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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 | ||
5c15257f JP |
17 | int register_tcf_proto_ops(struct tcf_proto_ops *ops); |
18 | int unregister_tcf_proto_ops(struct tcf_proto_ops *ops); | |
1da177e4 LT |
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 | 64 | #ifdef CONFIG_NET_CLS_ACT |
33be6271 WC |
65 | __u32 type; /* for backward compat(TCA_OLD_COMPAT) */ |
66 | struct list_head actions; | |
1da177e4 | 67 | #endif |
5da57f42 WC |
68 | /* Map to export classifier specific extension TLV types to the |
69 | * generic extensions API. Unsupported extensions must be set to 0. | |
70 | */ | |
1da177e4 LT |
71 | int action; |
72 | int police; | |
73 | }; | |
74 | ||
5da57f42 | 75 | static inline void tcf_exts_init(struct tcf_exts *exts, int action, int police) |
33be6271 WC |
76 | { |
77 | #ifdef CONFIG_NET_CLS_ACT | |
5da57f42 | 78 | exts->type = 0; |
33be6271 WC |
79 | INIT_LIST_HEAD(&exts->actions); |
80 | #endif | |
5da57f42 WC |
81 | exts->action = action; |
82 | exts->police = police; | |
33be6271 WC |
83 | } |
84 | ||
1da177e4 LT |
85 | /** |
86 | * tcf_exts_is_predicative - check if a predicative extension is present | |
87 | * @exts: tc filter extensions handle | |
88 | * | |
89 | * Returns 1 if a predicative extension is present, i.e. an extension which | |
90 | * might cause further actions and thus overrule the regular tcf_result. | |
91 | */ | |
92 | static inline int | |
93 | tcf_exts_is_predicative(struct tcf_exts *exts) | |
94 | { | |
95 | #ifdef CONFIG_NET_CLS_ACT | |
33be6271 | 96 | return !list_empty(&exts->actions); |
1da177e4 LT |
97 | #else |
98 | return 0; | |
99 | #endif | |
100 | } | |
101 | ||
102 | /** | |
103 | * tcf_exts_is_available - check if at least one extension is present | |
104 | * @exts: tc filter extensions handle | |
105 | * | |
106 | * Returns 1 if at least one extension is present. | |
107 | */ | |
108 | static inline int | |
109 | tcf_exts_is_available(struct tcf_exts *exts) | |
110 | { | |
111 | /* All non-predicative extensions must be added here. */ | |
112 | return tcf_exts_is_predicative(exts); | |
113 | } | |
114 | ||
115 | /** | |
116 | * tcf_exts_exec - execute tc filter extensions | |
117 | * @skb: socket buffer | |
118 | * @exts: tc filter extensions handle | |
119 | * @res: desired result | |
120 | * | |
121 | * Executes all configured extensions. Returns 0 on a normal execution, | |
122 | * a negative number if the filter must be considered unmatched or | |
123 | * a positive action code (TC_ACT_*) which must be returned to the | |
124 | * underlying layer. | |
125 | */ | |
126 | static inline int | |
127 | tcf_exts_exec(struct sk_buff *skb, struct tcf_exts *exts, | |
128 | struct tcf_result *res) | |
129 | { | |
130 | #ifdef CONFIG_NET_CLS_ACT | |
33be6271 WC |
131 | if (!list_empty(&exts->actions)) |
132 | return tcf_action_exec(skb, &exts->actions, res); | |
1da177e4 | 133 | #endif |
1da177e4 LT |
134 | return 0; |
135 | } | |
136 | ||
5c15257f JP |
137 | int tcf_exts_validate(struct net *net, struct tcf_proto *tp, |
138 | struct nlattr **tb, struct nlattr *rate_tlv, | |
5da57f42 | 139 | struct tcf_exts *exts); |
5c15257f JP |
140 | void tcf_exts_destroy(struct tcf_proto *tp, struct tcf_exts *exts); |
141 | void tcf_exts_change(struct tcf_proto *tp, struct tcf_exts *dst, | |
142 | struct tcf_exts *src); | |
5da57f42 WC |
143 | int tcf_exts_dump(struct sk_buff *skb, struct tcf_exts *exts); |
144 | int tcf_exts_dump_stats(struct sk_buff *skb, struct tcf_exts *exts); | |
1da177e4 LT |
145 | |
146 | /** | |
147 | * struct tcf_pkt_info - packet information | |
148 | */ | |
fd2c3ef7 | 149 | struct tcf_pkt_info { |
1da177e4 LT |
150 | unsigned char * ptr; |
151 | int nexthdr; | |
152 | }; | |
153 | ||
154 | #ifdef CONFIG_NET_EMATCH | |
155 | ||
156 | struct tcf_ematch_ops; | |
157 | ||
158 | /** | |
159 | * struct tcf_ematch - extended match (ematch) | |
160 | * | |
161 | * @matchid: identifier to allow userspace to reidentify a match | |
162 | * @flags: flags specifying attributes and the relation to other matches | |
163 | * @ops: the operations lookup table of the corresponding ematch module | |
164 | * @datalen: length of the ematch specific configuration data | |
165 | * @data: ematch specific data | |
166 | */ | |
fd2c3ef7 | 167 | struct tcf_ematch { |
1da177e4 LT |
168 | struct tcf_ematch_ops * ops; |
169 | unsigned long data; | |
170 | unsigned int datalen; | |
171 | u16 matchid; | |
172 | u16 flags; | |
173 | }; | |
174 | ||
175 | static inline int tcf_em_is_container(struct tcf_ematch *em) | |
176 | { | |
177 | return !em->ops; | |
178 | } | |
179 | ||
180 | static inline int tcf_em_is_simple(struct tcf_ematch *em) | |
181 | { | |
182 | return em->flags & TCF_EM_SIMPLE; | |
183 | } | |
184 | ||
185 | static inline int tcf_em_is_inverted(struct tcf_ematch *em) | |
186 | { | |
187 | return em->flags & TCF_EM_INVERT; | |
188 | } | |
189 | ||
190 | static inline int tcf_em_last_match(struct tcf_ematch *em) | |
191 | { | |
192 | return (em->flags & TCF_EM_REL_MASK) == TCF_EM_REL_END; | |
193 | } | |
194 | ||
195 | static inline int tcf_em_early_end(struct tcf_ematch *em, int result) | |
196 | { | |
197 | if (tcf_em_last_match(em)) | |
198 | return 1; | |
199 | ||
200 | if (result == 0 && em->flags & TCF_EM_REL_AND) | |
201 | return 1; | |
202 | ||
203 | if (result != 0 && em->flags & TCF_EM_REL_OR) | |
204 | return 1; | |
205 | ||
206 | return 0; | |
207 | } | |
208 | ||
209 | /** | |
210 | * struct tcf_ematch_tree - ematch tree handle | |
211 | * | |
212 | * @hdr: ematch tree header supplied by userspace | |
213 | * @matches: array of ematches | |
214 | */ | |
fd2c3ef7 | 215 | struct tcf_ematch_tree { |
1da177e4 LT |
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 | */ | |
fd2c3ef7 | 233 | struct tcf_ematch_ops { |
1da177e4 LT |
234 | int kind; |
235 | int datalen; | |
236 | int (*change)(struct tcf_proto *, void *, | |
237 | int, struct tcf_ematch *); | |
238 | int (*match)(struct sk_buff *, struct tcf_ematch *, | |
239 | struct tcf_pkt_info *); | |
240 | void (*destroy)(struct tcf_proto *, | |
241 | struct tcf_ematch *); | |
242 | int (*dump)(struct sk_buff *, struct tcf_ematch *); | |
243 | struct module *owner; | |
244 | struct list_head link; | |
245 | }; | |
246 | ||
5c15257f JP |
247 | int tcf_em_register(struct tcf_ematch_ops *); |
248 | void tcf_em_unregister(struct tcf_ematch_ops *); | |
249 | int tcf_em_tree_validate(struct tcf_proto *, struct nlattr *, | |
250 | struct tcf_ematch_tree *); | |
251 | void tcf_em_tree_destroy(struct tcf_proto *, struct tcf_ematch_tree *); | |
252 | int tcf_em_tree_dump(struct sk_buff *, struct tcf_ematch_tree *, int); | |
253 | int __tcf_em_tree_match(struct sk_buff *, struct tcf_ematch_tree *, | |
254 | struct tcf_pkt_info *); | |
1da177e4 LT |
255 | |
256 | /** | |
257 | * tcf_em_tree_change - replace ematch tree of a running classifier | |
258 | * | |
259 | * @tp: classifier kind handle | |
260 | * @dst: destination ematch tree variable | |
261 | * @src: source ematch tree (temporary tree from tcf_em_tree_validate) | |
262 | * | |
263 | * This functions replaces the ematch tree in @dst with the ematch | |
264 | * tree in @src. The classifier in charge of the ematch tree may be | |
265 | * running. | |
266 | */ | |
267 | static inline void tcf_em_tree_change(struct tcf_proto *tp, | |
268 | struct tcf_ematch_tree *dst, | |
269 | struct tcf_ematch_tree *src) | |
270 | { | |
271 | tcf_tree_lock(tp); | |
272 | memcpy(dst, src, sizeof(*dst)); | |
273 | tcf_tree_unlock(tp); | |
274 | } | |
275 | ||
276 | /** | |
277 | * tcf_em_tree_match - evaulate an ematch tree | |
278 | * | |
279 | * @skb: socket buffer of the packet in question | |
280 | * @tree: ematch tree to be used for evaluation | |
281 | * @info: packet information examined by classifier | |
282 | * | |
283 | * This function matches @skb against the ematch tree in @tree by going | |
284 | * through all ematches respecting their logic relations returning | |
285 | * as soon as the result is obvious. | |
286 | * | |
287 | * Returns 1 if the ematch tree as-one matches, no ematches are configured | |
288 | * or ematch is not enabled in the kernel, otherwise 0 is returned. | |
289 | */ | |
290 | static inline int tcf_em_tree_match(struct sk_buff *skb, | |
291 | struct tcf_ematch_tree *tree, | |
292 | struct tcf_pkt_info *info) | |
293 | { | |
294 | if (tree->hdr.nmatches) | |
295 | return __tcf_em_tree_match(skb, tree, info); | |
296 | else | |
297 | return 1; | |
298 | } | |
299 | ||
db3d99c0 PM |
300 | #define MODULE_ALIAS_TCF_EMATCH(kind) MODULE_ALIAS("ematch-kind-" __stringify(kind)) |
301 | ||
1da177e4 LT |
302 | #else /* CONFIG_NET_EMATCH */ |
303 | ||
fd2c3ef7 | 304 | struct tcf_ematch_tree { |
1da177e4 LT |
305 | }; |
306 | ||
307 | #define tcf_em_tree_validate(tp, tb, t) ((void)(t), 0) | |
308 | #define tcf_em_tree_destroy(tp, t) do { (void)(t); } while(0) | |
309 | #define tcf_em_tree_dump(skb, t, tlv) (0) | |
310 | #define tcf_em_tree_change(tp, dst, src) do { } while(0) | |
311 | #define tcf_em_tree_match(skb, t, info) ((void)(info), 1) | |
312 | ||
313 | #endif /* CONFIG_NET_EMATCH */ | |
314 | ||
315 | static inline unsigned char * tcf_get_base_ptr(struct sk_buff *skb, int layer) | |
316 | { | |
317 | switch (layer) { | |
318 | case TCF_LAYER_LINK: | |
319 | return skb->data; | |
320 | case TCF_LAYER_NETWORK: | |
d56f90a7 | 321 | return skb_network_header(skb); |
1da177e4 | 322 | case TCF_LAYER_TRANSPORT: |
9c70220b | 323 | return skb_transport_header(skb); |
1da177e4 LT |
324 | } |
325 | ||
326 | return NULL; | |
327 | } | |
328 | ||
eddc9ec5 ACM |
329 | static inline int tcf_valid_offset(const struct sk_buff *skb, |
330 | const unsigned char *ptr, const int len) | |
1da177e4 | 331 | { |
da521b2c DM |
332 | return likely((ptr + len) <= skb_tail_pointer(skb) && |
333 | ptr >= skb->head && | |
334 | (ptr <= (ptr + len))); | |
1da177e4 LT |
335 | } |
336 | ||
337 | #ifdef CONFIG_NET_CLS_IND | |
0eeb8ffc DL |
338 | #include <net/net_namespace.h> |
339 | ||
1da177e4 | 340 | static inline int |
2519a602 | 341 | tcf_change_indev(struct net *net, struct nlattr *indev_tlv) |
1da177e4 | 342 | { |
2519a602 WC |
343 | char indev[IFNAMSIZ]; |
344 | struct net_device *dev; | |
345 | ||
add93b61 | 346 | if (nla_strlcpy(indev, indev_tlv, IFNAMSIZ) >= IFNAMSIZ) |
1da177e4 | 347 | return -EINVAL; |
2519a602 WC |
348 | dev = __dev_get_by_name(net, indev); |
349 | if (!dev) | |
350 | return -ENODEV; | |
351 | return dev->ifindex; | |
1da177e4 LT |
352 | } |
353 | ||
2519a602 WC |
354 | static inline bool |
355 | tcf_match_indev(struct sk_buff *skb, int ifindex) | |
1da177e4 | 356 | { |
2519a602 WC |
357 | if (!ifindex) |
358 | return true; | |
359 | if (!skb->skb_iif) | |
360 | return false; | |
361 | return ifindex == skb->skb_iif; | |
1da177e4 LT |
362 | } |
363 | #endif /* CONFIG_NET_CLS_IND */ | |
364 | ||
365 | #endif |