(&item->list, &block->chain0.filter_chain_list); | |
a9b19443 JP |
373 | return 0; |
374 | } | |
375 | ||
376 | static void | |
f71e0ca4 JP |
377 | tcf_chain0_head_change_cb_del(struct tcf_block *block, |
378 | struct tcf_block_ext_info *ei) | |
a9b19443 | 379 | { |
f71e0ca4 | 380 | struct tcf_chain *chain0 = block->chain0.chain; |
a9b19443 JP |
381 | struct tcf_filter_chain_list_item *item; |
382 | ||
f71e0ca4 | 383 | list_for_each_entry(item, &block->chain0.filter_chain_list, list) { |
a9b19443 JP |
384 | if ((!ei->chain_head_change && !ei->chain_head_change_priv) || |
385 | (item->chain_head_change == ei->chain_head_change && | |
386 | item->chain_head_change_priv == ei->chain_head_change_priv)) { | |
f71e0ca4 JP |
387 | if (chain0) |
388 | tcf_chain_head_change_item(item, NULL); | |
a9b19443 JP |
389 | list_del(&item->list); |
390 | kfree(item); | |
391 | return; | |
392 | } | |
393 | } | |
394 | WARN_ON(1); | |
395 | } | |
396 | ||
48617387 JP |
397 | struct tcf_net { |
398 | struct idr idr; | |
399 | }; | |
400 | ||
401 | static unsigned int tcf_net_id; | |
402 | ||
403 | static int tcf_block_insert(struct tcf_block *block, struct net *net, | |
bb047ddd | 404 | struct netlink_ext_ack *extack) |
a9b19443 | 405 | { |
48617387 | 406 | struct tcf_net *tn = net_generic(net, tcf_net_id); |
48617387 | 407 | |
bb047ddd JP |
408 | return idr_alloc_u32(&tn->idr, block, &block->index, block->index, |
409 | GFP_KERNEL); | |
a9b19443 JP |
410 | } |
411 | ||
48617387 JP |
412 | static void tcf_block_remove(struct tcf_block *block, struct net *net) |
413 | { | |
414 | struct tcf_net *tn = net_generic(net, tcf_net_id); | |
415 | ||
9c160941 | 416 | idr_remove(&tn->idr, block->index); |
48617387 JP |
417 | } |
418 | ||
419 | static struct tcf_block *tcf_block_create(struct net *net, struct Qdisc *q, | |
bb047ddd | 420 | u32 block_index, |
48617387 | 421 | struct netlink_ext_ack *extack) |
6529eaba | 422 | { |
48617387 | 423 | struct tcf_block *block; |
6529eaba | 424 | |
48617387 | 425 | block = kzalloc(sizeof(*block), GFP_KERNEL); |
8d1a77f9 AA |
426 | if (!block) { |
427 | NL_SET_ERR_MSG(extack, "Memory allocation for block failed"); | |
48617387 | 428 | return ERR_PTR(-ENOMEM); |
8d1a77f9 | 429 | } |
5bc17018 | 430 | INIT_LIST_HEAD(&block->chain_list); |
acb67442 | 431 | INIT_LIST_HEAD(&block->cb_list); |
f36fe1c4 | 432 | INIT_LIST_HEAD(&block->owner_list); |
f71e0ca4 | 433 | INIT_LIST_HEAD(&block->chain0.filter_chain_list); |
acb67442 | 434 | |
48617387 JP |
435 | block->refcnt = 1; |
436 | block->net = net; | |
bb047ddd JP |
437 | block->index = block_index; |
438 | ||
439 | /* Don't store q pointer for blocks which are shared */ | |
440 | if (!tcf_block_shared(block)) | |
441 | block->q = q; | |
48617387 | 442 | return block; |
48617387 JP |
443 | } |
444 | ||
445 | static struct tcf_block *tcf_block_lookup(struct net *net, u32 block_index) | |
446 | { | |
447 | struct tcf_net *tn = net_generic(net, tcf_net_id); | |
448 | ||
322d884b | 449 | return idr_find(&tn->idr, block_index); |
48617387 JP |
450 | } |
451 | ||
c431f89b VB |
452 | /* Find tcf block. |
453 | * Set q, parent, cl when appropriate. | |
454 | */ | |
455 | ||
456 | static struct tcf_block *tcf_block_find(struct net *net, struct Qdisc **q, | |
457 | u32 *parent, unsigned long *cl, | |
458 | int ifindex, u32 block_index, | |
459 | struct netlink_ext_ack *extack) | |
460 | { | |
461 | struct tcf_block *block; | |
462 | ||
463 | if (ifindex == TCM_IFINDEX_MAGIC_BLOCK) { | |
464 | block = tcf_block_lookup(net, block_index); | |
465 | if (!block) { | |
466 | NL_SET_ERR_MSG(extack, "Block of given index was not found"); | |
467 | return ERR_PTR(-EINVAL); | |
468 | } | |
469 | } else { | |
470 | const struct Qdisc_class_ops *cops; | |
471 | struct net_device *dev; | |
472 | ||
473 | /* Find link */ | |
474 | dev = __dev_get_by_index(net, ifindex); | |
475 | if (!dev) | |
476 | return ERR_PTR(-ENODEV); | |
477 | ||
478 | /* Find qdisc */ | |
479 | if (!*parent) { | |
480 | *q = dev->qdisc; | |
481 | *parent = (*q)->handle; | |
482 | } else { | |
483 | *q = qdisc_lookup(dev, TC_H_MAJ(*parent)); | |
484 | if (!*q) { | |
485 | NL_SET_ERR_MSG(extack, "Parent Qdisc doesn't exists"); | |
486 | return ERR_PTR(-EINVAL); | |
487 | } | |
488 | } | |
489 | ||
490 | /* Is it classful? */ | |
491 | cops = (*q)->ops->cl_ops; | |
492 | if (!cops) { | |
493 | NL_SET_ERR_MSG(extack, "Qdisc not classful"); | |
494 | return ERR_PTR(-EINVAL); | |
495 | } | |
496 | ||
497 | if (!cops->tcf_block) { | |
498 | NL_SET_ERR_MSG(extack, "Class doesn't support blocks"); | |
499 | return ERR_PTR(-EOPNOTSUPP); | |
500 | } | |
501 | ||
502 | /* Do we search for filter, attached to class? */ | |
503 | if (TC_H_MIN(*parent)) { | |
504 | *cl = cops->find(*q, *parent); | |
505 | if (*cl == 0) { | |
506 | NL_SET_ERR_MSG(extack, "Specified class doesn't exist"); | |
507 | return ERR_PTR(-ENOENT); | |
508 | } | |
509 | } | |
510 | ||
511 | /* And the last stroke */ | |
512 | block = cops->tcf_block(*q, *cl, extack); | |
513 | if (!block) | |
514 | return ERR_PTR(-EINVAL); | |
515 | if (tcf_block_shared(block)) { | |
516 | NL_SET_ERR_MSG(extack, "This filter block is shared. Please use the block index to manipulate the filters"); | |
517 | return ERR_PTR(-EOPNOTSUPP); | |
518 | } | |
519 | } | |
520 | ||
521 | return block; | |
522 | } | |
523 | ||
f36fe1c4 JP |
524 | struct tcf_block_owner_item { |
525 | struct list_head list; | |
526 | struct Qdisc *q; | |
527 | enum tcf_block_binder_type binder_type; | |
528 | }; | |
529 | ||
530 | static void | |
531 | tcf_block_owner_netif_keep_dst(struct tcf_block *block, | |
532 | struct Qdisc *q, | |
533 | enum tcf_block_binder_type binder_type) | |
534 | { | |
535 | if (block->keep_dst && | |
536 | binder_type != TCF_BLOCK_BINDER_TYPE_CLSACT_INGRESS && | |
537 | binder_type != TCF_BLOCK_BINDER_TYPE_CLSACT_EGRESS) | |
538 | netif_keep_dst(qdisc_dev(q)); | |
539 | } | |
540 | ||
541 | void tcf_block_netif_keep_dst(struct tcf_block *block) | |
542 | { | |
543 | struct tcf_block_owner_item *item; | |
544 | ||
545 | block->keep_dst = true; | |
546 | list_for_each_entry(item, &block->owner_list, list) | |
547 | tcf_block_owner_netif_keep_dst(block, item->q, | |
548 | item->binder_type); | |
549 | } | |
550 | EXPORT_SYMBOL(tcf_block_netif_keep_dst); | |
551 | ||
552 | static int tcf_block_owner_add(struct tcf_block *block, | |
553 | struct Qdisc *q, | |
554 | enum tcf_block_binder_type binder_type) | |
555 | { | |
556 | struct tcf_block_owner_item *item; | |
557 | ||
558 | item = kmalloc(sizeof(*item), GFP_KERNEL); | |
559 | if (!item) | |
560 | return -ENOMEM; | |
561 | item->q = q; | |
562 | item->binder_type = binder_type; | |
563 | list_add(&item->list, &block->owner_list); | |
564 | return 0; | |
565 | } | |
566 | ||
567 | static void tcf_block_owner_del(struct tcf_block *block, | |
568 | struct Qdisc *q, | |
569 | enum tcf_block_binder_type binder_type) | |
570 | { | |
571 | struct tcf_block_owner_item *item; | |
572 | ||
573 | list_for_each_entry(item, &block->owner_list, list) { | |
574 | if (item->q == q && item->binder_type == binder_type) { | |
575 | list_del(&item->list); | |
576 | kfree(item); | |
577 | return; | |
578 | } | |
579 | } | |
580 | WARN_ON(1); | |
581 | } | |
582 | ||
48617387 JP |
583 | int tcf_block_get_ext(struct tcf_block **p_block, struct Qdisc *q, |
584 | struct tcf_block_ext_info *ei, | |
585 | struct netlink_ext_ack *extack) | |
586 | { | |
587 | struct net *net = qdisc_net(q); | |
588 | struct tcf_block *block = NULL; | |
589 | bool created = false; | |
590 | int err; | |
591 | ||
592 | if (ei->block_index) { | |
593 | /* block_index not 0 means the shared block is requested */ | |
594 | block = tcf_block_lookup(net, ei->block_index); | |
595 | if (block) | |
596 | block->refcnt++; | |
597 | } | |
598 | ||
599 | if (!block) { | |
bb047ddd | 600 | block = tcf_block_create(net, q, ei->block_index, extack); |
48617387 JP |
601 | if (IS_ERR(block)) |
602 | return PTR_ERR(block); | |
603 | created = true; | |
bb047ddd JP |
604 | if (tcf_block_shared(block)) { |
605 | err = tcf_block_insert(block, net, extack); | |
48617387 JP |
606 | if (err) |
607 | goto err_block_insert; | |
608 | } | |
609 | } | |
610 | ||
f36fe1c4 JP |
611 | err = tcf_block_owner_add(block, q, ei->binder_type); |
612 | if (err) | |
613 | goto err_block_owner_add; | |
614 | ||
615 | tcf_block_owner_netif_keep_dst(block, q, ei->binder_type); | |
616 | ||
f71e0ca4 | 617 | err = tcf_chain0_head_change_cb_add(block, ei, extack); |
a9b19443 | 618 | if (err) |
f71e0ca4 | 619 | goto err_chain0_head_change_cb_add; |
caa72601 | 620 | |
60513bd8 | 621 | err = tcf_block_offload_bind(block, q, ei, extack); |
caa72601 JP |
622 | if (err) |
623 | goto err_block_offload_bind; | |
624 | ||
6529eaba JP |
625 | *p_block = block; |
626 | return 0; | |
2190d1d0 | 627 | |
caa72601 | 628 | err_block_offload_bind: |
f71e0ca4 JP |
629 | tcf_chain0_head_change_cb_del(block, ei); |
630 | err_chain0_head_change_cb_add: | |
f36fe1c4 JP |
631 | tcf_block_owner_del(block, q, ei->binder_type); |
632 | err_block_owner_add: | |
48617387 JP |
633 | if (created) { |
634 | if (tcf_block_shared(block)) | |
635 | tcf_block_remove(block, net); | |
636 | err_block_insert: | |
48617387 JP |
637 | kfree(block); |
638 | } else { | |
639 | block->refcnt--; | |
640 | } | |
2190d1d0 | 641 | return err; |
6529eaba | 642 | } |
8c4083b3 JP |
643 | EXPORT_SYMBOL(tcf_block_get_ext); |
644 | ||
c7eb7d72 JP |
645 | static void tcf_chain_head_change_dflt(struct tcf_proto *tp_head, void *priv) |
646 | { | |
647 | struct tcf_proto __rcu **p_filter_chain = priv; | |
648 | ||
649 | rcu_assign_pointer(*p_filter_chain, tp_head); | |
650 | } | |
651 | ||
8c4083b3 | 652 | int tcf_block_get(struct tcf_block **p_block, |
8d1a77f9 AA |
653 | struct tcf_proto __rcu **p_filter_chain, struct Qdisc *q, |
654 | struct netlink_ext_ack *extack) | |
8c4083b3 | 655 | { |
c7eb7d72 JP |
656 | struct tcf_block_ext_info ei = { |
657 | .chain_head_change = tcf_chain_head_change_dflt, | |
658 | .chain_head_change_priv = p_filter_chain, | |
659 | }; | |
8c4083b3 | 660 | |
c7eb7d72 | 661 | WARN_ON(!p_filter_chain); |
8d1a77f9 | 662 | return tcf_block_get_ext(p_block, q, &ei, extack); |
8c4083b3 | 663 | } |
6529eaba JP |
664 | EXPORT_SYMBOL(tcf_block_get); |
665 | ||
7aa0045d | 666 | /* XXX: Standalone actions are not allowed to jump to any chain, and bound |
a60b3f51 | 667 | * actions should be all removed after flushing. |
7aa0045d | 668 | */ |
c7eb7d72 | 669 | void tcf_block_put_ext(struct tcf_block *block, struct Qdisc *q, |
e1ea2f98 | 670 | struct tcf_block_ext_info *ei) |
7aa0045d | 671 | { |
efbf7897 | 672 | struct tcf_chain *chain, *tmp; |
1697c4bb | 673 | |
c30abd5e DM |
674 | if (!block) |
675 | return; | |
f71e0ca4 | 676 | tcf_chain0_head_change_cb_del(block, ei); |
f36fe1c4 | 677 | tcf_block_owner_del(block, q, ei->binder_type); |
a60b3f51 | 678 | |
f71e0ca4 | 679 | if (block->refcnt == 1) { |
48617387 JP |
680 | if (tcf_block_shared(block)) |
681 | tcf_block_remove(block, block->net); | |
682 | ||
683 | /* Hold a refcnt for all chains, so that they don't disappear | |
684 | * while we are iterating. | |
685 | */ | |
686 | list_for_each_entry(chain, &block->chain_list, list) | |
687 | tcf_chain_hold(chain); | |
688 | ||
689 | list_for_each_entry(chain, &block->chain_list, list) | |
690 | tcf_chain_flush(chain); | |
691 | } | |
e2ef7544 | 692 | |
4bb1b116 JP |
693 | tcf_block_offload_unbind(block, q, ei); |
694 | ||
f71e0ca4 | 695 | if (block->refcnt == 1) { |
48617387 JP |
696 | /* At this point, all the chains should have refcnt >= 1. */ |
697 | list_for_each_entry_safe(chain, tmp, &block->chain_list, list) | |
698 | tcf_chain_put(chain); | |
df45bf84 | 699 | |
f71e0ca4 JP |
700 | block->refcnt--; |
701 | if (list_empty(&block->chain_list)) | |
702 | kfree(block); | |
48617387 | 703 | } |
6529eaba | 704 | } |
8c4083b3 JP |
705 | EXPORT_SYMBOL(tcf_block_put_ext); |
706 | ||
707 | void tcf_block_put(struct tcf_block *block) | |
708 | { | |
709 | struct tcf_block_ext_info ei = {0, }; | |
710 | ||
4853f128 JP |
711 | if (!block) |
712 | return; | |
c7eb7d72 | 713 | tcf_block_put_ext(block, block->q, &ei); |
8c4083b3 | 714 | } |
e1ea2f98 | 715 | |
6529eaba | 716 | EXPORT_SYMBOL(tcf_block_put); |
cf1facda | 717 | |
acb67442 JP |
718 | struct tcf_block_cb { |
719 | struct list_head list; | |
720 | tc_setup_cb_t *cb; | |
721 | void *cb_ident; | |
722 | void *cb_priv; | |
723 | unsigned int refcnt; | |
724 | }; | |
725 | ||
726 | void *tcf_block_cb_priv(struct tcf_block_cb *block_cb) | |
727 | { | |
728 | return block_cb->cb_priv; | |
729 | } | |
730 | EXPORT_SYMBOL(tcf_block_cb_priv); | |
731 | ||
732 | struct tcf_block_cb *tcf_block_cb_lookup(struct tcf_block *block, | |
733 | tc_setup_cb_t *cb, void *cb_ident) | |
734 | { struct tcf_block_cb *block_cb; | |
735 | ||
736 | list_for_each_entry(block_cb, &block->cb_list, list) | |
737 | if (block_cb->cb == cb && block_cb->cb_ident == cb_ident) | |
738 | return block_cb; | |
739 | return NULL; | |
740 | } | |
741 | EXPORT_SYMBOL(tcf_block_cb_lookup); | |
742 | ||
743 | void tcf_block_cb_incref(struct tcf_block_cb *block_cb) | |
744 | { | |
745 | block_cb->refcnt++; | |
746 | } | |
747 | EXPORT_SYMBOL(tcf_block_cb_incref); | |
748 | ||
749 | unsigned int tcf_block_cb_decref(struct tcf_block_cb *block_cb) | |
750 | { | |
751 | return --block_cb->refcnt; | |
752 | } | |
753 | EXPORT_SYMBOL(tcf_block_cb_decref); | |
754 | ||
32636742 JH |
755 | static int |
756 | tcf_block_playback_offloads(struct tcf_block *block, tc_setup_cb_t *cb, | |
757 | void *cb_priv, bool add, bool offload_in_use, | |
758 | struct netlink_ext_ack *extack) | |
759 | { | |
760 | struct tcf_chain *chain; | |
761 | struct tcf_proto *tp; | |
762 | int err; | |
763 | ||
764 | list_for_each_entry(chain, &block->chain_list, list) { | |
765 | for (tp = rtnl_dereference(chain->filter_chain); tp; | |
766 | tp = rtnl_dereference(tp->next)) { | |
767 | if (tp->ops->reoffload) { | |
768 | err = tp->ops->reoffload(tp, add, cb, cb_priv, | |
769 | extack); | |
770 | if (err && add) | |
771 | goto err_playback_remove; | |
772 | } else if (add && offload_in_use) { | |
773 | err = -EOPNOTSUPP; | |
774 | NL_SET_ERR_MSG(extack, "Filter HW offload failed - classifier without re-offloading support"); | |
775 | goto err_playback_remove; | |
776 | } | |
777 | } | |
778 | } | |
779 | ||
780 | return 0; | |
781 | ||
782 | err_playback_remove: | |
783 | tcf_block_playback_offloads(block, cb, cb_priv, false, offload_in_use, | |
784 | extack); | |
785 | return err; | |
786 | } | |
787 | ||
acb67442 JP |
788 | struct tcf_block_cb *__tcf_block_cb_register(struct tcf_block *block, |
789 | tc_setup_cb_t *cb, void *cb_ident, | |
60513bd8 JH |
790 | void *cb_priv, |
791 | struct netlink_ext_ack *extack) | |
acb67442 JP |
792 | { |
793 | struct tcf_block_cb *block_cb; | |
32636742 | 794 | int err; |
acb67442 | 795 | |
32636742 JH |
796 | /* Replay any already present rules */ |
797 | err = tcf_block_playback_offloads(block, cb, cb_priv, true, | |
798 | tcf_block_offload_in_use(block), | |
799 | extack); | |
800 | if (err) | |
801 | return ERR_PTR(err); | |
caa72601 | 802 | |
acb67442 JP |
803 | block_cb = kzalloc(sizeof(*block_cb), GFP_KERNEL); |
804 | if (!block_cb) | |
caa72601 | 805 | return ERR_PTR(-ENOMEM); |
acb67442 JP |
806 | block_cb->cb = cb; |
807 | block_cb->cb_ident = cb_ident; | |
808 | block_cb->cb_priv = cb_priv; | |
809 | list_add(&block_cb->list, &block->cb_list); | |
810 | return block_cb; | |
811 | } | |
812 | EXPORT_SYMBOL(__tcf_block_cb_register); | |
813 | ||
814 | int tcf_block_cb_register(struct tcf_block *block, | |
815 | tc_setup_cb_t *cb, void *cb_ident, | |
60513bd8 | 816 | void *cb_priv, struct netlink_ext_ack *extack) |
acb67442 JP |
817 | { |
818 | struct tcf_block_cb *block_cb; | |
819 | ||
60513bd8 JH |
820 | block_cb = __tcf_block_cb_register(block, cb, cb_ident, cb_priv, |
821 | extack); | |
baa2d2b1 | 822 | return PTR_ERR_OR_ZERO(block_cb); |
acb67442 JP |
823 | } |
824 | EXPORT_SYMBOL(tcf_block_cb_register); | |
825 | ||
32636742 JH |
826 | void __tcf_block_cb_unregister(struct tcf_block *block, |
827 | struct tcf_block_cb *block_cb) | |
acb67442 | 828 | { |
32636742 JH |
829 | tcf_block_playback_offloads(block, block_cb->cb, block_cb->cb_priv, |
830 | false, tcf_block_offload_in_use(block), | |
831 | NULL); | |
acb67442 JP |
832 | list_del(&block_cb->list); |
833 | kfree(block_cb); | |
834 | } | |
835 | EXPORT_SYMBOL(__tcf_block_cb_unregister); | |
836 | ||
837 | void tcf_block_cb_unregister(struct tcf_block *block, | |
838 | tc_setup_cb_t *cb, void *cb_ident) | |
839 | { | |
840 | struct tcf_block_cb *block_cb; | |
841 | ||
842 | block_cb = tcf_block_cb_lookup(block, cb, cb_ident); | |
843 | if (!block_cb) | |
844 | return; | |
32636742 | 845 | __tcf_block_cb_unregister(block, block_cb); |
acb67442 JP |
846 | } |
847 | EXPORT_SYMBOL(tcf_block_cb_unregister); | |
848 | ||
849 | static int tcf_block_cb_call(struct tcf_block *block, enum tc_setup_type type, | |
850 | void *type_data, bool err_stop) | |
851 | { | |
852 | struct tcf_block_cb *block_cb; | |
853 | int ok_count = 0; | |
854 | int err; | |
855 | ||
9a99dc1c DM |
856 | /* Make sure all netdevs sharing this block are offload-capable. */ |
857 | if (block->nooffloaddevcnt && err_stop) | |
858 | return -EOPNOTSUPP; | |
859 | ||
acb67442 JP |
860 | list_for_each_entry(block_cb, &block->cb_list, list) { |
861 | err = block_cb->cb(type, type_data, block_cb->cb_priv); | |
862 | if (err) { | |
863 | if (err_stop) | |
864 | return err; | |
865 | } else { | |
866 | ok_count++; | |
867 | } | |
868 | } | |
869 | return ok_count; | |
870 | } | |
871 | ||
87d83093 JP |
872 | /* Main classifier routine: scans classifier chain attached |
873 | * to this qdisc, (optionally) tests for protocol and asks | |
874 | * specific classifiers. | |
875 | */ | |
876 | int tcf_classify(struct sk_buff *skb, const struct tcf_proto *tp, | |
877 | struct tcf_result *res, bool compat_mode) | |
878 | { | |
879 | __be16 protocol = tc_skb_protocol(skb); | |
880 | #ifdef CONFIG_NET_CLS_ACT | |
881 | const int max_reclassify_loop = 4; | |
ee538dce JP |
882 | const struct tcf_proto *orig_tp = tp; |
883 | const struct tcf_proto *first_tp; | |
87d83093 JP |
884 | int limit = 0; |
885 | ||
886 | reclassify: | |
887 | #endif | |
888 | for (; tp; tp = rcu_dereference_bh(tp->next)) { | |
889 | int err; | |
890 | ||
891 | if (tp->protocol != protocol && | |
892 | tp->protocol != htons(ETH_P_ALL)) | |
893 | continue; | |
894 | ||
895 | err = tp->classify(skb, tp, res); | |
896 | #ifdef CONFIG_NET_CLS_ACT | |
db50514f | 897 | if (unlikely(err == TC_ACT_RECLASSIFY && !compat_mode)) { |
ee538dce | 898 | first_tp = orig_tp; |
87d83093 | 899 | goto reset; |
db50514f | 900 | } else if (unlikely(TC_ACT_EXT_CMP(err, TC_ACT_GOTO_CHAIN))) { |
ee538dce | 901 | first_tp = res->goto_tp; |
db50514f JP |
902 | goto reset; |
903 | } | |
87d83093 JP |
904 | #endif |
905 | if (err >= 0) | |
906 | return err; | |
907 | } | |
908 | ||
909 | return TC_ACT_UNSPEC; /* signal: continue lookup */ | |
910 | #ifdef CONFIG_NET_CLS_ACT | |
911 | reset: | |
912 | if (unlikely(limit++ >= max_reclassify_loop)) { | |
9d3aaff3 JP |
913 | net_notice_ratelimited("%u: reclassify loop, rule prio %u, protocol %02x\n", |
914 | tp->chain->block->index, | |
915 | tp->prio & 0xffff, | |
87d83093 JP |
916 | ntohs(tp->protocol)); |
917 | return TC_ACT_SHOT; | |
918 | } | |
919 | ||
ee538dce | 920 | tp = first_tp; |
87d83093 JP |
921 | protocol = tc_skb_protocol(skb); |
922 | goto reclassify; | |
923 | #endif | |
924 | } | |
925 | EXPORT_SYMBOL(tcf_classify); | |
926 | ||
2190d1d0 JP |
927 | struct tcf_chain_info { |
928 | struct tcf_proto __rcu **pprev; | |
929 | struct tcf_proto __rcu *next; | |
930 | }; | |
931 | ||
932 | static struct tcf_proto *tcf_chain_tp_prev(struct tcf_chain_info *chain_info) | |
933 | { | |
934 | return rtnl_dereference(*chain_info->pprev); | |
935 | } | |
936 | ||
937 | static void tcf_chain_tp_insert(struct tcf_chain *chain, | |
938 | struct tcf_chain_info *chain_info, | |
939 | struct tcf_proto *tp) | |
940 | { | |
c7eb7d72 | 941 | if (*chain_info->pprev == chain->filter_chain) |
f71e0ca4 | 942 | tcf_chain0_head_change(chain, tp); |
2190d1d0 JP |
943 | RCU_INIT_POINTER(tp->next, tcf_chain_tp_prev(chain_info)); |
944 | rcu_assign_pointer(*chain_info->pprev, tp); | |
e2ef7544 | 945 | tcf_chain_hold(chain); |
2190d1d0 JP |
946 | } |
947 | ||
948 | static void tcf_chain_tp_remove(struct tcf_chain *chain, | |
949 | struct tcf_chain_info *chain_info, | |
950 | struct tcf_proto *tp) | |
951 | { | |
952 | struct tcf_proto *next = rtnl_dereference(chain_info->next); | |
953 | ||
c7eb7d72 | 954 | if (tp == chain->filter_chain) |
f71e0ca4 | 955 | tcf_chain0_head_change(chain, next); |
2190d1d0 | 956 | RCU_INIT_POINTER(*chain_info->pprev, next); |
e2ef7544 | 957 | tcf_chain_put(chain); |
2190d1d0 JP |
958 | } |
959 | ||
960 | static struct tcf_proto *tcf_chain_tp_find(struct tcf_chain *chain, | |
961 | struct tcf_chain_info *chain_info, | |
962 | u32 protocol, u32 prio, | |
963 | bool prio_allocate) | |
964 | { | |
965 | struct tcf_proto **pprev; | |
966 | struct tcf_proto *tp; | |
967 | ||
968 | /* Check the chain for existence of proto-tcf with this priority */ | |
969 | for (pprev = &chain->filter_chain; | |
970 | (tp = rtnl_dereference(*pprev)); pprev = &tp->next) { | |
971 | if (tp->prio >= prio) { | |
972 | if (tp->prio == prio) { | |
973 | if (prio_allocate || | |
974 | (tp->protocol != protocol && protocol)) | |
975 | return ERR_PTR(-EINVAL); | |
976 | } else { | |
977 | tp = NULL; | |
978 | } | |
979 | break; | |
980 | } | |
981 | } | |
982 | chain_info->pprev = pprev; | |
983 | chain_info->next = tp ? tp->next : NULL; | |
984 | return tp; | |
985 | } | |
986 | ||
7120371c | 987 | static int tcf_fill_node(struct net *net, struct sk_buff *skb, |
7960d1da JP |
988 | struct tcf_proto *tp, struct tcf_block *block, |
989 | struct Qdisc *q, u32 parent, void *fh, | |
990 | u32 portid, u32 seq, u16 flags, int event) | |
7120371c WC |
991 | { |
992 | struct tcmsg *tcm; | |
993 | struct nlmsghdr *nlh; | |
994 | unsigned char *b = skb_tail_pointer(skb); | |
995 | ||
996 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags); | |
997 | if (!nlh) | |
998 | goto out_nlmsg_trim; | |
999 | tcm = nlmsg_data(nlh); | |
1000 | tcm->tcm_family = AF_UNSPEC; | |
1001 | tcm->tcm__pad1 = 0; | |
1002 | tcm->tcm__pad2 = 0; | |
7960d1da JP |
1003 | if (q) { |
1004 | tcm->tcm_ifindex = qdisc_dev(q)->ifindex; | |
1005 | tcm->tcm_parent = parent; | |
1006 | } else { | |
1007 | tcm->tcm_ifindex = TCM_IFINDEX_MAGIC_BLOCK; | |
1008 | tcm->tcm_block_index = block->index; | |
1009 | } | |
7120371c WC |
1010 | tcm->tcm_info = TC_H_MAKE(tp->prio, tp->protocol); |
1011 | if (nla_put_string(skb, TCA_KIND, tp->ops->kind)) | |
1012 | goto nla_put_failure; | |
1013 | if (nla_put_u32(skb, TCA_CHAIN, tp->chain->index)) | |
1014 | goto nla_put_failure; | |
1015 | if (!fh) { | |
1016 | tcm->tcm_handle = 0; | |
1017 | } else { | |
1018 | if (tp->ops->dump && tp->ops->dump(net, tp, fh, skb, tcm) < 0) | |
1019 | goto nla_put_failure; | |
1020 | } | |
1021 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; | |
1022 | return skb->len; | |
1023 | ||
1024 | out_nlmsg_trim: | |
1025 | nla_put_failure: | |
1026 | nlmsg_trim(skb, b); | |
1027 | return -1; | |
1028 | } | |
1029 | ||
1030 | static int tfilter_notify(struct net *net, struct sk_buff *oskb, | |
1031 | struct nlmsghdr *n, struct tcf_proto *tp, | |
7960d1da JP |
1032 | struct tcf_block *block, struct Qdisc *q, |
1033 | u32 parent, void *fh, int event, bool unicast) | |
7120371c WC |
1034 | { |
1035 | struct sk_buff *skb; | |
1036 | u32 portid = oskb ? NETLINK_CB(oskb).portid : 0; | |
1037 | ||
1038 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
1039 | if (!skb) | |
1040 | return -ENOBUFS; | |
1041 | ||
7960d1da JP |
1042 | if (tcf_fill_node(net, skb, tp, block, q, parent, fh, portid, |
1043 | n->nlmsg_seq, n->nlmsg_flags, event) <= 0) { | |
7120371c WC |
1044 | kfree_skb(skb); |
1045 | return -EINVAL; | |
1046 | } | |
1047 | ||
1048 | if (unicast) | |
1049 | return netlink_unicast(net->rtnl, skb, portid, MSG_DONTWAIT); | |
1050 | ||
1051 | return rtnetlink_send(skb, net, portid, RTNLGRP_TC, | |
1052 | n->nlmsg_flags & NLM_F_ECHO); | |
1053 | } | |
1054 | ||
1055 | static int tfilter_del_notify(struct net *net, struct sk_buff *oskb, | |
1056 | struct nlmsghdr *n, struct tcf_proto *tp, | |
7960d1da | 1057 | struct tcf_block *block, struct Qdisc *q, |
c35a4acc AA |
1058 | u32 parent, void *fh, bool unicast, bool *last, |
1059 | struct netlink_ext_ack *extack) | |
7120371c WC |
1060 | { |
1061 | struct sk_buff *skb; | |
1062 | u32 portid = oskb ? NETLINK_CB(oskb).portid : 0; | |
1063 | int err; | |
1064 | ||
1065 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
1066 | if (!skb) | |
1067 | return -ENOBUFS; | |
1068 | ||
7960d1da JP |
1069 | if (tcf_fill_node(net, skb, tp, block, q, parent, fh, portid, |
1070 | n->nlmsg_seq, n->nlmsg_flags, RTM_DELTFILTER) <= 0) { | |
c35a4acc | 1071 | NL_SET_ERR_MSG(extack, "Failed to build del event notification"); |
7120371c WC |
1072 | kfree_skb(skb); |
1073 | return -EINVAL; | |
1074 | } | |
1075 | ||
571acf21 | 1076 | err = tp->ops->delete(tp, fh, last, extack); |
7120371c WC |
1077 | if (err) { |
1078 | kfree_skb(skb); | |
1079 | return err; | |
1080 | } | |
1081 | ||
1082 | if (unicast) | |
1083 | return netlink_unicast(net->rtnl, skb, portid, MSG_DONTWAIT); | |
1084 | ||
c35a4acc AA |
1085 | err = rtnetlink_send(skb, net, portid, RTNLGRP_TC, |
1086 | n->nlmsg_flags & NLM_F_ECHO); | |
1087 | if (err < 0) | |
1088 | NL_SET_ERR_MSG(extack, "Failed to send filter delete notification"); | |
1089 | return err; | |
7120371c WC |
1090 | } |
1091 | ||
1092 | static void tfilter_notify_chain(struct net *net, struct sk_buff *oskb, | |
7960d1da JP |
1093 | struct tcf_block *block, struct Qdisc *q, |
1094 | u32 parent, struct nlmsghdr *n, | |
7120371c WC |
1095 | struct tcf_chain *chain, int event) |
1096 | { | |
1097 | struct tcf_proto *tp; | |
1098 | ||
1099 | for (tp = rtnl_dereference(chain->filter_chain); | |
1100 | tp; tp = rtnl_dereference(tp->next)) | |
7960d1da | 1101 | tfilter_notify(net, oskb, n, tp, block, |
53189183 | 1102 | q, parent, NULL, event, false); |
7120371c WC |
1103 | } |
1104 | ||
c431f89b | 1105 | static int tc_new_tfilter(struct sk_buff *skb, struct nlmsghdr *n, |
c21ef3e3 | 1106 | struct netlink_ext_ack *extack) |
1da177e4 | 1107 | { |
3b1e0a65 | 1108 | struct net *net = sock_net(skb->sk); |
add93b61 | 1109 | struct nlattr *tca[TCA_MAX + 1]; |
1da177e4 LT |
1110 | struct tcmsg *t; |
1111 | u32 protocol; | |
1112 | u32 prio; | |
9d36d9e5 | 1113 | bool prio_allocate; |
1da177e4 | 1114 | u32 parent; |
5bc17018 | 1115 | u32 chain_index; |
7960d1da | 1116 | struct Qdisc *q = NULL; |
2190d1d0 | 1117 | struct tcf_chain_info chain_info; |
5bc17018 | 1118 | struct tcf_chain *chain = NULL; |
6529eaba | 1119 | struct tcf_block *block; |
1da177e4 | 1120 | struct tcf_proto *tp; |
1da177e4 | 1121 | unsigned long cl; |
8113c095 | 1122 | void *fh; |
1da177e4 | 1123 | int err; |
628185cf | 1124 | int tp_created; |
1da177e4 | 1125 | |
c431f89b | 1126 | if (!netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)) |
dfc47ef8 | 1127 | return -EPERM; |
de179c8c | 1128 | |
1da177e4 | 1129 | replay: |
628185cf DB |
1130 | tp_created = 0; |
1131 | ||
c21ef3e3 | 1132 | err = nlmsg_parse(n, sizeof(*t), tca, TCA_MAX, NULL, extack); |
de179c8c H |
1133 | if (err < 0) |
1134 | return err; | |
1135 | ||
942b8165 | 1136 | t = nlmsg_data(n); |
1da177e4 LT |
1137 | protocol = TC_H_MIN(t->tcm_info); |
1138 | prio = TC_H_MAJ(t->tcm_info); | |
9d36d9e5 | 1139 | prio_allocate = false; |
1da177e4 LT |
1140 | parent = t->tcm_parent; |
1141 | cl = 0; | |
1142 | ||
1143 | if (prio == 0) { | |
c431f89b VB |
1144 | /* If no priority is provided by the user, |
1145 | * we allocate one. | |
1146 | */ | |
1147 | if (n->nlmsg_flags & NLM_F_CREATE) { | |
1148 | prio = TC_H_MAKE(0x80000000U, 0U); | |
1149 | prio_allocate = true; | |
1150 | } else { | |
c35a4acc | 1151 | NL_SET_ERR_MSG(extack, "Invalid filter command with priority of zero"); |
1da177e4 | 1152 | return -ENOENT; |
ea7f8277 | 1153 | } |
1da177e4 LT |
1154 | } |
1155 | ||
1156 | /* Find head of filter chain. */ | |
1157 | ||
c431f89b VB |
1158 | block = tcf_block_find(net, &q, &parent, &cl, |
1159 | t->tcm_ifindex, t->tcm_block_index, extack); | |
1160 | if (IS_ERR(block)) { | |
1161 | err = PTR_ERR(block); | |
1162 | goto errout; | |
6bb16e7a | 1163 | } |
5bc17018 JP |
1164 | |
1165 | chain_index = tca[TCA_CHAIN] ? nla_get_u32(tca[TCA_CHAIN]) : 0; | |
1166 | if (chain_index > TC_ACT_EXT_VAL_MASK) { | |
c35a4acc | 1167 | NL_SET_ERR_MSG(extack, "Specified chain index exceeds upper limit"); |
5bc17018 JP |
1168 | err = -EINVAL; |
1169 | goto errout; | |
1170 | } | |
c431f89b | 1171 | chain = tcf_chain_get(block, chain_index, true); |
5bc17018 | 1172 | if (!chain) { |
c35a4acc | 1173 | NL_SET_ERR_MSG(extack, "Cannot find specified filter chain"); |
c431f89b | 1174 | err = -ENOMEM; |
ea7f8277 DB |
1175 | goto errout; |
1176 | } | |
1da177e4 | 1177 | |
2190d1d0 JP |
1178 | tp = tcf_chain_tp_find(chain, &chain_info, protocol, |
1179 | prio, prio_allocate); | |
1180 | if (IS_ERR(tp)) { | |
c35a4acc | 1181 | NL_SET_ERR_MSG(extack, "Filter with specified priority/protocol not found"); |
2190d1d0 JP |
1182 | err = PTR_ERR(tp); |
1183 | goto errout; | |
1da177e4 LT |
1184 | } |
1185 | ||
1186 | if (tp == NULL) { | |
1187 | /* Proto-tcf does not exist, create new one */ | |
1188 | ||
6bb16e7a | 1189 | if (tca[TCA_KIND] == NULL || !protocol) { |
c35a4acc | 1190 | NL_SET_ERR_MSG(extack, "Filter kind and protocol must be specified"); |
6bb16e7a | 1191 | err = -EINVAL; |
1da177e4 | 1192 | goto errout; |
6bb16e7a | 1193 | } |
1da177e4 | 1194 | |
c431f89b | 1195 | if (!(n->nlmsg_flags & NLM_F_CREATE)) { |
c35a4acc | 1196 | NL_SET_ERR_MSG(extack, "Need both RTM_NEWTFILTER and NLM_F_CREATE to create a new filter"); |
6bb16e7a | 1197 | err = -ENOENT; |
1da177e4 | 1198 | goto errout; |
6bb16e7a | 1199 | } |
1da177e4 | 1200 | |
9d36d9e5 | 1201 | if (prio_allocate) |
2190d1d0 | 1202 | prio = tcf_auto_prio(tcf_chain_tp_prev(&chain_info)); |
1da177e4 | 1203 | |
33a48927 | 1204 | tp = tcf_proto_create(nla_data(tca[TCA_KIND]), |
c35a4acc | 1205 | protocol, prio, chain, extack); |
33a48927 JP |
1206 | if (IS_ERR(tp)) { |
1207 | err = PTR_ERR(tp); | |
1da177e4 LT |
1208 | goto errout; |
1209 | } | |
12186be7 | 1210 | tp_created = 1; |
6bb16e7a | 1211 | } else if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], tp->ops->kind)) { |
c35a4acc | 1212 | NL_SET_ERR_MSG(extack, "Specified filter kind does not match existing one"); |
6bb16e7a | 1213 | err = -EINVAL; |
1da177e4 | 1214 | goto errout; |
6bb16e7a | 1215 | } |
1da177e4 LT |
1216 | |
1217 | fh = tp->ops->get(tp, t->tcm_handle); | |
1218 | ||
8113c095 | 1219 | if (!fh) { |
c431f89b | 1220 | if (!(n->nlmsg_flags & NLM_F_CREATE)) { |
c35a4acc | 1221 | NL_SET_ERR_MSG(extack, "Need both RTM_NEWTFILTER and NLM_F_CREATE to create a new filter"); |
6bb16e7a | 1222 | err = -ENOENT; |
1da177e4 | 1223 | goto errout; |
6bb16e7a | 1224 | } |
c431f89b VB |
1225 | } else if (n->nlmsg_flags & NLM_F_EXCL) { |
1226 | NL_SET_ERR_MSG(extack, "Filter already exists"); | |
1227 | err = -EEXIST; | |
1228 | goto errout; | |
1da177e4 LT |
1229 | } |
1230 | ||
2f7ef2f8 | 1231 | err = tp->ops->change(net, skb, tp, cl, t->tcm_handle, tca, &fh, |
7306db38 AA |
1232 | n->nlmsg_flags & NLM_F_CREATE ? TCA_ACT_NOREPLACE : TCA_ACT_REPLACE, |
1233 | extack); | |
12186be7 | 1234 | if (err == 0) { |
2190d1d0 JP |
1235 | if (tp_created) |
1236 | tcf_chain_tp_insert(chain, &chain_info, tp); | |
7960d1da | 1237 | tfilter_notify(net, skb, n, tp, block, q, parent, fh, |
a10fa201 | 1238 | RTM_NEWTFILTER, false); |
12186be7 MU |
1239 | } else { |
1240 | if (tp_created) | |
715df5ec | 1241 | tcf_proto_destroy(tp, NULL); |
12186be7 | 1242 | } |
1da177e4 LT |
1243 | |
1244 | errout: | |
5bc17018 JP |
1245 | if (chain) |
1246 | tcf_chain_put(chain); | |
1da177e4 LT |
1247 | if (err == -EAGAIN) |
1248 | /* Replay the request. */ | |
1249 | goto replay; | |
1250 | return err; | |
1251 | } | |
1252 | ||
c431f89b VB |
1253 | static int tc_del_tfilter(struct sk_buff *skb, struct nlmsghdr *n, |
1254 | struct netlink_ext_ack *extack) | |
1255 | { | |
1256 | struct net *net = sock_net(skb->sk); | |
1257 | struct nlattr *tca[TCA_MAX + 1]; | |
1258 | struct tcmsg *t; | |
1259 | u32 protocol; | |
1260 | u32 prio; | |
1261 | u32 parent; | |
1262 | u32 chain_index; | |
1263 | struct Qdisc *q = NULL; | |
1264 | struct tcf_chain_info chain_info; | |
1265 | struct tcf_chain *chain = NULL; | |
1266 | struct tcf_block *block; | |
1267 | struct tcf_proto *tp = NULL; | |
1268 | unsigned long cl = 0; | |
1269 | void *fh = NULL; | |
1270 | int err; | |
1271 | ||
1272 | if (!netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)) | |
1273 | return -EPERM; | |
1274 | ||
1275 | err = nlmsg_parse(n, sizeof(*t), tca, TCA_MAX, NULL, extack); | |
1276 | if (err < 0) | |
1277 | return err; | |
1278 | ||
1279 | t = nlmsg_data(n); | |
1280 | protocol = TC_H_MIN(t->tcm_info); | |
1281 | prio = TC_H_MAJ(t->tcm_info); | |
1282 | parent = t->tcm_parent; | |
1283 | ||
1284 | if (prio == 0 && (protocol || t->tcm_handle || tca[TCA_KIND])) { | |
1285 | NL_SET_ERR_MSG(extack, "Cannot flush filters with protocol, handle or kind set"); | |
1286 | return -ENOENT; | |
1287 | } | |
1288 | ||
1289 | /* Find head of filter chain. */ | |
1290 | ||
1291 | block = tcf_block_find(net, &q, &parent, &cl, | |
1292 | t->tcm_ifindex, t->tcm_block_index, extack); | |
1293 | if (IS_ERR(block)) { | |
1294 | err = PTR_ERR(block); | |
1295 | goto errout; | |
1296 | } | |
1297 | ||
1298 | chain_index = tca[TCA_CHAIN] ? nla_get_u32(tca[TCA_CHAIN]) : 0; | |
1299 | if (chain_index > TC_ACT_EXT_VAL_MASK) { | |
1300 | NL_SET_ERR_MSG(extack, "Specified chain index exceeds upper limit"); | |
1301 | err = -EINVAL; | |
1302 | goto errout; | |
1303 | } | |
1304 | chain = tcf_chain_get(block, chain_index, false); | |
1305 | if (!chain) { | |
1306 | NL_SET_ERR_MSG(extack, "Cannot find specified filter chain"); | |
1307 | err = -EINVAL; | |
1308 | goto errout; | |
1309 | } | |
1310 | ||
1311 | if (prio == 0) { | |
1312 | tfilter_notify_chain(net, skb, block, q, parent, n, | |
1313 | chain, RTM_DELTFILTER); | |
1314 | tcf_chain_flush(chain); | |
1315 | err = 0; | |
1316 | goto errout; | |
1317 | } | |
1318 | ||
1319 | tp = tcf_chain_tp_find(chain, &chain_info, protocol, | |
1320 | prio, false); | |
1321 | if (!tp || IS_ERR(tp)) { | |
1322 | NL_SET_ERR_MSG(extack, "Filter with specified priority/protocol not found"); | |
0e399035 | 1323 | err = tp ? PTR_ERR(tp) : -ENOENT; |
c431f89b VB |
1324 | goto errout; |
1325 | } else if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], tp->ops->kind)) { | |
1326 | NL_SET_ERR_MSG(extack, "Specified filter kind does not match existing one"); | |
1327 | err = -EINVAL; | |
1328 | goto errout; | |
1329 | } | |
1330 | ||
1331 | fh = tp->ops->get(tp, t->tcm_handle); | |
1332 | ||
1333 | if (!fh) { | |
1334 | if (t->tcm_handle == 0) { | |
1335 | tcf_chain_tp_remove(chain, &chain_info, tp); | |
1336 | tfilter_notify(net, skb, n, tp, block, q, parent, fh, | |
1337 | RTM_DELTFILTER, false); | |
1338 | tcf_proto_destroy(tp, extack); | |
1339 | err = 0; | |
1340 | } else { | |
1341 | NL_SET_ERR_MSG(extack, "Specified filter handle not found"); | |
1342 | err = -ENOENT; | |
1343 | } | |
1344 | } else { | |
1345 | bool last; | |
1346 | ||
1347 | err = tfilter_del_notify(net, skb, n, tp, block, | |
1348 | q, parent, fh, false, &last, | |
1349 | extack); | |
1350 | if (err) | |
1351 | goto errout; | |
1352 | if (last) { | |
1353 | tcf_chain_tp_remove(chain, &chain_info, tp); | |
1354 | tcf_proto_destroy(tp, extack); | |
1355 | } | |
1356 | } | |
1357 | ||
1358 | errout: | |
1359 | if (chain) | |
1360 | tcf_chain_put(chain); | |
1361 | return err; | |
1362 | } | |
1363 | ||
1364 | static int tc_get_tfilter(struct sk_buff *skb, struct nlmsghdr *n, | |
1365 | struct netlink_ext_ack *extack) | |
1366 | { | |
1367 | struct net *net = sock_net(skb->sk); | |
1368 | struct nlattr *tca[TCA_MAX + 1]; | |
1369 | struct tcmsg *t; | |
1370 | u32 protocol; | |
1371 | u32 prio; | |
1372 | u32 parent; | |
1373 | u32 chain_index; | |
1374 | struct Qdisc *q = NULL; | |
1375 | struct tcf_chain_info chain_info; | |
1376 | struct tcf_chain *chain = NULL; | |
1377 | struct tcf_block *block; | |
1378 | struct tcf_proto *tp = NULL; | |
1379 | unsigned long cl = 0; | |
1380 | void *fh = NULL; | |
1381 | int err; | |
1382 | ||
1383 | err = nlmsg_parse(n, sizeof(*t), tca, TCA_MAX, NULL, extack); | |
1384 | if (err < 0) | |
1385 | return err; | |
1386 | ||
1387 | t = nlmsg_data(n); | |
1388 | protocol = TC_H_MIN(t->tcm_info); | |
1389 | prio = TC_H_MAJ(t->tcm_info); | |
1390 | parent = t->tcm_parent; | |
1391 | ||
1392 | if (prio == 0) { | |
1393 | NL_SET_ERR_MSG(extack, "Invalid filter command with priority of zero"); | |
1394 | return -ENOENT; | |
1395 | } | |
1396 | ||
1397 | /* Find head of filter chain. */ | |
1398 | ||
1399 | block = tcf_block_find(net, &q, &parent, &cl, | |
1400 | t->tcm_ifindex, t->tcm_block_index, extack); | |
1401 | if (IS_ERR(block)) { | |
1402 | err = PTR_ERR(block); | |
1403 | goto errout; | |
1404 | } | |
1405 | ||
1406 | chain_index = tca[TCA_CHAIN] ? nla_get_u32(tca[TCA_CHAIN]) : 0; | |
1407 | if (chain_index > TC_ACT_EXT_VAL_MASK) { | |
1408 | NL_SET_ERR_MSG(extack, "Specified chain index exceeds upper limit"); | |
1409 | err = -EINVAL; | |
1410 | goto errout; | |
1411 | } | |
1412 | chain = tcf_chain_get(block, chain_index, false); | |
1413 | if (!chain) { | |
1414 | NL_SET_ERR_MSG(extack, "Cannot find specified filter chain"); | |
1415 | err = -EINVAL; | |
1416 | goto errout; | |
1417 | } | |
1418 | ||
1419 | tp = tcf_chain_tp_find(chain, &chain_info, protocol, | |
1420 | prio, false); | |
1421 | if (!tp || IS_ERR(tp)) { | |
1422 | NL_SET_ERR_MSG(extack, "Filter with specified priority/protocol not found"); | |
0e399035 | 1423 | err = tp ? PTR_ERR(tp) : -ENOENT; |
c431f89b VB |
1424 | goto errout; |
1425 | } else if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], tp->ops->kind)) { | |
1426 | NL_SET_ERR_MSG(extack, "Specified filter kind does not match existing one"); | |
1427 | err = -EINVAL; | |
1428 | goto errout; | |
1429 | } | |
1430 | ||
1431 | fh = tp->ops->get(tp, t->tcm_handle); | |
1432 | ||
1433 | if (!fh) { | |
1434 | NL_SET_ERR_MSG(extack, "Specified filter handle not found"); | |
1435 | err = -ENOENT; | |
1436 | } else { | |
1437 | err = tfilter_notify(net, skb, n, tp, block, q, parent, | |
1438 | fh, RTM_NEWTFILTER, true); | |
1439 | if (err < 0) | |
1440 | NL_SET_ERR_MSG(extack, "Failed to send filter notify message"); | |
1441 | } | |
1442 | ||
1443 | errout: | |
1444 | if (chain) | |
1445 | tcf_chain_put(chain); | |
1446 | return err; | |
1447 | } | |
1448 | ||
aa767bfe | 1449 | struct tcf_dump_args { |
1da177e4 LT |
1450 | struct tcf_walker w; |
1451 | struct sk_buff *skb; | |
1452 | struct netlink_callback *cb; | |
7960d1da | 1453 | struct tcf_block *block; |
a10fa201 JP |
1454 | struct Qdisc *q; |
1455 | u32 parent; | |
1da177e4 LT |
1456 | }; |
1457 | ||
8113c095 | 1458 | static int tcf_node_dump(struct tcf_proto *tp, void *n, struct tcf_walker *arg) |
1da177e4 | 1459 | { |
aa767bfe | 1460 | struct tcf_dump_args *a = (void *)arg; |
832d1d5b | 1461 | struct net *net = sock_net(a->skb->sk); |
1da177e4 | 1462 | |
7960d1da | 1463 | return tcf_fill_node(net, a->skb, tp, a->block, a->q, a->parent, |
a10fa201 | 1464 | n, NETLINK_CB(a->cb->skb).portid, |
5a7a5555 JHS |
1465 | a->cb->nlh->nlmsg_seq, NLM_F_MULTI, |
1466 | RTM_NEWTFILTER); | |
1da177e4 LT |
1467 | } |
1468 | ||
a10fa201 JP |
1469 | static bool tcf_chain_dump(struct tcf_chain *chain, struct Qdisc *q, u32 parent, |
1470 | struct sk_buff *skb, struct netlink_callback *cb, | |
acb31fae JP |
1471 | long index_start, long *p_index) |
1472 | { | |
1473 | struct net *net = sock_net(skb->sk); | |
7960d1da | 1474 | struct tcf_block *block = chain->block; |
acb31fae JP |
1475 | struct tcmsg *tcm = nlmsg_data(cb->nlh); |
1476 | struct tcf_dump_args arg; | |
1477 | struct tcf_proto *tp; | |
1478 | ||
1479 | for (tp = rtnl_dereference(chain->filter_chain); | |
1480 | tp; tp = rtnl_dereference(tp->next), (*p_index)++) { | |
1481 | if (*p_index < index_start) | |
1482 | continue; | |
1483 | if (TC_H_MAJ(tcm->tcm_info) && | |
1484 | TC_H_MAJ(tcm->tcm_info) != tp->prio) | |
1485 | continue; | |
1486 | if (TC_H_MIN(tcm->tcm_info) && | |
1487 | TC_H_MIN(tcm->tcm_info) != tp->protocol) | |
1488 | continue; | |
1489 | if (*p_index > index_start) | |
1490 | memset(&cb->args[1], 0, | |
1491 | sizeof(cb->args) - sizeof(cb->args[0])); | |
1492 | if (cb->args[1] == 0) { | |
53189183 | 1493 | if (tcf_fill_node(net, skb, tp, block, q, parent, NULL, |
acb31fae JP |
1494 | NETLINK_CB(cb->skb).portid, |
1495 | cb->nlh->nlmsg_seq, NLM_F_MULTI, | |
1496 | RTM_NEWTFILTER) <= 0) | |
5bc17018 | 1497 | return false; |
acb31fae JP |
1498 | |
1499 | cb->args[1] = 1; | |
1500 | } | |
1501 | if (!tp->ops->walk) | |
1502 | continue; | |
1503 | arg.w.fn = tcf_node_dump; | |
1504 | arg.skb = skb; | |
1505 | arg.cb = cb; | |
7960d1da | 1506 | arg.block = block; |
a10fa201 JP |
1507 | arg.q = q; |
1508 | arg.parent = parent; | |
acb31fae JP |
1509 | arg.w.stop = 0; |
1510 | arg.w.skip = cb->args[1] - 1; | |
1511 | arg.w.count = 0; | |
01683a14 | 1512 | arg.w.cookie = cb->args[2]; |
acb31fae | 1513 | tp->ops->walk(tp, &arg.w); |
01683a14 | 1514 | cb->args[2] = arg.w.cookie; |
acb31fae JP |
1515 | cb->args[1] = arg.w.count + 1; |
1516 | if (arg.w.stop) | |
5bc17018 | 1517 | return false; |
acb31fae | 1518 | } |
5bc17018 | 1519 | return true; |
acb31fae JP |
1520 | } |
1521 | ||
bd27a875 | 1522 | /* called with RTNL */ |
1da177e4 LT |
1523 | static int tc_dump_tfilter(struct sk_buff *skb, struct netlink_callback *cb) |
1524 | { | |
3b1e0a65 | 1525 | struct net *net = sock_net(skb->sk); |
5bc17018 | 1526 | struct nlattr *tca[TCA_MAX + 1]; |
7960d1da | 1527 | struct Qdisc *q = NULL; |
6529eaba | 1528 | struct tcf_block *block; |
2190d1d0 | 1529 | struct tcf_chain *chain; |
942b8165 | 1530 | struct tcmsg *tcm = nlmsg_data(cb->nlh); |
acb31fae JP |
1531 | long index_start; |
1532 | long index; | |
a10fa201 | 1533 | u32 parent; |
5bc17018 | 1534 | int err; |
1da177e4 | 1535 | |
573ce260 | 1536 | if (nlmsg_len(cb->nlh) < sizeof(*tcm)) |
1da177e4 | 1537 | return skb->len; |
5bc17018 JP |
1538 | |
1539 | err = nlmsg_parse(cb->nlh, sizeof(*tcm), tca, TCA_MAX, NULL, NULL); | |
1540 | if (err) | |
1541 | return err; | |
1542 | ||
7960d1da JP |
1543 | if (tcm->tcm_ifindex == TCM_IFINDEX_MAGIC_BLOCK) { |
1544 | block = tcf_block_lookup(net, tcm->tcm_block_index); | |
1545 | if (!block) | |
1546 | goto out; | |
d680b352 JP |
1547 | /* If we work with block index, q is NULL and parent value |
1548 | * will never be used in the following code. The check | |
1549 | * in tcf_fill_node prevents it. However, compiler does not | |
1550 | * see that far, so set parent to zero to silence the warning | |
1551 | * about parent being uninitialized. | |
1552 | */ | |
1553 | parent = 0; | |
a10fa201 | 1554 | } else { |
7960d1da JP |
1555 | const struct Qdisc_class_ops *cops; |
1556 | struct net_device *dev; | |
1557 | unsigned long cl = 0; | |
1558 | ||
1559 | dev = __dev_get_by_index(net, tcm->tcm_ifindex); | |
1560 | if (!dev) | |
1561 | return skb->len; | |
1562 | ||
1563 | parent = tcm->tcm_parent; | |
1564 | if (!parent) { | |
1565 | q = dev->qdisc; | |
1566 | parent = q->handle; | |
1567 | } else { | |
1568 | q = qdisc_lookup(dev, TC_H_MAJ(tcm->tcm_parent)); | |
1569 | } | |
1570 | if (!q) | |
1571 | goto out; | |
1572 | cops = q->ops->cl_ops; | |
1573 | if (!cops) | |
143976ce | 1574 | goto out; |
7960d1da JP |
1575 | if (!cops->tcf_block) |
1576 | goto out; | |
1577 | if (TC_H_MIN(tcm->tcm_parent)) { | |
1578 | cl = cops->find(q, tcm->tcm_parent); | |
1579 | if (cl == 0) | |
1580 | goto out; | |
1581 | } | |
1582 | block = cops->tcf_block(q, cl, NULL); | |
1583 | if (!block) | |
1584 | goto out; | |
1585 | if (tcf_block_shared(block)) | |
1586 | q = NULL; | |
1da177e4 | 1587 | } |
1da177e4 | 1588 | |
acb31fae JP |
1589 | index_start = cb->args[0]; |
1590 | index = 0; | |
5bc17018 JP |
1591 | |
1592 | list_for_each_entry(chain, &block->chain_list, list) { | |
1593 | if (tca[TCA_CHAIN] && | |
1594 | nla_get_u32(tca[TCA_CHAIN]) != chain->index) | |
1595 | continue; | |
a10fa201 | 1596 | if (!tcf_chain_dump(chain, q, parent, skb, cb, |
5ae437ad RK |
1597 | index_start, &index)) { |
1598 | err = -EMSGSIZE; | |
5bc17018 | 1599 | break; |
5ae437ad | 1600 | } |
5bc17018 JP |
1601 | } |
1602 | ||
acb31fae | 1603 | cb->args[0] = index; |
1da177e4 | 1604 | |
1da177e4 | 1605 | out: |
5ae437ad RK |
1606 | /* If we did no progress, the error (EMSGSIZE) is real */ |
1607 | if (skb->len == 0 && err) | |
1608 | return err; | |
1da177e4 LT |
1609 | return skb->len; |
1610 | } | |
1611 | ||
18d0264f | 1612 | void tcf_exts_destroy(struct tcf_exts *exts) |
1da177e4 LT |
1613 | { |
1614 | #ifdef CONFIG_NET_CLS_ACT | |
90b73b77 | 1615 | tcf_action_destroy(exts->actions, TCA_ACT_UNBIND); |
22dc13c8 WC |
1616 | kfree(exts->actions); |
1617 | exts->nr_actions = 0; | |
1da177e4 LT |
1618 | #endif |
1619 | } | |
aa767bfe | 1620 | EXPORT_SYMBOL(tcf_exts_destroy); |
1da177e4 | 1621 | |
c1b52739 | 1622 | int tcf_exts_validate(struct net *net, struct tcf_proto *tp, struct nlattr **tb, |
50a56190 AA |
1623 | struct nlattr *rate_tlv, struct tcf_exts *exts, bool ovr, |
1624 | struct netlink_ext_ack *extack) | |
1da177e4 | 1625 | { |
1da177e4 LT |
1626 | #ifdef CONFIG_NET_CLS_ACT |
1627 | { | |
1da177e4 | 1628 | struct tc_action *act; |
d04e6990 | 1629 | size_t attr_size = 0; |
1da177e4 | 1630 | |
5da57f42 | 1631 | if (exts->police && tb[exts->police]) { |
9fb9f251 JP |
1632 | act = tcf_action_init_1(net, tp, tb[exts->police], |
1633 | rate_tlv, "police", ovr, | |
789871bb | 1634 | TCA_ACT_BIND, true, extack); |
ab27cfb8 PM |
1635 | if (IS_ERR(act)) |
1636 | return PTR_ERR(act); | |
1da177e4 | 1637 | |
33be6271 | 1638 | act->type = exts->type = TCA_OLD_COMPAT; |
22dc13c8 WC |
1639 | exts->actions[0] = act; |
1640 | exts->nr_actions = 1; | |
5da57f42 | 1641 | } else if (exts->action && tb[exts->action]) { |
90b73b77 | 1642 | int err; |
22dc13c8 | 1643 | |
9fb9f251 JP |
1644 | err = tcf_action_init(net, tp, tb[exts->action], |
1645 | rate_tlv, NULL, ovr, TCA_ACT_BIND, | |
90b73b77 | 1646 | exts->actions, &attr_size, true, |
789871bb | 1647 | extack); |
90b73b77 | 1648 | if (err < 0) |
33be6271 | 1649 | return err; |
90b73b77 | 1650 | exts->nr_actions = err; |
1da177e4 | 1651 | } |
e4b95c41 | 1652 | exts->net = net; |
1da177e4 | 1653 | } |
1da177e4 | 1654 | #else |
5da57f42 | 1655 | if ((exts->action && tb[exts->action]) || |
50a56190 AA |
1656 | (exts->police && tb[exts->police])) { |
1657 | NL_SET_ERR_MSG(extack, "Classifier actions are not supported per compile options (CONFIG_NET_CLS_ACT)"); | |
1da177e4 | 1658 | return -EOPNOTSUPP; |
50a56190 | 1659 | } |
1da177e4 LT |
1660 | #endif |
1661 | ||
1662 | return 0; | |
1663 | } | |
aa767bfe | 1664 | EXPORT_SYMBOL(tcf_exts_validate); |
1da177e4 | 1665 | |
9b0d4446 | 1666 | void tcf_exts_change(struct tcf_exts *dst, struct tcf_exts *src) |
1da177e4 LT |
1667 | { |
1668 | #ifdef CONFIG_NET_CLS_ACT | |
22dc13c8 WC |
1669 | struct tcf_exts old = *dst; |
1670 | ||
9b0d4446 | 1671 | *dst = *src; |
22dc13c8 | 1672 | tcf_exts_destroy(&old); |
1da177e4 LT |
1673 | #endif |
1674 | } | |
aa767bfe | 1675 | EXPORT_SYMBOL(tcf_exts_change); |
1da177e4 | 1676 | |
22dc13c8 WC |
1677 | #ifdef CONFIG_NET_CLS_ACT |
1678 | static struct tc_action *tcf_exts_first_act(struct tcf_exts *exts) | |
1679 | { | |
1680 | if (exts->nr_actions == 0) | |
1681 | return NULL; | |
1682 | else | |
1683 | return exts->actions[0]; | |
1684 | } | |
1685 | #endif | |
33be6271 | 1686 | |
5da57f42 | 1687 | int tcf_exts_dump(struct sk_buff *skb, struct tcf_exts *exts) |
1da177e4 LT |
1688 | { |
1689 | #ifdef CONFIG_NET_CLS_ACT | |
9cc63db5 CW |
1690 | struct nlattr *nest; |
1691 | ||
978dfd8d | 1692 | if (exts->action && tcf_exts_has_actions(exts)) { |
1da177e4 LT |
1693 | /* |
1694 | * again for backward compatible mode - we want | |
1695 | * to work with both old and new modes of entering | |
1696 | * tc data even if iproute2 was newer - jhs | |
1697 | */ | |
33be6271 | 1698 | if (exts->type != TCA_OLD_COMPAT) { |
5da57f42 | 1699 | nest = nla_nest_start(skb, exts->action); |
4b3550ef PM |
1700 | if (nest == NULL) |
1701 | goto nla_put_failure; | |
22dc13c8 | 1702 | |
90b73b77 | 1703 | if (tcf_action_dump(skb, exts->actions, 0, 0) < 0) |
add93b61 | 1704 | goto nla_put_failure; |
4b3550ef | 1705 | nla_nest_end(skb, nest); |
5da57f42 | 1706 | } else if (exts->police) { |
33be6271 | 1707 | struct tc_action *act = tcf_exts_first_act(exts); |
5da57f42 | 1708 | nest = nla_nest_start(skb, exts->police); |
63acd680 | 1709 | if (nest == NULL || !act) |
4b3550ef | 1710 | goto nla_put_failure; |
33be6271 | 1711 | if (tcf_action_dump_old(skb, act, 0, 0) < 0) |
add93b61 | 1712 | goto nla_put_failure; |
4b3550ef | 1713 | nla_nest_end(skb, nest); |
1da177e4 LT |
1714 | } |
1715 | } | |
1da177e4 | 1716 | return 0; |
9cc63db5 CW |
1717 | |
1718 | nla_put_failure: | |
1719 | nla_nest_cancel(skb, nest); | |
1da177e4 | 1720 | return -1; |
9cc63db5 CW |
1721 | #else |
1722 | return 0; | |
1723 | #endif | |
1da177e4 | 1724 | } |
aa767bfe | 1725 | EXPORT_SYMBOL(tcf_exts_dump); |
1da177e4 | 1726 | |
aa767bfe | 1727 | |
5da57f42 | 1728 | int tcf_exts_dump_stats(struct sk_buff *skb, struct tcf_exts *exts) |
1da177e4 LT |
1729 | { |
1730 | #ifdef CONFIG_NET_CLS_ACT | |
33be6271 | 1731 | struct tc_action *a = tcf_exts_first_act(exts); |
b057df24 | 1732 | if (a != NULL && tcf_action_copy_stats(skb, a, 1) < 0) |
33be6271 | 1733 | return -1; |
1da177e4 LT |
1734 | #endif |
1735 | return 0; | |
1da177e4 | 1736 | } |
aa767bfe | 1737 | EXPORT_SYMBOL(tcf_exts_dump_stats); |
1da177e4 | 1738 | |
717503b9 JP |
1739 | static int tc_exts_setup_cb_egdev_call(struct tcf_exts *exts, |
1740 | enum tc_setup_type type, | |
1741 | void *type_data, bool err_stop) | |
b3f55bdd JP |
1742 | { |
1743 | int ok_count = 0; | |
1744 | #ifdef CONFIG_NET_CLS_ACT | |
1745 | const struct tc_action *a; | |
1746 | struct net_device *dev; | |
9d452ceb | 1747 | int i, ret; |
b3f55bdd JP |
1748 | |
1749 | if (!tcf_exts_has_actions(exts)) | |
1750 | return 0; | |
1751 | ||
9d452ceb OG |
1752 | for (i = 0; i < exts->nr_actions; i++) { |
1753 | a = exts->actions[i]; | |
b3f55bdd JP |
1754 | if (!a->ops->get_dev) |
1755 | continue; | |
1756 | dev = a->ops->get_dev(a); | |
7612fb03 | 1757 | if (!dev) |
b3f55bdd JP |
1758 | continue; |
1759 | ret = tc_setup_cb_egdev_call(dev, type, type_data, err_stop); | |
1760 | if (ret < 0) | |
1761 | return ret; | |
1762 | ok_count += ret; | |
1763 | } | |
1764 | #endif | |
1765 | return ok_count; | |
1766 | } | |
717503b9 | 1767 | |
208c0f4b JP |
1768 | int tc_setup_cb_call(struct tcf_block *block, struct tcf_exts *exts, |
1769 | enum tc_setup_type type, void *type_data, bool err_stop) | |
717503b9 | 1770 | { |
9a99dc1c | 1771 | int ok_count; |
208c0f4b JP |
1772 | int ret; |
1773 | ||
9a99dc1c DM |
1774 | ret = tcf_block_cb_call(block, type, type_data, err_stop); |
1775 | if (ret < 0) | |
1776 | return ret; | |
1777 | ok_count = ret; | |
208c0f4b | 1778 | |
f8f4bef3 | 1779 | if (!exts || ok_count) |
9a99dc1c | 1780 | return ok_count; |
208c0f4b JP |
1781 | ret = tc_exts_setup_cb_egdev_call(exts, type, type_data, err_stop); |
1782 | if (ret < 0) | |
1783 | return ret; | |
1784 | ok_count += ret; | |
1785 | ||
1786 | return ok_count; | |
717503b9 JP |
1787 | } |
1788 | EXPORT_SYMBOL(tc_setup_cb_call); | |
b3f55bdd | 1789 | |
48617387 JP |
1790 | static __net_init int tcf_net_init(struct net *net) |
1791 | { | |
1792 | struct tcf_net *tn = net_generic(net, tcf_net_id); | |
1793 | ||
1794 | idr_init(&tn->idr); | |
1795 | return 0; | |
1796 | } | |
1797 | ||
1798 | static void __net_exit tcf_net_exit(struct net *net) | |
1799 | { | |
1800 | struct tcf_net *tn = net_generic(net, tcf_net_id); | |
1801 | ||
1802 | idr_destroy(&tn->idr); | |
1803 | } | |
1804 | ||
1805 | static struct pernet_operations tcf_net_ops = { | |
1806 | .init = tcf_net_init, | |
1807 | .exit = tcf_net_exit, | |
1808 | .id = &tcf_net_id, | |
1809 | .size = sizeof(struct tcf_net), | |
1810 | }; | |
1811 | ||
1da177e4 LT |
1812 | static int __init tc_filter_init(void) |
1813 | { | |
48617387 JP |
1814 | int err; |
1815 | ||
7aa0045d CW |
1816 | tc_filter_wq = alloc_ordered_workqueue("tc_filter_workqueue", 0); |
1817 | if (!tc_filter_wq) | |
1818 | return -ENOMEM; | |
1819 | ||
48617387 JP |
1820 | err = register_pernet_subsys(&tcf_net_ops); |
1821 | if (err) | |
1822 | goto err_register_pernet_subsys; | |
1823 | ||
c431f89b VB |
1824 | rtnl_register(PF_UNSPEC, RTM_NEWTFILTER, tc_new_tfilter, NULL, 0); |
1825 | rtnl_register(PF_UNSPEC, RTM_DELTFILTER, tc_del_tfilter, NULL, 0); | |
1826 | rtnl_register(PF_UNSPEC, RTM_GETTFILTER, tc_get_tfilter, | |
b97bac64 | 1827 | tc_dump_tfilter, 0); |
1da177e4 | 1828 | |
1da177e4 | 1829 | return 0; |
48617387 JP |
1830 | |
1831 | err_register_pernet_subsys: | |
1832 | destroy_workqueue(tc_filter_wq); | |
1833 | return err; | |
1da177e4 LT |
1834 | } |
1835 | ||
1836 | subsys_initcall(tc_filter_init); |