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1da177e4 LT |
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 | ||
fd2c3ef7 | 10 | struct tcf_walker { |
1da177e4 LT |
11 | int stop; |
12 | int skip; | |
13 | int count; | |
14 | int (*fn)(struct tcf_proto *, unsigned long node, struct tcf_walker *); | |
15 | }; | |
16 | ||
17 | extern int register_tcf_proto_ops(struct tcf_proto_ops *ops); | |
18 | extern int unregister_tcf_proto_ops(struct tcf_proto_ops *ops); | |
19 | ||
20 | static 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 | ||
30 | static inline unsigned long | |
31 | cls_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 | ||
43 | static inline void | |
44 | tcf_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 | ||
54 | static inline void | |
55 | tcf_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 | ||
fd2c3ef7 | 63 | struct tcf_exts { |
1da177e4 LT |
64 | #ifdef CONFIG_NET_CLS_ACT |
65 | struct tc_action *action; | |
1da177e4 LT |
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 | */ | |
fd2c3ef7 | 72 | struct tcf_ext_map { |
1da177e4 LT |
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 | */ | |
84 | static inline int | |
85 | tcf_exts_is_predicative(struct tcf_exts *exts) | |
86 | { | |
87 | #ifdef CONFIG_NET_CLS_ACT | |
88 | return !!exts->action; | |
1da177e4 LT |
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 | */ | |
100 | static inline int | |
101 | tcf_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 | */ | |
118 | static inline int | |
119 | tcf_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); | |
1da177e4 | 125 | #endif |
1da177e4 LT |
126 | return 0; |
127 | } | |
128 | ||
c1b52739 BL |
129 | extern 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); | |
1da177e4 LT |
133 | extern void tcf_exts_destroy(struct tcf_proto *tp, struct tcf_exts *exts); |
134 | extern void tcf_exts_change(struct tcf_proto *tp, struct tcf_exts *dst, | |
135 | struct tcf_exts *src); | |
136 | extern int tcf_exts_dump(struct sk_buff *skb, struct tcf_exts *exts, | |
5239008b | 137 | const struct tcf_ext_map *map); |
1da177e4 | 138 | extern int tcf_exts_dump_stats(struct sk_buff *skb, struct tcf_exts *exts, |
5239008b | 139 | const struct tcf_ext_map *map); |
1da177e4 LT |
140 | |
141 | /** | |
142 | * struct tcf_pkt_info - packet information | |
143 | */ | |
fd2c3ef7 | 144 | struct tcf_pkt_info { |
1da177e4 LT |
145 | unsigned char * ptr; |
146 | int nexthdr; | |
147 | }; | |
148 | ||
149 | #ifdef CONFIG_NET_EMATCH | |
150 | ||
151 | struct 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 | */ | |
fd2c3ef7 | 162 | struct tcf_ematch { |
1da177e4 LT |
163 | struct tcf_ematch_ops * ops; |
164 | unsigned long data; | |
165 | unsigned int datalen; | |
166 | u16 matchid; | |
167 | u16 flags; | |
168 | }; | |
169 | ||
170 | static inline int tcf_em_is_container(struct tcf_ematch *em) | |
171 | { | |
172 | return !em->ops; | |
173 | } | |
174 | ||
175 | static inline int tcf_em_is_simple(struct tcf_ematch *em) | |
176 | { | |
177 | return em->flags & TCF_EM_SIMPLE; | |
178 | } | |
179 | ||
180 | static inline int tcf_em_is_inverted(struct tcf_ematch *em) | |
181 | { | |
182 | return em->flags & TCF_EM_INVERT; | |
183 | } | |
184 | ||
185 | static 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 | ||
190 | static 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 | */ | |
fd2c3ef7 | 210 | struct tcf_ematch_tree { |
1da177e4 LT |
211 | 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 | */ | |
fd2c3ef7 | 228 | struct tcf_ematch_ops { |
1da177e4 LT |
229 | 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 | ||
242 | extern int tcf_em_register(struct tcf_ematch_ops *); | |
4d24b52a | 243 | extern void tcf_em_unregister(struct tcf_ematch_ops *); |
add93b61 | 244 | extern int tcf_em_tree_validate(struct tcf_proto *, struct nlattr *, |
1da177e4 LT |
245 | struct tcf_ematch_tree *); |
246 | extern void tcf_em_tree_destroy(struct tcf_proto *, struct tcf_ematch_tree *); | |
247 | extern int tcf_em_tree_dump(struct sk_buff *, struct tcf_ematch_tree *, int); | |
248 | extern 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 | */ | |
262 | static 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 | */ | |
285 | static 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 | ||
db3d99c0 PM |
295 | #define MODULE_ALIAS_TCF_EMATCH(kind) MODULE_ALIAS("ematch-kind-" __stringify(kind)) |
296 | ||
1da177e4 LT |
297 | #else /* CONFIG_NET_EMATCH */ |
298 | ||
fd2c3ef7 | 299 | struct tcf_ematch_tree { |
1da177e4 LT |
300 | }; |
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 | ||
310 | static 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: | |
d56f90a7 | 316 | return skb_network_header(skb); |
1da177e4 | 317 | case TCF_LAYER_TRANSPORT: |
9c70220b | 318 | return skb_transport_header(skb); |
1da177e4 LT |
319 | } |
320 | ||
321 | return NULL; | |
322 | } | |
323 | ||
eddc9ec5 ACM |
324 | static inline int tcf_valid_offset(const struct sk_buff *skb, |
325 | const unsigned char *ptr, const int len) | |
1da177e4 | 326 | { |
da521b2c DM |
327 | return likely((ptr + len) <= skb_tail_pointer(skb) && |
328 | ptr >= skb->head && | |
329 | (ptr <= (ptr + len))); | |
1da177e4 LT |
330 | } |
331 | ||
332 | #ifdef CONFIG_NET_CLS_IND | |
0eeb8ffc DL |
333 | #include <net/net_namespace.h> |
334 | ||
1da177e4 | 335 | static inline int |
add93b61 | 336 | tcf_change_indev(struct tcf_proto *tp, char *indev, struct nlattr *indev_tlv) |
1da177e4 | 337 | { |
add93b61 | 338 | if (nla_strlcpy(indev, indev_tlv, IFNAMSIZ) >= IFNAMSIZ) |
1da177e4 LT |
339 | return -EINVAL; |
340 | return 0; | |
341 | } | |
342 | ||
343 | static inline int | |
344 | tcf_match_indev(struct sk_buff *skb, char *indev) | |
345 | { | |
c01003c2 PM |
346 | struct net_device *dev; |
347 | ||
86e65da9 | 348 | if (indev[0]) { |
8964be4a | 349 | if (!skb->skb_iif) |
1da177e4 | 350 | return 0; |
8964be4a | 351 | dev = __dev_get_by_index(dev_net(skb->dev), skb->skb_iif); |
c01003c2 | 352 | if (!dev || strcmp(indev, dev->name)) |
1da177e4 LT |
353 | return 0; |
354 | } | |
355 | ||
356 | return 1; | |
357 | } | |
358 | #endif /* CONFIG_NET_CLS_IND */ | |
359 | ||
360 | #endif |