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. */
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
)
31 static inline unsigned long
32 cls_set_class(struct tcf_proto
*tp
, unsigned long *clp
,
38 old_cl
= __cls_set_class(clp
, cl
);
45 tcf_bind_filter(struct tcf_proto
*tp
, struct tcf_result
*r
, unsigned long base
)
49 cl
= tp
->q
->ops
->cl_ops
->bind_tcf(tp
->q
, base
, r
->classid
);
50 cl
= cls_set_class(tp
, &r
->class, cl
);
52 tp
->q
->ops
->cl_ops
->unbind_tcf(tp
->q
, cl
);
56 tcf_unbind_filter(struct tcf_proto
*tp
, struct tcf_result
*r
)
60 if ((cl
= __cls_set_class(&r
->class, 0)) != 0)
61 tp
->q
->ops
->cl_ops
->unbind_tcf(tp
->q
, cl
);
66 #ifdef CONFIG_NET_CLS_ACT
67 struct tc_action
*action
;
71 /* Map to export classifier specific extension TLV types to the
72 * generic extensions API. Unsupported extensions must be set to 0.
81 * tcf_exts_is_predicative - check if a predicative extension is present
82 * @exts: tc filter extensions handle
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.
88 tcf_exts_is_predicative(struct tcf_exts
*exts
)
90 #ifdef CONFIG_NET_CLS_ACT
91 return !!exts
->action
;
98 * tcf_exts_is_available - check if at least one extension is present
99 * @exts: tc filter extensions handle
101 * Returns 1 if at least one extension is present.
104 tcf_exts_is_available(struct tcf_exts
*exts
)
106 /* All non-predicative extensions must be added here. */
107 return tcf_exts_is_predicative(exts
);
111 * tcf_exts_exec - execute tc filter extensions
112 * @skb: socket buffer
113 * @exts: tc filter extensions handle
114 * @res: desired result
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
122 tcf_exts_exec(struct sk_buff
*skb
, struct tcf_exts
*exts
,
123 struct tcf_result
*res
)
125 #ifdef CONFIG_NET_CLS_ACT
127 return tcf_action_exec(skb
, exts
->action
, res
);
132 extern int tcf_exts_validate(struct tcf_proto
*tp
, struct nlattr
**tb
,
133 struct nlattr
*rate_tlv
, struct tcf_exts
*exts
,
134 const struct tcf_ext_map
*map
);
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
,
139 const struct tcf_ext_map
*map
);
140 extern int tcf_exts_dump_stats(struct sk_buff
*skb
, struct tcf_exts
*exts
,
141 const struct tcf_ext_map
*map
);
144 * struct tcf_pkt_info - packet information
152 #ifdef CONFIG_NET_EMATCH
154 struct tcf_ematch_ops
;
157 * struct tcf_ematch - extended match (ematch)
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
167 struct tcf_ematch_ops
* ops
;
169 unsigned int datalen
;
174 static inline int tcf_em_is_container(struct tcf_ematch
*em
)
179 static inline int tcf_em_is_simple(struct tcf_ematch
*em
)
181 return em
->flags
& TCF_EM_SIMPLE
;
184 static inline int tcf_em_is_inverted(struct tcf_ematch
*em
)
186 return em
->flags
& TCF_EM_INVERT
;
189 static inline int tcf_em_last_match(struct tcf_ematch
*em
)
191 return (em
->flags
& TCF_EM_REL_MASK
) == TCF_EM_REL_END
;
194 static inline int tcf_em_early_end(struct tcf_ematch
*em
, int result
)
196 if (tcf_em_last_match(em
))
199 if (result
== 0 && em
->flags
& TCF_EM_REL_AND
)
202 if (result
!= 0 && em
->flags
& TCF_EM_REL_OR
)
209 * struct tcf_ematch_tree - ematch tree handle
211 * @hdr: ematch tree header supplied by userspace
212 * @matches: array of ematches
214 struct tcf_ematch_tree
216 struct tcf_ematch_tree_hdr hdr
;
217 struct tcf_ematch
* matches
;
222 * struct tcf_ematch_ops - ematch module operations
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)
233 struct tcf_ematch_ops
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
;
248 extern int tcf_em_register(struct tcf_ematch_ops
*);
249 extern void tcf_em_unregister(struct tcf_ematch_ops
*);
250 extern int tcf_em_tree_validate(struct tcf_proto
*, struct nlattr
*,
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
*);
258 * tcf_em_tree_change - replace ematch tree of a running classifier
260 * @tp: classifier kind handle
261 * @dst: destination ematch tree variable
262 * @src: source ematch tree (temporary tree from tcf_em_tree_validate)
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
268 static inline void tcf_em_tree_change(struct tcf_proto
*tp
,
269 struct tcf_ematch_tree
*dst
,
270 struct tcf_ematch_tree
*src
)
273 memcpy(dst
, src
, sizeof(*dst
));
278 * tcf_em_tree_match - evaulate an ematch tree
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
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.
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.
291 static inline int tcf_em_tree_match(struct sk_buff
*skb
,
292 struct tcf_ematch_tree
*tree
,
293 struct tcf_pkt_info
*info
)
295 if (tree
->hdr
.nmatches
)
296 return __tcf_em_tree_match(skb
, tree
, info
);
301 #define MODULE_ALIAS_TCF_EMATCH(kind) MODULE_ALIAS("ematch-kind-" __stringify(kind))
303 #else /* CONFIG_NET_EMATCH */
305 struct tcf_ematch_tree
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)
315 #endif /* CONFIG_NET_EMATCH */
317 static inline unsigned char * tcf_get_base_ptr(struct sk_buff
*skb
, int layer
)
322 case TCF_LAYER_NETWORK
:
323 return skb_network_header(skb
);
324 case TCF_LAYER_TRANSPORT
:
325 return skb_transport_header(skb
);
331 static inline int tcf_valid_offset(const struct sk_buff
*skb
,
332 const unsigned char *ptr
, const int len
)
334 return unlikely((ptr
+ len
) < skb_tail_pointer(skb
) && ptr
> skb
->head
);
337 #ifdef CONFIG_NET_CLS_IND
338 #include <net/net_namespace.h>
341 tcf_change_indev(struct tcf_proto
*tp
, char *indev
, struct nlattr
*indev_tlv
)
343 if (nla_strlcpy(indev
, indev_tlv
, IFNAMSIZ
) >= IFNAMSIZ
)
349 tcf_match_indev(struct sk_buff
*skb
, char *indev
)
351 struct net_device
*dev
;
356 dev
= __dev_get_by_index(dev_net(skb
->dev
), skb
->iif
);
357 if (!dev
|| strcmp(indev
, dev
->name
))
363 #endif /* CONFIG_NET_CLS_IND */