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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; | |
1da177e4 LT |
68 | #endif |
69 | }; | |
70 | ||
71 | /* Map to export classifier specific extension TLV types to the | |
72 | * generic extensions API. Unsupported extensions must be set to 0. | |
73 | */ | |
74 | struct tcf_ext_map | |
75 | { | |
76 | int action; | |
77 | int police; | |
78 | }; | |
79 | ||
80 | /** | |
81 | * tcf_exts_is_predicative - check if a predicative extension is present | |
82 | * @exts: tc filter extensions handle | |
83 | * | |
84 | * Returns 1 if a predicative extension is present, i.e. an extension which | |
85 | * might cause further actions and thus overrule the regular tcf_result. | |
86 | */ | |
87 | static inline int | |
88 | tcf_exts_is_predicative(struct tcf_exts *exts) | |
89 | { | |
90 | #ifdef CONFIG_NET_CLS_ACT | |
91 | return !!exts->action; | |
1da177e4 LT |
92 | #else |
93 | return 0; | |
94 | #endif | |
95 | } | |
96 | ||
97 | /** | |
98 | * tcf_exts_is_available - check if at least one extension is present | |
99 | * @exts: tc filter extensions handle | |
100 | * | |
101 | * Returns 1 if at least one extension is present. | |
102 | */ | |
103 | static inline int | |
104 | tcf_exts_is_available(struct tcf_exts *exts) | |
105 | { | |
106 | /* All non-predicative extensions must be added here. */ | |
107 | return tcf_exts_is_predicative(exts); | |
108 | } | |
109 | ||
110 | /** | |
111 | * tcf_exts_exec - execute tc filter extensions | |
112 | * @skb: socket buffer | |
113 | * @exts: tc filter extensions handle | |
114 | * @res: desired result | |
115 | * | |
116 | * Executes all configured extensions. Returns 0 on a normal execution, | |
117 | * a negative number if the filter must be considered unmatched or | |
118 | * a positive action code (TC_ACT_*) which must be returned to the | |
119 | * underlying layer. | |
120 | */ | |
121 | static inline int | |
122 | tcf_exts_exec(struct sk_buff *skb, struct tcf_exts *exts, | |
123 | struct tcf_result *res) | |
124 | { | |
125 | #ifdef CONFIG_NET_CLS_ACT | |
126 | if (exts->action) | |
127 | return tcf_action_exec(skb, exts->action, res); | |
1da177e4 | 128 | #endif |
1da177e4 LT |
129 | return 0; |
130 | } | |
131 | ||
add93b61 PM |
132 | extern int tcf_exts_validate(struct tcf_proto *tp, struct nlattr **tb, |
133 | struct nlattr *rate_tlv, struct tcf_exts *exts, | |
5239008b | 134 | const struct tcf_ext_map *map); |
1da177e4 LT |
135 | extern void tcf_exts_destroy(struct tcf_proto *tp, struct tcf_exts *exts); |
136 | extern void tcf_exts_change(struct tcf_proto *tp, struct tcf_exts *dst, | |
137 | struct tcf_exts *src); | |
138 | extern int tcf_exts_dump(struct sk_buff *skb, struct tcf_exts *exts, | |
5239008b | 139 | const struct tcf_ext_map *map); |
1da177e4 | 140 | extern int tcf_exts_dump_stats(struct sk_buff *skb, struct tcf_exts *exts, |
5239008b | 141 | const struct tcf_ext_map *map); |
1da177e4 LT |
142 | |
143 | /** | |
144 | * struct tcf_pkt_info - packet information | |
145 | */ | |
146 | struct tcf_pkt_info | |
147 | { | |
148 | unsigned char * ptr; | |
149 | int nexthdr; | |
150 | }; | |
151 | ||
152 | #ifdef CONFIG_NET_EMATCH | |
153 | ||
154 | struct tcf_ematch_ops; | |
155 | ||
156 | /** | |
157 | * struct tcf_ematch - extended match (ematch) | |
158 | * | |
159 | * @matchid: identifier to allow userspace to reidentify a match | |
160 | * @flags: flags specifying attributes and the relation to other matches | |
161 | * @ops: the operations lookup table of the corresponding ematch module | |
162 | * @datalen: length of the ematch specific configuration data | |
163 | * @data: ematch specific data | |
164 | */ | |
165 | struct tcf_ematch | |
166 | { | |
167 | struct tcf_ematch_ops * ops; | |
168 | unsigned long data; | |
169 | unsigned int datalen; | |
170 | u16 matchid; | |
171 | u16 flags; | |
172 | }; | |
173 | ||
174 | static inline int tcf_em_is_container(struct tcf_ematch *em) | |
175 | { | |
176 | return !em->ops; | |
177 | } | |
178 | ||
179 | static inline int tcf_em_is_simple(struct tcf_ematch *em) | |
180 | { | |
181 | return em->flags & TCF_EM_SIMPLE; | |
182 | } | |
183 | ||
184 | static inline int tcf_em_is_inverted(struct tcf_ematch *em) | |
185 | { | |
186 | return em->flags & TCF_EM_INVERT; | |
187 | } | |
188 | ||
189 | static inline int tcf_em_last_match(struct tcf_ematch *em) | |
190 | { | |
191 | return (em->flags & TCF_EM_REL_MASK) == TCF_EM_REL_END; | |
192 | } | |
193 | ||
194 | static inline int tcf_em_early_end(struct tcf_ematch *em, int result) | |
195 | { | |
196 | if (tcf_em_last_match(em)) | |
197 | return 1; | |
198 | ||
199 | if (result == 0 && em->flags & TCF_EM_REL_AND) | |
200 | return 1; | |
201 | ||
202 | if (result != 0 && em->flags & TCF_EM_REL_OR) | |
203 | return 1; | |
204 | ||
205 | return 0; | |
206 | } | |
207 | ||
208 | /** | |
209 | * struct tcf_ematch_tree - ematch tree handle | |
210 | * | |
211 | * @hdr: ematch tree header supplied by userspace | |
212 | * @matches: array of ematches | |
213 | */ | |
214 | struct tcf_ematch_tree | |
215 | { | |
216 | struct tcf_ematch_tree_hdr hdr; | |
217 | struct tcf_ematch * matches; | |
218 | ||
219 | }; | |
220 | ||
221 | /** | |
222 | * struct tcf_ematch_ops - ematch module operations | |
223 | * | |
224 | * @kind: identifier (kind) of this ematch module | |
225 | * @datalen: length of expected configuration data (optional) | |
226 | * @change: called during validation (optional) | |
227 | * @match: called during ematch tree evaluation, must return 1/0 | |
228 | * @destroy: called during destroyage (optional) | |
229 | * @dump: called during dumping process (optional) | |
230 | * @owner: owner, must be set to THIS_MODULE | |
231 | * @link: link to previous/next ematch module (internal use) | |
232 | */ | |
233 | struct tcf_ematch_ops | |
234 | { | |
235 | int kind; | |
236 | int datalen; | |
237 | int (*change)(struct tcf_proto *, void *, | |
238 | int, struct tcf_ematch *); | |
239 | int (*match)(struct sk_buff *, struct tcf_ematch *, | |
240 | struct tcf_pkt_info *); | |
241 | void (*destroy)(struct tcf_proto *, | |
242 | struct tcf_ematch *); | |
243 | int (*dump)(struct sk_buff *, struct tcf_ematch *); | |
244 | struct module *owner; | |
245 | struct list_head link; | |
246 | }; | |
247 | ||
248 | extern int tcf_em_register(struct tcf_ematch_ops *); | |
4d24b52a | 249 | extern void tcf_em_unregister(struct tcf_ematch_ops *); |
add93b61 | 250 | extern int tcf_em_tree_validate(struct tcf_proto *, struct nlattr *, |
1da177e4 LT |
251 | struct tcf_ematch_tree *); |
252 | extern void tcf_em_tree_destroy(struct tcf_proto *, struct tcf_ematch_tree *); | |
253 | extern int tcf_em_tree_dump(struct sk_buff *, struct tcf_ematch_tree *, int); | |
254 | extern int __tcf_em_tree_match(struct sk_buff *, struct tcf_ematch_tree *, | |
255 | struct tcf_pkt_info *); | |
256 | ||
257 | /** | |
258 | * tcf_em_tree_change - replace ematch tree of a running classifier | |
259 | * | |
260 | * @tp: classifier kind handle | |
261 | * @dst: destination ematch tree variable | |
262 | * @src: source ematch tree (temporary tree from tcf_em_tree_validate) | |
263 | * | |
264 | * This functions replaces the ematch tree in @dst with the ematch | |
265 | * tree in @src. The classifier in charge of the ematch tree may be | |
266 | * running. | |
267 | */ | |
268 | static inline void tcf_em_tree_change(struct tcf_proto *tp, | |
269 | struct tcf_ematch_tree *dst, | |
270 | struct tcf_ematch_tree *src) | |
271 | { | |
272 | tcf_tree_lock(tp); | |
273 | memcpy(dst, src, sizeof(*dst)); | |
274 | tcf_tree_unlock(tp); | |
275 | } | |
276 | ||
277 | /** | |
278 | * tcf_em_tree_match - evaulate an ematch tree | |
279 | * | |
280 | * @skb: socket buffer of the packet in question | |
281 | * @tree: ematch tree to be used for evaluation | |
282 | * @info: packet information examined by classifier | |
283 | * | |
284 | * This function matches @skb against the ematch tree in @tree by going | |
285 | * through all ematches respecting their logic relations returning | |
286 | * as soon as the result is obvious. | |
287 | * | |
288 | * Returns 1 if the ematch tree as-one matches, no ematches are configured | |
289 | * or ematch is not enabled in the kernel, otherwise 0 is returned. | |
290 | */ | |
291 | static inline int tcf_em_tree_match(struct sk_buff *skb, | |
292 | struct tcf_ematch_tree *tree, | |
293 | struct tcf_pkt_info *info) | |
294 | { | |
295 | if (tree->hdr.nmatches) | |
296 | return __tcf_em_tree_match(skb, tree, info); | |
297 | else | |
298 | return 1; | |
299 | } | |
300 | ||
db3d99c0 PM |
301 | #define MODULE_ALIAS_TCF_EMATCH(kind) MODULE_ALIAS("ematch-kind-" __stringify(kind)) |
302 | ||
1da177e4 LT |
303 | #else /* CONFIG_NET_EMATCH */ |
304 | ||
305 | struct tcf_ematch_tree | |
306 | { | |
307 | }; | |
308 | ||
309 | #define tcf_em_tree_validate(tp, tb, t) ((void)(t), 0) | |
310 | #define tcf_em_tree_destroy(tp, t) do { (void)(t); } while(0) | |
311 | #define tcf_em_tree_dump(skb, t, tlv) (0) | |
312 | #define tcf_em_tree_change(tp, dst, src) do { } while(0) | |
313 | #define tcf_em_tree_match(skb, t, info) ((void)(info), 1) | |
314 | ||
315 | #endif /* CONFIG_NET_EMATCH */ | |
316 | ||
317 | static inline unsigned char * tcf_get_base_ptr(struct sk_buff *skb, int layer) | |
318 | { | |
319 | switch (layer) { | |
320 | case TCF_LAYER_LINK: | |
321 | return skb->data; | |
322 | case TCF_LAYER_NETWORK: | |
d56f90a7 | 323 | return skb_network_header(skb); |
1da177e4 | 324 | case TCF_LAYER_TRANSPORT: |
9c70220b | 325 | return skb_transport_header(skb); |
1da177e4 LT |
326 | } |
327 | ||
328 | return NULL; | |
329 | } | |
330 | ||
eddc9ec5 ACM |
331 | static inline int tcf_valid_offset(const struct sk_buff *skb, |
332 | const unsigned char *ptr, const int len) | |
1da177e4 | 333 | { |
27a884dc | 334 | return unlikely((ptr + len) < skb_tail_pointer(skb) && ptr > skb->head); |
1da177e4 LT |
335 | } |
336 | ||
337 | #ifdef CONFIG_NET_CLS_IND | |
0eeb8ffc DL |
338 | #include <net/net_namespace.h> |
339 | ||
1da177e4 | 340 | static inline int |
add93b61 | 341 | tcf_change_indev(struct tcf_proto *tp, char *indev, struct nlattr *indev_tlv) |
1da177e4 | 342 | { |
add93b61 | 343 | if (nla_strlcpy(indev, indev_tlv, IFNAMSIZ) >= IFNAMSIZ) |
1da177e4 LT |
344 | return -EINVAL; |
345 | return 0; | |
346 | } | |
347 | ||
348 | static inline int | |
349 | tcf_match_indev(struct sk_buff *skb, char *indev) | |
350 | { | |
c01003c2 PM |
351 | struct net_device *dev; |
352 | ||
86e65da9 | 353 | if (indev[0]) { |
c01003c2 | 354 | if (!skb->iif) |
1da177e4 | 355 | return 0; |
09382bac | 356 | dev = __dev_get_by_index(dev_net(skb->dev), skb->iif); |
c01003c2 | 357 | if (!dev || strcmp(indev, dev->name)) |
1da177e4 LT |
358 | return 0; |
359 | } | |
360 | ||
361 | return 1; | |
362 | } | |
363 | #endif /* CONFIG_NET_CLS_IND */ | |
364 | ||
365 | #endif |