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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> | |
881d966b | 5 | #include <net/net_namespace.h> |
1da177e4 LT |
6 | #include <net/sch_generic.h> |
7 | #include <net/act_api.h> | |
8 | ||
9 | /* Basic packet classifier frontend definitions. */ | |
10 | ||
11 | struct tcf_walker | |
12 | { | |
13 | int stop; | |
14 | int skip; | |
15 | int count; | |
16 | int (*fn)(struct tcf_proto *, unsigned long node, struct tcf_walker *); | |
17 | }; | |
18 | ||
19 | extern int register_tcf_proto_ops(struct tcf_proto_ops *ops); | |
20 | extern int unregister_tcf_proto_ops(struct tcf_proto_ops *ops); | |
21 | ||
22 | static inline unsigned long | |
23 | __cls_set_class(unsigned long *clp, unsigned long cl) | |
24 | { | |
25 | unsigned long old_cl; | |
26 | ||
27 | old_cl = *clp; | |
28 | *clp = cl; | |
29 | return old_cl; | |
30 | } | |
31 | ||
32 | static inline unsigned long | |
33 | cls_set_class(struct tcf_proto *tp, unsigned long *clp, | |
34 | unsigned long cl) | |
35 | { | |
36 | unsigned long old_cl; | |
37 | ||
38 | tcf_tree_lock(tp); | |
39 | old_cl = __cls_set_class(clp, cl); | |
40 | tcf_tree_unlock(tp); | |
41 | ||
42 | return old_cl; | |
43 | } | |
44 | ||
45 | static inline void | |
46 | tcf_bind_filter(struct tcf_proto *tp, struct tcf_result *r, unsigned long base) | |
47 | { | |
48 | unsigned long cl; | |
49 | ||
50 | cl = tp->q->ops->cl_ops->bind_tcf(tp->q, base, r->classid); | |
51 | cl = cls_set_class(tp, &r->class, cl); | |
52 | if (cl) | |
53 | tp->q->ops->cl_ops->unbind_tcf(tp->q, cl); | |
54 | } | |
55 | ||
56 | static inline void | |
57 | tcf_unbind_filter(struct tcf_proto *tp, struct tcf_result *r) | |
58 | { | |
59 | unsigned long cl; | |
60 | ||
61 | if ((cl = __cls_set_class(&r->class, 0)) != 0) | |
62 | tp->q->ops->cl_ops->unbind_tcf(tp->q, cl); | |
63 | } | |
64 | ||
65 | struct tcf_exts | |
66 | { | |
67 | #ifdef CONFIG_NET_CLS_ACT | |
68 | struct tc_action *action; | |
1da177e4 LT |
69 | #endif |
70 | }; | |
71 | ||
72 | /* Map to export classifier specific extension TLV types to the | |
73 | * generic extensions API. Unsupported extensions must be set to 0. | |
74 | */ | |
75 | struct tcf_ext_map | |
76 | { | |
77 | int action; | |
78 | int police; | |
79 | }; | |
80 | ||
81 | /** | |
82 | * tcf_exts_is_predicative - check if a predicative extension is present | |
83 | * @exts: tc filter extensions handle | |
84 | * | |
85 | * Returns 1 if a predicative extension is present, i.e. an extension which | |
86 | * might cause further actions and thus overrule the regular tcf_result. | |
87 | */ | |
88 | static inline int | |
89 | tcf_exts_is_predicative(struct tcf_exts *exts) | |
90 | { | |
91 | #ifdef CONFIG_NET_CLS_ACT | |
92 | return !!exts->action; | |
1da177e4 LT |
93 | #else |
94 | return 0; | |
95 | #endif | |
96 | } | |
97 | ||
98 | /** | |
99 | * tcf_exts_is_available - check if at least one extension is present | |
100 | * @exts: tc filter extensions handle | |
101 | * | |
102 | * Returns 1 if at least one extension is present. | |
103 | */ | |
104 | static inline int | |
105 | tcf_exts_is_available(struct tcf_exts *exts) | |
106 | { | |
107 | /* All non-predicative extensions must be added here. */ | |
108 | return tcf_exts_is_predicative(exts); | |
109 | } | |
110 | ||
111 | /** | |
112 | * tcf_exts_exec - execute tc filter extensions | |
113 | * @skb: socket buffer | |
114 | * @exts: tc filter extensions handle | |
115 | * @res: desired result | |
116 | * | |
117 | * Executes all configured extensions. Returns 0 on a normal execution, | |
118 | * a negative number if the filter must be considered unmatched or | |
119 | * a positive action code (TC_ACT_*) which must be returned to the | |
120 | * underlying layer. | |
121 | */ | |
122 | static inline int | |
123 | tcf_exts_exec(struct sk_buff *skb, struct tcf_exts *exts, | |
124 | struct tcf_result *res) | |
125 | { | |
126 | #ifdef CONFIG_NET_CLS_ACT | |
127 | if (exts->action) | |
128 | return tcf_action_exec(skb, exts->action, res); | |
1da177e4 | 129 | #endif |
1da177e4 LT |
130 | return 0; |
131 | } | |
132 | ||
133 | extern int tcf_exts_validate(struct tcf_proto *tp, struct rtattr **tb, | |
134 | struct rtattr *rate_tlv, struct tcf_exts *exts, | |
135 | struct tcf_ext_map *map); | |
136 | extern void tcf_exts_destroy(struct tcf_proto *tp, struct tcf_exts *exts); | |
137 | extern void tcf_exts_change(struct tcf_proto *tp, struct tcf_exts *dst, | |
138 | struct tcf_exts *src); | |
139 | extern int tcf_exts_dump(struct sk_buff *skb, struct tcf_exts *exts, | |
140 | struct tcf_ext_map *map); | |
141 | extern int tcf_exts_dump_stats(struct sk_buff *skb, struct tcf_exts *exts, | |
142 | struct tcf_ext_map *map); | |
143 | ||
144 | /** | |
145 | * struct tcf_pkt_info - packet information | |
146 | */ | |
147 | struct tcf_pkt_info | |
148 | { | |
149 | unsigned char * ptr; | |
150 | int nexthdr; | |
151 | }; | |
152 | ||
153 | #ifdef CONFIG_NET_EMATCH | |
154 | ||
155 | struct tcf_ematch_ops; | |
156 | ||
157 | /** | |
158 | * struct tcf_ematch - extended match (ematch) | |
159 | * | |
160 | * @matchid: identifier to allow userspace to reidentify a match | |
161 | * @flags: flags specifying attributes and the relation to other matches | |
162 | * @ops: the operations lookup table of the corresponding ematch module | |
163 | * @datalen: length of the ematch specific configuration data | |
164 | * @data: ematch specific data | |
165 | */ | |
166 | struct tcf_ematch | |
167 | { | |
168 | struct tcf_ematch_ops * ops; | |
169 | unsigned long data; | |
170 | unsigned int datalen; | |
171 | u16 matchid; | |
172 | u16 flags; | |
173 | }; | |
174 | ||
175 | static inline int tcf_em_is_container(struct tcf_ematch *em) | |
176 | { | |
177 | return !em->ops; | |
178 | } | |
179 | ||
180 | static inline int tcf_em_is_simple(struct tcf_ematch *em) | |
181 | { | |
182 | return em->flags & TCF_EM_SIMPLE; | |
183 | } | |
184 | ||
185 | static inline int tcf_em_is_inverted(struct tcf_ematch *em) | |
186 | { | |
187 | return em->flags & TCF_EM_INVERT; | |
188 | } | |
189 | ||
190 | static inline int tcf_em_last_match(struct tcf_ematch *em) | |
191 | { | |
192 | return (em->flags & TCF_EM_REL_MASK) == TCF_EM_REL_END; | |
193 | } | |
194 | ||
195 | static inline int tcf_em_early_end(struct tcf_ematch *em, int result) | |
196 | { | |
197 | if (tcf_em_last_match(em)) | |
198 | return 1; | |
199 | ||
200 | if (result == 0 && em->flags & TCF_EM_REL_AND) | |
201 | return 1; | |
202 | ||
203 | if (result != 0 && em->flags & TCF_EM_REL_OR) | |
204 | return 1; | |
205 | ||
206 | return 0; | |
207 | } | |
208 | ||
209 | /** | |
210 | * struct tcf_ematch_tree - ematch tree handle | |
211 | * | |
212 | * @hdr: ematch tree header supplied by userspace | |
213 | * @matches: array of ematches | |
214 | */ | |
215 | struct tcf_ematch_tree | |
216 | { | |
217 | struct tcf_ematch_tree_hdr hdr; | |
218 | struct tcf_ematch * matches; | |
219 | ||
220 | }; | |
221 | ||
222 | /** | |
223 | * struct tcf_ematch_ops - ematch module operations | |
224 | * | |
225 | * @kind: identifier (kind) of this ematch module | |
226 | * @datalen: length of expected configuration data (optional) | |
227 | * @change: called during validation (optional) | |
228 | * @match: called during ematch tree evaluation, must return 1/0 | |
229 | * @destroy: called during destroyage (optional) | |
230 | * @dump: called during dumping process (optional) | |
231 | * @owner: owner, must be set to THIS_MODULE | |
232 | * @link: link to previous/next ematch module (internal use) | |
233 | */ | |
234 | struct tcf_ematch_ops | |
235 | { | |
236 | int kind; | |
237 | int datalen; | |
238 | int (*change)(struct tcf_proto *, void *, | |
239 | int, struct tcf_ematch *); | |
240 | int (*match)(struct sk_buff *, struct tcf_ematch *, | |
241 | struct tcf_pkt_info *); | |
242 | void (*destroy)(struct tcf_proto *, | |
243 | struct tcf_ematch *); | |
244 | int (*dump)(struct sk_buff *, struct tcf_ematch *); | |
245 | struct module *owner; | |
246 | struct list_head link; | |
247 | }; | |
248 | ||
249 | extern int tcf_em_register(struct tcf_ematch_ops *); | |
250 | extern int tcf_em_unregister(struct tcf_ematch_ops *); | |
251 | extern int tcf_em_tree_validate(struct tcf_proto *, struct rtattr *, | |
252 | struct tcf_ematch_tree *); | |
253 | extern void tcf_em_tree_destroy(struct tcf_proto *, struct tcf_ematch_tree *); | |
254 | extern int tcf_em_tree_dump(struct sk_buff *, struct tcf_ematch_tree *, int); | |
255 | extern int __tcf_em_tree_match(struct sk_buff *, struct tcf_ematch_tree *, | |
256 | struct tcf_pkt_info *); | |
257 | ||
258 | /** | |
259 | * tcf_em_tree_change - replace ematch tree of a running classifier | |
260 | * | |
261 | * @tp: classifier kind handle | |
262 | * @dst: destination ematch tree variable | |
263 | * @src: source ematch tree (temporary tree from tcf_em_tree_validate) | |
264 | * | |
265 | * This functions replaces the ematch tree in @dst with the ematch | |
266 | * tree in @src. The classifier in charge of the ematch tree may be | |
267 | * running. | |
268 | */ | |
269 | static inline void tcf_em_tree_change(struct tcf_proto *tp, | |
270 | struct tcf_ematch_tree *dst, | |
271 | struct tcf_ematch_tree *src) | |
272 | { | |
273 | tcf_tree_lock(tp); | |
274 | memcpy(dst, src, sizeof(*dst)); | |
275 | tcf_tree_unlock(tp); | |
276 | } | |
277 | ||
278 | /** | |
279 | * tcf_em_tree_match - evaulate an ematch tree | |
280 | * | |
281 | * @skb: socket buffer of the packet in question | |
282 | * @tree: ematch tree to be used for evaluation | |
283 | * @info: packet information examined by classifier | |
284 | * | |
285 | * This function matches @skb against the ematch tree in @tree by going | |
286 | * through all ematches respecting their logic relations returning | |
287 | * as soon as the result is obvious. | |
288 | * | |
289 | * Returns 1 if the ematch tree as-one matches, no ematches are configured | |
290 | * or ematch is not enabled in the kernel, otherwise 0 is returned. | |
291 | */ | |
292 | static inline int tcf_em_tree_match(struct sk_buff *skb, | |
293 | struct tcf_ematch_tree *tree, | |
294 | struct tcf_pkt_info *info) | |
295 | { | |
296 | if (tree->hdr.nmatches) | |
297 | return __tcf_em_tree_match(skb, tree, info); | |
298 | else | |
299 | return 1; | |
300 | } | |
301 | ||
db3d99c0 PM |
302 | #define MODULE_ALIAS_TCF_EMATCH(kind) MODULE_ALIAS("ematch-kind-" __stringify(kind)) |
303 | ||
1da177e4 LT |
304 | #else /* CONFIG_NET_EMATCH */ |
305 | ||
306 | struct tcf_ematch_tree | |
307 | { | |
308 | }; | |
309 | ||
310 | #define tcf_em_tree_validate(tp, tb, t) ((void)(t), 0) | |
311 | #define tcf_em_tree_destroy(tp, t) do { (void)(t); } while(0) | |
312 | #define tcf_em_tree_dump(skb, t, tlv) (0) | |
313 | #define tcf_em_tree_change(tp, dst, src) do { } while(0) | |
314 | #define tcf_em_tree_match(skb, t, info) ((void)(info), 1) | |
315 | ||
316 | #endif /* CONFIG_NET_EMATCH */ | |
317 | ||
318 | static inline unsigned char * tcf_get_base_ptr(struct sk_buff *skb, int layer) | |
319 | { | |
320 | switch (layer) { | |
321 | case TCF_LAYER_LINK: | |
322 | return skb->data; | |
323 | case TCF_LAYER_NETWORK: | |
d56f90a7 | 324 | return skb_network_header(skb); |
1da177e4 | 325 | case TCF_LAYER_TRANSPORT: |
9c70220b | 326 | return skb_transport_header(skb); |
1da177e4 LT |
327 | } |
328 | ||
329 | return NULL; | |
330 | } | |
331 | ||
eddc9ec5 ACM |
332 | static inline int tcf_valid_offset(const struct sk_buff *skb, |
333 | const unsigned char *ptr, const int len) | |
1da177e4 | 334 | { |
27a884dc | 335 | return unlikely((ptr + len) < skb_tail_pointer(skb) && ptr > skb->head); |
1da177e4 LT |
336 | } |
337 | ||
338 | #ifdef CONFIG_NET_CLS_IND | |
339 | static inline int | |
340 | tcf_change_indev(struct tcf_proto *tp, char *indev, struct rtattr *indev_tlv) | |
341 | { | |
342 | if (rtattr_strlcpy(indev, indev_tlv, IFNAMSIZ) >= IFNAMSIZ) | |
343 | return -EINVAL; | |
344 | return 0; | |
345 | } | |
346 | ||
347 | static inline int | |
348 | tcf_match_indev(struct sk_buff *skb, char *indev) | |
349 | { | |
c01003c2 PM |
350 | struct net_device *dev; |
351 | ||
86e65da9 | 352 | if (indev[0]) { |
c01003c2 | 353 | if (!skb->iif) |
1da177e4 | 354 | return 0; |
881d966b | 355 | dev = __dev_get_by_index(&init_net, skb->iif); |
c01003c2 | 356 | if (!dev || strcmp(indev, dev->name)) |
1da177e4 LT |
357 | return 0; |
358 | } | |
359 | ||
360 | return 1; | |
361 | } | |
362 | #endif /* CONFIG_NET_CLS_IND */ | |
363 | ||
364 | #endif |