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Linus Torvalds1da177e2005-04-16 15:20:36 -07001#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
10struct 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
18extern int register_tcf_proto_ops(struct tcf_proto_ops *ops);
19extern int unregister_tcf_proto_ops(struct tcf_proto_ops *ops);
20
21static 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
31static inline unsigned long
32cls_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
44static inline void
45tcf_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
55static inline void
56tcf_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
64struct tcf_exts
65{
66#ifdef CONFIG_NET_CLS_ACT
67 struct tc_action *action;
Linus Torvalds1da177e2005-04-16 15:20:36 -070068#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 */
74struct 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 */
87static inline int
88tcf_exts_is_predicative(struct tcf_exts *exts)
89{
90#ifdef CONFIG_NET_CLS_ACT
91 return !!exts->action;
Linus Torvalds1da177e2005-04-16 15:20:36 -070092#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 */
103static inline int
104tcf_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 */
121static inline int
122tcf_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);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129 return 0;
130}
131
Patrick McHardyadd93b62008-01-22 22:11:33 -0800132extern int tcf_exts_validate(struct tcf_proto *tp, struct nlattr **tb,
133 struct nlattr *rate_tlv, struct tcf_exts *exts,
Patrick McHardy52390082008-01-31 18:36:18 -0800134 const struct tcf_ext_map *map);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135extern void tcf_exts_destroy(struct tcf_proto *tp, struct tcf_exts *exts);
136extern void tcf_exts_change(struct tcf_proto *tp, struct tcf_exts *dst,
137 struct tcf_exts *src);
138extern int tcf_exts_dump(struct sk_buff *skb, struct tcf_exts *exts,
Patrick McHardy52390082008-01-31 18:36:18 -0800139 const struct tcf_ext_map *map);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140extern int tcf_exts_dump_stats(struct sk_buff *skb, struct tcf_exts *exts,
Patrick McHardy52390082008-01-31 18:36:18 -0800141 const struct tcf_ext_map *map);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142
143/**
144 * struct tcf_pkt_info - packet information
145 */
146struct tcf_pkt_info
147{
148 unsigned char * ptr;
149 int nexthdr;
150};
151
152#ifdef CONFIG_NET_EMATCH
153
154struct 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 */
165struct 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
174static inline int tcf_em_is_container(struct tcf_ematch *em)
175{
176 return !em->ops;
177}
178
179static inline int tcf_em_is_simple(struct tcf_ematch *em)
180{
181 return em->flags & TCF_EM_SIMPLE;
182}
183
184static inline int tcf_em_is_inverted(struct tcf_ematch *em)
185{
186 return em->flags & TCF_EM_INVERT;
187}
188
189static 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
194static 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 */
214struct 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 */
233struct 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
248extern int tcf_em_register(struct tcf_ematch_ops *);
Alexey Dobriyan4d24b522008-11-16 23:01:49 -0800249extern void tcf_em_unregister(struct tcf_ematch_ops *);
Patrick McHardyadd93b62008-01-22 22:11:33 -0800250extern int tcf_em_tree_validate(struct tcf_proto *, struct nlattr *,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251 struct tcf_ematch_tree *);
252extern void tcf_em_tree_destroy(struct tcf_proto *, struct tcf_ematch_tree *);
253extern int tcf_em_tree_dump(struct sk_buff *, struct tcf_ematch_tree *, int);
254extern 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 */
268static 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 */
291static 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
Patrick McHardydb3d99c2007-07-11 19:46:26 -0700301#define MODULE_ALIAS_TCF_EMATCH(kind) MODULE_ALIAS("ematch-kind-" __stringify(kind))
302
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303#else /* CONFIG_NET_EMATCH */
304
305struct 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
317static 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:
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700323 return skb_network_header(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324 case TCF_LAYER_TRANSPORT:
Arnaldo Carvalho de Melo9c702202007-04-25 18:04:18 -0700325 return skb_transport_header(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326 }
327
328 return NULL;
329}
330
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700331static inline int tcf_valid_offset(const struct sk_buff *skb,
332 const unsigned char *ptr, const int len)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333{
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -0700334 return unlikely((ptr + len) < skb_tail_pointer(skb) && ptr > skb->head);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700335}
336
337#ifdef CONFIG_NET_CLS_IND
Denis V. Lunev0eeb8ff2007-12-04 01:15:45 -0800338#include <net/net_namespace.h>
339
Linus Torvalds1da177e2005-04-16 15:20:36 -0700340static inline int
Patrick McHardyadd93b62008-01-22 22:11:33 -0800341tcf_change_indev(struct tcf_proto *tp, char *indev, struct nlattr *indev_tlv)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342{
Patrick McHardyadd93b62008-01-22 22:11:33 -0800343 if (nla_strlcpy(indev, indev_tlv, IFNAMSIZ) >= IFNAMSIZ)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344 return -EINVAL;
345 return 0;
346}
347
348static inline int
349tcf_match_indev(struct sk_buff *skb, char *indev)
350{
Patrick McHardyc01003c2007-03-29 11:46:52 -0700351 struct net_device *dev;
352
David S. Miller86e65da2005-08-09 19:36:29 -0700353 if (indev[0]) {
Patrick McHardyc01003c2007-03-29 11:46:52 -0700354 if (!skb->iif)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700355 return 0;
Denis V. Lunev09382ba2008-03-27 16:53:37 -0700356 dev = __dev_get_by_index(dev_net(skb->dev), skb->iif);
Patrick McHardyc01003c2007-03-29 11:46:52 -0700357 if (!dev || strcmp(indev, dev->name))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358 return 0;
359 }
360
361 return 1;
362}
363#endif /* CONFIG_NET_CLS_IND */
364
365#endif