1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* |
3 | * net/sched/act_api.c Packet action API. |
4 | * |
5 | * Author: Jamal Hadi Salim |
6 | */ |
7 | |
8 | #include <linux/types.h> |
9 | #include <linux/kernel.h> |
10 | #include <linux/string.h> |
11 | #include <linux/errno.h> |
12 | #include <linux/slab.h> |
13 | #include <linux/skbuff.h> |
14 | #include <linux/init.h> |
15 | #include <linux/kmod.h> |
16 | #include <linux/err.h> |
17 | #include <linux/module.h> |
18 | #include <net/net_namespace.h> |
19 | #include <net/sock.h> |
20 | #include <net/sch_generic.h> |
21 | #include <net/pkt_cls.h> |
22 | #include <net/tc_act/tc_pedit.h> |
23 | #include <net/act_api.h> |
24 | #include <net/netlink.h> |
25 | #include <net/flow_offload.h> |
26 | #include <net/tc_wrapper.h> |
27 | |
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 | |
44 | static void tcf_action_goto_chain_exec(const struct tc_action *a, |
45 | struct tcf_result *res) |
46 | { |
47 | const struct tcf_chain *chain = rcu_dereference_bh(a->goto_chain); |
48 | |
49 | res->goto_tp = rcu_dereference_bh(chain->filter_chain); |
50 | } |
51 | |
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(objp: cookie->data); |
57 | kfree(objp: 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 | |
65 | old = xchg((__force struct tc_cookie **)old_cookie, new_cookie); |
66 | if (old) |
67 | call_rcu(head: &old->rcu, func: tcf_free_cookie_rcu); |
68 | } |
69 | |
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(block: 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, |
107 | struct tcf_chain *goto_chain) |
108 | { |
109 | a->tcfa_action = action; |
110 | goto_chain = rcu_replace_pointer(a->goto_chain, goto_chain, 1); |
111 | return goto_chain; |
112 | } |
113 | EXPORT_SYMBOL(tcf_action_set_ctrlact); |
114 | |
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) |
121 | { |
122 | struct tcf_chain *chain = rcu_dereference_protected(p->goto_chain, 1); |
123 | |
124 | free_percpu(pdata: p->cpu_bstats); |
125 | free_percpu(pdata: p->cpu_bstats_hw); |
126 | free_percpu(pdata: p->cpu_qstats); |
127 | |
128 | tcf_set_action_cookie(old_cookie: &p->user_cookie, NULL); |
129 | if (chain) |
130 | tcf_chain_put_by_act(chain); |
131 | |
132 | kfree(objp: p); |
133 | } |
134 | |
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 | |
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 | |
154 | static unsigned int tcf_offload_act_num_actions_single(struct tc_action *act) |
155 | { |
156 | if (is_tcf_pedit(a: act)) |
157 | return tcf_pedit_nkeys(a: act); |
158 | else |
159 | return 1; |
160 | } |
161 | |
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 | |
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 | |
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 | { |
185 | int err; |
186 | |
187 | fl_action->extack = extack; |
188 | fl_action->command = cmd; |
189 | fl_action->index = act->tcfa_index; |
190 | fl_action->cookie = (unsigned long)act; |
191 | |
192 | if (act->ops->offload_act_setup) { |
193 | spin_lock_bh(lock: &act->tcfa_lock); |
194 | err = act->ops->offload_act_setup(act, fl_action, NULL, |
195 | false, extack); |
196 | spin_unlock_bh(lock: &act->tcfa_lock); |
197 | return err; |
198 | } |
199 | |
200 | return -EOPNOTSUPP; |
201 | } |
202 | |
203 | static int tcf_action_offload_cmd_ex(struct flow_offload_action *fl_act, |
204 | u32 *hw_count) |
205 | { |
206 | int err; |
207 | |
208 | err = flow_indr_dev_setup_offload(NULL, NULL, type: TC_SETUP_ACT, |
209 | data: fl_act, NULL, NULL); |
210 | if (err < 0) |
211 | return err; |
212 | |
213 | if (hw_count) |
214 | *hw_count = err; |
215 | |
216 | return 0; |
217 | } |
218 | |
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) |
250 | { |
251 | bool skip_sw = tc_act_skip_sw(flags: action->tcfa_flags); |
252 | struct tc_action *actions[TCA_ACT_MAX_PRIO] = { |
253 | [0] = action, |
254 | }; |
255 | struct flow_offload_action *fl_action; |
256 | u32 in_hw_count = 0; |
257 | int num, err = 0; |
258 | |
259 | if (tc_act_skip_hw(flags: action->tcfa_flags)) |
260 | return 0; |
261 | |
262 | num = tcf_offload_act_num_actions_single(act: action); |
263 | fl_action = offload_action_alloc(num_actions: num); |
264 | if (!fl_action) |
265 | return -ENOMEM; |
266 | |
267 | err = offload_action_init(fl_action, act: action, cmd: FLOW_ACT_REPLACE, extack); |
268 | if (err) |
269 | goto fl_err; |
270 | |
271 | err = tc_setup_action(flow_action: &fl_action->action, actions, miss_cookie_base: 0, extack); |
272 | if (err) { |
273 | NL_SET_ERR_MSG_MOD(extack, |
274 | "Failed to setup tc actions for offload" ); |
275 | goto fl_err; |
276 | } |
277 | |
278 | err = tcf_action_offload_cmd(fl_act: fl_action, hw_count: &in_hw_count, cb, cb_priv); |
279 | if (!err) |
280 | cb ? offload_action_hw_count_inc(act: action, hw_count: in_hw_count) : |
281 | offload_action_hw_count_set(act: action, hw_count: in_hw_count); |
282 | |
283 | if (skip_sw && !tc_act_in_hw(act: action)) |
284 | err = -EINVAL; |
285 | |
286 | tc_cleanup_offload_action(flow_action: &fl_action->action); |
287 | |
288 | fl_err: |
289 | kfree(objp: fl_action); |
290 | |
291 | return err; |
292 | } |
293 | |
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 | |
301 | int tcf_action_update_hw_stats(struct tc_action *action) |
302 | { |
303 | struct flow_offload_action fl_act = {}; |
304 | int err; |
305 | |
306 | err = offload_action_init(fl_action: &fl_act, act: action, cmd: FLOW_ACT_STATS, NULL); |
307 | if (err) |
308 | return err; |
309 | |
310 | err = tcf_action_offload_cmd(fl_act: &fl_act, NULL, NULL, NULL); |
311 | if (!err) { |
312 | preempt_disable(); |
313 | tcf_action_stats_update(a: action, bytes: fl_act.stats.bytes, |
314 | packets: fl_act.stats.pkts, |
315 | drops: fl_act.stats.drops, |
316 | lastuse: fl_act.stats.lastused, |
317 | hw: 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 | |
329 | static int tcf_action_offload_del_ex(struct tc_action *action, |
330 | flow_indr_block_bind_cb_t *cb, |
331 | void *cb_priv) |
332 | { |
333 | struct flow_offload_action fl_act = {}; |
334 | u32 in_hw_count = 0; |
335 | int err = 0; |
336 | |
337 | if (!tc_act_in_hw(act: action)) |
338 | return 0; |
339 | |
340 | err = offload_action_init(fl_action: &fl_act, act: action, cmd: FLOW_ACT_DESTROY, NULL); |
341 | if (err) |
342 | return err; |
343 | |
344 | err = tcf_action_offload_cmd(fl_act: &fl_act, hw_count: &in_hw_count, cb, cb_priv); |
345 | if (err < 0) |
346 | return err; |
347 | |
348 | if (!cb && action->in_hw_count != in_hw_count) |
349 | return -EINVAL; |
350 | |
351 | /* do not need to update hw state when deleting action */ |
352 | if (cb && in_hw_count) |
353 | offload_action_hw_count_dec(act: action, hw_count: in_hw_count); |
354 | |
355 | return 0; |
356 | } |
357 | |
358 | static int tcf_action_offload_del(struct tc_action *action) |
359 | { |
360 | return tcf_action_offload_del_ex(action, NULL, NULL); |
361 | } |
362 | |
363 | static void tcf_action_cleanup(struct tc_action *p) |
364 | { |
365 | tcf_action_offload_del(action: p); |
366 | if (p->ops->cleanup) |
367 | p->ops->cleanup(p); |
368 | |
369 | gen_kill_estimator(ptr: &p->tcfa_rate_est); |
370 | free_tcf(p); |
371 | } |
372 | |
373 | static int __tcf_action_put(struct tc_action *p, bool bind) |
374 | { |
375 | struct tcf_idrinfo *idrinfo = p->idrinfo; |
376 | |
377 | if (refcount_dec_and_mutex_lock(r: &p->tcfa_refcnt, lock: &idrinfo->lock)) { |
378 | if (bind) |
379 | atomic_dec(v: &p->tcfa_bindcnt); |
380 | idr_remove(&idrinfo->action_idr, id: p->tcfa_index); |
381 | mutex_unlock(lock: &idrinfo->lock); |
382 | |
383 | tcf_action_cleanup(p); |
384 | return 1; |
385 | } |
386 | |
387 | if (bind) |
388 | atomic_dec(v: &p->tcfa_bindcnt); |
389 | |
390 | return 0; |
391 | } |
392 | |
393 | static int __tcf_idr_release(struct tc_action *p, bool bind, bool strict) |
394 | { |
395 | int ret = 0; |
396 | |
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 | */ |
409 | if (p) { |
410 | if (!bind && strict && atomic_read(v: &p->tcfa_bindcnt) > 0) |
411 | return -EPERM; |
412 | |
413 | if (__tcf_action_put(p, bind)) |
414 | ret = ACT_P_DELETED; |
415 | } |
416 | |
417 | return ret; |
418 | } |
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(p: a, bind, strict: false); |
426 | if (ret == ACT_P_DELETED) |
427 | module_put(module: ops->owner); |
428 | return ret; |
429 | } |
430 | EXPORT_SYMBOL(tcf_idr_release); |
431 | |
432 | static size_t tcf_action_shared_attrs_size(const struct tc_action *act) |
433 | { |
434 | struct tc_cookie *user_cookie; |
435 | u32 cookie_len = 0; |
436 | |
437 | rcu_read_lock(); |
438 | user_cookie = rcu_dereference(act->user_cookie); |
439 | |
440 | if (user_cookie) |
441 | cookie_len = nla_total_size(payload: user_cookie->len); |
442 | rcu_read_unlock(); |
443 | |
444 | return nla_total_size(payload: 0) /* action number nested */ |
445 | + nla_total_size(IFNAMSIZ) /* TCA_ACT_KIND */ |
446 | + cookie_len /* TCA_ACT_COOKIE */ |
447 | + nla_total_size(payload: sizeof(struct nla_bitfield32)) /* TCA_ACT_HW_STATS */ |
448 | + nla_total_size(payload: 0) /* TCA_ACT_STATS nested */ |
449 | + nla_total_size(payload: sizeof(struct nla_bitfield32)) /* TCA_ACT_FLAGS */ |
450 | /* TCA_STATS_BASIC */ |
451 | + nla_total_size_64bit(payload: sizeof(struct gnet_stats_basic)) |
452 | /* TCA_STATS_PKT64 */ |
453 | + nla_total_size_64bit(payload: sizeof(u64)) |
454 | /* TCA_STATS_QUEUE */ |
455 | + nla_total_size_64bit(payload: sizeof(struct gnet_stats_queue)) |
456 | + nla_total_size(payload: 0) /* TCA_ACT_OPTIONS nested */ |
457 | + nla_total_size(payload: 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(payload: 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 | |
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 | |
483 | if (nla_put_string(skb, attrtype: TCA_ACT_KIND, str: a->ops->kind)) |
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, attrtype: TCA_ACT_INDEX, value: a->tcfa_index)) |
488 | goto nla_put_failure; |
489 | |
490 | rcu_read_lock(); |
491 | cookie = rcu_dereference(a->user_cookie); |
492 | if (cookie) { |
493 | if (nla_put(skb, attrtype: TCA_ACT_COOKIE, attrlen: cookie->len, data: 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, mark: b); |
504 | return -1; |
505 | } |
506 | |
507 | static int tcf_dump_walker(struct tcf_idrinfo *idrinfo, struct sk_buff *skb, |
508 | struct netlink_callback *cb) |
509 | { |
510 | int err = 0, index = -1, s_i = 0, n_i = 0; |
511 | u32 act_flags = cb->args[2]; |
512 | unsigned long jiffy_since = cb->args[3]; |
513 | struct nlattr *nest; |
514 | struct idr *idr = &idrinfo->action_idr; |
515 | struct tc_action *p; |
516 | unsigned long id = 1; |
517 | unsigned long tmp; |
518 | |
519 | mutex_lock(&idrinfo->lock); |
520 | |
521 | s_i = cb->args[0]; |
522 | |
523 | idr_for_each_entry_ul(idr, p, tmp, id) { |
524 | index++; |
525 | if (index < s_i) |
526 | continue; |
527 | if (IS_ERR(ptr: p)) |
528 | continue; |
529 | |
530 | if (jiffy_since && |
531 | time_after(jiffy_since, |
532 | (unsigned long)p->tcfa_tm.lastuse)) |
533 | continue; |
534 | |
535 | tcf_action_update_hw_stats(p); |
536 | |
537 | nest = nla_nest_start_noflag(skb, attrtype: n_i); |
538 | if (!nest) { |
539 | index--; |
540 | goto nla_put_failure; |
541 | } |
542 | err = (act_flags & TCA_ACT_FLAG_TERSE_DUMP) ? |
543 | tcf_action_dump_terse(skb, a: p, from_act: true) : |
544 | tcf_action_dump_1(skb, a: p, 0, 0); |
545 | if (err < 0) { |
546 | index--; |
547 | nlmsg_trim(skb, mark: nest); |
548 | goto done; |
549 | } |
550 | nla_nest_end(skb, start: nest); |
551 | n_i++; |
552 | if (!(act_flags & TCA_ACT_FLAG_LARGE_DUMP_ON) && |
553 | n_i >= TCA_ACT_MAX_PRIO) |
554 | goto done; |
555 | } |
556 | done: |
557 | if (index >= 0) |
558 | cb->args[0] = index + 1; |
559 | |
560 | mutex_unlock(lock: &idrinfo->lock); |
561 | if (n_i) { |
562 | if (act_flags & TCA_ACT_FLAG_LARGE_DUMP_ON) |
563 | cb->args[1] = n_i; |
564 | } |
565 | return n_i; |
566 | |
567 | nla_put_failure: |
568 | nla_nest_cancel(skb, start: nest); |
569 | goto done; |
570 | } |
571 | |
572 | static int tcf_idr_release_unsafe(struct tc_action *p) |
573 | { |
574 | if (atomic_read(v: &p->tcfa_bindcnt) > 0) |
575 | return -EPERM; |
576 | |
577 | if (refcount_dec_and_test(r: &p->tcfa_refcnt)) { |
578 | idr_remove(&p->idrinfo->action_idr, id: p->tcfa_index); |
579 | tcf_action_cleanup(p); |
580 | return ACT_P_DELETED; |
581 | } |
582 | |
583 | return 0; |
584 | } |
585 | |
586 | static int tcf_del_walker(struct tcf_idrinfo *idrinfo, struct sk_buff *skb, |
587 | const struct tc_action_ops *ops, |
588 | struct netlink_ext_ack *extack) |
589 | { |
590 | struct nlattr *nest; |
591 | int n_i = 0; |
592 | int ret = -EINVAL; |
593 | struct idr *idr = &idrinfo->action_idr; |
594 | struct tc_action *p; |
595 | unsigned long id = 1; |
596 | unsigned long tmp; |
597 | |
598 | nest = nla_nest_start_noflag(skb, attrtype: 0); |
599 | if (nest == NULL) |
600 | goto nla_put_failure; |
601 | if (nla_put_string(skb, attrtype: TCA_ACT_KIND, str: ops->kind)) |
602 | goto nla_put_failure; |
603 | |
604 | ret = 0; |
605 | mutex_lock(&idrinfo->lock); |
606 | idr_for_each_entry_ul(idr, p, tmp, id) { |
607 | if (IS_ERR(ptr: p)) |
608 | continue; |
609 | ret = tcf_idr_release_unsafe(p); |
610 | if (ret == ACT_P_DELETED) |
611 | module_put(module: ops->owner); |
612 | else if (ret < 0) |
613 | break; |
614 | n_i++; |
615 | } |
616 | mutex_unlock(lock: &idrinfo->lock); |
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 | } |
623 | |
624 | ret = nla_put_u32(skb, attrtype: TCA_FCNT, value: n_i); |
625 | if (ret) |
626 | goto nla_put_failure; |
627 | nla_nest_end(skb, start: nest); |
628 | |
629 | return n_i; |
630 | nla_put_failure: |
631 | nla_nest_cancel(skb, start: nest); |
632 | return ret; |
633 | } |
634 | |
635 | int tcf_generic_walker(struct tc_action_net *tn, struct sk_buff *skb, |
636 | struct netlink_callback *cb, int type, |
637 | const struct tc_action_ops *ops, |
638 | struct netlink_ext_ack *extack) |
639 | { |
640 | struct tcf_idrinfo *idrinfo = tn->idrinfo; |
641 | |
642 | if (type == RTM_DELACTION) { |
643 | return tcf_del_walker(idrinfo, skb, ops, extack); |
644 | } else if (type == RTM_GETACTION) { |
645 | return tcf_dump_walker(idrinfo, skb, cb); |
646 | } else { |
647 | WARN(1, "tcf_generic_walker: unknown command %d\n" , type); |
648 | NL_SET_ERR_MSG(extack, "tcf_generic_walker: unknown command" ); |
649 | return -EINVAL; |
650 | } |
651 | } |
652 | EXPORT_SYMBOL(tcf_generic_walker); |
653 | |
654 | int tcf_idr_search(struct tc_action_net *tn, struct tc_action **a, u32 index) |
655 | { |
656 | struct tcf_idrinfo *idrinfo = tn->idrinfo; |
657 | struct tc_action *p; |
658 | |
659 | mutex_lock(&idrinfo->lock); |
660 | p = idr_find(&idrinfo->action_idr, id: index); |
661 | if (IS_ERR(ptr: p)) |
662 | p = NULL; |
663 | else if (p) |
664 | refcount_inc(r: &p->tcfa_refcnt); |
665 | mutex_unlock(lock: &idrinfo->lock); |
666 | |
667 | if (p) { |
668 | *a = p; |
669 | return true; |
670 | } |
671 | return false; |
672 | } |
673 | EXPORT_SYMBOL(tcf_idr_search); |
674 | |
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, id: 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, id: 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 | |
700 | static int tcf_idr_delete_index(struct tcf_idrinfo *idrinfo, u32 index) |
701 | { |
702 | struct tc_action *p; |
703 | int ret = 0; |
704 | |
705 | mutex_lock(&idrinfo->lock); |
706 | p = idr_find(&idrinfo->action_idr, id: index); |
707 | if (!p) { |
708 | mutex_unlock(lock: &idrinfo->lock); |
709 | return -ENOENT; |
710 | } |
711 | |
712 | if (!atomic_read(v: &p->tcfa_bindcnt)) { |
713 | if (refcount_dec_and_test(r: &p->tcfa_refcnt)) { |
714 | struct module *owner = p->ops->owner; |
715 | |
716 | WARN_ON(p != idr_remove(&idrinfo->action_idr, |
717 | p->tcfa_index)); |
718 | mutex_unlock(lock: &idrinfo->lock); |
719 | |
720 | tcf_action_cleanup(p); |
721 | module_put(module: owner); |
722 | return 0; |
723 | } |
724 | ret = 0; |
725 | } else { |
726 | ret = -EPERM; |
727 | } |
728 | |
729 | mutex_unlock(lock: &idrinfo->lock); |
730 | return ret; |
731 | } |
732 | |
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, |
735 | int bind, bool cpustats, u32 flags) |
736 | { |
737 | struct tc_action *p = kzalloc(size: ops->size, GFP_KERNEL); |
738 | struct tcf_idrinfo *idrinfo = tn->idrinfo; |
739 | int err = -ENOMEM; |
740 | |
741 | if (unlikely(!p)) |
742 | return -ENOMEM; |
743 | refcount_set(r: &p->tcfa_refcnt, n: 1); |
744 | if (bind) |
745 | atomic_set(v: &p->tcfa_bindcnt, i: 1); |
746 | |
747 | if (cpustats) { |
748 | p->cpu_bstats = netdev_alloc_pcpu_stats(struct gnet_stats_basic_sync); |
749 | if (!p->cpu_bstats) |
750 | goto err1; |
751 | p->cpu_bstats_hw = netdev_alloc_pcpu_stats(struct gnet_stats_basic_sync); |
752 | if (!p->cpu_bstats_hw) |
753 | goto err2; |
754 | p->cpu_qstats = alloc_percpu(struct gnet_stats_queue); |
755 | if (!p->cpu_qstats) |
756 | goto err3; |
757 | } |
758 | gnet_stats_basic_sync_init(b: &p->tcfa_bstats); |
759 | gnet_stats_basic_sync_init(b: &p->tcfa_bstats_hw); |
760 | spin_lock_init(&p->tcfa_lock); |
761 | p->tcfa_index = index; |
762 | p->tcfa_tm.install = jiffies; |
763 | p->tcfa_tm.lastuse = jiffies; |
764 | p->tcfa_tm.firstuse = 0; |
765 | p->tcfa_flags = flags; |
766 | if (est) { |
767 | err = gen_new_estimator(bstats: &p->tcfa_bstats, cpu_bstats: p->cpu_bstats, |
768 | rate_est: &p->tcfa_rate_est, |
769 | lock: &p->tcfa_lock, running: false, opt: est); |
770 | if (err) |
771 | goto err4; |
772 | } |
773 | |
774 | p->idrinfo = idrinfo; |
775 | __module_get(module: ops->owner); |
776 | p->ops = ops; |
777 | *a = p; |
778 | return 0; |
779 | err4: |
780 | free_percpu(pdata: p->cpu_qstats); |
781 | err3: |
782 | free_percpu(pdata: p->cpu_bstats_hw); |
783 | err2: |
784 | free_percpu(pdata: p->cpu_bstats); |
785 | err1: |
786 | kfree(objp: p); |
787 | return err; |
788 | } |
789 | EXPORT_SYMBOL(tcf_idr_create); |
790 | |
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 | |
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 | |
808 | mutex_lock(&idrinfo->lock); |
809 | /* Remove ERR_PTR(-EBUSY) allocated by tcf_idr_check_alloc */ |
810 | WARN_ON(!IS_ERR(idr_remove(&idrinfo->action_idr, index))); |
811 | mutex_unlock(lock: &idrinfo->lock); |
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. |
819 | */ |
820 | |
821 | int tcf_idr_check_alloc(struct tc_action_net *tn, u32 *index, |
822 | struct tc_action **a, int bind) |
823 | { |
824 | struct tcf_idrinfo *idrinfo = tn->idrinfo; |
825 | struct tc_action *p; |
826 | int ret; |
827 | |
828 | again: |
829 | mutex_lock(&idrinfo->lock); |
830 | if (*index) { |
831 | p = idr_find(&idrinfo->action_idr, id: *index); |
832 | if (IS_ERR(ptr: p)) { |
833 | /* This means that another process allocated |
834 | * index but did not assign the pointer yet. |
835 | */ |
836 | mutex_unlock(lock: &idrinfo->lock); |
837 | goto again; |
838 | } |
839 | |
840 | if (p) { |
841 | refcount_inc(r: &p->tcfa_refcnt); |
842 | if (bind) |
843 | atomic_inc(v: &p->tcfa_bindcnt); |
844 | *a = p; |
845 | ret = 1; |
846 | } else { |
847 | *a = NULL; |
848 | ret = idr_alloc_u32(&idrinfo->action_idr, NULL, id: index, |
849 | max: *index, GFP_KERNEL); |
850 | if (!ret) |
851 | idr_replace(&idrinfo->action_idr, |
852 | ERR_PTR(error: -EBUSY), id: *index); |
853 | } |
854 | } else { |
855 | *index = 1; |
856 | *a = NULL; |
857 | ret = idr_alloc_u32(&idrinfo->action_idr, NULL, id: index, |
858 | UINT_MAX, GFP_KERNEL); |
859 | if (!ret) |
860 | idr_replace(&idrinfo->action_idr, ERR_PTR(error: -EBUSY), |
861 | id: *index); |
862 | } |
863 | mutex_unlock(lock: &idrinfo->lock); |
864 | return ret; |
865 | } |
866 | EXPORT_SYMBOL(tcf_idr_check_alloc); |
867 | |
868 | void tcf_idrinfo_destroy(const struct tc_action_ops *ops, |
869 | struct tcf_idrinfo *idrinfo) |
870 | { |
871 | struct idr *idr = &idrinfo->action_idr; |
872 | struct tc_action *p; |
873 | int ret; |
874 | unsigned long id = 1; |
875 | unsigned long tmp; |
876 | |
877 | idr_for_each_entry_ul(idr, p, tmp, id) { |
878 | ret = __tcf_idr_release(p, bind: false, strict: true); |
879 | if (ret == ACT_P_DELETED) |
880 | module_put(module: ops->owner); |
881 | else if (ret < 0) |
882 | return; |
883 | } |
884 | idr_destroy(&idrinfo->action_idr); |
885 | } |
886 | EXPORT_SYMBOL(tcf_idrinfo_destroy); |
887 | |
888 | static LIST_HEAD(act_base); |
889 | static DEFINE_RWLOCK(act_mod_lock); |
890 | /* since act ops id is stored in pernet subsystem list, |
891 | * then there is no way to walk through only all the action |
892 | * subsystem, so we keep tc action pernet ops id for |
893 | * reoffload to walk through. |
894 | */ |
895 | static LIST_HEAD(act_pernet_id_list); |
896 | static DEFINE_MUTEX(act_id_mutex); |
897 | struct tc_act_pernet_id { |
898 | struct list_head list; |
899 | unsigned int id; |
900 | }; |
901 | |
902 | static int tcf_pernet_add_id_list(unsigned int id) |
903 | { |
904 | struct tc_act_pernet_id *id_ptr; |
905 | int ret = 0; |
906 | |
907 | mutex_lock(&act_id_mutex); |
908 | list_for_each_entry(id_ptr, &act_pernet_id_list, list) { |
909 | if (id_ptr->id == id) { |
910 | ret = -EEXIST; |
911 | goto err_out; |
912 | } |
913 | } |
914 | |
915 | id_ptr = kzalloc(size: sizeof(*id_ptr), GFP_KERNEL); |
916 | if (!id_ptr) { |
917 | ret = -ENOMEM; |
918 | goto err_out; |
919 | } |
920 | id_ptr->id = id; |
921 | |
922 | list_add_tail(new: &id_ptr->list, head: &act_pernet_id_list); |
923 | |
924 | err_out: |
925 | mutex_unlock(lock: &act_id_mutex); |
926 | return ret; |
927 | } |
928 | |
929 | static void tcf_pernet_del_id_list(unsigned int id) |
930 | { |
931 | struct tc_act_pernet_id *id_ptr; |
932 | |
933 | mutex_lock(&act_id_mutex); |
934 | list_for_each_entry(id_ptr, &act_pernet_id_list, list) { |
935 | if (id_ptr->id == id) { |
936 | list_del(entry: &id_ptr->list); |
937 | kfree(objp: id_ptr); |
938 | break; |
939 | } |
940 | } |
941 | mutex_unlock(lock: &act_id_mutex); |
942 | } |
943 | |
944 | int tcf_register_action(struct tc_action_ops *act, |
945 | struct pernet_operations *ops) |
946 | { |
947 | struct tc_action_ops *a; |
948 | int ret; |
949 | |
950 | if (!act->act || !act->dump || !act->init) |
951 | return -EINVAL; |
952 | |
953 | /* We have to register pernet ops before making the action ops visible, |
954 | * otherwise tcf_action_init_1() could get a partially initialized |
955 | * netns. |
956 | */ |
957 | ret = register_pernet_subsys(ops); |
958 | if (ret) |
959 | return ret; |
960 | |
961 | if (ops->id) { |
962 | ret = tcf_pernet_add_id_list(id: *ops->id); |
963 | if (ret) |
964 | goto err_id; |
965 | } |
966 | |
967 | write_lock(&act_mod_lock); |
968 | list_for_each_entry(a, &act_base, head) { |
969 | if (act->id == a->id || (strcmp(act->kind, a->kind) == 0)) { |
970 | ret = -EEXIST; |
971 | goto err_out; |
972 | } |
973 | } |
974 | list_add_tail(new: &act->head, head: &act_base); |
975 | write_unlock(&act_mod_lock); |
976 | |
977 | return 0; |
978 | |
979 | err_out: |
980 | write_unlock(&act_mod_lock); |
981 | if (ops->id) |
982 | tcf_pernet_del_id_list(id: *ops->id); |
983 | err_id: |
984 | unregister_pernet_subsys(ops); |
985 | return ret; |
986 | } |
987 | EXPORT_SYMBOL(tcf_register_action); |
988 | |
989 | int tcf_unregister_action(struct tc_action_ops *act, |
990 | struct pernet_operations *ops) |
991 | { |
992 | struct tc_action_ops *a; |
993 | int err = -ENOENT; |
994 | |
995 | write_lock(&act_mod_lock); |
996 | list_for_each_entry(a, &act_base, head) { |
997 | if (a == act) { |
998 | list_del(entry: &act->head); |
999 | err = 0; |
1000 | break; |
1001 | } |
1002 | } |
1003 | write_unlock(&act_mod_lock); |
1004 | if (!err) { |
1005 | unregister_pernet_subsys(ops); |
1006 | if (ops->id) |
1007 | tcf_pernet_del_id_list(id: *ops->id); |
1008 | } |
1009 | return err; |
1010 | } |
1011 | EXPORT_SYMBOL(tcf_unregister_action); |
1012 | |
1013 | /* lookup by name */ |
1014 | static struct tc_action_ops *tc_lookup_action_n(char *kind) |
1015 | { |
1016 | struct tc_action_ops *a, *res = NULL; |
1017 | |
1018 | if (kind) { |
1019 | read_lock(&act_mod_lock); |
1020 | list_for_each_entry(a, &act_base, head) { |
1021 | if (strcmp(kind, a->kind) == 0) { |
1022 | if (try_module_get(module: a->owner)) |
1023 | res = a; |
1024 | break; |
1025 | } |
1026 | } |
1027 | read_unlock(&act_mod_lock); |
1028 | } |
1029 | return res; |
1030 | } |
1031 | |
1032 | /* lookup by nlattr */ |
1033 | static struct tc_action_ops *tc_lookup_action(struct nlattr *kind) |
1034 | { |
1035 | struct tc_action_ops *a, *res = NULL; |
1036 | |
1037 | if (kind) { |
1038 | read_lock(&act_mod_lock); |
1039 | list_for_each_entry(a, &act_base, head) { |
1040 | if (nla_strcmp(nla: kind, str: a->kind) == 0) { |
1041 | if (try_module_get(module: a->owner)) |
1042 | res = a; |
1043 | break; |
1044 | } |
1045 | } |
1046 | read_unlock(&act_mod_lock); |
1047 | } |
1048 | return res; |
1049 | } |
1050 | |
1051 | /*TCA_ACT_MAX_PRIO is 32, there count up to 32 */ |
1052 | #define TCA_ACT_MAX_PRIO_MASK 0x1FF |
1053 | int tcf_action_exec(struct sk_buff *skb, struct tc_action **actions, |
1054 | int nr_actions, struct tcf_result *res) |
1055 | { |
1056 | u32 jmp_prgcnt = 0; |
1057 | u32 jmp_ttl = TCA_ACT_MAX_PRIO; /*matches actions per filter */ |
1058 | int i; |
1059 | int ret = TC_ACT_OK; |
1060 | |
1061 | if (skb_skip_tc_classify(skb)) |
1062 | return TC_ACT_OK; |
1063 | |
1064 | restart_act_graph: |
1065 | for (i = 0; i < nr_actions; i++) { |
1066 | const struct tc_action *a = actions[i]; |
1067 | int repeat_ttl; |
1068 | |
1069 | if (jmp_prgcnt > 0) { |
1070 | jmp_prgcnt -= 1; |
1071 | continue; |
1072 | } |
1073 | |
1074 | if (tc_act_skip_sw(flags: a->tcfa_flags)) |
1075 | continue; |
1076 | |
1077 | repeat_ttl = 32; |
1078 | repeat: |
1079 | ret = tc_act(skb, a, res); |
1080 | if (unlikely(ret == TC_ACT_REPEAT)) { |
1081 | if (--repeat_ttl != 0) |
1082 | goto repeat; |
1083 | /* suspicious opcode, stop pipeline */ |
1084 | net_warn_ratelimited("TC_ACT_REPEAT abuse ?\n" ); |
1085 | return TC_ACT_OK; |
1086 | } |
1087 | if (TC_ACT_EXT_CMP(ret, TC_ACT_JUMP)) { |
1088 | jmp_prgcnt = ret & TCA_ACT_MAX_PRIO_MASK; |
1089 | if (!jmp_prgcnt || (jmp_prgcnt > nr_actions)) { |
1090 | /* faulty opcode, stop pipeline */ |
1091 | return TC_ACT_OK; |
1092 | } else { |
1093 | jmp_ttl -= 1; |
1094 | if (jmp_ttl > 0) |
1095 | goto restart_act_graph; |
1096 | else /* faulty graph, stop pipeline */ |
1097 | return TC_ACT_OK; |
1098 | } |
1099 | } else if (TC_ACT_EXT_CMP(ret, TC_ACT_GOTO_CHAIN)) { |
1100 | if (unlikely(!rcu_access_pointer(a->goto_chain))) { |
1101 | net_warn_ratelimited("can't go to NULL chain!\n" ); |
1102 | return TC_ACT_SHOT; |
1103 | } |
1104 | tcf_action_goto_chain_exec(a, res); |
1105 | } |
1106 | |
1107 | if (ret != TC_ACT_PIPE) |
1108 | break; |
1109 | } |
1110 | |
1111 | return ret; |
1112 | } |
1113 | EXPORT_SYMBOL(tcf_action_exec); |
1114 | |
1115 | int tcf_action_destroy(struct tc_action *actions[], int bind) |
1116 | { |
1117 | const struct tc_action_ops *ops; |
1118 | struct tc_action *a; |
1119 | int ret = 0, i; |
1120 | |
1121 | for (i = 0; i < TCA_ACT_MAX_PRIO && actions[i]; i++) { |
1122 | a = actions[i]; |
1123 | actions[i] = NULL; |
1124 | ops = a->ops; |
1125 | ret = __tcf_idr_release(p: a, bind, strict: true); |
1126 | if (ret == ACT_P_DELETED) |
1127 | module_put(module: ops->owner); |
1128 | else if (ret < 0) |
1129 | return ret; |
1130 | } |
1131 | return ret; |
1132 | } |
1133 | |
1134 | static int tcf_action_put(struct tc_action *p) |
1135 | { |
1136 | return __tcf_action_put(p, bind: false); |
1137 | } |
1138 | |
1139 | /* Put all actions in this array, skip those NULL's. */ |
1140 | static void tcf_action_put_many(struct tc_action *actions[]) |
1141 | { |
1142 | int i; |
1143 | |
1144 | for (i = 0; i < TCA_ACT_MAX_PRIO; i++) { |
1145 | struct tc_action *a = actions[i]; |
1146 | const struct tc_action_ops *ops; |
1147 | |
1148 | if (!a) |
1149 | continue; |
1150 | ops = a->ops; |
1151 | if (tcf_action_put(p: a)) |
1152 | module_put(module: ops->owner); |
1153 | } |
1154 | } |
1155 | |
1156 | int |
1157 | tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int bind, int ref) |
1158 | { |
1159 | return a->ops->dump(skb, a, bind, ref); |
1160 | } |
1161 | |
1162 | int |
1163 | tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int bind, int ref) |
1164 | { |
1165 | int err = -EINVAL; |
1166 | unsigned char *b = skb_tail_pointer(skb); |
1167 | struct nlattr *nest; |
1168 | u32 flags; |
1169 | |
1170 | if (tcf_action_dump_terse(skb, a, from_act: false)) |
1171 | goto nla_put_failure; |
1172 | |
1173 | if (a->hw_stats != TCA_ACT_HW_STATS_ANY && |
1174 | nla_put_bitfield32(skb, attrtype: TCA_ACT_HW_STATS, |
1175 | value: a->hw_stats, TCA_ACT_HW_STATS_ANY)) |
1176 | goto nla_put_failure; |
1177 | |
1178 | if (a->used_hw_stats_valid && |
1179 | nla_put_bitfield32(skb, attrtype: TCA_ACT_USED_HW_STATS, |
1180 | value: a->used_hw_stats, TCA_ACT_HW_STATS_ANY)) |
1181 | goto nla_put_failure; |
1182 | |
1183 | flags = a->tcfa_flags & TCA_ACT_FLAGS_USER_MASK; |
1184 | if (flags && |
1185 | nla_put_bitfield32(skb, attrtype: TCA_ACT_FLAGS, |
1186 | value: flags, selector: flags)) |
1187 | goto nla_put_failure; |
1188 | |
1189 | if (nla_put_u32(skb, attrtype: TCA_ACT_IN_HW_COUNT, value: a->in_hw_count)) |
1190 | goto nla_put_failure; |
1191 | |
1192 | nest = nla_nest_start_noflag(skb, attrtype: TCA_ACT_OPTIONS); |
1193 | if (nest == NULL) |
1194 | goto nla_put_failure; |
1195 | err = tcf_action_dump_old(skb, a, bind, ref); |
1196 | if (err > 0) { |
1197 | nla_nest_end(skb, start: nest); |
1198 | return err; |
1199 | } |
1200 | |
1201 | nla_put_failure: |
1202 | nlmsg_trim(skb, mark: b); |
1203 | return -1; |
1204 | } |
1205 | EXPORT_SYMBOL(tcf_action_dump_1); |
1206 | |
1207 | int tcf_action_dump(struct sk_buff *skb, struct tc_action *actions[], |
1208 | int bind, int ref, bool terse) |
1209 | { |
1210 | struct tc_action *a; |
1211 | int err = -EINVAL, i; |
1212 | struct nlattr *nest; |
1213 | |
1214 | for (i = 0; i < TCA_ACT_MAX_PRIO && actions[i]; i++) { |
1215 | a = actions[i]; |
1216 | nest = nla_nest_start_noflag(skb, attrtype: i + 1); |
1217 | if (nest == NULL) |
1218 | goto nla_put_failure; |
1219 | err = terse ? tcf_action_dump_terse(skb, a, from_act: false) : |
1220 | tcf_action_dump_1(skb, a, bind, ref); |
1221 | if (err < 0) |
1222 | goto errout; |
1223 | nla_nest_end(skb, start: nest); |
1224 | } |
1225 | |
1226 | return 0; |
1227 | |
1228 | nla_put_failure: |
1229 | err = -EINVAL; |
1230 | errout: |
1231 | nla_nest_cancel(skb, start: nest); |
1232 | return err; |
1233 | } |
1234 | |
1235 | static struct tc_cookie *nla_memdup_cookie(struct nlattr **tb) |
1236 | { |
1237 | struct tc_cookie *c = kzalloc(size: sizeof(*c), GFP_KERNEL); |
1238 | if (!c) |
1239 | return NULL; |
1240 | |
1241 | c->data = nla_memdup(src: tb[TCA_ACT_COOKIE], GFP_KERNEL); |
1242 | if (!c->data) { |
1243 | kfree(objp: c); |
1244 | return NULL; |
1245 | } |
1246 | c->len = nla_len(nla: tb[TCA_ACT_COOKIE]); |
1247 | |
1248 | return c; |
1249 | } |
1250 | |
1251 | static u8 tcf_action_hw_stats_get(struct nlattr *hw_stats_attr) |
1252 | { |
1253 | struct nla_bitfield32 hw_stats_bf; |
1254 | |
1255 | /* If the user did not pass the attr, that means he does |
1256 | * not care about the type. Return "any" in that case |
1257 | * which is setting on all supported types. |
1258 | */ |
1259 | if (!hw_stats_attr) |
1260 | return TCA_ACT_HW_STATS_ANY; |
1261 | hw_stats_bf = nla_get_bitfield32(nla: hw_stats_attr); |
1262 | return hw_stats_bf.value; |
1263 | } |
1264 | |
1265 | static const struct nla_policy tcf_action_policy[TCA_ACT_MAX + 1] = { |
1266 | [TCA_ACT_KIND] = { .type = NLA_STRING }, |
1267 | [TCA_ACT_INDEX] = { .type = NLA_U32 }, |
1268 | [TCA_ACT_COOKIE] = { .type = NLA_BINARY, |
1269 | .len = TC_COOKIE_MAX_SIZE }, |
1270 | [TCA_ACT_OPTIONS] = { .type = NLA_NESTED }, |
1271 | [TCA_ACT_FLAGS] = NLA_POLICY_BITFIELD32(TCA_ACT_FLAGS_NO_PERCPU_STATS | |
1272 | TCA_ACT_FLAGS_SKIP_HW | |
1273 | TCA_ACT_FLAGS_SKIP_SW), |
1274 | [TCA_ACT_HW_STATS] = NLA_POLICY_BITFIELD32(TCA_ACT_HW_STATS_ANY), |
1275 | }; |
1276 | |
1277 | void tcf_idr_insert_many(struct tc_action *actions[]) |
1278 | { |
1279 | int i; |
1280 | |
1281 | for (i = 0; i < TCA_ACT_MAX_PRIO; i++) { |
1282 | struct tc_action *a = actions[i]; |
1283 | struct tcf_idrinfo *idrinfo; |
1284 | |
1285 | if (!a) |
1286 | continue; |
1287 | idrinfo = a->idrinfo; |
1288 | mutex_lock(&idrinfo->lock); |
1289 | /* Replace ERR_PTR(-EBUSY) allocated by tcf_idr_check_alloc if |
1290 | * it is just created, otherwise this is just a nop. |
1291 | */ |
1292 | idr_replace(&idrinfo->action_idr, a, id: a->tcfa_index); |
1293 | mutex_unlock(lock: &idrinfo->lock); |
1294 | } |
1295 | } |
1296 | |
1297 | struct tc_action_ops *tc_action_load_ops(struct nlattr *nla, bool police, |
1298 | bool rtnl_held, |
1299 | struct netlink_ext_ack *extack) |
1300 | { |
1301 | struct nlattr *tb[TCA_ACT_MAX + 1]; |
1302 | struct tc_action_ops *a_o; |
1303 | char act_name[IFNAMSIZ]; |
1304 | struct nlattr *kind; |
1305 | int err; |
1306 | |
1307 | if (!police) { |
1308 | err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla, |
1309 | policy: tcf_action_policy, extack); |
1310 | if (err < 0) |
1311 | return ERR_PTR(error: err); |
1312 | err = -EINVAL; |
1313 | kind = tb[TCA_ACT_KIND]; |
1314 | if (!kind) { |
1315 | NL_SET_ERR_MSG(extack, "TC action kind must be specified" ); |
1316 | return ERR_PTR(error: err); |
1317 | } |
1318 | if (nla_strscpy(dst: act_name, nla: kind, IFNAMSIZ) < 0) { |
1319 | NL_SET_ERR_MSG(extack, "TC action name too long" ); |
1320 | return ERR_PTR(error: err); |
1321 | } |
1322 | } else { |
1323 | if (strscpy(p: act_name, q: "police" , IFNAMSIZ) < 0) { |
1324 | NL_SET_ERR_MSG(extack, "TC action name too long" ); |
1325 | return ERR_PTR(error: -EINVAL); |
1326 | } |
1327 | } |
1328 | |
1329 | a_o = tc_lookup_action_n(kind: act_name); |
1330 | if (a_o == NULL) { |
1331 | #ifdef CONFIG_MODULES |
1332 | if (rtnl_held) |
1333 | rtnl_unlock(); |
1334 | request_module("act_%s" , act_name); |
1335 | if (rtnl_held) |
1336 | rtnl_lock(); |
1337 | |
1338 | a_o = tc_lookup_action_n(kind: act_name); |
1339 | |
1340 | /* We dropped the RTNL semaphore in order to |
1341 | * perform the module load. So, even if we |
1342 | * succeeded in loading the module we have to |
1343 | * tell the caller to replay the request. We |
1344 | * indicate this using -EAGAIN. |
1345 | */ |
1346 | if (a_o != NULL) { |
1347 | module_put(module: a_o->owner); |
1348 | return ERR_PTR(error: -EAGAIN); |
1349 | } |
1350 | #endif |
1351 | NL_SET_ERR_MSG(extack, "Failed to load TC action module" ); |
1352 | return ERR_PTR(error: -ENOENT); |
1353 | } |
1354 | |
1355 | return a_o; |
1356 | } |
1357 | |
1358 | struct tc_action *tcf_action_init_1(struct net *net, struct tcf_proto *tp, |
1359 | struct nlattr *nla, struct nlattr *est, |
1360 | struct tc_action_ops *a_o, int *init_res, |
1361 | u32 flags, struct netlink_ext_ack *extack) |
1362 | { |
1363 | bool police = flags & TCA_ACT_FLAGS_POLICE; |
1364 | struct nla_bitfield32 userflags = { 0, 0 }; |
1365 | struct tc_cookie *user_cookie = NULL; |
1366 | u8 hw_stats = TCA_ACT_HW_STATS_ANY; |
1367 | struct nlattr *tb[TCA_ACT_MAX + 1]; |
1368 | struct tc_action *a; |
1369 | int err; |
1370 | |
1371 | /* backward compatibility for policer */ |
1372 | if (!police) { |
1373 | err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla, |
1374 | policy: tcf_action_policy, extack); |
1375 | if (err < 0) |
1376 | return ERR_PTR(error: err); |
1377 | if (tb[TCA_ACT_COOKIE]) { |
1378 | user_cookie = nla_memdup_cookie(tb); |
1379 | if (!user_cookie) { |
1380 | NL_SET_ERR_MSG(extack, "No memory to generate TC cookie" ); |
1381 | err = -ENOMEM; |
1382 | goto err_out; |
1383 | } |
1384 | } |
1385 | hw_stats = tcf_action_hw_stats_get(hw_stats_attr: tb[TCA_ACT_HW_STATS]); |
1386 | if (tb[TCA_ACT_FLAGS]) { |
1387 | userflags = nla_get_bitfield32(nla: tb[TCA_ACT_FLAGS]); |
1388 | if (!tc_act_flags_valid(flags: userflags.value)) { |
1389 | err = -EINVAL; |
1390 | goto err_out; |
1391 | } |
1392 | } |
1393 | |
1394 | err = a_o->init(net, tb[TCA_ACT_OPTIONS], est, &a, tp, |
1395 | userflags.value | flags, extack); |
1396 | } else { |
1397 | err = a_o->init(net, nla, est, &a, tp, userflags.value | flags, |
1398 | extack); |
1399 | } |
1400 | if (err < 0) |
1401 | goto err_out; |
1402 | *init_res = err; |
1403 | |
1404 | if (!police && tb[TCA_ACT_COOKIE]) |
1405 | tcf_set_action_cookie(old_cookie: &a->user_cookie, new_cookie: user_cookie); |
1406 | |
1407 | if (!police) |
1408 | a->hw_stats = hw_stats; |
1409 | |
1410 | return a; |
1411 | |
1412 | err_out: |
1413 | if (user_cookie) { |
1414 | kfree(objp: user_cookie->data); |
1415 | kfree(objp: user_cookie); |
1416 | } |
1417 | return ERR_PTR(error: err); |
1418 | } |
1419 | |
1420 | static bool tc_act_bind(u32 flags) |
1421 | { |
1422 | return !!(flags & TCA_ACT_FLAGS_BIND); |
1423 | } |
1424 | |
1425 | /* Returns numbers of initialized actions or negative error. */ |
1426 | |
1427 | int tcf_action_init(struct net *net, struct tcf_proto *tp, struct nlattr *nla, |
1428 | struct nlattr *est, struct tc_action *actions[], |
1429 | int init_res[], size_t *attr_size, |
1430 | u32 flags, u32 fl_flags, |
1431 | struct netlink_ext_ack *extack) |
1432 | { |
1433 | struct tc_action_ops *ops[TCA_ACT_MAX_PRIO] = {}; |
1434 | struct nlattr *tb[TCA_ACT_MAX_PRIO + 1]; |
1435 | struct tc_action *act; |
1436 | size_t sz = 0; |
1437 | int err; |
1438 | int i; |
1439 | |
1440 | err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX_PRIO, nla, NULL, |
1441 | extack); |
1442 | if (err < 0) |
1443 | return err; |
1444 | |
1445 | for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) { |
1446 | struct tc_action_ops *a_o; |
1447 | |
1448 | a_o = tc_action_load_ops(nla: tb[i], police: flags & TCA_ACT_FLAGS_POLICE, |
1449 | rtnl_held: !(flags & TCA_ACT_FLAGS_NO_RTNL), |
1450 | extack); |
1451 | if (IS_ERR(ptr: a_o)) { |
1452 | err = PTR_ERR(ptr: a_o); |
1453 | goto err_mod; |
1454 | } |
1455 | ops[i - 1] = a_o; |
1456 | } |
1457 | |
1458 | for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) { |
1459 | act = tcf_action_init_1(net, tp, nla: tb[i], est, a_o: ops[i - 1], |
1460 | init_res: &init_res[i - 1], flags, extack); |
1461 | if (IS_ERR(ptr: act)) { |
1462 | err = PTR_ERR(ptr: act); |
1463 | goto err; |
1464 | } |
1465 | sz += tcf_action_fill_size(act); |
1466 | /* Start from index 0 */ |
1467 | actions[i - 1] = act; |
1468 | if (tc_act_bind(flags)) { |
1469 | bool skip_sw = tc_skip_sw(flags: fl_flags); |
1470 | bool skip_hw = tc_skip_hw(flags: fl_flags); |
1471 | |
1472 | if (tc_act_bind(flags: act->tcfa_flags)) |
1473 | continue; |
1474 | if (skip_sw != tc_act_skip_sw(flags: act->tcfa_flags) || |
1475 | skip_hw != tc_act_skip_hw(flags: act->tcfa_flags)) { |
1476 | NL_SET_ERR_MSG(extack, |
1477 | "Mismatch between action and filter offload flags" ); |
1478 | err = -EINVAL; |
1479 | goto err; |
1480 | } |
1481 | } else { |
1482 | err = tcf_action_offload_add(action: act, extack); |
1483 | if (tc_act_skip_sw(flags: act->tcfa_flags) && err) |
1484 | goto err; |
1485 | } |
1486 | } |
1487 | |
1488 | /* We have to commit them all together, because if any error happened in |
1489 | * between, we could not handle the failure gracefully. |
1490 | */ |
1491 | tcf_idr_insert_many(actions); |
1492 | |
1493 | *attr_size = tcf_action_full_attrs_size(sz); |
1494 | err = i - 1; |
1495 | goto err_mod; |
1496 | |
1497 | err: |
1498 | tcf_action_destroy(actions, bind: flags & TCA_ACT_FLAGS_BIND); |
1499 | err_mod: |
1500 | for (i = 0; i < TCA_ACT_MAX_PRIO; i++) { |
1501 | if (ops[i]) |
1502 | module_put(module: ops[i]->owner); |
1503 | } |
1504 | return err; |
1505 | } |
1506 | |
1507 | void tcf_action_update_stats(struct tc_action *a, u64 bytes, u64 packets, |
1508 | u64 drops, bool hw) |
1509 | { |
1510 | if (a->cpu_bstats) { |
1511 | _bstats_update(this_cpu_ptr(a->cpu_bstats), bytes, packets); |
1512 | |
1513 | this_cpu_ptr(a->cpu_qstats)->drops += drops; |
1514 | |
1515 | if (hw) |
1516 | _bstats_update(this_cpu_ptr(a->cpu_bstats_hw), |
1517 | bytes, packets); |
1518 | return; |
1519 | } |
1520 | |
1521 | _bstats_update(bstats: &a->tcfa_bstats, bytes, packets); |
1522 | a->tcfa_qstats.drops += drops; |
1523 | if (hw) |
1524 | _bstats_update(bstats: &a->tcfa_bstats_hw, bytes, packets); |
1525 | } |
1526 | EXPORT_SYMBOL(tcf_action_update_stats); |
1527 | |
1528 | int tcf_action_copy_stats(struct sk_buff *skb, struct tc_action *p, |
1529 | int compat_mode) |
1530 | { |
1531 | int err = 0; |
1532 | struct gnet_dump d; |
1533 | |
1534 | if (p == NULL) |
1535 | goto errout; |
1536 | |
1537 | /* compat_mode being true specifies a call that is supposed |
1538 | * to add additional backward compatibility statistic TLVs. |
1539 | */ |
1540 | if (compat_mode) { |
1541 | if (p->type == TCA_OLD_COMPAT) |
1542 | err = gnet_stats_start_copy_compat(skb, type: 0, |
1543 | tc_stats_type: TCA_STATS, |
1544 | xstats_type: TCA_XSTATS, |
1545 | lock: &p->tcfa_lock, d: &d, |
1546 | padattr: TCA_PAD); |
1547 | else |
1548 | return 0; |
1549 | } else |
1550 | err = gnet_stats_start_copy(skb, type: TCA_ACT_STATS, |
1551 | lock: &p->tcfa_lock, d: &d, padattr: TCA_ACT_PAD); |
1552 | |
1553 | if (err < 0) |
1554 | goto errout; |
1555 | |
1556 | if (gnet_stats_copy_basic(d: &d, cpu: p->cpu_bstats, |
1557 | b: &p->tcfa_bstats, running: false) < 0 || |
1558 | gnet_stats_copy_basic_hw(d: &d, cpu: p->cpu_bstats_hw, |
1559 | b: &p->tcfa_bstats_hw, running: false) < 0 || |
1560 | gnet_stats_copy_rate_est(d: &d, ptr: &p->tcfa_rate_est) < 0 || |
1561 | gnet_stats_copy_queue(d: &d, cpu_q: p->cpu_qstats, |
1562 | q: &p->tcfa_qstats, |
1563 | qlen: p->tcfa_qstats.qlen) < 0) |
1564 | goto errout; |
1565 | |
1566 | if (gnet_stats_finish_copy(d: &d) < 0) |
1567 | goto errout; |
1568 | |
1569 | return 0; |
1570 | |
1571 | errout: |
1572 | return -1; |
1573 | } |
1574 | |
1575 | static int tca_get_fill(struct sk_buff *skb, struct tc_action *actions[], |
1576 | u32 portid, u32 seq, u16 flags, int event, int bind, |
1577 | int ref, struct netlink_ext_ack *extack) |
1578 | { |
1579 | struct tcamsg *t; |
1580 | struct nlmsghdr *nlh; |
1581 | unsigned char *b = skb_tail_pointer(skb); |
1582 | struct nlattr *nest; |
1583 | |
1584 | nlh = nlmsg_put(skb, portid, seq, type: event, payload: sizeof(*t), flags); |
1585 | if (!nlh) |
1586 | goto out_nlmsg_trim; |
1587 | t = nlmsg_data(nlh); |
1588 | t->tca_family = AF_UNSPEC; |
1589 | t->tca__pad1 = 0; |
1590 | t->tca__pad2 = 0; |
1591 | |
1592 | if (extack && extack->_msg && |
1593 | nla_put_string(skb, attrtype: TCA_ROOT_EXT_WARN_MSG, str: extack->_msg)) |
1594 | goto out_nlmsg_trim; |
1595 | |
1596 | nest = nla_nest_start_noflag(skb, TCA_ACT_TAB); |
1597 | if (!nest) |
1598 | goto out_nlmsg_trim; |
1599 | |
1600 | if (tcf_action_dump(skb, actions, bind, ref, terse: false) < 0) |
1601 | goto out_nlmsg_trim; |
1602 | |
1603 | nla_nest_end(skb, start: nest); |
1604 | |
1605 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1606 | |
1607 | return skb->len; |
1608 | |
1609 | out_nlmsg_trim: |
1610 | nlmsg_trim(skb, mark: b); |
1611 | return -1; |
1612 | } |
1613 | |
1614 | static int |
1615 | tcf_get_notify(struct net *net, u32 portid, struct nlmsghdr *n, |
1616 | struct tc_action *actions[], int event, |
1617 | struct netlink_ext_ack *extack) |
1618 | { |
1619 | struct sk_buff *skb; |
1620 | |
1621 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
1622 | if (!skb) |
1623 | return -ENOBUFS; |
1624 | if (tca_get_fill(skb, actions, portid, seq: n->nlmsg_seq, flags: 0, event, |
1625 | bind: 0, ref: 1, NULL) <= 0) { |
1626 | NL_SET_ERR_MSG(extack, "Failed to fill netlink attributes while adding TC action" ); |
1627 | kfree_skb(skb); |
1628 | return -EINVAL; |
1629 | } |
1630 | |
1631 | return rtnl_unicast(skb, net, pid: portid); |
1632 | } |
1633 | |
1634 | static struct tc_action *tcf_action_get_1(struct net *net, struct nlattr *nla, |
1635 | struct nlmsghdr *n, u32 portid, |
1636 | struct netlink_ext_ack *extack) |
1637 | { |
1638 | struct nlattr *tb[TCA_ACT_MAX + 1]; |
1639 | const struct tc_action_ops *ops; |
1640 | struct tc_action *a; |
1641 | int index; |
1642 | int err; |
1643 | |
1644 | err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla, |
1645 | policy: tcf_action_policy, extack); |
1646 | if (err < 0) |
1647 | goto err_out; |
1648 | |
1649 | err = -EINVAL; |
1650 | if (tb[TCA_ACT_INDEX] == NULL || |
1651 | nla_len(nla: tb[TCA_ACT_INDEX]) < sizeof(index)) { |
1652 | NL_SET_ERR_MSG(extack, "Invalid TC action index value" ); |
1653 | goto err_out; |
1654 | } |
1655 | index = nla_get_u32(nla: tb[TCA_ACT_INDEX]); |
1656 | |
1657 | err = -EINVAL; |
1658 | ops = tc_lookup_action(kind: tb[TCA_ACT_KIND]); |
1659 | if (!ops) { /* could happen in batch of actions */ |
1660 | NL_SET_ERR_MSG(extack, "Specified TC action kind not found" ); |
1661 | goto err_out; |
1662 | } |
1663 | err = -ENOENT; |
1664 | if (__tcf_idr_search(net, ops, a: &a, index) == 0) { |
1665 | NL_SET_ERR_MSG(extack, "TC action with specified index not found" ); |
1666 | goto err_mod; |
1667 | } |
1668 | |
1669 | module_put(module: ops->owner); |
1670 | return a; |
1671 | |
1672 | err_mod: |
1673 | module_put(module: ops->owner); |
1674 | err_out: |
1675 | return ERR_PTR(error: err); |
1676 | } |
1677 | |
1678 | static int tca_action_flush(struct net *net, struct nlattr *nla, |
1679 | struct nlmsghdr *n, u32 portid, |
1680 | struct netlink_ext_ack *extack) |
1681 | { |
1682 | struct sk_buff *skb; |
1683 | unsigned char *b; |
1684 | struct nlmsghdr *nlh; |
1685 | struct tcamsg *t; |
1686 | struct netlink_callback dcb; |
1687 | struct nlattr *nest; |
1688 | struct nlattr *tb[TCA_ACT_MAX + 1]; |
1689 | const struct tc_action_ops *ops; |
1690 | struct nlattr *kind; |
1691 | int err = -ENOMEM; |
1692 | |
1693 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
1694 | if (!skb) |
1695 | return err; |
1696 | |
1697 | b = skb_tail_pointer(skb); |
1698 | |
1699 | err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla, |
1700 | policy: tcf_action_policy, extack); |
1701 | if (err < 0) |
1702 | goto err_out; |
1703 | |
1704 | err = -EINVAL; |
1705 | kind = tb[TCA_ACT_KIND]; |
1706 | ops = tc_lookup_action(kind); |
1707 | if (!ops) { /*some idjot trying to flush unknown action */ |
1708 | NL_SET_ERR_MSG(extack, "Cannot flush unknown TC action" ); |
1709 | goto err_out; |
1710 | } |
1711 | |
1712 | nlh = nlmsg_put(skb, portid, seq: n->nlmsg_seq, RTM_DELACTION, |
1713 | payload: sizeof(*t), flags: 0); |
1714 | if (!nlh) { |
1715 | NL_SET_ERR_MSG(extack, "Failed to create TC action flush notification" ); |
1716 | goto out_module_put; |
1717 | } |
1718 | t = nlmsg_data(nlh); |
1719 | t->tca_family = AF_UNSPEC; |
1720 | t->tca__pad1 = 0; |
1721 | t->tca__pad2 = 0; |
1722 | |
1723 | nest = nla_nest_start_noflag(skb, TCA_ACT_TAB); |
1724 | if (!nest) { |
1725 | NL_SET_ERR_MSG(extack, "Failed to add new netlink message" ); |
1726 | goto out_module_put; |
1727 | } |
1728 | |
1729 | err = __tcf_generic_walker(net, skb, cb: &dcb, RTM_DELACTION, ops, extack); |
1730 | if (err <= 0) { |
1731 | nla_nest_cancel(skb, start: nest); |
1732 | goto out_module_put; |
1733 | } |
1734 | |
1735 | nla_nest_end(skb, start: nest); |
1736 | |
1737 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1738 | nlh->nlmsg_flags |= NLM_F_ROOT; |
1739 | module_put(module: ops->owner); |
1740 | err = rtnetlink_send(skb, net, pid: portid, RTNLGRP_TC, |
1741 | echo: n->nlmsg_flags & NLM_F_ECHO); |
1742 | if (err < 0) |
1743 | NL_SET_ERR_MSG(extack, "Failed to send TC action flush notification" ); |
1744 | |
1745 | return err; |
1746 | |
1747 | out_module_put: |
1748 | module_put(module: ops->owner); |
1749 | err_out: |
1750 | kfree_skb(skb); |
1751 | return err; |
1752 | } |
1753 | |
1754 | static int tcf_action_delete(struct net *net, struct tc_action *actions[]) |
1755 | { |
1756 | int i; |
1757 | |
1758 | for (i = 0; i < TCA_ACT_MAX_PRIO && actions[i]; i++) { |
1759 | struct tc_action *a = actions[i]; |
1760 | const struct tc_action_ops *ops = a->ops; |
1761 | /* Actions can be deleted concurrently so we must save their |
1762 | * type and id to search again after reference is released. |
1763 | */ |
1764 | struct tcf_idrinfo *idrinfo = a->idrinfo; |
1765 | u32 act_index = a->tcfa_index; |
1766 | |
1767 | actions[i] = NULL; |
1768 | if (tcf_action_put(p: a)) { |
1769 | /* last reference, action was deleted concurrently */ |
1770 | module_put(module: ops->owner); |
1771 | } else { |
1772 | int ret; |
1773 | |
1774 | /* now do the delete */ |
1775 | ret = tcf_idr_delete_index(idrinfo, index: act_index); |
1776 | if (ret < 0) |
1777 | return ret; |
1778 | } |
1779 | } |
1780 | return 0; |
1781 | } |
1782 | |
1783 | static int |
1784 | tcf_reoffload_del_notify(struct net *net, struct tc_action *action) |
1785 | { |
1786 | size_t attr_size = tcf_action_fill_size(act: action); |
1787 | struct tc_action *actions[TCA_ACT_MAX_PRIO] = { |
1788 | [0] = action, |
1789 | }; |
1790 | const struct tc_action_ops *ops = action->ops; |
1791 | struct sk_buff *skb; |
1792 | int ret; |
1793 | |
1794 | skb = alloc_skb(size: attr_size <= NLMSG_GOODSIZE ? NLMSG_GOODSIZE : attr_size, |
1795 | GFP_KERNEL); |
1796 | if (!skb) |
1797 | return -ENOBUFS; |
1798 | |
1799 | if (tca_get_fill(skb, actions, portid: 0, seq: 0, flags: 0, RTM_DELACTION, bind: 0, ref: 1, NULL) <= 0) { |
1800 | kfree_skb(skb); |
1801 | return -EINVAL; |
1802 | } |
1803 | |
1804 | ret = tcf_idr_release_unsafe(p: action); |
1805 | if (ret == ACT_P_DELETED) { |
1806 | module_put(module: ops->owner); |
1807 | ret = rtnetlink_send(skb, net, pid: 0, RTNLGRP_TC, echo: 0); |
1808 | } else { |
1809 | kfree_skb(skb); |
1810 | } |
1811 | |
1812 | return ret; |
1813 | } |
1814 | |
1815 | int tcf_action_reoffload_cb(flow_indr_block_bind_cb_t *cb, |
1816 | void *cb_priv, bool add) |
1817 | { |
1818 | struct tc_act_pernet_id *id_ptr; |
1819 | struct tcf_idrinfo *idrinfo; |
1820 | struct tc_action_net *tn; |
1821 | struct tc_action *p; |
1822 | unsigned int act_id; |
1823 | unsigned long tmp; |
1824 | unsigned long id; |
1825 | struct idr *idr; |
1826 | struct net *net; |
1827 | int ret; |
1828 | |
1829 | if (!cb) |
1830 | return -EINVAL; |
1831 | |
1832 | down_read(sem: &net_rwsem); |
1833 | mutex_lock(&act_id_mutex); |
1834 | |
1835 | for_each_net(net) { |
1836 | list_for_each_entry(id_ptr, &act_pernet_id_list, list) { |
1837 | act_id = id_ptr->id; |
1838 | tn = net_generic(net, id: act_id); |
1839 | if (!tn) |
1840 | continue; |
1841 | idrinfo = tn->idrinfo; |
1842 | if (!idrinfo) |
1843 | continue; |
1844 | |
1845 | mutex_lock(&idrinfo->lock); |
1846 | idr = &idrinfo->action_idr; |
1847 | idr_for_each_entry_ul(idr, p, tmp, id) { |
1848 | if (IS_ERR(ptr: p) || tc_act_bind(flags: p->tcfa_flags)) |
1849 | continue; |
1850 | if (add) { |
1851 | tcf_action_offload_add_ex(action: p, NULL, cb, |
1852 | cb_priv); |
1853 | continue; |
1854 | } |
1855 | |
1856 | /* cb unregister to update hw count */ |
1857 | ret = tcf_action_offload_del_ex(action: p, cb, cb_priv); |
1858 | if (ret < 0) |
1859 | continue; |
1860 | if (tc_act_skip_sw(flags: p->tcfa_flags) && |
1861 | !tc_act_in_hw(act: p)) |
1862 | tcf_reoffload_del_notify(net, action: p); |
1863 | } |
1864 | mutex_unlock(lock: &idrinfo->lock); |
1865 | } |
1866 | } |
1867 | mutex_unlock(lock: &act_id_mutex); |
1868 | up_read(sem: &net_rwsem); |
1869 | |
1870 | return 0; |
1871 | } |
1872 | |
1873 | static int |
1874 | tcf_del_notify(struct net *net, struct nlmsghdr *n, struct tc_action *actions[], |
1875 | u32 portid, size_t attr_size, struct netlink_ext_ack *extack) |
1876 | { |
1877 | int ret; |
1878 | struct sk_buff *skb; |
1879 | |
1880 | skb = alloc_skb(size: attr_size <= NLMSG_GOODSIZE ? NLMSG_GOODSIZE : attr_size, |
1881 | GFP_KERNEL); |
1882 | if (!skb) |
1883 | return -ENOBUFS; |
1884 | |
1885 | if (tca_get_fill(skb, actions, portid, seq: n->nlmsg_seq, flags: 0, RTM_DELACTION, |
1886 | bind: 0, ref: 2, extack) <= 0) { |
1887 | NL_SET_ERR_MSG(extack, "Failed to fill netlink TC action attributes" ); |
1888 | kfree_skb(skb); |
1889 | return -EINVAL; |
1890 | } |
1891 | |
1892 | /* now do the delete */ |
1893 | ret = tcf_action_delete(net, actions); |
1894 | if (ret < 0) { |
1895 | NL_SET_ERR_MSG(extack, "Failed to delete TC action" ); |
1896 | kfree_skb(skb); |
1897 | return ret; |
1898 | } |
1899 | |
1900 | ret = rtnetlink_send(skb, net, pid: portid, RTNLGRP_TC, |
1901 | echo: n->nlmsg_flags & NLM_F_ECHO); |
1902 | return ret; |
1903 | } |
1904 | |
1905 | static int |
1906 | tca_action_gd(struct net *net, struct nlattr *nla, struct nlmsghdr *n, |
1907 | u32 portid, int event, struct netlink_ext_ack *extack) |
1908 | { |
1909 | int i, ret; |
1910 | struct nlattr *tb[TCA_ACT_MAX_PRIO + 1]; |
1911 | struct tc_action *act; |
1912 | size_t attr_size = 0; |
1913 | struct tc_action *actions[TCA_ACT_MAX_PRIO] = {}; |
1914 | |
1915 | ret = nla_parse_nested_deprecated(tb, TCA_ACT_MAX_PRIO, nla, NULL, |
1916 | extack); |
1917 | if (ret < 0) |
1918 | return ret; |
1919 | |
1920 | if (event == RTM_DELACTION && n->nlmsg_flags & NLM_F_ROOT) { |
1921 | if (tb[1]) |
1922 | return tca_action_flush(net, nla: tb[1], n, portid, extack); |
1923 | |
1924 | NL_SET_ERR_MSG(extack, "Invalid netlink attributes while flushing TC action" ); |
1925 | return -EINVAL; |
1926 | } |
1927 | |
1928 | for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) { |
1929 | act = tcf_action_get_1(net, nla: tb[i], n, portid, extack); |
1930 | if (IS_ERR(ptr: act)) { |
1931 | ret = PTR_ERR(ptr: act); |
1932 | goto err; |
1933 | } |
1934 | attr_size += tcf_action_fill_size(act); |
1935 | actions[i - 1] = act; |
1936 | } |
1937 | |
1938 | attr_size = tcf_action_full_attrs_size(sz: attr_size); |
1939 | |
1940 | if (event == RTM_GETACTION) |
1941 | ret = tcf_get_notify(net, portid, n, actions, event, extack); |
1942 | else { /* delete */ |
1943 | ret = tcf_del_notify(net, n, actions, portid, attr_size, extack); |
1944 | if (ret) |
1945 | goto err; |
1946 | return 0; |
1947 | } |
1948 | err: |
1949 | tcf_action_put_many(actions); |
1950 | return ret; |
1951 | } |
1952 | |
1953 | static int |
1954 | tcf_add_notify(struct net *net, struct nlmsghdr *n, struct tc_action *actions[], |
1955 | u32 portid, size_t attr_size, struct netlink_ext_ack *extack) |
1956 | { |
1957 | struct sk_buff *skb; |
1958 | |
1959 | skb = alloc_skb(size: attr_size <= NLMSG_GOODSIZE ? NLMSG_GOODSIZE : attr_size, |
1960 | GFP_KERNEL); |
1961 | if (!skb) |
1962 | return -ENOBUFS; |
1963 | |
1964 | if (tca_get_fill(skb, actions, portid, seq: n->nlmsg_seq, flags: n->nlmsg_flags, |
1965 | RTM_NEWACTION, bind: 0, ref: 0, extack) <= 0) { |
1966 | NL_SET_ERR_MSG(extack, "Failed to fill netlink attributes while adding TC action" ); |
1967 | kfree_skb(skb); |
1968 | return -EINVAL; |
1969 | } |
1970 | |
1971 | return rtnetlink_send(skb, net, pid: portid, RTNLGRP_TC, |
1972 | echo: n->nlmsg_flags & NLM_F_ECHO); |
1973 | } |
1974 | |
1975 | static int tcf_action_add(struct net *net, struct nlattr *nla, |
1976 | struct nlmsghdr *n, u32 portid, u32 flags, |
1977 | struct netlink_ext_ack *extack) |
1978 | { |
1979 | size_t attr_size = 0; |
1980 | int loop, ret, i; |
1981 | struct tc_action *actions[TCA_ACT_MAX_PRIO] = {}; |
1982 | int init_res[TCA_ACT_MAX_PRIO] = {}; |
1983 | |
1984 | for (loop = 0; loop < 10; loop++) { |
1985 | ret = tcf_action_init(net, NULL, nla, NULL, actions, init_res, |
1986 | attr_size: &attr_size, flags, fl_flags: 0, extack); |
1987 | if (ret != -EAGAIN) |
1988 | break; |
1989 | } |
1990 | |
1991 | if (ret < 0) |
1992 | return ret; |
1993 | ret = tcf_add_notify(net, n, actions, portid, attr_size, extack); |
1994 | |
1995 | /* only put existing actions */ |
1996 | for (i = 0; i < TCA_ACT_MAX_PRIO; i++) |
1997 | if (init_res[i] == ACT_P_CREATED) |
1998 | actions[i] = NULL; |
1999 | tcf_action_put_many(actions); |
2000 | |
2001 | return ret; |
2002 | } |
2003 | |
2004 | static const struct nla_policy tcaa_policy[TCA_ROOT_MAX + 1] = { |
2005 | [TCA_ROOT_FLAGS] = NLA_POLICY_BITFIELD32(TCA_ACT_FLAG_LARGE_DUMP_ON | |
2006 | TCA_ACT_FLAG_TERSE_DUMP), |
2007 | [TCA_ROOT_TIME_DELTA] = { .type = NLA_U32 }, |
2008 | }; |
2009 | |
2010 | static int tc_ctl_action(struct sk_buff *skb, struct nlmsghdr *n, |
2011 | struct netlink_ext_ack *extack) |
2012 | { |
2013 | struct net *net = sock_net(sk: skb->sk); |
2014 | struct nlattr *tca[TCA_ROOT_MAX + 1]; |
2015 | u32 portid = NETLINK_CB(skb).portid; |
2016 | u32 flags = 0; |
2017 | int ret = 0; |
2018 | |
2019 | if ((n->nlmsg_type != RTM_GETACTION) && |
2020 | !netlink_capable(skb, CAP_NET_ADMIN)) |
2021 | return -EPERM; |
2022 | |
2023 | ret = nlmsg_parse_deprecated(nlh: n, hdrlen: sizeof(struct tcamsg), tb: tca, |
2024 | TCA_ROOT_MAX, NULL, extack); |
2025 | if (ret < 0) |
2026 | return ret; |
2027 | |
2028 | if (tca[TCA_ACT_TAB] == NULL) { |
2029 | NL_SET_ERR_MSG(extack, "Netlink action attributes missing" ); |
2030 | return -EINVAL; |
2031 | } |
2032 | |
2033 | /* n->nlmsg_flags & NLM_F_CREATE */ |
2034 | switch (n->nlmsg_type) { |
2035 | case RTM_NEWACTION: |
2036 | /* we are going to assume all other flags |
2037 | * imply create only if it doesn't exist |
2038 | * Note that CREATE | EXCL implies that |
2039 | * but since we want avoid ambiguity (eg when flags |
2040 | * is zero) then just set this |
2041 | */ |
2042 | if (n->nlmsg_flags & NLM_F_REPLACE) |
2043 | flags = TCA_ACT_FLAGS_REPLACE; |
2044 | ret = tcf_action_add(net, nla: tca[TCA_ACT_TAB], n, portid, flags, |
2045 | extack); |
2046 | break; |
2047 | case RTM_DELACTION: |
2048 | ret = tca_action_gd(net, nla: tca[TCA_ACT_TAB], n, |
2049 | portid, RTM_DELACTION, extack); |
2050 | break; |
2051 | case RTM_GETACTION: |
2052 | ret = tca_action_gd(net, nla: tca[TCA_ACT_TAB], n, |
2053 | portid, RTM_GETACTION, extack); |
2054 | break; |
2055 | default: |
2056 | BUG(); |
2057 | } |
2058 | |
2059 | return ret; |
2060 | } |
2061 | |
2062 | static struct nlattr *find_dump_kind(struct nlattr **nla) |
2063 | { |
2064 | struct nlattr *tb1, *tb2[TCA_ACT_MAX + 1]; |
2065 | struct nlattr *tb[TCA_ACT_MAX_PRIO + 1]; |
2066 | struct nlattr *kind; |
2067 | |
2068 | tb1 = nla[TCA_ACT_TAB]; |
2069 | if (tb1 == NULL) |
2070 | return NULL; |
2071 | |
2072 | if (nla_parse_deprecated(tb, TCA_ACT_MAX_PRIO, head: nla_data(nla: tb1), NLMSG_ALIGN(nla_len(tb1)), NULL, NULL) < 0) |
2073 | return NULL; |
2074 | |
2075 | if (tb[1] == NULL) |
2076 | return NULL; |
2077 | if (nla_parse_nested_deprecated(tb: tb2, TCA_ACT_MAX, nla: tb[1], policy: tcf_action_policy, NULL) < 0) |
2078 | return NULL; |
2079 | kind = tb2[TCA_ACT_KIND]; |
2080 | |
2081 | return kind; |
2082 | } |
2083 | |
2084 | static int tc_dump_action(struct sk_buff *skb, struct netlink_callback *cb) |
2085 | { |
2086 | struct net *net = sock_net(sk: skb->sk); |
2087 | struct nlmsghdr *nlh; |
2088 | unsigned char *b = skb_tail_pointer(skb); |
2089 | struct nlattr *nest; |
2090 | struct tc_action_ops *a_o; |
2091 | int ret = 0; |
2092 | struct tcamsg *t = (struct tcamsg *) nlmsg_data(nlh: cb->nlh); |
2093 | struct nlattr *tb[TCA_ROOT_MAX + 1]; |
2094 | struct nlattr *count_attr = NULL; |
2095 | unsigned long jiffy_since = 0; |
2096 | struct nlattr *kind = NULL; |
2097 | struct nla_bitfield32 bf; |
2098 | u32 msecs_since = 0; |
2099 | u32 act_count = 0; |
2100 | |
2101 | ret = nlmsg_parse_deprecated(nlh: cb->nlh, hdrlen: sizeof(struct tcamsg), tb, |
2102 | TCA_ROOT_MAX, policy: tcaa_policy, extack: cb->extack); |
2103 | if (ret < 0) |
2104 | return ret; |
2105 | |
2106 | kind = find_dump_kind(nla: tb); |
2107 | if (kind == NULL) { |
2108 | pr_info("tc_dump_action: action bad kind\n" ); |
2109 | return 0; |
2110 | } |
2111 | |
2112 | a_o = tc_lookup_action(kind); |
2113 | if (a_o == NULL) |
2114 | return 0; |
2115 | |
2116 | cb->args[2] = 0; |
2117 | if (tb[TCA_ROOT_FLAGS]) { |
2118 | bf = nla_get_bitfield32(nla: tb[TCA_ROOT_FLAGS]); |
2119 | cb->args[2] = bf.value; |
2120 | } |
2121 | |
2122 | if (tb[TCA_ROOT_TIME_DELTA]) { |
2123 | msecs_since = nla_get_u32(nla: tb[TCA_ROOT_TIME_DELTA]); |
2124 | } |
2125 | |
2126 | nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, seq: cb->nlh->nlmsg_seq, |
2127 | type: cb->nlh->nlmsg_type, payload: sizeof(*t), flags: 0); |
2128 | if (!nlh) |
2129 | goto out_module_put; |
2130 | |
2131 | if (msecs_since) |
2132 | jiffy_since = jiffies - msecs_to_jiffies(m: msecs_since); |
2133 | |
2134 | t = nlmsg_data(nlh); |
2135 | t->tca_family = AF_UNSPEC; |
2136 | t->tca__pad1 = 0; |
2137 | t->tca__pad2 = 0; |
2138 | cb->args[3] = jiffy_since; |
2139 | count_attr = nla_reserve(skb, attrtype: TCA_ROOT_COUNT, attrlen: sizeof(u32)); |
2140 | if (!count_attr) |
2141 | goto out_module_put; |
2142 | |
2143 | nest = nla_nest_start_noflag(skb, TCA_ACT_TAB); |
2144 | if (nest == NULL) |
2145 | goto out_module_put; |
2146 | |
2147 | ret = __tcf_generic_walker(net, skb, cb, RTM_GETACTION, ops: a_o, NULL); |
2148 | if (ret < 0) |
2149 | goto out_module_put; |
2150 | |
2151 | if (ret > 0) { |
2152 | nla_nest_end(skb, start: nest); |
2153 | ret = skb->len; |
2154 | act_count = cb->args[1]; |
2155 | memcpy(nla_data(count_attr), &act_count, sizeof(u32)); |
2156 | cb->args[1] = 0; |
2157 | } else |
2158 | nlmsg_trim(skb, mark: b); |
2159 | |
2160 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
2161 | if (NETLINK_CB(cb->skb).portid && ret) |
2162 | nlh->nlmsg_flags |= NLM_F_MULTI; |
2163 | module_put(module: a_o->owner); |
2164 | return skb->len; |
2165 | |
2166 | out_module_put: |
2167 | module_put(module: a_o->owner); |
2168 | nlmsg_trim(skb, mark: b); |
2169 | return skb->len; |
2170 | } |
2171 | |
2172 | static int __init tc_action_init(void) |
2173 | { |
2174 | rtnl_register(PF_UNSPEC, RTM_NEWACTION, tc_ctl_action, NULL, flags: 0); |
2175 | rtnl_register(PF_UNSPEC, RTM_DELACTION, tc_ctl_action, NULL, flags: 0); |
2176 | rtnl_register(PF_UNSPEC, RTM_GETACTION, tc_ctl_action, tc_dump_action, |
2177 | flags: 0); |
2178 | |
2179 | return 0; |
2180 | } |
2181 | |
2182 | subsys_initcall(tc_action_init); |
2183 | |