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 10 struct 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 18 extern int register_tcf_proto_ops(struct tcf_proto_ops *ops); 19 extern int unregister_tcf_proto_ops(struct tcf_proto_ops *ops); 20 21 static 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 31 static inline unsigned long 32 cls_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 44 static inline void 45 tcf_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 55 static inline void 56 tcf_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 64 struct tcf_exts 65 { 66 #ifdef CONFIG_NET_CLS_ACT 67 struct tc_action *action; 68 #elif defined CONFIG_NET_CLS_POLICE 69 struct tcf_police *police; 70 #endif 71 }; 72 73 /* Map to export classifier specific extension TLV types to the 74 * generic extensions API. Unsupported extensions must be set to 0. 75 */ 76 struct tcf_ext_map 77 { 78 int action; 79 int police; 80 }; 81 82 /** 83 * tcf_exts_is_predicative - check if a predicative extension is present 84 * @exts: tc filter extensions handle 85 * 86 * Returns 1 if a predicative extension is present, i.e. an extension which 87 * might cause further actions and thus overrule the regular tcf_result. 88 */ 89 static inline int 90 tcf_exts_is_predicative(struct tcf_exts *exts) 91 { 92 #ifdef CONFIG_NET_CLS_ACT 93 return !!exts->action; 94 #elif defined CONFIG_NET_CLS_POLICE 95 return !!exts->police; 96 #else 97 return 0; 98 #endif 99 } 100 101 /** 102 * tcf_exts_is_available - check if at least one extension is present 103 * @exts: tc filter extensions handle 104 * 105 * Returns 1 if at least one extension is present. 106 */ 107 static inline int 108 tcf_exts_is_available(struct tcf_exts *exts) 109 { 110 /* All non-predicative extensions must be added here. */ 111 return tcf_exts_is_predicative(exts); 112 } 113 114 /** 115 * tcf_exts_exec - execute tc filter extensions 116 * @skb: socket buffer 117 * @exts: tc filter extensions handle 118 * @res: desired result 119 * 120 * Executes all configured extensions. Returns 0 on a normal execution, 121 * a negative number if the filter must be considered unmatched or 122 * a positive action code (TC_ACT_*) which must be returned to the 123 * underlying layer. 124 */ 125 static inline int 126 tcf_exts_exec(struct sk_buff *skb, struct tcf_exts *exts, 127 struct tcf_result *res) 128 { 129 #ifdef CONFIG_NET_CLS_ACT 130 if (exts->action) 131 return tcf_action_exec(skb, exts->action, res); 132 #elif defined CONFIG_NET_CLS_POLICE 133 if (exts->police) 134 return tcf_police(skb, exts->police); 135 #endif 136 137 return 0; 138 } 139 140 extern int tcf_exts_validate(struct tcf_proto *tp, struct rtattr **tb, 141 struct rtattr *rate_tlv, struct tcf_exts *exts, 142 struct tcf_ext_map *map); 143 extern void tcf_exts_destroy(struct tcf_proto *tp, struct tcf_exts *exts); 144 extern void tcf_exts_change(struct tcf_proto *tp, struct tcf_exts *dst, 145 struct tcf_exts *src); 146 extern int tcf_exts_dump(struct sk_buff *skb, struct tcf_exts *exts, 147 struct tcf_ext_map *map); 148 extern int tcf_exts_dump_stats(struct sk_buff *skb, struct tcf_exts *exts, 149 struct tcf_ext_map *map); 150 151 /** 152 * struct tcf_pkt_info - packet information 153 */ 154 struct tcf_pkt_info 155 { 156 unsigned char * ptr; 157 int nexthdr; 158 }; 159 160 #ifdef CONFIG_NET_EMATCH 161 162 struct tcf_ematch_ops; 163 164 /** 165 * struct tcf_ematch - extended match (ematch) 166 * 167 * @matchid: identifier to allow userspace to reidentify a match 168 * @flags: flags specifying attributes and the relation to other matches 169 * @ops: the operations lookup table of the corresponding ematch module 170 * @datalen: length of the ematch specific configuration data 171 * @data: ematch specific data 172 */ 173 struct tcf_ematch 174 { 175 struct tcf_ematch_ops * ops; 176 unsigned long data; 177 unsigned int datalen; 178 u16 matchid; 179 u16 flags; 180 }; 181 182 static inline int tcf_em_is_container(struct tcf_ematch *em) 183 { 184 return !em->ops; 185 } 186 187 static inline int tcf_em_is_simple(struct tcf_ematch *em) 188 { 189 return em->flags & TCF_EM_SIMPLE; 190 } 191 192 static inline int tcf_em_is_inverted(struct tcf_ematch *em) 193 { 194 return em->flags & TCF_EM_INVERT; 195 } 196 197 static inline int tcf_em_last_match(struct tcf_ematch *em) 198 { 199 return (em->flags & TCF_EM_REL_MASK) == TCF_EM_REL_END; 200 } 201 202 static inline int tcf_em_early_end(struct tcf_ematch *em, int result) 203 { 204 if (tcf_em_last_match(em)) 205 return 1; 206 207 if (result == 0 && em->flags & TCF_EM_REL_AND) 208 return 1; 209 210 if (result != 0 && em->flags & TCF_EM_REL_OR) 211 return 1; 212 213 return 0; 214 } 215 216 /** 217 * struct tcf_ematch_tree - ematch tree handle 218 * 219 * @hdr: ematch tree header supplied by userspace 220 * @matches: array of ematches 221 */ 222 struct tcf_ematch_tree 223 { 224 struct tcf_ematch_tree_hdr hdr; 225 struct tcf_ematch * matches; 226 227 }; 228 229 /** 230 * struct tcf_ematch_ops - ematch module operations 231 * 232 * @kind: identifier (kind) of this ematch module 233 * @datalen: length of expected configuration data (optional) 234 * @change: called during validation (optional) 235 * @match: called during ematch tree evaluation, must return 1/0 236 * @destroy: called during destroyage (optional) 237 * @dump: called during dumping process (optional) 238 * @owner: owner, must be set to THIS_MODULE 239 * @link: link to previous/next ematch module (internal use) 240 */ 241 struct tcf_ematch_ops 242 { 243 int kind; 244 int datalen; 245 int (*change)(struct tcf_proto *, void *, 246 int, struct tcf_ematch *); 247 int (*match)(struct sk_buff *, struct tcf_ematch *, 248 struct tcf_pkt_info *); 249 void (*destroy)(struct tcf_proto *, 250 struct tcf_ematch *); 251 int (*dump)(struct sk_buff *, struct tcf_ematch *); 252 struct module *owner; 253 struct list_head link; 254 }; 255 256 extern int tcf_em_register(struct tcf_ematch_ops *); 257 extern int tcf_em_unregister(struct tcf_ematch_ops *); 258 extern int tcf_em_tree_validate(struct tcf_proto *, struct rtattr *, 259 struct tcf_ematch_tree *); 260 extern void tcf_em_tree_destroy(struct tcf_proto *, struct tcf_ematch_tree *); 261 extern int tcf_em_tree_dump(struct sk_buff *, struct tcf_ematch_tree *, int); 262 extern int __tcf_em_tree_match(struct sk_buff *, struct tcf_ematch_tree *, 263 struct tcf_pkt_info *); 264 265 /** 266 * tcf_em_tree_change - replace ematch tree of a running classifier 267 * 268 * @tp: classifier kind handle 269 * @dst: destination ematch tree variable 270 * @src: source ematch tree (temporary tree from tcf_em_tree_validate) 271 * 272 * This functions replaces the ematch tree in @dst with the ematch 273 * tree in @src. The classifier in charge of the ematch tree may be 274 * running. 275 */ 276 static inline void tcf_em_tree_change(struct tcf_proto *tp, 277 struct tcf_ematch_tree *dst, 278 struct tcf_ematch_tree *src) 279 { 280 tcf_tree_lock(tp); 281 memcpy(dst, src, sizeof(*dst)); 282 tcf_tree_unlock(tp); 283 } 284 285 /** 286 * tcf_em_tree_match - evaulate an ematch tree 287 * 288 * @skb: socket buffer of the packet in question 289 * @tree: ematch tree to be used for evaluation 290 * @info: packet information examined by classifier 291 * 292 * This function matches @skb against the ematch tree in @tree by going 293 * through all ematches respecting their logic relations returning 294 * as soon as the result is obvious. 295 * 296 * Returns 1 if the ematch tree as-one matches, no ematches are configured 297 * or ematch is not enabled in the kernel, otherwise 0 is returned. 298 */ 299 static inline int tcf_em_tree_match(struct sk_buff *skb, 300 struct tcf_ematch_tree *tree, 301 struct tcf_pkt_info *info) 302 { 303 if (tree->hdr.nmatches) 304 return __tcf_em_tree_match(skb, tree, info); 305 else 306 return 1; 307 } 308 309 #else /* CONFIG_NET_EMATCH */ 310 311 struct tcf_ematch_tree 312 { 313 }; 314 315 #define tcf_em_tree_validate(tp, tb, t) ((void)(t), 0) 316 #define tcf_em_tree_destroy(tp, t) do { (void)(t); } while(0) 317 #define tcf_em_tree_dump(skb, t, tlv) (0) 318 #define tcf_em_tree_change(tp, dst, src) do { } while(0) 319 #define tcf_em_tree_match(skb, t, info) ((void)(info), 1) 320 321 #endif /* CONFIG_NET_EMATCH */ 322 323 static inline unsigned char * tcf_get_base_ptr(struct sk_buff *skb, int layer) 324 { 325 switch (layer) { 326 case TCF_LAYER_LINK: 327 return skb->data; 328 case TCF_LAYER_NETWORK: 329 return skb->nh.raw; 330 case TCF_LAYER_TRANSPORT: 331 return skb->h.raw; 332 } 333 334 return NULL; 335 } 336 337 static inline int tcf_valid_offset(struct sk_buff *skb, unsigned char *ptr, 338 int len) 339 { 340 return unlikely((ptr + len) < skb->tail && ptr > skb->head); 341 } 342 343 #ifdef CONFIG_NET_CLS_IND 344 static inline int 345 tcf_change_indev(struct tcf_proto *tp, char *indev, struct rtattr *indev_tlv) 346 { 347 if (rtattr_strlcpy(indev, indev_tlv, IFNAMSIZ) >= IFNAMSIZ) 348 return -EINVAL; 349 return 0; 350 } 351 352 static inline int 353 tcf_match_indev(struct sk_buff *skb, char *indev) 354 { 355 if (indev[0]) { 356 if (!skb->input_dev) 357 return 0; 358 if (strcmp(indev, skb->input_dev->name)) 359 return 0; 360 } 361 362 return 1; 363 } 364 #endif /* CONFIG_NET_CLS_IND */ 365 366 #endif 367