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1 | #ifndef __NET_PKT_CLS_H | |
2 | #define __NET_PKT_CLS_H | |
3 | ||
4 | #include <linux/pkt_cls.h> | |
5 | #include <net/sch_generic.h> | |
6 | #include <net/act_api.h> | |
7 | ||
8 | /* Basic packet classifier frontend definitions. */ | |
9 | ||
10 | struct tcf_walker { | |
11 | int stop; | |
12 | int skip; | |
13 | int count; | |
14 | int (*fn)(struct tcf_proto *, unsigned long node, struct tcf_walker *); | |
15 | }; | |
16 | ||
17 | int register_tcf_proto_ops(struct tcf_proto_ops *ops); | |
18 | int unregister_tcf_proto_ops(struct tcf_proto_ops *ops); | |
19 | ||
20 | static inline unsigned long | |
21 | __cls_set_class(unsigned long *clp, unsigned long cl) | |
22 | { | |
23 | return xchg(clp, cl); | |
24 | } | |
25 | ||
26 | static inline unsigned long | |
27 | cls_set_class(struct tcf_proto *tp, unsigned long *clp, | |
28 | unsigned long cl) | |
29 | { | |
30 | unsigned long old_cl; | |
31 | ||
32 | tcf_tree_lock(tp); | |
33 | old_cl = __cls_set_class(clp, cl); | |
34 | tcf_tree_unlock(tp); | |
35 | ||
36 | return old_cl; | |
37 | } | |
38 | ||
39 | static inline void | |
40 | tcf_bind_filter(struct tcf_proto *tp, struct tcf_result *r, unsigned long base) | |
41 | { | |
42 | unsigned long cl; | |
43 | ||
44 | cl = tp->q->ops->cl_ops->bind_tcf(tp->q, base, r->classid); | |
45 | cl = cls_set_class(tp, &r->class, cl); | |
46 | if (cl) | |
47 | tp->q->ops->cl_ops->unbind_tcf(tp->q, cl); | |
48 | } | |
49 | ||
50 | static inline void | |
51 | tcf_unbind_filter(struct tcf_proto *tp, struct tcf_result *r) | |
52 | { | |
53 | unsigned long cl; | |
54 | ||
55 | if ((cl = __cls_set_class(&r->class, 0)) != 0) | |
56 | tp->q->ops->cl_ops->unbind_tcf(tp->q, cl); | |
57 | } | |
58 | ||
59 | struct tcf_exts { | |
60 | #ifdef CONFIG_NET_CLS_ACT | |
61 | __u32 type; /* for backward compat(TCA_OLD_COMPAT) */ | |
62 | int nr_actions; | |
63 | struct tc_action **actions; | |
64 | #endif | |
65 | /* Map to export classifier specific extension TLV types to the | |
66 | * generic extensions API. Unsupported extensions must be set to 0. | |
67 | */ | |
68 | int action; | |
69 | int police; | |
70 | }; | |
71 | ||
72 | static inline int tcf_exts_init(struct tcf_exts *exts, int action, int police) | |
73 | { | |
74 | #ifdef CONFIG_NET_CLS_ACT | |
75 | exts->type = 0; | |
76 | exts->nr_actions = 0; | |
77 | exts->actions = kcalloc(TCA_ACT_MAX_PRIO, sizeof(struct tc_action *), | |
78 | GFP_KERNEL); | |
79 | if (!exts->actions) | |
80 | return -ENOMEM; | |
81 | #endif | |
82 | exts->action = action; | |
83 | exts->police = police; | |
84 | return 0; | |
85 | } | |
86 | ||
87 | /** | |
88 | * tcf_exts_is_predicative - check if a predicative extension is present | |
89 | * @exts: tc filter extensions handle | |
90 | * | |
91 | * Returns 1 if a predicative extension is present, i.e. an extension which | |
92 | * might cause further actions and thus overrule the regular tcf_result. | |
93 | */ | |
94 | static inline int | |
95 | tcf_exts_is_predicative(struct tcf_exts *exts) | |
96 | { | |
97 | #ifdef CONFIG_NET_CLS_ACT | |
98 | return exts->nr_actions; | |
99 | #else | |
100 | return 0; | |
101 | #endif | |
102 | } | |
103 | ||
104 | /** | |
105 | * tcf_exts_is_available - check if at least one extension is present | |
106 | * @exts: tc filter extensions handle | |
107 | * | |
108 | * Returns 1 if at least one extension is present. | |
109 | */ | |
110 | static inline int | |
111 | tcf_exts_is_available(struct tcf_exts *exts) | |
112 | { | |
113 | /* All non-predicative extensions must be added here. */ | |
114 | return tcf_exts_is_predicative(exts); | |
115 | } | |
116 | ||
117 | static inline void tcf_exts_to_list(const struct tcf_exts *exts, | |
118 | struct list_head *actions) | |
119 | { | |
120 | #ifdef CONFIG_NET_CLS_ACT | |
121 | int i; | |
122 | ||
123 | for (i = 0; i < exts->nr_actions; i++) { | |
124 | struct tc_action *a = exts->actions[i]; | |
125 | ||
126 | list_add_tail(&a->list, actions); | |
127 | } | |
128 | #endif | |
129 | } | |
130 | ||
131 | /** | |
132 | * tcf_exts_exec - execute tc filter extensions | |
133 | * @skb: socket buffer | |
134 | * @exts: tc filter extensions handle | |
135 | * @res: desired result | |
136 | * | |
137 | * Executes all configured extensions. Returns 0 on a normal execution, | |
138 | * a negative number if the filter must be considered unmatched or | |
139 | * a positive action code (TC_ACT_*) which must be returned to the | |
140 | * underlying layer. | |
141 | */ | |
142 | static inline int | |
143 | tcf_exts_exec(struct sk_buff *skb, struct tcf_exts *exts, | |
144 | struct tcf_result *res) | |
145 | { | |
146 | #ifdef CONFIG_NET_CLS_ACT | |
147 | if (exts->nr_actions) | |
148 | return tcf_action_exec(skb, exts->actions, exts->nr_actions, | |
149 | res); | |
150 | #endif | |
151 | return 0; | |
152 | } | |
153 | ||
154 | #ifdef CONFIG_NET_CLS_ACT | |
155 | ||
156 | #define tc_no_actions(_exts) ((_exts)->nr_actions == 0) | |
157 | #define tc_single_action(_exts) ((_exts)->nr_actions == 1) | |
158 | ||
159 | #else /* CONFIG_NET_CLS_ACT */ | |
160 | ||
161 | #define tc_no_actions(_exts) true | |
162 | #define tc_single_action(_exts) false | |
163 | ||
164 | #endif /* CONFIG_NET_CLS_ACT */ | |
165 | ||
166 | int tcf_exts_validate(struct net *net, struct tcf_proto *tp, | |
167 | struct nlattr **tb, struct nlattr *rate_tlv, | |
168 | struct tcf_exts *exts, bool ovr); | |
169 | void tcf_exts_destroy(struct tcf_exts *exts); | |
170 | void tcf_exts_change(struct tcf_proto *tp, struct tcf_exts *dst, | |
171 | struct tcf_exts *src); | |
172 | int tcf_exts_dump(struct sk_buff *skb, struct tcf_exts *exts); | |
173 | int tcf_exts_dump_stats(struct sk_buff *skb, struct tcf_exts *exts); | |
174 | int tcf_exts_get_dev(struct net_device *dev, struct tcf_exts *exts, | |
175 | struct net_device **hw_dev); | |
176 | ||
177 | /** | |
178 | * struct tcf_pkt_info - packet information | |
179 | */ | |
180 | struct tcf_pkt_info { | |
181 | unsigned char * ptr; | |
182 | int nexthdr; | |
183 | }; | |
184 | ||
185 | #ifdef CONFIG_NET_EMATCH | |
186 | ||
187 | struct tcf_ematch_ops; | |
188 | ||
189 | /** | |
190 | * struct tcf_ematch - extended match (ematch) | |
191 | * | |
192 | * @matchid: identifier to allow userspace to reidentify a match | |
193 | * @flags: flags specifying attributes and the relation to other matches | |
194 | * @ops: the operations lookup table of the corresponding ematch module | |
195 | * @datalen: length of the ematch specific configuration data | |
196 | * @data: ematch specific data | |
197 | */ | |
198 | struct tcf_ematch { | |
199 | struct tcf_ematch_ops * ops; | |
200 | unsigned long data; | |
201 | unsigned int datalen; | |
202 | u16 matchid; | |
203 | u16 flags; | |
204 | struct net *net; | |
205 | }; | |
206 | ||
207 | static inline int tcf_em_is_container(struct tcf_ematch *em) | |
208 | { | |
209 | return !em->ops; | |
210 | } | |
211 | ||
212 | static inline int tcf_em_is_simple(struct tcf_ematch *em) | |
213 | { | |
214 | return em->flags & TCF_EM_SIMPLE; | |
215 | } | |
216 | ||
217 | static inline int tcf_em_is_inverted(struct tcf_ematch *em) | |
218 | { | |
219 | return em->flags & TCF_EM_INVERT; | |
220 | } | |
221 | ||
222 | static inline int tcf_em_last_match(struct tcf_ematch *em) | |
223 | { | |
224 | return (em->flags & TCF_EM_REL_MASK) == TCF_EM_REL_END; | |
225 | } | |
226 | ||
227 | static inline int tcf_em_early_end(struct tcf_ematch *em, int result) | |
228 | { | |
229 | if (tcf_em_last_match(em)) | |
230 | return 1; | |
231 | ||
232 | if (result == 0 && em->flags & TCF_EM_REL_AND) | |
233 | return 1; | |
234 | ||
235 | if (result != 0 && em->flags & TCF_EM_REL_OR) | |
236 | return 1; | |
237 | ||
238 | return 0; | |
239 | } | |
240 | ||
241 | /** | |
242 | * struct tcf_ematch_tree - ematch tree handle | |
243 | * | |
244 | * @hdr: ematch tree header supplied by userspace | |
245 | * @matches: array of ematches | |
246 | */ | |
247 | struct tcf_ematch_tree { | |
248 | struct tcf_ematch_tree_hdr hdr; | |
249 | struct tcf_ematch * matches; | |
250 | ||
251 | }; | |
252 | ||
253 | /** | |
254 | * struct tcf_ematch_ops - ematch module operations | |
255 | * | |
256 | * @kind: identifier (kind) of this ematch module | |
257 | * @datalen: length of expected configuration data (optional) | |
258 | * @change: called during validation (optional) | |
259 | * @match: called during ematch tree evaluation, must return 1/0 | |
260 | * @destroy: called during destroyage (optional) | |
261 | * @dump: called during dumping process (optional) | |
262 | * @owner: owner, must be set to THIS_MODULE | |
263 | * @link: link to previous/next ematch module (internal use) | |
264 | */ | |
265 | struct tcf_ematch_ops { | |
266 | int kind; | |
267 | int datalen; | |
268 | int (*change)(struct net *net, void *, | |
269 | int, struct tcf_ematch *); | |
270 | int (*match)(struct sk_buff *, struct tcf_ematch *, | |
271 | struct tcf_pkt_info *); | |
272 | void (*destroy)(struct tcf_ematch *); | |
273 | int (*dump)(struct sk_buff *, struct tcf_ematch *); | |
274 | struct module *owner; | |
275 | struct list_head link; | |
276 | }; | |
277 | ||
278 | int tcf_em_register(struct tcf_ematch_ops *); | |
279 | void tcf_em_unregister(struct tcf_ematch_ops *); | |
280 | int tcf_em_tree_validate(struct tcf_proto *, struct nlattr *, | |
281 | struct tcf_ematch_tree *); | |
282 | void tcf_em_tree_destroy(struct tcf_ematch_tree *); | |
283 | int tcf_em_tree_dump(struct sk_buff *, struct tcf_ematch_tree *, int); | |
284 | int __tcf_em_tree_match(struct sk_buff *, struct tcf_ematch_tree *, | |
285 | struct tcf_pkt_info *); | |
286 | ||
287 | /** | |
288 | * tcf_em_tree_change - replace ematch tree of a running classifier | |
289 | * | |
290 | * @tp: classifier kind handle | |
291 | * @dst: destination ematch tree variable | |
292 | * @src: source ematch tree (temporary tree from tcf_em_tree_validate) | |
293 | * | |
294 | * This functions replaces the ematch tree in @dst with the ematch | |
295 | * tree in @src. The classifier in charge of the ematch tree may be | |
296 | * running. | |
297 | */ | |
298 | static inline void tcf_em_tree_change(struct tcf_proto *tp, | |
299 | struct tcf_ematch_tree *dst, | |
300 | struct tcf_ematch_tree *src) | |
301 | { | |
302 | tcf_tree_lock(tp); | |
303 | memcpy(dst, src, sizeof(*dst)); | |
304 | tcf_tree_unlock(tp); | |
305 | } | |
306 | ||
307 | /** | |
308 | * tcf_em_tree_match - evaulate an ematch tree | |
309 | * | |
310 | * @skb: socket buffer of the packet in question | |
311 | * @tree: ematch tree to be used for evaluation | |
312 | * @info: packet information examined by classifier | |
313 | * | |
314 | * This function matches @skb against the ematch tree in @tree by going | |
315 | * through all ematches respecting their logic relations returning | |
316 | * as soon as the result is obvious. | |
317 | * | |
318 | * Returns 1 if the ematch tree as-one matches, no ematches are configured | |
319 | * or ematch is not enabled in the kernel, otherwise 0 is returned. | |
320 | */ | |
321 | static inline int tcf_em_tree_match(struct sk_buff *skb, | |
322 | struct tcf_ematch_tree *tree, | |
323 | struct tcf_pkt_info *info) | |
324 | { | |
325 | if (tree->hdr.nmatches) | |
326 | return __tcf_em_tree_match(skb, tree, info); | |
327 | else | |
328 | return 1; | |
329 | } | |
330 | ||
331 | #define MODULE_ALIAS_TCF_EMATCH(kind) MODULE_ALIAS("ematch-kind-" __stringify(kind)) | |
332 | ||
333 | #else /* CONFIG_NET_EMATCH */ | |
334 | ||
335 | struct tcf_ematch_tree { | |
336 | }; | |
337 | ||
338 | #define tcf_em_tree_validate(tp, tb, t) ((void)(t), 0) | |
339 | #define tcf_em_tree_destroy(t) do { (void)(t); } while(0) | |
340 | #define tcf_em_tree_dump(skb, t, tlv) (0) | |
341 | #define tcf_em_tree_change(tp, dst, src) do { } while(0) | |
342 | #define tcf_em_tree_match(skb, t, info) ((void)(info), 1) | |
343 | ||
344 | #endif /* CONFIG_NET_EMATCH */ | |
345 | ||
346 | static inline unsigned char * tcf_get_base_ptr(struct sk_buff *skb, int layer) | |
347 | { | |
348 | switch (layer) { | |
349 | case TCF_LAYER_LINK: | |
350 | return skb->data; | |
351 | case TCF_LAYER_NETWORK: | |
352 | return skb_network_header(skb); | |
353 | case TCF_LAYER_TRANSPORT: | |
354 | return skb_transport_header(skb); | |
355 | } | |
356 | ||
357 | return NULL; | |
358 | } | |
359 | ||
360 | static inline int tcf_valid_offset(const struct sk_buff *skb, | |
361 | const unsigned char *ptr, const int len) | |
362 | { | |
363 | return likely((ptr + len) <= skb_tail_pointer(skb) && | |
364 | ptr >= skb->head && | |
365 | (ptr <= (ptr + len))); | |
366 | } | |
367 | ||
368 | #ifdef CONFIG_NET_CLS_IND | |
369 | #include <net/net_namespace.h> | |
370 | ||
371 | static inline int | |
372 | tcf_change_indev(struct net *net, struct nlattr *indev_tlv) | |
373 | { | |
374 | char indev[IFNAMSIZ]; | |
375 | struct net_device *dev; | |
376 | ||
377 | if (nla_strlcpy(indev, indev_tlv, IFNAMSIZ) >= IFNAMSIZ) | |
378 | return -EINVAL; | |
379 | dev = __dev_get_by_name(net, indev); | |
380 | if (!dev) | |
381 | return -ENODEV; | |
382 | return dev->ifindex; | |
383 | } | |
384 | ||
385 | static inline bool | |
386 | tcf_match_indev(struct sk_buff *skb, int ifindex) | |
387 | { | |
388 | if (!ifindex) | |
389 | return true; | |
390 | if (!skb->skb_iif) | |
391 | return false; | |
392 | return ifindex == skb->skb_iif; | |
393 | } | |
394 | #endif /* CONFIG_NET_CLS_IND */ | |
395 | ||
396 | struct tc_cls_u32_knode { | |
397 | struct tcf_exts *exts; | |
398 | struct tc_u32_sel *sel; | |
399 | u32 handle; | |
400 | u32 val; | |
401 | u32 mask; | |
402 | u32 link_handle; | |
403 | u8 fshift; | |
404 | }; | |
405 | ||
406 | struct tc_cls_u32_hnode { | |
407 | u32 handle; | |
408 | u32 prio; | |
409 | unsigned int divisor; | |
410 | }; | |
411 | ||
412 | enum tc_clsu32_command { | |
413 | TC_CLSU32_NEW_KNODE, | |
414 | TC_CLSU32_REPLACE_KNODE, | |
415 | TC_CLSU32_DELETE_KNODE, | |
416 | TC_CLSU32_NEW_HNODE, | |
417 | TC_CLSU32_REPLACE_HNODE, | |
418 | TC_CLSU32_DELETE_HNODE, | |
419 | }; | |
420 | ||
421 | struct tc_cls_u32_offload { | |
422 | /* knode values */ | |
423 | enum tc_clsu32_command command; | |
424 | union { | |
425 | struct tc_cls_u32_knode knode; | |
426 | struct tc_cls_u32_hnode hnode; | |
427 | }; | |
428 | }; | |
429 | ||
430 | static inline bool tc_can_offload(const struct net_device *dev, | |
431 | const struct tcf_proto *tp) | |
432 | { | |
433 | const struct Qdisc *sch = tp->q; | |
434 | const struct Qdisc_class_ops *cops = sch->ops->cl_ops; | |
435 | ||
436 | if (!(dev->features & NETIF_F_HW_TC)) | |
437 | return false; | |
438 | if (!dev->netdev_ops->ndo_setup_tc) | |
439 | return false; | |
440 | if (cops && cops->tcf_cl_offload) | |
441 | return cops->tcf_cl_offload(tp->classid); | |
442 | ||
443 | return true; | |
444 | } | |
445 | ||
446 | static inline bool tc_skip_hw(u32 flags) | |
447 | { | |
448 | return (flags & TCA_CLS_FLAGS_SKIP_HW) ? true : false; | |
449 | } | |
450 | ||
451 | static inline bool tc_should_offload(const struct net_device *dev, | |
452 | const struct tcf_proto *tp, u32 flags) | |
453 | { | |
454 | if (tc_skip_hw(flags)) | |
455 | return false; | |
456 | return tc_can_offload(dev, tp); | |
457 | } | |
458 | ||
459 | static inline bool tc_skip_sw(u32 flags) | |
460 | { | |
461 | return (flags & TCA_CLS_FLAGS_SKIP_SW) ? true : false; | |
462 | } | |
463 | ||
464 | /* SKIP_HW and SKIP_SW are mutually exclusive flags. */ | |
465 | static inline bool tc_flags_valid(u32 flags) | |
466 | { | |
467 | if (flags & ~(TCA_CLS_FLAGS_SKIP_HW | TCA_CLS_FLAGS_SKIP_SW)) | |
468 | return false; | |
469 | ||
470 | if (!(flags ^ (TCA_CLS_FLAGS_SKIP_HW | TCA_CLS_FLAGS_SKIP_SW))) | |
471 | return false; | |
472 | ||
473 | return true; | |
474 | } | |
475 | ||
476 | enum tc_fl_command { | |
477 | TC_CLSFLOWER_REPLACE, | |
478 | TC_CLSFLOWER_DESTROY, | |
479 | TC_CLSFLOWER_STATS, | |
480 | }; | |
481 | ||
482 | struct tc_cls_flower_offload { | |
483 | enum tc_fl_command command; | |
484 | u32 prio; | |
485 | unsigned long cookie; | |
486 | struct flow_dissector *dissector; | |
487 | struct fl_flow_key *mask; | |
488 | struct fl_flow_key *key; | |
489 | struct tcf_exts *exts; | |
490 | }; | |
491 | ||
492 | enum tc_matchall_command { | |
493 | TC_CLSMATCHALL_REPLACE, | |
494 | TC_CLSMATCHALL_DESTROY, | |
495 | }; | |
496 | ||
497 | struct tc_cls_matchall_offload { | |
498 | enum tc_matchall_command command; | |
499 | struct tcf_exts *exts; | |
500 | unsigned long cookie; | |
501 | }; | |
502 | ||
503 | enum tc_clsbpf_command { | |
504 | TC_CLSBPF_ADD, | |
505 | TC_CLSBPF_REPLACE, | |
506 | TC_CLSBPF_DESTROY, | |
507 | TC_CLSBPF_STATS, | |
508 | }; | |
509 | ||
510 | struct tc_cls_bpf_offload { | |
511 | enum tc_clsbpf_command command; | |
512 | struct tcf_exts *exts; | |
513 | struct bpf_prog *prog; | |
514 | const char *name; | |
515 | bool exts_integrated; | |
516 | u32 gen_flags; | |
517 | }; | |
518 | ||
519 | ||
520 | /* This structure holds cookie structure that is passed from user | |
521 | * to the kernel for actions and classifiers | |
522 | */ | |
523 | struct tc_cookie { | |
524 | u8 *data; | |
525 | u32 len; | |
526 | }; | |
527 | #endif |