linux/include/net/pkt_cls.h
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   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 likely((ptr + len) <= skb_tail_pointer(skb) &&
 327                      ptr >= skb->head &&
 328                      (ptr <= (ptr + len)));
 329}
 330
 331#ifdef CONFIG_NET_CLS_IND
 332#include <net/net_namespace.h>
 333
 334static inline int
 335tcf_change_indev(struct tcf_proto *tp, char *indev, struct nlattr *indev_tlv)
 336{
 337        if (nla_strlcpy(indev, indev_tlv, IFNAMSIZ) >= IFNAMSIZ)
 338                return -EINVAL;
 339        return 0;
 340}
 341
 342static inline int
 343tcf_match_indev(struct sk_buff *skb, char *indev)
 344{
 345        struct net_device *dev;
 346
 347        if (indev[0]) {
 348                if  (!skb->skb_iif)
 349                        return 0;
 350                dev = __dev_get_by_index(dev_net(skb->dev), skb->skb_iif);
 351                if (!dev || strcmp(indev, dev->name))
 352                        return 0;
 353        }
 354
 355        return 1;
 356}
 357#endif /* CONFIG_NET_CLS_IND */
 358
 359#endif
 360
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