1 #ifndef __NET_PKT_CLS_H
2 #define __NET_PKT_CLS_H
4 #include <linux/pkt_cls.h>
5 #include <net/net_namespace.h>
6 #include <net/sch_generic.h>
7 #include <net/act_api.h>
9 /* Basic packet classifier frontend definitions. */
16 int (*fn)(struct tcf_proto *, unsigned long node, struct tcf_walker *);
19 extern int register_tcf_proto_ops(struct tcf_proto_ops *ops);
20 extern int unregister_tcf_proto_ops(struct tcf_proto_ops *ops);
22 static inline unsigned long
23 __cls_set_class(unsigned long *clp, unsigned long cl)
32 static inline unsigned long
33 cls_set_class(struct tcf_proto *tp, unsigned long *clp,
39 old_cl = __cls_set_class(clp, cl);
46 tcf_bind_filter(struct tcf_proto *tp, struct tcf_result *r, unsigned long base)
50 cl = tp->q->ops->cl_ops->bind_tcf(tp->q, base, r->classid);
51 cl = cls_set_class(tp, &r->class, cl);
53 tp->q->ops->cl_ops->unbind_tcf(tp->q, cl);
57 tcf_unbind_filter(struct tcf_proto *tp, struct tcf_result *r)
61 if ((cl = __cls_set_class(&r->class, 0)) != 0)
62 tp->q->ops->cl_ops->unbind_tcf(tp->q, cl);
67 #ifdef CONFIG_NET_CLS_ACT
68 struct tc_action *action;
72 /* Map to export classifier specific extension TLV types to the
73 * generic extensions API. Unsupported extensions must be set to 0.
82 * tcf_exts_is_predicative - check if a predicative extension is present
83 * @exts: tc filter extensions handle
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.
89 tcf_exts_is_predicative(struct tcf_exts *exts)
91 #ifdef CONFIG_NET_CLS_ACT
92 return !!exts->action;
99 * tcf_exts_is_available - check if at least one extension is present
100 * @exts: tc filter extensions handle
102 * Returns 1 if at least one extension is present.
105 tcf_exts_is_available(struct tcf_exts *exts)
107 /* All non-predicative extensions must be added here. */
108 return tcf_exts_is_predicative(exts);
112 * tcf_exts_exec - execute tc filter extensions
113 * @skb: socket buffer
114 * @exts: tc filter extensions handle
115 * @res: desired result
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
123 tcf_exts_exec(struct sk_buff *skb, struct tcf_exts *exts,
124 struct tcf_result *res)
126 #ifdef CONFIG_NET_CLS_ACT
128 return tcf_action_exec(skb, exts->action, res);
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);
145 * struct tcf_pkt_info - packet information
153 #ifdef CONFIG_NET_EMATCH
155 struct tcf_ematch_ops;
158 * struct tcf_ematch - extended match (ematch)
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
168 struct tcf_ematch_ops * ops;
170 unsigned int datalen;
175 static inline int tcf_em_is_container(struct tcf_ematch *em)
180 static inline int tcf_em_is_simple(struct tcf_ematch *em)
182 return em->flags & TCF_EM_SIMPLE;
185 static inline int tcf_em_is_inverted(struct tcf_ematch *em)
187 return em->flags & TCF_EM_INVERT;
190 static inline int tcf_em_last_match(struct tcf_ematch *em)
192 return (em->flags & TCF_EM_REL_MASK) == TCF_EM_REL_END;
195 static inline int tcf_em_early_end(struct tcf_ematch *em, int result)
197 if (tcf_em_last_match(em))
200 if (result == 0 && em->flags & TCF_EM_REL_AND)
203 if (result != 0 && em->flags & TCF_EM_REL_OR)
210 * struct tcf_ematch_tree - ematch tree handle
212 * @hdr: ematch tree header supplied by userspace
213 * @matches: array of ematches
215 struct tcf_ematch_tree
217 struct tcf_ematch_tree_hdr hdr;
218 struct tcf_ematch * matches;
223 * struct tcf_ematch_ops - ematch module operations
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)
234 struct tcf_ematch_ops
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;
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 *);
259 * tcf_em_tree_change - replace ematch tree of a running classifier
261 * @tp: classifier kind handle
262 * @dst: destination ematch tree variable
263 * @src: source ematch tree (temporary tree from tcf_em_tree_validate)
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
269 static inline void tcf_em_tree_change(struct tcf_proto *tp,
270 struct tcf_ematch_tree *dst,
271 struct tcf_ematch_tree *src)
274 memcpy(dst, src, sizeof(*dst));
279 * tcf_em_tree_match - evaulate an ematch tree
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
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.
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.
292 static inline int tcf_em_tree_match(struct sk_buff *skb,
293 struct tcf_ematch_tree *tree,
294 struct tcf_pkt_info *info)
296 if (tree->hdr.nmatches)
297 return __tcf_em_tree_match(skb, tree, info);
302 #define MODULE_ALIAS_TCF_EMATCH(kind) MODULE_ALIAS("ematch-kind-" __stringify(kind))
304 #else /* CONFIG_NET_EMATCH */
306 struct tcf_ematch_tree
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)
316 #endif /* CONFIG_NET_EMATCH */
318 static inline unsigned char * tcf_get_base_ptr(struct sk_buff *skb, int layer)
323 case TCF_LAYER_NETWORK:
324 return skb_network_header(skb);
325 case TCF_LAYER_TRANSPORT:
326 return skb_transport_header(skb);
332 static inline int tcf_valid_offset(const struct sk_buff *skb,
333 const unsigned char *ptr, const int len)
335 return unlikely((ptr + len) < skb_tail_pointer(skb) && ptr > skb->head);
338 #ifdef CONFIG_NET_CLS_IND
340 tcf_change_indev(struct tcf_proto *tp, char *indev, struct rtattr *indev_tlv)
342 if (rtattr_strlcpy(indev, indev_tlv, IFNAMSIZ) >= IFNAMSIZ)
348 tcf_match_indev(struct sk_buff *skb, char *indev)
350 struct net_device *dev;
355 dev = __dev_get_by_index(&init_net, skb->iif);
356 if (!dev || strcmp(indev, dev->name))
362 #endif /* CONFIG_NET_CLS_IND */