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1da177e4 LT |
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 | { | |
12 | int stop; | |
13 | int skip; | |
14 | int count; | |
15 | int (*fn)(struct tcf_proto *, unsigned long node, struct tcf_walker *); | |
16 | }; | |
17 | ||
18 | extern int register_tcf_proto_ops(struct tcf_proto_ops *ops); | |
19 | extern int unregister_tcf_proto_ops(struct tcf_proto_ops *ops); | |
20 | ||
21 | static inline unsigned long | |
22 | __cls_set_class(unsigned long *clp, unsigned long cl) | |
23 | { | |
24 | unsigned long old_cl; | |
25 | ||
26 | old_cl = *clp; | |
27 | *clp = cl; | |
28 | return old_cl; | |
29 | } | |
30 | ||
31 | static inline unsigned long | |
32 | cls_set_class(struct tcf_proto *tp, unsigned long *clp, | |
33 | unsigned long cl) | |
34 | { | |
35 | unsigned long old_cl; | |
36 | ||
37 | tcf_tree_lock(tp); | |
38 | old_cl = __cls_set_class(clp, cl); | |
39 | tcf_tree_unlock(tp); | |
40 | ||
41 | return old_cl; | |
42 | } | |
43 | ||
44 | static inline void | |
45 | tcf_bind_filter(struct tcf_proto *tp, struct tcf_result *r, unsigned long base) | |
46 | { | |
47 | unsigned long cl; | |
48 | ||
49 | cl = tp->q->ops->cl_ops->bind_tcf(tp->q, base, r->classid); | |
50 | cl = cls_set_class(tp, &r->class, cl); | |
51 | if (cl) | |
52 | tp->q->ops->cl_ops->unbind_tcf(tp->q, cl); | |
53 | } | |
54 | ||
55 | static inline void | |
56 | tcf_unbind_filter(struct tcf_proto *tp, struct tcf_result *r) | |
57 | { | |
58 | unsigned long cl; | |
59 | ||
60 | if ((cl = __cls_set_class(&r->class, 0)) != 0) | |
61 | tp->q->ops->cl_ops->unbind_tcf(tp->q, cl); | |
62 | } | |
63 | ||
64 | struct tcf_exts | |
65 | { | |
66 | #ifdef CONFIG_NET_CLS_ACT | |
67 | struct tc_action *action; | |
68 | #elif defined CONFIG_NET_CLS_POLICE | |
69 | struct tcf_police *police; | |
70 | #endif | |
71 | }; | |
72 | ||
73 | /* Map to export classifier specific extension TLV types to the | |
74 | * generic extensions API. Unsupported extensions must be set to 0. | |
75 | */ | |
76 | struct tcf_ext_map | |
77 | { | |
78 | int action; | |
79 | int police; | |
80 | }; | |
81 | ||
82 | /** | |
83 | * tcf_exts_is_predicative - check if a predicative extension is present | |
84 | * @exts: tc filter extensions handle | |
85 | * | |
86 | * Returns 1 if a predicative extension is present, i.e. an extension which | |
87 | * might cause further actions and thus overrule the regular tcf_result. | |
88 | */ | |
89 | static inline int | |
90 | tcf_exts_is_predicative(struct tcf_exts *exts) | |
91 | { | |
92 | #ifdef CONFIG_NET_CLS_ACT | |
93 | return !!exts->action; | |
94 | #elif defined CONFIG_NET_CLS_POLICE | |
95 | return !!exts->police; | |
96 | #else | |
97 | return 0; | |
98 | #endif | |
99 | } | |
100 | ||
101 | /** | |
102 | * tcf_exts_is_available - check if at least one extension is present | |
103 | * @exts: tc filter extensions handle | |
104 | * | |
105 | * Returns 1 if at least one extension is present. | |
106 | */ | |
107 | static inline int | |
108 | tcf_exts_is_available(struct tcf_exts *exts) | |
109 | { | |
110 | /* All non-predicative extensions must be added here. */ | |
111 | return tcf_exts_is_predicative(exts); | |
112 | } | |
113 | ||
114 | /** | |
115 | * tcf_exts_exec - execute tc filter extensions | |
116 | * @skb: socket buffer | |
117 | * @exts: tc filter extensions handle | |
118 | * @res: desired result | |
119 | * | |
120 | * Executes all configured extensions. Returns 0 on a normal execution, | |
121 | * a negative number if the filter must be considered unmatched or | |
122 | * a positive action code (TC_ACT_*) which must be returned to the | |
123 | * underlying layer. | |
124 | */ | |
125 | static inline int | |
126 | tcf_exts_exec(struct sk_buff *skb, struct tcf_exts *exts, | |
127 | struct tcf_result *res) | |
128 | { | |
129 | #ifdef CONFIG_NET_CLS_ACT | |
130 | if (exts->action) | |
131 | return tcf_action_exec(skb, exts->action, res); | |
132 | #elif defined CONFIG_NET_CLS_POLICE | |
133 | if (exts->police) | |
134 | return tcf_police(skb, exts->police); | |
135 | #endif | |
136 | ||
137 | return 0; | |
138 | } | |
139 | ||
140 | extern int tcf_exts_validate(struct tcf_proto *tp, struct rtattr **tb, | |
141 | struct rtattr *rate_tlv, struct tcf_exts *exts, | |
142 | struct tcf_ext_map *map); | |
143 | extern void tcf_exts_destroy(struct tcf_proto *tp, struct tcf_exts *exts); | |
144 | extern void tcf_exts_change(struct tcf_proto *tp, struct tcf_exts *dst, | |
145 | struct tcf_exts *src); | |
146 | extern int tcf_exts_dump(struct sk_buff *skb, struct tcf_exts *exts, | |
147 | struct tcf_ext_map *map); | |
148 | extern int tcf_exts_dump_stats(struct sk_buff *skb, struct tcf_exts *exts, | |
149 | struct tcf_ext_map *map); | |
150 | ||
151 | /** | |
152 | * struct tcf_pkt_info - packet information | |
153 | */ | |
154 | struct tcf_pkt_info | |
155 | { | |
156 | unsigned char * ptr; | |
157 | int nexthdr; | |
158 | }; | |
159 | ||
160 | #ifdef CONFIG_NET_EMATCH | |
161 | ||
162 | struct tcf_ematch_ops; | |
163 | ||
164 | /** | |
165 | * struct tcf_ematch - extended match (ematch) | |
166 | * | |
167 | * @matchid: identifier to allow userspace to reidentify a match | |
168 | * @flags: flags specifying attributes and the relation to other matches | |
169 | * @ops: the operations lookup table of the corresponding ematch module | |
170 | * @datalen: length of the ematch specific configuration data | |
171 | * @data: ematch specific data | |
172 | */ | |
173 | struct tcf_ematch | |
174 | { | |
175 | struct tcf_ematch_ops * ops; | |
176 | unsigned long data; | |
177 | unsigned int datalen; | |
178 | u16 matchid; | |
179 | u16 flags; | |
180 | }; | |
181 | ||
182 | static inline int tcf_em_is_container(struct tcf_ematch *em) | |
183 | { | |
184 | return !em->ops; | |
185 | } | |
186 | ||
187 | static inline int tcf_em_is_simple(struct tcf_ematch *em) | |
188 | { | |
189 | return em->flags & TCF_EM_SIMPLE; | |
190 | } | |
191 | ||
192 | static inline int tcf_em_is_inverted(struct tcf_ematch *em) | |
193 | { | |
194 | return em->flags & TCF_EM_INVERT; | |
195 | } | |
196 | ||
197 | static inline int tcf_em_last_match(struct tcf_ematch *em) | |
198 | { | |
199 | return (em->flags & TCF_EM_REL_MASK) == TCF_EM_REL_END; | |
200 | } | |
201 | ||
202 | static inline int tcf_em_early_end(struct tcf_ematch *em, int result) | |
203 | { | |
204 | if (tcf_em_last_match(em)) | |
205 | return 1; | |
206 | ||
207 | if (result == 0 && em->flags & TCF_EM_REL_AND) | |
208 | return 1; | |
209 | ||
210 | if (result != 0 && em->flags & TCF_EM_REL_OR) | |
211 | return 1; | |
212 | ||
213 | return 0; | |
214 | } | |
215 | ||
216 | /** | |
217 | * struct tcf_ematch_tree - ematch tree handle | |
218 | * | |
219 | * @hdr: ematch tree header supplied by userspace | |
220 | * @matches: array of ematches | |
221 | */ | |
222 | struct tcf_ematch_tree | |
223 | { | |
224 | struct tcf_ematch_tree_hdr hdr; | |
225 | struct tcf_ematch * matches; | |
226 | ||
227 | }; | |
228 | ||
229 | /** | |
230 | * struct tcf_ematch_ops - ematch module operations | |
231 | * | |
232 | * @kind: identifier (kind) of this ematch module | |
233 | * @datalen: length of expected configuration data (optional) | |
234 | * @change: called during validation (optional) | |
235 | * @match: called during ematch tree evaluation, must return 1/0 | |
236 | * @destroy: called during destroyage (optional) | |
237 | * @dump: called during dumping process (optional) | |
238 | * @owner: owner, must be set to THIS_MODULE | |
239 | * @link: link to previous/next ematch module (internal use) | |
240 | */ | |
241 | struct tcf_ematch_ops | |
242 | { | |
243 | int kind; | |
244 | int datalen; | |
245 | int (*change)(struct tcf_proto *, void *, | |
246 | int, struct tcf_ematch *); | |
247 | int (*match)(struct sk_buff *, struct tcf_ematch *, | |
248 | struct tcf_pkt_info *); | |
249 | void (*destroy)(struct tcf_proto *, | |
250 | struct tcf_ematch *); | |
251 | int (*dump)(struct sk_buff *, struct tcf_ematch *); | |
252 | struct module *owner; | |
253 | struct list_head link; | |
254 | }; | |
255 | ||
256 | extern int tcf_em_register(struct tcf_ematch_ops *); | |
257 | extern int tcf_em_unregister(struct tcf_ematch_ops *); | |
258 | extern int tcf_em_tree_validate(struct tcf_proto *, struct rtattr *, | |
259 | struct tcf_ematch_tree *); | |
260 | extern void tcf_em_tree_destroy(struct tcf_proto *, struct tcf_ematch_tree *); | |
261 | extern int tcf_em_tree_dump(struct sk_buff *, struct tcf_ematch_tree *, int); | |
262 | extern int __tcf_em_tree_match(struct sk_buff *, struct tcf_ematch_tree *, | |
263 | struct tcf_pkt_info *); | |
264 | ||
265 | /** | |
266 | * tcf_em_tree_change - replace ematch tree of a running classifier | |
267 | * | |
268 | * @tp: classifier kind handle | |
269 | * @dst: destination ematch tree variable | |
270 | * @src: source ematch tree (temporary tree from tcf_em_tree_validate) | |
271 | * | |
272 | * This functions replaces the ematch tree in @dst with the ematch | |
273 | * tree in @src. The classifier in charge of the ematch tree may be | |
274 | * running. | |
275 | */ | |
276 | static inline void tcf_em_tree_change(struct tcf_proto *tp, | |
277 | struct tcf_ematch_tree *dst, | |
278 | struct tcf_ematch_tree *src) | |
279 | { | |
280 | tcf_tree_lock(tp); | |
281 | memcpy(dst, src, sizeof(*dst)); | |
282 | tcf_tree_unlock(tp); | |
283 | } | |
284 | ||
285 | /** | |
286 | * tcf_em_tree_match - evaulate an ematch tree | |
287 | * | |
288 | * @skb: socket buffer of the packet in question | |
289 | * @tree: ematch tree to be used for evaluation | |
290 | * @info: packet information examined by classifier | |
291 | * | |
292 | * This function matches @skb against the ematch tree in @tree by going | |
293 | * through all ematches respecting their logic relations returning | |
294 | * as soon as the result is obvious. | |
295 | * | |
296 | * Returns 1 if the ematch tree as-one matches, no ematches are configured | |
297 | * or ematch is not enabled in the kernel, otherwise 0 is returned. | |
298 | */ | |
299 | static inline int tcf_em_tree_match(struct sk_buff *skb, | |
300 | struct tcf_ematch_tree *tree, | |
301 | struct tcf_pkt_info *info) | |
302 | { | |
303 | if (tree->hdr.nmatches) | |
304 | return __tcf_em_tree_match(skb, tree, info); | |
305 | else | |
306 | return 1; | |
307 | } | |
308 | ||
309 | #else /* CONFIG_NET_EMATCH */ | |
310 | ||
311 | struct tcf_ematch_tree | |
312 | { | |
313 | }; | |
314 | ||
315 | #define tcf_em_tree_validate(tp, tb, t) ((void)(t), 0) | |
316 | #define tcf_em_tree_destroy(tp, t) do { (void)(t); } while(0) | |
317 | #define tcf_em_tree_dump(skb, t, tlv) (0) | |
318 | #define tcf_em_tree_change(tp, dst, src) do { } while(0) | |
319 | #define tcf_em_tree_match(skb, t, info) ((void)(info), 1) | |
320 | ||
321 | #endif /* CONFIG_NET_EMATCH */ | |
322 | ||
323 | static inline unsigned char * tcf_get_base_ptr(struct sk_buff *skb, int layer) | |
324 | { | |
325 | switch (layer) { | |
326 | case TCF_LAYER_LINK: | |
327 | return skb->data; | |
328 | case TCF_LAYER_NETWORK: | |
329 | return skb->nh.raw; | |
330 | case TCF_LAYER_TRANSPORT: | |
331 | return skb->h.raw; | |
332 | } | |
333 | ||
334 | return NULL; | |
335 | } | |
336 | ||
337 | static inline int tcf_valid_offset(struct sk_buff *skb, unsigned char *ptr, | |
338 | int len) | |
339 | { | |
340 | return unlikely((ptr + len) < skb->tail && ptr > skb->head); | |
341 | } | |
342 | ||
343 | #ifdef CONFIG_NET_CLS_IND | |
344 | static inline int | |
345 | tcf_change_indev(struct tcf_proto *tp, char *indev, struct rtattr *indev_tlv) | |
346 | { | |
347 | if (rtattr_strlcpy(indev, indev_tlv, IFNAMSIZ) >= IFNAMSIZ) | |
348 | return -EINVAL; | |
349 | return 0; | |
350 | } | |
351 | ||
352 | static inline int | |
353 | tcf_match_indev(struct sk_buff *skb, char *indev) | |
354 | { | |
86e65da9 DM |
355 | if (indev[0]) { |
356 | if (!skb->input_dev) | |
1da177e4 | 357 | return 0; |
86e65da9 | 358 | if (strcmp(indev, skb->input_dev->name)) |
1da177e4 LT |
359 | return 0; |
360 | } | |
361 | ||
362 | return 1; | |
363 | } | |
364 | #endif /* CONFIG_NET_CLS_IND */ | |
365 | ||
366 | #endif |