Commit | Line | Data |
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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
2 | /* |
3 | * net/sched/act_api.c Packet action API. | |
4 | * | |
1da177e4 | 5 | * Author: Jamal Hadi Salim |
1da177e4 LT |
6 | */ |
7 | ||
1da177e4 LT |
8 | #include <linux/types.h> |
9 | #include <linux/kernel.h> | |
1da177e4 | 10 | #include <linux/string.h> |
1da177e4 | 11 | #include <linux/errno.h> |
5a0e3ad6 | 12 | #include <linux/slab.h> |
1da177e4 | 13 | #include <linux/skbuff.h> |
1da177e4 LT |
14 | #include <linux/init.h> |
15 | #include <linux/kmod.h> | |
ab27cfb8 | 16 | #include <linux/err.h> |
3a9a231d | 17 | #include <linux/module.h> |
b854272b DL |
18 | #include <net/net_namespace.h> |
19 | #include <net/sock.h> | |
1da177e4 | 20 | #include <net/sch_generic.h> |
1045ba77 | 21 | #include <net/pkt_cls.h> |
8cbfe939 | 22 | #include <net/tc_act/tc_pedit.h> |
1da177e4 | 23 | #include <net/act_api.h> |
dc5fc579 | 24 | #include <net/netlink.h> |
8cbfe939 | 25 | #include <net/flow_offload.h> |
1da177e4 | 26 | |
c129412f | 27 | #ifdef CONFIG_INET |
28 | DEFINE_STATIC_KEY_FALSE(tcf_frag_xmit_count); | |
29 | EXPORT_SYMBOL_GPL(tcf_frag_xmit_count); | |
30 | #endif | |
31 | ||
32 | int tcf_dev_queue_xmit(struct sk_buff *skb, int (*xmit)(struct sk_buff *skb)) | |
33 | { | |
34 | #ifdef CONFIG_INET | |
35 | if (static_branch_unlikely(&tcf_frag_xmit_count)) | |
36 | return sch_frag_xmit_hook(skb, xmit); | |
37 | #endif | |
38 | ||
39 | return xmit(skb); | |
40 | } | |
41 | EXPORT_SYMBOL_GPL(tcf_dev_queue_xmit); | |
42 | ||
db50514f JP |
43 | static void tcf_action_goto_chain_exec(const struct tc_action *a, |
44 | struct tcf_result *res) | |
45 | { | |
ee3bbfe8 | 46 | const struct tcf_chain *chain = rcu_dereference_bh(a->goto_chain); |
db50514f JP |
47 | |
48 | res->goto_tp = rcu_dereference_bh(chain->filter_chain); | |
49 | } | |
50 | ||
eec94fdb VB |
51 | static void tcf_free_cookie_rcu(struct rcu_head *p) |
52 | { | |
53 | struct tc_cookie *cookie = container_of(p, struct tc_cookie, rcu); | |
54 | ||
55 | kfree(cookie->data); | |
56 | kfree(cookie); | |
57 | } | |
58 | ||
59 | static void tcf_set_action_cookie(struct tc_cookie __rcu **old_cookie, | |
60 | struct tc_cookie *new_cookie) | |
61 | { | |
62 | struct tc_cookie *old; | |
63 | ||
0dbc81ea | 64 | old = xchg((__force struct tc_cookie **)old_cookie, new_cookie); |
eec94fdb VB |
65 | if (old) |
66 | call_rcu(&old->rcu, tcf_free_cookie_rcu); | |
67 | } | |
68 | ||
85d0966f DC |
69 | int tcf_action_check_ctrlact(int action, struct tcf_proto *tp, |
70 | struct tcf_chain **newchain, | |
71 | struct netlink_ext_ack *extack) | |
72 | { | |
73 | int opcode = TC_ACT_EXT_OPCODE(action), ret = -EINVAL; | |
74 | u32 chain_index; | |
75 | ||
76 | if (!opcode) | |
77 | ret = action > TC_ACT_VALUE_MAX ? -EINVAL : 0; | |
78 | else if (opcode <= TC_ACT_EXT_OPCODE_MAX || action == TC_ACT_UNSPEC) | |
79 | ret = 0; | |
80 | if (ret) { | |
81 | NL_SET_ERR_MSG(extack, "invalid control action"); | |
82 | goto end; | |
83 | } | |
84 | ||
85 | if (TC_ACT_EXT_CMP(action, TC_ACT_GOTO_CHAIN)) { | |
86 | chain_index = action & TC_ACT_EXT_VAL_MASK; | |
87 | if (!tp || !newchain) { | |
88 | ret = -EINVAL; | |
89 | NL_SET_ERR_MSG(extack, | |
90 | "can't goto NULL proto/chain"); | |
91 | goto end; | |
92 | } | |
93 | *newchain = tcf_chain_get_by_act(tp->chain->block, chain_index); | |
94 | if (!*newchain) { | |
95 | ret = -ENOMEM; | |
96 | NL_SET_ERR_MSG(extack, | |
97 | "can't allocate goto_chain"); | |
98 | } | |
99 | } | |
100 | end: | |
101 | return ret; | |
102 | } | |
103 | EXPORT_SYMBOL(tcf_action_check_ctrlact); | |
104 | ||
105 | struct tcf_chain *tcf_action_set_ctrlact(struct tc_action *a, int action, | |
ee3bbfe8 | 106 | struct tcf_chain *goto_chain) |
85d0966f | 107 | { |
85d0966f | 108 | a->tcfa_action = action; |
445d3749 | 109 | goto_chain = rcu_replace_pointer(a->goto_chain, goto_chain, 1); |
ee3bbfe8 | 110 | return goto_chain; |
85d0966f DC |
111 | } |
112 | EXPORT_SYMBOL(tcf_action_set_ctrlact); | |
113 | ||
d7fb60b9 CW |
114 | /* XXX: For standalone actions, we don't need a RCU grace period either, because |
115 | * actions are always connected to filters and filters are already destroyed in | |
116 | * RCU callbacks, so after a RCU grace period actions are already disconnected | |
117 | * from filters. Readers later can not find us. | |
118 | */ | |
119 | static void free_tcf(struct tc_action *p) | |
519c818e | 120 | { |
ee3bbfe8 | 121 | struct tcf_chain *chain = rcu_dereference_protected(p->goto_chain, 1); |
85d0966f | 122 | |
519c818e | 123 | free_percpu(p->cpu_bstats); |
28169aba | 124 | free_percpu(p->cpu_bstats_hw); |
519c818e | 125 | free_percpu(p->cpu_qstats); |
1045ba77 | 126 | |
eec94fdb | 127 | tcf_set_action_cookie(&p->act_cookie, NULL); |
85d0966f DC |
128 | if (chain) |
129 | tcf_chain_put_by_act(chain); | |
1045ba77 | 130 | |
519c818e ED |
131 | kfree(p); |
132 | } | |
133 | ||
7adc5765 BZ |
134 | static void offload_action_hw_count_set(struct tc_action *act, |
135 | u32 hw_count) | |
136 | { | |
137 | act->in_hw_count = hw_count; | |
138 | } | |
139 | ||
13926d19 BZ |
140 | static void offload_action_hw_count_inc(struct tc_action *act, |
141 | u32 hw_count) | |
142 | { | |
143 | act->in_hw_count += hw_count; | |
144 | } | |
145 | ||
146 | static void offload_action_hw_count_dec(struct tc_action *act, | |
147 | u32 hw_count) | |
148 | { | |
149 | act->in_hw_count = act->in_hw_count > hw_count ? | |
150 | act->in_hw_count - hw_count : 0; | |
151 | } | |
152 | ||
8cbfe939 BZ |
153 | static unsigned int tcf_offload_act_num_actions_single(struct tc_action *act) |
154 | { | |
155 | if (is_tcf_pedit(act)) | |
156 | return tcf_pedit_nkeys(act); | |
157 | else | |
158 | return 1; | |
159 | } | |
160 | ||
7adc5765 BZ |
161 | static bool tc_act_skip_hw(u32 flags) |
162 | { | |
163 | return (flags & TCA_ACT_FLAGS_SKIP_HW) ? true : false; | |
164 | } | |
165 | ||
166 | static bool tc_act_skip_sw(u32 flags) | |
167 | { | |
168 | return (flags & TCA_ACT_FLAGS_SKIP_SW) ? true : false; | |
169 | } | |
170 | ||
171 | static bool tc_act_in_hw(struct tc_action *act) | |
172 | { | |
173 | return !!act->in_hw_count; | |
174 | } | |
175 | ||
176 | /* SKIP_HW and SKIP_SW are mutually exclusive flags. */ | |
177 | static bool tc_act_flags_valid(u32 flags) | |
178 | { | |
179 | flags &= TCA_ACT_FLAGS_SKIP_HW | TCA_ACT_FLAGS_SKIP_SW; | |
180 | ||
181 | return flags ^ (TCA_ACT_FLAGS_SKIP_HW | TCA_ACT_FLAGS_SKIP_SW); | |
182 | } | |
183 | ||
8cbfe939 BZ |
184 | static int offload_action_init(struct flow_offload_action *fl_action, |
185 | struct tc_action *act, | |
186 | enum offload_act_command cmd, | |
187 | struct netlink_ext_ack *extack) | |
188 | { | |
963178a0 BZ |
189 | int err; |
190 | ||
8cbfe939 BZ |
191 | fl_action->extack = extack; |
192 | fl_action->command = cmd; | |
193 | fl_action->index = act->tcfa_index; | |
194 | ||
963178a0 BZ |
195 | if (act->ops->offload_act_setup) { |
196 | spin_lock_bh(&act->tcfa_lock); | |
197 | err = act->ops->offload_act_setup(act, fl_action, NULL, | |
198 | false); | |
199 | spin_unlock_bh(&act->tcfa_lock); | |
200 | return err; | |
201 | } | |
8cbfe939 BZ |
202 | |
203 | return -EOPNOTSUPP; | |
204 | } | |
205 | ||
13926d19 BZ |
206 | static int tcf_action_offload_cmd_ex(struct flow_offload_action *fl_act, |
207 | u32 *hw_count) | |
8cbfe939 BZ |
208 | { |
209 | int err; | |
210 | ||
211 | err = flow_indr_dev_setup_offload(NULL, NULL, TC_SETUP_ACT, | |
212 | fl_act, NULL, NULL); | |
213 | if (err < 0) | |
214 | return err; | |
215 | ||
7adc5765 BZ |
216 | if (hw_count) |
217 | *hw_count = err; | |
218 | ||
8cbfe939 BZ |
219 | return 0; |
220 | } | |
221 | ||
13926d19 BZ |
222 | static int tcf_action_offload_cmd_cb_ex(struct flow_offload_action *fl_act, |
223 | u32 *hw_count, | |
224 | flow_indr_block_bind_cb_t *cb, | |
225 | void *cb_priv) | |
226 | { | |
227 | int err; | |
228 | ||
229 | err = cb(NULL, NULL, cb_priv, TC_SETUP_ACT, NULL, fl_act, NULL); | |
230 | if (err < 0) | |
231 | return err; | |
232 | ||
233 | if (hw_count) | |
234 | *hw_count = 1; | |
235 | ||
236 | return 0; | |
237 | } | |
238 | ||
239 | static int tcf_action_offload_cmd(struct flow_offload_action *fl_act, | |
240 | u32 *hw_count, | |
241 | flow_indr_block_bind_cb_t *cb, | |
242 | void *cb_priv) | |
243 | { | |
244 | return cb ? tcf_action_offload_cmd_cb_ex(fl_act, hw_count, | |
245 | cb, cb_priv) : | |
246 | tcf_action_offload_cmd_ex(fl_act, hw_count); | |
247 | } | |
248 | ||
249 | static int tcf_action_offload_add_ex(struct tc_action *action, | |
250 | struct netlink_ext_ack *extack, | |
251 | flow_indr_block_bind_cb_t *cb, | |
252 | void *cb_priv) | |
8cbfe939 | 253 | { |
7adc5765 | 254 | bool skip_sw = tc_act_skip_sw(action->tcfa_flags); |
8cbfe939 BZ |
255 | struct tc_action *actions[TCA_ACT_MAX_PRIO] = { |
256 | [0] = action, | |
257 | }; | |
258 | struct flow_offload_action *fl_action; | |
7adc5765 | 259 | u32 in_hw_count = 0; |
8cbfe939 BZ |
260 | int num, err = 0; |
261 | ||
7adc5765 BZ |
262 | if (tc_act_skip_hw(action->tcfa_flags)) |
263 | return 0; | |
264 | ||
8cbfe939 BZ |
265 | num = tcf_offload_act_num_actions_single(action); |
266 | fl_action = offload_action_alloc(num); | |
267 | if (!fl_action) | |
268 | return -ENOMEM; | |
269 | ||
270 | err = offload_action_init(fl_action, action, FLOW_ACT_REPLACE, extack); | |
271 | if (err) | |
272 | goto fl_err; | |
273 | ||
274 | err = tc_setup_action(&fl_action->action, actions); | |
275 | if (err) { | |
276 | NL_SET_ERR_MSG_MOD(extack, | |
ecf4a24c | 277 | "Failed to setup tc actions for offload"); |
8cbfe939 BZ |
278 | goto fl_err; |
279 | } | |
280 | ||
13926d19 | 281 | err = tcf_action_offload_cmd(fl_action, &in_hw_count, cb, cb_priv); |
7adc5765 | 282 | if (!err) |
13926d19 BZ |
283 | cb ? offload_action_hw_count_inc(action, in_hw_count) : |
284 | offload_action_hw_count_set(action, in_hw_count); | |
7adc5765 BZ |
285 | |
286 | if (skip_sw && !tc_act_in_hw(action)) | |
287 | err = -EINVAL; | |
288 | ||
8cbfe939 BZ |
289 | tc_cleanup_offload_action(&fl_action->action); |
290 | ||
291 | fl_err: | |
292 | kfree(fl_action); | |
293 | ||
294 | return err; | |
295 | } | |
296 | ||
13926d19 BZ |
297 | /* offload the tc action after it is inserted */ |
298 | static int tcf_action_offload_add(struct tc_action *action, | |
299 | struct netlink_ext_ack *extack) | |
300 | { | |
301 | return tcf_action_offload_add_ex(action, extack, NULL, NULL); | |
302 | } | |
303 | ||
c7a66f8d BZ |
304 | int tcf_action_update_hw_stats(struct tc_action *action) |
305 | { | |
306 | struct flow_offload_action fl_act = {}; | |
307 | int err; | |
308 | ||
309 | if (!tc_act_in_hw(action)) | |
310 | return -EOPNOTSUPP; | |
311 | ||
312 | err = offload_action_init(&fl_act, action, FLOW_ACT_STATS, NULL); | |
313 | if (err) | |
314 | return err; | |
315 | ||
13926d19 | 316 | err = tcf_action_offload_cmd(&fl_act, NULL, NULL, NULL); |
c7a66f8d BZ |
317 | if (!err) { |
318 | preempt_disable(); | |
319 | tcf_action_stats_update(action, fl_act.stats.bytes, | |
320 | fl_act.stats.pkts, | |
321 | fl_act.stats.drops, | |
322 | fl_act.stats.lastused, | |
323 | true); | |
324 | preempt_enable(); | |
325 | action->used_hw_stats = fl_act.stats.used_hw_stats; | |
326 | action->used_hw_stats_valid = true; | |
327 | } else { | |
328 | return -EOPNOTSUPP; | |
329 | } | |
330 | ||
331 | return 0; | |
332 | } | |
333 | EXPORT_SYMBOL(tcf_action_update_hw_stats); | |
334 | ||
13926d19 BZ |
335 | static int tcf_action_offload_del_ex(struct tc_action *action, |
336 | flow_indr_block_bind_cb_t *cb, | |
337 | void *cb_priv) | |
8cbfe939 BZ |
338 | { |
339 | struct flow_offload_action fl_act = {}; | |
7adc5765 | 340 | u32 in_hw_count = 0; |
8cbfe939 BZ |
341 | int err = 0; |
342 | ||
7adc5765 BZ |
343 | if (!tc_act_in_hw(action)) |
344 | return 0; | |
345 | ||
8cbfe939 BZ |
346 | err = offload_action_init(&fl_act, action, FLOW_ACT_DESTROY, NULL); |
347 | if (err) | |
348 | return err; | |
349 | ||
13926d19 BZ |
350 | err = tcf_action_offload_cmd(&fl_act, &in_hw_count, cb, cb_priv); |
351 | if (err < 0) | |
7adc5765 BZ |
352 | return err; |
353 | ||
13926d19 | 354 | if (!cb && action->in_hw_count != in_hw_count) |
7adc5765 BZ |
355 | return -EINVAL; |
356 | ||
13926d19 BZ |
357 | /* do not need to update hw state when deleting action */ |
358 | if (cb && in_hw_count) | |
359 | offload_action_hw_count_dec(action, in_hw_count); | |
360 | ||
7adc5765 | 361 | return 0; |
8cbfe939 BZ |
362 | } |
363 | ||
13926d19 BZ |
364 | static int tcf_action_offload_del(struct tc_action *action) |
365 | { | |
366 | return tcf_action_offload_del_ex(action, NULL, NULL); | |
367 | } | |
368 | ||
16af6067 | 369 | static void tcf_action_cleanup(struct tc_action *p) |
e9ce1cd3 | 370 | { |
8cbfe939 | 371 | tcf_action_offload_del(p); |
16af6067 VB |
372 | if (p->ops->cleanup) |
373 | p->ops->cleanup(p); | |
374 | ||
1c0d32fd | 375 | gen_kill_estimator(&p->tcfa_rate_est); |
d7fb60b9 | 376 | free_tcf(p); |
e9ce1cd3 | 377 | } |
e9ce1cd3 | 378 | |
16af6067 VB |
379 | static int __tcf_action_put(struct tc_action *p, bool bind) |
380 | { | |
381 | struct tcf_idrinfo *idrinfo = p->idrinfo; | |
382 | ||
95278dda | 383 | if (refcount_dec_and_mutex_lock(&p->tcfa_refcnt, &idrinfo->lock)) { |
16af6067 VB |
384 | if (bind) |
385 | atomic_dec(&p->tcfa_bindcnt); | |
386 | idr_remove(&idrinfo->action_idr, p->tcfa_index); | |
95278dda | 387 | mutex_unlock(&idrinfo->lock); |
16af6067 VB |
388 | |
389 | tcf_action_cleanup(p); | |
390 | return 1; | |
391 | } | |
392 | ||
393 | if (bind) | |
394 | atomic_dec(&p->tcfa_bindcnt); | |
395 | ||
396 | return 0; | |
397 | } | |
398 | ||
b3650bf7 | 399 | static int __tcf_idr_release(struct tc_action *p, bool bind, bool strict) |
e9ce1cd3 DM |
400 | { |
401 | int ret = 0; | |
402 | ||
036bb443 VB |
403 | /* Release with strict==1 and bind==0 is only called through act API |
404 | * interface (classifiers always bind). Only case when action with | |
405 | * positive reference count and zero bind count can exist is when it was | |
406 | * also created with act API (unbinding last classifier will destroy the | |
407 | * action if it was created by classifier). So only case when bind count | |
408 | * can be changed after initial check is when unbound action is | |
409 | * destroyed by act API while classifier binds to action with same id | |
410 | * concurrently. This result either creation of new action(same behavior | |
411 | * as before), or reusing existing action if concurrent process | |
412 | * increments reference count before action is deleted. Both scenarios | |
413 | * are acceptable. | |
414 | */ | |
e9ce1cd3 | 415 | if (p) { |
16af6067 | 416 | if (!bind && strict && atomic_read(&p->tcfa_bindcnt) > 0) |
55334a5d | 417 | return -EPERM; |
e9ce1cd3 | 418 | |
16af6067 | 419 | if (__tcf_action_put(p, bind)) |
1d4150c0 | 420 | ret = ACT_P_DELETED; |
e9ce1cd3 | 421 | } |
28e6b67f | 422 | |
e9ce1cd3 DM |
423 | return ret; |
424 | } | |
b3650bf7 VB |
425 | |
426 | int tcf_idr_release(struct tc_action *a, bool bind) | |
427 | { | |
428 | const struct tc_action_ops *ops = a->ops; | |
429 | int ret; | |
430 | ||
431 | ret = __tcf_idr_release(a, bind, false); | |
432 | if (ret == ACT_P_DELETED) | |
433 | module_put(ops->owner); | |
434 | return ret; | |
435 | } | |
436 | EXPORT_SYMBOL(tcf_idr_release); | |
e9ce1cd3 | 437 | |
4e76e75d RM |
438 | static size_t tcf_action_shared_attrs_size(const struct tc_action *act) |
439 | { | |
e0479b67 | 440 | struct tc_cookie *act_cookie; |
4e76e75d RM |
441 | u32 cookie_len = 0; |
442 | ||
e0479b67 VB |
443 | rcu_read_lock(); |
444 | act_cookie = rcu_dereference(act->act_cookie); | |
445 | ||
446 | if (act_cookie) | |
447 | cookie_len = nla_total_size(act_cookie->len); | |
448 | rcu_read_unlock(); | |
4e76e75d RM |
449 | |
450 | return nla_total_size(0) /* action number nested */ | |
451 | + nla_total_size(IFNAMSIZ) /* TCA_ACT_KIND */ | |
452 | + cookie_len /* TCA_ACT_COOKIE */ | |
0dfb2d82 | 453 | + nla_total_size(sizeof(struct nla_bitfield32)) /* TCA_ACT_HW_STATS */ |
4e76e75d | 454 | + nla_total_size(0) /* TCA_ACT_STATS nested */ |
1521a67e | 455 | + nla_total_size(sizeof(struct nla_bitfield32)) /* TCA_ACT_FLAGS */ |
4e76e75d RM |
456 | /* TCA_STATS_BASIC */ |
457 | + nla_total_size_64bit(sizeof(struct gnet_stats_basic)) | |
b33e699f ED |
458 | /* TCA_STATS_PKT64 */ |
459 | + nla_total_size_64bit(sizeof(u64)) | |
4e76e75d RM |
460 | /* TCA_STATS_QUEUE */ |
461 | + nla_total_size_64bit(sizeof(struct gnet_stats_queue)) | |
462 | + nla_total_size(0) /* TCA_OPTIONS nested */ | |
463 | + nla_total_size(sizeof(struct tcf_t)); /* TCA_GACT_TM */ | |
464 | } | |
465 | ||
466 | static size_t tcf_action_full_attrs_size(size_t sz) | |
467 | { | |
468 | return NLMSG_HDRLEN /* struct nlmsghdr */ | |
469 | + sizeof(struct tcamsg) | |
470 | + nla_total_size(0) /* TCA_ACT_TAB nested */ | |
471 | + sz; | |
472 | } | |
473 | ||
474 | static size_t tcf_action_fill_size(const struct tc_action *act) | |
475 | { | |
476 | size_t sz = tcf_action_shared_attrs_size(act); | |
477 | ||
478 | if (act->ops->get_fill_size) | |
479 | return act->ops->get_fill_size(act) + sz; | |
480 | return sz; | |
481 | } | |
482 | ||
94f44f28 VB |
483 | static int |
484 | tcf_action_dump_terse(struct sk_buff *skb, struct tc_action *a, bool from_act) | |
485 | { | |
486 | unsigned char *b = skb_tail_pointer(skb); | |
487 | struct tc_cookie *cookie; | |
488 | ||
489 | if (nla_put_string(skb, TCA_KIND, a->ops->kind)) | |
490 | goto nla_put_failure; | |
491 | if (tcf_action_copy_stats(skb, a, 0)) | |
492 | goto nla_put_failure; | |
493 | if (from_act && nla_put_u32(skb, TCA_ACT_INDEX, a->tcfa_index)) | |
494 | goto nla_put_failure; | |
495 | ||
496 | rcu_read_lock(); | |
497 | cookie = rcu_dereference(a->act_cookie); | |
498 | if (cookie) { | |
499 | if (nla_put(skb, TCA_ACT_COOKIE, cookie->len, cookie->data)) { | |
500 | rcu_read_unlock(); | |
501 | goto nla_put_failure; | |
502 | } | |
503 | } | |
504 | rcu_read_unlock(); | |
505 | ||
506 | return 0; | |
507 | ||
508 | nla_put_failure: | |
509 | nlmsg_trim(skb, b); | |
510 | return -1; | |
511 | } | |
512 | ||
65a206c0 | 513 | static int tcf_dump_walker(struct tcf_idrinfo *idrinfo, struct sk_buff *skb, |
a85a970a | 514 | struct netlink_callback *cb) |
e9ce1cd3 | 515 | { |
65a206c0 | 516 | int err = 0, index = -1, s_i = 0, n_i = 0; |
90825b23 | 517 | u32 act_flags = cb->args[2]; |
e62e484d | 518 | unsigned long jiffy_since = cb->args[3]; |
4b3550ef | 519 | struct nlattr *nest; |
65a206c0 CM |
520 | struct idr *idr = &idrinfo->action_idr; |
521 | struct tc_action *p; | |
522 | unsigned long id = 1; | |
e33d2b74 | 523 | unsigned long tmp; |
e9ce1cd3 | 524 | |
95278dda | 525 | mutex_lock(&idrinfo->lock); |
e9ce1cd3 DM |
526 | |
527 | s_i = cb->args[0]; | |
528 | ||
e33d2b74 | 529 | idr_for_each_entry_ul(idr, p, tmp, id) { |
65a206c0 CM |
530 | index++; |
531 | if (index < s_i) | |
532 | continue; | |
580e4273 CW |
533 | if (IS_ERR(p)) |
534 | continue; | |
65a206c0 CM |
535 | |
536 | if (jiffy_since && | |
537 | time_after(jiffy_since, | |
538 | (unsigned long)p->tcfa_tm.lastuse)) | |
539 | continue; | |
540 | ||
ae0be8de | 541 | nest = nla_nest_start_noflag(skb, n_i); |
734549eb CD |
542 | if (!nest) { |
543 | index--; | |
65a206c0 | 544 | goto nla_put_failure; |
734549eb | 545 | } |
f460019b | 546 | err = (act_flags & TCA_ACT_FLAG_TERSE_DUMP) ? |
94f44f28 VB |
547 | tcf_action_dump_terse(skb, p, true) : |
548 | tcf_action_dump_1(skb, p, 0, 0); | |
65a206c0 CM |
549 | if (err < 0) { |
550 | index--; | |
551 | nlmsg_trim(skb, nest); | |
552 | goto done; | |
e9ce1cd3 | 553 | } |
65a206c0 CM |
554 | nla_nest_end(skb, nest); |
555 | n_i++; | |
f460019b | 556 | if (!(act_flags & TCA_ACT_FLAG_LARGE_DUMP_ON) && |
65a206c0 CM |
557 | n_i >= TCA_ACT_MAX_PRIO) |
558 | goto done; | |
e9ce1cd3 DM |
559 | } |
560 | done: | |
e62e484d JHS |
561 | if (index >= 0) |
562 | cb->args[0] = index + 1; | |
563 | ||
95278dda | 564 | mutex_unlock(&idrinfo->lock); |
90825b23 | 565 | if (n_i) { |
f460019b | 566 | if (act_flags & TCA_ACT_FLAG_LARGE_DUMP_ON) |
90825b23 JHS |
567 | cb->args[1] = n_i; |
568 | } | |
e9ce1cd3 DM |
569 | return n_i; |
570 | ||
7ba699c6 | 571 | nla_put_failure: |
4b3550ef | 572 | nla_nest_cancel(skb, nest); |
e9ce1cd3 DM |
573 | goto done; |
574 | } | |
575 | ||
ec3ed293 VB |
576 | static int tcf_idr_release_unsafe(struct tc_action *p) |
577 | { | |
578 | if (atomic_read(&p->tcfa_bindcnt) > 0) | |
579 | return -EPERM; | |
580 | ||
581 | if (refcount_dec_and_test(&p->tcfa_refcnt)) { | |
582 | idr_remove(&p->idrinfo->action_idr, p->tcfa_index); | |
583 | tcf_action_cleanup(p); | |
584 | return ACT_P_DELETED; | |
585 | } | |
586 | ||
587 | return 0; | |
588 | } | |
589 | ||
65a206c0 | 590 | static int tcf_del_walker(struct tcf_idrinfo *idrinfo, struct sk_buff *skb, |
a85a970a | 591 | const struct tc_action_ops *ops) |
e9ce1cd3 | 592 | { |
4b3550ef | 593 | struct nlattr *nest; |
65a206c0 | 594 | int n_i = 0; |
55334a5d | 595 | int ret = -EINVAL; |
65a206c0 CM |
596 | struct idr *idr = &idrinfo->action_idr; |
597 | struct tc_action *p; | |
598 | unsigned long id = 1; | |
e33d2b74 | 599 | unsigned long tmp; |
e9ce1cd3 | 600 | |
ae0be8de | 601 | nest = nla_nest_start_noflag(skb, 0); |
4b3550ef PM |
602 | if (nest == NULL) |
603 | goto nla_put_failure; | |
a85a970a | 604 | if (nla_put_string(skb, TCA_KIND, ops->kind)) |
1b34ec43 | 605 | goto nla_put_failure; |
65a206c0 | 606 | |
95278dda | 607 | mutex_lock(&idrinfo->lock); |
e33d2b74 | 608 | idr_for_each_entry_ul(idr, p, tmp, id) { |
0fedc63f CW |
609 | if (IS_ERR(p)) |
610 | continue; | |
ec3ed293 | 611 | ret = tcf_idr_release_unsafe(p); |
65a206c0 | 612 | if (ret == ACT_P_DELETED) { |
255cd50f | 613 | module_put(ops->owner); |
65a206c0 CM |
614 | n_i++; |
615 | } else if (ret < 0) { | |
95278dda | 616 | mutex_unlock(&idrinfo->lock); |
65a206c0 | 617 | goto nla_put_failure; |
e9ce1cd3 DM |
618 | } |
619 | } | |
95278dda | 620 | mutex_unlock(&idrinfo->lock); |
ec3ed293 | 621 | |
55d96f72 YY |
622 | ret = nla_put_u32(skb, TCA_FCNT, n_i); |
623 | if (ret) | |
1b34ec43 | 624 | goto nla_put_failure; |
4b3550ef | 625 | nla_nest_end(skb, nest); |
e9ce1cd3 DM |
626 | |
627 | return n_i; | |
7ba699c6 | 628 | nla_put_failure: |
4b3550ef | 629 | nla_nest_cancel(skb, nest); |
55334a5d | 630 | return ret; |
e9ce1cd3 DM |
631 | } |
632 | ||
ddf97ccd WC |
633 | int tcf_generic_walker(struct tc_action_net *tn, struct sk_buff *skb, |
634 | struct netlink_callback *cb, int type, | |
b3620145 AA |
635 | const struct tc_action_ops *ops, |
636 | struct netlink_ext_ack *extack) | |
e9ce1cd3 | 637 | { |
65a206c0 | 638 | struct tcf_idrinfo *idrinfo = tn->idrinfo; |
ddf97ccd | 639 | |
e9ce1cd3 | 640 | if (type == RTM_DELACTION) { |
65a206c0 | 641 | return tcf_del_walker(idrinfo, skb, ops); |
e9ce1cd3 | 642 | } else if (type == RTM_GETACTION) { |
65a206c0 | 643 | return tcf_dump_walker(idrinfo, skb, cb); |
e9ce1cd3 | 644 | } else { |
b3620145 AA |
645 | WARN(1, "tcf_generic_walker: unknown command %d\n", type); |
646 | NL_SET_ERR_MSG(extack, "tcf_generic_walker: unknown command"); | |
e9ce1cd3 DM |
647 | return -EINVAL; |
648 | } | |
649 | } | |
ddf97ccd | 650 | EXPORT_SYMBOL(tcf_generic_walker); |
e9ce1cd3 | 651 | |
7d485c45 | 652 | int tcf_idr_search(struct tc_action_net *tn, struct tc_action **a, u32 index) |
e9ce1cd3 | 653 | { |
3f7c72bc VB |
654 | struct tcf_idrinfo *idrinfo = tn->idrinfo; |
655 | struct tc_action *p; | |
e9ce1cd3 | 656 | |
95278dda | 657 | mutex_lock(&idrinfo->lock); |
322d884b | 658 | p = idr_find(&idrinfo->action_idr, index); |
7d485c45 | 659 | if (IS_ERR(p)) |
0190c1d4 | 660 | p = NULL; |
7d485c45 | 661 | else if (p) |
3f7c72bc | 662 | refcount_inc(&p->tcfa_refcnt); |
95278dda | 663 | mutex_unlock(&idrinfo->lock); |
e9ce1cd3 | 664 | |
3f7c72bc VB |
665 | if (p) { |
666 | *a = p; | |
667 | return true; | |
668 | } | |
669 | return false; | |
e9ce1cd3 | 670 | } |
65a206c0 | 671 | EXPORT_SYMBOL(tcf_idr_search); |
e9ce1cd3 | 672 | |
97a3f84f | 673 | static int tcf_idr_delete_index(struct tcf_idrinfo *idrinfo, u32 index) |
2a2ea349 | 674 | { |
2a2ea349 VB |
675 | struct tc_action *p; |
676 | int ret = 0; | |
677 | ||
95278dda | 678 | mutex_lock(&idrinfo->lock); |
2a2ea349 VB |
679 | p = idr_find(&idrinfo->action_idr, index); |
680 | if (!p) { | |
95278dda | 681 | mutex_unlock(&idrinfo->lock); |
2a2ea349 VB |
682 | return -ENOENT; |
683 | } | |
684 | ||
685 | if (!atomic_read(&p->tcfa_bindcnt)) { | |
686 | if (refcount_dec_and_test(&p->tcfa_refcnt)) { | |
687 | struct module *owner = p->ops->owner; | |
688 | ||
689 | WARN_ON(p != idr_remove(&idrinfo->action_idr, | |
690 | p->tcfa_index)); | |
95278dda | 691 | mutex_unlock(&idrinfo->lock); |
2a2ea349 | 692 | |
16af6067 | 693 | tcf_action_cleanup(p); |
2a2ea349 VB |
694 | module_put(owner); |
695 | return 0; | |
696 | } | |
697 | ret = 0; | |
698 | } else { | |
699 | ret = -EPERM; | |
700 | } | |
701 | ||
95278dda | 702 | mutex_unlock(&idrinfo->lock); |
2a2ea349 VB |
703 | return ret; |
704 | } | |
2a2ea349 | 705 | |
65a206c0 CM |
706 | int tcf_idr_create(struct tc_action_net *tn, u32 index, struct nlattr *est, |
707 | struct tc_action **a, const struct tc_action_ops *ops, | |
e3822678 | 708 | int bind, bool cpustats, u32 flags) |
e9ce1cd3 | 709 | { |
ec0595cc | 710 | struct tc_action *p = kzalloc(ops->size, GFP_KERNEL); |
65a206c0 | 711 | struct tcf_idrinfo *idrinfo = tn->idrinfo; |
519c818e | 712 | int err = -ENOMEM; |
e9ce1cd3 DM |
713 | |
714 | if (unlikely(!p)) | |
86062033 | 715 | return -ENOMEM; |
036bb443 | 716 | refcount_set(&p->tcfa_refcnt, 1); |
e9ce1cd3 | 717 | if (bind) |
036bb443 | 718 | atomic_set(&p->tcfa_bindcnt, 1); |
e9ce1cd3 | 719 | |
519c818e | 720 | if (cpustats) { |
50dc9a85 | 721 | p->cpu_bstats = netdev_alloc_pcpu_stats(struct gnet_stats_basic_sync); |
339913a8 | 722 | if (!p->cpu_bstats) |
519c818e | 723 | goto err1; |
50dc9a85 | 724 | p->cpu_bstats_hw = netdev_alloc_pcpu_stats(struct gnet_stats_basic_sync); |
28169aba EC |
725 | if (!p->cpu_bstats_hw) |
726 | goto err2; | |
339913a8 MW |
727 | p->cpu_qstats = alloc_percpu(struct gnet_stats_queue); |
728 | if (!p->cpu_qstats) | |
28169aba | 729 | goto err3; |
519c818e | 730 | } |
50dc9a85 AD |
731 | gnet_stats_basic_sync_init(&p->tcfa_bstats); |
732 | gnet_stats_basic_sync_init(&p->tcfa_bstats_hw); | |
ec0595cc | 733 | spin_lock_init(&p->tcfa_lock); |
339913a8 | 734 | p->tcfa_index = index; |
ec0595cc WC |
735 | p->tcfa_tm.install = jiffies; |
736 | p->tcfa_tm.lastuse = jiffies; | |
737 | p->tcfa_tm.firstuse = 0; | |
e8cb5bcf | 738 | p->tcfa_flags = flags; |
0e991ec6 | 739 | if (est) { |
ec0595cc WC |
740 | err = gen_new_estimator(&p->tcfa_bstats, p->cpu_bstats, |
741 | &p->tcfa_rate_est, | |
29cbcd85 | 742 | &p->tcfa_lock, false, est); |
339913a8 | 743 | if (err) |
28169aba | 744 | goto err4; |
0e991ec6 SH |
745 | } |
746 | ||
65a206c0 | 747 | p->idrinfo = idrinfo; |
b3650bf7 | 748 | __module_get(ops->owner); |
ec0595cc | 749 | p->ops = ops; |
ec0595cc | 750 | *a = p; |
86062033 | 751 | return 0; |
28169aba | 752 | err4: |
339913a8 | 753 | free_percpu(p->cpu_qstats); |
28169aba EC |
754 | err3: |
755 | free_percpu(p->cpu_bstats_hw); | |
339913a8 MW |
756 | err2: |
757 | free_percpu(p->cpu_bstats); | |
758 | err1: | |
759 | kfree(p); | |
760 | return err; | |
e9ce1cd3 | 761 | } |
65a206c0 | 762 | EXPORT_SYMBOL(tcf_idr_create); |
e9ce1cd3 | 763 | |
e3822678 VB |
764 | int tcf_idr_create_from_flags(struct tc_action_net *tn, u32 index, |
765 | struct nlattr *est, struct tc_action **a, | |
766 | const struct tc_action_ops *ops, int bind, | |
767 | u32 flags) | |
768 | { | |
769 | /* Set cpustats according to actions flags. */ | |
770 | return tcf_idr_create(tn, index, est, a, ops, bind, | |
771 | !(flags & TCA_ACT_FLAGS_NO_PERCPU_STATS), flags); | |
772 | } | |
773 | EXPORT_SYMBOL(tcf_idr_create_from_flags); | |
774 | ||
0190c1d4 VB |
775 | /* Cleanup idr index that was allocated but not initialized. */ |
776 | ||
777 | void tcf_idr_cleanup(struct tc_action_net *tn, u32 index) | |
778 | { | |
779 | struct tcf_idrinfo *idrinfo = tn->idrinfo; | |
780 | ||
95278dda | 781 | mutex_lock(&idrinfo->lock); |
0190c1d4 VB |
782 | /* Remove ERR_PTR(-EBUSY) allocated by tcf_idr_check_alloc */ |
783 | WARN_ON(!IS_ERR(idr_remove(&idrinfo->action_idr, index))); | |
95278dda | 784 | mutex_unlock(&idrinfo->lock); |
0190c1d4 VB |
785 | } |
786 | EXPORT_SYMBOL(tcf_idr_cleanup); | |
787 | ||
788 | /* Check if action with specified index exists. If actions is found, increments | |
789 | * its reference and bind counters, and return 1. Otherwise insert temporary | |
790 | * error pointer (to prevent concurrent users from inserting actions with same | |
791 | * index) and return 0. | |
792 | */ | |
793 | ||
794 | int tcf_idr_check_alloc(struct tc_action_net *tn, u32 *index, | |
795 | struct tc_action **a, int bind) | |
796 | { | |
797 | struct tcf_idrinfo *idrinfo = tn->idrinfo; | |
798 | struct tc_action *p; | |
799 | int ret; | |
800 | ||
801 | again: | |
95278dda | 802 | mutex_lock(&idrinfo->lock); |
0190c1d4 VB |
803 | if (*index) { |
804 | p = idr_find(&idrinfo->action_idr, *index); | |
805 | if (IS_ERR(p)) { | |
806 | /* This means that another process allocated | |
807 | * index but did not assign the pointer yet. | |
808 | */ | |
95278dda | 809 | mutex_unlock(&idrinfo->lock); |
0190c1d4 VB |
810 | goto again; |
811 | } | |
812 | ||
813 | if (p) { | |
814 | refcount_inc(&p->tcfa_refcnt); | |
815 | if (bind) | |
816 | atomic_inc(&p->tcfa_bindcnt); | |
817 | *a = p; | |
818 | ret = 1; | |
819 | } else { | |
820 | *a = NULL; | |
821 | ret = idr_alloc_u32(&idrinfo->action_idr, NULL, index, | |
95278dda | 822 | *index, GFP_KERNEL); |
0190c1d4 VB |
823 | if (!ret) |
824 | idr_replace(&idrinfo->action_idr, | |
825 | ERR_PTR(-EBUSY), *index); | |
826 | } | |
827 | } else { | |
828 | *index = 1; | |
829 | *a = NULL; | |
830 | ret = idr_alloc_u32(&idrinfo->action_idr, NULL, index, | |
95278dda | 831 | UINT_MAX, GFP_KERNEL); |
0190c1d4 VB |
832 | if (!ret) |
833 | idr_replace(&idrinfo->action_idr, ERR_PTR(-EBUSY), | |
834 | *index); | |
835 | } | |
95278dda | 836 | mutex_unlock(&idrinfo->lock); |
0190c1d4 VB |
837 | return ret; |
838 | } | |
839 | EXPORT_SYMBOL(tcf_idr_check_alloc); | |
840 | ||
65a206c0 CM |
841 | void tcf_idrinfo_destroy(const struct tc_action_ops *ops, |
842 | struct tcf_idrinfo *idrinfo) | |
1d4150c0 | 843 | { |
65a206c0 CM |
844 | struct idr *idr = &idrinfo->action_idr; |
845 | struct tc_action *p; | |
846 | int ret; | |
847 | unsigned long id = 1; | |
e33d2b74 | 848 | unsigned long tmp; |
1d4150c0 | 849 | |
e33d2b74 | 850 | idr_for_each_entry_ul(idr, p, tmp, id) { |
65a206c0 CM |
851 | ret = __tcf_idr_release(p, false, true); |
852 | if (ret == ACT_P_DELETED) | |
853 | module_put(ops->owner); | |
854 | else if (ret < 0) | |
855 | return; | |
1d4150c0 | 856 | } |
65a206c0 | 857 | idr_destroy(&idrinfo->action_idr); |
1d4150c0 | 858 | } |
65a206c0 | 859 | EXPORT_SYMBOL(tcf_idrinfo_destroy); |
1d4150c0 | 860 | |
1f747c26 | 861 | static LIST_HEAD(act_base); |
1da177e4 | 862 | static DEFINE_RWLOCK(act_mod_lock); |
13926d19 BZ |
863 | /* since act ops id is stored in pernet subsystem list, |
864 | * then there is no way to walk through only all the action | |
865 | * subsystem, so we keep tc action pernet ops id for | |
866 | * reoffload to walk through. | |
867 | */ | |
868 | static LIST_HEAD(act_pernet_id_list); | |
869 | static DEFINE_MUTEX(act_id_mutex); | |
870 | struct tc_act_pernet_id { | |
871 | struct list_head list; | |
872 | unsigned int id; | |
873 | }; | |
874 | ||
875 | static int tcf_pernet_add_id_list(unsigned int id) | |
876 | { | |
877 | struct tc_act_pernet_id *id_ptr; | |
878 | int ret = 0; | |
879 | ||
880 | mutex_lock(&act_id_mutex); | |
881 | list_for_each_entry(id_ptr, &act_pernet_id_list, list) { | |
882 | if (id_ptr->id == id) { | |
883 | ret = -EEXIST; | |
884 | goto err_out; | |
885 | } | |
886 | } | |
887 | ||
888 | id_ptr = kzalloc(sizeof(*id_ptr), GFP_KERNEL); | |
889 | if (!id_ptr) { | |
890 | ret = -ENOMEM; | |
891 | goto err_out; | |
892 | } | |
893 | id_ptr->id = id; | |
894 | ||
895 | list_add_tail(&id_ptr->list, &act_pernet_id_list); | |
896 | ||
897 | err_out: | |
898 | mutex_unlock(&act_id_mutex); | |
899 | return ret; | |
900 | } | |
901 | ||
902 | static void tcf_pernet_del_id_list(unsigned int id) | |
903 | { | |
904 | struct tc_act_pernet_id *id_ptr; | |
905 | ||
906 | mutex_lock(&act_id_mutex); | |
907 | list_for_each_entry(id_ptr, &act_pernet_id_list, list) { | |
908 | if (id_ptr->id == id) { | |
909 | list_del(&id_ptr->list); | |
910 | kfree(id_ptr); | |
911 | break; | |
912 | } | |
913 | } | |
914 | mutex_unlock(&act_id_mutex); | |
915 | } | |
1da177e4 | 916 | |
ddf97ccd WC |
917 | int tcf_register_action(struct tc_action_ops *act, |
918 | struct pernet_operations *ops) | |
1da177e4 | 919 | { |
1f747c26 | 920 | struct tc_action_ops *a; |
ddf97ccd | 921 | int ret; |
1da177e4 | 922 | |
ddf97ccd | 923 | if (!act->act || !act->dump || !act->init || !act->walk || !act->lookup) |
76c82d7a JHS |
924 | return -EINVAL; |
925 | ||
ab102b80 WC |
926 | /* We have to register pernet ops before making the action ops visible, |
927 | * otherwise tcf_action_init_1() could get a partially initialized | |
928 | * netns. | |
929 | */ | |
930 | ret = register_pernet_subsys(ops); | |
931 | if (ret) | |
932 | return ret; | |
933 | ||
13926d19 BZ |
934 | if (ops->id) { |
935 | ret = tcf_pernet_add_id_list(*ops->id); | |
936 | if (ret) | |
937 | goto err_id; | |
938 | } | |
939 | ||
1da177e4 | 940 | write_lock(&act_mod_lock); |
1f747c26 | 941 | list_for_each_entry(a, &act_base, head) { |
eddd2cf1 | 942 | if (act->id == a->id || (strcmp(act->kind, a->kind) == 0)) { |
13926d19 BZ |
943 | ret = -EEXIST; |
944 | goto err_out; | |
1da177e4 LT |
945 | } |
946 | } | |
1f747c26 | 947 | list_add_tail(&act->head, &act_base); |
1da177e4 | 948 | write_unlock(&act_mod_lock); |
ddf97ccd | 949 | |
1da177e4 | 950 | return 0; |
13926d19 BZ |
951 | |
952 | err_out: | |
953 | write_unlock(&act_mod_lock); | |
954 | if (ops->id) | |
955 | tcf_pernet_del_id_list(*ops->id); | |
956 | err_id: | |
957 | unregister_pernet_subsys(ops); | |
958 | return ret; | |
1da177e4 | 959 | } |
62e3ba1b | 960 | EXPORT_SYMBOL(tcf_register_action); |
1da177e4 | 961 | |
ddf97ccd WC |
962 | int tcf_unregister_action(struct tc_action_ops *act, |
963 | struct pernet_operations *ops) | |
1da177e4 | 964 | { |
1f747c26 | 965 | struct tc_action_ops *a; |
1da177e4 LT |
966 | int err = -ENOENT; |
967 | ||
968 | write_lock(&act_mod_lock); | |
a792866a ED |
969 | list_for_each_entry(a, &act_base, head) { |
970 | if (a == act) { | |
971 | list_del(&act->head); | |
972 | err = 0; | |
1da177e4 | 973 | break; |
a792866a | 974 | } |
1da177e4 LT |
975 | } |
976 | write_unlock(&act_mod_lock); | |
13926d19 | 977 | if (!err) { |
ab102b80 | 978 | unregister_pernet_subsys(ops); |
13926d19 BZ |
979 | if (ops->id) |
980 | tcf_pernet_del_id_list(*ops->id); | |
981 | } | |
1da177e4 LT |
982 | return err; |
983 | } | |
62e3ba1b | 984 | EXPORT_SYMBOL(tcf_unregister_action); |
1da177e4 LT |
985 | |
986 | /* lookup by name */ | |
987 | static struct tc_action_ops *tc_lookup_action_n(char *kind) | |
988 | { | |
a792866a | 989 | struct tc_action_ops *a, *res = NULL; |
1da177e4 LT |
990 | |
991 | if (kind) { | |
992 | read_lock(&act_mod_lock); | |
1f747c26 | 993 | list_for_each_entry(a, &act_base, head) { |
1da177e4 | 994 | if (strcmp(kind, a->kind) == 0) { |
a792866a ED |
995 | if (try_module_get(a->owner)) |
996 | res = a; | |
1da177e4 LT |
997 | break; |
998 | } | |
999 | } | |
1000 | read_unlock(&act_mod_lock); | |
1001 | } | |
a792866a | 1002 | return res; |
1da177e4 LT |
1003 | } |
1004 | ||
7ba699c6 PM |
1005 | /* lookup by nlattr */ |
1006 | static struct tc_action_ops *tc_lookup_action(struct nlattr *kind) | |
1da177e4 | 1007 | { |
a792866a | 1008 | struct tc_action_ops *a, *res = NULL; |
1da177e4 LT |
1009 | |
1010 | if (kind) { | |
1011 | read_lock(&act_mod_lock); | |
1f747c26 | 1012 | list_for_each_entry(a, &act_base, head) { |
7ba699c6 | 1013 | if (nla_strcmp(kind, a->kind) == 0) { |
a792866a ED |
1014 | if (try_module_get(a->owner)) |
1015 | res = a; | |
1da177e4 LT |
1016 | break; |
1017 | } | |
1018 | } | |
1019 | read_unlock(&act_mod_lock); | |
1020 | } | |
a792866a | 1021 | return res; |
1da177e4 | 1022 | } |
1da177e4 | 1023 | |
e5a4b17d | 1024 | /*TCA_ACT_MAX_PRIO is 32, there count up to 32 */ |
e0ee84de | 1025 | #define TCA_ACT_MAX_PRIO_MASK 0x1FF |
22dc13c8 WC |
1026 | int tcf_action_exec(struct sk_buff *skb, struct tc_action **actions, |
1027 | int nr_actions, struct tcf_result *res) | |
1da177e4 | 1028 | { |
e0ee84de JHS |
1029 | u32 jmp_prgcnt = 0; |
1030 | u32 jmp_ttl = TCA_ACT_MAX_PRIO; /*matches actions per filter */ | |
ec1a9cca JP |
1031 | int i; |
1032 | int ret = TC_ACT_OK; | |
1da177e4 | 1033 | |
e7246e12 WB |
1034 | if (skb_skip_tc_classify(skb)) |
1035 | return TC_ACT_OK; | |
1036 | ||
e0ee84de | 1037 | restart_act_graph: |
22dc13c8 WC |
1038 | for (i = 0; i < nr_actions; i++) { |
1039 | const struct tc_action *a = actions[i]; | |
5740d068 | 1040 | int repeat_ttl; |
22dc13c8 | 1041 | |
e0ee84de JHS |
1042 | if (jmp_prgcnt > 0) { |
1043 | jmp_prgcnt -= 1; | |
1044 | continue; | |
1045 | } | |
7adc5765 BZ |
1046 | |
1047 | if (tc_act_skip_sw(a->tcfa_flags)) | |
1048 | continue; | |
5740d068 ED |
1049 | |
1050 | repeat_ttl = 32; | |
1da177e4 | 1051 | repeat: |
63acd680 | 1052 | ret = a->ops->act(skb, a, res); |
5740d068 ED |
1053 | if (unlikely(ret == TC_ACT_REPEAT)) { |
1054 | if (--repeat_ttl != 0) | |
1055 | goto repeat; | |
1056 | /* suspicious opcode, stop pipeline */ | |
1057 | net_warn_ratelimited("TC_ACT_REPEAT abuse ?\n"); | |
1058 | return TC_ACT_OK; | |
1059 | } | |
9da3242e | 1060 | if (TC_ACT_EXT_CMP(ret, TC_ACT_JUMP)) { |
e0ee84de JHS |
1061 | jmp_prgcnt = ret & TCA_ACT_MAX_PRIO_MASK; |
1062 | if (!jmp_prgcnt || (jmp_prgcnt > nr_actions)) { | |
1063 | /* faulty opcode, stop pipeline */ | |
1064 | return TC_ACT_OK; | |
1065 | } else { | |
1066 | jmp_ttl -= 1; | |
1067 | if (jmp_ttl > 0) | |
1068 | goto restart_act_graph; | |
1069 | else /* faulty graph, stop pipeline */ | |
1070 | return TC_ACT_OK; | |
1071 | } | |
db50514f | 1072 | } else if (TC_ACT_EXT_CMP(ret, TC_ACT_GOTO_CHAIN)) { |
ee3bbfe8 DC |
1073 | if (unlikely(!rcu_access_pointer(a->goto_chain))) { |
1074 | net_warn_ratelimited("can't go to NULL chain!\n"); | |
1075 | return TC_ACT_SHOT; | |
1076 | } | |
db50514f | 1077 | tcf_action_goto_chain_exec(a, res); |
e0ee84de JHS |
1078 | } |
1079 | ||
63acd680 | 1080 | if (ret != TC_ACT_PIPE) |
e7246e12 | 1081 | break; |
1da177e4 | 1082 | } |
e0ee84de | 1083 | |
1da177e4 LT |
1084 | return ret; |
1085 | } | |
62e3ba1b | 1086 | EXPORT_SYMBOL(tcf_action_exec); |
1da177e4 | 1087 | |
90b73b77 | 1088 | int tcf_action_destroy(struct tc_action *actions[], int bind) |
1da177e4 | 1089 | { |
255cd50f | 1090 | const struct tc_action_ops *ops; |
90b73b77 VB |
1091 | struct tc_action *a; |
1092 | int ret = 0, i; | |
1da177e4 | 1093 | |
90b73b77 VB |
1094 | for (i = 0; i < TCA_ACT_MAX_PRIO && actions[i]; i++) { |
1095 | a = actions[i]; | |
1096 | actions[i] = NULL; | |
255cd50f | 1097 | ops = a->ops; |
65a206c0 | 1098 | ret = __tcf_idr_release(a, bind, true); |
55334a5d | 1099 | if (ret == ACT_P_DELETED) |
255cd50f | 1100 | module_put(ops->owner); |
55334a5d WC |
1101 | else if (ret < 0) |
1102 | return ret; | |
1da177e4 | 1103 | } |
55334a5d | 1104 | return ret; |
1da177e4 LT |
1105 | } |
1106 | ||
16af6067 VB |
1107 | static int tcf_action_put(struct tc_action *p) |
1108 | { | |
1109 | return __tcf_action_put(p, false); | |
1110 | } | |
1111 | ||
edfaf94f | 1112 | /* Put all actions in this array, skip those NULL's. */ |
90b73b77 | 1113 | static void tcf_action_put_many(struct tc_action *actions[]) |
cae422f3 | 1114 | { |
90b73b77 | 1115 | int i; |
cae422f3 | 1116 | |
edfaf94f | 1117 | for (i = 0; i < TCA_ACT_MAX_PRIO; i++) { |
90b73b77 | 1118 | struct tc_action *a = actions[i]; |
edfaf94f | 1119 | const struct tc_action_ops *ops; |
cae422f3 | 1120 | |
edfaf94f CW |
1121 | if (!a) |
1122 | continue; | |
1123 | ops = a->ops; | |
cae422f3 VB |
1124 | if (tcf_action_put(a)) |
1125 | module_put(ops->owner); | |
1126 | } | |
1127 | } | |
1128 | ||
1da177e4 LT |
1129 | int |
1130 | tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int bind, int ref) | |
1131 | { | |
1da177e4 LT |
1132 | return a->ops->dump(skb, a, bind, ref); |
1133 | } | |
1134 | ||
ca44b738 VB |
1135 | int |
1136 | tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int bind, int ref) | |
1137 | { | |
1138 | int err = -EINVAL; | |
1139 | unsigned char *b = skb_tail_pointer(skb); | |
1140 | struct nlattr *nest; | |
e8cb5bcf | 1141 | u32 flags; |
ca44b738 | 1142 | |
94f44f28 | 1143 | if (tcf_action_dump_terse(skb, a, false)) |
ca44b738 VB |
1144 | goto nla_put_failure; |
1145 | ||
8953b077 JP |
1146 | if (a->hw_stats != TCA_ACT_HW_STATS_ANY && |
1147 | nla_put_bitfield32(skb, TCA_ACT_HW_STATS, | |
1148 | a->hw_stats, TCA_ACT_HW_STATS_ANY)) | |
1149 | goto nla_put_failure; | |
e3822678 | 1150 | |
93a129eb JP |
1151 | if (a->used_hw_stats_valid && |
1152 | nla_put_bitfield32(skb, TCA_ACT_USED_HW_STATS, | |
1153 | a->used_hw_stats, TCA_ACT_HW_STATS_ANY)) | |
1154 | goto nla_put_failure; | |
1155 | ||
e8cb5bcf BZ |
1156 | flags = a->tcfa_flags & TCA_ACT_FLAGS_USER_MASK; |
1157 | if (flags && | |
8953b077 | 1158 | nla_put_bitfield32(skb, TCA_ACT_FLAGS, |
e8cb5bcf | 1159 | flags, flags)) |
8953b077 | 1160 | goto nla_put_failure; |
e3822678 | 1161 | |
7adc5765 BZ |
1162 | if (nla_put_u32(skb, TCA_ACT_IN_HW_COUNT, a->in_hw_count)) |
1163 | goto nla_put_failure; | |
1164 | ||
ae0be8de | 1165 | nest = nla_nest_start_noflag(skb, TCA_OPTIONS); |
4b3550ef PM |
1166 | if (nest == NULL) |
1167 | goto nla_put_failure; | |
cc7ec456 ED |
1168 | err = tcf_action_dump_old(skb, a, bind, ref); |
1169 | if (err > 0) { | |
4b3550ef | 1170 | nla_nest_end(skb, nest); |
1da177e4 LT |
1171 | return err; |
1172 | } | |
1173 | ||
7ba699c6 | 1174 | nla_put_failure: |
dc5fc579 | 1175 | nlmsg_trim(skb, b); |
1da177e4 LT |
1176 | return -1; |
1177 | } | |
62e3ba1b | 1178 | EXPORT_SYMBOL(tcf_action_dump_1); |
1da177e4 | 1179 | |
90b73b77 | 1180 | int tcf_action_dump(struct sk_buff *skb, struct tc_action *actions[], |
ca44b738 | 1181 | int bind, int ref, bool terse) |
1da177e4 LT |
1182 | { |
1183 | struct tc_action *a; | |
90b73b77 | 1184 | int err = -EINVAL, i; |
4b3550ef | 1185 | struct nlattr *nest; |
1da177e4 | 1186 | |
90b73b77 VB |
1187 | for (i = 0; i < TCA_ACT_MAX_PRIO && actions[i]; i++) { |
1188 | a = actions[i]; | |
4097e9d2 | 1189 | nest = nla_nest_start_noflag(skb, i + 1); |
4b3550ef PM |
1190 | if (nest == NULL) |
1191 | goto nla_put_failure; | |
94f44f28 | 1192 | err = terse ? tcf_action_dump_terse(skb, a, false) : |
ca44b738 | 1193 | tcf_action_dump_1(skb, a, bind, ref); |
1da177e4 | 1194 | if (err < 0) |
4fe683f5 | 1195 | goto errout; |
4b3550ef | 1196 | nla_nest_end(skb, nest); |
1da177e4 LT |
1197 | } |
1198 | ||
1199 | return 0; | |
1200 | ||
7ba699c6 | 1201 | nla_put_failure: |
4fe683f5 TG |
1202 | err = -EINVAL; |
1203 | errout: | |
4b3550ef | 1204 | nla_nest_cancel(skb, nest); |
4fe683f5 | 1205 | return err; |
1da177e4 LT |
1206 | } |
1207 | ||
e0535ce5 | 1208 | static struct tc_cookie *nla_memdup_cookie(struct nlattr **tb) |
1045ba77 | 1209 | { |
e0535ce5 WB |
1210 | struct tc_cookie *c = kzalloc(sizeof(*c), GFP_KERNEL); |
1211 | if (!c) | |
1212 | return NULL; | |
1213 | ||
1214 | c->data = nla_memdup(tb[TCA_ACT_COOKIE], GFP_KERNEL); | |
1215 | if (!c->data) { | |
1216 | kfree(c); | |
1217 | return NULL; | |
1045ba77 | 1218 | } |
e0535ce5 | 1219 | c->len = nla_len(tb[TCA_ACT_COOKIE]); |
1045ba77 | 1220 | |
e0535ce5 | 1221 | return c; |
1045ba77 JHS |
1222 | } |
1223 | ||
0dfb2d82 | 1224 | static u8 tcf_action_hw_stats_get(struct nlattr *hw_stats_attr) |
44f86580 | 1225 | { |
0dfb2d82 | 1226 | struct nla_bitfield32 hw_stats_bf; |
44f86580 JP |
1227 | |
1228 | /* If the user did not pass the attr, that means he does | |
1229 | * not care about the type. Return "any" in that case | |
1230 | * which is setting on all supported types. | |
1231 | */ | |
0dfb2d82 JK |
1232 | if (!hw_stats_attr) |
1233 | return TCA_ACT_HW_STATS_ANY; | |
1234 | hw_stats_bf = nla_get_bitfield32(hw_stats_attr); | |
1235 | return hw_stats_bf.value; | |
44f86580 JP |
1236 | } |
1237 | ||
199ce850 | 1238 | static const struct nla_policy tcf_action_policy[TCA_ACT_MAX + 1] = { |
4b793fec | 1239 | [TCA_ACT_KIND] = { .type = NLA_STRING }, |
199ce850 CW |
1240 | [TCA_ACT_INDEX] = { .type = NLA_U32 }, |
1241 | [TCA_ACT_COOKIE] = { .type = NLA_BINARY, | |
1242 | .len = TC_COOKIE_MAX_SIZE }, | |
1243 | [TCA_ACT_OPTIONS] = { .type = NLA_NESTED }, | |
7adc5765 BZ |
1244 | [TCA_ACT_FLAGS] = NLA_POLICY_BITFIELD32(TCA_ACT_FLAGS_NO_PERCPU_STATS | |
1245 | TCA_ACT_FLAGS_SKIP_HW | | |
1246 | TCA_ACT_FLAGS_SKIP_SW), | |
47a1494b | 1247 | [TCA_ACT_HW_STATS] = NLA_POLICY_BITFIELD32(TCA_ACT_HW_STATS_ANY), |
199ce850 CW |
1248 | }; |
1249 | ||
396d7f23 | 1250 | void tcf_idr_insert_many(struct tc_action *actions[]) |
e49d8c22 | 1251 | { |
0fedc63f | 1252 | int i; |
e49d8c22 | 1253 | |
0fedc63f CW |
1254 | for (i = 0; i < TCA_ACT_MAX_PRIO; i++) { |
1255 | struct tc_action *a = actions[i]; | |
1256 | struct tcf_idrinfo *idrinfo; | |
1257 | ||
1258 | if (!a) | |
1259 | continue; | |
1260 | idrinfo = a->idrinfo; | |
1261 | mutex_lock(&idrinfo->lock); | |
1262 | /* Replace ERR_PTR(-EBUSY) allocated by tcf_idr_check_alloc if | |
1263 | * it is just created, otherwise this is just a nop. | |
1264 | */ | |
1265 | idr_replace(&idrinfo->action_idr, a, a->tcfa_index); | |
1266 | mutex_unlock(&idrinfo->lock); | |
1267 | } | |
e49d8c22 CW |
1268 | } |
1269 | ||
695176bf | 1270 | struct tc_action_ops *tc_action_load_ops(struct nlattr *nla, bool police, |
d349f997 CW |
1271 | bool rtnl_held, |
1272 | struct netlink_ext_ack *extack) | |
1da177e4 | 1273 | { |
d349f997 | 1274 | struct nlattr *tb[TCA_ACT_MAX + 1]; |
1da177e4 LT |
1275 | struct tc_action_ops *a_o; |
1276 | char act_name[IFNAMSIZ]; | |
7ba699c6 | 1277 | struct nlattr *kind; |
ab27cfb8 | 1278 | int err; |
1da177e4 | 1279 | |
695176bf | 1280 | if (!police) { |
199ce850 CW |
1281 | err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla, |
1282 | tcf_action_policy, extack); | |
cee63723 | 1283 | if (err < 0) |
d349f997 | 1284 | return ERR_PTR(err); |
cee63723 | 1285 | err = -EINVAL; |
7ba699c6 | 1286 | kind = tb[TCA_ACT_KIND]; |
84ae017a AA |
1287 | if (!kind) { |
1288 | NL_SET_ERR_MSG(extack, "TC action kind must be specified"); | |
d349f997 | 1289 | return ERR_PTR(err); |
84ae017a | 1290 | } |
872f6903 | 1291 | if (nla_strscpy(act_name, kind, IFNAMSIZ) < 0) { |
4b793fec | 1292 | NL_SET_ERR_MSG(extack, "TC action name too long"); |
d349f997 | 1293 | return ERR_PTR(err); |
4b793fec | 1294 | } |
1da177e4 | 1295 | } else { |
695176bf | 1296 | if (strlcpy(act_name, "police", IFNAMSIZ) >= IFNAMSIZ) { |
84ae017a | 1297 | NL_SET_ERR_MSG(extack, "TC action name too long"); |
d349f997 | 1298 | return ERR_PTR(-EINVAL); |
84ae017a | 1299 | } |
1da177e4 LT |
1300 | } |
1301 | ||
1302 | a_o = tc_lookup_action_n(act_name); | |
1303 | if (a_o == NULL) { | |
95a5afca | 1304 | #ifdef CONFIG_MODULES |
789871bb VB |
1305 | if (rtnl_held) |
1306 | rtnl_unlock(); | |
4bba3925 | 1307 | request_module("act_%s", act_name); |
789871bb VB |
1308 | if (rtnl_held) |
1309 | rtnl_lock(); | |
1da177e4 LT |
1310 | |
1311 | a_o = tc_lookup_action_n(act_name); | |
1312 | ||
1313 | /* We dropped the RTNL semaphore in order to | |
1314 | * perform the module load. So, even if we | |
1315 | * succeeded in loading the module we have to | |
1316 | * tell the caller to replay the request. We | |
1317 | * indicate this using -EAGAIN. | |
1318 | */ | |
1319 | if (a_o != NULL) { | |
d349f997 CW |
1320 | module_put(a_o->owner); |
1321 | return ERR_PTR(-EAGAIN); | |
1da177e4 LT |
1322 | } |
1323 | #endif | |
84ae017a | 1324 | NL_SET_ERR_MSG(extack, "Failed to load TC action module"); |
d349f997 | 1325 | return ERR_PTR(-ENOENT); |
1da177e4 LT |
1326 | } |
1327 | ||
d349f997 CW |
1328 | return a_o; |
1329 | } | |
1330 | ||
1331 | struct tc_action *tcf_action_init_1(struct net *net, struct tcf_proto *tp, | |
1332 | struct nlattr *nla, struct nlattr *est, | |
87c750e8 | 1333 | struct tc_action_ops *a_o, int *init_res, |
695176bf | 1334 | u32 flags, struct netlink_ext_ack *extack) |
d349f997 | 1335 | { |
695176bf CW |
1336 | bool police = flags & TCA_ACT_FLAGS_POLICE; |
1337 | struct nla_bitfield32 userflags = { 0, 0 }; | |
d349f997 CW |
1338 | u8 hw_stats = TCA_ACT_HW_STATS_ANY; |
1339 | struct nlattr *tb[TCA_ACT_MAX + 1]; | |
1340 | struct tc_cookie *cookie = NULL; | |
1341 | struct tc_action *a; | |
1342 | int err; | |
1343 | ||
1da177e4 | 1344 | /* backward compatibility for policer */ |
695176bf | 1345 | if (!police) { |
d349f997 CW |
1346 | err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla, |
1347 | tcf_action_policy, extack); | |
1348 | if (err < 0) | |
1349 | return ERR_PTR(err); | |
1350 | if (tb[TCA_ACT_COOKIE]) { | |
1351 | cookie = nla_memdup_cookie(tb); | |
1352 | if (!cookie) { | |
1353 | NL_SET_ERR_MSG(extack, "No memory to generate TC cookie"); | |
1354 | err = -ENOMEM; | |
1355 | goto err_out; | |
1356 | } | |
1357 | } | |
1358 | hw_stats = tcf_action_hw_stats_get(tb[TCA_ACT_HW_STATS]); | |
7adc5765 | 1359 | if (tb[TCA_ACT_FLAGS]) { |
695176bf | 1360 | userflags = nla_get_bitfield32(tb[TCA_ACT_FLAGS]); |
7adc5765 BZ |
1361 | if (!tc_act_flags_valid(userflags.value)) { |
1362 | err = -EINVAL; | |
1363 | goto err_out; | |
1364 | } | |
1365 | } | |
d349f997 | 1366 | |
695176bf CW |
1367 | err = a_o->init(net, tb[TCA_ACT_OPTIONS], est, &a, tp, |
1368 | userflags.value | flags, extack); | |
d349f997 | 1369 | } else { |
695176bf CW |
1370 | err = a_o->init(net, nla, est, &a, tp, userflags.value | flags, |
1371 | extack); | |
d349f997 | 1372 | } |
ab27cfb8 | 1373 | if (err < 0) |
d349f997 | 1374 | goto err_out; |
87c750e8 | 1375 | *init_res = err; |
1da177e4 | 1376 | |
695176bf | 1377 | if (!police && tb[TCA_ACT_COOKIE]) |
eec94fdb | 1378 | tcf_set_action_cookie(&a->act_cookie, cookie); |
1045ba77 | 1379 | |
695176bf | 1380 | if (!police) |
0dfb2d82 | 1381 | a->hw_stats = hw_stats; |
44f86580 | 1382 | |
1da177e4 LT |
1383 | return a; |
1384 | ||
d349f997 | 1385 | err_out: |
e0535ce5 WB |
1386 | if (cookie) { |
1387 | kfree(cookie->data); | |
1388 | kfree(cookie); | |
1389 | } | |
ab27cfb8 | 1390 | return ERR_PTR(err); |
1da177e4 LT |
1391 | } |
1392 | ||
8cbfe939 BZ |
1393 | static bool tc_act_bind(u32 flags) |
1394 | { | |
1395 | return !!(flags & TCA_ACT_FLAGS_BIND); | |
1396 | } | |
1397 | ||
90b73b77 VB |
1398 | /* Returns numbers of initialized actions or negative error. */ |
1399 | ||
9fb9f251 | 1400 | int tcf_action_init(struct net *net, struct tcf_proto *tp, struct nlattr *nla, |
695176bf | 1401 | struct nlattr *est, struct tc_action *actions[], |
c86e0209 BZ |
1402 | int init_res[], size_t *attr_size, |
1403 | u32 flags, u32 fl_flags, | |
695176bf | 1404 | struct netlink_ext_ack *extack) |
1da177e4 | 1405 | { |
d349f997 | 1406 | struct tc_action_ops *ops[TCA_ACT_MAX_PRIO] = {}; |
cc7ec456 | 1407 | struct nlattr *tb[TCA_ACT_MAX_PRIO + 1]; |
33be6271 | 1408 | struct tc_action *act; |
4e76e75d | 1409 | size_t sz = 0; |
cee63723 | 1410 | int err; |
1da177e4 LT |
1411 | int i; |
1412 | ||
8cb08174 JB |
1413 | err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX_PRIO, nla, NULL, |
1414 | extack); | |
cee63723 | 1415 | if (err < 0) |
33be6271 | 1416 | return err; |
1da177e4 | 1417 | |
d349f997 CW |
1418 | for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) { |
1419 | struct tc_action_ops *a_o; | |
1420 | ||
695176bf CW |
1421 | a_o = tc_action_load_ops(tb[i], flags & TCA_ACT_FLAGS_POLICE, |
1422 | !(flags & TCA_ACT_FLAGS_NO_RTNL), | |
1423 | extack); | |
d349f997 CW |
1424 | if (IS_ERR(a_o)) { |
1425 | err = PTR_ERR(a_o); | |
1426 | goto err_mod; | |
1427 | } | |
1428 | ops[i - 1] = a_o; | |
1429 | } | |
1430 | ||
7ba699c6 | 1431 | for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) { |
695176bf CW |
1432 | act = tcf_action_init_1(net, tp, tb[i], est, ops[i - 1], |
1433 | &init_res[i - 1], flags, extack); | |
33be6271 WC |
1434 | if (IS_ERR(act)) { |
1435 | err = PTR_ERR(act); | |
1da177e4 | 1436 | goto err; |
33be6271 | 1437 | } |
4e76e75d | 1438 | sz += tcf_action_fill_size(act); |
90b73b77 VB |
1439 | /* Start from index 0 */ |
1440 | actions[i - 1] = act; | |
c86e0209 BZ |
1441 | if (tc_act_bind(flags)) { |
1442 | bool skip_sw = tc_skip_sw(fl_flags); | |
1443 | bool skip_hw = tc_skip_hw(fl_flags); | |
1444 | ||
1445 | if (tc_act_bind(act->tcfa_flags)) | |
1446 | continue; | |
1447 | if (skip_sw != tc_act_skip_sw(act->tcfa_flags) || | |
1448 | skip_hw != tc_act_skip_hw(act->tcfa_flags)) { | |
1449 | err = -EINVAL; | |
1450 | goto err; | |
1451 | } | |
1452 | } else { | |
7adc5765 BZ |
1453 | err = tcf_action_offload_add(act, extack); |
1454 | if (tc_act_skip_sw(act->tcfa_flags) && err) | |
1455 | goto err; | |
1456 | } | |
1da177e4 | 1457 | } |
aecc5cef | 1458 | |
0fedc63f CW |
1459 | /* We have to commit them all together, because if any error happened in |
1460 | * between, we could not handle the failure gracefully. | |
1461 | */ | |
1462 | tcf_idr_insert_many(actions); | |
1463 | ||
4e76e75d | 1464 | *attr_size = tcf_action_full_attrs_size(sz); |
b3650bf7 VB |
1465 | err = i - 1; |
1466 | goto err_mod; | |
1da177e4 LT |
1467 | |
1468 | err: | |
695176bf | 1469 | tcf_action_destroy(actions, flags & TCA_ACT_FLAGS_BIND); |
d349f997 CW |
1470 | err_mod: |
1471 | for (i = 0; i < TCA_ACT_MAX_PRIO; i++) { | |
1472 | if (ops[i]) | |
1473 | module_put(ops[i]->owner); | |
1474 | } | |
33be6271 | 1475 | return err; |
1da177e4 LT |
1476 | } |
1477 | ||
4b61d3e8 PL |
1478 | void tcf_action_update_stats(struct tc_action *a, u64 bytes, u64 packets, |
1479 | u64 drops, bool hw) | |
c8ecebd0 | 1480 | { |
5e174d5e | 1481 | if (a->cpu_bstats) { |
50dc9a85 | 1482 | _bstats_update(this_cpu_ptr(a->cpu_bstats), bytes, packets); |
c8ecebd0 | 1483 | |
4b61d3e8 | 1484 | this_cpu_ptr(a->cpu_qstats)->drops += drops; |
5e174d5e VB |
1485 | |
1486 | if (hw) | |
50dc9a85 AD |
1487 | _bstats_update(this_cpu_ptr(a->cpu_bstats_hw), |
1488 | bytes, packets); | |
5e174d5e VB |
1489 | return; |
1490 | } | |
c8ecebd0 | 1491 | |
5e174d5e | 1492 | _bstats_update(&a->tcfa_bstats, bytes, packets); |
4b61d3e8 | 1493 | a->tcfa_qstats.drops += drops; |
c8ecebd0 | 1494 | if (hw) |
5e174d5e | 1495 | _bstats_update(&a->tcfa_bstats_hw, bytes, packets); |
c8ecebd0 VB |
1496 | } |
1497 | EXPORT_SYMBOL(tcf_action_update_stats); | |
1498 | ||
ec0595cc | 1499 | int tcf_action_copy_stats(struct sk_buff *skb, struct tc_action *p, |
1da177e4 LT |
1500 | int compat_mode) |
1501 | { | |
1502 | int err = 0; | |
1503 | struct gnet_dump d; | |
10297b99 | 1504 | |
7eb8896d | 1505 | if (p == NULL) |
1da177e4 LT |
1506 | goto errout; |
1507 | ||
c7a66f8d BZ |
1508 | /* update hw stats for this action */ |
1509 | tcf_action_update_hw_stats(p); | |
1510 | ||
1da177e4 | 1511 | /* compat_mode being true specifies a call that is supposed |
06fe9fb4 | 1512 | * to add additional backward compatibility statistic TLVs. |
1da177e4 LT |
1513 | */ |
1514 | if (compat_mode) { | |
ec0595cc | 1515 | if (p->type == TCA_OLD_COMPAT) |
1da177e4 | 1516 | err = gnet_stats_start_copy_compat(skb, 0, |
9854518e ND |
1517 | TCA_STATS, |
1518 | TCA_XSTATS, | |
ec0595cc | 1519 | &p->tcfa_lock, &d, |
9854518e | 1520 | TCA_PAD); |
1da177e4 LT |
1521 | else |
1522 | return 0; | |
1523 | } else | |
1524 | err = gnet_stats_start_copy(skb, TCA_ACT_STATS, | |
ec0595cc | 1525 | &p->tcfa_lock, &d, TCA_ACT_PAD); |
1da177e4 LT |
1526 | |
1527 | if (err < 0) | |
1528 | goto errout; | |
1529 | ||
29cbcd85 AD |
1530 | if (gnet_stats_copy_basic(&d, p->cpu_bstats, |
1531 | &p->tcfa_bstats, false) < 0 || | |
1532 | gnet_stats_copy_basic_hw(&d, p->cpu_bstats_hw, | |
1533 | &p->tcfa_bstats_hw, false) < 0 || | |
1c0d32fd | 1534 | gnet_stats_copy_rate_est(&d, &p->tcfa_rate_est) < 0 || |
519c818e | 1535 | gnet_stats_copy_queue(&d, p->cpu_qstats, |
ec0595cc WC |
1536 | &p->tcfa_qstats, |
1537 | p->tcfa_qstats.qlen) < 0) | |
1da177e4 LT |
1538 | goto errout; |
1539 | ||
1540 | if (gnet_stats_finish_copy(&d) < 0) | |
1541 | goto errout; | |
1542 | ||
1543 | return 0; | |
1544 | ||
1545 | errout: | |
1546 | return -1; | |
1547 | } | |
1548 | ||
90b73b77 | 1549 | static int tca_get_fill(struct sk_buff *skb, struct tc_action *actions[], |
0b0f43fe JHS |
1550 | u32 portid, u32 seq, u16 flags, int event, int bind, |
1551 | int ref) | |
1da177e4 LT |
1552 | { |
1553 | struct tcamsg *t; | |
1554 | struct nlmsghdr *nlh; | |
27a884dc | 1555 | unsigned char *b = skb_tail_pointer(skb); |
4b3550ef | 1556 | struct nlattr *nest; |
1da177e4 | 1557 | |
15e47304 | 1558 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*t), flags); |
8b00a53c DM |
1559 | if (!nlh) |
1560 | goto out_nlmsg_trim; | |
1561 | t = nlmsg_data(nlh); | |
1da177e4 | 1562 | t->tca_family = AF_UNSPEC; |
9ef1d4c7 PM |
1563 | t->tca__pad1 = 0; |
1564 | t->tca__pad2 = 0; | |
10297b99 | 1565 | |
ae0be8de | 1566 | nest = nla_nest_start_noflag(skb, TCA_ACT_TAB); |
1af85155 | 1567 | if (!nest) |
8b00a53c | 1568 | goto out_nlmsg_trim; |
1da177e4 | 1569 | |
ca44b738 | 1570 | if (tcf_action_dump(skb, actions, bind, ref, false) < 0) |
8b00a53c | 1571 | goto out_nlmsg_trim; |
1da177e4 | 1572 | |
4b3550ef | 1573 | nla_nest_end(skb, nest); |
10297b99 | 1574 | |
27a884dc | 1575 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 LT |
1576 | return skb->len; |
1577 | ||
8b00a53c | 1578 | out_nlmsg_trim: |
dc5fc579 | 1579 | nlmsg_trim(skb, b); |
1da177e4 LT |
1580 | return -1; |
1581 | } | |
1582 | ||
1583 | static int | |
c4c4290c | 1584 | tcf_get_notify(struct net *net, u32 portid, struct nlmsghdr *n, |
90b73b77 | 1585 | struct tc_action *actions[], int event, |
84ae017a | 1586 | struct netlink_ext_ack *extack) |
1da177e4 LT |
1587 | { |
1588 | struct sk_buff *skb; | |
1da177e4 LT |
1589 | |
1590 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
1591 | if (!skb) | |
1592 | return -ENOBUFS; | |
0b0f43fe | 1593 | if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, event, |
3f7c72bc | 1594 | 0, 1) <= 0) { |
84ae017a | 1595 | NL_SET_ERR_MSG(extack, "Failed to fill netlink attributes while adding TC action"); |
1da177e4 LT |
1596 | kfree_skb(skb); |
1597 | return -EINVAL; | |
1598 | } | |
2942e900 | 1599 | |
15e47304 | 1600 | return rtnl_unicast(skb, net, portid); |
1da177e4 LT |
1601 | } |
1602 | ||
ddf97ccd | 1603 | static struct tc_action *tcf_action_get_1(struct net *net, struct nlattr *nla, |
84ae017a AA |
1604 | struct nlmsghdr *n, u32 portid, |
1605 | struct netlink_ext_ack *extack) | |
1da177e4 | 1606 | { |
cc7ec456 | 1607 | struct nlattr *tb[TCA_ACT_MAX + 1]; |
a85a970a | 1608 | const struct tc_action_ops *ops; |
1da177e4 LT |
1609 | struct tc_action *a; |
1610 | int index; | |
ab27cfb8 | 1611 | int err; |
1da177e4 | 1612 | |
199ce850 CW |
1613 | err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla, |
1614 | tcf_action_policy, extack); | |
cee63723 | 1615 | if (err < 0) |
ab27cfb8 | 1616 | goto err_out; |
1da177e4 | 1617 | |
cee63723 | 1618 | err = -EINVAL; |
7ba699c6 | 1619 | if (tb[TCA_ACT_INDEX] == NULL || |
84ae017a AA |
1620 | nla_len(tb[TCA_ACT_INDEX]) < sizeof(index)) { |
1621 | NL_SET_ERR_MSG(extack, "Invalid TC action index value"); | |
ab27cfb8 | 1622 | goto err_out; |
84ae017a | 1623 | } |
1587bac4 | 1624 | index = nla_get_u32(tb[TCA_ACT_INDEX]); |
1da177e4 | 1625 | |
ab27cfb8 | 1626 | err = -EINVAL; |
a85a970a | 1627 | ops = tc_lookup_action(tb[TCA_ACT_KIND]); |
84ae017a | 1628 | if (!ops) { /* could happen in batch of actions */ |
f061b48c | 1629 | NL_SET_ERR_MSG(extack, "Specified TC action kind not found"); |
a85a970a | 1630 | goto err_out; |
84ae017a | 1631 | } |
ab27cfb8 | 1632 | err = -ENOENT; |
f061b48c CW |
1633 | if (ops->lookup(net, &a, index) == 0) { |
1634 | NL_SET_ERR_MSG(extack, "TC action with specified index not found"); | |
1da177e4 | 1635 | goto err_mod; |
f061b48c | 1636 | } |
1da177e4 | 1637 | |
a85a970a | 1638 | module_put(ops->owner); |
1da177e4 | 1639 | return a; |
ab27cfb8 | 1640 | |
1da177e4 | 1641 | err_mod: |
a85a970a | 1642 | module_put(ops->owner); |
ab27cfb8 PM |
1643 | err_out: |
1644 | return ERR_PTR(err); | |
1da177e4 LT |
1645 | } |
1646 | ||
7316ae88 | 1647 | static int tca_action_flush(struct net *net, struct nlattr *nla, |
84ae017a AA |
1648 | struct nlmsghdr *n, u32 portid, |
1649 | struct netlink_ext_ack *extack) | |
1da177e4 LT |
1650 | { |
1651 | struct sk_buff *skb; | |
1652 | unsigned char *b; | |
1653 | struct nlmsghdr *nlh; | |
1654 | struct tcamsg *t; | |
1655 | struct netlink_callback dcb; | |
4b3550ef | 1656 | struct nlattr *nest; |
cc7ec456 | 1657 | struct nlattr *tb[TCA_ACT_MAX + 1]; |
a85a970a | 1658 | const struct tc_action_ops *ops; |
7ba699c6 | 1659 | struct nlattr *kind; |
36723873 | 1660 | int err = -ENOMEM; |
1da177e4 | 1661 | |
1da177e4 | 1662 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
84ae017a | 1663 | if (!skb) |
36723873 | 1664 | return err; |
1da177e4 | 1665 | |
27a884dc | 1666 | b = skb_tail_pointer(skb); |
1da177e4 | 1667 | |
199ce850 CW |
1668 | err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla, |
1669 | tcf_action_policy, extack); | |
cee63723 | 1670 | if (err < 0) |
1da177e4 LT |
1671 | goto err_out; |
1672 | ||
cee63723 | 1673 | err = -EINVAL; |
7ba699c6 | 1674 | kind = tb[TCA_ACT_KIND]; |
a85a970a | 1675 | ops = tc_lookup_action(kind); |
84ae017a AA |
1676 | if (!ops) { /*some idjot trying to flush unknown action */ |
1677 | NL_SET_ERR_MSG(extack, "Cannot flush unknown TC action"); | |
1da177e4 | 1678 | goto err_out; |
84ae017a | 1679 | } |
1da177e4 | 1680 | |
0b0f43fe JHS |
1681 | nlh = nlmsg_put(skb, portid, n->nlmsg_seq, RTM_DELACTION, |
1682 | sizeof(*t), 0); | |
84ae017a AA |
1683 | if (!nlh) { |
1684 | NL_SET_ERR_MSG(extack, "Failed to create TC action flush notification"); | |
8b00a53c | 1685 | goto out_module_put; |
84ae017a | 1686 | } |
8b00a53c | 1687 | t = nlmsg_data(nlh); |
1da177e4 | 1688 | t->tca_family = AF_UNSPEC; |
9ef1d4c7 PM |
1689 | t->tca__pad1 = 0; |
1690 | t->tca__pad2 = 0; | |
1da177e4 | 1691 | |
ae0be8de | 1692 | nest = nla_nest_start_noflag(skb, TCA_ACT_TAB); |
84ae017a AA |
1693 | if (!nest) { |
1694 | NL_SET_ERR_MSG(extack, "Failed to add new netlink message"); | |
8b00a53c | 1695 | goto out_module_put; |
84ae017a | 1696 | } |
1da177e4 | 1697 | |
41780105 | 1698 | err = ops->walk(net, skb, &dcb, RTM_DELACTION, ops, extack); |
66dede2d DC |
1699 | if (err <= 0) { |
1700 | nla_nest_cancel(skb, nest); | |
8b00a53c | 1701 | goto out_module_put; |
66dede2d | 1702 | } |
1da177e4 | 1703 | |
4b3550ef | 1704 | nla_nest_end(skb, nest); |
1da177e4 | 1705 | |
27a884dc | 1706 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 | 1707 | nlh->nlmsg_flags |= NLM_F_ROOT; |
a85a970a | 1708 | module_put(ops->owner); |
15e47304 | 1709 | err = rtnetlink_send(skb, net, portid, RTNLGRP_TC, |
cc7ec456 | 1710 | n->nlmsg_flags & NLM_F_ECHO); |
84ae017a AA |
1711 | if (err < 0) |
1712 | NL_SET_ERR_MSG(extack, "Failed to send TC action flush notification"); | |
1da177e4 LT |
1713 | |
1714 | return err; | |
1715 | ||
8b00a53c | 1716 | out_module_put: |
a85a970a | 1717 | module_put(ops->owner); |
1da177e4 LT |
1718 | err_out: |
1719 | kfree_skb(skb); | |
1da177e4 LT |
1720 | return err; |
1721 | } | |
1722 | ||
b144e7ec | 1723 | static int tcf_action_delete(struct net *net, struct tc_action *actions[]) |
16af6067 | 1724 | { |
97a3f84f | 1725 | int i; |
16af6067 | 1726 | |
90b73b77 VB |
1727 | for (i = 0; i < TCA_ACT_MAX_PRIO && actions[i]; i++) { |
1728 | struct tc_action *a = actions[i]; | |
16af6067 | 1729 | const struct tc_action_ops *ops = a->ops; |
16af6067 VB |
1730 | /* Actions can be deleted concurrently so we must save their |
1731 | * type and id to search again after reference is released. | |
1732 | */ | |
97a3f84f CW |
1733 | struct tcf_idrinfo *idrinfo = a->idrinfo; |
1734 | u32 act_index = a->tcfa_index; | |
16af6067 | 1735 | |
c10bbfae | 1736 | actions[i] = NULL; |
16af6067 VB |
1737 | if (tcf_action_put(a)) { |
1738 | /* last reference, action was deleted concurrently */ | |
1739 | module_put(ops->owner); | |
1740 | } else { | |
97a3f84f CW |
1741 | int ret; |
1742 | ||
16af6067 | 1743 | /* now do the delete */ |
97a3f84f | 1744 | ret = tcf_idr_delete_index(idrinfo, act_index); |
edfaf94f | 1745 | if (ret < 0) |
16af6067 VB |
1746 | return ret; |
1747 | } | |
1748 | } | |
1749 | return 0; | |
1750 | } | |
1751 | ||
13926d19 BZ |
1752 | static int |
1753 | tcf_reoffload_del_notify(struct net *net, struct tc_action *action) | |
1754 | { | |
1755 | size_t attr_size = tcf_action_fill_size(action); | |
1756 | struct tc_action *actions[TCA_ACT_MAX_PRIO] = { | |
1757 | [0] = action, | |
1758 | }; | |
1759 | const struct tc_action_ops *ops = action->ops; | |
1760 | struct sk_buff *skb; | |
1761 | int ret; | |
1762 | ||
1763 | skb = alloc_skb(attr_size <= NLMSG_GOODSIZE ? NLMSG_GOODSIZE : attr_size, | |
1764 | GFP_KERNEL); | |
1765 | if (!skb) | |
1766 | return -ENOBUFS; | |
1767 | ||
1768 | if (tca_get_fill(skb, actions, 0, 0, 0, RTM_DELACTION, 0, 1) <= 0) { | |
1769 | kfree_skb(skb); | |
1770 | return -EINVAL; | |
1771 | } | |
1772 | ||
1773 | ret = tcf_idr_release_unsafe(action); | |
1774 | if (ret == ACT_P_DELETED) { | |
1775 | module_put(ops->owner); | |
1776 | ret = rtnetlink_send(skb, net, 0, RTNLGRP_TC, 0); | |
1777 | } else { | |
1778 | kfree_skb(skb); | |
1779 | } | |
1780 | ||
1781 | return ret; | |
1782 | } | |
1783 | ||
1784 | int tcf_action_reoffload_cb(flow_indr_block_bind_cb_t *cb, | |
1785 | void *cb_priv, bool add) | |
1786 | { | |
1787 | struct tc_act_pernet_id *id_ptr; | |
1788 | struct tcf_idrinfo *idrinfo; | |
1789 | struct tc_action_net *tn; | |
1790 | struct tc_action *p; | |
1791 | unsigned int act_id; | |
1792 | unsigned long tmp; | |
1793 | unsigned long id; | |
1794 | struct idr *idr; | |
1795 | struct net *net; | |
1796 | int ret; | |
1797 | ||
1798 | if (!cb) | |
1799 | return -EINVAL; | |
1800 | ||
1801 | down_read(&net_rwsem); | |
1802 | mutex_lock(&act_id_mutex); | |
1803 | ||
1804 | for_each_net(net) { | |
1805 | list_for_each_entry(id_ptr, &act_pernet_id_list, list) { | |
1806 | act_id = id_ptr->id; | |
1807 | tn = net_generic(net, act_id); | |
1808 | if (!tn) | |
1809 | continue; | |
1810 | idrinfo = tn->idrinfo; | |
1811 | if (!idrinfo) | |
1812 | continue; | |
1813 | ||
1814 | mutex_lock(&idrinfo->lock); | |
1815 | idr = &idrinfo->action_idr; | |
1816 | idr_for_each_entry_ul(idr, p, tmp, id) { | |
1817 | if (IS_ERR(p) || tc_act_bind(p->tcfa_flags)) | |
1818 | continue; | |
1819 | if (add) { | |
1820 | tcf_action_offload_add_ex(p, NULL, cb, | |
1821 | cb_priv); | |
1822 | continue; | |
1823 | } | |
1824 | ||
1825 | /* cb unregister to update hw count */ | |
1826 | ret = tcf_action_offload_del_ex(p, cb, cb_priv); | |
1827 | if (ret < 0) | |
1828 | continue; | |
1829 | if (tc_act_skip_sw(p->tcfa_flags) && | |
1830 | !tc_act_in_hw(p)) | |
1831 | tcf_reoffload_del_notify(net, p); | |
1832 | } | |
1833 | mutex_unlock(&idrinfo->lock); | |
1834 | } | |
1835 | } | |
1836 | mutex_unlock(&act_id_mutex); | |
1837 | up_read(&net_rwsem); | |
1838 | ||
1839 | return 0; | |
1840 | } | |
1841 | ||
a56e1953 | 1842 | static int |
90b73b77 | 1843 | tcf_del_notify(struct net *net, struct nlmsghdr *n, struct tc_action *actions[], |
edfaf94f | 1844 | u32 portid, size_t attr_size, struct netlink_ext_ack *extack) |
a56e1953 WC |
1845 | { |
1846 | int ret; | |
1847 | struct sk_buff *skb; | |
1848 | ||
d04e6990 RM |
1849 | skb = alloc_skb(attr_size <= NLMSG_GOODSIZE ? NLMSG_GOODSIZE : attr_size, |
1850 | GFP_KERNEL); | |
a56e1953 WC |
1851 | if (!skb) |
1852 | return -ENOBUFS; | |
1853 | ||
1854 | if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, RTM_DELACTION, | |
3f7c72bc | 1855 | 0, 2) <= 0) { |
84ae017a | 1856 | NL_SET_ERR_MSG(extack, "Failed to fill netlink TC action attributes"); |
a56e1953 WC |
1857 | kfree_skb(skb); |
1858 | return -EINVAL; | |
1859 | } | |
1860 | ||
1861 | /* now do the delete */ | |
b144e7ec | 1862 | ret = tcf_action_delete(net, actions); |
55334a5d | 1863 | if (ret < 0) { |
84ae017a | 1864 | NL_SET_ERR_MSG(extack, "Failed to delete TC action"); |
55334a5d WC |
1865 | kfree_skb(skb); |
1866 | return ret; | |
1867 | } | |
a56e1953 WC |
1868 | |
1869 | ret = rtnetlink_send(skb, net, portid, RTNLGRP_TC, | |
1870 | n->nlmsg_flags & NLM_F_ECHO); | |
a56e1953 WC |
1871 | return ret; |
1872 | } | |
1873 | ||
1da177e4 | 1874 | static int |
7316ae88 | 1875 | tca_action_gd(struct net *net, struct nlattr *nla, struct nlmsghdr *n, |
84ae017a | 1876 | u32 portid, int event, struct netlink_ext_ack *extack) |
1da177e4 | 1877 | { |
cee63723 | 1878 | int i, ret; |
cc7ec456 | 1879 | struct nlattr *tb[TCA_ACT_MAX_PRIO + 1]; |
33be6271 | 1880 | struct tc_action *act; |
d04e6990 | 1881 | size_t attr_size = 0; |
edfaf94f | 1882 | struct tc_action *actions[TCA_ACT_MAX_PRIO] = {}; |
1da177e4 | 1883 | |
8cb08174 JB |
1884 | ret = nla_parse_nested_deprecated(tb, TCA_ACT_MAX_PRIO, nla, NULL, |
1885 | extack); | |
cee63723 PM |
1886 | if (ret < 0) |
1887 | return ret; | |
1da177e4 | 1888 | |
cc7ec456 | 1889 | if (event == RTM_DELACTION && n->nlmsg_flags & NLM_F_ROOT) { |
1af85155 | 1890 | if (tb[1]) |
84ae017a | 1891 | return tca_action_flush(net, tb[1], n, portid, extack); |
1af85155 | 1892 | |
84ae017a | 1893 | NL_SET_ERR_MSG(extack, "Invalid netlink attributes while flushing TC action"); |
1af85155 | 1894 | return -EINVAL; |
1da177e4 LT |
1895 | } |
1896 | ||
7ba699c6 | 1897 | for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) { |
84ae017a | 1898 | act = tcf_action_get_1(net, tb[i], n, portid, extack); |
ab27cfb8 PM |
1899 | if (IS_ERR(act)) { |
1900 | ret = PTR_ERR(act); | |
1da177e4 | 1901 | goto err; |
ab27cfb8 | 1902 | } |
4e76e75d | 1903 | attr_size += tcf_action_fill_size(act); |
90b73b77 | 1904 | actions[i - 1] = act; |
1da177e4 | 1905 | } |
4e76e75d RM |
1906 | |
1907 | attr_size = tcf_action_full_attrs_size(attr_size); | |
1da177e4 LT |
1908 | |
1909 | if (event == RTM_GETACTION) | |
90b73b77 | 1910 | ret = tcf_get_notify(net, portid, n, actions, event, extack); |
1da177e4 | 1911 | else { /* delete */ |
edfaf94f | 1912 | ret = tcf_del_notify(net, n, actions, portid, attr_size, extack); |
a56e1953 | 1913 | if (ret) |
1da177e4 | 1914 | goto err; |
edfaf94f | 1915 | return 0; |
1da177e4 LT |
1916 | } |
1917 | err: | |
edfaf94f | 1918 | tcf_action_put_many(actions); |
1da177e4 LT |
1919 | return ret; |
1920 | } | |
1921 | ||
a56e1953 | 1922 | static int |
90b73b77 | 1923 | tcf_add_notify(struct net *net, struct nlmsghdr *n, struct tc_action *actions[], |
d04e6990 | 1924 | u32 portid, size_t attr_size, struct netlink_ext_ack *extack) |
1da177e4 | 1925 | { |
1da177e4 | 1926 | struct sk_buff *skb; |
1da177e4 | 1927 | |
d04e6990 RM |
1928 | skb = alloc_skb(attr_size <= NLMSG_GOODSIZE ? NLMSG_GOODSIZE : attr_size, |
1929 | GFP_KERNEL); | |
1da177e4 LT |
1930 | if (!skb) |
1931 | return -ENOBUFS; | |
1932 | ||
a56e1953 WC |
1933 | if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, n->nlmsg_flags, |
1934 | RTM_NEWACTION, 0, 0) <= 0) { | |
d143b9e3 | 1935 | NL_SET_ERR_MSG(extack, "Failed to fill netlink attributes while adding TC action"); |
a56e1953 WC |
1936 | kfree_skb(skb); |
1937 | return -EINVAL; | |
1938 | } | |
10297b99 | 1939 | |
f79a3bcb YD |
1940 | return rtnetlink_send(skb, net, portid, RTNLGRP_TC, |
1941 | n->nlmsg_flags & NLM_F_ECHO); | |
1da177e4 LT |
1942 | } |
1943 | ||
5a7a5555 | 1944 | static int tcf_action_add(struct net *net, struct nlattr *nla, |
695176bf | 1945 | struct nlmsghdr *n, u32 portid, u32 flags, |
aea0d727 | 1946 | struct netlink_ext_ack *extack) |
1da177e4 | 1947 | { |
d04e6990 | 1948 | size_t attr_size = 0; |
87c750e8 | 1949 | int loop, ret, i; |
90b73b77 | 1950 | struct tc_action *actions[TCA_ACT_MAX_PRIO] = {}; |
87c750e8 | 1951 | int init_res[TCA_ACT_MAX_PRIO] = {}; |
1da177e4 | 1952 | |
39f13ea2 | 1953 | for (loop = 0; loop < 10; loop++) { |
695176bf | 1954 | ret = tcf_action_init(net, NULL, nla, NULL, actions, init_res, |
c86e0209 | 1955 | &attr_size, flags, 0, extack); |
39f13ea2 ED |
1956 | if (ret != -EAGAIN) |
1957 | break; | |
1958 | } | |
1959 | ||
90b73b77 | 1960 | if (ret < 0) |
f07fed82 | 1961 | return ret; |
90b73b77 | 1962 | ret = tcf_add_notify(net, n, actions, portid, attr_size, extack); |
87c750e8 VB |
1963 | |
1964 | /* only put existing actions */ | |
1965 | for (i = 0; i < TCA_ACT_MAX_PRIO; i++) | |
1966 | if (init_res[i] == ACT_P_CREATED) | |
1967 | actions[i] = NULL; | |
1968 | tcf_action_put_many(actions); | |
1da177e4 | 1969 | |
cae422f3 | 1970 | return ret; |
1da177e4 LT |
1971 | } |
1972 | ||
90825b23 | 1973 | static const struct nla_policy tcaa_policy[TCA_ROOT_MAX + 1] = { |
f460019b VB |
1974 | [TCA_ROOT_FLAGS] = NLA_POLICY_BITFIELD32(TCA_ACT_FLAG_LARGE_DUMP_ON | |
1975 | TCA_ACT_FLAG_TERSE_DUMP), | |
e62e484d | 1976 | [TCA_ROOT_TIME_DELTA] = { .type = NLA_U32 }, |
90825b23 JHS |
1977 | }; |
1978 | ||
c21ef3e3 DA |
1979 | static int tc_ctl_action(struct sk_buff *skb, struct nlmsghdr *n, |
1980 | struct netlink_ext_ack *extack) | |
1da177e4 | 1981 | { |
3b1e0a65 | 1982 | struct net *net = sock_net(skb->sk); |
90825b23 | 1983 | struct nlattr *tca[TCA_ROOT_MAX + 1]; |
8bf15395 | 1984 | u32 portid = NETLINK_CB(skb).portid; |
695176bf CW |
1985 | u32 flags = 0; |
1986 | int ret = 0; | |
1da177e4 | 1987 | |
0b0f43fe JHS |
1988 | if ((n->nlmsg_type != RTM_GETACTION) && |
1989 | !netlink_capable(skb, CAP_NET_ADMIN)) | |
dfc47ef8 EB |
1990 | return -EPERM; |
1991 | ||
8cb08174 JB |
1992 | ret = nlmsg_parse_deprecated(n, sizeof(struct tcamsg), tca, |
1993 | TCA_ROOT_MAX, NULL, extack); | |
7ba699c6 PM |
1994 | if (ret < 0) |
1995 | return ret; | |
1996 | ||
1997 | if (tca[TCA_ACT_TAB] == NULL) { | |
84ae017a | 1998 | NL_SET_ERR_MSG(extack, "Netlink action attributes missing"); |
1da177e4 LT |
1999 | return -EINVAL; |
2000 | } | |
2001 | ||
cc7ec456 | 2002 | /* n->nlmsg_flags & NLM_F_CREATE */ |
1da177e4 LT |
2003 | switch (n->nlmsg_type) { |
2004 | case RTM_NEWACTION: | |
2005 | /* we are going to assume all other flags | |
25985edc | 2006 | * imply create only if it doesn't exist |
1da177e4 LT |
2007 | * Note that CREATE | EXCL implies that |
2008 | * but since we want avoid ambiguity (eg when flags | |
2009 | * is zero) then just set this | |
2010 | */ | |
cc7ec456 | 2011 | if (n->nlmsg_flags & NLM_F_REPLACE) |
695176bf CW |
2012 | flags = TCA_ACT_FLAGS_REPLACE; |
2013 | ret = tcf_action_add(net, tca[TCA_ACT_TAB], n, portid, flags, | |
aea0d727 | 2014 | extack); |
1da177e4 LT |
2015 | break; |
2016 | case RTM_DELACTION: | |
7316ae88 | 2017 | ret = tca_action_gd(net, tca[TCA_ACT_TAB], n, |
84ae017a | 2018 | portid, RTM_DELACTION, extack); |
1da177e4 LT |
2019 | break; |
2020 | case RTM_GETACTION: | |
7316ae88 | 2021 | ret = tca_action_gd(net, tca[TCA_ACT_TAB], n, |
84ae017a | 2022 | portid, RTM_GETACTION, extack); |
1da177e4 LT |
2023 | break; |
2024 | default: | |
2025 | BUG(); | |
2026 | } | |
2027 | ||
2028 | return ret; | |
2029 | } | |
2030 | ||
90825b23 | 2031 | static struct nlattr *find_dump_kind(struct nlattr **nla) |
1da177e4 | 2032 | { |
cc7ec456 | 2033 | struct nlattr *tb1, *tb2[TCA_ACT_MAX + 1]; |
7ba699c6 | 2034 | struct nlattr *tb[TCA_ACT_MAX_PRIO + 1]; |
7ba699c6 | 2035 | struct nlattr *kind; |
1da177e4 | 2036 | |
7ba699c6 | 2037 | tb1 = nla[TCA_ACT_TAB]; |
1da177e4 LT |
2038 | if (tb1 == NULL) |
2039 | return NULL; | |
2040 | ||
8cb08174 | 2041 | if (nla_parse_deprecated(tb, TCA_ACT_MAX_PRIO, nla_data(tb1), NLMSG_ALIGN(nla_len(tb1)), NULL, NULL) < 0) |
1da177e4 | 2042 | return NULL; |
1da177e4 | 2043 | |
6d834e04 PM |
2044 | if (tb[1] == NULL) |
2045 | return NULL; | |
199ce850 | 2046 | if (nla_parse_nested_deprecated(tb2, TCA_ACT_MAX, tb[1], tcf_action_policy, NULL) < 0) |
1da177e4 | 2047 | return NULL; |
7ba699c6 | 2048 | kind = tb2[TCA_ACT_KIND]; |
1da177e4 | 2049 | |
26dab893 | 2050 | return kind; |
1da177e4 LT |
2051 | } |
2052 | ||
5a7a5555 | 2053 | static int tc_dump_action(struct sk_buff *skb, struct netlink_callback *cb) |
1da177e4 | 2054 | { |
ddf97ccd | 2055 | struct net *net = sock_net(skb->sk); |
1da177e4 | 2056 | struct nlmsghdr *nlh; |
27a884dc | 2057 | unsigned char *b = skb_tail_pointer(skb); |
4b3550ef | 2058 | struct nlattr *nest; |
1da177e4 | 2059 | struct tc_action_ops *a_o; |
1da177e4 | 2060 | int ret = 0; |
8b00a53c | 2061 | struct tcamsg *t = (struct tcamsg *) nlmsg_data(cb->nlh); |
90825b23 JHS |
2062 | struct nlattr *tb[TCA_ROOT_MAX + 1]; |
2063 | struct nlattr *count_attr = NULL; | |
e62e484d | 2064 | unsigned long jiffy_since = 0; |
90825b23 JHS |
2065 | struct nlattr *kind = NULL; |
2066 | struct nla_bitfield32 bf; | |
e62e484d | 2067 | u32 msecs_since = 0; |
90825b23 JHS |
2068 | u32 act_count = 0; |
2069 | ||
8cb08174 JB |
2070 | ret = nlmsg_parse_deprecated(cb->nlh, sizeof(struct tcamsg), tb, |
2071 | TCA_ROOT_MAX, tcaa_policy, cb->extack); | |
90825b23 JHS |
2072 | if (ret < 0) |
2073 | return ret; | |
1da177e4 | 2074 | |
90825b23 | 2075 | kind = find_dump_kind(tb); |
1da177e4 | 2076 | if (kind == NULL) { |
6ff9c364 | 2077 | pr_info("tc_dump_action: action bad kind\n"); |
1da177e4 LT |
2078 | return 0; |
2079 | } | |
2080 | ||
26dab893 | 2081 | a_o = tc_lookup_action(kind); |
cc7ec456 | 2082 | if (a_o == NULL) |
1da177e4 | 2083 | return 0; |
1da177e4 | 2084 | |
90825b23 JHS |
2085 | cb->args[2] = 0; |
2086 | if (tb[TCA_ROOT_FLAGS]) { | |
2087 | bf = nla_get_bitfield32(tb[TCA_ROOT_FLAGS]); | |
2088 | cb->args[2] = bf.value; | |
2089 | } | |
2090 | ||
e62e484d JHS |
2091 | if (tb[TCA_ROOT_TIME_DELTA]) { |
2092 | msecs_since = nla_get_u32(tb[TCA_ROOT_TIME_DELTA]); | |
2093 | } | |
2094 | ||
15e47304 | 2095 | nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, |
8b00a53c DM |
2096 | cb->nlh->nlmsg_type, sizeof(*t), 0); |
2097 | if (!nlh) | |
2098 | goto out_module_put; | |
90825b23 | 2099 | |
e62e484d JHS |
2100 | if (msecs_since) |
2101 | jiffy_since = jiffies - msecs_to_jiffies(msecs_since); | |
2102 | ||
8b00a53c | 2103 | t = nlmsg_data(nlh); |
1da177e4 | 2104 | t->tca_family = AF_UNSPEC; |
9ef1d4c7 PM |
2105 | t->tca__pad1 = 0; |
2106 | t->tca__pad2 = 0; | |
e62e484d | 2107 | cb->args[3] = jiffy_since; |
90825b23 JHS |
2108 | count_attr = nla_reserve(skb, TCA_ROOT_COUNT, sizeof(u32)); |
2109 | if (!count_attr) | |
2110 | goto out_module_put; | |
1da177e4 | 2111 | |
ae0be8de | 2112 | nest = nla_nest_start_noflag(skb, TCA_ACT_TAB); |
4b3550ef | 2113 | if (nest == NULL) |
8b00a53c | 2114 | goto out_module_put; |
1da177e4 | 2115 | |
41780105 | 2116 | ret = a_o->walk(net, skb, cb, RTM_GETACTION, a_o, NULL); |
1da177e4 | 2117 | if (ret < 0) |
8b00a53c | 2118 | goto out_module_put; |
1da177e4 LT |
2119 | |
2120 | if (ret > 0) { | |
4b3550ef | 2121 | nla_nest_end(skb, nest); |
1da177e4 | 2122 | ret = skb->len; |
90825b23 JHS |
2123 | act_count = cb->args[1]; |
2124 | memcpy(nla_data(count_attr), &act_count, sizeof(u32)); | |
2125 | cb->args[1] = 0; | |
1da177e4 | 2126 | } else |
ebecaa66 | 2127 | nlmsg_trim(skb, b); |
1da177e4 | 2128 | |
27a884dc | 2129 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
15e47304 | 2130 | if (NETLINK_CB(cb->skb).portid && ret) |
1da177e4 LT |
2131 | nlh->nlmsg_flags |= NLM_F_MULTI; |
2132 | module_put(a_o->owner); | |
2133 | return skb->len; | |
2134 | ||
8b00a53c | 2135 | out_module_put: |
1da177e4 | 2136 | module_put(a_o->owner); |
dc5fc579 | 2137 | nlmsg_trim(skb, b); |
1da177e4 LT |
2138 | return skb->len; |
2139 | } | |
2140 | ||
2141 | static int __init tc_action_init(void) | |
2142 | { | |
b97bac64 FW |
2143 | rtnl_register(PF_UNSPEC, RTM_NEWACTION, tc_ctl_action, NULL, 0); |
2144 | rtnl_register(PF_UNSPEC, RTM_DELACTION, tc_ctl_action, NULL, 0); | |
c7ac8679 | 2145 | rtnl_register(PF_UNSPEC, RTM_GETACTION, tc_ctl_action, tc_dump_action, |
b97bac64 | 2146 | 0); |
1da177e4 | 2147 | |
1da177e4 LT |
2148 | return 0; |
2149 | } | |
2150 | ||
2151 | subsys_initcall(tc_action_init); |