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 int stop; 12 int skip; 13 int count; 14 int (*fn)(struct tcf_proto *, unsigned long node, struct tcf_walker *); 15 }; 16 17 int register_tcf_proto_ops(struct tcf_proto_ops *ops); 18 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 63 struct 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 */ 72 struct 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 */ 84 static inline int 85 tcf_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 */ 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); 125 #endif 126 return 0; 127 } 128 129 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); 133 void tcf_exts_destroy(struct tcf_proto *tp, struct tcf_exts *exts); 134 void tcf_exts_change(struct tcf_proto *tp, struct tcf_exts *dst, 135 struct tcf_exts *src); 136 int tcf_exts_dump(struct sk_buff *skb, struct tcf_exts *exts, 137 const struct tcf_ext_map *map); 138 int tcf_exts_dump_stats(struct sk_buff *skb, struct tcf_exts *exts, 139 const struct tcf_ext_map *map); 140 141 /** 142 * struct tcf_pkt_info - packet information 143 */ 144 struct tcf_pkt_info { 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 */ 162 struct tcf_ematch { 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 */ 210 struct tcf_ematch_tree { 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 */ 228 struct tcf_ematch_ops { 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 int tcf_em_register(struct tcf_ematch_ops *); 243 void tcf_em_unregister(struct tcf_ematch_ops *); 244 int tcf_em_tree_validate(struct tcf_proto *, struct nlattr *, 245 struct tcf_ematch_tree *); 246 void tcf_em_tree_destroy(struct tcf_proto *, struct tcf_ematch_tree *); 247 int tcf_em_tree_dump(struct sk_buff *, struct tcf_ematch_tree *, int); 248 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 } 294 295 #define MODULE_ALIAS_TCF_EMATCH(kind) MODULE_ALIAS("ematch-kind-" __stringify(kind)) 296 297 #else /* CONFIG_NET_EMATCH */ 298 299 struct tcf_ematch_tree { 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: 316 return skb_network_header(skb); 317 case TCF_LAYER_TRANSPORT: 318 return skb_transport_header(skb); 319 } 320 321 return NULL; 322 } 323 324 static inline int tcf_valid_offset(const struct sk_buff *skb, 325 const unsigned char *ptr, const int len) 326 { 327 return likely((ptr + len) <= skb_tail_pointer(skb) && 328 ptr >= skb->head && 329 (ptr <= (ptr + len))); 330 } 331 332 #ifdef CONFIG_NET_CLS_IND 333 #include <net/net_namespace.h> 334 335 static inline int 336 tcf_change_indev(struct tcf_proto *tp, char *indev, struct nlattr *indev_tlv) 337 { 338 if (nla_strlcpy(indev, indev_tlv, IFNAMSIZ) >= IFNAMSIZ) 339 return -EINVAL; 340 return 0; 341 } 342 343 static inline int 344 tcf_match_indev(struct sk_buff *skb, char *indev) 345 { 346 struct net_device *dev; 347 348 if (indev[0]) { 349 if (!skb->skb_iif) 350 return 0; 351 dev = __dev_get_by_index(dev_net(skb->dev), skb->skb_iif); 352 if (!dev || strcmp(indev, dev->name)) 353 return 0; 354 } 355 356 return 1; 357 } 358 #endif /* CONFIG_NET_CLS_IND */ 359 360 #endif 361