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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
10struct tcf_walker {
11 int stop;
12 int skip;
13 int count;
14 int (*fn)(struct tcf_proto *, unsigned long node, struct tcf_walker *);
15};
16
17extern int register_tcf_proto_ops(struct tcf_proto_ops *ops);
18extern int unregister_tcf_proto_ops(struct tcf_proto_ops *ops);
19
20static inline unsigned long
21__cls_set_class(unsigned long *clp, unsigned long cl)
22{
23 unsigned long old_cl;
24
25 old_cl = *clp;
26 *clp = cl;
27 return old_cl;
28}
29
30static inline unsigned long
31cls_set_class(struct tcf_proto *tp, unsigned long *clp,
32 unsigned long cl)
33{
34 unsigned long old_cl;
35
36 tcf_tree_lock(tp);
37 old_cl = __cls_set_class(clp, cl);
38 tcf_tree_unlock(tp);
39
40 return old_cl;
41}
42
43static inline void
44tcf_bind_filter(struct tcf_proto *tp, struct tcf_result *r, unsigned long base)
45{
46 unsigned long cl;
47
48 cl = tp->q->ops->cl_ops->bind_tcf(tp->q, base, r->classid);
49 cl = cls_set_class(tp, &r->class, cl);
50 if (cl)
51 tp->q->ops->cl_ops->unbind_tcf(tp->q, cl);
52}
53
54static inline void
55tcf_unbind_filter(struct tcf_proto *tp, struct tcf_result *r)
56{
57 unsigned long cl;
58
59 if ((cl = __cls_set_class(&r->class, 0)) != 0)
60 tp->q->ops->cl_ops->unbind_tcf(tp->q, cl);
61}
62
63struct tcf_exts {
64#ifdef CONFIG_NET_CLS_ACT
65 struct tc_action *action;
66#endif
67};
68
69/* Map to export classifier specific extension TLV types to the
70 * generic extensions API. Unsupported extensions must be set to 0.
71 */
72struct tcf_ext_map {
73 int action;
74 int police;
75};
76
77/**
78 * tcf_exts_is_predicative - check if a predicative extension is present
79 * @exts: tc filter extensions handle
80 *
81 * Returns 1 if a predicative extension is present, i.e. an extension which
82 * might cause further actions and thus overrule the regular tcf_result.
83 */
84static inline int
85tcf_exts_is_predicative(struct tcf_exts *exts)
86{
87#ifdef CONFIG_NET_CLS_ACT
88 return !!exts->action;
89#else
90 return 0;
91#endif
92}
93
94/**
95 * tcf_exts_is_available - check if at least one extension is present
96 * @exts: tc filter extensions handle
97 *
98 * Returns 1 if at least one extension is present.
99 */
100static inline int
101tcf_exts_is_available(struct tcf_exts *exts)
102{
103 /* All non-predicative extensions must be added here. */
104 return tcf_exts_is_predicative(exts);
105}
106
107/**
108 * tcf_exts_exec - execute tc filter extensions
109 * @skb: socket buffer
110 * @exts: tc filter extensions handle
111 * @res: desired result
112 *
113 * Executes all configured extensions. Returns 0 on a normal execution,
114 * a negative number if the filter must be considered unmatched or
115 * a positive action code (TC_ACT_*) which must be returned to the
116 * underlying layer.
117 */
118static inline int
119tcf_exts_exec(struct sk_buff *skb, struct tcf_exts *exts,
120 struct tcf_result *res)
121{
122#ifdef CONFIG_NET_CLS_ACT
123 if (exts->action)
124 return tcf_action_exec(skb, exts->action, res);
125#endif
126 return 0;
127}
128
129extern int tcf_exts_validate(struct tcf_proto *tp, struct nlattr **tb,
130 struct nlattr *rate_tlv, struct tcf_exts *exts,
131 const struct tcf_ext_map *map);
132extern void tcf_exts_destroy(struct tcf_proto *tp, struct tcf_exts *exts);
133extern void tcf_exts_change(struct tcf_proto *tp, struct tcf_exts *dst,
134 struct tcf_exts *src);
135extern int tcf_exts_dump(struct sk_buff *skb, struct tcf_exts *exts,
136 const struct tcf_ext_map *map);
137extern int tcf_exts_dump_stats(struct sk_buff *skb, struct tcf_exts *exts,
138 const struct tcf_ext_map *map);
139
140/**
141 * struct tcf_pkt_info - packet information
142 */
143struct tcf_pkt_info {
144 unsigned char * ptr;
145 int nexthdr;
146};
147
148#ifdef CONFIG_NET_EMATCH
149
150struct tcf_ematch_ops;
151
152/**
153 * struct tcf_ematch - extended match (ematch)
154 *
155 * @matchid: identifier to allow userspace to reidentify a match
156 * @flags: flags specifying attributes and the relation to other matches
157 * @ops: the operations lookup table of the corresponding ematch module
158 * @datalen: length of the ematch specific configuration data
159 * @data: ematch specific data
160 */
161struct tcf_ematch {
162 struct tcf_ematch_ops * ops;
163 unsigned long data;
164 unsigned int datalen;
165 u16 matchid;
166 u16 flags;
167};
168
169static inline int tcf_em_is_container(struct tcf_ematch *em)
170{
171 return !em->ops;
172}
173
174static inline int tcf_em_is_simple(struct tcf_ematch *em)
175{
176 return em->flags & TCF_EM_SIMPLE;
177}
178
179static inline int tcf_em_is_inverted(struct tcf_ematch *em)
180{
181 return em->flags & TCF_EM_INVERT;
182}
183
184static inline int tcf_em_last_match(struct tcf_ematch *em)
185{
186 return (em->flags & TCF_EM_REL_MASK) == TCF_EM_REL_END;
187}
188
189static inline int tcf_em_early_end(struct tcf_ematch *em, int result)
190{
191 if (tcf_em_last_match(em))
192 return 1;
193
194 if (result == 0 && em->flags & TCF_EM_REL_AND)
195 return 1;
196
197 if (result != 0 && em->flags & TCF_EM_REL_OR)
198 return 1;
199
200 return 0;
201}
202
203/**
204 * struct tcf_ematch_tree - ematch tree handle
205 *
206 * @hdr: ematch tree header supplied by userspace
207 * @matches: array of ematches
208 */
209struct tcf_ematch_tree {
210 struct tcf_ematch_tree_hdr hdr;
211 struct tcf_ematch * matches;
212
213};
214
215/**
216 * struct tcf_ematch_ops - ematch module operations
217 *
218 * @kind: identifier (kind) of this ematch module
219 * @datalen: length of expected configuration data (optional)
220 * @change: called during validation (optional)
221 * @match: called during ematch tree evaluation, must return 1/0
222 * @destroy: called during destroyage (optional)
223 * @dump: called during dumping process (optional)
224 * @owner: owner, must be set to THIS_MODULE
225 * @link: link to previous/next ematch module (internal use)
226 */
227struct tcf_ematch_ops {
228 int kind;
229 int datalen;
230 int (*change)(struct tcf_proto *, void *,
231 int, struct tcf_ematch *);
232 int (*match)(struct sk_buff *, struct tcf_ematch *,
233 struct tcf_pkt_info *);
234 void (*destroy)(struct tcf_proto *,
235 struct tcf_ematch *);
236 int (*dump)(struct sk_buff *, struct tcf_ematch *);
237 struct module *owner;
238 struct list_head link;
239};
240
241extern int tcf_em_register(struct tcf_ematch_ops *);
242extern void tcf_em_unregister(struct tcf_ematch_ops *);
243extern int tcf_em_tree_validate(struct tcf_proto *, struct nlattr *,
244 struct tcf_ematch_tree *);
245extern void tcf_em_tree_destroy(struct tcf_proto *, struct tcf_ematch_tree *);
246extern int tcf_em_tree_dump(struct sk_buff *, struct tcf_ematch_tree *, int);
247extern int __tcf_em_tree_match(struct sk_buff *, struct tcf_ematch_tree *,
248 struct tcf_pkt_info *);
249
250/**
251 * tcf_em_tree_change - replace ematch tree of a running classifier
252 *
253 * @tp: classifier kind handle
254 * @dst: destination ematch tree variable
255 * @src: source ematch tree (temporary tree from tcf_em_tree_validate)
256 *
257 * This functions replaces the ematch tree in @dst with the ematch
258 * tree in @src. The classifier in charge of the ematch tree may be
259 * running.
260 */
261static inline void tcf_em_tree_change(struct tcf_proto *tp,
262 struct tcf_ematch_tree *dst,
263 struct tcf_ematch_tree *src)
264{
265 tcf_tree_lock(tp);
266 memcpy(dst, src, sizeof(*dst));
267 tcf_tree_unlock(tp);
268}
269
270/**
271 * tcf_em_tree_match - evaulate an ematch tree
272 *
273 * @skb: socket buffer of the packet in question
274 * @tree: ematch tree to be used for evaluation
275 * @info: packet information examined by classifier
276 *
277 * This function matches @skb against the ematch tree in @tree by going
278 * through all ematches respecting their logic relations returning
279 * as soon as the result is obvious.
280 *
281 * Returns 1 if the ematch tree as-one matches, no ematches are configured
282 * or ematch is not enabled in the kernel, otherwise 0 is returned.
283 */
284static inline int tcf_em_tree_match(struct sk_buff *skb,
285 struct tcf_ematch_tree *tree,
286 struct tcf_pkt_info *info)
287{
288 if (tree->hdr.nmatches)
289 return __tcf_em_tree_match(skb, tree, info);
290 else
291 return 1;
292}
293
294#define MODULE_ALIAS_TCF_EMATCH(kind) MODULE_ALIAS("ematch-kind-" __stringify(kind))
295
296#else /* CONFIG_NET_EMATCH */
297
298struct tcf_ematch_tree {
299};
300
301#define tcf_em_tree_validate(tp, tb, t) ((void)(t), 0)
302#define tcf_em_tree_destroy(tp, t) do { (void)(t); } while(0)
303#define tcf_em_tree_dump(skb, t, tlv) (0)
304#define tcf_em_tree_change(tp, dst, src) do { } while(0)
305#define tcf_em_tree_match(skb, t, info) ((void)(info), 1)
306
307#endif /* CONFIG_NET_EMATCH */
308
309static inline unsigned char * tcf_get_base_ptr(struct sk_buff *skb, int layer)
310{
311 switch (layer) {
312 case TCF_LAYER_LINK:
313 return skb->data;
314 case TCF_LAYER_NETWORK:
315 return skb_network_header(skb);
316 case TCF_LAYER_TRANSPORT:
317 return skb_transport_header(skb);
318 }
319
320 return NULL;
321}
322
323static inline int tcf_valid_offset(const struct sk_buff *skb,
324 const unsigned char *ptr, const int len)
325{
326 return likely((ptr + len) <= skb_tail_pointer(skb) &&
327 ptr >= skb->head &&
328 (ptr <= (ptr + len)));
329}
330
331#ifdef CONFIG_NET_CLS_IND
332#include <net/net_namespace.h>
333
334static inline int
335tcf_change_indev(struct tcf_proto *tp, char *indev, struct nlattr *indev_tlv)
336{
337 if (nla_strlcpy(indev, indev_tlv, IFNAMSIZ) >= IFNAMSIZ)
338 return -EINVAL;
339 return 0;
340}
341
342static inline int
343tcf_match_indev(struct sk_buff *skb, char *indev)
344{
345 struct net_device *dev;
346
347 if (indev[0]) {
348 if (!skb->skb_iif)
349 return 0;
350 dev = __dev_get_by_index(dev_net(skb->dev), skb->skb_iif);
351 if (!dev || strcmp(indev, dev->name))
352 return 0;
353 }
354
355 return 1;
356}
357#endif /* CONFIG_NET_CLS_IND */
358
359#endif