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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
Eric Dumazetfd2c3ef2009-11-03 03:26:03 +000010struct tcf_walker {
Linus Torvalds1da177e2005-04-16 15:20:36 -070011 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
Eric Dumazetfd2c3ef2009-11-03 03:26:03 +000063struct tcf_exts {
Linus Torvalds1da177e2005-04-16 15:20:36 -070064#ifdef CONFIG_NET_CLS_ACT
65 struct tc_action *action;
Linus Torvalds1da177e2005-04-16 15:20:36 -070066#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 */
Eric Dumazetfd2c3ef2009-11-03 03:26:03 +000072struct tcf_ext_map {
Linus Torvalds1da177e2005-04-16 15:20:36 -070073 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;
Linus Torvalds1da177e2005-04-16 15:20:36 -070089#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);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126 return 0;
127}
128
Benjamin LaHaisec1b52732013-01-14 05:15:39 +0000129extern int tcf_exts_validate(struct net *net, struct tcf_proto *tp,
130 struct nlattr **tb, struct nlattr *rate_tlv,
131 struct tcf_exts *exts,
132 const struct tcf_ext_map *map);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133extern void tcf_exts_destroy(struct tcf_proto *tp, struct tcf_exts *exts);
134extern void tcf_exts_change(struct tcf_proto *tp, struct tcf_exts *dst,
135 struct tcf_exts *src);
136extern int tcf_exts_dump(struct sk_buff *skb, struct tcf_exts *exts,
Patrick McHardy52390082008-01-31 18:36:18 -0800137 const struct tcf_ext_map *map);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138extern int tcf_exts_dump_stats(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 -0700140
141/**
142 * struct tcf_pkt_info - packet information
143 */
Eric Dumazetfd2c3ef2009-11-03 03:26:03 +0000144struct tcf_pkt_info {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145 unsigned char * ptr;
146 int nexthdr;
147};
148
149#ifdef CONFIG_NET_EMATCH
150
151struct tcf_ematch_ops;
152
153/**
154 * struct tcf_ematch - extended match (ematch)
155 *
156 * @matchid: identifier to allow userspace to reidentify a match
157 * @flags: flags specifying attributes and the relation to other matches
158 * @ops: the operations lookup table of the corresponding ematch module
159 * @datalen: length of the ematch specific configuration data
160 * @data: ematch specific data
161 */
Eric Dumazetfd2c3ef2009-11-03 03:26:03 +0000162struct tcf_ematch {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163 struct tcf_ematch_ops * ops;
164 unsigned long data;
165 unsigned int datalen;
166 u16 matchid;
167 u16 flags;
168};
169
170static inline int tcf_em_is_container(struct tcf_ematch *em)
171{
172 return !em->ops;
173}
174
175static inline int tcf_em_is_simple(struct tcf_ematch *em)
176{
177 return em->flags & TCF_EM_SIMPLE;
178}
179
180static inline int tcf_em_is_inverted(struct tcf_ematch *em)
181{
182 return em->flags & TCF_EM_INVERT;
183}
184
185static inline int tcf_em_last_match(struct tcf_ematch *em)
186{
187 return (em->flags & TCF_EM_REL_MASK) == TCF_EM_REL_END;
188}
189
190static inline int tcf_em_early_end(struct tcf_ematch *em, int result)
191{
192 if (tcf_em_last_match(em))
193 return 1;
194
195 if (result == 0 && em->flags & TCF_EM_REL_AND)
196 return 1;
197
198 if (result != 0 && em->flags & TCF_EM_REL_OR)
199 return 1;
200
201 return 0;
202}
203
204/**
205 * struct tcf_ematch_tree - ematch tree handle
206 *
207 * @hdr: ematch tree header supplied by userspace
208 * @matches: array of ematches
209 */
Eric Dumazetfd2c3ef2009-11-03 03:26:03 +0000210struct tcf_ematch_tree {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211 struct tcf_ematch_tree_hdr hdr;
212 struct tcf_ematch * matches;
213
214};
215
216/**
217 * struct tcf_ematch_ops - ematch module operations
218 *
219 * @kind: identifier (kind) of this ematch module
220 * @datalen: length of expected configuration data (optional)
221 * @change: called during validation (optional)
222 * @match: called during ematch tree evaluation, must return 1/0
223 * @destroy: called during destroyage (optional)
224 * @dump: called during dumping process (optional)
225 * @owner: owner, must be set to THIS_MODULE
226 * @link: link to previous/next ematch module (internal use)
227 */
Eric Dumazetfd2c3ef2009-11-03 03:26:03 +0000228struct tcf_ematch_ops {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229 int kind;
230 int datalen;
231 int (*change)(struct tcf_proto *, void *,
232 int, struct tcf_ematch *);
233 int (*match)(struct sk_buff *, struct tcf_ematch *,
234 struct tcf_pkt_info *);
235 void (*destroy)(struct tcf_proto *,
236 struct tcf_ematch *);
237 int (*dump)(struct sk_buff *, struct tcf_ematch *);
238 struct module *owner;
239 struct list_head link;
240};
241
242extern int tcf_em_register(struct tcf_ematch_ops *);
Alexey Dobriyan4d24b522008-11-16 23:01:49 -0800243extern void tcf_em_unregister(struct tcf_ematch_ops *);
Patrick McHardyadd93b62008-01-22 22:11:33 -0800244extern int tcf_em_tree_validate(struct tcf_proto *, struct nlattr *,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245 struct tcf_ematch_tree *);
246extern void tcf_em_tree_destroy(struct tcf_proto *, struct tcf_ematch_tree *);
247extern int tcf_em_tree_dump(struct sk_buff *, struct tcf_ematch_tree *, int);
248extern int __tcf_em_tree_match(struct sk_buff *, struct tcf_ematch_tree *,
249 struct tcf_pkt_info *);
250
251/**
252 * tcf_em_tree_change - replace ematch tree of a running classifier
253 *
254 * @tp: classifier kind handle
255 * @dst: destination ematch tree variable
256 * @src: source ematch tree (temporary tree from tcf_em_tree_validate)
257 *
258 * This functions replaces the ematch tree in @dst with the ematch
259 * tree in @src. The classifier in charge of the ematch tree may be
260 * running.
261 */
262static inline void tcf_em_tree_change(struct tcf_proto *tp,
263 struct tcf_ematch_tree *dst,
264 struct tcf_ematch_tree *src)
265{
266 tcf_tree_lock(tp);
267 memcpy(dst, src, sizeof(*dst));
268 tcf_tree_unlock(tp);
269}
270
271/**
272 * tcf_em_tree_match - evaulate an ematch tree
273 *
274 * @skb: socket buffer of the packet in question
275 * @tree: ematch tree to be used for evaluation
276 * @info: packet information examined by classifier
277 *
278 * This function matches @skb against the ematch tree in @tree by going
279 * through all ematches respecting their logic relations returning
280 * as soon as the result is obvious.
281 *
282 * Returns 1 if the ematch tree as-one matches, no ematches are configured
283 * or ematch is not enabled in the kernel, otherwise 0 is returned.
284 */
285static inline int tcf_em_tree_match(struct sk_buff *skb,
286 struct tcf_ematch_tree *tree,
287 struct tcf_pkt_info *info)
288{
289 if (tree->hdr.nmatches)
290 return __tcf_em_tree_match(skb, tree, info);
291 else
292 return 1;
293}
294
Patrick McHardydb3d99c2007-07-11 19:46:26 -0700295#define MODULE_ALIAS_TCF_EMATCH(kind) MODULE_ALIAS("ematch-kind-" __stringify(kind))
296
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297#else /* CONFIG_NET_EMATCH */
298
Eric Dumazetfd2c3ef2009-11-03 03:26:03 +0000299struct tcf_ematch_tree {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300};
301
302#define tcf_em_tree_validate(tp, tb, t) ((void)(t), 0)
303#define tcf_em_tree_destroy(tp, t) do { (void)(t); } while(0)
304#define tcf_em_tree_dump(skb, t, tlv) (0)
305#define tcf_em_tree_change(tp, dst, src) do { } while(0)
306#define tcf_em_tree_match(skb, t, info) ((void)(info), 1)
307
308#endif /* CONFIG_NET_EMATCH */
309
310static inline unsigned char * tcf_get_base_ptr(struct sk_buff *skb, int layer)
311{
312 switch (layer) {
313 case TCF_LAYER_LINK:
314 return skb->data;
315 case TCF_LAYER_NETWORK:
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700316 return skb_network_header(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317 case TCF_LAYER_TRANSPORT:
Arnaldo Carvalho de Melo9c702202007-04-25 18:04:18 -0700318 return skb_transport_header(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319 }
320
321 return NULL;
322}
323
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700324static inline int tcf_valid_offset(const struct sk_buff *skb,
325 const unsigned char *ptr, const int len)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326{
David S. Millerda521b22010-12-21 12:43:16 -0800327 return likely((ptr + len) <= skb_tail_pointer(skb) &&
328 ptr >= skb->head &&
329 (ptr <= (ptr + len)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330}
331
332#ifdef CONFIG_NET_CLS_IND
Denis V. Lunev0eeb8ff2007-12-04 01:15:45 -0800333#include <net/net_namespace.h>
334
Linus Torvalds1da177e2005-04-16 15:20:36 -0700335static inline int
Patrick McHardyadd93b62008-01-22 22:11:33 -0800336tcf_change_indev(struct tcf_proto *tp, char *indev, struct nlattr *indev_tlv)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337{
Patrick McHardyadd93b62008-01-22 22:11:33 -0800338 if (nla_strlcpy(indev, indev_tlv, IFNAMSIZ) >= IFNAMSIZ)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339 return -EINVAL;
340 return 0;
341}
342
343static inline int
344tcf_match_indev(struct sk_buff *skb, char *indev)
345{
Patrick McHardyc01003c2007-03-29 11:46:52 -0700346 struct net_device *dev;
347
David S. Miller86e65da2005-08-09 19:36:29 -0700348 if (indev[0]) {
Eric Dumazet8964be42009-11-20 15:35:04 -0800349 if (!skb->skb_iif)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350 return 0;
Eric Dumazet8964be42009-11-20 15:35:04 -0800351 dev = __dev_get_by_index(dev_net(skb->dev), skb->skb_iif);
Patrick McHardyc01003c2007-03-29 11:46:52 -0700352 if (!dev || strcmp(indev, dev->name))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353 return 0;
354 }
355
356 return 1;
357}
358#endif /* CONFIG_NET_CLS_IND */
359
360#endif