[PATCH] fix semaphore handling in __unregister_chrdev_region
[linux/fpc-iii.git] / include / net / pkt_cls.h
blob4abda6aec05a8cc4ca2cde35d6115427d71044fc
1 #ifndef __NET_PKT_CLS_H
2 #define __NET_PKT_CLS_H
4 #include <linux/pkt_cls.h>
5 #include <net/sch_generic.h>
6 #include <net/act_api.h>
8 /* Basic packet classifier frontend definitions. */
10 struct tcf_walker
12 int stop;
13 int skip;
14 int count;
15 int (*fn)(struct tcf_proto *, unsigned long node, struct tcf_walker *);
18 extern int register_tcf_proto_ops(struct tcf_proto_ops *ops);
19 extern int unregister_tcf_proto_ops(struct tcf_proto_ops *ops);
21 static inline unsigned long
22 __cls_set_class(unsigned long *clp, unsigned long cl)
24 unsigned long old_cl;
26 old_cl = *clp;
27 *clp = cl;
28 return old_cl;
31 static inline unsigned long
32 cls_set_class(struct tcf_proto *tp, unsigned long *clp,
33 unsigned long cl)
35 unsigned long old_cl;
37 tcf_tree_lock(tp);
38 old_cl = __cls_set_class(clp, cl);
39 tcf_tree_unlock(tp);
41 return old_cl;
44 static inline void
45 tcf_bind_filter(struct tcf_proto *tp, struct tcf_result *r, unsigned long base)
47 unsigned long cl;
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);
55 static inline void
56 tcf_unbind_filter(struct tcf_proto *tp, struct tcf_result *r)
58 unsigned long cl;
60 if ((cl = __cls_set_class(&r->class, 0)) != 0)
61 tp->q->ops->cl_ops->unbind_tcf(tp->q, cl);
64 struct tcf_exts
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
73 /* Map to export classifier specific extension TLV types to the
74 * generic extensions API. Unsupported extensions must be set to 0.
76 struct tcf_ext_map
78 int action;
79 int police;
82 /**
83 * tcf_exts_is_predicative - check if a predicative extension is present
84 * @exts: tc filter extensions handle
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.
89 static inline int
90 tcf_exts_is_predicative(struct tcf_exts *exts)
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
102 * tcf_exts_is_available - check if at least one extension is present
103 * @exts: tc filter extensions handle
105 * Returns 1 if at least one extension is present.
107 static inline int
108 tcf_exts_is_available(struct tcf_exts *exts)
110 /* All non-predicative extensions must be added here. */
111 return tcf_exts_is_predicative(exts);
115 * tcf_exts_exec - execute tc filter extensions
116 * @skb: socket buffer
117 * @exts: tc filter extensions handle
118 * @res: desired result
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.
125 static inline int
126 tcf_exts_exec(struct sk_buff *skb, struct tcf_exts *exts,
127 struct tcf_result *res)
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
137 return 0;
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);
152 * struct tcf_pkt_info - packet information
154 struct tcf_pkt_info
156 unsigned char * ptr;
157 int nexthdr;
160 #ifdef CONFIG_NET_EMATCH
162 struct tcf_ematch_ops;
165 * struct tcf_ematch - extended match (ematch)
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
173 struct tcf_ematch
175 struct tcf_ematch_ops * ops;
176 unsigned long data;
177 unsigned int datalen;
178 u16 matchid;
179 u16 flags;
182 static inline int tcf_em_is_container(struct tcf_ematch *em)
184 return !em->ops;
187 static inline int tcf_em_is_simple(struct tcf_ematch *em)
189 return em->flags & TCF_EM_SIMPLE;
192 static inline int tcf_em_is_inverted(struct tcf_ematch *em)
194 return em->flags & TCF_EM_INVERT;
197 static inline int tcf_em_last_match(struct tcf_ematch *em)
199 return (em->flags & TCF_EM_REL_MASK) == TCF_EM_REL_END;
202 static inline int tcf_em_early_end(struct tcf_ematch *em, int result)
204 if (tcf_em_last_match(em))
205 return 1;
207 if (result == 0 && em->flags & TCF_EM_REL_AND)
208 return 1;
210 if (result != 0 && em->flags & TCF_EM_REL_OR)
211 return 1;
213 return 0;
217 * struct tcf_ematch_tree - ematch tree handle
219 * @hdr: ematch tree header supplied by userspace
220 * @matches: array of ematches
222 struct tcf_ematch_tree
224 struct tcf_ematch_tree_hdr hdr;
225 struct tcf_ematch * matches;
230 * struct tcf_ematch_ops - ematch module operations
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)
241 struct tcf_ematch_ops
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;
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 *);
266 * tcf_em_tree_change - replace ematch tree of a running classifier
268 * @tp: classifier kind handle
269 * @dst: destination ematch tree variable
270 * @src: source ematch tree (temporary tree from tcf_em_tree_validate)
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.
276 static inline void tcf_em_tree_change(struct tcf_proto *tp,
277 struct tcf_ematch_tree *dst,
278 struct tcf_ematch_tree *src)
280 tcf_tree_lock(tp);
281 memcpy(dst, src, sizeof(*dst));
282 tcf_tree_unlock(tp);
286 * tcf_em_tree_match - evaulate an ematch tree
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
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.
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.
299 static inline int tcf_em_tree_match(struct sk_buff *skb,
300 struct tcf_ematch_tree *tree,
301 struct tcf_pkt_info *info)
303 if (tree->hdr.nmatches)
304 return __tcf_em_tree_match(skb, tree, info);
305 else
306 return 1;
309 #else /* CONFIG_NET_EMATCH */
311 struct tcf_ematch_tree
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)
321 #endif /* CONFIG_NET_EMATCH */
323 static inline unsigned char * tcf_get_base_ptr(struct sk_buff *skb, int layer)
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;
334 return NULL;
337 static inline int tcf_valid_offset(struct sk_buff *skb, unsigned char *ptr,
338 int len)
340 return unlikely((ptr + len) < skb->tail && ptr > skb->head);
343 #ifdef CONFIG_NET_CLS_IND
344 static inline int
345 tcf_change_indev(struct tcf_proto *tp, char *indev, struct rtattr *indev_tlv)
347 if (rtattr_strlcpy(indev, indev_tlv, IFNAMSIZ) >= IFNAMSIZ)
348 return -EINVAL;
349 return 0;
352 static inline int
353 tcf_match_indev(struct sk_buff *skb, char *indev)
355 if (0 != indev[0]) {
356 if (NULL == skb->input_dev)
357 return 0;
358 else if (0 != strcmp(indev, skb->input_dev->name))
359 return 0;
362 return 1;
364 #endif /* CONFIG_NET_CLS_IND */
366 #endif