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> |
871cf386 | 26 | #include <net/tc_wrapper.h> |
1da177e4 | 27 | |
c129412f | 28 | #ifdef CONFIG_INET |
29 | DEFINE_STATIC_KEY_FALSE(tcf_frag_xmit_count); | |
30 | EXPORT_SYMBOL_GPL(tcf_frag_xmit_count); | |
31 | #endif | |
32 | ||
33 | int tcf_dev_queue_xmit(struct sk_buff *skb, int (*xmit)(struct sk_buff *skb)) | |
34 | { | |
35 | #ifdef CONFIG_INET | |
36 | if (static_branch_unlikely(&tcf_frag_xmit_count)) | |
37 | return sch_frag_xmit_hook(skb, xmit); | |
38 | #endif | |
39 | ||
40 | return xmit(skb); | |
41 | } | |
42 | EXPORT_SYMBOL_GPL(tcf_dev_queue_xmit); | |
43 | ||
db50514f JP |
44 | static void tcf_action_goto_chain_exec(const struct tc_action *a, |
45 | struct tcf_result *res) | |
46 | { | |
ee3bbfe8 | 47 | const struct tcf_chain *chain = rcu_dereference_bh(a->goto_chain); |
db50514f JP |
48 | |
49 | res->goto_tp = rcu_dereference_bh(chain->filter_chain); | |
50 | } | |
51 | ||
eec94fdb VB |
52 | static void tcf_free_cookie_rcu(struct rcu_head *p) |
53 | { | |
54 | struct tc_cookie *cookie = container_of(p, struct tc_cookie, rcu); | |
55 | ||
56 | kfree(cookie->data); | |
57 | kfree(cookie); | |
58 | } | |
59 | ||
60 | static void tcf_set_action_cookie(struct tc_cookie __rcu **old_cookie, | |
61 | struct tc_cookie *new_cookie) | |
62 | { | |
63 | struct tc_cookie *old; | |
64 | ||
0dbc81ea | 65 | old = xchg((__force struct tc_cookie **)old_cookie, new_cookie); |
eec94fdb VB |
66 | if (old) |
67 | call_rcu(&old->rcu, tcf_free_cookie_rcu); | |
68 | } | |
69 | ||
85d0966f DC |
70 | int tcf_action_check_ctrlact(int action, struct tcf_proto *tp, |
71 | struct tcf_chain **newchain, | |
72 | struct netlink_ext_ack *extack) | |
73 | { | |
74 | int opcode = TC_ACT_EXT_OPCODE(action), ret = -EINVAL; | |
75 | u32 chain_index; | |
76 | ||
77 | if (!opcode) | |
78 | ret = action > TC_ACT_VALUE_MAX ? -EINVAL : 0; | |
79 | else if (opcode <= TC_ACT_EXT_OPCODE_MAX || action == TC_ACT_UNSPEC) | |
80 | ret = 0; | |
81 | if (ret) { | |
82 | NL_SET_ERR_MSG(extack, "invalid control action"); | |
83 | goto end; | |
84 | } | |
85 | ||
86 | if (TC_ACT_EXT_CMP(action, TC_ACT_GOTO_CHAIN)) { | |
87 | chain_index = action & TC_ACT_EXT_VAL_MASK; | |
88 | if (!tp || !newchain) { | |
89 | ret = -EINVAL; | |
90 | NL_SET_ERR_MSG(extack, | |
91 | "can't goto NULL proto/chain"); | |
92 | goto end; | |
93 | } | |
94 | *newchain = tcf_chain_get_by_act(tp->chain->block, chain_index); | |
95 | if (!*newchain) { | |
96 | ret = -ENOMEM; | |
97 | NL_SET_ERR_MSG(extack, | |
98 | "can't allocate goto_chain"); | |
99 | } | |
100 | } | |
101 | end: | |
102 | return ret; | |
103 | } | |
104 | EXPORT_SYMBOL(tcf_action_check_ctrlact); | |
105 | ||
106 | struct tcf_chain *tcf_action_set_ctrlact(struct tc_action *a, int action, | |
ee3bbfe8 | 107 | struct tcf_chain *goto_chain) |
85d0966f | 108 | { |
85d0966f | 109 | a->tcfa_action = action; |
445d3749 | 110 | goto_chain = rcu_replace_pointer(a->goto_chain, goto_chain, 1); |
ee3bbfe8 | 111 | return goto_chain; |
85d0966f DC |
112 | } |
113 | EXPORT_SYMBOL(tcf_action_set_ctrlact); | |
114 | ||
d7fb60b9 CW |
115 | /* XXX: For standalone actions, we don't need a RCU grace period either, because |
116 | * actions are always connected to filters and filters are already destroyed in | |
117 | * RCU callbacks, so after a RCU grace period actions are already disconnected | |
118 | * from filters. Readers later can not find us. | |
119 | */ | |
120 | static void free_tcf(struct tc_action *p) | |
519c818e | 121 | { |
ee3bbfe8 | 122 | struct tcf_chain *chain = rcu_dereference_protected(p->goto_chain, 1); |
85d0966f | 123 | |
519c818e | 124 | free_percpu(p->cpu_bstats); |
28169aba | 125 | free_percpu(p->cpu_bstats_hw); |
519c818e | 126 | free_percpu(p->cpu_qstats); |
1045ba77 | 127 | |
db4b4902 | 128 | tcf_set_action_cookie(&p->user_cookie, NULL); |
85d0966f DC |
129 | if (chain) |
130 | tcf_chain_put_by_act(chain); | |
1045ba77 | 131 | |
519c818e ED |
132 | kfree(p); |
133 | } | |
134 | ||
7adc5765 BZ |
135 | static void offload_action_hw_count_set(struct tc_action *act, |
136 | u32 hw_count) | |
137 | { | |
138 | act->in_hw_count = hw_count; | |
139 | } | |
140 | ||
13926d19 BZ |
141 | static void offload_action_hw_count_inc(struct tc_action *act, |
142 | u32 hw_count) | |
143 | { | |
144 | act->in_hw_count += hw_count; | |
145 | } | |
146 | ||
147 | static void offload_action_hw_count_dec(struct tc_action *act, | |
148 | u32 hw_count) | |
149 | { | |
150 | act->in_hw_count = act->in_hw_count > hw_count ? | |
151 | act->in_hw_count - hw_count : 0; | |
152 | } | |
153 | ||
8cbfe939 BZ |
154 | static unsigned int tcf_offload_act_num_actions_single(struct tc_action *act) |
155 | { | |
156 | if (is_tcf_pedit(act)) | |
157 | return tcf_pedit_nkeys(act); | |
158 | else | |
159 | return 1; | |
160 | } | |
161 | ||
7adc5765 BZ |
162 | static bool tc_act_skip_hw(u32 flags) |
163 | { | |
164 | return (flags & TCA_ACT_FLAGS_SKIP_HW) ? true : false; | |
165 | } | |
166 | ||
167 | static bool tc_act_skip_sw(u32 flags) | |
168 | { | |
169 | return (flags & TCA_ACT_FLAGS_SKIP_SW) ? true : false; | |
170 | } | |
171 | ||
7adc5765 BZ |
172 | /* SKIP_HW and SKIP_SW are mutually exclusive flags. */ |
173 | static bool tc_act_flags_valid(u32 flags) | |
174 | { | |
175 | flags &= TCA_ACT_FLAGS_SKIP_HW | TCA_ACT_FLAGS_SKIP_SW; | |
176 | ||
177 | return flags ^ (TCA_ACT_FLAGS_SKIP_HW | TCA_ACT_FLAGS_SKIP_SW); | |
178 | } | |
179 | ||
8cbfe939 BZ |
180 | static int offload_action_init(struct flow_offload_action *fl_action, |
181 | struct tc_action *act, | |
182 | enum offload_act_command cmd, | |
183 | struct netlink_ext_ack *extack) | |
184 | { | |
963178a0 BZ |
185 | int err; |
186 | ||
8cbfe939 BZ |
187 | fl_action->extack = extack; |
188 | fl_action->command = cmd; | |
189 | fl_action->index = act->tcfa_index; | |
d307b2c6 | 190 | fl_action->cookie = (unsigned long)act; |
8cbfe939 | 191 | |
963178a0 BZ |
192 | if (act->ops->offload_act_setup) { |
193 | spin_lock_bh(&act->tcfa_lock); | |
194 | err = act->ops->offload_act_setup(act, fl_action, NULL, | |
c2ccf84e | 195 | false, extack); |
963178a0 BZ |
196 | spin_unlock_bh(&act->tcfa_lock); |
197 | return err; | |
198 | } | |
8cbfe939 BZ |
199 | |
200 | return -EOPNOTSUPP; | |
201 | } | |
202 | ||
13926d19 BZ |
203 | static int tcf_action_offload_cmd_ex(struct flow_offload_action *fl_act, |
204 | u32 *hw_count) | |
8cbfe939 BZ |
205 | { |
206 | int err; | |
207 | ||
208 | err = flow_indr_dev_setup_offload(NULL, NULL, TC_SETUP_ACT, | |
209 | fl_act, NULL, NULL); | |
210 | if (err < 0) | |
211 | return err; | |
212 | ||
7adc5765 BZ |
213 | if (hw_count) |
214 | *hw_count = err; | |
215 | ||
8cbfe939 BZ |
216 | return 0; |
217 | } | |
218 | ||
13926d19 BZ |
219 | static int tcf_action_offload_cmd_cb_ex(struct flow_offload_action *fl_act, |
220 | u32 *hw_count, | |
221 | flow_indr_block_bind_cb_t *cb, | |
222 | void *cb_priv) | |
223 | { | |
224 | int err; | |
225 | ||
226 | err = cb(NULL, NULL, cb_priv, TC_SETUP_ACT, NULL, fl_act, NULL); | |
227 | if (err < 0) | |
228 | return err; | |
229 | ||
230 | if (hw_count) | |
231 | *hw_count = 1; | |
232 | ||
233 | return 0; | |
234 | } | |
235 | ||
236 | static int tcf_action_offload_cmd(struct flow_offload_action *fl_act, | |
237 | u32 *hw_count, | |
238 | flow_indr_block_bind_cb_t *cb, | |
239 | void *cb_priv) | |
240 | { | |
241 | return cb ? tcf_action_offload_cmd_cb_ex(fl_act, hw_count, | |
242 | cb, cb_priv) : | |
243 | tcf_action_offload_cmd_ex(fl_act, hw_count); | |
244 | } | |
245 | ||
246 | static int tcf_action_offload_add_ex(struct tc_action *action, | |
247 | struct netlink_ext_ack *extack, | |
248 | flow_indr_block_bind_cb_t *cb, | |
249 | void *cb_priv) | |
8cbfe939 | 250 | { |
7adc5765 | 251 | bool skip_sw = tc_act_skip_sw(action->tcfa_flags); |
8cbfe939 BZ |
252 | struct tc_action *actions[TCA_ACT_MAX_PRIO] = { |
253 | [0] = action, | |
254 | }; | |
255 | struct flow_offload_action *fl_action; | |
7adc5765 | 256 | u32 in_hw_count = 0; |
8cbfe939 BZ |
257 | int num, err = 0; |
258 | ||
7adc5765 BZ |
259 | if (tc_act_skip_hw(action->tcfa_flags)) |
260 | return 0; | |
261 | ||
8cbfe939 BZ |
262 | num = tcf_offload_act_num_actions_single(action); |
263 | fl_action = offload_action_alloc(num); | |
264 | if (!fl_action) | |
265 | return -ENOMEM; | |
266 | ||
267 | err = offload_action_init(fl_action, action, FLOW_ACT_REPLACE, extack); | |
268 | if (err) | |
269 | goto fl_err; | |
270 | ||
80cd22c3 | 271 | err = tc_setup_action(&fl_action->action, actions, 0, extack); |
8cbfe939 BZ |
272 | if (err) { |
273 | NL_SET_ERR_MSG_MOD(extack, | |
ecf4a24c | 274 | "Failed to setup tc actions for offload"); |
8cbfe939 BZ |
275 | goto fl_err; |
276 | } | |
277 | ||
13926d19 | 278 | err = tcf_action_offload_cmd(fl_action, &in_hw_count, cb, cb_priv); |
7adc5765 | 279 | if (!err) |
13926d19 BZ |
280 | cb ? offload_action_hw_count_inc(action, in_hw_count) : |
281 | offload_action_hw_count_set(action, in_hw_count); | |
7adc5765 BZ |
282 | |
283 | if (skip_sw && !tc_act_in_hw(action)) | |
284 | err = -EINVAL; | |
285 | ||
8cbfe939 BZ |
286 | tc_cleanup_offload_action(&fl_action->action); |
287 | ||
288 | fl_err: | |
289 | kfree(fl_action); | |
290 | ||
291 | return err; | |
292 | } | |
293 | ||
13926d19 BZ |
294 | /* offload the tc action after it is inserted */ |
295 | static int tcf_action_offload_add(struct tc_action *action, | |
296 | struct netlink_ext_ack *extack) | |
297 | { | |
298 | return tcf_action_offload_add_ex(action, extack, NULL, NULL); | |
299 | } | |
300 | ||
c7a66f8d BZ |
301 | int tcf_action_update_hw_stats(struct tc_action *action) |
302 | { | |
303 | struct flow_offload_action fl_act = {}; | |
304 | int err; | |
305 | ||
c7a66f8d BZ |
306 | err = offload_action_init(&fl_act, action, FLOW_ACT_STATS, NULL); |
307 | if (err) | |
308 | return err; | |
309 | ||
13926d19 | 310 | err = tcf_action_offload_cmd(&fl_act, NULL, NULL, NULL); |
c7a66f8d BZ |
311 | if (!err) { |
312 | preempt_disable(); | |
313 | tcf_action_stats_update(action, fl_act.stats.bytes, | |
314 | fl_act.stats.pkts, | |
315 | fl_act.stats.drops, | |
316 | fl_act.stats.lastused, | |
317 | true); | |
318 | preempt_enable(); | |
319 | action->used_hw_stats = fl_act.stats.used_hw_stats; | |
320 | action->used_hw_stats_valid = true; | |
321 | } else { | |
322 | return -EOPNOTSUPP; | |
323 | } | |
324 | ||
325 | return 0; | |
326 | } | |
327 | EXPORT_SYMBOL(tcf_action_update_hw_stats); | |
328 | ||
13926d19 BZ |
329 | static int tcf_action_offload_del_ex(struct tc_action *action, |
330 | flow_indr_block_bind_cb_t *cb, | |
331 | void *cb_priv) | |
8cbfe939 BZ |
332 | { |
333 | struct flow_offload_action fl_act = {}; | |
7adc5765 | 334 | u32 in_hw_count = 0; |
8cbfe939 BZ |
335 | int err = 0; |
336 | ||
7adc5765 BZ |
337 | if (!tc_act_in_hw(action)) |
338 | return 0; | |
339 | ||
8cbfe939 BZ |
340 | err = offload_action_init(&fl_act, action, FLOW_ACT_DESTROY, NULL); |
341 | if (err) | |
342 | return err; | |
343 | ||
13926d19 BZ |
344 | err = tcf_action_offload_cmd(&fl_act, &in_hw_count, cb, cb_priv); |
345 | if (err < 0) | |
7adc5765 BZ |
346 | return err; |
347 | ||
13926d19 | 348 | if (!cb && action->in_hw_count != in_hw_count) |
7adc5765 BZ |
349 | return -EINVAL; |
350 | ||
13926d19 BZ |
351 | /* do not need to update hw state when deleting action */ |
352 | if (cb && in_hw_count) | |
353 | offload_action_hw_count_dec(action, in_hw_count); | |
354 | ||
7adc5765 | 355 | return 0; |
8cbfe939 BZ |
356 | } |
357 | ||
13926d19 BZ |
358 | static int tcf_action_offload_del(struct tc_action *action) |
359 | { | |
360 | return tcf_action_offload_del_ex(action, NULL, NULL); | |
361 | } | |
362 | ||
16af6067 | 363 | static void tcf_action_cleanup(struct tc_action *p) |
e9ce1cd3 | 364 | { |
8cbfe939 | 365 | tcf_action_offload_del(p); |
16af6067 VB |
366 | if (p->ops->cleanup) |
367 | p->ops->cleanup(p); | |
368 | ||
1c0d32fd | 369 | gen_kill_estimator(&p->tcfa_rate_est); |
d7fb60b9 | 370 | free_tcf(p); |
e9ce1cd3 | 371 | } |
e9ce1cd3 | 372 | |
16af6067 VB |
373 | static int __tcf_action_put(struct tc_action *p, bool bind) |
374 | { | |
375 | struct tcf_idrinfo *idrinfo = p->idrinfo; | |
376 | ||
95278dda | 377 | if (refcount_dec_and_mutex_lock(&p->tcfa_refcnt, &idrinfo->lock)) { |
16af6067 VB |
378 | if (bind) |
379 | atomic_dec(&p->tcfa_bindcnt); | |
380 | idr_remove(&idrinfo->action_idr, p->tcfa_index); | |
95278dda | 381 | mutex_unlock(&idrinfo->lock); |
16af6067 VB |
382 | |
383 | tcf_action_cleanup(p); | |
384 | return 1; | |
385 | } | |
386 | ||
387 | if (bind) | |
388 | atomic_dec(&p->tcfa_bindcnt); | |
389 | ||
390 | return 0; | |
391 | } | |
392 | ||
b3650bf7 | 393 | static int __tcf_idr_release(struct tc_action *p, bool bind, bool strict) |
e9ce1cd3 DM |
394 | { |
395 | int ret = 0; | |
396 | ||
036bb443 VB |
397 | /* Release with strict==1 and bind==0 is only called through act API |
398 | * interface (classifiers always bind). Only case when action with | |
399 | * positive reference count and zero bind count can exist is when it was | |
400 | * also created with act API (unbinding last classifier will destroy the | |
401 | * action if it was created by classifier). So only case when bind count | |
402 | * can be changed after initial check is when unbound action is | |
403 | * destroyed by act API while classifier binds to action with same id | |
404 | * concurrently. This result either creation of new action(same behavior | |
405 | * as before), or reusing existing action if concurrent process | |
406 | * increments reference count before action is deleted. Both scenarios | |
407 | * are acceptable. | |
408 | */ | |
e9ce1cd3 | 409 | if (p) { |
16af6067 | 410 | if (!bind && strict && atomic_read(&p->tcfa_bindcnt) > 0) |
55334a5d | 411 | return -EPERM; |
e9ce1cd3 | 412 | |
16af6067 | 413 | if (__tcf_action_put(p, bind)) |
1d4150c0 | 414 | ret = ACT_P_DELETED; |
e9ce1cd3 | 415 | } |
28e6b67f | 416 | |
e9ce1cd3 DM |
417 | return ret; |
418 | } | |
b3650bf7 VB |
419 | |
420 | int tcf_idr_release(struct tc_action *a, bool bind) | |
421 | { | |
422 | const struct tc_action_ops *ops = a->ops; | |
423 | int ret; | |
424 | ||
425 | ret = __tcf_idr_release(a, bind, false); | |
426 | if (ret == ACT_P_DELETED) | |
427 | module_put(ops->owner); | |
428 | return ret; | |
429 | } | |
430 | EXPORT_SYMBOL(tcf_idr_release); | |
e9ce1cd3 | 431 | |
4e76e75d RM |
432 | static size_t tcf_action_shared_attrs_size(const struct tc_action *act) |
433 | { | |
db4b4902 | 434 | struct tc_cookie *user_cookie; |
4e76e75d RM |
435 | u32 cookie_len = 0; |
436 | ||
e0479b67 | 437 | rcu_read_lock(); |
db4b4902 | 438 | user_cookie = rcu_dereference(act->user_cookie); |
e0479b67 | 439 | |
db4b4902 PB |
440 | if (user_cookie) |
441 | cookie_len = nla_total_size(user_cookie->len); | |
e0479b67 | 442 | rcu_read_unlock(); |
4e76e75d RM |
443 | |
444 | return nla_total_size(0) /* action number nested */ | |
445 | + nla_total_size(IFNAMSIZ) /* TCA_ACT_KIND */ | |
446 | + cookie_len /* TCA_ACT_COOKIE */ | |
0dfb2d82 | 447 | + nla_total_size(sizeof(struct nla_bitfield32)) /* TCA_ACT_HW_STATS */ |
4e76e75d | 448 | + nla_total_size(0) /* TCA_ACT_STATS nested */ |
1521a67e | 449 | + nla_total_size(sizeof(struct nla_bitfield32)) /* TCA_ACT_FLAGS */ |
4e76e75d RM |
450 | /* TCA_STATS_BASIC */ |
451 | + nla_total_size_64bit(sizeof(struct gnet_stats_basic)) | |
b33e699f ED |
452 | /* TCA_STATS_PKT64 */ |
453 | + nla_total_size_64bit(sizeof(u64)) | |
4e76e75d RM |
454 | /* TCA_STATS_QUEUE */ |
455 | + nla_total_size_64bit(sizeof(struct gnet_stats_queue)) | |
fcb3a465 | 456 | + nla_total_size(0) /* TCA_ACT_OPTIONS nested */ |
4e76e75d RM |
457 | + nla_total_size(sizeof(struct tcf_t)); /* TCA_GACT_TM */ |
458 | } | |
459 | ||
460 | static size_t tcf_action_full_attrs_size(size_t sz) | |
461 | { | |
462 | return NLMSG_HDRLEN /* struct nlmsghdr */ | |
463 | + sizeof(struct tcamsg) | |
464 | + nla_total_size(0) /* TCA_ACT_TAB nested */ | |
465 | + sz; | |
466 | } | |
467 | ||
468 | static size_t tcf_action_fill_size(const struct tc_action *act) | |
469 | { | |
470 | size_t sz = tcf_action_shared_attrs_size(act); | |
471 | ||
472 | if (act->ops->get_fill_size) | |
473 | return act->ops->get_fill_size(act) + sz; | |
474 | return sz; | |
475 | } | |
476 | ||
94f44f28 VB |
477 | static int |
478 | tcf_action_dump_terse(struct sk_buff *skb, struct tc_action *a, bool from_act) | |
479 | { | |
480 | unsigned char *b = skb_tail_pointer(skb); | |
481 | struct tc_cookie *cookie; | |
482 | ||
fcb3a465 | 483 | if (nla_put_string(skb, TCA_ACT_KIND, a->ops->kind)) |
94f44f28 VB |
484 | goto nla_put_failure; |
485 | if (tcf_action_copy_stats(skb, a, 0)) | |
486 | goto nla_put_failure; | |
487 | if (from_act && nla_put_u32(skb, TCA_ACT_INDEX, a->tcfa_index)) | |
488 | goto nla_put_failure; | |
489 | ||
490 | rcu_read_lock(); | |
db4b4902 | 491 | cookie = rcu_dereference(a->user_cookie); |
94f44f28 VB |
492 | if (cookie) { |
493 | if (nla_put(skb, TCA_ACT_COOKIE, cookie->len, cookie->data)) { | |
494 | rcu_read_unlock(); | |
495 | goto nla_put_failure; | |
496 | } | |
497 | } | |
498 | rcu_read_unlock(); | |
499 | ||
500 | return 0; | |
501 | ||
502 | nla_put_failure: | |
503 | nlmsg_trim(skb, b); | |
504 | return -1; | |
505 | } | |
506 | ||
65a206c0 | 507 | static int tcf_dump_walker(struct tcf_idrinfo *idrinfo, struct sk_buff *skb, |
a85a970a | 508 | struct netlink_callback *cb) |
e9ce1cd3 | 509 | { |
65a206c0 | 510 | int err = 0, index = -1, s_i = 0, n_i = 0; |
90825b23 | 511 | u32 act_flags = cb->args[2]; |
e62e484d | 512 | unsigned long jiffy_since = cb->args[3]; |
4b3550ef | 513 | struct nlattr *nest; |
65a206c0 CM |
514 | struct idr *idr = &idrinfo->action_idr; |
515 | struct tc_action *p; | |
516 | unsigned long id = 1; | |
e33d2b74 | 517 | unsigned long tmp; |
e9ce1cd3 | 518 | |
95278dda | 519 | mutex_lock(&idrinfo->lock); |
e9ce1cd3 DM |
520 | |
521 | s_i = cb->args[0]; | |
522 | ||
e33d2b74 | 523 | idr_for_each_entry_ul(idr, p, tmp, id) { |
65a206c0 CM |
524 | index++; |
525 | if (index < s_i) | |
526 | continue; | |
580e4273 CW |
527 | if (IS_ERR(p)) |
528 | continue; | |
65a206c0 CM |
529 | |
530 | if (jiffy_since && | |
531 | time_after(jiffy_since, | |
532 | (unsigned long)p->tcfa_tm.lastuse)) | |
533 | continue; | |
534 | ||
8f2ca70c OS |
535 | tcf_action_update_hw_stats(p); |
536 | ||
ae0be8de | 537 | nest = nla_nest_start_noflag(skb, n_i); |
734549eb CD |
538 | if (!nest) { |
539 | index--; | |
65a206c0 | 540 | goto nla_put_failure; |
734549eb | 541 | } |
f460019b | 542 | err = (act_flags & TCA_ACT_FLAG_TERSE_DUMP) ? |
94f44f28 VB |
543 | tcf_action_dump_terse(skb, p, true) : |
544 | tcf_action_dump_1(skb, p, 0, 0); | |
65a206c0 CM |
545 | if (err < 0) { |
546 | index--; | |
547 | nlmsg_trim(skb, nest); | |
548 | goto done; | |
e9ce1cd3 | 549 | } |
65a206c0 CM |
550 | nla_nest_end(skb, nest); |
551 | n_i++; | |
f460019b | 552 | if (!(act_flags & TCA_ACT_FLAG_LARGE_DUMP_ON) && |
65a206c0 CM |
553 | n_i >= TCA_ACT_MAX_PRIO) |
554 | goto done; | |
e9ce1cd3 DM |
555 | } |
556 | done: | |
e62e484d JHS |
557 | if (index >= 0) |
558 | cb->args[0] = index + 1; | |
559 | ||
95278dda | 560 | mutex_unlock(&idrinfo->lock); |
90825b23 | 561 | if (n_i) { |
f460019b | 562 | if (act_flags & TCA_ACT_FLAG_LARGE_DUMP_ON) |
90825b23 JHS |
563 | cb->args[1] = n_i; |
564 | } | |
e9ce1cd3 DM |
565 | return n_i; |
566 | ||
7ba699c6 | 567 | nla_put_failure: |
4b3550ef | 568 | nla_nest_cancel(skb, nest); |
e9ce1cd3 DM |
569 | goto done; |
570 | } | |
571 | ||
ec3ed293 VB |
572 | static int tcf_idr_release_unsafe(struct tc_action *p) |
573 | { | |
574 | if (atomic_read(&p->tcfa_bindcnt) > 0) | |
575 | return -EPERM; | |
576 | ||
577 | if (refcount_dec_and_test(&p->tcfa_refcnt)) { | |
578 | idr_remove(&p->idrinfo->action_idr, p->tcfa_index); | |
579 | tcf_action_cleanup(p); | |
580 | return ACT_P_DELETED; | |
581 | } | |
582 | ||
583 | return 0; | |
584 | } | |
585 | ||
65a206c0 | 586 | static int tcf_del_walker(struct tcf_idrinfo *idrinfo, struct sk_buff *skb, |
76b39b94 VN |
587 | const struct tc_action_ops *ops, |
588 | struct netlink_ext_ack *extack) | |
e9ce1cd3 | 589 | { |
4b3550ef | 590 | struct nlattr *nest; |
65a206c0 | 591 | int n_i = 0; |
55334a5d | 592 | int ret = -EINVAL; |
65a206c0 CM |
593 | struct idr *idr = &idrinfo->action_idr; |
594 | struct tc_action *p; | |
595 | unsigned long id = 1; | |
e33d2b74 | 596 | unsigned long tmp; |
e9ce1cd3 | 597 | |
ae0be8de | 598 | nest = nla_nest_start_noflag(skb, 0); |
4b3550ef PM |
599 | if (nest == NULL) |
600 | goto nla_put_failure; | |
fcb3a465 | 601 | if (nla_put_string(skb, TCA_ACT_KIND, ops->kind)) |
1b34ec43 | 602 | goto nla_put_failure; |
65a206c0 | 603 | |
76b39b94 | 604 | ret = 0; |
95278dda | 605 | mutex_lock(&idrinfo->lock); |
e33d2b74 | 606 | idr_for_each_entry_ul(idr, p, tmp, id) { |
0fedc63f CW |
607 | if (IS_ERR(p)) |
608 | continue; | |
ec3ed293 | 609 | ret = tcf_idr_release_unsafe(p); |
76b39b94 | 610 | if (ret == ACT_P_DELETED) |
255cd50f | 611 | module_put(ops->owner); |
76b39b94 VN |
612 | else if (ret < 0) |
613 | break; | |
614 | n_i++; | |
e9ce1cd3 | 615 | } |
95278dda | 616 | mutex_unlock(&idrinfo->lock); |
76b39b94 VN |
617 | if (ret < 0) { |
618 | if (n_i) | |
619 | NL_SET_ERR_MSG(extack, "Unable to flush all TC actions"); | |
620 | else | |
621 | goto nla_put_failure; | |
622 | } | |
ec3ed293 | 623 | |
55d96f72 YY |
624 | ret = nla_put_u32(skb, TCA_FCNT, n_i); |
625 | if (ret) | |
1b34ec43 | 626 | goto nla_put_failure; |
4b3550ef | 627 | nla_nest_end(skb, nest); |
e9ce1cd3 DM |
628 | |
629 | return n_i; | |
7ba699c6 | 630 | nla_put_failure: |
4b3550ef | 631 | nla_nest_cancel(skb, nest); |
55334a5d | 632 | return ret; |
e9ce1cd3 DM |
633 | } |
634 | ||
ddf97ccd WC |
635 | int tcf_generic_walker(struct tc_action_net *tn, struct sk_buff *skb, |
636 | struct netlink_callback *cb, int type, | |
b3620145 AA |
637 | const struct tc_action_ops *ops, |
638 | struct netlink_ext_ack *extack) | |
e9ce1cd3 | 639 | { |
65a206c0 | 640 | struct tcf_idrinfo *idrinfo = tn->idrinfo; |
ddf97ccd | 641 | |
e9ce1cd3 | 642 | if (type == RTM_DELACTION) { |
76b39b94 | 643 | return tcf_del_walker(idrinfo, skb, ops, extack); |
e9ce1cd3 | 644 | } else if (type == RTM_GETACTION) { |
65a206c0 | 645 | return tcf_dump_walker(idrinfo, skb, cb); |
e9ce1cd3 | 646 | } else { |
b3620145 AA |
647 | WARN(1, "tcf_generic_walker: unknown command %d\n", type); |
648 | NL_SET_ERR_MSG(extack, "tcf_generic_walker: unknown command"); | |
e9ce1cd3 DM |
649 | return -EINVAL; |
650 | } | |
651 | } | |
ddf97ccd | 652 | EXPORT_SYMBOL(tcf_generic_walker); |
e9ce1cd3 | 653 | |
7d485c45 | 654 | int tcf_idr_search(struct tc_action_net *tn, struct tc_action **a, u32 index) |
e9ce1cd3 | 655 | { |
3f7c72bc VB |
656 | struct tcf_idrinfo *idrinfo = tn->idrinfo; |
657 | struct tc_action *p; | |
e9ce1cd3 | 658 | |
95278dda | 659 | mutex_lock(&idrinfo->lock); |
322d884b | 660 | p = idr_find(&idrinfo->action_idr, index); |
7d485c45 | 661 | if (IS_ERR(p)) |
0190c1d4 | 662 | p = NULL; |
7d485c45 | 663 | else if (p) |
3f7c72bc | 664 | refcount_inc(&p->tcfa_refcnt); |
95278dda | 665 | mutex_unlock(&idrinfo->lock); |
e9ce1cd3 | 666 | |
3f7c72bc VB |
667 | if (p) { |
668 | *a = p; | |
669 | return true; | |
670 | } | |
671 | return false; | |
e9ce1cd3 | 672 | } |
65a206c0 | 673 | EXPORT_SYMBOL(tcf_idr_search); |
e9ce1cd3 | 674 | |
fae52d93 ZS |
675 | static int __tcf_generic_walker(struct net *net, struct sk_buff *skb, |
676 | struct netlink_callback *cb, int type, | |
677 | const struct tc_action_ops *ops, | |
678 | struct netlink_ext_ack *extack) | |
679 | { | |
680 | struct tc_action_net *tn = net_generic(net, ops->net_id); | |
681 | ||
682 | if (unlikely(ops->walk)) | |
683 | return ops->walk(net, skb, cb, type, ops, extack); | |
684 | ||
685 | return tcf_generic_walker(tn, skb, cb, type, ops, extack); | |
686 | } | |
687 | ||
688 | static int __tcf_idr_search(struct net *net, | |
689 | const struct tc_action_ops *ops, | |
690 | struct tc_action **a, u32 index) | |
691 | { | |
692 | struct tc_action_net *tn = net_generic(net, ops->net_id); | |
693 | ||
694 | if (unlikely(ops->lookup)) | |
695 | return ops->lookup(net, a, index); | |
696 | ||
697 | return tcf_idr_search(tn, a, index); | |
698 | } | |
699 | ||
97a3f84f | 700 | static int tcf_idr_delete_index(struct tcf_idrinfo *idrinfo, u32 index) |
2a2ea349 | 701 | { |
2a2ea349 VB |
702 | struct tc_action *p; |
703 | int ret = 0; | |
704 | ||
95278dda | 705 | mutex_lock(&idrinfo->lock); |
2a2ea349 VB |
706 | p = idr_find(&idrinfo->action_idr, index); |
707 | if (!p) { | |
95278dda | 708 | mutex_unlock(&idrinfo->lock); |
2a2ea349 VB |
709 | return -ENOENT; |
710 | } | |
711 | ||
712 | if (!atomic_read(&p->tcfa_bindcnt)) { | |
713 | if (refcount_dec_and_test(&p->tcfa_refcnt)) { | |
714 | struct module *owner = p->ops->owner; | |
715 | ||
716 | WARN_ON(p != idr_remove(&idrinfo->action_idr, | |
717 | p->tcfa_index)); | |
95278dda | 718 | mutex_unlock(&idrinfo->lock); |
2a2ea349 | 719 | |
16af6067 | 720 | tcf_action_cleanup(p); |
2a2ea349 VB |
721 | module_put(owner); |
722 | return 0; | |
723 | } | |
724 | ret = 0; | |
725 | } else { | |
726 | ret = -EPERM; | |
727 | } | |
728 | ||
95278dda | 729 | mutex_unlock(&idrinfo->lock); |
2a2ea349 VB |
730 | return ret; |
731 | } | |
2a2ea349 | 732 | |
65a206c0 CM |
733 | int tcf_idr_create(struct tc_action_net *tn, u32 index, struct nlattr *est, |
734 | struct tc_action **a, const struct tc_action_ops *ops, | |
e3822678 | 735 | int bind, bool cpustats, u32 flags) |
e9ce1cd3 | 736 | { |
ec0595cc | 737 | struct tc_action *p = kzalloc(ops->size, GFP_KERNEL); |
65a206c0 | 738 | struct tcf_idrinfo *idrinfo = tn->idrinfo; |
519c818e | 739 | int err = -ENOMEM; |
e9ce1cd3 DM |
740 | |
741 | if (unlikely(!p)) | |
86062033 | 742 | return -ENOMEM; |
036bb443 | 743 | refcount_set(&p->tcfa_refcnt, 1); |
e9ce1cd3 | 744 | if (bind) |
036bb443 | 745 | atomic_set(&p->tcfa_bindcnt, 1); |
e9ce1cd3 | 746 | |
519c818e | 747 | if (cpustats) { |
50dc9a85 | 748 | p->cpu_bstats = netdev_alloc_pcpu_stats(struct gnet_stats_basic_sync); |
339913a8 | 749 | if (!p->cpu_bstats) |
519c818e | 750 | goto err1; |
50dc9a85 | 751 | p->cpu_bstats_hw = netdev_alloc_pcpu_stats(struct gnet_stats_basic_sync); |
28169aba EC |
752 | if (!p->cpu_bstats_hw) |
753 | goto err2; | |
339913a8 MW |
754 | p->cpu_qstats = alloc_percpu(struct gnet_stats_queue); |
755 | if (!p->cpu_qstats) | |
28169aba | 756 | goto err3; |
519c818e | 757 | } |
50dc9a85 AD |
758 | gnet_stats_basic_sync_init(&p->tcfa_bstats); |
759 | gnet_stats_basic_sync_init(&p->tcfa_bstats_hw); | |
ec0595cc | 760 | spin_lock_init(&p->tcfa_lock); |
339913a8 | 761 | p->tcfa_index = index; |
ec0595cc WC |
762 | p->tcfa_tm.install = jiffies; |
763 | p->tcfa_tm.lastuse = jiffies; | |
764 | p->tcfa_tm.firstuse = 0; | |
e8cb5bcf | 765 | p->tcfa_flags = flags; |
0e991ec6 | 766 | if (est) { |
ec0595cc WC |
767 | err = gen_new_estimator(&p->tcfa_bstats, p->cpu_bstats, |
768 | &p->tcfa_rate_est, | |
29cbcd85 | 769 | &p->tcfa_lock, false, est); |
339913a8 | 770 | if (err) |
28169aba | 771 | goto err4; |
0e991ec6 SH |
772 | } |
773 | ||
65a206c0 | 774 | p->idrinfo = idrinfo; |
b3650bf7 | 775 | __module_get(ops->owner); |
ec0595cc | 776 | p->ops = ops; |
ec0595cc | 777 | *a = p; |
86062033 | 778 | return 0; |
28169aba | 779 | err4: |
339913a8 | 780 | free_percpu(p->cpu_qstats); |
28169aba EC |
781 | err3: |
782 | free_percpu(p->cpu_bstats_hw); | |
339913a8 MW |
783 | err2: |
784 | free_percpu(p->cpu_bstats); | |
785 | err1: | |
786 | kfree(p); | |
787 | return err; | |
e9ce1cd3 | 788 | } |
65a206c0 | 789 | EXPORT_SYMBOL(tcf_idr_create); |
e9ce1cd3 | 790 | |
e3822678 VB |
791 | int tcf_idr_create_from_flags(struct tc_action_net *tn, u32 index, |
792 | struct nlattr *est, struct tc_action **a, | |
793 | const struct tc_action_ops *ops, int bind, | |
794 | u32 flags) | |
795 | { | |
796 | /* Set cpustats according to actions flags. */ | |
797 | return tcf_idr_create(tn, index, est, a, ops, bind, | |
798 | !(flags & TCA_ACT_FLAGS_NO_PERCPU_STATS), flags); | |
799 | } | |
800 | EXPORT_SYMBOL(tcf_idr_create_from_flags); | |
801 | ||
0190c1d4 VB |
802 | /* Cleanup idr index that was allocated but not initialized. */ |
803 | ||
804 | void tcf_idr_cleanup(struct tc_action_net *tn, u32 index) | |
805 | { | |
806 | struct tcf_idrinfo *idrinfo = tn->idrinfo; | |
807 | ||
95278dda | 808 | mutex_lock(&idrinfo->lock); |
0190c1d4 VB |
809 | /* Remove ERR_PTR(-EBUSY) allocated by tcf_idr_check_alloc */ |
810 | WARN_ON(!IS_ERR(idr_remove(&idrinfo->action_idr, index))); | |
95278dda | 811 | mutex_unlock(&idrinfo->lock); |
0190c1d4 VB |
812 | } |
813 | EXPORT_SYMBOL(tcf_idr_cleanup); | |
814 | ||
815 | /* Check if action with specified index exists. If actions is found, increments | |
816 | * its reference and bind counters, and return 1. Otherwise insert temporary | |
817 | * error pointer (to prevent concurrent users from inserting actions with same | |
818 | * index) and return 0. | |
4b55e867 PT |
819 | * |
820 | * May return -EAGAIN for binding actions in case of a parallel add/delete on | |
821 | * the requested index. | |
0190c1d4 VB |
822 | */ |
823 | ||
824 | int tcf_idr_check_alloc(struct tc_action_net *tn, u32 *index, | |
825 | struct tc_action **a, int bind) | |
826 | { | |
827 | struct tcf_idrinfo *idrinfo = tn->idrinfo; | |
828 | struct tc_action *p; | |
829 | int ret; | |
4b55e867 | 830 | u32 max; |
0190c1d4 | 831 | |
0190c1d4 | 832 | if (*index) { |
4b55e867 | 833 | rcu_read_lock(); |
0190c1d4 | 834 | p = idr_find(&idrinfo->action_idr, *index); |
4b55e867 | 835 | |
0190c1d4 VB |
836 | if (IS_ERR(p)) { |
837 | /* This means that another process allocated | |
838 | * index but did not assign the pointer yet. | |
839 | */ | |
4b55e867 | 840 | rcu_read_unlock(); |
d8643198 | 841 | return -EAGAIN; |
0190c1d4 VB |
842 | } |
843 | ||
4b55e867 PT |
844 | if (!p) { |
845 | /* Empty slot, try to allocate it */ | |
846 | max = *index; | |
847 | rcu_read_unlock(); | |
848 | goto new; | |
849 | } | |
850 | ||
851 | if (!refcount_inc_not_zero(&p->tcfa_refcnt)) { | |
852 | /* Action was deleted in parallel */ | |
853 | rcu_read_unlock(); | |
854 | return -EAGAIN; | |
0190c1d4 | 855 | } |
4b55e867 PT |
856 | |
857 | if (bind) | |
858 | atomic_inc(&p->tcfa_bindcnt); | |
859 | *a = p; | |
860 | ||
861 | rcu_read_unlock(); | |
862 | ||
863 | return 1; | |
0190c1d4 | 864 | } else { |
4b55e867 | 865 | /* Find a slot */ |
0190c1d4 | 866 | *index = 1; |
4b55e867 | 867 | max = UINT_MAX; |
0190c1d4 | 868 | } |
4b55e867 PT |
869 | |
870 | new: | |
871 | *a = NULL; | |
872 | ||
873 | mutex_lock(&idrinfo->lock); | |
874 | ret = idr_alloc_u32(&idrinfo->action_idr, ERR_PTR(-EBUSY), index, max, | |
875 | GFP_KERNEL); | |
95278dda | 876 | mutex_unlock(&idrinfo->lock); |
4b55e867 PT |
877 | |
878 | /* N binds raced for action allocation, | |
879 | * retry for all the ones that failed. | |
880 | */ | |
881 | if (ret == -ENOSPC && *index == max) | |
882 | ret = -EAGAIN; | |
883 | ||
0190c1d4 VB |
884 | return ret; |
885 | } | |
886 | EXPORT_SYMBOL(tcf_idr_check_alloc); | |
887 | ||
65a206c0 CM |
888 | void tcf_idrinfo_destroy(const struct tc_action_ops *ops, |
889 | struct tcf_idrinfo *idrinfo) | |
1d4150c0 | 890 | { |
65a206c0 CM |
891 | struct idr *idr = &idrinfo->action_idr; |
892 | struct tc_action *p; | |
893 | int ret; | |
894 | unsigned long id = 1; | |
e33d2b74 | 895 | unsigned long tmp; |
1d4150c0 | 896 | |
e33d2b74 | 897 | idr_for_each_entry_ul(idr, p, tmp, id) { |
65a206c0 CM |
898 | ret = __tcf_idr_release(p, false, true); |
899 | if (ret == ACT_P_DELETED) | |
900 | module_put(ops->owner); | |
901 | else if (ret < 0) | |
902 | return; | |
1d4150c0 | 903 | } |
65a206c0 | 904 | idr_destroy(&idrinfo->action_idr); |
1d4150c0 | 905 | } |
65a206c0 | 906 | EXPORT_SYMBOL(tcf_idrinfo_destroy); |
1d4150c0 | 907 | |
1f747c26 | 908 | static LIST_HEAD(act_base); |
1da177e4 | 909 | static DEFINE_RWLOCK(act_mod_lock); |
13926d19 BZ |
910 | /* since act ops id is stored in pernet subsystem list, |
911 | * then there is no way to walk through only all the action | |
912 | * subsystem, so we keep tc action pernet ops id for | |
913 | * reoffload to walk through. | |
914 | */ | |
915 | static LIST_HEAD(act_pernet_id_list); | |
916 | static DEFINE_MUTEX(act_id_mutex); | |
917 | struct tc_act_pernet_id { | |
918 | struct list_head list; | |
919 | unsigned int id; | |
920 | }; | |
921 | ||
922 | static int tcf_pernet_add_id_list(unsigned int id) | |
923 | { | |
924 | struct tc_act_pernet_id *id_ptr; | |
925 | int ret = 0; | |
926 | ||
927 | mutex_lock(&act_id_mutex); | |
928 | list_for_each_entry(id_ptr, &act_pernet_id_list, list) { | |
929 | if (id_ptr->id == id) { | |
930 | ret = -EEXIST; | |
931 | goto err_out; | |
932 | } | |
933 | } | |
934 | ||
935 | id_ptr = kzalloc(sizeof(*id_ptr), GFP_KERNEL); | |
936 | if (!id_ptr) { | |
937 | ret = -ENOMEM; | |
938 | goto err_out; | |
939 | } | |
940 | id_ptr->id = id; | |
941 | ||
942 | list_add_tail(&id_ptr->list, &act_pernet_id_list); | |
943 | ||
944 | err_out: | |
945 | mutex_unlock(&act_id_mutex); | |
946 | return ret; | |
947 | } | |
948 | ||
949 | static void tcf_pernet_del_id_list(unsigned int id) | |
950 | { | |
951 | struct tc_act_pernet_id *id_ptr; | |
952 | ||
953 | mutex_lock(&act_id_mutex); | |
954 | list_for_each_entry(id_ptr, &act_pernet_id_list, list) { | |
955 | if (id_ptr->id == id) { | |
956 | list_del(&id_ptr->list); | |
957 | kfree(id_ptr); | |
958 | break; | |
959 | } | |
960 | } | |
961 | mutex_unlock(&act_id_mutex); | |
962 | } | |
1da177e4 | 963 | |
ddf97ccd WC |
964 | int tcf_register_action(struct tc_action_ops *act, |
965 | struct pernet_operations *ops) | |
1da177e4 | 966 | { |
1f747c26 | 967 | struct tc_action_ops *a; |
ddf97ccd | 968 | int ret; |
1da177e4 | 969 | |
fae52d93 | 970 | if (!act->act || !act->dump || !act->init) |
76c82d7a JHS |
971 | return -EINVAL; |
972 | ||
ab102b80 WC |
973 | /* We have to register pernet ops before making the action ops visible, |
974 | * otherwise tcf_action_init_1() could get a partially initialized | |
975 | * netns. | |
976 | */ | |
977 | ret = register_pernet_subsys(ops); | |
978 | if (ret) | |
979 | return ret; | |
980 | ||
13926d19 BZ |
981 | if (ops->id) { |
982 | ret = tcf_pernet_add_id_list(*ops->id); | |
983 | if (ret) | |
984 | goto err_id; | |
985 | } | |
986 | ||
1da177e4 | 987 | write_lock(&act_mod_lock); |
1f747c26 | 988 | list_for_each_entry(a, &act_base, head) { |
eddd2cf1 | 989 | if (act->id == a->id || (strcmp(act->kind, a->kind) == 0)) { |
13926d19 BZ |
990 | ret = -EEXIST; |
991 | goto err_out; | |
1da177e4 LT |
992 | } |
993 | } | |
1f747c26 | 994 | list_add_tail(&act->head, &act_base); |
1da177e4 | 995 | write_unlock(&act_mod_lock); |
ddf97ccd | 996 | |
1da177e4 | 997 | return 0; |
13926d19 BZ |
998 | |
999 | err_out: | |
1000 | write_unlock(&act_mod_lock); | |
1001 | if (ops->id) | |
1002 | tcf_pernet_del_id_list(*ops->id); | |
1003 | err_id: | |
1004 | unregister_pernet_subsys(ops); | |
1005 | return ret; | |
1da177e4 | 1006 | } |
62e3ba1b | 1007 | EXPORT_SYMBOL(tcf_register_action); |
1da177e4 | 1008 | |
ddf97ccd WC |
1009 | int tcf_unregister_action(struct tc_action_ops *act, |
1010 | struct pernet_operations *ops) | |
1da177e4 | 1011 | { |
1f747c26 | 1012 | struct tc_action_ops *a; |
1da177e4 LT |
1013 | int err = -ENOENT; |
1014 | ||
1015 | write_lock(&act_mod_lock); | |
a792866a ED |
1016 | list_for_each_entry(a, &act_base, head) { |
1017 | if (a == act) { | |
1018 | list_del(&act->head); | |
1019 | err = 0; | |
1da177e4 | 1020 | break; |
a792866a | 1021 | } |
1da177e4 LT |
1022 | } |
1023 | write_unlock(&act_mod_lock); | |
13926d19 | 1024 | if (!err) { |
ab102b80 | 1025 | unregister_pernet_subsys(ops); |
13926d19 BZ |
1026 | if (ops->id) |
1027 | tcf_pernet_del_id_list(*ops->id); | |
1028 | } | |
1da177e4 LT |
1029 | return err; |
1030 | } | |
62e3ba1b | 1031 | EXPORT_SYMBOL(tcf_unregister_action); |
1da177e4 LT |
1032 | |
1033 | /* lookup by name */ | |
1034 | static struct tc_action_ops *tc_lookup_action_n(char *kind) | |
1035 | { | |
a792866a | 1036 | struct tc_action_ops *a, *res = NULL; |
1da177e4 LT |
1037 | |
1038 | if (kind) { | |
1039 | read_lock(&act_mod_lock); | |
1f747c26 | 1040 | list_for_each_entry(a, &act_base, head) { |
1da177e4 | 1041 | if (strcmp(kind, a->kind) == 0) { |
a792866a ED |
1042 | if (try_module_get(a->owner)) |
1043 | res = a; | |
1da177e4 LT |
1044 | break; |
1045 | } | |
1046 | } | |
1047 | read_unlock(&act_mod_lock); | |
1048 | } | |
a792866a | 1049 | return res; |
1da177e4 LT |
1050 | } |
1051 | ||
7ba699c6 PM |
1052 | /* lookup by nlattr */ |
1053 | static struct tc_action_ops *tc_lookup_action(struct nlattr *kind) | |
1da177e4 | 1054 | { |
a792866a | 1055 | struct tc_action_ops *a, *res = NULL; |
1da177e4 LT |
1056 | |
1057 | if (kind) { | |
1058 | read_lock(&act_mod_lock); | |
1f747c26 | 1059 | list_for_each_entry(a, &act_base, head) { |
7ba699c6 | 1060 | if (nla_strcmp(kind, a->kind) == 0) { |
a792866a ED |
1061 | if (try_module_get(a->owner)) |
1062 | res = a; | |
1da177e4 LT |
1063 | break; |
1064 | } | |
1065 | } | |
1066 | read_unlock(&act_mod_lock); | |
1067 | } | |
a792866a | 1068 | return res; |
1da177e4 | 1069 | } |
1da177e4 | 1070 | |
e5a4b17d | 1071 | /*TCA_ACT_MAX_PRIO is 32, there count up to 32 */ |
e0ee84de | 1072 | #define TCA_ACT_MAX_PRIO_MASK 0x1FF |
22dc13c8 WC |
1073 | int tcf_action_exec(struct sk_buff *skb, struct tc_action **actions, |
1074 | int nr_actions, struct tcf_result *res) | |
1da177e4 | 1075 | { |
e0ee84de JHS |
1076 | u32 jmp_prgcnt = 0; |
1077 | u32 jmp_ttl = TCA_ACT_MAX_PRIO; /*matches actions per filter */ | |
ec1a9cca JP |
1078 | int i; |
1079 | int ret = TC_ACT_OK; | |
1da177e4 | 1080 | |
e7246e12 WB |
1081 | if (skb_skip_tc_classify(skb)) |
1082 | return TC_ACT_OK; | |
1083 | ||
e0ee84de | 1084 | restart_act_graph: |
22dc13c8 WC |
1085 | for (i = 0; i < nr_actions; i++) { |
1086 | const struct tc_action *a = actions[i]; | |
5740d068 | 1087 | int repeat_ttl; |
22dc13c8 | 1088 | |
e0ee84de JHS |
1089 | if (jmp_prgcnt > 0) { |
1090 | jmp_prgcnt -= 1; | |
1091 | continue; | |
1092 | } | |
7adc5765 BZ |
1093 | |
1094 | if (tc_act_skip_sw(a->tcfa_flags)) | |
1095 | continue; | |
5740d068 ED |
1096 | |
1097 | repeat_ttl = 32; | |
1da177e4 | 1098 | repeat: |
871cf386 | 1099 | ret = tc_act(skb, a, res); |
5740d068 ED |
1100 | if (unlikely(ret == TC_ACT_REPEAT)) { |
1101 | if (--repeat_ttl != 0) | |
1102 | goto repeat; | |
1103 | /* suspicious opcode, stop pipeline */ | |
1104 | net_warn_ratelimited("TC_ACT_REPEAT abuse ?\n"); | |
1105 | return TC_ACT_OK; | |
1106 | } | |
9da3242e | 1107 | if (TC_ACT_EXT_CMP(ret, TC_ACT_JUMP)) { |
e0ee84de JHS |
1108 | jmp_prgcnt = ret & TCA_ACT_MAX_PRIO_MASK; |
1109 | if (!jmp_prgcnt || (jmp_prgcnt > nr_actions)) { | |
1110 | /* faulty opcode, stop pipeline */ | |
1111 | return TC_ACT_OK; | |
1112 | } else { | |
1113 | jmp_ttl -= 1; | |
1114 | if (jmp_ttl > 0) | |
1115 | goto restart_act_graph; | |
1116 | else /* faulty graph, stop pipeline */ | |
1117 | return TC_ACT_OK; | |
1118 | } | |
db50514f | 1119 | } else if (TC_ACT_EXT_CMP(ret, TC_ACT_GOTO_CHAIN)) { |
ee3bbfe8 | 1120 | if (unlikely(!rcu_access_pointer(a->goto_chain))) { |
4cf24dc8 VN |
1121 | tcf_set_drop_reason(skb, |
1122 | SKB_DROP_REASON_TC_CHAIN_NOTFOUND); | |
ee3bbfe8 DC |
1123 | return TC_ACT_SHOT; |
1124 | } | |
db50514f | 1125 | tcf_action_goto_chain_exec(a, res); |
e0ee84de JHS |
1126 | } |
1127 | ||
63acd680 | 1128 | if (ret != TC_ACT_PIPE) |
e7246e12 | 1129 | break; |
1da177e4 | 1130 | } |
e0ee84de | 1131 | |
1da177e4 LT |
1132 | return ret; |
1133 | } | |
62e3ba1b | 1134 | EXPORT_SYMBOL(tcf_action_exec); |
1da177e4 | 1135 | |
90b73b77 | 1136 | int tcf_action_destroy(struct tc_action *actions[], int bind) |
1da177e4 | 1137 | { |
255cd50f | 1138 | const struct tc_action_ops *ops; |
90b73b77 VB |
1139 | struct tc_action *a; |
1140 | int ret = 0, i; | |
1da177e4 | 1141 | |
3872347e | 1142 | tcf_act_for_each_action(i, a, actions) { |
90b73b77 | 1143 | actions[i] = NULL; |
255cd50f | 1144 | ops = a->ops; |
65a206c0 | 1145 | ret = __tcf_idr_release(a, bind, true); |
55334a5d | 1146 | if (ret == ACT_P_DELETED) |
255cd50f | 1147 | module_put(ops->owner); |
55334a5d WC |
1148 | else if (ret < 0) |
1149 | return ret; | |
1da177e4 | 1150 | } |
55334a5d | 1151 | return ret; |
1da177e4 LT |
1152 | } |
1153 | ||
16af6067 VB |
1154 | static int tcf_action_put(struct tc_action *p) |
1155 | { | |
1156 | return __tcf_action_put(p, false); | |
1157 | } | |
1158 | ||
90b73b77 | 1159 | static void tcf_action_put_many(struct tc_action *actions[]) |
cae422f3 | 1160 | { |
a0e947c9 | 1161 | struct tc_action *a; |
90b73b77 | 1162 | int i; |
cae422f3 | 1163 | |
a0e947c9 PT |
1164 | tcf_act_for_each_action(i, a, actions) { |
1165 | const struct tc_action_ops *ops = a->ops; | |
1166 | if (tcf_action_put(a)) | |
1167 | module_put(ops->owner); | |
1168 | } | |
1169 | } | |
cae422f3 | 1170 | |
a0e947c9 PT |
1171 | static void tca_put_bound_many(struct tc_action *actions[], int init_res[]) |
1172 | { | |
1173 | struct tc_action *a; | |
1174 | int i; | |
1175 | ||
1176 | tcf_act_for_each_action(i, a, actions) { | |
1177 | const struct tc_action_ops *ops = a->ops; | |
1178 | ||
1179 | if (init_res[i] == ACT_P_CREATED) | |
edfaf94f | 1180 | continue; |
a0e947c9 | 1181 | |
cae422f3 VB |
1182 | if (tcf_action_put(a)) |
1183 | module_put(ops->owner); | |
1184 | } | |
1185 | } | |
1186 | ||
1da177e4 LT |
1187 | int |
1188 | tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int bind, int ref) | |
1189 | { | |
1da177e4 LT |
1190 | return a->ops->dump(skb, a, bind, ref); |
1191 | } | |
1192 | ||
ca44b738 VB |
1193 | int |
1194 | tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int bind, int ref) | |
1195 | { | |
1196 | int err = -EINVAL; | |
1197 | unsigned char *b = skb_tail_pointer(skb); | |
1198 | struct nlattr *nest; | |
e8cb5bcf | 1199 | u32 flags; |
ca44b738 | 1200 | |
94f44f28 | 1201 | if (tcf_action_dump_terse(skb, a, false)) |
ca44b738 VB |
1202 | goto nla_put_failure; |
1203 | ||
8953b077 JP |
1204 | if (a->hw_stats != TCA_ACT_HW_STATS_ANY && |
1205 | nla_put_bitfield32(skb, TCA_ACT_HW_STATS, | |
1206 | a->hw_stats, TCA_ACT_HW_STATS_ANY)) | |
1207 | goto nla_put_failure; | |
e3822678 | 1208 | |
93a129eb JP |
1209 | if (a->used_hw_stats_valid && |
1210 | nla_put_bitfield32(skb, TCA_ACT_USED_HW_STATS, | |
1211 | a->used_hw_stats, TCA_ACT_HW_STATS_ANY)) | |
1212 | goto nla_put_failure; | |
1213 | ||
e8cb5bcf BZ |
1214 | flags = a->tcfa_flags & TCA_ACT_FLAGS_USER_MASK; |
1215 | if (flags && | |
8953b077 | 1216 | nla_put_bitfield32(skb, TCA_ACT_FLAGS, |
e8cb5bcf | 1217 | flags, flags)) |
8953b077 | 1218 | goto nla_put_failure; |
e3822678 | 1219 | |
7adc5765 BZ |
1220 | if (nla_put_u32(skb, TCA_ACT_IN_HW_COUNT, a->in_hw_count)) |
1221 | goto nla_put_failure; | |
1222 | ||
fcb3a465 | 1223 | nest = nla_nest_start_noflag(skb, TCA_ACT_OPTIONS); |
4b3550ef PM |
1224 | if (nest == NULL) |
1225 | goto nla_put_failure; | |
cc7ec456 ED |
1226 | err = tcf_action_dump_old(skb, a, bind, ref); |
1227 | if (err > 0) { | |
4b3550ef | 1228 | nla_nest_end(skb, nest); |
1da177e4 LT |
1229 | return err; |
1230 | } | |
1231 | ||
7ba699c6 | 1232 | nla_put_failure: |
dc5fc579 | 1233 | nlmsg_trim(skb, b); |
1da177e4 LT |
1234 | return -1; |
1235 | } | |
62e3ba1b | 1236 | EXPORT_SYMBOL(tcf_action_dump_1); |
1da177e4 | 1237 | |
90b73b77 | 1238 | int tcf_action_dump(struct sk_buff *skb, struct tc_action *actions[], |
ca44b738 | 1239 | int bind, int ref, bool terse) |
1da177e4 LT |
1240 | { |
1241 | struct tc_action *a; | |
90b73b77 | 1242 | int err = -EINVAL, i; |
4b3550ef | 1243 | struct nlattr *nest; |
1da177e4 | 1244 | |
3872347e | 1245 | tcf_act_for_each_action(i, a, actions) { |
4097e9d2 | 1246 | nest = nla_nest_start_noflag(skb, i + 1); |
4b3550ef PM |
1247 | if (nest == NULL) |
1248 | goto nla_put_failure; | |
94f44f28 | 1249 | err = terse ? tcf_action_dump_terse(skb, a, false) : |
ca44b738 | 1250 | tcf_action_dump_1(skb, a, bind, ref); |
1da177e4 | 1251 | if (err < 0) |
4fe683f5 | 1252 | goto errout; |
4b3550ef | 1253 | nla_nest_end(skb, nest); |
1da177e4 LT |
1254 | } |
1255 | ||
1256 | return 0; | |
1257 | ||
7ba699c6 | 1258 | nla_put_failure: |
4fe683f5 TG |
1259 | err = -EINVAL; |
1260 | errout: | |
4b3550ef | 1261 | nla_nest_cancel(skb, nest); |
4fe683f5 | 1262 | return err; |
1da177e4 LT |
1263 | } |
1264 | ||
e0535ce5 | 1265 | static struct tc_cookie *nla_memdup_cookie(struct nlattr **tb) |
1045ba77 | 1266 | { |
e0535ce5 WB |
1267 | struct tc_cookie *c = kzalloc(sizeof(*c), GFP_KERNEL); |
1268 | if (!c) | |
1269 | return NULL; | |
1270 | ||
1271 | c->data = nla_memdup(tb[TCA_ACT_COOKIE], GFP_KERNEL); | |
1272 | if (!c->data) { | |
1273 | kfree(c); | |
1274 | return NULL; | |
1045ba77 | 1275 | } |
e0535ce5 | 1276 | c->len = nla_len(tb[TCA_ACT_COOKIE]); |
1045ba77 | 1277 | |
e0535ce5 | 1278 | return c; |
1045ba77 JHS |
1279 | } |
1280 | ||
0dfb2d82 | 1281 | static u8 tcf_action_hw_stats_get(struct nlattr *hw_stats_attr) |
44f86580 | 1282 | { |
0dfb2d82 | 1283 | struct nla_bitfield32 hw_stats_bf; |
44f86580 JP |
1284 | |
1285 | /* If the user did not pass the attr, that means he does | |
1286 | * not care about the type. Return "any" in that case | |
1287 | * which is setting on all supported types. | |
1288 | */ | |
0dfb2d82 JK |
1289 | if (!hw_stats_attr) |
1290 | return TCA_ACT_HW_STATS_ANY; | |
1291 | hw_stats_bf = nla_get_bitfield32(hw_stats_attr); | |
1292 | return hw_stats_bf.value; | |
44f86580 JP |
1293 | } |
1294 | ||
199ce850 | 1295 | static const struct nla_policy tcf_action_policy[TCA_ACT_MAX + 1] = { |
4b793fec | 1296 | [TCA_ACT_KIND] = { .type = NLA_STRING }, |
199ce850 CW |
1297 | [TCA_ACT_INDEX] = { .type = NLA_U32 }, |
1298 | [TCA_ACT_COOKIE] = { .type = NLA_BINARY, | |
1299 | .len = TC_COOKIE_MAX_SIZE }, | |
1300 | [TCA_ACT_OPTIONS] = { .type = NLA_NESTED }, | |
7adc5765 BZ |
1301 | [TCA_ACT_FLAGS] = NLA_POLICY_BITFIELD32(TCA_ACT_FLAGS_NO_PERCPU_STATS | |
1302 | TCA_ACT_FLAGS_SKIP_HW | | |
1303 | TCA_ACT_FLAGS_SKIP_SW), | |
47a1494b | 1304 | [TCA_ACT_HW_STATS] = NLA_POLICY_BITFIELD32(TCA_ACT_HW_STATS_ANY), |
199ce850 CW |
1305 | }; |
1306 | ||
1dd7f18f | 1307 | void tcf_idr_insert_many(struct tc_action *actions[], int init_res[]) |
e49d8c22 | 1308 | { |
f9bfc8eb | 1309 | struct tc_action *a; |
0fedc63f | 1310 | int i; |
e49d8c22 | 1311 | |
f9bfc8eb | 1312 | tcf_act_for_each_action(i, a, actions) { |
0fedc63f CW |
1313 | struct tcf_idrinfo *idrinfo; |
1314 | ||
c2a67de9 | 1315 | if (init_res[i] == ACT_P_BOUND) |
1dd7f18f PT |
1316 | continue; |
1317 | ||
0fedc63f CW |
1318 | idrinfo = a->idrinfo; |
1319 | mutex_lock(&idrinfo->lock); | |
1dd7f18f | 1320 | /* Replace ERR_PTR(-EBUSY) allocated by tcf_idr_check_alloc */ |
0fedc63f CW |
1321 | idr_replace(&idrinfo->action_idr, a, a->tcfa_index); |
1322 | mutex_unlock(&idrinfo->lock); | |
1323 | } | |
e49d8c22 CW |
1324 | } |
1325 | ||
405cd9fc | 1326 | struct tc_action_ops *tc_action_load_ops(struct nlattr *nla, u32 flags, |
d349f997 | 1327 | struct netlink_ext_ack *extack) |
1da177e4 | 1328 | { |
405cd9fc | 1329 | bool police = flags & TCA_ACT_FLAGS_POLICE; |
d349f997 | 1330 | struct nlattr *tb[TCA_ACT_MAX + 1]; |
1da177e4 LT |
1331 | struct tc_action_ops *a_o; |
1332 | char act_name[IFNAMSIZ]; | |
7ba699c6 | 1333 | struct nlattr *kind; |
ab27cfb8 | 1334 | int err; |
1da177e4 | 1335 | |
695176bf | 1336 | if (!police) { |
199ce850 CW |
1337 | err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla, |
1338 | tcf_action_policy, extack); | |
cee63723 | 1339 | if (err < 0) |
d349f997 | 1340 | return ERR_PTR(err); |
cee63723 | 1341 | err = -EINVAL; |
7ba699c6 | 1342 | kind = tb[TCA_ACT_KIND]; |
84ae017a AA |
1343 | if (!kind) { |
1344 | NL_SET_ERR_MSG(extack, "TC action kind must be specified"); | |
d349f997 | 1345 | return ERR_PTR(err); |
84ae017a | 1346 | } |
872f6903 | 1347 | if (nla_strscpy(act_name, kind, IFNAMSIZ) < 0) { |
4b793fec | 1348 | NL_SET_ERR_MSG(extack, "TC action name too long"); |
d349f997 | 1349 | return ERR_PTR(err); |
4b793fec | 1350 | } |
1da177e4 | 1351 | } else { |
989b52cd | 1352 | if (strscpy(act_name, "police", IFNAMSIZ) < 0) { |
84ae017a | 1353 | NL_SET_ERR_MSG(extack, "TC action name too long"); |
d349f997 | 1354 | return ERR_PTR(-EINVAL); |
84ae017a | 1355 | } |
1da177e4 LT |
1356 | } |
1357 | ||
1358 | a_o = tc_lookup_action_n(act_name); | |
1359 | if (a_o == NULL) { | |
95a5afca | 1360 | #ifdef CONFIG_MODULES |
405cd9fc PT |
1361 | bool rtnl_held = !(flags & TCA_ACT_FLAGS_NO_RTNL); |
1362 | ||
789871bb VB |
1363 | if (rtnl_held) |
1364 | rtnl_unlock(); | |
2c15a5ae | 1365 | request_module(NET_ACT_ALIAS_PREFIX "%s", act_name); |
789871bb VB |
1366 | if (rtnl_held) |
1367 | rtnl_lock(); | |
1da177e4 LT |
1368 | |
1369 | a_o = tc_lookup_action_n(act_name); | |
1370 | ||
1371 | /* We dropped the RTNL semaphore in order to | |
1372 | * perform the module load. So, even if we | |
1373 | * succeeded in loading the module we have to | |
1374 | * tell the caller to replay the request. We | |
1375 | * indicate this using -EAGAIN. | |
1376 | */ | |
1377 | if (a_o != NULL) { | |
d349f997 CW |
1378 | module_put(a_o->owner); |
1379 | return ERR_PTR(-EAGAIN); | |
1da177e4 LT |
1380 | } |
1381 | #endif | |
84ae017a | 1382 | NL_SET_ERR_MSG(extack, "Failed to load TC action module"); |
d349f997 | 1383 | return ERR_PTR(-ENOENT); |
1da177e4 LT |
1384 | } |
1385 | ||
d349f997 CW |
1386 | return a_o; |
1387 | } | |
1388 | ||
1389 | struct tc_action *tcf_action_init_1(struct net *net, struct tcf_proto *tp, | |
1390 | struct nlattr *nla, struct nlattr *est, | |
87c750e8 | 1391 | struct tc_action_ops *a_o, int *init_res, |
695176bf | 1392 | u32 flags, struct netlink_ext_ack *extack) |
d349f997 | 1393 | { |
695176bf CW |
1394 | bool police = flags & TCA_ACT_FLAGS_POLICE; |
1395 | struct nla_bitfield32 userflags = { 0, 0 }; | |
db4b4902 | 1396 | struct tc_cookie *user_cookie = NULL; |
d349f997 CW |
1397 | u8 hw_stats = TCA_ACT_HW_STATS_ANY; |
1398 | struct nlattr *tb[TCA_ACT_MAX + 1]; | |
d349f997 CW |
1399 | struct tc_action *a; |
1400 | int err; | |
1401 | ||
1da177e4 | 1402 | /* backward compatibility for policer */ |
695176bf | 1403 | if (!police) { |
d349f997 CW |
1404 | err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla, |
1405 | tcf_action_policy, extack); | |
1406 | if (err < 0) | |
1407 | return ERR_PTR(err); | |
1408 | if (tb[TCA_ACT_COOKIE]) { | |
db4b4902 PB |
1409 | user_cookie = nla_memdup_cookie(tb); |
1410 | if (!user_cookie) { | |
d349f997 CW |
1411 | NL_SET_ERR_MSG(extack, "No memory to generate TC cookie"); |
1412 | err = -ENOMEM; | |
1413 | goto err_out; | |
1414 | } | |
1415 | } | |
1416 | hw_stats = tcf_action_hw_stats_get(tb[TCA_ACT_HW_STATS]); | |
7adc5765 | 1417 | if (tb[TCA_ACT_FLAGS]) { |
695176bf | 1418 | userflags = nla_get_bitfield32(tb[TCA_ACT_FLAGS]); |
7adc5765 BZ |
1419 | if (!tc_act_flags_valid(userflags.value)) { |
1420 | err = -EINVAL; | |
1421 | goto err_out; | |
1422 | } | |
1423 | } | |
d349f997 | 1424 | |
695176bf CW |
1425 | err = a_o->init(net, tb[TCA_ACT_OPTIONS], est, &a, tp, |
1426 | userflags.value | flags, extack); | |
d349f997 | 1427 | } else { |
695176bf CW |
1428 | err = a_o->init(net, nla, est, &a, tp, userflags.value | flags, |
1429 | extack); | |
d349f997 | 1430 | } |
ab27cfb8 | 1431 | if (err < 0) |
d349f997 | 1432 | goto err_out; |
87c750e8 | 1433 | *init_res = err; |
1da177e4 | 1434 | |
695176bf | 1435 | if (!police && tb[TCA_ACT_COOKIE]) |
db4b4902 | 1436 | tcf_set_action_cookie(&a->user_cookie, user_cookie); |
1045ba77 | 1437 | |
695176bf | 1438 | if (!police) |
0dfb2d82 | 1439 | a->hw_stats = hw_stats; |
44f86580 | 1440 | |
1da177e4 LT |
1441 | return a; |
1442 | ||
d349f997 | 1443 | err_out: |
db4b4902 PB |
1444 | if (user_cookie) { |
1445 | kfree(user_cookie->data); | |
1446 | kfree(user_cookie); | |
e0535ce5 | 1447 | } |
ab27cfb8 | 1448 | return ERR_PTR(err); |
1da177e4 LT |
1449 | } |
1450 | ||
8cbfe939 BZ |
1451 | static bool tc_act_bind(u32 flags) |
1452 | { | |
1453 | return !!(flags & TCA_ACT_FLAGS_BIND); | |
1454 | } | |
1455 | ||
90b73b77 VB |
1456 | /* Returns numbers of initialized actions or negative error. */ |
1457 | ||
9fb9f251 | 1458 | int tcf_action_init(struct net *net, struct tcf_proto *tp, struct nlattr *nla, |
695176bf | 1459 | struct nlattr *est, struct tc_action *actions[], |
c86e0209 BZ |
1460 | int init_res[], size_t *attr_size, |
1461 | u32 flags, u32 fl_flags, | |
695176bf | 1462 | struct netlink_ext_ack *extack) |
1da177e4 | 1463 | { |
d349f997 | 1464 | struct tc_action_ops *ops[TCA_ACT_MAX_PRIO] = {}; |
cc7ec456 | 1465 | struct nlattr *tb[TCA_ACT_MAX_PRIO + 1]; |
33be6271 | 1466 | struct tc_action *act; |
4e76e75d | 1467 | size_t sz = 0; |
cee63723 | 1468 | int err; |
1da177e4 LT |
1469 | int i; |
1470 | ||
8cb08174 JB |
1471 | err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX_PRIO, nla, NULL, |
1472 | extack); | |
cee63723 | 1473 | if (err < 0) |
33be6271 | 1474 | return err; |
1da177e4 | 1475 | |
d349f997 CW |
1476 | for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) { |
1477 | struct tc_action_ops *a_o; | |
1478 | ||
405cd9fc | 1479 | a_o = tc_action_load_ops(tb[i], flags, extack); |
d349f997 CW |
1480 | if (IS_ERR(a_o)) { |
1481 | err = PTR_ERR(a_o); | |
1482 | goto err_mod; | |
1483 | } | |
1484 | ops[i - 1] = a_o; | |
1485 | } | |
1486 | ||
7ba699c6 | 1487 | for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) { |
695176bf CW |
1488 | act = tcf_action_init_1(net, tp, tb[i], est, ops[i - 1], |
1489 | &init_res[i - 1], flags, extack); | |
33be6271 WC |
1490 | if (IS_ERR(act)) { |
1491 | err = PTR_ERR(act); | |
1da177e4 | 1492 | goto err; |
33be6271 | 1493 | } |
4e76e75d | 1494 | sz += tcf_action_fill_size(act); |
90b73b77 VB |
1495 | /* Start from index 0 */ |
1496 | actions[i - 1] = act; | |
c86e0209 BZ |
1497 | if (tc_act_bind(flags)) { |
1498 | bool skip_sw = tc_skip_sw(fl_flags); | |
1499 | bool skip_hw = tc_skip_hw(fl_flags); | |
1500 | ||
1501 | if (tc_act_bind(act->tcfa_flags)) | |
1502 | continue; | |
1503 | if (skip_sw != tc_act_skip_sw(act->tcfa_flags) || | |
1504 | skip_hw != tc_act_skip_hw(act->tcfa_flags)) { | |
d922a99b BZ |
1505 | NL_SET_ERR_MSG(extack, |
1506 | "Mismatch between action and filter offload flags"); | |
c86e0209 BZ |
1507 | err = -EINVAL; |
1508 | goto err; | |
1509 | } | |
1510 | } else { | |
7adc5765 BZ |
1511 | err = tcf_action_offload_add(act, extack); |
1512 | if (tc_act_skip_sw(act->tcfa_flags) && err) | |
1513 | goto err; | |
1514 | } | |
1da177e4 | 1515 | } |
aecc5cef | 1516 | |
0fedc63f CW |
1517 | /* We have to commit them all together, because if any error happened in |
1518 | * between, we could not handle the failure gracefully. | |
1519 | */ | |
1dd7f18f | 1520 | tcf_idr_insert_many(actions, init_res); |
0fedc63f | 1521 | |
4e76e75d | 1522 | *attr_size = tcf_action_full_attrs_size(sz); |
b3650bf7 VB |
1523 | err = i - 1; |
1524 | goto err_mod; | |
1da177e4 LT |
1525 | |
1526 | err: | |
695176bf | 1527 | tcf_action_destroy(actions, flags & TCA_ACT_FLAGS_BIND); |
d349f997 | 1528 | err_mod: |
e09ac779 PT |
1529 | for (i = 0; i < TCA_ACT_MAX_PRIO && ops[i]; i++) |
1530 | module_put(ops[i]->owner); | |
33be6271 | 1531 | return err; |
1da177e4 LT |
1532 | } |
1533 | ||
4b61d3e8 PL |
1534 | void tcf_action_update_stats(struct tc_action *a, u64 bytes, u64 packets, |
1535 | u64 drops, bool hw) | |
c8ecebd0 | 1536 | { |
5e174d5e | 1537 | if (a->cpu_bstats) { |
50dc9a85 | 1538 | _bstats_update(this_cpu_ptr(a->cpu_bstats), bytes, packets); |
c8ecebd0 | 1539 | |
4b61d3e8 | 1540 | this_cpu_ptr(a->cpu_qstats)->drops += drops; |
5e174d5e VB |
1541 | |
1542 | if (hw) | |
50dc9a85 AD |
1543 | _bstats_update(this_cpu_ptr(a->cpu_bstats_hw), |
1544 | bytes, packets); | |
5e174d5e VB |
1545 | return; |
1546 | } | |
c8ecebd0 | 1547 | |
5e174d5e | 1548 | _bstats_update(&a->tcfa_bstats, bytes, packets); |
4b61d3e8 | 1549 | a->tcfa_qstats.drops += drops; |
c8ecebd0 | 1550 | if (hw) |
5e174d5e | 1551 | _bstats_update(&a->tcfa_bstats_hw, bytes, packets); |
c8ecebd0 VB |
1552 | } |
1553 | EXPORT_SYMBOL(tcf_action_update_stats); | |
1554 | ||
ec0595cc | 1555 | int tcf_action_copy_stats(struct sk_buff *skb, struct tc_action *p, |
1da177e4 LT |
1556 | int compat_mode) |
1557 | { | |
1558 | int err = 0; | |
1559 | struct gnet_dump d; | |
10297b99 | 1560 | |
7eb8896d | 1561 | if (p == NULL) |
1da177e4 LT |
1562 | goto errout; |
1563 | ||
1564 | /* compat_mode being true specifies a call that is supposed | |
06fe9fb4 | 1565 | * to add additional backward compatibility statistic TLVs. |
1da177e4 LT |
1566 | */ |
1567 | if (compat_mode) { | |
ec0595cc | 1568 | if (p->type == TCA_OLD_COMPAT) |
1da177e4 | 1569 | err = gnet_stats_start_copy_compat(skb, 0, |
9854518e ND |
1570 | TCA_STATS, |
1571 | TCA_XSTATS, | |
ec0595cc | 1572 | &p->tcfa_lock, &d, |
9854518e | 1573 | TCA_PAD); |
1da177e4 LT |
1574 | else |
1575 | return 0; | |
1576 | } else | |
1577 | err = gnet_stats_start_copy(skb, TCA_ACT_STATS, | |
ec0595cc | 1578 | &p->tcfa_lock, &d, TCA_ACT_PAD); |
1da177e4 LT |
1579 | |
1580 | if (err < 0) | |
1581 | goto errout; | |
1582 | ||
29cbcd85 AD |
1583 | if (gnet_stats_copy_basic(&d, p->cpu_bstats, |
1584 | &p->tcfa_bstats, false) < 0 || | |
1585 | gnet_stats_copy_basic_hw(&d, p->cpu_bstats_hw, | |
1586 | &p->tcfa_bstats_hw, false) < 0 || | |
1c0d32fd | 1587 | gnet_stats_copy_rate_est(&d, &p->tcfa_rate_est) < 0 || |
519c818e | 1588 | gnet_stats_copy_queue(&d, p->cpu_qstats, |
ec0595cc WC |
1589 | &p->tcfa_qstats, |
1590 | p->tcfa_qstats.qlen) < 0) | |
1da177e4 LT |
1591 | goto errout; |
1592 | ||
1593 | if (gnet_stats_finish_copy(&d) < 0) | |
1594 | goto errout; | |
1595 | ||
1596 | return 0; | |
1597 | ||
1598 | errout: | |
1599 | return -1; | |
1600 | } | |
1601 | ||
90b73b77 | 1602 | static int tca_get_fill(struct sk_buff *skb, struct tc_action *actions[], |
0b0f43fe | 1603 | u32 portid, u32 seq, u16 flags, int event, int bind, |
0349b877 | 1604 | int ref, struct netlink_ext_ack *extack) |
1da177e4 LT |
1605 | { |
1606 | struct tcamsg *t; | |
1607 | struct nlmsghdr *nlh; | |
27a884dc | 1608 | unsigned char *b = skb_tail_pointer(skb); |
4b3550ef | 1609 | struct nlattr *nest; |
1da177e4 | 1610 | |
15e47304 | 1611 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*t), flags); |
8b00a53c DM |
1612 | if (!nlh) |
1613 | goto out_nlmsg_trim; | |
1614 | t = nlmsg_data(nlh); | |
1da177e4 | 1615 | t->tca_family = AF_UNSPEC; |
9ef1d4c7 PM |
1616 | t->tca__pad1 = 0; |
1617 | t->tca__pad2 = 0; | |
10297b99 | 1618 | |
2f59823f HL |
1619 | if (extack && extack->_msg && |
1620 | nla_put_string(skb, TCA_ROOT_EXT_WARN_MSG, extack->_msg)) | |
1621 | goto out_nlmsg_trim; | |
1622 | ||
ae0be8de | 1623 | nest = nla_nest_start_noflag(skb, TCA_ACT_TAB); |
1af85155 | 1624 | if (!nest) |
8b00a53c | 1625 | goto out_nlmsg_trim; |
1da177e4 | 1626 | |
ca44b738 | 1627 | if (tcf_action_dump(skb, actions, bind, ref, false) < 0) |
8b00a53c | 1628 | goto out_nlmsg_trim; |
1da177e4 | 1629 | |
8de2bd02 HL |
1630 | nla_nest_end(skb, nest); |
1631 | ||
27a884dc | 1632 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
0349b877 | 1633 | |
1da177e4 LT |
1634 | return skb->len; |
1635 | ||
8b00a53c | 1636 | out_nlmsg_trim: |
dc5fc579 | 1637 | nlmsg_trim(skb, b); |
1da177e4 LT |
1638 | return -1; |
1639 | } | |
1640 | ||
1641 | static int | |
c4c4290c | 1642 | tcf_get_notify(struct net *net, u32 portid, struct nlmsghdr *n, |
90b73b77 | 1643 | struct tc_action *actions[], int event, |
84ae017a | 1644 | struct netlink_ext_ack *extack) |
1da177e4 LT |
1645 | { |
1646 | struct sk_buff *skb; | |
1da177e4 LT |
1647 | |
1648 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
1649 | if (!skb) | |
1650 | return -ENOBUFS; | |
0b0f43fe | 1651 | if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, event, |
0349b877 | 1652 | 0, 1, NULL) <= 0) { |
84ae017a | 1653 | NL_SET_ERR_MSG(extack, "Failed to fill netlink attributes while adding TC action"); |
1da177e4 LT |
1654 | kfree_skb(skb); |
1655 | return -EINVAL; | |
1656 | } | |
2942e900 | 1657 | |
15e47304 | 1658 | return rtnl_unicast(skb, net, portid); |
1da177e4 LT |
1659 | } |
1660 | ||
ddf97ccd | 1661 | static struct tc_action *tcf_action_get_1(struct net *net, struct nlattr *nla, |
84ae017a AA |
1662 | struct nlmsghdr *n, u32 portid, |
1663 | struct netlink_ext_ack *extack) | |
1da177e4 | 1664 | { |
cc7ec456 | 1665 | struct nlattr *tb[TCA_ACT_MAX + 1]; |
a85a970a | 1666 | const struct tc_action_ops *ops; |
1da177e4 LT |
1667 | struct tc_action *a; |
1668 | int index; | |
ab27cfb8 | 1669 | int err; |
1da177e4 | 1670 | |
199ce850 CW |
1671 | err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla, |
1672 | tcf_action_policy, extack); | |
cee63723 | 1673 | if (err < 0) |
ab27cfb8 | 1674 | goto err_out; |
1da177e4 | 1675 | |
cee63723 | 1676 | err = -EINVAL; |
7ba699c6 | 1677 | if (tb[TCA_ACT_INDEX] == NULL || |
84ae017a AA |
1678 | nla_len(tb[TCA_ACT_INDEX]) < sizeof(index)) { |
1679 | NL_SET_ERR_MSG(extack, "Invalid TC action index value"); | |
ab27cfb8 | 1680 | goto err_out; |
84ae017a | 1681 | } |
1587bac4 | 1682 | index = nla_get_u32(tb[TCA_ACT_INDEX]); |
1da177e4 | 1683 | |
ab27cfb8 | 1684 | err = -EINVAL; |
a85a970a | 1685 | ops = tc_lookup_action(tb[TCA_ACT_KIND]); |
84ae017a | 1686 | if (!ops) { /* could happen in batch of actions */ |
f061b48c | 1687 | NL_SET_ERR_MSG(extack, "Specified TC action kind not found"); |
a85a970a | 1688 | goto err_out; |
84ae017a | 1689 | } |
ab27cfb8 | 1690 | err = -ENOENT; |
fae52d93 | 1691 | if (__tcf_idr_search(net, ops, &a, index) == 0) { |
f061b48c | 1692 | NL_SET_ERR_MSG(extack, "TC action with specified index not found"); |
1da177e4 | 1693 | goto err_mod; |
f061b48c | 1694 | } |
1da177e4 | 1695 | |
a85a970a | 1696 | module_put(ops->owner); |
1da177e4 | 1697 | return a; |
ab27cfb8 | 1698 | |
1da177e4 | 1699 | err_mod: |
a85a970a | 1700 | module_put(ops->owner); |
ab27cfb8 PM |
1701 | err_out: |
1702 | return ERR_PTR(err); | |
1da177e4 LT |
1703 | } |
1704 | ||
7316ae88 | 1705 | static int tca_action_flush(struct net *net, struct nlattr *nla, |
84ae017a AA |
1706 | struct nlmsghdr *n, u32 portid, |
1707 | struct netlink_ext_ack *extack) | |
1da177e4 LT |
1708 | { |
1709 | struct sk_buff *skb; | |
1710 | unsigned char *b; | |
1711 | struct nlmsghdr *nlh; | |
1712 | struct tcamsg *t; | |
1713 | struct netlink_callback dcb; | |
4b3550ef | 1714 | struct nlattr *nest; |
cc7ec456 | 1715 | struct nlattr *tb[TCA_ACT_MAX + 1]; |
a85a970a | 1716 | const struct tc_action_ops *ops; |
7ba699c6 | 1717 | struct nlattr *kind; |
36723873 | 1718 | int err = -ENOMEM; |
1da177e4 | 1719 | |
1da177e4 | 1720 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
84ae017a | 1721 | if (!skb) |
36723873 | 1722 | return err; |
1da177e4 | 1723 | |
27a884dc | 1724 | b = skb_tail_pointer(skb); |
1da177e4 | 1725 | |
199ce850 CW |
1726 | err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla, |
1727 | tcf_action_policy, extack); | |
cee63723 | 1728 | if (err < 0) |
1da177e4 LT |
1729 | goto err_out; |
1730 | ||
cee63723 | 1731 | err = -EINVAL; |
7ba699c6 | 1732 | kind = tb[TCA_ACT_KIND]; |
a85a970a | 1733 | ops = tc_lookup_action(kind); |
84ae017a AA |
1734 | if (!ops) { /*some idjot trying to flush unknown action */ |
1735 | NL_SET_ERR_MSG(extack, "Cannot flush unknown TC action"); | |
1da177e4 | 1736 | goto err_out; |
84ae017a | 1737 | } |
1da177e4 | 1738 | |
0b0f43fe JHS |
1739 | nlh = nlmsg_put(skb, portid, n->nlmsg_seq, RTM_DELACTION, |
1740 | sizeof(*t), 0); | |
84ae017a AA |
1741 | if (!nlh) { |
1742 | NL_SET_ERR_MSG(extack, "Failed to create TC action flush notification"); | |
8b00a53c | 1743 | goto out_module_put; |
84ae017a | 1744 | } |
8b00a53c | 1745 | t = nlmsg_data(nlh); |
1da177e4 | 1746 | t->tca_family = AF_UNSPEC; |
9ef1d4c7 PM |
1747 | t->tca__pad1 = 0; |
1748 | t->tca__pad2 = 0; | |
1da177e4 | 1749 | |
ae0be8de | 1750 | nest = nla_nest_start_noflag(skb, TCA_ACT_TAB); |
84ae017a AA |
1751 | if (!nest) { |
1752 | NL_SET_ERR_MSG(extack, "Failed to add new netlink message"); | |
8b00a53c | 1753 | goto out_module_put; |
84ae017a | 1754 | } |
1da177e4 | 1755 | |
fae52d93 | 1756 | err = __tcf_generic_walker(net, skb, &dcb, RTM_DELACTION, ops, extack); |
66dede2d DC |
1757 | if (err <= 0) { |
1758 | nla_nest_cancel(skb, nest); | |
8b00a53c | 1759 | goto out_module_put; |
66dede2d | 1760 | } |
1da177e4 | 1761 | |
4b3550ef | 1762 | nla_nest_end(skb, nest); |
1da177e4 | 1763 | |
27a884dc | 1764 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 | 1765 | nlh->nlmsg_flags |= NLM_F_ROOT; |
a85a970a | 1766 | module_put(ops->owner); |
15e47304 | 1767 | err = rtnetlink_send(skb, net, portid, RTNLGRP_TC, |
cc7ec456 | 1768 | n->nlmsg_flags & NLM_F_ECHO); |
84ae017a AA |
1769 | if (err < 0) |
1770 | NL_SET_ERR_MSG(extack, "Failed to send TC action flush notification"); | |
1da177e4 LT |
1771 | |
1772 | return err; | |
1773 | ||
8b00a53c | 1774 | out_module_put: |
a85a970a | 1775 | module_put(ops->owner); |
1da177e4 LT |
1776 | err_out: |
1777 | kfree_skb(skb); | |
1da177e4 LT |
1778 | return err; |
1779 | } | |
1780 | ||
b144e7ec | 1781 | static int tcf_action_delete(struct net *net, struct tc_action *actions[]) |
16af6067 | 1782 | { |
3872347e | 1783 | struct tc_action *a; |
97a3f84f | 1784 | int i; |
16af6067 | 1785 | |
3872347e | 1786 | tcf_act_for_each_action(i, a, actions) { |
16af6067 | 1787 | const struct tc_action_ops *ops = a->ops; |
16af6067 VB |
1788 | /* Actions can be deleted concurrently so we must save their |
1789 | * type and id to search again after reference is released. | |
1790 | */ | |
97a3f84f CW |
1791 | struct tcf_idrinfo *idrinfo = a->idrinfo; |
1792 | u32 act_index = a->tcfa_index; | |
16af6067 | 1793 | |
c10bbfae | 1794 | actions[i] = NULL; |
16af6067 VB |
1795 | if (tcf_action_put(a)) { |
1796 | /* last reference, action was deleted concurrently */ | |
1797 | module_put(ops->owner); | |
3872347e | 1798 | } else { |
97a3f84f CW |
1799 | int ret; |
1800 | ||
16af6067 | 1801 | /* now do the delete */ |
97a3f84f | 1802 | ret = tcf_idr_delete_index(idrinfo, act_index); |
edfaf94f | 1803 | if (ret < 0) |
16af6067 VB |
1804 | return ret; |
1805 | } | |
1806 | } | |
1807 | return 0; | |
1808 | } | |
1809 | ||
8d4390f5 PT |
1810 | static struct sk_buff *tcf_reoffload_del_notify_msg(struct net *net, |
1811 | struct tc_action *action) | |
13926d19 BZ |
1812 | { |
1813 | size_t attr_size = tcf_action_fill_size(action); | |
1814 | struct tc_action *actions[TCA_ACT_MAX_PRIO] = { | |
1815 | [0] = action, | |
1816 | }; | |
13926d19 | 1817 | struct sk_buff *skb; |
13926d19 | 1818 | |
c73724bf | 1819 | skb = alloc_skb(max(attr_size, NLMSG_GOODSIZE), GFP_KERNEL); |
13926d19 | 1820 | if (!skb) |
8d4390f5 | 1821 | return ERR_PTR(-ENOBUFS); |
13926d19 | 1822 | |
0349b877 | 1823 | if (tca_get_fill(skb, actions, 0, 0, 0, RTM_DELACTION, 0, 1, NULL) <= 0) { |
13926d19 | 1824 | kfree_skb(skb); |
8d4390f5 PT |
1825 | return ERR_PTR(-EINVAL); |
1826 | } | |
1827 | ||
1828 | return skb; | |
1829 | } | |
1830 | ||
1831 | static int tcf_reoffload_del_notify(struct net *net, struct tc_action *action) | |
1832 | { | |
1833 | const struct tc_action_ops *ops = action->ops; | |
1834 | struct sk_buff *skb; | |
1835 | int ret; | |
1836 | ||
1837 | if (!rtnl_notify_needed(net, 0, RTNLGRP_TC)) { | |
1838 | skb = NULL; | |
1839 | } else { | |
1840 | skb = tcf_reoffload_del_notify_msg(net, action); | |
1841 | if (IS_ERR(skb)) | |
1842 | return PTR_ERR(skb); | |
13926d19 BZ |
1843 | } |
1844 | ||
1845 | ret = tcf_idr_release_unsafe(action); | |
1846 | if (ret == ACT_P_DELETED) { | |
1847 | module_put(ops->owner); | |
8d4390f5 | 1848 | ret = rtnetlink_maybe_send(skb, net, 0, RTNLGRP_TC, 0); |
13926d19 BZ |
1849 | } else { |
1850 | kfree_skb(skb); | |
1851 | } | |
1852 | ||
1853 | return ret; | |
1854 | } | |
1855 | ||
1856 | int tcf_action_reoffload_cb(flow_indr_block_bind_cb_t *cb, | |
1857 | void *cb_priv, bool add) | |
1858 | { | |
1859 | struct tc_act_pernet_id *id_ptr; | |
1860 | struct tcf_idrinfo *idrinfo; | |
1861 | struct tc_action_net *tn; | |
1862 | struct tc_action *p; | |
1863 | unsigned int act_id; | |
1864 | unsigned long tmp; | |
1865 | unsigned long id; | |
1866 | struct idr *idr; | |
1867 | struct net *net; | |
1868 | int ret; | |
1869 | ||
1870 | if (!cb) | |
1871 | return -EINVAL; | |
1872 | ||
1873 | down_read(&net_rwsem); | |
1874 | mutex_lock(&act_id_mutex); | |
1875 | ||
1876 | for_each_net(net) { | |
1877 | list_for_each_entry(id_ptr, &act_pernet_id_list, list) { | |
1878 | act_id = id_ptr->id; | |
1879 | tn = net_generic(net, act_id); | |
1880 | if (!tn) | |
1881 | continue; | |
1882 | idrinfo = tn->idrinfo; | |
1883 | if (!idrinfo) | |
1884 | continue; | |
1885 | ||
1886 | mutex_lock(&idrinfo->lock); | |
1887 | idr = &idrinfo->action_idr; | |
1888 | idr_for_each_entry_ul(idr, p, tmp, id) { | |
1889 | if (IS_ERR(p) || tc_act_bind(p->tcfa_flags)) | |
1890 | continue; | |
1891 | if (add) { | |
1892 | tcf_action_offload_add_ex(p, NULL, cb, | |
1893 | cb_priv); | |
1894 | continue; | |
1895 | } | |
1896 | ||
1897 | /* cb unregister to update hw count */ | |
1898 | ret = tcf_action_offload_del_ex(p, cb, cb_priv); | |
1899 | if (ret < 0) | |
1900 | continue; | |
1901 | if (tc_act_skip_sw(p->tcfa_flags) && | |
1902 | !tc_act_in_hw(p)) | |
1903 | tcf_reoffload_del_notify(net, p); | |
1904 | } | |
1905 | mutex_unlock(&idrinfo->lock); | |
1906 | } | |
1907 | } | |
1908 | mutex_unlock(&act_id_mutex); | |
1909 | up_read(&net_rwsem); | |
1910 | ||
1911 | return 0; | |
1912 | } | |
1913 | ||
8d4390f5 PT |
1914 | static struct sk_buff *tcf_del_notify_msg(struct net *net, struct nlmsghdr *n, |
1915 | struct tc_action *actions[], | |
1916 | u32 portid, size_t attr_size, | |
1917 | struct netlink_ext_ack *extack) | |
a56e1953 | 1918 | { |
a56e1953 WC |
1919 | struct sk_buff *skb; |
1920 | ||
c73724bf | 1921 | skb = alloc_skb(max(attr_size, NLMSG_GOODSIZE), GFP_KERNEL); |
a56e1953 | 1922 | if (!skb) |
8d4390f5 | 1923 | return ERR_PTR(-ENOBUFS); |
a56e1953 WC |
1924 | |
1925 | if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, RTM_DELACTION, | |
0349b877 | 1926 | 0, 2, extack) <= 0) { |
84ae017a | 1927 | NL_SET_ERR_MSG(extack, "Failed to fill netlink TC action attributes"); |
a56e1953 | 1928 | kfree_skb(skb); |
8d4390f5 PT |
1929 | return ERR_PTR(-EINVAL); |
1930 | } | |
1931 | ||
1932 | return skb; | |
1933 | } | |
1934 | ||
1935 | static int tcf_del_notify(struct net *net, struct nlmsghdr *n, | |
1936 | struct tc_action *actions[], u32 portid, | |
1937 | size_t attr_size, struct netlink_ext_ack *extack) | |
1938 | { | |
1939 | struct sk_buff *skb; | |
1940 | int ret; | |
1941 | ||
1942 | if (!rtnl_notify_needed(net, n->nlmsg_flags, RTNLGRP_TC)) { | |
1943 | skb = NULL; | |
1944 | } else { | |
1945 | skb = tcf_del_notify_msg(net, n, actions, portid, attr_size, | |
1946 | extack); | |
1947 | if (IS_ERR(skb)) | |
1948 | return PTR_ERR(skb); | |
a56e1953 WC |
1949 | } |
1950 | ||
1951 | /* now do the delete */ | |
b144e7ec | 1952 | ret = tcf_action_delete(net, actions); |
55334a5d | 1953 | if (ret < 0) { |
84ae017a | 1954 | NL_SET_ERR_MSG(extack, "Failed to delete TC action"); |
55334a5d WC |
1955 | kfree_skb(skb); |
1956 | return ret; | |
1957 | } | |
a56e1953 | 1958 | |
8d4390f5 PT |
1959 | return rtnetlink_maybe_send(skb, net, portid, RTNLGRP_TC, |
1960 | n->nlmsg_flags & NLM_F_ECHO); | |
a56e1953 WC |
1961 | } |
1962 | ||
1da177e4 | 1963 | static int |
7316ae88 | 1964 | tca_action_gd(struct net *net, struct nlattr *nla, struct nlmsghdr *n, |
84ae017a | 1965 | u32 portid, int event, struct netlink_ext_ack *extack) |
1da177e4 | 1966 | { |
cee63723 | 1967 | int i, ret; |
cc7ec456 | 1968 | struct nlattr *tb[TCA_ACT_MAX_PRIO + 1]; |
33be6271 | 1969 | struct tc_action *act; |
d04e6990 | 1970 | size_t attr_size = 0; |
edfaf94f | 1971 | struct tc_action *actions[TCA_ACT_MAX_PRIO] = {}; |
1da177e4 | 1972 | |
8cb08174 JB |
1973 | ret = nla_parse_nested_deprecated(tb, TCA_ACT_MAX_PRIO, nla, NULL, |
1974 | extack); | |
cee63723 PM |
1975 | if (ret < 0) |
1976 | return ret; | |
1da177e4 | 1977 | |
cc7ec456 | 1978 | if (event == RTM_DELACTION && n->nlmsg_flags & NLM_F_ROOT) { |
1af85155 | 1979 | if (tb[1]) |
84ae017a | 1980 | return tca_action_flush(net, tb[1], n, portid, extack); |
1af85155 | 1981 | |
84ae017a | 1982 | NL_SET_ERR_MSG(extack, "Invalid netlink attributes while flushing TC action"); |
1af85155 | 1983 | return -EINVAL; |
1da177e4 LT |
1984 | } |
1985 | ||
7ba699c6 | 1986 | for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) { |
84ae017a | 1987 | act = tcf_action_get_1(net, tb[i], n, portid, extack); |
ab27cfb8 PM |
1988 | if (IS_ERR(act)) { |
1989 | ret = PTR_ERR(act); | |
1da177e4 | 1990 | goto err; |
ab27cfb8 | 1991 | } |
4e76e75d | 1992 | attr_size += tcf_action_fill_size(act); |
90b73b77 | 1993 | actions[i - 1] = act; |
1da177e4 | 1994 | } |
4e76e75d RM |
1995 | |
1996 | attr_size = tcf_action_full_attrs_size(attr_size); | |
1da177e4 LT |
1997 | |
1998 | if (event == RTM_GETACTION) | |
90b73b77 | 1999 | ret = tcf_get_notify(net, portid, n, actions, event, extack); |
1da177e4 | 2000 | else { /* delete */ |
edfaf94f | 2001 | ret = tcf_del_notify(net, n, actions, portid, attr_size, extack); |
a56e1953 | 2002 | if (ret) |
1da177e4 | 2003 | goto err; |
edfaf94f | 2004 | return 0; |
1da177e4 LT |
2005 | } |
2006 | err: | |
edfaf94f | 2007 | tcf_action_put_many(actions); |
1da177e4 LT |
2008 | return ret; |
2009 | } | |
2010 | ||
8d4390f5 PT |
2011 | static struct sk_buff *tcf_add_notify_msg(struct net *net, struct nlmsghdr *n, |
2012 | struct tc_action *actions[], | |
2013 | u32 portid, size_t attr_size, | |
2014 | struct netlink_ext_ack *extack) | |
1da177e4 | 2015 | { |
1da177e4 | 2016 | struct sk_buff *skb; |
1da177e4 | 2017 | |
c73724bf | 2018 | skb = alloc_skb(max(attr_size, NLMSG_GOODSIZE), GFP_KERNEL); |
1da177e4 | 2019 | if (!skb) |
8d4390f5 | 2020 | return ERR_PTR(-ENOBUFS); |
1da177e4 | 2021 | |
a56e1953 | 2022 | if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, n->nlmsg_flags, |
0349b877 | 2023 | RTM_NEWACTION, 0, 0, extack) <= 0) { |
d143b9e3 | 2024 | NL_SET_ERR_MSG(extack, "Failed to fill netlink attributes while adding TC action"); |
a56e1953 | 2025 | kfree_skb(skb); |
8d4390f5 PT |
2026 | return ERR_PTR(-EINVAL); |
2027 | } | |
2028 | ||
2029 | return skb; | |
2030 | } | |
2031 | ||
2032 | static int tcf_add_notify(struct net *net, struct nlmsghdr *n, | |
2033 | struct tc_action *actions[], u32 portid, | |
2034 | size_t attr_size, struct netlink_ext_ack *extack) | |
2035 | { | |
2036 | struct sk_buff *skb; | |
2037 | ||
2038 | if (!rtnl_notify_needed(net, n->nlmsg_flags, RTNLGRP_TC)) { | |
2039 | skb = NULL; | |
2040 | } else { | |
2041 | skb = tcf_add_notify_msg(net, n, actions, portid, attr_size, | |
2042 | extack); | |
2043 | if (IS_ERR(skb)) | |
2044 | return PTR_ERR(skb); | |
a56e1953 | 2045 | } |
10297b99 | 2046 | |
8d4390f5 PT |
2047 | return rtnetlink_maybe_send(skb, net, portid, RTNLGRP_TC, |
2048 | n->nlmsg_flags & NLM_F_ECHO); | |
1da177e4 LT |
2049 | } |
2050 | ||
5a7a5555 | 2051 | static int tcf_action_add(struct net *net, struct nlattr *nla, |
695176bf | 2052 | struct nlmsghdr *n, u32 portid, u32 flags, |
aea0d727 | 2053 | struct netlink_ext_ack *extack) |
1da177e4 | 2054 | { |
d04e6990 | 2055 | size_t attr_size = 0; |
a0e947c9 | 2056 | int loop, ret; |
90b73b77 | 2057 | struct tc_action *actions[TCA_ACT_MAX_PRIO] = {}; |
87c750e8 | 2058 | int init_res[TCA_ACT_MAX_PRIO] = {}; |
1da177e4 | 2059 | |
39f13ea2 | 2060 | for (loop = 0; loop < 10; loop++) { |
695176bf | 2061 | ret = tcf_action_init(net, NULL, nla, NULL, actions, init_res, |
c86e0209 | 2062 | &attr_size, flags, 0, extack); |
39f13ea2 ED |
2063 | if (ret != -EAGAIN) |
2064 | break; | |
2065 | } | |
2066 | ||
90b73b77 | 2067 | if (ret < 0) |
f07fed82 | 2068 | return ret; |
a0e947c9 | 2069 | |
90b73b77 | 2070 | ret = tcf_add_notify(net, n, actions, portid, attr_size, extack); |
87c750e8 | 2071 | |
a0e947c9 PT |
2072 | /* only put bound actions */ |
2073 | tca_put_bound_many(actions, init_res); | |
1da177e4 | 2074 | |
cae422f3 | 2075 | return ret; |
1da177e4 LT |
2076 | } |
2077 | ||
90825b23 | 2078 | static const struct nla_policy tcaa_policy[TCA_ROOT_MAX + 1] = { |
f460019b VB |
2079 | [TCA_ROOT_FLAGS] = NLA_POLICY_BITFIELD32(TCA_ACT_FLAG_LARGE_DUMP_ON | |
2080 | TCA_ACT_FLAG_TERSE_DUMP), | |
e62e484d | 2081 | [TCA_ROOT_TIME_DELTA] = { .type = NLA_U32 }, |
90825b23 JHS |
2082 | }; |
2083 | ||
c21ef3e3 DA |
2084 | static int tc_ctl_action(struct sk_buff *skb, struct nlmsghdr *n, |
2085 | struct netlink_ext_ack *extack) | |
1da177e4 | 2086 | { |
3b1e0a65 | 2087 | struct net *net = sock_net(skb->sk); |
90825b23 | 2088 | struct nlattr *tca[TCA_ROOT_MAX + 1]; |
8bf15395 | 2089 | u32 portid = NETLINK_CB(skb).portid; |
695176bf CW |
2090 | u32 flags = 0; |
2091 | int ret = 0; | |
1da177e4 | 2092 | |
0b0f43fe JHS |
2093 | if ((n->nlmsg_type != RTM_GETACTION) && |
2094 | !netlink_capable(skb, CAP_NET_ADMIN)) | |
dfc47ef8 EB |
2095 | return -EPERM; |
2096 | ||
8cb08174 JB |
2097 | ret = nlmsg_parse_deprecated(n, sizeof(struct tcamsg), tca, |
2098 | TCA_ROOT_MAX, NULL, extack); | |
7ba699c6 PM |
2099 | if (ret < 0) |
2100 | return ret; | |
2101 | ||
2102 | if (tca[TCA_ACT_TAB] == NULL) { | |
84ae017a | 2103 | NL_SET_ERR_MSG(extack, "Netlink action attributes missing"); |
1da177e4 LT |
2104 | return -EINVAL; |
2105 | } | |
2106 | ||
cc7ec456 | 2107 | /* n->nlmsg_flags & NLM_F_CREATE */ |
1da177e4 LT |
2108 | switch (n->nlmsg_type) { |
2109 | case RTM_NEWACTION: | |
2110 | /* we are going to assume all other flags | |
25985edc | 2111 | * imply create only if it doesn't exist |
1da177e4 LT |
2112 | * Note that CREATE | EXCL implies that |
2113 | * but since we want avoid ambiguity (eg when flags | |
2114 | * is zero) then just set this | |
2115 | */ | |
cc7ec456 | 2116 | if (n->nlmsg_flags & NLM_F_REPLACE) |
695176bf CW |
2117 | flags = TCA_ACT_FLAGS_REPLACE; |
2118 | ret = tcf_action_add(net, tca[TCA_ACT_TAB], n, portid, flags, | |
aea0d727 | 2119 | extack); |
1da177e4 LT |
2120 | break; |
2121 | case RTM_DELACTION: | |
7316ae88 | 2122 | ret = tca_action_gd(net, tca[TCA_ACT_TAB], n, |
84ae017a | 2123 | portid, RTM_DELACTION, extack); |
1da177e4 LT |
2124 | break; |
2125 | case RTM_GETACTION: | |
7316ae88 | 2126 | ret = tca_action_gd(net, tca[TCA_ACT_TAB], n, |
84ae017a | 2127 | portid, RTM_GETACTION, extack); |
1da177e4 LT |
2128 | break; |
2129 | default: | |
2130 | BUG(); | |
2131 | } | |
2132 | ||
2133 | return ret; | |
2134 | } | |
2135 | ||
90825b23 | 2136 | static struct nlattr *find_dump_kind(struct nlattr **nla) |
1da177e4 | 2137 | { |
cc7ec456 | 2138 | struct nlattr *tb1, *tb2[TCA_ACT_MAX + 1]; |
7ba699c6 | 2139 | struct nlattr *tb[TCA_ACT_MAX_PRIO + 1]; |
7ba699c6 | 2140 | struct nlattr *kind; |
1da177e4 | 2141 | |
7ba699c6 | 2142 | tb1 = nla[TCA_ACT_TAB]; |
1da177e4 LT |
2143 | if (tb1 == NULL) |
2144 | return NULL; | |
2145 | ||
8cb08174 | 2146 | if (nla_parse_deprecated(tb, TCA_ACT_MAX_PRIO, nla_data(tb1), NLMSG_ALIGN(nla_len(tb1)), NULL, NULL) < 0) |
1da177e4 | 2147 | return NULL; |
1da177e4 | 2148 | |
6d834e04 PM |
2149 | if (tb[1] == NULL) |
2150 | return NULL; | |
199ce850 | 2151 | if (nla_parse_nested_deprecated(tb2, TCA_ACT_MAX, tb[1], tcf_action_policy, NULL) < 0) |
1da177e4 | 2152 | return NULL; |
7ba699c6 | 2153 | kind = tb2[TCA_ACT_KIND]; |
1da177e4 | 2154 | |
26dab893 | 2155 | return kind; |
1da177e4 LT |
2156 | } |
2157 | ||
5a7a5555 | 2158 | static int tc_dump_action(struct sk_buff *skb, struct netlink_callback *cb) |
1da177e4 | 2159 | { |
ddf97ccd | 2160 | struct net *net = sock_net(skb->sk); |
1da177e4 | 2161 | struct nlmsghdr *nlh; |
27a884dc | 2162 | unsigned char *b = skb_tail_pointer(skb); |
4b3550ef | 2163 | struct nlattr *nest; |
1da177e4 | 2164 | struct tc_action_ops *a_o; |
1da177e4 | 2165 | int ret = 0; |
8b00a53c | 2166 | struct tcamsg *t = (struct tcamsg *) nlmsg_data(cb->nlh); |
90825b23 JHS |
2167 | struct nlattr *tb[TCA_ROOT_MAX + 1]; |
2168 | struct nlattr *count_attr = NULL; | |
e62e484d | 2169 | unsigned long jiffy_since = 0; |
90825b23 JHS |
2170 | struct nlattr *kind = NULL; |
2171 | struct nla_bitfield32 bf; | |
e62e484d | 2172 | u32 msecs_since = 0; |
90825b23 JHS |
2173 | u32 act_count = 0; |
2174 | ||
8cb08174 JB |
2175 | ret = nlmsg_parse_deprecated(cb->nlh, sizeof(struct tcamsg), tb, |
2176 | TCA_ROOT_MAX, tcaa_policy, cb->extack); | |
90825b23 JHS |
2177 | if (ret < 0) |
2178 | return ret; | |
1da177e4 | 2179 | |
90825b23 | 2180 | kind = find_dump_kind(tb); |
1da177e4 | 2181 | if (kind == NULL) { |
6ff9c364 | 2182 | pr_info("tc_dump_action: action bad kind\n"); |
1da177e4 LT |
2183 | return 0; |
2184 | } | |
2185 | ||
26dab893 | 2186 | a_o = tc_lookup_action(kind); |
cc7ec456 | 2187 | if (a_o == NULL) |
1da177e4 | 2188 | return 0; |
1da177e4 | 2189 | |
90825b23 JHS |
2190 | cb->args[2] = 0; |
2191 | if (tb[TCA_ROOT_FLAGS]) { | |
2192 | bf = nla_get_bitfield32(tb[TCA_ROOT_FLAGS]); | |
2193 | cb->args[2] = bf.value; | |
2194 | } | |
2195 | ||
e62e484d JHS |
2196 | if (tb[TCA_ROOT_TIME_DELTA]) { |
2197 | msecs_since = nla_get_u32(tb[TCA_ROOT_TIME_DELTA]); | |
2198 | } | |
2199 | ||
15e47304 | 2200 | nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, |
8b00a53c DM |
2201 | cb->nlh->nlmsg_type, sizeof(*t), 0); |
2202 | if (!nlh) | |
2203 | goto out_module_put; | |
90825b23 | 2204 | |
e62e484d JHS |
2205 | if (msecs_since) |
2206 | jiffy_since = jiffies - msecs_to_jiffies(msecs_since); | |
2207 | ||
8b00a53c | 2208 | t = nlmsg_data(nlh); |
1da177e4 | 2209 | t->tca_family = AF_UNSPEC; |
9ef1d4c7 PM |
2210 | t->tca__pad1 = 0; |
2211 | t->tca__pad2 = 0; | |
e62e484d | 2212 | cb->args[3] = jiffy_since; |
90825b23 JHS |
2213 | count_attr = nla_reserve(skb, TCA_ROOT_COUNT, sizeof(u32)); |
2214 | if (!count_attr) | |
2215 | goto out_module_put; | |
1da177e4 | 2216 | |
ae0be8de | 2217 | nest = nla_nest_start_noflag(skb, TCA_ACT_TAB); |
4b3550ef | 2218 | if (nest == NULL) |
8b00a53c | 2219 | goto out_module_put; |
1da177e4 | 2220 | |
fae52d93 | 2221 | ret = __tcf_generic_walker(net, skb, cb, RTM_GETACTION, a_o, NULL); |
1da177e4 | 2222 | if (ret < 0) |
8b00a53c | 2223 | goto out_module_put; |
1da177e4 LT |
2224 | |
2225 | if (ret > 0) { | |
4b3550ef | 2226 | nla_nest_end(skb, nest); |
1da177e4 | 2227 | ret = skb->len; |
90825b23 JHS |
2228 | act_count = cb->args[1]; |
2229 | memcpy(nla_data(count_attr), &act_count, sizeof(u32)); | |
2230 | cb->args[1] = 0; | |
1da177e4 | 2231 | } else |
ebecaa66 | 2232 | nlmsg_trim(skb, b); |
1da177e4 | 2233 | |
27a884dc | 2234 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
15e47304 | 2235 | if (NETLINK_CB(cb->skb).portid && ret) |
1da177e4 LT |
2236 | nlh->nlmsg_flags |= NLM_F_MULTI; |
2237 | module_put(a_o->owner); | |
2238 | return skb->len; | |
2239 | ||
8b00a53c | 2240 | out_module_put: |
1da177e4 | 2241 | module_put(a_o->owner); |
dc5fc579 | 2242 | nlmsg_trim(skb, b); |
1da177e4 LT |
2243 | return skb->len; |
2244 | } | |
2245 | ||
2246 | static int __init tc_action_init(void) | |
2247 | { | |
b97bac64 FW |
2248 | rtnl_register(PF_UNSPEC, RTM_NEWACTION, tc_ctl_action, NULL, 0); |
2249 | rtnl_register(PF_UNSPEC, RTM_DELACTION, tc_ctl_action, NULL, 0); | |
c7ac8679 | 2250 | rtnl_register(PF_UNSPEC, RTM_GETACTION, tc_ctl_action, tc_dump_action, |
b97bac64 | 2251 | 0); |
1da177e4 | 2252 | |
1da177e4 LT |
2253 | return 0; |
2254 | } | |
2255 | ||
2256 | subsys_initcall(tc_action_init); |