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 10struct 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 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 63struct 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 */ 72struct 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 */ 84static inline int 85tcf_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 */ 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); 125#endif 126 return 0; 127} 128 129extern int tcf_exts_validate(struct tcf_proto *tp, struct nlattr **tb, 130 struct nlattr *rate_tlv, struct tcf_exts *exts, 131 const struct tcf_ext_map *map); 132extern void tcf_exts_destroy(struct tcf_proto *tp, struct tcf_exts *exts); 133extern void tcf_exts_change(struct tcf_proto *tp, struct tcf_exts *dst, 134 struct tcf_exts *src); 135extern int tcf_exts_dump(struct sk_buff *skb, struct tcf_exts *exts, 136 const struct tcf_ext_map *map); 137extern int tcf_exts_dump_stats(struct sk_buff *skb, struct tcf_exts *exts, 138 const struct tcf_ext_map *map); 139 140/** 141 * struct tcf_pkt_info - packet information 142 */ 143struct tcf_pkt_info { 144 unsigned char * ptr; 145 int nexthdr; 146}; 147 148#ifdef CONFIG_NET_EMATCH 149 150struct tcf_ematch_ops; 151 152/** 153 * struct tcf_ematch - extended match (ematch) 154 * 155 * @matchid: identifier to allow userspace to reidentify a match 156 * @flags: flags specifying attributes and the relation to other matches 157 * @ops: the operations lookup table of the corresponding ematch module 158 * @datalen: length of the ematch specific configuration data 159 * @data: ematch specific data 160 */ 161struct tcf_ematch { 162 struct tcf_ematch_ops * ops; 163 unsigned long data; 164 unsigned int datalen; 165 u16 matchid; 166 u16 flags; 167}; 168 169static inline int tcf_em_is_container(struct tcf_ematch *em) 170{ 171 return !em->ops; 172} 173 174static inline int tcf_em_is_simple(struct tcf_ematch *em) 175{ 176 return em->flags & TCF_EM_SIMPLE; 177} 178 179static inline int tcf_em_is_inverted(struct tcf_ematch *em) 180{ 181 return em->flags & TCF_EM_INVERT; 182} 183 184static inline int tcf_em_last_match(struct tcf_ematch *em) 185{ 186 return (em->flags & TCF_EM_REL_MASK) == TCF_EM_REL_END; 187} 188 189static inline int tcf_em_early_end(struct tcf_ematch *em, int result) 190{ 191 if (tcf_em_last_match(em)) 192 return 1; 193 194 if (result == 0 && em->flags & TCF_EM_REL_AND) 195 return 1; 196 197 if (result != 0 && em->flags & TCF_EM_REL_OR) 198 return 1; 199 200 return 0; 201} 202 203/** 204 * struct tcf_ematch_tree - ematch tree handle 205 * 206 * @hdr: ematch tree header supplied by userspace 207 * @matches: array of ematches 208 */ 209struct tcf_ematch_tree { 210 struct tcf_ematch_tree_hdr hdr; 211 struct tcf_ematch * matches; 212 213}; 214 215/** 216 * struct tcf_ematch_ops - ematch module operations 217 * 218 * @kind: identifier (kind) of this ematch module 219 * @datalen: length of expected configuration data (optional) 220 * @change: called during validation (optional) 221 * @match: called during ematch tree evaluation, must return 1/0 222 * @destroy: called during destroyage (optional) 223 * @dump: called during dumping process (optional) 224 * @owner: owner, must be set to THIS_MODULE 225 * @link: link to previous/next ematch module (internal use) 226 */ 227struct tcf_ematch_ops { 228 int kind; 229 int datalen; 230 int (*change)(struct tcf_proto *, void *, 231 int, struct tcf_ematch *); 232 int (*match)(struct sk_buff *, struct tcf_ematch *, 233 struct tcf_pkt_info *); 234 void (*destroy)(struct tcf_proto *, 235 struct tcf_ematch *); 236 int (*dump)(struct sk_buff *, struct tcf_ematch *); 237 struct module *owner; 238 struct list_head link; 239}; 240 241extern int tcf_em_register(struct tcf_ematch_ops *); 242extern void tcf_em_unregister(struct tcf_ematch_ops *); 243extern int tcf_em_tree_validate(struct tcf_proto *, struct nlattr *, 244 struct tcf_ematch_tree *); 245extern void tcf_em_tree_destroy(struct tcf_proto *, struct tcf_ematch_tree *); 246extern int tcf_em_tree_dump(struct sk_buff *, struct tcf_ematch_tree *, int); 247extern int __tcf_em_tree_match(struct sk_buff *, struct tcf_ematch_tree *, 248 struct tcf_pkt_info *); 249 250/** 251 * tcf_em_tree_change - replace ematch tree of a running classifier 252 * 253 * @tp: classifier kind handle 254 * @dst: destination ematch tree variable 255 * @src: source ematch tree (temporary tree from tcf_em_tree_validate) 256 * 257 * This functions replaces the ematch tree in @dst with the ematch 258 * tree in @src. The classifier in charge of the ematch tree may be 259 * running. 260 */ 261static inline void tcf_em_tree_change(struct tcf_proto *tp, 262 struct tcf_ematch_tree *dst, 263 struct tcf_ematch_tree *src) 264{ 265 tcf_tree_lock(tp); 266 memcpy(dst, src, sizeof(*dst)); 267 tcf_tree_unlock(tp); 268} 269 270/** 271 * tcf_em_tree_match - evaulate an ematch tree 272 * 273 * @skb: socket buffer of the packet in question 274 * @tree: ematch tree to be used for evaluation 275 * @info: packet information examined by classifier 276 * 277 * This function matches @skb against the ematch tree in @tree by going 278 * through all ematches respecting their logic relations returning 279 * as soon as the result is obvious. 280 * 281 * Returns 1 if the ematch tree as-one matches, no ematches are configured 282 * or ematch is not enabled in the kernel, otherwise 0 is returned. 283 */ 284static inline int tcf_em_tree_match(struct sk_buff *skb, 285 struct tcf_ematch_tree *tree, 286 struct tcf_pkt_info *info) 287{ 288 if (tree->hdr.nmatches) 289 return __tcf_em_tree_match(skb, tree, info); 290 else 291 return 1; 292} 293 294#define MODULE_ALIAS_TCF_EMATCH(kind) MODULE_ALIAS("ematch-kind-" __stringify(kind)) 295 296#else /* CONFIG_NET_EMATCH */ 297 298struct tcf_ematch_tree { 299}; 300 301#define tcf_em_tree_validate(tp, tb, t) ((void)(t), 0) 302#define tcf_em_tree_destroy(tp, t) do { (void)(t); } while(0) 303#define tcf_em_tree_dump(skb, t, tlv) (0) 304#define tcf_em_tree_change(tp, dst, src) do { } while(0) 305#define tcf_em_tree_match(skb, t, info) ((void)(info), 1) 306 307#endif /* CONFIG_NET_EMATCH */ 308 309static inline unsigned char * tcf_get_base_ptr(struct sk_buff *skb, int layer) 310{ 311 switch (layer) { 312 case TCF_LAYER_LINK: 313 return skb->data; 314 case TCF_LAYER_NETWORK: 315 return skb_network_header(skb); 316 case TCF_LAYER_TRANSPORT: 317 return skb_transport_header(skb); 318 } 319 320 return NULL; 321} 322 323static inline int tcf_valid_offset(const struct sk_buff *skb, 324 const unsigned char *ptr, const int len) 325{ 326 return unlikely((ptr + len) < skb_tail_pointer(skb) && ptr > skb->head); 327} 328 329#ifdef CONFIG_NET_CLS_IND 330#include <net/net_namespace.h> 331 332static inline int 333tcf_change_indev(struct tcf_proto *tp, char *indev, struct nlattr *indev_tlv) 334{ 335 if (nla_strlcpy(indev, indev_tlv, IFNAMSIZ) >= IFNAMSIZ) 336 return -EINVAL; 337 return 0; 338} 339 340static inline int 341tcf_match_indev(struct sk_buff *skb, char *indev) 342{ 343 struct net_device *dev; 344 345 if (indev[0]) { 346 if (!skb->skb_iif) 347 return 0; 348 dev = __dev_get_by_index(dev_net(skb->dev), skb->skb_iif); 349 if (!dev || strcmp(indev, dev->name)) 350 return 0; 351 } 352 353 return 1; 354} 355#endif /* CONFIG_NET_CLS_IND */ 356 357#endif 358